1 /* Handle parameterized types (templates) for GNU -*- C++ -*-.
2 Copyright (C) 1992-2018 Free Software Foundation, Inc.
3 Written by Ken Raeburn (raeburn@cygnus.com) while at Watchmaker Computing.
4 Rewritten by Jason Merrill (jason@cygnus.com).
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3, or (at your option)
13 GCC is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
22 /* Known bugs or deficiencies include:
24 all methods must be provided in header files; can't use a source
25 file that contains only the method templates and "just win". */
29 #include "coretypes.h"
32 #include "stringpool.h"
35 #include "stor-layout.h"
37 #include "c-family/c-objc.h"
38 #include "cp-objcp-common.h"
40 #include "tree-iterator.h"
41 #include "type-utils.h"
43 #include "gcc-rich-location.h"
46 /* The type of functions taking a tree, and some additional data, and
48 typedef int (*tree_fn_t
) (tree
, void*);
50 /* The PENDING_TEMPLATES is a TREE_LIST of templates whose
51 instantiations have been deferred, either because their definitions
52 were not yet available, or because we were putting off doing the work. */
53 struct GTY ((chain_next ("%h.next"))) pending_template
{
54 struct pending_template
*next
;
55 struct tinst_level
*tinst
;
58 static GTY(()) struct pending_template
*pending_templates
;
59 static GTY(()) struct pending_template
*last_pending_template
;
61 int processing_template_parmlist
;
62 static int template_header_count
;
64 static GTY(()) tree saved_trees
;
65 static vec
<int> inline_parm_levels
;
67 static GTY(()) struct tinst_level
*current_tinst_level
;
69 static GTY(()) tree saved_access_scope
;
71 /* Live only within one (recursive) call to tsubst_expr. We use
72 this to pass the statement expression node from the STMT_EXPR
73 to the EXPR_STMT that is its result. */
74 static tree cur_stmt_expr
;
76 // -------------------------------------------------------------------------- //
77 // Local Specialization Stack
79 // Implementation of the RAII helper for creating new local
81 local_specialization_stack::local_specialization_stack (lss_policy policy
)
82 : saved (local_specializations
)
84 if (policy
== lss_blank
|| !saved
)
85 local_specializations
= new hash_map
<tree
, tree
>;
87 local_specializations
= new hash_map
<tree
, tree
>(*saved
);
90 local_specialization_stack::~local_specialization_stack ()
92 delete local_specializations
;
93 local_specializations
= saved
;
96 /* True if we've recursed into fn_type_unification too many times. */
97 static bool excessive_deduction_depth
;
99 struct GTY((for_user
)) spec_entry
106 struct spec_hasher
: ggc_ptr_hash
<spec_entry
>
108 static hashval_t
hash (spec_entry
*);
109 static bool equal (spec_entry
*, spec_entry
*);
112 static GTY (()) hash_table
<spec_hasher
> *decl_specializations
;
114 static GTY (()) hash_table
<spec_hasher
> *type_specializations
;
116 /* Contains canonical template parameter types. The vector is indexed by
117 the TEMPLATE_TYPE_IDX of the template parameter. Each element is a
118 TREE_LIST, whose TREE_VALUEs contain the canonical template
119 parameters of various types and levels. */
120 static GTY(()) vec
<tree
, va_gc
> *canonical_template_parms
;
122 #define UNIFY_ALLOW_NONE 0
123 #define UNIFY_ALLOW_MORE_CV_QUAL 1
124 #define UNIFY_ALLOW_LESS_CV_QUAL 2
125 #define UNIFY_ALLOW_DERIVED 4
126 #define UNIFY_ALLOW_INTEGER 8
127 #define UNIFY_ALLOW_OUTER_LEVEL 16
128 #define UNIFY_ALLOW_OUTER_MORE_CV_QUAL 32
129 #define UNIFY_ALLOW_OUTER_LESS_CV_QUAL 64
131 enum template_base_result
{
133 tbr_ambiguous_baseclass
,
137 static void push_access_scope (tree
);
138 static void pop_access_scope (tree
);
139 static bool resolve_overloaded_unification (tree
, tree
, tree
, tree
,
140 unification_kind_t
, int,
142 static int try_one_overload (tree
, tree
, tree
, tree
, tree
,
143 unification_kind_t
, int, bool, bool);
144 static int unify (tree
, tree
, tree
, tree
, int, bool);
145 static void add_pending_template (tree
);
146 static tree
reopen_tinst_level (struct tinst_level
*);
147 static tree
tsubst_initializer_list (tree
, tree
);
148 static tree
get_partial_spec_bindings (tree
, tree
, tree
);
149 static tree
coerce_template_parms (tree
, tree
, tree
, tsubst_flags_t
,
151 static tree
coerce_innermost_template_parms (tree
, tree
, tree
, tsubst_flags_t
,
153 static void tsubst_enum (tree
, tree
, tree
);
154 static tree
add_to_template_args (tree
, tree
);
155 static tree
add_outermost_template_args (tree
, tree
);
156 static bool check_instantiated_args (tree
, tree
, tsubst_flags_t
);
157 static int maybe_adjust_types_for_deduction (unification_kind_t
, tree
*, tree
*,
159 static int type_unification_real (tree
, tree
, tree
, const tree
*,
160 unsigned int, int, unification_kind_t
, int,
161 vec
<deferred_access_check
, va_gc
> **,
163 static void note_template_header (int);
164 static tree
convert_nontype_argument_function (tree
, tree
, tsubst_flags_t
);
165 static tree
convert_nontype_argument (tree
, tree
, tsubst_flags_t
);
166 static tree
convert_template_argument (tree
, tree
, tree
,
167 tsubst_flags_t
, int, tree
);
168 static tree
for_each_template_parm (tree
, tree_fn_t
, void*,
169 hash_set
<tree
> *, bool, tree_fn_t
= NULL
);
170 static tree
expand_template_argument_pack (tree
);
171 static tree
build_template_parm_index (int, int, int, tree
, tree
);
172 static bool inline_needs_template_parms (tree
, bool);
173 static void push_inline_template_parms_recursive (tree
, int);
174 static tree
reduce_template_parm_level (tree
, tree
, int, tree
, tsubst_flags_t
);
175 static int mark_template_parm (tree
, void *);
176 static int template_parm_this_level_p (tree
, void *);
177 static tree
tsubst_friend_function (tree
, tree
);
178 static tree
tsubst_friend_class (tree
, tree
);
179 static int can_complete_type_without_circularity (tree
);
180 static tree
get_bindings (tree
, tree
, tree
, bool);
181 static int template_decl_level (tree
);
182 static int check_cv_quals_for_unify (int, tree
, tree
);
183 static void template_parm_level_and_index (tree
, int*, int*);
184 static int unify_pack_expansion (tree
, tree
, tree
,
185 tree
, unification_kind_t
, bool, bool);
186 static tree
copy_template_args (tree
);
187 static tree
tsubst_template_arg (tree
, tree
, tsubst_flags_t
, tree
);
188 static tree
tsubst_template_args (tree
, tree
, tsubst_flags_t
, tree
);
189 static tree
tsubst_template_parms (tree
, tree
, tsubst_flags_t
);
190 static tree
most_specialized_partial_spec (tree
, tsubst_flags_t
);
191 static tree
tsubst_aggr_type (tree
, tree
, tsubst_flags_t
, tree
, int);
192 static tree
tsubst_arg_types (tree
, tree
, tree
, tsubst_flags_t
, tree
);
193 static tree
tsubst_function_type (tree
, tree
, tsubst_flags_t
, tree
);
194 static bool check_specialization_scope (void);
195 static tree
process_partial_specialization (tree
);
196 static void set_current_access_from_decl (tree
);
197 static enum template_base_result
get_template_base (tree
, tree
, tree
, tree
,
199 static tree
try_class_unification (tree
, tree
, tree
, tree
, bool);
200 static int coerce_template_template_parms (tree
, tree
, tsubst_flags_t
,
202 static bool template_template_parm_bindings_ok_p (tree
, tree
);
203 static void tsubst_default_arguments (tree
, tsubst_flags_t
);
204 static tree
for_each_template_parm_r (tree
*, int *, void *);
205 static tree
copy_default_args_to_explicit_spec_1 (tree
, tree
);
206 static void copy_default_args_to_explicit_spec (tree
);
207 static bool invalid_nontype_parm_type_p (tree
, tsubst_flags_t
);
208 static bool dependent_template_arg_p (tree
);
209 static bool any_template_arguments_need_structural_equality_p (tree
);
210 static bool dependent_type_p_r (tree
);
211 static tree
tsubst_copy (tree
, tree
, tsubst_flags_t
, tree
);
212 static tree
tsubst_decl (tree
, tree
, tsubst_flags_t
);
213 static void perform_typedefs_access_check (tree tmpl
, tree targs
);
214 static void append_type_to_template_for_access_check_1 (tree
, tree
, tree
,
216 static tree
listify (tree
);
217 static tree
listify_autos (tree
, tree
);
218 static tree
tsubst_template_parm (tree
, tree
, tsubst_flags_t
);
219 static tree
instantiate_alias_template (tree
, tree
, tsubst_flags_t
);
220 static bool complex_alias_template_p (const_tree tmpl
);
221 static tree
tsubst_attributes (tree
, tree
, tsubst_flags_t
, tree
);
222 static tree
canonicalize_expr_argument (tree
, tsubst_flags_t
);
223 static tree
make_argument_pack (tree
);
224 static void register_parameter_specializations (tree
, tree
);
225 static tree
enclosing_instantiation_of (tree tctx
);
227 /* Make the current scope suitable for access checking when we are
228 processing T. T can be FUNCTION_DECL for instantiated function
229 template, VAR_DECL for static member variable, or TYPE_DECL for
230 alias template (needed by instantiate_decl). */
233 push_access_scope (tree t
)
235 gcc_assert (VAR_OR_FUNCTION_DECL_P (t
)
236 || TREE_CODE (t
) == TYPE_DECL
);
238 if (DECL_FRIEND_CONTEXT (t
))
239 push_nested_class (DECL_FRIEND_CONTEXT (t
));
240 else if (DECL_CLASS_SCOPE_P (t
))
241 push_nested_class (DECL_CONTEXT (t
));
243 push_to_top_level ();
245 if (TREE_CODE (t
) == FUNCTION_DECL
)
247 saved_access_scope
= tree_cons
248 (NULL_TREE
, current_function_decl
, saved_access_scope
);
249 current_function_decl
= t
;
253 /* Restore the scope set up by push_access_scope. T is the node we
257 pop_access_scope (tree t
)
259 if (TREE_CODE (t
) == FUNCTION_DECL
)
261 current_function_decl
= TREE_VALUE (saved_access_scope
);
262 saved_access_scope
= TREE_CHAIN (saved_access_scope
);
265 if (DECL_FRIEND_CONTEXT (t
) || DECL_CLASS_SCOPE_P (t
))
268 pop_from_top_level ();
271 /* Do any processing required when DECL (a member template
272 declaration) is finished. Returns the TEMPLATE_DECL corresponding
273 to DECL, unless it is a specialization, in which case the DECL
274 itself is returned. */
277 finish_member_template_decl (tree decl
)
279 if (decl
== error_mark_node
)
280 return error_mark_node
;
282 gcc_assert (DECL_P (decl
));
284 if (TREE_CODE (decl
) == TYPE_DECL
)
288 type
= TREE_TYPE (decl
);
289 if (type
== error_mark_node
)
290 return error_mark_node
;
291 if (MAYBE_CLASS_TYPE_P (type
)
292 && CLASSTYPE_TEMPLATE_INFO (type
)
293 && !CLASSTYPE_TEMPLATE_SPECIALIZATION (type
))
295 tree tmpl
= CLASSTYPE_TI_TEMPLATE (type
);
296 check_member_template (tmpl
);
301 else if (TREE_CODE (decl
) == FIELD_DECL
)
302 error ("data member %qD cannot be a member template", decl
);
303 else if (DECL_TEMPLATE_INFO (decl
))
305 if (!DECL_TEMPLATE_SPECIALIZATION (decl
))
307 check_member_template (DECL_TI_TEMPLATE (decl
));
308 return DECL_TI_TEMPLATE (decl
);
314 error ("invalid member template declaration %qD", decl
);
316 return error_mark_node
;
319 /* Create a template info node. */
322 build_template_info (tree template_decl
, tree template_args
)
324 tree result
= make_node (TEMPLATE_INFO
);
325 TI_TEMPLATE (result
) = template_decl
;
326 TI_ARGS (result
) = template_args
;
330 /* Return the template info node corresponding to T, whatever T is. */
333 get_template_info (const_tree t
)
335 tree tinfo
= NULL_TREE
;
337 if (!t
|| t
== error_mark_node
)
340 if (TREE_CODE (t
) == NAMESPACE_DECL
341 || TREE_CODE (t
) == PARM_DECL
)
344 if (DECL_P (t
) && DECL_LANG_SPECIFIC (t
))
345 tinfo
= DECL_TEMPLATE_INFO (t
);
347 if (!tinfo
&& DECL_IMPLICIT_TYPEDEF_P (t
))
350 if (OVERLOAD_TYPE_P (t
))
351 tinfo
= TYPE_TEMPLATE_INFO (t
);
352 else if (TREE_CODE (t
) == BOUND_TEMPLATE_TEMPLATE_PARM
)
353 tinfo
= TEMPLATE_TEMPLATE_PARM_TEMPLATE_INFO (t
);
358 /* Returns the template nesting level of the indicated class TYPE.
368 A<T>::B<U> has depth two, while A<T> has depth one.
369 Both A<T>::B<int> and A<int>::B<U> have depth one, if
370 they are instantiations, not specializations.
372 This function is guaranteed to return 0 if passed NULL_TREE so
373 that, for example, `template_class_depth (current_class_type)' is
377 template_class_depth (tree type
)
381 for (depth
= 0; type
&& TREE_CODE (type
) != NAMESPACE_DECL
; )
383 tree tinfo
= get_template_info (type
);
385 if (tinfo
&& PRIMARY_TEMPLATE_P (TI_TEMPLATE (tinfo
))
386 && uses_template_parms (INNERMOST_TEMPLATE_ARGS (TI_ARGS (tinfo
))))
390 type
= CP_DECL_CONTEXT (type
);
391 else if (LAMBDA_TYPE_P (type
))
392 type
= LAMBDA_TYPE_EXTRA_SCOPE (type
);
394 type
= CP_TYPE_CONTEXT (type
);
400 /* Subroutine of maybe_begin_member_template_processing.
401 Returns true if processing DECL needs us to push template parms. */
404 inline_needs_template_parms (tree decl
, bool nsdmi
)
406 if (!decl
|| (!nsdmi
&& ! DECL_TEMPLATE_INFO (decl
)))
409 return (TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (most_general_template (decl
)))
410 > (processing_template_decl
+ DECL_TEMPLATE_SPECIALIZATION (decl
)));
413 /* Subroutine of maybe_begin_member_template_processing.
414 Push the template parms in PARMS, starting from LEVELS steps into the
415 chain, and ending at the beginning, since template parms are listed
419 push_inline_template_parms_recursive (tree parmlist
, int levels
)
421 tree parms
= TREE_VALUE (parmlist
);
425 push_inline_template_parms_recursive (TREE_CHAIN (parmlist
), levels
- 1);
427 ++processing_template_decl
;
428 current_template_parms
429 = tree_cons (size_int (processing_template_decl
),
430 parms
, current_template_parms
);
431 TEMPLATE_PARMS_FOR_INLINE (current_template_parms
) = 1;
433 begin_scope (TREE_VEC_LENGTH (parms
) ? sk_template_parms
: sk_template_spec
,
435 for (i
= 0; i
< TREE_VEC_LENGTH (parms
); ++i
)
437 tree parm
= TREE_VALUE (TREE_VEC_ELT (parms
, i
));
439 if (error_operand_p (parm
))
442 gcc_assert (DECL_P (parm
));
444 switch (TREE_CODE (parm
))
452 /* Push the CONST_DECL. */
453 pushdecl (TEMPLATE_PARM_DECL (DECL_INITIAL (parm
)));
462 /* Restore the template parameter context for a member template, a
463 friend template defined in a class definition, or a non-template
464 member of template class. */
467 maybe_begin_member_template_processing (tree decl
)
471 bool nsdmi
= TREE_CODE (decl
) == FIELD_DECL
;
475 tree ctx
= DECL_CONTEXT (decl
);
476 decl
= (CLASSTYPE_TEMPLATE_INFO (ctx
)
477 /* Disregard full specializations (c++/60999). */
478 && uses_template_parms (ctx
)
479 ? CLASSTYPE_TI_TEMPLATE (ctx
) : NULL_TREE
);
482 if (inline_needs_template_parms (decl
, nsdmi
))
484 parms
= DECL_TEMPLATE_PARMS (most_general_template (decl
));
485 levels
= TMPL_PARMS_DEPTH (parms
) - processing_template_decl
;
487 if (DECL_TEMPLATE_SPECIALIZATION (decl
))
490 parms
= TREE_CHAIN (parms
);
493 push_inline_template_parms_recursive (parms
, levels
);
496 /* Remember how many levels of template parameters we pushed so that
497 we can pop them later. */
498 inline_parm_levels
.safe_push (levels
);
501 /* Undo the effects of maybe_begin_member_template_processing. */
504 maybe_end_member_template_processing (void)
509 if (inline_parm_levels
.length () == 0)
512 last
= inline_parm_levels
.pop ();
513 for (i
= 0; i
< last
; ++i
)
515 --processing_template_decl
;
516 current_template_parms
= TREE_CHAIN (current_template_parms
);
521 /* Return a new template argument vector which contains all of ARGS,
522 but has as its innermost set of arguments the EXTRA_ARGS. */
525 add_to_template_args (tree args
, tree extra_args
)
532 if (args
== NULL_TREE
|| extra_args
== error_mark_node
)
535 extra_depth
= TMPL_ARGS_DEPTH (extra_args
);
536 new_args
= make_tree_vec (TMPL_ARGS_DEPTH (args
) + extra_depth
);
538 for (i
= 1; i
<= TMPL_ARGS_DEPTH (args
); ++i
)
539 SET_TMPL_ARGS_LEVEL (new_args
, i
, TMPL_ARGS_LEVEL (args
, i
));
541 for (j
= 1; j
<= extra_depth
; ++j
, ++i
)
542 SET_TMPL_ARGS_LEVEL (new_args
, i
, TMPL_ARGS_LEVEL (extra_args
, j
));
547 /* Like add_to_template_args, but only the outermost ARGS are added to
548 the EXTRA_ARGS. In particular, all but TMPL_ARGS_DEPTH
549 (EXTRA_ARGS) levels are added. This function is used to combine
550 the template arguments from a partial instantiation with the
551 template arguments used to attain the full instantiation from the
552 partial instantiation. */
555 add_outermost_template_args (tree args
, tree extra_args
)
559 /* If there are more levels of EXTRA_ARGS than there are ARGS,
560 something very fishy is going on. */
561 gcc_assert (TMPL_ARGS_DEPTH (args
) >= TMPL_ARGS_DEPTH (extra_args
));
563 /* If *all* the new arguments will be the EXTRA_ARGS, just return
565 if (TMPL_ARGS_DEPTH (args
) == TMPL_ARGS_DEPTH (extra_args
))
568 /* For the moment, we make ARGS look like it contains fewer levels. */
569 TREE_VEC_LENGTH (args
) -= TMPL_ARGS_DEPTH (extra_args
);
571 new_args
= add_to_template_args (args
, extra_args
);
573 /* Now, we restore ARGS to its full dimensions. */
574 TREE_VEC_LENGTH (args
) += TMPL_ARGS_DEPTH (extra_args
);
579 /* Return the N levels of innermost template arguments from the ARGS. */
582 get_innermost_template_args (tree args
, int n
)
590 /* If N is 1, just return the innermost set of template arguments. */
592 return TMPL_ARGS_LEVEL (args
, TMPL_ARGS_DEPTH (args
));
594 /* If we're not removing anything, just return the arguments we were
596 extra_levels
= TMPL_ARGS_DEPTH (args
) - n
;
597 gcc_assert (extra_levels
>= 0);
598 if (extra_levels
== 0)
601 /* Make a new set of arguments, not containing the outer arguments. */
602 new_args
= make_tree_vec (n
);
603 for (i
= 1; i
<= n
; ++i
)
604 SET_TMPL_ARGS_LEVEL (new_args
, i
,
605 TMPL_ARGS_LEVEL (args
, i
+ extra_levels
));
610 /* The inverse of get_innermost_template_args: Return all but the innermost
611 EXTRA_LEVELS levels of template arguments from the ARGS. */
614 strip_innermost_template_args (tree args
, int extra_levels
)
617 int n
= TMPL_ARGS_DEPTH (args
) - extra_levels
;
622 /* If N is 1, just return the outermost set of template arguments. */
624 return TMPL_ARGS_LEVEL (args
, 1);
626 /* If we're not removing anything, just return the arguments we were
628 gcc_assert (extra_levels
>= 0);
629 if (extra_levels
== 0)
632 /* Make a new set of arguments, not containing the inner arguments. */
633 new_args
= make_tree_vec (n
);
634 for (i
= 1; i
<= n
; ++i
)
635 SET_TMPL_ARGS_LEVEL (new_args
, i
,
636 TMPL_ARGS_LEVEL (args
, i
));
641 /* We've got a template header coming up; push to a new level for storing
645 begin_template_parm_list (void)
647 /* We use a non-tag-transparent scope here, which causes pushtag to
648 put tags in this scope, rather than in the enclosing class or
649 namespace scope. This is the right thing, since we want
650 TEMPLATE_DECLS, and not TYPE_DECLS for template classes. For a
651 global template class, push_template_decl handles putting the
652 TEMPLATE_DECL into top-level scope. For a nested template class,
655 template <class T> struct S1 {
656 template <class T> struct S2 {};
659 pushtag contains special code to insert the TEMPLATE_DECL for S2
660 at the right scope. */
661 begin_scope (sk_template_parms
, NULL
);
662 ++processing_template_decl
;
663 ++processing_template_parmlist
;
664 note_template_header (0);
666 /* Add a dummy parameter level while we process the parameter list. */
667 current_template_parms
668 = tree_cons (size_int (processing_template_decl
),
670 current_template_parms
);
673 /* This routine is called when a specialization is declared. If it is
674 invalid to declare a specialization here, an error is reported and
675 false is returned, otherwise this routine will return true. */
678 check_specialization_scope (void)
680 tree scope
= current_scope ();
684 An explicit specialization shall be declared in the namespace of
685 which the template is a member, or, for member templates, in the
686 namespace of which the enclosing class or enclosing class
687 template is a member. An explicit specialization of a member
688 function, member class or static data member of a class template
689 shall be declared in the namespace of which the class template
691 if (scope
&& TREE_CODE (scope
) != NAMESPACE_DECL
)
693 error ("explicit specialization in non-namespace scope %qD", scope
);
699 In an explicit specialization declaration for a member of a class
700 template or a member template that appears in namespace scope,
701 the member template and some of its enclosing class templates may
702 remain unspecialized, except that the declaration shall not
703 explicitly specialize a class member template if its enclosing
704 class templates are not explicitly specialized as well. */
705 if (current_template_parms
)
707 error ("enclosing class templates are not explicitly specialized");
714 /* We've just seen template <>. */
717 begin_specialization (void)
719 begin_scope (sk_template_spec
, NULL
);
720 note_template_header (1);
721 return check_specialization_scope ();
724 /* Called at then end of processing a declaration preceded by
728 end_specialization (void)
731 reset_specialization ();
734 /* Any template <>'s that we have seen thus far are not referring to a
735 function specialization. */
738 reset_specialization (void)
740 processing_specialization
= 0;
741 template_header_count
= 0;
744 /* We've just seen a template header. If SPECIALIZATION is nonzero,
745 it was of the form template <>. */
748 note_template_header (int specialization
)
750 processing_specialization
= specialization
;
751 template_header_count
++;
754 /* We're beginning an explicit instantiation. */
757 begin_explicit_instantiation (void)
759 gcc_assert (!processing_explicit_instantiation
);
760 processing_explicit_instantiation
= true;
765 end_explicit_instantiation (void)
767 gcc_assert (processing_explicit_instantiation
);
768 processing_explicit_instantiation
= false;
771 /* An explicit specialization or partial specialization of TMPL is being
772 declared. Check that the namespace in which the specialization is
773 occurring is permissible. Returns false iff it is invalid to
774 specialize TMPL in the current namespace. */
777 check_specialization_namespace (tree tmpl
)
779 tree tpl_ns
= decl_namespace_context (tmpl
);
783 An explicit specialization shall be declared in a namespace enclosing the
784 specialized template. An explicit specialization whose declarator-id is
785 not qualified shall be declared in the nearest enclosing namespace of the
786 template, or, if the namespace is inline (7.3.1), any namespace from its
787 enclosing namespace set. */
788 if (current_scope() != DECL_CONTEXT (tmpl
)
789 && !at_namespace_scope_p ())
791 error ("specialization of %qD must appear at namespace scope", tmpl
);
795 if (is_nested_namespace (current_namespace
, tpl_ns
, cxx_dialect
< cxx11
))
796 /* Same or enclosing namespace. */
800 permerror (input_location
,
801 "specialization of %qD in different namespace", tmpl
);
802 inform (DECL_SOURCE_LOCATION (tmpl
),
803 " from definition of %q#D", tmpl
);
808 /* SPEC is an explicit instantiation. Check that it is valid to
809 perform this explicit instantiation in the current namespace. */
812 check_explicit_instantiation_namespace (tree spec
)
816 /* DR 275: An explicit instantiation shall appear in an enclosing
817 namespace of its template. */
818 ns
= decl_namespace_context (spec
);
819 if (!is_nested_namespace (current_namespace
, ns
))
820 permerror (input_location
, "explicit instantiation of %qD in namespace %qD "
821 "(which does not enclose namespace %qD)",
822 spec
, current_namespace
, ns
);
825 // Returns the type of a template specialization only if that
826 // specialization needs to be defined. Otherwise (e.g., if the type has
827 // already been defined), the function returns NULL_TREE.
829 maybe_new_partial_specialization (tree type
)
831 // An implicit instantiation of an incomplete type implies
832 // the definition of a new class template.
834 // template<typename T>
837 // template<typename T>
840 // Here, S<T*> is an implicit instantiation of S whose type
842 if (CLASSTYPE_IMPLICIT_INSTANTIATION (type
) && !COMPLETE_TYPE_P (type
))
845 // It can also be the case that TYPE is a completed specialization.
846 // Continuing the previous example, suppose we also declare:
848 // template<typename T>
849 // requires Integral<T>
852 // Here, S<T*> refers to the specialization S<T*> defined
853 // above. However, we need to differentiate definitions because
854 // we intend to define a new partial specialization. In this case,
855 // we rely on the fact that the constraints are different for
856 // this declaration than that above.
858 // Note that we also get here for injected class names and
859 // late-parsed template definitions. We must ensure that we
860 // do not create new type declarations for those cases.
861 if (flag_concepts
&& CLASSTYPE_TEMPLATE_SPECIALIZATION (type
))
863 tree tmpl
= CLASSTYPE_TI_TEMPLATE (type
);
864 tree args
= CLASSTYPE_TI_ARGS (type
);
866 // If there are no template parameters, this cannot be a new
867 // partial template specializtion?
868 if (!current_template_parms
)
871 // The injected-class-name is not a new partial specialization.
872 if (DECL_SELF_REFERENCE_P (TYPE_NAME (type
)))
875 // If the constraints are not the same as those of the primary
876 // then, we can probably create a new specialization.
877 tree type_constr
= current_template_constraints ();
879 if (type
== TREE_TYPE (tmpl
))
881 tree main_constr
= get_constraints (tmpl
);
882 if (equivalent_constraints (type_constr
, main_constr
))
886 // Also, if there's a pre-existing specialization with matching
887 // constraints, then this also isn't new.
888 tree specs
= DECL_TEMPLATE_SPECIALIZATIONS (tmpl
);
891 tree spec_tmpl
= TREE_VALUE (specs
);
892 tree spec_args
= TREE_PURPOSE (specs
);
893 tree spec_constr
= get_constraints (spec_tmpl
);
894 if (comp_template_args (args
, spec_args
)
895 && equivalent_constraints (type_constr
, spec_constr
))
897 specs
= TREE_CHAIN (specs
);
900 // Create a new type node (and corresponding type decl)
901 // for the newly declared specialization.
902 tree t
= make_class_type (TREE_CODE (type
));
903 CLASSTYPE_DECLARED_CLASS (t
) = CLASSTYPE_DECLARED_CLASS (type
);
904 SET_TYPE_TEMPLATE_INFO (t
, build_template_info (tmpl
, args
));
906 /* We only need a separate type node for storing the definition of this
907 partial specialization; uses of S<T*> are unconstrained, so all are
908 equivalent. So keep TYPE_CANONICAL the same. */
909 TYPE_CANONICAL (t
) = TYPE_CANONICAL (type
);
911 // Build the corresponding type decl.
912 tree d
= create_implicit_typedef (DECL_NAME (tmpl
), t
);
913 DECL_CONTEXT (d
) = TYPE_CONTEXT (t
);
914 DECL_SOURCE_LOCATION (d
) = input_location
;
922 /* The TYPE is being declared. If it is a template type, that means it
923 is a partial specialization. Do appropriate error-checking. */
926 maybe_process_partial_specialization (tree type
)
930 if (type
== error_mark_node
)
931 return error_mark_node
;
933 /* A lambda that appears in specialization context is not itself a
935 if (CLASS_TYPE_P (type
) && CLASSTYPE_LAMBDA_EXPR (type
))
938 if (TREE_CODE (type
) == BOUND_TEMPLATE_TEMPLATE_PARM
)
940 error ("name of class shadows template template parameter %qD",
942 return error_mark_node
;
945 context
= TYPE_CONTEXT (type
);
947 if (TYPE_ALIAS_P (type
))
949 tree tinfo
= TYPE_ALIAS_TEMPLATE_INFO (type
);
951 if (tinfo
&& DECL_ALIAS_TEMPLATE_P (TI_TEMPLATE (tinfo
)))
952 error ("specialization of alias template %qD",
953 TI_TEMPLATE (tinfo
));
955 error ("explicit specialization of non-template %qT", type
);
956 return error_mark_node
;
958 else if (CLASS_TYPE_P (type
) && CLASSTYPE_USE_TEMPLATE (type
))
960 /* This is for ordinary explicit specialization and partial
961 specialization of a template class such as:
963 template <> class C<int>;
967 template <class T> class C<T*>;
969 Make sure that `C<int>' and `C<T*>' are implicit instantiations. */
971 if (tree t
= maybe_new_partial_specialization (type
))
973 if (!check_specialization_namespace (CLASSTYPE_TI_TEMPLATE (t
))
974 && !at_namespace_scope_p ())
975 return error_mark_node
;
976 SET_CLASSTYPE_TEMPLATE_SPECIALIZATION (t
);
977 DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (t
)) = input_location
;
978 if (processing_template_decl
)
980 tree decl
= push_template_decl (TYPE_MAIN_DECL (t
));
981 if (decl
== error_mark_node
)
982 return error_mark_node
;
983 return TREE_TYPE (decl
);
986 else if (CLASSTYPE_TEMPLATE_INSTANTIATION (type
))
987 error ("specialization of %qT after instantiation", type
);
988 else if (errorcount
&& !processing_specialization
989 && CLASSTYPE_TEMPLATE_SPECIALIZATION (type
)
990 && !uses_template_parms (CLASSTYPE_TI_ARGS (type
)))
991 /* Trying to define a specialization either without a template<> header
992 or in an inappropriate place. We've already given an error, so just
993 bail now so we don't actually define the specialization. */
994 return error_mark_node
;
996 else if (CLASS_TYPE_P (type
)
997 && !CLASSTYPE_USE_TEMPLATE (type
)
998 && CLASSTYPE_TEMPLATE_INFO (type
)
999 && context
&& CLASS_TYPE_P (context
)
1000 && CLASSTYPE_TEMPLATE_INFO (context
))
1002 /* This is for an explicit specialization of member class
1003 template according to [temp.expl.spec/18]:
1005 template <> template <class U> class C<int>::D;
1007 The context `C<int>' must be an implicit instantiation.
1008 Otherwise this is just a member class template declared
1011 template <> class C<int> { template <class U> class D; };
1012 template <> template <class U> class C<int>::D;
1014 In the first case, `C<int>::D' is a specialization of `C<T>::D'
1015 while in the second case, `C<int>::D' is a primary template
1016 and `C<T>::D' may not exist. */
1018 if (CLASSTYPE_IMPLICIT_INSTANTIATION (context
)
1019 && !COMPLETE_TYPE_P (type
))
1022 tree tmpl
= CLASSTYPE_TI_TEMPLATE (type
);
1024 if (current_namespace
1025 != decl_namespace_context (tmpl
))
1027 permerror (input_location
,
1028 "specializing %q#T in different namespace", type
);
1029 permerror (DECL_SOURCE_LOCATION (tmpl
),
1030 " from definition of %q#D", tmpl
);
1033 /* Check for invalid specialization after instantiation:
1035 template <> template <> class C<int>::D<int>;
1036 template <> template <class U> class C<int>::D; */
1038 for (t
= DECL_TEMPLATE_INSTANTIATIONS (tmpl
);
1039 t
; t
= TREE_CHAIN (t
))
1041 tree inst
= TREE_VALUE (t
);
1042 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (inst
)
1043 || !COMPLETE_OR_OPEN_TYPE_P (inst
))
1045 /* We already have a full specialization of this partial
1046 instantiation, or a full specialization has been
1047 looked up but not instantiated. Reassign it to the
1048 new member specialization template. */
1052 elt
.tmpl
= most_general_template (tmpl
);
1053 elt
.args
= CLASSTYPE_TI_ARGS (inst
);
1056 type_specializations
->remove_elt (&elt
);
1059 elt
.args
= INNERMOST_TEMPLATE_ARGS (elt
.args
);
1062 = type_specializations
->find_slot (&elt
, INSERT
);
1063 entry
= ggc_alloc
<spec_entry
> ();
1068 /* But if we've had an implicit instantiation, that's a
1069 problem ([temp.expl.spec]/6). */
1070 error ("specialization %qT after instantiation %qT",
1074 /* Mark TYPE as a specialization. And as a result, we only
1075 have one level of template argument for the innermost
1077 SET_CLASSTYPE_TEMPLATE_SPECIALIZATION (type
);
1078 DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (type
)) = input_location
;
1079 CLASSTYPE_TI_ARGS (type
)
1080 = INNERMOST_TEMPLATE_ARGS (CLASSTYPE_TI_ARGS (type
));
1083 else if (processing_specialization
)
1085 /* Someday C++0x may allow for enum template specialization. */
1086 if (cxx_dialect
> cxx98
&& TREE_CODE (type
) == ENUMERAL_TYPE
1087 && CLASS_TYPE_P (context
) && CLASSTYPE_USE_TEMPLATE (context
))
1088 pedwarn (input_location
, OPT_Wpedantic
, "template specialization "
1089 "of %qD not allowed by ISO C++", type
);
1092 error ("explicit specialization of non-template %qT", type
);
1093 return error_mark_node
;
1100 /* Returns nonzero if we can optimize the retrieval of specializations
1101 for TMPL, a TEMPLATE_DECL. In particular, for such a template, we
1102 do not use DECL_TEMPLATE_SPECIALIZATIONS at all. */
1105 optimize_specialization_lookup_p (tree tmpl
)
1107 return (DECL_FUNCTION_TEMPLATE_P (tmpl
)
1108 && DECL_CLASS_SCOPE_P (tmpl
)
1109 /* DECL_CLASS_SCOPE_P holds of T::f even if T is a template
1111 && CLASS_TYPE_P (DECL_CONTEXT (tmpl
))
1112 /* The optimized lookup depends on the fact that the
1113 template arguments for the member function template apply
1114 purely to the containing class, which is not true if the
1115 containing class is an explicit or partial
1117 && !CLASSTYPE_TEMPLATE_SPECIALIZATION (DECL_CONTEXT (tmpl
))
1118 && !DECL_MEMBER_TEMPLATE_P (tmpl
)
1119 && !DECL_CONV_FN_P (tmpl
)
1120 /* It is possible to have a template that is not a member
1121 template and is not a member of a template class:
1123 template <typename T>
1124 struct S { friend A::f(); };
1126 Here, the friend function is a template, but the context does
1127 not have template information. The optimized lookup relies
1128 on having ARGS be the template arguments for both the class
1129 and the function template. */
1130 && !DECL_FRIEND_P (DECL_TEMPLATE_RESULT (tmpl
)));
1133 /* Make sure ARGS doesn't use any inappropriate typedefs; we should have
1134 gone through coerce_template_parms by now. */
1137 verify_unstripped_args_1 (tree inner
)
1139 for (int i
= 0; i
< TREE_VEC_LENGTH (inner
); ++i
)
1141 tree arg
= TREE_VEC_ELT (inner
, i
);
1142 if (TREE_CODE (arg
) == TEMPLATE_DECL
)
1144 else if (TYPE_P (arg
))
1145 gcc_assert (strip_typedefs (arg
, NULL
) == arg
);
1146 else if (ARGUMENT_PACK_P (arg
))
1147 verify_unstripped_args_1 (ARGUMENT_PACK_ARGS (arg
));
1148 else if (strip_typedefs (TREE_TYPE (arg
), NULL
) != TREE_TYPE (arg
))
1149 /* Allow typedefs on the type of a non-type argument, since a
1150 parameter can have them. */;
1152 gcc_assert (strip_typedefs_expr (arg
, NULL
) == arg
);
1157 verify_unstripped_args (tree args
)
1159 ++processing_template_decl
;
1160 if (!any_dependent_template_arguments_p (args
))
1161 verify_unstripped_args_1 (INNERMOST_TEMPLATE_ARGS (args
));
1162 --processing_template_decl
;
1165 /* Retrieve the specialization (in the sense of [temp.spec] - a
1166 specialization is either an instantiation or an explicit
1167 specialization) of TMPL for the given template ARGS. If there is
1168 no such specialization, return NULL_TREE. The ARGS are a vector of
1169 arguments, or a vector of vectors of arguments, in the case of
1170 templates with more than one level of parameters.
1172 If TMPL is a type template and CLASS_SPECIALIZATIONS_P is true,
1173 then we search for a partial specialization matching ARGS. This
1174 parameter is ignored if TMPL is not a class template.
1176 We can also look up a FIELD_DECL, if it is a lambda capture pack; the
1177 result is a NONTYPE_ARGUMENT_PACK. */
1180 retrieve_specialization (tree tmpl
, tree args
, hashval_t hash
)
1182 if (tmpl
== NULL_TREE
)
1185 if (args
== error_mark_node
)
1188 gcc_assert (TREE_CODE (tmpl
) == TEMPLATE_DECL
1189 || TREE_CODE (tmpl
) == FIELD_DECL
);
1191 /* There should be as many levels of arguments as there are
1192 levels of parameters. */
1193 gcc_assert (TMPL_ARGS_DEPTH (args
)
1194 == (TREE_CODE (tmpl
) == TEMPLATE_DECL
1195 ? TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (tmpl
))
1196 : template_class_depth (DECL_CONTEXT (tmpl
))));
1199 verify_unstripped_args (args
);
1201 /* Lambda functions in templates aren't instantiated normally, but through
1202 tsubst_lambda_expr. */
1203 if (lambda_fn_in_template_p (tmpl
))
1206 if (optimize_specialization_lookup_p (tmpl
))
1208 /* The template arguments actually apply to the containing
1209 class. Find the class specialization with those
1211 tree class_template
= CLASSTYPE_TI_TEMPLATE (DECL_CONTEXT (tmpl
));
1212 tree class_specialization
1213 = retrieve_specialization (class_template
, args
, 0);
1214 if (!class_specialization
)
1217 /* Find the instance of TMPL. */
1218 tree fns
= get_class_binding (class_specialization
, DECL_NAME (tmpl
));
1219 for (ovl_iterator
iter (fns
); iter
; ++iter
)
1222 if (DECL_TEMPLATE_INFO (fn
) && DECL_TI_TEMPLATE (fn
) == tmpl
1223 /* using-declarations can add base methods to the method vec,
1224 and we don't want those here. */
1225 && DECL_CONTEXT (fn
) == class_specialization
)
1234 hash_table
<spec_hasher
> *specializations
;
1238 elt
.spec
= NULL_TREE
;
1240 if (DECL_CLASS_TEMPLATE_P (tmpl
))
1241 specializations
= type_specializations
;
1243 specializations
= decl_specializations
;
1246 hash
= spec_hasher::hash (&elt
);
1247 found
= specializations
->find_with_hash (&elt
, hash
);
1255 /* Like retrieve_specialization, but for local declarations. */
1258 retrieve_local_specialization (tree tmpl
)
1260 if (local_specializations
== NULL
)
1263 tree
*slot
= local_specializations
->get (tmpl
);
1264 return slot
? *slot
: NULL_TREE
;
1267 /* Returns nonzero iff DECL is a specialization of TMPL. */
1270 is_specialization_of (tree decl
, tree tmpl
)
1274 if (TREE_CODE (decl
) == FUNCTION_DECL
)
1278 t
= DECL_TEMPLATE_INFO (t
) ? DECL_TI_TEMPLATE (t
) : NULL_TREE
)
1284 gcc_assert (TREE_CODE (decl
) == TYPE_DECL
);
1286 for (t
= TREE_TYPE (decl
);
1288 t
= CLASSTYPE_USE_TEMPLATE (t
)
1289 ? TREE_TYPE (CLASSTYPE_TI_TEMPLATE (t
)) : NULL_TREE
)
1290 if (same_type_ignoring_top_level_qualifiers_p (t
, TREE_TYPE (tmpl
)))
1297 /* Returns nonzero iff DECL is a specialization of friend declaration
1298 FRIEND_DECL according to [temp.friend]. */
1301 is_specialization_of_friend (tree decl
, tree friend_decl
)
1303 bool need_template
= true;
1306 gcc_assert (TREE_CODE (decl
) == FUNCTION_DECL
1307 || TREE_CODE (decl
) == TYPE_DECL
);
1309 /* For [temp.friend/6] when FRIEND_DECL is an ordinary member function
1310 of a template class, we want to check if DECL is a specialization
1312 if (TREE_CODE (friend_decl
) == FUNCTION_DECL
1313 && DECL_TEMPLATE_INFO (friend_decl
)
1314 && !DECL_USE_TEMPLATE (friend_decl
))
1316 /* We want a TEMPLATE_DECL for `is_specialization_of'. */
1317 friend_decl
= DECL_TI_TEMPLATE (friend_decl
);
1318 need_template
= false;
1320 else if (TREE_CODE (friend_decl
) == TEMPLATE_DECL
1321 && !PRIMARY_TEMPLATE_P (friend_decl
))
1322 need_template
= false;
1324 /* There is nothing to do if this is not a template friend. */
1325 if (TREE_CODE (friend_decl
) != TEMPLATE_DECL
)
1328 if (is_specialization_of (decl
, friend_decl
))
1332 A member of a class template may be declared to be a friend of a
1333 non-template class. In this case, the corresponding member of
1334 every specialization of the class template is a friend of the
1335 class granting friendship.
1337 For example, given a template friend declaration
1339 template <class T> friend void A<T>::f();
1341 the member function below is considered a friend
1343 template <> struct A<int> {
1347 For this type of template friend, TEMPLATE_DEPTH below will be
1348 nonzero. To determine if DECL is a friend of FRIEND, we first
1349 check if the enclosing class is a specialization of another. */
1351 template_depth
= template_class_depth (CP_DECL_CONTEXT (friend_decl
));
1353 && DECL_CLASS_SCOPE_P (decl
)
1354 && is_specialization_of (TYPE_NAME (DECL_CONTEXT (decl
)),
1355 CLASSTYPE_TI_TEMPLATE (DECL_CONTEXT (friend_decl
))))
1357 /* Next, we check the members themselves. In order to handle
1358 a few tricky cases, such as when FRIEND_DECL's are
1360 template <class T> friend void A<T>::g(T t);
1361 template <class T> template <T t> friend void A<T>::h();
1365 void A<int>::g(int);
1366 template <int> void A<int>::h();
1368 we need to figure out ARGS, the template arguments from
1369 the context of DECL. This is required for template substitution
1370 of `T' in the function parameter of `g' and template parameter
1371 of `h' in the above examples. Here ARGS corresponds to `int'. */
1373 tree context
= DECL_CONTEXT (decl
);
1374 tree args
= NULL_TREE
;
1375 int current_depth
= 0;
1377 while (current_depth
< template_depth
)
1379 if (CLASSTYPE_TEMPLATE_INFO (context
))
1381 if (current_depth
== 0)
1382 args
= TYPE_TI_ARGS (context
);
1384 args
= add_to_template_args (TYPE_TI_ARGS (context
), args
);
1387 context
= TYPE_CONTEXT (context
);
1390 if (TREE_CODE (decl
) == FUNCTION_DECL
)
1395 tree friend_args_type
;
1396 tree decl_args_type
;
1398 /* Make sure that both DECL and FRIEND_DECL are templates or
1400 is_template
= DECL_TEMPLATE_INFO (decl
)
1401 && PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl
));
1402 if (need_template
^ is_template
)
1404 else if (is_template
)
1406 /* If both are templates, check template parameter list. */
1408 = tsubst_template_parms (DECL_TEMPLATE_PARMS (friend_decl
),
1410 if (!comp_template_parms
1411 (DECL_TEMPLATE_PARMS (DECL_TI_TEMPLATE (decl
)),
1415 decl_type
= TREE_TYPE (DECL_TI_TEMPLATE (decl
));
1418 decl_type
= TREE_TYPE (decl
);
1420 friend_type
= tsubst_function_type (TREE_TYPE (friend_decl
), args
,
1421 tf_none
, NULL_TREE
);
1422 if (friend_type
== error_mark_node
)
1425 /* Check if return types match. */
1426 if (!same_type_p (TREE_TYPE (decl_type
), TREE_TYPE (friend_type
)))
1429 /* Check if function parameter types match, ignoring the
1430 `this' parameter. */
1431 friend_args_type
= TYPE_ARG_TYPES (friend_type
);
1432 decl_args_type
= TYPE_ARG_TYPES (decl_type
);
1433 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (friend_decl
))
1434 friend_args_type
= TREE_CHAIN (friend_args_type
);
1435 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (decl
))
1436 decl_args_type
= TREE_CHAIN (decl_args_type
);
1438 return compparms (decl_args_type
, friend_args_type
);
1442 /* DECL is a TYPE_DECL */
1444 tree decl_type
= TREE_TYPE (decl
);
1446 /* Make sure that both DECL and FRIEND_DECL are templates or
1449 = CLASSTYPE_TEMPLATE_INFO (decl_type
)
1450 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (decl_type
));
1452 if (need_template
^ is_template
)
1454 else if (is_template
)
1457 /* If both are templates, check the name of the two
1458 TEMPLATE_DECL's first because is_friend didn't. */
1459 if (DECL_NAME (CLASSTYPE_TI_TEMPLATE (decl_type
))
1460 != DECL_NAME (friend_decl
))
1463 /* Now check template parameter list. */
1465 = tsubst_template_parms (DECL_TEMPLATE_PARMS (friend_decl
),
1467 return comp_template_parms
1468 (DECL_TEMPLATE_PARMS (CLASSTYPE_TI_TEMPLATE (decl_type
)),
1472 return (DECL_NAME (decl
)
1473 == DECL_NAME (friend_decl
));
1479 /* Register the specialization SPEC as a specialization of TMPL with
1480 the indicated ARGS. IS_FRIEND indicates whether the specialization
1481 is actually just a friend declaration. ATTRLIST is the list of
1482 attributes that the specialization is declared with or NULL when
1483 it isn't. Returns SPEC, or an equivalent prior declaration, if
1486 We also store instantiations of field packs in the hash table, even
1487 though they are not themselves templates, to make lookup easier. */
1490 register_specialization (tree spec
, tree tmpl
, tree args
, bool is_friend
,
1494 spec_entry
**slot
= NULL
;
1497 gcc_assert ((TREE_CODE (tmpl
) == TEMPLATE_DECL
&& DECL_P (spec
))
1498 || (TREE_CODE (tmpl
) == FIELD_DECL
1499 && TREE_CODE (spec
) == NONTYPE_ARGUMENT_PACK
));
1501 if (TREE_CODE (spec
) == FUNCTION_DECL
1502 && uses_template_parms (DECL_TI_ARGS (spec
)))
1503 /* This is the FUNCTION_DECL for a partial instantiation. Don't
1504 register it; we want the corresponding TEMPLATE_DECL instead.
1505 We use `uses_template_parms (DECL_TI_ARGS (spec))' rather than
1506 the more obvious `uses_template_parms (spec)' to avoid problems
1507 with default function arguments. In particular, given
1508 something like this:
1510 template <class T> void f(T t1, T t = T())
1512 the default argument expression is not substituted for in an
1513 instantiation unless and until it is actually needed. */
1516 if (optimize_specialization_lookup_p (tmpl
))
1517 /* We don't put these specializations in the hash table, but we might
1518 want to give an error about a mismatch. */
1519 fn
= retrieve_specialization (tmpl
, args
, 0);
1527 hash
= spec_hasher::hash (&elt
);
1530 decl_specializations
->find_slot_with_hash (&elt
, hash
, INSERT
);
1532 fn
= ((spec_entry
*) *slot
)->spec
;
1537 /* We can sometimes try to re-register a specialization that we've
1538 already got. In particular, regenerate_decl_from_template calls
1539 duplicate_decls which will update the specialization list. But,
1540 we'll still get called again here anyhow. It's more convenient
1541 to simply allow this than to try to prevent it. */
1544 else if (fn
&& DECL_TEMPLATE_SPECIALIZATION (spec
))
1546 if (DECL_TEMPLATE_INSTANTIATION (fn
))
1548 if (DECL_ODR_USED (fn
)
1549 || DECL_EXPLICIT_INSTANTIATION (fn
))
1551 error ("specialization of %qD after instantiation",
1553 return error_mark_node
;
1558 /* This situation should occur only if the first
1559 specialization is an implicit instantiation, the
1560 second is an explicit specialization, and the
1561 implicit instantiation has not yet been used. That
1562 situation can occur if we have implicitly
1563 instantiated a member function and then specialized
1566 We can also wind up here if a friend declaration that
1567 looked like an instantiation turns out to be a
1570 template <class T> void foo(T);
1571 class S { friend void foo<>(int) };
1572 template <> void foo(int);
1574 We transform the existing DECL in place so that any
1575 pointers to it become pointers to the updated
1578 If there was a definition for the template, but not
1579 for the specialization, we want this to look as if
1580 there were no definition, and vice versa. */
1581 DECL_INITIAL (fn
) = NULL_TREE
;
1582 duplicate_decls (spec
, fn
, is_friend
);
1583 /* The call to duplicate_decls will have applied
1586 An explicit specialization of a function template
1587 is inline only if it is explicitly declared to be,
1588 and independently of whether its function template
1591 to the primary function; now copy the inline bits to
1592 the various clones. */
1593 FOR_EACH_CLONE (clone
, fn
)
1595 DECL_DECLARED_INLINE_P (clone
)
1596 = DECL_DECLARED_INLINE_P (fn
);
1597 DECL_SOURCE_LOCATION (clone
)
1598 = DECL_SOURCE_LOCATION (fn
);
1599 DECL_DELETED_FN (clone
)
1600 = DECL_DELETED_FN (fn
);
1602 check_specialization_namespace (tmpl
);
1607 else if (DECL_TEMPLATE_SPECIALIZATION (fn
))
1609 tree dd
= duplicate_decls (spec
, fn
, is_friend
);
1610 if (dd
== error_mark_node
)
1611 /* We've already complained in duplicate_decls. */
1612 return error_mark_node
;
1614 if (dd
== NULL_TREE
&& DECL_INITIAL (spec
))
1615 /* Dup decl failed, but this is a new definition. Set the
1616 line number so any errors match this new
1618 DECL_SOURCE_LOCATION (fn
) = DECL_SOURCE_LOCATION (spec
);
1624 return duplicate_decls (spec
, fn
, is_friend
);
1626 /* A specialization must be declared in the same namespace as the
1627 template it is specializing. */
1628 if (DECL_P (spec
) && DECL_TEMPLATE_SPECIALIZATION (spec
)
1629 && !check_specialization_namespace (tmpl
))
1630 DECL_CONTEXT (spec
) = DECL_CONTEXT (tmpl
);
1632 if (slot
!= NULL
/* !optimize_specialization_lookup_p (tmpl) */)
1634 spec_entry
*entry
= ggc_alloc
<spec_entry
> ();
1635 gcc_assert (tmpl
&& args
&& spec
);
1638 if ((TREE_CODE (spec
) == FUNCTION_DECL
&& DECL_NAMESPACE_SCOPE_P (spec
)
1639 && PRIMARY_TEMPLATE_P (tmpl
)
1640 && DECL_SAVED_TREE (DECL_TEMPLATE_RESULT (tmpl
)) == NULL_TREE
)
1641 || variable_template_p (tmpl
))
1642 /* If TMPL is a forward declaration of a template function, keep a list
1643 of all specializations in case we need to reassign them to a friend
1644 template later in tsubst_friend_function.
1646 Also keep a list of all variable template instantiations so that
1647 process_partial_specialization can check whether a later partial
1648 specialization would have used it. */
1649 DECL_TEMPLATE_INSTANTIATIONS (tmpl
)
1650 = tree_cons (args
, spec
, DECL_TEMPLATE_INSTANTIATIONS (tmpl
));
1656 /* Returns true iff two spec_entry nodes are equivalent. */
1658 int comparing_specializations
;
1661 spec_hasher::equal (spec_entry
*e1
, spec_entry
*e2
)
1665 ++comparing_specializations
;
1666 equal
= (e1
->tmpl
== e2
->tmpl
1667 && comp_template_args (e1
->args
, e2
->args
));
1668 if (equal
&& flag_concepts
1669 /* tmpl could be a FIELD_DECL for a capture pack. */
1670 && TREE_CODE (e1
->tmpl
) == TEMPLATE_DECL
1671 && VAR_P (DECL_TEMPLATE_RESULT (e1
->tmpl
))
1672 && uses_template_parms (e1
->args
))
1674 /* Partial specializations of a variable template can be distinguished by
1676 tree c1
= e1
->spec
? get_constraints (e1
->spec
) : NULL_TREE
;
1677 tree c2
= e2
->spec
? get_constraints (e2
->spec
) : NULL_TREE
;
1678 equal
= equivalent_constraints (c1
, c2
);
1680 --comparing_specializations
;
1685 /* Returns a hash for a template TMPL and template arguments ARGS. */
1688 hash_tmpl_and_args (tree tmpl
, tree args
)
1690 hashval_t val
= iterative_hash_object (DECL_UID (tmpl
), 0);
1691 return iterative_hash_template_arg (args
, val
);
1694 /* Returns a hash for a spec_entry node based on the TMPL and ARGS members,
1698 spec_hasher::hash (spec_entry
*e
)
1700 return hash_tmpl_and_args (e
->tmpl
, e
->args
);
1703 /* Recursively calculate a hash value for a template argument ARG, for use
1704 in the hash tables of template specializations. */
1707 iterative_hash_template_arg (tree arg
, hashval_t val
)
1709 unsigned HOST_WIDE_INT i
;
1710 enum tree_code code
;
1713 if (arg
== NULL_TREE
)
1714 return iterative_hash_object (arg
, val
);
1719 if (TREE_CODE (arg
) == ARGUMENT_PACK_SELECT
)
1722 code
= TREE_CODE (arg
);
1723 tclass
= TREE_CODE_CLASS (code
);
1725 val
= iterative_hash_object (code
, val
);
1732 case IDENTIFIER_NODE
:
1733 return iterative_hash_object (IDENTIFIER_HASH_VALUE (arg
), val
);
1737 int i
, len
= TREE_VEC_LENGTH (arg
);
1738 for (i
= 0; i
< len
; ++i
)
1739 val
= iterative_hash_template_arg (TREE_VEC_ELT (arg
, i
), val
);
1743 case TYPE_PACK_EXPANSION
:
1744 case EXPR_PACK_EXPANSION
:
1745 val
= iterative_hash_template_arg (PACK_EXPANSION_PATTERN (arg
), val
);
1746 return iterative_hash_template_arg (PACK_EXPANSION_EXTRA_ARGS (arg
), val
);
1748 case TYPE_ARGUMENT_PACK
:
1749 case NONTYPE_ARGUMENT_PACK
:
1750 return iterative_hash_template_arg (ARGUMENT_PACK_ARGS (arg
), val
);
1753 for (; arg
; arg
= TREE_CHAIN (arg
))
1754 val
= iterative_hash_template_arg (TREE_VALUE (arg
), val
);
1758 for (lkp_iterator
iter (arg
); iter
; ++iter
)
1759 val
= iterative_hash_template_arg (*iter
, val
);
1765 iterative_hash_template_arg (TREE_TYPE (arg
), val
);
1766 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (arg
), i
, field
, value
)
1768 val
= iterative_hash_template_arg (field
, val
);
1769 val
= iterative_hash_template_arg (value
, val
);
1775 if (!DECL_ARTIFICIAL (arg
))
1777 val
= iterative_hash_object (DECL_PARM_INDEX (arg
), val
);
1778 val
= iterative_hash_object (DECL_PARM_LEVEL (arg
), val
);
1780 return iterative_hash_template_arg (TREE_TYPE (arg
), val
);
1783 return iterative_hash_template_arg (TARGET_EXPR_INITIAL (arg
), val
);
1786 val
= iterative_hash_template_arg (PTRMEM_CST_CLASS (arg
), val
);
1787 return iterative_hash_template_arg (PTRMEM_CST_MEMBER (arg
), val
);
1789 case TEMPLATE_PARM_INDEX
:
1790 val
= iterative_hash_template_arg
1791 (TREE_TYPE (TEMPLATE_PARM_DECL (arg
)), val
);
1792 val
= iterative_hash_object (TEMPLATE_PARM_LEVEL (arg
), val
);
1793 return iterative_hash_object (TEMPLATE_PARM_IDX (arg
), val
);
1796 val
= iterative_hash_object (TRAIT_EXPR_KIND (arg
), val
);
1797 val
= iterative_hash_template_arg (TRAIT_EXPR_TYPE1 (arg
), val
);
1798 return iterative_hash_template_arg (TRAIT_EXPR_TYPE2 (arg
), val
);
1801 val
= iterative_hash_template_arg (BINFO_TYPE (BASELINK_BINFO (arg
)),
1803 return iterative_hash_template_arg (DECL_NAME (get_first_fn (arg
)),
1807 val
= iterative_hash_template_arg (TREE_OPERAND (arg
, 0), val
);
1808 code
= TREE_CODE (TREE_OPERAND (arg
, 1));
1809 val
= iterative_hash_object (code
, val
);
1810 return iterative_hash_template_arg (TREE_OPERAND (arg
, 2), val
);
1813 /* A lambda can't appear in a template arg, but don't crash on
1815 gcc_assert (seen_error ());
1819 case IMPLICIT_CONV_EXPR
:
1820 case STATIC_CAST_EXPR
:
1821 case REINTERPRET_CAST_EXPR
:
1822 case CONST_CAST_EXPR
:
1823 case DYNAMIC_CAST_EXPR
:
1825 val
= iterative_hash_template_arg (TREE_TYPE (arg
), val
);
1826 /* Now hash operands as usual. */
1836 if (alias_template_specialization_p (arg
))
1838 // We want an alias specialization that survived strip_typedefs
1839 // to hash differently from its TYPE_CANONICAL, to avoid hash
1840 // collisions that compare as different in template_args_equal.
1841 // These could be dependent specializations that strip_typedefs
1842 // left alone, or untouched specializations because
1843 // coerce_template_parms returns the unconverted template
1844 // arguments if it sees incomplete argument packs.
1845 tree ti
= TYPE_ALIAS_TEMPLATE_INFO (arg
);
1846 return hash_tmpl_and_args (TI_TEMPLATE (ti
), TI_ARGS (ti
));
1848 if (TYPE_CANONICAL (arg
))
1849 return iterative_hash_object (TYPE_HASH (TYPE_CANONICAL (arg
)),
1851 else if (TREE_CODE (arg
) == DECLTYPE_TYPE
)
1852 return iterative_hash_template_arg (DECLTYPE_TYPE_EXPR (arg
), val
);
1853 /* Otherwise just compare the types during lookup. */
1856 case tcc_declaration
:
1858 return iterative_hash_expr (arg
, val
);
1861 gcc_assert (IS_EXPR_CODE_CLASS (tclass
));
1863 unsigned n
= cp_tree_operand_length (arg
);
1864 for (i
= 0; i
< n
; ++i
)
1865 val
= iterative_hash_template_arg (TREE_OPERAND (arg
, i
), val
);
1873 /* Unregister the specialization SPEC as a specialization of TMPL.
1874 Replace it with NEW_SPEC, if NEW_SPEC is non-NULL. Returns true
1875 if the SPEC was listed as a specialization of TMPL.
1877 Note that SPEC has been ggc_freed, so we can't look inside it. */
1880 reregister_specialization (tree spec
, tree tinfo
, tree new_spec
)
1885 elt
.tmpl
= most_general_template (TI_TEMPLATE (tinfo
));
1886 elt
.args
= TI_ARGS (tinfo
);
1887 elt
.spec
= NULL_TREE
;
1889 entry
= decl_specializations
->find (&elt
);
1892 gcc_assert (entry
->spec
== spec
|| entry
->spec
== new_spec
);
1893 gcc_assert (new_spec
!= NULL_TREE
);
1894 entry
->spec
= new_spec
;
1901 /* Like register_specialization, but for local declarations. We are
1902 registering SPEC, an instantiation of TMPL. */
1905 register_local_specialization (tree spec
, tree tmpl
)
1907 gcc_assert (tmpl
!= spec
);
1908 local_specializations
->put (tmpl
, spec
);
1911 /* TYPE is a class type. Returns true if TYPE is an explicitly
1912 specialized class. */
1915 explicit_class_specialization_p (tree type
)
1917 if (!CLASSTYPE_TEMPLATE_SPECIALIZATION (type
))
1919 return !uses_template_parms (CLASSTYPE_TI_ARGS (type
));
1922 /* Print the list of functions at FNS, going through all the overloads
1923 for each element of the list. Alternatively, FNS can not be a
1924 TREE_LIST, in which case it will be printed together with all the
1927 MORE and *STR should respectively be FALSE and NULL when the function
1928 is called from the outside. They are used internally on recursive
1929 calls. print_candidates manages the two parameters and leaves NULL
1930 in *STR when it ends. */
1933 print_candidates_1 (tree fns
, char **str
, bool more
= false)
1935 if (TREE_CODE (fns
) == TREE_LIST
)
1936 for (; fns
; fns
= TREE_CHAIN (fns
))
1937 print_candidates_1 (TREE_VALUE (fns
), str
, more
|| TREE_CHAIN (fns
));
1939 for (lkp_iterator
iter (fns
); iter
;)
1944 const char *pfx
= *str
;
1948 pfx
= _("candidates are:");
1950 pfx
= _("candidate is:");
1951 *str
= get_spaces (pfx
);
1953 inform (DECL_SOURCE_LOCATION (cand
), "%s %#qD", pfx
, cand
);
1957 /* Print the list of candidate FNS in an error message. FNS can also
1958 be a TREE_LIST of non-functions in the case of an ambiguous lookup. */
1961 print_candidates (tree fns
)
1964 print_candidates_1 (fns
, &str
);
1968 /* Get a (possibly) constrained template declaration for the
1969 purpose of ordering candidates. */
1971 get_template_for_ordering (tree list
)
1973 gcc_assert (TREE_CODE (list
) == TREE_LIST
);
1974 tree f
= TREE_VALUE (list
);
1975 if (tree ti
= DECL_TEMPLATE_INFO (f
))
1976 return TI_TEMPLATE (ti
);
1980 /* Among candidates having the same signature, return the
1981 most constrained or NULL_TREE if there is no best candidate.
1982 If the signatures of candidates vary (e.g., template
1983 specialization vs. member function), then there can be no
1986 Note that we don't compare constraints on the functions
1987 themselves, but rather those of their templates. */
1989 most_constrained_function (tree candidates
)
1991 // Try to find the best candidate in a first pass.
1992 tree champ
= candidates
;
1993 for (tree c
= TREE_CHAIN (champ
); c
; c
= TREE_CHAIN (c
))
1995 int winner
= more_constrained (get_template_for_ordering (champ
),
1996 get_template_for_ordering (c
));
1998 champ
= c
; // The candidate is more constrained
1999 else if (winner
== 0)
2000 return NULL_TREE
; // Neither is more constrained
2003 // Verify that the champ is better than previous candidates.
2004 for (tree c
= candidates
; c
!= champ
; c
= TREE_CHAIN (c
)) {
2005 if (!more_constrained (get_template_for_ordering (champ
),
2006 get_template_for_ordering (c
)))
2014 /* Returns the template (one of the functions given by TEMPLATE_ID)
2015 which can be specialized to match the indicated DECL with the
2016 explicit template args given in TEMPLATE_ID. The DECL may be
2017 NULL_TREE if none is available. In that case, the functions in
2018 TEMPLATE_ID are non-members.
2020 If NEED_MEMBER_TEMPLATE is nonzero the function is known to be a
2021 specialization of a member template.
2023 The TEMPLATE_COUNT is the number of references to qualifying
2024 template classes that appeared in the name of the function. See
2025 check_explicit_specialization for a more accurate description.
2027 TSK indicates what kind of template declaration (if any) is being
2028 declared. TSK_TEMPLATE indicates that the declaration given by
2029 DECL, though a FUNCTION_DECL, has template parameters, and is
2030 therefore a template function.
2032 The template args (those explicitly specified and those deduced)
2033 are output in a newly created vector *TARGS_OUT.
2035 If it is impossible to determine the result, an error message is
2036 issued. The error_mark_node is returned to indicate failure. */
2039 determine_specialization (tree template_id
,
2042 int need_member_template
,
2048 tree explicit_targs
;
2049 tree candidates
= NULL_TREE
;
2051 /* A TREE_LIST of templates of which DECL may be a specialization.
2052 The TREE_VALUE of each node is a TEMPLATE_DECL. The
2053 corresponding TREE_PURPOSE is the set of template arguments that,
2054 when used to instantiate the template, would produce a function
2055 with the signature of DECL. */
2056 tree templates
= NULL_TREE
;
2058 cp_binding_level
*b
;
2060 *targs_out
= NULL_TREE
;
2062 if (template_id
== error_mark_node
|| decl
== error_mark_node
)
2063 return error_mark_node
;
2065 /* We shouldn't be specializing a member template of an
2066 unspecialized class template; we already gave an error in
2067 check_specialization_scope, now avoid crashing. */
2069 && template_count
&& DECL_CLASS_SCOPE_P (decl
)
2070 && template_class_depth (DECL_CONTEXT (decl
)) > 0)
2072 gcc_assert (errorcount
);
2073 return error_mark_node
;
2076 fns
= TREE_OPERAND (template_id
, 0);
2077 explicit_targs
= TREE_OPERAND (template_id
, 1);
2079 if (fns
== error_mark_node
)
2080 return error_mark_node
;
2082 /* Check for baselinks. */
2083 if (BASELINK_P (fns
))
2084 fns
= BASELINK_FUNCTIONS (fns
);
2086 if (TREE_CODE (decl
) == FUNCTION_DECL
&& !is_overloaded_fn (fns
))
2088 error ("%qD is not a function template", fns
);
2089 return error_mark_node
;
2091 else if (VAR_P (decl
) && !variable_template_p (fns
))
2093 error ("%qD is not a variable template", fns
);
2094 return error_mark_node
;
2097 /* Count the number of template headers specified for this
2100 for (b
= current_binding_level
;
2101 b
->kind
== sk_template_parms
;
2105 tree orig_fns
= fns
;
2107 if (variable_template_p (fns
))
2109 tree parms
= INNERMOST_TEMPLATE_PARMS (DECL_TEMPLATE_PARMS (fns
));
2110 targs
= coerce_template_parms (parms
, explicit_targs
, fns
,
2111 tf_warning_or_error
,
2112 /*req_all*/true, /*use_defarg*/true);
2113 if (targs
!= error_mark_node
)
2114 templates
= tree_cons (targs
, fns
, templates
);
2116 else for (lkp_iterator
iter (fns
); iter
; ++iter
)
2120 if (TREE_CODE (fn
) == TEMPLATE_DECL
)
2122 tree decl_arg_types
;
2126 /* In case of explicit specialization, we need to check if
2127 the number of template headers appearing in the specialization
2128 is correct. This is usually done in check_explicit_specialization,
2129 but the check done there cannot be exhaustive when specializing
2130 member functions. Consider the following code:
2132 template <> void A<int>::f(int);
2133 template <> template <> void A<int>::f(int);
2135 Assuming that A<int> is not itself an explicit specialization
2136 already, the first line specializes "f" which is a non-template
2137 member function, whilst the second line specializes "f" which
2138 is a template member function. So both lines are syntactically
2139 correct, and check_explicit_specialization does not reject
2142 Here, we can do better, as we are matching the specialization
2143 against the declarations. We count the number of template
2144 headers, and we check if they match TEMPLATE_COUNT + 1
2145 (TEMPLATE_COUNT is the number of qualifying template classes,
2146 plus there must be another header for the member template
2149 Notice that if header_count is zero, this is not a
2150 specialization but rather a template instantiation, so there
2151 is no check we can perform here. */
2152 if (header_count
&& header_count
!= template_count
+ 1)
2155 /* Check that the number of template arguments at the
2156 innermost level for DECL is the same as for FN. */
2157 if (current_binding_level
->kind
== sk_template_parms
2158 && !current_binding_level
->explicit_spec_p
2159 && (TREE_VEC_LENGTH (DECL_INNERMOST_TEMPLATE_PARMS (fn
))
2160 != TREE_VEC_LENGTH (INNERMOST_TEMPLATE_PARMS
2161 (current_template_parms
))))
2164 /* DECL might be a specialization of FN. */
2165 decl_arg_types
= TYPE_ARG_TYPES (TREE_TYPE (decl
));
2166 fn_arg_types
= TYPE_ARG_TYPES (TREE_TYPE (fn
));
2168 /* For a non-static member function, we need to make sure
2169 that the const qualification is the same. Since
2170 get_bindings does not try to merge the "this" parameter,
2171 we must do the comparison explicitly. */
2172 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fn
))
2174 if (!same_type_p (TREE_VALUE (fn_arg_types
),
2175 TREE_VALUE (decl_arg_types
)))
2178 /* And the ref-qualification. */
2179 if (type_memfn_rqual (TREE_TYPE (decl
))
2180 != type_memfn_rqual (TREE_TYPE (fn
)))
2184 /* Skip the "this" parameter and, for constructors of
2185 classes with virtual bases, the VTT parameter. A
2186 full specialization of a constructor will have a VTT
2187 parameter, but a template never will. */
2189 = skip_artificial_parms_for (decl
, decl_arg_types
);
2191 = skip_artificial_parms_for (fn
, fn_arg_types
);
2193 /* Function templates cannot be specializations; there are
2194 no partial specializations of functions. Therefore, if
2195 the type of DECL does not match FN, there is no
2198 Note that it should never be the case that we have both
2199 candidates added here, and for regular member functions
2201 if (tsk
== tsk_template
)
2203 if (compparms (fn_arg_types
, decl_arg_types
))
2204 candidates
= tree_cons (NULL_TREE
, fn
, candidates
);
2208 /* See whether this function might be a specialization of this
2209 template. Suppress access control because we might be trying
2210 to make this specialization a friend, and we have already done
2211 access control for the declaration of the specialization. */
2212 push_deferring_access_checks (dk_no_check
);
2213 targs
= get_bindings (fn
, decl
, explicit_targs
, /*check_ret=*/true);
2214 pop_deferring_access_checks ();
2217 /* We cannot deduce template arguments that when used to
2218 specialize TMPL will produce DECL. */
2221 if (uses_template_parms (targs
))
2222 /* We deduced something involving 'auto', which isn't a valid
2223 template argument. */
2226 /* Remove, from the set of candidates, all those functions
2227 whose constraints are not satisfied. */
2228 if (flag_concepts
&& !constraints_satisfied_p (fn
, targs
))
2231 // Then, try to form the new function type.
2232 insttype
= tsubst (TREE_TYPE (fn
), targs
, tf_fndecl_type
, NULL_TREE
);
2233 if (insttype
== error_mark_node
)
2236 = skip_artificial_parms_for (fn
, TYPE_ARG_TYPES (insttype
));
2237 if (!compparms (fn_arg_types
, decl_arg_types
))
2240 /* Save this template, and the arguments deduced. */
2241 templates
= tree_cons (targs
, fn
, templates
);
2243 else if (need_member_template
)
2244 /* FN is an ordinary member function, and we need a
2245 specialization of a member template. */
2247 else if (TREE_CODE (fn
) != FUNCTION_DECL
)
2248 /* We can get IDENTIFIER_NODEs here in certain erroneous
2251 else if (!DECL_FUNCTION_MEMBER_P (fn
))
2252 /* This is just an ordinary non-member function. Nothing can
2253 be a specialization of that. */
2255 else if (DECL_ARTIFICIAL (fn
))
2256 /* Cannot specialize functions that are created implicitly. */
2260 tree decl_arg_types
;
2262 /* This is an ordinary member function. However, since
2263 we're here, we can assume its enclosing class is a
2264 template class. For example,
2266 template <typename T> struct S { void f(); };
2267 template <> void S<int>::f() {}
2269 Here, S<int>::f is a non-template, but S<int> is a
2270 template class. If FN has the same type as DECL, we
2271 might be in business. */
2273 if (!DECL_TEMPLATE_INFO (fn
))
2274 /* Its enclosing class is an explicit specialization
2275 of a template class. This is not a candidate. */
2278 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl
)),
2279 TREE_TYPE (TREE_TYPE (fn
))))
2280 /* The return types differ. */
2283 /* Adjust the type of DECL in case FN is a static member. */
2284 decl_arg_types
= TYPE_ARG_TYPES (TREE_TYPE (decl
));
2285 if (DECL_STATIC_FUNCTION_P (fn
)
2286 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl
))
2287 decl_arg_types
= TREE_CHAIN (decl_arg_types
);
2289 if (!compparms (TYPE_ARG_TYPES (TREE_TYPE (fn
)),
2293 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fn
)
2294 && (type_memfn_rqual (TREE_TYPE (decl
))
2295 != type_memfn_rqual (TREE_TYPE (fn
))))
2298 // If the deduced arguments do not satisfy the constraints,
2299 // this is not a candidate.
2300 if (flag_concepts
&& !constraints_satisfied_p (fn
))
2303 // Add the candidate.
2304 candidates
= tree_cons (NULL_TREE
, fn
, candidates
);
2308 if (templates
&& TREE_CHAIN (templates
))
2314 It is possible for a specialization with a given function
2315 signature to be instantiated from more than one function
2316 template. In such cases, explicit specification of the
2317 template arguments must be used to uniquely identify the
2318 function template specialization being specialized.
2320 Note that here, there's no suggestion that we're supposed to
2321 determine which of the candidate templates is most
2322 specialized. However, we, also have:
2326 Partial ordering of overloaded function template
2327 declarations is used in the following contexts to select
2328 the function template to which a function template
2329 specialization refers:
2331 -- when an explicit specialization refers to a function
2334 So, we do use the partial ordering rules, at least for now.
2335 This extension can only serve to make invalid programs valid,
2336 so it's safe. And, there is strong anecdotal evidence that
2337 the committee intended the partial ordering rules to apply;
2338 the EDG front end has that behavior, and John Spicer claims
2339 that the committee simply forgot to delete the wording in
2340 [temp.expl.spec]. */
2341 tree tmpl
= most_specialized_instantiation (templates
);
2342 if (tmpl
!= error_mark_node
)
2345 TREE_CHAIN (templates
) = NULL_TREE
;
2349 // Concepts allows multiple declarations of member functions
2350 // with the same signature. Like above, we need to rely on
2351 // on the partial ordering of those candidates to determine which
2353 if (flag_concepts
&& candidates
&& TREE_CHAIN (candidates
))
2355 if (tree cand
= most_constrained_function (candidates
))
2358 TREE_CHAIN (cand
) = NULL_TREE
;
2362 if (templates
== NULL_TREE
&& candidates
== NULL_TREE
)
2364 error ("template-id %qD for %q+D does not match any template "
2365 "declaration", template_id
, decl
);
2366 if (header_count
&& header_count
!= template_count
+ 1)
2367 inform (input_location
, "saw %d %<template<>%>, need %d for "
2368 "specializing a member function template",
2369 header_count
, template_count
+ 1);
2371 print_candidates (orig_fns
);
2372 return error_mark_node
;
2374 else if ((templates
&& TREE_CHAIN (templates
))
2375 || (candidates
&& TREE_CHAIN (candidates
))
2376 || (templates
&& candidates
))
2378 error ("ambiguous template specialization %qD for %q+D",
2380 candidates
= chainon (candidates
, templates
);
2381 print_candidates (candidates
);
2382 return error_mark_node
;
2385 /* We have one, and exactly one, match. */
2388 tree fn
= TREE_VALUE (candidates
);
2389 *targs_out
= copy_node (DECL_TI_ARGS (fn
));
2391 // Propagate the candidate's constraints to the declaration.
2392 set_constraints (decl
, get_constraints (fn
));
2394 /* DECL is a re-declaration or partial instantiation of a template
2396 if (TREE_CODE (fn
) == TEMPLATE_DECL
)
2398 /* It was a specialization of an ordinary member function in a
2400 return DECL_TI_TEMPLATE (fn
);
2403 /* It was a specialization of a template. */
2404 targs
= DECL_TI_ARGS (DECL_TEMPLATE_RESULT (TREE_VALUE (templates
)));
2405 if (TMPL_ARGS_HAVE_MULTIPLE_LEVELS (targs
))
2407 *targs_out
= copy_node (targs
);
2408 SET_TMPL_ARGS_LEVEL (*targs_out
,
2409 TMPL_ARGS_DEPTH (*targs_out
),
2410 TREE_PURPOSE (templates
));
2413 *targs_out
= TREE_PURPOSE (templates
);
2414 return TREE_VALUE (templates
);
2417 /* Returns a chain of parameter types, exactly like the SPEC_TYPES,
2418 but with the default argument values filled in from those in the
2422 copy_default_args_to_explicit_spec_1 (tree spec_types
,
2425 tree new_spec_types
;
2430 if (spec_types
== void_list_node
)
2431 return void_list_node
;
2433 /* Substitute into the rest of the list. */
2435 copy_default_args_to_explicit_spec_1 (TREE_CHAIN (spec_types
),
2436 TREE_CHAIN (tmpl_types
));
2438 /* Add the default argument for this parameter. */
2439 return hash_tree_cons (TREE_PURPOSE (tmpl_types
),
2440 TREE_VALUE (spec_types
),
2444 /* DECL is an explicit specialization. Replicate default arguments
2445 from the template it specializes. (That way, code like:
2447 template <class T> void f(T = 3);
2448 template <> void f(double);
2451 works, as required.) An alternative approach would be to look up
2452 the correct default arguments at the call-site, but this approach
2453 is consistent with how implicit instantiations are handled. */
2456 copy_default_args_to_explicit_spec (tree decl
)
2461 tree new_spec_types
;
2465 tree object_type
= NULL_TREE
;
2466 tree in_charge
= NULL_TREE
;
2467 tree vtt
= NULL_TREE
;
2469 /* See if there's anything we need to do. */
2470 tmpl
= DECL_TI_TEMPLATE (decl
);
2471 tmpl_types
= TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (tmpl
)));
2472 for (t
= tmpl_types
; t
; t
= TREE_CHAIN (t
))
2473 if (TREE_PURPOSE (t
))
2478 old_type
= TREE_TYPE (decl
);
2479 spec_types
= TYPE_ARG_TYPES (old_type
);
2481 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (decl
))
2483 /* Remove the this pointer, but remember the object's type for
2485 object_type
= TREE_TYPE (TREE_VALUE (spec_types
));
2486 spec_types
= TREE_CHAIN (spec_types
);
2487 tmpl_types
= TREE_CHAIN (tmpl_types
);
2489 if (DECL_HAS_IN_CHARGE_PARM_P (decl
))
2491 /* DECL may contain more parameters than TMPL due to the extra
2492 in-charge parameter in constructors and destructors. */
2493 in_charge
= spec_types
;
2494 spec_types
= TREE_CHAIN (spec_types
);
2496 if (DECL_HAS_VTT_PARM_P (decl
))
2499 spec_types
= TREE_CHAIN (spec_types
);
2503 /* Compute the merged default arguments. */
2505 copy_default_args_to_explicit_spec_1 (spec_types
, tmpl_types
);
2507 /* Compute the new FUNCTION_TYPE. */
2511 new_spec_types
= hash_tree_cons (TREE_PURPOSE (vtt
),
2516 /* Put the in-charge parameter back. */
2517 new_spec_types
= hash_tree_cons (TREE_PURPOSE (in_charge
),
2518 TREE_VALUE (in_charge
),
2521 new_type
= build_method_type_directly (object_type
,
2522 TREE_TYPE (old_type
),
2526 new_type
= build_function_type (TREE_TYPE (old_type
),
2528 new_type
= cp_build_type_attribute_variant (new_type
,
2529 TYPE_ATTRIBUTES (old_type
));
2530 new_type
= build_exception_variant (new_type
,
2531 TYPE_RAISES_EXCEPTIONS (old_type
));
2533 if (TYPE_HAS_LATE_RETURN_TYPE (old_type
))
2534 TYPE_HAS_LATE_RETURN_TYPE (new_type
) = 1;
2536 TREE_TYPE (decl
) = new_type
;
2539 /* Return the number of template headers we expect to see for a definition
2540 or specialization of CTYPE or one of its non-template members. */
2543 num_template_headers_for_class (tree ctype
)
2545 int num_templates
= 0;
2547 while (ctype
&& CLASS_TYPE_P (ctype
))
2549 /* You're supposed to have one `template <...>' for every
2550 template class, but you don't need one for a full
2551 specialization. For example:
2553 template <class T> struct S{};
2554 template <> struct S<int> { void f(); };
2555 void S<int>::f () {}
2557 is correct; there shouldn't be a `template <>' for the
2558 definition of `S<int>::f'. */
2559 if (!CLASSTYPE_TEMPLATE_INFO (ctype
))
2560 /* If CTYPE does not have template information of any
2561 kind, then it is not a template, nor is it nested
2562 within a template. */
2564 if (explicit_class_specialization_p (ctype
))
2566 if (PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (ctype
)))
2569 ctype
= TYPE_CONTEXT (ctype
);
2572 return num_templates
;
2575 /* Do a simple sanity check on the template headers that precede the
2576 variable declaration DECL. */
2579 check_template_variable (tree decl
)
2581 tree ctx
= CP_DECL_CONTEXT (decl
);
2582 int wanted
= num_template_headers_for_class (ctx
);
2583 if (DECL_LANG_SPECIFIC (decl
) && DECL_TEMPLATE_INFO (decl
)
2584 && PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl
)))
2586 if (cxx_dialect
< cxx14
)
2587 pedwarn (DECL_SOURCE_LOCATION (decl
), 0,
2588 "variable templates only available with "
2589 "-std=c++14 or -std=gnu++14");
2591 // Namespace-scope variable templates should have a template header.
2594 if (template_header_count
> wanted
)
2596 bool warned
= pedwarn (DECL_SOURCE_LOCATION (decl
), 0,
2597 "too many template headers for %qD "
2600 if (warned
&& CLASS_TYPE_P (ctx
)
2601 && CLASSTYPE_TEMPLATE_SPECIALIZATION (ctx
))
2602 inform (DECL_SOURCE_LOCATION (decl
),
2603 "members of an explicitly specialized class are defined "
2604 "without a template header");
2608 /* An explicit specialization whose declarator-id or class-head-name is not
2609 qualified shall be declared in the nearest enclosing namespace of the
2610 template, or, if the namespace is inline (7.3.1), any namespace from its
2611 enclosing namespace set.
2613 If the name declared in the explicit instantiation is an unqualified name,
2614 the explicit instantiation shall appear in the namespace where its template
2615 is declared or, if that namespace is inline (7.3.1), any namespace from its
2616 enclosing namespace set. */
2619 check_unqualified_spec_or_inst (tree t
, location_t loc
)
2621 tree tmpl
= most_general_template (t
);
2622 if (DECL_NAMESPACE_SCOPE_P (tmpl
)
2623 && !is_nested_namespace (current_namespace
,
2624 CP_DECL_CONTEXT (tmpl
), true))
2626 if (processing_specialization
)
2627 permerror (loc
, "explicit specialization of %qD outside its "
2628 "namespace must use a nested-name-specifier", tmpl
);
2629 else if (processing_explicit_instantiation
2630 && cxx_dialect
>= cxx11
)
2631 /* This was allowed in C++98, so only pedwarn. */
2632 pedwarn (loc
, OPT_Wpedantic
, "explicit instantiation of %qD "
2633 "outside its namespace must use a nested-name-"
2638 /* Warn for a template specialization SPEC that is missing some of a set
2639 of function or type attributes that the template TEMPL is declared with.
2640 ATTRLIST is a list of additional attributes that SPEC should be taken
2641 to ultimately be declared with. */
2644 warn_spec_missing_attributes (tree tmpl
, tree spec
, tree attrlist
)
2646 if (DECL_FUNCTION_TEMPLATE_P (tmpl
))
2647 tmpl
= DECL_TEMPLATE_RESULT (tmpl
);
2649 if (TREE_CODE (tmpl
) != FUNCTION_DECL
)
2652 /* Avoid warning if either declaration or its type is deprecated. */
2653 if (TREE_DEPRECATED (tmpl
)
2654 || TREE_DEPRECATED (spec
))
2657 tree tmpl_type
= TREE_TYPE (tmpl
);
2658 tree spec_type
= TREE_TYPE (spec
);
2660 if (TREE_DEPRECATED (tmpl_type
)
2661 || TREE_DEPRECATED (spec_type
)
2662 || TREE_DEPRECATED (TREE_TYPE (tmpl_type
))
2663 || TREE_DEPRECATED (TREE_TYPE (spec_type
)))
2666 tree tmpl_attrs
[] = { DECL_ATTRIBUTES (tmpl
), TYPE_ATTRIBUTES (tmpl_type
) };
2667 tree spec_attrs
[] = { DECL_ATTRIBUTES (spec
), TYPE_ATTRIBUTES (spec_type
) };
2670 spec_attrs
[0] = attrlist
;
2671 else if (!spec_attrs
[1])
2672 spec_attrs
[1] = attrlist
;
2674 /* Avoid warning if the primary has no attributes. */
2675 if (!tmpl_attrs
[0] && !tmpl_attrs
[1])
2678 /* Avoid warning if either declaration contains an attribute on
2679 the white list below. */
2680 const char* const whitelist
[] = {
2684 for (unsigned i
= 0; i
!= 2; ++i
)
2685 for (unsigned j
= 0; j
!= sizeof whitelist
/ sizeof *whitelist
; ++j
)
2686 if (lookup_attribute (whitelist
[j
], tmpl_attrs
[i
])
2687 || lookup_attribute (whitelist
[j
], spec_attrs
[i
]))
2690 /* Avoid warning if the difference between the primary and
2691 the specialization is not in one of the attributes below. */
2692 const char* const blacklist
[] = {
2693 "alloc_align", "alloc_size", "assume_aligned", "format",
2694 "format_arg", "malloc", "nonnull"
2697 /* Put together a list of the black listed attributes that the primary
2698 template is declared with that the specialization is not, in case
2699 it's not apparent from the most recent declaration of the primary. */
2700 unsigned nattrs
= 0;
2703 for (unsigned i
= 0; i
!= sizeof blacklist
/ sizeof *blacklist
; ++i
)
2705 for (unsigned j
= 0; j
!= 2; ++j
)
2707 if (!lookup_attribute (blacklist
[i
], tmpl_attrs
[j
]))
2710 for (unsigned k
= 0; k
!= 1 + !!spec_attrs
[1]; ++k
)
2712 if (lookup_attribute (blacklist
[i
], spec_attrs
[k
]))
2716 pp_string (&str
, ", ");
2717 pp_begin_quote (&str
, pp_show_color (global_dc
->printer
));
2718 pp_string (&str
, blacklist
[i
]);
2719 pp_end_quote (&str
, pp_show_color (global_dc
->printer
));
2728 if (warning_at (DECL_SOURCE_LOCATION (spec
), OPT_Wmissing_attributes
,
2729 "explicit specialization %q#D may be missing attributes",
2731 inform (DECL_SOURCE_LOCATION (tmpl
),
2733 ? G_("missing primary template attributes %s")
2734 : G_("missing primary template attribute %s"),
2735 pp_formatted_text (&str
));
2738 /* Check to see if the function just declared, as indicated in
2739 DECLARATOR, and in DECL, is a specialization of a function
2740 template. We may also discover that the declaration is an explicit
2741 instantiation at this point.
2743 Returns DECL, or an equivalent declaration that should be used
2744 instead if all goes well. Issues an error message if something is
2745 amiss. Returns error_mark_node if the error is not easily
2748 FLAGS is a bitmask consisting of the following flags:
2750 2: The function has a definition.
2751 4: The function is a friend.
2753 The TEMPLATE_COUNT is the number of references to qualifying
2754 template classes that appeared in the name of the function. For
2757 template <class T> struct S { void f(); };
2760 the TEMPLATE_COUNT would be 1. However, explicitly specialized
2761 classes are not counted in the TEMPLATE_COUNT, so that in
2763 template <class T> struct S {};
2764 template <> struct S<int> { void f(); }
2765 template <> void S<int>::f();
2767 the TEMPLATE_COUNT would be 0. (Note that this declaration is
2768 invalid; there should be no template <>.)
2770 If the function is a specialization, it is marked as such via
2771 DECL_TEMPLATE_SPECIALIZATION. Furthermore, its DECL_TEMPLATE_INFO
2772 is set up correctly, and it is added to the list of specializations
2773 for that template. */
2776 check_explicit_specialization (tree declarator
,
2782 int have_def
= flags
& 2;
2783 int is_friend
= flags
& 4;
2784 bool is_concept
= flags
& 8;
2785 int specialization
= 0;
2786 int explicit_instantiation
= 0;
2787 int member_specialization
= 0;
2788 tree ctype
= DECL_CLASS_CONTEXT (decl
);
2789 tree dname
= DECL_NAME (decl
);
2794 if (!processing_specialization
)
2797 tsk
= tsk_excessive_parms
;
2800 tsk
= current_tmpl_spec_kind (template_count
);
2805 if (processing_specialization
&& !VAR_P (decl
))
2808 SET_DECL_TEMPLATE_SPECIALIZATION (decl
);
2810 else if (TREE_CODE (declarator
) == TEMPLATE_ID_EXPR
)
2813 /* This could be something like:
2815 template <class T> void f(T);
2816 class S { friend void f<>(int); } */
2820 /* This case handles bogus declarations like template <>
2821 template <class T> void f<int>(); */
2823 error ("template-id %qD in declaration of primary template",
2830 case tsk_invalid_member_spec
:
2831 /* The error has already been reported in
2832 check_specialization_scope. */
2833 return error_mark_node
;
2835 case tsk_invalid_expl_inst
:
2836 error ("template parameter list used in explicit instantiation");
2842 error ("definition provided for explicit instantiation");
2844 explicit_instantiation
= 1;
2847 case tsk_excessive_parms
:
2848 case tsk_insufficient_parms
:
2849 if (tsk
== tsk_excessive_parms
)
2850 error ("too many template parameter lists in declaration of %qD",
2852 else if (template_header_count
)
2853 error("too few template parameter lists in declaration of %qD", decl
);
2855 error("explicit specialization of %qD must be introduced by "
2856 "%<template <>%>", decl
);
2861 error ("explicit specialization declared %<concept%>");
2863 if (VAR_P (decl
) && TREE_CODE (declarator
) != TEMPLATE_ID_EXPR
)
2864 /* In cases like template<> constexpr bool v = true;
2865 We'll give an error in check_template_variable. */
2868 SET_DECL_TEMPLATE_SPECIALIZATION (decl
);
2870 member_specialization
= 1;
2876 if (TREE_CODE (declarator
) == TEMPLATE_ID_EXPR
)
2878 /* This case handles bogus declarations like template <>
2879 template <class T> void f<int>(); */
2881 if (!uses_template_parms (declarator
))
2882 error ("template-id %qD in declaration of primary template",
2884 else if (variable_template_p (TREE_OPERAND (declarator
, 0)))
2886 /* Partial specialization of variable template. */
2887 SET_DECL_TEMPLATE_SPECIALIZATION (decl
);
2891 else if (cxx_dialect
< cxx14
)
2892 error ("non-type partial specialization %qD "
2893 "is not allowed", declarator
);
2895 error ("non-class, non-variable partial specialization %qD "
2896 "is not allowed", declarator
);
2901 if (ctype
&& CLASSTYPE_TEMPLATE_INSTANTIATION (ctype
))
2902 /* This is a specialization of a member template, without
2903 specialization the containing class. Something like:
2905 template <class T> struct S {
2906 template <class U> void f (U);
2908 template <> template <class U> void S<int>::f(U) {}
2910 That's a specialization -- but of the entire template. */
2918 if ((specialization
|| member_specialization
)
2919 /* This doesn't apply to variable templates. */
2920 && (TREE_CODE (TREE_TYPE (decl
)) == FUNCTION_TYPE
2921 || TREE_CODE (TREE_TYPE (decl
)) == METHOD_TYPE
))
2923 tree t
= TYPE_ARG_TYPES (TREE_TYPE (decl
));
2924 for (; t
; t
= TREE_CHAIN (t
))
2925 if (TREE_PURPOSE (t
))
2927 permerror (input_location
,
2928 "default argument specified in explicit specialization");
2933 if (specialization
|| member_specialization
|| explicit_instantiation
)
2935 tree tmpl
= NULL_TREE
;
2936 tree targs
= NULL_TREE
;
2937 bool was_template_id
= (TREE_CODE (declarator
) == TEMPLATE_ID_EXPR
);
2939 /* Make sure that the declarator is a TEMPLATE_ID_EXPR. */
2940 if (!was_template_id
)
2944 gcc_assert (identifier_p (declarator
));
2949 /* If there is no class context, the explicit instantiation
2950 must be at namespace scope. */
2951 gcc_assert (DECL_NAMESPACE_SCOPE_P (decl
));
2953 /* Find the namespace binding, using the declaration
2955 fns
= lookup_qualified_name (CP_DECL_CONTEXT (decl
), dname
,
2957 if (fns
== error_mark_node
)
2958 /* If lookup fails, look for a friend declaration so we can
2959 give a better diagnostic. */
2960 fns
= lookup_qualified_name (CP_DECL_CONTEXT (decl
), dname
,
2961 /*type*/false, /*complain*/true,
2964 if (fns
== error_mark_node
|| !is_overloaded_fn (fns
))
2966 error ("%qD is not a template function", dname
);
2967 fns
= error_mark_node
;
2971 declarator
= lookup_template_function (fns
, NULL_TREE
);
2974 if (declarator
== error_mark_node
)
2975 return error_mark_node
;
2977 if (ctype
!= NULL_TREE
&& TYPE_BEING_DEFINED (ctype
))
2979 if (!explicit_instantiation
)
2980 /* A specialization in class scope. This is invalid,
2981 but the error will already have been flagged by
2982 check_specialization_scope. */
2983 return error_mark_node
;
2986 /* It's not valid to write an explicit instantiation in
2989 class C { template void f(); }
2991 This case is caught by the parser. However, on
2994 template class C { void f(); };
2996 (which is invalid) we can get here. The error will be
3003 else if (ctype
!= NULL_TREE
3004 && (identifier_p (TREE_OPERAND (declarator
, 0))))
3006 // We'll match variable templates in start_decl.
3010 /* Find the list of functions in ctype that have the same
3011 name as the declared function. */
3012 tree name
= TREE_OPERAND (declarator
, 0);
3014 if (constructor_name_p (name
, ctype
))
3016 if (DECL_CONSTRUCTOR_P (decl
)
3017 ? !TYPE_HAS_USER_CONSTRUCTOR (ctype
)
3018 : !CLASSTYPE_DESTRUCTOR (ctype
))
3020 /* From [temp.expl.spec]:
3022 If such an explicit specialization for the member
3023 of a class template names an implicitly-declared
3024 special member function (clause _special_), the
3025 program is ill-formed.
3027 Similar language is found in [temp.explicit]. */
3028 error ("specialization of implicitly-declared special member function");
3029 return error_mark_node
;
3032 name
= DECL_NAME (decl
);
3035 /* For a type-conversion operator, We might be looking for
3036 `operator int' which will be a specialization of
3037 `operator T'. Grab all the conversion operators, and
3038 then select from them. */
3039 tree fns
= get_class_binding (ctype
, IDENTIFIER_CONV_OP_P (name
)
3040 ? conv_op_identifier
: name
);
3042 if (fns
== NULL_TREE
)
3044 error ("no member function %qD declared in %qT", name
, ctype
);
3045 return error_mark_node
;
3048 TREE_OPERAND (declarator
, 0) = fns
;
3051 /* Figure out what exactly is being specialized at this point.
3052 Note that for an explicit instantiation, even one for a
3053 member function, we cannot tell a priori whether the
3054 instantiation is for a member template, or just a member
3055 function of a template class. Even if a member template is
3056 being instantiated, the member template arguments may be
3057 elided if they can be deduced from the rest of the
3059 tmpl
= determine_specialization (declarator
, decl
,
3061 member_specialization
,
3065 if (!tmpl
|| tmpl
== error_mark_node
)
3066 /* We couldn't figure out what this declaration was
3068 return error_mark_node
;
3071 if (TREE_CODE (decl
) == FUNCTION_DECL
3072 && DECL_HIDDEN_FRIEND_P (tmpl
))
3074 if (pedwarn (DECL_SOURCE_LOCATION (decl
), 0,
3075 "friend declaration %qD is not visible to "
3076 "explicit specialization", tmpl
))
3077 inform (DECL_SOURCE_LOCATION (tmpl
),
3078 "friend declaration here");
3080 else if (!ctype
&& !is_friend
3081 && CP_DECL_CONTEXT (decl
) == current_namespace
)
3082 check_unqualified_spec_or_inst (tmpl
, DECL_SOURCE_LOCATION (decl
));
3084 tree gen_tmpl
= most_general_template (tmpl
);
3086 if (explicit_instantiation
)
3088 /* We don't set DECL_EXPLICIT_INSTANTIATION here; that
3089 is done by do_decl_instantiation later. */
3091 int arg_depth
= TMPL_ARGS_DEPTH (targs
);
3092 int parm_depth
= TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (tmpl
));
3094 if (arg_depth
> parm_depth
)
3096 /* If TMPL is not the most general template (for
3097 example, if TMPL is a friend template that is
3098 injected into namespace scope), then there will
3099 be too many levels of TARGS. Remove some of them
3104 new_targs
= make_tree_vec (parm_depth
);
3105 for (i
= arg_depth
- parm_depth
; i
< arg_depth
; ++i
)
3106 TREE_VEC_ELT (new_targs
, i
- (arg_depth
- parm_depth
))
3107 = TREE_VEC_ELT (targs
, i
);
3111 return instantiate_template (tmpl
, targs
, tf_error
);
3114 /* If we thought that the DECL was a member function, but it
3115 turns out to be specializing a static member function,
3116 make DECL a static member function as well. */
3117 if (DECL_FUNCTION_TEMPLATE_P (tmpl
)
3118 && DECL_STATIC_FUNCTION_P (tmpl
)
3119 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl
))
3120 revert_static_member_fn (decl
);
3122 /* If this is a specialization of a member template of a
3123 template class, we want to return the TEMPLATE_DECL, not
3124 the specialization of it. */
3125 if (tsk
== tsk_template
&& !was_template_id
)
3127 tree result
= DECL_TEMPLATE_RESULT (tmpl
);
3128 SET_DECL_TEMPLATE_SPECIALIZATION (tmpl
);
3129 DECL_INITIAL (result
) = NULL_TREE
;
3133 DECL_SOURCE_LOCATION (tmpl
) = DECL_SOURCE_LOCATION (decl
);
3134 DECL_SOURCE_LOCATION (result
)
3135 = DECL_SOURCE_LOCATION (decl
);
3136 /* We want to use the argument list specified in the
3137 definition, not in the original declaration. */
3138 DECL_ARGUMENTS (result
) = DECL_ARGUMENTS (decl
);
3139 for (parm
= DECL_ARGUMENTS (result
); parm
;
3140 parm
= DECL_CHAIN (parm
))
3141 DECL_CONTEXT (parm
) = result
;
3143 return register_specialization (tmpl
, gen_tmpl
, targs
,
3147 /* Set up the DECL_TEMPLATE_INFO for DECL. */
3148 DECL_TEMPLATE_INFO (decl
) = build_template_info (tmpl
, targs
);
3150 if (was_template_id
)
3151 TINFO_USED_TEMPLATE_ID (DECL_TEMPLATE_INFO (decl
)) = true;
3153 /* Inherit default function arguments from the template
3154 DECL is specializing. */
3155 if (DECL_FUNCTION_TEMPLATE_P (tmpl
))
3156 copy_default_args_to_explicit_spec (decl
);
3158 /* This specialization has the same protection as the
3159 template it specializes. */
3160 TREE_PRIVATE (decl
) = TREE_PRIVATE (gen_tmpl
);
3161 TREE_PROTECTED (decl
) = TREE_PROTECTED (gen_tmpl
);
3163 /* 7.1.1-1 [dcl.stc]
3165 A storage-class-specifier shall not be specified in an
3166 explicit specialization...
3168 The parser rejects these, so unless action is taken here,
3169 explicit function specializations will always appear with
3172 The action recommended by the C++ CWG in response to C++
3173 defect report 605 is to make the storage class and linkage
3174 of the explicit specialization match the templated function:
3176 http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#605
3178 if (tsk
== tsk_expl_spec
&& DECL_FUNCTION_TEMPLATE_P (gen_tmpl
))
3180 tree tmpl_func
= DECL_TEMPLATE_RESULT (gen_tmpl
);
3181 gcc_assert (TREE_CODE (tmpl_func
) == FUNCTION_DECL
);
3183 /* A concept cannot be specialized. */
3184 if (DECL_DECLARED_CONCEPT_P (tmpl_func
))
3186 error ("explicit specialization of function concept %qD",
3188 return error_mark_node
;
3191 /* This specialization has the same linkage and visibility as
3192 the function template it specializes. */
3193 TREE_PUBLIC (decl
) = TREE_PUBLIC (tmpl_func
);
3194 if (! TREE_PUBLIC (decl
))
3196 DECL_INTERFACE_KNOWN (decl
) = 1;
3197 DECL_NOT_REALLY_EXTERN (decl
) = 1;
3199 DECL_THIS_STATIC (decl
) = DECL_THIS_STATIC (tmpl_func
);
3200 if (DECL_VISIBILITY_SPECIFIED (tmpl_func
))
3202 DECL_VISIBILITY_SPECIFIED (decl
) = 1;
3203 DECL_VISIBILITY (decl
) = DECL_VISIBILITY (tmpl_func
);
3207 /* If DECL is a friend declaration, declared using an
3208 unqualified name, the namespace associated with DECL may
3209 have been set incorrectly. For example, in:
3211 template <typename T> void f(T);
3213 struct S { friend void f<int>(int); }
3216 we will have set the DECL_CONTEXT for the friend
3217 declaration to N, rather than to the global namespace. */
3218 if (DECL_NAMESPACE_SCOPE_P (decl
))
3219 DECL_CONTEXT (decl
) = DECL_CONTEXT (tmpl
);
3221 if (is_friend
&& !have_def
)
3222 /* This is not really a declaration of a specialization.
3223 It's just the name of an instantiation. But, it's not
3224 a request for an instantiation, either. */
3225 SET_DECL_IMPLICIT_INSTANTIATION (decl
);
3226 else if (TREE_CODE (decl
) == FUNCTION_DECL
)
3227 /* A specialization is not necessarily COMDAT. */
3228 DECL_COMDAT (decl
) = (TREE_PUBLIC (decl
)
3229 && DECL_DECLARED_INLINE_P (decl
));
3230 else if (VAR_P (decl
))
3231 DECL_COMDAT (decl
) = false;
3233 /* If this is a full specialization, register it so that we can find
3234 it again. Partial specializations will be registered in
3235 process_partial_specialization. */
3236 if (!processing_template_decl
)
3238 warn_spec_missing_attributes (gen_tmpl
, decl
, attrlist
);
3240 decl
= register_specialization (decl
, gen_tmpl
, targs
,
3245 /* A 'structor should already have clones. */
3246 gcc_assert (decl
== error_mark_node
3247 || variable_template_p (tmpl
)
3248 || !(DECL_CONSTRUCTOR_P (decl
)
3249 || DECL_DESTRUCTOR_P (decl
))
3250 || DECL_CLONED_FUNCTION_P (DECL_CHAIN (decl
)));
3257 /* Returns 1 iff PARMS1 and PARMS2 are identical sets of template
3258 parameters. These are represented in the same format used for
3259 DECL_TEMPLATE_PARMS. */
3262 comp_template_parms (const_tree parms1
, const_tree parms2
)
3267 if (parms1
== parms2
)
3270 for (p1
= parms1
, p2
= parms2
;
3271 p1
!= NULL_TREE
&& p2
!= NULL_TREE
;
3272 p1
= TREE_CHAIN (p1
), p2
= TREE_CHAIN (p2
))
3274 tree t1
= TREE_VALUE (p1
);
3275 tree t2
= TREE_VALUE (p2
);
3278 gcc_assert (TREE_CODE (t1
) == TREE_VEC
);
3279 gcc_assert (TREE_CODE (t2
) == TREE_VEC
);
3281 if (TREE_VEC_LENGTH (t1
) != TREE_VEC_LENGTH (t2
))
3284 for (i
= 0; i
< TREE_VEC_LENGTH (t2
); ++i
)
3286 tree parm1
= TREE_VALUE (TREE_VEC_ELT (t1
, i
));
3287 tree parm2
= TREE_VALUE (TREE_VEC_ELT (t2
, i
));
3289 /* If either of the template parameters are invalid, assume
3290 they match for the sake of error recovery. */
3291 if (error_operand_p (parm1
) || error_operand_p (parm2
))
3294 if (TREE_CODE (parm1
) != TREE_CODE (parm2
))
3297 if (TREE_CODE (parm1
) == TEMPLATE_TYPE_PARM
3298 && (TEMPLATE_TYPE_PARAMETER_PACK (parm1
)
3299 == TEMPLATE_TYPE_PARAMETER_PACK (parm2
)))
3301 else if (!same_type_p (TREE_TYPE (parm1
), TREE_TYPE (parm2
)))
3306 if ((p1
!= NULL_TREE
) != (p2
!= NULL_TREE
))
3307 /* One set of parameters has more parameters lists than the
3314 /* Determine whether PARM is a parameter pack. */
3317 template_parameter_pack_p (const_tree parm
)
3319 /* Determine if we have a non-type template parameter pack. */
3320 if (TREE_CODE (parm
) == PARM_DECL
)
3321 return (DECL_TEMPLATE_PARM_P (parm
)
3322 && TEMPLATE_PARM_PARAMETER_PACK (DECL_INITIAL (parm
)));
3323 if (TREE_CODE (parm
) == TEMPLATE_PARM_INDEX
)
3324 return TEMPLATE_PARM_PARAMETER_PACK (parm
);
3326 /* If this is a list of template parameters, we could get a
3327 TYPE_DECL or a TEMPLATE_DECL. */
3328 if (TREE_CODE (parm
) == TYPE_DECL
|| TREE_CODE (parm
) == TEMPLATE_DECL
)
3329 parm
= TREE_TYPE (parm
);
3331 /* Otherwise it must be a type template parameter. */
3332 return ((TREE_CODE (parm
) == TEMPLATE_TYPE_PARM
3333 || TREE_CODE (parm
) == TEMPLATE_TEMPLATE_PARM
)
3334 && TEMPLATE_TYPE_PARAMETER_PACK (parm
));
3337 /* Determine if T is a function parameter pack. */
3340 function_parameter_pack_p (const_tree t
)
3342 if (t
&& TREE_CODE (t
) == PARM_DECL
)
3343 return DECL_PACK_P (t
);
3347 /* Return the function template declaration of PRIMARY_FUNC_TMPL_INST.
3348 PRIMARY_FUNC_TMPL_INST is a primary function template instantiation. */
3351 get_function_template_decl (const_tree primary_func_tmpl_inst
)
3353 if (! primary_func_tmpl_inst
3354 || TREE_CODE (primary_func_tmpl_inst
) != FUNCTION_DECL
3355 || ! primary_template_specialization_p (primary_func_tmpl_inst
))
3358 return DECL_TEMPLATE_RESULT (DECL_TI_TEMPLATE (primary_func_tmpl_inst
));
3361 /* Return true iff the function parameter PARAM_DECL was expanded
3362 from the function parameter pack PACK. */
3365 function_parameter_expanded_from_pack_p (tree param_decl
, tree pack
)
3367 if (DECL_ARTIFICIAL (param_decl
)
3368 || !function_parameter_pack_p (pack
))
3371 /* The parameter pack and its pack arguments have the same
3373 return DECL_PARM_INDEX (pack
) == DECL_PARM_INDEX (param_decl
);
3376 /* Determine whether ARGS describes a variadic template args list,
3377 i.e., one that is terminated by a template argument pack. */
3380 template_args_variadic_p (tree args
)
3385 if (args
== NULL_TREE
)
3388 args
= INNERMOST_TEMPLATE_ARGS (args
);
3389 nargs
= TREE_VEC_LENGTH (args
);
3394 last_parm
= TREE_VEC_ELT (args
, nargs
- 1);
3396 return ARGUMENT_PACK_P (last_parm
);
3399 /* Generate a new name for the parameter pack name NAME (an
3400 IDENTIFIER_NODE) that incorporates its */
3403 make_ith_pack_parameter_name (tree name
, int i
)
3405 /* Munge the name to include the parameter index. */
3406 #define NUMBUF_LEN 128
3407 char numbuf
[NUMBUF_LEN
];
3411 if (name
== NULL_TREE
)
3413 snprintf (numbuf
, NUMBUF_LEN
, "%i", i
);
3414 newname_len
= IDENTIFIER_LENGTH (name
)
3415 + strlen (numbuf
) + 2;
3416 newname
= (char*)alloca (newname_len
);
3417 snprintf (newname
, newname_len
,
3418 "%s#%i", IDENTIFIER_POINTER (name
), i
);
3419 return get_identifier (newname
);
3422 /* Return true if T is a primary function, class or alias template
3423 specialization, not including the template pattern. */
3426 primary_template_specialization_p (const_tree t
)
3431 if (TREE_CODE (t
) == FUNCTION_DECL
|| VAR_P (t
))
3432 return (DECL_LANG_SPECIFIC (t
)
3433 && DECL_USE_TEMPLATE (t
)
3434 && DECL_TEMPLATE_INFO (t
)
3435 && PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (t
)));
3436 else if (CLASS_TYPE_P (t
) && !TYPE_DECL_ALIAS_P (TYPE_NAME (t
)))
3437 return (CLASSTYPE_TEMPLATE_INFO (t
)
3438 && CLASSTYPE_USE_TEMPLATE (t
)
3439 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t
)));
3440 else if (alias_template_specialization_p (t
))
3445 /* Return true if PARM is a template template parameter. */
3448 template_template_parameter_p (const_tree parm
)
3450 return DECL_TEMPLATE_TEMPLATE_PARM_P (parm
);
3453 /* Return true iff PARM is a DECL representing a type template
3457 template_type_parameter_p (const_tree parm
)
3460 && (TREE_CODE (parm
) == TYPE_DECL
3461 || TREE_CODE (parm
) == TEMPLATE_DECL
)
3462 && DECL_TEMPLATE_PARM_P (parm
));
3465 /* Return the template parameters of T if T is a
3466 primary template instantiation, NULL otherwise. */
3469 get_primary_template_innermost_parameters (const_tree t
)
3471 tree parms
= NULL
, template_info
= NULL
;
3473 if ((template_info
= get_template_info (t
))
3474 && primary_template_specialization_p (t
))
3475 parms
= INNERMOST_TEMPLATE_PARMS
3476 (DECL_TEMPLATE_PARMS (TI_TEMPLATE (template_info
)));
3481 /* Return the template parameters of the LEVELth level from the full list
3482 of template parameters PARMS. */
3485 get_template_parms_at_level (tree parms
, int level
)
3489 || TREE_CODE (parms
) != TREE_LIST
3490 || level
> TMPL_PARMS_DEPTH (parms
))
3493 for (p
= parms
; p
; p
= TREE_CHAIN (p
))
3494 if (TMPL_PARMS_DEPTH (p
) == level
)
3500 /* Returns the template arguments of T if T is a template instantiation,
3504 get_template_innermost_arguments (const_tree t
)
3506 tree args
= NULL
, template_info
= NULL
;
3508 if ((template_info
= get_template_info (t
))
3509 && TI_ARGS (template_info
))
3510 args
= INNERMOST_TEMPLATE_ARGS (TI_ARGS (template_info
));
3515 /* Return the argument pack elements of T if T is a template argument pack,
3519 get_template_argument_pack_elems (const_tree t
)
3521 if (TREE_CODE (t
) != TYPE_ARGUMENT_PACK
3522 && TREE_CODE (t
) != NONTYPE_ARGUMENT_PACK
)
3525 return ARGUMENT_PACK_ARGS (t
);
3528 /* In an ARGUMENT_PACK_SELECT, the actual underlying argument that the
3529 ARGUMENT_PACK_SELECT represents. */
3532 argument_pack_select_arg (tree t
)
3534 tree args
= ARGUMENT_PACK_ARGS (ARGUMENT_PACK_SELECT_FROM_PACK (t
));
3535 tree arg
= TREE_VEC_ELT (args
, ARGUMENT_PACK_SELECT_INDEX (t
));
3537 /* If the selected argument is an expansion E, that most likely means we were
3538 called from gen_elem_of_pack_expansion_instantiation during the
3539 substituting of an argument pack (of which the Ith element is a pack
3540 expansion, where I is ARGUMENT_PACK_SELECT_INDEX) into a pack expansion.
3541 In this case, the Ith element resulting from this substituting is going to
3542 be a pack expansion, which pattern is the pattern of E. Let's return the
3543 pattern of E, and gen_elem_of_pack_expansion_instantiation will build the
3544 resulting pack expansion from it. */
3545 if (PACK_EXPANSION_P (arg
))
3547 /* Make sure we aren't throwing away arg info. */
3548 gcc_assert (!PACK_EXPANSION_EXTRA_ARGS (arg
));
3549 arg
= PACK_EXPANSION_PATTERN (arg
);
3556 /* True iff FN is a function representing a built-in variadic parameter
3560 builtin_pack_fn_p (tree fn
)
3563 || TREE_CODE (fn
) != FUNCTION_DECL
3564 || !DECL_IS_BUILTIN (fn
))
3567 if (id_equal (DECL_NAME (fn
), "__integer_pack"))
3573 /* True iff CALL is a call to a function representing a built-in variadic
3577 builtin_pack_call_p (tree call
)
3579 if (TREE_CODE (call
) != CALL_EXPR
)
3581 return builtin_pack_fn_p (CALL_EXPR_FN (call
));
3584 /* Return a TREE_VEC for the expansion of __integer_pack(HI). */
3587 expand_integer_pack (tree call
, tree args
, tsubst_flags_t complain
,
3590 tree ohi
= CALL_EXPR_ARG (call
, 0);
3591 tree hi
= tsubst_copy_and_build (ohi
, args
, complain
, in_decl
,
3592 false/*fn*/, true/*int_cst*/);
3594 if (value_dependent_expression_p (hi
))
3598 call
= copy_node (call
);
3599 CALL_EXPR_ARG (call
, 0) = hi
;
3601 tree ex
= make_pack_expansion (call
, complain
);
3602 tree vec
= make_tree_vec (1);
3603 TREE_VEC_ELT (vec
, 0) = ex
;
3608 hi
= cxx_constant_value (hi
);
3609 int len
= valid_constant_size_p (hi
) ? tree_to_shwi (hi
) : -1;
3611 /* Calculate the largest value of len that won't make the size of the vec
3612 overflow an int. The compiler will exceed resource limits long before
3613 this, but it seems a decent place to diagnose. */
3614 int max
= ((INT_MAX
- sizeof (tree_vec
)) / sizeof (tree
)) + 1;
3616 if (len
< 0 || len
> max
)
3618 if ((complain
& tf_error
)
3619 && hi
!= error_mark_node
)
3620 error ("argument to __integer_pack must be between 0 and %d", max
);
3621 return error_mark_node
;
3624 tree vec
= make_tree_vec (len
);
3626 for (int i
= 0; i
< len
; ++i
)
3627 TREE_VEC_ELT (vec
, i
) = size_int (i
);
3633 /* Return a TREE_VEC for the expansion of built-in template parameter pack
3637 expand_builtin_pack_call (tree call
, tree args
, tsubst_flags_t complain
,
3640 if (!builtin_pack_call_p (call
))
3643 tree fn
= CALL_EXPR_FN (call
);
3645 if (id_equal (DECL_NAME (fn
), "__integer_pack"))
3646 return expand_integer_pack (call
, args
, complain
, in_decl
);
3651 /* Structure used to track the progress of find_parameter_packs_r. */
3652 struct find_parameter_pack_data
3654 /* TREE_LIST that will contain all of the parameter packs found by
3656 tree
* parameter_packs
;
3658 /* Set of AST nodes that have been visited by the traversal. */
3659 hash_set
<tree
> *visited
;
3661 /* True iff we're making a type pack expansion. */
3662 bool type_pack_expansion_p
;
3665 /* Identifies all of the argument packs that occur in a template
3666 argument and appends them to the TREE_LIST inside DATA, which is a
3667 find_parameter_pack_data structure. This is a subroutine of
3668 make_pack_expansion and uses_parameter_packs. */
3670 find_parameter_packs_r (tree
*tp
, int *walk_subtrees
, void* data
)
3673 struct find_parameter_pack_data
* ppd
=
3674 (struct find_parameter_pack_data
*)data
;
3675 bool parameter_pack_p
= false;
3677 /* Handle type aliases/typedefs. */
3678 if (TYPE_ALIAS_P (t
))
3680 if (tree tinfo
= TYPE_ALIAS_TEMPLATE_INFO (t
))
3681 cp_walk_tree (&TI_ARGS (tinfo
),
3682 &find_parameter_packs_r
,
3688 /* Identify whether this is a parameter pack or not. */
3689 switch (TREE_CODE (t
))
3691 case TEMPLATE_PARM_INDEX
:
3692 if (TEMPLATE_PARM_PARAMETER_PACK (t
))
3693 parameter_pack_p
= true;
3696 case TEMPLATE_TYPE_PARM
:
3697 t
= TYPE_MAIN_VARIANT (t
);
3699 case TEMPLATE_TEMPLATE_PARM
:
3700 /* If the placeholder appears in the decl-specifier-seq of a function
3701 parameter pack (14.6.3), or the type-specifier-seq of a type-id that
3702 is a pack expansion, the invented template parameter is a template
3704 if (ppd
->type_pack_expansion_p
&& is_auto (t
))
3705 TEMPLATE_TYPE_PARAMETER_PACK (t
) = true;
3706 if (TEMPLATE_TYPE_PARAMETER_PACK (t
))
3707 parameter_pack_p
= true;
3712 if (DECL_PACK_P (t
))
3714 /* We don't want to walk into the type of a PARM_DECL,
3715 because we don't want to see the type parameter pack. */
3717 parameter_pack_p
= true;
3722 if (DECL_PACK_P (t
))
3724 /* We don't want to walk into the type of a variadic capture proxy,
3725 because we don't want to see the type parameter pack. */
3727 parameter_pack_p
= true;
3729 else if (variable_template_specialization_p (t
))
3731 cp_walk_tree (&DECL_TI_ARGS (t
),
3732 find_parameter_packs_r
,
3739 if (builtin_pack_call_p (t
))
3740 parameter_pack_p
= true;
3744 parameter_pack_p
= true;
3747 /* Not a parameter pack. */
3751 if (parameter_pack_p
)
3753 /* Add this parameter pack to the list. */
3754 *ppd
->parameter_packs
= tree_cons (NULL_TREE
, t
, *ppd
->parameter_packs
);
3758 cp_walk_tree (&TYPE_CONTEXT (t
),
3759 &find_parameter_packs_r
, ppd
, ppd
->visited
);
3761 /* This switch statement will return immediately if we don't find a
3763 switch (TREE_CODE (t
))
3765 case TEMPLATE_PARM_INDEX
:
3768 case BOUND_TEMPLATE_TEMPLATE_PARM
:
3769 /* Check the template itself. */
3770 cp_walk_tree (&TREE_TYPE (TYPE_TI_TEMPLATE (t
)),
3771 &find_parameter_packs_r
, ppd
, ppd
->visited
);
3772 /* Check the template arguments. */
3773 cp_walk_tree (&TYPE_TI_ARGS (t
), &find_parameter_packs_r
, ppd
,
3778 case TEMPLATE_TYPE_PARM
:
3779 case TEMPLATE_TEMPLATE_PARM
:
3786 /* Ignore the declaration of a capture proxy for a parameter pack. */
3787 if (is_capture_proxy (DECL_EXPR_DECL (t
)))
3792 if (TYPE_PTRMEMFUNC_P (t
))
3798 if (TYPE_TEMPLATE_INFO (t
))
3799 cp_walk_tree (&TYPE_TI_ARGS (t
),
3800 &find_parameter_packs_r
, ppd
, ppd
->visited
);
3806 if (!DECL_TEMPLATE_TEMPLATE_PARM_P (t
))
3811 cp_walk_tree (&TREE_TYPE (t
),
3812 &find_parameter_packs_r
, ppd
, ppd
->visited
);
3816 cp_walk_tree (&TYPENAME_TYPE_FULLNAME (t
), &find_parameter_packs_r
,
3821 case TYPE_PACK_EXPANSION
:
3822 case EXPR_PACK_EXPANSION
:
3827 cp_walk_tree (&TYPE_MAX_VALUE (t
), &find_parameter_packs_r
,
3832 case IDENTIFIER_NODE
:
3833 cp_walk_tree (&TREE_TYPE (t
), &find_parameter_packs_r
, ppd
,
3840 /* Look at explicit captures. */
3841 for (tree cap
= LAMBDA_EXPR_CAPTURE_LIST (t
);
3842 cap
; cap
= TREE_CHAIN (cap
))
3843 cp_walk_tree (&TREE_VALUE (cap
), &find_parameter_packs_r
, ppd
,
3845 /* Since we defer implicit capture, look in the body as well. */
3846 tree fn
= lambda_function (t
);
3847 cp_walk_tree (&DECL_SAVED_TREE (fn
), &find_parameter_packs_r
, ppd
,
3855 /* When traversing a DECLTYPE_TYPE_EXPR, we need to set
3856 type_pack_expansion_p to false so that any placeholders
3857 within the expression don't get marked as parameter packs. */
3858 bool type_pack_expansion_p
= ppd
->type_pack_expansion_p
;
3859 ppd
->type_pack_expansion_p
= false;
3860 cp_walk_tree (&DECLTYPE_TYPE_EXPR (t
), &find_parameter_packs_r
,
3862 ppd
->type_pack_expansion_p
= type_pack_expansion_p
;
3874 /* Determines if the expression or type T uses any parameter packs. */
3876 uses_parameter_packs (tree t
)
3878 tree parameter_packs
= NULL_TREE
;
3879 struct find_parameter_pack_data ppd
;
3880 ppd
.parameter_packs
= ¶meter_packs
;
3881 ppd
.visited
= new hash_set
<tree
>;
3882 ppd
.type_pack_expansion_p
= false;
3883 cp_walk_tree (&t
, &find_parameter_packs_r
, &ppd
, ppd
.visited
);
3885 return parameter_packs
!= NULL_TREE
;
3888 /* Turn ARG, which may be an expression, type, or a TREE_LIST
3889 representation a base-class initializer into a parameter pack
3890 expansion. If all goes well, the resulting node will be an
3891 EXPR_PACK_EXPANSION, TYPE_PACK_EXPANSION, or TREE_LIST,
3894 make_pack_expansion (tree arg
, tsubst_flags_t complain
)
3897 tree parameter_packs
= NULL_TREE
;
3898 bool for_types
= false;
3899 struct find_parameter_pack_data ppd
;
3901 if (!arg
|| arg
== error_mark_node
)
3904 if (TREE_CODE (arg
) == TREE_LIST
&& TREE_PURPOSE (arg
))
3906 /* A TREE_LIST with a non-null TREE_PURPOSE is for a base
3907 class initializer. In this case, the TREE_PURPOSE will be a
3908 _TYPE node (representing the base class expansion we're
3909 initializing) and the TREE_VALUE will be a TREE_LIST
3910 containing the initialization arguments.
3912 The resulting expansion looks somewhat different from most
3913 expansions. Rather than returning just one _EXPANSION, we
3914 return a TREE_LIST whose TREE_PURPOSE is a
3915 TYPE_PACK_EXPANSION containing the bases that will be
3916 initialized. The TREE_VALUE will be identical to the
3917 original TREE_VALUE, which is a list of arguments that will
3918 be passed to each base. We do not introduce any new pack
3919 expansion nodes into the TREE_VALUE (although it is possible
3920 that some already exist), because the TREE_PURPOSE and
3921 TREE_VALUE all need to be expanded together with the same
3922 _EXPANSION node. Note that the TYPE_PACK_EXPANSION in the
3923 resulting TREE_PURPOSE will mention the parameter packs in
3924 both the bases and the arguments to the bases. */
3927 tree parameter_packs
= NULL_TREE
;
3929 /* Determine which parameter packs will be used by the base
3931 ppd
.visited
= new hash_set
<tree
>;
3932 ppd
.parameter_packs
= ¶meter_packs
;
3933 ppd
.type_pack_expansion_p
= true;
3934 gcc_assert (TYPE_P (TREE_PURPOSE (arg
)));
3935 cp_walk_tree (&TREE_PURPOSE (arg
), &find_parameter_packs_r
,
3938 if (parameter_packs
== NULL_TREE
)
3940 if (complain
& tf_error
)
3941 error ("base initializer expansion %qT contains no parameter packs",
3944 return error_mark_node
;
3947 if (TREE_VALUE (arg
) != void_type_node
)
3949 /* Collect the sets of parameter packs used in each of the
3950 initialization arguments. */
3951 for (value
= TREE_VALUE (arg
); value
; value
= TREE_CHAIN (value
))
3953 /* Determine which parameter packs will be expanded in this
3955 cp_walk_tree (&TREE_VALUE (value
), &find_parameter_packs_r
,
3962 /* Create the pack expansion type for the base type. */
3963 purpose
= cxx_make_type (TYPE_PACK_EXPANSION
);
3964 SET_PACK_EXPANSION_PATTERN (purpose
, TREE_PURPOSE (arg
));
3965 PACK_EXPANSION_PARAMETER_PACKS (purpose
) = parameter_packs
;
3966 PACK_EXPANSION_LOCAL_P (purpose
) = at_function_scope_p ();
3968 /* Just use structural equality for these TYPE_PACK_EXPANSIONS;
3969 they will rarely be compared to anything. */
3970 SET_TYPE_STRUCTURAL_EQUALITY (purpose
);
3972 return tree_cons (purpose
, TREE_VALUE (arg
), NULL_TREE
);
3975 if (TYPE_P (arg
) || TREE_CODE (arg
) == TEMPLATE_DECL
)
3978 /* Build the PACK_EXPANSION_* node. */
3980 ? cxx_make_type (TYPE_PACK_EXPANSION
)
3981 : make_node (EXPR_PACK_EXPANSION
);
3982 SET_PACK_EXPANSION_PATTERN (result
, arg
);
3983 if (TREE_CODE (result
) == EXPR_PACK_EXPANSION
)
3985 /* Propagate type and const-expression information. */
3986 TREE_TYPE (result
) = TREE_TYPE (arg
);
3987 TREE_CONSTANT (result
) = TREE_CONSTANT (arg
);
3988 /* Mark this read now, since the expansion might be length 0. */
3989 mark_exp_read (arg
);
3992 /* Just use structural equality for these TYPE_PACK_EXPANSIONS;
3993 they will rarely be compared to anything. */
3994 SET_TYPE_STRUCTURAL_EQUALITY (result
);
3996 /* Determine which parameter packs will be expanded. */
3997 ppd
.parameter_packs
= ¶meter_packs
;
3998 ppd
.visited
= new hash_set
<tree
>;
3999 ppd
.type_pack_expansion_p
= TYPE_P (arg
);
4000 cp_walk_tree (&arg
, &find_parameter_packs_r
, &ppd
, ppd
.visited
);
4003 /* Make sure we found some parameter packs. */
4004 if (parameter_packs
== NULL_TREE
)
4006 if (complain
& tf_error
)
4009 error ("expansion pattern %qT contains no argument packs", arg
);
4011 error ("expansion pattern %qE contains no argument packs", arg
);
4013 return error_mark_node
;
4015 PACK_EXPANSION_PARAMETER_PACKS (result
) = parameter_packs
;
4017 PACK_EXPANSION_LOCAL_P (result
) = at_function_scope_p ();
4022 /* Checks T for any "bare" parameter packs, which have not yet been
4023 expanded, and issues an error if any are found. This operation can
4024 only be done on full expressions or types (e.g., an expression
4025 statement, "if" condition, etc.), because we could have expressions like:
4027 foo(f(g(h(args)))...)
4029 where "args" is a parameter pack. check_for_bare_parameter_packs
4030 should not be called for the subexpressions args, h(args),
4031 g(h(args)), or f(g(h(args))), because we would produce erroneous
4034 Returns TRUE and emits an error if there were bare parameter packs,
4035 returns FALSE otherwise. */
4037 check_for_bare_parameter_packs (tree t
)
4039 tree parameter_packs
= NULL_TREE
;
4040 struct find_parameter_pack_data ppd
;
4042 if (!processing_template_decl
|| !t
|| t
== error_mark_node
)
4045 /* A lambda might use a parameter pack from the containing context. */
4046 if (current_class_type
&& LAMBDA_TYPE_P (current_class_type
)
4047 && CLASSTYPE_TEMPLATE_INFO (current_class_type
))
4050 if (TREE_CODE (t
) == TYPE_DECL
)
4053 ppd
.parameter_packs
= ¶meter_packs
;
4054 ppd
.visited
= new hash_set
<tree
>;
4055 ppd
.type_pack_expansion_p
= false;
4056 cp_walk_tree (&t
, &find_parameter_packs_r
, &ppd
, ppd
.visited
);
4059 if (parameter_packs
)
4061 location_t loc
= EXPR_LOC_OR_LOC (t
, input_location
);
4062 error_at (loc
, "parameter packs not expanded with %<...%>:");
4063 while (parameter_packs
)
4065 tree pack
= TREE_VALUE (parameter_packs
);
4066 tree name
= NULL_TREE
;
4068 if (TREE_CODE (pack
) == TEMPLATE_TYPE_PARM
4069 || TREE_CODE (pack
) == TEMPLATE_TEMPLATE_PARM
)
4070 name
= TYPE_NAME (pack
);
4071 else if (TREE_CODE (pack
) == TEMPLATE_PARM_INDEX
)
4072 name
= DECL_NAME (TEMPLATE_PARM_DECL (pack
));
4073 else if (TREE_CODE (pack
) == CALL_EXPR
)
4074 name
= DECL_NAME (CALL_EXPR_FN (pack
));
4076 name
= DECL_NAME (pack
);
4079 inform (loc
, " %qD", name
);
4081 inform (loc
, " <anonymous>");
4083 parameter_packs
= TREE_CHAIN (parameter_packs
);
4092 /* Expand any parameter packs that occur in the template arguments in
4095 expand_template_argument_pack (tree args
)
4097 if (args
== error_mark_node
)
4098 return error_mark_node
;
4100 tree result_args
= NULL_TREE
;
4101 int in_arg
, out_arg
= 0, nargs
= args
? TREE_VEC_LENGTH (args
) : 0;
4102 int num_result_args
= -1;
4103 int non_default_args_count
= -1;
4105 /* First, determine if we need to expand anything, and the number of
4106 slots we'll need. */
4107 for (in_arg
= 0; in_arg
< nargs
; ++in_arg
)
4109 tree arg
= TREE_VEC_ELT (args
, in_arg
);
4110 if (arg
== NULL_TREE
)
4112 if (ARGUMENT_PACK_P (arg
))
4114 int num_packed
= TREE_VEC_LENGTH (ARGUMENT_PACK_ARGS (arg
));
4115 if (num_result_args
< 0)
4116 num_result_args
= in_arg
+ num_packed
;
4118 num_result_args
+= num_packed
;
4122 if (num_result_args
>= 0)
4127 /* If no expansion is necessary, we're done. */
4128 if (num_result_args
< 0)
4131 /* Expand arguments. */
4132 result_args
= make_tree_vec (num_result_args
);
4133 if (NON_DEFAULT_TEMPLATE_ARGS_COUNT (args
))
4134 non_default_args_count
=
4135 GET_NON_DEFAULT_TEMPLATE_ARGS_COUNT (args
);
4136 for (in_arg
= 0; in_arg
< nargs
; ++in_arg
)
4138 tree arg
= TREE_VEC_ELT (args
, in_arg
);
4139 if (ARGUMENT_PACK_P (arg
))
4141 tree packed
= ARGUMENT_PACK_ARGS (arg
);
4142 int i
, num_packed
= TREE_VEC_LENGTH (packed
);
4143 for (i
= 0; i
< num_packed
; ++i
, ++out_arg
)
4144 TREE_VEC_ELT (result_args
, out_arg
) = TREE_VEC_ELT(packed
, i
);
4145 if (non_default_args_count
> 0)
4146 non_default_args_count
+= num_packed
- 1;
4150 TREE_VEC_ELT (result_args
, out_arg
) = arg
;
4154 if (non_default_args_count
>= 0)
4155 SET_NON_DEFAULT_TEMPLATE_ARGS_COUNT (result_args
, non_default_args_count
);
4159 /* Checks if DECL shadows a template parameter.
4161 [temp.local]: A template-parameter shall not be redeclared within its
4162 scope (including nested scopes).
4164 Emits an error and returns TRUE if the DECL shadows a parameter,
4165 returns FALSE otherwise. */
4168 check_template_shadow (tree decl
)
4172 /* If we're not in a template, we can't possibly shadow a template
4174 if (!current_template_parms
)
4177 /* Figure out what we're shadowing. */
4178 decl
= OVL_FIRST (decl
);
4179 olddecl
= innermost_non_namespace_value (DECL_NAME (decl
));
4181 /* If there's no previous binding for this name, we're not shadowing
4182 anything, let alone a template parameter. */
4186 /* If we're not shadowing a template parameter, we're done. Note
4187 that OLDDECL might be an OVERLOAD (or perhaps even an
4188 ERROR_MARK), so we can't just blithely assume it to be a _DECL
4190 if (!DECL_P (olddecl
) || !DECL_TEMPLATE_PARM_P (olddecl
))
4193 /* We check for decl != olddecl to avoid bogus errors for using a
4194 name inside a class. We check TPFI to avoid duplicate errors for
4195 inline member templates. */
4197 || (DECL_TEMPLATE_PARM_P (decl
)
4198 && TEMPLATE_PARMS_FOR_INLINE (current_template_parms
)))
4201 /* Don't complain about the injected class name, as we've already
4202 complained about the class itself. */
4203 if (DECL_SELF_REFERENCE_P (decl
))
4206 if (DECL_TEMPLATE_PARM_P (decl
))
4207 error ("declaration of template parameter %q+D shadows "
4208 "template parameter", decl
);
4210 error ("declaration of %q+#D shadows template parameter", decl
);
4211 inform (DECL_SOURCE_LOCATION (olddecl
),
4212 "template parameter %qD declared here", olddecl
);
4216 /* Return a new TEMPLATE_PARM_INDEX with the indicated INDEX, LEVEL,
4217 ORIG_LEVEL, DECL, and TYPE. */
4220 build_template_parm_index (int index
,
4226 tree t
= make_node (TEMPLATE_PARM_INDEX
);
4227 TEMPLATE_PARM_IDX (t
) = index
;
4228 TEMPLATE_PARM_LEVEL (t
) = level
;
4229 TEMPLATE_PARM_ORIG_LEVEL (t
) = orig_level
;
4230 TEMPLATE_PARM_DECL (t
) = decl
;
4231 TREE_TYPE (t
) = type
;
4232 TREE_CONSTANT (t
) = TREE_CONSTANT (decl
);
4233 TREE_READONLY (t
) = TREE_READONLY (decl
);
4238 /* Find the canonical type parameter for the given template type
4239 parameter. Returns the canonical type parameter, which may be TYPE
4240 if no such parameter existed. */
4243 canonical_type_parameter (tree type
)
4246 int idx
= TEMPLATE_TYPE_IDX (type
);
4247 if (!canonical_template_parms
)
4248 vec_alloc (canonical_template_parms
, idx
+ 1);
4250 if (canonical_template_parms
->length () <= (unsigned) idx
)
4251 vec_safe_grow_cleared (canonical_template_parms
, idx
+ 1);
4253 list
= (*canonical_template_parms
)[idx
];
4254 while (list
&& !comptypes (type
, TREE_VALUE (list
), COMPARE_STRUCTURAL
))
4255 list
= TREE_CHAIN (list
);
4258 return TREE_VALUE (list
);
4261 (*canonical_template_parms
)[idx
]
4262 = tree_cons (NULL_TREE
, type
, (*canonical_template_parms
)[idx
]);
4267 /* Return a TEMPLATE_PARM_INDEX, similar to INDEX, but whose
4268 TEMPLATE_PARM_LEVEL has been decreased by LEVELS. If such a
4269 TEMPLATE_PARM_INDEX already exists, it is returned; otherwise, a
4270 new one is created. */
4273 reduce_template_parm_level (tree index
, tree type
, int levels
, tree args
,
4274 tsubst_flags_t complain
)
4276 if (TEMPLATE_PARM_DESCENDANTS (index
) == NULL_TREE
4277 || (TEMPLATE_PARM_LEVEL (TEMPLATE_PARM_DESCENDANTS (index
))
4278 != TEMPLATE_PARM_LEVEL (index
) - levels
)
4279 || !same_type_p (type
, TREE_TYPE (TEMPLATE_PARM_DESCENDANTS (index
))))
4281 tree orig_decl
= TEMPLATE_PARM_DECL (index
);
4284 decl
= build_decl (DECL_SOURCE_LOCATION (orig_decl
),
4285 TREE_CODE (orig_decl
), DECL_NAME (orig_decl
), type
);
4286 TREE_CONSTANT (decl
) = TREE_CONSTANT (orig_decl
);
4287 TREE_READONLY (decl
) = TREE_READONLY (orig_decl
);
4288 DECL_ARTIFICIAL (decl
) = 1;
4289 SET_DECL_TEMPLATE_PARM_P (decl
);
4291 t
= build_template_parm_index (TEMPLATE_PARM_IDX (index
),
4292 TEMPLATE_PARM_LEVEL (index
) - levels
,
4293 TEMPLATE_PARM_ORIG_LEVEL (index
),
4295 TEMPLATE_PARM_DESCENDANTS (index
) = t
;
4296 TEMPLATE_PARM_PARAMETER_PACK (t
)
4297 = TEMPLATE_PARM_PARAMETER_PACK (index
);
4299 /* Template template parameters need this. */
4300 if (TREE_CODE (decl
) == TEMPLATE_DECL
)
4302 DECL_TEMPLATE_RESULT (decl
)
4303 = build_decl (DECL_SOURCE_LOCATION (decl
),
4304 TYPE_DECL
, DECL_NAME (decl
), type
);
4305 DECL_ARTIFICIAL (DECL_TEMPLATE_RESULT (decl
)) = true;
4306 DECL_TEMPLATE_PARMS (decl
) = tsubst_template_parms
4307 (DECL_TEMPLATE_PARMS (orig_decl
), args
, complain
);
4311 return TEMPLATE_PARM_DESCENDANTS (index
);
4314 /* Process information from new template parameter PARM and append it
4315 to the LIST being built. This new parameter is a non-type
4316 parameter iff IS_NON_TYPE is true. This new parameter is a
4317 parameter pack iff IS_PARAMETER_PACK is true. The location of PARM
4321 process_template_parm (tree list
, location_t parm_loc
, tree parm
,
4322 bool is_non_type
, bool is_parameter_pack
)
4327 gcc_assert (TREE_CODE (parm
) == TREE_LIST
);
4328 tree defval
= TREE_PURPOSE (parm
);
4329 tree constr
= TREE_TYPE (parm
);
4333 tree p
= tree_last (list
);
4335 if (p
&& TREE_VALUE (p
) != error_mark_node
)
4338 if (TREE_CODE (p
) == TYPE_DECL
|| TREE_CODE (p
) == TEMPLATE_DECL
)
4339 idx
= TEMPLATE_TYPE_IDX (TREE_TYPE (p
));
4341 idx
= TEMPLATE_PARM_IDX (DECL_INITIAL (p
));
4349 parm
= TREE_VALUE (parm
);
4351 SET_DECL_TEMPLATE_PARM_P (parm
);
4353 if (TREE_TYPE (parm
) != error_mark_node
)
4357 The top-level cv-qualifiers on the template-parameter are
4358 ignored when determining its type. */
4359 TREE_TYPE (parm
) = TYPE_MAIN_VARIANT (TREE_TYPE (parm
));
4360 if (invalid_nontype_parm_type_p (TREE_TYPE (parm
), 1))
4361 TREE_TYPE (parm
) = error_mark_node
;
4362 else if (uses_parameter_packs (TREE_TYPE (parm
))
4363 && !is_parameter_pack
4364 /* If we're in a nested template parameter list, the template
4365 template parameter could be a parameter pack. */
4366 && processing_template_parmlist
== 1)
4368 /* This template parameter is not a parameter pack, but it
4369 should be. Complain about "bare" parameter packs. */
4370 check_for_bare_parameter_packs (TREE_TYPE (parm
));
4372 /* Recover by calling this a parameter pack. */
4373 is_parameter_pack
= true;
4377 /* A template parameter is not modifiable. */
4378 TREE_CONSTANT (parm
) = 1;
4379 TREE_READONLY (parm
) = 1;
4380 decl
= build_decl (parm_loc
,
4381 CONST_DECL
, DECL_NAME (parm
), TREE_TYPE (parm
));
4382 TREE_CONSTANT (decl
) = 1;
4383 TREE_READONLY (decl
) = 1;
4384 DECL_INITIAL (parm
) = DECL_INITIAL (decl
)
4385 = build_template_parm_index (idx
, processing_template_decl
,
4386 processing_template_decl
,
4387 decl
, TREE_TYPE (parm
));
4389 TEMPLATE_PARM_PARAMETER_PACK (DECL_INITIAL (parm
))
4390 = is_parameter_pack
;
4395 parm
= TREE_VALUE (TREE_VALUE (parm
));
4397 if (parm
&& TREE_CODE (parm
) == TEMPLATE_DECL
)
4399 t
= cxx_make_type (TEMPLATE_TEMPLATE_PARM
);
4400 /* This is for distinguishing between real templates and template
4401 template parameters */
4402 TREE_TYPE (parm
) = t
;
4403 TREE_TYPE (DECL_TEMPLATE_RESULT (parm
)) = t
;
4408 t
= cxx_make_type (TEMPLATE_TYPE_PARM
);
4409 /* parm is either IDENTIFIER_NODE or NULL_TREE. */
4410 decl
= build_decl (parm_loc
,
4411 TYPE_DECL
, parm
, t
);
4414 TYPE_NAME (t
) = decl
;
4415 TYPE_STUB_DECL (t
) = decl
;
4417 TEMPLATE_TYPE_PARM_INDEX (t
)
4418 = build_template_parm_index (idx
, processing_template_decl
,
4419 processing_template_decl
,
4420 decl
, TREE_TYPE (parm
));
4421 TEMPLATE_TYPE_PARAMETER_PACK (t
) = is_parameter_pack
;
4422 TYPE_CANONICAL (t
) = canonical_type_parameter (t
);
4424 DECL_ARTIFICIAL (decl
) = 1;
4425 SET_DECL_TEMPLATE_PARM_P (decl
);
4427 /* Build requirements for the type/template parameter.
4428 This must be done after SET_DECL_TEMPLATE_PARM_P or
4429 process_template_parm could fail. */
4430 tree reqs
= finish_shorthand_constraint (parm
, constr
);
4434 if (defval
&& TREE_CODE (defval
) == OVERLOAD
)
4435 lookup_keep (defval
, true);
4437 /* Build the parameter node linking the parameter declaration,
4438 its default argument (if any), and its constraints (if any). */
4439 parm
= build_tree_list (defval
, parm
);
4440 TEMPLATE_PARM_CONSTRAINTS (parm
) = reqs
;
4442 return chainon (list
, parm
);
4445 /* The end of a template parameter list has been reached. Process the
4446 tree list into a parameter vector, converting each parameter into a more
4447 useful form. Type parameters are saved as IDENTIFIER_NODEs, and others
4451 end_template_parm_list (tree parms
)
4455 tree saved_parmlist
= make_tree_vec (list_length (parms
));
4457 /* Pop the dummy parameter level and add the real one. */
4458 current_template_parms
= TREE_CHAIN (current_template_parms
);
4460 current_template_parms
4461 = tree_cons (size_int (processing_template_decl
),
4462 saved_parmlist
, current_template_parms
);
4464 for (parm
= parms
, nparms
= 0; parm
; parm
= next
, nparms
++)
4466 next
= TREE_CHAIN (parm
);
4467 TREE_VEC_ELT (saved_parmlist
, nparms
) = parm
;
4468 TREE_CHAIN (parm
) = NULL_TREE
;
4471 --processing_template_parmlist
;
4473 return saved_parmlist
;
4476 // Explicitly indicate the end of the template parameter list. We assume
4477 // that the current template parameters have been constructed and/or
4478 // managed explicitly, as when creating new template template parameters
4479 // from a shorthand constraint.
4481 end_template_parm_list ()
4483 --processing_template_parmlist
;
4486 /* end_template_decl is called after a template declaration is seen. */
4489 end_template_decl (void)
4491 reset_specialization ();
4493 if (! processing_template_decl
)
4496 /* This matches the pushlevel in begin_template_parm_list. */
4499 --processing_template_decl
;
4500 current_template_parms
= TREE_CHAIN (current_template_parms
);
4503 /* Takes a TREE_LIST representing a template parameter and convert it
4504 into an argument suitable to be passed to the type substitution
4505 functions. Note that If the TREE_LIST contains an error_mark
4506 node, the returned argument is error_mark_node. */
4509 template_parm_to_arg (tree t
)
4513 || TREE_CODE (t
) != TREE_LIST
)
4516 if (error_operand_p (TREE_VALUE (t
)))
4517 return error_mark_node
;
4521 if (TREE_CODE (t
) == TYPE_DECL
4522 || TREE_CODE (t
) == TEMPLATE_DECL
)
4526 if (TEMPLATE_TYPE_PARAMETER_PACK (t
))
4528 /* Turn this argument into a TYPE_ARGUMENT_PACK
4529 with a single element, which expands T. */
4530 tree vec
= make_tree_vec (1);
4532 SET_NON_DEFAULT_TEMPLATE_ARGS_COUNT (vec
, TREE_VEC_LENGTH (vec
));
4534 TREE_VEC_ELT (vec
, 0) = make_pack_expansion (t
);
4536 t
= cxx_make_type (TYPE_ARGUMENT_PACK
);
4537 SET_ARGUMENT_PACK_ARGS (t
, vec
);
4542 t
= DECL_INITIAL (t
);
4544 if (TEMPLATE_PARM_PARAMETER_PACK (t
))
4546 /* Turn this argument into a NONTYPE_ARGUMENT_PACK
4547 with a single element, which expands T. */
4548 tree vec
= make_tree_vec (1);
4550 SET_NON_DEFAULT_TEMPLATE_ARGS_COUNT (vec
, TREE_VEC_LENGTH (vec
));
4552 t
= convert_from_reference (t
);
4553 TREE_VEC_ELT (vec
, 0) = make_pack_expansion (t
);
4555 t
= make_node (NONTYPE_ARGUMENT_PACK
);
4556 SET_ARGUMENT_PACK_ARGS (t
, vec
);
4559 t
= convert_from_reference (t
);
4564 /* Given a single level of template parameters (a TREE_VEC), return it
4565 as a set of template arguments. */
4568 template_parms_level_to_args (tree parms
)
4570 tree a
= copy_node (parms
);
4571 TREE_TYPE (a
) = NULL_TREE
;
4572 for (int i
= TREE_VEC_LENGTH (a
) - 1; i
>= 0; --i
)
4573 TREE_VEC_ELT (a
, i
) = template_parm_to_arg (TREE_VEC_ELT (a
, i
));
4576 SET_NON_DEFAULT_TEMPLATE_ARGS_COUNT (a
, TREE_VEC_LENGTH (a
));
4581 /* Given a set of template parameters, return them as a set of template
4582 arguments. The template parameters are represented as a TREE_VEC, in
4583 the form documented in cp-tree.h for template arguments. */
4586 template_parms_to_args (tree parms
)
4589 tree args
= NULL_TREE
;
4590 int length
= TMPL_PARMS_DEPTH (parms
);
4593 /* If there is only one level of template parameters, we do not
4594 create a TREE_VEC of TREE_VECs. Instead, we return a single
4595 TREE_VEC containing the arguments. */
4597 args
= make_tree_vec (length
);
4599 for (header
= parms
; header
; header
= TREE_CHAIN (header
))
4601 tree a
= template_parms_level_to_args (TREE_VALUE (header
));
4604 TREE_VEC_ELT (args
, --l
) = a
;
4612 /* Within the declaration of a template, return the currently active
4613 template parameters as an argument TREE_VEC. */
4616 current_template_args (void)
4618 return template_parms_to_args (current_template_parms
);
4621 /* Update the declared TYPE by doing any lookups which were thought to be
4622 dependent, but are not now that we know the SCOPE of the declarator. */
4625 maybe_update_decl_type (tree orig_type
, tree scope
)
4627 tree type
= orig_type
;
4629 if (type
== NULL_TREE
)
4632 if (TREE_CODE (orig_type
) == TYPE_DECL
)
4633 type
= TREE_TYPE (type
);
4635 if (scope
&& TYPE_P (scope
) && dependent_type_p (scope
)
4636 && dependent_type_p (type
)
4637 /* Don't bother building up the args in this case. */
4638 && TREE_CODE (type
) != TEMPLATE_TYPE_PARM
)
4640 /* tsubst in the args corresponding to the template parameters,
4641 including auto if present. Most things will be unchanged, but
4642 make_typename_type and tsubst_qualified_id will resolve
4643 TYPENAME_TYPEs and SCOPE_REFs that were previously dependent. */
4644 tree args
= current_template_args ();
4645 tree auto_node
= type_uses_auto (type
);
4649 tree auto_vec
= make_tree_vec (1);
4650 TREE_VEC_ELT (auto_vec
, 0) = auto_node
;
4651 args
= add_to_template_args (args
, auto_vec
);
4653 pushed
= push_scope (scope
);
4654 type
= tsubst (type
, args
, tf_warning_or_error
, NULL_TREE
);
4659 if (type
== error_mark_node
)
4662 if (TREE_CODE (orig_type
) == TYPE_DECL
)
4664 if (same_type_p (type
, TREE_TYPE (orig_type
)))
4667 type
= TYPE_NAME (type
);
4672 /* Return a TEMPLATE_DECL corresponding to DECL, using the indicated
4673 template PARMS and constraints, CONSTR. If MEMBER_TEMPLATE_P is true,
4674 the new template is a member template. */
4677 build_template_decl (tree decl
, tree parms
, bool member_template_p
)
4679 tree tmpl
= build_lang_decl (TEMPLATE_DECL
, DECL_NAME (decl
), NULL_TREE
);
4680 SET_DECL_LANGUAGE (tmpl
, DECL_LANGUAGE (decl
));
4681 DECL_TEMPLATE_PARMS (tmpl
) = parms
;
4682 DECL_CONTEXT (tmpl
) = DECL_CONTEXT (decl
);
4683 DECL_SOURCE_LOCATION (tmpl
) = DECL_SOURCE_LOCATION (decl
);
4684 DECL_MEMBER_TEMPLATE_P (tmpl
) = member_template_p
;
4689 struct template_parm_data
4691 /* The level of the template parameters we are currently
4695 /* The index of the specialization argument we are currently
4699 /* An array whose size is the number of template parameters. The
4700 elements are nonzero if the parameter has been used in any one
4701 of the arguments processed so far. */
4704 /* An array whose size is the number of template arguments. The
4705 elements are nonzero if the argument makes use of template
4706 parameters of this level. */
4707 int* arg_uses_template_parms
;
4710 /* Subroutine of push_template_decl used to see if each template
4711 parameter in a partial specialization is used in the explicit
4712 argument list. If T is of the LEVEL given in DATA (which is
4713 treated as a template_parm_data*), then DATA->PARMS is marked
4717 mark_template_parm (tree t
, void* data
)
4721 struct template_parm_data
* tpd
= (struct template_parm_data
*) data
;
4723 template_parm_level_and_index (t
, &level
, &idx
);
4725 if (level
== tpd
->level
)
4727 tpd
->parms
[idx
] = 1;
4728 tpd
->arg_uses_template_parms
[tpd
->current_arg
] = 1;
4731 /* In C++17 the type of a non-type argument is a deduced context. */
4732 if (cxx_dialect
>= cxx17
4733 && TREE_CODE (t
) == TEMPLATE_PARM_INDEX
)
4734 for_each_template_parm (TREE_TYPE (t
),
4735 &mark_template_parm
,
4738 /*include_nondeduced_p=*/false);
4740 /* Return zero so that for_each_template_parm will continue the
4741 traversal of the tree; we want to mark *every* template parm. */
4745 /* Process the partial specialization DECL. */
4748 process_partial_specialization (tree decl
)
4750 tree type
= TREE_TYPE (decl
);
4751 tree tinfo
= get_template_info (decl
);
4752 tree maintmpl
= TI_TEMPLATE (tinfo
);
4753 tree specargs
= TI_ARGS (tinfo
);
4754 tree inner_args
= INNERMOST_TEMPLATE_ARGS (specargs
);
4755 tree main_inner_parms
= DECL_INNERMOST_TEMPLATE_PARMS (maintmpl
);
4758 int nargs
= TREE_VEC_LENGTH (inner_args
);
4761 bool did_error_intro
= false;
4762 struct template_parm_data tpd
;
4763 struct template_parm_data tpd2
;
4765 gcc_assert (current_template_parms
);
4767 /* A concept cannot be specialized. */
4768 if (flag_concepts
&& variable_concept_p (maintmpl
))
4770 error ("specialization of variable concept %q#D", maintmpl
);
4771 return error_mark_node
;
4774 inner_parms
= INNERMOST_TEMPLATE_PARMS (current_template_parms
);
4775 ntparms
= TREE_VEC_LENGTH (inner_parms
);
4777 /* We check that each of the template parameters given in the
4778 partial specialization is used in the argument list to the
4779 specialization. For example:
4781 template <class T> struct S;
4782 template <class T> struct S<T*>;
4784 The second declaration is OK because `T*' uses the template
4785 parameter T, whereas
4787 template <class T> struct S<int>;
4789 is no good. Even trickier is:
4800 The S2<T> declaration is actually invalid; it is a
4801 full-specialization. Of course,
4804 struct S2<T (*)(U)>;
4806 or some such would have been OK. */
4807 tpd
.level
= TMPL_PARMS_DEPTH (current_template_parms
);
4808 tpd
.parms
= XALLOCAVEC (int, ntparms
);
4809 memset (tpd
.parms
, 0, sizeof (int) * ntparms
);
4811 tpd
.arg_uses_template_parms
= XALLOCAVEC (int, nargs
);
4812 memset (tpd
.arg_uses_template_parms
, 0, sizeof (int) * nargs
);
4813 for (i
= 0; i
< nargs
; ++i
)
4815 tpd
.current_arg
= i
;
4816 for_each_template_parm (TREE_VEC_ELT (inner_args
, i
),
4817 &mark_template_parm
,
4820 /*include_nondeduced_p=*/false);
4822 for (i
= 0; i
< ntparms
; ++i
)
4823 if (tpd
.parms
[i
] == 0)
4825 /* One of the template parms was not used in a deduced context in the
4827 if (!did_error_intro
)
4829 error ("template parameters not deducible in "
4830 "partial specialization:");
4831 did_error_intro
= true;
4834 inform (input_location
, " %qD",
4835 TREE_VALUE (TREE_VEC_ELT (inner_parms
, i
)));
4838 if (did_error_intro
)
4839 return error_mark_node
;
4841 /* [temp.class.spec]
4843 The argument list of the specialization shall not be identical to
4844 the implicit argument list of the primary template. */
4846 = TI_ARGS (get_template_info (DECL_TEMPLATE_RESULT (maintmpl
)));
4847 if (comp_template_args (inner_args
, INNERMOST_TEMPLATE_ARGS (main_args
))
4849 || !strictly_subsumes (current_template_constraints (),
4850 get_constraints (maintmpl
))))
4853 error ("partial specialization %q+D does not specialize "
4854 "any template arguments; to define the primary template, "
4855 "remove the template argument list", decl
);
4857 error ("partial specialization %q+D does not specialize any "
4858 "template arguments and is not more constrained than "
4859 "the primary template; to define the primary template, "
4860 "remove the template argument list", decl
);
4861 inform (DECL_SOURCE_LOCATION (maintmpl
), "primary template here");
4864 /* A partial specialization that replaces multiple parameters of the
4865 primary template with a pack expansion is less specialized for those
4867 if (nargs
< DECL_NTPARMS (maintmpl
))
4869 error ("partial specialization is not more specialized than the "
4870 "primary template because it replaces multiple parameters "
4871 "with a pack expansion");
4872 inform (DECL_SOURCE_LOCATION (maintmpl
), "primary template here");
4873 /* Avoid crash in process_partial_specialization. */
4877 /* If we aren't in a dependent class, we can actually try deduction. */
4878 else if (tpd
.level
== 1
4879 /* FIXME we should be able to handle a partial specialization of a
4880 partial instantiation, but currently we can't (c++/41727). */
4881 && TMPL_ARGS_DEPTH (specargs
) == 1
4882 && !get_partial_spec_bindings (maintmpl
, maintmpl
, specargs
))
4884 if (permerror (input_location
, "partial specialization %qD is not "
4885 "more specialized than", decl
))
4886 inform (DECL_SOURCE_LOCATION (maintmpl
), "primary template %qD",
4890 /* [temp.class.spec]
4892 A partially specialized non-type argument expression shall not
4893 involve template parameters of the partial specialization except
4894 when the argument expression is a simple identifier.
4896 The type of a template parameter corresponding to a specialized
4897 non-type argument shall not be dependent on a parameter of the
4900 Also, we verify that pack expansions only occur at the
4901 end of the argument list. */
4902 gcc_assert (nargs
== DECL_NTPARMS (maintmpl
));
4904 for (i
= 0; i
< nargs
; ++i
)
4906 tree parm
= TREE_VALUE (TREE_VEC_ELT (main_inner_parms
, i
));
4907 tree arg
= TREE_VEC_ELT (inner_args
, i
);
4908 tree packed_args
= NULL_TREE
;
4911 if (ARGUMENT_PACK_P (arg
))
4913 /* Extract the arguments from the argument pack. We'll be
4914 iterating over these in the following loop. */
4915 packed_args
= ARGUMENT_PACK_ARGS (arg
);
4916 len
= TREE_VEC_LENGTH (packed_args
);
4919 for (j
= 0; j
< len
; j
++)
4922 /* Get the Jth argument in the parameter pack. */
4923 arg
= TREE_VEC_ELT (packed_args
, j
);
4925 if (PACK_EXPANSION_P (arg
))
4927 /* Pack expansions must come at the end of the
4929 if ((packed_args
&& j
< len
- 1)
4930 || (!packed_args
&& i
< nargs
- 1))
4932 if (TREE_CODE (arg
) == EXPR_PACK_EXPANSION
)
4933 error ("parameter pack argument %qE must be at the "
4934 "end of the template argument list", arg
);
4936 error ("parameter pack argument %qT must be at the "
4937 "end of the template argument list", arg
);
4941 if (TREE_CODE (arg
) == EXPR_PACK_EXPANSION
)
4942 /* We only care about the pattern. */
4943 arg
= PACK_EXPANSION_PATTERN (arg
);
4945 if (/* These first two lines are the `non-type' bit. */
4947 && TREE_CODE (arg
) != TEMPLATE_DECL
4948 /* This next two lines are the `argument expression is not just a
4949 simple identifier' condition and also the `specialized
4950 non-type argument' bit. */
4951 && TREE_CODE (arg
) != TEMPLATE_PARM_INDEX
4952 && !(REFERENCE_REF_P (arg
)
4953 && TREE_CODE (TREE_OPERAND (arg
, 0)) == TEMPLATE_PARM_INDEX
))
4955 if ((!packed_args
&& tpd
.arg_uses_template_parms
[i
])
4956 || (packed_args
&& uses_template_parms (arg
)))
4957 error ("template argument %qE involves template parameter(s)",
4961 /* Look at the corresponding template parameter,
4962 marking which template parameters its type depends
4964 tree type
= TREE_TYPE (parm
);
4968 /* We haven't yet initialized TPD2. Do so now. */
4969 tpd2
.arg_uses_template_parms
= XALLOCAVEC (int, nargs
);
4970 /* The number of parameters here is the number in the
4971 main template, which, as checked in the assertion
4973 tpd2
.parms
= XALLOCAVEC (int, nargs
);
4975 TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (maintmpl
));
4978 /* Mark the template parameters. But this time, we're
4979 looking for the template parameters of the main
4980 template, not in the specialization. */
4981 tpd2
.current_arg
= i
;
4982 tpd2
.arg_uses_template_parms
[i
] = 0;
4983 memset (tpd2
.parms
, 0, sizeof (int) * nargs
);
4984 for_each_template_parm (type
,
4985 &mark_template_parm
,
4988 /*include_nondeduced_p=*/false);
4990 if (tpd2
.arg_uses_template_parms
[i
])
4992 /* The type depended on some template parameters.
4993 If they are fully specialized in the
4994 specialization, that's OK. */
4997 for (j
= 0; j
< nargs
; ++j
)
4998 if (tpd2
.parms
[j
] != 0
4999 && tpd
.arg_uses_template_parms
[j
])
5002 error_n (input_location
, count
,
5003 "type %qT of template argument %qE depends "
5004 "on a template parameter",
5005 "type %qT of template argument %qE depends "
5006 "on template parameters",
5015 /* We should only get here once. */
5016 if (TREE_CODE (decl
) == TYPE_DECL
)
5017 gcc_assert (!COMPLETE_TYPE_P (type
));
5019 // Build the template decl.
5020 tree tmpl
= build_template_decl (decl
, current_template_parms
,
5021 DECL_MEMBER_TEMPLATE_P (maintmpl
));
5022 TREE_TYPE (tmpl
) = type
;
5023 DECL_TEMPLATE_RESULT (tmpl
) = decl
;
5024 SET_DECL_TEMPLATE_SPECIALIZATION (tmpl
);
5025 DECL_TEMPLATE_INFO (tmpl
) = build_template_info (maintmpl
, specargs
);
5026 DECL_PRIMARY_TEMPLATE (tmpl
) = maintmpl
;
5028 /* Give template template parms a DECL_CONTEXT of the template
5029 for which they are a parameter. */
5030 for (i
= 0; i
< ntparms
; ++i
)
5032 tree parm
= TREE_VALUE (TREE_VEC_ELT (inner_parms
, i
));
5033 if (TREE_CODE (parm
) == TEMPLATE_DECL
)
5034 DECL_CONTEXT (parm
) = tmpl
;
5038 /* We didn't register this in check_explicit_specialization so we could
5039 wait until the constraints were set. */
5040 decl
= register_specialization (decl
, maintmpl
, specargs
, false, 0);
5042 associate_classtype_constraints (type
);
5044 DECL_TEMPLATE_SPECIALIZATIONS (maintmpl
)
5045 = tree_cons (specargs
, tmpl
,
5046 DECL_TEMPLATE_SPECIALIZATIONS (maintmpl
));
5047 TREE_TYPE (DECL_TEMPLATE_SPECIALIZATIONS (maintmpl
)) = type
;
5049 for (inst
= DECL_TEMPLATE_INSTANTIATIONS (maintmpl
); inst
;
5050 inst
= TREE_CHAIN (inst
))
5052 tree instance
= TREE_VALUE (inst
);
5053 if (TYPE_P (instance
)
5054 ? (COMPLETE_TYPE_P (instance
)
5055 && CLASSTYPE_IMPLICIT_INSTANTIATION (instance
))
5056 : DECL_TEMPLATE_INSTANTIATION (instance
))
5058 tree spec
= most_specialized_partial_spec (instance
, tf_none
);
5059 tree inst_decl
= (DECL_P (instance
)
5060 ? instance
: TYPE_NAME (instance
));
5063 else if (spec
== error_mark_node
)
5064 permerror (input_location
,
5065 "declaration of %qD ambiguates earlier template "
5066 "instantiation for %qD", decl
, inst_decl
);
5067 else if (TREE_VALUE (spec
) == tmpl
)
5068 permerror (input_location
,
5069 "partial specialization of %qD after instantiation "
5070 "of %qD", decl
, inst_decl
);
5077 /* PARM is a template parameter of some form; return the corresponding
5078 TEMPLATE_PARM_INDEX. */
5081 get_template_parm_index (tree parm
)
5083 if (TREE_CODE (parm
) == PARM_DECL
5084 || TREE_CODE (parm
) == CONST_DECL
)
5085 parm
= DECL_INITIAL (parm
);
5086 else if (TREE_CODE (parm
) == TYPE_DECL
5087 || TREE_CODE (parm
) == TEMPLATE_DECL
)
5088 parm
= TREE_TYPE (parm
);
5089 if (TREE_CODE (parm
) == TEMPLATE_TYPE_PARM
5090 || TREE_CODE (parm
) == BOUND_TEMPLATE_TEMPLATE_PARM
5091 || TREE_CODE (parm
) == TEMPLATE_TEMPLATE_PARM
)
5092 parm
= TEMPLATE_TYPE_PARM_INDEX (parm
);
5093 gcc_assert (TREE_CODE (parm
) == TEMPLATE_PARM_INDEX
);
5097 /* Subroutine of fixed_parameter_pack_p below. Look for any template
5098 parameter packs used by the template parameter PARM. */
5101 fixed_parameter_pack_p_1 (tree parm
, struct find_parameter_pack_data
*ppd
)
5103 /* A type parm can't refer to another parm. */
5104 if (TREE_CODE (parm
) == TYPE_DECL
)
5106 else if (TREE_CODE (parm
) == PARM_DECL
)
5108 cp_walk_tree (&TREE_TYPE (parm
), &find_parameter_packs_r
,
5113 gcc_assert (TREE_CODE (parm
) == TEMPLATE_DECL
);
5115 tree vec
= INNERMOST_TEMPLATE_PARMS (DECL_TEMPLATE_PARMS (parm
));
5116 for (int i
= 0; i
< TREE_VEC_LENGTH (vec
); ++i
)
5117 fixed_parameter_pack_p_1 (TREE_VALUE (TREE_VEC_ELT (vec
, i
)), ppd
);
5120 /* PARM is a template parameter pack. Return any parameter packs used in
5121 its type or the type of any of its template parameters. If there are
5122 any such packs, it will be instantiated into a fixed template parameter
5123 list by partial instantiation rather than be fully deduced. */
5126 fixed_parameter_pack_p (tree parm
)
5128 /* This can only be true in a member template. */
5129 if (TEMPLATE_PARM_ORIG_LEVEL (get_template_parm_index (parm
)) < 2)
5131 /* This can only be true for a parameter pack. */
5132 if (!template_parameter_pack_p (parm
))
5134 /* A type parm can't refer to another parm. */
5135 if (TREE_CODE (parm
) == TYPE_DECL
)
5138 tree parameter_packs
= NULL_TREE
;
5139 struct find_parameter_pack_data ppd
;
5140 ppd
.parameter_packs
= ¶meter_packs
;
5141 ppd
.visited
= new hash_set
<tree
>;
5142 ppd
.type_pack_expansion_p
= false;
5144 fixed_parameter_pack_p_1 (parm
, &ppd
);
5147 return parameter_packs
;
5150 /* Check that a template declaration's use of default arguments and
5151 parameter packs is not invalid. Here, PARMS are the template
5152 parameters. IS_PRIMARY is true if DECL is the thing declared by
5153 a primary template. IS_PARTIAL is true if DECL is a partial
5156 IS_FRIEND_DECL is nonzero if DECL is either a non-defining friend
5157 function template declaration or a friend class template
5158 declaration. In the function case, 1 indicates a declaration, 2
5159 indicates a redeclaration. When IS_FRIEND_DECL=2, no errors are
5160 emitted for extraneous default arguments.
5162 Returns TRUE if there were no errors found, FALSE otherwise. */
5165 check_default_tmpl_args (tree decl
, tree parms
, bool is_primary
,
5166 bool is_partial
, int is_friend_decl
)
5169 int last_level_to_check
;
5171 bool no_errors
= true;
5175 A default template-argument shall not be specified in a
5176 function template declaration or a function template definition, nor
5177 in the template-parameter-list of the definition of a member of a
5180 if (TREE_CODE (CP_DECL_CONTEXT (decl
)) == FUNCTION_DECL
5181 || (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_LOCAL_FUNCTION_P (decl
)))
5182 /* You can't have a function template declaration in a local
5183 scope, nor you can you define a member of a class template in a
5187 if ((TREE_CODE (decl
) == TYPE_DECL
5189 && LAMBDA_TYPE_P (TREE_TYPE (decl
)))
5190 || (TREE_CODE (decl
) == FUNCTION_DECL
5191 && LAMBDA_FUNCTION_P (decl
)))
5192 /* A lambda doesn't have an explicit declaration; don't complain
5193 about the parms of the enclosing class. */
5196 if (current_class_type
5197 && !TYPE_BEING_DEFINED (current_class_type
)
5198 && DECL_LANG_SPECIFIC (decl
)
5199 && DECL_DECLARES_FUNCTION_P (decl
)
5200 /* If this is either a friend defined in the scope of the class
5201 or a member function. */
5202 && (DECL_FUNCTION_MEMBER_P (decl
)
5203 ? same_type_p (DECL_CONTEXT (decl
), current_class_type
)
5204 : DECL_FRIEND_CONTEXT (decl
)
5205 ? same_type_p (DECL_FRIEND_CONTEXT (decl
), current_class_type
)
5207 /* And, if it was a member function, it really was defined in
5208 the scope of the class. */
5209 && (!DECL_FUNCTION_MEMBER_P (decl
)
5210 || DECL_INITIALIZED_IN_CLASS_P (decl
)))
5211 /* We already checked these parameters when the template was
5212 declared, so there's no need to do it again now. This function
5213 was defined in class scope, but we're processing its body now
5214 that the class is complete. */
5217 /* Core issue 226 (C++0x only): the following only applies to class
5220 && ((cxx_dialect
== cxx98
) || TREE_CODE (decl
) != FUNCTION_DECL
))
5224 If a template-parameter has a default template-argument, all
5225 subsequent template-parameters shall have a default
5226 template-argument supplied. */
5227 for (parm_level
= parms
; parm_level
; parm_level
= TREE_CHAIN (parm_level
))
5229 tree inner_parms
= TREE_VALUE (parm_level
);
5230 int ntparms
= TREE_VEC_LENGTH (inner_parms
);
5231 int seen_def_arg_p
= 0;
5234 for (i
= 0; i
< ntparms
; ++i
)
5236 tree parm
= TREE_VEC_ELT (inner_parms
, i
);
5238 if (parm
== error_mark_node
)
5241 if (TREE_PURPOSE (parm
))
5243 else if (seen_def_arg_p
5244 && !template_parameter_pack_p (TREE_VALUE (parm
)))
5246 error ("no default argument for %qD", TREE_VALUE (parm
));
5247 /* For better subsequent error-recovery, we indicate that
5248 there should have been a default argument. */
5249 TREE_PURPOSE (parm
) = error_mark_node
;
5252 else if (!is_partial
5254 /* Don't complain about an enclosing partial
5256 && parm_level
== parms
5257 && TREE_CODE (decl
) == TYPE_DECL
5259 && template_parameter_pack_p (TREE_VALUE (parm
))
5260 /* A fixed parameter pack will be partially
5261 instantiated into a fixed length list. */
5262 && !fixed_parameter_pack_p (TREE_VALUE (parm
)))
5264 /* A primary class template can only have one
5265 parameter pack, at the end of the template
5268 error ("parameter pack %q+D must be at the end of the"
5269 " template parameter list", TREE_VALUE (parm
));
5271 TREE_VALUE (TREE_VEC_ELT (inner_parms
, i
))
5279 if (((cxx_dialect
== cxx98
) && TREE_CODE (decl
) != TYPE_DECL
)
5283 /* For an ordinary class template, default template arguments are
5284 allowed at the innermost level, e.g.:
5285 template <class T = int>
5287 but, in a partial specialization, they're not allowed even
5288 there, as we have in [temp.class.spec]:
5290 The template parameter list of a specialization shall not
5291 contain default template argument values.
5293 So, for a partial specialization, or for a function template
5294 (in C++98/C++03), we look at all of them. */
5297 /* But, for a primary class template that is not a partial
5298 specialization we look at all template parameters except the
5300 parms
= TREE_CHAIN (parms
);
5302 /* Figure out what error message to issue. */
5303 if (is_friend_decl
== 2)
5304 msg
= G_("default template arguments may not be used in function template "
5305 "friend re-declaration");
5306 else if (is_friend_decl
)
5307 msg
= G_("default template arguments may not be used in template "
5308 "friend declarations");
5309 else if (TREE_CODE (decl
) == FUNCTION_DECL
&& (cxx_dialect
== cxx98
))
5310 msg
= G_("default template arguments may not be used in function templates "
5311 "without -std=c++11 or -std=gnu++11");
5312 else if (is_partial
)
5313 msg
= G_("default template arguments may not be used in "
5314 "partial specializations");
5315 else if (current_class_type
&& CLASSTYPE_IS_TEMPLATE (current_class_type
))
5316 msg
= G_("default argument for template parameter for class enclosing %qD");
5318 /* Per [temp.param]/9, "A default template-argument shall not be
5319 specified in the template-parameter-lists of the definition of
5320 a member of a class template that appears outside of the member's
5321 class.", thus if we aren't handling a member of a class template
5322 there is no need to examine the parameters. */
5325 if (current_class_type
&& TYPE_BEING_DEFINED (current_class_type
))
5326 /* If we're inside a class definition, there's no need to
5327 examine the parameters to the class itself. On the one
5328 hand, they will be checked when the class is defined, and,
5329 on the other, default arguments are valid in things like:
5330 template <class T = double>
5331 struct S { template <class U> void f(U); };
5332 Here the default argument for `S' has no bearing on the
5333 declaration of `f'. */
5334 last_level_to_check
= template_class_depth (current_class_type
) + 1;
5336 /* Check everything. */
5337 last_level_to_check
= 0;
5339 for (parm_level
= parms
;
5340 parm_level
&& TMPL_PARMS_DEPTH (parm_level
) >= last_level_to_check
;
5341 parm_level
= TREE_CHAIN (parm_level
))
5343 tree inner_parms
= TREE_VALUE (parm_level
);
5347 ntparms
= TREE_VEC_LENGTH (inner_parms
);
5348 for (i
= 0; i
< ntparms
; ++i
)
5350 if (TREE_VEC_ELT (inner_parms
, i
) == error_mark_node
)
5353 if (TREE_PURPOSE (TREE_VEC_ELT (inner_parms
, i
)))
5358 if (is_friend_decl
== 2)
5365 /* Clear out the default argument so that we are not
5367 TREE_PURPOSE (TREE_VEC_ELT (inner_parms
, i
)) = NULL_TREE
;
5371 /* At this point, if we're still interested in issuing messages,
5372 they must apply to classes surrounding the object declared. */
5374 msg
= G_("default argument for template parameter for class "
5381 /* Worker for push_template_decl_real, called via
5382 for_each_template_parm. DATA is really an int, indicating the
5383 level of the parameters we are interested in. If T is a template
5384 parameter of that level, return nonzero. */
5387 template_parm_this_level_p (tree t
, void* data
)
5389 int this_level
= *(int *)data
;
5392 if (TREE_CODE (t
) == TEMPLATE_PARM_INDEX
)
5393 level
= TEMPLATE_PARM_LEVEL (t
);
5395 level
= TEMPLATE_TYPE_LEVEL (t
);
5396 return level
== this_level
;
5399 /* Worker for uses_outer_template_parms, called via for_each_template_parm.
5400 DATA is really an int, indicating the innermost outer level of parameters.
5401 If T is a template parameter of that level or further out, return
5405 template_parm_outer_level (tree t
, void *data
)
5407 int this_level
= *(int *)data
;
5410 if (TREE_CODE (t
) == TEMPLATE_PARM_INDEX
)
5411 level
= TEMPLATE_PARM_LEVEL (t
);
5413 level
= TEMPLATE_TYPE_LEVEL (t
);
5414 return level
<= this_level
;
5417 /* Creates a TEMPLATE_DECL for the indicated DECL using the template
5418 parameters given by current_template_args, or reuses a
5419 previously existing one, if appropriate. Returns the DECL, or an
5420 equivalent one, if it is replaced via a call to duplicate_decls.
5422 If IS_FRIEND is true, DECL is a friend declaration. */
5425 push_template_decl_real (tree decl
, bool is_friend
)
5433 int new_template_p
= 0;
5434 /* True if the template is a member template, in the sense of
5436 bool member_template_p
= false;
5438 if (decl
== error_mark_node
|| !current_template_parms
)
5439 return error_mark_node
;
5441 /* See if this is a partial specialization. */
5442 is_partial
= ((DECL_IMPLICIT_TYPEDEF_P (decl
)
5443 && TREE_CODE (TREE_TYPE (decl
)) != ENUMERAL_TYPE
5444 && CLASSTYPE_TEMPLATE_SPECIALIZATION (TREE_TYPE (decl
)))
5446 && DECL_LANG_SPECIFIC (decl
)
5447 && DECL_TEMPLATE_SPECIALIZATION (decl
)
5448 && TINFO_USED_TEMPLATE_ID (DECL_TEMPLATE_INFO (decl
))));
5450 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_FRIEND_P (decl
))
5454 /* For a friend, we want the context of the friend, not
5455 the type of which it is a friend. */
5456 ctx
= CP_DECL_CONTEXT (decl
);
5457 else if (CP_DECL_CONTEXT (decl
)
5458 && TREE_CODE (CP_DECL_CONTEXT (decl
)) != NAMESPACE_DECL
)
5459 /* In the case of a virtual function, we want the class in which
5461 ctx
= CP_DECL_CONTEXT (decl
);
5463 /* Otherwise, if we're currently defining some class, the DECL
5464 is assumed to be a member of the class. */
5465 ctx
= current_scope ();
5467 if (ctx
&& TREE_CODE (ctx
) == NAMESPACE_DECL
)
5470 if (!DECL_CONTEXT (decl
))
5471 DECL_CONTEXT (decl
) = FROB_CONTEXT (current_namespace
);
5473 /* See if this is a primary template. */
5474 if (is_friend
&& ctx
5475 && uses_template_parms_level (ctx
, processing_template_decl
))
5476 /* A friend template that specifies a class context, i.e.
5477 template <typename T> friend void A<T>::f();
5480 else if (TREE_CODE (decl
) == TYPE_DECL
5481 && LAMBDA_TYPE_P (TREE_TYPE (decl
)))
5484 is_primary
= template_parm_scope_p ();
5488 warning (OPT_Wtemplates
, "template %qD declared", decl
);
5490 if (DECL_CLASS_SCOPE_P (decl
))
5491 member_template_p
= true;
5492 if (TREE_CODE (decl
) == TYPE_DECL
5493 && anon_aggrname_p (DECL_NAME (decl
)))
5495 error ("template class without a name");
5496 return error_mark_node
;
5498 else if (TREE_CODE (decl
) == FUNCTION_DECL
)
5500 if (member_template_p
)
5502 if (DECL_OVERRIDE_P (decl
) || DECL_FINAL_P (decl
))
5503 error ("member template %qD may not have virt-specifiers", decl
);
5505 if (DECL_DESTRUCTOR_P (decl
))
5509 A destructor shall not be a member template. */
5510 error ("destructor %qD declared as member template", decl
);
5511 return error_mark_node
;
5513 if (IDENTIFIER_NEWDEL_OP_P (DECL_NAME (decl
))
5514 && (!prototype_p (TREE_TYPE (decl
))
5515 || TYPE_ARG_TYPES (TREE_TYPE (decl
)) == void_list_node
5516 || !TREE_CHAIN (TYPE_ARG_TYPES (TREE_TYPE (decl
)))
5517 || (TREE_CHAIN (TYPE_ARG_TYPES (TREE_TYPE (decl
)))
5518 == void_list_node
)))
5520 /* [basic.stc.dynamic.allocation]
5522 An allocation function can be a function
5523 template. ... Template allocation functions shall
5524 have two or more parameters. */
5525 error ("invalid template declaration of %qD", decl
);
5526 return error_mark_node
;
5529 else if (DECL_IMPLICIT_TYPEDEF_P (decl
)
5530 && CLASS_TYPE_P (TREE_TYPE (decl
)))
5532 /* Class template, set TEMPLATE_TYPE_PARM_FOR_CLASS. */
5533 tree parms
= INNERMOST_TEMPLATE_PARMS (current_template_parms
);
5534 for (int i
= 0; i
< TREE_VEC_LENGTH (parms
); ++i
)
5536 tree t
= TREE_VALUE (TREE_VEC_ELT (parms
, i
));
5537 if (TREE_CODE (t
) == TYPE_DECL
)
5539 if (TREE_CODE (t
) == TEMPLATE_TYPE_PARM
)
5540 TEMPLATE_TYPE_PARM_FOR_CLASS (t
) = true;
5543 else if (TREE_CODE (decl
) == TYPE_DECL
5544 && TYPE_DECL_ALIAS_P (decl
))
5545 /* alias-declaration */
5546 gcc_assert (!DECL_ARTIFICIAL (decl
));
5547 else if (VAR_P (decl
))
5548 /* C++14 variable template. */;
5551 error ("template declaration of %q#D", decl
);
5552 return error_mark_node
;
5556 /* Check to see that the rules regarding the use of default
5557 arguments are not being violated. We check args for a friend
5558 functions when we know whether it's a definition, introducing
5559 declaration or re-declaration. */
5560 if (!is_friend
|| TREE_CODE (decl
) != FUNCTION_DECL
)
5561 check_default_tmpl_args (decl
, current_template_parms
,
5562 is_primary
, is_partial
, is_friend
);
5564 /* Ensure that there are no parameter packs in the type of this
5565 declaration that have not been expanded. */
5566 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5568 /* Check each of the arguments individually to see if there are
5569 any bare parameter packs. */
5570 tree type
= TREE_TYPE (decl
);
5571 tree arg
= DECL_ARGUMENTS (decl
);
5572 tree argtype
= TYPE_ARG_TYPES (type
);
5574 while (arg
&& argtype
)
5576 if (!DECL_PACK_P (arg
)
5577 && check_for_bare_parameter_packs (TREE_TYPE (arg
)))
5579 /* This is a PARM_DECL that contains unexpanded parameter
5580 packs. We have already complained about this in the
5581 check_for_bare_parameter_packs call, so just replace
5582 these types with ERROR_MARK_NODE. */
5583 TREE_TYPE (arg
) = error_mark_node
;
5584 TREE_VALUE (argtype
) = error_mark_node
;
5587 arg
= DECL_CHAIN (arg
);
5588 argtype
= TREE_CHAIN (argtype
);
5591 /* Check for bare parameter packs in the return type and the
5592 exception specifiers. */
5593 if (check_for_bare_parameter_packs (TREE_TYPE (type
)))
5594 /* Errors were already issued, set return type to int
5595 as the frontend doesn't expect error_mark_node as
5597 TREE_TYPE (type
) = integer_type_node
;
5598 if (check_for_bare_parameter_packs (TYPE_RAISES_EXCEPTIONS (type
)))
5599 TYPE_RAISES_EXCEPTIONS (type
) = NULL_TREE
;
5601 else if (check_for_bare_parameter_packs ((TREE_CODE (decl
) == TYPE_DECL
5602 && TYPE_DECL_ALIAS_P (decl
))
5603 ? DECL_ORIGINAL_TYPE (decl
)
5604 : TREE_TYPE (decl
)))
5606 TREE_TYPE (decl
) = error_mark_node
;
5607 return error_mark_node
;
5611 return process_partial_specialization (decl
);
5613 args
= current_template_args ();
5616 || TREE_CODE (ctx
) == FUNCTION_DECL
5617 || (CLASS_TYPE_P (ctx
) && TYPE_BEING_DEFINED (ctx
))
5618 || (TREE_CODE (decl
) == TYPE_DECL
5619 && LAMBDA_TYPE_P (TREE_TYPE (decl
)))
5620 || (is_friend
&& !DECL_TEMPLATE_INFO (decl
)))
5622 if (DECL_LANG_SPECIFIC (decl
)
5623 && DECL_TEMPLATE_INFO (decl
)
5624 && DECL_TI_TEMPLATE (decl
))
5625 tmpl
= DECL_TI_TEMPLATE (decl
);
5626 /* If DECL is a TYPE_DECL for a class-template, then there won't
5627 be DECL_LANG_SPECIFIC. The information equivalent to
5628 DECL_TEMPLATE_INFO is found in TYPE_TEMPLATE_INFO instead. */
5629 else if (DECL_IMPLICIT_TYPEDEF_P (decl
)
5630 && TYPE_TEMPLATE_INFO (TREE_TYPE (decl
))
5631 && TYPE_TI_TEMPLATE (TREE_TYPE (decl
)))
5633 /* Since a template declaration already existed for this
5634 class-type, we must be redeclaring it here. Make sure
5635 that the redeclaration is valid. */
5636 redeclare_class_template (TREE_TYPE (decl
),
5637 current_template_parms
,
5638 current_template_constraints ());
5639 /* We don't need to create a new TEMPLATE_DECL; just use the
5640 one we already had. */
5641 tmpl
= TYPE_TI_TEMPLATE (TREE_TYPE (decl
));
5645 tmpl
= build_template_decl (decl
, current_template_parms
,
5649 if (DECL_LANG_SPECIFIC (decl
)
5650 && DECL_TEMPLATE_SPECIALIZATION (decl
))
5652 /* A specialization of a member template of a template
5654 SET_DECL_TEMPLATE_SPECIALIZATION (tmpl
);
5655 DECL_TEMPLATE_INFO (tmpl
) = DECL_TEMPLATE_INFO (decl
);
5656 DECL_TEMPLATE_INFO (decl
) = NULL_TREE
;
5662 tree a
, t
, current
, parms
;
5664 tree tinfo
= get_template_info (decl
);
5668 error ("template definition of non-template %q#D", decl
);
5669 return error_mark_node
;
5672 tmpl
= TI_TEMPLATE (tinfo
);
5674 if (DECL_FUNCTION_TEMPLATE_P (tmpl
)
5675 && DECL_TEMPLATE_INFO (decl
) && DECL_TI_ARGS (decl
)
5676 && DECL_TEMPLATE_SPECIALIZATION (decl
)
5677 && DECL_MEMBER_TEMPLATE_P (tmpl
))
5681 /* The declaration is a specialization of a member
5682 template, declared outside the class. Therefore, the
5683 innermost template arguments will be NULL, so we
5684 replace them with the arguments determined by the
5685 earlier call to check_explicit_specialization. */
5686 args
= DECL_TI_ARGS (decl
);
5689 = build_template_decl (decl
, current_template_parms
,
5691 DECL_TEMPLATE_RESULT (new_tmpl
) = decl
;
5692 TREE_TYPE (new_tmpl
) = TREE_TYPE (decl
);
5693 DECL_TI_TEMPLATE (decl
) = new_tmpl
;
5694 SET_DECL_TEMPLATE_SPECIALIZATION (new_tmpl
);
5695 DECL_TEMPLATE_INFO (new_tmpl
)
5696 = build_template_info (tmpl
, args
);
5698 register_specialization (new_tmpl
,
5699 most_general_template (tmpl
),
5705 /* Make sure the template headers we got make sense. */
5707 parms
= DECL_TEMPLATE_PARMS (tmpl
);
5708 i
= TMPL_PARMS_DEPTH (parms
);
5709 if (TMPL_ARGS_DEPTH (args
) != i
)
5711 error ("expected %d levels of template parms for %q#D, got %d",
5712 i
, decl
, TMPL_ARGS_DEPTH (args
));
5713 DECL_INTERFACE_KNOWN (decl
) = 1;
5714 return error_mark_node
;
5717 for (current
= decl
; i
> 0; --i
, parms
= TREE_CHAIN (parms
))
5719 a
= TMPL_ARGS_LEVEL (args
, i
);
5720 t
= INNERMOST_TEMPLATE_PARMS (parms
);
5722 if (TREE_VEC_LENGTH (t
) != TREE_VEC_LENGTH (a
))
5724 if (current
== decl
)
5725 error ("got %d template parameters for %q#D",
5726 TREE_VEC_LENGTH (a
), decl
);
5728 error ("got %d template parameters for %q#T",
5729 TREE_VEC_LENGTH (a
), current
);
5730 error (" but %d required", TREE_VEC_LENGTH (t
));
5731 /* Avoid crash in import_export_decl. */
5732 DECL_INTERFACE_KNOWN (decl
) = 1;
5733 return error_mark_node
;
5736 if (current
== decl
)
5738 else if (current
== NULL_TREE
)
5739 /* Can happen in erroneous input. */
5742 current
= get_containing_scope (current
);
5745 /* Check that the parms are used in the appropriate qualifying scopes
5746 in the declarator. */
5747 if (!comp_template_args
5749 TI_ARGS (get_template_info (DECL_TEMPLATE_RESULT (tmpl
)))))
5751 error ("template arguments to %qD do not match original "
5752 "template %qD", decl
, DECL_TEMPLATE_RESULT (tmpl
));
5753 if (!uses_template_parms (TI_ARGS (tinfo
)))
5754 inform (input_location
, "use %<template<>%> for"
5755 " an explicit specialization");
5756 /* Avoid crash in import_export_decl. */
5757 DECL_INTERFACE_KNOWN (decl
) = 1;
5758 return error_mark_node
;
5762 DECL_TEMPLATE_RESULT (tmpl
) = decl
;
5763 TREE_TYPE (tmpl
) = TREE_TYPE (decl
);
5765 /* Push template declarations for global functions and types. Note
5766 that we do not try to push a global template friend declared in a
5767 template class; such a thing may well depend on the template
5768 parameters of the class. */
5769 if (new_template_p
&& !ctx
5770 && !(is_friend
&& template_class_depth (current_class_type
) > 0))
5772 tmpl
= pushdecl_namespace_level (tmpl
, is_friend
);
5773 if (tmpl
== error_mark_node
)
5774 return error_mark_node
;
5776 /* Hide template friend classes that haven't been declared yet. */
5777 if (is_friend
&& TREE_CODE (decl
) == TYPE_DECL
)
5779 DECL_ANTICIPATED (tmpl
) = 1;
5780 DECL_FRIEND_P (tmpl
) = 1;
5786 tree parms
= DECL_TEMPLATE_PARMS (tmpl
);
5788 DECL_PRIMARY_TEMPLATE (tmpl
) = tmpl
;
5790 /* Give template template parms a DECL_CONTEXT of the template
5791 for which they are a parameter. */
5792 parms
= INNERMOST_TEMPLATE_PARMS (parms
);
5793 for (int i
= TREE_VEC_LENGTH (parms
) - 1; i
>= 0; --i
)
5795 tree parm
= TREE_VALUE (TREE_VEC_ELT (parms
, i
));
5796 if (TREE_CODE (parm
) == TEMPLATE_DECL
)
5797 DECL_CONTEXT (parm
) = tmpl
;
5800 if (TREE_CODE (decl
) == TYPE_DECL
5801 && TYPE_DECL_ALIAS_P (decl
)
5802 && complex_alias_template_p (tmpl
))
5803 TEMPLATE_DECL_COMPLEX_ALIAS_P (tmpl
) = true;
5806 /* The DECL_TI_ARGS of DECL contains full set of arguments referring
5807 back to its most general template. If TMPL is a specialization,
5808 ARGS may only have the innermost set of arguments. Add the missing
5809 argument levels if necessary. */
5810 if (DECL_TEMPLATE_INFO (tmpl
))
5811 args
= add_outermost_template_args (DECL_TI_ARGS (tmpl
), args
);
5813 info
= build_template_info (tmpl
, args
);
5815 if (DECL_IMPLICIT_TYPEDEF_P (decl
))
5816 SET_TYPE_TEMPLATE_INFO (TREE_TYPE (tmpl
), info
);
5820 retrofit_lang_decl (decl
);
5821 if (DECL_LANG_SPECIFIC (decl
))
5822 DECL_TEMPLATE_INFO (decl
) = info
;
5825 if (flag_implicit_templates
5827 && TREE_PUBLIC (decl
)
5828 && VAR_OR_FUNCTION_DECL_P (decl
))
5829 /* Set DECL_COMDAT on template instantiations; if we force
5830 them to be emitted by explicit instantiation or -frepo,
5831 mark_needed will tell cgraph to do the right thing. */
5832 DECL_COMDAT (decl
) = true;
5834 return DECL_TEMPLATE_RESULT (tmpl
);
5838 push_template_decl (tree decl
)
5840 return push_template_decl_real (decl
, false);
5843 /* FN is an inheriting constructor that inherits from the constructor
5844 template INHERITED; turn FN into a constructor template with a matching
5848 add_inherited_template_parms (tree fn
, tree inherited
)
5851 = INNERMOST_TEMPLATE_PARMS (DECL_TEMPLATE_PARMS (inherited
));
5852 inner_parms
= copy_node (inner_parms
);
5854 = tree_cons (size_int (processing_template_decl
+ 1),
5855 inner_parms
, current_template_parms
);
5856 tree tmpl
= build_template_decl (fn
, parms
, /*member*/true);
5857 tree args
= template_parms_to_args (parms
);
5858 DECL_TEMPLATE_INFO (fn
) = build_template_info (tmpl
, args
);
5859 TREE_TYPE (tmpl
) = TREE_TYPE (fn
);
5860 DECL_TEMPLATE_RESULT (tmpl
) = fn
;
5861 DECL_ARTIFICIAL (tmpl
) = true;
5862 DECL_PRIMARY_TEMPLATE (tmpl
) = tmpl
;
5866 /* Called when a class template TYPE is redeclared with the indicated
5867 template PARMS, e.g.:
5869 template <class T> struct S;
5870 template <class T> struct S {}; */
5873 redeclare_class_template (tree type
, tree parms
, tree cons
)
5879 if (!TYPE_TEMPLATE_INFO (type
))
5881 error ("%qT is not a template type", type
);
5885 tmpl
= TYPE_TI_TEMPLATE (type
);
5886 if (!PRIMARY_TEMPLATE_P (tmpl
))
5887 /* The type is nested in some template class. Nothing to worry
5888 about here; there are no new template parameters for the nested
5894 error ("template specifiers not specified in declaration of %qD",
5899 parms
= INNERMOST_TEMPLATE_PARMS (parms
);
5900 tmpl_parms
= DECL_INNERMOST_TEMPLATE_PARMS (tmpl
);
5902 if (TREE_VEC_LENGTH (parms
) != TREE_VEC_LENGTH (tmpl_parms
))
5904 error_n (input_location
, TREE_VEC_LENGTH (parms
),
5905 "redeclared with %d template parameter",
5906 "redeclared with %d template parameters",
5907 TREE_VEC_LENGTH (parms
));
5908 inform_n (DECL_SOURCE_LOCATION (tmpl
), TREE_VEC_LENGTH (tmpl_parms
),
5909 "previous declaration %qD used %d template parameter",
5910 "previous declaration %qD used %d template parameters",
5911 tmpl
, TREE_VEC_LENGTH (tmpl_parms
));
5915 for (i
= 0; i
< TREE_VEC_LENGTH (tmpl_parms
); ++i
)
5922 if (TREE_VEC_ELT (tmpl_parms
, i
) == error_mark_node
5923 || TREE_VEC_ELT (parms
, i
) == error_mark_node
)
5926 tmpl_parm
= TREE_VALUE (TREE_VEC_ELT (tmpl_parms
, i
));
5927 if (error_operand_p (tmpl_parm
))
5930 parm
= TREE_VALUE (TREE_VEC_ELT (parms
, i
));
5931 tmpl_default
= TREE_PURPOSE (TREE_VEC_ELT (tmpl_parms
, i
));
5932 parm_default
= TREE_PURPOSE (TREE_VEC_ELT (parms
, i
));
5934 /* TMPL_PARM and PARM can be either TYPE_DECL, PARM_DECL, or
5936 if (TREE_CODE (tmpl_parm
) != TREE_CODE (parm
)
5937 || (TREE_CODE (tmpl_parm
) != TYPE_DECL
5938 && !same_type_p (TREE_TYPE (tmpl_parm
), TREE_TYPE (parm
)))
5939 || (TREE_CODE (tmpl_parm
) != PARM_DECL
5940 && (TEMPLATE_TYPE_PARAMETER_PACK (TREE_TYPE (tmpl_parm
))
5941 != TEMPLATE_TYPE_PARAMETER_PACK (TREE_TYPE (parm
))))
5942 || (TREE_CODE (tmpl_parm
) == PARM_DECL
5943 && (TEMPLATE_PARM_PARAMETER_PACK (DECL_INITIAL (tmpl_parm
))
5944 != TEMPLATE_PARM_PARAMETER_PACK (DECL_INITIAL (parm
)))))
5946 error ("template parameter %q+#D", tmpl_parm
);
5947 error ("redeclared here as %q#D", parm
);
5951 if (tmpl_default
!= NULL_TREE
&& parm_default
!= NULL_TREE
)
5953 /* We have in [temp.param]:
5955 A template-parameter may not be given default arguments
5956 by two different declarations in the same scope. */
5957 error_at (input_location
, "redefinition of default argument for %q#D", parm
);
5958 inform (DECL_SOURCE_LOCATION (tmpl_parm
),
5959 "original definition appeared here");
5963 if (parm_default
!= NULL_TREE
)
5964 /* Update the previous template parameters (which are the ones
5965 that will really count) with the new default value. */
5966 TREE_PURPOSE (TREE_VEC_ELT (tmpl_parms
, i
)) = parm_default
;
5967 else if (tmpl_default
!= NULL_TREE
)
5968 /* Update the new parameters, too; they'll be used as the
5969 parameters for any members. */
5970 TREE_PURPOSE (TREE_VEC_ELT (parms
, i
)) = tmpl_default
;
5972 /* Give each template template parm in this redeclaration a
5973 DECL_CONTEXT of the template for which they are a parameter. */
5974 if (TREE_CODE (parm
) == TEMPLATE_DECL
)
5976 gcc_assert (DECL_CONTEXT (parm
) == NULL_TREE
);
5977 DECL_CONTEXT (parm
) = tmpl
;
5980 if (TREE_CODE (parm
) == TYPE_DECL
)
5981 TEMPLATE_TYPE_PARM_FOR_CLASS (TREE_TYPE (parm
)) = true;
5984 // Cannot redeclare a class template with a different set of constraints.
5985 if (!equivalent_constraints (get_constraints (tmpl
), cons
))
5987 error_at (input_location
, "redeclaration %q#D with different "
5988 "constraints", tmpl
);
5989 inform (DECL_SOURCE_LOCATION (tmpl
),
5990 "original declaration appeared here");
5996 /* The actual substitution part of instantiate_non_dependent_expr_sfinae,
5997 to be used when the caller has already checked
5998 (processing_template_decl
5999 && !instantiation_dependent_expression_p (expr)
6000 && potential_constant_expression (expr))
6001 and cleared processing_template_decl. */
6004 instantiate_non_dependent_expr_internal (tree expr
, tsubst_flags_t complain
)
6006 return tsubst_copy_and_build (expr
,
6009 /*in_decl=*/NULL_TREE
,
6010 /*function_p=*/false,
6011 /*integral_constant_expression_p=*/true);
6014 /* Simplify EXPR if it is a non-dependent expression. Returns the
6015 (possibly simplified) expression. */
6018 instantiate_non_dependent_expr_sfinae (tree expr
, tsubst_flags_t complain
)
6020 if (expr
== NULL_TREE
)
6023 /* If we're in a template, but EXPR isn't value dependent, simplify
6024 it. We're supposed to treat:
6026 template <typename T> void f(T[1 + 1]);
6027 template <typename T> void f(T[2]);
6029 as two declarations of the same function, for example. */
6030 if (processing_template_decl
6031 && is_nondependent_constant_expression (expr
))
6033 processing_template_decl_sentinel s
;
6034 expr
= instantiate_non_dependent_expr_internal (expr
, complain
);
6040 instantiate_non_dependent_expr (tree expr
)
6042 return instantiate_non_dependent_expr_sfinae (expr
, tf_error
);
6045 /* Like instantiate_non_dependent_expr, but return NULL_TREE rather than
6046 an uninstantiated expression. */
6049 instantiate_non_dependent_or_null (tree expr
)
6051 if (expr
== NULL_TREE
)
6053 if (processing_template_decl
)
6055 if (!is_nondependent_constant_expression (expr
))
6059 processing_template_decl_sentinel s
;
6060 expr
= instantiate_non_dependent_expr_internal (expr
, tf_error
);
6066 /* True iff T is a specialization of a variable template. */
6069 variable_template_specialization_p (tree t
)
6071 if (!VAR_P (t
) || !DECL_LANG_SPECIFIC (t
) || !DECL_TEMPLATE_INFO (t
))
6073 tree tmpl
= DECL_TI_TEMPLATE (t
);
6074 return variable_template_p (tmpl
);
6077 /* Return TRUE iff T is a type alias, a TEMPLATE_DECL for an alias
6078 template declaration, or a TYPE_DECL for an alias declaration. */
6081 alias_type_or_template_p (tree t
)
6085 return ((TREE_CODE (t
) == TYPE_DECL
&& TYPE_DECL_ALIAS_P (t
))
6088 && TYPE_DECL_ALIAS_P (TYPE_NAME (t
)))
6089 || DECL_ALIAS_TEMPLATE_P (t
));
6092 /* Return TRUE iff T is a specialization of an alias template. */
6095 alias_template_specialization_p (const_tree t
)
6097 /* It's an alias template specialization if it's an alias and its
6098 TYPE_NAME is a specialization of a primary template. */
6099 if (TYPE_ALIAS_P (t
))
6100 if (tree tinfo
= TYPE_ALIAS_TEMPLATE_INFO (t
))
6101 return PRIMARY_TEMPLATE_P (TI_TEMPLATE (tinfo
));
6106 /* An alias template is complex from a SFINAE perspective if a template-id
6107 using that alias can be ill-formed when the expansion is not, as with
6108 the void_t template. We determine this by checking whether the
6109 expansion for the alias template uses all its template parameters. */
6111 struct uses_all_template_parms_data
6118 uses_all_template_parms_r (tree t
, void *data_
)
6120 struct uses_all_template_parms_data
&data
6121 = *(struct uses_all_template_parms_data
*)data_
;
6122 tree idx
= get_template_parm_index (t
);
6124 if (TEMPLATE_PARM_LEVEL (idx
) == data
.level
)
6125 data
.seen
[TEMPLATE_PARM_IDX (idx
)] = true;
6130 complex_alias_template_p (const_tree tmpl
)
6132 struct uses_all_template_parms_data data
;
6133 tree pat
= DECL_ORIGINAL_TYPE (DECL_TEMPLATE_RESULT (tmpl
));
6134 tree parms
= DECL_TEMPLATE_PARMS (tmpl
);
6135 data
.level
= TMPL_PARMS_DEPTH (parms
);
6136 int len
= TREE_VEC_LENGTH (INNERMOST_TEMPLATE_PARMS (parms
));
6137 data
.seen
= XALLOCAVEC (bool, len
);
6138 for (int i
= 0; i
< len
; ++i
)
6139 data
.seen
[i
] = false;
6141 for_each_template_parm (pat
, uses_all_template_parms_r
, &data
, NULL
, true);
6142 for (int i
= 0; i
< len
; ++i
)
6148 /* Return TRUE iff T is a specialization of a complex alias template with
6149 dependent template-arguments. */
6152 dependent_alias_template_spec_p (const_tree t
)
6154 if (!alias_template_specialization_p (t
))
6157 tree tinfo
= TYPE_ALIAS_TEMPLATE_INFO (t
);
6158 if (!TEMPLATE_DECL_COMPLEX_ALIAS_P (TI_TEMPLATE (tinfo
)))
6161 tree args
= INNERMOST_TEMPLATE_ARGS (TI_ARGS (tinfo
));
6162 if (!any_dependent_template_arguments_p (args
))
6168 /* Return the number of innermost template parameters in TMPL. */
6171 num_innermost_template_parms (tree tmpl
)
6173 tree parms
= INNERMOST_TEMPLATE_PARMS (DECL_TEMPLATE_PARMS (tmpl
));
6174 return TREE_VEC_LENGTH (parms
);
6177 /* Return either TMPL or another template that it is equivalent to under DR
6178 1286: An alias that just changes the name of a template is equivalent to
6179 the other template. */
6182 get_underlying_template (tree tmpl
)
6184 gcc_assert (TREE_CODE (tmpl
) == TEMPLATE_DECL
);
6185 while (DECL_ALIAS_TEMPLATE_P (tmpl
))
6187 /* Determine if the alias is equivalent to an underlying template. */
6188 tree orig_type
= DECL_ORIGINAL_TYPE (DECL_TEMPLATE_RESULT (tmpl
));
6189 tree tinfo
= TYPE_TEMPLATE_INFO_MAYBE_ALIAS (orig_type
);
6193 tree underlying
= TI_TEMPLATE (tinfo
);
6194 if (!PRIMARY_TEMPLATE_P (underlying
)
6195 || (num_innermost_template_parms (tmpl
)
6196 != num_innermost_template_parms (underlying
)))
6199 tree alias_args
= INNERMOST_TEMPLATE_ARGS
6200 (template_parms_to_args (DECL_TEMPLATE_PARMS (tmpl
)));
6201 if (!comp_template_args (TI_ARGS (tinfo
), alias_args
))
6204 /* Alias is equivalent. Strip it and repeat. */
6211 /* Subroutine of convert_nontype_argument. Converts EXPR to TYPE, which
6212 must be a reference-to-function or a pointer-to-function type, as specified
6213 in [temp.arg.nontype]: disambiguate EXPR if it is an overload set,
6214 and check that the resulting function has external linkage. */
6217 convert_nontype_argument_function (tree type
, tree expr
,
6218 tsubst_flags_t complain
)
6222 linkage_kind linkage
;
6224 fn
= instantiate_type (type
, fns
, tf_none
);
6225 if (fn
== error_mark_node
)
6226 return error_mark_node
;
6228 if (value_dependent_expression_p (fn
))
6231 fn_no_ptr
= strip_fnptr_conv (fn
);
6232 if (TREE_CODE (fn_no_ptr
) == ADDR_EXPR
)
6233 fn_no_ptr
= TREE_OPERAND (fn_no_ptr
, 0);
6234 if (BASELINK_P (fn_no_ptr
))
6235 fn_no_ptr
= BASELINK_FUNCTIONS (fn_no_ptr
);
6237 /* [temp.arg.nontype]/1
6239 A template-argument for a non-type, non-template template-parameter
6242 -- the address of an object or function with external [C++11: or
6243 internal] linkage. */
6245 if (TREE_CODE (fn_no_ptr
) != FUNCTION_DECL
)
6247 if (complain
& tf_error
)
6249 error ("%qE is not a valid template argument for type %qT",
6251 if (TYPE_PTR_P (type
))
6252 inform (input_location
, "it must be the address of a function "
6253 "with external linkage");
6255 inform (input_location
, "it must be the name of a function with "
6256 "external linkage");
6261 linkage
= decl_linkage (fn_no_ptr
);
6262 if (cxx_dialect
>= cxx11
? linkage
== lk_none
: linkage
!= lk_external
)
6264 if (complain
& tf_error
)
6266 if (cxx_dialect
>= cxx11
)
6267 error ("%qE is not a valid template argument for type %qT "
6268 "because %qD has no linkage",
6269 expr
, type
, fn_no_ptr
);
6271 error ("%qE is not a valid template argument for type %qT "
6272 "because %qD does not have external linkage",
6273 expr
, type
, fn_no_ptr
);
6279 if (TREE_CODE (type
) == REFERENCE_TYPE
)
6281 if (REFERENCE_REF_P (fn
))
6282 fn
= TREE_OPERAND (fn
, 0);
6284 fn
= build_address (fn
);
6286 if (!same_type_ignoring_top_level_qualifiers_p (type
, TREE_TYPE (fn
)))
6287 fn
= build_nop (type
, fn
);
6292 /* Subroutine of convert_nontype_argument.
6293 Check if EXPR of type TYPE is a valid pointer-to-member constant.
6294 Emit an error otherwise. */
6297 check_valid_ptrmem_cst_expr (tree type
, tree expr
,
6298 tsubst_flags_t complain
)
6300 location_t loc
= EXPR_LOC_OR_LOC (expr
, input_location
);
6301 tree orig_expr
= expr
;
6303 if (null_ptr_cst_p (expr
))
6305 if (TREE_CODE (expr
) == PTRMEM_CST
6306 && same_type_p (TYPE_PTRMEM_CLASS_TYPE (type
),
6307 PTRMEM_CST_CLASS (expr
)))
6309 if (cxx_dialect
>= cxx11
&& null_member_pointer_value_p (expr
))
6311 if (processing_template_decl
6312 && TREE_CODE (expr
) == ADDR_EXPR
6313 && TREE_CODE (TREE_OPERAND (expr
, 0)) == OFFSET_REF
)
6315 if (complain
& tf_error
)
6317 error_at (loc
, "%qE is not a valid template argument for type %qT",
6319 if (TREE_CODE (expr
) != PTRMEM_CST
)
6320 inform (loc
, "it must be a pointer-to-member of the form %<&X::Y%>");
6322 inform (loc
, "because it is a member of %qT", PTRMEM_CST_CLASS (expr
));
6327 /* Returns TRUE iff the address of OP is value-dependent.
6329 14.6.2.4 [temp.dep.temp]:
6330 A non-integral non-type template-argument is dependent if its type is
6331 dependent or it has either of the following forms
6334 and contains a nested-name-specifier which specifies a class-name that
6335 names a dependent type.
6337 We generalize this to just say that the address of a member of a
6338 dependent class is value-dependent; the above doesn't cover the
6339 address of a static data member named with an unqualified-id. */
6342 has_value_dependent_address (tree op
)
6344 /* We could use get_inner_reference here, but there's no need;
6345 this is only relevant for template non-type arguments, which
6346 can only be expressed as &id-expression. */
6349 tree ctx
= CP_DECL_CONTEXT (op
);
6350 if (TYPE_P (ctx
) && dependent_type_p (ctx
))
6357 /* The next set of functions are used for providing helpful explanatory
6358 diagnostics for failed overload resolution. Their messages should be
6359 indented by two spaces for consistency with the messages in
6363 unify_success (bool /*explain_p*/)
6368 /* Other failure functions should call this one, to provide a single function
6369 for setting a breakpoint on. */
6372 unify_invalid (bool /*explain_p*/)
6378 unify_parameter_deduction_failure (bool explain_p
, tree parm
)
6381 inform (input_location
,
6382 " couldn't deduce template parameter %qD", parm
);
6383 return unify_invalid (explain_p
);
6387 unify_cv_qual_mismatch (bool explain_p
, tree parm
, tree arg
)
6390 inform (input_location
,
6391 " types %qT and %qT have incompatible cv-qualifiers",
6393 return unify_invalid (explain_p
);
6397 unify_type_mismatch (bool explain_p
, tree parm
, tree arg
)
6400 inform (input_location
, " mismatched types %qT and %qT", parm
, arg
);
6401 return unify_invalid (explain_p
);
6405 unify_parameter_pack_mismatch (bool explain_p
, tree parm
, tree arg
)
6408 inform (input_location
,
6409 " template parameter %qD is not a parameter pack, but "
6412 return unify_invalid (explain_p
);
6416 unify_ptrmem_cst_mismatch (bool explain_p
, tree parm
, tree arg
)
6419 inform (input_location
,
6420 " template argument %qE does not match "
6421 "pointer-to-member constant %qE",
6423 return unify_invalid (explain_p
);
6427 unify_expression_unequal (bool explain_p
, tree parm
, tree arg
)
6430 inform (input_location
, " %qE is not equivalent to %qE", parm
, arg
);
6431 return unify_invalid (explain_p
);
6435 unify_parameter_pack_inconsistent (bool explain_p
, tree old_arg
, tree new_arg
)
6438 inform (input_location
,
6439 " inconsistent parameter pack deduction with %qT and %qT",
6441 return unify_invalid (explain_p
);
6445 unify_inconsistency (bool explain_p
, tree parm
, tree first
, tree second
)
6450 inform (input_location
,
6451 " deduced conflicting types for parameter %qT (%qT and %qT)",
6452 parm
, first
, second
);
6454 inform (input_location
,
6455 " deduced conflicting values for non-type parameter "
6456 "%qE (%qE and %qE)", parm
, first
, second
);
6458 return unify_invalid (explain_p
);
6462 unify_vla_arg (bool explain_p
, tree arg
)
6465 inform (input_location
,
6466 " variable-sized array type %qT is not "
6467 "a valid template argument",
6469 return unify_invalid (explain_p
);
6473 unify_method_type_error (bool explain_p
, tree arg
)
6476 inform (input_location
,
6477 " member function type %qT is not a valid template argument",
6479 return unify_invalid (explain_p
);
6483 unify_arity (bool explain_p
, int have
, int wanted
, bool least_p
= false)
6488 inform_n (input_location
, wanted
,
6489 " candidate expects at least %d argument, %d provided",
6490 " candidate expects at least %d arguments, %d provided",
6493 inform_n (input_location
, wanted
,
6494 " candidate expects %d argument, %d provided",
6495 " candidate expects %d arguments, %d provided",
6498 return unify_invalid (explain_p
);
6502 unify_too_many_arguments (bool explain_p
, int have
, int wanted
)
6504 return unify_arity (explain_p
, have
, wanted
);
6508 unify_too_few_arguments (bool explain_p
, int have
, int wanted
,
6509 bool least_p
= false)
6511 return unify_arity (explain_p
, have
, wanted
, least_p
);
6515 unify_arg_conversion (bool explain_p
, tree to_type
,
6516 tree from_type
, tree arg
)
6519 inform (EXPR_LOC_OR_LOC (arg
, input_location
),
6520 " cannot convert %qE (type %qT) to type %qT",
6521 arg
, from_type
, to_type
);
6522 return unify_invalid (explain_p
);
6526 unify_no_common_base (bool explain_p
, enum template_base_result r
,
6527 tree parm
, tree arg
)
6532 case tbr_ambiguous_baseclass
:
6533 inform (input_location
, " %qT is an ambiguous base class of %qT",
6537 inform (input_location
, " %qT is not derived from %qT", arg
, parm
);
6540 return unify_invalid (explain_p
);
6544 unify_inconsistent_template_template_parameters (bool explain_p
)
6547 inform (input_location
,
6548 " template parameters of a template template argument are "
6549 "inconsistent with other deduced template arguments");
6550 return unify_invalid (explain_p
);
6554 unify_template_deduction_failure (bool explain_p
, tree parm
, tree arg
)
6557 inform (input_location
,
6558 " can't deduce a template for %qT from non-template type %qT",
6560 return unify_invalid (explain_p
);
6564 unify_template_argument_mismatch (bool explain_p
, tree parm
, tree arg
)
6567 inform (input_location
,
6568 " template argument %qE does not match %qE", arg
, parm
);
6569 return unify_invalid (explain_p
);
6572 /* Attempt to convert the non-type template parameter EXPR to the
6573 indicated TYPE. If the conversion is successful, return the
6574 converted value. If the conversion is unsuccessful, return
6575 NULL_TREE if we issued an error message, or error_mark_node if we
6576 did not. We issue error messages for out-and-out bad template
6577 parameters, but not simply because the conversion failed, since we
6578 might be just trying to do argument deduction. Both TYPE and EXPR
6579 must be non-dependent.
6581 The conversion follows the special rules described in
6582 [temp.arg.nontype], and it is much more strict than an implicit
6585 This function is called twice for each template argument (see
6586 lookup_template_class for a more accurate description of this
6587 problem). This means that we need to handle expressions which
6588 are not valid in a C++ source, but can be created from the
6589 first call (for instance, casts to perform conversions). These
6590 hacks can go away after we fix the double coercion problem. */
6593 convert_nontype_argument (tree type
, tree expr
, tsubst_flags_t complain
)
6596 location_t loc
= EXPR_LOC_OR_LOC (expr
, input_location
);
6597 tree orig_expr
= expr
;
6599 /* Detect immediately string literals as invalid non-type argument.
6600 This special-case is not needed for correctness (we would easily
6601 catch this later), but only to provide better diagnostic for this
6602 common user mistake. As suggested by DR 100, we do not mention
6603 linkage issues in the diagnostic as this is not the point. */
6604 /* FIXME we're making this OK. */
6605 if (TREE_CODE (expr
) == STRING_CST
)
6607 if (complain
& tf_error
)
6608 error ("%qE is not a valid template argument for type %qT "
6609 "because string literals can never be used in this context",
6614 /* Add the ADDR_EXPR now for the benefit of
6615 value_dependent_expression_p. */
6616 if (TYPE_PTROBV_P (type
)
6617 && TREE_CODE (TREE_TYPE (expr
)) == ARRAY_TYPE
)
6619 expr
= decay_conversion (expr
, complain
);
6620 if (expr
== error_mark_node
)
6621 return error_mark_node
;
6624 /* If we are in a template, EXPR may be non-dependent, but still
6625 have a syntactic, rather than semantic, form. For example, EXPR
6626 might be a SCOPE_REF, rather than the VAR_DECL to which the
6627 SCOPE_REF refers. Preserving the qualifying scope is necessary
6628 so that access checking can be performed when the template is
6629 instantiated -- but here we need the resolved form so that we can
6630 convert the argument. */
6631 bool non_dep
= false;
6632 if (TYPE_REF_OBJ_P (type
)
6633 && has_value_dependent_address (expr
))
6634 /* If we want the address and it's value-dependent, don't fold. */;
6635 else if (processing_template_decl
6636 && is_nondependent_constant_expression (expr
))
6638 if (error_operand_p (expr
))
6639 return error_mark_node
;
6640 expr_type
= TREE_TYPE (expr
);
6642 /* If the argument is non-dependent, perform any conversions in
6643 non-dependent context as well. */
6644 processing_template_decl_sentinel
s (non_dep
);
6646 expr
= instantiate_non_dependent_expr_internal (expr
, complain
);
6648 if (value_dependent_expression_p (expr
))
6649 expr
= canonicalize_expr_argument (expr
, complain
);
6651 /* 14.3.2/5: The null pointer{,-to-member} conversion is applied
6652 to a non-type argument of "nullptr". */
6653 if (NULLPTR_TYPE_P (expr_type
) && TYPE_PTR_OR_PTRMEM_P (type
))
6654 expr
= fold_simple (convert (type
, expr
));
6656 /* In C++11, integral or enumeration non-type template arguments can be
6657 arbitrary constant expressions. Pointer and pointer to
6658 member arguments can be general constant expressions that evaluate
6659 to a null value, but otherwise still need to be of a specific form. */
6660 if (cxx_dialect
>= cxx11
)
6662 if (TREE_CODE (expr
) == PTRMEM_CST
)
6663 /* A PTRMEM_CST is already constant, and a valid template
6664 argument for a parameter of pointer to member type, we just want
6665 to leave it in that form rather than lower it to a
6667 else if (INTEGRAL_OR_ENUMERATION_TYPE_P (type
)
6668 || cxx_dialect
>= cxx17
)
6670 /* C++17: A template-argument for a non-type template-parameter shall
6671 be a converted constant expression (8.20) of the type of the
6672 template-parameter. */
6673 expr
= build_converted_constant_expr (type
, expr
, complain
);
6674 if (expr
== error_mark_node
)
6675 return error_mark_node
;
6676 expr
= maybe_constant_value (expr
);
6677 expr
= convert_from_reference (expr
);
6679 else if (TYPE_PTR_OR_PTRMEM_P (type
))
6681 tree folded
= maybe_constant_value (expr
);
6682 if (TYPE_PTR_P (type
) ? integer_zerop (folded
)
6683 : null_member_pointer_value_p (folded
))
6688 if (TREE_CODE (type
) == REFERENCE_TYPE
)
6689 expr
= mark_lvalue_use (expr
);
6691 expr
= mark_rvalue_use (expr
);
6693 /* HACK: Due to double coercion, we can get a
6694 NOP_EXPR<REFERENCE_TYPE>(ADDR_EXPR<POINTER_TYPE> (arg)) here,
6695 which is the tree that we built on the first call (see
6696 below when coercing to reference to object or to reference to
6697 function). We just strip everything and get to the arg.
6698 See g++.old-deja/g++.oliva/template4.C and g++.dg/template/nontype9.C
6700 if (TYPE_REF_OBJ_P (type
) || TYPE_REFFN_P (type
))
6702 tree probe_type
, probe
= expr
;
6703 if (REFERENCE_REF_P (probe
))
6704 probe
= TREE_OPERAND (probe
, 0);
6705 probe_type
= TREE_TYPE (probe
);
6706 if (TREE_CODE (probe
) == NOP_EXPR
)
6708 /* ??? Maybe we could use convert_from_reference here, but we
6709 would need to relax its constraints because the NOP_EXPR
6710 could actually change the type to something more cv-qualified,
6711 and this is not folded by convert_from_reference. */
6712 tree addr
= TREE_OPERAND (probe
, 0);
6713 if (TREE_CODE (probe_type
) == REFERENCE_TYPE
6714 && TREE_CODE (addr
) == ADDR_EXPR
6715 && TYPE_PTR_P (TREE_TYPE (addr
))
6716 && (same_type_ignoring_top_level_qualifiers_p
6717 (TREE_TYPE (probe_type
),
6718 TREE_TYPE (TREE_TYPE (addr
)))))
6720 expr
= TREE_OPERAND (addr
, 0);
6721 expr_type
= TREE_TYPE (probe_type
);
6726 /* [temp.arg.nontype]/5, bullet 1
6728 For a non-type template-parameter of integral or enumeration type,
6729 integral promotions (_conv.prom_) and integral conversions
6730 (_conv.integral_) are applied. */
6731 if (INTEGRAL_OR_ENUMERATION_TYPE_P (type
))
6733 if (cxx_dialect
< cxx11
)
6735 tree t
= build_converted_constant_expr (type
, expr
, complain
);
6736 t
= maybe_constant_value (t
);
6737 if (t
!= error_mark_node
)
6741 if (!same_type_ignoring_top_level_qualifiers_p (type
, TREE_TYPE (expr
)))
6742 return error_mark_node
;
6744 /* Notice that there are constant expressions like '4 % 0' which
6745 do not fold into integer constants. */
6746 if (TREE_CODE (expr
) != INTEGER_CST
6747 && !value_dependent_expression_p (expr
))
6749 if (complain
& tf_error
)
6751 int errs
= errorcount
, warns
= warningcount
+ werrorcount
;
6752 if (!require_potential_constant_expression (expr
))
6753 expr
= error_mark_node
;
6755 expr
= cxx_constant_value (expr
);
6756 if (errorcount
> errs
|| warningcount
+ werrorcount
> warns
)
6757 inform (loc
, "in template argument for type %qT", type
);
6758 if (expr
== error_mark_node
)
6760 /* else cxx_constant_value complained but gave us
6761 a real constant, so go ahead. */
6762 if (TREE_CODE (expr
) != INTEGER_CST
)
6764 /* Some assemble time constant expressions like
6765 (intptr_t)&&lab1 - (intptr_t)&&lab2 or
6766 4 + (intptr_t)&&var satisfy reduced_constant_expression_p
6767 as we can emit them into .rodata initializers of
6768 variables, yet they can't fold into an INTEGER_CST at
6769 compile time. Refuse them here. */
6770 gcc_checking_assert (reduced_constant_expression_p (expr
));
6771 error_at (loc
, "template argument %qE for type %qT not "
6772 "a constant integer", expr
, type
);
6780 /* Avoid typedef problems. */
6781 if (TREE_TYPE (expr
) != type
)
6782 expr
= fold_convert (type
, expr
);
6784 /* [temp.arg.nontype]/5, bullet 2
6786 For a non-type template-parameter of type pointer to object,
6787 qualification conversions (_conv.qual_) and the array-to-pointer
6788 conversion (_conv.array_) are applied. */
6789 else if (TYPE_PTROBV_P (type
))
6791 tree decayed
= expr
;
6793 /* Look through any NOP_EXPRs around an ADDR_EXPR, whether they come from
6794 decay_conversion or an explicit cast. If it's a problematic cast,
6795 we'll complain about it below. */
6796 if (TREE_CODE (expr
) == NOP_EXPR
)
6800 if (TREE_CODE (probe
) == ADDR_EXPR
6801 && TYPE_PTR_P (TREE_TYPE (probe
)))
6804 expr_type
= TREE_TYPE (expr
);
6808 /* [temp.arg.nontype]/1 (TC1 version, DR 49):
6810 A template-argument for a non-type, non-template template-parameter
6811 shall be one of: [...]
6813 -- the name of a non-type template-parameter;
6814 -- the address of an object or function with external linkage, [...]
6815 expressed as "& id-expression" where the & is optional if the name
6816 refers to a function or array, or if the corresponding
6817 template-parameter is a reference.
6819 Here, we do not care about functions, as they are invalid anyway
6820 for a parameter of type pointer-to-object. */
6822 if (value_dependent_expression_p (expr
))
6823 /* Non-type template parameters are OK. */
6825 else if (cxx_dialect
>= cxx11
&& integer_zerop (expr
))
6826 /* Null pointer values are OK in C++11. */;
6827 else if (TREE_CODE (expr
) != ADDR_EXPR
)
6831 if (complain
& tf_error
)
6832 error ("%qD is not a valid template argument "
6833 "because %qD is a variable, not the address of "
6834 "a variable", orig_expr
, expr
);
6837 if (POINTER_TYPE_P (expr_type
))
6839 if (complain
& tf_error
)
6840 error ("%qE is not a valid template argument for %qT "
6841 "because it is not the address of a variable",
6845 /* Other values, like integer constants, might be valid
6846 non-type arguments of some other type. */
6847 return error_mark_node
;
6851 tree decl
= TREE_OPERAND (expr
, 0);
6855 if (complain
& tf_error
)
6856 error ("%qE is not a valid template argument of type %qT "
6857 "because %qE is not a variable", orig_expr
, type
, decl
);
6860 else if (cxx_dialect
< cxx11
&& !DECL_EXTERNAL_LINKAGE_P (decl
))
6862 if (complain
& tf_error
)
6863 error ("%qE is not a valid template argument of type %qT "
6864 "because %qD does not have external linkage",
6865 orig_expr
, type
, decl
);
6868 else if ((cxx_dialect
>= cxx11
&& cxx_dialect
< cxx17
)
6869 && decl_linkage (decl
) == lk_none
)
6871 if (complain
& tf_error
)
6872 error ("%qE is not a valid template argument of type %qT "
6873 "because %qD has no linkage", orig_expr
, type
, decl
);
6876 /* C++17: For a non-type template-parameter of reference or pointer
6877 type, the value of the constant expression shall not refer to (or
6878 for a pointer type, shall not be the address of):
6879 * a subobject (4.5),
6880 * a temporary object (15.2),
6881 * a string literal (5.13.5),
6882 * the result of a typeid expression (8.2.8), or
6883 * a predefined __func__ variable (11.4.1). */
6884 else if (DECL_ARTIFICIAL (decl
))
6886 if (complain
& tf_error
)
6887 error ("the address of %qD is not a valid template argument",
6891 else if (!same_type_ignoring_top_level_qualifiers_p
6892 (strip_array_types (TREE_TYPE (type
)),
6893 strip_array_types (TREE_TYPE (decl
))))
6895 if (complain
& tf_error
)
6896 error ("the address of the %qT subobject of %qD is not a "
6897 "valid template argument", TREE_TYPE (type
), decl
);
6900 else if (!TREE_STATIC (decl
) && !DECL_EXTERNAL (decl
))
6902 if (complain
& tf_error
)
6903 error ("the address of %qD is not a valid template argument "
6904 "because it does not have static storage duration",
6912 expr
= perform_qualification_conversions (type
, expr
);
6913 if (expr
== error_mark_node
)
6914 return error_mark_node
;
6916 /* [temp.arg.nontype]/5, bullet 3
6918 For a non-type template-parameter of type reference to object, no
6919 conversions apply. The type referred to by the reference may be more
6920 cv-qualified than the (otherwise identical) type of the
6921 template-argument. The template-parameter is bound directly to the
6922 template-argument, which must be an lvalue. */
6923 else if (TYPE_REF_OBJ_P (type
))
6925 if (!same_type_ignoring_top_level_qualifiers_p (TREE_TYPE (type
),
6927 return error_mark_node
;
6929 if (!at_least_as_qualified_p (TREE_TYPE (type
), expr_type
))
6931 if (complain
& tf_error
)
6932 error ("%qE is not a valid template argument for type %qT "
6933 "because of conflicts in cv-qualification", expr
, type
);
6937 if (!lvalue_p (expr
))
6939 if (complain
& tf_error
)
6940 error ("%qE is not a valid template argument for type %qT "
6941 "because it is not an lvalue", expr
, type
);
6945 /* [temp.arg.nontype]/1
6947 A template-argument for a non-type, non-template template-parameter
6948 shall be one of: [...]
6950 -- the address of an object or function with external linkage. */
6951 if (INDIRECT_REF_P (expr
)
6952 && TYPE_REF_OBJ_P (TREE_TYPE (TREE_OPERAND (expr
, 0))))
6954 expr
= TREE_OPERAND (expr
, 0);
6957 if (complain
& tf_error
)
6958 error ("%q#D is not a valid template argument for type %qT "
6959 "because a reference variable does not have a constant "
6960 "address", expr
, type
);
6965 if (TYPE_REF_OBJ_P (TREE_TYPE (expr
))
6966 && value_dependent_expression_p (expr
))
6967 /* OK, dependent reference. We don't want to ask whether a DECL is
6968 itself value-dependent, since what we want here is its address. */;
6973 if (complain
& tf_error
)
6974 error ("%qE is not a valid template argument for type %qT "
6975 "because it is not an object with linkage",
6980 /* DR 1155 allows internal linkage in C++11 and up. */
6981 linkage_kind linkage
= decl_linkage (expr
);
6982 if (linkage
< (cxx_dialect
>= cxx11
? lk_internal
: lk_external
))
6984 if (complain
& tf_error
)
6985 error ("%qE is not a valid template argument for type %qT "
6986 "because object %qD does not have linkage",
6991 expr
= build_address (expr
);
6994 if (!same_type_p (type
, TREE_TYPE (expr
)))
6995 expr
= build_nop (type
, expr
);
6997 /* [temp.arg.nontype]/5, bullet 4
6999 For a non-type template-parameter of type pointer to function, only
7000 the function-to-pointer conversion (_conv.func_) is applied. If the
7001 template-argument represents a set of overloaded functions (or a
7002 pointer to such), the matching function is selected from the set
7004 else if (TYPE_PTRFN_P (type
))
7006 /* If the argument is a template-id, we might not have enough
7007 context information to decay the pointer. */
7008 if (!type_unknown_p (expr_type
))
7010 expr
= decay_conversion (expr
, complain
);
7011 if (expr
== error_mark_node
)
7012 return error_mark_node
;
7015 if (cxx_dialect
>= cxx11
&& integer_zerop (expr
))
7016 /* Null pointer values are OK in C++11. */
7017 return perform_qualification_conversions (type
, expr
);
7019 expr
= convert_nontype_argument_function (type
, expr
, complain
);
7020 if (!expr
|| expr
== error_mark_node
)
7023 /* [temp.arg.nontype]/5, bullet 5
7025 For a non-type template-parameter of type reference to function, no
7026 conversions apply. If the template-argument represents a set of
7027 overloaded functions, the matching function is selected from the set
7029 else if (TYPE_REFFN_P (type
))
7031 if (TREE_CODE (expr
) == ADDR_EXPR
)
7033 if (complain
& tf_error
)
7035 error ("%qE is not a valid template argument for type %qT "
7036 "because it is a pointer", expr
, type
);
7037 inform (input_location
, "try using %qE instead",
7038 TREE_OPERAND (expr
, 0));
7043 expr
= convert_nontype_argument_function (type
, expr
, complain
);
7044 if (!expr
|| expr
== error_mark_node
)
7047 /* [temp.arg.nontype]/5, bullet 6
7049 For a non-type template-parameter of type pointer to member function,
7050 no conversions apply. If the template-argument represents a set of
7051 overloaded member functions, the matching member function is selected
7052 from the set (_over.over_). */
7053 else if (TYPE_PTRMEMFUNC_P (type
))
7055 expr
= instantiate_type (type
, expr
, tf_none
);
7056 if (expr
== error_mark_node
)
7057 return error_mark_node
;
7059 /* [temp.arg.nontype] bullet 1 says the pointer to member
7060 expression must be a pointer-to-member constant. */
7061 if (!value_dependent_expression_p (expr
)
7062 && !check_valid_ptrmem_cst_expr (type
, expr
, complain
))
7065 /* Repeated conversion can't deal with a conversion that turns PTRMEM_CST
7066 into a CONSTRUCTOR, so build up a new PTRMEM_CST instead. */
7067 if (fnptr_conv_p (type
, TREE_TYPE (expr
)))
7068 expr
= make_ptrmem_cst (type
, PTRMEM_CST_MEMBER (expr
));
7070 /* [temp.arg.nontype]/5, bullet 7
7072 For a non-type template-parameter of type pointer to data member,
7073 qualification conversions (_conv.qual_) are applied. */
7074 else if (TYPE_PTRDATAMEM_P (type
))
7076 /* [temp.arg.nontype] bullet 1 says the pointer to member
7077 expression must be a pointer-to-member constant. */
7078 if (!value_dependent_expression_p (expr
)
7079 && !check_valid_ptrmem_cst_expr (type
, expr
, complain
))
7082 expr
= perform_qualification_conversions (type
, expr
);
7083 if (expr
== error_mark_node
)
7086 else if (NULLPTR_TYPE_P (type
))
7088 if (!NULLPTR_TYPE_P (TREE_TYPE (expr
)))
7090 if (complain
& tf_error
)
7091 error ("%qE is not a valid template argument for type %qT "
7092 "because it is of type %qT", expr
, type
, TREE_TYPE (expr
));
7097 /* A template non-type parameter must be one of the above. */
7101 /* Sanity check: did we actually convert the argument to the
7103 gcc_assert (same_type_ignoring_top_level_qualifiers_p
7104 (type
, TREE_TYPE (expr
)));
7105 return convert_from_reference (expr
);
7108 /* Subroutine of coerce_template_template_parms, which returns 1 if
7109 PARM_PARM and ARG_PARM match using the rule for the template
7110 parameters of template template parameters. Both PARM and ARG are
7111 template parameters; the rest of the arguments are the same as for
7112 coerce_template_template_parms.
7115 coerce_template_template_parm (tree parm
,
7117 tsubst_flags_t complain
,
7121 if (arg
== NULL_TREE
|| error_operand_p (arg
)
7122 || parm
== NULL_TREE
|| error_operand_p (parm
))
7125 if (TREE_CODE (arg
) != TREE_CODE (parm
))
7128 switch (TREE_CODE (parm
))
7131 /* We encounter instantiations of templates like
7132 template <template <template <class> class> class TT>
7135 tree parmparm
= DECL_INNERMOST_TEMPLATE_PARMS (parm
);
7136 tree argparm
= DECL_INNERMOST_TEMPLATE_PARMS (arg
);
7138 if (!coerce_template_template_parms
7139 (parmparm
, argparm
, complain
, in_decl
, outer_args
))
7145 if (TEMPLATE_TYPE_PARAMETER_PACK (TREE_TYPE (arg
))
7146 && !TEMPLATE_TYPE_PARAMETER_PACK (TREE_TYPE (parm
)))
7147 /* Argument is a parameter pack but parameter is not. */
7152 /* The tsubst call is used to handle cases such as
7154 template <int> class C {};
7155 template <class T, template <T> class TT> class D {};
7158 i.e. the parameter list of TT depends on earlier parameters. */
7159 if (!uses_template_parms (TREE_TYPE (arg
)))
7161 tree t
= tsubst (TREE_TYPE (parm
), outer_args
, complain
, in_decl
);
7162 if (!uses_template_parms (t
)
7163 && !same_type_p (t
, TREE_TYPE (arg
)))
7167 if (TEMPLATE_PARM_PARAMETER_PACK (DECL_INITIAL (arg
))
7168 && !TEMPLATE_PARM_PARAMETER_PACK (DECL_INITIAL (parm
)))
7169 /* Argument is a parameter pack but parameter is not. */
7181 /* Coerce template argument list ARGLIST for use with template
7182 template-parameter TEMPL. */
7185 coerce_template_args_for_ttp (tree templ
, tree arglist
,
7186 tsubst_flags_t complain
)
7188 /* Consider an example where a template template parameter declared as
7190 template <class T, class U = std::allocator<T> > class TT
7192 The template parameter level of T and U are one level larger than
7193 of TT. To proper process the default argument of U, say when an
7194 instantiation `TT<int>' is seen, we need to build the full
7195 arguments containing {int} as the innermost level. Outer levels,
7196 available when not appearing as default template argument, can be
7197 obtained from the arguments of the enclosing template.
7199 Suppose that TT is later substituted with std::vector. The above
7200 instantiation is `TT<int, std::allocator<T> >' with TT at
7201 level 1, and T at level 2, while the template arguments at level 1
7202 becomes {std::vector} and the inner level 2 is {int}. */
7204 tree outer
= DECL_CONTEXT (templ
);
7207 if (DECL_TEMPLATE_SPECIALIZATION (outer
))
7208 /* We want arguments for the partial specialization, not arguments for
7209 the primary template. */
7210 outer
= template_parms_to_args (DECL_TEMPLATE_PARMS (outer
));
7212 outer
= TI_ARGS (get_template_info (DECL_TEMPLATE_RESULT (outer
)));
7214 else if (current_template_parms
)
7216 /* This is an argument of the current template, so we haven't set
7217 DECL_CONTEXT yet. */
7218 tree relevant_template_parms
;
7220 /* Parameter levels that are greater than the level of the given
7221 template template parm are irrelevant. */
7222 relevant_template_parms
= current_template_parms
;
7223 while (TMPL_PARMS_DEPTH (relevant_template_parms
)
7224 != TEMPLATE_TYPE_LEVEL (TREE_TYPE (templ
)))
7225 relevant_template_parms
= TREE_CHAIN (relevant_template_parms
);
7227 outer
= template_parms_to_args (relevant_template_parms
);
7231 arglist
= add_to_template_args (outer
, arglist
);
7233 tree parmlist
= DECL_INNERMOST_TEMPLATE_PARMS (templ
);
7234 return coerce_template_parms (parmlist
, arglist
, templ
,
7236 /*require_all_args=*/true,
7237 /*use_default_args=*/true);
7240 /* A cache of template template parameters with match-all default
7242 static GTY((deletable
)) hash_map
<tree
,tree
> *defaulted_ttp_cache
;
7244 store_defaulted_ttp (tree v
, tree t
)
7246 if (!defaulted_ttp_cache
)
7247 defaulted_ttp_cache
= hash_map
<tree
,tree
>::create_ggc (13);
7248 defaulted_ttp_cache
->put (v
, t
);
7251 lookup_defaulted_ttp (tree v
)
7253 if (defaulted_ttp_cache
)
7254 if (tree
*p
= defaulted_ttp_cache
->get (v
))
7259 /* T is a bound template template-parameter. Copy its arguments into default
7260 arguments of the template template-parameter's template parameters. */
7263 add_defaults_to_ttp (tree otmpl
)
7265 if (tree c
= lookup_defaulted_ttp (otmpl
))
7268 tree ntmpl
= copy_node (otmpl
);
7270 tree ntype
= copy_node (TREE_TYPE (otmpl
));
7271 TYPE_STUB_DECL (ntype
) = TYPE_NAME (ntype
) = ntmpl
;
7272 TYPE_MAIN_VARIANT (ntype
) = ntype
;
7273 TYPE_POINTER_TO (ntype
) = TYPE_REFERENCE_TO (ntype
) = NULL_TREE
;
7274 TYPE_NAME (ntype
) = ntmpl
;
7275 SET_TYPE_STRUCTURAL_EQUALITY (ntype
);
7277 tree idx
= TEMPLATE_TYPE_PARM_INDEX (ntype
)
7278 = copy_node (TEMPLATE_TYPE_PARM_INDEX (ntype
));
7279 TEMPLATE_PARM_DECL (idx
) = ntmpl
;
7280 TREE_TYPE (ntmpl
) = TREE_TYPE (idx
) = ntype
;
7282 tree oparms
= DECL_TEMPLATE_PARMS (otmpl
);
7283 tree parms
= DECL_TEMPLATE_PARMS (ntmpl
) = copy_node (oparms
);
7284 TREE_CHAIN (parms
) = TREE_CHAIN (oparms
);
7285 tree vec
= TREE_VALUE (parms
) = copy_node (TREE_VALUE (parms
));
7286 for (int i
= 0; i
< TREE_VEC_LENGTH (vec
); ++i
)
7288 tree o
= TREE_VEC_ELT (vec
, i
);
7289 if (!template_parameter_pack_p (TREE_VALUE (o
)))
7291 tree n
= TREE_VEC_ELT (vec
, i
) = copy_node (o
);
7292 TREE_PURPOSE (n
) = any_targ_node
;
7296 store_defaulted_ttp (otmpl
, ntmpl
);
7300 /* ARG is a bound potential template template-argument, and PARGS is a list
7301 of arguments for the corresponding template template-parameter. Adjust
7302 PARGS as appropriate for application to ARG's template, and if ARG is a
7303 BOUND_TEMPLATE_TEMPLATE_PARM, possibly adjust it to add default template
7304 arguments to the template template parameter. */
7307 coerce_ttp_args_for_tta (tree
& arg
, tree pargs
, tsubst_flags_t complain
)
7309 ++processing_template_decl
;
7310 tree arg_tmpl
= TYPE_TI_TEMPLATE (arg
);
7311 if (DECL_TEMPLATE_TEMPLATE_PARM_P (arg_tmpl
))
7313 /* When comparing two template template-parameters in partial ordering,
7314 rewrite the one currently being used as an argument to have default
7315 arguments for all parameters. */
7316 arg_tmpl
= add_defaults_to_ttp (arg_tmpl
);
7317 pargs
= coerce_template_args_for_ttp (arg_tmpl
, pargs
, complain
);
7318 if (pargs
!= error_mark_node
)
7319 arg
= bind_template_template_parm (TREE_TYPE (arg_tmpl
),
7320 TYPE_TI_ARGS (arg
));
7325 = INNERMOST_TEMPLATE_PARMS (DECL_TEMPLATE_PARMS (arg_tmpl
));
7326 pargs
= coerce_template_parms (aparms
, pargs
, arg_tmpl
, complain
,
7327 /*require_all*/true,
7328 /*use_default*/true);
7330 --processing_template_decl
;
7334 /* Subroutine of unify for the case when PARM is a
7335 BOUND_TEMPLATE_TEMPLATE_PARM. */
7338 unify_bound_ttp_args (tree tparms
, tree targs
, tree parm
, tree
& arg
,
7341 tree parmvec
= TYPE_TI_ARGS (parm
);
7342 tree argvec
= INNERMOST_TEMPLATE_ARGS (TYPE_TI_ARGS (arg
));
7344 /* The template template parm might be variadic and the argument
7345 not, so flatten both argument lists. */
7346 parmvec
= expand_template_argument_pack (parmvec
);
7347 argvec
= expand_template_argument_pack (argvec
);
7351 /* In keeping with P0522R0, adjust P's template arguments
7352 to apply to A's template; then flatten it again. */
7353 tree nparmvec
= parmvec
;
7354 nparmvec
= coerce_ttp_args_for_tta (arg
, parmvec
, tf_none
);
7355 nparmvec
= expand_template_argument_pack (nparmvec
);
7357 if (unify (tparms
, targs
, nparmvec
, argvec
,
7358 UNIFY_ALLOW_NONE
, explain_p
))
7361 /* If the P0522 adjustment eliminated a pack expansion, deduce
7364 && TREE_VEC_LENGTH (nparmvec
) < TREE_VEC_LENGTH (parmvec
)
7365 && unify_pack_expansion (tparms
, targs
, parmvec
, argvec
,
7366 DEDUCE_EXACT
, /*sub*/true, explain_p
))
7371 /* Deduce arguments T, i from TT<T> or TT<i>.
7372 We check each element of PARMVEC and ARGVEC individually
7373 rather than the whole TREE_VEC since they can have
7374 different number of elements, which is allowed under N2555. */
7376 int len
= TREE_VEC_LENGTH (parmvec
);
7378 /* Check if the parameters end in a pack, making them
7380 int parm_variadic_p
= 0;
7382 && PACK_EXPANSION_P (TREE_VEC_ELT (parmvec
, len
- 1)))
7383 parm_variadic_p
= 1;
7385 for (int i
= 0; i
< len
- parm_variadic_p
; ++i
)
7386 /* If the template argument list of P contains a pack
7387 expansion that is not the last template argument, the
7388 entire template argument list is a non-deduced
7390 if (PACK_EXPANSION_P (TREE_VEC_ELT (parmvec
, i
)))
7391 return unify_success (explain_p
);
7393 if (TREE_VEC_LENGTH (argvec
) < len
- parm_variadic_p
)
7394 return unify_too_few_arguments (explain_p
,
7395 TREE_VEC_LENGTH (argvec
), len
);
7397 for (int i
= 0; i
< len
- parm_variadic_p
; ++i
)
7398 if (unify (tparms
, targs
,
7399 TREE_VEC_ELT (parmvec
, i
),
7400 TREE_VEC_ELT (argvec
, i
),
7401 UNIFY_ALLOW_NONE
, explain_p
))
7405 && unify_pack_expansion (tparms
, targs
,
7408 /*subr=*/true, explain_p
))
7415 /* Return 1 if PARM_PARMS and ARG_PARMS matches using rule for
7416 template template parameters. Both PARM_PARMS and ARG_PARMS are
7417 vectors of TREE_LIST nodes containing TYPE_DECL, TEMPLATE_DECL
7420 Consider the example:
7421 template <class T> class A;
7422 template<template <class U> class TT> class B;
7424 For B<A>, PARM_PARMS are the parameters to TT, while ARG_PARMS are
7425 the parameters to A, and OUTER_ARGS contains A. */
7428 coerce_template_template_parms (tree parm_parms
,
7430 tsubst_flags_t complain
,
7434 int nparms
, nargs
, i
;
7438 gcc_assert (TREE_CODE (parm_parms
) == TREE_VEC
);
7439 gcc_assert (TREE_CODE (arg_parms
) == TREE_VEC
);
7441 nparms
= TREE_VEC_LENGTH (parm_parms
);
7442 nargs
= TREE_VEC_LENGTH (arg_parms
);
7446 /* P0522R0: A template template-parameter P is at least as specialized as
7447 a template template-argument A if, given the following rewrite to two
7448 function templates, the function template corresponding to P is at
7449 least as specialized as the function template corresponding to A
7450 according to the partial ordering rules for function templates
7451 ([temp.func.order]). Given an invented class template X with the
7452 template parameter list of A (including default arguments):
7454 * Each of the two function templates has the same template parameters,
7455 respectively, as P or A.
7457 * Each function template has a single function parameter whose type is
7458 a specialization of X with template arguments corresponding to the
7459 template parameters from the respective function template where, for
7460 each template parameter PP in the template parameter list of the
7461 function template, a corresponding template argument AA is formed. If
7462 PP declares a parameter pack, then AA is the pack expansion
7463 PP... ([temp.variadic]); otherwise, AA is the id-expression PP.
7465 If the rewrite produces an invalid type, then P is not at least as
7466 specialized as A. */
7468 /* So coerce P's args to apply to A's parms, and then deduce between A's
7469 args and the converted args. If that succeeds, A is at least as
7470 specialized as P, so they match.*/
7471 tree pargs
= template_parms_level_to_args (parm_parms
);
7472 ++processing_template_decl
;
7473 pargs
= coerce_template_parms (arg_parms
, pargs
, NULL_TREE
, tf_none
,
7474 /*require_all*/true, /*use_default*/true);
7475 --processing_template_decl
;
7476 if (pargs
!= error_mark_node
)
7478 tree targs
= make_tree_vec (nargs
);
7479 tree aargs
= template_parms_level_to_args (arg_parms
);
7480 if (!unify (arg_parms
, targs
, aargs
, pargs
, UNIFY_ALLOW_NONE
,
7486 /* Determine whether we have a parameter pack at the end of the
7487 template template parameter's template parameter list. */
7488 if (TREE_VEC_ELT (parm_parms
, nparms
- 1) != error_mark_node
)
7490 parm
= TREE_VALUE (TREE_VEC_ELT (parm_parms
, nparms
- 1));
7492 if (error_operand_p (parm
))
7495 switch (TREE_CODE (parm
))
7499 if (TEMPLATE_TYPE_PARAMETER_PACK (TREE_TYPE (parm
)))
7504 if (TEMPLATE_PARM_PARAMETER_PACK (DECL_INITIAL (parm
)))
7514 && !(variadic_p
&& nargs
>= nparms
- 1))
7517 /* Check all of the template parameters except the parameter pack at
7518 the end (if any). */
7519 for (i
= 0; i
< nparms
- variadic_p
; ++i
)
7521 if (TREE_VEC_ELT (parm_parms
, i
) == error_mark_node
7522 || TREE_VEC_ELT (arg_parms
, i
) == error_mark_node
)
7525 parm
= TREE_VALUE (TREE_VEC_ELT (parm_parms
, i
));
7526 arg
= TREE_VALUE (TREE_VEC_ELT (arg_parms
, i
));
7528 if (!coerce_template_template_parm (parm
, arg
, complain
, in_decl
,
7536 /* Check each of the template parameters in the template
7537 argument against the template parameter pack at the end of
7538 the template template parameter. */
7539 if (TREE_VEC_ELT (parm_parms
, i
) == error_mark_node
)
7542 parm
= TREE_VALUE (TREE_VEC_ELT (parm_parms
, i
));
7544 for (; i
< nargs
; ++i
)
7546 if (TREE_VEC_ELT (arg_parms
, i
) == error_mark_node
)
7549 arg
= TREE_VALUE (TREE_VEC_ELT (arg_parms
, i
));
7551 if (!coerce_template_template_parm (parm
, arg
, complain
, in_decl
,
7560 /* Verifies that the deduced template arguments (in TARGS) for the
7561 template template parameters (in TPARMS) represent valid bindings,
7562 by comparing the template parameter list of each template argument
7563 to the template parameter list of its corresponding template
7564 template parameter, in accordance with DR150. This
7565 routine can only be called after all template arguments have been
7566 deduced. It will return TRUE if all of the template template
7567 parameter bindings are okay, FALSE otherwise. */
7569 template_template_parm_bindings_ok_p (tree tparms
, tree targs
)
7571 int i
, ntparms
= TREE_VEC_LENGTH (tparms
);
7574 /* We're dealing with template parms in this process. */
7575 ++processing_template_decl
;
7577 targs
= INNERMOST_TEMPLATE_ARGS (targs
);
7579 for (i
= 0; i
< ntparms
; ++i
)
7581 tree tparm
= TREE_VALUE (TREE_VEC_ELT (tparms
, i
));
7582 tree targ
= TREE_VEC_ELT (targs
, i
);
7584 if (TREE_CODE (tparm
) == TEMPLATE_DECL
&& targ
)
7586 tree packed_args
= NULL_TREE
;
7589 if (ARGUMENT_PACK_P (targ
))
7591 /* Look inside the argument pack. */
7592 packed_args
= ARGUMENT_PACK_ARGS (targ
);
7593 len
= TREE_VEC_LENGTH (packed_args
);
7596 for (idx
= 0; idx
< len
; ++idx
)
7598 tree targ_parms
= NULL_TREE
;
7601 /* Extract the next argument from the argument
7603 targ
= TREE_VEC_ELT (packed_args
, idx
);
7605 if (PACK_EXPANSION_P (targ
))
7606 /* Look at the pattern of the pack expansion. */
7607 targ
= PACK_EXPANSION_PATTERN (targ
);
7609 /* Extract the template parameters from the template
7611 if (TREE_CODE (targ
) == TEMPLATE_DECL
)
7612 targ_parms
= DECL_INNERMOST_TEMPLATE_PARMS (targ
);
7613 else if (TREE_CODE (targ
) == TEMPLATE_TEMPLATE_PARM
)
7614 targ_parms
= DECL_INNERMOST_TEMPLATE_PARMS (TYPE_NAME (targ
));
7616 /* Verify that we can coerce the template template
7617 parameters from the template argument to the template
7618 parameter. This requires an exact match. */
7620 && !coerce_template_template_parms
7621 (DECL_INNERMOST_TEMPLATE_PARMS (tparm
),
7636 --processing_template_decl
;
7640 /* Since type attributes aren't mangled, we need to strip them from
7641 template type arguments. */
7644 canonicalize_type_argument (tree arg
, tsubst_flags_t complain
)
7646 if (!arg
|| arg
== error_mark_node
|| arg
== TYPE_CANONICAL (arg
))
7648 bool removed_attributes
= false;
7649 tree canon
= strip_typedefs (arg
, &removed_attributes
);
7650 if (removed_attributes
7651 && (complain
& tf_warning
))
7652 warning (OPT_Wignored_attributes
,
7653 "ignoring attributes on template argument %qT", arg
);
7657 /* And from inside dependent non-type arguments like sizeof(Type). */
7660 canonicalize_expr_argument (tree arg
, tsubst_flags_t complain
)
7662 if (!arg
|| arg
== error_mark_node
)
7664 bool removed_attributes
= false;
7665 tree canon
= strip_typedefs_expr (arg
, &removed_attributes
);
7666 if (removed_attributes
7667 && (complain
& tf_warning
))
7668 warning (OPT_Wignored_attributes
,
7669 "ignoring attributes in template argument %qE", arg
);
7673 // A template declaration can be substituted for a constrained
7674 // template template parameter only when the argument is more
7675 // constrained than the parameter.
7677 is_compatible_template_arg (tree parm
, tree arg
)
7679 tree parm_cons
= get_constraints (parm
);
7681 /* For now, allow constrained template template arguments
7682 and unconstrained template template parameters. */
7683 if (parm_cons
== NULL_TREE
)
7686 tree arg_cons
= get_constraints (arg
);
7688 // If the template parameter is constrained, we need to rewrite its
7689 // constraints in terms of the ARG's template parameters. This ensures
7690 // that all of the template parameter types will have the same depth.
7692 // Note that this is only valid when coerce_template_template_parm is
7693 // true for the innermost template parameters of PARM and ARG. In other
7694 // words, because coercion is successful, this conversion will be valid.
7697 tree args
= template_parms_to_args (DECL_TEMPLATE_PARMS (arg
));
7698 parm_cons
= tsubst_constraint_info (parm_cons
,
7699 INNERMOST_TEMPLATE_ARGS (args
),
7700 tf_none
, NULL_TREE
);
7701 if (parm_cons
== error_mark_node
)
7705 return subsumes (parm_cons
, arg_cons
);
7708 // Convert a placeholder argument into a binding to the original
7709 // parameter. The original parameter is saved as the TREE_TYPE of
7712 convert_wildcard_argument (tree parm
, tree arg
)
7714 TREE_TYPE (arg
) = parm
;
7718 /* We can't fully resolve ARG given as a non-type template argument to TYPE,
7719 because one of them is dependent. But we need to represent the
7720 conversion for the benefit of cp_tree_equal. */
7723 maybe_convert_nontype_argument (tree type
, tree arg
)
7725 /* Auto parms get no conversion. */
7726 if (type_uses_auto (type
))
7728 /* We don't need or want to add this conversion now if we're going to use the
7729 argument for deduction. */
7730 if (value_dependent_expression_p (arg
))
7733 type
= cv_unqualified (type
);
7734 tree argtype
= TREE_TYPE (arg
);
7735 if (same_type_p (type
, argtype
))
7738 arg
= build1 (IMPLICIT_CONV_EXPR
, type
, arg
);
7739 IMPLICIT_CONV_EXPR_NONTYPE_ARG (arg
) = true;
7743 /* Convert the indicated template ARG as necessary to match the
7744 indicated template PARM. Returns the converted ARG, or
7745 error_mark_node if the conversion was unsuccessful. Error and
7746 warning messages are issued under control of COMPLAIN. This
7747 conversion is for the Ith parameter in the parameter list. ARGS is
7748 the full set of template arguments deduced so far. */
7751 convert_template_argument (tree parm
,
7754 tsubst_flags_t complain
,
7760 int is_type
, requires_type
, is_tmpl_type
, requires_tmpl_type
;
7762 if (parm
== error_mark_node
)
7763 return error_mark_node
;
7765 /* Trivially convert placeholders. */
7766 if (TREE_CODE (arg
) == WILDCARD_DECL
)
7767 return convert_wildcard_argument (parm
, arg
);
7769 if (arg
== any_targ_node
)
7772 if (TREE_CODE (arg
) == TREE_LIST
7773 && TREE_CODE (TREE_VALUE (arg
)) == OFFSET_REF
)
7775 /* The template argument was the name of some
7776 member function. That's usually
7777 invalid, but static members are OK. In any
7778 case, grab the underlying fields/functions
7779 and issue an error later if required. */
7780 orig_arg
= TREE_VALUE (arg
);
7781 TREE_TYPE (arg
) = unknown_type_node
;
7786 requires_tmpl_type
= TREE_CODE (parm
) == TEMPLATE_DECL
;
7787 requires_type
= (TREE_CODE (parm
) == TYPE_DECL
7788 || requires_tmpl_type
);
7790 /* When determining whether an argument pack expansion is a template,
7791 look at the pattern. */
7792 if (TREE_CODE (arg
) == TYPE_PACK_EXPANSION
)
7793 arg
= PACK_EXPANSION_PATTERN (arg
);
7795 /* Deal with an injected-class-name used as a template template arg. */
7796 if (requires_tmpl_type
&& CLASS_TYPE_P (arg
))
7798 tree t
= maybe_get_template_decl_from_type_decl (TYPE_NAME (arg
));
7799 if (TREE_CODE (t
) == TEMPLATE_DECL
)
7801 if (cxx_dialect
>= cxx11
)
7802 /* OK under DR 1004. */;
7803 else if (complain
& tf_warning_or_error
)
7804 pedwarn (input_location
, OPT_Wpedantic
, "injected-class-name %qD"
7805 " used as template template argument", TYPE_NAME (arg
));
7806 else if (flag_pedantic_errors
)
7814 ((TREE_CODE (arg
) == TEMPLATE_DECL
7815 && TREE_CODE (DECL_TEMPLATE_RESULT (arg
)) == TYPE_DECL
)
7816 || (requires_tmpl_type
&& TREE_CODE (arg
) == TYPE_ARGUMENT_PACK
)
7817 || TREE_CODE (arg
) == TEMPLATE_TEMPLATE_PARM
7818 || TREE_CODE (arg
) == UNBOUND_CLASS_TEMPLATE
);
7821 && (TREE_CODE (arg
) == TEMPLATE_TEMPLATE_PARM
7822 || TREE_CODE (arg
) == UNBOUND_CLASS_TEMPLATE
))
7823 arg
= TYPE_STUB_DECL (arg
);
7825 is_type
= TYPE_P (arg
) || is_tmpl_type
;
7827 if (requires_type
&& ! is_type
&& TREE_CODE (arg
) == SCOPE_REF
7828 && TREE_CODE (TREE_OPERAND (arg
, 0)) == TEMPLATE_TYPE_PARM
)
7830 if (TREE_CODE (TREE_OPERAND (arg
, 1)) == BIT_NOT_EXPR
)
7832 if (complain
& tf_error
)
7833 error ("invalid use of destructor %qE as a type", orig_arg
);
7834 return error_mark_node
;
7837 permerror (input_location
,
7838 "to refer to a type member of a template parameter, "
7839 "use %<typename %E%>", orig_arg
);
7841 orig_arg
= make_typename_type (TREE_OPERAND (arg
, 0),
7842 TREE_OPERAND (arg
, 1),
7848 if (is_type
!= requires_type
)
7852 if (complain
& tf_error
)
7854 error ("type/value mismatch at argument %d in template "
7855 "parameter list for %qD",
7858 inform (input_location
,
7859 " expected a constant of type %qT, got %qT",
7861 (DECL_P (arg
) ? DECL_NAME (arg
) : orig_arg
));
7862 else if (requires_tmpl_type
)
7863 inform (input_location
,
7864 " expected a class template, got %qE", orig_arg
);
7866 inform (input_location
,
7867 " expected a type, got %qE", orig_arg
);
7870 return error_mark_node
;
7872 if (is_tmpl_type
^ requires_tmpl_type
)
7874 if (in_decl
&& (complain
& tf_error
))
7876 error ("type/value mismatch at argument %d in template "
7877 "parameter list for %qD",
7880 inform (input_location
,
7881 " expected a type, got %qT", DECL_NAME (arg
));
7883 inform (input_location
,
7884 " expected a class template, got %qT", orig_arg
);
7886 return error_mark_node
;
7889 if (template_parameter_pack_p (parm
) && ARGUMENT_PACK_P (orig_arg
))
7890 /* We already did the appropriate conversion when packing args. */
7894 if (requires_tmpl_type
)
7896 if (TREE_CODE (TREE_TYPE (arg
)) == UNBOUND_CLASS_TEMPLATE
)
7897 /* The number of argument required is not known yet.
7898 Just accept it for now. */
7902 tree parmparm
= DECL_INNERMOST_TEMPLATE_PARMS (parm
);
7905 /* Strip alias templates that are equivalent to another
7907 arg
= get_underlying_template (arg
);
7908 argparm
= DECL_INNERMOST_TEMPLATE_PARMS (arg
);
7910 if (coerce_template_template_parms (parmparm
, argparm
,
7916 /* TEMPLATE_TEMPLATE_PARM node is preferred over
7918 if (val
!= error_mark_node
)
7920 if (DECL_TEMPLATE_TEMPLATE_PARM_P (val
))
7921 val
= TREE_TYPE (val
);
7922 if (TREE_CODE (orig_arg
) == TYPE_PACK_EXPANSION
)
7923 val
= make_pack_expansion (val
, complain
);
7928 if (in_decl
&& (complain
& tf_error
))
7930 error ("type/value mismatch at argument %d in "
7931 "template parameter list for %qD",
7933 inform (input_location
,
7934 " expected a template of type %qD, got %qT",
7938 val
= error_mark_node
;
7941 // Check that the constraints are compatible before allowing the
7943 if (val
!= error_mark_node
)
7944 if (!is_compatible_template_arg (parm
, arg
))
7946 if (in_decl
&& (complain
& tf_error
))
7948 error ("constraint mismatch at argument %d in "
7949 "template parameter list for %qD",
7951 inform (input_location
, " expected %qD but got %qD",
7954 val
= error_mark_node
;
7960 /* We only form one instance of each template specialization.
7961 Therefore, if we use a non-canonical variant (i.e., a
7962 typedef), any future messages referring to the type will use
7963 the typedef, which is confusing if those future uses do not
7964 themselves also use the typedef. */
7966 val
= canonicalize_type_argument (val
, complain
);
7970 tree t
= TREE_TYPE (parm
);
7972 if (TEMPLATE_PARM_LEVEL (get_template_parm_index (parm
))
7973 > TMPL_ARGS_DEPTH (args
))
7974 /* We don't have enough levels of args to do any substitution. This
7975 can happen in the context of -fnew-ttp-matching. */;
7976 else if (tree a
= type_uses_auto (t
))
7978 t
= do_auto_deduction (t
, arg
, a
, complain
, adc_unify
, args
);
7979 if (t
== error_mark_node
)
7980 return error_mark_node
;
7983 t
= tsubst (t
, args
, complain
, in_decl
);
7985 if (invalid_nontype_parm_type_p (t
, complain
))
7986 return error_mark_node
;
7988 if (!type_dependent_expression_p (orig_arg
)
7989 && !uses_template_parms (t
))
7990 /* We used to call digest_init here. However, digest_init
7991 will report errors, which we don't want when complain
7992 is zero. More importantly, digest_init will try too
7993 hard to convert things: for example, `0' should not be
7994 converted to pointer type at this point according to
7995 the standard. Accepting this is not merely an
7996 extension, since deciding whether or not these
7997 conversions can occur is part of determining which
7998 function template to call, or whether a given explicit
7999 argument specification is valid. */
8000 val
= convert_nontype_argument (t
, orig_arg
, complain
);
8003 val
= canonicalize_expr_argument (orig_arg
, complain
);
8004 val
= maybe_convert_nontype_argument (t
, val
);
8008 if (val
== NULL_TREE
)
8009 val
= error_mark_node
;
8010 else if (val
== error_mark_node
&& (complain
& tf_error
))
8011 error ("could not convert template argument %qE from %qT to %qT",
8012 orig_arg
, TREE_TYPE (orig_arg
), t
);
8014 if (INDIRECT_REF_P (val
))
8016 /* Reject template arguments that are references to built-in
8017 functions with no library fallbacks. */
8018 const_tree inner
= TREE_OPERAND (val
, 0);
8019 const_tree innertype
= TREE_TYPE (inner
);
8021 && TREE_CODE (innertype
) == REFERENCE_TYPE
8022 && TREE_CODE (TREE_TYPE (innertype
)) == FUNCTION_TYPE
8023 && TREE_OPERAND_LENGTH (inner
) > 0
8024 && reject_gcc_builtin (TREE_OPERAND (inner
, 0)))
8025 return error_mark_node
;
8028 if (TREE_CODE (val
) == SCOPE_REF
)
8030 /* Strip typedefs from the SCOPE_REF. */
8031 tree type
= canonicalize_type_argument (TREE_TYPE (val
), complain
);
8032 tree scope
= canonicalize_type_argument (TREE_OPERAND (val
, 0),
8034 val
= build_qualified_name (type
, scope
, TREE_OPERAND (val
, 1),
8035 QUALIFIED_NAME_IS_TEMPLATE (val
));
8042 /* Coerces the remaining template arguments in INNER_ARGS (from
8043 ARG_IDX to the end) into the parameter pack at PARM_IDX in PARMS.
8044 Returns the coerced argument pack. PARM_IDX is the position of this
8045 parameter in the template parameter list. ARGS is the original
8046 template argument list. */
8048 coerce_template_parameter_pack (tree parms
,
8056 tsubst_flags_t complain
)
8058 tree parm
= TREE_VEC_ELT (parms
, parm_idx
);
8059 int nargs
= inner_args
? NUM_TMPL_ARGS (inner_args
) : 0;
8062 tree packed_parms
= NULL_TREE
;
8064 if (arg_idx
> nargs
)
8067 if (tree packs
= fixed_parameter_pack_p (TREE_VALUE (parm
)))
8069 /* When the template parameter is a non-type template parameter pack
8070 or template template parameter pack whose type or template
8071 parameters use parameter packs, we know exactly how many arguments
8072 we are looking for. Build a vector of the instantiated decls for
8073 these template parameters in PACKED_PARMS. */
8074 /* We can't use make_pack_expansion here because it would interpret a
8075 _DECL as a use rather than a declaration. */
8076 tree decl
= TREE_VALUE (parm
);
8077 tree exp
= cxx_make_type (TYPE_PACK_EXPANSION
);
8078 SET_PACK_EXPANSION_PATTERN (exp
, decl
);
8079 PACK_EXPANSION_PARAMETER_PACKS (exp
) = packs
;
8080 SET_TYPE_STRUCTURAL_EQUALITY (exp
);
8082 TREE_VEC_LENGTH (args
)--;
8083 packed_parms
= tsubst_pack_expansion (exp
, args
, complain
, decl
);
8084 TREE_VEC_LENGTH (args
)++;
8086 if (packed_parms
== error_mark_node
)
8087 return error_mark_node
;
8089 /* If we're doing a partial instantiation of a member template,
8090 verify that all of the types used for the non-type
8091 template parameter pack are, in fact, valid for non-type
8092 template parameters. */
8094 && PACK_EXPANSION_P (TREE_VEC_ELT (inner_args
, arg_idx
)))
8096 int j
, len
= TREE_VEC_LENGTH (packed_parms
);
8097 for (j
= 0; j
< len
; ++j
)
8099 tree t
= TREE_TYPE (TREE_VEC_ELT (packed_parms
, j
));
8100 if (invalid_nontype_parm_type_p (t
, complain
))
8101 return error_mark_node
;
8103 /* We don't know how many args we have yet, just
8104 use the unconverted ones for now. */
8108 packed_args
= make_tree_vec (TREE_VEC_LENGTH (packed_parms
));
8110 /* Check if we have a placeholder pack, which indicates we're
8111 in the context of a introduction list. In that case we want
8112 to match this pack to the single placeholder. */
8113 else if (arg_idx
< nargs
8114 && TREE_CODE (TREE_VEC_ELT (inner_args
, arg_idx
)) == WILDCARD_DECL
8115 && WILDCARD_PACK_P (TREE_VEC_ELT (inner_args
, arg_idx
)))
8117 nargs
= arg_idx
+ 1;
8118 packed_args
= make_tree_vec (1);
8121 packed_args
= make_tree_vec (nargs
- arg_idx
);
8123 /* Convert the remaining arguments, which will be a part of the
8124 parameter pack "parm". */
8125 int first_pack_arg
= arg_idx
;
8126 for (; arg_idx
< nargs
; ++arg_idx
)
8128 tree arg
= TREE_VEC_ELT (inner_args
, arg_idx
);
8129 tree actual_parm
= TREE_VALUE (parm
);
8130 int pack_idx
= arg_idx
- first_pack_arg
;
8134 /* Once we've packed as many args as we have types, stop. */
8135 if (pack_idx
>= TREE_VEC_LENGTH (packed_parms
))
8137 else if (PACK_EXPANSION_P (arg
))
8138 /* We don't know how many args we have yet, just
8139 use the unconverted ones for now. */
8142 actual_parm
= TREE_VEC_ELT (packed_parms
, pack_idx
);
8145 if (arg
== error_mark_node
)
8147 if (complain
& tf_error
)
8148 error ("template argument %d is invalid", arg_idx
+ 1);
8151 arg
= convert_template_argument (actual_parm
,
8152 arg
, new_args
, complain
, parm_idx
,
8154 if (arg
== error_mark_node
)
8156 TREE_VEC_ELT (packed_args
, pack_idx
) = arg
;
8159 if (arg_idx
- first_pack_arg
< TREE_VEC_LENGTH (packed_args
)
8160 && TREE_VEC_LENGTH (packed_args
) > 0)
8162 if (complain
& tf_error
)
8163 error ("wrong number of template arguments (%d, should be %d)",
8164 arg_idx
- first_pack_arg
, TREE_VEC_LENGTH (packed_args
));
8165 return error_mark_node
;
8168 if (TREE_CODE (TREE_VALUE (parm
)) == TYPE_DECL
8169 || TREE_CODE (TREE_VALUE (parm
)) == TEMPLATE_DECL
)
8170 argument_pack
= cxx_make_type (TYPE_ARGUMENT_PACK
);
8173 argument_pack
= make_node (NONTYPE_ARGUMENT_PACK
);
8174 TREE_CONSTANT (argument_pack
) = 1;
8177 SET_ARGUMENT_PACK_ARGS (argument_pack
, packed_args
);
8179 SET_NON_DEFAULT_TEMPLATE_ARGS_COUNT (packed_args
,
8180 TREE_VEC_LENGTH (packed_args
));
8181 return argument_pack
;
8184 /* Returns the number of pack expansions in the template argument vector
8188 pack_expansion_args_count (tree args
)
8193 for (i
= 0; i
< TREE_VEC_LENGTH (args
); ++i
)
8195 tree elt
= TREE_VEC_ELT (args
, i
);
8196 if (elt
&& PACK_EXPANSION_P (elt
))
8202 /* Convert all template arguments to their appropriate types, and
8203 return a vector containing the innermost resulting template
8204 arguments. If any error occurs, return error_mark_node. Error and
8205 warning messages are issued under control of COMPLAIN.
8207 If REQUIRE_ALL_ARGS is false, argument deduction will be performed
8208 for arguments not specified in ARGS. Otherwise, if
8209 USE_DEFAULT_ARGS is true, default arguments will be used to fill in
8210 unspecified arguments. If REQUIRE_ALL_ARGS is true, but
8211 USE_DEFAULT_ARGS is false, then all arguments must be specified in
8215 coerce_template_parms (tree parms
,
8218 tsubst_flags_t complain
,
8219 bool require_all_args
,
8220 bool use_default_args
)
8222 int nparms
, nargs
, parm_idx
, arg_idx
, lost
= 0;
8223 tree orig_inner_args
;
8226 tree new_inner_args
;
8227 int saved_unevaluated_operand
;
8228 int saved_inhibit_evaluation_warnings
;
8230 /* When used as a boolean value, indicates whether this is a
8231 variadic template parameter list. Since it's an int, we can also
8232 subtract it from nparms to get the number of non-variadic
8235 int variadic_args_p
= 0;
8236 int post_variadic_parms
= 0;
8238 /* Adjustment to nparms for fixed parameter packs. */
8239 int fixed_pack_adjust
= 0;
8240 int fixed_packs
= 0;
8243 /* Likewise for parameters with default arguments. */
8246 if (args
== error_mark_node
)
8247 return error_mark_node
;
8249 nparms
= TREE_VEC_LENGTH (parms
);
8251 /* Determine if there are any parameter packs or default arguments. */
8252 for (parm_idx
= 0; parm_idx
< nparms
; ++parm_idx
)
8254 tree parm
= TREE_VEC_ELT (parms
, parm_idx
);
8256 ++post_variadic_parms
;
8257 if (template_parameter_pack_p (TREE_VALUE (parm
)))
8259 if (TREE_PURPOSE (parm
))
8263 inner_args
= orig_inner_args
= INNERMOST_TEMPLATE_ARGS (args
);
8264 /* If there are no parameters that follow a parameter pack, we need to
8265 expand any argument packs so that we can deduce a parameter pack from
8266 some non-packed args followed by an argument pack, as in variadic85.C.
8267 If there are such parameters, we need to leave argument packs intact
8268 so the arguments are assigned properly. This can happen when dealing
8269 with a nested class inside a partial specialization of a class
8270 template, as in variadic92.C, or when deducing a template parameter pack
8271 from a sub-declarator, as in variadic114.C. */
8272 if (!post_variadic_parms
)
8273 inner_args
= expand_template_argument_pack (inner_args
);
8275 /* Count any pack expansion args. */
8276 variadic_args_p
= pack_expansion_args_count (inner_args
);
8278 nargs
= inner_args
? NUM_TMPL_ARGS (inner_args
) : 0;
8279 if ((nargs
- variadic_args_p
> nparms
&& !variadic_p
)
8280 || (nargs
< nparms
- variadic_p
8283 && (!use_default_args
8284 || (TREE_VEC_ELT (parms
, nargs
) != error_mark_node
8285 && !TREE_PURPOSE (TREE_VEC_ELT (parms
, nargs
))))))
8288 if (complain
& tf_error
)
8290 if (variadic_p
|| default_p
)
8292 nparms
-= variadic_p
+ default_p
;
8293 error ("wrong number of template arguments "
8294 "(%d, should be at least %d)", nargs
, nparms
);
8297 error ("wrong number of template arguments "
8298 "(%d, should be %d)", nargs
, nparms
);
8301 inform (DECL_SOURCE_LOCATION (in_decl
),
8302 "provided for %qD", in_decl
);
8305 return error_mark_node
;
8307 /* We can't pass a pack expansion to a non-pack parameter of an alias
8308 template (DR 1430). */
8310 && (DECL_ALIAS_TEMPLATE_P (in_decl
)
8311 || concept_template_p (in_decl
))
8313 && nargs
- variadic_args_p
< nparms
- variadic_p
)
8315 if (complain
& tf_error
)
8317 for (int i
= 0; i
< TREE_VEC_LENGTH (inner_args
); ++i
)
8319 tree arg
= TREE_VEC_ELT (inner_args
, i
);
8320 tree parm
= TREE_VALUE (TREE_VEC_ELT (parms
, i
));
8322 if (PACK_EXPANSION_P (arg
)
8323 && !template_parameter_pack_p (parm
))
8325 if (DECL_ALIAS_TEMPLATE_P (in_decl
))
8326 error_at (location_of (arg
),
8327 "pack expansion argument for non-pack parameter "
8328 "%qD of alias template %qD", parm
, in_decl
);
8330 error_at (location_of (arg
),
8331 "pack expansion argument for non-pack parameter "
8332 "%qD of concept %qD", parm
, in_decl
);
8333 inform (DECL_SOURCE_LOCATION (parm
), "declared here");
8340 return error_mark_node
;
8343 /* We need to evaluate the template arguments, even though this
8344 template-id may be nested within a "sizeof". */
8345 saved_unevaluated_operand
= cp_unevaluated_operand
;
8346 cp_unevaluated_operand
= 0;
8347 saved_inhibit_evaluation_warnings
= c_inhibit_evaluation_warnings
;
8348 c_inhibit_evaluation_warnings
= 0;
8349 new_inner_args
= make_tree_vec (nparms
);
8350 new_args
= add_outermost_template_args (args
, new_inner_args
);
8351 int pack_adjust
= 0;
8352 for (parm_idx
= 0, arg_idx
= 0; parm_idx
< nparms
; parm_idx
++, arg_idx
++)
8357 /* Get the Ith template parameter. */
8358 parm
= TREE_VEC_ELT (parms
, parm_idx
);
8360 if (parm
== error_mark_node
)
8362 TREE_VEC_ELT (new_inner_args
, arg_idx
) = error_mark_node
;
8366 /* Calculate the next argument. */
8367 if (arg_idx
< nargs
)
8368 arg
= TREE_VEC_ELT (inner_args
, arg_idx
);
8372 if (template_parameter_pack_p (TREE_VALUE (parm
))
8373 && !(arg
&& ARGUMENT_PACK_P (arg
)))
8375 /* Some arguments will be placed in the
8376 template parameter pack PARM. */
8377 arg
= coerce_template_parameter_pack (parms
, parm_idx
, args
,
8378 inner_args
, arg_idx
,
8382 if (arg
== NULL_TREE
)
8384 /* We don't know how many args we have yet, just use the
8385 unconverted (and still packed) ones for now. */
8386 new_inner_args
= orig_inner_args
;
8391 TREE_VEC_ELT (new_inner_args
, parm_idx
) = arg
;
8393 /* Store this argument. */
8394 if (arg
== error_mark_node
)
8397 /* We are done with all of the arguments. */
8403 pack_adjust
= TREE_VEC_LENGTH (ARGUMENT_PACK_ARGS (arg
)) - 1;
8404 arg_idx
+= pack_adjust
;
8405 if (fixed_parameter_pack_p (TREE_VALUE (parm
)))
8408 fixed_pack_adjust
+= pack_adjust
;
8416 if (PACK_EXPANSION_P (arg
))
8418 /* "If every valid specialization of a variadic template
8419 requires an empty template parameter pack, the template is
8420 ill-formed, no diagnostic required." So check that the
8421 pattern works with this parameter. */
8422 tree pattern
= PACK_EXPANSION_PATTERN (arg
);
8423 tree conv
= convert_template_argument (TREE_VALUE (parm
),
8427 if (conv
== error_mark_node
)
8429 if (complain
& tf_error
)
8430 inform (input_location
, "so any instantiation with a "
8431 "non-empty parameter pack would be ill-formed");
8434 else if (TYPE_P (conv
) && !TYPE_P (pattern
))
8435 /* Recover from missing typename. */
8436 TREE_VEC_ELT (inner_args
, arg_idx
)
8437 = make_pack_expansion (conv
, complain
);
8439 /* We don't know how many args we have yet, just
8440 use the unconverted ones for now. */
8441 new_inner_args
= inner_args
;
8446 else if (require_all_args
)
8448 /* There must be a default arg in this case. */
8449 arg
= tsubst_template_arg (TREE_PURPOSE (parm
), new_args
,
8451 /* The position of the first default template argument,
8452 is also the number of non-defaulted arguments in NEW_INNER_ARGS.
8454 if (!NON_DEFAULT_TEMPLATE_ARGS_COUNT (new_inner_args
))
8455 SET_NON_DEFAULT_TEMPLATE_ARGS_COUNT (new_inner_args
,
8456 arg_idx
- pack_adjust
);
8461 if (arg
== error_mark_node
)
8463 if (complain
& tf_error
)
8464 error ("template argument %d is invalid", arg_idx
+ 1);
8468 /* This can occur if there was an error in the template
8469 parameter list itself (which we would already have
8470 reported) that we are trying to recover from, e.g., a class
8471 template with a parameter list such as
8472 template<typename..., typename> (cpp0x/variadic150.C). */
8475 /* This can also happen with a fixed parameter pack (71834). */
8476 if (arg_idx
>= nargs
)
8480 arg
= convert_template_argument (TREE_VALUE (parm
),
8481 arg
, new_args
, complain
,
8484 if (arg
== error_mark_node
)
8486 TREE_VEC_ELT (new_inner_args
, arg_idx
- pack_adjust
) = arg
;
8488 cp_unevaluated_operand
= saved_unevaluated_operand
;
8489 c_inhibit_evaluation_warnings
= saved_inhibit_evaluation_warnings
;
8491 if (missing
|| arg_idx
< nargs
- variadic_args_p
)
8493 /* If we had fixed parameter packs, we didn't know how many arguments we
8494 actually needed earlier; now we do. */
8495 nparms
+= fixed_pack_adjust
;
8496 variadic_p
-= fixed_packs
;
8500 if (arg_idx
< nargs
)
8502 /* We had some pack expansion arguments that will only work if the packs
8503 are empty, but wait until instantiation time to complain.
8504 See variadic-ttp3.C. */
8505 int len
= nparms
+ (nargs
- arg_idx
);
8506 tree args
= make_tree_vec (len
);
8508 for (; i
< nparms
; ++i
)
8509 TREE_VEC_ELT (args
, i
) = TREE_VEC_ELT (new_inner_args
, i
);
8510 for (; i
< len
; ++i
, ++arg_idx
)
8511 TREE_VEC_ELT (args
, i
) = TREE_VEC_ELT (inner_args
,
8512 arg_idx
- pack_adjust
);
8513 new_inner_args
= args
;
8518 gcc_assert (!(complain
& tf_error
) || seen_error ());
8519 return error_mark_node
;
8522 if (CHECKING_P
&& !NON_DEFAULT_TEMPLATE_ARGS_COUNT (new_inner_args
))
8523 SET_NON_DEFAULT_TEMPLATE_ARGS_COUNT (new_inner_args
,
8524 TREE_VEC_LENGTH (new_inner_args
));
8526 return new_inner_args
;
8529 /* Convert all template arguments to their appropriate types, and
8530 return a vector containing the innermost resulting template
8531 arguments. If any error occurs, return error_mark_node. Error and
8532 warning messages are not issued.
8534 Note that no function argument deduction is performed, and default
8535 arguments are used to fill in unspecified arguments. */
8537 coerce_template_parms (tree parms
, tree args
, tree in_decl
)
8539 return coerce_template_parms (parms
, args
, in_decl
, tf_none
, true, true);
8542 /* Convert all template arguments to their appropriate type, and
8543 instantiate default arguments as needed. This returns a vector
8544 containing the innermost resulting template arguments, or
8545 error_mark_node if unsuccessful. */
8547 coerce_template_parms (tree parms
, tree args
, tree in_decl
,
8548 tsubst_flags_t complain
)
8550 return coerce_template_parms (parms
, args
, in_decl
, complain
, true, true);
8553 /* Like coerce_template_parms. If PARMS represents all template
8554 parameters levels, this function returns a vector of vectors
8555 representing all the resulting argument levels. Note that in this
8556 case, only the innermost arguments are coerced because the
8557 outermost ones are supposed to have been coerced already.
8559 Otherwise, if PARMS represents only (the innermost) vector of
8560 parameters, this function returns a vector containing just the
8561 innermost resulting arguments. */
8564 coerce_innermost_template_parms (tree parms
,
8567 tsubst_flags_t complain
,
8568 bool require_all_args
,
8569 bool use_default_args
)
8571 int parms_depth
= TMPL_PARMS_DEPTH (parms
);
8572 int args_depth
= TMPL_ARGS_DEPTH (args
);
8575 if (parms_depth
> 1)
8577 coerced_args
= make_tree_vec (parms_depth
);
8581 for (level
= parms
, cur_depth
= parms_depth
;
8582 parms_depth
> 0 && level
!= NULL_TREE
;
8583 level
= TREE_CHAIN (level
), --cur_depth
)
8586 if (cur_depth
== args_depth
)
8587 l
= coerce_template_parms (TREE_VALUE (level
),
8588 args
, in_decl
, complain
,
8592 l
= TMPL_ARGS_LEVEL (args
, cur_depth
);
8594 if (l
== error_mark_node
)
8595 return error_mark_node
;
8597 SET_TMPL_ARGS_LEVEL (coerced_args
, cur_depth
, l
);
8601 coerced_args
= coerce_template_parms (INNERMOST_TEMPLATE_PARMS (parms
),
8602 args
, in_decl
, complain
,
8605 return coerced_args
;
8608 /* Returns 1 if template args OT and NT are equivalent. */
8611 template_args_equal (tree ot
, tree nt
, bool partial_order
/* = false */)
8615 if (nt
== NULL_TREE
|| ot
== NULL_TREE
)
8617 if (nt
== any_targ_node
|| ot
== any_targ_node
)
8620 if (TREE_CODE (nt
) == TREE_VEC
)
8621 /* For member templates */
8622 return TREE_CODE (ot
) == TREE_VEC
&& comp_template_args (ot
, nt
);
8623 else if (PACK_EXPANSION_P (ot
))
8624 return (PACK_EXPANSION_P (nt
)
8625 && template_args_equal (PACK_EXPANSION_PATTERN (ot
),
8626 PACK_EXPANSION_PATTERN (nt
))
8627 && template_args_equal (PACK_EXPANSION_EXTRA_ARGS (ot
),
8628 PACK_EXPANSION_EXTRA_ARGS (nt
)));
8629 else if (ARGUMENT_PACK_P (ot
))
8634 if (!ARGUMENT_PACK_P (nt
))
8637 opack
= ARGUMENT_PACK_ARGS (ot
);
8638 npack
= ARGUMENT_PACK_ARGS (nt
);
8639 len
= TREE_VEC_LENGTH (opack
);
8640 if (TREE_VEC_LENGTH (npack
) != len
)
8642 for (i
= 0; i
< len
; ++i
)
8643 if (!template_args_equal (TREE_VEC_ELT (opack
, i
),
8644 TREE_VEC_ELT (npack
, i
)))
8648 else if (ot
&& TREE_CODE (ot
) == ARGUMENT_PACK_SELECT
)
8650 else if (TYPE_P (nt
))
8654 /* Don't treat an alias template specialization with dependent
8655 arguments as equivalent to its underlying type when used as a
8656 template argument; we need them to be distinct so that we
8657 substitute into the specialization arguments at instantiation
8658 time. And aliases can't be equivalent without being ==, so
8659 we don't need to look any deeper.
8661 During partial ordering, however, we need to treat them normally so
8662 that we can order uses of the same alias with different
8663 cv-qualification (79960). */
8665 && (TYPE_ALIAS_P (nt
) || TYPE_ALIAS_P (ot
)))
8668 return same_type_p (ot
, nt
);
8670 else if (TREE_CODE (ot
) == TREE_VEC
|| TYPE_P (ot
))
8674 /* Try to treat a template non-type argument that has been converted
8675 to the parameter type as equivalent to one that hasn't yet. */
8676 for (enum tree_code code1
= TREE_CODE (ot
);
8677 CONVERT_EXPR_CODE_P (code1
)
8678 || code1
== NON_LVALUE_EXPR
;
8679 code1
= TREE_CODE (ot
))
8680 ot
= TREE_OPERAND (ot
, 0);
8681 for (enum tree_code code2
= TREE_CODE (nt
);
8682 CONVERT_EXPR_CODE_P (code2
)
8683 || code2
== NON_LVALUE_EXPR
;
8684 code2
= TREE_CODE (nt
))
8685 nt
= TREE_OPERAND (nt
, 0);
8687 return cp_tree_equal (ot
, nt
);
8691 /* Returns 1 iff the OLDARGS and NEWARGS are in fact identical sets of
8692 template arguments. Returns 0 otherwise, and updates OLDARG_PTR and
8693 NEWARG_PTR with the offending arguments if they are non-NULL. */
8696 comp_template_args (tree oldargs
, tree newargs
,
8697 tree
*oldarg_ptr
, tree
*newarg_ptr
,
8702 if (oldargs
== newargs
)
8705 if (!oldargs
|| !newargs
)
8708 if (TREE_VEC_LENGTH (oldargs
) != TREE_VEC_LENGTH (newargs
))
8711 for (i
= 0; i
< TREE_VEC_LENGTH (oldargs
); ++i
)
8713 tree nt
= TREE_VEC_ELT (newargs
, i
);
8714 tree ot
= TREE_VEC_ELT (oldargs
, i
);
8716 if (! template_args_equal (ot
, nt
, partial_order
))
8718 if (oldarg_ptr
!= NULL
)
8720 if (newarg_ptr
!= NULL
)
8729 comp_template_args_porder (tree oargs
, tree nargs
)
8731 return comp_template_args (oargs
, nargs
, NULL
, NULL
, true);
8735 add_pending_template (tree d
)
8737 tree ti
= (TYPE_P (d
)
8738 ? CLASSTYPE_TEMPLATE_INFO (d
)
8739 : DECL_TEMPLATE_INFO (d
));
8740 struct pending_template
*pt
;
8743 if (TI_PENDING_TEMPLATE_FLAG (ti
))
8746 /* We are called both from instantiate_decl, where we've already had a
8747 tinst_level pushed, and instantiate_template, where we haven't.
8749 level
= !current_tinst_level
|| current_tinst_level
->decl
!= d
;
8752 push_tinst_level (d
);
8754 pt
= ggc_alloc
<pending_template
> ();
8756 pt
->tinst
= current_tinst_level
;
8757 if (last_pending_template
)
8758 last_pending_template
->next
= pt
;
8760 pending_templates
= pt
;
8762 last_pending_template
= pt
;
8764 TI_PENDING_TEMPLATE_FLAG (ti
) = 1;
8771 /* Return a TEMPLATE_ID_EXPR corresponding to the indicated FNS and
8772 ARGLIST. Valid choices for FNS are given in the cp-tree.def
8773 documentation for TEMPLATE_ID_EXPR. */
8776 lookup_template_function (tree fns
, tree arglist
)
8780 if (fns
== error_mark_node
|| arglist
== error_mark_node
)
8781 return error_mark_node
;
8783 gcc_assert (!arglist
|| TREE_CODE (arglist
) == TREE_VEC
);
8785 if (!is_overloaded_fn (fns
) && !identifier_p (fns
))
8787 error ("%q#D is not a function template", fns
);
8788 return error_mark_node
;
8791 if (BASELINK_P (fns
))
8793 BASELINK_FUNCTIONS (fns
) = build2 (TEMPLATE_ID_EXPR
,
8795 BASELINK_FUNCTIONS (fns
),
8800 type
= TREE_TYPE (fns
);
8801 if (TREE_CODE (fns
) == OVERLOAD
|| !type
)
8802 type
= unknown_type_node
;
8804 return build2 (TEMPLATE_ID_EXPR
, type
, fns
, arglist
);
8807 /* Within the scope of a template class S<T>, the name S gets bound
8808 (in build_self_reference) to a TYPE_DECL for the class, not a
8809 TEMPLATE_DECL. If DECL is a TYPE_DECL for current_class_type,
8810 or one of its enclosing classes, and that type is a template,
8811 return the associated TEMPLATE_DECL. Otherwise, the original
8814 Also handle the case when DECL is a TREE_LIST of ambiguous
8815 injected-class-names from different bases. */
8818 maybe_get_template_decl_from_type_decl (tree decl
)
8820 if (decl
== NULL_TREE
)
8823 /* DR 176: A lookup that finds an injected-class-name (10.2
8824 [class.member.lookup]) can result in an ambiguity in certain cases
8825 (for example, if it is found in more than one base class). If all of
8826 the injected-class-names that are found refer to specializations of
8827 the same class template, and if the name is followed by a
8828 template-argument-list, the reference refers to the class template
8829 itself and not a specialization thereof, and is not ambiguous. */
8830 if (TREE_CODE (decl
) == TREE_LIST
)
8832 tree t
, tmpl
= NULL_TREE
;
8833 for (t
= decl
; t
; t
= TREE_CHAIN (t
))
8835 tree elt
= maybe_get_template_decl_from_type_decl (TREE_VALUE (t
));
8838 else if (tmpl
!= elt
)
8841 if (tmpl
&& t
== NULL_TREE
)
8847 return (decl
!= NULL_TREE
8848 && DECL_SELF_REFERENCE_P (decl
)
8849 && CLASSTYPE_TEMPLATE_INFO (TREE_TYPE (decl
)))
8850 ? CLASSTYPE_TI_TEMPLATE (TREE_TYPE (decl
)) : decl
;
8853 /* Given an IDENTIFIER_NODE (or type TEMPLATE_DECL) and a chain of
8854 parameters, find the desired type.
8856 D1 is the PTYPENAME terminal, and ARGLIST is the list of arguments.
8858 IN_DECL, if non-NULL, is the template declaration we are trying to
8861 If ENTERING_SCOPE is nonzero, we are about to enter the scope of
8862 the class we are looking up.
8864 Issue error and warning messages under control of COMPLAIN.
8866 If the template class is really a local class in a template
8867 function, then the FUNCTION_CONTEXT is the function in which it is
8870 ??? Note that this function is currently called *twice* for each
8871 template-id: the first time from the parser, while creating the
8872 incomplete type (finish_template_type), and the second type during the
8873 real instantiation (instantiate_template_class). This is surely something
8874 that we want to avoid. It also causes some problems with argument
8875 coercion (see convert_nontype_argument for more information on this). */
8878 lookup_template_class_1 (tree d1
, tree arglist
, tree in_decl
, tree context
,
8879 int entering_scope
, tsubst_flags_t complain
)
8881 tree templ
= NULL_TREE
, parmlist
;
8888 if (identifier_p (d1
))
8890 tree value
= innermost_non_namespace_value (d1
);
8891 if (value
&& DECL_TEMPLATE_TEMPLATE_PARM_P (value
))
8896 push_decl_namespace (context
);
8897 templ
= lookup_name (d1
);
8898 templ
= maybe_get_template_decl_from_type_decl (templ
);
8900 pop_decl_namespace ();
8903 context
= DECL_CONTEXT (templ
);
8905 else if (TREE_CODE (d1
) == TYPE_DECL
&& MAYBE_CLASS_TYPE_P (TREE_TYPE (d1
)))
8907 tree type
= TREE_TYPE (d1
);
8909 /* If we are declaring a constructor, say A<T>::A<T>, we will get
8910 an implicit typename for the second A. Deal with it. */
8911 if (TREE_CODE (type
) == TYPENAME_TYPE
&& TREE_TYPE (type
))
8912 type
= TREE_TYPE (type
);
8914 if (CLASSTYPE_TEMPLATE_INFO (type
))
8916 templ
= CLASSTYPE_TI_TEMPLATE (type
);
8917 d1
= DECL_NAME (templ
);
8920 else if (TREE_CODE (d1
) == ENUMERAL_TYPE
8921 || (TYPE_P (d1
) && MAYBE_CLASS_TYPE_P (d1
)))
8923 templ
= TYPE_TI_TEMPLATE (d1
);
8924 d1
= DECL_NAME (templ
);
8926 else if (DECL_TYPE_TEMPLATE_P (d1
))
8929 d1
= DECL_NAME (templ
);
8930 context
= DECL_CONTEXT (templ
);
8932 else if (DECL_TEMPLATE_TEMPLATE_PARM_P (d1
))
8935 d1
= DECL_NAME (templ
);
8938 /* Issue an error message if we didn't find a template. */
8941 if (complain
& tf_error
)
8942 error ("%qT is not a template", d1
);
8943 return error_mark_node
;
8946 if (TREE_CODE (templ
) != TEMPLATE_DECL
8947 /* Make sure it's a user visible template, if it was named by
8949 || ((complain
& tf_user
) && !DECL_TEMPLATE_PARM_P (templ
)
8950 && !PRIMARY_TEMPLATE_P (templ
)))
8952 if (complain
& tf_error
)
8954 error ("non-template type %qT used as a template", d1
);
8956 error ("for template declaration %q+D", in_decl
);
8958 return error_mark_node
;
8961 complain
&= ~tf_user
;
8963 /* An alias that just changes the name of a template is equivalent to the
8964 other template, so if any of the arguments are pack expansions, strip
8965 the alias to avoid problems with a pack expansion passed to a non-pack
8966 alias template parameter (DR 1430). */
8967 if (pack_expansion_args_count (INNERMOST_TEMPLATE_ARGS (arglist
)))
8968 templ
= get_underlying_template (templ
);
8970 if (DECL_TEMPLATE_TEMPLATE_PARM_P (templ
))
8973 tree arglist2
= coerce_template_args_for_ttp (templ
, arglist
, complain
);
8974 if (arglist2
== error_mark_node
8975 || (!uses_template_parms (arglist2
)
8976 && check_instantiated_args (templ
, arglist2
, complain
)))
8977 return error_mark_node
;
8979 parm
= bind_template_template_parm (TREE_TYPE (templ
), arglist2
);
8984 tree template_type
= TREE_TYPE (templ
);
8987 tree found
= NULL_TREE
;
8990 int is_dependent_type
;
8991 int use_partial_inst_tmpl
= false;
8993 if (template_type
== error_mark_node
)
8994 /* An error occurred while building the template TEMPL, and a
8995 diagnostic has most certainly been emitted for that
8996 already. Let's propagate that error. */
8997 return error_mark_node
;
8999 gen_tmpl
= most_general_template (templ
);
9000 parmlist
= DECL_TEMPLATE_PARMS (gen_tmpl
);
9001 parm_depth
= TMPL_PARMS_DEPTH (parmlist
);
9002 arg_depth
= TMPL_ARGS_DEPTH (arglist
);
9004 if (arg_depth
== 1 && parm_depth
> 1)
9006 /* We've been given an incomplete set of template arguments.
9009 template <class T> struct S1 {
9010 template <class U> struct S2 {};
9011 template <class U> struct S2<U*> {};
9014 we will be called with an ARGLIST of `U*', but the
9015 TEMPLATE will be `template <class T> template
9016 <class U> struct S1<T>::S2'. We must fill in the missing
9018 tree ti
= TYPE_TEMPLATE_INFO_MAYBE_ALIAS (TREE_TYPE (templ
));
9019 arglist
= add_outermost_template_args (TI_ARGS (ti
), arglist
);
9020 arg_depth
= TMPL_ARGS_DEPTH (arglist
);
9023 /* Now we should have enough arguments. */
9024 gcc_assert (parm_depth
== arg_depth
);
9026 /* From here on, we're only interested in the most general
9029 /* Calculate the BOUND_ARGS. These will be the args that are
9030 actually tsubst'd into the definition to create the
9032 arglist
= coerce_innermost_template_parms (parmlist
, arglist
, gen_tmpl
,
9034 /*require_all_args=*/true,
9035 /*use_default_args=*/true);
9037 if (arglist
== error_mark_node
)
9038 /* We were unable to bind the arguments. */
9039 return error_mark_node
;
9041 /* In the scope of a template class, explicit references to the
9042 template class refer to the type of the template, not any
9043 instantiation of it. For example, in:
9045 template <class T> class C { void f(C<T>); }
9047 the `C<T>' is just the same as `C'. Outside of the
9048 class, however, such a reference is an instantiation. */
9050 || !PRIMARY_TEMPLATE_P (gen_tmpl
)
9051 || currently_open_class (template_type
))
9053 tree tinfo
= TYPE_TEMPLATE_INFO (template_type
);
9055 if (tinfo
&& comp_template_args (TI_ARGS (tinfo
), arglist
))
9056 return template_type
;
9059 /* If we already have this specialization, return it. */
9060 elt
.tmpl
= gen_tmpl
;
9062 elt
.spec
= NULL_TREE
;
9063 hash
= spec_hasher::hash (&elt
);
9064 entry
= type_specializations
->find_with_hash (&elt
, hash
);
9069 /* If the the template's constraints are not satisfied,
9070 then we cannot form a valid type.
9072 Note that the check is deferred until after the hash
9073 lookup. This prevents redundant checks on previously
9074 instantiated specializations. */
9075 if (flag_concepts
&& !constraints_satisfied_p (gen_tmpl
, arglist
))
9077 if (complain
& tf_error
)
9079 error ("template constraint failure");
9080 diagnose_constraints (input_location
, gen_tmpl
, arglist
);
9082 return error_mark_node
;
9085 is_dependent_type
= uses_template_parms (arglist
);
9087 /* If the deduced arguments are invalid, then the binding
9089 if (!is_dependent_type
9090 && check_instantiated_args (gen_tmpl
,
9091 INNERMOST_TEMPLATE_ARGS (arglist
),
9093 return error_mark_node
;
9095 if (!is_dependent_type
9096 && !PRIMARY_TEMPLATE_P (gen_tmpl
)
9097 && !LAMBDA_TYPE_P (TREE_TYPE (gen_tmpl
))
9098 && TREE_CODE (CP_DECL_CONTEXT (gen_tmpl
)) == NAMESPACE_DECL
)
9100 found
= xref_tag_from_type (TREE_TYPE (gen_tmpl
),
9101 DECL_NAME (gen_tmpl
),
9102 /*tag_scope=*/ts_global
);
9106 context
= tsubst (DECL_CONTEXT (gen_tmpl
), arglist
,
9108 if (context
== error_mark_node
)
9109 return error_mark_node
;
9112 context
= global_namespace
;
9114 /* Create the type. */
9115 if (DECL_ALIAS_TEMPLATE_P (gen_tmpl
))
9117 /* The user referred to a specialization of an alias
9118 template represented by GEN_TMPL.
9120 [temp.alias]/2 says:
9122 When a template-id refers to the specialization of an
9123 alias template, it is equivalent to the associated
9124 type obtained by substitution of its
9125 template-arguments for the template-parameters in the
9126 type-id of the alias template. */
9128 t
= tsubst (TREE_TYPE (gen_tmpl
), arglist
, complain
, in_decl
);
9129 /* Note that the call above (by indirectly calling
9130 register_specialization in tsubst_decl) registers the
9131 TYPE_DECL representing the specialization of the alias
9132 template. So next time someone substitutes ARGLIST for
9133 the template parms into the alias template (GEN_TMPL),
9134 she'll get that TYPE_DECL back. */
9136 if (t
== error_mark_node
)
9139 else if (TREE_CODE (template_type
) == ENUMERAL_TYPE
)
9141 if (!is_dependent_type
)
9143 set_current_access_from_decl (TYPE_NAME (template_type
));
9144 t
= start_enum (TYPE_IDENTIFIER (template_type
), NULL_TREE
,
9145 tsubst (ENUM_UNDERLYING_TYPE (template_type
),
9146 arglist
, complain
, in_decl
),
9147 tsubst_attributes (TYPE_ATTRIBUTES (template_type
),
9148 arglist
, complain
, in_decl
),
9149 SCOPED_ENUM_P (template_type
), NULL
);
9151 if (t
== error_mark_node
)
9156 /* We don't want to call start_enum for this type, since
9157 the values for the enumeration constants may involve
9158 template parameters. And, no one should be interested
9159 in the enumeration constants for such a type. */
9160 t
= cxx_make_type (ENUMERAL_TYPE
);
9161 SET_SCOPED_ENUM_P (t
, SCOPED_ENUM_P (template_type
));
9163 SET_OPAQUE_ENUM_P (t
, OPAQUE_ENUM_P (template_type
));
9164 ENUM_FIXED_UNDERLYING_TYPE_P (t
)
9165 = ENUM_FIXED_UNDERLYING_TYPE_P (template_type
);
9167 else if (CLASS_TYPE_P (template_type
))
9169 /* Lambda closures are regenerated in tsubst_lambda_expr, not
9170 instantiated here. */
9171 gcc_assert (!LAMBDA_TYPE_P (template_type
));
9173 t
= make_class_type (TREE_CODE (template_type
));
9174 CLASSTYPE_DECLARED_CLASS (t
)
9175 = CLASSTYPE_DECLARED_CLASS (template_type
);
9176 SET_CLASSTYPE_IMPLICIT_INSTANTIATION (t
);
9178 /* A local class. Make sure the decl gets registered properly. */
9179 if (context
== current_function_decl
)
9180 pushtag (DECL_NAME (gen_tmpl
), t
, /*tag_scope=*/ts_current
);
9182 if (comp_template_args (CLASSTYPE_TI_ARGS (template_type
), arglist
))
9183 /* This instantiation is another name for the primary
9184 template type. Set the TYPE_CANONICAL field
9186 TYPE_CANONICAL (t
) = template_type
;
9187 else if (any_template_arguments_need_structural_equality_p (arglist
))
9188 /* Some of the template arguments require structural
9189 equality testing, so this template class requires
9190 structural equality testing. */
9191 SET_TYPE_STRUCTURAL_EQUALITY (t
);
9196 /* If we called start_enum or pushtag above, this information
9197 will already be set up. */
9200 TYPE_CONTEXT (t
) = FROB_CONTEXT (context
);
9202 type_decl
= create_implicit_typedef (DECL_NAME (gen_tmpl
), t
);
9203 DECL_CONTEXT (type_decl
) = TYPE_CONTEXT (t
);
9204 DECL_SOURCE_LOCATION (type_decl
)
9205 = DECL_SOURCE_LOCATION (TYPE_STUB_DECL (template_type
));
9208 type_decl
= TYPE_NAME (t
);
9210 if (CLASS_TYPE_P (template_type
))
9212 TREE_PRIVATE (type_decl
)
9213 = TREE_PRIVATE (TYPE_MAIN_DECL (template_type
));
9214 TREE_PROTECTED (type_decl
)
9215 = TREE_PROTECTED (TYPE_MAIN_DECL (template_type
));
9216 if (CLASSTYPE_VISIBILITY_SPECIFIED (template_type
))
9218 DECL_VISIBILITY_SPECIFIED (type_decl
) = 1;
9219 DECL_VISIBILITY (type_decl
) = CLASSTYPE_VISIBILITY (template_type
);
9223 if (OVERLOAD_TYPE_P (t
)
9224 && !DECL_ALIAS_TEMPLATE_P (gen_tmpl
))
9226 static const char *tags
[] = {"abi_tag", "may_alias"};
9228 for (unsigned ix
= 0; ix
!= 2; ix
++)
9231 = lookup_attribute (tags
[ix
], TYPE_ATTRIBUTES (template_type
));
9235 = tree_cons (TREE_PURPOSE (attributes
),
9236 TREE_VALUE (attributes
),
9237 TYPE_ATTRIBUTES (t
));
9241 /* Let's consider the explicit specialization of a member
9242 of a class template specialization that is implicitly instantiated,
9247 template<class U> struct M {}; //#0
9252 struct S<int>::M<char> //#1
9256 [temp.expl.spec]/4 says this is valid.
9258 In this case, when we write:
9261 M is instantiated from the CLASSTYPE_TI_TEMPLATE of #1, not from
9264 When we encounter #1, we want to store the partial instantiation
9265 of M (template<class T> S<int>::M<T>) in its CLASSTYPE_TI_TEMPLATE.
9267 For all cases other than this "explicit specialization of member of a
9268 class template", we just want to store the most general template into
9269 the CLASSTYPE_TI_TEMPLATE of M.
9271 This case of "explicit specialization of member of a class template"
9273 1/ the enclosing class is an instantiation of, and therefore not
9274 the same as, the context of the most general template, and
9275 2/ we aren't looking at the partial instantiation itself, i.e.
9276 the innermost arguments are not the same as the innermost parms of
9277 the most general template.
9279 So it's only when 1/ and 2/ happens that we want to use the partial
9280 instantiation of the member template in lieu of its most general
9283 if (PRIMARY_TEMPLATE_P (gen_tmpl
)
9284 && TMPL_ARGS_HAVE_MULTIPLE_LEVELS (arglist
)
9285 /* the enclosing class must be an instantiation... */
9286 && CLASS_TYPE_P (context
)
9287 && !same_type_p (context
, DECL_CONTEXT (gen_tmpl
)))
9289 TREE_VEC_LENGTH (arglist
)--;
9290 ++processing_template_decl
;
9291 tree tinfo
= TYPE_TEMPLATE_INFO_MAYBE_ALIAS (TREE_TYPE (gen_tmpl
));
9292 tree partial_inst_args
=
9293 tsubst (INNERMOST_TEMPLATE_ARGS (TI_ARGS (tinfo
)),
9294 arglist
, complain
, NULL_TREE
);
9295 --processing_template_decl
;
9296 TREE_VEC_LENGTH (arglist
)++;
9297 if (partial_inst_args
== error_mark_node
)
9298 return error_mark_node
;
9299 use_partial_inst_tmpl
=
9300 /*...and we must not be looking at the partial instantiation
9302 !comp_template_args (INNERMOST_TEMPLATE_ARGS (arglist
),
9306 if (!use_partial_inst_tmpl
)
9307 /* This case is easy; there are no member templates involved. */
9311 /* This is a full instantiation of a member template. Find
9312 the partial instantiation of which this is an instance. */
9314 /* Temporarily reduce by one the number of levels in the ARGLIST
9315 so as to avoid comparing the last set of arguments. */
9316 TREE_VEC_LENGTH (arglist
)--;
9317 found
= tsubst (gen_tmpl
, arglist
, complain
, NULL_TREE
);
9318 TREE_VEC_LENGTH (arglist
)++;
9319 /* FOUND is either a proper class type, or an alias
9320 template specialization. In the later case, it's a
9321 TYPE_DECL, resulting from the substituting of arguments
9322 for parameters in the TYPE_DECL of the alias template
9323 done earlier. So be careful while getting the template
9325 found
= (TREE_CODE (found
) == TEMPLATE_DECL
9327 : (TREE_CODE (found
) == TYPE_DECL
9328 ? DECL_TI_TEMPLATE (found
)
9329 : CLASSTYPE_TI_TEMPLATE (found
)));
9332 // Build template info for the new specialization.
9333 SET_TYPE_TEMPLATE_INFO (t
, build_template_info (found
, arglist
));
9336 slot
= type_specializations
->find_slot_with_hash (&elt
, hash
, INSERT
);
9337 entry
= ggc_alloc
<spec_entry
> ();
9341 /* Note this use of the partial instantiation so we can check it
9342 later in maybe_process_partial_specialization. */
9343 DECL_TEMPLATE_INSTANTIATIONS (found
)
9344 = tree_cons (arglist
, t
,
9345 DECL_TEMPLATE_INSTANTIATIONS (found
));
9347 if (TREE_CODE (template_type
) == ENUMERAL_TYPE
&& !is_dependent_type
9348 && !DECL_ALIAS_TEMPLATE_P (gen_tmpl
))
9349 /* Now that the type has been registered on the instantiations
9350 list, we set up the enumerators. Because the enumeration
9351 constants may involve the enumeration type itself, we make
9352 sure to register the type first, and then create the
9353 constants. That way, doing tsubst_expr for the enumeration
9354 constants won't result in recursive calls here; we'll find
9355 the instantiation and exit above. */
9356 tsubst_enum (template_type
, t
, arglist
);
9358 if (CLASS_TYPE_P (template_type
) && is_dependent_type
)
9359 /* If the type makes use of template parameters, the
9360 code that generates debugging information will crash. */
9361 DECL_IGNORED_P (TYPE_MAIN_DECL (t
)) = 1;
9363 /* Possibly limit visibility based on template args. */
9364 TREE_PUBLIC (type_decl
) = 1;
9365 determine_visibility (type_decl
);
9367 inherit_targ_abi_tags (t
);
9373 /* Wrapper for lookup_template_class_1. */
9376 lookup_template_class (tree d1
, tree arglist
, tree in_decl
, tree context
,
9377 int entering_scope
, tsubst_flags_t complain
)
9380 timevar_push (TV_TEMPLATE_INST
);
9381 ret
= lookup_template_class_1 (d1
, arglist
, in_decl
, context
,
9382 entering_scope
, complain
);
9383 timevar_pop (TV_TEMPLATE_INST
);
9387 /* Return a TEMPLATE_ID_EXPR for the given variable template and ARGLIST. */
9390 lookup_template_variable (tree templ
, tree arglist
)
9392 /* The type of the expression is NULL_TREE since the template-id could refer
9393 to an explicit or partial specialization. */
9394 tree type
= NULL_TREE
;
9395 if (flag_concepts
&& variable_concept_p (templ
))
9396 /* Except that concepts are always bool. */
9397 type
= boolean_type_node
;
9398 return build2 (TEMPLATE_ID_EXPR
, type
, templ
, arglist
);
9401 /* Instantiate a variable declaration from a TEMPLATE_ID_EXPR for use. */
9404 finish_template_variable (tree var
, tsubst_flags_t complain
)
9406 tree templ
= TREE_OPERAND (var
, 0);
9407 tree arglist
= TREE_OPERAND (var
, 1);
9409 /* We never want to return a VAR_DECL for a variable concept, since they
9410 aren't instantiated. In a template, leave the TEMPLATE_ID_EXPR alone. */
9411 bool concept_p
= flag_concepts
&& variable_concept_p (templ
);
9412 if (concept_p
&& processing_template_decl
)
9415 tree tmpl_args
= DECL_TI_ARGS (DECL_TEMPLATE_RESULT (templ
));
9416 arglist
= add_outermost_template_args (tmpl_args
, arglist
);
9418 templ
= most_general_template (templ
);
9419 tree parms
= DECL_TEMPLATE_PARMS (templ
);
9420 arglist
= coerce_innermost_template_parms (parms
, arglist
, templ
, complain
,
9422 /*use_default*/true);
9424 if (flag_concepts
&& !constraints_satisfied_p (templ
, arglist
))
9426 if (complain
& tf_error
)
9428 error ("use of invalid variable template %qE", var
);
9429 diagnose_constraints (location_of (var
), templ
, arglist
);
9431 return error_mark_node
;
9434 /* If a template-id refers to a specialization of a variable
9435 concept, then the expression is true if and only if the
9436 concept's constraints are satisfied by the given template
9439 NOTE: This is an extension of Concepts Lite TS that
9440 allows constraints to be used in expressions. */
9443 tree decl
= DECL_TEMPLATE_RESULT (templ
);
9444 return evaluate_variable_concept (decl
, arglist
);
9447 return instantiate_template (templ
, arglist
, complain
);
9450 /* Construct a TEMPLATE_ID_EXPR for the given variable template TEMPL having
9451 TARGS template args, and instantiate it if it's not dependent. */
9454 lookup_and_finish_template_variable (tree templ
, tree targs
,
9455 tsubst_flags_t complain
)
9457 templ
= lookup_template_variable (templ
, targs
);
9458 if (!any_dependent_template_arguments_p (targs
))
9460 templ
= finish_template_variable (templ
, complain
);
9464 return convert_from_reference (templ
);
9473 /* True when we should also visit template parameters that occur in
9474 non-deduced contexts. */
9475 bool include_nondeduced_p
;
9476 hash_set
<tree
> *visited
;
9479 /* Called from for_each_template_parm via walk_tree. */
9482 for_each_template_parm_r (tree
*tp
, int *walk_subtrees
, void *d
)
9485 struct pair_fn_data
*pfd
= (struct pair_fn_data
*) d
;
9486 tree_fn_t fn
= pfd
->fn
;
9487 void *data
= pfd
->data
;
9488 tree result
= NULL_TREE
;
9490 #define WALK_SUBTREE(NODE) \
9493 result = for_each_template_parm (NODE, fn, data, pfd->visited, \
9494 pfd->include_nondeduced_p, \
9496 if (result) goto out; \
9500 if (pfd
->any_fn
&& (*pfd
->any_fn
)(t
, data
))
9504 && (pfd
->include_nondeduced_p
|| TREE_CODE (t
) != TYPENAME_TYPE
))
9505 WALK_SUBTREE (TYPE_CONTEXT (t
));
9507 switch (TREE_CODE (t
))
9510 if (TYPE_PTRMEMFUNC_P (t
))
9516 if (!TYPE_TEMPLATE_INFO (t
))
9519 WALK_SUBTREE (TYPE_TI_ARGS (t
));
9523 WALK_SUBTREE (TYPE_MIN_VALUE (t
));
9524 WALK_SUBTREE (TYPE_MAX_VALUE (t
));
9528 /* Since we're not going to walk subtrees, we have to do this
9530 WALK_SUBTREE (TYPE_METHOD_BASETYPE (t
));
9534 /* Check the return type. */
9535 WALK_SUBTREE (TREE_TYPE (t
));
9537 /* Check the parameter types. Since default arguments are not
9538 instantiated until they are needed, the TYPE_ARG_TYPES may
9539 contain expressions that involve template parameters. But,
9540 no-one should be looking at them yet. And, once they're
9541 instantiated, they don't contain template parameters, so
9542 there's no point in looking at them then, either. */
9546 for (parm
= TYPE_ARG_TYPES (t
); parm
; parm
= TREE_CHAIN (parm
))
9547 WALK_SUBTREE (TREE_VALUE (parm
));
9549 /* Since we've already handled the TYPE_ARG_TYPES, we don't
9550 want walk_tree walking into them itself. */
9554 if (flag_noexcept_type
)
9556 tree spec
= TYPE_RAISES_EXCEPTIONS (t
);
9558 WALK_SUBTREE (TREE_PURPOSE (spec
));
9563 case UNDERLYING_TYPE
:
9564 if (pfd
->include_nondeduced_p
9565 && for_each_template_parm (TYPE_VALUES_RAW (t
), fn
, data
,
9567 pfd
->include_nondeduced_p
,
9569 return error_mark_node
;
9574 if (DECL_LANG_SPECIFIC (t
) && DECL_TEMPLATE_INFO (t
))
9575 WALK_SUBTREE (DECL_TI_ARGS (t
));
9580 if (TREE_CODE (t
) == CONST_DECL
&& DECL_TEMPLATE_PARM_P (t
))
9581 WALK_SUBTREE (DECL_INITIAL (t
));
9582 if (DECL_CONTEXT (t
)
9583 && pfd
->include_nondeduced_p
)
9584 WALK_SUBTREE (DECL_CONTEXT (t
));
9587 case BOUND_TEMPLATE_TEMPLATE_PARM
:
9588 /* Record template parameters such as `T' inside `TT<T>'. */
9589 WALK_SUBTREE (TYPE_TI_ARGS (t
));
9592 case TEMPLATE_TEMPLATE_PARM
:
9593 case TEMPLATE_TYPE_PARM
:
9594 case TEMPLATE_PARM_INDEX
:
9595 if (fn
&& (*fn
)(t
, data
))
9602 /* A template template parameter is encountered. */
9603 if (DECL_TEMPLATE_TEMPLATE_PARM_P (t
))
9604 WALK_SUBTREE (TREE_TYPE (t
));
9606 /* Already substituted template template parameter */
9611 /* A template-id in a TYPENAME_TYPE might be a deduced context after
9612 partial instantiation. */
9613 WALK_SUBTREE (TYPENAME_TYPE_FULLNAME (t
));
9617 if (TREE_TYPE (t
) && TYPE_PTRMEMFUNC_P (TREE_TYPE (t
))
9618 && pfd
->include_nondeduced_p
)
9619 WALK_SUBTREE (TYPE_PTRMEMFUNC_FN_TYPE (TREE_TYPE (t
)));
9624 /* If there's no type, then this thing must be some expression
9625 involving template parameters. */
9626 if (!fn
&& !TREE_TYPE (t
))
9627 return error_mark_node
;
9632 case IMPLICIT_CONV_EXPR
:
9633 case REINTERPRET_CAST_EXPR
:
9634 case CONST_CAST_EXPR
:
9635 case STATIC_CAST_EXPR
:
9636 case DYNAMIC_CAST_EXPR
:
9640 case PSEUDO_DTOR_EXPR
:
9642 return error_mark_node
;
9651 /* We didn't find any template parameters we liked. */
9656 /* For each TEMPLATE_TYPE_PARM, TEMPLATE_TEMPLATE_PARM,
9657 BOUND_TEMPLATE_TEMPLATE_PARM or TEMPLATE_PARM_INDEX in T,
9658 call FN with the parameter and the DATA.
9659 If FN returns nonzero, the iteration is terminated, and
9660 for_each_template_parm returns 1. Otherwise, the iteration
9661 continues. If FN never returns a nonzero value, the value
9662 returned by for_each_template_parm is 0. If FN is NULL, it is
9663 considered to be the function which always returns 1.
9665 If INCLUDE_NONDEDUCED_P, then this routine will also visit template
9666 parameters that occur in non-deduced contexts. When false, only
9667 visits those template parameters that can be deduced. */
9670 for_each_template_parm (tree t
, tree_fn_t fn
, void* data
,
9671 hash_set
<tree
> *visited
,
9672 bool include_nondeduced_p
,
9675 struct pair_fn_data pfd
;
9680 pfd
.any_fn
= any_fn
;
9682 pfd
.include_nondeduced_p
= include_nondeduced_p
;
9684 /* Walk the tree. (Conceptually, we would like to walk without
9685 duplicates, but for_each_template_parm_r recursively calls
9686 for_each_template_parm, so we would need to reorganize a fair
9687 bit to use walk_tree_without_duplicates, so we keep our own
9690 pfd
.visited
= visited
;
9692 pfd
.visited
= new hash_set
<tree
>;
9693 result
= cp_walk_tree (&t
,
9694 for_each_template_parm_r
,
9708 /* Returns true if T depends on any template parameter. */
9711 uses_template_parms (tree t
)
9717 int saved_processing_template_decl
;
9719 saved_processing_template_decl
= processing_template_decl
;
9720 if (!saved_processing_template_decl
)
9721 processing_template_decl
= 1;
9723 dependent_p
= dependent_type_p (t
);
9724 else if (TREE_CODE (t
) == TREE_VEC
)
9725 dependent_p
= any_dependent_template_arguments_p (t
);
9726 else if (TREE_CODE (t
) == TREE_LIST
)
9727 dependent_p
= (uses_template_parms (TREE_VALUE (t
))
9728 || uses_template_parms (TREE_CHAIN (t
)));
9729 else if (TREE_CODE (t
) == TYPE_DECL
)
9730 dependent_p
= dependent_type_p (TREE_TYPE (t
));
9733 || TREE_CODE (t
) == TEMPLATE_PARM_INDEX
9734 || TREE_CODE (t
) == OVERLOAD
9737 || TREE_CODE (t
) == TRAIT_EXPR
9738 || TREE_CODE (t
) == CONSTRUCTOR
9739 || CONSTANT_CLASS_P (t
))
9740 dependent_p
= (type_dependent_expression_p (t
)
9741 || value_dependent_expression_p (t
));
9744 gcc_assert (t
== error_mark_node
);
9745 dependent_p
= false;
9748 processing_template_decl
= saved_processing_template_decl
;
9753 /* Returns true iff current_function_decl is an incompletely instantiated
9754 template. Useful instead of processing_template_decl because the latter
9755 is set to 0 during instantiate_non_dependent_expr. */
9758 in_template_function (void)
9760 tree fn
= current_function_decl
;
9762 ++processing_template_decl
;
9763 ret
= (fn
&& DECL_LANG_SPECIFIC (fn
)
9764 && DECL_TEMPLATE_INFO (fn
)
9765 && any_dependent_template_arguments_p (DECL_TI_ARGS (fn
)));
9766 --processing_template_decl
;
9770 /* Returns true if T depends on any template parameter with level LEVEL. */
9773 uses_template_parms_level (tree t
, int level
)
9775 return for_each_template_parm (t
, template_parm_this_level_p
, &level
, NULL
,
9776 /*include_nondeduced_p=*/true);
9779 /* Returns true if the signature of DECL depends on any template parameter from
9780 its enclosing class. */
9783 uses_outer_template_parms (tree decl
)
9785 int depth
= template_class_depth (CP_DECL_CONTEXT (decl
));
9788 if (for_each_template_parm (TREE_TYPE (decl
), template_parm_outer_level
,
9789 &depth
, NULL
, /*include_nondeduced_p=*/true))
9791 if (PRIMARY_TEMPLATE_P (decl
)
9792 && for_each_template_parm (INNERMOST_TEMPLATE_PARMS
9793 (DECL_TEMPLATE_PARMS (decl
)),
9794 template_parm_outer_level
,
9795 &depth
, NULL
, /*include_nondeduced_p=*/true))
9797 tree ci
= get_constraints (decl
);
9799 ci
= CI_ASSOCIATED_CONSTRAINTS (ci
);
9800 if (ci
&& for_each_template_parm (ci
, template_parm_outer_level
,
9801 &depth
, NULL
, /*nondeduced*/true))
9806 /* Returns TRUE iff INST is an instantiation we don't need to do in an
9807 ill-formed translation unit, i.e. a variable or function that isn't
9808 usable in a constant expression. */
9811 neglectable_inst_p (tree d
)
9814 && !undeduced_auto_decl (d
)
9815 && !(TREE_CODE (d
) == FUNCTION_DECL
? DECL_DECLARED_CONSTEXPR_P (d
)
9816 : decl_maybe_constant_var_p (d
)));
9819 /* Returns TRUE iff we should refuse to instantiate DECL because it's
9820 neglectable and instantiated from within an erroneous instantiation. */
9823 limit_bad_template_recursion (tree decl
)
9825 struct tinst_level
*lev
= current_tinst_level
;
9826 int errs
= errorcount
+ sorrycount
;
9827 if (lev
== NULL
|| errs
== 0 || !neglectable_inst_p (decl
))
9830 for (; lev
; lev
= lev
->next
)
9831 if (neglectable_inst_p (lev
->decl
))
9834 return (lev
&& errs
> lev
->errors
);
9837 static int tinst_depth
;
9838 extern int max_tinst_depth
;
9841 static GTY(()) struct tinst_level
*last_error_tinst_level
;
9843 /* We're starting to instantiate D; record the template instantiation context
9844 for diagnostics and to restore it later. */
9847 push_tinst_level (tree d
)
9849 return push_tinst_level_loc (d
, input_location
);
9852 /* We're starting to instantiate D; record the template instantiation context
9853 at LOC for diagnostics and to restore it later. */
9856 push_tinst_level_loc (tree d
, location_t loc
)
9858 struct tinst_level
*new_level
;
9860 if (tinst_depth
>= max_tinst_depth
)
9862 /* Tell error.c not to try to instantiate any templates. */
9864 fatal_error (input_location
,
9865 "template instantiation depth exceeds maximum of %d"
9866 " (use -ftemplate-depth= to increase the maximum)",
9871 /* If the current instantiation caused problems, don't let it instantiate
9872 anything else. Do allow deduction substitution and decls usable in
9873 constant expressions. */
9874 if (limit_bad_template_recursion (d
))
9877 /* When not -quiet, dump template instantiations other than functions, since
9878 announce_function will take care of those. */
9880 && TREE_CODE (d
) != TREE_LIST
9881 && TREE_CODE (d
) != FUNCTION_DECL
)
9882 fprintf (stderr
, " %s", decl_as_string (d
, TFF_DECL_SPECIFIERS
));
9884 new_level
= ggc_alloc
<tinst_level
> ();
9885 new_level
->decl
= d
;
9886 new_level
->locus
= loc
;
9887 new_level
->errors
= errorcount
+sorrycount
;
9888 new_level
->in_system_header_p
= in_system_header_at (input_location
);
9889 new_level
->next
= current_tinst_level
;
9890 current_tinst_level
= new_level
;
9893 if (GATHER_STATISTICS
&& (tinst_depth
> depth_reached
))
9894 depth_reached
= tinst_depth
;
9899 /* We're done instantiating this template; return to the instantiation
9903 pop_tinst_level (void)
9905 /* Restore the filename and line number stashed away when we started
9906 this instantiation. */
9907 input_location
= current_tinst_level
->locus
;
9908 current_tinst_level
= current_tinst_level
->next
;
9912 /* We're instantiating a deferred template; restore the template
9913 instantiation context in which the instantiation was requested, which
9914 is one step out from LEVEL. Return the corresponding DECL or TYPE. */
9917 reopen_tinst_level (struct tinst_level
*level
)
9919 struct tinst_level
*t
;
9922 for (t
= level
; t
; t
= t
->next
)
9925 current_tinst_level
= level
;
9927 if (current_tinst_level
)
9928 current_tinst_level
->errors
= errorcount
+sorrycount
;
9932 /* Returns the TINST_LEVEL which gives the original instantiation
9935 struct tinst_level
*
9936 outermost_tinst_level (void)
9938 struct tinst_level
*level
= current_tinst_level
;
9941 level
= level
->next
;
9945 /* DECL is a friend FUNCTION_DECL or TEMPLATE_DECL. ARGS is the
9946 vector of template arguments, as for tsubst.
9948 Returns an appropriate tsubst'd friend declaration. */
9951 tsubst_friend_function (tree decl
, tree args
)
9955 if (TREE_CODE (decl
) == FUNCTION_DECL
9956 && DECL_TEMPLATE_INSTANTIATION (decl
)
9957 && TREE_CODE (DECL_TI_TEMPLATE (decl
)) != TEMPLATE_DECL
)
9958 /* This was a friend declared with an explicit template
9959 argument list, e.g.:
9963 to indicate that f was a template instantiation, not a new
9964 function declaration. Now, we have to figure out what
9965 instantiation of what template. */
9967 tree template_id
, arglist
, fns
;
9970 tree ns
= decl_namespace_context (TYPE_MAIN_DECL (current_class_type
));
9972 /* Friend functions are looked up in the containing namespace scope.
9973 We must enter that scope, to avoid finding member functions of the
9974 current class with same name. */
9975 push_nested_namespace (ns
);
9976 fns
= tsubst_expr (DECL_TI_TEMPLATE (decl
), args
,
9977 tf_warning_or_error
, NULL_TREE
,
9978 /*integral_constant_expression_p=*/false);
9979 pop_nested_namespace (ns
);
9980 arglist
= tsubst (DECL_TI_ARGS (decl
), args
,
9981 tf_warning_or_error
, NULL_TREE
);
9982 template_id
= lookup_template_function (fns
, arglist
);
9984 new_friend
= tsubst (decl
, args
, tf_warning_or_error
, NULL_TREE
);
9985 tmpl
= determine_specialization (template_id
, new_friend
,
9987 /*need_member_template=*/0,
9988 TREE_VEC_LENGTH (args
),
9990 return instantiate_template (tmpl
, new_args
, tf_error
);
9993 new_friend
= tsubst (decl
, args
, tf_warning_or_error
, NULL_TREE
);
9995 /* The NEW_FRIEND will look like an instantiation, to the
9996 compiler, but is not an instantiation from the point of view of
9997 the language. For example, we might have had:
9999 template <class T> struct S {
10000 template <class U> friend void f(T, U);
10003 Then, in S<int>, template <class U> void f(int, U) is not an
10004 instantiation of anything. */
10005 if (new_friend
== error_mark_node
)
10006 return error_mark_node
;
10008 DECL_USE_TEMPLATE (new_friend
) = 0;
10009 if (TREE_CODE (decl
) == TEMPLATE_DECL
)
10011 DECL_USE_TEMPLATE (DECL_TEMPLATE_RESULT (new_friend
)) = 0;
10012 DECL_SAVED_TREE (DECL_TEMPLATE_RESULT (new_friend
))
10013 = DECL_SAVED_TREE (DECL_TEMPLATE_RESULT (decl
));
10016 /* The mangled name for the NEW_FRIEND is incorrect. The function
10017 is not a template instantiation and should not be mangled like
10018 one. Therefore, we forget the mangling here; we'll recompute it
10019 later if we need it. */
10020 if (TREE_CODE (new_friend
) != TEMPLATE_DECL
)
10022 SET_DECL_RTL (new_friend
, NULL
);
10023 SET_DECL_ASSEMBLER_NAME (new_friend
, NULL_TREE
);
10026 if (DECL_NAMESPACE_SCOPE_P (new_friend
))
10029 tree new_friend_template_info
;
10030 tree new_friend_result_template_info
;
10032 int new_friend_is_defn
;
10034 /* We must save some information from NEW_FRIEND before calling
10035 duplicate decls since that function will free NEW_FRIEND if
10037 new_friend_template_info
= DECL_TEMPLATE_INFO (new_friend
);
10038 new_friend_is_defn
=
10039 (DECL_INITIAL (DECL_TEMPLATE_RESULT
10040 (template_for_substitution (new_friend
)))
10042 if (TREE_CODE (new_friend
) == TEMPLATE_DECL
)
10044 /* This declaration is a `primary' template. */
10045 DECL_PRIMARY_TEMPLATE (new_friend
) = new_friend
;
10047 new_friend_result_template_info
10048 = DECL_TEMPLATE_INFO (DECL_TEMPLATE_RESULT (new_friend
));
10051 new_friend_result_template_info
= NULL_TREE
;
10053 /* Inside pushdecl_namespace_level, we will push into the
10054 current namespace. However, the friend function should go
10055 into the namespace of the template. */
10056 ns
= decl_namespace_context (new_friend
);
10057 push_nested_namespace (ns
);
10058 old_decl
= pushdecl_namespace_level (new_friend
, /*is_friend=*/true);
10059 pop_nested_namespace (ns
);
10061 if (old_decl
== error_mark_node
)
10062 return error_mark_node
;
10064 if (old_decl
!= new_friend
)
10066 /* This new friend declaration matched an existing
10067 declaration. For example, given:
10069 template <class T> void f(T);
10070 template <class U> class C {
10071 template <class T> friend void f(T) {}
10074 the friend declaration actually provides the definition
10075 of `f', once C has been instantiated for some type. So,
10076 old_decl will be the out-of-class template declaration,
10077 while new_friend is the in-class definition.
10079 But, if `f' was called before this point, the
10080 instantiation of `f' will have DECL_TI_ARGS corresponding
10081 to `T' but not to `U', references to which might appear
10082 in the definition of `f'. Previously, the most general
10083 template for an instantiation of `f' was the out-of-class
10084 version; now it is the in-class version. Therefore, we
10085 run through all specialization of `f', adding to their
10086 DECL_TI_ARGS appropriately. In particular, they need a
10087 new set of outer arguments, corresponding to the
10088 arguments for this class instantiation.
10090 The same situation can arise with something like this:
10092 friend void f(int);
10093 template <class T> class C {
10094 friend void f(T) {}
10097 when `C<int>' is instantiated. Now, `f(int)' is defined
10100 if (!new_friend_is_defn
)
10101 /* On the other hand, if the in-class declaration does
10102 *not* provide a definition, then we don't want to alter
10103 existing definitions. We can just leave everything
10108 tree new_template
= TI_TEMPLATE (new_friend_template_info
);
10109 tree new_args
= TI_ARGS (new_friend_template_info
);
10111 /* Overwrite whatever template info was there before, if
10112 any, with the new template information pertaining to
10113 the declaration. */
10114 DECL_TEMPLATE_INFO (old_decl
) = new_friend_template_info
;
10116 if (TREE_CODE (old_decl
) != TEMPLATE_DECL
)
10118 /* We should have called reregister_specialization in
10119 duplicate_decls. */
10120 gcc_assert (retrieve_specialization (new_template
,
10124 /* Instantiate it if the global has already been used. */
10125 if (DECL_ODR_USED (old_decl
))
10126 instantiate_decl (old_decl
, /*defer_ok=*/true,
10127 /*expl_inst_class_mem_p=*/false);
10133 /* Indicate that the old function template is a partial
10135 DECL_TEMPLATE_INFO (DECL_TEMPLATE_RESULT (old_decl
))
10136 = new_friend_result_template_info
;
10138 gcc_assert (new_template
10139 == most_general_template (new_template
));
10140 gcc_assert (new_template
!= old_decl
);
10142 /* Reassign any specializations already in the hash table
10143 to the new more general template, and add the
10144 additional template args. */
10145 for (t
= DECL_TEMPLATE_INSTANTIATIONS (old_decl
);
10147 t
= TREE_CHAIN (t
))
10149 tree spec
= TREE_VALUE (t
);
10152 elt
.tmpl
= old_decl
;
10153 elt
.args
= DECL_TI_ARGS (spec
);
10154 elt
.spec
= NULL_TREE
;
10156 decl_specializations
->remove_elt (&elt
);
10158 DECL_TI_ARGS (spec
)
10159 = add_outermost_template_args (new_args
,
10160 DECL_TI_ARGS (spec
));
10162 register_specialization
10163 (spec
, new_template
, DECL_TI_ARGS (spec
), true, 0);
10166 DECL_TEMPLATE_INSTANTIATIONS (old_decl
) = NULL_TREE
;
10170 /* The information from NEW_FRIEND has been merged into OLD_DECL
10171 by duplicate_decls. */
10172 new_friend
= old_decl
;
10177 tree context
= DECL_CONTEXT (new_friend
);
10181 template <class T> class C {
10182 template <class U> friend void C1<U>::f (); // case 1
10183 friend void C2<T>::f (); // case 2
10185 we only need to make sure CONTEXT is a complete type for
10186 case 2. To distinguish between the two cases, we note that
10187 CONTEXT of case 1 remains dependent type after tsubst while
10188 this isn't true for case 2. */
10189 ++processing_template_decl
;
10190 dependent_p
= dependent_type_p (context
);
10191 --processing_template_decl
;
10194 && !complete_type_or_else (context
, NULL_TREE
))
10195 return error_mark_node
;
10197 if (COMPLETE_TYPE_P (context
))
10199 tree fn
= new_friend
;
10200 /* do_friend adds the TEMPLATE_DECL for any member friend
10201 template even if it isn't a member template, i.e.
10202 template <class T> friend A<T>::f();
10203 Look through it in that case. */
10204 if (TREE_CODE (fn
) == TEMPLATE_DECL
10205 && !PRIMARY_TEMPLATE_P (fn
))
10206 fn
= DECL_TEMPLATE_RESULT (fn
);
10207 /* Check to see that the declaration is really present, and,
10208 possibly obtain an improved declaration. */
10209 fn
= check_classfn (context
, fn
, NULL_TREE
);
10219 /* FRIEND_TMPL is a friend TEMPLATE_DECL. ARGS is the vector of
10220 template arguments, as for tsubst.
10222 Returns an appropriate tsubst'd friend type or error_mark_node on
10226 tsubst_friend_class (tree friend_tmpl
, tree args
)
10230 if (DECL_TEMPLATE_TEMPLATE_PARM_P (friend_tmpl
))
10232 tmpl
= tsubst (TREE_TYPE (friend_tmpl
), args
, tf_none
, NULL_TREE
);
10233 return TREE_TYPE (tmpl
);
10236 tree context
= CP_DECL_CONTEXT (friend_tmpl
);
10237 if (TREE_CODE (context
) == NAMESPACE_DECL
)
10238 push_nested_namespace (context
);
10240 push_nested_class (context
);
10242 tmpl
= lookup_name_real (DECL_NAME (friend_tmpl
), /*prefer_type=*/false,
10243 /*non_class=*/false, /*block_p=*/false,
10244 /*namespaces_only=*/false, LOOKUP_HIDDEN
);
10246 if (tmpl
&& DECL_CLASS_TEMPLATE_P (tmpl
))
10248 /* The friend template has already been declared. Just
10249 check to see that the declarations match, and install any new
10250 default parameters. We must tsubst the default parameters,
10251 of course. We only need the innermost template parameters
10252 because that is all that redeclare_class_template will look
10254 if (TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (friend_tmpl
))
10255 > TMPL_ARGS_DEPTH (args
))
10257 tree parms
= tsubst_template_parms (DECL_TEMPLATE_PARMS (friend_tmpl
),
10258 args
, tf_warning_or_error
);
10259 location_t saved_input_location
= input_location
;
10260 input_location
= DECL_SOURCE_LOCATION (friend_tmpl
);
10261 tree cons
= get_constraints (tmpl
);
10262 redeclare_class_template (TREE_TYPE (tmpl
), parms
, cons
);
10263 input_location
= saved_input_location
;
10268 /* The friend template has not already been declared. In this
10269 case, the instantiation of the template class will cause the
10270 injection of this template into the namespace scope. */
10271 tmpl
= tsubst (friend_tmpl
, args
, tf_warning_or_error
, NULL_TREE
);
10273 if (tmpl
!= error_mark_node
)
10275 /* The new TMPL is not an instantiation of anything, so we
10276 forget its origins. We don't reset CLASSTYPE_TI_TEMPLATE
10277 for the new type because that is supposed to be the
10278 corresponding template decl, i.e., TMPL. */
10279 DECL_USE_TEMPLATE (tmpl
) = 0;
10280 DECL_TEMPLATE_INFO (tmpl
) = NULL_TREE
;
10281 CLASSTYPE_USE_TEMPLATE (TREE_TYPE (tmpl
)) = 0;
10282 CLASSTYPE_TI_ARGS (TREE_TYPE (tmpl
))
10283 = INNERMOST_TEMPLATE_ARGS (CLASSTYPE_TI_ARGS (TREE_TYPE (tmpl
)));
10285 /* It is hidden. */
10286 retrofit_lang_decl (DECL_TEMPLATE_RESULT (tmpl
));
10287 DECL_ANTICIPATED (tmpl
)
10288 = DECL_ANTICIPATED (DECL_TEMPLATE_RESULT (tmpl
)) = true;
10290 /* Inject this template into the enclosing namspace scope. */
10291 tmpl
= pushdecl_namespace_level (tmpl
, true);
10295 if (TREE_CODE (context
) == NAMESPACE_DECL
)
10296 pop_nested_namespace (context
);
10298 pop_nested_class ();
10300 return TREE_TYPE (tmpl
);
10303 /* Returns zero if TYPE cannot be completed later due to circularity.
10304 Otherwise returns one. */
10307 can_complete_type_without_circularity (tree type
)
10309 if (type
== NULL_TREE
|| type
== error_mark_node
)
10311 else if (COMPLETE_TYPE_P (type
))
10313 else if (TREE_CODE (type
) == ARRAY_TYPE
)
10314 return can_complete_type_without_circularity (TREE_TYPE (type
));
10315 else if (CLASS_TYPE_P (type
)
10316 && TYPE_BEING_DEFINED (TYPE_MAIN_VARIANT (type
)))
10322 static tree
tsubst_omp_clauses (tree
, enum c_omp_region_type
, tree
,
10323 tsubst_flags_t
, tree
);
10325 /* Instantiate a single dependent attribute T (a TREE_LIST), and return either
10326 T or a new TREE_LIST, possibly a chain in the case of a pack expansion. */
10329 tsubst_attribute (tree t
, tree
*decl_p
, tree args
,
10330 tsubst_flags_t complain
, tree in_decl
)
10332 gcc_assert (ATTR_IS_DEPENDENT (t
));
10334 tree val
= TREE_VALUE (t
);
10335 if (val
== NULL_TREE
)
10336 /* Nothing to do. */;
10337 else if ((flag_openmp
|| flag_openmp_simd
)
10338 && is_attribute_p ("omp declare simd",
10339 get_attribute_name (t
)))
10341 tree clauses
= TREE_VALUE (val
);
10342 clauses
= tsubst_omp_clauses (clauses
, C_ORT_OMP_DECLARE_SIMD
, args
,
10343 complain
, in_decl
);
10344 c_omp_declare_simd_clauses_to_decls (*decl_p
, clauses
);
10345 clauses
= finish_omp_clauses (clauses
, C_ORT_OMP_DECLARE_SIMD
);
10346 tree parms
= DECL_ARGUMENTS (*decl_p
);
10348 = c_omp_declare_simd_clauses_to_numbers (parms
, clauses
);
10350 val
= build_tree_list (NULL_TREE
, clauses
);
10354 /* If the first attribute argument is an identifier, don't
10355 pass it through tsubst. Attributes like mode, format,
10356 cleanup and several target specific attributes expect it
10358 else if (attribute_takes_identifier_p (get_attribute_name (t
)))
10361 = tsubst_expr (TREE_CHAIN (val
), args
, complain
, in_decl
,
10362 /*integral_constant_expression_p=*/false);
10363 if (chain
!= TREE_CHAIN (val
))
10364 val
= tree_cons (NULL_TREE
, TREE_VALUE (val
), chain
);
10366 else if (PACK_EXPANSION_P (val
))
10368 /* An attribute pack expansion. */
10369 tree purp
= TREE_PURPOSE (t
);
10370 tree pack
= tsubst_pack_expansion (val
, args
, complain
, in_decl
);
10371 if (pack
== error_mark_node
)
10372 return error_mark_node
;
10373 int len
= TREE_VEC_LENGTH (pack
);
10374 tree list
= NULL_TREE
;
10376 for (int i
= 0; i
< len
; ++i
)
10378 tree elt
= TREE_VEC_ELT (pack
, i
);
10379 *q
= build_tree_list (purp
, elt
);
10380 q
= &TREE_CHAIN (*q
);
10385 val
= tsubst_expr (val
, args
, complain
, in_decl
,
10386 /*integral_constant_expression_p=*/false);
10388 if (val
!= TREE_VALUE (t
))
10389 return build_tree_list (TREE_PURPOSE (t
), val
);
10393 /* Instantiate any dependent attributes in ATTRIBUTES, returning either it
10394 unchanged or a new TREE_LIST chain. */
10397 tsubst_attributes (tree attributes
, tree args
,
10398 tsubst_flags_t complain
, tree in_decl
)
10400 tree last_dep
= NULL_TREE
;
10402 for (tree t
= attributes
; t
; t
= TREE_CHAIN (t
))
10403 if (ATTR_IS_DEPENDENT (t
))
10406 attributes
= copy_list (attributes
);
10411 for (tree
*p
= &attributes
; *p
; )
10414 if (ATTR_IS_DEPENDENT (t
))
10416 tree subst
= tsubst_attribute (t
, NULL
, args
, complain
, in_decl
);
10421 p
= &TREE_CHAIN (*p
);
10422 *p
= TREE_CHAIN (t
);
10426 p
= &TREE_CHAIN (*p
);
10432 /* Apply any attributes which had to be deferred until instantiation
10433 time. DECL_P, ATTRIBUTES and ATTR_FLAGS are as cplus_decl_attributes;
10434 ARGS, COMPLAIN, IN_DECL are as tsubst. */
10437 apply_late_template_attributes (tree
*decl_p
, tree attributes
, int attr_flags
,
10438 tree args
, tsubst_flags_t complain
, tree in_decl
)
10440 tree last_dep
= NULL_TREE
;
10444 if (attributes
== NULL_TREE
)
10447 if (DECL_P (*decl_p
))
10449 if (TREE_TYPE (*decl_p
) == error_mark_node
)
10451 p
= &DECL_ATTRIBUTES (*decl_p
);
10452 /* DECL_ATTRIBUTES comes from copy_node in tsubst_decl, and is identical
10453 to our attributes parameter. */
10454 gcc_assert (*p
== attributes
);
10458 p
= &TYPE_ATTRIBUTES (*decl_p
);
10459 /* TYPE_ATTRIBUTES was set up (with abi_tag and may_alias) in
10460 lookup_template_class_1, and should be preserved. */
10461 gcc_assert (*p
!= attributes
);
10463 p
= &TREE_CHAIN (*p
);
10466 for (t
= attributes
; t
; t
= TREE_CHAIN (t
))
10467 if (ATTR_IS_DEPENDENT (t
))
10470 attributes
= copy_list (attributes
);
10477 tree late_attrs
= NULL_TREE
;
10478 tree
*q
= &late_attrs
;
10483 if (ATTR_IS_DEPENDENT (t
))
10485 *p
= TREE_CHAIN (t
);
10486 TREE_CHAIN (t
) = NULL_TREE
;
10487 *q
= tsubst_attribute (t
, decl_p
, args
, complain
, in_decl
);
10489 q
= &TREE_CHAIN (*q
);
10492 p
= &TREE_CHAIN (t
);
10495 cplus_decl_attributes (decl_p
, late_attrs
, attr_flags
);
10499 /* Perform (or defer) access check for typedefs that were referenced
10500 from within the template TMPL code.
10501 This is a subroutine of instantiate_decl and instantiate_class_template.
10502 TMPL is the template to consider and TARGS is the list of arguments of
10506 perform_typedefs_access_check (tree tmpl
, tree targs
)
10508 location_t saved_location
;
10510 qualified_typedef_usage_t
*iter
;
10513 || (!CLASS_TYPE_P (tmpl
)
10514 && TREE_CODE (tmpl
) != FUNCTION_DECL
))
10517 saved_location
= input_location
;
10518 FOR_EACH_VEC_SAFE_ELT (get_types_needing_access_check (tmpl
), i
, iter
)
10520 tree type_decl
= iter
->typedef_decl
;
10521 tree type_scope
= iter
->context
;
10523 if (!type_decl
|| !type_scope
|| !CLASS_TYPE_P (type_scope
))
10526 if (uses_template_parms (type_decl
))
10527 type_decl
= tsubst (type_decl
, targs
, tf_error
, NULL_TREE
);
10528 if (uses_template_parms (type_scope
))
10529 type_scope
= tsubst (type_scope
, targs
, tf_error
, NULL_TREE
);
10531 /* Make access check error messages point to the location
10532 of the use of the typedef. */
10533 input_location
= iter
->locus
;
10534 perform_or_defer_access_check (TYPE_BINFO (type_scope
),
10535 type_decl
, type_decl
,
10536 tf_warning_or_error
);
10538 input_location
= saved_location
;
10542 instantiate_class_template_1 (tree type
)
10544 tree templ
, args
, pattern
, t
, member
;
10548 unsigned int saved_maximum_field_alignment
;
10551 if (type
== error_mark_node
)
10552 return error_mark_node
;
10554 if (COMPLETE_OR_OPEN_TYPE_P (type
)
10555 || uses_template_parms (type
))
10558 /* Figure out which template is being instantiated. */
10559 templ
= most_general_template (CLASSTYPE_TI_TEMPLATE (type
));
10560 gcc_assert (TREE_CODE (templ
) == TEMPLATE_DECL
);
10562 /* Mark the type as in the process of being defined. */
10563 TYPE_BEING_DEFINED (type
) = 1;
10565 /* Determine what specialization of the original template to
10567 t
= most_specialized_partial_spec (type
, tf_warning_or_error
);
10568 if (t
== error_mark_node
)
10569 return error_mark_node
;
10572 /* This TYPE is actually an instantiation of a partial
10573 specialization. We replace the innermost set of ARGS with
10574 the arguments appropriate for substitution. For example,
10577 template <class T> struct S {};
10578 template <class T> struct S<T*> {};
10580 and supposing that we are instantiating S<int*>, ARGS will
10581 presently be {int*} -- but we need {int}. */
10582 pattern
= TREE_TYPE (t
);
10583 args
= TREE_PURPOSE (t
);
10587 pattern
= TREE_TYPE (templ
);
10588 args
= CLASSTYPE_TI_ARGS (type
);
10591 /* If the template we're instantiating is incomplete, then clearly
10592 there's nothing we can do. */
10593 if (!COMPLETE_TYPE_P (pattern
))
10595 /* We can try again later. */
10596 TYPE_BEING_DEFINED (type
) = 0;
10600 /* If we've recursively instantiated too many templates, stop. */
10601 if (! push_tinst_level (type
))
10604 /* We may be in the middle of deferred access check. Disable
10606 push_deferring_access_checks (dk_no_deferred
);
10608 int saved_unevaluated_operand
= cp_unevaluated_operand
;
10609 int saved_inhibit_evaluation_warnings
= c_inhibit_evaluation_warnings
;
10611 fn_context
= decl_function_context (TYPE_MAIN_DECL (type
));
10612 /* Also avoid push_to_top_level for a lambda in an NSDMI. */
10613 if (!fn_context
&& LAMBDA_TYPE_P (type
) && TYPE_CLASS_SCOPE_P (type
))
10614 fn_context
= error_mark_node
;
10616 push_to_top_level ();
10619 cp_unevaluated_operand
= 0;
10620 c_inhibit_evaluation_warnings
= 0;
10622 /* Use #pragma pack from the template context. */
10623 saved_maximum_field_alignment
= maximum_field_alignment
;
10624 maximum_field_alignment
= TYPE_PRECISION (pattern
);
10626 SET_CLASSTYPE_INTERFACE_UNKNOWN (type
);
10628 /* Set the input location to the most specialized template definition.
10629 This is needed if tsubsting causes an error. */
10630 typedecl
= TYPE_MAIN_DECL (pattern
);
10631 input_location
= DECL_SOURCE_LOCATION (TYPE_NAME (type
)) =
10632 DECL_SOURCE_LOCATION (typedecl
);
10634 TYPE_PACKED (type
) = TYPE_PACKED (pattern
);
10635 SET_TYPE_ALIGN (type
, TYPE_ALIGN (pattern
));
10636 TYPE_USER_ALIGN (type
) = TYPE_USER_ALIGN (pattern
);
10637 CLASSTYPE_NON_AGGREGATE (type
) = CLASSTYPE_NON_AGGREGATE (pattern
);
10638 if (ANON_AGGR_TYPE_P (pattern
))
10639 SET_ANON_AGGR_TYPE_P (type
);
10640 if (CLASSTYPE_VISIBILITY_SPECIFIED (pattern
))
10642 CLASSTYPE_VISIBILITY_SPECIFIED (type
) = 1;
10643 CLASSTYPE_VISIBILITY (type
) = CLASSTYPE_VISIBILITY (pattern
);
10644 /* Adjust visibility for template arguments. */
10645 determine_visibility (TYPE_MAIN_DECL (type
));
10647 if (CLASS_TYPE_P (type
))
10648 CLASSTYPE_FINAL (type
) = CLASSTYPE_FINAL (pattern
);
10650 pbinfo
= TYPE_BINFO (pattern
);
10652 /* We should never instantiate a nested class before its enclosing
10653 class; we need to look up the nested class by name before we can
10654 instantiate it, and that lookup should instantiate the enclosing
10656 gcc_assert (!DECL_CLASS_SCOPE_P (TYPE_MAIN_DECL (pattern
))
10657 || COMPLETE_OR_OPEN_TYPE_P (TYPE_CONTEXT (type
)));
10659 base_list
= NULL_TREE
;
10660 if (BINFO_N_BASE_BINFOS (pbinfo
))
10666 /* We must enter the scope containing the type, as that is where
10667 the accessibility of types named in dependent bases are
10669 pushed_scope
= push_scope (CP_TYPE_CONTEXT (type
));
10671 /* Substitute into each of the bases to determine the actual
10673 for (i
= 0; BINFO_BASE_ITERATE (pbinfo
, i
, pbase_binfo
); i
++)
10676 tree access
= BINFO_BASE_ACCESS (pbinfo
, i
);
10677 tree expanded_bases
= NULL_TREE
;
10680 if (PACK_EXPANSION_P (BINFO_TYPE (pbase_binfo
)))
10683 tsubst_pack_expansion (BINFO_TYPE (pbase_binfo
),
10684 args
, tf_error
, NULL_TREE
);
10685 if (expanded_bases
== error_mark_node
)
10688 len
= TREE_VEC_LENGTH (expanded_bases
);
10691 for (idx
= 0; idx
< len
; idx
++)
10693 if (expanded_bases
)
10694 /* Extract the already-expanded base class. */
10695 base
= TREE_VEC_ELT (expanded_bases
, idx
);
10697 /* Substitute to figure out the base class. */
10698 base
= tsubst (BINFO_TYPE (pbase_binfo
), args
, tf_error
,
10701 if (base
== error_mark_node
)
10704 base_list
= tree_cons (access
, base
, base_list
);
10705 if (BINFO_VIRTUAL_P (pbase_binfo
))
10706 TREE_TYPE (base_list
) = integer_type_node
;
10710 /* The list is now in reverse order; correct that. */
10711 base_list
= nreverse (base_list
);
10714 pop_scope (pushed_scope
);
10716 /* Now call xref_basetypes to set up all the base-class
10718 xref_basetypes (type
, base_list
);
10720 apply_late_template_attributes (&type
, TYPE_ATTRIBUTES (pattern
),
10721 (int) ATTR_FLAG_TYPE_IN_PLACE
,
10722 args
, tf_error
, NULL_TREE
);
10723 fixup_attribute_variants (type
);
10725 /* Now that our base classes are set up, enter the scope of the
10726 class, so that name lookups into base classes, etc. will work
10727 correctly. This is precisely analogous to what we do in
10728 begin_class_definition when defining an ordinary non-template
10729 class, except we also need to push the enclosing classes. */
10730 push_nested_class (type
);
10732 /* Now members are processed in the order of declaration. */
10733 for (member
= CLASSTYPE_DECL_LIST (pattern
);
10734 member
; member
= TREE_CHAIN (member
))
10736 tree t
= TREE_VALUE (member
);
10738 if (TREE_PURPOSE (member
))
10742 if (LAMBDA_TYPE_P (t
))
10743 /* A closure type for a lambda in an NSDMI or default argument.
10744 Ignore it; it will be regenerated when needed. */
10747 /* Build new CLASSTYPE_NESTED_UTDS. */
10750 bool class_template_p
;
10752 class_template_p
= (TREE_CODE (t
) != ENUMERAL_TYPE
10753 && TYPE_LANG_SPECIFIC (t
)
10754 && CLASSTYPE_IS_TEMPLATE (t
));
10755 /* If the member is a class template, then -- even after
10756 substitution -- there may be dependent types in the
10757 template argument list for the class. We increment
10758 PROCESSING_TEMPLATE_DECL so that dependent_type_p, as
10759 that function will assume that no types are dependent
10760 when outside of a template. */
10761 if (class_template_p
)
10762 ++processing_template_decl
;
10763 newtag
= tsubst (t
, args
, tf_error
, NULL_TREE
);
10764 if (class_template_p
)
10765 --processing_template_decl
;
10766 if (newtag
== error_mark_node
)
10769 if (TREE_CODE (newtag
) != ENUMERAL_TYPE
)
10771 tree name
= TYPE_IDENTIFIER (t
);
10773 if (class_template_p
)
10774 /* Unfortunately, lookup_template_class sets
10775 CLASSTYPE_IMPLICIT_INSTANTIATION for a partial
10776 instantiation (i.e., for the type of a member
10777 template class nested within a template class.)
10778 This behavior is required for
10779 maybe_process_partial_specialization to work
10780 correctly, but is not accurate in this case;
10781 the TAG is not an instantiation of anything.
10782 (The corresponding TEMPLATE_DECL is an
10783 instantiation, but the TYPE is not.) */
10784 CLASSTYPE_USE_TEMPLATE (newtag
) = 0;
10786 /* Now, we call pushtag to put this NEWTAG into the scope of
10787 TYPE. We first set up the IDENTIFIER_TYPE_VALUE to avoid
10788 pushtag calling push_template_decl. We don't have to do
10789 this for enums because it will already have been done in
10792 SET_IDENTIFIER_TYPE_VALUE (name
, newtag
);
10793 pushtag (name
, newtag
, /*tag_scope=*/ts_current
);
10796 else if (DECL_DECLARES_FUNCTION_P (t
))
10800 if (TREE_CODE (t
) == TEMPLATE_DECL
)
10801 ++processing_template_decl
;
10802 r
= tsubst (t
, args
, tf_error
, NULL_TREE
);
10803 if (TREE_CODE (t
) == TEMPLATE_DECL
)
10804 --processing_template_decl
;
10805 set_current_access_from_decl (r
);
10806 finish_member_declaration (r
);
10807 /* Instantiate members marked with attribute used. */
10808 if (r
!= error_mark_node
&& DECL_PRESERVE_P (r
))
10810 if (TREE_CODE (r
) == FUNCTION_DECL
10811 && DECL_OMP_DECLARE_REDUCTION_P (r
))
10812 cp_check_omp_declare_reduction (r
);
10814 else if ((DECL_CLASS_TEMPLATE_P (t
) || DECL_IMPLICIT_TYPEDEF_P (t
))
10815 && LAMBDA_TYPE_P (TREE_TYPE (t
)))
10816 /* A closure type for a lambda in an NSDMI or default argument.
10817 Ignore it; it will be regenerated when needed. */;
10820 /* Build new TYPE_FIELDS. */
10821 if (TREE_CODE (t
) == STATIC_ASSERT
)
10825 ++c_inhibit_evaluation_warnings
;
10827 tsubst_expr (STATIC_ASSERT_CONDITION (t
), args
,
10828 tf_warning_or_error
, NULL_TREE
,
10829 /*integral_constant_expression_p=*/true);
10830 --c_inhibit_evaluation_warnings
;
10832 finish_static_assert (condition
,
10833 STATIC_ASSERT_MESSAGE (t
),
10834 STATIC_ASSERT_SOURCE_LOCATION (t
),
10835 /*member_p=*/true);
10837 else if (TREE_CODE (t
) != CONST_DECL
)
10840 tree vec
= NULL_TREE
;
10843 /* The file and line for this declaration, to
10844 assist in error message reporting. Since we
10845 called push_tinst_level above, we don't need to
10847 input_location
= DECL_SOURCE_LOCATION (t
);
10849 if (TREE_CODE (t
) == TEMPLATE_DECL
)
10850 ++processing_template_decl
;
10851 r
= tsubst (t
, args
, tf_warning_or_error
, NULL_TREE
);
10852 if (TREE_CODE (t
) == TEMPLATE_DECL
)
10853 --processing_template_decl
;
10855 if (TREE_CODE (r
) == TREE_VEC
)
10857 /* A capture pack became multiple fields. */
10859 len
= TREE_VEC_LENGTH (vec
);
10862 for (int i
= 0; i
< len
; ++i
)
10865 r
= TREE_VEC_ELT (vec
, i
);
10870 [t]he initialization (and any associated
10871 side-effects) of a static data member does
10872 not occur unless the static data member is
10873 itself used in a way that requires the
10874 definition of the static data member to
10877 Therefore, we do not substitute into the
10878 initialized for the static data member here. */
10879 finish_static_data_member_decl
10881 /*init=*/NULL_TREE
,
10882 /*init_const_expr_p=*/false,
10883 /*asmspec_tree=*/NULL_TREE
,
10885 /* Instantiate members marked with attribute used. */
10886 if (r
!= error_mark_node
&& DECL_PRESERVE_P (r
))
10889 else if (TREE_CODE (r
) == FIELD_DECL
)
10891 /* Determine whether R has a valid type and can be
10892 completed later. If R is invalid, then its type
10893 is replaced by error_mark_node. */
10894 tree rtype
= TREE_TYPE (r
);
10895 if (can_complete_type_without_circularity (rtype
))
10896 complete_type (rtype
);
10898 if (!complete_or_array_type_p (rtype
))
10900 /* If R's type couldn't be completed and
10901 it isn't a flexible array member (whose
10902 type is incomplete by definition) give
10904 cxx_incomplete_type_error (r
, rtype
);
10905 TREE_TYPE (r
) = error_mark_node
;
10909 /* If it is a TYPE_DECL for a class-scoped ENUMERAL_TYPE,
10910 such a thing will already have been added to the field
10911 list by tsubst_enum in finish_member_declaration in the
10912 CLASSTYPE_NESTED_UTDS case above. */
10913 if (!(TREE_CODE (r
) == TYPE_DECL
10914 && TREE_CODE (TREE_TYPE (r
)) == ENUMERAL_TYPE
10915 && DECL_ARTIFICIAL (r
)))
10917 set_current_access_from_decl (r
);
10918 finish_member_declaration (r
);
10926 if (TYPE_P (t
) || DECL_CLASS_TEMPLATE_P (t
)
10927 || DECL_TEMPLATE_TEMPLATE_PARM_P (t
))
10929 /* Build new CLASSTYPE_FRIEND_CLASSES. */
10931 tree friend_type
= t
;
10932 bool adjust_processing_template_decl
= false;
10934 if (TREE_CODE (friend_type
) == TEMPLATE_DECL
)
10936 /* template <class T> friend class C; */
10937 friend_type
= tsubst_friend_class (friend_type
, args
);
10938 adjust_processing_template_decl
= true;
10940 else if (TREE_CODE (friend_type
) == UNBOUND_CLASS_TEMPLATE
)
10942 /* template <class T> friend class C::D; */
10943 friend_type
= tsubst (friend_type
, args
,
10944 tf_warning_or_error
, NULL_TREE
);
10945 if (TREE_CODE (friend_type
) == TEMPLATE_DECL
)
10946 friend_type
= TREE_TYPE (friend_type
);
10947 adjust_processing_template_decl
= true;
10949 else if (TREE_CODE (friend_type
) == TYPENAME_TYPE
10950 || TREE_CODE (friend_type
) == TEMPLATE_TYPE_PARM
)
10952 /* This could be either
10956 when dependent_type_p is false or
10958 template <class U> friend class T::C;
10961 /* Bump processing_template_decl in case this is something like
10962 template <class T> friend struct A<T>::B. */
10963 ++processing_template_decl
;
10964 friend_type
= tsubst (friend_type
, args
,
10965 tf_warning_or_error
, NULL_TREE
);
10966 if (dependent_type_p (friend_type
))
10967 adjust_processing_template_decl
= true;
10968 --processing_template_decl
;
10970 else if (TREE_CODE (friend_type
) != BOUND_TEMPLATE_TEMPLATE_PARM
10971 && !CLASSTYPE_USE_TEMPLATE (friend_type
)
10972 && TYPE_HIDDEN_P (friend_type
))
10976 where C hasn't been declared yet. Let's lookup name
10977 from namespace scope directly, bypassing any name that
10978 come from dependent base class. */
10979 tree ns
= decl_namespace_context (TYPE_MAIN_DECL (friend_type
));
10981 /* The call to xref_tag_from_type does injection for friend
10983 push_nested_namespace (ns
);
10985 xref_tag_from_type (friend_type
, NULL_TREE
,
10986 /*tag_scope=*/ts_current
);
10987 pop_nested_namespace (ns
);
10989 else if (uses_template_parms (friend_type
))
10990 /* friend class C<T>; */
10991 friend_type
= tsubst (friend_type
, args
,
10992 tf_warning_or_error
, NULL_TREE
);
10997 where C is already declared or
10999 friend class C<int>;
11001 We don't have to do anything in these cases. */
11003 if (adjust_processing_template_decl
)
11004 /* Trick make_friend_class into realizing that the friend
11005 we're adding is a template, not an ordinary class. It's
11006 important that we use make_friend_class since it will
11007 perform some error-checking and output cross-reference
11009 ++processing_template_decl
;
11011 if (friend_type
!= error_mark_node
)
11012 make_friend_class (type
, friend_type
, /*complain=*/false);
11014 if (adjust_processing_template_decl
)
11015 --processing_template_decl
;
11019 /* Build new DECL_FRIENDLIST. */
11022 /* The file and line for this declaration, to
11023 assist in error message reporting. Since we
11024 called push_tinst_level above, we don't need to
11026 input_location
= DECL_SOURCE_LOCATION (t
);
11028 if (TREE_CODE (t
) == TEMPLATE_DECL
)
11030 ++processing_template_decl
;
11031 push_deferring_access_checks (dk_no_check
);
11034 r
= tsubst_friend_function (t
, args
);
11035 add_friend (type
, r
, /*complain=*/false);
11036 if (TREE_CODE (t
) == TEMPLATE_DECL
)
11038 pop_deferring_access_checks ();
11039 --processing_template_decl
;
11047 /* Restore these before substituting into the lambda capture
11049 cp_unevaluated_operand
= saved_unevaluated_operand
;
11050 c_inhibit_evaluation_warnings
= saved_inhibit_evaluation_warnings
;
11053 /* Set the file and line number information to whatever is given for
11054 the class itself. This puts error messages involving generated
11055 implicit functions at a predictable point, and the same point
11056 that would be used for non-template classes. */
11057 input_location
= DECL_SOURCE_LOCATION (typedecl
);
11059 unreverse_member_declarations (type
);
11060 finish_struct_1 (type
);
11061 TYPE_BEING_DEFINED (type
) = 0;
11063 /* We don't instantiate default arguments for member functions. 14.7.1:
11065 The implicit instantiation of a class template specialization causes
11066 the implicit instantiation of the declarations, but not of the
11067 definitions or default arguments, of the class member functions,
11068 member classes, static data members and member templates.... */
11070 /* Some typedefs referenced from within the template code need to be access
11071 checked at template instantiation time, i.e now. These types were
11072 added to the template at parsing time. Let's get those and perform
11073 the access checks then. */
11074 perform_typedefs_access_check (pattern
, args
);
11075 perform_deferred_access_checks (tf_warning_or_error
);
11076 pop_nested_class ();
11077 maximum_field_alignment
= saved_maximum_field_alignment
;
11079 pop_from_top_level ();
11080 pop_deferring_access_checks ();
11081 pop_tinst_level ();
11083 /* The vtable for a template class can be emitted in any translation
11084 unit in which the class is instantiated. When there is no key
11085 method, however, finish_struct_1 will already have added TYPE to
11086 the keyed_classes. */
11087 if (TYPE_CONTAINS_VPTR_P (type
) && CLASSTYPE_KEY_METHOD (type
))
11088 vec_safe_push (keyed_classes
, type
);
11093 /* Wrapper for instantiate_class_template_1. */
11096 instantiate_class_template (tree type
)
11099 timevar_push (TV_TEMPLATE_INST
);
11100 ret
= instantiate_class_template_1 (type
);
11101 timevar_pop (TV_TEMPLATE_INST
);
11106 tsubst_template_arg (tree t
, tree args
, tsubst_flags_t complain
, tree in_decl
)
11112 else if (TYPE_P (t
))
11113 r
= tsubst (t
, args
, complain
, in_decl
);
11116 if (!(complain
& tf_warning
))
11117 ++c_inhibit_evaluation_warnings
;
11118 r
= tsubst_expr (t
, args
, complain
, in_decl
,
11119 /*integral_constant_expression_p=*/true);
11120 if (!(complain
& tf_warning
))
11121 --c_inhibit_evaluation_warnings
;
11126 /* Given a function parameter pack TMPL_PARM and some function parameters
11127 instantiated from it at *SPEC_P, return a NONTYPE_ARGUMENT_PACK of them
11128 and set *SPEC_P to point at the next point in the list. */
11131 extract_fnparm_pack (tree tmpl_parm
, tree
*spec_p
)
11133 /* Collect all of the extra "packed" parameters into an
11136 tree argpack
= make_node (NONTYPE_ARGUMENT_PACK
);
11137 tree spec_parm
= *spec_p
;
11140 for (len
= 0; spec_parm
; ++len
, spec_parm
= TREE_CHAIN (spec_parm
))
11142 && !function_parameter_expanded_from_pack_p (spec_parm
, tmpl_parm
))
11145 /* Fill in PARMVEC and PARMTYPEVEC with all of the parameters. */
11146 parmvec
= make_tree_vec (len
);
11147 spec_parm
= *spec_p
;
11148 for (i
= 0; i
< len
; i
++, spec_parm
= DECL_CHAIN (spec_parm
))
11150 tree elt
= spec_parm
;
11151 if (DECL_PACK_P (elt
))
11152 elt
= make_pack_expansion (elt
);
11153 TREE_VEC_ELT (parmvec
, i
) = elt
;
11156 /* Build the argument packs. */
11157 SET_ARGUMENT_PACK_ARGS (argpack
, parmvec
);
11158 *spec_p
= spec_parm
;
11163 /* Give a chain SPEC_PARM of PARM_DECLs, pack them into a
11164 NONTYPE_ARGUMENT_PACK. */
11167 make_fnparm_pack (tree spec_parm
)
11169 return extract_fnparm_pack (NULL_TREE
, &spec_parm
);
11172 /* Return 1 if the Ith element of the argument pack ARG_PACK is a
11173 pack expansion with no extra args, 2 if it has extra args, or 0
11174 if it is not a pack expansion. */
11177 argument_pack_element_is_expansion_p (tree arg_pack
, int i
)
11179 tree vec
= ARGUMENT_PACK_ARGS (arg_pack
);
11180 if (i
>= TREE_VEC_LENGTH (vec
))
11182 tree elt
= TREE_VEC_ELT (vec
, i
);
11184 /* A decl pack is itself an expansion. */
11185 elt
= TREE_TYPE (elt
);
11186 if (!PACK_EXPANSION_P (elt
))
11188 if (PACK_EXPANSION_EXTRA_ARGS (elt
))
11194 /* Creates and return an ARGUMENT_PACK_SELECT tree node. */
11197 make_argument_pack_select (tree arg_pack
, unsigned index
)
11199 tree aps
= make_node (ARGUMENT_PACK_SELECT
);
11201 ARGUMENT_PACK_SELECT_FROM_PACK (aps
) = arg_pack
;
11202 ARGUMENT_PACK_SELECT_INDEX (aps
) = index
;
11207 /* This is a subroutine of tsubst_pack_expansion.
11209 It returns TRUE if we need to use the PACK_EXPANSION_EXTRA_ARGS
11210 mechanism to store the (non complete list of) arguments of the
11211 substitution and return a non substituted pack expansion, in order
11212 to wait for when we have enough arguments to really perform the
11216 use_pack_expansion_extra_args_p (tree parm_packs
,
11218 bool has_empty_arg
)
11220 /* If one pack has an expansion and another pack has a normal
11221 argument or if one pack has an empty argument and an another
11222 one hasn't then tsubst_pack_expansion cannot perform the
11223 substitution and need to fall back on the
11224 PACK_EXPANSION_EXTRA mechanism. */
11225 if (parm_packs
== NULL_TREE
)
11227 else if (has_empty_arg
)
11230 bool has_expansion_arg
= false;
11231 for (int i
= 0 ; i
< arg_pack_len
; ++i
)
11233 bool has_non_expansion_arg
= false;
11234 for (tree parm_pack
= parm_packs
;
11236 parm_pack
= TREE_CHAIN (parm_pack
))
11238 tree arg
= TREE_VALUE (parm_pack
);
11240 int exp
= argument_pack_element_is_expansion_p (arg
, i
);
11242 /* We can't substitute a pack expansion with extra args into
11246 has_expansion_arg
= true;
11248 has_non_expansion_arg
= true;
11251 if (has_expansion_arg
&& has_non_expansion_arg
)
11257 /* [temp.variadic]/6 says that:
11259 The instantiation of a pack expansion [...]
11260 produces a list E1,E2, ..., En, where N is the number of elements
11261 in the pack expansion parameters.
11263 This subroutine of tsubst_pack_expansion produces one of these Ei.
11265 PATTERN is the pattern of the pack expansion. PARM_PACKS is a
11266 TREE_LIST in which each TREE_PURPOSE is a parameter pack of
11267 PATTERN, and each TREE_VALUE is its corresponding argument pack.
11268 INDEX is the index 'i' of the element Ei to produce. ARGS,
11269 COMPLAIN, and IN_DECL are the same parameters as for the
11270 tsubst_pack_expansion function.
11272 The function returns the resulting Ei upon successful completion,
11273 or error_mark_node.
11275 Note that this function possibly modifies the ARGS parameter, so
11276 it's the responsibility of the caller to restore it. */
11279 gen_elem_of_pack_expansion_instantiation (tree pattern
,
11282 tree args
/* This parm gets
11284 tsubst_flags_t complain
,
11288 bool ith_elem_is_expansion
= false;
11290 /* For each parameter pack, change the substitution of the parameter
11291 pack to the ith argument in its argument pack, then expand the
11293 for (tree pack
= parm_packs
; pack
; pack
= TREE_CHAIN (pack
))
11295 tree parm
= TREE_PURPOSE (pack
);
11296 tree arg_pack
= TREE_VALUE (pack
);
11297 tree aps
; /* instance of ARGUMENT_PACK_SELECT. */
11299 ith_elem_is_expansion
|=
11300 argument_pack_element_is_expansion_p (arg_pack
, index
);
11302 /* Select the Ith argument from the pack. */
11303 if (TREE_CODE (parm
) == PARM_DECL
11305 || TREE_CODE (parm
) == FIELD_DECL
)
11309 aps
= make_argument_pack_select (arg_pack
, index
);
11310 if (!mark_used (parm
, complain
) && !(complain
& tf_error
))
11311 return error_mark_node
;
11312 register_local_specialization (aps
, parm
);
11315 aps
= retrieve_local_specialization (parm
);
11320 template_parm_level_and_index (parm
, &level
, &idx
);
11324 aps
= make_argument_pack_select (arg_pack
, index
);
11325 /* Update the corresponding argument. */
11326 TMPL_ARG (args
, level
, idx
) = aps
;
11329 /* Re-use the ARGUMENT_PACK_SELECT. */
11330 aps
= TMPL_ARG (args
, level
, idx
);
11332 ARGUMENT_PACK_SELECT_INDEX (aps
) = index
;
11335 /* Substitute into the PATTERN with the (possibly altered)
11337 if (pattern
== in_decl
)
11338 /* Expanding a fixed parameter pack from
11339 coerce_template_parameter_pack. */
11340 t
= tsubst_decl (pattern
, args
, complain
);
11341 else if (pattern
== error_mark_node
)
11342 t
= error_mark_node
;
11343 else if (constraint_p (pattern
))
11345 if (processing_template_decl
)
11346 t
= tsubst_constraint (pattern
, args
, complain
, in_decl
);
11348 t
= (constraints_satisfied_p (pattern
, args
)
11349 ? boolean_true_node
: boolean_false_node
);
11351 else if (!TYPE_P (pattern
))
11352 t
= tsubst_expr (pattern
, args
, complain
, in_decl
,
11353 /*integral_constant_expression_p=*/false);
11355 t
= tsubst (pattern
, args
, complain
, in_decl
);
11357 /* If the Ith argument pack element is a pack expansion, then
11358 the Ith element resulting from the substituting is going to
11359 be a pack expansion as well. */
11360 if (ith_elem_is_expansion
)
11361 t
= make_pack_expansion (t
, complain
);
11366 /* When the unexpanded parameter pack in a fold expression expands to an empty
11367 sequence, the value of the expression is as follows; the program is
11368 ill-formed if the operator is not listed in this table.
11375 expand_empty_fold (tree t
, tsubst_flags_t complain
)
11377 tree_code code
= (tree_code
)TREE_INT_CST_LOW (TREE_OPERAND (t
, 0));
11378 if (!FOLD_EXPR_MODIFY_P (t
))
11381 case TRUTH_ANDIF_EXPR
:
11382 return boolean_true_node
;
11383 case TRUTH_ORIF_EXPR
:
11384 return boolean_false_node
;
11385 case COMPOUND_EXPR
:
11391 if (complain
& tf_error
)
11392 error_at (location_of (t
),
11393 "fold of empty expansion over %O", code
);
11394 return error_mark_node
;
11397 /* Given a fold-expression T and a current LEFT and RIGHT operand,
11398 form an expression that combines the two terms using the
11402 fold_expression (tree t
, tree left
, tree right
, tsubst_flags_t complain
)
11404 tree op
= FOLD_EXPR_OP (t
);
11405 tree_code code
= (tree_code
)TREE_INT_CST_LOW (op
);
11407 // Handle compound assignment operators.
11408 if (FOLD_EXPR_MODIFY_P (t
))
11409 return build_x_modify_expr (input_location
, left
, code
, right
, complain
);
11413 case COMPOUND_EXPR
:
11414 return build_x_compound_expr (input_location
, left
, right
, complain
);
11416 return build_m_component_ref (left
, right
, complain
);
11418 return build_x_binary_op (input_location
, code
,
11419 left
, TREE_CODE (left
),
11420 right
, TREE_CODE (right
),
11426 /* Substitute ARGS into the pack of a fold expression T. */
11429 tsubst_fold_expr_pack (tree t
, tree args
, tsubst_flags_t complain
, tree in_decl
)
11431 return tsubst_pack_expansion (FOLD_EXPR_PACK (t
), args
, complain
, in_decl
);
11434 /* Substitute ARGS into the pack of a fold expression T. */
11437 tsubst_fold_expr_init (tree t
, tree args
, tsubst_flags_t complain
, tree in_decl
)
11439 return tsubst_expr (FOLD_EXPR_INIT (t
), args
, complain
, in_decl
, false);
11442 /* Expand a PACK of arguments into a grouped as left fold.
11443 Given a pack containing elements A0, A1, ..., An and an
11444 operator @, this builds the expression:
11446 ((A0 @ A1) @ A2) ... @ An
11448 Note that PACK must not be empty.
11450 The operator is defined by the original fold expression T. */
11453 expand_left_fold (tree t
, tree pack
, tsubst_flags_t complain
)
11455 tree left
= TREE_VEC_ELT (pack
, 0);
11456 for (int i
= 1; i
< TREE_VEC_LENGTH (pack
); ++i
)
11458 tree right
= TREE_VEC_ELT (pack
, i
);
11459 left
= fold_expression (t
, left
, right
, complain
);
11464 /* Substitute into a unary left fold expression. */
11467 tsubst_unary_left_fold (tree t
, tree args
, tsubst_flags_t complain
,
11470 tree pack
= tsubst_fold_expr_pack (t
, args
, complain
, in_decl
);
11471 if (pack
== error_mark_node
)
11472 return error_mark_node
;
11473 if (PACK_EXPANSION_P (pack
))
11475 tree r
= copy_node (t
);
11476 FOLD_EXPR_PACK (r
) = pack
;
11479 if (TREE_VEC_LENGTH (pack
) == 0)
11480 return expand_empty_fold (t
, complain
);
11482 return expand_left_fold (t
, pack
, complain
);
11485 /* Substitute into a binary left fold expression.
11487 Do ths by building a single (non-empty) vector of argumnts and
11488 building the expression from those elements. */
11491 tsubst_binary_left_fold (tree t
, tree args
, tsubst_flags_t complain
,
11494 tree pack
= tsubst_fold_expr_pack (t
, args
, complain
, in_decl
);
11495 if (pack
== error_mark_node
)
11496 return error_mark_node
;
11497 tree init
= tsubst_fold_expr_init (t
, args
, complain
, in_decl
);
11498 if (init
== error_mark_node
)
11499 return error_mark_node
;
11501 if (PACK_EXPANSION_P (pack
))
11503 tree r
= copy_node (t
);
11504 FOLD_EXPR_PACK (r
) = pack
;
11505 FOLD_EXPR_INIT (r
) = init
;
11509 tree vec
= make_tree_vec (TREE_VEC_LENGTH (pack
) + 1);
11510 TREE_VEC_ELT (vec
, 0) = init
;
11511 for (int i
= 0; i
< TREE_VEC_LENGTH (pack
); ++i
)
11512 TREE_VEC_ELT (vec
, i
+ 1) = TREE_VEC_ELT (pack
, i
);
11514 return expand_left_fold (t
, vec
, complain
);
11517 /* Expand a PACK of arguments into a grouped as right fold.
11518 Given a pack containing elementns A0, A1, ..., and an
11519 operator @, this builds the expression:
11521 A0@ ... (An-2 @ (An-1 @ An))
11523 Note that PACK must not be empty.
11525 The operator is defined by the original fold expression T. */
11528 expand_right_fold (tree t
, tree pack
, tsubst_flags_t complain
)
11530 // Build the expression.
11531 int n
= TREE_VEC_LENGTH (pack
);
11532 tree right
= TREE_VEC_ELT (pack
, n
- 1);
11533 for (--n
; n
!= 0; --n
)
11535 tree left
= TREE_VEC_ELT (pack
, n
- 1);
11536 right
= fold_expression (t
, left
, right
, complain
);
11541 /* Substitute into a unary right fold expression. */
11544 tsubst_unary_right_fold (tree t
, tree args
, tsubst_flags_t complain
,
11547 tree pack
= tsubst_fold_expr_pack (t
, args
, complain
, in_decl
);
11548 if (pack
== error_mark_node
)
11549 return error_mark_node
;
11550 if (PACK_EXPANSION_P (pack
))
11552 tree r
= copy_node (t
);
11553 FOLD_EXPR_PACK (r
) = pack
;
11556 if (TREE_VEC_LENGTH (pack
) == 0)
11557 return expand_empty_fold (t
, complain
);
11559 return expand_right_fold (t
, pack
, complain
);
11562 /* Substitute into a binary right fold expression.
11564 Do ths by building a single (non-empty) vector of arguments and
11565 building the expression from those elements. */
11568 tsubst_binary_right_fold (tree t
, tree args
, tsubst_flags_t complain
,
11571 tree pack
= tsubst_fold_expr_pack (t
, args
, complain
, in_decl
);
11572 if (pack
== error_mark_node
)
11573 return error_mark_node
;
11574 tree init
= tsubst_fold_expr_init (t
, args
, complain
, in_decl
);
11575 if (init
== error_mark_node
)
11576 return error_mark_node
;
11578 if (PACK_EXPANSION_P (pack
))
11580 tree r
= copy_node (t
);
11581 FOLD_EXPR_PACK (r
) = pack
;
11582 FOLD_EXPR_INIT (r
) = init
;
11586 int n
= TREE_VEC_LENGTH (pack
);
11587 tree vec
= make_tree_vec (n
+ 1);
11588 for (int i
= 0; i
< n
; ++i
)
11589 TREE_VEC_ELT (vec
, i
) = TREE_VEC_ELT (pack
, i
);
11590 TREE_VEC_ELT (vec
, n
) = init
;
11592 return expand_right_fold (t
, vec
, complain
);
11595 /* Walk through the pattern of a pack expansion, adding everything in
11596 local_specializations to a list. */
11601 tsubst_flags_t complain
;
11604 extract_locals_r (tree
*tp
, int */
*walk_subtrees*/
, void *data_
)
11606 el_data
&data
= *reinterpret_cast<el_data
*>(data_
);
11607 tree
*extra
= &data
.extra
;
11608 tsubst_flags_t complain
= data
.complain
;
11609 if (tree spec
= retrieve_local_specialization (*tp
))
11611 if (TREE_CODE (spec
) == NONTYPE_ARGUMENT_PACK
)
11613 /* Maybe pull out the PARM_DECL for a partial instantiation. */
11614 tree args
= ARGUMENT_PACK_ARGS (spec
);
11615 if (TREE_VEC_LENGTH (args
) == 1)
11617 tree elt
= TREE_VEC_ELT (args
, 0);
11618 if (PACK_EXPANSION_P (elt
))
11619 elt
= PACK_EXPANSION_PATTERN (elt
);
11620 if (DECL_PACK_P (elt
))
11623 if (TREE_CODE (spec
) == NONTYPE_ARGUMENT_PACK
)
11625 /* Handle lambda capture here, since we aren't doing any
11626 substitution now, and so tsubst_copy won't call
11627 process_outer_var_ref. */
11628 tree args
= ARGUMENT_PACK_ARGS (spec
);
11629 int len
= TREE_VEC_LENGTH (args
);
11630 for (int i
= 0; i
< len
; ++i
)
11632 tree arg
= TREE_VEC_ELT (args
, i
);
11634 if (outer_automatic_var_p (arg
))
11635 carg
= process_outer_var_ref (arg
, complain
);
11638 /* Make a new NONTYPE_ARGUMENT_PACK of the capture
11642 spec
= copy_node (spec
);
11643 args
= copy_node (args
);
11644 SET_ARGUMENT_PACK_ARGS (spec
, args
);
11645 register_local_specialization (spec
, *tp
);
11647 TREE_VEC_ELT (args
, i
) = carg
;
11652 if (outer_automatic_var_p (spec
))
11653 spec
= process_outer_var_ref (spec
, complain
);
11654 *extra
= tree_cons (*tp
, spec
, *extra
);
11659 extract_local_specs (tree pattern
, tsubst_flags_t complain
)
11661 el_data data
= { NULL_TREE
, complain
};
11662 cp_walk_tree_without_duplicates (&pattern
, extract_locals_r
, &data
);
11666 /* Substitute ARGS into T, which is an pack expansion
11667 (i.e. TYPE_PACK_EXPANSION or EXPR_PACK_EXPANSION). Returns a
11668 TREE_VEC with the substituted arguments, a PACK_EXPANSION_* node
11669 (if only a partial substitution could be performed) or
11670 ERROR_MARK_NODE if there was an error. */
11672 tsubst_pack_expansion (tree t
, tree args
, tsubst_flags_t complain
,
11676 tree pack
, packs
= NULL_TREE
;
11677 bool unsubstituted_packs
= false;
11678 bool unsubstituted_fn_pack
= false;
11681 hash_map
<tree
, tree
> *saved_local_specializations
= NULL
;
11682 bool need_local_specializations
= false;
11685 gcc_assert (PACK_EXPANSION_P (t
));
11686 pattern
= PACK_EXPANSION_PATTERN (t
);
11688 /* Add in any args remembered from an earlier partial instantiation. */
11689 tree extra
= PACK_EXPANSION_EXTRA_ARGS (t
);
11690 if (extra
&& TREE_CODE (extra
) == TREE_LIST
)
11692 for (tree elt
= TREE_CHAIN (extra
); elt
; elt
= TREE_CHAIN (elt
))
11694 /* The partial instantiation involved local declarations collected in
11695 extract_local_specs; map from the general template to our local
11697 tree gen
= TREE_PURPOSE (elt
);
11698 tree inst
= TREE_VALUE (elt
);
11700 if (tree local
= retrieve_local_specialization (inst
))
11702 /* else inst is already a full instantiation of the pack. */
11703 register_local_specialization (inst
, gen
);
11705 gcc_assert (!TREE_PURPOSE (extra
));
11706 extra
= TREE_VALUE (extra
);
11708 args
= add_to_template_args (extra
, args
);
11710 levels
= TMPL_ARGS_DEPTH (args
);
11712 /* Determine the argument packs that will instantiate the parameter
11713 packs used in the expansion expression. While we're at it,
11714 compute the number of arguments to be expanded and make sure it
11716 for (pack
= PACK_EXPANSION_PARAMETER_PACKS (t
); pack
;
11717 pack
= TREE_CHAIN (pack
))
11719 tree parm_pack
= TREE_VALUE (pack
);
11720 tree arg_pack
= NULL_TREE
;
11721 tree orig_arg
= NULL_TREE
;
11724 if (TREE_CODE (parm_pack
) == BASES
)
11726 gcc_assert (parm_pack
== pattern
);
11727 if (BASES_DIRECT (parm_pack
))
11728 return calculate_direct_bases (tsubst_expr (BASES_TYPE (parm_pack
),
11729 args
, complain
, in_decl
, false));
11731 return calculate_bases (tsubst_expr (BASES_TYPE (parm_pack
),
11732 args
, complain
, in_decl
, false));
11734 else if (builtin_pack_call_p (parm_pack
))
11736 /* ??? Support use in other patterns. */
11737 gcc_assert (parm_pack
== pattern
);
11738 return expand_builtin_pack_call (parm_pack
, args
,
11739 complain
, in_decl
);
11741 else if (TREE_CODE (parm_pack
) == PARM_DECL
)
11743 /* We know we have correct local_specializations if this
11744 expansion is at function scope, or if we're dealing with a
11745 local parameter in a requires expression; for the latter,
11746 tsubst_requires_expr set it up appropriately. */
11747 if (PACK_EXPANSION_LOCAL_P (t
) || CONSTRAINT_VAR_P (parm_pack
))
11748 arg_pack
= retrieve_local_specialization (parm_pack
);
11750 /* We can't rely on local_specializations for a parameter
11751 name used later in a function declaration (such as in a
11752 late-specified return type). Even if it exists, it might
11753 have the wrong value for a recursive call. */
11754 need_local_specializations
= true;
11758 /* This parameter pack was used in an unevaluated context. Just
11759 make a dummy decl, since it's only used for its type. */
11760 ++cp_unevaluated_operand
;
11761 arg_pack
= tsubst_decl (parm_pack
, args
, complain
);
11762 --cp_unevaluated_operand
;
11763 if (arg_pack
&& DECL_PACK_P (arg_pack
))
11764 /* Partial instantiation of the parm_pack, we can't build
11765 up an argument pack yet. */
11766 arg_pack
= NULL_TREE
;
11768 arg_pack
= make_fnparm_pack (arg_pack
);
11770 else if (argument_pack_element_is_expansion_p (arg_pack
, 0))
11771 /* This argument pack isn't fully instantiated yet. We set this
11772 flag rather than clear arg_pack because we do want to do the
11773 optimization below, and we don't want to substitute directly
11774 into the pattern (as that would expose a NONTYPE_ARGUMENT_PACK
11775 where it isn't expected). */
11776 unsubstituted_fn_pack
= true;
11778 else if (is_normal_capture_proxy (parm_pack
))
11780 arg_pack
= retrieve_local_specialization (parm_pack
);
11781 if (argument_pack_element_is_expansion_p (arg_pack
, 0))
11782 unsubstituted_fn_pack
= true;
11787 template_parm_level_and_index (parm_pack
, &level
, &idx
);
11789 if (level
<= levels
)
11790 arg_pack
= TMPL_ARG (args
, level
, idx
);
11793 orig_arg
= arg_pack
;
11794 if (arg_pack
&& TREE_CODE (arg_pack
) == ARGUMENT_PACK_SELECT
)
11795 arg_pack
= ARGUMENT_PACK_SELECT_FROM_PACK (arg_pack
);
11797 if (arg_pack
&& !ARGUMENT_PACK_P (arg_pack
))
11798 /* This can only happen if we forget to expand an argument
11799 pack somewhere else. Just return an error, silently. */
11801 result
= make_tree_vec (1);
11802 TREE_VEC_ELT (result
, 0) = error_mark_node
;
11809 TREE_VEC_LENGTH (ARGUMENT_PACK_ARGS (arg_pack
));
11811 /* Don't bother trying to do a partial substitution with
11812 incomplete packs; we'll try again after deduction. */
11813 if (ARGUMENT_PACK_INCOMPLETE_P (arg_pack
))
11818 else if (len
!= my_len
11819 && !unsubstituted_fn_pack
)
11821 if (!(complain
& tf_error
))
11822 /* Fail quietly. */;
11823 else if (TREE_CODE (t
) == TYPE_PACK_EXPANSION
)
11824 error ("mismatched argument pack lengths while expanding %qT",
11827 error ("mismatched argument pack lengths while expanding %qE",
11829 return error_mark_node
;
11832 /* Keep track of the parameter packs and their corresponding
11834 packs
= tree_cons (parm_pack
, arg_pack
, packs
);
11835 TREE_TYPE (packs
) = orig_arg
;
11839 /* We can't substitute for this parameter pack. We use a flag as
11840 well as the missing_level counter because function parameter
11841 packs don't have a level. */
11842 gcc_assert (processing_template_decl
);
11843 unsubstituted_packs
= true;
11847 /* If the expansion is just T..., return the matching argument pack, unless
11848 we need to call convert_from_reference on all the elements. This is an
11849 important optimization; see c++/68422. */
11850 if (!unsubstituted_packs
11851 && TREE_PURPOSE (packs
) == pattern
)
11853 tree args
= ARGUMENT_PACK_ARGS (TREE_VALUE (packs
));
11855 /* If the argument pack is a single pack expansion, pull it out. */
11856 if (TREE_VEC_LENGTH (args
) == 1
11857 && pack_expansion_args_count (args
))
11858 return TREE_VEC_ELT (args
, 0);
11860 /* Types need no adjustment, nor does sizeof..., and if we still have
11861 some pack expansion args we won't do anything yet. */
11862 if (TREE_CODE (t
) == TYPE_PACK_EXPANSION
11863 || PACK_EXPANSION_SIZEOF_P (t
)
11864 || pack_expansion_args_count (args
))
11866 /* Also optimize expression pack expansions if we can tell that the
11867 elements won't have reference type. */
11868 tree type
= TREE_TYPE (pattern
);
11869 if (type
&& TREE_CODE (type
) != REFERENCE_TYPE
11870 && !PACK_EXPANSION_P (type
)
11871 && !WILDCARD_TYPE_P (type
))
11873 /* Otherwise use the normal path so we get convert_from_reference. */
11876 /* We cannot expand this expansion expression, because we don't have
11877 all of the argument packs we need. */
11878 if (use_pack_expansion_extra_args_p (packs
, len
, unsubstituted_packs
))
11880 /* We got some full packs, but we can't substitute them in until we
11881 have values for all the packs. So remember these until then. */
11883 t
= make_pack_expansion (pattern
, complain
);
11885 if (local_specializations
)
11886 if (tree locals
= extract_local_specs (pattern
, complain
))
11887 extra
= tree_cons (NULL_TREE
, extra
, locals
);
11888 PACK_EXPANSION_EXTRA_ARGS (t
) = extra
;
11891 else if (unsubstituted_packs
)
11893 /* There were no real arguments, we're just replacing a parameter
11894 pack with another version of itself. Substitute into the
11895 pattern and return a PACK_EXPANSION_*. The caller will need to
11897 if (TREE_CODE (t
) == EXPR_PACK_EXPANSION
)
11898 t
= tsubst_expr (pattern
, args
, complain
, in_decl
,
11899 /*integral_constant_expression_p=*/false);
11901 t
= tsubst (pattern
, args
, complain
, in_decl
);
11902 t
= make_pack_expansion (t
, complain
);
11906 gcc_assert (len
>= 0);
11908 if (need_local_specializations
)
11910 /* We're in a late-specified return type, so create our own local
11911 specializations map; the current map is either NULL or (in the
11912 case of recursive unification) might have bindings that we don't
11913 want to use or alter. */
11914 saved_local_specializations
= local_specializations
;
11915 local_specializations
= new hash_map
<tree
, tree
>;
11918 /* For each argument in each argument pack, substitute into the
11920 result
= make_tree_vec (len
);
11921 tree elem_args
= copy_template_args (args
);
11922 for (i
= 0; i
< len
; ++i
)
11924 t
= gen_elem_of_pack_expansion_instantiation (pattern
, packs
,
11926 elem_args
, complain
,
11928 TREE_VEC_ELT (result
, i
) = t
;
11929 if (t
== error_mark_node
)
11931 result
= error_mark_node
;
11936 /* Update ARGS to restore the substitution from parameter packs to
11937 their argument packs. */
11938 for (pack
= packs
; pack
; pack
= TREE_CHAIN (pack
))
11940 tree parm
= TREE_PURPOSE (pack
);
11942 if (TREE_CODE (parm
) == PARM_DECL
11944 || TREE_CODE (parm
) == FIELD_DECL
)
11945 register_local_specialization (TREE_TYPE (pack
), parm
);
11950 if (TREE_VALUE (pack
) == NULL_TREE
)
11953 template_parm_level_and_index (parm
, &level
, &idx
);
11955 /* Update the corresponding argument. */
11956 if (TMPL_ARGS_HAVE_MULTIPLE_LEVELS (args
))
11957 TREE_VEC_ELT (TREE_VEC_ELT (args
, level
-1 ), idx
) =
11960 TREE_VEC_ELT (args
, idx
) = TREE_TYPE (pack
);
11964 if (need_local_specializations
)
11966 delete local_specializations
;
11967 local_specializations
= saved_local_specializations
;
11970 /* If the dependent pack arguments were such that we end up with only a
11971 single pack expansion again, there's no need to keep it in a TREE_VEC. */
11972 if (len
== 1 && TREE_CODE (result
) == TREE_VEC
11973 && PACK_EXPANSION_P (TREE_VEC_ELT (result
, 0)))
11974 return TREE_VEC_ELT (result
, 0);
11979 /* Given PARM_DECL PARM, find the corresponding PARM_DECL in the template
11980 TMPL. We do this using DECL_PARM_INDEX, which should work even with
11981 parameter packs; all parms generated from a function parameter pack will
11982 have the same DECL_PARM_INDEX. */
11985 get_pattern_parm (tree parm
, tree tmpl
)
11987 tree pattern
= DECL_TEMPLATE_RESULT (tmpl
);
11990 if (DECL_ARTIFICIAL (parm
))
11992 for (patparm
= DECL_ARGUMENTS (pattern
);
11993 patparm
; patparm
= DECL_CHAIN (patparm
))
11994 if (DECL_ARTIFICIAL (patparm
)
11995 && DECL_NAME (parm
) == DECL_NAME (patparm
))
12000 patparm
= FUNCTION_FIRST_USER_PARM (DECL_TEMPLATE_RESULT (tmpl
));
12001 patparm
= chain_index (DECL_PARM_INDEX (parm
)-1, patparm
);
12002 gcc_assert (DECL_PARM_INDEX (patparm
)
12003 == DECL_PARM_INDEX (parm
));
12009 /* Make an argument pack out of the TREE_VEC VEC. */
12012 make_argument_pack (tree vec
)
12015 tree elt
= TREE_VEC_ELT (vec
, 0);
12017 pack
= cxx_make_type (TYPE_ARGUMENT_PACK
);
12020 pack
= make_node (NONTYPE_ARGUMENT_PACK
);
12021 TREE_CONSTANT (pack
) = 1;
12023 SET_ARGUMENT_PACK_ARGS (pack
, vec
);
12027 /* Return an exact copy of template args T that can be modified
12031 copy_template_args (tree t
)
12033 if (t
== error_mark_node
)
12036 int len
= TREE_VEC_LENGTH (t
);
12037 tree new_vec
= make_tree_vec (len
);
12039 for (int i
= 0; i
< len
; ++i
)
12041 tree elt
= TREE_VEC_ELT (t
, i
);
12042 if (elt
&& TREE_CODE (elt
) == TREE_VEC
)
12043 elt
= copy_template_args (elt
);
12044 TREE_VEC_ELT (new_vec
, i
) = elt
;
12047 NON_DEFAULT_TEMPLATE_ARGS_COUNT (new_vec
)
12048 = NON_DEFAULT_TEMPLATE_ARGS_COUNT (t
);
12053 /* Substitute ARGS into the vector or list of template arguments T. */
12056 tsubst_template_args (tree t
, tree args
, tsubst_flags_t complain
, tree in_decl
)
12059 int len
, need_new
= 0, i
, expanded_len_adjust
= 0, out
;
12062 if (t
== error_mark_node
)
12063 return error_mark_node
;
12065 len
= TREE_VEC_LENGTH (t
);
12066 elts
= XALLOCAVEC (tree
, len
);
12068 for (i
= 0; i
< len
; i
++)
12070 tree orig_arg
= TREE_VEC_ELT (t
, i
);
12073 if (TREE_CODE (orig_arg
) == TREE_VEC
)
12074 new_arg
= tsubst_template_args (orig_arg
, args
, complain
, in_decl
);
12075 else if (PACK_EXPANSION_P (orig_arg
))
12077 /* Substitute into an expansion expression. */
12078 new_arg
= tsubst_pack_expansion (orig_arg
, args
, complain
, in_decl
);
12080 if (TREE_CODE (new_arg
) == TREE_VEC
)
12081 /* Add to the expanded length adjustment the number of
12082 expanded arguments. We subtract one from this
12083 measurement, because the argument pack expression
12084 itself is already counted as 1 in
12085 LEN. EXPANDED_LEN_ADJUST can actually be negative, if
12086 the argument pack is empty. */
12087 expanded_len_adjust
+= TREE_VEC_LENGTH (new_arg
) - 1;
12089 else if (ARGUMENT_PACK_P (orig_arg
))
12091 /* Substitute into each of the arguments. */
12092 new_arg
= TYPE_P (orig_arg
)
12093 ? cxx_make_type (TREE_CODE (orig_arg
))
12094 : make_node (TREE_CODE (orig_arg
));
12096 tree pack_args
= tsubst_template_args (ARGUMENT_PACK_ARGS (orig_arg
),
12097 args
, complain
, in_decl
);
12098 if (pack_args
== error_mark_node
)
12099 new_arg
= error_mark_node
;
12101 SET_ARGUMENT_PACK_ARGS (new_arg
, pack_args
);
12103 if (TREE_CODE (new_arg
) == NONTYPE_ARGUMENT_PACK
)
12104 TREE_CONSTANT (new_arg
) = TREE_CONSTANT (orig_arg
);
12107 new_arg
= tsubst_template_arg (orig_arg
, args
, complain
, in_decl
);
12109 if (new_arg
== error_mark_node
)
12110 return error_mark_node
;
12113 if (new_arg
!= orig_arg
)
12120 /* Make space for the expanded arguments coming from template
12122 t
= make_tree_vec (len
+ expanded_len_adjust
);
12123 /* ORIG_T can contain TREE_VECs. That happens if ORIG_T contains the
12124 arguments for a member template.
12125 In that case each TREE_VEC in ORIG_T represents a level of template
12126 arguments, and ORIG_T won't carry any non defaulted argument count.
12127 It will rather be the nested TREE_VECs that will carry one.
12128 In other words, ORIG_T carries a non defaulted argument count only
12129 if it doesn't contain any nested TREE_VEC. */
12130 if (NON_DEFAULT_TEMPLATE_ARGS_COUNT (orig_t
))
12132 int count
= GET_NON_DEFAULT_TEMPLATE_ARGS_COUNT (orig_t
);
12133 count
+= expanded_len_adjust
;
12134 SET_NON_DEFAULT_TEMPLATE_ARGS_COUNT (t
, count
);
12136 for (i
= 0, out
= 0; i
< len
; i
++)
12138 if ((PACK_EXPANSION_P (TREE_VEC_ELT (orig_t
, i
))
12139 || ARGUMENT_PACK_P (TREE_VEC_ELT (orig_t
, i
)))
12140 && TREE_CODE (elts
[i
]) == TREE_VEC
)
12144 /* Now expand the template argument pack "in place". */
12145 for (idx
= 0; idx
< TREE_VEC_LENGTH (elts
[i
]); idx
++, out
++)
12146 TREE_VEC_ELT (t
, out
) = TREE_VEC_ELT (elts
[i
], idx
);
12150 TREE_VEC_ELT (t
, out
) = elts
[i
];
12158 /* Substitute ARGS into one level PARMS of template parameters. */
12161 tsubst_template_parms_level (tree parms
, tree args
, tsubst_flags_t complain
)
12163 if (parms
== error_mark_node
)
12164 return error_mark_node
;
12166 tree new_vec
= make_tree_vec (TREE_VEC_LENGTH (parms
));
12168 for (int i
= 0; i
< TREE_VEC_LENGTH (new_vec
); ++i
)
12170 tree tuple
= TREE_VEC_ELT (parms
, i
);
12172 if (tuple
== error_mark_node
)
12175 TREE_VEC_ELT (new_vec
, i
) =
12176 tsubst_template_parm (tuple
, args
, complain
);
12182 /* Return the result of substituting ARGS into the template parameters
12183 given by PARMS. If there are m levels of ARGS and m + n levels of
12184 PARMS, then the result will contain n levels of PARMS. For
12185 example, if PARMS is `template <class T> template <class U>
12186 template <T*, U, class V>' and ARGS is {{int}, {double}} then the
12187 result will be `template <int*, double, class V>'. */
12190 tsubst_template_parms (tree parms
, tree args
, tsubst_flags_t complain
)
12192 tree r
= NULL_TREE
;
12195 /* When substituting into a template, we must set
12196 PROCESSING_TEMPLATE_DECL as the template parameters may be
12197 dependent if they are based on one-another, and the dependency
12198 predicates are short-circuit outside of templates. */
12199 ++processing_template_decl
;
12201 for (new_parms
= &r
;
12202 parms
&& TMPL_PARMS_DEPTH (parms
) > TMPL_ARGS_DEPTH (args
);
12203 new_parms
= &(TREE_CHAIN (*new_parms
)),
12204 parms
= TREE_CHAIN (parms
))
12206 tree new_vec
= tsubst_template_parms_level (TREE_VALUE (parms
),
12209 tree_cons (size_int (TMPL_PARMS_DEPTH (parms
)
12210 - TMPL_ARGS_DEPTH (args
)),
12211 new_vec
, NULL_TREE
);
12214 --processing_template_decl
;
12219 /* Return the result of substituting ARGS into one template parameter
12220 given by T. T Must be a TREE_LIST which TREE_VALUE is the template
12221 parameter and which TREE_PURPOSE is the default argument of the
12222 template parameter. */
12225 tsubst_template_parm (tree t
, tree args
, tsubst_flags_t complain
)
12227 tree default_value
, parm_decl
;
12229 if (args
== NULL_TREE
12231 || t
== error_mark_node
)
12234 gcc_assert (TREE_CODE (t
) == TREE_LIST
);
12236 default_value
= TREE_PURPOSE (t
);
12237 parm_decl
= TREE_VALUE (t
);
12239 parm_decl
= tsubst (parm_decl
, args
, complain
, NULL_TREE
);
12240 if (TREE_CODE (parm_decl
) == PARM_DECL
12241 && invalid_nontype_parm_type_p (TREE_TYPE (parm_decl
), complain
))
12242 parm_decl
= error_mark_node
;
12243 default_value
= tsubst_template_arg (default_value
, args
,
12244 complain
, NULL_TREE
);
12246 return build_tree_list (default_value
, parm_decl
);
12249 /* Substitute the ARGS into the indicated aggregate (or enumeration)
12250 type T. If T is not an aggregate or enumeration type, it is
12251 handled as if by tsubst. IN_DECL is as for tsubst. If
12252 ENTERING_SCOPE is nonzero, T is the context for a template which
12253 we are presently tsubst'ing. Return the substituted value. */
12256 tsubst_aggr_type (tree t
,
12258 tsubst_flags_t complain
,
12260 int entering_scope
)
12262 if (t
== NULL_TREE
)
12265 switch (TREE_CODE (t
))
12268 if (TYPE_PTRMEMFUNC_P (t
))
12269 return tsubst (TYPE_PTRMEMFUNC_FN_TYPE (t
), args
, complain
, in_decl
);
12271 /* Fall through. */
12272 case ENUMERAL_TYPE
:
12274 if (TYPE_TEMPLATE_INFO (t
) && uses_template_parms (t
))
12279 int saved_unevaluated_operand
;
12280 int saved_inhibit_evaluation_warnings
;
12282 /* In "sizeof(X<I>)" we need to evaluate "I". */
12283 saved_unevaluated_operand
= cp_unevaluated_operand
;
12284 cp_unevaluated_operand
= 0;
12285 saved_inhibit_evaluation_warnings
= c_inhibit_evaluation_warnings
;
12286 c_inhibit_evaluation_warnings
= 0;
12288 /* First, determine the context for the type we are looking
12290 context
= TYPE_CONTEXT (t
);
12291 if (context
&& TYPE_P (context
))
12293 context
= tsubst_aggr_type (context
, args
, complain
,
12294 in_decl
, /*entering_scope=*/1);
12295 /* If context is a nested class inside a class template,
12296 it may still need to be instantiated (c++/33959). */
12297 context
= complete_type (context
);
12300 /* Then, figure out what arguments are appropriate for the
12301 type we are trying to find. For example, given:
12303 template <class T> struct S;
12304 template <class T, class U> void f(T, U) { S<U> su; }
12306 and supposing that we are instantiating f<int, double>,
12307 then our ARGS will be {int, double}, but, when looking up
12308 S we only want {double}. */
12309 argvec
= tsubst_template_args (TYPE_TI_ARGS (t
), args
,
12310 complain
, in_decl
);
12311 if (argvec
== error_mark_node
)
12312 r
= error_mark_node
;
12315 r
= lookup_template_class (t
, argvec
, in_decl
, context
,
12316 entering_scope
, complain
);
12317 r
= cp_build_qualified_type_real (r
, cp_type_quals (t
), complain
);
12320 cp_unevaluated_operand
= saved_unevaluated_operand
;
12321 c_inhibit_evaluation_warnings
= saved_inhibit_evaluation_warnings
;
12326 /* This is not a template type, so there's nothing to do. */
12330 return tsubst (t
, args
, complain
, in_decl
);
12334 static GTY((cache
)) tree_cache_map
*defarg_inst
;
12336 /* Substitute into the default argument ARG (a default argument for
12337 FN), which has the indicated TYPE. */
12340 tsubst_default_argument (tree fn
, int parmnum
, tree type
, tree arg
,
12341 tsubst_flags_t complain
)
12343 tree saved_class_ptr
= NULL_TREE
;
12344 tree saved_class_ref
= NULL_TREE
;
12345 int errs
= errorcount
+ sorrycount
;
12347 /* This can happen in invalid code. */
12348 if (TREE_CODE (arg
) == DEFAULT_ARG
)
12351 tree parm
= FUNCTION_FIRST_USER_PARM (fn
);
12352 parm
= chain_index (parmnum
, parm
);
12353 tree parmtype
= TREE_TYPE (parm
);
12354 if (DECL_BY_REFERENCE (parm
))
12355 parmtype
= TREE_TYPE (parmtype
);
12356 if (parmtype
== error_mark_node
)
12357 return error_mark_node
;
12359 gcc_assert (same_type_ignoring_top_level_qualifiers_p (type
, parmtype
));
12362 if (defarg_inst
&& (slot
= defarg_inst
->get (parm
)))
12365 /* This default argument came from a template. Instantiate the
12366 default argument here, not in tsubst. In the case of
12375 we must be careful to do name lookup in the scope of S<T>,
12376 rather than in the current class. */
12377 push_access_scope (fn
);
12378 /* The "this" pointer is not valid in a default argument. */
12381 saved_class_ptr
= current_class_ptr
;
12382 cp_function_chain
->x_current_class_ptr
= NULL_TREE
;
12383 saved_class_ref
= current_class_ref
;
12384 cp_function_chain
->x_current_class_ref
= NULL_TREE
;
12387 start_lambda_scope (parm
);
12389 push_deferring_access_checks(dk_no_deferred
);
12390 /* The default argument expression may cause implicitly defined
12391 member functions to be synthesized, which will result in garbage
12392 collection. We must treat this situation as if we were within
12393 the body of function so as to avoid collecting live data on the
12396 arg
= tsubst_expr (arg
, DECL_TI_ARGS (fn
),
12397 complain
, NULL_TREE
,
12398 /*integral_constant_expression_p=*/false);
12400 pop_deferring_access_checks();
12402 finish_lambda_scope ();
12404 /* Restore the "this" pointer. */
12407 cp_function_chain
->x_current_class_ptr
= saved_class_ptr
;
12408 cp_function_chain
->x_current_class_ref
= saved_class_ref
;
12411 if (errorcount
+sorrycount
> errs
12412 && (complain
& tf_warning_or_error
))
12413 inform (input_location
,
12414 " when instantiating default argument for call to %qD", fn
);
12416 /* Make sure the default argument is reasonable. */
12417 arg
= check_default_argument (type
, arg
, complain
);
12419 pop_access_scope (fn
);
12421 if (arg
!= error_mark_node
&& !cp_unevaluated_operand
)
12424 defarg_inst
= tree_cache_map::create_ggc (37);
12425 defarg_inst
->put (parm
, arg
);
12431 /* Substitute into all the default arguments for FN. */
12434 tsubst_default_arguments (tree fn
, tsubst_flags_t complain
)
12439 tmpl_args
= DECL_TI_ARGS (fn
);
12441 /* If this function is not yet instantiated, we certainly don't need
12442 its default arguments. */
12443 if (uses_template_parms (tmpl_args
))
12445 /* Don't do this again for clones. */
12446 if (DECL_CLONED_FUNCTION_P (fn
))
12450 for (arg
= TYPE_ARG_TYPES (TREE_TYPE (fn
));
12452 arg
= TREE_CHAIN (arg
), ++i
)
12453 if (TREE_PURPOSE (arg
))
12454 TREE_PURPOSE (arg
) = tsubst_default_argument (fn
, i
,
12456 TREE_PURPOSE (arg
),
12460 /* Subroutine of tsubst_decl for the case when T is a FUNCTION_DECL. */
12463 tsubst_function_decl (tree t
, tree args
, tsubst_flags_t complain
,
12464 tree lambda_fntype
)
12466 tree gen_tmpl
, argvec
;
12467 hashval_t hash
= 0;
12470 /* Nobody should be tsubst'ing into non-template functions. */
12471 gcc_assert (DECL_TEMPLATE_INFO (t
) != NULL_TREE
);
12473 if (TREE_CODE (DECL_TI_TEMPLATE (t
)) == TEMPLATE_DECL
)
12475 /* If T is not dependent, just return it. */
12476 if (!uses_template_parms (DECL_TI_ARGS (t
)))
12479 /* Calculate the most general template of which R is a
12481 gen_tmpl
= most_general_template (DECL_TI_TEMPLATE (t
));
12483 /* We're substituting a lambda function under tsubst_lambda_expr but not
12484 directly from it; find the matching function we're already inside.
12485 But don't do this if T is a generic lambda with a single level of
12486 template parms, as in that case we're doing a normal instantiation. */
12487 if (LAMBDA_FUNCTION_P (t
) && !lambda_fntype
12488 && (!generic_lambda_fn_p (t
)
12489 || TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (gen_tmpl
)) > 1))
12490 return enclosing_instantiation_of (t
);
12492 /* Calculate the complete set of arguments used to
12494 argvec
= tsubst_template_args (DECL_TI_ARGS
12495 (DECL_TEMPLATE_RESULT
12496 (DECL_TI_TEMPLATE (t
))),
12497 args
, complain
, in_decl
);
12498 if (argvec
== error_mark_node
)
12499 return error_mark_node
;
12501 /* Check to see if we already have this specialization. */
12502 if (!lambda_fntype
)
12504 hash
= hash_tmpl_and_args (gen_tmpl
, argvec
);
12505 if (tree spec
= retrieve_specialization (gen_tmpl
, argvec
, hash
))
12509 /* We can see more levels of arguments than parameters if
12510 there was a specialization of a member template, like
12513 template <class T> struct S { template <class U> void f(); }
12514 template <> template <class U> void S<int>::f(U);
12516 Here, we'll be substituting into the specialization,
12517 because that's where we can find the code we actually
12518 want to generate, but we'll have enough arguments for
12519 the most general template.
12521 We also deal with the peculiar case:
12523 template <class T> struct S {
12524 template <class U> friend void f();
12526 template <class U> void f() {}
12528 template void f<double>();
12530 Here, the ARGS for the instantiation of will be {int,
12531 double}. But, we only need as many ARGS as there are
12532 levels of template parameters in CODE_PATTERN. We are
12533 careful not to get fooled into reducing the ARGS in
12536 template <class T> struct S { template <class U> void f(U); }
12537 template <class T> template <> void S<T>::f(int) {}
12539 which we can spot because the pattern will be a
12540 specialization in this case. */
12541 int args_depth
= TMPL_ARGS_DEPTH (args
);
12543 TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (DECL_TI_TEMPLATE (t
)));
12545 if (args_depth
> parms_depth
&& !DECL_TEMPLATE_SPECIALIZATION (t
))
12546 args
= get_innermost_template_args (args
, parms_depth
);
12550 /* This special case arises when we have something like this:
12552 template <class T> struct S {
12553 friend void f<int>(int, double);
12556 Here, the DECL_TI_TEMPLATE for the friend declaration
12557 will be an IDENTIFIER_NODE. We are being called from
12558 tsubst_friend_function, and we want only to create a
12559 new decl (R) with appropriate types so that we can call
12560 determine_specialization. */
12561 gen_tmpl
= NULL_TREE
;
12562 argvec
= NULL_TREE
;
12565 tree closure
= (lambda_fntype
? TYPE_METHOD_BASETYPE (lambda_fntype
)
12567 tree ctx
= closure
? closure
: DECL_CONTEXT (t
);
12568 bool member
= ctx
&& TYPE_P (ctx
);
12570 if (member
&& !closure
)
12571 ctx
= tsubst_aggr_type (ctx
, args
,
12572 complain
, t
, /*entering_scope=*/1);
12574 tree type
= (lambda_fntype
? lambda_fntype
12575 : tsubst (TREE_TYPE (t
), args
,
12576 complain
| tf_fndecl_type
, in_decl
));
12577 if (type
== error_mark_node
)
12578 return error_mark_node
;
12580 /* If we hit excessive deduction depth, the type is bogus even if
12581 it isn't error_mark_node, so don't build a decl. */
12582 if (excessive_deduction_depth
)
12583 return error_mark_node
;
12585 /* We do NOT check for matching decls pushed separately at this
12586 point, as they may not represent instantiations of this
12587 template, and in any case are considered separate under the
12589 tree r
= copy_decl (t
);
12590 DECL_USE_TEMPLATE (r
) = 0;
12591 TREE_TYPE (r
) = type
;
12592 /* Clear out the mangled name and RTL for the instantiation. */
12593 SET_DECL_ASSEMBLER_NAME (r
, NULL_TREE
);
12594 SET_DECL_RTL (r
, NULL
);
12595 /* Leave DECL_INITIAL set on deleted instantiations. */
12596 if (!DECL_DELETED_FN (r
))
12597 DECL_INITIAL (r
) = NULL_TREE
;
12598 DECL_CONTEXT (r
) = ctx
;
12600 /* OpenMP UDRs have the only argument a reference to the declared
12601 type. We want to diagnose if the declared type is a reference,
12602 which is invalid, but as references to references are usually
12603 quietly merged, diagnose it here. */
12604 if (DECL_OMP_DECLARE_REDUCTION_P (t
))
12607 = TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (t
))));
12608 argtype
= tsubst (argtype
, args
, complain
, in_decl
);
12609 if (TREE_CODE (argtype
) == REFERENCE_TYPE
)
12610 error_at (DECL_SOURCE_LOCATION (t
),
12611 "reference type %qT in "
12612 "%<#pragma omp declare reduction%>", argtype
);
12613 if (strchr (IDENTIFIER_POINTER (DECL_NAME (t
)), '~') == NULL
)
12614 DECL_NAME (r
) = omp_reduction_id (ERROR_MARK
, DECL_NAME (t
),
12618 if (member
&& DECL_CONV_FN_P (r
))
12619 /* Type-conversion operator. Reconstruct the name, in
12620 case it's the name of one of the template's parameters. */
12621 DECL_NAME (r
) = make_conv_op_name (TREE_TYPE (type
));
12623 tree parms
= DECL_ARGUMENTS (t
);
12625 parms
= DECL_CHAIN (parms
);
12626 parms
= tsubst (parms
, args
, complain
, t
);
12627 for (tree parm
= parms
; parm
; parm
= DECL_CHAIN (parm
))
12628 DECL_CONTEXT (parm
) = r
;
12631 tree tparm
= build_this_parm (r
, closure
, type_memfn_quals (type
));
12632 DECL_CHAIN (tparm
) = parms
;
12635 DECL_ARGUMENTS (r
) = parms
;
12636 DECL_RESULT (r
) = NULL_TREE
;
12638 TREE_STATIC (r
) = 0;
12639 TREE_PUBLIC (r
) = TREE_PUBLIC (t
);
12640 DECL_EXTERNAL (r
) = 1;
12641 /* If this is an instantiation of a function with internal
12642 linkage, we already know what object file linkage will be
12643 assigned to the instantiation. */
12644 DECL_INTERFACE_KNOWN (r
) = !TREE_PUBLIC (r
);
12645 DECL_DEFER_OUTPUT (r
) = 0;
12646 DECL_CHAIN (r
) = NULL_TREE
;
12647 DECL_PENDING_INLINE_INFO (r
) = 0;
12648 DECL_PENDING_INLINE_P (r
) = 0;
12649 DECL_SAVED_TREE (r
) = NULL_TREE
;
12650 DECL_STRUCT_FUNCTION (r
) = NULL
;
12652 /* We'll re-clone as appropriate in instantiate_template. */
12653 DECL_CLONED_FUNCTION (r
) = NULL_TREE
;
12655 /* If we aren't complaining now, return on error before we register
12656 the specialization so that we'll complain eventually. */
12657 if ((complain
& tf_error
) == 0
12658 && IDENTIFIER_ANY_OP_P (DECL_NAME (r
))
12659 && !grok_op_properties (r
, /*complain=*/false))
12660 return error_mark_node
;
12662 /* When instantiating a constrained member, substitute
12663 into the constraints to create a new constraint. */
12664 if (tree ci
= get_constraints (t
))
12667 ci
= tsubst_constraint_info (ci
, argvec
, complain
, NULL_TREE
);
12668 set_constraints (r
, ci
);
12671 /* Set up the DECL_TEMPLATE_INFO for R. There's no need to do
12672 this in the special friend case mentioned above where
12673 GEN_TMPL is NULL. */
12674 if (gen_tmpl
&& !closure
)
12676 DECL_TEMPLATE_INFO (r
)
12677 = build_template_info (gen_tmpl
, argvec
);
12678 SET_DECL_IMPLICIT_INSTANTIATION (r
);
12681 = register_specialization (r
, gen_tmpl
, argvec
, false, hash
);
12683 /* We instantiated this while substituting into
12684 the type earlier (template/friend54.C). */
12687 /* We're not supposed to instantiate default arguments
12688 until they are called, for a template. But, for a
12691 template <class T> void f ()
12692 { extern void g(int i = T()); }
12694 we should do the substitution when the template is
12695 instantiated. We handle the member function case in
12696 instantiate_class_template since the default arguments
12697 might refer to other members of the class. */
12699 && !PRIMARY_TEMPLATE_P (gen_tmpl
)
12700 && !uses_template_parms (argvec
))
12701 tsubst_default_arguments (r
, complain
);
12704 DECL_TEMPLATE_INFO (r
) = NULL_TREE
;
12706 /* Copy the list of befriending classes. */
12707 for (tree
*friends
= &DECL_BEFRIENDING_CLASSES (r
);
12709 friends
= &TREE_CHAIN (*friends
))
12711 *friends
= copy_node (*friends
);
12712 TREE_VALUE (*friends
)
12713 = tsubst (TREE_VALUE (*friends
), args
, complain
, in_decl
);
12716 if (DECL_CONSTRUCTOR_P (r
) || DECL_DESTRUCTOR_P (r
))
12718 maybe_retrofit_in_chrg (r
);
12719 if (DECL_CONSTRUCTOR_P (r
) && !grok_ctor_properties (ctx
, r
))
12720 return error_mark_node
;
12721 /* If this is an instantiation of a member template, clone it.
12722 If it isn't, that'll be handled by
12723 clone_constructors_and_destructors. */
12724 if (PRIMARY_TEMPLATE_P (gen_tmpl
))
12725 clone_function_decl (r
, /*update_methods=*/false);
12727 else if ((complain
& tf_error
) != 0
12728 && IDENTIFIER_ANY_OP_P (DECL_NAME (r
))
12729 && !grok_op_properties (r
, /*complain=*/true))
12730 return error_mark_node
;
12732 if (DECL_FRIEND_P (t
) && DECL_FRIEND_CONTEXT (t
))
12733 SET_DECL_FRIEND_CONTEXT (r
,
12734 tsubst (DECL_FRIEND_CONTEXT (t
),
12735 args
, complain
, in_decl
));
12737 /* Possibly limit visibility based on template args. */
12738 DECL_VISIBILITY (r
) = VISIBILITY_DEFAULT
;
12739 if (DECL_VISIBILITY_SPECIFIED (t
))
12741 DECL_VISIBILITY_SPECIFIED (r
) = 0;
12742 DECL_ATTRIBUTES (r
)
12743 = remove_attribute ("visibility", DECL_ATTRIBUTES (r
));
12745 determine_visibility (r
);
12746 if (DECL_DEFAULTED_OUTSIDE_CLASS_P (r
)
12747 && !processing_template_decl
)
12748 defaulted_late_check (r
);
12750 apply_late_template_attributes (&r
, DECL_ATTRIBUTES (r
), 0,
12751 args
, complain
, in_decl
);
12755 /* Subroutine of tsubst_decl for the case when T is a TEMPLATE_DECL. */
12758 tsubst_template_decl (tree t
, tree args
, tsubst_flags_t complain
,
12759 tree lambda_fntype
)
12761 /* We can get here when processing a member function template,
12762 member class template, or template template parameter. */
12763 tree decl
= DECL_TEMPLATE_RESULT (t
);
12769 hashval_t hash
= 0;
12771 if (DECL_TEMPLATE_TEMPLATE_PARM_P (t
))
12773 /* Template template parameter is treated here. */
12774 tree new_type
= tsubst (TREE_TYPE (t
), args
, complain
, in_decl
);
12775 if (new_type
== error_mark_node
)
12776 r
= error_mark_node
;
12777 /* If we get a real template back, return it. This can happen in
12778 the context of most_specialized_partial_spec. */
12779 else if (TREE_CODE (new_type
) == TEMPLATE_DECL
)
12782 /* The new TEMPLATE_DECL was built in
12783 reduce_template_parm_level. */
12784 r
= TEMPLATE_TEMPLATE_PARM_TEMPLATE_DECL (new_type
);
12788 if (!lambda_fntype
)
12790 /* We might already have an instance of this template.
12791 The ARGS are for the surrounding class type, so the
12792 full args contain the tsubst'd args for the context,
12793 plus the innermost args from the template decl. */
12794 tmpl_args
= DECL_CLASS_TEMPLATE_P (t
)
12795 ? CLASSTYPE_TI_ARGS (TREE_TYPE (t
))
12796 : DECL_TI_ARGS (DECL_TEMPLATE_RESULT (t
));
12797 /* Because this is a template, the arguments will still be
12798 dependent, even after substitution. If
12799 PROCESSING_TEMPLATE_DECL is not set, the dependency
12800 predicates will short-circuit. */
12801 ++processing_template_decl
;
12802 full_args
= tsubst_template_args (tmpl_args
, args
,
12803 complain
, in_decl
);
12804 --processing_template_decl
;
12805 if (full_args
== error_mark_node
)
12806 return error_mark_node
;
12808 /* If this is a default template template argument,
12809 tsubst might not have changed anything. */
12810 if (full_args
== tmpl_args
)
12813 hash
= hash_tmpl_and_args (t
, full_args
);
12814 spec
= retrieve_specialization (t
, full_args
, hash
);
12815 if (spec
!= NULL_TREE
)
12819 /* Make a new template decl. It will be similar to the
12820 original, but will record the current template arguments.
12821 We also create a new function declaration, which is just
12822 like the old one, but points to this new template, rather
12823 than the old one. */
12825 gcc_assert (DECL_LANG_SPECIFIC (r
) != 0);
12826 DECL_CHAIN (r
) = NULL_TREE
;
12828 // Build new template info linking to the original template decl.
12829 if (!lambda_fntype
)
12831 DECL_TEMPLATE_INFO (r
) = build_template_info (t
, args
);
12832 SET_DECL_IMPLICIT_INSTANTIATION (r
);
12835 DECL_TEMPLATE_INFO (r
) = NULL_TREE
;
12837 /* The template parameters for this new template are all the
12838 template parameters for the old template, except the
12839 outermost level of parameters. */
12840 DECL_TEMPLATE_PARMS (r
)
12841 = tsubst_template_parms (DECL_TEMPLATE_PARMS (t
), args
,
12844 if (TREE_CODE (decl
) == TYPE_DECL
12845 && !TYPE_DECL_ALIAS_P (decl
))
12848 ++processing_template_decl
;
12849 new_type
= tsubst (TREE_TYPE (t
), args
, complain
, in_decl
);
12850 --processing_template_decl
;
12851 if (new_type
== error_mark_node
)
12852 return error_mark_node
;
12854 TREE_TYPE (r
) = new_type
;
12855 /* For a partial specialization, we need to keep pointing to
12856 the primary template. */
12857 if (!DECL_TEMPLATE_SPECIALIZATION (t
))
12858 CLASSTYPE_TI_TEMPLATE (new_type
) = r
;
12859 DECL_TEMPLATE_RESULT (r
) = TYPE_MAIN_DECL (new_type
);
12860 DECL_TI_ARGS (r
) = CLASSTYPE_TI_ARGS (new_type
);
12861 DECL_CONTEXT (r
) = TYPE_CONTEXT (new_type
);
12866 ++processing_template_decl
;
12867 if (TREE_CODE (decl
) == FUNCTION_DECL
)
12868 new_decl
= tsubst_function_decl (decl
, args
, complain
, lambda_fntype
);
12870 new_decl
= tsubst (decl
, args
, complain
, in_decl
);
12871 --processing_template_decl
;
12872 if (new_decl
== error_mark_node
)
12873 return error_mark_node
;
12875 DECL_TEMPLATE_RESULT (r
) = new_decl
;
12876 TREE_TYPE (r
) = TREE_TYPE (new_decl
);
12877 DECL_CONTEXT (r
) = DECL_CONTEXT (new_decl
);
12880 tree args
= template_parms_to_args (DECL_TEMPLATE_PARMS (r
));
12881 DECL_TEMPLATE_INFO (new_decl
) = build_template_info (r
, args
);
12885 DECL_TI_TEMPLATE (new_decl
) = r
;
12886 DECL_TI_ARGS (r
) = DECL_TI_ARGS (new_decl
);
12890 DECL_TEMPLATE_INSTANTIATIONS (r
) = NULL_TREE
;
12891 DECL_TEMPLATE_SPECIALIZATIONS (r
) = NULL_TREE
;
12893 if (PRIMARY_TEMPLATE_P (t
))
12894 DECL_PRIMARY_TEMPLATE (r
) = r
;
12896 if (TREE_CODE (decl
) != TYPE_DECL
&& !VAR_P (decl
)
12898 /* Record this non-type partial instantiation. */
12899 register_specialization (r
, t
,
12900 DECL_TI_ARGS (DECL_TEMPLATE_RESULT (r
)),
12906 /* True if FN is the op() for a lambda in an uninstantiated template. */
12909 lambda_fn_in_template_p (tree fn
)
12911 if (!fn
|| !LAMBDA_FUNCTION_P (fn
))
12913 tree closure
= DECL_CONTEXT (fn
);
12914 return CLASSTYPE_TEMPLATE_INFO (closure
) != NULL_TREE
;
12917 /* We're instantiating a variable from template function TCTX. Return the
12918 corresponding current enclosing scope. This gets complicated because lambda
12919 functions in templates are regenerated rather than instantiated, but generic
12920 lambda functions are subsequently instantiated. */
12923 enclosing_instantiation_of (tree otctx
)
12926 tree fn
= current_function_decl
;
12927 int lambda_count
= 0;
12929 for (; tctx
&& lambda_fn_in_template_p (tctx
);
12930 tctx
= decl_function_context (tctx
))
12932 for (; fn
; fn
= decl_function_context (fn
))
12935 int flambda_count
= 0;
12936 for (; flambda_count
< lambda_count
&& fn
&& LAMBDA_FUNCTION_P (fn
);
12937 fn
= decl_function_context (fn
))
12939 if ((fn
&& DECL_TEMPLATE_INFO (fn
))
12940 ? most_general_template (fn
) != most_general_template (tctx
)
12943 gcc_assert (DECL_NAME (ofn
) == DECL_NAME (otctx
)
12944 || DECL_CONV_FN_P (ofn
));
12947 gcc_unreachable ();
12950 /* Substitute the ARGS into the T, which is a _DECL. Return the
12951 result of the substitution. Issue error and warning messages under
12952 control of COMPLAIN. */
12955 tsubst_decl (tree t
, tree args
, tsubst_flags_t complain
)
12957 #define RETURN(EXP) do { r = (EXP); goto out; } while(0)
12958 location_t saved_loc
;
12959 tree r
= NULL_TREE
;
12961 hashval_t hash
= 0;
12963 /* Set the filename and linenumber to improve error-reporting. */
12964 saved_loc
= input_location
;
12965 input_location
= DECL_SOURCE_LOCATION (t
);
12967 switch (TREE_CODE (t
))
12969 case TEMPLATE_DECL
:
12970 r
= tsubst_template_decl (t
, args
, complain
, /*lambda*/NULL_TREE
);
12973 case FUNCTION_DECL
:
12974 r
= tsubst_function_decl (t
, args
, complain
, /*lambda*/NULL_TREE
);
12979 tree type
= NULL_TREE
;
12981 tree expanded_types
= NULL_TREE
;
12982 tree prev_r
= NULL_TREE
;
12983 tree first_r
= NULL_TREE
;
12985 if (DECL_PACK_P (t
))
12987 /* If there is a local specialization that isn't a
12988 parameter pack, it means that we're doing a "simple"
12989 substitution from inside tsubst_pack_expansion. Just
12990 return the local specialization (which will be a single
12992 tree spec
= retrieve_local_specialization (t
);
12994 && TREE_CODE (spec
) == PARM_DECL
12995 && TREE_CODE (TREE_TYPE (spec
)) != TYPE_PACK_EXPANSION
)
12998 /* Expand the TYPE_PACK_EXPANSION that provides the types for
12999 the parameters in this function parameter pack. */
13000 expanded_types
= tsubst_pack_expansion (TREE_TYPE (t
), args
,
13001 complain
, in_decl
);
13002 if (TREE_CODE (expanded_types
) == TREE_VEC
)
13004 len
= TREE_VEC_LENGTH (expanded_types
);
13006 /* Zero-length parameter packs are boring. Just substitute
13009 RETURN (tsubst (TREE_CHAIN (t
), args
, complain
,
13014 /* All we did was update the type. Make a note of that. */
13015 type
= expanded_types
;
13016 expanded_types
= NULL_TREE
;
13020 /* Loop through all of the parameters we'll build. When T is
13021 a function parameter pack, LEN is the number of expanded
13022 types in EXPANDED_TYPES; otherwise, LEN is 1. */
13024 for (i
= 0; i
< len
; ++i
)
13028 if (DECL_TEMPLATE_PARM_P (t
))
13029 SET_DECL_TEMPLATE_PARM_P (r
);
13031 if (expanded_types
)
13032 /* We're on the Ith parameter of the function parameter
13035 /* Get the Ith type. */
13036 type
= TREE_VEC_ELT (expanded_types
, i
);
13038 /* Rename the parameter to include the index. */
13040 = make_ith_pack_parameter_name (DECL_NAME (r
), i
);
13043 /* We're dealing with a normal parameter. */
13044 type
= tsubst (TREE_TYPE (t
), args
, complain
, in_decl
);
13046 type
= type_decays_to (type
);
13047 TREE_TYPE (r
) = type
;
13048 cp_apply_type_quals_to_decl (cp_type_quals (type
), r
);
13050 if (DECL_INITIAL (r
))
13052 if (TREE_CODE (DECL_INITIAL (r
)) != TEMPLATE_PARM_INDEX
)
13053 DECL_INITIAL (r
) = TREE_TYPE (r
);
13055 DECL_INITIAL (r
) = tsubst (DECL_INITIAL (r
), args
,
13056 complain
, in_decl
);
13059 DECL_CONTEXT (r
) = NULL_TREE
;
13061 if (!DECL_TEMPLATE_PARM_P (r
))
13062 DECL_ARG_TYPE (r
) = type_passed_as (type
);
13064 apply_late_template_attributes (&r
, DECL_ATTRIBUTES (r
), 0,
13065 args
, complain
, in_decl
);
13067 /* Keep track of the first new parameter we
13068 generate. That's what will be returned to the
13073 /* Build a proper chain of parameters when substituting
13074 into a function parameter pack. */
13076 DECL_CHAIN (prev_r
) = r
;
13079 /* If cp_unevaluated_operand is set, we're just looking for a
13080 single dummy parameter, so don't keep going. */
13081 if (DECL_CHAIN (t
) && !cp_unevaluated_operand
)
13082 DECL_CHAIN (r
) = tsubst (DECL_CHAIN (t
), args
,
13083 complain
, DECL_CHAIN (t
));
13085 /* FIRST_R contains the start of the chain we've built. */
13092 tree type
= NULL_TREE
;
13093 tree vec
= NULL_TREE
;
13094 tree expanded_types
= NULL_TREE
;
13097 if (PACK_EXPANSION_P (TREE_TYPE (t
)))
13099 /* This field is a lambda capture pack. Return a TREE_VEC of
13100 the expanded fields to instantiate_class_template_1. */
13101 expanded_types
= tsubst_pack_expansion (TREE_TYPE (t
), args
,
13102 complain
, in_decl
);
13103 if (TREE_CODE (expanded_types
) == TREE_VEC
)
13105 len
= TREE_VEC_LENGTH (expanded_types
);
13106 vec
= make_tree_vec (len
);
13110 /* All we did was update the type. Make a note of that. */
13111 type
= expanded_types
;
13112 expanded_types
= NULL_TREE
;
13116 for (int i
= 0; i
< len
; ++i
)
13119 if (expanded_types
)
13121 type
= TREE_VEC_ELT (expanded_types
, i
);
13123 = make_ith_pack_parameter_name (DECL_NAME (r
), i
);
13126 type
= tsubst (TREE_TYPE (t
), args
, complain
, in_decl
);
13128 if (type
== error_mark_node
)
13129 RETURN (error_mark_node
);
13130 TREE_TYPE (r
) = type
;
13131 cp_apply_type_quals_to_decl (cp_type_quals (type
), r
);
13133 if (DECL_C_BIT_FIELD (r
))
13134 /* For bit-fields, DECL_BIT_FIELD_REPRESENTATIVE gives the
13136 DECL_BIT_FIELD_REPRESENTATIVE (r
)
13137 = tsubst_expr (DECL_BIT_FIELD_REPRESENTATIVE (t
), args
,
13139 /*integral_constant_expression_p=*/true);
13140 if (DECL_INITIAL (t
))
13142 /* Set up DECL_TEMPLATE_INFO so that we can get at the
13143 NSDMI in perform_member_init. Still set DECL_INITIAL
13144 so that we know there is one. */
13145 DECL_INITIAL (r
) = void_node
;
13146 gcc_assert (DECL_LANG_SPECIFIC (r
) == NULL
);
13147 retrofit_lang_decl (r
);
13148 DECL_TEMPLATE_INFO (r
) = build_template_info (t
, args
);
13150 /* We don't have to set DECL_CONTEXT here; it is set by
13151 finish_member_declaration. */
13152 DECL_CHAIN (r
) = NULL_TREE
;
13154 apply_late_template_attributes (&r
, DECL_ATTRIBUTES (r
), 0,
13155 args
, complain
, in_decl
);
13158 TREE_VEC_ELT (vec
, i
) = r
;
13167 /* We reach here only for member using decls. We also need to check
13168 uses_template_parms because DECL_DEPENDENT_P is not set for a
13169 using-declaration that designates a member of the current
13170 instantiation (c++/53549). */
13171 if (DECL_DEPENDENT_P (t
)
13172 || uses_template_parms (USING_DECL_SCOPE (t
)))
13174 tree scope
= USING_DECL_SCOPE (t
);
13175 tree name
= tsubst_copy (DECL_NAME (t
), args
, complain
, in_decl
);
13176 if (PACK_EXPANSION_P (scope
))
13178 tree vec
= tsubst_pack_expansion (scope
, args
, complain
, in_decl
);
13179 int len
= TREE_VEC_LENGTH (vec
);
13180 r
= make_tree_vec (len
);
13181 for (int i
= 0; i
< len
; ++i
)
13183 tree escope
= TREE_VEC_ELT (vec
, i
);
13184 tree elt
= do_class_using_decl (escope
, name
);
13187 r
= error_mark_node
;
13192 TREE_PROTECTED (elt
) = TREE_PROTECTED (t
);
13193 TREE_PRIVATE (elt
) = TREE_PRIVATE (t
);
13195 TREE_VEC_ELT (r
, i
) = elt
;
13200 tree inst_scope
= tsubst_copy (USING_DECL_SCOPE (t
), args
,
13201 complain
, in_decl
);
13202 r
= do_class_using_decl (inst_scope
, name
);
13204 r
= error_mark_node
;
13207 TREE_PROTECTED (r
) = TREE_PROTECTED (t
);
13208 TREE_PRIVATE (r
) = TREE_PRIVATE (t
);
13215 DECL_CHAIN (r
) = NULL_TREE
;
13222 tree argvec
= NULL_TREE
;
13223 tree gen_tmpl
= NULL_TREE
;
13225 tree tmpl
= NULL_TREE
;
13227 tree type
= NULL_TREE
;
13230 if (TREE_TYPE (t
) == error_mark_node
)
13231 RETURN (error_mark_node
);
13233 if (TREE_CODE (t
) == TYPE_DECL
13234 && t
== TYPE_MAIN_DECL (TREE_TYPE (t
)))
13236 /* If this is the canonical decl, we don't have to
13237 mess with instantiations, and often we can't (for
13238 typename, template type parms and such). Note that
13239 TYPE_NAME is not correct for the above test if
13240 we've copied the type for a typedef. */
13241 type
= tsubst (TREE_TYPE (t
), args
, complain
, in_decl
);
13242 if (type
== error_mark_node
)
13243 RETURN (error_mark_node
);
13244 r
= TYPE_NAME (type
);
13248 /* Check to see if we already have the specialization we
13251 if (DECL_CLASS_SCOPE_P (t
) || DECL_NAMESPACE_SCOPE_P (t
))
13253 /* T is a static data member or namespace-scope entity.
13254 We have to substitute into namespace-scope variables
13255 (not just variable templates) because of cases like:
13257 template <class T> void f() { extern T t; }
13259 where the entity referenced is not known until
13260 instantiation time. */
13262 ctx
= DECL_CONTEXT (t
);
13263 if (DECL_CLASS_SCOPE_P (t
))
13265 ctx
= tsubst_aggr_type (ctx
, args
,
13267 in_decl
, /*entering_scope=*/1);
13268 /* If CTX is unchanged, then T is in fact the
13269 specialization we want. That situation occurs when
13270 referencing a static data member within in its own
13271 class. We can use pointer equality, rather than
13272 same_type_p, because DECL_CONTEXT is always
13274 if (ctx
== DECL_CONTEXT (t
)
13275 /* ... unless T is a member template; in which
13276 case our caller can be willing to create a
13277 specialization of that template represented
13279 && !(DECL_TI_TEMPLATE (t
)
13280 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (t
))))
13286 tmpl
= DECL_TI_TEMPLATE (t
);
13287 gen_tmpl
= most_general_template (tmpl
);
13288 argvec
= tsubst (DECL_TI_ARGS (t
), args
, complain
, in_decl
);
13289 if (argvec
!= error_mark_node
)
13290 argvec
= (coerce_innermost_template_parms
13291 (DECL_TEMPLATE_PARMS (gen_tmpl
),
13292 argvec
, t
, complain
,
13293 /*all*/true, /*defarg*/true));
13294 if (argvec
== error_mark_node
)
13295 RETURN (error_mark_node
);
13296 hash
= hash_tmpl_and_args (gen_tmpl
, argvec
);
13297 spec
= retrieve_specialization (gen_tmpl
, argvec
, hash
);
13302 /* A local variable. */
13304 /* Subsequent calls to pushdecl will fill this in. */
13306 /* Unless this is a reference to a static variable from an
13307 enclosing function, in which case we need to fill it in now. */
13308 if (TREE_STATIC (t
))
13310 tree fn
= enclosing_instantiation_of (DECL_CONTEXT (t
));
13311 if (fn
!= current_function_decl
)
13314 spec
= retrieve_local_specialization (t
);
13316 /* If we already have the specialization we need, there is
13317 nothing more to do. */
13324 /* Create a new node for the specialization we need. */
13326 if (type
== NULL_TREE
)
13328 if (is_typedef_decl (t
))
13329 type
= DECL_ORIGINAL_TYPE (t
);
13331 type
= TREE_TYPE (t
);
13333 && VAR_HAD_UNKNOWN_BOUND (t
)
13334 && type
!= error_mark_node
)
13335 type
= strip_array_domain (type
);
13336 tree sub_args
= args
;
13337 if (tree auto_node
= type_uses_auto (type
))
13339 /* Mask off any template args past the variable's context so we
13340 don't replace the auto with an unrelated argument. */
13341 int nouter
= TEMPLATE_TYPE_LEVEL (auto_node
) - 1;
13342 int extra
= TMPL_ARGS_DEPTH (args
) - nouter
;
13344 /* This should never happen with the new lambda instantiation
13345 model, but keep the handling just in case. */
13346 gcc_assert (!CHECKING_P
),
13347 sub_args
= strip_innermost_template_args (args
, extra
);
13349 type
= tsubst (type
, sub_args
, complain
, in_decl
);
13353 /* Even if the original location is out of scope, the
13354 newly substituted one is not. */
13355 DECL_DEAD_FOR_LOCAL (r
) = 0;
13356 DECL_INITIALIZED_P (r
) = 0;
13357 DECL_TEMPLATE_INSTANTIATED (r
) = 0;
13358 if (type
== error_mark_node
)
13359 RETURN (error_mark_node
);
13360 if (TREE_CODE (type
) == FUNCTION_TYPE
)
13362 /* It may seem that this case cannot occur, since:
13367 declares a function, not a variable. However:
13370 template <typename T> void g() { T t; }
13371 template void g<f>();
13373 is an attempt to declare a variable with function
13375 error ("variable %qD has function type",
13376 /* R is not yet sufficiently initialized, so we
13377 just use its name. */
13379 RETURN (error_mark_node
);
13381 type
= complete_type (type
);
13382 /* Wait until cp_finish_decl to set this again, to handle
13383 circular dependency (template/instantiate6.C). */
13384 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (r
) = 0;
13385 type
= check_var_type (DECL_NAME (r
), type
);
13387 if (DECL_HAS_VALUE_EXPR_P (t
))
13389 tree ve
= DECL_VALUE_EXPR (t
);
13390 ve
= tsubst_expr (ve
, args
, complain
, in_decl
,
13391 /*constant_expression_p=*/false);
13392 if (REFERENCE_REF_P (ve
))
13394 gcc_assert (TREE_CODE (type
) == REFERENCE_TYPE
);
13395 ve
= TREE_OPERAND (ve
, 0);
13397 SET_DECL_VALUE_EXPR (r
, ve
);
13399 if (CP_DECL_THREAD_LOCAL_P (r
)
13400 && !processing_template_decl
)
13401 set_decl_tls_model (r
, decl_default_tls_model (r
));
13403 else if (DECL_SELF_REFERENCE_P (t
))
13404 SET_DECL_SELF_REFERENCE_P (r
);
13405 TREE_TYPE (r
) = type
;
13406 cp_apply_type_quals_to_decl (cp_type_quals (type
), r
);
13407 DECL_CONTEXT (r
) = ctx
;
13408 /* Clear out the mangled name and RTL for the instantiation. */
13409 SET_DECL_ASSEMBLER_NAME (r
, NULL_TREE
);
13410 if (CODE_CONTAINS_STRUCT (TREE_CODE (t
), TS_DECL_WRTL
))
13411 SET_DECL_RTL (r
, NULL
);
13412 /* The initializer must not be expanded until it is required;
13413 see [temp.inst]. */
13414 DECL_INITIAL (r
) = NULL_TREE
;
13415 DECL_SIZE (r
) = DECL_SIZE_UNIT (r
) = 0;
13418 if (DECL_LANG_SPECIFIC (r
))
13419 SET_DECL_DEPENDENT_INIT_P (r
, false);
13421 SET_DECL_MODE (r
, VOIDmode
);
13423 /* Possibly limit visibility based on template args. */
13424 DECL_VISIBILITY (r
) = VISIBILITY_DEFAULT
;
13425 if (DECL_VISIBILITY_SPECIFIED (t
))
13427 DECL_VISIBILITY_SPECIFIED (r
) = 0;
13428 DECL_ATTRIBUTES (r
)
13429 = remove_attribute ("visibility", DECL_ATTRIBUTES (r
));
13431 determine_visibility (r
);
13436 /* A static data member declaration is always marked
13437 external when it is declared in-class, even if an
13438 initializer is present. We mimic the non-template
13439 processing here. */
13440 DECL_EXTERNAL (r
) = 1;
13441 if (DECL_NAMESPACE_SCOPE_P (t
))
13442 DECL_NOT_REALLY_EXTERN (r
) = 1;
13444 DECL_TEMPLATE_INFO (r
) = build_template_info (tmpl
, argvec
);
13445 SET_DECL_IMPLICIT_INSTANTIATION (r
);
13446 register_specialization (r
, gen_tmpl
, argvec
, false, hash
);
13450 if (DECL_LANG_SPECIFIC (r
))
13451 DECL_TEMPLATE_INFO (r
) = NULL_TREE
;
13452 if (!cp_unevaluated_operand
)
13453 register_local_specialization (r
, t
);
13456 DECL_CHAIN (r
) = NULL_TREE
;
13458 apply_late_template_attributes (&r
, DECL_ATTRIBUTES (r
),
13460 args
, complain
, in_decl
);
13462 /* Preserve a typedef that names a type. */
13463 if (is_typedef_decl (r
) && type
!= error_mark_node
)
13465 DECL_ORIGINAL_TYPE (r
) = NULL_TREE
;
13466 set_underlying_type (r
);
13467 if (TYPE_DECL_ALIAS_P (r
))
13468 /* An alias template specialization can be dependent
13469 even if its underlying type is not. */
13470 TYPE_DEPENDENT_P_VALID (TREE_TYPE (r
)) = false;
13473 layout_decl (r
, 0);
13478 gcc_unreachable ();
13483 /* Restore the file and line information. */
13484 input_location
= saved_loc
;
13489 /* Substitute into the ARG_TYPES of a function type.
13490 If END is a TREE_CHAIN, leave it and any following types
13494 tsubst_arg_types (tree arg_types
,
13497 tsubst_flags_t complain
,
13500 tree remaining_arg_types
;
13501 tree type
= NULL_TREE
;
13503 tree expanded_args
= NULL_TREE
;
13506 if (!arg_types
|| arg_types
== void_list_node
|| arg_types
== end
)
13509 remaining_arg_types
= tsubst_arg_types (TREE_CHAIN (arg_types
),
13510 args
, end
, complain
, in_decl
);
13511 if (remaining_arg_types
== error_mark_node
)
13512 return error_mark_node
;
13514 if (PACK_EXPANSION_P (TREE_VALUE (arg_types
)))
13516 /* For a pack expansion, perform substitution on the
13517 entire expression. Later on, we'll handle the arguments
13519 expanded_args
= tsubst_pack_expansion (TREE_VALUE (arg_types
),
13520 args
, complain
, in_decl
);
13522 if (TREE_CODE (expanded_args
) == TREE_VEC
)
13523 /* So that we'll spin through the parameters, one by one. */
13524 i
= TREE_VEC_LENGTH (expanded_args
);
13527 /* We only partially substituted into the parameter
13528 pack. Our type is TYPE_PACK_EXPANSION. */
13529 type
= expanded_args
;
13530 expanded_args
= NULL_TREE
;
13538 type
= TREE_VEC_ELT (expanded_args
, i
);
13540 type
= tsubst (TREE_VALUE (arg_types
), args
, complain
, in_decl
);
13542 if (type
== error_mark_node
)
13543 return error_mark_node
;
13544 if (VOID_TYPE_P (type
))
13546 if (complain
& tf_error
)
13548 error ("invalid parameter type %qT", type
);
13550 error ("in declaration %q+D", in_decl
);
13552 return error_mark_node
;
13555 if (abstract_virtuals_error_sfinae (ACU_PARM
, type
, complain
))
13556 return error_mark_node
;
13558 /* Do array-to-pointer, function-to-pointer conversion, and ignore
13559 top-level qualifiers as required. */
13560 type
= cv_unqualified (type_decays_to (type
));
13562 /* We do not substitute into default arguments here. The standard
13563 mandates that they be instantiated only when needed, which is
13564 done in build_over_call. */
13565 default_arg
= TREE_PURPOSE (arg_types
);
13567 /* Except that we do substitute default arguments under tsubst_lambda_expr,
13568 since the new op() won't have any associated template arguments for us
13569 to refer to later. */
13570 if (lambda_fn_in_template_p (in_decl
))
13571 default_arg
= tsubst_copy_and_build (default_arg
, args
, complain
, in_decl
,
13572 false/*fn*/, false/*constexpr*/);
13574 if (default_arg
&& TREE_CODE (default_arg
) == DEFAULT_ARG
)
13576 /* We've instantiated a template before its default arguments
13577 have been parsed. This can happen for a nested template
13578 class, and is not an error unless we require the default
13579 argument in a call of this function. */
13580 remaining_arg_types
=
13581 tree_cons (default_arg
, type
, remaining_arg_types
);
13582 vec_safe_push (DEFARG_INSTANTIATIONS(default_arg
), remaining_arg_types
);
13585 remaining_arg_types
=
13586 hash_tree_cons (default_arg
, type
, remaining_arg_types
);
13589 return remaining_arg_types
;
13592 /* Substitute into a FUNCTION_TYPE or METHOD_TYPE. This routine does
13593 *not* handle the exception-specification for FNTYPE, because the
13594 initial substitution of explicitly provided template parameters
13595 during argument deduction forbids substitution into the
13596 exception-specification:
13600 All references in the function type of the function template to the
13601 corresponding template parameters are replaced by the specified tem-
13602 plate argument values. If a substitution in a template parameter or
13603 in the function type of the function template results in an invalid
13604 type, type deduction fails. [Note: The equivalent substitution in
13605 exception specifications is done only when the function is instanti-
13606 ated, at which point a program is ill-formed if the substitution
13607 results in an invalid type.] */
13610 tsubst_function_type (tree t
,
13612 tsubst_flags_t complain
,
13616 tree arg_types
= NULL_TREE
;
13619 /* The TYPE_CONTEXT is not used for function/method types. */
13620 gcc_assert (TYPE_CONTEXT (t
) == NULL_TREE
);
13622 /* DR 1227: Mixing immediate and non-immediate contexts in deduction
13624 bool late_return_type_p
= TYPE_HAS_LATE_RETURN_TYPE (t
);
13626 if (late_return_type_p
)
13628 /* Substitute the argument types. */
13629 arg_types
= tsubst_arg_types (TYPE_ARG_TYPES (t
), args
, NULL_TREE
,
13630 complain
, in_decl
);
13631 if (arg_types
== error_mark_node
)
13632 return error_mark_node
;
13634 tree save_ccp
= current_class_ptr
;
13635 tree save_ccr
= current_class_ref
;
13636 tree this_type
= (TREE_CODE (t
) == METHOD_TYPE
13637 ? TREE_TYPE (TREE_VALUE (arg_types
)) : NULL_TREE
);
13638 bool do_inject
= this_type
&& CLASS_TYPE_P (this_type
);
13641 /* DR 1207: 'this' is in scope in the trailing return type. */
13642 inject_this_parameter (this_type
, cp_type_quals (this_type
));
13645 /* Substitute the return type. */
13646 return_type
= tsubst (TREE_TYPE (t
), args
, complain
, in_decl
);
13650 current_class_ptr
= save_ccp
;
13651 current_class_ref
= save_ccr
;
13655 /* Substitute the return type. */
13656 return_type
= tsubst (TREE_TYPE (t
), args
, complain
, in_decl
);
13658 if (return_type
== error_mark_node
)
13659 return error_mark_node
;
13660 /* DR 486 clarifies that creation of a function type with an
13661 invalid return type is a deduction failure. */
13662 if (TREE_CODE (return_type
) == ARRAY_TYPE
13663 || TREE_CODE (return_type
) == FUNCTION_TYPE
)
13665 if (complain
& tf_error
)
13667 if (TREE_CODE (return_type
) == ARRAY_TYPE
)
13668 error ("function returning an array");
13670 error ("function returning a function");
13672 return error_mark_node
;
13675 if (abstract_virtuals_error_sfinae (ACU_RETURN
, return_type
, complain
))
13676 return error_mark_node
;
13678 if (!late_return_type_p
)
13680 /* Substitute the argument types. */
13681 arg_types
= tsubst_arg_types (TYPE_ARG_TYPES (t
), args
, NULL_TREE
,
13682 complain
, in_decl
);
13683 if (arg_types
== error_mark_node
)
13684 return error_mark_node
;
13687 /* Construct a new type node and return it. */
13688 if (TREE_CODE (t
) == FUNCTION_TYPE
)
13690 fntype
= build_function_type (return_type
, arg_types
);
13691 fntype
= apply_memfn_quals (fntype
,
13692 type_memfn_quals (t
),
13693 type_memfn_rqual (t
));
13697 tree r
= TREE_TYPE (TREE_VALUE (arg_types
));
13698 /* Don't pick up extra function qualifiers from the basetype. */
13699 r
= cp_build_qualified_type_real (r
, type_memfn_quals (t
), complain
);
13700 if (! MAYBE_CLASS_TYPE_P (r
))
13704 Type deduction may fail for any of the following
13707 -- Attempting to create "pointer to member of T" when T
13708 is not a class type. */
13709 if (complain
& tf_error
)
13710 error ("creating pointer to member function of non-class type %qT",
13712 return error_mark_node
;
13715 fntype
= build_method_type_directly (r
, return_type
,
13716 TREE_CHAIN (arg_types
));
13717 fntype
= build_ref_qualified_type (fntype
, type_memfn_rqual (t
));
13719 fntype
= cp_build_type_attribute_variant (fntype
, TYPE_ATTRIBUTES (t
));
13721 if (late_return_type_p
)
13722 TYPE_HAS_LATE_RETURN_TYPE (fntype
) = 1;
13727 /* FNTYPE is a FUNCTION_TYPE or METHOD_TYPE. Substitute the template
13728 ARGS into that specification, and return the substituted
13729 specification. If there is no specification, return NULL_TREE. */
13732 tsubst_exception_specification (tree fntype
,
13734 tsubst_flags_t complain
,
13741 specs
= TYPE_RAISES_EXCEPTIONS (fntype
);
13742 new_specs
= NULL_TREE
;
13743 if (specs
&& TREE_PURPOSE (specs
))
13745 /* A noexcept-specifier. */
13746 tree expr
= TREE_PURPOSE (specs
);
13747 if (TREE_CODE (expr
) == INTEGER_CST
)
13751 /* Defer instantiation of noexcept-specifiers to avoid
13752 excessive instantiations (c++/49107). */
13753 new_specs
= make_node (DEFERRED_NOEXCEPT
);
13754 if (DEFERRED_NOEXCEPT_SPEC_P (specs
))
13756 /* We already partially instantiated this member template,
13757 so combine the new args with the old. */
13758 DEFERRED_NOEXCEPT_PATTERN (new_specs
)
13759 = DEFERRED_NOEXCEPT_PATTERN (expr
);
13760 DEFERRED_NOEXCEPT_ARGS (new_specs
)
13761 = add_to_template_args (DEFERRED_NOEXCEPT_ARGS (expr
), args
);
13765 DEFERRED_NOEXCEPT_PATTERN (new_specs
) = expr
;
13766 DEFERRED_NOEXCEPT_ARGS (new_specs
) = args
;
13770 new_specs
= tsubst_copy_and_build
13771 (expr
, args
, complain
, in_decl
, /*function_p=*/false,
13772 /*integral_constant_expression_p=*/true);
13773 new_specs
= build_noexcept_spec (new_specs
, complain
);
13777 if (! TREE_VALUE (specs
))
13784 tree expanded_specs
= NULL_TREE
;
13786 if (PACK_EXPANSION_P (TREE_VALUE (specs
)))
13788 /* Expand the pack expansion type. */
13789 expanded_specs
= tsubst_pack_expansion (TREE_VALUE (specs
),
13793 if (expanded_specs
== error_mark_node
)
13794 return error_mark_node
;
13795 else if (TREE_CODE (expanded_specs
) == TREE_VEC
)
13796 len
= TREE_VEC_LENGTH (expanded_specs
);
13799 /* We're substituting into a member template, so
13800 we got a TYPE_PACK_EXPANSION back. Add that
13801 expansion and move on. */
13802 gcc_assert (TREE_CODE (expanded_specs
)
13803 == TYPE_PACK_EXPANSION
);
13804 new_specs
= add_exception_specifier (new_specs
,
13807 specs
= TREE_CHAIN (specs
);
13812 for (i
= 0; i
< len
; ++i
)
13814 if (expanded_specs
)
13815 spec
= TREE_VEC_ELT (expanded_specs
, i
);
13817 spec
= tsubst (TREE_VALUE (specs
), args
, complain
, in_decl
);
13818 if (spec
== error_mark_node
)
13820 new_specs
= add_exception_specifier (new_specs
, spec
,
13824 specs
= TREE_CHAIN (specs
);
13830 /* Take the tree structure T and replace template parameters used
13831 therein with the argument vector ARGS. IN_DECL is an associated
13832 decl for diagnostics. If an error occurs, returns ERROR_MARK_NODE.
13833 Issue error and warning messages under control of COMPLAIN. Note
13834 that we must be relatively non-tolerant of extensions here, in
13835 order to preserve conformance; if we allow substitutions that
13836 should not be allowed, we may allow argument deductions that should
13837 not succeed, and therefore report ambiguous overload situations
13838 where there are none. In theory, we could allow the substitution,
13839 but indicate that it should have failed, and allow our caller to
13840 make sure that the right thing happens, but we don't try to do this
13843 This function is used for dealing with types, decls and the like;
13844 for expressions, use tsubst_expr or tsubst_copy. */
13847 tsubst (tree t
, tree args
, tsubst_flags_t complain
, tree in_decl
)
13849 enum tree_code code
;
13850 tree type
, r
= NULL_TREE
;
13852 if (t
== NULL_TREE
|| t
== error_mark_node
13853 || t
== integer_type_node
13854 || t
== void_type_node
13855 || t
== char_type_node
13856 || t
== unknown_type_node
13857 || TREE_CODE (t
) == NAMESPACE_DECL
13858 || TREE_CODE (t
) == TRANSLATION_UNIT_DECL
)
13862 return tsubst_decl (t
, args
, complain
);
13864 if (args
== NULL_TREE
)
13867 code
= TREE_CODE (t
);
13869 if (code
== IDENTIFIER_NODE
)
13870 type
= IDENTIFIER_TYPE_VALUE (t
);
13872 type
= TREE_TYPE (t
);
13874 gcc_assert (type
!= unknown_type_node
);
13876 /* Reuse typedefs. We need to do this to handle dependent attributes,
13877 such as attribute aligned. */
13879 && typedef_variant_p (t
))
13881 tree decl
= TYPE_NAME (t
);
13883 if (alias_template_specialization_p (t
))
13885 /* DECL represents an alias template and we want to
13887 tree tmpl
= most_general_template (DECL_TI_TEMPLATE (decl
));
13888 tree gen_args
= tsubst (DECL_TI_ARGS (decl
), args
, complain
, in_decl
);
13889 r
= instantiate_alias_template (tmpl
, gen_args
, complain
);
13891 else if (DECL_CLASS_SCOPE_P (decl
)
13892 && CLASSTYPE_TEMPLATE_INFO (DECL_CONTEXT (decl
))
13893 && uses_template_parms (DECL_CONTEXT (decl
)))
13895 tree tmpl
= most_general_template (DECL_TI_TEMPLATE (decl
));
13896 tree gen_args
= tsubst (DECL_TI_ARGS (decl
), args
, complain
, in_decl
);
13897 r
= retrieve_specialization (tmpl
, gen_args
, 0);
13899 else if (DECL_FUNCTION_SCOPE_P (decl
)
13900 && DECL_TEMPLATE_INFO (DECL_CONTEXT (decl
))
13901 && uses_template_parms (DECL_TI_ARGS (DECL_CONTEXT (decl
))))
13902 r
= retrieve_local_specialization (decl
);
13904 /* The typedef is from a non-template context. */
13910 r
= cp_build_qualified_type_real
13911 (r
, cp_type_quals (t
) | cp_type_quals (r
),
13912 complain
| tf_ignore_bad_quals
);
13917 /* We don't have an instantiation yet, so drop the typedef. */
13918 int quals
= cp_type_quals (t
);
13919 t
= DECL_ORIGINAL_TYPE (decl
);
13920 t
= cp_build_qualified_type_real (t
, quals
,
13921 complain
| tf_ignore_bad_quals
);
13925 bool fndecl_type
= (complain
& tf_fndecl_type
);
13926 complain
&= ~tf_fndecl_type
;
13929 && code
!= TYPENAME_TYPE
13930 && code
!= TEMPLATE_TYPE_PARM
13931 && code
!= TEMPLATE_PARM_INDEX
13932 && code
!= IDENTIFIER_NODE
13933 && code
!= FUNCTION_TYPE
13934 && code
!= METHOD_TYPE
)
13935 type
= tsubst (type
, args
, complain
, in_decl
);
13936 if (type
== error_mark_node
)
13937 return error_mark_node
;
13943 case ENUMERAL_TYPE
:
13944 return tsubst_aggr_type (t
, args
, complain
, in_decl
,
13945 /*entering_scope=*/0);
13948 case IDENTIFIER_NODE
:
13959 if (t
== integer_type_node
)
13962 if (TREE_CODE (TYPE_MIN_VALUE (t
)) == INTEGER_CST
13963 && TREE_CODE (TYPE_MAX_VALUE (t
)) == INTEGER_CST
)
13967 tree max
, omax
= TREE_OPERAND (TYPE_MAX_VALUE (t
), 0);
13969 max
= tsubst_expr (omax
, args
, complain
, in_decl
,
13970 /*integral_constant_expression_p=*/false);
13972 /* Fix up type of the magic NOP_EXPR with TREE_SIDE_EFFECTS if
13974 if (TREE_CODE (max
) == NOP_EXPR
13975 && TREE_SIDE_EFFECTS (omax
)
13976 && !TREE_TYPE (max
))
13977 TREE_TYPE (max
) = TREE_TYPE (TREE_OPERAND (max
, 0));
13979 /* If we're in a partial instantiation, preserve the magic NOP_EXPR
13980 with TREE_SIDE_EFFECTS that indicates this is not an integral
13981 constant expression. */
13982 if (processing_template_decl
13983 && TREE_SIDE_EFFECTS (omax
) && TREE_CODE (omax
) == NOP_EXPR
)
13985 gcc_assert (TREE_CODE (max
) == NOP_EXPR
);
13986 TREE_SIDE_EFFECTS (max
) = 1;
13989 return compute_array_index_type (NULL_TREE
, max
, complain
);
13992 case TEMPLATE_TYPE_PARM
:
13993 case TEMPLATE_TEMPLATE_PARM
:
13994 case BOUND_TEMPLATE_TEMPLATE_PARM
:
13995 case TEMPLATE_PARM_INDEX
:
14000 tree arg
= NULL_TREE
;
14002 /* Early in template argument deduction substitution, we don't
14003 want to reduce the level of 'auto', or it will be confused
14004 with a normal template parm in subsequent deduction. */
14005 if (is_auto (t
) && (complain
& tf_partial
))
14010 gcc_assert (TREE_VEC_LENGTH (args
) > 0);
14011 template_parm_level_and_index (t
, &level
, &idx
);
14013 levels
= TMPL_ARGS_DEPTH (args
);
14014 if (level
<= levels
14015 && TREE_VEC_LENGTH (TMPL_ARGS_LEVEL (args
, level
)) > 0)
14017 arg
= TMPL_ARG (args
, level
, idx
);
14019 /* See through ARGUMENT_PACK_SELECT arguments. */
14020 if (arg
&& TREE_CODE (arg
) == ARGUMENT_PACK_SELECT
)
14021 arg
= argument_pack_select_arg (arg
);
14024 if (arg
== error_mark_node
)
14025 return error_mark_node
;
14026 else if (arg
!= NULL_TREE
)
14028 if (ARGUMENT_PACK_P (arg
))
14029 /* If ARG is an argument pack, we don't actually want to
14030 perform a substitution here, because substitutions
14031 for argument packs are only done
14032 element-by-element. We can get to this point when
14033 substituting the type of a non-type template
14034 parameter pack, when that type actually contains
14035 template parameter packs from an outer template, e.g.,
14037 template<typename... Types> struct A {
14038 template<Types... Values> struct B { };
14042 if (code
== TEMPLATE_TYPE_PARM
)
14045 gcc_assert (TYPE_P (arg
));
14047 quals
= cp_type_quals (arg
) | cp_type_quals (t
);
14049 return cp_build_qualified_type_real
14050 (arg
, quals
, complain
| tf_ignore_bad_quals
);
14052 else if (code
== BOUND_TEMPLATE_TEMPLATE_PARM
)
14054 /* We are processing a type constructed from a
14055 template template parameter. */
14056 tree argvec
= tsubst (TYPE_TI_ARGS (t
),
14057 args
, complain
, in_decl
);
14058 if (argvec
== error_mark_node
)
14059 return error_mark_node
;
14061 gcc_assert (TREE_CODE (arg
) == TEMPLATE_TEMPLATE_PARM
14062 || TREE_CODE (arg
) == TEMPLATE_DECL
14063 || TREE_CODE (arg
) == UNBOUND_CLASS_TEMPLATE
);
14065 if (TREE_CODE (arg
) == UNBOUND_CLASS_TEMPLATE
)
14066 /* Consider this code:
14068 template <template <class> class Template>
14070 template <class Arg> using Bind = Template<Arg>;
14073 template <template <class> class Template, class Arg>
14074 using Instantiate = Template<Arg>; //#0
14076 template <template <class> class Template,
14079 Instantiate<Internal<Template>::template Bind,
14082 When #1 is parsed, the
14083 BOUND_TEMPLATE_TEMPLATE_PARM representing the
14084 parameter `Template' in #0 matches the
14085 UNBOUND_CLASS_TEMPLATE representing the argument
14086 `Internal<Template>::template Bind'; We then want
14087 to assemble the type `Bind<Argument>' that can't
14088 be fully created right now, because
14089 `Internal<Template>' not being complete, the Bind
14090 template cannot be looked up in that context. So
14091 we need to "store" `Bind<Argument>' for later
14092 when the context of Bind becomes complete. Let's
14093 store that in a TYPENAME_TYPE. */
14094 return make_typename_type (TYPE_CONTEXT (arg
),
14095 build_nt (TEMPLATE_ID_EXPR
,
14096 TYPE_IDENTIFIER (arg
),
14101 /* We can get a TEMPLATE_TEMPLATE_PARM here when we
14102 are resolving nested-types in the signature of a
14103 member function templates. Otherwise ARG is a
14104 TEMPLATE_DECL and is the real template to be
14106 if (TREE_CODE (arg
) == TEMPLATE_TEMPLATE_PARM
)
14107 arg
= TYPE_NAME (arg
);
14109 r
= lookup_template_class (arg
,
14111 DECL_CONTEXT (arg
),
14112 /*entering_scope=*/0,
14114 return cp_build_qualified_type_real
14115 (r
, cp_type_quals (t
) | cp_type_quals (r
), complain
);
14117 else if (code
== TEMPLATE_TEMPLATE_PARM
)
14120 /* TEMPLATE_PARM_INDEX. */
14121 return convert_from_reference (unshare_expr (arg
));
14125 /* This can happen during the attempted tsubst'ing in
14126 unify. This means that we don't yet have any information
14127 about the template parameter in question. */
14130 /* If we get here, we must have been looking at a parm for a
14131 more deeply nested template. Make a new version of this
14132 template parameter, but with a lower level. */
14135 case TEMPLATE_TYPE_PARM
:
14136 case TEMPLATE_TEMPLATE_PARM
:
14137 case BOUND_TEMPLATE_TEMPLATE_PARM
:
14138 if (cp_type_quals (t
))
14140 r
= tsubst (TYPE_MAIN_VARIANT (t
), args
, complain
, in_decl
);
14141 r
= cp_build_qualified_type_real
14142 (r
, cp_type_quals (t
),
14143 complain
| (code
== TEMPLATE_TYPE_PARM
14144 ? tf_ignore_bad_quals
: 0));
14146 else if (TREE_CODE (t
) == TEMPLATE_TYPE_PARM
14147 && PLACEHOLDER_TYPE_CONSTRAINTS (t
)
14148 && (r
= (TEMPLATE_PARM_DESCENDANTS
14149 (TEMPLATE_TYPE_PARM_INDEX (t
))))
14150 && (r
= TREE_TYPE (r
))
14151 && !PLACEHOLDER_TYPE_CONSTRAINTS (r
))
14152 /* Break infinite recursion when substituting the constraints
14153 of a constrained placeholder. */;
14157 TEMPLATE_TYPE_PARM_INDEX (r
)
14158 = reduce_template_parm_level (TEMPLATE_TYPE_PARM_INDEX (t
),
14159 r
, levels
, args
, complain
);
14160 TYPE_STUB_DECL (r
) = TYPE_NAME (r
) = TEMPLATE_TYPE_DECL (r
);
14161 TYPE_MAIN_VARIANT (r
) = r
;
14162 TYPE_POINTER_TO (r
) = NULL_TREE
;
14163 TYPE_REFERENCE_TO (r
) = NULL_TREE
;
14165 if (TREE_CODE (t
) == TEMPLATE_TYPE_PARM
)
14167 /* Propagate constraints on placeholders. */
14168 if (tree constr
= PLACEHOLDER_TYPE_CONSTRAINTS (t
))
14169 PLACEHOLDER_TYPE_CONSTRAINTS (r
)
14170 = tsubst_constraint (constr
, args
, complain
, in_decl
);
14171 else if (tree pl
= CLASS_PLACEHOLDER_TEMPLATE (t
))
14173 pl
= tsubst_copy (pl
, args
, complain
, in_decl
);
14174 CLASS_PLACEHOLDER_TEMPLATE (r
) = pl
;
14178 if (TREE_CODE (r
) == TEMPLATE_TEMPLATE_PARM
)
14179 /* We have reduced the level of the template
14180 template parameter, but not the levels of its
14181 template parameters, so canonical_type_parameter
14182 will not be able to find the canonical template
14183 template parameter for this level. Thus, we
14184 require structural equality checking to compare
14185 TEMPLATE_TEMPLATE_PARMs. */
14186 SET_TYPE_STRUCTURAL_EQUALITY (r
);
14187 else if (TYPE_STRUCTURAL_EQUALITY_P (t
))
14188 SET_TYPE_STRUCTURAL_EQUALITY (r
);
14190 TYPE_CANONICAL (r
) = canonical_type_parameter (r
);
14192 if (code
== BOUND_TEMPLATE_TEMPLATE_PARM
)
14194 tree tinfo
= TYPE_TEMPLATE_INFO (t
);
14195 /* We might need to substitute into the types of non-type
14196 template parameters. */
14197 tree tmpl
= tsubst (TI_TEMPLATE (tinfo
), args
,
14198 complain
, in_decl
);
14199 if (tmpl
== error_mark_node
)
14200 return error_mark_node
;
14201 tree argvec
= tsubst (TI_ARGS (tinfo
), args
,
14202 complain
, in_decl
);
14203 if (argvec
== error_mark_node
)
14204 return error_mark_node
;
14206 TEMPLATE_TEMPLATE_PARM_TEMPLATE_INFO (r
)
14207 = build_template_info (tmpl
, argvec
);
14212 case TEMPLATE_PARM_INDEX
:
14213 /* OK, now substitute the type of the non-type parameter. We
14214 couldn't do it earlier because it might be an auto parameter,
14215 and we wouldn't need to if we had an argument. */
14216 type
= tsubst (type
, args
, complain
, in_decl
);
14217 if (type
== error_mark_node
)
14218 return error_mark_node
;
14219 r
= reduce_template_parm_level (t
, type
, levels
, args
, complain
);
14223 gcc_unreachable ();
14231 tree purpose
, value
, chain
;
14233 if (t
== void_list_node
)
14236 purpose
= TREE_PURPOSE (t
);
14239 purpose
= tsubst (purpose
, args
, complain
, in_decl
);
14240 if (purpose
== error_mark_node
)
14241 return error_mark_node
;
14243 value
= TREE_VALUE (t
);
14246 value
= tsubst (value
, args
, complain
, in_decl
);
14247 if (value
== error_mark_node
)
14248 return error_mark_node
;
14250 chain
= TREE_CHAIN (t
);
14251 if (chain
&& chain
!= void_type_node
)
14253 chain
= tsubst (chain
, args
, complain
, in_decl
);
14254 if (chain
== error_mark_node
)
14255 return error_mark_node
;
14257 if (purpose
== TREE_PURPOSE (t
)
14258 && value
== TREE_VALUE (t
)
14259 && chain
== TREE_CHAIN (t
))
14261 return hash_tree_cons (purpose
, value
, chain
);
14265 /* We should never be tsubsting a binfo. */
14266 gcc_unreachable ();
14269 /* A vector of template arguments. */
14270 gcc_assert (!type
);
14271 return tsubst_template_args (t
, args
, complain
, in_decl
);
14274 case REFERENCE_TYPE
:
14276 if (type
== TREE_TYPE (t
) && TREE_CODE (type
) != METHOD_TYPE
)
14281 Type deduction may fail for any of the following
14284 -- Attempting to create a pointer to reference type.
14285 -- Attempting to create a reference to a reference type or
14286 a reference to void.
14288 Core issue 106 says that creating a reference to a reference
14289 during instantiation is no longer a cause for failure. We
14290 only enforce this check in strict C++98 mode. */
14291 if ((TREE_CODE (type
) == REFERENCE_TYPE
14292 && (((cxx_dialect
== cxx98
) && flag_iso
) || code
!= REFERENCE_TYPE
))
14293 || (code
== REFERENCE_TYPE
&& VOID_TYPE_P (type
)))
14295 static location_t last_loc
;
14297 /* We keep track of the last time we issued this error
14298 message to avoid spewing a ton of messages during a
14299 single bad template instantiation. */
14300 if (complain
& tf_error
14301 && last_loc
!= input_location
)
14303 if (VOID_TYPE_P (type
))
14304 error ("forming reference to void");
14305 else if (code
== POINTER_TYPE
)
14306 error ("forming pointer to reference type %qT", type
);
14308 error ("forming reference to reference type %qT", type
);
14309 last_loc
= input_location
;
14312 return error_mark_node
;
14314 else if (TREE_CODE (type
) == FUNCTION_TYPE
14315 && (type_memfn_quals (type
) != TYPE_UNQUALIFIED
14316 || type_memfn_rqual (type
) != REF_QUAL_NONE
))
14318 if (complain
& tf_error
)
14320 if (code
== POINTER_TYPE
)
14321 error ("forming pointer to qualified function type %qT",
14324 error ("forming reference to qualified function type %qT",
14327 return error_mark_node
;
14329 else if (code
== POINTER_TYPE
)
14331 r
= build_pointer_type (type
);
14332 if (TREE_CODE (type
) == METHOD_TYPE
)
14333 r
= build_ptrmemfunc_type (r
);
14335 else if (TREE_CODE (type
) == REFERENCE_TYPE
)
14336 /* In C++0x, during template argument substitution, when there is an
14337 attempt to create a reference to a reference type, reference
14338 collapsing is applied as described in [14.3.1/4 temp.arg.type]:
14340 "If a template-argument for a template-parameter T names a type
14341 that is a reference to a type A, an attempt to create the type
14342 'lvalue reference to cv T' creates the type 'lvalue reference to
14343 A,' while an attempt to create the type type rvalue reference to
14344 cv T' creates the type T"
14346 r
= cp_build_reference_type
14348 TYPE_REF_IS_RVALUE (t
) && TYPE_REF_IS_RVALUE (type
));
14350 r
= cp_build_reference_type (type
, TYPE_REF_IS_RVALUE (t
));
14351 r
= cp_build_qualified_type_real (r
, cp_type_quals (t
), complain
);
14353 if (r
!= error_mark_node
)
14354 /* Will this ever be needed for TYPE_..._TO values? */
14361 r
= tsubst (TYPE_OFFSET_BASETYPE (t
), args
, complain
, in_decl
);
14362 if (r
== error_mark_node
|| !MAYBE_CLASS_TYPE_P (r
))
14366 Type deduction may fail for any of the following
14369 -- Attempting to create "pointer to member of T" when T
14370 is not a class type. */
14371 if (complain
& tf_error
)
14372 error ("creating pointer to member of non-class type %qT", r
);
14373 return error_mark_node
;
14375 if (TREE_CODE (type
) == REFERENCE_TYPE
)
14377 if (complain
& tf_error
)
14378 error ("creating pointer to member reference type %qT", type
);
14379 return error_mark_node
;
14381 if (VOID_TYPE_P (type
))
14383 if (complain
& tf_error
)
14384 error ("creating pointer to member of type void");
14385 return error_mark_node
;
14387 gcc_assert (TREE_CODE (type
) != METHOD_TYPE
);
14388 if (TREE_CODE (type
) == FUNCTION_TYPE
)
14390 /* The type of the implicit object parameter gets its
14391 cv-qualifiers from the FUNCTION_TYPE. */
14394 = build_memfn_type (type
, r
, type_memfn_quals (type
),
14395 type_memfn_rqual (type
));
14396 memptr
= build_ptrmemfunc_type (build_pointer_type (method_type
));
14397 return cp_build_qualified_type_real (memptr
, cp_type_quals (t
),
14401 return cp_build_qualified_type_real (build_ptrmem_type (r
, type
),
14405 case FUNCTION_TYPE
:
14410 fntype
= tsubst_function_type (t
, args
, complain
, in_decl
);
14411 if (fntype
== error_mark_node
)
14412 return error_mark_node
;
14414 /* Substitute the exception specification. */
14415 specs
= tsubst_exception_specification (t
, args
, complain
, in_decl
,
14416 /*defer_ok*/fndecl_type
);
14417 if (specs
== error_mark_node
)
14418 return error_mark_node
;
14420 fntype
= build_exception_variant (fntype
, specs
);
14425 tree domain
= tsubst (TYPE_DOMAIN (t
), args
, complain
, in_decl
);
14426 if (domain
== error_mark_node
)
14427 return error_mark_node
;
14429 /* As an optimization, we avoid regenerating the array type if
14430 it will obviously be the same as T. */
14431 if (type
== TREE_TYPE (t
) && domain
== TYPE_DOMAIN (t
))
14434 /* These checks should match the ones in create_array_type_for_decl.
14438 The deduction may fail for any of the following reasons:
14440 -- Attempting to create an array with an element type that
14441 is void, a function type, or a reference type, or [DR337]
14442 an abstract class type. */
14443 if (VOID_TYPE_P (type
)
14444 || TREE_CODE (type
) == FUNCTION_TYPE
14445 || (TREE_CODE (type
) == ARRAY_TYPE
14446 && TYPE_DOMAIN (type
) == NULL_TREE
)
14447 || TREE_CODE (type
) == REFERENCE_TYPE
)
14449 if (complain
& tf_error
)
14450 error ("creating array of %qT", type
);
14451 return error_mark_node
;
14454 if (abstract_virtuals_error_sfinae (ACU_ARRAY
, type
, complain
))
14455 return error_mark_node
;
14457 r
= build_cplus_array_type (type
, domain
);
14459 if (TYPE_USER_ALIGN (t
))
14461 SET_TYPE_ALIGN (r
, TYPE_ALIGN (t
));
14462 TYPE_USER_ALIGN (r
) = 1;
14468 case TYPENAME_TYPE
:
14470 tree ctx
= tsubst_aggr_type (TYPE_CONTEXT (t
), args
, complain
,
14471 in_decl
, /*entering_scope=*/1);
14472 if (ctx
== error_mark_node
)
14473 return error_mark_node
;
14475 tree f
= tsubst_copy (TYPENAME_TYPE_FULLNAME (t
), args
,
14476 complain
, in_decl
);
14477 if (f
== error_mark_node
)
14478 return error_mark_node
;
14480 if (!MAYBE_CLASS_TYPE_P (ctx
))
14482 if (complain
& tf_error
)
14483 error ("%qT is not a class, struct, or union type", ctx
);
14484 return error_mark_node
;
14486 else if (!uses_template_parms (ctx
) && !TYPE_BEING_DEFINED (ctx
))
14488 /* Normally, make_typename_type does not require that the CTX
14489 have complete type in order to allow things like:
14491 template <class T> struct S { typename S<T>::X Y; };
14493 But, such constructs have already been resolved by this
14494 point, so here CTX really should have complete type, unless
14495 it's a partial instantiation. */
14496 ctx
= complete_type (ctx
);
14497 if (!COMPLETE_TYPE_P (ctx
))
14499 if (complain
& tf_error
)
14500 cxx_incomplete_type_error (NULL_TREE
, ctx
);
14501 return error_mark_node
;
14505 f
= make_typename_type (ctx
, f
, typename_type
,
14506 complain
| tf_keep_type_decl
);
14507 if (f
== error_mark_node
)
14509 if (TREE_CODE (f
) == TYPE_DECL
)
14511 complain
|= tf_ignore_bad_quals
;
14515 if (TREE_CODE (f
) != TYPENAME_TYPE
)
14517 if (TYPENAME_IS_ENUM_P (t
) && TREE_CODE (f
) != ENUMERAL_TYPE
)
14519 if (complain
& tf_error
)
14520 error ("%qT resolves to %qT, which is not an enumeration type",
14523 return error_mark_node
;
14525 else if (TYPENAME_IS_CLASS_P (t
) && !CLASS_TYPE_P (f
))
14527 if (complain
& tf_error
)
14528 error ("%qT resolves to %qT, which is is not a class type",
14531 return error_mark_node
;
14535 return cp_build_qualified_type_real
14536 (f
, cp_type_quals (f
) | cp_type_quals (t
), complain
);
14539 case UNBOUND_CLASS_TEMPLATE
:
14541 tree ctx
= tsubst_aggr_type (TYPE_CONTEXT (t
), args
, complain
,
14542 in_decl
, /*entering_scope=*/1);
14543 tree name
= TYPE_IDENTIFIER (t
);
14544 tree parm_list
= DECL_TEMPLATE_PARMS (TYPE_NAME (t
));
14546 if (ctx
== error_mark_node
|| name
== error_mark_node
)
14547 return error_mark_node
;
14550 parm_list
= tsubst_template_parms (parm_list
, args
, complain
);
14551 return make_unbound_class_template (ctx
, name
, parm_list
, complain
);
14558 ++cp_unevaluated_operand
;
14559 ++c_inhibit_evaluation_warnings
;
14561 type
= tsubst_expr (TYPEOF_TYPE_EXPR (t
), args
,
14563 /*integral_constant_expression_p=*/false);
14565 --cp_unevaluated_operand
;
14566 --c_inhibit_evaluation_warnings
;
14568 type
= finish_typeof (type
);
14569 return cp_build_qualified_type_real (type
,
14571 | cp_type_quals (type
),
14575 case DECLTYPE_TYPE
:
14579 ++cp_unevaluated_operand
;
14580 ++c_inhibit_evaluation_warnings
;
14582 type
= tsubst_copy_and_build (DECLTYPE_TYPE_EXPR (t
), args
,
14583 complain
|tf_decltype
, in_decl
,
14584 /*function_p*/false,
14585 /*integral_constant_expression*/false);
14587 if (DECLTYPE_FOR_INIT_CAPTURE (t
))
14589 if (type
== NULL_TREE
)
14591 if (complain
& tf_error
)
14592 error ("empty initializer in lambda init-capture");
14593 type
= error_mark_node
;
14595 else if (TREE_CODE (type
) == TREE_LIST
)
14596 type
= build_x_compound_expr_from_list (type
, ELK_INIT
, complain
);
14599 --cp_unevaluated_operand
;
14600 --c_inhibit_evaluation_warnings
;
14602 if (DECLTYPE_FOR_LAMBDA_CAPTURE (t
))
14603 type
= lambda_capture_field_type (type
,
14604 DECLTYPE_FOR_INIT_CAPTURE (t
),
14605 DECLTYPE_FOR_REF_CAPTURE (t
));
14606 else if (DECLTYPE_FOR_LAMBDA_PROXY (t
))
14607 type
= lambda_proxy_type (type
);
14610 bool id
= DECLTYPE_TYPE_ID_EXPR_OR_MEMBER_ACCESS_P (t
);
14611 if (id
&& TREE_CODE (DECLTYPE_TYPE_EXPR (t
)) == BIT_NOT_EXPR
14613 /* In a template ~id could be either a complement expression
14614 or an unqualified-id naming a destructor; if instantiating
14615 it produces an expression, it's not an id-expression or
14618 type
= finish_decltype_type (type
, id
, complain
);
14620 return cp_build_qualified_type_real (type
,
14622 | cp_type_quals (type
),
14623 complain
| tf_ignore_bad_quals
);
14626 case UNDERLYING_TYPE
:
14628 tree type
= tsubst (UNDERLYING_TYPE_TYPE (t
), args
,
14629 complain
, in_decl
);
14630 return finish_underlying_type (type
);
14633 case TYPE_ARGUMENT_PACK
:
14634 case NONTYPE_ARGUMENT_PACK
:
14638 if (code
== NONTYPE_ARGUMENT_PACK
)
14639 r
= make_node (code
);
14641 r
= cxx_make_type (code
);
14643 tree pack_args
= ARGUMENT_PACK_ARGS (t
);
14644 pack_args
= tsubst_template_args (pack_args
, args
, complain
, in_decl
);
14645 SET_ARGUMENT_PACK_ARGS (r
, pack_args
);
14663 /* We should use one of the expression tsubsts for these codes. */
14664 gcc_unreachable ();
14667 sorry ("use of %qs in template", get_tree_code_name (code
));
14668 return error_mark_node
;
14672 /* tsubst a BASELINK. OBJECT_TYPE, if non-NULL, is the type of the
14673 expression on the left-hand side of the "." or "->" operator. We
14674 only do the lookup if we had a dependent BASELINK. Otherwise we
14675 adjust it onto the instantiated heirarchy. */
14678 tsubst_baselink (tree baselink
, tree object_type
,
14679 tree args
, tsubst_flags_t complain
, tree in_decl
)
14681 bool qualified_p
= BASELINK_QUALIFIED_P (baselink
);
14682 tree qualifying_scope
= BINFO_TYPE (BASELINK_ACCESS_BINFO (baselink
));
14683 qualifying_scope
= tsubst (qualifying_scope
, args
, complain
, in_decl
);
14685 tree optype
= BASELINK_OPTYPE (baselink
);
14686 optype
= tsubst (optype
, args
, complain
, in_decl
);
14688 tree template_args
= NULL_TREE
;
14689 bool template_id_p
= false;
14690 tree fns
= BASELINK_FUNCTIONS (baselink
);
14691 if (TREE_CODE (fns
) == TEMPLATE_ID_EXPR
)
14693 template_id_p
= true;
14694 template_args
= TREE_OPERAND (fns
, 1);
14695 fns
= TREE_OPERAND (fns
, 0);
14697 template_args
= tsubst_template_args (template_args
, args
,
14698 complain
, in_decl
);
14701 tree binfo_type
= BINFO_TYPE (BASELINK_BINFO (baselink
));
14702 binfo_type
= tsubst (binfo_type
, args
, complain
, in_decl
);
14703 bool dependent_p
= binfo_type
!= BINFO_TYPE (BASELINK_BINFO (baselink
));
14707 tree name
= OVL_NAME (fns
);
14708 if (IDENTIFIER_CONV_OP_P (name
))
14709 name
= make_conv_op_name (optype
);
14711 if (name
== complete_dtor_identifier
)
14712 /* Treat as-if non-dependent below. */
14713 dependent_p
= false;
14715 baselink
= lookup_fnfields (qualifying_scope
, name
, /*protect=*/1);
14718 if ((complain
& tf_error
)
14719 && constructor_name_p (name
, qualifying_scope
))
14720 error ("cannot call constructor %<%T::%D%> directly",
14721 qualifying_scope
, name
);
14722 return error_mark_node
;
14725 if (BASELINK_P (baselink
))
14726 fns
= BASELINK_FUNCTIONS (baselink
);
14729 /* We're going to overwrite pieces below, make a duplicate. */
14730 baselink
= copy_node (baselink
);
14732 /* If lookup found a single function, mark it as used at this point.
14733 (If lookup found multiple functions the one selected later by
14734 overload resolution will be marked as used at that point.) */
14735 if (!template_id_p
&& !really_overloaded_fn (fns
))
14737 tree fn
= OVL_FIRST (fns
);
14738 bool ok
= mark_used (fn
, complain
);
14739 if (!ok
&& !(complain
& tf_error
))
14740 return error_mark_node
;
14741 if (ok
&& BASELINK_P (baselink
))
14742 /* We might have instantiated an auto function. */
14743 TREE_TYPE (baselink
) = TREE_TYPE (fn
);
14746 if (BASELINK_P (baselink
))
14748 /* Add back the template arguments, if present. */
14750 BASELINK_FUNCTIONS (baselink
)
14751 = build2 (TEMPLATE_ID_EXPR
, unknown_type_node
, fns
, template_args
);
14753 /* Update the conversion operator type. */
14754 BASELINK_OPTYPE (baselink
) = optype
;
14758 object_type
= current_class_type
;
14760 if (qualified_p
|| !dependent_p
)
14762 baselink
= adjust_result_of_qualified_name_lookup (baselink
,
14766 /* We need to call adjust_result_of_qualified_name_lookup in case the
14767 destructor names a base class, but we unset BASELINK_QUALIFIED_P
14768 so that we still get virtual function binding. */
14769 BASELINK_QUALIFIED_P (baselink
) = false;
14775 /* Like tsubst_expr for a SCOPE_REF, given by QUALIFIED_ID. DONE is
14776 true if the qualified-id will be a postfix-expression in-and-of
14777 itself; false if more of the postfix-expression follows the
14778 QUALIFIED_ID. ADDRESS_P is true if the qualified-id is the operand
14782 tsubst_qualified_id (tree qualified_id
, tree args
,
14783 tsubst_flags_t complain
, tree in_decl
,
14784 bool done
, bool address_p
)
14790 tree template_args
;
14791 location_t loc
= UNKNOWN_LOCATION
;
14793 gcc_assert (TREE_CODE (qualified_id
) == SCOPE_REF
);
14795 /* Figure out what name to look up. */
14796 name
= TREE_OPERAND (qualified_id
, 1);
14797 if (TREE_CODE (name
) == TEMPLATE_ID_EXPR
)
14799 is_template
= true;
14800 loc
= EXPR_LOCATION (name
);
14801 template_args
= TREE_OPERAND (name
, 1);
14803 template_args
= tsubst_template_args (template_args
, args
,
14804 complain
, in_decl
);
14805 if (template_args
== error_mark_node
)
14806 return error_mark_node
;
14807 name
= TREE_OPERAND (name
, 0);
14811 is_template
= false;
14812 template_args
= NULL_TREE
;
14815 /* Substitute into the qualifying scope. When there are no ARGS, we
14816 are just trying to simplify a non-dependent expression. In that
14817 case the qualifying scope may be dependent, and, in any case,
14818 substituting will not help. */
14819 scope
= TREE_OPERAND (qualified_id
, 0);
14822 scope
= tsubst (scope
, args
, complain
, in_decl
);
14823 expr
= tsubst_copy (name
, args
, complain
, in_decl
);
14828 if (dependent_scope_p (scope
))
14831 expr
= build_min_nt_loc (loc
, TEMPLATE_ID_EXPR
, expr
, template_args
);
14832 tree r
= build_qualified_name (NULL_TREE
, scope
, expr
,
14833 QUALIFIED_NAME_IS_TEMPLATE (qualified_id
));
14834 REF_PARENTHESIZED_P (r
) = REF_PARENTHESIZED_P (qualified_id
);
14838 if (!BASELINK_P (name
) && !DECL_P (expr
))
14840 if (TREE_CODE (expr
) == BIT_NOT_EXPR
)
14842 /* A BIT_NOT_EXPR is used to represent a destructor. */
14843 if (!check_dtor_name (scope
, TREE_OPERAND (expr
, 0)))
14845 error ("qualifying type %qT does not match destructor name ~%qT",
14846 scope
, TREE_OPERAND (expr
, 0));
14847 expr
= error_mark_node
;
14850 expr
= lookup_qualified_name (scope
, complete_dtor_identifier
,
14851 /*is_type_p=*/0, false);
14854 expr
= lookup_qualified_name (scope
, expr
, /*is_type_p=*/0, false);
14855 if (TREE_CODE (TREE_CODE (expr
) == TEMPLATE_DECL
14856 ? DECL_TEMPLATE_RESULT (expr
) : expr
) == TYPE_DECL
)
14858 if (complain
& tf_error
)
14860 error ("dependent-name %qE is parsed as a non-type, but "
14861 "instantiation yields a type", qualified_id
);
14862 inform (input_location
, "say %<typename %E%> if a type is meant", qualified_id
);
14864 return error_mark_node
;
14870 check_accessibility_of_qualified_id (expr
, /*object_type=*/NULL_TREE
,
14872 /* Remember that there was a reference to this entity. */
14873 if (!mark_used (expr
, complain
) && !(complain
& tf_error
))
14874 return error_mark_node
;
14877 if (expr
== error_mark_node
|| TREE_CODE (expr
) == TREE_LIST
)
14879 if (complain
& tf_error
)
14880 qualified_name_lookup_error (scope
,
14881 TREE_OPERAND (qualified_id
, 1),
14882 expr
, input_location
);
14883 return error_mark_node
;
14888 if (variable_template_p (expr
))
14889 expr
= lookup_and_finish_template_variable (expr
, template_args
,
14892 expr
= lookup_template_function (expr
, template_args
);
14895 if (expr
== error_mark_node
&& complain
& tf_error
)
14896 qualified_name_lookup_error (scope
, TREE_OPERAND (qualified_id
, 1),
14897 expr
, input_location
);
14898 else if (TYPE_P (scope
))
14900 expr
= (adjust_result_of_qualified_name_lookup
14901 (expr
, scope
, current_nonlambda_class_type ()));
14902 expr
= (finish_qualified_id_expr
14903 (scope
, expr
, done
, address_p
&& PTRMEM_OK_P (qualified_id
),
14904 QUALIFIED_NAME_IS_TEMPLATE (qualified_id
),
14905 /*template_arg_p=*/false, complain
));
14908 /* Expressions do not generally have reference type. */
14909 if (TREE_CODE (expr
) != SCOPE_REF
14910 /* However, if we're about to form a pointer-to-member, we just
14911 want the referenced member referenced. */
14912 && TREE_CODE (expr
) != OFFSET_REF
)
14913 expr
= convert_from_reference (expr
);
14915 if (REF_PARENTHESIZED_P (qualified_id
))
14916 expr
= force_paren_expr (expr
);
14921 /* tsubst the initializer for a VAR_DECL. INIT is the unsubstituted
14922 initializer, DECL is the substituted VAR_DECL. Other arguments are as
14926 tsubst_init (tree init
, tree decl
, tree args
,
14927 tsubst_flags_t complain
, tree in_decl
)
14932 init
= tsubst_expr (init
, args
, complain
, in_decl
, false);
14934 if (!init
&& TREE_TYPE (decl
) != error_mark_node
)
14936 /* If we had an initializer but it
14937 instantiated to nothing,
14938 value-initialize the object. This will
14939 only occur when the initializer was a
14940 pack expansion where the parameter packs
14941 used in that expansion were of length
14943 init
= build_value_init (TREE_TYPE (decl
),
14945 if (TREE_CODE (init
) == AGGR_INIT_EXPR
)
14946 init
= get_target_expr_sfinae (init
, complain
);
14947 if (TREE_CODE (init
) == TARGET_EXPR
)
14948 TARGET_EXPR_DIRECT_INIT_P (init
) = true;
14954 /* Like tsubst, but deals with expressions. This function just replaces
14955 template parms; to finish processing the resultant expression, use
14956 tsubst_copy_and_build or tsubst_expr. */
14959 tsubst_copy (tree t
, tree args
, tsubst_flags_t complain
, tree in_decl
)
14961 enum tree_code code
;
14964 if (t
== NULL_TREE
|| t
== error_mark_node
|| args
== NULL_TREE
)
14967 code
= TREE_CODE (t
);
14972 r
= retrieve_local_specialization (t
);
14974 if (r
== NULL_TREE
)
14976 /* We get here for a use of 'this' in an NSDMI. */
14977 if (DECL_NAME (t
) == this_identifier
&& current_class_ptr
)
14978 return current_class_ptr
;
14980 /* This can happen for a parameter name used later in a function
14981 declaration (such as in a late-specified return type). Just
14982 make a dummy decl, since it's only used for its type. */
14983 gcc_assert (cp_unevaluated_operand
!= 0);
14984 r
= tsubst_decl (t
, args
, complain
);
14985 /* Give it the template pattern as its context; its true context
14986 hasn't been instantiated yet and this is good enough for
14988 DECL_CONTEXT (r
) = DECL_CONTEXT (t
);
14991 if (TREE_CODE (r
) == ARGUMENT_PACK_SELECT
)
14992 r
= argument_pack_select_arg (r
);
14993 if (!mark_used (r
, complain
) && !(complain
& tf_error
))
14994 return error_mark_node
;
15002 if (DECL_TEMPLATE_PARM_P (t
))
15003 return tsubst_copy (DECL_INITIAL (t
), args
, complain
, in_decl
);
15004 /* There is no need to substitute into namespace-scope
15006 if (DECL_NAMESPACE_SCOPE_P (t
))
15008 /* If ARGS is NULL, then T is known to be non-dependent. */
15009 if (args
== NULL_TREE
)
15010 return scalar_constant_value (t
);
15012 /* Unfortunately, we cannot just call lookup_name here.
15015 template <int I> int f() {
15017 struct S { void g() { E e = a; } };
15020 When we instantiate f<7>::S::g(), say, lookup_name is not
15021 clever enough to find f<7>::a. */
15023 = tsubst_aggr_type (DECL_CONTEXT (t
), args
, complain
, in_decl
,
15024 /*entering_scope=*/0);
15026 for (v
= TYPE_VALUES (enum_type
);
15028 v
= TREE_CHAIN (v
))
15029 if (TREE_PURPOSE (v
) == DECL_NAME (t
))
15030 return TREE_VALUE (v
);
15032 /* We didn't find the name. That should never happen; if
15033 name-lookup found it during preliminary parsing, we
15034 should find it again here during instantiation. */
15035 gcc_unreachable ();
15040 if (DECL_CONTEXT (t
))
15044 ctx
= tsubst_aggr_type (DECL_CONTEXT (t
), args
, complain
, in_decl
,
15045 /*entering_scope=*/1);
15046 if (ctx
!= DECL_CONTEXT (t
))
15048 tree r
= lookup_field (ctx
, DECL_NAME (t
), 0, false);
15051 if (complain
& tf_error
)
15052 error ("using invalid field %qD", t
);
15053 return error_mark_node
;
15062 case FUNCTION_DECL
:
15063 if (DECL_LANG_SPECIFIC (t
) && DECL_TEMPLATE_INFO (t
))
15064 r
= tsubst (t
, args
, complain
, in_decl
);
15065 else if (local_variable_p (t
)
15066 && uses_template_parms (DECL_CONTEXT (t
)))
15068 r
= retrieve_local_specialization (t
);
15069 if (r
== NULL_TREE
)
15071 /* First try name lookup to find the instantiation. */
15072 r
= lookup_name (DECL_NAME (t
));
15073 if (r
&& !is_capture_proxy (r
))
15075 /* Make sure that the one we found is the one we want. */
15076 tree ctx
= enclosing_instantiation_of (DECL_CONTEXT (t
));
15077 if (ctx
!= DECL_CONTEXT (r
))
15085 /* This can happen for a variable used in a
15086 late-specified return type of a local lambda, or for a
15087 local static or constant. Building a new VAR_DECL
15088 should be OK in all those cases. */
15089 r
= tsubst_decl (t
, args
, complain
);
15090 if (local_specializations
)
15091 /* Avoid infinite recursion (79640). */
15092 register_local_specialization (r
, t
);
15093 if (decl_maybe_constant_var_p (r
))
15095 /* We can't call cp_finish_decl, so handle the
15096 initializer by hand. */
15097 tree init
= tsubst_init (DECL_INITIAL (t
), r
, args
,
15098 complain
, in_decl
);
15099 if (!processing_template_decl
)
15100 init
= maybe_constant_init (init
);
15101 if (processing_template_decl
15102 ? potential_constant_expression (init
)
15103 : reduced_constant_expression_p (init
))
15104 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (r
)
15105 = TREE_CONSTANT (r
) = true;
15106 DECL_INITIAL (r
) = init
;
15107 if (tree auto_node
= type_uses_auto (TREE_TYPE (r
)))
15109 = do_auto_deduction (TREE_TYPE (r
), init
, auto_node
,
15110 complain
, adc_variable_type
);
15112 gcc_assert (cp_unevaluated_operand
|| TREE_STATIC (r
)
15113 || decl_constant_var_p (r
)
15114 || errorcount
|| sorrycount
);
15115 if (!processing_template_decl
15116 && !TREE_STATIC (r
))
15117 r
= process_outer_var_ref (r
, complain
);
15119 /* Remember this for subsequent uses. */
15120 if (local_specializations
)
15121 register_local_specialization (r
, t
);
15123 if (TREE_CODE (r
) == ARGUMENT_PACK_SELECT
)
15124 r
= argument_pack_select_arg (r
);
15128 if (!mark_used (r
, complain
))
15129 return error_mark_node
;
15132 case NAMESPACE_DECL
:
15136 /* An OVERLOAD will always be a non-dependent overload set; an
15137 overload set from function scope will just be represented with an
15138 IDENTIFIER_NODE, and from class scope with a BASELINK. */
15139 gcc_assert (!uses_template_parms (t
));
15140 /* We must have marked any lookups as persistent. */
15141 gcc_assert (!OVL_LOOKUP_P (t
) || OVL_USED_P (t
));
15145 return tsubst_baselink (t
, current_nonlambda_class_type (),
15146 args
, complain
, in_decl
);
15148 case TEMPLATE_DECL
:
15149 if (DECL_TEMPLATE_TEMPLATE_PARM_P (t
))
15150 return tsubst (TREE_TYPE (DECL_TEMPLATE_RESULT (t
)),
15151 args
, complain
, in_decl
);
15152 else if (DECL_FUNCTION_TEMPLATE_P (t
) && DECL_MEMBER_TEMPLATE_P (t
))
15153 return tsubst (t
, args
, complain
, in_decl
);
15154 else if (DECL_CLASS_SCOPE_P (t
)
15155 && uses_template_parms (DECL_CONTEXT (t
)))
15157 /* Template template argument like the following example need
15160 template <template <class> class TT> struct C {};
15161 template <class T> struct D {
15162 template <class U> struct E {};
15167 We are processing the template argument `E' in #1 for
15168 the template instantiation #2. Originally, `E' is a
15169 TEMPLATE_DECL with `D<T>' as its DECL_CONTEXT. Now we
15170 have to substitute this with one having context `D<int>'. */
15172 tree context
= tsubst (DECL_CONTEXT (t
), args
, complain
, in_decl
);
15173 if (dependent_scope_p (context
))
15175 /* When rewriting a constructor into a deduction guide, a
15176 non-dependent name can become dependent, so memtmpl<args>
15177 becomes context::template memtmpl<args>. */
15178 tree type
= tsubst (TREE_TYPE (t
), args
, complain
, in_decl
);
15179 return build_qualified_name (type
, context
, DECL_NAME (t
),
15182 return lookup_field (context
, DECL_NAME(t
), 0, false);
15185 /* Ordinary template template argument. */
15188 case NON_LVALUE_EXPR
:
15189 case VIEW_CONVERT_EXPR
:
15191 /* Handle location wrappers by substituting the wrapped node
15192 first, *then* reusing the resulting type. Doing the type
15193 first ensures that we handle template parameters and
15194 parameter pack expansions. */
15195 gcc_assert (location_wrapper_p (t
));
15196 tree op0
= tsubst_copy (TREE_OPERAND (t
, 0), args
, complain
, in_decl
);
15197 return maybe_wrap_with_location (op0
, EXPR_LOCATION (t
));
15201 case REINTERPRET_CAST_EXPR
:
15202 case CONST_CAST_EXPR
:
15203 case STATIC_CAST_EXPR
:
15204 case DYNAMIC_CAST_EXPR
:
15205 case IMPLICIT_CONV_EXPR
:
15209 tree type
= tsubst (TREE_TYPE (t
), args
, complain
, in_decl
);
15210 tree op0
= tsubst_copy (TREE_OPERAND (t
, 0), args
, complain
, in_decl
);
15211 return build1 (code
, type
, op0
);
15215 if (PACK_EXPANSION_P (TREE_OPERAND (t
, 0))
15216 || ARGUMENT_PACK_P (TREE_OPERAND (t
, 0)))
15218 tree expanded
, op
= TREE_OPERAND (t
, 0);
15221 if (SIZEOF_EXPR_TYPE_P (t
))
15222 op
= TREE_TYPE (op
);
15224 ++cp_unevaluated_operand
;
15225 ++c_inhibit_evaluation_warnings
;
15226 /* We only want to compute the number of arguments. */
15227 if (PACK_EXPANSION_P (op
))
15228 expanded
= tsubst_pack_expansion (op
, args
, complain
, in_decl
);
15230 expanded
= tsubst_template_args (ARGUMENT_PACK_ARGS (op
),
15231 args
, complain
, in_decl
);
15232 --cp_unevaluated_operand
;
15233 --c_inhibit_evaluation_warnings
;
15235 if (TREE_CODE (expanded
) == TREE_VEC
)
15237 len
= TREE_VEC_LENGTH (expanded
);
15238 /* Set TREE_USED for the benefit of -Wunused. */
15239 for (int i
= 0; i
< len
; i
++)
15240 if (DECL_P (TREE_VEC_ELT (expanded
, i
)))
15241 TREE_USED (TREE_VEC_ELT (expanded
, i
)) = true;
15244 if (expanded
== error_mark_node
)
15245 return error_mark_node
;
15246 else if (PACK_EXPANSION_P (expanded
)
15247 || (TREE_CODE (expanded
) == TREE_VEC
15248 && pack_expansion_args_count (expanded
)))
15251 if (PACK_EXPANSION_P (expanded
))
15253 else if (TREE_VEC_LENGTH (expanded
) == 1)
15254 expanded
= TREE_VEC_ELT (expanded
, 0);
15256 expanded
= make_argument_pack (expanded
);
15258 if (TYPE_P (expanded
))
15259 return cxx_sizeof_or_alignof_type (expanded
, SIZEOF_EXPR
,
15260 complain
& tf_error
);
15262 return cxx_sizeof_or_alignof_expr (expanded
, SIZEOF_EXPR
,
15263 complain
& tf_error
);
15266 return build_int_cst (size_type_node
, len
);
15268 if (SIZEOF_EXPR_TYPE_P (t
))
15270 r
= tsubst (TREE_TYPE (TREE_OPERAND (t
, 0)),
15271 args
, complain
, in_decl
);
15272 r
= build1 (NOP_EXPR
, r
, error_mark_node
);
15273 r
= build1 (SIZEOF_EXPR
,
15274 tsubst (TREE_TYPE (t
), args
, complain
, in_decl
), r
);
15275 SIZEOF_EXPR_TYPE_P (r
) = 1;
15282 case TRUTH_NOT_EXPR
:
15285 case UNARY_PLUS_EXPR
: /* Unary + */
15287 case AT_ENCODE_EXPR
:
15291 case REALPART_EXPR
:
15292 case IMAGPART_EXPR
:
15295 tree type
= tsubst (TREE_TYPE (t
), args
, complain
, in_decl
);
15296 tree op0
= tsubst_copy (TREE_OPERAND (t
, 0), args
, complain
, in_decl
);
15297 return build1 (code
, type
, op0
);
15300 case COMPONENT_REF
:
15305 object
= tsubst_copy (TREE_OPERAND (t
, 0), args
, complain
, in_decl
);
15306 name
= TREE_OPERAND (t
, 1);
15307 if (TREE_CODE (name
) == BIT_NOT_EXPR
)
15309 name
= tsubst_copy (TREE_OPERAND (name
, 0), args
,
15310 complain
, in_decl
);
15311 name
= build1 (BIT_NOT_EXPR
, NULL_TREE
, name
);
15313 else if (TREE_CODE (name
) == SCOPE_REF
15314 && TREE_CODE (TREE_OPERAND (name
, 1)) == BIT_NOT_EXPR
)
15316 tree base
= tsubst_copy (TREE_OPERAND (name
, 0), args
,
15317 complain
, in_decl
);
15318 name
= TREE_OPERAND (name
, 1);
15319 name
= tsubst_copy (TREE_OPERAND (name
, 0), args
,
15320 complain
, in_decl
);
15321 name
= build1 (BIT_NOT_EXPR
, NULL_TREE
, name
);
15322 name
= build_qualified_name (/*type=*/NULL_TREE
,
15324 /*template_p=*/false);
15326 else if (BASELINK_P (name
))
15327 name
= tsubst_baselink (name
,
15328 non_reference (TREE_TYPE (object
)),
15332 name
= tsubst_copy (name
, args
, complain
, in_decl
);
15333 return build_nt (COMPONENT_REF
, object
, name
, NULL_TREE
);
15339 case TRUNC_DIV_EXPR
:
15340 case CEIL_DIV_EXPR
:
15341 case FLOOR_DIV_EXPR
:
15342 case ROUND_DIV_EXPR
:
15343 case EXACT_DIV_EXPR
:
15347 case TRUNC_MOD_EXPR
:
15348 case FLOOR_MOD_EXPR
:
15349 case TRUTH_ANDIF_EXPR
:
15350 case TRUTH_ORIF_EXPR
:
15351 case TRUTH_AND_EXPR
:
15352 case TRUTH_OR_EXPR
:
15365 case COMPOUND_EXPR
:
15368 case PREDECREMENT_EXPR
:
15369 case PREINCREMENT_EXPR
:
15370 case POSTDECREMENT_EXPR
:
15371 case POSTINCREMENT_EXPR
:
15373 tree op0
= tsubst_copy (TREE_OPERAND (t
, 0), args
, complain
, in_decl
);
15374 tree op1
= tsubst_copy (TREE_OPERAND (t
, 1), args
, complain
, in_decl
);
15375 return build_nt (code
, op0
, op1
);
15380 tree op0
= tsubst_copy (TREE_OPERAND (t
, 0), args
, complain
, in_decl
);
15381 tree op1
= tsubst_copy (TREE_OPERAND (t
, 1), args
, complain
, in_decl
);
15382 return build_qualified_name (/*type=*/NULL_TREE
, op0
, op1
,
15383 QUALIFIED_NAME_IS_TEMPLATE (t
));
15388 tree op0
= tsubst_copy (TREE_OPERAND (t
, 0), args
, complain
, in_decl
);
15389 tree op1
= tsubst_copy (TREE_OPERAND (t
, 1), args
, complain
, in_decl
);
15390 return build_nt (ARRAY_REF
, op0
, op1
, NULL_TREE
, NULL_TREE
);
15395 int n
= VL_EXP_OPERAND_LENGTH (t
);
15396 tree result
= build_vl_exp (CALL_EXPR
, n
);
15398 for (i
= 0; i
< n
; i
++)
15399 TREE_OPERAND (t
, i
) = tsubst_copy (TREE_OPERAND (t
, i
), args
,
15400 complain
, in_decl
);
15406 case PSEUDO_DTOR_EXPR
:
15407 case VEC_PERM_EXPR
:
15409 tree op0
= tsubst_copy (TREE_OPERAND (t
, 0), args
, complain
, in_decl
);
15410 tree op1
= tsubst_copy (TREE_OPERAND (t
, 1), args
, complain
, in_decl
);
15411 tree op2
= tsubst_copy (TREE_OPERAND (t
, 2), args
, complain
, in_decl
);
15412 r
= build_nt (code
, op0
, op1
, op2
);
15413 TREE_NO_WARNING (r
) = TREE_NO_WARNING (t
);
15419 tree op0
= tsubst_copy (TREE_OPERAND (t
, 0), args
, complain
, in_decl
);
15420 tree op1
= tsubst_copy (TREE_OPERAND (t
, 1), args
, complain
, in_decl
);
15421 tree op2
= tsubst_copy (TREE_OPERAND (t
, 2), args
, complain
, in_decl
);
15422 r
= build_nt (code
, op0
, op1
, op2
);
15423 NEW_EXPR_USE_GLOBAL (r
) = NEW_EXPR_USE_GLOBAL (t
);
15429 tree op0
= tsubst_copy (TREE_OPERAND (t
, 0), args
, complain
, in_decl
);
15430 tree op1
= tsubst_copy (TREE_OPERAND (t
, 1), args
, complain
, in_decl
);
15431 r
= build_nt (code
, op0
, op1
);
15432 DELETE_EXPR_USE_GLOBAL (r
) = DELETE_EXPR_USE_GLOBAL (t
);
15433 DELETE_EXPR_USE_VEC (r
) = DELETE_EXPR_USE_VEC (t
);
15437 case TEMPLATE_ID_EXPR
:
15439 /* Substituted template arguments */
15440 tree fn
= TREE_OPERAND (t
, 0);
15441 tree targs
= TREE_OPERAND (t
, 1);
15443 fn
= tsubst_copy (fn
, args
, complain
, in_decl
);
15445 targs
= tsubst_template_args (targs
, args
, complain
, in_decl
);
15447 return lookup_template_function (fn
, targs
);
15452 tree purpose
, value
, chain
;
15454 if (t
== void_list_node
)
15457 purpose
= TREE_PURPOSE (t
);
15459 purpose
= tsubst_copy (purpose
, args
, complain
, in_decl
);
15460 value
= TREE_VALUE (t
);
15462 value
= tsubst_copy (value
, args
, complain
, in_decl
);
15463 chain
= TREE_CHAIN (t
);
15464 if (chain
&& chain
!= void_type_node
)
15465 chain
= tsubst_copy (chain
, args
, complain
, in_decl
);
15466 if (purpose
== TREE_PURPOSE (t
)
15467 && value
== TREE_VALUE (t
)
15468 && chain
== TREE_CHAIN (t
))
15470 return tree_cons (purpose
, value
, chain
);
15475 case ENUMERAL_TYPE
:
15477 case TEMPLATE_TYPE_PARM
:
15478 case TEMPLATE_TEMPLATE_PARM
:
15479 case BOUND_TEMPLATE_TEMPLATE_PARM
:
15480 case TEMPLATE_PARM_INDEX
:
15482 case REFERENCE_TYPE
:
15484 case FUNCTION_TYPE
:
15487 case TYPENAME_TYPE
:
15488 case UNBOUND_CLASS_TEMPLATE
:
15490 case DECLTYPE_TYPE
:
15492 return tsubst (t
, args
, complain
, in_decl
);
15496 /* Fall through. */
15497 case IDENTIFIER_NODE
:
15498 if (IDENTIFIER_CONV_OP_P (t
))
15500 tree new_type
= tsubst (TREE_TYPE (t
), args
, complain
, in_decl
);
15501 return make_conv_op_name (new_type
);
15507 /* This is handled by tsubst_copy_and_build. */
15508 gcc_unreachable ();
15512 tree op0
= tsubst_copy (TREE_OPERAND (t
, 0), args
, complain
, in_decl
);
15513 tree type
= tsubst (TREE_TYPE (t
), args
, complain
, in_decl
);
15514 return build_x_va_arg (EXPR_LOCATION (t
), op0
, type
);
15517 case CLEANUP_POINT_EXPR
:
15518 /* We shouldn't have built any of these during initial template
15519 generation. Instead, they should be built during instantiation
15520 in response to the saved STMT_IS_FULL_EXPR_P setting. */
15521 gcc_unreachable ();
15525 tree type
= tsubst (TREE_TYPE (t
), args
, complain
, in_decl
);
15526 tree op0
= tsubst_copy (TREE_OPERAND (t
, 0), args
, complain
, in_decl
);
15527 tree op1
= tsubst_copy (TREE_OPERAND (t
, 1), args
, complain
, in_decl
);
15528 r
= build2 (code
, type
, op0
, op1
);
15529 PTRMEM_OK_P (r
) = PTRMEM_OK_P (t
);
15530 if (!mark_used (TREE_OPERAND (r
, 1), complain
)
15531 && !(complain
& tf_error
))
15532 return error_mark_node
;
15536 case EXPR_PACK_EXPANSION
:
15537 error ("invalid use of pack expansion expression");
15538 return error_mark_node
;
15540 case NONTYPE_ARGUMENT_PACK
:
15541 error ("use %<...%> to expand argument pack");
15542 return error_mark_node
;
15545 gcc_checking_assert (t
== void_node
&& VOID_TYPE_P (TREE_TYPE (t
)));
15553 /* Instantiate any typedefs in the type. */
15554 tree type
= tsubst (TREE_TYPE (t
), args
, complain
, in_decl
);
15555 r
= fold_convert (type
, t
);
15556 gcc_assert (TREE_CODE (r
) == code
);
15561 /* These can sometimes show up in a partial instantiation, but never
15562 involve template parms. */
15563 gcc_assert (!uses_template_parms (t
));
15566 case UNARY_LEFT_FOLD_EXPR
:
15567 return tsubst_unary_left_fold (t
, args
, complain
, in_decl
);
15568 case UNARY_RIGHT_FOLD_EXPR
:
15569 return tsubst_unary_right_fold (t
, args
, complain
, in_decl
);
15570 case BINARY_LEFT_FOLD_EXPR
:
15571 return tsubst_binary_left_fold (t
, args
, complain
, in_decl
);
15572 case BINARY_RIGHT_FOLD_EXPR
:
15573 return tsubst_binary_right_fold (t
, args
, complain
, in_decl
);
15577 case DEBUG_BEGIN_STMT
:
15578 /* ??? There's no point in copying it for now, but maybe some
15579 day it will contain more information, such as a pointer back
15580 to the containing function, inlined copy or so. */
15584 /* We shouldn't get here, but keep going if !flag_checking. */
15586 gcc_unreachable ();
15591 /* Helper function for tsubst_omp_clauses, used for instantiation of
15592 OMP_CLAUSE_DECL of clauses. */
15595 tsubst_omp_clause_decl (tree decl
, tree args
, tsubst_flags_t complain
,
15598 if (decl
== NULL_TREE
)
15601 /* Handle an OpenMP array section represented as a TREE_LIST (or
15602 OMP_CLAUSE_DEPEND_KIND). An OMP_CLAUSE_DEPEND (with a depend
15603 kind of OMP_CLAUSE_DEPEND_SINK) can also be represented as a
15604 TREE_LIST. We can handle it exactly the same as an array section
15605 (purpose, value, and a chain), even though the nomenclature
15606 (low_bound, length, etc) is different. */
15607 if (TREE_CODE (decl
) == TREE_LIST
)
15610 = tsubst_expr (TREE_PURPOSE (decl
), args
, complain
, in_decl
,
15611 /*integral_constant_expression_p=*/false);
15612 tree length
= tsubst_expr (TREE_VALUE (decl
), args
, complain
, in_decl
,
15613 /*integral_constant_expression_p=*/false);
15614 tree chain
= tsubst_omp_clause_decl (TREE_CHAIN (decl
), args
, complain
,
15616 if (TREE_PURPOSE (decl
) == low_bound
15617 && TREE_VALUE (decl
) == length
15618 && TREE_CHAIN (decl
) == chain
)
15620 tree ret
= tree_cons (low_bound
, length
, chain
);
15621 OMP_CLAUSE_DEPEND_SINK_NEGATIVE (ret
)
15622 = OMP_CLAUSE_DEPEND_SINK_NEGATIVE (decl
);
15625 tree ret
= tsubst_expr (decl
, args
, complain
, in_decl
,
15626 /*integral_constant_expression_p=*/false);
15627 /* Undo convert_from_reference tsubst_expr could have called. */
15629 && REFERENCE_REF_P (ret
)
15630 && !REFERENCE_REF_P (decl
))
15631 ret
= TREE_OPERAND (ret
, 0);
15635 /* Like tsubst_copy, but specifically for OpenMP clauses. */
15638 tsubst_omp_clauses (tree clauses
, enum c_omp_region_type ort
,
15639 tree args
, tsubst_flags_t complain
, tree in_decl
)
15641 tree new_clauses
= NULL_TREE
, nc
, oc
;
15642 tree linear_no_step
= NULL_TREE
;
15644 for (oc
= clauses
; oc
; oc
= OMP_CLAUSE_CHAIN (oc
))
15646 nc
= copy_node (oc
);
15647 OMP_CLAUSE_CHAIN (nc
) = new_clauses
;
15650 switch (OMP_CLAUSE_CODE (nc
))
15652 case OMP_CLAUSE_LASTPRIVATE
:
15653 if (OMP_CLAUSE_LASTPRIVATE_STMT (oc
))
15655 OMP_CLAUSE_LASTPRIVATE_STMT (nc
) = push_stmt_list ();
15656 tsubst_expr (OMP_CLAUSE_LASTPRIVATE_STMT (oc
), args
, complain
,
15657 in_decl
, /*integral_constant_expression_p=*/false);
15658 OMP_CLAUSE_LASTPRIVATE_STMT (nc
)
15659 = pop_stmt_list (OMP_CLAUSE_LASTPRIVATE_STMT (nc
));
15662 case OMP_CLAUSE_PRIVATE
:
15663 case OMP_CLAUSE_SHARED
:
15664 case OMP_CLAUSE_FIRSTPRIVATE
:
15665 case OMP_CLAUSE_COPYIN
:
15666 case OMP_CLAUSE_COPYPRIVATE
:
15667 case OMP_CLAUSE_UNIFORM
:
15668 case OMP_CLAUSE_DEPEND
:
15669 case OMP_CLAUSE_FROM
:
15670 case OMP_CLAUSE_TO
:
15671 case OMP_CLAUSE_MAP
:
15672 case OMP_CLAUSE_USE_DEVICE_PTR
:
15673 case OMP_CLAUSE_IS_DEVICE_PTR
:
15674 OMP_CLAUSE_DECL (nc
)
15675 = tsubst_omp_clause_decl (OMP_CLAUSE_DECL (oc
), args
, complain
,
15678 case OMP_CLAUSE_TILE
:
15679 case OMP_CLAUSE_IF
:
15680 case OMP_CLAUSE_NUM_THREADS
:
15681 case OMP_CLAUSE_SCHEDULE
:
15682 case OMP_CLAUSE_COLLAPSE
:
15683 case OMP_CLAUSE_FINAL
:
15684 case OMP_CLAUSE_DEVICE
:
15685 case OMP_CLAUSE_DIST_SCHEDULE
:
15686 case OMP_CLAUSE_NUM_TEAMS
:
15687 case OMP_CLAUSE_THREAD_LIMIT
:
15688 case OMP_CLAUSE_SAFELEN
:
15689 case OMP_CLAUSE_SIMDLEN
:
15690 case OMP_CLAUSE_NUM_TASKS
:
15691 case OMP_CLAUSE_GRAINSIZE
:
15692 case OMP_CLAUSE_PRIORITY
:
15693 case OMP_CLAUSE_ORDERED
:
15694 case OMP_CLAUSE_HINT
:
15695 case OMP_CLAUSE_NUM_GANGS
:
15696 case OMP_CLAUSE_NUM_WORKERS
:
15697 case OMP_CLAUSE_VECTOR_LENGTH
:
15698 case OMP_CLAUSE_WORKER
:
15699 case OMP_CLAUSE_VECTOR
:
15700 case OMP_CLAUSE_ASYNC
:
15701 case OMP_CLAUSE_WAIT
:
15702 OMP_CLAUSE_OPERAND (nc
, 0)
15703 = tsubst_expr (OMP_CLAUSE_OPERAND (oc
, 0), args
, complain
,
15704 in_decl
, /*integral_constant_expression_p=*/false);
15706 case OMP_CLAUSE_REDUCTION
:
15707 if (OMP_CLAUSE_REDUCTION_PLACEHOLDER (oc
))
15709 tree placeholder
= OMP_CLAUSE_REDUCTION_PLACEHOLDER (oc
);
15710 if (TREE_CODE (placeholder
) == SCOPE_REF
)
15712 tree scope
= tsubst (TREE_OPERAND (placeholder
, 0), args
,
15713 complain
, in_decl
);
15714 OMP_CLAUSE_REDUCTION_PLACEHOLDER (nc
)
15715 = build_qualified_name (NULL_TREE
, scope
,
15716 TREE_OPERAND (placeholder
, 1),
15720 gcc_assert (identifier_p (placeholder
));
15722 OMP_CLAUSE_DECL (nc
)
15723 = tsubst_omp_clause_decl (OMP_CLAUSE_DECL (oc
), args
, complain
,
15726 case OMP_CLAUSE_GANG
:
15727 case OMP_CLAUSE_ALIGNED
:
15728 OMP_CLAUSE_DECL (nc
)
15729 = tsubst_omp_clause_decl (OMP_CLAUSE_DECL (oc
), args
, complain
,
15731 OMP_CLAUSE_OPERAND (nc
, 1)
15732 = tsubst_expr (OMP_CLAUSE_OPERAND (oc
, 1), args
, complain
,
15733 in_decl
, /*integral_constant_expression_p=*/false);
15735 case OMP_CLAUSE_LINEAR
:
15736 OMP_CLAUSE_DECL (nc
)
15737 = tsubst_omp_clause_decl (OMP_CLAUSE_DECL (oc
), args
, complain
,
15739 if (OMP_CLAUSE_LINEAR_STEP (oc
) == NULL_TREE
)
15741 gcc_assert (!linear_no_step
);
15742 linear_no_step
= nc
;
15744 else if (OMP_CLAUSE_LINEAR_VARIABLE_STRIDE (oc
))
15745 OMP_CLAUSE_LINEAR_STEP (nc
)
15746 = tsubst_omp_clause_decl (OMP_CLAUSE_LINEAR_STEP (oc
), args
,
15747 complain
, in_decl
);
15749 OMP_CLAUSE_LINEAR_STEP (nc
)
15750 = tsubst_expr (OMP_CLAUSE_LINEAR_STEP (oc
), args
, complain
,
15752 /*integral_constant_expression_p=*/false);
15754 case OMP_CLAUSE_NOWAIT
:
15755 case OMP_CLAUSE_DEFAULT
:
15756 case OMP_CLAUSE_UNTIED
:
15757 case OMP_CLAUSE_MERGEABLE
:
15758 case OMP_CLAUSE_INBRANCH
:
15759 case OMP_CLAUSE_NOTINBRANCH
:
15760 case OMP_CLAUSE_PROC_BIND
:
15761 case OMP_CLAUSE_FOR
:
15762 case OMP_CLAUSE_PARALLEL
:
15763 case OMP_CLAUSE_SECTIONS
:
15764 case OMP_CLAUSE_TASKGROUP
:
15765 case OMP_CLAUSE_NOGROUP
:
15766 case OMP_CLAUSE_THREADS
:
15767 case OMP_CLAUSE_SIMD
:
15768 case OMP_CLAUSE_DEFAULTMAP
:
15769 case OMP_CLAUSE_INDEPENDENT
:
15770 case OMP_CLAUSE_AUTO
:
15771 case OMP_CLAUSE_SEQ
:
15774 gcc_unreachable ();
15776 if ((ort
& C_ORT_OMP_DECLARE_SIMD
) == C_ORT_OMP
)
15777 switch (OMP_CLAUSE_CODE (nc
))
15779 case OMP_CLAUSE_SHARED
:
15780 case OMP_CLAUSE_PRIVATE
:
15781 case OMP_CLAUSE_FIRSTPRIVATE
:
15782 case OMP_CLAUSE_LASTPRIVATE
:
15783 case OMP_CLAUSE_COPYPRIVATE
:
15784 case OMP_CLAUSE_LINEAR
:
15785 case OMP_CLAUSE_REDUCTION
:
15786 case OMP_CLAUSE_USE_DEVICE_PTR
:
15787 case OMP_CLAUSE_IS_DEVICE_PTR
:
15788 /* tsubst_expr on SCOPE_REF results in returning
15789 finish_non_static_data_member result. Undo that here. */
15790 if (TREE_CODE (OMP_CLAUSE_DECL (oc
)) == SCOPE_REF
15791 && (TREE_CODE (TREE_OPERAND (OMP_CLAUSE_DECL (oc
), 1))
15792 == IDENTIFIER_NODE
))
15794 tree t
= OMP_CLAUSE_DECL (nc
);
15797 switch (TREE_CODE (v
))
15799 case COMPONENT_REF
:
15803 case POINTER_PLUS_EXPR
:
15804 v
= TREE_OPERAND (v
, 0);
15807 if (DECL_CONTEXT (v
) == current_function_decl
15808 && DECL_ARTIFICIAL (v
)
15809 && DECL_NAME (v
) == this_identifier
)
15810 OMP_CLAUSE_DECL (nc
) = TREE_OPERAND (t
, 1);
15817 else if (VAR_P (OMP_CLAUSE_DECL (oc
))
15818 && DECL_HAS_VALUE_EXPR_P (OMP_CLAUSE_DECL (oc
))
15819 && DECL_ARTIFICIAL (OMP_CLAUSE_DECL (oc
))
15820 && DECL_LANG_SPECIFIC (OMP_CLAUSE_DECL (oc
))
15821 && DECL_OMP_PRIVATIZED_MEMBER (OMP_CLAUSE_DECL (oc
)))
15823 tree decl
= OMP_CLAUSE_DECL (nc
);
15826 retrofit_lang_decl (decl
);
15827 DECL_OMP_PRIVATIZED_MEMBER (decl
) = 1;
15836 new_clauses
= nreverse (new_clauses
);
15837 if (ort
!= C_ORT_OMP_DECLARE_SIMD
)
15839 new_clauses
= finish_omp_clauses (new_clauses
, ort
);
15840 if (linear_no_step
)
15841 for (nc
= new_clauses
; nc
; nc
= OMP_CLAUSE_CHAIN (nc
))
15842 if (nc
== linear_no_step
)
15844 OMP_CLAUSE_LINEAR_STEP (nc
) = NULL_TREE
;
15848 return new_clauses
;
15851 /* Like tsubst_copy_and_build, but unshare TREE_LIST nodes. */
15854 tsubst_copy_asm_operands (tree t
, tree args
, tsubst_flags_t complain
,
15857 #define RECUR(t) tsubst_copy_asm_operands (t, args, complain, in_decl)
15859 tree purpose
, value
, chain
;
15864 if (TREE_CODE (t
) != TREE_LIST
)
15865 return tsubst_copy_and_build (t
, args
, complain
, in_decl
,
15866 /*function_p=*/false,
15867 /*integral_constant_expression_p=*/false);
15869 if (t
== void_list_node
)
15872 purpose
= TREE_PURPOSE (t
);
15874 purpose
= RECUR (purpose
);
15875 value
= TREE_VALUE (t
);
15878 if (TREE_CODE (value
) != LABEL_DECL
)
15879 value
= RECUR (value
);
15882 value
= lookup_label (DECL_NAME (value
));
15883 gcc_assert (TREE_CODE (value
) == LABEL_DECL
);
15884 TREE_USED (value
) = 1;
15887 chain
= TREE_CHAIN (t
);
15888 if (chain
&& chain
!= void_type_node
)
15889 chain
= RECUR (chain
);
15890 return tree_cons (purpose
, value
, chain
);
15894 /* Used to temporarily communicate the list of #pragma omp parallel
15895 clauses to #pragma omp for instantiation if they are combined
15898 static tree
*omp_parallel_combined_clauses
;
15900 /* Substitute one OMP_FOR iterator. */
15903 tsubst_omp_for_iterator (tree t
, int i
, tree declv
, tree orig_declv
,
15904 tree initv
, tree condv
, tree incrv
, tree
*clauses
,
15905 tree args
, tsubst_flags_t complain
, tree in_decl
,
15906 bool integral_constant_expression_p
)
15908 #define RECUR(NODE) \
15909 tsubst_expr ((NODE), args, complain, in_decl, \
15910 integral_constant_expression_p)
15911 tree decl
, init
, cond
, incr
;
15913 init
= TREE_VEC_ELT (OMP_FOR_INIT (t
), i
);
15914 gcc_assert (TREE_CODE (init
) == MODIFY_EXPR
);
15916 if (orig_declv
&& OMP_FOR_ORIG_DECLS (t
))
15918 tree o
= TREE_VEC_ELT (OMP_FOR_ORIG_DECLS (t
), i
);
15919 TREE_VEC_ELT (orig_declv
, i
) = RECUR (o
);
15922 decl
= TREE_OPERAND (init
, 0);
15923 init
= TREE_OPERAND (init
, 1);
15924 tree decl_expr
= NULL_TREE
;
15925 if (init
&& TREE_CODE (init
) == DECL_EXPR
)
15927 /* We need to jump through some hoops to handle declarations in the
15928 init-statement, since we might need to handle auto deduction,
15929 but we need to keep control of initialization. */
15931 init
= DECL_INITIAL (DECL_EXPR_DECL (init
));
15932 decl
= tsubst_decl (decl
, args
, complain
);
15936 if (TREE_CODE (decl
) == SCOPE_REF
)
15938 decl
= RECUR (decl
);
15939 if (TREE_CODE (decl
) == COMPONENT_REF
)
15943 switch (TREE_CODE (v
))
15945 case COMPONENT_REF
:
15949 case POINTER_PLUS_EXPR
:
15950 v
= TREE_OPERAND (v
, 0);
15953 if (DECL_CONTEXT (v
) == current_function_decl
15954 && DECL_ARTIFICIAL (v
)
15955 && DECL_NAME (v
) == this_identifier
)
15957 decl
= TREE_OPERAND (decl
, 1);
15958 decl
= omp_privatize_field (decl
, false);
15968 decl
= RECUR (decl
);
15970 init
= RECUR (init
);
15972 tree auto_node
= type_uses_auto (TREE_TYPE (decl
));
15973 if (auto_node
&& init
)
15975 = do_auto_deduction (TREE_TYPE (decl
), init
, auto_node
, complain
);
15977 gcc_assert (!type_dependent_expression_p (decl
));
15979 if (!CLASS_TYPE_P (TREE_TYPE (decl
)))
15983 /* Declare the variable, but don't let that initialize it. */
15984 tree init_sav
= DECL_INITIAL (DECL_EXPR_DECL (decl_expr
));
15985 DECL_INITIAL (DECL_EXPR_DECL (decl_expr
)) = NULL_TREE
;
15987 DECL_INITIAL (DECL_EXPR_DECL (decl_expr
)) = init_sav
;
15990 cond
= RECUR (TREE_VEC_ELT (OMP_FOR_COND (t
), i
));
15991 incr
= TREE_VEC_ELT (OMP_FOR_INCR (t
), i
);
15992 if (TREE_CODE (incr
) == MODIFY_EXPR
)
15994 tree lhs
= RECUR (TREE_OPERAND (incr
, 0));
15995 tree rhs
= RECUR (TREE_OPERAND (incr
, 1));
15996 incr
= build_x_modify_expr (EXPR_LOCATION (incr
), lhs
,
15997 NOP_EXPR
, rhs
, complain
);
16000 incr
= RECUR (incr
);
16001 TREE_VEC_ELT (declv
, i
) = decl
;
16002 TREE_VEC_ELT (initv
, i
) = init
;
16003 TREE_VEC_ELT (condv
, i
) = cond
;
16004 TREE_VEC_ELT (incrv
, i
) = incr
;
16010 /* Declare and initialize the variable. */
16018 for (j
= (omp_parallel_combined_clauses
== NULL
? 1 : 0); j
< 2; j
++)
16020 for (pc
= j
? clauses
: omp_parallel_combined_clauses
; *pc
; )
16022 if (OMP_CLAUSE_CODE (*pc
) == OMP_CLAUSE_PRIVATE
16023 && OMP_CLAUSE_DECL (*pc
) == decl
)
16025 else if (OMP_CLAUSE_CODE (*pc
) == OMP_CLAUSE_LASTPRIVATE
16026 && OMP_CLAUSE_DECL (*pc
) == decl
)
16030 /* Move lastprivate (decl) clause to OMP_FOR_CLAUSES. */
16032 *pc
= OMP_CLAUSE_CHAIN (c
);
16033 OMP_CLAUSE_CHAIN (c
) = *clauses
;
16036 else if (OMP_CLAUSE_CODE (*pc
) == OMP_CLAUSE_FIRSTPRIVATE
16037 && OMP_CLAUSE_DECL (*pc
) == decl
)
16039 error ("iteration variable %qD should not be firstprivate",
16041 *pc
= OMP_CLAUSE_CHAIN (*pc
);
16043 else if (OMP_CLAUSE_CODE (*pc
) == OMP_CLAUSE_REDUCTION
16044 && OMP_CLAUSE_DECL (*pc
) == decl
)
16046 error ("iteration variable %qD should not be reduction",
16048 *pc
= OMP_CLAUSE_CHAIN (*pc
);
16051 pc
= &OMP_CLAUSE_CHAIN (*pc
);
16056 if (*pc
== NULL_TREE
)
16058 tree c
= build_omp_clause (input_location
, OMP_CLAUSE_PRIVATE
);
16059 OMP_CLAUSE_DECL (c
) = decl
;
16060 c
= finish_omp_clauses (c
, C_ORT_OMP
);
16063 OMP_CLAUSE_CHAIN (c
) = *clauses
;
16068 cond
= TREE_VEC_ELT (OMP_FOR_COND (t
), i
);
16069 if (COMPARISON_CLASS_P (cond
))
16071 tree op0
= RECUR (TREE_OPERAND (cond
, 0));
16072 tree op1
= RECUR (TREE_OPERAND (cond
, 1));
16073 cond
= build2 (TREE_CODE (cond
), boolean_type_node
, op0
, op1
);
16076 cond
= RECUR (cond
);
16077 incr
= TREE_VEC_ELT (OMP_FOR_INCR (t
), i
);
16078 switch (TREE_CODE (incr
))
16080 case PREINCREMENT_EXPR
:
16081 case PREDECREMENT_EXPR
:
16082 case POSTINCREMENT_EXPR
:
16083 case POSTDECREMENT_EXPR
:
16084 incr
= build2 (TREE_CODE (incr
), TREE_TYPE (decl
),
16085 RECUR (TREE_OPERAND (incr
, 0)), NULL_TREE
);
16088 if (TREE_CODE (TREE_OPERAND (incr
, 1)) == PLUS_EXPR
16089 || TREE_CODE (TREE_OPERAND (incr
, 1)) == MINUS_EXPR
)
16091 tree rhs
= TREE_OPERAND (incr
, 1);
16092 tree lhs
= RECUR (TREE_OPERAND (incr
, 0));
16093 tree rhs0
= RECUR (TREE_OPERAND (rhs
, 0));
16094 tree rhs1
= RECUR (TREE_OPERAND (rhs
, 1));
16095 incr
= build2 (MODIFY_EXPR
, TREE_TYPE (decl
), lhs
,
16096 build2 (TREE_CODE (rhs
), TREE_TYPE (decl
),
16100 incr
= RECUR (incr
);
16103 if (TREE_CODE (TREE_OPERAND (incr
, 1)) == PLUS_EXPR
16104 || TREE_CODE (TREE_OPERAND (incr
, 1)) == MINUS_EXPR
)
16106 tree lhs
= RECUR (TREE_OPERAND (incr
, 0));
16107 incr
= build2 (MODIFY_EXPR
, TREE_TYPE (decl
), lhs
,
16108 build2 (TREE_CODE (TREE_OPERAND (incr
, 1)),
16109 TREE_TYPE (decl
), lhs
,
16110 RECUR (TREE_OPERAND (incr
, 2))));
16112 else if (TREE_CODE (TREE_OPERAND (incr
, 1)) == NOP_EXPR
16113 && (TREE_CODE (TREE_OPERAND (incr
, 2)) == PLUS_EXPR
16114 || (TREE_CODE (TREE_OPERAND (incr
, 2)) == MINUS_EXPR
)))
16116 tree rhs
= TREE_OPERAND (incr
, 2);
16117 tree lhs
= RECUR (TREE_OPERAND (incr
, 0));
16118 tree rhs0
= RECUR (TREE_OPERAND (rhs
, 0));
16119 tree rhs1
= RECUR (TREE_OPERAND (rhs
, 1));
16120 incr
= build2 (MODIFY_EXPR
, TREE_TYPE (decl
), lhs
,
16121 build2 (TREE_CODE (rhs
), TREE_TYPE (decl
),
16125 incr
= RECUR (incr
);
16128 incr
= RECUR (incr
);
16132 TREE_VEC_ELT (declv
, i
) = decl
;
16133 TREE_VEC_ELT (initv
, i
) = init
;
16134 TREE_VEC_ELT (condv
, i
) = cond
;
16135 TREE_VEC_ELT (incrv
, i
) = incr
;
16139 /* Helper function of tsubst_expr, find OMP_TEAMS inside
16140 of OMP_TARGET's body. */
16143 tsubst_find_omp_teams (tree
*tp
, int *walk_subtrees
, void *)
16145 *walk_subtrees
= 0;
16146 switch (TREE_CODE (*tp
))
16151 case STATEMENT_LIST
:
16152 *walk_subtrees
= 1;
16160 /* Helper function for tsubst_expr. For decomposition declaration
16161 artificial base DECL, which is tsubsted PATTERN_DECL, tsubst
16162 also the corresponding decls representing the identifiers
16163 of the decomposition declaration. Return DECL if successful
16164 or error_mark_node otherwise, set *FIRST to the first decl
16165 in the list chained through DECL_CHAIN and *CNT to the number
16169 tsubst_decomp_names (tree decl
, tree pattern_decl
, tree args
,
16170 tsubst_flags_t complain
, tree in_decl
, tree
*first
,
16173 tree decl2
, decl3
, prev
= decl
;
16175 gcc_assert (DECL_NAME (decl
) == NULL_TREE
);
16176 for (decl2
= DECL_CHAIN (pattern_decl
);
16179 && DECL_DECOMPOSITION_P (decl2
)
16180 && DECL_NAME (decl2
);
16181 decl2
= DECL_CHAIN (decl2
))
16183 if (TREE_TYPE (decl2
) == error_mark_node
&& *cnt
== 0)
16185 gcc_assert (errorcount
);
16186 return error_mark_node
;
16189 gcc_assert (DECL_DECOMP_BASE (decl2
) == pattern_decl
);
16190 gcc_assert (DECL_HAS_VALUE_EXPR_P (decl2
));
16191 tree v
= DECL_VALUE_EXPR (decl2
);
16192 DECL_HAS_VALUE_EXPR_P (decl2
) = 0;
16193 SET_DECL_VALUE_EXPR (decl2
, NULL_TREE
);
16194 decl3
= tsubst (decl2
, args
, complain
, in_decl
);
16195 SET_DECL_VALUE_EXPR (decl2
, v
);
16196 DECL_HAS_VALUE_EXPR_P (decl2
) = 1;
16198 DECL_TEMPLATE_INSTANTIATED (decl3
) = 1;
16199 maybe_push_decl (decl3
);
16200 if (error_operand_p (decl3
))
16201 decl
= error_mark_node
;
16202 else if (decl
!= error_mark_node
16203 && DECL_CHAIN (decl3
) != prev
)
16205 gcc_assert (errorcount
);
16206 decl
= error_mark_node
;
16215 /* Like tsubst_copy for expressions, etc. but also does semantic
16219 tsubst_expr (tree t
, tree args
, tsubst_flags_t complain
, tree in_decl
,
16220 bool integral_constant_expression_p
)
16222 #define RETURN(EXP) do { r = (EXP); goto out; } while(0)
16223 #define RECUR(NODE) \
16224 tsubst_expr ((NODE), args, complain, in_decl, \
16225 integral_constant_expression_p)
16231 if (t
== NULL_TREE
|| t
== error_mark_node
)
16234 loc
= input_location
;
16235 if (EXPR_HAS_LOCATION (t
))
16236 input_location
= EXPR_LOCATION (t
);
16237 if (STATEMENT_CODE_P (TREE_CODE (t
)))
16238 current_stmt_tree ()->stmts_are_full_exprs_p
= STMT_IS_FULL_EXPR_P (t
);
16240 switch (TREE_CODE (t
))
16242 case STATEMENT_LIST
:
16244 tree_stmt_iterator i
;
16245 for (i
= tsi_start (t
); !tsi_end_p (i
); tsi_next (&i
))
16246 RECUR (tsi_stmt (i
));
16250 case CTOR_INITIALIZER
:
16251 finish_mem_initializers (tsubst_initializer_list
16252 (TREE_OPERAND (t
, 0), args
));
16256 finish_return_stmt (RECUR (TREE_OPERAND (t
, 0)));
16260 tmp
= RECUR (EXPR_STMT_EXPR (t
));
16261 if (EXPR_STMT_STMT_EXPR_RESULT (t
))
16262 finish_stmt_expr_expr (tmp
, cur_stmt_expr
);
16264 finish_expr_stmt (tmp
);
16268 finish_local_using_directive (USING_STMT_NAMESPACE (t
),
16269 /*attribs=*/NULL_TREE
);
16274 tree decl
, pattern_decl
;
16277 pattern_decl
= decl
= DECL_EXPR_DECL (t
);
16278 if (TREE_CODE (decl
) == LABEL_DECL
)
16279 finish_label_decl (DECL_NAME (decl
));
16280 else if (TREE_CODE (decl
) == USING_DECL
)
16282 tree scope
= USING_DECL_SCOPE (decl
);
16283 tree name
= DECL_NAME (decl
);
16285 scope
= tsubst (scope
, args
, complain
, in_decl
);
16286 decl
= lookup_qualified_name (scope
, name
,
16287 /*is_type_p=*/false,
16288 /*complain=*/false);
16289 if (decl
== error_mark_node
|| TREE_CODE (decl
) == TREE_LIST
)
16290 qualified_name_lookup_error (scope
, name
, decl
, input_location
);
16292 finish_local_using_decl (decl
, scope
, name
);
16294 else if (is_capture_proxy (decl
)
16295 && !DECL_TEMPLATE_INSTANTIATION (current_function_decl
))
16297 /* We're in tsubst_lambda_expr, we've already inserted a new
16298 capture proxy, so look it up and register it. */
16300 if (DECL_PACK_P (decl
))
16302 inst
= (retrieve_local_specialization
16303 (DECL_CAPTURED_VARIABLE (decl
)));
16304 gcc_assert (TREE_CODE (inst
) == NONTYPE_ARGUMENT_PACK
);
16308 inst
= lookup_name_real (DECL_NAME (decl
), 0, 0,
16309 /*block_p=*/true, 0, LOOKUP_HIDDEN
);
16310 gcc_assert (inst
!= decl
&& is_capture_proxy (inst
));
16312 register_local_specialization (inst
, decl
);
16315 else if (DECL_IMPLICIT_TYPEDEF_P (decl
)
16316 && LAMBDA_TYPE_P (TREE_TYPE (decl
)))
16317 /* Don't copy the old closure; we'll create a new one in
16318 tsubst_lambda_expr. */
16322 init
= DECL_INITIAL (decl
);
16323 decl
= tsubst (decl
, args
, complain
, in_decl
);
16324 if (decl
!= error_mark_node
)
16326 /* By marking the declaration as instantiated, we avoid
16327 trying to instantiate it. Since instantiate_decl can't
16328 handle local variables, and since we've already done
16329 all that needs to be done, that's the right thing to
16332 DECL_TEMPLATE_INSTANTIATED (decl
) = 1;
16334 && ANON_AGGR_TYPE_P (TREE_TYPE (decl
)))
16335 /* Anonymous aggregates are a special case. */
16336 finish_anon_union (decl
);
16337 else if (is_capture_proxy (DECL_EXPR_DECL (t
)))
16339 DECL_CONTEXT (decl
) = current_function_decl
;
16340 if (DECL_NAME (decl
) == this_identifier
)
16342 tree lam
= DECL_CONTEXT (current_function_decl
);
16343 lam
= CLASSTYPE_LAMBDA_EXPR (lam
);
16344 LAMBDA_EXPR_THIS_CAPTURE (lam
) = decl
;
16346 insert_capture_proxy (decl
);
16348 else if (DECL_IMPLICIT_TYPEDEF_P (t
))
16349 /* We already did a pushtag. */;
16350 else if (TREE_CODE (decl
) == FUNCTION_DECL
16351 && DECL_OMP_DECLARE_REDUCTION_P (decl
)
16352 && DECL_FUNCTION_SCOPE_P (pattern_decl
))
16354 DECL_CONTEXT (decl
) = NULL_TREE
;
16356 DECL_CONTEXT (decl
) = current_function_decl
;
16357 cp_check_omp_declare_reduction (decl
);
16361 int const_init
= false;
16362 maybe_push_decl (decl
);
16364 && DECL_PRETTY_FUNCTION_P (decl
))
16366 /* For __PRETTY_FUNCTION__ we have to adjust the
16368 const char *const name
16369 = cxx_printable_name (current_function_decl
, 2);
16370 init
= cp_fname_init (name
, &TREE_TYPE (decl
));
16373 init
= tsubst_init (init
, decl
, args
, complain
, in_decl
);
16376 const_init
= (DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P
16379 && DECL_DECOMPOSITION_P (decl
)
16380 && TREE_TYPE (pattern_decl
) != error_mark_node
)
16385 = tsubst_decomp_names (decl
, pattern_decl
, args
,
16386 complain
, in_decl
, &first
, &cnt
);
16387 if (ndecl
!= error_mark_node
)
16388 cp_maybe_mangle_decomp (ndecl
, first
, cnt
);
16389 cp_finish_decl (decl
, init
, const_init
, NULL_TREE
, 0);
16390 if (ndecl
!= error_mark_node
)
16391 cp_finish_decomp (ndecl
, first
, cnt
);
16394 cp_finish_decl (decl
, init
, const_init
, NULL_TREE
, 0);
16403 stmt
= begin_for_stmt (NULL_TREE
, NULL_TREE
);
16404 RECUR (FOR_INIT_STMT (t
));
16405 finish_init_stmt (stmt
);
16406 tmp
= RECUR (FOR_COND (t
));
16407 finish_for_cond (tmp
, stmt
, false, 0);
16408 tmp
= RECUR (FOR_EXPR (t
));
16409 finish_for_expr (tmp
, stmt
);
16411 bool prev
= note_iteration_stmt_body_start ();
16412 RECUR (FOR_BODY (t
));
16413 note_iteration_stmt_body_end (prev
);
16415 finish_for_stmt (stmt
);
16418 case RANGE_FOR_STMT
:
16420 /* Construct another range_for, if this is not a final
16421 substitution (for inside inside a generic lambda of a
16422 template). Otherwise convert to a regular for. */
16424 stmt
= (processing_template_decl
16425 ? begin_range_for_stmt (NULL_TREE
, NULL_TREE
)
16426 : begin_for_stmt (NULL_TREE
, NULL_TREE
));
16427 decl
= RANGE_FOR_DECL (t
);
16428 decl
= tsubst (decl
, args
, complain
, in_decl
);
16429 maybe_push_decl (decl
);
16430 expr
= RECUR (RANGE_FOR_EXPR (t
));
16432 tree decomp_first
= NULL_TREE
;
16433 unsigned decomp_cnt
= 0;
16434 if (VAR_P (decl
) && DECL_DECOMPOSITION_P (decl
))
16435 decl
= tsubst_decomp_names (decl
, RANGE_FOR_DECL (t
), args
,
16437 &decomp_first
, &decomp_cnt
);
16439 if (processing_template_decl
)
16441 RANGE_FOR_IVDEP (stmt
) = RANGE_FOR_IVDEP (t
);
16442 RANGE_FOR_UNROLL (stmt
) = RANGE_FOR_UNROLL (t
);
16443 finish_range_for_decl (stmt
, decl
, expr
);
16447 unsigned short unroll
= (RANGE_FOR_UNROLL (t
)
16448 ? tree_to_uhwi (RANGE_FOR_UNROLL (t
)) : 0);
16449 stmt
= cp_convert_range_for (stmt
, decl
, expr
,
16450 decomp_first
, decomp_cnt
,
16451 RANGE_FOR_IVDEP (t
), unroll
);
16454 bool prev
= note_iteration_stmt_body_start ();
16455 RECUR (RANGE_FOR_BODY (t
));
16456 note_iteration_stmt_body_end (prev
);
16457 finish_for_stmt (stmt
);
16462 stmt
= begin_while_stmt ();
16463 tmp
= RECUR (WHILE_COND (t
));
16464 finish_while_stmt_cond (tmp
, stmt
, false, 0);
16466 bool prev
= note_iteration_stmt_body_start ();
16467 RECUR (WHILE_BODY (t
));
16468 note_iteration_stmt_body_end (prev
);
16470 finish_while_stmt (stmt
);
16474 stmt
= begin_do_stmt ();
16476 bool prev
= note_iteration_stmt_body_start ();
16477 RECUR (DO_BODY (t
));
16478 note_iteration_stmt_body_end (prev
);
16480 finish_do_body (stmt
);
16481 tmp
= RECUR (DO_COND (t
));
16482 finish_do_stmt (tmp
, stmt
, false, 0);
16486 stmt
= begin_if_stmt ();
16487 IF_STMT_CONSTEXPR_P (stmt
) = IF_STMT_CONSTEXPR_P (t
);
16488 tmp
= RECUR (IF_COND (t
));
16489 tmp
= finish_if_stmt_cond (tmp
, stmt
);
16490 if (IF_STMT_CONSTEXPR_P (t
) && integer_zerop (tmp
))
16491 /* Don't instantiate the THEN_CLAUSE. */;
16494 bool inhibit
= integer_zerop (fold_non_dependent_expr (tmp
));
16496 ++c_inhibit_evaluation_warnings
;
16497 RECUR (THEN_CLAUSE (t
));
16499 --c_inhibit_evaluation_warnings
;
16501 finish_then_clause (stmt
);
16503 if (IF_STMT_CONSTEXPR_P (t
) && integer_nonzerop (tmp
))
16504 /* Don't instantiate the ELSE_CLAUSE. */;
16505 else if (ELSE_CLAUSE (t
))
16507 bool inhibit
= integer_nonzerop (fold_non_dependent_expr (tmp
));
16508 begin_else_clause (stmt
);
16510 ++c_inhibit_evaluation_warnings
;
16511 RECUR (ELSE_CLAUSE (t
));
16513 --c_inhibit_evaluation_warnings
;
16514 finish_else_clause (stmt
);
16517 finish_if_stmt (stmt
);
16521 if (BIND_EXPR_BODY_BLOCK (t
))
16522 stmt
= begin_function_body ();
16524 stmt
= begin_compound_stmt (BIND_EXPR_TRY_BLOCK (t
)
16525 ? BCS_TRY_BLOCK
: 0);
16527 RECUR (BIND_EXPR_BODY (t
));
16529 if (BIND_EXPR_BODY_BLOCK (t
))
16530 finish_function_body (stmt
);
16532 finish_compound_stmt (stmt
);
16536 finish_break_stmt ();
16539 case CONTINUE_STMT
:
16540 finish_continue_stmt ();
16544 stmt
= begin_switch_stmt ();
16545 tmp
= RECUR (SWITCH_STMT_COND (t
));
16546 finish_switch_cond (tmp
, stmt
);
16547 RECUR (SWITCH_STMT_BODY (t
));
16548 finish_switch_stmt (stmt
);
16551 case CASE_LABEL_EXPR
:
16553 tree low
= RECUR (CASE_LOW (t
));
16554 tree high
= RECUR (CASE_HIGH (t
));
16555 tree l
= finish_case_label (EXPR_LOCATION (t
), low
, high
);
16556 if (l
&& TREE_CODE (l
) == CASE_LABEL_EXPR
)
16557 FALLTHROUGH_LABEL_P (CASE_LABEL (l
))
16558 = FALLTHROUGH_LABEL_P (CASE_LABEL (t
));
16564 tree decl
= LABEL_EXPR_LABEL (t
);
16567 label
= finish_label_stmt (DECL_NAME (decl
));
16568 if (TREE_CODE (label
) == LABEL_DECL
)
16569 FALLTHROUGH_LABEL_P (label
) = FALLTHROUGH_LABEL_P (decl
);
16570 if (DECL_ATTRIBUTES (decl
) != NULL_TREE
)
16571 cplus_decl_attributes (&label
, DECL_ATTRIBUTES (decl
), 0);
16576 tmp
= GOTO_DESTINATION (t
);
16577 if (TREE_CODE (tmp
) != LABEL_DECL
)
16578 /* Computed goto's must be tsubst'd into. On the other hand,
16579 non-computed gotos must not be; the identifier in question
16580 will have no binding. */
16583 tmp
= DECL_NAME (tmp
);
16584 finish_goto_stmt (tmp
);
16589 tree string
= RECUR (ASM_STRING (t
));
16590 tree outputs
= tsubst_copy_asm_operands (ASM_OUTPUTS (t
), args
,
16591 complain
, in_decl
);
16592 tree inputs
= tsubst_copy_asm_operands (ASM_INPUTS (t
), args
,
16593 complain
, in_decl
);
16594 tree clobbers
= tsubst_copy_asm_operands (ASM_CLOBBERS (t
), args
,
16595 complain
, in_decl
);
16596 tree labels
= tsubst_copy_asm_operands (ASM_LABELS (t
), args
,
16597 complain
, in_decl
);
16598 tmp
= finish_asm_stmt (ASM_VOLATILE_P (t
), string
, outputs
, inputs
,
16600 tree asm_expr
= tmp
;
16601 if (TREE_CODE (asm_expr
) == CLEANUP_POINT_EXPR
)
16602 asm_expr
= TREE_OPERAND (asm_expr
, 0);
16603 ASM_INPUT_P (asm_expr
) = ASM_INPUT_P (t
);
16610 stmt
= begin_try_block ();
16611 RECUR (TRY_STMTS (t
));
16612 finish_cleanup_try_block (stmt
);
16613 finish_cleanup (RECUR (TRY_HANDLERS (t
)), stmt
);
16617 tree compound_stmt
= NULL_TREE
;
16619 if (FN_TRY_BLOCK_P (t
))
16620 stmt
= begin_function_try_block (&compound_stmt
);
16622 stmt
= begin_try_block ();
16624 RECUR (TRY_STMTS (t
));
16626 if (FN_TRY_BLOCK_P (t
))
16627 finish_function_try_block (stmt
);
16629 finish_try_block (stmt
);
16631 RECUR (TRY_HANDLERS (t
));
16632 if (FN_TRY_BLOCK_P (t
))
16633 finish_function_handler_sequence (stmt
, compound_stmt
);
16635 finish_handler_sequence (stmt
);
16641 tree decl
= HANDLER_PARMS (t
);
16645 decl
= tsubst (decl
, args
, complain
, in_decl
);
16646 /* Prevent instantiate_decl from trying to instantiate
16647 this variable. We've already done all that needs to be
16649 if (decl
!= error_mark_node
)
16650 DECL_TEMPLATE_INSTANTIATED (decl
) = 1;
16652 stmt
= begin_handler ();
16653 finish_handler_parms (decl
, stmt
);
16654 RECUR (HANDLER_BODY (t
));
16655 finish_handler (stmt
);
16660 tmp
= tsubst (TREE_TYPE (t
), args
, complain
, NULL_TREE
);
16661 if (CLASS_TYPE_P (tmp
))
16663 /* Local classes are not independent templates; they are
16664 instantiated along with their containing function. And this
16665 way we don't have to deal with pushing out of one local class
16666 to instantiate a member of another local class. */
16667 /* Closures are handled by the LAMBDA_EXPR. */
16668 gcc_assert (!LAMBDA_TYPE_P (TREE_TYPE (t
)));
16669 complete_type (tmp
);
16670 for (tree fld
= TYPE_FIELDS (tmp
); fld
; fld
= DECL_CHAIN (fld
))
16672 || (TREE_CODE (fld
) == FUNCTION_DECL
16673 && !DECL_ARTIFICIAL (fld
)))
16674 && DECL_TEMPLATE_INSTANTIATION (fld
))
16675 instantiate_decl (fld
, /*defer_ok=*/false,
16676 /*expl_inst_class=*/false);
16680 case STATIC_ASSERT
:
16684 ++c_inhibit_evaluation_warnings
;
16686 tsubst_expr (STATIC_ASSERT_CONDITION (t
),
16689 /*integral_constant_expression_p=*/true);
16690 --c_inhibit_evaluation_warnings
;
16692 finish_static_assert (condition
,
16693 STATIC_ASSERT_MESSAGE (t
),
16694 STATIC_ASSERT_SOURCE_LOCATION (t
),
16695 /*member_p=*/false);
16700 case OACC_PARALLEL
:
16701 tmp
= tsubst_omp_clauses (OMP_CLAUSES (t
), C_ORT_ACC
, args
, complain
,
16703 stmt
= begin_omp_parallel ();
16704 RECUR (OMP_BODY (t
));
16705 finish_omp_construct (TREE_CODE (t
), stmt
, tmp
);
16709 r
= push_omp_privatization_clauses (OMP_PARALLEL_COMBINED (t
));
16710 tmp
= tsubst_omp_clauses (OMP_PARALLEL_CLAUSES (t
), C_ORT_OMP
, args
,
16711 complain
, in_decl
);
16712 if (OMP_PARALLEL_COMBINED (t
))
16713 omp_parallel_combined_clauses
= &tmp
;
16714 stmt
= begin_omp_parallel ();
16715 RECUR (OMP_PARALLEL_BODY (t
));
16716 gcc_assert (omp_parallel_combined_clauses
== NULL
);
16717 OMP_PARALLEL_COMBINED (finish_omp_parallel (tmp
, stmt
))
16718 = OMP_PARALLEL_COMBINED (t
);
16719 pop_omp_privatization_clauses (r
);
16723 r
= push_omp_privatization_clauses (false);
16724 tmp
= tsubst_omp_clauses (OMP_TASK_CLAUSES (t
), C_ORT_OMP
, args
,
16725 complain
, in_decl
);
16726 stmt
= begin_omp_task ();
16727 RECUR (OMP_TASK_BODY (t
));
16728 finish_omp_task (tmp
, stmt
);
16729 pop_omp_privatization_clauses (r
);
16734 case OMP_DISTRIBUTE
:
16738 tree clauses
, body
, pre_body
;
16739 tree declv
= NULL_TREE
, initv
= NULL_TREE
, condv
= NULL_TREE
;
16740 tree orig_declv
= NULL_TREE
;
16741 tree incrv
= NULL_TREE
;
16742 enum c_omp_region_type ort
= C_ORT_OMP
;
16745 if (TREE_CODE (t
) == OACC_LOOP
)
16748 r
= push_omp_privatization_clauses (OMP_FOR_INIT (t
) == NULL_TREE
);
16749 clauses
= tsubst_omp_clauses (OMP_FOR_CLAUSES (t
), ort
, args
, complain
,
16751 if (OMP_FOR_INIT (t
) != NULL_TREE
)
16753 declv
= make_tree_vec (TREE_VEC_LENGTH (OMP_FOR_INIT (t
)));
16754 if (OMP_FOR_ORIG_DECLS (t
))
16755 orig_declv
= make_tree_vec (TREE_VEC_LENGTH (OMP_FOR_INIT (t
)));
16756 initv
= make_tree_vec (TREE_VEC_LENGTH (OMP_FOR_INIT (t
)));
16757 condv
= make_tree_vec (TREE_VEC_LENGTH (OMP_FOR_INIT (t
)));
16758 incrv
= make_tree_vec (TREE_VEC_LENGTH (OMP_FOR_INIT (t
)));
16761 stmt
= begin_omp_structured_block ();
16763 pre_body
= push_stmt_list ();
16764 RECUR (OMP_FOR_PRE_BODY (t
));
16765 pre_body
= pop_stmt_list (pre_body
);
16767 if (OMP_FOR_INIT (t
) != NULL_TREE
)
16768 for (i
= 0; i
< TREE_VEC_LENGTH (OMP_FOR_INIT (t
)); i
++)
16769 tsubst_omp_for_iterator (t
, i
, declv
, orig_declv
, initv
, condv
,
16770 incrv
, &clauses
, args
, complain
, in_decl
,
16771 integral_constant_expression_p
);
16772 omp_parallel_combined_clauses
= NULL
;
16774 body
= push_stmt_list ();
16775 RECUR (OMP_FOR_BODY (t
));
16776 body
= pop_stmt_list (body
);
16778 if (OMP_FOR_INIT (t
) != NULL_TREE
)
16779 t
= finish_omp_for (EXPR_LOCATION (t
), TREE_CODE (t
), declv
,
16780 orig_declv
, initv
, condv
, incrv
, body
, pre_body
,
16784 t
= make_node (TREE_CODE (t
));
16785 TREE_TYPE (t
) = void_type_node
;
16786 OMP_FOR_BODY (t
) = body
;
16787 OMP_FOR_PRE_BODY (t
) = pre_body
;
16788 OMP_FOR_CLAUSES (t
) = clauses
;
16789 SET_EXPR_LOCATION (t
, EXPR_LOCATION (t
));
16793 add_stmt (finish_omp_structured_block (stmt
));
16794 pop_omp_privatization_clauses (r
);
16799 omp_parallel_combined_clauses
= NULL
;
16804 r
= push_omp_privatization_clauses (TREE_CODE (t
) == OMP_TEAMS
16805 && OMP_TEAMS_COMBINED (t
));
16806 tmp
= tsubst_omp_clauses (OMP_CLAUSES (t
), C_ORT_OMP
, args
, complain
,
16808 stmt
= push_stmt_list ();
16809 RECUR (OMP_BODY (t
));
16810 stmt
= pop_stmt_list (stmt
);
16813 OMP_BODY (t
) = stmt
;
16814 OMP_CLAUSES (t
) = tmp
;
16816 pop_omp_privatization_clauses (r
);
16820 case OMP_TARGET_DATA
:
16822 tmp
= tsubst_omp_clauses (OMP_CLAUSES (t
), (TREE_CODE (t
) == OACC_DATA
)
16823 ? C_ORT_ACC
: C_ORT_OMP
, args
, complain
,
16825 keep_next_level (true);
16826 stmt
= begin_omp_structured_block ();
16828 RECUR (OMP_BODY (t
));
16829 stmt
= finish_omp_structured_block (stmt
);
16832 OMP_BODY (t
) = stmt
;
16833 OMP_CLAUSES (t
) = tmp
;
16834 if (TREE_CODE (t
) == OMP_TARGET
&& OMP_TARGET_COMBINED (t
))
16836 tree teams
= cp_walk_tree (&stmt
, tsubst_find_omp_teams
, NULL
, NULL
);
16839 /* For combined target teams, ensure the num_teams and
16840 thread_limit clause expressions are evaluated on the host,
16841 before entering the target construct. */
16843 for (c
= OMP_TEAMS_CLAUSES (teams
);
16844 c
; c
= OMP_CLAUSE_CHAIN (c
))
16845 if ((OMP_CLAUSE_CODE (c
) == OMP_CLAUSE_NUM_TEAMS
16846 || OMP_CLAUSE_CODE (c
) == OMP_CLAUSE_THREAD_LIMIT
)
16847 && TREE_CODE (OMP_CLAUSE_OPERAND (c
, 0)) != INTEGER_CST
)
16849 tree expr
= OMP_CLAUSE_OPERAND (c
, 0);
16850 expr
= force_target_expr (TREE_TYPE (expr
), expr
, tf_none
);
16851 if (expr
== error_mark_node
)
16853 tmp
= TARGET_EXPR_SLOT (expr
);
16855 OMP_CLAUSE_OPERAND (c
, 0) = expr
;
16856 tree tc
= build_omp_clause (OMP_CLAUSE_LOCATION (c
),
16857 OMP_CLAUSE_FIRSTPRIVATE
);
16858 OMP_CLAUSE_DECL (tc
) = tmp
;
16859 OMP_CLAUSE_CHAIN (tc
) = OMP_TARGET_CLAUSES (t
);
16860 OMP_TARGET_CLAUSES (t
) = tc
;
16869 tmp
= tsubst_omp_clauses (OACC_DECLARE_CLAUSES (t
), C_ORT_ACC
, args
,
16870 complain
, in_decl
);
16871 OACC_DECLARE_CLAUSES (t
) = tmp
;
16875 case OMP_TARGET_UPDATE
:
16876 case OMP_TARGET_ENTER_DATA
:
16877 case OMP_TARGET_EXIT_DATA
:
16878 tmp
= tsubst_omp_clauses (OMP_STANDALONE_CLAUSES (t
), C_ORT_OMP
, args
,
16879 complain
, in_decl
);
16881 OMP_STANDALONE_CLAUSES (t
) = tmp
;
16885 case OACC_ENTER_DATA
:
16886 case OACC_EXIT_DATA
:
16888 tmp
= tsubst_omp_clauses (OMP_STANDALONE_CLAUSES (t
), C_ORT_ACC
, args
,
16889 complain
, in_decl
);
16891 OMP_STANDALONE_CLAUSES (t
) = tmp
;
16896 tmp
= tsubst_omp_clauses (OMP_ORDERED_CLAUSES (t
), C_ORT_OMP
, args
,
16897 complain
, in_decl
);
16898 stmt
= push_stmt_list ();
16899 RECUR (OMP_BODY (t
));
16900 stmt
= pop_stmt_list (stmt
);
16903 OMP_BODY (t
) = stmt
;
16904 OMP_ORDERED_CLAUSES (t
) = tmp
;
16910 case OMP_TASKGROUP
:
16911 stmt
= push_stmt_list ();
16912 RECUR (OMP_BODY (t
));
16913 stmt
= pop_stmt_list (stmt
);
16916 OMP_BODY (t
) = stmt
;
16921 gcc_assert (OMP_ATOMIC_DEPENDENT_P (t
));
16922 if (TREE_CODE (TREE_OPERAND (t
, 1)) != MODIFY_EXPR
)
16924 tree op1
= TREE_OPERAND (t
, 1);
16925 tree rhs1
= NULL_TREE
;
16927 if (TREE_CODE (op1
) == COMPOUND_EXPR
)
16929 rhs1
= RECUR (TREE_OPERAND (op1
, 0));
16930 op1
= TREE_OPERAND (op1
, 1);
16932 lhs
= RECUR (TREE_OPERAND (op1
, 0));
16933 rhs
= RECUR (TREE_OPERAND (op1
, 1));
16934 finish_omp_atomic (OMP_ATOMIC
, TREE_CODE (op1
), lhs
, rhs
,
16935 NULL_TREE
, NULL_TREE
, rhs1
,
16936 OMP_ATOMIC_SEQ_CST (t
));
16940 tree op1
= TREE_OPERAND (t
, 1);
16941 tree v
= NULL_TREE
, lhs
, rhs
= NULL_TREE
, lhs1
= NULL_TREE
;
16942 tree rhs1
= NULL_TREE
;
16943 enum tree_code code
= TREE_CODE (TREE_OPERAND (op1
, 1));
16944 enum tree_code opcode
= NOP_EXPR
;
16945 if (code
== OMP_ATOMIC_READ
)
16947 v
= RECUR (TREE_OPERAND (op1
, 0));
16948 lhs
= RECUR (TREE_OPERAND (TREE_OPERAND (op1
, 1), 0));
16950 else if (code
== OMP_ATOMIC_CAPTURE_OLD
16951 || code
== OMP_ATOMIC_CAPTURE_NEW
)
16953 tree op11
= TREE_OPERAND (TREE_OPERAND (op1
, 1), 1);
16954 v
= RECUR (TREE_OPERAND (op1
, 0));
16955 lhs1
= RECUR (TREE_OPERAND (TREE_OPERAND (op1
, 1), 0));
16956 if (TREE_CODE (op11
) == COMPOUND_EXPR
)
16958 rhs1
= RECUR (TREE_OPERAND (op11
, 0));
16959 op11
= TREE_OPERAND (op11
, 1);
16961 lhs
= RECUR (TREE_OPERAND (op11
, 0));
16962 rhs
= RECUR (TREE_OPERAND (op11
, 1));
16963 opcode
= TREE_CODE (op11
);
16964 if (opcode
== MODIFY_EXPR
)
16970 lhs
= RECUR (TREE_OPERAND (op1
, 0));
16971 rhs
= RECUR (TREE_OPERAND (op1
, 1));
16973 finish_omp_atomic (code
, opcode
, lhs
, rhs
, v
, lhs1
, rhs1
,
16974 OMP_ATOMIC_SEQ_CST (t
));
16978 case TRANSACTION_EXPR
:
16981 flags
|= (TRANSACTION_EXPR_OUTER (t
) ? TM_STMT_ATTR_OUTER
: 0);
16982 flags
|= (TRANSACTION_EXPR_RELAXED (t
) ? TM_STMT_ATTR_RELAXED
: 0);
16984 if (TRANSACTION_EXPR_IS_STMT (t
))
16986 tree body
= TRANSACTION_EXPR_BODY (t
);
16987 tree noex
= NULL_TREE
;
16988 if (TREE_CODE (body
) == MUST_NOT_THROW_EXPR
)
16990 noex
= MUST_NOT_THROW_COND (body
);
16991 if (noex
== NULL_TREE
)
16992 noex
= boolean_true_node
;
16993 body
= TREE_OPERAND (body
, 0);
16995 stmt
= begin_transaction_stmt (input_location
, NULL
, flags
);
16997 finish_transaction_stmt (stmt
, NULL
, flags
, RECUR (noex
));
17001 stmt
= build_transaction_expr (EXPR_LOCATION (t
),
17002 RECUR (TRANSACTION_EXPR_BODY (t
)),
17009 case MUST_NOT_THROW_EXPR
:
17011 tree op0
= RECUR (TREE_OPERAND (t
, 0));
17012 tree cond
= RECUR (MUST_NOT_THROW_COND (t
));
17013 RETURN (build_must_not_throw_expr (op0
, cond
));
17016 case EXPR_PACK_EXPANSION
:
17017 error ("invalid use of pack expansion expression");
17018 RETURN (error_mark_node
);
17020 case NONTYPE_ARGUMENT_PACK
:
17021 error ("use %<...%> to expand argument pack");
17022 RETURN (error_mark_node
);
17024 case COMPOUND_EXPR
:
17025 tmp
= RECUR (TREE_OPERAND (t
, 0));
17026 if (tmp
== NULL_TREE
)
17027 /* If the first operand was a statement, we're done with it. */
17028 RETURN (RECUR (TREE_OPERAND (t
, 1)));
17029 RETURN (build_x_compound_expr (EXPR_LOCATION (t
), tmp
,
17030 RECUR (TREE_OPERAND (t
, 1)),
17033 case ANNOTATE_EXPR
:
17034 tmp
= RECUR (TREE_OPERAND (t
, 0));
17035 RETURN (build3_loc (EXPR_LOCATION (t
), ANNOTATE_EXPR
,
17036 TREE_TYPE (tmp
), tmp
,
17037 RECUR (TREE_OPERAND (t
, 1)),
17038 RECUR (TREE_OPERAND (t
, 2))));
17041 gcc_assert (!STATEMENT_CODE_P (TREE_CODE (t
)));
17043 RETURN (tsubst_copy_and_build (t
, args
, complain
, in_decl
,
17044 /*function_p=*/false,
17045 integral_constant_expression_p
));
17048 RETURN (NULL_TREE
);
17050 input_location
= loc
;
17056 /* Instantiate the special body of the artificial DECL_OMP_DECLARE_REDUCTION
17057 function. For description of the body see comment above
17058 cp_parser_omp_declare_reduction_exprs. */
17061 tsubst_omp_udr (tree t
, tree args
, tsubst_flags_t complain
, tree in_decl
)
17063 if (t
== NULL_TREE
|| t
== error_mark_node
)
17066 gcc_assert (TREE_CODE (t
) == STATEMENT_LIST
);
17068 tree_stmt_iterator tsi
;
17071 memset (stmts
, 0, sizeof stmts
);
17072 for (i
= 0, tsi
= tsi_start (t
);
17073 i
< 7 && !tsi_end_p (tsi
);
17074 i
++, tsi_next (&tsi
))
17075 stmts
[i
] = tsi_stmt (tsi
);
17076 gcc_assert (tsi_end_p (tsi
));
17080 gcc_assert (TREE_CODE (stmts
[0]) == DECL_EXPR
17081 && TREE_CODE (stmts
[1]) == DECL_EXPR
);
17082 tree omp_out
= tsubst (DECL_EXPR_DECL (stmts
[0]),
17083 args
, complain
, in_decl
);
17084 tree omp_in
= tsubst (DECL_EXPR_DECL (stmts
[1]),
17085 args
, complain
, in_decl
);
17086 DECL_CONTEXT (omp_out
) = current_function_decl
;
17087 DECL_CONTEXT (omp_in
) = current_function_decl
;
17088 keep_next_level (true);
17089 tree block
= begin_omp_structured_block ();
17090 tsubst_expr (stmts
[2], args
, complain
, in_decl
, false);
17091 block
= finish_omp_structured_block (block
);
17092 block
= maybe_cleanup_point_expr_void (block
);
17093 add_decl_expr (omp_out
);
17094 if (TREE_NO_WARNING (DECL_EXPR_DECL (stmts
[0])))
17095 TREE_NO_WARNING (omp_out
) = 1;
17096 add_decl_expr (omp_in
);
17097 finish_expr_stmt (block
);
17101 gcc_assert (TREE_CODE (stmts
[3]) == DECL_EXPR
17102 && TREE_CODE (stmts
[4]) == DECL_EXPR
);
17103 tree omp_priv
= tsubst (DECL_EXPR_DECL (stmts
[3]),
17104 args
, complain
, in_decl
);
17105 tree omp_orig
= tsubst (DECL_EXPR_DECL (stmts
[4]),
17106 args
, complain
, in_decl
);
17107 DECL_CONTEXT (omp_priv
) = current_function_decl
;
17108 DECL_CONTEXT (omp_orig
) = current_function_decl
;
17109 keep_next_level (true);
17110 tree block
= begin_omp_structured_block ();
17111 tsubst_expr (stmts
[5], args
, complain
, in_decl
, false);
17112 block
= finish_omp_structured_block (block
);
17113 block
= maybe_cleanup_point_expr_void (block
);
17114 cp_walk_tree (&block
, cp_remove_omp_priv_cleanup_stmt
, omp_priv
, NULL
);
17115 add_decl_expr (omp_priv
);
17116 add_decl_expr (omp_orig
);
17117 finish_expr_stmt (block
);
17119 add_decl_expr (omp_orig
);
17123 /* T is a postfix-expression that is not being used in a function
17124 call. Return the substituted version of T. */
17127 tsubst_non_call_postfix_expression (tree t
, tree args
,
17128 tsubst_flags_t complain
,
17131 if (TREE_CODE (t
) == SCOPE_REF
)
17132 t
= tsubst_qualified_id (t
, args
, complain
, in_decl
,
17133 /*done=*/false, /*address_p=*/false);
17135 t
= tsubst_copy_and_build (t
, args
, complain
, in_decl
,
17136 /*function_p=*/false,
17137 /*integral_constant_expression_p=*/false);
17142 /* T is a LAMBDA_EXPR. Generate a new LAMBDA_EXPR for the current
17143 instantiation context. Instantiating a pack expansion containing a lambda
17144 might result in multiple lambdas all based on the same lambda in the
17148 tsubst_lambda_expr (tree t
, tree args
, tsubst_flags_t complain
, tree in_decl
)
17150 tree oldfn
= lambda_function (t
);
17153 tree r
= build_lambda_expr ();
17155 LAMBDA_EXPR_LOCATION (r
)
17156 = LAMBDA_EXPR_LOCATION (t
);
17157 LAMBDA_EXPR_DEFAULT_CAPTURE_MODE (r
)
17158 = LAMBDA_EXPR_DEFAULT_CAPTURE_MODE (t
);
17159 LAMBDA_EXPR_MUTABLE_P (r
) = LAMBDA_EXPR_MUTABLE_P (t
);
17161 if (LAMBDA_EXPR_EXTRA_SCOPE (t
) == NULL_TREE
)
17162 LAMBDA_EXPR_EXTRA_SCOPE (r
) = NULL_TREE
;
17164 record_lambda_scope (r
);
17166 gcc_assert (LAMBDA_EXPR_THIS_CAPTURE (t
) == NULL_TREE
17167 && LAMBDA_EXPR_PENDING_PROXIES (t
) == NULL
);
17169 for (tree cap
= LAMBDA_EXPR_CAPTURE_LIST (t
); cap
;
17170 cap
= TREE_CHAIN (cap
))
17172 tree field
= TREE_PURPOSE (cap
);
17173 if (PACK_EXPANSION_P (field
))
17174 field
= PACK_EXPANSION_PATTERN (field
);
17175 field
= tsubst_decl (field
, args
, complain
);
17177 if (field
== error_mark_node
)
17178 return error_mark_node
;
17180 tree init
= TREE_VALUE (cap
);
17181 if (PACK_EXPANSION_P (init
))
17182 init
= tsubst_pack_expansion (init
, args
, complain
, in_decl
);
17184 init
= tsubst_copy_and_build (init
, args
, complain
, in_decl
,
17185 /*fn*/false, /*constexpr*/false);
17187 if (TREE_CODE (field
) == TREE_VEC
)
17189 int len
= TREE_VEC_LENGTH (field
);
17190 gcc_assert (TREE_CODE (init
) == TREE_VEC
17191 && TREE_VEC_LENGTH (init
) == len
);
17192 for (int i
= 0; i
< len
; ++i
)
17193 LAMBDA_EXPR_CAPTURE_LIST (r
)
17194 = tree_cons (TREE_VEC_ELT (field
, i
),
17195 TREE_VEC_ELT (init
, i
),
17196 LAMBDA_EXPR_CAPTURE_LIST (r
));
17200 LAMBDA_EXPR_CAPTURE_LIST (r
)
17201 = tree_cons (field
, init
, LAMBDA_EXPR_CAPTURE_LIST (r
));
17203 if (id_equal (DECL_NAME (field
), "__this"))
17204 LAMBDA_EXPR_THIS_CAPTURE (r
) = field
;
17208 tree type
= begin_lambda_type (r
);
17210 /* Do this again now that LAMBDA_EXPR_EXTRA_SCOPE is set. */
17211 determine_visibility (TYPE_NAME (type
));
17213 register_capture_members (LAMBDA_EXPR_CAPTURE_LIST (r
));
17215 tree oldtmpl
= (generic_lambda_fn_p (oldfn
)
17216 ? DECL_TI_TEMPLATE (oldfn
)
17219 tree fntype
= static_fn_type (oldfn
);
17221 ++processing_template_decl
;
17222 fntype
= tsubst (fntype
, args
, complain
, in_decl
);
17224 --processing_template_decl
;
17226 if (fntype
== error_mark_node
)
17227 r
= error_mark_node
;
17230 /* Fix the type of 'this'. */
17231 fntype
= build_memfn_type (fntype
, type
,
17232 type_memfn_quals (fntype
),
17233 type_memfn_rqual (fntype
));
17237 tmpl
= tsubst_template_decl (oldtmpl
, args
, complain
, fntype
);
17238 fn
= DECL_TEMPLATE_RESULT (tmpl
);
17239 finish_member_declaration (tmpl
);
17244 fn
= tsubst_function_decl (oldfn
, args
, complain
, fntype
);
17245 finish_member_declaration (fn
);
17248 /* Let finish_function set this. */
17249 DECL_DECLARED_CONSTEXPR_P (fn
) = false;
17251 bool nested
= cfun
;
17253 push_function_context ();
17255 /* Still increment function_depth so that we don't GC in the
17256 middle of an expression. */
17259 local_specialization_stack
s (lss_copy
);
17261 tree body
= start_lambda_function (fn
, r
);
17263 register_parameter_specializations (oldfn
, fn
);
17265 tsubst_expr (DECL_SAVED_TREE (oldfn
), args
, complain
, r
,
17266 /*constexpr*/false);
17268 finish_lambda_function (body
);
17271 pop_function_context ();
17275 /* The capture list was built up in reverse order; fix that now. */
17276 LAMBDA_EXPR_CAPTURE_LIST (r
)
17277 = nreverse (LAMBDA_EXPR_CAPTURE_LIST (r
));
17279 LAMBDA_EXPR_THIS_CAPTURE (r
) = NULL_TREE
;
17281 maybe_add_lambda_conv_op (type
);
17284 finish_struct (type
, /*attr*/NULL_TREE
);
17286 insert_pending_capture_proxies ();
17291 /* Like tsubst but deals with expressions and performs semantic
17292 analysis. FUNCTION_P is true if T is the "F" in "F (ARGS)". */
17295 tsubst_copy_and_build (tree t
,
17297 tsubst_flags_t complain
,
17300 bool integral_constant_expression_p
)
17302 #define RETURN(EXP) do { retval = (EXP); goto out; } while(0)
17303 #define RECUR(NODE) \
17304 tsubst_copy_and_build (NODE, args, complain, in_decl, \
17305 /*function_p=*/false, \
17306 integral_constant_expression_p)
17311 if (t
== NULL_TREE
|| t
== error_mark_node
)
17314 loc
= input_location
;
17315 if (EXPR_HAS_LOCATION (t
))
17316 input_location
= EXPR_LOCATION (t
);
17318 /* N3276 decltype magic only applies to calls at the top level or on the
17319 right side of a comma. */
17320 tsubst_flags_t decltype_flag
= (complain
& tf_decltype
);
17321 complain
&= ~tf_decltype
;
17323 switch (TREE_CODE (t
))
17327 /* Fall through. */
17328 case IDENTIFIER_NODE
:
17332 bool non_integral_constant_expression_p
;
17333 const char *error_msg
;
17335 if (IDENTIFIER_CONV_OP_P (t
))
17337 tree new_type
= tsubst (TREE_TYPE (t
), args
, complain
, in_decl
);
17338 t
= make_conv_op_name (new_type
);
17341 /* Look up the name. */
17342 decl
= lookup_name (t
);
17344 /* By convention, expressions use ERROR_MARK_NODE to indicate
17345 failure, not NULL_TREE. */
17346 if (decl
== NULL_TREE
)
17347 decl
= error_mark_node
;
17349 decl
= finish_id_expression (t
, decl
, NULL_TREE
,
17351 integral_constant_expression_p
,
17352 /*allow_non_integral_constant_expression_p=*/(cxx_dialect
>= cxx11
),
17353 &non_integral_constant_expression_p
,
17354 /*template_p=*/false,
17356 /*address_p=*/false,
17357 /*template_arg_p=*/false,
17362 if (!function_p
&& identifier_p (decl
))
17364 if (complain
& tf_error
)
17365 unqualified_name_lookup_error (decl
);
17366 decl
= error_mark_node
;
17371 case TEMPLATE_ID_EXPR
:
17374 tree templ
= RECUR (TREE_OPERAND (t
, 0));
17375 tree targs
= TREE_OPERAND (t
, 1);
17378 targs
= tsubst_template_args (targs
, args
, complain
, in_decl
);
17379 if (targs
== error_mark_node
)
17380 RETURN (error_mark_node
);
17382 if (TREE_CODE (templ
) == SCOPE_REF
)
17384 tree name
= TREE_OPERAND (templ
, 1);
17385 tree tid
= lookup_template_function (name
, targs
);
17386 TREE_OPERAND (templ
, 1) = tid
;
17390 if (variable_template_p (templ
))
17391 RETURN (lookup_and_finish_template_variable (templ
, targs
, complain
));
17393 if (TREE_CODE (templ
) == COMPONENT_REF
)
17395 object
= TREE_OPERAND (templ
, 0);
17396 templ
= TREE_OPERAND (templ
, 1);
17399 object
= NULL_TREE
;
17400 templ
= lookup_template_function (templ
, targs
);
17403 RETURN (build3 (COMPONENT_REF
, TREE_TYPE (templ
),
17404 object
, templ
, NULL_TREE
));
17406 RETURN (baselink_for_fns (templ
));
17411 tree r
= RECUR (TREE_OPERAND (t
, 0));
17413 if (REFERENCE_REF_P (t
))
17415 /* A type conversion to reference type will be enclosed in
17416 such an indirect ref, but the substitution of the cast
17417 will have also added such an indirect ref. */
17418 r
= convert_from_reference (r
);
17421 r
= build_x_indirect_ref (input_location
, r
, RO_UNARY_STAR
,
17422 complain
|decltype_flag
);
17424 if (REF_PARENTHESIZED_P (t
))
17425 r
= force_paren_expr (r
);
17432 tree type
= tsubst (TREE_TYPE (t
), args
, complain
, in_decl
);
17433 tree op0
= RECUR (TREE_OPERAND (t
, 0));
17434 RETURN (build_nop (type
, op0
));
17437 case IMPLICIT_CONV_EXPR
:
17439 tree type
= tsubst (TREE_TYPE (t
), args
, complain
, in_decl
);
17440 tree expr
= RECUR (TREE_OPERAND (t
, 0));
17441 if (dependent_type_p (type
) || type_dependent_expression_p (expr
))
17443 retval
= copy_node (t
);
17444 TREE_TYPE (retval
) = type
;
17445 TREE_OPERAND (retval
, 0) = expr
;
17448 if (IMPLICIT_CONV_EXPR_NONTYPE_ARG (t
))
17449 /* We'll pass this to convert_nontype_argument again, we don't need
17450 to actually perform any conversion here. */
17452 int flags
= LOOKUP_IMPLICIT
;
17453 if (IMPLICIT_CONV_EXPR_DIRECT_INIT (t
))
17454 flags
= LOOKUP_NORMAL
;
17455 RETURN (perform_implicit_conversion_flags (type
, expr
, complain
,
17461 tree type
= tsubst (TREE_TYPE (t
), args
, complain
, in_decl
);
17462 tree op0
= RECUR (TREE_OPERAND (t
, 0));
17463 if (op0
== error_mark_node
)
17464 RETURN (error_mark_node
);
17465 RETURN (build1 (CONVERT_EXPR
, type
, op0
));
17469 case REINTERPRET_CAST_EXPR
:
17470 case CONST_CAST_EXPR
:
17471 case DYNAMIC_CAST_EXPR
:
17472 case STATIC_CAST_EXPR
:
17475 tree op
, r
= NULL_TREE
;
17477 type
= tsubst (TREE_TYPE (t
), args
, complain
, in_decl
);
17478 if (integral_constant_expression_p
17479 && !cast_valid_in_integral_constant_expression_p (type
))
17481 if (complain
& tf_error
)
17482 error ("a cast to a type other than an integral or "
17483 "enumeration type cannot appear in a constant-expression");
17484 RETURN (error_mark_node
);
17487 op
= RECUR (TREE_OPERAND (t
, 0));
17489 warning_sentinel
s(warn_useless_cast
);
17490 warning_sentinel
s2(warn_ignored_qualifiers
);
17491 switch (TREE_CODE (t
))
17494 r
= build_functional_cast (type
, op
, complain
);
17496 case REINTERPRET_CAST_EXPR
:
17497 r
= build_reinterpret_cast (type
, op
, complain
);
17499 case CONST_CAST_EXPR
:
17500 r
= build_const_cast (type
, op
, complain
);
17502 case DYNAMIC_CAST_EXPR
:
17503 r
= build_dynamic_cast (type
, op
, complain
);
17505 case STATIC_CAST_EXPR
:
17506 r
= build_static_cast (type
, op
, complain
);
17509 gcc_unreachable ();
17515 case POSTDECREMENT_EXPR
:
17516 case POSTINCREMENT_EXPR
:
17517 op1
= tsubst_non_call_postfix_expression (TREE_OPERAND (t
, 0),
17518 args
, complain
, in_decl
);
17519 RETURN (build_x_unary_op (input_location
, TREE_CODE (t
), op1
,
17520 complain
|decltype_flag
));
17522 case PREDECREMENT_EXPR
:
17523 case PREINCREMENT_EXPR
:
17527 case TRUTH_NOT_EXPR
:
17528 case UNARY_PLUS_EXPR
: /* Unary + */
17529 case REALPART_EXPR
:
17530 case IMAGPART_EXPR
:
17531 RETURN (build_x_unary_op (input_location
, TREE_CODE (t
),
17532 RECUR (TREE_OPERAND (t
, 0)),
17533 complain
|decltype_flag
));
17535 case FIX_TRUNC_EXPR
:
17536 gcc_unreachable ();
17539 op1
= TREE_OPERAND (t
, 0);
17540 if (TREE_CODE (op1
) == LABEL_DECL
)
17541 RETURN (finish_label_address_expr (DECL_NAME (op1
),
17542 EXPR_LOCATION (op1
)));
17543 if (TREE_CODE (op1
) == SCOPE_REF
)
17544 op1
= tsubst_qualified_id (op1
, args
, complain
, in_decl
,
17545 /*done=*/true, /*address_p=*/true);
17547 op1
= tsubst_non_call_postfix_expression (op1
, args
, complain
,
17549 RETURN (build_x_unary_op (input_location
, ADDR_EXPR
, op1
,
17550 complain
|decltype_flag
));
17555 case TRUNC_DIV_EXPR
:
17556 case CEIL_DIV_EXPR
:
17557 case FLOOR_DIV_EXPR
:
17558 case ROUND_DIV_EXPR
:
17559 case EXACT_DIV_EXPR
:
17563 case TRUNC_MOD_EXPR
:
17564 case FLOOR_MOD_EXPR
:
17565 case TRUTH_ANDIF_EXPR
:
17566 case TRUTH_ORIF_EXPR
:
17567 case TRUTH_AND_EXPR
:
17568 case TRUTH_OR_EXPR
:
17584 warning_sentinel
s1(warn_type_limits
);
17585 warning_sentinel
s2(warn_div_by_zero
);
17586 warning_sentinel
s3(warn_logical_op
);
17587 warning_sentinel
s4(warn_tautological_compare
);
17588 tree op0
= RECUR (TREE_OPERAND (t
, 0));
17589 tree op1
= RECUR (TREE_OPERAND (t
, 1));
17590 tree r
= build_x_binary_op
17591 (input_location
, TREE_CODE (t
),
17593 (TREE_NO_WARNING (TREE_OPERAND (t
, 0))
17595 : TREE_CODE (TREE_OPERAND (t
, 0))),
17597 (TREE_NO_WARNING (TREE_OPERAND (t
, 1))
17599 : TREE_CODE (TREE_OPERAND (t
, 1))),
17601 complain
|decltype_flag
);
17602 if (EXPR_P (r
) && TREE_NO_WARNING (t
))
17603 TREE_NO_WARNING (r
) = TREE_NO_WARNING (t
);
17608 case POINTER_PLUS_EXPR
:
17610 tree op0
= RECUR (TREE_OPERAND (t
, 0));
17611 tree op1
= RECUR (TREE_OPERAND (t
, 1));
17612 RETURN (fold_build_pointer_plus (op0
, op1
));
17616 RETURN (tsubst_qualified_id (t
, args
, complain
, in_decl
, /*done=*/true,
17617 /*address_p=*/false));
17619 op1
= tsubst_non_call_postfix_expression (TREE_OPERAND (t
, 0),
17620 args
, complain
, in_decl
);
17621 RETURN (build_x_array_ref (EXPR_LOCATION (t
), op1
,
17622 RECUR (TREE_OPERAND (t
, 1)),
17623 complain
|decltype_flag
));
17626 if (PACK_EXPANSION_P (TREE_OPERAND (t
, 0))
17627 || ARGUMENT_PACK_P (TREE_OPERAND (t
, 0)))
17628 RETURN (tsubst_copy (t
, args
, complain
, in_decl
));
17635 op1
= TREE_OPERAND (t
, 0);
17636 if (TREE_CODE (t
) == SIZEOF_EXPR
&& SIZEOF_EXPR_TYPE_P (t
))
17637 op1
= TREE_TYPE (op1
);
17640 /* When there are no ARGS, we are trying to evaluate a
17641 non-dependent expression from the parser. Trying to do
17642 the substitutions may not work. */
17644 op1
= TREE_TYPE (op1
);
17648 ++cp_unevaluated_operand
;
17649 ++c_inhibit_evaluation_warnings
;
17651 op1
= tsubst (op1
, args
, complain
, in_decl
);
17653 op1
= tsubst_copy_and_build (op1
, args
, complain
, in_decl
,
17654 /*function_p=*/false,
17655 /*integral_constant_expression_p=*/
17657 --cp_unevaluated_operand
;
17658 --c_inhibit_evaluation_warnings
;
17661 r
= cxx_sizeof_or_alignof_type (op1
, TREE_CODE (t
),
17662 complain
& tf_error
);
17664 r
= cxx_sizeof_or_alignof_expr (op1
, TREE_CODE (t
),
17665 complain
& tf_error
);
17666 if (TREE_CODE (t
) == SIZEOF_EXPR
&& r
!= error_mark_node
)
17668 if (TREE_CODE (r
) != SIZEOF_EXPR
|| TYPE_P (op1
))
17670 if (!processing_template_decl
&& TYPE_P (op1
))
17672 r
= build_min (SIZEOF_EXPR
, size_type_node
,
17673 build1 (NOP_EXPR
, op1
, error_mark_node
));
17674 SIZEOF_EXPR_TYPE_P (r
) = 1;
17677 r
= build_min (SIZEOF_EXPR
, size_type_node
, op1
);
17678 TREE_SIDE_EFFECTS (r
) = 0;
17679 TREE_READONLY (r
) = 1;
17681 SET_EXPR_LOCATION (r
, EXPR_LOCATION (t
));
17686 case AT_ENCODE_EXPR
:
17688 op1
= TREE_OPERAND (t
, 0);
17689 ++cp_unevaluated_operand
;
17690 ++c_inhibit_evaluation_warnings
;
17691 op1
= tsubst_copy_and_build (op1
, args
, complain
, in_decl
,
17692 /*function_p=*/false,
17693 /*integral_constant_expression_p=*/false);
17694 --cp_unevaluated_operand
;
17695 --c_inhibit_evaluation_warnings
;
17696 RETURN (objc_build_encode_expr (op1
));
17699 case NOEXCEPT_EXPR
:
17700 op1
= TREE_OPERAND (t
, 0);
17701 ++cp_unevaluated_operand
;
17702 ++c_inhibit_evaluation_warnings
;
17703 ++cp_noexcept_operand
;
17704 op1
= tsubst_copy_and_build (op1
, args
, complain
, in_decl
,
17705 /*function_p=*/false,
17706 /*integral_constant_expression_p=*/false);
17707 --cp_unevaluated_operand
;
17708 --c_inhibit_evaluation_warnings
;
17709 --cp_noexcept_operand
;
17710 RETURN (finish_noexcept_expr (op1
, complain
));
17714 warning_sentinel
s(warn_div_by_zero
);
17715 tree lhs
= RECUR (TREE_OPERAND (t
, 0));
17716 tree rhs
= RECUR (TREE_OPERAND (t
, 2));
17717 tree r
= build_x_modify_expr
17718 (EXPR_LOCATION (t
), lhs
, TREE_CODE (TREE_OPERAND (t
, 1)), rhs
,
17719 complain
|decltype_flag
);
17720 /* TREE_NO_WARNING must be set if either the expression was
17721 parenthesized or it uses an operator such as >>= rather
17722 than plain assignment. In the former case, it was already
17723 set and must be copied. In the latter case,
17724 build_x_modify_expr sets it and it must not be reset
17726 if (TREE_NO_WARNING (t
))
17727 TREE_NO_WARNING (r
) = TREE_NO_WARNING (t
);
17733 op1
= tsubst_non_call_postfix_expression (TREE_OPERAND (t
, 0),
17734 args
, complain
, in_decl
);
17735 /* Remember that there was a reference to this entity. */
17737 && !mark_used (op1
, complain
) && !(complain
& tf_error
))
17738 RETURN (error_mark_node
);
17739 RETURN (build_x_arrow (input_location
, op1
, complain
));
17743 tree placement
= RECUR (TREE_OPERAND (t
, 0));
17744 tree init
= RECUR (TREE_OPERAND (t
, 3));
17745 vec
<tree
, va_gc
> *placement_vec
;
17746 vec
<tree
, va_gc
> *init_vec
;
17749 if (placement
== NULL_TREE
)
17750 placement_vec
= NULL
;
17753 placement_vec
= make_tree_vector ();
17754 for (; placement
!= NULL_TREE
; placement
= TREE_CHAIN (placement
))
17755 vec_safe_push (placement_vec
, TREE_VALUE (placement
));
17758 /* If there was an initializer in the original tree, but it
17759 instantiated to an empty list, then we should pass a
17760 non-NULL empty vector to tell build_new that it was an
17761 empty initializer() rather than no initializer. This can
17762 only happen when the initializer is a pack expansion whose
17763 parameter packs are of length zero. */
17764 if (init
== NULL_TREE
&& TREE_OPERAND (t
, 3) == NULL_TREE
)
17768 init_vec
= make_tree_vector ();
17769 if (init
== void_node
)
17770 gcc_assert (init_vec
!= NULL
);
17773 for (; init
!= NULL_TREE
; init
= TREE_CHAIN (init
))
17774 vec_safe_push (init_vec
, TREE_VALUE (init
));
17778 tree op1
= tsubst (TREE_OPERAND (t
, 1), args
, complain
, in_decl
);
17779 tree op2
= RECUR (TREE_OPERAND (t
, 2));
17780 ret
= build_new (&placement_vec
, op1
, op2
, &init_vec
,
17781 NEW_EXPR_USE_GLOBAL (t
),
17784 if (placement_vec
!= NULL
)
17785 release_tree_vector (placement_vec
);
17786 if (init_vec
!= NULL
)
17787 release_tree_vector (init_vec
);
17794 tree op0
= RECUR (TREE_OPERAND (t
, 0));
17795 tree op1
= RECUR (TREE_OPERAND (t
, 1));
17796 RETURN (delete_sanity (op0
, op1
,
17797 DELETE_EXPR_USE_VEC (t
),
17798 DELETE_EXPR_USE_GLOBAL (t
),
17802 case COMPOUND_EXPR
:
17804 tree op0
= tsubst_copy_and_build (TREE_OPERAND (t
, 0), args
,
17805 complain
& ~tf_decltype
, in_decl
,
17806 /*function_p=*/false,
17807 integral_constant_expression_p
);
17808 RETURN (build_x_compound_expr (EXPR_LOCATION (t
),
17810 RECUR (TREE_OPERAND (t
, 1)),
17811 complain
|decltype_flag
));
17817 vec
<tree
, va_gc
> *call_args
;
17818 unsigned int nargs
, i
;
17823 function
= CALL_EXPR_FN (t
);
17824 /* Internal function with no arguments. */
17825 if (function
== NULL_TREE
&& call_expr_nargs (t
) == 0)
17828 /* When we parsed the expression, we determined whether or
17829 not Koenig lookup should be performed. */
17830 koenig_p
= KOENIG_LOOKUP_P (t
);
17831 if (function
== NULL_TREE
)
17834 qualified_p
= false;
17836 else if (TREE_CODE (function
) == SCOPE_REF
)
17838 qualified_p
= true;
17839 function
= tsubst_qualified_id (function
, args
, complain
, in_decl
,
17841 /*address_p=*/false);
17843 else if (koenig_p
&& identifier_p (function
))
17845 /* Do nothing; calling tsubst_copy_and_build on an identifier
17846 would incorrectly perform unqualified lookup again.
17848 Note that we can also have an IDENTIFIER_NODE if the earlier
17849 unqualified lookup found a member function; in that case
17850 koenig_p will be false and we do want to do the lookup
17851 again to find the instantiated member function.
17853 FIXME but doing that causes c++/15272, so we need to stop
17854 using IDENTIFIER_NODE in that situation. */
17855 qualified_p
= false;
17859 if (TREE_CODE (function
) == COMPONENT_REF
)
17861 tree op
= TREE_OPERAND (function
, 1);
17863 qualified_p
= (TREE_CODE (op
) == SCOPE_REF
17864 || (BASELINK_P (op
)
17865 && BASELINK_QUALIFIED_P (op
)));
17868 qualified_p
= false;
17870 if (TREE_CODE (function
) == ADDR_EXPR
17871 && TREE_CODE (TREE_OPERAND (function
, 0)) == FUNCTION_DECL
)
17872 /* Avoid error about taking the address of a constructor. */
17873 function
= TREE_OPERAND (function
, 0);
17875 function
= tsubst_copy_and_build (function
, args
, complain
,
17878 integral_constant_expression_p
);
17880 if (BASELINK_P (function
))
17881 qualified_p
= true;
17884 nargs
= call_expr_nargs (t
);
17885 call_args
= make_tree_vector ();
17886 for (i
= 0; i
< nargs
; ++i
)
17888 tree arg
= CALL_EXPR_ARG (t
, i
);
17890 if (!PACK_EXPANSION_P (arg
))
17891 vec_safe_push (call_args
, RECUR (CALL_EXPR_ARG (t
, i
)));
17894 /* Expand the pack expansion and push each entry onto
17896 arg
= tsubst_pack_expansion (arg
, args
, complain
, in_decl
);
17897 if (TREE_CODE (arg
) == TREE_VEC
)
17899 unsigned int len
, j
;
17901 len
= TREE_VEC_LENGTH (arg
);
17902 for (j
= 0; j
< len
; ++j
)
17904 tree value
= TREE_VEC_ELT (arg
, j
);
17905 if (value
!= NULL_TREE
)
17906 value
= convert_from_reference (value
);
17907 vec_safe_push (call_args
, value
);
17912 /* A partial substitution. Add one entry. */
17913 vec_safe_push (call_args
, arg
);
17918 /* We do not perform argument-dependent lookup if normal
17919 lookup finds a non-function, in accordance with the
17920 expected resolution of DR 218. */
17922 && ((is_overloaded_fn (function
)
17923 /* If lookup found a member function, the Koenig lookup is
17924 not appropriate, even if an unqualified-name was used
17925 to denote the function. */
17926 && !DECL_FUNCTION_MEMBER_P (get_first_fn (function
)))
17927 || identifier_p (function
))
17928 /* Only do this when substitution turns a dependent call
17929 into a non-dependent call. */
17930 && type_dependent_expression_p_push (t
)
17931 && !any_type_dependent_arguments_p (call_args
))
17932 function
= perform_koenig_lookup (function
, call_args
, tf_none
);
17934 if (function
!= NULL_TREE
17935 && identifier_p (function
)
17936 && !any_type_dependent_arguments_p (call_args
))
17938 if (koenig_p
&& (complain
& tf_warning_or_error
))
17940 /* For backwards compatibility and good diagnostics, try
17941 the unqualified lookup again if we aren't in SFINAE
17943 tree unq
= (tsubst_copy_and_build
17944 (function
, args
, complain
, in_decl
, true,
17945 integral_constant_expression_p
));
17946 if (unq
== error_mark_node
)
17948 release_tree_vector (call_args
);
17949 RETURN (error_mark_node
);
17952 if (unq
!= function
)
17954 /* In a lambda fn, we have to be careful to not
17955 introduce new this captures. Legacy code can't
17956 be using lambdas anyway, so it's ok to be
17958 bool in_lambda
= (current_class_type
17959 && LAMBDA_TYPE_P (current_class_type
));
17960 char const *const msg
17961 = G_("%qD was not declared in this scope, "
17962 "and no declarations were found by "
17963 "argument-dependent lookup at the point "
17964 "of instantiation");
17968 error_at (EXPR_LOC_OR_LOC (t
, input_location
),
17971 diag
= permerror (EXPR_LOC_OR_LOC (t
, input_location
),
17977 if (INDIRECT_REF_P (fn
))
17978 fn
= TREE_OPERAND (fn
, 0);
17979 if (is_overloaded_fn (fn
))
17980 fn
= get_first_fn (fn
);
17983 /* Can't say anything more. */;
17984 else if (DECL_CLASS_SCOPE_P (fn
))
17986 location_t loc
= EXPR_LOC_OR_LOC (t
,
17989 "declarations in dependent base %qT are "
17990 "not found by unqualified lookup",
17991 DECL_CLASS_CONTEXT (fn
));
17992 if (current_class_ptr
)
17994 "use %<this->%D%> instead", function
);
17997 "use %<%T::%D%> instead",
17998 current_class_name
, function
);
18001 inform (DECL_SOURCE_LOCATION (fn
),
18002 "%qD declared here, later in the "
18003 "translation unit", fn
);
18006 release_tree_vector (call_args
);
18007 RETURN (error_mark_node
);
18014 if (identifier_p (function
))
18016 if (complain
& tf_error
)
18017 unqualified_name_lookup_error (function
);
18018 release_tree_vector (call_args
);
18019 RETURN (error_mark_node
);
18023 /* Remember that there was a reference to this entity. */
18024 if (function
!= NULL_TREE
18025 && DECL_P (function
)
18026 && !mark_used (function
, complain
) && !(complain
& tf_error
))
18028 release_tree_vector (call_args
);
18029 RETURN (error_mark_node
);
18032 /* Put back tf_decltype for the actual call. */
18033 complain
|= decltype_flag
;
18035 if (function
== NULL_TREE
)
18036 switch (CALL_EXPR_IFN (t
))
18039 gcc_assert (nargs
== 1);
18040 if (vec_safe_length (call_args
) != 1)
18042 error_at (EXPR_LOC_OR_LOC (t
, input_location
),
18043 "wrong number of arguments to "
18044 "%<__builtin_launder%>");
18045 ret
= error_mark_node
;
18048 ret
= finish_builtin_launder (EXPR_LOC_OR_LOC (t
,
18050 (*call_args
)[0], complain
);
18054 /* Unsupported internal function with arguments. */
18055 gcc_unreachable ();
18057 else if (TREE_CODE (function
) == OFFSET_REF
)
18058 ret
= build_offset_ref_call_from_tree (function
, &call_args
,
18060 else if (TREE_CODE (function
) == COMPONENT_REF
)
18062 tree instance
= TREE_OPERAND (function
, 0);
18063 tree fn
= TREE_OPERAND (function
, 1);
18065 if (processing_template_decl
18066 && (type_dependent_expression_p (instance
)
18067 || (!BASELINK_P (fn
)
18068 && TREE_CODE (fn
) != FIELD_DECL
)
18069 || type_dependent_expression_p (fn
)
18070 || any_type_dependent_arguments_p (call_args
)))
18071 ret
= build_min_nt_call_vec (function
, call_args
);
18072 else if (!BASELINK_P (fn
))
18073 ret
= finish_call_expr (function
, &call_args
,
18074 /*disallow_virtual=*/false,
18075 /*koenig_p=*/false,
18078 ret
= (build_new_method_call
18080 &call_args
, NULL_TREE
,
18081 qualified_p
? LOOKUP_NONVIRTUAL
: LOOKUP_NORMAL
,
18086 ret
= finish_call_expr (function
, &call_args
,
18087 /*disallow_virtual=*/qualified_p
,
18091 release_tree_vector (call_args
);
18093 if (ret
!= error_mark_node
)
18095 bool op
= CALL_EXPR_OPERATOR_SYNTAX (t
);
18096 bool ord
= CALL_EXPR_ORDERED_ARGS (t
);
18097 bool rev
= CALL_EXPR_REVERSE_ARGS (t
);
18098 bool thk
= CALL_FROM_THUNK_P (t
);
18099 if (op
|| ord
|| rev
|| thk
)
18101 function
= extract_call_expr (ret
);
18102 CALL_EXPR_OPERATOR_SYNTAX (function
) = op
;
18103 CALL_EXPR_ORDERED_ARGS (function
) = ord
;
18104 CALL_EXPR_REVERSE_ARGS (function
) = rev
;
18107 if (TREE_CODE (function
) == CALL_EXPR
)
18108 CALL_FROM_THUNK_P (function
) = true;
18110 AGGR_INIT_FROM_THUNK_P (function
) = true;
18111 /* The thunk location is not interesting. */
18112 SET_EXPR_LOCATION (function
, UNKNOWN_LOCATION
);
18122 tree cond
= RECUR (TREE_OPERAND (t
, 0));
18123 tree folded_cond
= fold_non_dependent_expr (cond
);
18126 if (TREE_CODE (folded_cond
) == INTEGER_CST
)
18128 if (integer_zerop (folded_cond
))
18130 ++c_inhibit_evaluation_warnings
;
18131 exp1
= RECUR (TREE_OPERAND (t
, 1));
18132 --c_inhibit_evaluation_warnings
;
18133 exp2
= RECUR (TREE_OPERAND (t
, 2));
18137 exp1
= RECUR (TREE_OPERAND (t
, 1));
18138 ++c_inhibit_evaluation_warnings
;
18139 exp2
= RECUR (TREE_OPERAND (t
, 2));
18140 --c_inhibit_evaluation_warnings
;
18142 cond
= folded_cond
;
18146 exp1
= RECUR (TREE_OPERAND (t
, 1));
18147 exp2
= RECUR (TREE_OPERAND (t
, 2));
18150 warning_sentinel
s(warn_duplicated_branches
);
18151 RETURN (build_x_conditional_expr (EXPR_LOCATION (t
),
18152 cond
, exp1
, exp2
, complain
));
18155 case PSEUDO_DTOR_EXPR
:
18157 tree op0
= RECUR (TREE_OPERAND (t
, 0));
18158 tree op1
= RECUR (TREE_OPERAND (t
, 1));
18159 tree op2
= tsubst (TREE_OPERAND (t
, 2), args
, complain
, in_decl
);
18160 RETURN (finish_pseudo_destructor_expr (op0
, op1
, op2
,
18166 tree purpose
, value
, chain
;
18168 if (t
== void_list_node
)
18171 if ((TREE_PURPOSE (t
) && PACK_EXPANSION_P (TREE_PURPOSE (t
)))
18172 || (TREE_VALUE (t
) && PACK_EXPANSION_P (TREE_VALUE (t
))))
18174 /* We have pack expansions, so expand those and
18175 create a new list out of it. */
18176 tree purposevec
= NULL_TREE
;
18177 tree valuevec
= NULL_TREE
;
18181 /* Expand the argument expressions. */
18182 if (TREE_PURPOSE (t
))
18183 purposevec
= tsubst_pack_expansion (TREE_PURPOSE (t
), args
,
18184 complain
, in_decl
);
18185 if (TREE_VALUE (t
))
18186 valuevec
= tsubst_pack_expansion (TREE_VALUE (t
), args
,
18187 complain
, in_decl
);
18189 /* Build the rest of the list. */
18190 chain
= TREE_CHAIN (t
);
18191 if (chain
&& chain
!= void_type_node
)
18192 chain
= RECUR (chain
);
18194 /* Determine the number of arguments. */
18195 if (purposevec
&& TREE_CODE (purposevec
) == TREE_VEC
)
18197 len
= TREE_VEC_LENGTH (purposevec
);
18198 gcc_assert (!valuevec
|| len
== TREE_VEC_LENGTH (valuevec
));
18200 else if (TREE_CODE (valuevec
) == TREE_VEC
)
18201 len
= TREE_VEC_LENGTH (valuevec
);
18204 /* Since we only performed a partial substitution into
18205 the argument pack, we only RETURN (a single list
18207 if (purposevec
== TREE_PURPOSE (t
)
18208 && valuevec
== TREE_VALUE (t
)
18209 && chain
== TREE_CHAIN (t
))
18212 RETURN (tree_cons (purposevec
, valuevec
, chain
));
18215 /* Convert the argument vectors into a TREE_LIST */
18219 /* Grab the Ith values. */
18221 purpose
= purposevec
? TREE_VEC_ELT (purposevec
, i
)
18224 = valuevec
? convert_from_reference (TREE_VEC_ELT (valuevec
, i
))
18227 /* Build the list (backwards). */
18228 chain
= tree_cons (purpose
, value
, chain
);
18234 purpose
= TREE_PURPOSE (t
);
18236 purpose
= RECUR (purpose
);
18237 value
= TREE_VALUE (t
);
18239 value
= RECUR (value
);
18240 chain
= TREE_CHAIN (t
);
18241 if (chain
&& chain
!= void_type_node
)
18242 chain
= RECUR (chain
);
18243 if (purpose
== TREE_PURPOSE (t
)
18244 && value
== TREE_VALUE (t
)
18245 && chain
== TREE_CHAIN (t
))
18247 RETURN (tree_cons (purpose
, value
, chain
));
18250 case COMPONENT_REF
:
18257 object
= tsubst_non_call_postfix_expression (TREE_OPERAND (t
, 0),
18258 args
, complain
, in_decl
);
18259 /* Remember that there was a reference to this entity. */
18260 if (DECL_P (object
)
18261 && !mark_used (object
, complain
) && !(complain
& tf_error
))
18262 RETURN (error_mark_node
);
18263 object_type
= TREE_TYPE (object
);
18265 member
= TREE_OPERAND (t
, 1);
18266 if (BASELINK_P (member
))
18267 member
= tsubst_baselink (member
,
18268 non_reference (TREE_TYPE (object
)),
18269 args
, complain
, in_decl
);
18271 member
= tsubst_copy (member
, args
, complain
, in_decl
);
18272 if (member
== error_mark_node
)
18273 RETURN (error_mark_node
);
18275 if (TREE_CODE (member
) == FIELD_DECL
)
18277 r
= finish_non_static_data_member (member
, object
, NULL_TREE
);
18278 if (TREE_CODE (r
) == COMPONENT_REF
)
18279 REF_PARENTHESIZED_P (r
) = REF_PARENTHESIZED_P (t
);
18282 else if (type_dependent_expression_p (object
))
18283 /* We can't do much here. */;
18284 else if (!CLASS_TYPE_P (object_type
))
18286 if (scalarish_type_p (object_type
))
18288 tree s
= NULL_TREE
;
18289 tree dtor
= member
;
18291 if (TREE_CODE (dtor
) == SCOPE_REF
)
18293 s
= TREE_OPERAND (dtor
, 0);
18294 dtor
= TREE_OPERAND (dtor
, 1);
18296 if (TREE_CODE (dtor
) == BIT_NOT_EXPR
)
18298 dtor
= TREE_OPERAND (dtor
, 0);
18300 RETURN (finish_pseudo_destructor_expr
18301 (object
, s
, dtor
, input_location
));
18305 else if (TREE_CODE (member
) == SCOPE_REF
18306 && TREE_CODE (TREE_OPERAND (member
, 1)) == TEMPLATE_ID_EXPR
)
18308 /* Lookup the template functions now that we know what the
18310 tree scope
= TREE_OPERAND (member
, 0);
18311 tree tmpl
= TREE_OPERAND (TREE_OPERAND (member
, 1), 0);
18312 tree args
= TREE_OPERAND (TREE_OPERAND (member
, 1), 1);
18313 member
= lookup_qualified_name (scope
, tmpl
,
18314 /*is_type_p=*/false,
18315 /*complain=*/false);
18316 if (BASELINK_P (member
))
18318 BASELINK_FUNCTIONS (member
)
18319 = build_nt (TEMPLATE_ID_EXPR
, BASELINK_FUNCTIONS (member
),
18321 member
= (adjust_result_of_qualified_name_lookup
18322 (member
, BINFO_TYPE (BASELINK_BINFO (member
)),
18327 qualified_name_lookup_error (scope
, tmpl
, member
,
18329 RETURN (error_mark_node
);
18332 else if (TREE_CODE (member
) == SCOPE_REF
18333 && !CLASS_TYPE_P (TREE_OPERAND (member
, 0))
18334 && TREE_CODE (TREE_OPERAND (member
, 0)) != NAMESPACE_DECL
)
18336 if (complain
& tf_error
)
18338 if (TYPE_P (TREE_OPERAND (member
, 0)))
18339 error ("%qT is not a class or namespace",
18340 TREE_OPERAND (member
, 0));
18342 error ("%qD is not a class or namespace",
18343 TREE_OPERAND (member
, 0));
18345 RETURN (error_mark_node
);
18348 r
= finish_class_member_access_expr (object
, member
,
18349 /*template_p=*/false,
18351 if (TREE_CODE (r
) == COMPONENT_REF
)
18352 REF_PARENTHESIZED_P (r
) = REF_PARENTHESIZED_P (t
);
18357 RETURN (build_throw
18358 (RECUR (TREE_OPERAND (t
, 0))));
18362 vec
<constructor_elt
, va_gc
> *n
;
18363 constructor_elt
*ce
;
18364 unsigned HOST_WIDE_INT idx
;
18365 tree type
= tsubst (TREE_TYPE (t
), args
, complain
, in_decl
);
18366 bool process_index_p
;
18368 bool need_copy_p
= false;
18371 if (type
== error_mark_node
)
18372 RETURN (error_mark_node
);
18374 /* We do not want to process the index of aggregate
18375 initializers as they are identifier nodes which will be
18376 looked up by digest_init. */
18377 process_index_p
= !(type
&& MAYBE_CLASS_TYPE_P (type
));
18379 n
= vec_safe_copy (CONSTRUCTOR_ELTS (t
));
18380 newlen
= vec_safe_length (n
);
18381 FOR_EACH_VEC_SAFE_ELT (n
, idx
, ce
)
18383 if (ce
->index
&& process_index_p
18384 /* An identifier index is looked up in the type
18385 being initialized, not the current scope. */
18386 && TREE_CODE (ce
->index
) != IDENTIFIER_NODE
)
18387 ce
->index
= RECUR (ce
->index
);
18389 if (PACK_EXPANSION_P (ce
->value
))
18391 /* Substitute into the pack expansion. */
18392 ce
->value
= tsubst_pack_expansion (ce
->value
, args
, complain
,
18395 if (ce
->value
== error_mark_node
18396 || PACK_EXPANSION_P (ce
->value
))
18398 else if (TREE_VEC_LENGTH (ce
->value
) == 1)
18399 /* Just move the argument into place. */
18400 ce
->value
= TREE_VEC_ELT (ce
->value
, 0);
18403 /* Update the length of the final CONSTRUCTOR
18404 arguments vector, and note that we will need to
18406 newlen
= newlen
+ TREE_VEC_LENGTH (ce
->value
) - 1;
18407 need_copy_p
= true;
18411 ce
->value
= RECUR (ce
->value
);
18416 vec
<constructor_elt
, va_gc
> *old_n
= n
;
18418 vec_alloc (n
, newlen
);
18419 FOR_EACH_VEC_ELT (*old_n
, idx
, ce
)
18421 if (TREE_CODE (ce
->value
) == TREE_VEC
)
18423 int i
, len
= TREE_VEC_LENGTH (ce
->value
);
18424 for (i
= 0; i
< len
; ++i
)
18425 CONSTRUCTOR_APPEND_ELT (n
, 0,
18426 TREE_VEC_ELT (ce
->value
, i
));
18429 CONSTRUCTOR_APPEND_ELT (n
, 0, ce
->value
);
18433 r
= build_constructor (init_list_type_node
, n
);
18434 CONSTRUCTOR_IS_DIRECT_INIT (r
) = CONSTRUCTOR_IS_DIRECT_INIT (t
);
18436 if (TREE_HAS_CONSTRUCTOR (t
))
18438 fcl_t cl
= fcl_functional
;
18439 if (CONSTRUCTOR_C99_COMPOUND_LITERAL (t
))
18441 RETURN (finish_compound_literal (type
, r
, complain
, cl
));
18444 TREE_TYPE (r
) = type
;
18450 tree operand_0
= TREE_OPERAND (t
, 0);
18451 if (TYPE_P (operand_0
))
18453 operand_0
= tsubst (operand_0
, args
, complain
, in_decl
);
18454 RETURN (get_typeid (operand_0
, complain
));
18458 operand_0
= RECUR (operand_0
);
18459 RETURN (build_typeid (operand_0
, complain
));
18470 tree r
= tsubst_copy (t
, args
, complain
, in_decl
);
18471 /* ??? We're doing a subset of finish_id_expression here. */
18473 && !processing_template_decl
18474 && !cp_unevaluated_operand
18475 && (TREE_STATIC (r
) || DECL_EXTERNAL (r
))
18476 && CP_DECL_THREAD_LOCAL_P (r
))
18478 if (tree wrap
= get_tls_wrapper_fn (r
))
18479 /* Replace an evaluated use of the thread_local variable with
18480 a call to its wrapper. */
18481 r
= build_cxx_call (wrap
, 0, NULL
, tf_warning_or_error
);
18483 else if (outer_automatic_var_p (r
))
18484 r
= process_outer_var_ref (r
, complain
);
18486 if (TREE_CODE (TREE_TYPE (t
)) != REFERENCE_TYPE
)
18487 /* If the original type was a reference, we'll be wrapped in
18488 the appropriate INDIRECT_REF. */
18489 r
= convert_from_reference (r
);
18495 tree op0
= RECUR (TREE_OPERAND (t
, 0));
18496 tree type
= tsubst (TREE_TYPE (t
), args
, complain
, in_decl
);
18497 RETURN (build_x_va_arg (EXPR_LOCATION (t
), op0
, type
));
18500 case OFFSETOF_EXPR
:
18503 = tsubst_copy_and_build (TREE_OPERAND (t
, 1), args
, complain
,
18504 in_decl
, /*function_p=*/false,
18505 /*integral_constant_expression_p=*/false);
18506 RETURN (finish_offsetof (object_ptr
,
18507 RECUR (TREE_OPERAND (t
, 0)),
18508 EXPR_LOCATION (t
)));
18511 case ADDRESSOF_EXPR
:
18512 RETURN (cp_build_addressof (EXPR_LOCATION (t
),
18513 RECUR (TREE_OPERAND (t
, 0)), complain
));
18517 tree type1
= tsubst (TRAIT_EXPR_TYPE1 (t
), args
,
18518 complain
, in_decl
);
18520 tree type2
= TRAIT_EXPR_TYPE2 (t
);
18521 if (type2
&& TREE_CODE (type2
) == TREE_LIST
)
18522 type2
= RECUR (type2
);
18524 type2
= tsubst (type2
, args
, complain
, in_decl
);
18526 RETURN (finish_trait_expr (TRAIT_EXPR_KIND (t
), type1
, type2
));
18531 tree old_stmt_expr
= cur_stmt_expr
;
18532 tree stmt_expr
= begin_stmt_expr ();
18534 cur_stmt_expr
= stmt_expr
;
18535 tsubst_expr (STMT_EXPR_STMT (t
), args
, complain
, in_decl
,
18536 integral_constant_expression_p
);
18537 stmt_expr
= finish_stmt_expr (stmt_expr
, false);
18538 cur_stmt_expr
= old_stmt_expr
;
18540 /* If the resulting list of expression statement is empty,
18541 fold it further into void_node. */
18542 if (empty_expr_stmt_p (stmt_expr
))
18543 stmt_expr
= void_node
;
18545 RETURN (stmt_expr
);
18550 tree r
= tsubst_lambda_expr (t
, args
, complain
, in_decl
);
18552 RETURN (build_lambda_object (r
));
18556 /* We can get here for a constant initializer of non-dependent type.
18557 FIXME stop folding in cp_parser_initializer_clause. */
18559 tree r
= get_target_expr_sfinae (RECUR (TARGET_EXPR_INITIAL (t
)),
18564 case TRANSACTION_EXPR
:
18565 RETURN (tsubst_expr(t
, args
, complain
, in_decl
,
18566 integral_constant_expression_p
));
18569 RETURN (finish_parenthesized_expr (RECUR (TREE_OPERAND (t
, 0))));
18571 case VEC_PERM_EXPR
:
18573 tree op0
= RECUR (TREE_OPERAND (t
, 0));
18574 tree op1
= RECUR (TREE_OPERAND (t
, 1));
18575 tree op2
= RECUR (TREE_OPERAND (t
, 2));
18576 RETURN (build_x_vec_perm_expr (input_location
, op0
, op1
, op2
,
18580 case REQUIRES_EXPR
:
18581 RETURN (tsubst_requires_expr (t
, args
, complain
, in_decl
));
18583 case NON_LVALUE_EXPR
:
18584 case VIEW_CONVERT_EXPR
:
18585 /* We should only see these for location wrapper nodes, or within
18586 instantiate_non_dependent_expr (when args is NULL_TREE). */
18587 gcc_assert (location_wrapper_p (t
) || args
== NULL_TREE
);
18588 if (location_wrapper_p (t
))
18589 RETURN (maybe_wrap_with_location (RECUR (TREE_OPERAND (t
, 0)),
18590 EXPR_LOCATION (t
)));
18594 /* Handle Objective-C++ constructs, if appropriate. */
18597 = objcp_tsubst_copy_and_build (t
, args
, complain
,
18598 in_decl
, /*function_p=*/false);
18602 RETURN (tsubst_copy (t
, args
, complain
, in_decl
));
18608 input_location
= loc
;
18612 /* Verify that the instantiated ARGS are valid. For type arguments,
18613 make sure that the type's linkage is ok. For non-type arguments,
18614 make sure they are constants if they are integral or enumerations.
18615 Emit an error under control of COMPLAIN, and return TRUE on error. */
18618 check_instantiated_arg (tree tmpl
, tree t
, tsubst_flags_t complain
)
18620 if (dependent_template_arg_p (t
))
18622 if (ARGUMENT_PACK_P (t
))
18624 tree vec
= ARGUMENT_PACK_ARGS (t
);
18625 int len
= TREE_VEC_LENGTH (vec
);
18626 bool result
= false;
18629 for (i
= 0; i
< len
; ++i
)
18630 if (check_instantiated_arg (tmpl
, TREE_VEC_ELT (vec
, i
), complain
))
18634 else if (TYPE_P (t
))
18636 /* [basic.link]: A name with no linkage (notably, the name
18637 of a class or enumeration declared in a local scope)
18638 shall not be used to declare an entity with linkage.
18639 This implies that names with no linkage cannot be used as
18642 DR 757 relaxes this restriction for C++0x. */
18643 tree nt
= (cxx_dialect
> cxx98
? NULL_TREE
18644 : no_linkage_check (t
, /*relaxed_p=*/false));
18648 /* DR 488 makes use of a type with no linkage cause
18649 type deduction to fail. */
18650 if (complain
& tf_error
)
18652 if (TYPE_UNNAMED_P (nt
))
18653 error ("%qT is/uses unnamed type", t
);
18655 error ("template argument for %qD uses local type %qT",
18660 /* In order to avoid all sorts of complications, we do not
18661 allow variably-modified types as template arguments. */
18662 else if (variably_modified_type_p (t
, NULL_TREE
))
18664 if (complain
& tf_error
)
18665 error ("%qT is a variably modified type", t
);
18669 /* Class template and alias template arguments should be OK. */
18670 else if (DECL_TYPE_TEMPLATE_P (t
))
18672 /* A non-type argument of integral or enumerated type must be a
18674 else if (TREE_TYPE (t
)
18675 && INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (t
))
18676 && !REFERENCE_REF_P (t
)
18677 && !TREE_CONSTANT (t
))
18679 if (complain
& tf_error
)
18680 error ("integral expression %qE is not constant", t
);
18687 check_instantiated_args (tree tmpl
, tree args
, tsubst_flags_t complain
)
18689 int ix
, len
= DECL_NTPARMS (tmpl
);
18690 bool result
= false;
18692 for (ix
= 0; ix
!= len
; ix
++)
18694 if (check_instantiated_arg (tmpl
, TREE_VEC_ELT (args
, ix
), complain
))
18697 if (result
&& (complain
& tf_error
))
18698 error (" trying to instantiate %qD", tmpl
);
18702 /* We're out of SFINAE context now, so generate diagnostics for the access
18703 errors we saw earlier when instantiating D from TMPL and ARGS. */
18706 recheck_decl_substitution (tree d
, tree tmpl
, tree args
)
18708 tree pattern
= DECL_TEMPLATE_RESULT (tmpl
);
18709 tree type
= TREE_TYPE (pattern
);
18710 location_t loc
= input_location
;
18712 push_access_scope (d
);
18713 push_deferring_access_checks (dk_no_deferred
);
18714 input_location
= DECL_SOURCE_LOCATION (pattern
);
18715 tsubst (type
, args
, tf_warning_or_error
, d
);
18716 input_location
= loc
;
18717 pop_deferring_access_checks ();
18718 pop_access_scope (d
);
18721 /* Instantiate the indicated variable, function, or alias template TMPL with
18722 the template arguments in TARG_PTR. */
18725 instantiate_template_1 (tree tmpl
, tree orig_args
, tsubst_flags_t complain
)
18727 tree targ_ptr
= orig_args
;
18731 bool access_ok
= true;
18733 if (tmpl
== error_mark_node
)
18734 return error_mark_node
;
18736 gcc_assert (TREE_CODE (tmpl
) == TEMPLATE_DECL
);
18738 /* If this function is a clone, handle it specially. */
18739 if (DECL_CLONED_FUNCTION_P (tmpl
))
18744 /* Use DECL_ABSTRACT_ORIGIN because only FUNCTION_DECLs have
18745 DECL_CLONED_FUNCTION. */
18746 spec
= instantiate_template (DECL_ABSTRACT_ORIGIN (tmpl
),
18747 targ_ptr
, complain
);
18748 if (spec
== error_mark_node
)
18749 return error_mark_node
;
18751 /* Look for the clone. */
18752 FOR_EACH_CLONE (clone
, spec
)
18753 if (DECL_NAME (clone
) == DECL_NAME (tmpl
))
18755 /* We should always have found the clone by now. */
18756 gcc_unreachable ();
18760 if (targ_ptr
== error_mark_node
)
18761 return error_mark_node
;
18763 /* Check to see if we already have this specialization. */
18764 gen_tmpl
= most_general_template (tmpl
);
18765 if (TMPL_ARGS_DEPTH (targ_ptr
)
18766 < TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (gen_tmpl
)))
18767 /* targ_ptr only has the innermost template args, so add the outer ones
18768 from tmpl, which could be either a partial instantiation or gen_tmpl (in
18769 the case of a non-dependent call within a template definition). */
18770 targ_ptr
= (add_outermost_template_args
18771 (DECL_TI_ARGS (DECL_TEMPLATE_RESULT (tmpl
)),
18774 /* It would be nice to avoid hashing here and then again in tsubst_decl,
18775 but it doesn't seem to be on the hot path. */
18776 spec
= retrieve_specialization (gen_tmpl
, targ_ptr
, 0);
18778 gcc_assert (tmpl
== gen_tmpl
18779 || ((fndecl
= retrieve_specialization (tmpl
, orig_args
, 0))
18781 || fndecl
== NULL_TREE
);
18783 if (spec
!= NULL_TREE
)
18785 if (FNDECL_HAS_ACCESS_ERRORS (spec
))
18787 if (complain
& tf_error
)
18788 recheck_decl_substitution (spec
, gen_tmpl
, targ_ptr
);
18789 return error_mark_node
;
18794 if (check_instantiated_args (gen_tmpl
, INNERMOST_TEMPLATE_ARGS (targ_ptr
),
18796 return error_mark_node
;
18798 /* We are building a FUNCTION_DECL, during which the access of its
18799 parameters and return types have to be checked. However this
18800 FUNCTION_DECL which is the desired context for access checking
18801 is not built yet. We solve this chicken-and-egg problem by
18802 deferring all checks until we have the FUNCTION_DECL. */
18803 push_deferring_access_checks (dk_deferred
);
18805 /* Instantiation of the function happens in the context of the function
18806 template, not the context of the overload resolution we're doing. */
18807 push_to_top_level ();
18808 /* If there are dependent arguments, e.g. because we're doing partial
18809 ordering, make sure processing_template_decl stays set. */
18810 if (uses_template_parms (targ_ptr
))
18811 ++processing_template_decl
;
18812 if (DECL_CLASS_SCOPE_P (gen_tmpl
))
18814 tree ctx
= tsubst_aggr_type (DECL_CONTEXT (gen_tmpl
), targ_ptr
,
18815 complain
, gen_tmpl
, true);
18816 push_nested_class (ctx
);
18819 tree pattern
= DECL_TEMPLATE_RESULT (gen_tmpl
);
18821 fndecl
= NULL_TREE
;
18822 if (VAR_P (pattern
))
18824 /* We need to determine if we're using a partial or explicit
18825 specialization now, because the type of the variable could be
18827 tree tid
= lookup_template_variable (gen_tmpl
, targ_ptr
);
18828 tree elt
= most_specialized_partial_spec (tid
, complain
);
18829 if (elt
== error_mark_node
)
18830 pattern
= error_mark_node
;
18833 tree partial_tmpl
= TREE_VALUE (elt
);
18834 tree partial_args
= TREE_PURPOSE (elt
);
18835 tree partial_pat
= DECL_TEMPLATE_RESULT (partial_tmpl
);
18836 fndecl
= tsubst (partial_pat
, partial_args
, complain
, gen_tmpl
);
18840 /* Substitute template parameters to obtain the specialization. */
18841 if (fndecl
== NULL_TREE
)
18842 fndecl
= tsubst (pattern
, targ_ptr
, complain
, gen_tmpl
);
18843 if (DECL_CLASS_SCOPE_P (gen_tmpl
))
18844 pop_nested_class ();
18845 pop_from_top_level ();
18847 if (fndecl
== error_mark_node
)
18849 pop_deferring_access_checks ();
18850 return error_mark_node
;
18853 /* The DECL_TI_TEMPLATE should always be the immediate parent
18854 template, not the most general template. */
18855 DECL_TI_TEMPLATE (fndecl
) = tmpl
;
18856 DECL_TI_ARGS (fndecl
) = targ_ptr
;
18858 /* Now we know the specialization, compute access previously
18859 deferred. Do no access control for inheriting constructors,
18860 as we already checked access for the inherited constructor. */
18861 if (!(flag_new_inheriting_ctors
18862 && DECL_INHERITED_CTOR (fndecl
)))
18864 push_access_scope (fndecl
);
18865 if (!perform_deferred_access_checks (complain
))
18867 pop_access_scope (fndecl
);
18869 pop_deferring_access_checks ();
18871 /* If we've just instantiated the main entry point for a function,
18872 instantiate all the alternate entry points as well. We do this
18873 by cloning the instantiation of the main entry point, not by
18874 instantiating the template clones. */
18875 if (DECL_CHAIN (gen_tmpl
) && DECL_CLONED_FUNCTION_P (DECL_CHAIN (gen_tmpl
)))
18876 clone_function_decl (fndecl
, /*update_methods=*/false);
18880 if (!(complain
& tf_error
))
18882 /* Remember to reinstantiate when we're out of SFINAE so the user
18883 can see the errors. */
18884 FNDECL_HAS_ACCESS_ERRORS (fndecl
) = true;
18886 return error_mark_node
;
18891 /* Wrapper for instantiate_template_1. */
18894 instantiate_template (tree tmpl
, tree orig_args
, tsubst_flags_t complain
)
18897 timevar_push (TV_TEMPLATE_INST
);
18898 ret
= instantiate_template_1 (tmpl
, orig_args
, complain
);
18899 timevar_pop (TV_TEMPLATE_INST
);
18903 /* Instantiate the alias template TMPL with ARGS. Also push a template
18904 instantiation level, which instantiate_template doesn't do because
18905 functions and variables have sufficient context established by the
18909 instantiate_alias_template (tree tmpl
, tree args
, tsubst_flags_t complain
)
18911 struct pending_template
*old_last_pend
= last_pending_template
;
18912 struct tinst_level
*old_error_tinst
= last_error_tinst_level
;
18913 if (tmpl
== error_mark_node
|| args
== error_mark_node
)
18914 return error_mark_node
;
18915 tree tinst
= build_tree_list (tmpl
, args
);
18916 if (!push_tinst_level (tinst
))
18919 return error_mark_node
;
18923 coerce_innermost_template_parms (DECL_TEMPLATE_PARMS (tmpl
),
18924 args
, tmpl
, complain
,
18925 /*require_all_args=*/true,
18926 /*use_default_args=*/true);
18928 tree r
= instantiate_template (tmpl
, args
, complain
);
18929 pop_tinst_level ();
18930 /* We can't free this if a pending_template entry or last_error_tinst_level
18931 is pointing at it. */
18932 if (last_pending_template
== old_last_pend
18933 && last_error_tinst_level
== old_error_tinst
)
18939 /* PARM is a template parameter pack for FN. Returns true iff
18940 PARM is used in a deducible way in the argument list of FN. */
18943 pack_deducible_p (tree parm
, tree fn
)
18945 tree t
= FUNCTION_FIRST_USER_PARMTYPE (fn
);
18946 for (; t
; t
= TREE_CHAIN (t
))
18948 tree type
= TREE_VALUE (t
);
18950 if (!PACK_EXPANSION_P (type
))
18952 for (packs
= PACK_EXPANSION_PARAMETER_PACKS (type
);
18953 packs
; packs
= TREE_CHAIN (packs
))
18954 if (template_args_equal (TREE_VALUE (packs
), parm
))
18956 /* The template parameter pack is used in a function parameter
18957 pack. If this is the end of the parameter list, the
18958 template parameter pack is deducible. */
18959 if (TREE_CHAIN (t
) == void_list_node
)
18962 /* Otherwise, not. Well, it could be deduced from
18963 a non-pack parameter, but doing so would end up with
18964 a deduction mismatch, so don't bother. */
18968 /* The template parameter pack isn't used in any function parameter
18969 packs, but it might be used deeper, e.g. tuple<Args...>. */
18973 /* The FN is a TEMPLATE_DECL for a function. ARGS is an array with
18974 NARGS elements of the arguments that are being used when calling
18975 it. TARGS is a vector into which the deduced template arguments
18978 Returns either a FUNCTION_DECL for the matching specialization of FN or
18979 NULL_TREE if no suitable specialization can be found. If EXPLAIN_P is
18980 true, diagnostics will be printed to explain why it failed.
18982 If FN is a conversion operator, or we are trying to produce a specific
18983 specialization, RETURN_TYPE is the return type desired.
18985 The EXPLICIT_TARGS are explicit template arguments provided via a
18988 The parameter STRICT is one of:
18991 We are deducing arguments for a function call, as in
18992 [temp.deduct.call]. If RETURN_TYPE is non-null, we are
18993 deducing arguments for a call to the result of a conversion
18994 function template, as in [over.call.object].
18997 We are deducing arguments for a conversion function, as in
18998 [temp.deduct.conv].
19001 We are deducing arguments when doing an explicit instantiation
19002 as in [temp.explicit], when determining an explicit specialization
19003 as in [temp.expl.spec], or when taking the address of a function
19004 template, as in [temp.deduct.funcaddr]. */
19007 fn_type_unification (tree fn
,
19008 tree explicit_targs
,
19011 unsigned int nargs
,
19013 unification_kind_t strict
,
19020 tree decl
= NULL_TREE
;
19021 tsubst_flags_t complain
= (explain_p
? tf_warning_or_error
: tf_none
);
19023 static int deduction_depth
;
19024 struct pending_template
*old_last_pend
= last_pending_template
;
19025 struct tinst_level
*old_error_tinst
= last_error_tinst_level
;
19028 if (flag_new_inheriting_ctors
)
19029 fn
= strip_inheriting_ctors (fn
);
19031 tree tparms
= DECL_INNERMOST_TEMPLATE_PARMS (fn
);
19033 tree r
= error_mark_node
;
19035 tree full_targs
= targs
;
19036 if (TMPL_ARGS_DEPTH (targs
)
19037 < TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (fn
)))
19038 full_targs
= (add_outermost_template_args
19039 (DECL_TI_ARGS (DECL_TEMPLATE_RESULT (fn
)),
19043 complain
|= tf_decltype
;
19045 /* In C++0x, it's possible to have a function template whose type depends
19046 on itself recursively. This is most obvious with decltype, but can also
19047 occur with enumeration scope (c++/48969). So we need to catch infinite
19048 recursion and reject the substitution at deduction time; this function
19049 will return error_mark_node for any repeated substitution.
19051 This also catches excessive recursion such as when f<N> depends on
19052 f<N-1> across all integers, and returns error_mark_node for all the
19053 substitutions back up to the initial one.
19055 This is, of course, not reentrant. */
19056 if (excessive_deduction_depth
)
19057 return error_mark_node
;
19058 tinst
= build_tree_list (fn
, NULL_TREE
);
19061 gcc_assert (TREE_CODE (fn
) == TEMPLATE_DECL
);
19063 fntype
= TREE_TYPE (fn
);
19064 if (explicit_targs
)
19068 The specified template arguments must match the template
19069 parameters in kind (i.e., type, nontype, template), and there
19070 must not be more arguments than there are parameters;
19071 otherwise type deduction fails.
19073 Nontype arguments must match the types of the corresponding
19074 nontype template parameters, or must be convertible to the
19075 types of the corresponding nontype parameters as specified in
19076 _temp.arg.nontype_, otherwise type deduction fails.
19078 All references in the function type of the function template
19079 to the corresponding template parameters are replaced by the
19080 specified template argument values. If a substitution in a
19081 template parameter or in the function type of the function
19082 template results in an invalid type, type deduction fails. */
19083 int i
, len
= TREE_VEC_LENGTH (tparms
);
19084 location_t loc
= input_location
;
19085 bool incomplete
= false;
19087 if (explicit_targs
== error_mark_node
)
19090 if (TMPL_ARGS_DEPTH (explicit_targs
)
19091 < TMPL_ARGS_DEPTH (full_targs
))
19092 explicit_targs
= add_outermost_template_args (full_targs
,
19095 /* Adjust any explicit template arguments before entering the
19096 substitution context. */
19098 = (coerce_template_parms (tparms
, explicit_targs
, NULL_TREE
,
19100 /*require_all_args=*/false,
19101 /*use_default_args=*/false));
19102 if (explicit_targs
== error_mark_node
)
19105 /* Substitute the explicit args into the function type. This is
19106 necessary so that, for instance, explicitly declared function
19107 arguments can match null pointed constants. If we were given
19108 an incomplete set of explicit args, we must not do semantic
19109 processing during substitution as we could create partial
19111 for (i
= 0; i
< len
; i
++)
19113 tree parm
= TREE_VALUE (TREE_VEC_ELT (tparms
, i
));
19114 bool parameter_pack
= false;
19115 tree targ
= TREE_VEC_ELT (explicit_targs
, i
);
19117 /* Dig out the actual parm. */
19118 if (TREE_CODE (parm
) == TYPE_DECL
19119 || TREE_CODE (parm
) == TEMPLATE_DECL
)
19121 parm
= TREE_TYPE (parm
);
19122 parameter_pack
= TEMPLATE_TYPE_PARAMETER_PACK (parm
);
19124 else if (TREE_CODE (parm
) == PARM_DECL
)
19126 parm
= DECL_INITIAL (parm
);
19127 parameter_pack
= TEMPLATE_PARM_PARAMETER_PACK (parm
);
19130 if (!parameter_pack
&& targ
== NULL_TREE
)
19131 /* No explicit argument for this template parameter. */
19134 if (parameter_pack
&& pack_deducible_p (parm
, fn
))
19136 /* Mark the argument pack as "incomplete". We could
19137 still deduce more arguments during unification.
19138 We remove this mark in type_unification_real. */
19141 ARGUMENT_PACK_INCOMPLETE_P(targ
) = 1;
19142 ARGUMENT_PACK_EXPLICIT_ARGS (targ
)
19143 = ARGUMENT_PACK_ARGS (targ
);
19146 /* We have some incomplete argument packs. */
19151 TREE_VALUE (tinst
) = explicit_targs
;
19152 if (!push_tinst_level (tinst
))
19154 excessive_deduction_depth
= true;
19157 processing_template_decl
+= incomplete
;
19158 input_location
= DECL_SOURCE_LOCATION (fn
);
19159 /* Ignore any access checks; we'll see them again in
19160 instantiate_template and they might have the wrong
19161 access path at this point. */
19162 push_deferring_access_checks (dk_deferred
);
19163 fntype
= tsubst (TREE_TYPE (fn
), explicit_targs
,
19164 complain
| tf_partial
| tf_fndecl_type
, NULL_TREE
);
19165 pop_deferring_access_checks ();
19166 input_location
= loc
;
19167 processing_template_decl
-= incomplete
;
19168 pop_tinst_level ();
19170 if (fntype
== error_mark_node
)
19173 /* Place the explicitly specified arguments in TARGS. */
19174 explicit_targs
= INNERMOST_TEMPLATE_ARGS (explicit_targs
);
19175 for (i
= NUM_TMPL_ARGS (explicit_targs
); i
--;)
19176 TREE_VEC_ELT (targs
, i
) = TREE_VEC_ELT (explicit_targs
, i
);
19179 /* Never do unification on the 'this' parameter. */
19180 parms
= skip_artificial_parms_for (fn
, TYPE_ARG_TYPES (fntype
));
19182 if (return_type
&& strict
== DEDUCE_CALL
)
19184 /* We're deducing for a call to the result of a template conversion
19185 function. The parms we really want are in return_type. */
19186 if (POINTER_TYPE_P (return_type
))
19187 return_type
= TREE_TYPE (return_type
);
19188 parms
= TYPE_ARG_TYPES (return_type
);
19190 else if (return_type
)
19194 parms
= tree_cons (NULL_TREE
, TREE_TYPE (fntype
), parms
);
19195 new_args
= XALLOCAVEC (tree
, nargs
+ 1);
19196 new_args
[0] = return_type
;
19197 memcpy (new_args
+ 1, args
, nargs
* sizeof (tree
));
19202 /* We allow incomplete unification without an error message here
19203 because the standard doesn't seem to explicitly prohibit it. Our
19204 callers must be ready to deal with unification failures in any
19207 TREE_VALUE (tinst
) = targs
;
19208 /* If we aren't explaining yet, push tinst context so we can see where
19209 any errors (e.g. from class instantiations triggered by instantiation
19210 of default template arguments) come from. If we are explaining, this
19211 context is redundant. */
19212 if (!explain_p
&& !push_tinst_level (tinst
))
19214 excessive_deduction_depth
= true;
19218 /* type_unification_real will pass back any access checks from default
19219 template argument substitution. */
19220 vec
<deferred_access_check
, va_gc
> *checks
;
19223 ok
= !type_unification_real (DECL_INNERMOST_TEMPLATE_PARMS (fn
),
19224 full_targs
, parms
, args
, nargs
, /*subr=*/0,
19225 strict
, flags
, &checks
, explain_p
);
19227 pop_tinst_level ();
19231 /* Now that we have bindings for all of the template arguments,
19232 ensure that the arguments deduced for the template template
19233 parameters have compatible template parameter lists. We cannot
19234 check this property before we have deduced all template
19235 arguments, because the template parameter types of a template
19236 template parameter might depend on prior template parameters
19237 deduced after the template template parameter. The following
19238 ill-formed example illustrates this issue:
19240 template<typename T, template<T> class C> void f(C<5>, T);
19242 template<int N> struct X {};
19245 f(X<5>(), 5l); // error: template argument deduction fails
19248 The template parameter list of 'C' depends on the template type
19249 parameter 'T', but 'C' is deduced to 'X' before 'T' is deduced to
19250 'long'. Thus, we can't check that 'C' cannot bind to 'X' at the
19251 time that we deduce 'C'. */
19252 if (!template_template_parm_bindings_ok_p
19253 (DECL_INNERMOST_TEMPLATE_PARMS (fn
), targs
))
19255 unify_inconsistent_template_template_parameters (explain_p
);
19259 /* All is well so far. Now, check:
19263 When all template arguments have been deduced, all uses of
19264 template parameters in nondeduced contexts are replaced with
19265 the corresponding deduced argument values. If the
19266 substitution results in an invalid type, as described above,
19267 type deduction fails. */
19268 TREE_VALUE (tinst
) = targs
;
19269 if (!push_tinst_level (tinst
))
19271 excessive_deduction_depth
= true;
19275 /* Also collect access checks from the instantiation. */
19276 reopen_deferring_access_checks (checks
);
19278 decl
= instantiate_template (fn
, targs
, complain
);
19280 checks
= get_deferred_access_checks ();
19281 pop_deferring_access_checks ();
19283 pop_tinst_level ();
19285 if (decl
== error_mark_node
)
19288 /* Now perform any access checks encountered during substitution. */
19289 push_access_scope (decl
);
19290 ok
= perform_access_checks (checks
, complain
);
19291 pop_access_scope (decl
);
19295 /* If we're looking for an exact match, check that what we got
19296 is indeed an exact match. It might not be if some template
19297 parameters are used in non-deduced contexts. But don't check
19298 for an exact match if we have dependent template arguments;
19299 in that case we're doing partial ordering, and we already know
19300 that we have two candidates that will provide the actual type. */
19301 if (strict
== DEDUCE_EXACT
&& !any_dependent_template_arguments_p (targs
))
19303 tree substed
= TREE_TYPE (decl
);
19307 = skip_artificial_parms_for (decl
, TYPE_ARG_TYPES (substed
));
19309 sarg
= tree_cons (NULL_TREE
, TREE_TYPE (substed
), sarg
);
19310 for (i
= 0; i
< nargs
&& sarg
; ++i
, sarg
= TREE_CHAIN (sarg
))
19311 if (!same_type_p (args
[i
], TREE_VALUE (sarg
)))
19313 unify_type_mismatch (explain_p
, args
[i
],
19314 TREE_VALUE (sarg
));
19319 /* After doing deduction with the inherited constructor, actually return an
19320 instantiation of the inheriting constructor. */
19322 decl
= instantiate_template (orig_fn
, targs
, complain
);
19328 if (excessive_deduction_depth
)
19330 if (deduction_depth
== 0)
19331 /* Reset once we're all the way out. */
19332 excessive_deduction_depth
= false;
19335 /* We can't free this if a pending_template entry or last_error_tinst_level
19336 is pointing at it. */
19337 if (last_pending_template
== old_last_pend
19338 && last_error_tinst_level
== old_error_tinst
)
19344 /* Adjust types before performing type deduction, as described in
19345 [temp.deduct.call] and [temp.deduct.conv]. The rules in these two
19346 sections are symmetric. PARM is the type of a function parameter
19347 or the return type of the conversion function. ARG is the type of
19348 the argument passed to the call, or the type of the value
19349 initialized with the result of the conversion function.
19350 ARG_EXPR is the original argument expression, which may be null. */
19353 maybe_adjust_types_for_deduction (unification_kind_t strict
,
19366 /* Swap PARM and ARG throughout the remainder of this
19367 function; the handling is precisely symmetric since PARM
19368 will initialize ARG rather than vice versa. */
19369 std::swap (parm
, arg
);
19373 /* Core issue #873: Do the DR606 thing (see below) for these cases,
19374 too, but here handle it by stripping the reference from PARM
19375 rather than by adding it to ARG. */
19376 if (TREE_CODE (*parm
) == REFERENCE_TYPE
19377 && TYPE_REF_IS_RVALUE (*parm
)
19378 && TREE_CODE (TREE_TYPE (*parm
)) == TEMPLATE_TYPE_PARM
19379 && cp_type_quals (TREE_TYPE (*parm
)) == TYPE_UNQUALIFIED
19380 && TREE_CODE (*arg
) == REFERENCE_TYPE
19381 && !TYPE_REF_IS_RVALUE (*arg
))
19382 *parm
= TREE_TYPE (*parm
);
19383 /* Nothing else to do in this case. */
19387 gcc_unreachable ();
19390 if (TREE_CODE (*parm
) != REFERENCE_TYPE
)
19392 /* [temp.deduct.call]
19394 If P is not a reference type:
19396 --If A is an array type, the pointer type produced by the
19397 array-to-pointer standard conversion (_conv.array_) is
19398 used in place of A for type deduction; otherwise,
19400 --If A is a function type, the pointer type produced by
19401 the function-to-pointer standard conversion
19402 (_conv.func_) is used in place of A for type deduction;
19405 --If A is a cv-qualified type, the top level
19406 cv-qualifiers of A's type are ignored for type
19408 if (TREE_CODE (*arg
) == ARRAY_TYPE
)
19409 *arg
= build_pointer_type (TREE_TYPE (*arg
));
19410 else if (TREE_CODE (*arg
) == FUNCTION_TYPE
)
19411 *arg
= build_pointer_type (*arg
);
19413 *arg
= TYPE_MAIN_VARIANT (*arg
);
19416 /* [14.8.2.1/3 temp.deduct.call], "A forwarding reference is an rvalue
19417 reference to a cv-unqualified template parameter that does not represent a
19418 template parameter of a class template (during class template argument
19419 deduction (13.3.1.8)). If P is a forwarding reference and the argument is
19420 an lvalue, the type "lvalue reference to A" is used in place of A for type
19422 if (TREE_CODE (*parm
) == REFERENCE_TYPE
19423 && TYPE_REF_IS_RVALUE (*parm
)
19424 && TREE_CODE (TREE_TYPE (*parm
)) == TEMPLATE_TYPE_PARM
19425 && !TEMPLATE_TYPE_PARM_FOR_CLASS (TREE_TYPE (*parm
))
19426 && cp_type_quals (TREE_TYPE (*parm
)) == TYPE_UNQUALIFIED
19427 && (arg_expr
? lvalue_p (arg_expr
)
19428 /* try_one_overload doesn't provide an arg_expr, but
19429 functions are always lvalues. */
19430 : TREE_CODE (*arg
) == FUNCTION_TYPE
))
19431 *arg
= build_reference_type (*arg
);
19433 /* [temp.deduct.call]
19435 If P is a cv-qualified type, the top level cv-qualifiers
19436 of P's type are ignored for type deduction. If P is a
19437 reference type, the type referred to by P is used for
19439 *parm
= TYPE_MAIN_VARIANT (*parm
);
19440 if (TREE_CODE (*parm
) == REFERENCE_TYPE
)
19442 *parm
= TREE_TYPE (*parm
);
19443 result
|= UNIFY_ALLOW_OUTER_MORE_CV_QUAL
;
19446 /* DR 322. For conversion deduction, remove a reference type on parm
19447 too (which has been swapped into ARG). */
19448 if (strict
== DEDUCE_CONV
&& TREE_CODE (*arg
) == REFERENCE_TYPE
)
19449 *arg
= TREE_TYPE (*arg
);
19454 /* Subroutine of unify_one_argument. PARM is a function parameter of a
19455 template which does contain any deducible template parameters; check if
19456 ARG is a suitable match for it. STRICT, FLAGS and EXPLAIN_P are as in
19457 unify_one_argument. */
19460 check_non_deducible_conversion (tree parm
, tree arg
, int strict
,
19461 int flags
, bool explain_p
)
19466 type
= TREE_TYPE (arg
);
19470 if (same_type_p (parm
, type
))
19471 return unify_success (explain_p
);
19473 if (strict
== DEDUCE_CONV
)
19475 if (can_convert_arg (type
, parm
, NULL_TREE
, flags
,
19476 explain_p
? tf_warning_or_error
: tf_none
))
19477 return unify_success (explain_p
);
19479 else if (strict
!= DEDUCE_EXACT
)
19481 if (can_convert_arg (parm
, type
,
19482 TYPE_P (arg
) ? NULL_TREE
: arg
,
19483 flags
, explain_p
? tf_warning_or_error
: tf_none
))
19484 return unify_success (explain_p
);
19487 if (strict
== DEDUCE_EXACT
)
19488 return unify_type_mismatch (explain_p
, parm
, arg
);
19490 return unify_arg_conversion (explain_p
, parm
, type
, arg
);
19493 static bool uses_deducible_template_parms (tree type
);
19495 /* Returns true iff the expression EXPR is one from which a template
19496 argument can be deduced. In other words, if it's an undecorated
19497 use of a template non-type parameter. */
19500 deducible_expression (tree expr
)
19502 /* Strip implicit conversions. */
19503 while (CONVERT_EXPR_P (expr
))
19504 expr
= TREE_OPERAND (expr
, 0);
19505 return (TREE_CODE (expr
) == TEMPLATE_PARM_INDEX
);
19508 /* Returns true iff the array domain DOMAIN uses a template parameter in a
19509 deducible way; that is, if it has a max value of <PARM> - 1. */
19512 deducible_array_bound (tree domain
)
19514 if (domain
== NULL_TREE
)
19517 tree max
= TYPE_MAX_VALUE (domain
);
19518 if (TREE_CODE (max
) != MINUS_EXPR
)
19521 return deducible_expression (TREE_OPERAND (max
, 0));
19524 /* Returns true iff the template arguments ARGS use a template parameter
19525 in a deducible way. */
19528 deducible_template_args (tree args
)
19530 for (int i
= 0; i
< TREE_VEC_LENGTH (args
); ++i
)
19533 tree elt
= TREE_VEC_ELT (args
, i
);
19534 if (ARGUMENT_PACK_P (elt
))
19535 deducible
= deducible_template_args (ARGUMENT_PACK_ARGS (elt
));
19538 if (PACK_EXPANSION_P (elt
))
19539 elt
= PACK_EXPANSION_PATTERN (elt
);
19540 if (TREE_CODE (elt
) == TEMPLATE_TEMPLATE_PARM
)
19542 else if (TYPE_P (elt
))
19543 deducible
= uses_deducible_template_parms (elt
);
19545 deducible
= deducible_expression (elt
);
19553 /* Returns true iff TYPE contains any deducible references to template
19554 parameters, as per 14.8.2.5. */
19557 uses_deducible_template_parms (tree type
)
19559 if (PACK_EXPANSION_P (type
))
19560 type
= PACK_EXPANSION_PATTERN (type
);
19567 if (TREE_CODE (type
) == TEMPLATE_TYPE_PARM
19568 || TREE_CODE (type
) == BOUND_TEMPLATE_TEMPLATE_PARM
)
19574 if (POINTER_TYPE_P (type
))
19575 return uses_deducible_template_parms (TREE_TYPE (type
));
19577 /* T[integer-constant ]
19579 if (TREE_CODE (type
) == ARRAY_TYPE
)
19580 return (uses_deducible_template_parms (TREE_TYPE (type
))
19581 || deducible_array_bound (TYPE_DOMAIN (type
)));
19593 if (TYPE_PTRMEM_P (type
))
19594 return (uses_deducible_template_parms (TYPE_PTRMEM_CLASS_TYPE (type
))
19595 || (uses_deducible_template_parms
19596 (TYPE_PTRMEM_POINTED_TO_TYPE (type
))));
19598 /* template-name <T> (where template-name refers to a class template)
19599 template-name <i> (where template-name refers to a class template) */
19600 if (CLASS_TYPE_P (type
)
19601 && CLASSTYPE_TEMPLATE_INFO (type
)
19602 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (type
)))
19603 return deducible_template_args (INNERMOST_TEMPLATE_ARGS
19604 (CLASSTYPE_TI_ARGS (type
)));
19609 if (TREE_CODE (type
) == FUNCTION_TYPE
19610 || TREE_CODE (type
) == METHOD_TYPE
)
19612 if (uses_deducible_template_parms (TREE_TYPE (type
)))
19614 tree parm
= TYPE_ARG_TYPES (type
);
19615 if (TREE_CODE (type
) == METHOD_TYPE
)
19616 parm
= TREE_CHAIN (parm
);
19617 for (; parm
; parm
= TREE_CHAIN (parm
))
19618 if (uses_deducible_template_parms (TREE_VALUE (parm
)))
19625 /* Subroutine of type_unification_real and unify_pack_expansion to
19626 handle unification of a single P/A pair. Parameters are as
19627 for those functions. */
19630 unify_one_argument (tree tparms
, tree targs
, tree parm
, tree arg
,
19631 int subr
, unification_kind_t strict
,
19634 tree arg_expr
= NULL_TREE
;
19637 if (arg
== error_mark_node
|| parm
== error_mark_node
)
19638 return unify_invalid (explain_p
);
19639 if (arg
== unknown_type_node
)
19640 /* We can't deduce anything from this, but we might get all the
19641 template args from other function args. */
19642 return unify_success (explain_p
);
19644 /* Implicit conversions (Clause 4) will be performed on a function
19645 argument to convert it to the type of the corresponding function
19646 parameter if the parameter type contains no template-parameters that
19647 participate in template argument deduction. */
19648 if (strict
!= DEDUCE_EXACT
19649 && TYPE_P (parm
) && !uses_deducible_template_parms (parm
))
19650 /* For function parameters with no deducible template parameters,
19651 just return. We'll check non-dependent conversions later. */
19652 return unify_success (explain_p
);
19657 arg_strict
= (UNIFY_ALLOW_OUTER_LEVEL
19658 | UNIFY_ALLOW_MORE_CV_QUAL
19659 | UNIFY_ALLOW_DERIVED
);
19663 arg_strict
= UNIFY_ALLOW_LESS_CV_QUAL
;
19667 arg_strict
= UNIFY_ALLOW_NONE
;
19671 gcc_unreachable ();
19674 /* We only do these transformations if this is the top-level
19675 parameter_type_list in a call or declaration matching; in other
19676 situations (nested function declarators, template argument lists) we
19677 won't be comparing a type to an expression, and we don't do any type
19683 gcc_assert (TREE_TYPE (arg
) != NULL_TREE
);
19684 if (type_unknown_p (arg
))
19686 /* [temp.deduct.type] A template-argument can be
19687 deduced from a pointer to function or pointer
19688 to member function argument if the set of
19689 overloaded functions does not contain function
19690 templates and at most one of a set of
19691 overloaded functions provides a unique
19693 resolve_overloaded_unification (tparms
, targs
, parm
,
19695 arg_strict
, explain_p
);
19696 /* If a unique match was not found, this is a
19697 non-deduced context, so we still succeed. */
19698 return unify_success (explain_p
);
19702 arg
= unlowered_expr_type (arg
);
19703 if (arg
== error_mark_node
)
19704 return unify_invalid (explain_p
);
19708 maybe_adjust_types_for_deduction (strict
, &parm
, &arg
, arg_expr
);
19711 if ((TYPE_P (parm
) || TREE_CODE (parm
) == TEMPLATE_DECL
)
19712 != (TYPE_P (arg
) || TREE_CODE (arg
) == TEMPLATE_DECL
))
19713 return unify_template_argument_mismatch (explain_p
, parm
, arg
);
19715 /* For deduction from an init-list we need the actual list. */
19716 if (arg_expr
&& BRACE_ENCLOSED_INITIALIZER_P (arg_expr
))
19718 return unify (tparms
, targs
, parm
, arg
, arg_strict
, explain_p
);
19721 /* for_each_template_parm callback that always returns 0. */
19724 zero_r (tree
, void *)
19729 /* for_each_template_parm any_fn callback to handle deduction of a template
19730 type argument from the type of an array bound. */
19733 array_deduction_r (tree t
, void *data
)
19735 tree_pair_p d
= (tree_pair_p
)data
;
19736 tree
&tparms
= d
->purpose
;
19737 tree
&targs
= d
->value
;
19739 if (TREE_CODE (t
) == ARRAY_TYPE
)
19740 if (tree dom
= TYPE_DOMAIN (t
))
19741 if (tree max
= TYPE_MAX_VALUE (dom
))
19743 if (TREE_CODE (max
) == MINUS_EXPR
)
19744 max
= TREE_OPERAND (max
, 0);
19745 if (TREE_CODE (max
) == TEMPLATE_PARM_INDEX
)
19746 unify (tparms
, targs
, TREE_TYPE (max
), size_type_node
,
19747 UNIFY_ALLOW_NONE
, /*explain*/false);
19750 /* Keep walking. */
19754 /* Try to deduce any not-yet-deduced template type arguments from the type of
19755 an array bound. This is handled separately from unify because 14.8.2.5 says
19756 "The type of a type parameter is only deduced from an array bound if it is
19757 not otherwise deduced." */
19760 try_array_deduction (tree tparms
, tree targs
, tree parm
)
19762 tree_pair_s data
= { tparms
, targs
};
19763 hash_set
<tree
> visited
;
19764 for_each_template_parm (parm
, zero_r
, &data
, &visited
,
19765 /*nondeduced*/false, array_deduction_r
);
19768 /* Most parms like fn_type_unification.
19770 If SUBR is 1, we're being called recursively (to unify the
19771 arguments of a function or method parameter of a function
19774 CHECKS is a pointer to a vector of access checks encountered while
19775 substituting default template arguments. */
19778 type_unification_real (tree tparms
,
19782 unsigned int xnargs
,
19784 unification_kind_t strict
,
19786 vec
<deferred_access_check
, va_gc
> **checks
,
19791 int ntparms
= TREE_VEC_LENGTH (tparms
);
19792 int saw_undeduced
= 0;
19795 unsigned int nargs
;
19798 gcc_assert (TREE_CODE (tparms
) == TREE_VEC
);
19799 gcc_assert (xparms
== NULL_TREE
|| TREE_CODE (xparms
) == TREE_LIST
);
19800 gcc_assert (ntparms
> 0);
19802 tree targs
= INNERMOST_TEMPLATE_ARGS (full_targs
);
19804 /* Reset the number of non-defaulted template arguments contained
19806 NON_DEFAULT_TEMPLATE_ARGS_COUNT (targs
) = NULL_TREE
;
19814 while (parms
&& parms
!= void_list_node
19817 parm
= TREE_VALUE (parms
);
19819 if (TREE_CODE (parm
) == TYPE_PACK_EXPANSION
19820 && (!TREE_CHAIN (parms
) || TREE_CHAIN (parms
) == void_list_node
))
19821 /* For a function parameter pack that occurs at the end of the
19822 parameter-declaration-list, the type A of each remaining
19823 argument of the call is compared with the type P of the
19824 declarator-id of the function parameter pack. */
19827 parms
= TREE_CHAIN (parms
);
19829 if (TREE_CODE (parm
) == TYPE_PACK_EXPANSION
)
19830 /* For a function parameter pack that does not occur at the
19831 end of the parameter-declaration-list, the type of the
19832 parameter pack is a non-deduced context. */
19838 if (unify_one_argument (tparms
, full_targs
, parm
, arg
, subr
, strict
,
19844 && parms
!= void_list_node
19845 && TREE_CODE (TREE_VALUE (parms
)) == TYPE_PACK_EXPANSION
)
19847 /* Unify the remaining arguments with the pack expansion type. */
19849 tree parmvec
= make_tree_vec (1);
19851 /* Allocate a TREE_VEC and copy in all of the arguments */
19852 argvec
= make_tree_vec (nargs
- ia
);
19853 for (i
= 0; ia
< nargs
; ++ia
, ++i
)
19854 TREE_VEC_ELT (argvec
, i
) = args
[ia
];
19856 /* Copy the parameter into parmvec. */
19857 TREE_VEC_ELT (parmvec
, 0) = TREE_VALUE (parms
);
19858 if (unify_pack_expansion (tparms
, full_targs
, parmvec
, argvec
, strict
,
19859 /*subr=*/subr
, explain_p
))
19862 /* Advance to the end of the list of parameters. */
19863 parms
= TREE_CHAIN (parms
);
19866 /* Fail if we've reached the end of the parm list, and more args
19867 are present, and the parm list isn't variadic. */
19868 if (ia
< nargs
&& parms
== void_list_node
)
19869 return unify_too_many_arguments (explain_p
, nargs
, ia
);
19870 /* Fail if parms are left and they don't have default values and
19871 they aren't all deduced as empty packs (c++/57397). This is
19872 consistent with sufficient_parms_p. */
19873 if (parms
&& parms
!= void_list_node
19874 && TREE_PURPOSE (parms
) == NULL_TREE
)
19876 unsigned int count
= nargs
;
19881 type_pack_p
= TREE_CODE (TREE_VALUE (p
)) == TYPE_PACK_EXPANSION
;
19884 p
= TREE_CHAIN (p
);
19886 while (p
&& p
!= void_list_node
);
19887 if (count
!= nargs
)
19888 return unify_too_few_arguments (explain_p
, ia
, count
,
19894 tsubst_flags_t complain
= (explain_p
19895 ? tf_warning_or_error
19897 bool tried_array_deduction
= (cxx_dialect
< cxx17
);
19899 for (i
= 0; i
< ntparms
; i
++)
19901 tree targ
= TREE_VEC_ELT (targs
, i
);
19902 tree tparm
= TREE_VEC_ELT (tparms
, i
);
19904 /* Clear the "incomplete" flags on all argument packs now so that
19905 substituting them into later default arguments works. */
19906 if (targ
&& ARGUMENT_PACK_P (targ
))
19908 ARGUMENT_PACK_INCOMPLETE_P (targ
) = 0;
19909 ARGUMENT_PACK_EXPLICIT_ARGS (targ
) = NULL_TREE
;
19912 if (targ
|| tparm
== error_mark_node
)
19914 tparm
= TREE_VALUE (tparm
);
19916 if (TREE_CODE (tparm
) == TYPE_DECL
19917 && !tried_array_deduction
)
19919 try_array_deduction (tparms
, targs
, xparms
);
19920 tried_array_deduction
= true;
19921 if (TREE_VEC_ELT (targs
, i
))
19925 /* If this is an undeduced nontype parameter that depends on
19926 a type parameter, try another pass; its type may have been
19927 deduced from a later argument than the one from which
19928 this parameter can be deduced. */
19929 if (TREE_CODE (tparm
) == PARM_DECL
19930 && uses_template_parms (TREE_TYPE (tparm
))
19931 && saw_undeduced
< 2)
19937 /* Core issue #226 (C++0x) [temp.deduct]:
19939 If a template argument has not been deduced, its
19940 default template argument, if any, is used.
19942 When we are in C++98 mode, TREE_PURPOSE will either
19943 be NULL_TREE or ERROR_MARK_NODE, so we do not need
19944 to explicitly check cxx_dialect here. */
19945 if (TREE_PURPOSE (TREE_VEC_ELT (tparms
, i
)))
19946 /* OK, there is a default argument. Wait until after the
19947 conversion check to do substitution. */
19950 /* If the type parameter is a parameter pack, then it will
19951 be deduced to an empty parameter pack. */
19952 if (template_parameter_pack_p (tparm
))
19956 if (TREE_CODE (tparm
) == TEMPLATE_PARM_INDEX
)
19958 arg
= make_node (NONTYPE_ARGUMENT_PACK
);
19959 TREE_CONSTANT (arg
) = 1;
19962 arg
= cxx_make_type (TYPE_ARGUMENT_PACK
);
19964 SET_ARGUMENT_PACK_ARGS (arg
, make_tree_vec (0));
19966 TREE_VEC_ELT (targs
, i
) = arg
;
19970 return unify_parameter_deduction_failure (explain_p
, tparm
);
19973 /* DR 1391: All parameters have args, now check non-dependent parms for
19975 if (saw_undeduced
< 2)
19976 for (ia
= 0, parms
= xparms
, args
= xargs
, nargs
= xnargs
;
19977 parms
&& parms
!= void_list_node
&& ia
< nargs
; )
19979 parm
= TREE_VALUE (parms
);
19981 if (TREE_CODE (parm
) == TYPE_PACK_EXPANSION
19982 && (!TREE_CHAIN (parms
)
19983 || TREE_CHAIN (parms
) == void_list_node
))
19984 /* For a function parameter pack that occurs at the end of the
19985 parameter-declaration-list, the type A of each remaining
19986 argument of the call is compared with the type P of the
19987 declarator-id of the function parameter pack. */
19990 parms
= TREE_CHAIN (parms
);
19992 if (TREE_CODE (parm
) == TYPE_PACK_EXPANSION
)
19993 /* For a function parameter pack that does not occur at the
19994 end of the parameter-declaration-list, the type of the
19995 parameter pack is a non-deduced context. */
20001 if (uses_template_parms (parm
))
20003 if (check_non_deducible_conversion (parm
, arg
, strict
, flags
,
20008 /* Now substitute into the default template arguments. */
20009 for (i
= 0; i
< ntparms
; i
++)
20011 tree targ
= TREE_VEC_ELT (targs
, i
);
20012 tree tparm
= TREE_VEC_ELT (tparms
, i
);
20014 if (targ
|| tparm
== error_mark_node
)
20016 tree parm
= TREE_VALUE (tparm
);
20017 tree arg
= TREE_PURPOSE (tparm
);
20018 reopen_deferring_access_checks (*checks
);
20019 location_t save_loc
= input_location
;
20021 input_location
= DECL_SOURCE_LOCATION (parm
);
20022 if (saw_undeduced
== 1)
20023 ++processing_template_decl
;
20025 if (saw_undeduced
== 1
20026 && TREE_CODE (parm
) == PARM_DECL
20027 && uses_template_parms (TREE_TYPE (parm
)))
20029 /* The type of this non-type parameter depends on undeduced
20030 parameters. Don't try to use its default argument yet,
20031 but do check whether the arguments we already have cause
20032 substitution failure, so that that happens before we try
20033 later default arguments (78489). */
20034 tree type
= tsubst (TREE_TYPE (parm
), full_targs
, complain
,
20036 if (type
== error_mark_node
)
20037 arg
= error_mark_node
;
20043 arg
= tsubst_template_arg (arg
, full_targs
, complain
, NULL_TREE
);
20045 if (!uses_template_parms (arg
))
20046 arg
= convert_template_argument (parm
, arg
, full_targs
,
20047 complain
, i
, NULL_TREE
);
20048 else if (saw_undeduced
== 1)
20051 arg
= error_mark_node
;
20054 if (saw_undeduced
== 1)
20055 --processing_template_decl
;
20056 input_location
= save_loc
;
20057 *checks
= get_deferred_access_checks ();
20058 pop_deferring_access_checks ();
20060 if (arg
== error_mark_node
)
20064 TREE_VEC_ELT (targs
, i
) = arg
;
20065 /* The position of the first default template argument,
20066 is also the number of non-defaulted arguments in TARGS.
20068 if (!NON_DEFAULT_TEMPLATE_ARGS_COUNT (targs
))
20069 SET_NON_DEFAULT_TEMPLATE_ARGS_COUNT (targs
, i
);
20073 if (saw_undeduced
++ == 1)
20077 if (CHECKING_P
&& !NON_DEFAULT_TEMPLATE_ARGS_COUNT (targs
))
20078 SET_NON_DEFAULT_TEMPLATE_ARGS_COUNT (targs
, TREE_VEC_LENGTH (targs
));
20080 return unify_success (explain_p
);
20083 /* Subroutine of type_unification_real. Args are like the variables
20084 at the call site. ARG is an overloaded function (or template-id);
20085 we try deducing template args from each of the overloads, and if
20086 only one succeeds, we go with that. Modifies TARGS and returns
20087 true on success. */
20090 resolve_overloaded_unification (tree tparms
,
20094 unification_kind_t strict
,
20098 tree tempargs
= copy_node (targs
);
20100 tree goodfn
= NULL_TREE
;
20103 if (TREE_CODE (arg
) == ADDR_EXPR
)
20105 arg
= TREE_OPERAND (arg
, 0);
20111 if (TREE_CODE (arg
) == COMPONENT_REF
)
20112 /* Handle `&x' where `x' is some static or non-static member
20114 arg
= TREE_OPERAND (arg
, 1);
20116 if (TREE_CODE (arg
) == OFFSET_REF
)
20117 arg
= TREE_OPERAND (arg
, 1);
20119 /* Strip baselink information. */
20120 if (BASELINK_P (arg
))
20121 arg
= BASELINK_FUNCTIONS (arg
);
20123 if (TREE_CODE (arg
) == TEMPLATE_ID_EXPR
)
20125 /* If we got some explicit template args, we need to plug them into
20126 the affected templates before we try to unify, in case the
20127 explicit args will completely resolve the templates in question. */
20130 tree expl_subargs
= TREE_OPERAND (arg
, 1);
20131 arg
= TREE_OPERAND (arg
, 0);
20133 for (lkp_iterator
iter (arg
); iter
; ++iter
)
20136 tree subargs
, elem
;
20138 if (TREE_CODE (fn
) != TEMPLATE_DECL
)
20141 subargs
= coerce_template_parms (DECL_INNERMOST_TEMPLATE_PARMS (fn
),
20142 expl_subargs
, NULL_TREE
, tf_none
,
20143 /*require_all_args=*/true,
20144 /*use_default_args=*/true);
20145 if (subargs
!= error_mark_node
20146 && !any_dependent_template_arguments_p (subargs
))
20148 elem
= TREE_TYPE (instantiate_template (fn
, subargs
, tf_none
));
20149 if (try_one_overload (tparms
, targs
, tempargs
, parm
,
20150 elem
, strict
, sub_strict
, addr_p
, explain_p
)
20151 && (!goodfn
|| !same_type_p (goodfn
, elem
)))
20160 /* If no templates (or more than one) are fully resolved by the
20161 explicit arguments, this template-id is a non-deduced context; it
20162 could still be OK if we deduce all template arguments for the
20163 enclosing call through other arguments. */
20167 else if (TREE_CODE (arg
) != OVERLOAD
20168 && TREE_CODE (arg
) != FUNCTION_DECL
)
20169 /* If ARG is, for example, "(0, &f)" then its type will be unknown
20170 -- but the deduction does not succeed because the expression is
20171 not just the function on its own. */
20174 for (lkp_iterator
iter (arg
); iter
; ++iter
)
20177 if (try_one_overload (tparms
, targs
, tempargs
, parm
, TREE_TYPE (fn
),
20178 strict
, sub_strict
, addr_p
, explain_p
)
20179 && (!goodfn
|| !decls_match (goodfn
, fn
)))
20186 /* [temp.deduct.type] A template-argument can be deduced from a pointer
20187 to function or pointer to member function argument if the set of
20188 overloaded functions does not contain function templates and at most
20189 one of a set of overloaded functions provides a unique match.
20191 So if we found multiple possibilities, we return success but don't
20192 deduce anything. */
20196 int i
= TREE_VEC_LENGTH (targs
);
20198 if (TREE_VEC_ELT (tempargs
, i
))
20200 tree old
= TREE_VEC_ELT (targs
, i
);
20201 tree new_
= TREE_VEC_ELT (tempargs
, i
);
20202 if (new_
&& old
&& ARGUMENT_PACK_P (old
)
20203 && ARGUMENT_PACK_EXPLICIT_ARGS (old
))
20204 /* Don't forget explicit template arguments in a pack. */
20205 ARGUMENT_PACK_EXPLICIT_ARGS (new_
)
20206 = ARGUMENT_PACK_EXPLICIT_ARGS (old
);
20207 TREE_VEC_ELT (targs
, i
) = new_
;
20216 /* Core DR 115: In contexts where deduction is done and fails, or in
20217 contexts where deduction is not done, if a template argument list is
20218 specified and it, along with any default template arguments, identifies
20219 a single function template specialization, then the template-id is an
20220 lvalue for the function template specialization. */
20223 resolve_nondeduced_context (tree orig_expr
, tsubst_flags_t complain
)
20225 tree expr
, offset
, baselink
;
20228 if (!type_unknown_p (orig_expr
))
20233 offset
= NULL_TREE
;
20234 baselink
= NULL_TREE
;
20236 if (TREE_CODE (expr
) == ADDR_EXPR
)
20238 expr
= TREE_OPERAND (expr
, 0);
20241 if (TREE_CODE (expr
) == OFFSET_REF
)
20244 expr
= TREE_OPERAND (expr
, 1);
20246 if (BASELINK_P (expr
))
20249 expr
= BASELINK_FUNCTIONS (expr
);
20252 if (TREE_CODE (expr
) == TEMPLATE_ID_EXPR
)
20255 tree goodfn
= NULL_TREE
;
20257 /* If we got some explicit template args, we need to plug them into
20258 the affected templates before we try to unify, in case the
20259 explicit args will completely resolve the templates in question. */
20261 tree expl_subargs
= TREE_OPERAND (expr
, 1);
20262 tree arg
= TREE_OPERAND (expr
, 0);
20263 tree badfn
= NULL_TREE
;
20264 tree badargs
= NULL_TREE
;
20266 for (lkp_iterator
iter (arg
); iter
; ++iter
)
20269 tree subargs
, elem
;
20271 if (TREE_CODE (fn
) != TEMPLATE_DECL
)
20274 subargs
= coerce_template_parms (DECL_INNERMOST_TEMPLATE_PARMS (fn
),
20275 expl_subargs
, NULL_TREE
, tf_none
,
20276 /*require_all_args=*/true,
20277 /*use_default_args=*/true);
20278 if (subargs
!= error_mark_node
20279 && !any_dependent_template_arguments_p (subargs
))
20281 elem
= instantiate_template (fn
, subargs
, tf_none
);
20282 if (elem
== error_mark_node
)
20287 else if (elem
&& (!goodfn
|| !decls_match (goodfn
, elem
)))
20296 mark_used (goodfn
);
20299 expr
= build_baselink (BASELINK_BINFO (baselink
),
20300 BASELINK_ACCESS_BINFO (baselink
),
20301 expr
, BASELINK_OPTYPE (baselink
));
20305 = TYPE_MAIN_VARIANT (TREE_TYPE (TREE_OPERAND (offset
, 0)));
20306 expr
= build_offset_ref (base
, expr
, addr
, complain
);
20309 expr
= cp_build_addr_expr (expr
, complain
);
20312 else if (good
== 0 && badargs
&& (complain
& tf_error
))
20313 /* There were no good options and at least one bad one, so let the
20314 user know what the problem is. */
20315 instantiate_template (badfn
, badargs
, complain
);
20320 /* Subroutine of resolve_overloaded_unification; does deduction for a single
20321 overload. Fills TARGS with any deduced arguments, or error_mark_node if
20322 different overloads deduce different arguments for a given parm.
20323 ADDR_P is true if the expression for which deduction is being
20324 performed was of the form "& fn" rather than simply "fn".
20326 Returns 1 on success. */
20329 try_one_overload (tree tparms
,
20334 unification_kind_t strict
,
20343 if (arg
== error_mark_node
)
20346 /* [temp.deduct.type] A template-argument can be deduced from a pointer
20347 to function or pointer to member function argument if the set of
20348 overloaded functions does not contain function templates and at most
20349 one of a set of overloaded functions provides a unique match.
20351 So if this is a template, just return success. */
20353 if (uses_template_parms (arg
))
20356 if (TREE_CODE (arg
) == METHOD_TYPE
)
20357 arg
= build_ptrmemfunc_type (build_pointer_type (arg
));
20359 arg
= build_pointer_type (arg
);
20361 sub_strict
|= maybe_adjust_types_for_deduction (strict
, &parm
, &arg
, NULL
);
20363 /* We don't copy orig_targs for this because if we have already deduced
20364 some template args from previous args, unify would complain when we
20365 try to deduce a template parameter for the same argument, even though
20366 there isn't really a conflict. */
20367 nargs
= TREE_VEC_LENGTH (targs
);
20368 tempargs
= make_tree_vec (nargs
);
20370 if (unify (tparms
, tempargs
, parm
, arg
, sub_strict
, explain_p
))
20373 /* First make sure we didn't deduce anything that conflicts with
20374 explicitly specified args. */
20375 for (i
= nargs
; i
--; )
20377 tree elt
= TREE_VEC_ELT (tempargs
, i
);
20378 tree oldelt
= TREE_VEC_ELT (orig_targs
, i
);
20382 else if (uses_template_parms (elt
))
20383 /* Since we're unifying against ourselves, we will fill in
20384 template args used in the function parm list with our own
20385 template parms. Discard them. */
20386 TREE_VEC_ELT (tempargs
, i
) = NULL_TREE
;
20387 else if (oldelt
&& ARGUMENT_PACK_P (oldelt
))
20389 /* Check that the argument at each index of the deduced argument pack
20390 is equivalent to the corresponding explicitly specified argument.
20391 We may have deduced more arguments than were explicitly specified,
20394 /* We used to assert ARGUMENT_PACK_INCOMPLETE_P (oldelt) here, but
20395 that's wrong if we deduce the same argument pack from multiple
20396 function arguments: it's only incomplete the first time. */
20398 tree explicit_pack
= ARGUMENT_PACK_ARGS (oldelt
);
20399 tree deduced_pack
= ARGUMENT_PACK_ARGS (elt
);
20401 if (TREE_VEC_LENGTH (deduced_pack
)
20402 < TREE_VEC_LENGTH (explicit_pack
))
20405 for (int j
= 0; j
< TREE_VEC_LENGTH (explicit_pack
); j
++)
20406 if (!template_args_equal (TREE_VEC_ELT (explicit_pack
, j
),
20407 TREE_VEC_ELT (deduced_pack
, j
)))
20410 else if (oldelt
&& !template_args_equal (oldelt
, elt
))
20414 for (i
= nargs
; i
--; )
20416 tree elt
= TREE_VEC_ELT (tempargs
, i
);
20419 TREE_VEC_ELT (targs
, i
) = elt
;
20425 /* PARM is a template class (perhaps with unbound template
20426 parameters). ARG is a fully instantiated type. If ARG can be
20427 bound to PARM, return ARG, otherwise return NULL_TREE. TPARMS and
20428 TARGS are as for unify. */
20431 try_class_unification (tree tparms
, tree targs
, tree parm
, tree arg
,
20434 tree copy_of_targs
;
20436 if (!CLASSTYPE_SPECIALIZATION_OF_PRIMARY_TEMPLATE_P (arg
))
20438 else if (TREE_CODE (parm
) == BOUND_TEMPLATE_TEMPLATE_PARM
)
20439 /* Matches anything. */;
20440 else if (most_general_template (CLASSTYPE_TI_TEMPLATE (arg
))
20441 != most_general_template (CLASSTYPE_TI_TEMPLATE (parm
)))
20444 /* We need to make a new template argument vector for the call to
20445 unify. If we used TARGS, we'd clutter it up with the result of
20446 the attempted unification, even if this class didn't work out.
20447 We also don't want to commit ourselves to all the unifications
20448 we've already done, since unification is supposed to be done on
20449 an argument-by-argument basis. In other words, consider the
20450 following pathological case:
20452 template <int I, int J, int K>
20455 template <int I, int J>
20456 struct S<I, J, 2> : public S<I, I, I>, S<J, J, J> {};
20458 template <int I, int J, int K>
20459 void f(S<I, J, K>, S<I, I, I>);
20468 Now, by the time we consider the unification involving `s2', we
20469 already know that we must have `f<0, 0, 0>'. But, even though
20470 `S<0, 1, 2>' is derived from `S<0, 0, 0>', the code is invalid
20471 because there are two ways to unify base classes of S<0, 1, 2>
20472 with S<I, I, I>. If we kept the already deduced knowledge, we
20473 would reject the possibility I=1. */
20474 copy_of_targs
= make_tree_vec (TREE_VEC_LENGTH (targs
));
20476 if (TREE_CODE (parm
) == BOUND_TEMPLATE_TEMPLATE_PARM
)
20478 if (unify_bound_ttp_args (tparms
, copy_of_targs
, parm
, arg
, explain_p
))
20483 /* If unification failed, we're done. */
20484 if (unify (tparms
, copy_of_targs
, CLASSTYPE_TI_ARGS (parm
),
20485 CLASSTYPE_TI_ARGS (arg
), UNIFY_ALLOW_NONE
, explain_p
))
20491 /* Given a template type PARM and a class type ARG, find the unique
20492 base type in ARG that is an instance of PARM. We do not examine
20493 ARG itself; only its base-classes. If there is not exactly one
20494 appropriate base class, return NULL_TREE. PARM may be the type of
20495 a partial specialization, as well as a plain template type. Used
20498 static enum template_base_result
20499 get_template_base (tree tparms
, tree targs
, tree parm
, tree arg
,
20500 bool explain_p
, tree
*result
)
20502 tree rval
= NULL_TREE
;
20505 gcc_assert (RECORD_OR_UNION_CODE_P (TREE_CODE (arg
)));
20507 binfo
= TYPE_BINFO (complete_type (arg
));
20510 /* The type could not be completed. */
20511 *result
= NULL_TREE
;
20512 return tbr_incomplete_type
;
20515 /* Walk in inheritance graph order. The search order is not
20516 important, and this avoids multiple walks of virtual bases. */
20517 for (binfo
= TREE_CHAIN (binfo
); binfo
; binfo
= TREE_CHAIN (binfo
))
20519 tree r
= try_class_unification (tparms
, targs
, parm
,
20520 BINFO_TYPE (binfo
), explain_p
);
20524 /* If there is more than one satisfactory baseclass, then:
20528 If they yield more than one possible deduced A, the type
20532 if (rval
&& !same_type_p (r
, rval
))
20534 *result
= NULL_TREE
;
20535 return tbr_ambiguous_baseclass
;
20543 return tbr_success
;
20546 /* Returns the level of DECL, which declares a template parameter. */
20549 template_decl_level (tree decl
)
20551 switch (TREE_CODE (decl
))
20554 case TEMPLATE_DECL
:
20555 return TEMPLATE_TYPE_LEVEL (TREE_TYPE (decl
));
20558 return TEMPLATE_PARM_LEVEL (DECL_INITIAL (decl
));
20561 gcc_unreachable ();
20566 /* Decide whether ARG can be unified with PARM, considering only the
20567 cv-qualifiers of each type, given STRICT as documented for unify.
20568 Returns nonzero iff the unification is OK on that basis. */
20571 check_cv_quals_for_unify (int strict
, tree arg
, tree parm
)
20573 int arg_quals
= cp_type_quals (arg
);
20574 int parm_quals
= cp_type_quals (parm
);
20576 if (TREE_CODE (parm
) == TEMPLATE_TYPE_PARM
20577 && !(strict
& UNIFY_ALLOW_OUTER_MORE_CV_QUAL
))
20579 /* Although a CVR qualifier is ignored when being applied to a
20580 substituted template parameter ([8.3.2]/1 for example), that
20581 does not allow us to unify "const T" with "int&" because both
20582 types are not of the form "cv-list T" [14.8.2.5 temp.deduct.type].
20583 It is ok when we're allowing additional CV qualifiers
20584 at the outer level [14.8.2.1]/3,1st bullet. */
20585 if ((TREE_CODE (arg
) == REFERENCE_TYPE
20586 || TREE_CODE (arg
) == FUNCTION_TYPE
20587 || TREE_CODE (arg
) == METHOD_TYPE
)
20588 && (parm_quals
& (TYPE_QUAL_CONST
| TYPE_QUAL_VOLATILE
)))
20591 if ((!POINTER_TYPE_P (arg
) && TREE_CODE (arg
) != TEMPLATE_TYPE_PARM
)
20592 && (parm_quals
& TYPE_QUAL_RESTRICT
))
20596 if (!(strict
& (UNIFY_ALLOW_MORE_CV_QUAL
| UNIFY_ALLOW_OUTER_MORE_CV_QUAL
))
20597 && (arg_quals
& parm_quals
) != parm_quals
)
20600 if (!(strict
& (UNIFY_ALLOW_LESS_CV_QUAL
| UNIFY_ALLOW_OUTER_LESS_CV_QUAL
))
20601 && (parm_quals
& arg_quals
) != arg_quals
)
20607 /* Determines the LEVEL and INDEX for the template parameter PARM. */
20609 template_parm_level_and_index (tree parm
, int* level
, int* index
)
20611 if (TREE_CODE (parm
) == TEMPLATE_TYPE_PARM
20612 || TREE_CODE (parm
) == TEMPLATE_TEMPLATE_PARM
20613 || TREE_CODE (parm
) == BOUND_TEMPLATE_TEMPLATE_PARM
)
20615 *index
= TEMPLATE_TYPE_IDX (parm
);
20616 *level
= TEMPLATE_TYPE_LEVEL (parm
);
20620 *index
= TEMPLATE_PARM_IDX (parm
);
20621 *level
= TEMPLATE_PARM_LEVEL (parm
);
20625 #define RECUR_AND_CHECK_FAILURE(TP, TA, P, A, S, EP) \
20627 if (unify (TP, TA, P, A, S, EP)) \
20631 /* Unifies the remaining arguments in PACKED_ARGS with the pack
20632 expansion at the end of PACKED_PARMS. Returns 0 if the type
20633 deduction succeeds, 1 otherwise. STRICT is the same as in
20634 fn_type_unification. CALL_ARGS_P is true iff PACKED_ARGS is actually a
20635 function call argument list. We'll need to adjust the arguments to make them
20636 types. SUBR tells us if this is from a recursive call to
20637 type_unification_real, or for comparing two template argument
20641 unify_pack_expansion (tree tparms
, tree targs
, tree packed_parms
,
20642 tree packed_args
, unification_kind_t strict
,
20643 bool subr
, bool explain_p
)
20646 = TREE_VEC_ELT (packed_parms
, TREE_VEC_LENGTH (packed_parms
) - 1);
20647 tree pattern
= PACK_EXPANSION_PATTERN (parm
);
20648 tree pack
, packs
= NULL_TREE
;
20649 int i
, start
= TREE_VEC_LENGTH (packed_parms
) - 1;
20651 /* Add in any args remembered from an earlier partial instantiation. */
20652 targs
= add_to_template_args (PACK_EXPANSION_EXTRA_ARGS (parm
), targs
);
20653 int levels
= TMPL_ARGS_DEPTH (targs
);
20655 packed_args
= expand_template_argument_pack (packed_args
);
20657 int len
= TREE_VEC_LENGTH (packed_args
);
20659 /* Determine the parameter packs we will be deducing from the
20660 pattern, and record their current deductions. */
20661 for (pack
= PACK_EXPANSION_PARAMETER_PACKS (parm
);
20662 pack
; pack
= TREE_CHAIN (pack
))
20664 tree parm_pack
= TREE_VALUE (pack
);
20667 /* Only template parameter packs can be deduced, not e.g. function
20668 parameter packs or __bases or __integer_pack. */
20669 if (!TEMPLATE_PARM_P (parm_pack
))
20672 /* Determine the index and level of this parameter pack. */
20673 template_parm_level_and_index (parm_pack
, &level
, &idx
);
20674 if (level
< levels
)
20677 /* Keep track of the parameter packs and their corresponding
20679 packs
= tree_cons (parm_pack
, TMPL_ARG (targs
, level
, idx
), packs
);
20680 TREE_TYPE (packs
) = make_tree_vec (len
- start
);
20683 /* Loop through all of the arguments that have not yet been
20684 unified and unify each with the pattern. */
20685 for (i
= start
; i
< len
; i
++)
20688 bool any_explicit
= false;
20689 tree arg
= TREE_VEC_ELT (packed_args
, i
);
20691 /* For each parameter pack, set its TMPL_ARG to either NULL_TREE
20692 or the element of its argument pack at the current index if
20693 this argument was explicitly specified. */
20694 for (pack
= packs
; pack
; pack
= TREE_CHAIN (pack
))
20698 template_parm_level_and_index (TREE_PURPOSE (pack
), &level
, &idx
);
20701 if (TREE_VALUE (pack
)
20702 && (pargs
= ARGUMENT_PACK_EXPLICIT_ARGS (TREE_VALUE (pack
)))
20703 && (i
- start
< TREE_VEC_LENGTH (pargs
)))
20705 any_explicit
= true;
20706 arg
= TREE_VEC_ELT (pargs
, i
- start
);
20708 TMPL_ARG (targs
, level
, idx
) = arg
;
20711 /* If we had explicit template arguments, substitute them into the
20712 pattern before deduction. */
20715 /* Some arguments might still be unspecified or dependent. */
20717 ++processing_template_decl
;
20718 dependent
= any_dependent_template_arguments_p (targs
);
20720 --processing_template_decl
;
20721 parm
= tsubst (pattern
, targs
,
20722 explain_p
? tf_warning_or_error
: tf_none
,
20725 --processing_template_decl
;
20726 if (parm
== error_mark_node
)
20732 /* Unify the pattern with the current argument. */
20733 if (unify_one_argument (tparms
, targs
, parm
, arg
, subr
, strict
,
20737 /* For each parameter pack, collect the deduced value. */
20738 for (pack
= packs
; pack
; pack
= TREE_CHAIN (pack
))
20741 template_parm_level_and_index (TREE_PURPOSE (pack
), &level
, &idx
);
20743 TREE_VEC_ELT (TREE_TYPE (pack
), i
- start
) =
20744 TMPL_ARG (targs
, level
, idx
);
20748 /* Verify that the results of unification with the parameter packs
20749 produce results consistent with what we've seen before, and make
20750 the deduced argument packs available. */
20751 for (pack
= packs
; pack
; pack
= TREE_CHAIN (pack
))
20753 tree old_pack
= TREE_VALUE (pack
);
20754 tree new_args
= TREE_TYPE (pack
);
20755 int i
, len
= TREE_VEC_LENGTH (new_args
);
20757 bool nondeduced_p
= false;
20759 /* By default keep the original deduced argument pack.
20760 If necessary, more specific code is going to update the
20761 resulting deduced argument later down in this function. */
20762 template_parm_level_and_index (TREE_PURPOSE (pack
), &level
, &idx
);
20763 TMPL_ARG (targs
, level
, idx
) = old_pack
;
20765 /* If NEW_ARGS contains any NULL_TREE entries, we didn't
20766 actually deduce anything. */
20767 for (i
= 0; i
< len
&& !nondeduced_p
; ++i
)
20768 if (TREE_VEC_ELT (new_args
, i
) == NULL_TREE
)
20769 nondeduced_p
= true;
20773 if (old_pack
&& ARGUMENT_PACK_INCOMPLETE_P (old_pack
))
20775 /* If we had fewer function args than explicit template args,
20776 just use the explicits. */
20777 tree explicit_args
= ARGUMENT_PACK_EXPLICIT_ARGS (old_pack
);
20778 int explicit_len
= TREE_VEC_LENGTH (explicit_args
);
20779 if (len
< explicit_len
)
20780 new_args
= explicit_args
;
20786 /* Build the deduced *_ARGUMENT_PACK. */
20787 if (TREE_CODE (TREE_PURPOSE (pack
)) == TEMPLATE_PARM_INDEX
)
20789 result
= make_node (NONTYPE_ARGUMENT_PACK
);
20790 TREE_CONSTANT (result
) = 1;
20793 result
= cxx_make_type (TYPE_ARGUMENT_PACK
);
20795 SET_ARGUMENT_PACK_ARGS (result
, new_args
);
20797 /* Note the deduced argument packs for this parameter
20799 TMPL_ARG (targs
, level
, idx
) = result
;
20801 else if (ARGUMENT_PACK_INCOMPLETE_P (old_pack
)
20802 && (ARGUMENT_PACK_ARGS (old_pack
)
20803 == ARGUMENT_PACK_EXPLICIT_ARGS (old_pack
)))
20805 /* We only had the explicitly-provided arguments before, but
20806 now we have a complete set of arguments. */
20807 tree explicit_args
= ARGUMENT_PACK_EXPLICIT_ARGS (old_pack
);
20809 SET_ARGUMENT_PACK_ARGS (old_pack
, new_args
);
20810 ARGUMENT_PACK_INCOMPLETE_P (old_pack
) = 1;
20811 ARGUMENT_PACK_EXPLICIT_ARGS (old_pack
) = explicit_args
;
20815 tree bad_old_arg
= NULL_TREE
, bad_new_arg
= NULL_TREE
;
20816 tree old_args
= ARGUMENT_PACK_ARGS (old_pack
);
20818 if (!comp_template_args (old_args
, new_args
,
20819 &bad_old_arg
, &bad_new_arg
))
20820 /* Inconsistent unification of this parameter pack. */
20821 return unify_parameter_pack_inconsistent (explain_p
,
20827 return unify_success (explain_p
);
20830 /* Handle unification of the domain of an array. PARM_DOM and ARG_DOM are
20831 INTEGER_TYPEs representing the TYPE_DOMAIN of ARRAY_TYPEs. The other
20832 parameters and return value are as for unify. */
20835 unify_array_domain (tree tparms
, tree targs
,
20836 tree parm_dom
, tree arg_dom
,
20844 /* Our representation of array types uses "N - 1" as the
20845 TYPE_MAX_VALUE for an array with "N" elements, if "N" is
20846 not an integer constant. We cannot unify arbitrarily
20847 complex expressions, so we eliminate the MINUS_EXPRs
20849 parm_max
= TYPE_MAX_VALUE (parm_dom
);
20850 parm_cst
= TREE_CODE (parm_max
) == INTEGER_CST
;
20853 gcc_assert (TREE_CODE (parm_max
) == MINUS_EXPR
);
20854 parm_max
= TREE_OPERAND (parm_max
, 0);
20856 arg_max
= TYPE_MAX_VALUE (arg_dom
);
20857 arg_cst
= TREE_CODE (arg_max
) == INTEGER_CST
;
20860 /* The ARG_MAX may not be a simple MINUS_EXPR, if we are
20861 trying to unify the type of a variable with the type
20862 of a template parameter. For example:
20864 template <unsigned int N>
20865 void f (char (&) [N]);
20872 Here, the type of the ARG will be "int [g(i)]", and
20873 may be a SAVE_EXPR, etc. */
20874 if (TREE_CODE (arg_max
) != MINUS_EXPR
)
20875 return unify_vla_arg (explain_p
, arg_dom
);
20876 arg_max
= TREE_OPERAND (arg_max
, 0);
20879 /* If only one of the bounds used a MINUS_EXPR, compensate
20880 by adding one to the other bound. */
20881 if (parm_cst
&& !arg_cst
)
20882 parm_max
= fold_build2_loc (input_location
, PLUS_EXPR
,
20886 else if (arg_cst
&& !parm_cst
)
20887 arg_max
= fold_build2_loc (input_location
, PLUS_EXPR
,
20892 return unify (tparms
, targs
, parm_max
, arg_max
,
20893 UNIFY_ALLOW_INTEGER
, explain_p
);
20896 /* Returns whether T, a P or A in unify, is a type, template or expression. */
20898 enum pa_kind_t
{ pa_type
, pa_tmpl
, pa_expr
};
20903 if (PACK_EXPANSION_P (t
))
20904 t
= PACK_EXPANSION_PATTERN (t
);
20905 if (TREE_CODE (t
) == TEMPLATE_TEMPLATE_PARM
20906 || TREE_CODE (t
) == UNBOUND_CLASS_TEMPLATE
20907 || DECL_TYPE_TEMPLATE_P (t
))
20909 else if (TYPE_P (t
))
20915 /* Deduce the value of template parameters. TPARMS is the (innermost)
20916 set of template parameters to a template. TARGS is the bindings
20917 for those template parameters, as determined thus far; TARGS may
20918 include template arguments for outer levels of template parameters
20919 as well. PARM is a parameter to a template function, or a
20920 subcomponent of that parameter; ARG is the corresponding argument.
20921 This function attempts to match PARM with ARG in a manner
20922 consistent with the existing assignments in TARGS. If more values
20923 are deduced, then TARGS is updated.
20925 Returns 0 if the type deduction succeeds, 1 otherwise. The
20926 parameter STRICT is a bitwise or of the following flags:
20929 Require an exact match between PARM and ARG.
20930 UNIFY_ALLOW_MORE_CV_QUAL:
20931 Allow the deduced ARG to be more cv-qualified (by qualification
20932 conversion) than ARG.
20933 UNIFY_ALLOW_LESS_CV_QUAL:
20934 Allow the deduced ARG to be less cv-qualified than ARG.
20935 UNIFY_ALLOW_DERIVED:
20936 Allow the deduced ARG to be a template base class of ARG,
20937 or a pointer to a template base class of the type pointed to by
20939 UNIFY_ALLOW_INTEGER:
20940 Allow any integral type to be deduced. See the TEMPLATE_PARM_INDEX
20941 case for more information.
20942 UNIFY_ALLOW_OUTER_LEVEL:
20943 This is the outermost level of a deduction. Used to determine validity
20944 of qualification conversions. A valid qualification conversion must
20945 have const qualified pointers leading up to the inner type which
20946 requires additional CV quals, except at the outer level, where const
20947 is not required [conv.qual]. It would be normal to set this flag in
20948 addition to setting UNIFY_ALLOW_MORE_CV_QUAL.
20949 UNIFY_ALLOW_OUTER_MORE_CV_QUAL:
20950 This is the outermost level of a deduction, and PARM can be more CV
20951 qualified at this point.
20952 UNIFY_ALLOW_OUTER_LESS_CV_QUAL:
20953 This is the outermost level of a deduction, and PARM can be less CV
20954 qualified at this point. */
20957 unify (tree tparms
, tree targs
, tree parm
, tree arg
, int strict
,
20963 int strict_in
= strict
;
20964 tsubst_flags_t complain
= (explain_p
20965 ? tf_warning_or_error
20968 /* I don't think this will do the right thing with respect to types.
20969 But the only case I've seen it in so far has been array bounds, where
20970 signedness is the only information lost, and I think that will be
20972 while (CONVERT_EXPR_P (parm
))
20973 parm
= TREE_OPERAND (parm
, 0);
20975 if (arg
== error_mark_node
)
20976 return unify_invalid (explain_p
);
20977 if (arg
== unknown_type_node
20978 || arg
== init_list_type_node
)
20979 /* We can't deduce anything from this, but we might get all the
20980 template args from other function args. */
20981 return unify_success (explain_p
);
20983 if (parm
== any_targ_node
|| arg
== any_targ_node
)
20984 return unify_success (explain_p
);
20986 /* If PARM uses template parameters, then we can't bail out here,
20987 even if ARG == PARM, since we won't record unifications for the
20988 template parameters. We might need them if we're trying to
20989 figure out which of two things is more specialized. */
20990 if (arg
== parm
&& !uses_template_parms (parm
))
20991 return unify_success (explain_p
);
20993 /* Handle init lists early, so the rest of the function can assume
20994 we're dealing with a type. */
20995 if (BRACE_ENCLOSED_INITIALIZER_P (arg
))
20999 tree orig_parm
= parm
;
21001 /* Replace T with std::initializer_list<T> for deduction. */
21002 if (TREE_CODE (parm
) == TEMPLATE_TYPE_PARM
21003 && flag_deduce_init_list
)
21004 parm
= listify (parm
);
21006 if (!is_std_init_list (parm
)
21007 && TREE_CODE (parm
) != ARRAY_TYPE
)
21008 /* We can only deduce from an initializer list argument if the
21009 parameter is std::initializer_list or an array; otherwise this
21010 is a non-deduced context. */
21011 return unify_success (explain_p
);
21013 if (TREE_CODE (parm
) == ARRAY_TYPE
)
21014 elttype
= TREE_TYPE (parm
);
21017 elttype
= TREE_VEC_ELT (CLASSTYPE_TI_ARGS (parm
), 0);
21018 /* Deduction is defined in terms of a single type, so just punt
21019 on the (bizarre) std::initializer_list<T...>. */
21020 if (PACK_EXPANSION_P (elttype
))
21021 return unify_success (explain_p
);
21024 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (arg
), i
, elt
)
21026 int elt_strict
= strict
;
21028 if (elt
== error_mark_node
)
21029 return unify_invalid (explain_p
);
21031 if (!BRACE_ENCLOSED_INITIALIZER_P (elt
))
21033 tree type
= TREE_TYPE (elt
);
21034 if (type
== error_mark_node
)
21035 return unify_invalid (explain_p
);
21036 /* It should only be possible to get here for a call. */
21037 gcc_assert (elt_strict
& UNIFY_ALLOW_OUTER_LEVEL
);
21038 elt_strict
|= maybe_adjust_types_for_deduction
21039 (DEDUCE_CALL
, &elttype
, &type
, elt
);
21043 RECUR_AND_CHECK_FAILURE (tparms
, targs
, elttype
, elt
, elt_strict
,
21047 if (TREE_CODE (parm
) == ARRAY_TYPE
21048 && deducible_array_bound (TYPE_DOMAIN (parm
)))
21050 /* Also deduce from the length of the initializer list. */
21051 tree max
= size_int (CONSTRUCTOR_NELTS (arg
));
21052 tree idx
= compute_array_index_type (NULL_TREE
, max
, tf_none
);
21053 if (idx
== error_mark_node
)
21054 return unify_invalid (explain_p
);
21055 return unify_array_domain (tparms
, targs
, TYPE_DOMAIN (parm
),
21059 /* If the std::initializer_list<T> deduction worked, replace the
21060 deduced A with std::initializer_list<A>. */
21061 if (orig_parm
!= parm
)
21063 idx
= TEMPLATE_TYPE_IDX (orig_parm
);
21064 targ
= TREE_VEC_ELT (INNERMOST_TEMPLATE_ARGS (targs
), idx
);
21065 targ
= listify (targ
);
21066 TREE_VEC_ELT (INNERMOST_TEMPLATE_ARGS (targs
), idx
) = targ
;
21068 return unify_success (explain_p
);
21071 /* If parm and arg aren't the same kind of thing (template, type, or
21072 expression), fail early. */
21073 if (pa_kind (parm
) != pa_kind (arg
))
21074 return unify_invalid (explain_p
);
21076 /* Immediately reject some pairs that won't unify because of
21077 cv-qualification mismatches. */
21078 if (TREE_CODE (arg
) == TREE_CODE (parm
)
21080 /* It is the elements of the array which hold the cv quals of an array
21081 type, and the elements might be template type parms. We'll check
21082 when we recurse. */
21083 && TREE_CODE (arg
) != ARRAY_TYPE
21084 /* We check the cv-qualifiers when unifying with template type
21085 parameters below. We want to allow ARG `const T' to unify with
21086 PARM `T' for example, when computing which of two templates
21087 is more specialized, for example. */
21088 && TREE_CODE (arg
) != TEMPLATE_TYPE_PARM
21089 && !check_cv_quals_for_unify (strict_in
, arg
, parm
))
21090 return unify_cv_qual_mismatch (explain_p
, parm
, arg
);
21092 if (!(strict
& UNIFY_ALLOW_OUTER_LEVEL
)
21093 && TYPE_P (parm
) && !CP_TYPE_CONST_P (parm
))
21094 strict
&= ~UNIFY_ALLOW_MORE_CV_QUAL
;
21095 strict
&= ~UNIFY_ALLOW_OUTER_LEVEL
;
21096 strict
&= ~UNIFY_ALLOW_DERIVED
;
21097 strict
&= ~UNIFY_ALLOW_OUTER_MORE_CV_QUAL
;
21098 strict
&= ~UNIFY_ALLOW_OUTER_LESS_CV_QUAL
;
21100 switch (TREE_CODE (parm
))
21102 case TYPENAME_TYPE
:
21104 case UNBOUND_CLASS_TEMPLATE
:
21105 /* In a type which contains a nested-name-specifier, template
21106 argument values cannot be deduced for template parameters used
21107 within the nested-name-specifier. */
21108 return unify_success (explain_p
);
21110 case TEMPLATE_TYPE_PARM
:
21111 case TEMPLATE_TEMPLATE_PARM
:
21112 case BOUND_TEMPLATE_TEMPLATE_PARM
:
21113 tparm
= TREE_VALUE (TREE_VEC_ELT (tparms
, 0));
21114 if (error_operand_p (tparm
))
21115 return unify_invalid (explain_p
);
21117 if (TEMPLATE_TYPE_LEVEL (parm
)
21118 != template_decl_level (tparm
))
21119 /* The PARM is not one we're trying to unify. Just check
21120 to see if it matches ARG. */
21122 if (TREE_CODE (arg
) == TREE_CODE (parm
)
21123 && (is_auto (parm
) ? is_auto (arg
)
21124 : same_type_p (parm
, arg
)))
21125 return unify_success (explain_p
);
21127 return unify_type_mismatch (explain_p
, parm
, arg
);
21129 idx
= TEMPLATE_TYPE_IDX (parm
);
21130 targ
= TREE_VEC_ELT (INNERMOST_TEMPLATE_ARGS (targs
), idx
);
21131 tparm
= TREE_VALUE (TREE_VEC_ELT (tparms
, idx
));
21132 if (error_operand_p (tparm
))
21133 return unify_invalid (explain_p
);
21135 /* Check for mixed types and values. */
21136 if ((TREE_CODE (parm
) == TEMPLATE_TYPE_PARM
21137 && TREE_CODE (tparm
) != TYPE_DECL
)
21138 || (TREE_CODE (parm
) == TEMPLATE_TEMPLATE_PARM
21139 && TREE_CODE (tparm
) != TEMPLATE_DECL
))
21140 gcc_unreachable ();
21142 if (TREE_CODE (parm
) == BOUND_TEMPLATE_TEMPLATE_PARM
)
21144 if ((strict_in
& UNIFY_ALLOW_DERIVED
)
21145 && CLASS_TYPE_P (arg
))
21147 /* First try to match ARG directly. */
21148 tree t
= try_class_unification (tparms
, targs
, parm
, arg
,
21152 /* Otherwise, look for a suitable base of ARG, as below. */
21153 enum template_base_result r
;
21154 r
= get_template_base (tparms
, targs
, parm
, arg
,
21157 return unify_no_common_base (explain_p
, r
, parm
, arg
);
21161 /* ARG must be constructed from a template class or a template
21162 template parameter. */
21163 else if (TREE_CODE (arg
) != BOUND_TEMPLATE_TEMPLATE_PARM
21164 && !CLASSTYPE_SPECIALIZATION_OF_PRIMARY_TEMPLATE_P (arg
))
21165 return unify_template_deduction_failure (explain_p
, parm
, arg
);
21167 /* Deduce arguments T, i from TT<T> or TT<i>. */
21168 if (unify_bound_ttp_args (tparms
, targs
, parm
, arg
, explain_p
))
21171 arg
= TYPE_TI_TEMPLATE (arg
);
21173 /* Fall through to deduce template name. */
21176 if (TREE_CODE (parm
) == TEMPLATE_TEMPLATE_PARM
21177 || TREE_CODE (parm
) == BOUND_TEMPLATE_TEMPLATE_PARM
)
21179 /* Deduce template name TT from TT, TT<>, TT<T> and TT<i>. */
21181 /* Simple cases: Value already set, does match or doesn't. */
21182 if (targ
!= NULL_TREE
&& template_args_equal (targ
, arg
))
21183 return unify_success (explain_p
);
21185 return unify_inconsistency (explain_p
, parm
, targ
, arg
);
21189 /* If PARM is `const T' and ARG is only `int', we don't have
21190 a match unless we are allowing additional qualification.
21191 If ARG is `const int' and PARM is just `T' that's OK;
21192 that binds `const int' to `T'. */
21193 if (!check_cv_quals_for_unify (strict_in
| UNIFY_ALLOW_LESS_CV_QUAL
,
21195 return unify_cv_qual_mismatch (explain_p
, parm
, arg
);
21197 /* Consider the case where ARG is `const volatile int' and
21198 PARM is `const T'. Then, T should be `volatile int'. */
21199 arg
= cp_build_qualified_type_real
21200 (arg
, cp_type_quals (arg
) & ~cp_type_quals (parm
), tf_none
);
21201 if (arg
== error_mark_node
)
21202 return unify_invalid (explain_p
);
21204 /* Simple cases: Value already set, does match or doesn't. */
21205 if (targ
!= NULL_TREE
&& same_type_p (targ
, arg
))
21206 return unify_success (explain_p
);
21208 return unify_inconsistency (explain_p
, parm
, targ
, arg
);
21210 /* Make sure that ARG is not a variable-sized array. (Note
21211 that were talking about variable-sized arrays (like
21212 `int[n]'), rather than arrays of unknown size (like
21213 `int[]').) We'll get very confused by such a type since
21214 the bound of the array is not constant, and therefore
21215 not mangleable. Besides, such types are not allowed in
21216 ISO C++, so we can do as we please here. We do allow
21217 them for 'auto' deduction, since that isn't ABI-exposed. */
21218 if (!is_auto (parm
) && variably_modified_type_p (arg
, NULL_TREE
))
21219 return unify_vla_arg (explain_p
, arg
);
21221 /* Strip typedefs as in convert_template_argument. */
21222 arg
= canonicalize_type_argument (arg
, tf_none
);
21225 /* If ARG is a parameter pack or an expansion, we cannot unify
21226 against it unless PARM is also a parameter pack. */
21227 if ((template_parameter_pack_p (arg
) || PACK_EXPANSION_P (arg
))
21228 && !template_parameter_pack_p (parm
))
21229 return unify_parameter_pack_mismatch (explain_p
, parm
, arg
);
21231 /* If the argument deduction results is a METHOD_TYPE,
21232 then there is a problem.
21233 METHOD_TYPE doesn't map to any real C++ type the result of
21234 the deduction can not be of that type. */
21235 if (TREE_CODE (arg
) == METHOD_TYPE
)
21236 return unify_method_type_error (explain_p
, arg
);
21238 TREE_VEC_ELT (INNERMOST_TEMPLATE_ARGS (targs
), idx
) = arg
;
21239 return unify_success (explain_p
);
21241 case TEMPLATE_PARM_INDEX
:
21242 tparm
= TREE_VALUE (TREE_VEC_ELT (tparms
, 0));
21243 if (error_operand_p (tparm
))
21244 return unify_invalid (explain_p
);
21246 if (TEMPLATE_PARM_LEVEL (parm
)
21247 != template_decl_level (tparm
))
21249 /* The PARM is not one we're trying to unify. Just check
21250 to see if it matches ARG. */
21251 int result
= !(TREE_CODE (arg
) == TREE_CODE (parm
)
21252 && cp_tree_equal (parm
, arg
));
21254 unify_expression_unequal (explain_p
, parm
, arg
);
21258 idx
= TEMPLATE_PARM_IDX (parm
);
21259 targ
= TREE_VEC_ELT (INNERMOST_TEMPLATE_ARGS (targs
), idx
);
21263 if ((strict
& UNIFY_ALLOW_INTEGER
)
21264 && TREE_TYPE (targ
) && TREE_TYPE (arg
)
21265 && CP_INTEGRAL_TYPE_P (TREE_TYPE (targ
)))
21266 /* We're deducing from an array bound, the type doesn't matter. */
21267 arg
= fold_convert (TREE_TYPE (targ
), arg
);
21268 int x
= !cp_tree_equal (targ
, arg
);
21270 unify_inconsistency (explain_p
, parm
, targ
, arg
);
21274 /* [temp.deduct.type] If, in the declaration of a function template
21275 with a non-type template-parameter, the non-type
21276 template-parameter is used in an expression in the function
21277 parameter-list and, if the corresponding template-argument is
21278 deduced, the template-argument type shall match the type of the
21279 template-parameter exactly, except that a template-argument
21280 deduced from an array bound may be of any integral type.
21281 The non-type parameter might use already deduced type parameters. */
21282 tparm
= TREE_TYPE (parm
);
21283 if (TEMPLATE_PARM_LEVEL (parm
) > TMPL_ARGS_DEPTH (targs
))
21284 /* We don't have enough levels of args to do any substitution. This
21285 can happen in the context of -fnew-ttp-matching. */;
21288 ++processing_template_decl
;
21289 tparm
= tsubst (tparm
, targs
, tf_none
, NULL_TREE
);
21290 --processing_template_decl
;
21292 if (tree a
= type_uses_auto (tparm
))
21294 tparm
= do_auto_deduction (tparm
, arg
, a
, complain
, adc_unify
);
21295 if (tparm
== error_mark_node
)
21300 if (!TREE_TYPE (arg
))
21301 /* Template-parameter dependent expression. Just accept it for now.
21302 It will later be processed in convert_template_argument. */
21304 else if (same_type_p (non_reference (TREE_TYPE (arg
)),
21305 non_reference (tparm
)))
21307 else if ((strict
& UNIFY_ALLOW_INTEGER
)
21308 && CP_INTEGRAL_TYPE_P (tparm
))
21309 /* Convert the ARG to the type of PARM; the deduced non-type
21310 template argument must exactly match the types of the
21311 corresponding parameter. */
21312 arg
= fold (build_nop (tparm
, arg
));
21313 else if (uses_template_parms (tparm
))
21315 /* We haven't deduced the type of this parameter yet. */
21316 if (cxx_dialect
>= cxx17
21317 /* We deduce from array bounds in try_array_deduction. */
21318 && !(strict
& UNIFY_ALLOW_INTEGER
))
21320 /* Deduce it from the non-type argument. */
21321 tree atype
= TREE_TYPE (arg
);
21322 RECUR_AND_CHECK_FAILURE (tparms
, targs
,
21324 UNIFY_ALLOW_NONE
, explain_p
);
21327 /* Try again later. */
21328 return unify_success (explain_p
);
21331 return unify_type_mismatch (explain_p
, tparm
, TREE_TYPE (arg
));
21333 /* If ARG is a parameter pack or an expansion, we cannot unify
21334 against it unless PARM is also a parameter pack. */
21335 if ((template_parameter_pack_p (arg
) || PACK_EXPANSION_P (arg
))
21336 && !TEMPLATE_PARM_PARAMETER_PACK (parm
))
21337 return unify_parameter_pack_mismatch (explain_p
, parm
, arg
);
21340 bool removed_attr
= false;
21341 arg
= strip_typedefs_expr (arg
, &removed_attr
);
21343 TREE_VEC_ELT (INNERMOST_TEMPLATE_ARGS (targs
), idx
) = arg
;
21344 return unify_success (explain_p
);
21348 /* A pointer-to-member constant can be unified only with
21349 another constant. */
21350 if (TREE_CODE (arg
) != PTRMEM_CST
)
21351 return unify_ptrmem_cst_mismatch (explain_p
, parm
, arg
);
21353 /* Just unify the class member. It would be useless (and possibly
21354 wrong, depending on the strict flags) to unify also
21355 PTRMEM_CST_CLASS, because we want to be sure that both parm and
21356 arg refer to the same variable, even if through different
21357 classes. For instance:
21359 struct A { int x; };
21362 Unification of &A::x and &B::x must succeed. */
21363 return unify (tparms
, targs
, PTRMEM_CST_MEMBER (parm
),
21364 PTRMEM_CST_MEMBER (arg
), strict
, explain_p
);
21369 if (!TYPE_PTR_P (arg
))
21370 return unify_type_mismatch (explain_p
, parm
, arg
);
21372 /* [temp.deduct.call]
21374 A can be another pointer or pointer to member type that can
21375 be converted to the deduced A via a qualification
21376 conversion (_conv.qual_).
21378 We pass down STRICT here rather than UNIFY_ALLOW_NONE.
21379 This will allow for additional cv-qualification of the
21380 pointed-to types if appropriate. */
21382 if (TREE_CODE (TREE_TYPE (arg
)) == RECORD_TYPE
)
21383 /* The derived-to-base conversion only persists through one
21384 level of pointers. */
21385 strict
|= (strict_in
& UNIFY_ALLOW_DERIVED
);
21387 return unify (tparms
, targs
, TREE_TYPE (parm
),
21388 TREE_TYPE (arg
), strict
, explain_p
);
21391 case REFERENCE_TYPE
:
21392 if (TREE_CODE (arg
) != REFERENCE_TYPE
)
21393 return unify_type_mismatch (explain_p
, parm
, arg
);
21394 return unify (tparms
, targs
, TREE_TYPE (parm
), TREE_TYPE (arg
),
21395 strict
& UNIFY_ALLOW_MORE_CV_QUAL
, explain_p
);
21398 if (TREE_CODE (arg
) != ARRAY_TYPE
)
21399 return unify_type_mismatch (explain_p
, parm
, arg
);
21400 if ((TYPE_DOMAIN (parm
) == NULL_TREE
)
21401 != (TYPE_DOMAIN (arg
) == NULL_TREE
))
21402 return unify_type_mismatch (explain_p
, parm
, arg
);
21403 RECUR_AND_CHECK_FAILURE (tparms
, targs
, TREE_TYPE (parm
), TREE_TYPE (arg
),
21404 strict
& UNIFY_ALLOW_MORE_CV_QUAL
, explain_p
);
21405 if (TYPE_DOMAIN (parm
) != NULL_TREE
)
21406 return unify_array_domain (tparms
, targs
, TYPE_DOMAIN (parm
),
21407 TYPE_DOMAIN (arg
), explain_p
);
21408 return unify_success (explain_p
);
21415 case ENUMERAL_TYPE
:
21418 if (TREE_CODE (arg
) != TREE_CODE (parm
))
21419 return unify_type_mismatch (explain_p
, parm
, arg
);
21421 /* We have already checked cv-qualification at the top of the
21423 if (!same_type_ignoring_top_level_qualifiers_p (arg
, parm
))
21424 return unify_type_mismatch (explain_p
, parm
, arg
);
21426 /* As far as unification is concerned, this wins. Later checks
21427 will invalidate it if necessary. */
21428 return unify_success (explain_p
);
21430 /* Types INTEGER_CST and MINUS_EXPR can come from array bounds. */
21431 /* Type INTEGER_CST can come from ordinary constant template args. */
21433 while (CONVERT_EXPR_P (arg
))
21434 arg
= TREE_OPERAND (arg
, 0);
21436 if (TREE_CODE (arg
) != INTEGER_CST
)
21437 return unify_template_argument_mismatch (explain_p
, parm
, arg
);
21438 return (tree_int_cst_equal (parm
, arg
)
21439 ? unify_success (explain_p
)
21440 : unify_template_argument_mismatch (explain_p
, parm
, arg
));
21444 int i
, len
, argslen
;
21445 int parm_variadic_p
= 0;
21447 if (TREE_CODE (arg
) != TREE_VEC
)
21448 return unify_template_argument_mismatch (explain_p
, parm
, arg
);
21450 len
= TREE_VEC_LENGTH (parm
);
21451 argslen
= TREE_VEC_LENGTH (arg
);
21453 /* Check for pack expansions in the parameters. */
21454 for (i
= 0; i
< len
; ++i
)
21456 if (PACK_EXPANSION_P (TREE_VEC_ELT (parm
, i
)))
21459 /* We can unify against something with a trailing
21461 parm_variadic_p
= 1;
21463 /* [temp.deduct.type]/9: If the template argument list of
21464 P contains a pack expansion that is not the last
21465 template argument, the entire template argument list
21466 is a non-deduced context. */
21467 return unify_success (explain_p
);
21471 /* If we don't have enough arguments to satisfy the parameters
21472 (not counting the pack expression at the end), or we have
21473 too many arguments for a parameter list that doesn't end in
21474 a pack expression, we can't unify. */
21475 if (parm_variadic_p
21476 ? argslen
< len
- parm_variadic_p
21478 return unify_arity (explain_p
, TREE_VEC_LENGTH (arg
), len
);
21480 /* Unify all of the parameters that precede the (optional)
21481 pack expression. */
21482 for (i
= 0; i
< len
- parm_variadic_p
; ++i
)
21484 RECUR_AND_CHECK_FAILURE (tparms
, targs
,
21485 TREE_VEC_ELT (parm
, i
),
21486 TREE_VEC_ELT (arg
, i
),
21487 UNIFY_ALLOW_NONE
, explain_p
);
21489 if (parm_variadic_p
)
21490 return unify_pack_expansion (tparms
, targs
, parm
, arg
,
21492 /*subr=*/true, explain_p
);
21493 return unify_success (explain_p
);
21498 if (TREE_CODE (arg
) != TREE_CODE (parm
))
21499 return unify_type_mismatch (explain_p
, parm
, arg
);
21501 if (TYPE_PTRMEMFUNC_P (parm
))
21503 if (!TYPE_PTRMEMFUNC_P (arg
))
21504 return unify_type_mismatch (explain_p
, parm
, arg
);
21506 return unify (tparms
, targs
,
21507 TYPE_PTRMEMFUNC_FN_TYPE (parm
),
21508 TYPE_PTRMEMFUNC_FN_TYPE (arg
),
21509 strict
, explain_p
);
21511 else if (TYPE_PTRMEMFUNC_P (arg
))
21512 return unify_type_mismatch (explain_p
, parm
, arg
);
21514 if (CLASSTYPE_TEMPLATE_INFO (parm
))
21516 tree t
= NULL_TREE
;
21518 if (strict_in
& UNIFY_ALLOW_DERIVED
)
21520 /* First, we try to unify the PARM and ARG directly. */
21521 t
= try_class_unification (tparms
, targs
,
21522 parm
, arg
, explain_p
);
21526 /* Fallback to the special case allowed in
21527 [temp.deduct.call]:
21529 If P is a class, and P has the form
21530 template-id, then A can be a derived class of
21531 the deduced A. Likewise, if P is a pointer to
21532 a class of the form template-id, A can be a
21533 pointer to a derived class pointed to by the
21535 enum template_base_result r
;
21536 r
= get_template_base (tparms
, targs
, parm
, arg
,
21541 /* Don't give the derived diagnostic if we're
21542 already dealing with the same template. */
21544 = (CLASSTYPE_TEMPLATE_INFO (arg
)
21545 && (CLASSTYPE_TI_TEMPLATE (parm
)
21546 == CLASSTYPE_TI_TEMPLATE (arg
)));
21547 return unify_no_common_base (explain_p
&& !same_template
,
21552 else if (CLASSTYPE_TEMPLATE_INFO (arg
)
21553 && (CLASSTYPE_TI_TEMPLATE (parm
)
21554 == CLASSTYPE_TI_TEMPLATE (arg
)))
21555 /* Perhaps PARM is something like S<U> and ARG is S<int>.
21556 Then, we should unify `int' and `U'. */
21559 /* There's no chance of unification succeeding. */
21560 return unify_type_mismatch (explain_p
, parm
, arg
);
21562 return unify (tparms
, targs
, CLASSTYPE_TI_ARGS (parm
),
21563 CLASSTYPE_TI_ARGS (t
), UNIFY_ALLOW_NONE
, explain_p
);
21565 else if (!same_type_ignoring_top_level_qualifiers_p (parm
, arg
))
21566 return unify_type_mismatch (explain_p
, parm
, arg
);
21567 return unify_success (explain_p
);
21570 case FUNCTION_TYPE
:
21572 unsigned int nargs
;
21577 if (TREE_CODE (arg
) != TREE_CODE (parm
))
21578 return unify_type_mismatch (explain_p
, parm
, arg
);
21580 /* CV qualifications for methods can never be deduced, they must
21581 match exactly. We need to check them explicitly here,
21582 because type_unification_real treats them as any other
21583 cv-qualified parameter. */
21584 if (TREE_CODE (parm
) == METHOD_TYPE
21585 && (!check_cv_quals_for_unify
21587 class_of_this_parm (arg
),
21588 class_of_this_parm (parm
))))
21589 return unify_cv_qual_mismatch (explain_p
, parm
, arg
);
21590 if (TREE_CODE (arg
) == FUNCTION_TYPE
21591 && type_memfn_quals (parm
) != type_memfn_quals (arg
))
21592 return unify_cv_qual_mismatch (explain_p
, parm
, arg
);
21593 if (type_memfn_rqual (parm
) != type_memfn_rqual (arg
))
21594 return unify_type_mismatch (explain_p
, parm
, arg
);
21596 RECUR_AND_CHECK_FAILURE (tparms
, targs
, TREE_TYPE (parm
),
21597 TREE_TYPE (arg
), UNIFY_ALLOW_NONE
, explain_p
);
21599 nargs
= list_length (TYPE_ARG_TYPES (arg
));
21600 args
= XALLOCAVEC (tree
, nargs
);
21601 for (a
= TYPE_ARG_TYPES (arg
), i
= 0;
21602 a
!= NULL_TREE
&& a
!= void_list_node
;
21603 a
= TREE_CHAIN (a
), ++i
)
21604 args
[i
] = TREE_VALUE (a
);
21607 if (type_unification_real (tparms
, targs
, TYPE_ARG_TYPES (parm
),
21608 args
, nargs
, 1, DEDUCE_EXACT
,
21609 LOOKUP_NORMAL
, NULL
, explain_p
))
21612 if (flag_noexcept_type
)
21614 tree pspec
= TYPE_RAISES_EXCEPTIONS (parm
);
21615 tree aspec
= canonical_eh_spec (TYPE_RAISES_EXCEPTIONS (arg
));
21616 if (pspec
== NULL_TREE
) pspec
= noexcept_false_spec
;
21617 if (aspec
== NULL_TREE
) aspec
= noexcept_false_spec
;
21618 if (TREE_PURPOSE (pspec
) && TREE_PURPOSE (aspec
)
21619 && uses_template_parms (TREE_PURPOSE (pspec
)))
21620 RECUR_AND_CHECK_FAILURE (tparms
, targs
, TREE_PURPOSE (pspec
),
21621 TREE_PURPOSE (aspec
),
21622 UNIFY_ALLOW_NONE
, explain_p
);
21623 else if (nothrow_spec_p (pspec
) && !nothrow_spec_p (aspec
))
21624 return unify_type_mismatch (explain_p
, parm
, arg
);
21631 /* Unify a pointer to member with a pointer to member function, which
21632 deduces the type of the member as a function type. */
21633 if (TYPE_PTRMEMFUNC_P (arg
))
21635 /* Check top-level cv qualifiers */
21636 if (!check_cv_quals_for_unify (UNIFY_ALLOW_NONE
, arg
, parm
))
21637 return unify_cv_qual_mismatch (explain_p
, parm
, arg
);
21639 RECUR_AND_CHECK_FAILURE (tparms
, targs
, TYPE_OFFSET_BASETYPE (parm
),
21640 TYPE_PTRMEMFUNC_OBJECT_TYPE (arg
),
21641 UNIFY_ALLOW_NONE
, explain_p
);
21643 /* Determine the type of the function we are unifying against. */
21644 tree fntype
= static_fn_type (arg
);
21646 return unify (tparms
, targs
, TREE_TYPE (parm
), fntype
, strict
, explain_p
);
21649 if (TREE_CODE (arg
) != OFFSET_TYPE
)
21650 return unify_type_mismatch (explain_p
, parm
, arg
);
21651 RECUR_AND_CHECK_FAILURE (tparms
, targs
, TYPE_OFFSET_BASETYPE (parm
),
21652 TYPE_OFFSET_BASETYPE (arg
),
21653 UNIFY_ALLOW_NONE
, explain_p
);
21654 return unify (tparms
, targs
, TREE_TYPE (parm
), TREE_TYPE (arg
),
21655 strict
, explain_p
);
21658 if (DECL_TEMPLATE_PARM_P (parm
))
21659 return unify (tparms
, targs
, DECL_INITIAL (parm
), arg
, strict
, explain_p
);
21660 if (arg
!= scalar_constant_value (parm
))
21661 return unify_template_argument_mismatch (explain_p
, parm
, arg
);
21662 return unify_success (explain_p
);
21665 case TEMPLATE_DECL
:
21666 /* Matched cases are handled by the ARG == PARM test above. */
21667 return unify_template_argument_mismatch (explain_p
, parm
, arg
);
21670 /* We might get a variable as a non-type template argument in parm if the
21671 corresponding parameter is type-dependent. Make any necessary
21672 adjustments based on whether arg is a reference. */
21673 if (CONSTANT_CLASS_P (arg
))
21674 parm
= fold_non_dependent_expr (parm
);
21675 else if (REFERENCE_REF_P (arg
))
21677 tree sub
= TREE_OPERAND (arg
, 0);
21679 if (TREE_CODE (sub
) == ADDR_EXPR
)
21680 arg
= TREE_OPERAND (sub
, 0);
21682 /* Now use the normal expression code to check whether they match. */
21685 case TYPE_ARGUMENT_PACK
:
21686 case NONTYPE_ARGUMENT_PACK
:
21687 return unify (tparms
, targs
, ARGUMENT_PACK_ARGS (parm
),
21688 ARGUMENT_PACK_ARGS (arg
), strict
, explain_p
);
21691 case DECLTYPE_TYPE
:
21692 case UNDERLYING_TYPE
:
21693 /* Cannot deduce anything from TYPEOF_TYPE, DECLTYPE_TYPE,
21694 or UNDERLYING_TYPE nodes. */
21695 return unify_success (explain_p
);
21698 /* Unification fails if we hit an error node. */
21699 return unify_invalid (explain_p
);
21702 if (REFERENCE_REF_P (parm
))
21704 bool pexp
= PACK_EXPANSION_P (arg
);
21706 arg
= PACK_EXPANSION_PATTERN (arg
);
21707 if (REFERENCE_REF_P (arg
))
21708 arg
= TREE_OPERAND (arg
, 0);
21710 arg
= make_pack_expansion (arg
, complain
);
21711 return unify (tparms
, targs
, TREE_OPERAND (parm
, 0), arg
,
21712 strict
, explain_p
);
21717 /* An unresolved overload is a nondeduced context. */
21718 if (is_overloaded_fn (parm
) || type_unknown_p (parm
))
21719 return unify_success (explain_p
);
21720 gcc_assert (EXPR_P (parm
) || TREE_CODE (parm
) == TRAIT_EXPR
);
21722 /* We must be looking at an expression. This can happen with
21726 void foo(S<I>, S<I + 2>);
21728 This is a "nondeduced context":
21732 The nondeduced contexts are:
21734 --A type that is a template-id in which one or more of
21735 the template-arguments is an expression that references
21736 a template-parameter.
21738 In these cases, we assume deduction succeeded, but don't
21739 actually infer any unifications. */
21741 if (!uses_template_parms (parm
)
21742 && !template_args_equal (parm
, arg
))
21743 return unify_expression_unequal (explain_p
, parm
, arg
);
21745 return unify_success (explain_p
);
21748 #undef RECUR_AND_CHECK_FAILURE
21750 /* Note that DECL can be defined in this translation unit, if
21754 mark_definable (tree decl
)
21757 DECL_NOT_REALLY_EXTERN (decl
) = 1;
21758 FOR_EACH_CLONE (clone
, decl
)
21759 DECL_NOT_REALLY_EXTERN (clone
) = 1;
21762 /* Called if RESULT is explicitly instantiated, or is a member of an
21763 explicitly instantiated class. */
21766 mark_decl_instantiated (tree result
, int extern_p
)
21768 SET_DECL_EXPLICIT_INSTANTIATION (result
);
21770 /* If this entity has already been written out, it's too late to
21771 make any modifications. */
21772 if (TREE_ASM_WRITTEN (result
))
21775 /* For anonymous namespace we don't need to do anything. */
21776 if (decl_anon_ns_mem_p (result
))
21778 gcc_assert (!TREE_PUBLIC (result
));
21782 if (TREE_CODE (result
) != FUNCTION_DECL
)
21783 /* The TREE_PUBLIC flag for function declarations will have been
21784 set correctly by tsubst. */
21785 TREE_PUBLIC (result
) = 1;
21787 /* This might have been set by an earlier implicit instantiation. */
21788 DECL_COMDAT (result
) = 0;
21791 DECL_NOT_REALLY_EXTERN (result
) = 0;
21794 mark_definable (result
);
21795 mark_needed (result
);
21796 /* Always make artificials weak. */
21797 if (DECL_ARTIFICIAL (result
) && flag_weak
)
21798 comdat_linkage (result
);
21799 /* For WIN32 we also want to put explicit instantiations in
21800 linkonce sections. */
21801 else if (TREE_PUBLIC (result
))
21802 maybe_make_one_only (result
);
21805 /* If EXTERN_P, then this function will not be emitted -- unless
21806 followed by an explicit instantiation, at which point its linkage
21807 will be adjusted. If !EXTERN_P, then this function will be
21808 emitted here. In neither circumstance do we want
21809 import_export_decl to adjust the linkage. */
21810 DECL_INTERFACE_KNOWN (result
) = 1;
21813 /* Subroutine of more_specialized_fn: check whether TARGS is missing any
21814 important template arguments. If any are missing, we check whether
21815 they're important by using error_mark_node for substituting into any
21816 args that were used for partial ordering (the ones between ARGS and END)
21817 and seeing if it bubbles up. */
21820 check_undeduced_parms (tree targs
, tree args
, tree end
)
21822 bool found
= false;
21824 for (i
= TREE_VEC_LENGTH (targs
) - 1; i
>= 0; --i
)
21825 if (TREE_VEC_ELT (targs
, i
) == NULL_TREE
)
21828 TREE_VEC_ELT (targs
, i
) = error_mark_node
;
21832 tree substed
= tsubst_arg_types (args
, targs
, end
, tf_none
, NULL_TREE
);
21833 if (substed
== error_mark_node
)
21839 /* Given two function templates PAT1 and PAT2, return:
21841 1 if PAT1 is more specialized than PAT2 as described in [temp.func.order].
21842 -1 if PAT2 is more specialized than PAT1.
21843 0 if neither is more specialized.
21845 LEN indicates the number of parameters we should consider
21846 (defaulted parameters should not be considered).
21848 The 1998 std underspecified function template partial ordering, and
21849 DR214 addresses the issue. We take pairs of arguments, one from
21850 each of the templates, and deduce them against each other. One of
21851 the templates will be more specialized if all the *other*
21852 template's arguments deduce against its arguments and at least one
21853 of its arguments *does* *not* deduce against the other template's
21854 corresponding argument. Deduction is done as for class templates.
21855 The arguments used in deduction have reference and top level cv
21856 qualifiers removed. Iff both arguments were originally reference
21857 types *and* deduction succeeds in both directions, an lvalue reference
21858 wins against an rvalue reference and otherwise the template
21859 with the more cv-qualified argument wins for that pairing (if
21860 neither is more cv-qualified, they both are equal). Unlike regular
21861 deduction, after all the arguments have been deduced in this way,
21862 we do *not* verify the deduced template argument values can be
21863 substituted into non-deduced contexts.
21865 The logic can be a bit confusing here, because we look at deduce1 and
21866 targs1 to see if pat2 is at least as specialized, and vice versa; if we
21867 can find template arguments for pat1 to make arg1 look like arg2, that
21868 means that arg2 is at least as specialized as arg1. */
21871 more_specialized_fn (tree pat1
, tree pat2
, int len
)
21873 tree decl1
= DECL_TEMPLATE_RESULT (pat1
);
21874 tree decl2
= DECL_TEMPLATE_RESULT (pat2
);
21875 tree targs1
= make_tree_vec (DECL_NTPARMS (pat1
));
21876 tree targs2
= make_tree_vec (DECL_NTPARMS (pat2
));
21877 tree tparms1
= DECL_INNERMOST_TEMPLATE_PARMS (pat1
);
21878 tree tparms2
= DECL_INNERMOST_TEMPLATE_PARMS (pat2
);
21879 tree args1
= TYPE_ARG_TYPES (TREE_TYPE (decl1
));
21880 tree args2
= TYPE_ARG_TYPES (TREE_TYPE (decl2
));
21881 tree origs1
, origs2
;
21882 bool lose1
= false;
21883 bool lose2
= false;
21885 /* Remove the this parameter from non-static member functions. If
21886 one is a non-static member function and the other is not a static
21887 member function, remove the first parameter from that function
21888 also. This situation occurs for operator functions where we
21889 locate both a member function (with this pointer) and non-member
21890 operator (with explicit first operand). */
21891 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (decl1
))
21893 len
--; /* LEN is the number of significant arguments for DECL1 */
21894 args1
= TREE_CHAIN (args1
);
21895 if (!DECL_STATIC_FUNCTION_P (decl2
))
21896 args2
= TREE_CHAIN (args2
);
21898 else if (DECL_NONSTATIC_MEMBER_FUNCTION_P (decl2
))
21900 args2
= TREE_CHAIN (args2
);
21901 if (!DECL_STATIC_FUNCTION_P (decl1
))
21904 args1
= TREE_CHAIN (args1
);
21908 /* If only one is a conversion operator, they are unordered. */
21909 if (DECL_CONV_FN_P (decl1
) != DECL_CONV_FN_P (decl2
))
21912 /* Consider the return type for a conversion function */
21913 if (DECL_CONV_FN_P (decl1
))
21915 args1
= tree_cons (NULL_TREE
, TREE_TYPE (TREE_TYPE (decl1
)), args1
);
21916 args2
= tree_cons (NULL_TREE
, TREE_TYPE (TREE_TYPE (decl2
)), args2
);
21920 processing_template_decl
++;
21926 /* Stop when an ellipsis is seen. */
21927 && args1
!= NULL_TREE
&& args2
!= NULL_TREE
)
21929 tree arg1
= TREE_VALUE (args1
);
21930 tree arg2
= TREE_VALUE (args2
);
21931 int deduce1
, deduce2
;
21937 if (TREE_CODE (arg1
) == TYPE_PACK_EXPANSION
21938 && TREE_CODE (arg2
) == TYPE_PACK_EXPANSION
)
21940 /* When both arguments are pack expansions, we need only
21941 unify the patterns themselves. */
21942 arg1
= PACK_EXPANSION_PATTERN (arg1
);
21943 arg2
= PACK_EXPANSION_PATTERN (arg2
);
21945 /* This is the last comparison we need to do. */
21949 /* DR 1847: If a particular P contains no template-parameters that
21950 participate in template argument deduction, that P is not used to
21951 determine the ordering. */
21952 if (!uses_deducible_template_parms (arg1
)
21953 && !uses_deducible_template_parms (arg2
))
21956 if (TREE_CODE (arg1
) == REFERENCE_TYPE
)
21958 ref1
= TYPE_REF_IS_RVALUE (arg1
) + 1;
21959 arg1
= TREE_TYPE (arg1
);
21960 quals1
= cp_type_quals (arg1
);
21963 if (TREE_CODE (arg2
) == REFERENCE_TYPE
)
21965 ref2
= TYPE_REF_IS_RVALUE (arg2
) + 1;
21966 arg2
= TREE_TYPE (arg2
);
21967 quals2
= cp_type_quals (arg2
);
21970 arg1
= TYPE_MAIN_VARIANT (arg1
);
21971 arg2
= TYPE_MAIN_VARIANT (arg2
);
21973 if (TREE_CODE (arg1
) == TYPE_PACK_EXPANSION
)
21975 int i
, len2
= remaining_arguments (args2
);
21976 tree parmvec
= make_tree_vec (1);
21977 tree argvec
= make_tree_vec (len2
);
21980 /* Setup the parameter vector, which contains only ARG1. */
21981 TREE_VEC_ELT (parmvec
, 0) = arg1
;
21983 /* Setup the argument vector, which contains the remaining
21985 for (i
= 0; i
< len2
; i
++, ta
= TREE_CHAIN (ta
))
21986 TREE_VEC_ELT (argvec
, i
) = TREE_VALUE (ta
);
21988 deduce1
= (unify_pack_expansion (tparms1
, targs1
, parmvec
,
21989 argvec
, DEDUCE_EXACT
,
21990 /*subr=*/true, /*explain_p=*/false)
21993 /* We cannot deduce in the other direction, because ARG1 is
21994 a pack expansion but ARG2 is not. */
21997 else if (TREE_CODE (arg2
) == TYPE_PACK_EXPANSION
)
21999 int i
, len1
= remaining_arguments (args1
);
22000 tree parmvec
= make_tree_vec (1);
22001 tree argvec
= make_tree_vec (len1
);
22004 /* Setup the parameter vector, which contains only ARG1. */
22005 TREE_VEC_ELT (parmvec
, 0) = arg2
;
22007 /* Setup the argument vector, which contains the remaining
22009 for (i
= 0; i
< len1
; i
++, ta
= TREE_CHAIN (ta
))
22010 TREE_VEC_ELT (argvec
, i
) = TREE_VALUE (ta
);
22012 deduce2
= (unify_pack_expansion (tparms2
, targs2
, parmvec
,
22013 argvec
, DEDUCE_EXACT
,
22014 /*subr=*/true, /*explain_p=*/false)
22017 /* We cannot deduce in the other direction, because ARG2 is
22018 a pack expansion but ARG1 is not.*/
22024 /* The normal case, where neither argument is a pack
22026 deduce1
= (unify (tparms1
, targs1
, arg1
, arg2
,
22027 UNIFY_ALLOW_NONE
, /*explain_p=*/false)
22029 deduce2
= (unify (tparms2
, targs2
, arg2
, arg1
,
22030 UNIFY_ALLOW_NONE
, /*explain_p=*/false)
22034 /* If we couldn't deduce arguments for tparms1 to make arg1 match
22035 arg2, then arg2 is not as specialized as arg1. */
22041 /* "If, for a given type, deduction succeeds in both directions
22042 (i.e., the types are identical after the transformations above)
22043 and both P and A were reference types (before being replaced with
22044 the type referred to above):
22045 - if the type from the argument template was an lvalue reference and
22046 the type from the parameter template was not, the argument type is
22047 considered to be more specialized than the other; otherwise,
22048 - if the type from the argument template is more cv-qualified
22049 than the type from the parameter template (as described above),
22050 the argument type is considered to be more specialized than the other;
22052 - neither type is more specialized than the other." */
22054 if (deduce1
&& deduce2
)
22056 if (ref1
&& ref2
&& ref1
!= ref2
)
22063 else if (quals1
!= quals2
&& quals1
>= 0 && quals2
>= 0)
22065 if ((quals1
& quals2
) == quals2
)
22067 if ((quals1
& quals2
) == quals1
)
22072 if (lose1
&& lose2
)
22073 /* We've failed to deduce something in either direction.
22074 These must be unordered. */
22079 if (TREE_CODE (arg1
) == TYPE_PACK_EXPANSION
22080 || TREE_CODE (arg2
) == TYPE_PACK_EXPANSION
)
22081 /* We have already processed all of the arguments in our
22082 handing of the pack expansion type. */
22085 args1
= TREE_CHAIN (args1
);
22086 args2
= TREE_CHAIN (args2
);
22089 /* "In most cases, all template parameters must have values in order for
22090 deduction to succeed, but for partial ordering purposes a template
22091 parameter may remain without a value provided it is not used in the
22092 types being used for partial ordering."
22094 Thus, if we are missing any of the targs1 we need to substitute into
22095 origs1, then pat2 is not as specialized as pat1. This can happen when
22096 there is a nondeduced context. */
22097 if (!lose2
&& check_undeduced_parms (targs1
, origs1
, args1
))
22099 if (!lose1
&& check_undeduced_parms (targs2
, origs2
, args2
))
22102 processing_template_decl
--;
22104 /* If both deductions succeed, the partial ordering selects the more
22105 constrained template. */
22106 if (!lose1
&& !lose2
)
22108 tree c1
= get_constraints (DECL_TEMPLATE_RESULT (pat1
));
22109 tree c2
= get_constraints (DECL_TEMPLATE_RESULT (pat2
));
22110 lose1
= !subsumes_constraints (c1
, c2
);
22111 lose2
= !subsumes_constraints (c2
, c1
);
22114 /* All things being equal, if the next argument is a pack expansion
22115 for one function but not for the other, prefer the
22116 non-variadic function. FIXME this is bogus; see c++/41958. */
22118 && args1
&& TREE_VALUE (args1
)
22119 && args2
&& TREE_VALUE (args2
))
22121 lose1
= TREE_CODE (TREE_VALUE (args1
)) == TYPE_PACK_EXPANSION
;
22122 lose2
= TREE_CODE (TREE_VALUE (args2
)) == TYPE_PACK_EXPANSION
;
22125 if (lose1
== lose2
)
22133 /* Determine which of two partial specializations of TMPL is more
22136 PAT1 is a TREE_LIST whose TREE_VALUE is the TEMPLATE_DECL corresponding
22137 to the first partial specialization. The TREE_PURPOSE is the
22138 innermost set of template parameters for the partial
22139 specialization. PAT2 is similar, but for the second template.
22141 Return 1 if the first partial specialization is more specialized;
22142 -1 if the second is more specialized; 0 if neither is more
22145 See [temp.class.order] for information about determining which of
22146 two templates is more specialized. */
22149 more_specialized_partial_spec (tree tmpl
, tree pat1
, tree pat2
)
22153 bool any_deductions
= false;
22155 tree tmpl1
= TREE_VALUE (pat1
);
22156 tree tmpl2
= TREE_VALUE (pat2
);
22157 tree specargs1
= TI_ARGS (get_template_info (DECL_TEMPLATE_RESULT (tmpl1
)));
22158 tree specargs2
= TI_ARGS (get_template_info (DECL_TEMPLATE_RESULT (tmpl2
)));
22160 /* Just like what happens for functions, if we are ordering between
22161 different template specializations, we may encounter dependent
22162 types in the arguments, and we need our dependency check functions
22163 to behave correctly. */
22164 ++processing_template_decl
;
22165 targs
= get_partial_spec_bindings (tmpl
, tmpl1
, specargs2
);
22169 any_deductions
= true;
22172 targs
= get_partial_spec_bindings (tmpl
, tmpl2
, specargs1
);
22176 any_deductions
= true;
22178 --processing_template_decl
;
22180 /* If both deductions succeed, the partial ordering selects the more
22181 constrained template. */
22182 if (!winner
&& any_deductions
)
22183 return more_constrained (tmpl1
, tmpl2
);
22185 /* In the case of a tie where at least one of the templates
22186 has a parameter pack at the end, the template with the most
22187 non-packed parameters wins. */
22190 && (template_args_variadic_p (TREE_PURPOSE (pat1
))
22191 || template_args_variadic_p (TREE_PURPOSE (pat2
))))
22193 tree args1
= INNERMOST_TEMPLATE_ARGS (TREE_PURPOSE (pat1
));
22194 tree args2
= INNERMOST_TEMPLATE_ARGS (TREE_PURPOSE (pat2
));
22195 int len1
= TREE_VEC_LENGTH (args1
);
22196 int len2
= TREE_VEC_LENGTH (args2
);
22198 /* We don't count the pack expansion at the end. */
22199 if (template_args_variadic_p (TREE_PURPOSE (pat1
)))
22201 if (template_args_variadic_p (TREE_PURPOSE (pat2
)))
22206 else if (len1
< len2
)
22213 /* Return the template arguments that will produce the function signature
22214 DECL from the function template FN, with the explicit template
22215 arguments EXPLICIT_ARGS. If CHECK_RETTYPE is true, the return type must
22216 also match. Return NULL_TREE if no satisfactory arguments could be
22220 get_bindings (tree fn
, tree decl
, tree explicit_args
, bool check_rettype
)
22222 int ntparms
= DECL_NTPARMS (fn
);
22223 tree targs
= make_tree_vec (ntparms
);
22224 tree decl_type
= TREE_TYPE (decl
);
22225 tree decl_arg_types
;
22227 unsigned int nargs
, ix
;
22230 gcc_assert (decl
!= DECL_TEMPLATE_RESULT (fn
));
22232 /* Never do unification on the 'this' parameter. */
22233 decl_arg_types
= skip_artificial_parms_for (decl
,
22234 TYPE_ARG_TYPES (decl_type
));
22236 nargs
= list_length (decl_arg_types
);
22237 args
= XALLOCAVEC (tree
, nargs
);
22238 for (arg
= decl_arg_types
, ix
= 0;
22239 arg
!= NULL_TREE
&& arg
!= void_list_node
;
22240 arg
= TREE_CHAIN (arg
), ++ix
)
22241 args
[ix
] = TREE_VALUE (arg
);
22243 if (fn_type_unification (fn
, explicit_args
, targs
,
22245 (check_rettype
|| DECL_CONV_FN_P (fn
)
22246 ? TREE_TYPE (decl_type
) : NULL_TREE
),
22247 DEDUCE_EXACT
, LOOKUP_NORMAL
, /*explain_p=*/false,
22249 == error_mark_node
)
22255 /* Return the innermost template arguments that, when applied to a partial
22256 specialization SPEC_TMPL of TMPL, yield the ARGS.
22258 For example, suppose we have:
22260 template <class T, class U> struct S {};
22261 template <class T> struct S<T*, int> {};
22263 Then, suppose we want to get `S<double*, int>'. SPEC_TMPL will be the
22264 partial specialization and the ARGS will be {double*, int}. The resulting
22265 vector will be {double}, indicating that `T' is bound to `double'. */
22268 get_partial_spec_bindings (tree tmpl
, tree spec_tmpl
, tree args
)
22270 tree tparms
= DECL_INNERMOST_TEMPLATE_PARMS (spec_tmpl
);
22272 = TI_ARGS (get_template_info (DECL_TEMPLATE_RESULT (spec_tmpl
)));
22273 int i
, ntparms
= TREE_VEC_LENGTH (tparms
);
22275 tree innermost_deduced_args
;
22277 innermost_deduced_args
= make_tree_vec (ntparms
);
22278 if (TMPL_ARGS_HAVE_MULTIPLE_LEVELS (args
))
22280 deduced_args
= copy_node (args
);
22281 SET_TMPL_ARGS_LEVEL (deduced_args
,
22282 TMPL_ARGS_DEPTH (deduced_args
),
22283 innermost_deduced_args
);
22286 deduced_args
= innermost_deduced_args
;
22288 bool tried_array_deduction
= (cxx_dialect
< cxx17
);
22290 if (unify (tparms
, deduced_args
,
22291 INNERMOST_TEMPLATE_ARGS (spec_args
),
22292 INNERMOST_TEMPLATE_ARGS (args
),
22293 UNIFY_ALLOW_NONE
, /*explain_p=*/false))
22296 for (i
= 0; i
< ntparms
; ++i
)
22297 if (! TREE_VEC_ELT (innermost_deduced_args
, i
))
22299 if (!tried_array_deduction
)
22301 try_array_deduction (tparms
, innermost_deduced_args
,
22302 INNERMOST_TEMPLATE_ARGS (spec_args
));
22303 tried_array_deduction
= true;
22304 if (TREE_VEC_ELT (innermost_deduced_args
, i
))
22310 tree tinst
= build_tree_list (spec_tmpl
, deduced_args
);
22311 if (!push_tinst_level (tinst
))
22313 excessive_deduction_depth
= true;
22317 /* Verify that nondeduced template arguments agree with the type
22318 obtained from argument deduction.
22322 struct A { typedef int X; };
22323 template <class T, class U> struct C {};
22324 template <class T> struct C<T, typename T::X> {};
22326 Then with the instantiation `C<A, int>', we can deduce that
22327 `T' is `A' but unify () does not check whether `typename T::X'
22329 spec_args
= tsubst (spec_args
, deduced_args
, tf_none
, NULL_TREE
);
22331 if (spec_args
!= error_mark_node
)
22332 spec_args
= coerce_template_parms (DECL_INNERMOST_TEMPLATE_PARMS (tmpl
),
22333 INNERMOST_TEMPLATE_ARGS (spec_args
),
22334 tmpl
, tf_none
, false, false);
22336 pop_tinst_level ();
22338 if (spec_args
== error_mark_node
22339 /* We only need to check the innermost arguments; the other
22340 arguments will always agree. */
22341 || !comp_template_args_porder (INNERMOST_TEMPLATE_ARGS (spec_args
),
22342 INNERMOST_TEMPLATE_ARGS (args
)))
22345 /* Now that we have bindings for all of the template arguments,
22346 ensure that the arguments deduced for the template template
22347 parameters have compatible template parameter lists. See the use
22348 of template_template_parm_bindings_ok_p in fn_type_unification
22349 for more information. */
22350 if (!template_template_parm_bindings_ok_p (tparms
, deduced_args
))
22353 return deduced_args
;
22356 // Compare two function templates T1 and T2 by deducing bindings
22357 // from one against the other. If both deductions succeed, compare
22358 // constraints to see which is more constrained.
22360 more_specialized_inst (tree t1
, tree t2
)
22365 if (get_bindings (t1
, DECL_TEMPLATE_RESULT (t2
), NULL_TREE
, true))
22371 if (get_bindings (t2
, DECL_TEMPLATE_RESULT (t1
), NULL_TREE
, true))
22377 // If both deductions succeed, then one may be more constrained.
22378 if (count
== 2 && fate
== 0)
22379 fate
= more_constrained (t1
, t2
);
22384 /* TEMPLATES is a TREE_LIST. Each TREE_VALUE is a TEMPLATE_DECL.
22385 Return the TREE_LIST node with the most specialized template, if
22386 any. If there is no most specialized template, the error_mark_node
22389 Note that this function does not look at, or modify, the
22390 TREE_PURPOSE or TREE_TYPE of any of the nodes. Since the node
22391 returned is one of the elements of INSTANTIATIONS, callers may
22392 store information in the TREE_PURPOSE or TREE_TYPE of the nodes,
22393 and retrieve it from the value returned. */
22396 most_specialized_instantiation (tree templates
)
22400 ++processing_template_decl
;
22403 for (fn
= TREE_CHAIN (templates
); fn
; fn
= TREE_CHAIN (fn
))
22405 gcc_assert (TREE_VALUE (champ
) != TREE_VALUE (fn
));
22406 int fate
= more_specialized_inst (TREE_VALUE (champ
), TREE_VALUE (fn
));
22411 /* Equally specialized, move to next function. If there
22412 is no next function, nothing's most specialized. */
22413 fn
= TREE_CHAIN (fn
);
22421 /* Now verify that champ is better than everything earlier in the
22422 instantiation list. */
22423 for (fn
= templates
; fn
!= champ
; fn
= TREE_CHAIN (fn
)) {
22424 if (more_specialized_inst (TREE_VALUE (champ
), TREE_VALUE (fn
)) != 1)
22431 processing_template_decl
--;
22434 return error_mark_node
;
22439 /* If DECL is a specialization of some template, return the most
22440 general such template. Otherwise, returns NULL_TREE.
22442 For example, given:
22444 template <class T> struct S { template <class U> void f(U); };
22446 if TMPL is `template <class U> void S<int>::f(U)' this will return
22447 the full template. This function will not trace past partial
22448 specializations, however. For example, given in addition:
22450 template <class T> struct S<T*> { template <class U> void f(U); };
22452 if TMPL is `template <class U> void S<int*>::f(U)' this will return
22453 `template <class T> template <class U> S<T*>::f(U)'. */
22456 most_general_template (tree decl
)
22458 if (TREE_CODE (decl
) != TEMPLATE_DECL
)
22460 if (tree tinfo
= get_template_info (decl
))
22461 decl
= TI_TEMPLATE (tinfo
);
22462 /* The TI_TEMPLATE can be an IDENTIFIER_NODE for a
22463 template friend, or a FIELD_DECL for a capture pack. */
22464 if (TREE_CODE (decl
) != TEMPLATE_DECL
)
22468 /* Look for more and more general templates. */
22469 while (DECL_LANG_SPECIFIC (decl
) && DECL_TEMPLATE_INFO (decl
))
22471 /* The DECL_TI_TEMPLATE can be an IDENTIFIER_NODE in some cases.
22472 (See cp-tree.h for details.) */
22473 if (TREE_CODE (DECL_TI_TEMPLATE (decl
)) != TEMPLATE_DECL
)
22476 if (CLASS_TYPE_P (TREE_TYPE (decl
))
22477 && !TYPE_DECL_ALIAS_P (TYPE_NAME (TREE_TYPE (decl
)))
22478 && CLASSTYPE_TEMPLATE_SPECIALIZATION (TREE_TYPE (decl
)))
22481 /* Stop if we run into an explicitly specialized class template. */
22482 if (!DECL_NAMESPACE_SCOPE_P (decl
)
22483 && DECL_CONTEXT (decl
)
22484 && CLASSTYPE_TEMPLATE_SPECIALIZATION (DECL_CONTEXT (decl
)))
22487 decl
= DECL_TI_TEMPLATE (decl
);
22493 /* Return the most specialized of the template partial specializations
22494 which can produce TARGET, a specialization of some class or variable
22495 template. The value returned is actually a TREE_LIST; the TREE_VALUE is
22496 a TEMPLATE_DECL node corresponding to the partial specialization, while
22497 the TREE_PURPOSE is the set of template arguments that must be
22498 substituted into the template pattern in order to generate TARGET.
22500 If the choice of partial specialization is ambiguous, a diagnostic
22501 is issued, and the error_mark_node is returned. If there are no
22502 partial specializations matching TARGET, then NULL_TREE is
22503 returned, indicating that the primary template should be used. */
22506 most_specialized_partial_spec (tree target
, tsubst_flags_t complain
)
22508 tree list
= NULL_TREE
;
22513 tree outer_args
= NULL_TREE
;
22516 if (TYPE_P (target
))
22518 tree tinfo
= CLASSTYPE_TEMPLATE_INFO (target
);
22519 tmpl
= TI_TEMPLATE (tinfo
);
22520 args
= TI_ARGS (tinfo
);
22522 else if (TREE_CODE (target
) == TEMPLATE_ID_EXPR
)
22524 tmpl
= TREE_OPERAND (target
, 0);
22525 args
= TREE_OPERAND (target
, 1);
22527 else if (VAR_P (target
))
22529 tree tinfo
= DECL_TEMPLATE_INFO (target
);
22530 tmpl
= TI_TEMPLATE (tinfo
);
22531 args
= TI_ARGS (tinfo
);
22534 gcc_unreachable ();
22536 tree main_tmpl
= most_general_template (tmpl
);
22538 /* For determining which partial specialization to use, only the
22539 innermost args are interesting. */
22540 if (TMPL_ARGS_HAVE_MULTIPLE_LEVELS (args
))
22542 outer_args
= strip_innermost_template_args (args
, 1);
22543 args
= INNERMOST_TEMPLATE_ARGS (args
);
22546 for (t
= DECL_TEMPLATE_SPECIALIZATIONS (main_tmpl
); t
; t
= TREE_CHAIN (t
))
22549 tree spec_tmpl
= TREE_VALUE (t
);
22553 /* Substitute in the template args from the enclosing class. */
22554 ++processing_template_decl
;
22555 spec_tmpl
= tsubst (spec_tmpl
, outer_args
, tf_none
, NULL_TREE
);
22556 --processing_template_decl
;
22559 if (spec_tmpl
== error_mark_node
)
22560 return error_mark_node
;
22562 spec_args
= get_partial_spec_bindings (tmpl
, spec_tmpl
, args
);
22566 spec_args
= add_to_template_args (outer_args
, spec_args
);
22568 /* Keep the candidate only if the constraints are satisfied,
22569 or if we're not compiling with concepts. */
22571 || constraints_satisfied_p (spec_tmpl
, spec_args
))
22573 list
= tree_cons (spec_args
, TREE_VALUE (t
), list
);
22574 TREE_TYPE (list
) = TREE_TYPE (t
);
22582 ambiguous_p
= false;
22585 t
= TREE_CHAIN (t
);
22586 for (; t
; t
= TREE_CHAIN (t
))
22588 fate
= more_specialized_partial_spec (tmpl
, champ
, t
);
22595 t
= TREE_CHAIN (t
);
22598 ambiguous_p
= true;
22607 for (t
= list
; t
&& t
!= champ
; t
= TREE_CHAIN (t
))
22609 fate
= more_specialized_partial_spec (tmpl
, champ
, t
);
22612 ambiguous_p
= true;
22620 char *spaces
= NULL
;
22621 if (!(complain
& tf_error
))
22622 return error_mark_node
;
22623 if (TYPE_P (target
))
22624 error ("ambiguous template instantiation for %q#T", target
);
22626 error ("ambiguous template instantiation for %q#D", target
);
22627 str
= ngettext ("candidate is:", "candidates are:", list_length (list
));
22628 for (t
= list
; t
; t
= TREE_CHAIN (t
))
22630 tree subst
= build_tree_list (TREE_VALUE (t
), TREE_PURPOSE (t
));
22631 inform (DECL_SOURCE_LOCATION (TREE_VALUE (t
)),
22632 "%s %#qS", spaces
? spaces
: str
, subst
);
22633 spaces
= spaces
? spaces
: get_spaces (str
);
22636 return error_mark_node
;
22642 /* Explicitly instantiate DECL. */
22645 do_decl_instantiation (tree decl
, tree storage
)
22647 tree result
= NULL_TREE
;
22650 if (!decl
|| decl
== error_mark_node
)
22651 /* An error occurred, for which grokdeclarator has already issued
22652 an appropriate message. */
22654 else if (! DECL_LANG_SPECIFIC (decl
))
22656 error ("explicit instantiation of non-template %q#D", decl
);
22660 bool var_templ
= (DECL_TEMPLATE_INFO (decl
)
22661 && variable_template_p (DECL_TI_TEMPLATE (decl
)));
22663 if (VAR_P (decl
) && !var_templ
)
22665 /* There is an asymmetry here in the way VAR_DECLs and
22666 FUNCTION_DECLs are handled by grokdeclarator. In the case of
22667 the latter, the DECL we get back will be marked as a
22668 template instantiation, and the appropriate
22669 DECL_TEMPLATE_INFO will be set up. This does not happen for
22670 VAR_DECLs so we do the lookup here. Probably, grokdeclarator
22671 should handle VAR_DECLs as it currently handles
22673 if (!DECL_CLASS_SCOPE_P (decl
))
22675 error ("%qD is not a static data member of a class template", decl
);
22678 result
= lookup_field (DECL_CONTEXT (decl
), DECL_NAME (decl
), 0, false);
22679 if (!result
|| !VAR_P (result
))
22681 error ("no matching template for %qD found", decl
);
22684 if (!same_type_p (TREE_TYPE (result
), TREE_TYPE (decl
)))
22686 error ("type %qT for explicit instantiation %qD does not match "
22687 "declared type %qT", TREE_TYPE (result
), decl
,
22692 else if (TREE_CODE (decl
) != FUNCTION_DECL
&& !var_templ
)
22694 error ("explicit instantiation of %q#D", decl
);
22700 /* Check for various error cases. Note that if the explicit
22701 instantiation is valid the RESULT will currently be marked as an
22702 *implicit* instantiation; DECL_EXPLICIT_INSTANTIATION is not set
22703 until we get here. */
22705 if (DECL_TEMPLATE_SPECIALIZATION (result
))
22707 /* DR 259 [temp.spec].
22709 Both an explicit instantiation and a declaration of an explicit
22710 specialization shall not appear in a program unless the explicit
22711 instantiation follows a declaration of the explicit specialization.
22713 For a given set of template parameters, if an explicit
22714 instantiation of a template appears after a declaration of an
22715 explicit specialization for that template, the explicit
22716 instantiation has no effect. */
22719 else if (DECL_EXPLICIT_INSTANTIATION (result
))
22723 No program shall explicitly instantiate any template more
22726 We check DECL_NOT_REALLY_EXTERN so as not to complain when
22727 the first instantiation was `extern' and the second is not,
22728 and EXTERN_P for the opposite case. */
22729 if (DECL_NOT_REALLY_EXTERN (result
) && !extern_p
)
22730 permerror (input_location
, "duplicate explicit instantiation of %q#D", result
);
22731 /* If an "extern" explicit instantiation follows an ordinary
22732 explicit instantiation, the template is instantiated. */
22736 else if (!DECL_IMPLICIT_INSTANTIATION (result
))
22738 error ("no matching template for %qD found", result
);
22741 else if (!DECL_TEMPLATE_INFO (result
))
22743 permerror (input_location
, "explicit instantiation of non-template %q#D", result
);
22747 if (storage
== NULL_TREE
)
22749 else if (storage
== ridpointers
[(int) RID_EXTERN
])
22751 if (!in_system_header_at (input_location
) && (cxx_dialect
== cxx98
))
22752 pedwarn (input_location
, OPT_Wpedantic
,
22753 "ISO C++ 1998 forbids the use of %<extern%> on explicit "
22758 error ("storage class %qD applied to template instantiation", storage
);
22760 check_explicit_instantiation_namespace (result
);
22761 mark_decl_instantiated (result
, extern_p
);
22763 instantiate_decl (result
, /*defer_ok=*/true,
22764 /*expl_inst_class_mem_p=*/false);
22768 mark_class_instantiated (tree t
, int extern_p
)
22770 SET_CLASSTYPE_EXPLICIT_INSTANTIATION (t
);
22771 SET_CLASSTYPE_INTERFACE_KNOWN (t
);
22772 CLASSTYPE_INTERFACE_ONLY (t
) = extern_p
;
22773 TYPE_DECL_SUPPRESS_DEBUG (TYPE_NAME (t
)) = extern_p
;
22776 CLASSTYPE_DEBUG_REQUESTED (t
) = 1;
22777 rest_of_type_compilation (t
, 1);
22781 /* Called from do_type_instantiation through binding_table_foreach to
22782 do recursive instantiation for the type bound in ENTRY. */
22784 bt_instantiate_type_proc (binding_entry entry
, void *data
)
22786 tree storage
= *(tree
*) data
;
22788 if (MAYBE_CLASS_TYPE_P (entry
->type
)
22789 && !uses_template_parms (CLASSTYPE_TI_ARGS (entry
->type
)))
22790 do_type_instantiation (TYPE_MAIN_DECL (entry
->type
), storage
, 0);
22793 /* Perform an explicit instantiation of template class T. STORAGE, if
22794 non-null, is the RID for extern, inline or static. COMPLAIN is
22795 nonzero if this is called from the parser, zero if called recursively,
22796 since the standard is unclear (as detailed below). */
22799 do_type_instantiation (tree t
, tree storage
, tsubst_flags_t complain
)
22804 int previous_instantiation_extern_p
= 0;
22806 if (TREE_CODE (t
) == TYPE_DECL
)
22809 if (! CLASS_TYPE_P (t
) || ! CLASSTYPE_TEMPLATE_INFO (t
))
22812 (TYPE_TEMPLATE_INFO (t
)) ? TYPE_TI_TEMPLATE (t
) : NULL
;
22814 error ("explicit instantiation of non-class template %qD", tmpl
);
22816 error ("explicit instantiation of non-template type %qT", t
);
22822 if (!COMPLETE_TYPE_P (t
))
22824 if (complain
& tf_error
)
22825 error ("explicit instantiation of %q#T before definition of template",
22830 if (storage
!= NULL_TREE
)
22832 if (!in_system_header_at (input_location
))
22834 if (storage
== ridpointers
[(int) RID_EXTERN
])
22836 if (cxx_dialect
== cxx98
)
22837 pedwarn (input_location
, OPT_Wpedantic
,
22838 "ISO C++ 1998 forbids the use of %<extern%> on "
22839 "explicit instantiations");
22842 pedwarn (input_location
, OPT_Wpedantic
,
22843 "ISO C++ forbids the use of %qE"
22844 " on explicit instantiations", storage
);
22847 if (storage
== ridpointers
[(int) RID_INLINE
])
22849 else if (storage
== ridpointers
[(int) RID_EXTERN
])
22851 else if (storage
== ridpointers
[(int) RID_STATIC
])
22855 error ("storage class %qD applied to template instantiation",
22861 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t
))
22863 /* DR 259 [temp.spec].
22865 Both an explicit instantiation and a declaration of an explicit
22866 specialization shall not appear in a program unless the explicit
22867 instantiation follows a declaration of the explicit specialization.
22869 For a given set of template parameters, if an explicit
22870 instantiation of a template appears after a declaration of an
22871 explicit specialization for that template, the explicit
22872 instantiation has no effect. */
22875 else if (CLASSTYPE_EXPLICIT_INSTANTIATION (t
))
22879 No program shall explicitly instantiate any template more
22882 If PREVIOUS_INSTANTIATION_EXTERN_P, then the first explicit
22883 instantiation was `extern'. If EXTERN_P then the second is.
22884 These cases are OK. */
22885 previous_instantiation_extern_p
= CLASSTYPE_INTERFACE_ONLY (t
);
22887 if (!previous_instantiation_extern_p
&& !extern_p
22888 && (complain
& tf_error
))
22889 permerror (input_location
, "duplicate explicit instantiation of %q#T", t
);
22891 /* If we've already instantiated the template, just return now. */
22892 if (!CLASSTYPE_INTERFACE_ONLY (t
))
22896 check_explicit_instantiation_namespace (TYPE_NAME (t
));
22897 mark_class_instantiated (t
, extern_p
);
22902 /* In contrast to implicit instantiation, where only the
22903 declarations, and not the definitions, of members are
22904 instantiated, we have here:
22908 The explicit instantiation of a class template specialization
22909 implies the instantiation of all of its members not
22910 previously explicitly specialized in the translation unit
22911 containing the explicit instantiation.
22913 Of course, we can't instantiate member template classes, since we
22914 don't have any arguments for them. Note that the standard is
22915 unclear on whether the instantiation of the members are
22916 *explicit* instantiations or not. However, the most natural
22917 interpretation is that it should be an explicit
22919 for (tree fld
= TYPE_FIELDS (t
); fld
; fld
= DECL_CHAIN (fld
))
22921 || (TREE_CODE (fld
) == FUNCTION_DECL
22923 && user_provided_p (fld
)))
22924 && DECL_TEMPLATE_INSTANTIATION (fld
))
22926 mark_decl_instantiated (fld
, extern_p
);
22928 instantiate_decl (fld
, /*defer_ok=*/true,
22929 /*expl_inst_class_mem_p=*/true);
22932 if (CLASSTYPE_NESTED_UTDS (t
))
22933 binding_table_foreach (CLASSTYPE_NESTED_UTDS (t
),
22934 bt_instantiate_type_proc
, &storage
);
22937 /* Given a function DECL, which is a specialization of TMPL, modify
22938 DECL to be a re-instantiation of TMPL with the same template
22939 arguments. TMPL should be the template into which tsubst'ing
22940 should occur for DECL, not the most general template.
22942 One reason for doing this is a scenario like this:
22945 void f(const T&, int i);
22947 void g() { f(3, 7); }
22950 void f(const T& t, const int i) { }
22952 Note that when the template is first instantiated, with
22953 instantiate_template, the resulting DECL will have no name for the
22954 first parameter, and the wrong type for the second. So, when we go
22955 to instantiate the DECL, we regenerate it. */
22958 regenerate_decl_from_template (tree decl
, tree tmpl
, tree args
)
22960 /* The arguments used to instantiate DECL, from the most general
22964 code_pattern
= DECL_TEMPLATE_RESULT (tmpl
);
22966 /* Make sure that we can see identifiers, and compute access
22968 push_access_scope (decl
);
22970 if (TREE_CODE (decl
) == FUNCTION_DECL
)
22978 args_depth
= TMPL_ARGS_DEPTH (args
);
22979 parms_depth
= TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (tmpl
));
22980 if (args_depth
> parms_depth
)
22981 args
= get_innermost_template_args (args
, parms_depth
);
22983 specs
= tsubst_exception_specification (TREE_TYPE (code_pattern
),
22984 args
, tf_error
, NULL_TREE
,
22985 /*defer_ok*/false);
22986 if (specs
&& specs
!= error_mark_node
)
22987 TREE_TYPE (decl
) = build_exception_variant (TREE_TYPE (decl
),
22990 /* Merge parameter declarations. */
22991 decl_parm
= skip_artificial_parms_for (decl
,
22992 DECL_ARGUMENTS (decl
));
22994 = skip_artificial_parms_for (code_pattern
,
22995 DECL_ARGUMENTS (code_pattern
));
22996 while (decl_parm
&& !DECL_PACK_P (pattern_parm
))
23001 if (DECL_NAME (decl_parm
) != DECL_NAME (pattern_parm
))
23002 DECL_NAME (decl_parm
) = DECL_NAME (pattern_parm
);
23003 parm_type
= tsubst (TREE_TYPE (pattern_parm
), args
, tf_error
,
23005 parm_type
= type_decays_to (parm_type
);
23006 if (!same_type_p (TREE_TYPE (decl_parm
), parm_type
))
23007 TREE_TYPE (decl_parm
) = parm_type
;
23008 attributes
= DECL_ATTRIBUTES (pattern_parm
);
23009 if (DECL_ATTRIBUTES (decl_parm
) != attributes
)
23011 DECL_ATTRIBUTES (decl_parm
) = attributes
;
23012 cplus_decl_attributes (&decl_parm
, attributes
, /*flags=*/0);
23014 decl_parm
= DECL_CHAIN (decl_parm
);
23015 pattern_parm
= DECL_CHAIN (pattern_parm
);
23017 /* Merge any parameters that match with the function parameter
23019 if (pattern_parm
&& DECL_PACK_P (pattern_parm
))
23022 tree expanded_types
;
23023 /* Expand the TYPE_PACK_EXPANSION that provides the types for
23024 the parameters in this function parameter pack. */
23025 expanded_types
= tsubst_pack_expansion (TREE_TYPE (pattern_parm
),
23026 args
, tf_error
, NULL_TREE
);
23027 len
= TREE_VEC_LENGTH (expanded_types
);
23028 for (i
= 0; i
< len
; i
++)
23033 if (DECL_NAME (decl_parm
) != DECL_NAME (pattern_parm
))
23034 /* Rename the parameter to include the index. */
23035 DECL_NAME (decl_parm
) =
23036 make_ith_pack_parameter_name (DECL_NAME (pattern_parm
), i
);
23037 parm_type
= TREE_VEC_ELT (expanded_types
, i
);
23038 parm_type
= type_decays_to (parm_type
);
23039 if (!same_type_p (TREE_TYPE (decl_parm
), parm_type
))
23040 TREE_TYPE (decl_parm
) = parm_type
;
23041 attributes
= DECL_ATTRIBUTES (pattern_parm
);
23042 if (DECL_ATTRIBUTES (decl_parm
) != attributes
)
23044 DECL_ATTRIBUTES (decl_parm
) = attributes
;
23045 cplus_decl_attributes (&decl_parm
, attributes
, /*flags=*/0);
23047 decl_parm
= DECL_CHAIN (decl_parm
);
23050 /* Merge additional specifiers from the CODE_PATTERN. */
23051 if (DECL_DECLARED_INLINE_P (code_pattern
)
23052 && !DECL_DECLARED_INLINE_P (decl
))
23053 DECL_DECLARED_INLINE_P (decl
) = 1;
23055 else if (VAR_P (decl
))
23057 start_lambda_scope (decl
);
23058 DECL_INITIAL (decl
) =
23059 tsubst_expr (DECL_INITIAL (code_pattern
), args
,
23060 tf_error
, DECL_TI_TEMPLATE (decl
),
23061 /*integral_constant_expression_p=*/false);
23062 finish_lambda_scope ();
23063 if (VAR_HAD_UNKNOWN_BOUND (decl
))
23064 TREE_TYPE (decl
) = tsubst (TREE_TYPE (code_pattern
), args
,
23065 tf_error
, DECL_TI_TEMPLATE (decl
));
23068 gcc_unreachable ();
23070 pop_access_scope (decl
);
23073 /* Return the TEMPLATE_DECL into which DECL_TI_ARGS(DECL) should be
23074 substituted to get DECL. */
23077 template_for_substitution (tree decl
)
23079 tree tmpl
= DECL_TI_TEMPLATE (decl
);
23081 /* Set TMPL to the template whose DECL_TEMPLATE_RESULT is the pattern
23082 for the instantiation. This is not always the most general
23083 template. Consider, for example:
23086 struct S { template <class U> void f();
23087 template <> void f<int>(); };
23089 and an instantiation of S<double>::f<int>. We want TD to be the
23090 specialization S<T>::f<int>, not the more general S<T>::f<U>. */
23091 while (/* An instantiation cannot have a definition, so we need a
23092 more general template. */
23093 DECL_TEMPLATE_INSTANTIATION (tmpl
)
23094 /* We must also deal with friend templates. Given:
23096 template <class T> struct S {
23097 template <class U> friend void f() {};
23100 S<int>::f<U> say, is not an instantiation of S<T>::f<U>,
23101 so far as the language is concerned, but that's still
23102 where we get the pattern for the instantiation from. On
23103 other hand, if the definition comes outside the class, say:
23105 template <class T> struct S {
23106 template <class U> friend void f();
23108 template <class U> friend void f() {}
23110 we don't need to look any further. That's what the check for
23111 DECL_INITIAL is for. */
23112 || (TREE_CODE (decl
) == FUNCTION_DECL
23113 && DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (tmpl
)
23114 && !DECL_INITIAL (DECL_TEMPLATE_RESULT (tmpl
))))
23116 /* The present template, TD, should not be a definition. If it
23117 were a definition, we should be using it! Note that we
23118 cannot restructure the loop to just keep going until we find
23119 a template with a definition, since that might go too far if
23120 a specialization was declared, but not defined. */
23122 /* Fetch the more general template. */
23123 tmpl
= DECL_TI_TEMPLATE (tmpl
);
23129 /* Returns true if we need to instantiate this template instance even if we
23130 know we aren't going to emit it. */
23133 always_instantiate_p (tree decl
)
23135 /* We always instantiate inline functions so that we can inline them. An
23136 explicit instantiation declaration prohibits implicit instantiation of
23137 non-inline functions. With high levels of optimization, we would
23138 normally inline non-inline functions -- but we're not allowed to do
23139 that for "extern template" functions. Therefore, we check
23140 DECL_DECLARED_INLINE_P, rather than possibly_inlined_p. */
23141 return ((TREE_CODE (decl
) == FUNCTION_DECL
23142 && (DECL_DECLARED_INLINE_P (decl
)
23143 || type_uses_auto (TREE_TYPE (TREE_TYPE (decl
)))))
23144 /* And we need to instantiate static data members so that
23145 their initializers are available in integral constant
23148 && decl_maybe_constant_var_p (decl
)));
23151 /* If FN has a noexcept-specifier that hasn't been instantiated yet,
23152 instantiate it now, modifying TREE_TYPE (fn). Returns false on
23153 error, true otherwise. */
23156 maybe_instantiate_noexcept (tree fn
, tsubst_flags_t complain
)
23158 tree fntype
, spec
, noex
, clone
;
23160 /* Don't instantiate a noexcept-specification from template context. */
23161 if (processing_template_decl
)
23164 if (DECL_CLONED_FUNCTION_P (fn
))
23165 fn
= DECL_CLONED_FUNCTION (fn
);
23166 fntype
= TREE_TYPE (fn
);
23167 spec
= TYPE_RAISES_EXCEPTIONS (fntype
);
23169 if (!spec
|| !TREE_PURPOSE (spec
))
23172 noex
= TREE_PURPOSE (spec
);
23174 if (TREE_CODE (noex
) == DEFERRED_NOEXCEPT
)
23176 static hash_set
<tree
>* fns
= new hash_set
<tree
>;
23177 bool added
= false;
23178 if (DEFERRED_NOEXCEPT_PATTERN (noex
) == NULL_TREE
)
23179 spec
= get_defaulted_eh_spec (fn
, complain
);
23180 else if (!(added
= !fns
->add (fn
)))
23182 /* If hash_set::add returns true, the element was already there. */
23183 location_t loc
= EXPR_LOC_OR_LOC (DEFERRED_NOEXCEPT_PATTERN (noex
),
23184 DECL_SOURCE_LOCATION (fn
));
23186 "exception specification of %qD depends on itself",
23188 spec
= noexcept_false_spec
;
23190 else if (push_tinst_level (fn
))
23192 push_access_scope (fn
);
23193 push_deferring_access_checks (dk_no_deferred
);
23194 input_location
= DECL_SOURCE_LOCATION (fn
);
23195 noex
= tsubst_copy_and_build (DEFERRED_NOEXCEPT_PATTERN (noex
),
23196 DEFERRED_NOEXCEPT_ARGS (noex
),
23197 tf_warning_or_error
, fn
,
23198 /*function_p=*/false,
23199 /*integral_constant_expression_p=*/true);
23200 pop_deferring_access_checks ();
23201 pop_access_scope (fn
);
23202 pop_tinst_level ();
23203 spec
= build_noexcept_spec (noex
, tf_warning_or_error
);
23204 if (spec
== error_mark_node
)
23205 spec
= noexcept_false_spec
;
23208 spec
= noexcept_false_spec
;
23213 if (spec
== error_mark_node
)
23216 TREE_TYPE (fn
) = build_exception_variant (fntype
, spec
);
23219 FOR_EACH_CLONE (clone
, fn
)
23221 if (TREE_TYPE (clone
) == fntype
)
23222 TREE_TYPE (clone
) = TREE_TYPE (fn
);
23224 TREE_TYPE (clone
) = build_exception_variant (TREE_TYPE (clone
), spec
);
23230 /* We're starting to process the function INST, an instantiation of PATTERN;
23231 add their parameters to local_specializations. */
23234 register_parameter_specializations (tree pattern
, tree inst
)
23236 tree tmpl_parm
= DECL_ARGUMENTS (pattern
);
23237 tree spec_parm
= DECL_ARGUMENTS (inst
);
23238 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (inst
))
23240 register_local_specialization (spec_parm
, tmpl_parm
);
23241 spec_parm
= skip_artificial_parms_for (inst
, spec_parm
);
23242 tmpl_parm
= skip_artificial_parms_for (pattern
, tmpl_parm
);
23244 for (; tmpl_parm
; tmpl_parm
= DECL_CHAIN (tmpl_parm
))
23246 if (!DECL_PACK_P (tmpl_parm
))
23248 register_local_specialization (spec_parm
, tmpl_parm
);
23249 spec_parm
= DECL_CHAIN (spec_parm
);
23253 /* Register the (value) argument pack as a specialization of
23254 TMPL_PARM, then move on. */
23255 tree argpack
= extract_fnparm_pack (tmpl_parm
, &spec_parm
);
23256 register_local_specialization (argpack
, tmpl_parm
);
23259 gcc_assert (!spec_parm
);
23262 /* Produce the definition of D, a _DECL generated from a template. If
23263 DEFER_OK is true, then we don't have to actually do the
23264 instantiation now; we just have to do it sometime. Normally it is
23265 an error if this is an explicit instantiation but D is undefined.
23266 EXPL_INST_CLASS_MEM_P is true iff D is a member of an explicitly
23267 instantiated class template. */
23270 instantiate_decl (tree d
, bool defer_ok
, bool expl_inst_class_mem_p
)
23272 tree tmpl
= DECL_TI_TEMPLATE (d
);
23279 bool pattern_defined
;
23280 location_t saved_loc
= input_location
;
23281 int saved_unevaluated_operand
= cp_unevaluated_operand
;
23282 int saved_inhibit_evaluation_warnings
= c_inhibit_evaluation_warnings
;
23286 /* This function should only be used to instantiate templates for
23287 functions and static member variables. */
23288 gcc_assert (VAR_OR_FUNCTION_DECL_P (d
));
23290 /* A concept is never instantiated. */
23291 gcc_assert (!DECL_DECLARED_CONCEPT_P (d
));
23293 /* Variables are never deferred; if instantiation is required, they
23294 are instantiated right away. That allows for better code in the
23295 case that an expression refers to the value of the variable --
23296 if the variable has a constant value the referring expression can
23297 take advantage of that fact. */
23301 /* Don't instantiate cloned functions. Instead, instantiate the
23302 functions they cloned. */
23303 if (TREE_CODE (d
) == FUNCTION_DECL
&& DECL_CLONED_FUNCTION_P (d
))
23304 d
= DECL_CLONED_FUNCTION (d
);
23306 if (DECL_TEMPLATE_INSTANTIATED (d
)
23307 || (TREE_CODE (d
) == FUNCTION_DECL
23308 && DECL_DEFAULTED_FN (d
) && DECL_INITIAL (d
))
23309 || DECL_TEMPLATE_SPECIALIZATION (d
))
23310 /* D has already been instantiated or explicitly specialized, so
23311 there's nothing for us to do here.
23313 It might seem reasonable to check whether or not D is an explicit
23314 instantiation, and, if so, stop here. But when an explicit
23315 instantiation is deferred until the end of the compilation,
23316 DECL_EXPLICIT_INSTANTIATION is set, even though we still need to do
23317 the instantiation. */
23320 /* Check to see whether we know that this template will be
23321 instantiated in some other file, as with "extern template"
23323 external_p
= (DECL_INTERFACE_KNOWN (d
) && DECL_REALLY_EXTERN (d
));
23325 /* In general, we do not instantiate such templates. */
23326 if (external_p
&& !always_instantiate_p (d
))
23329 gen_tmpl
= most_general_template (tmpl
);
23330 gen_args
= DECL_TI_ARGS (d
);
23332 if (tmpl
!= gen_tmpl
)
23333 /* We should already have the extra args. */
23334 gcc_assert (TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (gen_tmpl
))
23335 == TMPL_ARGS_DEPTH (gen_args
));
23336 /* And what's in the hash table should match D. */
23337 gcc_assert ((spec
= retrieve_specialization (gen_tmpl
, gen_args
, 0)) == d
23338 || spec
== NULL_TREE
);
23340 /* This needs to happen before any tsubsting. */
23341 if (! push_tinst_level (d
))
23344 timevar_push (TV_TEMPLATE_INST
);
23346 /* Set TD to the template whose DECL_TEMPLATE_RESULT is the pattern
23347 for the instantiation. */
23348 td
= template_for_substitution (d
);
23353 /* Look up an explicit specialization, if any. */
23354 tree tid
= lookup_template_variable (gen_tmpl
, gen_args
);
23355 tree elt
= most_specialized_partial_spec (tid
, tf_warning_or_error
);
23356 if (elt
&& elt
!= error_mark_node
)
23358 td
= TREE_VALUE (elt
);
23359 args
= TREE_PURPOSE (elt
);
23363 code_pattern
= DECL_TEMPLATE_RESULT (td
);
23365 /* We should never be trying to instantiate a member of a class
23366 template or partial specialization. */
23367 gcc_assert (d
!= code_pattern
);
23369 if ((DECL_NAMESPACE_SCOPE_P (d
) && !DECL_INITIALIZED_IN_CLASS_P (d
))
23370 || DECL_TEMPLATE_SPECIALIZATION (td
))
23371 /* In the case of a friend template whose definition is provided
23372 outside the class, we may have too many arguments. Drop the
23373 ones we don't need. The same is true for specializations. */
23374 args
= get_innermost_template_args
23375 (args
, TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (td
)));
23377 if (TREE_CODE (d
) == FUNCTION_DECL
)
23379 deleted_p
= DECL_DELETED_FN (code_pattern
);
23380 pattern_defined
= ((DECL_SAVED_TREE (code_pattern
) != NULL_TREE
23381 && DECL_INITIAL (code_pattern
) != error_mark_node
)
23382 || DECL_DEFAULTED_OUTSIDE_CLASS_P (code_pattern
)
23388 if (DECL_CLASS_SCOPE_P (code_pattern
))
23389 pattern_defined
= (! DECL_IN_AGGR_P (code_pattern
)
23390 || DECL_INLINE_VAR_P (code_pattern
));
23392 pattern_defined
= ! DECL_EXTERNAL (code_pattern
);
23395 /* We may be in the middle of deferred access check. Disable it now. */
23396 push_deferring_access_checks (dk_no_deferred
);
23398 /* Unless an explicit instantiation directive has already determined
23399 the linkage of D, remember that a definition is available for
23401 if (pattern_defined
23402 && !DECL_INTERFACE_KNOWN (d
)
23403 && !DECL_NOT_REALLY_EXTERN (d
))
23404 mark_definable (d
);
23406 DECL_SOURCE_LOCATION (td
) = DECL_SOURCE_LOCATION (code_pattern
);
23407 DECL_SOURCE_LOCATION (d
) = DECL_SOURCE_LOCATION (code_pattern
);
23408 input_location
= DECL_SOURCE_LOCATION (d
);
23410 /* If D is a member of an explicitly instantiated class template,
23411 and no definition is available, treat it like an implicit
23413 if (!pattern_defined
&& expl_inst_class_mem_p
23414 && DECL_EXPLICIT_INSTANTIATION (d
))
23416 /* Leave linkage flags alone on instantiations with anonymous
23418 if (TREE_PUBLIC (d
))
23420 DECL_NOT_REALLY_EXTERN (d
) = 0;
23421 DECL_INTERFACE_KNOWN (d
) = 0;
23423 SET_DECL_IMPLICIT_INSTANTIATION (d
);
23426 /* Defer all other templates, unless we have been explicitly
23427 forbidden from doing so. */
23428 if (/* If there is no definition, we cannot instantiate the
23431 /* If it's OK to postpone instantiation, do so. */
23433 /* If this is a static data member that will be defined
23434 elsewhere, we don't want to instantiate the entire data
23435 member, but we do want to instantiate the initializer so that
23436 we can substitute that elsewhere. */
23437 || (external_p
&& VAR_P (d
))
23438 /* Handle here a deleted function too, avoid generating
23439 its body (c++/61080). */
23442 /* The definition of the static data member is now required so
23443 we must substitute the initializer. */
23445 && !DECL_INITIAL (d
)
23446 && DECL_INITIAL (code_pattern
))
23450 bool const_init
= false;
23451 bool enter_context
= DECL_CLASS_SCOPE_P (d
);
23453 ns
= decl_namespace_context (d
);
23454 push_nested_namespace (ns
);
23456 push_nested_class (DECL_CONTEXT (d
));
23457 init
= tsubst_expr (DECL_INITIAL (code_pattern
),
23459 tf_warning_or_error
, NULL_TREE
,
23460 /*integral_constant_expression_p=*/false);
23461 /* If instantiating the initializer involved instantiating this
23462 again, don't call cp_finish_decl twice. */
23463 if (!DECL_INITIAL (d
))
23465 /* Make sure the initializer is still constant, in case of
23466 circular dependency (template/instantiate6.C). */
23468 = DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (code_pattern
);
23469 cp_finish_decl (d
, init
, /*init_const_expr_p=*/const_init
,
23470 /*asmspec_tree=*/NULL_TREE
,
23471 LOOKUP_ONLYCONVERTING
);
23474 pop_nested_class ();
23475 pop_nested_namespace (ns
);
23478 /* We restore the source position here because it's used by
23479 add_pending_template. */
23480 input_location
= saved_loc
;
23482 if (at_eof
&& !pattern_defined
23483 && DECL_EXPLICIT_INSTANTIATION (d
)
23484 && DECL_NOT_REALLY_EXTERN (d
))
23487 The definition of a non-exported function template, a
23488 non-exported member function template, or a non-exported
23489 member function or static data member of a class template
23490 shall be present in every translation unit in which it is
23491 explicitly instantiated. */
23492 permerror (input_location
, "explicit instantiation of %qD "
23493 "but no definition available", d
);
23495 /* If we're in unevaluated context, we just wanted to get the
23496 constant value; this isn't an odr use, so don't queue
23497 a full instantiation. */
23498 if (cp_unevaluated_operand
!= 0)
23500 /* ??? Historically, we have instantiated inline functions, even
23501 when marked as "extern template". */
23502 if (!(external_p
&& VAR_P (d
)))
23503 add_pending_template (d
);
23506 /* Tell the repository that D is available in this translation unit
23507 -- and see if it is supposed to be instantiated here. */
23508 if (TREE_PUBLIC (d
) && !DECL_REALLY_EXTERN (d
) && !repo_emit_p (d
))
23510 /* In a PCH file, despite the fact that the repository hasn't
23511 requested instantiation in the PCH it is still possible that
23512 an instantiation will be required in a file that includes the
23515 add_pending_template (d
);
23516 /* Instantiate inline functions so that the inliner can do its
23517 job, even though we'll not be emitting a copy of this
23519 if (!(TREE_CODE (d
) == FUNCTION_DECL
&& possibly_inlined_p (d
)))
23523 bool push_to_top
, nested
;
23525 fn_context
= decl_function_context (d
);
23526 if (LAMBDA_FUNCTION_P (d
))
23527 /* tsubst_lambda_expr resolved any references to enclosing functions. */
23528 fn_context
= NULL_TREE
;
23529 nested
= current_function_decl
!= NULL_TREE
;
23530 push_to_top
= !(nested
&& fn_context
== current_function_decl
);
23532 vec
<tree
> omp_privatization_save
;
23534 save_omp_privatization_clauses (omp_privatization_save
);
23537 push_to_top_level ();
23540 push_function_context ();
23541 cp_unevaluated_operand
= 0;
23542 c_inhibit_evaluation_warnings
= 0;
23545 /* Mark D as instantiated so that recursive calls to
23546 instantiate_decl do not try to instantiate it again. */
23547 DECL_TEMPLATE_INSTANTIATED (d
) = 1;
23549 /* Regenerate the declaration in case the template has been modified
23550 by a subsequent redeclaration. */
23551 regenerate_decl_from_template (d
, td
, args
);
23553 /* We already set the file and line above. Reset them now in case
23554 they changed as a result of calling regenerate_decl_from_template. */
23555 input_location
= DECL_SOURCE_LOCATION (d
);
23560 bool const_init
= false;
23562 /* Clear out DECL_RTL; whatever was there before may not be right
23563 since we've reset the type of the declaration. */
23564 SET_DECL_RTL (d
, NULL
);
23565 DECL_IN_AGGR_P (d
) = 0;
23567 /* The initializer is placed in DECL_INITIAL by
23568 regenerate_decl_from_template so we don't need to
23569 push/pop_access_scope again here. Pull it out so that
23570 cp_finish_decl can process it. */
23571 init
= DECL_INITIAL (d
);
23572 DECL_INITIAL (d
) = NULL_TREE
;
23573 DECL_INITIALIZED_P (d
) = 0;
23575 /* Clear DECL_EXTERNAL so that cp_finish_decl will process the
23576 initializer. That function will defer actual emission until
23577 we have a chance to determine linkage. */
23578 DECL_EXTERNAL (d
) = 0;
23580 /* Enter the scope of D so that access-checking works correctly. */
23581 bool enter_context
= DECL_CLASS_SCOPE_P (d
);
23583 push_nested_class (DECL_CONTEXT (d
));
23585 const_init
= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (code_pattern
);
23586 cp_finish_decl (d
, init
, const_init
, NULL_TREE
, 0);
23589 pop_nested_class ();
23591 if (variable_template_p (gen_tmpl
))
23592 note_variable_template_instantiation (d
);
23594 else if (TREE_CODE (d
) == FUNCTION_DECL
&& DECL_DEFAULTED_FN (code_pattern
))
23595 synthesize_method (d
);
23596 else if (TREE_CODE (d
) == FUNCTION_DECL
)
23598 /* Set up the list of local specializations. */
23599 local_specialization_stack
lss (push_to_top
? lss_blank
: lss_copy
);
23600 tree block
= NULL_TREE
;
23602 /* Set up context. */
23603 if (DECL_OMP_DECLARE_REDUCTION_P (code_pattern
)
23604 && TREE_CODE (DECL_CONTEXT (code_pattern
)) == FUNCTION_DECL
)
23605 block
= push_stmt_list ();
23607 start_preparsed_function (d
, NULL_TREE
, SF_PRE_PARSED
);
23609 /* Some typedefs referenced from within the template code need to be
23610 access checked at template instantiation time, i.e now. These
23611 types were added to the template at parsing time. Let's get those
23612 and perform the access checks then. */
23613 perform_typedefs_access_check (DECL_TEMPLATE_RESULT (td
),
23616 /* Create substitution entries for the parameters. */
23617 register_parameter_specializations (code_pattern
, d
);
23619 /* Substitute into the body of the function. */
23620 if (DECL_OMP_DECLARE_REDUCTION_P (code_pattern
))
23621 tsubst_omp_udr (DECL_SAVED_TREE (code_pattern
), args
,
23622 tf_warning_or_error
, tmpl
);
23625 tsubst_expr (DECL_SAVED_TREE (code_pattern
), args
,
23626 tf_warning_or_error
, tmpl
,
23627 /*integral_constant_expression_p=*/false);
23629 /* Set the current input_location to the end of the function
23630 so that finish_function knows where we are. */
23632 = DECL_STRUCT_FUNCTION (code_pattern
)->function_end_locus
;
23634 /* Remember if we saw an infinite loop in the template. */
23635 current_function_infinite_loop
23636 = DECL_STRUCT_FUNCTION (code_pattern
)->language
->infinite_loop
;
23639 /* Finish the function. */
23640 if (DECL_OMP_DECLARE_REDUCTION_P (code_pattern
)
23641 && TREE_CODE (DECL_CONTEXT (code_pattern
)) == FUNCTION_DECL
)
23642 DECL_SAVED_TREE (d
) = pop_stmt_list (block
);
23645 d
= finish_function (/*inline_p=*/false);
23646 expand_or_defer_fn (d
);
23649 if (DECL_OMP_DECLARE_REDUCTION_P (code_pattern
))
23650 cp_check_omp_declare_reduction (d
);
23653 /* We're not deferring instantiation any more. */
23654 TI_PENDING_TEMPLATE_FLAG (DECL_TEMPLATE_INFO (d
)) = 0;
23657 pop_from_top_level ();
23659 pop_function_context ();
23662 restore_omp_privatization_clauses (omp_privatization_save
);
23665 pop_deferring_access_checks ();
23666 timevar_pop (TV_TEMPLATE_INST
);
23667 pop_tinst_level ();
23668 input_location
= saved_loc
;
23669 cp_unevaluated_operand
= saved_unevaluated_operand
;
23670 c_inhibit_evaluation_warnings
= saved_inhibit_evaluation_warnings
;
23675 /* Run through the list of templates that we wish we could
23676 instantiate, and instantiate any we can. RETRIES is the
23677 number of times we retry pending template instantiation. */
23680 instantiate_pending_templates (int retries
)
23683 location_t saved_loc
= input_location
;
23685 /* Instantiating templates may trigger vtable generation. This in turn
23686 may require further template instantiations. We place a limit here
23687 to avoid infinite loop. */
23688 if (pending_templates
&& retries
>= max_tinst_depth
)
23690 tree decl
= pending_templates
->tinst
->decl
;
23692 fatal_error (input_location
,
23693 "template instantiation depth exceeds maximum of %d"
23694 " instantiating %q+D, possibly from virtual table generation"
23695 " (use -ftemplate-depth= to increase the maximum)",
23696 max_tinst_depth
, decl
);
23697 if (TREE_CODE (decl
) == FUNCTION_DECL
)
23698 /* Pretend that we defined it. */
23699 DECL_INITIAL (decl
) = error_mark_node
;
23705 struct pending_template
**t
= &pending_templates
;
23706 struct pending_template
*last
= NULL
;
23710 tree instantiation
= reopen_tinst_level ((*t
)->tinst
);
23711 bool complete
= false;
23713 if (TYPE_P (instantiation
))
23715 if (!COMPLETE_TYPE_P (instantiation
))
23717 instantiate_class_template (instantiation
);
23718 if (CLASSTYPE_TEMPLATE_INSTANTIATION (instantiation
))
23719 for (tree fld
= TYPE_FIELDS (instantiation
);
23720 fld
; fld
= TREE_CHAIN (fld
))
23722 || (TREE_CODE (fld
) == FUNCTION_DECL
23723 && !DECL_ARTIFICIAL (fld
)))
23724 && DECL_TEMPLATE_INSTANTIATION (fld
))
23725 instantiate_decl (fld
,
23726 /*defer_ok=*/false,
23727 /*expl_inst_class_mem_p=*/false);
23729 if (COMPLETE_TYPE_P (instantiation
))
23733 complete
= COMPLETE_TYPE_P (instantiation
);
23737 if (!DECL_TEMPLATE_SPECIALIZATION (instantiation
)
23738 && !DECL_TEMPLATE_INSTANTIATED (instantiation
))
23741 = instantiate_decl (instantiation
,
23742 /*defer_ok=*/false,
23743 /*expl_inst_class_mem_p=*/false);
23744 if (DECL_TEMPLATE_INSTANTIATED (instantiation
))
23748 complete
= (DECL_TEMPLATE_SPECIALIZATION (instantiation
)
23749 || DECL_TEMPLATE_INSTANTIATED (instantiation
));
23753 /* If INSTANTIATION has been instantiated, then we don't
23754 need to consider it again in the future. */
23762 current_tinst_level
= NULL
;
23764 last_pending_template
= last
;
23766 while (reconsider
);
23768 input_location
= saved_loc
;
23771 /* Substitute ARGVEC into T, which is a list of initializers for
23772 either base class or a non-static data member. The TREE_PURPOSEs
23773 are DECLs, and the TREE_VALUEs are the initializer values. Used by
23774 instantiate_decl. */
23777 tsubst_initializer_list (tree t
, tree argvec
)
23779 tree inits
= NULL_TREE
;
23780 tree target_ctor
= error_mark_node
;
23782 for (; t
; t
= TREE_CHAIN (t
))
23786 tree expanded_bases
= NULL_TREE
;
23787 tree expanded_arguments
= NULL_TREE
;
23790 if (TREE_CODE (TREE_PURPOSE (t
)) == TYPE_PACK_EXPANSION
)
23795 /* Expand the base class expansion type into separate base
23797 expanded_bases
= tsubst_pack_expansion (TREE_PURPOSE (t
), argvec
,
23798 tf_warning_or_error
,
23800 if (expanded_bases
== error_mark_node
)
23803 /* We'll be building separate TREE_LISTs of arguments for
23805 len
= TREE_VEC_LENGTH (expanded_bases
);
23806 expanded_arguments
= make_tree_vec (len
);
23807 for (i
= 0; i
< len
; i
++)
23808 TREE_VEC_ELT (expanded_arguments
, i
) = NULL_TREE
;
23810 /* Build a dummy EXPR_PACK_EXPANSION that will be used to
23811 expand each argument in the TREE_VALUE of t. */
23812 expr
= make_node (EXPR_PACK_EXPANSION
);
23813 PACK_EXPANSION_LOCAL_P (expr
) = true;
23814 PACK_EXPANSION_PARAMETER_PACKS (expr
) =
23815 PACK_EXPANSION_PARAMETER_PACKS (TREE_PURPOSE (t
));
23817 if (TREE_VALUE (t
) == void_type_node
)
23818 /* VOID_TYPE_NODE is used to indicate
23819 value-initialization. */
23821 for (i
= 0; i
< len
; i
++)
23822 TREE_VEC_ELT (expanded_arguments
, i
) = void_type_node
;
23826 /* Substitute parameter packs into each argument in the
23828 in_base_initializer
= 1;
23829 for (arg
= TREE_VALUE (t
); arg
; arg
= TREE_CHAIN (arg
))
23831 tree expanded_exprs
;
23833 /* Expand the argument. */
23834 SET_PACK_EXPANSION_PATTERN (expr
, TREE_VALUE (arg
));
23836 = tsubst_pack_expansion (expr
, argvec
,
23837 tf_warning_or_error
,
23839 if (expanded_exprs
== error_mark_node
)
23842 /* Prepend each of the expanded expressions to the
23843 corresponding TREE_LIST in EXPANDED_ARGUMENTS. */
23844 for (i
= 0; i
< len
; i
++)
23846 TREE_VEC_ELT (expanded_arguments
, i
) =
23847 tree_cons (NULL_TREE
,
23848 TREE_VEC_ELT (expanded_exprs
, i
),
23849 TREE_VEC_ELT (expanded_arguments
, i
));
23852 in_base_initializer
= 0;
23854 /* Reverse all of the TREE_LISTs in EXPANDED_ARGUMENTS,
23855 since we built them backwards. */
23856 for (i
= 0; i
< len
; i
++)
23858 TREE_VEC_ELT (expanded_arguments
, i
) =
23859 nreverse (TREE_VEC_ELT (expanded_arguments
, i
));
23864 for (i
= 0; i
< len
; ++i
)
23866 if (expanded_bases
)
23868 decl
= TREE_VEC_ELT (expanded_bases
, i
);
23869 decl
= expand_member_init (decl
);
23870 init
= TREE_VEC_ELT (expanded_arguments
, i
);
23875 decl
= tsubst_copy (TREE_PURPOSE (t
), argvec
,
23876 tf_warning_or_error
, NULL_TREE
);
23878 decl
= expand_member_init (decl
);
23879 if (decl
&& !DECL_P (decl
))
23880 in_base_initializer
= 1;
23882 init
= TREE_VALUE (t
);
23884 if (init
!= void_type_node
)
23885 init
= tsubst_expr (init
, argvec
,
23886 tf_warning_or_error
, NULL_TREE
,
23887 /*integral_constant_expression_p=*/false);
23888 if (init
== NULL_TREE
&& tmp
!= NULL_TREE
)
23889 /* If we had an initializer but it instantiated to nothing,
23890 value-initialize the object. This will only occur when
23891 the initializer was a pack expansion where the parameter
23892 packs used in that expansion were of length zero. */
23893 init
= void_type_node
;
23894 in_base_initializer
= 0;
23897 if (target_ctor
!= error_mark_node
23898 && init
!= error_mark_node
)
23900 error ("mem-initializer for %qD follows constructor delegation",
23904 /* Look for a target constructor. */
23905 if (init
!= error_mark_node
23906 && decl
&& CLASS_TYPE_P (decl
)
23907 && same_type_p (decl
, current_class_type
))
23909 maybe_warn_cpp0x (CPP0X_DELEGATING_CTORS
);
23912 error ("constructor delegation follows mem-initializer for %qD",
23913 TREE_PURPOSE (inits
));
23916 target_ctor
= init
;
23921 init
= build_tree_list (decl
, init
);
23922 TREE_CHAIN (init
) = inits
;
23930 /* Set CURRENT_ACCESS_SPECIFIER based on the protection of DECL. */
23933 set_current_access_from_decl (tree decl
)
23935 if (TREE_PRIVATE (decl
))
23936 current_access_specifier
= access_private_node
;
23937 else if (TREE_PROTECTED (decl
))
23938 current_access_specifier
= access_protected_node
;
23940 current_access_specifier
= access_public_node
;
23943 /* Instantiate an enumerated type. TAG is the template type, NEWTAG
23944 is the instantiation (which should have been created with
23945 start_enum) and ARGS are the template arguments to use. */
23948 tsubst_enum (tree tag
, tree newtag
, tree args
)
23952 if (SCOPED_ENUM_P (newtag
))
23953 begin_scope (sk_scoped_enum
, newtag
);
23955 for (e
= TYPE_VALUES (tag
); e
; e
= TREE_CHAIN (e
))
23960 decl
= TREE_VALUE (e
);
23961 /* Note that in a template enum, the TREE_VALUE is the
23962 CONST_DECL, not the corresponding INTEGER_CST. */
23963 value
= tsubst_expr (DECL_INITIAL (decl
),
23964 args
, tf_warning_or_error
, NULL_TREE
,
23965 /*integral_constant_expression_p=*/true);
23967 /* Give this enumeration constant the correct access. */
23968 set_current_access_from_decl (decl
);
23970 /* Actually build the enumerator itself. Here we're assuming that
23971 enumerators can't have dependent attributes. */
23972 build_enumerator (DECL_NAME (decl
), value
, newtag
,
23973 DECL_ATTRIBUTES (decl
), DECL_SOURCE_LOCATION (decl
));
23976 if (SCOPED_ENUM_P (newtag
))
23979 finish_enum_value_list (newtag
);
23980 finish_enum (newtag
);
23982 DECL_SOURCE_LOCATION (TYPE_NAME (newtag
))
23983 = DECL_SOURCE_LOCATION (TYPE_NAME (tag
));
23986 /* DECL is a FUNCTION_DECL that is a template specialization. Return
23987 its type -- but without substituting the innermost set of template
23988 arguments. So, innermost set of template parameters will appear in
23992 get_mostly_instantiated_function_type (tree decl
)
23994 /* For a function, DECL_TI_TEMPLATE is partially instantiated. */
23995 return TREE_TYPE (DECL_TI_TEMPLATE (decl
));
23998 /* Return truthvalue if we're processing a template different from
23999 the last one involved in diagnostics. */
24001 problematic_instantiation_changed (void)
24003 return current_tinst_level
!= last_error_tinst_level
;
24006 /* Remember current template involved in diagnostics. */
24008 record_last_problematic_instantiation (void)
24010 last_error_tinst_level
= current_tinst_level
;
24013 struct tinst_level
*
24014 current_instantiation (void)
24016 return current_tinst_level
;
24019 /* Return TRUE if current_function_decl is being instantiated, false
24023 instantiating_current_function_p (void)
24025 return (current_instantiation ()
24026 && current_instantiation ()->decl
== current_function_decl
);
24029 /* [temp.param] Check that template non-type parm TYPE is of an allowable
24030 type. Return false for ok, true for disallowed. Issue error and
24031 inform messages under control of COMPLAIN. */
24034 invalid_nontype_parm_type_p (tree type
, tsubst_flags_t complain
)
24036 if (INTEGRAL_OR_ENUMERATION_TYPE_P (type
))
24038 else if (TYPE_PTR_P (type
))
24040 else if (TREE_CODE (type
) == REFERENCE_TYPE
24041 && !TYPE_REF_IS_RVALUE (type
))
24043 else if (TYPE_PTRMEM_P (type
))
24045 else if (TREE_CODE (type
) == TEMPLATE_TYPE_PARM
)
24047 else if (TREE_CODE (type
) == TYPENAME_TYPE
)
24049 else if (TREE_CODE (type
) == DECLTYPE_TYPE
)
24051 else if (TREE_CODE (type
) == NULLPTR_TYPE
)
24053 /* A bound template template parm could later be instantiated to have a valid
24054 nontype parm type via an alias template. */
24055 else if (cxx_dialect
>= cxx11
24056 && TREE_CODE (type
) == BOUND_TEMPLATE_TEMPLATE_PARM
)
24059 if (complain
& tf_error
)
24061 if (type
== error_mark_node
)
24062 inform (input_location
, "invalid template non-type parameter");
24064 error ("%q#T is not a valid type for a template non-type parameter",
24070 /* Returns TRUE if TYPE is dependent, in the sense of [temp.dep.type].
24071 Assumes that TYPE really is a type, and not the ERROR_MARK_NODE.*/
24074 dependent_type_p_r (tree type
)
24080 A type is dependent if it is:
24082 -- a template parameter. Template template parameters are types
24083 for us (since TYPE_P holds true for them) so we handle
24085 if (TREE_CODE (type
) == TEMPLATE_TYPE_PARM
24086 || TREE_CODE (type
) == TEMPLATE_TEMPLATE_PARM
)
24088 /* -- a qualified-id with a nested-name-specifier which contains a
24089 class-name that names a dependent type or whose unqualified-id
24090 names a dependent type. */
24091 if (TREE_CODE (type
) == TYPENAME_TYPE
)
24094 /* An alias template specialization can be dependent even if the
24095 resulting type is not. */
24096 if (dependent_alias_template_spec_p (type
))
24099 /* -- a cv-qualified type where the cv-unqualified type is
24101 No code is necessary for this bullet; the code below handles
24102 cv-qualified types, and we don't want to strip aliases with
24103 TYPE_MAIN_VARIANT because of DR 1558. */
24104 /* -- a compound type constructed from any dependent type. */
24105 if (TYPE_PTRMEM_P (type
))
24106 return (dependent_type_p (TYPE_PTRMEM_CLASS_TYPE (type
))
24107 || dependent_type_p (TYPE_PTRMEM_POINTED_TO_TYPE
24109 else if (TYPE_PTR_P (type
)
24110 || TREE_CODE (type
) == REFERENCE_TYPE
)
24111 return dependent_type_p (TREE_TYPE (type
));
24112 else if (TREE_CODE (type
) == FUNCTION_TYPE
24113 || TREE_CODE (type
) == METHOD_TYPE
)
24117 if (dependent_type_p (TREE_TYPE (type
)))
24119 for (arg_type
= TYPE_ARG_TYPES (type
);
24121 arg_type
= TREE_CHAIN (arg_type
))
24122 if (dependent_type_p (TREE_VALUE (arg_type
)))
24124 if (cxx_dialect
>= cxx17
)
24125 /* A value-dependent noexcept-specifier makes the type dependent. */
24126 if (tree spec
= TYPE_RAISES_EXCEPTIONS (type
))
24127 if (tree noex
= TREE_PURPOSE (spec
))
24128 /* Treat DEFERRED_NOEXCEPT as non-dependent, since it doesn't
24129 affect overload resolution and treating it as dependent breaks
24131 if (TREE_CODE (noex
) != DEFERRED_NOEXCEPT
24132 && value_dependent_expression_p (noex
))
24136 /* -- an array type constructed from any dependent type or whose
24137 size is specified by a constant expression that is
24140 We checked for type- and value-dependence of the bounds in
24141 compute_array_index_type, so TYPE_DEPENDENT_P is already set. */
24142 if (TREE_CODE (type
) == ARRAY_TYPE
)
24144 if (TYPE_DOMAIN (type
)
24145 && dependent_type_p (TYPE_DOMAIN (type
)))
24147 return dependent_type_p (TREE_TYPE (type
));
24150 /* -- a template-id in which either the template name is a template
24152 if (TREE_CODE (type
) == BOUND_TEMPLATE_TEMPLATE_PARM
)
24154 /* ... or any of the template arguments is a dependent type or
24155 an expression that is type-dependent or value-dependent. */
24156 else if (CLASS_TYPE_P (type
) && CLASSTYPE_TEMPLATE_INFO (type
)
24157 && (any_dependent_template_arguments_p
24158 (INNERMOST_TEMPLATE_ARGS (CLASSTYPE_TI_ARGS (type
)))))
24161 /* All TYPEOF_TYPEs, DECLTYPE_TYPEs, and UNDERLYING_TYPEs are
24162 dependent; if the argument of the `typeof' expression is not
24163 type-dependent, then it should already been have resolved. */
24164 if (TREE_CODE (type
) == TYPEOF_TYPE
24165 || TREE_CODE (type
) == DECLTYPE_TYPE
24166 || TREE_CODE (type
) == UNDERLYING_TYPE
)
24169 /* A template argument pack is dependent if any of its packed
24171 if (TREE_CODE (type
) == TYPE_ARGUMENT_PACK
)
24173 tree args
= ARGUMENT_PACK_ARGS (type
);
24174 int i
, len
= TREE_VEC_LENGTH (args
);
24175 for (i
= 0; i
< len
; ++i
)
24176 if (dependent_template_arg_p (TREE_VEC_ELT (args
, i
)))
24180 /* All TYPE_PACK_EXPANSIONs are dependent, because parameter packs must
24181 be template parameters. */
24182 if (TREE_CODE (type
) == TYPE_PACK_EXPANSION
)
24185 if (any_dependent_type_attributes_p (TYPE_ATTRIBUTES (type
)))
24188 /* The standard does not specifically mention types that are local
24189 to template functions or local classes, but they should be
24190 considered dependent too. For example:
24192 template <int I> void f() {
24197 The size of `E' cannot be known until the value of `I' has been
24198 determined. Therefore, `E' must be considered dependent. */
24199 scope
= TYPE_CONTEXT (type
);
24200 if (scope
&& TYPE_P (scope
))
24201 return dependent_type_p (scope
);
24202 /* Don't use type_dependent_expression_p here, as it can lead
24203 to infinite recursion trying to determine whether a lambda
24204 nested in a lambda is dependent (c++/47687). */
24205 else if (scope
&& TREE_CODE (scope
) == FUNCTION_DECL
24206 && DECL_LANG_SPECIFIC (scope
)
24207 && DECL_TEMPLATE_INFO (scope
)
24208 && (any_dependent_template_arguments_p
24209 (INNERMOST_TEMPLATE_ARGS (DECL_TI_ARGS (scope
)))))
24212 /* Other types are non-dependent. */
24216 /* Returns TRUE if TYPE is dependent, in the sense of
24217 [temp.dep.type]. Note that a NULL type is considered dependent. */
24220 dependent_type_p (tree type
)
24222 /* If there are no template parameters in scope, then there can't be
24223 any dependent types. */
24224 if (!processing_template_decl
)
24226 /* If we are not processing a template, then nobody should be
24227 providing us with a dependent type. */
24229 gcc_assert (TREE_CODE (type
) != TEMPLATE_TYPE_PARM
|| is_auto (type
));
24233 /* If the type is NULL, we have not computed a type for the entity
24234 in question; in that case, the type is dependent. */
24238 /* Erroneous types can be considered non-dependent. */
24239 if (type
== error_mark_node
)
24242 /* Getting here with global_type_node means we improperly called this
24243 function on the TREE_TYPE of an IDENTIFIER_NODE. */
24244 gcc_checking_assert (type
!= global_type_node
);
24246 /* If we have not already computed the appropriate value for TYPE,
24248 if (!TYPE_DEPENDENT_P_VALID (type
))
24250 TYPE_DEPENDENT_P (type
) = dependent_type_p_r (type
);
24251 TYPE_DEPENDENT_P_VALID (type
) = 1;
24254 return TYPE_DEPENDENT_P (type
);
24257 /* Returns TRUE if SCOPE is a dependent scope, in which we can't do any
24258 lookup. In other words, a dependent type that is not the current
24262 dependent_scope_p (tree scope
)
24264 return (scope
&& TYPE_P (scope
) && dependent_type_p (scope
)
24265 && !currently_open_class (scope
));
24268 /* T is a SCOPE_REF. Return whether it represents a non-static member of
24269 an unknown base of 'this' (and is therefore instantiation-dependent). */
24272 unknown_base_ref_p (tree t
)
24274 if (!current_class_ptr
)
24277 tree mem
= TREE_OPERAND (t
, 1);
24278 if (shared_member_p (mem
))
24281 tree cur
= current_nonlambda_class_type ();
24282 if (!any_dependent_bases_p (cur
))
24285 tree ctx
= TREE_OPERAND (t
, 0);
24286 if (DERIVED_FROM_P (ctx
, cur
))
24292 /* T is a SCOPE_REF; return whether we need to consider it
24293 instantiation-dependent so that we can check access at instantiation
24294 time even though we know which member it resolves to. */
24297 instantiation_dependent_scope_ref_p (tree t
)
24299 if (DECL_P (TREE_OPERAND (t
, 1))
24300 && CLASS_TYPE_P (TREE_OPERAND (t
, 0))
24301 && !unknown_base_ref_p (t
)
24302 && accessible_in_template_p (TREE_OPERAND (t
, 0),
24303 TREE_OPERAND (t
, 1)))
24309 /* Returns TRUE if the EXPRESSION is value-dependent, in the sense of
24310 [temp.dep.constexpr]. EXPRESSION is already known to be a constant
24313 /* Note that this predicate is not appropriate for general expressions;
24314 only constant expressions (that satisfy potential_constant_expression)
24315 can be tested for value dependence. */
24318 value_dependent_expression_p (tree expression
)
24320 if (!processing_template_decl
|| expression
== NULL_TREE
)
24323 /* A type-dependent expression is also value-dependent. */
24324 if (type_dependent_expression_p (expression
))
24327 switch (TREE_CODE (expression
))
24330 /* A dependent member function of the current instantiation. */
24331 return dependent_type_p (BINFO_TYPE (BASELINK_BINFO (expression
)));
24333 case FUNCTION_DECL
:
24334 /* A dependent member function of the current instantiation. */
24335 if (DECL_CLASS_SCOPE_P (expression
)
24336 && dependent_type_p (DECL_CONTEXT (expression
)))
24340 case IDENTIFIER_NODE
:
24341 /* A name that has not been looked up -- must be dependent. */
24344 case TEMPLATE_PARM_INDEX
:
24345 /* A non-type template parm. */
24349 /* A non-type template parm. */
24350 if (DECL_TEMPLATE_PARM_P (expression
))
24352 return value_dependent_expression_p (DECL_INITIAL (expression
));
24355 /* A constant with literal type and is initialized
24356 with an expression that is value-dependent. */
24357 if (DECL_DEPENDENT_INIT_P (expression
)
24358 /* FIXME cp_finish_decl doesn't fold reference initializers. */
24359 || TREE_CODE (TREE_TYPE (expression
)) == REFERENCE_TYPE
)
24361 if (DECL_HAS_VALUE_EXPR_P (expression
))
24363 tree value_expr
= DECL_VALUE_EXPR (expression
);
24364 if (value_dependent_expression_p (value_expr
))
24369 case DYNAMIC_CAST_EXPR
:
24370 case STATIC_CAST_EXPR
:
24371 case CONST_CAST_EXPR
:
24372 case REINTERPRET_CAST_EXPR
:
24374 case IMPLICIT_CONV_EXPR
:
24375 /* These expressions are value-dependent if the type to which
24376 the cast occurs is dependent or the expression being casted
24377 is value-dependent. */
24379 tree type
= TREE_TYPE (expression
);
24381 if (dependent_type_p (type
))
24384 /* A functional cast has a list of operands. */
24385 expression
= TREE_OPERAND (expression
, 0);
24388 /* If there are no operands, it must be an expression such
24389 as "int()". This should not happen for aggregate types
24390 because it would form non-constant expressions. */
24391 gcc_assert (cxx_dialect
>= cxx11
24392 || INTEGRAL_OR_ENUMERATION_TYPE_P (type
));
24397 if (TREE_CODE (expression
) == TREE_LIST
)
24398 return any_value_dependent_elements_p (expression
);
24400 return value_dependent_expression_p (expression
);
24404 if (SIZEOF_EXPR_TYPE_P (expression
))
24405 return dependent_type_p (TREE_TYPE (TREE_OPERAND (expression
, 0)));
24409 /* A `sizeof' expression is value-dependent if the operand is
24410 type-dependent or is a pack expansion. */
24411 expression
= TREE_OPERAND (expression
, 0);
24412 if (PACK_EXPANSION_P (expression
))
24414 else if (TYPE_P (expression
))
24415 return dependent_type_p (expression
);
24416 return instantiation_dependent_uneval_expression_p (expression
);
24418 case AT_ENCODE_EXPR
:
24419 /* An 'encode' expression is value-dependent if the operand is
24421 expression
= TREE_OPERAND (expression
, 0);
24422 return dependent_type_p (expression
);
24424 case NOEXCEPT_EXPR
:
24425 expression
= TREE_OPERAND (expression
, 0);
24426 return instantiation_dependent_uneval_expression_p (expression
);
24429 /* All instantiation-dependent expressions should also be considered
24430 value-dependent. */
24431 return instantiation_dependent_scope_ref_p (expression
);
24433 case COMPONENT_REF
:
24434 return (value_dependent_expression_p (TREE_OPERAND (expression
, 0))
24435 || value_dependent_expression_p (TREE_OPERAND (expression
, 1)));
24437 case NONTYPE_ARGUMENT_PACK
:
24438 /* A NONTYPE_ARGUMENT_PACK is value-dependent if any packed argument
24439 is value-dependent. */
24441 tree values
= ARGUMENT_PACK_ARGS (expression
);
24442 int i
, len
= TREE_VEC_LENGTH (values
);
24444 for (i
= 0; i
< len
; ++i
)
24445 if (value_dependent_expression_p (TREE_VEC_ELT (values
, i
)))
24453 tree type2
= TRAIT_EXPR_TYPE2 (expression
);
24455 if (dependent_type_p (TRAIT_EXPR_TYPE1 (expression
)))
24461 if (TREE_CODE (type2
) != TREE_LIST
)
24462 return dependent_type_p (type2
);
24464 for (; type2
; type2
= TREE_CHAIN (type2
))
24465 if (dependent_type_p (TREE_VALUE (type2
)))
24472 return ((value_dependent_expression_p (TREE_OPERAND (expression
, 0)))
24473 || (value_dependent_expression_p (TREE_OPERAND (expression
, 2))));
24476 return ((value_dependent_expression_p (TREE_OPERAND (expression
, 0)))
24477 || (value_dependent_expression_p (TREE_OPERAND (expression
, 1))));
24481 tree op
= TREE_OPERAND (expression
, 0);
24482 return (value_dependent_expression_p (op
)
24483 || has_value_dependent_address (op
));
24486 case REQUIRES_EXPR
:
24487 /* Treat all requires-expressions as value-dependent so
24488 we don't try to fold them. */
24492 return dependent_type_p (TREE_OPERAND (expression
, 0));
24496 if (value_dependent_expression_p (CALL_EXPR_FN (expression
)))
24498 tree fn
= get_callee_fndecl (expression
);
24500 nargs
= call_expr_nargs (expression
);
24501 for (i
= 0; i
< nargs
; ++i
)
24503 tree op
= CALL_EXPR_ARG (expression
, i
);
24504 /* In a call to a constexpr member function, look through the
24505 implicit ADDR_EXPR on the object argument so that it doesn't
24506 cause the call to be considered value-dependent. We also
24507 look through it in potential_constant_expression. */
24508 if (i
== 0 && fn
&& DECL_DECLARED_CONSTEXPR_P (fn
)
24509 && DECL_NONSTATIC_MEMBER_FUNCTION_P (fn
)
24510 && TREE_CODE (op
) == ADDR_EXPR
)
24511 op
= TREE_OPERAND (op
, 0);
24512 if (value_dependent_expression_p (op
))
24518 case TEMPLATE_ID_EXPR
:
24519 return variable_concept_p (TREE_OPERAND (expression
, 0));
24525 if (dependent_type_p (TREE_TYPE (expression
)))
24527 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (expression
), ix
, val
)
24528 if (value_dependent_expression_p (val
))
24534 /* Treat a GNU statement expression as dependent to avoid crashing
24535 under instantiate_non_dependent_expr; it can't be constant. */
24539 /* A constant expression is value-dependent if any subexpression is
24540 value-dependent. */
24541 switch (TREE_CODE_CLASS (TREE_CODE (expression
)))
24543 case tcc_reference
:
24545 case tcc_comparison
:
24547 case tcc_expression
:
24550 int i
, len
= cp_tree_operand_length (expression
);
24552 for (i
= 0; i
< len
; i
++)
24554 tree t
= TREE_OPERAND (expression
, i
);
24556 /* In some cases, some of the operands may be missing.
24557 (For example, in the case of PREDECREMENT_EXPR, the
24558 amount to increment by may be missing.) That doesn't
24559 make the expression dependent. */
24560 if (t
&& value_dependent_expression_p (t
))
24571 /* The expression is not value-dependent. */
24575 /* Returns TRUE if the EXPRESSION is type-dependent, in the sense of
24576 [temp.dep.expr]. Note that an expression with no type is
24577 considered dependent. Other parts of the compiler arrange for an
24578 expression with type-dependent subexpressions to have no type, so
24579 this function doesn't have to be fully recursive. */
24582 type_dependent_expression_p (tree expression
)
24584 if (!processing_template_decl
)
24587 if (expression
== NULL_TREE
|| expression
== error_mark_node
)
24590 STRIP_ANY_LOCATION_WRAPPER (expression
);
24592 /* An unresolved name is always dependent. */
24593 if (identifier_p (expression
)
24594 || TREE_CODE (expression
) == USING_DECL
24595 || TREE_CODE (expression
) == WILDCARD_DECL
)
24598 /* A fold expression is type-dependent. */
24599 if (TREE_CODE (expression
) == UNARY_LEFT_FOLD_EXPR
24600 || TREE_CODE (expression
) == UNARY_RIGHT_FOLD_EXPR
24601 || TREE_CODE (expression
) == BINARY_LEFT_FOLD_EXPR
24602 || TREE_CODE (expression
) == BINARY_RIGHT_FOLD_EXPR
)
24605 /* Some expression forms are never type-dependent. */
24606 if (TREE_CODE (expression
) == PSEUDO_DTOR_EXPR
24607 || TREE_CODE (expression
) == SIZEOF_EXPR
24608 || TREE_CODE (expression
) == ALIGNOF_EXPR
24609 || TREE_CODE (expression
) == AT_ENCODE_EXPR
24610 || TREE_CODE (expression
) == NOEXCEPT_EXPR
24611 || TREE_CODE (expression
) == TRAIT_EXPR
24612 || TREE_CODE (expression
) == TYPEID_EXPR
24613 || TREE_CODE (expression
) == DELETE_EXPR
24614 || TREE_CODE (expression
) == VEC_DELETE_EXPR
24615 || TREE_CODE (expression
) == THROW_EXPR
24616 || TREE_CODE (expression
) == REQUIRES_EXPR
)
24619 /* The types of these expressions depends only on the type to which
24620 the cast occurs. */
24621 if (TREE_CODE (expression
) == DYNAMIC_CAST_EXPR
24622 || TREE_CODE (expression
) == STATIC_CAST_EXPR
24623 || TREE_CODE (expression
) == CONST_CAST_EXPR
24624 || TREE_CODE (expression
) == REINTERPRET_CAST_EXPR
24625 || TREE_CODE (expression
) == IMPLICIT_CONV_EXPR
24626 || TREE_CODE (expression
) == CAST_EXPR
)
24627 return dependent_type_p (TREE_TYPE (expression
));
24629 /* The types of these expressions depends only on the type created
24630 by the expression. */
24631 if (TREE_CODE (expression
) == NEW_EXPR
24632 || TREE_CODE (expression
) == VEC_NEW_EXPR
)
24634 /* For NEW_EXPR tree nodes created inside a template, either
24635 the object type itself or a TREE_LIST may appear as the
24637 tree type
= TREE_OPERAND (expression
, 1);
24638 if (TREE_CODE (type
) == TREE_LIST
)
24639 /* This is an array type. We need to check array dimensions
24641 return dependent_type_p (TREE_VALUE (TREE_PURPOSE (type
)))
24642 || value_dependent_expression_p
24643 (TREE_OPERAND (TREE_VALUE (type
), 1));
24645 return dependent_type_p (type
);
24648 if (TREE_CODE (expression
) == SCOPE_REF
)
24650 tree scope
= TREE_OPERAND (expression
, 0);
24651 tree name
= TREE_OPERAND (expression
, 1);
24653 /* 14.6.2.2 [temp.dep.expr]: An id-expression is type-dependent if it
24654 contains an identifier associated by name lookup with one or more
24655 declarations declared with a dependent type, or...a
24656 nested-name-specifier or qualified-id that names a member of an
24657 unknown specialization. */
24658 return (type_dependent_expression_p (name
)
24659 || dependent_scope_p (scope
));
24662 if (TREE_CODE (expression
) == TEMPLATE_DECL
24663 && !DECL_TEMPLATE_TEMPLATE_PARM_P (expression
))
24664 return uses_outer_template_parms (expression
);
24666 if (TREE_CODE (expression
) == STMT_EXPR
)
24667 expression
= stmt_expr_value_expr (expression
);
24669 if (BRACE_ENCLOSED_INITIALIZER_P (expression
))
24674 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (expression
), i
, elt
)
24676 if (type_dependent_expression_p (elt
))
24682 /* A static data member of the current instantiation with incomplete
24683 array type is type-dependent, as the definition and specializations
24684 can have different bounds. */
24685 if (VAR_P (expression
)
24686 && DECL_CLASS_SCOPE_P (expression
)
24687 && dependent_type_p (DECL_CONTEXT (expression
))
24688 && VAR_HAD_UNKNOWN_BOUND (expression
))
24691 /* An array of unknown bound depending on a variadic parameter, eg:
24693 template<typename... Args>
24694 void foo (Args... args)
24696 int arr[] = { args... };
24699 template<int... vals>
24702 int arr[] = { vals... };
24705 If the array has no length and has an initializer, it must be that
24706 we couldn't determine its length in cp_complete_array_type because
24707 it is dependent. */
24708 if (VAR_P (expression
)
24709 && TREE_TYPE (expression
) != NULL_TREE
24710 && TREE_CODE (TREE_TYPE (expression
)) == ARRAY_TYPE
24711 && !TYPE_DOMAIN (TREE_TYPE (expression
))
24712 && DECL_INITIAL (expression
))
24715 /* A function or variable template-id is type-dependent if it has any
24716 dependent template arguments. */
24717 if (VAR_OR_FUNCTION_DECL_P (expression
)
24718 && DECL_LANG_SPECIFIC (expression
)
24719 && DECL_TEMPLATE_INFO (expression
))
24721 /* Consider the innermost template arguments, since those are the ones
24722 that come from the template-id; the template arguments for the
24723 enclosing class do not make it type-dependent unless they are used in
24724 the type of the decl. */
24725 if (PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (expression
))
24726 && (any_dependent_template_arguments_p
24727 (INNERMOST_TEMPLATE_ARGS (DECL_TI_ARGS (expression
)))))
24731 /* Otherwise, if the function decl isn't from a dependent scope, it can't be
24732 type-dependent. Checking this is important for functions with auto return
24733 type, which looks like a dependent type. */
24734 if (TREE_CODE (expression
) == FUNCTION_DECL
24735 && !(DECL_CLASS_SCOPE_P (expression
)
24736 && dependent_type_p (DECL_CONTEXT (expression
)))
24737 && !(DECL_LANG_SPECIFIC (expression
)
24738 && DECL_FRIEND_P (expression
)
24739 && (!DECL_FRIEND_CONTEXT (expression
)
24740 || dependent_type_p (DECL_FRIEND_CONTEXT (expression
))))
24741 && !DECL_LOCAL_FUNCTION_P (expression
))
24743 gcc_assert (!dependent_type_p (TREE_TYPE (expression
))
24744 || undeduced_auto_decl (expression
));
24748 /* Always dependent, on the number of arguments if nothing else. */
24749 if (TREE_CODE (expression
) == EXPR_PACK_EXPANSION
)
24752 if (TREE_TYPE (expression
) == unknown_type_node
)
24754 if (TREE_CODE (expression
) == ADDR_EXPR
)
24755 return type_dependent_expression_p (TREE_OPERAND (expression
, 0));
24756 if (TREE_CODE (expression
) == COMPONENT_REF
24757 || TREE_CODE (expression
) == OFFSET_REF
)
24759 if (type_dependent_expression_p (TREE_OPERAND (expression
, 0)))
24761 expression
= TREE_OPERAND (expression
, 1);
24762 if (identifier_p (expression
))
24765 /* SCOPE_REF with non-null TREE_TYPE is always non-dependent. */
24766 if (TREE_CODE (expression
) == SCOPE_REF
)
24769 if (BASELINK_P (expression
))
24771 if (BASELINK_OPTYPE (expression
)
24772 && dependent_type_p (BASELINK_OPTYPE (expression
)))
24774 expression
= BASELINK_FUNCTIONS (expression
);
24777 if (TREE_CODE (expression
) == TEMPLATE_ID_EXPR
)
24779 if (any_dependent_template_arguments_p
24780 (TREE_OPERAND (expression
, 1)))
24782 expression
= TREE_OPERAND (expression
, 0);
24783 if (identifier_p (expression
))
24787 gcc_assert (TREE_CODE (expression
) == OVERLOAD
24788 || TREE_CODE (expression
) == FUNCTION_DECL
);
24790 for (lkp_iterator
iter (expression
); iter
; ++iter
)
24791 if (type_dependent_expression_p (*iter
))
24797 gcc_assert (TREE_CODE (expression
) != TYPE_DECL
);
24799 /* Dependent type attributes might not have made it from the decl to
24801 if (DECL_P (expression
)
24802 && any_dependent_type_attributes_p (DECL_ATTRIBUTES (expression
)))
24805 return (dependent_type_p (TREE_TYPE (expression
)));
24808 /* [temp.dep.expr]/5: A class member access expression (5.2.5) is
24809 type-dependent if the expression refers to a member of the current
24810 instantiation and the type of the referenced member is dependent, or the
24811 class member access expression refers to a member of an unknown
24814 This function returns true if the OBJECT in such a class member access
24815 expression is of an unknown specialization. */
24818 type_dependent_object_expression_p (tree object
)
24820 /* An IDENTIFIER_NODE can sometimes have a TREE_TYPE, but it's still
24822 if (TREE_CODE (object
) == IDENTIFIER_NODE
)
24824 tree scope
= TREE_TYPE (object
);
24825 return (!scope
|| dependent_scope_p (scope
));
24828 /* walk_tree callback function for instantiation_dependent_expression_p,
24829 below. Returns non-zero if a dependent subexpression is found. */
24832 instantiation_dependent_r (tree
*tp
, int *walk_subtrees
,
24837 /* We don't have to worry about decltype currently because decltype
24838 of an instantiation-dependent expr is a dependent type. This
24839 might change depending on the resolution of DR 1172. */
24840 *walk_subtrees
= false;
24843 enum tree_code code
= TREE_CODE (*tp
);
24846 /* Don't treat an argument list as dependent just because it has no
24852 case TEMPLATE_PARM_INDEX
:
24855 /* Handle expressions with type operands. */
24859 case AT_ENCODE_EXPR
:
24861 tree op
= TREE_OPERAND (*tp
, 0);
24862 if (code
== SIZEOF_EXPR
&& SIZEOF_EXPR_TYPE_P (*tp
))
24863 op
= TREE_TYPE (op
);
24866 if (dependent_type_p (op
))
24870 *walk_subtrees
= false;
24877 case COMPONENT_REF
:
24878 if (identifier_p (TREE_OPERAND (*tp
, 1)))
24879 /* In a template, finish_class_member_access_expr creates a
24880 COMPONENT_REF with an IDENTIFIER_NODE for op1 even if it isn't
24881 type-dependent, so that we can check access control at
24882 instantiation time (PR 42277). See also Core issue 1273. */
24887 if (instantiation_dependent_scope_ref_p (*tp
))
24892 /* Treat statement-expressions as dependent. */
24896 /* Treat requires-expressions as dependent. */
24897 case REQUIRES_EXPR
:
24901 /* Treat calls to function concepts as dependent. */
24902 if (function_concept_check_p (*tp
))
24906 case TEMPLATE_ID_EXPR
:
24907 /* And variable concepts. */
24908 if (variable_concept_p (TREE_OPERAND (*tp
, 0)))
24916 if (type_dependent_expression_p (*tp
))
24922 /* Returns TRUE if the EXPRESSION is instantiation-dependent, in the
24923 sense defined by the ABI:
24925 "An expression is instantiation-dependent if it is type-dependent
24926 or value-dependent, or it has a subexpression that is type-dependent
24927 or value-dependent."
24929 Except don't actually check value-dependence for unevaluated expressions,
24930 because in sizeof(i) we don't care about the value of i. Checking
24931 type-dependence will in turn check value-dependence of array bounds/template
24932 arguments as needed. */
24935 instantiation_dependent_uneval_expression_p (tree expression
)
24939 if (!processing_template_decl
)
24942 if (expression
== error_mark_node
)
24945 result
= cp_walk_tree_without_duplicates (&expression
,
24946 instantiation_dependent_r
, NULL
);
24947 return result
!= NULL_TREE
;
24950 /* As above, but also check value-dependence of the expression as a whole. */
24953 instantiation_dependent_expression_p (tree expression
)
24955 return (instantiation_dependent_uneval_expression_p (expression
)
24956 || value_dependent_expression_p (expression
));
24959 /* Like type_dependent_expression_p, but it also works while not processing
24960 a template definition, i.e. during substitution or mangling. */
24963 type_dependent_expression_p_push (tree expr
)
24966 ++processing_template_decl
;
24967 b
= type_dependent_expression_p (expr
);
24968 --processing_template_decl
;
24972 /* Returns TRUE if ARGS contains a type-dependent expression. */
24975 any_type_dependent_arguments_p (const vec
<tree
, va_gc
> *args
)
24980 FOR_EACH_VEC_SAFE_ELT (args
, i
, arg
)
24982 if (type_dependent_expression_p (arg
))
24988 /* Returns TRUE if LIST (a TREE_LIST whose TREE_VALUEs are
24989 expressions) contains any type-dependent expressions. */
24992 any_type_dependent_elements_p (const_tree list
)
24994 for (; list
; list
= TREE_CHAIN (list
))
24995 if (type_dependent_expression_p (TREE_VALUE (list
)))
25001 /* Returns TRUE if LIST (a TREE_LIST whose TREE_VALUEs are
25002 expressions) contains any value-dependent expressions. */
25005 any_value_dependent_elements_p (const_tree list
)
25007 for (; list
; list
= TREE_CHAIN (list
))
25008 if (value_dependent_expression_p (TREE_VALUE (list
)))
25014 /* Returns TRUE if the ARG (a template argument) is dependent. */
25017 dependent_template_arg_p (tree arg
)
25019 if (!processing_template_decl
)
25022 /* Assume a template argument that was wrongly written by the user
25023 is dependent. This is consistent with what
25024 any_dependent_template_arguments_p [that calls this function]
25026 if (!arg
|| arg
== error_mark_node
)
25029 if (TREE_CODE (arg
) == ARGUMENT_PACK_SELECT
)
25030 arg
= argument_pack_select_arg (arg
);
25032 if (TREE_CODE (arg
) == TEMPLATE_TEMPLATE_PARM
)
25034 if (TREE_CODE (arg
) == TEMPLATE_DECL
)
25036 if (DECL_TEMPLATE_PARM_P (arg
))
25038 /* A member template of a dependent class is not necessarily
25039 type-dependent, but it is a dependent template argument because it
25040 will be a member of an unknown specialization to that template. */
25041 tree scope
= CP_DECL_CONTEXT (arg
);
25042 return TYPE_P (scope
) && dependent_type_p (scope
);
25044 else if (ARGUMENT_PACK_P (arg
))
25046 tree args
= ARGUMENT_PACK_ARGS (arg
);
25047 int i
, len
= TREE_VEC_LENGTH (args
);
25048 for (i
= 0; i
< len
; ++i
)
25050 if (dependent_template_arg_p (TREE_VEC_ELT (args
, i
)))
25056 else if (TYPE_P (arg
))
25057 return dependent_type_p (arg
);
25059 return (type_dependent_expression_p (arg
)
25060 || value_dependent_expression_p (arg
));
25063 /* Returns true if ARGS (a collection of template arguments) contains
25064 any types that require structural equality testing. */
25067 any_template_arguments_need_structural_equality_p (tree args
)
25074 if (args
== error_mark_node
)
25077 for (i
= 0; i
< TMPL_ARGS_DEPTH (args
); ++i
)
25079 tree level
= TMPL_ARGS_LEVEL (args
, i
+ 1);
25080 for (j
= 0; j
< TREE_VEC_LENGTH (level
); ++j
)
25082 tree arg
= TREE_VEC_ELT (level
, j
);
25083 tree packed_args
= NULL_TREE
;
25086 if (ARGUMENT_PACK_P (arg
))
25088 /* Look inside the argument pack. */
25089 packed_args
= ARGUMENT_PACK_ARGS (arg
);
25090 len
= TREE_VEC_LENGTH (packed_args
);
25093 for (k
= 0; k
< len
; ++k
)
25096 arg
= TREE_VEC_ELT (packed_args
, k
);
25098 if (error_operand_p (arg
))
25100 else if (TREE_CODE (arg
) == TEMPLATE_DECL
)
25102 else if (TYPE_P (arg
) && TYPE_STRUCTURAL_EQUALITY_P (arg
))
25104 else if (!TYPE_P (arg
) && TREE_TYPE (arg
)
25105 && TYPE_STRUCTURAL_EQUALITY_P (TREE_TYPE (arg
)))
25114 /* Returns true if ARGS (a collection of template arguments) contains
25115 any dependent arguments. */
25118 any_dependent_template_arguments_p (const_tree args
)
25125 if (args
== error_mark_node
)
25128 for (i
= 0; i
< TMPL_ARGS_DEPTH (args
); ++i
)
25130 const_tree level
= TMPL_ARGS_LEVEL (args
, i
+ 1);
25131 for (j
= 0; j
< TREE_VEC_LENGTH (level
); ++j
)
25132 if (dependent_template_arg_p (TREE_VEC_ELT (level
, j
)))
25139 /* Returns true if ARGS contains any errors. */
25142 any_erroneous_template_args_p (const_tree args
)
25147 if (args
== error_mark_node
)
25150 if (args
&& TREE_CODE (args
) != TREE_VEC
)
25152 if (tree ti
= get_template_info (args
))
25153 args
= TI_ARGS (ti
);
25161 for (i
= 0; i
< TMPL_ARGS_DEPTH (args
); ++i
)
25163 const_tree level
= TMPL_ARGS_LEVEL (args
, i
+ 1);
25164 for (j
= 0; j
< TREE_VEC_LENGTH (level
); ++j
)
25165 if (error_operand_p (TREE_VEC_ELT (level
, j
)))
25172 /* Returns TRUE if the template TMPL is type-dependent. */
25175 dependent_template_p (tree tmpl
)
25177 if (TREE_CODE (tmpl
) == OVERLOAD
)
25179 for (lkp_iterator
iter (tmpl
); iter
; ++iter
)
25180 if (dependent_template_p (*iter
))
25185 /* Template template parameters are dependent. */
25186 if (DECL_TEMPLATE_TEMPLATE_PARM_P (tmpl
)
25187 || TREE_CODE (tmpl
) == TEMPLATE_TEMPLATE_PARM
)
25189 /* So are names that have not been looked up. */
25190 if (TREE_CODE (tmpl
) == SCOPE_REF
|| identifier_p (tmpl
))
25195 /* Returns TRUE if the specialization TMPL<ARGS> is dependent. */
25198 dependent_template_id_p (tree tmpl
, tree args
)
25200 return (dependent_template_p (tmpl
)
25201 || any_dependent_template_arguments_p (args
));
25204 /* Returns TRUE if OMP_FOR with DECLV, INITV, CONDV and INCRV vectors
25208 dependent_omp_for_p (tree declv
, tree initv
, tree condv
, tree incrv
)
25212 if (!processing_template_decl
)
25215 for (i
= 0; i
< TREE_VEC_LENGTH (declv
); i
++)
25217 tree decl
= TREE_VEC_ELT (declv
, i
);
25218 tree init
= TREE_VEC_ELT (initv
, i
);
25219 tree cond
= TREE_VEC_ELT (condv
, i
);
25220 tree incr
= TREE_VEC_ELT (incrv
, i
);
25222 if (type_dependent_expression_p (decl
)
25223 || TREE_CODE (decl
) == SCOPE_REF
)
25226 if (init
&& type_dependent_expression_p (init
))
25229 if (type_dependent_expression_p (cond
))
25232 if (COMPARISON_CLASS_P (cond
)
25233 && (type_dependent_expression_p (TREE_OPERAND (cond
, 0))
25234 || type_dependent_expression_p (TREE_OPERAND (cond
, 1))))
25237 if (TREE_CODE (incr
) == MODOP_EXPR
)
25239 if (type_dependent_expression_p (TREE_OPERAND (incr
, 0))
25240 || type_dependent_expression_p (TREE_OPERAND (incr
, 2)))
25243 else if (type_dependent_expression_p (incr
))
25245 else if (TREE_CODE (incr
) == MODIFY_EXPR
)
25247 if (type_dependent_expression_p (TREE_OPERAND (incr
, 0)))
25249 else if (BINARY_CLASS_P (TREE_OPERAND (incr
, 1)))
25251 tree t
= TREE_OPERAND (incr
, 1);
25252 if (type_dependent_expression_p (TREE_OPERAND (t
, 0))
25253 || type_dependent_expression_p (TREE_OPERAND (t
, 1)))
25262 /* TYPE is a TYPENAME_TYPE. Returns the ordinary TYPE to which the
25263 TYPENAME_TYPE corresponds. Returns the original TYPENAME_TYPE if
25264 no such TYPE can be found. Note that this function peers inside
25265 uninstantiated templates and therefore should be used only in
25266 extremely limited situations. ONLY_CURRENT_P restricts this
25267 peering to the currently open classes hierarchy (which is required
25268 when comparing types). */
25271 resolve_typename_type (tree type
, bool only_current_p
)
25280 gcc_assert (TREE_CODE (type
) == TYPENAME_TYPE
);
25282 scope
= TYPE_CONTEXT (type
);
25283 /* We shouldn't have built a TYPENAME_TYPE with a non-dependent scope. */
25284 gcc_checking_assert (uses_template_parms (scope
));
25286 /* Usually the non-qualified identifier of a TYPENAME_TYPE is
25287 TYPE_IDENTIFIER (type). But when 'type' is a typedef variant of
25288 a TYPENAME_TYPE node, then TYPE_NAME (type) is set to the TYPE_DECL representing
25289 the typedef. In that case TYPE_IDENTIFIER (type) is not the non-qualified
25290 identifier of the TYPENAME_TYPE anymore.
25291 So by getting the TYPE_IDENTIFIER of the _main declaration_ of the
25292 TYPENAME_TYPE instead, we avoid messing up with a possible
25293 typedef variant case. */
25294 name
= TYPE_IDENTIFIER (TYPE_MAIN_VARIANT (type
));
25296 /* If the SCOPE is itself a TYPENAME_TYPE, then we need to resolve
25297 it first before we can figure out what NAME refers to. */
25298 if (TREE_CODE (scope
) == TYPENAME_TYPE
)
25300 if (TYPENAME_IS_RESOLVING_P (scope
))
25301 /* Given a class template A with a dependent base with nested type C,
25302 typedef typename A::C::C C will land us here, as trying to resolve
25303 the initial A::C leads to the local C typedef, which leads back to
25304 A::C::C. So we break the recursion now. */
25307 scope
= resolve_typename_type (scope
, only_current_p
);
25309 /* If we don't know what SCOPE refers to, then we cannot resolve the
25311 if (!CLASS_TYPE_P (scope
))
25313 /* If this is a typedef, we don't want to look inside (c++/11987). */
25314 if (typedef_variant_p (type
))
25316 /* If SCOPE isn't the template itself, it will not have a valid
25317 TYPE_FIELDS list. */
25318 if (same_type_p (scope
, CLASSTYPE_PRIMARY_TEMPLATE_TYPE (scope
)))
25319 /* scope is either the template itself or a compatible instantiation
25320 like X<T>, so look up the name in the original template. */
25321 scope
= CLASSTYPE_PRIMARY_TEMPLATE_TYPE (scope
);
25322 /* If scope has no fields, it can't be a current instantiation. Check this
25323 before currently_open_class to avoid infinite recursion (71515). */
25324 if (!TYPE_FIELDS (scope
))
25326 /* If the SCOPE is not the current instantiation, there's no reason
25327 to look inside it. */
25328 if (only_current_p
&& !currently_open_class (scope
))
25330 /* Enter the SCOPE so that name lookup will be resolved as if we
25331 were in the class definition. In particular, SCOPE will no
25332 longer be considered a dependent type. */
25333 pushed_scope
= push_scope (scope
);
25334 /* Look up the declaration. */
25335 decl
= lookup_member (scope
, name
, /*protect=*/0, /*want_type=*/true,
25336 tf_warning_or_error
);
25338 result
= NULL_TREE
;
25340 /* For a TYPENAME_TYPE like "typename X::template Y<T>", we want to
25341 find a TEMPLATE_DECL. Otherwise, we want to find a TYPE_DECL. */
25342 tree fullname
= TYPENAME_TYPE_FULLNAME (type
);
25345 else if (identifier_p (fullname
)
25346 && TREE_CODE (decl
) == TYPE_DECL
)
25348 result
= TREE_TYPE (decl
);
25349 if (result
== error_mark_node
)
25350 result
= NULL_TREE
;
25352 else if (TREE_CODE (fullname
) == TEMPLATE_ID_EXPR
25353 && DECL_CLASS_TEMPLATE_P (decl
))
25355 /* Obtain the template and the arguments. */
25356 tree tmpl
= TREE_OPERAND (fullname
, 0);
25357 if (TREE_CODE (tmpl
) == IDENTIFIER_NODE
)
25359 /* We get here with a plain identifier because a previous tentative
25360 parse of the nested-name-specifier as part of a ptr-operator saw
25361 ::template X<A>. The use of ::template is necessary in a
25362 ptr-operator, but wrong in a declarator-id.
25364 [temp.names]: In a qualified-id of a declarator-id, the keyword
25365 template shall not appear at the top level. */
25366 pedwarn (EXPR_LOC_OR_LOC (fullname
, input_location
), OPT_Wpedantic
,
25367 "keyword %<template%> not allowed in declarator-id");
25370 tree args
= TREE_OPERAND (fullname
, 1);
25371 /* Instantiate the template. */
25372 result
= lookup_template_class (tmpl
, args
, NULL_TREE
, NULL_TREE
,
25373 /*entering_scope=*/true,
25374 tf_error
| tf_user
);
25375 if (result
== error_mark_node
)
25376 result
= NULL_TREE
;
25379 /* Leave the SCOPE. */
25381 pop_scope (pushed_scope
);
25383 /* If we failed to resolve it, return the original typename. */
25387 /* If lookup found a typename type, resolve that too. */
25388 if (TREE_CODE (result
) == TYPENAME_TYPE
&& !TYPENAME_IS_RESOLVING_P (result
))
25390 /* Ill-formed programs can cause infinite recursion here, so we
25391 must catch that. */
25392 TYPENAME_IS_RESOLVING_P (result
) = 1;
25393 result
= resolve_typename_type (result
, only_current_p
);
25394 TYPENAME_IS_RESOLVING_P (result
) = 0;
25397 /* Qualify the resulting type. */
25398 quals
= cp_type_quals (type
);
25400 result
= cp_build_qualified_type (result
, cp_type_quals (result
) | quals
);
25405 /* EXPR is an expression which is not type-dependent. Return a proxy
25406 for EXPR that can be used to compute the types of larger
25407 expressions containing EXPR. */
25410 build_non_dependent_expr (tree expr
)
25412 tree orig_expr
= expr
;
25415 /* When checking, try to get a constant value for all non-dependent
25416 expressions in order to expose bugs in *_dependent_expression_p
25417 and constexpr. This can affect code generation, see PR70704, so
25418 only do this for -fchecking=2. */
25419 if (flag_checking
> 1
25420 && cxx_dialect
>= cxx11
25421 /* Don't do this during nsdmi parsing as it can lead to
25422 unexpected recursive instantiations. */
25423 && !parsing_nsdmi ()
25424 /* Don't do this during concept expansion either and for
25425 the same reason. */
25426 && !expanding_concept ())
25427 fold_non_dependent_expr (expr
);
25429 STRIP_ANY_LOCATION_WRAPPER (expr
);
25431 /* Preserve OVERLOADs; the functions must be available to resolve
25434 if (TREE_CODE (inner_expr
) == STMT_EXPR
)
25435 inner_expr
= stmt_expr_value_expr (inner_expr
);
25436 if (TREE_CODE (inner_expr
) == ADDR_EXPR
)
25437 inner_expr
= TREE_OPERAND (inner_expr
, 0);
25438 if (TREE_CODE (inner_expr
) == COMPONENT_REF
)
25439 inner_expr
= TREE_OPERAND (inner_expr
, 1);
25440 if (is_overloaded_fn (inner_expr
)
25441 || TREE_CODE (inner_expr
) == OFFSET_REF
)
25443 /* There is no need to return a proxy for a variable. */
25446 /* Preserve string constants; conversions from string constants to
25447 "char *" are allowed, even though normally a "const char *"
25448 cannot be used to initialize a "char *". */
25449 if (TREE_CODE (expr
) == STRING_CST
)
25451 /* Preserve void and arithmetic constants, as an optimization -- there is no
25452 reason to create a new node. */
25453 if (TREE_CODE (expr
) == VOID_CST
25454 || TREE_CODE (expr
) == INTEGER_CST
25455 || TREE_CODE (expr
) == REAL_CST
)
25457 /* Preserve THROW_EXPRs -- all throw-expressions have type "void".
25458 There is at least one place where we want to know that a
25459 particular expression is a throw-expression: when checking a ?:
25460 expression, there are special rules if the second or third
25461 argument is a throw-expression. */
25462 if (TREE_CODE (expr
) == THROW_EXPR
)
25465 /* Don't wrap an initializer list, we need to be able to look inside. */
25466 if (BRACE_ENCLOSED_INITIALIZER_P (expr
))
25469 /* Don't wrap a dummy object, we need to be able to test for it. */
25470 if (is_dummy_object (expr
))
25473 if (TREE_CODE (expr
) == COND_EXPR
)
25474 return build3 (COND_EXPR
,
25476 TREE_OPERAND (expr
, 0),
25477 (TREE_OPERAND (expr
, 1)
25478 ? build_non_dependent_expr (TREE_OPERAND (expr
, 1))
25479 : build_non_dependent_expr (TREE_OPERAND (expr
, 0))),
25480 build_non_dependent_expr (TREE_OPERAND (expr
, 2)));
25481 if (TREE_CODE (expr
) == COMPOUND_EXPR
25482 && !COMPOUND_EXPR_OVERLOADED (expr
))
25483 return build2 (COMPOUND_EXPR
,
25485 TREE_OPERAND (expr
, 0),
25486 build_non_dependent_expr (TREE_OPERAND (expr
, 1)));
25488 /* If the type is unknown, it can't really be non-dependent */
25489 gcc_assert (TREE_TYPE (expr
) != unknown_type_node
);
25491 /* Otherwise, build a NON_DEPENDENT_EXPR. */
25492 return build1_loc (EXPR_LOCATION (orig_expr
), NON_DEPENDENT_EXPR
,
25493 TREE_TYPE (expr
), expr
);
25496 /* ARGS is a vector of expressions as arguments to a function call.
25497 Replace the arguments with equivalent non-dependent expressions.
25498 This modifies ARGS in place. */
25501 make_args_non_dependent (vec
<tree
, va_gc
> *args
)
25506 FOR_EACH_VEC_SAFE_ELT (args
, ix
, arg
)
25508 tree newarg
= build_non_dependent_expr (arg
);
25510 (*args
)[ix
] = newarg
;
25514 /* Returns a type which represents 'auto' or 'decltype(auto)'. We use a
25515 TEMPLATE_TYPE_PARM with a level one deeper than the actual template
25516 parms. If set_canonical is true, we set TYPE_CANONICAL on it. */
25519 make_auto_1 (tree name
, bool set_canonical
)
25521 tree au
= cxx_make_type (TEMPLATE_TYPE_PARM
);
25522 TYPE_NAME (au
) = build_decl (input_location
,
25523 TYPE_DECL
, name
, au
);
25524 TYPE_STUB_DECL (au
) = TYPE_NAME (au
);
25525 TEMPLATE_TYPE_PARM_INDEX (au
) = build_template_parm_index
25526 (0, processing_template_decl
+ 1, processing_template_decl
+ 1,
25527 TYPE_NAME (au
), NULL_TREE
);
25529 TYPE_CANONICAL (au
) = canonical_type_parameter (au
);
25530 DECL_ARTIFICIAL (TYPE_NAME (au
)) = 1;
25531 SET_DECL_TEMPLATE_PARM_P (TYPE_NAME (au
));
25537 make_decltype_auto (void)
25539 return make_auto_1 (decltype_auto_identifier
, true);
25545 return make_auto_1 (auto_identifier
, true);
25548 /* Return a C++17 deduction placeholder for class template TMPL. */
25551 make_template_placeholder (tree tmpl
)
25553 tree t
= make_auto_1 (DECL_NAME (tmpl
), true);
25554 CLASS_PLACEHOLDER_TEMPLATE (t
) = tmpl
;
25558 /* True iff T is a C++17 class template deduction placeholder. */
25561 template_placeholder_p (tree t
)
25563 return is_auto (t
) && CLASS_PLACEHOLDER_TEMPLATE (t
);
25566 /* Make a "constrained auto" type-specifier. This is an
25567 auto type with constraints that must be associated after
25568 deduction. The constraint is formed from the given
25569 CONC and its optional sequence of arguments, which are
25570 non-null if written as partial-concept-id. */
25573 make_constrained_auto (tree con
, tree args
)
25575 tree type
= make_auto_1 (auto_identifier
, false);
25577 /* Build the constraint. */
25578 tree tmpl
= DECL_TI_TEMPLATE (con
);
25579 tree expr
= VAR_P (con
) ? tmpl
: ovl_make (tmpl
);
25580 expr
= build_concept_check (expr
, type
, args
);
25582 tree constr
= normalize_expression (expr
);
25583 PLACEHOLDER_TYPE_CONSTRAINTS (type
) = constr
;
25585 /* Our canonical type depends on the constraint. */
25586 TYPE_CANONICAL (type
) = canonical_type_parameter (type
);
25588 /* Attach the constraint to the type declaration. */
25589 tree decl
= TYPE_NAME (type
);
25593 /* Given type ARG, return std::initializer_list<ARG>. */
25598 tree std_init_list
= get_namespace_binding (std_node
, init_list_identifier
);
25600 if (!std_init_list
|| !DECL_CLASS_TEMPLATE_P (std_init_list
))
25602 gcc_rich_location
richloc (input_location
);
25603 maybe_add_include_fixit (&richloc
, "<initializer_list>");
25604 error_at (&richloc
,
25605 "deducing from brace-enclosed initializer list"
25606 " requires %<#include <initializer_list>%>");
25608 return error_mark_node
;
25610 tree argvec
= make_tree_vec (1);
25611 TREE_VEC_ELT (argvec
, 0) = arg
;
25613 return lookup_template_class (std_init_list
, argvec
, NULL_TREE
,
25614 NULL_TREE
, 0, tf_warning_or_error
);
25617 /* Replace auto in TYPE with std::initializer_list<auto>. */
25620 listify_autos (tree type
, tree auto_node
)
25622 tree init_auto
= listify (auto_node
);
25623 tree argvec
= make_tree_vec (1);
25624 TREE_VEC_ELT (argvec
, 0) = init_auto
;
25625 if (processing_template_decl
)
25626 argvec
= add_to_template_args (current_template_args (), argvec
);
25627 return tsubst (type
, argvec
, tf_warning_or_error
, NULL_TREE
);
25630 /* Hash traits for hashing possibly constrained 'auto'
25631 TEMPLATE_TYPE_PARMs for use by do_auto_deduction. */
25633 struct auto_hash
: default_hash_traits
<tree
>
25635 static inline hashval_t
hash (tree
);
25636 static inline bool equal (tree
, tree
);
25639 /* Hash the 'auto' T. */
25642 auto_hash::hash (tree t
)
25644 if (tree c
= PLACEHOLDER_TYPE_CONSTRAINTS (t
))
25645 /* Matching constrained-type-specifiers denote the same template
25646 parameter, so hash the constraint. */
25647 return hash_placeholder_constraint (c
);
25649 /* But unconstrained autos are all separate, so just hash the pointer. */
25650 return iterative_hash_object (t
, 0);
25653 /* Compare two 'auto's. */
25656 auto_hash::equal (tree t1
, tree t2
)
25661 tree c1
= PLACEHOLDER_TYPE_CONSTRAINTS (t1
);
25662 tree c2
= PLACEHOLDER_TYPE_CONSTRAINTS (t2
);
25664 /* Two unconstrained autos are distinct. */
25668 return equivalent_placeholder_constraints (c1
, c2
);
25671 /* for_each_template_parm callback for extract_autos: if t is a (possibly
25672 constrained) auto, add it to the vector. */
25675 extract_autos_r (tree t
, void *data
)
25677 hash_table
<auto_hash
> &hash
= *(hash_table
<auto_hash
>*)data
;
25680 /* All the autos were built with index 0; fix that up now. */
25681 tree
*p
= hash
.find_slot (t
, INSERT
);
25684 /* If this is a repeated constrained-type-specifier, use the index we
25686 idx
= TEMPLATE_PARM_IDX (TEMPLATE_TYPE_PARM_INDEX (*p
));
25689 /* Otherwise this is new, so use the current count. */
25691 idx
= hash
.elements () - 1;
25693 TEMPLATE_PARM_IDX (TEMPLATE_TYPE_PARM_INDEX (t
)) = idx
;
25696 /* Always keep walking. */
25700 /* Return a TREE_VEC of the 'auto's used in type under the Concepts TS, which
25701 says they can appear anywhere in the type. */
25704 extract_autos (tree type
)
25706 hash_set
<tree
> visited
;
25707 hash_table
<auto_hash
> hash (2);
25709 for_each_template_parm (type
, extract_autos_r
, &hash
, &visited
, true);
25711 tree tree_vec
= make_tree_vec (hash
.elements());
25712 for (hash_table
<auto_hash
>::iterator iter
= hash
.begin();
25713 iter
!= hash
.end(); ++iter
)
25716 unsigned i
= TEMPLATE_PARM_IDX (TEMPLATE_TYPE_PARM_INDEX (elt
));
25717 TREE_VEC_ELT (tree_vec
, i
)
25718 = build_tree_list (NULL_TREE
, TYPE_NAME (elt
));
25724 /* The stem for deduction guide names. */
25725 const char *const dguide_base
= "__dguide_";
25727 /* Return the name for a deduction guide for class template TMPL. */
25730 dguide_name (tree tmpl
)
25732 tree type
= (TYPE_P (tmpl
) ? tmpl
: TREE_TYPE (tmpl
));
25733 tree tname
= TYPE_IDENTIFIER (type
);
25734 char *buf
= (char *) alloca (1 + strlen (dguide_base
)
25735 + IDENTIFIER_LENGTH (tname
));
25736 memcpy (buf
, dguide_base
, strlen (dguide_base
));
25737 memcpy (buf
+ strlen (dguide_base
), IDENTIFIER_POINTER (tname
),
25738 IDENTIFIER_LENGTH (tname
) + 1);
25739 tree dname
= get_identifier (buf
);
25740 TREE_TYPE (dname
) = type
;
25744 /* True if NAME is the name of a deduction guide. */
25747 dguide_name_p (tree name
)
25749 return (TREE_CODE (name
) == IDENTIFIER_NODE
25750 && TREE_TYPE (name
)
25751 && !strncmp (IDENTIFIER_POINTER (name
), dguide_base
,
25752 strlen (dguide_base
)));
25755 /* True if FN is a deduction guide. */
25758 deduction_guide_p (const_tree fn
)
25761 if (tree name
= DECL_NAME (fn
))
25762 return dguide_name_p (name
);
25766 /* True if FN is the copy deduction guide, i.e. A(A)->A. */
25769 copy_guide_p (const_tree fn
)
25771 gcc_assert (deduction_guide_p (fn
));
25772 if (!DECL_ARTIFICIAL (fn
))
25774 tree parms
= FUNCTION_FIRST_USER_PARMTYPE (DECL_TI_TEMPLATE (fn
));
25775 return (TREE_CHAIN (parms
) == void_list_node
25776 && same_type_p (TREE_VALUE (parms
), TREE_TYPE (DECL_NAME (fn
))));
25779 /* True if FN is a guide generated from a constructor template. */
25782 template_guide_p (const_tree fn
)
25784 gcc_assert (deduction_guide_p (fn
));
25785 if (!DECL_ARTIFICIAL (fn
))
25787 tree tmpl
= DECL_TI_TEMPLATE (fn
);
25788 if (tree org
= DECL_ABSTRACT_ORIGIN (tmpl
))
25789 return PRIMARY_TEMPLATE_P (org
);
25793 /* OLDDECL is a _DECL for a template parameter. Return a similar parameter at
25794 LEVEL:INDEX, using tsubst_args and complain for substitution into non-type
25795 template parameter types. Note that the handling of template template
25796 parameters relies on current_template_parms being set appropriately for the
25800 rewrite_template_parm (tree olddecl
, unsigned index
, unsigned level
,
25801 tree tsubst_args
, tsubst_flags_t complain
)
25803 tree oldidx
= get_template_parm_index (olddecl
);
25806 if (TREE_CODE (olddecl
) == TYPE_DECL
25807 || TREE_CODE (olddecl
) == TEMPLATE_DECL
)
25809 tree oldtype
= TREE_TYPE (olddecl
);
25810 newtype
= cxx_make_type (TREE_CODE (oldtype
));
25811 TYPE_MAIN_VARIANT (newtype
) = newtype
;
25812 if (TREE_CODE (oldtype
) == TEMPLATE_TYPE_PARM
)
25813 TEMPLATE_TYPE_PARM_FOR_CLASS (newtype
)
25814 = TEMPLATE_TYPE_PARM_FOR_CLASS (oldtype
);
25818 newtype
= TREE_TYPE (olddecl
);
25819 if (type_uses_auto (newtype
))
25821 // Substitute once to fix references to other template parameters.
25822 newtype
= tsubst (newtype
, tsubst_args
,
25823 complain
|tf_partial
, NULL_TREE
);
25824 // Now substitute again to reduce the level of the auto.
25825 newtype
= tsubst (newtype
, current_template_args (),
25826 complain
, NULL_TREE
);
25829 newtype
= tsubst (newtype
, tsubst_args
,
25830 complain
, NULL_TREE
);
25834 = build_decl (DECL_SOURCE_LOCATION (olddecl
), TREE_CODE (olddecl
),
25835 DECL_NAME (olddecl
), newtype
);
25836 SET_DECL_TEMPLATE_PARM_P (newdecl
);
25839 if (TREE_CODE (olddecl
) == TYPE_DECL
25840 || TREE_CODE (olddecl
) == TEMPLATE_DECL
)
25842 newidx
= TEMPLATE_TYPE_PARM_INDEX (newtype
)
25843 = build_template_parm_index (index
, level
, level
,
25845 TEMPLATE_PARM_PARAMETER_PACK (newidx
)
25846 = TEMPLATE_PARM_PARAMETER_PACK (oldidx
);
25847 TYPE_STUB_DECL (newtype
) = TYPE_NAME (newtype
) = newdecl
;
25848 TYPE_CANONICAL (newtype
) = canonical_type_parameter (newtype
);
25850 if (TREE_CODE (olddecl
) == TEMPLATE_DECL
)
25852 DECL_TEMPLATE_RESULT (newdecl
)
25853 = build_decl (DECL_SOURCE_LOCATION (olddecl
), TYPE_DECL
,
25854 DECL_NAME (olddecl
), newtype
);
25855 DECL_ARTIFICIAL (DECL_TEMPLATE_RESULT (newdecl
)) = true;
25856 // First create a copy (ttargs) of tsubst_args with an
25857 // additional level for the template template parameter's own
25858 // template parameters (ttparms).
25859 tree ttparms
= (INNERMOST_TEMPLATE_PARMS
25860 (DECL_TEMPLATE_PARMS (olddecl
)));
25861 const int depth
= TMPL_ARGS_DEPTH (tsubst_args
);
25862 tree ttargs
= make_tree_vec (depth
+ 1);
25863 for (int i
= 0; i
< depth
; ++i
)
25864 TREE_VEC_ELT (ttargs
, i
) = TREE_VEC_ELT (tsubst_args
, i
);
25865 TREE_VEC_ELT (ttargs
, depth
)
25866 = template_parms_level_to_args (ttparms
);
25867 // Substitute ttargs into ttparms to fix references to
25868 // other template parameters.
25869 ttparms
= tsubst_template_parms_level (ttparms
, ttargs
,
25870 complain
|tf_partial
);
25871 // Now substitute again with args based on tparms, to reduce
25872 // the level of the ttparms.
25873 ttargs
= current_template_args ();
25874 ttparms
= tsubst_template_parms_level (ttparms
, ttargs
,
25876 // Finally, tack the adjusted parms onto tparms.
25877 ttparms
= tree_cons (size_int (depth
), ttparms
,
25878 current_template_parms
);
25879 DECL_TEMPLATE_PARMS (newdecl
) = ttparms
;
25884 tree oldconst
= TEMPLATE_PARM_DECL (oldidx
);
25886 = build_decl (DECL_SOURCE_LOCATION (oldconst
),
25887 TREE_CODE (oldconst
),
25888 DECL_NAME (oldconst
), newtype
);
25889 TREE_CONSTANT (newconst
) = TREE_CONSTANT (newdecl
)
25890 = TREE_READONLY (newconst
) = TREE_READONLY (newdecl
) = true;
25891 SET_DECL_TEMPLATE_PARM_P (newconst
);
25892 newidx
= build_template_parm_index (index
, level
, level
,
25893 newconst
, newtype
);
25894 TEMPLATE_PARM_PARAMETER_PACK (newidx
)
25895 = TEMPLATE_PARM_PARAMETER_PACK (oldidx
);
25896 DECL_INITIAL (newdecl
) = DECL_INITIAL (newconst
) = newidx
;
25902 /* Returns a C++17 class deduction guide template based on the constructor
25903 CTOR. As a special case, CTOR can be a RECORD_TYPE for an implicit default
25904 guide, or REFERENCE_TYPE for an implicit copy/move guide. */
25907 build_deduction_guide (tree ctor
, tree outer_args
, tsubst_flags_t complain
)
25909 tree type
, tparms
, targs
, fparms
, fargs
, ci
;
25910 bool memtmpl
= false;
25913 tree fn_tmpl
= NULL_TREE
;
25918 bool copy_p
= TREE_CODE (type
) == REFERENCE_TYPE
;
25921 type
= TREE_TYPE (type
);
25922 fparms
= tree_cons (NULL_TREE
, type
, void_list_node
);
25925 fparms
= void_list_node
;
25927 tree ctmpl
= CLASSTYPE_TI_TEMPLATE (type
);
25928 tparms
= DECL_TEMPLATE_PARMS (ctmpl
);
25929 targs
= CLASSTYPE_TI_ARGS (type
);
25932 loc
= DECL_SOURCE_LOCATION (ctmpl
);
25933 explicit_p
= false;
25937 ++processing_template_decl
;
25940 = (TREE_CODE (ctor
) == TEMPLATE_DECL
? ctor
25941 : DECL_TI_TEMPLATE (ctor
));
25943 fn_tmpl
= tsubst (fn_tmpl
, outer_args
, complain
, ctor
);
25944 ctor
= DECL_TEMPLATE_RESULT (fn_tmpl
);
25946 type
= DECL_CONTEXT (ctor
);
25948 tparms
= DECL_TEMPLATE_PARMS (fn_tmpl
);
25949 /* If type is a member class template, DECL_TI_ARGS (ctor) will have
25950 fully specialized args for the enclosing class. Strip those off, as
25951 the deduction guide won't have those template parameters. */
25952 targs
= get_innermost_template_args (DECL_TI_ARGS (ctor
),
25953 TMPL_PARMS_DEPTH (tparms
));
25954 /* Discard the 'this' parameter. */
25955 fparms
= FUNCTION_ARG_CHAIN (ctor
);
25956 fargs
= TREE_CHAIN (DECL_ARGUMENTS (ctor
));
25957 ci
= get_constraints (ctor
);
25958 loc
= DECL_SOURCE_LOCATION (ctor
);
25959 explicit_p
= DECL_NONCONVERTING_P (ctor
);
25961 if (PRIMARY_TEMPLATE_P (fn_tmpl
))
25965 /* For a member template constructor, we need to flatten the two
25966 template parameter lists into one, and then adjust the function
25967 signature accordingly. This gets...complicated. */
25968 tree save_parms
= current_template_parms
;
25970 /* For a member template we should have two levels of parms/args, one
25971 for the class and one for the constructor. We stripped
25972 specialized args for further enclosing classes above. */
25973 const int depth
= 2;
25974 gcc_assert (TMPL_ARGS_DEPTH (targs
) == depth
);
25976 /* Template args for translating references to the two-level template
25977 parameters into references to the one-level template parameters we
25979 tree tsubst_args
= copy_node (targs
);
25980 TMPL_ARGS_LEVEL (tsubst_args
, depth
)
25981 = copy_node (TMPL_ARGS_LEVEL (tsubst_args
, depth
));
25983 /* Template parms for the constructor template. */
25984 tree ftparms
= TREE_VALUE (tparms
);
25985 unsigned flen
= TREE_VEC_LENGTH (ftparms
);
25986 /* Template parms for the class template. */
25987 tparms
= TREE_CHAIN (tparms
);
25988 tree ctparms
= TREE_VALUE (tparms
);
25989 unsigned clen
= TREE_VEC_LENGTH (ctparms
);
25990 /* Template parms for the deduction guide start as a copy of the
25991 template parms for the class. We set current_template_parms for
25992 lookup_template_class_1. */
25993 current_template_parms
= tparms
= copy_node (tparms
);
25994 tree new_vec
= TREE_VALUE (tparms
) = make_tree_vec (flen
+ clen
);
25995 for (unsigned i
= 0; i
< clen
; ++i
)
25996 TREE_VEC_ELT (new_vec
, i
) = TREE_VEC_ELT (ctparms
, i
);
25998 /* Now we need to rewrite the constructor parms to append them to the
26000 for (unsigned i
= 0; i
< flen
; ++i
)
26002 unsigned index
= i
+ clen
;
26003 unsigned level
= 1;
26004 tree oldelt
= TREE_VEC_ELT (ftparms
, i
);
26005 tree olddecl
= TREE_VALUE (oldelt
);
26006 tree newdecl
= rewrite_template_parm (olddecl
, index
, level
,
26007 tsubst_args
, complain
);
26008 tree newdef
= tsubst_template_arg (TREE_PURPOSE (oldelt
),
26009 tsubst_args
, complain
, ctor
);
26010 tree list
= build_tree_list (newdef
, newdecl
);
26011 TEMPLATE_PARM_CONSTRAINTS (list
)
26012 = tsubst_constraint_info (TEMPLATE_PARM_CONSTRAINTS (oldelt
),
26013 tsubst_args
, complain
, ctor
);
26014 TREE_VEC_ELT (new_vec
, index
) = list
;
26015 TMPL_ARG (tsubst_args
, depth
, i
) = template_parm_to_arg (list
);
26018 /* Now we have a final set of template parms to substitute into the
26019 function signature. */
26020 targs
= template_parms_to_args (tparms
);
26021 fparms
= tsubst_arg_types (fparms
, tsubst_args
, NULL_TREE
,
26023 fargs
= tsubst (fargs
, tsubst_args
, complain
, ctor
);
26025 ci
= tsubst_constraint_info (ci
, tsubst_args
, complain
, ctor
);
26027 current_template_parms
= save_parms
;
26029 --processing_template_decl
;
26034 /* Copy the parms so we can set DECL_PRIMARY_TEMPLATE. */
26035 tparms
= copy_node (tparms
);
26036 INNERMOST_TEMPLATE_PARMS (tparms
)
26037 = copy_node (INNERMOST_TEMPLATE_PARMS (tparms
));
26040 tree fntype
= build_function_type (type
, fparms
);
26041 tree ded_fn
= build_lang_decl_loc (loc
,
26043 dguide_name (type
), fntype
);
26044 DECL_ARGUMENTS (ded_fn
) = fargs
;
26045 DECL_ARTIFICIAL (ded_fn
) = true;
26046 DECL_NONCONVERTING_P (ded_fn
) = explicit_p
;
26047 tree ded_tmpl
= build_template_decl (ded_fn
, tparms
, /*member*/false);
26048 DECL_ARTIFICIAL (ded_tmpl
) = true;
26049 DECL_TEMPLATE_RESULT (ded_tmpl
) = ded_fn
;
26050 TREE_TYPE (ded_tmpl
) = TREE_TYPE (ded_fn
);
26051 DECL_TEMPLATE_INFO (ded_fn
) = build_template_info (ded_tmpl
, targs
);
26052 DECL_PRIMARY_TEMPLATE (ded_tmpl
) = ded_tmpl
;
26054 DECL_ABSTRACT_ORIGIN (ded_tmpl
) = fn_tmpl
;
26056 set_constraints (ded_tmpl
, ci
);
26061 /* Deduce template arguments for the class template placeholder PTYPE for
26062 template TMPL based on the initializer INIT, and return the resulting
26066 do_class_deduction (tree ptype
, tree tmpl
, tree init
, int flags
,
26067 tsubst_flags_t complain
)
26069 if (!DECL_CLASS_TEMPLATE_P (tmpl
))
26071 /* We should have handled this in the caller. */
26072 if (DECL_TEMPLATE_TEMPLATE_PARM_P (tmpl
))
26074 if (complain
& tf_error
)
26075 error ("non-class template %qT used without template arguments", tmpl
);
26076 return error_mark_node
;
26079 tree type
= TREE_TYPE (tmpl
);
26081 bool try_list_ctor
= false;
26083 vec
<tree
,va_gc
> *args
;
26084 if (init
== NULL_TREE
26085 || TREE_CODE (init
) == TREE_LIST
)
26086 args
= make_tree_vector_from_list (init
);
26087 else if (BRACE_ENCLOSED_INITIALIZER_P (init
))
26089 try_list_ctor
= TYPE_HAS_LIST_CTOR (type
);
26090 if (try_list_ctor
&& CONSTRUCTOR_NELTS (init
) == 1)
26092 /* As an exception, the first phase in 16.3.1.7 (considering the
26093 initializer list as a single argument) is omitted if the
26094 initializer list consists of a single expression of type cv U,
26095 where U is a specialization of C or a class derived from a
26096 specialization of C. */
26097 tree elt
= CONSTRUCTOR_ELT (init
, 0)->value
;
26098 tree etype
= TREE_TYPE (elt
);
26100 tree tparms
= INNERMOST_TEMPLATE_PARMS (DECL_TEMPLATE_PARMS (tmpl
));
26101 tree targs
= make_tree_vec (TREE_VEC_LENGTH (tparms
));
26102 int err
= unify (tparms
, targs
, type
, etype
,
26103 UNIFY_ALLOW_DERIVED
, /*explain*/false);
26105 try_list_ctor
= false;
26108 if (try_list_ctor
|| is_std_init_list (type
))
26109 args
= make_tree_vector_single (init
);
26111 args
= make_tree_vector_from_ctor (init
);
26114 args
= make_tree_vector_single (init
);
26116 tree dname
= dguide_name (tmpl
);
26117 tree cands
= lookup_qualified_name (CP_DECL_CONTEXT (tmpl
), dname
,
26118 /*type*/false, /*complain*/false,
26120 bool elided
= false;
26121 if (cands
== error_mark_node
)
26124 /* Prune explicit deduction guides in copy-initialization context. */
26125 if (flags
& LOOKUP_ONLYCONVERTING
)
26127 for (lkp_iterator
iter (cands
); !elided
&& iter
; ++iter
)
26128 if (DECL_NONCONVERTING_P (STRIP_TEMPLATE (*iter
)))
26133 /* Found a nonconverting guide, prune the candidates. */
26134 tree pruned
= NULL_TREE
;
26135 for (lkp_iterator
iter (cands
); iter
; ++iter
)
26136 if (!DECL_NONCONVERTING_P (STRIP_TEMPLATE (*iter
)))
26137 pruned
= lookup_add (*iter
, pruned
);
26143 tree outer_args
= NULL_TREE
;
26144 if (DECL_CLASS_SCOPE_P (tmpl
)
26145 && CLASSTYPE_TEMPLATE_INFO (DECL_CONTEXT (tmpl
)))
26147 outer_args
= CLASSTYPE_TI_ARGS (DECL_CONTEXT (tmpl
));
26148 type
= TREE_TYPE (most_general_template (tmpl
));
26151 bool saw_ctor
= false;
26152 // FIXME cache artificial deduction guides
26153 for (ovl_iterator
iter (CLASSTYPE_CONSTRUCTORS (type
)); iter
; ++iter
)
26155 tree guide
= build_deduction_guide (*iter
, outer_args
, complain
);
26156 if ((flags
& LOOKUP_ONLYCONVERTING
)
26157 && DECL_NONCONVERTING_P (STRIP_TEMPLATE (guide
)))
26160 cands
= lookup_add (guide
, cands
);
26165 tree call
= error_mark_node
;
26167 /* If this is list-initialization and the class has a list constructor, first
26168 try deducing from the list as a single argument, as [over.match.list]. */
26169 tree list_cands
= NULL_TREE
;
26170 if (try_list_ctor
&& cands
)
26171 for (lkp_iterator
iter (cands
); iter
; ++iter
)
26174 if (is_list_ctor (dg
))
26175 list_cands
= lookup_add (dg
, list_cands
);
26179 ++cp_unevaluated_operand
;
26180 call
= build_new_function_call (list_cands
, &args
, tf_decltype
);
26181 --cp_unevaluated_operand
;
26183 if (call
== error_mark_node
)
26185 /* That didn't work, now try treating the list as a sequence of
26187 release_tree_vector (args
);
26188 args
= make_tree_vector_from_ctor (init
);
26192 /* Maybe generate an implicit deduction guide. */
26193 if (call
== error_mark_node
&& args
->length () < 2)
26195 tree gtype
= NULL_TREE
;
26197 if (args
->length () == 1)
26198 /* Generate a copy guide. */
26199 gtype
= build_reference_type (type
);
26200 else if (!saw_ctor
)
26201 /* Generate a default guide. */
26206 tree guide
= build_deduction_guide (gtype
, outer_args
, complain
);
26207 cands
= lookup_add (guide
, cands
);
26211 if (elided
&& !cands
)
26213 error ("cannot deduce template arguments for copy-initialization"
26214 " of %qT, as it has no non-explicit deduction guides or "
26215 "user-declared constructors", type
);
26216 return error_mark_node
;
26218 else if (!cands
&& call
== error_mark_node
)
26220 error ("cannot deduce template arguments of %qT, as it has no viable "
26221 "deduction guides", type
);
26222 return error_mark_node
;
26225 if (call
== error_mark_node
)
26227 ++cp_unevaluated_operand
;
26228 call
= build_new_function_call (cands
, &args
, tf_decltype
);
26229 --cp_unevaluated_operand
;
26232 if (call
== error_mark_node
&& (complain
& tf_warning_or_error
))
26234 error ("class template argument deduction failed:");
26236 ++cp_unevaluated_operand
;
26237 call
= build_new_function_call (cands
, &args
, complain
| tf_decltype
);
26238 --cp_unevaluated_operand
;
26241 inform (input_location
, "explicit deduction guides not considered "
26242 "for copy-initialization");
26245 release_tree_vector (args
);
26247 return cp_build_qualified_type (TREE_TYPE (call
), cp_type_quals (ptype
));
26250 /* Replace occurrences of 'auto' in TYPE with the appropriate type deduced
26251 from INIT. AUTO_NODE is the TEMPLATE_TYPE_PARM used for 'auto' in TYPE.
26252 The CONTEXT determines the context in which auto deduction is performed
26253 and is used to control error diagnostics. FLAGS are the LOOKUP_* flags.
26254 OUTER_TARGS are used during template argument deduction
26255 (context == adc_unify) to properly substitute the result, and is ignored
26258 For partial-concept-ids, extra args may be appended to the list of deduced
26259 template arguments prior to determining constraint satisfaction. */
26262 do_auto_deduction (tree type
, tree init
, tree auto_node
,
26263 tsubst_flags_t complain
, auto_deduction_context context
,
26264 tree outer_targs
, int flags
)
26268 if (init
== error_mark_node
)
26269 return error_mark_node
;
26271 if (init
&& type_dependent_expression_p (init
)
26272 && context
!= adc_unify
)
26273 /* Defining a subset of type-dependent expressions that we can deduce
26274 from ahead of time isn't worth the trouble. */
26277 /* Similarly, we can't deduce from another undeduced decl. */
26278 if (init
&& undeduced_auto_decl (init
))
26281 if (tree tmpl
= CLASS_PLACEHOLDER_TEMPLATE (auto_node
))
26282 /* C++17 class template argument deduction. */
26283 return do_class_deduction (type
, tmpl
, init
, flags
, complain
);
26285 if (init
== NULL_TREE
|| TREE_TYPE (init
) == NULL_TREE
)
26286 /* Nothing we can do with this, even in deduction context. */
26289 /* [dcl.spec.auto]: Obtain P from T by replacing the occurrences of auto
26290 with either a new invented type template parameter U or, if the
26291 initializer is a braced-init-list (8.5.4), with
26292 std::initializer_list<U>. */
26293 if (BRACE_ENCLOSED_INITIALIZER_P (init
))
26295 if (!DIRECT_LIST_INIT_P (init
))
26296 type
= listify_autos (type
, auto_node
);
26297 else if (CONSTRUCTOR_NELTS (init
) == 1)
26298 init
= CONSTRUCTOR_ELT (init
, 0)->value
;
26301 if (complain
& tf_warning_or_error
)
26303 if (permerror (input_location
, "direct-list-initialization of "
26304 "%<auto%> requires exactly one element"))
26305 inform (input_location
,
26306 "for deduction to %<std::initializer_list%>, use copy-"
26307 "list-initialization (i.e. add %<=%> before the %<{%>)");
26309 type
= listify_autos (type
, auto_node
);
26313 if (type
== error_mark_node
)
26314 return error_mark_node
;
26316 init
= resolve_nondeduced_context (init
, complain
);
26318 if (context
== adc_decomp_type
26319 && auto_node
== type
26320 && init
!= error_mark_node
26321 && TREE_CODE (TREE_TYPE (init
)) == ARRAY_TYPE
)
26322 /* [dcl.decomp]/1 - if decomposition declaration has no ref-qualifiers
26323 and initializer has array type, deduce cv-qualified array type. */
26324 return cp_build_qualified_type_real (TREE_TYPE (init
), TYPE_QUALS (type
),
26326 else if (AUTO_IS_DECLTYPE (auto_node
))
26328 bool id
= (DECL_P (init
)
26329 || ((TREE_CODE (init
) == COMPONENT_REF
26330 || TREE_CODE (init
) == SCOPE_REF
)
26331 && !REF_PARENTHESIZED_P (init
)));
26332 targs
= make_tree_vec (1);
26333 TREE_VEC_ELT (targs
, 0)
26334 = finish_decltype_type (init
, id
, tf_warning_or_error
);
26335 if (type
!= auto_node
)
26337 if (complain
& tf_error
)
26338 error ("%qT as type rather than plain %<decltype(auto)%>", type
);
26339 return error_mark_node
;
26344 tree parms
= build_tree_list (NULL_TREE
, type
);
26348 tparms
= extract_autos (type
);
26351 tparms
= make_tree_vec (1);
26352 TREE_VEC_ELT (tparms
, 0)
26353 = build_tree_list (NULL_TREE
, TYPE_NAME (auto_node
));
26356 targs
= make_tree_vec (TREE_VEC_LENGTH (tparms
));
26357 int val
= type_unification_real (tparms
, targs
, parms
, &init
, 1, 0,
26358 DEDUCE_CALL
, LOOKUP_NORMAL
,
26359 NULL
, /*explain_p=*/false);
26362 if (processing_template_decl
)
26363 /* Try again at instantiation time. */
26365 if (type
&& type
!= error_mark_node
26366 && (complain
& tf_error
))
26367 /* If type is error_mark_node a diagnostic must have been
26368 emitted by now. Also, having a mention to '<type error>'
26369 in the diagnostic is not really useful to the user. */
26371 if (cfun
&& auto_node
== current_function_auto_return_pattern
26372 && LAMBDA_FUNCTION_P (current_function_decl
))
26373 error ("unable to deduce lambda return type from %qE", init
);
26375 error ("unable to deduce %qT from %qE", type
, init
);
26376 type_unification_real (tparms
, targs
, parms
, &init
, 1, 0,
26377 DEDUCE_CALL
, LOOKUP_NORMAL
,
26378 NULL
, /*explain_p=*/true);
26380 return error_mark_node
;
26384 /* Check any placeholder constraints against the deduced type. */
26385 if (flag_concepts
&& !processing_template_decl
)
26386 if (tree constr
= PLACEHOLDER_TYPE_CONSTRAINTS (auto_node
))
26388 /* Use the deduced type to check the associated constraints. If we
26389 have a partial-concept-id, rebuild the argument list so that
26390 we check using the extra arguments. */
26391 gcc_assert (TREE_CODE (constr
) == CHECK_CONSTR
);
26392 tree cargs
= CHECK_CONSTR_ARGS (constr
);
26393 if (TREE_VEC_LENGTH (cargs
) > 1)
26395 cargs
= copy_node (cargs
);
26396 TREE_VEC_ELT (cargs
, 0) = TREE_VEC_ELT (targs
, 0);
26400 if (!constraints_satisfied_p (constr
, cargs
))
26402 if (complain
& tf_warning_or_error
)
26406 case adc_unspecified
:
26408 error("placeholder constraints not satisfied");
26410 case adc_variable_type
:
26411 case adc_decomp_type
:
26412 error ("deduced initializer does not satisfy "
26413 "placeholder constraints");
26415 case adc_return_type
:
26416 error ("deduced return type does not satisfy "
26417 "placeholder constraints");
26419 case adc_requirement
:
26420 error ("deduced expression type does not satisfy "
26421 "placeholder constraints");
26424 diagnose_constraints (input_location
, constr
, targs
);
26426 return error_mark_node
;
26430 if (processing_template_decl
&& context
!= adc_unify
)
26431 outer_targs
= current_template_args ();
26432 targs
= add_to_template_args (outer_targs
, targs
);
26433 return tsubst (type
, targs
, complain
, NULL_TREE
);
26436 /* Substitutes LATE_RETURN_TYPE for 'auto' in TYPE and returns the
26440 splice_late_return_type (tree type
, tree late_return_type
)
26442 if (is_auto (type
))
26444 if (late_return_type
)
26445 return late_return_type
;
26447 tree idx
= get_template_parm_index (type
);
26448 if (TEMPLATE_PARM_LEVEL (idx
) <= processing_template_decl
)
26449 /* In an abbreviated function template we didn't know we were dealing
26450 with a function template when we saw the auto return type, so update
26451 it to have the correct level. */
26452 return make_auto_1 (TYPE_IDENTIFIER (type
), true);
26457 /* Returns true iff TYPE is a TEMPLATE_TYPE_PARM representing 'auto' or
26458 'decltype(auto)' or a deduced class template. */
26461 is_auto (const_tree type
)
26463 if (TREE_CODE (type
) == TEMPLATE_TYPE_PARM
26464 && (TYPE_IDENTIFIER (type
) == auto_identifier
26465 || TYPE_IDENTIFIER (type
) == decltype_auto_identifier
26466 || CLASS_PLACEHOLDER_TEMPLATE (type
)))
26472 /* for_each_template_parm callback for type_uses_auto. */
26475 is_auto_r (tree tp
, void */
*data*/
)
26477 return is_auto (tp
);
26480 /* Returns the TEMPLATE_TYPE_PARM in TYPE representing `auto' iff TYPE contains
26481 a use of `auto'. Returns NULL_TREE otherwise. */
26484 type_uses_auto (tree type
)
26486 if (type
== NULL_TREE
)
26488 else if (flag_concepts
)
26490 /* The Concepts TS allows multiple autos in one type-specifier; just
26491 return the first one we find, do_auto_deduction will collect all of
26493 if (uses_template_parms (type
))
26494 return for_each_template_parm (type
, is_auto_r
, /*data*/NULL
,
26495 /*visited*/NULL
, /*nondeduced*/true);
26500 return find_type_usage (type
, is_auto
);
26503 /* For a given template T, return the vector of typedefs referenced
26504 in T for which access check is needed at T instantiation time.
26505 T is either a FUNCTION_DECL or a RECORD_TYPE.
26506 Those typedefs were added to T by the function
26507 append_type_to_template_for_access_check. */
26509 vec
<qualified_typedef_usage_t
, va_gc
> *
26510 get_types_needing_access_check (tree t
)
26513 vec
<qualified_typedef_usage_t
, va_gc
> *result
= NULL
;
26515 if (!t
|| t
== error_mark_node
)
26518 if (!(ti
= get_template_info (t
)))
26521 if (CLASS_TYPE_P (t
)
26522 || TREE_CODE (t
) == FUNCTION_DECL
)
26524 if (!TI_TEMPLATE (ti
))
26527 result
= TI_TYPEDEFS_NEEDING_ACCESS_CHECKING (ti
);
26533 /* Append the typedef TYPE_DECL used in template T to a list of typedefs
26534 tied to T. That list of typedefs will be access checked at
26535 T instantiation time.
26536 T is either a FUNCTION_DECL or a RECORD_TYPE.
26537 TYPE_DECL is a TYPE_DECL node representing a typedef.
26538 SCOPE is the scope through which TYPE_DECL is accessed.
26539 LOCATION is the location of the usage point of TYPE_DECL.
26541 This function is a subroutine of
26542 append_type_to_template_for_access_check. */
26545 append_type_to_template_for_access_check_1 (tree t
,
26548 location_t location
)
26550 qualified_typedef_usage_t typedef_usage
;
26553 if (!t
|| t
== error_mark_node
)
26556 gcc_assert ((TREE_CODE (t
) == FUNCTION_DECL
26557 || CLASS_TYPE_P (t
))
26559 && TREE_CODE (type_decl
) == TYPE_DECL
26562 if (!(ti
= get_template_info (t
)))
26565 gcc_assert (TI_TEMPLATE (ti
));
26567 typedef_usage
.typedef_decl
= type_decl
;
26568 typedef_usage
.context
= scope
;
26569 typedef_usage
.locus
= location
;
26571 vec_safe_push (TI_TYPEDEFS_NEEDING_ACCESS_CHECKING (ti
), typedef_usage
);
26574 /* Append TYPE_DECL to the template TEMPL.
26575 TEMPL is either a class type, a FUNCTION_DECL or a a TEMPLATE_DECL.
26576 At TEMPL instanciation time, TYPE_DECL will be checked to see
26577 if it can be accessed through SCOPE.
26578 LOCATION is the location of the usage point of TYPE_DECL.
26580 e.g. consider the following code snippet:
26587 template<class U> struct S
26589 C::myint mi; // <-- usage point of the typedef C::myint
26594 At S<char> instantiation time, we need to check the access of C::myint
26595 In other words, we need to check the access of the myint typedef through
26596 the C scope. For that purpose, this function will add the myint typedef
26597 and the scope C through which its being accessed to a list of typedefs
26598 tied to the template S. That list will be walked at template instantiation
26599 time and access check performed on each typedefs it contains.
26600 Note that this particular code snippet should yield an error because
26601 myint is private to C. */
26604 append_type_to_template_for_access_check (tree templ
,
26607 location_t location
)
26609 qualified_typedef_usage_t
*iter
;
26612 gcc_assert (type_decl
&& (TREE_CODE (type_decl
) == TYPE_DECL
));
26614 /* Make sure we don't append the type to the template twice. */
26615 FOR_EACH_VEC_SAFE_ELT (get_types_needing_access_check (templ
), i
, iter
)
26616 if (iter
->typedef_decl
== type_decl
&& scope
== iter
->context
)
26619 append_type_to_template_for_access_check_1 (templ
, type_decl
,
26623 /* Convert the generic type parameters in PARM that match the types given in the
26624 range [START_IDX, END_IDX) from the current_template_parms into generic type
26628 convert_generic_types_to_packs (tree parm
, int start_idx
, int end_idx
)
26630 tree current
= current_template_parms
;
26631 int depth
= TMPL_PARMS_DEPTH (current
);
26632 current
= INNERMOST_TEMPLATE_PARMS (current
);
26633 tree replacement
= make_tree_vec (TREE_VEC_LENGTH (current
));
26635 for (int i
= 0; i
< start_idx
; ++i
)
26636 TREE_VEC_ELT (replacement
, i
)
26637 = TREE_TYPE (TREE_VALUE (TREE_VEC_ELT (current
, i
)));
26639 for (int i
= start_idx
; i
< end_idx
; ++i
)
26641 /* Create a distinct parameter pack type from the current parm and add it
26642 to the replacement args to tsubst below into the generic function
26645 tree o
= TREE_TYPE (TREE_VALUE
26646 (TREE_VEC_ELT (current
, i
)));
26647 tree t
= copy_type (o
);
26648 TEMPLATE_TYPE_PARM_INDEX (t
)
26649 = reduce_template_parm_level (TEMPLATE_TYPE_PARM_INDEX (o
),
26651 TREE_TYPE (TEMPLATE_TYPE_DECL (t
)) = t
;
26652 TYPE_STUB_DECL (t
) = TYPE_NAME (t
) = TEMPLATE_TYPE_DECL (t
);
26653 TYPE_MAIN_VARIANT (t
) = t
;
26654 TEMPLATE_TYPE_PARAMETER_PACK (t
) = true;
26655 TYPE_CANONICAL (t
) = canonical_type_parameter (t
);
26656 TREE_VEC_ELT (replacement
, i
) = t
;
26657 TREE_VALUE (TREE_VEC_ELT (current
, i
)) = TREE_CHAIN (t
);
26660 for (int i
= end_idx
, e
= TREE_VEC_LENGTH (current
); i
< e
; ++i
)
26661 TREE_VEC_ELT (replacement
, i
)
26662 = TREE_TYPE (TREE_VALUE (TREE_VEC_ELT (current
, i
)));
26664 /* If there are more levels then build up the replacement with the outer
26667 replacement
= add_to_template_args (template_parms_to_args
26668 (TREE_CHAIN (current_template_parms
)),
26671 return tsubst (parm
, replacement
, tf_none
, NULL_TREE
);
26674 /* Entries in the decl_constraint hash table. */
26675 struct GTY((for_user
)) constr_entry
26681 /* Hashing function and equality for constraint entries. */
26682 struct constr_hasher
: ggc_ptr_hash
<constr_entry
>
26684 static hashval_t
hash (constr_entry
*e
)
26686 return (hashval_t
)DECL_UID (e
->decl
);
26689 static bool equal (constr_entry
*e1
, constr_entry
*e2
)
26691 return e1
->decl
== e2
->decl
;
26695 /* A mapping from declarations to constraint information. Note that
26696 both templates and their underlying declarations are mapped to the
26697 same constraint information.
26699 FIXME: This is defined in pt.c because garbage collection
26700 code is not being generated for constraint.cc. */
26702 static GTY (()) hash_table
<constr_hasher
> *decl_constraints
;
26704 /* Returns the template constraints of declaration T. If T is not
26705 constrained, return NULL_TREE. Note that T must be non-null. */
26708 get_constraints (tree t
)
26710 if (!flag_concepts
)
26713 gcc_assert (DECL_P (t
));
26714 if (TREE_CODE (t
) == TEMPLATE_DECL
)
26715 t
= DECL_TEMPLATE_RESULT (t
);
26716 constr_entry elt
= { t
, NULL_TREE
};
26717 constr_entry
* found
= decl_constraints
->find (&elt
);
26724 /* Associate the given constraint information CI with the declaration
26725 T. If T is a template, then the constraints are associated with
26726 its underlying declaration. Don't build associations if CI is
26730 set_constraints (tree t
, tree ci
)
26734 gcc_assert (t
&& flag_concepts
);
26735 if (TREE_CODE (t
) == TEMPLATE_DECL
)
26736 t
= DECL_TEMPLATE_RESULT (t
);
26737 gcc_assert (!get_constraints (t
));
26738 constr_entry elt
= {t
, ci
};
26739 constr_entry
** slot
= decl_constraints
->find_slot (&elt
, INSERT
);
26740 constr_entry
* entry
= ggc_alloc
<constr_entry
> ();
26745 /* Remove the associated constraints of the declaration T. */
26748 remove_constraints (tree t
)
26750 gcc_assert (DECL_P (t
));
26751 if (TREE_CODE (t
) == TEMPLATE_DECL
)
26752 t
= DECL_TEMPLATE_RESULT (t
);
26754 constr_entry elt
= {t
, NULL_TREE
};
26755 constr_entry
** slot
= decl_constraints
->find_slot (&elt
, NO_INSERT
);
26757 decl_constraints
->clear_slot (slot
);
26760 /* Memoized satisfaction results for declarations. This
26761 maps the pair (constraint_info, arguments) to the result computed
26762 by constraints_satisfied_p. */
26764 struct GTY((for_user
)) constraint_sat_entry
26771 /* Hashing function and equality for constraint entries. */
26773 struct constraint_sat_hasher
: ggc_ptr_hash
<constraint_sat_entry
>
26775 static hashval_t
hash (constraint_sat_entry
*e
)
26777 hashval_t val
= iterative_hash_object(e
->ci
, 0);
26778 return iterative_hash_template_arg (e
->args
, val
);
26781 static bool equal (constraint_sat_entry
*e1
, constraint_sat_entry
*e2
)
26783 return e1
->ci
== e2
->ci
&& comp_template_args (e1
->args
, e2
->args
);
26787 /* Memoized satisfaction results for concept checks. */
26789 struct GTY((for_user
)) concept_spec_entry
26796 /* Hashing function and equality for constraint entries. */
26798 struct concept_spec_hasher
: ggc_ptr_hash
<concept_spec_entry
>
26800 static hashval_t
hash (concept_spec_entry
*e
)
26802 return hash_tmpl_and_args (e
->tmpl
, e
->args
);
26805 static bool equal (concept_spec_entry
*e1
, concept_spec_entry
*e2
)
26807 ++comparing_specializations
;
26808 bool eq
= e1
->tmpl
== e2
->tmpl
&& comp_template_args (e1
->args
, e2
->args
);
26809 --comparing_specializations
;
26814 static GTY (()) hash_table
<constraint_sat_hasher
> *constraint_memos
;
26815 static GTY (()) hash_table
<concept_spec_hasher
> *concept_memos
;
26817 /* Search for a memoized satisfaction result. Returns one of the
26818 truth value nodes if previously memoized, or NULL_TREE otherwise. */
26821 lookup_constraint_satisfaction (tree ci
, tree args
)
26823 constraint_sat_entry elt
= { ci
, args
, NULL_TREE
};
26824 constraint_sat_entry
* found
= constraint_memos
->find (&elt
);
26826 return found
->result
;
26831 /* Memoize the result of a satisfication test. Returns the saved result. */
26834 memoize_constraint_satisfaction (tree ci
, tree args
, tree result
)
26836 constraint_sat_entry elt
= {ci
, args
, result
};
26837 constraint_sat_entry
** slot
= constraint_memos
->find_slot (&elt
, INSERT
);
26838 constraint_sat_entry
* entry
= ggc_alloc
<constraint_sat_entry
> ();
26844 /* Search for a memoized satisfaction result for a concept. */
26847 lookup_concept_satisfaction (tree tmpl
, tree args
)
26849 concept_spec_entry elt
= { tmpl
, args
, NULL_TREE
};
26850 concept_spec_entry
* found
= concept_memos
->find (&elt
);
26852 return found
->result
;
26857 /* Memoize the result of a concept check. Returns the saved result. */
26860 memoize_concept_satisfaction (tree tmpl
, tree args
, tree result
)
26862 concept_spec_entry elt
= {tmpl
, args
, result
};
26863 concept_spec_entry
** slot
= concept_memos
->find_slot (&elt
, INSERT
);
26864 concept_spec_entry
* entry
= ggc_alloc
<concept_spec_entry
> ();
26870 static GTY (()) hash_table
<concept_spec_hasher
> *concept_expansions
;
26872 /* Returns a prior concept specialization. This returns the substituted
26873 and normalized constraints defined by the concept. */
26876 get_concept_expansion (tree tmpl
, tree args
)
26878 concept_spec_entry elt
= { tmpl
, args
, NULL_TREE
};
26879 concept_spec_entry
* found
= concept_expansions
->find (&elt
);
26881 return found
->result
;
26886 /* Save a concept expansion for later. */
26889 save_concept_expansion (tree tmpl
, tree args
, tree def
)
26891 concept_spec_entry elt
= {tmpl
, args
, def
};
26892 concept_spec_entry
** slot
= concept_expansions
->find_slot (&elt
, INSERT
);
26893 concept_spec_entry
* entry
= ggc_alloc
<concept_spec_entry
> ();
26900 hash_subsumption_args (tree t1
, tree t2
)
26902 gcc_assert (TREE_CODE (t1
) == CHECK_CONSTR
);
26903 gcc_assert (TREE_CODE (t2
) == CHECK_CONSTR
);
26905 val
= iterative_hash_object (CHECK_CONSTR_CONCEPT (t1
), val
);
26906 val
= iterative_hash_template_arg (CHECK_CONSTR_ARGS (t1
), val
);
26907 val
= iterative_hash_object (CHECK_CONSTR_CONCEPT (t2
), val
);
26908 val
= iterative_hash_template_arg (CHECK_CONSTR_ARGS (t2
), val
);
26912 /* Compare the constraints of two subsumption entries. The LEFT1 and
26913 LEFT2 arguments comprise the first subsumption pair and the RIGHT1
26914 and RIGHT2 arguments comprise the second. These are all CHECK_CONSTRs. */
26917 comp_subsumption_args (tree left1
, tree left2
, tree right1
, tree right2
)
26919 if (CHECK_CONSTR_CONCEPT (left1
) == CHECK_CONSTR_CONCEPT (right1
))
26920 if (CHECK_CONSTR_CONCEPT (left2
) == CHECK_CONSTR_CONCEPT (right2
))
26921 if (comp_template_args (CHECK_CONSTR_ARGS (left1
),
26922 CHECK_CONSTR_ARGS (right1
)))
26923 return comp_template_args (CHECK_CONSTR_ARGS (left2
),
26924 CHECK_CONSTR_ARGS (right2
));
26928 /* Key/value pair for learning and memoizing subsumption results. This
26929 associates a pair of check constraints (including arguments) with
26930 a boolean value indicating the result. */
26932 struct GTY((for_user
)) subsumption_entry
26939 /* Hashing function and equality for constraint entries. */
26941 struct subsumption_hasher
: ggc_ptr_hash
<subsumption_entry
>
26943 static hashval_t
hash (subsumption_entry
*e
)
26945 return hash_subsumption_args (e
->t1
, e
->t2
);
26948 static bool equal (subsumption_entry
*e1
, subsumption_entry
*e2
)
26950 ++comparing_specializations
;
26951 bool eq
= comp_subsumption_args(e1
->t1
, e1
->t2
, e2
->t1
, e2
->t2
);
26952 --comparing_specializations
;
26957 static GTY (()) hash_table
<subsumption_hasher
> *subsumption_table
;
26959 /* Search for a previously cached subsumption result. */
26962 lookup_subsumption_result (tree t1
, tree t2
)
26964 subsumption_entry elt
= { t1
, t2
, false };
26965 subsumption_entry
* found
= subsumption_table
->find (&elt
);
26967 return &found
->result
;
26972 /* Save a subsumption result. */
26975 save_subsumption_result (tree t1
, tree t2
, bool result
)
26977 subsumption_entry elt
= {t1
, t2
, result
};
26978 subsumption_entry
** slot
= subsumption_table
->find_slot (&elt
, INSERT
);
26979 subsumption_entry
* entry
= ggc_alloc
<subsumption_entry
> ();
26985 /* Set up the hash table for constraint association. */
26988 init_constraint_processing (void)
26990 if (!flag_concepts
)
26993 decl_constraints
= hash_table
<constr_hasher
>::create_ggc(37);
26994 constraint_memos
= hash_table
<constraint_sat_hasher
>::create_ggc(37);
26995 concept_memos
= hash_table
<concept_spec_hasher
>::create_ggc(37);
26996 concept_expansions
= hash_table
<concept_spec_hasher
>::create_ggc(37);
26997 subsumption_table
= hash_table
<subsumption_hasher
>::create_ggc(37);
27000 /* __integer_pack(N) in a pack expansion expands to a sequence of numbers from
27004 declare_integer_pack (void)
27006 tree ipfn
= push_library_fn (get_identifier ("__integer_pack"),
27007 build_function_type_list (integer_type_node
,
27010 NULL_TREE
, ECF_CONST
);
27011 DECL_DECLARED_CONSTEXPR_P (ipfn
) = true;
27012 DECL_BUILT_IN_CLASS (ipfn
) = BUILT_IN_FRONTEND
;
27015 /* Set up the hash tables for template instantiations. */
27018 init_template_processing (void)
27020 decl_specializations
= hash_table
<spec_hasher
>::create_ggc (37);
27021 type_specializations
= hash_table
<spec_hasher
>::create_ggc (37);
27023 if (cxx_dialect
>= cxx11
)
27024 declare_integer_pack ();
27027 /* Print stats about the template hash tables for -fstats. */
27030 print_template_statistics (void)
27032 fprintf (stderr
, "decl_specializations: size %ld, %ld elements, "
27033 "%f collisions\n", (long) decl_specializations
->size (),
27034 (long) decl_specializations
->elements (),
27035 decl_specializations
->collisions ());
27036 fprintf (stderr
, "type_specializations: size %ld, %ld elements, "
27037 "%f collisions\n", (long) type_specializations
->size (),
27038 (long) type_specializations
->elements (),
27039 type_specializations
->collisions ());
27044 namespace selftest
{
27046 /* Verify that build_non_dependent_expr () works, for various expressions,
27047 and that location wrappers don't affect the results. */
27050 test_build_non_dependent_expr ()
27052 location_t loc
= BUILTINS_LOCATION
;
27054 /* Verify constants, without and with location wrappers. */
27055 tree int_cst
= build_int_cst (integer_type_node
, 42);
27056 ASSERT_EQ (int_cst
, build_non_dependent_expr (int_cst
));
27058 tree wrapped_int_cst
= maybe_wrap_with_location (int_cst
, loc
);
27059 ASSERT_TRUE (location_wrapper_p (wrapped_int_cst
));
27060 ASSERT_EQ (wrapped_int_cst
, build_non_dependent_expr (wrapped_int_cst
));
27062 tree string_lit
= build_string (4, "foo");
27063 TREE_TYPE (string_lit
) = char_array_type_node
;
27064 string_lit
= fix_string_type (string_lit
);
27065 ASSERT_EQ (string_lit
, build_non_dependent_expr (string_lit
));
27067 tree wrapped_string_lit
= maybe_wrap_with_location (string_lit
, loc
);
27068 ASSERT_TRUE (location_wrapper_p (wrapped_string_lit
));
27069 ASSERT_EQ (wrapped_string_lit
,
27070 build_non_dependent_expr (wrapped_string_lit
));
27073 /* Verify that type_dependent_expression_p () works correctly, even
27074 in the presence of location wrapper nodes. */
27077 test_type_dependent_expression_p ()
27079 location_t loc
= BUILTINS_LOCATION
;
27081 tree name
= get_identifier ("foo");
27083 /* If no templates are involved, nothing is type-dependent. */
27084 gcc_assert (!processing_template_decl
);
27085 ASSERT_FALSE (type_dependent_expression_p (name
));
27087 ++processing_template_decl
;
27089 /* Within a template, an unresolved name is always type-dependent. */
27090 ASSERT_TRUE (type_dependent_expression_p (name
));
27092 /* Ensure it copes with NULL_TREE and errors. */
27093 ASSERT_FALSE (type_dependent_expression_p (NULL_TREE
));
27094 ASSERT_FALSE (type_dependent_expression_p (error_mark_node
));
27096 /* A USING_DECL in a template should be type-dependent, even if wrapped
27097 with a location wrapper (PR c++/83799). */
27098 tree using_decl
= build_lang_decl (USING_DECL
, name
, NULL_TREE
);
27099 TREE_TYPE (using_decl
) = integer_type_node
;
27100 ASSERT_TRUE (type_dependent_expression_p (using_decl
));
27101 tree wrapped_using_decl
= maybe_wrap_with_location (using_decl
, loc
);
27102 ASSERT_TRUE (location_wrapper_p (wrapped_using_decl
));
27103 ASSERT_TRUE (type_dependent_expression_p (wrapped_using_decl
));
27105 --processing_template_decl
;
27108 /* Run all of the selftests within this file. */
27113 test_build_non_dependent_expr ();
27114 test_type_dependent_expression_p ();
27117 } // namespace selftest
27119 #endif /* #if CHECKING_P */
27121 #include "gt-cp-pt.h"