1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988-2018 Free Software Foundation, Inc.
3 Contributed by Michael Tiemann (tiemann@cygnus.com)
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3, or (at your option)
12 GCC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
22 /* Process declarations and symbol lookup for C++ front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
31 #include "coretypes.h"
33 #include "c-family/c-target.h"
36 #include "stringpool.h"
38 #include "stor-layout.h"
42 #include "tree-iterator.h"
46 #include "c-family/c-objc.h"
47 #include "c-family/c-pragma.h"
48 #include "c-family/c-ubsan.h"
55 /* Possible cases of bad specifiers type used by bad_specifiers. */
57 BSP_VAR
, /* variable */
58 BSP_PARM
, /* parameter */
63 static const char *redeclaration_error_message (tree
, tree
);
65 static int decl_jump_unsafe (tree
);
66 static void require_complete_types_for_parms (tree
);
67 static void push_local_name (tree
);
68 static tree
grok_reference_init (tree
, tree
, tree
, int);
69 static tree
grokvardecl (tree
, tree
, tree
, const cp_decl_specifier_seq
*,
70 int, int, int, bool, int, tree
);
71 static int check_static_variable_definition (tree
, tree
);
72 static void record_unknown_type (tree
, const char *);
73 static tree
builtin_function_1 (tree
, tree
, bool);
74 static int member_function_or_else (tree
, tree
, enum overload_flags
);
75 static tree
local_variable_p_walkfn (tree
*, int *, void *);
76 static const char *tag_name (enum tag_types
);
77 static tree
lookup_and_check_tag (enum tag_types
, tree
, tag_scope
, bool);
78 static void maybe_deduce_size_from_array_init (tree
, tree
);
79 static void layout_var_decl (tree
);
80 static tree
check_initializer (tree
, tree
, int, vec
<tree
, va_gc
> **);
81 static void make_rtl_for_nonlocal_decl (tree
, tree
, const char *);
82 static void save_function_data (tree
);
83 static void copy_type_enum (tree
, tree
);
84 static void check_function_type (tree
, tree
);
85 static void finish_constructor_body (void);
86 static void begin_destructor_body (void);
87 static void finish_destructor_body (void);
88 static void record_key_method_defined (tree
);
89 static tree
create_array_type_for_decl (tree
, tree
, tree
);
90 static tree
get_atexit_node (void);
91 static tree
get_dso_handle_node (void);
92 static tree
start_cleanup_fn (void);
93 static void end_cleanup_fn (void);
94 static tree
cp_make_fname_decl (location_t
, tree
, int);
95 static void initialize_predefined_identifiers (void);
96 static tree check_special_function_return_type
97 (special_function_kind
, tree
, tree
, int, const location_t
*);
98 static tree
push_cp_library_fn (enum tree_code
, tree
, int);
99 static tree
build_cp_library_fn (tree
, enum tree_code
, tree
, int);
100 static void store_parm_decls (tree
);
101 static void initialize_local_var (tree
, tree
);
102 static void expand_static_init (tree
, tree
);
104 /* The following symbols are subsumed in the cp_global_trees array, and
105 listed here individually for documentation purposes.
108 tree wchar_decl_node;
110 tree vtable_entry_type;
111 tree delta_type_node;
112 tree __t_desc_type_node;
114 tree class_type_node;
115 tree unknown_type_node;
117 Array type `vtable_entry_type[]'
120 tree vtbl_ptr_type_node;
127 A FUNCTION_DECL which can call `abort'. Not necessarily the
128 one that the user will declare, but sufficient to be called
129 by routines that want to abort the program.
134 tree type_info_type_node, tinfo_decl_id, tinfo_decl_type;
135 tree tinfo_var_id; */
137 tree cp_global_trees
[CPTI_MAX
];
139 #define local_names cp_function_chain->x_local_names
141 /* A list of objects which have constructors or destructors
142 which reside in the global scope. The decl is stored in
143 the TREE_VALUE slot and the initializer is stored
144 in the TREE_PURPOSE slot. */
145 tree static_aggregates
;
147 /* Like static_aggregates, but for thread_local variables. */
152 /* A node for the integer constant 2. */
154 tree integer_two_node
;
156 /* vector of static decls. */
157 vec
<tree
, va_gc
> *static_decls
;
159 /* vector of keyed classes. */
160 vec
<tree
, va_gc
> *keyed_classes
;
162 /* Used only for jumps to as-yet undefined labels, since jumps to
163 defined labels can have their validity checked immediately. */
165 struct GTY((chain_next ("%h.next"))) named_label_use_entry
{
166 struct named_label_use_entry
*next
;
167 /* The binding level to which this entry is *currently* attached.
168 This is initially the binding level in which the goto appeared,
169 but is modified as scopes are closed. */
170 cp_binding_level
*binding_level
;
171 /* The head of the names list that was current when the goto appeared,
172 or the inner scope popped. These are the decls that will *not* be
173 skipped when jumping to the label. */
175 /* The location of the goto, for error reporting. */
176 location_t o_goto_locus
;
177 /* True if an OpenMP structured block scope has been closed since
178 the goto appeared. This means that the branch from the label will
179 illegally exit an OpenMP scope. */
183 /* A list of all LABEL_DECLs in the function that have names. Here so
184 we can clear out their names' definitions at the end of the
185 function, and so we can check the validity of jumps to these labels. */
187 struct GTY((for_user
)) named_label_entry
{
189 tree name
; /* Name of decl. */
191 tree label_decl
; /* LABEL_DECL, unless deleted local label. */
193 named_label_entry
*outer
; /* Outer shadowed chain. */
195 /* The binding level to which the label is *currently* attached.
196 This is initially set to the binding level in which the label
197 is defined, but is modified as scopes are closed. */
198 cp_binding_level
*binding_level
;
200 /* The head of the names list that was current when the label was
201 defined, or the inner scope popped. These are the decls that will
202 be skipped when jumping to the label. */
205 /* A vector of all decls from all binding levels that would be
206 crossed by a backward branch to the label. */
207 vec
<tree
, va_gc
> *bad_decls
;
209 /* A list of uses of the label, before the label is defined. */
210 named_label_use_entry
*uses
;
212 /* The following bits are set after the label is defined, and are
213 updated as scopes are popped. They indicate that a jump to the
214 label will illegally enter a scope of the given flavor. */
218 bool in_transaction_scope
;
219 bool in_constexpr_if
;
222 #define named_labels cp_function_chain->x_named_labels
224 /* The number of function bodies which we are currently processing.
225 (Zero if we are at namespace scope, one inside the body of a
226 function, two inside the body of a function in a local class, etc.) */
229 /* Whether the exception-specifier is part of a function type (i.e. C++17). */
230 bool flag_noexcept_type
;
232 /* States indicating how grokdeclarator() should handle declspecs marked
233 with __attribute__((deprecated)). An object declared as
234 __attribute__((deprecated)) suppresses warnings of uses of other
236 enum deprecated_states deprecated_state
= DEPRECATED_NORMAL
;
239 /* A list of VAR_DECLs whose type was incomplete at the time the
240 variable was declared. */
242 struct GTY(()) incomplete_var
{
244 tree incomplete_type
;
248 static GTY(()) vec
<incomplete_var
, va_gc
> *incomplete_vars
;
250 /* Returns the kind of template specialization we are currently
251 processing, given that it's declaration contained N_CLASS_SCOPES
252 explicit scope qualifications. */
255 current_tmpl_spec_kind (int n_class_scopes
)
257 int n_template_parm_scopes
= 0;
258 int seen_specialization_p
= 0;
259 int innermost_specialization_p
= 0;
262 /* Scan through the template parameter scopes. */
263 for (b
= current_binding_level
;
264 b
->kind
== sk_template_parms
;
267 /* If we see a specialization scope inside a parameter scope,
268 then something is wrong. That corresponds to a declaration
271 template <class T> template <> ...
273 which is always invalid since [temp.expl.spec] forbids the
274 specialization of a class member template if the enclosing
275 class templates are not explicitly specialized as well. */
276 if (b
->explicit_spec_p
)
278 if (n_template_parm_scopes
== 0)
279 innermost_specialization_p
= 1;
281 seen_specialization_p
= 1;
283 else if (seen_specialization_p
== 1)
284 return tsk_invalid_member_spec
;
286 ++n_template_parm_scopes
;
289 /* Handle explicit instantiations. */
290 if (processing_explicit_instantiation
)
292 if (n_template_parm_scopes
!= 0)
293 /* We've seen a template parameter list during an explicit
294 instantiation. For example:
296 template <class T> template void f(int);
298 This is erroneous. */
299 return tsk_invalid_expl_inst
;
301 return tsk_expl_inst
;
304 if (n_template_parm_scopes
< n_class_scopes
)
305 /* We've not seen enough template headers to match all the
306 specialized classes present. For example:
308 template <class T> void R<T>::S<T>::f(int);
310 This is invalid; there needs to be one set of template
311 parameters for each class. */
312 return tsk_insufficient_parms
;
313 else if (n_template_parm_scopes
== n_class_scopes
)
314 /* We're processing a non-template declaration (even though it may
315 be a member of a template class.) For example:
317 template <class T> void S<T>::f(int);
319 The `class T' matches the `S<T>', leaving no template headers
320 corresponding to the `f'. */
322 else if (n_template_parm_scopes
> n_class_scopes
+ 1)
323 /* We've got too many template headers. For example:
325 template <> template <class T> void f (T);
327 There need to be more enclosing classes. */
328 return tsk_excessive_parms
;
330 /* This must be a template. It's of the form:
332 template <class T> template <class U> void S<T>::f(U);
334 This is a specialization if the innermost level was a
335 specialization; otherwise it's just a definition of the
337 return innermost_specialization_p
? tsk_expl_spec
: tsk_template
;
340 /* Exit the current scope. */
348 /* When a label goes out of scope, check to see if that label was used
349 in a valid manner, and issue any appropriate warnings or errors. */
352 check_label_used (tree label
)
354 if (!processing_template_decl
)
356 if (DECL_INITIAL (label
) == NULL_TREE
)
360 error ("label %q+D used but not defined", label
);
361 location
= input_location
;
362 /* FIXME want (LOCATION_FILE (input_location), (line)0) */
363 /* Avoid crashing later. */
364 define_label (location
, DECL_NAME (label
));
367 warn_for_unused_label (label
);
371 /* Helper function to sort named label entries in a vector by DECL_UID. */
374 sort_labels (const void *a
, const void *b
)
376 tree label1
= *(tree
const *) a
;
377 tree label2
= *(tree
const *) b
;
379 /* DECL_UIDs can never be equal. */
380 return DECL_UID (label1
) > DECL_UID (label2
) ? -1 : +1;
383 /* At the end of a function, all labels declared within the function
384 go out of scope. BLOCK is the top-level block for the
388 pop_labels (tree block
)
393 /* We need to add the labels to the block chain, so debug
394 information is emitted. But, we want the order to be stable so
395 need to sort them first. Otherwise the debug output could be
396 randomly ordered. I guess it's mostly stable, unless the hash
397 table implementation changes. */
398 auto_vec
<tree
, 32> labels (named_labels
->elements ());
399 hash_table
<named_label_hash
>::iterator
end (named_labels
->end ());
400 for (hash_table
<named_label_hash
>::iterator iter
401 (named_labels
->begin ()); iter
!= end
; ++iter
)
403 named_label_entry
*ent
= *iter
;
405 gcc_checking_assert (!ent
->outer
);
407 labels
.quick_push (ent
->label_decl
);
411 labels
.qsort (sort_labels
);
413 while (labels
.length ())
415 tree label
= labels
.pop ();
417 DECL_CHAIN (label
) = BLOCK_VARS (block
);
418 BLOCK_VARS (block
) = label
;
420 check_label_used (label
);
424 /* At the end of a block with local labels, restore the outer definition. */
427 pop_local_label (tree id
, tree label
)
429 check_label_used (label
);
430 named_label_entry
**slot
= named_labels
->find_slot_with_hash
431 (id
, IDENTIFIER_HASH_VALUE (id
), NO_INSERT
);
432 named_label_entry
*ent
= *slot
;
438 ent
= ggc_cleared_alloc
<named_label_entry
> ();
444 /* The following two routines are used to interface to Objective-C++.
445 The binding level is purposely treated as an opaque type. */
448 objc_get_current_scope (void)
450 return current_binding_level
;
453 /* The following routine is used by the NeXT-style SJLJ exceptions;
454 variables get marked 'volatile' so as to not be clobbered by
455 _setjmp()/_longjmp() calls. All variables in the current scope,
456 as well as parent scopes up to (but not including) ENCLOSING_BLK
457 shall be thusly marked. */
460 objc_mark_locals_volatile (void *enclosing_blk
)
462 cp_binding_level
*scope
;
464 for (scope
= current_binding_level
;
465 scope
&& scope
!= enclosing_blk
;
466 scope
= scope
->level_chain
)
470 for (decl
= scope
->names
; decl
; decl
= TREE_CHAIN (decl
))
471 objc_volatilize_decl (decl
);
473 /* Do not climb up past the current function. */
474 if (scope
->kind
== sk_function_parms
)
479 /* True if B is the level for the condition of a constexpr if. */
482 level_for_constexpr_if (cp_binding_level
*b
)
484 return (b
->kind
== sk_cond
&& b
->this_entity
485 && TREE_CODE (b
->this_entity
) == IF_STMT
486 && IF_STMT_CONSTEXPR_P (b
->this_entity
));
489 /* Update data for defined and undefined labels when leaving a scope. */
492 poplevel_named_label_1 (named_label_entry
**slot
, cp_binding_level
*bl
)
494 named_label_entry
*ent
= *slot
;
495 cp_binding_level
*obl
= bl
->level_chain
;
497 if (ent
->binding_level
== bl
)
501 /* ENT->NAMES_IN_SCOPE may contain a mixture of DECLs and
502 TREE_LISTs representing OVERLOADs, so be careful. */
503 for (decl
= ent
->names_in_scope
; decl
; decl
= (DECL_P (decl
)
505 : TREE_CHAIN (decl
)))
506 if (decl_jump_unsafe (decl
))
507 vec_safe_push (ent
->bad_decls
, decl
);
509 ent
->binding_level
= obl
;
510 ent
->names_in_scope
= obl
->names
;
514 ent
->in_try_scope
= true;
517 ent
->in_catch_scope
= true;
520 ent
->in_omp_scope
= true;
523 ent
->in_transaction_scope
= true;
526 if (level_for_constexpr_if (bl
->level_chain
))
527 ent
->in_constexpr_if
= true;
535 struct named_label_use_entry
*use
;
537 for (use
= ent
->uses
; use
; use
= use
->next
)
538 if (use
->binding_level
== bl
)
540 use
->binding_level
= obl
;
541 use
->names_in_scope
= obl
->names
;
542 if (bl
->kind
== sk_omp
)
543 use
->in_omp_scope
= true;
550 /* Saved errorcount to avoid -Wunused-but-set-{parameter,variable} warnings
551 when errors were reported, except for -Werror-unused-but-set-*. */
552 static int unused_but_set_errorcount
;
554 /* Exit a binding level.
555 Pop the level off, and restore the state of the identifier-decl mappings
556 that were in effect when this level was entered.
558 If KEEP == 1, this level had explicit declarations, so
559 and create a "block" (a BLOCK node) for the level
560 to record its declarations and subblocks for symbol table output.
562 If FUNCTIONBODY is nonzero, this level is the body of a function,
563 so create a block as if KEEP were set and also clear out all
566 If REVERSE is nonzero, reverse the order of decls before putting
567 them into the BLOCK. */
570 poplevel (int keep
, int reverse
, int functionbody
)
573 /* The chain of decls was accumulated in reverse order.
574 Put it into forward order, just for cleanliness. */
579 int leaving_for_scope
;
583 bool subtime
= timevar_cond_start (TV_NAME_LOOKUP
);
588 gcc_assert (current_binding_level
->kind
!= sk_class
589 && current_binding_level
->kind
!= sk_namespace
);
591 if (current_binding_level
->kind
== sk_cleanup
)
593 subblocks
= functionbody
>= 0 ? current_binding_level
->blocks
: 0;
595 gcc_assert (!vec_safe_length (current_binding_level
->class_shadowed
));
597 /* We used to use KEEP == 2 to indicate that the new block should go
598 at the beginning of the list of blocks at this binding level,
599 rather than the end. This hack is no longer used. */
600 gcc_assert (keep
== 0 || keep
== 1);
602 if (current_binding_level
->keep
)
605 /* Any uses of undefined labels, and any defined labels, now operate
606 under constraints of next binding contour. */
607 if (cfun
&& !functionbody
&& named_labels
)
608 named_labels
->traverse
<cp_binding_level
*, poplevel_named_label_1
>
609 (current_binding_level
);
611 /* Get the decls in the order they were written.
612 Usually current_binding_level->names is in reverse order.
613 But parameter decls were previously put in forward order. */
615 decls
= current_binding_level
->names
;
618 decls
= nreverse (decls
);
619 current_binding_level
->names
= decls
;
622 /* If there were any declarations or structure tags in that level,
623 or if this level is a function body,
624 create a BLOCK to record them for the life of this function. */
626 /* Avoid function body block if possible. */
627 if (functionbody
&& subblocks
&& BLOCK_CHAIN (subblocks
) == NULL_TREE
)
629 else if (keep
== 1 || functionbody
)
630 block
= make_node (BLOCK
);
631 if (block
!= NULL_TREE
)
633 BLOCK_VARS (block
) = decls
;
634 BLOCK_SUBBLOCKS (block
) = subblocks
;
637 /* In each subblock, record that this is its superior. */
639 for (link
= subblocks
; link
; link
= BLOCK_CHAIN (link
))
640 BLOCK_SUPERCONTEXT (link
) = block
;
642 /* We still support the old for-scope rules, whereby the variables
643 in a init statement were in scope after the for-statement ended.
644 We only use the new rules if flag_new_for_scope is nonzero. */
646 = current_binding_level
->kind
== sk_for
&& flag_new_for_scope
;
648 /* Before we remove the declarations first check for unused variables. */
649 if ((warn_unused_variable
|| warn_unused_but_set_variable
)
650 && current_binding_level
->kind
!= sk_template_parms
651 && !processing_template_decl
)
652 for (tree d
= get_local_decls (); d
; d
= TREE_CHAIN (d
))
654 /* There are cases where D itself is a TREE_LIST. See in
655 push_local_binding where the list of decls returned by
656 getdecls is built. */
657 decl
= TREE_CODE (d
) == TREE_LIST
? TREE_VALUE (d
) : d
;
659 tree type
= TREE_TYPE (decl
);
661 && (! TREE_USED (decl
) || !DECL_READ_P (decl
))
662 && ! DECL_IN_SYSTEM_HEADER (decl
)
663 /* For structured bindings, consider only real variables, not
665 && (DECL_DECOMPOSITION_P (decl
) ? !DECL_DECOMP_BASE (decl
)
666 : (DECL_NAME (decl
) && !DECL_ARTIFICIAL (decl
)))
667 && type
!= error_mark_node
668 && (!CLASS_TYPE_P (type
)
669 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
)
670 || lookup_attribute ("warn_unused",
671 TYPE_ATTRIBUTES (TREE_TYPE (decl
)))))
673 if (! TREE_USED (decl
))
675 if (!DECL_NAME (decl
) && DECL_DECOMPOSITION_P (decl
))
676 warning_at (DECL_SOURCE_LOCATION (decl
),
677 OPT_Wunused_variable
,
678 "unused structured binding declaration");
680 warning_at (DECL_SOURCE_LOCATION (decl
),
681 OPT_Wunused_variable
, "unused variable %qD", decl
);
683 else if (DECL_CONTEXT (decl
) == current_function_decl
684 // For -Wunused-but-set-variable leave references alone.
685 && TREE_CODE (TREE_TYPE (decl
)) != REFERENCE_TYPE
686 && errorcount
== unused_but_set_errorcount
)
688 if (!DECL_NAME (decl
) && DECL_DECOMPOSITION_P (decl
))
689 warning_at (DECL_SOURCE_LOCATION (decl
),
690 OPT_Wunused_but_set_variable
, "structured "
691 "binding declaration set but not used");
693 warning_at (DECL_SOURCE_LOCATION (decl
),
694 OPT_Wunused_but_set_variable
,
695 "variable %qD set but not used", decl
);
696 unused_but_set_errorcount
= errorcount
;
701 /* Remove declarations for all the DECLs in this level. */
702 for (link
= decls
; link
; link
= TREE_CHAIN (link
))
704 decl
= TREE_CODE (link
) == TREE_LIST
? TREE_VALUE (link
) : link
;
705 tree name
= OVL_NAME (decl
);
707 if (leaving_for_scope
&& VAR_P (decl
)
708 /* It's hard to make this ARM compatibility hack play nicely with
709 lambdas, and it really isn't necessary in C++11 mode. */
710 && cxx_dialect
< cxx11
713 cxx_binding
*ob
= outer_binding (name
,
714 IDENTIFIER_BINDING (name
),
716 tree ns_binding
= NULL_TREE
;
718 ns_binding
= get_namespace_binding (current_namespace
, name
);
720 if (ob
&& ob
->scope
== current_binding_level
->level_chain
)
721 /* We have something like:
726 and we are leaving the `for' scope. There's no reason to
727 keep the binding of the inner `i' in this case. */
729 else if ((ob
&& (TREE_CODE (ob
->value
) == TYPE_DECL
))
730 || (ns_binding
&& TREE_CODE (ns_binding
) == TYPE_DECL
))
731 /* Here, we have something like:
739 We must pop the for-scope binding so we know what's a
740 type and what isn't. */
744 /* Mark this VAR_DECL as dead so that we can tell we left it
745 there only for backward compatibility. */
746 DECL_DEAD_FOR_LOCAL (link
) = 1;
748 /* Keep track of what should have happened when we
749 popped the binding. */
752 SET_DECL_SHADOWED_FOR_VAR (link
, ob
->value
);
753 DECL_HAS_SHADOWED_FOR_VAR_P (link
) = 1;
756 /* Add it to the list of dead variables in the next
757 outermost binding to that we can remove these when we
758 leave that binding. */
760 current_binding_level
->level_chain
->dead_vars_from_for
,
763 /* Although we don't pop the cxx_binding, we do clear
764 its SCOPE since the scope is going away now. */
765 IDENTIFIER_BINDING (name
)->scope
766 = current_binding_level
->level_chain
;
768 /* Don't remove the binding. */
772 /* Remove the binding. */
773 if (TREE_CODE (decl
) == LABEL_DECL
)
774 pop_local_label (name
, decl
);
776 pop_local_binding (name
, decl
);
779 /* Remove declarations for any `for' variables from inner scopes
780 that we kept around. */
781 FOR_EACH_VEC_SAFE_ELT_REVERSE (current_binding_level
->dead_vars_from_for
,
783 pop_local_binding (DECL_NAME (decl
), decl
);
785 /* Restore the IDENTIFIER_TYPE_VALUEs. */
786 for (link
= current_binding_level
->type_shadowed
;
787 link
; link
= TREE_CHAIN (link
))
788 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (link
), TREE_VALUE (link
));
790 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
791 list if a `using' declaration put them there. The debugging
792 back ends won't understand OVERLOAD, so we remove them here.
793 Because the BLOCK_VARS are (temporarily) shared with
794 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
795 popped all the bindings. Also remove undeduced 'auto' decls,
796 which LTO doesn't understand, and can't have been used by anything. */
801 for (d
= &BLOCK_VARS (block
); *d
; )
803 if (TREE_CODE (*d
) == TREE_LIST
804 || (!processing_template_decl
805 && undeduced_auto_decl (*d
)))
806 *d
= TREE_CHAIN (*d
);
808 d
= &DECL_CHAIN (*d
);
812 /* If the level being exited is the top level of a function,
813 check over all the labels. */
818 /* Since this is the top level block of a function, the vars are
819 the function's parameters. Don't leave them in the BLOCK
820 because they are found in the FUNCTION_DECL instead. */
821 BLOCK_VARS (block
) = 0;
825 pop_labels (subblocks
);
828 kind
= current_binding_level
->kind
;
829 if (kind
== sk_cleanup
)
833 /* If this is a temporary binding created for a cleanup, then we'll
834 have pushed a statement list level. Pop that, create a new
835 BIND_EXPR for the block, and insert it into the stream. */
836 stmt
= pop_stmt_list (current_binding_level
->statement_list
);
837 stmt
= c_build_bind_expr (input_location
, block
, stmt
);
844 /* The current function is being defined, so its DECL_INITIAL
845 should be error_mark_node. */
846 gcc_assert (DECL_INITIAL (current_function_decl
) == error_mark_node
);
847 DECL_INITIAL (current_function_decl
) = block
? block
: subblocks
;
850 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl
))
852 if (BLOCK_SUBBLOCKS (subblocks
))
853 BLOCK_OUTER_CURLY_BRACE_P (BLOCK_SUBBLOCKS (subblocks
)) = 1;
856 BLOCK_OUTER_CURLY_BRACE_P (subblocks
) = 1;
860 current_binding_level
->blocks
861 = block_chainon (current_binding_level
->blocks
, block
);
863 /* If we did not make a block for the level just exited,
864 any blocks made for inner levels
865 (since they cannot be recorded as subblocks in that level)
866 must be carried forward so they will later become subblocks
867 of something else. */
869 current_binding_level
->blocks
870 = block_chainon (current_binding_level
->blocks
, subblocks
);
872 /* Each and every BLOCK node created here in `poplevel' is important
873 (e.g. for proper debugging information) so if we created one
874 earlier, mark it as "used". */
876 TREE_USED (block
) = 1;
878 /* All temporary bindings created for cleanups are popped silently. */
879 if (kind
== sk_cleanup
)
882 timevar_cond_stop (TV_NAME_LOOKUP
, subtime
);
886 /* Call wrapup_globals_declarations for the globals in NAMESPACE. */
887 /* Diagnose odr-used extern inline variables without definitions
888 in the current TU. */
891 wrapup_namespace_globals ()
893 if (vec
<tree
, va_gc
> *statics
= static_decls
)
897 FOR_EACH_VEC_ELT (*statics
, i
, decl
)
899 if (warn_unused_function
900 && TREE_CODE (decl
) == FUNCTION_DECL
901 && DECL_INITIAL (decl
) == 0
902 && DECL_EXTERNAL (decl
)
903 && !TREE_PUBLIC (decl
)
904 && !DECL_ARTIFICIAL (decl
)
905 && !DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl
)
906 && !TREE_NO_WARNING (decl
))
907 warning_at (DECL_SOURCE_LOCATION (decl
),
908 OPT_Wunused_function
,
909 "%qF declared %<static%> but never defined", decl
);
912 && DECL_EXTERNAL (decl
)
913 && DECL_INLINE_VAR_P (decl
)
914 && DECL_ODR_USED (decl
))
915 error_at (DECL_SOURCE_LOCATION (decl
),
916 "odr-used inline variable %qD is not defined", decl
);
919 /* Clear out the list, so we don't rescan next time. */
922 /* Write out any globals that need to be output. */
923 return wrapup_global_declarations (statics
->address (),
929 /* In C++, you don't have to write `struct S' to refer to `S'; you
930 can just use `S'. We accomplish this by creating a TYPE_DECL as
931 if the user had written `typedef struct S S'. Create and return
932 the TYPE_DECL for TYPE. */
935 create_implicit_typedef (tree name
, tree type
)
939 decl
= build_decl (input_location
, TYPE_DECL
, name
, type
);
940 DECL_ARTIFICIAL (decl
) = 1;
941 /* There are other implicit type declarations, like the one *within*
942 a class that allows you to write `S::S'. We must distinguish
944 SET_DECL_IMPLICIT_TYPEDEF_P (decl
);
945 TYPE_NAME (type
) = decl
;
946 TYPE_STUB_DECL (type
) = decl
;
951 /* Remember a local name for name-mangling purposes. */
954 push_local_name (tree decl
)
959 timevar_start (TV_NAME_LOOKUP
);
961 name
= DECL_NAME (decl
);
963 nelts
= vec_safe_length (local_names
);
964 for (i
= 0; i
< nelts
; i
++)
966 t
= (*local_names
)[i
];
967 if (DECL_NAME (t
) == name
)
969 retrofit_lang_decl (decl
);
970 DECL_LANG_SPECIFIC (decl
)->u
.base
.u2sel
= 1;
971 if (DECL_DISCRIMINATOR_SET_P (t
))
972 DECL_DISCRIMINATOR (decl
) = DECL_DISCRIMINATOR (t
) + 1;
974 DECL_DISCRIMINATOR (decl
) = 1;
976 (*local_names
)[i
] = decl
;
977 timevar_stop (TV_NAME_LOOKUP
);
982 vec_safe_push (local_names
, decl
);
983 timevar_stop (TV_NAME_LOOKUP
);
986 /* Subroutine of duplicate_decls: return truthvalue of whether
987 or not types of these decls match.
989 For C++, we must compare the parameter list so that `int' can match
990 `int&' in a parameter position, but `int&' is not confused with
994 decls_match (tree newdecl
, tree olddecl
, bool record_versions
/* = true */)
998 if (newdecl
== olddecl
)
1001 if (TREE_CODE (newdecl
) != TREE_CODE (olddecl
))
1002 /* If the two DECLs are not even the same kind of thing, we're not
1003 interested in their types. */
1006 gcc_assert (DECL_P (newdecl
));
1008 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1010 tree f1
= TREE_TYPE (newdecl
);
1011 tree f2
= TREE_TYPE (olddecl
);
1012 tree p1
= TYPE_ARG_TYPES (f1
);
1013 tree p2
= TYPE_ARG_TYPES (f2
);
1016 /* Specializations of different templates are different functions
1017 even if they have the same type. */
1018 tree t1
= (DECL_USE_TEMPLATE (newdecl
)
1019 ? DECL_TI_TEMPLATE (newdecl
)
1021 tree t2
= (DECL_USE_TEMPLATE (olddecl
)
1022 ? DECL_TI_TEMPLATE (olddecl
)
1027 if (CP_DECL_CONTEXT (newdecl
) != CP_DECL_CONTEXT (olddecl
)
1028 && ! (DECL_EXTERN_C_P (newdecl
)
1029 && DECL_EXTERN_C_P (olddecl
)))
1032 /* A new declaration doesn't match a built-in one unless it
1033 is also extern "C". */
1034 if (DECL_IS_BUILTIN (olddecl
)
1035 && DECL_EXTERN_C_P (olddecl
) && !DECL_EXTERN_C_P (newdecl
))
1038 if (TREE_CODE (f1
) != TREE_CODE (f2
))
1041 /* A declaration with deduced return type should use its pre-deduction
1042 type for declaration matching. */
1043 r2
= fndecl_declared_return_type (olddecl
);
1045 if (same_type_p (TREE_TYPE (f1
), r2
))
1047 if (!prototype_p (f2
) && DECL_EXTERN_C_P (olddecl
)
1048 && (DECL_BUILT_IN (olddecl
)
1049 #ifndef NO_IMPLICIT_EXTERN_C
1050 || (DECL_IN_SYSTEM_HEADER (newdecl
) && !DECL_CLASS_SCOPE_P (newdecl
))
1051 || (DECL_IN_SYSTEM_HEADER (olddecl
) && !DECL_CLASS_SCOPE_P (olddecl
))
1055 types_match
= self_promoting_args_p (p1
);
1056 if (p1
== void_list_node
)
1057 TREE_TYPE (newdecl
) = TREE_TYPE (olddecl
);
1059 #ifndef NO_IMPLICIT_EXTERN_C
1060 else if (!prototype_p (f1
)
1061 && (DECL_EXTERN_C_P (olddecl
)
1062 && DECL_IN_SYSTEM_HEADER (olddecl
)
1063 && !DECL_CLASS_SCOPE_P (olddecl
))
1064 && (DECL_EXTERN_C_P (newdecl
)
1065 && DECL_IN_SYSTEM_HEADER (newdecl
)
1066 && !DECL_CLASS_SCOPE_P (newdecl
)))
1068 types_match
= self_promoting_args_p (p2
);
1069 TREE_TYPE (newdecl
) = TREE_TYPE (olddecl
);
1075 && type_memfn_rqual (f1
) == type_memfn_rqual (f2
)
1076 && (TYPE_ATTRIBUTES (TREE_TYPE (newdecl
)) == NULL_TREE
1077 || comp_type_attributes (TREE_TYPE (newdecl
),
1078 TREE_TYPE (olddecl
)) != 0);
1083 /* The decls dont match if they correspond to two different versions
1084 of the same function. Disallow extern "C" functions to be
1085 versions for now. */
1087 && !DECL_EXTERN_C_P (newdecl
)
1088 && !DECL_EXTERN_C_P (olddecl
)
1090 && maybe_version_functions (newdecl
, olddecl
,
1091 (!DECL_FUNCTION_VERSIONED (newdecl
)
1092 || !DECL_FUNCTION_VERSIONED (olddecl
))))
1095 else if (TREE_CODE (newdecl
) == TEMPLATE_DECL
)
1097 tree oldres
= DECL_TEMPLATE_RESULT (olddecl
);
1098 tree newres
= DECL_TEMPLATE_RESULT (newdecl
);
1100 if (TREE_CODE (newres
) != TREE_CODE (oldres
))
1103 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl
),
1104 DECL_TEMPLATE_PARMS (olddecl
)))
1107 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) == TYPE_DECL
)
1108 types_match
= (same_type_p (TREE_TYPE (oldres
), TREE_TYPE (newres
))
1109 && equivalently_constrained (olddecl
, newdecl
));
1111 // We don't need to check equivalently_constrained for variable and
1112 // function templates because we check it on the results.
1113 types_match
= decls_match (oldres
, newres
);
1117 /* Need to check scope for variable declaration (VAR_DECL).
1118 For typedef (TYPE_DECL), scope is ignored. */
1120 && CP_DECL_CONTEXT (newdecl
) != CP_DECL_CONTEXT (olddecl
)
1122 Two declarations for an object with C language linkage
1123 with the same name (ignoring the namespace that qualify
1124 it) that appear in different namespace scopes refer to
1126 && !(DECL_EXTERN_C_P (olddecl
) && DECL_EXTERN_C_P (newdecl
)))
1129 if (TREE_TYPE (newdecl
) == error_mark_node
)
1130 types_match
= TREE_TYPE (olddecl
) == error_mark_node
;
1131 else if (TREE_TYPE (olddecl
) == NULL_TREE
)
1132 types_match
= TREE_TYPE (newdecl
) == NULL_TREE
;
1133 else if (TREE_TYPE (newdecl
) == NULL_TREE
)
1136 types_match
= comptypes (TREE_TYPE (newdecl
),
1137 TREE_TYPE (olddecl
),
1138 COMPARE_REDECLARATION
);
1141 // Normal functions can be constrained, as can variable partial
1143 if (types_match
&& VAR_OR_FUNCTION_DECL_P (newdecl
))
1144 types_match
= equivalently_constrained (newdecl
, olddecl
);
1149 /* NEWDECL and OLDDECL have identical signatures. If they are
1150 different versions adjust them and return true.
1151 If RECORD is set to true, record function versions. */
1154 maybe_version_functions (tree newdecl
, tree olddecl
, bool record
)
1156 if (!targetm
.target_option
.function_versions (newdecl
, olddecl
))
1159 if (!DECL_FUNCTION_VERSIONED (olddecl
))
1161 DECL_FUNCTION_VERSIONED (olddecl
) = 1;
1162 if (DECL_ASSEMBLER_NAME_SET_P (olddecl
))
1163 mangle_decl (olddecl
);
1166 if (!DECL_FUNCTION_VERSIONED (newdecl
))
1168 DECL_FUNCTION_VERSIONED (newdecl
) = 1;
1169 if (DECL_ASSEMBLER_NAME_SET_P (newdecl
))
1170 mangle_decl (newdecl
);
1174 cgraph_node::record_function_versions (olddecl
, newdecl
);
1179 /* If NEWDECL is `static' and an `extern' was seen previously,
1180 warn about it. OLDDECL is the previous declaration.
1182 Note that this does not apply to the C++ case of declaring
1183 a variable `extern const' and then later `const'.
1185 Don't complain about built-in functions, since they are beyond
1186 the user's control. */
1189 warn_extern_redeclared_static (tree newdecl
, tree olddecl
)
1191 if (TREE_CODE (newdecl
) == TYPE_DECL
1192 || TREE_CODE (newdecl
) == TEMPLATE_DECL
1193 || TREE_CODE (newdecl
) == CONST_DECL
1194 || TREE_CODE (newdecl
) == NAMESPACE_DECL
)
1197 /* Don't get confused by static member functions; that's a different
1199 if (TREE_CODE (newdecl
) == FUNCTION_DECL
1200 && DECL_STATIC_FUNCTION_P (newdecl
))
1203 /* If the old declaration was `static', or the new one isn't, then
1204 everything is OK. */
1205 if (DECL_THIS_STATIC (olddecl
) || !DECL_THIS_STATIC (newdecl
))
1208 /* It's OK to declare a builtin function as `static'. */
1209 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1210 && DECL_ARTIFICIAL (olddecl
))
1213 if (permerror (DECL_SOURCE_LOCATION (newdecl
),
1214 "%qD was declared %<extern%> and later %<static%>", newdecl
))
1215 inform (DECL_SOURCE_LOCATION (olddecl
),
1216 "previous declaration of %qD", olddecl
);
1219 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1220 function templates. If their exception specifications do not
1221 match, issue a diagnostic. */
1224 check_redeclaration_exception_specification (tree new_decl
,
1227 tree new_exceptions
= TYPE_RAISES_EXCEPTIONS (TREE_TYPE (new_decl
));
1228 tree old_exceptions
= TYPE_RAISES_EXCEPTIONS (TREE_TYPE (old_decl
));
1230 /* Two default specs are equivalent, don't force evaluation. */
1231 if (UNEVALUATED_NOEXCEPT_SPEC_P (new_exceptions
)
1232 && UNEVALUATED_NOEXCEPT_SPEC_P (old_exceptions
))
1235 maybe_instantiate_noexcept (new_decl
);
1236 maybe_instantiate_noexcept (old_decl
);
1237 new_exceptions
= TYPE_RAISES_EXCEPTIONS (TREE_TYPE (new_decl
));
1238 old_exceptions
= TYPE_RAISES_EXCEPTIONS (TREE_TYPE (old_decl
));
1242 If any declaration of a function has an exception-specification,
1243 all declarations, including the definition and an explicit
1244 specialization, of that function shall have an
1245 exception-specification with the same set of type-ids. */
1246 if (! DECL_IS_BUILTIN (old_decl
)
1247 && !comp_except_specs (new_exceptions
, old_exceptions
, ce_normal
))
1249 const char *const msg
1250 = G_("declaration of %qF has a different exception specifier");
1251 bool complained
= true;
1252 location_t new_loc
= DECL_SOURCE_LOCATION (new_decl
);
1253 if (DECL_IN_SYSTEM_HEADER (old_decl
))
1254 complained
= pedwarn (new_loc
, OPT_Wsystem_headers
, msg
, new_decl
);
1255 else if (!flag_exceptions
)
1256 /* We used to silently permit mismatched eh specs with
1257 -fno-exceptions, so make them a pedwarn now. */
1258 complained
= pedwarn (new_loc
, OPT_Wpedantic
, msg
, new_decl
);
1260 error_at (new_loc
, msg
, new_decl
);
1262 inform (DECL_SOURCE_LOCATION (old_decl
),
1263 "from previous declaration %qF", old_decl
);
1267 /* Return true if OLD_DECL and NEW_DECL agree on constexprness.
1268 Otherwise issue diagnostics. */
1271 validate_constexpr_redeclaration (tree old_decl
, tree new_decl
)
1273 old_decl
= STRIP_TEMPLATE (old_decl
);
1274 new_decl
= STRIP_TEMPLATE (new_decl
);
1275 if (!VAR_OR_FUNCTION_DECL_P (old_decl
)
1276 || !VAR_OR_FUNCTION_DECL_P (new_decl
))
1278 if (DECL_DECLARED_CONSTEXPR_P (old_decl
)
1279 == DECL_DECLARED_CONSTEXPR_P (new_decl
))
1281 if (TREE_CODE (old_decl
) == FUNCTION_DECL
)
1283 if (DECL_BUILT_IN (old_decl
))
1285 /* Hide a built-in declaration. */
1286 DECL_DECLARED_CONSTEXPR_P (old_decl
)
1287 = DECL_DECLARED_CONSTEXPR_P (new_decl
);
1290 /* 7.1.5 [dcl.constexpr]
1291 Note: An explicit specialization can differ from the template
1292 declaration with respect to the constexpr specifier. */
1293 if (! DECL_TEMPLATE_SPECIALIZATION (old_decl
)
1294 && DECL_TEMPLATE_SPECIALIZATION (new_decl
))
1297 error_at (DECL_SOURCE_LOCATION (new_decl
),
1298 "redeclaration %qD differs in %<constexpr%> "
1299 "from previous declaration", new_decl
);
1300 inform (DECL_SOURCE_LOCATION (old_decl
),
1301 "previous declaration %qD", old_decl
);
1307 // If OLDDECL and NEWDECL are concept declarations with the same type
1308 // (i.e., and template parameters), but different requirements,
1309 // emit diagnostics and return true. Otherwise, return false.
1311 check_concept_refinement (tree olddecl
, tree newdecl
)
1313 if (!DECL_DECLARED_CONCEPT_P (olddecl
) || !DECL_DECLARED_CONCEPT_P (newdecl
))
1316 tree d1
= DECL_TEMPLATE_RESULT (olddecl
);
1317 tree d2
= DECL_TEMPLATE_RESULT (newdecl
);
1318 if (TREE_CODE (d1
) != TREE_CODE (d2
))
1321 tree t1
= TREE_TYPE (d1
);
1322 tree t2
= TREE_TYPE (d2
);
1323 if (TREE_CODE (d1
) == FUNCTION_DECL
)
1325 if (compparms (TYPE_ARG_TYPES (t1
), TYPE_ARG_TYPES (t2
))
1326 && comp_template_parms (DECL_TEMPLATE_PARMS (olddecl
),
1327 DECL_TEMPLATE_PARMS (newdecl
))
1328 && !equivalently_constrained (olddecl
, newdecl
))
1330 error ("cannot specialize concept %q#D", olddecl
);
1337 /* DECL is a redeclaration of a function or function template. If
1338 it does have default arguments issue a diagnostic. Note: this
1339 function is used to enforce the requirements in C++11 8.3.6 about
1340 no default arguments in redeclarations. */
1343 check_redeclaration_no_default_args (tree decl
)
1345 gcc_assert (DECL_DECLARES_FUNCTION_P (decl
));
1347 for (tree t
= FUNCTION_FIRST_USER_PARMTYPE (decl
);
1348 t
&& t
!= void_list_node
; t
= TREE_CHAIN (t
))
1349 if (TREE_PURPOSE (t
))
1351 permerror (DECL_SOURCE_LOCATION (decl
),
1352 "redeclaration of %q#D may not have default "
1358 /* Merge tree bits that correspond to attributes noreturn, nothrow,
1359 const, malloc, and pure from NEWDECL with those of OLDDECL. */
1362 merge_attribute_bits (tree newdecl
, tree olddecl
)
1364 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
1365 TREE_THIS_VOLATILE (olddecl
) |= TREE_THIS_VOLATILE (newdecl
);
1366 TREE_NOTHROW (newdecl
) |= TREE_NOTHROW (olddecl
);
1367 TREE_NOTHROW (olddecl
) |= TREE_NOTHROW (newdecl
);
1368 TREE_READONLY (newdecl
) |= TREE_READONLY (olddecl
);
1369 TREE_READONLY (olddecl
) |= TREE_READONLY (newdecl
);
1370 DECL_IS_MALLOC (newdecl
) |= DECL_IS_MALLOC (olddecl
);
1371 DECL_IS_MALLOC (olddecl
) |= DECL_IS_MALLOC (newdecl
);
1372 DECL_PURE_P (newdecl
) |= DECL_PURE_P (olddecl
);
1373 DECL_PURE_P (olddecl
) |= DECL_PURE_P (newdecl
);
1374 DECL_UNINLINABLE (newdecl
) |= DECL_UNINLINABLE (olddecl
);
1375 DECL_UNINLINABLE (olddecl
) |= DECL_UNINLINABLE (newdecl
);
1378 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1379 && lookup_attribute ("gnu_inline", \
1380 DECL_ATTRIBUTES (fn)))
1382 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1383 If the redeclaration is invalid, a diagnostic is issued, and the
1384 error_mark_node is returned. Otherwise, OLDDECL is returned.
1386 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1389 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1392 duplicate_decls (tree newdecl
, tree olddecl
, bool newdecl_is_friend
)
1394 unsigned olddecl_uid
= DECL_UID (olddecl
);
1395 int olddecl_friend
= 0, types_match
= 0, hidden_friend
= 0;
1396 int new_defines_function
= 0;
1397 tree new_template_info
;
1399 if (newdecl
== olddecl
)
1402 types_match
= decls_match (newdecl
, olddecl
);
1404 /* If either the type of the new decl or the type of the old decl is an
1405 error_mark_node, then that implies that we have already issued an
1406 error (earlier) for some bogus type specification, and in that case,
1407 it is rather pointless to harass the user with yet more error message
1408 about the same declaration, so just pretend the types match here. */
1409 if (TREE_TYPE (newdecl
) == error_mark_node
1410 || TREE_TYPE (olddecl
) == error_mark_node
)
1411 return error_mark_node
;
1413 if (DECL_NAME (newdecl
)
1414 && DECL_NAME (olddecl
)
1415 && UDLIT_OPER_P (DECL_NAME (newdecl
))
1416 && UDLIT_OPER_P (DECL_NAME (olddecl
)))
1418 if (TREE_CODE (newdecl
) == TEMPLATE_DECL
1419 && TREE_CODE (olddecl
) != TEMPLATE_DECL
1420 && check_raw_literal_operator (olddecl
))
1421 error ("literal operator template %q+D conflicts with"
1422 " raw literal operator %qD", newdecl
, olddecl
);
1423 else if (TREE_CODE (newdecl
) != TEMPLATE_DECL
1424 && TREE_CODE (olddecl
) == TEMPLATE_DECL
1425 && check_raw_literal_operator (newdecl
))
1426 error ("raw literal operator %q+D conflicts with"
1427 " literal operator template %qD", newdecl
, olddecl
);
1430 /* True to merge attributes between the declarations, false to
1431 set OLDDECL's attributes to those of NEWDECL (for template
1432 explicit specializations that specify their own attributes
1433 independent of those specified for the primary template). */
1434 const bool merge_attr
= (TREE_CODE (newdecl
) != FUNCTION_DECL
1435 || !DECL_TEMPLATE_SPECIALIZATION (newdecl
)
1436 || DECL_TEMPLATE_SPECIALIZATION (olddecl
));
1438 if (DECL_P (olddecl
)
1439 && TREE_CODE (newdecl
) == FUNCTION_DECL
1440 && TREE_CODE (olddecl
) == FUNCTION_DECL
1442 && diagnose_mismatched_attributes (olddecl
, newdecl
))
1444 if (DECL_INITIAL (olddecl
))
1445 inform (DECL_SOURCE_LOCATION (olddecl
),
1446 "previous definition of %qD was here", olddecl
);
1448 inform (DECL_SOURCE_LOCATION (olddecl
),
1449 "previous declaration of %qD was here", olddecl
);
1452 /* Check for redeclaration and other discrepancies. */
1453 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1454 && DECL_ARTIFICIAL (olddecl
))
1456 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl
));
1457 if (TREE_CODE (newdecl
) != FUNCTION_DECL
)
1459 /* Avoid warnings redeclaring built-ins which have not been
1460 explicitly declared. */
1461 if (DECL_ANTICIPATED (olddecl
))
1463 if (TREE_PUBLIC (newdecl
)
1464 && CP_DECL_CONTEXT (newdecl
) == global_namespace
)
1465 warning_at (DECL_SOURCE_LOCATION (newdecl
),
1466 OPT_Wbuiltin_declaration_mismatch
,
1467 "built-in function %qD declared as non-function",
1472 /* If you declare a built-in or predefined function name as static,
1473 the old definition is overridden, but optionally warn this was a
1474 bad choice of name. */
1475 if (! TREE_PUBLIC (newdecl
))
1477 warning (OPT_Wshadow
,
1478 DECL_BUILT_IN (olddecl
)
1479 ? G_("shadowing built-in function %q#D")
1480 : G_("shadowing library function %q#D"), olddecl
);
1481 /* Discard the old built-in function. */
1484 /* If the built-in is not ansi, then programs can override
1485 it even globally without an error. */
1486 else if (! DECL_BUILT_IN (olddecl
))
1487 warning_at (DECL_SOURCE_LOCATION (newdecl
), 0,
1488 "library function %q#D redeclared as non-function %q#D",
1491 error ("declaration of %q+#D conflicts with built-in "
1492 "declaration %q#D", newdecl
, olddecl
);
1495 else if (DECL_OMP_DECLARE_REDUCTION_P (olddecl
))
1497 gcc_assert (DECL_OMP_DECLARE_REDUCTION_P (newdecl
));
1498 error_at (DECL_SOURCE_LOCATION (newdecl
),
1499 "redeclaration of %<pragma omp declare reduction%>");
1500 inform (DECL_SOURCE_LOCATION (olddecl
),
1501 "previous %<pragma omp declare reduction%> declaration");
1502 return error_mark_node
;
1504 else if (!types_match
)
1506 /* Avoid warnings redeclaring built-ins which have not been
1507 explicitly declared. */
1508 if (DECL_ANTICIPATED (olddecl
))
1512 /* A new declaration doesn't match a built-in one unless it
1513 is also extern "C". */
1514 gcc_assert (DECL_IS_BUILTIN (olddecl
));
1515 gcc_assert (DECL_EXTERN_C_P (olddecl
));
1516 if (!DECL_EXTERN_C_P (newdecl
))
1519 for (t1
= TYPE_ARG_TYPES (TREE_TYPE (newdecl
)),
1520 t2
= TYPE_ARG_TYPES (TREE_TYPE (olddecl
));
1522 t1
= TREE_CHAIN (t1
), t2
= TREE_CHAIN (t2
))
1526 /* FILE, tm types are not known at the time
1527 we create the builtins. */
1528 for (unsigned i
= 0;
1529 i
< sizeof (builtin_structptr_types
)
1530 / sizeof (builtin_structptr_type
);
1532 if (TREE_VALUE (t2
) == builtin_structptr_types
[i
].node
)
1534 tree t
= TREE_VALUE (t1
);
1537 && TYPE_IDENTIFIER (TREE_TYPE (t
))
1538 == get_identifier (builtin_structptr_types
[i
].str
)
1539 && compparms (TREE_CHAIN (t1
), TREE_CHAIN (t2
)))
1541 tree oldargs
= TYPE_ARG_TYPES (TREE_TYPE (olddecl
));
1543 TYPE_ARG_TYPES (TREE_TYPE (olddecl
))
1544 = TYPE_ARG_TYPES (TREE_TYPE (newdecl
));
1545 types_match
= decls_match (newdecl
, olddecl
);
1547 return duplicate_decls (newdecl
, olddecl
,
1549 TYPE_ARG_TYPES (TREE_TYPE (olddecl
)) = oldargs
;
1554 if (! same_type_p (TREE_VALUE (t1
), TREE_VALUE (t2
)))
1559 warning_at (DECL_SOURCE_LOCATION (newdecl
),
1560 OPT_Wbuiltin_declaration_mismatch
,
1561 "declaration of %q#D conflicts with built-in "
1562 "declaration %q#D", newdecl
, olddecl
);
1564 else if ((DECL_EXTERN_C_P (newdecl
)
1565 && DECL_EXTERN_C_P (olddecl
))
1566 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl
)),
1567 TYPE_ARG_TYPES (TREE_TYPE (olddecl
))))
1569 /* Don't really override olddecl for __* prefixed builtins
1570 except for __[^b]*_chk, the compiler might be using those
1572 if (DECL_BUILT_IN (olddecl
))
1574 tree id
= DECL_NAME (olddecl
);
1575 const char *name
= IDENTIFIER_POINTER (id
);
1580 && (strncmp (name
+ 2, "builtin_",
1581 strlen ("builtin_")) == 0
1582 || (len
= strlen (name
)) <= strlen ("___chk")
1583 || memcmp (name
+ len
- strlen ("_chk"),
1584 "_chk", strlen ("_chk") + 1) != 0))
1586 if (DECL_INITIAL (newdecl
))
1588 error_at (DECL_SOURCE_LOCATION (newdecl
),
1589 "definition of %q#D ambiguates built-in "
1590 "declaration %q#D", newdecl
, olddecl
);
1591 return error_mark_node
;
1593 if (permerror (DECL_SOURCE_LOCATION (newdecl
),
1594 "new declaration %q#D ambiguates built-in"
1595 " declaration %q#D", newdecl
, olddecl
)
1597 inform (DECL_SOURCE_LOCATION (newdecl
),
1598 "ignoring the %q#D declaration", newdecl
);
1599 return flag_permissive
? olddecl
: error_mark_node
;
1603 /* A near match; override the builtin. */
1605 if (TREE_PUBLIC (newdecl
))
1606 warning_at (DECL_SOURCE_LOCATION (newdecl
),
1607 OPT_Wbuiltin_declaration_mismatch
,
1608 "new declaration %q#D ambiguates built-in "
1609 "declaration %q#D", newdecl
, olddecl
);
1611 warning (OPT_Wshadow
,
1612 DECL_BUILT_IN (olddecl
)
1613 ? G_("shadowing built-in function %q#D")
1614 : G_("shadowing library function %q#D"), olddecl
);
1617 /* Discard the old built-in function. */
1620 /* Replace the old RTL to avoid problems with inlining. */
1621 COPY_DECL_RTL (newdecl
, olddecl
);
1623 /* Even if the types match, prefer the new declarations type for
1624 built-ins which have not been explicitly declared, for
1625 exception lists, etc... */
1626 else if (DECL_IS_BUILTIN (olddecl
))
1628 tree type
= TREE_TYPE (newdecl
);
1629 tree attribs
= (*targetm
.merge_type_attributes
)
1630 (TREE_TYPE (olddecl
), type
);
1632 type
= cp_build_type_attribute_variant (type
, attribs
);
1633 TREE_TYPE (newdecl
) = TREE_TYPE (olddecl
) = type
;
1636 /* If a function is explicitly declared "throw ()", propagate that to
1637 the corresponding builtin. */
1638 if (DECL_BUILT_IN_CLASS (olddecl
) == BUILT_IN_NORMAL
1639 && DECL_ANTICIPATED (olddecl
)
1640 && TREE_NOTHROW (newdecl
)
1641 && !TREE_NOTHROW (olddecl
))
1643 enum built_in_function fncode
= DECL_FUNCTION_CODE (olddecl
);
1644 tree tmpdecl
= builtin_decl_explicit (fncode
);
1645 if (tmpdecl
&& tmpdecl
!= olddecl
&& types_match
)
1646 TREE_NOTHROW (tmpdecl
) = 1;
1649 /* Whether or not the builtin can throw exceptions has no
1650 bearing on this declarator. */
1651 TREE_NOTHROW (olddecl
) = 0;
1653 if (DECL_THIS_STATIC (newdecl
) && !DECL_THIS_STATIC (olddecl
))
1655 /* If a builtin function is redeclared as `static', merge
1656 the declarations, but make the original one static. */
1657 DECL_THIS_STATIC (olddecl
) = 1;
1658 TREE_PUBLIC (olddecl
) = 0;
1660 /* Make the old declaration consistent with the new one so
1661 that all remnants of the builtin-ness of this function
1662 will be banished. */
1663 SET_DECL_LANGUAGE (olddecl
, DECL_LANGUAGE (newdecl
));
1664 COPY_DECL_RTL (newdecl
, olddecl
);
1667 else if (TREE_CODE (olddecl
) != TREE_CODE (newdecl
))
1669 /* C++ Standard, 3.3, clause 4:
1670 "[Note: a namespace name or a class template name must be unique
1671 in its declarative region (7.3.2, clause 14). ]" */
1672 if (TREE_CODE (olddecl
) != NAMESPACE_DECL
1673 && TREE_CODE (newdecl
) != NAMESPACE_DECL
1674 && (TREE_CODE (olddecl
) != TEMPLATE_DECL
1675 || TREE_CODE (DECL_TEMPLATE_RESULT (olddecl
)) != TYPE_DECL
)
1676 && (TREE_CODE (newdecl
) != TEMPLATE_DECL
1677 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) != TYPE_DECL
))
1679 if ((TREE_CODE (olddecl
) == TYPE_DECL
&& DECL_ARTIFICIAL (olddecl
)
1680 && TREE_CODE (newdecl
) != TYPE_DECL
)
1681 || (TREE_CODE (newdecl
) == TYPE_DECL
&& DECL_ARTIFICIAL (newdecl
)
1682 && TREE_CODE (olddecl
) != TYPE_DECL
))
1684 /* We do nothing special here, because C++ does such nasty
1685 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1686 get shadowed, and know that if we need to find a TYPE_DECL
1687 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1688 slot of the identifier. */
1692 if ((TREE_CODE (newdecl
) == FUNCTION_DECL
1693 && DECL_FUNCTION_TEMPLATE_P (olddecl
))
1694 || (TREE_CODE (olddecl
) == FUNCTION_DECL
1695 && DECL_FUNCTION_TEMPLATE_P (newdecl
)))
1699 error ("%q#D redeclared as different kind of symbol", newdecl
);
1700 if (TREE_CODE (olddecl
) == TREE_LIST
)
1701 olddecl
= TREE_VALUE (olddecl
);
1702 inform (DECL_SOURCE_LOCATION (olddecl
),
1703 "previous declaration %q#D", olddecl
);
1705 return error_mark_node
;
1707 else if (!types_match
)
1709 if (CP_DECL_CONTEXT (newdecl
) != CP_DECL_CONTEXT (olddecl
))
1710 /* These are certainly not duplicate declarations; they're
1711 from different scopes. */
1714 if (TREE_CODE (newdecl
) == TEMPLATE_DECL
)
1716 /* The name of a class template may not be declared to refer to
1717 any other template, class, function, object, namespace, value,
1718 or type in the same scope. */
1719 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl
)) == TYPE_DECL
1720 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) == TYPE_DECL
)
1722 error ("conflicting declaration of template %q+#D", newdecl
);
1723 inform (DECL_SOURCE_LOCATION (olddecl
),
1724 "previous declaration %q#D", olddecl
);
1725 return error_mark_node
;
1727 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl
)) == FUNCTION_DECL
1728 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) == FUNCTION_DECL
1729 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl
))),
1730 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl
))))
1731 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl
),
1732 DECL_TEMPLATE_PARMS (olddecl
))
1733 /* Template functions can be disambiguated by
1735 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl
)),
1736 TREE_TYPE (TREE_TYPE (olddecl
)))
1737 // Template functions can also be disambiguated by
1739 && equivalently_constrained (olddecl
, newdecl
))
1741 error ("ambiguating new declaration %q+#D", newdecl
);
1742 inform (DECL_SOURCE_LOCATION (olddecl
),
1743 "old declaration %q#D", olddecl
);
1745 else if (check_concept_refinement (olddecl
, newdecl
))
1746 return error_mark_node
;
1749 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1751 if (DECL_EXTERN_C_P (newdecl
) && DECL_EXTERN_C_P (olddecl
))
1753 error ("conflicting declaration of C function %q+#D",
1755 inform (DECL_SOURCE_LOCATION (olddecl
),
1756 "previous declaration %q#D", olddecl
);
1759 /* For function versions, params and types match, but they
1760 are not ambiguous. */
1761 else if ((!DECL_FUNCTION_VERSIONED (newdecl
)
1762 && !DECL_FUNCTION_VERSIONED (olddecl
))
1763 // The functions have the same parameter types.
1764 && compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl
)),
1765 TYPE_ARG_TYPES (TREE_TYPE (olddecl
)))
1766 // And the same constraints.
1767 && equivalently_constrained (newdecl
, olddecl
))
1769 error ("ambiguating new declaration of %q+#D", newdecl
);
1770 inform (DECL_SOURCE_LOCATION (olddecl
),
1771 "old declaration %q#D", olddecl
);
1772 return error_mark_node
;
1779 error ("conflicting declaration %q+#D", newdecl
);
1780 inform (DECL_SOURCE_LOCATION (olddecl
),
1781 "previous declaration as %q#D", olddecl
);
1782 return error_mark_node
;
1785 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
1786 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl
)
1787 && (!DECL_TEMPLATE_INFO (newdecl
)
1788 || (DECL_TI_TEMPLATE (newdecl
)
1789 != DECL_TI_TEMPLATE (olddecl
))))
1790 || (DECL_TEMPLATE_SPECIALIZATION (newdecl
)
1791 && (!DECL_TEMPLATE_INFO (olddecl
)
1792 || (DECL_TI_TEMPLATE (olddecl
)
1793 != DECL_TI_TEMPLATE (newdecl
))))))
1794 /* It's OK to have a template specialization and a non-template
1795 with the same type, or to have specializations of two
1796 different templates with the same type. Note that if one is a
1797 specialization, and the other is an instantiation of the same
1798 template, that we do not exit at this point. That situation
1799 can occur if we instantiate a template class, and then
1800 specialize one of its methods. This situation is valid, but
1801 the declarations must be merged in the usual way. */
1803 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
1804 && ((DECL_TEMPLATE_INSTANTIATION (olddecl
)
1805 && !DECL_USE_TEMPLATE (newdecl
))
1806 || (DECL_TEMPLATE_INSTANTIATION (newdecl
)
1807 && !DECL_USE_TEMPLATE (olddecl
))))
1808 /* One of the declarations is a template instantiation, and the
1809 other is not a template at all. That's OK. */
1811 else if (TREE_CODE (newdecl
) == NAMESPACE_DECL
)
1813 /* In [namespace.alias] we have:
1815 In a declarative region, a namespace-alias-definition can be
1816 used to redefine a namespace-alias declared in that declarative
1817 region to refer only to the namespace to which it already
1820 Therefore, if we encounter a second alias directive for the same
1821 alias, we can just ignore the second directive. */
1822 if (DECL_NAMESPACE_ALIAS (newdecl
)
1823 && (DECL_NAMESPACE_ALIAS (newdecl
)
1824 == DECL_NAMESPACE_ALIAS (olddecl
)))
1827 /* Leave it to update_binding to merge or report error. */
1832 const char *errmsg
= redeclaration_error_message (newdecl
, olddecl
);
1835 error_at (DECL_SOURCE_LOCATION (newdecl
), errmsg
, newdecl
);
1836 if (DECL_NAME (olddecl
) != NULL_TREE
)
1837 inform (DECL_SOURCE_LOCATION (olddecl
),
1838 (DECL_INITIAL (olddecl
) && namespace_bindings_p ())
1839 ? G_("%q#D previously defined here")
1840 : G_("%q#D previously declared here"), olddecl
);
1841 return error_mark_node
;
1843 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1844 && DECL_INITIAL (olddecl
) != NULL_TREE
1845 && !prototype_p (TREE_TYPE (olddecl
))
1846 && prototype_p (TREE_TYPE (newdecl
)))
1848 /* Prototype decl follows defn w/o prototype. */
1849 if (warning_at (DECL_SOURCE_LOCATION (newdecl
), 0,
1850 "prototype specified for %q#D", newdecl
))
1851 inform (DECL_SOURCE_LOCATION (olddecl
),
1852 "previous non-prototype definition here");
1854 else if (VAR_OR_FUNCTION_DECL_P (olddecl
)
1855 && DECL_LANGUAGE (newdecl
) != DECL_LANGUAGE (olddecl
))
1858 If two declarations of the same function or object
1859 specify different linkage-specifications ..., the program
1860 is ill-formed.... Except for functions with C++ linkage,
1861 a function declaration without a linkage specification
1862 shall not precede the first linkage specification for
1863 that function. A function can be declared without a
1864 linkage specification after an explicit linkage
1865 specification has been seen; the linkage explicitly
1866 specified in the earlier declaration is not affected by
1867 such a function declaration.
1869 DR 563 raises the question why the restrictions on
1870 functions should not also apply to objects. Older
1871 versions of G++ silently ignore the linkage-specification
1879 which is clearly wrong. Therefore, we now treat objects
1881 if (current_lang_depth () == 0)
1883 /* There is no explicit linkage-specification, so we use
1884 the linkage from the previous declaration. */
1885 retrofit_lang_decl (newdecl
);
1886 SET_DECL_LANGUAGE (newdecl
, DECL_LANGUAGE (olddecl
));
1890 error ("conflicting declaration of %q+#D with %qL linkage",
1891 newdecl
, DECL_LANGUAGE (newdecl
));
1892 inform (DECL_SOURCE_LOCATION (olddecl
),
1893 "previous declaration with %qL linkage",
1894 DECL_LANGUAGE (olddecl
));
1898 if (DECL_LANG_SPECIFIC (olddecl
) && DECL_USE_TEMPLATE (olddecl
))
1900 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
1902 /* Note: free functions, as TEMPLATE_DECLs, are handled below. */
1903 if (DECL_FUNCTION_MEMBER_P (olddecl
)
1904 && (/* grokfndecl passes member function templates too
1905 as FUNCTION_DECLs. */
1906 DECL_TEMPLATE_INFO (olddecl
)
1908 Default arguments for a member function of a class
1909 template shall be specified on the initial declaration
1910 of the member function within the class template. */
1911 || CLASSTYPE_TEMPLATE_INFO (CP_DECL_CONTEXT (olddecl
))))
1912 check_redeclaration_no_default_args (newdecl
);
1915 tree t1
= FUNCTION_FIRST_USER_PARMTYPE (olddecl
);
1916 tree t2
= FUNCTION_FIRST_USER_PARMTYPE (newdecl
);
1919 for (; t1
&& t1
!= void_list_node
;
1920 t1
= TREE_CHAIN (t1
), t2
= TREE_CHAIN (t2
), i
++)
1921 if (TREE_PURPOSE (t1
) && TREE_PURPOSE (t2
))
1923 if (simple_cst_equal (TREE_PURPOSE (t1
),
1924 TREE_PURPOSE (t2
)) == 1)
1926 if (permerror (input_location
,
1927 "default argument given for parameter "
1928 "%d of %q#D", i
, newdecl
))
1929 inform (DECL_SOURCE_LOCATION (olddecl
),
1930 "previous specification in %q#D here",
1935 error ("default argument given for parameter %d "
1936 "of %q#D", i
, newdecl
);
1937 inform (DECL_SOURCE_LOCATION (olddecl
),
1938 "previous specification in %q#D here",
1946 /* Do not merge an implicit typedef with an explicit one. In:
1950 typedef class A A __attribute__ ((foo));
1952 the attribute should apply only to the typedef. */
1953 if (TREE_CODE (olddecl
) == TYPE_DECL
1954 && (DECL_IMPLICIT_TYPEDEF_P (olddecl
)
1955 || DECL_IMPLICIT_TYPEDEF_P (newdecl
)))
1958 /* If new decl is `static' and an `extern' was seen previously,
1960 warn_extern_redeclared_static (newdecl
, olddecl
);
1962 if (!validate_constexpr_redeclaration (olddecl
, newdecl
))
1963 return error_mark_node
;
1965 /* We have committed to returning 1 at this point. */
1966 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1968 /* Now that functions must hold information normally held
1969 by field decls, there is extra work to do so that
1970 declaration information does not get destroyed during
1972 if (DECL_VINDEX (olddecl
))
1973 DECL_VINDEX (newdecl
) = DECL_VINDEX (olddecl
);
1974 if (DECL_CONTEXT (olddecl
))
1975 DECL_CONTEXT (newdecl
) = DECL_CONTEXT (olddecl
);
1976 DECL_STATIC_CONSTRUCTOR (newdecl
) |= DECL_STATIC_CONSTRUCTOR (olddecl
);
1977 DECL_STATIC_DESTRUCTOR (newdecl
) |= DECL_STATIC_DESTRUCTOR (olddecl
);
1978 DECL_PURE_VIRTUAL_P (newdecl
) |= DECL_PURE_VIRTUAL_P (olddecl
);
1979 DECL_VIRTUAL_P (newdecl
) |= DECL_VIRTUAL_P (olddecl
);
1980 DECL_INVALID_OVERRIDER_P (newdecl
) |= DECL_INVALID_OVERRIDER_P (olddecl
);
1981 DECL_FINAL_P (newdecl
) |= DECL_FINAL_P (olddecl
);
1982 DECL_OVERRIDE_P (newdecl
) |= DECL_OVERRIDE_P (olddecl
);
1983 DECL_THIS_STATIC (newdecl
) |= DECL_THIS_STATIC (olddecl
);
1984 if (DECL_OVERLOADED_OPERATOR_P (olddecl
))
1985 DECL_OVERLOADED_OPERATOR_CODE_RAW (newdecl
)
1986 = DECL_OVERLOADED_OPERATOR_CODE_RAW (olddecl
);
1987 new_defines_function
= DECL_INITIAL (newdecl
) != NULL_TREE
;
1989 /* Optionally warn about more than one declaration for the same
1990 name, but don't warn about a function declaration followed by a
1992 if (warn_redundant_decls
&& ! DECL_ARTIFICIAL (olddecl
)
1993 && !(new_defines_function
&& DECL_INITIAL (olddecl
) == NULL_TREE
)
1994 /* Don't warn about extern decl followed by definition. */
1995 && !(DECL_EXTERNAL (olddecl
) && ! DECL_EXTERNAL (newdecl
))
1996 /* Don't warn about friends, let add_friend take care of it. */
1997 && ! (newdecl_is_friend
|| DECL_FRIEND_P (olddecl
))
1998 /* Don't warn about declaration followed by specialization. */
1999 && (! DECL_TEMPLATE_SPECIALIZATION (newdecl
)
2000 || DECL_TEMPLATE_SPECIALIZATION (olddecl
)))
2002 if (warning_at (DECL_SOURCE_LOCATION (newdecl
),
2003 OPT_Wredundant_decls
,
2004 "redundant redeclaration of %qD in same scope",
2006 inform (DECL_SOURCE_LOCATION (olddecl
),
2007 "previous declaration of %qD", olddecl
);
2010 if (!(DECL_TEMPLATE_INSTANTIATION (olddecl
)
2011 && DECL_TEMPLATE_SPECIALIZATION (newdecl
)))
2013 if (DECL_DELETED_FN (newdecl
))
2015 error ("deleted definition of %q+D", newdecl
);
2016 inform (DECL_SOURCE_LOCATION (olddecl
),
2017 "previous declaration of %qD", olddecl
);
2019 DECL_DELETED_FN (newdecl
) |= DECL_DELETED_FN (olddecl
);
2023 /* Deal with C++: must preserve virtual function table size. */
2024 if (TREE_CODE (olddecl
) == TYPE_DECL
)
2026 tree newtype
= TREE_TYPE (newdecl
);
2027 tree oldtype
= TREE_TYPE (olddecl
);
2029 if (newtype
!= error_mark_node
&& oldtype
!= error_mark_node
2030 && TYPE_LANG_SPECIFIC (newtype
) && TYPE_LANG_SPECIFIC (oldtype
))
2031 CLASSTYPE_FRIEND_CLASSES (newtype
)
2032 = CLASSTYPE_FRIEND_CLASSES (oldtype
);
2034 DECL_ORIGINAL_TYPE (newdecl
) = DECL_ORIGINAL_TYPE (olddecl
);
2037 /* Copy all the DECL_... slots specified in the new decl except for
2038 any that we copy here from the old type. */
2040 DECL_ATTRIBUTES (newdecl
)
2041 = (*targetm
.merge_decl_attributes
) (olddecl
, newdecl
);
2043 DECL_ATTRIBUTES (olddecl
) = DECL_ATTRIBUTES (newdecl
);
2045 if (DECL_DECLARES_FUNCTION_P (olddecl
) && DECL_DECLARES_FUNCTION_P (newdecl
))
2047 olddecl_friend
= DECL_FRIEND_P (olddecl
);
2048 hidden_friend
= (DECL_ANTICIPATED (olddecl
)
2049 && DECL_HIDDEN_FRIEND_P (olddecl
)
2050 && newdecl_is_friend
);
2053 DECL_ANTICIPATED (olddecl
) = 0;
2054 DECL_HIDDEN_FRIEND_P (olddecl
) = 0;
2058 if (TREE_CODE (newdecl
) == TEMPLATE_DECL
)
2062 old_result
= DECL_TEMPLATE_RESULT (olddecl
);
2063 new_result
= DECL_TEMPLATE_RESULT (newdecl
);
2064 TREE_TYPE (olddecl
) = TREE_TYPE (old_result
);
2065 DECL_TEMPLATE_SPECIALIZATIONS (olddecl
)
2066 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl
),
2067 DECL_TEMPLATE_SPECIALIZATIONS (newdecl
));
2069 DECL_ATTRIBUTES (old_result
)
2070 = (*targetm
.merge_decl_attributes
) (old_result
, new_result
);
2072 if (DECL_FUNCTION_TEMPLATE_P (newdecl
))
2074 /* Per C++11 8.3.6/4, default arguments cannot be added in later
2075 declarations of a function template. */
2076 if (DECL_SOURCE_LOCATION (newdecl
)
2077 != DECL_SOURCE_LOCATION (olddecl
))
2078 check_redeclaration_no_default_args (newdecl
);
2080 check_default_args (newdecl
);
2082 if (GNU_INLINE_P (old_result
) != GNU_INLINE_P (new_result
)
2083 && DECL_INITIAL (new_result
))
2085 if (DECL_INITIAL (old_result
))
2086 DECL_UNINLINABLE (old_result
) = 1;
2088 DECL_UNINLINABLE (old_result
) = DECL_UNINLINABLE (new_result
);
2089 DECL_EXTERNAL (old_result
) = DECL_EXTERNAL (new_result
);
2090 DECL_NOT_REALLY_EXTERN (old_result
)
2091 = DECL_NOT_REALLY_EXTERN (new_result
);
2092 DECL_INTERFACE_KNOWN (old_result
)
2093 = DECL_INTERFACE_KNOWN (new_result
);
2094 DECL_DECLARED_INLINE_P (old_result
)
2095 = DECL_DECLARED_INLINE_P (new_result
);
2096 DECL_DISREGARD_INLINE_LIMITS (old_result
)
2097 |= DECL_DISREGARD_INLINE_LIMITS (new_result
);
2102 DECL_DECLARED_INLINE_P (old_result
)
2103 |= DECL_DECLARED_INLINE_P (new_result
);
2104 DECL_DISREGARD_INLINE_LIMITS (old_result
)
2105 |= DECL_DISREGARD_INLINE_LIMITS (new_result
);
2106 check_redeclaration_exception_specification (newdecl
, olddecl
);
2108 merge_attribute_bits (new_result
, old_result
);
2112 /* If the new declaration is a definition, update the file and
2113 line information on the declaration, and also make
2114 the old declaration the same definition. */
2115 if (DECL_INITIAL (new_result
) != NULL_TREE
)
2117 DECL_SOURCE_LOCATION (olddecl
)
2118 = DECL_SOURCE_LOCATION (old_result
)
2119 = DECL_SOURCE_LOCATION (newdecl
);
2120 DECL_INITIAL (old_result
) = DECL_INITIAL (new_result
);
2121 if (DECL_FUNCTION_TEMPLATE_P (newdecl
))
2124 DECL_ARGUMENTS (old_result
)
2125 = DECL_ARGUMENTS (new_result
);
2126 for (parm
= DECL_ARGUMENTS (old_result
); parm
;
2127 parm
= DECL_CHAIN (parm
))
2128 DECL_CONTEXT (parm
) = old_result
;
2137 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2138 check_redeclaration_exception_specification (newdecl
, olddecl
);
2140 /* Automatically handles default parameters. */
2141 tree oldtype
= TREE_TYPE (olddecl
);
2144 /* For typedefs use the old type, as the new type's DECL_NAME points
2145 at newdecl, which will be ggc_freed. */
2146 if (TREE_CODE (newdecl
) == TYPE_DECL
)
2148 /* But NEWTYPE might have an attribute, honor that. */
2149 tree tem
= TREE_TYPE (newdecl
);
2152 if (TYPE_USER_ALIGN (tem
))
2154 if (TYPE_ALIGN (tem
) > TYPE_ALIGN (newtype
))
2155 SET_TYPE_ALIGN (newtype
, TYPE_ALIGN (tem
));
2156 TYPE_USER_ALIGN (newtype
) = true;
2159 /* And remove the new type from the variants list. */
2160 if (TYPE_NAME (TREE_TYPE (newdecl
)) == newdecl
)
2162 tree remove
= TREE_TYPE (newdecl
);
2163 for (tree t
= TYPE_MAIN_VARIANT (remove
); ;
2164 t
= TYPE_NEXT_VARIANT (t
))
2165 if (TYPE_NEXT_VARIANT (t
) == remove
)
2167 TYPE_NEXT_VARIANT (t
) = TYPE_NEXT_VARIANT (remove
);
2172 else if (merge_attr
)
2173 newtype
= merge_types (TREE_TYPE (newdecl
), TREE_TYPE (olddecl
));
2175 newtype
= TREE_TYPE (newdecl
);
2177 if (VAR_P (newdecl
))
2179 DECL_THIS_EXTERN (newdecl
) |= DECL_THIS_EXTERN (olddecl
);
2180 /* For already initialized vars, TREE_READONLY could have been
2181 cleared in cp_finish_decl, because the var needs runtime
2182 initialization or destruction. Make sure not to set
2183 TREE_READONLY on it again. */
2184 if (DECL_INITIALIZED_P (olddecl
)
2185 && !DECL_EXTERNAL (olddecl
)
2186 && !TREE_READONLY (olddecl
))
2187 TREE_READONLY (newdecl
) = 0;
2188 DECL_INITIALIZED_P (newdecl
) |= DECL_INITIALIZED_P (olddecl
);
2189 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl
)
2190 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl
);
2191 if (DECL_DEPENDENT_INIT_P (olddecl
))
2192 SET_DECL_DEPENDENT_INIT_P (newdecl
, true);
2193 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl
)
2194 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl
);
2195 if (DECL_CLASS_SCOPE_P (olddecl
))
2196 DECL_DECLARED_CONSTEXPR_P (newdecl
)
2197 |= DECL_DECLARED_CONSTEXPR_P (olddecl
);
2199 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
2200 if (DECL_LANG_SPECIFIC (olddecl
)
2201 && CP_DECL_THREADPRIVATE_P (olddecl
))
2203 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
2204 retrofit_lang_decl (newdecl
);
2205 CP_DECL_THREADPRIVATE_P (newdecl
) = 1;
2209 /* An explicit specialization of a function template or of a member
2210 function of a class template can be declared transaction_safe
2211 independently of whether the corresponding template entity is declared
2212 transaction_safe. */
2213 if (flag_tm
&& TREE_CODE (newdecl
) == FUNCTION_DECL
2214 && DECL_TEMPLATE_INSTANTIATION (olddecl
)
2215 && DECL_TEMPLATE_SPECIALIZATION (newdecl
)
2216 && tx_safe_fn_type_p (newtype
)
2217 && !tx_safe_fn_type_p (TREE_TYPE (newdecl
)))
2218 newtype
= tx_unsafe_fn_variant (newtype
);
2220 TREE_TYPE (newdecl
) = TREE_TYPE (olddecl
) = newtype
;
2222 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2223 check_default_args (newdecl
);
2225 /* Lay the type out, unless already done. */
2226 if (! same_type_p (newtype
, oldtype
)
2227 && TREE_TYPE (newdecl
) != error_mark_node
2228 && !(processing_template_decl
&& uses_template_parms (newdecl
)))
2229 layout_type (TREE_TYPE (newdecl
));
2231 if ((VAR_P (newdecl
)
2232 || TREE_CODE (newdecl
) == PARM_DECL
2233 || TREE_CODE (newdecl
) == RESULT_DECL
2234 || TREE_CODE (newdecl
) == FIELD_DECL
2235 || TREE_CODE (newdecl
) == TYPE_DECL
)
2236 && !(processing_template_decl
&& uses_template_parms (newdecl
)))
2237 layout_decl (newdecl
, 0);
2239 /* Merge deprecatedness. */
2240 if (TREE_DEPRECATED (newdecl
))
2241 TREE_DEPRECATED (olddecl
) = 1;
2243 /* Preserve function specific target and optimization options */
2244 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2246 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl
)
2247 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl
))
2248 DECL_FUNCTION_SPECIFIC_TARGET (newdecl
)
2249 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl
);
2251 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
)
2252 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
))
2253 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
)
2254 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
);
2258 /* Merge the const type qualifier. */
2259 if (TREE_READONLY (newdecl
))
2260 TREE_READONLY (olddecl
) = 1;
2261 /* Merge the volatile type qualifier. */
2262 if (TREE_THIS_VOLATILE (newdecl
))
2263 TREE_THIS_VOLATILE (olddecl
) = 1;
2266 /* Merge the initialization information. */
2267 if (DECL_INITIAL (newdecl
) == NULL_TREE
2268 && DECL_INITIAL (olddecl
) != NULL_TREE
)
2270 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
2271 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
2272 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2274 DECL_SAVED_TREE (newdecl
) = DECL_SAVED_TREE (olddecl
);
2275 DECL_STRUCT_FUNCTION (newdecl
) = DECL_STRUCT_FUNCTION (olddecl
);
2279 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2281 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl
)
2282 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl
);
2283 DECL_NO_LIMIT_STACK (newdecl
) |= DECL_NO_LIMIT_STACK (olddecl
);
2284 DECL_IS_OPERATOR_NEW (newdecl
) |= DECL_IS_OPERATOR_NEW (olddecl
);
2285 DECL_LOOPING_CONST_OR_PURE_P (newdecl
)
2286 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl
);
2289 merge_attribute_bits (newdecl
, olddecl
);
2292 /* Merge the noreturn bit. */
2293 TREE_THIS_VOLATILE (olddecl
) = TREE_THIS_VOLATILE (newdecl
);
2294 TREE_READONLY (olddecl
) = TREE_READONLY (newdecl
);
2295 TREE_NOTHROW (olddecl
) = TREE_NOTHROW (newdecl
);
2296 DECL_IS_MALLOC (olddecl
) = DECL_IS_MALLOC (newdecl
);
2297 DECL_PURE_P (olddecl
) = DECL_PURE_P (newdecl
);
2299 /* Keep the old RTL. */
2300 COPY_DECL_RTL (olddecl
, newdecl
);
2302 else if (VAR_P (newdecl
)
2303 && (DECL_SIZE (olddecl
) || !DECL_SIZE (newdecl
)))
2305 /* Keep the old RTL. We cannot keep the old RTL if the old
2306 declaration was for an incomplete object and the new
2307 declaration is not since many attributes of the RTL will
2309 COPY_DECL_RTL (olddecl
, newdecl
);
2312 /* If cannot merge, then use the new type and qualifiers,
2313 and don't preserve the old rtl. */
2316 /* Clean out any memory we had of the old declaration. */
2317 tree oldstatic
= value_member (olddecl
, static_aggregates
);
2319 TREE_VALUE (oldstatic
) = error_mark_node
;
2321 TREE_TYPE (olddecl
) = TREE_TYPE (newdecl
);
2322 TREE_READONLY (olddecl
) = TREE_READONLY (newdecl
);
2323 TREE_THIS_VOLATILE (olddecl
) = TREE_THIS_VOLATILE (newdecl
);
2324 TREE_NOTHROW (olddecl
) = TREE_NOTHROW (newdecl
);
2325 TREE_SIDE_EFFECTS (olddecl
) = TREE_SIDE_EFFECTS (newdecl
);
2328 /* Merge the storage class information. */
2329 merge_weak (newdecl
, olddecl
);
2331 DECL_DEFER_OUTPUT (newdecl
) |= DECL_DEFER_OUTPUT (olddecl
);
2332 TREE_PUBLIC (newdecl
) = TREE_PUBLIC (olddecl
);
2333 TREE_STATIC (olddecl
) = TREE_STATIC (newdecl
) |= TREE_STATIC (olddecl
);
2334 if (! DECL_EXTERNAL (olddecl
))
2335 DECL_EXTERNAL (newdecl
) = 0;
2336 if (! DECL_COMDAT (olddecl
))
2337 DECL_COMDAT (newdecl
) = 0;
2339 new_template_info
= NULL_TREE
;
2340 if (DECL_LANG_SPECIFIC (newdecl
) && DECL_LANG_SPECIFIC (olddecl
))
2342 bool new_redefines_gnu_inline
= false;
2344 if (new_defines_function
2345 && ((DECL_INTERFACE_KNOWN (olddecl
)
2346 && TREE_CODE (olddecl
) == FUNCTION_DECL
)
2347 || (TREE_CODE (olddecl
) == TEMPLATE_DECL
2348 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl
))
2349 == FUNCTION_DECL
))))
2353 if (TREE_CODE (fn
) == TEMPLATE_DECL
)
2354 fn
= DECL_TEMPLATE_RESULT (olddecl
);
2356 new_redefines_gnu_inline
= GNU_INLINE_P (fn
) && DECL_INITIAL (fn
);
2359 if (!new_redefines_gnu_inline
)
2361 DECL_INTERFACE_KNOWN (newdecl
) |= DECL_INTERFACE_KNOWN (olddecl
);
2362 DECL_NOT_REALLY_EXTERN (newdecl
) |= DECL_NOT_REALLY_EXTERN (olddecl
);
2363 DECL_COMDAT (newdecl
) |= DECL_COMDAT (olddecl
);
2365 DECL_TEMPLATE_INSTANTIATED (newdecl
)
2366 |= DECL_TEMPLATE_INSTANTIATED (olddecl
);
2367 DECL_ODR_USED (newdecl
) |= DECL_ODR_USED (olddecl
);
2369 /* If the OLDDECL is an instantiation and/or specialization,
2370 then the NEWDECL must be too. But, it may not yet be marked
2371 as such if the caller has created NEWDECL, but has not yet
2372 figured out that it is a redeclaration. */
2373 if (!DECL_USE_TEMPLATE (newdecl
))
2374 DECL_USE_TEMPLATE (newdecl
) = DECL_USE_TEMPLATE (olddecl
);
2376 /* Don't really know how much of the language-specific
2377 values we should copy from old to new. */
2378 DECL_IN_AGGR_P (newdecl
) = DECL_IN_AGGR_P (olddecl
);
2379 DECL_REPO_AVAILABLE_P (newdecl
) = DECL_REPO_AVAILABLE_P (olddecl
);
2380 DECL_INITIALIZED_IN_CLASS_P (newdecl
)
2381 |= DECL_INITIALIZED_IN_CLASS_P (olddecl
);
2383 if (LANG_DECL_HAS_MIN (newdecl
))
2385 DECL_LANG_SPECIFIC (newdecl
)->u
.min
.u2
=
2386 DECL_LANG_SPECIFIC (olddecl
)->u
.min
.u2
;
2387 if (DECL_TEMPLATE_INFO (newdecl
))
2389 new_template_info
= DECL_TEMPLATE_INFO (newdecl
);
2390 if (DECL_TEMPLATE_INSTANTIATION (olddecl
)
2391 && DECL_TEMPLATE_SPECIALIZATION (newdecl
))
2392 /* Remember the presence of explicit specialization args. */
2393 TINFO_USED_TEMPLATE_ID (DECL_TEMPLATE_INFO (olddecl
))
2394 = TINFO_USED_TEMPLATE_ID (new_template_info
);
2396 DECL_TEMPLATE_INFO (newdecl
) = DECL_TEMPLATE_INFO (olddecl
);
2398 /* Only functions have these fields. */
2399 if (DECL_DECLARES_FUNCTION_P (newdecl
))
2401 DECL_NONCONVERTING_P (newdecl
) = DECL_NONCONVERTING_P (olddecl
);
2402 DECL_BEFRIENDING_CLASSES (newdecl
)
2403 = chainon (DECL_BEFRIENDING_CLASSES (newdecl
),
2404 DECL_BEFRIENDING_CLASSES (olddecl
));
2405 /* DECL_THUNKS is only valid for virtual functions,
2406 otherwise it is a DECL_FRIEND_CONTEXT. */
2407 if (DECL_VIRTUAL_P (newdecl
))
2408 SET_DECL_THUNKS (newdecl
, DECL_THUNKS (olddecl
));
2410 /* Only variables have this field. */
2411 else if (VAR_P (newdecl
)
2412 && VAR_HAD_UNKNOWN_BOUND (olddecl
))
2413 SET_VAR_HAD_UNKNOWN_BOUND (newdecl
);
2416 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2420 /* Merge parameter attributes. */
2421 tree oldarg
, newarg
;
2422 for (oldarg
= DECL_ARGUMENTS(olddecl
),
2423 newarg
= DECL_ARGUMENTS(newdecl
);
2425 oldarg
= DECL_CHAIN(oldarg
), newarg
= DECL_CHAIN(newarg
)) {
2426 DECL_ATTRIBUTES (newarg
)
2427 = (*targetm
.merge_decl_attributes
) (oldarg
, newarg
);
2428 DECL_ATTRIBUTES (oldarg
) = DECL_ATTRIBUTES (newarg
);
2431 if (DECL_TEMPLATE_INSTANTIATION (olddecl
)
2432 && !DECL_TEMPLATE_INSTANTIATION (newdecl
))
2434 /* If newdecl is not a specialization, then it is not a
2435 template-related function at all. And that means that we
2436 should have exited above, returning 0. */
2437 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl
));
2439 if (DECL_ODR_USED (olddecl
))
2440 /* From [temp.expl.spec]:
2442 If a template, a member template or the member of a class
2443 template is explicitly specialized then that
2444 specialization shall be declared before the first use of
2445 that specialization that would cause an implicit
2446 instantiation to take place, in every translation unit in
2447 which such a use occurs. */
2448 error ("explicit specialization of %qD after first use",
2451 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl
);
2452 DECL_COMDAT (newdecl
) = (TREE_PUBLIC (newdecl
)
2453 && DECL_DECLARED_INLINE_P (newdecl
));
2455 /* Don't propagate visibility from the template to the
2456 specialization here. We'll do that in determine_visibility if
2458 DECL_VISIBILITY_SPECIFIED (olddecl
) = 0;
2460 /* [temp.expl.spec/14] We don't inline explicit specialization
2461 just because the primary template says so. */
2462 gcc_assert (!merge_attr
);
2464 DECL_DECLARED_INLINE_P (olddecl
)
2465 = DECL_DECLARED_INLINE_P (newdecl
);
2467 DECL_DISREGARD_INLINE_LIMITS (olddecl
)
2468 = DECL_DISREGARD_INLINE_LIMITS (newdecl
);
2470 DECL_UNINLINABLE (olddecl
) = DECL_UNINLINABLE (newdecl
);
2472 else if (new_defines_function
&& DECL_INITIAL (olddecl
))
2474 /* Never inline re-defined extern inline functions.
2475 FIXME: this could be better handled by keeping both
2476 function as separate declarations. */
2477 DECL_UNINLINABLE (newdecl
) = 1;
2481 if (DECL_PENDING_INLINE_P (olddecl
))
2483 DECL_PENDING_INLINE_P (newdecl
) = 1;
2484 DECL_PENDING_INLINE_INFO (newdecl
)
2485 = DECL_PENDING_INLINE_INFO (olddecl
);
2487 else if (DECL_PENDING_INLINE_P (newdecl
))
2489 else if (DECL_SAVED_FUNCTION_DATA (newdecl
) == NULL
)
2490 DECL_SAVED_FUNCTION_DATA (newdecl
)
2491 = DECL_SAVED_FUNCTION_DATA (olddecl
);
2493 DECL_DECLARED_INLINE_P (newdecl
) |= DECL_DECLARED_INLINE_P (olddecl
);
2495 DECL_UNINLINABLE (newdecl
) = DECL_UNINLINABLE (olddecl
)
2496 = (DECL_UNINLINABLE (newdecl
) || DECL_UNINLINABLE (olddecl
));
2498 DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2499 = DECL_DISREGARD_INLINE_LIMITS (olddecl
)
2500 = (DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2501 || DECL_DISREGARD_INLINE_LIMITS (olddecl
));
2504 /* Preserve abstractness on cloned [cd]tors. */
2505 DECL_ABSTRACT_P (newdecl
) = DECL_ABSTRACT_P (olddecl
);
2507 /* Update newdecl's parms to point at olddecl. */
2508 for (parm
= DECL_ARGUMENTS (newdecl
); parm
;
2509 parm
= DECL_CHAIN (parm
))
2510 DECL_CONTEXT (parm
) = olddecl
;
2514 SET_DECL_LANGUAGE (olddecl
, DECL_LANGUAGE (newdecl
));
2515 COPY_DECL_ASSEMBLER_NAME (newdecl
, olddecl
);
2516 COPY_DECL_RTL (newdecl
, olddecl
);
2518 if (! types_match
|| new_defines_function
)
2520 /* These need to be copied so that the names are available.
2521 Note that if the types do match, we'll preserve inline
2522 info and other bits, but if not, we won't. */
2523 DECL_ARGUMENTS (olddecl
) = DECL_ARGUMENTS (newdecl
);
2524 DECL_RESULT (olddecl
) = DECL_RESULT (newdecl
);
2526 /* If redeclaring a builtin function, it stays built in
2527 if newdecl is a gnu_inline definition, or if newdecl is just
2529 if (DECL_BUILT_IN (olddecl
)
2530 && (new_defines_function
? GNU_INLINE_P (newdecl
) : types_match
))
2532 DECL_BUILT_IN_CLASS (newdecl
) = DECL_BUILT_IN_CLASS (olddecl
);
2533 DECL_FUNCTION_CODE (newdecl
) = DECL_FUNCTION_CODE (olddecl
);
2534 /* If we're keeping the built-in definition, keep the rtl,
2535 regardless of declaration matches. */
2536 COPY_DECL_RTL (olddecl
, newdecl
);
2537 if (DECL_BUILT_IN_CLASS (newdecl
) == BUILT_IN_NORMAL
)
2539 enum built_in_function fncode
= DECL_FUNCTION_CODE (newdecl
);
2542 /* If a compatible prototype of these builtin functions
2543 is seen, assume the runtime implements it with the
2544 expected semantics. */
2545 case BUILT_IN_STPCPY
:
2546 if (builtin_decl_explicit_p (fncode
))
2547 set_builtin_decl_implicit_p (fncode
, true);
2550 if (builtin_decl_explicit_p (fncode
))
2551 set_builtin_decl_declared_p (fncode
, true);
2556 copy_attributes_to_builtin (newdecl
);
2558 if (new_defines_function
)
2559 /* If defining a function declared with other language
2560 linkage, use the previously declared language linkage. */
2561 SET_DECL_LANGUAGE (newdecl
, DECL_LANGUAGE (olddecl
));
2562 else if (types_match
)
2564 DECL_RESULT (newdecl
) = DECL_RESULT (olddecl
);
2565 /* Don't clear out the arguments if we're just redeclaring a
2567 if (DECL_ARGUMENTS (olddecl
))
2568 DECL_ARGUMENTS (newdecl
) = DECL_ARGUMENTS (olddecl
);
2571 else if (TREE_CODE (newdecl
) == NAMESPACE_DECL
)
2572 NAMESPACE_LEVEL (newdecl
) = NAMESPACE_LEVEL (olddecl
);
2574 /* Now preserve various other info from the definition. */
2575 TREE_ADDRESSABLE (newdecl
) = TREE_ADDRESSABLE (olddecl
);
2576 TREE_ASM_WRITTEN (newdecl
) = TREE_ASM_WRITTEN (olddecl
);
2577 DECL_COMMON (newdecl
) = DECL_COMMON (olddecl
);
2578 COPY_DECL_ASSEMBLER_NAME (olddecl
, newdecl
);
2580 /* Warn about conflicting visibility specifications. */
2581 if (DECL_VISIBILITY_SPECIFIED (olddecl
)
2582 && DECL_VISIBILITY_SPECIFIED (newdecl
)
2583 && DECL_VISIBILITY (newdecl
) != DECL_VISIBILITY (olddecl
))
2585 if (warning_at (DECL_SOURCE_LOCATION (newdecl
), OPT_Wattributes
,
2586 "%qD: visibility attribute ignored because it "
2587 "conflicts with previous declaration", newdecl
))
2588 inform (DECL_SOURCE_LOCATION (olddecl
),
2589 "previous declaration of %qD", olddecl
);
2591 /* Choose the declaration which specified visibility. */
2592 if (DECL_VISIBILITY_SPECIFIED (olddecl
))
2594 DECL_VISIBILITY (newdecl
) = DECL_VISIBILITY (olddecl
);
2595 DECL_VISIBILITY_SPECIFIED (newdecl
) = 1;
2597 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2598 so keep this behavior. */
2599 if (VAR_P (newdecl
) && DECL_HAS_INIT_PRIORITY_P (newdecl
))
2601 SET_DECL_INIT_PRIORITY (olddecl
, DECL_INIT_PRIORITY (newdecl
));
2602 DECL_HAS_INIT_PRIORITY_P (olddecl
) = 1;
2604 /* Likewise for DECL_ALIGN, DECL_USER_ALIGN and DECL_PACKED. */
2605 if (DECL_ALIGN (olddecl
) > DECL_ALIGN (newdecl
))
2607 SET_DECL_ALIGN (newdecl
, DECL_ALIGN (olddecl
));
2608 DECL_USER_ALIGN (newdecl
) |= DECL_USER_ALIGN (olddecl
);
2610 DECL_USER_ALIGN (olddecl
) = DECL_USER_ALIGN (newdecl
);
2611 if (DECL_WARN_IF_NOT_ALIGN (olddecl
)
2612 > DECL_WARN_IF_NOT_ALIGN (newdecl
))
2613 SET_DECL_WARN_IF_NOT_ALIGN (newdecl
,
2614 DECL_WARN_IF_NOT_ALIGN (olddecl
));
2615 if (TREE_CODE (newdecl
) == FIELD_DECL
)
2616 DECL_PACKED (olddecl
) = DECL_PACKED (newdecl
);
2618 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2619 with that from NEWDECL below. */
2620 if (DECL_LANG_SPECIFIC (olddecl
))
2622 gcc_assert (DECL_LANG_SPECIFIC (olddecl
)
2623 != DECL_LANG_SPECIFIC (newdecl
));
2624 ggc_free (DECL_LANG_SPECIFIC (olddecl
));
2627 /* Merge the USED information. */
2628 if (TREE_USED (olddecl
))
2629 TREE_USED (newdecl
) = 1;
2630 else if (TREE_USED (newdecl
))
2631 TREE_USED (olddecl
) = 1;
2632 if (VAR_P (newdecl
))
2634 if (DECL_READ_P (olddecl
))
2635 DECL_READ_P (newdecl
) = 1;
2636 else if (DECL_READ_P (newdecl
))
2637 DECL_READ_P (olddecl
) = 1;
2639 if (DECL_PRESERVE_P (olddecl
))
2640 DECL_PRESERVE_P (newdecl
) = 1;
2641 else if (DECL_PRESERVE_P (newdecl
))
2642 DECL_PRESERVE_P (olddecl
) = 1;
2644 /* Merge the DECL_FUNCTION_VERSIONED information. newdecl will be copied
2645 to olddecl and deleted. */
2646 if (TREE_CODE (newdecl
) == FUNCTION_DECL
2647 && DECL_FUNCTION_VERSIONED (olddecl
))
2649 /* Set the flag for newdecl so that it gets copied to olddecl. */
2650 DECL_FUNCTION_VERSIONED (newdecl
) = 1;
2651 /* newdecl will be purged after copying to olddecl and is no longer
2653 cgraph_node::delete_function_version_by_decl (newdecl
);
2656 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2659 struct symtab_node
*snode
= symtab_node::get (olddecl
);
2661 function_size
= sizeof (struct tree_decl_common
);
2663 memcpy ((char *) olddecl
+ sizeof (struct tree_common
),
2664 (char *) newdecl
+ sizeof (struct tree_common
),
2665 function_size
- sizeof (struct tree_common
));
2667 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2668 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2669 sizeof (struct tree_function_decl
) - sizeof (struct tree_decl_common
));
2671 /* Preserve symtab node mapping. */
2672 olddecl
->decl_with_vis
.symtab_node
= snode
;
2674 if (new_template_info
)
2675 /* If newdecl is a template instantiation, it is possible that
2676 the following sequence of events has occurred:
2678 o A friend function was declared in a class template. The
2679 class template was instantiated.
2681 o The instantiation of the friend declaration was
2682 recorded on the instantiation list, and is newdecl.
2684 o Later, however, instantiate_class_template called pushdecl
2685 on the newdecl to perform name injection. But, pushdecl in
2686 turn called duplicate_decls when it discovered that another
2687 declaration of a global function with the same name already
2690 o Here, in duplicate_decls, we decided to clobber newdecl.
2692 If we're going to do that, we'd better make sure that
2693 olddecl, and not newdecl, is on the list of
2694 instantiations so that if we try to do the instantiation
2695 again we won't get the clobbered declaration. */
2696 reregister_specialization (newdecl
,
2702 size_t size
= tree_code_size (TREE_CODE (newdecl
));
2704 memcpy ((char *) olddecl
+ sizeof (struct tree_common
),
2705 (char *) newdecl
+ sizeof (struct tree_common
),
2706 sizeof (struct tree_decl_common
) - sizeof (struct tree_common
));
2707 switch (TREE_CODE (newdecl
))
2717 struct symtab_node
*snode
= NULL
;
2720 && (TREE_STATIC (olddecl
) || TREE_PUBLIC (olddecl
)
2721 || DECL_EXTERNAL (olddecl
)))
2722 snode
= symtab_node::get (olddecl
);
2723 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2724 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2725 size
- sizeof (struct tree_decl_common
)
2726 + TREE_CODE_LENGTH (TREE_CODE (newdecl
)) * sizeof (char *));
2727 if (VAR_P (newdecl
))
2728 olddecl
->decl_with_vis
.symtab_node
= snode
;
2732 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2733 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2734 sizeof (struct tree_decl_non_common
) - sizeof (struct tree_decl_common
)
2735 + TREE_CODE_LENGTH (TREE_CODE (newdecl
)) * sizeof (char *));
2740 if (VAR_OR_FUNCTION_DECL_P (newdecl
))
2742 if (DECL_EXTERNAL (olddecl
)
2743 || TREE_PUBLIC (olddecl
)
2744 || TREE_STATIC (olddecl
))
2746 /* Merge the section attribute.
2747 We want to issue an error if the sections conflict but that must be
2748 done later in decl_attributes since we are called before attributes
2750 if (DECL_SECTION_NAME (newdecl
) != NULL
)
2751 set_decl_section_name (olddecl
, DECL_SECTION_NAME (newdecl
));
2753 if (DECL_ONE_ONLY (newdecl
))
2755 struct symtab_node
*oldsym
, *newsym
;
2756 if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
2757 oldsym
= cgraph_node::get_create (olddecl
);
2759 oldsym
= varpool_node::get_create (olddecl
);
2760 newsym
= symtab_node::get (newdecl
);
2761 oldsym
->set_comdat_group (newsym
->get_comdat_group ());
2766 && CP_DECL_THREAD_LOCAL_P (newdecl
))
2768 CP_DECL_THREAD_LOCAL_P (olddecl
) = true;
2769 if (!processing_template_decl
)
2770 set_decl_tls_model (olddecl
, DECL_TLS_MODEL (newdecl
));
2774 DECL_UID (olddecl
) = olddecl_uid
;
2776 DECL_FRIEND_P (olddecl
) = 1;
2779 DECL_ANTICIPATED (olddecl
) = 1;
2780 DECL_HIDDEN_FRIEND_P (olddecl
) = 1;
2783 /* NEWDECL contains the merged attribute lists.
2784 Update OLDDECL to be the same. */
2785 DECL_ATTRIBUTES (olddecl
) = DECL_ATTRIBUTES (newdecl
);
2787 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2788 so that encode_section_info has a chance to look at the new decl
2789 flags and attributes. */
2790 if (DECL_RTL_SET_P (olddecl
)
2791 && (TREE_CODE (olddecl
) == FUNCTION_DECL
2793 && TREE_STATIC (olddecl
))))
2794 make_decl_rtl (olddecl
);
2796 /* The NEWDECL will no longer be needed. Because every out-of-class
2797 declaration of a member results in a call to duplicate_decls,
2798 freeing these nodes represents in a significant savings.
2800 Before releasing the node, be sore to remove function from symbol
2801 table that might have been inserted there to record comdat group.
2802 Be sure to however do not free DECL_STRUCT_FUNCTION because this
2803 structure is shared in between newdecl and oldecl. */
2804 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2805 DECL_STRUCT_FUNCTION (newdecl
) = NULL
;
2806 if (VAR_OR_FUNCTION_DECL_P (newdecl
))
2808 struct symtab_node
*snode
= symtab_node::get (newdecl
);
2813 /* Remove the associated constraints for newdecl, if any, before
2814 reclaiming memory. */
2816 remove_constraints (newdecl
);
2823 /* Return zero if the declaration NEWDECL is valid
2824 when the declaration OLDDECL (assumed to be for the same name)
2825 has already been seen.
2826 Otherwise return an error message format string with a %s
2827 where the identifier should go. */
2830 redeclaration_error_message (tree newdecl
, tree olddecl
)
2832 if (TREE_CODE (newdecl
) == TYPE_DECL
)
2834 /* Because C++ can put things into name space for free,
2835 constructs like "typedef struct foo { ... } foo"
2836 would look like an erroneous redeclaration. */
2837 if (same_type_p (TREE_TYPE (newdecl
), TREE_TYPE (olddecl
)))
2840 return G_("redefinition of %q#D");
2842 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2844 /* If this is a pure function, its olddecl will actually be
2845 the original initialization to `0' (which we force to call
2846 abort()). Don't complain about redefinition in this case. */
2847 if (DECL_LANG_SPECIFIC (olddecl
) && DECL_PURE_VIRTUAL_P (olddecl
)
2848 && DECL_INITIAL (olddecl
) == NULL_TREE
)
2851 /* If both functions come from different namespaces, this is not
2852 a redeclaration - this is a conflict with a used function. */
2853 if (DECL_NAMESPACE_SCOPE_P (olddecl
)
2854 && DECL_CONTEXT (olddecl
) != DECL_CONTEXT (newdecl
)
2855 && ! decls_match (olddecl
, newdecl
))
2856 return G_("%qD conflicts with used function");
2858 /* We'll complain about linkage mismatches in
2859 warn_extern_redeclared_static. */
2861 /* Defining the same name twice is no good. */
2862 if (decl_defined_p (olddecl
)
2863 && decl_defined_p (newdecl
))
2865 if (DECL_NAME (olddecl
) == NULL_TREE
)
2866 return G_("%q#D not declared in class");
2867 else if (!GNU_INLINE_P (olddecl
)
2868 || GNU_INLINE_P (newdecl
))
2869 return G_("redefinition of %q#D");
2872 if (DECL_DECLARED_INLINE_P (olddecl
) && DECL_DECLARED_INLINE_P (newdecl
))
2874 bool olda
= GNU_INLINE_P (olddecl
);
2875 bool newa
= GNU_INLINE_P (newdecl
);
2880 return G_("%q+D redeclared inline with "
2881 "%<gnu_inline%> attribute");
2883 return G_("%q+D redeclared inline without "
2884 "%<gnu_inline%> attribute");
2888 check_abi_tag_redeclaration
2889 (olddecl
, lookup_attribute ("abi_tag", DECL_ATTRIBUTES (olddecl
)),
2890 lookup_attribute ("abi_tag", DECL_ATTRIBUTES (newdecl
)));
2894 else if (TREE_CODE (newdecl
) == TEMPLATE_DECL
)
2898 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) == TYPE_DECL
)
2900 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl
))
2901 && COMPLETE_TYPE_P (TREE_TYPE (olddecl
)))
2902 return G_("redefinition of %q#D");
2906 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) != FUNCTION_DECL
2907 || (DECL_TEMPLATE_RESULT (newdecl
)
2908 == DECL_TEMPLATE_RESULT (olddecl
)))
2911 nt
= DECL_TEMPLATE_RESULT (newdecl
);
2912 if (DECL_TEMPLATE_INFO (nt
))
2913 nt
= DECL_TEMPLATE_RESULT (template_for_substitution (nt
));
2914 ot
= DECL_TEMPLATE_RESULT (olddecl
);
2915 if (DECL_TEMPLATE_INFO (ot
))
2916 ot
= DECL_TEMPLATE_RESULT (template_for_substitution (ot
));
2917 if (DECL_INITIAL (nt
) && DECL_INITIAL (ot
)
2918 && (!GNU_INLINE_P (ot
) || GNU_INLINE_P (nt
)))
2919 return G_("redefinition of %q#D");
2921 if (DECL_DECLARED_INLINE_P (ot
) && DECL_DECLARED_INLINE_P (nt
))
2923 bool olda
= GNU_INLINE_P (ot
);
2924 bool newa
= GNU_INLINE_P (nt
);
2929 return G_("%q+D redeclared inline with "
2930 "%<gnu_inline%> attribute");
2932 return G_("%q+D redeclared inline without "
2933 "%<gnu_inline%> attribute");
2937 /* Core issue #226 (C++0x):
2939 If a friend function template declaration specifies a
2940 default template-argument, that declaration shall be a
2941 definition and shall be the only declaration of the
2942 function template in the translation unit. */
2943 if ((cxx_dialect
!= cxx98
)
2944 && TREE_CODE (ot
) == FUNCTION_DECL
&& DECL_FRIEND_P (ot
)
2945 && !check_default_tmpl_args (nt
, DECL_TEMPLATE_PARMS (newdecl
),
2946 /*is_primary=*/true,
2947 /*is_partial=*/false,
2948 /*is_friend_decl=*/2))
2949 return G_("redeclaration of friend %q#D "
2950 "may not have default template arguments");
2954 else if (VAR_P (newdecl
)
2955 && CP_DECL_THREAD_LOCAL_P (newdecl
) != CP_DECL_THREAD_LOCAL_P (olddecl
)
2956 && (! DECL_LANG_SPECIFIC (olddecl
)
2957 || ! CP_DECL_THREADPRIVATE_P (olddecl
)
2958 || CP_DECL_THREAD_LOCAL_P (newdecl
)))
2960 /* Only variables can be thread-local, and all declarations must
2961 agree on this property. */
2962 if (CP_DECL_THREAD_LOCAL_P (newdecl
))
2963 return G_("thread-local declaration of %q#D follows "
2964 "non-thread-local declaration");
2966 return G_("non-thread-local declaration of %q#D follows "
2967 "thread-local declaration");
2969 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl
))
2971 /* The objects have been declared at namespace scope. If either
2972 is a member of an anonymous union, then this is an invalid
2973 redeclaration. For example:
2979 if ((VAR_P (newdecl
) && DECL_ANON_UNION_VAR_P (newdecl
))
2980 || (VAR_P (olddecl
) && DECL_ANON_UNION_VAR_P (olddecl
)))
2981 return G_("redeclaration of %q#D");
2982 /* If at least one declaration is a reference, there is no
2983 conflict. For example:
2989 if (DECL_EXTERNAL (newdecl
) || DECL_EXTERNAL (olddecl
))
2992 /* Static data member declared outside a class definition
2993 if the variable is defined within the class with constexpr
2994 specifier is declaration rather than definition (and
2996 if (cxx_dialect
>= cxx17
2998 && DECL_CLASS_SCOPE_P (olddecl
)
2999 && DECL_DECLARED_CONSTEXPR_P (olddecl
)
3000 && !DECL_INITIAL (newdecl
))
3002 DECL_EXTERNAL (newdecl
) = 1;
3003 /* For now, only warn with explicit -Wdeprecated. */
3004 if (global_options_set
.x_warn_deprecated
3005 && warning_at (DECL_SOURCE_LOCATION (newdecl
), OPT_Wdeprecated
,
3006 "redundant redeclaration of %<constexpr%> static "
3007 "data member %qD", newdecl
))
3008 inform (DECL_SOURCE_LOCATION (olddecl
),
3009 "previous declaration of %qD", olddecl
);
3013 /* Reject two definitions. */
3014 return G_("redefinition of %q#D");
3018 /* Objects declared with block scope: */
3019 /* Reject two definitions, and reject a definition
3020 together with an external reference. */
3021 if (!(DECL_EXTERNAL (newdecl
) && DECL_EXTERNAL (olddecl
)))
3022 return G_("redeclaration of %q#D");
3028 /* Hash and equality functions for the named_label table. */
3031 named_label_hash::hash (const value_type entry
)
3033 return IDENTIFIER_HASH_VALUE (entry
->name
);
3037 named_label_hash::equal (const value_type entry
, compare_type name
)
3039 return name
== entry
->name
;
3042 /* Look for a label named ID in the current function. If one cannot
3043 be found, create one. Return the named_label_entry, or NULL on
3046 static named_label_entry
*
3047 lookup_label_1 (tree id
, bool making_local_p
)
3049 /* You can't use labels at global scope. */
3050 if (current_function_decl
== NULL_TREE
)
3052 error ("label %qE referenced outside of any function", id
);
3057 named_labels
= hash_table
<named_label_hash
>::create_ggc (13);
3059 hashval_t hash
= IDENTIFIER_HASH_VALUE (id
);
3060 named_label_entry
**slot
3061 = named_labels
->find_slot_with_hash (id
, hash
, INSERT
);
3062 named_label_entry
*old
= *slot
;
3064 if (old
&& old
->label_decl
)
3066 if (!making_local_p
)
3069 if (old
->binding_level
== current_binding_level
)
3071 error ("local label %qE conflicts with existing label", id
);
3072 inform (DECL_SOURCE_LOCATION (old
->label_decl
), "previous label");
3077 /* We are making a new decl, create or reuse the named_label_entry */
3078 named_label_entry
*ent
= NULL
;
3079 if (old
&& !old
->label_decl
)
3083 ent
= ggc_cleared_alloc
<named_label_entry
> ();
3089 /* Now create the LABEL_DECL. */
3090 tree decl
= build_decl (input_location
, LABEL_DECL
, id
, void_type_node
);
3092 DECL_CONTEXT (decl
) = current_function_decl
;
3093 SET_DECL_MODE (decl
, VOIDmode
);
3096 C_DECLARED_LABEL_FLAG (decl
) = true;
3097 DECL_CHAIN (decl
) = current_binding_level
->names
;
3098 current_binding_level
->names
= decl
;
3101 ent
->label_decl
= decl
;
3106 /* Wrapper for lookup_label_1. */
3109 lookup_label (tree id
)
3111 bool subtime
= timevar_cond_start (TV_NAME_LOOKUP
);
3112 named_label_entry
*ent
= lookup_label_1 (id
, false);
3113 timevar_cond_stop (TV_NAME_LOOKUP
, subtime
);
3114 return ent
? ent
->label_decl
: NULL_TREE
;
3118 declare_local_label (tree id
)
3120 bool subtime
= timevar_cond_start (TV_NAME_LOOKUP
);
3121 named_label_entry
*ent
= lookup_label_1 (id
, true);
3122 timevar_cond_stop (TV_NAME_LOOKUP
, subtime
);
3123 return ent
? ent
->label_decl
: NULL_TREE
;
3126 /* Returns nonzero if it is ill-formed to jump past the declaration of
3127 DECL. Returns 2 if it's also a real problem. */
3130 decl_jump_unsafe (tree decl
)
3132 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
3133 with automatic storage duration is not in scope to a point where it is
3134 in scope is ill-formed unless the variable has scalar type, class type
3135 with a trivial default constructor and a trivial destructor, a
3136 cv-qualified version of one of these types, or an array of one of the
3137 preceding types and is declared without an initializer (8.5). */
3138 tree type
= TREE_TYPE (decl
);
3140 if (!VAR_P (decl
) || TREE_STATIC (decl
)
3141 || type
== error_mark_node
)
3144 if (DECL_NONTRIVIALLY_INITIALIZED_P (decl
)
3145 || variably_modified_type_p (type
, NULL_TREE
))
3148 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
))
3154 /* A subroutine of check_previous_goto_1 and check_goto to identify a branch
3158 identify_goto (tree decl
, location_t loc
, const location_t
*locus
,
3159 diagnostic_t diag_kind
)
3162 = emit_diagnostic (diag_kind
, loc
, 0,
3163 decl
? N_("jump to label %qD")
3164 : N_("jump to case label"), decl
);
3165 if (complained
&& locus
)
3166 inform (*locus
, " from here");
3170 /* Check that a single previously seen jump to a newly defined label
3171 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
3172 the jump context; NAMES are the names in scope in LEVEL at the jump
3173 context; LOCUS is the source position of the jump or 0. Returns
3174 true if all is well. */
3177 check_previous_goto_1 (tree decl
, cp_binding_level
* level
, tree names
,
3178 bool exited_omp
, const location_t
*locus
)
3180 cp_binding_level
*b
;
3181 bool complained
= false;
3183 bool saw_eh
= false, saw_omp
= false, saw_tm
= false, saw_cxif
= false;
3187 complained
= identify_goto (decl
, input_location
, locus
, DK_ERROR
);
3189 inform (input_location
, " exits OpenMP structured block");
3194 for (b
= current_binding_level
; b
; b
= b
->level_chain
)
3196 tree new_decls
, old_decls
= (b
== level
? names
: NULL_TREE
);
3198 for (new_decls
= b
->names
; new_decls
!= old_decls
;
3199 new_decls
= (DECL_P (new_decls
) ? DECL_CHAIN (new_decls
)
3200 : TREE_CHAIN (new_decls
)))
3202 int problem
= decl_jump_unsafe (new_decls
);
3208 complained
= identify_goto (decl
, input_location
, locus
,
3215 inform (DECL_SOURCE_LOCATION (new_decls
),
3216 " crosses initialization of %q#D", new_decls
);
3218 inform (DECL_SOURCE_LOCATION (new_decls
),
3219 " enters scope of %q#D, which has "
3220 "non-trivial destructor", new_decls
);
3227 const char *inf
= NULL
;
3228 location_t loc
= input_location
;
3233 inf
= N_("enters try block");
3239 inf
= N_("enters catch block");
3245 inf
= N_("enters OpenMP structured block");
3249 case sk_transaction
:
3251 inf
= N_("enters synchronized or atomic statement");
3256 if (!saw_cxif
&& level_for_constexpr_if (b
->level_chain
))
3258 inf
= N_("enters constexpr if statement");
3259 loc
= EXPR_LOCATION (b
->level_chain
->this_entity
);
3271 complained
= identify_goto (decl
, input_location
, locus
, DK_ERROR
);
3274 inform (loc
, " %s", inf
);
3282 check_previous_goto (tree decl
, struct named_label_use_entry
*use
)
3284 check_previous_goto_1 (decl
, use
->binding_level
,
3285 use
->names_in_scope
, use
->in_omp_scope
,
3286 &use
->o_goto_locus
);
3290 check_switch_goto (cp_binding_level
* level
)
3292 return check_previous_goto_1 (NULL_TREE
, level
, level
->names
, false, NULL
);
3295 /* Check that a new jump to a label DECL is OK. Called by
3296 finish_goto_stmt. */
3299 check_goto (tree decl
)
3301 /* We can't know where a computed goto is jumping.
3302 So we assume that it's OK. */
3303 if (TREE_CODE (decl
) != LABEL_DECL
)
3306 /* We didn't record any information about this label when we created it,
3307 and there's not much point since it's trivial to analyze as a return. */
3308 if (decl
== cdtor_label
)
3311 hashval_t hash
= IDENTIFIER_HASH_VALUE (DECL_NAME (decl
));
3312 named_label_entry
**slot
3313 = named_labels
->find_slot_with_hash (DECL_NAME (decl
), hash
, NO_INSERT
);
3314 named_label_entry
*ent
= *slot
;
3316 /* If the label hasn't been defined yet, defer checking. */
3317 if (! DECL_INITIAL (decl
))
3319 /* Don't bother creating another use if the last goto had the
3320 same data, and will therefore create the same set of errors. */
3322 && ent
->uses
->names_in_scope
== current_binding_level
->names
)
3325 named_label_use_entry
*new_use
3326 = ggc_alloc
<named_label_use_entry
> ();
3327 new_use
->binding_level
= current_binding_level
;
3328 new_use
->names_in_scope
= current_binding_level
->names
;
3329 new_use
->o_goto_locus
= input_location
;
3330 new_use
->in_omp_scope
= false;
3332 new_use
->next
= ent
->uses
;
3333 ent
->uses
= new_use
;
3337 bool saw_catch
= false, complained
= false;
3342 if (ent
->in_try_scope
|| ent
->in_catch_scope
|| ent
->in_transaction_scope
3343 || ent
->in_constexpr_if
3344 || ent
->in_omp_scope
|| !vec_safe_is_empty (ent
->bad_decls
))
3346 diagnostic_t diag_kind
= DK_PERMERROR
;
3347 if (ent
->in_try_scope
|| ent
->in_catch_scope
|| ent
->in_constexpr_if
3348 || ent
->in_transaction_scope
|| ent
->in_omp_scope
)
3349 diag_kind
= DK_ERROR
;
3350 complained
= identify_goto (decl
, DECL_SOURCE_LOCATION (decl
),
3351 &input_location
, diag_kind
);
3352 identified
= 1 + (diag_kind
== DK_ERROR
);
3355 FOR_EACH_VEC_SAFE_ELT (ent
->bad_decls
, ix
, bad
)
3357 int u
= decl_jump_unsafe (bad
);
3359 if (u
> 1 && DECL_ARTIFICIAL (bad
))
3361 /* Can't skip init of __exception_info. */
3362 if (identified
== 1)
3364 complained
= identify_goto (decl
, DECL_SOURCE_LOCATION (decl
),
3365 &input_location
, DK_ERROR
);
3369 inform (DECL_SOURCE_LOCATION (bad
), " enters catch block");
3372 else if (complained
)
3375 inform (DECL_SOURCE_LOCATION (bad
),
3376 " skips initialization of %q#D", bad
);
3378 inform (DECL_SOURCE_LOCATION (bad
),
3379 " enters scope of %q#D which has "
3380 "non-trivial destructor", bad
);
3386 if (ent
->in_try_scope
)
3387 inform (input_location
, " enters try block");
3388 else if (ent
->in_catch_scope
&& !saw_catch
)
3389 inform (input_location
, " enters catch block");
3390 else if (ent
->in_transaction_scope
)
3391 inform (input_location
, " enters synchronized or atomic statement");
3392 else if (ent
->in_constexpr_if
)
3393 inform (input_location
, " enters %<constexpr%> if statement");
3396 if (ent
->in_omp_scope
)
3399 inform (input_location
, " enters OpenMP structured block");
3401 else if (flag_openmp
)
3402 for (cp_binding_level
*b
= current_binding_level
; b
; b
= b
->level_chain
)
3404 if (b
== ent
->binding_level
)
3406 if (b
->kind
== sk_omp
)
3410 complained
= identify_goto (decl
,
3411 DECL_SOURCE_LOCATION (decl
),
3412 &input_location
, DK_ERROR
);
3416 inform (input_location
, " exits OpenMP structured block");
3422 /* Check that a return is ok wrt OpenMP structured blocks.
3423 Called by finish_return_stmt. Returns true if all is well. */
3426 check_omp_return (void)
3428 for (cp_binding_level
*b
= current_binding_level
; b
; b
= b
->level_chain
)
3429 if (b
->kind
== sk_omp
)
3431 error ("invalid exit from OpenMP structured block");
3434 else if (b
->kind
== sk_function_parms
)
3439 /* Define a label, specifying the location in the source file.
3440 Return the LABEL_DECL node for the label. */
3443 define_label_1 (location_t location
, tree name
)
3445 /* After labels, make any new cleanups in the function go into their
3446 own new (temporary) binding contour. */
3447 for (cp_binding_level
*p
= current_binding_level
;
3448 p
->kind
!= sk_function_parms
;
3450 p
->more_cleanups_ok
= 0;
3452 named_label_entry
*ent
= lookup_label_1 (name
, false);
3453 tree decl
= ent
->label_decl
;
3455 if (DECL_INITIAL (decl
) != NULL_TREE
)
3457 error ("duplicate label %qD", decl
);
3458 return error_mark_node
;
3462 /* Mark label as having been defined. */
3463 DECL_INITIAL (decl
) = error_mark_node
;
3464 /* Say where in the source. */
3465 DECL_SOURCE_LOCATION (decl
) = location
;
3467 ent
->binding_level
= current_binding_level
;
3468 ent
->names_in_scope
= current_binding_level
->names
;
3470 for (named_label_use_entry
*use
= ent
->uses
; use
; use
= use
->next
)
3471 check_previous_goto (decl
, use
);
3478 /* Wrapper for define_label_1. */
3481 define_label (location_t location
, tree name
)
3483 bool running
= timevar_cond_start (TV_NAME_LOOKUP
);
3484 tree ret
= define_label_1 (location
, name
);
3485 timevar_cond_stop (TV_NAME_LOOKUP
, running
);
3492 cp_binding_level
*level
;
3493 struct cp_switch
*next
;
3494 /* The SWITCH_STMT being built. */
3496 /* A splay-tree mapping the low element of a case range to the high
3497 element, or NULL_TREE if there is no high element. Used to
3498 determine whether or not a new case label duplicates an old case
3499 label. We need a tree, rather than simply a hash table, because
3500 of the GNU case range extension. */
3502 /* Remember whether there was a case value that is outside the
3503 range of the original type of the controlling expression. */
3504 bool outside_range_p
;
3505 /* Remember whether a default: case label has been seen. */
3507 /* Remember whether a BREAK_STMT has been seen in this SWITCH_STMT. */
3508 bool break_stmt_seen_p
;
3509 /* Set if inside of {FOR,DO,WHILE}_BODY nested inside of a switch,
3510 where BREAK_STMT doesn't belong to the SWITCH_STMT. */
3511 bool in_loop_body_p
;
3514 /* A stack of the currently active switch statements. The innermost
3515 switch statement is on the top of the stack. There is no need to
3516 mark the stack for garbage collection because it is only active
3517 during the processing of the body of a function, and we never
3518 collect at that point. */
3520 static struct cp_switch
*switch_stack
;
3522 /* Called right after a switch-statement condition is parsed.
3523 SWITCH_STMT is the switch statement being parsed. */
3526 push_switch (tree switch_stmt
)
3528 struct cp_switch
*p
= XNEW (struct cp_switch
);
3529 p
->level
= current_binding_level
;
3530 p
->next
= switch_stack
;
3531 p
->switch_stmt
= switch_stmt
;
3532 p
->cases
= splay_tree_new (case_compare
, NULL
, NULL
);
3533 p
->outside_range_p
= false;
3534 p
->has_default_p
= false;
3535 p
->break_stmt_seen_p
= false;
3536 p
->in_loop_body_p
= false;
3543 struct cp_switch
*cs
= switch_stack
;
3544 location_t switch_location
;
3546 /* Emit warnings as needed. */
3547 switch_location
= EXPR_LOC_OR_LOC (cs
->switch_stmt
, input_location
);
3548 const bool bool_cond_p
3549 = (SWITCH_STMT_TYPE (cs
->switch_stmt
)
3550 && TREE_CODE (SWITCH_STMT_TYPE (cs
->switch_stmt
)) == BOOLEAN_TYPE
);
3551 if (!processing_template_decl
)
3552 c_do_switch_warnings (cs
->cases
, switch_location
,
3553 SWITCH_STMT_TYPE (cs
->switch_stmt
),
3554 SWITCH_STMT_COND (cs
->switch_stmt
),
3555 bool_cond_p
, cs
->outside_range_p
);
3557 /* For the benefit of block_may_fallthru remember if the switch body
3558 case labels cover all possible values and if there are break; stmts. */
3559 if (cs
->has_default_p
3560 || (!processing_template_decl
3561 && c_switch_covers_all_cases_p (cs
->cases
,
3562 SWITCH_STMT_TYPE (cs
->switch_stmt
))))
3563 SWITCH_STMT_ALL_CASES_P (cs
->switch_stmt
) = 1;
3564 if (!cs
->break_stmt_seen_p
)
3565 SWITCH_STMT_NO_BREAK_P (cs
->switch_stmt
) = 1;
3566 gcc_assert (!cs
->in_loop_body_p
);
3567 splay_tree_delete (cs
->cases
);
3568 switch_stack
= switch_stack
->next
;
3572 /* Note that a BREAK_STMT is about to be added. If it is inside of
3573 a SWITCH_STMT and not inside of a loop body inside of it, note
3574 in switch_stack we've seen a BREAK_STMT. */
3577 note_break_stmt (void)
3579 if (switch_stack
&& !switch_stack
->in_loop_body_p
)
3580 switch_stack
->break_stmt_seen_p
= true;
3583 /* Note the start of processing of an iteration statement's body.
3584 The note_break_stmt function will do nothing while processing it.
3585 Return a flag that should be passed to note_iteration_stmt_body_end. */
3588 note_iteration_stmt_body_start (void)
3592 bool ret
= switch_stack
->in_loop_body_p
;
3593 switch_stack
->in_loop_body_p
= true;
3597 /* Note the end of processing of an iteration statement's body. */
3600 note_iteration_stmt_body_end (bool prev
)
3603 switch_stack
->in_loop_body_p
= prev
;
3606 /* Convert a case constant VALUE in a switch to the type TYPE of the switch
3607 condition. Note that if TYPE and VALUE are already integral we don't
3608 really do the conversion because the language-independent
3609 warning/optimization code will work better that way. */
3612 case_conversion (tree type
, tree value
)
3614 if (value
== NULL_TREE
)
3617 value
= mark_rvalue_use (value
);
3619 if (cxx_dialect
>= cxx11
3620 && (SCOPED_ENUM_P (type
)
3621 || !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (value
))))
3623 if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type
))
3624 type
= type_promotes_to (type
);
3625 value
= (perform_implicit_conversion_flags
3626 (type
, value
, tf_warning_or_error
,
3627 LOOKUP_IMPLICIT
| LOOKUP_NO_NON_INTEGRAL
));
3629 return cxx_constant_value (value
);
3632 /* Note that we've seen a definition of a case label, and complain if this
3633 is a bad place for one. */
3636 finish_case_label (location_t loc
, tree low_value
, tree high_value
)
3639 cp_binding_level
*p
;
3642 if (low_value
== NULL_TREE
&& high_value
== NULL_TREE
)
3643 switch_stack
->has_default_p
= true;
3645 if (processing_template_decl
)
3649 /* For templates, just add the case label; we'll do semantic
3650 analysis at instantiation-time. */
3651 label
= build_decl (loc
, LABEL_DECL
, NULL_TREE
, NULL_TREE
);
3652 return add_stmt (build_case_label (low_value
, high_value
, label
));
3655 /* Find the condition on which this switch statement depends. */
3656 cond
= SWITCH_STMT_COND (switch_stack
->switch_stmt
);
3657 if (cond
&& TREE_CODE (cond
) == TREE_LIST
)
3658 cond
= TREE_VALUE (cond
);
3660 if (!check_switch_goto (switch_stack
->level
))
3661 return error_mark_node
;
3663 type
= SWITCH_STMT_TYPE (switch_stack
->switch_stmt
);
3665 low_value
= case_conversion (type
, low_value
);
3666 high_value
= case_conversion (type
, high_value
);
3668 r
= c_add_case_label (loc
, switch_stack
->cases
, cond
, type
,
3669 low_value
, high_value
,
3670 &switch_stack
->outside_range_p
);
3672 /* After labels, make any new cleanups in the function go into their
3673 own new (temporary) binding contour. */
3674 for (p
= current_binding_level
;
3675 p
->kind
!= sk_function_parms
;
3677 p
->more_cleanups_ok
= 0;
3682 struct typename_info
{
3690 struct typename_hasher
: ggc_ptr_hash
<tree_node
>
3692 typedef typename_info
*compare_type
;
3694 /* Hash a TYPENAME_TYPE. */
3701 hash
= (htab_hash_pointer (TYPE_CONTEXT (t
))
3702 ^ htab_hash_pointer (TYPE_IDENTIFIER (t
)));
3707 /* Compare two TYPENAME_TYPEs. */
3710 equal (tree t1
, const typename_info
*t2
)
3712 return (TYPE_IDENTIFIER (t1
) == t2
->name
3713 && TYPE_CONTEXT (t1
) == t2
->scope
3714 && TYPENAME_TYPE_FULLNAME (t1
) == t2
->template_id
3715 && TYPENAME_IS_ENUM_P (t1
) == t2
->enum_p
3716 && TYPENAME_IS_CLASS_P (t1
) == t2
->class_p
);
3720 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
3721 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
3723 Returns the new TYPENAME_TYPE. */
3725 static GTY (()) hash_table
<typename_hasher
> *typename_htab
;
3728 build_typename_type (tree context
, tree name
, tree fullname
,
3729 enum tag_types tag_type
)
3737 if (typename_htab
== NULL
)
3738 typename_htab
= hash_table
<typename_hasher
>::create_ggc (61);
3740 ti
.scope
= FROB_CONTEXT (context
);
3742 ti
.template_id
= fullname
;
3743 ti
.enum_p
= tag_type
== enum_type
;
3744 ti
.class_p
= (tag_type
== class_type
3745 || tag_type
== record_type
3746 || tag_type
== union_type
);
3747 hash
= (htab_hash_pointer (ti
.scope
)
3748 ^ htab_hash_pointer (ti
.name
));
3750 /* See if we already have this type. */
3751 e
= typename_htab
->find_slot_with_hash (&ti
, hash
, INSERT
);
3756 /* Build the TYPENAME_TYPE. */
3757 t
= cxx_make_type (TYPENAME_TYPE
);
3758 TYPE_CONTEXT (t
) = ti
.scope
;
3759 TYPENAME_TYPE_FULLNAME (t
) = ti
.template_id
;
3760 TYPENAME_IS_ENUM_P (t
) = ti
.enum_p
;
3761 TYPENAME_IS_CLASS_P (t
) = ti
.class_p
;
3763 /* Build the corresponding TYPE_DECL. */
3764 d
= build_decl (input_location
, TYPE_DECL
, name
, t
);
3765 TYPE_NAME (TREE_TYPE (d
)) = d
;
3766 TYPE_STUB_DECL (TREE_TYPE (d
)) = d
;
3767 DECL_CONTEXT (d
) = FROB_CONTEXT (context
);
3768 DECL_ARTIFICIAL (d
) = 1;
3770 /* Store it in the hash table. */
3773 /* TYPENAME_TYPEs must always be compared structurally, because
3774 they may or may not resolve down to another type depending on
3775 the currently open classes. */
3776 SET_TYPE_STRUCTURAL_EQUALITY (t
);
3782 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
3783 provided to name the type. Returns an appropriate type, unless an
3784 error occurs, in which case error_mark_node is returned. If we
3785 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
3786 return that, rather than the _TYPE it corresponds to, in other
3787 cases we look through the type decl. If TF_ERROR is set, complain
3788 about errors, otherwise be quiet. */
3791 make_typename_type (tree context
, tree name
, enum tag_types tag_type
,
3792 tsubst_flags_t complain
)
3798 if (name
== error_mark_node
3799 || context
== NULL_TREE
3800 || context
== error_mark_node
)
3801 return error_mark_node
;
3805 if (!(TYPE_LANG_SPECIFIC (name
)
3806 && (CLASSTYPE_IS_TEMPLATE (name
)
3807 || CLASSTYPE_USE_TEMPLATE (name
))))
3808 name
= TYPE_IDENTIFIER (name
);
3810 /* Create a TEMPLATE_ID_EXPR for the type. */
3811 name
= build_nt (TEMPLATE_ID_EXPR
,
3812 CLASSTYPE_TI_TEMPLATE (name
),
3813 CLASSTYPE_TI_ARGS (name
));
3815 else if (TREE_CODE (name
) == TYPE_DECL
)
3816 name
= DECL_NAME (name
);
3820 if (TREE_CODE (name
) == TEMPLATE_ID_EXPR
)
3822 name
= TREE_OPERAND (name
, 0);
3823 if (DECL_TYPE_TEMPLATE_P (name
))
3824 name
= TREE_OPERAND (fullname
, 0) = DECL_NAME (name
);
3825 if (TREE_CODE (name
) != IDENTIFIER_NODE
)
3827 if (complain
& tf_error
)
3828 error ("%qD is not a type", name
);
3829 return error_mark_node
;
3832 if (TREE_CODE (name
) == TEMPLATE_DECL
)
3834 if (complain
& tf_error
)
3835 error ("%qD used without template parameters", name
);
3836 return error_mark_node
;
3838 gcc_assert (identifier_p (name
));
3839 gcc_assert (TYPE_P (context
));
3841 if (!MAYBE_CLASS_TYPE_P (context
))
3843 if (complain
& tf_error
)
3844 error ("%q#T is not a class", context
);
3845 return error_mark_node
;
3848 /* When the CONTEXT is a dependent type, NAME could refer to a
3849 dependent base class of CONTEXT. But look inside it anyway
3850 if CONTEXT is a currently open scope, in case it refers to a
3851 member of the current instantiation or a non-dependent base;
3852 lookup will stop when we hit a dependent base. */
3853 if (!dependent_scope_p (context
))
3854 /* We should only set WANT_TYPE when we're a nested typename type.
3855 Then we can give better diagnostics if we find a non-type. */
3856 t
= lookup_field (context
, name
, 2, /*want_type=*/true);
3860 if ((!t
|| TREE_CODE (t
) == TREE_LIST
) && dependent_type_p (context
))
3861 return build_typename_type (context
, name
, fullname
, tag_type
);
3863 want_template
= TREE_CODE (fullname
) == TEMPLATE_ID_EXPR
;
3867 if (complain
& tf_error
)
3869 if (!COMPLETE_TYPE_P (context
))
3870 cxx_incomplete_type_error (NULL_TREE
, context
);
3872 error (want_template
? G_("no class template named %q#T in %q#T")
3873 : G_("no type named %q#T in %q#T"), name
, context
);
3875 return error_mark_node
;
3878 /* Pull out the template from an injected-class-name (or multiple). */
3880 t
= maybe_get_template_decl_from_type_decl (t
);
3882 if (TREE_CODE (t
) == TREE_LIST
)
3884 if (complain
& tf_error
)
3886 error ("lookup of %qT in %qT is ambiguous", name
, context
);
3887 print_candidates (t
);
3889 return error_mark_node
;
3892 if (want_template
&& !DECL_TYPE_TEMPLATE_P (t
))
3894 if (complain
& tf_error
)
3895 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3897 return error_mark_node
;
3899 if (!want_template
&& TREE_CODE (t
) != TYPE_DECL
)
3901 if (complain
& tf_error
)
3902 error ("%<typename %T::%D%> names %q#T, which is not a type",
3904 return error_mark_node
;
3907 if (!perform_or_defer_access_check (TYPE_BINFO (context
), t
, t
, complain
))
3908 return error_mark_node
;
3910 /* If we are currently parsing a template and if T is a typedef accessed
3911 through CONTEXT then we need to remember and check access of T at
3912 template instantiation time. */
3913 add_typedef_to_current_template_for_access_check (t
, context
, input_location
);
3916 return lookup_template_class (t
, TREE_OPERAND (fullname
, 1),
3918 /*entering_scope=*/0,
3919 complain
| tf_user
);
3921 if (DECL_ARTIFICIAL (t
) || !(complain
& tf_keep_type_decl
))
3924 maybe_record_typedef_use (t
);
3929 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3930 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3931 in which case error_mark_node is returned.
3933 If PARM_LIST is non-NULL, also make sure that the template parameter
3934 list of TEMPLATE_DECL matches.
3936 If COMPLAIN zero, don't complain about any errors that occur. */
3939 make_unbound_class_template (tree context
, tree name
, tree parm_list
,
3940 tsubst_flags_t complain
)
3946 name
= TYPE_IDENTIFIER (name
);
3947 else if (DECL_P (name
))
3948 name
= DECL_NAME (name
);
3949 gcc_assert (identifier_p (name
));
3951 if (!dependent_type_p (context
)
3952 || currently_open_class (context
))
3954 tree tmpl
= NULL_TREE
;
3956 if (MAYBE_CLASS_TYPE_P (context
))
3957 tmpl
= lookup_field (context
, name
, 0, false);
3959 if (tmpl
&& TREE_CODE (tmpl
) == TYPE_DECL
)
3960 tmpl
= maybe_get_template_decl_from_type_decl (tmpl
);
3962 if (!tmpl
|| !DECL_TYPE_TEMPLATE_P (tmpl
))
3964 if (complain
& tf_error
)
3965 error ("no class template named %q#T in %q#T", name
, context
);
3966 return error_mark_node
;
3970 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl
), parm_list
))
3972 if (complain
& tf_error
)
3974 error ("template parameters do not match template %qD", tmpl
);
3975 inform (DECL_SOURCE_LOCATION (tmpl
),
3976 "%qD declared here", tmpl
);
3978 return error_mark_node
;
3981 if (!perform_or_defer_access_check (TYPE_BINFO (context
), tmpl
, tmpl
,
3983 return error_mark_node
;
3988 /* Build the UNBOUND_CLASS_TEMPLATE. */
3989 t
= cxx_make_type (UNBOUND_CLASS_TEMPLATE
);
3990 TYPE_CONTEXT (t
) = FROB_CONTEXT (context
);
3991 TREE_TYPE (t
) = NULL_TREE
;
3992 SET_TYPE_STRUCTURAL_EQUALITY (t
);
3994 /* Build the corresponding TEMPLATE_DECL. */
3995 d
= build_decl (input_location
, TEMPLATE_DECL
, name
, t
);
3996 TYPE_NAME (TREE_TYPE (d
)) = d
;
3997 TYPE_STUB_DECL (TREE_TYPE (d
)) = d
;
3998 DECL_CONTEXT (d
) = FROB_CONTEXT (context
);
3999 DECL_ARTIFICIAL (d
) = 1;
4000 DECL_TEMPLATE_PARMS (d
) = parm_list
;
4007 /* Push the declarations of builtin types into the global namespace.
4008 RID_INDEX is the index of the builtin type in the array
4009 RID_POINTERS. NAME is the name used when looking up the builtin
4010 type. TYPE is the _TYPE node for the builtin type.
4012 The calls to set_global_binding below should be
4013 eliminated. Built-in types should not be looked up name; their
4014 names are keywords that the parser can recognize. However, there
4015 is code in c-common.c that uses identifier_global_value to look up
4016 built-in types by name. */
4019 record_builtin_type (enum rid rid_index
,
4023 tree decl
= NULL_TREE
;
4027 tree tname
= get_identifier (name
);
4028 tree tdecl
= build_decl (BUILTINS_LOCATION
, TYPE_DECL
, tname
, type
);
4029 DECL_ARTIFICIAL (tdecl
) = 1;
4030 set_global_binding (tdecl
);
4034 if ((int) rid_index
< (int) RID_MAX
)
4035 if (tree rname
= ridpointers
[(int) rid_index
])
4036 if (!decl
|| DECL_NAME (decl
) != rname
)
4038 tree rdecl
= build_decl (BUILTINS_LOCATION
, TYPE_DECL
, rname
, type
);
4039 DECL_ARTIFICIAL (rdecl
) = 1;
4040 set_global_binding (rdecl
);
4047 if (!TYPE_NAME (type
))
4048 TYPE_NAME (type
) = decl
;
4049 debug_hooks
->type_decl (decl
, 0);
4053 /* Push a type into the namespace so that the back ends ignore it. */
4056 record_unknown_type (tree type
, const char* name
)
4058 tree decl
= pushdecl (build_decl (UNKNOWN_LOCATION
,
4059 TYPE_DECL
, get_identifier (name
), type
));
4060 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
4061 DECL_IGNORED_P (decl
) = 1;
4062 TYPE_DECL_SUPPRESS_DEBUG (decl
) = 1;
4063 TYPE_SIZE (type
) = TYPE_SIZE (void_type_node
);
4064 SET_TYPE_ALIGN (type
, 1);
4065 TYPE_USER_ALIGN (type
) = 0;
4066 SET_TYPE_MODE (type
, TYPE_MODE (void_type_node
));
4069 /* Create all the predefined identifiers. */
4072 initialize_predefined_identifiers (void)
4074 struct predefined_identifier
4076 const char *name
; /* Name. */
4077 tree
*node
; /* Node to store it in. */
4078 cp_identifier_kind kind
; /* Kind of identifier. */
4081 /* A table of identifiers to create at startup. */
4082 static const predefined_identifier predefined_identifiers
[] = {
4083 {"C++", &lang_name_cplusplus
, cik_normal
},
4084 {"C", &lang_name_c
, cik_normal
},
4085 /* Some of these names have a trailing space so that it is
4086 impossible for them to conflict with names written by users. */
4087 {"__ct ", &ctor_identifier
, cik_ctor
},
4088 {"__ct_base ", &base_ctor_identifier
, cik_ctor
},
4089 {"__ct_comp ", &complete_ctor_identifier
, cik_ctor
},
4090 {"__dt ", &dtor_identifier
, cik_dtor
},
4091 {"__dt_base ", &base_dtor_identifier
, cik_dtor
},
4092 {"__dt_comp ", &complete_dtor_identifier
, cik_dtor
},
4093 {"__dt_del ", &deleting_dtor_identifier
, cik_dtor
},
4094 {"__conv_op ", &conv_op_identifier
, cik_conv_op
},
4095 {"__in_chrg", &in_charge_identifier
, cik_normal
},
4096 {"this", &this_identifier
, cik_normal
},
4097 {"__delta", &delta_identifier
, cik_normal
},
4098 {"__pfn", &pfn_identifier
, cik_normal
},
4099 {"_vptr", &vptr_identifier
, cik_normal
},
4100 {"__vtt_parm", &vtt_parm_identifier
, cik_normal
},
4101 {"::", &global_identifier
, cik_normal
},
4102 {"std", &std_identifier
, cik_normal
},
4103 /* The demangler expects anonymous namespaces to be called
4104 something starting with '_GLOBAL__N_'. It no longer needs
4105 to be unique to the TU. */
4106 {"_GLOBAL__N_1", &anon_identifier
, cik_normal
},
4107 {"auto", &auto_identifier
, cik_normal
},
4108 {"decltype(auto)", &decltype_auto_identifier
, cik_normal
},
4109 {"initializer_list", &init_list_identifier
, cik_normal
},
4110 {NULL
, NULL
, cik_normal
}
4113 for (const predefined_identifier
*pid
= predefined_identifiers
;
4116 *pid
->node
= get_identifier (pid
->name
);
4117 /* Some of these identifiers already have a special kind. */
4118 if (pid
->kind
!= cik_normal
)
4119 set_identifier_kind (*pid
->node
, pid
->kind
);
4123 /* Create the predefined scalar types of C,
4124 and some nodes representing standard constants (0, 1, (void *)0).
4125 Initialize the global binding level.
4126 Make definitions for built-in primitive functions. */
4129 cxx_init_decl_processing (void)
4132 tree void_ftype_ptr
;
4134 /* Create all the identifiers we need. */
4135 initialize_predefined_identifiers ();
4137 /* Create the global variables. */
4138 push_to_top_level ();
4140 current_function_decl
= NULL_TREE
;
4141 current_binding_level
= NULL
;
4142 /* Enter the global namespace. */
4143 gcc_assert (global_namespace
== NULL_TREE
);
4144 global_namespace
= build_lang_decl (NAMESPACE_DECL
, global_identifier
,
4146 TREE_PUBLIC (global_namespace
) = 1;
4147 DECL_CONTEXT (global_namespace
)
4148 = build_translation_unit_decl (get_identifier (main_input_filename
));
4149 /* Remember whether we want the empty class passing ABI change warning
4151 TRANSLATION_UNIT_WARN_EMPTY_P (DECL_CONTEXT (global_namespace
))
4152 = warn_abi
&& abi_version_crosses (12);
4153 debug_hooks
->register_main_translation_unit
4154 (DECL_CONTEXT (global_namespace
));
4155 begin_scope (sk_namespace
, global_namespace
);
4156 current_namespace
= global_namespace
;
4158 if (flag_visibility_ms_compat
)
4159 default_visibility
= VISIBILITY_HIDDEN
;
4162 current_lang_name
= lang_name_c
;
4164 /* Create the `std' namespace. */
4165 push_namespace (std_identifier
);
4166 std_node
= current_namespace
;
4169 flag_noexcept_type
= (cxx_dialect
>= cxx17
);
4170 /* There's no fixed location for <command-line>, the current
4171 location is <builtins>, which is somewhat confusing. */
4172 if (!flag_new_for_scope
)
4173 warning_at (UNKNOWN_LOCATION
, OPT_Wdeprecated
,
4174 "%<-fno-for-scope%> is deprecated");
4175 if (flag_friend_injection
)
4176 warning_at (UNKNOWN_LOCATION
, OPT_Wdeprecated
,
4177 "%<-ffriend-injection%> is deprecated");
4179 c_common_nodes_and_builtins ();
4181 integer_two_node
= build_int_cst (NULL_TREE
, 2);
4183 /* Guess at the initial static decls size. */
4184 vec_alloc (static_decls
, 500);
4186 /* ... and keyed classes. */
4187 vec_alloc (keyed_classes
, 100);
4189 record_builtin_type (RID_BOOL
, "bool", boolean_type_node
);
4190 truthvalue_type_node
= boolean_type_node
;
4191 truthvalue_false_node
= boolean_false_node
;
4192 truthvalue_true_node
= boolean_true_node
;
4194 empty_except_spec
= build_tree_list (NULL_TREE
, NULL_TREE
);
4195 noexcept_true_spec
= build_tree_list (boolean_true_node
, NULL_TREE
);
4196 noexcept_false_spec
= build_tree_list (boolean_false_node
, NULL_TREE
);
4197 noexcept_deferred_spec
= build_tree_list (make_node (DEFERRED_NOEXCEPT
),
4201 record_builtin_type (RID_MAX
, NULL
, string_type_node
);
4204 delta_type_node
= ptrdiff_type_node
;
4205 vtable_index_type
= ptrdiff_type_node
;
4207 vtt_parm_type
= build_pointer_type (const_ptr_type_node
);
4208 void_ftype
= build_function_type_list (void_type_node
, NULL_TREE
);
4209 void_ftype_ptr
= build_function_type_list (void_type_node
,
4210 ptr_type_node
, NULL_TREE
);
4212 = build_exception_variant (void_ftype_ptr
, empty_except_spec
);
4214 /* Create the conversion operator marker. This operator's DECL_NAME
4215 is in the identifier table, so we can use identifier equality to
4217 conv_op_marker
= build_lang_decl (FUNCTION_DECL
, conv_op_identifier
,
4220 /* C++ extensions */
4222 unknown_type_node
= make_node (LANG_TYPE
);
4223 record_unknown_type (unknown_type_node
, "unknown type");
4225 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
4226 TREE_TYPE (unknown_type_node
) = unknown_type_node
;
4228 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
4230 TYPE_POINTER_TO (unknown_type_node
) = unknown_type_node
;
4231 TYPE_REFERENCE_TO (unknown_type_node
) = unknown_type_node
;
4233 init_list_type_node
= make_node (LANG_TYPE
);
4234 record_unknown_type (init_list_type_node
, "init list");
4237 /* Make sure we get a unique function type, so we can give
4238 its pointer type a name. (This wins for gdb.) */
4239 tree vfunc_type
= make_node (FUNCTION_TYPE
);
4240 TREE_TYPE (vfunc_type
) = integer_type_node
;
4241 TYPE_ARG_TYPES (vfunc_type
) = NULL_TREE
;
4242 layout_type (vfunc_type
);
4244 vtable_entry_type
= build_pointer_type (vfunc_type
);
4246 record_builtin_type (RID_MAX
, "__vtbl_ptr_type", vtable_entry_type
);
4249 = build_cplus_array_type (vtable_entry_type
, NULL_TREE
);
4250 layout_type (vtbl_type_node
);
4251 vtbl_type_node
= cp_build_qualified_type (vtbl_type_node
, TYPE_QUAL_CONST
);
4252 record_builtin_type (RID_MAX
, NULL
, vtbl_type_node
);
4253 vtbl_ptr_type_node
= build_pointer_type (vtable_entry_type
);
4254 layout_type (vtbl_ptr_type_node
);
4255 record_builtin_type (RID_MAX
, NULL
, vtbl_ptr_type_node
);
4257 push_namespace (get_identifier ("__cxxabiv1"));
4258 abi_node
= current_namespace
;
4261 global_type_node
= make_node (LANG_TYPE
);
4262 record_unknown_type (global_type_node
, "global type");
4264 any_targ_node
= make_node (LANG_TYPE
);
4265 record_unknown_type (any_targ_node
, "any type");
4268 current_lang_name
= lang_name_cplusplus
;
4270 if (aligned_new_threshold
> 1
4271 && !pow2p_hwi (aligned_new_threshold
))
4273 error ("-faligned-new=%d is not a power of two", aligned_new_threshold
);
4274 aligned_new_threshold
= 1;
4276 if (aligned_new_threshold
== -1)
4277 aligned_new_threshold
= (cxx_dialect
>= cxx17
) ? 1 : 0;
4278 if (aligned_new_threshold
== 1)
4279 aligned_new_threshold
= malloc_alignment () / BITS_PER_UNIT
;
4282 tree newattrs
, extvisattr
;
4283 tree newtype
, deltype
;
4284 tree ptr_ftype_sizetype
;
4288 = build_function_type_list (ptr_type_node
, size_type_node
, NULL_TREE
);
4289 if (cxx_dialect
== cxx98
)
4292 tree bad_alloc_type_node
;
4293 tree bad_alloc_decl
;
4295 push_namespace (std_identifier
);
4296 bad_alloc_id
= get_identifier ("bad_alloc");
4297 bad_alloc_type_node
= make_class_type (RECORD_TYPE
);
4298 TYPE_CONTEXT (bad_alloc_type_node
) = current_namespace
;
4300 = create_implicit_typedef (bad_alloc_id
, bad_alloc_type_node
);
4301 DECL_CONTEXT (bad_alloc_decl
) = current_namespace
;
4305 = add_exception_specifier (NULL_TREE
, bad_alloc_type_node
, -1);
4308 new_eh_spec
= noexcept_false_spec
;
4310 /* Ensure attribs.c is initialized. */
4313 /* Ensure constraint.cc is initialized. */
4314 init_constraint_processing ();
4316 extvisattr
= build_tree_list (get_identifier ("externally_visible"),
4318 newattrs
= tree_cons (get_identifier ("alloc_size"),
4319 build_tree_list (NULL_TREE
, integer_one_node
),
4321 newtype
= cp_build_type_attribute_variant (ptr_ftype_sizetype
, newattrs
);
4322 newtype
= build_exception_variant (newtype
, new_eh_spec
);
4323 deltype
= cp_build_type_attribute_variant (void_ftype_ptr
, extvisattr
);
4324 deltype
= build_exception_variant (deltype
, empty_except_spec
);
4325 tree opnew
= push_cp_library_fn (NEW_EXPR
, newtype
, 0);
4326 DECL_IS_MALLOC (opnew
) = 1;
4327 DECL_IS_OPERATOR_NEW (opnew
) = 1;
4328 opnew
= push_cp_library_fn (VEC_NEW_EXPR
, newtype
, 0);
4329 DECL_IS_MALLOC (opnew
) = 1;
4330 DECL_IS_OPERATOR_NEW (opnew
) = 1;
4331 push_cp_library_fn (DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4332 push_cp_library_fn (VEC_DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4333 if (flag_sized_deallocation
)
4335 /* Also push the sized deallocation variants:
4336 void operator delete(void*, std::size_t) throw();
4337 void operator delete[](void*, std::size_t) throw(); */
4338 tree void_ftype_ptr_size
4339 = build_function_type_list (void_type_node
, ptr_type_node
,
4340 size_type_node
, NULL_TREE
);
4341 deltype
= cp_build_type_attribute_variant (void_ftype_ptr_size
,
4343 deltype
= build_exception_variant (deltype
, empty_except_spec
);
4344 push_cp_library_fn (DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4345 push_cp_library_fn (VEC_DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4348 if (aligned_new_threshold
)
4350 push_namespace (std_identifier
);
4351 tree align_id
= get_identifier ("align_val_t");
4352 align_type_node
= start_enum (align_id
, NULL_TREE
, size_type_node
,
4353 NULL_TREE
, /*scoped*/true, NULL
);
4356 /* operator new (size_t, align_val_t); */
4357 newtype
= build_function_type_list (ptr_type_node
, size_type_node
,
4358 align_type_node
, NULL_TREE
);
4359 newtype
= cp_build_type_attribute_variant (newtype
, newattrs
);
4360 newtype
= build_exception_variant (newtype
, new_eh_spec
);
4361 opnew
= push_cp_library_fn (NEW_EXPR
, newtype
, 0);
4362 DECL_IS_MALLOC (opnew
) = 1;
4363 DECL_IS_OPERATOR_NEW (opnew
) = 1;
4364 opnew
= push_cp_library_fn (VEC_NEW_EXPR
, newtype
, 0);
4365 DECL_IS_MALLOC (opnew
) = 1;
4366 DECL_IS_OPERATOR_NEW (opnew
) = 1;
4368 /* operator delete (void *, align_val_t); */
4369 deltype
= build_function_type_list (void_type_node
, ptr_type_node
,
4370 align_type_node
, NULL_TREE
);
4371 deltype
= cp_build_type_attribute_variant (deltype
, extvisattr
);
4372 deltype
= build_exception_variant (deltype
, empty_except_spec
);
4373 push_cp_library_fn (DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4374 push_cp_library_fn (VEC_DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4376 if (flag_sized_deallocation
)
4378 /* operator delete (void *, size_t, align_val_t); */
4379 deltype
= build_function_type_list (void_type_node
, ptr_type_node
,
4380 size_type_node
, align_type_node
,
4382 deltype
= cp_build_type_attribute_variant (deltype
, extvisattr
);
4383 deltype
= build_exception_variant (deltype
, empty_except_spec
);
4384 push_cp_library_fn (DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4385 push_cp_library_fn (VEC_DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4389 nullptr_type_node
= make_node (NULLPTR_TYPE
);
4390 TYPE_SIZE (nullptr_type_node
) = bitsize_int (GET_MODE_BITSIZE (ptr_mode
));
4391 TYPE_SIZE_UNIT (nullptr_type_node
) = size_int (GET_MODE_SIZE (ptr_mode
));
4392 TYPE_UNSIGNED (nullptr_type_node
) = 1;
4393 TYPE_PRECISION (nullptr_type_node
) = GET_MODE_BITSIZE (ptr_mode
);
4394 if (abi_version_at_least (9))
4395 SET_TYPE_ALIGN (nullptr_type_node
, GET_MODE_ALIGNMENT (ptr_mode
));
4396 SET_TYPE_MODE (nullptr_type_node
, ptr_mode
);
4397 record_builtin_type (RID_MAX
, "decltype(nullptr)", nullptr_type_node
);
4398 nullptr_node
= build_int_cst (nullptr_type_node
, 0);
4402 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype
,
4403 ECF_NORETURN
| ECF_NOTHROW
| ECF_COLD
);
4405 /* Perform other language dependent initializations. */
4406 init_class_processing ();
4407 init_rtti_processing ();
4408 init_template_processing ();
4410 if (flag_exceptions
)
4411 init_exception_processing ();
4413 if (! supports_one_only ())
4416 make_fname_decl
= cp_make_fname_decl
;
4417 start_fname_decls ();
4419 /* Show we use EH for cleanups. */
4420 if (flag_exceptions
)
4421 using_eh_for_cleanups ();
4424 /* Generate an initializer for a function naming variable from
4425 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
4426 filled in with the type of the init. */
4429 cp_fname_init (const char* name
, tree
*type_p
)
4431 tree domain
= NULL_TREE
;
4433 tree init
= NULL_TREE
;
4438 length
= strlen (name
);
4439 domain
= build_index_type (size_int (length
));
4440 init
= build_string (length
+ 1, name
);
4443 type
= cp_build_qualified_type (char_type_node
, TYPE_QUAL_CONST
);
4444 type
= build_cplus_array_type (type
, domain
);
4449 TREE_TYPE (init
) = type
;
4451 init
= error_mark_node
;
4456 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
4457 the decl, LOC is the location to give the decl, NAME is the
4458 initialization string and TYPE_DEP indicates whether NAME depended
4459 on the type of the function. We make use of that to detect
4460 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
4461 at the point of first use, so we mustn't push the decl now. */
4464 cp_make_fname_decl (location_t loc
, tree id
, int type_dep
)
4466 const char *const name
= (type_dep
&& processing_template_decl
4467 ? NULL
: fname_as_string (type_dep
));
4469 tree init
= cp_fname_init (name
, &type
);
4470 tree decl
= build_decl (loc
, VAR_DECL
, id
, type
);
4473 free (CONST_CAST (char *, name
));
4475 TREE_STATIC (decl
) = 1;
4476 TREE_READONLY (decl
) = 1;
4477 DECL_ARTIFICIAL (decl
) = 1;
4479 TREE_USED (decl
) = 1;
4481 if (current_function_decl
)
4483 DECL_CONTEXT (decl
) = current_function_decl
;
4484 decl
= pushdecl_outermost_localscope (decl
);
4485 cp_finish_decl (decl
, init
, /*init_const_expr_p=*/false, NULL_TREE
,
4486 LOOKUP_ONLYCONVERTING
);
4490 DECL_THIS_STATIC (decl
) = true;
4491 pushdecl_top_level_and_finish (decl
, init
);
4498 builtin_function_1 (tree decl
, tree context
, bool is_global
)
4500 tree id
= DECL_NAME (decl
);
4501 const char *name
= IDENTIFIER_POINTER (id
);
4503 retrofit_lang_decl (decl
);
4505 DECL_ARTIFICIAL (decl
) = 1;
4506 SET_DECL_LANGUAGE (decl
, lang_c
);
4507 /* Runtime library routines are, by definition, available in an
4508 external shared object. */
4509 DECL_VISIBILITY (decl
) = VISIBILITY_DEFAULT
;
4510 DECL_VISIBILITY_SPECIFIED (decl
) = 1;
4512 DECL_CONTEXT (decl
) = context
;
4514 /* A function in the user's namespace should have an explicit
4515 declaration before it is used. Mark the built-in function as
4516 anticipated but not actually declared. */
4517 if (name
[0] != '_' || name
[1] != '_')
4518 DECL_ANTICIPATED (decl
) = 1;
4519 else if (strncmp (name
+ 2, "builtin_", strlen ("builtin_")) != 0)
4521 size_t len
= strlen (name
);
4523 /* Treat __*_chk fortification functions as anticipated as well,
4524 unless they are __builtin_*. */
4525 if (len
> strlen ("___chk")
4526 && memcmp (name
+ len
- strlen ("_chk"),
4527 "_chk", strlen ("_chk") + 1) == 0)
4528 DECL_ANTICIPATED (decl
) = 1;
4532 pushdecl_top_level (decl
);
4540 cxx_builtin_function (tree decl
)
4542 tree id
= DECL_NAME (decl
);
4543 const char *name
= IDENTIFIER_POINTER (id
);
4544 /* All builtins that don't begin with an '_' should additionally
4545 go in the 'std' namespace. */
4548 tree decl2
= copy_node(decl
);
4549 push_namespace (std_identifier
);
4550 builtin_function_1 (decl2
, std_node
, false);
4554 return builtin_function_1 (decl
, NULL_TREE
, false);
4557 /* Like cxx_builtin_function, but guarantee the function is added to the global
4558 scope. This is to allow function specific options to add new machine
4559 dependent builtins when the target ISA changes via attribute((target(...)))
4560 which saves space on program startup if the program does not use non-generic
4564 cxx_builtin_function_ext_scope (tree decl
)
4567 tree id
= DECL_NAME (decl
);
4568 const char *name
= IDENTIFIER_POINTER (id
);
4569 /* All builtins that don't begin with an '_' should additionally
4570 go in the 'std' namespace. */
4573 tree decl2
= copy_node(decl
);
4574 push_namespace (std_identifier
);
4575 builtin_function_1 (decl2
, std_node
, true);
4579 return builtin_function_1 (decl
, NULL_TREE
, true);
4582 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
4583 function. Not called directly. */
4586 build_library_fn (tree name
, enum tree_code operator_code
, tree type
,
4589 tree fn
= build_lang_decl (FUNCTION_DECL
, name
, type
);
4590 DECL_EXTERNAL (fn
) = 1;
4591 TREE_PUBLIC (fn
) = 1;
4592 DECL_ARTIFICIAL (fn
) = 1;
4593 DECL_OVERLOADED_OPERATOR_CODE_RAW (fn
)
4594 = OVL_OP_INFO (false, operator_code
)->ovl_op_code
;
4595 SET_DECL_LANGUAGE (fn
, lang_c
);
4596 /* Runtime library routines are, by definition, available in an
4597 external shared object. */
4598 DECL_VISIBILITY (fn
) = VISIBILITY_DEFAULT
;
4599 DECL_VISIBILITY_SPECIFIED (fn
) = 1;
4600 set_call_expr_flags (fn
, ecf_flags
);
4604 /* Returns the _DECL for a library function with C++ linkage. */
4607 build_cp_library_fn (tree name
, enum tree_code operator_code
, tree type
,
4610 tree fn
= build_library_fn (name
, operator_code
, type
, ecf_flags
);
4611 DECL_CONTEXT (fn
) = FROB_CONTEXT (current_namespace
);
4612 SET_DECL_LANGUAGE (fn
, lang_cplusplus
);
4616 /* Like build_library_fn, but takes a C string instead of an
4620 build_library_fn_ptr (const char* name
, tree type
, int ecf_flags
)
4622 return build_library_fn (get_identifier (name
), ERROR_MARK
, type
, ecf_flags
);
4625 /* Like build_cp_library_fn, but takes a C string instead of an
4629 build_cp_library_fn_ptr (const char* name
, tree type
, int ecf_flags
)
4631 return build_cp_library_fn (get_identifier (name
), ERROR_MARK
, type
,
4635 /* Like build_library_fn, but also pushes the function so that we will
4636 be able to find it via get_global_binding. Also, the function
4637 may throw exceptions listed in RAISES. */
4640 push_library_fn (tree name
, tree type
, tree raises
, int ecf_flags
)
4645 type
= build_exception_variant (type
, raises
);
4647 fn
= build_library_fn (name
, ERROR_MARK
, type
, ecf_flags
);
4648 pushdecl_top_level (fn
);
4652 /* Like build_cp_library_fn, but also pushes the function so that it
4653 will be found by normal lookup. */
4656 push_cp_library_fn (enum tree_code operator_code
, tree type
,
4659 tree fn
= build_cp_library_fn (ovl_op_identifier (false, operator_code
),
4660 operator_code
, type
, ecf_flags
);
4663 apply_tm_attr (fn
, get_identifier ("transaction_safe"));
4667 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
4671 push_void_library_fn (tree name
, tree parmtypes
, int ecf_flags
)
4673 tree type
= build_function_type (void_type_node
, parmtypes
);
4674 return push_library_fn (name
, type
, NULL_TREE
, ecf_flags
);
4677 /* Like push_library_fn, but also note that this function throws
4678 and does not return. Used for __throw_foo and the like. */
4681 push_throw_library_fn (tree name
, tree type
)
4683 tree fn
= push_library_fn (name
, type
, NULL_TREE
, ECF_NORETURN
| ECF_COLD
);
4687 /* When we call finish_struct for an anonymous union, we create
4688 default copy constructors and such. But, an anonymous union
4689 shouldn't have such things; this function undoes the damage to the
4690 anonymous union type T.
4692 (The reason that we create the synthesized methods is that we don't
4693 distinguish `union { int i; }' from `typedef union { int i; } U'.
4694 The first is an anonymous union; the second is just an ordinary
4698 fixup_anonymous_aggr (tree t
)
4700 /* Wipe out memory of synthesized methods. */
4701 TYPE_HAS_USER_CONSTRUCTOR (t
) = 0;
4702 TYPE_HAS_DEFAULT_CONSTRUCTOR (t
) = 0;
4703 TYPE_HAS_COPY_CTOR (t
) = 0;
4704 TYPE_HAS_CONST_COPY_CTOR (t
) = 0;
4705 TYPE_HAS_COPY_ASSIGN (t
) = 0;
4706 TYPE_HAS_CONST_COPY_ASSIGN (t
) = 0;
4708 /* Splice the implicitly generated functions out of TYPE_FIELDS. */
4709 for (tree probe
, *prev_p
= &TYPE_FIELDS (t
); (probe
= *prev_p
);)
4710 if (TREE_CODE (probe
) == FUNCTION_DECL
&& DECL_ARTIFICIAL (probe
))
4711 *prev_p
= DECL_CHAIN (probe
);
4713 prev_p
= &DECL_CHAIN (probe
);
4715 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
4716 assignment operators (because they cannot have these methods themselves).
4717 For anonymous unions this is already checked because they are not allowed
4718 in any union, otherwise we have to check it. */
4719 if (TREE_CODE (t
) != UNION_TYPE
)
4723 for (field
= TYPE_FIELDS (t
); field
; field
= DECL_CHAIN (field
))
4724 if (TREE_CODE (field
) == FIELD_DECL
)
4726 type
= TREE_TYPE (field
);
4727 if (CLASS_TYPE_P (type
))
4729 if (TYPE_NEEDS_CONSTRUCTING (type
))
4730 error ("member %q+#D with constructor not allowed "
4731 "in anonymous aggregate", field
);
4732 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
))
4733 error ("member %q+#D with destructor not allowed "
4734 "in anonymous aggregate", field
);
4735 if (TYPE_HAS_COMPLEX_COPY_ASSIGN (type
))
4736 error ("member %q+#D with copy assignment operator "
4737 "not allowed in anonymous aggregate", field
);
4743 /* Warn for an attribute located at LOCATION that appertains to the
4744 class type CLASS_TYPE that has not been properly placed after its
4745 class-key, in it class-specifier. */
4748 warn_misplaced_attr_for_class_type (source_location location
,
4751 gcc_assert (OVERLOAD_TYPE_P (class_type
));
4753 if (warning_at (location
, OPT_Wattributes
,
4754 "attribute ignored in declaration "
4755 "of %q#T", class_type
))
4757 "attribute for %q#T must follow the %qs keyword",
4758 class_type
, class_key_or_enum_as_string (class_type
));
4761 /* Make sure that a declaration with no declarator is well-formed, i.e.
4762 just declares a tagged type or anonymous union.
4764 Returns the type declared; or NULL_TREE if none. */
4767 check_tag_decl (cp_decl_specifier_seq
*declspecs
,
4768 bool explicit_type_instantiation_p
)
4770 int saw_friend
= decl_spec_seq_has_spec_p (declspecs
, ds_friend
);
4771 int saw_typedef
= decl_spec_seq_has_spec_p (declspecs
, ds_typedef
);
4772 /* If a class, struct, or enum type is declared by the DECLSPECS
4773 (i.e, if a class-specifier, enum-specifier, or non-typename
4774 elaborated-type-specifier appears in the DECLSPECS),
4775 DECLARED_TYPE is set to the corresponding type. */
4776 tree declared_type
= NULL_TREE
;
4777 bool error_p
= false;
4779 if (declspecs
->multiple_types_p
)
4780 error ("multiple types in one declaration");
4781 else if (declspecs
->redefined_builtin_type
)
4783 if (!in_system_header_at (input_location
))
4784 permerror (declspecs
->locations
[ds_redefined_builtin_type_spec
],
4785 "redeclaration of C++ built-in type %qT",
4786 declspecs
->redefined_builtin_type
);
4791 && TYPE_P (declspecs
->type
)
4792 && ((TREE_CODE (declspecs
->type
) != TYPENAME_TYPE
4793 && MAYBE_CLASS_TYPE_P (declspecs
->type
))
4794 || TREE_CODE (declspecs
->type
) == ENUMERAL_TYPE
))
4795 declared_type
= declspecs
->type
;
4796 else if (declspecs
->type
== error_mark_node
)
4798 if (declared_type
== NULL_TREE
&& ! saw_friend
&& !error_p
)
4799 permerror (input_location
, "declaration does not declare anything");
4800 else if (declared_type
!= NULL_TREE
&& type_uses_auto (declared_type
))
4802 error_at (declspecs
->locations
[ds_type_spec
],
4803 "%<auto%> can only be specified for variables "
4804 "or function declarations");
4805 return error_mark_node
;
4807 /* Check for an anonymous union. */
4808 else if (declared_type
&& RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type
))
4809 && TYPE_UNNAMED_P (declared_type
))
4811 /* 7/3 In a simple-declaration, the optional init-declarator-list
4812 can be omitted only when declaring a class (clause 9) or
4813 enumeration (7.2), that is, when the decl-specifier-seq contains
4814 either a class-specifier, an elaborated-type-specifier with
4815 a class-key (9.1), or an enum-specifier. In these cases and
4816 whenever a class-specifier or enum-specifier is present in the
4817 decl-specifier-seq, the identifiers in these specifiers are among
4818 the names being declared by the declaration (as class-name,
4819 enum-names, or enumerators, depending on the syntax). In such
4820 cases, and except for the declaration of an unnamed bit-field (9.6),
4821 the decl-specifier-seq shall introduce one or more names into the
4822 program, or shall redeclare a name introduced by a previous
4823 declaration. [Example:
4824 enum { }; // ill-formed
4825 typedef class { }; // ill-formed
4829 error ("missing type-name in typedef-declaration");
4832 /* Anonymous unions are objects, so they can have specifiers. */;
4833 SET_ANON_AGGR_TYPE_P (declared_type
);
4835 if (TREE_CODE (declared_type
) != UNION_TYPE
4836 && !in_system_header_at (input_location
))
4837 pedwarn (input_location
, OPT_Wpedantic
, "ISO C++ prohibits anonymous structs");
4842 if (decl_spec_seq_has_spec_p (declspecs
, ds_inline
))
4843 error_at (declspecs
->locations
[ds_inline
],
4844 "%<inline%> can only be specified for functions");
4845 else if (decl_spec_seq_has_spec_p (declspecs
, ds_virtual
))
4846 error_at (declspecs
->locations
[ds_virtual
],
4847 "%<virtual%> can only be specified for functions");
4849 && (!current_class_type
4850 || current_scope () != current_class_type
))
4851 error_at (declspecs
->locations
[ds_friend
],
4852 "%<friend%> can only be specified inside a class");
4853 else if (decl_spec_seq_has_spec_p (declspecs
, ds_explicit
))
4854 error_at (declspecs
->locations
[ds_explicit
],
4855 "%<explicit%> can only be specified for constructors");
4856 else if (declspecs
->storage_class
)
4857 error_at (declspecs
->locations
[ds_storage_class
],
4858 "a storage class can only be specified for objects "
4860 else if (decl_spec_seq_has_spec_p (declspecs
, ds_const
))
4861 error_at (declspecs
->locations
[ds_const
],
4862 "%<const%> can only be specified for objects and "
4864 else if (decl_spec_seq_has_spec_p (declspecs
, ds_volatile
))
4865 error_at (declspecs
->locations
[ds_volatile
],
4866 "%<volatile%> can only be specified for objects and "
4868 else if (decl_spec_seq_has_spec_p (declspecs
, ds_restrict
))
4869 error_at (declspecs
->locations
[ds_restrict
],
4870 "%<__restrict%> can only be specified for objects and "
4872 else if (decl_spec_seq_has_spec_p (declspecs
, ds_thread
))
4873 error_at (declspecs
->locations
[ds_thread
],
4874 "%<__thread%> can only be specified for objects "
4876 else if (saw_typedef
)
4877 warning_at (declspecs
->locations
[ds_typedef
], 0,
4878 "%<typedef%> was ignored in this declaration");
4879 else if (decl_spec_seq_has_spec_p (declspecs
, ds_constexpr
))
4880 error_at (declspecs
->locations
[ds_constexpr
],
4881 "%<constexpr%> cannot be used for type declarations");
4884 if (declspecs
->attributes
&& warn_attributes
&& declared_type
)
4887 if (!CLASS_TYPE_P (declared_type
)
4888 || !CLASSTYPE_TEMPLATE_INSTANTIATION (declared_type
))
4889 /* For a non-template class, use the name location. */
4890 loc
= location_of (declared_type
);
4892 /* For a template class (an explicit instantiation), use the
4893 current location. */
4894 loc
= input_location
;
4896 if (explicit_type_instantiation_p
)
4897 /* [dcl.attr.grammar]/4:
4899 No attribute-specifier-seq shall appertain to an explicit
4902 if (warning_at (loc
, OPT_Wattributes
,
4903 "attribute ignored in explicit instantiation %q#T",
4906 "no attribute can be applied to "
4907 "an explicit instantiation");
4910 warn_misplaced_attr_for_class_type (loc
, declared_type
);
4913 return declared_type
;
4916 /* Called when a declaration is seen that contains no names to declare.
4917 If its type is a reference to a structure, union or enum inherited
4918 from a containing scope, shadow that tag name for the current scope
4919 with a forward reference.
4920 If its type defines a new named structure or union
4921 or defines an enum, it is valid but we need not do anything here.
4922 Otherwise, it is an error.
4924 C++: may have to grok the declspecs to learn about static,
4925 complain for anonymous unions.
4927 Returns the TYPE declared -- or NULL_TREE if none. */
4930 shadow_tag (cp_decl_specifier_seq
*declspecs
)
4932 tree t
= check_tag_decl (declspecs
,
4933 /*explicit_type_instantiation_p=*/false);
4938 if (maybe_process_partial_specialization (t
) == error_mark_node
)
4941 /* This is where the variables in an anonymous union are
4942 declared. An anonymous union declaration looks like:
4944 because there is no declarator after the union, the parser
4945 sends that declaration here. */
4946 if (ANON_AGGR_TYPE_P (t
))
4948 fixup_anonymous_aggr (t
);
4950 if (TYPE_FIELDS (t
))
4952 tree decl
= grokdeclarator (/*declarator=*/NULL
,
4953 declspecs
, NORMAL
, 0, NULL
);
4954 finish_anon_union (decl
);
4961 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4964 groktypename (cp_decl_specifier_seq
*type_specifiers
,
4965 const cp_declarator
*declarator
,
4966 bool is_template_arg
)
4970 enum decl_context context
4971 = is_template_arg
? TEMPLATE_TYPE_ARG
: TYPENAME
;
4972 attrs
= type_specifiers
->attributes
;
4973 type_specifiers
->attributes
= NULL_TREE
;
4974 type
= grokdeclarator (declarator
, type_specifiers
, context
, 0, &attrs
);
4975 if (attrs
&& type
!= error_mark_node
)
4977 if (CLASS_TYPE_P (type
))
4978 warning (OPT_Wattributes
, "ignoring attributes applied to class type %qT "
4979 "outside of definition", type
);
4980 else if (MAYBE_CLASS_TYPE_P (type
))
4981 /* A template type parameter or other dependent type. */
4982 warning (OPT_Wattributes
, "ignoring attributes applied to dependent "
4983 "type %qT without an associated declaration", type
);
4985 cplus_decl_attributes (&type
, attrs
, 0);
4990 /* Process a DECLARATOR for a function-scope variable declaration,
4991 namespace-scope variable declaration, or function declaration.
4992 (Function definitions go through start_function; class member
4993 declarations appearing in the body of the class go through
4994 grokfield.) The DECL corresponding to the DECLARATOR is returned.
4995 If an error occurs, the error_mark_node is returned instead.
4997 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
4998 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
4999 for an explicitly defaulted function, or SD_DELETED for an explicitly
5000 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
5001 implicitly initialized via a default constructor. ATTRIBUTES and
5002 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
5004 The scope represented by the context of the returned DECL is pushed
5005 (if it is not the global namespace) and is assigned to
5006 *PUSHED_SCOPE_P. The caller is then responsible for calling
5007 pop_scope on *PUSHED_SCOPE_P if it is set. */
5010 start_decl (const cp_declarator
*declarator
,
5011 cp_decl_specifier_seq
*declspecs
,
5014 tree prefix_attributes
,
5015 tree
*pushed_scope_p
)
5023 *pushed_scope_p
= NULL_TREE
;
5025 /* An object declared as __attribute__((deprecated)) suppresses
5026 warnings of uses of other deprecated items. */
5027 if (lookup_attribute ("deprecated", attributes
))
5028 deprecated_state
= DEPRECATED_SUPPRESS
;
5030 attributes
= chainon (attributes
, prefix_attributes
);
5032 decl
= grokdeclarator (declarator
, declspecs
, NORMAL
, initialized
,
5035 deprecated_state
= DEPRECATED_NORMAL
;
5037 if (decl
== NULL_TREE
|| VOID_TYPE_P (decl
)
5038 || decl
== error_mark_node
)
5039 return error_mark_node
;
5041 context
= CP_DECL_CONTEXT (decl
);
5042 if (context
!= global_namespace
)
5043 *pushed_scope_p
= push_scope (context
);
5045 /* Is it valid for this decl to have an initializer at all?
5046 If not, set INITIALIZED to zero, which will indirectly
5047 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
5049 && TREE_CODE (decl
) == TYPE_DECL
)
5051 error ("typedef %qD is initialized (use decltype instead)", decl
);
5052 return error_mark_node
;
5057 if (! toplevel_bindings_p ()
5058 && DECL_EXTERNAL (decl
))
5059 warning (0, "declaration of %q#D has %<extern%> and is initialized",
5061 DECL_EXTERNAL (decl
) = 0;
5062 if (toplevel_bindings_p ())
5063 TREE_STATIC (decl
) = 1;
5065 alias
= lookup_attribute ("alias", DECL_ATTRIBUTES (decl
)) != 0;
5067 if (alias
&& TREE_CODE (decl
) == FUNCTION_DECL
)
5068 record_key_method_defined (decl
);
5070 /* If this is a typedef that names the class for linkage purposes
5071 (7.1.3p8), apply any attributes directly to the type. */
5072 if (TREE_CODE (decl
) == TYPE_DECL
5073 && OVERLOAD_TYPE_P (TREE_TYPE (decl
))
5074 && decl
== TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl
))))
5075 flags
= ATTR_FLAG_TYPE_IN_PLACE
;
5079 /* Set attributes here so if duplicate decl, will have proper attributes. */
5080 cplus_decl_attributes (&decl
, attributes
, flags
);
5082 /* Dllimported symbols cannot be defined. Static data members (which
5083 can be initialized in-class and dllimported) go through grokfield,
5084 not here, so we don't need to exclude those decls when checking for
5086 if (initialized
&& DECL_DLLIMPORT_P (decl
))
5088 error ("definition of %q#D is marked %<dllimport%>", decl
);
5089 DECL_DLLIMPORT_P (decl
) = 0;
5092 /* If #pragma weak was used, mark the decl weak now. */
5093 if (!processing_template_decl
)
5094 maybe_apply_pragma_weak (decl
);
5096 if (TREE_CODE (decl
) == FUNCTION_DECL
5097 && DECL_DECLARED_INLINE_P (decl
)
5098 && DECL_UNINLINABLE (decl
)
5099 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl
)))
5100 warning_at (DECL_SOURCE_LOCATION (decl
), 0,
5101 "inline function %qD given attribute noinline", decl
);
5103 if (TYPE_P (context
) && COMPLETE_TYPE_P (complete_type (context
)))
5105 bool this_tmpl
= (processing_template_decl
5106 > template_class_depth (context
));
5109 tree field
= lookup_field (context
, DECL_NAME (decl
), 0, false);
5110 if (field
== NULL_TREE
5111 || !(VAR_P (field
) || variable_template_p (field
)))
5112 error ("%q+#D is not a static data member of %q#T", decl
, context
);
5113 else if (variable_template_p (field
)
5114 && (DECL_LANG_SPECIFIC (decl
)
5115 && DECL_TEMPLATE_SPECIALIZATION (decl
)))
5116 /* OK, specialization was already checked. */;
5117 else if (variable_template_p (field
) && !this_tmpl
)
5119 error_at (DECL_SOURCE_LOCATION (decl
),
5120 "non-member-template declaration of %qD", decl
);
5121 inform (DECL_SOURCE_LOCATION (field
), "does not match "
5122 "member template declaration here");
5123 return error_mark_node
;
5127 if (variable_template_p (field
))
5128 field
= DECL_TEMPLATE_RESULT (field
);
5130 if (DECL_CONTEXT (field
) != context
)
5132 if (!same_type_p (DECL_CONTEXT (field
), context
))
5133 permerror (input_location
, "ISO C++ does not permit %<%T::%D%> "
5134 "to be defined as %<%T::%D%>",
5135 DECL_CONTEXT (field
), DECL_NAME (decl
),
5136 context
, DECL_NAME (decl
));
5137 DECL_CONTEXT (decl
) = DECL_CONTEXT (field
);
5139 /* Static data member are tricky; an in-class initialization
5140 still doesn't provide a definition, so the in-class
5141 declaration will have DECL_EXTERNAL set, but will have an
5142 initialization. Thus, duplicate_decls won't warn
5143 about this situation, and so we check here. */
5144 if (initialized
&& DECL_INITIALIZED_IN_CLASS_P (field
))
5145 error ("duplicate initialization of %qD", decl
);
5146 field
= duplicate_decls (decl
, field
,
5147 /*newdecl_is_friend=*/false);
5148 if (field
== error_mark_node
)
5149 return error_mark_node
;
5156 tree field
= check_classfn (context
, decl
,
5158 ? current_template_parms
5160 if (field
&& field
!= error_mark_node
5161 && duplicate_decls (decl
, field
,
5162 /*newdecl_is_friend=*/false))
5166 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
5167 DECL_IN_AGGR_P (decl
) = 0;
5168 /* Do not mark DECL as an explicit specialization if it was not
5169 already marked as an instantiation; a declaration should
5170 never be marked as a specialization unless we know what
5171 template is being specialized. */
5172 if (DECL_LANG_SPECIFIC (decl
) && DECL_USE_TEMPLATE (decl
))
5174 SET_DECL_TEMPLATE_SPECIALIZATION (decl
);
5175 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5176 DECL_COMDAT (decl
) = (TREE_PUBLIC (decl
)
5177 && DECL_DECLARED_INLINE_P (decl
));
5179 DECL_COMDAT (decl
) = false;
5181 /* [temp.expl.spec] An explicit specialization of a static data
5182 member of a template is a definition if the declaration
5183 includes an initializer; otherwise, it is a declaration.
5185 We check for processing_specialization so this only applies
5186 to the new specialization syntax. */
5187 if (!initialized
&& processing_specialization
)
5188 DECL_EXTERNAL (decl
) = 1;
5191 if (DECL_EXTERNAL (decl
) && ! DECL_TEMPLATE_SPECIALIZATION (decl
)
5192 /* Aliases are definitions. */
5194 permerror (input_location
, "declaration of %q#D outside of class is not definition",
5198 was_public
= TREE_PUBLIC (decl
);
5200 /* Enter this declaration into the symbol table. Don't push the plain
5201 VAR_DECL for a variable template. */
5202 if (!template_parm_scope_p ()
5204 decl
= maybe_push_decl (decl
);
5206 if (processing_template_decl
)
5207 decl
= push_template_decl (decl
);
5208 if (decl
== error_mark_node
)
5209 return error_mark_node
;
5212 && DECL_NAMESPACE_SCOPE_P (decl
) && !TREE_PUBLIC (decl
) && !was_public
5213 && !DECL_THIS_STATIC (decl
) && !DECL_ARTIFICIAL (decl
))
5215 /* This is a const variable with implicit 'static'. Set
5216 DECL_THIS_STATIC so we can tell it from variables that are
5217 !TREE_PUBLIC because of the anonymous namespace. */
5218 gcc_assert (CP_TYPE_CONST_P (TREE_TYPE (decl
)) || errorcount
);
5219 DECL_THIS_STATIC (decl
) = 1;
5222 if (current_function_decl
&& VAR_P (decl
)
5223 && DECL_DECLARED_CONSTEXPR_P (current_function_decl
))
5226 if (CP_DECL_THREAD_LOCAL_P (decl
))
5227 error ("%qD declared %<thread_local%> in %<constexpr%> function",
5229 else if (TREE_STATIC (decl
))
5230 error ("%qD declared %<static%> in %<constexpr%> function", decl
);
5234 cp_function_chain
->invalid_constexpr
= true;
5237 if (!processing_template_decl
&& VAR_P (decl
))
5238 start_decl_1 (decl
, initialized
);
5243 /* Process the declaration of a variable DECL. INITIALIZED is true
5244 iff DECL is explicitly initialized. (INITIALIZED is false if the
5245 variable is initialized via an implicitly-called constructor.)
5246 This function must be called for ordinary variables (including, for
5247 example, implicit instantiations of templates), but must not be
5248 called for template declarations. */
5251 start_decl_1 (tree decl
, bool initialized
)
5255 bool aggregate_definition_p
;
5257 gcc_assert (!processing_template_decl
);
5259 if (error_operand_p (decl
))
5262 gcc_assert (VAR_P (decl
));
5264 type
= TREE_TYPE (decl
);
5265 complete_p
= COMPLETE_TYPE_P (type
);
5266 aggregate_definition_p
= MAYBE_CLASS_TYPE_P (type
) && !DECL_EXTERNAL (decl
);
5268 /* If an explicit initializer is present, or if this is a definition
5269 of an aggregate, then we need a complete type at this point.
5270 (Scalars are always complete types, so there is nothing to
5271 check.) This code just sets COMPLETE_P; errors (if necessary)
5272 are issued below. */
5273 if ((initialized
|| aggregate_definition_p
)
5275 && COMPLETE_TYPE_P (complete_type (type
)))
5278 /* We will not yet have set TREE_READONLY on DECL if the type
5279 was "const", but incomplete, before this point. But, now, we
5280 have a complete type, so we can try again. */
5281 cp_apply_type_quals_to_decl (cp_type_quals (type
), decl
);
5285 /* Is it valid for this decl to have an initializer at all? */
5287 /* Don't allow initializations for incomplete types except for
5288 arrays which might be completed by the initialization. */
5290 ; /* A complete type is ok. */
5291 else if (type_uses_auto (type
))
5292 ; /* An auto type is ok. */
5293 else if (TREE_CODE (type
) != ARRAY_TYPE
)
5295 error ("variable %q#D has initializer but incomplete type", decl
);
5296 type
= TREE_TYPE (decl
) = error_mark_node
;
5298 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type
))))
5300 if (DECL_LANG_SPECIFIC (decl
) && DECL_TEMPLATE_INFO (decl
))
5301 error ("elements of array %q#D have incomplete type", decl
);
5302 /* else we already gave an error in start_decl. */
5305 else if (aggregate_definition_p
&& !complete_p
)
5307 if (type_uses_auto (type
))
5308 gcc_assert (CLASS_PLACEHOLDER_TEMPLATE (type
));
5311 error ("aggregate %q#D has incomplete type and cannot be defined",
5313 /* Change the type so that assemble_variable will give
5314 DECL an rtl we can live with: (mem (const_int 0)). */
5315 type
= TREE_TYPE (decl
) = error_mark_node
;
5319 /* Create a new scope to hold this declaration if necessary.
5320 Whether or not a new scope is necessary cannot be determined
5321 until after the type has been completed; if the type is a
5322 specialization of a class template it is not until after
5323 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
5324 will be set correctly. */
5325 maybe_push_cleanup_level (type
);
5328 /* Handle initialization of references. DECL, TYPE, and INIT have the
5329 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
5330 but will be set to a new CLEANUP_STMT if a temporary is created
5331 that must be destroyed subsequently.
5333 Returns an initializer expression to use to initialize DECL, or
5334 NULL if the initialization can be performed statically.
5336 Quotes on semantics can be found in ARM 8.4.3. */
5339 grok_reference_init (tree decl
, tree type
, tree init
, int flags
)
5341 if (init
== NULL_TREE
)
5343 if ((DECL_LANG_SPECIFIC (decl
) == 0
5344 || DECL_IN_AGGR_P (decl
) == 0)
5345 && ! DECL_THIS_EXTERN (decl
))
5346 error ("%qD declared as reference but not initialized", decl
);
5350 if (TREE_CODE (init
) == TREE_LIST
)
5351 init
= build_x_compound_expr_from_list (init
, ELK_INIT
,
5352 tf_warning_or_error
);
5354 tree ttype
= TREE_TYPE (type
);
5355 if (TREE_CODE (ttype
) != ARRAY_TYPE
5356 && TREE_CODE (TREE_TYPE (init
)) == ARRAY_TYPE
)
5357 /* Note: default conversion is only called in very special cases. */
5358 init
= decay_conversion (init
, tf_warning_or_error
);
5360 /* check_initializer handles this for non-reference variables, but for
5361 references we need to do it here or the initializer will get the
5362 incomplete array type and confuse later calls to
5363 cp_complete_array_type. */
5364 if (TREE_CODE (ttype
) == ARRAY_TYPE
5365 && TYPE_DOMAIN (ttype
) == NULL_TREE
5366 && (BRACE_ENCLOSED_INITIALIZER_P (init
)
5367 || TREE_CODE (init
) == STRING_CST
))
5369 cp_complete_array_type (&ttype
, init
, false);
5370 if (ttype
!= TREE_TYPE (type
))
5371 type
= cp_build_reference_type (ttype
, TYPE_REF_IS_RVALUE (type
));
5374 /* Convert INIT to the reference type TYPE. This may involve the
5375 creation of a temporary, whose lifetime must be the same as that
5376 of the reference. If so, a DECL_EXPR for the temporary will be
5377 added just after the DECL_EXPR for DECL. That's why we don't set
5378 DECL_INITIAL for local references (instead assigning to them
5379 explicitly); we need to allow the temporary to be initialized
5381 return initialize_reference (type
, init
, flags
,
5382 tf_warning_or_error
);
5385 /* Designated initializers in arrays are not supported in GNU C++.
5386 The parser cannot detect this error since it does not know whether
5387 a given brace-enclosed initializer is for a class type or for an
5388 array. This function checks that CE does not use a designated
5389 initializer. If it does, an error is issued. Returns true if CE
5390 is valid, i.e., does not have a designated initializer. */
5393 check_array_designated_initializer (constructor_elt
*ce
,
5394 unsigned HOST_WIDE_INT index
)
5396 /* Designated initializers for array elements are not supported. */
5399 /* The parser only allows identifiers as designated
5401 if (ce
->index
== error_mark_node
)
5403 error ("name used in a GNU-style designated "
5404 "initializer for an array");
5407 else if (identifier_p (ce
->index
))
5409 error ("name %qD used in a GNU-style designated "
5410 "initializer for an array", ce
->index
);
5414 tree ce_index
= build_expr_type_conversion (WANT_INT
| WANT_ENUM
,
5417 && INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (ce_index
))
5418 && (TREE_CODE (ce_index
= maybe_constant_value (ce_index
))
5421 /* A C99 designator is OK if it matches the current index. */
5422 if (wi::to_wide (ce_index
) == index
)
5425 sorry ("non-trivial designated initializers not supported");
5428 error ("C99 designator %qE is not an integral constant-expression",
5437 /* When parsing `int a[] = {1, 2};' we don't know the size of the
5438 array until we finish parsing the initializer. If that's the
5439 situation we're in, update DECL accordingly. */
5442 maybe_deduce_size_from_array_init (tree decl
, tree init
)
5444 tree type
= TREE_TYPE (decl
);
5446 if (TREE_CODE (type
) == ARRAY_TYPE
5447 && TYPE_DOMAIN (type
) == NULL_TREE
5448 && TREE_CODE (decl
) != TYPE_DECL
)
5450 /* do_default is really a C-ism to deal with tentative definitions.
5451 But let's leave it here to ease the eventual merge. */
5452 int do_default
= !DECL_EXTERNAL (decl
);
5453 tree initializer
= init
? init
: DECL_INITIAL (decl
);
5456 /* Check that there are no designated initializers in INIT, as
5457 those are not supported in GNU C++, and as the middle-end
5458 will crash if presented with a non-numeric designated
5460 if (initializer
&& BRACE_ENCLOSED_INITIALIZER_P (initializer
))
5462 vec
<constructor_elt
, va_gc
> *v
= CONSTRUCTOR_ELTS (initializer
);
5463 constructor_elt
*ce
;
5465 FOR_EACH_VEC_SAFE_ELT (v
, i
, ce
)
5466 if (!check_array_designated_initializer (ce
, i
))
5471 TREE_TYPE (decl
) = error_mark_node
;
5474 failure
= cp_complete_array_type (&TREE_TYPE (decl
), initializer
,
5478 error_at (EXPR_LOC_OR_LOC (initializer
,
5479 DECL_SOURCE_LOCATION (decl
)),
5480 "initializer fails to determine size of %qD", decl
);
5482 else if (failure
== 2)
5486 error_at (DECL_SOURCE_LOCATION (decl
),
5487 "array size missing in %qD", decl
);
5489 /* If a `static' var's size isn't known, make it extern as
5490 well as static, so it does not get allocated. If it's not
5491 `static', then don't mark it extern; finish_incomplete_decl
5492 will give it a default size and it will get allocated. */
5493 else if (!pedantic
&& TREE_STATIC (decl
) && !TREE_PUBLIC (decl
))
5494 DECL_EXTERNAL (decl
) = 1;
5496 else if (failure
== 3)
5498 error_at (DECL_SOURCE_LOCATION (decl
),
5499 "zero-size array %qD", decl
);
5503 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl
)), decl
);
5505 relayout_decl (decl
);
5509 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
5510 any appropriate error messages regarding the layout. */
5513 layout_var_decl (tree decl
)
5517 type
= TREE_TYPE (decl
);
5518 if (type
== error_mark_node
)
5521 /* If we haven't already laid out this declaration, do so now.
5522 Note that we must not call complete type for an external object
5523 because it's type might involve templates that we are not
5524 supposed to instantiate yet. (And it's perfectly valid to say
5525 `extern X x' for some incomplete type `X'.) */
5526 if (!DECL_EXTERNAL (decl
))
5527 complete_type (type
);
5528 if (!DECL_SIZE (decl
)
5529 && TREE_TYPE (decl
) != error_mark_node
5530 && complete_or_array_type_p (type
))
5531 layout_decl (decl
, 0);
5533 if (!DECL_EXTERNAL (decl
) && DECL_SIZE (decl
) == NULL_TREE
)
5535 /* An automatic variable with an incomplete type: that is an error.
5536 Don't talk about array types here, since we took care of that
5537 message in grokdeclarator. */
5538 error_at (DECL_SOURCE_LOCATION (decl
),
5539 "storage size of %qD isn%'t known", decl
);
5540 TREE_TYPE (decl
) = error_mark_node
;
5543 /* Keep this code around in case we later want to control debug info
5544 based on whether a type is "used". (jason 1999-11-11) */
5546 else if (!DECL_EXTERNAL (decl
) && MAYBE_CLASS_TYPE_P (ttype
))
5547 /* Let debugger know it should output info for this type. */
5548 note_debug_info_needed (ttype
);
5550 if (TREE_STATIC (decl
) && DECL_CLASS_SCOPE_P (decl
))
5551 note_debug_info_needed (DECL_CONTEXT (decl
));
5554 if ((DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
5555 && DECL_SIZE (decl
) != NULL_TREE
5556 && ! TREE_CONSTANT (DECL_SIZE (decl
)))
5558 if (TREE_CODE (DECL_SIZE (decl
)) == INTEGER_CST
)
5559 constant_expression_warning (DECL_SIZE (decl
));
5562 error_at (DECL_SOURCE_LOCATION (decl
),
5563 "storage size of %qD isn%'t constant", decl
);
5564 TREE_TYPE (decl
) = error_mark_node
;
5569 /* If a local static variable is declared in an inline function, or if
5570 we have a weak definition, we must endeavor to create only one
5571 instance of the variable at link-time. */
5574 maybe_commonize_var (tree decl
)
5576 /* Static data in a function with comdat linkage also has comdat
5578 if ((TREE_STATIC (decl
)
5579 /* Don't mess with __FUNCTION__. */
5580 && ! DECL_ARTIFICIAL (decl
)
5581 && DECL_FUNCTION_SCOPE_P (decl
)
5582 && vague_linkage_p (DECL_CONTEXT (decl
)))
5583 || (TREE_PUBLIC (decl
) && DECL_INLINE_VAR_P (decl
)))
5587 /* With weak symbols, we simply make the variable COMDAT;
5588 that will cause copies in multiple translations units to
5590 comdat_linkage (decl
);
5594 if (DECL_INITIAL (decl
) == NULL_TREE
5595 || DECL_INITIAL (decl
) == error_mark_node
)
5597 /* Without weak symbols, we can use COMMON to merge
5598 uninitialized variables. */
5599 TREE_PUBLIC (decl
) = 1;
5600 DECL_COMMON (decl
) = 1;
5604 /* While for initialized variables, we must use internal
5605 linkage -- which means that multiple copies will not
5607 TREE_PUBLIC (decl
) = 0;
5608 DECL_COMMON (decl
) = 0;
5610 if (DECL_INLINE_VAR_P (decl
))
5611 msg
= G_("sorry: semantics of inline variable "
5612 "%q#D are wrong (you%'ll wind up with "
5613 "multiple copies)");
5615 msg
= G_("sorry: semantics of inline function "
5616 "static data %q#D are wrong (you%'ll wind "
5617 "up with multiple copies)");
5618 if (warning_at (DECL_SOURCE_LOCATION (decl
), 0,
5620 inform (DECL_SOURCE_LOCATION (decl
),
5621 "you can work around this by removing the initializer");
5627 /* Issue an error message if DECL is an uninitialized const variable.
5628 CONSTEXPR_CONTEXT_P is true when the function is called in a constexpr
5629 context from potential_constant_expression. Returns true if all is well,
5633 check_for_uninitialized_const_var (tree decl
, bool constexpr_context_p
,
5634 tsubst_flags_t complain
)
5636 tree type
= strip_array_types (TREE_TYPE (decl
));
5638 /* ``Unless explicitly declared extern, a const object does not have
5639 external linkage and must be initialized. ($8.4; $12.1)'' ARM
5642 && TREE_CODE (type
) != REFERENCE_TYPE
5643 && (constexpr_context_p
5644 || CP_TYPE_CONST_P (type
) || var_in_constexpr_fn (decl
))
5645 && !DECL_NONTRIVIALLY_INITIALIZED_P (decl
))
5647 tree field
= default_init_uninitialized_part (type
);
5651 if (!constexpr_context_p
)
5653 if (CP_TYPE_CONST_P (type
))
5655 if (complain
& tf_error
)
5656 permerror (DECL_SOURCE_LOCATION (decl
),
5657 "uninitialized const %qD", decl
);
5661 if (!is_instantiation_of_constexpr (current_function_decl
)
5662 && (complain
& tf_error
))
5663 error_at (DECL_SOURCE_LOCATION (decl
),
5664 "uninitialized variable %qD in %<constexpr%> "
5666 cp_function_chain
->invalid_constexpr
= true;
5669 else if (complain
& tf_error
)
5670 error_at (DECL_SOURCE_LOCATION (decl
),
5671 "uninitialized variable %qD in %<constexpr%> context",
5674 if (CLASS_TYPE_P (type
) && (complain
& tf_error
))
5676 tree defaulted_ctor
;
5678 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (type
)),
5679 "%q#T has no user-provided default constructor", type
);
5680 defaulted_ctor
= in_class_defaulted_default_constructor (type
);
5682 inform (DECL_SOURCE_LOCATION (defaulted_ctor
),
5683 "constructor is not user-provided because it is "
5684 "explicitly defaulted in the class body");
5685 inform (DECL_SOURCE_LOCATION (field
),
5686 "and the implicitly-defined constructor does not "
5687 "initialize %q#D", field
);
5696 /* Structure holding the current initializer being processed by reshape_init.
5697 CUR is a pointer to the current element being processed, END is a pointer
5698 after the last element present in the initializer. */
5701 constructor_elt
*cur
;
5702 constructor_elt
*end
;
5705 static tree
reshape_init_r (tree
, reshape_iter
*, bool, tsubst_flags_t
);
5707 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
5708 returned is the next FIELD_DECL (possibly FIELD itself) that can be
5709 initialized. If there are no more such fields, the return value
5713 next_initializable_field (tree field
)
5716 && (TREE_CODE (field
) != FIELD_DECL
5717 || DECL_UNNAMED_BIT_FIELD (field
)
5718 || (DECL_ARTIFICIAL (field
)
5719 && !(cxx_dialect
>= cxx17
&& DECL_FIELD_IS_BASE (field
)))))
5720 field
= DECL_CHAIN (field
);
5725 /* Return true for [dcl.init.list] direct-list-initialization from
5726 single element of enumeration with a fixed underlying type. */
5729 is_direct_enum_init (tree type
, tree init
)
5731 if (cxx_dialect
>= cxx17
5732 && TREE_CODE (type
) == ENUMERAL_TYPE
5733 && ENUM_FIXED_UNDERLYING_TYPE_P (type
)
5734 && TREE_CODE (init
) == CONSTRUCTOR
5735 && CONSTRUCTOR_IS_DIRECT_INIT (init
)
5736 && CONSTRUCTOR_NELTS (init
) == 1)
5741 /* Subroutine of reshape_init_array and reshape_init_vector, which does
5742 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
5743 INTEGER_CST representing the size of the array minus one (the maximum index),
5744 or NULL_TREE if the array was declared without specifying the size. D is
5745 the iterator within the constructor. */
5748 reshape_init_array_1 (tree elt_type
, tree max_index
, reshape_iter
*d
,
5749 tsubst_flags_t complain
)
5752 bool sized_array_p
= (max_index
&& TREE_CONSTANT (max_index
));
5753 unsigned HOST_WIDE_INT max_index_cst
= 0;
5754 unsigned HOST_WIDE_INT index
;
5756 /* The initializer for an array is always a CONSTRUCTOR. */
5757 new_init
= build_constructor (init_list_type_node
, NULL
);
5761 /* Minus 1 is used for zero sized arrays. */
5762 if (integer_all_onesp (max_index
))
5765 if (tree_fits_uhwi_p (max_index
))
5766 max_index_cst
= tree_to_uhwi (max_index
);
5767 /* sizetype is sign extended, not zero extended. */
5769 max_index_cst
= tree_to_uhwi (fold_convert (size_type_node
, max_index
));
5772 /* Loop until there are no more initializers. */
5774 d
->cur
!= d
->end
&& (!sized_array_p
|| index
<= max_index_cst
);
5778 constructor_elt
*old_cur
= d
->cur
;
5780 check_array_designated_initializer (d
->cur
, index
);
5781 elt_init
= reshape_init_r (elt_type
, d
, /*first_initializer_p=*/false,
5783 if (elt_init
== error_mark_node
)
5784 return error_mark_node
;
5785 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init
),
5786 size_int (index
), elt_init
);
5787 if (!TREE_CONSTANT (elt_init
))
5788 TREE_CONSTANT (new_init
) = false;
5790 /* This can happen with an invalid initializer (c++/54501). */
5791 if (d
->cur
== old_cur
&& !sized_array_p
)
5798 /* Subroutine of reshape_init_r, processes the initializers for arrays.
5799 Parameters are the same of reshape_init_r. */
5802 reshape_init_array (tree type
, reshape_iter
*d
, tsubst_flags_t complain
)
5804 tree max_index
= NULL_TREE
;
5806 gcc_assert (TREE_CODE (type
) == ARRAY_TYPE
);
5808 if (TYPE_DOMAIN (type
))
5809 max_index
= array_type_nelts (type
);
5811 return reshape_init_array_1 (TREE_TYPE (type
), max_index
, d
, complain
);
5814 /* Subroutine of reshape_init_r, processes the initializers for vectors.
5815 Parameters are the same of reshape_init_r. */
5818 reshape_init_vector (tree type
, reshape_iter
*d
, tsubst_flags_t complain
)
5820 tree max_index
= NULL_TREE
;
5822 gcc_assert (VECTOR_TYPE_P (type
));
5824 if (COMPOUND_LITERAL_P (d
->cur
->value
))
5826 tree value
= d
->cur
->value
;
5827 if (!same_type_p (TREE_TYPE (value
), type
))
5829 if (complain
& tf_error
)
5830 error ("invalid type %qT as initializer for a vector of type %qT",
5831 TREE_TYPE (d
->cur
->value
), type
);
5832 value
= error_mark_node
;
5838 /* For a vector, we initialize it as an array of the appropriate size. */
5839 if (VECTOR_TYPE_P (type
))
5840 max_index
= size_int (TYPE_VECTOR_SUBPARTS (type
) - 1);
5842 return reshape_init_array_1 (TREE_TYPE (type
), max_index
, d
, complain
);
5845 /* Subroutine of reshape_init_r, processes the initializers for classes
5846 or union. Parameters are the same of reshape_init_r. */
5849 reshape_init_class (tree type
, reshape_iter
*d
, bool first_initializer_p
,
5850 tsubst_flags_t complain
)
5855 gcc_assert (CLASS_TYPE_P (type
));
5857 /* The initializer for a class is always a CONSTRUCTOR. */
5858 new_init
= build_constructor (init_list_type_node
, NULL
);
5859 field
= next_initializable_field (TYPE_FIELDS (type
));
5865 An initializer for an aggregate member that is an
5866 empty class shall have the form of an empty
5867 initializer-list {}. */
5868 if (!first_initializer_p
)
5870 if (complain
& tf_error
)
5871 error ("initializer for %qT must be brace-enclosed", type
);
5872 return error_mark_node
;
5877 /* Loop through the initializable fields, gathering initializers. */
5878 while (d
->cur
!= d
->end
)
5881 constructor_elt
*old_cur
= d
->cur
;
5883 /* Handle designated initializers, as an extension. */
5886 if (d
->cur
->index
== error_mark_node
)
5887 return error_mark_node
;
5889 if (TREE_CODE (d
->cur
->index
) == FIELD_DECL
)
5891 /* We already reshaped this. */
5892 if (field
!= d
->cur
->index
)
5894 tree id
= DECL_NAME (d
->cur
->index
);
5896 gcc_checking_assert (d
->cur
->index
5897 == get_class_binding (type
, id
, false));
5898 field
= d
->cur
->index
;
5901 else if (TREE_CODE (d
->cur
->index
) == IDENTIFIER_NODE
)
5902 field
= get_class_binding (type
, d
->cur
->index
, false);
5905 if (complain
& tf_error
)
5906 error ("%<[%E] =%> used in a GNU-style designated initializer"
5907 " for class %qT", d
->cur
->index
, type
);
5908 return error_mark_node
;
5911 if (!field
|| TREE_CODE (field
) != FIELD_DECL
)
5913 if (complain
& tf_error
)
5914 error ("%qT has no non-static data member named %qD", type
,
5916 return error_mark_node
;
5920 /* If we processed all the member of the class, we are done. */
5924 field_init
= reshape_init_r (TREE_TYPE (field
), d
,
5925 /*first_initializer_p=*/false, complain
);
5926 if (field_init
== error_mark_node
)
5927 return error_mark_node
;
5929 if (d
->cur
== old_cur
&& d
->cur
->index
)
5931 /* This can happen with an invalid initializer for a flexible
5932 array member (c++/54441). */
5933 if (complain
& tf_error
)
5934 error ("invalid initializer for %q#D", field
);
5935 return error_mark_node
;
5938 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init
), field
, field_init
);
5942 When a union is initialized with a brace-enclosed
5943 initializer, the braces shall only contain an
5944 initializer for the first member of the union. */
5945 if (TREE_CODE (type
) == UNION_TYPE
)
5948 field
= next_initializable_field (DECL_CHAIN (field
));
5954 /* Subroutine of reshape_init_r. We're in a context where C99 initializer
5955 designators are not valid; either complain or return true to indicate
5956 that reshape_init_r should return error_mark_node. */
5959 has_designator_problem (reshape_iter
*d
, tsubst_flags_t complain
)
5963 if (complain
& tf_error
)
5964 error ("C99 designator %qE outside aggregate initializer",
5972 /* Subroutine of reshape_init, which processes a single initializer (part of
5973 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
5974 iterator within the CONSTRUCTOR which points to the initializer to process.
5975 FIRST_INITIALIZER_P is true if this is the first initializer of the
5976 outermost CONSTRUCTOR node. */
5979 reshape_init_r (tree type
, reshape_iter
*d
, bool first_initializer_p
,
5980 tsubst_flags_t complain
)
5982 tree init
= d
->cur
->value
;
5984 if (error_operand_p (init
))
5985 return error_mark_node
;
5987 if (first_initializer_p
&& !CP_AGGREGATE_TYPE_P (type
)
5988 && has_designator_problem (d
, complain
))
5989 return error_mark_node
;
5991 if (TREE_CODE (type
) == COMPLEX_TYPE
)
5993 /* A complex type can be initialized from one or two initializers,
5994 but braces are not elided. */
5996 if (BRACE_ENCLOSED_INITIALIZER_P (init
))
5998 if (CONSTRUCTOR_NELTS (init
) > 2)
6000 if (complain
& tf_error
)
6001 error ("too many initializers for %qT", type
);
6003 return error_mark_node
;
6006 else if (first_initializer_p
&& d
->cur
!= d
->end
)
6008 vec
<constructor_elt
, va_gc
> *v
= 0;
6009 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, init
);
6010 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, d
->cur
->value
);
6011 if (has_designator_problem (d
, complain
))
6012 return error_mark_node
;
6014 init
= build_constructor (init_list_type_node
, v
);
6019 /* A non-aggregate type is always initialized with a single
6021 if (!CP_AGGREGATE_TYPE_P (type
))
6023 /* It is invalid to initialize a non-aggregate type with a
6024 brace-enclosed initializer before C++0x.
6025 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
6026 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
6027 a CONSTRUCTOR (with a record type). */
6028 if (TREE_CODE (init
) == CONSTRUCTOR
6029 /* Don't complain about a capture-init. */
6030 && !CONSTRUCTOR_IS_DIRECT_INIT (init
)
6031 && BRACE_ENCLOSED_INITIALIZER_P (init
)) /* p7626.C */
6033 if (SCALAR_TYPE_P (type
))
6035 if (cxx_dialect
< cxx11
6036 /* Isn't value-initialization. */
6037 || CONSTRUCTOR_NELTS (init
) > 0)
6039 if (complain
& tf_error
)
6040 error ("braces around scalar initializer for type %qT",
6042 init
= error_mark_node
;
6046 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS
);
6053 /* "If T is a class type and the initializer list has a single element of
6054 type cv U, where U is T or a class derived from T, the object is
6055 initialized from that element." Even if T is an aggregate. */
6056 if (cxx_dialect
>= cxx11
&& (CLASS_TYPE_P (type
) || VECTOR_TYPE_P (type
))
6057 && first_initializer_p
6058 && d
->end
- d
->cur
== 1
6059 && reference_related_p (type
, TREE_TYPE (init
)))
6067 All implicit type conversions (clause _conv_) are considered when
6068 initializing the aggregate member with an initializer from an
6069 initializer-list. If the initializer can initialize a member,
6070 the member is initialized. Otherwise, if the member is itself a
6071 non-empty subaggregate, brace elision is assumed and the
6072 initializer is considered for the initialization of the first
6073 member of the subaggregate. */
6074 if (TREE_CODE (init
) != CONSTRUCTOR
6075 /* But don't try this for the first initializer, since that would be
6076 looking through the outermost braces; A a2 = { a1 }; is not a
6077 valid aggregate initialization. */
6078 && !first_initializer_p
6079 && (same_type_ignoring_top_level_qualifiers_p (type
, TREE_TYPE (init
))
6080 || can_convert_arg (type
, TREE_TYPE (init
), init
, LOOKUP_NORMAL
,
6087 /* [dcl.init.string]
6089 A char array (whether plain char, signed char, or unsigned char)
6090 can be initialized by a string-literal (optionally enclosed in
6091 braces); a wchar_t array can be initialized by a wide
6092 string-literal (optionally enclosed in braces). */
6093 if (TREE_CODE (type
) == ARRAY_TYPE
6094 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type
))))
6096 tree str_init
= init
;
6098 /* Strip one level of braces if and only if they enclose a single
6099 element (as allowed by [dcl.init.string]). */
6100 if (!first_initializer_p
6101 && TREE_CODE (str_init
) == CONSTRUCTOR
6102 && CONSTRUCTOR_NELTS (str_init
) == 1)
6104 str_init
= (*CONSTRUCTOR_ELTS (str_init
))[0].value
;
6107 /* If it's a string literal, then it's the initializer for the array
6108 as a whole. Otherwise, continue with normal initialization for
6109 array types (one value per array element). */
6110 if (TREE_CODE (str_init
) == STRING_CST
)
6112 if (has_designator_problem (d
, complain
))
6113 return error_mark_node
;
6119 /* The following cases are about aggregates. If we are not within a full
6120 initializer already, and there is not a CONSTRUCTOR, it means that there
6121 is a missing set of braces (that is, we are processing the case for
6122 which reshape_init exists). */
6123 if (!first_initializer_p
)
6125 if (TREE_CODE (init
) == CONSTRUCTOR
)
6127 if (TREE_TYPE (init
) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init
)))
6128 /* There is no need to reshape pointer-to-member function
6129 initializers, as they are always constructed correctly
6130 by the front end. */
6132 else if (COMPOUND_LITERAL_P (init
))
6133 /* For a nested compound literal, there is no need to reshape since
6134 brace elision is not allowed. Even if we decided to allow it,
6135 we should add a call to reshape_init in finish_compound_literal,
6136 before calling digest_init, so changing this code would still
6137 not be necessary. */
6138 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init
));
6142 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init
));
6143 return reshape_init (type
, init
, complain
);
6147 if (complain
& tf_warning
)
6148 warning (OPT_Wmissing_braces
,
6149 "missing braces around initializer for %qT",
6153 /* Dispatch to specialized routines. */
6154 if (CLASS_TYPE_P (type
))
6155 return reshape_init_class (type
, d
, first_initializer_p
, complain
);
6156 else if (TREE_CODE (type
) == ARRAY_TYPE
)
6157 return reshape_init_array (type
, d
, complain
);
6158 else if (VECTOR_TYPE_P (type
))
6159 return reshape_init_vector (type
, d
, complain
);
6164 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
6165 brace-enclosed aggregate initializer.
6167 INIT is the CONSTRUCTOR containing the list of initializers describing
6168 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
6169 It may not presently match the shape of the TYPE; for example:
6171 struct S { int a; int b; };
6172 struct S a[] = { 1, 2, 3, 4 };
6174 Here INIT will hold a vector of four elements, rather than a
6175 vector of two elements, each itself a vector of two elements. This
6176 routine transforms INIT from the former form into the latter. The
6177 revised CONSTRUCTOR node is returned. */
6180 reshape_init (tree type
, tree init
, tsubst_flags_t complain
)
6182 vec
<constructor_elt
, va_gc
> *v
;
6186 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init
));
6188 v
= CONSTRUCTOR_ELTS (init
);
6190 /* An empty constructor does not need reshaping, and it is always a valid
6192 if (vec_safe_is_empty (v
))
6195 /* Handle [dcl.init.list] direct-list-initialization from
6196 single element of enumeration with a fixed underlying type. */
6197 if (is_direct_enum_init (type
, init
))
6199 tree elt
= CONSTRUCTOR_ELT (init
, 0)->value
;
6200 type
= cv_unqualified (type
);
6201 if (check_narrowing (ENUM_UNDERLYING_TYPE (type
), elt
, complain
))
6203 warning_sentinel
w (warn_useless_cast
);
6204 warning_sentinel
w2 (warn_ignored_qualifiers
);
6205 return cp_build_c_cast (type
, elt
, tf_warning_or_error
);
6208 return error_mark_node
;
6211 /* Recurse on this CONSTRUCTOR. */
6213 d
.end
= d
.cur
+ v
->length ();
6215 new_init
= reshape_init_r (type
, &d
, true, complain
);
6216 if (new_init
== error_mark_node
)
6217 return error_mark_node
;
6219 /* Make sure all the element of the constructor were used. Otherwise,
6220 issue an error about exceeding initializers. */
6223 if (complain
& tf_error
)
6224 error ("too many initializers for %qT", type
);
6225 return error_mark_node
;
6228 if (CONSTRUCTOR_IS_DIRECT_INIT (init
)
6229 && BRACE_ENCLOSED_INITIALIZER_P (new_init
))
6230 CONSTRUCTOR_IS_DIRECT_INIT (new_init
) = true;
6235 /* Verify array initializer. Returns true if errors have been reported. */
6238 check_array_initializer (tree decl
, tree type
, tree init
)
6240 tree element_type
= TREE_TYPE (type
);
6242 /* The array type itself need not be complete, because the
6243 initializer may tell us how many elements are in the array.
6244 But, the elements of the array must be complete. */
6245 if (!COMPLETE_TYPE_P (complete_type (element_type
)))
6248 error_at (DECL_SOURCE_LOCATION (decl
),
6249 "elements of array %q#D have incomplete type", decl
);
6251 error ("elements of array %q#T have incomplete type", type
);
6254 /* A compound literal can't have variable size. */
6256 && ((COMPLETE_TYPE_P (type
) && !TREE_CONSTANT (TYPE_SIZE (type
)))
6257 || !TREE_CONSTANT (TYPE_SIZE (element_type
))))
6259 error ("variable-sized compound literal");
6265 /* Subroutine of check_initializer; args are passed down from that function.
6266 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
6269 build_aggr_init_full_exprs (tree decl
, tree init
, int flags
)
6272 gcc_assert (stmts_are_full_exprs_p ());
6273 return build_aggr_init (decl
, init
, flags
, tf_warning_or_error
);
6276 /* Verify INIT (the initializer for DECL), and record the
6277 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
6278 grok_reference_init.
6280 If the return value is non-NULL, it is an expression that must be
6281 evaluated dynamically to initialize DECL. */
6284 check_initializer (tree decl
, tree init
, int flags
, vec
<tree
, va_gc
> **cleanups
)
6286 tree type
= TREE_TYPE (decl
);
6287 tree init_code
= NULL
;
6290 /* Things that are going to be initialized need to have complete
6292 TREE_TYPE (decl
) = type
= complete_type (TREE_TYPE (decl
));
6294 if (DECL_HAS_VALUE_EXPR_P (decl
))
6296 /* A variable with DECL_HAS_VALUE_EXPR_P set is just a placeholder,
6297 it doesn't have storage to be initialized. */
6298 gcc_assert (init
== NULL_TREE
);
6302 if (type
== error_mark_node
)
6303 /* We will have already complained. */
6306 if (TREE_CODE (type
) == ARRAY_TYPE
)
6308 if (check_array_initializer (decl
, type
, init
))
6311 else if (!COMPLETE_TYPE_P (type
))
6313 error_at (DECL_SOURCE_LOCATION (decl
),
6314 "%q#D has incomplete type", decl
);
6315 TREE_TYPE (decl
) = error_mark_node
;
6319 /* There is no way to make a variable-sized class type in GNU C++. */
6320 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type
)));
6322 if (init
&& BRACE_ENCLOSED_INITIALIZER_P (init
))
6324 int init_len
= CONSTRUCTOR_NELTS (init
);
6325 if (SCALAR_TYPE_P (type
))
6329 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS
);
6330 init
= build_zero_init (type
, NULL_TREE
, false);
6332 else if (init_len
!= 1 && TREE_CODE (type
) != COMPLEX_TYPE
)
6334 error_at (EXPR_LOC_OR_LOC (init
, DECL_SOURCE_LOCATION (decl
)),
6335 "scalar object %qD requires one element in "
6336 "initializer", decl
);
6337 TREE_TYPE (decl
) = error_mark_node
;
6343 if (TREE_CODE (decl
) == CONST_DECL
)
6345 gcc_assert (TREE_CODE (type
) != REFERENCE_TYPE
);
6347 DECL_INITIAL (decl
) = init
;
6349 gcc_assert (init
!= NULL_TREE
);
6352 else if (!init
&& DECL_REALLY_EXTERN (decl
))
6354 else if (init
|| type_build_ctor_call (type
)
6355 || TREE_CODE (type
) == REFERENCE_TYPE
)
6357 if (TREE_CODE (type
) == REFERENCE_TYPE
)
6359 init
= grok_reference_init (decl
, type
, init
, flags
);
6360 flags
|= LOOKUP_ALREADY_DIGESTED
;
6363 check_for_uninitialized_const_var (decl
, /*constexpr_context_p=*/false,
6364 tf_warning_or_error
);
6365 /* Do not reshape constructors of vectors (they don't need to be
6367 else if (BRACE_ENCLOSED_INITIALIZER_P (init
))
6369 if (is_std_init_list (type
))
6371 init
= perform_implicit_conversion (type
, init
,
6372 tf_warning_or_error
);
6373 flags
|= LOOKUP_ALREADY_DIGESTED
;
6375 else if (TYPE_NON_AGGREGATE_CLASS (type
))
6377 /* Don't reshape if the class has constructors. */
6378 if (cxx_dialect
== cxx98
)
6379 error_at (EXPR_LOC_OR_LOC (init
, DECL_SOURCE_LOCATION (decl
)),
6380 "in C++98 %qD must be initialized by "
6381 "constructor, not by %<{...}%>",
6384 else if (VECTOR_TYPE_P (type
) && TYPE_VECTOR_OPAQUE (type
))
6386 error ("opaque vector types cannot be initialized");
6387 init
= error_mark_node
;
6391 init
= reshape_init (type
, init
, tf_warning_or_error
);
6392 flags
|= LOOKUP_NO_NARROWING
;
6395 else if (TREE_CODE (init
) == TREE_LIST
6396 && TREE_TYPE (init
) != unknown_type_node
6397 && !MAYBE_CLASS_TYPE_P (type
))
6399 gcc_assert (TREE_CODE (decl
) != RESULT_DECL
);
6401 /* We get here with code like `int a (2);' */
6402 init
= build_x_compound_expr_from_list (init
, ELK_INIT
,
6403 tf_warning_or_error
);
6406 /* If DECL has an array type without a specific bound, deduce the
6407 array size from the initializer. */
6408 maybe_deduce_size_from_array_init (decl
, init
);
6409 type
= TREE_TYPE (decl
);
6410 if (type
== error_mark_node
)
6413 if (((type_build_ctor_call (type
) || CLASS_TYPE_P (type
))
6414 && !(flags
& LOOKUP_ALREADY_DIGESTED
)
6415 && !(init
&& BRACE_ENCLOSED_INITIALIZER_P (init
)
6416 && CP_AGGREGATE_TYPE_P (type
)
6417 && (CLASS_TYPE_P (type
)
6418 || !TYPE_NEEDS_CONSTRUCTING (type
)
6419 || type_has_extended_temps (type
))))
6420 || (DECL_DECOMPOSITION_P (decl
) && TREE_CODE (type
) == ARRAY_TYPE
))
6422 init_code
= build_aggr_init_full_exprs (decl
, init
, flags
);
6424 /* A constructor call is a non-trivial initializer even if
6425 it isn't explicitly written. */
6426 if (TREE_SIDE_EFFECTS (init_code
))
6427 DECL_NONTRIVIALLY_INITIALIZED_P (decl
) = true;
6429 /* If this is a constexpr initializer, expand_default_init will
6430 have returned an INIT_EXPR rather than a CALL_EXPR. In that
6431 case, pull the initializer back out and pass it down into
6432 store_init_value. */
6433 while (TREE_CODE (init_code
) == EXPR_STMT
6434 || TREE_CODE (init_code
) == CONVERT_EXPR
)
6435 init_code
= TREE_OPERAND (init_code
, 0);
6436 if (TREE_CODE (init_code
) == INIT_EXPR
)
6438 init
= TREE_OPERAND (init_code
, 1);
6439 init_code
= NULL_TREE
;
6440 /* Don't call digest_init; it's unnecessary and will complain
6441 about aggregate initialization of non-aggregate classes. */
6442 flags
|= LOOKUP_ALREADY_DIGESTED
;
6444 else if (DECL_DECLARED_CONSTEXPR_P (decl
))
6446 /* Declared constexpr, but no suitable initializer; massage
6447 init appropriately so we can pass it into store_init_value
6449 if (CLASS_TYPE_P (type
)
6450 && (!init
|| TREE_CODE (init
) == TREE_LIST
))
6452 init
= build_functional_cast (type
, init
, tf_none
);
6453 if (TREE_CODE (init
) == TARGET_EXPR
)
6454 TARGET_EXPR_DIRECT_INIT_P (init
) = true;
6456 init_code
= NULL_TREE
;
6462 if (init
&& TREE_CODE (init
) != TREE_VEC
)
6464 /* In aggregate initialization of a variable, each element
6465 initialization is a full-expression because there is no
6466 enclosing expression. */
6467 gcc_assert (stmts_are_full_exprs_p ());
6469 init_code
= store_init_value (decl
, init
, cleanups
, flags
);
6471 if (pedantic
&& TREE_CODE (type
) == ARRAY_TYPE
6472 && DECL_INITIAL (decl
)
6473 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
6474 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl
)))
6475 warning_at (EXPR_LOC_OR_LOC (DECL_INITIAL (decl
),
6476 DECL_SOURCE_LOCATION (decl
)),
6477 0, "array %qD initialized by parenthesized "
6478 "string literal %qE",
6479 decl
, DECL_INITIAL (decl
));
6485 if (CLASS_TYPE_P (core_type
= strip_array_types (type
))
6486 && (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type
)
6487 || CLASSTYPE_REF_FIELDS_NEED_INIT (core_type
)))
6488 diagnose_uninitialized_cst_or_ref_member (core_type
, /*using_new=*/false,
6491 check_for_uninitialized_const_var (decl
, /*constexpr_context_p=*/false,
6492 tf_warning_or_error
);
6495 if (init
&& init
!= error_mark_node
)
6496 init_code
= build2 (INIT_EXPR
, type
, decl
, init
);
6500 /* We might have set these in cp_finish_decl. */
6501 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
) = false;
6502 TREE_CONSTANT (decl
) = false;
6506 && (DECL_IN_AGGR_P (decl
) && !DECL_VAR_DECLARED_INLINE_P (decl
)))
6508 static int explained
= 0;
6510 if (cxx_dialect
< cxx11
)
6511 error ("initializer invalid for static member with constructor");
6512 else if (cxx_dialect
< cxx17
)
6513 error ("non-constant in-class initialization invalid for static "
6514 "member %qD", decl
);
6516 error ("non-constant in-class initialization invalid for non-inline "
6517 "static member %qD", decl
);
6520 inform (input_location
,
6521 "(an out of class initialization is required)");
6530 /* If DECL is not a local variable, give it RTL. */
6533 make_rtl_for_nonlocal_decl (tree decl
, tree init
, const char* asmspec
)
6535 int toplev
= toplevel_bindings_p ();
6538 /* Set the DECL_ASSEMBLER_NAME for the object. */
6541 /* The `register' keyword, when used together with an
6542 asm-specification, indicates that the variable should be
6543 placed in a particular register. */
6544 if (VAR_P (decl
) && DECL_REGISTER (decl
))
6546 set_user_assembler_name (decl
, asmspec
);
6547 DECL_HARD_REGISTER (decl
) = 1;
6551 if (TREE_CODE (decl
) == FUNCTION_DECL
6552 && DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
)
6553 set_builtin_user_assembler_name (decl
, asmspec
);
6554 set_user_assembler_name (decl
, asmspec
);
6558 /* Handle non-variables up front. */
6561 rest_of_decl_compilation (decl
, toplev
, at_eof
);
6565 /* If we see a class member here, it should be a static data
6567 if (DECL_LANG_SPECIFIC (decl
) && DECL_IN_AGGR_P (decl
))
6569 gcc_assert (TREE_STATIC (decl
));
6570 /* An in-class declaration of a static data member should be
6571 external; it is only a declaration, and not a definition. */
6572 if (init
== NULL_TREE
)
6573 gcc_assert (DECL_EXTERNAL (decl
)
6574 || !TREE_PUBLIC (decl
)
6575 || DECL_INLINE_VAR_P (decl
));
6578 /* We don't create any RTL for local variables. */
6579 if (DECL_FUNCTION_SCOPE_P (decl
) && !TREE_STATIC (decl
))
6582 /* We defer emission of local statics until the corresponding
6583 DECL_EXPR is expanded. But with constexpr its function might never
6584 be expanded, so go ahead and tell cgraph about the variable now. */
6585 defer_p
= ((DECL_FUNCTION_SCOPE_P (decl
)
6586 && !var_in_maybe_constexpr_fn (decl
))
6587 || DECL_VIRTUAL_P (decl
));
6589 /* Defer template instantiations. */
6590 if (DECL_LANG_SPECIFIC (decl
)
6591 && DECL_IMPLICIT_INSTANTIATION (decl
))
6594 /* If we're not deferring, go ahead and assemble the variable. */
6596 rest_of_decl_compilation (decl
, toplev
, at_eof
);
6599 /* walk_tree helper for wrap_temporary_cleanups, below. */
6602 wrap_cleanups_r (tree
*stmt_p
, int *walk_subtrees
, void *data
)
6604 /* Stop at types or full-expression boundaries. */
6605 if (TYPE_P (*stmt_p
)
6606 || TREE_CODE (*stmt_p
) == CLEANUP_POINT_EXPR
)
6612 if (TREE_CODE (*stmt_p
) == TARGET_EXPR
)
6614 tree guard
= (tree
)data
;
6615 tree tcleanup
= TARGET_EXPR_CLEANUP (*stmt_p
);
6617 tcleanup
= build2 (TRY_CATCH_EXPR
, void_type_node
, tcleanup
, guard
);
6618 /* Tell honor_protect_cleanup_actions to handle this as a separate
6620 TRY_CATCH_IS_CLEANUP (tcleanup
) = 1;
6622 TARGET_EXPR_CLEANUP (*stmt_p
) = tcleanup
;
6628 /* We're initializing a local variable which has a cleanup GUARD. If there
6629 are any temporaries used in the initializer INIT of this variable, we
6630 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
6631 variable will be cleaned up properly if one of them throws.
6633 Unfortunately, there's no way to express this properly in terms of
6634 nesting, as the regions for the temporaries overlap the region for the
6635 variable itself; if there are two temporaries, the variable needs to be
6636 the first thing destroyed if either of them throws. However, we only
6637 want to run the variable's cleanup if it actually got constructed. So
6638 we need to guard the temporary cleanups with the variable's cleanup if
6639 they are run on the normal path, but not if they are run on the
6640 exceptional path. We implement this by telling
6641 honor_protect_cleanup_actions to strip the variable cleanup from the
6642 exceptional path. */
6645 wrap_temporary_cleanups (tree init
, tree guard
)
6647 cp_walk_tree_without_duplicates (&init
, wrap_cleanups_r
, (void *)guard
);
6650 /* Generate code to initialize DECL (a local variable). */
6653 initialize_local_var (tree decl
, tree init
)
6655 tree type
= TREE_TYPE (decl
);
6659 gcc_assert (VAR_P (decl
)
6660 || TREE_CODE (decl
) == RESULT_DECL
);
6661 gcc_assert (!TREE_STATIC (decl
));
6663 if (DECL_SIZE (decl
) == NULL_TREE
)
6665 /* If we used it already as memory, it must stay in memory. */
6666 DECL_INITIAL (decl
) = NULL_TREE
;
6667 TREE_ADDRESSABLE (decl
) = TREE_USED (decl
);
6671 if (type
== error_mark_node
)
6674 /* Compute and store the initial value. */
6675 already_used
= TREE_USED (decl
) || TREE_USED (type
);
6676 if (TREE_USED (type
))
6677 DECL_READ_P (decl
) = 1;
6679 /* Generate a cleanup, if necessary. */
6680 cleanup
= cxx_maybe_build_cleanup (decl
, tf_warning_or_error
);
6682 /* Perform the initialization. */
6685 tree rinit
= (TREE_CODE (init
) == INIT_EXPR
6686 ? TREE_OPERAND (init
, 1) : NULL_TREE
);
6687 if (rinit
&& !TREE_SIDE_EFFECTS (rinit
))
6689 /* Stick simple initializers in DECL_INITIAL so that
6690 -Wno-init-self works (c++/34772). */
6691 gcc_assert (TREE_OPERAND (init
, 0) == decl
);
6692 DECL_INITIAL (decl
) = rinit
;
6694 if (warn_init_self
&& TREE_CODE (type
) == REFERENCE_TYPE
)
6698 warning_at (DECL_SOURCE_LOCATION (decl
),
6700 "reference %qD is initialized with itself", decl
);
6705 int saved_stmts_are_full_exprs_p
;
6707 /* If we're only initializing a single object, guard the
6708 destructors of any temporaries used in its initializer with
6709 its destructor. This isn't right for arrays because each
6710 element initialization is a full-expression. */
6711 if (cleanup
&& TREE_CODE (type
) != ARRAY_TYPE
)
6712 wrap_temporary_cleanups (init
, cleanup
);
6714 gcc_assert (building_stmt_list_p ());
6715 saved_stmts_are_full_exprs_p
= stmts_are_full_exprs_p ();
6716 current_stmt_tree ()->stmts_are_full_exprs_p
= 1;
6717 finish_expr_stmt (init
);
6718 current_stmt_tree ()->stmts_are_full_exprs_p
=
6719 saved_stmts_are_full_exprs_p
;
6723 /* Set this to 0 so we can tell whether an aggregate which was
6724 initialized was ever used. Don't do this if it has a
6725 destructor, so we don't complain about the 'resource
6726 allocation is initialization' idiom. Now set
6727 attribute((unused)) on types so decls of that type will be
6728 marked used. (see TREE_USED, above.) */
6729 if (TYPE_NEEDS_CONSTRUCTING (type
)
6731 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type
)
6732 && DECL_NAME (decl
))
6733 TREE_USED (decl
) = 0;
6734 else if (already_used
)
6735 TREE_USED (decl
) = 1;
6738 finish_decl_cleanup (decl
, cleanup
);
6741 /* DECL is a VAR_DECL for a compiler-generated variable with static
6742 storage duration (like a virtual table) whose initializer is a
6743 compile-time constant. Initialize the variable and provide it to the
6747 initialize_artificial_var (tree decl
, vec
<constructor_elt
, va_gc
> *v
)
6750 gcc_assert (DECL_ARTIFICIAL (decl
));
6751 init
= build_constructor (TREE_TYPE (decl
), v
);
6752 gcc_assert (TREE_CODE (init
) == CONSTRUCTOR
);
6753 DECL_INITIAL (decl
) = init
;
6754 DECL_INITIALIZED_P (decl
) = 1;
6755 determine_visibility (decl
);
6756 layout_var_decl (decl
);
6757 maybe_commonize_var (decl
);
6758 make_rtl_for_nonlocal_decl (decl
, init
, /*asmspec=*/NULL
);
6761 /* INIT is the initializer for a variable, as represented by the
6762 parser. Returns true iff INIT is value-dependent. */
6765 value_dependent_init_p (tree init
)
6767 if (TREE_CODE (init
) == TREE_LIST
)
6768 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
6769 return any_value_dependent_elements_p (init
);
6770 else if (TREE_CODE (init
) == CONSTRUCTOR
)
6771 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
6773 if (dependent_type_p (TREE_TYPE (init
)))
6776 vec
<constructor_elt
, va_gc
> *elts
;
6780 elts
= CONSTRUCTOR_ELTS (init
);
6781 nelts
= vec_safe_length (elts
);
6782 for (i
= 0; i
< nelts
; ++i
)
6783 if (value_dependent_init_p ((*elts
)[i
].value
))
6787 /* It must be a simple expression, e.g., int i = 3; */
6788 return value_dependent_expression_p (init
);
6793 // Returns true if a DECL is VAR_DECL with the concept specifier.
6795 is_concept_var (tree decl
)
6797 return (VAR_P (decl
)
6798 // Not all variables have DECL_LANG_SPECIFIC.
6799 && DECL_LANG_SPECIFIC (decl
)
6800 && DECL_DECLARED_CONCEPT_P (decl
));
6803 /* A helper function to be called via walk_tree. If any label exists
6804 under *TP, it is (going to be) forced. Set has_forced_label_in_static. */
6807 notice_forced_label_r (tree
*tp
, int *walk_subtrees
, void *)
6811 if (TREE_CODE (*tp
) == LABEL_DECL
)
6812 cfun
->has_forced_label_in_static
= 1;
6816 /* Finish processing of a declaration;
6817 install its line number and initial value.
6818 If the length of an array type is not known before,
6819 it must be determined now, from the initial value, or it is an error.
6821 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
6822 true, then INIT is an integral constant expression.
6824 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
6825 if the (init) syntax was used. */
6828 cp_finish_decl (tree decl
, tree init
, bool init_const_expr_p
,
6829 tree asmspec_tree
, int flags
)
6832 vec
<tree
, va_gc
> *cleanups
= NULL
;
6833 const char *asmspec
= NULL
;
6834 int was_readonly
= 0;
6835 bool var_definition_p
= false;
6838 if (decl
== error_mark_node
)
6843 error ("assignment (not initialization) in declaration");
6847 gcc_assert (TREE_CODE (decl
) != RESULT_DECL
);
6848 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
6849 gcc_assert (TREE_CODE (decl
) != PARM_DECL
);
6851 type
= TREE_TYPE (decl
);
6852 if (type
== error_mark_node
)
6855 /* Warn about register storage specifiers except when in GNU global
6856 or local register variable extension. */
6857 if (VAR_P (decl
) && DECL_REGISTER (decl
) && asmspec_tree
== NULL_TREE
)
6859 if (cxx_dialect
>= cxx17
)
6860 pedwarn (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
6861 "ISO C++17 does not allow %<register%> storage "
6864 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
6865 "%<register%> storage class specifier used");
6868 /* If a name was specified, get the string. */
6869 if (at_namespace_scope_p ())
6870 asmspec_tree
= maybe_apply_renaming_pragma (decl
, asmspec_tree
);
6871 if (asmspec_tree
&& asmspec_tree
!= error_mark_node
)
6872 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
6874 if (current_class_type
6875 && CP_DECL_CONTEXT (decl
) == current_class_type
6876 && TYPE_BEING_DEFINED (current_class_type
)
6877 && !CLASSTYPE_TEMPLATE_INSTANTIATION (current_class_type
)
6878 && (DECL_INITIAL (decl
) || init
))
6879 DECL_INITIALIZED_IN_CLASS_P (decl
) = 1;
6881 if (TREE_CODE (decl
) != FUNCTION_DECL
6882 && (auto_node
= type_uses_auto (type
)))
6885 if (init
== NULL_TREE
)
6887 if (DECL_LANG_SPECIFIC (decl
)
6888 && DECL_TEMPLATE_INSTANTIATION (decl
)
6889 && !DECL_TEMPLATE_INSTANTIATED (decl
))
6891 /* init is null because we're deferring instantiating the
6892 initializer until we need it. Well, we need it now. */
6893 instantiate_decl (decl
, /*defer_ok*/true, /*expl*/false);
6897 gcc_assert (CLASS_PLACEHOLDER_TEMPLATE (auto_node
));
6902 if (TREE_CODE (d_init
) == TREE_LIST
6903 && !CLASS_PLACEHOLDER_TEMPLATE (auto_node
))
6904 d_init
= build_x_compound_expr_from_list (d_init
, ELK_INIT
,
6905 tf_warning_or_error
);
6906 d_init
= resolve_nondeduced_context (d_init
, tf_warning_or_error
);
6908 enum auto_deduction_context adc
= adc_variable_type
;
6909 if (VAR_P (decl
) && DECL_DECOMPOSITION_P (decl
))
6910 adc
= adc_decomp_type
;
6911 type
= TREE_TYPE (decl
) = do_auto_deduction (type
, d_init
, auto_node
,
6912 tf_warning_or_error
, adc
,
6914 if (type
== error_mark_node
)
6916 if (TREE_CODE (type
) == FUNCTION_TYPE
)
6918 error ("initializer for %<decltype(auto) %D%> has function type "
6919 "(did you forget the %<()%> ?)", decl
);
6920 TREE_TYPE (decl
) = error_mark_node
;
6923 cp_apply_type_quals_to_decl (cp_type_quals (type
), decl
);
6926 if (ensure_literal_type_for_constexpr_object (decl
) == error_mark_node
)
6928 DECL_DECLARED_CONSTEXPR_P (decl
) = 0;
6929 if (VAR_P (decl
) && DECL_CLASS_SCOPE_P (decl
))
6932 DECL_EXTERNAL (decl
) = 1;
6937 && DECL_CLASS_SCOPE_P (decl
)
6938 && DECL_INITIALIZED_IN_CLASS_P (decl
))
6939 check_static_variable_definition (decl
, type
);
6941 if (init
&& TREE_CODE (decl
) == FUNCTION_DECL
)
6944 if (init
== ridpointers
[(int)RID_DELETE
])
6946 /* FIXME check this is 1st decl. */
6947 DECL_DELETED_FN (decl
) = 1;
6948 DECL_DECLARED_INLINE_P (decl
) = 1;
6949 DECL_INITIAL (decl
) = error_mark_node
;
6950 FOR_EACH_CLONE (clone
, decl
)
6952 DECL_DELETED_FN (clone
) = 1;
6953 DECL_DECLARED_INLINE_P (clone
) = 1;
6954 DECL_INITIAL (clone
) = error_mark_node
;
6958 else if (init
== ridpointers
[(int)RID_DEFAULT
])
6960 if (defaultable_fn_check (decl
))
6961 DECL_DEFAULTED_FN (decl
) = 1;
6963 DECL_INITIAL (decl
) = NULL_TREE
;
6967 if (init
&& VAR_P (decl
))
6969 DECL_NONTRIVIALLY_INITIALIZED_P (decl
) = 1;
6970 /* If DECL is a reference, then we want to know whether init is a
6971 reference constant; init_const_expr_p as passed tells us whether
6972 it's an rvalue constant. */
6973 if (TREE_CODE (type
) == REFERENCE_TYPE
)
6974 init_const_expr_p
= potential_constant_expression (init
);
6975 if (init_const_expr_p
)
6977 /* Set these flags now for templates. We'll update the flags in
6978 store_init_value for instantiations. */
6979 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
) = 1;
6980 if (decl_maybe_constant_var_p (decl
)
6981 /* FIXME setting TREE_CONSTANT on refs breaks the back end. */
6982 && TREE_CODE (type
) != REFERENCE_TYPE
)
6983 TREE_CONSTANT (decl
) = 1;
6987 if (processing_template_decl
)
6989 bool type_dependent_p
;
6991 /* Add this declaration to the statement-tree. */
6992 if (at_function_scope_p ())
6993 add_decl_expr (decl
);
6995 type_dependent_p
= dependent_type_p (type
);
6997 if (check_for_bare_parameter_packs (init
))
7000 DECL_INITIAL (decl
) = NULL_TREE
;
7003 /* Generally, initializers in templates are expanded when the
7004 template is instantiated. But, if DECL is a variable constant
7005 then it can be used in future constant expressions, so its value
7006 must be available. */
7008 bool dep_init
= false;
7010 if (!VAR_P (decl
) || type_dependent_p
)
7011 /* We can't do anything if the decl has dependent type. */;
7012 else if (!init
&& is_concept_var (decl
))
7014 error ("variable concept has no initializer");
7015 init
= boolean_true_node
;
7018 && init_const_expr_p
7019 && TREE_CODE (type
) != REFERENCE_TYPE
7020 && decl_maybe_constant_var_p (decl
)
7021 && !(dep_init
= value_dependent_init_p (init
)))
7023 /* This variable seems to be a non-dependent constant, so process
7024 its initializer. If check_initializer returns non-null the
7025 initialization wasn't constant after all. */
7027 cleanups
= make_tree_vector ();
7028 init_code
= check_initializer (decl
, init
, flags
, &cleanups
);
7029 if (init_code
== NULL_TREE
)
7031 release_tree_vector (cleanups
);
7033 else if (!DECL_PRETTY_FUNCTION_P (decl
))
7035 /* Deduce array size even if the initializer is dependent. */
7036 maybe_deduce_size_from_array_init (decl
, init
);
7037 /* And complain about multiple initializers. */
7038 if (init
&& TREE_CODE (init
) == TREE_LIST
&& TREE_CHAIN (init
)
7039 && !MAYBE_CLASS_TYPE_P (type
))
7040 init
= build_x_compound_expr_from_list (init
, ELK_INIT
,
7041 tf_warning_or_error
);
7046 if (TREE_CODE (init
) == TREE_LIST
)
7047 lookup_list_keep (init
, true);
7048 DECL_INITIAL (decl
) = init
;
7052 retrofit_lang_decl (decl
);
7053 SET_DECL_DEPENDENT_INIT_P (decl
, true);
7058 /* Just store non-static data member initializers for later. */
7059 if (init
&& TREE_CODE (decl
) == FIELD_DECL
)
7060 DECL_INITIAL (decl
) = init
;
7062 /* Take care of TYPE_DECLs up front. */
7063 if (TREE_CODE (decl
) == TYPE_DECL
)
7065 if (type
!= error_mark_node
7066 && MAYBE_CLASS_TYPE_P (type
) && DECL_NAME (decl
))
7068 if (TREE_TYPE (DECL_NAME (decl
)) && TREE_TYPE (decl
) != type
)
7069 warning (0, "shadowing previous type declaration of %q#D", decl
);
7070 set_identifier_type_value (DECL_NAME (decl
), decl
);
7073 /* If we have installed this as the canonical typedef for this
7074 type, and that type has not been defined yet, delay emitting
7075 the debug information for it, as we will emit it later. */
7076 if (TYPE_MAIN_DECL (TREE_TYPE (decl
)) == decl
7077 && !COMPLETE_TYPE_P (TREE_TYPE (decl
)))
7078 TYPE_DECL_SUPPRESS_DEBUG (decl
) = 1;
7080 rest_of_decl_compilation (decl
, DECL_FILE_SCOPE_P (decl
),
7085 /* A reference will be modified here, as it is initialized. */
7086 if (! DECL_EXTERNAL (decl
)
7087 && TREE_READONLY (decl
)
7088 && TREE_CODE (type
) == REFERENCE_TYPE
)
7091 TREE_READONLY (decl
) = 0;
7096 /* If this is a local variable that will need a mangled name,
7097 register it now. We must do this before processing the
7098 initializer for the variable, since the initialization might
7099 require a guard variable, and since the mangled name of the
7100 guard variable will depend on the mangled name of this
7102 if (DECL_FUNCTION_SCOPE_P (decl
)
7103 && TREE_STATIC (decl
)
7104 && !DECL_ARTIFICIAL (decl
))
7106 push_local_name (decl
);
7107 /* Normally has_forced_label_in_static is set during GIMPLE
7108 lowering, but [cd]tors are never actually compiled directly.
7109 We need to set this early so we can deal with the label
7110 address extension. */
7111 if ((DECL_CONSTRUCTOR_P (current_function_decl
)
7112 || DECL_DESTRUCTOR_P (current_function_decl
))
7115 walk_tree (&init
, notice_forced_label_r
, NULL
, NULL
);
7116 add_local_decl (cfun
, decl
);
7118 /* And make sure it's in the symbol table for
7119 c_parse_final_cleanups to find. */
7120 varpool_node::get_create (decl
);
7123 /* Convert the initializer to the type of DECL, if we have not
7124 already initialized DECL. */
7125 if (!DECL_INITIALIZED_P (decl
)
7126 /* If !DECL_EXTERNAL then DECL is being defined. In the
7127 case of a static data member initialized inside the
7128 class-specifier, there can be an initializer even if DECL
7129 is *not* defined. */
7130 && (!DECL_EXTERNAL (decl
) || init
))
7132 cleanups
= make_tree_vector ();
7133 init
= check_initializer (decl
, init
, flags
, &cleanups
);
7139 The memory occupied by any object of static storage
7140 duration is zero-initialized at program startup before
7141 any other initialization takes place.
7143 We cannot create an appropriate initializer until after
7144 the type of DECL is finalized. If DECL_INITIAL is set,
7145 then the DECL is statically initialized, and any
7146 necessary zero-initialization has already been performed. */
7147 if (TREE_STATIC (decl
) && !DECL_INITIAL (decl
))
7148 DECL_INITIAL (decl
) = build_zero_init (TREE_TYPE (decl
),
7149 /*nelts=*/NULL_TREE
,
7150 /*static_storage_p=*/true);
7151 /* Remember that the initialization for this variable has
7153 DECL_INITIALIZED_P (decl
) = 1;
7154 /* This declaration is the definition of this variable,
7155 unless we are initializing a static data member within
7156 the class specifier. */
7157 if (!DECL_EXTERNAL (decl
))
7158 var_definition_p
= true;
7160 /* If the variable has an array type, lay out the type, even if
7161 there is no initializer. It is valid to index through the
7162 array, and we must get TYPE_ALIGN set correctly on the array
7164 else if (TREE_CODE (type
) == ARRAY_TYPE
)
7167 if (TREE_STATIC (decl
)
7168 && !at_function_scope_p ()
7169 && current_function_decl
== NULL
)
7170 /* So decl is a global variable or a static member of a
7171 non local class. Record the types it uses
7172 so that we can decide later to emit debug info for them. */
7173 record_types_used_by_current_var_decl (decl
);
7176 /* Add this declaration to the statement-tree. This needs to happen
7177 after the call to check_initializer so that the DECL_EXPR for a
7178 reference temp is added before the DECL_EXPR for the reference itself. */
7179 if (DECL_FUNCTION_SCOPE_P (decl
))
7181 /* If we're building a variable sized type, and we might be
7182 reachable other than via the top of the current binding
7183 level, then create a new BIND_EXPR so that we deallocate
7184 the object at the right time. */
7187 && !TREE_CONSTANT (DECL_SIZE (decl
))
7188 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list
))
7191 bind
= build3 (BIND_EXPR
, void_type_node
, NULL
, NULL
, NULL
);
7192 TREE_SIDE_EFFECTS (bind
) = 1;
7194 BIND_EXPR_BODY (bind
) = push_stmt_list ();
7196 add_decl_expr (decl
);
7199 /* Let the middle end know about variables and functions -- but not
7200 static data members in uninstantiated class templates. */
7201 if (VAR_OR_FUNCTION_DECL_P (decl
))
7205 layout_var_decl (decl
);
7206 maybe_commonize_var (decl
);
7209 /* This needs to happen after the linkage is set. */
7210 determine_visibility (decl
);
7212 if (var_definition_p
&& TREE_STATIC (decl
))
7214 /* If a TREE_READONLY variable needs initialization
7215 at runtime, it is no longer readonly and we need to
7216 avoid MEM_READONLY_P being set on RTL created for it. */
7219 if (TREE_READONLY (decl
))
7220 TREE_READONLY (decl
) = 0;
7223 else if (was_readonly
)
7224 TREE_READONLY (decl
) = 1;
7226 /* Likewise if it needs destruction. */
7227 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
))
7228 TREE_READONLY (decl
) = 0;
7231 make_rtl_for_nonlocal_decl (decl
, init
, asmspec
);
7233 /* Check for abstractness of the type. Notice that there is no
7234 need to strip array types here since the check for those types
7235 is already done within create_array_type_for_decl. */
7236 abstract_virtuals_error (decl
, type
);
7238 if (TREE_TYPE (decl
) == error_mark_node
)
7239 /* No initialization required. */
7241 else if (TREE_CODE (decl
) == FUNCTION_DECL
)
7245 if (init
== ridpointers
[(int)RID_DEFAULT
])
7247 /* An out-of-class default definition is defined at
7248 the point where it is explicitly defaulted. */
7249 if (DECL_DELETED_FN (decl
))
7250 maybe_explain_implicit_delete (decl
);
7251 else if (DECL_INITIAL (decl
) == error_mark_node
)
7252 synthesize_method (decl
);
7255 error ("function %q#D is initialized like a variable", decl
);
7257 /* else no initialization required. */
7259 else if (DECL_EXTERNAL (decl
)
7260 && ! (DECL_LANG_SPECIFIC (decl
)
7261 && DECL_NOT_REALLY_EXTERN (decl
)))
7264 DECL_INITIAL (decl
) = init
;
7266 /* A variable definition. */
7267 else if (DECL_FUNCTION_SCOPE_P (decl
) && !TREE_STATIC (decl
))
7268 /* Initialize the local variable. */
7269 initialize_local_var (decl
, init
);
7271 /* If a variable is defined, and then a subsequent
7272 definition with external linkage is encountered, we will
7273 get here twice for the same variable. We want to avoid
7274 calling expand_static_init more than once. For variables
7275 that are not static data members, we can call
7276 expand_static_init only when we actually process the
7277 initializer. It is not legal to redeclare a static data
7278 member, so this issue does not arise in that case. */
7279 else if (var_definition_p
&& TREE_STATIC (decl
))
7280 expand_static_init (decl
, init
);
7283 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
7284 reference, insert it in the statement-tree now. */
7288 FOR_EACH_VEC_ELT (*cleanups
, i
, t
)
7289 push_cleanup (decl
, t
, false);
7290 release_tree_vector (cleanups
);
7294 TREE_READONLY (decl
) = 1;
7296 invoke_plugin_callbacks (PLUGIN_FINISH_DECL
, decl
);
7299 /* For class TYPE return itself or some its bases that contain
7300 any direct non-static data members. Return error_mark_node if an
7301 error has been diagnosed. */
7304 find_decomp_class_base (location_t loc
, tree type
, tree ret
)
7306 bool member_seen
= false;
7307 for (tree field
= TYPE_FIELDS (type
); field
; field
= DECL_CHAIN (field
))
7308 if (TREE_CODE (field
) != FIELD_DECL
7309 || DECL_ARTIFICIAL (field
)
7310 || DECL_UNNAMED_BIT_FIELD (field
))
7314 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field
)))
7316 if (TREE_CODE (TREE_TYPE (field
)) == RECORD_TYPE
)
7317 error_at (loc
, "cannot decompose class type %qT because it has an "
7318 "anonymous struct member", type
);
7320 error_at (loc
, "cannot decompose class type %qT because it has an "
7321 "anonymous union member", type
);
7322 inform (DECL_SOURCE_LOCATION (field
), "declared here");
7323 return error_mark_node
;
7325 else if (TREE_PRIVATE (field
) || TREE_PROTECTED (field
))
7327 error_at (loc
, "cannot decompose non-public member %qD of %qT",
7329 inform (DECL_SOURCE_LOCATION (field
),
7330 TREE_PRIVATE (field
)
7331 ? G_("declared private here")
7332 : G_("declared protected here"));
7333 return error_mark_node
;
7338 tree base_binfo
, binfo
;
7339 tree orig_ret
= ret
;
7343 for (binfo
= TYPE_BINFO (type
), i
= 0;
7344 BINFO_BASE_ITERATE (binfo
, i
, base_binfo
); i
++)
7346 tree t
= find_decomp_class_base (loc
, TREE_TYPE (base_binfo
), ret
);
7347 if (t
== error_mark_node
)
7348 return error_mark_node
;
7349 if (t
!= NULL_TREE
&& t
!= ret
)
7353 error_at (loc
, "cannot decompose class type %qT: both it and "
7354 "its base class %qT have non-static data members",
7356 return error_mark_node
;
7358 else if (orig_ret
!= NULL_TREE
)
7360 else if (ret
!= NULL_TREE
)
7362 error_at (loc
, "cannot decompose class type %qT: its base "
7363 "classes %qT and %qT have non-static data "
7364 "members", type
, ret
, t
);
7365 return error_mark_node
;
7374 /* Return std::tuple_size<TYPE>::value. */
7377 get_tuple_size (tree type
)
7379 tree args
= make_tree_vec (1);
7380 TREE_VEC_ELT (args
, 0) = type
;
7381 tree inst
= lookup_template_class (get_identifier ("tuple_size"), args
,
7382 /*in_decl*/NULL_TREE
,
7383 /*context*/std_node
,
7384 /*entering_scope*/false, tf_none
);
7385 inst
= complete_type (inst
);
7386 if (inst
== error_mark_node
|| !COMPLETE_TYPE_P (inst
))
7388 tree val
= lookup_qualified_name (inst
, get_identifier ("value"),
7389 /*type*/false, /*complain*/false);
7390 if (TREE_CODE (val
) == VAR_DECL
|| TREE_CODE (val
) == CONST_DECL
)
7391 val
= maybe_constant_value (val
);
7392 if (TREE_CODE (val
) == INTEGER_CST
)
7395 return error_mark_node
;
7398 /* Return std::tuple_element<I,TYPE>::type. */
7401 get_tuple_element_type (tree type
, unsigned i
)
7403 tree args
= make_tree_vec (2);
7404 TREE_VEC_ELT (args
, 0) = build_int_cst (integer_type_node
, i
);
7405 TREE_VEC_ELT (args
, 1) = type
;
7406 tree inst
= lookup_template_class (get_identifier ("tuple_element"), args
,
7407 /*in_decl*/NULL_TREE
,
7408 /*context*/std_node
,
7409 /*entering_scope*/false,
7410 tf_warning_or_error
);
7411 return make_typename_type (inst
, get_identifier ("type"),
7412 none_type
, tf_warning_or_error
);
7415 /* Return e.get<i>() or get<i>(e). */
7418 get_tuple_decomp_init (tree decl
, unsigned i
)
7420 tree get_id
= get_identifier ("get");
7421 tree targs
= make_tree_vec (1);
7422 TREE_VEC_ELT (targs
, 0) = build_int_cst (integer_type_node
, i
);
7424 tree etype
= TREE_TYPE (decl
);
7425 tree e
= convert_from_reference (decl
);
7427 /* [The id-expression] e is an lvalue if the type of the entity e is an
7428 lvalue reference and an xvalue otherwise. */
7429 if (TREE_CODE (etype
) != REFERENCE_TYPE
7430 || TYPE_REF_IS_RVALUE (etype
))
7433 tree fns
= lookup_qualified_name (TREE_TYPE (e
), get_id
,
7434 /*type*/false, /*complain*/false);
7435 if (fns
!= error_mark_node
)
7437 fns
= lookup_template_function (fns
, targs
);
7438 return build_new_method_call (e
, fns
, /*args*/NULL
,
7439 /*path*/NULL_TREE
, LOOKUP_NORMAL
,
7440 /*fn_p*/NULL
, tf_warning_or_error
);
7444 vec
<tree
,va_gc
> *args
= make_tree_vector_single (e
);
7445 fns
= lookup_template_function (get_id
, targs
);
7446 fns
= perform_koenig_lookup (fns
, args
, tf_warning_or_error
);
7447 return finish_call_expr (fns
, &args
, /*novirt*/false,
7448 /*koenig*/true, tf_warning_or_error
);
7452 /* It's impossible to recover the decltype of a tuple decomposition variable
7453 based on the actual type of the variable, so store it in a hash table. */
7455 static GTY((cache
)) tree_cache_map
*decomp_type_table
;
7457 store_decomp_type (tree v
, tree t
)
7459 if (!decomp_type_table
)
7460 decomp_type_table
= tree_cache_map::create_ggc (13);
7461 decomp_type_table
->put (v
, t
);
7465 lookup_decomp_type (tree v
)
7467 return *decomp_type_table
->get (v
);
7470 /* Mangle a decomposition declaration if needed. Arguments like
7471 in cp_finish_decomp. */
7474 cp_maybe_mangle_decomp (tree decl
, tree first
, unsigned int count
)
7476 if (!processing_template_decl
7477 && !error_operand_p (decl
)
7478 && DECL_NAMESPACE_SCOPE_P (decl
))
7480 auto_vec
<tree
, 16> v
;
7481 v
.safe_grow (count
);
7483 for (unsigned int i
= 0; i
< count
; i
++, d
= DECL_CHAIN (d
))
7484 v
[count
- i
- 1] = d
;
7485 SET_DECL_ASSEMBLER_NAME (decl
, mangle_decomp (decl
, v
));
7489 /* Finish a decomposition declaration. DECL is the underlying declaration
7490 "e", FIRST is the head of a chain of decls for the individual identifiers
7491 chained through DECL_CHAIN in reverse order and COUNT is the number of
7495 cp_finish_decomp (tree decl
, tree first
, unsigned int count
)
7497 if (error_operand_p (decl
))
7502 TREE_TYPE (first
) = error_mark_node
;
7503 if (DECL_HAS_VALUE_EXPR_P (first
))
7505 SET_DECL_VALUE_EXPR (first
, NULL_TREE
);
7506 DECL_HAS_VALUE_EXPR_P (first
) = 0;
7508 first
= DECL_CHAIN (first
);
7510 if (DECL_P (decl
) && DECL_NAMESPACE_SCOPE_P (decl
))
7511 SET_DECL_ASSEMBLER_NAME (decl
, get_identifier ("<decomp>"));
7515 location_t loc
= DECL_SOURCE_LOCATION (decl
);
7516 if (type_dependent_expression_p (decl
)
7517 /* This happens for range for when not in templates.
7518 Still add the DECL_VALUE_EXPRs for later processing. */
7519 || (!processing_template_decl
7520 && type_uses_auto (TREE_TYPE (decl
))))
7522 for (unsigned int i
= 0; i
< count
; i
++)
7524 if (!DECL_HAS_VALUE_EXPR_P (first
))
7526 tree v
= build_nt (ARRAY_REF
, decl
,
7527 size_int (count
- i
- 1),
7528 NULL_TREE
, NULL_TREE
);
7529 SET_DECL_VALUE_EXPR (first
, v
);
7530 DECL_HAS_VALUE_EXPR_P (first
) = 1;
7532 if (processing_template_decl
)
7533 fit_decomposition_lang_decl (first
, decl
);
7534 first
= DECL_CHAIN (first
);
7539 auto_vec
<tree
, 16> v
;
7540 v
.safe_grow (count
);
7542 for (unsigned int i
= 0; i
< count
; i
++, d
= DECL_CHAIN (d
))
7544 v
[count
- i
- 1] = d
;
7545 fit_decomposition_lang_decl (d
, decl
);
7548 tree type
= TREE_TYPE (decl
);
7551 if (TREE_CODE (type
) == REFERENCE_TYPE
)
7553 dexp
= convert_from_reference (dexp
);
7554 type
= complete_type (TREE_TYPE (type
));
7555 if (type
== error_mark_node
)
7557 if (!COMPLETE_TYPE_P (type
))
7559 error_at (loc
, "structured binding refers to incomplete type %qT",
7565 tree eltype
= NULL_TREE
;
7566 unsigned HOST_WIDE_INT eltscnt
= 0;
7567 if (TREE_CODE (type
) == ARRAY_TYPE
)
7570 nelts
= array_type_nelts_top (type
);
7571 if (nelts
== error_mark_node
)
7573 if (!tree_fits_uhwi_p (nelts
))
7575 error_at (loc
, "cannot decompose variable length array %qT", type
);
7578 eltscnt
= tree_to_uhwi (nelts
);
7579 if (count
!= eltscnt
)
7582 if (count
> eltscnt
)
7583 error_n (loc
, count
,
7584 "%u name provided for structured binding",
7585 "%u names provided for structured binding", count
);
7587 error_n (loc
, count
,
7588 "only %u name provided for structured binding",
7589 "only %u names provided for structured binding", count
);
7590 inform_n (loc
, eltscnt
,
7591 "while %qT decomposes into %wu element",
7592 "while %qT decomposes into %wu elements",
7596 eltype
= TREE_TYPE (type
);
7597 for (unsigned int i
= 0; i
< count
; i
++)
7599 TREE_TYPE (v
[i
]) = eltype
;
7600 layout_decl (v
[i
], 0);
7601 if (processing_template_decl
)
7603 tree t
= unshare_expr (dexp
);
7604 t
= build4_loc (DECL_SOURCE_LOCATION (v
[i
]), ARRAY_REF
,
7605 eltype
, t
, size_int (i
), NULL_TREE
,
7607 SET_DECL_VALUE_EXPR (v
[i
], t
);
7608 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7611 /* 2 GNU extensions. */
7612 else if (TREE_CODE (type
) == COMPLEX_TYPE
)
7615 if (count
!= eltscnt
)
7617 eltype
= cp_build_qualified_type (TREE_TYPE (type
), TYPE_QUALS (type
));
7618 for (unsigned int i
= 0; i
< count
; i
++)
7620 TREE_TYPE (v
[i
]) = eltype
;
7621 layout_decl (v
[i
], 0);
7622 if (processing_template_decl
)
7624 tree t
= unshare_expr (dexp
);
7625 t
= build1_loc (DECL_SOURCE_LOCATION (v
[i
]),
7626 i
? IMAGPART_EXPR
: REALPART_EXPR
, eltype
,
7628 SET_DECL_VALUE_EXPR (v
[i
], t
);
7629 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7632 else if (TREE_CODE (type
) == VECTOR_TYPE
)
7634 if (!TYPE_VECTOR_SUBPARTS (type
).is_constant (&eltscnt
))
7636 error_at (loc
, "cannot decompose variable length vector %qT", type
);
7639 if (count
!= eltscnt
)
7641 eltype
= cp_build_qualified_type (TREE_TYPE (type
), TYPE_QUALS (type
));
7642 for (unsigned int i
= 0; i
< count
; i
++)
7644 TREE_TYPE (v
[i
]) = eltype
;
7645 layout_decl (v
[i
], 0);
7646 if (processing_template_decl
)
7648 tree t
= unshare_expr (dexp
);
7649 convert_vector_to_array_for_subscript (DECL_SOURCE_LOCATION (v
[i
]),
7651 t
= build4_loc (DECL_SOURCE_LOCATION (v
[i
]), ARRAY_REF
,
7652 eltype
, t
, size_int (i
), NULL_TREE
,
7654 SET_DECL_VALUE_EXPR (v
[i
], t
);
7655 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7658 else if (tree tsize
= get_tuple_size (type
))
7660 if (tsize
== error_mark_node
)
7662 error_at (loc
, "%<std::tuple_size<%T>::value%> is not an integral "
7663 "constant expression", type
);
7666 if (!tree_fits_uhwi_p (tsize
))
7668 error_n (loc
, count
,
7669 "%u name provided for structured binding",
7670 "%u names provided for structured binding", count
);
7671 inform (loc
, "while %qT decomposes into %E elements",
7675 eltscnt
= tree_to_uhwi (tsize
);
7676 if (count
!= eltscnt
)
7678 int save_read
= DECL_READ_P (decl
);
7679 for (unsigned i
= 0; i
< count
; ++i
)
7681 location_t sloc
= input_location
;
7682 location_t dloc
= DECL_SOURCE_LOCATION (v
[i
]);
7684 input_location
= dloc
;
7685 tree init
= get_tuple_decomp_init (decl
, i
);
7686 tree eltype
= (init
== error_mark_node
? error_mark_node
7687 : get_tuple_element_type (type
, i
));
7688 input_location
= sloc
;
7690 if (init
== error_mark_node
|| eltype
== error_mark_node
)
7692 inform (dloc
, "in initialization of structured binding "
7693 "variable %qD", v
[i
]);
7696 /* Save the decltype away before reference collapse. */
7697 store_decomp_type (v
[i
], eltype
);
7698 eltype
= cp_build_reference_type (eltype
, !lvalue_p (init
));
7699 TREE_TYPE (v
[i
]) = eltype
;
7700 layout_decl (v
[i
], 0);
7701 if (DECL_HAS_VALUE_EXPR_P (v
[i
]))
7703 /* In this case the names are variables, not just proxies. */
7704 SET_DECL_VALUE_EXPR (v
[i
], NULL_TREE
);
7705 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 0;
7707 if (!processing_template_decl
)
7708 cp_finish_decl (v
[i
], init
, /*constexpr*/false,
7709 /*asm*/NULL_TREE
, LOOKUP_NORMAL
);
7711 /* Ignore reads from the underlying decl performed during initialization
7712 of the individual variables. If those will be read, we'll mark
7713 the underlying decl as read at that point. */
7714 DECL_READ_P (decl
) = save_read
;
7716 else if (TREE_CODE (type
) == UNION_TYPE
)
7718 error_at (loc
, "cannot decompose union type %qT", type
);
7721 else if (!CLASS_TYPE_P (type
))
7723 error_at (loc
, "cannot decompose non-array non-class type %qT", type
);
7726 else if (LAMBDA_TYPE_P (type
))
7728 error_at (loc
, "cannot decompose lambda closure type %qT", type
);
7733 tree btype
= find_decomp_class_base (loc
, type
, NULL_TREE
);
7734 if (btype
== error_mark_node
)
7736 else if (btype
== NULL_TREE
)
7738 error_at (loc
, "cannot decompose class type %qT without non-static "
7739 "data members", type
);
7742 for (tree field
= TYPE_FIELDS (btype
); field
; field
= TREE_CHAIN (field
))
7743 if (TREE_CODE (field
) != FIELD_DECL
7744 || DECL_ARTIFICIAL (field
)
7745 || DECL_UNNAMED_BIT_FIELD (field
))
7749 if (count
!= eltscnt
)
7754 t
= convert_to_base (t
, btype
, /*check_access*/true,
7755 /*nonnull*/false, tf_warning_or_error
);
7759 for (tree field
= TYPE_FIELDS (btype
); field
; field
= TREE_CHAIN (field
))
7760 if (TREE_CODE (field
) != FIELD_DECL
7761 || DECL_ARTIFICIAL (field
)
7762 || DECL_UNNAMED_BIT_FIELD (field
))
7766 tree tt
= finish_non_static_data_member (field
, unshare_expr (t
),
7768 if (REFERENCE_REF_P (tt
))
7769 tt
= TREE_OPERAND (tt
, 0);
7770 TREE_TYPE (v
[i
]) = TREE_TYPE (tt
);
7771 layout_decl (v
[i
], 0);
7772 if (!processing_template_decl
)
7774 SET_DECL_VALUE_EXPR (v
[i
], tt
);
7775 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7780 if (processing_template_decl
)
7782 for (unsigned int i
= 0; i
< count
; i
++)
7783 if (!DECL_HAS_VALUE_EXPR_P (v
[i
]))
7785 tree a
= build_nt (ARRAY_REF
, decl
, size_int (i
),
7786 NULL_TREE
, NULL_TREE
);
7787 SET_DECL_VALUE_EXPR (v
[i
], a
);
7788 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7793 /* Returns a declaration for a VAR_DECL as if:
7795 extern "C" TYPE NAME;
7797 had been seen. Used to create compiler-generated global
7801 declare_global_var (tree name
, tree type
)
7805 push_to_top_level ();
7806 decl
= build_decl (input_location
, VAR_DECL
, name
, type
);
7807 TREE_PUBLIC (decl
) = 1;
7808 DECL_EXTERNAL (decl
) = 1;
7809 DECL_ARTIFICIAL (decl
) = 1;
7810 DECL_CONTEXT (decl
) = FROB_CONTEXT (global_namespace
);
7811 /* If the user has explicitly declared this variable (perhaps
7812 because the code we are compiling is part of a low-level runtime
7813 library), then it is possible that our declaration will be merged
7814 with theirs by pushdecl. */
7815 decl
= pushdecl (decl
);
7816 cp_finish_decl (decl
, NULL_TREE
, false, NULL_TREE
, 0);
7817 pop_from_top_level ();
7822 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
7823 if "__cxa_atexit" is not being used) corresponding to the function
7824 to be called when the program exits. */
7827 get_atexit_fn_ptr_type (void)
7831 if (!atexit_fn_ptr_type_node
)
7834 if (flag_use_cxa_atexit
7835 && !targetm
.cxx
.use_atexit_for_cxa_atexit ())
7836 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
7837 arg_type
= ptr_type_node
;
7839 /* The parameter to "atexit" is "void (*)(void)". */
7840 arg_type
= NULL_TREE
;
7842 fn_type
= build_function_type_list (void_type_node
,
7843 arg_type
, NULL_TREE
);
7844 atexit_fn_ptr_type_node
= build_pointer_type (fn_type
);
7847 return atexit_fn_ptr_type_node
;
7850 /* Returns a pointer to the `atexit' function. Note that if
7851 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
7852 `__cxa_atexit' function specified in the IA64 C++ ABI. */
7855 get_atexit_node (void)
7861 bool use_aeabi_atexit
;
7866 if (flag_use_cxa_atexit
&& !targetm
.cxx
.use_atexit_for_cxa_atexit ())
7868 /* The declaration for `__cxa_atexit' is:
7870 int __cxa_atexit (void (*)(void *), void *, void *)
7872 We build up the argument types and then the function type
7874 tree argtype0
, argtype1
, argtype2
;
7876 use_aeabi_atexit
= targetm
.cxx
.use_aeabi_atexit ();
7877 /* First, build the pointer-to-function type for the first
7879 fn_ptr_type
= get_atexit_fn_ptr_type ();
7880 /* Then, build the rest of the argument types. */
7881 argtype2
= ptr_type_node
;
7882 if (use_aeabi_atexit
)
7884 argtype1
= fn_ptr_type
;
7885 argtype0
= ptr_type_node
;
7889 argtype1
= ptr_type_node
;
7890 argtype0
= fn_ptr_type
;
7892 /* And the final __cxa_atexit type. */
7893 fn_type
= build_function_type_list (integer_type_node
,
7894 argtype0
, argtype1
, argtype2
,
7896 if (use_aeabi_atexit
)
7897 name
= "__aeabi_atexit";
7899 name
= "__cxa_atexit";
7903 /* The declaration for `atexit' is:
7905 int atexit (void (*)());
7907 We build up the argument types and then the function type
7909 fn_ptr_type
= get_atexit_fn_ptr_type ();
7910 /* Build the final atexit type. */
7911 fn_type
= build_function_type_list (integer_type_node
,
7912 fn_ptr_type
, NULL_TREE
);
7916 /* Now, build the function declaration. */
7917 push_lang_context (lang_name_c
);
7918 atexit_fndecl
= build_library_fn_ptr (name
, fn_type
, ECF_LEAF
| ECF_NOTHROW
);
7919 mark_used (atexit_fndecl
);
7920 pop_lang_context ();
7921 atexit_node
= decay_conversion (atexit_fndecl
, tf_warning_or_error
);
7926 /* Like get_atexit_node, but for thread-local cleanups. */
7929 get_thread_atexit_node (void)
7931 /* The declaration for `__cxa_thread_atexit' is:
7933 int __cxa_thread_atexit (void (*)(void *), void *, void *) */
7934 tree fn_type
= build_function_type_list (integer_type_node
,
7935 get_atexit_fn_ptr_type (),
7936 ptr_type_node
, ptr_type_node
,
7939 /* Now, build the function declaration. */
7940 tree atexit_fndecl
= build_library_fn_ptr ("__cxa_thread_atexit", fn_type
,
7941 ECF_LEAF
| ECF_NOTHROW
);
7942 return decay_conversion (atexit_fndecl
, tf_warning_or_error
);
7945 /* Returns the __dso_handle VAR_DECL. */
7948 get_dso_handle_node (void)
7950 if (dso_handle_node
)
7951 return dso_handle_node
;
7953 /* Declare the variable. */
7954 dso_handle_node
= declare_global_var (get_identifier ("__dso_handle"),
7957 #ifdef HAVE_GAS_HIDDEN
7958 if (dso_handle_node
!= error_mark_node
)
7960 DECL_VISIBILITY (dso_handle_node
) = VISIBILITY_HIDDEN
;
7961 DECL_VISIBILITY_SPECIFIED (dso_handle_node
) = 1;
7965 return dso_handle_node
;
7968 /* Begin a new function with internal linkage whose job will be simply
7969 to destroy some particular variable. */
7971 static GTY(()) int start_cleanup_cnt
;
7974 start_cleanup_fn (void)
7979 bool use_cxa_atexit
= flag_use_cxa_atexit
7980 && !targetm
.cxx
.use_atexit_for_cxa_atexit ();
7982 push_to_top_level ();
7984 /* No need to mangle this. */
7985 push_lang_context (lang_name_c
);
7987 /* Build the name of the function. */
7988 sprintf (name
, "__tcf_%d", start_cleanup_cnt
++);
7989 /* Build the function declaration. */
7990 fntype
= TREE_TYPE (get_atexit_fn_ptr_type ());
7991 fndecl
= build_lang_decl (FUNCTION_DECL
, get_identifier (name
), fntype
);
7992 /* It's a function with internal linkage, generated by the
7994 TREE_PUBLIC (fndecl
) = 0;
7995 DECL_ARTIFICIAL (fndecl
) = 1;
7996 /* Make the function `inline' so that it is only emitted if it is
7997 actually needed. It is unlikely that it will be inlined, since
7998 it is only called via a function pointer, but we avoid unnecessary
7999 emissions this way. */
8000 DECL_DECLARED_INLINE_P (fndecl
) = 1;
8001 DECL_INTERFACE_KNOWN (fndecl
) = 1;
8002 /* Build the parameter. */
8005 tree parmdecl
= cp_build_parm_decl (fndecl
, NULL_TREE
, ptr_type_node
);
8006 TREE_USED (parmdecl
) = 1;
8007 DECL_READ_P (parmdecl
) = 1;
8008 DECL_ARGUMENTS (fndecl
) = parmdecl
;
8012 start_preparsed_function (fndecl
, NULL_TREE
, SF_PRE_PARSED
);
8014 pop_lang_context ();
8016 return current_function_decl
;
8019 /* Finish the cleanup function begun by start_cleanup_fn. */
8022 end_cleanup_fn (void)
8024 expand_or_defer_fn (finish_function (/*inline_p=*/false));
8026 pop_from_top_level ();
8029 /* Generate code to handle the destruction of DECL, an object with
8030 static storage duration. */
8033 register_dtor_fn (tree decl
)
8040 bool ob_parm
, dso_parm
, use_dtor
;
8041 tree arg0
, arg1
, arg2
;
8044 type
= TREE_TYPE (decl
);
8045 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type
))
8048 /* If we're using "__cxa_atexit" (or "__cxa_thread_atexit" or
8049 "__aeabi_atexit"), and DECL is a class object, we can just pass the
8050 destructor to "__cxa_atexit"; we don't have to build a temporary
8051 function to do the cleanup. */
8052 dso_parm
= (flag_use_cxa_atexit
8053 && !targetm
.cxx
.use_atexit_for_cxa_atexit ());
8054 ob_parm
= (CP_DECL_THREAD_LOCAL_P (decl
) || dso_parm
);
8055 use_dtor
= ob_parm
&& CLASS_TYPE_P (type
);
8058 cleanup
= get_class_binding (type
, complete_dtor_identifier
);
8060 /* Make sure it is accessible. */
8061 perform_or_defer_access_check (TYPE_BINFO (type
), cleanup
, cleanup
,
8062 tf_warning_or_error
);
8066 /* Call build_cleanup before we enter the anonymous function so
8067 that any access checks will be done relative to the current
8068 scope, rather than the scope of the anonymous function. */
8069 build_cleanup (decl
);
8071 /* Now start the function. */
8072 cleanup
= start_cleanup_fn ();
8074 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
8075 to the original function, rather than the anonymous one. That
8076 will make the back end think that nested functions are in use,
8077 which causes confusion. */
8078 push_deferring_access_checks (dk_no_check
);
8079 fcall
= build_cleanup (decl
);
8080 pop_deferring_access_checks ();
8082 /* Create the body of the anonymous function. */
8083 compound_stmt
= begin_compound_stmt (BCS_FN_BODY
);
8084 finish_expr_stmt (fcall
);
8085 finish_compound_stmt (compound_stmt
);
8089 /* Call atexit with the cleanup function. */
8090 mark_used (cleanup
);
8091 cleanup
= build_address (cleanup
);
8093 if (CP_DECL_THREAD_LOCAL_P (decl
))
8094 atex_node
= get_thread_atexit_node ();
8096 atex_node
= get_atexit_node ();
8100 /* We must convert CLEANUP to the type that "__cxa_atexit"
8102 cleanup
= build_nop (get_atexit_fn_ptr_type (), cleanup
);
8103 /* "__cxa_atexit" will pass the address of DECL to the
8104 cleanup function. */
8106 addr
= build_address (decl
);
8107 /* The declared type of the parameter to "__cxa_atexit" is
8108 "void *". For plain "T*", we could just let the
8109 machinery in cp_build_function_call convert it -- but if the
8110 type is "cv-qualified T *", then we need to convert it
8111 before passing it in, to avoid spurious errors. */
8112 addr
= build_nop (ptr_type_node
, addr
);
8115 /* Since the cleanup functions we build ignore the address
8116 they're given, there's no reason to pass the actual address
8117 in, and, in general, it's cheaper to pass NULL than any
8119 addr
= null_pointer_node
;
8122 arg2
= cp_build_addr_expr (get_dso_handle_node (),
8123 tf_warning_or_error
);
8125 /* Just pass NULL to the dso handle parm if we don't actually
8126 have a DSO handle on this target. */
8127 arg2
= null_pointer_node
;
8133 if (!CP_DECL_THREAD_LOCAL_P (decl
)
8134 && targetm
.cxx
.use_aeabi_atexit ())
8150 return cp_build_function_call_nary (atex_node
, tf_warning_or_error
,
8151 arg0
, arg1
, arg2
, NULL_TREE
);
8154 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
8155 is its initializer. Generate code to handle the construction
8156 and destruction of DECL. */
8159 expand_static_init (tree decl
, tree init
)
8161 gcc_assert (VAR_P (decl
));
8162 gcc_assert (TREE_STATIC (decl
));
8164 /* Some variables require no dynamic initialization. */
8165 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl
)))
8167 /* Make sure the destructor is callable. */
8168 cxx_maybe_build_cleanup (decl
, tf_warning_or_error
);
8173 if (CP_DECL_THREAD_LOCAL_P (decl
) && DECL_GNU_TLS_P (decl
)
8174 && !DECL_FUNCTION_SCOPE_P (decl
))
8177 error ("non-local variable %qD declared %<__thread%> "
8178 "needs dynamic initialization", decl
);
8180 error ("non-local variable %qD declared %<__thread%> "
8181 "has a non-trivial destructor", decl
);
8182 static bool informed
;
8185 inform (DECL_SOURCE_LOCATION (decl
),
8186 "C++11 %<thread_local%> allows dynamic initialization "
8193 if (DECL_FUNCTION_SCOPE_P (decl
))
8195 /* Emit code to perform this initialization but once. */
8196 tree if_stmt
= NULL_TREE
, inner_if_stmt
= NULL_TREE
;
8197 tree then_clause
= NULL_TREE
, inner_then_clause
= NULL_TREE
;
8198 tree guard
, guard_addr
;
8200 /* We don't need thread-safety code for thread-local vars. */
8201 bool thread_guard
= (flag_threadsafe_statics
8202 && !CP_DECL_THREAD_LOCAL_P (decl
));
8204 /* Emit code to perform this initialization but once. This code
8207 static <type> guard;
8208 if (!__atomic_load (guard.first_byte)) {
8209 if (__cxa_guard_acquire (&guard)) {
8212 // Do initialization.
8213 flag = true; __cxa_guard_release (&guard);
8214 // Register variable for destruction at end of program.
8216 if (!flag) __cxa_guard_abort (&guard);
8221 Note that the `flag' variable is only set to 1 *after* the
8222 initialization is complete. This ensures that an exception,
8223 thrown during the construction, will cause the variable to
8224 reinitialized when we pass through this code again, as per:
8228 If the initialization exits by throwing an exception, the
8229 initialization is not complete, so it will be tried again
8230 the next time control enters the declaration.
8232 This process should be thread-safe, too; multiple threads
8233 should not be able to initialize the variable more than
8236 /* Create the guard variable. */
8237 guard
= get_guard (decl
);
8239 /* Begin the conditional initialization. */
8240 if_stmt
= begin_if_stmt ();
8242 finish_if_stmt_cond (get_guard_cond (guard
, thread_guard
), if_stmt
);
8243 then_clause
= begin_compound_stmt (BCS_NO_SCOPE
);
8247 tree vfntype
= NULL_TREE
;
8248 tree acquire_name
, release_name
, abort_name
;
8249 tree acquire_fn
, release_fn
, abort_fn
;
8250 guard_addr
= build_address (guard
);
8252 acquire_name
= get_identifier ("__cxa_guard_acquire");
8253 release_name
= get_identifier ("__cxa_guard_release");
8254 abort_name
= get_identifier ("__cxa_guard_abort");
8255 acquire_fn
= get_global_binding (acquire_name
);
8256 release_fn
= get_global_binding (release_name
);
8257 abort_fn
= get_global_binding (abort_name
);
8259 acquire_fn
= push_library_fn
8260 (acquire_name
, build_function_type_list (integer_type_node
,
8261 TREE_TYPE (guard_addr
),
8263 NULL_TREE
, ECF_NOTHROW
| ECF_LEAF
);
8264 if (!release_fn
|| !abort_fn
)
8265 vfntype
= build_function_type_list (void_type_node
,
8266 TREE_TYPE (guard_addr
),
8269 release_fn
= push_library_fn (release_name
, vfntype
, NULL_TREE
,
8270 ECF_NOTHROW
| ECF_LEAF
);
8272 abort_fn
= push_library_fn (abort_name
, vfntype
, NULL_TREE
,
8273 ECF_NOTHROW
| ECF_LEAF
);
8275 inner_if_stmt
= begin_if_stmt ();
8276 finish_if_stmt_cond (build_call_n (acquire_fn
, 1, guard_addr
),
8279 inner_then_clause
= begin_compound_stmt (BCS_NO_SCOPE
);
8280 begin
= get_target_expr (boolean_false_node
);
8281 flag
= TARGET_EXPR_SLOT (begin
);
8283 TARGET_EXPR_CLEANUP (begin
)
8284 = build3 (COND_EXPR
, void_type_node
, flag
,
8286 build_call_n (abort_fn
, 1, guard_addr
));
8287 CLEANUP_EH_ONLY (begin
) = 1;
8289 /* Do the initialization itself. */
8290 init
= add_stmt_to_compound (begin
, init
);
8291 init
= add_stmt_to_compound
8292 (init
, build2 (MODIFY_EXPR
, void_type_node
, flag
, boolean_true_node
));
8293 init
= add_stmt_to_compound
8294 (init
, build_call_n (release_fn
, 1, guard_addr
));
8297 init
= add_stmt_to_compound (init
, set_guard (guard
));
8299 /* Use atexit to register a function for destroying this static
8301 init
= add_stmt_to_compound (init
, register_dtor_fn (decl
));
8303 finish_expr_stmt (init
);
8307 finish_compound_stmt (inner_then_clause
);
8308 finish_then_clause (inner_if_stmt
);
8309 finish_if_stmt (inner_if_stmt
);
8312 finish_compound_stmt (then_clause
);
8313 finish_then_clause (if_stmt
);
8314 finish_if_stmt (if_stmt
);
8316 else if (CP_DECL_THREAD_LOCAL_P (decl
))
8317 tls_aggregates
= tree_cons (init
, decl
, tls_aggregates
);
8319 static_aggregates
= tree_cons (init
, decl
, static_aggregates
);
8323 /* Make TYPE a complete type based on INITIAL_VALUE.
8324 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
8325 2 if there was no information (in which case assume 0 if DO_DEFAULT),
8326 3 if the initializer list is empty (in pedantic mode). */
8329 cp_complete_array_type (tree
*ptype
, tree initial_value
, bool do_default
)
8332 tree type
, elt_type
;
8334 /* Don't get confused by a CONSTRUCTOR for some other type. */
8335 if (initial_value
&& TREE_CODE (initial_value
) == CONSTRUCTOR
8336 && !BRACE_ENCLOSED_INITIALIZER_P (initial_value
)
8337 && TREE_CODE (TREE_TYPE (initial_value
)) != ARRAY_TYPE
)
8342 unsigned HOST_WIDE_INT i
;
8345 /* An array of character type can be initialized from a
8346 brace-enclosed string constant.
8348 FIXME: this code is duplicated from reshape_init. Probably
8349 we should just call reshape_init here? */
8350 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype
)))
8351 && TREE_CODE (initial_value
) == CONSTRUCTOR
8352 && !vec_safe_is_empty (CONSTRUCTOR_ELTS (initial_value
)))
8354 vec
<constructor_elt
, va_gc
> *v
= CONSTRUCTOR_ELTS (initial_value
);
8355 tree value
= (*v
)[0].value
;
8357 if (TREE_CODE (value
) == STRING_CST
8358 && v
->length () == 1)
8359 initial_value
= value
;
8362 /* If any of the elements are parameter packs, we can't actually
8363 complete this type now because the array size is dependent. */
8364 if (TREE_CODE (initial_value
) == CONSTRUCTOR
)
8366 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value
),
8369 if (PACK_EXPANSION_P (value
))
8375 failure
= complete_array_type (ptype
, initial_value
, do_default
);
8377 /* We can create the array before the element type is complete, which
8378 means that we didn't have these two bits set in the original type
8379 either. In completing the type, we are expected to propagate these
8380 bits. See also complete_type which does the same thing for arrays
8383 if (type
!= error_mark_node
&& TYPE_DOMAIN (type
))
8385 elt_type
= TREE_TYPE (type
);
8386 TYPE_NEEDS_CONSTRUCTING (type
) = TYPE_NEEDS_CONSTRUCTING (elt_type
);
8387 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
)
8388 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type
);
8394 /* As above, but either give an error or reject zero-size arrays, depending
8398 cp_complete_array_type_or_error (tree
*ptype
, tree initial_value
,
8399 bool do_default
, tsubst_flags_t complain
)
8402 bool sfinae
= !(complain
& tf_error
);
8403 /* In SFINAE context we can't be lenient about zero-size arrays. */
8406 failure
= cp_complete_array_type (ptype
, initial_value
, do_default
);
8412 /* Not an error. */;
8413 else if (failure
== 1)
8414 error ("initializer fails to determine size of %qT", *ptype
);
8415 else if (failure
== 2)
8418 error ("array size missing in %qT", *ptype
);
8420 else if (failure
== 3)
8421 error ("zero-size array %qT", *ptype
);
8422 *ptype
= error_mark_node
;
8427 /* Return zero if something is declared to be a member of type
8428 CTYPE when in the context of CUR_TYPE. STRING is the error
8429 message to print in that case. Otherwise, quietly return 1. */
8432 member_function_or_else (tree ctype
, tree cur_type
, enum overload_flags flags
)
8434 if (ctype
&& ctype
!= cur_type
)
8436 if (flags
== DTOR_FLAG
)
8437 error ("destructor for alien class %qT cannot be a member", ctype
);
8439 error ("constructor for alien class %qT cannot be a member", ctype
);
8445 /* Subroutine of `grokdeclarator'. */
8447 /* Generate errors possibly applicable for a given set of specifiers.
8448 This is for ARM $7.1.2. */
8451 bad_specifiers (tree object
,
8452 enum bad_spec_place type
,
8463 error ("%qD declared as a %<virtual%> variable", object
);
8465 error ("%<const%> and %<volatile%> function specifiers on "
8466 "%qD invalid in variable declaration", object
);
8470 error ("%qD declared as a %<virtual%> parameter", object
);
8472 error ("%qD declared as an %<inline%> parameter", object
);
8474 error ("%<const%> and %<volatile%> function specifiers on "
8475 "%qD invalid in parameter declaration", object
);
8479 error ("%qD declared as a %<virtual%> type", object
);
8481 error ("%qD declared as an %<inline%> type", object
);
8483 error ("%<const%> and %<volatile%> function specifiers on "
8484 "%qD invalid in type declaration", object
);
8488 error ("%qD declared as a %<virtual%> field", object
);
8490 error ("%qD declared as an %<inline%> field", object
);
8492 error ("%<const%> and %<volatile%> function specifiers on "
8493 "%qD invalid in field declaration", object
);
8499 error ("%q+D declared as a friend", object
);
8501 && !flag_noexcept_type
8502 && (TREE_CODE (object
) == TYPE_DECL
8503 || (!TYPE_PTRFN_P (TREE_TYPE (object
))
8504 && !TYPE_REFFN_P (TREE_TYPE (object
))
8505 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object
)))))
8506 error ("%q+D declared with an exception specification", object
);
8509 /* DECL is a member function or static data member and is presently
8510 being defined. Check that the definition is taking place in a
8514 check_class_member_definition_namespace (tree decl
)
8516 /* These checks only apply to member functions and static data
8518 gcc_assert (VAR_OR_FUNCTION_DECL_P (decl
));
8519 /* We check for problems with specializations in pt.c in
8520 check_specialization_namespace, where we can issue better
8522 if (processing_specialization
)
8524 /* We check this in check_explicit_instantiation_namespace. */
8525 if (processing_explicit_instantiation
)
8529 A member function definition that appears outside of the
8530 class definition shall appear in a namespace scope enclosing
8531 the class definition.
8535 The definition for a static data member shall appear in a
8536 namespace scope enclosing the member's class definition. */
8537 if (!is_ancestor (current_namespace
, DECL_CONTEXT (decl
)))
8538 permerror (input_location
, "definition of %qD is not in namespace enclosing %qT",
8539 decl
, DECL_CONTEXT (decl
));
8542 /* Build a PARM_DECL for the "this" parameter of FN. TYPE is the
8543 METHOD_TYPE for a non-static member function; QUALS are the
8544 cv-qualifiers that apply to the function. */
8547 build_this_parm (tree fn
, tree type
, cp_cv_quals quals
)
8552 cp_cv_quals this_quals
;
8554 if (CLASS_TYPE_P (type
))
8557 = cp_build_qualified_type (type
, quals
& ~TYPE_QUAL_RESTRICT
);
8558 this_type
= build_pointer_type (this_type
);
8561 this_type
= type_of_this_parm (type
);
8562 /* The `this' parameter is implicitly `const'; it cannot be
8564 this_quals
= (quals
& TYPE_QUAL_RESTRICT
) | TYPE_QUAL_CONST
;
8565 qual_type
= cp_build_qualified_type (this_type
, this_quals
);
8566 parm
= build_artificial_parm (fn
, this_identifier
, qual_type
);
8567 cp_apply_type_quals_to_decl (this_quals
, parm
);
8571 /* DECL is a static member function. Complain if it was declared
8572 with function-cv-quals. */
8575 check_static_quals (tree decl
, cp_cv_quals quals
)
8577 if (quals
!= TYPE_UNQUALIFIED
)
8578 error ("static member function %q#D declared with type qualifiers",
8582 // Check that FN takes no arguments and returns bool.
8584 check_concept_fn (tree fn
)
8586 // A constraint is nullary.
8587 if (DECL_ARGUMENTS (fn
))
8588 error ("concept %q#D declared with function parameters", fn
);
8590 // The declared return type of the concept shall be bool, and
8591 // it shall not be deduced from it definition.
8592 tree type
= TREE_TYPE (TREE_TYPE (fn
));
8594 error ("concept %q#D declared with a deduced return type", fn
);
8595 else if (type
!= boolean_type_node
)
8596 error ("concept %q#D with non-%<bool%> return type %qT", fn
, type
);
8599 /* Helper function. Replace the temporary this parameter injected
8600 during cp_finish_omp_declare_simd with the real this parameter. */
8603 declare_simd_adjust_this (tree
*tp
, int *walk_subtrees
, void *data
)
8605 tree this_parm
= (tree
) data
;
8606 if (TREE_CODE (*tp
) == PARM_DECL
8607 && DECL_NAME (*tp
) == this_identifier
8608 && *tp
!= this_parm
)
8610 else if (TYPE_P (*tp
))
8615 /* CTYPE is class type, or null if non-class.
8616 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
8618 DECLARATOR is the function's name.
8619 PARMS is a chain of PARM_DECLs for the function.
8620 VIRTUALP is truthvalue of whether the function is virtual or not.
8621 FLAGS are to be passed through to `grokclassfn'.
8622 QUALS are qualifiers indicating whether the function is `const'
8624 RAISES is a list of exceptions that this function can raise.
8625 CHECK is 1 if we must find this method in CTYPE, 0 if we should
8626 not look, and -1 if we should not call `grokclassfn' at all.
8628 SFK is the kind of special function (if any) for the new function.
8630 Returns `NULL_TREE' if something goes wrong, after issuing
8631 applicable error messages. */
8634 grokfndecl (tree ctype
,
8638 tree orig_declarator
,
8641 enum overload_flags flags
,
8643 cp_ref_qualifier rqual
,
8650 special_function_kind sfk
,
8655 location_t location
)
8658 int staticp
= ctype
&& TREE_CODE (type
) == FUNCTION_TYPE
;
8661 // Was the concept specifier present?
8662 bool concept_p
= inlinep
& 4;
8664 // Concept declarations must have a corresponding definition.
8665 if (concept_p
&& !funcdef_flag
)
8667 error ("concept %qD has no definition", declarator
);
8672 type
= build_ref_qualified_type (type
, rqual
);
8674 type
= build_exception_variant (type
, raises
);
8676 decl
= build_lang_decl (FUNCTION_DECL
, declarator
, type
);
8678 /* Set the constraints on the declaration. */
8681 tree tmpl_reqs
= NULL_TREE
;
8682 if (processing_template_decl
> template_class_depth (ctype
))
8683 tmpl_reqs
= TEMPLATE_PARMS_CONSTRAINTS (current_template_parms
);
8685 /* Adjust the required expression into a constraint. */
8687 decl_reqs
= normalize_expression (decl_reqs
);
8689 tree ci
= build_constraints (tmpl_reqs
, decl_reqs
);
8690 set_constraints (decl
, ci
);
8693 /* If we have an explicit location, use it, otherwise use whatever
8694 build_lang_decl used (probably input_location). */
8695 if (location
!= UNKNOWN_LOCATION
)
8696 DECL_SOURCE_LOCATION (decl
) = location
;
8698 if (TREE_CODE (type
) == METHOD_TYPE
)
8700 tree parm
= build_this_parm (decl
, type
, quals
);
8701 DECL_CHAIN (parm
) = parms
;
8704 /* Allocate space to hold the vptr bit if needed. */
8705 SET_DECL_ALIGN (decl
, MINIMUM_METHOD_BOUNDARY
);
8708 DECL_ARGUMENTS (decl
) = parms
;
8709 for (t
= parms
; t
; t
= DECL_CHAIN (t
))
8710 DECL_CONTEXT (t
) = decl
;
8712 /* Propagate volatile out from type to decl. */
8713 if (TYPE_VOLATILE (type
))
8714 TREE_THIS_VOLATILE (decl
) = 1;
8716 /* Setup decl according to sfk. */
8719 case sfk_constructor
:
8720 case sfk_copy_constructor
:
8721 case sfk_move_constructor
:
8722 DECL_CXX_CONSTRUCTOR_P (decl
) = 1;
8723 DECL_NAME (decl
) = ctor_identifier
;
8725 case sfk_destructor
:
8726 DECL_CXX_DESTRUCTOR_P (decl
) = 1;
8727 DECL_NAME (decl
) = dtor_identifier
;
8733 if (friendp
&& TREE_CODE (orig_declarator
) == TEMPLATE_ID_EXPR
)
8736 error ("defining explicit specialization %qD in friend declaration",
8740 tree fns
= TREE_OPERAND (orig_declarator
, 0);
8741 tree args
= TREE_OPERAND (orig_declarator
, 1);
8743 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
8745 /* Something like `template <class T> friend void f<T>()'. */
8746 error ("invalid use of template-id %qD in declaration "
8747 "of primary template",
8753 /* A friend declaration of the form friend void f<>(). Record
8754 the information in the TEMPLATE_ID_EXPR. */
8755 SET_DECL_IMPLICIT_INSTANTIATION (decl
);
8757 gcc_assert (identifier_p (fns
) || TREE_CODE (fns
) == OVERLOAD
);
8758 DECL_TEMPLATE_INFO (decl
) = build_template_info (fns
, args
);
8760 for (t
= TYPE_ARG_TYPES (TREE_TYPE (decl
)); t
; t
= TREE_CHAIN (t
))
8761 if (TREE_PURPOSE (t
)
8762 && TREE_CODE (TREE_PURPOSE (t
)) == DEFAULT_ARG
)
8764 error ("default arguments are not allowed in declaration "
8765 "of friend template specialization %qD",
8772 error ("%<inline%> is not allowed in declaration of friend "
8773 "template specialization %qD",
8780 /* If this decl has namespace scope, set that up. */
8782 set_decl_namespace (decl
, in_namespace
, friendp
);
8784 DECL_CONTEXT (decl
) = FROB_CONTEXT (current_decl_namespace ());
8786 /* `main' and builtins have implicit 'C' linkage. */
8787 if (ctype
== NULL_TREE
8788 && DECL_FILE_SCOPE_P (decl
)
8789 && current_lang_name
== lang_name_cplusplus
8790 && (MAIN_NAME_P (declarator
)
8791 || (IDENTIFIER_LENGTH (declarator
) > 10
8792 && IDENTIFIER_POINTER (declarator
)[0] == '_'
8793 && IDENTIFIER_POINTER (declarator
)[1] == '_'
8794 && strncmp (IDENTIFIER_POINTER (declarator
)+2,
8795 "builtin_", 8) == 0)
8796 || (targetcm
.cxx_implicit_extern_c
8797 && (targetcm
.cxx_implicit_extern_c
8798 (IDENTIFIER_POINTER (declarator
))))))
8799 SET_DECL_LANGUAGE (decl
, lang_c
);
8801 /* Should probably propagate const out from type to decl I bet (mrs). */
8804 DECL_STATIC_FUNCTION_P (decl
) = 1;
8805 DECL_CONTEXT (decl
) = ctype
;
8809 DECL_DELETED_FN (decl
) = 1;
8813 DECL_CONTEXT (decl
) = ctype
;
8815 check_class_member_definition_namespace (decl
);
8818 if (ctype
== NULL_TREE
&& DECL_MAIN_P (decl
))
8820 if (PROCESSING_REAL_TEMPLATE_DECL_P())
8821 error ("cannot declare %<::main%> to be a template");
8823 error ("cannot declare %<::main%> to be inline");
8825 error ("cannot declare %<::main%> to be %<constexpr%>");
8827 error ("cannot declare %<::main%> to be static");
8832 /* Members of anonymous types and local classes have no linkage; make
8833 them internal. If a typedef is made later, this will be changed. */
8834 if (ctype
&& (!TREE_PUBLIC (TYPE_MAIN_DECL (ctype
))
8835 || decl_function_context (TYPE_MAIN_DECL (ctype
))))
8838 if (publicp
&& cxx_dialect
== cxx98
)
8840 /* [basic.link]: A name with no linkage (notably, the name of a class
8841 or enumeration declared in a local scope) shall not be used to
8842 declare an entity with linkage.
8844 DR 757 relaxes this restriction for C++0x. */
8845 no_linkage_error (decl
);
8848 TREE_PUBLIC (decl
) = publicp
;
8851 DECL_INTERFACE_KNOWN (decl
) = 1;
8852 DECL_NOT_REALLY_EXTERN (decl
) = 1;
8855 /* If the declaration was declared inline, mark it as such. */
8858 DECL_DECLARED_INLINE_P (decl
) = 1;
8860 DECL_COMDAT (decl
) = 1;
8863 DECL_DECLARED_CONSTEXPR_P (decl
) = true;
8865 // If the concept declaration specifier was found, check
8866 // that the declaration satisfies the necessary requirements.
8869 DECL_DECLARED_CONCEPT_P (decl
) = true;
8870 check_concept_fn (decl
);
8873 DECL_EXTERNAL (decl
) = 1;
8874 if (TREE_CODE (type
) == FUNCTION_TYPE
)
8877 TREE_TYPE (decl
) = apply_memfn_quals (TREE_TYPE (decl
),
8884 ? G_("static member function %qD cannot have cv-qualifier")
8885 : G_("non-member function %qD cannot have cv-qualifier"),
8887 quals
= TYPE_UNQUALIFIED
;
8893 ? G_("static member function %qD cannot have ref-qualifier")
8894 : G_("non-member function %qD cannot have ref-qualifier"),
8896 rqual
= REF_QUAL_NONE
;
8900 if (deduction_guide_p (decl
))
8902 if (!DECL_NAMESPACE_SCOPE_P (decl
))
8904 error_at (location
, "deduction guide %qD must be declared at "
8905 "namespace scope", decl
);
8910 "deduction guide %qD must not have a function body", decl
);
8912 else if (IDENTIFIER_ANY_OP_P (DECL_NAME (decl
))
8913 && !grok_op_properties (decl
, /*complain=*/true))
8915 else if (UDLIT_OPER_P (DECL_NAME (decl
)))
8917 bool long_long_unsigned_p
;
8919 const char *suffix
= NULL
;
8920 /* [over.literal]/6: Literal operators shall not have C linkage. */
8921 if (DECL_LANGUAGE (decl
) == lang_c
)
8923 error ("literal operator with C linkage");
8924 maybe_show_extern_c_location ();
8928 if (DECL_NAMESPACE_SCOPE_P (decl
))
8930 if (!check_literal_operator_args (decl
, &long_long_unsigned_p
,
8933 error ("%qD has invalid argument list", decl
);
8937 suffix
= UDLIT_OP_SUFFIX (DECL_NAME (decl
));
8938 if (long_long_unsigned_p
)
8940 if (cpp_interpret_int_suffix (parse_in
, suffix
, strlen (suffix
)))
8941 warning (0, "integer suffix %qs"
8942 " shadowed by implementation", suffix
);
8944 else if (long_double_p
)
8946 if (cpp_interpret_float_suffix (parse_in
, suffix
, strlen (suffix
)))
8947 warning (0, "floating point suffix %qs"
8948 " shadowed by implementation", suffix
);
8951 if (suffix
[0] != '_'
8952 && !in_system_header_at (DECL_SOURCE_LOCATION (decl
))
8953 && !current_function_decl
&& !(friendp
&& !funcdef_flag
))
8954 warning (OPT_Wliteral_suffix
,
8955 "literal operator suffixes not preceded by %<_%>"
8956 " are reserved for future standardization");
8960 error ("%qD must be a non-member function", decl
);
8966 /* Make the init_value nonzero so pushdecl knows this is not
8967 tentative. error_mark_node is replaced later with the BLOCK. */
8968 DECL_INITIAL (decl
) = error_mark_node
;
8970 if (TYPE_NOTHROW_P (type
) || nothrow_libfn_p (decl
))
8971 TREE_NOTHROW (decl
) = 1;
8973 if (flag_openmp
|| flag_openmp_simd
)
8975 /* Adjust "omp declare simd" attributes. */
8976 tree ods
= lookup_attribute ("omp declare simd", *attrlist
);
8980 for (attr
= ods
; attr
;
8981 attr
= lookup_attribute ("omp declare simd", TREE_CHAIN (attr
)))
8983 if (TREE_CODE (type
) == METHOD_TYPE
)
8984 walk_tree (&TREE_VALUE (attr
), declare_simd_adjust_this
,
8985 DECL_ARGUMENTS (decl
), NULL
);
8986 if (TREE_VALUE (attr
) != NULL_TREE
)
8988 tree cl
= TREE_VALUE (TREE_VALUE (attr
));
8989 cl
= c_omp_declare_simd_clauses_to_numbers
8990 (DECL_ARGUMENTS (decl
), cl
);
8992 TREE_VALUE (TREE_VALUE (attr
)) = cl
;
8994 TREE_VALUE (attr
) = NULL_TREE
;
9000 /* Caller will do the rest of this. */
9004 if (ctype
!= NULL_TREE
)
9005 grokclassfn (ctype
, decl
, flags
);
9008 if (cxx_dialect
>= cxx11
9009 && DECL_DESTRUCTOR_P (decl
)
9010 && !TYPE_BEING_DEFINED (DECL_CONTEXT (decl
))
9011 && !processing_template_decl
)
9012 deduce_noexcept_on_destructor (decl
);
9014 decl
= check_explicit_specialization (orig_declarator
, decl
,
9017 4 * (friendp
!= 0) +
9020 if (decl
== error_mark_node
)
9023 if (DECL_STATIC_FUNCTION_P (decl
))
9024 check_static_quals (decl
, quals
);
9028 cplus_decl_attributes (&decl
, *attrlist
, 0);
9029 *attrlist
= NULL_TREE
;
9032 /* Check main's type after attributes have been applied. */
9033 if (ctype
== NULL_TREE
&& DECL_MAIN_P (decl
))
9035 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl
)),
9038 tree oldtypeargs
= TYPE_ARG_TYPES (TREE_TYPE (decl
));
9040 error ("%<::main%> must return %<int%>");
9041 newtype
= build_function_type (integer_type_node
, oldtypeargs
);
9042 TREE_TYPE (decl
) = newtype
;
9045 check_main_parameter_types (decl
);
9048 if (ctype
!= NULL_TREE
&& check
)
9050 tree old_decl
= check_classfn (ctype
, decl
,
9051 (processing_template_decl
9052 > template_class_depth (ctype
))
9053 ? current_template_parms
9056 if (old_decl
== error_mark_node
)
9064 if (TREE_CODE (old_decl
) == TEMPLATE_DECL
)
9065 /* Because grokfndecl is always supposed to return a
9066 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
9067 here. We depend on our callers to figure out that its
9068 really a template that's being returned. */
9069 old_decl
= DECL_TEMPLATE_RESULT (old_decl
);
9071 if (DECL_STATIC_FUNCTION_P (old_decl
)
9072 && TREE_CODE (TREE_TYPE (decl
)) == METHOD_TYPE
)
9074 /* Remove the `this' parm added by grokclassfn. */
9075 revert_static_member_fn (decl
);
9076 check_static_quals (decl
, quals
);
9078 if (DECL_ARTIFICIAL (old_decl
))
9080 error ("definition of implicitly-declared %qD", old_decl
);
9083 else if (DECL_DEFAULTED_FN (old_decl
))
9085 error ("definition of explicitly-defaulted %q+D", decl
);
9086 inform (DECL_SOURCE_LOCATION (old_decl
),
9087 "%q#D explicitly defaulted here", old_decl
);
9091 /* Since we've smashed OLD_DECL to its
9092 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
9093 if (TREE_CODE (decl
) == TEMPLATE_DECL
)
9094 decl
= DECL_TEMPLATE_RESULT (decl
);
9096 /* Attempt to merge the declarations. This can fail, in
9097 the case of some invalid specialization declarations. */
9098 pushed_scope
= push_scope (ctype
);
9099 ok
= duplicate_decls (decl
, old_decl
, friendp
);
9101 pop_scope (pushed_scope
);
9104 error ("no %q#D member function declared in class %qT",
9108 if (ok
== error_mark_node
)
9114 if (DECL_CONSTRUCTOR_P (decl
) && !grok_ctor_properties (ctype
, decl
))
9117 if (ctype
== NULL_TREE
|| check
)
9121 DECL_VIRTUAL_P (decl
) = 1;
9126 /* decl is a FUNCTION_DECL.
9127 specifiers are the parsed virt-specifiers.
9129 Set flags to reflect the virt-specifiers.
9134 set_virt_specifiers (tree decl
, cp_virt_specifiers specifiers
)
9136 if (decl
== NULL_TREE
)
9138 if (specifiers
& VIRT_SPEC_OVERRIDE
)
9139 DECL_OVERRIDE_P (decl
) = 1;
9140 if (specifiers
& VIRT_SPEC_FINAL
)
9141 DECL_FINAL_P (decl
) = 1;
9145 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
9146 the linkage that DECL will receive in the object file. */
9149 set_linkage_for_static_data_member (tree decl
)
9151 /* A static data member always has static storage duration and
9152 external linkage. Note that static data members are forbidden in
9153 local classes -- the only situation in which a class has
9154 non-external linkage. */
9155 TREE_PUBLIC (decl
) = 1;
9156 TREE_STATIC (decl
) = 1;
9157 /* For non-template classes, static data members are always put
9158 out in exactly those files where they are defined, just as
9159 with ordinary namespace-scope variables. */
9160 if (!processing_template_decl
)
9161 DECL_INTERFACE_KNOWN (decl
) = 1;
9164 /* Create a VAR_DECL named NAME with the indicated TYPE.
9166 If SCOPE is non-NULL, it is the class type or namespace containing
9167 the variable. If SCOPE is NULL, the variable should is created in
9168 the innermost enclosing scope. */
9171 grokvardecl (tree type
,
9173 tree orig_declarator
,
9174 const cp_decl_specifier_seq
*declspecs
,
9183 tree explicit_scope
;
9185 gcc_assert (!name
|| identifier_p (name
));
9187 bool constp
= (type_quals
& TYPE_QUAL_CONST
) != 0;
9188 bool volatilep
= (type_quals
& TYPE_QUAL_VOLATILE
) != 0;
9190 /* Compute the scope in which to place the variable, but remember
9191 whether or not that scope was explicitly specified by the user. */
9192 explicit_scope
= scope
;
9195 /* An explicit "extern" specifier indicates a namespace-scope
9197 if (declspecs
->storage_class
== sc_extern
)
9198 scope
= current_decl_namespace ();
9199 else if (!at_function_scope_p ())
9200 scope
= current_scope ();
9204 && (/* If the variable is a namespace-scope variable declared in a
9205 template, we need DECL_LANG_SPECIFIC. */
9206 (TREE_CODE (scope
) == NAMESPACE_DECL
&& processing_template_decl
)
9207 /* Similarly for namespace-scope variables with language linkage
9209 || (TREE_CODE (scope
) == NAMESPACE_DECL
9210 && current_lang_name
!= lang_name_cplusplus
)
9211 /* Similarly for static data members. */
9213 /* Similarly for explicit specializations. */
9215 && TREE_CODE (orig_declarator
) == TEMPLATE_ID_EXPR
)))
9216 decl
= build_lang_decl (VAR_DECL
, name
, type
);
9218 decl
= build_decl (input_location
, VAR_DECL
, name
, type
);
9220 if (explicit_scope
&& TREE_CODE (explicit_scope
) == NAMESPACE_DECL
)
9221 set_decl_namespace (decl
, explicit_scope
, 0);
9223 DECL_CONTEXT (decl
) = FROB_CONTEXT (scope
);
9225 if (declspecs
->storage_class
== sc_extern
)
9227 DECL_THIS_EXTERN (decl
) = 1;
9228 DECL_EXTERNAL (decl
) = !initialized
;
9231 if (DECL_CLASS_SCOPE_P (decl
))
9233 set_linkage_for_static_data_member (decl
);
9234 /* This function is only called with out-of-class definitions. */
9235 DECL_EXTERNAL (decl
) = 0;
9236 check_class_member_definition_namespace (decl
);
9238 /* At top level, either `static' or no s.c. makes a definition
9239 (perhaps tentative), and absence of `static' makes it public. */
9240 else if (toplevel_bindings_p ())
9242 TREE_PUBLIC (decl
) = (declspecs
->storage_class
!= sc_static
9243 && (DECL_THIS_EXTERN (decl
)
9247 TREE_STATIC (decl
) = ! DECL_EXTERNAL (decl
);
9249 /* Not at top level, only `static' makes a static definition. */
9252 TREE_STATIC (decl
) = declspecs
->storage_class
== sc_static
;
9253 TREE_PUBLIC (decl
) = DECL_EXTERNAL (decl
);
9256 if (decl_spec_seq_has_spec_p (declspecs
, ds_thread
))
9258 if (DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
9260 CP_DECL_THREAD_LOCAL_P (decl
) = true;
9261 if (!processing_template_decl
)
9262 set_decl_tls_model (decl
, decl_default_tls_model (decl
));
9264 if (declspecs
->gnu_thread_keyword_p
)
9265 SET_DECL_GNU_TLS_P (decl
);
9268 /* If the type of the decl has no linkage, make sure that we'll
9269 notice that in mark_used. */
9270 if (cxx_dialect
> cxx98
9271 && decl_linkage (decl
) != lk_none
9272 && DECL_LANG_SPECIFIC (decl
) == NULL
9273 && !DECL_EXTERN_C_P (decl
)
9274 && no_linkage_check (TREE_TYPE (decl
), /*relaxed_p=*/false))
9275 retrofit_lang_decl (decl
);
9277 if (TREE_PUBLIC (decl
))
9279 /* [basic.link]: A name with no linkage (notably, the name of a class
9280 or enumeration declared in a local scope) shall not be used to
9281 declare an entity with linkage.
9283 DR 757 relaxes this restriction for C++0x. */
9284 if (cxx_dialect
< cxx11
)
9285 no_linkage_error (decl
);
9288 DECL_INTERFACE_KNOWN (decl
) = 1;
9290 if (DECL_NAME (decl
)
9291 && MAIN_NAME_P (DECL_NAME (decl
))
9292 && scope
== global_namespace
)
9293 error ("cannot declare %<::main%> to be a global variable");
9295 /* Check that the variable can be safely declared as a concept.
9296 Note that this also forbids explicit specializations. */
9299 if (!processing_template_decl
)
9301 error ("a non-template variable cannot be %<concept%>");
9305 DECL_DECLARED_CONCEPT_P (decl
) = true;
9306 if (!same_type_ignoring_top_level_qualifiers_p (type
, boolean_type_node
))
9307 error_at (declspecs
->locations
[ds_type_spec
],
9308 "concept must have type %<bool%>");
9310 else if (flag_concepts
9311 && processing_template_decl
> template_class_depth (scope
))
9313 tree reqs
= TEMPLATE_PARMS_CONSTRAINTS (current_template_parms
);
9314 tree ci
= build_constraints (reqs
, NULL_TREE
);
9315 set_constraints (decl
, ci
);
9318 // Handle explicit specializations and instantiations of variable templates.
9319 if (orig_declarator
)
9320 decl
= check_explicit_specialization (orig_declarator
, decl
,
9321 template_count
, conceptp
* 8);
9323 return decl
!= error_mark_node
? decl
: NULL_TREE
;
9326 /* Create and return a canonical pointer to member function type, for
9327 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
9330 build_ptrmemfunc_type (tree type
)
9335 if (type
== error_mark_node
)
9338 /* Make sure that we always have the unqualified pointer-to-member
9340 if (cp_cv_quals quals
= cp_type_quals (type
))
9342 tree unqual
= build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type
));
9343 return cp_build_qualified_type (unqual
, quals
);
9346 /* If a canonical type already exists for this type, use it. We use
9347 this method instead of type_hash_canon, because it only does a
9348 simple equality check on the list of field members. */
9350 t
= TYPE_PTRMEMFUNC_TYPE (type
);
9354 t
= make_node (RECORD_TYPE
);
9356 /* Let the front end know this is a pointer to member function. */
9357 TYPE_PTRMEMFUNC_FLAG (t
) = 1;
9359 field
= build_decl (input_location
, FIELD_DECL
, pfn_identifier
, type
);
9362 field
= build_decl (input_location
, FIELD_DECL
, delta_identifier
,
9364 DECL_CHAIN (field
) = fields
;
9367 finish_builtin_struct (t
, "__ptrmemfunc_type", fields
, ptr_type_node
);
9369 /* Zap out the name so that the back end will give us the debugging
9370 information for this anonymous RECORD_TYPE. */
9371 TYPE_NAME (t
) = NULL_TREE
;
9373 /* Cache this pointer-to-member type so that we can find it again
9375 TYPE_PTRMEMFUNC_TYPE (type
) = t
;
9377 if (TYPE_STRUCTURAL_EQUALITY_P (type
))
9378 SET_TYPE_STRUCTURAL_EQUALITY (t
);
9379 else if (TYPE_CANONICAL (type
) != type
)
9380 TYPE_CANONICAL (t
) = build_ptrmemfunc_type (TYPE_CANONICAL (type
));
9385 /* Create and return a pointer to data member type. */
9388 build_ptrmem_type (tree class_type
, tree member_type
)
9390 if (TREE_CODE (member_type
) == METHOD_TYPE
)
9392 cp_cv_quals quals
= type_memfn_quals (member_type
);
9393 cp_ref_qualifier rqual
= type_memfn_rqual (member_type
);
9394 member_type
= build_memfn_type (member_type
, class_type
, quals
, rqual
);
9395 return build_ptrmemfunc_type (build_pointer_type (member_type
));
9399 gcc_assert (TREE_CODE (member_type
) != FUNCTION_TYPE
);
9400 return build_offset_type (class_type
, member_type
);
9404 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
9405 Check to see that the definition is valid. Issue appropriate error
9406 messages. Return 1 if the definition is particularly bad, or 0
9410 check_static_variable_definition (tree decl
, tree type
)
9412 /* Avoid redundant diagnostics on out-of-class definitions. */
9413 if (!current_class_type
|| !TYPE_BEING_DEFINED (current_class_type
))
9415 /* Can't check yet if we don't know the type. */
9416 if (dependent_type_p (type
))
9418 /* If DECL is declared constexpr, we'll do the appropriate checks
9419 in check_initializer. Similarly for inline static data members. */
9421 && (DECL_DECLARED_CONSTEXPR_P (decl
)
9422 || DECL_VAR_DECLARED_INLINE_P (decl
)))
9424 else if (cxx_dialect
>= cxx11
&& !INTEGRAL_OR_ENUMERATION_TYPE_P (type
))
9426 if (!COMPLETE_TYPE_P (type
))
9427 error_at (DECL_SOURCE_LOCATION (decl
),
9428 "in-class initialization of static data member %q#D of "
9429 "incomplete type", decl
);
9430 else if (literal_type_p (type
))
9431 permerror (DECL_SOURCE_LOCATION (decl
),
9432 "%<constexpr%> needed for in-class initialization of "
9433 "static data member %q#D of non-integral type", decl
);
9435 error_at (DECL_SOURCE_LOCATION (decl
),
9436 "in-class initialization of static data member %q#D of "
9437 "non-literal type", decl
);
9441 /* Motion 10 at San Diego: If a static const integral data member is
9442 initialized with an integral constant expression, the initializer
9443 may appear either in the declaration (within the class), or in
9444 the definition, but not both. If it appears in the class, the
9445 member is a member constant. The file-scope definition is always
9447 if (!ARITHMETIC_TYPE_P (type
) && TREE_CODE (type
) != ENUMERAL_TYPE
)
9449 error_at (DECL_SOURCE_LOCATION (decl
),
9450 "invalid in-class initialization of static data member "
9451 "of non-integral type %qT",
9455 else if (!CP_TYPE_CONST_P (type
))
9456 error_at (DECL_SOURCE_LOCATION (decl
),
9457 "ISO C++ forbids in-class initialization of non-const "
9458 "static member %qD",
9460 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type
))
9461 pedwarn (DECL_SOURCE_LOCATION (decl
), OPT_Wpedantic
,
9462 "ISO C++ forbids initialization of member constant "
9463 "%qD of non-integral type %qT", decl
, type
);
9468 /* *expr_p is part of the TYPE_SIZE of a variably-sized array. If any
9469 SAVE_EXPRs in *expr_p wrap expressions with side-effects, break those
9470 expressions out into temporary variables so that walk_tree doesn't
9471 step into them (c++/15764). */
9474 stabilize_save_expr_r (tree
*expr_p
, int *walk_subtrees
, void *data
)
9476 hash_set
<tree
> *pset
= (hash_set
<tree
> *)data
;
9477 tree expr
= *expr_p
;
9478 if (TREE_CODE (expr
) == SAVE_EXPR
)
9480 tree op
= TREE_OPERAND (expr
, 0);
9481 cp_walk_tree (&op
, stabilize_save_expr_r
, data
, pset
);
9482 if (TREE_SIDE_EFFECTS (op
))
9483 TREE_OPERAND (expr
, 0) = get_temp_regvar (TREE_TYPE (op
), op
);
9486 else if (!EXPR_P (expr
) || !TREE_SIDE_EFFECTS (expr
))
9491 /* Entry point for the above. */
9494 stabilize_vla_size (tree size
)
9496 hash_set
<tree
> pset
;
9497 /* Break out any function calls into temporary variables. */
9498 cp_walk_tree (&size
, stabilize_save_expr_r
, &pset
, &pset
);
9501 /* Reduce a SIZEOF_EXPR to its value. */
9504 fold_sizeof_expr (tree t
)
9507 if (SIZEOF_EXPR_TYPE_P (t
))
9508 r
= cxx_sizeof_or_alignof_type (TREE_TYPE (TREE_OPERAND (t
, 0)),
9509 SIZEOF_EXPR
, false);
9510 else if (TYPE_P (TREE_OPERAND (t
, 0)))
9511 r
= cxx_sizeof_or_alignof_type (TREE_OPERAND (t
, 0), SIZEOF_EXPR
,
9514 r
= cxx_sizeof_or_alignof_expr (TREE_OPERAND (t
, 0), SIZEOF_EXPR
,
9516 if (r
== error_mark_node
)
9521 /* Given the SIZE (i.e., number of elements) in an array, compute
9522 an appropriate index type for the array. If non-NULL, NAME is
9523 the name of the entity being declared. */
9526 compute_array_index_type (tree name
, tree size
, tsubst_flags_t complain
)
9531 if (error_operand_p (size
))
9532 return error_mark_node
;
9534 if (!type_dependent_expression_p (size
))
9536 osize
= size
= mark_rvalue_use (size
);
9538 if (cxx_dialect
< cxx11
&& TREE_CODE (size
) == NOP_EXPR
9539 && TREE_SIDE_EFFECTS (size
))
9540 /* In C++98, we mark a non-constant array bound with a magic
9541 NOP_EXPR with TREE_SIDE_EFFECTS; don't fold in that case. */;
9544 size
= instantiate_non_dependent_expr_sfinae (size
, complain
);
9545 size
= build_converted_constant_expr (size_type_node
, size
, complain
);
9546 size
= maybe_constant_value (size
);
9548 if (!TREE_CONSTANT (size
))
9552 if (error_operand_p (size
))
9553 return error_mark_node
;
9555 /* The array bound must be an integer type. */
9556 tree type
= TREE_TYPE (size
);
9557 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type
))
9559 if (!(complain
& tf_error
))
9560 return error_mark_node
;
9562 error ("size of array %qD has non-integral type %qT", name
, type
);
9564 error ("size of array has non-integral type %qT", type
);
9565 size
= integer_one_node
;
9569 /* A type is dependent if it is...an array type constructed from any
9570 dependent type or whose size is specified by a constant expression
9571 that is value-dependent. */
9572 /* We can only call value_dependent_expression_p on integral constant
9573 expressions; treat non-constant expressions as dependent, too. */
9574 if (processing_template_decl
9575 && (type_dependent_expression_p (size
)
9576 || !TREE_CONSTANT (size
) || value_dependent_expression_p (size
)))
9578 /* We cannot do any checking for a SIZE that isn't known to be
9579 constant. Just build the index type and mark that it requires
9580 structural equality checks. */
9581 itype
= build_index_type (build_min (MINUS_EXPR
, sizetype
,
9582 size
, size_one_node
));
9583 TYPE_DEPENDENT_P (itype
) = 1;
9584 TYPE_DEPENDENT_P_VALID (itype
) = 1;
9585 SET_TYPE_STRUCTURAL_EQUALITY (itype
);
9589 if (TREE_CODE (size
) != INTEGER_CST
)
9591 tree folded
= cp_fully_fold (size
);
9592 if (TREE_CODE (folded
) == INTEGER_CST
)
9593 pedwarn (location_of (size
), OPT_Wpedantic
,
9594 "size of array is not an integral constant-expression");
9595 /* Use the folded result for VLAs, too; it will have resolved
9600 /* Normally, the array-bound will be a constant. */
9601 if (TREE_CODE (size
) == INTEGER_CST
)
9603 /* An array must have a positive number of elements. */
9604 if (!valid_constant_size_p (size
))
9606 if (!(complain
& tf_error
))
9607 return error_mark_node
;
9610 error ("size of array %qD is negative", name
);
9612 error ("size of array is negative");
9613 size
= integer_one_node
;
9615 /* As an extension we allow zero-sized arrays. */
9616 else if (integer_zerop (size
))
9618 if (!(complain
& tf_error
))
9619 /* We must fail if performing argument deduction (as
9620 indicated by the state of complain), so that
9621 another substitution can be found. */
9622 return error_mark_node
;
9623 else if (in_system_header_at (input_location
))
9624 /* Allow them in system headers because glibc uses them. */;
9626 pedwarn (input_location
, OPT_Wpedantic
, "ISO C++ forbids zero-size array %qD", name
);
9628 pedwarn (input_location
, OPT_Wpedantic
, "ISO C++ forbids zero-size array");
9631 else if (TREE_CONSTANT (size
)
9632 /* We don't allow VLAs at non-function scopes, or during
9633 tentative template substitution. */
9634 || !at_function_scope_p ()
9635 || !(complain
& tf_error
))
9637 if (!(complain
& tf_error
))
9638 return error_mark_node
;
9639 /* `(int) &fn' is not a valid array bound. */
9641 error ("size of array %qD is not an integral constant-expression",
9644 error ("size of array is not an integral constant-expression");
9645 size
= integer_one_node
;
9647 else if (pedantic
&& warn_vla
!= 0)
9650 pedwarn (input_location
, OPT_Wvla
, "ISO C++ forbids variable length array %qD", name
);
9652 pedwarn (input_location
, OPT_Wvla
, "ISO C++ forbids variable length array");
9654 else if (warn_vla
> 0)
9658 "variable length array %qD is used", name
);
9661 "variable length array is used");
9664 if (processing_template_decl
&& !TREE_CONSTANT (size
))
9665 /* A variable sized array. */
9666 itype
= build_min (MINUS_EXPR
, sizetype
, size
, integer_one_node
);
9669 /* Compute the index of the largest element in the array. It is
9670 one less than the number of elements in the array. We save
9671 and restore PROCESSING_TEMPLATE_DECL so that computations in
9672 cp_build_binary_op will be appropriately folded. */
9674 processing_template_decl_sentinel s
;
9675 itype
= cp_build_binary_op (input_location
,
9677 cp_convert (ssizetype
, size
, complain
),
9678 cp_convert (ssizetype
, integer_one_node
,
9681 itype
= maybe_constant_value (itype
);
9684 if (!TREE_CONSTANT (itype
))
9686 /* A variable sized array. */
9687 itype
= variable_size (itype
);
9689 stabilize_vla_size (itype
);
9691 if (sanitize_flags_p (SANITIZE_VLA
)
9692 && current_function_decl
!= NULL_TREE
)
9694 /* We have to add 1 -- in the ubsan routine we generate
9695 LE_EXPR rather than LT_EXPR. */
9696 tree t
= fold_build2 (PLUS_EXPR
, TREE_TYPE (itype
), itype
,
9697 build_one_cst (TREE_TYPE (itype
)));
9698 t
= ubsan_instrument_vla (input_location
, t
);
9699 finish_expr_stmt (t
);
9702 /* Make sure that there was no overflow when creating to a signed
9703 index type. (For example, on a 32-bit machine, an array with
9704 size 2^32 - 1 is too big.) */
9705 else if (TREE_CODE (itype
) == INTEGER_CST
9706 && TREE_OVERFLOW (itype
))
9708 if (!(complain
& tf_error
))
9709 return error_mark_node
;
9710 error ("overflow in array dimension");
9711 TREE_OVERFLOW (itype
) = 0;
9715 /* Create and return the appropriate index type. */
9716 itype
= build_index_type (itype
);
9718 /* If the index type were dependent, we would have returned early, so
9719 remember that it isn't. */
9720 TYPE_DEPENDENT_P (itype
) = 0;
9721 TYPE_DEPENDENT_P_VALID (itype
) = 1;
9725 /* Returns the scope (if any) in which the entity declared by
9726 DECLARATOR will be located. If the entity was declared with an
9727 unqualified name, NULL_TREE is returned. */
9730 get_scope_of_declarator (const cp_declarator
*declarator
)
9732 while (declarator
&& declarator
->kind
!= cdk_id
)
9733 declarator
= declarator
->declarator
;
9735 /* If the declarator-id is a SCOPE_REF, the scope in which the
9736 declaration occurs is the first operand. */
9738 && declarator
->u
.id
.qualifying_scope
)
9739 return declarator
->u
.id
.qualifying_scope
;
9741 /* Otherwise, the declarator is not a qualified name; the entity will
9742 be declared in the current scope. */
9746 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
9747 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
9751 create_array_type_for_decl (tree name
, tree type
, tree size
)
9753 tree itype
= NULL_TREE
;
9755 /* If things have already gone awry, bail now. */
9756 if (type
== error_mark_node
|| size
== error_mark_node
)
9757 return error_mark_node
;
9759 /* 8.3.4/1: If the type of the identifier of D contains the auto
9760 type-specifier, the program is ill-formed. */
9761 if (type_uses_auto (type
))
9763 error ("%qD declared as array of %qT", name
, type
);
9764 return error_mark_node
;
9767 /* If there are some types which cannot be array elements,
9768 issue an error-message and return. */
9769 switch (TREE_CODE (type
))
9773 error ("declaration of %qD as array of void", name
);
9775 error ("creating array of void");
9776 return error_mark_node
;
9780 error ("declaration of %qD as array of functions", name
);
9782 error ("creating array of functions");
9783 return error_mark_node
;
9785 case REFERENCE_TYPE
:
9787 error ("declaration of %qD as array of references", name
);
9789 error ("creating array of references");
9790 return error_mark_node
;
9794 error ("declaration of %qD as array of function members", name
);
9796 error ("creating array of function members");
9797 return error_mark_node
;
9805 The constant expressions that specify the bounds of the arrays
9806 can be omitted only for the first member of the sequence. */
9807 if (TREE_CODE (type
) == ARRAY_TYPE
&& !TYPE_DOMAIN (type
))
9810 error ("declaration of %qD as multidimensional array must "
9811 "have bounds for all dimensions except the first",
9814 error ("multidimensional array must have bounds for all "
9815 "dimensions except the first");
9817 return error_mark_node
;
9820 /* Figure out the index type for the array. */
9822 itype
= compute_array_index_type (name
, size
, tf_warning_or_error
);
9825 T is called the array element type; this type shall not be [...] an
9826 abstract class type. */
9827 abstract_virtuals_error (name
, type
);
9829 return build_cplus_array_type (type
, itype
);
9832 /* Returns the smallest location != UNKNOWN_LOCATION among the
9833 three stored in LOCATIONS[ds_const], LOCATIONS[ds_volatile],
9834 and LOCATIONS[ds_restrict]. */
9837 smallest_type_quals_location (int type_quals
, const location_t
* locations
)
9839 location_t loc
= UNKNOWN_LOCATION
;
9841 if (type_quals
& TYPE_QUAL_CONST
)
9842 loc
= locations
[ds_const
];
9844 if ((type_quals
& TYPE_QUAL_VOLATILE
)
9845 && (loc
== UNKNOWN_LOCATION
|| locations
[ds_volatile
] < loc
))
9846 loc
= locations
[ds_volatile
];
9848 if ((type_quals
& TYPE_QUAL_RESTRICT
)
9849 && (loc
== UNKNOWN_LOCATION
|| locations
[ds_restrict
] < loc
))
9850 loc
= locations
[ds_restrict
];
9855 /* Check that it's OK to declare a function with the indicated TYPE
9856 and TYPE_QUALS. SFK indicates the kind of special function (if any)
9857 that this function is. OPTYPE is the type given in a conversion
9858 operator declaration, or the class type for a constructor/destructor.
9859 Returns the actual return type of the function; that may be different
9860 than TYPE if an error occurs, or for certain special functions. */
9863 check_special_function_return_type (special_function_kind sfk
,
9867 const location_t
* locations
)
9871 case sfk_constructor
:
9873 error ("return type specification for constructor invalid");
9874 else if (type_quals
!= TYPE_UNQUALIFIED
)
9875 error_at (smallest_type_quals_location (type_quals
, locations
),
9876 "qualifiers are not allowed on constructor declaration");
9878 if (targetm
.cxx
.cdtor_returns_this ())
9879 type
= build_pointer_type (optype
);
9881 type
= void_type_node
;
9884 case sfk_destructor
:
9886 error ("return type specification for destructor invalid");
9887 else if (type_quals
!= TYPE_UNQUALIFIED
)
9888 error_at (smallest_type_quals_location (type_quals
, locations
),
9889 "qualifiers are not allowed on destructor declaration");
9891 /* We can't use the proper return type here because we run into
9892 problems with ambiguous bases and covariant returns. */
9893 if (targetm
.cxx
.cdtor_returns_this ())
9894 type
= build_pointer_type (void_type_node
);
9896 type
= void_type_node
;
9899 case sfk_conversion
:
9901 error ("return type specified for %<operator %T%>", optype
);
9902 else if (type_quals
!= TYPE_UNQUALIFIED
)
9903 error_at (smallest_type_quals_location (type_quals
, locations
),
9904 "qualifiers are not allowed on declaration of "
9905 "%<operator %T%>", optype
);
9910 case sfk_deduction_guide
:
9912 error ("return type specified for deduction guide");
9913 else if (type_quals
!= TYPE_UNQUALIFIED
)
9914 error_at (smallest_type_quals_location (type_quals
, locations
),
9915 "qualifiers are not allowed on declaration of "
9917 if (TREE_CODE (optype
) == TEMPLATE_TEMPLATE_PARM
)
9919 error ("template template parameter %qT in declaration of "
9920 "deduction guide", optype
);
9921 type
= error_mark_node
;
9924 type
= make_template_placeholder (CLASSTYPE_TI_TEMPLATE (optype
));
9925 for (int i
= 0; i
< ds_last
; ++i
)
9926 if (i
!= ds_explicit
&& locations
[i
])
9927 error_at (locations
[i
],
9928 "decl-specifier in declaration of deduction guide");
9938 /* A variable or data member (whose unqualified name is IDENTIFIER)
9939 has been declared with the indicated TYPE. If the TYPE is not
9940 acceptable, issue an error message and return a type to use for
9941 error-recovery purposes. */
9944 check_var_type (tree identifier
, tree type
)
9946 if (VOID_TYPE_P (type
))
9949 error ("unnamed variable or field declared void");
9950 else if (identifier_p (identifier
))
9952 gcc_assert (!IDENTIFIER_ANY_OP_P (identifier
));
9953 error ("variable or field %qE declared void", identifier
);
9956 error ("variable or field declared void");
9957 type
= error_mark_node
;
9963 /* Handle declaring DECL as an inline variable. */
9966 mark_inline_variable (tree decl
)
9968 bool inlinep
= true;
9969 if (! toplevel_bindings_p ())
9971 error ("%<inline%> specifier invalid for variable "
9972 "%qD declared at block scope", decl
);
9975 else if (cxx_dialect
< cxx17
)
9976 pedwarn (DECL_SOURCE_LOCATION (decl
), 0,
9977 "inline variables are only available "
9978 "with -std=c++17 or -std=gnu++17");
9981 retrofit_lang_decl (decl
);
9982 SET_DECL_VAR_DECLARED_INLINE_P (decl
);
9987 /* Assign a typedef-given name to a class or enumeration type declared
9988 as anonymous at first. This was split out of grokdeclarator
9989 because it is also used in libcc1. */
9992 name_unnamed_type (tree type
, tree decl
)
9994 gcc_assert (TYPE_UNNAMED_P (type
));
9996 /* Replace the anonymous name with the real name everywhere. */
9997 for (tree t
= TYPE_MAIN_VARIANT (type
); t
; t
= TYPE_NEXT_VARIANT (t
))
9999 if (anon_aggrname_p (TYPE_IDENTIFIER (t
)))
10000 /* We do not rename the debug info representing the
10001 unnamed tagged type because the standard says in
10002 [dcl.typedef] that the naming applies only for
10003 linkage purposes. */
10004 /*debug_hooks->set_name (t, decl);*/
10005 TYPE_NAME (t
) = decl
;
10008 if (TYPE_LANG_SPECIFIC (type
))
10009 TYPE_WAS_UNNAMED (type
) = 1;
10011 /* If this is a typedef within a template class, the nested
10012 type is a (non-primary) template. The name for the
10013 template needs updating as well. */
10014 if (TYPE_LANG_SPECIFIC (type
) && CLASSTYPE_TEMPLATE_INFO (type
))
10015 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type
))
10016 = TYPE_IDENTIFIER (type
);
10018 /* Adjust linkage now that we aren't unnamed anymore. */
10019 reset_type_linkage (type
);
10021 /* FIXME remangle member functions; member functions of a
10022 type with external linkage have external linkage. */
10024 /* Check that our job is done, and that it would fail if we
10025 attempted to do it again. */
10026 gcc_assert (!TYPE_UNNAMED_P (type
));
10029 /* Given declspecs and a declarator (abstract or otherwise), determine
10030 the name and type of the object declared and construct a DECL node
10033 DECLSPECS points to the representation of declaration-specifier
10034 sequence that precedes declarator.
10036 DECL_CONTEXT says which syntactic context this declaration is in:
10037 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
10038 FUNCDEF for a function definition. Like NORMAL but a few different
10039 error messages in each case. Return value may be zero meaning
10040 this definition is too screwy to try to parse.
10041 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
10042 handle member functions (which have FIELD context).
10043 Return value may be zero meaning this definition is too screwy to
10045 PARM for a parameter declaration (either within a function prototype
10046 or before a function body). Make a PARM_DECL, or return void_type_node.
10047 TPARM for a template parameter declaration.
10048 CATCHPARM for a parameter declaration before a catch clause.
10049 TYPENAME if for a typename (in a cast or sizeof).
10050 Don't make a DECL node; just return the ..._TYPE node.
10051 FIELD for a struct or union field; make a FIELD_DECL.
10052 BITFIELD for a field with specified width.
10054 INITIALIZED is as for start_decl.
10056 ATTRLIST is a pointer to the list of attributes, which may be NULL
10057 if there are none; *ATTRLIST may be modified if attributes from inside
10058 the declarator should be applied to the declaration.
10060 When this function is called, scoping variables (such as
10061 CURRENT_CLASS_TYPE) should reflect the scope in which the
10062 declaration occurs, not the scope in which the new declaration will
10063 be placed. For example, on:
10065 void S::f() { ... }
10067 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
10070 Returns a DECL (if a declarator is present), a TYPE (if there is no
10071 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
10075 grokdeclarator (const cp_declarator
*declarator
,
10076 cp_decl_specifier_seq
*declspecs
,
10077 enum decl_context decl_context
,
10081 tree type
= NULL_TREE
;
10083 int explicit_intN
= 0;
10084 int virtualp
, explicitp
, friendp
, inlinep
, staticp
;
10085 int explicit_int
= 0;
10086 int explicit_char
= 0;
10087 int defaulted_int
= 0;
10089 tree typedef_decl
= NULL_TREE
;
10090 const char *name
= NULL
;
10091 tree typedef_type
= NULL_TREE
;
10092 /* True if this declarator is a function definition. */
10093 bool funcdef_flag
= false;
10094 cp_declarator_kind innermost_code
= cdk_error
;
10097 /* See the code below that used this. */
10098 tree decl_attr
= NULL_TREE
;
10101 /* Keep track of what sort of function is being processed
10102 so that we can warn about default return values, or explicit
10103 return values which do not match prescribed defaults. */
10104 special_function_kind sfk
= sfk_none
;
10106 tree dname
= NULL_TREE
;
10107 tree ctor_return_type
= NULL_TREE
;
10108 enum overload_flags flags
= NO_SPECIAL
;
10109 /* cv-qualifiers that apply to the declarator, for a declaration of
10110 a member function. */
10111 cp_cv_quals memfn_quals
= TYPE_UNQUALIFIED
;
10112 /* virt-specifiers that apply to the declarator, for a declaration of
10113 a member function. */
10114 cp_virt_specifiers virt_specifiers
= VIRT_SPEC_UNSPECIFIED
;
10115 /* ref-qualifier that applies to the declarator, for a declaration of
10116 a member function. */
10117 cp_ref_qualifier rqual
= REF_QUAL_NONE
;
10118 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
10119 int type_quals
= TYPE_UNQUALIFIED
;
10120 tree raises
= NULL_TREE
;
10121 int template_count
= 0;
10122 tree returned_attrs
= NULL_TREE
;
10123 tree parms
= NULL_TREE
;
10124 const cp_declarator
*id_declarator
;
10125 /* The unqualified name of the declarator; either an
10126 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
10127 tree unqualified_id
;
10128 /* The class type, if any, in which this entity is located,
10129 or NULL_TREE if none. Note that this value may be different from
10130 the current class type; for example if an attempt is made to declare
10131 "A::f" inside "B", this value will be "A". */
10132 tree ctype
= current_class_type
;
10133 /* The NAMESPACE_DECL for the namespace in which this entity is
10134 located. If an unqualified name is used to declare the entity,
10135 this value will be NULL_TREE, even if the entity is located at
10136 namespace scope. */
10137 tree in_namespace
= NULL_TREE
;
10138 cp_storage_class storage_class
;
10139 bool unsigned_p
, signed_p
, short_p
, long_p
, thread_p
;
10140 bool type_was_error_mark_node
= false;
10141 bool parameter_pack_p
= declarator
? declarator
->parameter_pack_p
: false;
10142 bool template_type_arg
= false;
10143 bool template_parm_flag
= false;
10144 bool typedef_p
= decl_spec_seq_has_spec_p (declspecs
, ds_typedef
);
10145 bool constexpr_p
= decl_spec_seq_has_spec_p (declspecs
, ds_constexpr
);
10146 bool late_return_type_p
= false;
10147 bool array_parameter_p
= false;
10148 source_location saved_loc
= input_location
;
10149 tree reqs
= NULL_TREE
;
10151 signed_p
= decl_spec_seq_has_spec_p (declspecs
, ds_signed
);
10152 unsigned_p
= decl_spec_seq_has_spec_p (declspecs
, ds_unsigned
);
10153 short_p
= decl_spec_seq_has_spec_p (declspecs
, ds_short
);
10154 long_p
= decl_spec_seq_has_spec_p (declspecs
, ds_long
);
10155 longlong
= decl_spec_seq_has_spec_p (declspecs
, ds_long_long
);
10156 explicit_intN
= declspecs
->explicit_intN_p
;
10157 thread_p
= decl_spec_seq_has_spec_p (declspecs
, ds_thread
);
10159 // Was concept_p specified? Note that ds_concept
10160 // implies ds_constexpr!
10161 bool concept_p
= decl_spec_seq_has_spec_p (declspecs
, ds_concept
);
10163 constexpr_p
= true;
10165 if (decl_spec_seq_has_spec_p (declspecs
, ds_const
))
10166 type_quals
|= TYPE_QUAL_CONST
;
10167 if (decl_spec_seq_has_spec_p (declspecs
, ds_volatile
))
10168 type_quals
|= TYPE_QUAL_VOLATILE
;
10169 if (decl_spec_seq_has_spec_p (declspecs
, ds_restrict
))
10170 type_quals
|= TYPE_QUAL_RESTRICT
;
10172 if (decl_context
== FUNCDEF
)
10173 funcdef_flag
= true, decl_context
= NORMAL
;
10174 else if (decl_context
== MEMFUNCDEF
)
10175 funcdef_flag
= true, decl_context
= FIELD
;
10176 else if (decl_context
== BITFIELD
)
10177 bitfield
= 1, decl_context
= FIELD
;
10178 else if (decl_context
== TEMPLATE_TYPE_ARG
)
10179 template_type_arg
= true, decl_context
= TYPENAME
;
10180 else if (decl_context
== TPARM
)
10181 template_parm_flag
= true, decl_context
= PARM
;
10183 if (initialized
> 1)
10184 funcdef_flag
= true;
10186 location_t typespec_loc
= smallest_type_quals_location (type_quals
,
10187 declspecs
->locations
);
10188 if (typespec_loc
== UNKNOWN_LOCATION
)
10189 typespec_loc
= declspecs
->locations
[ds_type_spec
];
10190 if (typespec_loc
== UNKNOWN_LOCATION
)
10191 typespec_loc
= input_location
;
10193 /* Look inside a declarator for the name being declared
10194 and get it as a string, for an error message. */
10195 for (id_declarator
= declarator
;
10197 id_declarator
= id_declarator
->declarator
)
10199 if (id_declarator
->kind
!= cdk_id
)
10200 innermost_code
= id_declarator
->kind
;
10202 switch (id_declarator
->kind
)
10205 if (id_declarator
->declarator
10206 && id_declarator
->declarator
->kind
== cdk_id
)
10208 sfk
= id_declarator
->declarator
->u
.id
.sfk
;
10209 if (sfk
== sfk_destructor
)
10216 tree qualifying_scope
= id_declarator
->u
.id
.qualifying_scope
;
10217 tree decl
= id_declarator
->u
.id
.unqualified_name
;
10220 if (qualifying_scope
)
10222 if (at_function_scope_p ())
10226 A declarator-id shall not be qualified except
10229 None of the cases are permitted in block
10231 if (qualifying_scope
== global_namespace
)
10232 error ("invalid use of qualified-name %<::%D%>",
10234 else if (TYPE_P (qualifying_scope
))
10235 error ("invalid use of qualified-name %<%T::%D%>",
10236 qualifying_scope
, decl
);
10238 error ("invalid use of qualified-name %<%D::%D%>",
10239 qualifying_scope
, decl
);
10240 return error_mark_node
;
10242 else if (TYPE_P (qualifying_scope
))
10244 ctype
= qualifying_scope
;
10245 if (!MAYBE_CLASS_TYPE_P (ctype
))
10247 error ("%q#T is not a class or a namespace", ctype
);
10250 else if (innermost_code
!= cdk_function
10251 && current_class_type
10252 && !uniquely_derived_from_p (ctype
,
10253 current_class_type
))
10255 error ("invalid use of qualified-name %<%T::%D%>",
10256 qualifying_scope
, decl
);
10257 return error_mark_node
;
10260 else if (TREE_CODE (qualifying_scope
) == NAMESPACE_DECL
)
10261 in_namespace
= qualifying_scope
;
10263 switch (TREE_CODE (decl
))
10267 if (innermost_code
!= cdk_function
)
10269 error ("declaration of %qD as non-function", decl
);
10270 return error_mark_node
;
10272 else if (!qualifying_scope
10273 && !(current_class_type
&& at_class_scope_p ()))
10275 error ("declaration of %qD as non-member", decl
);
10276 return error_mark_node
;
10279 tree type
= TREE_OPERAND (decl
, 0);
10281 type
= constructor_name (type
);
10282 name
= identifier_to_locale (IDENTIFIER_POINTER (type
));
10287 case TEMPLATE_ID_EXPR
:
10289 tree fns
= TREE_OPERAND (decl
, 0);
10292 if (!identifier_p (dname
))
10293 dname
= OVL_NAME (dname
);
10295 /* Fall through. */
10297 case IDENTIFIER_NODE
:
10298 if (identifier_p (decl
))
10301 if (IDENTIFIER_KEYWORD_P (dname
))
10303 error ("declarator-id missing; using reserved word %qD",
10305 name
= identifier_to_locale (IDENTIFIER_POINTER (dname
));
10307 else if (!IDENTIFIER_CONV_OP_P (dname
))
10308 name
= identifier_to_locale (IDENTIFIER_POINTER (dname
));
10311 gcc_assert (flags
== NO_SPECIAL
);
10312 flags
= TYPENAME_FLAG
;
10313 sfk
= sfk_conversion
;
10314 tree glob
= get_global_binding (dname
);
10315 if (glob
&& TREE_CODE (glob
) == TYPE_DECL
)
10316 name
= identifier_to_locale (IDENTIFIER_POINTER (dname
));
10318 name
= "<invalid operator>";
10323 gcc_unreachable ();
10330 case cdk_reference
:
10335 name
= "structured binding";
10339 return error_mark_node
;
10342 gcc_unreachable ();
10344 if (id_declarator
->kind
== cdk_id
)
10350 The declarator in a function-definition shall have the form
10351 D1 ( parameter-declaration-clause) ... */
10352 if (funcdef_flag
&& innermost_code
!= cdk_function
)
10354 error ("function definition does not declare parameters");
10355 return error_mark_node
;
10358 if (flags
== TYPENAME_FLAG
10359 && innermost_code
!= cdk_function
10360 && ! (ctype
&& !declspecs
->any_specifiers_p
))
10362 error ("declaration of %qD as non-function", dname
);
10363 return error_mark_node
;
10366 if (dname
&& identifier_p (dname
))
10368 if (UDLIT_OPER_P (dname
)
10369 && innermost_code
!= cdk_function
)
10371 error ("declaration of %qD as non-function", dname
);
10372 return error_mark_node
;
10375 if (IDENTIFIER_ANY_OP_P (dname
))
10379 error ("declaration of %qD as %<typedef%>", dname
);
10380 return error_mark_node
;
10382 else if (decl_context
== PARM
|| decl_context
== CATCHPARM
)
10384 error ("declaration of %qD as parameter", dname
);
10385 return error_mark_node
;
10390 /* Anything declared one level down from the top level
10391 must be one of the parameters of a function
10392 (because the body is at least two levels down). */
10394 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
10395 by not allowing C++ class definitions to specify their parameters
10396 with xdecls (must be spec.d in the parmlist).
10398 Since we now wait to push a class scope until we are sure that
10399 we are in a legitimate method context, we must set oldcname
10400 explicitly (since current_class_name is not yet alive).
10402 We also want to avoid calling this a PARM if it is in a namespace. */
10404 if (decl_context
== NORMAL
&& !toplevel_bindings_p ())
10406 cp_binding_level
*b
= current_binding_level
;
10407 current_binding_level
= b
->level_chain
;
10408 if (current_binding_level
!= 0 && toplevel_bindings_p ())
10409 decl_context
= PARM
;
10410 current_binding_level
= b
;
10414 name
= decl_context
== PARM
? "parameter" : "type name";
10416 if (concept_p
&& typedef_p
)
10418 error ("%<concept%> cannot appear in a typedef declaration");
10419 return error_mark_node
;
10422 if (constexpr_p
&& typedef_p
)
10424 error ("%<constexpr%> cannot appear in a typedef declaration");
10425 return error_mark_node
;
10428 /* If there were multiple types specified in the decl-specifier-seq,
10429 issue an error message. */
10430 if (declspecs
->multiple_types_p
)
10432 error ("two or more data types in declaration of %qs", name
);
10433 return error_mark_node
;
10436 if (declspecs
->conflicting_specifiers_p
)
10438 error ("conflicting specifiers in declaration of %qs", name
);
10439 return error_mark_node
;
10442 /* Extract the basic type from the decl-specifier-seq. */
10443 type
= declspecs
->type
;
10444 if (type
== error_mark_node
)
10447 type_was_error_mark_node
= true;
10449 /* If the entire declaration is itself tagged as deprecated then
10450 suppress reports of deprecated items. */
10451 if (type
&& TREE_DEPRECATED (type
)
10452 && deprecated_state
!= DEPRECATED_SUPPRESS
)
10453 cp_warn_deprecated_use (type
);
10454 if (type
&& TREE_CODE (type
) == TYPE_DECL
)
10456 typedef_decl
= type
;
10457 type
= TREE_TYPE (typedef_decl
);
10458 if (TREE_DEPRECATED (type
)
10459 && DECL_ARTIFICIAL (typedef_decl
)
10460 && deprecated_state
!= DEPRECATED_SUPPRESS
)
10461 cp_warn_deprecated_use (type
);
10463 /* No type at all: default to `int', and set DEFAULTED_INT
10464 because it was not a user-defined typedef. */
10465 if (type
== NULL_TREE
)
10467 if (signed_p
|| unsigned_p
|| long_p
|| short_p
)
10469 /* These imply 'int'. */
10470 type
= integer_type_node
;
10473 /* If we just have "complex", it is equivalent to "complex double". */
10474 else if (!longlong
&& !explicit_intN
10475 && decl_spec_seq_has_spec_p (declspecs
, ds_complex
))
10477 type
= double_type_node
;
10478 pedwarn (declspecs
->locations
[ds_complex
], OPT_Wpedantic
,
10479 "ISO C++ does not support plain %<complex%> meaning "
10480 "%<double complex%>");
10483 /* Gather flags. */
10484 explicit_int
= declspecs
->explicit_int_p
;
10485 explicit_char
= declspecs
->explicit_char_p
;
10488 /* See the code below that used this. */
10490 decl_attr
= DECL_ATTRIBUTES (typedef_decl
);
10492 typedef_type
= type
;
10494 if (sfk
== sfk_conversion
|| sfk
== sfk_deduction_guide
)
10495 ctor_return_type
= TREE_TYPE (dname
);
10497 ctor_return_type
= ctype
;
10499 if (sfk
!= sfk_none
)
10501 type
= check_special_function_return_type (sfk
, type
,
10504 declspecs
->locations
);
10505 type_quals
= TYPE_UNQUALIFIED
;
10507 else if (type
== NULL_TREE
)
10513 /* We handle `main' specially here, because 'main () { }' is so
10514 common. With no options, it is allowed. With -Wreturn-type,
10515 it is a warning. It is only an error with -pedantic-errors. */
10516 is_main
= (funcdef_flag
10517 && dname
&& identifier_p (dname
)
10518 && MAIN_NAME_P (dname
)
10519 && ctype
== NULL_TREE
10520 && in_namespace
== NULL_TREE
10521 && current_namespace
== global_namespace
);
10523 if (type_was_error_mark_node
)
10524 /* We've already issued an error, don't complain more. */;
10525 else if (in_system_header_at (input_location
) || flag_ms_extensions
)
10526 /* Allow it, sigh. */;
10527 else if (! is_main
)
10528 permerror (input_location
, "ISO C++ forbids declaration of %qs with no type", name
);
10530 pedwarn (input_location
, OPT_Wpedantic
,
10531 "ISO C++ forbids declaration of %qs with no type", name
);
10533 warning (OPT_Wreturn_type
,
10534 "ISO C++ forbids declaration of %qs with no type", name
);
10536 if (type_was_error_mark_node
&& template_parm_flag
)
10537 /* FIXME we should be able to propagate the error_mark_node as is
10538 for other contexts too. */
10539 type
= error_mark_node
;
10541 type
= integer_type_node
;
10548 if (! int_n_enabled_p
[declspecs
->int_n_idx
])
10550 error ("%<__int%d%> is not supported by this target",
10551 int_n_data
[declspecs
->int_n_idx
].bitsize
);
10552 explicit_intN
= false;
10554 else if (pedantic
&& ! in_system_header_at (input_location
))
10555 pedwarn (input_location
, OPT_Wpedantic
,
10556 "ISO C++ does not support %<__int%d%> for %qs",
10557 int_n_data
[declspecs
->int_n_idx
].bitsize
, name
);
10560 /* Now process the modifiers that were specified
10561 and check for invalid combinations. */
10563 /* Long double is a special combination. */
10564 if (long_p
&& !longlong
&& TYPE_MAIN_VARIANT (type
) == double_type_node
)
10567 type
= cp_build_qualified_type (long_double_type_node
,
10568 cp_type_quals (type
));
10571 /* Check all other uses of type modifiers. */
10573 if (unsigned_p
|| signed_p
|| long_p
|| short_p
)
10577 if ((signed_p
|| unsigned_p
) && TREE_CODE (type
) != INTEGER_TYPE
)
10578 error ("%<signed%> or %<unsigned%> invalid for %qs", name
);
10579 else if (signed_p
&& unsigned_p
)
10580 error ("%<signed%> and %<unsigned%> specified together for %qs", name
);
10581 else if (longlong
&& TREE_CODE (type
) != INTEGER_TYPE
)
10582 error ("%<long long%> invalid for %qs", name
);
10583 else if (long_p
&& TREE_CODE (type
) == REAL_TYPE
)
10584 error ("%<long%> invalid for %qs", name
);
10585 else if (short_p
&& TREE_CODE (type
) == REAL_TYPE
)
10586 error ("%<short%> invalid for %qs", name
);
10587 else if ((long_p
|| short_p
) && TREE_CODE (type
) != INTEGER_TYPE
)
10588 error ("%<long%> or %<short%> invalid for %qs", name
);
10589 else if ((long_p
|| short_p
|| explicit_char
|| explicit_int
) && explicit_intN
)
10590 error ("%<long%>, %<int%>, %<short%>, or %<char%> invalid for %qs", name
);
10591 else if ((long_p
|| short_p
) && explicit_char
)
10592 error ("%<long%> or %<short%> specified with char for %qs", name
);
10593 else if (long_p
&& short_p
)
10594 error ("%<long%> and %<short%> specified together for %qs", name
);
10595 else if (type
== char16_type_node
|| type
== char32_type_node
)
10597 if (signed_p
|| unsigned_p
)
10598 error ("%<signed%> or %<unsigned%> invalid for %qs", name
);
10599 else if (short_p
|| long_p
)
10600 error ("%<short%> or %<long%> invalid for %qs", name
);
10605 if (!explicit_int
&& !defaulted_int
&& !explicit_char
&& !explicit_intN
&& pedantic
)
10607 pedwarn (input_location
, OPT_Wpedantic
,
10608 "long, short, signed or unsigned used invalidly for %qs",
10610 if (flag_pedantic_errors
)
10615 /* Discard the type modifiers if they are invalid. */
10618 unsigned_p
= false;
10626 /* Decide whether an integer type is signed or not.
10627 Optionally treat bitfields as signed by default. */
10631 It is implementation-defined whether a plain (neither
10632 explicitly signed or unsigned) char, short, int, or long
10633 bit-field is signed or unsigned.
10635 Naturally, we extend this to long long as well. Note that
10636 this does not include wchar_t. */
10637 || (bitfield
&& !flag_signed_bitfields
10639 /* A typedef for plain `int' without `signed' can be
10640 controlled just like plain `int', but a typedef for
10641 `signed int' cannot be so controlled. */
10643 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
))
10644 && TREE_CODE (type
) == INTEGER_TYPE
10645 && !same_type_p (TYPE_MAIN_VARIANT (type
), wchar_type_node
)))
10648 type
= int_n_trees
[declspecs
->int_n_idx
].unsigned_type
;
10650 type
= long_long_unsigned_type_node
;
10652 type
= long_unsigned_type_node
;
10654 type
= short_unsigned_type_node
;
10655 else if (type
== char_type_node
)
10656 type
= unsigned_char_type_node
;
10657 else if (typedef_decl
)
10658 type
= unsigned_type_for (type
);
10660 type
= unsigned_type_node
;
10662 else if (signed_p
&& type
== char_type_node
)
10663 type
= signed_char_type_node
;
10664 else if (explicit_intN
)
10665 type
= int_n_trees
[declspecs
->int_n_idx
].signed_type
;
10667 type
= long_long_integer_type_node
;
10669 type
= long_integer_type_node
;
10671 type
= short_integer_type_node
;
10673 if (decl_spec_seq_has_spec_p (declspecs
, ds_complex
))
10675 if (TREE_CODE (type
) != INTEGER_TYPE
&& TREE_CODE (type
) != REAL_TYPE
)
10676 error ("complex invalid for %qs", name
);
10677 /* If a modifier is specified, the resulting complex is the complex
10678 form of TYPE. E.g, "complex short" is "complex short int". */
10679 else if (type
== integer_type_node
)
10680 type
= complex_integer_type_node
;
10681 else if (type
== float_type_node
)
10682 type
= complex_float_type_node
;
10683 else if (type
== double_type_node
)
10684 type
= complex_double_type_node
;
10685 else if (type
== long_double_type_node
)
10686 type
= complex_long_double_type_node
;
10688 type
= build_complex_type (type
);
10691 /* If we're using the injected-class-name to form a compound type or a
10692 declaration, replace it with the underlying class so we don't get
10693 redundant typedefs in the debug output. But if we are returning the
10694 type unchanged, leave it alone so that it's available to
10695 maybe_get_template_decl_from_type_decl. */
10696 if (CLASS_TYPE_P (type
)
10697 && DECL_SELF_REFERENCE_P (TYPE_NAME (type
))
10698 && type
== TREE_TYPE (TYPE_NAME (type
))
10699 && (declarator
|| type_quals
))
10700 type
= DECL_ORIGINAL_TYPE (TYPE_NAME (type
));
10702 type_quals
|= cp_type_quals (type
);
10703 type
= cp_build_qualified_type_real
10704 (type
, type_quals
, ((((typedef_decl
&& !DECL_ARTIFICIAL (typedef_decl
))
10705 || declspecs
->decltype_p
)
10706 ? tf_ignore_bad_quals
: 0) | tf_warning_or_error
));
10707 /* We might have ignored or rejected some of the qualifiers. */
10708 type_quals
= cp_type_quals (type
);
10710 if (cxx_dialect
>= cxx17
&& type
&& is_auto (type
)
10711 && innermost_code
!= cdk_function
10712 && id_declarator
&& declarator
!= id_declarator
)
10713 if (tree tmpl
= CLASS_PLACEHOLDER_TEMPLATE (type
))
10715 error_at (typespec_loc
, "template placeholder type %qT must be followed "
10716 "by a simple declarator-id", type
);
10717 inform (DECL_SOURCE_LOCATION (tmpl
), "%qD declared here", tmpl
);
10721 inlinep
= decl_spec_seq_has_spec_p (declspecs
, ds_inline
);
10722 virtualp
= decl_spec_seq_has_spec_p (declspecs
, ds_virtual
);
10723 explicitp
= decl_spec_seq_has_spec_p (declspecs
, ds_explicit
);
10725 storage_class
= declspecs
->storage_class
;
10726 if (storage_class
== sc_static
)
10727 staticp
= 1 + (decl_context
== FIELD
);
10733 error ("member %qD cannot be declared both %<virtual%> "
10734 "and %<static%>", dname
);
10735 storage_class
= sc_none
;
10739 error ("member %qD cannot be declared both %<virtual%> "
10740 "and %<constexpr%>", dname
);
10742 friendp
= decl_spec_seq_has_spec_p (declspecs
, ds_friend
);
10744 /* Issue errors about use of storage classes for parameters. */
10745 if (decl_context
== PARM
)
10749 error ("typedef declaration invalid in parameter declaration");
10750 return error_mark_node
;
10752 else if (template_parm_flag
&& storage_class
!= sc_none
)
10754 error ("storage class specified for template parameter %qs", name
);
10755 return error_mark_node
;
10757 else if (storage_class
== sc_static
10758 || storage_class
== sc_extern
10760 error ("storage class specifiers invalid in parameter declarations");
10762 /* Function parameters cannot be concept. */
10764 error ("a parameter cannot be declared %<concept%>");
10765 /* Function parameters cannot be constexpr. If we saw one, moan
10766 and pretend it wasn't there. */
10767 else if (constexpr_p
)
10769 error ("a parameter cannot be declared %<constexpr%>");
10774 /* Give error if `virtual' is used outside of class declaration. */
10776 && (current_class_name
== NULL_TREE
|| decl_context
!= FIELD
))
10778 error_at (declspecs
->locations
[ds_virtual
],
10779 "%<virtual%> outside class declaration");
10783 if (innermost_code
== cdk_decomp
)
10785 location_t loc
= (declarator
->kind
== cdk_reference
10786 ? declarator
->declarator
->id_loc
: declarator
->id_loc
);
10788 error_at (declspecs
->locations
[ds_inline
],
10789 "structured binding declaration cannot be %<inline%>");
10791 error_at (declspecs
->locations
[ds_typedef
],
10792 "structured binding declaration cannot be %<typedef%>");
10794 error_at (declspecs
->locations
[ds_constexpr
], "structured "
10795 "binding declaration cannot be %<constexpr%>");
10797 error_at (declspecs
->locations
[ds_thread
],
10798 "structured binding declaration cannot be %qs",
10799 declspecs
->gnu_thread_keyword_p
10800 ? "__thread" : "thread_local");
10802 error_at (declspecs
->locations
[ds_concept
],
10803 "structured binding declaration cannot be %<concept%>");
10804 switch (storage_class
)
10809 error_at (loc
, "structured binding declaration cannot be "
10813 error_at (loc
, "structured binding declaration cannot be "
10817 error_at (loc
, "structured binding declaration cannot be "
10821 error_at (loc
, "structured binding declaration cannot be "
10825 error_at (loc
, "structured binding declaration cannot be "
10829 gcc_unreachable ();
10831 if (TREE_CODE (type
) != TEMPLATE_TYPE_PARM
10832 || TYPE_IDENTIFIER (type
) != auto_identifier
)
10834 if (type
!= error_mark_node
)
10836 error_at (loc
, "structured binding declaration cannot have "
10839 "type must be cv-qualified %<auto%> or reference to "
10840 "cv-qualified %<auto%>");
10842 type
= build_qualified_type (make_auto (), type_quals
);
10843 declspecs
->type
= type
;
10850 storage_class
= sc_none
;
10852 declspecs
->storage_class
= sc_none
;
10853 declspecs
->locations
[ds_thread
] = UNKNOWN_LOCATION
;
10856 /* Static anonymous unions are dealt with here. */
10857 if (staticp
&& decl_context
== TYPENAME
10859 && ANON_AGGR_TYPE_P (declspecs
->type
))
10860 decl_context
= FIELD
;
10862 /* Warn about storage classes that are invalid for certain
10863 kinds of declarations (parameters, typenames, etc.). */
10866 && storage_class
!= sc_extern
10867 && storage_class
!= sc_static
)
10870 error ("multiple storage classes in declaration of %qs", name
);
10873 if (decl_context
!= NORMAL
10874 && ((storage_class
!= sc_none
10875 && storage_class
!= sc_mutable
)
10878 if ((decl_context
== PARM
|| decl_context
== CATCHPARM
)
10879 && (storage_class
== sc_register
10880 || storage_class
== sc_auto
))
10882 else if (typedef_p
)
10884 else if (decl_context
== FIELD
10885 /* C++ allows static class elements. */
10886 && storage_class
== sc_static
)
10887 /* C++ also allows inlines and signed and unsigned elements,
10888 but in those cases we don't come in here. */
10892 if (decl_context
== FIELD
)
10893 error ("storage class specified for %qs", name
);
10896 if (decl_context
== PARM
|| decl_context
== CATCHPARM
)
10897 error ("storage class specified for parameter %qs", name
);
10899 error ("storage class specified for typename");
10901 if (storage_class
== sc_register
10902 || storage_class
== sc_auto
10903 || storage_class
== sc_extern
10905 storage_class
= sc_none
;
10908 else if (storage_class
== sc_extern
&& funcdef_flag
10909 && ! toplevel_bindings_p ())
10910 error ("nested function %qs declared %<extern%>", name
);
10911 else if (toplevel_bindings_p ())
10913 if (storage_class
== sc_auto
)
10914 error ("top-level declaration of %qs specifies %<auto%>", name
);
10917 && storage_class
!= sc_extern
10918 && storage_class
!= sc_static
)
10920 if (declspecs
->gnu_thread_keyword_p
)
10921 pedwarn (input_location
, 0, "function-scope %qs implicitly auto and "
10922 "declared %<__thread%>", name
);
10924 /* When thread_local is applied to a variable of block scope the
10925 storage-class-specifier static is implied if it does not appear
10927 storage_class
= declspecs
->storage_class
= sc_static
;
10931 if (storage_class
&& friendp
)
10933 error ("storage class specifiers invalid in friend function declarations");
10934 storage_class
= sc_none
;
10938 if (!id_declarator
)
10939 unqualified_id
= NULL_TREE
;
10942 unqualified_id
= id_declarator
->u
.id
.unqualified_name
;
10943 switch (TREE_CODE (unqualified_id
))
10946 unqualified_id
= TREE_OPERAND (unqualified_id
, 0);
10947 if (TYPE_P (unqualified_id
))
10948 unqualified_id
= constructor_name (unqualified_id
);
10951 case IDENTIFIER_NODE
:
10952 case TEMPLATE_ID_EXPR
:
10956 gcc_unreachable ();
10960 if (declspecs
->std_attributes
)
10962 location_t attr_loc
= declspecs
->locations
[ds_std_attribute
];
10963 if (warning_at (attr_loc
, OPT_Wattributes
, "attribute ignored"))
10964 inform (attr_loc
, "an attribute that appertains to a type-specifier "
10968 /* Determine the type of the entity declared by recurring on the
10970 for (; declarator
; declarator
= declarator
->declarator
)
10972 const cp_declarator
*inner_declarator
;
10975 if (type
== error_mark_node
)
10976 return error_mark_node
;
10978 attrs
= declarator
->attributes
;
10984 if (declarator
== NULL
|| declarator
->kind
== cdk_id
)
10985 attr_flags
|= (int) ATTR_FLAG_DECL_NEXT
;
10986 if (declarator
->kind
== cdk_function
)
10987 attr_flags
|= (int) ATTR_FLAG_FUNCTION_NEXT
;
10988 if (declarator
->kind
== cdk_array
)
10989 attr_flags
|= (int) ATTR_FLAG_ARRAY_NEXT
;
10990 returned_attrs
= decl_attributes (&type
,
10991 chainon (returned_attrs
, attrs
),
10995 inner_declarator
= declarator
->declarator
;
10997 /* We don't want to warn in parameter context because we don't
10998 yet know if the parse will succeed, and this might turn out
10999 to be a constructor call. */
11000 if (decl_context
!= PARM
11001 && decl_context
!= TYPENAME
11003 && declarator
->parenthesized
!= UNKNOWN_LOCATION
11004 /* If the type is class-like and the inner name used a
11005 global namespace qualifier, we need the parens.
11006 Unfortunately all we can tell is whether a qualified name
11007 was used or not. */
11008 && !(inner_declarator
11009 && inner_declarator
->kind
== cdk_id
11010 && inner_declarator
->u
.id
.qualifying_scope
11011 && (MAYBE_CLASS_TYPE_P (type
)
11012 || TREE_CODE (type
) == ENUMERAL_TYPE
)))
11013 warning_at (declarator
->parenthesized
, OPT_Wparentheses
,
11014 "unnecessary parentheses in declaration of %qs", name
);
11015 if (declarator
->kind
== cdk_id
|| declarator
->kind
== cdk_decomp
)
11018 switch (declarator
->kind
)
11021 type
= create_array_type_for_decl (dname
, type
,
11022 declarator
->u
.array
.bounds
);
11023 if (!valid_array_size_p (input_location
, type
, dname
))
11024 type
= error_mark_node
;
11026 if (declarator
->std_attributes
)
11029 The optional attribute-specifier-seq appertains to the
11031 returned_attrs
= chainon (returned_attrs
,
11032 declarator
->std_attributes
);
11040 /* Declaring a function type. */
11042 input_location
= declspecs
->locations
[ds_type_spec
];
11043 abstract_virtuals_error (ACU_RETURN
, type
);
11044 input_location
= saved_loc
;
11046 /* Pick up type qualifiers which should be applied to `this'. */
11047 memfn_quals
= declarator
->u
.function
.qualifiers
;
11048 /* Pick up virt-specifiers. */
11049 virt_specifiers
= declarator
->u
.function
.virt_specifiers
;
11050 /* And ref-qualifier, too */
11051 rqual
= declarator
->u
.function
.ref_qualifier
;
11052 /* And tx-qualifier. */
11053 tree tx_qual
= declarator
->u
.function
.tx_qualifier
;
11054 /* Pick up the exception specifications. */
11055 raises
= declarator
->u
.function
.exception_specification
;
11056 /* If the exception-specification is ill-formed, let's pretend
11057 there wasn't one. */
11058 if (raises
== error_mark_node
)
11059 raises
= NULL_TREE
;
11062 error_at (location_of (reqs
), "requires-clause on return type");
11063 reqs
= declarator
->u
.function
.requires_clause
;
11065 /* Say it's a definition only for the CALL_EXPR
11066 closest to the identifier. */
11067 funcdecl_p
= inner_declarator
&& inner_declarator
->kind
== cdk_id
;
11069 /* Handle a late-specified return type. */
11070 tree late_return_type
= declarator
->u
.function
.late_return_type
;
11073 if (tree auto_node
= type_uses_auto (type
))
11075 if (!late_return_type
)
11077 if (current_class_type
11078 && LAMBDA_TYPE_P (current_class_type
))
11079 /* OK for C++11 lambdas. */;
11080 else if (cxx_dialect
< cxx14
)
11082 error ("%qs function uses "
11083 "%<auto%> type specifier without trailing "
11084 "return type", name
);
11085 inform (input_location
, "deduced return type "
11086 "only available with -std=c++14 or "
11091 error ("virtual function cannot "
11092 "have deduced return type");
11096 else if (!is_auto (type
) && sfk
!= sfk_conversion
)
11098 error ("%qs function with trailing return type has"
11099 " %qT as its type rather than plain %<auto%>",
11101 return error_mark_node
;
11103 if (tree tmpl
= CLASS_PLACEHOLDER_TEMPLATE (auto_node
))
11105 if (!late_return_type
)
11107 if (dguide_name_p (unqualified_id
))
11108 error_at (declarator
->id_loc
, "deduction guide "
11109 "for %qT must have trailing return "
11110 "type", TREE_TYPE (tmpl
));
11112 error_at (declarator
->id_loc
, "deduced class "
11113 "type %qT in function return type",
11115 inform (DECL_SOURCE_LOCATION (tmpl
),
11116 "%qD declared here", tmpl
);
11118 else if (CLASS_TYPE_P (late_return_type
)
11119 && CLASSTYPE_TEMPLATE_INFO (late_return_type
)
11120 && (CLASSTYPE_TI_TEMPLATE (late_return_type
)
11124 error ("trailing return type %qT of deduction guide "
11125 "is not a specialization of %qT",
11126 late_return_type
, TREE_TYPE (tmpl
));
11129 else if (late_return_type
11130 && sfk
!= sfk_conversion
)
11132 if (cxx_dialect
< cxx11
)
11133 /* Not using maybe_warn_cpp0x because this should
11134 always be an error. */
11135 error ("trailing return type only available with "
11136 "-std=c++11 or -std=gnu++11");
11138 error ("%qs function with trailing return type not "
11139 "declared with %<auto%> type specifier", name
);
11140 return error_mark_node
;
11143 type
= splice_late_return_type (type
, late_return_type
);
11144 if (type
== error_mark_node
)
11145 return error_mark_node
;
11147 if (late_return_type
)
11149 late_return_type_p
= true;
11150 type_quals
= cp_type_quals (type
);
11153 if (type_quals
!= TYPE_UNQUALIFIED
)
11155 if (SCALAR_TYPE_P (type
) || VOID_TYPE_P (type
))
11156 warning_at (typespec_loc
, OPT_Wignored_qualifiers
, "type "
11157 "qualifiers ignored on function return type");
11158 /* We now know that the TYPE_QUALS don't apply to the
11159 decl, but to its return type. */
11160 type_quals
= TYPE_UNQUALIFIED
;
11163 /* Error about some types functions can't return. */
11165 if (TREE_CODE (type
) == FUNCTION_TYPE
)
11167 error_at (typespec_loc
, "%qs declared as function returning "
11168 "a function", name
);
11169 return error_mark_node
;
11171 if (TREE_CODE (type
) == ARRAY_TYPE
)
11173 error_at (typespec_loc
, "%qs declared as function returning "
11175 return error_mark_node
;
11178 if (ctype
== NULL_TREE
11179 && decl_context
== FIELD
11182 ctype
= current_class_type
;
11184 if (ctype
&& (sfk
== sfk_constructor
11185 || sfk
== sfk_destructor
))
11187 /* We are within a class's scope. If our declarator name
11188 is the same as the class name, and we are defining
11189 a function, then it is a constructor/destructor, and
11190 therefore returns a void type. */
11192 /* ISO C++ 12.4/2. A destructor may not be declared
11193 const or volatile. A destructor may not be static.
11194 A destructor may not be declared with ref-qualifier.
11196 ISO C++ 12.1. A constructor may not be declared
11197 const or volatile. A constructor may not be
11198 virtual. A constructor may not be static.
11199 A constructor may not be declared with ref-qualifier. */
11201 error ((flags
== DTOR_FLAG
)
11202 ? G_("destructor cannot be static member function")
11203 : G_("constructor cannot be static member function"));
11206 error ((flags
== DTOR_FLAG
)
11207 ? G_("destructors may not be cv-qualified")
11208 : G_("constructors may not be cv-qualified"));
11209 memfn_quals
= TYPE_UNQUALIFIED
;
11214 maybe_warn_cpp0x (CPP0X_REF_QUALIFIER
);
11215 error ((flags
== DTOR_FLAG
)
11216 ? G_("destructors may not be ref-qualified")
11217 : G_("constructors may not be ref-qualified"));
11218 rqual
= REF_QUAL_NONE
;
11221 if (decl_context
== FIELD
11222 && !member_function_or_else (ctype
,
11223 current_class_type
,
11225 return error_mark_node
;
11227 if (flags
!= DTOR_FLAG
)
11229 /* It's a constructor. */
11230 if (explicitp
== 1)
11234 permerror (input_location
,
11235 "constructors cannot be declared %<virtual%>");
11238 if (decl_context
== FIELD
11239 && sfk
!= sfk_constructor
)
11240 return error_mark_node
;
11242 if (decl_context
== FIELD
)
11249 /* Cannot be both friend and virtual. */
11250 error ("virtual functions cannot be friends");
11253 if (decl_context
== NORMAL
)
11254 error ("friend declaration not in class definition");
11255 if (current_function_decl
&& funcdef_flag
)
11256 error ("can%'t define friend function %qs in a local "
11257 "class definition",
11260 else if (ctype
&& sfk
== sfk_conversion
)
11262 if (explicitp
== 1)
11264 maybe_warn_cpp0x (CPP0X_EXPLICIT_CONVERSION
);
11267 if (late_return_type_p
)
11268 error ("a conversion function cannot have a trailing return type");
11270 else if (sfk
== sfk_deduction_guide
)
11272 if (explicitp
== 1)
11276 tree pushed_scope
= NULL_TREE
;
11278 && decl_context
!= FIELD
11279 && inner_declarator
->u
.id
.qualifying_scope
11280 && CLASS_TYPE_P (inner_declarator
->u
.id
.qualifying_scope
))
11282 = push_scope (inner_declarator
->u
.id
.qualifying_scope
);
11284 arg_types
= grokparms (declarator
->u
.function
.parameters
, &parms
);
11287 pop_scope (pushed_scope
);
11289 if (inner_declarator
11290 && inner_declarator
->kind
== cdk_id
11291 && inner_declarator
->u
.id
.sfk
== sfk_destructor
11292 && arg_types
!= void_list_node
)
11294 error ("destructors may not have parameters");
11295 arg_types
= void_list_node
;
11299 type
= build_function_type (type
, arg_types
);
11301 tree attrs
= declarator
->std_attributes
;
11304 tree att
= build_tree_list (tx_qual
, NULL_TREE
);
11305 /* transaction_safe applies to the type, but
11306 transaction_safe_dynamic applies to the function. */
11307 if (is_attribute_p ("transaction_safe", tx_qual
))
11308 attrs
= chainon (attrs
, att
);
11310 returned_attrs
= chainon (returned_attrs
, att
);
11315 The optional attribute-specifier-seq appertains to
11316 the function type. */
11317 decl_attributes (&type
, attrs
, 0);
11320 type
= build_exception_variant (type
, raises
);
11325 case cdk_reference
:
11327 /* Filter out pointers-to-references and references-to-references.
11328 We can get these if a TYPE_DECL is used. */
11330 if (TREE_CODE (type
) == REFERENCE_TYPE
)
11332 if (declarator
->kind
!= cdk_reference
)
11334 error ("cannot declare pointer to %q#T", type
);
11335 type
= TREE_TYPE (type
);
11338 /* In C++0x, we allow reference to reference declarations
11339 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
11340 and template type arguments [14.3.1/4 temp.arg.type]. The
11341 check for direct reference to reference declarations, which
11342 are still forbidden, occurs below. Reasoning behind the change
11343 can be found in DR106, DR540, and the rvalue reference
11345 else if (cxx_dialect
== cxx98
)
11347 error ("cannot declare reference to %q#T", type
);
11348 type
= TREE_TYPE (type
);
11351 else if (VOID_TYPE_P (type
))
11353 if (declarator
->kind
== cdk_reference
)
11354 error ("cannot declare reference to %q#T", type
);
11355 else if (declarator
->kind
== cdk_ptrmem
)
11356 error ("cannot declare pointer to %q#T member", type
);
11359 /* We now know that the TYPE_QUALS don't apply to the decl,
11360 but to the target of the pointer. */
11361 type_quals
= TYPE_UNQUALIFIED
;
11363 /* This code used to handle METHOD_TYPE, but I don't think it's
11364 possible to get it here anymore. */
11365 gcc_assert (TREE_CODE (type
) != METHOD_TYPE
);
11366 if (declarator
->kind
== cdk_ptrmem
11367 && TREE_CODE (type
) == FUNCTION_TYPE
)
11369 memfn_quals
|= type_memfn_quals (type
);
11370 type
= build_memfn_type (type
,
11371 declarator
->u
.pointer
.class_type
,
11374 if (type
== error_mark_node
)
11375 return error_mark_node
;
11377 rqual
= REF_QUAL_NONE
;
11378 memfn_quals
= TYPE_UNQUALIFIED
;
11381 if (TREE_CODE (type
) == FUNCTION_TYPE
11382 && (type_memfn_quals (type
) != TYPE_UNQUALIFIED
11383 || type_memfn_rqual (type
) != REF_QUAL_NONE
))
11384 error (declarator
->kind
== cdk_reference
11385 ? G_("cannot declare reference to qualified function type %qT")
11386 : G_("cannot declare pointer to qualified function type %qT"),
11389 /* When the pointed-to type involves components of variable size,
11390 care must be taken to ensure that the size evaluation code is
11391 emitted early enough to dominate all the possible later uses
11392 and late enough for the variables on which it depends to have
11395 This is expected to happen automatically when the pointed-to
11396 type has a name/declaration of it's own, but special attention
11397 is required if the type is anonymous.
11399 We handle the NORMAL and FIELD contexts here by inserting a
11400 dummy statement that just evaluates the size at a safe point
11401 and ensures it is not deferred until e.g. within a deeper
11402 conditional context (c++/43555).
11404 We expect nothing to be needed here for PARM or TYPENAME.
11405 Evaluating the size at this point for TYPENAME would
11406 actually be incorrect, as we might be in the middle of an
11407 expression with side effects on the pointed-to type size
11408 "arguments" prior to the pointer declaration point and the
11409 size evaluation could end up prior to the side effects. */
11411 if (!TYPE_NAME (type
)
11412 && (decl_context
== NORMAL
|| decl_context
== FIELD
)
11413 && at_function_scope_p ()
11414 && variably_modified_type_p (type
, NULL_TREE
))
11416 TYPE_NAME (type
) = build_decl (UNKNOWN_LOCATION
, TYPE_DECL
,
11418 add_decl_expr (TYPE_NAME (type
));
11421 if (declarator
->kind
== cdk_reference
)
11423 /* In C++0x, the type we are creating a reference to might be
11424 a typedef which is itself a reference type. In that case,
11425 we follow the reference collapsing rules in
11426 [7.1.3/8 dcl.typedef] to create the final reference type:
11428 "If a typedef TD names a type that is a reference to a type
11429 T, an attempt to create the type 'lvalue reference to cv TD'
11430 creates the type 'lvalue reference to T,' while an attempt
11431 to create the type "rvalue reference to cv TD' creates the
11434 if (VOID_TYPE_P (type
))
11435 /* We already gave an error. */;
11436 else if (TREE_CODE (type
) == REFERENCE_TYPE
)
11438 if (declarator
->u
.reference
.rvalue_ref
)
11439 /* Leave type alone. */;
11441 type
= cp_build_reference_type (TREE_TYPE (type
), false);
11444 type
= cp_build_reference_type
11445 (type
, declarator
->u
.reference
.rvalue_ref
);
11447 /* In C++0x, we need this check for direct reference to
11448 reference declarations, which are forbidden by
11449 [8.3.2/5 dcl.ref]. Reference to reference declarations
11450 are only allowed indirectly through typedefs and template
11451 type arguments. Example:
11453 void foo(int & &); // invalid ref-to-ref decl
11455 typedef int & int_ref;
11456 void foo(int_ref &); // valid ref-to-ref decl
11458 if (inner_declarator
&& inner_declarator
->kind
== cdk_reference
)
11459 error ("cannot declare reference to %q#T, which is not "
11460 "a typedef or a template type argument", type
);
11462 else if (TREE_CODE (type
) == METHOD_TYPE
)
11463 type
= build_ptrmemfunc_type (build_pointer_type (type
));
11464 else if (declarator
->kind
== cdk_ptrmem
)
11466 gcc_assert (TREE_CODE (declarator
->u
.pointer
.class_type
)
11467 != NAMESPACE_DECL
);
11468 if (declarator
->u
.pointer
.class_type
== error_mark_node
)
11469 /* We will already have complained. */
11470 type
= error_mark_node
;
11472 type
= build_ptrmem_type (declarator
->u
.pointer
.class_type
,
11476 type
= build_pointer_type (type
);
11478 /* Process a list of type modifier keywords (such as
11479 const or volatile) that were given inside the `*' or `&'. */
11481 if (declarator
->u
.pointer
.qualifiers
)
11484 = cp_build_qualified_type (type
,
11485 declarator
->u
.pointer
.qualifiers
);
11486 type_quals
= cp_type_quals (type
);
11489 /* Apply C++11 attributes to the pointer, and not to the
11490 type pointed to. This is unlike what is done for GNU
11491 attributes above. It is to comply with [dcl.ptr]/1:
11493 [the optional attribute-specifier-seq (7.6.1) appertains
11494 to the pointer and not to the object pointed to]. */
11495 if (declarator
->std_attributes
)
11496 decl_attributes (&type
, declarator
->std_attributes
,
11506 gcc_unreachable ();
11510 /* A `constexpr' specifier used in an object declaration declares
11511 the object as `const'. */
11512 if (constexpr_p
&& innermost_code
!= cdk_function
)
11514 /* DR1688 says that a `constexpr' specifier in combination with
11515 `volatile' is valid. */
11517 if (TREE_CODE (type
) != REFERENCE_TYPE
)
11519 type_quals
|= TYPE_QUAL_CONST
;
11520 type
= cp_build_qualified_type (type
, type_quals
);
11524 if (unqualified_id
&& TREE_CODE (unqualified_id
) == TEMPLATE_ID_EXPR
11525 && TREE_CODE (type
) != FUNCTION_TYPE
11526 && TREE_CODE (type
) != METHOD_TYPE
11527 && !variable_template_p (TREE_OPERAND (unqualified_id
, 0)))
11529 error ("template-id %qD used as a declarator",
11531 unqualified_id
= dname
;
11534 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
11535 qualified with a class-name, turn it into a METHOD_TYPE, unless
11536 we know that the function is static. We take advantage of this
11537 opportunity to do other processing that pertains to entities
11538 explicitly declared to be class members. Note that if DECLARATOR
11539 is non-NULL, we know it is a cdk_id declarator; otherwise, we
11540 would not have exited the loop above. */
11542 && declarator
->kind
== cdk_id
11543 && declarator
->u
.id
.qualifying_scope
11544 && MAYBE_CLASS_TYPE_P (declarator
->u
.id
.qualifying_scope
))
11546 ctype
= declarator
->u
.id
.qualifying_scope
;
11547 ctype
= TYPE_MAIN_VARIANT (ctype
);
11548 template_count
= num_template_headers_for_class (ctype
);
11550 if (ctype
== current_class_type
)
11554 permerror (input_location
, "member functions are implicitly "
11555 "friends of their class");
11559 permerror (declarator
->id_loc
,
11560 "extra qualification %<%T::%> on member %qs",
11563 else if (/* If the qualifying type is already complete, then we
11564 can skip the following checks. */
11565 !COMPLETE_TYPE_P (ctype
)
11566 && (/* If the function is being defined, then
11567 qualifying type must certainly be complete. */
11569 /* A friend declaration of "T::f" is OK, even if
11570 "T" is a template parameter. But, if this
11571 function is not a friend, the qualifying type
11572 must be a class. */
11573 || (!friendp
&& !CLASS_TYPE_P (ctype
))
11574 /* For a declaration, the type need not be
11575 complete, if either it is dependent (since there
11576 is no meaningful definition of complete in that
11577 case) or the qualifying class is currently being
11579 || !(dependent_type_p (ctype
)
11580 || currently_open_class (ctype
)))
11581 /* Check that the qualifying type is complete. */
11582 && !complete_type_or_else (ctype
, NULL_TREE
))
11583 return error_mark_node
;
11584 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
11586 if (current_class_type
11587 && (!friendp
|| funcdef_flag
|| initialized
))
11589 error (funcdef_flag
|| initialized
11590 ? G_("cannot define member function %<%T::%s%> "
11592 : G_("cannot declare member function %<%T::%s%> "
11594 ctype
, name
, current_class_type
);
11595 return error_mark_node
;
11598 else if (typedef_p
&& current_class_type
)
11600 error ("cannot declare member %<%T::%s%> within %qT",
11601 ctype
, name
, current_class_type
);
11602 return error_mark_node
;
11606 if (ctype
== NULL_TREE
&& decl_context
== FIELD
&& friendp
== 0)
11607 ctype
= current_class_type
;
11609 /* Now TYPE has the actual type. */
11611 if (returned_attrs
)
11614 *attrlist
= chainon (returned_attrs
, *attrlist
);
11616 attrlist
= &returned_attrs
;
11620 && declarator
->kind
== cdk_id
11621 && declarator
->std_attributes
11622 && attrlist
!= NULL
)
11624 /* [dcl.meaning]/1: The optional attribute-specifier-seq following
11625 a declarator-id appertains to the entity that is declared. */
11626 if (declarator
->std_attributes
!= error_mark_node
)
11627 *attrlist
= chainon (*attrlist
, declarator
->std_attributes
);
11629 /* We should have already diagnosed the issue (c++/78344). */
11630 gcc_assert (seen_error ());
11633 /* Handle parameter packs. */
11634 if (parameter_pack_p
)
11636 if (decl_context
== PARM
)
11637 /* Turn the type into a pack expansion.*/
11638 type
= make_pack_expansion (type
);
11640 error ("non-parameter %qs cannot be a parameter pack", name
);
11643 if ((decl_context
== FIELD
|| decl_context
== PARM
)
11644 && !processing_template_decl
11645 && variably_modified_type_p (type
, NULL_TREE
))
11647 if (decl_context
== FIELD
)
11648 error ("data member may not have variably modified type %qT", type
);
11650 error ("parameter may not have variably modified type %qT", type
);
11651 type
= error_mark_node
;
11654 if (explicitp
== 1 || (explicitp
&& friendp
))
11656 /* [dcl.fct.spec] (C++11) The explicit specifier shall be used only
11657 in the declaration of a constructor or conversion function within
11658 a class definition. */
11659 if (!current_class_type
)
11660 error_at (declspecs
->locations
[ds_explicit
],
11661 "%<explicit%> outside class declaration");
11663 error_at (declspecs
->locations
[ds_explicit
],
11664 "%<explicit%> in friend declaration");
11666 error_at (declspecs
->locations
[ds_explicit
],
11667 "only declarations of constructors and conversion operators "
11668 "can be %<explicit%>");
11672 if (storage_class
== sc_mutable
)
11674 if (decl_context
!= FIELD
|| friendp
)
11676 error ("non-member %qs cannot be declared %<mutable%>", name
);
11677 storage_class
= sc_none
;
11679 else if (decl_context
== TYPENAME
|| typedef_p
)
11681 error ("non-object member %qs cannot be declared %<mutable%>", name
);
11682 storage_class
= sc_none
;
11684 else if (TREE_CODE (type
) == FUNCTION_TYPE
11685 || TREE_CODE (type
) == METHOD_TYPE
)
11687 error ("function %qs cannot be declared %<mutable%>", name
);
11688 storage_class
= sc_none
;
11692 error ("static %qs cannot be declared %<mutable%>", name
);
11693 storage_class
= sc_none
;
11695 else if (type_quals
& TYPE_QUAL_CONST
)
11697 error ("const %qs cannot be declared %<mutable%>", name
);
11698 storage_class
= sc_none
;
11700 else if (TREE_CODE (type
) == REFERENCE_TYPE
)
11702 permerror (input_location
, "reference %qs cannot be declared "
11703 "%<mutable%>", name
);
11704 storage_class
= sc_none
;
11708 /* If this is declaring a typedef name, return a TYPE_DECL. */
11709 if (typedef_p
&& decl_context
!= TYPENAME
)
11713 /* This declaration:
11715 typedef void f(int) const;
11717 declares a function type which is not a member of any
11718 particular class, but which is cv-qualified; for
11719 example "f S::*" declares a pointer to a const-qualified
11720 member function of S. We record the cv-qualification in the
11722 if ((rqual
|| memfn_quals
) && TREE_CODE (type
) == FUNCTION_TYPE
)
11724 type
= apply_memfn_quals (type
, memfn_quals
, rqual
);
11726 /* We have now dealt with these qualifiers. */
11727 memfn_quals
= TYPE_UNQUALIFIED
;
11728 rqual
= REF_QUAL_NONE
;
11731 if (type_uses_auto (type
))
11733 error ("typedef declared %<auto%>");
11734 type
= error_mark_node
;
11738 error_at (location_of (reqs
), "requires-clause on typedef");
11740 if (decl_context
== FIELD
)
11741 decl
= build_lang_decl (TYPE_DECL
, unqualified_id
, type
);
11743 decl
= build_decl (input_location
, TYPE_DECL
, unqualified_id
, type
);
11744 if (id_declarator
&& declarator
->u
.id
.qualifying_scope
) {
11745 error_at (DECL_SOURCE_LOCATION (decl
),
11746 "typedef name may not be a nested-name-specifier");
11747 TREE_TYPE (decl
) = error_mark_node
;
11750 if (decl_context
!= FIELD
)
11752 if (!current_function_decl
)
11753 DECL_CONTEXT (decl
) = FROB_CONTEXT (current_namespace
);
11754 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl
)
11755 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
11756 (current_function_decl
)))
11757 /* The TYPE_DECL is "abstract" because there will be
11758 clones of this constructor/destructor, and there will
11759 be copies of this TYPE_DECL generated in those
11760 clones. The decloning optimization (for space) may
11761 revert this subsequently if it determines that
11762 the clones should share a common implementation. */
11763 DECL_ABSTRACT_P (decl
) = true;
11765 else if (current_class_type
11766 && constructor_name_p (unqualified_id
, current_class_type
))
11767 permerror (input_location
, "ISO C++ forbids nested type %qD with same name "
11768 "as enclosing class",
11771 /* If the user declares "typedef struct {...} foo" then the
11772 struct will have an anonymous name. Fill that name in now.
11773 Nothing can refer to it, so nothing needs know about the name
11775 if (type
!= error_mark_node
11777 && TYPE_NAME (type
)
11778 && TREE_CODE (TYPE_NAME (type
)) == TYPE_DECL
11779 && TYPE_UNNAMED_P (type
)
11780 && declspecs
->type_definition_p
11781 && attributes_naming_typedef_ok (*attrlist
)
11782 && cp_type_quals (type
) == TYPE_UNQUALIFIED
)
11783 name_unnamed_type (type
, decl
);
11786 || (typedef_decl
&& C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
)))
11787 C_TYPEDEF_EXPLICITLY_SIGNED (decl
) = 1;
11789 bad_specifiers (decl
, BSP_TYPE
, virtualp
,
11790 memfn_quals
!= TYPE_UNQUALIFIED
,
11791 inlinep
, friendp
, raises
!= NULL_TREE
);
11793 if (decl_spec_seq_has_spec_p (declspecs
, ds_alias
))
11794 /* Acknowledge that this was written:
11795 `using analias = atype;'. */
11796 TYPE_DECL_ALIAS_P (decl
) = 1;
11801 /* Detect the case of an array type of unspecified size
11802 which came, as such, direct from a typedef name.
11803 We must copy the type, so that the array's domain can be
11804 individually set by the object's initializer. */
11806 if (type
&& typedef_type
11807 && TREE_CODE (type
) == ARRAY_TYPE
&& !TYPE_DOMAIN (type
)
11808 && TYPE_MAIN_VARIANT (type
) == TYPE_MAIN_VARIANT (typedef_type
))
11809 type
= build_cplus_array_type (TREE_TYPE (type
), NULL_TREE
);
11811 /* Detect where we're using a typedef of function type to declare a
11812 function. PARMS will not be set, so we must create it now. */
11814 if (type
== typedef_type
&& TREE_CODE (type
) == FUNCTION_TYPE
)
11816 tree decls
= NULL_TREE
;
11819 for (args
= TYPE_ARG_TYPES (type
);
11820 args
&& args
!= void_list_node
;
11821 args
= TREE_CHAIN (args
))
11823 tree decl
= cp_build_parm_decl (NULL_TREE
, NULL_TREE
,
11824 TREE_VALUE (args
));
11826 DECL_CHAIN (decl
) = decls
;
11830 parms
= nreverse (decls
);
11832 if (decl_context
!= TYPENAME
)
11834 /* The qualifiers on the function type become the qualifiers on
11835 the non-static member function. */
11836 memfn_quals
|= type_memfn_quals (type
);
11837 rqual
= type_memfn_rqual (type
);
11838 type_quals
= TYPE_UNQUALIFIED
;
11842 /* If this is a type name (such as, in a cast or sizeof),
11843 compute the type and return it now. */
11845 if (decl_context
== TYPENAME
)
11847 /* Note that here we don't care about type_quals. */
11849 /* Special case: "friend class foo" looks like a TYPENAME context. */
11854 error ("%<inline%> specified for friend class declaration");
11860 /* Don't allow friend declaration without a class-key. */
11861 if (TREE_CODE (type
) == TEMPLATE_TYPE_PARM
)
11862 permerror (input_location
, "template parameters cannot be friends");
11863 else if (TREE_CODE (type
) == TYPENAME_TYPE
)
11864 permerror (input_location
, "friend declaration requires class-key, "
11865 "i.e. %<friend class %T::%D%>",
11866 TYPE_CONTEXT (type
), TYPENAME_TYPE_FULLNAME (type
));
11868 permerror (input_location
, "friend declaration requires class-key, "
11869 "i.e. %<friend %#T%>",
11873 /* Only try to do this stuff if we didn't already give up. */
11874 if (type
!= integer_type_node
)
11876 /* A friendly class? */
11877 if (current_class_type
)
11878 make_friend_class (current_class_type
, TYPE_MAIN_VARIANT (type
),
11879 /*complain=*/true);
11881 error ("trying to make class %qT a friend of global scope",
11884 type
= void_type_node
;
11887 else if (memfn_quals
|| rqual
)
11889 if (ctype
== NULL_TREE
11890 && TREE_CODE (type
) == METHOD_TYPE
)
11891 ctype
= TYPE_METHOD_BASETYPE (type
);
11894 type
= build_memfn_type (type
, ctype
, memfn_quals
, rqual
);
11895 /* Core issue #547: need to allow this in template type args.
11896 Allow it in general in C++11 for alias-declarations. */
11897 else if ((template_type_arg
|| cxx_dialect
>= cxx11
)
11898 && TREE_CODE (type
) == FUNCTION_TYPE
)
11899 type
= apply_memfn_quals (type
, memfn_quals
, rqual
);
11901 error ("invalid qualifiers on non-member function type");
11905 error_at (location_of (reqs
), "requires-clause on type-id");
11909 else if (unqualified_id
== NULL_TREE
&& decl_context
!= PARM
11910 && decl_context
!= CATCHPARM
11911 && TREE_CODE (type
) != UNION_TYPE
11913 && innermost_code
!= cdk_decomp
)
11915 error ("abstract declarator %qT used as declaration", type
);
11916 return error_mark_node
;
11919 if (!FUNC_OR_METHOD_TYPE_P (type
))
11921 /* Only functions may be declared using an operator-function-id. */
11922 if (dname
&& IDENTIFIER_ANY_OP_P (dname
))
11924 error ("declaration of %qD as non-function", dname
);
11925 return error_mark_node
;
11929 error_at (location_of (reqs
),
11930 "requires-clause on declaration of non-function type %qT",
11934 /* We don't check parameter types here because we can emit a better
11935 error message later. */
11936 if (decl_context
!= PARM
)
11938 type
= check_var_type (unqualified_id
, type
);
11939 if (type
== error_mark_node
)
11940 return error_mark_node
;
11943 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
11944 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
11946 if (decl_context
== PARM
|| decl_context
== CATCHPARM
)
11948 if (ctype
|| in_namespace
)
11949 error ("cannot use %<::%> in parameter declaration");
11951 if (type_uses_auto (type
)
11952 && !(cxx_dialect
>= cxx17
&& template_parm_flag
))
11954 if (cxx_dialect
>= cxx14
)
11955 error ("%<auto%> parameter not permitted in this context");
11957 error ("parameter declared %<auto%>");
11958 type
= error_mark_node
;
11961 /* A parameter declared as an array of T is really a pointer to T.
11962 One declared as a function is really a pointer to a function.
11963 One declared as a member is really a pointer to member. */
11965 if (TREE_CODE (type
) == ARRAY_TYPE
)
11967 /* Transfer const-ness of array into that of type pointed to. */
11968 type
= build_pointer_type (TREE_TYPE (type
));
11969 type_quals
= TYPE_UNQUALIFIED
;
11970 array_parameter_p
= true;
11972 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
11973 type
= build_pointer_type (type
);
11976 if (ctype
&& TREE_CODE (type
) == FUNCTION_TYPE
&& staticp
< 2
11977 && !(identifier_p (unqualified_id
)
11978 && IDENTIFIER_NEWDEL_OP_P (unqualified_id
)))
11980 cp_cv_quals real_quals
= memfn_quals
;
11981 if (cxx_dialect
< cxx14
&& constexpr_p
11982 && sfk
!= sfk_constructor
&& sfk
!= sfk_destructor
)
11983 real_quals
|= TYPE_QUAL_CONST
;
11984 type
= build_memfn_type (type
, ctype
, real_quals
, rqual
);
11988 tree decl
= NULL_TREE
;
11990 if (decl_context
== PARM
)
11992 decl
= cp_build_parm_decl (NULL_TREE
, unqualified_id
, type
);
11993 DECL_ARRAY_PARAMETER_P (decl
) = array_parameter_p
;
11995 bad_specifiers (decl
, BSP_PARM
, virtualp
,
11996 memfn_quals
!= TYPE_UNQUALIFIED
,
11997 inlinep
, friendp
, raises
!= NULL_TREE
);
11999 else if (decl_context
== FIELD
)
12001 if (!staticp
&& !friendp
&& TREE_CODE (type
) != METHOD_TYPE
)
12002 if (tree auto_node
= type_uses_auto (type
))
12004 location_t loc
= declspecs
->locations
[ds_type_spec
];
12005 if (CLASS_PLACEHOLDER_TEMPLATE (auto_node
))
12006 error_at (loc
, "invalid use of template-name %qE without an "
12008 CLASS_PLACEHOLDER_TEMPLATE (auto_node
));
12010 error_at (loc
, "non-static data member declared with "
12011 "placeholder %qT", auto_node
);
12012 type
= error_mark_node
;
12015 /* The C99 flexible array extension. */
12016 if (!staticp
&& TREE_CODE (type
) == ARRAY_TYPE
12017 && TYPE_DOMAIN (type
) == NULL_TREE
)
12020 && (TREE_CODE (ctype
) == UNION_TYPE
12021 || TREE_CODE (ctype
) == QUAL_UNION_TYPE
))
12023 error ("flexible array member in union");
12024 type
= error_mark_node
;
12028 /* Array is a flexible member. */
12029 if (in_system_header_at (input_location
))
12030 /* Do not warn on flexible array members in system
12031 headers because glibc uses them. */;
12033 pedwarn (input_location
, OPT_Wpedantic
,
12034 "ISO C++ forbids flexible array member %qs", name
);
12036 pedwarn (input_location
, OPT_Wpedantic
,
12037 "ISO C++ forbids flexible array members");
12039 /* Flexible array member has a null domain. */
12040 type
= build_cplus_array_type (TREE_TYPE (type
), NULL_TREE
);
12044 if (type
== error_mark_node
)
12046 /* Happens when declaring arrays of sizes which
12047 are error_mark_node, for example. */
12050 else if (in_namespace
&& !friendp
)
12052 /* Something like struct S { int N::j; }; */
12053 error ("invalid use of %<::%>");
12054 return error_mark_node
;
12056 else if (TREE_CODE (type
) == FUNCTION_TYPE
12057 || TREE_CODE (type
) == METHOD_TYPE
)
12060 tree function_context
;
12064 /* This should never happen in pure C++ (the check
12065 could be an assert). It could happen in
12066 Objective-C++ if someone writes invalid code that
12067 uses a function declaration for an instance
12068 variable or property (instance variables and
12069 properties are parsed as FIELD_DECLs, but they are
12070 part of an Objective-C class, not a C++ class).
12071 That code is invalid and is caught by this
12075 error ("declaration of function %qD in invalid context",
12077 return error_mark_node
;
12080 /* ``A union may [ ... ] not [ have ] virtual functions.''
12082 if (virtualp
&& TREE_CODE (ctype
) == UNION_TYPE
)
12084 error ("function %qD declared %<virtual%> inside a union",
12086 return error_mark_node
;
12090 && identifier_p (unqualified_id
)
12091 && IDENTIFIER_NEWDEL_OP_P (unqualified_id
))
12093 error ("%qD cannot be declared %<virtual%>, since it "
12094 "is always static", unqualified_id
);
12099 /* Check that the name used for a destructor makes sense. */
12100 if (sfk
== sfk_destructor
)
12102 tree uqname
= id_declarator
->u
.id
.unqualified_name
;
12106 gcc_assert (friendp
);
12107 error ("expected qualified name in friend declaration "
12108 "for destructor %qD", uqname
);
12109 return error_mark_node
;
12112 if (!check_dtor_name (ctype
, TREE_OPERAND (uqname
, 0)))
12114 error ("declaration of %qD as member of %qT",
12116 return error_mark_node
;
12120 error ("a destructor cannot be %<concept%>");
12121 return error_mark_node
;
12125 error ("a destructor cannot be %<constexpr%>");
12126 return error_mark_node
;
12129 else if (sfk
== sfk_constructor
&& friendp
&& !ctype
)
12131 error ("expected qualified name in friend declaration "
12132 "for constructor %qD",
12133 id_declarator
->u
.id
.unqualified_name
);
12134 return error_mark_node
;
12136 if (sfk
== sfk_constructor
)
12139 error ("a constructor cannot be %<concept%>");
12140 return error_mark_node
;
12144 error ("a concept cannot be a member function");
12148 if (TREE_CODE (unqualified_id
) == TEMPLATE_ID_EXPR
)
12150 tree tmpl
= TREE_OPERAND (unqualified_id
, 0);
12151 if (variable_template_p (tmpl
))
12153 error ("specialization of variable template %qD "
12154 "declared as function", tmpl
);
12155 inform (DECL_SOURCE_LOCATION (tmpl
),
12156 "variable template declared here");
12157 return error_mark_node
;
12161 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
12162 function_context
= (ctype
!= NULL_TREE
) ?
12163 decl_function_context (TYPE_MAIN_DECL (ctype
)) : NULL_TREE
;
12164 publicp
= (! friendp
|| ! staticp
)
12165 && function_context
== NULL_TREE
;
12167 if (late_return_type_p
)
12168 TYPE_HAS_LATE_RETURN_TYPE (type
) = 1;
12170 decl
= grokfndecl (ctype
, type
,
12171 TREE_CODE (unqualified_id
) != TEMPLATE_ID_EXPR
12172 ? unqualified_id
: dname
,
12176 virtualp
, flags
, memfn_quals
, rqual
, raises
,
12177 friendp
? -1 : 0, friendp
, publicp
,
12178 inlinep
| (2 * constexpr_p
) | (4 * concept_p
),
12179 initialized
== SD_DELETED
, sfk
,
12180 funcdef_flag
, template_count
, in_namespace
,
12181 attrlist
, declarator
->id_loc
);
12182 decl
= set_virt_specifiers (decl
, virt_specifiers
);
12183 if (decl
== NULL_TREE
)
12184 return error_mark_node
;
12186 /* This clobbers the attrs stored in `decl' from `attrlist'. */
12187 /* The decl and setting of decl_attr is also turned off. */
12188 decl
= build_decl_attribute_variant (decl
, decl_attr
);
12191 /* [class.conv.ctor]
12193 A constructor declared without the function-specifier
12194 explicit that can be called with a single parameter
12195 specifies a conversion from the type of its first
12196 parameter to the type of its class. Such a constructor
12197 is called a converting constructor. */
12198 if (explicitp
== 2)
12199 DECL_NONCONVERTING_P (decl
) = 1;
12201 else if (!staticp
&& !dependent_type_p (type
)
12202 && !COMPLETE_TYPE_P (complete_type (type
))
12203 && (!complete_or_array_type_p (type
)
12204 || initialized
== 0))
12206 if (TREE_CODE (type
) != ARRAY_TYPE
12207 || !COMPLETE_TYPE_P (TREE_TYPE (type
)))
12209 if (unqualified_id
)
12211 error ("field %qD has incomplete type %qT",
12212 unqualified_id
, type
);
12213 cxx_incomplete_type_inform (strip_array_types (type
));
12216 error ("name %qT has incomplete type", type
);
12218 type
= error_mark_node
;
12226 error ("%qE is neither function nor member function; "
12227 "cannot be declared friend", unqualified_id
);
12228 return error_mark_node
;
12235 /* Friends are treated specially. */
12236 if (ctype
== current_class_type
)
12237 ; /* We already issued a permerror. */
12238 else if (decl
&& DECL_NAME (decl
))
12240 if (template_class_depth (current_class_type
) == 0)
12242 decl
= check_explicit_specialization
12243 (unqualified_id
, decl
, template_count
,
12244 2 * funcdef_flag
+ 4);
12245 if (decl
== error_mark_node
)
12246 return error_mark_node
;
12249 decl
= do_friend (ctype
, unqualified_id
, decl
,
12255 return error_mark_node
;
12258 /* Structure field. It may not be a function, except for C++. */
12260 if (decl
== NULL_TREE
)
12264 /* C++ allows static class members. All other work
12265 for this is done by grokfield. */
12266 decl
= build_lang_decl_loc (declarator
12267 ? declarator
->id_loc
12269 VAR_DECL
, unqualified_id
, type
);
12270 set_linkage_for_static_data_member (decl
);
12272 error ("static data member %qE declared %<concept%>",
12274 else if (constexpr_p
&& !initialized
)
12276 error ("%<constexpr%> static data member %qD must have an "
12277 "initializer", decl
);
12278 constexpr_p
= false;
12282 mark_inline_variable (decl
);
12284 if (!DECL_VAR_DECLARED_INLINE_P (decl
)
12285 && !(cxx_dialect
>= cxx17
&& constexpr_p
))
12286 /* Even if there is an in-class initialization, DECL
12287 is considered undefined until an out-of-class
12288 definition is provided, unless this is an inline
12290 DECL_EXTERNAL (decl
) = 1;
12294 CP_DECL_THREAD_LOCAL_P (decl
) = true;
12295 if (!processing_template_decl
)
12296 set_decl_tls_model (decl
, decl_default_tls_model (decl
));
12297 if (declspecs
->gnu_thread_keyword_p
)
12298 SET_DECL_GNU_TLS_P (decl
);
12304 error ("non-static data member %qE declared %<concept%>",
12306 else if (constexpr_p
)
12308 error ("non-static data member %qE declared %<constexpr%>",
12310 constexpr_p
= false;
12312 decl
= build_decl (input_location
,
12313 FIELD_DECL
, unqualified_id
, type
);
12314 DECL_NONADDRESSABLE_P (decl
) = bitfield
;
12315 if (bitfield
&& !unqualified_id
)
12317 TREE_NO_WARNING (decl
) = 1;
12318 DECL_PADDING_P (decl
) = 1;
12321 if (storage_class
== sc_mutable
)
12323 DECL_MUTABLE_P (decl
) = 1;
12324 storage_class
= sc_none
;
12329 /* An attempt is being made to initialize a non-static
12330 member. This is new in C++11. */
12331 maybe_warn_cpp0x (CPP0X_NSDMI
);
12333 /* If this has been parsed with static storage class, but
12334 errors forced staticp to be cleared, ensure NSDMI is
12336 if (declspecs
->storage_class
== sc_static
)
12337 DECL_INITIAL (decl
) = error_mark_node
;
12341 bad_specifiers (decl
, BSP_FIELD
, virtualp
,
12342 memfn_quals
!= TYPE_UNQUALIFIED
,
12343 staticp
? false : inlinep
, friendp
,
12344 raises
!= NULL_TREE
);
12347 else if (TREE_CODE (type
) == FUNCTION_TYPE
12348 || TREE_CODE (type
) == METHOD_TYPE
)
12350 tree original_name
;
12353 if (!unqualified_id
)
12354 return error_mark_node
;
12356 if (TREE_CODE (unqualified_id
) == TEMPLATE_ID_EXPR
)
12357 original_name
= dname
;
12359 original_name
= unqualified_id
;
12360 // FIXME:gcc_assert (original_name == dname);
12362 if (storage_class
== sc_auto
)
12363 error ("storage class %<auto%> invalid for function %qs", name
);
12364 else if (storage_class
== sc_register
)
12365 error ("storage class %<register%> invalid for function %qs", name
);
12368 if (declspecs
->gnu_thread_keyword_p
)
12369 error ("storage class %<__thread%> invalid for function %qs",
12372 error ("storage class %<thread_local%> invalid for function %qs",
12376 if (virt_specifiers
)
12377 error ("virt-specifiers in %qs not allowed outside a class definition", name
);
12378 /* Function declaration not at top level.
12379 Storage classes other than `extern' are not allowed
12380 and `extern' makes no difference. */
12381 if (! toplevel_bindings_p ()
12382 && (storage_class
== sc_static
12383 || decl_spec_seq_has_spec_p (declspecs
, ds_inline
))
12386 if (storage_class
== sc_static
)
12387 pedwarn (input_location
, OPT_Wpedantic
,
12388 "%<static%> specifier invalid for function %qs "
12389 "declared out of global scope", name
);
12391 pedwarn (input_location
, OPT_Wpedantic
,
12392 "%<inline%> specifier invalid for function %qs "
12393 "declared out of global scope", name
);
12396 if (ctype
== NULL_TREE
)
12400 error ("virtual non-class function %qs", name
);
12403 else if (sfk
== sfk_constructor
12404 || sfk
== sfk_destructor
)
12406 error (funcdef_flag
12407 ? G_("%qs defined in a non-class scope")
12408 : G_("%qs declared in a non-class scope"), name
);
12413 /* Record whether the function is public. */
12414 publicp
= (ctype
!= NULL_TREE
12415 || storage_class
!= sc_static
);
12417 if (late_return_type_p
)
12418 TYPE_HAS_LATE_RETURN_TYPE (type
) = 1;
12420 decl
= grokfndecl (ctype
, type
, original_name
, parms
, unqualified_id
,
12421 reqs
, virtualp
, flags
, memfn_quals
, rqual
, raises
,
12424 inlinep
| (2 * constexpr_p
) | (4 * concept_p
),
12425 initialized
== SD_DELETED
,
12428 template_count
, in_namespace
, attrlist
,
12429 declarator
->id_loc
);
12430 if (decl
== NULL_TREE
)
12431 return error_mark_node
;
12433 if (explicitp
== 2)
12434 DECL_NONCONVERTING_P (decl
) = 1;
12437 int invalid_static
= 0;
12439 /* Don't allow a static member function in a class, and forbid
12440 declaring main to be static. */
12441 if (TREE_CODE (type
) == METHOD_TYPE
)
12443 permerror (input_location
, "cannot declare member function %qD to have "
12444 "static linkage", decl
);
12445 invalid_static
= 1;
12447 else if (current_function_decl
)
12449 /* 7.1.1: There can be no static function declarations within a
12451 error ("cannot declare static function inside another function");
12452 invalid_static
= 1;
12455 if (invalid_static
)
12458 storage_class
= sc_none
;
12464 /* It's a variable. */
12466 /* An uninitialized decl with `extern' is a reference. */
12467 decl
= grokvardecl (type
, dname
, unqualified_id
,
12474 ctype
? ctype
: in_namespace
);
12475 if (decl
== NULL_TREE
)
12476 return error_mark_node
;
12478 bad_specifiers (decl
, BSP_VAR
, virtualp
,
12479 memfn_quals
!= TYPE_UNQUALIFIED
,
12480 inlinep
, friendp
, raises
!= NULL_TREE
);
12484 DECL_CONTEXT (decl
) = ctype
;
12487 permerror (input_location
, "%<static%> may not be used when defining "
12488 "(as opposed to declaring) a static data member");
12490 storage_class
= sc_none
;
12492 if (storage_class
== sc_register
&& TREE_STATIC (decl
))
12494 error ("static member %qD declared %<register%>", decl
);
12495 storage_class
= sc_none
;
12497 if (storage_class
== sc_extern
&& pedantic
)
12499 pedwarn (input_location
, OPT_Wpedantic
,
12500 "cannot explicitly declare member %q#D to have "
12501 "extern linkage", decl
);
12502 storage_class
= sc_none
;
12505 else if (constexpr_p
&& DECL_EXTERNAL (decl
))
12507 error ("declaration of %<constexpr%> variable %qD "
12508 "is not a definition", decl
);
12509 constexpr_p
= false;
12513 mark_inline_variable (decl
);
12514 if (innermost_code
== cdk_decomp
)
12516 gcc_assert (declarator
&& declarator
->kind
== cdk_decomp
);
12517 DECL_SOURCE_LOCATION (decl
) = declarator
->id_loc
;
12518 DECL_ARTIFICIAL (decl
) = 1;
12519 fit_decomposition_lang_decl (decl
, NULL_TREE
);
12523 if (VAR_P (decl
) && !initialized
)
12524 if (tree auto_node
= type_uses_auto (type
))
12525 if (!CLASS_PLACEHOLDER_TEMPLATE (auto_node
))
12527 location_t loc
= declspecs
->locations
[ds_type_spec
];
12528 error_at (loc
, "declaration of %q#D has no initializer", decl
);
12529 TREE_TYPE (decl
) = error_mark_node
;
12532 if (storage_class
== sc_extern
&& initialized
&& !funcdef_flag
)
12534 if (toplevel_bindings_p ())
12536 /* It's common practice (and completely valid) to have a const
12537 be initialized and declared extern. */
12538 if (!(type_quals
& TYPE_QUAL_CONST
))
12539 warning (0, "%qs initialized and declared %<extern%>", name
);
12543 error ("%qs has both %<extern%> and initializer", name
);
12544 return error_mark_node
;
12548 /* Record `register' declaration for warnings on &
12549 and in case doing stupid register allocation. */
12551 if (storage_class
== sc_register
)
12553 DECL_REGISTER (decl
) = 1;
12554 /* Warn about register storage specifiers on PARM_DECLs. */
12555 if (TREE_CODE (decl
) == PARM_DECL
)
12557 if (cxx_dialect
>= cxx17
)
12558 pedwarn (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
12559 "ISO C++17 does not allow %<register%> storage "
12560 "class specifier");
12562 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
12563 "%<register%> storage class specifier used");
12566 else if (storage_class
== sc_extern
)
12567 DECL_THIS_EXTERN (decl
) = 1;
12568 else if (storage_class
== sc_static
)
12569 DECL_THIS_STATIC (decl
) = 1;
12571 /* Set constexpr flag on vars (functions got it in grokfndecl). */
12572 if (constexpr_p
&& VAR_P (decl
))
12573 DECL_DECLARED_CONSTEXPR_P (decl
) = true;
12575 /* Record constancy and volatility on the DECL itself . There's
12576 no need to do this when processing a template; we'll do this
12577 for the instantiated declaration based on the type of DECL. */
12578 if (!processing_template_decl
)
12579 cp_apply_type_quals_to_decl (type_quals
, decl
);
12585 /* Subroutine of start_function. Ensure that each of the parameter
12586 types (as listed in PARMS) is complete, as is required for a
12587 function definition. */
12590 require_complete_types_for_parms (tree parms
)
12592 for (; parms
; parms
= DECL_CHAIN (parms
))
12594 if (dependent_type_p (TREE_TYPE (parms
)))
12596 if (!VOID_TYPE_P (TREE_TYPE (parms
))
12597 && complete_type_or_else (TREE_TYPE (parms
), parms
))
12599 relayout_decl (parms
);
12600 DECL_ARG_TYPE (parms
) = type_passed_as (TREE_TYPE (parms
));
12602 maybe_warn_parm_abi (TREE_TYPE (parms
),
12603 DECL_SOURCE_LOCATION (parms
));
12606 /* grokparms or complete_type_or_else will have already issued
12608 TREE_TYPE (parms
) = error_mark_node
;
12612 /* Returns nonzero if T is a local variable. */
12615 local_variable_p (const_tree t
)
12618 /* A VAR_DECL with a context that is a _TYPE is a static data
12620 && !TYPE_P (CP_DECL_CONTEXT (t
))
12621 /* Any other non-local variable must be at namespace scope. */
12622 && !DECL_NAMESPACE_SCOPE_P (t
))
12623 || (TREE_CODE (t
) == PARM_DECL
))
12629 /* Like local_variable_p, but suitable for use as a tree-walking
12633 local_variable_p_walkfn (tree
*tp
, int *walk_subtrees
,
12636 if (local_variable_p (*tp
)
12637 && (!DECL_ARTIFICIAL (*tp
) || DECL_NAME (*tp
) == this_identifier
))
12639 else if (TYPE_P (*tp
))
12640 *walk_subtrees
= 0;
12645 /* Check that ARG, which is a default-argument expression for a
12646 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
12647 something goes wrong. DECL may also be a _TYPE node, rather than a
12648 DECL, if there is no DECL available. */
12651 check_default_argument (tree decl
, tree arg
, tsubst_flags_t complain
)
12656 if (TREE_CODE (arg
) == DEFAULT_ARG
)
12657 /* We get a DEFAULT_ARG when looking at an in-class declaration
12658 with a default argument. Ignore the argument for now; we'll
12659 deal with it after the class is complete. */
12668 decl_type
= TREE_TYPE (decl
);
12670 if (arg
== error_mark_node
12671 || decl
== error_mark_node
12672 || TREE_TYPE (arg
) == error_mark_node
12673 || decl_type
== error_mark_node
)
12674 /* Something already went wrong. There's no need to check
12676 return error_mark_node
;
12678 /* [dcl.fct.default]
12680 A default argument expression is implicitly converted to the
12682 ++cp_unevaluated_operand
;
12683 /* Avoid digest_init clobbering the initializer. */
12684 tree carg
= BRACE_ENCLOSED_INITIALIZER_P (arg
) ? unshare_expr (arg
): arg
;
12685 perform_implicit_conversion_flags (decl_type
, carg
, complain
,
12687 --cp_unevaluated_operand
;
12689 /* Avoid redundant -Wzero-as-null-pointer-constant warnings at
12691 if (TYPE_PTR_OR_PTRMEM_P (decl_type
)
12692 && null_ptr_cst_p (arg
))
12693 return nullptr_node
;
12695 /* [dcl.fct.default]
12697 Local variables shall not be used in default argument
12700 The keyword `this' shall not be used in a default argument of a
12701 member function. */
12702 var
= cp_walk_tree_without_duplicates (&arg
, local_variable_p_walkfn
, NULL
);
12705 if (complain
& tf_warning_or_error
)
12707 if (DECL_NAME (var
) == this_identifier
)
12708 permerror (input_location
, "default argument %qE uses %qD",
12711 error ("default argument %qE uses local variable %qD", arg
, var
);
12713 return error_mark_node
;
12720 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
12723 type_is_deprecated (tree type
)
12725 enum tree_code code
;
12726 if (TREE_DEPRECATED (type
))
12728 if (TYPE_NAME (type
))
12730 if (TREE_DEPRECATED (TYPE_NAME (type
)))
12736 /* Do warn about using typedefs to a deprecated class. */
12737 if (OVERLOAD_TYPE_P (type
) && type
!= TYPE_MAIN_VARIANT (type
))
12738 return type_is_deprecated (TYPE_MAIN_VARIANT (type
));
12740 code
= TREE_CODE (type
);
12742 if (code
== POINTER_TYPE
|| code
== REFERENCE_TYPE
12743 || code
== OFFSET_TYPE
|| code
== FUNCTION_TYPE
12744 || code
== METHOD_TYPE
|| code
== ARRAY_TYPE
)
12745 return type_is_deprecated (TREE_TYPE (type
));
12747 if (TYPE_PTRMEMFUNC_P (type
))
12748 return type_is_deprecated
12749 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type
))));
12754 /* Decode the list of parameter types for a function type.
12755 Given the list of things declared inside the parens,
12756 return a list of types.
12758 If this parameter does not end with an ellipsis, we append
12761 *PARMS is set to the chain of PARM_DECLs created. */
12764 grokparms (tree parmlist
, tree
*parms
)
12766 tree result
= NULL_TREE
;
12767 tree decls
= NULL_TREE
;
12771 for (parm
= parmlist
; parm
!= NULL_TREE
; parm
= TREE_CHAIN (parm
))
12773 tree type
= NULL_TREE
;
12774 tree init
= TREE_PURPOSE (parm
);
12775 tree decl
= TREE_VALUE (parm
);
12777 if (parm
== void_list_node
)
12780 if (! decl
|| TREE_TYPE (decl
) == error_mark_node
)
12783 type
= TREE_TYPE (decl
);
12784 if (VOID_TYPE_P (type
))
12786 if (same_type_p (type
, void_type_node
)
12788 && !DECL_NAME (decl
) && !result
12789 && TREE_CHAIN (parm
) == void_list_node
)
12790 /* DR 577: A parameter list consisting of a single
12791 unnamed parameter of non-dependent type 'void'. */
12793 else if (cv_qualified_p (type
))
12794 error_at (DECL_SOURCE_LOCATION (decl
),
12795 "invalid use of cv-qualified type %qT in "
12796 "parameter declaration", type
);
12798 error_at (DECL_SOURCE_LOCATION (decl
),
12799 "invalid use of type %<void%> in parameter "
12801 /* It's not a good idea to actually create parameters of
12802 type `void'; other parts of the compiler assume that a
12803 void type terminates the parameter list. */
12804 type
= error_mark_node
;
12805 TREE_TYPE (decl
) = error_mark_node
;
12808 if (type
!= error_mark_node
)
12810 if (deprecated_state
!= DEPRECATED_SUPPRESS
)
12812 tree deptype
= type_is_deprecated (type
);
12814 cp_warn_deprecated_use (deptype
);
12817 /* Top-level qualifiers on the parameters are
12818 ignored for function types. */
12819 type
= cp_build_qualified_type (type
, 0);
12820 if (TREE_CODE (type
) == METHOD_TYPE
)
12822 error ("parameter %qD invalidly declared method type", decl
);
12823 type
= build_pointer_type (type
);
12824 TREE_TYPE (decl
) = type
;
12826 else if (abstract_virtuals_error (decl
, type
))
12827 any_error
= 1; /* Seems like a good idea. */
12828 else if (cxx_dialect
< cxx17
&& POINTER_TYPE_P (type
))
12830 /* Before C++17 DR 393:
12831 [dcl.fct]/6, parameter types cannot contain pointers
12832 (references) to arrays of unknown bound. */
12833 tree t
= TREE_TYPE (type
);
12834 int ptr
= TYPE_PTR_P (type
);
12838 if (TYPE_PTR_P (t
))
12840 else if (TREE_CODE (t
) != ARRAY_TYPE
)
12842 else if (!TYPE_DOMAIN (t
))
12846 if (TREE_CODE (t
) == ARRAY_TYPE
)
12847 pedwarn (DECL_SOURCE_LOCATION (decl
), OPT_Wpedantic
,
12849 ? G_("parameter %qD includes pointer to array of "
12850 "unknown bound %qT")
12851 : G_("parameter %qD includes reference to array of "
12852 "unknown bound %qT"),
12858 else if (init
&& !processing_template_decl
)
12859 init
= check_default_argument (decl
, init
, tf_warning_or_error
);
12862 DECL_CHAIN (decl
) = decls
;
12864 result
= tree_cons (init
, type
, result
);
12866 decls
= nreverse (decls
);
12867 result
= nreverse (result
);
12869 result
= chainon (result
, void_list_node
);
12876 /* D is a constructor or overloaded `operator='.
12878 Let T be the class in which D is declared. Then, this function
12881 -1 if D's is an ill-formed constructor or copy assignment operator
12882 whose first parameter is of type `T'.
12883 0 if D is not a copy constructor or copy assignment
12885 1 if D is a copy constructor or copy assignment operator whose
12886 first parameter is a reference to non-const qualified T.
12887 2 if D is a copy constructor or copy assignment operator whose
12888 first parameter is a reference to const qualified T.
12890 This function can be used as a predicate. Positive values indicate
12891 a copy constructor and nonzero values indicate a copy assignment
12895 copy_fn_p (const_tree d
)
12901 gcc_assert (DECL_FUNCTION_MEMBER_P (d
));
12903 if (TREE_CODE (d
) == TEMPLATE_DECL
12904 || (DECL_TEMPLATE_INFO (d
)
12905 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d
))))
12906 /* Instantiations of template member functions are never copy
12907 functions. Note that member functions of templated classes are
12908 represented as template functions internally, and we must
12909 accept those as copy functions. */
12912 args
= FUNCTION_FIRST_USER_PARMTYPE (d
);
12916 arg_type
= TREE_VALUE (args
);
12917 if (arg_type
== error_mark_node
)
12920 if (TYPE_MAIN_VARIANT (arg_type
) == DECL_CONTEXT (d
))
12922 /* Pass by value copy assignment operator. */
12925 else if (TREE_CODE (arg_type
) == REFERENCE_TYPE
12926 && !TYPE_REF_IS_RVALUE (arg_type
)
12927 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type
)) == DECL_CONTEXT (d
))
12929 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type
)))
12935 args
= TREE_CHAIN (args
);
12937 if (args
&& args
!= void_list_node
&& !TREE_PURPOSE (args
))
12938 /* There are more non-optional args. */
12944 /* D is a constructor or overloaded `operator='.
12946 Let T be the class in which D is declared. Then, this function
12947 returns true when D is a move constructor or move assignment
12948 operator, false otherwise. */
12951 move_fn_p (const_tree d
)
12953 gcc_assert (DECL_FUNCTION_MEMBER_P (d
));
12955 if (cxx_dialect
== cxx98
)
12956 /* There are no move constructors if we are in C++98 mode. */
12959 if (TREE_CODE (d
) == TEMPLATE_DECL
12960 || (DECL_TEMPLATE_INFO (d
)
12961 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d
))))
12962 /* Instantiations of template member functions are never move
12963 functions. Note that member functions of templated classes are
12964 represented as template functions internally, and we must
12965 accept those as move functions. */
12968 return move_signature_fn_p (d
);
12971 /* D is a constructor or overloaded `operator='.
12973 Then, this function returns true when D has the same signature as a move
12974 constructor or move assignment operator (because either it is such a
12975 ctor/op= or it is a template specialization with the same signature),
12976 false otherwise. */
12979 move_signature_fn_p (const_tree d
)
12983 bool result
= false;
12985 args
= FUNCTION_FIRST_USER_PARMTYPE (d
);
12989 arg_type
= TREE_VALUE (args
);
12990 if (arg_type
== error_mark_node
)
12993 if (TREE_CODE (arg_type
) == REFERENCE_TYPE
12994 && TYPE_REF_IS_RVALUE (arg_type
)
12995 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type
)),
12999 args
= TREE_CHAIN (args
);
13001 if (args
&& args
!= void_list_node
&& !TREE_PURPOSE (args
))
13002 /* There are more non-optional args. */
13008 /* Remember any special properties of member function DECL. */
13011 grok_special_member_properties (tree decl
)
13015 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl
))
13018 class_type
= DECL_CONTEXT (decl
);
13019 if (IDENTIFIER_CTOR_P (DECL_NAME (decl
)))
13021 int ctor
= copy_fn_p (decl
);
13023 if (!DECL_ARTIFICIAL (decl
))
13024 TYPE_HAS_USER_CONSTRUCTOR (class_type
) = 1;
13030 A non-template constructor for class X is a copy
13031 constructor if its first parameter is of type X&, const
13032 X&, volatile X& or const volatile X&, and either there
13033 are no other parameters or else all other parameters have
13034 default arguments. */
13035 TYPE_HAS_COPY_CTOR (class_type
) = 1;
13036 if (user_provided_p (decl
))
13037 TYPE_HAS_COMPLEX_COPY_CTOR (class_type
) = 1;
13039 TYPE_HAS_CONST_COPY_CTOR (class_type
) = 1;
13041 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl
)))
13042 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type
) = 1;
13043 else if (move_fn_p (decl
) && user_provided_p (decl
))
13044 TYPE_HAS_COMPLEX_MOVE_CTOR (class_type
) = 1;
13045 else if (is_list_ctor (decl
))
13046 TYPE_HAS_LIST_CTOR (class_type
) = 1;
13048 if (DECL_DECLARED_CONSTEXPR_P (decl
)
13049 && !ctor
&& !move_fn_p (decl
))
13050 TYPE_HAS_CONSTEXPR_CTOR (class_type
) = 1;
13052 else if (DECL_NAME (decl
) == assign_op_identifier
)
13056 A non-template assignment operator for class X is a copy
13057 assignment operator if its parameter is of type X, X&, const
13058 X&, volatile X& or const volatile X&. */
13060 int assop
= copy_fn_p (decl
);
13064 TYPE_HAS_COPY_ASSIGN (class_type
) = 1;
13065 if (user_provided_p (decl
))
13066 TYPE_HAS_COMPLEX_COPY_ASSIGN (class_type
) = 1;
13068 TYPE_HAS_CONST_COPY_ASSIGN (class_type
) = 1;
13070 else if (move_fn_p (decl
) && user_provided_p (decl
))
13071 TYPE_HAS_COMPLEX_MOVE_ASSIGN (class_type
) = 1;
13073 else if (IDENTIFIER_CONV_OP_P (DECL_NAME (decl
)))
13074 TYPE_HAS_CONVERSION (class_type
) = true;
13076 /* Destructors are handled in check_methods. */
13079 /* Check a constructor DECL has the correct form. Complains
13080 if the class has a constructor of the form X(X). */
13083 grok_ctor_properties (const_tree ctype
, const_tree decl
)
13085 int ctor_parm
= copy_fn_p (decl
);
13091 A declaration of a constructor for a class X is ill-formed if
13092 its first parameter is of type (optionally cv-qualified) X
13093 and either there are no other parameters or else all other
13094 parameters have default arguments.
13096 We *don't* complain about member template instantiations that
13097 have this form, though; they can occur as we try to decide
13098 what constructor to use during overload resolution. Since
13099 overload resolution will never prefer such a constructor to
13100 the non-template copy constructor (which is either explicitly
13101 or implicitly defined), there's no need to worry about their
13102 existence. Theoretically, they should never even be
13103 instantiated, but that's hard to forestall. */
13104 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
13112 /* DECL is a declaration for an overloaded or conversion operator. If
13113 COMPLAIN is true, errors are issued for invalid declarations. */
13116 grok_op_properties (tree decl
, bool complain
)
13118 tree argtypes
= TYPE_ARG_TYPES (TREE_TYPE (decl
));
13119 bool methodp
= TREE_CODE (TREE_TYPE (decl
)) == METHOD_TYPE
;
13120 tree name
= DECL_NAME (decl
);
13122 tree class_type
= DECL_CONTEXT (decl
);
13123 if (class_type
&& !CLASS_TYPE_P (class_type
))
13124 class_type
= NULL_TREE
;
13126 tree_code operator_code
;
13128 if (IDENTIFIER_CONV_OP_P (name
))
13130 /* Conversion operators are TYPE_EXPR for the purposes of this
13132 operator_code
= TYPE_EXPR
;
13133 op_flags
= OVL_OP_FLAG_UNARY
;
13137 const ovl_op_info_t
*ovl_op
= IDENTIFIER_OVL_OP_INFO (name
);
13139 operator_code
= ovl_op
->tree_code
;
13140 op_flags
= ovl_op
->flags
;
13141 gcc_checking_assert (operator_code
!= ERROR_MARK
);
13142 DECL_OVERLOADED_OPERATOR_CODE_RAW (decl
) = ovl_op
->ovl_op_code
;
13145 if (op_flags
& OVL_OP_FLAG_ALLOC
)
13147 /* operator new and operator delete are quite special. */
13151 case OVL_OP_FLAG_ALLOC
:
13152 TYPE_HAS_NEW_OPERATOR (class_type
) = 1;
13155 case OVL_OP_FLAG_ALLOC
| OVL_OP_FLAG_DELETE
:
13156 TYPE_GETS_DELETE (class_type
) |= 1;
13159 case OVL_OP_FLAG_ALLOC
| OVL_OP_FLAG_VEC
:
13160 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type
) = 1;
13163 case OVL_OP_FLAG_ALLOC
| OVL_OP_FLAG_DELETE
| OVL_OP_FLAG_VEC
:
13164 TYPE_GETS_DELETE (class_type
) |= 2;
13168 gcc_unreachable ();
13171 /* [basic.std.dynamic.allocation]/1:
13173 A program is ill-formed if an allocation function is declared
13174 in a namespace scope other than global scope or declared
13175 static in global scope.
13177 The same also holds true for deallocation functions. */
13178 if (DECL_NAMESPACE_SCOPE_P (decl
))
13180 if (CP_DECL_CONTEXT (decl
) != global_namespace
)
13182 error ("%qD may not be declared within a namespace", decl
);
13186 if (!TREE_PUBLIC (decl
))
13188 error ("%qD may not be declared as static", decl
);
13193 if (op_flags
& OVL_OP_FLAG_DELETE
)
13194 TREE_TYPE (decl
) = coerce_delete_type (TREE_TYPE (decl
));
13197 DECL_IS_OPERATOR_NEW (decl
) = 1;
13198 TREE_TYPE (decl
) = coerce_new_type (TREE_TYPE (decl
));
13204 /* An operator function must either be a non-static member function
13205 or have at least one parameter of a class, a reference to a class,
13206 an enumeration, or a reference to an enumeration. 13.4.0.6 */
13207 if (! methodp
|| DECL_STATIC_FUNCTION_P (decl
))
13209 if (operator_code
== TYPE_EXPR
13210 || operator_code
== CALL_EXPR
13211 || operator_code
== COMPONENT_REF
13212 || operator_code
== ARRAY_REF
13213 || operator_code
== NOP_EXPR
)
13215 error ("%qD must be a nonstatic member function", decl
);
13219 if (DECL_STATIC_FUNCTION_P (decl
))
13221 error ("%qD must be either a non-static member "
13222 "function or a non-member function", decl
);
13226 for (tree arg
= argtypes
; ; arg
= TREE_CHAIN (arg
))
13228 if (!arg
|| arg
== void_list_node
)
13231 error ("%qD must have an argument of class or "
13232 "enumerated type", decl
);
13236 tree type
= non_reference (TREE_VALUE (arg
));
13237 if (type
== error_mark_node
)
13240 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
13241 because these checks are performed even on template
13243 if (MAYBE_CLASS_TYPE_P (type
)
13244 || TREE_CODE (type
) == ENUMERAL_TYPE
)
13249 if (operator_code
== CALL_EXPR
)
13250 /* There are no further restrictions on the arguments to an overloaded
13254 if (operator_code
== COND_EXPR
)
13257 error ("ISO C++ prohibits overloading operator ?:");
13261 /* Count the number of arguments and check for ellipsis. */
13263 for (tree arg
= argtypes
; arg
!= void_list_node
; arg
= TREE_CHAIN (arg
))
13268 error ("%qD must not have variable number of arguments", decl
);
13274 /* Verify correct number of arguments. */
13277 case OVL_OP_FLAG_AMBIARY
:
13280 /* We have a unary instance of an ambi-ary op. Remap to the
13282 unsigned alt
= ovl_op_alternate
[ovl_op_mapping
[operator_code
]];
13283 const ovl_op_info_t
*ovl_op
= &ovl_op_info
[false][alt
];
13284 gcc_checking_assert (ovl_op
->flags
== OVL_OP_FLAG_UNARY
);
13285 operator_code
= ovl_op
->tree_code
;
13286 DECL_OVERLOADED_OPERATOR_CODE_RAW (decl
) = ovl_op
->ovl_op_code
;
13288 else if (arity
!= 2)
13290 /* This was an ambiguous operator but is invalid. */
13292 ? G_("%qD must have either zero or one argument")
13293 : G_("%qD must have either one or two arguments"), decl
);
13296 else if ((operator_code
== POSTINCREMENT_EXPR
13297 || operator_code
== POSTDECREMENT_EXPR
)
13298 && ! processing_template_decl
13299 /* x++ and x--'s second argument must be an int. */
13300 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes
)),
13301 integer_type_node
))
13304 ? G_("postfix %qD must have %<int%> as its argument")
13305 : G_("postfix %qD must have %<int%> as its second argument"),
13311 case OVL_OP_FLAG_UNARY
:
13315 ? G_("%qD must have no arguments")
13316 : G_("%qD must have exactly one argument"), decl
);
13321 case OVL_OP_FLAG_BINARY
:
13325 ? G_("%qD must have exactly one argument")
13326 : G_("%qD must have exactly two arguments"), decl
);
13332 gcc_unreachable ();
13335 /* There can be no default arguments. */
13336 for (tree arg
= argtypes
; arg
!= void_list_node
; arg
= TREE_CHAIN (arg
))
13337 if (TREE_PURPOSE (arg
))
13339 TREE_PURPOSE (arg
) = NULL_TREE
;
13340 if (operator_code
== POSTINCREMENT_EXPR
13341 || operator_code
== POSTDECREMENT_EXPR
)
13342 pedwarn (input_location
, OPT_Wpedantic
,
13343 "%qD cannot have default arguments", decl
);
13346 error ("%qD cannot have default arguments", decl
);
13351 /* At this point the declaration is well-formed. It may not be
13352 sensible though. */
13354 /* Check member function warnings only on the in-class declaration.
13355 There's no point warning on an out-of-class definition. */
13356 if (class_type
&& class_type
!= current_class_type
)
13359 /* Warn about conversion operators that will never be used. */
13360 if (IDENTIFIER_CONV_OP_P (name
)
13361 && ! DECL_TEMPLATE_INFO (decl
)
13362 && warn_conversion
)
13364 tree t
= TREE_TYPE (name
);
13365 int ref
= (TREE_CODE (t
) == REFERENCE_TYPE
);
13368 t
= TYPE_MAIN_VARIANT (TREE_TYPE (t
));
13370 if (VOID_TYPE_P (t
))
13371 warning (OPT_Wconversion
,
13373 ? G_("conversion to a reference to void "
13374 "will never use a type conversion operator")
13375 : G_("conversion to void "
13376 "will never use a type conversion operator"));
13377 else if (class_type
)
13379 if (t
== class_type
)
13380 warning (OPT_Wconversion
,
13382 ? G_("conversion to a reference to the same type "
13383 "will never use a type conversion operator")
13384 : G_("conversion to the same type "
13385 "will never use a type conversion operator"));
13386 /* Don't force t to be complete here. */
13387 else if (MAYBE_CLASS_TYPE_P (t
)
13388 && COMPLETE_TYPE_P (t
)
13389 && DERIVED_FROM_P (t
, class_type
))
13390 warning (OPT_Wconversion
,
13392 ? G_("conversion to a reference to a base class "
13393 "will never use a type conversion operator")
13394 : G_("conversion to a base class "
13395 "will never use a type conversion operator"));
13402 /* Effective C++ rules below. */
13404 /* More Effective C++ rule 7. */
13405 if (operator_code
== TRUTH_ANDIF_EXPR
13406 || operator_code
== TRUTH_ORIF_EXPR
13407 || operator_code
== COMPOUND_EXPR
)
13408 warning (OPT_Weffc__
,
13409 "user-defined %qD always evaluates both arguments", decl
);
13411 /* More Effective C++ rule 6. */
13412 if (operator_code
== POSTINCREMENT_EXPR
13413 || operator_code
== POSTDECREMENT_EXPR
13414 || operator_code
== PREINCREMENT_EXPR
13415 || operator_code
== PREDECREMENT_EXPR
)
13417 tree arg
= TREE_VALUE (argtypes
);
13418 tree ret
= TREE_TYPE (TREE_TYPE (decl
));
13419 if (methodp
|| TREE_CODE (arg
) == REFERENCE_TYPE
)
13420 arg
= TREE_TYPE (arg
);
13421 arg
= TYPE_MAIN_VARIANT (arg
);
13423 if (operator_code
== PREINCREMENT_EXPR
13424 || operator_code
== PREDECREMENT_EXPR
)
13426 if (TREE_CODE (ret
) != REFERENCE_TYPE
13427 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret
)), arg
))
13428 warning (OPT_Weffc__
, "prefix %qD should return %qT", decl
,
13429 build_reference_type (arg
));
13433 if (!same_type_p (TYPE_MAIN_VARIANT (ret
), arg
))
13434 warning (OPT_Weffc__
, "postfix %qD should return %qT", decl
, arg
);
13438 /* Effective C++ rule 23. */
13439 if (!DECL_ASSIGNMENT_OPERATOR_P (decl
)
13440 && (operator_code
== PLUS_EXPR
13441 || operator_code
== MINUS_EXPR
13442 || operator_code
== TRUNC_DIV_EXPR
13443 || operator_code
== MULT_EXPR
13444 || operator_code
== TRUNC_MOD_EXPR
)
13445 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl
))) == REFERENCE_TYPE
)
13446 warning (OPT_Weffc__
, "%qD should return by value", decl
);
13451 /* Return a string giving the keyword associate with CODE. */
13453 static const char *
13454 tag_name (enum tag_types code
)
13466 case typename_type
:
13469 gcc_unreachable ();
13473 /* Name lookup in an elaborated-type-specifier (after the keyword
13474 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
13475 elaborated-type-specifier is invalid, issue a diagnostic and return
13476 error_mark_node; otherwise, return the *_TYPE to which it referred.
13477 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
13480 check_elaborated_type_specifier (enum tag_types tag_code
,
13482 bool allow_template_p
)
13488 struct S { struct S *p; };
13490 name lookup will find the TYPE_DECL for the implicit "S::S"
13491 typedef. Adjust for that here. */
13492 if (DECL_SELF_REFERENCE_P (decl
))
13493 decl
= TYPE_NAME (TREE_TYPE (decl
));
13495 type
= TREE_TYPE (decl
);
13497 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
13498 is false for this case as well. */
13499 if (TREE_CODE (type
) == TEMPLATE_TYPE_PARM
)
13501 error ("using template type parameter %qT after %qs",
13502 type
, tag_name (tag_code
));
13503 return error_mark_node
;
13505 /* Accept template template parameters. */
13506 else if (allow_template_p
13507 && (TREE_CODE (type
) == BOUND_TEMPLATE_TEMPLATE_PARM
13508 || TREE_CODE (type
) == TEMPLATE_TEMPLATE_PARM
))
13512 If the identifier resolves to a typedef-name or the
13513 simple-template-id resolves to an alias template
13514 specialization, the elaborated-type-specifier is ill-formed.
13516 In other words, the only legitimate declaration to use in the
13517 elaborated type specifier is the implicit typedef created when
13518 the type is declared. */
13519 else if (!DECL_IMPLICIT_TYPEDEF_P (decl
)
13520 && !DECL_SELF_REFERENCE_P (decl
)
13521 && tag_code
!= typename_type
)
13523 if (alias_template_specialization_p (type
))
13524 error ("using alias template specialization %qT after %qs",
13525 type
, tag_name (tag_code
));
13527 error ("using typedef-name %qD after %qs", decl
, tag_name (tag_code
));
13528 inform (DECL_SOURCE_LOCATION (decl
),
13529 "%qD has a previous declaration here", decl
);
13530 return error_mark_node
;
13532 else if (TREE_CODE (type
) != RECORD_TYPE
13533 && TREE_CODE (type
) != UNION_TYPE
13534 && tag_code
!= enum_type
13535 && tag_code
!= typename_type
)
13537 error ("%qT referred to as %qs", type
, tag_name (tag_code
));
13538 inform (location_of (type
), "%qT has a previous declaration here", type
);
13539 return error_mark_node
;
13541 else if (TREE_CODE (type
) != ENUMERAL_TYPE
13542 && tag_code
== enum_type
)
13544 error ("%qT referred to as enum", type
);
13545 inform (location_of (type
), "%qT has a previous declaration here", type
);
13546 return error_mark_node
;
13548 else if (!allow_template_p
13549 && TREE_CODE (type
) == RECORD_TYPE
13550 && CLASSTYPE_IS_TEMPLATE (type
))
13552 /* If a class template appears as elaborated type specifier
13553 without a template header such as:
13555 template <class T> class C {};
13556 void f(class C); // No template header here
13558 then the required template argument is missing. */
13559 error ("template argument required for %<%s %T%>",
13560 tag_name (tag_code
),
13561 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type
)));
13562 return error_mark_node
;
13568 /* Lookup NAME in elaborate type specifier in scope according to
13569 SCOPE and issue diagnostics if necessary.
13570 Return *_TYPE node upon success, NULL_TREE when the NAME is not
13571 found, and ERROR_MARK_NODE for type error. */
13574 lookup_and_check_tag (enum tag_types tag_code
, tree name
,
13575 tag_scope scope
, bool template_header_p
)
13579 if (scope
== ts_global
)
13581 /* First try ordinary name lookup, ignoring hidden class name
13582 injected via friend declaration. */
13583 decl
= lookup_name_prefer_type (name
, 2);
13584 decl
= strip_using_decl (decl
);
13585 /* If that fails, the name will be placed in the smallest
13586 non-class, non-function-prototype scope according to 3.3.1/5.
13587 We may already have a hidden name declared as friend in this
13588 scope. So lookup again but not ignoring hidden names.
13589 If we find one, that name will be made visible rather than
13590 creating a new tag. */
13592 decl
= lookup_type_scope (name
, ts_within_enclosing_non_class
);
13595 decl
= lookup_type_scope (name
, scope
);
13598 && (DECL_CLASS_TEMPLATE_P (decl
)
13599 /* If scope is ts_current we're defining a class, so ignore a
13600 template template parameter. */
13601 || (scope
!= ts_current
13602 && DECL_TEMPLATE_TEMPLATE_PARM_P (decl
))))
13603 decl
= DECL_TEMPLATE_RESULT (decl
);
13605 if (decl
&& TREE_CODE (decl
) == TYPE_DECL
)
13607 /* Look for invalid nested type:
13611 if (scope
== ts_current
&& DECL_SELF_REFERENCE_P (decl
))
13613 error ("%qD has the same name as the class in which it is "
13616 return error_mark_node
;
13619 /* Two cases we need to consider when deciding if a class
13620 template is allowed as an elaborated type specifier:
13621 1. It is a self reference to its own class.
13622 2. It comes with a template header.
13626 template <class T> class C {
13627 class C *c1; // DECL_SELF_REFERENCE_P is true
13630 template <class U> class C; // template_header_p is true
13631 template <class T> class C<T>::D {
13632 class C *c2; // DECL_SELF_REFERENCE_P is true
13635 t
= check_elaborated_type_specifier (tag_code
,
13638 | DECL_SELF_REFERENCE_P (decl
));
13639 if (template_header_p
&& t
&& CLASS_TYPE_P (t
)
13640 && (!CLASSTYPE_TEMPLATE_INFO (t
)
13641 || (!PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t
)))))
13643 error ("%qT is not a template", t
);
13644 inform (location_of (t
), "previous declaration here");
13645 if (TYPE_CLASS_SCOPE_P (t
)
13646 && CLASSTYPE_TEMPLATE_INFO (TYPE_CONTEXT (t
)))
13647 inform (input_location
,
13648 "perhaps you want to explicitly add %<%T::%>",
13650 t
= error_mark_node
;
13655 else if (decl
&& TREE_CODE (decl
) == TREE_LIST
)
13657 error ("reference to %qD is ambiguous", name
);
13658 print_candidates (decl
);
13659 return error_mark_node
;
13665 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
13666 Define the tag as a forward-reference if it is not defined.
13668 If a declaration is given, process it here, and report an error if
13669 multiple declarations are not identical.
13671 SCOPE is TS_CURRENT when this is also a definition. Only look in
13672 the current frame for the name (since C++ allows new names in any
13673 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
13674 declaration. Only look beginning from the current scope outward up
13675 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
13677 TEMPLATE_HEADER_P is true when this declaration is preceded by
13678 a set of template parameters. */
13681 xref_tag_1 (enum tag_types tag_code
, tree name
,
13682 tag_scope scope
, bool template_header_p
)
13684 enum tree_code code
;
13685 tree context
= NULL_TREE
;
13687 gcc_assert (identifier_p (name
));
13693 code
= RECORD_TYPE
;
13699 code
= ENUMERAL_TYPE
;
13702 gcc_unreachable ();
13705 /* In case of anonymous name, xref_tag is only called to
13706 make type node and push name. Name lookup is not required. */
13707 tree t
= NULL_TREE
;
13708 if (scope
!= ts_lambda
&& !anon_aggrname_p (name
))
13709 t
= lookup_and_check_tag (tag_code
, name
, scope
, template_header_p
);
13711 if (t
== error_mark_node
)
13712 return error_mark_node
;
13714 if (scope
!= ts_current
&& t
&& current_class_type
13715 && template_class_depth (current_class_type
)
13716 && template_header_p
)
13718 if (TREE_CODE (t
) == TEMPLATE_TEMPLATE_PARM
)
13721 /* Since SCOPE is not TS_CURRENT, we are not looking at a
13722 definition of this tag. Since, in addition, we are currently
13723 processing a (member) template declaration of a template
13724 class, we must be very careful; consider:
13726 template <class X> struct S1
13728 template <class U> struct S2
13730 template <class V> friend struct S1;
13733 Here, the S2::S1 declaration should not be confused with the
13734 outer declaration. In particular, the inner version should
13735 have a template parameter of level 2, not level 1.
13737 On the other hand, when presented with:
13739 template <class T> struct S1
13741 template <class U> struct S2 {};
13742 template <class U> friend struct S2;
13745 the friend must find S1::S2 eventually. We accomplish this
13746 by making sure that the new type we create to represent this
13747 declaration has the right TYPE_CONTEXT. */
13748 context
= TYPE_CONTEXT (t
);
13754 /* If no such tag is yet defined, create a forward-reference node
13755 and record it as the "definition".
13756 When a real declaration of this type is found,
13757 the forward-reference will be altered into a real type. */
13758 if (code
== ENUMERAL_TYPE
)
13760 error ("use of enum %q#D without previous declaration", name
);
13761 return error_mark_node
;
13765 t
= make_class_type (code
);
13766 TYPE_CONTEXT (t
) = context
;
13767 if (scope
== ts_lambda
)
13769 /* Mark it as a lambda type. */
13770 CLASSTYPE_LAMBDA_EXPR (t
) = error_mark_node
;
13771 /* And push it into current scope. */
13772 scope
= ts_current
;
13774 t
= pushtag (name
, t
, scope
);
13779 if (template_header_p
&& MAYBE_CLASS_TYPE_P (t
))
13781 /* Check that we aren't trying to overload a class with different
13783 tree constr
= NULL_TREE
;
13784 if (current_template_parms
)
13786 tree reqs
= TEMPLATE_PARMS_CONSTRAINTS (current_template_parms
);
13787 constr
= build_constraints (reqs
, NULL_TREE
);
13789 if (!redeclare_class_template (t
, current_template_parms
, constr
))
13790 return error_mark_node
;
13792 else if (!processing_template_decl
13793 && CLASS_TYPE_P (t
)
13794 && CLASSTYPE_IS_TEMPLATE (t
))
13796 error ("redeclaration of %qT as a non-template", t
);
13797 inform (location_of (t
), "previous declaration %qD", t
);
13798 return error_mark_node
;
13801 if (scope
!= ts_within_enclosing_non_class
&& TYPE_HIDDEN_P (t
))
13803 /* This is no longer an invisible friend. Make it
13805 tree decl
= TYPE_NAME (t
);
13807 DECL_ANTICIPATED (decl
) = false;
13808 DECL_FRIEND_P (decl
) = false;
13810 if (TYPE_TEMPLATE_INFO (t
))
13812 tree tmpl
= TYPE_TI_TEMPLATE (t
);
13813 DECL_ANTICIPATED (tmpl
) = false;
13814 DECL_FRIEND_P (tmpl
) = false;
13822 /* Wrapper for xref_tag_1. */
13825 xref_tag (enum tag_types tag_code
, tree name
,
13826 tag_scope scope
, bool template_header_p
)
13830 subtime
= timevar_cond_start (TV_NAME_LOOKUP
);
13831 ret
= xref_tag_1 (tag_code
, name
, scope
, template_header_p
);
13832 timevar_cond_stop (TV_NAME_LOOKUP
, subtime
);
13838 xref_tag_from_type (tree old
, tree id
, tag_scope scope
)
13840 enum tag_types tag_kind
;
13842 if (TREE_CODE (old
) == RECORD_TYPE
)
13843 tag_kind
= (CLASSTYPE_DECLARED_CLASS (old
) ? class_type
: record_type
);
13845 tag_kind
= union_type
;
13847 if (id
== NULL_TREE
)
13848 id
= TYPE_IDENTIFIER (old
);
13850 return xref_tag (tag_kind
, id
, scope
, false);
13853 /* Create the binfo hierarchy for REF with (possibly NULL) base list
13854 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
13855 access_* node, and the TREE_VALUE is the type of the base-class.
13856 Non-NULL TREE_TYPE indicates virtual inheritance. */
13859 xref_basetypes (tree ref
, tree base_list
)
13862 tree binfo
, base_binfo
;
13863 unsigned max_vbases
= 0; /* Maximum direct & indirect virtual bases. */
13864 unsigned max_bases
= 0; /* Maximum direct bases. */
13865 unsigned max_dvbases
= 0; /* Maximum direct virtual bases. */
13867 tree default_access
;
13868 tree igo_prev
; /* Track Inheritance Graph Order. */
13870 if (ref
== error_mark_node
)
13873 /* The base of a derived class is private by default, all others are
13875 default_access
= (TREE_CODE (ref
) == RECORD_TYPE
13876 && CLASSTYPE_DECLARED_CLASS (ref
)
13877 ? access_private_node
: access_public_node
);
13879 /* First, make sure that any templates in base-classes are
13880 instantiated. This ensures that if we call ourselves recursively
13881 we do not get confused about which classes are marked and which
13883 basep
= &base_list
;
13886 tree basetype
= TREE_VALUE (*basep
);
13888 /* The dependent_type_p call below should really be dependent_scope_p
13889 so that we give a hard error about using an incomplete type as a
13890 base, but we allow it with a pedwarn for backward
13892 if (processing_template_decl
13893 && CLASS_TYPE_P (basetype
) && TYPE_BEING_DEFINED (basetype
))
13894 cxx_incomplete_type_diagnostic (NULL_TREE
, basetype
, DK_PEDWARN
);
13895 if (!dependent_type_p (basetype
)
13896 && !complete_type_or_else (basetype
, NULL
))
13897 /* An incomplete type. Remove it from the list. */
13898 *basep
= TREE_CHAIN (*basep
);
13902 if (TREE_TYPE (*basep
))
13904 if (CLASS_TYPE_P (basetype
))
13905 max_vbases
+= vec_safe_length (CLASSTYPE_VBASECLASSES (basetype
));
13906 basep
= &TREE_CHAIN (*basep
);
13909 max_vbases
+= max_dvbases
;
13911 TYPE_MARKED_P (ref
) = 1;
13913 /* The binfo slot should be empty, unless this is an (ill-formed)
13915 gcc_assert (!TYPE_BINFO (ref
) || TYPE_SIZE (ref
));
13917 gcc_assert (TYPE_MAIN_VARIANT (ref
) == ref
);
13919 binfo
= make_tree_binfo (max_bases
);
13921 TYPE_BINFO (ref
) = binfo
;
13922 BINFO_OFFSET (binfo
) = size_zero_node
;
13923 BINFO_TYPE (binfo
) = ref
;
13925 /* Apply base-class info set up to the variants of this type. */
13926 fixup_type_variants (ref
);
13930 vec_alloc (BINFO_BASE_ACCESSES (binfo
), max_bases
);
13931 /* A C++98 POD cannot have base classes. */
13932 CLASSTYPE_NON_LAYOUT_POD_P (ref
) = true;
13934 if (TREE_CODE (ref
) == UNION_TYPE
)
13936 error ("derived union %qT invalid", ref
);
13942 warning (OPT_Wmultiple_inheritance
,
13943 "%qT defined with multiple direct bases", ref
);
13947 /* An aggregate can't have virtual base classes. */
13948 CLASSTYPE_NON_AGGREGATE (ref
) = true;
13950 vec_alloc (CLASSTYPE_VBASECLASSES (ref
), max_vbases
);
13953 warning (OPT_Wvirtual_inheritance
,
13954 "%qT defined with direct virtual base", ref
);
13957 for (igo_prev
= binfo
; base_list
; base_list
= TREE_CHAIN (base_list
))
13959 tree access
= TREE_PURPOSE (base_list
);
13960 int via_virtual
= TREE_TYPE (base_list
) != NULL_TREE
;
13961 tree basetype
= TREE_VALUE (base_list
);
13963 if (access
== access_default_node
)
13964 access
= default_access
;
13966 /* Before C++17, an aggregate cannot have base classes. In C++17, an
13967 aggregate can't have virtual, private, or protected base classes. */
13968 if (cxx_dialect
< cxx17
13969 || access
!= access_public_node
13971 CLASSTYPE_NON_AGGREGATE (ref
) = true;
13973 if (PACK_EXPANSION_P (basetype
))
13974 basetype
= PACK_EXPANSION_PATTERN (basetype
);
13975 if (TREE_CODE (basetype
) == TYPE_DECL
)
13976 basetype
= TREE_TYPE (basetype
);
13977 if (!MAYBE_CLASS_TYPE_P (basetype
) || TREE_CODE (basetype
) == UNION_TYPE
)
13979 error ("base type %qT fails to be a struct or class type",
13984 base_binfo
= NULL_TREE
;
13985 if (CLASS_TYPE_P (basetype
) && !dependent_scope_p (basetype
))
13987 base_binfo
= TYPE_BINFO (basetype
);
13988 /* The original basetype could have been a typedef'd type. */
13989 basetype
= BINFO_TYPE (base_binfo
);
13991 /* Inherit flags from the base. */
13992 TYPE_HAS_NEW_OPERATOR (ref
)
13993 |= TYPE_HAS_NEW_OPERATOR (basetype
);
13994 TYPE_HAS_ARRAY_NEW_OPERATOR (ref
)
13995 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype
);
13996 TYPE_GETS_DELETE (ref
) |= TYPE_GETS_DELETE (basetype
);
13997 TYPE_HAS_CONVERSION (ref
) |= TYPE_HAS_CONVERSION (basetype
);
13998 CLASSTYPE_DIAMOND_SHAPED_P (ref
)
13999 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype
);
14000 CLASSTYPE_REPEATED_BASE_P (ref
)
14001 |= CLASSTYPE_REPEATED_BASE_P (basetype
);
14004 /* We must do this test after we've seen through a typedef
14006 if (TYPE_MARKED_P (basetype
))
14008 if (basetype
== ref
)
14009 error ("recursive type %qT undefined", basetype
);
14011 error ("duplicate base type %qT invalid", basetype
);
14015 if (PACK_EXPANSION_P (TREE_VALUE (base_list
)))
14016 /* Regenerate the pack expansion for the bases. */
14017 basetype
= make_pack_expansion (basetype
);
14019 TYPE_MARKED_P (basetype
) = 1;
14021 base_binfo
= copy_binfo (base_binfo
, basetype
, ref
,
14022 &igo_prev
, via_virtual
);
14023 if (!BINFO_INHERITANCE_CHAIN (base_binfo
))
14024 BINFO_INHERITANCE_CHAIN (base_binfo
) = binfo
;
14026 BINFO_BASE_APPEND (binfo
, base_binfo
);
14027 BINFO_BASE_ACCESS_APPEND (binfo
, access
);
14031 /* Update max_vbases to reflect the reality that we are dropping
14032 this base: if it reaches zero we want to undo the vec_alloc
14033 above to avoid inconsistencies during error-recovery: eg, in
14034 build_special_member_call, CLASSTYPE_VBASECLASSES non null
14035 and vtt null (c++/27952). */
14038 if (CLASS_TYPE_P (basetype
))
14040 -= vec_safe_length (CLASSTYPE_VBASECLASSES (basetype
));
14043 if (CLASSTYPE_VBASECLASSES (ref
)
14044 && max_vbases
== 0)
14045 vec_free (CLASSTYPE_VBASECLASSES (ref
));
14047 if (vec_safe_length (CLASSTYPE_VBASECLASSES (ref
)) < max_vbases
)
14048 /* If we didn't get max_vbases vbases, we must have shared at
14049 least one of them, and are therefore diamond shaped. */
14050 CLASSTYPE_DIAMOND_SHAPED_P (ref
) = 1;
14052 /* Unmark all the types. */
14053 for (i
= 0; BINFO_BASE_ITERATE (binfo
, i
, base_binfo
); i
++)
14054 TYPE_MARKED_P (BINFO_TYPE (base_binfo
)) = 0;
14055 TYPE_MARKED_P (ref
) = 0;
14057 /* Now see if we have a repeated base type. */
14058 if (!CLASSTYPE_REPEATED_BASE_P (ref
))
14060 for (base_binfo
= binfo
; base_binfo
;
14061 base_binfo
= TREE_CHAIN (base_binfo
))
14063 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo
)))
14065 CLASSTYPE_REPEATED_BASE_P (ref
) = 1;
14068 TYPE_MARKED_P (BINFO_TYPE (base_binfo
)) = 1;
14070 for (base_binfo
= binfo
; base_binfo
;
14071 base_binfo
= TREE_CHAIN (base_binfo
))
14072 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo
)))
14073 TYPE_MARKED_P (BINFO_TYPE (base_binfo
)) = 0;
14080 /* Copies the enum-related properties from type SRC to type DST.
14081 Used with the underlying type of an enum and the enum itself. */
14083 copy_type_enum (tree dst
, tree src
)
14086 for (t
= dst
; t
; t
= TYPE_NEXT_VARIANT (t
))
14088 TYPE_MIN_VALUE (t
) = TYPE_MIN_VALUE (src
);
14089 TYPE_MAX_VALUE (t
) = TYPE_MAX_VALUE (src
);
14090 TYPE_SIZE (t
) = TYPE_SIZE (src
);
14091 TYPE_SIZE_UNIT (t
) = TYPE_SIZE_UNIT (src
);
14092 SET_TYPE_MODE (dst
, TYPE_MODE (src
));
14093 TYPE_PRECISION (t
) = TYPE_PRECISION (src
);
14094 unsigned valign
= TYPE_ALIGN (src
);
14095 if (TYPE_USER_ALIGN (t
))
14096 valign
= MAX (valign
, TYPE_ALIGN (t
));
14098 TYPE_USER_ALIGN (t
) = TYPE_USER_ALIGN (src
);
14099 SET_TYPE_ALIGN (t
, valign
);
14100 TYPE_UNSIGNED (t
) = TYPE_UNSIGNED (src
);
14104 /* Begin compiling the definition of an enumeration type.
14107 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
14109 UNDERLYING_TYPE is the type that will be used as the storage for
14110 the enumeration type. This should be NULL_TREE if no storage type
14113 ATTRIBUTES are any attributes specified after the enum-key.
14115 SCOPED_ENUM_P is true if this is a scoped enumeration type.
14117 if IS_NEW is not NULL, gets TRUE iff a new type is created.
14119 Returns the type object, as yet incomplete.
14120 Also records info about it so that build_enumerator
14121 may be used to declare the individual values as they are read. */
14124 start_enum (tree name
, tree enumtype
, tree underlying_type
,
14125 tree attributes
, bool scoped_enum_p
, bool *is_new
)
14127 tree prevtype
= NULL_TREE
;
14128 gcc_assert (identifier_p (name
));
14132 /* [C++0x dcl.enum]p5:
14134 If not explicitly specified, the underlying type of a scoped
14135 enumeration type is int. */
14136 if (!underlying_type
&& scoped_enum_p
)
14137 underlying_type
= integer_type_node
;
14139 if (underlying_type
)
14140 underlying_type
= cv_unqualified (underlying_type
);
14142 /* If this is the real definition for a previous forward reference,
14143 fill in the contents in the same object that used to be the
14144 forward reference. */
14146 enumtype
= lookup_and_check_tag (enum_type
, name
,
14147 /*tag_scope=*/ts_current
,
14148 /*template_header_p=*/false);
14150 /* In case of a template_decl, the only check that should be deferred
14151 to instantiation time is the comparison of underlying types. */
14152 if (enumtype
&& TREE_CODE (enumtype
) == ENUMERAL_TYPE
)
14154 if (scoped_enum_p
!= SCOPED_ENUM_P (enumtype
))
14156 error_at (input_location
, "scoped/unscoped mismatch "
14157 "in enum %q#T", enumtype
);
14158 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype
)),
14159 "previous definition here");
14160 enumtype
= error_mark_node
;
14162 else if (ENUM_FIXED_UNDERLYING_TYPE_P (enumtype
) != !! underlying_type
)
14164 error_at (input_location
, "underlying type mismatch "
14165 "in enum %q#T", enumtype
);
14166 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype
)),
14167 "previous definition here");
14168 enumtype
= error_mark_node
;
14170 else if (underlying_type
&& ENUM_UNDERLYING_TYPE (enumtype
)
14171 && !dependent_type_p (underlying_type
)
14172 && !dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype
))
14173 && !same_type_p (underlying_type
,
14174 ENUM_UNDERLYING_TYPE (enumtype
)))
14176 error_at (input_location
, "different underlying type "
14177 "in enum %q#T", enumtype
);
14178 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype
)),
14179 "previous definition here");
14180 underlying_type
= NULL_TREE
;
14184 if (!enumtype
|| TREE_CODE (enumtype
) != ENUMERAL_TYPE
14185 || processing_template_decl
)
14187 /* In case of error, make a dummy enum to allow parsing to
14189 if (enumtype
== error_mark_node
)
14191 name
= make_anon_name ();
14192 enumtype
= NULL_TREE
;
14195 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
14196 of an opaque enum, or an opaque enum of an already defined
14197 enumeration (C++0x only).
14198 In any other case, it'll be NULL_TREE. */
14204 prevtype
= enumtype
;
14206 /* Do not push the decl more than once, unless we need to
14207 compare underlying types at instantiation time */
14209 || TREE_CODE (enumtype
) != ENUMERAL_TYPE
14210 || (underlying_type
14211 && dependent_type_p (underlying_type
))
14212 || (ENUM_UNDERLYING_TYPE (enumtype
)
14213 && dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype
))))
14215 enumtype
= cxx_make_type (ENUMERAL_TYPE
);
14216 enumtype
= pushtag (name
, enumtype
, /*tag_scope=*/ts_current
);
14218 /* std::byte aliases anything. */
14219 if (enumtype
!= error_mark_node
14220 && TYPE_CONTEXT (enumtype
) == std_node
14221 && !strcmp ("byte", TYPE_NAME_STRING (enumtype
)))
14222 TYPE_ALIAS_SET (enumtype
) = 0;
14225 enumtype
= xref_tag (enum_type
, name
, /*tag_scope=*/ts_current
,
14228 if (enumtype
== error_mark_node
)
14229 return error_mark_node
;
14231 /* The enum is considered opaque until the opening '{' of the
14232 enumerator list. */
14233 SET_OPAQUE_ENUM_P (enumtype
, true);
14234 ENUM_FIXED_UNDERLYING_TYPE_P (enumtype
) = !! underlying_type
;
14237 SET_SCOPED_ENUM_P (enumtype
, scoped_enum_p
);
14239 cplus_decl_attributes (&enumtype
, attributes
, (int)ATTR_FLAG_TYPE_IN_PLACE
);
14241 if (underlying_type
)
14243 if (ENUM_UNDERLYING_TYPE (enumtype
))
14244 /* We already checked that it matches, don't change it to a different
14245 typedef variant. */;
14246 else if (CP_INTEGRAL_TYPE_P (underlying_type
))
14248 copy_type_enum (enumtype
, underlying_type
);
14249 ENUM_UNDERLYING_TYPE (enumtype
) = underlying_type
;
14251 else if (dependent_type_p (underlying_type
))
14252 ENUM_UNDERLYING_TYPE (enumtype
) = underlying_type
;
14254 error ("underlying type %qT of %qT must be an integral type",
14255 underlying_type
, enumtype
);
14258 /* If into a template class, the returned enum is always the first
14259 declaration (opaque or not) seen. This way all the references to
14260 this type will be to the same declaration. The following ones are used
14261 only to check for definition errors. */
14262 if (prevtype
&& processing_template_decl
)
14268 /* After processing and defining all the values of an enumeration type,
14269 install their decls in the enumeration type.
14270 ENUMTYPE is the type object. */
14273 finish_enum_value_list (tree enumtype
)
14276 tree underlying_type
;
14279 tree minnode
, maxnode
;
14282 bool fixed_underlying_type_p
14283 = ENUM_UNDERLYING_TYPE (enumtype
) != NULL_TREE
;
14285 /* We built up the VALUES in reverse order. */
14286 TYPE_VALUES (enumtype
) = nreverse (TYPE_VALUES (enumtype
));
14288 /* For an enum defined in a template, just set the type of the values;
14289 all further processing is postponed until the template is
14290 instantiated. We need to set the type so that tsubst of a CONST_DECL
14292 if (processing_template_decl
)
14294 for (values
= TYPE_VALUES (enumtype
);
14296 values
= TREE_CHAIN (values
))
14297 TREE_TYPE (TREE_VALUE (values
)) = enumtype
;
14301 /* Determine the minimum and maximum values of the enumerators. */
14302 if (TYPE_VALUES (enumtype
))
14304 minnode
= maxnode
= NULL_TREE
;
14306 for (values
= TYPE_VALUES (enumtype
);
14308 values
= TREE_CHAIN (values
))
14310 decl
= TREE_VALUE (values
);
14312 /* [dcl.enum]: Following the closing brace of an enum-specifier,
14313 each enumerator has the type of its enumeration. Prior to the
14314 closing brace, the type of each enumerator is the type of its
14315 initializing value. */
14316 TREE_TYPE (decl
) = enumtype
;
14318 /* Update the minimum and maximum values, if appropriate. */
14319 value
= DECL_INITIAL (decl
);
14320 if (value
== error_mark_node
)
14321 value
= integer_zero_node
;
14322 /* Figure out what the minimum and maximum values of the
14323 enumerators are. */
14325 minnode
= maxnode
= value
;
14326 else if (tree_int_cst_lt (maxnode
, value
))
14328 else if (tree_int_cst_lt (value
, minnode
))
14335 If the enumerator-list is empty, the underlying type is as if
14336 the enumeration had a single enumerator with value 0. */
14337 minnode
= maxnode
= integer_zero_node
;
14339 if (!fixed_underlying_type_p
)
14341 /* Compute the number of bits require to represent all values of the
14342 enumeration. We must do this before the type of MINNODE and
14343 MAXNODE are transformed, since tree_int_cst_min_precision relies
14344 on the TREE_TYPE of the value it is passed. */
14345 signop sgn
= tree_int_cst_sgn (minnode
) >= 0 ? UNSIGNED
: SIGNED
;
14346 int lowprec
= tree_int_cst_min_precision (minnode
, sgn
);
14347 int highprec
= tree_int_cst_min_precision (maxnode
, sgn
);
14348 int precision
= MAX (lowprec
, highprec
);
14350 bool use_short_enum
;
14352 /* Determine the underlying type of the enumeration.
14356 The underlying type of an enumeration is an integral type that
14357 can represent all the enumerator values defined in the
14358 enumeration. It is implementation-defined which integral type is
14359 used as the underlying type for an enumeration except that the
14360 underlying type shall not be larger than int unless the value of
14361 an enumerator cannot fit in an int or unsigned int.
14363 We use "int" or an "unsigned int" as the underlying type, even if
14364 a smaller integral type would work, unless the user has
14365 explicitly requested that we use the smallest possible type. The
14366 user can request that for all enumerations with a command line
14367 flag, or for just one enumeration with an attribute. */
14369 use_short_enum
= flag_short_enums
14370 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype
));
14372 /* If the precision of the type was specified with an attribute and it
14373 was too small, give an error. Otherwise, use it. */
14374 if (TYPE_PRECISION (enumtype
))
14376 if (precision
> TYPE_PRECISION (enumtype
))
14377 error ("specified mode too small for enumeral values");
14380 use_short_enum
= true;
14381 precision
= TYPE_PRECISION (enumtype
);
14385 for (itk
= (use_short_enum
? itk_char
: itk_int
);
14389 underlying_type
= integer_types
[itk
];
14390 if (underlying_type
!= NULL_TREE
14391 && TYPE_PRECISION (underlying_type
) >= precision
14392 && TYPE_SIGN (underlying_type
) == sgn
)
14395 if (itk
== itk_none
)
14399 IF no integral type can represent all the enumerator values, the
14400 enumeration is ill-formed. */
14401 error ("no integral type can represent all of the enumerator values "
14402 "for %qT", enumtype
);
14403 precision
= TYPE_PRECISION (long_long_integer_type_node
);
14404 underlying_type
= integer_types
[itk_unsigned_long_long
];
14409 The value of sizeof() applied to an enumeration type, an object
14410 of an enumeration type, or an enumerator, is the value of sizeof()
14411 applied to the underlying type. */
14412 copy_type_enum (enumtype
, underlying_type
);
14414 /* Compute the minimum and maximum values for the type.
14418 For an enumeration where emin is the smallest enumerator and emax
14419 is the largest, the values of the enumeration are the values of the
14420 underlying type in the range bmin to bmax, where bmin and bmax are,
14421 respectively, the smallest and largest values of the smallest bit-
14422 field that can store emin and emax. */
14424 /* The middle-end currently assumes that types with TYPE_PRECISION
14425 narrower than their underlying type are suitably zero or sign
14426 extended to fill their mode. Similarly, it assumes that the front
14427 end assures that a value of a particular type must be within
14428 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
14430 We used to set these fields based on bmin and bmax, but that led
14431 to invalid assumptions like optimizing away bounds checking. So
14432 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
14433 TYPE_MAX_VALUE to the values for the mode above and only restrict
14434 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
14435 ENUM_UNDERLYING_TYPE (enumtype
)
14436 = build_distinct_type_copy (underlying_type
);
14437 TYPE_PRECISION (ENUM_UNDERLYING_TYPE (enumtype
)) = precision
;
14438 set_min_and_max_values_for_integral_type
14439 (ENUM_UNDERLYING_TYPE (enumtype
), precision
, sgn
);
14441 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
14442 if (flag_strict_enums
)
14443 set_min_and_max_values_for_integral_type (enumtype
, precision
, sgn
);
14446 underlying_type
= ENUM_UNDERLYING_TYPE (enumtype
);
14448 /* Convert each of the enumerators to the type of the underlying
14449 type of the enumeration. */
14450 for (values
= TYPE_VALUES (enumtype
); values
; values
= TREE_CHAIN (values
))
14452 location_t saved_location
;
14454 decl
= TREE_VALUE (values
);
14455 saved_location
= input_location
;
14456 input_location
= DECL_SOURCE_LOCATION (decl
);
14457 if (fixed_underlying_type_p
)
14458 /* If the enumeration type has a fixed underlying type, we
14459 already checked all of the enumerator values. */
14460 value
= DECL_INITIAL (decl
);
14462 value
= perform_implicit_conversion (underlying_type
,
14463 DECL_INITIAL (decl
),
14464 tf_warning_or_error
);
14465 input_location
= saved_location
;
14467 /* Do not clobber shared ints. */
14468 if (value
!= error_mark_node
)
14470 value
= copy_node (value
);
14472 TREE_TYPE (value
) = enumtype
;
14474 DECL_INITIAL (decl
) = value
;
14477 /* Fix up all variant types of this enum type. */
14478 for (t
= TYPE_MAIN_VARIANT (enumtype
); t
; t
= TYPE_NEXT_VARIANT (t
))
14479 TYPE_VALUES (t
) = TYPE_VALUES (enumtype
);
14481 if (at_class_scope_p ()
14482 && COMPLETE_TYPE_P (current_class_type
)
14483 && UNSCOPED_ENUM_P (enumtype
))
14485 insert_late_enum_def_bindings (current_class_type
, enumtype
);
14486 /* TYPE_FIELDS needs fixup. */
14487 fixup_type_variants (current_class_type
);
14490 /* Finish debugging output for this type. */
14491 rest_of_type_compilation (enumtype
, namespace_bindings_p ());
14493 /* Each enumerator now has the type of its enumeration. Clear the cache
14494 so that this change in types doesn't confuse us later on. */
14495 clear_cv_and_fold_caches ();
14498 /* Finishes the enum type. This is called only the first time an
14499 enumeration is seen, be it opaque or odinary.
14500 ENUMTYPE is the type object. */
14503 finish_enum (tree enumtype
)
14505 if (processing_template_decl
)
14507 if (at_function_scope_p ())
14508 add_stmt (build_min (TAG_DEFN
, enumtype
));
14512 /* If this is a forward declaration, there should not be any variants,
14513 though we can get a variant in the middle of an enum-specifier with
14514 wacky code like 'enum E { e = sizeof(const E*) };' */
14515 gcc_assert (enumtype
== TYPE_MAIN_VARIANT (enumtype
)
14516 && (TYPE_VALUES (enumtype
)
14517 || !TYPE_NEXT_VARIANT (enumtype
)));
14520 /* Build and install a CONST_DECL for an enumeration constant of the
14521 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
14522 Apply ATTRIBUTES if available. LOC is the location of NAME.
14523 Assignment of sequential values by default is handled here. */
14526 build_enumerator (tree name
, tree value
, tree enumtype
, tree attributes
,
14533 /* scalar_constant_value will pull out this expression, so make sure
14534 it's folded as appropriate. */
14535 if (processing_template_decl
)
14536 value
= fold_non_dependent_expr (value
);
14538 /* If the VALUE was erroneous, pretend it wasn't there; that will
14539 result in the enum being assigned the next value in sequence. */
14540 if (value
== error_mark_node
)
14543 /* Remove no-op casts from the value. */
14545 STRIP_TYPE_NOPS (value
);
14547 if (! processing_template_decl
)
14549 /* Validate and default VALUE. */
14550 if (value
!= NULL_TREE
)
14552 if (!ENUM_UNDERLYING_TYPE (enumtype
))
14554 tree tmp_value
= build_expr_type_conversion (WANT_INT
| WANT_ENUM
,
14559 else if (! INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P
14560 (TREE_TYPE (value
)))
14561 value
= perform_implicit_conversion_flags
14562 (ENUM_UNDERLYING_TYPE (enumtype
), value
, tf_warning_or_error
,
14563 LOOKUP_IMPLICIT
| LOOKUP_NO_NARROWING
);
14565 if (value
== error_mark_node
)
14568 if (value
!= NULL_TREE
)
14570 if (! INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P
14571 (TREE_TYPE (value
)))
14573 error ("enumerator value for %qD must have integral or "
14574 "unscoped enumeration type", name
);
14579 value
= cxx_constant_value (value
);
14581 if (TREE_CODE (value
) != INTEGER_CST
)
14583 error ("enumerator value for %qD is not an integer "
14591 /* Default based on previous value. */
14592 if (value
== NULL_TREE
)
14594 if (TYPE_VALUES (enumtype
))
14599 /* C++03 7.2/4: If no initializer is specified for the first
14600 enumerator, the type is an unspecified integral
14601 type. Otherwise the type is the same as the type of the
14602 initializing value of the preceding enumerator unless the
14603 incremented value is not representable in that type, in
14604 which case the type is an unspecified integral type
14605 sufficient to contain the incremented value. */
14606 prev_value
= DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype
)));
14607 if (error_operand_p (prev_value
))
14608 value
= error_mark_node
;
14611 tree type
= TREE_TYPE (prev_value
);
14612 signop sgn
= TYPE_SIGN (type
);
14613 widest_int wi
= wi::add (wi::to_widest (prev_value
), 1, sgn
,
14617 bool pos
= !wi::neg_p (wi
, sgn
);
14618 if (!wi::fits_to_tree_p (wi
, type
))
14621 for (itk
= itk_int
; itk
!= itk_none
; itk
++)
14623 type
= integer_types
[itk
];
14624 if (type
!= NULL_TREE
14625 && (pos
|| !TYPE_UNSIGNED (type
))
14626 && wi::fits_to_tree_p (wi
, type
))
14629 if (type
&& cxx_dialect
< cxx11
14630 && itk
> itk_unsigned_long
)
14631 pedwarn (input_location
, OPT_Wlong_long
,
14633 incremented enumerator value is too large for %<unsigned long%>") : G_("\
14634 incremented enumerator value is too large for %<long%>"));
14636 if (type
== NULL_TREE
)
14639 value
= wide_int_to_tree (type
, wi
);
14644 error ("overflow in enumeration values at %qD", name
);
14645 value
= error_mark_node
;
14650 value
= integer_zero_node
;
14653 /* Remove no-op casts from the value. */
14654 STRIP_TYPE_NOPS (value
);
14656 /* If the underlying type of the enum is fixed, check whether
14657 the enumerator values fits in the underlying type. If it
14658 does not fit, the program is ill-formed [C++0x dcl.enum]. */
14659 if (ENUM_UNDERLYING_TYPE (enumtype
)
14661 && TREE_CODE (value
) == INTEGER_CST
)
14663 if (!int_fits_type_p (value
, ENUM_UNDERLYING_TYPE (enumtype
)))
14664 error ("enumerator value %qE is outside the range of underlying "
14665 "type %qT", value
, ENUM_UNDERLYING_TYPE (enumtype
));
14667 /* Convert the value to the appropriate type. */
14668 value
= fold_convert (ENUM_UNDERLYING_TYPE (enumtype
), value
);
14672 /* C++ associates enums with global, function, or class declarations. */
14673 context
= current_scope ();
14675 /* Build the actual enumeration constant. Note that the enumeration
14676 constants have the underlying type of the enum (if it is fixed)
14677 or the type of their initializer (if the underlying type of the
14678 enum is not fixed):
14682 If the underlying type is fixed, the type of each enumerator
14683 prior to the closing brace is the underlying type; if the
14684 initializing value of an enumerator cannot be represented by
14685 the underlying type, the program is ill-formed. If the
14686 underlying type is not fixed, the type of each enumerator is
14687 the type of its initializing value.
14689 If the underlying type is not fixed, it will be computed by
14690 finish_enum and we will reset the type of this enumerator. Of
14691 course, if we're processing a template, there may be no value. */
14692 type
= value
? TREE_TYPE (value
) : NULL_TREE
;
14694 decl
= build_decl (loc
, CONST_DECL
, name
, type
);
14696 DECL_CONTEXT (decl
) = enumtype
;
14697 TREE_CONSTANT (decl
) = 1;
14698 TREE_READONLY (decl
) = 1;
14699 DECL_INITIAL (decl
) = value
;
14702 cplus_decl_attributes (&decl
, attributes
, 0);
14704 if (context
&& context
== current_class_type
&& !SCOPED_ENUM_P (enumtype
))
14706 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
14707 on the TYPE_FIELDS list for `S'. (That's so that you can say
14708 things like `S::i' later.) */
14710 /* The enumerator may be getting declared outside of its enclosing
14713 class S { public: enum E : int; }; enum S::E : int { i = 7; };
14715 For which case we need to make sure that the access of `S::i'
14716 matches the access of `S::E'. */
14717 tree saved_cas
= current_access_specifier
;
14718 if (TREE_PRIVATE (TYPE_NAME (enumtype
)))
14719 current_access_specifier
= access_private_node
;
14720 else if (TREE_PROTECTED (TYPE_NAME (enumtype
)))
14721 current_access_specifier
= access_protected_node
;
14723 current_access_specifier
= access_public_node
;
14725 finish_member_declaration (decl
);
14727 current_access_specifier
= saved_cas
;
14732 /* Add this enumeration constant to the list for this type. */
14733 TYPE_VALUES (enumtype
) = tree_cons (name
, decl
, TYPE_VALUES (enumtype
));
14736 /* Look for an enumerator with the given NAME within the enumeration
14737 type ENUMTYPE. This routine is used primarily for qualified name
14738 lookup into an enumerator in C++0x, e.g.,
14740 enum class Color { Red, Green, Blue };
14742 Color color = Color::Red;
14744 Returns the value corresponding to the enumerator, or
14745 NULL_TREE if no such enumerator was found. */
14747 lookup_enumerator (tree enumtype
, tree name
)
14750 gcc_assert (enumtype
&& TREE_CODE (enumtype
) == ENUMERAL_TYPE
);
14752 e
= purpose_member (name
, TYPE_VALUES (enumtype
));
14753 return e
? TREE_VALUE (e
) : NULL_TREE
;
14757 /* We're defining DECL. Make sure that its type is OK. */
14760 check_function_type (tree decl
, tree current_function_parms
)
14762 tree fntype
= TREE_TYPE (decl
);
14763 tree return_type
= complete_type (TREE_TYPE (fntype
));
14765 /* In a function definition, arg types must be complete. */
14766 require_complete_types_for_parms (current_function_parms
);
14768 if (dependent_type_p (return_type
)
14769 || type_uses_auto (return_type
))
14771 if (!COMPLETE_OR_VOID_TYPE_P (return_type
))
14773 tree args
= TYPE_ARG_TYPES (fntype
);
14775 error ("return type %q#T is incomplete", return_type
);
14777 /* Make it return void instead. */
14778 if (TREE_CODE (fntype
) == METHOD_TYPE
)
14779 fntype
= build_method_type_directly (TREE_TYPE (TREE_VALUE (args
)),
14781 TREE_CHAIN (args
));
14783 fntype
= build_function_type (void_type_node
, args
);
14785 = build_exception_variant (fntype
,
14786 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl
)));
14787 fntype
= (cp_build_type_attribute_variant
14788 (fntype
, TYPE_ATTRIBUTES (TREE_TYPE (decl
))));
14789 TREE_TYPE (decl
) = fntype
;
14793 abstract_virtuals_error (decl
, TREE_TYPE (fntype
));
14794 maybe_warn_parm_abi (TREE_TYPE (fntype
),
14795 DECL_SOURCE_LOCATION (decl
));
14799 /* True iff FN is an implicitly-defined default constructor. */
14802 implicit_default_ctor_p (tree fn
)
14804 return (DECL_CONSTRUCTOR_P (fn
)
14805 && !user_provided_p (fn
)
14806 && sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (fn
)));
14809 /* Clobber the contents of *this to let the back end know that the object
14810 storage is dead when we enter the constructor or leave the destructor. */
14813 build_clobber_this ()
14815 /* Clobbering an empty base is pointless, and harmful if its one byte
14816 TYPE_SIZE overlays real data. */
14817 if (is_empty_class (current_class_type
))
14820 /* If we have virtual bases, clobber the whole object, but only if we're in
14821 charge. If we don't have virtual bases, clobber the as-base type so we
14822 don't mess with tail padding. */
14823 bool vbases
= CLASSTYPE_VBASECLASSES (current_class_type
);
14825 tree ctype
= current_class_type
;
14827 ctype
= CLASSTYPE_AS_BASE (ctype
);
14829 tree clobber
= build_constructor (ctype
, NULL
);
14830 TREE_THIS_VOLATILE (clobber
) = true;
14832 tree thisref
= current_class_ref
;
14833 if (ctype
!= current_class_type
)
14835 thisref
= build_nop (build_reference_type (ctype
), current_class_ptr
);
14836 thisref
= convert_from_reference (thisref
);
14839 tree exprstmt
= build2 (MODIFY_EXPR
, void_type_node
, thisref
, clobber
);
14841 exprstmt
= build_if_in_charge (exprstmt
);
14846 /* Create the FUNCTION_DECL for a function definition.
14847 DECLSPECS and DECLARATOR are the parts of the declaration;
14848 they describe the function's name and the type it returns,
14849 but twisted together in a fashion that parallels the syntax of C.
14851 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
14852 DECLARATOR is really the DECL for the function we are about to
14853 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
14854 indicating that the function is an inline defined in-class.
14856 This function creates a binding context for the function body
14857 as well as setting up the FUNCTION_DECL in current_function_decl.
14859 For C++, we must first check whether that datum makes any sense.
14860 For example, "class A local_a(1,2);" means that variable local_a
14861 is an aggregate of type A, which should have a constructor
14862 applied to it with the argument list [1, 2].
14864 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
14865 or may be a BLOCK if the function has been defined previously
14866 in this translation unit. On exit, DECL_INITIAL (decl1) will be
14867 error_mark_node if the function has never been defined, or
14868 a BLOCK if the function has been defined somewhere. */
14871 start_preparsed_function (tree decl1
, tree attrs
, int flags
)
14873 tree ctype
= NULL_TREE
;
14876 int doing_friend
= 0;
14877 cp_binding_level
*bl
;
14878 tree current_function_parms
;
14879 struct c_fileinfo
*finfo
14880 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1
)));
14881 bool honor_interface
;
14883 /* Sanity check. */
14884 gcc_assert (VOID_TYPE_P (TREE_VALUE (void_list_node
)));
14885 gcc_assert (TREE_CHAIN (void_list_node
) == NULL_TREE
);
14887 fntype
= TREE_TYPE (decl1
);
14888 if (TREE_CODE (fntype
) == METHOD_TYPE
)
14889 ctype
= TYPE_METHOD_BASETYPE (fntype
);
14891 /* ISO C++ 11.4/5. A friend function defined in a class is in
14892 the (lexical) scope of the class in which it is defined. */
14893 if (!ctype
&& DECL_FRIEND_P (decl1
))
14895 ctype
= DECL_FRIEND_CONTEXT (decl1
);
14897 /* CTYPE could be null here if we're dealing with a template;
14898 for example, `inline friend float foo()' inside a template
14899 will have no CTYPE set. */
14900 if (ctype
&& TREE_CODE (ctype
) != RECORD_TYPE
)
14906 if (DECL_DECLARED_INLINE_P (decl1
)
14907 && lookup_attribute ("noinline", attrs
))
14908 warning_at (DECL_SOURCE_LOCATION (decl1
), 0,
14909 "inline function %qD given attribute noinline", decl1
);
14911 /* Handle gnu_inline attribute. */
14912 if (GNU_INLINE_P (decl1
))
14914 DECL_EXTERNAL (decl1
) = 1;
14915 DECL_NOT_REALLY_EXTERN (decl1
) = 0;
14916 DECL_INTERFACE_KNOWN (decl1
) = 1;
14917 DECL_DISREGARD_INLINE_LIMITS (decl1
) = 1;
14920 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1
))
14921 /* This is a constructor, we must ensure that any default args
14922 introduced by this definition are propagated to the clones
14923 now. The clones are used directly in overload resolution. */
14924 adjust_clone_args (decl1
);
14926 /* Sometimes we don't notice that a function is a static member, and
14927 build a METHOD_TYPE for it. Fix that up now. */
14928 gcc_assert (!(ctype
!= NULL_TREE
&& DECL_STATIC_FUNCTION_P (decl1
)
14929 && TREE_CODE (TREE_TYPE (decl1
)) == METHOD_TYPE
));
14931 /* Set up current_class_type, and enter the scope of the class, if
14934 push_nested_class (ctype
);
14935 else if (DECL_STATIC_FUNCTION_P (decl1
))
14936 push_nested_class (DECL_CONTEXT (decl1
));
14938 /* Now that we have entered the scope of the class, we must restore
14939 the bindings for any template parameters surrounding DECL1, if it
14940 is an inline member template. (Order is important; consider the
14941 case where a template parameter has the same name as a field of
14942 the class.) It is not until after this point that
14943 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
14944 if (flags
& SF_INCLASS_INLINE
)
14945 maybe_begin_member_template_processing (decl1
);
14947 /* Effective C++ rule 15. */
14949 && DECL_ASSIGNMENT_OPERATOR_P (decl1
)
14950 && DECL_OVERLOADED_OPERATOR_IS (decl1
, NOP_EXPR
)
14951 && VOID_TYPE_P (TREE_TYPE (fntype
)))
14952 warning (OPT_Weffc__
,
14953 "%<operator=%> should return a reference to %<*this%>");
14955 /* Make the init_value nonzero so pushdecl knows this is not tentative.
14956 error_mark_node is replaced below (in poplevel) with the BLOCK. */
14957 if (!DECL_INITIAL (decl1
))
14958 DECL_INITIAL (decl1
) = error_mark_node
;
14960 /* This function exists in static storage.
14961 (This does not mean `static' in the C sense!) */
14962 TREE_STATIC (decl1
) = 1;
14964 /* We must call push_template_decl after current_class_type is set
14965 up. (If we are processing inline definitions after exiting a
14966 class scope, current_class_type will be NULL_TREE until set above
14967 by push_nested_class.) */
14968 if (processing_template_decl
)
14970 tree newdecl1
= push_template_decl (decl1
);
14971 if (newdecl1
== error_mark_node
)
14973 if (ctype
|| DECL_STATIC_FUNCTION_P (decl1
))
14974 pop_nested_class ();
14980 /* Make sure the parameter and return types are reasonable. When
14981 you declare a function, these types can be incomplete, but they
14982 must be complete when you define the function. */
14983 check_function_type (decl1
, DECL_ARGUMENTS (decl1
));
14985 /* Build the return declaration for the function. */
14986 restype
= TREE_TYPE (fntype
);
14988 if (DECL_RESULT (decl1
) == NULL_TREE
)
14992 resdecl
= build_decl (input_location
, RESULT_DECL
, 0, restype
);
14993 DECL_ARTIFICIAL (resdecl
) = 1;
14994 DECL_IGNORED_P (resdecl
) = 1;
14995 DECL_RESULT (decl1
) = resdecl
;
14997 cp_apply_type_quals_to_decl (cp_type_quals (restype
), resdecl
);
15000 /* Record the decl so that the function name is defined.
15001 If we already have a decl for this name, and it is a FUNCTION_DECL,
15002 use the old decl. */
15003 if (!processing_template_decl
&& !(flags
& SF_PRE_PARSED
))
15005 /* A specialization is not used to guide overload resolution. */
15006 if (!DECL_FUNCTION_MEMBER_P (decl1
)
15007 && !(DECL_USE_TEMPLATE (decl1
) &&
15008 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1
))))
15010 tree olddecl
= pushdecl (decl1
);
15012 if (olddecl
== error_mark_node
)
15013 /* If something went wrong when registering the declaration,
15014 use DECL1; we have to have a FUNCTION_DECL to use when
15015 parsing the body of the function. */
15019 /* Otherwise, OLDDECL is either a previous declaration
15020 of the same function or DECL1 itself. */
15022 if (warn_missing_declarations
15023 && olddecl
== decl1
15024 && !DECL_MAIN_P (decl1
)
15025 && TREE_PUBLIC (decl1
)
15026 && !DECL_DECLARED_INLINE_P (decl1
))
15030 /* Check whether DECL1 is in an anonymous
15032 for (context
= DECL_CONTEXT (decl1
);
15034 context
= DECL_CONTEXT (context
))
15036 if (TREE_CODE (context
) == NAMESPACE_DECL
15037 && DECL_NAME (context
) == NULL_TREE
)
15041 if (context
== NULL
)
15042 warning_at (DECL_SOURCE_LOCATION (decl1
),
15043 OPT_Wmissing_declarations
,
15044 "no previous declaration for %qD", decl1
);
15052 /* We need to set the DECL_CONTEXT. */
15053 if (!DECL_CONTEXT (decl1
) && DECL_TEMPLATE_INFO (decl1
))
15054 DECL_CONTEXT (decl1
) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1
));
15056 fntype
= TREE_TYPE (decl1
);
15057 restype
= TREE_TYPE (fntype
);
15059 /* If #pragma weak applies, mark the decl appropriately now.
15060 The pragma only applies to global functions. Because
15061 determining whether or not the #pragma applies involves
15062 computing the mangled name for the declaration, we cannot
15063 apply the pragma until after we have merged this declaration
15064 with any previous declarations; if the original declaration
15065 has a linkage specification, that specification applies to
15066 the definition as well, and may affect the mangled name. */
15067 if (DECL_FILE_SCOPE_P (decl1
))
15068 maybe_apply_pragma_weak (decl1
);
15071 /* We are now in the scope of the function being defined. */
15072 current_function_decl
= decl1
;
15074 /* Save the parm names or decls from this function's declarator
15075 where store_parm_decls will find them. */
15076 current_function_parms
= DECL_ARGUMENTS (decl1
);
15078 /* Let the user know we're compiling this function. */
15079 announce_function (decl1
);
15081 gcc_assert (DECL_INITIAL (decl1
));
15083 /* This function may already have been parsed, in which case just
15084 return; our caller will skip over the body without parsing. */
15085 if (DECL_INITIAL (decl1
) != error_mark_node
)
15088 /* Initialize RTL machinery. We cannot do this until
15089 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
15090 even when processing a template; this is how we get
15091 CFUN set up, and our per-function variables initialized.
15092 FIXME factor out the non-RTL stuff. */
15093 bl
= current_binding_level
;
15094 allocate_struct_function (decl1
, processing_template_decl
);
15096 /* Initialize the language data structures. Whenever we start
15097 a new function, we destroy temporaries in the usual way. */
15098 cfun
->language
= ggc_cleared_alloc
<language_function
> ();
15099 current_stmt_tree ()->stmts_are_full_exprs_p
= 1;
15100 current_binding_level
= bl
;
15102 if (!processing_template_decl
&& type_uses_auto (restype
))
15104 FNDECL_USED_AUTO (decl1
) = true;
15105 current_function_auto_return_pattern
= restype
;
15108 /* Start the statement-tree, start the tree now. */
15109 DECL_SAVED_TREE (decl1
) = push_stmt_list ();
15111 /* If we are (erroneously) defining a function that we have already
15112 defined before, wipe out what we knew before. */
15113 if (!DECL_PENDING_INLINE_P (decl1
))
15114 DECL_SAVED_FUNCTION_DATA (decl1
) = NULL
;
15116 if (ctype
&& !doing_friend
&& !DECL_STATIC_FUNCTION_P (decl1
))
15118 /* We know that this was set up by `grokclassfn'. We do not
15119 wait until `store_parm_decls', since evil parse errors may
15120 never get us to that point. Here we keep the consistency
15121 between `current_class_type' and `current_class_ptr'. */
15122 tree t
= DECL_ARGUMENTS (decl1
);
15124 gcc_assert (t
!= NULL_TREE
&& TREE_CODE (t
) == PARM_DECL
);
15125 gcc_assert (TYPE_PTR_P (TREE_TYPE (t
)));
15127 cp_function_chain
->x_current_class_ref
15128 = cp_build_fold_indirect_ref (t
);
15129 /* Set this second to avoid shortcut in cp_build_indirect_ref. */
15130 cp_function_chain
->x_current_class_ptr
= t
;
15132 /* Constructors and destructors need to know whether they're "in
15133 charge" of initializing virtual base classes. */
15134 t
= DECL_CHAIN (t
);
15135 if (DECL_HAS_IN_CHARGE_PARM_P (decl1
))
15137 current_in_charge_parm
= t
;
15138 t
= DECL_CHAIN (t
);
15140 if (DECL_HAS_VTT_PARM_P (decl1
))
15142 gcc_assert (DECL_NAME (t
) == vtt_parm_identifier
);
15143 current_vtt_parm
= t
;
15147 honor_interface
= (!DECL_TEMPLATE_INSTANTIATION (decl1
)
15148 /* Implicitly-defined methods (like the
15149 destructor for a class in which no destructor
15150 is explicitly declared) must not be defined
15151 until their definition is needed. So, we
15152 ignore interface specifications for
15153 compiler-generated functions. */
15154 && !DECL_ARTIFICIAL (decl1
));
15156 if (processing_template_decl
)
15157 /* Don't mess with interface flags. */;
15158 else if (DECL_INTERFACE_KNOWN (decl1
))
15160 tree ctx
= decl_function_context (decl1
);
15162 if (DECL_NOT_REALLY_EXTERN (decl1
))
15163 DECL_EXTERNAL (decl1
) = 0;
15165 if (ctx
!= NULL_TREE
&& vague_linkage_p (ctx
))
15166 /* This is a function in a local class in an extern inline
15167 or template function. */
15168 comdat_linkage (decl1
);
15170 /* If this function belongs to an interface, it is public.
15171 If it belongs to someone else's interface, it is also external.
15172 This only affects inlines and template instantiations. */
15173 else if (!finfo
->interface_unknown
&& honor_interface
)
15175 if (DECL_DECLARED_INLINE_P (decl1
)
15176 || DECL_TEMPLATE_INSTANTIATION (decl1
))
15178 DECL_EXTERNAL (decl1
)
15179 = (finfo
->interface_only
15180 || (DECL_DECLARED_INLINE_P (decl1
)
15181 && ! flag_implement_inlines
15182 && !DECL_VINDEX (decl1
)));
15184 /* For WIN32 we also want to put these in linkonce sections. */
15185 maybe_make_one_only (decl1
);
15188 DECL_EXTERNAL (decl1
) = 0;
15189 DECL_INTERFACE_KNOWN (decl1
) = 1;
15190 /* If this function is in an interface implemented in this file,
15191 make sure that the back end knows to emit this function
15193 if (!DECL_EXTERNAL (decl1
))
15194 mark_needed (decl1
);
15196 else if (finfo
->interface_unknown
&& finfo
->interface_only
15197 && honor_interface
)
15199 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
15200 interface, we will have both finfo->interface_unknown and
15201 finfo->interface_only set. In that case, we don't want to
15202 use the normal heuristics because someone will supply a
15203 #pragma implementation elsewhere, and deducing it here would
15204 produce a conflict. */
15205 comdat_linkage (decl1
);
15206 DECL_EXTERNAL (decl1
) = 0;
15207 DECL_INTERFACE_KNOWN (decl1
) = 1;
15208 DECL_DEFER_OUTPUT (decl1
) = 1;
15212 /* This is a definition, not a reference.
15213 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
15214 if (!GNU_INLINE_P (decl1
))
15215 DECL_EXTERNAL (decl1
) = 0;
15217 if ((DECL_DECLARED_INLINE_P (decl1
)
15218 || DECL_TEMPLATE_INSTANTIATION (decl1
))
15219 && ! DECL_INTERFACE_KNOWN (decl1
))
15220 DECL_DEFER_OUTPUT (decl1
) = 1;
15222 DECL_INTERFACE_KNOWN (decl1
) = 1;
15225 /* Determine the ELF visibility attribute for the function. We must not
15226 do this before calling "pushdecl", as we must allow "duplicate_decls"
15227 to merge any attributes appropriately. We also need to wait until
15229 if (!DECL_CLONED_FUNCTION_P (decl1
))
15230 determine_visibility (decl1
);
15232 if (!processing_template_decl
)
15233 maybe_instantiate_noexcept (decl1
);
15235 begin_scope (sk_function_parms
, decl1
);
15239 if (DECL_DESTRUCTOR_P (decl1
)
15240 || (DECL_CONSTRUCTOR_P (decl1
)
15241 && targetm
.cxx
.cdtor_returns_this ()))
15243 cdtor_label
= create_artificial_label (input_location
);
15244 LABEL_DECL_CDTOR (cdtor_label
) = true;
15247 start_fname_decls ();
15249 store_parm_decls (current_function_parms
);
15251 if (!processing_template_decl
15252 && (flag_lifetime_dse
> 1)
15253 && DECL_CONSTRUCTOR_P (decl1
)
15254 && !DECL_CLONED_FUNCTION_P (decl1
)
15255 /* Clobbering an empty base is harmful if it overlays real data. */
15256 && !is_empty_class (current_class_type
)
15257 /* We can't clobber safely for an implicitly-defined default constructor
15258 because part of the initialization might happen before we enter the
15259 constructor, via AGGR_INIT_ZERO_FIRST (c++/68006). */
15260 && !implicit_default_ctor_p (decl1
))
15261 finish_expr_stmt (build_clobber_this ());
15263 if (!processing_template_decl
15264 && DECL_CONSTRUCTOR_P (decl1
)
15265 && sanitize_flags_p (SANITIZE_VPTR
)
15266 && !DECL_CLONED_FUNCTION_P (decl1
)
15267 && !implicit_default_ctor_p (decl1
))
15268 cp_ubsan_maybe_initialize_vtbl_ptrs (current_class_ptr
);
15270 start_lambda_scope (decl1
);
15276 /* Like start_preparsed_function, except that instead of a
15277 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
15279 Returns true on success. If the DECLARATOR is not suitable
15280 for a function, we return false, which tells the parser to
15281 skip the entire function. */
15284 start_function (cp_decl_specifier_seq
*declspecs
,
15285 const cp_declarator
*declarator
,
15290 decl1
= grokdeclarator (declarator
, declspecs
, FUNCDEF
, 1, &attrs
);
15291 invoke_plugin_callbacks (PLUGIN_START_PARSE_FUNCTION
, decl1
);
15292 if (decl1
== error_mark_node
)
15294 /* If the declarator is not suitable for a function definition,
15295 cause a syntax error. */
15296 if (decl1
== NULL_TREE
|| TREE_CODE (decl1
) != FUNCTION_DECL
)
15298 error ("invalid function declaration");
15302 if (DECL_MAIN_P (decl1
))
15303 /* main must return int. grokfndecl should have corrected it
15304 (and issued a diagnostic) if the user got it wrong. */
15305 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1
)),
15306 integer_type_node
));
15308 return start_preparsed_function (decl1
, attrs
, /*flags=*/SF_DEFAULT
);
15311 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
15315 use_eh_spec_block (tree fn
)
15317 return (flag_exceptions
&& flag_enforce_eh_specs
15318 && !processing_template_decl
15319 && !type_throw_all_p (TREE_TYPE (fn
))
15320 /* We insert the EH_SPEC_BLOCK only in the original
15321 function; then, it is copied automatically to the
15323 && !DECL_CLONED_FUNCTION_P (fn
)
15324 /* Implicitly-generated constructors and destructors have
15325 exception specifications. However, those specifications
15326 are the union of the possible exceptions specified by the
15327 constructors/destructors for bases and members, so no
15328 unallowed exception will ever reach this function. By
15329 not creating the EH_SPEC_BLOCK we save a little memory,
15330 and we avoid spurious warnings about unreachable
15332 && !DECL_DEFAULTED_FN (fn
));
15335 /* Store the parameter declarations into the current function declaration.
15336 This is called after parsing the parameter declarations, before
15337 digesting the body of the function.
15339 Also install to binding contour return value identifier, if any. */
15342 store_parm_decls (tree current_function_parms
)
15344 tree fndecl
= current_function_decl
;
15347 /* This is a chain of any other decls that came in among the parm
15348 declarations. If a parm is declared with enum {foo, bar} x;
15349 then CONST_DECLs for foo and bar are put here. */
15350 tree nonparms
= NULL_TREE
;
15352 if (current_function_parms
)
15354 /* This case is when the function was defined with an ANSI prototype.
15355 The parms already have decls, so we need not do anything here
15356 except record them as in effect
15357 and complain if any redundant old-style parm decls were written. */
15359 tree specparms
= current_function_parms
;
15362 /* Must clear this because it might contain TYPE_DECLs declared
15364 current_binding_level
->names
= NULL
;
15366 /* If we're doing semantic analysis, then we'll call pushdecl
15367 for each of these. We must do them in reverse order so that
15368 they end in the correct forward order. */
15369 specparms
= nreverse (specparms
);
15371 for (parm
= specparms
; parm
; parm
= next
)
15373 next
= DECL_CHAIN (parm
);
15374 if (TREE_CODE (parm
) == PARM_DECL
)
15378 /* If we find an enum constant or a type tag,
15379 put it aside for the moment. */
15380 TREE_CHAIN (parm
) = NULL_TREE
;
15381 nonparms
= chainon (nonparms
, parm
);
15385 /* Get the decls in their original chain order and record in the
15386 function. This is all and only the PARM_DECLs that were
15387 pushed into scope by the loop above. */
15388 DECL_ARGUMENTS (fndecl
) = get_local_decls ();
15391 DECL_ARGUMENTS (fndecl
) = NULL_TREE
;
15393 /* Now store the final chain of decls for the arguments
15394 as the decl-chain of the current lexical scope.
15395 Put the enumerators in as well, at the front so that
15396 DECL_ARGUMENTS is not modified. */
15397 current_binding_level
->names
= chainon (nonparms
, DECL_ARGUMENTS (fndecl
));
15399 if (use_eh_spec_block (current_function_decl
))
15400 current_eh_spec_block
= begin_eh_spec_block ();
15404 /* We have finished doing semantic analysis on DECL, but have not yet
15405 generated RTL for its body. Save away our current state, so that
15406 when we want to generate RTL later we know what to do. */
15409 save_function_data (tree decl
)
15411 struct language_function
*f
;
15413 /* Save the language-specific per-function data so that we can
15414 get it back when we really expand this function. */
15415 gcc_assert (!DECL_PENDING_INLINE_P (decl
));
15418 f
= ggc_alloc
<language_function
> ();
15419 memcpy (f
, cp_function_chain
, sizeof (struct language_function
));
15420 DECL_SAVED_FUNCTION_DATA (decl
) = f
;
15422 /* Clear out the bits we don't need. */
15423 f
->base
.x_stmt_tree
.x_cur_stmt_list
= NULL
;
15424 f
->bindings
= NULL
;
15425 f
->x_local_names
= NULL
;
15426 f
->base
.local_typedefs
= NULL
;
15430 /* Set the return value of the constructor (if present). */
15433 finish_constructor_body (void)
15438 if (targetm
.cxx
.cdtor_returns_this ())
15440 /* Any return from a constructor will end up here. */
15441 add_stmt (build_stmt (input_location
, LABEL_EXPR
, cdtor_label
));
15443 val
= DECL_ARGUMENTS (current_function_decl
);
15444 val
= build2 (MODIFY_EXPR
, TREE_TYPE (val
),
15445 DECL_RESULT (current_function_decl
), val
);
15446 /* Return the address of the object. */
15447 exprstmt
= build_stmt (input_location
, RETURN_EXPR
, val
);
15448 add_stmt (exprstmt
);
15452 /* Do all the processing for the beginning of a destructor; set up the
15453 vtable pointers and cleanups for bases and members. */
15456 begin_destructor_body (void)
15458 tree compound_stmt
;
15460 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
15461 issued an error message. We still want to try to process the
15462 body of the function, but initialize_vtbl_ptrs will crash if
15463 TYPE_BINFO is NULL. */
15464 if (COMPLETE_TYPE_P (current_class_type
))
15466 compound_stmt
= begin_compound_stmt (0);
15467 /* Make all virtual function table pointers in non-virtual base
15468 classes point to CURRENT_CLASS_TYPE's virtual function
15470 initialize_vtbl_ptrs (current_class_ptr
);
15471 finish_compound_stmt (compound_stmt
);
15473 if (flag_lifetime_dse
15474 /* Clobbering an empty base is harmful if it overlays real data. */
15475 && !is_empty_class (current_class_type
))
15477 if (sanitize_flags_p (SANITIZE_VPTR
)
15478 && (flag_sanitize_recover
& SANITIZE_VPTR
) == 0
15479 && TYPE_CONTAINS_VPTR_P (current_class_type
))
15481 tree binfo
= TYPE_BINFO (current_class_type
);
15483 = cp_build_fold_indirect_ref (current_class_ptr
);
15485 tree vtbl_ptr
= build_vfield_ref (ref
, TREE_TYPE (binfo
));
15486 tree vtbl
= build_zero_cst (TREE_TYPE (vtbl_ptr
));
15487 tree stmt
= cp_build_modify_expr (input_location
, vtbl_ptr
,
15489 tf_warning_or_error
);
15490 finish_decl_cleanup (NULL_TREE
, stmt
);
15493 finish_decl_cleanup (NULL_TREE
, build_clobber_this ());
15496 /* And insert cleanups for our bases and members so that they
15497 will be properly destroyed if we throw. */
15498 push_base_cleanups ();
15502 /* At the end of every destructor we generate code to delete the object if
15503 necessary. Do that now. */
15506 finish_destructor_body (void)
15510 /* Any return from a destructor will end up here; that way all base
15511 and member cleanups will be run when the function returns. */
15512 add_stmt (build_stmt (input_location
, LABEL_EXPR
, cdtor_label
));
15514 if (targetm
.cxx
.cdtor_returns_this ())
15518 val
= DECL_ARGUMENTS (current_function_decl
);
15519 val
= build2 (MODIFY_EXPR
, TREE_TYPE (val
),
15520 DECL_RESULT (current_function_decl
), val
);
15521 /* Return the address of the object. */
15522 exprstmt
= build_stmt (input_location
, RETURN_EXPR
, val
);
15523 add_stmt (exprstmt
);
15527 /* Do the necessary processing for the beginning of a function body, which
15528 in this case includes member-initializers, but not the catch clauses of
15529 a function-try-block. Currently, this means opening a binding level
15530 for the member-initializers (in a ctor), member cleanups (in a dtor),
15531 and capture proxies (in a lambda operator()). */
15534 begin_function_body (void)
15538 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl
))
15541 if (processing_template_decl
)
15542 /* Do nothing now. */;
15544 /* Always keep the BLOCK node associated with the outermost pair of
15545 curly braces of a function. These are needed for correct
15546 operation of dwarfout.c. */
15547 keep_next_level (true);
15549 stmt
= begin_compound_stmt (BCS_FN_BODY
);
15551 if (processing_template_decl
)
15552 /* Do nothing now. */;
15553 else if (DECL_DESTRUCTOR_P (current_function_decl
))
15554 begin_destructor_body ();
15559 /* Do the processing for the end of a function body. Currently, this means
15560 closing out the cleanups for fully-constructed bases and members, and in
15561 the case of the destructor, deleting the object if desired. Again, this
15562 is only meaningful for [cd]tors, since they are the only functions where
15563 there is a significant distinction between the main body and any
15564 function catch clauses. Handling, say, main() return semantics here
15565 would be wrong, as flowing off the end of a function catch clause for
15566 main() would also need to return 0. */
15569 finish_function_body (tree compstmt
)
15571 if (compstmt
== NULL_TREE
)
15574 /* Close the block. */
15575 finish_compound_stmt (compstmt
);
15577 if (processing_template_decl
)
15578 /* Do nothing now. */;
15579 else if (DECL_CONSTRUCTOR_P (current_function_decl
))
15580 finish_constructor_body ();
15581 else if (DECL_DESTRUCTOR_P (current_function_decl
))
15582 finish_destructor_body ();
15585 /* Given a function, returns the BLOCK corresponding to the outermost level
15586 of curly braces, skipping the artificial block created for constructor
15590 outer_curly_brace_block (tree fndecl
)
15592 tree block
= DECL_INITIAL (fndecl
);
15593 if (BLOCK_OUTER_CURLY_BRACE_P (block
))
15595 block
= BLOCK_SUBBLOCKS (block
);
15596 if (BLOCK_OUTER_CURLY_BRACE_P (block
))
15598 block
= BLOCK_SUBBLOCKS (block
);
15599 gcc_assert (BLOCK_OUTER_CURLY_BRACE_P (block
));
15603 /* If FNDECL is a class's key method, add the class to the list of
15604 keyed classes that should be emitted. */
15607 record_key_method_defined (tree fndecl
)
15609 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl
)
15610 && DECL_VIRTUAL_P (fndecl
)
15611 && !processing_template_decl
)
15613 tree fnclass
= DECL_CONTEXT (fndecl
);
15614 if (fndecl
== CLASSTYPE_KEY_METHOD (fnclass
))
15615 vec_safe_push (keyed_classes
, fnclass
);
15619 /* Subroutine of finish_function.
15620 Save the body of constexpr functions for possible
15621 future compile time evaluation. */
15624 maybe_save_function_definition (tree fun
)
15626 if (!processing_template_decl
15627 && DECL_DECLARED_CONSTEXPR_P (fun
)
15628 && !cp_function_chain
->invalid_constexpr
15629 && !DECL_CLONED_FUNCTION_P (fun
))
15630 register_constexpr_fundef (fun
, DECL_SAVED_TREE (fun
));
15633 /* Finish up a function declaration and compile that function
15634 all the way to assembler language output. The free the storage
15635 for the function definition. INLINE_P is TRUE if we just
15636 finished processing the body of an in-class inline function
15637 definition. (This processing will have taken place after the
15638 class definition is complete.) */
15641 finish_function (bool inline_p
)
15643 tree fndecl
= current_function_decl
;
15644 tree fntype
, ctype
= NULL_TREE
;
15646 /* When we get some parse errors, we can end up without a
15647 current_function_decl, so cope. */
15648 if (fndecl
== NULL_TREE
)
15649 return error_mark_node
;
15651 finish_lambda_scope ();
15653 if (c_dialect_objc ())
15654 objc_finish_function ();
15656 record_key_method_defined (fndecl
);
15658 fntype
= TREE_TYPE (fndecl
);
15660 /* TREE_READONLY (fndecl) = 1;
15661 This caused &foo to be of type ptr-to-const-function
15662 which then got a warning when stored in a ptr-to-function variable. */
15664 gcc_assert (building_stmt_list_p ());
15665 /* The current function is being defined, so its DECL_INITIAL should
15666 be set, and unless there's a multiple definition, it should be
15667 error_mark_node. */
15668 gcc_assert (DECL_INITIAL (fndecl
) == error_mark_node
);
15670 /* For a cloned function, we've already got all the code we need;
15671 there's no need to add any extra bits. */
15672 if (!DECL_CLONED_FUNCTION_P (fndecl
))
15674 /* Make it so that `main' always returns 0 by default. */
15675 if (DECL_MAIN_P (current_function_decl
))
15676 finish_return_stmt (integer_zero_node
);
15678 if (use_eh_spec_block (current_function_decl
))
15679 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
15680 (TREE_TYPE (current_function_decl
)),
15681 current_eh_spec_block
);
15684 /* If we're saving up tree structure, tie off the function now. */
15685 DECL_SAVED_TREE (fndecl
) = pop_stmt_list (DECL_SAVED_TREE (fndecl
));
15687 finish_fname_decls ();
15689 /* If this function can't throw any exceptions, remember that. */
15690 if (!processing_template_decl
15691 && !cp_function_chain
->can_throw
15692 && !flag_non_call_exceptions
15693 && !decl_replaceable_p (fndecl
))
15694 TREE_NOTHROW (fndecl
) = 1;
15696 /* This must come after expand_function_end because cleanups might
15697 have declarations (from inline functions) that need to go into
15698 this function's blocks. */
15700 /* If the current binding level isn't the outermost binding level
15701 for this function, either there is a bug, or we have experienced
15702 syntax errors and the statement tree is malformed. */
15703 if (current_binding_level
->kind
!= sk_function_parms
)
15705 /* Make sure we have already experienced errors. */
15706 gcc_assert (errorcount
);
15708 /* Throw away the broken statement tree and extra binding
15710 DECL_SAVED_TREE (fndecl
) = alloc_stmt_list ();
15712 while (current_binding_level
->kind
!= sk_function_parms
)
15714 if (current_binding_level
->kind
== sk_class
)
15715 pop_nested_class ();
15717 poplevel (0, 0, 0);
15720 poplevel (1, 0, 1);
15722 /* Statements should always be full-expressions at the outermost set
15723 of curly braces for a function. */
15724 gcc_assert (stmts_are_full_exprs_p ());
15726 /* If there are no return statements in a function with auto return type,
15727 the return type is void. But if the declared type is something like
15728 auto*, this is an error. */
15729 if (!processing_template_decl
&& FNDECL_USED_AUTO (fndecl
)
15730 && TREE_TYPE (fntype
) == current_function_auto_return_pattern
)
15732 if (is_auto (current_function_auto_return_pattern
))
15734 apply_deduced_return_type (fndecl
, void_type_node
);
15735 fntype
= TREE_TYPE (fndecl
);
15737 else if (!current_function_returns_value
15738 && !current_function_returns_null
)
15740 error ("no return statements in function returning %qT",
15741 current_function_auto_return_pattern
);
15742 inform (input_location
, "only plain %<auto%> return type can be "
15743 "deduced to %<void%>");
15747 // If this is a concept, check that the definition is reasonable.
15748 if (DECL_DECLARED_CONCEPT_P (fndecl
))
15749 check_function_concept (fndecl
);
15751 /* Lambda closure members are implicitly constexpr if possible. */
15752 if (cxx_dialect
>= cxx17
15753 && LAMBDA_TYPE_P (CP_DECL_CONTEXT (fndecl
)))
15754 DECL_DECLARED_CONSTEXPR_P (fndecl
)
15755 = ((processing_template_decl
15756 || is_valid_constexpr_fn (fndecl
, /*complain*/false))
15757 && potential_constant_expression (DECL_SAVED_TREE (fndecl
)));
15759 /* Save constexpr function body before it gets munged by
15760 the NRV transformation. */
15761 maybe_save_function_definition (fndecl
);
15763 /* Invoke the pre-genericize plugin before we start munging things. */
15764 if (!processing_template_decl
)
15765 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE
, fndecl
);
15767 /* Perform delayed folding before NRV transformation. */
15768 if (!processing_template_decl
)
15769 cp_fold_function (fndecl
);
15771 /* Set up the named return value optimization, if we can. Candidate
15772 variables are selected in check_return_expr. */
15773 if (current_function_return_value
)
15775 tree r
= current_function_return_value
;
15778 if (r
!= error_mark_node
15779 /* This is only worth doing for fns that return in memory--and
15780 simpler, since we don't have to worry about promoted modes. */
15781 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl
)), fndecl
)
15782 /* Only allow this for variables declared in the outer scope of
15783 the function so we know that their lifetime always ends with a
15784 return; see g++.dg/opt/nrv6.C. We could be more flexible if
15785 we were to do this optimization in tree-ssa. */
15786 && (outer
= outer_curly_brace_block (fndecl
))
15787 && chain_member (r
, BLOCK_VARS (outer
)))
15788 finalize_nrv (&DECL_SAVED_TREE (fndecl
), r
, DECL_RESULT (fndecl
));
15790 current_function_return_value
= NULL_TREE
;
15793 /* Remember that we were in class scope. */
15794 if (current_class_name
)
15795 ctype
= current_class_type
;
15797 /* Must mark the RESULT_DECL as being in this function. */
15798 DECL_CONTEXT (DECL_RESULT (fndecl
)) = fndecl
;
15800 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
15801 to the FUNCTION_DECL node itself. */
15802 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl
)) = fndecl
;
15804 /* Save away current state, if appropriate. */
15805 if (!processing_template_decl
)
15806 save_function_data (fndecl
);
15808 /* Complain if there's just no return statement. */
15809 if (warn_return_type
15810 && !VOID_TYPE_P (TREE_TYPE (fntype
))
15811 && !dependent_type_p (TREE_TYPE (fntype
))
15812 && !current_function_returns_value
&& !current_function_returns_null
15813 /* Don't complain if we abort or throw. */
15814 && !current_function_returns_abnormally
15815 /* Don't complain if there's an infinite loop. */
15816 && !current_function_infinite_loop
15817 /* Don't complain if we are declared noreturn. */
15818 && !TREE_THIS_VOLATILE (fndecl
)
15819 && !DECL_NAME (DECL_RESULT (fndecl
))
15820 && !TREE_NO_WARNING (fndecl
)
15821 /* Structor return values (if any) are set by the compiler. */
15822 && !DECL_CONSTRUCTOR_P (fndecl
)
15823 && !DECL_DESTRUCTOR_P (fndecl
)
15824 && targetm
.warn_func_return (fndecl
))
15826 warning (OPT_Wreturn_type
,
15827 "no return statement in function returning non-void");
15828 TREE_NO_WARNING (fndecl
) = 1;
15831 /* Store the end of the function, so that we get good line number
15832 info for the epilogue. */
15833 cfun
->function_end_locus
= input_location
;
15835 /* Complain about parameters that are only set, but never otherwise used. */
15836 if (warn_unused_but_set_parameter
15837 && !processing_template_decl
15838 && errorcount
== unused_but_set_errorcount
15839 && !DECL_CLONED_FUNCTION_P (fndecl
))
15843 for (decl
= DECL_ARGUMENTS (fndecl
);
15845 decl
= DECL_CHAIN (decl
))
15846 if (TREE_USED (decl
)
15847 && TREE_CODE (decl
) == PARM_DECL
15848 && !DECL_READ_P (decl
)
15849 && DECL_NAME (decl
)
15850 && !DECL_ARTIFICIAL (decl
)
15851 && !TREE_NO_WARNING (decl
)
15852 && !DECL_IN_SYSTEM_HEADER (decl
)
15853 && TREE_TYPE (decl
) != error_mark_node
15854 && TREE_CODE (TREE_TYPE (decl
)) != REFERENCE_TYPE
15855 && (!CLASS_TYPE_P (TREE_TYPE (decl
))
15856 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl
))))
15857 warning_at (DECL_SOURCE_LOCATION (decl
),
15858 OPT_Wunused_but_set_parameter
,
15859 "parameter %qD set but not used", decl
);
15860 unused_but_set_errorcount
= errorcount
;
15863 /* Complain about locally defined typedefs that are not used in this
15865 maybe_warn_unused_local_typedefs ();
15867 /* Possibly warn about unused parameters. */
15868 if (warn_unused_parameter
15869 && !processing_template_decl
15870 && !DECL_CLONED_FUNCTION_P (fndecl
))
15871 do_warn_unused_parameter (fndecl
);
15873 /* Genericize before inlining. */
15874 if (!processing_template_decl
)
15876 struct language_function
*f
= DECL_SAVED_FUNCTION_DATA (fndecl
);
15877 cp_genericize (fndecl
);
15878 /* Clear out the bits we don't need. */
15879 f
->x_current_class_ptr
= NULL
;
15880 f
->x_current_class_ref
= NULL
;
15881 f
->x_eh_spec_block
= NULL
;
15882 f
->x_in_charge_parm
= NULL
;
15883 f
->x_vtt_parm
= NULL
;
15884 f
->x_return_value
= NULL
;
15885 f
->bindings
= NULL
;
15886 f
->extern_decl_map
= NULL
;
15887 f
->infinite_loops
= NULL
;
15889 /* Clear out the bits we don't need. */
15890 local_names
= NULL
;
15892 /* We're leaving the context of this function, so zap cfun. It's still in
15893 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
15895 current_function_decl
= NULL
;
15897 /* If this is an in-class inline definition, we may have to pop the
15898 bindings for the template parameters that we added in
15899 maybe_begin_member_template_processing when start_function was
15902 maybe_end_member_template_processing ();
15904 /* Leave the scope of the class. */
15906 pop_nested_class ();
15911 current_function_decl
= NULL_TREE
;
15913 invoke_plugin_callbacks (PLUGIN_FINISH_PARSE_FUNCTION
, fndecl
);
15917 /* Create the FUNCTION_DECL for a function definition.
15918 DECLSPECS and DECLARATOR are the parts of the declaration;
15919 they describe the return type and the name of the function,
15920 but twisted together in a fashion that parallels the syntax of C.
15922 This function creates a binding context for the function body
15923 as well as setting up the FUNCTION_DECL in current_function_decl.
15925 Returns a FUNCTION_DECL on success.
15927 If the DECLARATOR is not suitable for a function (it defines a datum
15928 instead), we return 0, which tells yyparse to report a parse error.
15930 May return void_type_node indicating that this method is actually
15931 a friend. See grokfield for more details.
15933 Came here with a `.pushlevel' .
15935 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
15936 CHANGES TO CODE IN `grokfield'. */
15939 grokmethod (cp_decl_specifier_seq
*declspecs
,
15940 const cp_declarator
*declarator
, tree attrlist
)
15942 tree fndecl
= grokdeclarator (declarator
, declspecs
, MEMFUNCDEF
, 0,
15945 if (fndecl
== error_mark_node
)
15946 return error_mark_node
;
15948 if (fndecl
== NULL
|| TREE_CODE (fndecl
) != FUNCTION_DECL
)
15950 error ("invalid member function declaration");
15951 return error_mark_node
;
15955 cplus_decl_attributes (&fndecl
, attrlist
, 0);
15957 /* Pass friends other than inline friend functions back. */
15958 if (fndecl
== void_type_node
)
15961 if (DECL_IN_AGGR_P (fndecl
))
15963 if (DECL_CLASS_SCOPE_P (fndecl
))
15964 error ("%qD is already defined in class %qT", fndecl
,
15965 DECL_CONTEXT (fndecl
));
15966 return error_mark_node
;
15969 check_template_shadow (fndecl
);
15971 if (TREE_PUBLIC (fndecl
))
15972 DECL_COMDAT (fndecl
) = 1;
15973 DECL_DECLARED_INLINE_P (fndecl
) = 1;
15974 DECL_NO_INLINE_WARNING_P (fndecl
) = 1;
15976 /* We process method specializations in finish_struct_1. */
15977 if (processing_template_decl
&& !DECL_TEMPLATE_SPECIALIZATION (fndecl
))
15979 fndecl
= push_template_decl (fndecl
);
15980 if (fndecl
== error_mark_node
)
15984 if (! DECL_FRIEND_P (fndecl
))
15986 if (DECL_CHAIN (fndecl
))
15988 fndecl
= copy_node (fndecl
);
15989 TREE_CHAIN (fndecl
) = NULL_TREE
;
15993 cp_finish_decl (fndecl
, NULL_TREE
, false, NULL_TREE
, 0);
15995 DECL_IN_AGGR_P (fndecl
) = 1;
16000 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
16001 we can lay it out later, when and if its type becomes complete.
16003 Also handle constexpr variables where the initializer involves
16004 an unlowered PTRMEM_CST because the class isn't complete yet. */
16007 maybe_register_incomplete_var (tree var
)
16009 gcc_assert (VAR_P (var
));
16011 /* Keep track of variables with incomplete types. */
16012 if (!processing_template_decl
&& TREE_TYPE (var
) != error_mark_node
16013 && DECL_EXTERNAL (var
))
16015 tree inner_type
= TREE_TYPE (var
);
16017 while (TREE_CODE (inner_type
) == ARRAY_TYPE
)
16018 inner_type
= TREE_TYPE (inner_type
);
16019 inner_type
= TYPE_MAIN_VARIANT (inner_type
);
16021 if ((!COMPLETE_TYPE_P (inner_type
) && CLASS_TYPE_P (inner_type
))
16022 /* RTTI TD entries are created while defining the type_info. */
16023 || (TYPE_LANG_SPECIFIC (inner_type
)
16024 && TYPE_BEING_DEFINED (inner_type
)))
16026 incomplete_var iv
= {var
, inner_type
};
16027 vec_safe_push (incomplete_vars
, iv
);
16029 else if (!(DECL_LANG_SPECIFIC (var
) && DECL_TEMPLATE_INFO (var
))
16030 && decl_constant_var_p (var
)
16031 && (TYPE_PTRMEM_P (inner_type
) || CLASS_TYPE_P (inner_type
)))
16033 /* When the outermost open class is complete we can resolve any
16034 pointers-to-members. */
16035 tree context
= outermost_open_class ();
16036 incomplete_var iv
= {var
, context
};
16037 vec_safe_push (incomplete_vars
, iv
);
16042 /* Called when a class type (given by TYPE) is defined. If there are
16043 any existing VAR_DECLs whose type has been completed by this
16044 declaration, update them now. */
16047 complete_vars (tree type
)
16050 incomplete_var
*iv
;
16052 for (ix
= 0; vec_safe_iterate (incomplete_vars
, ix
, &iv
); )
16054 if (same_type_p (type
, iv
->incomplete_type
))
16056 tree var
= iv
->decl
;
16057 tree type
= TREE_TYPE (var
);
16059 if (type
!= error_mark_node
16060 && (TYPE_MAIN_VARIANT (strip_array_types (type
))
16061 == iv
->incomplete_type
))
16063 /* Complete the type of the variable. The VAR_DECL itself
16064 will be laid out in expand_expr. */
16065 complete_type (type
);
16066 cp_apply_type_quals_to_decl (cp_type_quals (type
), var
);
16069 /* Remove this entry from the list. */
16070 incomplete_vars
->unordered_remove (ix
);
16076 /* Check for pending declarations which may have abstract type. */
16077 complete_type_check_abstract (type
);
16080 /* If DECL is of a type which needs a cleanup, build and return an
16081 expression to perform that cleanup here. Return NULL_TREE if no
16082 cleanup need be done. DECL can also be a _REF when called from
16083 split_nonconstant_init_1. */
16086 cxx_maybe_build_cleanup (tree decl
, tsubst_flags_t complain
)
16092 /* Assume no cleanup is required. */
16093 cleanup
= NULL_TREE
;
16095 if (error_operand_p (decl
))
16098 /* Handle "__attribute__((cleanup))". We run the cleanup function
16099 before the destructor since the destructor is what actually
16100 terminates the lifetime of the object. */
16102 attr
= lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl
));
16111 /* Get the name specified by the user for the cleanup function. */
16112 id
= TREE_VALUE (TREE_VALUE (attr
));
16113 /* Look up the name to find the cleanup function to call. It is
16114 important to use lookup_name here because that is what is
16115 used in c-common.c:handle_cleanup_attribute when performing
16116 initial checks on the attribute. Note that those checks
16117 include ensuring that the function found is not an overloaded
16118 function, or an object with an overloaded call operator,
16119 etc.; we can rely on the fact that the function found is an
16120 ordinary FUNCTION_DECL. */
16121 fn
= lookup_name (id
);
16122 arg
= build_address (decl
);
16123 if (!mark_used (decl
, complain
) && !(complain
& tf_error
))
16124 return error_mark_node
;
16125 cleanup
= cp_build_function_call_nary (fn
, complain
, arg
, NULL_TREE
);
16126 if (cleanup
== error_mark_node
)
16127 return error_mark_node
;
16129 /* Handle ordinary C++ destructors. */
16130 type
= TREE_TYPE (decl
);
16131 if (type_build_dtor_call (type
))
16133 int flags
= LOOKUP_NORMAL
|LOOKUP_NONVIRTUAL
|LOOKUP_DESTRUCTOR
;
16137 if (TREE_CODE (type
) == ARRAY_TYPE
)
16140 addr
= build_address (decl
);
16142 call
= build_delete (TREE_TYPE (addr
), addr
,
16143 sfk_complete_destructor
, flags
, 0, complain
);
16144 if (call
== error_mark_node
)
16145 cleanup
= error_mark_node
;
16146 else if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type
))
16147 /* Discard the call. */;
16149 cleanup
= cp_build_compound_expr (cleanup
, call
, complain
);
16154 /* build_delete sets the location of the destructor call to the
16155 current location, even though the destructor is going to be
16156 called later, at the end of the current scope. This can lead to
16157 a "jumpy" behavior for users of debuggers when they step around
16158 the end of the block. So let's unset the location of the
16159 destructor call instead. */
16160 protected_set_expr_location (cleanup
, UNKNOWN_LOCATION
);
16164 && !lookup_attribute ("warn_unused", TYPE_ATTRIBUTES (TREE_TYPE (decl
)))
16165 /* Treat objects with destructors as used; the destructor may do
16166 something substantive. */
16167 && !mark_used (decl
, complain
) && !(complain
& tf_error
))
16168 return error_mark_node
;
16174 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
16175 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
16176 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
16179 static_fn_type (tree memfntype
)
16184 if (TYPE_PTRMEMFUNC_P (memfntype
))
16185 memfntype
= TYPE_PTRMEMFUNC_FN_TYPE (memfntype
);
16186 if (POINTER_TYPE_P (memfntype
)
16187 || TREE_CODE (memfntype
) == FUNCTION_DECL
)
16188 memfntype
= TREE_TYPE (memfntype
);
16189 if (TREE_CODE (memfntype
) == FUNCTION_TYPE
)
16191 gcc_assert (TREE_CODE (memfntype
) == METHOD_TYPE
);
16192 args
= TYPE_ARG_TYPES (memfntype
);
16193 cp_ref_qualifier rqual
= type_memfn_rqual (memfntype
);
16194 fntype
= build_function_type (TREE_TYPE (memfntype
), TREE_CHAIN (args
));
16195 fntype
= apply_memfn_quals (fntype
, type_memfn_quals (memfntype
), rqual
);
16196 fntype
= (cp_build_type_attribute_variant
16197 (fntype
, TYPE_ATTRIBUTES (memfntype
)));
16198 fntype
= (build_exception_variant
16199 (fntype
, TYPE_RAISES_EXCEPTIONS (memfntype
)));
16200 if (TYPE_HAS_LATE_RETURN_TYPE (memfntype
))
16201 TYPE_HAS_LATE_RETURN_TYPE (fntype
) = 1;
16205 /* DECL was originally constructed as a non-static member function,
16206 but turned out to be static. Update it accordingly. */
16209 revert_static_member_fn (tree decl
)
16211 tree stype
= static_fn_type (decl
);
16212 cp_cv_quals quals
= type_memfn_quals (stype
);
16213 cp_ref_qualifier rqual
= type_memfn_rqual (stype
);
16215 if (quals
!= TYPE_UNQUALIFIED
|| rqual
!= REF_QUAL_NONE
)
16216 stype
= apply_memfn_quals (stype
, TYPE_UNQUALIFIED
, REF_QUAL_NONE
);
16218 TREE_TYPE (decl
) = stype
;
16220 if (DECL_ARGUMENTS (decl
))
16221 DECL_ARGUMENTS (decl
) = DECL_CHAIN (DECL_ARGUMENTS (decl
));
16222 DECL_STATIC_FUNCTION_P (decl
) = 1;
16225 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
16226 one of the language-independent trees. */
16228 enum cp_tree_node_structure_enum
16229 cp_tree_node_structure (union lang_tree_node
* t
)
16231 switch (TREE_CODE (&t
->generic
))
16233 case DEFAULT_ARG
: return TS_CP_DEFAULT_ARG
;
16234 case DEFERRED_NOEXCEPT
: return TS_CP_DEFERRED_NOEXCEPT
;
16235 case IDENTIFIER_NODE
: return TS_CP_IDENTIFIER
;
16236 case OVERLOAD
: return TS_CP_OVERLOAD
;
16237 case TEMPLATE_PARM_INDEX
: return TS_CP_TPI
;
16238 case PTRMEM_CST
: return TS_CP_PTRMEM
;
16239 case BASELINK
: return TS_CP_BASELINK
;
16240 case TEMPLATE_DECL
: return TS_CP_TEMPLATE_DECL
;
16241 case STATIC_ASSERT
: return TS_CP_STATIC_ASSERT
;
16242 case ARGUMENT_PACK_SELECT
: return TS_CP_ARGUMENT_PACK_SELECT
;
16243 case TRAIT_EXPR
: return TS_CP_TRAIT_EXPR
;
16244 case LAMBDA_EXPR
: return TS_CP_LAMBDA_EXPR
;
16245 case TEMPLATE_INFO
: return TS_CP_TEMPLATE_INFO
;
16246 case CONSTRAINT_INFO
: return TS_CP_CONSTRAINT_INFO
;
16247 case USERDEF_LITERAL
: return TS_CP_USERDEF_LITERAL
;
16248 default: return TS_CP_GENERIC
;
16252 /* Build the void_list_node (void_type_node having been created). */
16254 build_void_list_node (void)
16256 tree t
= build_tree_list (NULL_TREE
, void_type_node
);
16261 cp_missing_noreturn_ok_p (tree decl
)
16263 /* A missing noreturn is ok for the `main' function. */
16264 return DECL_MAIN_P (decl
);
16267 /* Return the decl used to identify the COMDAT group into which DECL should
16271 cxx_comdat_group (tree decl
)
16273 /* Virtual tables, construction virtual tables, and virtual table
16274 tables all go in a single COMDAT group, named after the primary
16276 if (VAR_P (decl
) && DECL_VTABLE_OR_VTT_P (decl
))
16277 decl
= CLASSTYPE_VTABLES (DECL_CONTEXT (decl
));
16278 /* For all other DECLs, the COMDAT group is the mangled name of the
16279 declaration itself. */
16282 while (DECL_THUNK_P (decl
))
16284 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
16285 into the same section as the target function. In that case
16286 we must return target's name. */
16287 tree target
= THUNK_TARGET (decl
);
16288 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target
)
16289 && DECL_SECTION_NAME (target
) != NULL
16290 && DECL_ONE_ONLY (target
))
16300 /* Returns the return type for FN as written by the user, which may include
16301 a placeholder for a deduced return type. */
16304 fndecl_declared_return_type (tree fn
)
16306 fn
= STRIP_TEMPLATE (fn
);
16307 if (FNDECL_USED_AUTO (fn
))
16309 struct language_function
*f
= NULL
;
16310 if (DECL_STRUCT_FUNCTION (fn
))
16311 f
= DECL_STRUCT_FUNCTION (fn
)->language
;
16313 f
= DECL_SAVED_FUNCTION_DATA (fn
);
16314 return f
->x_auto_return_pattern
;
16316 return TREE_TYPE (TREE_TYPE (fn
));
16319 /* Returns true iff DECL is a variable or function declared with an auto type
16320 that has not yet been deduced to a real type. */
16323 undeduced_auto_decl (tree decl
)
16325 if (cxx_dialect
< cxx11
)
16327 return ((VAR_OR_FUNCTION_DECL_P (decl
)
16328 || TREE_CODE (decl
) == TEMPLATE_DECL
)
16329 && type_uses_auto (TREE_TYPE (decl
)));
16332 /* Complain if DECL has an undeduced return type. */
16335 require_deduced_type (tree decl
, tsubst_flags_t complain
)
16337 if (undeduced_auto_decl (decl
))
16339 if (complain
& tf_error
)
16340 error ("use of %qD before deduction of %<auto%>", decl
);
16346 #include "gt-cp-decl.h"