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 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1359 && lookup_attribute ("gnu_inline", \
1360 DECL_ATTRIBUTES (fn)))
1362 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1363 If the redeclaration is invalid, a diagnostic is issued, and the
1364 error_mark_node is returned. Otherwise, OLDDECL is returned.
1366 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1369 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1372 duplicate_decls (tree newdecl
, tree olddecl
, bool newdecl_is_friend
)
1374 unsigned olddecl_uid
= DECL_UID (olddecl
);
1375 int olddecl_friend
= 0, types_match
= 0, hidden_friend
= 0;
1376 int new_defines_function
= 0;
1377 tree new_template_info
;
1379 if (newdecl
== olddecl
)
1382 types_match
= decls_match (newdecl
, olddecl
);
1384 /* If either the type of the new decl or the type of the old decl is an
1385 error_mark_node, then that implies that we have already issued an
1386 error (earlier) for some bogus type specification, and in that case,
1387 it is rather pointless to harass the user with yet more error message
1388 about the same declaration, so just pretend the types match here. */
1389 if (TREE_TYPE (newdecl
) == error_mark_node
1390 || TREE_TYPE (olddecl
) == error_mark_node
)
1391 return error_mark_node
;
1393 if (UDLIT_OPER_P (DECL_NAME (newdecl
))
1394 && UDLIT_OPER_P (DECL_NAME (olddecl
)))
1396 if (TREE_CODE (newdecl
) == TEMPLATE_DECL
1397 && TREE_CODE (olddecl
) != TEMPLATE_DECL
1398 && check_raw_literal_operator (olddecl
))
1399 error ("literal operator template %q+D conflicts with"
1400 " raw literal operator %qD", newdecl
, olddecl
);
1401 else if (TREE_CODE (newdecl
) != TEMPLATE_DECL
1402 && TREE_CODE (olddecl
) == TEMPLATE_DECL
1403 && check_raw_literal_operator (newdecl
))
1404 error ("raw literal operator %q+D conflicts with"
1405 " literal operator template %qD", newdecl
, olddecl
);
1408 if (DECL_P (olddecl
)
1409 && TREE_CODE (newdecl
) == FUNCTION_DECL
1410 && TREE_CODE (olddecl
) == FUNCTION_DECL
1411 && diagnose_mismatched_attributes (olddecl
, newdecl
))
1413 if (DECL_INITIAL (olddecl
))
1414 inform (DECL_SOURCE_LOCATION (olddecl
),
1415 "previous definition of %qD was here", olddecl
);
1417 inform (DECL_SOURCE_LOCATION (olddecl
),
1418 "previous declaration of %qD was here", olddecl
);
1421 /* Check for redeclaration and other discrepancies. */
1422 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1423 && DECL_ARTIFICIAL (olddecl
))
1425 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl
));
1426 if (TREE_CODE (newdecl
) != FUNCTION_DECL
)
1428 /* Avoid warnings redeclaring built-ins which have not been
1429 explicitly declared. */
1430 if (DECL_ANTICIPATED (olddecl
))
1432 if (TREE_PUBLIC (newdecl
)
1433 && CP_DECL_CONTEXT (newdecl
) == global_namespace
)
1434 warning_at (DECL_SOURCE_LOCATION (newdecl
),
1435 OPT_Wbuiltin_declaration_mismatch
,
1436 "built-in function %qD declared as non-function",
1441 /* If you declare a built-in or predefined function name as static,
1442 the old definition is overridden, but optionally warn this was a
1443 bad choice of name. */
1444 if (! TREE_PUBLIC (newdecl
))
1446 warning (OPT_Wshadow
,
1447 DECL_BUILT_IN (olddecl
)
1448 ? G_("shadowing built-in function %q#D")
1449 : G_("shadowing library function %q#D"), olddecl
);
1450 /* Discard the old built-in function. */
1453 /* If the built-in is not ansi, then programs can override
1454 it even globally without an error. */
1455 else if (! DECL_BUILT_IN (olddecl
))
1456 warning_at (DECL_SOURCE_LOCATION (newdecl
), 0,
1457 "library function %q#D redeclared as non-function %q#D",
1460 error ("declaration of %q+#D conflicts with built-in "
1461 "declaration %q#D", newdecl
, olddecl
);
1464 else if (DECL_OMP_DECLARE_REDUCTION_P (olddecl
))
1466 gcc_assert (DECL_OMP_DECLARE_REDUCTION_P (newdecl
));
1467 error_at (DECL_SOURCE_LOCATION (newdecl
),
1468 "redeclaration of %<pragma omp declare reduction%>");
1469 inform (DECL_SOURCE_LOCATION (olddecl
),
1470 "previous %<pragma omp declare reduction%> declaration");
1471 return error_mark_node
;
1473 else if (!types_match
)
1475 /* Avoid warnings redeclaring built-ins which have not been
1476 explicitly declared. */
1477 if (DECL_ANTICIPATED (olddecl
))
1481 /* A new declaration doesn't match a built-in one unless it
1482 is also extern "C". */
1483 gcc_assert (DECL_IS_BUILTIN (olddecl
));
1484 gcc_assert (DECL_EXTERN_C_P (olddecl
));
1485 if (!DECL_EXTERN_C_P (newdecl
))
1488 for (t1
= TYPE_ARG_TYPES (TREE_TYPE (newdecl
)),
1489 t2
= TYPE_ARG_TYPES (TREE_TYPE (olddecl
));
1491 t1
= TREE_CHAIN (t1
), t2
= TREE_CHAIN (t2
))
1495 /* FILE, tm types are not known at the time
1496 we create the builtins. */
1497 for (unsigned i
= 0;
1498 i
< sizeof (builtin_structptr_types
)
1499 / sizeof (builtin_structptr_type
);
1501 if (TREE_VALUE (t2
) == builtin_structptr_types
[i
].node
)
1503 tree t
= TREE_VALUE (t1
);
1506 && TYPE_IDENTIFIER (TREE_TYPE (t
))
1507 == get_identifier (builtin_structptr_types
[i
].str
)
1508 && compparms (TREE_CHAIN (t1
), TREE_CHAIN (t2
)))
1510 tree oldargs
= TYPE_ARG_TYPES (TREE_TYPE (olddecl
));
1512 TYPE_ARG_TYPES (TREE_TYPE (olddecl
))
1513 = TYPE_ARG_TYPES (TREE_TYPE (newdecl
));
1514 types_match
= decls_match (newdecl
, olddecl
);
1516 return duplicate_decls (newdecl
, olddecl
,
1518 TYPE_ARG_TYPES (TREE_TYPE (olddecl
)) = oldargs
;
1523 if (! same_type_p (TREE_VALUE (t1
), TREE_VALUE (t2
)))
1528 warning_at (DECL_SOURCE_LOCATION (newdecl
),
1529 OPT_Wbuiltin_declaration_mismatch
,
1530 "declaration of %q#D conflicts with built-in "
1531 "declaration %q#D", newdecl
, olddecl
);
1533 else if ((DECL_EXTERN_C_P (newdecl
)
1534 && DECL_EXTERN_C_P (olddecl
))
1535 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl
)),
1536 TYPE_ARG_TYPES (TREE_TYPE (olddecl
))))
1538 /* A near match; override the builtin. */
1540 if (TREE_PUBLIC (newdecl
))
1541 warning_at (DECL_SOURCE_LOCATION (newdecl
),
1542 OPT_Wbuiltin_declaration_mismatch
,
1543 "new declaration %q#D ambiguates built-in "
1544 "declaration %q#D", newdecl
, olddecl
);
1546 warning (OPT_Wshadow
,
1547 DECL_BUILT_IN (olddecl
)
1548 ? G_("shadowing built-in function %q#D")
1549 : G_("shadowing library function %q#D"), olddecl
);
1552 /* Discard the old built-in function. */
1555 /* Replace the old RTL to avoid problems with inlining. */
1556 COPY_DECL_RTL (newdecl
, olddecl
);
1558 /* Even if the types match, prefer the new declarations type for
1559 built-ins which have not been explicitly declared, for
1560 exception lists, etc... */
1561 else if (DECL_IS_BUILTIN (olddecl
))
1563 tree type
= TREE_TYPE (newdecl
);
1564 tree attribs
= (*targetm
.merge_type_attributes
)
1565 (TREE_TYPE (olddecl
), type
);
1567 type
= cp_build_type_attribute_variant (type
, attribs
);
1568 TREE_TYPE (newdecl
) = TREE_TYPE (olddecl
) = type
;
1571 /* If a function is explicitly declared "throw ()", propagate that to
1572 the corresponding builtin. */
1573 if (DECL_BUILT_IN_CLASS (olddecl
) == BUILT_IN_NORMAL
1574 && DECL_ANTICIPATED (olddecl
)
1575 && TREE_NOTHROW (newdecl
)
1576 && !TREE_NOTHROW (olddecl
))
1578 enum built_in_function fncode
= DECL_FUNCTION_CODE (olddecl
);
1579 tree tmpdecl
= builtin_decl_explicit (fncode
);
1580 if (tmpdecl
&& tmpdecl
!= olddecl
&& types_match
)
1581 TREE_NOTHROW (tmpdecl
) = 1;
1584 /* Whether or not the builtin can throw exceptions has no
1585 bearing on this declarator. */
1586 TREE_NOTHROW (olddecl
) = 0;
1588 if (DECL_THIS_STATIC (newdecl
) && !DECL_THIS_STATIC (olddecl
))
1590 /* If a builtin function is redeclared as `static', merge
1591 the declarations, but make the original one static. */
1592 DECL_THIS_STATIC (olddecl
) = 1;
1593 TREE_PUBLIC (olddecl
) = 0;
1595 /* Make the old declaration consistent with the new one so
1596 that all remnants of the builtin-ness of this function
1597 will be banished. */
1598 SET_DECL_LANGUAGE (olddecl
, DECL_LANGUAGE (newdecl
));
1599 COPY_DECL_RTL (newdecl
, olddecl
);
1602 else if (TREE_CODE (olddecl
) != TREE_CODE (newdecl
))
1604 /* C++ Standard, 3.3, clause 4:
1605 "[Note: a namespace name or a class template name must be unique
1606 in its declarative region (7.3.2, clause 14). ]" */
1607 if (TREE_CODE (olddecl
) != NAMESPACE_DECL
1608 && TREE_CODE (newdecl
) != NAMESPACE_DECL
1609 && (TREE_CODE (olddecl
) != TEMPLATE_DECL
1610 || TREE_CODE (DECL_TEMPLATE_RESULT (olddecl
)) != TYPE_DECL
)
1611 && (TREE_CODE (newdecl
) != TEMPLATE_DECL
1612 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) != TYPE_DECL
))
1614 if ((TREE_CODE (olddecl
) == TYPE_DECL
&& DECL_ARTIFICIAL (olddecl
)
1615 && TREE_CODE (newdecl
) != TYPE_DECL
)
1616 || (TREE_CODE (newdecl
) == TYPE_DECL
&& DECL_ARTIFICIAL (newdecl
)
1617 && TREE_CODE (olddecl
) != TYPE_DECL
))
1619 /* We do nothing special here, because C++ does such nasty
1620 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1621 get shadowed, and know that if we need to find a TYPE_DECL
1622 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1623 slot of the identifier. */
1627 if ((TREE_CODE (newdecl
) == FUNCTION_DECL
1628 && DECL_FUNCTION_TEMPLATE_P (olddecl
))
1629 || (TREE_CODE (olddecl
) == FUNCTION_DECL
1630 && DECL_FUNCTION_TEMPLATE_P (newdecl
)))
1634 error ("%q#D redeclared as different kind of symbol", newdecl
);
1635 if (TREE_CODE (olddecl
) == TREE_LIST
)
1636 olddecl
= TREE_VALUE (olddecl
);
1637 inform (DECL_SOURCE_LOCATION (olddecl
),
1638 "previous declaration %q#D", olddecl
);
1640 return error_mark_node
;
1642 else if (!types_match
)
1644 if (CP_DECL_CONTEXT (newdecl
) != CP_DECL_CONTEXT (olddecl
))
1645 /* These are certainly not duplicate declarations; they're
1646 from different scopes. */
1649 if (TREE_CODE (newdecl
) == TEMPLATE_DECL
)
1651 /* The name of a class template may not be declared to refer to
1652 any other template, class, function, object, namespace, value,
1653 or type in the same scope. */
1654 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl
)) == TYPE_DECL
1655 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) == TYPE_DECL
)
1657 error ("conflicting declaration of template %q+#D", newdecl
);
1658 inform (DECL_SOURCE_LOCATION (olddecl
),
1659 "previous declaration %q#D", olddecl
);
1660 return error_mark_node
;
1662 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl
)) == FUNCTION_DECL
1663 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) == FUNCTION_DECL
1664 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl
))),
1665 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl
))))
1666 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl
),
1667 DECL_TEMPLATE_PARMS (olddecl
))
1668 /* Template functions can be disambiguated by
1670 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl
)),
1671 TREE_TYPE (TREE_TYPE (olddecl
)))
1672 // Template functions can also be disambiguated by
1674 && equivalently_constrained (olddecl
, newdecl
))
1676 error ("ambiguating new declaration %q+#D", newdecl
);
1677 inform (DECL_SOURCE_LOCATION (olddecl
),
1678 "old declaration %q#D", olddecl
);
1680 else if (check_concept_refinement (olddecl
, newdecl
))
1681 return error_mark_node
;
1684 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1686 if (DECL_EXTERN_C_P (newdecl
) && DECL_EXTERN_C_P (olddecl
))
1688 error ("conflicting declaration of C function %q+#D",
1690 inform (DECL_SOURCE_LOCATION (olddecl
),
1691 "previous declaration %q#D", olddecl
);
1694 /* For function versions, params and types match, but they
1695 are not ambiguous. */
1696 else if ((!DECL_FUNCTION_VERSIONED (newdecl
)
1697 && !DECL_FUNCTION_VERSIONED (olddecl
))
1698 // The functions have the same parameter types.
1699 && compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl
)),
1700 TYPE_ARG_TYPES (TREE_TYPE (olddecl
)))
1701 // And the same constraints.
1702 && equivalently_constrained (newdecl
, olddecl
))
1704 error ("ambiguating new declaration of %q+#D", newdecl
);
1705 inform (DECL_SOURCE_LOCATION (olddecl
),
1706 "old declaration %q#D", olddecl
);
1707 return error_mark_node
;
1714 error ("conflicting declaration %q+#D", newdecl
);
1715 inform (DECL_SOURCE_LOCATION (olddecl
),
1716 "previous declaration as %q#D", olddecl
);
1717 return error_mark_node
;
1720 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
1721 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl
)
1722 && (!DECL_TEMPLATE_INFO (newdecl
)
1723 || (DECL_TI_TEMPLATE (newdecl
)
1724 != DECL_TI_TEMPLATE (olddecl
))))
1725 || (DECL_TEMPLATE_SPECIALIZATION (newdecl
)
1726 && (!DECL_TEMPLATE_INFO (olddecl
)
1727 || (DECL_TI_TEMPLATE (olddecl
)
1728 != DECL_TI_TEMPLATE (newdecl
))))))
1729 /* It's OK to have a template specialization and a non-template
1730 with the same type, or to have specializations of two
1731 different templates with the same type. Note that if one is a
1732 specialization, and the other is an instantiation of the same
1733 template, that we do not exit at this point. That situation
1734 can occur if we instantiate a template class, and then
1735 specialize one of its methods. This situation is valid, but
1736 the declarations must be merged in the usual way. */
1738 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
1739 && ((DECL_TEMPLATE_INSTANTIATION (olddecl
)
1740 && !DECL_USE_TEMPLATE (newdecl
))
1741 || (DECL_TEMPLATE_INSTANTIATION (newdecl
)
1742 && !DECL_USE_TEMPLATE (olddecl
))))
1743 /* One of the declarations is a template instantiation, and the
1744 other is not a template at all. That's OK. */
1746 else if (TREE_CODE (newdecl
) == NAMESPACE_DECL
)
1748 /* In [namespace.alias] we have:
1750 In a declarative region, a namespace-alias-definition can be
1751 used to redefine a namespace-alias declared in that declarative
1752 region to refer only to the namespace to which it already
1755 Therefore, if we encounter a second alias directive for the same
1756 alias, we can just ignore the second directive. */
1757 if (DECL_NAMESPACE_ALIAS (newdecl
)
1758 && (DECL_NAMESPACE_ALIAS (newdecl
)
1759 == DECL_NAMESPACE_ALIAS (olddecl
)))
1762 /* Leave it to update_binding to merge or report error. */
1767 const char *errmsg
= redeclaration_error_message (newdecl
, olddecl
);
1770 error_at (DECL_SOURCE_LOCATION (newdecl
), errmsg
, newdecl
);
1771 if (DECL_NAME (olddecl
) != NULL_TREE
)
1772 inform (DECL_SOURCE_LOCATION (olddecl
),
1773 (DECL_INITIAL (olddecl
) && namespace_bindings_p ())
1774 ? G_("%q#D previously defined here")
1775 : G_("%q#D previously declared here"), olddecl
);
1776 return error_mark_node
;
1778 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1779 && DECL_INITIAL (olddecl
) != NULL_TREE
1780 && !prototype_p (TREE_TYPE (olddecl
))
1781 && prototype_p (TREE_TYPE (newdecl
)))
1783 /* Prototype decl follows defn w/o prototype. */
1784 if (warning_at (DECL_SOURCE_LOCATION (newdecl
), 0,
1785 "prototype specified for %q#D", newdecl
))
1786 inform (DECL_SOURCE_LOCATION (olddecl
),
1787 "previous non-prototype definition here");
1789 else if (VAR_OR_FUNCTION_DECL_P (olddecl
)
1790 && DECL_LANGUAGE (newdecl
) != DECL_LANGUAGE (olddecl
))
1793 If two declarations of the same function or object
1794 specify different linkage-specifications ..., the program
1795 is ill-formed.... Except for functions with C++ linkage,
1796 a function declaration without a linkage specification
1797 shall not precede the first linkage specification for
1798 that function. A function can be declared without a
1799 linkage specification after an explicit linkage
1800 specification has been seen; the linkage explicitly
1801 specified in the earlier declaration is not affected by
1802 such a function declaration.
1804 DR 563 raises the question why the restrictions on
1805 functions should not also apply to objects. Older
1806 versions of G++ silently ignore the linkage-specification
1814 which is clearly wrong. Therefore, we now treat objects
1816 if (current_lang_depth () == 0)
1818 /* There is no explicit linkage-specification, so we use
1819 the linkage from the previous declaration. */
1820 retrofit_lang_decl (newdecl
);
1821 SET_DECL_LANGUAGE (newdecl
, DECL_LANGUAGE (olddecl
));
1825 error ("conflicting declaration of %q+#D with %qL linkage",
1826 newdecl
, DECL_LANGUAGE (newdecl
));
1827 inform (DECL_SOURCE_LOCATION (olddecl
),
1828 "previous declaration with %qL linkage",
1829 DECL_LANGUAGE (olddecl
));
1833 if (DECL_LANG_SPECIFIC (olddecl
) && DECL_USE_TEMPLATE (olddecl
))
1835 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
1837 /* Note: free functions, as TEMPLATE_DECLs, are handled below. */
1838 if (DECL_FUNCTION_MEMBER_P (olddecl
)
1839 && (/* grokfndecl passes member function templates too
1840 as FUNCTION_DECLs. */
1841 DECL_TEMPLATE_INFO (olddecl
)
1843 Default arguments for a member function of a class
1844 template shall be specified on the initial declaration
1845 of the member function within the class template. */
1846 || CLASSTYPE_TEMPLATE_INFO (CP_DECL_CONTEXT (olddecl
))))
1847 check_redeclaration_no_default_args (newdecl
);
1850 tree t1
= FUNCTION_FIRST_USER_PARMTYPE (olddecl
);
1851 tree t2
= FUNCTION_FIRST_USER_PARMTYPE (newdecl
);
1854 for (; t1
&& t1
!= void_list_node
;
1855 t1
= TREE_CHAIN (t1
), t2
= TREE_CHAIN (t2
), i
++)
1856 if (TREE_PURPOSE (t1
) && TREE_PURPOSE (t2
))
1858 if (simple_cst_equal (TREE_PURPOSE (t1
),
1859 TREE_PURPOSE (t2
)) == 1)
1861 if (permerror (input_location
,
1862 "default argument given for parameter "
1863 "%d of %q#D", i
, newdecl
))
1864 inform (DECL_SOURCE_LOCATION (olddecl
),
1865 "previous specification in %q#D here",
1870 error ("default argument given for parameter %d "
1871 "of %q#D", i
, newdecl
);
1872 inform (DECL_SOURCE_LOCATION (olddecl
),
1873 "previous specification in %q#D here",
1881 /* Do not merge an implicit typedef with an explicit one. In:
1885 typedef class A A __attribute__ ((foo));
1887 the attribute should apply only to the typedef. */
1888 if (TREE_CODE (olddecl
) == TYPE_DECL
1889 && (DECL_IMPLICIT_TYPEDEF_P (olddecl
)
1890 || DECL_IMPLICIT_TYPEDEF_P (newdecl
)))
1893 /* If new decl is `static' and an `extern' was seen previously,
1895 warn_extern_redeclared_static (newdecl
, olddecl
);
1897 if (!validate_constexpr_redeclaration (olddecl
, newdecl
))
1898 return error_mark_node
;
1900 /* We have committed to returning 1 at this point. */
1901 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1903 /* Now that functions must hold information normally held
1904 by field decls, there is extra work to do so that
1905 declaration information does not get destroyed during
1907 if (DECL_VINDEX (olddecl
))
1908 DECL_VINDEX (newdecl
) = DECL_VINDEX (olddecl
);
1909 if (DECL_CONTEXT (olddecl
))
1910 DECL_CONTEXT (newdecl
) = DECL_CONTEXT (olddecl
);
1911 DECL_STATIC_CONSTRUCTOR (newdecl
) |= DECL_STATIC_CONSTRUCTOR (olddecl
);
1912 DECL_STATIC_DESTRUCTOR (newdecl
) |= DECL_STATIC_DESTRUCTOR (olddecl
);
1913 DECL_PURE_VIRTUAL_P (newdecl
) |= DECL_PURE_VIRTUAL_P (olddecl
);
1914 DECL_VIRTUAL_P (newdecl
) |= DECL_VIRTUAL_P (olddecl
);
1915 DECL_INVALID_OVERRIDER_P (newdecl
) |= DECL_INVALID_OVERRIDER_P (olddecl
);
1916 DECL_FINAL_P (newdecl
) |= DECL_FINAL_P (olddecl
);
1917 DECL_OVERRIDE_P (newdecl
) |= DECL_OVERRIDE_P (olddecl
);
1918 DECL_THIS_STATIC (newdecl
) |= DECL_THIS_STATIC (olddecl
);
1919 if (DECL_OVERLOADED_OPERATOR_P (olddecl
))
1920 DECL_OVERLOADED_OPERATOR_CODE_RAW (newdecl
)
1921 = DECL_OVERLOADED_OPERATOR_CODE_RAW (olddecl
);
1922 new_defines_function
= DECL_INITIAL (newdecl
) != NULL_TREE
;
1924 /* Optionally warn about more than one declaration for the same
1925 name, but don't warn about a function declaration followed by a
1927 if (warn_redundant_decls
&& ! DECL_ARTIFICIAL (olddecl
)
1928 && !(new_defines_function
&& DECL_INITIAL (olddecl
) == NULL_TREE
)
1929 /* Don't warn about extern decl followed by definition. */
1930 && !(DECL_EXTERNAL (olddecl
) && ! DECL_EXTERNAL (newdecl
))
1931 /* Don't warn about friends, let add_friend take care of it. */
1932 && ! (newdecl_is_friend
|| DECL_FRIEND_P (olddecl
))
1933 /* Don't warn about declaration followed by specialization. */
1934 && (! DECL_TEMPLATE_SPECIALIZATION (newdecl
)
1935 || DECL_TEMPLATE_SPECIALIZATION (olddecl
)))
1937 if (warning_at (DECL_SOURCE_LOCATION (newdecl
),
1938 OPT_Wredundant_decls
,
1939 "redundant redeclaration of %qD in same scope",
1941 inform (DECL_SOURCE_LOCATION (olddecl
),
1942 "previous declaration of %qD", olddecl
);
1945 if (!(DECL_TEMPLATE_INSTANTIATION (olddecl
)
1946 && DECL_TEMPLATE_SPECIALIZATION (newdecl
)))
1948 if (DECL_DELETED_FN (newdecl
))
1950 error ("deleted definition of %q+D", newdecl
);
1951 inform (DECL_SOURCE_LOCATION (olddecl
),
1952 "previous declaration of %qD", olddecl
);
1954 DECL_DELETED_FN (newdecl
) |= DECL_DELETED_FN (olddecl
);
1958 /* Deal with C++: must preserve virtual function table size. */
1959 if (TREE_CODE (olddecl
) == TYPE_DECL
)
1961 tree newtype
= TREE_TYPE (newdecl
);
1962 tree oldtype
= TREE_TYPE (olddecl
);
1964 if (newtype
!= error_mark_node
&& oldtype
!= error_mark_node
1965 && TYPE_LANG_SPECIFIC (newtype
) && TYPE_LANG_SPECIFIC (oldtype
))
1966 CLASSTYPE_FRIEND_CLASSES (newtype
)
1967 = CLASSTYPE_FRIEND_CLASSES (oldtype
);
1969 DECL_ORIGINAL_TYPE (newdecl
) = DECL_ORIGINAL_TYPE (olddecl
);
1972 /* Copy all the DECL_... slots specified in the new decl
1973 except for any that we copy here from the old type. */
1974 DECL_ATTRIBUTES (newdecl
)
1975 = (*targetm
.merge_decl_attributes
) (olddecl
, newdecl
);
1977 if (DECL_DECLARES_FUNCTION_P (olddecl
) && DECL_DECLARES_FUNCTION_P (newdecl
))
1979 olddecl_friend
= DECL_FRIEND_P (olddecl
);
1980 hidden_friend
= (DECL_ANTICIPATED (olddecl
)
1981 && DECL_HIDDEN_FRIEND_P (olddecl
)
1982 && newdecl_is_friend
);
1985 DECL_ANTICIPATED (olddecl
) = 0;
1986 DECL_HIDDEN_FRIEND_P (olddecl
) = 0;
1990 if (TREE_CODE (newdecl
) == TEMPLATE_DECL
)
1994 old_result
= DECL_TEMPLATE_RESULT (olddecl
);
1995 new_result
= DECL_TEMPLATE_RESULT (newdecl
);
1996 TREE_TYPE (olddecl
) = TREE_TYPE (old_result
);
1997 DECL_TEMPLATE_SPECIALIZATIONS (olddecl
)
1998 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl
),
1999 DECL_TEMPLATE_SPECIALIZATIONS (newdecl
));
2001 DECL_ATTRIBUTES (old_result
)
2002 = (*targetm
.merge_decl_attributes
) (old_result
, new_result
);
2004 if (DECL_FUNCTION_TEMPLATE_P (newdecl
))
2006 /* Per C++11 8.3.6/4, default arguments cannot be added in later
2007 declarations of a function template. */
2008 if (DECL_SOURCE_LOCATION (newdecl
)
2009 != DECL_SOURCE_LOCATION (olddecl
))
2010 check_redeclaration_no_default_args (newdecl
);
2012 check_default_args (newdecl
);
2014 if (GNU_INLINE_P (old_result
) != GNU_INLINE_P (new_result
)
2015 && DECL_INITIAL (new_result
))
2017 if (DECL_INITIAL (old_result
))
2018 DECL_UNINLINABLE (old_result
) = 1;
2020 DECL_UNINLINABLE (old_result
) = DECL_UNINLINABLE (new_result
);
2021 DECL_EXTERNAL (old_result
) = DECL_EXTERNAL (new_result
);
2022 DECL_NOT_REALLY_EXTERN (old_result
)
2023 = DECL_NOT_REALLY_EXTERN (new_result
);
2024 DECL_INTERFACE_KNOWN (old_result
)
2025 = DECL_INTERFACE_KNOWN (new_result
);
2026 DECL_DECLARED_INLINE_P (old_result
)
2027 = DECL_DECLARED_INLINE_P (new_result
);
2028 DECL_DISREGARD_INLINE_LIMITS (old_result
)
2029 |= DECL_DISREGARD_INLINE_LIMITS (new_result
);
2034 DECL_DECLARED_INLINE_P (old_result
)
2035 |= DECL_DECLARED_INLINE_P (new_result
);
2036 DECL_DISREGARD_INLINE_LIMITS (old_result
)
2037 |= DECL_DISREGARD_INLINE_LIMITS (new_result
);
2038 check_redeclaration_exception_specification (newdecl
, olddecl
);
2042 /* If the new declaration is a definition, update the file and
2043 line information on the declaration, and also make
2044 the old declaration the same definition. */
2045 if (DECL_INITIAL (new_result
) != NULL_TREE
)
2047 DECL_SOURCE_LOCATION (olddecl
)
2048 = DECL_SOURCE_LOCATION (old_result
)
2049 = DECL_SOURCE_LOCATION (newdecl
);
2050 DECL_INITIAL (old_result
) = DECL_INITIAL (new_result
);
2051 if (DECL_FUNCTION_TEMPLATE_P (newdecl
))
2054 DECL_ARGUMENTS (old_result
)
2055 = DECL_ARGUMENTS (new_result
);
2056 for (parm
= DECL_ARGUMENTS (old_result
); parm
;
2057 parm
= DECL_CHAIN (parm
))
2058 DECL_CONTEXT (parm
) = old_result
;
2067 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2068 check_redeclaration_exception_specification (newdecl
, olddecl
);
2070 /* Automatically handles default parameters. */
2071 tree oldtype
= TREE_TYPE (olddecl
);
2074 /* For typedefs use the old type, as the new type's DECL_NAME points
2075 at newdecl, which will be ggc_freed. */
2076 if (TREE_CODE (newdecl
) == TYPE_DECL
)
2078 /* But NEWTYPE might have an attribute, honor that. */
2079 tree tem
= TREE_TYPE (newdecl
);
2082 if (TYPE_USER_ALIGN (tem
))
2084 if (TYPE_ALIGN (tem
) > TYPE_ALIGN (newtype
))
2085 SET_TYPE_ALIGN (newtype
, TYPE_ALIGN (tem
));
2086 TYPE_USER_ALIGN (newtype
) = true;
2089 /* And remove the new type from the variants list. */
2090 if (TYPE_NAME (TREE_TYPE (newdecl
)) == newdecl
)
2092 tree remove
= TREE_TYPE (newdecl
);
2093 for (tree t
= TYPE_MAIN_VARIANT (remove
); ;
2094 t
= TYPE_NEXT_VARIANT (t
))
2095 if (TYPE_NEXT_VARIANT (t
) == remove
)
2097 TYPE_NEXT_VARIANT (t
) = TYPE_NEXT_VARIANT (remove
);
2103 /* Merge the data types specified in the two decls. */
2104 newtype
= merge_types (TREE_TYPE (newdecl
), TREE_TYPE (olddecl
));
2106 if (VAR_P (newdecl
))
2108 DECL_THIS_EXTERN (newdecl
) |= DECL_THIS_EXTERN (olddecl
);
2109 /* For already initialized vars, TREE_READONLY could have been
2110 cleared in cp_finish_decl, because the var needs runtime
2111 initialization or destruction. Make sure not to set
2112 TREE_READONLY on it again. */
2113 if (DECL_INITIALIZED_P (olddecl
)
2114 && !DECL_EXTERNAL (olddecl
)
2115 && !TREE_READONLY (olddecl
))
2116 TREE_READONLY (newdecl
) = 0;
2117 DECL_INITIALIZED_P (newdecl
) |= DECL_INITIALIZED_P (olddecl
);
2118 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl
)
2119 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl
);
2120 if (DECL_DEPENDENT_INIT_P (olddecl
))
2121 SET_DECL_DEPENDENT_INIT_P (newdecl
, true);
2122 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl
)
2123 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl
);
2124 if (DECL_CLASS_SCOPE_P (olddecl
))
2125 DECL_DECLARED_CONSTEXPR_P (newdecl
)
2126 |= DECL_DECLARED_CONSTEXPR_P (olddecl
);
2128 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
2129 if (DECL_LANG_SPECIFIC (olddecl
)
2130 && CP_DECL_THREADPRIVATE_P (olddecl
))
2132 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
2133 retrofit_lang_decl (newdecl
);
2134 CP_DECL_THREADPRIVATE_P (newdecl
) = 1;
2138 /* An explicit specialization of a function template or of a member
2139 function of a class template can be declared transaction_safe
2140 independently of whether the corresponding template entity is declared
2141 transaction_safe. */
2142 if (flag_tm
&& TREE_CODE (newdecl
) == FUNCTION_DECL
2143 && DECL_TEMPLATE_INSTANTIATION (olddecl
)
2144 && DECL_TEMPLATE_SPECIALIZATION (newdecl
)
2145 && tx_safe_fn_type_p (newtype
)
2146 && !tx_safe_fn_type_p (TREE_TYPE (newdecl
)))
2147 newtype
= tx_unsafe_fn_variant (newtype
);
2149 TREE_TYPE (newdecl
) = TREE_TYPE (olddecl
) = newtype
;
2151 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2152 check_default_args (newdecl
);
2154 /* Lay the type out, unless already done. */
2155 if (! same_type_p (newtype
, oldtype
)
2156 && TREE_TYPE (newdecl
) != error_mark_node
2157 && !(processing_template_decl
&& uses_template_parms (newdecl
)))
2158 layout_type (TREE_TYPE (newdecl
));
2160 if ((VAR_P (newdecl
)
2161 || TREE_CODE (newdecl
) == PARM_DECL
2162 || TREE_CODE (newdecl
) == RESULT_DECL
2163 || TREE_CODE (newdecl
) == FIELD_DECL
2164 || TREE_CODE (newdecl
) == TYPE_DECL
)
2165 && !(processing_template_decl
&& uses_template_parms (newdecl
)))
2166 layout_decl (newdecl
, 0);
2168 /* Merge the type qualifiers. */
2169 if (TREE_READONLY (newdecl
))
2170 TREE_READONLY (olddecl
) = 1;
2171 if (TREE_THIS_VOLATILE (newdecl
))
2172 TREE_THIS_VOLATILE (olddecl
) = 1;
2173 if (TREE_NOTHROW (newdecl
))
2174 TREE_NOTHROW (olddecl
) = 1;
2176 /* Merge deprecatedness. */
2177 if (TREE_DEPRECATED (newdecl
))
2178 TREE_DEPRECATED (olddecl
) = 1;
2180 /* Preserve function specific target and optimization options */
2181 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2183 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl
)
2184 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl
))
2185 DECL_FUNCTION_SPECIFIC_TARGET (newdecl
)
2186 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl
);
2188 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
)
2189 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
))
2190 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
)
2191 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
);
2194 /* Merge the initialization information. */
2195 if (DECL_INITIAL (newdecl
) == NULL_TREE
2196 && DECL_INITIAL (olddecl
) != NULL_TREE
)
2198 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
2199 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
2200 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2202 DECL_SAVED_TREE (newdecl
) = DECL_SAVED_TREE (olddecl
);
2203 DECL_STRUCT_FUNCTION (newdecl
) = DECL_STRUCT_FUNCTION (olddecl
);
2207 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2209 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl
)
2210 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl
);
2211 DECL_NO_LIMIT_STACK (newdecl
) |= DECL_NO_LIMIT_STACK (olddecl
);
2212 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
2213 TREE_NOTHROW (newdecl
) |= TREE_NOTHROW (olddecl
);
2214 DECL_IS_MALLOC (newdecl
) |= DECL_IS_MALLOC (olddecl
);
2215 DECL_IS_OPERATOR_NEW (newdecl
) |= DECL_IS_OPERATOR_NEW (olddecl
);
2216 DECL_PURE_P (newdecl
) |= DECL_PURE_P (olddecl
);
2217 TREE_READONLY (newdecl
) |= TREE_READONLY (olddecl
);
2218 DECL_LOOPING_CONST_OR_PURE_P (newdecl
)
2219 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl
);
2220 /* Keep the old RTL. */
2221 COPY_DECL_RTL (olddecl
, newdecl
);
2223 else if (VAR_P (newdecl
)
2224 && (DECL_SIZE (olddecl
) || !DECL_SIZE (newdecl
)))
2226 /* Keep the old RTL. We cannot keep the old RTL if the old
2227 declaration was for an incomplete object and the new
2228 declaration is not since many attributes of the RTL will
2230 COPY_DECL_RTL (olddecl
, newdecl
);
2233 /* If cannot merge, then use the new type and qualifiers,
2234 and don't preserve the old rtl. */
2237 /* Clean out any memory we had of the old declaration. */
2238 tree oldstatic
= value_member (olddecl
, static_aggregates
);
2240 TREE_VALUE (oldstatic
) = error_mark_node
;
2242 TREE_TYPE (olddecl
) = TREE_TYPE (newdecl
);
2243 TREE_READONLY (olddecl
) = TREE_READONLY (newdecl
);
2244 TREE_THIS_VOLATILE (olddecl
) = TREE_THIS_VOLATILE (newdecl
);
2245 TREE_NOTHROW (olddecl
) = TREE_NOTHROW (newdecl
);
2246 TREE_SIDE_EFFECTS (olddecl
) = TREE_SIDE_EFFECTS (newdecl
);
2249 /* Merge the storage class information. */
2250 merge_weak (newdecl
, olddecl
);
2252 DECL_DEFER_OUTPUT (newdecl
) |= DECL_DEFER_OUTPUT (olddecl
);
2253 TREE_PUBLIC (newdecl
) = TREE_PUBLIC (olddecl
);
2254 TREE_STATIC (olddecl
) = TREE_STATIC (newdecl
) |= TREE_STATIC (olddecl
);
2255 if (! DECL_EXTERNAL (olddecl
))
2256 DECL_EXTERNAL (newdecl
) = 0;
2257 if (! DECL_COMDAT (olddecl
))
2258 DECL_COMDAT (newdecl
) = 0;
2260 new_template_info
= NULL_TREE
;
2261 if (DECL_LANG_SPECIFIC (newdecl
) && DECL_LANG_SPECIFIC (olddecl
))
2263 bool new_redefines_gnu_inline
= false;
2265 if (new_defines_function
2266 && ((DECL_INTERFACE_KNOWN (olddecl
)
2267 && TREE_CODE (olddecl
) == FUNCTION_DECL
)
2268 || (TREE_CODE (olddecl
) == TEMPLATE_DECL
2269 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl
))
2270 == FUNCTION_DECL
))))
2274 if (TREE_CODE (fn
) == TEMPLATE_DECL
)
2275 fn
= DECL_TEMPLATE_RESULT (olddecl
);
2277 new_redefines_gnu_inline
= GNU_INLINE_P (fn
) && DECL_INITIAL (fn
);
2280 if (!new_redefines_gnu_inline
)
2282 DECL_INTERFACE_KNOWN (newdecl
) |= DECL_INTERFACE_KNOWN (olddecl
);
2283 DECL_NOT_REALLY_EXTERN (newdecl
) |= DECL_NOT_REALLY_EXTERN (olddecl
);
2284 DECL_COMDAT (newdecl
) |= DECL_COMDAT (olddecl
);
2286 DECL_TEMPLATE_INSTANTIATED (newdecl
)
2287 |= DECL_TEMPLATE_INSTANTIATED (olddecl
);
2288 DECL_ODR_USED (newdecl
) |= DECL_ODR_USED (olddecl
);
2290 /* If the OLDDECL is an instantiation and/or specialization,
2291 then the NEWDECL must be too. But, it may not yet be marked
2292 as such if the caller has created NEWDECL, but has not yet
2293 figured out that it is a redeclaration. */
2294 if (!DECL_USE_TEMPLATE (newdecl
))
2295 DECL_USE_TEMPLATE (newdecl
) = DECL_USE_TEMPLATE (olddecl
);
2297 /* Don't really know how much of the language-specific
2298 values we should copy from old to new. */
2299 DECL_IN_AGGR_P (newdecl
) = DECL_IN_AGGR_P (olddecl
);
2300 DECL_REPO_AVAILABLE_P (newdecl
) = DECL_REPO_AVAILABLE_P (olddecl
);
2301 DECL_INITIALIZED_IN_CLASS_P (newdecl
)
2302 |= DECL_INITIALIZED_IN_CLASS_P (olddecl
);
2304 if (LANG_DECL_HAS_MIN (newdecl
))
2306 DECL_LANG_SPECIFIC (newdecl
)->u
.min
.u2
=
2307 DECL_LANG_SPECIFIC (olddecl
)->u
.min
.u2
;
2308 if (DECL_TEMPLATE_INFO (newdecl
))
2310 new_template_info
= DECL_TEMPLATE_INFO (newdecl
);
2311 if (DECL_TEMPLATE_INSTANTIATION (olddecl
)
2312 && DECL_TEMPLATE_SPECIALIZATION (newdecl
))
2313 /* Remember the presence of explicit specialization args. */
2314 TINFO_USED_TEMPLATE_ID (DECL_TEMPLATE_INFO (olddecl
))
2315 = TINFO_USED_TEMPLATE_ID (new_template_info
);
2317 DECL_TEMPLATE_INFO (newdecl
) = DECL_TEMPLATE_INFO (olddecl
);
2319 /* Only functions have these fields. */
2320 if (DECL_DECLARES_FUNCTION_P (newdecl
))
2322 DECL_NONCONVERTING_P (newdecl
) = DECL_NONCONVERTING_P (olddecl
);
2323 DECL_BEFRIENDING_CLASSES (newdecl
)
2324 = chainon (DECL_BEFRIENDING_CLASSES (newdecl
),
2325 DECL_BEFRIENDING_CLASSES (olddecl
));
2326 /* DECL_THUNKS is only valid for virtual functions,
2327 otherwise it is a DECL_FRIEND_CONTEXT. */
2328 if (DECL_VIRTUAL_P (newdecl
))
2329 SET_DECL_THUNKS (newdecl
, DECL_THUNKS (olddecl
));
2331 /* Only variables have this field. */
2332 else if (VAR_P (newdecl
)
2333 && VAR_HAD_UNKNOWN_BOUND (olddecl
))
2334 SET_VAR_HAD_UNKNOWN_BOUND (newdecl
);
2337 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2341 /* Merge parameter attributes. */
2342 tree oldarg
, newarg
;
2343 for (oldarg
= DECL_ARGUMENTS(olddecl
),
2344 newarg
= DECL_ARGUMENTS(newdecl
);
2346 oldarg
= DECL_CHAIN(oldarg
), newarg
= DECL_CHAIN(newarg
)) {
2347 DECL_ATTRIBUTES (newarg
)
2348 = (*targetm
.merge_decl_attributes
) (oldarg
, newarg
);
2349 DECL_ATTRIBUTES (oldarg
) = DECL_ATTRIBUTES (newarg
);
2352 if (DECL_TEMPLATE_INSTANTIATION (olddecl
)
2353 && !DECL_TEMPLATE_INSTANTIATION (newdecl
))
2355 /* If newdecl is not a specialization, then it is not a
2356 template-related function at all. And that means that we
2357 should have exited above, returning 0. */
2358 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl
));
2360 if (DECL_ODR_USED (olddecl
))
2361 /* From [temp.expl.spec]:
2363 If a template, a member template or the member of a class
2364 template is explicitly specialized then that
2365 specialization shall be declared before the first use of
2366 that specialization that would cause an implicit
2367 instantiation to take place, in every translation unit in
2368 which such a use occurs. */
2369 error ("explicit specialization of %qD after first use",
2372 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl
);
2373 DECL_COMDAT (newdecl
) = (TREE_PUBLIC (newdecl
)
2374 && DECL_DECLARED_INLINE_P (newdecl
));
2376 /* Don't propagate visibility from the template to the
2377 specialization here. We'll do that in determine_visibility if
2379 DECL_VISIBILITY_SPECIFIED (olddecl
) = 0;
2381 /* [temp.expl.spec/14] We don't inline explicit specialization
2382 just because the primary template says so. */
2384 /* But still keep DECL_DISREGARD_INLINE_LIMITS in sync with
2385 the always_inline attribute. */
2386 if (DECL_DISREGARD_INLINE_LIMITS (olddecl
)
2387 && !DECL_DISREGARD_INLINE_LIMITS (newdecl
))
2389 if (DECL_DECLARED_INLINE_P (newdecl
))
2390 DECL_DISREGARD_INLINE_LIMITS (newdecl
) = true;
2392 DECL_ATTRIBUTES (newdecl
)
2393 = remove_attribute ("always_inline",
2394 DECL_ATTRIBUTES (newdecl
));
2397 else if (new_defines_function
&& DECL_INITIAL (olddecl
))
2399 /* Never inline re-defined extern inline functions.
2400 FIXME: this could be better handled by keeping both
2401 function as separate declarations. */
2402 DECL_UNINLINABLE (newdecl
) = 1;
2406 if (DECL_PENDING_INLINE_P (olddecl
))
2408 DECL_PENDING_INLINE_P (newdecl
) = 1;
2409 DECL_PENDING_INLINE_INFO (newdecl
)
2410 = DECL_PENDING_INLINE_INFO (olddecl
);
2412 else if (DECL_PENDING_INLINE_P (newdecl
))
2414 else if (DECL_SAVED_FUNCTION_DATA (newdecl
) == NULL
)
2415 DECL_SAVED_FUNCTION_DATA (newdecl
)
2416 = DECL_SAVED_FUNCTION_DATA (olddecl
);
2418 DECL_DECLARED_INLINE_P (newdecl
) |= DECL_DECLARED_INLINE_P (olddecl
);
2420 DECL_UNINLINABLE (newdecl
) = DECL_UNINLINABLE (olddecl
)
2421 = (DECL_UNINLINABLE (newdecl
) || DECL_UNINLINABLE (olddecl
));
2423 DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2424 = DECL_DISREGARD_INLINE_LIMITS (olddecl
)
2425 = (DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2426 || DECL_DISREGARD_INLINE_LIMITS (olddecl
));
2429 /* Preserve abstractness on cloned [cd]tors. */
2430 DECL_ABSTRACT_P (newdecl
) = DECL_ABSTRACT_P (olddecl
);
2432 /* Update newdecl's parms to point at olddecl. */
2433 for (parm
= DECL_ARGUMENTS (newdecl
); parm
;
2434 parm
= DECL_CHAIN (parm
))
2435 DECL_CONTEXT (parm
) = olddecl
;
2439 SET_DECL_LANGUAGE (olddecl
, DECL_LANGUAGE (newdecl
));
2440 COPY_DECL_ASSEMBLER_NAME (newdecl
, olddecl
);
2441 COPY_DECL_RTL (newdecl
, olddecl
);
2443 if (! types_match
|| new_defines_function
)
2445 /* These need to be copied so that the names are available.
2446 Note that if the types do match, we'll preserve inline
2447 info and other bits, but if not, we won't. */
2448 DECL_ARGUMENTS (olddecl
) = DECL_ARGUMENTS (newdecl
);
2449 DECL_RESULT (olddecl
) = DECL_RESULT (newdecl
);
2451 /* If redeclaring a builtin function, it stays built in
2452 if newdecl is a gnu_inline definition, or if newdecl is just
2454 if (DECL_BUILT_IN (olddecl
)
2455 && (new_defines_function
? GNU_INLINE_P (newdecl
) : types_match
))
2457 DECL_BUILT_IN_CLASS (newdecl
) = DECL_BUILT_IN_CLASS (olddecl
);
2458 DECL_FUNCTION_CODE (newdecl
) = DECL_FUNCTION_CODE (olddecl
);
2459 /* If we're keeping the built-in definition, keep the rtl,
2460 regardless of declaration matches. */
2461 COPY_DECL_RTL (olddecl
, newdecl
);
2462 if (DECL_BUILT_IN_CLASS (newdecl
) == BUILT_IN_NORMAL
)
2464 enum built_in_function fncode
= DECL_FUNCTION_CODE (newdecl
);
2467 /* If a compatible prototype of these builtin functions
2468 is seen, assume the runtime implements it with the
2469 expected semantics. */
2470 case BUILT_IN_STPCPY
:
2471 if (builtin_decl_explicit_p (fncode
))
2472 set_builtin_decl_implicit_p (fncode
, true);
2475 if (builtin_decl_explicit_p (fncode
))
2476 set_builtin_decl_declared_p (fncode
, true);
2481 copy_attributes_to_builtin (newdecl
);
2483 if (new_defines_function
)
2484 /* If defining a function declared with other language
2485 linkage, use the previously declared language linkage. */
2486 SET_DECL_LANGUAGE (newdecl
, DECL_LANGUAGE (olddecl
));
2487 else if (types_match
)
2489 DECL_RESULT (newdecl
) = DECL_RESULT (olddecl
);
2490 /* Don't clear out the arguments if we're just redeclaring a
2492 if (DECL_ARGUMENTS (olddecl
))
2493 DECL_ARGUMENTS (newdecl
) = DECL_ARGUMENTS (olddecl
);
2496 else if (TREE_CODE (newdecl
) == NAMESPACE_DECL
)
2497 NAMESPACE_LEVEL (newdecl
) = NAMESPACE_LEVEL (olddecl
);
2499 /* Now preserve various other info from the definition. */
2500 TREE_ADDRESSABLE (newdecl
) = TREE_ADDRESSABLE (olddecl
);
2501 TREE_ASM_WRITTEN (newdecl
) = TREE_ASM_WRITTEN (olddecl
);
2502 DECL_COMMON (newdecl
) = DECL_COMMON (olddecl
);
2503 COPY_DECL_ASSEMBLER_NAME (olddecl
, newdecl
);
2505 /* Warn about conflicting visibility specifications. */
2506 if (DECL_VISIBILITY_SPECIFIED (olddecl
)
2507 && DECL_VISIBILITY_SPECIFIED (newdecl
)
2508 && DECL_VISIBILITY (newdecl
) != DECL_VISIBILITY (olddecl
))
2510 if (warning_at (DECL_SOURCE_LOCATION (newdecl
), OPT_Wattributes
,
2511 "%qD: visibility attribute ignored because it "
2512 "conflicts with previous declaration", newdecl
))
2513 inform (DECL_SOURCE_LOCATION (olddecl
),
2514 "previous declaration of %qD", olddecl
);
2516 /* Choose the declaration which specified visibility. */
2517 if (DECL_VISIBILITY_SPECIFIED (olddecl
))
2519 DECL_VISIBILITY (newdecl
) = DECL_VISIBILITY (olddecl
);
2520 DECL_VISIBILITY_SPECIFIED (newdecl
) = 1;
2522 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2523 so keep this behavior. */
2524 if (VAR_P (newdecl
) && DECL_HAS_INIT_PRIORITY_P (newdecl
))
2526 SET_DECL_INIT_PRIORITY (olddecl
, DECL_INIT_PRIORITY (newdecl
));
2527 DECL_HAS_INIT_PRIORITY_P (olddecl
) = 1;
2529 /* Likewise for DECL_ALIGN, DECL_USER_ALIGN and DECL_PACKED. */
2530 if (DECL_ALIGN (olddecl
) > DECL_ALIGN (newdecl
))
2532 SET_DECL_ALIGN (newdecl
, DECL_ALIGN (olddecl
));
2533 DECL_USER_ALIGN (newdecl
) |= DECL_USER_ALIGN (olddecl
);
2535 DECL_USER_ALIGN (olddecl
) = DECL_USER_ALIGN (newdecl
);
2536 if (DECL_WARN_IF_NOT_ALIGN (olddecl
)
2537 > DECL_WARN_IF_NOT_ALIGN (newdecl
))
2538 SET_DECL_WARN_IF_NOT_ALIGN (newdecl
,
2539 DECL_WARN_IF_NOT_ALIGN (olddecl
));
2540 if (TREE_CODE (newdecl
) == FIELD_DECL
)
2541 DECL_PACKED (olddecl
) = DECL_PACKED (newdecl
);
2543 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2544 with that from NEWDECL below. */
2545 if (DECL_LANG_SPECIFIC (olddecl
))
2547 gcc_assert (DECL_LANG_SPECIFIC (olddecl
)
2548 != DECL_LANG_SPECIFIC (newdecl
));
2549 ggc_free (DECL_LANG_SPECIFIC (olddecl
));
2552 /* Merge the USED information. */
2553 if (TREE_USED (olddecl
))
2554 TREE_USED (newdecl
) = 1;
2555 else if (TREE_USED (newdecl
))
2556 TREE_USED (olddecl
) = 1;
2557 if (VAR_P (newdecl
))
2559 if (DECL_READ_P (olddecl
))
2560 DECL_READ_P (newdecl
) = 1;
2561 else if (DECL_READ_P (newdecl
))
2562 DECL_READ_P (olddecl
) = 1;
2564 if (DECL_PRESERVE_P (olddecl
))
2565 DECL_PRESERVE_P (newdecl
) = 1;
2566 else if (DECL_PRESERVE_P (newdecl
))
2567 DECL_PRESERVE_P (olddecl
) = 1;
2569 /* Merge the DECL_FUNCTION_VERSIONED information. newdecl will be copied
2570 to olddecl and deleted. */
2571 if (TREE_CODE (newdecl
) == FUNCTION_DECL
2572 && DECL_FUNCTION_VERSIONED (olddecl
))
2574 /* Set the flag for newdecl so that it gets copied to olddecl. */
2575 DECL_FUNCTION_VERSIONED (newdecl
) = 1;
2576 /* newdecl will be purged after copying to olddecl and is no longer
2578 cgraph_node::delete_function_version_by_decl (newdecl
);
2581 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2584 struct symtab_node
*snode
= symtab_node::get (olddecl
);
2586 function_size
= sizeof (struct tree_decl_common
);
2588 memcpy ((char *) olddecl
+ sizeof (struct tree_common
),
2589 (char *) newdecl
+ sizeof (struct tree_common
),
2590 function_size
- sizeof (struct tree_common
));
2592 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2593 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2594 sizeof (struct tree_function_decl
) - sizeof (struct tree_decl_common
));
2596 /* Preserve symtab node mapping. */
2597 olddecl
->decl_with_vis
.symtab_node
= snode
;
2599 if (new_template_info
)
2600 /* If newdecl is a template instantiation, it is possible that
2601 the following sequence of events has occurred:
2603 o A friend function was declared in a class template. The
2604 class template was instantiated.
2606 o The instantiation of the friend declaration was
2607 recorded on the instantiation list, and is newdecl.
2609 o Later, however, instantiate_class_template called pushdecl
2610 on the newdecl to perform name injection. But, pushdecl in
2611 turn called duplicate_decls when it discovered that another
2612 declaration of a global function with the same name already
2615 o Here, in duplicate_decls, we decided to clobber newdecl.
2617 If we're going to do that, we'd better make sure that
2618 olddecl, and not newdecl, is on the list of
2619 instantiations so that if we try to do the instantiation
2620 again we won't get the clobbered declaration. */
2621 reregister_specialization (newdecl
,
2627 size_t size
= tree_code_size (TREE_CODE (newdecl
));
2629 memcpy ((char *) olddecl
+ sizeof (struct tree_common
),
2630 (char *) newdecl
+ sizeof (struct tree_common
),
2631 sizeof (struct tree_decl_common
) - sizeof (struct tree_common
));
2632 switch (TREE_CODE (newdecl
))
2642 struct symtab_node
*snode
= NULL
;
2645 && (TREE_STATIC (olddecl
) || TREE_PUBLIC (olddecl
)
2646 || DECL_EXTERNAL (olddecl
)))
2647 snode
= symtab_node::get (olddecl
);
2648 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2649 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2650 size
- sizeof (struct tree_decl_common
)
2651 + TREE_CODE_LENGTH (TREE_CODE (newdecl
)) * sizeof (char *));
2652 if (VAR_P (newdecl
))
2653 olddecl
->decl_with_vis
.symtab_node
= snode
;
2657 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2658 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2659 sizeof (struct tree_decl_non_common
) - sizeof (struct tree_decl_common
)
2660 + TREE_CODE_LENGTH (TREE_CODE (newdecl
)) * sizeof (char *));
2665 if (VAR_OR_FUNCTION_DECL_P (newdecl
))
2667 if (DECL_EXTERNAL (olddecl
)
2668 || TREE_PUBLIC (olddecl
)
2669 || TREE_STATIC (olddecl
))
2671 /* Merge the section attribute.
2672 We want to issue an error if the sections conflict but that must be
2673 done later in decl_attributes since we are called before attributes
2675 if (DECL_SECTION_NAME (newdecl
) != NULL
)
2676 set_decl_section_name (olddecl
, DECL_SECTION_NAME (newdecl
));
2678 if (DECL_ONE_ONLY (newdecl
))
2680 struct symtab_node
*oldsym
, *newsym
;
2681 if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
2682 oldsym
= cgraph_node::get_create (olddecl
);
2684 oldsym
= varpool_node::get_create (olddecl
);
2685 newsym
= symtab_node::get (newdecl
);
2686 oldsym
->set_comdat_group (newsym
->get_comdat_group ());
2691 && CP_DECL_THREAD_LOCAL_P (newdecl
))
2693 CP_DECL_THREAD_LOCAL_P (olddecl
) = true;
2694 if (!processing_template_decl
)
2695 set_decl_tls_model (olddecl
, DECL_TLS_MODEL (newdecl
));
2699 DECL_UID (olddecl
) = olddecl_uid
;
2701 DECL_FRIEND_P (olddecl
) = 1;
2704 DECL_ANTICIPATED (olddecl
) = 1;
2705 DECL_HIDDEN_FRIEND_P (olddecl
) = 1;
2708 /* NEWDECL contains the merged attribute lists.
2709 Update OLDDECL to be the same. */
2710 DECL_ATTRIBUTES (olddecl
) = DECL_ATTRIBUTES (newdecl
);
2712 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2713 so that encode_section_info has a chance to look at the new decl
2714 flags and attributes. */
2715 if (DECL_RTL_SET_P (olddecl
)
2716 && (TREE_CODE (olddecl
) == FUNCTION_DECL
2718 && TREE_STATIC (olddecl
))))
2719 make_decl_rtl (olddecl
);
2721 /* The NEWDECL will no longer be needed. Because every out-of-class
2722 declaration of a member results in a call to duplicate_decls,
2723 freeing these nodes represents in a significant savings.
2725 Before releasing the node, be sore to remove function from symbol
2726 table that might have been inserted there to record comdat group.
2727 Be sure to however do not free DECL_STRUCT_FUNCTION because this
2728 structure is shared in between newdecl and oldecl. */
2729 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2730 DECL_STRUCT_FUNCTION (newdecl
) = NULL
;
2731 if (VAR_OR_FUNCTION_DECL_P (newdecl
))
2733 struct symtab_node
*snode
= symtab_node::get (newdecl
);
2738 /* Remove the associated constraints for newdecl, if any, before
2739 reclaiming memory. */
2741 remove_constraints (newdecl
);
2748 /* Return zero if the declaration NEWDECL is valid
2749 when the declaration OLDDECL (assumed to be for the same name)
2750 has already been seen.
2751 Otherwise return an error message format string with a %s
2752 where the identifier should go. */
2755 redeclaration_error_message (tree newdecl
, tree olddecl
)
2757 if (TREE_CODE (newdecl
) == TYPE_DECL
)
2759 /* Because C++ can put things into name space for free,
2760 constructs like "typedef struct foo { ... } foo"
2761 would look like an erroneous redeclaration. */
2762 if (same_type_p (TREE_TYPE (newdecl
), TREE_TYPE (olddecl
)))
2765 return G_("redefinition of %q#D");
2767 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2769 /* If this is a pure function, its olddecl will actually be
2770 the original initialization to `0' (which we force to call
2771 abort()). Don't complain about redefinition in this case. */
2772 if (DECL_LANG_SPECIFIC (olddecl
) && DECL_PURE_VIRTUAL_P (olddecl
)
2773 && DECL_INITIAL (olddecl
) == NULL_TREE
)
2776 /* If both functions come from different namespaces, this is not
2777 a redeclaration - this is a conflict with a used function. */
2778 if (DECL_NAMESPACE_SCOPE_P (olddecl
)
2779 && DECL_CONTEXT (olddecl
) != DECL_CONTEXT (newdecl
)
2780 && ! decls_match (olddecl
, newdecl
))
2781 return G_("%qD conflicts with used function");
2783 /* We'll complain about linkage mismatches in
2784 warn_extern_redeclared_static. */
2786 /* Defining the same name twice is no good. */
2787 if (decl_defined_p (olddecl
)
2788 && decl_defined_p (newdecl
))
2790 if (DECL_NAME (olddecl
) == NULL_TREE
)
2791 return G_("%q#D not declared in class");
2792 else if (!GNU_INLINE_P (olddecl
)
2793 || GNU_INLINE_P (newdecl
))
2794 return G_("redefinition of %q#D");
2797 if (DECL_DECLARED_INLINE_P (olddecl
) && DECL_DECLARED_INLINE_P (newdecl
))
2799 bool olda
= GNU_INLINE_P (olddecl
);
2800 bool newa
= GNU_INLINE_P (newdecl
);
2805 return G_("%q+D redeclared inline with "
2806 "%<gnu_inline%> attribute");
2808 return G_("%q+D redeclared inline without "
2809 "%<gnu_inline%> attribute");
2813 check_abi_tag_redeclaration
2814 (olddecl
, lookup_attribute ("abi_tag", DECL_ATTRIBUTES (olddecl
)),
2815 lookup_attribute ("abi_tag", DECL_ATTRIBUTES (newdecl
)));
2819 else if (TREE_CODE (newdecl
) == TEMPLATE_DECL
)
2823 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) == TYPE_DECL
)
2825 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl
))
2826 && COMPLETE_TYPE_P (TREE_TYPE (olddecl
)))
2827 return G_("redefinition of %q#D");
2831 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) != FUNCTION_DECL
2832 || (DECL_TEMPLATE_RESULT (newdecl
)
2833 == DECL_TEMPLATE_RESULT (olddecl
)))
2836 nt
= DECL_TEMPLATE_RESULT (newdecl
);
2837 if (DECL_TEMPLATE_INFO (nt
))
2838 nt
= DECL_TEMPLATE_RESULT (template_for_substitution (nt
));
2839 ot
= DECL_TEMPLATE_RESULT (olddecl
);
2840 if (DECL_TEMPLATE_INFO (ot
))
2841 ot
= DECL_TEMPLATE_RESULT (template_for_substitution (ot
));
2842 if (DECL_INITIAL (nt
) && DECL_INITIAL (ot
)
2843 && (!GNU_INLINE_P (ot
) || GNU_INLINE_P (nt
)))
2844 return G_("redefinition of %q#D");
2846 if (DECL_DECLARED_INLINE_P (ot
) && DECL_DECLARED_INLINE_P (nt
))
2848 bool olda
= GNU_INLINE_P (ot
);
2849 bool newa
= GNU_INLINE_P (nt
);
2854 return G_("%q+D redeclared inline with "
2855 "%<gnu_inline%> attribute");
2857 return G_("%q+D redeclared inline without "
2858 "%<gnu_inline%> attribute");
2862 /* Core issue #226 (C++0x):
2864 If a friend function template declaration specifies a
2865 default template-argument, that declaration shall be a
2866 definition and shall be the only declaration of the
2867 function template in the translation unit. */
2868 if ((cxx_dialect
!= cxx98
)
2869 && TREE_CODE (ot
) == FUNCTION_DECL
&& DECL_FRIEND_P (ot
)
2870 && !check_default_tmpl_args (nt
, DECL_TEMPLATE_PARMS (newdecl
),
2871 /*is_primary=*/true,
2872 /*is_partial=*/false,
2873 /*is_friend_decl=*/2))
2874 return G_("redeclaration of friend %q#D "
2875 "may not have default template arguments");
2879 else if (VAR_P (newdecl
)
2880 && CP_DECL_THREAD_LOCAL_P (newdecl
) != CP_DECL_THREAD_LOCAL_P (olddecl
)
2881 && (! DECL_LANG_SPECIFIC (olddecl
)
2882 || ! CP_DECL_THREADPRIVATE_P (olddecl
)
2883 || CP_DECL_THREAD_LOCAL_P (newdecl
)))
2885 /* Only variables can be thread-local, and all declarations must
2886 agree on this property. */
2887 if (CP_DECL_THREAD_LOCAL_P (newdecl
))
2888 return G_("thread-local declaration of %q#D follows "
2889 "non-thread-local declaration");
2891 return G_("non-thread-local declaration of %q#D follows "
2892 "thread-local declaration");
2894 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl
))
2896 /* The objects have been declared at namespace scope. If either
2897 is a member of an anonymous union, then this is an invalid
2898 redeclaration. For example:
2904 if ((VAR_P (newdecl
) && DECL_ANON_UNION_VAR_P (newdecl
))
2905 || (VAR_P (olddecl
) && DECL_ANON_UNION_VAR_P (olddecl
)))
2906 return G_("redeclaration of %q#D");
2907 /* If at least one declaration is a reference, there is no
2908 conflict. For example:
2914 if (DECL_EXTERNAL (newdecl
) || DECL_EXTERNAL (olddecl
))
2917 /* Static data member declared outside a class definition
2918 if the variable is defined within the class with constexpr
2919 specifier is declaration rather than definition (and
2921 if (cxx_dialect
>= cxx17
2922 && DECL_CLASS_SCOPE_P (olddecl
)
2923 && DECL_DECLARED_CONSTEXPR_P (olddecl
)
2924 && !DECL_INITIAL (newdecl
))
2926 DECL_EXTERNAL (newdecl
) = 1;
2927 /* For now, only warn with explicit -Wdeprecated. */
2928 if (global_options_set
.x_warn_deprecated
2929 && warning_at (DECL_SOURCE_LOCATION (newdecl
), OPT_Wdeprecated
,
2930 "redundant redeclaration of %<constexpr%> static "
2931 "data member %qD", newdecl
))
2932 inform (DECL_SOURCE_LOCATION (olddecl
),
2933 "previous declaration of %qD", olddecl
);
2937 /* Reject two definitions. */
2938 return G_("redefinition of %q#D");
2942 /* Objects declared with block scope: */
2943 /* Reject two definitions, and reject a definition
2944 together with an external reference. */
2945 if (!(DECL_EXTERNAL (newdecl
) && DECL_EXTERNAL (olddecl
)))
2946 return G_("redeclaration of %q#D");
2952 /* Hash and equality functions for the named_label table. */
2955 named_label_hash::hash (const value_type entry
)
2957 return IDENTIFIER_HASH_VALUE (entry
->name
);
2961 named_label_hash::equal (const value_type entry
, compare_type name
)
2963 return name
== entry
->name
;
2966 /* Look for a label named ID in the current function. If one cannot
2967 be found, create one. Return the named_label_entry, or NULL on
2970 static named_label_entry
*
2971 lookup_label_1 (tree id
, bool making_local_p
)
2973 /* You can't use labels at global scope. */
2974 if (current_function_decl
== NULL_TREE
)
2976 error ("label %qE referenced outside of any function", id
);
2981 named_labels
= hash_table
<named_label_hash
>::create_ggc (13);
2983 hashval_t hash
= IDENTIFIER_HASH_VALUE (id
);
2984 named_label_entry
**slot
2985 = named_labels
->find_slot_with_hash (id
, hash
, INSERT
);
2986 named_label_entry
*old
= *slot
;
2988 if (old
&& old
->label_decl
)
2990 if (!making_local_p
)
2993 if (old
->binding_level
== current_binding_level
)
2995 error ("local label %qE conflicts with existing label", id
);
2996 inform (DECL_SOURCE_LOCATION (old
->label_decl
), "previous label");
3001 /* We are making a new decl, create or reuse the named_label_entry */
3002 named_label_entry
*ent
= NULL
;
3003 if (old
&& !old
->label_decl
)
3007 ent
= ggc_cleared_alloc
<named_label_entry
> ();
3013 /* Now create the LABEL_DECL. */
3014 tree decl
= build_decl (input_location
, LABEL_DECL
, id
, void_type_node
);
3016 DECL_CONTEXT (decl
) = current_function_decl
;
3017 SET_DECL_MODE (decl
, VOIDmode
);
3020 C_DECLARED_LABEL_FLAG (decl
) = true;
3021 DECL_CHAIN (decl
) = current_binding_level
->names
;
3022 current_binding_level
->names
= decl
;
3025 ent
->label_decl
= decl
;
3030 /* Wrapper for lookup_label_1. */
3033 lookup_label (tree id
)
3035 bool subtime
= timevar_cond_start (TV_NAME_LOOKUP
);
3036 named_label_entry
*ent
= lookup_label_1 (id
, false);
3037 timevar_cond_stop (TV_NAME_LOOKUP
, subtime
);
3038 return ent
? ent
->label_decl
: NULL_TREE
;
3042 declare_local_label (tree id
)
3044 bool subtime
= timevar_cond_start (TV_NAME_LOOKUP
);
3045 named_label_entry
*ent
= lookup_label_1 (id
, true);
3046 timevar_cond_stop (TV_NAME_LOOKUP
, subtime
);
3047 return ent
? ent
->label_decl
: NULL_TREE
;
3050 /* Returns nonzero if it is ill-formed to jump past the declaration of
3051 DECL. Returns 2 if it's also a real problem. */
3054 decl_jump_unsafe (tree decl
)
3056 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
3057 with automatic storage duration is not in scope to a point where it is
3058 in scope is ill-formed unless the variable has scalar type, class type
3059 with a trivial default constructor and a trivial destructor, a
3060 cv-qualified version of one of these types, or an array of one of the
3061 preceding types and is declared without an initializer (8.5). */
3062 tree type
= TREE_TYPE (decl
);
3064 if (!VAR_P (decl
) || TREE_STATIC (decl
)
3065 || type
== error_mark_node
)
3068 if (DECL_NONTRIVIALLY_INITIALIZED_P (decl
)
3069 || variably_modified_type_p (type
, NULL_TREE
))
3072 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
))
3078 /* A subroutine of check_previous_goto_1 and check_goto to identify a branch
3082 identify_goto (tree decl
, location_t loc
, const location_t
*locus
,
3083 diagnostic_t diag_kind
)
3086 = emit_diagnostic (diag_kind
, loc
, 0,
3087 decl
? N_("jump to label %qD")
3088 : N_("jump to case label"), decl
);
3089 if (complained
&& locus
)
3090 inform (*locus
, " from here");
3094 /* Check that a single previously seen jump to a newly defined label
3095 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
3096 the jump context; NAMES are the names in scope in LEVEL at the jump
3097 context; LOCUS is the source position of the jump or 0. Returns
3098 true if all is well. */
3101 check_previous_goto_1 (tree decl
, cp_binding_level
* level
, tree names
,
3102 bool exited_omp
, const location_t
*locus
)
3104 cp_binding_level
*b
;
3105 bool complained
= false;
3107 bool saw_eh
= false, saw_omp
= false, saw_tm
= false, saw_cxif
= false;
3111 complained
= identify_goto (decl
, input_location
, locus
, DK_ERROR
);
3113 inform (input_location
, " exits OpenMP structured block");
3118 for (b
= current_binding_level
; b
; b
= b
->level_chain
)
3120 tree new_decls
, old_decls
= (b
== level
? names
: NULL_TREE
);
3122 for (new_decls
= b
->names
; new_decls
!= old_decls
;
3123 new_decls
= (DECL_P (new_decls
) ? DECL_CHAIN (new_decls
)
3124 : TREE_CHAIN (new_decls
)))
3126 int problem
= decl_jump_unsafe (new_decls
);
3132 complained
= identify_goto (decl
, input_location
, locus
,
3139 inform (DECL_SOURCE_LOCATION (new_decls
),
3140 " crosses initialization of %q#D", new_decls
);
3142 inform (DECL_SOURCE_LOCATION (new_decls
),
3143 " enters scope of %q#D, which has "
3144 "non-trivial destructor", new_decls
);
3151 const char *inf
= NULL
;
3152 location_t loc
= input_location
;
3157 inf
= N_("enters try block");
3163 inf
= N_("enters catch block");
3169 inf
= N_("enters OpenMP structured block");
3173 case sk_transaction
:
3175 inf
= N_("enters synchronized or atomic statement");
3180 if (!saw_cxif
&& level_for_constexpr_if (b
->level_chain
))
3182 inf
= N_("enters constexpr if statement");
3183 loc
= EXPR_LOCATION (b
->level_chain
->this_entity
);
3195 complained
= identify_goto (decl
, input_location
, locus
, DK_ERROR
);
3198 inform (loc
, " %s", inf
);
3206 check_previous_goto (tree decl
, struct named_label_use_entry
*use
)
3208 check_previous_goto_1 (decl
, use
->binding_level
,
3209 use
->names_in_scope
, use
->in_omp_scope
,
3210 &use
->o_goto_locus
);
3214 check_switch_goto (cp_binding_level
* level
)
3216 return check_previous_goto_1 (NULL_TREE
, level
, level
->names
, false, NULL
);
3219 /* Check that a new jump to a label DECL is OK. Called by
3220 finish_goto_stmt. */
3223 check_goto (tree decl
)
3225 /* We can't know where a computed goto is jumping.
3226 So we assume that it's OK. */
3227 if (TREE_CODE (decl
) != LABEL_DECL
)
3230 /* We didn't record any information about this label when we created it,
3231 and there's not much point since it's trivial to analyze as a return. */
3232 if (decl
== cdtor_label
)
3235 hashval_t hash
= IDENTIFIER_HASH_VALUE (DECL_NAME (decl
));
3236 named_label_entry
**slot
3237 = named_labels
->find_slot_with_hash (DECL_NAME (decl
), hash
, NO_INSERT
);
3238 named_label_entry
*ent
= *slot
;
3240 /* If the label hasn't been defined yet, defer checking. */
3241 if (! DECL_INITIAL (decl
))
3243 /* Don't bother creating another use if the last goto had the
3244 same data, and will therefore create the same set of errors. */
3246 && ent
->uses
->names_in_scope
== current_binding_level
->names
)
3249 named_label_use_entry
*new_use
3250 = ggc_alloc
<named_label_use_entry
> ();
3251 new_use
->binding_level
= current_binding_level
;
3252 new_use
->names_in_scope
= current_binding_level
->names
;
3253 new_use
->o_goto_locus
= input_location
;
3254 new_use
->in_omp_scope
= false;
3256 new_use
->next
= ent
->uses
;
3257 ent
->uses
= new_use
;
3261 bool saw_catch
= false, complained
= false;
3266 if (ent
->in_try_scope
|| ent
->in_catch_scope
|| ent
->in_transaction_scope
3267 || ent
->in_constexpr_if
3268 || ent
->in_omp_scope
|| !vec_safe_is_empty (ent
->bad_decls
))
3270 diagnostic_t diag_kind
= DK_PERMERROR
;
3271 if (ent
->in_try_scope
|| ent
->in_catch_scope
|| ent
->in_constexpr_if
3272 || ent
->in_transaction_scope
|| ent
->in_omp_scope
)
3273 diag_kind
= DK_ERROR
;
3274 complained
= identify_goto (decl
, DECL_SOURCE_LOCATION (decl
),
3275 &input_location
, diag_kind
);
3276 identified
= 1 + (diag_kind
== DK_ERROR
);
3279 FOR_EACH_VEC_SAFE_ELT (ent
->bad_decls
, ix
, bad
)
3281 int u
= decl_jump_unsafe (bad
);
3283 if (u
> 1 && DECL_ARTIFICIAL (bad
))
3285 /* Can't skip init of __exception_info. */
3286 if (identified
== 1)
3288 complained
= identify_goto (decl
, DECL_SOURCE_LOCATION (decl
),
3289 &input_location
, DK_ERROR
);
3293 inform (DECL_SOURCE_LOCATION (bad
), " enters catch block");
3296 else if (complained
)
3299 inform (DECL_SOURCE_LOCATION (bad
),
3300 " skips initialization of %q#D", bad
);
3302 inform (DECL_SOURCE_LOCATION (bad
),
3303 " enters scope of %q#D which has "
3304 "non-trivial destructor", bad
);
3310 if (ent
->in_try_scope
)
3311 inform (input_location
, " enters try block");
3312 else if (ent
->in_catch_scope
&& !saw_catch
)
3313 inform (input_location
, " enters catch block");
3314 else if (ent
->in_transaction_scope
)
3315 inform (input_location
, " enters synchronized or atomic statement");
3316 else if (ent
->in_constexpr_if
)
3317 inform (input_location
, " enters %<constexpr%> if statement");
3320 if (ent
->in_omp_scope
)
3323 inform (input_location
, " enters OpenMP structured block");
3325 else if (flag_openmp
)
3326 for (cp_binding_level
*b
= current_binding_level
; b
; b
= b
->level_chain
)
3328 if (b
== ent
->binding_level
)
3330 if (b
->kind
== sk_omp
)
3334 complained
= identify_goto (decl
,
3335 DECL_SOURCE_LOCATION (decl
),
3336 &input_location
, DK_ERROR
);
3340 inform (input_location
, " exits OpenMP structured block");
3346 /* Check that a return is ok wrt OpenMP structured blocks.
3347 Called by finish_return_stmt. Returns true if all is well. */
3350 check_omp_return (void)
3352 for (cp_binding_level
*b
= current_binding_level
; b
; b
= b
->level_chain
)
3353 if (b
->kind
== sk_omp
)
3355 error ("invalid exit from OpenMP structured block");
3358 else if (b
->kind
== sk_function_parms
)
3363 /* Define a label, specifying the location in the source file.
3364 Return the LABEL_DECL node for the label. */
3367 define_label_1 (location_t location
, tree name
)
3369 /* After labels, make any new cleanups in the function go into their
3370 own new (temporary) binding contour. */
3371 for (cp_binding_level
*p
= current_binding_level
;
3372 p
->kind
!= sk_function_parms
;
3374 p
->more_cleanups_ok
= 0;
3376 named_label_entry
*ent
= lookup_label_1 (name
, false);
3377 tree decl
= ent
->label_decl
;
3379 if (DECL_INITIAL (decl
) != NULL_TREE
)
3381 error ("duplicate label %qD", decl
);
3382 return error_mark_node
;
3386 /* Mark label as having been defined. */
3387 DECL_INITIAL (decl
) = error_mark_node
;
3388 /* Say where in the source. */
3389 DECL_SOURCE_LOCATION (decl
) = location
;
3391 ent
->binding_level
= current_binding_level
;
3392 ent
->names_in_scope
= current_binding_level
->names
;
3394 for (named_label_use_entry
*use
= ent
->uses
; use
; use
= use
->next
)
3395 check_previous_goto (decl
, use
);
3402 /* Wrapper for define_label_1. */
3405 define_label (location_t location
, tree name
)
3407 bool running
= timevar_cond_start (TV_NAME_LOOKUP
);
3408 tree ret
= define_label_1 (location
, name
);
3409 timevar_cond_stop (TV_NAME_LOOKUP
, running
);
3416 cp_binding_level
*level
;
3417 struct cp_switch
*next
;
3418 /* The SWITCH_STMT being built. */
3420 /* A splay-tree mapping the low element of a case range to the high
3421 element, or NULL_TREE if there is no high element. Used to
3422 determine whether or not a new case label duplicates an old case
3423 label. We need a tree, rather than simply a hash table, because
3424 of the GNU case range extension. */
3426 /* Remember whether there was a case value that is outside the
3427 range of the original type of the controlling expression. */
3428 bool outside_range_p
;
3429 /* Remember whether a default: case label has been seen. */
3431 /* Remember whether a BREAK_STMT has been seen in this SWITCH_STMT. */
3432 bool break_stmt_seen_p
;
3433 /* Set if inside of {FOR,DO,WHILE}_BODY nested inside of a switch,
3434 where BREAK_STMT doesn't belong to the SWITCH_STMT. */
3435 bool in_loop_body_p
;
3438 /* A stack of the currently active switch statements. The innermost
3439 switch statement is on the top of the stack. There is no need to
3440 mark the stack for garbage collection because it is only active
3441 during the processing of the body of a function, and we never
3442 collect at that point. */
3444 static struct cp_switch
*switch_stack
;
3446 /* Called right after a switch-statement condition is parsed.
3447 SWITCH_STMT is the switch statement being parsed. */
3450 push_switch (tree switch_stmt
)
3452 struct cp_switch
*p
= XNEW (struct cp_switch
);
3453 p
->level
= current_binding_level
;
3454 p
->next
= switch_stack
;
3455 p
->switch_stmt
= switch_stmt
;
3456 p
->cases
= splay_tree_new (case_compare
, NULL
, NULL
);
3457 p
->outside_range_p
= false;
3458 p
->has_default_p
= false;
3459 p
->break_stmt_seen_p
= false;
3460 p
->in_loop_body_p
= false;
3467 struct cp_switch
*cs
= switch_stack
;
3468 location_t switch_location
;
3470 /* Emit warnings as needed. */
3471 switch_location
= EXPR_LOC_OR_LOC (cs
->switch_stmt
, input_location
);
3472 const bool bool_cond_p
3473 = (SWITCH_STMT_TYPE (cs
->switch_stmt
)
3474 && TREE_CODE (SWITCH_STMT_TYPE (cs
->switch_stmt
)) == BOOLEAN_TYPE
);
3475 if (!processing_template_decl
)
3476 c_do_switch_warnings (cs
->cases
, switch_location
,
3477 SWITCH_STMT_TYPE (cs
->switch_stmt
),
3478 SWITCH_STMT_COND (cs
->switch_stmt
),
3479 bool_cond_p
, cs
->outside_range_p
);
3481 /* For the benefit of block_may_fallthru remember if the switch body
3482 case labels cover all possible values and if there are break; stmts. */
3483 if (cs
->has_default_p
3484 || (!processing_template_decl
3485 && c_switch_covers_all_cases_p (cs
->cases
,
3486 SWITCH_STMT_TYPE (cs
->switch_stmt
))))
3487 SWITCH_STMT_ALL_CASES_P (cs
->switch_stmt
) = 1;
3488 if (!cs
->break_stmt_seen_p
)
3489 SWITCH_STMT_NO_BREAK_P (cs
->switch_stmt
) = 1;
3490 gcc_assert (!cs
->in_loop_body_p
);
3491 splay_tree_delete (cs
->cases
);
3492 switch_stack
= switch_stack
->next
;
3496 /* Note that a BREAK_STMT is about to be added. If it is inside of
3497 a SWITCH_STMT and not inside of a loop body inside of it, note
3498 in switch_stack we've seen a BREAK_STMT. */
3501 note_break_stmt (void)
3503 if (switch_stack
&& !switch_stack
->in_loop_body_p
)
3504 switch_stack
->break_stmt_seen_p
= true;
3507 /* Note the start of processing of an iteration statement's body.
3508 The note_break_stmt function will do nothing while processing it.
3509 Return a flag that should be passed to note_iteration_stmt_body_end. */
3512 note_iteration_stmt_body_start (void)
3516 bool ret
= switch_stack
->in_loop_body_p
;
3517 switch_stack
->in_loop_body_p
= true;
3521 /* Note the end of processing of an iteration statement's body. */
3524 note_iteration_stmt_body_end (bool prev
)
3527 switch_stack
->in_loop_body_p
= prev
;
3530 /* Convert a case constant VALUE in a switch to the type TYPE of the switch
3531 condition. Note that if TYPE and VALUE are already integral we don't
3532 really do the conversion because the language-independent
3533 warning/optimization code will work better that way. */
3536 case_conversion (tree type
, tree value
)
3538 if (value
== NULL_TREE
)
3541 value
= mark_rvalue_use (value
);
3543 if (cxx_dialect
>= cxx11
3544 && (SCOPED_ENUM_P (type
)
3545 || !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (value
))))
3547 if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type
))
3548 type
= type_promotes_to (type
);
3549 value
= (perform_implicit_conversion_flags
3550 (type
, value
, tf_warning_or_error
,
3551 LOOKUP_IMPLICIT
| LOOKUP_NO_NON_INTEGRAL
));
3553 return cxx_constant_value (value
);
3556 /* Note that we've seen a definition of a case label, and complain if this
3557 is a bad place for one. */
3560 finish_case_label (location_t loc
, tree low_value
, tree high_value
)
3563 cp_binding_level
*p
;
3566 if (low_value
== NULL_TREE
&& high_value
== NULL_TREE
)
3567 switch_stack
->has_default_p
= true;
3569 if (processing_template_decl
)
3573 /* For templates, just add the case label; we'll do semantic
3574 analysis at instantiation-time. */
3575 label
= build_decl (loc
, LABEL_DECL
, NULL_TREE
, NULL_TREE
);
3576 return add_stmt (build_case_label (low_value
, high_value
, label
));
3579 /* Find the condition on which this switch statement depends. */
3580 cond
= SWITCH_STMT_COND (switch_stack
->switch_stmt
);
3581 if (cond
&& TREE_CODE (cond
) == TREE_LIST
)
3582 cond
= TREE_VALUE (cond
);
3584 if (!check_switch_goto (switch_stack
->level
))
3585 return error_mark_node
;
3587 type
= SWITCH_STMT_TYPE (switch_stack
->switch_stmt
);
3589 low_value
= case_conversion (type
, low_value
);
3590 high_value
= case_conversion (type
, high_value
);
3592 r
= c_add_case_label (loc
, switch_stack
->cases
, cond
, type
,
3593 low_value
, high_value
,
3594 &switch_stack
->outside_range_p
);
3596 /* After labels, make any new cleanups in the function go into their
3597 own new (temporary) binding contour. */
3598 for (p
= current_binding_level
;
3599 p
->kind
!= sk_function_parms
;
3601 p
->more_cleanups_ok
= 0;
3606 struct typename_info
{
3614 struct typename_hasher
: ggc_ptr_hash
<tree_node
>
3616 typedef typename_info
*compare_type
;
3618 /* Hash a TYPENAME_TYPE. */
3625 hash
= (htab_hash_pointer (TYPE_CONTEXT (t
))
3626 ^ htab_hash_pointer (TYPE_IDENTIFIER (t
)));
3631 /* Compare two TYPENAME_TYPEs. */
3634 equal (tree t1
, const typename_info
*t2
)
3636 return (TYPE_IDENTIFIER (t1
) == t2
->name
3637 && TYPE_CONTEXT (t1
) == t2
->scope
3638 && TYPENAME_TYPE_FULLNAME (t1
) == t2
->template_id
3639 && TYPENAME_IS_ENUM_P (t1
) == t2
->enum_p
3640 && TYPENAME_IS_CLASS_P (t1
) == t2
->class_p
);
3644 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
3645 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
3647 Returns the new TYPENAME_TYPE. */
3649 static GTY (()) hash_table
<typename_hasher
> *typename_htab
;
3652 build_typename_type (tree context
, tree name
, tree fullname
,
3653 enum tag_types tag_type
)
3661 if (typename_htab
== NULL
)
3662 typename_htab
= hash_table
<typename_hasher
>::create_ggc (61);
3664 ti
.scope
= FROB_CONTEXT (context
);
3666 ti
.template_id
= fullname
;
3667 ti
.enum_p
= tag_type
== enum_type
;
3668 ti
.class_p
= (tag_type
== class_type
3669 || tag_type
== record_type
3670 || tag_type
== union_type
);
3671 hash
= (htab_hash_pointer (ti
.scope
)
3672 ^ htab_hash_pointer (ti
.name
));
3674 /* See if we already have this type. */
3675 e
= typename_htab
->find_slot_with_hash (&ti
, hash
, INSERT
);
3680 /* Build the TYPENAME_TYPE. */
3681 t
= cxx_make_type (TYPENAME_TYPE
);
3682 TYPE_CONTEXT (t
) = ti
.scope
;
3683 TYPENAME_TYPE_FULLNAME (t
) = ti
.template_id
;
3684 TYPENAME_IS_ENUM_P (t
) = ti
.enum_p
;
3685 TYPENAME_IS_CLASS_P (t
) = ti
.class_p
;
3687 /* Build the corresponding TYPE_DECL. */
3688 d
= build_decl (input_location
, TYPE_DECL
, name
, t
);
3689 TYPE_NAME (TREE_TYPE (d
)) = d
;
3690 TYPE_STUB_DECL (TREE_TYPE (d
)) = d
;
3691 DECL_CONTEXT (d
) = FROB_CONTEXT (context
);
3692 DECL_ARTIFICIAL (d
) = 1;
3694 /* Store it in the hash table. */
3697 /* TYPENAME_TYPEs must always be compared structurally, because
3698 they may or may not resolve down to another type depending on
3699 the currently open classes. */
3700 SET_TYPE_STRUCTURAL_EQUALITY (t
);
3706 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
3707 provided to name the type. Returns an appropriate type, unless an
3708 error occurs, in which case error_mark_node is returned. If we
3709 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
3710 return that, rather than the _TYPE it corresponds to, in other
3711 cases we look through the type decl. If TF_ERROR is set, complain
3712 about errors, otherwise be quiet. */
3715 make_typename_type (tree context
, tree name
, enum tag_types tag_type
,
3716 tsubst_flags_t complain
)
3722 if (name
== error_mark_node
3723 || context
== NULL_TREE
3724 || context
== error_mark_node
)
3725 return error_mark_node
;
3729 if (!(TYPE_LANG_SPECIFIC (name
)
3730 && (CLASSTYPE_IS_TEMPLATE (name
)
3731 || CLASSTYPE_USE_TEMPLATE (name
))))
3732 name
= TYPE_IDENTIFIER (name
);
3734 /* Create a TEMPLATE_ID_EXPR for the type. */
3735 name
= build_nt (TEMPLATE_ID_EXPR
,
3736 CLASSTYPE_TI_TEMPLATE (name
),
3737 CLASSTYPE_TI_ARGS (name
));
3739 else if (TREE_CODE (name
) == TYPE_DECL
)
3740 name
= DECL_NAME (name
);
3744 if (TREE_CODE (name
) == TEMPLATE_ID_EXPR
)
3746 name
= TREE_OPERAND (name
, 0);
3747 if (DECL_TYPE_TEMPLATE_P (name
))
3748 name
= TREE_OPERAND (fullname
, 0) = DECL_NAME (name
);
3749 if (TREE_CODE (name
) != IDENTIFIER_NODE
)
3751 if (complain
& tf_error
)
3752 error ("%qD is not a type", name
);
3753 return error_mark_node
;
3756 if (TREE_CODE (name
) == TEMPLATE_DECL
)
3758 if (complain
& tf_error
)
3759 error ("%qD used without template parameters", name
);
3760 return error_mark_node
;
3762 gcc_assert (identifier_p (name
));
3763 gcc_assert (TYPE_P (context
));
3765 if (!MAYBE_CLASS_TYPE_P (context
))
3767 if (complain
& tf_error
)
3768 error ("%q#T is not a class", context
);
3769 return error_mark_node
;
3772 /* When the CONTEXT is a dependent type, NAME could refer to a
3773 dependent base class of CONTEXT. But look inside it anyway
3774 if CONTEXT is a currently open scope, in case it refers to a
3775 member of the current instantiation or a non-dependent base;
3776 lookup will stop when we hit a dependent base. */
3777 if (!dependent_scope_p (context
))
3778 /* We should only set WANT_TYPE when we're a nested typename type.
3779 Then we can give better diagnostics if we find a non-type. */
3780 t
= lookup_field (context
, name
, 2, /*want_type=*/true);
3784 if ((!t
|| TREE_CODE (t
) == TREE_LIST
) && dependent_type_p (context
))
3785 return build_typename_type (context
, name
, fullname
, tag_type
);
3787 want_template
= TREE_CODE (fullname
) == TEMPLATE_ID_EXPR
;
3791 if (complain
& tf_error
)
3793 if (!COMPLETE_TYPE_P (context
))
3794 cxx_incomplete_type_error (NULL_TREE
, context
);
3796 error (want_template
? G_("no class template named %q#T in %q#T")
3797 : G_("no type named %q#T in %q#T"), name
, context
);
3799 return error_mark_node
;
3802 /* Pull out the template from an injected-class-name (or multiple). */
3804 t
= maybe_get_template_decl_from_type_decl (t
);
3806 if (TREE_CODE (t
) == TREE_LIST
)
3808 if (complain
& tf_error
)
3810 error ("lookup of %qT in %qT is ambiguous", name
, context
);
3811 print_candidates (t
);
3813 return error_mark_node
;
3816 if (want_template
&& !DECL_TYPE_TEMPLATE_P (t
))
3818 if (complain
& tf_error
)
3819 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3821 return error_mark_node
;
3823 if (!want_template
&& TREE_CODE (t
) != TYPE_DECL
)
3825 if (complain
& tf_error
)
3826 error ("%<typename %T::%D%> names %q#T, which is not a type",
3828 return error_mark_node
;
3831 if (!perform_or_defer_access_check (TYPE_BINFO (context
), t
, t
, complain
))
3832 return error_mark_node
;
3834 /* If we are currently parsing a template and if T is a typedef accessed
3835 through CONTEXT then we need to remember and check access of T at
3836 template instantiation time. */
3837 add_typedef_to_current_template_for_access_check (t
, context
, input_location
);
3840 return lookup_template_class (t
, TREE_OPERAND (fullname
, 1),
3842 /*entering_scope=*/0,
3843 complain
| tf_user
);
3845 if (DECL_ARTIFICIAL (t
) || !(complain
& tf_keep_type_decl
))
3848 maybe_record_typedef_use (t
);
3853 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3854 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3855 in which case error_mark_node is returned.
3857 If PARM_LIST is non-NULL, also make sure that the template parameter
3858 list of TEMPLATE_DECL matches.
3860 If COMPLAIN zero, don't complain about any errors that occur. */
3863 make_unbound_class_template (tree context
, tree name
, tree parm_list
,
3864 tsubst_flags_t complain
)
3870 name
= TYPE_IDENTIFIER (name
);
3871 else if (DECL_P (name
))
3872 name
= DECL_NAME (name
);
3873 gcc_assert (identifier_p (name
));
3875 if (!dependent_type_p (context
)
3876 || currently_open_class (context
))
3878 tree tmpl
= NULL_TREE
;
3880 if (MAYBE_CLASS_TYPE_P (context
))
3881 tmpl
= lookup_field (context
, name
, 0, false);
3883 if (tmpl
&& TREE_CODE (tmpl
) == TYPE_DECL
)
3884 tmpl
= maybe_get_template_decl_from_type_decl (tmpl
);
3886 if (!tmpl
|| !DECL_TYPE_TEMPLATE_P (tmpl
))
3888 if (complain
& tf_error
)
3889 error ("no class template named %q#T in %q#T", name
, context
);
3890 return error_mark_node
;
3894 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl
), parm_list
))
3896 if (complain
& tf_error
)
3898 error ("template parameters do not match template %qD", tmpl
);
3899 inform (DECL_SOURCE_LOCATION (tmpl
),
3900 "%qD declared here", tmpl
);
3902 return error_mark_node
;
3905 if (!perform_or_defer_access_check (TYPE_BINFO (context
), tmpl
, tmpl
,
3907 return error_mark_node
;
3912 /* Build the UNBOUND_CLASS_TEMPLATE. */
3913 t
= cxx_make_type (UNBOUND_CLASS_TEMPLATE
);
3914 TYPE_CONTEXT (t
) = FROB_CONTEXT (context
);
3915 TREE_TYPE (t
) = NULL_TREE
;
3916 SET_TYPE_STRUCTURAL_EQUALITY (t
);
3918 /* Build the corresponding TEMPLATE_DECL. */
3919 d
= build_decl (input_location
, TEMPLATE_DECL
, name
, t
);
3920 TYPE_NAME (TREE_TYPE (d
)) = d
;
3921 TYPE_STUB_DECL (TREE_TYPE (d
)) = d
;
3922 DECL_CONTEXT (d
) = FROB_CONTEXT (context
);
3923 DECL_ARTIFICIAL (d
) = 1;
3924 DECL_TEMPLATE_PARMS (d
) = parm_list
;
3931 /* Push the declarations of builtin types into the global namespace.
3932 RID_INDEX is the index of the builtin type in the array
3933 RID_POINTERS. NAME is the name used when looking up the builtin
3934 type. TYPE is the _TYPE node for the builtin type.
3936 The calls to set_global_binding below should be
3937 eliminated. Built-in types should not be looked up name; their
3938 names are keywords that the parser can recognize. However, there
3939 is code in c-common.c that uses identifier_global_value to look up
3940 built-in types by name. */
3943 record_builtin_type (enum rid rid_index
,
3947 tree decl
= NULL_TREE
;
3951 tree tname
= get_identifier (name
);
3952 tree tdecl
= build_decl (BUILTINS_LOCATION
, TYPE_DECL
, tname
, type
);
3953 DECL_ARTIFICIAL (tdecl
) = 1;
3954 set_global_binding (tdecl
);
3958 if ((int) rid_index
< (int) RID_MAX
)
3959 if (tree rname
= ridpointers
[(int) rid_index
])
3960 if (!decl
|| DECL_NAME (decl
) != rname
)
3962 tree rdecl
= build_decl (BUILTINS_LOCATION
, TYPE_DECL
, rname
, type
);
3963 DECL_ARTIFICIAL (rdecl
) = 1;
3964 set_global_binding (rdecl
);
3971 if (!TYPE_NAME (type
))
3972 TYPE_NAME (type
) = decl
;
3973 debug_hooks
->type_decl (decl
, 0);
3977 /* Push a type into the namespace so that the back ends ignore it. */
3980 record_unknown_type (tree type
, const char* name
)
3982 tree decl
= pushdecl (build_decl (UNKNOWN_LOCATION
,
3983 TYPE_DECL
, get_identifier (name
), type
));
3984 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3985 DECL_IGNORED_P (decl
) = 1;
3986 TYPE_DECL_SUPPRESS_DEBUG (decl
) = 1;
3987 TYPE_SIZE (type
) = TYPE_SIZE (void_type_node
);
3988 SET_TYPE_ALIGN (type
, 1);
3989 TYPE_USER_ALIGN (type
) = 0;
3990 SET_TYPE_MODE (type
, TYPE_MODE (void_type_node
));
3993 /* Create all the predefined identifiers. */
3996 initialize_predefined_identifiers (void)
3998 struct predefined_identifier
4000 const char *name
; /* Name. */
4001 tree
*node
; /* Node to store it in. */
4002 cp_identifier_kind kind
; /* Kind of identifier. */
4005 /* A table of identifiers to create at startup. */
4006 static const predefined_identifier predefined_identifiers
[] = {
4007 {"C++", &lang_name_cplusplus
, cik_normal
},
4008 {"C", &lang_name_c
, cik_normal
},
4009 /* Some of these names have a trailing space so that it is
4010 impossible for them to conflict with names written by users. */
4011 {"__ct ", &ctor_identifier
, cik_ctor
},
4012 {"__ct_base ", &base_ctor_identifier
, cik_ctor
},
4013 {"__ct_comp ", &complete_ctor_identifier
, cik_ctor
},
4014 {"__dt ", &dtor_identifier
, cik_dtor
},
4015 {"__dt_base ", &base_dtor_identifier
, cik_dtor
},
4016 {"__dt_comp ", &complete_dtor_identifier
, cik_dtor
},
4017 {"__dt_del ", &deleting_dtor_identifier
, cik_dtor
},
4018 {"__conv_op ", &conv_op_identifier
, cik_conv_op
},
4019 {"__in_chrg", &in_charge_identifier
, cik_normal
},
4020 {"this", &this_identifier
, cik_normal
},
4021 {"__delta", &delta_identifier
, cik_normal
},
4022 {"__pfn", &pfn_identifier
, cik_normal
},
4023 {"_vptr", &vptr_identifier
, cik_normal
},
4024 {"__vtt_parm", &vtt_parm_identifier
, cik_normal
},
4025 {"::", &global_identifier
, cik_normal
},
4026 {"std", &std_identifier
, cik_normal
},
4027 /* The demangler expects anonymous namespaces to be called
4028 something starting with '_GLOBAL__N_'. It no longer needs
4029 to be unique to the TU. */
4030 {"_GLOBAL__N_1", &anon_identifier
, cik_normal
},
4031 {"auto", &auto_identifier
, cik_normal
},
4032 {"decltype(auto)", &decltype_auto_identifier
, cik_normal
},
4033 {"initializer_list", &init_list_identifier
, cik_normal
},
4034 {NULL
, NULL
, cik_normal
}
4037 for (const predefined_identifier
*pid
= predefined_identifiers
;
4040 *pid
->node
= get_identifier (pid
->name
);
4041 /* Some of these identifiers already have a special kind. */
4042 if (pid
->kind
!= cik_normal
)
4043 set_identifier_kind (*pid
->node
, pid
->kind
);
4047 /* Create the predefined scalar types of C,
4048 and some nodes representing standard constants (0, 1, (void *)0).
4049 Initialize the global binding level.
4050 Make definitions for built-in primitive functions. */
4053 cxx_init_decl_processing (void)
4056 tree void_ftype_ptr
;
4058 /* Create all the identifiers we need. */
4059 initialize_predefined_identifiers ();
4061 /* Create the global variables. */
4062 push_to_top_level ();
4064 current_function_decl
= NULL_TREE
;
4065 current_binding_level
= NULL
;
4066 /* Enter the global namespace. */
4067 gcc_assert (global_namespace
== NULL_TREE
);
4068 global_namespace
= build_lang_decl (NAMESPACE_DECL
, global_identifier
,
4070 TREE_PUBLIC (global_namespace
) = 1;
4071 DECL_CONTEXT (global_namespace
)
4072 = build_translation_unit_decl (get_identifier (main_input_filename
));
4073 /* Remember whether we want the empty class passing ABI change warning
4075 TRANSLATION_UNIT_WARN_EMPTY_P (DECL_CONTEXT (global_namespace
))
4076 = warn_abi
&& abi_version_crosses (12);
4077 debug_hooks
->register_main_translation_unit
4078 (DECL_CONTEXT (global_namespace
));
4079 begin_scope (sk_namespace
, global_namespace
);
4080 current_namespace
= global_namespace
;
4082 if (flag_visibility_ms_compat
)
4083 default_visibility
= VISIBILITY_HIDDEN
;
4086 current_lang_name
= lang_name_c
;
4088 /* Create the `std' namespace. */
4089 push_namespace (std_identifier
);
4090 std_node
= current_namespace
;
4093 flag_noexcept_type
= (cxx_dialect
>= cxx17
);
4094 if (!flag_new_for_scope
)
4095 warning (OPT_Wdeprecated
, "%<-fno-for-scope%> is deprecated");
4097 c_common_nodes_and_builtins ();
4099 integer_two_node
= build_int_cst (NULL_TREE
, 2);
4101 /* Guess at the initial static decls size. */
4102 vec_alloc (static_decls
, 500);
4104 /* ... and keyed classes. */
4105 vec_alloc (keyed_classes
, 100);
4107 record_builtin_type (RID_BOOL
, "bool", boolean_type_node
);
4108 truthvalue_type_node
= boolean_type_node
;
4109 truthvalue_false_node
= boolean_false_node
;
4110 truthvalue_true_node
= boolean_true_node
;
4112 empty_except_spec
= build_tree_list (NULL_TREE
, NULL_TREE
);
4113 noexcept_true_spec
= build_tree_list (boolean_true_node
, NULL_TREE
);
4114 noexcept_false_spec
= build_tree_list (boolean_false_node
, NULL_TREE
);
4115 noexcept_deferred_spec
= build_tree_list (make_node (DEFERRED_NOEXCEPT
),
4119 record_builtin_type (RID_MAX
, NULL
, string_type_node
);
4122 delta_type_node
= ptrdiff_type_node
;
4123 vtable_index_type
= ptrdiff_type_node
;
4125 vtt_parm_type
= build_pointer_type (const_ptr_type_node
);
4126 void_ftype
= build_function_type_list (void_type_node
, NULL_TREE
);
4127 void_ftype_ptr
= build_function_type_list (void_type_node
,
4128 ptr_type_node
, NULL_TREE
);
4130 = build_exception_variant (void_ftype_ptr
, empty_except_spec
);
4132 /* Create the conversion operator marker. This operator's DECL_NAME
4133 is in the identifier table, so we can use identifier equality to
4135 conv_op_marker
= build_lang_decl (FUNCTION_DECL
, conv_op_identifier
,
4138 /* C++ extensions */
4140 unknown_type_node
= make_node (LANG_TYPE
);
4141 record_unknown_type (unknown_type_node
, "unknown type");
4143 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
4144 TREE_TYPE (unknown_type_node
) = unknown_type_node
;
4146 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
4148 TYPE_POINTER_TO (unknown_type_node
) = unknown_type_node
;
4149 TYPE_REFERENCE_TO (unknown_type_node
) = unknown_type_node
;
4151 init_list_type_node
= make_node (LANG_TYPE
);
4152 record_unknown_type (init_list_type_node
, "init list");
4155 /* Make sure we get a unique function type, so we can give
4156 its pointer type a name. (This wins for gdb.) */
4157 tree vfunc_type
= make_node (FUNCTION_TYPE
);
4158 TREE_TYPE (vfunc_type
) = integer_type_node
;
4159 TYPE_ARG_TYPES (vfunc_type
) = NULL_TREE
;
4160 layout_type (vfunc_type
);
4162 vtable_entry_type
= build_pointer_type (vfunc_type
);
4164 record_builtin_type (RID_MAX
, "__vtbl_ptr_type", vtable_entry_type
);
4167 = build_cplus_array_type (vtable_entry_type
, NULL_TREE
);
4168 layout_type (vtbl_type_node
);
4169 vtbl_type_node
= cp_build_qualified_type (vtbl_type_node
, TYPE_QUAL_CONST
);
4170 record_builtin_type (RID_MAX
, NULL
, vtbl_type_node
);
4171 vtbl_ptr_type_node
= build_pointer_type (vtable_entry_type
);
4172 layout_type (vtbl_ptr_type_node
);
4173 record_builtin_type (RID_MAX
, NULL
, vtbl_ptr_type_node
);
4175 push_namespace (get_identifier ("__cxxabiv1"));
4176 abi_node
= current_namespace
;
4179 global_type_node
= make_node (LANG_TYPE
);
4180 record_unknown_type (global_type_node
, "global type");
4182 any_targ_node
= make_node (LANG_TYPE
);
4183 record_unknown_type (any_targ_node
, "any type");
4186 current_lang_name
= lang_name_cplusplus
;
4188 if (aligned_new_threshold
> 1
4189 && !pow2p_hwi (aligned_new_threshold
))
4191 error ("-faligned-new=%d is not a power of two", aligned_new_threshold
);
4192 aligned_new_threshold
= 1;
4194 if (aligned_new_threshold
== -1)
4195 aligned_new_threshold
= (cxx_dialect
>= cxx17
) ? 1 : 0;
4196 if (aligned_new_threshold
== 1)
4197 aligned_new_threshold
= malloc_alignment () / BITS_PER_UNIT
;
4200 tree newattrs
, extvisattr
;
4201 tree newtype
, deltype
;
4202 tree ptr_ftype_sizetype
;
4206 = build_function_type_list (ptr_type_node
, size_type_node
, NULL_TREE
);
4207 if (cxx_dialect
== cxx98
)
4210 tree bad_alloc_type_node
;
4211 tree bad_alloc_decl
;
4213 push_namespace (std_identifier
);
4214 bad_alloc_id
= get_identifier ("bad_alloc");
4215 bad_alloc_type_node
= make_class_type (RECORD_TYPE
);
4216 TYPE_CONTEXT (bad_alloc_type_node
) = current_namespace
;
4218 = create_implicit_typedef (bad_alloc_id
, bad_alloc_type_node
);
4219 DECL_CONTEXT (bad_alloc_decl
) = current_namespace
;
4223 = add_exception_specifier (NULL_TREE
, bad_alloc_type_node
, -1);
4226 new_eh_spec
= noexcept_false_spec
;
4228 /* Ensure attribs.c is initialized. */
4231 /* Ensure constraint.cc is initialized. */
4232 init_constraint_processing ();
4234 extvisattr
= build_tree_list (get_identifier ("externally_visible"),
4236 newattrs
= tree_cons (get_identifier ("alloc_size"),
4237 build_tree_list (NULL_TREE
, integer_one_node
),
4239 newtype
= cp_build_type_attribute_variant (ptr_ftype_sizetype
, newattrs
);
4240 newtype
= build_exception_variant (newtype
, new_eh_spec
);
4241 deltype
= cp_build_type_attribute_variant (void_ftype_ptr
, extvisattr
);
4242 deltype
= build_exception_variant (deltype
, empty_except_spec
);
4243 tree opnew
= push_cp_library_fn (NEW_EXPR
, newtype
, 0);
4244 DECL_IS_MALLOC (opnew
) = 1;
4245 DECL_IS_OPERATOR_NEW (opnew
) = 1;
4246 opnew
= push_cp_library_fn (VEC_NEW_EXPR
, newtype
, 0);
4247 DECL_IS_MALLOC (opnew
) = 1;
4248 DECL_IS_OPERATOR_NEW (opnew
) = 1;
4249 push_cp_library_fn (DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4250 push_cp_library_fn (VEC_DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4251 if (flag_sized_deallocation
)
4253 /* Also push the sized deallocation variants:
4254 void operator delete(void*, std::size_t) throw();
4255 void operator delete[](void*, std::size_t) throw(); */
4256 tree void_ftype_ptr_size
4257 = build_function_type_list (void_type_node
, ptr_type_node
,
4258 size_type_node
, NULL_TREE
);
4259 deltype
= cp_build_type_attribute_variant (void_ftype_ptr_size
,
4261 deltype
= build_exception_variant (deltype
, empty_except_spec
);
4262 push_cp_library_fn (DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4263 push_cp_library_fn (VEC_DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4266 if (aligned_new_threshold
)
4268 push_namespace (std_identifier
);
4269 tree align_id
= get_identifier ("align_val_t");
4270 align_type_node
= start_enum (align_id
, NULL_TREE
, size_type_node
,
4271 NULL_TREE
, /*scoped*/true, NULL
);
4274 /* operator new (size_t, align_val_t); */
4275 newtype
= build_function_type_list (ptr_type_node
, size_type_node
,
4276 align_type_node
, NULL_TREE
);
4277 newtype
= cp_build_type_attribute_variant (newtype
, newattrs
);
4278 newtype
= build_exception_variant (newtype
, new_eh_spec
);
4279 opnew
= push_cp_library_fn (NEW_EXPR
, newtype
, 0);
4280 DECL_IS_MALLOC (opnew
) = 1;
4281 DECL_IS_OPERATOR_NEW (opnew
) = 1;
4282 opnew
= push_cp_library_fn (VEC_NEW_EXPR
, newtype
, 0);
4283 DECL_IS_MALLOC (opnew
) = 1;
4284 DECL_IS_OPERATOR_NEW (opnew
) = 1;
4286 /* operator delete (void *, align_val_t); */
4287 deltype
= build_function_type_list (void_type_node
, ptr_type_node
,
4288 align_type_node
, NULL_TREE
);
4289 deltype
= cp_build_type_attribute_variant (deltype
, extvisattr
);
4290 deltype
= build_exception_variant (deltype
, empty_except_spec
);
4291 push_cp_library_fn (DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4292 push_cp_library_fn (VEC_DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4294 if (flag_sized_deallocation
)
4296 /* operator delete (void *, size_t, align_val_t); */
4297 deltype
= build_function_type_list (void_type_node
, ptr_type_node
,
4298 size_type_node
, align_type_node
,
4300 deltype
= cp_build_type_attribute_variant (deltype
, extvisattr
);
4301 deltype
= build_exception_variant (deltype
, empty_except_spec
);
4302 push_cp_library_fn (DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4303 push_cp_library_fn (VEC_DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4307 nullptr_type_node
= make_node (NULLPTR_TYPE
);
4308 TYPE_SIZE (nullptr_type_node
) = bitsize_int (GET_MODE_BITSIZE (ptr_mode
));
4309 TYPE_SIZE_UNIT (nullptr_type_node
) = size_int (GET_MODE_SIZE (ptr_mode
));
4310 TYPE_UNSIGNED (nullptr_type_node
) = 1;
4311 TYPE_PRECISION (nullptr_type_node
) = GET_MODE_BITSIZE (ptr_mode
);
4312 if (abi_version_at_least (9))
4313 SET_TYPE_ALIGN (nullptr_type_node
, GET_MODE_ALIGNMENT (ptr_mode
));
4314 SET_TYPE_MODE (nullptr_type_node
, ptr_mode
);
4315 record_builtin_type (RID_MAX
, "decltype(nullptr)", nullptr_type_node
);
4316 nullptr_node
= build_int_cst (nullptr_type_node
, 0);
4320 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype
,
4321 ECF_NORETURN
| ECF_NOTHROW
| ECF_COLD
);
4323 /* Perform other language dependent initializations. */
4324 init_class_processing ();
4325 init_rtti_processing ();
4326 init_template_processing ();
4328 if (flag_exceptions
)
4329 init_exception_processing ();
4331 if (! supports_one_only ())
4334 make_fname_decl
= cp_make_fname_decl
;
4335 start_fname_decls ();
4337 /* Show we use EH for cleanups. */
4338 if (flag_exceptions
)
4339 using_eh_for_cleanups ();
4342 /* Generate an initializer for a function naming variable from
4343 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
4344 filled in with the type of the init. */
4347 cp_fname_init (const char* name
, tree
*type_p
)
4349 tree domain
= NULL_TREE
;
4351 tree init
= NULL_TREE
;
4356 length
= strlen (name
);
4357 domain
= build_index_type (size_int (length
));
4358 init
= build_string (length
+ 1, name
);
4361 type
= cp_build_qualified_type (char_type_node
, TYPE_QUAL_CONST
);
4362 type
= build_cplus_array_type (type
, domain
);
4367 TREE_TYPE (init
) = type
;
4369 init
= error_mark_node
;
4374 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
4375 the decl, LOC is the location to give the decl, NAME is the
4376 initialization string and TYPE_DEP indicates whether NAME depended
4377 on the type of the function. We make use of that to detect
4378 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
4379 at the point of first use, so we mustn't push the decl now. */
4382 cp_make_fname_decl (location_t loc
, tree id
, int type_dep
)
4384 const char *const name
= (type_dep
&& processing_template_decl
4385 ? NULL
: fname_as_string (type_dep
));
4387 tree init
= cp_fname_init (name
, &type
);
4388 tree decl
= build_decl (loc
, VAR_DECL
, id
, type
);
4391 free (CONST_CAST (char *, name
));
4393 TREE_STATIC (decl
) = 1;
4394 TREE_READONLY (decl
) = 1;
4395 DECL_ARTIFICIAL (decl
) = 1;
4397 TREE_USED (decl
) = 1;
4399 if (current_function_decl
)
4401 DECL_CONTEXT (decl
) = current_function_decl
;
4402 decl
= pushdecl_outermost_localscope (decl
);
4403 cp_finish_decl (decl
, init
, /*init_const_expr_p=*/false, NULL_TREE
,
4404 LOOKUP_ONLYCONVERTING
);
4408 DECL_THIS_STATIC (decl
) = true;
4409 pushdecl_top_level_and_finish (decl
, init
);
4416 builtin_function_1 (tree decl
, tree context
, bool is_global
)
4418 tree id
= DECL_NAME (decl
);
4419 const char *name
= IDENTIFIER_POINTER (id
);
4421 retrofit_lang_decl (decl
);
4423 DECL_ARTIFICIAL (decl
) = 1;
4424 SET_DECL_LANGUAGE (decl
, lang_c
);
4425 /* Runtime library routines are, by definition, available in an
4426 external shared object. */
4427 DECL_VISIBILITY (decl
) = VISIBILITY_DEFAULT
;
4428 DECL_VISIBILITY_SPECIFIED (decl
) = 1;
4430 DECL_CONTEXT (decl
) = context
;
4432 /* A function in the user's namespace should have an explicit
4433 declaration before it is used. Mark the built-in function as
4434 anticipated but not actually declared. */
4435 if (name
[0] != '_' || name
[1] != '_')
4436 DECL_ANTICIPATED (decl
) = 1;
4437 else if (strncmp (name
+ 2, "builtin_", strlen ("builtin_")) != 0)
4439 size_t len
= strlen (name
);
4441 /* Treat __*_chk fortification functions as anticipated as well,
4442 unless they are __builtin_*. */
4443 if (len
> strlen ("___chk")
4444 && memcmp (name
+ len
- strlen ("_chk"),
4445 "_chk", strlen ("_chk") + 1) == 0)
4446 DECL_ANTICIPATED (decl
) = 1;
4450 pushdecl_top_level (decl
);
4458 cxx_builtin_function (tree decl
)
4460 tree id
= DECL_NAME (decl
);
4461 const char *name
= IDENTIFIER_POINTER (id
);
4462 /* All builtins that don't begin with an '_' should additionally
4463 go in the 'std' namespace. */
4466 tree decl2
= copy_node(decl
);
4467 push_namespace (std_identifier
);
4468 builtin_function_1 (decl2
, std_node
, false);
4472 return builtin_function_1 (decl
, NULL_TREE
, false);
4475 /* Like cxx_builtin_function, but guarantee the function is added to the global
4476 scope. This is to allow function specific options to add new machine
4477 dependent builtins when the target ISA changes via attribute((target(...)))
4478 which saves space on program startup if the program does not use non-generic
4482 cxx_builtin_function_ext_scope (tree decl
)
4485 tree id
= DECL_NAME (decl
);
4486 const char *name
= IDENTIFIER_POINTER (id
);
4487 /* All builtins that don't begin with an '_' should additionally
4488 go in the 'std' namespace. */
4491 tree decl2
= copy_node(decl
);
4492 push_namespace (std_identifier
);
4493 builtin_function_1 (decl2
, std_node
, true);
4497 return builtin_function_1 (decl
, NULL_TREE
, true);
4500 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
4501 function. Not called directly. */
4504 build_library_fn (tree name
, enum tree_code operator_code
, tree type
,
4507 tree fn
= build_lang_decl (FUNCTION_DECL
, name
, type
);
4508 DECL_EXTERNAL (fn
) = 1;
4509 TREE_PUBLIC (fn
) = 1;
4510 DECL_ARTIFICIAL (fn
) = 1;
4511 DECL_OVERLOADED_OPERATOR_CODE_RAW (fn
)
4512 = OVL_OP_INFO (false, operator_code
)->ovl_op_code
;
4513 SET_DECL_LANGUAGE (fn
, lang_c
);
4514 /* Runtime library routines are, by definition, available in an
4515 external shared object. */
4516 DECL_VISIBILITY (fn
) = VISIBILITY_DEFAULT
;
4517 DECL_VISIBILITY_SPECIFIED (fn
) = 1;
4518 set_call_expr_flags (fn
, ecf_flags
);
4522 /* Returns the _DECL for a library function with C++ linkage. */
4525 build_cp_library_fn (tree name
, enum tree_code operator_code
, tree type
,
4528 tree fn
= build_library_fn (name
, operator_code
, type
, ecf_flags
);
4529 DECL_CONTEXT (fn
) = FROB_CONTEXT (current_namespace
);
4530 SET_DECL_LANGUAGE (fn
, lang_cplusplus
);
4534 /* Like build_library_fn, but takes a C string instead of an
4538 build_library_fn_ptr (const char* name
, tree type
, int ecf_flags
)
4540 return build_library_fn (get_identifier (name
), ERROR_MARK
, type
, ecf_flags
);
4543 /* Like build_cp_library_fn, but takes a C string instead of an
4547 build_cp_library_fn_ptr (const char* name
, tree type
, int ecf_flags
)
4549 return build_cp_library_fn (get_identifier (name
), ERROR_MARK
, type
,
4553 /* Like build_library_fn, but also pushes the function so that we will
4554 be able to find it via get_global_binding. Also, the function
4555 may throw exceptions listed in RAISES. */
4558 push_library_fn (tree name
, tree type
, tree raises
, int ecf_flags
)
4563 type
= build_exception_variant (type
, raises
);
4565 fn
= build_library_fn (name
, ERROR_MARK
, type
, ecf_flags
);
4566 pushdecl_top_level (fn
);
4570 /* Like build_cp_library_fn, but also pushes the function so that it
4571 will be found by normal lookup. */
4574 push_cp_library_fn (enum tree_code operator_code
, tree type
,
4577 tree fn
= build_cp_library_fn (ovl_op_identifier (false, operator_code
),
4578 operator_code
, type
, ecf_flags
);
4581 apply_tm_attr (fn
, get_identifier ("transaction_safe"));
4585 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
4589 push_void_library_fn (tree name
, tree parmtypes
, int ecf_flags
)
4591 tree type
= build_function_type (void_type_node
, parmtypes
);
4592 return push_library_fn (name
, type
, NULL_TREE
, ecf_flags
);
4595 /* Like push_library_fn, but also note that this function throws
4596 and does not return. Used for __throw_foo and the like. */
4599 push_throw_library_fn (tree name
, tree type
)
4601 tree fn
= push_library_fn (name
, type
, NULL_TREE
, ECF_NORETURN
| ECF_COLD
);
4605 /* When we call finish_struct for an anonymous union, we create
4606 default copy constructors and such. But, an anonymous union
4607 shouldn't have such things; this function undoes the damage to the
4608 anonymous union type T.
4610 (The reason that we create the synthesized methods is that we don't
4611 distinguish `union { int i; }' from `typedef union { int i; } U'.
4612 The first is an anonymous union; the second is just an ordinary
4616 fixup_anonymous_aggr (tree t
)
4618 /* Wipe out memory of synthesized methods. */
4619 TYPE_HAS_USER_CONSTRUCTOR (t
) = 0;
4620 TYPE_HAS_DEFAULT_CONSTRUCTOR (t
) = 0;
4621 TYPE_HAS_COPY_CTOR (t
) = 0;
4622 TYPE_HAS_CONST_COPY_CTOR (t
) = 0;
4623 TYPE_HAS_COPY_ASSIGN (t
) = 0;
4624 TYPE_HAS_CONST_COPY_ASSIGN (t
) = 0;
4626 /* Splice the implicitly generated functions out of TYPE_FIELDS. */
4627 for (tree probe
, *prev_p
= &TYPE_FIELDS (t
); (probe
= *prev_p
);)
4628 if (TREE_CODE (probe
) == FUNCTION_DECL
&& DECL_ARTIFICIAL (probe
))
4629 *prev_p
= DECL_CHAIN (probe
);
4631 prev_p
= &DECL_CHAIN (probe
);
4633 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
4634 assignment operators (because they cannot have these methods themselves).
4635 For anonymous unions this is already checked because they are not allowed
4636 in any union, otherwise we have to check it. */
4637 if (TREE_CODE (t
) != UNION_TYPE
)
4641 for (field
= TYPE_FIELDS (t
); field
; field
= DECL_CHAIN (field
))
4642 if (TREE_CODE (field
) == FIELD_DECL
)
4644 type
= TREE_TYPE (field
);
4645 if (CLASS_TYPE_P (type
))
4647 if (TYPE_NEEDS_CONSTRUCTING (type
))
4648 error ("member %q+#D with constructor not allowed "
4649 "in anonymous aggregate", field
);
4650 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
))
4651 error ("member %q+#D with destructor not allowed "
4652 "in anonymous aggregate", field
);
4653 if (TYPE_HAS_COMPLEX_COPY_ASSIGN (type
))
4654 error ("member %q+#D with copy assignment operator "
4655 "not allowed in anonymous aggregate", field
);
4661 /* Warn for an attribute located at LOCATION that appertains to the
4662 class type CLASS_TYPE that has not been properly placed after its
4663 class-key, in it class-specifier. */
4666 warn_misplaced_attr_for_class_type (source_location location
,
4669 gcc_assert (OVERLOAD_TYPE_P (class_type
));
4671 if (warning_at (location
, OPT_Wattributes
,
4672 "attribute ignored in declaration "
4673 "of %q#T", class_type
))
4675 "attribute for %q#T must follow the %qs keyword",
4676 class_type
, class_key_or_enum_as_string (class_type
));
4679 /* Make sure that a declaration with no declarator is well-formed, i.e.
4680 just declares a tagged type or anonymous union.
4682 Returns the type declared; or NULL_TREE if none. */
4685 check_tag_decl (cp_decl_specifier_seq
*declspecs
,
4686 bool explicit_type_instantiation_p
)
4688 int saw_friend
= decl_spec_seq_has_spec_p (declspecs
, ds_friend
);
4689 int saw_typedef
= decl_spec_seq_has_spec_p (declspecs
, ds_typedef
);
4690 /* If a class, struct, or enum type is declared by the DECLSPECS
4691 (i.e, if a class-specifier, enum-specifier, or non-typename
4692 elaborated-type-specifier appears in the DECLSPECS),
4693 DECLARED_TYPE is set to the corresponding type. */
4694 tree declared_type
= NULL_TREE
;
4695 bool error_p
= false;
4697 if (declspecs
->multiple_types_p
)
4698 error ("multiple types in one declaration");
4699 else if (declspecs
->redefined_builtin_type
)
4701 if (!in_system_header_at (input_location
))
4702 permerror (declspecs
->locations
[ds_redefined_builtin_type_spec
],
4703 "redeclaration of C++ built-in type %qT",
4704 declspecs
->redefined_builtin_type
);
4709 && TYPE_P (declspecs
->type
)
4710 && ((TREE_CODE (declspecs
->type
) != TYPENAME_TYPE
4711 && MAYBE_CLASS_TYPE_P (declspecs
->type
))
4712 || TREE_CODE (declspecs
->type
) == ENUMERAL_TYPE
))
4713 declared_type
= declspecs
->type
;
4714 else if (declspecs
->type
== error_mark_node
)
4716 if (declared_type
== NULL_TREE
&& ! saw_friend
&& !error_p
)
4717 permerror (input_location
, "declaration does not declare anything");
4718 else if (declared_type
!= NULL_TREE
&& type_uses_auto (declared_type
))
4720 error_at (declspecs
->locations
[ds_type_spec
],
4721 "%<auto%> can only be specified for variables "
4722 "or function declarations");
4723 return error_mark_node
;
4725 /* Check for an anonymous union. */
4726 else if (declared_type
&& RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type
))
4727 && TYPE_UNNAMED_P (declared_type
))
4729 /* 7/3 In a simple-declaration, the optional init-declarator-list
4730 can be omitted only when declaring a class (clause 9) or
4731 enumeration (7.2), that is, when the decl-specifier-seq contains
4732 either a class-specifier, an elaborated-type-specifier with
4733 a class-key (9.1), or an enum-specifier. In these cases and
4734 whenever a class-specifier or enum-specifier is present in the
4735 decl-specifier-seq, the identifiers in these specifiers are among
4736 the names being declared by the declaration (as class-name,
4737 enum-names, or enumerators, depending on the syntax). In such
4738 cases, and except for the declaration of an unnamed bit-field (9.6),
4739 the decl-specifier-seq shall introduce one or more names into the
4740 program, or shall redeclare a name introduced by a previous
4741 declaration. [Example:
4742 enum { }; // ill-formed
4743 typedef class { }; // ill-formed
4747 error ("missing type-name in typedef-declaration");
4750 /* Anonymous unions are objects, so they can have specifiers. */;
4751 SET_ANON_AGGR_TYPE_P (declared_type
);
4753 if (TREE_CODE (declared_type
) != UNION_TYPE
4754 && !in_system_header_at (input_location
))
4755 pedwarn (input_location
, OPT_Wpedantic
, "ISO C++ prohibits anonymous structs");
4760 if (decl_spec_seq_has_spec_p (declspecs
, ds_inline
))
4761 error_at (declspecs
->locations
[ds_inline
],
4762 "%<inline%> can only be specified for functions");
4763 else if (decl_spec_seq_has_spec_p (declspecs
, ds_virtual
))
4764 error_at (declspecs
->locations
[ds_virtual
],
4765 "%<virtual%> can only be specified for functions");
4767 && (!current_class_type
4768 || current_scope () != current_class_type
))
4769 error_at (declspecs
->locations
[ds_friend
],
4770 "%<friend%> can only be specified inside a class");
4771 else if (decl_spec_seq_has_spec_p (declspecs
, ds_explicit
))
4772 error_at (declspecs
->locations
[ds_explicit
],
4773 "%<explicit%> can only be specified for constructors");
4774 else if (declspecs
->storage_class
)
4775 error_at (declspecs
->locations
[ds_storage_class
],
4776 "a storage class can only be specified for objects "
4778 else if (decl_spec_seq_has_spec_p (declspecs
, ds_const
))
4779 error_at (declspecs
->locations
[ds_const
],
4780 "%<const%> can only be specified for objects and "
4782 else if (decl_spec_seq_has_spec_p (declspecs
, ds_volatile
))
4783 error_at (declspecs
->locations
[ds_volatile
],
4784 "%<volatile%> can only be specified for objects and "
4786 else if (decl_spec_seq_has_spec_p (declspecs
, ds_restrict
))
4787 error_at (declspecs
->locations
[ds_restrict
],
4788 "%<__restrict%> can only be specified for objects and "
4790 else if (decl_spec_seq_has_spec_p (declspecs
, ds_thread
))
4791 error_at (declspecs
->locations
[ds_thread
],
4792 "%<__thread%> can only be specified for objects "
4794 else if (saw_typedef
)
4795 warning_at (declspecs
->locations
[ds_typedef
], 0,
4796 "%<typedef%> was ignored in this declaration");
4797 else if (decl_spec_seq_has_spec_p (declspecs
, ds_constexpr
))
4798 error_at (declspecs
->locations
[ds_constexpr
],
4799 "%<constexpr%> cannot be used for type declarations");
4802 if (declspecs
->attributes
&& warn_attributes
&& declared_type
)
4805 if (!CLASS_TYPE_P (declared_type
)
4806 || !CLASSTYPE_TEMPLATE_INSTANTIATION (declared_type
))
4807 /* For a non-template class, use the name location. */
4808 loc
= location_of (declared_type
);
4810 /* For a template class (an explicit instantiation), use the
4811 current location. */
4812 loc
= input_location
;
4814 if (explicit_type_instantiation_p
)
4815 /* [dcl.attr.grammar]/4:
4817 No attribute-specifier-seq shall appertain to an explicit
4820 if (warning_at (loc
, OPT_Wattributes
,
4821 "attribute ignored in explicit instantiation %q#T",
4824 "no attribute can be applied to "
4825 "an explicit instantiation");
4828 warn_misplaced_attr_for_class_type (loc
, declared_type
);
4831 return declared_type
;
4834 /* Called when a declaration is seen that contains no names to declare.
4835 If its type is a reference to a structure, union or enum inherited
4836 from a containing scope, shadow that tag name for the current scope
4837 with a forward reference.
4838 If its type defines a new named structure or union
4839 or defines an enum, it is valid but we need not do anything here.
4840 Otherwise, it is an error.
4842 C++: may have to grok the declspecs to learn about static,
4843 complain for anonymous unions.
4845 Returns the TYPE declared -- or NULL_TREE if none. */
4848 shadow_tag (cp_decl_specifier_seq
*declspecs
)
4850 tree t
= check_tag_decl (declspecs
,
4851 /*explicit_type_instantiation_p=*/false);
4856 if (maybe_process_partial_specialization (t
) == error_mark_node
)
4859 /* This is where the variables in an anonymous union are
4860 declared. An anonymous union declaration looks like:
4862 because there is no declarator after the union, the parser
4863 sends that declaration here. */
4864 if (ANON_AGGR_TYPE_P (t
))
4866 fixup_anonymous_aggr (t
);
4868 if (TYPE_FIELDS (t
))
4870 tree decl
= grokdeclarator (/*declarator=*/NULL
,
4871 declspecs
, NORMAL
, 0, NULL
);
4872 finish_anon_union (decl
);
4879 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4882 groktypename (cp_decl_specifier_seq
*type_specifiers
,
4883 const cp_declarator
*declarator
,
4884 bool is_template_arg
)
4888 enum decl_context context
4889 = is_template_arg
? TEMPLATE_TYPE_ARG
: TYPENAME
;
4890 attrs
= type_specifiers
->attributes
;
4891 type_specifiers
->attributes
= NULL_TREE
;
4892 type
= grokdeclarator (declarator
, type_specifiers
, context
, 0, &attrs
);
4893 if (attrs
&& type
!= error_mark_node
)
4895 if (CLASS_TYPE_P (type
))
4896 warning (OPT_Wattributes
, "ignoring attributes applied to class type %qT "
4897 "outside of definition", type
);
4898 else if (MAYBE_CLASS_TYPE_P (type
))
4899 /* A template type parameter or other dependent type. */
4900 warning (OPT_Wattributes
, "ignoring attributes applied to dependent "
4901 "type %qT without an associated declaration", type
);
4903 cplus_decl_attributes (&type
, attrs
, 0);
4908 /* Process a DECLARATOR for a function-scope variable declaration,
4909 namespace-scope variable declaration, or function declaration.
4910 (Function definitions go through start_function; class member
4911 declarations appearing in the body of the class go through
4912 grokfield.) The DECL corresponding to the DECLARATOR is returned.
4913 If an error occurs, the error_mark_node is returned instead.
4915 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
4916 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
4917 for an explicitly defaulted function, or SD_DELETED for an explicitly
4918 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
4919 implicitly initialized via a default constructor. ATTRIBUTES and
4920 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
4922 The scope represented by the context of the returned DECL is pushed
4923 (if it is not the global namespace) and is assigned to
4924 *PUSHED_SCOPE_P. The caller is then responsible for calling
4925 pop_scope on *PUSHED_SCOPE_P if it is set. */
4928 start_decl (const cp_declarator
*declarator
,
4929 cp_decl_specifier_seq
*declspecs
,
4932 tree prefix_attributes
,
4933 tree
*pushed_scope_p
)
4941 *pushed_scope_p
= NULL_TREE
;
4943 /* An object declared as __attribute__((deprecated)) suppresses
4944 warnings of uses of other deprecated items. */
4945 if (lookup_attribute ("deprecated", attributes
))
4946 deprecated_state
= DEPRECATED_SUPPRESS
;
4948 attributes
= chainon (attributes
, prefix_attributes
);
4950 decl
= grokdeclarator (declarator
, declspecs
, NORMAL
, initialized
,
4953 deprecated_state
= DEPRECATED_NORMAL
;
4955 if (decl
== NULL_TREE
|| VOID_TYPE_P (decl
)
4956 || decl
== error_mark_node
)
4957 return error_mark_node
;
4959 context
= CP_DECL_CONTEXT (decl
);
4960 if (context
!= global_namespace
)
4961 *pushed_scope_p
= push_scope (context
);
4963 /* Is it valid for this decl to have an initializer at all?
4964 If not, set INITIALIZED to zero, which will indirectly
4965 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4967 && TREE_CODE (decl
) == TYPE_DECL
)
4969 error ("typedef %qD is initialized (use decltype instead)", decl
);
4970 return error_mark_node
;
4975 if (! toplevel_bindings_p ()
4976 && DECL_EXTERNAL (decl
))
4977 warning (0, "declaration of %q#D has %<extern%> and is initialized",
4979 DECL_EXTERNAL (decl
) = 0;
4980 if (toplevel_bindings_p ())
4981 TREE_STATIC (decl
) = 1;
4983 alias
= lookup_attribute ("alias", DECL_ATTRIBUTES (decl
)) != 0;
4985 if (alias
&& TREE_CODE (decl
) == FUNCTION_DECL
)
4986 record_key_method_defined (decl
);
4988 /* If this is a typedef that names the class for linkage purposes
4989 (7.1.3p8), apply any attributes directly to the type. */
4990 if (TREE_CODE (decl
) == TYPE_DECL
4991 && OVERLOAD_TYPE_P (TREE_TYPE (decl
))
4992 && decl
== TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl
))))
4993 flags
= ATTR_FLAG_TYPE_IN_PLACE
;
4997 /* Set attributes here so if duplicate decl, will have proper attributes. */
4998 cplus_decl_attributes (&decl
, attributes
, flags
);
5000 /* Dllimported symbols cannot be defined. Static data members (which
5001 can be initialized in-class and dllimported) go through grokfield,
5002 not here, so we don't need to exclude those decls when checking for
5004 if (initialized
&& DECL_DLLIMPORT_P (decl
))
5006 error ("definition of %q#D is marked %<dllimport%>", decl
);
5007 DECL_DLLIMPORT_P (decl
) = 0;
5010 /* If #pragma weak was used, mark the decl weak now. */
5011 if (!processing_template_decl
)
5012 maybe_apply_pragma_weak (decl
);
5014 if (TREE_CODE (decl
) == FUNCTION_DECL
5015 && DECL_DECLARED_INLINE_P (decl
)
5016 && DECL_UNINLINABLE (decl
)
5017 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl
)))
5018 warning_at (DECL_SOURCE_LOCATION (decl
), 0,
5019 "inline function %qD given attribute noinline", decl
);
5021 if (TYPE_P (context
) && COMPLETE_TYPE_P (complete_type (context
)))
5023 bool this_tmpl
= (processing_template_decl
5024 > template_class_depth (context
));
5027 tree field
= lookup_field (context
, DECL_NAME (decl
), 0, false);
5028 if (field
== NULL_TREE
5029 || !(VAR_P (field
) || variable_template_p (field
)))
5030 error ("%q+#D is not a static data member of %q#T", decl
, context
);
5031 else if (variable_template_p (field
) && !this_tmpl
)
5033 if (DECL_LANG_SPECIFIC (decl
)
5034 && DECL_TEMPLATE_SPECIALIZATION (decl
))
5035 /* OK, specialization was already checked. */;
5038 error_at (DECL_SOURCE_LOCATION (decl
),
5039 "non-member-template declaration of %qD", decl
);
5040 inform (DECL_SOURCE_LOCATION (field
), "does not match "
5041 "member template declaration here");
5042 return error_mark_node
;
5047 if (variable_template_p (field
))
5048 field
= DECL_TEMPLATE_RESULT (field
);
5050 if (DECL_CONTEXT (field
) != context
)
5052 if (!same_type_p (DECL_CONTEXT (field
), context
))
5053 permerror (input_location
, "ISO C++ does not permit %<%T::%D%> "
5054 "to be defined as %<%T::%D%>",
5055 DECL_CONTEXT (field
), DECL_NAME (decl
),
5056 context
, DECL_NAME (decl
));
5057 DECL_CONTEXT (decl
) = DECL_CONTEXT (field
);
5059 /* Static data member are tricky; an in-class initialization
5060 still doesn't provide a definition, so the in-class
5061 declaration will have DECL_EXTERNAL set, but will have an
5062 initialization. Thus, duplicate_decls won't warn
5063 about this situation, and so we check here. */
5064 if (initialized
&& DECL_INITIALIZED_IN_CLASS_P (field
))
5065 error ("duplicate initialization of %qD", decl
);
5066 field
= duplicate_decls (decl
, field
,
5067 /*newdecl_is_friend=*/false);
5068 if (field
== error_mark_node
)
5069 return error_mark_node
;
5076 tree field
= check_classfn (context
, decl
,
5078 ? current_template_parms
5080 if (field
&& field
!= error_mark_node
5081 && duplicate_decls (decl
, field
,
5082 /*newdecl_is_friend=*/false))
5086 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
5087 DECL_IN_AGGR_P (decl
) = 0;
5088 /* Do not mark DECL as an explicit specialization if it was not
5089 already marked as an instantiation; a declaration should
5090 never be marked as a specialization unless we know what
5091 template is being specialized. */
5092 if (DECL_LANG_SPECIFIC (decl
) && DECL_USE_TEMPLATE (decl
))
5094 SET_DECL_TEMPLATE_SPECIALIZATION (decl
);
5095 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5096 DECL_COMDAT (decl
) = (TREE_PUBLIC (decl
)
5097 && DECL_DECLARED_INLINE_P (decl
));
5099 DECL_COMDAT (decl
) = false;
5101 /* [temp.expl.spec] An explicit specialization of a static data
5102 member of a template is a definition if the declaration
5103 includes an initializer; otherwise, it is a declaration.
5105 We check for processing_specialization so this only applies
5106 to the new specialization syntax. */
5107 if (!initialized
&& processing_specialization
)
5108 DECL_EXTERNAL (decl
) = 1;
5111 if (DECL_EXTERNAL (decl
) && ! DECL_TEMPLATE_SPECIALIZATION (decl
)
5112 /* Aliases are definitions. */
5114 permerror (input_location
, "declaration of %q#D outside of class is not definition",
5118 was_public
= TREE_PUBLIC (decl
);
5120 /* Enter this declaration into the symbol table. Don't push the plain
5121 VAR_DECL for a variable template. */
5122 if (!template_parm_scope_p ()
5124 decl
= maybe_push_decl (decl
);
5126 if (processing_template_decl
)
5127 decl
= push_template_decl (decl
);
5128 if (decl
== error_mark_node
)
5129 return error_mark_node
;
5132 && DECL_NAMESPACE_SCOPE_P (decl
) && !TREE_PUBLIC (decl
) && !was_public
5133 && !DECL_THIS_STATIC (decl
) && !DECL_ARTIFICIAL (decl
))
5135 /* This is a const variable with implicit 'static'. Set
5136 DECL_THIS_STATIC so we can tell it from variables that are
5137 !TREE_PUBLIC because of the anonymous namespace. */
5138 gcc_assert (CP_TYPE_CONST_P (TREE_TYPE (decl
)) || errorcount
);
5139 DECL_THIS_STATIC (decl
) = 1;
5142 if (current_function_decl
&& VAR_P (decl
)
5143 && DECL_DECLARED_CONSTEXPR_P (current_function_decl
))
5146 if (CP_DECL_THREAD_LOCAL_P (decl
))
5147 error ("%qD declared %<thread_local%> in %<constexpr%> function",
5149 else if (TREE_STATIC (decl
))
5150 error ("%qD declared %<static%> in %<constexpr%> function", decl
);
5154 cp_function_chain
->invalid_constexpr
= true;
5157 if (!processing_template_decl
&& VAR_P (decl
))
5158 start_decl_1 (decl
, initialized
);
5163 /* Process the declaration of a variable DECL. INITIALIZED is true
5164 iff DECL is explicitly initialized. (INITIALIZED is false if the
5165 variable is initialized via an implicitly-called constructor.)
5166 This function must be called for ordinary variables (including, for
5167 example, implicit instantiations of templates), but must not be
5168 called for template declarations. */
5171 start_decl_1 (tree decl
, bool initialized
)
5175 bool aggregate_definition_p
;
5177 gcc_assert (!processing_template_decl
);
5179 if (error_operand_p (decl
))
5182 gcc_assert (VAR_P (decl
));
5184 type
= TREE_TYPE (decl
);
5185 complete_p
= COMPLETE_TYPE_P (type
);
5186 aggregate_definition_p
= MAYBE_CLASS_TYPE_P (type
) && !DECL_EXTERNAL (decl
);
5188 /* If an explicit initializer is present, or if this is a definition
5189 of an aggregate, then we need a complete type at this point.
5190 (Scalars are always complete types, so there is nothing to
5191 check.) This code just sets COMPLETE_P; errors (if necessary)
5192 are issued below. */
5193 if ((initialized
|| aggregate_definition_p
)
5195 && COMPLETE_TYPE_P (complete_type (type
)))
5198 /* We will not yet have set TREE_READONLY on DECL if the type
5199 was "const", but incomplete, before this point. But, now, we
5200 have a complete type, so we can try again. */
5201 cp_apply_type_quals_to_decl (cp_type_quals (type
), decl
);
5205 /* Is it valid for this decl to have an initializer at all? */
5207 /* Don't allow initializations for incomplete types except for
5208 arrays which might be completed by the initialization. */
5210 ; /* A complete type is ok. */
5211 else if (type_uses_auto (type
))
5212 ; /* An auto type is ok. */
5213 else if (TREE_CODE (type
) != ARRAY_TYPE
)
5215 error ("variable %q#D has initializer but incomplete type", decl
);
5216 type
= TREE_TYPE (decl
) = error_mark_node
;
5218 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type
))))
5220 if (DECL_LANG_SPECIFIC (decl
) && DECL_TEMPLATE_INFO (decl
))
5221 error ("elements of array %q#D have incomplete type", decl
);
5222 /* else we already gave an error in start_decl. */
5225 else if (aggregate_definition_p
&& !complete_p
)
5227 if (type_uses_auto (type
))
5228 gcc_assert (CLASS_PLACEHOLDER_TEMPLATE (type
));
5231 error ("aggregate %q#D has incomplete type and cannot be defined",
5233 /* Change the type so that assemble_variable will give
5234 DECL an rtl we can live with: (mem (const_int 0)). */
5235 type
= TREE_TYPE (decl
) = error_mark_node
;
5239 /* Create a new scope to hold this declaration if necessary.
5240 Whether or not a new scope is necessary cannot be determined
5241 until after the type has been completed; if the type is a
5242 specialization of a class template it is not until after
5243 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
5244 will be set correctly. */
5245 maybe_push_cleanup_level (type
);
5248 /* Handle initialization of references. DECL, TYPE, and INIT have the
5249 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
5250 but will be set to a new CLEANUP_STMT if a temporary is created
5251 that must be destroyed subsequently.
5253 Returns an initializer expression to use to initialize DECL, or
5254 NULL if the initialization can be performed statically.
5256 Quotes on semantics can be found in ARM 8.4.3. */
5259 grok_reference_init (tree decl
, tree type
, tree init
, int flags
)
5261 if (init
== NULL_TREE
)
5263 if ((DECL_LANG_SPECIFIC (decl
) == 0
5264 || DECL_IN_AGGR_P (decl
) == 0)
5265 && ! DECL_THIS_EXTERN (decl
))
5266 error ("%qD declared as reference but not initialized", decl
);
5270 if (TREE_CODE (init
) == TREE_LIST
)
5271 init
= build_x_compound_expr_from_list (init
, ELK_INIT
,
5272 tf_warning_or_error
);
5274 tree ttype
= TREE_TYPE (type
);
5275 if (TREE_CODE (ttype
) != ARRAY_TYPE
5276 && TREE_CODE (TREE_TYPE (init
)) == ARRAY_TYPE
)
5277 /* Note: default conversion is only called in very special cases. */
5278 init
= decay_conversion (init
, tf_warning_or_error
);
5280 /* check_initializer handles this for non-reference variables, but for
5281 references we need to do it here or the initializer will get the
5282 incomplete array type and confuse later calls to
5283 cp_complete_array_type. */
5284 if (TREE_CODE (ttype
) == ARRAY_TYPE
5285 && TYPE_DOMAIN (ttype
) == NULL_TREE
5286 && (BRACE_ENCLOSED_INITIALIZER_P (init
)
5287 || TREE_CODE (init
) == STRING_CST
))
5289 cp_complete_array_type (&ttype
, init
, false);
5290 if (ttype
!= TREE_TYPE (type
))
5291 type
= cp_build_reference_type (ttype
, TYPE_REF_IS_RVALUE (type
));
5294 /* Convert INIT to the reference type TYPE. This may involve the
5295 creation of a temporary, whose lifetime must be the same as that
5296 of the reference. If so, a DECL_EXPR for the temporary will be
5297 added just after the DECL_EXPR for DECL. That's why we don't set
5298 DECL_INITIAL for local references (instead assigning to them
5299 explicitly); we need to allow the temporary to be initialized
5301 return initialize_reference (type
, init
, flags
,
5302 tf_warning_or_error
);
5305 /* Designated initializers in arrays are not supported in GNU C++.
5306 The parser cannot detect this error since it does not know whether
5307 a given brace-enclosed initializer is for a class type or for an
5308 array. This function checks that CE does not use a designated
5309 initializer. If it does, an error is issued. Returns true if CE
5310 is valid, i.e., does not have a designated initializer. */
5313 check_array_designated_initializer (constructor_elt
*ce
,
5314 unsigned HOST_WIDE_INT index
)
5316 /* Designated initializers for array elements are not supported. */
5319 /* The parser only allows identifiers as designated
5321 if (ce
->index
== error_mark_node
)
5323 error ("name used in a GNU-style designated "
5324 "initializer for an array");
5327 else if (identifier_p (ce
->index
))
5329 error ("name %qD used in a GNU-style designated "
5330 "initializer for an array", ce
->index
);
5334 tree ce_index
= build_expr_type_conversion (WANT_INT
| WANT_ENUM
,
5337 && INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (ce_index
))
5338 && (TREE_CODE (ce_index
= maybe_constant_value (ce_index
))
5341 /* A C99 designator is OK if it matches the current index. */
5342 if (wi::to_wide (ce_index
) == index
)
5345 sorry ("non-trivial designated initializers not supported");
5348 error ("C99 designator %qE is not an integral constant-expression",
5357 /* When parsing `int a[] = {1, 2};' we don't know the size of the
5358 array until we finish parsing the initializer. If that's the
5359 situation we're in, update DECL accordingly. */
5362 maybe_deduce_size_from_array_init (tree decl
, tree init
)
5364 tree type
= TREE_TYPE (decl
);
5366 if (TREE_CODE (type
) == ARRAY_TYPE
5367 && TYPE_DOMAIN (type
) == NULL_TREE
5368 && TREE_CODE (decl
) != TYPE_DECL
)
5370 /* do_default is really a C-ism to deal with tentative definitions.
5371 But let's leave it here to ease the eventual merge. */
5372 int do_default
= !DECL_EXTERNAL (decl
);
5373 tree initializer
= init
? init
: DECL_INITIAL (decl
);
5376 /* Check that there are no designated initializers in INIT, as
5377 those are not supported in GNU C++, and as the middle-end
5378 will crash if presented with a non-numeric designated
5380 if (initializer
&& BRACE_ENCLOSED_INITIALIZER_P (initializer
))
5382 vec
<constructor_elt
, va_gc
> *v
= CONSTRUCTOR_ELTS (initializer
);
5383 constructor_elt
*ce
;
5385 FOR_EACH_VEC_SAFE_ELT (v
, i
, ce
)
5386 if (!check_array_designated_initializer (ce
, i
))
5392 failure
= cp_complete_array_type (&TREE_TYPE (decl
), initializer
,
5396 error_at (EXPR_LOC_OR_LOC (initializer
,
5397 DECL_SOURCE_LOCATION (decl
)),
5398 "initializer fails to determine size of %qD", decl
);
5400 else if (failure
== 2)
5404 error_at (DECL_SOURCE_LOCATION (decl
),
5405 "array size missing in %qD", decl
);
5407 /* If a `static' var's size isn't known, make it extern as
5408 well as static, so it does not get allocated. If it's not
5409 `static', then don't mark it extern; finish_incomplete_decl
5410 will give it a default size and it will get allocated. */
5411 else if (!pedantic
&& TREE_STATIC (decl
) && !TREE_PUBLIC (decl
))
5412 DECL_EXTERNAL (decl
) = 1;
5414 else if (failure
== 3)
5416 error_at (DECL_SOURCE_LOCATION (decl
),
5417 "zero-size array %qD", decl
);
5421 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl
)), decl
);
5423 relayout_decl (decl
);
5427 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
5428 any appropriate error messages regarding the layout. */
5431 layout_var_decl (tree decl
)
5435 type
= TREE_TYPE (decl
);
5436 if (type
== error_mark_node
)
5439 /* If we haven't already laid out this declaration, do so now.
5440 Note that we must not call complete type for an external object
5441 because it's type might involve templates that we are not
5442 supposed to instantiate yet. (And it's perfectly valid to say
5443 `extern X x' for some incomplete type `X'.) */
5444 if (!DECL_EXTERNAL (decl
))
5445 complete_type (type
);
5446 if (!DECL_SIZE (decl
)
5447 && TREE_TYPE (decl
) != error_mark_node
5448 && complete_or_array_type_p (type
))
5449 layout_decl (decl
, 0);
5451 if (!DECL_EXTERNAL (decl
) && DECL_SIZE (decl
) == NULL_TREE
)
5453 /* An automatic variable with an incomplete type: that is an error.
5454 Don't talk about array types here, since we took care of that
5455 message in grokdeclarator. */
5456 error_at (DECL_SOURCE_LOCATION (decl
),
5457 "storage size of %qD isn%'t known", decl
);
5458 TREE_TYPE (decl
) = error_mark_node
;
5461 /* Keep this code around in case we later want to control debug info
5462 based on whether a type is "used". (jason 1999-11-11) */
5464 else if (!DECL_EXTERNAL (decl
) && MAYBE_CLASS_TYPE_P (ttype
))
5465 /* Let debugger know it should output info for this type. */
5466 note_debug_info_needed (ttype
);
5468 if (TREE_STATIC (decl
) && DECL_CLASS_SCOPE_P (decl
))
5469 note_debug_info_needed (DECL_CONTEXT (decl
));
5472 if ((DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
5473 && DECL_SIZE (decl
) != NULL_TREE
5474 && ! TREE_CONSTANT (DECL_SIZE (decl
)))
5476 if (TREE_CODE (DECL_SIZE (decl
)) == INTEGER_CST
)
5477 constant_expression_warning (DECL_SIZE (decl
));
5480 error_at (DECL_SOURCE_LOCATION (decl
),
5481 "storage size of %qD isn%'t constant", decl
);
5482 TREE_TYPE (decl
) = error_mark_node
;
5487 /* If a local static variable is declared in an inline function, or if
5488 we have a weak definition, we must endeavor to create only one
5489 instance of the variable at link-time. */
5492 maybe_commonize_var (tree decl
)
5494 /* Static data in a function with comdat linkage also has comdat
5496 if ((TREE_STATIC (decl
)
5497 /* Don't mess with __FUNCTION__. */
5498 && ! DECL_ARTIFICIAL (decl
)
5499 && DECL_FUNCTION_SCOPE_P (decl
)
5500 && vague_linkage_p (DECL_CONTEXT (decl
)))
5501 || (TREE_PUBLIC (decl
) && DECL_INLINE_VAR_P (decl
)))
5505 /* With weak symbols, we simply make the variable COMDAT;
5506 that will cause copies in multiple translations units to
5508 comdat_linkage (decl
);
5512 if (DECL_INITIAL (decl
) == NULL_TREE
5513 || DECL_INITIAL (decl
) == error_mark_node
)
5515 /* Without weak symbols, we can use COMMON to merge
5516 uninitialized variables. */
5517 TREE_PUBLIC (decl
) = 1;
5518 DECL_COMMON (decl
) = 1;
5522 /* While for initialized variables, we must use internal
5523 linkage -- which means that multiple copies will not
5525 TREE_PUBLIC (decl
) = 0;
5526 DECL_COMMON (decl
) = 0;
5528 if (DECL_INLINE_VAR_P (decl
))
5529 msg
= G_("sorry: semantics of inline variable "
5530 "%q#D are wrong (you%'ll wind up with "
5531 "multiple copies)");
5533 msg
= G_("sorry: semantics of inline function "
5534 "static data %q#D are wrong (you%'ll wind "
5535 "up with multiple copies)");
5536 if (warning_at (DECL_SOURCE_LOCATION (decl
), 0,
5538 inform (DECL_SOURCE_LOCATION (decl
),
5539 "you can work around this by removing the initializer");
5545 /* Issue an error message if DECL is an uninitialized const variable.
5546 CONSTEXPR_CONTEXT_P is true when the function is called in a constexpr
5547 context from potential_constant_expression. Returns true if all is well,
5551 check_for_uninitialized_const_var (tree decl
, bool constexpr_context_p
,
5552 tsubst_flags_t complain
)
5554 tree type
= strip_array_types (TREE_TYPE (decl
));
5556 /* ``Unless explicitly declared extern, a const object does not have
5557 external linkage and must be initialized. ($8.4; $12.1)'' ARM
5560 && TREE_CODE (type
) != REFERENCE_TYPE
5561 && (constexpr_context_p
5562 || CP_TYPE_CONST_P (type
) || var_in_constexpr_fn (decl
))
5563 && !DECL_NONTRIVIALLY_INITIALIZED_P (decl
))
5565 tree field
= default_init_uninitialized_part (type
);
5569 if (!constexpr_context_p
)
5571 if (CP_TYPE_CONST_P (type
))
5573 if (complain
& tf_error
)
5574 permerror (DECL_SOURCE_LOCATION (decl
),
5575 "uninitialized const %qD", decl
);
5579 if (!is_instantiation_of_constexpr (current_function_decl
)
5580 && (complain
& tf_error
))
5581 error_at (DECL_SOURCE_LOCATION (decl
),
5582 "uninitialized variable %qD in %<constexpr%> "
5584 cp_function_chain
->invalid_constexpr
= true;
5587 else if (complain
& tf_error
)
5588 error_at (DECL_SOURCE_LOCATION (decl
),
5589 "uninitialized variable %qD in %<constexpr%> context",
5592 if (CLASS_TYPE_P (type
) && (complain
& tf_error
))
5594 tree defaulted_ctor
;
5596 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (type
)),
5597 "%q#T has no user-provided default constructor", type
);
5598 defaulted_ctor
= in_class_defaulted_default_constructor (type
);
5600 inform (DECL_SOURCE_LOCATION (defaulted_ctor
),
5601 "constructor is not user-provided because it is "
5602 "explicitly defaulted in the class body");
5603 inform (DECL_SOURCE_LOCATION (field
),
5604 "and the implicitly-defined constructor does not "
5605 "initialize %q#D", field
);
5614 /* Structure holding the current initializer being processed by reshape_init.
5615 CUR is a pointer to the current element being processed, END is a pointer
5616 after the last element present in the initializer. */
5619 constructor_elt
*cur
;
5620 constructor_elt
*end
;
5623 static tree
reshape_init_r (tree
, reshape_iter
*, bool, tsubst_flags_t
);
5625 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
5626 returned is the next FIELD_DECL (possibly FIELD itself) that can be
5627 initialized. If there are no more such fields, the return value
5631 next_initializable_field (tree field
)
5634 && (TREE_CODE (field
) != FIELD_DECL
5635 || DECL_UNNAMED_BIT_FIELD (field
)
5636 || (DECL_ARTIFICIAL (field
)
5637 && !(cxx_dialect
>= cxx17
&& DECL_FIELD_IS_BASE (field
)))))
5638 field
= DECL_CHAIN (field
);
5643 /* Return true for [dcl.init.list] direct-list-initialization from
5644 single element of enumeration with a fixed underlying type. */
5647 is_direct_enum_init (tree type
, tree init
)
5649 if (cxx_dialect
>= cxx17
5650 && TREE_CODE (type
) == ENUMERAL_TYPE
5651 && ENUM_FIXED_UNDERLYING_TYPE_P (type
)
5652 && TREE_CODE (init
) == CONSTRUCTOR
5653 && CONSTRUCTOR_IS_DIRECT_INIT (init
)
5654 && CONSTRUCTOR_NELTS (init
) == 1)
5659 /* Subroutine of reshape_init_array and reshape_init_vector, which does
5660 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
5661 INTEGER_CST representing the size of the array minus one (the maximum index),
5662 or NULL_TREE if the array was declared without specifying the size. D is
5663 the iterator within the constructor. */
5666 reshape_init_array_1 (tree elt_type
, tree max_index
, reshape_iter
*d
,
5667 tsubst_flags_t complain
)
5670 bool sized_array_p
= (max_index
&& TREE_CONSTANT (max_index
));
5671 unsigned HOST_WIDE_INT max_index_cst
= 0;
5672 unsigned HOST_WIDE_INT index
;
5674 /* The initializer for an array is always a CONSTRUCTOR. */
5675 new_init
= build_constructor (init_list_type_node
, NULL
);
5679 /* Minus 1 is used for zero sized arrays. */
5680 if (integer_all_onesp (max_index
))
5683 if (tree_fits_uhwi_p (max_index
))
5684 max_index_cst
= tree_to_uhwi (max_index
);
5685 /* sizetype is sign extended, not zero extended. */
5687 max_index_cst
= tree_to_uhwi (fold_convert (size_type_node
, max_index
));
5690 /* Loop until there are no more initializers. */
5692 d
->cur
!= d
->end
&& (!sized_array_p
|| index
<= max_index_cst
);
5696 constructor_elt
*old_cur
= d
->cur
;
5698 check_array_designated_initializer (d
->cur
, index
);
5699 elt_init
= reshape_init_r (elt_type
, d
, /*first_initializer_p=*/false,
5701 if (elt_init
== error_mark_node
)
5702 return error_mark_node
;
5703 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init
),
5704 size_int (index
), elt_init
);
5705 if (!TREE_CONSTANT (elt_init
))
5706 TREE_CONSTANT (new_init
) = false;
5708 /* This can happen with an invalid initializer (c++/54501). */
5709 if (d
->cur
== old_cur
&& !sized_array_p
)
5716 /* Subroutine of reshape_init_r, processes the initializers for arrays.
5717 Parameters are the same of reshape_init_r. */
5720 reshape_init_array (tree type
, reshape_iter
*d
, tsubst_flags_t complain
)
5722 tree max_index
= NULL_TREE
;
5724 gcc_assert (TREE_CODE (type
) == ARRAY_TYPE
);
5726 if (TYPE_DOMAIN (type
))
5727 max_index
= array_type_nelts (type
);
5729 return reshape_init_array_1 (TREE_TYPE (type
), max_index
, d
, complain
);
5732 /* Subroutine of reshape_init_r, processes the initializers for vectors.
5733 Parameters are the same of reshape_init_r. */
5736 reshape_init_vector (tree type
, reshape_iter
*d
, tsubst_flags_t complain
)
5738 tree max_index
= NULL_TREE
;
5740 gcc_assert (VECTOR_TYPE_P (type
));
5742 if (COMPOUND_LITERAL_P (d
->cur
->value
))
5744 tree value
= d
->cur
->value
;
5745 if (!same_type_p (TREE_TYPE (value
), type
))
5747 if (complain
& tf_error
)
5748 error ("invalid type %qT as initializer for a vector of type %qT",
5749 TREE_TYPE (d
->cur
->value
), type
);
5750 value
= error_mark_node
;
5756 /* For a vector, we initialize it as an array of the appropriate size. */
5757 if (VECTOR_TYPE_P (type
))
5758 max_index
= size_int (TYPE_VECTOR_SUBPARTS (type
) - 1);
5760 return reshape_init_array_1 (TREE_TYPE (type
), max_index
, d
, complain
);
5763 /* Subroutine of reshape_init_r, processes the initializers for classes
5764 or union. Parameters are the same of reshape_init_r. */
5767 reshape_init_class (tree type
, reshape_iter
*d
, bool first_initializer_p
,
5768 tsubst_flags_t complain
)
5773 gcc_assert (CLASS_TYPE_P (type
));
5775 /* The initializer for a class is always a CONSTRUCTOR. */
5776 new_init
= build_constructor (init_list_type_node
, NULL
);
5777 field
= next_initializable_field (TYPE_FIELDS (type
));
5783 An initializer for an aggregate member that is an
5784 empty class shall have the form of an empty
5785 initializer-list {}. */
5786 if (!first_initializer_p
)
5788 if (complain
& tf_error
)
5789 error ("initializer for %qT must be brace-enclosed", type
);
5790 return error_mark_node
;
5795 /* Loop through the initializable fields, gathering initializers. */
5796 while (d
->cur
!= d
->end
)
5799 constructor_elt
*old_cur
= d
->cur
;
5801 /* Handle designated initializers, as an extension. */
5804 if (d
->cur
->index
== error_mark_node
)
5805 return error_mark_node
;
5807 if (TREE_CODE (d
->cur
->index
) == FIELD_DECL
)
5808 /* We already reshaped this. */
5809 gcc_assert (d
->cur
->index
== field
);
5810 else if (TREE_CODE (d
->cur
->index
) == IDENTIFIER_NODE
)
5811 field
= get_class_binding (type
, d
->cur
->index
, false);
5814 if (complain
& tf_error
)
5815 error ("%<[%E] =%> used in a GNU-style designated initializer"
5816 " for class %qT", d
->cur
->index
, type
);
5817 return error_mark_node
;
5820 if (!field
|| TREE_CODE (field
) != FIELD_DECL
)
5822 if (complain
& tf_error
)
5823 error ("%qT has no non-static data member named %qD", type
,
5825 return error_mark_node
;
5829 /* If we processed all the member of the class, we are done. */
5833 field_init
= reshape_init_r (TREE_TYPE (field
), d
,
5834 /*first_initializer_p=*/false, complain
);
5835 if (field_init
== error_mark_node
)
5836 return error_mark_node
;
5838 if (d
->cur
== old_cur
&& d
->cur
->index
)
5840 /* This can happen with an invalid initializer for a flexible
5841 array member (c++/54441). */
5842 if (complain
& tf_error
)
5843 error ("invalid initializer for %q#D", field
);
5844 return error_mark_node
;
5847 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init
), field
, field_init
);
5851 When a union is initialized with a brace-enclosed
5852 initializer, the braces shall only contain an
5853 initializer for the first member of the union. */
5854 if (TREE_CODE (type
) == UNION_TYPE
)
5857 field
= next_initializable_field (DECL_CHAIN (field
));
5863 /* Subroutine of reshape_init_r. We're in a context where C99 initializer
5864 designators are not valid; either complain or return true to indicate
5865 that reshape_init_r should return error_mark_node. */
5868 has_designator_problem (reshape_iter
*d
, tsubst_flags_t complain
)
5872 if (complain
& tf_error
)
5873 error ("C99 designator %qE outside aggregate initializer",
5881 /* Subroutine of reshape_init, which processes a single initializer (part of
5882 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
5883 iterator within the CONSTRUCTOR which points to the initializer to process.
5884 FIRST_INITIALIZER_P is true if this is the first initializer of the
5885 outermost CONSTRUCTOR node. */
5888 reshape_init_r (tree type
, reshape_iter
*d
, bool first_initializer_p
,
5889 tsubst_flags_t complain
)
5891 tree init
= d
->cur
->value
;
5893 if (error_operand_p (init
))
5894 return error_mark_node
;
5896 if (first_initializer_p
&& !CP_AGGREGATE_TYPE_P (type
)
5897 && has_designator_problem (d
, complain
))
5898 return error_mark_node
;
5900 if (TREE_CODE (type
) == COMPLEX_TYPE
)
5902 /* A complex type can be initialized from one or two initializers,
5903 but braces are not elided. */
5905 if (BRACE_ENCLOSED_INITIALIZER_P (init
))
5907 if (CONSTRUCTOR_NELTS (init
) > 2)
5909 if (complain
& tf_error
)
5910 error ("too many initializers for %qT", type
);
5912 return error_mark_node
;
5915 else if (first_initializer_p
&& d
->cur
!= d
->end
)
5917 vec
<constructor_elt
, va_gc
> *v
= 0;
5918 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, init
);
5919 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, d
->cur
->value
);
5920 if (has_designator_problem (d
, complain
))
5921 return error_mark_node
;
5923 init
= build_constructor (init_list_type_node
, v
);
5928 /* A non-aggregate type is always initialized with a single
5930 if (!CP_AGGREGATE_TYPE_P (type
))
5932 /* It is invalid to initialize a non-aggregate type with a
5933 brace-enclosed initializer before C++0x.
5934 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
5935 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
5936 a CONSTRUCTOR (with a record type). */
5937 if (TREE_CODE (init
) == CONSTRUCTOR
5938 /* Don't complain about a capture-init. */
5939 && !CONSTRUCTOR_IS_DIRECT_INIT (init
)
5940 && BRACE_ENCLOSED_INITIALIZER_P (init
)) /* p7626.C */
5942 if (SCALAR_TYPE_P (type
))
5944 if (cxx_dialect
< cxx11
5945 /* Isn't value-initialization. */
5946 || CONSTRUCTOR_NELTS (init
) > 0)
5948 if (complain
& tf_error
)
5949 error ("braces around scalar initializer for type %qT",
5951 init
= error_mark_node
;
5955 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS
);
5962 /* "If T is a class type and the initializer list has a single element of
5963 type cv U, where U is T or a class derived from T, the object is
5964 initialized from that element." Even if T is an aggregate. */
5965 if (cxx_dialect
>= cxx11
&& (CLASS_TYPE_P (type
) || VECTOR_TYPE_P (type
))
5966 && first_initializer_p
5967 && d
->end
- d
->cur
== 1
5968 && reference_related_p (type
, TREE_TYPE (init
)))
5976 All implicit type conversions (clause _conv_) are considered when
5977 initializing the aggregate member with an initializer from an
5978 initializer-list. If the initializer can initialize a member,
5979 the member is initialized. Otherwise, if the member is itself a
5980 non-empty subaggregate, brace elision is assumed and the
5981 initializer is considered for the initialization of the first
5982 member of the subaggregate. */
5983 if (TREE_CODE (init
) != CONSTRUCTOR
5984 /* But don't try this for the first initializer, since that would be
5985 looking through the outermost braces; A a2 = { a1 }; is not a
5986 valid aggregate initialization. */
5987 && !first_initializer_p
5988 && (same_type_ignoring_top_level_qualifiers_p (type
, TREE_TYPE (init
))
5989 || can_convert_arg (type
, TREE_TYPE (init
), init
, LOOKUP_NORMAL
,
5996 /* [dcl.init.string]
5998 A char array (whether plain char, signed char, or unsigned char)
5999 can be initialized by a string-literal (optionally enclosed in
6000 braces); a wchar_t array can be initialized by a wide
6001 string-literal (optionally enclosed in braces). */
6002 if (TREE_CODE (type
) == ARRAY_TYPE
6003 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type
))))
6005 tree str_init
= init
;
6007 /* Strip one level of braces if and only if they enclose a single
6008 element (as allowed by [dcl.init.string]). */
6009 if (!first_initializer_p
6010 && TREE_CODE (str_init
) == CONSTRUCTOR
6011 && CONSTRUCTOR_NELTS (str_init
) == 1)
6013 str_init
= (*CONSTRUCTOR_ELTS (str_init
))[0].value
;
6016 /* If it's a string literal, then it's the initializer for the array
6017 as a whole. Otherwise, continue with normal initialization for
6018 array types (one value per array element). */
6019 if (TREE_CODE (str_init
) == STRING_CST
)
6021 if (has_designator_problem (d
, complain
))
6022 return error_mark_node
;
6028 /* The following cases are about aggregates. If we are not within a full
6029 initializer already, and there is not a CONSTRUCTOR, it means that there
6030 is a missing set of braces (that is, we are processing the case for
6031 which reshape_init exists). */
6032 if (!first_initializer_p
)
6034 if (TREE_CODE (init
) == CONSTRUCTOR
)
6036 if (TREE_TYPE (init
) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init
)))
6037 /* There is no need to reshape pointer-to-member function
6038 initializers, as they are always constructed correctly
6039 by the front end. */
6041 else if (COMPOUND_LITERAL_P (init
))
6042 /* For a nested compound literal, there is no need to reshape since
6043 brace elision is not allowed. Even if we decided to allow it,
6044 we should add a call to reshape_init in finish_compound_literal,
6045 before calling digest_init, so changing this code would still
6046 not be necessary. */
6047 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init
));
6051 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init
));
6052 return reshape_init (type
, init
, complain
);
6056 if (complain
& tf_warning
)
6057 warning (OPT_Wmissing_braces
,
6058 "missing braces around initializer for %qT",
6062 /* Dispatch to specialized routines. */
6063 if (CLASS_TYPE_P (type
))
6064 return reshape_init_class (type
, d
, first_initializer_p
, complain
);
6065 else if (TREE_CODE (type
) == ARRAY_TYPE
)
6066 return reshape_init_array (type
, d
, complain
);
6067 else if (VECTOR_TYPE_P (type
))
6068 return reshape_init_vector (type
, d
, complain
);
6073 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
6074 brace-enclosed aggregate initializer.
6076 INIT is the CONSTRUCTOR containing the list of initializers describing
6077 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
6078 It may not presently match the shape of the TYPE; for example:
6080 struct S { int a; int b; };
6081 struct S a[] = { 1, 2, 3, 4 };
6083 Here INIT will hold a vector of four elements, rather than a
6084 vector of two elements, each itself a vector of two elements. This
6085 routine transforms INIT from the former form into the latter. The
6086 revised CONSTRUCTOR node is returned. */
6089 reshape_init (tree type
, tree init
, tsubst_flags_t complain
)
6091 vec
<constructor_elt
, va_gc
> *v
;
6095 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init
));
6097 v
= CONSTRUCTOR_ELTS (init
);
6099 /* An empty constructor does not need reshaping, and it is always a valid
6101 if (vec_safe_is_empty (v
))
6104 /* Handle [dcl.init.list] direct-list-initialization from
6105 single element of enumeration with a fixed underlying type. */
6106 if (is_direct_enum_init (type
, init
))
6108 tree elt
= CONSTRUCTOR_ELT (init
, 0)->value
;
6109 type
= cv_unqualified (type
);
6110 if (check_narrowing (ENUM_UNDERLYING_TYPE (type
), elt
, complain
))
6112 warning_sentinel
w (warn_useless_cast
);
6113 warning_sentinel
w2 (warn_ignored_qualifiers
);
6114 return cp_build_c_cast (type
, elt
, tf_warning_or_error
);
6117 return error_mark_node
;
6120 /* Recurse on this CONSTRUCTOR. */
6122 d
.end
= d
.cur
+ v
->length ();
6124 new_init
= reshape_init_r (type
, &d
, true, complain
);
6125 if (new_init
== error_mark_node
)
6126 return error_mark_node
;
6128 /* Make sure all the element of the constructor were used. Otherwise,
6129 issue an error about exceeding initializers. */
6132 if (complain
& tf_error
)
6133 error ("too many initializers for %qT", type
);
6134 return error_mark_node
;
6137 if (CONSTRUCTOR_IS_DIRECT_INIT (init
)
6138 && BRACE_ENCLOSED_INITIALIZER_P (new_init
))
6139 CONSTRUCTOR_IS_DIRECT_INIT (new_init
) = true;
6144 /* Verify array initializer. Returns true if errors have been reported. */
6147 check_array_initializer (tree decl
, tree type
, tree init
)
6149 tree element_type
= TREE_TYPE (type
);
6151 /* The array type itself need not be complete, because the
6152 initializer may tell us how many elements are in the array.
6153 But, the elements of the array must be complete. */
6154 if (!COMPLETE_TYPE_P (complete_type (element_type
)))
6157 error_at (DECL_SOURCE_LOCATION (decl
),
6158 "elements of array %q#D have incomplete type", decl
);
6160 error ("elements of array %q#T have incomplete type", type
);
6163 /* A compound literal can't have variable size. */
6165 && ((COMPLETE_TYPE_P (type
) && !TREE_CONSTANT (TYPE_SIZE (type
)))
6166 || !TREE_CONSTANT (TYPE_SIZE (element_type
))))
6168 error ("variable-sized compound literal");
6174 /* Subroutine of check_initializer; args are passed down from that function.
6175 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
6178 build_aggr_init_full_exprs (tree decl
, tree init
, int flags
)
6181 gcc_assert (stmts_are_full_exprs_p ());
6182 return build_aggr_init (decl
, init
, flags
, tf_warning_or_error
);
6185 /* Verify INIT (the initializer for DECL), and record the
6186 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
6187 grok_reference_init.
6189 If the return value is non-NULL, it is an expression that must be
6190 evaluated dynamically to initialize DECL. */
6193 check_initializer (tree decl
, tree init
, int flags
, vec
<tree
, va_gc
> **cleanups
)
6195 tree type
= TREE_TYPE (decl
);
6196 tree init_code
= NULL
;
6199 /* Things that are going to be initialized need to have complete
6201 TREE_TYPE (decl
) = type
= complete_type (TREE_TYPE (decl
));
6203 if (DECL_HAS_VALUE_EXPR_P (decl
))
6205 /* A variable with DECL_HAS_VALUE_EXPR_P set is just a placeholder,
6206 it doesn't have storage to be initialized. */
6207 gcc_assert (init
== NULL_TREE
);
6211 if (type
== error_mark_node
)
6212 /* We will have already complained. */
6215 if (TREE_CODE (type
) == ARRAY_TYPE
)
6217 if (check_array_initializer (decl
, type
, init
))
6220 else if (!COMPLETE_TYPE_P (type
))
6222 error_at (DECL_SOURCE_LOCATION (decl
),
6223 "%q#D has incomplete type", decl
);
6224 TREE_TYPE (decl
) = error_mark_node
;
6228 /* There is no way to make a variable-sized class type in GNU C++. */
6229 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type
)));
6231 if (init
&& BRACE_ENCLOSED_INITIALIZER_P (init
))
6233 int init_len
= CONSTRUCTOR_NELTS (init
);
6234 if (SCALAR_TYPE_P (type
))
6238 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS
);
6239 init
= build_zero_init (type
, NULL_TREE
, false);
6241 else if (init_len
!= 1 && TREE_CODE (type
) != COMPLEX_TYPE
)
6243 error_at (EXPR_LOC_OR_LOC (init
, DECL_SOURCE_LOCATION (decl
)),
6244 "scalar object %qD requires one element in "
6245 "initializer", decl
);
6246 TREE_TYPE (decl
) = error_mark_node
;
6252 if (TREE_CODE (decl
) == CONST_DECL
)
6254 gcc_assert (TREE_CODE (type
) != REFERENCE_TYPE
);
6256 DECL_INITIAL (decl
) = init
;
6258 gcc_assert (init
!= NULL_TREE
);
6261 else if (!init
&& DECL_REALLY_EXTERN (decl
))
6263 else if (init
|| type_build_ctor_call (type
)
6264 || TREE_CODE (type
) == REFERENCE_TYPE
)
6266 if (TREE_CODE (type
) == REFERENCE_TYPE
)
6268 init
= grok_reference_init (decl
, type
, init
, flags
);
6269 flags
|= LOOKUP_ALREADY_DIGESTED
;
6272 check_for_uninitialized_const_var (decl
, /*constexpr_context_p=*/false,
6273 tf_warning_or_error
);
6274 /* Do not reshape constructors of vectors (they don't need to be
6276 else if (BRACE_ENCLOSED_INITIALIZER_P (init
))
6278 if (is_std_init_list (type
))
6280 init
= perform_implicit_conversion (type
, init
,
6281 tf_warning_or_error
);
6282 flags
|= LOOKUP_ALREADY_DIGESTED
;
6284 else if (TYPE_NON_AGGREGATE_CLASS (type
))
6286 /* Don't reshape if the class has constructors. */
6287 if (cxx_dialect
== cxx98
)
6288 error_at (EXPR_LOC_OR_LOC (init
, DECL_SOURCE_LOCATION (decl
)),
6289 "in C++98 %qD must be initialized by "
6290 "constructor, not by %<{...}%>",
6293 else if (VECTOR_TYPE_P (type
) && TYPE_VECTOR_OPAQUE (type
))
6295 error ("opaque vector types cannot be initialized");
6296 init
= error_mark_node
;
6300 init
= reshape_init (type
, init
, tf_warning_or_error
);
6301 flags
|= LOOKUP_NO_NARROWING
;
6304 else if (TREE_CODE (init
) == TREE_LIST
6305 && TREE_TYPE (init
) != unknown_type_node
6306 && !MAYBE_CLASS_TYPE_P (type
))
6308 gcc_assert (TREE_CODE (decl
) != RESULT_DECL
);
6310 /* We get here with code like `int a (2);' */
6311 init
= build_x_compound_expr_from_list (init
, ELK_INIT
,
6312 tf_warning_or_error
);
6315 /* If DECL has an array type without a specific bound, deduce the
6316 array size from the initializer. */
6317 maybe_deduce_size_from_array_init (decl
, init
);
6318 type
= TREE_TYPE (decl
);
6319 if (type
== error_mark_node
)
6322 if (((type_build_ctor_call (type
) || CLASS_TYPE_P (type
))
6323 && !(flags
& LOOKUP_ALREADY_DIGESTED
)
6324 && !(init
&& BRACE_ENCLOSED_INITIALIZER_P (init
)
6325 && CP_AGGREGATE_TYPE_P (type
)
6326 && (CLASS_TYPE_P (type
)
6327 || !TYPE_NEEDS_CONSTRUCTING (type
)
6328 || type_has_extended_temps (type
))))
6329 || (DECL_DECOMPOSITION_P (decl
) && TREE_CODE (type
) == ARRAY_TYPE
))
6331 init_code
= build_aggr_init_full_exprs (decl
, init
, flags
);
6333 /* A constructor call is a non-trivial initializer even if
6334 it isn't explicitly written. */
6335 if (TREE_SIDE_EFFECTS (init_code
))
6336 DECL_NONTRIVIALLY_INITIALIZED_P (decl
) = true;
6338 /* If this is a constexpr initializer, expand_default_init will
6339 have returned an INIT_EXPR rather than a CALL_EXPR. In that
6340 case, pull the initializer back out and pass it down into
6341 store_init_value. */
6342 while (TREE_CODE (init_code
) == EXPR_STMT
6343 || TREE_CODE (init_code
) == CONVERT_EXPR
)
6344 init_code
= TREE_OPERAND (init_code
, 0);
6345 if (TREE_CODE (init_code
) == INIT_EXPR
)
6347 init
= TREE_OPERAND (init_code
, 1);
6348 init_code
= NULL_TREE
;
6349 /* Don't call digest_init; it's unnecessary and will complain
6350 about aggregate initialization of non-aggregate classes. */
6351 flags
|= LOOKUP_ALREADY_DIGESTED
;
6353 else if (DECL_DECLARED_CONSTEXPR_P (decl
))
6355 /* Declared constexpr, but no suitable initializer; massage
6356 init appropriately so we can pass it into store_init_value
6358 if (CLASS_TYPE_P (type
)
6359 && (!init
|| TREE_CODE (init
) == TREE_LIST
))
6361 init
= build_functional_cast (type
, init
, tf_none
);
6362 if (TREE_CODE (init
) == TARGET_EXPR
)
6363 TARGET_EXPR_DIRECT_INIT_P (init
) = true;
6365 init_code
= NULL_TREE
;
6371 if (init
&& TREE_CODE (init
) != TREE_VEC
)
6373 /* In aggregate initialization of a variable, each element
6374 initialization is a full-expression because there is no
6375 enclosing expression. */
6376 gcc_assert (stmts_are_full_exprs_p ());
6378 init_code
= store_init_value (decl
, init
, cleanups
, flags
);
6380 if (pedantic
&& TREE_CODE (type
) == ARRAY_TYPE
6381 && DECL_INITIAL (decl
)
6382 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
6383 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl
)))
6384 warning_at (EXPR_LOC_OR_LOC (DECL_INITIAL (decl
),
6385 DECL_SOURCE_LOCATION (decl
)),
6386 0, "array %qD initialized by parenthesized "
6387 "string literal %qE",
6388 decl
, DECL_INITIAL (decl
));
6394 if (CLASS_TYPE_P (core_type
= strip_array_types (type
))
6395 && (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type
)
6396 || CLASSTYPE_REF_FIELDS_NEED_INIT (core_type
)))
6397 diagnose_uninitialized_cst_or_ref_member (core_type
, /*using_new=*/false,
6400 check_for_uninitialized_const_var (decl
, /*constexpr_context_p=*/false,
6401 tf_warning_or_error
);
6404 if (init
&& init
!= error_mark_node
)
6405 init_code
= build2 (INIT_EXPR
, type
, decl
, init
);
6409 /* We might have set these in cp_finish_decl. */
6410 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
) = false;
6411 TREE_CONSTANT (decl
) = false;
6415 && (DECL_IN_AGGR_P (decl
) && !DECL_VAR_DECLARED_INLINE_P (decl
)))
6417 static int explained
= 0;
6419 if (cxx_dialect
< cxx11
)
6420 error ("initializer invalid for static member with constructor");
6421 else if (cxx_dialect
< cxx17
)
6422 error ("non-constant in-class initialization invalid for static "
6423 "member %qD", decl
);
6425 error ("non-constant in-class initialization invalid for non-inline "
6426 "static member %qD", decl
);
6429 inform (input_location
,
6430 "(an out of class initialization is required)");
6439 /* If DECL is not a local variable, give it RTL. */
6442 make_rtl_for_nonlocal_decl (tree decl
, tree init
, const char* asmspec
)
6444 int toplev
= toplevel_bindings_p ();
6447 /* Set the DECL_ASSEMBLER_NAME for the object. */
6450 /* The `register' keyword, when used together with an
6451 asm-specification, indicates that the variable should be
6452 placed in a particular register. */
6453 if (VAR_P (decl
) && DECL_REGISTER (decl
))
6455 set_user_assembler_name (decl
, asmspec
);
6456 DECL_HARD_REGISTER (decl
) = 1;
6460 if (TREE_CODE (decl
) == FUNCTION_DECL
6461 && DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
)
6462 set_builtin_user_assembler_name (decl
, asmspec
);
6463 set_user_assembler_name (decl
, asmspec
);
6467 /* Handle non-variables up front. */
6470 rest_of_decl_compilation (decl
, toplev
, at_eof
);
6474 /* If we see a class member here, it should be a static data
6476 if (DECL_LANG_SPECIFIC (decl
) && DECL_IN_AGGR_P (decl
))
6478 gcc_assert (TREE_STATIC (decl
));
6479 /* An in-class declaration of a static data member should be
6480 external; it is only a declaration, and not a definition. */
6481 if (init
== NULL_TREE
)
6482 gcc_assert (DECL_EXTERNAL (decl
)
6483 || !TREE_PUBLIC (decl
)
6484 || DECL_INLINE_VAR_P (decl
));
6487 /* We don't create any RTL for local variables. */
6488 if (DECL_FUNCTION_SCOPE_P (decl
) && !TREE_STATIC (decl
))
6491 /* We defer emission of local statics until the corresponding
6492 DECL_EXPR is expanded. But with constexpr its function might never
6493 be expanded, so go ahead and tell cgraph about the variable now. */
6494 defer_p
= ((DECL_FUNCTION_SCOPE_P (decl
)
6495 && !var_in_maybe_constexpr_fn (decl
))
6496 || DECL_VIRTUAL_P (decl
));
6498 /* Defer template instantiations. */
6499 if (DECL_LANG_SPECIFIC (decl
)
6500 && DECL_IMPLICIT_INSTANTIATION (decl
))
6503 /* If we're not deferring, go ahead and assemble the variable. */
6505 rest_of_decl_compilation (decl
, toplev
, at_eof
);
6508 /* walk_tree helper for wrap_temporary_cleanups, below. */
6511 wrap_cleanups_r (tree
*stmt_p
, int *walk_subtrees
, void *data
)
6513 /* Stop at types or full-expression boundaries. */
6514 if (TYPE_P (*stmt_p
)
6515 || TREE_CODE (*stmt_p
) == CLEANUP_POINT_EXPR
)
6521 if (TREE_CODE (*stmt_p
) == TARGET_EXPR
)
6523 tree guard
= (tree
)data
;
6524 tree tcleanup
= TARGET_EXPR_CLEANUP (*stmt_p
);
6526 tcleanup
= build2 (TRY_CATCH_EXPR
, void_type_node
, tcleanup
, guard
);
6527 /* Tell honor_protect_cleanup_actions to handle this as a separate
6529 TRY_CATCH_IS_CLEANUP (tcleanup
) = 1;
6531 TARGET_EXPR_CLEANUP (*stmt_p
) = tcleanup
;
6537 /* We're initializing a local variable which has a cleanup GUARD. If there
6538 are any temporaries used in the initializer INIT of this variable, we
6539 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
6540 variable will be cleaned up properly if one of them throws.
6542 Unfortunately, there's no way to express this properly in terms of
6543 nesting, as the regions for the temporaries overlap the region for the
6544 variable itself; if there are two temporaries, the variable needs to be
6545 the first thing destroyed if either of them throws. However, we only
6546 want to run the variable's cleanup if it actually got constructed. So
6547 we need to guard the temporary cleanups with the variable's cleanup if
6548 they are run on the normal path, but not if they are run on the
6549 exceptional path. We implement this by telling
6550 honor_protect_cleanup_actions to strip the variable cleanup from the
6551 exceptional path. */
6554 wrap_temporary_cleanups (tree init
, tree guard
)
6556 cp_walk_tree_without_duplicates (&init
, wrap_cleanups_r
, (void *)guard
);
6559 /* Generate code to initialize DECL (a local variable). */
6562 initialize_local_var (tree decl
, tree init
)
6564 tree type
= TREE_TYPE (decl
);
6568 gcc_assert (VAR_P (decl
)
6569 || TREE_CODE (decl
) == RESULT_DECL
);
6570 gcc_assert (!TREE_STATIC (decl
));
6572 if (DECL_SIZE (decl
) == NULL_TREE
)
6574 /* If we used it already as memory, it must stay in memory. */
6575 DECL_INITIAL (decl
) = NULL_TREE
;
6576 TREE_ADDRESSABLE (decl
) = TREE_USED (decl
);
6580 if (type
== error_mark_node
)
6583 /* Compute and store the initial value. */
6584 already_used
= TREE_USED (decl
) || TREE_USED (type
);
6585 if (TREE_USED (type
))
6586 DECL_READ_P (decl
) = 1;
6588 /* Generate a cleanup, if necessary. */
6589 cleanup
= cxx_maybe_build_cleanup (decl
, tf_warning_or_error
);
6591 /* Perform the initialization. */
6594 tree rinit
= (TREE_CODE (init
) == INIT_EXPR
6595 ? TREE_OPERAND (init
, 1) : NULL_TREE
);
6596 if (rinit
&& !TREE_SIDE_EFFECTS (rinit
))
6598 /* Stick simple initializers in DECL_INITIAL so that
6599 -Wno-init-self works (c++/34772). */
6600 gcc_assert (TREE_OPERAND (init
, 0) == decl
);
6601 DECL_INITIAL (decl
) = rinit
;
6603 if (warn_init_self
&& TREE_CODE (type
) == REFERENCE_TYPE
)
6607 warning_at (DECL_SOURCE_LOCATION (decl
),
6609 "reference %qD is initialized with itself", decl
);
6614 int saved_stmts_are_full_exprs_p
;
6616 /* If we're only initializing a single object, guard the
6617 destructors of any temporaries used in its initializer with
6618 its destructor. This isn't right for arrays because each
6619 element initialization is a full-expression. */
6620 if (cleanup
&& TREE_CODE (type
) != ARRAY_TYPE
)
6621 wrap_temporary_cleanups (init
, cleanup
);
6623 gcc_assert (building_stmt_list_p ());
6624 saved_stmts_are_full_exprs_p
= stmts_are_full_exprs_p ();
6625 current_stmt_tree ()->stmts_are_full_exprs_p
= 1;
6626 finish_expr_stmt (init
);
6627 current_stmt_tree ()->stmts_are_full_exprs_p
=
6628 saved_stmts_are_full_exprs_p
;
6632 /* Set this to 0 so we can tell whether an aggregate which was
6633 initialized was ever used. Don't do this if it has a
6634 destructor, so we don't complain about the 'resource
6635 allocation is initialization' idiom. Now set
6636 attribute((unused)) on types so decls of that type will be
6637 marked used. (see TREE_USED, above.) */
6638 if (TYPE_NEEDS_CONSTRUCTING (type
)
6640 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type
)
6641 && DECL_NAME (decl
))
6642 TREE_USED (decl
) = 0;
6643 else if (already_used
)
6644 TREE_USED (decl
) = 1;
6647 finish_decl_cleanup (decl
, cleanup
);
6650 /* DECL is a VAR_DECL for a compiler-generated variable with static
6651 storage duration (like a virtual table) whose initializer is a
6652 compile-time constant. Initialize the variable and provide it to the
6656 initialize_artificial_var (tree decl
, vec
<constructor_elt
, va_gc
> *v
)
6659 gcc_assert (DECL_ARTIFICIAL (decl
));
6660 init
= build_constructor (TREE_TYPE (decl
), v
);
6661 gcc_assert (TREE_CODE (init
) == CONSTRUCTOR
);
6662 DECL_INITIAL (decl
) = init
;
6663 DECL_INITIALIZED_P (decl
) = 1;
6664 determine_visibility (decl
);
6665 layout_var_decl (decl
);
6666 maybe_commonize_var (decl
);
6667 make_rtl_for_nonlocal_decl (decl
, init
, /*asmspec=*/NULL
);
6670 /* INIT is the initializer for a variable, as represented by the
6671 parser. Returns true iff INIT is value-dependent. */
6674 value_dependent_init_p (tree init
)
6676 if (TREE_CODE (init
) == TREE_LIST
)
6677 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
6678 return any_value_dependent_elements_p (init
);
6679 else if (TREE_CODE (init
) == CONSTRUCTOR
)
6680 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
6682 if (dependent_type_p (TREE_TYPE (init
)))
6685 vec
<constructor_elt
, va_gc
> *elts
;
6689 elts
= CONSTRUCTOR_ELTS (init
);
6690 nelts
= vec_safe_length (elts
);
6691 for (i
= 0; i
< nelts
; ++i
)
6692 if (value_dependent_init_p ((*elts
)[i
].value
))
6696 /* It must be a simple expression, e.g., int i = 3; */
6697 return value_dependent_expression_p (init
);
6702 // Returns true if a DECL is VAR_DECL with the concept specifier.
6704 is_concept_var (tree decl
)
6706 return (VAR_P (decl
)
6707 // Not all variables have DECL_LANG_SPECIFIC.
6708 && DECL_LANG_SPECIFIC (decl
)
6709 && DECL_DECLARED_CONCEPT_P (decl
));
6712 /* A helper function to be called via walk_tree. If any label exists
6713 under *TP, it is (going to be) forced. Set has_forced_label_in_static. */
6716 notice_forced_label_r (tree
*tp
, int *walk_subtrees
, void *)
6720 if (TREE_CODE (*tp
) == LABEL_DECL
)
6721 cfun
->has_forced_label_in_static
= 1;
6725 /* Finish processing of a declaration;
6726 install its line number and initial value.
6727 If the length of an array type is not known before,
6728 it must be determined now, from the initial value, or it is an error.
6730 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
6731 true, then INIT is an integral constant expression.
6733 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
6734 if the (init) syntax was used. */
6737 cp_finish_decl (tree decl
, tree init
, bool init_const_expr_p
,
6738 tree asmspec_tree
, int flags
)
6741 vec
<tree
, va_gc
> *cleanups
= NULL
;
6742 const char *asmspec
= NULL
;
6743 int was_readonly
= 0;
6744 bool var_definition_p
= false;
6747 if (decl
== error_mark_node
)
6752 error ("assignment (not initialization) in declaration");
6756 gcc_assert (TREE_CODE (decl
) != RESULT_DECL
);
6757 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
6758 gcc_assert (TREE_CODE (decl
) != PARM_DECL
);
6760 type
= TREE_TYPE (decl
);
6761 if (type
== error_mark_node
)
6764 /* Warn about register storage specifiers except when in GNU global
6765 or local register variable extension. */
6766 if (VAR_P (decl
) && DECL_REGISTER (decl
) && asmspec_tree
== NULL_TREE
)
6768 if (cxx_dialect
>= cxx17
)
6769 pedwarn (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
6770 "ISO C++17 does not allow %<register%> storage "
6773 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
6774 "%<register%> storage class specifier used");
6777 /* If a name was specified, get the string. */
6778 if (at_namespace_scope_p ())
6779 asmspec_tree
= maybe_apply_renaming_pragma (decl
, asmspec_tree
);
6780 if (asmspec_tree
&& asmspec_tree
!= error_mark_node
)
6781 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
6783 if (current_class_type
6784 && CP_DECL_CONTEXT (decl
) == current_class_type
6785 && TYPE_BEING_DEFINED (current_class_type
)
6786 && !CLASSTYPE_TEMPLATE_INSTANTIATION (current_class_type
)
6787 && (DECL_INITIAL (decl
) || init
))
6788 DECL_INITIALIZED_IN_CLASS_P (decl
) = 1;
6790 if (TREE_CODE (decl
) != FUNCTION_DECL
6791 && (auto_node
= type_uses_auto (type
)))
6794 if (init
== NULL_TREE
)
6796 if (DECL_LANG_SPECIFIC (decl
)
6797 && DECL_TEMPLATE_INSTANTIATION (decl
)
6798 && !DECL_TEMPLATE_INSTANTIATED (decl
))
6800 /* init is null because we're deferring instantiating the
6801 initializer until we need it. Well, we need it now. */
6802 instantiate_decl (decl
, /*defer_ok*/true, /*expl*/false);
6806 gcc_assert (CLASS_PLACEHOLDER_TEMPLATE (auto_node
));
6811 if (TREE_CODE (d_init
) == TREE_LIST
6812 && !CLASS_PLACEHOLDER_TEMPLATE (auto_node
))
6813 d_init
= build_x_compound_expr_from_list (d_init
, ELK_INIT
,
6814 tf_warning_or_error
);
6815 d_init
= resolve_nondeduced_context (d_init
, tf_warning_or_error
);
6817 enum auto_deduction_context adc
= adc_variable_type
;
6818 if (VAR_P (decl
) && DECL_DECOMPOSITION_P (decl
))
6819 adc
= adc_decomp_type
;
6820 type
= TREE_TYPE (decl
) = do_auto_deduction (type
, d_init
, auto_node
,
6821 tf_warning_or_error
, adc
,
6823 if (type
== error_mark_node
)
6825 if (TREE_CODE (type
) == FUNCTION_TYPE
)
6827 error ("initializer for %<decltype(auto) %D%> has function type "
6828 "(did you forget the %<()%> ?)", decl
);
6829 TREE_TYPE (decl
) = error_mark_node
;
6832 cp_apply_type_quals_to_decl (cp_type_quals (type
), decl
);
6835 if (ensure_literal_type_for_constexpr_object (decl
)
6838 DECL_DECLARED_CONSTEXPR_P (decl
) = 0;
6843 && DECL_CLASS_SCOPE_P (decl
)
6844 && DECL_INITIALIZED_IN_CLASS_P (decl
))
6845 check_static_variable_definition (decl
, type
);
6847 if (init
&& TREE_CODE (decl
) == FUNCTION_DECL
)
6850 if (init
== ridpointers
[(int)RID_DELETE
])
6852 /* FIXME check this is 1st decl. */
6853 DECL_DELETED_FN (decl
) = 1;
6854 DECL_DECLARED_INLINE_P (decl
) = 1;
6855 DECL_INITIAL (decl
) = error_mark_node
;
6856 FOR_EACH_CLONE (clone
, decl
)
6858 DECL_DELETED_FN (clone
) = 1;
6859 DECL_DECLARED_INLINE_P (clone
) = 1;
6860 DECL_INITIAL (clone
) = error_mark_node
;
6864 else if (init
== ridpointers
[(int)RID_DEFAULT
])
6866 if (defaultable_fn_check (decl
))
6867 DECL_DEFAULTED_FN (decl
) = 1;
6869 DECL_INITIAL (decl
) = NULL_TREE
;
6873 if (init
&& VAR_P (decl
))
6875 DECL_NONTRIVIALLY_INITIALIZED_P (decl
) = 1;
6876 /* If DECL is a reference, then we want to know whether init is a
6877 reference constant; init_const_expr_p as passed tells us whether
6878 it's an rvalue constant. */
6879 if (TREE_CODE (type
) == REFERENCE_TYPE
)
6880 init_const_expr_p
= potential_constant_expression (init
);
6881 if (init_const_expr_p
)
6883 /* Set these flags now for templates. We'll update the flags in
6884 store_init_value for instantiations. */
6885 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
) = 1;
6886 if (decl_maybe_constant_var_p (decl
)
6887 /* FIXME setting TREE_CONSTANT on refs breaks the back end. */
6888 && TREE_CODE (type
) != REFERENCE_TYPE
)
6889 TREE_CONSTANT (decl
) = 1;
6893 if (processing_template_decl
)
6895 bool type_dependent_p
;
6897 /* Add this declaration to the statement-tree. */
6898 if (at_function_scope_p ())
6899 add_decl_expr (decl
);
6901 type_dependent_p
= dependent_type_p (type
);
6903 if (check_for_bare_parameter_packs (init
))
6906 DECL_INITIAL (decl
) = NULL_TREE
;
6909 /* Generally, initializers in templates are expanded when the
6910 template is instantiated. But, if DECL is a variable constant
6911 then it can be used in future constant expressions, so its value
6912 must be available. */
6914 bool dep_init
= false;
6916 if (!VAR_P (decl
) || type_dependent_p
)
6917 /* We can't do anything if the decl has dependent type. */;
6918 else if (!init
&& is_concept_var (decl
))
6919 error ("variable concept has no initializer");
6921 && init_const_expr_p
6922 && TREE_CODE (type
) != REFERENCE_TYPE
6923 && decl_maybe_constant_var_p (decl
)
6924 && !(dep_init
= value_dependent_init_p (init
)))
6926 /* This variable seems to be a non-dependent constant, so process
6927 its initializer. If check_initializer returns non-null the
6928 initialization wasn't constant after all. */
6930 cleanups
= make_tree_vector ();
6931 init_code
= check_initializer (decl
, init
, flags
, &cleanups
);
6932 if (init_code
== NULL_TREE
)
6934 release_tree_vector (cleanups
);
6936 else if (!DECL_PRETTY_FUNCTION_P (decl
))
6938 /* Deduce array size even if the initializer is dependent. */
6939 maybe_deduce_size_from_array_init (decl
, init
);
6940 /* And complain about multiple initializers. */
6941 if (init
&& TREE_CODE (init
) == TREE_LIST
&& TREE_CHAIN (init
)
6942 && !MAYBE_CLASS_TYPE_P (type
))
6943 init
= build_x_compound_expr_from_list (init
, ELK_INIT
,
6944 tf_warning_or_error
);
6948 DECL_INITIAL (decl
) = init
;
6951 retrofit_lang_decl (decl
);
6952 SET_DECL_DEPENDENT_INIT_P (decl
, true);
6957 /* Just store non-static data member initializers for later. */
6958 if (init
&& TREE_CODE (decl
) == FIELD_DECL
)
6959 DECL_INITIAL (decl
) = init
;
6961 /* Take care of TYPE_DECLs up front. */
6962 if (TREE_CODE (decl
) == TYPE_DECL
)
6964 if (type
!= error_mark_node
6965 && MAYBE_CLASS_TYPE_P (type
) && DECL_NAME (decl
))
6967 if (TREE_TYPE (DECL_NAME (decl
)) && TREE_TYPE (decl
) != type
)
6968 warning (0, "shadowing previous type declaration of %q#D", decl
);
6969 set_identifier_type_value (DECL_NAME (decl
), decl
);
6972 /* If we have installed this as the canonical typedef for this
6973 type, and that type has not been defined yet, delay emitting
6974 the debug information for it, as we will emit it later. */
6975 if (TYPE_MAIN_DECL (TREE_TYPE (decl
)) == decl
6976 && !COMPLETE_TYPE_P (TREE_TYPE (decl
)))
6977 TYPE_DECL_SUPPRESS_DEBUG (decl
) = 1;
6979 rest_of_decl_compilation (decl
, DECL_FILE_SCOPE_P (decl
),
6984 /* A reference will be modified here, as it is initialized. */
6985 if (! DECL_EXTERNAL (decl
)
6986 && TREE_READONLY (decl
)
6987 && TREE_CODE (type
) == REFERENCE_TYPE
)
6990 TREE_READONLY (decl
) = 0;
6995 /* If this is a local variable that will need a mangled name,
6996 register it now. We must do this before processing the
6997 initializer for the variable, since the initialization might
6998 require a guard variable, and since the mangled name of the
6999 guard variable will depend on the mangled name of this
7001 if (DECL_FUNCTION_SCOPE_P (decl
)
7002 && TREE_STATIC (decl
)
7003 && !DECL_ARTIFICIAL (decl
))
7005 push_local_name (decl
);
7006 /* Normally has_forced_label_in_static is set during GIMPLE
7007 lowering, but [cd]tors are never actually compiled directly.
7008 We need to set this early so we can deal with the label
7009 address extension. */
7010 if ((DECL_CONSTRUCTOR_P (current_function_decl
)
7011 || DECL_DESTRUCTOR_P (current_function_decl
))
7014 walk_tree (&init
, notice_forced_label_r
, NULL
, NULL
);
7015 add_local_decl (cfun
, decl
);
7017 /* And make sure it's in the symbol table for
7018 c_parse_final_cleanups to find. */
7019 varpool_node::get_create (decl
);
7022 /* Convert the initializer to the type of DECL, if we have not
7023 already initialized DECL. */
7024 if (!DECL_INITIALIZED_P (decl
)
7025 /* If !DECL_EXTERNAL then DECL is being defined. In the
7026 case of a static data member initialized inside the
7027 class-specifier, there can be an initializer even if DECL
7028 is *not* defined. */
7029 && (!DECL_EXTERNAL (decl
) || init
))
7031 cleanups
= make_tree_vector ();
7032 init
= check_initializer (decl
, init
, flags
, &cleanups
);
7038 The memory occupied by any object of static storage
7039 duration is zero-initialized at program startup before
7040 any other initialization takes place.
7042 We cannot create an appropriate initializer until after
7043 the type of DECL is finalized. If DECL_INITIAL is set,
7044 then the DECL is statically initialized, and any
7045 necessary zero-initialization has already been performed. */
7046 if (TREE_STATIC (decl
) && !DECL_INITIAL (decl
))
7047 DECL_INITIAL (decl
) = build_zero_init (TREE_TYPE (decl
),
7048 /*nelts=*/NULL_TREE
,
7049 /*static_storage_p=*/true);
7050 /* Remember that the initialization for this variable has
7052 DECL_INITIALIZED_P (decl
) = 1;
7053 /* This declaration is the definition of this variable,
7054 unless we are initializing a static data member within
7055 the class specifier. */
7056 if (!DECL_EXTERNAL (decl
))
7057 var_definition_p
= true;
7059 /* If the variable has an array type, lay out the type, even if
7060 there is no initializer. It is valid to index through the
7061 array, and we must get TYPE_ALIGN set correctly on the array
7063 else if (TREE_CODE (type
) == ARRAY_TYPE
)
7066 if (TREE_STATIC (decl
)
7067 && !at_function_scope_p ()
7068 && current_function_decl
== NULL
)
7069 /* So decl is a global variable or a static member of a
7070 non local class. Record the types it uses
7071 so that we can decide later to emit debug info for them. */
7072 record_types_used_by_current_var_decl (decl
);
7075 /* Add this declaration to the statement-tree. This needs to happen
7076 after the call to check_initializer so that the DECL_EXPR for a
7077 reference temp is added before the DECL_EXPR for the reference itself. */
7078 if (DECL_FUNCTION_SCOPE_P (decl
))
7080 /* If we're building a variable sized type, and we might be
7081 reachable other than via the top of the current binding
7082 level, then create a new BIND_EXPR so that we deallocate
7083 the object at the right time. */
7086 && !TREE_CONSTANT (DECL_SIZE (decl
))
7087 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list
))
7090 bind
= build3 (BIND_EXPR
, void_type_node
, NULL
, NULL
, NULL
);
7091 TREE_SIDE_EFFECTS (bind
) = 1;
7093 BIND_EXPR_BODY (bind
) = push_stmt_list ();
7095 add_decl_expr (decl
);
7098 /* Let the middle end know about variables and functions -- but not
7099 static data members in uninstantiated class templates. */
7100 if (VAR_OR_FUNCTION_DECL_P (decl
))
7104 layout_var_decl (decl
);
7105 maybe_commonize_var (decl
);
7108 /* This needs to happen after the linkage is set. */
7109 determine_visibility (decl
);
7111 if (var_definition_p
&& TREE_STATIC (decl
))
7113 /* If a TREE_READONLY variable needs initialization
7114 at runtime, it is no longer readonly and we need to
7115 avoid MEM_READONLY_P being set on RTL created for it. */
7118 if (TREE_READONLY (decl
))
7119 TREE_READONLY (decl
) = 0;
7122 else if (was_readonly
)
7123 TREE_READONLY (decl
) = 1;
7125 /* Likewise if it needs destruction. */
7126 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
))
7127 TREE_READONLY (decl
) = 0;
7130 make_rtl_for_nonlocal_decl (decl
, init
, asmspec
);
7132 /* Check for abstractness of the type. Notice that there is no
7133 need to strip array types here since the check for those types
7134 is already done within create_array_type_for_decl. */
7135 abstract_virtuals_error (decl
, type
);
7137 if (TREE_TYPE (decl
) == error_mark_node
)
7138 /* No initialization required. */
7140 else if (TREE_CODE (decl
) == FUNCTION_DECL
)
7144 if (init
== ridpointers
[(int)RID_DEFAULT
])
7146 /* An out-of-class default definition is defined at
7147 the point where it is explicitly defaulted. */
7148 if (DECL_DELETED_FN (decl
))
7149 maybe_explain_implicit_delete (decl
);
7150 else if (DECL_INITIAL (decl
) == error_mark_node
)
7151 synthesize_method (decl
);
7154 error ("function %q#D is initialized like a variable", decl
);
7156 /* else no initialization required. */
7158 else if (DECL_EXTERNAL (decl
)
7159 && ! (DECL_LANG_SPECIFIC (decl
)
7160 && DECL_NOT_REALLY_EXTERN (decl
)))
7163 DECL_INITIAL (decl
) = init
;
7165 /* A variable definition. */
7166 else if (DECL_FUNCTION_SCOPE_P (decl
) && !TREE_STATIC (decl
))
7167 /* Initialize the local variable. */
7168 initialize_local_var (decl
, init
);
7170 /* If a variable is defined, and then a subsequent
7171 definition with external linkage is encountered, we will
7172 get here twice for the same variable. We want to avoid
7173 calling expand_static_init more than once. For variables
7174 that are not static data members, we can call
7175 expand_static_init only when we actually process the
7176 initializer. It is not legal to redeclare a static data
7177 member, so this issue does not arise in that case. */
7178 else if (var_definition_p
&& TREE_STATIC (decl
))
7179 expand_static_init (decl
, init
);
7182 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
7183 reference, insert it in the statement-tree now. */
7187 FOR_EACH_VEC_ELT (*cleanups
, i
, t
)
7188 push_cleanup (decl
, t
, false);
7189 release_tree_vector (cleanups
);
7193 TREE_READONLY (decl
) = 1;
7195 invoke_plugin_callbacks (PLUGIN_FINISH_DECL
, decl
);
7198 /* For class TYPE return itself or some its bases that contain
7199 any direct non-static data members. Return error_mark_node if an
7200 error has been diagnosed. */
7203 find_decomp_class_base (location_t loc
, tree type
, tree ret
)
7205 bool member_seen
= false;
7206 for (tree field
= TYPE_FIELDS (type
); field
; field
= DECL_CHAIN (field
))
7207 if (TREE_CODE (field
) != FIELD_DECL
7208 || DECL_ARTIFICIAL (field
)
7209 || DECL_UNNAMED_BIT_FIELD (field
))
7213 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field
)))
7215 if (TREE_CODE (TREE_TYPE (field
)) == RECORD_TYPE
)
7216 error_at (loc
, "cannot decompose class type %qT because it has an "
7217 "anonymous struct member", type
);
7219 error_at (loc
, "cannot decompose class type %qT because it has an "
7220 "anonymous union member", type
);
7221 inform (DECL_SOURCE_LOCATION (field
), "declared here");
7222 return error_mark_node
;
7224 else if (TREE_PRIVATE (field
) || TREE_PROTECTED (field
))
7226 error_at (loc
, "cannot decompose non-public member %qD of %qT",
7228 inform (DECL_SOURCE_LOCATION (field
),
7229 TREE_PRIVATE (field
)
7230 ? G_("declared private here")
7231 : G_("declared protected here"));
7232 return error_mark_node
;
7237 tree base_binfo
, binfo
;
7238 tree orig_ret
= ret
;
7242 for (binfo
= TYPE_BINFO (type
), i
= 0;
7243 BINFO_BASE_ITERATE (binfo
, i
, base_binfo
); i
++)
7245 tree t
= find_decomp_class_base (loc
, TREE_TYPE (base_binfo
), ret
);
7246 if (t
== error_mark_node
)
7247 return error_mark_node
;
7248 if (t
!= NULL_TREE
&& t
!= ret
)
7252 error_at (loc
, "cannot decompose class type %qT: both it and "
7253 "its base class %qT have non-static data members",
7255 return error_mark_node
;
7257 else if (orig_ret
!= NULL_TREE
)
7259 else if (ret
!= NULL_TREE
)
7261 error_at (loc
, "cannot decompose class type %qT: its base "
7262 "classes %qT and %qT have non-static data "
7263 "members", type
, ret
, t
);
7264 return error_mark_node
;
7273 /* Return std::tuple_size<TYPE>::value. */
7276 get_tuple_size (tree type
)
7278 tree args
= make_tree_vec (1);
7279 TREE_VEC_ELT (args
, 0) = type
;
7280 tree inst
= lookup_template_class (get_identifier ("tuple_size"), args
,
7281 /*in_decl*/NULL_TREE
,
7282 /*context*/std_node
,
7283 /*entering_scope*/false, tf_none
);
7284 inst
= complete_type (inst
);
7285 if (inst
== error_mark_node
|| !COMPLETE_TYPE_P (inst
))
7287 tree val
= lookup_qualified_name (inst
, get_identifier ("value"),
7288 /*type*/false, /*complain*/false);
7289 if (TREE_CODE (val
) == VAR_DECL
|| TREE_CODE (val
) == CONST_DECL
)
7290 val
= maybe_constant_value (val
);
7291 if (TREE_CODE (val
) == INTEGER_CST
)
7294 return error_mark_node
;
7297 /* Return std::tuple_element<I,TYPE>::type. */
7300 get_tuple_element_type (tree type
, unsigned i
)
7302 tree args
= make_tree_vec (2);
7303 TREE_VEC_ELT (args
, 0) = build_int_cst (integer_type_node
, i
);
7304 TREE_VEC_ELT (args
, 1) = type
;
7305 tree inst
= lookup_template_class (get_identifier ("tuple_element"), args
,
7306 /*in_decl*/NULL_TREE
,
7307 /*context*/std_node
,
7308 /*entering_scope*/false,
7309 tf_warning_or_error
);
7310 return make_typename_type (inst
, get_identifier ("type"),
7311 none_type
, tf_warning_or_error
);
7314 /* Return e.get<i>() or get<i>(e). */
7317 get_tuple_decomp_init (tree decl
, unsigned i
)
7319 tree get_id
= get_identifier ("get");
7320 tree targs
= make_tree_vec (1);
7321 TREE_VEC_ELT (targs
, 0) = build_int_cst (integer_type_node
, i
);
7323 tree etype
= TREE_TYPE (decl
);
7324 tree e
= convert_from_reference (decl
);
7326 /* [The id-expression] e is an lvalue if the type of the entity e is an
7327 lvalue reference and an xvalue otherwise. */
7328 if (TREE_CODE (etype
) != REFERENCE_TYPE
7329 || TYPE_REF_IS_RVALUE (etype
))
7332 tree fns
= lookup_qualified_name (TREE_TYPE (e
), get_id
,
7333 /*type*/false, /*complain*/false);
7334 if (fns
!= error_mark_node
)
7336 fns
= lookup_template_function (fns
, targs
);
7337 return build_new_method_call (e
, fns
, /*args*/NULL
,
7338 /*path*/NULL_TREE
, LOOKUP_NORMAL
,
7339 /*fn_p*/NULL
, tf_warning_or_error
);
7343 vec
<tree
,va_gc
> *args
= make_tree_vector_single (e
);
7344 fns
= lookup_template_function (get_id
, targs
);
7345 fns
= perform_koenig_lookup (fns
, args
, tf_warning_or_error
);
7346 return finish_call_expr (fns
, &args
, /*novirt*/false,
7347 /*koenig*/true, tf_warning_or_error
);
7351 /* It's impossible to recover the decltype of a tuple decomposition variable
7352 based on the actual type of the variable, so store it in a hash table. */
7354 static GTY((cache
)) tree_cache_map
*decomp_type_table
;
7356 store_decomp_type (tree v
, tree t
)
7358 if (!decomp_type_table
)
7359 decomp_type_table
= tree_cache_map::create_ggc (13);
7360 decomp_type_table
->put (v
, t
);
7364 lookup_decomp_type (tree v
)
7366 return *decomp_type_table
->get (v
);
7369 /* Mangle a decomposition declaration if needed. Arguments like
7370 in cp_finish_decomp. */
7373 cp_maybe_mangle_decomp (tree decl
, tree first
, unsigned int count
)
7375 if (!processing_template_decl
7376 && !error_operand_p (decl
)
7377 && DECL_NAMESPACE_SCOPE_P (decl
))
7379 auto_vec
<tree
, 16> v
;
7380 v
.safe_grow (count
);
7382 for (unsigned int i
= 0; i
< count
; i
++, d
= DECL_CHAIN (d
))
7383 v
[count
- i
- 1] = d
;
7384 SET_DECL_ASSEMBLER_NAME (decl
, mangle_decomp (decl
, v
));
7388 /* Finish a decomposition declaration. DECL is the underlying declaration
7389 "e", FIRST is the head of a chain of decls for the individual identifiers
7390 chained through DECL_CHAIN in reverse order and COUNT is the number of
7394 cp_finish_decomp (tree decl
, tree first
, unsigned int count
)
7396 if (error_operand_p (decl
))
7401 TREE_TYPE (first
) = error_mark_node
;
7402 if (DECL_HAS_VALUE_EXPR_P (first
))
7404 SET_DECL_VALUE_EXPR (first
, NULL_TREE
);
7405 DECL_HAS_VALUE_EXPR_P (first
) = 0;
7407 first
= DECL_CHAIN (first
);
7409 if (DECL_P (decl
) && DECL_NAMESPACE_SCOPE_P (decl
))
7410 SET_DECL_ASSEMBLER_NAME (decl
, get_identifier ("<decomp>"));
7414 location_t loc
= DECL_SOURCE_LOCATION (decl
);
7415 if (type_dependent_expression_p (decl
)
7416 /* This happens for range for when not in templates.
7417 Still add the DECL_VALUE_EXPRs for later processing. */
7418 || (!processing_template_decl
7419 && type_uses_auto (TREE_TYPE (decl
))))
7421 for (unsigned int i
= 0; i
< count
; i
++)
7423 if (!DECL_HAS_VALUE_EXPR_P (first
))
7425 tree v
= build_nt (ARRAY_REF
, decl
,
7426 size_int (count
- i
- 1),
7427 NULL_TREE
, NULL_TREE
);
7428 SET_DECL_VALUE_EXPR (first
, v
);
7429 DECL_HAS_VALUE_EXPR_P (first
) = 1;
7431 if (processing_template_decl
)
7432 fit_decomposition_lang_decl (first
, decl
);
7433 first
= DECL_CHAIN (first
);
7438 auto_vec
<tree
, 16> v
;
7439 v
.safe_grow (count
);
7441 for (unsigned int i
= 0; i
< count
; i
++, d
= DECL_CHAIN (d
))
7443 v
[count
- i
- 1] = d
;
7444 fit_decomposition_lang_decl (d
, decl
);
7447 tree type
= TREE_TYPE (decl
);
7450 if (TREE_CODE (type
) == REFERENCE_TYPE
)
7452 dexp
= convert_from_reference (dexp
);
7453 type
= complete_type (TREE_TYPE (type
));
7454 if (type
== error_mark_node
)
7456 if (!COMPLETE_TYPE_P (type
))
7458 error_at (loc
, "structured binding refers to incomplete type %qT",
7464 tree eltype
= NULL_TREE
;
7465 unsigned HOST_WIDE_INT eltscnt
= 0;
7466 if (TREE_CODE (type
) == ARRAY_TYPE
)
7469 nelts
= array_type_nelts_top (type
);
7470 if (nelts
== error_mark_node
)
7472 if (!tree_fits_uhwi_p (nelts
))
7474 error_at (loc
, "cannot decompose variable length array %qT", type
);
7477 eltscnt
= tree_to_uhwi (nelts
);
7478 if (count
!= eltscnt
)
7481 if (count
> eltscnt
)
7482 error_n (loc
, count
,
7483 "%u name provided for structured binding",
7484 "%u names provided for structured binding", count
);
7486 error_n (loc
, count
,
7487 "only %u name provided for structured binding",
7488 "only %u names provided for structured binding", count
);
7489 /* Some languages have special plural rules even for large values,
7490 but it is periodic with period of 10, 100, 1000 etc. */
7491 inform_n (loc
, eltscnt
> INT_MAX
7492 ? (eltscnt
% 1000000) + 1000000 : eltscnt
,
7493 "while %qT decomposes into %wu element",
7494 "while %qT decomposes into %wu elements",
7498 eltype
= TREE_TYPE (type
);
7499 for (unsigned int i
= 0; i
< count
; i
++)
7501 TREE_TYPE (v
[i
]) = eltype
;
7502 layout_decl (v
[i
], 0);
7503 if (processing_template_decl
)
7505 tree t
= unshare_expr (dexp
);
7506 t
= build4_loc (DECL_SOURCE_LOCATION (v
[i
]), ARRAY_REF
,
7507 eltype
, t
, size_int (i
), NULL_TREE
,
7509 SET_DECL_VALUE_EXPR (v
[i
], t
);
7510 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7513 /* 2 GNU extensions. */
7514 else if (TREE_CODE (type
) == COMPLEX_TYPE
)
7517 if (count
!= eltscnt
)
7519 eltype
= cp_build_qualified_type (TREE_TYPE (type
), TYPE_QUALS (type
));
7520 for (unsigned int i
= 0; i
< count
; i
++)
7522 TREE_TYPE (v
[i
]) = eltype
;
7523 layout_decl (v
[i
], 0);
7524 if (processing_template_decl
)
7526 tree t
= unshare_expr (dexp
);
7527 t
= build1_loc (DECL_SOURCE_LOCATION (v
[i
]),
7528 i
? IMAGPART_EXPR
: REALPART_EXPR
, eltype
,
7530 SET_DECL_VALUE_EXPR (v
[i
], t
);
7531 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7534 else if (TREE_CODE (type
) == VECTOR_TYPE
)
7536 if (!TYPE_VECTOR_SUBPARTS (type
).is_constant (&eltscnt
))
7538 error_at (loc
, "cannot decompose variable length vector %qT", type
);
7541 if (count
!= eltscnt
)
7543 eltype
= cp_build_qualified_type (TREE_TYPE (type
), TYPE_QUALS (type
));
7544 for (unsigned int i
= 0; i
< count
; i
++)
7546 TREE_TYPE (v
[i
]) = eltype
;
7547 layout_decl (v
[i
], 0);
7548 if (processing_template_decl
)
7550 tree t
= unshare_expr (dexp
);
7551 convert_vector_to_array_for_subscript (DECL_SOURCE_LOCATION (v
[i
]),
7553 t
= build4_loc (DECL_SOURCE_LOCATION (v
[i
]), ARRAY_REF
,
7554 eltype
, t
, size_int (i
), NULL_TREE
,
7556 SET_DECL_VALUE_EXPR (v
[i
], t
);
7557 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7560 else if (tree tsize
= get_tuple_size (type
))
7562 if (tsize
== error_mark_node
)
7564 error_at (loc
, "%<std::tuple_size<%T>::value%> is not an integral "
7565 "constant expression", type
);
7568 if (!tree_fits_uhwi_p (tsize
))
7570 error_n (loc
, count
,
7571 "%u name provided for structured binding",
7572 "%u names provided for structured binding", count
);
7573 inform (loc
, "while %qT decomposes into %E elements",
7577 eltscnt
= tree_to_uhwi (tsize
);
7578 if (count
!= eltscnt
)
7580 int save_read
= DECL_READ_P (decl
);
7581 for (unsigned i
= 0; i
< count
; ++i
)
7583 location_t sloc
= input_location
;
7584 location_t dloc
= DECL_SOURCE_LOCATION (v
[i
]);
7586 input_location
= dloc
;
7587 tree init
= get_tuple_decomp_init (decl
, i
);
7588 tree eltype
= (init
== error_mark_node
? error_mark_node
7589 : get_tuple_element_type (type
, i
));
7590 input_location
= sloc
;
7592 if (init
== error_mark_node
|| eltype
== error_mark_node
)
7594 inform (dloc
, "in initialization of structured binding "
7595 "variable %qD", v
[i
]);
7598 /* Save the decltype away before reference collapse. */
7599 store_decomp_type (v
[i
], eltype
);
7600 eltype
= cp_build_reference_type (eltype
, !lvalue_p (init
));
7601 TREE_TYPE (v
[i
]) = eltype
;
7602 layout_decl (v
[i
], 0);
7603 if (DECL_HAS_VALUE_EXPR_P (v
[i
]))
7605 /* In this case the names are variables, not just proxies. */
7606 SET_DECL_VALUE_EXPR (v
[i
], NULL_TREE
);
7607 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 0;
7609 if (!processing_template_decl
)
7610 cp_finish_decl (v
[i
], init
, /*constexpr*/false,
7611 /*asm*/NULL_TREE
, LOOKUP_NORMAL
);
7613 /* Ignore reads from the underlying decl performed during initialization
7614 of the individual variables. If those will be read, we'll mark
7615 the underlying decl as read at that point. */
7616 DECL_READ_P (decl
) = save_read
;
7618 else if (TREE_CODE (type
) == UNION_TYPE
)
7620 error_at (loc
, "cannot decompose union type %qT", type
);
7623 else if (!CLASS_TYPE_P (type
))
7625 error_at (loc
, "cannot decompose non-array non-class type %qT", type
);
7628 else if (LAMBDA_TYPE_P (type
))
7630 error_at (loc
, "cannot decompose lambda closure type %qT", type
);
7635 tree btype
= find_decomp_class_base (loc
, type
, NULL_TREE
);
7636 if (btype
== error_mark_node
)
7638 else if (btype
== NULL_TREE
)
7640 error_at (loc
, "cannot decompose class type %qT without non-static "
7641 "data members", type
);
7644 for (tree field
= TYPE_FIELDS (btype
); field
; field
= TREE_CHAIN (field
))
7645 if (TREE_CODE (field
) != FIELD_DECL
7646 || DECL_ARTIFICIAL (field
)
7647 || DECL_UNNAMED_BIT_FIELD (field
))
7651 if (count
!= eltscnt
)
7656 t
= convert_to_base (t
, btype
, /*check_access*/true,
7657 /*nonnull*/false, tf_warning_or_error
);
7661 for (tree field
= TYPE_FIELDS (btype
); field
; field
= TREE_CHAIN (field
))
7662 if (TREE_CODE (field
) != FIELD_DECL
7663 || DECL_ARTIFICIAL (field
)
7664 || DECL_UNNAMED_BIT_FIELD (field
))
7668 tree tt
= finish_non_static_data_member (field
, unshare_expr (t
),
7670 if (REFERENCE_REF_P (tt
))
7671 tt
= TREE_OPERAND (tt
, 0);
7672 TREE_TYPE (v
[i
]) = TREE_TYPE (tt
);
7673 layout_decl (v
[i
], 0);
7674 if (!processing_template_decl
)
7676 SET_DECL_VALUE_EXPR (v
[i
], tt
);
7677 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7682 if (processing_template_decl
)
7684 for (unsigned int i
= 0; i
< count
; i
++)
7685 if (!DECL_HAS_VALUE_EXPR_P (v
[i
]))
7687 tree a
= build_nt (ARRAY_REF
, decl
, size_int (i
),
7688 NULL_TREE
, NULL_TREE
);
7689 SET_DECL_VALUE_EXPR (v
[i
], a
);
7690 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7695 /* Returns a declaration for a VAR_DECL as if:
7697 extern "C" TYPE NAME;
7699 had been seen. Used to create compiler-generated global
7703 declare_global_var (tree name
, tree type
)
7707 push_to_top_level ();
7708 decl
= build_decl (input_location
, VAR_DECL
, name
, type
);
7709 TREE_PUBLIC (decl
) = 1;
7710 DECL_EXTERNAL (decl
) = 1;
7711 DECL_ARTIFICIAL (decl
) = 1;
7712 DECL_CONTEXT (decl
) = FROB_CONTEXT (global_namespace
);
7713 /* If the user has explicitly declared this variable (perhaps
7714 because the code we are compiling is part of a low-level runtime
7715 library), then it is possible that our declaration will be merged
7716 with theirs by pushdecl. */
7717 decl
= pushdecl (decl
);
7718 cp_finish_decl (decl
, NULL_TREE
, false, NULL_TREE
, 0);
7719 pop_from_top_level ();
7724 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
7725 if "__cxa_atexit" is not being used) corresponding to the function
7726 to be called when the program exits. */
7729 get_atexit_fn_ptr_type (void)
7733 if (!atexit_fn_ptr_type_node
)
7736 if (flag_use_cxa_atexit
7737 && !targetm
.cxx
.use_atexit_for_cxa_atexit ())
7738 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
7739 arg_type
= ptr_type_node
;
7741 /* The parameter to "atexit" is "void (*)(void)". */
7742 arg_type
= NULL_TREE
;
7744 fn_type
= build_function_type_list (void_type_node
,
7745 arg_type
, NULL_TREE
);
7746 atexit_fn_ptr_type_node
= build_pointer_type (fn_type
);
7749 return atexit_fn_ptr_type_node
;
7752 /* Returns a pointer to the `atexit' function. Note that if
7753 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
7754 `__cxa_atexit' function specified in the IA64 C++ ABI. */
7757 get_atexit_node (void)
7763 bool use_aeabi_atexit
;
7768 if (flag_use_cxa_atexit
&& !targetm
.cxx
.use_atexit_for_cxa_atexit ())
7770 /* The declaration for `__cxa_atexit' is:
7772 int __cxa_atexit (void (*)(void *), void *, void *)
7774 We build up the argument types and then the function type
7776 tree argtype0
, argtype1
, argtype2
;
7778 use_aeabi_atexit
= targetm
.cxx
.use_aeabi_atexit ();
7779 /* First, build the pointer-to-function type for the first
7781 fn_ptr_type
= get_atexit_fn_ptr_type ();
7782 /* Then, build the rest of the argument types. */
7783 argtype2
= ptr_type_node
;
7784 if (use_aeabi_atexit
)
7786 argtype1
= fn_ptr_type
;
7787 argtype0
= ptr_type_node
;
7791 argtype1
= ptr_type_node
;
7792 argtype0
= fn_ptr_type
;
7794 /* And the final __cxa_atexit type. */
7795 fn_type
= build_function_type_list (integer_type_node
,
7796 argtype0
, argtype1
, argtype2
,
7798 if (use_aeabi_atexit
)
7799 name
= "__aeabi_atexit";
7801 name
= "__cxa_atexit";
7805 /* The declaration for `atexit' is:
7807 int atexit (void (*)());
7809 We build up the argument types and then the function type
7811 fn_ptr_type
= get_atexit_fn_ptr_type ();
7812 /* Build the final atexit type. */
7813 fn_type
= build_function_type_list (integer_type_node
,
7814 fn_ptr_type
, NULL_TREE
);
7818 /* Now, build the function declaration. */
7819 push_lang_context (lang_name_c
);
7820 atexit_fndecl
= build_library_fn_ptr (name
, fn_type
, ECF_LEAF
| ECF_NOTHROW
);
7821 mark_used (atexit_fndecl
);
7822 pop_lang_context ();
7823 atexit_node
= decay_conversion (atexit_fndecl
, tf_warning_or_error
);
7828 /* Like get_atexit_node, but for thread-local cleanups. */
7831 get_thread_atexit_node (void)
7833 /* The declaration for `__cxa_thread_atexit' is:
7835 int __cxa_thread_atexit (void (*)(void *), void *, void *) */
7836 tree fn_type
= build_function_type_list (integer_type_node
,
7837 get_atexit_fn_ptr_type (),
7838 ptr_type_node
, ptr_type_node
,
7841 /* Now, build the function declaration. */
7842 tree atexit_fndecl
= build_library_fn_ptr ("__cxa_thread_atexit", fn_type
,
7843 ECF_LEAF
| ECF_NOTHROW
);
7844 return decay_conversion (atexit_fndecl
, tf_warning_or_error
);
7847 /* Returns the __dso_handle VAR_DECL. */
7850 get_dso_handle_node (void)
7852 if (dso_handle_node
)
7853 return dso_handle_node
;
7855 /* Declare the variable. */
7856 dso_handle_node
= declare_global_var (get_identifier ("__dso_handle"),
7859 #ifdef HAVE_GAS_HIDDEN
7860 if (dso_handle_node
!= error_mark_node
)
7862 DECL_VISIBILITY (dso_handle_node
) = VISIBILITY_HIDDEN
;
7863 DECL_VISIBILITY_SPECIFIED (dso_handle_node
) = 1;
7867 return dso_handle_node
;
7870 /* Begin a new function with internal linkage whose job will be simply
7871 to destroy some particular variable. */
7873 static GTY(()) int start_cleanup_cnt
;
7876 start_cleanup_fn (void)
7881 bool use_cxa_atexit
= flag_use_cxa_atexit
7882 && !targetm
.cxx
.use_atexit_for_cxa_atexit ();
7884 push_to_top_level ();
7886 /* No need to mangle this. */
7887 push_lang_context (lang_name_c
);
7889 /* Build the name of the function. */
7890 sprintf (name
, "__tcf_%d", start_cleanup_cnt
++);
7891 /* Build the function declaration. */
7892 fntype
= TREE_TYPE (get_atexit_fn_ptr_type ());
7893 fndecl
= build_lang_decl (FUNCTION_DECL
, get_identifier (name
), fntype
);
7894 /* It's a function with internal linkage, generated by the
7896 TREE_PUBLIC (fndecl
) = 0;
7897 DECL_ARTIFICIAL (fndecl
) = 1;
7898 /* Make the function `inline' so that it is only emitted if it is
7899 actually needed. It is unlikely that it will be inlined, since
7900 it is only called via a function pointer, but we avoid unnecessary
7901 emissions this way. */
7902 DECL_DECLARED_INLINE_P (fndecl
) = 1;
7903 DECL_INTERFACE_KNOWN (fndecl
) = 1;
7904 /* Build the parameter. */
7907 tree parmdecl
= cp_build_parm_decl (fndecl
, NULL_TREE
, ptr_type_node
);
7908 TREE_USED (parmdecl
) = 1;
7909 DECL_READ_P (parmdecl
) = 1;
7910 DECL_ARGUMENTS (fndecl
) = parmdecl
;
7914 start_preparsed_function (fndecl
, NULL_TREE
, SF_PRE_PARSED
);
7916 pop_lang_context ();
7918 return current_function_decl
;
7921 /* Finish the cleanup function begun by start_cleanup_fn. */
7924 end_cleanup_fn (void)
7926 expand_or_defer_fn (finish_function (/*inline_p=*/false));
7928 pop_from_top_level ();
7931 /* Generate code to handle the destruction of DECL, an object with
7932 static storage duration. */
7935 register_dtor_fn (tree decl
)
7942 bool ob_parm
, dso_parm
, use_dtor
;
7943 tree arg0
, arg1
, arg2
;
7946 type
= TREE_TYPE (decl
);
7947 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type
))
7950 /* If we're using "__cxa_atexit" (or "__cxa_thread_atexit" or
7951 "__aeabi_atexit"), and DECL is a class object, we can just pass the
7952 destructor to "__cxa_atexit"; we don't have to build a temporary
7953 function to do the cleanup. */
7954 dso_parm
= (flag_use_cxa_atexit
7955 && !targetm
.cxx
.use_atexit_for_cxa_atexit ());
7956 ob_parm
= (CP_DECL_THREAD_LOCAL_P (decl
) || dso_parm
);
7957 use_dtor
= ob_parm
&& CLASS_TYPE_P (type
);
7960 cleanup
= get_class_binding (type
, complete_dtor_identifier
);
7962 /* Make sure it is accessible. */
7963 perform_or_defer_access_check (TYPE_BINFO (type
), cleanup
, cleanup
,
7964 tf_warning_or_error
);
7968 /* Call build_cleanup before we enter the anonymous function so
7969 that any access checks will be done relative to the current
7970 scope, rather than the scope of the anonymous function. */
7971 build_cleanup (decl
);
7973 /* Now start the function. */
7974 cleanup
= start_cleanup_fn ();
7976 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
7977 to the original function, rather than the anonymous one. That
7978 will make the back end think that nested functions are in use,
7979 which causes confusion. */
7980 push_deferring_access_checks (dk_no_check
);
7981 fcall
= build_cleanup (decl
);
7982 pop_deferring_access_checks ();
7984 /* Create the body of the anonymous function. */
7985 compound_stmt
= begin_compound_stmt (BCS_FN_BODY
);
7986 finish_expr_stmt (fcall
);
7987 finish_compound_stmt (compound_stmt
);
7991 /* Call atexit with the cleanup function. */
7992 mark_used (cleanup
);
7993 cleanup
= build_address (cleanup
);
7995 if (CP_DECL_THREAD_LOCAL_P (decl
))
7996 atex_node
= get_thread_atexit_node ();
7998 atex_node
= get_atexit_node ();
8002 /* We must convert CLEANUP to the type that "__cxa_atexit"
8004 cleanup
= build_nop (get_atexit_fn_ptr_type (), cleanup
);
8005 /* "__cxa_atexit" will pass the address of DECL to the
8006 cleanup function. */
8008 addr
= build_address (decl
);
8009 /* The declared type of the parameter to "__cxa_atexit" is
8010 "void *". For plain "T*", we could just let the
8011 machinery in cp_build_function_call convert it -- but if the
8012 type is "cv-qualified T *", then we need to convert it
8013 before passing it in, to avoid spurious errors. */
8014 addr
= build_nop (ptr_type_node
, addr
);
8017 /* Since the cleanup functions we build ignore the address
8018 they're given, there's no reason to pass the actual address
8019 in, and, in general, it's cheaper to pass NULL than any
8021 addr
= null_pointer_node
;
8024 arg2
= cp_build_addr_expr (get_dso_handle_node (),
8025 tf_warning_or_error
);
8027 /* Just pass NULL to the dso handle parm if we don't actually
8028 have a DSO handle on this target. */
8029 arg2
= null_pointer_node
;
8035 if (!CP_DECL_THREAD_LOCAL_P (decl
)
8036 && targetm
.cxx
.use_aeabi_atexit ())
8052 return cp_build_function_call_nary (atex_node
, tf_warning_or_error
,
8053 arg0
, arg1
, arg2
, NULL_TREE
);
8056 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
8057 is its initializer. Generate code to handle the construction
8058 and destruction of DECL. */
8061 expand_static_init (tree decl
, tree init
)
8063 gcc_assert (VAR_P (decl
));
8064 gcc_assert (TREE_STATIC (decl
));
8066 /* Some variables require no dynamic initialization. */
8067 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl
)))
8069 /* Make sure the destructor is callable. */
8070 cxx_maybe_build_cleanup (decl
, tf_warning_or_error
);
8075 if (CP_DECL_THREAD_LOCAL_P (decl
) && DECL_GNU_TLS_P (decl
)
8076 && !DECL_FUNCTION_SCOPE_P (decl
))
8079 error ("non-local variable %qD declared %<__thread%> "
8080 "needs dynamic initialization", decl
);
8082 error ("non-local variable %qD declared %<__thread%> "
8083 "has a non-trivial destructor", decl
);
8084 static bool informed
;
8087 inform (DECL_SOURCE_LOCATION (decl
),
8088 "C++11 %<thread_local%> allows dynamic initialization "
8095 if (DECL_FUNCTION_SCOPE_P (decl
))
8097 /* Emit code to perform this initialization but once. */
8098 tree if_stmt
= NULL_TREE
, inner_if_stmt
= NULL_TREE
;
8099 tree then_clause
= NULL_TREE
, inner_then_clause
= NULL_TREE
;
8100 tree guard
, guard_addr
;
8102 /* We don't need thread-safety code for thread-local vars. */
8103 bool thread_guard
= (flag_threadsafe_statics
8104 && !CP_DECL_THREAD_LOCAL_P (decl
));
8106 /* Emit code to perform this initialization but once. This code
8109 static <type> guard;
8110 if (!__atomic_load (guard.first_byte)) {
8111 if (__cxa_guard_acquire (&guard)) {
8114 // Do initialization.
8115 flag = true; __cxa_guard_release (&guard);
8116 // Register variable for destruction at end of program.
8118 if (!flag) __cxa_guard_abort (&guard);
8123 Note that the `flag' variable is only set to 1 *after* the
8124 initialization is complete. This ensures that an exception,
8125 thrown during the construction, will cause the variable to
8126 reinitialized when we pass through this code again, as per:
8130 If the initialization exits by throwing an exception, the
8131 initialization is not complete, so it will be tried again
8132 the next time control enters the declaration.
8134 This process should be thread-safe, too; multiple threads
8135 should not be able to initialize the variable more than
8138 /* Create the guard variable. */
8139 guard
= get_guard (decl
);
8141 /* Begin the conditional initialization. */
8142 if_stmt
= begin_if_stmt ();
8144 finish_if_stmt_cond (get_guard_cond (guard
, thread_guard
), if_stmt
);
8145 then_clause
= begin_compound_stmt (BCS_NO_SCOPE
);
8149 tree vfntype
= NULL_TREE
;
8150 tree acquire_name
, release_name
, abort_name
;
8151 tree acquire_fn
, release_fn
, abort_fn
;
8152 guard_addr
= build_address (guard
);
8154 acquire_name
= get_identifier ("__cxa_guard_acquire");
8155 release_name
= get_identifier ("__cxa_guard_release");
8156 abort_name
= get_identifier ("__cxa_guard_abort");
8157 acquire_fn
= get_global_binding (acquire_name
);
8158 release_fn
= get_global_binding (release_name
);
8159 abort_fn
= get_global_binding (abort_name
);
8161 acquire_fn
= push_library_fn
8162 (acquire_name
, build_function_type_list (integer_type_node
,
8163 TREE_TYPE (guard_addr
),
8165 NULL_TREE
, ECF_NOTHROW
| ECF_LEAF
);
8166 if (!release_fn
|| !abort_fn
)
8167 vfntype
= build_function_type_list (void_type_node
,
8168 TREE_TYPE (guard_addr
),
8171 release_fn
= push_library_fn (release_name
, vfntype
, NULL_TREE
,
8172 ECF_NOTHROW
| ECF_LEAF
);
8174 abort_fn
= push_library_fn (abort_name
, vfntype
, NULL_TREE
,
8175 ECF_NOTHROW
| ECF_LEAF
);
8177 inner_if_stmt
= begin_if_stmt ();
8178 finish_if_stmt_cond (build_call_n (acquire_fn
, 1, guard_addr
),
8181 inner_then_clause
= begin_compound_stmt (BCS_NO_SCOPE
);
8182 begin
= get_target_expr (boolean_false_node
);
8183 flag
= TARGET_EXPR_SLOT (begin
);
8185 TARGET_EXPR_CLEANUP (begin
)
8186 = build3 (COND_EXPR
, void_type_node
, flag
,
8188 build_call_n (abort_fn
, 1, guard_addr
));
8189 CLEANUP_EH_ONLY (begin
) = 1;
8191 /* Do the initialization itself. */
8192 init
= add_stmt_to_compound (begin
, init
);
8193 init
= add_stmt_to_compound
8194 (init
, build2 (MODIFY_EXPR
, void_type_node
, flag
, boolean_true_node
));
8195 init
= add_stmt_to_compound
8196 (init
, build_call_n (release_fn
, 1, guard_addr
));
8199 init
= add_stmt_to_compound (init
, set_guard (guard
));
8201 /* Use atexit to register a function for destroying this static
8203 init
= add_stmt_to_compound (init
, register_dtor_fn (decl
));
8205 finish_expr_stmt (init
);
8209 finish_compound_stmt (inner_then_clause
);
8210 finish_then_clause (inner_if_stmt
);
8211 finish_if_stmt (inner_if_stmt
);
8214 finish_compound_stmt (then_clause
);
8215 finish_then_clause (if_stmt
);
8216 finish_if_stmt (if_stmt
);
8218 else if (CP_DECL_THREAD_LOCAL_P (decl
))
8219 tls_aggregates
= tree_cons (init
, decl
, tls_aggregates
);
8221 static_aggregates
= tree_cons (init
, decl
, static_aggregates
);
8225 /* Make TYPE a complete type based on INITIAL_VALUE.
8226 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
8227 2 if there was no information (in which case assume 0 if DO_DEFAULT),
8228 3 if the initializer list is empty (in pedantic mode). */
8231 cp_complete_array_type (tree
*ptype
, tree initial_value
, bool do_default
)
8234 tree type
, elt_type
;
8236 /* Don't get confused by a CONSTRUCTOR for some other type. */
8237 if (initial_value
&& TREE_CODE (initial_value
) == CONSTRUCTOR
8238 && !BRACE_ENCLOSED_INITIALIZER_P (initial_value
)
8239 && TREE_CODE (TREE_TYPE (initial_value
)) != ARRAY_TYPE
)
8244 unsigned HOST_WIDE_INT i
;
8247 /* An array of character type can be initialized from a
8248 brace-enclosed string constant.
8250 FIXME: this code is duplicated from reshape_init. Probably
8251 we should just call reshape_init here? */
8252 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype
)))
8253 && TREE_CODE (initial_value
) == CONSTRUCTOR
8254 && !vec_safe_is_empty (CONSTRUCTOR_ELTS (initial_value
)))
8256 vec
<constructor_elt
, va_gc
> *v
= CONSTRUCTOR_ELTS (initial_value
);
8257 tree value
= (*v
)[0].value
;
8259 if (TREE_CODE (value
) == STRING_CST
8260 && v
->length () == 1)
8261 initial_value
= value
;
8264 /* If any of the elements are parameter packs, we can't actually
8265 complete this type now because the array size is dependent. */
8266 if (TREE_CODE (initial_value
) == CONSTRUCTOR
)
8268 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value
),
8271 if (PACK_EXPANSION_P (value
))
8277 failure
= complete_array_type (ptype
, initial_value
, do_default
);
8279 /* We can create the array before the element type is complete, which
8280 means that we didn't have these two bits set in the original type
8281 either. In completing the type, we are expected to propagate these
8282 bits. See also complete_type which does the same thing for arrays
8285 if (TYPE_DOMAIN (type
))
8287 elt_type
= TREE_TYPE (type
);
8288 TYPE_NEEDS_CONSTRUCTING (type
) = TYPE_NEEDS_CONSTRUCTING (elt_type
);
8289 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
)
8290 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type
);
8296 /* As above, but either give an error or reject zero-size arrays, depending
8300 cp_complete_array_type_or_error (tree
*ptype
, tree initial_value
,
8301 bool do_default
, tsubst_flags_t complain
)
8304 bool sfinae
= !(complain
& tf_error
);
8305 /* In SFINAE context we can't be lenient about zero-size arrays. */
8308 failure
= cp_complete_array_type (ptype
, initial_value
, do_default
);
8314 /* Not an error. */;
8315 else if (failure
== 1)
8316 error ("initializer fails to determine size of %qT", *ptype
);
8317 else if (failure
== 2)
8320 error ("array size missing in %qT", *ptype
);
8322 else if (failure
== 3)
8323 error ("zero-size array %qT", *ptype
);
8324 *ptype
= error_mark_node
;
8329 /* Return zero if something is declared to be a member of type
8330 CTYPE when in the context of CUR_TYPE. STRING is the error
8331 message to print in that case. Otherwise, quietly return 1. */
8334 member_function_or_else (tree ctype
, tree cur_type
, enum overload_flags flags
)
8336 if (ctype
&& ctype
!= cur_type
)
8338 if (flags
== DTOR_FLAG
)
8339 error ("destructor for alien class %qT cannot be a member", ctype
);
8341 error ("constructor for alien class %qT cannot be a member", ctype
);
8347 /* Subroutine of `grokdeclarator'. */
8349 /* Generate errors possibly applicable for a given set of specifiers.
8350 This is for ARM $7.1.2. */
8353 bad_specifiers (tree object
,
8354 enum bad_spec_place type
,
8365 error ("%qD declared as a %<virtual%> variable", object
);
8367 error ("%<const%> and %<volatile%> function specifiers on "
8368 "%qD invalid in variable declaration", object
);
8372 error ("%qD declared as a %<virtual%> parameter", object
);
8374 error ("%qD declared as an %<inline%> parameter", object
);
8376 error ("%<const%> and %<volatile%> function specifiers on "
8377 "%qD invalid in parameter declaration", object
);
8381 error ("%qD declared as a %<virtual%> type", object
);
8383 error ("%qD declared as an %<inline%> type", object
);
8385 error ("%<const%> and %<volatile%> function specifiers on "
8386 "%qD invalid in type declaration", object
);
8390 error ("%qD declared as a %<virtual%> field", object
);
8392 error ("%qD declared as an %<inline%> field", object
);
8394 error ("%<const%> and %<volatile%> function specifiers on "
8395 "%qD invalid in field declaration", object
);
8401 error ("%q+D declared as a friend", object
);
8403 && !flag_noexcept_type
8404 && (TREE_CODE (object
) == TYPE_DECL
8405 || (!TYPE_PTRFN_P (TREE_TYPE (object
))
8406 && !TYPE_REFFN_P (TREE_TYPE (object
))
8407 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object
)))))
8408 error ("%q+D declared with an exception specification", object
);
8411 /* DECL is a member function or static data member and is presently
8412 being defined. Check that the definition is taking place in a
8416 check_class_member_definition_namespace (tree decl
)
8418 /* These checks only apply to member functions and static data
8420 gcc_assert (VAR_OR_FUNCTION_DECL_P (decl
));
8421 /* We check for problems with specializations in pt.c in
8422 check_specialization_namespace, where we can issue better
8424 if (processing_specialization
)
8426 /* We check this in check_explicit_instantiation_namespace. */
8427 if (processing_explicit_instantiation
)
8431 A member function definition that appears outside of the
8432 class definition shall appear in a namespace scope enclosing
8433 the class definition.
8437 The definition for a static data member shall appear in a
8438 namespace scope enclosing the member's class definition. */
8439 if (!is_ancestor (current_namespace
, DECL_CONTEXT (decl
)))
8440 permerror (input_location
, "definition of %qD is not in namespace enclosing %qT",
8441 decl
, DECL_CONTEXT (decl
));
8444 /* Build a PARM_DECL for the "this" parameter of FN. TYPE is the
8445 METHOD_TYPE for a non-static member function; QUALS are the
8446 cv-qualifiers that apply to the function. */
8449 build_this_parm (tree fn
, tree type
, cp_cv_quals quals
)
8454 cp_cv_quals this_quals
;
8456 if (CLASS_TYPE_P (type
))
8459 = cp_build_qualified_type (type
, quals
& ~TYPE_QUAL_RESTRICT
);
8460 this_type
= build_pointer_type (this_type
);
8463 this_type
= type_of_this_parm (type
);
8464 /* The `this' parameter is implicitly `const'; it cannot be
8466 this_quals
= (quals
& TYPE_QUAL_RESTRICT
) | TYPE_QUAL_CONST
;
8467 qual_type
= cp_build_qualified_type (this_type
, this_quals
);
8468 parm
= build_artificial_parm (fn
, this_identifier
, qual_type
);
8469 cp_apply_type_quals_to_decl (this_quals
, parm
);
8473 /* DECL is a static member function. Complain if it was declared
8474 with function-cv-quals. */
8477 check_static_quals (tree decl
, cp_cv_quals quals
)
8479 if (quals
!= TYPE_UNQUALIFIED
)
8480 error ("static member function %q#D declared with type qualifiers",
8484 // Check that FN takes no arguments and returns bool.
8486 check_concept_fn (tree fn
)
8488 // A constraint is nullary.
8489 if (DECL_ARGUMENTS (fn
))
8490 error ("concept %q#D declared with function parameters", fn
);
8492 // The declared return type of the concept shall be bool, and
8493 // it shall not be deduced from it definition.
8494 tree type
= TREE_TYPE (TREE_TYPE (fn
));
8496 error ("concept %q#D declared with a deduced return type", fn
);
8497 else if (type
!= boolean_type_node
)
8498 error ("concept %q#D with non-%<bool%> return type %qT", fn
, type
);
8501 /* Helper function. Replace the temporary this parameter injected
8502 during cp_finish_omp_declare_simd with the real this parameter. */
8505 declare_simd_adjust_this (tree
*tp
, int *walk_subtrees
, void *data
)
8507 tree this_parm
= (tree
) data
;
8508 if (TREE_CODE (*tp
) == PARM_DECL
8509 && DECL_NAME (*tp
) == this_identifier
8510 && *tp
!= this_parm
)
8512 else if (TYPE_P (*tp
))
8517 /* CTYPE is class type, or null if non-class.
8518 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
8520 DECLARATOR is the function's name.
8521 PARMS is a chain of PARM_DECLs for the function.
8522 VIRTUALP is truthvalue of whether the function is virtual or not.
8523 FLAGS are to be passed through to `grokclassfn'.
8524 QUALS are qualifiers indicating whether the function is `const'
8526 RAISES is a list of exceptions that this function can raise.
8527 CHECK is 1 if we must find this method in CTYPE, 0 if we should
8528 not look, and -1 if we should not call `grokclassfn' at all.
8530 SFK is the kind of special function (if any) for the new function.
8532 Returns `NULL_TREE' if something goes wrong, after issuing
8533 applicable error messages. */
8536 grokfndecl (tree ctype
,
8540 tree orig_declarator
,
8543 enum overload_flags flags
,
8545 cp_ref_qualifier rqual
,
8552 special_function_kind sfk
,
8557 location_t location
)
8560 int staticp
= ctype
&& TREE_CODE (type
) == FUNCTION_TYPE
;
8563 // Was the concept specifier present?
8564 bool concept_p
= inlinep
& 4;
8566 // Concept declarations must have a corresponding definition.
8567 if (concept_p
&& !funcdef_flag
)
8569 error ("concept %qD has no definition", declarator
);
8574 type
= build_ref_qualified_type (type
, rqual
);
8576 type
= build_exception_variant (type
, raises
);
8578 decl
= build_lang_decl (FUNCTION_DECL
, declarator
, type
);
8580 /* Set the constraints on the declaration. */
8583 tree tmpl_reqs
= NULL_TREE
;
8584 if (processing_template_decl
> template_class_depth (ctype
))
8585 tmpl_reqs
= TEMPLATE_PARMS_CONSTRAINTS (current_template_parms
);
8587 /* Adjust the required expression into a constraint. */
8589 decl_reqs
= normalize_expression (decl_reqs
);
8591 tree ci
= build_constraints (tmpl_reqs
, decl_reqs
);
8592 set_constraints (decl
, ci
);
8595 /* If we have an explicit location, use it, otherwise use whatever
8596 build_lang_decl used (probably input_location). */
8597 if (location
!= UNKNOWN_LOCATION
)
8598 DECL_SOURCE_LOCATION (decl
) = location
;
8600 if (TREE_CODE (type
) == METHOD_TYPE
)
8602 tree parm
= build_this_parm (decl
, type
, quals
);
8603 DECL_CHAIN (parm
) = parms
;
8606 /* Allocate space to hold the vptr bit if needed. */
8607 SET_DECL_ALIGN (decl
, MINIMUM_METHOD_BOUNDARY
);
8610 DECL_ARGUMENTS (decl
) = parms
;
8611 for (t
= parms
; t
; t
= DECL_CHAIN (t
))
8612 DECL_CONTEXT (t
) = decl
;
8614 /* Propagate volatile out from type to decl. */
8615 if (TYPE_VOLATILE (type
))
8616 TREE_THIS_VOLATILE (decl
) = 1;
8618 /* Setup decl according to sfk. */
8621 case sfk_constructor
:
8622 case sfk_copy_constructor
:
8623 case sfk_move_constructor
:
8624 DECL_CXX_CONSTRUCTOR_P (decl
) = 1;
8625 DECL_NAME (decl
) = ctor_identifier
;
8627 case sfk_destructor
:
8628 DECL_CXX_DESTRUCTOR_P (decl
) = 1;
8629 DECL_NAME (decl
) = dtor_identifier
;
8635 if (friendp
&& TREE_CODE (orig_declarator
) == TEMPLATE_ID_EXPR
)
8638 error ("defining explicit specialization %qD in friend declaration",
8642 tree fns
= TREE_OPERAND (orig_declarator
, 0);
8643 tree args
= TREE_OPERAND (orig_declarator
, 1);
8645 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
8647 /* Something like `template <class T> friend void f<T>()'. */
8648 error ("invalid use of template-id %qD in declaration "
8649 "of primary template",
8655 /* A friend declaration of the form friend void f<>(). Record
8656 the information in the TEMPLATE_ID_EXPR. */
8657 SET_DECL_IMPLICIT_INSTANTIATION (decl
);
8659 gcc_assert (identifier_p (fns
) || TREE_CODE (fns
) == OVERLOAD
);
8660 DECL_TEMPLATE_INFO (decl
) = build_template_info (fns
, args
);
8662 for (t
= TYPE_ARG_TYPES (TREE_TYPE (decl
)); t
; t
= TREE_CHAIN (t
))
8663 if (TREE_PURPOSE (t
)
8664 && TREE_CODE (TREE_PURPOSE (t
)) == DEFAULT_ARG
)
8666 error ("default arguments are not allowed in declaration "
8667 "of friend template specialization %qD",
8674 error ("%<inline%> is not allowed in declaration of friend "
8675 "template specialization %qD",
8682 /* If this decl has namespace scope, set that up. */
8684 set_decl_namespace (decl
, in_namespace
, friendp
);
8686 DECL_CONTEXT (decl
) = FROB_CONTEXT (current_decl_namespace ());
8688 /* `main' and builtins have implicit 'C' linkage. */
8689 if (ctype
== NULL_TREE
8690 && DECL_FILE_SCOPE_P (decl
)
8691 && current_lang_name
== lang_name_cplusplus
8692 && (MAIN_NAME_P (declarator
)
8693 || (IDENTIFIER_LENGTH (declarator
) > 10
8694 && IDENTIFIER_POINTER (declarator
)[0] == '_'
8695 && IDENTIFIER_POINTER (declarator
)[1] == '_'
8696 && strncmp (IDENTIFIER_POINTER (declarator
)+2,
8697 "builtin_", 8) == 0)
8698 || (targetcm
.cxx_implicit_extern_c
8699 && (targetcm
.cxx_implicit_extern_c
8700 (IDENTIFIER_POINTER (declarator
))))))
8701 SET_DECL_LANGUAGE (decl
, lang_c
);
8703 /* Should probably propagate const out from type to decl I bet (mrs). */
8706 DECL_STATIC_FUNCTION_P (decl
) = 1;
8707 DECL_CONTEXT (decl
) = ctype
;
8711 DECL_DELETED_FN (decl
) = 1;
8715 DECL_CONTEXT (decl
) = ctype
;
8717 check_class_member_definition_namespace (decl
);
8720 if (ctype
== NULL_TREE
&& DECL_MAIN_P (decl
))
8722 if (PROCESSING_REAL_TEMPLATE_DECL_P())
8723 error ("cannot declare %<::main%> to be a template");
8725 error ("cannot declare %<::main%> to be inline");
8727 error ("cannot declare %<::main%> to be %<constexpr%>");
8729 error ("cannot declare %<::main%> to be static");
8734 /* Members of anonymous types and local classes have no linkage; make
8735 them internal. If a typedef is made later, this will be changed. */
8736 if (ctype
&& (!TREE_PUBLIC (TYPE_MAIN_DECL (ctype
))
8737 || decl_function_context (TYPE_MAIN_DECL (ctype
))))
8740 if (publicp
&& cxx_dialect
== cxx98
)
8742 /* [basic.link]: A name with no linkage (notably, the name of a class
8743 or enumeration declared in a local scope) shall not be used to
8744 declare an entity with linkage.
8746 DR 757 relaxes this restriction for C++0x. */
8747 no_linkage_error (decl
);
8750 TREE_PUBLIC (decl
) = publicp
;
8753 DECL_INTERFACE_KNOWN (decl
) = 1;
8754 DECL_NOT_REALLY_EXTERN (decl
) = 1;
8757 /* If the declaration was declared inline, mark it as such. */
8760 DECL_DECLARED_INLINE_P (decl
) = 1;
8762 DECL_COMDAT (decl
) = 1;
8765 DECL_DECLARED_CONSTEXPR_P (decl
) = true;
8767 // If the concept declaration specifier was found, check
8768 // that the declaration satisfies the necessary requirements.
8771 DECL_DECLARED_CONCEPT_P (decl
) = true;
8772 check_concept_fn (decl
);
8775 DECL_EXTERNAL (decl
) = 1;
8776 if (TREE_CODE (type
) == FUNCTION_TYPE
)
8779 TREE_TYPE (decl
) = apply_memfn_quals (TREE_TYPE (decl
),
8786 ? G_("static member function %qD cannot have cv-qualifier")
8787 : G_("non-member function %qD cannot have cv-qualifier"),
8789 quals
= TYPE_UNQUALIFIED
;
8795 ? G_("static member function %qD cannot have ref-qualifier")
8796 : G_("non-member function %qD cannot have ref-qualifier"),
8798 rqual
= REF_QUAL_NONE
;
8802 if (deduction_guide_p (decl
))
8804 if (!DECL_NAMESPACE_SCOPE_P (decl
))
8806 error_at (location
, "deduction guide %qD must be declared at "
8807 "namespace scope", decl
);
8812 "deduction guide %qD must not have a function body", decl
);
8814 else if (IDENTIFIER_ANY_OP_P (DECL_NAME (decl
))
8815 && !grok_op_properties (decl
, /*complain=*/true))
8817 else if (UDLIT_OPER_P (DECL_NAME (decl
)))
8819 bool long_long_unsigned_p
;
8821 const char *suffix
= NULL
;
8822 /* [over.literal]/6: Literal operators shall not have C linkage. */
8823 if (DECL_LANGUAGE (decl
) == lang_c
)
8825 error ("literal operator with C linkage");
8826 maybe_show_extern_c_location ();
8830 if (DECL_NAMESPACE_SCOPE_P (decl
))
8832 if (!check_literal_operator_args (decl
, &long_long_unsigned_p
,
8835 error ("%qD has invalid argument list", decl
);
8839 suffix
= UDLIT_OP_SUFFIX (DECL_NAME (decl
));
8840 if (long_long_unsigned_p
)
8842 if (cpp_interpret_int_suffix (parse_in
, suffix
, strlen (suffix
)))
8843 warning (0, "integer suffix %qs"
8844 " shadowed by implementation", suffix
);
8846 else if (long_double_p
)
8848 if (cpp_interpret_float_suffix (parse_in
, suffix
, strlen (suffix
)))
8849 warning (0, "floating point suffix %qs"
8850 " shadowed by implementation", suffix
);
8855 error ("%qD must be a non-member function", decl
);
8861 /* Make the init_value nonzero so pushdecl knows this is not
8862 tentative. error_mark_node is replaced later with the BLOCK. */
8863 DECL_INITIAL (decl
) = error_mark_node
;
8865 if (TYPE_NOTHROW_P (type
) || nothrow_libfn_p (decl
))
8866 TREE_NOTHROW (decl
) = 1;
8868 if (flag_openmp
|| flag_openmp_simd
)
8870 /* Adjust "omp declare simd" attributes. */
8871 tree ods
= lookup_attribute ("omp declare simd", *attrlist
);
8875 for (attr
= ods
; attr
;
8876 attr
= lookup_attribute ("omp declare simd", TREE_CHAIN (attr
)))
8878 if (TREE_CODE (type
) == METHOD_TYPE
)
8879 walk_tree (&TREE_VALUE (attr
), declare_simd_adjust_this
,
8880 DECL_ARGUMENTS (decl
), NULL
);
8881 if (TREE_VALUE (attr
) != NULL_TREE
)
8883 tree cl
= TREE_VALUE (TREE_VALUE (attr
));
8884 cl
= c_omp_declare_simd_clauses_to_numbers
8885 (DECL_ARGUMENTS (decl
), cl
);
8887 TREE_VALUE (TREE_VALUE (attr
)) = cl
;
8889 TREE_VALUE (attr
) = NULL_TREE
;
8895 /* Caller will do the rest of this. */
8899 if (ctype
!= NULL_TREE
)
8900 grokclassfn (ctype
, decl
, flags
);
8903 if (cxx_dialect
>= cxx11
8904 && DECL_DESTRUCTOR_P (decl
)
8905 && !TYPE_BEING_DEFINED (DECL_CONTEXT (decl
))
8906 && !processing_template_decl
)
8907 deduce_noexcept_on_destructor (decl
);
8909 decl
= check_explicit_specialization (orig_declarator
, decl
,
8912 4 * (friendp
!= 0) +
8914 if (decl
== error_mark_node
)
8917 if (DECL_STATIC_FUNCTION_P (decl
))
8918 check_static_quals (decl
, quals
);
8922 cplus_decl_attributes (&decl
, *attrlist
, 0);
8923 *attrlist
= NULL_TREE
;
8926 /* Check main's type after attributes have been applied. */
8927 if (ctype
== NULL_TREE
&& DECL_MAIN_P (decl
))
8929 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl
)),
8932 tree oldtypeargs
= TYPE_ARG_TYPES (TREE_TYPE (decl
));
8934 error ("%<::main%> must return %<int%>");
8935 newtype
= build_function_type (integer_type_node
, oldtypeargs
);
8936 TREE_TYPE (decl
) = newtype
;
8939 check_main_parameter_types (decl
);
8942 if (ctype
!= NULL_TREE
&& check
)
8944 tree old_decl
= check_classfn (ctype
, decl
,
8945 (processing_template_decl
8946 > template_class_depth (ctype
))
8947 ? current_template_parms
8950 if (old_decl
== error_mark_node
)
8958 if (TREE_CODE (old_decl
) == TEMPLATE_DECL
)
8959 /* Because grokfndecl is always supposed to return a
8960 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
8961 here. We depend on our callers to figure out that its
8962 really a template that's being returned. */
8963 old_decl
= DECL_TEMPLATE_RESULT (old_decl
);
8965 if (DECL_STATIC_FUNCTION_P (old_decl
)
8966 && TREE_CODE (TREE_TYPE (decl
)) == METHOD_TYPE
)
8968 /* Remove the `this' parm added by grokclassfn. */
8969 revert_static_member_fn (decl
);
8970 check_static_quals (decl
, quals
);
8972 if (DECL_ARTIFICIAL (old_decl
))
8974 error ("definition of implicitly-declared %qD", old_decl
);
8977 else if (DECL_DEFAULTED_FN (old_decl
))
8979 error ("definition of explicitly-defaulted %q+D", decl
);
8980 inform (DECL_SOURCE_LOCATION (old_decl
),
8981 "%q#D explicitly defaulted here", old_decl
);
8985 /* Since we've smashed OLD_DECL to its
8986 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
8987 if (TREE_CODE (decl
) == TEMPLATE_DECL
)
8988 decl
= DECL_TEMPLATE_RESULT (decl
);
8990 /* Attempt to merge the declarations. This can fail, in
8991 the case of some invalid specialization declarations. */
8992 pushed_scope
= push_scope (ctype
);
8993 ok
= duplicate_decls (decl
, old_decl
, friendp
);
8995 pop_scope (pushed_scope
);
8998 error ("no %q#D member function declared in class %qT",
9002 if (ok
== error_mark_node
)
9008 if (DECL_CONSTRUCTOR_P (decl
) && !grok_ctor_properties (ctype
, decl
))
9011 if (ctype
== NULL_TREE
|| check
)
9015 DECL_VIRTUAL_P (decl
) = 1;
9020 /* decl is a FUNCTION_DECL.
9021 specifiers are the parsed virt-specifiers.
9023 Set flags to reflect the virt-specifiers.
9028 set_virt_specifiers (tree decl
, cp_virt_specifiers specifiers
)
9030 if (decl
== NULL_TREE
)
9032 if (specifiers
& VIRT_SPEC_OVERRIDE
)
9033 DECL_OVERRIDE_P (decl
) = 1;
9034 if (specifiers
& VIRT_SPEC_FINAL
)
9035 DECL_FINAL_P (decl
) = 1;
9039 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
9040 the linkage that DECL will receive in the object file. */
9043 set_linkage_for_static_data_member (tree decl
)
9045 /* A static data member always has static storage duration and
9046 external linkage. Note that static data members are forbidden in
9047 local classes -- the only situation in which a class has
9048 non-external linkage. */
9049 TREE_PUBLIC (decl
) = 1;
9050 TREE_STATIC (decl
) = 1;
9051 /* For non-template classes, static data members are always put
9052 out in exactly those files where they are defined, just as
9053 with ordinary namespace-scope variables. */
9054 if (!processing_template_decl
)
9055 DECL_INTERFACE_KNOWN (decl
) = 1;
9058 /* Create a VAR_DECL named NAME with the indicated TYPE.
9060 If SCOPE is non-NULL, it is the class type or namespace containing
9061 the variable. If SCOPE is NULL, the variable should is created in
9062 the innermost enclosing scope. */
9065 grokvardecl (tree type
,
9067 tree orig_declarator
,
9068 const cp_decl_specifier_seq
*declspecs
,
9077 tree explicit_scope
;
9079 gcc_assert (!name
|| identifier_p (name
));
9081 bool constp
= (type_quals
& TYPE_QUAL_CONST
) != 0;
9082 bool volatilep
= (type_quals
& TYPE_QUAL_VOLATILE
) != 0;
9084 /* Compute the scope in which to place the variable, but remember
9085 whether or not that scope was explicitly specified by the user. */
9086 explicit_scope
= scope
;
9089 /* An explicit "extern" specifier indicates a namespace-scope
9091 if (declspecs
->storage_class
== sc_extern
)
9092 scope
= current_decl_namespace ();
9093 else if (!at_function_scope_p ())
9094 scope
= current_scope ();
9098 && (/* If the variable is a namespace-scope variable declared in a
9099 template, we need DECL_LANG_SPECIFIC. */
9100 (TREE_CODE (scope
) == NAMESPACE_DECL
&& processing_template_decl
)
9101 /* Similarly for namespace-scope variables with language linkage
9103 || (TREE_CODE (scope
) == NAMESPACE_DECL
9104 && current_lang_name
!= lang_name_cplusplus
)
9105 /* Similarly for static data members. */
9107 /* Similarly for explicit specializations. */
9109 && TREE_CODE (orig_declarator
) == TEMPLATE_ID_EXPR
)))
9110 decl
= build_lang_decl (VAR_DECL
, name
, type
);
9112 decl
= build_decl (input_location
, VAR_DECL
, name
, type
);
9114 if (explicit_scope
&& TREE_CODE (explicit_scope
) == NAMESPACE_DECL
)
9115 set_decl_namespace (decl
, explicit_scope
, 0);
9117 DECL_CONTEXT (decl
) = FROB_CONTEXT (scope
);
9119 if (declspecs
->storage_class
== sc_extern
)
9121 DECL_THIS_EXTERN (decl
) = 1;
9122 DECL_EXTERNAL (decl
) = !initialized
;
9125 if (DECL_CLASS_SCOPE_P (decl
))
9127 set_linkage_for_static_data_member (decl
);
9128 /* This function is only called with out-of-class definitions. */
9129 DECL_EXTERNAL (decl
) = 0;
9130 check_class_member_definition_namespace (decl
);
9132 /* At top level, either `static' or no s.c. makes a definition
9133 (perhaps tentative), and absence of `static' makes it public. */
9134 else if (toplevel_bindings_p ())
9136 TREE_PUBLIC (decl
) = (declspecs
->storage_class
!= sc_static
9137 && (DECL_THIS_EXTERN (decl
)
9141 TREE_STATIC (decl
) = ! DECL_EXTERNAL (decl
);
9143 /* Not at top level, only `static' makes a static definition. */
9146 TREE_STATIC (decl
) = declspecs
->storage_class
== sc_static
;
9147 TREE_PUBLIC (decl
) = DECL_EXTERNAL (decl
);
9150 if (decl_spec_seq_has_spec_p (declspecs
, ds_thread
))
9152 if (DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
9154 CP_DECL_THREAD_LOCAL_P (decl
) = true;
9155 if (!processing_template_decl
)
9156 set_decl_tls_model (decl
, decl_default_tls_model (decl
));
9158 if (declspecs
->gnu_thread_keyword_p
)
9159 SET_DECL_GNU_TLS_P (decl
);
9162 /* If the type of the decl has no linkage, make sure that we'll
9163 notice that in mark_used. */
9164 if (cxx_dialect
> cxx98
9165 && decl_linkage (decl
) != lk_none
9166 && DECL_LANG_SPECIFIC (decl
) == NULL
9167 && !DECL_EXTERN_C_P (decl
)
9168 && no_linkage_check (TREE_TYPE (decl
), /*relaxed_p=*/false))
9169 retrofit_lang_decl (decl
);
9171 if (TREE_PUBLIC (decl
))
9173 /* [basic.link]: A name with no linkage (notably, the name of a class
9174 or enumeration declared in a local scope) shall not be used to
9175 declare an entity with linkage.
9177 DR 757 relaxes this restriction for C++0x. */
9178 if (cxx_dialect
< cxx11
)
9179 no_linkage_error (decl
);
9182 DECL_INTERFACE_KNOWN (decl
) = 1;
9184 if (DECL_NAME (decl
)
9185 && MAIN_NAME_P (DECL_NAME (decl
))
9186 && scope
== global_namespace
)
9187 error ("cannot declare %<::main%> to be a global variable");
9189 /* Check that the variable can be safely declared as a concept.
9190 Note that this also forbids explicit specializations. */
9193 if (!processing_template_decl
)
9195 error ("a non-template variable cannot be %<concept%>");
9199 DECL_DECLARED_CONCEPT_P (decl
) = true;
9200 if (!same_type_ignoring_top_level_qualifiers_p (type
, boolean_type_node
))
9201 error_at (declspecs
->locations
[ds_type_spec
],
9202 "concept must have type %<bool%>");
9204 else if (flag_concepts
9205 && processing_template_decl
> template_class_depth (scope
))
9207 tree reqs
= TEMPLATE_PARMS_CONSTRAINTS (current_template_parms
);
9208 tree ci
= build_constraints (reqs
, NULL_TREE
);
9209 set_constraints (decl
, ci
);
9212 // Handle explicit specializations and instantiations of variable templates.
9213 if (orig_declarator
)
9214 decl
= check_explicit_specialization (orig_declarator
, decl
,
9215 template_count
, conceptp
* 8);
9217 return decl
!= error_mark_node
? decl
: NULL_TREE
;
9220 /* Create and return a canonical pointer to member function type, for
9221 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
9224 build_ptrmemfunc_type (tree type
)
9229 if (type
== error_mark_node
)
9232 /* Make sure that we always have the unqualified pointer-to-member
9234 if (cp_cv_quals quals
= cp_type_quals (type
))
9236 tree unqual
= build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type
));
9237 return cp_build_qualified_type (unqual
, quals
);
9240 /* If a canonical type already exists for this type, use it. We use
9241 this method instead of type_hash_canon, because it only does a
9242 simple equality check on the list of field members. */
9244 t
= TYPE_PTRMEMFUNC_TYPE (type
);
9248 t
= make_node (RECORD_TYPE
);
9250 /* Let the front end know this is a pointer to member function. */
9251 TYPE_PTRMEMFUNC_FLAG (t
) = 1;
9253 field
= build_decl (input_location
, FIELD_DECL
, pfn_identifier
, type
);
9256 field
= build_decl (input_location
, FIELD_DECL
, delta_identifier
,
9258 DECL_CHAIN (field
) = fields
;
9261 finish_builtin_struct (t
, "__ptrmemfunc_type", fields
, ptr_type_node
);
9263 /* Zap out the name so that the back end will give us the debugging
9264 information for this anonymous RECORD_TYPE. */
9265 TYPE_NAME (t
) = NULL_TREE
;
9267 /* Cache this pointer-to-member type so that we can find it again
9269 TYPE_PTRMEMFUNC_TYPE (type
) = t
;
9271 if (TYPE_STRUCTURAL_EQUALITY_P (type
))
9272 SET_TYPE_STRUCTURAL_EQUALITY (t
);
9273 else if (TYPE_CANONICAL (type
) != type
)
9274 TYPE_CANONICAL (t
) = build_ptrmemfunc_type (TYPE_CANONICAL (type
));
9279 /* Create and return a pointer to data member type. */
9282 build_ptrmem_type (tree class_type
, tree member_type
)
9284 if (TREE_CODE (member_type
) == METHOD_TYPE
)
9286 cp_cv_quals quals
= type_memfn_quals (member_type
);
9287 cp_ref_qualifier rqual
= type_memfn_rqual (member_type
);
9288 member_type
= build_memfn_type (member_type
, class_type
, quals
, rqual
);
9289 return build_ptrmemfunc_type (build_pointer_type (member_type
));
9293 gcc_assert (TREE_CODE (member_type
) != FUNCTION_TYPE
);
9294 return build_offset_type (class_type
, member_type
);
9298 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
9299 Check to see that the definition is valid. Issue appropriate error
9300 messages. Return 1 if the definition is particularly bad, or 0
9304 check_static_variable_definition (tree decl
, tree type
)
9306 /* Avoid redundant diagnostics on out-of-class definitions. */
9307 if (!current_class_type
|| !TYPE_BEING_DEFINED (current_class_type
))
9309 /* Can't check yet if we don't know the type. */
9310 if (dependent_type_p (type
))
9312 /* If DECL is declared constexpr, we'll do the appropriate checks
9313 in check_initializer. Similarly for inline static data members. */
9315 && (DECL_DECLARED_CONSTEXPR_P (decl
)
9316 || DECL_VAR_DECLARED_INLINE_P (decl
)))
9318 else if (cxx_dialect
>= cxx11
&& !INTEGRAL_OR_ENUMERATION_TYPE_P (type
))
9320 if (!COMPLETE_TYPE_P (type
))
9321 error_at (DECL_SOURCE_LOCATION (decl
),
9322 "in-class initialization of static data member %q#D of "
9323 "incomplete type", decl
);
9324 else if (literal_type_p (type
))
9325 permerror (DECL_SOURCE_LOCATION (decl
),
9326 "%<constexpr%> needed for in-class initialization of "
9327 "static data member %q#D of non-integral type", decl
);
9329 error_at (DECL_SOURCE_LOCATION (decl
),
9330 "in-class initialization of static data member %q#D of "
9331 "non-literal type", decl
);
9335 /* Motion 10 at San Diego: If a static const integral data member is
9336 initialized with an integral constant expression, the initializer
9337 may appear either in the declaration (within the class), or in
9338 the definition, but not both. If it appears in the class, the
9339 member is a member constant. The file-scope definition is always
9341 if (!ARITHMETIC_TYPE_P (type
) && TREE_CODE (type
) != ENUMERAL_TYPE
)
9343 error_at (DECL_SOURCE_LOCATION (decl
),
9344 "invalid in-class initialization of static data member "
9345 "of non-integral type %qT",
9349 else if (!CP_TYPE_CONST_P (type
))
9350 error_at (DECL_SOURCE_LOCATION (decl
),
9351 "ISO C++ forbids in-class initialization of non-const "
9352 "static member %qD",
9354 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type
))
9355 pedwarn (DECL_SOURCE_LOCATION (decl
), OPT_Wpedantic
,
9356 "ISO C++ forbids initialization of member constant "
9357 "%qD of non-integral type %qT", decl
, type
);
9362 /* *expr_p is part of the TYPE_SIZE of a variably-sized array. If any
9363 SAVE_EXPRs in *expr_p wrap expressions with side-effects, break those
9364 expressions out into temporary variables so that walk_tree doesn't
9365 step into them (c++/15764). */
9368 stabilize_save_expr_r (tree
*expr_p
, int *walk_subtrees
, void *data
)
9370 hash_set
<tree
> *pset
= (hash_set
<tree
> *)data
;
9371 tree expr
= *expr_p
;
9372 if (TREE_CODE (expr
) == SAVE_EXPR
)
9374 tree op
= TREE_OPERAND (expr
, 0);
9375 cp_walk_tree (&op
, stabilize_save_expr_r
, data
, pset
);
9376 if (TREE_SIDE_EFFECTS (op
))
9377 TREE_OPERAND (expr
, 0) = get_temp_regvar (TREE_TYPE (op
), op
);
9380 else if (!EXPR_P (expr
) || !TREE_SIDE_EFFECTS (expr
))
9385 /* Entry point for the above. */
9388 stabilize_vla_size (tree size
)
9390 hash_set
<tree
> pset
;
9391 /* Break out any function calls into temporary variables. */
9392 cp_walk_tree (&size
, stabilize_save_expr_r
, &pset
, &pset
);
9395 /* Reduce a SIZEOF_EXPR to its value. */
9398 fold_sizeof_expr (tree t
)
9401 if (SIZEOF_EXPR_TYPE_P (t
))
9402 r
= cxx_sizeof_or_alignof_type (TREE_TYPE (TREE_OPERAND (t
, 0)),
9403 SIZEOF_EXPR
, false);
9404 else if (TYPE_P (TREE_OPERAND (t
, 0)))
9405 r
= cxx_sizeof_or_alignof_type (TREE_OPERAND (t
, 0), SIZEOF_EXPR
,
9408 r
= cxx_sizeof_or_alignof_expr (TREE_OPERAND (t
, 0), SIZEOF_EXPR
,
9410 if (r
== error_mark_node
)
9415 /* Given the SIZE (i.e., number of elements) in an array, compute
9416 an appropriate index type for the array. If non-NULL, NAME is
9417 the name of the entity being declared. */
9420 compute_array_index_type (tree name
, tree size
, tsubst_flags_t complain
)
9425 if (error_operand_p (size
))
9426 return error_mark_node
;
9428 if (!type_dependent_expression_p (size
))
9430 tree type
= TREE_TYPE (size
);
9432 size
= mark_rvalue_use (size
);
9434 if (cxx_dialect
< cxx11
&& TREE_CODE (size
) == NOP_EXPR
9435 && TREE_SIDE_EFFECTS (size
))
9436 /* In C++98, we mark a non-constant array bound with a magic
9437 NOP_EXPR with TREE_SIDE_EFFECTS; don't fold in that case. */;
9440 size
= instantiate_non_dependent_expr_sfinae (size
, complain
);
9442 if (CLASS_TYPE_P (type
)
9443 && CLASSTYPE_LITERAL_P (type
))
9445 size
= build_expr_type_conversion (WANT_INT
, size
, true);
9448 if (!(complain
& tf_error
))
9449 return error_mark_node
;
9451 error ("size of array %qD has non-integral type %qT",
9454 error ("size of array has non-integral type %qT", type
);
9455 size
= integer_one_node
;
9457 if (size
== error_mark_node
)
9458 return error_mark_node
;
9459 type
= TREE_TYPE (size
);
9462 if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type
))
9463 size
= maybe_constant_value (size
);
9465 if (!TREE_CONSTANT (size
))
9469 if (error_operand_p (size
))
9470 return error_mark_node
;
9472 /* The array bound must be an integer type. */
9473 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type
))
9475 if (!(complain
& tf_error
))
9476 return error_mark_node
;
9478 error ("size of array %qD has non-integral type %qT", name
, type
);
9480 error ("size of array has non-integral type %qT", type
);
9481 size
= integer_one_node
;
9482 type
= TREE_TYPE (size
);
9486 /* A type is dependent if it is...an array type constructed from any
9487 dependent type or whose size is specified by a constant expression
9488 that is value-dependent. */
9489 /* We can only call value_dependent_expression_p on integral constant
9490 expressions; treat non-constant expressions as dependent, too. */
9491 if (processing_template_decl
9492 && (type_dependent_expression_p (size
)
9493 || !TREE_CONSTANT (size
) || value_dependent_expression_p (size
)))
9495 /* We cannot do any checking for a SIZE that isn't known to be
9496 constant. Just build the index type and mark that it requires
9497 structural equality checks. */
9498 itype
= build_index_type (build_min (MINUS_EXPR
, sizetype
,
9499 size
, size_one_node
));
9500 TYPE_DEPENDENT_P (itype
) = 1;
9501 TYPE_DEPENDENT_P_VALID (itype
) = 1;
9502 SET_TYPE_STRUCTURAL_EQUALITY (itype
);
9506 if (TREE_CODE (size
) != INTEGER_CST
)
9508 tree folded
= cp_fully_fold (size
);
9509 if (TREE_CODE (folded
) == INTEGER_CST
)
9510 pedwarn (location_of (size
), OPT_Wpedantic
,
9511 "size of array is not an integral constant-expression");
9512 /* Use the folded result for VLAs, too; it will have resolved
9517 /* Normally, the array-bound will be a constant. */
9518 if (TREE_CODE (size
) == INTEGER_CST
)
9520 /* Check to see if the array bound overflowed. Make that an
9521 error, no matter how generous we're being. */
9522 constant_expression_error (size
);
9524 /* An array must have a positive number of elements. */
9525 if (tree_int_cst_lt (size
, integer_zero_node
))
9527 if (!(complain
& tf_error
))
9528 return error_mark_node
;
9530 error ("size of array %qD is negative", name
);
9532 error ("size of array is negative");
9533 size
= integer_one_node
;
9535 /* As an extension we allow zero-sized arrays. */
9536 else if (integer_zerop (size
))
9538 if (!(complain
& tf_error
))
9539 /* We must fail if performing argument deduction (as
9540 indicated by the state of complain), so that
9541 another substitution can be found. */
9542 return error_mark_node
;
9543 else if (in_system_header_at (input_location
))
9544 /* Allow them in system headers because glibc uses them. */;
9546 pedwarn (input_location
, OPT_Wpedantic
, "ISO C++ forbids zero-size array %qD", name
);
9548 pedwarn (input_location
, OPT_Wpedantic
, "ISO C++ forbids zero-size array");
9551 else if (TREE_CONSTANT (size
)
9552 /* We don't allow VLAs at non-function scopes, or during
9553 tentative template substitution. */
9554 || !at_function_scope_p ()
9555 || !(complain
& tf_error
))
9557 if (!(complain
& tf_error
))
9558 return error_mark_node
;
9559 /* `(int) &fn' is not a valid array bound. */
9561 error ("size of array %qD is not an integral constant-expression",
9564 error ("size of array is not an integral constant-expression");
9565 size
= integer_one_node
;
9567 else if (pedantic
&& warn_vla
!= 0)
9570 pedwarn (input_location
, OPT_Wvla
, "ISO C++ forbids variable length array %qD", name
);
9572 pedwarn (input_location
, OPT_Wvla
, "ISO C++ forbids variable length array");
9574 else if (warn_vla
> 0)
9578 "variable length array %qD is used", name
);
9581 "variable length array is used");
9584 if (processing_template_decl
&& !TREE_CONSTANT (size
))
9585 /* A variable sized array. */
9586 itype
= build_min (MINUS_EXPR
, sizetype
, size
, integer_one_node
);
9589 /* Compute the index of the largest element in the array. It is
9590 one less than the number of elements in the array. We save
9591 and restore PROCESSING_TEMPLATE_DECL so that computations in
9592 cp_build_binary_op will be appropriately folded. */
9594 processing_template_decl_sentinel s
;
9595 itype
= cp_build_binary_op (input_location
,
9597 cp_convert (ssizetype
, size
, complain
),
9598 cp_convert (ssizetype
, integer_one_node
,
9601 itype
= maybe_constant_value (itype
);
9604 if (!TREE_CONSTANT (itype
))
9606 /* A variable sized array. */
9607 itype
= variable_size (itype
);
9609 stabilize_vla_size (itype
);
9611 if (sanitize_flags_p (SANITIZE_VLA
)
9612 && current_function_decl
!= NULL_TREE
)
9614 /* We have to add 1 -- in the ubsan routine we generate
9615 LE_EXPR rather than LT_EXPR. */
9616 tree t
= fold_build2 (PLUS_EXPR
, TREE_TYPE (itype
), itype
,
9617 build_one_cst (TREE_TYPE (itype
)));
9618 t
= ubsan_instrument_vla (input_location
, t
);
9619 finish_expr_stmt (t
);
9622 /* Make sure that there was no overflow when creating to a signed
9623 index type. (For example, on a 32-bit machine, an array with
9624 size 2^32 - 1 is too big.) */
9625 else if (TREE_CODE (itype
) == INTEGER_CST
9626 && TREE_OVERFLOW (itype
))
9628 if (!(complain
& tf_error
))
9629 return error_mark_node
;
9630 error ("overflow in array dimension");
9631 TREE_OVERFLOW (itype
) = 0;
9635 /* Create and return the appropriate index type. */
9636 itype
= build_index_type (itype
);
9638 /* If the index type were dependent, we would have returned early, so
9639 remember that it isn't. */
9640 TYPE_DEPENDENT_P (itype
) = 0;
9641 TYPE_DEPENDENT_P_VALID (itype
) = 1;
9645 /* Returns the scope (if any) in which the entity declared by
9646 DECLARATOR will be located. If the entity was declared with an
9647 unqualified name, NULL_TREE is returned. */
9650 get_scope_of_declarator (const cp_declarator
*declarator
)
9652 while (declarator
&& declarator
->kind
!= cdk_id
)
9653 declarator
= declarator
->declarator
;
9655 /* If the declarator-id is a SCOPE_REF, the scope in which the
9656 declaration occurs is the first operand. */
9658 && declarator
->u
.id
.qualifying_scope
)
9659 return declarator
->u
.id
.qualifying_scope
;
9661 /* Otherwise, the declarator is not a qualified name; the entity will
9662 be declared in the current scope. */
9666 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
9667 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
9671 create_array_type_for_decl (tree name
, tree type
, tree size
)
9673 tree itype
= NULL_TREE
;
9675 /* If things have already gone awry, bail now. */
9676 if (type
== error_mark_node
|| size
== error_mark_node
)
9677 return error_mark_node
;
9679 /* 8.3.4/1: If the type of the identifier of D contains the auto
9680 type-specifier, the program is ill-formed. */
9681 if (type_uses_auto (type
))
9683 error ("%qD declared as array of %qT", name
, type
);
9684 return error_mark_node
;
9687 /* If there are some types which cannot be array elements,
9688 issue an error-message and return. */
9689 switch (TREE_CODE (type
))
9693 error ("declaration of %qD as array of void", name
);
9695 error ("creating array of void");
9696 return error_mark_node
;
9700 error ("declaration of %qD as array of functions", name
);
9702 error ("creating array of functions");
9703 return error_mark_node
;
9705 case REFERENCE_TYPE
:
9707 error ("declaration of %qD as array of references", name
);
9709 error ("creating array of references");
9710 return error_mark_node
;
9714 error ("declaration of %qD as array of function members", name
);
9716 error ("creating array of function members");
9717 return error_mark_node
;
9725 The constant expressions that specify the bounds of the arrays
9726 can be omitted only for the first member of the sequence. */
9727 if (TREE_CODE (type
) == ARRAY_TYPE
&& !TYPE_DOMAIN (type
))
9730 error ("declaration of %qD as multidimensional array must "
9731 "have bounds for all dimensions except the first",
9734 error ("multidimensional array must have bounds for all "
9735 "dimensions except the first");
9737 return error_mark_node
;
9740 /* Figure out the index type for the array. */
9742 itype
= compute_array_index_type (name
, size
, tf_warning_or_error
);
9745 T is called the array element type; this type shall not be [...] an
9746 abstract class type. */
9747 abstract_virtuals_error (name
, type
);
9749 return build_cplus_array_type (type
, itype
);
9752 /* Returns the smallest location != UNKNOWN_LOCATION among the
9753 three stored in LOCATIONS[ds_const], LOCATIONS[ds_volatile],
9754 and LOCATIONS[ds_restrict]. */
9757 smallest_type_quals_location (int type_quals
, const location_t
* locations
)
9759 location_t loc
= UNKNOWN_LOCATION
;
9761 if (type_quals
& TYPE_QUAL_CONST
)
9762 loc
= locations
[ds_const
];
9764 if ((type_quals
& TYPE_QUAL_VOLATILE
)
9765 && (loc
== UNKNOWN_LOCATION
|| locations
[ds_volatile
] < loc
))
9766 loc
= locations
[ds_volatile
];
9768 if ((type_quals
& TYPE_QUAL_RESTRICT
)
9769 && (loc
== UNKNOWN_LOCATION
|| locations
[ds_restrict
] < loc
))
9770 loc
= locations
[ds_restrict
];
9775 /* Check that it's OK to declare a function with the indicated TYPE
9776 and TYPE_QUALS. SFK indicates the kind of special function (if any)
9777 that this function is. OPTYPE is the type given in a conversion
9778 operator declaration, or the class type for a constructor/destructor.
9779 Returns the actual return type of the function; that may be different
9780 than TYPE if an error occurs, or for certain special functions. */
9783 check_special_function_return_type (special_function_kind sfk
,
9787 const location_t
* locations
)
9791 case sfk_constructor
:
9793 error ("return type specification for constructor invalid");
9794 else if (type_quals
!= TYPE_UNQUALIFIED
)
9795 error_at (smallest_type_quals_location (type_quals
, locations
),
9796 "qualifiers are not allowed on constructor declaration");
9798 if (targetm
.cxx
.cdtor_returns_this ())
9799 type
= build_pointer_type (optype
);
9801 type
= void_type_node
;
9804 case sfk_destructor
:
9806 error ("return type specification for destructor invalid");
9807 else if (type_quals
!= TYPE_UNQUALIFIED
)
9808 error_at (smallest_type_quals_location (type_quals
, locations
),
9809 "qualifiers are not allowed on destructor declaration");
9811 /* We can't use the proper return type here because we run into
9812 problems with ambiguous bases and covariant returns. */
9813 if (targetm
.cxx
.cdtor_returns_this ())
9814 type
= build_pointer_type (void_type_node
);
9816 type
= void_type_node
;
9819 case sfk_conversion
:
9821 error ("return type specified for %<operator %T%>", optype
);
9822 else if (type_quals
!= TYPE_UNQUALIFIED
)
9823 error_at (smallest_type_quals_location (type_quals
, locations
),
9824 "qualifiers are not allowed on declaration of "
9825 "%<operator %T%>", optype
);
9830 case sfk_deduction_guide
:
9832 error ("return type specified for deduction guide");
9833 else if (type_quals
!= TYPE_UNQUALIFIED
)
9834 error_at (smallest_type_quals_location (type_quals
, locations
),
9835 "qualifiers are not allowed on declaration of "
9837 type
= make_template_placeholder (CLASSTYPE_TI_TEMPLATE (optype
));
9838 for (int i
= 0; i
< ds_last
; ++i
)
9839 if (i
!= ds_explicit
&& locations
[i
])
9840 error_at (locations
[i
],
9841 "decl-specifier in declaration of deduction guide");
9851 /* A variable or data member (whose unqualified name is IDENTIFIER)
9852 has been declared with the indicated TYPE. If the TYPE is not
9853 acceptable, issue an error message and return a type to use for
9854 error-recovery purposes. */
9857 check_var_type (tree identifier
, tree type
)
9859 if (VOID_TYPE_P (type
))
9862 error ("unnamed variable or field declared void");
9863 else if (identifier_p (identifier
))
9865 gcc_assert (!IDENTIFIER_ANY_OP_P (identifier
));
9866 error ("variable or field %qE declared void", identifier
);
9869 error ("variable or field declared void");
9870 type
= error_mark_node
;
9876 /* Handle declaring DECL as an inline variable. */
9879 mark_inline_variable (tree decl
)
9881 bool inlinep
= true;
9882 if (! toplevel_bindings_p ())
9884 error ("%<inline%> specifier invalid for variable "
9885 "%qD declared at block scope", decl
);
9888 else if (cxx_dialect
< cxx17
)
9889 pedwarn (DECL_SOURCE_LOCATION (decl
), 0,
9890 "inline variables are only available "
9891 "with -std=c++17 or -std=gnu++17");
9894 retrofit_lang_decl (decl
);
9895 SET_DECL_VAR_DECLARED_INLINE_P (decl
);
9900 /* Assign a typedef-given name to a class or enumeration type declared
9901 as anonymous at first. This was split out of grokdeclarator
9902 because it is also used in libcc1. */
9905 name_unnamed_type (tree type
, tree decl
)
9907 gcc_assert (TYPE_UNNAMED_P (type
));
9909 /* Replace the anonymous name with the real name everywhere. */
9910 for (tree t
= TYPE_MAIN_VARIANT (type
); t
; t
= TYPE_NEXT_VARIANT (t
))
9912 if (anon_aggrname_p (TYPE_IDENTIFIER (t
)))
9913 /* We do not rename the debug info representing the
9914 unnamed tagged type because the standard says in
9915 [dcl.typedef] that the naming applies only for
9916 linkage purposes. */
9917 /*debug_hooks->set_name (t, decl);*/
9918 TYPE_NAME (t
) = decl
;
9921 if (TYPE_LANG_SPECIFIC (type
))
9922 TYPE_WAS_UNNAMED (type
) = 1;
9924 /* If this is a typedef within a template class, the nested
9925 type is a (non-primary) template. The name for the
9926 template needs updating as well. */
9927 if (TYPE_LANG_SPECIFIC (type
) && CLASSTYPE_TEMPLATE_INFO (type
))
9928 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type
))
9929 = TYPE_IDENTIFIER (type
);
9931 /* Adjust linkage now that we aren't unnamed anymore. */
9932 reset_type_linkage (type
);
9934 /* FIXME remangle member functions; member functions of a
9935 type with external linkage have external linkage. */
9937 /* Check that our job is done, and that it would fail if we
9938 attempted to do it again. */
9939 gcc_assert (!TYPE_UNNAMED_P (type
));
9942 /* Given declspecs and a declarator (abstract or otherwise), determine
9943 the name and type of the object declared and construct a DECL node
9946 DECLSPECS points to the representation of declaration-specifier
9947 sequence that precedes declarator.
9949 DECL_CONTEXT says which syntactic context this declaration is in:
9950 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
9951 FUNCDEF for a function definition. Like NORMAL but a few different
9952 error messages in each case. Return value may be zero meaning
9953 this definition is too screwy to try to parse.
9954 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
9955 handle member functions (which have FIELD context).
9956 Return value may be zero meaning this definition is too screwy to
9958 PARM for a parameter declaration (either within a function prototype
9959 or before a function body). Make a PARM_DECL, or return void_type_node.
9960 TPARM for a template parameter declaration.
9961 CATCHPARM for a parameter declaration before a catch clause.
9962 TYPENAME if for a typename (in a cast or sizeof).
9963 Don't make a DECL node; just return the ..._TYPE node.
9964 FIELD for a struct or union field; make a FIELD_DECL.
9965 BITFIELD for a field with specified width.
9967 INITIALIZED is as for start_decl.
9969 ATTRLIST is a pointer to the list of attributes, which may be NULL
9970 if there are none; *ATTRLIST may be modified if attributes from inside
9971 the declarator should be applied to the declaration.
9973 When this function is called, scoping variables (such as
9974 CURRENT_CLASS_TYPE) should reflect the scope in which the
9975 declaration occurs, not the scope in which the new declaration will
9976 be placed. For example, on:
9980 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
9983 Returns a DECL (if a declarator is present), a TYPE (if there is no
9984 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
9988 grokdeclarator (const cp_declarator
*declarator
,
9989 cp_decl_specifier_seq
*declspecs
,
9990 enum decl_context decl_context
,
9994 tree type
= NULL_TREE
;
9996 int explicit_intN
= 0;
9997 int virtualp
, explicitp
, friendp
, inlinep
, staticp
;
9998 int explicit_int
= 0;
9999 int explicit_char
= 0;
10000 int defaulted_int
= 0;
10002 tree typedef_decl
= NULL_TREE
;
10003 const char *name
= NULL
;
10004 tree typedef_type
= NULL_TREE
;
10005 /* True if this declarator is a function definition. */
10006 bool funcdef_flag
= false;
10007 cp_declarator_kind innermost_code
= cdk_error
;
10010 /* See the code below that used this. */
10011 tree decl_attr
= NULL_TREE
;
10014 /* Keep track of what sort of function is being processed
10015 so that we can warn about default return values, or explicit
10016 return values which do not match prescribed defaults. */
10017 special_function_kind sfk
= sfk_none
;
10019 tree dname
= NULL_TREE
;
10020 tree ctor_return_type
= NULL_TREE
;
10021 enum overload_flags flags
= NO_SPECIAL
;
10022 /* cv-qualifiers that apply to the declarator, for a declaration of
10023 a member function. */
10024 cp_cv_quals memfn_quals
= TYPE_UNQUALIFIED
;
10025 /* virt-specifiers that apply to the declarator, for a declaration of
10026 a member function. */
10027 cp_virt_specifiers virt_specifiers
= VIRT_SPEC_UNSPECIFIED
;
10028 /* ref-qualifier that applies to the declarator, for a declaration of
10029 a member function. */
10030 cp_ref_qualifier rqual
= REF_QUAL_NONE
;
10031 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
10032 int type_quals
= TYPE_UNQUALIFIED
;
10033 tree raises
= NULL_TREE
;
10034 int template_count
= 0;
10035 tree returned_attrs
= NULL_TREE
;
10036 tree parms
= NULL_TREE
;
10037 const cp_declarator
*id_declarator
;
10038 /* The unqualified name of the declarator; either an
10039 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
10040 tree unqualified_id
;
10041 /* The class type, if any, in which this entity is located,
10042 or NULL_TREE if none. Note that this value may be different from
10043 the current class type; for example if an attempt is made to declare
10044 "A::f" inside "B", this value will be "A". */
10045 tree ctype
= current_class_type
;
10046 /* The NAMESPACE_DECL for the namespace in which this entity is
10047 located. If an unqualified name is used to declare the entity,
10048 this value will be NULL_TREE, even if the entity is located at
10049 namespace scope. */
10050 tree in_namespace
= NULL_TREE
;
10051 cp_storage_class storage_class
;
10052 bool unsigned_p
, signed_p
, short_p
, long_p
, thread_p
;
10053 bool type_was_error_mark_node
= false;
10054 bool parameter_pack_p
= declarator
? declarator
->parameter_pack_p
: false;
10055 bool template_type_arg
= false;
10056 bool template_parm_flag
= false;
10057 bool typedef_p
= decl_spec_seq_has_spec_p (declspecs
, ds_typedef
);
10058 bool constexpr_p
= decl_spec_seq_has_spec_p (declspecs
, ds_constexpr
);
10059 bool late_return_type_p
= false;
10060 bool array_parameter_p
= false;
10061 source_location saved_loc
= input_location
;
10062 tree reqs
= NULL_TREE
;
10064 signed_p
= decl_spec_seq_has_spec_p (declspecs
, ds_signed
);
10065 unsigned_p
= decl_spec_seq_has_spec_p (declspecs
, ds_unsigned
);
10066 short_p
= decl_spec_seq_has_spec_p (declspecs
, ds_short
);
10067 long_p
= decl_spec_seq_has_spec_p (declspecs
, ds_long
);
10068 longlong
= decl_spec_seq_has_spec_p (declspecs
, ds_long_long
);
10069 explicit_intN
= declspecs
->explicit_intN_p
;
10070 thread_p
= decl_spec_seq_has_spec_p (declspecs
, ds_thread
);
10072 // Was concept_p specified? Note that ds_concept
10073 // implies ds_constexpr!
10074 bool concept_p
= decl_spec_seq_has_spec_p (declspecs
, ds_concept
);
10076 constexpr_p
= true;
10078 if (decl_spec_seq_has_spec_p (declspecs
, ds_const
))
10079 type_quals
|= TYPE_QUAL_CONST
;
10080 if (decl_spec_seq_has_spec_p (declspecs
, ds_volatile
))
10081 type_quals
|= TYPE_QUAL_VOLATILE
;
10082 if (decl_spec_seq_has_spec_p (declspecs
, ds_restrict
))
10083 type_quals
|= TYPE_QUAL_RESTRICT
;
10085 if (decl_context
== FUNCDEF
)
10086 funcdef_flag
= true, decl_context
= NORMAL
;
10087 else if (decl_context
== MEMFUNCDEF
)
10088 funcdef_flag
= true, decl_context
= FIELD
;
10089 else if (decl_context
== BITFIELD
)
10090 bitfield
= 1, decl_context
= FIELD
;
10091 else if (decl_context
== TEMPLATE_TYPE_ARG
)
10092 template_type_arg
= true, decl_context
= TYPENAME
;
10093 else if (decl_context
== TPARM
)
10094 template_parm_flag
= true, decl_context
= PARM
;
10096 if (initialized
> 1)
10097 funcdef_flag
= true;
10099 location_t typespec_loc
= smallest_type_quals_location (type_quals
,
10100 declspecs
->locations
);
10101 if (typespec_loc
== UNKNOWN_LOCATION
)
10102 typespec_loc
= declspecs
->locations
[ds_type_spec
];
10103 if (typespec_loc
== UNKNOWN_LOCATION
)
10104 typespec_loc
= input_location
;
10106 /* Look inside a declarator for the name being declared
10107 and get it as a string, for an error message. */
10108 for (id_declarator
= declarator
;
10110 id_declarator
= id_declarator
->declarator
)
10112 if (id_declarator
->kind
!= cdk_id
)
10113 innermost_code
= id_declarator
->kind
;
10115 switch (id_declarator
->kind
)
10118 if (id_declarator
->declarator
10119 && id_declarator
->declarator
->kind
== cdk_id
)
10121 sfk
= id_declarator
->declarator
->u
.id
.sfk
;
10122 if (sfk
== sfk_destructor
)
10129 tree qualifying_scope
= id_declarator
->u
.id
.qualifying_scope
;
10130 tree decl
= id_declarator
->u
.id
.unqualified_name
;
10133 if (qualifying_scope
)
10135 if (at_function_scope_p ())
10139 A declarator-id shall not be qualified except
10142 None of the cases are permitted in block
10144 if (qualifying_scope
== global_namespace
)
10145 error ("invalid use of qualified-name %<::%D%>",
10147 else if (TYPE_P (qualifying_scope
))
10148 error ("invalid use of qualified-name %<%T::%D%>",
10149 qualifying_scope
, decl
);
10151 error ("invalid use of qualified-name %<%D::%D%>",
10152 qualifying_scope
, decl
);
10153 return error_mark_node
;
10155 else if (TYPE_P (qualifying_scope
))
10157 ctype
= qualifying_scope
;
10158 if (!MAYBE_CLASS_TYPE_P (ctype
))
10160 error ("%q#T is not a class or a namespace", ctype
);
10163 else if (innermost_code
!= cdk_function
10164 && current_class_type
10165 && !uniquely_derived_from_p (ctype
,
10166 current_class_type
))
10168 error ("invalid use of qualified-name %<%T::%D%>",
10169 qualifying_scope
, decl
);
10170 return error_mark_node
;
10173 else if (TREE_CODE (qualifying_scope
) == NAMESPACE_DECL
)
10174 in_namespace
= qualifying_scope
;
10176 switch (TREE_CODE (decl
))
10180 if (innermost_code
!= cdk_function
)
10182 error ("declaration of %qD as non-function", decl
);
10183 return error_mark_node
;
10185 else if (!qualifying_scope
10186 && !(current_class_type
&& at_class_scope_p ()))
10188 error ("declaration of %qD as non-member", decl
);
10189 return error_mark_node
;
10192 tree type
= TREE_OPERAND (decl
, 0);
10194 type
= constructor_name (type
);
10195 name
= identifier_to_locale (IDENTIFIER_POINTER (type
));
10200 case TEMPLATE_ID_EXPR
:
10202 tree fns
= TREE_OPERAND (decl
, 0);
10205 if (!identifier_p (dname
))
10206 dname
= OVL_NAME (dname
);
10208 /* Fall through. */
10210 case IDENTIFIER_NODE
:
10211 if (identifier_p (decl
))
10214 if (IDENTIFIER_KEYWORD_P (dname
))
10216 error ("declarator-id missing; using reserved word %qD",
10218 name
= identifier_to_locale (IDENTIFIER_POINTER (dname
));
10220 else if (!IDENTIFIER_CONV_OP_P (dname
))
10221 name
= identifier_to_locale (IDENTIFIER_POINTER (dname
));
10224 gcc_assert (flags
== NO_SPECIAL
);
10225 flags
= TYPENAME_FLAG
;
10226 sfk
= sfk_conversion
;
10227 tree glob
= get_global_binding (dname
);
10228 if (glob
&& TREE_CODE (glob
) == TYPE_DECL
)
10229 name
= identifier_to_locale (IDENTIFIER_POINTER (dname
));
10231 name
= "<invalid operator>";
10236 gcc_unreachable ();
10243 case cdk_reference
:
10248 name
= "structured binding";
10252 return error_mark_node
;
10255 gcc_unreachable ();
10257 if (id_declarator
->kind
== cdk_id
)
10263 The declarator in a function-definition shall have the form
10264 D1 ( parameter-declaration-clause) ... */
10265 if (funcdef_flag
&& innermost_code
!= cdk_function
)
10267 error ("function definition does not declare parameters");
10268 return error_mark_node
;
10271 if (flags
== TYPENAME_FLAG
10272 && innermost_code
!= cdk_function
10273 && ! (ctype
&& !declspecs
->any_specifiers_p
))
10275 error ("declaration of %qD as non-function", dname
);
10276 return error_mark_node
;
10279 if (dname
&& identifier_p (dname
))
10281 if (UDLIT_OPER_P (dname
)
10282 && innermost_code
!= cdk_function
)
10284 error ("declaration of %qD as non-function", dname
);
10285 return error_mark_node
;
10288 if (IDENTIFIER_ANY_OP_P (dname
))
10292 error ("declaration of %qD as %<typedef%>", dname
);
10293 return error_mark_node
;
10295 else if (decl_context
== PARM
|| decl_context
== CATCHPARM
)
10297 error ("declaration of %qD as parameter", dname
);
10298 return error_mark_node
;
10303 /* Anything declared one level down from the top level
10304 must be one of the parameters of a function
10305 (because the body is at least two levels down). */
10307 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
10308 by not allowing C++ class definitions to specify their parameters
10309 with xdecls (must be spec.d in the parmlist).
10311 Since we now wait to push a class scope until we are sure that
10312 we are in a legitimate method context, we must set oldcname
10313 explicitly (since current_class_name is not yet alive).
10315 We also want to avoid calling this a PARM if it is in a namespace. */
10317 if (decl_context
== NORMAL
&& !toplevel_bindings_p ())
10319 cp_binding_level
*b
= current_binding_level
;
10320 current_binding_level
= b
->level_chain
;
10321 if (current_binding_level
!= 0 && toplevel_bindings_p ())
10322 decl_context
= PARM
;
10323 current_binding_level
= b
;
10327 name
= decl_context
== PARM
? "parameter" : "type name";
10329 if (concept_p
&& typedef_p
)
10331 error ("%<concept%> cannot appear in a typedef declaration");
10332 return error_mark_node
;
10335 if (constexpr_p
&& typedef_p
)
10337 error ("%<constexpr%> cannot appear in a typedef declaration");
10338 return error_mark_node
;
10341 /* If there were multiple types specified in the decl-specifier-seq,
10342 issue an error message. */
10343 if (declspecs
->multiple_types_p
)
10345 error ("two or more data types in declaration of %qs", name
);
10346 return error_mark_node
;
10349 if (declspecs
->conflicting_specifiers_p
)
10351 error ("conflicting specifiers in declaration of %qs", name
);
10352 return error_mark_node
;
10355 /* Extract the basic type from the decl-specifier-seq. */
10356 type
= declspecs
->type
;
10357 if (type
== error_mark_node
)
10360 type_was_error_mark_node
= true;
10362 /* If the entire declaration is itself tagged as deprecated then
10363 suppress reports of deprecated items. */
10364 if (type
&& TREE_DEPRECATED (type
)
10365 && deprecated_state
!= DEPRECATED_SUPPRESS
)
10366 warn_deprecated_use (type
, NULL_TREE
);
10367 if (type
&& TREE_CODE (type
) == TYPE_DECL
)
10369 typedef_decl
= type
;
10370 type
= TREE_TYPE (typedef_decl
);
10371 if (TREE_DEPRECATED (type
)
10372 && DECL_ARTIFICIAL (typedef_decl
)
10373 && deprecated_state
!= DEPRECATED_SUPPRESS
)
10374 warn_deprecated_use (type
, NULL_TREE
);
10376 /* No type at all: default to `int', and set DEFAULTED_INT
10377 because it was not a user-defined typedef. */
10378 if (type
== NULL_TREE
)
10380 if (signed_p
|| unsigned_p
|| long_p
|| short_p
)
10382 /* These imply 'int'. */
10383 type
= integer_type_node
;
10386 /* If we just have "complex", it is equivalent to "complex double". */
10387 else if (!longlong
&& !explicit_intN
10388 && decl_spec_seq_has_spec_p (declspecs
, ds_complex
))
10390 type
= double_type_node
;
10391 pedwarn (declspecs
->locations
[ds_complex
], OPT_Wpedantic
,
10392 "ISO C++ does not support plain %<complex%> meaning "
10393 "%<double complex%>");
10396 /* Gather flags. */
10397 explicit_int
= declspecs
->explicit_int_p
;
10398 explicit_char
= declspecs
->explicit_char_p
;
10401 /* See the code below that used this. */
10403 decl_attr
= DECL_ATTRIBUTES (typedef_decl
);
10405 typedef_type
= type
;
10407 if (sfk
== sfk_conversion
|| sfk
== sfk_deduction_guide
)
10408 ctor_return_type
= TREE_TYPE (dname
);
10410 ctor_return_type
= ctype
;
10412 if (sfk
!= sfk_none
)
10414 type
= check_special_function_return_type (sfk
, type
,
10417 declspecs
->locations
);
10418 type_quals
= TYPE_UNQUALIFIED
;
10420 else if (type
== NULL_TREE
)
10426 /* We handle `main' specially here, because 'main () { }' is so
10427 common. With no options, it is allowed. With -Wreturn-type,
10428 it is a warning. It is only an error with -pedantic-errors. */
10429 is_main
= (funcdef_flag
10430 && dname
&& identifier_p (dname
)
10431 && MAIN_NAME_P (dname
)
10432 && ctype
== NULL_TREE
10433 && in_namespace
== NULL_TREE
10434 && current_namespace
== global_namespace
);
10436 if (type_was_error_mark_node
)
10437 /* We've already issued an error, don't complain more. */;
10438 else if (in_system_header_at (input_location
) || flag_ms_extensions
)
10439 /* Allow it, sigh. */;
10440 else if (! is_main
)
10441 permerror (input_location
, "ISO C++ forbids declaration of %qs with no type", name
);
10443 pedwarn (input_location
, OPT_Wpedantic
,
10444 "ISO C++ forbids declaration of %qs with no type", name
);
10446 warning (OPT_Wreturn_type
,
10447 "ISO C++ forbids declaration of %qs with no type", name
);
10449 if (type_was_error_mark_node
&& template_parm_flag
)
10450 /* FIXME we should be able to propagate the error_mark_node as is
10451 for other contexts too. */
10452 type
= error_mark_node
;
10454 type
= integer_type_node
;
10461 if (! int_n_enabled_p
[declspecs
->int_n_idx
])
10463 error ("%<__int%d%> is not supported by this target",
10464 int_n_data
[declspecs
->int_n_idx
].bitsize
);
10465 explicit_intN
= false;
10467 else if (pedantic
&& ! in_system_header_at (input_location
))
10468 pedwarn (input_location
, OPT_Wpedantic
,
10469 "ISO C++ does not support %<__int%d%> for %qs",
10470 int_n_data
[declspecs
->int_n_idx
].bitsize
, name
);
10473 /* Now process the modifiers that were specified
10474 and check for invalid combinations. */
10476 /* Long double is a special combination. */
10477 if (long_p
&& !longlong
&& TYPE_MAIN_VARIANT (type
) == double_type_node
)
10480 type
= cp_build_qualified_type (long_double_type_node
,
10481 cp_type_quals (type
));
10484 /* Check all other uses of type modifiers. */
10486 if (unsigned_p
|| signed_p
|| long_p
|| short_p
)
10490 if ((signed_p
|| unsigned_p
) && TREE_CODE (type
) != INTEGER_TYPE
)
10491 error ("%<signed%> or %<unsigned%> invalid for %qs", name
);
10492 else if (signed_p
&& unsigned_p
)
10493 error ("%<signed%> and %<unsigned%> specified together for %qs", name
);
10494 else if (longlong
&& TREE_CODE (type
) != INTEGER_TYPE
)
10495 error ("%<long long%> invalid for %qs", name
);
10496 else if (long_p
&& TREE_CODE (type
) == REAL_TYPE
)
10497 error ("%<long%> invalid for %qs", name
);
10498 else if (short_p
&& TREE_CODE (type
) == REAL_TYPE
)
10499 error ("%<short%> invalid for %qs", name
);
10500 else if ((long_p
|| short_p
) && TREE_CODE (type
) != INTEGER_TYPE
)
10501 error ("%<long%> or %<short%> invalid for %qs", name
);
10502 else if ((long_p
|| short_p
|| explicit_char
|| explicit_int
) && explicit_intN
)
10503 error ("%<long%>, %<int%>, %<short%>, or %<char%> invalid for %qs", name
);
10504 else if ((long_p
|| short_p
) && explicit_char
)
10505 error ("%<long%> or %<short%> specified with char for %qs", name
);
10506 else if (long_p
&& short_p
)
10507 error ("%<long%> and %<short%> specified together for %qs", name
);
10508 else if (type
== char16_type_node
|| type
== char32_type_node
)
10510 if (signed_p
|| unsigned_p
)
10511 error ("%<signed%> or %<unsigned%> invalid for %qs", name
);
10512 else if (short_p
|| long_p
)
10513 error ("%<short%> or %<long%> invalid for %qs", name
);
10518 if (!explicit_int
&& !defaulted_int
&& !explicit_char
&& !explicit_intN
&& pedantic
)
10520 pedwarn (input_location
, OPT_Wpedantic
,
10521 "long, short, signed or unsigned used invalidly for %qs",
10523 if (flag_pedantic_errors
)
10528 /* Discard the type modifiers if they are invalid. */
10531 unsigned_p
= false;
10539 /* Decide whether an integer type is signed or not.
10540 Optionally treat bitfields as signed by default. */
10544 It is implementation-defined whether a plain (neither
10545 explicitly signed or unsigned) char, short, int, or long
10546 bit-field is signed or unsigned.
10548 Naturally, we extend this to long long as well. Note that
10549 this does not include wchar_t. */
10550 || (bitfield
&& !flag_signed_bitfields
10552 /* A typedef for plain `int' without `signed' can be
10553 controlled just like plain `int', but a typedef for
10554 `signed int' cannot be so controlled. */
10556 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
))
10557 && TREE_CODE (type
) == INTEGER_TYPE
10558 && !same_type_p (TYPE_MAIN_VARIANT (type
), wchar_type_node
)))
10561 type
= int_n_trees
[declspecs
->int_n_idx
].unsigned_type
;
10563 type
= long_long_unsigned_type_node
;
10565 type
= long_unsigned_type_node
;
10567 type
= short_unsigned_type_node
;
10568 else if (type
== char_type_node
)
10569 type
= unsigned_char_type_node
;
10570 else if (typedef_decl
)
10571 type
= unsigned_type_for (type
);
10573 type
= unsigned_type_node
;
10575 else if (signed_p
&& type
== char_type_node
)
10576 type
= signed_char_type_node
;
10577 else if (explicit_intN
)
10578 type
= int_n_trees
[declspecs
->int_n_idx
].signed_type
;
10580 type
= long_long_integer_type_node
;
10582 type
= long_integer_type_node
;
10584 type
= short_integer_type_node
;
10586 if (decl_spec_seq_has_spec_p (declspecs
, ds_complex
))
10588 if (TREE_CODE (type
) != INTEGER_TYPE
&& TREE_CODE (type
) != REAL_TYPE
)
10589 error ("complex invalid for %qs", name
);
10590 /* If a modifier is specified, the resulting complex is the complex
10591 form of TYPE. E.g, "complex short" is "complex short int". */
10592 else if (type
== integer_type_node
)
10593 type
= complex_integer_type_node
;
10594 else if (type
== float_type_node
)
10595 type
= complex_float_type_node
;
10596 else if (type
== double_type_node
)
10597 type
= complex_double_type_node
;
10598 else if (type
== long_double_type_node
)
10599 type
= complex_long_double_type_node
;
10601 type
= build_complex_type (type
);
10604 /* If we're using the injected-class-name to form a compound type or a
10605 declaration, replace it with the underlying class so we don't get
10606 redundant typedefs in the debug output. But if we are returning the
10607 type unchanged, leave it alone so that it's available to
10608 maybe_get_template_decl_from_type_decl. */
10609 if (CLASS_TYPE_P (type
)
10610 && DECL_SELF_REFERENCE_P (TYPE_NAME (type
))
10611 && type
== TREE_TYPE (TYPE_NAME (type
))
10612 && (declarator
|| type_quals
))
10613 type
= DECL_ORIGINAL_TYPE (TYPE_NAME (type
));
10615 type_quals
|= cp_type_quals (type
);
10616 type
= cp_build_qualified_type_real
10617 (type
, type_quals
, ((((typedef_decl
&& !DECL_ARTIFICIAL (typedef_decl
))
10618 || declspecs
->decltype_p
)
10619 ? tf_ignore_bad_quals
: 0) | tf_warning_or_error
));
10620 /* We might have ignored or rejected some of the qualifiers. */
10621 type_quals
= cp_type_quals (type
);
10623 if (cxx_dialect
>= cxx17
&& type
&& is_auto (type
)
10624 && innermost_code
!= cdk_function
10625 && id_declarator
&& declarator
!= id_declarator
)
10626 if (tree tmpl
= CLASS_PLACEHOLDER_TEMPLATE (type
))
10628 error_at (typespec_loc
, "template placeholder type %qT must be followed "
10629 "by a simple declarator-id", type
);
10630 inform (DECL_SOURCE_LOCATION (tmpl
), "%qD declared here", tmpl
);
10634 inlinep
= decl_spec_seq_has_spec_p (declspecs
, ds_inline
);
10635 virtualp
= decl_spec_seq_has_spec_p (declspecs
, ds_virtual
);
10636 explicitp
= decl_spec_seq_has_spec_p (declspecs
, ds_explicit
);
10638 storage_class
= declspecs
->storage_class
;
10639 if (storage_class
== sc_static
)
10640 staticp
= 1 + (decl_context
== FIELD
);
10646 error ("member %qD cannot be declared both %<virtual%> "
10647 "and %<static%>", dname
);
10648 storage_class
= sc_none
;
10652 error ("member %qD cannot be declared both %<virtual%> "
10653 "and %<constexpr%>", dname
);
10655 friendp
= decl_spec_seq_has_spec_p (declspecs
, ds_friend
);
10657 /* Issue errors about use of storage classes for parameters. */
10658 if (decl_context
== PARM
)
10662 error ("typedef declaration invalid in parameter declaration");
10663 return error_mark_node
;
10665 else if (template_parm_flag
&& storage_class
!= sc_none
)
10667 error ("storage class specified for template parameter %qs", name
);
10668 return error_mark_node
;
10670 else if (storage_class
== sc_static
10671 || storage_class
== sc_extern
10673 error ("storage class specifiers invalid in parameter declarations");
10675 /* Function parameters cannot be concept. */
10677 error ("a parameter cannot be declared %<concept%>");
10678 /* Function parameters cannot be constexpr. If we saw one, moan
10679 and pretend it wasn't there. */
10680 else if (constexpr_p
)
10682 error ("a parameter cannot be declared %<constexpr%>");
10687 /* Give error if `virtual' is used outside of class declaration. */
10689 && (current_class_name
== NULL_TREE
|| decl_context
!= FIELD
))
10691 error_at (declspecs
->locations
[ds_virtual
],
10692 "%<virtual%> outside class declaration");
10696 if (innermost_code
== cdk_decomp
)
10698 location_t loc
= (declarator
->kind
== cdk_reference
10699 ? declarator
->declarator
->id_loc
: declarator
->id_loc
);
10701 error_at (declspecs
->locations
[ds_inline
],
10702 "structured binding declaration cannot be %<inline%>");
10704 error_at (declspecs
->locations
[ds_typedef
],
10705 "structured binding declaration cannot be %<typedef%>");
10707 error_at (declspecs
->locations
[ds_constexpr
], "structured "
10708 "binding declaration cannot be %<constexpr%>");
10710 error_at (declspecs
->locations
[ds_thread
],
10711 "structured binding declaration cannot be %qs",
10712 declspecs
->gnu_thread_keyword_p
10713 ? "__thread" : "thread_local");
10715 error_at (declspecs
->locations
[ds_concept
],
10716 "structured binding declaration cannot be %<concept%>");
10717 switch (storage_class
)
10722 error_at (loc
, "structured binding declaration cannot be "
10726 error_at (loc
, "structured binding declaration cannot be "
10730 error_at (loc
, "structured binding declaration cannot be "
10734 error_at (loc
, "structured binding declaration cannot be "
10738 error_at (loc
, "structured binding declaration cannot be "
10742 gcc_unreachable ();
10744 if (TREE_CODE (type
) != TEMPLATE_TYPE_PARM
10745 || TYPE_IDENTIFIER (type
) != auto_identifier
)
10747 if (type
!= error_mark_node
)
10749 error_at (loc
, "structured binding declaration cannot have "
10752 "type must be cv-qualified %<auto%> or reference to "
10753 "cv-qualified %<auto%>");
10755 type
= build_qualified_type (make_auto (), type_quals
);
10756 declspecs
->type
= type
;
10763 storage_class
= sc_none
;
10765 declspecs
->storage_class
= sc_none
;
10766 declspecs
->locations
[ds_thread
] = UNKNOWN_LOCATION
;
10769 /* Static anonymous unions are dealt with here. */
10770 if (staticp
&& decl_context
== TYPENAME
10772 && ANON_AGGR_TYPE_P (declspecs
->type
))
10773 decl_context
= FIELD
;
10775 /* Warn about storage classes that are invalid for certain
10776 kinds of declarations (parameters, typenames, etc.). */
10779 && storage_class
!= sc_extern
10780 && storage_class
!= sc_static
)
10783 error ("multiple storage classes in declaration of %qs", name
);
10786 if (decl_context
!= NORMAL
10787 && ((storage_class
!= sc_none
10788 && storage_class
!= sc_mutable
)
10791 if ((decl_context
== PARM
|| decl_context
== CATCHPARM
)
10792 && (storage_class
== sc_register
10793 || storage_class
== sc_auto
))
10795 else if (typedef_p
)
10797 else if (decl_context
== FIELD
10798 /* C++ allows static class elements. */
10799 && storage_class
== sc_static
)
10800 /* C++ also allows inlines and signed and unsigned elements,
10801 but in those cases we don't come in here. */
10805 if (decl_context
== FIELD
)
10806 error ("storage class specified for %qs", name
);
10809 if (decl_context
== PARM
|| decl_context
== CATCHPARM
)
10810 error ("storage class specified for parameter %qs", name
);
10812 error ("storage class specified for typename");
10814 if (storage_class
== sc_register
10815 || storage_class
== sc_auto
10816 || storage_class
== sc_extern
10818 storage_class
= sc_none
;
10821 else if (storage_class
== sc_extern
&& funcdef_flag
10822 && ! toplevel_bindings_p ())
10823 error ("nested function %qs declared %<extern%>", name
);
10824 else if (toplevel_bindings_p ())
10826 if (storage_class
== sc_auto
)
10827 error ("top-level declaration of %qs specifies %<auto%>", name
);
10830 && storage_class
!= sc_extern
10831 && storage_class
!= sc_static
)
10833 if (declspecs
->gnu_thread_keyword_p
)
10834 pedwarn (input_location
, 0, "function-scope %qs implicitly auto and "
10835 "declared %<__thread%>", name
);
10837 /* When thread_local is applied to a variable of block scope the
10838 storage-class-specifier static is implied if it does not appear
10840 storage_class
= declspecs
->storage_class
= sc_static
;
10844 if (storage_class
&& friendp
)
10846 error ("storage class specifiers invalid in friend function declarations");
10847 storage_class
= sc_none
;
10851 if (!id_declarator
)
10852 unqualified_id
= NULL_TREE
;
10855 unqualified_id
= id_declarator
->u
.id
.unqualified_name
;
10856 switch (TREE_CODE (unqualified_id
))
10859 unqualified_id
= TREE_OPERAND (unqualified_id
, 0);
10860 if (TYPE_P (unqualified_id
))
10861 unqualified_id
= constructor_name (unqualified_id
);
10864 case IDENTIFIER_NODE
:
10865 case TEMPLATE_ID_EXPR
:
10869 gcc_unreachable ();
10873 if (declspecs
->std_attributes
)
10875 /* Apply the c++11 attributes to the type preceding them. */
10876 input_location
= declspecs
->locations
[ds_std_attribute
];
10877 decl_attributes (&type
, declspecs
->std_attributes
, 0);
10878 input_location
= saved_loc
;
10881 /* Determine the type of the entity declared by recurring on the
10883 for (; declarator
; declarator
= declarator
->declarator
)
10885 const cp_declarator
*inner_declarator
;
10888 if (type
== error_mark_node
)
10889 return error_mark_node
;
10891 attrs
= declarator
->attributes
;
10897 if (declarator
== NULL
|| declarator
->kind
== cdk_id
)
10898 attr_flags
|= (int) ATTR_FLAG_DECL_NEXT
;
10899 if (declarator
->kind
== cdk_function
)
10900 attr_flags
|= (int) ATTR_FLAG_FUNCTION_NEXT
;
10901 if (declarator
->kind
== cdk_array
)
10902 attr_flags
|= (int) ATTR_FLAG_ARRAY_NEXT
;
10903 returned_attrs
= decl_attributes (&type
,
10904 chainon (returned_attrs
, attrs
),
10908 inner_declarator
= declarator
->declarator
;
10910 /* We don't want to warn in parameter context because we don't
10911 yet know if the parse will succeed, and this might turn out
10912 to be a constructor call. */
10913 if (decl_context
!= PARM
10914 && decl_context
!= TYPENAME
10916 && declarator
->parenthesized
!= UNKNOWN_LOCATION
10917 /* If the type is class-like and the inner name used a
10918 global namespace qualifier, we need the parens.
10919 Unfortunately all we can tell is whether a qualified name
10920 was used or not. */
10921 && !(inner_declarator
10922 && inner_declarator
->kind
== cdk_id
10923 && inner_declarator
->u
.id
.qualifying_scope
10924 && (MAYBE_CLASS_TYPE_P (type
)
10925 || TREE_CODE (type
) == ENUMERAL_TYPE
)))
10926 warning_at (declarator
->parenthesized
, OPT_Wparentheses
,
10927 "unnecessary parentheses in declaration of %qs", name
);
10928 if (declarator
->kind
== cdk_id
|| declarator
->kind
== cdk_decomp
)
10931 switch (declarator
->kind
)
10934 type
= create_array_type_for_decl (dname
, type
,
10935 declarator
->u
.array
.bounds
);
10936 if (!valid_array_size_p (input_location
, type
, dname
))
10937 type
= error_mark_node
;
10939 if (declarator
->std_attributes
)
10942 The optional attribute-specifier-seq appertains to the
10944 returned_attrs
= chainon (returned_attrs
,
10945 declarator
->std_attributes
);
10953 /* Declaring a function type. */
10955 input_location
= declspecs
->locations
[ds_type_spec
];
10956 abstract_virtuals_error (ACU_RETURN
, type
);
10957 input_location
= saved_loc
;
10959 /* Pick up type qualifiers which should be applied to `this'. */
10960 memfn_quals
= declarator
->u
.function
.qualifiers
;
10961 /* Pick up virt-specifiers. */
10962 virt_specifiers
= declarator
->u
.function
.virt_specifiers
;
10963 /* And ref-qualifier, too */
10964 rqual
= declarator
->u
.function
.ref_qualifier
;
10965 /* And tx-qualifier. */
10966 tree tx_qual
= declarator
->u
.function
.tx_qualifier
;
10967 /* Pick up the exception specifications. */
10968 raises
= declarator
->u
.function
.exception_specification
;
10969 /* If the exception-specification is ill-formed, let's pretend
10970 there wasn't one. */
10971 if (raises
== error_mark_node
)
10972 raises
= NULL_TREE
;
10975 error_at (location_of (reqs
), "requires-clause on return type");
10976 reqs
= declarator
->u
.function
.requires_clause
;
10978 /* Say it's a definition only for the CALL_EXPR
10979 closest to the identifier. */
10980 funcdecl_p
= inner_declarator
&& inner_declarator
->kind
== cdk_id
;
10982 /* Handle a late-specified return type. */
10983 tree late_return_type
= declarator
->u
.function
.late_return_type
;
10986 if (tree auto_node
= type_uses_auto (type
))
10988 if (!late_return_type
)
10990 if (current_class_type
10991 && LAMBDA_TYPE_P (current_class_type
))
10992 /* OK for C++11 lambdas. */;
10993 else if (cxx_dialect
< cxx14
)
10995 error ("%qs function uses "
10996 "%<auto%> type specifier without trailing "
10997 "return type", name
);
10998 inform (input_location
, "deduced return type "
10999 "only available with -std=c++14 or "
11004 error ("virtual function cannot "
11005 "have deduced return type");
11009 else if (!is_auto (type
) && sfk
!= sfk_conversion
)
11011 error ("%qs function with trailing return type has"
11012 " %qT as its type rather than plain %<auto%>",
11014 return error_mark_node
;
11016 if (tree tmpl
= CLASS_PLACEHOLDER_TEMPLATE (auto_node
))
11018 if (!late_return_type
)
11020 if (dguide_name_p (unqualified_id
))
11021 error_at (declarator
->id_loc
, "deduction guide "
11022 "for %qT must have trailing return "
11023 "type", TREE_TYPE (tmpl
));
11025 error_at (declarator
->id_loc
, "deduced class "
11026 "type %qT in function return type",
11028 inform (DECL_SOURCE_LOCATION (tmpl
),
11029 "%qD declared here", tmpl
);
11031 else if (CLASS_TYPE_P (late_return_type
)
11032 && CLASSTYPE_TEMPLATE_INFO (late_return_type
)
11033 && (CLASSTYPE_TI_TEMPLATE (late_return_type
)
11037 error ("trailing return type %qT of deduction guide "
11038 "is not a specialization of %qT",
11039 late_return_type
, TREE_TYPE (tmpl
));
11042 else if (late_return_type
11043 && sfk
!= sfk_conversion
)
11045 if (cxx_dialect
< cxx11
)
11046 /* Not using maybe_warn_cpp0x because this should
11047 always be an error. */
11048 error ("trailing return type only available with "
11049 "-std=c++11 or -std=gnu++11");
11051 error ("%qs function with trailing return type not "
11052 "declared with %<auto%> type specifier", name
);
11053 return error_mark_node
;
11056 type
= splice_late_return_type (type
, late_return_type
);
11057 if (type
== error_mark_node
)
11058 return error_mark_node
;
11060 if (late_return_type
)
11062 late_return_type_p
= true;
11063 type_quals
= cp_type_quals (type
);
11066 if (type_quals
!= TYPE_UNQUALIFIED
)
11068 if (SCALAR_TYPE_P (type
) || VOID_TYPE_P (type
))
11069 warning_at (typespec_loc
, OPT_Wignored_qualifiers
, "type "
11070 "qualifiers ignored on function return type");
11071 /* We now know that the TYPE_QUALS don't apply to the
11072 decl, but to its return type. */
11073 type_quals
= TYPE_UNQUALIFIED
;
11076 /* Error about some types functions can't return. */
11078 if (TREE_CODE (type
) == FUNCTION_TYPE
)
11080 error_at (typespec_loc
, "%qs declared as function returning "
11081 "a function", name
);
11082 return error_mark_node
;
11084 if (TREE_CODE (type
) == ARRAY_TYPE
)
11086 error_at (typespec_loc
, "%qs declared as function returning "
11088 return error_mark_node
;
11091 if (ctype
== NULL_TREE
11092 && decl_context
== FIELD
11095 ctype
= current_class_type
;
11097 if (ctype
&& (sfk
== sfk_constructor
11098 || sfk
== sfk_destructor
))
11100 /* We are within a class's scope. If our declarator name
11101 is the same as the class name, and we are defining
11102 a function, then it is a constructor/destructor, and
11103 therefore returns a void type. */
11105 /* ISO C++ 12.4/2. A destructor may not be declared
11106 const or volatile. A destructor may not be static.
11107 A destructor may not be declared with ref-qualifier.
11109 ISO C++ 12.1. A constructor may not be declared
11110 const or volatile. A constructor may not be
11111 virtual. A constructor may not be static.
11112 A constructor may not be declared with ref-qualifier. */
11114 error ((flags
== DTOR_FLAG
)
11115 ? G_("destructor cannot be static member function")
11116 : G_("constructor cannot be static member function"));
11119 error ((flags
== DTOR_FLAG
)
11120 ? G_("destructors may not be cv-qualified")
11121 : G_("constructors may not be cv-qualified"));
11122 memfn_quals
= TYPE_UNQUALIFIED
;
11127 maybe_warn_cpp0x (CPP0X_REF_QUALIFIER
);
11128 error ((flags
== DTOR_FLAG
)
11129 ? G_("destructors may not be ref-qualified")
11130 : G_("constructors may not be ref-qualified"));
11131 rqual
= REF_QUAL_NONE
;
11134 if (decl_context
== FIELD
11135 && !member_function_or_else (ctype
,
11136 current_class_type
,
11138 return error_mark_node
;
11140 if (flags
!= DTOR_FLAG
)
11142 /* It's a constructor. */
11143 if (explicitp
== 1)
11147 permerror (input_location
,
11148 "constructors cannot be declared %<virtual%>");
11151 if (decl_context
== FIELD
11152 && sfk
!= sfk_constructor
)
11153 return error_mark_node
;
11155 if (decl_context
== FIELD
)
11162 /* Cannot be both friend and virtual. */
11163 error ("virtual functions cannot be friends");
11166 if (decl_context
== NORMAL
)
11167 error ("friend declaration not in class definition");
11168 if (current_function_decl
&& funcdef_flag
)
11169 error ("can%'t define friend function %qs in a local "
11170 "class definition",
11173 else if (ctype
&& sfk
== sfk_conversion
)
11175 if (explicitp
== 1)
11177 maybe_warn_cpp0x (CPP0X_EXPLICIT_CONVERSION
);
11180 if (late_return_type_p
)
11181 error ("a conversion function cannot have a trailing return type");
11183 else if (sfk
== sfk_deduction_guide
)
11185 if (explicitp
== 1)
11189 arg_types
= grokparms (declarator
->u
.function
.parameters
,
11192 if (inner_declarator
11193 && inner_declarator
->kind
== cdk_id
11194 && inner_declarator
->u
.id
.sfk
== sfk_destructor
11195 && arg_types
!= void_list_node
)
11197 error ("destructors may not have parameters");
11198 arg_types
= void_list_node
;
11202 type
= build_function_type (type
, arg_types
);
11204 tree attrs
= declarator
->std_attributes
;
11207 tree att
= build_tree_list (tx_qual
, NULL_TREE
);
11208 /* transaction_safe applies to the type, but
11209 transaction_safe_dynamic applies to the function. */
11210 if (is_attribute_p ("transaction_safe", tx_qual
))
11211 attrs
= chainon (attrs
, att
);
11213 returned_attrs
= chainon (returned_attrs
, att
);
11218 The optional attribute-specifier-seq appertains to
11219 the function type. */
11220 decl_attributes (&type
, attrs
, 0);
11223 type
= build_exception_variant (type
, raises
);
11228 case cdk_reference
:
11230 /* Filter out pointers-to-references and references-to-references.
11231 We can get these if a TYPE_DECL is used. */
11233 if (TREE_CODE (type
) == REFERENCE_TYPE
)
11235 if (declarator
->kind
!= cdk_reference
)
11237 error ("cannot declare pointer to %q#T", type
);
11238 type
= TREE_TYPE (type
);
11241 /* In C++0x, we allow reference to reference declarations
11242 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
11243 and template type arguments [14.3.1/4 temp.arg.type]. The
11244 check for direct reference to reference declarations, which
11245 are still forbidden, occurs below. Reasoning behind the change
11246 can be found in DR106, DR540, and the rvalue reference
11248 else if (cxx_dialect
== cxx98
)
11250 error ("cannot declare reference to %q#T", type
);
11251 type
= TREE_TYPE (type
);
11254 else if (VOID_TYPE_P (type
))
11256 if (declarator
->kind
== cdk_reference
)
11257 error ("cannot declare reference to %q#T", type
);
11258 else if (declarator
->kind
== cdk_ptrmem
)
11259 error ("cannot declare pointer to %q#T member", type
);
11262 /* We now know that the TYPE_QUALS don't apply to the decl,
11263 but to the target of the pointer. */
11264 type_quals
= TYPE_UNQUALIFIED
;
11266 /* This code used to handle METHOD_TYPE, but I don't think it's
11267 possible to get it here anymore. */
11268 gcc_assert (TREE_CODE (type
) != METHOD_TYPE
);
11269 if (declarator
->kind
== cdk_ptrmem
11270 && TREE_CODE (type
) == FUNCTION_TYPE
)
11272 memfn_quals
|= type_memfn_quals (type
);
11273 type
= build_memfn_type (type
,
11274 declarator
->u
.pointer
.class_type
,
11277 if (type
== error_mark_node
)
11278 return error_mark_node
;
11280 rqual
= REF_QUAL_NONE
;
11281 memfn_quals
= TYPE_UNQUALIFIED
;
11284 if (TREE_CODE (type
) == FUNCTION_TYPE
11285 && (type_memfn_quals (type
) != TYPE_UNQUALIFIED
11286 || type_memfn_rqual (type
) != REF_QUAL_NONE
))
11287 error (declarator
->kind
== cdk_reference
11288 ? G_("cannot declare reference to qualified function type %qT")
11289 : G_("cannot declare pointer to qualified function type %qT"),
11292 /* When the pointed-to type involves components of variable size,
11293 care must be taken to ensure that the size evaluation code is
11294 emitted early enough to dominate all the possible later uses
11295 and late enough for the variables on which it depends to have
11298 This is expected to happen automatically when the pointed-to
11299 type has a name/declaration of it's own, but special attention
11300 is required if the type is anonymous.
11302 We handle the NORMAL and FIELD contexts here by inserting a
11303 dummy statement that just evaluates the size at a safe point
11304 and ensures it is not deferred until e.g. within a deeper
11305 conditional context (c++/43555).
11307 We expect nothing to be needed here for PARM or TYPENAME.
11308 Evaluating the size at this point for TYPENAME would
11309 actually be incorrect, as we might be in the middle of an
11310 expression with side effects on the pointed-to type size
11311 "arguments" prior to the pointer declaration point and the
11312 size evaluation could end up prior to the side effects. */
11314 if (!TYPE_NAME (type
)
11315 && (decl_context
== NORMAL
|| decl_context
== FIELD
)
11316 && at_function_scope_p ()
11317 && variably_modified_type_p (type
, NULL_TREE
))
11319 TYPE_NAME (type
) = build_decl (UNKNOWN_LOCATION
, TYPE_DECL
,
11321 add_decl_expr (TYPE_NAME (type
));
11324 if (declarator
->kind
== cdk_reference
)
11326 /* In C++0x, the type we are creating a reference to might be
11327 a typedef which is itself a reference type. In that case,
11328 we follow the reference collapsing rules in
11329 [7.1.3/8 dcl.typedef] to create the final reference type:
11331 "If a typedef TD names a type that is a reference to a type
11332 T, an attempt to create the type 'lvalue reference to cv TD'
11333 creates the type 'lvalue reference to T,' while an attempt
11334 to create the type "rvalue reference to cv TD' creates the
11337 if (VOID_TYPE_P (type
))
11338 /* We already gave an error. */;
11339 else if (TREE_CODE (type
) == REFERENCE_TYPE
)
11341 if (declarator
->u
.reference
.rvalue_ref
)
11342 /* Leave type alone. */;
11344 type
= cp_build_reference_type (TREE_TYPE (type
), false);
11347 type
= cp_build_reference_type
11348 (type
, declarator
->u
.reference
.rvalue_ref
);
11350 /* In C++0x, we need this check for direct reference to
11351 reference declarations, which are forbidden by
11352 [8.3.2/5 dcl.ref]. Reference to reference declarations
11353 are only allowed indirectly through typedefs and template
11354 type arguments. Example:
11356 void foo(int & &); // invalid ref-to-ref decl
11358 typedef int & int_ref;
11359 void foo(int_ref &); // valid ref-to-ref decl
11361 if (inner_declarator
&& inner_declarator
->kind
== cdk_reference
)
11362 error ("cannot declare reference to %q#T, which is not "
11363 "a typedef or a template type argument", type
);
11365 else if (TREE_CODE (type
) == METHOD_TYPE
)
11366 type
= build_ptrmemfunc_type (build_pointer_type (type
));
11367 else if (declarator
->kind
== cdk_ptrmem
)
11369 gcc_assert (TREE_CODE (declarator
->u
.pointer
.class_type
)
11370 != NAMESPACE_DECL
);
11371 if (declarator
->u
.pointer
.class_type
== error_mark_node
)
11372 /* We will already have complained. */
11373 type
= error_mark_node
;
11375 type
= build_ptrmem_type (declarator
->u
.pointer
.class_type
,
11379 type
= build_pointer_type (type
);
11381 /* Process a list of type modifier keywords (such as
11382 const or volatile) that were given inside the `*' or `&'. */
11384 if (declarator
->u
.pointer
.qualifiers
)
11387 = cp_build_qualified_type (type
,
11388 declarator
->u
.pointer
.qualifiers
);
11389 type_quals
= cp_type_quals (type
);
11392 /* Apply C++11 attributes to the pointer, and not to the
11393 type pointed to. This is unlike what is done for GNU
11394 attributes above. It is to comply with [dcl.ptr]/1:
11396 [the optional attribute-specifier-seq (7.6.1) appertains
11397 to the pointer and not to the object pointed to]. */
11398 if (declarator
->std_attributes
)
11399 decl_attributes (&type
, declarator
->std_attributes
,
11409 gcc_unreachable ();
11413 /* A `constexpr' specifier used in an object declaration declares
11414 the object as `const'. */
11415 if (constexpr_p
&& innermost_code
!= cdk_function
)
11417 /* DR1688 says that a `constexpr' specifier in combination with
11418 `volatile' is valid. */
11420 if (TREE_CODE (type
) != REFERENCE_TYPE
)
11422 type_quals
|= TYPE_QUAL_CONST
;
11423 type
= cp_build_qualified_type (type
, type_quals
);
11427 if (unqualified_id
&& TREE_CODE (unqualified_id
) == TEMPLATE_ID_EXPR
11428 && TREE_CODE (type
) != FUNCTION_TYPE
11429 && TREE_CODE (type
) != METHOD_TYPE
11430 && !variable_template_p (TREE_OPERAND (unqualified_id
, 0)))
11432 error ("template-id %qD used as a declarator",
11434 unqualified_id
= dname
;
11437 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
11438 qualified with a class-name, turn it into a METHOD_TYPE, unless
11439 we know that the function is static. We take advantage of this
11440 opportunity to do other processing that pertains to entities
11441 explicitly declared to be class members. Note that if DECLARATOR
11442 is non-NULL, we know it is a cdk_id declarator; otherwise, we
11443 would not have exited the loop above. */
11445 && declarator
->kind
== cdk_id
11446 && declarator
->u
.id
.qualifying_scope
11447 && MAYBE_CLASS_TYPE_P (declarator
->u
.id
.qualifying_scope
))
11449 ctype
= declarator
->u
.id
.qualifying_scope
;
11450 ctype
= TYPE_MAIN_VARIANT (ctype
);
11451 template_count
= num_template_headers_for_class (ctype
);
11453 if (ctype
== current_class_type
)
11457 permerror (input_location
, "member functions are implicitly "
11458 "friends of their class");
11462 permerror (declarator
->id_loc
,
11463 "extra qualification %<%T::%> on member %qs",
11466 else if (/* If the qualifying type is already complete, then we
11467 can skip the following checks. */
11468 !COMPLETE_TYPE_P (ctype
)
11469 && (/* If the function is being defined, then
11470 qualifying type must certainly be complete. */
11472 /* A friend declaration of "T::f" is OK, even if
11473 "T" is a template parameter. But, if this
11474 function is not a friend, the qualifying type
11475 must be a class. */
11476 || (!friendp
&& !CLASS_TYPE_P (ctype
))
11477 /* For a declaration, the type need not be
11478 complete, if either it is dependent (since there
11479 is no meaningful definition of complete in that
11480 case) or the qualifying class is currently being
11482 || !(dependent_type_p (ctype
)
11483 || currently_open_class (ctype
)))
11484 /* Check that the qualifying type is complete. */
11485 && !complete_type_or_else (ctype
, NULL_TREE
))
11486 return error_mark_node
;
11487 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
11489 if (current_class_type
11490 && (!friendp
|| funcdef_flag
|| initialized
))
11492 error (funcdef_flag
|| initialized
11493 ? G_("cannot define member function %<%T::%s%> "
11495 : G_("cannot declare member function %<%T::%s%> "
11497 ctype
, name
, current_class_type
);
11498 return error_mark_node
;
11501 else if (typedef_p
&& current_class_type
)
11503 error ("cannot declare member %<%T::%s%> within %qT",
11504 ctype
, name
, current_class_type
);
11505 return error_mark_node
;
11509 if (ctype
== NULL_TREE
&& decl_context
== FIELD
&& friendp
== 0)
11510 ctype
= current_class_type
;
11512 /* Now TYPE has the actual type. */
11514 if (returned_attrs
)
11517 *attrlist
= chainon (returned_attrs
, *attrlist
);
11519 attrlist
= &returned_attrs
;
11523 && declarator
->kind
== cdk_id
11524 && declarator
->std_attributes
11525 && attrlist
!= NULL
)
11527 /* [dcl.meaning]/1: The optional attribute-specifier-seq following
11528 a declarator-id appertains to the entity that is declared. */
11529 if (declarator
->std_attributes
!= error_mark_node
)
11530 *attrlist
= chainon (*attrlist
, declarator
->std_attributes
);
11532 /* We should have already diagnosed the issue (c++/78344). */
11533 gcc_assert (seen_error ());
11536 /* Handle parameter packs. */
11537 if (parameter_pack_p
)
11539 if (decl_context
== PARM
)
11540 /* Turn the type into a pack expansion.*/
11541 type
= make_pack_expansion (type
);
11543 error ("non-parameter %qs cannot be a parameter pack", name
);
11546 if ((decl_context
== FIELD
|| decl_context
== PARM
)
11547 && !processing_template_decl
11548 && variably_modified_type_p (type
, NULL_TREE
))
11550 if (decl_context
== FIELD
)
11551 error ("data member may not have variably modified type %qT", type
);
11553 error ("parameter may not have variably modified type %qT", type
);
11554 type
= error_mark_node
;
11557 if (explicitp
== 1 || (explicitp
&& friendp
))
11559 /* [dcl.fct.spec] (C++11) The explicit specifier shall be used only
11560 in the declaration of a constructor or conversion function within
11561 a class definition. */
11562 if (!current_class_type
)
11563 error_at (declspecs
->locations
[ds_explicit
],
11564 "%<explicit%> outside class declaration");
11566 error_at (declspecs
->locations
[ds_explicit
],
11567 "%<explicit%> in friend declaration");
11569 error_at (declspecs
->locations
[ds_explicit
],
11570 "only declarations of constructors and conversion operators "
11571 "can be %<explicit%>");
11575 if (storage_class
== sc_mutable
)
11577 if (decl_context
!= FIELD
|| friendp
)
11579 error ("non-member %qs cannot be declared %<mutable%>", name
);
11580 storage_class
= sc_none
;
11582 else if (decl_context
== TYPENAME
|| typedef_p
)
11584 error ("non-object member %qs cannot be declared %<mutable%>", name
);
11585 storage_class
= sc_none
;
11587 else if (TREE_CODE (type
) == FUNCTION_TYPE
11588 || TREE_CODE (type
) == METHOD_TYPE
)
11590 error ("function %qs cannot be declared %<mutable%>", name
);
11591 storage_class
= sc_none
;
11595 error ("static %qs cannot be declared %<mutable%>", name
);
11596 storage_class
= sc_none
;
11598 else if (type_quals
& TYPE_QUAL_CONST
)
11600 error ("const %qs cannot be declared %<mutable%>", name
);
11601 storage_class
= sc_none
;
11603 else if (TREE_CODE (type
) == REFERENCE_TYPE
)
11605 permerror (input_location
, "reference %qs cannot be declared "
11606 "%<mutable%>", name
);
11607 storage_class
= sc_none
;
11611 /* If this is declaring a typedef name, return a TYPE_DECL. */
11612 if (typedef_p
&& decl_context
!= TYPENAME
)
11616 /* This declaration:
11618 typedef void f(int) const;
11620 declares a function type which is not a member of any
11621 particular class, but which is cv-qualified; for
11622 example "f S::*" declares a pointer to a const-qualified
11623 member function of S. We record the cv-qualification in the
11625 if ((rqual
|| memfn_quals
) && TREE_CODE (type
) == FUNCTION_TYPE
)
11627 type
= apply_memfn_quals (type
, memfn_quals
, rqual
);
11629 /* We have now dealt with these qualifiers. */
11630 memfn_quals
= TYPE_UNQUALIFIED
;
11631 rqual
= REF_QUAL_NONE
;
11634 if (type_uses_auto (type
))
11636 error ("typedef declared %<auto%>");
11637 type
= error_mark_node
;
11641 error_at (location_of (reqs
), "requires-clause on typedef");
11643 if (decl_context
== FIELD
)
11644 decl
= build_lang_decl (TYPE_DECL
, unqualified_id
, type
);
11646 decl
= build_decl (input_location
, TYPE_DECL
, unqualified_id
, type
);
11647 if (id_declarator
&& declarator
->u
.id
.qualifying_scope
) {
11648 error_at (DECL_SOURCE_LOCATION (decl
),
11649 "typedef name may not be a nested-name-specifier");
11650 TREE_TYPE (decl
) = error_mark_node
;
11653 if (decl_context
!= FIELD
)
11655 if (!current_function_decl
)
11656 DECL_CONTEXT (decl
) = FROB_CONTEXT (current_namespace
);
11657 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl
)
11658 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
11659 (current_function_decl
)))
11660 /* The TYPE_DECL is "abstract" because there will be
11661 clones of this constructor/destructor, and there will
11662 be copies of this TYPE_DECL generated in those
11663 clones. The decloning optimization (for space) may
11664 revert this subsequently if it determines that
11665 the clones should share a common implementation. */
11666 DECL_ABSTRACT_P (decl
) = true;
11668 else if (current_class_type
11669 && constructor_name_p (unqualified_id
, current_class_type
))
11670 permerror (input_location
, "ISO C++ forbids nested type %qD with same name "
11671 "as enclosing class",
11674 /* If the user declares "typedef struct {...} foo" then the
11675 struct will have an anonymous name. Fill that name in now.
11676 Nothing can refer to it, so nothing needs know about the name
11678 if (type
!= error_mark_node
11680 && TYPE_NAME (type
)
11681 && TREE_CODE (TYPE_NAME (type
)) == TYPE_DECL
11682 && TYPE_UNNAMED_P (type
)
11683 && declspecs
->type_definition_p
11684 && attributes_naming_typedef_ok (*attrlist
)
11685 && cp_type_quals (type
) == TYPE_UNQUALIFIED
)
11686 name_unnamed_type (type
, decl
);
11689 || (typedef_decl
&& C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
)))
11690 C_TYPEDEF_EXPLICITLY_SIGNED (decl
) = 1;
11692 bad_specifiers (decl
, BSP_TYPE
, virtualp
,
11693 memfn_quals
!= TYPE_UNQUALIFIED
,
11694 inlinep
, friendp
, raises
!= NULL_TREE
);
11696 if (decl_spec_seq_has_spec_p (declspecs
, ds_alias
))
11697 /* Acknowledge that this was written:
11698 `using analias = atype;'. */
11699 TYPE_DECL_ALIAS_P (decl
) = 1;
11704 /* Detect the case of an array type of unspecified size
11705 which came, as such, direct from a typedef name.
11706 We must copy the type, so that the array's domain can be
11707 individually set by the object's initializer. */
11709 if (type
&& typedef_type
11710 && TREE_CODE (type
) == ARRAY_TYPE
&& !TYPE_DOMAIN (type
)
11711 && TYPE_MAIN_VARIANT (type
) == TYPE_MAIN_VARIANT (typedef_type
))
11712 type
= build_cplus_array_type (TREE_TYPE (type
), NULL_TREE
);
11714 /* Detect where we're using a typedef of function type to declare a
11715 function. PARMS will not be set, so we must create it now. */
11717 if (type
== typedef_type
&& TREE_CODE (type
) == FUNCTION_TYPE
)
11719 tree decls
= NULL_TREE
;
11722 for (args
= TYPE_ARG_TYPES (type
);
11723 args
&& args
!= void_list_node
;
11724 args
= TREE_CHAIN (args
))
11726 tree decl
= cp_build_parm_decl (NULL_TREE
, NULL_TREE
,
11727 TREE_VALUE (args
));
11729 DECL_CHAIN (decl
) = decls
;
11733 parms
= nreverse (decls
);
11735 if (decl_context
!= TYPENAME
)
11737 /* The qualifiers on the function type become the qualifiers on
11738 the non-static member function. */
11739 memfn_quals
|= type_memfn_quals (type
);
11740 rqual
= type_memfn_rqual (type
);
11741 type_quals
= TYPE_UNQUALIFIED
;
11745 /* If this is a type name (such as, in a cast or sizeof),
11746 compute the type and return it now. */
11748 if (decl_context
== TYPENAME
)
11750 /* Note that here we don't care about type_quals. */
11752 /* Special case: "friend class foo" looks like a TYPENAME context. */
11757 error ("%<inline%> specified for friend class declaration");
11763 /* Don't allow friend declaration without a class-key. */
11764 if (TREE_CODE (type
) == TEMPLATE_TYPE_PARM
)
11765 permerror (input_location
, "template parameters cannot be friends");
11766 else if (TREE_CODE (type
) == TYPENAME_TYPE
)
11767 permerror (input_location
, "friend declaration requires class-key, "
11768 "i.e. %<friend class %T::%D%>",
11769 TYPE_CONTEXT (type
), TYPENAME_TYPE_FULLNAME (type
));
11771 permerror (input_location
, "friend declaration requires class-key, "
11772 "i.e. %<friend %#T%>",
11776 /* Only try to do this stuff if we didn't already give up. */
11777 if (type
!= integer_type_node
)
11779 /* A friendly class? */
11780 if (current_class_type
)
11781 make_friend_class (current_class_type
, TYPE_MAIN_VARIANT (type
),
11782 /*complain=*/true);
11784 error ("trying to make class %qT a friend of global scope",
11787 type
= void_type_node
;
11790 else if (memfn_quals
|| rqual
)
11792 if (ctype
== NULL_TREE
11793 && TREE_CODE (type
) == METHOD_TYPE
)
11794 ctype
= TYPE_METHOD_BASETYPE (type
);
11797 type
= build_memfn_type (type
, ctype
, memfn_quals
, rqual
);
11798 /* Core issue #547: need to allow this in template type args.
11799 Allow it in general in C++11 for alias-declarations. */
11800 else if ((template_type_arg
|| cxx_dialect
>= cxx11
)
11801 && TREE_CODE (type
) == FUNCTION_TYPE
)
11802 type
= apply_memfn_quals (type
, memfn_quals
, rqual
);
11804 error ("invalid qualifiers on non-member function type");
11808 error_at (location_of (reqs
), "requires-clause on type-id");
11812 else if (unqualified_id
== NULL_TREE
&& decl_context
!= PARM
11813 && decl_context
!= CATCHPARM
11814 && TREE_CODE (type
) != UNION_TYPE
11816 && innermost_code
!= cdk_decomp
)
11818 error ("abstract declarator %qT used as declaration", type
);
11819 return error_mark_node
;
11822 if (!FUNC_OR_METHOD_TYPE_P (type
))
11824 /* Only functions may be declared using an operator-function-id. */
11825 if (dname
&& IDENTIFIER_ANY_OP_P (dname
))
11827 error ("declaration of %qD as non-function", dname
);
11828 return error_mark_node
;
11832 error_at (location_of (reqs
),
11833 "requires-clause on declaration of non-function type %qT",
11837 /* We don't check parameter types here because we can emit a better
11838 error message later. */
11839 if (decl_context
!= PARM
)
11841 type
= check_var_type (unqualified_id
, type
);
11842 if (type
== error_mark_node
)
11843 return error_mark_node
;
11846 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
11847 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
11849 if (decl_context
== PARM
|| decl_context
== CATCHPARM
)
11851 if (ctype
|| in_namespace
)
11852 error ("cannot use %<::%> in parameter declaration");
11854 if (type_uses_auto (type
)
11855 && !(cxx_dialect
>= cxx17
&& template_parm_flag
))
11857 if (cxx_dialect
>= cxx14
)
11858 error ("%<auto%> parameter not permitted in this context");
11860 error ("parameter declared %<auto%>");
11861 type
= error_mark_node
;
11864 /* A parameter declared as an array of T is really a pointer to T.
11865 One declared as a function is really a pointer to a function.
11866 One declared as a member is really a pointer to member. */
11868 if (TREE_CODE (type
) == ARRAY_TYPE
)
11870 /* Transfer const-ness of array into that of type pointed to. */
11871 type
= build_pointer_type (TREE_TYPE (type
));
11872 type_quals
= TYPE_UNQUALIFIED
;
11873 array_parameter_p
= true;
11875 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
11876 type
= build_pointer_type (type
);
11879 if (ctype
&& TREE_CODE (type
) == FUNCTION_TYPE
&& staticp
< 2
11880 && !(identifier_p (unqualified_id
)
11881 && IDENTIFIER_NEWDEL_OP_P (unqualified_id
)))
11883 cp_cv_quals real_quals
= memfn_quals
;
11884 if (cxx_dialect
< cxx14
&& constexpr_p
11885 && sfk
!= sfk_constructor
&& sfk
!= sfk_destructor
)
11886 real_quals
|= TYPE_QUAL_CONST
;
11887 type
= build_memfn_type (type
, ctype
, real_quals
, rqual
);
11891 tree decl
= NULL_TREE
;
11893 if (decl_context
== PARM
)
11895 decl
= cp_build_parm_decl (NULL_TREE
, unqualified_id
, type
);
11896 DECL_ARRAY_PARAMETER_P (decl
) = array_parameter_p
;
11898 bad_specifiers (decl
, BSP_PARM
, virtualp
,
11899 memfn_quals
!= TYPE_UNQUALIFIED
,
11900 inlinep
, friendp
, raises
!= NULL_TREE
);
11902 else if (decl_context
== FIELD
)
11904 if (!staticp
&& !friendp
&& TREE_CODE (type
) != METHOD_TYPE
)
11905 if (tree auto_node
= type_uses_auto (type
))
11907 location_t loc
= declspecs
->locations
[ds_type_spec
];
11908 if (CLASS_PLACEHOLDER_TEMPLATE (auto_node
))
11909 error_at (loc
, "invalid use of template-name %qE without an "
11911 CLASS_PLACEHOLDER_TEMPLATE (auto_node
));
11913 error_at (loc
, "non-static data member declared with "
11914 "placeholder %qT", auto_node
);
11915 type
= error_mark_node
;
11918 /* The C99 flexible array extension. */
11919 if (!staticp
&& TREE_CODE (type
) == ARRAY_TYPE
11920 && TYPE_DOMAIN (type
) == NULL_TREE
)
11923 && (TREE_CODE (ctype
) == UNION_TYPE
11924 || TREE_CODE (ctype
) == QUAL_UNION_TYPE
))
11926 error ("flexible array member in union");
11927 type
= error_mark_node
;
11931 /* Array is a flexible member. */
11932 if (in_system_header_at (input_location
))
11933 /* Do not warn on flexible array members in system
11934 headers because glibc uses them. */;
11936 pedwarn (input_location
, OPT_Wpedantic
,
11937 "ISO C++ forbids flexible array member %qs", name
);
11939 pedwarn (input_location
, OPT_Wpedantic
,
11940 "ISO C++ forbids flexible array members");
11942 /* Flexible array member has a null domain. */
11943 type
= build_cplus_array_type (TREE_TYPE (type
), NULL_TREE
);
11947 if (type
== error_mark_node
)
11949 /* Happens when declaring arrays of sizes which
11950 are error_mark_node, for example. */
11953 else if (in_namespace
&& !friendp
)
11955 /* Something like struct S { int N::j; }; */
11956 error ("invalid use of %<::%>");
11957 return error_mark_node
;
11959 else if (TREE_CODE (type
) == FUNCTION_TYPE
11960 || TREE_CODE (type
) == METHOD_TYPE
)
11963 tree function_context
;
11967 /* This should never happen in pure C++ (the check
11968 could be an assert). It could happen in
11969 Objective-C++ if someone writes invalid code that
11970 uses a function declaration for an instance
11971 variable or property (instance variables and
11972 properties are parsed as FIELD_DECLs, but they are
11973 part of an Objective-C class, not a C++ class).
11974 That code is invalid and is caught by this
11978 error ("declaration of function %qD in invalid context",
11980 return error_mark_node
;
11983 /* ``A union may [ ... ] not [ have ] virtual functions.''
11985 if (virtualp
&& TREE_CODE (ctype
) == UNION_TYPE
)
11987 error ("function %qD declared %<virtual%> inside a union",
11989 return error_mark_node
;
11993 && identifier_p (unqualified_id
)
11994 && IDENTIFIER_NEWDEL_OP_P (unqualified_id
))
11996 error ("%qD cannot be declared %<virtual%>, since it "
11997 "is always static", unqualified_id
);
12002 /* Check that the name used for a destructor makes sense. */
12003 if (sfk
== sfk_destructor
)
12005 tree uqname
= id_declarator
->u
.id
.unqualified_name
;
12009 gcc_assert (friendp
);
12010 error ("expected qualified name in friend declaration "
12011 "for destructor %qD", uqname
);
12012 return error_mark_node
;
12015 if (!check_dtor_name (ctype
, TREE_OPERAND (uqname
, 0)))
12017 error ("declaration of %qD as member of %qT",
12019 return error_mark_node
;
12023 error ("a destructor cannot be %<concept%>");
12024 return error_mark_node
;
12028 error ("a destructor cannot be %<constexpr%>");
12029 return error_mark_node
;
12032 else if (sfk
== sfk_constructor
&& friendp
&& !ctype
)
12034 error ("expected qualified name in friend declaration "
12035 "for constructor %qD",
12036 id_declarator
->u
.id
.unqualified_name
);
12037 return error_mark_node
;
12039 if (sfk
== sfk_constructor
)
12042 error ("a constructor cannot be %<concept%>");
12043 return error_mark_node
;
12047 error ("a concept cannot be a member function");
12051 if (TREE_CODE (unqualified_id
) == TEMPLATE_ID_EXPR
)
12053 tree tmpl
= TREE_OPERAND (unqualified_id
, 0);
12054 if (variable_template_p (tmpl
))
12056 error ("specialization of variable template %qD "
12057 "declared as function", tmpl
);
12058 inform (DECL_SOURCE_LOCATION (tmpl
),
12059 "variable template declared here");
12060 return error_mark_node
;
12064 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
12065 function_context
= (ctype
!= NULL_TREE
) ?
12066 decl_function_context (TYPE_MAIN_DECL (ctype
)) : NULL_TREE
;
12067 publicp
= (! friendp
|| ! staticp
)
12068 && function_context
== NULL_TREE
;
12070 if (late_return_type_p
)
12071 TYPE_HAS_LATE_RETURN_TYPE (type
) = 1;
12073 decl
= grokfndecl (ctype
, type
,
12074 TREE_CODE (unqualified_id
) != TEMPLATE_ID_EXPR
12075 ? unqualified_id
: dname
,
12079 virtualp
, flags
, memfn_quals
, rqual
, raises
,
12080 friendp
? -1 : 0, friendp
, publicp
,
12081 inlinep
| (2 * constexpr_p
) | (4 * concept_p
),
12082 initialized
== SD_DELETED
, sfk
,
12083 funcdef_flag
, template_count
, in_namespace
,
12084 attrlist
, declarator
->id_loc
);
12085 decl
= set_virt_specifiers (decl
, virt_specifiers
);
12086 if (decl
== NULL_TREE
)
12087 return error_mark_node
;
12089 /* This clobbers the attrs stored in `decl' from `attrlist'. */
12090 /* The decl and setting of decl_attr is also turned off. */
12091 decl
= build_decl_attribute_variant (decl
, decl_attr
);
12094 /* [class.conv.ctor]
12096 A constructor declared without the function-specifier
12097 explicit that can be called with a single parameter
12098 specifies a conversion from the type of its first
12099 parameter to the type of its class. Such a constructor
12100 is called a converting constructor. */
12101 if (explicitp
== 2)
12102 DECL_NONCONVERTING_P (decl
) = 1;
12104 else if (!staticp
&& !dependent_type_p (type
)
12105 && !COMPLETE_TYPE_P (complete_type (type
))
12106 && (!complete_or_array_type_p (type
)
12107 || initialized
== 0))
12109 if (TREE_CODE (type
) != ARRAY_TYPE
12110 || !COMPLETE_TYPE_P (TREE_TYPE (type
)))
12112 if (unqualified_id
)
12114 error ("field %qD has incomplete type %qT",
12115 unqualified_id
, type
);
12116 cxx_incomplete_type_inform (strip_array_types (type
));
12119 error ("name %qT has incomplete type", type
);
12121 type
= error_mark_node
;
12129 error ("%qE is neither function nor member function; "
12130 "cannot be declared friend", unqualified_id
);
12138 /* Friends are treated specially. */
12139 if (ctype
== current_class_type
)
12140 ; /* We already issued a permerror. */
12141 else if (decl
&& DECL_NAME (decl
))
12143 if (template_class_depth (current_class_type
) == 0)
12145 decl
= check_explicit_specialization
12146 (unqualified_id
, decl
, template_count
,
12147 2 * funcdef_flag
+ 4);
12148 if (decl
== error_mark_node
)
12149 return error_mark_node
;
12152 decl
= do_friend (ctype
, unqualified_id
, decl
,
12158 return error_mark_node
;
12161 /* Structure field. It may not be a function, except for C++. */
12163 if (decl
== NULL_TREE
)
12167 /* C++ allows static class members. All other work
12168 for this is done by grokfield. */
12169 decl
= build_lang_decl_loc (declarator
12170 ? declarator
->id_loc
12172 VAR_DECL
, unqualified_id
, type
);
12173 set_linkage_for_static_data_member (decl
);
12175 error ("static data member %qE declared %<concept%>",
12177 else if (constexpr_p
&& !initialized
)
12179 error ("%<constexpr%> static data member %qD must have an "
12180 "initializer", decl
);
12181 constexpr_p
= false;
12185 mark_inline_variable (decl
);
12187 if (!DECL_VAR_DECLARED_INLINE_P (decl
)
12188 && !(cxx_dialect
>= cxx17
&& constexpr_p
))
12189 /* Even if there is an in-class initialization, DECL
12190 is considered undefined until an out-of-class
12191 definition is provided, unless this is an inline
12193 DECL_EXTERNAL (decl
) = 1;
12197 CP_DECL_THREAD_LOCAL_P (decl
) = true;
12198 if (!processing_template_decl
)
12199 set_decl_tls_model (decl
, decl_default_tls_model (decl
));
12200 if (declspecs
->gnu_thread_keyword_p
)
12201 SET_DECL_GNU_TLS_P (decl
);
12207 error ("non-static data member %qE declared %<concept%>",
12209 else if (constexpr_p
)
12211 error ("non-static data member %qE declared %<constexpr%>",
12213 constexpr_p
= false;
12215 decl
= build_decl (input_location
,
12216 FIELD_DECL
, unqualified_id
, type
);
12217 DECL_NONADDRESSABLE_P (decl
) = bitfield
;
12218 if (bitfield
&& !unqualified_id
)
12220 TREE_NO_WARNING (decl
) = 1;
12221 DECL_PADDING_P (decl
) = 1;
12224 if (storage_class
== sc_mutable
)
12226 DECL_MUTABLE_P (decl
) = 1;
12227 storage_class
= sc_none
;
12232 /* An attempt is being made to initialize a non-static
12233 member. This is new in C++11. */
12234 maybe_warn_cpp0x (CPP0X_NSDMI
);
12236 /* If this has been parsed with static storage class, but
12237 errors forced staticp to be cleared, ensure NSDMI is
12239 if (declspecs
->storage_class
== sc_static
)
12240 DECL_INITIAL (decl
) = error_mark_node
;
12244 bad_specifiers (decl
, BSP_FIELD
, virtualp
,
12245 memfn_quals
!= TYPE_UNQUALIFIED
,
12246 staticp
? false : inlinep
, friendp
,
12247 raises
!= NULL_TREE
);
12250 else if (TREE_CODE (type
) == FUNCTION_TYPE
12251 || TREE_CODE (type
) == METHOD_TYPE
)
12253 tree original_name
;
12256 if (!unqualified_id
)
12257 return error_mark_node
;
12259 if (TREE_CODE (unqualified_id
) == TEMPLATE_ID_EXPR
)
12260 original_name
= dname
;
12262 original_name
= unqualified_id
;
12263 // FIXME:gcc_assert (original_name == dname);
12265 if (storage_class
== sc_auto
)
12266 error ("storage class %<auto%> invalid for function %qs", name
);
12267 else if (storage_class
== sc_register
)
12268 error ("storage class %<register%> invalid for function %qs", name
);
12271 if (declspecs
->gnu_thread_keyword_p
)
12272 error ("storage class %<__thread%> invalid for function %qs",
12275 error ("storage class %<thread_local%> invalid for function %qs",
12279 if (virt_specifiers
)
12280 error ("virt-specifiers in %qs not allowed outside a class definition", name
);
12281 /* Function declaration not at top level.
12282 Storage classes other than `extern' are not allowed
12283 and `extern' makes no difference. */
12284 if (! toplevel_bindings_p ()
12285 && (storage_class
== sc_static
12286 || decl_spec_seq_has_spec_p (declspecs
, ds_inline
))
12289 if (storage_class
== sc_static
)
12290 pedwarn (input_location
, OPT_Wpedantic
,
12291 "%<static%> specifier invalid for function %qs "
12292 "declared out of global scope", name
);
12294 pedwarn (input_location
, OPT_Wpedantic
,
12295 "%<inline%> specifier invalid for function %qs "
12296 "declared out of global scope", name
);
12299 if (ctype
== NULL_TREE
)
12303 error ("virtual non-class function %qs", name
);
12306 else if (sfk
== sfk_constructor
12307 || sfk
== sfk_destructor
)
12309 error (funcdef_flag
12310 ? G_("%qs defined in a non-class scope")
12311 : G_("%qs declared in a non-class scope"), name
);
12316 /* Record whether the function is public. */
12317 publicp
= (ctype
!= NULL_TREE
12318 || storage_class
!= sc_static
);
12320 if (late_return_type_p
)
12321 TYPE_HAS_LATE_RETURN_TYPE (type
) = 1;
12323 decl
= grokfndecl (ctype
, type
, original_name
, parms
, unqualified_id
,
12324 reqs
, virtualp
, flags
, memfn_quals
, rqual
, raises
,
12327 inlinep
| (2 * constexpr_p
) | (4 * concept_p
),
12328 initialized
== SD_DELETED
,
12331 template_count
, in_namespace
, attrlist
,
12332 declarator
->id_loc
);
12333 if (decl
== NULL_TREE
)
12334 return error_mark_node
;
12336 if (explicitp
== 2)
12337 DECL_NONCONVERTING_P (decl
) = 1;
12340 int invalid_static
= 0;
12342 /* Don't allow a static member function in a class, and forbid
12343 declaring main to be static. */
12344 if (TREE_CODE (type
) == METHOD_TYPE
)
12346 permerror (input_location
, "cannot declare member function %qD to have "
12347 "static linkage", decl
);
12348 invalid_static
= 1;
12350 else if (current_function_decl
)
12352 /* 7.1.1: There can be no static function declarations within a
12354 error ("cannot declare static function inside another function");
12355 invalid_static
= 1;
12358 if (invalid_static
)
12361 storage_class
= sc_none
;
12367 /* It's a variable. */
12369 /* An uninitialized decl with `extern' is a reference. */
12370 decl
= grokvardecl (type
, dname
, unqualified_id
,
12377 ctype
? ctype
: in_namespace
);
12378 if (decl
== NULL_TREE
)
12379 return error_mark_node
;
12381 bad_specifiers (decl
, BSP_VAR
, virtualp
,
12382 memfn_quals
!= TYPE_UNQUALIFIED
,
12383 inlinep
, friendp
, raises
!= NULL_TREE
);
12387 DECL_CONTEXT (decl
) = ctype
;
12390 permerror (input_location
, "%<static%> may not be used when defining "
12391 "(as opposed to declaring) a static data member");
12393 storage_class
= sc_none
;
12395 if (storage_class
== sc_register
&& TREE_STATIC (decl
))
12397 error ("static member %qD declared %<register%>", decl
);
12398 storage_class
= sc_none
;
12400 if (storage_class
== sc_extern
&& pedantic
)
12402 pedwarn (input_location
, OPT_Wpedantic
,
12403 "cannot explicitly declare member %q#D to have "
12404 "extern linkage", decl
);
12405 storage_class
= sc_none
;
12408 else if (constexpr_p
&& DECL_EXTERNAL (decl
))
12410 error ("declaration of %<constexpr%> variable %qD "
12411 "is not a definition", decl
);
12412 constexpr_p
= false;
12416 mark_inline_variable (decl
);
12417 if (innermost_code
== cdk_decomp
)
12419 gcc_assert (declarator
&& declarator
->kind
== cdk_decomp
);
12420 DECL_SOURCE_LOCATION (decl
) = declarator
->id_loc
;
12421 DECL_ARTIFICIAL (decl
) = 1;
12422 fit_decomposition_lang_decl (decl
, NULL_TREE
);
12426 if (VAR_P (decl
) && !initialized
)
12427 if (tree auto_node
= type_uses_auto (type
))
12428 if (!CLASS_PLACEHOLDER_TEMPLATE (auto_node
))
12430 location_t loc
= declspecs
->locations
[ds_type_spec
];
12431 error_at (loc
, "declaration of %q#D has no initializer", decl
);
12432 TREE_TYPE (decl
) = error_mark_node
;
12435 if (storage_class
== sc_extern
&& initialized
&& !funcdef_flag
)
12437 if (toplevel_bindings_p ())
12439 /* It's common practice (and completely valid) to have a const
12440 be initialized and declared extern. */
12441 if (!(type_quals
& TYPE_QUAL_CONST
))
12442 warning (0, "%qs initialized and declared %<extern%>", name
);
12446 error ("%qs has both %<extern%> and initializer", name
);
12447 return error_mark_node
;
12451 /* Record `register' declaration for warnings on &
12452 and in case doing stupid register allocation. */
12454 if (storage_class
== sc_register
)
12456 DECL_REGISTER (decl
) = 1;
12457 /* Warn about register storage specifiers on PARM_DECLs. */
12458 if (TREE_CODE (decl
) == PARM_DECL
)
12460 if (cxx_dialect
>= cxx17
)
12461 pedwarn (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
12462 "ISO C++17 does not allow %<register%> storage "
12463 "class specifier");
12465 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
12466 "%<register%> storage class specifier used");
12469 else if (storage_class
== sc_extern
)
12470 DECL_THIS_EXTERN (decl
) = 1;
12471 else if (storage_class
== sc_static
)
12472 DECL_THIS_STATIC (decl
) = 1;
12474 /* Set constexpr flag on vars (functions got it in grokfndecl). */
12475 if (constexpr_p
&& VAR_P (decl
))
12476 DECL_DECLARED_CONSTEXPR_P (decl
) = true;
12478 /* Record constancy and volatility on the DECL itself . There's
12479 no need to do this when processing a template; we'll do this
12480 for the instantiated declaration based on the type of DECL. */
12481 if (!processing_template_decl
)
12482 cp_apply_type_quals_to_decl (type_quals
, decl
);
12488 /* Subroutine of start_function. Ensure that each of the parameter
12489 types (as listed in PARMS) is complete, as is required for a
12490 function definition. */
12493 require_complete_types_for_parms (tree parms
)
12495 for (; parms
; parms
= DECL_CHAIN (parms
))
12497 if (dependent_type_p (TREE_TYPE (parms
)))
12499 if (!VOID_TYPE_P (TREE_TYPE (parms
))
12500 && complete_type_or_else (TREE_TYPE (parms
), parms
))
12502 relayout_decl (parms
);
12503 DECL_ARG_TYPE (parms
) = type_passed_as (TREE_TYPE (parms
));
12505 maybe_warn_parm_abi (TREE_TYPE (parms
),
12506 DECL_SOURCE_LOCATION (parms
));
12509 /* grokparms or complete_type_or_else will have already issued
12511 TREE_TYPE (parms
) = error_mark_node
;
12515 /* Returns nonzero if T is a local variable. */
12518 local_variable_p (const_tree t
)
12521 /* A VAR_DECL with a context that is a _TYPE is a static data
12523 && !TYPE_P (CP_DECL_CONTEXT (t
))
12524 /* Any other non-local variable must be at namespace scope. */
12525 && !DECL_NAMESPACE_SCOPE_P (t
))
12526 || (TREE_CODE (t
) == PARM_DECL
))
12532 /* Like local_variable_p, but suitable for use as a tree-walking
12536 local_variable_p_walkfn (tree
*tp
, int *walk_subtrees
,
12539 if (local_variable_p (*tp
)
12540 && (!DECL_ARTIFICIAL (*tp
) || DECL_NAME (*tp
) == this_identifier
))
12542 else if (TYPE_P (*tp
))
12543 *walk_subtrees
= 0;
12548 /* Check that ARG, which is a default-argument expression for a
12549 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
12550 something goes wrong. DECL may also be a _TYPE node, rather than a
12551 DECL, if there is no DECL available. */
12554 check_default_argument (tree decl
, tree arg
, tsubst_flags_t complain
)
12559 if (TREE_CODE (arg
) == DEFAULT_ARG
)
12560 /* We get a DEFAULT_ARG when looking at an in-class declaration
12561 with a default argument. Ignore the argument for now; we'll
12562 deal with it after the class is complete. */
12571 decl_type
= TREE_TYPE (decl
);
12573 if (arg
== error_mark_node
12574 || decl
== error_mark_node
12575 || TREE_TYPE (arg
) == error_mark_node
12576 || decl_type
== error_mark_node
)
12577 /* Something already went wrong. There's no need to check
12579 return error_mark_node
;
12581 /* [dcl.fct.default]
12583 A default argument expression is implicitly converted to the
12585 ++cp_unevaluated_operand
;
12586 perform_implicit_conversion_flags (decl_type
, arg
, complain
,
12588 --cp_unevaluated_operand
;
12590 /* Avoid redundant -Wzero-as-null-pointer-constant warnings at
12592 if (TYPE_PTR_OR_PTRMEM_P (decl_type
)
12593 && null_ptr_cst_p (arg
))
12594 return nullptr_node
;
12596 /* [dcl.fct.default]
12598 Local variables shall not be used in default argument
12601 The keyword `this' shall not be used in a default argument of a
12602 member function. */
12603 var
= cp_walk_tree_without_duplicates (&arg
, local_variable_p_walkfn
, NULL
);
12606 if (complain
& tf_warning_or_error
)
12608 if (DECL_NAME (var
) == this_identifier
)
12609 permerror (input_location
, "default argument %qE uses %qD",
12612 error ("default argument %qE uses local variable %qD", arg
, var
);
12614 return error_mark_node
;
12621 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
12624 type_is_deprecated (tree type
)
12626 enum tree_code code
;
12627 if (TREE_DEPRECATED (type
))
12629 if (TYPE_NAME (type
))
12631 if (TREE_DEPRECATED (TYPE_NAME (type
)))
12637 /* Do warn about using typedefs to a deprecated class. */
12638 if (OVERLOAD_TYPE_P (type
) && type
!= TYPE_MAIN_VARIANT (type
))
12639 return type_is_deprecated (TYPE_MAIN_VARIANT (type
));
12641 code
= TREE_CODE (type
);
12643 if (code
== POINTER_TYPE
|| code
== REFERENCE_TYPE
12644 || code
== OFFSET_TYPE
|| code
== FUNCTION_TYPE
12645 || code
== METHOD_TYPE
|| code
== ARRAY_TYPE
)
12646 return type_is_deprecated (TREE_TYPE (type
));
12648 if (TYPE_PTRMEMFUNC_P (type
))
12649 return type_is_deprecated
12650 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type
))));
12655 /* Decode the list of parameter types for a function type.
12656 Given the list of things declared inside the parens,
12657 return a list of types.
12659 If this parameter does not end with an ellipsis, we append
12662 *PARMS is set to the chain of PARM_DECLs created. */
12665 grokparms (tree parmlist
, tree
*parms
)
12667 tree result
= NULL_TREE
;
12668 tree decls
= NULL_TREE
;
12672 for (parm
= parmlist
; parm
!= NULL_TREE
; parm
= TREE_CHAIN (parm
))
12674 tree type
= NULL_TREE
;
12675 tree init
= TREE_PURPOSE (parm
);
12676 tree decl
= TREE_VALUE (parm
);
12678 if (parm
== void_list_node
)
12681 if (! decl
|| TREE_TYPE (decl
) == error_mark_node
)
12684 type
= TREE_TYPE (decl
);
12685 if (VOID_TYPE_P (type
))
12687 if (same_type_p (type
, void_type_node
)
12689 && !DECL_NAME (decl
) && !result
12690 && TREE_CHAIN (parm
) == void_list_node
)
12691 /* DR 577: A parameter list consisting of a single
12692 unnamed parameter of non-dependent type 'void'. */
12694 else if (cv_qualified_p (type
))
12695 error_at (DECL_SOURCE_LOCATION (decl
),
12696 "invalid use of cv-qualified type %qT in "
12697 "parameter declaration", type
);
12699 error_at (DECL_SOURCE_LOCATION (decl
),
12700 "invalid use of type %<void%> in parameter "
12702 /* It's not a good idea to actually create parameters of
12703 type `void'; other parts of the compiler assume that a
12704 void type terminates the parameter list. */
12705 type
= error_mark_node
;
12706 TREE_TYPE (decl
) = error_mark_node
;
12709 if (type
!= error_mark_node
)
12711 if (deprecated_state
!= DEPRECATED_SUPPRESS
)
12713 tree deptype
= type_is_deprecated (type
);
12715 warn_deprecated_use (deptype
, NULL_TREE
);
12718 /* Top-level qualifiers on the parameters are
12719 ignored for function types. */
12720 type
= cp_build_qualified_type (type
, 0);
12721 if (TREE_CODE (type
) == METHOD_TYPE
)
12723 error ("parameter %qD invalidly declared method type", decl
);
12724 type
= build_pointer_type (type
);
12725 TREE_TYPE (decl
) = type
;
12727 else if (abstract_virtuals_error (decl
, type
))
12728 any_error
= 1; /* Seems like a good idea. */
12729 else if (cxx_dialect
< cxx17
&& POINTER_TYPE_P (type
))
12731 /* Before C++17 DR 393:
12732 [dcl.fct]/6, parameter types cannot contain pointers
12733 (references) to arrays of unknown bound. */
12734 tree t
= TREE_TYPE (type
);
12735 int ptr
= TYPE_PTR_P (type
);
12739 if (TYPE_PTR_P (t
))
12741 else if (TREE_CODE (t
) != ARRAY_TYPE
)
12743 else if (!TYPE_DOMAIN (t
))
12747 if (TREE_CODE (t
) == ARRAY_TYPE
)
12748 pedwarn (DECL_SOURCE_LOCATION (decl
), OPT_Wpedantic
,
12750 ? G_("parameter %qD includes pointer to array of "
12751 "unknown bound %qT")
12752 : G_("parameter %qD includes reference to array of "
12753 "unknown bound %qT"),
12759 else if (init
&& !processing_template_decl
)
12760 init
= check_default_argument (decl
, init
, tf_warning_or_error
);
12763 DECL_CHAIN (decl
) = decls
;
12765 result
= tree_cons (init
, type
, result
);
12767 decls
= nreverse (decls
);
12768 result
= nreverse (result
);
12770 result
= chainon (result
, void_list_node
);
12777 /* D is a constructor or overloaded `operator='.
12779 Let T be the class in which D is declared. Then, this function
12782 -1 if D's is an ill-formed constructor or copy assignment operator
12783 whose first parameter is of type `T'.
12784 0 if D is not a copy constructor or copy assignment
12786 1 if D is a copy constructor or copy assignment operator whose
12787 first parameter is a reference to non-const qualified T.
12788 2 if D is a copy constructor or copy assignment operator whose
12789 first parameter is a reference to const qualified T.
12791 This function can be used as a predicate. Positive values indicate
12792 a copy constructor and nonzero values indicate a copy assignment
12796 copy_fn_p (const_tree d
)
12802 gcc_assert (DECL_FUNCTION_MEMBER_P (d
));
12804 if (TREE_CODE (d
) == TEMPLATE_DECL
12805 || (DECL_TEMPLATE_INFO (d
)
12806 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d
))))
12807 /* Instantiations of template member functions are never copy
12808 functions. Note that member functions of templated classes are
12809 represented as template functions internally, and we must
12810 accept those as copy functions. */
12813 args
= FUNCTION_FIRST_USER_PARMTYPE (d
);
12817 arg_type
= TREE_VALUE (args
);
12818 if (arg_type
== error_mark_node
)
12821 if (TYPE_MAIN_VARIANT (arg_type
) == DECL_CONTEXT (d
))
12823 /* Pass by value copy assignment operator. */
12826 else if (TREE_CODE (arg_type
) == REFERENCE_TYPE
12827 && !TYPE_REF_IS_RVALUE (arg_type
)
12828 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type
)) == DECL_CONTEXT (d
))
12830 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type
)))
12836 args
= TREE_CHAIN (args
);
12838 if (args
&& args
!= void_list_node
&& !TREE_PURPOSE (args
))
12839 /* There are more non-optional args. */
12845 /* D is a constructor or overloaded `operator='.
12847 Let T be the class in which D is declared. Then, this function
12848 returns true when D is a move constructor or move assignment
12849 operator, false otherwise. */
12852 move_fn_p (const_tree d
)
12854 gcc_assert (DECL_FUNCTION_MEMBER_P (d
));
12856 if (cxx_dialect
== cxx98
)
12857 /* There are no move constructors if we are in C++98 mode. */
12860 if (TREE_CODE (d
) == TEMPLATE_DECL
12861 || (DECL_TEMPLATE_INFO (d
)
12862 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d
))))
12863 /* Instantiations of template member functions are never move
12864 functions. Note that member functions of templated classes are
12865 represented as template functions internally, and we must
12866 accept those as move functions. */
12869 return move_signature_fn_p (d
);
12872 /* D is a constructor or overloaded `operator='.
12874 Then, this function returns true when D has the same signature as a move
12875 constructor or move assignment operator (because either it is such a
12876 ctor/op= or it is a template specialization with the same signature),
12877 false otherwise. */
12880 move_signature_fn_p (const_tree d
)
12884 bool result
= false;
12886 args
= FUNCTION_FIRST_USER_PARMTYPE (d
);
12890 arg_type
= TREE_VALUE (args
);
12891 if (arg_type
== error_mark_node
)
12894 if (TREE_CODE (arg_type
) == REFERENCE_TYPE
12895 && TYPE_REF_IS_RVALUE (arg_type
)
12896 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type
)),
12900 args
= TREE_CHAIN (args
);
12902 if (args
&& args
!= void_list_node
&& !TREE_PURPOSE (args
))
12903 /* There are more non-optional args. */
12909 /* Remember any special properties of member function DECL. */
12912 grok_special_member_properties (tree decl
)
12916 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl
))
12919 class_type
= DECL_CONTEXT (decl
);
12920 if (IDENTIFIER_CTOR_P (DECL_NAME (decl
)))
12922 int ctor
= copy_fn_p (decl
);
12924 if (!DECL_ARTIFICIAL (decl
))
12925 TYPE_HAS_USER_CONSTRUCTOR (class_type
) = 1;
12931 A non-template constructor for class X is a copy
12932 constructor if its first parameter is of type X&, const
12933 X&, volatile X& or const volatile X&, and either there
12934 are no other parameters or else all other parameters have
12935 default arguments. */
12936 TYPE_HAS_COPY_CTOR (class_type
) = 1;
12937 if (user_provided_p (decl
))
12938 TYPE_HAS_COMPLEX_COPY_CTOR (class_type
) = 1;
12940 TYPE_HAS_CONST_COPY_CTOR (class_type
) = 1;
12942 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl
)))
12943 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type
) = 1;
12944 else if (move_fn_p (decl
) && user_provided_p (decl
))
12945 TYPE_HAS_COMPLEX_MOVE_CTOR (class_type
) = 1;
12946 else if (is_list_ctor (decl
))
12947 TYPE_HAS_LIST_CTOR (class_type
) = 1;
12949 if (DECL_DECLARED_CONSTEXPR_P (decl
)
12950 && !ctor
&& !move_fn_p (decl
))
12951 TYPE_HAS_CONSTEXPR_CTOR (class_type
) = 1;
12953 else if (DECL_NAME (decl
) == assign_op_identifier
)
12957 A non-template assignment operator for class X is a copy
12958 assignment operator if its parameter is of type X, X&, const
12959 X&, volatile X& or const volatile X&. */
12961 int assop
= copy_fn_p (decl
);
12965 TYPE_HAS_COPY_ASSIGN (class_type
) = 1;
12966 if (user_provided_p (decl
))
12967 TYPE_HAS_COMPLEX_COPY_ASSIGN (class_type
) = 1;
12969 TYPE_HAS_CONST_COPY_ASSIGN (class_type
) = 1;
12971 else if (move_fn_p (decl
) && user_provided_p (decl
))
12972 TYPE_HAS_COMPLEX_MOVE_ASSIGN (class_type
) = 1;
12974 else if (IDENTIFIER_CONV_OP_P (DECL_NAME (decl
)))
12975 TYPE_HAS_CONVERSION (class_type
) = true;
12977 /* Destructors are handled in check_methods. */
12980 /* Check a constructor DECL has the correct form. Complains
12981 if the class has a constructor of the form X(X). */
12984 grok_ctor_properties (const_tree ctype
, const_tree decl
)
12986 int ctor_parm
= copy_fn_p (decl
);
12992 A declaration of a constructor for a class X is ill-formed if
12993 its first parameter is of type (optionally cv-qualified) X
12994 and either there are no other parameters or else all other
12995 parameters have default arguments.
12997 We *don't* complain about member template instantiations that
12998 have this form, though; they can occur as we try to decide
12999 what constructor to use during overload resolution. Since
13000 overload resolution will never prefer such a constructor to
13001 the non-template copy constructor (which is either explicitly
13002 or implicitly defined), there's no need to worry about their
13003 existence. Theoretically, they should never even be
13004 instantiated, but that's hard to forestall. */
13005 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
13013 /* DECL is a declaration for an overloaded or conversion operator. If
13014 COMPLAIN is true, errors are issued for invalid declarations. */
13017 grok_op_properties (tree decl
, bool complain
)
13019 tree argtypes
= TYPE_ARG_TYPES (TREE_TYPE (decl
));
13020 bool methodp
= TREE_CODE (TREE_TYPE (decl
)) == METHOD_TYPE
;
13021 tree name
= DECL_NAME (decl
);
13023 tree class_type
= DECL_CONTEXT (decl
);
13024 if (class_type
&& !CLASS_TYPE_P (class_type
))
13025 class_type
= NULL_TREE
;
13027 tree_code operator_code
;
13029 if (IDENTIFIER_CONV_OP_P (name
))
13031 /* Conversion operators are TYPE_EXPR for the purposes of this
13033 operator_code
= TYPE_EXPR
;
13034 op_flags
= OVL_OP_FLAG_UNARY
;
13038 const ovl_op_info_t
*ovl_op
= IDENTIFIER_OVL_OP_INFO (name
);
13040 operator_code
= ovl_op
->tree_code
;
13041 op_flags
= ovl_op
->flags
;
13042 gcc_checking_assert (operator_code
!= ERROR_MARK
);
13043 DECL_OVERLOADED_OPERATOR_CODE_RAW (decl
) = ovl_op
->ovl_op_code
;
13046 if (op_flags
& OVL_OP_FLAG_ALLOC
)
13048 /* operator new and operator delete are quite special. */
13052 case OVL_OP_FLAG_ALLOC
:
13053 TYPE_HAS_NEW_OPERATOR (class_type
) = 1;
13056 case OVL_OP_FLAG_ALLOC
| OVL_OP_FLAG_DELETE
:
13057 TYPE_GETS_DELETE (class_type
) |= 1;
13060 case OVL_OP_FLAG_ALLOC
| OVL_OP_FLAG_VEC
:
13061 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type
) = 1;
13064 case OVL_OP_FLAG_ALLOC
| OVL_OP_FLAG_DELETE
| OVL_OP_FLAG_VEC
:
13065 TYPE_GETS_DELETE (class_type
) |= 2;
13069 gcc_unreachable ();
13072 /* [basic.std.dynamic.allocation]/1:
13074 A program is ill-formed if an allocation function is declared
13075 in a namespace scope other than global scope or declared
13076 static in global scope.
13078 The same also holds true for deallocation functions. */
13079 if (DECL_NAMESPACE_SCOPE_P (decl
))
13081 if (CP_DECL_CONTEXT (decl
) != global_namespace
)
13083 error ("%qD may not be declared within a namespace", decl
);
13087 if (!TREE_PUBLIC (decl
))
13089 error ("%qD may not be declared as static", decl
);
13094 if (op_flags
& OVL_OP_FLAG_DELETE
)
13095 TREE_TYPE (decl
) = coerce_delete_type (TREE_TYPE (decl
));
13098 DECL_IS_OPERATOR_NEW (decl
) = 1;
13099 TREE_TYPE (decl
) = coerce_new_type (TREE_TYPE (decl
));
13105 /* An operator function must either be a non-static member function
13106 or have at least one parameter of a class, a reference to a class,
13107 an enumeration, or a reference to an enumeration. 13.4.0.6 */
13108 if (! methodp
|| DECL_STATIC_FUNCTION_P (decl
))
13110 if (operator_code
== TYPE_EXPR
13111 || operator_code
== CALL_EXPR
13112 || operator_code
== COMPONENT_REF
13113 || operator_code
== ARRAY_REF
13114 || operator_code
== NOP_EXPR
)
13116 error ("%qD must be a nonstatic member function", decl
);
13120 if (DECL_STATIC_FUNCTION_P (decl
))
13122 error ("%qD must be either a non-static member "
13123 "function or a non-member function", decl
);
13127 for (tree arg
= argtypes
; ; arg
= TREE_CHAIN (arg
))
13129 if (!arg
|| arg
== void_list_node
)
13132 error ("%qD must have an argument of class or "
13133 "enumerated type", decl
);
13137 tree type
= non_reference (TREE_VALUE (arg
));
13138 if (type
== error_mark_node
)
13141 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
13142 because these checks are performed even on template
13144 if (MAYBE_CLASS_TYPE_P (type
)
13145 || TREE_CODE (type
) == ENUMERAL_TYPE
)
13150 if (operator_code
== CALL_EXPR
)
13151 /* There are no further restrictions on the arguments to an overloaded
13155 if (operator_code
== COND_EXPR
)
13158 error ("ISO C++ prohibits overloading operator ?:");
13162 /* Count the number of arguments and check for ellipsis. */
13164 for (tree arg
= argtypes
; arg
!= void_list_node
; arg
= TREE_CHAIN (arg
))
13169 error ("%qD must not have variable number of arguments", decl
);
13175 /* Verify correct number of arguments. */
13178 case OVL_OP_FLAG_AMBIARY
:
13181 /* We have a unary instance of an ambi-ary op. Remap to the
13183 unsigned alt
= ovl_op_alternate
[ovl_op_mapping
[operator_code
]];
13184 const ovl_op_info_t
*ovl_op
= &ovl_op_info
[false][alt
];
13185 gcc_checking_assert (ovl_op
->flags
== OVL_OP_FLAG_UNARY
);
13186 operator_code
= ovl_op
->tree_code
;
13187 DECL_OVERLOADED_OPERATOR_CODE_RAW (decl
) = ovl_op
->ovl_op_code
;
13189 else if (arity
!= 2)
13191 /* This was an ambiguous operator but is invalid. */
13193 ? G_("%qD must have either zero or one argument")
13194 : G_("%qD must have either one or two arguments"), decl
);
13197 else if ((operator_code
== POSTINCREMENT_EXPR
13198 || operator_code
== POSTDECREMENT_EXPR
)
13199 && ! processing_template_decl
13200 /* x++ and x--'s second argument must be an int. */
13201 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes
)),
13202 integer_type_node
))
13205 ? G_("postfix %qD must have %<int%> as its argument")
13206 : G_("postfix %qD must have %<int%> as its second argument"),
13212 case OVL_OP_FLAG_UNARY
:
13216 ? G_("%qD must have no arguments")
13217 : G_("%qD must have exactly one argument"), decl
);
13222 case OVL_OP_FLAG_BINARY
:
13226 ? G_("%qD must have exactly one argument")
13227 : G_("%qD must have exactly two arguments"), decl
);
13233 gcc_unreachable ();
13236 /* There can be no default arguments. */
13237 for (tree arg
= argtypes
; arg
!= void_list_node
; arg
= TREE_CHAIN (arg
))
13238 if (TREE_PURPOSE (arg
))
13240 TREE_PURPOSE (arg
) = NULL_TREE
;
13241 if (operator_code
== POSTINCREMENT_EXPR
13242 || operator_code
== POSTDECREMENT_EXPR
)
13243 pedwarn (input_location
, OPT_Wpedantic
,
13244 "%qD cannot have default arguments", decl
);
13247 error ("%qD cannot have default arguments", decl
);
13252 /* At this point the declaration is well-formed. It may not be
13253 sensible though. */
13255 /* Check member function warnings only on the in-class declaration.
13256 There's no point warning on an out-of-class definition. */
13257 if (class_type
&& class_type
!= current_class_type
)
13260 /* Warn about conversion operators that will never be used. */
13261 if (IDENTIFIER_CONV_OP_P (name
)
13262 && ! DECL_TEMPLATE_INFO (decl
)
13263 && warn_conversion
)
13265 tree t
= TREE_TYPE (name
);
13266 int ref
= (TREE_CODE (t
) == REFERENCE_TYPE
);
13269 t
= TYPE_MAIN_VARIANT (TREE_TYPE (t
));
13271 if (VOID_TYPE_P (t
))
13272 warning (OPT_Wconversion
,
13274 ? G_("conversion to a reference to void "
13275 "will never use a type conversion operator")
13276 : G_("conversion to void "
13277 "will never use a type conversion operator"));
13278 else if (class_type
)
13280 if (t
== class_type
)
13281 warning (OPT_Wconversion
,
13283 ? G_("conversion to a reference to the same type "
13284 "will never use a type conversion operator")
13285 : G_("conversion to the same type "
13286 "will never use a type conversion operator"));
13287 /* Don't force t to be complete here. */
13288 else if (MAYBE_CLASS_TYPE_P (t
)
13289 && COMPLETE_TYPE_P (t
)
13290 && DERIVED_FROM_P (t
, class_type
))
13291 warning (OPT_Wconversion
,
13293 ? G_("conversion to a reference to a base class "
13294 "will never use a type conversion operator")
13295 : G_("conversion to a base class "
13296 "will never use a type conversion operator"));
13303 /* Effective C++ rules below. */
13305 /* More Effective C++ rule 7. */
13306 if (operator_code
== TRUTH_ANDIF_EXPR
13307 || operator_code
== TRUTH_ORIF_EXPR
13308 || operator_code
== COMPOUND_EXPR
)
13309 warning (OPT_Weffc__
,
13310 "user-defined %qD always evaluates both arguments", decl
);
13312 /* More Effective C++ rule 6. */
13313 if (operator_code
== POSTINCREMENT_EXPR
13314 || operator_code
== POSTDECREMENT_EXPR
13315 || operator_code
== PREINCREMENT_EXPR
13316 || operator_code
== PREDECREMENT_EXPR
)
13318 tree arg
= TREE_VALUE (argtypes
);
13319 tree ret
= TREE_TYPE (TREE_TYPE (decl
));
13320 if (methodp
|| TREE_CODE (arg
) == REFERENCE_TYPE
)
13321 arg
= TREE_TYPE (arg
);
13322 arg
= TYPE_MAIN_VARIANT (arg
);
13324 if (operator_code
== PREINCREMENT_EXPR
13325 || operator_code
== PREDECREMENT_EXPR
)
13327 if (TREE_CODE (ret
) != REFERENCE_TYPE
13328 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret
)), arg
))
13329 warning (OPT_Weffc__
, "prefix %qD should return %qT", decl
,
13330 build_reference_type (arg
));
13334 if (!same_type_p (TYPE_MAIN_VARIANT (ret
), arg
))
13335 warning (OPT_Weffc__
, "postfix %qD should return %qT", decl
, arg
);
13339 /* Effective C++ rule 23. */
13340 if (!DECL_ASSIGNMENT_OPERATOR_P (decl
)
13341 && (operator_code
== PLUS_EXPR
13342 || operator_code
== MINUS_EXPR
13343 || operator_code
== TRUNC_DIV_EXPR
13344 || operator_code
== MULT_EXPR
13345 || operator_code
== TRUNC_MOD_EXPR
)
13346 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl
))) == REFERENCE_TYPE
)
13347 warning (OPT_Weffc__
, "%qD should return by value", decl
);
13352 /* Return a string giving the keyword associate with CODE. */
13354 static const char *
13355 tag_name (enum tag_types code
)
13367 case typename_type
:
13370 gcc_unreachable ();
13374 /* Name lookup in an elaborated-type-specifier (after the keyword
13375 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
13376 elaborated-type-specifier is invalid, issue a diagnostic and return
13377 error_mark_node; otherwise, return the *_TYPE to which it referred.
13378 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
13381 check_elaborated_type_specifier (enum tag_types tag_code
,
13383 bool allow_template_p
)
13389 struct S { struct S *p; };
13391 name lookup will find the TYPE_DECL for the implicit "S::S"
13392 typedef. Adjust for that here. */
13393 if (DECL_SELF_REFERENCE_P (decl
))
13394 decl
= TYPE_NAME (TREE_TYPE (decl
));
13396 type
= TREE_TYPE (decl
);
13398 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
13399 is false for this case as well. */
13400 if (TREE_CODE (type
) == TEMPLATE_TYPE_PARM
)
13402 error ("using template type parameter %qT after %qs",
13403 type
, tag_name (tag_code
));
13404 return error_mark_node
;
13406 /* Accept template template parameters. */
13407 else if (allow_template_p
13408 && (TREE_CODE (type
) == BOUND_TEMPLATE_TEMPLATE_PARM
13409 || TREE_CODE (type
) == TEMPLATE_TEMPLATE_PARM
))
13413 If the identifier resolves to a typedef-name or the
13414 simple-template-id resolves to an alias template
13415 specialization, the elaborated-type-specifier is ill-formed.
13417 In other words, the only legitimate declaration to use in the
13418 elaborated type specifier is the implicit typedef created when
13419 the type is declared. */
13420 else if (!DECL_IMPLICIT_TYPEDEF_P (decl
)
13421 && !DECL_SELF_REFERENCE_P (decl
)
13422 && tag_code
!= typename_type
)
13424 if (alias_template_specialization_p (type
))
13425 error ("using alias template specialization %qT after %qs",
13426 type
, tag_name (tag_code
));
13428 error ("using typedef-name %qD after %qs", decl
, tag_name (tag_code
));
13429 inform (DECL_SOURCE_LOCATION (decl
),
13430 "%qD has a previous declaration here", decl
);
13431 return error_mark_node
;
13433 else if (TREE_CODE (type
) != RECORD_TYPE
13434 && TREE_CODE (type
) != UNION_TYPE
13435 && tag_code
!= enum_type
13436 && tag_code
!= typename_type
)
13438 error ("%qT referred to as %qs", type
, tag_name (tag_code
));
13439 inform (location_of (type
), "%qT has a previous declaration here", type
);
13440 return error_mark_node
;
13442 else if (TREE_CODE (type
) != ENUMERAL_TYPE
13443 && tag_code
== enum_type
)
13445 error ("%qT referred to as enum", type
);
13446 inform (location_of (type
), "%qT has a previous declaration here", type
);
13447 return error_mark_node
;
13449 else if (!allow_template_p
13450 && TREE_CODE (type
) == RECORD_TYPE
13451 && CLASSTYPE_IS_TEMPLATE (type
))
13453 /* If a class template appears as elaborated type specifier
13454 without a template header such as:
13456 template <class T> class C {};
13457 void f(class C); // No template header here
13459 then the required template argument is missing. */
13460 error ("template argument required for %<%s %T%>",
13461 tag_name (tag_code
),
13462 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type
)));
13463 return error_mark_node
;
13469 /* Lookup NAME in elaborate type specifier in scope according to
13470 SCOPE and issue diagnostics if necessary.
13471 Return *_TYPE node upon success, NULL_TREE when the NAME is not
13472 found, and ERROR_MARK_NODE for type error. */
13475 lookup_and_check_tag (enum tag_types tag_code
, tree name
,
13476 tag_scope scope
, bool template_header_p
)
13480 if (scope
== ts_global
)
13482 /* First try ordinary name lookup, ignoring hidden class name
13483 injected via friend declaration. */
13484 decl
= lookup_name_prefer_type (name
, 2);
13485 decl
= strip_using_decl (decl
);
13486 /* If that fails, the name will be placed in the smallest
13487 non-class, non-function-prototype scope according to 3.3.1/5.
13488 We may already have a hidden name declared as friend in this
13489 scope. So lookup again but not ignoring hidden names.
13490 If we find one, that name will be made visible rather than
13491 creating a new tag. */
13493 decl
= lookup_type_scope (name
, ts_within_enclosing_non_class
);
13496 decl
= lookup_type_scope (name
, scope
);
13499 && (DECL_CLASS_TEMPLATE_P (decl
)
13500 /* If scope is ts_current we're defining a class, so ignore a
13501 template template parameter. */
13502 || (scope
!= ts_current
13503 && DECL_TEMPLATE_TEMPLATE_PARM_P (decl
))))
13504 decl
= DECL_TEMPLATE_RESULT (decl
);
13506 if (decl
&& TREE_CODE (decl
) == TYPE_DECL
)
13508 /* Look for invalid nested type:
13512 if (scope
== ts_current
&& DECL_SELF_REFERENCE_P (decl
))
13514 error ("%qD has the same name as the class in which it is "
13517 return error_mark_node
;
13520 /* Two cases we need to consider when deciding if a class
13521 template is allowed as an elaborated type specifier:
13522 1. It is a self reference to its own class.
13523 2. It comes with a template header.
13527 template <class T> class C {
13528 class C *c1; // DECL_SELF_REFERENCE_P is true
13531 template <class U> class C; // template_header_p is true
13532 template <class T> class C<T>::D {
13533 class C *c2; // DECL_SELF_REFERENCE_P is true
13536 t
= check_elaborated_type_specifier (tag_code
,
13539 | DECL_SELF_REFERENCE_P (decl
));
13540 if (template_header_p
&& t
&& CLASS_TYPE_P (t
)
13541 && (!CLASSTYPE_TEMPLATE_INFO (t
)
13542 || (!PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t
)))))
13544 error ("%qT is not a template", t
);
13545 inform (location_of (t
), "previous declaration here");
13546 if (TYPE_CLASS_SCOPE_P (t
)
13547 && CLASSTYPE_TEMPLATE_INFO (TYPE_CONTEXT (t
)))
13548 inform (input_location
,
13549 "perhaps you want to explicitly add %<%T::%>",
13551 t
= error_mark_node
;
13556 else if (decl
&& TREE_CODE (decl
) == TREE_LIST
)
13558 error ("reference to %qD is ambiguous", name
);
13559 print_candidates (decl
);
13560 return error_mark_node
;
13566 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
13567 Define the tag as a forward-reference if it is not defined.
13569 If a declaration is given, process it here, and report an error if
13570 multiple declarations are not identical.
13572 SCOPE is TS_CURRENT when this is also a definition. Only look in
13573 the current frame for the name (since C++ allows new names in any
13574 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
13575 declaration. Only look beginning from the current scope outward up
13576 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
13578 TEMPLATE_HEADER_P is true when this declaration is preceded by
13579 a set of template parameters. */
13582 xref_tag_1 (enum tag_types tag_code
, tree name
,
13583 tag_scope scope
, bool template_header_p
)
13585 enum tree_code code
;
13586 tree context
= NULL_TREE
;
13588 gcc_assert (identifier_p (name
));
13594 code
= RECORD_TYPE
;
13600 code
= ENUMERAL_TYPE
;
13603 gcc_unreachable ();
13606 /* In case of anonymous name, xref_tag is only called to
13607 make type node and push name. Name lookup is not required. */
13608 tree t
= NULL_TREE
;
13609 if (scope
!= ts_lambda
&& !anon_aggrname_p (name
))
13610 t
= lookup_and_check_tag (tag_code
, name
, scope
, template_header_p
);
13612 if (t
== error_mark_node
)
13613 return error_mark_node
;
13615 if (scope
!= ts_current
&& t
&& current_class_type
13616 && template_class_depth (current_class_type
)
13617 && template_header_p
)
13619 if (TREE_CODE (t
) == TEMPLATE_TEMPLATE_PARM
)
13622 /* Since SCOPE is not TS_CURRENT, we are not looking at a
13623 definition of this tag. Since, in addition, we are currently
13624 processing a (member) template declaration of a template
13625 class, we must be very careful; consider:
13627 template <class X> struct S1
13629 template <class U> struct S2
13631 template <class V> friend struct S1;
13634 Here, the S2::S1 declaration should not be confused with the
13635 outer declaration. In particular, the inner version should
13636 have a template parameter of level 2, not level 1.
13638 On the other hand, when presented with:
13640 template <class T> struct S1
13642 template <class U> struct S2 {};
13643 template <class U> friend struct S2;
13646 the friend must find S1::S2 eventually. We accomplish this
13647 by making sure that the new type we create to represent this
13648 declaration has the right TYPE_CONTEXT. */
13649 context
= TYPE_CONTEXT (t
);
13655 /* If no such tag is yet defined, create a forward-reference node
13656 and record it as the "definition".
13657 When a real declaration of this type is found,
13658 the forward-reference will be altered into a real type. */
13659 if (code
== ENUMERAL_TYPE
)
13661 error ("use of enum %q#D without previous declaration", name
);
13662 return error_mark_node
;
13666 t
= make_class_type (code
);
13667 TYPE_CONTEXT (t
) = context
;
13668 if (scope
== ts_lambda
)
13670 /* Mark it as a lambda type. */
13671 CLASSTYPE_LAMBDA_EXPR (t
) = error_mark_node
;
13672 /* And push it into current scope. */
13673 scope
= ts_current
;
13675 t
= pushtag (name
, t
, scope
);
13680 if (template_header_p
&& MAYBE_CLASS_TYPE_P (t
))
13682 /* Check that we aren't trying to overload a class with different
13684 tree constr
= NULL_TREE
;
13685 if (current_template_parms
)
13687 tree reqs
= TEMPLATE_PARMS_CONSTRAINTS (current_template_parms
);
13688 constr
= build_constraints (reqs
, NULL_TREE
);
13690 if (!redeclare_class_template (t
, current_template_parms
, constr
))
13691 return error_mark_node
;
13693 else if (!processing_template_decl
13694 && CLASS_TYPE_P (t
)
13695 && CLASSTYPE_IS_TEMPLATE (t
))
13697 error ("redeclaration of %qT as a non-template", t
);
13698 inform (location_of (t
), "previous declaration %qD", t
);
13699 return error_mark_node
;
13702 if (scope
!= ts_within_enclosing_non_class
&& TYPE_HIDDEN_P (t
))
13704 /* This is no longer an invisible friend. Make it
13706 tree decl
= TYPE_NAME (t
);
13708 DECL_ANTICIPATED (decl
) = false;
13709 DECL_FRIEND_P (decl
) = false;
13711 if (TYPE_TEMPLATE_INFO (t
))
13713 tree tmpl
= TYPE_TI_TEMPLATE (t
);
13714 DECL_ANTICIPATED (tmpl
) = false;
13715 DECL_FRIEND_P (tmpl
) = false;
13723 /* Wrapper for xref_tag_1. */
13726 xref_tag (enum tag_types tag_code
, tree name
,
13727 tag_scope scope
, bool template_header_p
)
13731 subtime
= timevar_cond_start (TV_NAME_LOOKUP
);
13732 ret
= xref_tag_1 (tag_code
, name
, scope
, template_header_p
);
13733 timevar_cond_stop (TV_NAME_LOOKUP
, subtime
);
13739 xref_tag_from_type (tree old
, tree id
, tag_scope scope
)
13741 enum tag_types tag_kind
;
13743 if (TREE_CODE (old
) == RECORD_TYPE
)
13744 tag_kind
= (CLASSTYPE_DECLARED_CLASS (old
) ? class_type
: record_type
);
13746 tag_kind
= union_type
;
13748 if (id
== NULL_TREE
)
13749 id
= TYPE_IDENTIFIER (old
);
13751 return xref_tag (tag_kind
, id
, scope
, false);
13754 /* Create the binfo hierarchy for REF with (possibly NULL) base list
13755 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
13756 access_* node, and the TREE_VALUE is the type of the base-class.
13757 Non-NULL TREE_TYPE indicates virtual inheritance. */
13760 xref_basetypes (tree ref
, tree base_list
)
13763 tree binfo
, base_binfo
;
13764 unsigned max_vbases
= 0; /* Maximum direct & indirect virtual bases. */
13765 unsigned max_bases
= 0; /* Maximum direct bases. */
13766 unsigned max_dvbases
= 0; /* Maximum direct virtual bases. */
13768 tree default_access
;
13769 tree igo_prev
; /* Track Inheritance Graph Order. */
13771 if (ref
== error_mark_node
)
13774 /* The base of a derived class is private by default, all others are
13776 default_access
= (TREE_CODE (ref
) == RECORD_TYPE
13777 && CLASSTYPE_DECLARED_CLASS (ref
)
13778 ? access_private_node
: access_public_node
);
13780 /* First, make sure that any templates in base-classes are
13781 instantiated. This ensures that if we call ourselves recursively
13782 we do not get confused about which classes are marked and which
13784 basep
= &base_list
;
13787 tree basetype
= TREE_VALUE (*basep
);
13789 /* The dependent_type_p call below should really be dependent_scope_p
13790 so that we give a hard error about using an incomplete type as a
13791 base, but we allow it with a pedwarn for backward
13793 if (processing_template_decl
13794 && CLASS_TYPE_P (basetype
) && TYPE_BEING_DEFINED (basetype
))
13795 cxx_incomplete_type_diagnostic (NULL_TREE
, basetype
, DK_PEDWARN
);
13796 if (!dependent_type_p (basetype
)
13797 && !complete_type_or_else (basetype
, NULL
))
13798 /* An incomplete type. Remove it from the list. */
13799 *basep
= TREE_CHAIN (*basep
);
13803 if (TREE_TYPE (*basep
))
13805 if (CLASS_TYPE_P (basetype
))
13806 max_vbases
+= vec_safe_length (CLASSTYPE_VBASECLASSES (basetype
));
13807 basep
= &TREE_CHAIN (*basep
);
13810 max_vbases
+= max_dvbases
;
13812 TYPE_MARKED_P (ref
) = 1;
13814 /* The binfo slot should be empty, unless this is an (ill-formed)
13816 gcc_assert (!TYPE_BINFO (ref
) || TYPE_SIZE (ref
));
13818 gcc_assert (TYPE_MAIN_VARIANT (ref
) == ref
);
13820 binfo
= make_tree_binfo (max_bases
);
13822 TYPE_BINFO (ref
) = binfo
;
13823 BINFO_OFFSET (binfo
) = size_zero_node
;
13824 BINFO_TYPE (binfo
) = ref
;
13826 /* Apply base-class info set up to the variants of this type. */
13827 fixup_type_variants (ref
);
13831 vec_alloc (BINFO_BASE_ACCESSES (binfo
), max_bases
);
13832 /* A C++98 POD cannot have base classes. */
13833 CLASSTYPE_NON_LAYOUT_POD_P (ref
) = true;
13835 if (TREE_CODE (ref
) == UNION_TYPE
)
13837 error ("derived union %qT invalid", ref
);
13843 warning (OPT_Wmultiple_inheritance
,
13844 "%qT defined with multiple direct bases", ref
);
13848 /* An aggregate can't have virtual base classes. */
13849 CLASSTYPE_NON_AGGREGATE (ref
) = true;
13851 vec_alloc (CLASSTYPE_VBASECLASSES (ref
), max_vbases
);
13854 warning (OPT_Wvirtual_inheritance
,
13855 "%qT defined with direct virtual base", ref
);
13858 for (igo_prev
= binfo
; base_list
; base_list
= TREE_CHAIN (base_list
))
13860 tree access
= TREE_PURPOSE (base_list
);
13861 int via_virtual
= TREE_TYPE (base_list
) != NULL_TREE
;
13862 tree basetype
= TREE_VALUE (base_list
);
13864 if (access
== access_default_node
)
13865 access
= default_access
;
13867 /* Before C++17, an aggregate cannot have base classes. In C++17, an
13868 aggregate can't have virtual, private, or protected base classes. */
13869 if (cxx_dialect
< cxx17
13870 || access
!= access_public_node
13872 CLASSTYPE_NON_AGGREGATE (ref
) = true;
13874 if (PACK_EXPANSION_P (basetype
))
13875 basetype
= PACK_EXPANSION_PATTERN (basetype
);
13876 if (TREE_CODE (basetype
) == TYPE_DECL
)
13877 basetype
= TREE_TYPE (basetype
);
13878 if (!MAYBE_CLASS_TYPE_P (basetype
) || TREE_CODE (basetype
) == UNION_TYPE
)
13880 error ("base type %qT fails to be a struct or class type",
13885 base_binfo
= NULL_TREE
;
13886 if (CLASS_TYPE_P (basetype
) && !dependent_scope_p (basetype
))
13888 base_binfo
= TYPE_BINFO (basetype
);
13889 /* The original basetype could have been a typedef'd type. */
13890 basetype
= BINFO_TYPE (base_binfo
);
13892 /* Inherit flags from the base. */
13893 TYPE_HAS_NEW_OPERATOR (ref
)
13894 |= TYPE_HAS_NEW_OPERATOR (basetype
);
13895 TYPE_HAS_ARRAY_NEW_OPERATOR (ref
)
13896 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype
);
13897 TYPE_GETS_DELETE (ref
) |= TYPE_GETS_DELETE (basetype
);
13898 TYPE_HAS_CONVERSION (ref
) |= TYPE_HAS_CONVERSION (basetype
);
13899 CLASSTYPE_DIAMOND_SHAPED_P (ref
)
13900 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype
);
13901 CLASSTYPE_REPEATED_BASE_P (ref
)
13902 |= CLASSTYPE_REPEATED_BASE_P (basetype
);
13905 /* We must do this test after we've seen through a typedef
13907 if (TYPE_MARKED_P (basetype
))
13909 if (basetype
== ref
)
13910 error ("recursive type %qT undefined", basetype
);
13912 error ("duplicate base type %qT invalid", basetype
);
13916 if (PACK_EXPANSION_P (TREE_VALUE (base_list
)))
13917 /* Regenerate the pack expansion for the bases. */
13918 basetype
= make_pack_expansion (basetype
);
13920 TYPE_MARKED_P (basetype
) = 1;
13922 base_binfo
= copy_binfo (base_binfo
, basetype
, ref
,
13923 &igo_prev
, via_virtual
);
13924 if (!BINFO_INHERITANCE_CHAIN (base_binfo
))
13925 BINFO_INHERITANCE_CHAIN (base_binfo
) = binfo
;
13927 BINFO_BASE_APPEND (binfo
, base_binfo
);
13928 BINFO_BASE_ACCESS_APPEND (binfo
, access
);
13932 /* Update max_vbases to reflect the reality that we are dropping
13933 this base: if it reaches zero we want to undo the vec_alloc
13934 above to avoid inconsistencies during error-recovery: eg, in
13935 build_special_member_call, CLASSTYPE_VBASECLASSES non null
13936 and vtt null (c++/27952). */
13939 if (CLASS_TYPE_P (basetype
))
13941 -= vec_safe_length (CLASSTYPE_VBASECLASSES (basetype
));
13944 if (CLASSTYPE_VBASECLASSES (ref
)
13945 && max_vbases
== 0)
13946 vec_free (CLASSTYPE_VBASECLASSES (ref
));
13948 if (vec_safe_length (CLASSTYPE_VBASECLASSES (ref
)) < max_vbases
)
13949 /* If we didn't get max_vbases vbases, we must have shared at
13950 least one of them, and are therefore diamond shaped. */
13951 CLASSTYPE_DIAMOND_SHAPED_P (ref
) = 1;
13953 /* Unmark all the types. */
13954 for (i
= 0; BINFO_BASE_ITERATE (binfo
, i
, base_binfo
); i
++)
13955 TYPE_MARKED_P (BINFO_TYPE (base_binfo
)) = 0;
13956 TYPE_MARKED_P (ref
) = 0;
13958 /* Now see if we have a repeated base type. */
13959 if (!CLASSTYPE_REPEATED_BASE_P (ref
))
13961 for (base_binfo
= binfo
; base_binfo
;
13962 base_binfo
= TREE_CHAIN (base_binfo
))
13964 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo
)))
13966 CLASSTYPE_REPEATED_BASE_P (ref
) = 1;
13969 TYPE_MARKED_P (BINFO_TYPE (base_binfo
)) = 1;
13971 for (base_binfo
= binfo
; base_binfo
;
13972 base_binfo
= TREE_CHAIN (base_binfo
))
13973 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo
)))
13974 TYPE_MARKED_P (BINFO_TYPE (base_binfo
)) = 0;
13981 /* Copies the enum-related properties from type SRC to type DST.
13982 Used with the underlying type of an enum and the enum itself. */
13984 copy_type_enum (tree dst
, tree src
)
13987 for (t
= dst
; t
; t
= TYPE_NEXT_VARIANT (t
))
13989 TYPE_MIN_VALUE (t
) = TYPE_MIN_VALUE (src
);
13990 TYPE_MAX_VALUE (t
) = TYPE_MAX_VALUE (src
);
13991 TYPE_SIZE (t
) = TYPE_SIZE (src
);
13992 TYPE_SIZE_UNIT (t
) = TYPE_SIZE_UNIT (src
);
13993 SET_TYPE_MODE (dst
, TYPE_MODE (src
));
13994 TYPE_PRECISION (t
) = TYPE_PRECISION (src
);
13995 unsigned valign
= TYPE_ALIGN (src
);
13996 if (TYPE_USER_ALIGN (t
))
13997 valign
= MAX (valign
, TYPE_ALIGN (t
));
13999 TYPE_USER_ALIGN (t
) = TYPE_USER_ALIGN (src
);
14000 SET_TYPE_ALIGN (t
, valign
);
14001 TYPE_UNSIGNED (t
) = TYPE_UNSIGNED (src
);
14005 /* Begin compiling the definition of an enumeration type.
14008 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
14010 UNDERLYING_TYPE is the type that will be used as the storage for
14011 the enumeration type. This should be NULL_TREE if no storage type
14014 ATTRIBUTES are any attributes specified after the enum-key.
14016 SCOPED_ENUM_P is true if this is a scoped enumeration type.
14018 if IS_NEW is not NULL, gets TRUE iff a new type is created.
14020 Returns the type object, as yet incomplete.
14021 Also records info about it so that build_enumerator
14022 may be used to declare the individual values as they are read. */
14025 start_enum (tree name
, tree enumtype
, tree underlying_type
,
14026 tree attributes
, bool scoped_enum_p
, bool *is_new
)
14028 tree prevtype
= NULL_TREE
;
14029 gcc_assert (identifier_p (name
));
14033 /* [C++0x dcl.enum]p5:
14035 If not explicitly specified, the underlying type of a scoped
14036 enumeration type is int. */
14037 if (!underlying_type
&& scoped_enum_p
)
14038 underlying_type
= integer_type_node
;
14040 if (underlying_type
)
14041 underlying_type
= cv_unqualified (underlying_type
);
14043 /* If this is the real definition for a previous forward reference,
14044 fill in the contents in the same object that used to be the
14045 forward reference. */
14047 enumtype
= lookup_and_check_tag (enum_type
, name
,
14048 /*tag_scope=*/ts_current
,
14049 /*template_header_p=*/false);
14051 /* In case of a template_decl, the only check that should be deferred
14052 to instantiation time is the comparison of underlying types. */
14053 if (enumtype
&& TREE_CODE (enumtype
) == ENUMERAL_TYPE
)
14055 if (scoped_enum_p
!= SCOPED_ENUM_P (enumtype
))
14057 error_at (input_location
, "scoped/unscoped mismatch "
14058 "in enum %q#T", enumtype
);
14059 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype
)),
14060 "previous definition here");
14061 enumtype
= error_mark_node
;
14063 else if (ENUM_FIXED_UNDERLYING_TYPE_P (enumtype
) != !! underlying_type
)
14065 error_at (input_location
, "underlying type mismatch "
14066 "in enum %q#T", enumtype
);
14067 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype
)),
14068 "previous definition here");
14069 enumtype
= error_mark_node
;
14071 else if (underlying_type
&& ENUM_UNDERLYING_TYPE (enumtype
)
14072 && !dependent_type_p (underlying_type
)
14073 && !dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype
))
14074 && !same_type_p (underlying_type
,
14075 ENUM_UNDERLYING_TYPE (enumtype
)))
14077 error_at (input_location
, "different underlying type "
14078 "in enum %q#T", enumtype
);
14079 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype
)),
14080 "previous definition here");
14081 underlying_type
= NULL_TREE
;
14085 if (!enumtype
|| TREE_CODE (enumtype
) != ENUMERAL_TYPE
14086 || processing_template_decl
)
14088 /* In case of error, make a dummy enum to allow parsing to
14090 if (enumtype
== error_mark_node
)
14092 name
= make_anon_name ();
14093 enumtype
= NULL_TREE
;
14096 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
14097 of an opaque enum, or an opaque enum of an already defined
14098 enumeration (C++0x only).
14099 In any other case, it'll be NULL_TREE. */
14105 prevtype
= enumtype
;
14107 /* Do not push the decl more than once, unless we need to
14108 compare underlying types at instantiation time */
14110 || TREE_CODE (enumtype
) != ENUMERAL_TYPE
14111 || (underlying_type
14112 && dependent_type_p (underlying_type
))
14113 || (ENUM_UNDERLYING_TYPE (enumtype
)
14114 && dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype
))))
14116 enumtype
= cxx_make_type (ENUMERAL_TYPE
);
14117 enumtype
= pushtag (name
, enumtype
, /*tag_scope=*/ts_current
);
14119 /* std::byte aliases anything. */
14120 if (enumtype
!= error_mark_node
14121 && TYPE_CONTEXT (enumtype
) == std_node
14122 && !strcmp ("byte", TYPE_NAME_STRING (enumtype
)))
14123 TYPE_ALIAS_SET (enumtype
) = 0;
14126 enumtype
= xref_tag (enum_type
, name
, /*tag_scope=*/ts_current
,
14129 if (enumtype
== error_mark_node
)
14130 return error_mark_node
;
14132 /* The enum is considered opaque until the opening '{' of the
14133 enumerator list. */
14134 SET_OPAQUE_ENUM_P (enumtype
, true);
14135 ENUM_FIXED_UNDERLYING_TYPE_P (enumtype
) = !! underlying_type
;
14138 SET_SCOPED_ENUM_P (enumtype
, scoped_enum_p
);
14140 cplus_decl_attributes (&enumtype
, attributes
, (int)ATTR_FLAG_TYPE_IN_PLACE
);
14142 if (underlying_type
)
14144 if (ENUM_UNDERLYING_TYPE (enumtype
))
14145 /* We already checked that it matches, don't change it to a different
14146 typedef variant. */;
14147 else if (CP_INTEGRAL_TYPE_P (underlying_type
))
14149 copy_type_enum (enumtype
, underlying_type
);
14150 ENUM_UNDERLYING_TYPE (enumtype
) = underlying_type
;
14152 else if (dependent_type_p (underlying_type
))
14153 ENUM_UNDERLYING_TYPE (enumtype
) = underlying_type
;
14155 error ("underlying type %qT of %qT must be an integral type",
14156 underlying_type
, enumtype
);
14159 /* If into a template class, the returned enum is always the first
14160 declaration (opaque or not) seen. This way all the references to
14161 this type will be to the same declaration. The following ones are used
14162 only to check for definition errors. */
14163 if (prevtype
&& processing_template_decl
)
14169 /* After processing and defining all the values of an enumeration type,
14170 install their decls in the enumeration type.
14171 ENUMTYPE is the type object. */
14174 finish_enum_value_list (tree enumtype
)
14177 tree underlying_type
;
14180 tree minnode
, maxnode
;
14183 bool fixed_underlying_type_p
14184 = ENUM_UNDERLYING_TYPE (enumtype
) != NULL_TREE
;
14186 /* We built up the VALUES in reverse order. */
14187 TYPE_VALUES (enumtype
) = nreverse (TYPE_VALUES (enumtype
));
14189 /* For an enum defined in a template, just set the type of the values;
14190 all further processing is postponed until the template is
14191 instantiated. We need to set the type so that tsubst of a CONST_DECL
14193 if (processing_template_decl
)
14195 for (values
= TYPE_VALUES (enumtype
);
14197 values
= TREE_CHAIN (values
))
14198 TREE_TYPE (TREE_VALUE (values
)) = enumtype
;
14202 /* Determine the minimum and maximum values of the enumerators. */
14203 if (TYPE_VALUES (enumtype
))
14205 minnode
= maxnode
= NULL_TREE
;
14207 for (values
= TYPE_VALUES (enumtype
);
14209 values
= TREE_CHAIN (values
))
14211 decl
= TREE_VALUE (values
);
14213 /* [dcl.enum]: Following the closing brace of an enum-specifier,
14214 each enumerator has the type of its enumeration. Prior to the
14215 closing brace, the type of each enumerator is the type of its
14216 initializing value. */
14217 TREE_TYPE (decl
) = enumtype
;
14219 /* Update the minimum and maximum values, if appropriate. */
14220 value
= DECL_INITIAL (decl
);
14221 if (value
== error_mark_node
)
14222 value
= integer_zero_node
;
14223 /* Figure out what the minimum and maximum values of the
14224 enumerators are. */
14226 minnode
= maxnode
= value
;
14227 else if (tree_int_cst_lt (maxnode
, value
))
14229 else if (tree_int_cst_lt (value
, minnode
))
14236 If the enumerator-list is empty, the underlying type is as if
14237 the enumeration had a single enumerator with value 0. */
14238 minnode
= maxnode
= integer_zero_node
;
14240 if (!fixed_underlying_type_p
)
14242 /* Compute the number of bits require to represent all values of the
14243 enumeration. We must do this before the type of MINNODE and
14244 MAXNODE are transformed, since tree_int_cst_min_precision relies
14245 on the TREE_TYPE of the value it is passed. */
14246 signop sgn
= tree_int_cst_sgn (minnode
) >= 0 ? UNSIGNED
: SIGNED
;
14247 int lowprec
= tree_int_cst_min_precision (minnode
, sgn
);
14248 int highprec
= tree_int_cst_min_precision (maxnode
, sgn
);
14249 int precision
= MAX (lowprec
, highprec
);
14251 bool use_short_enum
;
14253 /* Determine the underlying type of the enumeration.
14257 The underlying type of an enumeration is an integral type that
14258 can represent all the enumerator values defined in the
14259 enumeration. It is implementation-defined which integral type is
14260 used as the underlying type for an enumeration except that the
14261 underlying type shall not be larger than int unless the value of
14262 an enumerator cannot fit in an int or unsigned int.
14264 We use "int" or an "unsigned int" as the underlying type, even if
14265 a smaller integral type would work, unless the user has
14266 explicitly requested that we use the smallest possible type. The
14267 user can request that for all enumerations with a command line
14268 flag, or for just one enumeration with an attribute. */
14270 use_short_enum
= flag_short_enums
14271 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype
));
14273 /* If the precision of the type was specified with an attribute and it
14274 was too small, give an error. Otherwise, use it. */
14275 if (TYPE_PRECISION (enumtype
))
14277 if (precision
> TYPE_PRECISION (enumtype
))
14278 error ("specified mode too small for enumeral values");
14281 use_short_enum
= true;
14282 precision
= TYPE_PRECISION (enumtype
);
14286 for (itk
= (use_short_enum
? itk_char
: itk_int
);
14290 underlying_type
= integer_types
[itk
];
14291 if (underlying_type
!= NULL_TREE
14292 && TYPE_PRECISION (underlying_type
) >= precision
14293 && TYPE_SIGN (underlying_type
) == sgn
)
14296 if (itk
== itk_none
)
14300 IF no integral type can represent all the enumerator values, the
14301 enumeration is ill-formed. */
14302 error ("no integral type can represent all of the enumerator values "
14303 "for %qT", enumtype
);
14304 precision
= TYPE_PRECISION (long_long_integer_type_node
);
14305 underlying_type
= integer_types
[itk_unsigned_long_long
];
14310 The value of sizeof() applied to an enumeration type, an object
14311 of an enumeration type, or an enumerator, is the value of sizeof()
14312 applied to the underlying type. */
14313 copy_type_enum (enumtype
, underlying_type
);
14315 /* Compute the minimum and maximum values for the type.
14319 For an enumeration where emin is the smallest enumerator and emax
14320 is the largest, the values of the enumeration are the values of the
14321 underlying type in the range bmin to bmax, where bmin and bmax are,
14322 respectively, the smallest and largest values of the smallest bit-
14323 field that can store emin and emax. */
14325 /* The middle-end currently assumes that types with TYPE_PRECISION
14326 narrower than their underlying type are suitably zero or sign
14327 extended to fill their mode. Similarly, it assumes that the front
14328 end assures that a value of a particular type must be within
14329 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
14331 We used to set these fields based on bmin and bmax, but that led
14332 to invalid assumptions like optimizing away bounds checking. So
14333 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
14334 TYPE_MAX_VALUE to the values for the mode above and only restrict
14335 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
14336 ENUM_UNDERLYING_TYPE (enumtype
)
14337 = build_distinct_type_copy (underlying_type
);
14338 TYPE_PRECISION (ENUM_UNDERLYING_TYPE (enumtype
)) = precision
;
14339 set_min_and_max_values_for_integral_type
14340 (ENUM_UNDERLYING_TYPE (enumtype
), precision
, sgn
);
14342 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
14343 if (flag_strict_enums
)
14344 set_min_and_max_values_for_integral_type (enumtype
, precision
, sgn
);
14347 underlying_type
= ENUM_UNDERLYING_TYPE (enumtype
);
14349 /* Convert each of the enumerators to the type of the underlying
14350 type of the enumeration. */
14351 for (values
= TYPE_VALUES (enumtype
); values
; values
= TREE_CHAIN (values
))
14353 location_t saved_location
;
14355 decl
= TREE_VALUE (values
);
14356 saved_location
= input_location
;
14357 input_location
= DECL_SOURCE_LOCATION (decl
);
14358 if (fixed_underlying_type_p
)
14359 /* If the enumeration type has a fixed underlying type, we
14360 already checked all of the enumerator values. */
14361 value
= DECL_INITIAL (decl
);
14363 value
= perform_implicit_conversion (underlying_type
,
14364 DECL_INITIAL (decl
),
14365 tf_warning_or_error
);
14366 input_location
= saved_location
;
14368 /* Do not clobber shared ints. */
14369 if (value
!= error_mark_node
)
14371 value
= copy_node (value
);
14373 TREE_TYPE (value
) = enumtype
;
14375 DECL_INITIAL (decl
) = value
;
14378 /* Fix up all variant types of this enum type. */
14379 for (t
= TYPE_MAIN_VARIANT (enumtype
); t
; t
= TYPE_NEXT_VARIANT (t
))
14380 TYPE_VALUES (t
) = TYPE_VALUES (enumtype
);
14382 if (at_class_scope_p ()
14383 && COMPLETE_TYPE_P (current_class_type
)
14384 && UNSCOPED_ENUM_P (enumtype
))
14386 insert_late_enum_def_bindings (current_class_type
, enumtype
);
14387 /* TYPE_FIELDS needs fixup. */
14388 fixup_type_variants (current_class_type
);
14391 /* Finish debugging output for this type. */
14392 rest_of_type_compilation (enumtype
, namespace_bindings_p ());
14394 /* Each enumerator now has the type of its enumeration. Clear the cache
14395 so that this change in types doesn't confuse us later on. */
14396 clear_cv_and_fold_caches ();
14399 /* Finishes the enum type. This is called only the first time an
14400 enumeration is seen, be it opaque or odinary.
14401 ENUMTYPE is the type object. */
14404 finish_enum (tree enumtype
)
14406 if (processing_template_decl
)
14408 if (at_function_scope_p ())
14409 add_stmt (build_min (TAG_DEFN
, enumtype
));
14413 /* If this is a forward declaration, there should not be any variants,
14414 though we can get a variant in the middle of an enum-specifier with
14415 wacky code like 'enum E { e = sizeof(const E*) };' */
14416 gcc_assert (enumtype
== TYPE_MAIN_VARIANT (enumtype
)
14417 && (TYPE_VALUES (enumtype
)
14418 || !TYPE_NEXT_VARIANT (enumtype
)));
14421 /* Build and install a CONST_DECL for an enumeration constant of the
14422 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
14423 Apply ATTRIBUTES if available. LOC is the location of NAME.
14424 Assignment of sequential values by default is handled here. */
14427 build_enumerator (tree name
, tree value
, tree enumtype
, tree attributes
,
14434 /* scalar_constant_value will pull out this expression, so make sure
14435 it's folded as appropriate. */
14436 if (processing_template_decl
)
14437 value
= fold_non_dependent_expr (value
);
14439 /* If the VALUE was erroneous, pretend it wasn't there; that will
14440 result in the enum being assigned the next value in sequence. */
14441 if (value
== error_mark_node
)
14444 /* Remove no-op casts from the value. */
14446 STRIP_TYPE_NOPS (value
);
14448 if (! processing_template_decl
)
14450 /* Validate and default VALUE. */
14451 if (value
!= NULL_TREE
)
14453 if (!ENUM_UNDERLYING_TYPE (enumtype
))
14455 tree tmp_value
= build_expr_type_conversion (WANT_INT
| WANT_ENUM
,
14460 else if (! INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P
14461 (TREE_TYPE (value
)))
14462 value
= perform_implicit_conversion_flags
14463 (ENUM_UNDERLYING_TYPE (enumtype
), value
, tf_warning_or_error
,
14464 LOOKUP_IMPLICIT
| LOOKUP_NO_NARROWING
);
14466 if (value
== error_mark_node
)
14469 if (value
!= NULL_TREE
)
14471 if (! INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P
14472 (TREE_TYPE (value
)))
14474 error ("enumerator value for %qD must have integral or "
14475 "unscoped enumeration type", name
);
14480 value
= cxx_constant_value (value
);
14482 if (TREE_CODE (value
) != INTEGER_CST
)
14484 error ("enumerator value for %qD is not an integer "
14492 /* Default based on previous value. */
14493 if (value
== NULL_TREE
)
14495 if (TYPE_VALUES (enumtype
))
14500 /* C++03 7.2/4: If no initializer is specified for the first
14501 enumerator, the type is an unspecified integral
14502 type. Otherwise the type is the same as the type of the
14503 initializing value of the preceding enumerator unless the
14504 incremented value is not representable in that type, in
14505 which case the type is an unspecified integral type
14506 sufficient to contain the incremented value. */
14507 prev_value
= DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype
)));
14508 if (error_operand_p (prev_value
))
14509 value
= error_mark_node
;
14512 tree type
= TREE_TYPE (prev_value
);
14513 signop sgn
= TYPE_SIGN (type
);
14514 widest_int wi
= wi::add (wi::to_widest (prev_value
), 1, sgn
,
14518 bool pos
= !wi::neg_p (wi
, sgn
);
14519 if (!wi::fits_to_tree_p (wi
, type
))
14522 for (itk
= itk_int
; itk
!= itk_none
; itk
++)
14524 type
= integer_types
[itk
];
14525 if (type
!= NULL_TREE
14526 && (pos
|| !TYPE_UNSIGNED (type
))
14527 && wi::fits_to_tree_p (wi
, type
))
14530 if (type
&& cxx_dialect
< cxx11
14531 && itk
> itk_unsigned_long
)
14532 pedwarn (input_location
, OPT_Wlong_long
,
14534 incremented enumerator value is too large for %<unsigned long%>") : G_("\
14535 incremented enumerator value is too large for %<long%>"));
14537 if (type
== NULL_TREE
)
14540 value
= wide_int_to_tree (type
, wi
);
14545 error ("overflow in enumeration values at %qD", name
);
14546 value
= error_mark_node
;
14551 value
= integer_zero_node
;
14554 /* Remove no-op casts from the value. */
14555 STRIP_TYPE_NOPS (value
);
14557 /* If the underlying type of the enum is fixed, check whether
14558 the enumerator values fits in the underlying type. If it
14559 does not fit, the program is ill-formed [C++0x dcl.enum]. */
14560 if (ENUM_UNDERLYING_TYPE (enumtype
)
14562 && TREE_CODE (value
) == INTEGER_CST
)
14564 if (!int_fits_type_p (value
, ENUM_UNDERLYING_TYPE (enumtype
)))
14565 error ("enumerator value %qE is outside the range of underlying "
14566 "type %qT", value
, ENUM_UNDERLYING_TYPE (enumtype
));
14568 /* Convert the value to the appropriate type. */
14569 value
= fold_convert (ENUM_UNDERLYING_TYPE (enumtype
), value
);
14573 /* C++ associates enums with global, function, or class declarations. */
14574 context
= current_scope ();
14576 /* Build the actual enumeration constant. Note that the enumeration
14577 constants have the underlying type of the enum (if it is fixed)
14578 or the type of their initializer (if the underlying type of the
14579 enum is not fixed):
14583 If the underlying type is fixed, the type of each enumerator
14584 prior to the closing brace is the underlying type; if the
14585 initializing value of an enumerator cannot be represented by
14586 the underlying type, the program is ill-formed. If the
14587 underlying type is not fixed, the type of each enumerator is
14588 the type of its initializing value.
14590 If the underlying type is not fixed, it will be computed by
14591 finish_enum and we will reset the type of this enumerator. Of
14592 course, if we're processing a template, there may be no value. */
14593 type
= value
? TREE_TYPE (value
) : NULL_TREE
;
14595 decl
= build_decl (loc
, CONST_DECL
, name
, type
);
14597 DECL_CONTEXT (decl
) = enumtype
;
14598 TREE_CONSTANT (decl
) = 1;
14599 TREE_READONLY (decl
) = 1;
14600 DECL_INITIAL (decl
) = value
;
14603 cplus_decl_attributes (&decl
, attributes
, 0);
14605 if (context
&& context
== current_class_type
&& !SCOPED_ENUM_P (enumtype
))
14607 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
14608 on the TYPE_FIELDS list for `S'. (That's so that you can say
14609 things like `S::i' later.) */
14611 /* The enumerator may be getting declared outside of its enclosing
14614 class S { public: enum E : int; }; enum S::E : int { i = 7; };
14616 For which case we need to make sure that the access of `S::i'
14617 matches the access of `S::E'. */
14618 tree saved_cas
= current_access_specifier
;
14619 if (TREE_PRIVATE (TYPE_NAME (enumtype
)))
14620 current_access_specifier
= access_private_node
;
14621 else if (TREE_PROTECTED (TYPE_NAME (enumtype
)))
14622 current_access_specifier
= access_protected_node
;
14624 current_access_specifier
= access_public_node
;
14626 finish_member_declaration (decl
);
14628 current_access_specifier
= saved_cas
;
14633 /* Add this enumeration constant to the list for this type. */
14634 TYPE_VALUES (enumtype
) = tree_cons (name
, decl
, TYPE_VALUES (enumtype
));
14637 /* Look for an enumerator with the given NAME within the enumeration
14638 type ENUMTYPE. This routine is used primarily for qualified name
14639 lookup into an enumerator in C++0x, e.g.,
14641 enum class Color { Red, Green, Blue };
14643 Color color = Color::Red;
14645 Returns the value corresponding to the enumerator, or
14646 NULL_TREE if no such enumerator was found. */
14648 lookup_enumerator (tree enumtype
, tree name
)
14651 gcc_assert (enumtype
&& TREE_CODE (enumtype
) == ENUMERAL_TYPE
);
14653 e
= purpose_member (name
, TYPE_VALUES (enumtype
));
14654 return e
? TREE_VALUE (e
) : NULL_TREE
;
14658 /* We're defining DECL. Make sure that its type is OK. */
14661 check_function_type (tree decl
, tree current_function_parms
)
14663 tree fntype
= TREE_TYPE (decl
);
14664 tree return_type
= complete_type (TREE_TYPE (fntype
));
14666 /* In a function definition, arg types must be complete. */
14667 require_complete_types_for_parms (current_function_parms
);
14669 if (dependent_type_p (return_type
)
14670 || type_uses_auto (return_type
))
14672 if (!COMPLETE_OR_VOID_TYPE_P (return_type
))
14674 tree args
= TYPE_ARG_TYPES (fntype
);
14676 error ("return type %q#T is incomplete", return_type
);
14678 /* Make it return void instead. */
14679 if (TREE_CODE (fntype
) == METHOD_TYPE
)
14680 fntype
= build_method_type_directly (TREE_TYPE (TREE_VALUE (args
)),
14682 TREE_CHAIN (args
));
14684 fntype
= build_function_type (void_type_node
, args
);
14686 = build_exception_variant (fntype
,
14687 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl
)));
14688 fntype
= (cp_build_type_attribute_variant
14689 (fntype
, TYPE_ATTRIBUTES (TREE_TYPE (decl
))));
14690 TREE_TYPE (decl
) = fntype
;
14694 abstract_virtuals_error (decl
, TREE_TYPE (fntype
));
14695 maybe_warn_parm_abi (TREE_TYPE (fntype
),
14696 DECL_SOURCE_LOCATION (decl
));
14700 /* True iff FN is an implicitly-defined default constructor. */
14703 implicit_default_ctor_p (tree fn
)
14705 return (DECL_CONSTRUCTOR_P (fn
)
14706 && !user_provided_p (fn
)
14707 && sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (fn
)));
14710 /* Clobber the contents of *this to let the back end know that the object
14711 storage is dead when we enter the constructor or leave the destructor. */
14714 build_clobber_this ()
14716 /* Clobbering an empty base is pointless, and harmful if its one byte
14717 TYPE_SIZE overlays real data. */
14718 if (is_empty_class (current_class_type
))
14721 /* If we have virtual bases, clobber the whole object, but only if we're in
14722 charge. If we don't have virtual bases, clobber the as-base type so we
14723 don't mess with tail padding. */
14724 bool vbases
= CLASSTYPE_VBASECLASSES (current_class_type
);
14726 tree ctype
= current_class_type
;
14728 ctype
= CLASSTYPE_AS_BASE (ctype
);
14730 tree clobber
= build_constructor (ctype
, NULL
);
14731 TREE_THIS_VOLATILE (clobber
) = true;
14733 tree thisref
= current_class_ref
;
14734 if (ctype
!= current_class_type
)
14736 thisref
= build_nop (build_reference_type (ctype
), current_class_ptr
);
14737 thisref
= convert_from_reference (thisref
);
14740 tree exprstmt
= build2 (MODIFY_EXPR
, void_type_node
, thisref
, clobber
);
14742 exprstmt
= build_if_in_charge (exprstmt
);
14747 /* Create the FUNCTION_DECL for a function definition.
14748 DECLSPECS and DECLARATOR are the parts of the declaration;
14749 they describe the function's name and the type it returns,
14750 but twisted together in a fashion that parallels the syntax of C.
14752 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
14753 DECLARATOR is really the DECL for the function we are about to
14754 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
14755 indicating that the function is an inline defined in-class.
14757 This function creates a binding context for the function body
14758 as well as setting up the FUNCTION_DECL in current_function_decl.
14760 For C++, we must first check whether that datum makes any sense.
14761 For example, "class A local_a(1,2);" means that variable local_a
14762 is an aggregate of type A, which should have a constructor
14763 applied to it with the argument list [1, 2].
14765 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
14766 or may be a BLOCK if the function has been defined previously
14767 in this translation unit. On exit, DECL_INITIAL (decl1) will be
14768 error_mark_node if the function has never been defined, or
14769 a BLOCK if the function has been defined somewhere. */
14772 start_preparsed_function (tree decl1
, tree attrs
, int flags
)
14774 tree ctype
= NULL_TREE
;
14777 int doing_friend
= 0;
14778 cp_binding_level
*bl
;
14779 tree current_function_parms
;
14780 struct c_fileinfo
*finfo
14781 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1
)));
14782 bool honor_interface
;
14784 /* Sanity check. */
14785 gcc_assert (VOID_TYPE_P (TREE_VALUE (void_list_node
)));
14786 gcc_assert (TREE_CHAIN (void_list_node
) == NULL_TREE
);
14788 fntype
= TREE_TYPE (decl1
);
14789 if (TREE_CODE (fntype
) == METHOD_TYPE
)
14790 ctype
= TYPE_METHOD_BASETYPE (fntype
);
14792 /* ISO C++ 11.4/5. A friend function defined in a class is in
14793 the (lexical) scope of the class in which it is defined. */
14794 if (!ctype
&& DECL_FRIEND_P (decl1
))
14796 ctype
= DECL_FRIEND_CONTEXT (decl1
);
14798 /* CTYPE could be null here if we're dealing with a template;
14799 for example, `inline friend float foo()' inside a template
14800 will have no CTYPE set. */
14801 if (ctype
&& TREE_CODE (ctype
) != RECORD_TYPE
)
14807 if (DECL_DECLARED_INLINE_P (decl1
)
14808 && lookup_attribute ("noinline", attrs
))
14809 warning_at (DECL_SOURCE_LOCATION (decl1
), 0,
14810 "inline function %qD given attribute noinline", decl1
);
14812 /* Handle gnu_inline attribute. */
14813 if (GNU_INLINE_P (decl1
))
14815 DECL_EXTERNAL (decl1
) = 1;
14816 DECL_NOT_REALLY_EXTERN (decl1
) = 0;
14817 DECL_INTERFACE_KNOWN (decl1
) = 1;
14818 DECL_DISREGARD_INLINE_LIMITS (decl1
) = 1;
14821 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1
))
14822 /* This is a constructor, we must ensure that any default args
14823 introduced by this definition are propagated to the clones
14824 now. The clones are used directly in overload resolution. */
14825 adjust_clone_args (decl1
);
14827 /* Sometimes we don't notice that a function is a static member, and
14828 build a METHOD_TYPE for it. Fix that up now. */
14829 gcc_assert (!(ctype
!= NULL_TREE
&& DECL_STATIC_FUNCTION_P (decl1
)
14830 && TREE_CODE (TREE_TYPE (decl1
)) == METHOD_TYPE
));
14832 /* Set up current_class_type, and enter the scope of the class, if
14835 push_nested_class (ctype
);
14836 else if (DECL_STATIC_FUNCTION_P (decl1
))
14837 push_nested_class (DECL_CONTEXT (decl1
));
14839 /* Now that we have entered the scope of the class, we must restore
14840 the bindings for any template parameters surrounding DECL1, if it
14841 is an inline member template. (Order is important; consider the
14842 case where a template parameter has the same name as a field of
14843 the class.) It is not until after this point that
14844 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
14845 if (flags
& SF_INCLASS_INLINE
)
14846 maybe_begin_member_template_processing (decl1
);
14848 /* Effective C++ rule 15. */
14850 && DECL_ASSIGNMENT_OPERATOR_P (decl1
)
14851 && DECL_OVERLOADED_OPERATOR_IS (decl1
, NOP_EXPR
)
14852 && VOID_TYPE_P (TREE_TYPE (fntype
)))
14853 warning (OPT_Weffc__
,
14854 "%<operator=%> should return a reference to %<*this%>");
14856 /* Make the init_value nonzero so pushdecl knows this is not tentative.
14857 error_mark_node is replaced below (in poplevel) with the BLOCK. */
14858 if (!DECL_INITIAL (decl1
))
14859 DECL_INITIAL (decl1
) = error_mark_node
;
14861 /* This function exists in static storage.
14862 (This does not mean `static' in the C sense!) */
14863 TREE_STATIC (decl1
) = 1;
14865 /* We must call push_template_decl after current_class_type is set
14866 up. (If we are processing inline definitions after exiting a
14867 class scope, current_class_type will be NULL_TREE until set above
14868 by push_nested_class.) */
14869 if (processing_template_decl
)
14871 tree newdecl1
= push_template_decl (decl1
);
14872 if (newdecl1
== error_mark_node
)
14874 if (ctype
|| DECL_STATIC_FUNCTION_P (decl1
))
14875 pop_nested_class ();
14881 /* Make sure the parameter and return types are reasonable. When
14882 you declare a function, these types can be incomplete, but they
14883 must be complete when you define the function. */
14884 check_function_type (decl1
, DECL_ARGUMENTS (decl1
));
14886 /* Build the return declaration for the function. */
14887 restype
= TREE_TYPE (fntype
);
14889 if (DECL_RESULT (decl1
) == NULL_TREE
)
14893 resdecl
= build_decl (input_location
, RESULT_DECL
, 0, restype
);
14894 DECL_ARTIFICIAL (resdecl
) = 1;
14895 DECL_IGNORED_P (resdecl
) = 1;
14896 DECL_RESULT (decl1
) = resdecl
;
14898 cp_apply_type_quals_to_decl (cp_type_quals (restype
), resdecl
);
14901 /* Record the decl so that the function name is defined.
14902 If we already have a decl for this name, and it is a FUNCTION_DECL,
14903 use the old decl. */
14904 if (!processing_template_decl
&& !(flags
& SF_PRE_PARSED
))
14906 /* A specialization is not used to guide overload resolution. */
14907 if (!DECL_FUNCTION_MEMBER_P (decl1
)
14908 && !(DECL_USE_TEMPLATE (decl1
) &&
14909 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1
))))
14911 tree olddecl
= pushdecl (decl1
);
14913 if (olddecl
== error_mark_node
)
14914 /* If something went wrong when registering the declaration,
14915 use DECL1; we have to have a FUNCTION_DECL to use when
14916 parsing the body of the function. */
14920 /* Otherwise, OLDDECL is either a previous declaration
14921 of the same function or DECL1 itself. */
14923 if (warn_missing_declarations
14924 && olddecl
== decl1
14925 && !DECL_MAIN_P (decl1
)
14926 && TREE_PUBLIC (decl1
)
14927 && !DECL_DECLARED_INLINE_P (decl1
))
14931 /* Check whether DECL1 is in an anonymous
14933 for (context
= DECL_CONTEXT (decl1
);
14935 context
= DECL_CONTEXT (context
))
14937 if (TREE_CODE (context
) == NAMESPACE_DECL
14938 && DECL_NAME (context
) == NULL_TREE
)
14942 if (context
== NULL
)
14943 warning_at (DECL_SOURCE_LOCATION (decl1
),
14944 OPT_Wmissing_declarations
,
14945 "no previous declaration for %qD", decl1
);
14953 /* We need to set the DECL_CONTEXT. */
14954 if (!DECL_CONTEXT (decl1
) && DECL_TEMPLATE_INFO (decl1
))
14955 DECL_CONTEXT (decl1
) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1
));
14957 fntype
= TREE_TYPE (decl1
);
14958 restype
= TREE_TYPE (fntype
);
14960 /* If #pragma weak applies, mark the decl appropriately now.
14961 The pragma only applies to global functions. Because
14962 determining whether or not the #pragma applies involves
14963 computing the mangled name for the declaration, we cannot
14964 apply the pragma until after we have merged this declaration
14965 with any previous declarations; if the original declaration
14966 has a linkage specification, that specification applies to
14967 the definition as well, and may affect the mangled name. */
14968 if (DECL_FILE_SCOPE_P (decl1
))
14969 maybe_apply_pragma_weak (decl1
);
14972 /* We are now in the scope of the function being defined. */
14973 current_function_decl
= decl1
;
14975 /* Save the parm names or decls from this function's declarator
14976 where store_parm_decls will find them. */
14977 current_function_parms
= DECL_ARGUMENTS (decl1
);
14979 /* Let the user know we're compiling this function. */
14980 announce_function (decl1
);
14982 gcc_assert (DECL_INITIAL (decl1
));
14984 /* This function may already have been parsed, in which case just
14985 return; our caller will skip over the body without parsing. */
14986 if (DECL_INITIAL (decl1
) != error_mark_node
)
14989 /* Initialize RTL machinery. We cannot do this until
14990 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
14991 even when processing a template; this is how we get
14992 CFUN set up, and our per-function variables initialized.
14993 FIXME factor out the non-RTL stuff. */
14994 bl
= current_binding_level
;
14995 allocate_struct_function (decl1
, processing_template_decl
);
14997 /* Initialize the language data structures. Whenever we start
14998 a new function, we destroy temporaries in the usual way. */
14999 cfun
->language
= ggc_cleared_alloc
<language_function
> ();
15000 current_stmt_tree ()->stmts_are_full_exprs_p
= 1;
15001 current_binding_level
= bl
;
15003 if (!processing_template_decl
&& type_uses_auto (restype
))
15005 FNDECL_USED_AUTO (decl1
) = true;
15006 current_function_auto_return_pattern
= restype
;
15009 /* Start the statement-tree, start the tree now. */
15010 DECL_SAVED_TREE (decl1
) = push_stmt_list ();
15012 /* If we are (erroneously) defining a function that we have already
15013 defined before, wipe out what we knew before. */
15014 if (!DECL_PENDING_INLINE_P (decl1
))
15015 DECL_SAVED_FUNCTION_DATA (decl1
) = NULL
;
15017 if (ctype
&& !doing_friend
&& !DECL_STATIC_FUNCTION_P (decl1
))
15019 /* We know that this was set up by `grokclassfn'. We do not
15020 wait until `store_parm_decls', since evil parse errors may
15021 never get us to that point. Here we keep the consistency
15022 between `current_class_type' and `current_class_ptr'. */
15023 tree t
= DECL_ARGUMENTS (decl1
);
15025 gcc_assert (t
!= NULL_TREE
&& TREE_CODE (t
) == PARM_DECL
);
15026 gcc_assert (TYPE_PTR_P (TREE_TYPE (t
)));
15028 cp_function_chain
->x_current_class_ref
15029 = cp_build_fold_indirect_ref (t
);
15030 /* Set this second to avoid shortcut in cp_build_indirect_ref. */
15031 cp_function_chain
->x_current_class_ptr
= t
;
15033 /* Constructors and destructors need to know whether they're "in
15034 charge" of initializing virtual base classes. */
15035 t
= DECL_CHAIN (t
);
15036 if (DECL_HAS_IN_CHARGE_PARM_P (decl1
))
15038 current_in_charge_parm
= t
;
15039 t
= DECL_CHAIN (t
);
15041 if (DECL_HAS_VTT_PARM_P (decl1
))
15043 gcc_assert (DECL_NAME (t
) == vtt_parm_identifier
);
15044 current_vtt_parm
= t
;
15048 honor_interface
= (!DECL_TEMPLATE_INSTANTIATION (decl1
)
15049 /* Implicitly-defined methods (like the
15050 destructor for a class in which no destructor
15051 is explicitly declared) must not be defined
15052 until their definition is needed. So, we
15053 ignore interface specifications for
15054 compiler-generated functions. */
15055 && !DECL_ARTIFICIAL (decl1
));
15057 if (processing_template_decl
)
15058 /* Don't mess with interface flags. */;
15059 else if (DECL_INTERFACE_KNOWN (decl1
))
15061 tree ctx
= decl_function_context (decl1
);
15063 if (DECL_NOT_REALLY_EXTERN (decl1
))
15064 DECL_EXTERNAL (decl1
) = 0;
15066 if (ctx
!= NULL_TREE
&& vague_linkage_p (ctx
))
15067 /* This is a function in a local class in an extern inline
15068 or template function. */
15069 comdat_linkage (decl1
);
15071 /* If this function belongs to an interface, it is public.
15072 If it belongs to someone else's interface, it is also external.
15073 This only affects inlines and template instantiations. */
15074 else if (!finfo
->interface_unknown
&& honor_interface
)
15076 if (DECL_DECLARED_INLINE_P (decl1
)
15077 || DECL_TEMPLATE_INSTANTIATION (decl1
))
15079 DECL_EXTERNAL (decl1
)
15080 = (finfo
->interface_only
15081 || (DECL_DECLARED_INLINE_P (decl1
)
15082 && ! flag_implement_inlines
15083 && !DECL_VINDEX (decl1
)));
15085 /* For WIN32 we also want to put these in linkonce sections. */
15086 maybe_make_one_only (decl1
);
15089 DECL_EXTERNAL (decl1
) = 0;
15090 DECL_INTERFACE_KNOWN (decl1
) = 1;
15091 /* If this function is in an interface implemented in this file,
15092 make sure that the back end knows to emit this function
15094 if (!DECL_EXTERNAL (decl1
))
15095 mark_needed (decl1
);
15097 else if (finfo
->interface_unknown
&& finfo
->interface_only
15098 && honor_interface
)
15100 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
15101 interface, we will have both finfo->interface_unknown and
15102 finfo->interface_only set. In that case, we don't want to
15103 use the normal heuristics because someone will supply a
15104 #pragma implementation elsewhere, and deducing it here would
15105 produce a conflict. */
15106 comdat_linkage (decl1
);
15107 DECL_EXTERNAL (decl1
) = 0;
15108 DECL_INTERFACE_KNOWN (decl1
) = 1;
15109 DECL_DEFER_OUTPUT (decl1
) = 1;
15113 /* This is a definition, not a reference.
15114 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
15115 if (!GNU_INLINE_P (decl1
))
15116 DECL_EXTERNAL (decl1
) = 0;
15118 if ((DECL_DECLARED_INLINE_P (decl1
)
15119 || DECL_TEMPLATE_INSTANTIATION (decl1
))
15120 && ! DECL_INTERFACE_KNOWN (decl1
))
15121 DECL_DEFER_OUTPUT (decl1
) = 1;
15123 DECL_INTERFACE_KNOWN (decl1
) = 1;
15126 /* Determine the ELF visibility attribute for the function. We must not
15127 do this before calling "pushdecl", as we must allow "duplicate_decls"
15128 to merge any attributes appropriately. We also need to wait until
15130 if (!DECL_CLONED_FUNCTION_P (decl1
))
15131 determine_visibility (decl1
);
15133 if (!processing_template_decl
)
15134 maybe_instantiate_noexcept (decl1
);
15136 begin_scope (sk_function_parms
, decl1
);
15140 if (DECL_DESTRUCTOR_P (decl1
)
15141 || (DECL_CONSTRUCTOR_P (decl1
)
15142 && targetm
.cxx
.cdtor_returns_this ()))
15144 cdtor_label
= create_artificial_label (input_location
);
15145 LABEL_DECL_CDTOR (cdtor_label
) = true;
15148 start_fname_decls ();
15150 store_parm_decls (current_function_parms
);
15152 if (!processing_template_decl
15153 && (flag_lifetime_dse
> 1)
15154 && DECL_CONSTRUCTOR_P (decl1
)
15155 && !DECL_CLONED_FUNCTION_P (decl1
)
15156 /* Clobbering an empty base is harmful if it overlays real data. */
15157 && !is_empty_class (current_class_type
)
15158 /* We can't clobber safely for an implicitly-defined default constructor
15159 because part of the initialization might happen before we enter the
15160 constructor, via AGGR_INIT_ZERO_FIRST (c++/68006). */
15161 && !implicit_default_ctor_p (decl1
))
15162 finish_expr_stmt (build_clobber_this ());
15164 if (!processing_template_decl
15165 && DECL_CONSTRUCTOR_P (decl1
)
15166 && sanitize_flags_p (SANITIZE_VPTR
)
15167 && !DECL_CLONED_FUNCTION_P (decl1
)
15168 && !implicit_default_ctor_p (decl1
))
15169 cp_ubsan_maybe_initialize_vtbl_ptrs (current_class_ptr
);
15171 start_lambda_scope (decl1
);
15177 /* Like start_preparsed_function, except that instead of a
15178 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
15180 Returns true on success. If the DECLARATOR is not suitable
15181 for a function, we return false, which tells the parser to
15182 skip the entire function. */
15185 start_function (cp_decl_specifier_seq
*declspecs
,
15186 const cp_declarator
*declarator
,
15191 decl1
= grokdeclarator (declarator
, declspecs
, FUNCDEF
, 1, &attrs
);
15192 invoke_plugin_callbacks (PLUGIN_START_PARSE_FUNCTION
, decl1
);
15193 if (decl1
== error_mark_node
)
15195 /* If the declarator is not suitable for a function definition,
15196 cause a syntax error. */
15197 if (decl1
== NULL_TREE
|| TREE_CODE (decl1
) != FUNCTION_DECL
)
15199 error ("invalid function declaration");
15203 if (DECL_MAIN_P (decl1
))
15204 /* main must return int. grokfndecl should have corrected it
15205 (and issued a diagnostic) if the user got it wrong. */
15206 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1
)),
15207 integer_type_node
));
15209 return start_preparsed_function (decl1
, attrs
, /*flags=*/SF_DEFAULT
);
15212 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
15216 use_eh_spec_block (tree fn
)
15218 return (flag_exceptions
&& flag_enforce_eh_specs
15219 && !processing_template_decl
15220 && !type_throw_all_p (TREE_TYPE (fn
))
15221 /* We insert the EH_SPEC_BLOCK only in the original
15222 function; then, it is copied automatically to the
15224 && !DECL_CLONED_FUNCTION_P (fn
)
15225 /* Implicitly-generated constructors and destructors have
15226 exception specifications. However, those specifications
15227 are the union of the possible exceptions specified by the
15228 constructors/destructors for bases and members, so no
15229 unallowed exception will ever reach this function. By
15230 not creating the EH_SPEC_BLOCK we save a little memory,
15231 and we avoid spurious warnings about unreachable
15233 && !DECL_DEFAULTED_FN (fn
));
15236 /* Store the parameter declarations into the current function declaration.
15237 This is called after parsing the parameter declarations, before
15238 digesting the body of the function.
15240 Also install to binding contour return value identifier, if any. */
15243 store_parm_decls (tree current_function_parms
)
15245 tree fndecl
= current_function_decl
;
15248 /* This is a chain of any other decls that came in among the parm
15249 declarations. If a parm is declared with enum {foo, bar} x;
15250 then CONST_DECLs for foo and bar are put here. */
15251 tree nonparms
= NULL_TREE
;
15253 if (current_function_parms
)
15255 /* This case is when the function was defined with an ANSI prototype.
15256 The parms already have decls, so we need not do anything here
15257 except record them as in effect
15258 and complain if any redundant old-style parm decls were written. */
15260 tree specparms
= current_function_parms
;
15263 /* Must clear this because it might contain TYPE_DECLs declared
15265 current_binding_level
->names
= NULL
;
15267 /* If we're doing semantic analysis, then we'll call pushdecl
15268 for each of these. We must do them in reverse order so that
15269 they end in the correct forward order. */
15270 specparms
= nreverse (specparms
);
15272 for (parm
= specparms
; parm
; parm
= next
)
15274 next
= DECL_CHAIN (parm
);
15275 if (TREE_CODE (parm
) == PARM_DECL
)
15279 /* If we find an enum constant or a type tag,
15280 put it aside for the moment. */
15281 TREE_CHAIN (parm
) = NULL_TREE
;
15282 nonparms
= chainon (nonparms
, parm
);
15286 /* Get the decls in their original chain order and record in the
15287 function. This is all and only the PARM_DECLs that were
15288 pushed into scope by the loop above. */
15289 DECL_ARGUMENTS (fndecl
) = get_local_decls ();
15292 DECL_ARGUMENTS (fndecl
) = NULL_TREE
;
15294 /* Now store the final chain of decls for the arguments
15295 as the decl-chain of the current lexical scope.
15296 Put the enumerators in as well, at the front so that
15297 DECL_ARGUMENTS is not modified. */
15298 current_binding_level
->names
= chainon (nonparms
, DECL_ARGUMENTS (fndecl
));
15300 if (use_eh_spec_block (current_function_decl
))
15301 current_eh_spec_block
= begin_eh_spec_block ();
15305 /* We have finished doing semantic analysis on DECL, but have not yet
15306 generated RTL for its body. Save away our current state, so that
15307 when we want to generate RTL later we know what to do. */
15310 save_function_data (tree decl
)
15312 struct language_function
*f
;
15314 /* Save the language-specific per-function data so that we can
15315 get it back when we really expand this function. */
15316 gcc_assert (!DECL_PENDING_INLINE_P (decl
));
15319 f
= ggc_alloc
<language_function
> ();
15320 memcpy (f
, cp_function_chain
, sizeof (struct language_function
));
15321 DECL_SAVED_FUNCTION_DATA (decl
) = f
;
15323 /* Clear out the bits we don't need. */
15324 f
->base
.x_stmt_tree
.x_cur_stmt_list
= NULL
;
15325 f
->bindings
= NULL
;
15326 f
->x_local_names
= NULL
;
15327 f
->base
.local_typedefs
= NULL
;
15331 /* Set the return value of the constructor (if present). */
15334 finish_constructor_body (void)
15339 if (targetm
.cxx
.cdtor_returns_this ())
15341 /* Any return from a constructor will end up here. */
15342 add_stmt (build_stmt (input_location
, LABEL_EXPR
, cdtor_label
));
15344 val
= DECL_ARGUMENTS (current_function_decl
);
15345 val
= build2 (MODIFY_EXPR
, TREE_TYPE (val
),
15346 DECL_RESULT (current_function_decl
), val
);
15347 /* Return the address of the object. */
15348 exprstmt
= build_stmt (input_location
, RETURN_EXPR
, val
);
15349 add_stmt (exprstmt
);
15353 /* Do all the processing for the beginning of a destructor; set up the
15354 vtable pointers and cleanups for bases and members. */
15357 begin_destructor_body (void)
15359 tree compound_stmt
;
15361 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
15362 issued an error message. We still want to try to process the
15363 body of the function, but initialize_vtbl_ptrs will crash if
15364 TYPE_BINFO is NULL. */
15365 if (COMPLETE_TYPE_P (current_class_type
))
15367 compound_stmt
= begin_compound_stmt (0);
15368 /* Make all virtual function table pointers in non-virtual base
15369 classes point to CURRENT_CLASS_TYPE's virtual function
15371 initialize_vtbl_ptrs (current_class_ptr
);
15372 finish_compound_stmt (compound_stmt
);
15374 if (flag_lifetime_dse
15375 /* Clobbering an empty base is harmful if it overlays real data. */
15376 && !is_empty_class (current_class_type
))
15378 if (sanitize_flags_p (SANITIZE_VPTR
)
15379 && (flag_sanitize_recover
& SANITIZE_VPTR
) == 0
15380 && TYPE_CONTAINS_VPTR_P (current_class_type
))
15382 tree binfo
= TYPE_BINFO (current_class_type
);
15384 = cp_build_fold_indirect_ref (current_class_ptr
);
15386 tree vtbl_ptr
= build_vfield_ref (ref
, TREE_TYPE (binfo
));
15387 tree vtbl
= build_zero_cst (TREE_TYPE (vtbl_ptr
));
15388 tree stmt
= cp_build_modify_expr (input_location
, vtbl_ptr
,
15390 tf_warning_or_error
);
15391 finish_decl_cleanup (NULL_TREE
, stmt
);
15394 finish_decl_cleanup (NULL_TREE
, build_clobber_this ());
15397 /* And insert cleanups for our bases and members so that they
15398 will be properly destroyed if we throw. */
15399 push_base_cleanups ();
15403 /* At the end of every destructor we generate code to delete the object if
15404 necessary. Do that now. */
15407 finish_destructor_body (void)
15411 /* Any return from a destructor will end up here; that way all base
15412 and member cleanups will be run when the function returns. */
15413 add_stmt (build_stmt (input_location
, LABEL_EXPR
, cdtor_label
));
15415 if (targetm
.cxx
.cdtor_returns_this ())
15419 val
= DECL_ARGUMENTS (current_function_decl
);
15420 val
= build2 (MODIFY_EXPR
, TREE_TYPE (val
),
15421 DECL_RESULT (current_function_decl
), val
);
15422 /* Return the address of the object. */
15423 exprstmt
= build_stmt (input_location
, RETURN_EXPR
, val
);
15424 add_stmt (exprstmt
);
15428 /* Do the necessary processing for the beginning of a function body, which
15429 in this case includes member-initializers, but not the catch clauses of
15430 a function-try-block. Currently, this means opening a binding level
15431 for the member-initializers (in a ctor), member cleanups (in a dtor),
15432 and capture proxies (in a lambda operator()). */
15435 begin_function_body (void)
15439 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl
))
15442 if (processing_template_decl
)
15443 /* Do nothing now. */;
15445 /* Always keep the BLOCK node associated with the outermost pair of
15446 curly braces of a function. These are needed for correct
15447 operation of dwarfout.c. */
15448 keep_next_level (true);
15450 stmt
= begin_compound_stmt (BCS_FN_BODY
);
15452 if (processing_template_decl
)
15453 /* Do nothing now. */;
15454 else if (DECL_DESTRUCTOR_P (current_function_decl
))
15455 begin_destructor_body ();
15460 /* Do the processing for the end of a function body. Currently, this means
15461 closing out the cleanups for fully-constructed bases and members, and in
15462 the case of the destructor, deleting the object if desired. Again, this
15463 is only meaningful for [cd]tors, since they are the only functions where
15464 there is a significant distinction between the main body and any
15465 function catch clauses. Handling, say, main() return semantics here
15466 would be wrong, as flowing off the end of a function catch clause for
15467 main() would also need to return 0. */
15470 finish_function_body (tree compstmt
)
15472 if (compstmt
== NULL_TREE
)
15475 /* Close the block. */
15476 finish_compound_stmt (compstmt
);
15478 if (processing_template_decl
)
15479 /* Do nothing now. */;
15480 else if (DECL_CONSTRUCTOR_P (current_function_decl
))
15481 finish_constructor_body ();
15482 else if (DECL_DESTRUCTOR_P (current_function_decl
))
15483 finish_destructor_body ();
15486 /* Given a function, returns the BLOCK corresponding to the outermost level
15487 of curly braces, skipping the artificial block created for constructor
15491 outer_curly_brace_block (tree fndecl
)
15493 tree block
= DECL_INITIAL (fndecl
);
15494 if (BLOCK_OUTER_CURLY_BRACE_P (block
))
15496 block
= BLOCK_SUBBLOCKS (block
);
15497 if (BLOCK_OUTER_CURLY_BRACE_P (block
))
15499 block
= BLOCK_SUBBLOCKS (block
);
15500 gcc_assert (BLOCK_OUTER_CURLY_BRACE_P (block
));
15504 /* If FNDECL is a class's key method, add the class to the list of
15505 keyed classes that should be emitted. */
15508 record_key_method_defined (tree fndecl
)
15510 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl
)
15511 && DECL_VIRTUAL_P (fndecl
)
15512 && !processing_template_decl
)
15514 tree fnclass
= DECL_CONTEXT (fndecl
);
15515 if (fndecl
== CLASSTYPE_KEY_METHOD (fnclass
))
15516 vec_safe_push (keyed_classes
, fnclass
);
15520 /* Subroutine of finish_function.
15521 Save the body of constexpr functions for possible
15522 future compile time evaluation. */
15525 maybe_save_function_definition (tree fun
)
15527 if (!processing_template_decl
15528 && DECL_DECLARED_CONSTEXPR_P (fun
)
15529 && !cp_function_chain
->invalid_constexpr
15530 && !DECL_CLONED_FUNCTION_P (fun
))
15531 register_constexpr_fundef (fun
, DECL_SAVED_TREE (fun
));
15534 /* Finish up a function declaration and compile that function
15535 all the way to assembler language output. The free the storage
15536 for the function definition. INLINE_P is TRUE if we just
15537 finished processing the body of an in-class inline function
15538 definition. (This processing will have taken place after the
15539 class definition is complete.) */
15542 finish_function (bool inline_p
)
15544 tree fndecl
= current_function_decl
;
15545 tree fntype
, ctype
= NULL_TREE
;
15547 /* When we get some parse errors, we can end up without a
15548 current_function_decl, so cope. */
15549 if (fndecl
== NULL_TREE
)
15550 return error_mark_node
;
15552 finish_lambda_scope ();
15554 if (c_dialect_objc ())
15555 objc_finish_function ();
15557 record_key_method_defined (fndecl
);
15559 fntype
= TREE_TYPE (fndecl
);
15561 /* TREE_READONLY (fndecl) = 1;
15562 This caused &foo to be of type ptr-to-const-function
15563 which then got a warning when stored in a ptr-to-function variable. */
15565 gcc_assert (building_stmt_list_p ());
15566 /* The current function is being defined, so its DECL_INITIAL should
15567 be set, and unless there's a multiple definition, it should be
15568 error_mark_node. */
15569 gcc_assert (DECL_INITIAL (fndecl
) == error_mark_node
);
15571 /* For a cloned function, we've already got all the code we need;
15572 there's no need to add any extra bits. */
15573 if (!DECL_CLONED_FUNCTION_P (fndecl
))
15575 /* Make it so that `main' always returns 0 by default. */
15576 if (DECL_MAIN_P (current_function_decl
))
15577 finish_return_stmt (integer_zero_node
);
15579 if (use_eh_spec_block (current_function_decl
))
15580 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
15581 (TREE_TYPE (current_function_decl
)),
15582 current_eh_spec_block
);
15585 /* If we're saving up tree structure, tie off the function now. */
15586 DECL_SAVED_TREE (fndecl
) = pop_stmt_list (DECL_SAVED_TREE (fndecl
));
15588 finish_fname_decls ();
15590 /* If this function can't throw any exceptions, remember that. */
15591 if (!processing_template_decl
15592 && !cp_function_chain
->can_throw
15593 && !flag_non_call_exceptions
15594 && !decl_replaceable_p (fndecl
))
15595 TREE_NOTHROW (fndecl
) = 1;
15597 /* This must come after expand_function_end because cleanups might
15598 have declarations (from inline functions) that need to go into
15599 this function's blocks. */
15601 /* If the current binding level isn't the outermost binding level
15602 for this function, either there is a bug, or we have experienced
15603 syntax errors and the statement tree is malformed. */
15604 if (current_binding_level
->kind
!= sk_function_parms
)
15606 /* Make sure we have already experienced errors. */
15607 gcc_assert (errorcount
);
15609 /* Throw away the broken statement tree and extra binding
15611 DECL_SAVED_TREE (fndecl
) = alloc_stmt_list ();
15613 while (current_binding_level
->kind
!= sk_function_parms
)
15615 if (current_binding_level
->kind
== sk_class
)
15616 pop_nested_class ();
15618 poplevel (0, 0, 0);
15621 poplevel (1, 0, 1);
15623 /* Statements should always be full-expressions at the outermost set
15624 of curly braces for a function. */
15625 gcc_assert (stmts_are_full_exprs_p ());
15627 /* If there are no return statements in a function with auto return type,
15628 the return type is void. But if the declared type is something like
15629 auto*, this is an error. */
15630 if (!processing_template_decl
&& FNDECL_USED_AUTO (fndecl
)
15631 && TREE_TYPE (fntype
) == current_function_auto_return_pattern
)
15633 if (is_auto (current_function_auto_return_pattern
))
15635 apply_deduced_return_type (fndecl
, void_type_node
);
15636 fntype
= TREE_TYPE (fndecl
);
15638 else if (!current_function_returns_value
15639 && !current_function_returns_null
)
15641 error ("no return statements in function returning %qT",
15642 current_function_auto_return_pattern
);
15643 inform (input_location
, "only plain %<auto%> return type can be "
15644 "deduced to %<void%>");
15648 // If this is a concept, check that the definition is reasonable.
15649 if (DECL_DECLARED_CONCEPT_P (fndecl
))
15650 check_function_concept (fndecl
);
15652 /* Lambda closure members are implicitly constexpr if possible. */
15653 if (cxx_dialect
>= cxx17
15654 && LAMBDA_TYPE_P (CP_DECL_CONTEXT (fndecl
)))
15655 DECL_DECLARED_CONSTEXPR_P (fndecl
)
15656 = ((processing_template_decl
15657 || is_valid_constexpr_fn (fndecl
, /*complain*/false))
15658 && potential_constant_expression (DECL_SAVED_TREE (fndecl
)));
15660 /* Save constexpr function body before it gets munged by
15661 the NRV transformation. */
15662 maybe_save_function_definition (fndecl
);
15664 /* Invoke the pre-genericize plugin before we start munging things. */
15665 if (!processing_template_decl
)
15666 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE
, fndecl
);
15668 /* Perform delayed folding before NRV transformation. */
15669 if (!processing_template_decl
)
15670 cp_fold_function (fndecl
);
15672 /* Set up the named return value optimization, if we can. Candidate
15673 variables are selected in check_return_expr. */
15674 if (current_function_return_value
)
15676 tree r
= current_function_return_value
;
15679 if (r
!= error_mark_node
15680 /* This is only worth doing for fns that return in memory--and
15681 simpler, since we don't have to worry about promoted modes. */
15682 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl
)), fndecl
)
15683 /* Only allow this for variables declared in the outer scope of
15684 the function so we know that their lifetime always ends with a
15685 return; see g++.dg/opt/nrv6.C. We could be more flexible if
15686 we were to do this optimization in tree-ssa. */
15687 && (outer
= outer_curly_brace_block (fndecl
))
15688 && chain_member (r
, BLOCK_VARS (outer
)))
15689 finalize_nrv (&DECL_SAVED_TREE (fndecl
), r
, DECL_RESULT (fndecl
));
15691 current_function_return_value
= NULL_TREE
;
15694 /* Remember that we were in class scope. */
15695 if (current_class_name
)
15696 ctype
= current_class_type
;
15698 /* Must mark the RESULT_DECL as being in this function. */
15699 DECL_CONTEXT (DECL_RESULT (fndecl
)) = fndecl
;
15701 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
15702 to the FUNCTION_DECL node itself. */
15703 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl
)) = fndecl
;
15705 /* Save away current state, if appropriate. */
15706 if (!processing_template_decl
)
15707 save_function_data (fndecl
);
15709 /* Complain if there's just no return statement. */
15710 if (warn_return_type
15711 && !VOID_TYPE_P (TREE_TYPE (fntype
))
15712 && !dependent_type_p (TREE_TYPE (fntype
))
15713 && !current_function_returns_value
&& !current_function_returns_null
15714 /* Don't complain if we abort or throw. */
15715 && !current_function_returns_abnormally
15716 /* Don't complain if there's an infinite loop. */
15717 && !current_function_infinite_loop
15718 /* Don't complain if we are declared noreturn. */
15719 && !TREE_THIS_VOLATILE (fndecl
)
15720 && !DECL_NAME (DECL_RESULT (fndecl
))
15721 && !TREE_NO_WARNING (fndecl
)
15722 /* Structor return values (if any) are set by the compiler. */
15723 && !DECL_CONSTRUCTOR_P (fndecl
)
15724 && !DECL_DESTRUCTOR_P (fndecl
)
15725 && targetm
.warn_func_return (fndecl
))
15727 warning (OPT_Wreturn_type
,
15728 "no return statement in function returning non-void");
15729 TREE_NO_WARNING (fndecl
) = 1;
15732 /* Store the end of the function, so that we get good line number
15733 info for the epilogue. */
15734 cfun
->function_end_locus
= input_location
;
15736 /* Complain about parameters that are only set, but never otherwise used. */
15737 if (warn_unused_but_set_parameter
15738 && !processing_template_decl
15739 && errorcount
== unused_but_set_errorcount
15740 && !DECL_CLONED_FUNCTION_P (fndecl
))
15744 for (decl
= DECL_ARGUMENTS (fndecl
);
15746 decl
= DECL_CHAIN (decl
))
15747 if (TREE_USED (decl
)
15748 && TREE_CODE (decl
) == PARM_DECL
15749 && !DECL_READ_P (decl
)
15750 && DECL_NAME (decl
)
15751 && !DECL_ARTIFICIAL (decl
)
15752 && !TREE_NO_WARNING (decl
)
15753 && !DECL_IN_SYSTEM_HEADER (decl
)
15754 && TREE_TYPE (decl
) != error_mark_node
15755 && TREE_CODE (TREE_TYPE (decl
)) != REFERENCE_TYPE
15756 && (!CLASS_TYPE_P (TREE_TYPE (decl
))
15757 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl
))))
15758 warning_at (DECL_SOURCE_LOCATION (decl
),
15759 OPT_Wunused_but_set_parameter
,
15760 "parameter %qD set but not used", decl
);
15761 unused_but_set_errorcount
= errorcount
;
15764 /* Complain about locally defined typedefs that are not used in this
15766 maybe_warn_unused_local_typedefs ();
15768 /* Possibly warn about unused parameters. */
15769 if (warn_unused_parameter
15770 && !processing_template_decl
15771 && !DECL_CLONED_FUNCTION_P (fndecl
))
15772 do_warn_unused_parameter (fndecl
);
15774 /* Genericize before inlining. */
15775 if (!processing_template_decl
)
15777 struct language_function
*f
= DECL_SAVED_FUNCTION_DATA (fndecl
);
15778 cp_genericize (fndecl
);
15779 /* Clear out the bits we don't need. */
15780 f
->x_current_class_ptr
= NULL
;
15781 f
->x_current_class_ref
= NULL
;
15782 f
->x_eh_spec_block
= NULL
;
15783 f
->x_in_charge_parm
= NULL
;
15784 f
->x_vtt_parm
= NULL
;
15785 f
->x_return_value
= NULL
;
15786 f
->bindings
= NULL
;
15787 f
->extern_decl_map
= NULL
;
15788 f
->infinite_loops
= NULL
;
15790 /* Clear out the bits we don't need. */
15791 local_names
= NULL
;
15793 /* We're leaving the context of this function, so zap cfun. It's still in
15794 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
15796 current_function_decl
= NULL
;
15798 /* If this is an in-class inline definition, we may have to pop the
15799 bindings for the template parameters that we added in
15800 maybe_begin_member_template_processing when start_function was
15803 maybe_end_member_template_processing ();
15805 /* Leave the scope of the class. */
15807 pop_nested_class ();
15812 current_function_decl
= NULL_TREE
;
15814 invoke_plugin_callbacks (PLUGIN_FINISH_PARSE_FUNCTION
, fndecl
);
15818 /* Create the FUNCTION_DECL for a function definition.
15819 DECLSPECS and DECLARATOR are the parts of the declaration;
15820 they describe the return type and the name of the function,
15821 but twisted together in a fashion that parallels the syntax of C.
15823 This function creates a binding context for the function body
15824 as well as setting up the FUNCTION_DECL in current_function_decl.
15826 Returns a FUNCTION_DECL on success.
15828 If the DECLARATOR is not suitable for a function (it defines a datum
15829 instead), we return 0, which tells yyparse to report a parse error.
15831 May return void_type_node indicating that this method is actually
15832 a friend. See grokfield for more details.
15834 Came here with a `.pushlevel' .
15836 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
15837 CHANGES TO CODE IN `grokfield'. */
15840 grokmethod (cp_decl_specifier_seq
*declspecs
,
15841 const cp_declarator
*declarator
, tree attrlist
)
15843 tree fndecl
= grokdeclarator (declarator
, declspecs
, MEMFUNCDEF
, 0,
15846 if (fndecl
== error_mark_node
)
15847 return error_mark_node
;
15849 if (fndecl
== NULL
|| TREE_CODE (fndecl
) != FUNCTION_DECL
)
15851 error ("invalid member function declaration");
15852 return error_mark_node
;
15856 cplus_decl_attributes (&fndecl
, attrlist
, 0);
15858 /* Pass friends other than inline friend functions back. */
15859 if (fndecl
== void_type_node
)
15862 if (DECL_IN_AGGR_P (fndecl
))
15864 if (DECL_CLASS_SCOPE_P (fndecl
))
15865 error ("%qD is already defined in class %qT", fndecl
,
15866 DECL_CONTEXT (fndecl
));
15867 return error_mark_node
;
15870 check_template_shadow (fndecl
);
15872 if (TREE_PUBLIC (fndecl
))
15873 DECL_COMDAT (fndecl
) = 1;
15874 DECL_DECLARED_INLINE_P (fndecl
) = 1;
15875 DECL_NO_INLINE_WARNING_P (fndecl
) = 1;
15877 /* We process method specializations in finish_struct_1. */
15878 if (processing_template_decl
&& !DECL_TEMPLATE_SPECIALIZATION (fndecl
))
15880 fndecl
= push_template_decl (fndecl
);
15881 if (fndecl
== error_mark_node
)
15885 if (! DECL_FRIEND_P (fndecl
))
15887 if (DECL_CHAIN (fndecl
))
15889 fndecl
= copy_node (fndecl
);
15890 TREE_CHAIN (fndecl
) = NULL_TREE
;
15894 cp_finish_decl (fndecl
, NULL_TREE
, false, NULL_TREE
, 0);
15896 DECL_IN_AGGR_P (fndecl
) = 1;
15901 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
15902 we can lay it out later, when and if its type becomes complete.
15904 Also handle constexpr variables where the initializer involves
15905 an unlowered PTRMEM_CST because the class isn't complete yet. */
15908 maybe_register_incomplete_var (tree var
)
15910 gcc_assert (VAR_P (var
));
15912 /* Keep track of variables with incomplete types. */
15913 if (!processing_template_decl
&& TREE_TYPE (var
) != error_mark_node
15914 && DECL_EXTERNAL (var
))
15916 tree inner_type
= TREE_TYPE (var
);
15918 while (TREE_CODE (inner_type
) == ARRAY_TYPE
)
15919 inner_type
= TREE_TYPE (inner_type
);
15920 inner_type
= TYPE_MAIN_VARIANT (inner_type
);
15922 if ((!COMPLETE_TYPE_P (inner_type
) && CLASS_TYPE_P (inner_type
))
15923 /* RTTI TD entries are created while defining the type_info. */
15924 || (TYPE_LANG_SPECIFIC (inner_type
)
15925 && TYPE_BEING_DEFINED (inner_type
)))
15927 incomplete_var iv
= {var
, inner_type
};
15928 vec_safe_push (incomplete_vars
, iv
);
15930 else if (!(DECL_LANG_SPECIFIC (var
) && DECL_TEMPLATE_INFO (var
))
15931 && decl_constant_var_p (var
)
15932 && (TYPE_PTRMEM_P (inner_type
) || CLASS_TYPE_P (inner_type
)))
15934 /* When the outermost open class is complete we can resolve any
15935 pointers-to-members. */
15936 tree context
= outermost_open_class ();
15937 incomplete_var iv
= {var
, context
};
15938 vec_safe_push (incomplete_vars
, iv
);
15943 /* Called when a class type (given by TYPE) is defined. If there are
15944 any existing VAR_DECLs whose type has been completed by this
15945 declaration, update them now. */
15948 complete_vars (tree type
)
15951 incomplete_var
*iv
;
15953 for (ix
= 0; vec_safe_iterate (incomplete_vars
, ix
, &iv
); )
15955 if (same_type_p (type
, iv
->incomplete_type
))
15957 tree var
= iv
->decl
;
15958 tree type
= TREE_TYPE (var
);
15960 if (type
!= error_mark_node
15961 && (TYPE_MAIN_VARIANT (strip_array_types (type
))
15962 == iv
->incomplete_type
))
15964 /* Complete the type of the variable. The VAR_DECL itself
15965 will be laid out in expand_expr. */
15966 complete_type (type
);
15967 cp_apply_type_quals_to_decl (cp_type_quals (type
), var
);
15970 /* Remove this entry from the list. */
15971 incomplete_vars
->unordered_remove (ix
);
15977 /* Check for pending declarations which may have abstract type. */
15978 complete_type_check_abstract (type
);
15981 /* If DECL is of a type which needs a cleanup, build and return an
15982 expression to perform that cleanup here. Return NULL_TREE if no
15983 cleanup need be done. DECL can also be a _REF when called from
15984 split_nonconstant_init_1. */
15987 cxx_maybe_build_cleanup (tree decl
, tsubst_flags_t complain
)
15993 /* Assume no cleanup is required. */
15994 cleanup
= NULL_TREE
;
15996 if (error_operand_p (decl
))
15999 /* Handle "__attribute__((cleanup))". We run the cleanup function
16000 before the destructor since the destructor is what actually
16001 terminates the lifetime of the object. */
16003 attr
= lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl
));
16012 /* Get the name specified by the user for the cleanup function. */
16013 id
= TREE_VALUE (TREE_VALUE (attr
));
16014 /* Look up the name to find the cleanup function to call. It is
16015 important to use lookup_name here because that is what is
16016 used in c-common.c:handle_cleanup_attribute when performing
16017 initial checks on the attribute. Note that those checks
16018 include ensuring that the function found is not an overloaded
16019 function, or an object with an overloaded call operator,
16020 etc.; we can rely on the fact that the function found is an
16021 ordinary FUNCTION_DECL. */
16022 fn
= lookup_name (id
);
16023 arg
= build_address (decl
);
16024 if (!mark_used (decl
, complain
) && !(complain
& tf_error
))
16025 return error_mark_node
;
16026 cleanup
= cp_build_function_call_nary (fn
, complain
, arg
, NULL_TREE
);
16027 if (cleanup
== error_mark_node
)
16028 return error_mark_node
;
16030 /* Handle ordinary C++ destructors. */
16031 type
= TREE_TYPE (decl
);
16032 if (type_build_dtor_call (type
))
16034 int flags
= LOOKUP_NORMAL
|LOOKUP_NONVIRTUAL
|LOOKUP_DESTRUCTOR
;
16038 if (TREE_CODE (type
) == ARRAY_TYPE
)
16041 addr
= build_address (decl
);
16043 call
= build_delete (TREE_TYPE (addr
), addr
,
16044 sfk_complete_destructor
, flags
, 0, complain
);
16045 if (call
== error_mark_node
)
16046 cleanup
= error_mark_node
;
16047 else if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type
))
16048 /* Discard the call. */;
16050 cleanup
= cp_build_compound_expr (cleanup
, call
, complain
);
16055 /* build_delete sets the location of the destructor call to the
16056 current location, even though the destructor is going to be
16057 called later, at the end of the current scope. This can lead to
16058 a "jumpy" behavior for users of debuggers when they step around
16059 the end of the block. So let's unset the location of the
16060 destructor call instead. */
16061 protected_set_expr_location (cleanup
, UNKNOWN_LOCATION
);
16065 && !lookup_attribute ("warn_unused", TYPE_ATTRIBUTES (TREE_TYPE (decl
)))
16066 /* Treat objects with destructors as used; the destructor may do
16067 something substantive. */
16068 && !mark_used (decl
, complain
) && !(complain
& tf_error
))
16069 return error_mark_node
;
16075 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
16076 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
16077 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
16080 static_fn_type (tree memfntype
)
16085 if (TYPE_PTRMEMFUNC_P (memfntype
))
16086 memfntype
= TYPE_PTRMEMFUNC_FN_TYPE (memfntype
);
16087 if (POINTER_TYPE_P (memfntype
)
16088 || TREE_CODE (memfntype
) == FUNCTION_DECL
)
16089 memfntype
= TREE_TYPE (memfntype
);
16090 if (TREE_CODE (memfntype
) == FUNCTION_TYPE
)
16092 gcc_assert (TREE_CODE (memfntype
) == METHOD_TYPE
);
16093 args
= TYPE_ARG_TYPES (memfntype
);
16094 cp_ref_qualifier rqual
= type_memfn_rqual (memfntype
);
16095 fntype
= build_function_type (TREE_TYPE (memfntype
), TREE_CHAIN (args
));
16096 fntype
= apply_memfn_quals (fntype
, type_memfn_quals (memfntype
), rqual
);
16097 fntype
= (cp_build_type_attribute_variant
16098 (fntype
, TYPE_ATTRIBUTES (memfntype
)));
16099 fntype
= (build_exception_variant
16100 (fntype
, TYPE_RAISES_EXCEPTIONS (memfntype
)));
16101 if (TYPE_HAS_LATE_RETURN_TYPE (memfntype
))
16102 TYPE_HAS_LATE_RETURN_TYPE (fntype
) = 1;
16106 /* DECL was originally constructed as a non-static member function,
16107 but turned out to be static. Update it accordingly. */
16110 revert_static_member_fn (tree decl
)
16112 tree stype
= static_fn_type (decl
);
16113 cp_cv_quals quals
= type_memfn_quals (stype
);
16114 cp_ref_qualifier rqual
= type_memfn_rqual (stype
);
16116 if (quals
!= TYPE_UNQUALIFIED
|| rqual
!= REF_QUAL_NONE
)
16117 stype
= apply_memfn_quals (stype
, TYPE_UNQUALIFIED
, REF_QUAL_NONE
);
16119 TREE_TYPE (decl
) = stype
;
16121 if (DECL_ARGUMENTS (decl
))
16122 DECL_ARGUMENTS (decl
) = DECL_CHAIN (DECL_ARGUMENTS (decl
));
16123 DECL_STATIC_FUNCTION_P (decl
) = 1;
16126 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
16127 one of the language-independent trees. */
16129 enum cp_tree_node_structure_enum
16130 cp_tree_node_structure (union lang_tree_node
* t
)
16132 switch (TREE_CODE (&t
->generic
))
16134 case DEFAULT_ARG
: return TS_CP_DEFAULT_ARG
;
16135 case DEFERRED_NOEXCEPT
: return TS_CP_DEFERRED_NOEXCEPT
;
16136 case IDENTIFIER_NODE
: return TS_CP_IDENTIFIER
;
16137 case OVERLOAD
: return TS_CP_OVERLOAD
;
16138 case TEMPLATE_PARM_INDEX
: return TS_CP_TPI
;
16139 case PTRMEM_CST
: return TS_CP_PTRMEM
;
16140 case BASELINK
: return TS_CP_BASELINK
;
16141 case TEMPLATE_DECL
: return TS_CP_TEMPLATE_DECL
;
16142 case STATIC_ASSERT
: return TS_CP_STATIC_ASSERT
;
16143 case ARGUMENT_PACK_SELECT
: return TS_CP_ARGUMENT_PACK_SELECT
;
16144 case TRAIT_EXPR
: return TS_CP_TRAIT_EXPR
;
16145 case LAMBDA_EXPR
: return TS_CP_LAMBDA_EXPR
;
16146 case TEMPLATE_INFO
: return TS_CP_TEMPLATE_INFO
;
16147 case CONSTRAINT_INFO
: return TS_CP_CONSTRAINT_INFO
;
16148 case USERDEF_LITERAL
: return TS_CP_USERDEF_LITERAL
;
16149 default: return TS_CP_GENERIC
;
16153 /* Build the void_list_node (void_type_node having been created). */
16155 build_void_list_node (void)
16157 tree t
= build_tree_list (NULL_TREE
, void_type_node
);
16162 cp_missing_noreturn_ok_p (tree decl
)
16164 /* A missing noreturn is ok for the `main' function. */
16165 return DECL_MAIN_P (decl
);
16168 /* Return the decl used to identify the COMDAT group into which DECL should
16172 cxx_comdat_group (tree decl
)
16174 /* Virtual tables, construction virtual tables, and virtual table
16175 tables all go in a single COMDAT group, named after the primary
16177 if (VAR_P (decl
) && DECL_VTABLE_OR_VTT_P (decl
))
16178 decl
= CLASSTYPE_VTABLES (DECL_CONTEXT (decl
));
16179 /* For all other DECLs, the COMDAT group is the mangled name of the
16180 declaration itself. */
16183 while (DECL_THUNK_P (decl
))
16185 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
16186 into the same section as the target function. In that case
16187 we must return target's name. */
16188 tree target
= THUNK_TARGET (decl
);
16189 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target
)
16190 && DECL_SECTION_NAME (target
) != NULL
16191 && DECL_ONE_ONLY (target
))
16201 /* Returns the return type for FN as written by the user, which may include
16202 a placeholder for a deduced return type. */
16205 fndecl_declared_return_type (tree fn
)
16207 fn
= STRIP_TEMPLATE (fn
);
16208 if (FNDECL_USED_AUTO (fn
))
16210 struct language_function
*f
= NULL
;
16211 if (DECL_STRUCT_FUNCTION (fn
))
16212 f
= DECL_STRUCT_FUNCTION (fn
)->language
;
16214 f
= DECL_SAVED_FUNCTION_DATA (fn
);
16215 return f
->x_auto_return_pattern
;
16217 return TREE_TYPE (TREE_TYPE (fn
));
16220 /* Returns true iff DECL is a variable or function declared with an auto type
16221 that has not yet been deduced to a real type. */
16224 undeduced_auto_decl (tree decl
)
16226 if (cxx_dialect
< cxx11
)
16228 return ((VAR_OR_FUNCTION_DECL_P (decl
)
16229 || TREE_CODE (decl
) == TEMPLATE_DECL
)
16230 && type_uses_auto (TREE_TYPE (decl
)));
16233 /* Complain if DECL has an undeduced return type. */
16236 require_deduced_type (tree decl
, tsubst_flags_t complain
)
16238 if (undeduced_auto_decl (decl
))
16240 if (complain
& tf_error
)
16241 error ("use of %qD before deduction of %<auto%>", decl
);
16247 #include "gt-cp-decl.h"