1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988-2019 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"
54 #include "gcc-rich-location.h"
55 #include "langhooks.h"
57 /* Possible cases of bad specifiers type used by bad_specifiers. */
59 BSP_VAR
, /* variable */
60 BSP_PARM
, /* parameter */
65 static const char *redeclaration_error_message (tree
, tree
);
67 static int decl_jump_unsafe (tree
);
68 static void require_complete_types_for_parms (tree
);
69 static tree
grok_reference_init (tree
, tree
, tree
, int);
70 static tree
grokvardecl (tree
, tree
, tree
, const cp_decl_specifier_seq
*,
71 int, int, int, bool, int, tree
, location_t
);
72 static void check_static_variable_definition (tree
, tree
);
73 static void record_unknown_type (tree
, const char *);
74 static tree
builtin_function_1 (tree
, tree
, bool);
75 static int member_function_or_else (tree
, tree
, enum overload_flags
);
76 static tree
local_variable_p_walkfn (tree
*, int *, void *);
77 static const char *tag_name (enum tag_types
);
78 static tree
lookup_and_check_tag (enum tag_types
, tree
, tag_scope
, bool);
79 static void maybe_deduce_size_from_array_init (tree
, tree
);
80 static void layout_var_decl (tree
);
81 static tree
check_initializer (tree
, tree
, int, vec
<tree
, va_gc
> **);
82 static void make_rtl_for_nonlocal_decl (tree
, tree
, const char *);
83 static void save_function_data (tree
);
84 static void copy_type_enum (tree
, tree
);
85 static void check_function_type (tree
, tree
);
86 static void finish_constructor_body (void);
87 static void begin_destructor_body (void);
88 static void finish_destructor_body (void);
89 static void record_key_method_defined (tree
);
90 static tree
create_array_type_for_decl (tree
, tree
, tree
, location_t
);
91 static tree
get_atexit_node (void);
92 static tree
get_dso_handle_node (void);
93 static tree
start_cleanup_fn (void);
94 static void end_cleanup_fn (void);
95 static tree
cp_make_fname_decl (location_t
, tree
, int);
96 static void initialize_predefined_identifiers (void);
97 static tree check_special_function_return_type
98 (special_function_kind
, tree
, tree
, int, const location_t
*);
99 static tree
push_cp_library_fn (enum tree_code
, tree
, int);
100 static tree
build_cp_library_fn (tree
, enum tree_code
, tree
, int);
101 static void store_parm_decls (tree
);
102 static void initialize_local_var (tree
, tree
);
103 static void expand_static_init (tree
, tree
);
105 /* The following symbols are subsumed in the cp_global_trees array, and
106 listed here individually for documentation purposes.
109 tree wchar_decl_node;
111 tree vtable_entry_type;
112 tree delta_type_node;
113 tree __t_desc_type_node;
115 tree class_type_node;
116 tree unknown_type_node;
118 Array type `vtable_entry_type[]'
121 tree vtbl_ptr_type_node;
128 A FUNCTION_DECL which can call `abort'. Not necessarily the
129 one that the user will declare, but sufficient to be called
130 by routines that want to abort the program.
135 tree type_info_type_node, tinfo_decl_id, tinfo_decl_type;
136 tree tinfo_var_id; */
138 tree cp_global_trees
[CPTI_MAX
];
140 /* A list of objects which have constructors or destructors
141 which reside in the global scope. The decl is stored in
142 the TREE_VALUE slot and the initializer is stored
143 in the TREE_PURPOSE slot. */
144 tree static_aggregates
;
146 /* Like static_aggregates, but for thread_local variables. */
151 /* A node for the integer constant 2. */
153 tree integer_two_node
;
155 /* vector of static decls. */
156 vec
<tree
, va_gc
> *static_decls
;
158 /* vector of keyed classes. */
159 vec
<tree
, va_gc
> *keyed_classes
;
161 /* Used only for jumps to as-yet undefined labels, since jumps to
162 defined labels can have their validity checked immediately. */
164 struct GTY((chain_next ("%h.next"))) named_label_use_entry
{
165 struct named_label_use_entry
*next
;
166 /* The binding level to which this entry is *currently* attached.
167 This is initially the binding level in which the goto appeared,
168 but is modified as scopes are closed. */
169 cp_binding_level
*binding_level
;
170 /* The head of the names list that was current when the goto appeared,
171 or the inner scope popped. These are the decls that will *not* be
172 skipped when jumping to the label. */
174 /* The location of the goto, for error reporting. */
175 location_t o_goto_locus
;
176 /* True if an OpenMP structured block scope has been closed since
177 the goto appeared. This means that the branch from the label will
178 illegally exit an OpenMP scope. */
182 /* A list of all LABEL_DECLs in the function that have names. Here so
183 we can clear out their names' definitions at the end of the
184 function, and so we can check the validity of jumps to these labels. */
186 struct GTY((for_user
)) named_label_entry
{
188 tree name
; /* Name of decl. */
190 tree label_decl
; /* LABEL_DECL, unless deleted local label. */
192 named_label_entry
*outer
; /* Outer shadowed chain. */
194 /* The binding level to which the label is *currently* attached.
195 This is initially set to the binding level in which the label
196 is defined, but is modified as scopes are closed. */
197 cp_binding_level
*binding_level
;
199 /* The head of the names list that was current when the label was
200 defined, or the inner scope popped. These are the decls that will
201 be skipped when jumping to the label. */
204 /* A vector of all decls from all binding levels that would be
205 crossed by a backward branch to the label. */
206 vec
<tree
, va_gc
> *bad_decls
;
208 /* A list of uses of the label, before the label is defined. */
209 named_label_use_entry
*uses
;
211 /* The following bits are set after the label is defined, and are
212 updated as scopes are popped. They indicate that a jump to the
213 label will illegally enter a scope of the given flavor. */
217 bool in_transaction_scope
;
218 bool in_constexpr_if
;
221 #define named_labels cp_function_chain->x_named_labels
223 /* The number of function bodies which we are currently processing.
224 (Zero if we are at namespace scope, one inside the body of a
225 function, two inside the body of a function in a local class, etc.) */
228 /* Whether the exception-specifier is part of a function type (i.e. C++17). */
229 bool flag_noexcept_type
;
231 /* States indicating how grokdeclarator() should handle declspecs marked
232 with __attribute__((deprecated)). An object declared as
233 __attribute__((deprecated)) suppresses warnings of uses of other
235 enum deprecated_states deprecated_state
= DEPRECATED_NORMAL
;
238 /* A list of VAR_DECLs whose type was incomplete at the time the
239 variable was declared. */
241 struct GTY(()) incomplete_var
{
243 tree incomplete_type
;
247 static GTY(()) vec
<incomplete_var
, va_gc
> *incomplete_vars
;
249 /* Returns the kind of template specialization we are currently
250 processing, given that it's declaration contained N_CLASS_SCOPES
251 explicit scope qualifications. */
254 current_tmpl_spec_kind (int n_class_scopes
)
256 int n_template_parm_scopes
= 0;
257 int seen_specialization_p
= 0;
258 int innermost_specialization_p
= 0;
261 /* Scan through the template parameter scopes. */
262 for (b
= current_binding_level
;
263 b
->kind
== sk_template_parms
;
266 /* If we see a specialization scope inside a parameter scope,
267 then something is wrong. That corresponds to a declaration
270 template <class T> template <> ...
272 which is always invalid since [temp.expl.spec] forbids the
273 specialization of a class member template if the enclosing
274 class templates are not explicitly specialized as well. */
275 if (b
->explicit_spec_p
)
277 if (n_template_parm_scopes
== 0)
278 innermost_specialization_p
= 1;
280 seen_specialization_p
= 1;
282 else if (seen_specialization_p
== 1)
283 return tsk_invalid_member_spec
;
285 ++n_template_parm_scopes
;
288 /* Handle explicit instantiations. */
289 if (processing_explicit_instantiation
)
291 if (n_template_parm_scopes
!= 0)
292 /* We've seen a template parameter list during an explicit
293 instantiation. For example:
295 template <class T> template void f(int);
297 This is erroneous. */
298 return tsk_invalid_expl_inst
;
300 return tsk_expl_inst
;
303 if (n_template_parm_scopes
< n_class_scopes
)
304 /* We've not seen enough template headers to match all the
305 specialized classes present. For example:
307 template <class T> void R<T>::S<T>::f(int);
309 This is invalid; there needs to be one set of template
310 parameters for each class. */
311 return tsk_insufficient_parms
;
312 else if (n_template_parm_scopes
== n_class_scopes
)
313 /* We're processing a non-template declaration (even though it may
314 be a member of a template class.) For example:
316 template <class T> void S<T>::f(int);
318 The `class T' matches the `S<T>', leaving no template headers
319 corresponding to the `f'. */
321 else if (n_template_parm_scopes
> n_class_scopes
+ 1)
322 /* We've got too many template headers. For example:
324 template <> template <class T> void f (T);
326 There need to be more enclosing classes. */
327 return tsk_excessive_parms
;
329 /* This must be a template. It's of the form:
331 template <class T> template <class U> void S<T>::f(U);
333 This is a specialization if the innermost level was a
334 specialization; otherwise it's just a definition of the
336 return innermost_specialization_p
? tsk_expl_spec
: tsk_template
;
339 /* Exit the current scope. */
347 /* When a label goes out of scope, check to see if that label was used
348 in a valid manner, and issue any appropriate warnings or errors. */
351 check_label_used (tree label
)
353 if (!processing_template_decl
)
355 if (DECL_INITIAL (label
) == NULL_TREE
)
359 error ("label %q+D used but not defined", label
);
360 location
= input_location
;
361 /* FIXME want (LOCATION_FILE (input_location), (line)0) */
362 /* Avoid crashing later. */
363 define_label (location
, DECL_NAME (label
));
366 warn_for_unused_label (label
);
370 /* Helper function to sort named label entries in a vector by DECL_UID. */
373 sort_labels (const void *a
, const void *b
)
375 tree label1
= *(tree
const *) a
;
376 tree label2
= *(tree
const *) b
;
378 /* DECL_UIDs can never be equal. */
379 return DECL_UID (label1
) > DECL_UID (label2
) ? -1 : +1;
382 /* At the end of a function, all labels declared within the function
383 go out of scope. BLOCK is the top-level block for the
387 pop_labels (tree block
)
392 /* We need to add the labels to the block chain, so debug
393 information is emitted. But, we want the order to be stable so
394 need to sort them first. Otherwise the debug output could be
395 randomly ordered. I guess it's mostly stable, unless the hash
396 table implementation changes. */
397 auto_vec
<tree
, 32> labels (named_labels
->elements ());
398 hash_table
<named_label_hash
>::iterator
end (named_labels
->end ());
399 for (hash_table
<named_label_hash
>::iterator iter
400 (named_labels
->begin ()); iter
!= end
; ++iter
)
402 named_label_entry
*ent
= *iter
;
404 gcc_checking_assert (!ent
->outer
);
406 labels
.quick_push (ent
->label_decl
);
410 labels
.qsort (sort_labels
);
412 while (labels
.length ())
414 tree label
= labels
.pop ();
416 DECL_CHAIN (label
) = BLOCK_VARS (block
);
417 BLOCK_VARS (block
) = label
;
419 check_label_used (label
);
423 /* At the end of a block with local labels, restore the outer definition. */
426 pop_local_label (tree id
, tree label
)
428 check_label_used (label
);
429 named_label_entry
**slot
= named_labels
->find_slot_with_hash
430 (id
, IDENTIFIER_HASH_VALUE (id
), NO_INSERT
);
431 named_label_entry
*ent
= *slot
;
437 ent
= ggc_cleared_alloc
<named_label_entry
> ();
443 /* The following two routines are used to interface to Objective-C++.
444 The binding level is purposely treated as an opaque type. */
447 objc_get_current_scope (void)
449 return current_binding_level
;
452 /* The following routine is used by the NeXT-style SJLJ exceptions;
453 variables get marked 'volatile' so as to not be clobbered by
454 _setjmp()/_longjmp() calls. All variables in the current scope,
455 as well as parent scopes up to (but not including) ENCLOSING_BLK
456 shall be thusly marked. */
459 objc_mark_locals_volatile (void *enclosing_blk
)
461 cp_binding_level
*scope
;
463 for (scope
= current_binding_level
;
464 scope
&& scope
!= enclosing_blk
;
465 scope
= scope
->level_chain
)
469 for (decl
= scope
->names
; decl
; decl
= TREE_CHAIN (decl
))
470 objc_volatilize_decl (decl
);
472 /* Do not climb up past the current function. */
473 if (scope
->kind
== sk_function_parms
)
478 /* True if B is the level for the condition of a constexpr if. */
481 level_for_constexpr_if (cp_binding_level
*b
)
483 return (b
->kind
== sk_cond
&& b
->this_entity
484 && TREE_CODE (b
->this_entity
) == IF_STMT
485 && IF_STMT_CONSTEXPR_P (b
->this_entity
));
488 /* Update data for defined and undefined labels when leaving a scope. */
491 poplevel_named_label_1 (named_label_entry
**slot
, cp_binding_level
*bl
)
493 named_label_entry
*ent
= *slot
;
494 cp_binding_level
*obl
= bl
->level_chain
;
496 if (ent
->binding_level
== bl
)
500 /* ENT->NAMES_IN_SCOPE may contain a mixture of DECLs and
501 TREE_LISTs representing OVERLOADs, so be careful. */
502 for (decl
= ent
->names_in_scope
; decl
; decl
= (DECL_P (decl
)
504 : TREE_CHAIN (decl
)))
505 if (decl_jump_unsafe (decl
))
506 vec_safe_push (ent
->bad_decls
, decl
);
508 ent
->binding_level
= obl
;
509 ent
->names_in_scope
= obl
->names
;
513 ent
->in_try_scope
= true;
516 ent
->in_catch_scope
= true;
519 ent
->in_omp_scope
= true;
522 ent
->in_transaction_scope
= true;
525 if (level_for_constexpr_if (bl
->level_chain
))
526 ent
->in_constexpr_if
= true;
534 struct named_label_use_entry
*use
;
536 for (use
= ent
->uses
; use
; use
= use
->next
)
537 if (use
->binding_level
== bl
)
539 use
->binding_level
= obl
;
540 use
->names_in_scope
= obl
->names
;
541 if (bl
->kind
== sk_omp
)
542 use
->in_omp_scope
= true;
549 /* Saved errorcount to avoid -Wunused-but-set-{parameter,variable} warnings
550 when errors were reported, except for -Werror-unused-but-set-*. */
551 static int unused_but_set_errorcount
;
553 /* Exit a binding level.
554 Pop the level off, and restore the state of the identifier-decl mappings
555 that were in effect when this level was entered.
557 If KEEP == 1, this level had explicit declarations, so
558 and create a "block" (a BLOCK node) for the level
559 to record its declarations and subblocks for symbol table output.
561 If FUNCTIONBODY is nonzero, this level is the body of a function,
562 so create a block as if KEEP were set and also clear out all
565 If REVERSE is nonzero, reverse the order of decls before putting
566 them into the BLOCK. */
569 poplevel (int keep
, int reverse
, int functionbody
)
572 /* The chain of decls was accumulated in reverse order.
573 Put it into forward order, just for cleanliness. */
580 bool subtime
= timevar_cond_start (TV_NAME_LOOKUP
);
585 gcc_assert (current_binding_level
->kind
!= sk_class
586 && current_binding_level
->kind
!= sk_namespace
);
588 if (current_binding_level
->kind
== sk_cleanup
)
590 subblocks
= functionbody
>= 0 ? current_binding_level
->blocks
: 0;
592 gcc_assert (!vec_safe_length (current_binding_level
->class_shadowed
));
594 /* We used to use KEEP == 2 to indicate that the new block should go
595 at the beginning of the list of blocks at this binding level,
596 rather than the end. This hack is no longer used. */
597 gcc_assert (keep
== 0 || keep
== 1);
599 if (current_binding_level
->keep
)
602 /* Any uses of undefined labels, and any defined labels, now operate
603 under constraints of next binding contour. */
604 if (cfun
&& !functionbody
&& named_labels
)
605 named_labels
->traverse
<cp_binding_level
*, poplevel_named_label_1
>
606 (current_binding_level
);
608 /* Get the decls in the order they were written.
609 Usually current_binding_level->names is in reverse order.
610 But parameter decls were previously put in forward order. */
612 decls
= current_binding_level
->names
;
615 decls
= nreverse (decls
);
616 current_binding_level
->names
= decls
;
619 /* If there were any declarations or structure tags in that level,
620 or if this level is a function body,
621 create a BLOCK to record them for the life of this function. */
623 /* Avoid function body block if possible. */
624 if (functionbody
&& subblocks
&& BLOCK_CHAIN (subblocks
) == NULL_TREE
)
626 else if (keep
== 1 || functionbody
)
627 block
= make_node (BLOCK
);
628 if (block
!= NULL_TREE
)
630 BLOCK_VARS (block
) = decls
;
631 BLOCK_SUBBLOCKS (block
) = subblocks
;
634 /* In each subblock, record that this is its superior. */
636 for (link
= subblocks
; link
; link
= BLOCK_CHAIN (link
))
637 BLOCK_SUPERCONTEXT (link
) = block
;
639 /* Before we remove the declarations first check for unused variables. */
640 if ((warn_unused_variable
|| warn_unused_but_set_variable
)
641 && current_binding_level
->kind
!= sk_template_parms
642 && !processing_template_decl
)
643 for (tree d
= get_local_decls (); d
; d
= TREE_CHAIN (d
))
645 /* There are cases where D itself is a TREE_LIST. See in
646 push_local_binding where the list of decls returned by
647 getdecls is built. */
648 decl
= TREE_CODE (d
) == TREE_LIST
? TREE_VALUE (d
) : d
;
650 tree type
= TREE_TYPE (decl
);
652 && (! TREE_USED (decl
) || !DECL_READ_P (decl
))
653 && ! DECL_IN_SYSTEM_HEADER (decl
)
654 /* For structured bindings, consider only real variables, not
656 && (DECL_DECOMPOSITION_P (decl
) ? !DECL_DECOMP_BASE (decl
)
657 : (DECL_NAME (decl
) && !DECL_ARTIFICIAL (decl
)))
658 && type
!= error_mark_node
659 && (!CLASS_TYPE_P (type
)
660 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
)
661 || lookup_attribute ("warn_unused",
662 TYPE_ATTRIBUTES (TREE_TYPE (decl
)))))
664 if (! TREE_USED (decl
))
666 if (!DECL_NAME (decl
) && DECL_DECOMPOSITION_P (decl
))
667 warning_at (DECL_SOURCE_LOCATION (decl
),
668 OPT_Wunused_variable
,
669 "unused structured binding declaration");
671 warning_at (DECL_SOURCE_LOCATION (decl
),
672 OPT_Wunused_variable
, "unused variable %qD", decl
);
674 else if (DECL_CONTEXT (decl
) == current_function_decl
675 // For -Wunused-but-set-variable leave references alone.
676 && !TYPE_REF_P (TREE_TYPE (decl
))
677 && errorcount
== unused_but_set_errorcount
)
679 if (!DECL_NAME (decl
) && DECL_DECOMPOSITION_P (decl
))
680 warning_at (DECL_SOURCE_LOCATION (decl
),
681 OPT_Wunused_but_set_variable
, "structured "
682 "binding declaration set but not used");
684 warning_at (DECL_SOURCE_LOCATION (decl
),
685 OPT_Wunused_but_set_variable
,
686 "variable %qD set but not used", decl
);
687 unused_but_set_errorcount
= errorcount
;
692 /* Remove declarations for all the DECLs in this level. */
693 for (link
= decls
; link
; link
= TREE_CHAIN (link
))
695 decl
= TREE_CODE (link
) == TREE_LIST
? TREE_VALUE (link
) : link
;
696 tree name
= OVL_NAME (decl
);
698 /* Remove the binding. */
699 if (TREE_CODE (decl
) == LABEL_DECL
)
700 pop_local_label (name
, decl
);
702 pop_local_binding (name
, decl
);
705 /* Restore the IDENTIFIER_TYPE_VALUEs. */
706 for (link
= current_binding_level
->type_shadowed
;
707 link
; link
= TREE_CHAIN (link
))
708 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (link
), TREE_VALUE (link
));
710 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
711 list if a `using' declaration put them there. The debugging
712 back ends won't understand OVERLOAD, so we remove them here.
713 Because the BLOCK_VARS are (temporarily) shared with
714 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
715 popped all the bindings. Also remove undeduced 'auto' decls,
716 which LTO doesn't understand, and can't have been used by anything. */
721 for (d
= &BLOCK_VARS (block
); *d
; )
723 if (TREE_CODE (*d
) == TREE_LIST
724 || (!processing_template_decl
725 && undeduced_auto_decl (*d
)))
726 *d
= TREE_CHAIN (*d
);
728 d
= &DECL_CHAIN (*d
);
732 /* If the level being exited is the top level of a function,
733 check over all the labels. */
738 /* Since this is the top level block of a function, the vars are
739 the function's parameters. Don't leave them in the BLOCK
740 because they are found in the FUNCTION_DECL instead. */
741 BLOCK_VARS (block
) = 0;
745 pop_labels (subblocks
);
748 kind
= current_binding_level
->kind
;
749 if (kind
== sk_cleanup
)
753 /* If this is a temporary binding created for a cleanup, then we'll
754 have pushed a statement list level. Pop that, create a new
755 BIND_EXPR for the block, and insert it into the stream. */
756 stmt
= pop_stmt_list (current_binding_level
->statement_list
);
757 stmt
= c_build_bind_expr (input_location
, block
, stmt
);
764 /* The current function is being defined, so its DECL_INITIAL
765 should be error_mark_node. */
766 gcc_assert (DECL_INITIAL (current_function_decl
) == error_mark_node
);
767 DECL_INITIAL (current_function_decl
) = block
? block
: subblocks
;
770 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl
))
772 if (BLOCK_SUBBLOCKS (subblocks
))
773 BLOCK_OUTER_CURLY_BRACE_P (BLOCK_SUBBLOCKS (subblocks
)) = 1;
776 BLOCK_OUTER_CURLY_BRACE_P (subblocks
) = 1;
780 current_binding_level
->blocks
781 = block_chainon (current_binding_level
->blocks
, block
);
783 /* If we did not make a block for the level just exited,
784 any blocks made for inner levels
785 (since they cannot be recorded as subblocks in that level)
786 must be carried forward so they will later become subblocks
787 of something else. */
789 current_binding_level
->blocks
790 = block_chainon (current_binding_level
->blocks
, subblocks
);
792 /* Each and every BLOCK node created here in `poplevel' is important
793 (e.g. for proper debugging information) so if we created one
794 earlier, mark it as "used". */
796 TREE_USED (block
) = 1;
798 /* All temporary bindings created for cleanups are popped silently. */
799 if (kind
== sk_cleanup
)
802 timevar_cond_stop (TV_NAME_LOOKUP
, subtime
);
806 /* Call wrapup_globals_declarations for the globals in NAMESPACE. */
807 /* Diagnose odr-used extern inline variables without definitions
808 in the current TU. */
811 wrapup_namespace_globals ()
813 if (vec
<tree
, va_gc
> *statics
= static_decls
)
817 FOR_EACH_VEC_ELT (*statics
, i
, decl
)
819 if (warn_unused_function
820 && TREE_CODE (decl
) == FUNCTION_DECL
821 && DECL_INITIAL (decl
) == 0
822 && DECL_EXTERNAL (decl
)
823 && !TREE_PUBLIC (decl
)
824 && !DECL_ARTIFICIAL (decl
)
825 && !DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl
)
826 && !TREE_NO_WARNING (decl
))
827 warning_at (DECL_SOURCE_LOCATION (decl
),
828 OPT_Wunused_function
,
829 "%qF declared %<static%> but never defined", decl
);
832 && DECL_EXTERNAL (decl
)
833 && DECL_INLINE_VAR_P (decl
)
834 && DECL_ODR_USED (decl
))
835 error_at (DECL_SOURCE_LOCATION (decl
),
836 "odr-used inline variable %qD is not defined", decl
);
839 /* Clear out the list, so we don't rescan next time. */
842 /* Write out any globals that need to be output. */
843 return wrapup_global_declarations (statics
->address (),
849 /* In C++, you don't have to write `struct S' to refer to `S'; you
850 can just use `S'. We accomplish this by creating a TYPE_DECL as
851 if the user had written `typedef struct S S'. Create and return
852 the TYPE_DECL for TYPE. */
855 create_implicit_typedef (tree name
, tree type
)
859 decl
= build_decl (input_location
, TYPE_DECL
, name
, type
);
860 DECL_ARTIFICIAL (decl
) = 1;
861 /* There are other implicit type declarations, like the one *within*
862 a class that allows you to write `S::S'. We must distinguish
864 SET_DECL_IMPLICIT_TYPEDEF_P (decl
);
865 TYPE_NAME (type
) = decl
;
866 TYPE_STUB_DECL (type
) = decl
;
871 /* Function-scope local entities that need discriminators. Each entry
872 is a {decl,name} pair. VAR_DECLs for anon unions get their name
873 smashed, so we cannot rely on DECL_NAME. */
875 static GTY((deletable
)) vec
<tree
, va_gc
> *local_entities
;
877 /* Determine the mangling discriminator of local DECL. There are
878 generally very few of these in any particular function. */
881 determine_local_discriminator (tree decl
)
883 bool subtime
= timevar_cond_start (TV_NAME_LOOKUP
);
884 retrofit_lang_decl (decl
);
885 tree ctx
= DECL_CONTEXT (decl
);
886 tree name
= (TREE_CODE (decl
) == TYPE_DECL
887 && TYPE_UNNAMED_P (TREE_TYPE (decl
))
888 ? NULL_TREE
: DECL_NAME (decl
));
889 size_t nelts
= vec_safe_length (local_entities
);
890 for (size_t i
= 0; i
< nelts
; i
+= 2)
892 tree
*pair
= &(*local_entities
)[i
];
895 gcc_checking_assert (d
!= decl
);
897 && TREE_CODE (decl
) == TREE_CODE (d
)
898 && ctx
== DECL_CONTEXT (d
))
900 tree disc
= integer_one_node
;
901 if (DECL_DISCRIMINATOR (d
))
902 disc
= build_int_cst (TREE_TYPE (disc
),
903 TREE_INT_CST_LOW (DECL_DISCRIMINATOR (d
)) + 1);
904 DECL_DISCRIMINATOR (decl
) = disc
;
905 /* Replace the saved decl. */
914 vec_safe_reserve (local_entities
, 2);
915 local_entities
->quick_push (decl
);
916 local_entities
->quick_push (name
);
919 timevar_cond_stop (TV_NAME_LOOKUP
, subtime
);
923 /* Subroutine of duplicate_decls: return truthvalue of whether
924 or not types of these decls match.
926 For C++, we must compare the parameter list so that `int' can match
927 `int&' in a parameter position, but `int&' is not confused with
931 decls_match (tree newdecl
, tree olddecl
, bool record_versions
/* = true */)
935 if (newdecl
== olddecl
)
938 if (TREE_CODE (newdecl
) != TREE_CODE (olddecl
))
939 /* If the two DECLs are not even the same kind of thing, we're not
940 interested in their types. */
943 gcc_assert (DECL_P (newdecl
));
945 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
947 tree f1
= TREE_TYPE (newdecl
);
948 tree f2
= TREE_TYPE (olddecl
);
949 tree p1
= TYPE_ARG_TYPES (f1
);
950 tree p2
= TYPE_ARG_TYPES (f2
);
953 /* Specializations of different templates are different functions
954 even if they have the same type. */
955 tree t1
= (DECL_USE_TEMPLATE (newdecl
)
956 ? DECL_TI_TEMPLATE (newdecl
)
958 tree t2
= (DECL_USE_TEMPLATE (olddecl
)
959 ? DECL_TI_TEMPLATE (olddecl
)
964 if (CP_DECL_CONTEXT (newdecl
) != CP_DECL_CONTEXT (olddecl
)
965 && ! (DECL_EXTERN_C_P (newdecl
)
966 && DECL_EXTERN_C_P (olddecl
)))
969 /* A new declaration doesn't match a built-in one unless it
970 is also extern "C". */
971 if (DECL_IS_BUILTIN (olddecl
)
972 && DECL_EXTERN_C_P (olddecl
) && !DECL_EXTERN_C_P (newdecl
))
975 if (TREE_CODE (f1
) != TREE_CODE (f2
))
978 /* A declaration with deduced return type should use its pre-deduction
979 type for declaration matching. */
980 r2
= fndecl_declared_return_type (olddecl
);
982 if (same_type_p (TREE_TYPE (f1
), r2
))
984 if (!prototype_p (f2
) && DECL_EXTERN_C_P (olddecl
)
985 && fndecl_built_in_p (olddecl
))
987 types_match
= self_promoting_args_p (p1
);
988 if (p1
== void_list_node
)
989 TREE_TYPE (newdecl
) = TREE_TYPE (olddecl
);
994 && type_memfn_rqual (f1
) == type_memfn_rqual (f2
)
995 && (TYPE_ATTRIBUTES (TREE_TYPE (newdecl
)) == NULL_TREE
996 || comp_type_attributes (TREE_TYPE (newdecl
),
997 TREE_TYPE (olddecl
)) != 0);
1002 /* The decls dont match if they correspond to two different versions
1003 of the same function. Disallow extern "C" functions to be
1004 versions for now. */
1006 && !DECL_EXTERN_C_P (newdecl
)
1007 && !DECL_EXTERN_C_P (olddecl
)
1009 && maybe_version_functions (newdecl
, olddecl
,
1010 (!DECL_FUNCTION_VERSIONED (newdecl
)
1011 || !DECL_FUNCTION_VERSIONED (olddecl
))))
1014 else if (TREE_CODE (newdecl
) == TEMPLATE_DECL
)
1016 tree oldres
= DECL_TEMPLATE_RESULT (olddecl
);
1017 tree newres
= DECL_TEMPLATE_RESULT (newdecl
);
1019 if (TREE_CODE (newres
) != TREE_CODE (oldres
))
1022 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl
),
1023 DECL_TEMPLATE_PARMS (olddecl
)))
1026 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) == TYPE_DECL
)
1027 types_match
= (same_type_p (TREE_TYPE (oldres
), TREE_TYPE (newres
))
1028 && equivalently_constrained (olddecl
, newdecl
));
1030 // We don't need to check equivalently_constrained for variable and
1031 // function templates because we check it on the results.
1032 types_match
= decls_match (oldres
, newres
);
1036 /* Need to check scope for variable declaration (VAR_DECL).
1037 For typedef (TYPE_DECL), scope is ignored. */
1039 && CP_DECL_CONTEXT (newdecl
) != CP_DECL_CONTEXT (olddecl
)
1041 Two declarations for an object with C language linkage
1042 with the same name (ignoring the namespace that qualify
1043 it) that appear in different namespace scopes refer to
1045 && !(DECL_EXTERN_C_P (olddecl
) && DECL_EXTERN_C_P (newdecl
)))
1048 if (TREE_TYPE (newdecl
) == error_mark_node
)
1049 types_match
= TREE_TYPE (olddecl
) == error_mark_node
;
1050 else if (TREE_TYPE (olddecl
) == NULL_TREE
)
1051 types_match
= TREE_TYPE (newdecl
) == NULL_TREE
;
1052 else if (TREE_TYPE (newdecl
) == NULL_TREE
)
1055 types_match
= comptypes (TREE_TYPE (newdecl
),
1056 TREE_TYPE (olddecl
),
1057 COMPARE_REDECLARATION
);
1060 // Normal functions can be constrained, as can variable partial
1062 if (types_match
&& VAR_OR_FUNCTION_DECL_P (newdecl
))
1063 types_match
= equivalently_constrained (newdecl
, olddecl
);
1068 /* NEWDECL and OLDDECL have identical signatures. If they are
1069 different versions adjust them and return true.
1070 If RECORD is set to true, record function versions. */
1073 maybe_version_functions (tree newdecl
, tree olddecl
, bool record
)
1075 if (!targetm
.target_option
.function_versions (newdecl
, olddecl
))
1078 if (!DECL_FUNCTION_VERSIONED (olddecl
))
1080 DECL_FUNCTION_VERSIONED (olddecl
) = 1;
1081 if (DECL_ASSEMBLER_NAME_SET_P (olddecl
))
1082 mangle_decl (olddecl
);
1085 if (!DECL_FUNCTION_VERSIONED (newdecl
))
1087 DECL_FUNCTION_VERSIONED (newdecl
) = 1;
1088 if (DECL_ASSEMBLER_NAME_SET_P (newdecl
))
1089 mangle_decl (newdecl
);
1093 cgraph_node::record_function_versions (olddecl
, newdecl
);
1098 /* If NEWDECL is `static' and an `extern' was seen previously,
1099 warn about it. OLDDECL is the previous declaration.
1101 Note that this does not apply to the C++ case of declaring
1102 a variable `extern const' and then later `const'.
1104 Don't complain about built-in functions, since they are beyond
1105 the user's control. */
1108 warn_extern_redeclared_static (tree newdecl
, tree olddecl
)
1110 if (TREE_CODE (newdecl
) == TYPE_DECL
1111 || TREE_CODE (newdecl
) == TEMPLATE_DECL
1112 || TREE_CODE (newdecl
) == CONST_DECL
1113 || TREE_CODE (newdecl
) == NAMESPACE_DECL
)
1116 /* Don't get confused by static member functions; that's a different
1118 if (TREE_CODE (newdecl
) == FUNCTION_DECL
1119 && DECL_STATIC_FUNCTION_P (newdecl
))
1122 /* If the old declaration was `static', or the new one isn't, then
1123 everything is OK. */
1124 if (DECL_THIS_STATIC (olddecl
) || !DECL_THIS_STATIC (newdecl
))
1127 /* It's OK to declare a builtin function as `static'. */
1128 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1129 && DECL_ARTIFICIAL (olddecl
))
1132 auto_diagnostic_group d
;
1133 if (permerror (DECL_SOURCE_LOCATION (newdecl
),
1134 "%qD was declared %<extern%> and later %<static%>", newdecl
))
1135 inform (DECL_SOURCE_LOCATION (olddecl
),
1136 "previous declaration of %qD", olddecl
);
1139 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1140 function templates. If their exception specifications do not
1141 match, issue a diagnostic. */
1144 check_redeclaration_exception_specification (tree new_decl
,
1147 tree new_exceptions
= TYPE_RAISES_EXCEPTIONS (TREE_TYPE (new_decl
));
1148 tree old_exceptions
= TYPE_RAISES_EXCEPTIONS (TREE_TYPE (old_decl
));
1150 /* Two default specs are equivalent, don't force evaluation. */
1151 if (UNEVALUATED_NOEXCEPT_SPEC_P (new_exceptions
)
1152 && UNEVALUATED_NOEXCEPT_SPEC_P (old_exceptions
))
1155 if (!type_dependent_expression_p (old_decl
))
1157 maybe_instantiate_noexcept (new_decl
);
1158 maybe_instantiate_noexcept (old_decl
);
1160 new_exceptions
= TYPE_RAISES_EXCEPTIONS (TREE_TYPE (new_decl
));
1161 old_exceptions
= TYPE_RAISES_EXCEPTIONS (TREE_TYPE (old_decl
));
1165 If any declaration of a function has an exception-specification,
1166 all declarations, including the definition and an explicit
1167 specialization, of that function shall have an
1168 exception-specification with the same set of type-ids. */
1169 if (! DECL_IS_BUILTIN (old_decl
)
1170 && !comp_except_specs (new_exceptions
, old_exceptions
, ce_normal
))
1172 const char *const msg
1173 = G_("declaration of %qF has a different exception specifier");
1174 bool complained
= true;
1175 location_t new_loc
= DECL_SOURCE_LOCATION (new_decl
);
1176 auto_diagnostic_group d
;
1177 if (DECL_IN_SYSTEM_HEADER (old_decl
))
1178 complained
= pedwarn (new_loc
, OPT_Wsystem_headers
, msg
, new_decl
);
1179 else if (!flag_exceptions
)
1180 /* We used to silently permit mismatched eh specs with
1181 -fno-exceptions, so make them a pedwarn now. */
1182 complained
= pedwarn (new_loc
, OPT_Wpedantic
, msg
, new_decl
);
1184 error_at (new_loc
, msg
, new_decl
);
1186 inform (DECL_SOURCE_LOCATION (old_decl
),
1187 "from previous declaration %qF", old_decl
);
1191 /* Return true if OLD_DECL and NEW_DECL agree on constexprness.
1192 Otherwise issue diagnostics. */
1195 validate_constexpr_redeclaration (tree old_decl
, tree new_decl
)
1197 old_decl
= STRIP_TEMPLATE (old_decl
);
1198 new_decl
= STRIP_TEMPLATE (new_decl
);
1199 if (!VAR_OR_FUNCTION_DECL_P (old_decl
)
1200 || !VAR_OR_FUNCTION_DECL_P (new_decl
))
1202 if (DECL_DECLARED_CONSTEXPR_P (old_decl
)
1203 == DECL_DECLARED_CONSTEXPR_P (new_decl
))
1205 if (TREE_CODE (old_decl
) == FUNCTION_DECL
)
1207 if (fndecl_built_in_p (old_decl
))
1209 /* Hide a built-in declaration. */
1210 DECL_DECLARED_CONSTEXPR_P (old_decl
)
1211 = DECL_DECLARED_CONSTEXPR_P (new_decl
);
1214 /* 7.1.5 [dcl.constexpr]
1215 Note: An explicit specialization can differ from the template
1216 declaration with respect to the constexpr specifier. */
1217 if (! DECL_TEMPLATE_SPECIALIZATION (old_decl
)
1218 && DECL_TEMPLATE_SPECIALIZATION (new_decl
))
1221 error_at (DECL_SOURCE_LOCATION (new_decl
),
1222 "redeclaration %qD differs in %<constexpr%> "
1223 "from previous declaration", new_decl
);
1224 inform (DECL_SOURCE_LOCATION (old_decl
),
1225 "previous declaration %qD", old_decl
);
1231 // If OLDDECL and NEWDECL are concept declarations with the same type
1232 // (i.e., and template parameters), but different requirements,
1233 // emit diagnostics and return true. Otherwise, return false.
1235 check_concept_refinement (tree olddecl
, tree newdecl
)
1237 if (!DECL_DECLARED_CONCEPT_P (olddecl
) || !DECL_DECLARED_CONCEPT_P (newdecl
))
1240 tree d1
= DECL_TEMPLATE_RESULT (olddecl
);
1241 tree d2
= DECL_TEMPLATE_RESULT (newdecl
);
1242 if (TREE_CODE (d1
) != TREE_CODE (d2
))
1245 tree t1
= TREE_TYPE (d1
);
1246 tree t2
= TREE_TYPE (d2
);
1247 if (TREE_CODE (d1
) == FUNCTION_DECL
)
1249 if (compparms (TYPE_ARG_TYPES (t1
), TYPE_ARG_TYPES (t2
))
1250 && comp_template_parms (DECL_TEMPLATE_PARMS (olddecl
),
1251 DECL_TEMPLATE_PARMS (newdecl
))
1252 && !equivalently_constrained (olddecl
, newdecl
))
1254 error ("cannot specialize concept %q#D", olddecl
);
1261 /* DECL is a redeclaration of a function or function template. If
1262 it does have default arguments issue a diagnostic. Note: this
1263 function is used to enforce the requirements in C++11 8.3.6 about
1264 no default arguments in redeclarations. */
1267 check_redeclaration_no_default_args (tree decl
)
1269 gcc_assert (DECL_DECLARES_FUNCTION_P (decl
));
1271 for (tree t
= FUNCTION_FIRST_USER_PARMTYPE (decl
);
1272 t
&& t
!= void_list_node
; t
= TREE_CHAIN (t
))
1273 if (TREE_PURPOSE (t
))
1275 permerror (DECL_SOURCE_LOCATION (decl
),
1276 "redeclaration of %q#D may not have default "
1282 /* NEWDECL is a redeclaration of a function or function template OLDDECL,
1283 in any case represented as FUNCTION_DECLs (the DECL_TEMPLATE_RESULTs of
1284 the TEMPLATE_DECLs in case of function templates). This function is used
1285 to enforce the final part of C++17 11.3.6/4, about a single declaration:
1286 "If a friend declaration specifies a default argument expression, that
1287 declaration shall be a definition and shall be the only declaration of
1288 the function or function template in the translation unit." */
1291 check_no_redeclaration_friend_default_args (tree olddecl
, tree newdecl
,
1292 bool olddecl_hidden_friend_p
)
1294 if (!olddecl_hidden_friend_p
&& !DECL_FRIEND_P (newdecl
))
1297 tree t1
= FUNCTION_FIRST_USER_PARMTYPE (olddecl
);
1298 tree t2
= FUNCTION_FIRST_USER_PARMTYPE (newdecl
);
1300 for (; t1
&& t1
!= void_list_node
;
1301 t1
= TREE_CHAIN (t1
), t2
= TREE_CHAIN (t2
))
1302 if ((olddecl_hidden_friend_p
&& TREE_PURPOSE (t1
))
1303 || (DECL_FRIEND_P (newdecl
) && TREE_PURPOSE (t2
)))
1305 auto_diagnostic_group d
;
1306 if (permerror (DECL_SOURCE_LOCATION (newdecl
),
1307 "friend declaration of %q#D specifies default "
1308 "arguments and isn't the only declaration", newdecl
))
1309 inform (DECL_SOURCE_LOCATION (olddecl
),
1310 "previous declaration of %q#D", olddecl
);
1315 /* Merge tree bits that correspond to attributes noreturn, nothrow,
1316 const, malloc, and pure from NEWDECL with those of OLDDECL. */
1319 merge_attribute_bits (tree newdecl
, tree olddecl
)
1321 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
1322 TREE_THIS_VOLATILE (olddecl
) |= TREE_THIS_VOLATILE (newdecl
);
1323 TREE_NOTHROW (newdecl
) |= TREE_NOTHROW (olddecl
);
1324 TREE_NOTHROW (olddecl
) |= TREE_NOTHROW (newdecl
);
1325 TREE_READONLY (newdecl
) |= TREE_READONLY (olddecl
);
1326 TREE_READONLY (olddecl
) |= TREE_READONLY (newdecl
);
1327 DECL_IS_MALLOC (newdecl
) |= DECL_IS_MALLOC (olddecl
);
1328 DECL_IS_MALLOC (olddecl
) |= DECL_IS_MALLOC (newdecl
);
1329 DECL_PURE_P (newdecl
) |= DECL_PURE_P (olddecl
);
1330 DECL_PURE_P (olddecl
) |= DECL_PURE_P (newdecl
);
1331 DECL_UNINLINABLE (newdecl
) |= DECL_UNINLINABLE (olddecl
);
1332 DECL_UNINLINABLE (olddecl
) |= DECL_UNINLINABLE (newdecl
);
1335 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1336 && lookup_attribute ("gnu_inline", \
1337 DECL_ATTRIBUTES (fn)))
1339 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1340 If the redeclaration is invalid, a diagnostic is issued, and the
1341 error_mark_node is returned. Otherwise, OLDDECL is returned.
1343 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1346 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1349 duplicate_decls (tree newdecl
, tree olddecl
, bool newdecl_is_friend
)
1351 unsigned olddecl_uid
= DECL_UID (olddecl
);
1352 int olddecl_friend
= 0, types_match
= 0, hidden_friend
= 0;
1353 int olddecl_hidden_friend
= 0;
1354 int new_defines_function
= 0;
1355 tree new_template_info
;
1356 location_t olddecl_loc
= DECL_SOURCE_LOCATION (olddecl
);
1357 location_t newdecl_loc
= DECL_SOURCE_LOCATION (newdecl
);
1359 if (newdecl
== olddecl
)
1362 types_match
= decls_match (newdecl
, olddecl
);
1364 /* If either the type of the new decl or the type of the old decl is an
1365 error_mark_node, then that implies that we have already issued an
1366 error (earlier) for some bogus type specification, and in that case,
1367 it is rather pointless to harass the user with yet more error message
1368 about the same declaration, so just pretend the types match here. */
1369 if (TREE_TYPE (newdecl
) == error_mark_node
1370 || TREE_TYPE (olddecl
) == error_mark_node
)
1371 return error_mark_node
;
1373 /* Check for redeclaration and other discrepancies. */
1374 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1375 && DECL_ARTIFICIAL (olddecl
))
1377 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl
));
1378 if (TREE_CODE (newdecl
) != FUNCTION_DECL
)
1380 /* Avoid warnings redeclaring built-ins which have not been
1381 explicitly declared. */
1382 if (DECL_ANTICIPATED (olddecl
))
1384 if (TREE_PUBLIC (newdecl
)
1385 && CP_DECL_CONTEXT (newdecl
) == global_namespace
)
1386 warning_at (newdecl_loc
,
1387 OPT_Wbuiltin_declaration_mismatch
,
1388 "built-in function %qD declared as non-function",
1393 /* If you declare a built-in or predefined function name as static,
1394 the old definition is overridden, but optionally warn this was a
1395 bad choice of name. */
1396 if (! TREE_PUBLIC (newdecl
))
1398 warning_at (newdecl_loc
,
1400 fndecl_built_in_p (olddecl
)
1401 ? G_("shadowing built-in function %q#D")
1402 : G_("shadowing library function %q#D"), olddecl
);
1403 /* Discard the old built-in function. */
1406 /* If the built-in is not ansi, then programs can override
1407 it even globally without an error. */
1408 else if (! fndecl_built_in_p (olddecl
))
1409 warning_at (newdecl_loc
, 0,
1410 "library function %q#D redeclared as non-function %q#D",
1413 error_at (newdecl_loc
,
1414 "declaration of %q#D conflicts with built-in "
1415 "declaration %q#D", newdecl
, olddecl
);
1418 else if (DECL_OMP_DECLARE_REDUCTION_P (olddecl
))
1420 gcc_assert (DECL_OMP_DECLARE_REDUCTION_P (newdecl
));
1421 error_at (newdecl_loc
,
1422 "redeclaration of %<pragma omp declare reduction%>");
1423 inform (olddecl_loc
,
1424 "previous %<pragma omp declare reduction%> declaration");
1425 return error_mark_node
;
1427 else if (!types_match
)
1429 /* Avoid warnings redeclaring built-ins which have not been
1430 explicitly declared. */
1431 if (DECL_ANTICIPATED (olddecl
))
1435 /* A new declaration doesn't match a built-in one unless it
1436 is also extern "C". */
1437 gcc_assert (DECL_IS_BUILTIN (olddecl
));
1438 gcc_assert (DECL_EXTERN_C_P (olddecl
));
1439 if (!DECL_EXTERN_C_P (newdecl
))
1442 for (t1
= TYPE_ARG_TYPES (TREE_TYPE (newdecl
)),
1443 t2
= TYPE_ARG_TYPES (TREE_TYPE (olddecl
));
1445 t1
= TREE_CHAIN (t1
), t2
= TREE_CHAIN (t2
))
1449 /* FILE, tm types are not known at the time
1450 we create the builtins. */
1451 for (unsigned i
= 0;
1452 i
< sizeof (builtin_structptr_types
)
1453 / sizeof (builtin_structptr_type
);
1455 if (TREE_VALUE (t2
) == builtin_structptr_types
[i
].node
)
1457 tree t
= TREE_VALUE (t1
);
1460 && TYPE_IDENTIFIER (TREE_TYPE (t
))
1461 == get_identifier (builtin_structptr_types
[i
].str
)
1462 && compparms (TREE_CHAIN (t1
), TREE_CHAIN (t2
)))
1464 tree oldargs
= TYPE_ARG_TYPES (TREE_TYPE (olddecl
));
1466 TYPE_ARG_TYPES (TREE_TYPE (olddecl
))
1467 = TYPE_ARG_TYPES (TREE_TYPE (newdecl
));
1468 types_match
= decls_match (newdecl
, olddecl
);
1470 return duplicate_decls (newdecl
, olddecl
,
1472 TYPE_ARG_TYPES (TREE_TYPE (olddecl
)) = oldargs
;
1477 if (! same_type_p (TREE_VALUE (t1
), TREE_VALUE (t2
)))
1482 warning_at (newdecl_loc
,
1483 OPT_Wbuiltin_declaration_mismatch
,
1484 "declaration of %q#D conflicts with built-in "
1485 "declaration %q#D", newdecl
, olddecl
);
1487 else if ((DECL_EXTERN_C_P (newdecl
)
1488 && DECL_EXTERN_C_P (olddecl
))
1489 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl
)),
1490 TYPE_ARG_TYPES (TREE_TYPE (olddecl
))))
1492 /* Don't really override olddecl for __* prefixed builtins
1493 except for __[^b]*_chk, the compiler might be using those
1495 if (fndecl_built_in_p (olddecl
))
1497 tree id
= DECL_NAME (olddecl
);
1498 const char *name
= IDENTIFIER_POINTER (id
);
1503 && (strncmp (name
+ 2, "builtin_",
1504 strlen ("builtin_")) == 0
1505 || (len
= strlen (name
)) <= strlen ("___chk")
1506 || memcmp (name
+ len
- strlen ("_chk"),
1507 "_chk", strlen ("_chk") + 1) != 0))
1509 if (DECL_INITIAL (newdecl
))
1511 error_at (newdecl_loc
,
1512 "definition of %q#D ambiguates built-in "
1513 "declaration %q#D", newdecl
, olddecl
);
1514 return error_mark_node
;
1516 auto_diagnostic_group d
;
1517 if (permerror (newdecl_loc
,
1518 "new declaration %q#D ambiguates built-in"
1519 " declaration %q#D", newdecl
, olddecl
)
1521 inform (newdecl_loc
,
1522 "ignoring the %q#D declaration", newdecl
);
1523 return flag_permissive
? olddecl
: error_mark_node
;
1527 /* A near match; override the builtin. */
1529 if (TREE_PUBLIC (newdecl
))
1530 warning_at (newdecl_loc
,
1531 OPT_Wbuiltin_declaration_mismatch
,
1532 "new declaration %q#D ambiguates built-in "
1533 "declaration %q#D", newdecl
, olddecl
);
1535 warning (OPT_Wshadow
,
1536 fndecl_built_in_p (olddecl
)
1537 ? G_("shadowing built-in function %q#D")
1538 : G_("shadowing library function %q#D"), olddecl
);
1541 /* Discard the old built-in function. */
1544 /* Replace the old RTL to avoid problems with inlining. */
1545 COPY_DECL_RTL (newdecl
, olddecl
);
1547 /* Even if the types match, prefer the new declarations type for
1548 built-ins which have not been explicitly declared, for
1549 exception lists, etc... */
1550 else if (DECL_IS_BUILTIN (olddecl
))
1552 tree type
= TREE_TYPE (newdecl
);
1553 tree attribs
= (*targetm
.merge_type_attributes
)
1554 (TREE_TYPE (olddecl
), type
);
1556 type
= cp_build_type_attribute_variant (type
, attribs
);
1557 TREE_TYPE (newdecl
) = TREE_TYPE (olddecl
) = type
;
1560 /* If a function is explicitly declared "throw ()", propagate that to
1561 the corresponding builtin. */
1562 if (DECL_BUILT_IN_CLASS (olddecl
) == BUILT_IN_NORMAL
1563 && DECL_ANTICIPATED (olddecl
)
1564 && TREE_NOTHROW (newdecl
)
1565 && !TREE_NOTHROW (olddecl
))
1567 enum built_in_function fncode
= DECL_FUNCTION_CODE (olddecl
);
1568 tree tmpdecl
= builtin_decl_explicit (fncode
);
1569 if (tmpdecl
&& tmpdecl
!= olddecl
&& types_match
)
1570 TREE_NOTHROW (tmpdecl
) = 1;
1573 /* Whether or not the builtin can throw exceptions has no
1574 bearing on this declarator. */
1575 TREE_NOTHROW (olddecl
) = 0;
1577 if (DECL_THIS_STATIC (newdecl
) && !DECL_THIS_STATIC (olddecl
))
1579 /* If a builtin function is redeclared as `static', merge
1580 the declarations, but make the original one static. */
1581 DECL_THIS_STATIC (olddecl
) = 1;
1582 TREE_PUBLIC (olddecl
) = 0;
1584 /* Make the old declaration consistent with the new one so
1585 that all remnants of the builtin-ness of this function
1586 will be banished. */
1587 SET_DECL_LANGUAGE (olddecl
, DECL_LANGUAGE (newdecl
));
1588 COPY_DECL_RTL (newdecl
, olddecl
);
1591 else if (TREE_CODE (olddecl
) != TREE_CODE (newdecl
))
1593 /* C++ Standard, 3.3, clause 4:
1594 "[Note: a namespace name or a class template name must be unique
1595 in its declarative region (7.3.2, clause 14). ]" */
1596 if (TREE_CODE (olddecl
) == NAMESPACE_DECL
1597 || TREE_CODE (newdecl
) == NAMESPACE_DECL
)
1598 /* Namespace conflicts with not namespace. */;
1599 else if (DECL_TYPE_TEMPLATE_P (olddecl
)
1600 || DECL_TYPE_TEMPLATE_P (newdecl
))
1601 /* Class template conflicts. */;
1602 else if ((TREE_CODE (newdecl
) == FUNCTION_DECL
1603 && DECL_FUNCTION_TEMPLATE_P (olddecl
))
1604 || (TREE_CODE (olddecl
) == FUNCTION_DECL
1605 && DECL_FUNCTION_TEMPLATE_P (newdecl
)))
1607 /* One is a function and the other is a template
1609 if (!UDLIT_OPER_P (DECL_NAME (newdecl
)))
1612 /* There can only be one! */
1613 if (TREE_CODE (newdecl
) == TEMPLATE_DECL
1614 && check_raw_literal_operator (olddecl
))
1615 error_at (newdecl_loc
,
1616 "literal operator %q#D conflicts with"
1617 " raw literal operator", newdecl
);
1618 else if (check_raw_literal_operator (newdecl
))
1619 error_at (newdecl_loc
,
1620 "raw literal operator %q#D conflicts with"
1621 " literal operator template", newdecl
);
1625 inform (olddecl_loc
, "previous declaration %q#D", olddecl
);
1626 return error_mark_node
;
1628 else if (DECL_IMPLICIT_TYPEDEF_P (olddecl
)
1629 || DECL_IMPLICIT_TYPEDEF_P (newdecl
))
1630 /* One is an implicit typedef, that's ok. */
1633 error ("%q#D redeclared as different kind of entity", newdecl
);
1634 inform (olddecl_loc
, "previous declaration %q#D", olddecl
);
1636 return error_mark_node
;
1638 else if (!types_match
)
1640 if (CP_DECL_CONTEXT (newdecl
) != CP_DECL_CONTEXT (olddecl
))
1641 /* These are certainly not duplicate declarations; they're
1642 from different scopes. */
1645 if (TREE_CODE (newdecl
) == TEMPLATE_DECL
)
1647 /* The name of a class template may not be declared to refer to
1648 any other template, class, function, object, namespace, value,
1649 or type in the same scope. */
1650 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl
)) == TYPE_DECL
1651 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) == TYPE_DECL
)
1653 error_at (newdecl_loc
,
1654 "conflicting declaration of template %q#D", newdecl
);
1655 inform (olddecl_loc
,
1656 "previous declaration %q#D", olddecl
);
1657 return error_mark_node
;
1659 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl
)) == FUNCTION_DECL
1660 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) == FUNCTION_DECL
1661 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl
))),
1662 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl
))))
1663 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl
),
1664 DECL_TEMPLATE_PARMS (olddecl
))
1665 /* Template functions can be disambiguated by
1667 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl
)),
1668 TREE_TYPE (TREE_TYPE (olddecl
)))
1669 /* Template functions can also be disambiguated by
1671 && equivalently_constrained (olddecl
, newdecl
))
1673 error_at (newdecl_loc
, "ambiguating new declaration %q#D",
1675 inform (olddecl_loc
,
1676 "old declaration %q#D", olddecl
);
1678 else if (check_concept_refinement (olddecl
, newdecl
))
1679 return error_mark_node
;
1682 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1684 if (DECL_EXTERN_C_P (newdecl
) && DECL_EXTERN_C_P (olddecl
))
1686 error_at (newdecl_loc
,
1687 "conflicting declaration of C function %q#D",
1689 inform (olddecl_loc
,
1690 "previous declaration %q#D", olddecl
);
1693 /* For function versions, params and types match, but they
1694 are not ambiguous. */
1695 else if ((!DECL_FUNCTION_VERSIONED (newdecl
)
1696 && !DECL_FUNCTION_VERSIONED (olddecl
))
1697 // The functions have the same parameter types.
1698 && compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl
)),
1699 TYPE_ARG_TYPES (TREE_TYPE (olddecl
)))
1700 // And the same constraints.
1701 && equivalently_constrained (newdecl
, olddecl
))
1703 error_at (newdecl_loc
,
1704 "ambiguating new declaration of %q#D", newdecl
);
1705 inform (olddecl_loc
,
1706 "old declaration %q#D", olddecl
);
1707 return error_mark_node
;
1714 error_at (newdecl_loc
, "conflicting declaration %q#D", newdecl
);
1715 inform (olddecl_loc
,
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 auto_diagnostic_group d
;
1771 error_at (newdecl_loc
, errmsg
, newdecl
);
1772 if (DECL_NAME (olddecl
) != NULL_TREE
)
1773 inform (olddecl_loc
,
1774 (DECL_INITIAL (olddecl
) && namespace_bindings_p ())
1775 ? G_("%q#D previously defined here")
1776 : G_("%q#D previously declared here"), olddecl
);
1777 return error_mark_node
;
1779 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1780 && DECL_INITIAL (olddecl
) != NULL_TREE
1781 && !prototype_p (TREE_TYPE (olddecl
))
1782 && prototype_p (TREE_TYPE (newdecl
)))
1784 /* Prototype decl follows defn w/o prototype. */
1785 auto_diagnostic_group d
;
1786 if (warning_at (newdecl_loc
, 0,
1787 "prototype specified for %q#D", newdecl
))
1788 inform (olddecl_loc
,
1789 "previous non-prototype definition here");
1791 else if (VAR_OR_FUNCTION_DECL_P (olddecl
)
1792 && DECL_LANGUAGE (newdecl
) != DECL_LANGUAGE (olddecl
))
1795 If two declarations of the same function or object
1796 specify different linkage-specifications ..., the program
1797 is ill-formed.... Except for functions with C++ linkage,
1798 a function declaration without a linkage specification
1799 shall not precede the first linkage specification for
1800 that function. A function can be declared without a
1801 linkage specification after an explicit linkage
1802 specification has been seen; the linkage explicitly
1803 specified in the earlier declaration is not affected by
1804 such a function declaration.
1806 DR 563 raises the question why the restrictions on
1807 functions should not also apply to objects. Older
1808 versions of G++ silently ignore the linkage-specification
1816 which is clearly wrong. Therefore, we now treat objects
1818 if (current_lang_depth () == 0)
1820 /* There is no explicit linkage-specification, so we use
1821 the linkage from the previous declaration. */
1822 retrofit_lang_decl (newdecl
);
1823 SET_DECL_LANGUAGE (newdecl
, DECL_LANGUAGE (olddecl
));
1827 auto_diagnostic_group d
;
1828 error_at (newdecl_loc
,
1829 "conflicting declaration of %q#D with %qL linkage",
1830 newdecl
, DECL_LANGUAGE (newdecl
));
1831 inform (olddecl_loc
,
1832 "previous declaration with %qL linkage",
1833 DECL_LANGUAGE (olddecl
));
1837 if (DECL_LANG_SPECIFIC (olddecl
) && DECL_USE_TEMPLATE (olddecl
))
1839 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
1841 /* Note: free functions, as TEMPLATE_DECLs, are handled below. */
1842 if (DECL_FUNCTION_MEMBER_P (olddecl
)
1843 && (/* grokfndecl passes member function templates too
1844 as FUNCTION_DECLs. */
1845 DECL_TEMPLATE_INFO (olddecl
)
1847 Default arguments for a member function of a class
1848 template shall be specified on the initial declaration
1849 of the member function within the class template. */
1850 || CLASSTYPE_TEMPLATE_INFO (CP_DECL_CONTEXT (olddecl
))))
1851 check_redeclaration_no_default_args (newdecl
);
1854 tree t1
= FUNCTION_FIRST_USER_PARMTYPE (olddecl
);
1855 tree t2
= FUNCTION_FIRST_USER_PARMTYPE (newdecl
);
1858 for (; t1
&& t1
!= void_list_node
;
1859 t1
= TREE_CHAIN (t1
), t2
= TREE_CHAIN (t2
), i
++)
1860 if (TREE_PURPOSE (t1
) && TREE_PURPOSE (t2
))
1862 if (simple_cst_equal (TREE_PURPOSE (t1
),
1863 TREE_PURPOSE (t2
)) == 1)
1865 auto_diagnostic_group d
;
1866 if (permerror (newdecl_loc
,
1867 "default argument given for parameter "
1868 "%d of %q#D", i
, newdecl
))
1869 inform (olddecl_loc
,
1870 "previous specification in %q#D here",
1875 auto_diagnostic_group d
;
1876 error_at (newdecl_loc
,
1877 "default argument given for parameter %d "
1878 "of %q#D", i
, newdecl
);
1879 inform (olddecl_loc
,
1880 "previous specification in %q#D here",
1885 /* C++17 11.3.6/4: "If a friend declaration specifies a default
1886 argument expression, that declaration... shall be the only
1887 declaration of the function or function template in the
1888 translation unit." */
1889 check_no_redeclaration_friend_default_args
1890 (olddecl
, newdecl
, DECL_HIDDEN_FRIEND_P (olddecl
));
1895 /* Do not merge an implicit typedef with an explicit one. In:
1899 typedef class A A __attribute__ ((foo));
1901 the attribute should apply only to the typedef. */
1902 if (TREE_CODE (olddecl
) == TYPE_DECL
1903 && (DECL_IMPLICIT_TYPEDEF_P (olddecl
)
1904 || DECL_IMPLICIT_TYPEDEF_P (newdecl
)))
1907 if (!validate_constexpr_redeclaration (olddecl
, newdecl
))
1908 return error_mark_node
;
1910 /* We have committed to returning OLDDECL at this point. */
1912 /* If new decl is `static' and an `extern' was seen previously,
1914 warn_extern_redeclared_static (newdecl
, olddecl
);
1916 /* True to merge attributes between the declarations, false to
1917 set OLDDECL's attributes to those of NEWDECL (for template
1918 explicit specializations that specify their own attributes
1919 independent of those specified for the primary template). */
1920 const bool merge_attr
= (TREE_CODE (newdecl
) != FUNCTION_DECL
1921 || !DECL_TEMPLATE_SPECIALIZATION (newdecl
)
1922 || DECL_TEMPLATE_SPECIALIZATION (olddecl
));
1924 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1926 if (merge_attr
&& diagnose_mismatched_attributes (olddecl
, newdecl
))
1927 inform (olddecl_loc
, DECL_INITIAL (olddecl
)
1928 ? G_("previous definition of %qD here")
1929 : G_("previous declaration of %qD here"), olddecl
);
1931 /* Now that functions must hold information normally held
1932 by field decls, there is extra work to do so that
1933 declaration information does not get destroyed during
1935 if (DECL_VINDEX (olddecl
))
1936 DECL_VINDEX (newdecl
) = DECL_VINDEX (olddecl
);
1937 if (DECL_CONTEXT (olddecl
))
1938 DECL_CONTEXT (newdecl
) = DECL_CONTEXT (olddecl
);
1939 DECL_STATIC_CONSTRUCTOR (newdecl
) |= DECL_STATIC_CONSTRUCTOR (olddecl
);
1940 DECL_STATIC_DESTRUCTOR (newdecl
) |= DECL_STATIC_DESTRUCTOR (olddecl
);
1941 DECL_PURE_VIRTUAL_P (newdecl
) |= DECL_PURE_VIRTUAL_P (olddecl
);
1942 DECL_VIRTUAL_P (newdecl
) |= DECL_VIRTUAL_P (olddecl
);
1943 DECL_INVALID_OVERRIDER_P (newdecl
) |= DECL_INVALID_OVERRIDER_P (olddecl
);
1944 DECL_FINAL_P (newdecl
) |= DECL_FINAL_P (olddecl
);
1945 DECL_OVERRIDE_P (newdecl
) |= DECL_OVERRIDE_P (olddecl
);
1946 DECL_THIS_STATIC (newdecl
) |= DECL_THIS_STATIC (olddecl
);
1947 if (DECL_OVERLOADED_OPERATOR_P (olddecl
))
1948 DECL_OVERLOADED_OPERATOR_CODE_RAW (newdecl
)
1949 = DECL_OVERLOADED_OPERATOR_CODE_RAW (olddecl
);
1950 new_defines_function
= DECL_INITIAL (newdecl
) != NULL_TREE
;
1952 /* Optionally warn about more than one declaration for the same
1953 name, but don't warn about a function declaration followed by a
1955 if (warn_redundant_decls
&& ! DECL_ARTIFICIAL (olddecl
)
1956 && !(new_defines_function
&& DECL_INITIAL (olddecl
) == NULL_TREE
)
1957 /* Don't warn about extern decl followed by definition. */
1958 && !(DECL_EXTERNAL (olddecl
) && ! DECL_EXTERNAL (newdecl
))
1959 /* Don't warn about friends, let add_friend take care of it. */
1960 && ! (newdecl_is_friend
|| DECL_FRIEND_P (olddecl
))
1961 /* Don't warn about declaration followed by specialization. */
1962 && (! DECL_TEMPLATE_SPECIALIZATION (newdecl
)
1963 || DECL_TEMPLATE_SPECIALIZATION (olddecl
)))
1965 auto_diagnostic_group d
;
1966 if (warning_at (newdecl_loc
,
1967 OPT_Wredundant_decls
,
1968 "redundant redeclaration of %qD in same scope",
1970 inform (olddecl_loc
,
1971 "previous declaration of %qD", olddecl
);
1974 if (!(DECL_TEMPLATE_INSTANTIATION (olddecl
)
1975 && DECL_TEMPLATE_SPECIALIZATION (newdecl
)))
1977 if (DECL_DELETED_FN (newdecl
))
1979 auto_diagnostic_group d
;
1980 error_at (newdecl_loc
, "deleted definition of %qD", newdecl
);
1981 inform (olddecl_loc
,
1982 "previous declaration of %qD", olddecl
);
1984 DECL_DELETED_FN (newdecl
) |= DECL_DELETED_FN (olddecl
);
1988 /* Deal with C++: must preserve virtual function table size. */
1989 if (TREE_CODE (olddecl
) == TYPE_DECL
)
1991 tree newtype
= TREE_TYPE (newdecl
);
1992 tree oldtype
= TREE_TYPE (olddecl
);
1994 if (newtype
!= error_mark_node
&& oldtype
!= error_mark_node
1995 && TYPE_LANG_SPECIFIC (newtype
) && TYPE_LANG_SPECIFIC (oldtype
))
1996 CLASSTYPE_FRIEND_CLASSES (newtype
)
1997 = CLASSTYPE_FRIEND_CLASSES (oldtype
);
1999 DECL_ORIGINAL_TYPE (newdecl
) = DECL_ORIGINAL_TYPE (olddecl
);
2002 /* Copy all the DECL_... slots specified in the new decl except for
2003 any that we copy here from the old type. */
2005 DECL_ATTRIBUTES (newdecl
)
2006 = (*targetm
.merge_decl_attributes
) (olddecl
, newdecl
);
2008 DECL_ATTRIBUTES (olddecl
) = DECL_ATTRIBUTES (newdecl
);
2010 if (DECL_DECLARES_FUNCTION_P (olddecl
))
2012 olddecl_friend
= DECL_FRIEND_P (olddecl
);
2013 olddecl_hidden_friend
= DECL_HIDDEN_FRIEND_P (olddecl
);
2014 hidden_friend
= (DECL_ANTICIPATED (olddecl
)
2015 && DECL_HIDDEN_FRIEND_P (olddecl
)
2016 && newdecl_is_friend
);
2019 DECL_ANTICIPATED (olddecl
) = 0;
2020 DECL_HIDDEN_FRIEND_P (olddecl
) = 0;
2024 if (TREE_CODE (newdecl
) == TEMPLATE_DECL
)
2026 tree old_result
= DECL_TEMPLATE_RESULT (olddecl
);
2027 tree new_result
= DECL_TEMPLATE_RESULT (newdecl
);
2028 TREE_TYPE (olddecl
) = TREE_TYPE (old_result
);
2029 DECL_TEMPLATE_SPECIALIZATIONS (olddecl
)
2030 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl
),
2031 DECL_TEMPLATE_SPECIALIZATIONS (newdecl
));
2033 DECL_ATTRIBUTES (old_result
)
2034 = (*targetm
.merge_decl_attributes
) (old_result
, new_result
);
2036 if (DECL_FUNCTION_TEMPLATE_P (newdecl
))
2038 if (DECL_SOURCE_LOCATION (newdecl
)
2039 != DECL_SOURCE_LOCATION (olddecl
))
2041 /* Per C++11 8.3.6/4, default arguments cannot be added in
2042 later declarations of a function template. */
2043 check_redeclaration_no_default_args (newdecl
);
2044 /* C++17 11.3.6/4: "If a friend declaration specifies a default
2045 argument expression, that declaration... shall be the only
2046 declaration of the function or function template in the
2047 translation unit." */
2048 check_no_redeclaration_friend_default_args
2049 (old_result
, new_result
, olddecl_hidden_friend
);
2052 check_default_args (newdecl
);
2054 if (GNU_INLINE_P (old_result
) != GNU_INLINE_P (new_result
)
2055 && DECL_INITIAL (new_result
))
2057 if (DECL_INITIAL (old_result
))
2058 DECL_UNINLINABLE (old_result
) = 1;
2060 DECL_UNINLINABLE (old_result
) = DECL_UNINLINABLE (new_result
);
2061 DECL_EXTERNAL (old_result
) = DECL_EXTERNAL (new_result
);
2062 DECL_NOT_REALLY_EXTERN (old_result
)
2063 = DECL_NOT_REALLY_EXTERN (new_result
);
2064 DECL_INTERFACE_KNOWN (old_result
)
2065 = DECL_INTERFACE_KNOWN (new_result
);
2066 DECL_DECLARED_INLINE_P (old_result
)
2067 = DECL_DECLARED_INLINE_P (new_result
);
2068 DECL_DISREGARD_INLINE_LIMITS (old_result
)
2069 |= DECL_DISREGARD_INLINE_LIMITS (new_result
);
2074 DECL_DECLARED_INLINE_P (old_result
)
2075 |= DECL_DECLARED_INLINE_P (new_result
);
2076 DECL_DISREGARD_INLINE_LIMITS (old_result
)
2077 |= DECL_DISREGARD_INLINE_LIMITS (new_result
);
2078 check_redeclaration_exception_specification (newdecl
, olddecl
);
2080 merge_attribute_bits (new_result
, old_result
);
2084 /* If the new declaration is a definition, update the file and
2085 line information on the declaration, and also make
2086 the old declaration the same definition. */
2087 if (DECL_INITIAL (new_result
) != NULL_TREE
)
2089 DECL_SOURCE_LOCATION (olddecl
)
2090 = DECL_SOURCE_LOCATION (old_result
)
2091 = DECL_SOURCE_LOCATION (newdecl
);
2092 DECL_INITIAL (old_result
) = DECL_INITIAL (new_result
);
2093 if (DECL_FUNCTION_TEMPLATE_P (newdecl
))
2096 DECL_ARGUMENTS (old_result
)
2097 = DECL_ARGUMENTS (new_result
);
2098 for (parm
= DECL_ARGUMENTS (old_result
); parm
;
2099 parm
= DECL_CHAIN (parm
))
2100 DECL_CONTEXT (parm
) = old_result
;
2109 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2110 check_redeclaration_exception_specification (newdecl
, olddecl
);
2112 /* Automatically handles default parameters. */
2113 tree oldtype
= TREE_TYPE (olddecl
);
2116 /* For typedefs use the old type, as the new type's DECL_NAME points
2117 at newdecl, which will be ggc_freed. */
2118 if (TREE_CODE (newdecl
) == TYPE_DECL
)
2120 /* But NEWTYPE might have an attribute, honor that. */
2121 tree tem
= TREE_TYPE (newdecl
);
2124 if (TYPE_USER_ALIGN (tem
))
2126 if (TYPE_ALIGN (tem
) > TYPE_ALIGN (newtype
))
2127 SET_TYPE_ALIGN (newtype
, TYPE_ALIGN (tem
));
2128 TYPE_USER_ALIGN (newtype
) = true;
2131 /* And remove the new type from the variants list. */
2132 if (TYPE_NAME (TREE_TYPE (newdecl
)) == newdecl
)
2134 tree remove
= TREE_TYPE (newdecl
);
2135 for (tree t
= TYPE_MAIN_VARIANT (remove
); ;
2136 t
= TYPE_NEXT_VARIANT (t
))
2137 if (TYPE_NEXT_VARIANT (t
) == remove
)
2139 TYPE_NEXT_VARIANT (t
) = TYPE_NEXT_VARIANT (remove
);
2144 else if (merge_attr
)
2145 newtype
= merge_types (TREE_TYPE (newdecl
), TREE_TYPE (olddecl
));
2147 newtype
= TREE_TYPE (newdecl
);
2149 if (VAR_P (newdecl
))
2151 DECL_THIS_EXTERN (newdecl
) |= DECL_THIS_EXTERN (olddecl
);
2152 /* For already initialized vars, TREE_READONLY could have been
2153 cleared in cp_finish_decl, because the var needs runtime
2154 initialization or destruction. Make sure not to set
2155 TREE_READONLY on it again. */
2156 if (DECL_INITIALIZED_P (olddecl
)
2157 && !DECL_EXTERNAL (olddecl
)
2158 && !TREE_READONLY (olddecl
))
2159 TREE_READONLY (newdecl
) = 0;
2160 DECL_INITIALIZED_P (newdecl
) |= DECL_INITIALIZED_P (olddecl
);
2161 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl
)
2162 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl
);
2163 if (DECL_DEPENDENT_INIT_P (olddecl
))
2164 SET_DECL_DEPENDENT_INIT_P (newdecl
, true);
2165 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl
)
2166 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl
);
2167 if (DECL_CLASS_SCOPE_P (olddecl
))
2168 DECL_DECLARED_CONSTEXPR_P (newdecl
)
2169 |= DECL_DECLARED_CONSTEXPR_P (olddecl
);
2171 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
2172 if (DECL_LANG_SPECIFIC (olddecl
)
2173 && CP_DECL_THREADPRIVATE_P (olddecl
))
2175 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
2176 retrofit_lang_decl (newdecl
);
2177 CP_DECL_THREADPRIVATE_P (newdecl
) = 1;
2181 /* An explicit specialization of a function template or of a member
2182 function of a class template can be declared transaction_safe
2183 independently of whether the corresponding template entity is declared
2184 transaction_safe. */
2185 if (flag_tm
&& TREE_CODE (newdecl
) == FUNCTION_DECL
2186 && DECL_TEMPLATE_INSTANTIATION (olddecl
)
2187 && DECL_TEMPLATE_SPECIALIZATION (newdecl
)
2188 && tx_safe_fn_type_p (newtype
)
2189 && !tx_safe_fn_type_p (TREE_TYPE (newdecl
)))
2190 newtype
= tx_unsafe_fn_variant (newtype
);
2192 TREE_TYPE (newdecl
) = TREE_TYPE (olddecl
) = newtype
;
2194 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2195 check_default_args (newdecl
);
2197 /* Lay the type out, unless already done. */
2198 if (! same_type_p (newtype
, oldtype
)
2199 && TREE_TYPE (newdecl
) != error_mark_node
2200 && !(processing_template_decl
&& uses_template_parms (newdecl
)))
2201 layout_type (TREE_TYPE (newdecl
));
2203 if ((VAR_P (newdecl
)
2204 || TREE_CODE (newdecl
) == PARM_DECL
2205 || TREE_CODE (newdecl
) == RESULT_DECL
2206 || TREE_CODE (newdecl
) == FIELD_DECL
2207 || TREE_CODE (newdecl
) == TYPE_DECL
)
2208 && !(processing_template_decl
&& uses_template_parms (newdecl
)))
2209 layout_decl (newdecl
, 0);
2211 /* Merge deprecatedness. */
2212 if (TREE_DEPRECATED (newdecl
))
2213 TREE_DEPRECATED (olddecl
) = 1;
2215 /* Preserve function specific target and optimization options */
2216 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2218 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl
)
2219 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl
))
2220 DECL_FUNCTION_SPECIFIC_TARGET (newdecl
)
2221 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl
);
2223 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
)
2224 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
))
2225 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
)
2226 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
);
2230 /* Merge the const type qualifier. */
2231 if (TREE_READONLY (newdecl
))
2232 TREE_READONLY (olddecl
) = 1;
2233 /* Merge the volatile type qualifier. */
2234 if (TREE_THIS_VOLATILE (newdecl
))
2235 TREE_THIS_VOLATILE (olddecl
) = 1;
2238 /* Merge the initialization information. */
2239 if (DECL_INITIAL (newdecl
) == NULL_TREE
2240 && DECL_INITIAL (olddecl
) != NULL_TREE
)
2242 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
2243 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
2244 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2246 DECL_SAVED_TREE (newdecl
) = DECL_SAVED_TREE (olddecl
);
2247 DECL_STRUCT_FUNCTION (newdecl
) = DECL_STRUCT_FUNCTION (olddecl
);
2251 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2253 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl
)
2254 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl
);
2255 DECL_NO_LIMIT_STACK (newdecl
) |= DECL_NO_LIMIT_STACK (olddecl
);
2256 DECL_IS_OPERATOR_NEW (newdecl
) |= DECL_IS_OPERATOR_NEW (olddecl
);
2257 DECL_LOOPING_CONST_OR_PURE_P (newdecl
)
2258 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl
);
2261 merge_attribute_bits (newdecl
, olddecl
);
2264 /* Merge the noreturn bit. */
2265 TREE_THIS_VOLATILE (olddecl
) = TREE_THIS_VOLATILE (newdecl
);
2266 TREE_READONLY (olddecl
) = TREE_READONLY (newdecl
);
2267 TREE_NOTHROW (olddecl
) = TREE_NOTHROW (newdecl
);
2268 DECL_IS_MALLOC (olddecl
) = DECL_IS_MALLOC (newdecl
);
2269 DECL_PURE_P (olddecl
) = DECL_PURE_P (newdecl
);
2271 /* Keep the old RTL. */
2272 COPY_DECL_RTL (olddecl
, newdecl
);
2274 else if (VAR_P (newdecl
)
2275 && (DECL_SIZE (olddecl
) || !DECL_SIZE (newdecl
)))
2277 /* Keep the old RTL. We cannot keep the old RTL if the old
2278 declaration was for an incomplete object and the new
2279 declaration is not since many attributes of the RTL will
2281 COPY_DECL_RTL (olddecl
, newdecl
);
2284 /* If cannot merge, then use the new type and qualifiers,
2285 and don't preserve the old rtl. */
2288 /* Clean out any memory we had of the old declaration. */
2289 tree oldstatic
= value_member (olddecl
, static_aggregates
);
2291 TREE_VALUE (oldstatic
) = error_mark_node
;
2293 TREE_TYPE (olddecl
) = TREE_TYPE (newdecl
);
2294 TREE_READONLY (olddecl
) = TREE_READONLY (newdecl
);
2295 TREE_THIS_VOLATILE (olddecl
) = TREE_THIS_VOLATILE (newdecl
);
2296 TREE_NOTHROW (olddecl
) = TREE_NOTHROW (newdecl
);
2297 TREE_SIDE_EFFECTS (olddecl
) = TREE_SIDE_EFFECTS (newdecl
);
2300 /* Merge the storage class information. */
2301 merge_weak (newdecl
, olddecl
);
2303 DECL_DEFER_OUTPUT (newdecl
) |= DECL_DEFER_OUTPUT (olddecl
);
2304 TREE_PUBLIC (newdecl
) = TREE_PUBLIC (olddecl
);
2305 TREE_STATIC (olddecl
) = TREE_STATIC (newdecl
) |= TREE_STATIC (olddecl
);
2306 if (! DECL_EXTERNAL (olddecl
))
2307 DECL_EXTERNAL (newdecl
) = 0;
2308 if (! DECL_COMDAT (olddecl
))
2309 DECL_COMDAT (newdecl
) = 0;
2311 new_template_info
= NULL_TREE
;
2312 if (DECL_LANG_SPECIFIC (newdecl
) && DECL_LANG_SPECIFIC (olddecl
))
2314 bool new_redefines_gnu_inline
= false;
2316 if (new_defines_function
2317 && ((DECL_INTERFACE_KNOWN (olddecl
)
2318 && TREE_CODE (olddecl
) == FUNCTION_DECL
)
2319 || (TREE_CODE (olddecl
) == TEMPLATE_DECL
2320 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl
))
2321 == FUNCTION_DECL
))))
2325 if (TREE_CODE (fn
) == TEMPLATE_DECL
)
2326 fn
= DECL_TEMPLATE_RESULT (olddecl
);
2328 new_redefines_gnu_inline
= GNU_INLINE_P (fn
) && DECL_INITIAL (fn
);
2331 if (!new_redefines_gnu_inline
)
2333 DECL_INTERFACE_KNOWN (newdecl
) |= DECL_INTERFACE_KNOWN (olddecl
);
2334 DECL_NOT_REALLY_EXTERN (newdecl
) |= DECL_NOT_REALLY_EXTERN (olddecl
);
2335 DECL_COMDAT (newdecl
) |= DECL_COMDAT (olddecl
);
2337 DECL_TEMPLATE_INSTANTIATED (newdecl
)
2338 |= DECL_TEMPLATE_INSTANTIATED (olddecl
);
2339 DECL_ODR_USED (newdecl
) |= DECL_ODR_USED (olddecl
);
2341 /* If the OLDDECL is an instantiation and/or specialization,
2342 then the NEWDECL must be too. But, it may not yet be marked
2343 as such if the caller has created NEWDECL, but has not yet
2344 figured out that it is a redeclaration. */
2345 if (!DECL_USE_TEMPLATE (newdecl
))
2346 DECL_USE_TEMPLATE (newdecl
) = DECL_USE_TEMPLATE (olddecl
);
2348 /* Don't really know how much of the language-specific
2349 values we should copy from old to new. */
2350 DECL_IN_AGGR_P (newdecl
) = DECL_IN_AGGR_P (olddecl
);
2351 DECL_REPO_AVAILABLE_P (newdecl
) = DECL_REPO_AVAILABLE_P (olddecl
);
2352 DECL_INITIALIZED_IN_CLASS_P (newdecl
)
2353 |= DECL_INITIALIZED_IN_CLASS_P (olddecl
);
2355 if (LANG_DECL_HAS_MIN (newdecl
))
2357 DECL_ACCESS (newdecl
) = DECL_ACCESS (olddecl
);
2358 if (DECL_TEMPLATE_INFO (newdecl
))
2360 new_template_info
= DECL_TEMPLATE_INFO (newdecl
);
2361 if (DECL_TEMPLATE_INSTANTIATION (olddecl
)
2362 && DECL_TEMPLATE_SPECIALIZATION (newdecl
))
2363 /* Remember the presence of explicit specialization args. */
2364 TINFO_USED_TEMPLATE_ID (DECL_TEMPLATE_INFO (olddecl
))
2365 = TINFO_USED_TEMPLATE_ID (new_template_info
);
2367 DECL_TEMPLATE_INFO (newdecl
) = DECL_TEMPLATE_INFO (olddecl
);
2369 /* Only functions have these fields. */
2370 if (DECL_DECLARES_FUNCTION_P (newdecl
))
2372 DECL_NONCONVERTING_P (newdecl
) = DECL_NONCONVERTING_P (olddecl
);
2373 DECL_BEFRIENDING_CLASSES (newdecl
)
2374 = chainon (DECL_BEFRIENDING_CLASSES (newdecl
),
2375 DECL_BEFRIENDING_CLASSES (olddecl
));
2376 /* DECL_THUNKS is only valid for virtual functions,
2377 otherwise it is a DECL_FRIEND_CONTEXT. */
2378 if (DECL_VIRTUAL_P (newdecl
))
2379 SET_DECL_THUNKS (newdecl
, DECL_THUNKS (olddecl
));
2381 /* Only variables have this field. */
2382 else if (VAR_P (newdecl
)
2383 && VAR_HAD_UNKNOWN_BOUND (olddecl
))
2384 SET_VAR_HAD_UNKNOWN_BOUND (newdecl
);
2387 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2391 /* Merge parameter attributes. */
2392 tree oldarg
, newarg
;
2393 for (oldarg
= DECL_ARGUMENTS(olddecl
), newarg
= DECL_ARGUMENTS(newdecl
);
2395 oldarg
= DECL_CHAIN(oldarg
), newarg
= DECL_CHAIN(newarg
))
2397 DECL_ATTRIBUTES (newarg
)
2398 = (*targetm
.merge_decl_attributes
) (oldarg
, newarg
);
2399 DECL_ATTRIBUTES (oldarg
) = DECL_ATTRIBUTES (newarg
);
2402 if (DECL_TEMPLATE_INSTANTIATION (olddecl
)
2403 && !DECL_TEMPLATE_INSTANTIATION (newdecl
))
2405 /* If newdecl is not a specialization, then it is not a
2406 template-related function at all. And that means that we
2407 should have exited above, returning 0. */
2408 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl
));
2410 if (DECL_ODR_USED (olddecl
))
2411 /* From [temp.expl.spec]:
2413 If a template, a member template or the member of a class
2414 template is explicitly specialized then that
2415 specialization shall be declared before the first use of
2416 that specialization that would cause an implicit
2417 instantiation to take place, in every translation unit in
2418 which such a use occurs. */
2419 error ("explicit specialization of %qD after first use",
2422 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl
);
2423 DECL_COMDAT (newdecl
) = (TREE_PUBLIC (newdecl
)
2424 && DECL_DECLARED_INLINE_P (newdecl
));
2426 /* Don't propagate visibility from the template to the
2427 specialization here. We'll do that in determine_visibility if
2429 DECL_VISIBILITY_SPECIFIED (olddecl
) = 0;
2431 /* [temp.expl.spec/14] We don't inline explicit specialization
2432 just because the primary template says so. */
2433 gcc_assert (!merge_attr
);
2435 DECL_DECLARED_INLINE_P (olddecl
)
2436 = DECL_DECLARED_INLINE_P (newdecl
);
2438 DECL_DISREGARD_INLINE_LIMITS (olddecl
)
2439 = DECL_DISREGARD_INLINE_LIMITS (newdecl
);
2441 DECL_UNINLINABLE (olddecl
) = DECL_UNINLINABLE (newdecl
);
2443 else if (new_defines_function
&& DECL_INITIAL (olddecl
))
2445 /* Never inline re-defined extern inline functions.
2446 FIXME: this could be better handled by keeping both
2447 function as separate declarations. */
2448 DECL_UNINLINABLE (newdecl
) = 1;
2452 if (DECL_PENDING_INLINE_P (olddecl
))
2454 DECL_PENDING_INLINE_P (newdecl
) = 1;
2455 DECL_PENDING_INLINE_INFO (newdecl
)
2456 = DECL_PENDING_INLINE_INFO (olddecl
);
2458 else if (DECL_PENDING_INLINE_P (newdecl
))
2460 else if (DECL_SAVED_FUNCTION_DATA (newdecl
) == NULL
)
2461 DECL_SAVED_FUNCTION_DATA (newdecl
)
2462 = DECL_SAVED_FUNCTION_DATA (olddecl
);
2464 DECL_DECLARED_INLINE_P (newdecl
) |= DECL_DECLARED_INLINE_P (olddecl
);
2466 DECL_UNINLINABLE (newdecl
) = DECL_UNINLINABLE (olddecl
)
2467 = (DECL_UNINLINABLE (newdecl
) || DECL_UNINLINABLE (olddecl
));
2469 DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2470 = DECL_DISREGARD_INLINE_LIMITS (olddecl
)
2471 = (DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2472 || DECL_DISREGARD_INLINE_LIMITS (olddecl
));
2475 /* Preserve abstractness on cloned [cd]tors. */
2476 DECL_ABSTRACT_P (newdecl
) = DECL_ABSTRACT_P (olddecl
);
2478 /* Update newdecl's parms to point at olddecl. */
2479 for (parm
= DECL_ARGUMENTS (newdecl
); parm
;
2480 parm
= DECL_CHAIN (parm
))
2481 DECL_CONTEXT (parm
) = olddecl
;
2485 SET_DECL_LANGUAGE (olddecl
, DECL_LANGUAGE (newdecl
));
2486 COPY_DECL_ASSEMBLER_NAME (newdecl
, olddecl
);
2487 COPY_DECL_RTL (newdecl
, olddecl
);
2489 if (! types_match
|| new_defines_function
)
2491 /* These need to be copied so that the names are available.
2492 Note that if the types do match, we'll preserve inline
2493 info and other bits, but if not, we won't. */
2494 DECL_ARGUMENTS (olddecl
) = DECL_ARGUMENTS (newdecl
);
2495 DECL_RESULT (olddecl
) = DECL_RESULT (newdecl
);
2497 /* If redeclaring a builtin function, it stays built in
2498 if newdecl is a gnu_inline definition, or if newdecl is just
2500 if (fndecl_built_in_p (olddecl
)
2501 && (new_defines_function
? GNU_INLINE_P (newdecl
) : types_match
))
2503 DECL_BUILT_IN_CLASS (newdecl
) = DECL_BUILT_IN_CLASS (olddecl
);
2504 DECL_FUNCTION_CODE (newdecl
) = DECL_FUNCTION_CODE (olddecl
);
2505 /* If we're keeping the built-in definition, keep the rtl,
2506 regardless of declaration matches. */
2507 COPY_DECL_RTL (olddecl
, newdecl
);
2508 if (DECL_BUILT_IN_CLASS (newdecl
) == BUILT_IN_NORMAL
)
2510 enum built_in_function fncode
= DECL_FUNCTION_CODE (newdecl
);
2513 /* If a compatible prototype of these builtin functions
2514 is seen, assume the runtime implements it with the
2515 expected semantics. */
2516 case BUILT_IN_STPCPY
:
2517 if (builtin_decl_explicit_p (fncode
))
2518 set_builtin_decl_implicit_p (fncode
, true);
2521 if (builtin_decl_explicit_p (fncode
))
2522 set_builtin_decl_declared_p (fncode
, true);
2527 copy_attributes_to_builtin (newdecl
);
2529 if (new_defines_function
)
2530 /* If defining a function declared with other language
2531 linkage, use the previously declared language linkage. */
2532 SET_DECL_LANGUAGE (newdecl
, DECL_LANGUAGE (olddecl
));
2533 else if (types_match
)
2535 DECL_RESULT (newdecl
) = DECL_RESULT (olddecl
);
2536 /* Don't clear out the arguments if we're just redeclaring a
2538 if (DECL_ARGUMENTS (olddecl
))
2539 DECL_ARGUMENTS (newdecl
) = DECL_ARGUMENTS (olddecl
);
2542 else if (TREE_CODE (newdecl
) == NAMESPACE_DECL
)
2543 NAMESPACE_LEVEL (newdecl
) = NAMESPACE_LEVEL (olddecl
);
2545 /* Now preserve various other info from the definition. */
2546 TREE_ADDRESSABLE (newdecl
) = TREE_ADDRESSABLE (olddecl
);
2547 TREE_ASM_WRITTEN (newdecl
) = TREE_ASM_WRITTEN (olddecl
);
2548 DECL_COMMON (newdecl
) = DECL_COMMON (olddecl
);
2549 COPY_DECL_ASSEMBLER_NAME (olddecl
, newdecl
);
2551 /* Warn about conflicting visibility specifications. */
2552 if (DECL_VISIBILITY_SPECIFIED (olddecl
)
2553 && DECL_VISIBILITY_SPECIFIED (newdecl
)
2554 && DECL_VISIBILITY (newdecl
) != DECL_VISIBILITY (olddecl
))
2556 auto_diagnostic_group d
;
2557 if (warning_at (newdecl_loc
, OPT_Wattributes
,
2558 "%qD: visibility attribute ignored because it "
2559 "conflicts with previous declaration", newdecl
))
2560 inform (olddecl_loc
,
2561 "previous declaration of %qD", olddecl
);
2563 /* Choose the declaration which specified visibility. */
2564 if (DECL_VISIBILITY_SPECIFIED (olddecl
))
2566 DECL_VISIBILITY (newdecl
) = DECL_VISIBILITY (olddecl
);
2567 DECL_VISIBILITY_SPECIFIED (newdecl
) = 1;
2569 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2570 so keep this behavior. */
2571 if (VAR_P (newdecl
) && DECL_HAS_INIT_PRIORITY_P (newdecl
))
2573 SET_DECL_INIT_PRIORITY (olddecl
, DECL_INIT_PRIORITY (newdecl
));
2574 DECL_HAS_INIT_PRIORITY_P (olddecl
) = 1;
2576 /* Likewise for DECL_ALIGN, DECL_USER_ALIGN and DECL_PACKED. */
2577 if (DECL_ALIGN (olddecl
) > DECL_ALIGN (newdecl
))
2579 SET_DECL_ALIGN (newdecl
, DECL_ALIGN (olddecl
));
2580 DECL_USER_ALIGN (newdecl
) |= DECL_USER_ALIGN (olddecl
);
2582 DECL_USER_ALIGN (olddecl
) = DECL_USER_ALIGN (newdecl
);
2583 if (DECL_WARN_IF_NOT_ALIGN (olddecl
)
2584 > DECL_WARN_IF_NOT_ALIGN (newdecl
))
2585 SET_DECL_WARN_IF_NOT_ALIGN (newdecl
,
2586 DECL_WARN_IF_NOT_ALIGN (olddecl
));
2587 if (TREE_CODE (newdecl
) == FIELD_DECL
)
2588 DECL_PACKED (olddecl
) = DECL_PACKED (newdecl
);
2590 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2591 with that from NEWDECL below. */
2592 if (DECL_LANG_SPECIFIC (olddecl
))
2594 gcc_assert (DECL_LANG_SPECIFIC (olddecl
)
2595 != DECL_LANG_SPECIFIC (newdecl
));
2596 ggc_free (DECL_LANG_SPECIFIC (olddecl
));
2599 /* Merge the USED information. */
2600 if (TREE_USED (olddecl
))
2601 TREE_USED (newdecl
) = 1;
2602 else if (TREE_USED (newdecl
))
2603 TREE_USED (olddecl
) = 1;
2604 if (VAR_P (newdecl
))
2606 if (DECL_READ_P (olddecl
))
2607 DECL_READ_P (newdecl
) = 1;
2608 else if (DECL_READ_P (newdecl
))
2609 DECL_READ_P (olddecl
) = 1;
2611 if (DECL_PRESERVE_P (olddecl
))
2612 DECL_PRESERVE_P (newdecl
) = 1;
2613 else if (DECL_PRESERVE_P (newdecl
))
2614 DECL_PRESERVE_P (olddecl
) = 1;
2616 /* Merge the DECL_FUNCTION_VERSIONED information. newdecl will be copied
2617 to olddecl and deleted. */
2618 if (TREE_CODE (newdecl
) == FUNCTION_DECL
2619 && DECL_FUNCTION_VERSIONED (olddecl
))
2621 /* Set the flag for newdecl so that it gets copied to olddecl. */
2622 DECL_FUNCTION_VERSIONED (newdecl
) = 1;
2623 /* newdecl will be purged after copying to olddecl and is no longer
2625 cgraph_node::delete_function_version_by_decl (newdecl
);
2628 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2631 struct symtab_node
*snode
= symtab_node::get (olddecl
);
2633 function_size
= sizeof (struct tree_decl_common
);
2635 memcpy ((char *) olddecl
+ sizeof (struct tree_common
),
2636 (char *) newdecl
+ sizeof (struct tree_common
),
2637 function_size
- sizeof (struct tree_common
));
2639 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2640 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2641 sizeof (struct tree_function_decl
) - sizeof (struct tree_decl_common
));
2643 /* Preserve symtab node mapping. */
2644 olddecl
->decl_with_vis
.symtab_node
= snode
;
2646 if (new_template_info
)
2647 /* If newdecl is a template instantiation, it is possible that
2648 the following sequence of events has occurred:
2650 o A friend function was declared in a class template. The
2651 class template was instantiated.
2653 o The instantiation of the friend declaration was
2654 recorded on the instantiation list, and is newdecl.
2656 o Later, however, instantiate_class_template called pushdecl
2657 on the newdecl to perform name injection. But, pushdecl in
2658 turn called duplicate_decls when it discovered that another
2659 declaration of a global function with the same name already
2662 o Here, in duplicate_decls, we decided to clobber newdecl.
2664 If we're going to do that, we'd better make sure that
2665 olddecl, and not newdecl, is on the list of
2666 instantiations so that if we try to do the instantiation
2667 again we won't get the clobbered declaration. */
2668 reregister_specialization (newdecl
,
2674 size_t size
= tree_code_size (TREE_CODE (newdecl
));
2676 memcpy ((char *) olddecl
+ sizeof (struct tree_common
),
2677 (char *) newdecl
+ sizeof (struct tree_common
),
2678 sizeof (struct tree_decl_common
) - sizeof (struct tree_common
));
2679 switch (TREE_CODE (newdecl
))
2689 struct symtab_node
*snode
= NULL
;
2692 && (TREE_STATIC (olddecl
) || TREE_PUBLIC (olddecl
)
2693 || DECL_EXTERNAL (olddecl
)))
2694 snode
= symtab_node::get (olddecl
);
2695 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2696 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2697 size
- sizeof (struct tree_decl_common
)
2698 + TREE_CODE_LENGTH (TREE_CODE (newdecl
)) * sizeof (char *));
2699 if (VAR_P (newdecl
))
2700 olddecl
->decl_with_vis
.symtab_node
= snode
;
2704 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2705 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2706 sizeof (struct tree_decl_non_common
) - sizeof (struct tree_decl_common
)
2707 + TREE_CODE_LENGTH (TREE_CODE (newdecl
)) * sizeof (char *));
2712 if (VAR_OR_FUNCTION_DECL_P (newdecl
))
2714 if (DECL_EXTERNAL (olddecl
)
2715 || TREE_PUBLIC (olddecl
)
2716 || TREE_STATIC (olddecl
))
2718 /* Merge the section attribute.
2719 We want to issue an error if the sections conflict but that must be
2720 done later in decl_attributes since we are called before attributes
2722 if (DECL_SECTION_NAME (newdecl
) != NULL
)
2723 set_decl_section_name (olddecl
, DECL_SECTION_NAME (newdecl
));
2725 if (DECL_ONE_ONLY (newdecl
))
2727 struct symtab_node
*oldsym
, *newsym
;
2728 if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
2729 oldsym
= cgraph_node::get_create (olddecl
);
2731 oldsym
= varpool_node::get_create (olddecl
);
2732 newsym
= symtab_node::get (newdecl
);
2733 oldsym
->set_comdat_group (newsym
->get_comdat_group ());
2738 && CP_DECL_THREAD_LOCAL_P (newdecl
))
2740 CP_DECL_THREAD_LOCAL_P (olddecl
) = true;
2741 if (!processing_template_decl
)
2742 set_decl_tls_model (olddecl
, DECL_TLS_MODEL (newdecl
));
2746 DECL_UID (olddecl
) = olddecl_uid
;
2748 DECL_FRIEND_P (olddecl
) = 1;
2751 DECL_ANTICIPATED (olddecl
) = 1;
2752 DECL_HIDDEN_FRIEND_P (olddecl
) = 1;
2755 /* NEWDECL contains the merged attribute lists.
2756 Update OLDDECL to be the same. */
2757 DECL_ATTRIBUTES (olddecl
) = DECL_ATTRIBUTES (newdecl
);
2759 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2760 so that encode_section_info has a chance to look at the new decl
2761 flags and attributes. */
2762 if (DECL_RTL_SET_P (olddecl
)
2763 && (TREE_CODE (olddecl
) == FUNCTION_DECL
2765 && TREE_STATIC (olddecl
))))
2766 make_decl_rtl (olddecl
);
2768 /* The NEWDECL will no longer be needed. Because every out-of-class
2769 declaration of a member results in a call to duplicate_decls,
2770 freeing these nodes represents in a significant savings.
2772 Before releasing the node, be sore to remove function from symbol
2773 table that might have been inserted there to record comdat group.
2774 Be sure to however do not free DECL_STRUCT_FUNCTION because this
2775 structure is shared in between newdecl and oldecl. */
2776 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2777 DECL_STRUCT_FUNCTION (newdecl
) = NULL
;
2778 if (VAR_OR_FUNCTION_DECL_P (newdecl
))
2780 struct symtab_node
*snode
= symtab_node::get (newdecl
);
2785 /* Remove the associated constraints for newdecl, if any, before
2786 reclaiming memory. */
2788 remove_constraints (newdecl
);
2795 /* Return zero if the declaration NEWDECL is valid
2796 when the declaration OLDDECL (assumed to be for the same name)
2797 has already been seen.
2798 Otherwise return an error message format string with a %s
2799 where the identifier should go. */
2802 redeclaration_error_message (tree newdecl
, tree olddecl
)
2804 if (TREE_CODE (newdecl
) == TYPE_DECL
)
2806 /* Because C++ can put things into name space for free,
2807 constructs like "typedef struct foo { ... } foo"
2808 would look like an erroneous redeclaration. */
2809 if (same_type_p (TREE_TYPE (newdecl
), TREE_TYPE (olddecl
)))
2812 return G_("redefinition of %q#D");
2814 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2816 /* If this is a pure function, its olddecl will actually be
2817 the original initialization to `0' (which we force to call
2818 abort()). Don't complain about redefinition in this case. */
2819 if (DECL_LANG_SPECIFIC (olddecl
) && DECL_PURE_VIRTUAL_P (olddecl
)
2820 && DECL_INITIAL (olddecl
) == NULL_TREE
)
2823 /* If both functions come from different namespaces, this is not
2824 a redeclaration - this is a conflict with a used function. */
2825 if (DECL_NAMESPACE_SCOPE_P (olddecl
)
2826 && DECL_CONTEXT (olddecl
) != DECL_CONTEXT (newdecl
)
2827 && ! decls_match (olddecl
, newdecl
))
2828 return G_("%qD conflicts with used function");
2830 /* We'll complain about linkage mismatches in
2831 warn_extern_redeclared_static. */
2833 /* Defining the same name twice is no good. */
2834 if (decl_defined_p (olddecl
)
2835 && decl_defined_p (newdecl
))
2837 if (DECL_NAME (olddecl
) == NULL_TREE
)
2838 return G_("%q#D not declared in class");
2839 else if (!GNU_INLINE_P (olddecl
)
2840 || GNU_INLINE_P (newdecl
))
2841 return G_("redefinition of %q#D");
2844 if (DECL_DECLARED_INLINE_P (olddecl
) && DECL_DECLARED_INLINE_P (newdecl
))
2846 bool olda
= GNU_INLINE_P (olddecl
);
2847 bool newa
= GNU_INLINE_P (newdecl
);
2852 return G_("%q+D redeclared inline with "
2853 "%<gnu_inline%> attribute");
2855 return G_("%q+D redeclared inline without "
2856 "%<gnu_inline%> attribute");
2860 check_abi_tag_redeclaration
2861 (olddecl
, lookup_attribute ("abi_tag", DECL_ATTRIBUTES (olddecl
)),
2862 lookup_attribute ("abi_tag", DECL_ATTRIBUTES (newdecl
)));
2866 else if (TREE_CODE (newdecl
) == TEMPLATE_DECL
)
2870 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) == TYPE_DECL
)
2872 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl
))
2873 && COMPLETE_TYPE_P (TREE_TYPE (olddecl
)))
2874 return G_("redefinition of %q#D");
2878 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) != FUNCTION_DECL
2879 || (DECL_TEMPLATE_RESULT (newdecl
)
2880 == DECL_TEMPLATE_RESULT (olddecl
)))
2883 nt
= DECL_TEMPLATE_RESULT (newdecl
);
2884 if (DECL_TEMPLATE_INFO (nt
))
2885 nt
= DECL_TEMPLATE_RESULT (template_for_substitution (nt
));
2886 ot
= DECL_TEMPLATE_RESULT (olddecl
);
2887 if (DECL_TEMPLATE_INFO (ot
))
2888 ot
= DECL_TEMPLATE_RESULT (template_for_substitution (ot
));
2889 if (DECL_INITIAL (nt
) && DECL_INITIAL (ot
)
2890 && (!GNU_INLINE_P (ot
) || GNU_INLINE_P (nt
)))
2891 return G_("redefinition of %q#D");
2893 if (DECL_DECLARED_INLINE_P (ot
) && DECL_DECLARED_INLINE_P (nt
))
2895 bool olda
= GNU_INLINE_P (ot
);
2896 bool newa
= GNU_INLINE_P (nt
);
2901 return G_("%q+D redeclared inline with "
2902 "%<gnu_inline%> attribute");
2904 return G_("%q+D redeclared inline without "
2905 "%<gnu_inline%> attribute");
2909 /* Core issue #226 (C++0x):
2911 If a friend function template declaration specifies a
2912 default template-argument, that declaration shall be a
2913 definition and shall be the only declaration of the
2914 function template in the translation unit. */
2915 if ((cxx_dialect
!= cxx98
)
2916 && TREE_CODE (ot
) == FUNCTION_DECL
&& DECL_FRIEND_P (ot
)
2917 && !check_default_tmpl_args (nt
, DECL_TEMPLATE_PARMS (newdecl
),
2918 /*is_primary=*/true,
2919 /*is_partial=*/false,
2920 /*is_friend_decl=*/2))
2921 return G_("redeclaration of friend %q#D "
2922 "may not have default template arguments");
2926 else if (VAR_P (newdecl
)
2927 && CP_DECL_THREAD_LOCAL_P (newdecl
) != CP_DECL_THREAD_LOCAL_P (olddecl
)
2928 && (! DECL_LANG_SPECIFIC (olddecl
)
2929 || ! CP_DECL_THREADPRIVATE_P (olddecl
)
2930 || CP_DECL_THREAD_LOCAL_P (newdecl
)))
2932 /* Only variables can be thread-local, and all declarations must
2933 agree on this property. */
2934 if (CP_DECL_THREAD_LOCAL_P (newdecl
))
2935 return G_("thread-local declaration of %q#D follows "
2936 "non-thread-local declaration");
2938 return G_("non-thread-local declaration of %q#D follows "
2939 "thread-local declaration");
2941 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl
))
2943 /* The objects have been declared at namespace scope. If either
2944 is a member of an anonymous union, then this is an invalid
2945 redeclaration. For example:
2951 if ((VAR_P (newdecl
) && DECL_ANON_UNION_VAR_P (newdecl
))
2952 || (VAR_P (olddecl
) && DECL_ANON_UNION_VAR_P (olddecl
)))
2953 return G_("redeclaration of %q#D");
2954 /* If at least one declaration is a reference, there is no
2955 conflict. For example:
2961 if (DECL_EXTERNAL (newdecl
) || DECL_EXTERNAL (olddecl
))
2964 /* Static data member declared outside a class definition
2965 if the variable is defined within the class with constexpr
2966 specifier is declaration rather than definition (and
2968 if (cxx_dialect
>= cxx17
2970 && DECL_CLASS_SCOPE_P (olddecl
)
2971 && DECL_DECLARED_CONSTEXPR_P (olddecl
)
2972 && !DECL_INITIAL (newdecl
))
2974 DECL_EXTERNAL (newdecl
) = 1;
2975 /* For now, only warn with explicit -Wdeprecated. */
2976 if (global_options_set
.x_warn_deprecated
)
2978 auto_diagnostic_group d
;
2979 if (warning_at (DECL_SOURCE_LOCATION (newdecl
), OPT_Wdeprecated
,
2980 "redundant redeclaration of %<constexpr%> "
2981 "static data member %qD", newdecl
))
2982 inform (DECL_SOURCE_LOCATION (olddecl
),
2983 "previous declaration of %qD", olddecl
);
2988 /* Reject two definitions. */
2989 return G_("redefinition of %q#D");
2993 /* Objects declared with block scope: */
2994 /* Reject two definitions, and reject a definition
2995 together with an external reference. */
2996 if (!(DECL_EXTERNAL (newdecl
) && DECL_EXTERNAL (olddecl
)))
2997 return G_("redeclaration of %q#D");
3003 /* Hash and equality functions for the named_label table. */
3006 named_label_hash::hash (const value_type entry
)
3008 return IDENTIFIER_HASH_VALUE (entry
->name
);
3012 named_label_hash::equal (const value_type entry
, compare_type name
)
3014 return name
== entry
->name
;
3017 /* Look for a label named ID in the current function. If one cannot
3018 be found, create one. Return the named_label_entry, or NULL on
3021 static named_label_entry
*
3022 lookup_label_1 (tree id
, bool making_local_p
)
3024 /* You can't use labels at global scope. */
3025 if (current_function_decl
== NULL_TREE
)
3027 error ("label %qE referenced outside of any function", id
);
3032 named_labels
= hash_table
<named_label_hash
>::create_ggc (13);
3034 hashval_t hash
= IDENTIFIER_HASH_VALUE (id
);
3035 named_label_entry
**slot
3036 = named_labels
->find_slot_with_hash (id
, hash
, INSERT
);
3037 named_label_entry
*old
= *slot
;
3039 if (old
&& old
->label_decl
)
3041 if (!making_local_p
)
3044 if (old
->binding_level
== current_binding_level
)
3046 error ("local label %qE conflicts with existing label", id
);
3047 inform (DECL_SOURCE_LOCATION (old
->label_decl
), "previous label");
3052 /* We are making a new decl, create or reuse the named_label_entry */
3053 named_label_entry
*ent
= NULL
;
3054 if (old
&& !old
->label_decl
)
3058 ent
= ggc_cleared_alloc
<named_label_entry
> ();
3064 /* Now create the LABEL_DECL. */
3065 tree decl
= build_decl (input_location
, LABEL_DECL
, id
, void_type_node
);
3067 DECL_CONTEXT (decl
) = current_function_decl
;
3068 SET_DECL_MODE (decl
, VOIDmode
);
3071 C_DECLARED_LABEL_FLAG (decl
) = true;
3072 DECL_CHAIN (decl
) = current_binding_level
->names
;
3073 current_binding_level
->names
= decl
;
3076 ent
->label_decl
= decl
;
3081 /* Wrapper for lookup_label_1. */
3084 lookup_label (tree id
)
3086 bool subtime
= timevar_cond_start (TV_NAME_LOOKUP
);
3087 named_label_entry
*ent
= lookup_label_1 (id
, false);
3088 timevar_cond_stop (TV_NAME_LOOKUP
, subtime
);
3089 return ent
? ent
->label_decl
: NULL_TREE
;
3093 declare_local_label (tree id
)
3095 bool subtime
= timevar_cond_start (TV_NAME_LOOKUP
);
3096 named_label_entry
*ent
= lookup_label_1 (id
, true);
3097 timevar_cond_stop (TV_NAME_LOOKUP
, subtime
);
3098 return ent
? ent
->label_decl
: NULL_TREE
;
3101 /* Returns nonzero if it is ill-formed to jump past the declaration of
3102 DECL. Returns 2 if it's also a real problem. */
3105 decl_jump_unsafe (tree decl
)
3107 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
3108 with automatic storage duration is not in scope to a point where it is
3109 in scope is ill-formed unless the variable has scalar type, class type
3110 with a trivial default constructor and a trivial destructor, a
3111 cv-qualified version of one of these types, or an array of one of the
3112 preceding types and is declared without an initializer (8.5). */
3113 tree type
= TREE_TYPE (decl
);
3115 if (!VAR_P (decl
) || TREE_STATIC (decl
)
3116 || type
== error_mark_node
)
3119 if (DECL_NONTRIVIALLY_INITIALIZED_P (decl
)
3120 || variably_modified_type_p (type
, NULL_TREE
))
3123 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
))
3129 /* A subroutine of check_previous_goto_1 and check_goto to identify a branch
3133 identify_goto (tree decl
, location_t loc
, const location_t
*locus
,
3134 diagnostic_t diag_kind
)
3137 = emit_diagnostic (diag_kind
, loc
, 0,
3138 decl
? N_("jump to label %qD")
3139 : N_("jump to case label"), decl
);
3140 if (complained
&& locus
)
3141 inform (*locus
, " from here");
3145 /* Check that a single previously seen jump to a newly defined label
3146 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
3147 the jump context; NAMES are the names in scope in LEVEL at the jump
3148 context; LOCUS is the source position of the jump or 0. Returns
3149 true if all is well. */
3152 check_previous_goto_1 (tree decl
, cp_binding_level
* level
, tree names
,
3153 bool exited_omp
, const location_t
*locus
)
3155 cp_binding_level
*b
;
3156 bool complained
= false;
3158 bool saw_eh
= false, saw_omp
= false, saw_tm
= false, saw_cxif
= false;
3162 complained
= identify_goto (decl
, input_location
, locus
, DK_ERROR
);
3164 inform (input_location
, " exits OpenMP structured block");
3169 for (b
= current_binding_level
; b
; b
= b
->level_chain
)
3171 tree new_decls
, old_decls
= (b
== level
? names
: NULL_TREE
);
3173 for (new_decls
= b
->names
; new_decls
!= old_decls
;
3174 new_decls
= (DECL_P (new_decls
) ? DECL_CHAIN (new_decls
)
3175 : TREE_CHAIN (new_decls
)))
3177 int problem
= decl_jump_unsafe (new_decls
);
3183 complained
= identify_goto (decl
, input_location
, locus
,
3185 ? DK_ERROR
: DK_PERMERROR
);
3191 inform (DECL_SOURCE_LOCATION (new_decls
),
3192 " crosses initialization of %q#D", new_decls
);
3194 inform (DECL_SOURCE_LOCATION (new_decls
),
3195 " enters scope of %q#D, which has "
3196 "non-trivial destructor", new_decls
);
3203 const char *inf
= NULL
;
3204 location_t loc
= input_location
;
3209 inf
= N_("enters try block");
3215 inf
= N_("enters catch block");
3221 inf
= N_("enters OpenMP structured block");
3225 case sk_transaction
:
3227 inf
= N_("enters synchronized or atomic statement");
3232 if (!saw_cxif
&& level_for_constexpr_if (b
->level_chain
))
3234 inf
= N_("enters constexpr if statement");
3235 loc
= EXPR_LOCATION (b
->level_chain
->this_entity
);
3247 complained
= identify_goto (decl
, input_location
, locus
, DK_ERROR
);
3250 inform (loc
, " %s", inf
);
3258 check_previous_goto (tree decl
, struct named_label_use_entry
*use
)
3260 check_previous_goto_1 (decl
, use
->binding_level
,
3261 use
->names_in_scope
, use
->in_omp_scope
,
3262 &use
->o_goto_locus
);
3266 check_switch_goto (cp_binding_level
* level
)
3268 return check_previous_goto_1 (NULL_TREE
, level
, level
->names
, false, NULL
);
3271 /* Check that a new jump to a label DECL is OK. Called by
3272 finish_goto_stmt. */
3275 check_goto (tree decl
)
3277 /* We can't know where a computed goto is jumping.
3278 So we assume that it's OK. */
3279 if (TREE_CODE (decl
) != LABEL_DECL
)
3282 /* We didn't record any information about this label when we created it,
3283 and there's not much point since it's trivial to analyze as a return. */
3284 if (decl
== cdtor_label
)
3287 hashval_t hash
= IDENTIFIER_HASH_VALUE (DECL_NAME (decl
));
3288 named_label_entry
**slot
3289 = named_labels
->find_slot_with_hash (DECL_NAME (decl
), hash
, NO_INSERT
);
3290 named_label_entry
*ent
= *slot
;
3292 /* If the label hasn't been defined yet, defer checking. */
3293 if (! DECL_INITIAL (decl
))
3295 /* Don't bother creating another use if the last goto had the
3296 same data, and will therefore create the same set of errors. */
3298 && ent
->uses
->names_in_scope
== current_binding_level
->names
)
3301 named_label_use_entry
*new_use
3302 = ggc_alloc
<named_label_use_entry
> ();
3303 new_use
->binding_level
= current_binding_level
;
3304 new_use
->names_in_scope
= current_binding_level
->names
;
3305 new_use
->o_goto_locus
= input_location
;
3306 new_use
->in_omp_scope
= false;
3308 new_use
->next
= ent
->uses
;
3309 ent
->uses
= new_use
;
3313 bool saw_catch
= false, complained
= false;
3318 if (ent
->in_try_scope
|| ent
->in_catch_scope
|| ent
->in_transaction_scope
3319 || ent
->in_constexpr_if
3320 || ent
->in_omp_scope
|| !vec_safe_is_empty (ent
->bad_decls
))
3322 diagnostic_t diag_kind
= DK_PERMERROR
;
3323 if (ent
->in_try_scope
|| ent
->in_catch_scope
|| ent
->in_constexpr_if
3324 || ent
->in_transaction_scope
|| ent
->in_omp_scope
)
3325 diag_kind
= DK_ERROR
;
3326 complained
= identify_goto (decl
, DECL_SOURCE_LOCATION (decl
),
3327 &input_location
, diag_kind
);
3328 identified
= 1 + (diag_kind
== DK_ERROR
);
3331 FOR_EACH_VEC_SAFE_ELT (ent
->bad_decls
, ix
, bad
)
3333 int u
= decl_jump_unsafe (bad
);
3335 if (u
> 1 && DECL_ARTIFICIAL (bad
))
3337 /* Can't skip init of __exception_info. */
3338 if (identified
== 1)
3340 complained
= identify_goto (decl
, DECL_SOURCE_LOCATION (decl
),
3341 &input_location
, DK_ERROR
);
3345 inform (DECL_SOURCE_LOCATION (bad
), " enters catch block");
3348 else if (complained
)
3351 inform (DECL_SOURCE_LOCATION (bad
),
3352 " skips initialization of %q#D", bad
);
3354 inform (DECL_SOURCE_LOCATION (bad
),
3355 " enters scope of %q#D which has "
3356 "non-trivial destructor", bad
);
3362 if (ent
->in_try_scope
)
3363 inform (input_location
, " enters try block");
3364 else if (ent
->in_catch_scope
&& !saw_catch
)
3365 inform (input_location
, " enters catch block");
3366 else if (ent
->in_transaction_scope
)
3367 inform (input_location
, " enters synchronized or atomic statement");
3368 else if (ent
->in_constexpr_if
)
3369 inform (input_location
, " enters %<constexpr%> if statement");
3372 if (ent
->in_omp_scope
)
3375 inform (input_location
, " enters OpenMP structured block");
3377 else if (flag_openmp
)
3378 for (cp_binding_level
*b
= current_binding_level
; b
; b
= b
->level_chain
)
3380 if (b
== ent
->binding_level
)
3382 if (b
->kind
== sk_omp
)
3386 complained
= identify_goto (decl
,
3387 DECL_SOURCE_LOCATION (decl
),
3388 &input_location
, DK_ERROR
);
3392 inform (input_location
, " exits OpenMP structured block");
3398 /* Check that a return is ok wrt OpenMP structured blocks.
3399 Called by finish_return_stmt. Returns true if all is well. */
3402 check_omp_return (void)
3404 for (cp_binding_level
*b
= current_binding_level
; b
; b
= b
->level_chain
)
3405 if (b
->kind
== sk_omp
)
3407 error ("invalid exit from OpenMP structured block");
3410 else if (b
->kind
== sk_function_parms
)
3415 /* Define a label, specifying the location in the source file.
3416 Return the LABEL_DECL node for the label. */
3419 define_label_1 (location_t location
, tree name
)
3421 /* After labels, make any new cleanups in the function go into their
3422 own new (temporary) binding contour. */
3423 for (cp_binding_level
*p
= current_binding_level
;
3424 p
->kind
!= sk_function_parms
;
3426 p
->more_cleanups_ok
= 0;
3428 named_label_entry
*ent
= lookup_label_1 (name
, false);
3429 tree decl
= ent
->label_decl
;
3431 if (DECL_INITIAL (decl
) != NULL_TREE
)
3433 error ("duplicate label %qD", decl
);
3434 return error_mark_node
;
3438 /* Mark label as having been defined. */
3439 DECL_INITIAL (decl
) = error_mark_node
;
3440 /* Say where in the source. */
3441 DECL_SOURCE_LOCATION (decl
) = location
;
3443 ent
->binding_level
= current_binding_level
;
3444 ent
->names_in_scope
= current_binding_level
->names
;
3446 for (named_label_use_entry
*use
= ent
->uses
; use
; use
= use
->next
)
3447 check_previous_goto (decl
, use
);
3454 /* Wrapper for define_label_1. */
3457 define_label (location_t location
, tree name
)
3459 bool running
= timevar_cond_start (TV_NAME_LOOKUP
);
3460 tree ret
= define_label_1 (location
, name
);
3461 timevar_cond_stop (TV_NAME_LOOKUP
, running
);
3468 cp_binding_level
*level
;
3469 struct cp_switch
*next
;
3470 /* The SWITCH_STMT being built. */
3472 /* A splay-tree mapping the low element of a case range to the high
3473 element, or NULL_TREE if there is no high element. Used to
3474 determine whether or not a new case label duplicates an old case
3475 label. We need a tree, rather than simply a hash table, because
3476 of the GNU case range extension. */
3478 /* Remember whether there was a case value that is outside the
3479 range of the original type of the controlling expression. */
3480 bool outside_range_p
;
3481 /* Remember whether a default: case label has been seen. */
3483 /* Remember whether a BREAK_STMT has been seen in this SWITCH_STMT. */
3484 bool break_stmt_seen_p
;
3485 /* Set if inside of {FOR,DO,WHILE}_BODY nested inside of a switch,
3486 where BREAK_STMT doesn't belong to the SWITCH_STMT. */
3487 bool in_loop_body_p
;
3490 /* A stack of the currently active switch statements. The innermost
3491 switch statement is on the top of the stack. There is no need to
3492 mark the stack for garbage collection because it is only active
3493 during the processing of the body of a function, and we never
3494 collect at that point. */
3496 static struct cp_switch
*switch_stack
;
3498 /* Called right after a switch-statement condition is parsed.
3499 SWITCH_STMT is the switch statement being parsed. */
3502 push_switch (tree switch_stmt
)
3504 struct cp_switch
*p
= XNEW (struct cp_switch
);
3505 p
->level
= current_binding_level
;
3506 p
->next
= switch_stack
;
3507 p
->switch_stmt
= switch_stmt
;
3508 p
->cases
= splay_tree_new (case_compare
, NULL
, NULL
);
3509 p
->outside_range_p
= false;
3510 p
->has_default_p
= false;
3511 p
->break_stmt_seen_p
= false;
3512 p
->in_loop_body_p
= false;
3519 struct cp_switch
*cs
= switch_stack
;
3520 location_t switch_location
;
3522 /* Emit warnings as needed. */
3523 switch_location
= cp_expr_loc_or_loc (cs
->switch_stmt
, input_location
);
3524 const bool bool_cond_p
3525 = (SWITCH_STMT_TYPE (cs
->switch_stmt
)
3526 && TREE_CODE (SWITCH_STMT_TYPE (cs
->switch_stmt
)) == BOOLEAN_TYPE
);
3527 if (!processing_template_decl
)
3528 c_do_switch_warnings (cs
->cases
, switch_location
,
3529 SWITCH_STMT_TYPE (cs
->switch_stmt
),
3530 SWITCH_STMT_COND (cs
->switch_stmt
),
3531 bool_cond_p
, cs
->outside_range_p
);
3533 /* For the benefit of block_may_fallthru remember if the switch body
3534 case labels cover all possible values and if there are break; stmts. */
3535 if (cs
->has_default_p
3536 || (!processing_template_decl
3537 && c_switch_covers_all_cases_p (cs
->cases
,
3538 SWITCH_STMT_TYPE (cs
->switch_stmt
))))
3539 SWITCH_STMT_ALL_CASES_P (cs
->switch_stmt
) = 1;
3540 if (!cs
->break_stmt_seen_p
)
3541 SWITCH_STMT_NO_BREAK_P (cs
->switch_stmt
) = 1;
3542 gcc_assert (!cs
->in_loop_body_p
);
3543 splay_tree_delete (cs
->cases
);
3544 switch_stack
= switch_stack
->next
;
3548 /* Note that a BREAK_STMT is about to be added. If it is inside of
3549 a SWITCH_STMT and not inside of a loop body inside of it, note
3550 in switch_stack we've seen a BREAK_STMT. */
3553 note_break_stmt (void)
3555 if (switch_stack
&& !switch_stack
->in_loop_body_p
)
3556 switch_stack
->break_stmt_seen_p
= true;
3559 /* Note the start of processing of an iteration statement's body.
3560 The note_break_stmt function will do nothing while processing it.
3561 Return a flag that should be passed to note_iteration_stmt_body_end. */
3564 note_iteration_stmt_body_start (void)
3568 bool ret
= switch_stack
->in_loop_body_p
;
3569 switch_stack
->in_loop_body_p
= true;
3573 /* Note the end of processing of an iteration statement's body. */
3576 note_iteration_stmt_body_end (bool prev
)
3579 switch_stack
->in_loop_body_p
= prev
;
3582 /* Convert a case constant VALUE in a switch to the type TYPE of the switch
3583 condition. Note that if TYPE and VALUE are already integral we don't
3584 really do the conversion because the language-independent
3585 warning/optimization code will work better that way. */
3588 case_conversion (tree type
, tree value
)
3590 if (value
== NULL_TREE
)
3593 value
= mark_rvalue_use (value
);
3595 if (cxx_dialect
>= cxx11
3596 && (SCOPED_ENUM_P (type
)
3597 || !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (value
))))
3599 if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type
))
3600 type
= type_promotes_to (type
);
3601 value
= (perform_implicit_conversion_flags
3602 (type
, value
, tf_warning_or_error
,
3603 LOOKUP_IMPLICIT
| LOOKUP_NO_NON_INTEGRAL
));
3605 return cxx_constant_value (value
);
3608 /* Note that we've seen a definition of a case label, and complain if this
3609 is a bad place for one. */
3612 finish_case_label (location_t loc
, tree low_value
, tree high_value
)
3615 cp_binding_level
*p
;
3618 if (low_value
== NULL_TREE
&& high_value
== NULL_TREE
)
3619 switch_stack
->has_default_p
= true;
3621 if (processing_template_decl
)
3625 /* For templates, just add the case label; we'll do semantic
3626 analysis at instantiation-time. */
3627 label
= build_decl (loc
, LABEL_DECL
, NULL_TREE
, void_type_node
);
3628 return add_stmt (build_case_label (low_value
, high_value
, label
));
3631 /* Find the condition on which this switch statement depends. */
3632 cond
= SWITCH_STMT_COND (switch_stack
->switch_stmt
);
3633 if (cond
&& TREE_CODE (cond
) == TREE_LIST
)
3634 cond
= TREE_VALUE (cond
);
3636 if (!check_switch_goto (switch_stack
->level
))
3637 return error_mark_node
;
3639 type
= SWITCH_STMT_TYPE (switch_stack
->switch_stmt
);
3640 if (type
== error_mark_node
)
3641 return error_mark_node
;
3643 low_value
= case_conversion (type
, low_value
);
3644 high_value
= case_conversion (type
, high_value
);
3646 r
= c_add_case_label (loc
, switch_stack
->cases
, cond
, type
,
3647 low_value
, high_value
,
3648 &switch_stack
->outside_range_p
);
3650 /* After labels, make any new cleanups in the function go into their
3651 own new (temporary) binding contour. */
3652 for (p
= current_binding_level
;
3653 p
->kind
!= sk_function_parms
;
3655 p
->more_cleanups_ok
= 0;
3660 struct typename_info
{
3668 struct typename_hasher
: ggc_ptr_hash
<tree_node
>
3670 typedef typename_info
*compare_type
;
3672 /* Hash a TYPENAME_TYPE. */
3679 hash
= (htab_hash_pointer (TYPE_CONTEXT (t
))
3680 ^ htab_hash_pointer (TYPE_IDENTIFIER (t
)));
3685 /* Compare two TYPENAME_TYPEs. */
3688 equal (tree t1
, const typename_info
*t2
)
3690 return (TYPE_IDENTIFIER (t1
) == t2
->name
3691 && TYPE_CONTEXT (t1
) == t2
->scope
3692 && TYPENAME_TYPE_FULLNAME (t1
) == t2
->template_id
3693 && TYPENAME_IS_ENUM_P (t1
) == t2
->enum_p
3694 && TYPENAME_IS_CLASS_P (t1
) == t2
->class_p
);
3698 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
3699 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
3701 Returns the new TYPENAME_TYPE. */
3703 static GTY (()) hash_table
<typename_hasher
> *typename_htab
;
3706 build_typename_type (tree context
, tree name
, tree fullname
,
3707 enum tag_types tag_type
)
3715 if (typename_htab
== NULL
)
3716 typename_htab
= hash_table
<typename_hasher
>::create_ggc (61);
3718 ti
.scope
= FROB_CONTEXT (context
);
3720 ti
.template_id
= fullname
;
3721 ti
.enum_p
= tag_type
== enum_type
;
3722 ti
.class_p
= (tag_type
== class_type
3723 || tag_type
== record_type
3724 || tag_type
== union_type
);
3725 hash
= (htab_hash_pointer (ti
.scope
)
3726 ^ htab_hash_pointer (ti
.name
));
3728 /* See if we already have this type. */
3729 e
= typename_htab
->find_slot_with_hash (&ti
, hash
, INSERT
);
3734 /* Build the TYPENAME_TYPE. */
3735 t
= cxx_make_type (TYPENAME_TYPE
);
3736 TYPE_CONTEXT (t
) = ti
.scope
;
3737 TYPENAME_TYPE_FULLNAME (t
) = ti
.template_id
;
3738 TYPENAME_IS_ENUM_P (t
) = ti
.enum_p
;
3739 TYPENAME_IS_CLASS_P (t
) = ti
.class_p
;
3741 /* Build the corresponding TYPE_DECL. */
3742 d
= build_decl (input_location
, TYPE_DECL
, name
, t
);
3743 TYPE_NAME (TREE_TYPE (d
)) = d
;
3744 TYPE_STUB_DECL (TREE_TYPE (d
)) = d
;
3745 DECL_CONTEXT (d
) = FROB_CONTEXT (context
);
3746 DECL_ARTIFICIAL (d
) = 1;
3748 /* Store it in the hash table. */
3751 /* TYPENAME_TYPEs must always be compared structurally, because
3752 they may or may not resolve down to another type depending on
3753 the currently open classes. */
3754 SET_TYPE_STRUCTURAL_EQUALITY (t
);
3760 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
3761 provided to name the type. Returns an appropriate type, unless an
3762 error occurs, in which case error_mark_node is returned. If we
3763 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
3764 return that, rather than the _TYPE it corresponds to, in other
3765 cases we look through the type decl. If TF_ERROR is set, complain
3766 about errors, otherwise be quiet. */
3769 make_typename_type (tree context
, tree name
, enum tag_types tag_type
,
3770 tsubst_flags_t complain
)
3776 if (name
== error_mark_node
3777 || context
== NULL_TREE
3778 || context
== error_mark_node
)
3779 return error_mark_node
;
3783 if (!(TYPE_LANG_SPECIFIC (name
)
3784 && (CLASSTYPE_IS_TEMPLATE (name
)
3785 || CLASSTYPE_USE_TEMPLATE (name
))))
3786 name
= TYPE_IDENTIFIER (name
);
3788 /* Create a TEMPLATE_ID_EXPR for the type. */
3789 name
= build_nt (TEMPLATE_ID_EXPR
,
3790 CLASSTYPE_TI_TEMPLATE (name
),
3791 CLASSTYPE_TI_ARGS (name
));
3793 else if (TREE_CODE (name
) == TYPE_DECL
)
3794 name
= DECL_NAME (name
);
3798 if (TREE_CODE (name
) == TEMPLATE_ID_EXPR
)
3800 name
= TREE_OPERAND (name
, 0);
3801 if (DECL_TYPE_TEMPLATE_P (name
))
3802 name
= TREE_OPERAND (fullname
, 0) = DECL_NAME (name
);
3803 if (TREE_CODE (name
) != IDENTIFIER_NODE
)
3805 if (complain
& tf_error
)
3806 error ("%qD is not a type", name
);
3807 return error_mark_node
;
3810 if (TREE_CODE (name
) == TEMPLATE_DECL
)
3812 if (complain
& tf_error
)
3813 error ("%qD used without template arguments", name
);
3814 return error_mark_node
;
3816 gcc_assert (identifier_p (name
));
3817 gcc_assert (TYPE_P (context
));
3819 if (TREE_CODE (context
) == TYPE_PACK_EXPANSION
)
3820 /* This can happen for C++17 variadic using (c++/88986). */;
3821 else if (!MAYBE_CLASS_TYPE_P (context
))
3823 if (complain
& tf_error
)
3824 error ("%q#T is not a class", context
);
3825 return error_mark_node
;
3828 /* When the CONTEXT is a dependent type, NAME could refer to a
3829 dependent base class of CONTEXT. But look inside it anyway
3830 if CONTEXT is a currently open scope, in case it refers to a
3831 member of the current instantiation or a non-dependent base;
3832 lookup will stop when we hit a dependent base. */
3833 if (!dependent_scope_p (context
))
3834 /* We should only set WANT_TYPE when we're a nested typename type.
3835 Then we can give better diagnostics if we find a non-type. */
3836 t
= lookup_field (context
, name
, 2, /*want_type=*/true);
3840 if ((!t
|| TREE_CODE (t
) == TREE_LIST
) && dependent_type_p (context
))
3841 return build_typename_type (context
, name
, fullname
, tag_type
);
3843 want_template
= TREE_CODE (fullname
) == TEMPLATE_ID_EXPR
;
3847 if (complain
& tf_error
)
3849 if (!COMPLETE_TYPE_P (context
))
3850 cxx_incomplete_type_error (NULL_TREE
, context
);
3852 error (want_template
? G_("no class template named %q#T in %q#T")
3853 : G_("no type named %q#T in %q#T"), name
, context
);
3855 return error_mark_node
;
3858 /* Pull out the template from an injected-class-name (or multiple). */
3860 t
= maybe_get_template_decl_from_type_decl (t
);
3862 if (TREE_CODE (t
) == TREE_LIST
)
3864 if (complain
& tf_error
)
3866 error ("lookup of %qT in %qT is ambiguous", name
, context
);
3867 print_candidates (t
);
3869 return error_mark_node
;
3872 if (want_template
&& !DECL_TYPE_TEMPLATE_P (t
))
3874 if (complain
& tf_error
)
3875 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3877 return error_mark_node
;
3879 if (!want_template
&& TREE_CODE (t
) != TYPE_DECL
)
3881 if (complain
& tf_error
)
3882 error ("%<typename %T::%D%> names %q#T, which is not a type",
3884 return error_mark_node
;
3887 if (!perform_or_defer_access_check (TYPE_BINFO (context
), t
, t
, complain
))
3888 return error_mark_node
;
3890 /* If we are currently parsing a template and if T is a typedef accessed
3891 through CONTEXT then we need to remember and check access of T at
3892 template instantiation time. */
3893 add_typedef_to_current_template_for_access_check (t
, context
, input_location
);
3896 return lookup_template_class (t
, TREE_OPERAND (fullname
, 1),
3898 /*entering_scope=*/0,
3899 complain
| tf_user
);
3901 if (DECL_ARTIFICIAL (t
) || !(complain
& tf_keep_type_decl
))
3904 maybe_record_typedef_use (t
);
3909 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3910 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3911 in which case error_mark_node is returned.
3913 If PARM_LIST is non-NULL, also make sure that the template parameter
3914 list of TEMPLATE_DECL matches.
3916 If COMPLAIN zero, don't complain about any errors that occur. */
3919 make_unbound_class_template (tree context
, tree name
, tree parm_list
,
3920 tsubst_flags_t complain
)
3926 name
= TYPE_IDENTIFIER (name
);
3927 else if (DECL_P (name
))
3928 name
= DECL_NAME (name
);
3929 gcc_assert (identifier_p (name
));
3931 if (!dependent_type_p (context
)
3932 || currently_open_class (context
))
3934 tree tmpl
= NULL_TREE
;
3936 if (MAYBE_CLASS_TYPE_P (context
))
3937 tmpl
= lookup_field (context
, name
, 0, false);
3939 if (tmpl
&& TREE_CODE (tmpl
) == TYPE_DECL
)
3940 tmpl
= maybe_get_template_decl_from_type_decl (tmpl
);
3942 if (!tmpl
|| !DECL_TYPE_TEMPLATE_P (tmpl
))
3944 if (complain
& tf_error
)
3945 error ("no class template named %q#T in %q#T", name
, context
);
3946 return error_mark_node
;
3950 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl
), parm_list
))
3952 if (complain
& tf_error
)
3954 error ("template parameters do not match template %qD", tmpl
);
3955 inform (DECL_SOURCE_LOCATION (tmpl
),
3956 "%qD declared here", tmpl
);
3958 return error_mark_node
;
3961 if (!perform_or_defer_access_check (TYPE_BINFO (context
), tmpl
, tmpl
,
3963 return error_mark_node
;
3968 /* Build the UNBOUND_CLASS_TEMPLATE. */
3969 t
= cxx_make_type (UNBOUND_CLASS_TEMPLATE
);
3970 TYPE_CONTEXT (t
) = FROB_CONTEXT (context
);
3971 TREE_TYPE (t
) = NULL_TREE
;
3972 SET_TYPE_STRUCTURAL_EQUALITY (t
);
3974 /* Build the corresponding TEMPLATE_DECL. */
3975 d
= build_decl (input_location
, TEMPLATE_DECL
, name
, t
);
3976 TYPE_NAME (TREE_TYPE (d
)) = d
;
3977 TYPE_STUB_DECL (TREE_TYPE (d
)) = d
;
3978 DECL_CONTEXT (d
) = FROB_CONTEXT (context
);
3979 DECL_ARTIFICIAL (d
) = 1;
3980 DECL_TEMPLATE_PARMS (d
) = parm_list
;
3987 /* Push the declarations of builtin types into the global namespace.
3988 RID_INDEX is the index of the builtin type in the array
3989 RID_POINTERS. NAME is the name used when looking up the builtin
3990 type. TYPE is the _TYPE node for the builtin type.
3992 The calls to set_global_binding below should be
3993 eliminated. Built-in types should not be looked up name; their
3994 names are keywords that the parser can recognize. However, there
3995 is code in c-common.c that uses identifier_global_value to look up
3996 built-in types by name. */
3999 record_builtin_type (enum rid rid_index
,
4003 tree decl
= NULL_TREE
;
4007 tree tname
= get_identifier (name
);
4008 tree tdecl
= build_decl (BUILTINS_LOCATION
, TYPE_DECL
, tname
, type
);
4009 DECL_ARTIFICIAL (tdecl
) = 1;
4010 set_global_binding (tdecl
);
4014 if ((int) rid_index
< (int) RID_MAX
)
4015 if (tree rname
= ridpointers
[(int) rid_index
])
4016 if (!decl
|| DECL_NAME (decl
) != rname
)
4018 tree rdecl
= build_decl (BUILTINS_LOCATION
, TYPE_DECL
, rname
, type
);
4019 DECL_ARTIFICIAL (rdecl
) = 1;
4020 set_global_binding (rdecl
);
4027 if (!TYPE_NAME (type
))
4028 TYPE_NAME (type
) = decl
;
4029 debug_hooks
->type_decl (decl
, 0);
4033 /* Push a type into the namespace so that the back ends ignore it. */
4036 record_unknown_type (tree type
, const char* name
)
4038 tree decl
= pushdecl (build_decl (UNKNOWN_LOCATION
,
4039 TYPE_DECL
, get_identifier (name
), type
));
4040 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
4041 DECL_IGNORED_P (decl
) = 1;
4042 TYPE_DECL_SUPPRESS_DEBUG (decl
) = 1;
4043 TYPE_SIZE (type
) = TYPE_SIZE (void_type_node
);
4044 SET_TYPE_ALIGN (type
, 1);
4045 TYPE_USER_ALIGN (type
) = 0;
4046 SET_TYPE_MODE (type
, TYPE_MODE (void_type_node
));
4049 /* Create all the predefined identifiers. */
4052 initialize_predefined_identifiers (void)
4054 struct predefined_identifier
4056 const char *name
; /* Name. */
4057 tree
*node
; /* Node to store it in. */
4058 cp_identifier_kind kind
; /* Kind of identifier. */
4061 /* A table of identifiers to create at startup. */
4062 static const predefined_identifier predefined_identifiers
[] = {
4063 {"C++", &lang_name_cplusplus
, cik_normal
},
4064 {"C", &lang_name_c
, cik_normal
},
4065 /* Some of these names have a trailing space so that it is
4066 impossible for them to conflict with names written by users. */
4067 {"__ct ", &ctor_identifier
, cik_ctor
},
4068 {"__ct_base ", &base_ctor_identifier
, cik_ctor
},
4069 {"__ct_comp ", &complete_ctor_identifier
, cik_ctor
},
4070 {"__dt ", &dtor_identifier
, cik_dtor
},
4071 {"__dt_base ", &base_dtor_identifier
, cik_dtor
},
4072 {"__dt_comp ", &complete_dtor_identifier
, cik_dtor
},
4073 {"__dt_del ", &deleting_dtor_identifier
, cik_dtor
},
4074 {"__conv_op ", &conv_op_identifier
, cik_conv_op
},
4075 {"__in_chrg", &in_charge_identifier
, cik_normal
},
4076 {"this", &this_identifier
, cik_normal
},
4077 {"__delta", &delta_identifier
, cik_normal
},
4078 {"__pfn", &pfn_identifier
, cik_normal
},
4079 {"_vptr", &vptr_identifier
, cik_normal
},
4080 {"__vtt_parm", &vtt_parm_identifier
, cik_normal
},
4081 {"::", &global_identifier
, cik_normal
},
4082 {"std", &std_identifier
, cik_normal
},
4083 /* The demangler expects anonymous namespaces to be called
4084 something starting with '_GLOBAL__N_'. It no longer needs
4085 to be unique to the TU. */
4086 {"_GLOBAL__N_1", &anon_identifier
, cik_normal
},
4087 {"auto", &auto_identifier
, cik_normal
},
4088 {"decltype(auto)", &decltype_auto_identifier
, cik_normal
},
4089 {"initializer_list", &init_list_identifier
, cik_normal
},
4090 {"__for_range ", &for_range__identifier
, cik_normal
},
4091 {"__for_begin ", &for_begin__identifier
, cik_normal
},
4092 {"__for_end ", &for_end__identifier
, cik_normal
},
4093 {"__for_range", &for_range_identifier
, cik_normal
},
4094 {"__for_begin", &for_begin_identifier
, cik_normal
},
4095 {"__for_end", &for_end_identifier
, cik_normal
},
4096 {"abi_tag", &abi_tag_identifier
, cik_normal
},
4097 {"aligned", &aligned_identifier
, cik_normal
},
4098 {"begin", &begin_identifier
, cik_normal
},
4099 {"end", &end_identifier
, cik_normal
},
4100 {"get", &get__identifier
, cik_normal
},
4101 {"gnu", &gnu_identifier
, cik_normal
},
4102 {"tuple_element", &tuple_element_identifier
, cik_normal
},
4103 {"tuple_size", &tuple_size_identifier
, cik_normal
},
4104 {"type", &type_identifier
, cik_normal
},
4105 {"value", &value_identifier
, cik_normal
},
4106 {"_FUN", &fun_identifier
, cik_normal
},
4107 {"__closure", &closure_identifier
, cik_normal
},
4108 {NULL
, NULL
, cik_normal
}
4111 for (const predefined_identifier
*pid
= predefined_identifiers
;
4114 *pid
->node
= get_identifier (pid
->name
);
4115 /* Some of these identifiers already have a special kind. */
4116 if (pid
->kind
!= cik_normal
)
4117 set_identifier_kind (*pid
->node
, pid
->kind
);
4121 /* Create the predefined scalar types of C,
4122 and some nodes representing standard constants (0, 1, (void *)0).
4123 Initialize the global binding level.
4124 Make definitions for built-in primitive functions. */
4127 cxx_init_decl_processing (void)
4130 tree void_ftype_ptr
;
4132 /* Create all the identifiers we need. */
4133 initialize_predefined_identifiers ();
4135 /* Create the global variables. */
4136 push_to_top_level ();
4138 current_function_decl
= NULL_TREE
;
4139 current_binding_level
= NULL
;
4140 /* Enter the global namespace. */
4141 gcc_assert (global_namespace
== NULL_TREE
);
4142 global_namespace
= build_lang_decl (NAMESPACE_DECL
, global_identifier
,
4144 TREE_PUBLIC (global_namespace
) = 1;
4145 DECL_CONTEXT (global_namespace
)
4146 = build_translation_unit_decl (get_identifier (main_input_filename
));
4147 /* Remember whether we want the empty class passing ABI change warning
4149 TRANSLATION_UNIT_WARN_EMPTY_P (DECL_CONTEXT (global_namespace
))
4150 = warn_abi
&& abi_version_crosses (12);
4151 debug_hooks
->register_main_translation_unit
4152 (DECL_CONTEXT (global_namespace
));
4153 begin_scope (sk_namespace
, global_namespace
);
4154 current_namespace
= global_namespace
;
4156 if (flag_visibility_ms_compat
)
4157 default_visibility
= VISIBILITY_HIDDEN
;
4160 current_lang_name
= lang_name_c
;
4162 /* Create the `std' namespace. */
4163 push_namespace (std_identifier
);
4164 std_node
= current_namespace
;
4167 flag_noexcept_type
= (cxx_dialect
>= cxx17
);
4169 c_common_nodes_and_builtins ();
4171 tree bool_ftype
= build_function_type_list (boolean_type_node
, NULL_TREE
);
4173 = add_builtin_function ("__builtin_is_constant_evaluated",
4174 bool_ftype
, CP_BUILT_IN_IS_CONSTANT_EVALUATED
,
4175 BUILT_IN_FRONTEND
, NULL
, NULL_TREE
);
4176 set_call_expr_flags (decl
, ECF_CONST
| ECF_NOTHROW
| ECF_LEAF
);
4178 integer_two_node
= build_int_cst (NULL_TREE
, 2);
4180 /* Guess at the initial static decls size. */
4181 vec_alloc (static_decls
, 500);
4183 /* ... and keyed classes. */
4184 vec_alloc (keyed_classes
, 100);
4186 record_builtin_type (RID_BOOL
, "bool", boolean_type_node
);
4187 truthvalue_type_node
= boolean_type_node
;
4188 truthvalue_false_node
= boolean_false_node
;
4189 truthvalue_true_node
= boolean_true_node
;
4191 empty_except_spec
= build_tree_list (NULL_TREE
, NULL_TREE
);
4192 noexcept_true_spec
= build_tree_list (boolean_true_node
, NULL_TREE
);
4193 noexcept_false_spec
= build_tree_list (boolean_false_node
, NULL_TREE
);
4194 noexcept_deferred_spec
= build_tree_list (make_node (DEFERRED_NOEXCEPT
),
4198 record_builtin_type (RID_MAX
, NULL
, string_type_node
);
4201 delta_type_node
= ptrdiff_type_node
;
4202 vtable_index_type
= ptrdiff_type_node
;
4204 vtt_parm_type
= build_pointer_type (const_ptr_type_node
);
4205 void_ftype
= build_function_type_list (void_type_node
, NULL_TREE
);
4206 void_ftype_ptr
= build_function_type_list (void_type_node
,
4207 ptr_type_node
, NULL_TREE
);
4209 = build_exception_variant (void_ftype_ptr
, empty_except_spec
);
4211 /* Create the conversion operator marker. This operator's DECL_NAME
4212 is in the identifier table, so we can use identifier equality to
4214 conv_op_marker
= build_lang_decl (FUNCTION_DECL
, conv_op_identifier
,
4217 /* C++ extensions */
4219 unknown_type_node
= make_node (LANG_TYPE
);
4220 record_unknown_type (unknown_type_node
, "unknown type");
4222 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
4223 TREE_TYPE (unknown_type_node
) = unknown_type_node
;
4225 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
4227 TYPE_POINTER_TO (unknown_type_node
) = unknown_type_node
;
4228 TYPE_REFERENCE_TO (unknown_type_node
) = unknown_type_node
;
4230 init_list_type_node
= make_node (LANG_TYPE
);
4231 record_unknown_type (init_list_type_node
, "init list");
4234 /* Make sure we get a unique function type, so we can give
4235 its pointer type a name. (This wins for gdb.) */
4236 tree vfunc_type
= make_node (FUNCTION_TYPE
);
4237 TREE_TYPE (vfunc_type
) = integer_type_node
;
4238 TYPE_ARG_TYPES (vfunc_type
) = NULL_TREE
;
4239 layout_type (vfunc_type
);
4241 vtable_entry_type
= build_pointer_type (vfunc_type
);
4243 record_builtin_type (RID_MAX
, "__vtbl_ptr_type", vtable_entry_type
);
4246 = build_cplus_array_type (vtable_entry_type
, NULL_TREE
);
4247 layout_type (vtbl_type_node
);
4248 vtbl_type_node
= cp_build_qualified_type (vtbl_type_node
, TYPE_QUAL_CONST
);
4249 record_builtin_type (RID_MAX
, NULL
, vtbl_type_node
);
4250 vtbl_ptr_type_node
= build_pointer_type (vtable_entry_type
);
4251 layout_type (vtbl_ptr_type_node
);
4252 record_builtin_type (RID_MAX
, NULL
, vtbl_ptr_type_node
);
4254 push_namespace (get_identifier ("__cxxabiv1"));
4255 abi_node
= current_namespace
;
4258 global_type_node
= make_node (LANG_TYPE
);
4259 record_unknown_type (global_type_node
, "global type");
4261 any_targ_node
= make_node (LANG_TYPE
);
4262 record_unknown_type (any_targ_node
, "any type");
4265 current_lang_name
= lang_name_cplusplus
;
4267 if (aligned_new_threshold
> 1
4268 && !pow2p_hwi (aligned_new_threshold
))
4270 error ("-faligned-new=%d is not a power of two", aligned_new_threshold
);
4271 aligned_new_threshold
= 1;
4273 if (aligned_new_threshold
== -1)
4274 aligned_new_threshold
= (cxx_dialect
>= cxx17
) ? 1 : 0;
4275 if (aligned_new_threshold
== 1)
4276 aligned_new_threshold
= malloc_alignment () / BITS_PER_UNIT
;
4279 tree newattrs
, extvisattr
;
4280 tree newtype
, deltype
;
4281 tree ptr_ftype_sizetype
;
4285 = build_function_type_list (ptr_type_node
, size_type_node
, NULL_TREE
);
4286 if (cxx_dialect
== cxx98
)
4289 tree bad_alloc_type_node
;
4290 tree bad_alloc_decl
;
4292 push_namespace (std_identifier
);
4293 bad_alloc_id
= get_identifier ("bad_alloc");
4294 bad_alloc_type_node
= make_class_type (RECORD_TYPE
);
4295 TYPE_CONTEXT (bad_alloc_type_node
) = current_namespace
;
4297 = create_implicit_typedef (bad_alloc_id
, bad_alloc_type_node
);
4298 DECL_CONTEXT (bad_alloc_decl
) = current_namespace
;
4302 = add_exception_specifier (NULL_TREE
, bad_alloc_type_node
, -1);
4305 new_eh_spec
= noexcept_false_spec
;
4307 /* Ensure attribs.c is initialized. */
4310 /* Ensure constraint.cc is initialized. */
4311 init_constraint_processing ();
4313 extvisattr
= build_tree_list (get_identifier ("externally_visible"),
4315 newattrs
= tree_cons (get_identifier ("alloc_size"),
4316 build_tree_list (NULL_TREE
, integer_one_node
),
4318 newtype
= cp_build_type_attribute_variant (ptr_ftype_sizetype
, newattrs
);
4319 newtype
= build_exception_variant (newtype
, new_eh_spec
);
4320 deltype
= cp_build_type_attribute_variant (void_ftype_ptr
, extvisattr
);
4321 deltype
= build_exception_variant (deltype
, empty_except_spec
);
4322 tree opnew
= push_cp_library_fn (NEW_EXPR
, newtype
, 0);
4323 DECL_IS_MALLOC (opnew
) = 1;
4324 DECL_IS_OPERATOR_NEW (opnew
) = 1;
4325 opnew
= push_cp_library_fn (VEC_NEW_EXPR
, newtype
, 0);
4326 DECL_IS_MALLOC (opnew
) = 1;
4327 DECL_IS_OPERATOR_NEW (opnew
) = 1;
4328 push_cp_library_fn (DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4329 push_cp_library_fn (VEC_DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4330 if (flag_sized_deallocation
)
4332 /* Also push the sized deallocation variants:
4333 void operator delete(void*, std::size_t) throw();
4334 void operator delete[](void*, std::size_t) throw(); */
4335 tree void_ftype_ptr_size
4336 = build_function_type_list (void_type_node
, ptr_type_node
,
4337 size_type_node
, NULL_TREE
);
4338 deltype
= cp_build_type_attribute_variant (void_ftype_ptr_size
,
4340 deltype
= build_exception_variant (deltype
, empty_except_spec
);
4341 push_cp_library_fn (DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4342 push_cp_library_fn (VEC_DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4345 if (aligned_new_threshold
)
4347 push_namespace (std_identifier
);
4348 tree align_id
= get_identifier ("align_val_t");
4349 align_type_node
= start_enum (align_id
, NULL_TREE
, size_type_node
,
4350 NULL_TREE
, /*scoped*/true, NULL
);
4353 /* operator new (size_t, align_val_t); */
4354 newtype
= build_function_type_list (ptr_type_node
, size_type_node
,
4355 align_type_node
, NULL_TREE
);
4356 newtype
= cp_build_type_attribute_variant (newtype
, newattrs
);
4357 newtype
= build_exception_variant (newtype
, new_eh_spec
);
4358 opnew
= push_cp_library_fn (NEW_EXPR
, newtype
, 0);
4359 DECL_IS_MALLOC (opnew
) = 1;
4360 DECL_IS_OPERATOR_NEW (opnew
) = 1;
4361 opnew
= push_cp_library_fn (VEC_NEW_EXPR
, newtype
, 0);
4362 DECL_IS_MALLOC (opnew
) = 1;
4363 DECL_IS_OPERATOR_NEW (opnew
) = 1;
4365 /* operator delete (void *, align_val_t); */
4366 deltype
= build_function_type_list (void_type_node
, ptr_type_node
,
4367 align_type_node
, NULL_TREE
);
4368 deltype
= cp_build_type_attribute_variant (deltype
, extvisattr
);
4369 deltype
= build_exception_variant (deltype
, empty_except_spec
);
4370 push_cp_library_fn (DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4371 push_cp_library_fn (VEC_DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4373 if (flag_sized_deallocation
)
4375 /* operator delete (void *, size_t, align_val_t); */
4376 deltype
= build_function_type_list (void_type_node
, ptr_type_node
,
4377 size_type_node
, align_type_node
,
4379 deltype
= cp_build_type_attribute_variant (deltype
, extvisattr
);
4380 deltype
= build_exception_variant (deltype
, empty_except_spec
);
4381 push_cp_library_fn (DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4382 push_cp_library_fn (VEC_DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4386 nullptr_type_node
= make_node (NULLPTR_TYPE
);
4387 TYPE_SIZE (nullptr_type_node
) = bitsize_int (GET_MODE_BITSIZE (ptr_mode
));
4388 TYPE_SIZE_UNIT (nullptr_type_node
) = size_int (GET_MODE_SIZE (ptr_mode
));
4389 TYPE_UNSIGNED (nullptr_type_node
) = 1;
4390 TYPE_PRECISION (nullptr_type_node
) = GET_MODE_BITSIZE (ptr_mode
);
4391 if (abi_version_at_least (9))
4392 SET_TYPE_ALIGN (nullptr_type_node
, GET_MODE_ALIGNMENT (ptr_mode
));
4393 SET_TYPE_MODE (nullptr_type_node
, ptr_mode
);
4394 record_builtin_type (RID_MAX
, "decltype(nullptr)", nullptr_type_node
);
4395 nullptr_node
= build_int_cst (nullptr_type_node
, 0);
4399 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype
,
4400 ECF_NORETURN
| ECF_NOTHROW
| ECF_COLD
);
4402 /* Perform other language dependent initializations. */
4403 init_class_processing ();
4404 init_rtti_processing ();
4405 init_template_processing ();
4407 if (flag_exceptions
)
4408 init_exception_processing ();
4410 if (! supports_one_only ())
4413 make_fname_decl
= cp_make_fname_decl
;
4414 start_fname_decls ();
4416 /* Show we use EH for cleanups. */
4417 if (flag_exceptions
)
4418 using_eh_for_cleanups ();
4421 /* Generate an initializer for a function naming variable from
4422 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
4423 filled in with the type of the init. */
4426 cp_fname_init (const char* name
, tree
*type_p
)
4428 tree domain
= NULL_TREE
;
4430 tree init
= NULL_TREE
;
4435 length
= strlen (name
);
4436 domain
= build_index_type (size_int (length
));
4437 init
= build_string (length
+ 1, name
);
4440 type
= cp_build_qualified_type (char_type_node
, TYPE_QUAL_CONST
);
4441 type
= build_cplus_array_type (type
, domain
);
4446 TREE_TYPE (init
) = type
;
4448 init
= error_mark_node
;
4453 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
4454 the decl, LOC is the location to give the decl, NAME is the
4455 initialization string and TYPE_DEP indicates whether NAME depended
4456 on the type of the function. We make use of that to detect
4457 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
4458 at the point of first use, so we mustn't push the decl now. */
4461 cp_make_fname_decl (location_t loc
, tree id
, int type_dep
)
4463 const char *const name
= (type_dep
&& in_template_function ()
4464 ? NULL
: fname_as_string (type_dep
));
4466 tree init
= cp_fname_init (name
, &type
);
4467 tree decl
= build_decl (loc
, VAR_DECL
, id
, type
);
4470 free (CONST_CAST (char *, name
));
4472 /* As we're using pushdecl_with_scope, we must set the context. */
4473 DECL_CONTEXT (decl
) = current_function_decl
;
4475 TREE_READONLY (decl
) = 1;
4476 DECL_ARTIFICIAL (decl
) = 1;
4477 DECL_DECLARED_CONSTEXPR_P (decl
) = 1;
4478 TREE_STATIC (decl
) = 1;
4480 TREE_USED (decl
) = 1;
4484 SET_DECL_VALUE_EXPR (decl
, init
);
4485 DECL_HAS_VALUE_EXPR_P (decl
) = 1;
4486 /* For decl_constant_var_p. */
4487 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
) = 1;
4490 if (current_function_decl
)
4492 DECL_CONTEXT (decl
) = current_function_decl
;
4493 decl
= pushdecl_outermost_localscope (decl
);
4494 if (decl
!= error_mark_node
)
4495 add_decl_expr (decl
);
4499 DECL_THIS_STATIC (decl
) = true;
4500 pushdecl_top_level_and_finish (decl
, NULL_TREE
);
4507 builtin_function_1 (tree decl
, tree context
, bool is_global
)
4509 tree id
= DECL_NAME (decl
);
4510 const char *name
= IDENTIFIER_POINTER (id
);
4512 retrofit_lang_decl (decl
);
4514 DECL_ARTIFICIAL (decl
) = 1;
4515 SET_DECL_LANGUAGE (decl
, lang_c
);
4516 /* Runtime library routines are, by definition, available in an
4517 external shared object. */
4518 DECL_VISIBILITY (decl
) = VISIBILITY_DEFAULT
;
4519 DECL_VISIBILITY_SPECIFIED (decl
) = 1;
4521 DECL_CONTEXT (decl
) = context
;
4523 /* A function in the user's namespace should have an explicit
4524 declaration before it is used. Mark the built-in function as
4525 anticipated but not actually declared. */
4526 if (name
[0] != '_' || name
[1] != '_')
4527 DECL_ANTICIPATED (decl
) = 1;
4528 else if (strncmp (name
+ 2, "builtin_", strlen ("builtin_")) != 0)
4530 size_t len
= strlen (name
);
4532 /* Treat __*_chk fortification functions as anticipated as well,
4533 unless they are __builtin_*. */
4534 if (len
> strlen ("___chk")
4535 && memcmp (name
+ len
- strlen ("_chk"),
4536 "_chk", strlen ("_chk") + 1) == 0)
4537 DECL_ANTICIPATED (decl
) = 1;
4541 return pushdecl_top_level (decl
);
4543 return pushdecl (decl
);
4547 cxx_builtin_function (tree decl
)
4549 tree id
= DECL_NAME (decl
);
4550 const char *name
= IDENTIFIER_POINTER (id
);
4551 /* All builtins that don't begin with an '_' should additionally
4552 go in the 'std' namespace. */
4555 tree decl2
= copy_node(decl
);
4556 push_namespace (std_identifier
);
4557 builtin_function_1 (decl2
, std_node
, false);
4561 return builtin_function_1 (decl
, NULL_TREE
, false);
4564 /* Like cxx_builtin_function, but guarantee the function is added to the global
4565 scope. This is to allow function specific options to add new machine
4566 dependent builtins when the target ISA changes via attribute((target(...)))
4567 which saves space on program startup if the program does not use non-generic
4571 cxx_builtin_function_ext_scope (tree decl
)
4574 tree id
= DECL_NAME (decl
);
4575 const char *name
= IDENTIFIER_POINTER (id
);
4576 /* All builtins that don't begin with an '_' should additionally
4577 go in the 'std' namespace. */
4580 tree decl2
= copy_node(decl
);
4581 push_namespace (std_identifier
);
4582 builtin_function_1 (decl2
, std_node
, true);
4586 return builtin_function_1 (decl
, NULL_TREE
, true);
4589 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
4590 function. Not called directly. */
4593 build_library_fn (tree name
, enum tree_code operator_code
, tree type
,
4596 tree fn
= build_lang_decl (FUNCTION_DECL
, name
, type
);
4597 DECL_EXTERNAL (fn
) = 1;
4598 TREE_PUBLIC (fn
) = 1;
4599 DECL_ARTIFICIAL (fn
) = 1;
4600 DECL_OVERLOADED_OPERATOR_CODE_RAW (fn
)
4601 = OVL_OP_INFO (false, operator_code
)->ovl_op_code
;
4602 SET_DECL_LANGUAGE (fn
, lang_c
);
4603 /* Runtime library routines are, by definition, available in an
4604 external shared object. */
4605 DECL_VISIBILITY (fn
) = VISIBILITY_DEFAULT
;
4606 DECL_VISIBILITY_SPECIFIED (fn
) = 1;
4607 set_call_expr_flags (fn
, ecf_flags
);
4611 /* Returns the _DECL for a library function with C++ linkage. */
4614 build_cp_library_fn (tree name
, enum tree_code operator_code
, tree type
,
4617 tree fn
= build_library_fn (name
, operator_code
, type
, ecf_flags
);
4618 DECL_CONTEXT (fn
) = FROB_CONTEXT (current_namespace
);
4619 SET_DECL_LANGUAGE (fn
, lang_cplusplus
);
4623 /* Like build_library_fn, but takes a C string instead of an
4627 build_library_fn_ptr (const char* name
, tree type
, int ecf_flags
)
4629 return build_library_fn (get_identifier (name
), ERROR_MARK
, type
, ecf_flags
);
4632 /* Like build_cp_library_fn, but takes a C string instead of an
4636 build_cp_library_fn_ptr (const char* name
, tree type
, int ecf_flags
)
4638 return build_cp_library_fn (get_identifier (name
), ERROR_MARK
, type
,
4642 /* Like build_library_fn, but also pushes the function so that we will
4643 be able to find it via get_global_binding. Also, the function
4644 may throw exceptions listed in RAISES. */
4647 push_library_fn (tree name
, tree type
, tree raises
, int ecf_flags
)
4652 type
= build_exception_variant (type
, raises
);
4654 fn
= build_library_fn (name
, ERROR_MARK
, type
, ecf_flags
);
4655 pushdecl_top_level (fn
);
4659 /* Like build_cp_library_fn, but also pushes the function so that it
4660 will be found by normal lookup. */
4663 push_cp_library_fn (enum tree_code operator_code
, tree type
,
4666 tree fn
= build_cp_library_fn (ovl_op_identifier (false, operator_code
),
4667 operator_code
, type
, ecf_flags
);
4670 apply_tm_attr (fn
, get_identifier ("transaction_safe"));
4674 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
4678 push_void_library_fn (tree name
, tree parmtypes
, int ecf_flags
)
4680 tree type
= build_function_type (void_type_node
, parmtypes
);
4681 return push_library_fn (name
, type
, NULL_TREE
, ecf_flags
);
4684 /* Like push_library_fn, but also note that this function throws
4685 and does not return. Used for __throw_foo and the like. */
4688 push_throw_library_fn (tree name
, tree type
)
4690 tree fn
= push_library_fn (name
, type
, NULL_TREE
, ECF_NORETURN
| ECF_COLD
);
4694 /* When we call finish_struct for an anonymous union, we create
4695 default copy constructors and such. But, an anonymous union
4696 shouldn't have such things; this function undoes the damage to the
4697 anonymous union type T.
4699 (The reason that we create the synthesized methods is that we don't
4700 distinguish `union { int i; }' from `typedef union { int i; } U'.
4701 The first is an anonymous union; the second is just an ordinary
4705 fixup_anonymous_aggr (tree t
)
4707 /* Wipe out memory of synthesized methods. */
4708 TYPE_HAS_USER_CONSTRUCTOR (t
) = 0;
4709 TYPE_HAS_DEFAULT_CONSTRUCTOR (t
) = 0;
4710 TYPE_HAS_COPY_CTOR (t
) = 0;
4711 TYPE_HAS_CONST_COPY_CTOR (t
) = 0;
4712 TYPE_HAS_COPY_ASSIGN (t
) = 0;
4713 TYPE_HAS_CONST_COPY_ASSIGN (t
) = 0;
4715 /* Splice the implicitly generated functions out of TYPE_FIELDS. */
4716 for (tree probe
, *prev_p
= &TYPE_FIELDS (t
); (probe
= *prev_p
);)
4717 if (TREE_CODE (probe
) == FUNCTION_DECL
&& DECL_ARTIFICIAL (probe
))
4718 *prev_p
= DECL_CHAIN (probe
);
4720 prev_p
= &DECL_CHAIN (probe
);
4722 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
4723 assignment operators (because they cannot have these methods themselves).
4724 For anonymous unions this is already checked because they are not allowed
4725 in any union, otherwise we have to check it. */
4726 if (TREE_CODE (t
) != UNION_TYPE
)
4730 for (field
= TYPE_FIELDS (t
); field
; field
= DECL_CHAIN (field
))
4731 if (TREE_CODE (field
) == FIELD_DECL
)
4733 type
= TREE_TYPE (field
);
4734 if (CLASS_TYPE_P (type
))
4736 if (TYPE_NEEDS_CONSTRUCTING (type
))
4737 error ("member %q+#D with constructor not allowed "
4738 "in anonymous aggregate", field
);
4739 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
))
4740 error ("member %q+#D with destructor not allowed "
4741 "in anonymous aggregate", field
);
4742 if (TYPE_HAS_COMPLEX_COPY_ASSIGN (type
))
4743 error ("member %q+#D with copy assignment operator "
4744 "not allowed in anonymous aggregate", field
);
4750 /* Warn for an attribute located at LOCATION that appertains to the
4751 class type CLASS_TYPE that has not been properly placed after its
4752 class-key, in it class-specifier. */
4755 warn_misplaced_attr_for_class_type (location_t location
,
4758 gcc_assert (OVERLOAD_TYPE_P (class_type
));
4760 auto_diagnostic_group d
;
4761 if (warning_at (location
, OPT_Wattributes
,
4762 "attribute ignored in declaration "
4763 "of %q#T", class_type
))
4765 "attribute for %q#T must follow the %qs keyword",
4766 class_type
, class_key_or_enum_as_string (class_type
));
4769 /* Make sure that a declaration with no declarator is well-formed, i.e.
4770 just declares a tagged type or anonymous union.
4772 Returns the type declared; or NULL_TREE if none. */
4775 check_tag_decl (cp_decl_specifier_seq
*declspecs
,
4776 bool explicit_type_instantiation_p
)
4778 int saw_friend
= decl_spec_seq_has_spec_p (declspecs
, ds_friend
);
4779 int saw_typedef
= decl_spec_seq_has_spec_p (declspecs
, ds_typedef
);
4780 /* If a class, struct, or enum type is declared by the DECLSPECS
4781 (i.e, if a class-specifier, enum-specifier, or non-typename
4782 elaborated-type-specifier appears in the DECLSPECS),
4783 DECLARED_TYPE is set to the corresponding type. */
4784 tree declared_type
= NULL_TREE
;
4785 bool error_p
= false;
4787 if (declspecs
->multiple_types_p
)
4788 error ("multiple types in one declaration");
4789 else if (declspecs
->redefined_builtin_type
)
4791 if (!in_system_header_at (input_location
))
4792 permerror (declspecs
->locations
[ds_redefined_builtin_type_spec
],
4793 "redeclaration of C++ built-in type %qT",
4794 declspecs
->redefined_builtin_type
);
4799 && TYPE_P (declspecs
->type
)
4800 && ((TREE_CODE (declspecs
->type
) != TYPENAME_TYPE
4801 && MAYBE_CLASS_TYPE_P (declspecs
->type
))
4802 || TREE_CODE (declspecs
->type
) == ENUMERAL_TYPE
))
4803 declared_type
= declspecs
->type
;
4804 else if (declspecs
->type
== error_mark_node
)
4807 if (type_uses_auto (declared_type
))
4809 error_at (declspecs
->locations
[ds_type_spec
],
4810 "%<auto%> can only be specified for variables "
4811 "or function declarations");
4812 return error_mark_node
;
4815 if (declared_type
&& !OVERLOAD_TYPE_P (declared_type
))
4816 declared_type
= NULL_TREE
;
4818 if (!declared_type
&& !saw_friend
&& !error_p
)
4819 permerror (input_location
, "declaration does not declare anything");
4820 /* Check for an anonymous union. */
4821 else if (declared_type
&& RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type
))
4822 && TYPE_UNNAMED_P (declared_type
))
4824 /* 7/3 In a simple-declaration, the optional init-declarator-list
4825 can be omitted only when declaring a class (clause 9) or
4826 enumeration (7.2), that is, when the decl-specifier-seq contains
4827 either a class-specifier, an elaborated-type-specifier with
4828 a class-key (9.1), or an enum-specifier. In these cases and
4829 whenever a class-specifier or enum-specifier is present in the
4830 decl-specifier-seq, the identifiers in these specifiers are among
4831 the names being declared by the declaration (as class-name,
4832 enum-names, or enumerators, depending on the syntax). In such
4833 cases, and except for the declaration of an unnamed bit-field (9.6),
4834 the decl-specifier-seq shall introduce one or more names into the
4835 program, or shall redeclare a name introduced by a previous
4836 declaration. [Example:
4837 enum { }; // ill-formed
4838 typedef class { }; // ill-formed
4842 error ("missing type-name in typedef-declaration");
4845 /* Anonymous unions are objects, so they can have specifiers. */;
4846 SET_ANON_AGGR_TYPE_P (declared_type
);
4848 if (TREE_CODE (declared_type
) != UNION_TYPE
4849 && !in_system_header_at (input_location
))
4850 pedwarn (input_location
, OPT_Wpedantic
, "ISO C++ prohibits anonymous structs");
4855 if (decl_spec_seq_has_spec_p (declspecs
, ds_inline
))
4856 error_at (declspecs
->locations
[ds_inline
],
4857 "%<inline%> can only be specified for functions");
4858 else if (decl_spec_seq_has_spec_p (declspecs
, ds_virtual
))
4859 error_at (declspecs
->locations
[ds_virtual
],
4860 "%<virtual%> can only be specified for functions");
4862 && (!current_class_type
4863 || current_scope () != current_class_type
))
4864 error_at (declspecs
->locations
[ds_friend
],
4865 "%<friend%> can only be specified inside a class");
4866 else if (decl_spec_seq_has_spec_p (declspecs
, ds_explicit
))
4867 error_at (declspecs
->locations
[ds_explicit
],
4868 "%<explicit%> can only be specified for constructors");
4869 else if (declspecs
->storage_class
)
4870 error_at (declspecs
->locations
[ds_storage_class
],
4871 "a storage class can only be specified for objects "
4873 else if (decl_spec_seq_has_spec_p (declspecs
, ds_const
))
4874 error_at (declspecs
->locations
[ds_const
],
4875 "%<const%> can only be specified for objects and "
4877 else if (decl_spec_seq_has_spec_p (declspecs
, ds_volatile
))
4878 error_at (declspecs
->locations
[ds_volatile
],
4879 "%<volatile%> can only be specified for objects and "
4881 else if (decl_spec_seq_has_spec_p (declspecs
, ds_restrict
))
4882 error_at (declspecs
->locations
[ds_restrict
],
4883 "%<__restrict%> can only be specified for objects and "
4885 else if (decl_spec_seq_has_spec_p (declspecs
, ds_thread
))
4886 error_at (declspecs
->locations
[ds_thread
],
4887 "%<__thread%> can only be specified for objects "
4889 else if (saw_typedef
)
4890 warning_at (declspecs
->locations
[ds_typedef
], 0,
4891 "%<typedef%> was ignored in this declaration");
4892 else if (decl_spec_seq_has_spec_p (declspecs
, ds_constexpr
))
4893 error_at (declspecs
->locations
[ds_constexpr
],
4894 "%<constexpr%> cannot be used for type declarations");
4897 if (declspecs
->attributes
&& warn_attributes
&& declared_type
)
4900 if (!CLASS_TYPE_P (declared_type
)
4901 || !CLASSTYPE_TEMPLATE_INSTANTIATION (declared_type
))
4902 /* For a non-template class, use the name location. */
4903 loc
= location_of (declared_type
);
4905 /* For a template class (an explicit instantiation), use the
4906 current location. */
4907 loc
= input_location
;
4909 if (explicit_type_instantiation_p
)
4910 /* [dcl.attr.grammar]/4:
4912 No attribute-specifier-seq shall appertain to an explicit
4915 if (warning_at (loc
, OPT_Wattributes
,
4916 "attribute ignored in explicit instantiation %q#T",
4919 "no attribute can be applied to "
4920 "an explicit instantiation");
4923 warn_misplaced_attr_for_class_type (loc
, declared_type
);
4926 return declared_type
;
4929 /* Called when a declaration is seen that contains no names to declare.
4930 If its type is a reference to a structure, union or enum inherited
4931 from a containing scope, shadow that tag name for the current scope
4932 with a forward reference.
4933 If its type defines a new named structure or union
4934 or defines an enum, it is valid but we need not do anything here.
4935 Otherwise, it is an error.
4937 C++: may have to grok the declspecs to learn about static,
4938 complain for anonymous unions.
4940 Returns the TYPE declared -- or NULL_TREE if none. */
4943 shadow_tag (cp_decl_specifier_seq
*declspecs
)
4945 tree t
= check_tag_decl (declspecs
,
4946 /*explicit_type_instantiation_p=*/false);
4951 if (maybe_process_partial_specialization (t
) == error_mark_node
)
4954 /* This is where the variables in an anonymous union are
4955 declared. An anonymous union declaration looks like:
4957 because there is no declarator after the union, the parser
4958 sends that declaration here. */
4959 if (ANON_AGGR_TYPE_P (t
))
4961 fixup_anonymous_aggr (t
);
4963 if (TYPE_FIELDS (t
))
4965 tree decl
= grokdeclarator (/*declarator=*/NULL
,
4966 declspecs
, NORMAL
, 0, NULL
);
4967 finish_anon_union (decl
);
4974 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4977 groktypename (cp_decl_specifier_seq
*type_specifiers
,
4978 const cp_declarator
*declarator
,
4979 bool is_template_arg
)
4983 enum decl_context context
4984 = is_template_arg
? TEMPLATE_TYPE_ARG
: TYPENAME
;
4985 attrs
= type_specifiers
->attributes
;
4986 type_specifiers
->attributes
= NULL_TREE
;
4987 type
= grokdeclarator (declarator
, type_specifiers
, context
, 0, &attrs
);
4988 if (attrs
&& type
!= error_mark_node
)
4990 if (CLASS_TYPE_P (type
))
4991 warning (OPT_Wattributes
, "ignoring attributes applied to class type %qT "
4992 "outside of definition", type
);
4993 else if (MAYBE_CLASS_TYPE_P (type
))
4994 /* A template type parameter or other dependent type. */
4995 warning (OPT_Wattributes
, "ignoring attributes applied to dependent "
4996 "type %qT without an associated declaration", type
);
4998 cplus_decl_attributes (&type
, attrs
, 0);
5003 /* Process a DECLARATOR for a function-scope variable declaration,
5004 namespace-scope variable declaration, or function declaration.
5005 (Function definitions go through start_function; class member
5006 declarations appearing in the body of the class go through
5007 grokfield.) The DECL corresponding to the DECLARATOR is returned.
5008 If an error occurs, the error_mark_node is returned instead.
5010 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
5011 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
5012 for an explicitly defaulted function, or SD_DELETED for an explicitly
5013 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
5014 implicitly initialized via a default constructor. ATTRIBUTES and
5015 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
5017 The scope represented by the context of the returned DECL is pushed
5018 (if it is not the global namespace) and is assigned to
5019 *PUSHED_SCOPE_P. The caller is then responsible for calling
5020 pop_scope on *PUSHED_SCOPE_P if it is set. */
5023 start_decl (const cp_declarator
*declarator
,
5024 cp_decl_specifier_seq
*declspecs
,
5027 tree prefix_attributes
,
5028 tree
*pushed_scope_p
)
5036 *pushed_scope_p
= NULL_TREE
;
5038 /* An object declared as __attribute__((deprecated)) suppresses
5039 warnings of uses of other deprecated items. */
5040 if (lookup_attribute ("deprecated", attributes
))
5041 deprecated_state
= DEPRECATED_SUPPRESS
;
5043 attributes
= chainon (attributes
, prefix_attributes
);
5045 decl
= grokdeclarator (declarator
, declspecs
, NORMAL
, initialized
,
5048 deprecated_state
= DEPRECATED_NORMAL
;
5050 if (decl
== NULL_TREE
|| VOID_TYPE_P (decl
)
5051 || decl
== error_mark_node
)
5052 return error_mark_node
;
5054 context
= CP_DECL_CONTEXT (decl
);
5055 if (context
!= global_namespace
)
5056 *pushed_scope_p
= push_scope (context
);
5058 /* Is it valid for this decl to have an initializer at all?
5059 If not, set INITIALIZED to zero, which will indirectly
5060 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
5062 && TREE_CODE (decl
) == TYPE_DECL
)
5064 error_at (DECL_SOURCE_LOCATION (decl
),
5065 "typedef %qD is initialized (use decltype instead)", decl
);
5066 return error_mark_node
;
5071 if (! toplevel_bindings_p ()
5072 && DECL_EXTERNAL (decl
))
5073 warning (0, "declaration of %q#D has %<extern%> and is initialized",
5075 DECL_EXTERNAL (decl
) = 0;
5076 if (toplevel_bindings_p ())
5077 TREE_STATIC (decl
) = 1;
5079 alias
= lookup_attribute ("alias", DECL_ATTRIBUTES (decl
)) != 0;
5081 if (alias
&& TREE_CODE (decl
) == FUNCTION_DECL
)
5082 record_key_method_defined (decl
);
5084 /* If this is a typedef that names the class for linkage purposes
5085 (7.1.3p8), apply any attributes directly to the type. */
5086 if (TREE_CODE (decl
) == TYPE_DECL
5087 && OVERLOAD_TYPE_P (TREE_TYPE (decl
))
5088 && decl
== TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl
))))
5089 flags
= ATTR_FLAG_TYPE_IN_PLACE
;
5093 /* Set attributes here so if duplicate decl, will have proper attributes. */
5094 cplus_decl_attributes (&decl
, attributes
, flags
);
5096 /* Dllimported symbols cannot be defined. Static data members (which
5097 can be initialized in-class and dllimported) go through grokfield,
5098 not here, so we don't need to exclude those decls when checking for
5100 if (initialized
&& DECL_DLLIMPORT_P (decl
))
5102 error_at (DECL_SOURCE_LOCATION (decl
),
5103 "definition of %q#D is marked %<dllimport%>", decl
);
5104 DECL_DLLIMPORT_P (decl
) = 0;
5107 /* If #pragma weak was used, mark the decl weak now. */
5108 if (!processing_template_decl
&& !DECL_DECOMPOSITION_P (decl
))
5109 maybe_apply_pragma_weak (decl
);
5111 if (TREE_CODE (decl
) == FUNCTION_DECL
5112 && DECL_DECLARED_INLINE_P (decl
)
5113 && DECL_UNINLINABLE (decl
)
5114 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl
)))
5115 warning_at (DECL_SOURCE_LOCATION (decl
), 0,
5116 "inline function %qD given attribute noinline", decl
);
5118 if (TYPE_P (context
) && COMPLETE_TYPE_P (complete_type (context
)))
5120 bool this_tmpl
= (processing_template_decl
5121 > template_class_depth (context
));
5124 tree field
= lookup_field (context
, DECL_NAME (decl
), 0, false);
5125 if (field
== NULL_TREE
5126 || !(VAR_P (field
) || variable_template_p (field
)))
5127 error ("%q+#D is not a static data member of %q#T", decl
, context
);
5128 else if (variable_template_p (field
)
5129 && (DECL_LANG_SPECIFIC (decl
)
5130 && DECL_TEMPLATE_SPECIALIZATION (decl
)))
5131 /* OK, specialization was already checked. */;
5132 else if (variable_template_p (field
) && !this_tmpl
)
5134 error_at (DECL_SOURCE_LOCATION (decl
),
5135 "non-member-template declaration of %qD", decl
);
5136 inform (DECL_SOURCE_LOCATION (field
), "does not match "
5137 "member template declaration here");
5138 return error_mark_node
;
5142 if (variable_template_p (field
))
5143 field
= DECL_TEMPLATE_RESULT (field
);
5145 if (DECL_CONTEXT (field
) != context
)
5147 if (!same_type_p (DECL_CONTEXT (field
), context
))
5148 permerror (input_location
, "ISO C++ does not permit %<%T::%D%> "
5149 "to be defined as %<%T::%D%>",
5150 DECL_CONTEXT (field
), DECL_NAME (decl
),
5151 context
, DECL_NAME (decl
));
5152 DECL_CONTEXT (decl
) = DECL_CONTEXT (field
);
5154 /* Static data member are tricky; an in-class initialization
5155 still doesn't provide a definition, so the in-class
5156 declaration will have DECL_EXTERNAL set, but will have an
5157 initialization. Thus, duplicate_decls won't warn
5158 about this situation, and so we check here. */
5159 if (initialized
&& DECL_INITIALIZED_IN_CLASS_P (field
))
5160 error ("duplicate initialization of %qD", decl
);
5161 field
= duplicate_decls (decl
, field
,
5162 /*newdecl_is_friend=*/false);
5163 if (field
== error_mark_node
)
5164 return error_mark_node
;
5171 tree field
= check_classfn (context
, decl
,
5173 ? current_template_parms
5175 if (field
&& field
!= error_mark_node
5176 && duplicate_decls (decl
, field
,
5177 /*newdecl_is_friend=*/false))
5181 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
5182 DECL_IN_AGGR_P (decl
) = 0;
5183 /* Do not mark DECL as an explicit specialization if it was not
5184 already marked as an instantiation; a declaration should
5185 never be marked as a specialization unless we know what
5186 template is being specialized. */
5187 if (DECL_LANG_SPECIFIC (decl
) && DECL_USE_TEMPLATE (decl
))
5189 SET_DECL_TEMPLATE_SPECIALIZATION (decl
);
5190 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5191 DECL_COMDAT (decl
) = (TREE_PUBLIC (decl
)
5192 && DECL_DECLARED_INLINE_P (decl
));
5194 DECL_COMDAT (decl
) = false;
5196 /* [temp.expl.spec] An explicit specialization of a static data
5197 member of a template is a definition if the declaration
5198 includes an initializer; otherwise, it is a declaration.
5200 We check for processing_specialization so this only applies
5201 to the new specialization syntax. */
5202 if (!initialized
&& processing_specialization
)
5203 DECL_EXTERNAL (decl
) = 1;
5206 if (DECL_EXTERNAL (decl
) && ! DECL_TEMPLATE_SPECIALIZATION (decl
)
5207 /* Aliases are definitions. */
5209 permerror (declarator
->id_loc
,
5210 "declaration of %q#D outside of class is not definition",
5214 was_public
= TREE_PUBLIC (decl
);
5216 /* Enter this declaration into the symbol table. Don't push the plain
5217 VAR_DECL for a variable template. */
5218 if (!template_parm_scope_p ()
5220 decl
= maybe_push_decl (decl
);
5222 if (processing_template_decl
)
5223 decl
= push_template_decl (decl
);
5224 if (decl
== error_mark_node
)
5225 return error_mark_node
;
5228 && DECL_NAMESPACE_SCOPE_P (decl
) && !TREE_PUBLIC (decl
) && !was_public
5229 && !DECL_THIS_STATIC (decl
) && !DECL_ARTIFICIAL (decl
))
5231 /* This is a const variable with implicit 'static'. Set
5232 DECL_THIS_STATIC so we can tell it from variables that are
5233 !TREE_PUBLIC because of the anonymous namespace. */
5234 gcc_assert (CP_TYPE_CONST_P (TREE_TYPE (decl
)) || errorcount
);
5235 DECL_THIS_STATIC (decl
) = 1;
5238 if (current_function_decl
&& VAR_P (decl
)
5239 && DECL_DECLARED_CONSTEXPR_P (current_function_decl
))
5242 if (CP_DECL_THREAD_LOCAL_P (decl
))
5243 error_at (DECL_SOURCE_LOCATION (decl
),
5244 "%qD declared %<thread_local%> in %<constexpr%> function",
5246 else if (TREE_STATIC (decl
))
5247 error_at (DECL_SOURCE_LOCATION (decl
),
5248 "%qD declared %<static%> in %<constexpr%> function", decl
);
5252 cp_function_chain
->invalid_constexpr
= true;
5255 if (!processing_template_decl
&& VAR_P (decl
))
5256 start_decl_1 (decl
, initialized
);
5261 /* Process the declaration of a variable DECL. INITIALIZED is true
5262 iff DECL is explicitly initialized. (INITIALIZED is false if the
5263 variable is initialized via an implicitly-called constructor.)
5264 This function must be called for ordinary variables (including, for
5265 example, implicit instantiations of templates), but must not be
5266 called for template declarations. */
5269 start_decl_1 (tree decl
, bool initialized
)
5273 bool aggregate_definition_p
;
5275 gcc_assert (!processing_template_decl
);
5277 if (error_operand_p (decl
))
5280 gcc_assert (VAR_P (decl
));
5282 type
= TREE_TYPE (decl
);
5283 complete_p
= COMPLETE_TYPE_P (type
);
5284 aggregate_definition_p
= MAYBE_CLASS_TYPE_P (type
) && !DECL_EXTERNAL (decl
);
5286 /* If an explicit initializer is present, or if this is a definition
5287 of an aggregate, then we need a complete type at this point.
5288 (Scalars are always complete types, so there is nothing to
5289 check.) This code just sets COMPLETE_P; errors (if necessary)
5290 are issued below. */
5291 if ((initialized
|| aggregate_definition_p
)
5293 && COMPLETE_TYPE_P (complete_type (type
)))
5296 /* We will not yet have set TREE_READONLY on DECL if the type
5297 was "const", but incomplete, before this point. But, now, we
5298 have a complete type, so we can try again. */
5299 cp_apply_type_quals_to_decl (cp_type_quals (type
), decl
);
5303 /* Is it valid for this decl to have an initializer at all? */
5305 /* Don't allow initializations for incomplete types except for
5306 arrays which might be completed by the initialization. */
5308 ; /* A complete type is ok. */
5309 else if (type_uses_auto (type
))
5310 ; /* An auto type is ok. */
5311 else if (TREE_CODE (type
) != ARRAY_TYPE
)
5313 error ("variable %q#D has initializer but incomplete type", decl
);
5314 type
= TREE_TYPE (decl
) = error_mark_node
;
5316 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type
))))
5318 if (DECL_LANG_SPECIFIC (decl
) && DECL_TEMPLATE_INFO (decl
))
5319 error ("elements of array %q#D have incomplete type", decl
);
5320 /* else we already gave an error in start_decl. */
5323 else if (aggregate_definition_p
&& !complete_p
)
5325 if (type_uses_auto (type
))
5326 gcc_assert (CLASS_PLACEHOLDER_TEMPLATE (type
));
5329 error ("aggregate %q#D has incomplete type and cannot be defined",
5331 /* Change the type so that assemble_variable will give
5332 DECL an rtl we can live with: (mem (const_int 0)). */
5333 type
= TREE_TYPE (decl
) = error_mark_node
;
5337 /* Create a new scope to hold this declaration if necessary.
5338 Whether or not a new scope is necessary cannot be determined
5339 until after the type has been completed; if the type is a
5340 specialization of a class template it is not until after
5341 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
5342 will be set correctly. */
5343 maybe_push_cleanup_level (type
);
5346 /* Handle initialization of references. DECL, TYPE, and INIT have the
5347 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
5348 but will be set to a new CLEANUP_STMT if a temporary is created
5349 that must be destroyed subsequently.
5351 Returns an initializer expression to use to initialize DECL, or
5352 NULL if the initialization can be performed statically.
5354 Quotes on semantics can be found in ARM 8.4.3. */
5357 grok_reference_init (tree decl
, tree type
, tree init
, int flags
)
5359 if (init
== NULL_TREE
)
5361 if ((DECL_LANG_SPECIFIC (decl
) == 0
5362 || DECL_IN_AGGR_P (decl
) == 0)
5363 && ! DECL_THIS_EXTERN (decl
))
5364 error_at (DECL_SOURCE_LOCATION (decl
),
5365 "%qD declared as reference but not initialized", decl
);
5369 if (TREE_CODE (init
) == TREE_LIST
)
5370 init
= build_x_compound_expr_from_list (init
, ELK_INIT
,
5371 tf_warning_or_error
);
5373 tree ttype
= TREE_TYPE (type
);
5374 if (TREE_CODE (ttype
) != ARRAY_TYPE
5375 && TREE_CODE (TREE_TYPE (init
)) == ARRAY_TYPE
)
5376 /* Note: default conversion is only called in very special cases. */
5377 init
= decay_conversion (init
, tf_warning_or_error
);
5379 /* check_initializer handles this for non-reference variables, but for
5380 references we need to do it here or the initializer will get the
5381 incomplete array type and confuse later calls to
5382 cp_complete_array_type. */
5383 if (TREE_CODE (ttype
) == ARRAY_TYPE
5384 && TYPE_DOMAIN (ttype
) == NULL_TREE
5385 && (BRACE_ENCLOSED_INITIALIZER_P (init
)
5386 || TREE_CODE (init
) == STRING_CST
))
5388 cp_complete_array_type (&ttype
, init
, false);
5389 if (ttype
!= TREE_TYPE (type
))
5390 type
= cp_build_reference_type (ttype
, TYPE_REF_IS_RVALUE (type
));
5393 /* Convert INIT to the reference type TYPE. This may involve the
5394 creation of a temporary, whose lifetime must be the same as that
5395 of the reference. If so, a DECL_EXPR for the temporary will be
5396 added just after the DECL_EXPR for DECL. That's why we don't set
5397 DECL_INITIAL for local references (instead assigning to them
5398 explicitly); we need to allow the temporary to be initialized
5400 return initialize_reference (type
, init
, flags
,
5401 tf_warning_or_error
);
5404 /* Designated initializers in arrays are not supported in GNU C++.
5405 The parser cannot detect this error since it does not know whether
5406 a given brace-enclosed initializer is for a class type or for an
5407 array. This function checks that CE does not use a designated
5408 initializer. If it does, an error is issued. Returns true if CE
5409 is valid, i.e., does not have a designated initializer. */
5412 check_array_designated_initializer (constructor_elt
*ce
,
5413 unsigned HOST_WIDE_INT index
)
5415 /* Designated initializers for array elements are not supported. */
5418 /* The parser only allows identifiers as designated
5420 if (ce
->index
== error_mark_node
)
5422 error ("name used in a GNU-style designated "
5423 "initializer for an array");
5426 else if (identifier_p (ce
->index
))
5428 error ("name %qD used in a GNU-style designated "
5429 "initializer for an array", ce
->index
);
5433 tree ce_index
= build_expr_type_conversion (WANT_INT
| WANT_ENUM
,
5436 && INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (ce_index
))
5437 && (TREE_CODE (ce_index
= fold_non_dependent_expr (ce_index
))
5440 /* A C99 designator is OK if it matches the current index. */
5441 if (wi::to_wide (ce_index
) == index
)
5443 ce
->index
= ce_index
;
5447 sorry ("non-trivial designated initializers not supported");
5450 error ("C99 designator %qE is not an integral constant-expression",
5459 /* When parsing `int a[] = {1, 2};' we don't know the size of the
5460 array until we finish parsing the initializer. If that's the
5461 situation we're in, update DECL accordingly. */
5464 maybe_deduce_size_from_array_init (tree decl
, tree init
)
5466 tree type
= TREE_TYPE (decl
);
5468 if (TREE_CODE (type
) == ARRAY_TYPE
5469 && TYPE_DOMAIN (type
) == NULL_TREE
5470 && TREE_CODE (decl
) != TYPE_DECL
)
5472 /* do_default is really a C-ism to deal with tentative definitions.
5473 But let's leave it here to ease the eventual merge. */
5474 int do_default
= !DECL_EXTERNAL (decl
);
5475 tree initializer
= init
? init
: DECL_INITIAL (decl
);
5478 /* Check that there are no designated initializers in INIT, as
5479 those are not supported in GNU C++, and as the middle-end
5480 will crash if presented with a non-numeric designated
5482 if (initializer
&& BRACE_ENCLOSED_INITIALIZER_P (initializer
))
5484 vec
<constructor_elt
, va_gc
> *v
= CONSTRUCTOR_ELTS (initializer
);
5485 constructor_elt
*ce
;
5487 FOR_EACH_VEC_SAFE_ELT (v
, i
, ce
)
5489 if (instantiation_dependent_expression_p (ce
->index
))
5491 if (!check_array_designated_initializer (ce
, i
))
5497 TREE_TYPE (decl
) = error_mark_node
;
5500 failure
= cp_complete_array_type (&TREE_TYPE (decl
), initializer
,
5504 error_at (cp_expr_loc_or_loc (initializer
,
5505 DECL_SOURCE_LOCATION (decl
)),
5506 "initializer fails to determine size of %qD", decl
);
5508 else if (failure
== 2)
5512 error_at (DECL_SOURCE_LOCATION (decl
),
5513 "array size missing in %qD", decl
);
5515 /* If a `static' var's size isn't known, make it extern as
5516 well as static, so it does not get allocated. If it's not
5517 `static', then don't mark it extern; finish_incomplete_decl
5518 will give it a default size and it will get allocated. */
5519 else if (!pedantic
&& TREE_STATIC (decl
) && !TREE_PUBLIC (decl
))
5520 DECL_EXTERNAL (decl
) = 1;
5522 else if (failure
== 3)
5524 error_at (DECL_SOURCE_LOCATION (decl
),
5525 "zero-size array %qD", decl
);
5529 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl
)), decl
);
5531 relayout_decl (decl
);
5535 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
5536 any appropriate error messages regarding the layout. */
5539 layout_var_decl (tree decl
)
5543 type
= TREE_TYPE (decl
);
5544 if (type
== error_mark_node
)
5547 /* If we haven't already laid out this declaration, do so now.
5548 Note that we must not call complete type for an external object
5549 because it's type might involve templates that we are not
5550 supposed to instantiate yet. (And it's perfectly valid to say
5551 `extern X x' for some incomplete type `X'.) */
5552 if (!DECL_EXTERNAL (decl
))
5553 complete_type (type
);
5554 if (!DECL_SIZE (decl
)
5555 && TREE_TYPE (decl
) != error_mark_node
5556 && complete_or_array_type_p (type
))
5557 layout_decl (decl
, 0);
5559 if (!DECL_EXTERNAL (decl
) && DECL_SIZE (decl
) == NULL_TREE
)
5561 /* An automatic variable with an incomplete type: that is an error.
5562 Don't talk about array types here, since we took care of that
5563 message in grokdeclarator. */
5564 error_at (DECL_SOURCE_LOCATION (decl
),
5565 "storage size of %qD isn%'t known", decl
);
5566 TREE_TYPE (decl
) = error_mark_node
;
5569 /* Keep this code around in case we later want to control debug info
5570 based on whether a type is "used". (jason 1999-11-11) */
5572 else if (!DECL_EXTERNAL (decl
) && MAYBE_CLASS_TYPE_P (ttype
))
5573 /* Let debugger know it should output info for this type. */
5574 note_debug_info_needed (ttype
);
5576 if (TREE_STATIC (decl
) && DECL_CLASS_SCOPE_P (decl
))
5577 note_debug_info_needed (DECL_CONTEXT (decl
));
5580 if ((DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
5581 && DECL_SIZE (decl
) != NULL_TREE
5582 && ! TREE_CONSTANT (DECL_SIZE (decl
)))
5584 if (TREE_CODE (DECL_SIZE (decl
)) == INTEGER_CST
)
5585 constant_expression_warning (DECL_SIZE (decl
));
5588 error_at (DECL_SOURCE_LOCATION (decl
),
5589 "storage size of %qD isn%'t constant", decl
);
5590 TREE_TYPE (decl
) = error_mark_node
;
5595 /* If a local static variable is declared in an inline function, or if
5596 we have a weak definition, we must endeavor to create only one
5597 instance of the variable at link-time. */
5600 maybe_commonize_var (tree decl
)
5602 /* Don't mess with __FUNCTION__ and similar. */
5603 if (DECL_ARTIFICIAL (decl
))
5606 /* Static data in a function with comdat linkage also has comdat
5608 if ((TREE_STATIC (decl
)
5609 && DECL_FUNCTION_SCOPE_P (decl
)
5610 && vague_linkage_p (DECL_CONTEXT (decl
)))
5611 || (TREE_PUBLIC (decl
) && DECL_INLINE_VAR_P (decl
)))
5615 /* With weak symbols, we simply make the variable COMDAT;
5616 that will cause copies in multiple translations units to
5618 comdat_linkage (decl
);
5622 if (DECL_INITIAL (decl
) == NULL_TREE
5623 || DECL_INITIAL (decl
) == error_mark_node
)
5625 /* Without weak symbols, we can use COMMON to merge
5626 uninitialized variables. */
5627 TREE_PUBLIC (decl
) = 1;
5628 DECL_COMMON (decl
) = 1;
5632 /* While for initialized variables, we must use internal
5633 linkage -- which means that multiple copies will not
5635 TREE_PUBLIC (decl
) = 0;
5636 DECL_COMMON (decl
) = 0;
5637 DECL_INTERFACE_KNOWN (decl
) = 1;
5639 if (DECL_INLINE_VAR_P (decl
))
5640 msg
= G_("sorry: semantics of inline variable "
5641 "%q#D are wrong (you%'ll wind up with "
5642 "multiple copies)");
5644 msg
= G_("sorry: semantics of inline function "
5645 "static data %q#D are wrong (you%'ll wind "
5646 "up with multiple copies)");
5647 if (warning_at (DECL_SOURCE_LOCATION (decl
), 0,
5649 inform (DECL_SOURCE_LOCATION (decl
),
5650 "you can work around this by removing the initializer");
5656 /* Issue an error message if DECL is an uninitialized const variable.
5657 CONSTEXPR_CONTEXT_P is true when the function is called in a constexpr
5658 context from potential_constant_expression. Returns true if all is well,
5662 check_for_uninitialized_const_var (tree decl
, bool constexpr_context_p
,
5663 tsubst_flags_t complain
)
5665 tree type
= strip_array_types (TREE_TYPE (decl
));
5667 /* ``Unless explicitly declared extern, a const object does not have
5668 external linkage and must be initialized. ($8.4; $12.1)'' ARM
5671 && !TYPE_REF_P (type
)
5672 && (constexpr_context_p
5673 || CP_TYPE_CONST_P (type
) || var_in_constexpr_fn (decl
))
5674 && !DECL_NONTRIVIALLY_INITIALIZED_P (decl
))
5676 tree field
= default_init_uninitialized_part (type
);
5680 if (!constexpr_context_p
)
5682 if (CP_TYPE_CONST_P (type
))
5684 if (complain
& tf_error
)
5685 permerror (DECL_SOURCE_LOCATION (decl
),
5686 "uninitialized const %qD", decl
);
5690 if (!is_instantiation_of_constexpr (current_function_decl
)
5691 && (complain
& tf_error
))
5692 error_at (DECL_SOURCE_LOCATION (decl
),
5693 "uninitialized variable %qD in %<constexpr%> "
5695 cp_function_chain
->invalid_constexpr
= true;
5698 else if (complain
& tf_error
)
5699 error_at (DECL_SOURCE_LOCATION (decl
),
5700 "uninitialized variable %qD in %<constexpr%> context",
5703 if (CLASS_TYPE_P (type
) && (complain
& tf_error
))
5705 tree defaulted_ctor
;
5707 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (type
)),
5708 "%q#T has no user-provided default constructor", type
);
5709 defaulted_ctor
= in_class_defaulted_default_constructor (type
);
5711 inform (DECL_SOURCE_LOCATION (defaulted_ctor
),
5712 "constructor is not user-provided because it is "
5713 "explicitly defaulted in the class body");
5714 inform (DECL_SOURCE_LOCATION (field
),
5715 "and the implicitly-defined constructor does not "
5716 "initialize %q#D", field
);
5725 /* Structure holding the current initializer being processed by reshape_init.
5726 CUR is a pointer to the current element being processed, END is a pointer
5727 after the last element present in the initializer. */
5730 constructor_elt
*cur
;
5731 constructor_elt
*end
;
5734 static tree
reshape_init_r (tree
, reshape_iter
*, bool, tsubst_flags_t
);
5736 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
5737 returned is the next FIELD_DECL (possibly FIELD itself) that can be
5738 initialized. If there are no more such fields, the return value
5742 next_initializable_field (tree field
)
5745 && (TREE_CODE (field
) != FIELD_DECL
5746 || DECL_UNNAMED_BIT_FIELD (field
)
5747 || (DECL_ARTIFICIAL (field
)
5748 && !(cxx_dialect
>= cxx17
&& DECL_FIELD_IS_BASE (field
)))))
5749 field
= DECL_CHAIN (field
);
5754 /* Return true for [dcl.init.list] direct-list-initialization from
5755 single element of enumeration with a fixed underlying type. */
5758 is_direct_enum_init (tree type
, tree init
)
5760 if (cxx_dialect
>= cxx17
5761 && TREE_CODE (type
) == ENUMERAL_TYPE
5762 && ENUM_FIXED_UNDERLYING_TYPE_P (type
)
5763 && TREE_CODE (init
) == CONSTRUCTOR
5764 && CONSTRUCTOR_IS_DIRECT_INIT (init
)
5765 && CONSTRUCTOR_NELTS (init
) == 1)
5770 /* Subroutine of reshape_init_array and reshape_init_vector, which does
5771 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
5772 INTEGER_CST representing the size of the array minus one (the maximum index),
5773 or NULL_TREE if the array was declared without specifying the size. D is
5774 the iterator within the constructor. */
5777 reshape_init_array_1 (tree elt_type
, tree max_index
, reshape_iter
*d
,
5778 tsubst_flags_t complain
)
5781 bool sized_array_p
= (max_index
&& TREE_CONSTANT (max_index
));
5782 unsigned HOST_WIDE_INT max_index_cst
= 0;
5783 unsigned HOST_WIDE_INT index
;
5785 /* The initializer for an array is always a CONSTRUCTOR. */
5786 new_init
= build_constructor (init_list_type_node
, NULL
);
5790 /* Minus 1 is used for zero sized arrays. */
5791 if (integer_all_onesp (max_index
))
5794 if (tree_fits_uhwi_p (max_index
))
5795 max_index_cst
= tree_to_uhwi (max_index
);
5796 /* sizetype is sign extended, not zero extended. */
5798 max_index_cst
= tree_to_uhwi (fold_convert (size_type_node
, max_index
));
5801 /* Loop until there are no more initializers. */
5803 d
->cur
!= d
->end
&& (!sized_array_p
|| index
<= max_index_cst
);
5807 constructor_elt
*old_cur
= d
->cur
;
5809 check_array_designated_initializer (d
->cur
, index
);
5810 elt_init
= reshape_init_r (elt_type
, d
, /*first_initializer_p=*/false,
5812 if (elt_init
== error_mark_node
)
5813 return error_mark_node
;
5814 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init
),
5815 size_int (index
), elt_init
);
5816 if (!TREE_CONSTANT (elt_init
))
5817 TREE_CONSTANT (new_init
) = false;
5819 /* This can happen with an invalid initializer (c++/54501). */
5820 if (d
->cur
== old_cur
&& !sized_array_p
)
5827 /* Subroutine of reshape_init_r, processes the initializers for arrays.
5828 Parameters are the same of reshape_init_r. */
5831 reshape_init_array (tree type
, reshape_iter
*d
, tsubst_flags_t complain
)
5833 tree max_index
= NULL_TREE
;
5835 gcc_assert (TREE_CODE (type
) == ARRAY_TYPE
);
5837 if (TYPE_DOMAIN (type
))
5838 max_index
= array_type_nelts (type
);
5840 return reshape_init_array_1 (TREE_TYPE (type
), max_index
, d
, complain
);
5843 /* Subroutine of reshape_init_r, processes the initializers for vectors.
5844 Parameters are the same of reshape_init_r. */
5847 reshape_init_vector (tree type
, reshape_iter
*d
, tsubst_flags_t complain
)
5849 tree max_index
= NULL_TREE
;
5851 gcc_assert (VECTOR_TYPE_P (type
));
5853 if (COMPOUND_LITERAL_P (d
->cur
->value
))
5855 tree value
= d
->cur
->value
;
5856 if (!same_type_p (TREE_TYPE (value
), type
))
5858 if (complain
& tf_error
)
5859 error ("invalid type %qT as initializer for a vector of type %qT",
5860 TREE_TYPE (d
->cur
->value
), type
);
5861 value
= error_mark_node
;
5867 /* For a vector, we initialize it as an array of the appropriate size. */
5868 if (VECTOR_TYPE_P (type
))
5869 max_index
= size_int (TYPE_VECTOR_SUBPARTS (type
) - 1);
5871 return reshape_init_array_1 (TREE_TYPE (type
), max_index
, d
, complain
);
5874 /* Subroutine of reshape_init_r, processes the initializers for classes
5875 or union. Parameters are the same of reshape_init_r. */
5878 reshape_init_class (tree type
, reshape_iter
*d
, bool first_initializer_p
,
5879 tsubst_flags_t complain
)
5884 gcc_assert (CLASS_TYPE_P (type
));
5886 /* The initializer for a class is always a CONSTRUCTOR. */
5887 new_init
= build_constructor (init_list_type_node
, NULL
);
5888 field
= next_initializable_field (TYPE_FIELDS (type
));
5894 An initializer for an aggregate member that is an
5895 empty class shall have the form of an empty
5896 initializer-list {}. */
5897 if (!first_initializer_p
)
5899 if (complain
& tf_error
)
5900 error ("initializer for %qT must be brace-enclosed", type
);
5901 return error_mark_node
;
5906 /* Loop through the initializable fields, gathering initializers. */
5907 while (d
->cur
!= d
->end
)
5910 constructor_elt
*old_cur
= d
->cur
;
5912 /* Handle designated initializers, as an extension. */
5915 if (d
->cur
->index
== error_mark_node
)
5916 return error_mark_node
;
5918 if (TREE_CODE (d
->cur
->index
) == FIELD_DECL
)
5920 /* We already reshaped this. */
5921 if (field
!= d
->cur
->index
)
5923 tree id
= DECL_NAME (d
->cur
->index
);
5925 gcc_checking_assert (d
->cur
->index
5926 == get_class_binding (type
, id
, false));
5927 field
= d
->cur
->index
;
5930 else if (TREE_CODE (d
->cur
->index
) == IDENTIFIER_NODE
)
5931 field
= get_class_binding (type
, d
->cur
->index
, false);
5934 if (complain
& tf_error
)
5935 error ("%<[%E] =%> used in a GNU-style designated initializer"
5936 " for class %qT", d
->cur
->index
, type
);
5937 return error_mark_node
;
5940 if (!field
|| TREE_CODE (field
) != FIELD_DECL
)
5942 if (complain
& tf_error
)
5943 error ("%qT has no non-static data member named %qD", type
,
5945 return error_mark_node
;
5949 /* If we processed all the member of the class, we are done. */
5953 field_init
= reshape_init_r (TREE_TYPE (field
), d
,
5954 /*first_initializer_p=*/false, complain
);
5955 if (field_init
== error_mark_node
)
5956 return error_mark_node
;
5958 if (d
->cur
== old_cur
&& d
->cur
->index
)
5960 /* This can happen with an invalid initializer for a flexible
5961 array member (c++/54441). */
5962 if (complain
& tf_error
)
5963 error ("invalid initializer for %q#D", field
);
5964 return error_mark_node
;
5967 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init
), field
, field_init
);
5971 When a union is initialized with a brace-enclosed
5972 initializer, the braces shall only contain an
5973 initializer for the first member of the union. */
5974 if (TREE_CODE (type
) == UNION_TYPE
)
5977 field
= next_initializable_field (DECL_CHAIN (field
));
5983 /* Subroutine of reshape_init_r. We're in a context where C99 initializer
5984 designators are not valid; either complain or return true to indicate
5985 that reshape_init_r should return error_mark_node. */
5988 has_designator_problem (reshape_iter
*d
, tsubst_flags_t complain
)
5992 if (complain
& tf_error
)
5993 error ("C99 designator %qE outside aggregate initializer",
6001 /* Subroutine of reshape_init, which processes a single initializer (part of
6002 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
6003 iterator within the CONSTRUCTOR which points to the initializer to process.
6004 FIRST_INITIALIZER_P is true if this is the first initializer of the
6005 outermost CONSTRUCTOR node. */
6008 reshape_init_r (tree type
, reshape_iter
*d
, bool first_initializer_p
,
6009 tsubst_flags_t complain
)
6011 tree init
= d
->cur
->value
;
6013 if (error_operand_p (init
))
6014 return error_mark_node
;
6016 if (first_initializer_p
&& !CP_AGGREGATE_TYPE_P (type
)
6017 && has_designator_problem (d
, complain
))
6018 return error_mark_node
;
6020 tree stripped_init
= tree_strip_any_location_wrapper (init
);
6022 if (TREE_CODE (type
) == COMPLEX_TYPE
)
6024 /* A complex type can be initialized from one or two initializers,
6025 but braces are not elided. */
6027 if (BRACE_ENCLOSED_INITIALIZER_P (stripped_init
))
6029 if (CONSTRUCTOR_NELTS (stripped_init
) > 2)
6031 if (complain
& tf_error
)
6032 error ("too many initializers for %qT", type
);
6034 return error_mark_node
;
6037 else if (first_initializer_p
&& d
->cur
!= d
->end
)
6039 vec
<constructor_elt
, va_gc
> *v
= 0;
6040 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, init
);
6041 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, d
->cur
->value
);
6042 if (has_designator_problem (d
, complain
))
6043 return error_mark_node
;
6045 init
= build_constructor (init_list_type_node
, v
);
6050 /* A non-aggregate type is always initialized with a single
6052 if (!CP_AGGREGATE_TYPE_P (type
))
6054 /* It is invalid to initialize a non-aggregate type with a
6055 brace-enclosed initializer before C++0x.
6056 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
6057 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
6058 a CONSTRUCTOR (with a record type). */
6059 if (TREE_CODE (stripped_init
) == CONSTRUCTOR
6060 /* Don't complain about a capture-init. */
6061 && !CONSTRUCTOR_IS_DIRECT_INIT (stripped_init
)
6062 && BRACE_ENCLOSED_INITIALIZER_P (stripped_init
)) /* p7626.C */
6064 if (SCALAR_TYPE_P (type
))
6066 if (cxx_dialect
< cxx11
)
6068 if (complain
& tf_error
)
6069 error ("braces around scalar initializer for type %qT",
6071 init
= error_mark_node
;
6073 else if (first_initializer_p
6074 || (CONSTRUCTOR_NELTS (stripped_init
) > 0
6075 && (BRACE_ENCLOSED_INITIALIZER_P
6076 (CONSTRUCTOR_ELT (stripped_init
,0)->value
))))
6078 if (complain
& tf_error
)
6079 error ("too many braces around scalar initializer"
6080 "for type %qT", type
);
6081 init
= error_mark_node
;
6085 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS
);
6092 /* "If T is a class type and the initializer list has a single element of
6093 type cv U, where U is T or a class derived from T, the object is
6094 initialized from that element." Even if T is an aggregate. */
6095 if (cxx_dialect
>= cxx11
&& (CLASS_TYPE_P (type
) || VECTOR_TYPE_P (type
))
6096 && first_initializer_p
6097 && d
->end
- d
->cur
== 1
6098 && reference_related_p (type
, TREE_TYPE (init
)))
6106 All implicit type conversions (clause _conv_) are considered when
6107 initializing the aggregate member with an initializer from an
6108 initializer-list. If the initializer can initialize a member,
6109 the member is initialized. Otherwise, if the member is itself a
6110 non-empty subaggregate, brace elision is assumed and the
6111 initializer is considered for the initialization of the first
6112 member of the subaggregate. */
6113 if (TREE_CODE (init
) != CONSTRUCTOR
6114 /* But don't try this for the first initializer, since that would be
6115 looking through the outermost braces; A a2 = { a1 }; is not a
6116 valid aggregate initialization. */
6117 && !first_initializer_p
6118 && (same_type_ignoring_top_level_qualifiers_p (type
, TREE_TYPE (init
))
6119 || can_convert_arg (type
, TREE_TYPE (init
), init
, LOOKUP_NORMAL
,
6126 /* [dcl.init.string]
6128 A char array (whether plain char, signed char, or unsigned char)
6129 can be initialized by a string-literal (optionally enclosed in
6130 braces); a wchar_t array can be initialized by a wide
6131 string-literal (optionally enclosed in braces). */
6132 if (TREE_CODE (type
) == ARRAY_TYPE
6133 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type
))))
6135 tree str_init
= init
;
6136 tree stripped_str_init
= stripped_init
;
6138 /* Strip one level of braces if and only if they enclose a single
6139 element (as allowed by [dcl.init.string]). */
6140 if (!first_initializer_p
6141 && TREE_CODE (stripped_str_init
) == CONSTRUCTOR
6142 && CONSTRUCTOR_NELTS (stripped_str_init
) == 1)
6144 str_init
= (*CONSTRUCTOR_ELTS (stripped_str_init
))[0].value
;
6145 stripped_str_init
= tree_strip_any_location_wrapper (str_init
);
6148 /* If it's a string literal, then it's the initializer for the array
6149 as a whole. Otherwise, continue with normal initialization for
6150 array types (one value per array element). */
6151 if (TREE_CODE (stripped_str_init
) == STRING_CST
)
6153 if (has_designator_problem (d
, complain
))
6154 return error_mark_node
;
6160 /* The following cases are about aggregates. If we are not within a full
6161 initializer already, and there is not a CONSTRUCTOR, it means that there
6162 is a missing set of braces (that is, we are processing the case for
6163 which reshape_init exists). */
6164 if (!first_initializer_p
)
6166 if (TREE_CODE (stripped_init
) == CONSTRUCTOR
)
6168 tree init_type
= TREE_TYPE (init
);
6169 if (init_type
&& TYPE_PTRMEMFUNC_P (init_type
))
6170 /* There is no need to call reshape_init for pointer-to-member
6171 function initializers, as they are always constructed correctly
6172 by the front end. Here we have e.g. {.__pfn=0B, .__delta=0},
6173 which is missing outermost braces. We should warn below, and
6174 one of the routines below will wrap it in additional { }. */;
6175 /* For a nested compound literal, there is no need to reshape since
6176 we called reshape_init in finish_compound_literal, before calling
6178 else if (COMPOUND_LITERAL_P (stripped_init
)
6179 /* Similarly, a CONSTRUCTOR of the target's type is a
6180 previously digested initializer. */
6181 || same_type_ignoring_top_level_qualifiers_p (type
,
6185 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (stripped_init
));
6190 /* Something that hasn't been reshaped yet. */
6192 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (stripped_init
));
6193 return reshape_init (type
, init
, complain
);
6197 if (complain
& tf_warning
)
6198 warning (OPT_Wmissing_braces
,
6199 "missing braces around initializer for %qT",
6203 /* Dispatch to specialized routines. */
6204 if (CLASS_TYPE_P (type
))
6205 return reshape_init_class (type
, d
, first_initializer_p
, complain
);
6206 else if (TREE_CODE (type
) == ARRAY_TYPE
)
6207 return reshape_init_array (type
, d
, complain
);
6208 else if (VECTOR_TYPE_P (type
))
6209 return reshape_init_vector (type
, d
, complain
);
6214 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
6215 brace-enclosed aggregate initializer.
6217 INIT is the CONSTRUCTOR containing the list of initializers describing
6218 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
6219 It may not presently match the shape of the TYPE; for example:
6221 struct S { int a; int b; };
6222 struct S a[] = { 1, 2, 3, 4 };
6224 Here INIT will hold a vector of four elements, rather than a
6225 vector of two elements, each itself a vector of two elements. This
6226 routine transforms INIT from the former form into the latter. The
6227 revised CONSTRUCTOR node is returned. */
6230 reshape_init (tree type
, tree init
, tsubst_flags_t complain
)
6232 vec
<constructor_elt
, va_gc
> *v
;
6236 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init
));
6238 v
= CONSTRUCTOR_ELTS (init
);
6240 /* An empty constructor does not need reshaping, and it is always a valid
6242 if (vec_safe_is_empty (v
))
6245 /* Handle [dcl.init.list] direct-list-initialization from
6246 single element of enumeration with a fixed underlying type. */
6247 if (is_direct_enum_init (type
, init
))
6249 tree elt
= CONSTRUCTOR_ELT (init
, 0)->value
;
6250 type
= cv_unqualified (type
);
6251 if (check_narrowing (ENUM_UNDERLYING_TYPE (type
), elt
, complain
))
6253 warning_sentinel
w (warn_useless_cast
);
6254 warning_sentinel
w2 (warn_ignored_qualifiers
);
6255 return cp_build_c_cast (type
, elt
, tf_warning_or_error
);
6258 return error_mark_node
;
6261 /* Recurse on this CONSTRUCTOR. */
6263 d
.end
= d
.cur
+ v
->length ();
6265 new_init
= reshape_init_r (type
, &d
, true, complain
);
6266 if (new_init
== error_mark_node
)
6267 return error_mark_node
;
6269 /* Make sure all the element of the constructor were used. Otherwise,
6270 issue an error about exceeding initializers. */
6273 if (complain
& tf_error
)
6274 error ("too many initializers for %qT", type
);
6275 return error_mark_node
;
6278 if (CONSTRUCTOR_IS_DIRECT_INIT (init
)
6279 && BRACE_ENCLOSED_INITIALIZER_P (new_init
))
6280 CONSTRUCTOR_IS_DIRECT_INIT (new_init
) = true;
6285 /* Verify array initializer. Returns true if errors have been reported. */
6288 check_array_initializer (tree decl
, tree type
, tree init
)
6290 tree element_type
= TREE_TYPE (type
);
6292 /* The array type itself need not be complete, because the
6293 initializer may tell us how many elements are in the array.
6294 But, the elements of the array must be complete. */
6295 if (!COMPLETE_TYPE_P (complete_type (element_type
)))
6298 error_at (DECL_SOURCE_LOCATION (decl
),
6299 "elements of array %q#D have incomplete type", decl
);
6301 error ("elements of array %q#T have incomplete type", type
);
6304 /* A compound literal can't have variable size. */
6306 && ((COMPLETE_TYPE_P (type
) && !TREE_CONSTANT (TYPE_SIZE (type
)))
6307 || !TREE_CONSTANT (TYPE_SIZE (element_type
))))
6309 error ("variable-sized compound literal");
6315 /* Subroutine of check_initializer; args are passed down from that function.
6316 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
6319 build_aggr_init_full_exprs (tree decl
, tree init
, int flags
)
6322 gcc_assert (stmts_are_full_exprs_p ());
6323 return build_aggr_init (decl
, init
, flags
, tf_warning_or_error
);
6326 /* Verify INIT (the initializer for DECL), and record the
6327 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
6328 grok_reference_init.
6330 If the return value is non-NULL, it is an expression that must be
6331 evaluated dynamically to initialize DECL. */
6334 check_initializer (tree decl
, tree init
, int flags
, vec
<tree
, va_gc
> **cleanups
)
6336 tree type
= TREE_TYPE (decl
);
6337 tree init_code
= NULL
;
6340 /* Things that are going to be initialized need to have complete
6342 TREE_TYPE (decl
) = type
= complete_type (TREE_TYPE (decl
));
6344 if (DECL_HAS_VALUE_EXPR_P (decl
))
6346 /* A variable with DECL_HAS_VALUE_EXPR_P set is just a placeholder,
6347 it doesn't have storage to be initialized. */
6348 gcc_assert (init
== NULL_TREE
);
6352 if (type
== error_mark_node
)
6353 /* We will have already complained. */
6356 if (TREE_CODE (type
) == ARRAY_TYPE
)
6358 if (check_array_initializer (decl
, type
, init
))
6361 else if (!COMPLETE_TYPE_P (type
))
6363 error_at (DECL_SOURCE_LOCATION (decl
),
6364 "%q#D has incomplete type", decl
);
6365 TREE_TYPE (decl
) = error_mark_node
;
6369 /* There is no way to make a variable-sized class type in GNU C++. */
6370 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type
)));
6372 if (init
&& BRACE_ENCLOSED_INITIALIZER_P (init
))
6374 int init_len
= CONSTRUCTOR_NELTS (init
);
6375 if (SCALAR_TYPE_P (type
))
6379 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS
);
6380 init
= build_zero_init (type
, NULL_TREE
, false);
6382 else if (init_len
!= 1 && TREE_CODE (type
) != COMPLEX_TYPE
)
6384 error_at (cp_expr_loc_or_loc (init
, DECL_SOURCE_LOCATION (decl
)),
6385 "scalar object %qD requires one element in "
6386 "initializer", decl
);
6387 TREE_TYPE (decl
) = error_mark_node
;
6393 if (TREE_CODE (decl
) == CONST_DECL
)
6395 gcc_assert (!TYPE_REF_P (type
));
6397 DECL_INITIAL (decl
) = init
;
6399 gcc_assert (init
!= NULL_TREE
);
6402 else if (!init
&& DECL_REALLY_EXTERN (decl
))
6404 else if (init
|| type_build_ctor_call (type
)
6405 || TYPE_REF_P (type
))
6407 if (TYPE_REF_P (type
))
6409 init
= grok_reference_init (decl
, type
, init
, flags
);
6410 flags
|= LOOKUP_ALREADY_DIGESTED
;
6413 check_for_uninitialized_const_var (decl
, /*constexpr_context_p=*/false,
6414 tf_warning_or_error
);
6415 /* Do not reshape constructors of vectors (they don't need to be
6417 else if (BRACE_ENCLOSED_INITIALIZER_P (init
))
6419 if (is_std_init_list (type
))
6421 init
= perform_implicit_conversion (type
, init
,
6422 tf_warning_or_error
);
6423 flags
|= LOOKUP_ALREADY_DIGESTED
;
6425 else if (TYPE_NON_AGGREGATE_CLASS (type
))
6427 /* Don't reshape if the class has constructors. */
6428 if (cxx_dialect
== cxx98
)
6429 error_at (cp_expr_loc_or_loc (init
, DECL_SOURCE_LOCATION (decl
)),
6430 "in C++98 %qD must be initialized by "
6431 "constructor, not by %<{...}%>",
6434 else if (VECTOR_TYPE_P (type
) && TYPE_VECTOR_OPAQUE (type
))
6436 error ("opaque vector types cannot be initialized");
6437 init
= error_mark_node
;
6441 init
= reshape_init (type
, init
, tf_warning_or_error
);
6442 flags
|= LOOKUP_NO_NARROWING
;
6445 else if (TREE_CODE (init
) == TREE_LIST
6446 && TREE_TYPE (init
) != unknown_type_node
6447 && !MAYBE_CLASS_TYPE_P (type
))
6449 gcc_assert (TREE_CODE (decl
) != RESULT_DECL
);
6451 /* We get here with code like `int a (2);' */
6452 init
= build_x_compound_expr_from_list (init
, ELK_INIT
,
6453 tf_warning_or_error
);
6456 /* If DECL has an array type without a specific bound, deduce the
6457 array size from the initializer. */
6458 maybe_deduce_size_from_array_init (decl
, init
);
6459 type
= TREE_TYPE (decl
);
6460 if (type
== error_mark_node
)
6463 if (((type_build_ctor_call (type
) || CLASS_TYPE_P (type
))
6464 && !(flags
& LOOKUP_ALREADY_DIGESTED
)
6465 && !(init
&& BRACE_ENCLOSED_INITIALIZER_P (init
)
6466 && CP_AGGREGATE_TYPE_P (type
)
6467 && (CLASS_TYPE_P (type
)
6468 || !TYPE_NEEDS_CONSTRUCTING (type
)
6469 || type_has_extended_temps (type
))))
6470 || (DECL_DECOMPOSITION_P (decl
) && TREE_CODE (type
) == ARRAY_TYPE
))
6472 init_code
= build_aggr_init_full_exprs (decl
, init
, flags
);
6474 /* A constructor call is a non-trivial initializer even if
6475 it isn't explicitly written. */
6476 if (TREE_SIDE_EFFECTS (init_code
))
6477 DECL_NONTRIVIALLY_INITIALIZED_P (decl
) = true;
6479 /* If this is a constexpr initializer, expand_default_init will
6480 have returned an INIT_EXPR rather than a CALL_EXPR. In that
6481 case, pull the initializer back out and pass it down into
6482 store_init_value. */
6483 while (TREE_CODE (init_code
) == EXPR_STMT
6484 || TREE_CODE (init_code
) == CONVERT_EXPR
)
6485 init_code
= TREE_OPERAND (init_code
, 0);
6486 if (TREE_CODE (init_code
) == INIT_EXPR
)
6488 init
= TREE_OPERAND (init_code
, 1);
6489 init_code
= NULL_TREE
;
6490 /* Don't call digest_init; it's unnecessary and will complain
6491 about aggregate initialization of non-aggregate classes. */
6492 flags
|= LOOKUP_ALREADY_DIGESTED
;
6494 else if (DECL_DECLARED_CONSTEXPR_P (decl
))
6496 /* Declared constexpr, but no suitable initializer; massage
6497 init appropriately so we can pass it into store_init_value
6499 if (CLASS_TYPE_P (type
)
6500 && (!init
|| TREE_CODE (init
) == TREE_LIST
))
6502 init
= build_functional_cast (type
, init
, tf_none
);
6503 if (TREE_CODE (init
) == TARGET_EXPR
)
6504 TARGET_EXPR_DIRECT_INIT_P (init
) = true;
6506 init_code
= NULL_TREE
;
6512 if (init
&& TREE_CODE (init
) != TREE_VEC
)
6514 /* In aggregate initialization of a variable, each element
6515 initialization is a full-expression because there is no
6516 enclosing expression. */
6517 gcc_assert (stmts_are_full_exprs_p ());
6519 init_code
= store_init_value (decl
, init
, cleanups
, flags
);
6521 if (DECL_INITIAL (decl
)
6522 && TREE_CODE (DECL_INITIAL (decl
)) == CONSTRUCTOR
6523 && !vec_safe_is_empty (CONSTRUCTOR_ELTS (DECL_INITIAL (decl
))))
6525 tree elt
= CONSTRUCTOR_ELTS (DECL_INITIAL (decl
))->last ().value
;
6526 if (TREE_CODE (TREE_TYPE (elt
)) == ARRAY_TYPE
6527 && TYPE_SIZE (TREE_TYPE (elt
)) == NULL_TREE
)
6528 cp_complete_array_type (&TREE_TYPE (elt
), elt
, false);
6531 if (pedantic
&& TREE_CODE (type
) == ARRAY_TYPE
6532 && DECL_INITIAL (decl
)
6533 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
6534 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl
)))
6535 warning_at (cp_expr_loc_or_loc (DECL_INITIAL (decl
),
6536 DECL_SOURCE_LOCATION (decl
)),
6537 0, "array %qD initialized by parenthesized "
6538 "string literal %qE",
6539 decl
, DECL_INITIAL (decl
));
6545 if (CLASS_TYPE_P (core_type
= strip_array_types (type
))
6546 && (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type
)
6547 || CLASSTYPE_REF_FIELDS_NEED_INIT (core_type
)))
6548 diagnose_uninitialized_cst_or_ref_member (core_type
, /*using_new=*/false,
6551 check_for_uninitialized_const_var (decl
, /*constexpr_context_p=*/false,
6552 tf_warning_or_error
);
6555 if (init
&& init
!= error_mark_node
)
6556 init_code
= build2 (INIT_EXPR
, type
, decl
, init
);
6560 /* We might have set these in cp_finish_decl. */
6561 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
) = false;
6562 TREE_CONSTANT (decl
) = false;
6566 && DECL_IN_AGGR_P (decl
)
6567 && DECL_INITIALIZED_IN_CLASS_P (decl
))
6569 static int explained
= 0;
6571 if (cxx_dialect
< cxx11
)
6572 error ("initializer invalid for static member with constructor");
6573 else if (cxx_dialect
< cxx17
)
6574 error ("non-constant in-class initialization invalid for static "
6575 "member %qD", decl
);
6577 error ("non-constant in-class initialization invalid for non-inline "
6578 "static member %qD", decl
);
6581 inform (input_location
,
6582 "(an out of class initialization is required)");
6591 /* If DECL is not a local variable, give it RTL. */
6594 make_rtl_for_nonlocal_decl (tree decl
, tree init
, const char* asmspec
)
6596 int toplev
= toplevel_bindings_p ();
6599 /* Set the DECL_ASSEMBLER_NAME for the object. */
6602 /* The `register' keyword, when used together with an
6603 asm-specification, indicates that the variable should be
6604 placed in a particular register. */
6605 if (VAR_P (decl
) && DECL_REGISTER (decl
))
6607 set_user_assembler_name (decl
, asmspec
);
6608 DECL_HARD_REGISTER (decl
) = 1;
6612 if (TREE_CODE (decl
) == FUNCTION_DECL
6613 && fndecl_built_in_p (decl
, BUILT_IN_NORMAL
))
6614 set_builtin_user_assembler_name (decl
, asmspec
);
6615 set_user_assembler_name (decl
, asmspec
);
6619 /* Handle non-variables up front. */
6622 rest_of_decl_compilation (decl
, toplev
, at_eof
);
6626 /* If we see a class member here, it should be a static data
6628 if (DECL_LANG_SPECIFIC (decl
) && DECL_IN_AGGR_P (decl
))
6630 gcc_assert (TREE_STATIC (decl
));
6631 /* An in-class declaration of a static data member should be
6632 external; it is only a declaration, and not a definition. */
6633 if (init
== NULL_TREE
)
6634 gcc_assert (DECL_EXTERNAL (decl
)
6635 || !TREE_PUBLIC (decl
));
6638 /* We don't create any RTL for local variables. */
6639 if (DECL_FUNCTION_SCOPE_P (decl
) && !TREE_STATIC (decl
))
6642 /* We defer emission of local statics until the corresponding
6643 DECL_EXPR is expanded. But with constexpr its function might never
6644 be expanded, so go ahead and tell cgraph about the variable now. */
6645 defer_p
= ((DECL_FUNCTION_SCOPE_P (decl
)
6646 && !var_in_maybe_constexpr_fn (decl
))
6647 || DECL_VIRTUAL_P (decl
));
6649 /* Defer template instantiations. */
6650 if (DECL_LANG_SPECIFIC (decl
)
6651 && DECL_IMPLICIT_INSTANTIATION (decl
))
6654 /* If we're not deferring, go ahead and assemble the variable. */
6656 rest_of_decl_compilation (decl
, toplev
, at_eof
);
6659 /* walk_tree helper for wrap_temporary_cleanups, below. */
6662 wrap_cleanups_r (tree
*stmt_p
, int *walk_subtrees
, void *data
)
6664 /* Stop at types or full-expression boundaries. */
6665 if (TYPE_P (*stmt_p
)
6666 || TREE_CODE (*stmt_p
) == CLEANUP_POINT_EXPR
)
6672 if (TREE_CODE (*stmt_p
) == TARGET_EXPR
)
6674 tree guard
= (tree
)data
;
6675 tree tcleanup
= TARGET_EXPR_CLEANUP (*stmt_p
);
6677 tcleanup
= build2 (TRY_CATCH_EXPR
, void_type_node
, tcleanup
, guard
);
6678 /* Tell honor_protect_cleanup_actions to handle this as a separate
6680 TRY_CATCH_IS_CLEANUP (tcleanup
) = 1;
6682 TARGET_EXPR_CLEANUP (*stmt_p
) = tcleanup
;
6688 /* We're initializing a local variable which has a cleanup GUARD. If there
6689 are any temporaries used in the initializer INIT of this variable, we
6690 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
6691 variable will be cleaned up properly if one of them throws.
6693 Unfortunately, there's no way to express this properly in terms of
6694 nesting, as the regions for the temporaries overlap the region for the
6695 variable itself; if there are two temporaries, the variable needs to be
6696 the first thing destroyed if either of them throws. However, we only
6697 want to run the variable's cleanup if it actually got constructed. So
6698 we need to guard the temporary cleanups with the variable's cleanup if
6699 they are run on the normal path, but not if they are run on the
6700 exceptional path. We implement this by telling
6701 honor_protect_cleanup_actions to strip the variable cleanup from the
6702 exceptional path. */
6705 wrap_temporary_cleanups (tree init
, tree guard
)
6707 cp_walk_tree_without_duplicates (&init
, wrap_cleanups_r
, (void *)guard
);
6710 /* Generate code to initialize DECL (a local variable). */
6713 initialize_local_var (tree decl
, tree init
)
6715 tree type
= TREE_TYPE (decl
);
6719 gcc_assert (VAR_P (decl
)
6720 || TREE_CODE (decl
) == RESULT_DECL
);
6721 gcc_assert (!TREE_STATIC (decl
));
6723 if (DECL_SIZE (decl
) == NULL_TREE
)
6725 /* If we used it already as memory, it must stay in memory. */
6726 DECL_INITIAL (decl
) = NULL_TREE
;
6727 TREE_ADDRESSABLE (decl
) = TREE_USED (decl
);
6731 if (type
== error_mark_node
)
6734 /* Compute and store the initial value. */
6735 already_used
= TREE_USED (decl
) || TREE_USED (type
);
6736 if (TREE_USED (type
))
6737 DECL_READ_P (decl
) = 1;
6739 /* Generate a cleanup, if necessary. */
6740 cleanup
= cxx_maybe_build_cleanup (decl
, tf_warning_or_error
);
6742 /* Perform the initialization. */
6745 tree rinit
= (TREE_CODE (init
) == INIT_EXPR
6746 ? TREE_OPERAND (init
, 1) : NULL_TREE
);
6747 if (rinit
&& !TREE_SIDE_EFFECTS (rinit
))
6749 /* Stick simple initializers in DECL_INITIAL so that
6750 -Wno-init-self works (c++/34772). */
6751 gcc_assert (TREE_OPERAND (init
, 0) == decl
);
6752 DECL_INITIAL (decl
) = rinit
;
6754 if (warn_init_self
&& TYPE_REF_P (type
))
6758 warning_at (DECL_SOURCE_LOCATION (decl
),
6760 "reference %qD is initialized with itself", decl
);
6765 int saved_stmts_are_full_exprs_p
;
6767 /* If we're only initializing a single object, guard the
6768 destructors of any temporaries used in its initializer with
6769 its destructor. This isn't right for arrays because each
6770 element initialization is a full-expression. */
6771 if (cleanup
&& TREE_CODE (type
) != ARRAY_TYPE
)
6772 wrap_temporary_cleanups (init
, cleanup
);
6774 gcc_assert (building_stmt_list_p ());
6775 saved_stmts_are_full_exprs_p
= stmts_are_full_exprs_p ();
6776 current_stmt_tree ()->stmts_are_full_exprs_p
= 1;
6777 finish_expr_stmt (init
);
6778 current_stmt_tree ()->stmts_are_full_exprs_p
=
6779 saved_stmts_are_full_exprs_p
;
6783 /* Set this to 0 so we can tell whether an aggregate which was
6784 initialized was ever used. Don't do this if it has a
6785 destructor, so we don't complain about the 'resource
6786 allocation is initialization' idiom. Now set
6787 attribute((unused)) on types so decls of that type will be
6788 marked used. (see TREE_USED, above.) */
6789 if (TYPE_NEEDS_CONSTRUCTING (type
)
6791 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type
)
6792 && DECL_NAME (decl
))
6793 TREE_USED (decl
) = 0;
6794 else if (already_used
)
6795 TREE_USED (decl
) = 1;
6798 finish_decl_cleanup (decl
, cleanup
);
6801 /* DECL is a VAR_DECL for a compiler-generated variable with static
6802 storage duration (like a virtual table) whose initializer is a
6803 compile-time constant. Initialize the variable and provide it to the
6807 initialize_artificial_var (tree decl
, vec
<constructor_elt
, va_gc
> *v
)
6810 gcc_assert (DECL_ARTIFICIAL (decl
));
6811 init
= build_constructor (TREE_TYPE (decl
), v
);
6812 gcc_assert (TREE_CODE (init
) == CONSTRUCTOR
);
6813 DECL_INITIAL (decl
) = init
;
6814 DECL_INITIALIZED_P (decl
) = 1;
6815 /* Mark the decl as constexpr so that we can access its content
6817 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
) = true;
6818 DECL_DECLARED_CONSTEXPR_P (decl
) = true;
6819 determine_visibility (decl
);
6820 layout_var_decl (decl
);
6821 maybe_commonize_var (decl
);
6822 make_rtl_for_nonlocal_decl (decl
, init
, /*asmspec=*/NULL
);
6825 /* INIT is the initializer for a variable, as represented by the
6826 parser. Returns true iff INIT is value-dependent. */
6829 value_dependent_init_p (tree init
)
6831 if (TREE_CODE (init
) == TREE_LIST
)
6832 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
6833 return any_value_dependent_elements_p (init
);
6834 else if (TREE_CODE (init
) == CONSTRUCTOR
)
6835 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
6837 if (dependent_type_p (TREE_TYPE (init
)))
6840 vec
<constructor_elt
, va_gc
> *elts
;
6844 elts
= CONSTRUCTOR_ELTS (init
);
6845 nelts
= vec_safe_length (elts
);
6846 for (i
= 0; i
< nelts
; ++i
)
6847 if (value_dependent_init_p ((*elts
)[i
].value
))
6851 /* It must be a simple expression, e.g., int i = 3; */
6852 return value_dependent_expression_p (init
);
6857 // Returns true if a DECL is VAR_DECL with the concept specifier.
6859 is_concept_var (tree decl
)
6861 return (VAR_P (decl
)
6862 // Not all variables have DECL_LANG_SPECIFIC.
6863 && DECL_LANG_SPECIFIC (decl
)
6864 && DECL_DECLARED_CONCEPT_P (decl
));
6867 /* A helper function to be called via walk_tree. If any label exists
6868 under *TP, it is (going to be) forced. Set has_forced_label_in_static. */
6871 notice_forced_label_r (tree
*tp
, int *walk_subtrees
, void *)
6875 if (TREE_CODE (*tp
) == LABEL_DECL
)
6876 cfun
->has_forced_label_in_static
= 1;
6880 /* Finish processing of a declaration;
6881 install its line number and initial value.
6882 If the length of an array type is not known before,
6883 it must be determined now, from the initial value, or it is an error.
6885 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
6886 true, then INIT is an integral constant expression.
6888 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
6889 if the (init) syntax was used. */
6892 cp_finish_decl (tree decl
, tree init
, bool init_const_expr_p
,
6893 tree asmspec_tree
, int flags
)
6896 vec
<tree
, va_gc
> *cleanups
= NULL
;
6897 const char *asmspec
= NULL
;
6898 int was_readonly
= 0;
6899 bool var_definition_p
= false;
6902 if (decl
== error_mark_node
)
6907 error ("assignment (not initialization) in declaration");
6911 gcc_assert (TREE_CODE (decl
) != RESULT_DECL
);
6912 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
6913 gcc_assert (TREE_CODE (decl
) != PARM_DECL
);
6915 type
= TREE_TYPE (decl
);
6916 if (type
== error_mark_node
)
6919 /* Warn about register storage specifiers except when in GNU global
6920 or local register variable extension. */
6921 if (VAR_P (decl
) && DECL_REGISTER (decl
) && asmspec_tree
== NULL_TREE
)
6923 if (cxx_dialect
>= cxx17
)
6924 pedwarn (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
6925 "ISO C++17 does not allow %<register%> storage "
6928 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
6929 "%<register%> storage class specifier used");
6932 /* If a name was specified, get the string. */
6933 if (at_namespace_scope_p ())
6934 asmspec_tree
= maybe_apply_renaming_pragma (decl
, asmspec_tree
);
6935 if (asmspec_tree
&& asmspec_tree
!= error_mark_node
)
6936 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
6938 if (current_class_type
6939 && CP_DECL_CONTEXT (decl
) == current_class_type
6940 && TYPE_BEING_DEFINED (current_class_type
)
6941 && !CLASSTYPE_TEMPLATE_INSTANTIATION (current_class_type
)
6942 && (DECL_INITIAL (decl
) || init
))
6943 DECL_INITIALIZED_IN_CLASS_P (decl
) = 1;
6945 /* Do auto deduction unless decl is a function or an uninstantiated
6946 template specialization. */
6947 if (TREE_CODE (decl
) != FUNCTION_DECL
6948 && !(init
== NULL_TREE
6949 && DECL_LANG_SPECIFIC (decl
)
6950 && DECL_TEMPLATE_INSTANTIATION (decl
)
6951 && !DECL_TEMPLATE_INSTANTIATED (decl
))
6952 && (auto_node
= type_uses_auto (type
)))
6955 if (init
== NULL_TREE
)
6956 gcc_assert (CLASS_PLACEHOLDER_TEMPLATE (auto_node
));
6960 if (TREE_CODE (d_init
) == TREE_LIST
6961 && !CLASS_PLACEHOLDER_TEMPLATE (auto_node
))
6962 d_init
= build_x_compound_expr_from_list (d_init
, ELK_INIT
,
6963 tf_warning_or_error
);
6964 d_init
= resolve_nondeduced_context (d_init
, tf_warning_or_error
);
6966 enum auto_deduction_context adc
= adc_variable_type
;
6967 if (VAR_P (decl
) && DECL_DECOMPOSITION_P (decl
))
6968 adc
= adc_decomp_type
;
6969 type
= TREE_TYPE (decl
) = do_auto_deduction (type
, d_init
, auto_node
,
6970 tf_warning_or_error
, adc
,
6972 if (type
== error_mark_node
)
6974 if (TREE_CODE (type
) == FUNCTION_TYPE
)
6976 error ("initializer for %<decltype(auto) %D%> has function type "
6977 "(did you forget the %<()%> ?)", decl
);
6978 TREE_TYPE (decl
) = error_mark_node
;
6981 cp_apply_type_quals_to_decl (cp_type_quals (type
), decl
);
6984 if (ensure_literal_type_for_constexpr_object (decl
) == error_mark_node
)
6986 DECL_DECLARED_CONSTEXPR_P (decl
) = 0;
6987 if (VAR_P (decl
) && DECL_CLASS_SCOPE_P (decl
))
6990 DECL_EXTERNAL (decl
) = 1;
6995 && DECL_CLASS_SCOPE_P (decl
)
6996 && DECL_INITIALIZED_IN_CLASS_P (decl
))
6997 check_static_variable_definition (decl
, type
);
6999 if (init
&& TREE_CODE (decl
) == FUNCTION_DECL
)
7002 if (init
== ridpointers
[(int)RID_DELETE
])
7004 /* FIXME check this is 1st decl. */
7005 DECL_DELETED_FN (decl
) = 1;
7006 DECL_DECLARED_INLINE_P (decl
) = 1;
7007 DECL_INITIAL (decl
) = error_mark_node
;
7008 FOR_EACH_CLONE (clone
, decl
)
7010 DECL_DELETED_FN (clone
) = 1;
7011 DECL_DECLARED_INLINE_P (clone
) = 1;
7012 DECL_INITIAL (clone
) = error_mark_node
;
7016 else if (init
== ridpointers
[(int)RID_DEFAULT
])
7018 if (defaultable_fn_check (decl
))
7019 DECL_DEFAULTED_FN (decl
) = 1;
7021 DECL_INITIAL (decl
) = NULL_TREE
;
7025 if (init
&& VAR_P (decl
))
7027 DECL_NONTRIVIALLY_INITIALIZED_P (decl
) = 1;
7028 /* If DECL is a reference, then we want to know whether init is a
7029 reference constant; init_const_expr_p as passed tells us whether
7030 it's an rvalue constant. */
7031 if (TYPE_REF_P (type
))
7032 init_const_expr_p
= potential_constant_expression (init
);
7033 if (init_const_expr_p
)
7035 /* Set these flags now for templates. We'll update the flags in
7036 store_init_value for instantiations. */
7037 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
) = 1;
7038 if (decl_maybe_constant_var_p (decl
)
7039 /* FIXME setting TREE_CONSTANT on refs breaks the back end. */
7040 && !TYPE_REF_P (type
))
7041 TREE_CONSTANT (decl
) = 1;
7045 if (processing_template_decl
)
7047 bool type_dependent_p
;
7049 /* Add this declaration to the statement-tree. */
7050 if (at_function_scope_p ())
7051 add_decl_expr (decl
);
7053 type_dependent_p
= dependent_type_p (type
);
7055 if (check_for_bare_parameter_packs (init
))
7058 DECL_INITIAL (decl
) = NULL_TREE
;
7061 /* Generally, initializers in templates are expanded when the
7062 template is instantiated. But, if DECL is a variable constant
7063 then it can be used in future constant expressions, so its value
7064 must be available. */
7066 bool dep_init
= false;
7068 if (!VAR_P (decl
) || type_dependent_p
)
7069 /* We can't do anything if the decl has dependent type. */;
7070 else if (!init
&& is_concept_var (decl
))
7072 error ("variable concept has no initializer");
7073 init
= boolean_true_node
;
7076 && init_const_expr_p
7077 && !TYPE_REF_P (type
)
7078 && decl_maybe_constant_var_p (decl
)
7079 && !(dep_init
= value_dependent_init_p (init
)))
7081 /* This variable seems to be a non-dependent constant, so process
7082 its initializer. If check_initializer returns non-null the
7083 initialization wasn't constant after all. */
7085 cleanups
= make_tree_vector ();
7086 init_code
= check_initializer (decl
, init
, flags
, &cleanups
);
7087 if (init_code
== NULL_TREE
)
7089 release_tree_vector (cleanups
);
7093 gcc_assert (!DECL_PRETTY_FUNCTION_P (decl
));
7094 /* Deduce array size even if the initializer is dependent. */
7095 maybe_deduce_size_from_array_init (decl
, init
);
7096 /* And complain about multiple initializers. */
7097 if (init
&& TREE_CODE (init
) == TREE_LIST
&& TREE_CHAIN (init
)
7098 && !MAYBE_CLASS_TYPE_P (type
))
7099 init
= build_x_compound_expr_from_list (init
, ELK_INIT
,
7100 tf_warning_or_error
);
7104 DECL_INITIAL (decl
) = init
;
7108 retrofit_lang_decl (decl
);
7109 SET_DECL_DEPENDENT_INIT_P (decl
, true);
7114 /* Just store non-static data member initializers for later. */
7115 if (init
&& TREE_CODE (decl
) == FIELD_DECL
)
7116 DECL_INITIAL (decl
) = init
;
7118 /* Take care of TYPE_DECLs up front. */
7119 if (TREE_CODE (decl
) == TYPE_DECL
)
7121 if (type
!= error_mark_node
7122 && MAYBE_CLASS_TYPE_P (type
) && DECL_NAME (decl
))
7124 if (TREE_TYPE (DECL_NAME (decl
)) && TREE_TYPE (decl
) != type
)
7125 warning (0, "shadowing previous type declaration of %q#D", decl
);
7126 set_identifier_type_value (DECL_NAME (decl
), decl
);
7129 /* If we have installed this as the canonical typedef for this
7130 type, and that type has not been defined yet, delay emitting
7131 the debug information for it, as we will emit it later. */
7132 if (TYPE_MAIN_DECL (TREE_TYPE (decl
)) == decl
7133 && !COMPLETE_TYPE_P (TREE_TYPE (decl
)))
7134 TYPE_DECL_SUPPRESS_DEBUG (decl
) = 1;
7136 rest_of_decl_compilation (decl
, DECL_FILE_SCOPE_P (decl
),
7141 /* A reference will be modified here, as it is initialized. */
7142 if (! DECL_EXTERNAL (decl
)
7143 && TREE_READONLY (decl
)
7144 && TYPE_REF_P (type
))
7147 TREE_READONLY (decl
) = 0;
7152 /* If this is a local variable that will need a mangled name,
7153 register it now. We must do this before processing the
7154 initializer for the variable, since the initialization might
7155 require a guard variable, and since the mangled name of the
7156 guard variable will depend on the mangled name of this
7158 if (DECL_FUNCTION_SCOPE_P (decl
)
7159 && TREE_STATIC (decl
)
7160 && !DECL_ARTIFICIAL (decl
))
7162 /* The variable holding an anonymous union will have had its
7163 discriminator set in finish_anon_union, after which it's
7164 NAME will have been cleared. */
7165 if (DECL_NAME (decl
))
7166 determine_local_discriminator (decl
);
7167 /* Normally has_forced_label_in_static is set during GIMPLE
7168 lowering, but [cd]tors are never actually compiled directly.
7169 We need to set this early so we can deal with the label
7170 address extension. */
7171 if ((DECL_CONSTRUCTOR_P (current_function_decl
)
7172 || DECL_DESTRUCTOR_P (current_function_decl
))
7175 walk_tree (&init
, notice_forced_label_r
, NULL
, NULL
);
7176 add_local_decl (cfun
, decl
);
7178 /* And make sure it's in the symbol table for
7179 c_parse_final_cleanups to find. */
7180 varpool_node::get_create (decl
);
7183 /* Convert the initializer to the type of DECL, if we have not
7184 already initialized DECL. */
7185 if (!DECL_INITIALIZED_P (decl
)
7186 /* If !DECL_EXTERNAL then DECL is being defined. In the
7187 case of a static data member initialized inside the
7188 class-specifier, there can be an initializer even if DECL
7189 is *not* defined. */
7190 && (!DECL_EXTERNAL (decl
) || init
))
7192 cleanups
= make_tree_vector ();
7193 init
= check_initializer (decl
, init
, flags
, &cleanups
);
7199 The memory occupied by any object of static storage
7200 duration is zero-initialized at program startup before
7201 any other initialization takes place.
7203 We cannot create an appropriate initializer until after
7204 the type of DECL is finalized. If DECL_INITIAL is set,
7205 then the DECL is statically initialized, and any
7206 necessary zero-initialization has already been performed. */
7207 if (TREE_STATIC (decl
) && !DECL_INITIAL (decl
))
7208 DECL_INITIAL (decl
) = build_zero_init (TREE_TYPE (decl
),
7209 /*nelts=*/NULL_TREE
,
7210 /*static_storage_p=*/true);
7211 /* Remember that the initialization for this variable has
7213 DECL_INITIALIZED_P (decl
) = 1;
7214 /* This declaration is the definition of this variable,
7215 unless we are initializing a static data member within
7216 the class specifier. */
7217 if (!DECL_EXTERNAL (decl
))
7218 var_definition_p
= true;
7220 /* If the variable has an array type, lay out the type, even if
7221 there is no initializer. It is valid to index through the
7222 array, and we must get TYPE_ALIGN set correctly on the array
7224 else if (TREE_CODE (type
) == ARRAY_TYPE
)
7227 if (TREE_STATIC (decl
)
7228 && !at_function_scope_p ()
7229 && current_function_decl
== NULL
)
7230 /* So decl is a global variable or a static member of a
7231 non local class. Record the types it uses
7232 so that we can decide later to emit debug info for them. */
7233 record_types_used_by_current_var_decl (decl
);
7236 /* Add this declaration to the statement-tree. This needs to happen
7237 after the call to check_initializer so that the DECL_EXPR for a
7238 reference temp is added before the DECL_EXPR for the reference itself. */
7239 if (DECL_FUNCTION_SCOPE_P (decl
))
7241 /* If we're building a variable sized type, and we might be
7242 reachable other than via the top of the current binding
7243 level, then create a new BIND_EXPR so that we deallocate
7244 the object at the right time. */
7247 && !TREE_CONSTANT (DECL_SIZE (decl
))
7248 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list
))
7251 bind
= build3 (BIND_EXPR
, void_type_node
, NULL
, NULL
, NULL
);
7252 TREE_SIDE_EFFECTS (bind
) = 1;
7254 BIND_EXPR_BODY (bind
) = push_stmt_list ();
7256 add_decl_expr (decl
);
7259 /* Let the middle end know about variables and functions -- but not
7260 static data members in uninstantiated class templates. */
7261 if (VAR_OR_FUNCTION_DECL_P (decl
))
7265 layout_var_decl (decl
);
7266 maybe_commonize_var (decl
);
7269 /* This needs to happen after the linkage is set. */
7270 determine_visibility (decl
);
7272 if (var_definition_p
&& TREE_STATIC (decl
))
7274 /* If a TREE_READONLY variable needs initialization
7275 at runtime, it is no longer readonly and we need to
7276 avoid MEM_READONLY_P being set on RTL created for it. */
7279 if (TREE_READONLY (decl
))
7280 TREE_READONLY (decl
) = 0;
7283 else if (was_readonly
)
7284 TREE_READONLY (decl
) = 1;
7286 /* Likewise if it needs destruction. */
7287 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
))
7288 TREE_READONLY (decl
) = 0;
7291 make_rtl_for_nonlocal_decl (decl
, init
, asmspec
);
7293 /* Check for abstractness of the type. Notice that there is no
7294 need to strip array types here since the check for those types
7295 is already done within create_array_type_for_decl. */
7296 abstract_virtuals_error (decl
, type
);
7298 if (TREE_TYPE (decl
) == error_mark_node
)
7299 /* No initialization required. */
7301 else if (TREE_CODE (decl
) == FUNCTION_DECL
)
7305 if (init
== ridpointers
[(int)RID_DEFAULT
])
7307 /* An out-of-class default definition is defined at
7308 the point where it is explicitly defaulted. */
7309 if (DECL_DELETED_FN (decl
))
7310 maybe_explain_implicit_delete (decl
);
7311 else if (DECL_INITIAL (decl
) == error_mark_node
)
7312 synthesize_method (decl
);
7315 error_at (cp_expr_loc_or_loc (init
,
7316 DECL_SOURCE_LOCATION (decl
)),
7317 "function %q#D is initialized like a variable",
7320 /* else no initialization required. */
7322 else if (DECL_EXTERNAL (decl
)
7323 && ! (DECL_LANG_SPECIFIC (decl
)
7324 && DECL_NOT_REALLY_EXTERN (decl
)))
7327 DECL_INITIAL (decl
) = init
;
7329 /* A variable definition. */
7330 else if (DECL_FUNCTION_SCOPE_P (decl
) && !TREE_STATIC (decl
))
7331 /* Initialize the local variable. */
7332 initialize_local_var (decl
, init
);
7334 /* If a variable is defined, and then a subsequent
7335 definition with external linkage is encountered, we will
7336 get here twice for the same variable. We want to avoid
7337 calling expand_static_init more than once. For variables
7338 that are not static data members, we can call
7339 expand_static_init only when we actually process the
7340 initializer. It is not legal to redeclare a static data
7341 member, so this issue does not arise in that case. */
7342 else if (var_definition_p
&& TREE_STATIC (decl
))
7343 expand_static_init (decl
, init
);
7346 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
7347 reference, insert it in the statement-tree now. */
7351 FOR_EACH_VEC_ELT (*cleanups
, i
, t
)
7352 push_cleanup (decl
, t
, false);
7353 release_tree_vector (cleanups
);
7357 TREE_READONLY (decl
) = 1;
7361 && lookup_attribute ("omp declare target implicit",
7362 DECL_ATTRIBUTES (decl
)))
7364 DECL_ATTRIBUTES (decl
)
7365 = remove_attribute ("omp declare target implicit",
7366 DECL_ATTRIBUTES (decl
));
7367 complete_type (TREE_TYPE (decl
));
7368 if (!cp_omp_mappable_type (TREE_TYPE (decl
)))
7369 error ("%q+D in declare target directive does not have mappable type",
7371 else if (!lookup_attribute ("omp declare target",
7372 DECL_ATTRIBUTES (decl
))
7373 && !lookup_attribute ("omp declare target link",
7374 DECL_ATTRIBUTES (decl
)))
7375 DECL_ATTRIBUTES (decl
)
7376 = tree_cons (get_identifier ("omp declare target"),
7377 NULL_TREE
, DECL_ATTRIBUTES (decl
));
7380 invoke_plugin_callbacks (PLUGIN_FINISH_DECL
, decl
);
7383 /* For class TYPE return itself or some its bases that contain
7384 any direct non-static data members. Return error_mark_node if an
7385 error has been diagnosed. */
7388 find_decomp_class_base (location_t loc
, tree type
, tree ret
)
7390 bool member_seen
= false;
7391 for (tree field
= TYPE_FIELDS (type
); field
; field
= DECL_CHAIN (field
))
7392 if (TREE_CODE (field
) != FIELD_DECL
7393 || DECL_ARTIFICIAL (field
)
7394 || DECL_UNNAMED_BIT_FIELD (field
))
7398 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field
)))
7400 if (TREE_CODE (TREE_TYPE (field
)) == RECORD_TYPE
)
7401 error_at (loc
, "cannot decompose class type %qT because it has an "
7402 "anonymous struct member", type
);
7404 error_at (loc
, "cannot decompose class type %qT because it has an "
7405 "anonymous union member", type
);
7406 inform (DECL_SOURCE_LOCATION (field
), "declared here");
7407 return error_mark_node
;
7409 else if (!accessible_p (type
, field
, true))
7411 error_at (loc
, "cannot decompose inaccessible member %qD of %qT",
7413 inform (DECL_SOURCE_LOCATION (field
),
7414 TREE_PRIVATE (field
)
7415 ? G_("declared private here")
7416 : G_("declared protected here"));
7417 return error_mark_node
;
7422 tree base_binfo
, binfo
;
7423 tree orig_ret
= ret
;
7427 for (binfo
= TYPE_BINFO (type
), i
= 0;
7428 BINFO_BASE_ITERATE (binfo
, i
, base_binfo
); i
++)
7430 tree t
= find_decomp_class_base (loc
, TREE_TYPE (base_binfo
), ret
);
7431 if (t
== error_mark_node
)
7432 return error_mark_node
;
7433 if (t
!= NULL_TREE
&& t
!= ret
)
7437 error_at (loc
, "cannot decompose class type %qT: both it and "
7438 "its base class %qT have non-static data members",
7440 return error_mark_node
;
7442 else if (orig_ret
!= NULL_TREE
)
7444 else if (ret
!= NULL_TREE
)
7446 error_at (loc
, "cannot decompose class type %qT: its base "
7447 "classes %qT and %qT have non-static data "
7448 "members", type
, ret
, t
);
7449 return error_mark_node
;
7458 /* Return std::tuple_size<TYPE>::value. */
7461 get_tuple_size (tree type
)
7463 tree args
= make_tree_vec (1);
7464 TREE_VEC_ELT (args
, 0) = type
;
7465 tree inst
= lookup_template_class (tuple_size_identifier
, args
,
7466 /*in_decl*/NULL_TREE
,
7467 /*context*/std_node
,
7468 /*entering_scope*/false, tf_none
);
7469 inst
= complete_type (inst
);
7470 if (inst
== error_mark_node
|| !COMPLETE_TYPE_P (inst
))
7472 tree val
= lookup_qualified_name (inst
, value_identifier
,
7473 /*type*/false, /*complain*/false);
7474 if (TREE_CODE (val
) == VAR_DECL
|| TREE_CODE (val
) == CONST_DECL
)
7475 val
= maybe_constant_value (val
);
7476 if (TREE_CODE (val
) == INTEGER_CST
)
7479 return error_mark_node
;
7482 /* Return std::tuple_element<I,TYPE>::type. */
7485 get_tuple_element_type (tree type
, unsigned i
)
7487 tree args
= make_tree_vec (2);
7488 TREE_VEC_ELT (args
, 0) = build_int_cst (integer_type_node
, i
);
7489 TREE_VEC_ELT (args
, 1) = type
;
7490 tree inst
= lookup_template_class (tuple_element_identifier
, args
,
7491 /*in_decl*/NULL_TREE
,
7492 /*context*/std_node
,
7493 /*entering_scope*/false,
7494 tf_warning_or_error
);
7495 return make_typename_type (inst
, type_identifier
,
7496 none_type
, tf_warning_or_error
);
7499 /* Return e.get<i>() or get<i>(e). */
7502 get_tuple_decomp_init (tree decl
, unsigned i
)
7504 tree targs
= make_tree_vec (1);
7505 TREE_VEC_ELT (targs
, 0) = build_int_cst (integer_type_node
, i
);
7507 tree etype
= TREE_TYPE (decl
);
7508 tree e
= convert_from_reference (decl
);
7510 /* [The id-expression] e is an lvalue if the type of the entity e is an
7511 lvalue reference and an xvalue otherwise. */
7512 if (!TYPE_REF_P (etype
)
7513 || TYPE_REF_IS_RVALUE (etype
))
7516 tree fns
= lookup_qualified_name (TREE_TYPE (e
), get__identifier
,
7517 /*type*/false, /*complain*/false);
7518 bool use_member_get
= false;
7520 /* To use a member get, member lookup must find at least one
7521 declaration that is a function template
7522 whose first template parameter is a non-type parameter. */
7523 for (lkp_iterator
iter (MAYBE_BASELINK_FUNCTIONS (fns
)); iter
; ++iter
)
7526 if (TREE_CODE (fn
) == TEMPLATE_DECL
)
7528 tree tparms
= DECL_TEMPLATE_PARMS (fn
);
7529 tree parm
= TREE_VEC_ELT (INNERMOST_TEMPLATE_PARMS (tparms
), 0);
7530 if (TREE_CODE (TREE_VALUE (parm
)) == PARM_DECL
)
7532 use_member_get
= true;
7540 fns
= lookup_template_function (fns
, targs
);
7541 return build_new_method_call (e
, fns
, /*args*/NULL
,
7542 /*path*/NULL_TREE
, LOOKUP_NORMAL
,
7543 /*fn_p*/NULL
, tf_warning_or_error
);
7547 vec
<tree
,va_gc
> *args
= make_tree_vector_single (e
);
7548 fns
= lookup_template_function (get__identifier
, targs
);
7549 fns
= perform_koenig_lookup (fns
, args
, tf_warning_or_error
);
7550 return finish_call_expr (fns
, &args
, /*novirt*/false,
7551 /*koenig*/true, tf_warning_or_error
);
7555 /* It's impossible to recover the decltype of a tuple decomposition variable
7556 based on the actual type of the variable, so store it in a hash table. */
7558 static GTY((cache
)) tree_cache_map
*decomp_type_table
;
7560 store_decomp_type (tree v
, tree t
)
7562 if (!decomp_type_table
)
7563 decomp_type_table
= tree_cache_map::create_ggc (13);
7564 decomp_type_table
->put (v
, t
);
7568 lookup_decomp_type (tree v
)
7570 return *decomp_type_table
->get (v
);
7573 /* Mangle a decomposition declaration if needed. Arguments like
7574 in cp_finish_decomp. */
7577 cp_maybe_mangle_decomp (tree decl
, tree first
, unsigned int count
)
7579 if (!processing_template_decl
7580 && !error_operand_p (decl
)
7581 && DECL_NAMESPACE_SCOPE_P (decl
))
7583 auto_vec
<tree
, 16> v
;
7584 v
.safe_grow (count
);
7586 for (unsigned int i
= 0; i
< count
; i
++, d
= DECL_CHAIN (d
))
7587 v
[count
- i
- 1] = d
;
7588 SET_DECL_ASSEMBLER_NAME (decl
, mangle_decomp (decl
, v
));
7589 maybe_apply_pragma_weak (decl
);
7593 /* Finish a decomposition declaration. DECL is the underlying declaration
7594 "e", FIRST is the head of a chain of decls for the individual identifiers
7595 chained through DECL_CHAIN in reverse order and COUNT is the number of
7599 cp_finish_decomp (tree decl
, tree first
, unsigned int count
)
7601 if (error_operand_p (decl
))
7606 TREE_TYPE (first
) = error_mark_node
;
7607 if (DECL_HAS_VALUE_EXPR_P (first
))
7609 SET_DECL_VALUE_EXPR (first
, NULL_TREE
);
7610 DECL_HAS_VALUE_EXPR_P (first
) = 0;
7612 first
= DECL_CHAIN (first
);
7614 if (DECL_P (decl
) && DECL_NAMESPACE_SCOPE_P (decl
))
7615 SET_DECL_ASSEMBLER_NAME (decl
, get_identifier ("<decomp>"));
7619 location_t loc
= DECL_SOURCE_LOCATION (decl
);
7620 if (type_dependent_expression_p (decl
)
7621 /* This happens for range for when not in templates.
7622 Still add the DECL_VALUE_EXPRs for later processing. */
7623 || (!processing_template_decl
7624 && type_uses_auto (TREE_TYPE (decl
))))
7626 for (unsigned int i
= 0; i
< count
; i
++)
7628 if (!DECL_HAS_VALUE_EXPR_P (first
))
7630 tree v
= build_nt (ARRAY_REF
, decl
,
7631 size_int (count
- i
- 1),
7632 NULL_TREE
, NULL_TREE
);
7633 SET_DECL_VALUE_EXPR (first
, v
);
7634 DECL_HAS_VALUE_EXPR_P (first
) = 1;
7636 if (processing_template_decl
)
7637 fit_decomposition_lang_decl (first
, decl
);
7638 first
= DECL_CHAIN (first
);
7643 auto_vec
<tree
, 16> v
;
7644 v
.safe_grow (count
);
7646 for (unsigned int i
= 0; i
< count
; i
++, d
= DECL_CHAIN (d
))
7648 v
[count
- i
- 1] = d
;
7649 fit_decomposition_lang_decl (d
, decl
);
7652 tree type
= TREE_TYPE (decl
);
7655 if (TYPE_REF_P (type
))
7657 dexp
= convert_from_reference (dexp
);
7658 type
= complete_type (TREE_TYPE (type
));
7659 if (type
== error_mark_node
)
7661 if (!COMPLETE_TYPE_P (type
))
7663 error_at (loc
, "structured binding refers to incomplete type %qT",
7669 tree eltype
= NULL_TREE
;
7670 unsigned HOST_WIDE_INT eltscnt
= 0;
7671 if (TREE_CODE (type
) == ARRAY_TYPE
)
7674 nelts
= array_type_nelts_top (type
);
7675 if (nelts
== error_mark_node
)
7677 if (!tree_fits_uhwi_p (nelts
))
7679 error_at (loc
, "cannot decompose variable length array %qT", type
);
7682 eltscnt
= tree_to_uhwi (nelts
);
7683 if (count
!= eltscnt
)
7686 if (count
> eltscnt
)
7687 error_n (loc
, count
,
7688 "%u name provided for structured binding",
7689 "%u names provided for structured binding", count
);
7691 error_n (loc
, count
,
7692 "only %u name provided for structured binding",
7693 "only %u names provided for structured binding", count
);
7694 inform_n (loc
, eltscnt
,
7695 "while %qT decomposes into %wu element",
7696 "while %qT decomposes into %wu elements",
7700 eltype
= TREE_TYPE (type
);
7701 for (unsigned int i
= 0; i
< count
; i
++)
7703 TREE_TYPE (v
[i
]) = eltype
;
7704 layout_decl (v
[i
], 0);
7705 if (processing_template_decl
)
7707 tree t
= unshare_expr (dexp
);
7708 t
= build4_loc (DECL_SOURCE_LOCATION (v
[i
]), ARRAY_REF
,
7709 eltype
, t
, size_int (i
), NULL_TREE
,
7711 SET_DECL_VALUE_EXPR (v
[i
], t
);
7712 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7715 /* 2 GNU extensions. */
7716 else if (TREE_CODE (type
) == COMPLEX_TYPE
)
7719 if (count
!= eltscnt
)
7721 eltype
= cp_build_qualified_type (TREE_TYPE (type
), TYPE_QUALS (type
));
7722 for (unsigned int i
= 0; i
< count
; i
++)
7724 TREE_TYPE (v
[i
]) = eltype
;
7725 layout_decl (v
[i
], 0);
7726 if (processing_template_decl
)
7728 tree t
= unshare_expr (dexp
);
7729 t
= build1_loc (DECL_SOURCE_LOCATION (v
[i
]),
7730 i
? IMAGPART_EXPR
: REALPART_EXPR
, eltype
,
7732 SET_DECL_VALUE_EXPR (v
[i
], t
);
7733 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7736 else if (TREE_CODE (type
) == VECTOR_TYPE
)
7738 if (!TYPE_VECTOR_SUBPARTS (type
).is_constant (&eltscnt
))
7740 error_at (loc
, "cannot decompose variable length vector %qT", type
);
7743 if (count
!= eltscnt
)
7745 eltype
= cp_build_qualified_type (TREE_TYPE (type
), TYPE_QUALS (type
));
7746 for (unsigned int i
= 0; i
< count
; i
++)
7748 TREE_TYPE (v
[i
]) = eltype
;
7749 layout_decl (v
[i
], 0);
7750 if (processing_template_decl
)
7752 tree t
= unshare_expr (dexp
);
7753 convert_vector_to_array_for_subscript (DECL_SOURCE_LOCATION (v
[i
]),
7755 t
= build4_loc (DECL_SOURCE_LOCATION (v
[i
]), ARRAY_REF
,
7756 eltype
, t
, size_int (i
), NULL_TREE
,
7758 SET_DECL_VALUE_EXPR (v
[i
], t
);
7759 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7762 else if (tree tsize
= get_tuple_size (type
))
7764 if (tsize
== error_mark_node
)
7766 error_at (loc
, "%<std::tuple_size<%T>::value%> is not an integral "
7767 "constant expression", type
);
7770 if (!tree_fits_uhwi_p (tsize
))
7772 error_n (loc
, count
,
7773 "%u name provided for structured binding",
7774 "%u names provided for structured binding", count
);
7775 inform (loc
, "while %qT decomposes into %E elements",
7779 eltscnt
= tree_to_uhwi (tsize
);
7780 if (count
!= eltscnt
)
7782 int save_read
= DECL_READ_P (decl
);
7783 for (unsigned i
= 0; i
< count
; ++i
)
7785 location_t sloc
= input_location
;
7786 location_t dloc
= DECL_SOURCE_LOCATION (v
[i
]);
7788 input_location
= dloc
;
7789 tree init
= get_tuple_decomp_init (decl
, i
);
7790 tree eltype
= (init
== error_mark_node
? error_mark_node
7791 : get_tuple_element_type (type
, i
));
7792 input_location
= sloc
;
7794 if (init
== error_mark_node
|| eltype
== error_mark_node
)
7796 inform (dloc
, "in initialization of structured binding "
7797 "variable %qD", v
[i
]);
7800 /* Save the decltype away before reference collapse. */
7801 store_decomp_type (v
[i
], eltype
);
7802 eltype
= cp_build_reference_type (eltype
, !lvalue_p (init
));
7803 TREE_TYPE (v
[i
]) = eltype
;
7804 layout_decl (v
[i
], 0);
7805 if (DECL_HAS_VALUE_EXPR_P (v
[i
]))
7807 /* In this case the names are variables, not just proxies. */
7808 SET_DECL_VALUE_EXPR (v
[i
], NULL_TREE
);
7809 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 0;
7811 if (!processing_template_decl
)
7812 cp_finish_decl (v
[i
], init
, /*constexpr*/false,
7813 /*asm*/NULL_TREE
, LOOKUP_NORMAL
);
7815 /* Ignore reads from the underlying decl performed during initialization
7816 of the individual variables. If those will be read, we'll mark
7817 the underlying decl as read at that point. */
7818 DECL_READ_P (decl
) = save_read
;
7820 else if (TREE_CODE (type
) == UNION_TYPE
)
7822 error_at (loc
, "cannot decompose union type %qT", type
);
7825 else if (!CLASS_TYPE_P (type
))
7827 error_at (loc
, "cannot decompose non-array non-class type %qT", type
);
7830 else if (LAMBDA_TYPE_P (type
))
7832 error_at (loc
, "cannot decompose lambda closure type %qT", type
);
7835 else if (processing_template_decl
&& !COMPLETE_TYPE_P (type
))
7836 pedwarn (loc
, 0, "structured binding refers to incomplete class type %qT",
7840 tree btype
= find_decomp_class_base (loc
, type
, NULL_TREE
);
7841 if (btype
== error_mark_node
)
7843 else if (btype
== NULL_TREE
)
7845 error_at (loc
, "cannot decompose class type %qT without non-static "
7846 "data members", type
);
7849 for (tree field
= TYPE_FIELDS (btype
); field
; field
= TREE_CHAIN (field
))
7850 if (TREE_CODE (field
) != FIELD_DECL
7851 || DECL_ARTIFICIAL (field
)
7852 || DECL_UNNAMED_BIT_FIELD (field
))
7856 if (count
!= eltscnt
)
7861 t
= convert_to_base (t
, btype
, /*check_access*/true,
7862 /*nonnull*/false, tf_warning_or_error
);
7866 for (tree field
= TYPE_FIELDS (btype
); field
; field
= TREE_CHAIN (field
))
7867 if (TREE_CODE (field
) != FIELD_DECL
7868 || DECL_ARTIFICIAL (field
)
7869 || DECL_UNNAMED_BIT_FIELD (field
))
7873 tree tt
= finish_non_static_data_member (field
, unshare_expr (t
),
7875 if (REFERENCE_REF_P (tt
))
7876 tt
= TREE_OPERAND (tt
, 0);
7877 TREE_TYPE (v
[i
]) = TREE_TYPE (tt
);
7878 layout_decl (v
[i
], 0);
7879 if (!processing_template_decl
)
7881 SET_DECL_VALUE_EXPR (v
[i
], tt
);
7882 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7887 if (processing_template_decl
)
7889 for (unsigned int i
= 0; i
< count
; i
++)
7890 if (!DECL_HAS_VALUE_EXPR_P (v
[i
]))
7892 tree a
= build_nt (ARRAY_REF
, decl
, size_int (i
),
7893 NULL_TREE
, NULL_TREE
);
7894 SET_DECL_VALUE_EXPR (v
[i
], a
);
7895 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7900 /* Returns a declaration for a VAR_DECL as if:
7902 extern "C" TYPE NAME;
7904 had been seen. Used to create compiler-generated global
7908 declare_global_var (tree name
, tree type
)
7912 push_to_top_level ();
7913 decl
= build_decl (input_location
, VAR_DECL
, name
, type
);
7914 TREE_PUBLIC (decl
) = 1;
7915 DECL_EXTERNAL (decl
) = 1;
7916 DECL_ARTIFICIAL (decl
) = 1;
7917 DECL_CONTEXT (decl
) = FROB_CONTEXT (global_namespace
);
7918 /* If the user has explicitly declared this variable (perhaps
7919 because the code we are compiling is part of a low-level runtime
7920 library), then it is possible that our declaration will be merged
7921 with theirs by pushdecl. */
7922 decl
= pushdecl (decl
);
7923 cp_finish_decl (decl
, NULL_TREE
, false, NULL_TREE
, 0);
7924 pop_from_top_level ();
7929 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
7930 if "__cxa_atexit" is not being used) corresponding to the function
7931 to be called when the program exits. */
7934 get_atexit_fn_ptr_type (void)
7938 if (!atexit_fn_ptr_type_node
)
7941 if (flag_use_cxa_atexit
7942 && !targetm
.cxx
.use_atexit_for_cxa_atexit ())
7943 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
7944 arg_type
= ptr_type_node
;
7946 /* The parameter to "atexit" is "void (*)(void)". */
7947 arg_type
= NULL_TREE
;
7949 fn_type
= build_function_type_list (void_type_node
,
7950 arg_type
, NULL_TREE
);
7951 atexit_fn_ptr_type_node
= build_pointer_type (fn_type
);
7954 return atexit_fn_ptr_type_node
;
7957 /* Returns a pointer to the `atexit' function. Note that if
7958 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
7959 `__cxa_atexit' function specified in the IA64 C++ ABI. */
7962 get_atexit_node (void)
7968 bool use_aeabi_atexit
;
7973 if (flag_use_cxa_atexit
&& !targetm
.cxx
.use_atexit_for_cxa_atexit ())
7975 /* The declaration for `__cxa_atexit' is:
7977 int __cxa_atexit (void (*)(void *), void *, void *)
7979 We build up the argument types and then the function type
7981 tree argtype0
, argtype1
, argtype2
;
7983 use_aeabi_atexit
= targetm
.cxx
.use_aeabi_atexit ();
7984 /* First, build the pointer-to-function type for the first
7986 fn_ptr_type
= get_atexit_fn_ptr_type ();
7987 /* Then, build the rest of the argument types. */
7988 argtype2
= ptr_type_node
;
7989 if (use_aeabi_atexit
)
7991 argtype1
= fn_ptr_type
;
7992 argtype0
= ptr_type_node
;
7996 argtype1
= ptr_type_node
;
7997 argtype0
= fn_ptr_type
;
7999 /* And the final __cxa_atexit type. */
8000 fn_type
= build_function_type_list (integer_type_node
,
8001 argtype0
, argtype1
, argtype2
,
8003 if (use_aeabi_atexit
)
8004 name
= "__aeabi_atexit";
8006 name
= "__cxa_atexit";
8010 /* The declaration for `atexit' is:
8012 int atexit (void (*)());
8014 We build up the argument types and then the function type
8016 fn_ptr_type
= get_atexit_fn_ptr_type ();
8017 /* Build the final atexit type. */
8018 fn_type
= build_function_type_list (integer_type_node
,
8019 fn_ptr_type
, NULL_TREE
);
8023 /* Now, build the function declaration. */
8024 push_lang_context (lang_name_c
);
8025 atexit_fndecl
= build_library_fn_ptr (name
, fn_type
, ECF_LEAF
| ECF_NOTHROW
);
8026 mark_used (atexit_fndecl
);
8027 pop_lang_context ();
8028 atexit_node
= decay_conversion (atexit_fndecl
, tf_warning_or_error
);
8033 /* Like get_atexit_node, but for thread-local cleanups. */
8036 get_thread_atexit_node (void)
8038 /* The declaration for `__cxa_thread_atexit' is:
8040 int __cxa_thread_atexit (void (*)(void *), void *, void *) */
8041 tree fn_type
= build_function_type_list (integer_type_node
,
8042 get_atexit_fn_ptr_type (),
8043 ptr_type_node
, ptr_type_node
,
8046 /* Now, build the function declaration. */
8047 tree atexit_fndecl
= build_library_fn_ptr ("__cxa_thread_atexit", fn_type
,
8048 ECF_LEAF
| ECF_NOTHROW
);
8049 return decay_conversion (atexit_fndecl
, tf_warning_or_error
);
8052 /* Returns the __dso_handle VAR_DECL. */
8055 get_dso_handle_node (void)
8057 if (dso_handle_node
)
8058 return dso_handle_node
;
8060 /* Declare the variable. */
8061 dso_handle_node
= declare_global_var (get_identifier ("__dso_handle"),
8064 #ifdef HAVE_GAS_HIDDEN
8065 if (dso_handle_node
!= error_mark_node
)
8067 DECL_VISIBILITY (dso_handle_node
) = VISIBILITY_HIDDEN
;
8068 DECL_VISIBILITY_SPECIFIED (dso_handle_node
) = 1;
8072 return dso_handle_node
;
8075 /* Begin a new function with internal linkage whose job will be simply
8076 to destroy some particular variable. */
8078 static GTY(()) int start_cleanup_cnt
;
8081 start_cleanup_fn (void)
8086 bool use_cxa_atexit
= flag_use_cxa_atexit
8087 && !targetm
.cxx
.use_atexit_for_cxa_atexit ();
8089 push_to_top_level ();
8091 /* No need to mangle this. */
8092 push_lang_context (lang_name_c
);
8094 /* Build the name of the function. */
8095 sprintf (name
, "__tcf_%d", start_cleanup_cnt
++);
8096 /* Build the function declaration. */
8097 fntype
= TREE_TYPE (get_atexit_fn_ptr_type ());
8098 fndecl
= build_lang_decl (FUNCTION_DECL
, get_identifier (name
), fntype
);
8099 /* It's a function with internal linkage, generated by the
8101 TREE_PUBLIC (fndecl
) = 0;
8102 DECL_ARTIFICIAL (fndecl
) = 1;
8103 /* Make the function `inline' so that it is only emitted if it is
8104 actually needed. It is unlikely that it will be inlined, since
8105 it is only called via a function pointer, but we avoid unnecessary
8106 emissions this way. */
8107 DECL_DECLARED_INLINE_P (fndecl
) = 1;
8108 DECL_INTERFACE_KNOWN (fndecl
) = 1;
8109 /* Build the parameter. */
8112 tree parmdecl
= cp_build_parm_decl (fndecl
, NULL_TREE
, ptr_type_node
);
8113 TREE_USED (parmdecl
) = 1;
8114 DECL_READ_P (parmdecl
) = 1;
8115 DECL_ARGUMENTS (fndecl
) = parmdecl
;
8119 start_preparsed_function (fndecl
, NULL_TREE
, SF_PRE_PARSED
);
8121 pop_lang_context ();
8123 return current_function_decl
;
8126 /* Finish the cleanup function begun by start_cleanup_fn. */
8129 end_cleanup_fn (void)
8131 expand_or_defer_fn (finish_function (/*inline_p=*/false));
8133 pop_from_top_level ();
8136 /* Generate code to handle the destruction of DECL, an object with
8137 static storage duration. */
8140 register_dtor_fn (tree decl
)
8147 bool ob_parm
, dso_parm
, use_dtor
;
8148 tree arg0
, arg1
, arg2
;
8151 type
= TREE_TYPE (decl
);
8152 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type
))
8155 /* If we're using "__cxa_atexit" (or "__cxa_thread_atexit" or
8156 "__aeabi_atexit"), and DECL is a class object, we can just pass the
8157 destructor to "__cxa_atexit"; we don't have to build a temporary
8158 function to do the cleanup. */
8159 dso_parm
= (flag_use_cxa_atexit
8160 && !targetm
.cxx
.use_atexit_for_cxa_atexit ());
8161 ob_parm
= (CP_DECL_THREAD_LOCAL_P (decl
) || dso_parm
);
8162 use_dtor
= ob_parm
&& CLASS_TYPE_P (type
);
8165 cleanup
= get_class_binding (type
, complete_dtor_identifier
);
8167 /* Make sure it is accessible. */
8168 perform_or_defer_access_check (TYPE_BINFO (type
), cleanup
, cleanup
,
8169 tf_warning_or_error
);
8173 /* Call build_cleanup before we enter the anonymous function so
8174 that any access checks will be done relative to the current
8175 scope, rather than the scope of the anonymous function. */
8176 build_cleanup (decl
);
8178 /* Now start the function. */
8179 cleanup
= start_cleanup_fn ();
8181 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
8182 to the original function, rather than the anonymous one. That
8183 will make the back end think that nested functions are in use,
8184 which causes confusion. */
8185 push_deferring_access_checks (dk_no_check
);
8186 fcall
= build_cleanup (decl
);
8187 pop_deferring_access_checks ();
8189 /* Create the body of the anonymous function. */
8190 compound_stmt
= begin_compound_stmt (BCS_FN_BODY
);
8191 finish_expr_stmt (fcall
);
8192 finish_compound_stmt (compound_stmt
);
8196 /* Call atexit with the cleanup function. */
8197 mark_used (cleanup
);
8198 cleanup
= build_address (cleanup
);
8200 if (CP_DECL_THREAD_LOCAL_P (decl
))
8201 atex_node
= get_thread_atexit_node ();
8203 atex_node
= get_atexit_node ();
8207 /* We must convert CLEANUP to the type that "__cxa_atexit"
8209 cleanup
= build_nop (get_atexit_fn_ptr_type (), cleanup
);
8210 /* "__cxa_atexit" will pass the address of DECL to the
8211 cleanup function. */
8213 addr
= build_address (decl
);
8214 /* The declared type of the parameter to "__cxa_atexit" is
8215 "void *". For plain "T*", we could just let the
8216 machinery in cp_build_function_call convert it -- but if the
8217 type is "cv-qualified T *", then we need to convert it
8218 before passing it in, to avoid spurious errors. */
8219 addr
= build_nop (ptr_type_node
, addr
);
8222 /* Since the cleanup functions we build ignore the address
8223 they're given, there's no reason to pass the actual address
8224 in, and, in general, it's cheaper to pass NULL than any
8226 addr
= null_pointer_node
;
8229 arg2
= cp_build_addr_expr (get_dso_handle_node (),
8230 tf_warning_or_error
);
8232 /* Just pass NULL to the dso handle parm if we don't actually
8233 have a DSO handle on this target. */
8234 arg2
= null_pointer_node
;
8240 if (!CP_DECL_THREAD_LOCAL_P (decl
)
8241 && targetm
.cxx
.use_aeabi_atexit ())
8257 return cp_build_function_call_nary (atex_node
, tf_warning_or_error
,
8258 arg0
, arg1
, arg2
, NULL_TREE
);
8261 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
8262 is its initializer. Generate code to handle the construction
8263 and destruction of DECL. */
8266 expand_static_init (tree decl
, tree init
)
8268 gcc_assert (VAR_P (decl
));
8269 gcc_assert (TREE_STATIC (decl
));
8271 /* Some variables require no dynamic initialization. */
8272 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl
)))
8274 /* Make sure the destructor is callable. */
8275 cxx_maybe_build_cleanup (decl
, tf_warning_or_error
);
8280 if (CP_DECL_THREAD_LOCAL_P (decl
) && DECL_GNU_TLS_P (decl
)
8281 && !DECL_FUNCTION_SCOPE_P (decl
))
8283 location_t dloc
= DECL_SOURCE_LOCATION (decl
);
8285 error_at (dloc
, "non-local variable %qD declared %<__thread%> "
8286 "needs dynamic initialization", decl
);
8288 error_at (dloc
, "non-local variable %qD declared %<__thread%> "
8289 "has a non-trivial destructor", decl
);
8290 static bool informed
;
8293 inform (dloc
, "C++11 %<thread_local%> allows dynamic "
8294 "initialization and destruction");
8300 if (DECL_FUNCTION_SCOPE_P (decl
))
8302 /* Emit code to perform this initialization but once. */
8303 tree if_stmt
= NULL_TREE
, inner_if_stmt
= NULL_TREE
;
8304 tree then_clause
= NULL_TREE
, inner_then_clause
= NULL_TREE
;
8305 tree guard
, guard_addr
;
8307 /* We don't need thread-safety code for thread-local vars. */
8308 bool thread_guard
= (flag_threadsafe_statics
8309 && !CP_DECL_THREAD_LOCAL_P (decl
));
8311 /* Emit code to perform this initialization but once. This code
8314 static <type> guard;
8315 if (!__atomic_load (guard.first_byte)) {
8316 if (__cxa_guard_acquire (&guard)) {
8319 // Do initialization.
8320 flag = true; __cxa_guard_release (&guard);
8321 // Register variable for destruction at end of program.
8323 if (!flag) __cxa_guard_abort (&guard);
8328 Note that the `flag' variable is only set to 1 *after* the
8329 initialization is complete. This ensures that an exception,
8330 thrown during the construction, will cause the variable to
8331 reinitialized when we pass through this code again, as per:
8335 If the initialization exits by throwing an exception, the
8336 initialization is not complete, so it will be tried again
8337 the next time control enters the declaration.
8339 This process should be thread-safe, too; multiple threads
8340 should not be able to initialize the variable more than
8343 /* Create the guard variable. */
8344 guard
= get_guard (decl
);
8346 /* Begin the conditional initialization. */
8347 if_stmt
= begin_if_stmt ();
8349 finish_if_stmt_cond (get_guard_cond (guard
, thread_guard
), if_stmt
);
8350 then_clause
= begin_compound_stmt (BCS_NO_SCOPE
);
8354 tree vfntype
= NULL_TREE
;
8355 tree acquire_name
, release_name
, abort_name
;
8356 tree acquire_fn
, release_fn
, abort_fn
;
8357 guard_addr
= build_address (guard
);
8359 acquire_name
= get_identifier ("__cxa_guard_acquire");
8360 release_name
= get_identifier ("__cxa_guard_release");
8361 abort_name
= get_identifier ("__cxa_guard_abort");
8362 acquire_fn
= get_global_binding (acquire_name
);
8363 release_fn
= get_global_binding (release_name
);
8364 abort_fn
= get_global_binding (abort_name
);
8366 acquire_fn
= push_library_fn
8367 (acquire_name
, build_function_type_list (integer_type_node
,
8368 TREE_TYPE (guard_addr
),
8370 NULL_TREE
, ECF_NOTHROW
| ECF_LEAF
);
8371 if (!release_fn
|| !abort_fn
)
8372 vfntype
= build_function_type_list (void_type_node
,
8373 TREE_TYPE (guard_addr
),
8376 release_fn
= push_library_fn (release_name
, vfntype
, NULL_TREE
,
8377 ECF_NOTHROW
| ECF_LEAF
);
8379 abort_fn
= push_library_fn (abort_name
, vfntype
, NULL_TREE
,
8380 ECF_NOTHROW
| ECF_LEAF
);
8382 inner_if_stmt
= begin_if_stmt ();
8383 finish_if_stmt_cond (build_call_n (acquire_fn
, 1, guard_addr
),
8386 inner_then_clause
= begin_compound_stmt (BCS_NO_SCOPE
);
8387 begin
= get_target_expr (boolean_false_node
);
8388 flag
= TARGET_EXPR_SLOT (begin
);
8390 TARGET_EXPR_CLEANUP (begin
)
8391 = build3 (COND_EXPR
, void_type_node
, flag
,
8393 build_call_n (abort_fn
, 1, guard_addr
));
8394 CLEANUP_EH_ONLY (begin
) = 1;
8396 /* Do the initialization itself. */
8397 init
= add_stmt_to_compound (begin
, init
);
8398 init
= add_stmt_to_compound
8399 (init
, build2 (MODIFY_EXPR
, void_type_node
, flag
, boolean_true_node
));
8400 init
= add_stmt_to_compound
8401 (init
, build_call_n (release_fn
, 1, guard_addr
));
8404 init
= add_stmt_to_compound (init
, set_guard (guard
));
8406 /* Use atexit to register a function for destroying this static
8408 init
= add_stmt_to_compound (init
, register_dtor_fn (decl
));
8410 finish_expr_stmt (init
);
8414 finish_compound_stmt (inner_then_clause
);
8415 finish_then_clause (inner_if_stmt
);
8416 finish_if_stmt (inner_if_stmt
);
8419 finish_compound_stmt (then_clause
);
8420 finish_then_clause (if_stmt
);
8421 finish_if_stmt (if_stmt
);
8423 else if (CP_DECL_THREAD_LOCAL_P (decl
))
8424 tls_aggregates
= tree_cons (init
, decl
, tls_aggregates
);
8426 static_aggregates
= tree_cons (init
, decl
, static_aggregates
);
8430 /* Make TYPE a complete type based on INITIAL_VALUE.
8431 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
8432 2 if there was no information (in which case assume 0 if DO_DEFAULT),
8433 3 if the initializer list is empty (in pedantic mode). */
8436 cp_complete_array_type (tree
*ptype
, tree initial_value
, bool do_default
)
8439 tree type
, elt_type
;
8441 /* Don't get confused by a CONSTRUCTOR for some other type. */
8442 if (initial_value
&& TREE_CODE (initial_value
) == CONSTRUCTOR
8443 && !BRACE_ENCLOSED_INITIALIZER_P (initial_value
)
8444 && TREE_CODE (TREE_TYPE (initial_value
)) != ARRAY_TYPE
)
8449 unsigned HOST_WIDE_INT i
;
8452 /* An array of character type can be initialized from a
8453 brace-enclosed string constant.
8455 FIXME: this code is duplicated from reshape_init. Probably
8456 we should just call reshape_init here? */
8457 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype
)))
8458 && TREE_CODE (initial_value
) == CONSTRUCTOR
8459 && !vec_safe_is_empty (CONSTRUCTOR_ELTS (initial_value
)))
8461 vec
<constructor_elt
, va_gc
> *v
= CONSTRUCTOR_ELTS (initial_value
);
8462 tree value
= (*v
)[0].value
;
8463 STRIP_ANY_LOCATION_WRAPPER (value
);
8465 if (TREE_CODE (value
) == STRING_CST
8466 && v
->length () == 1)
8467 initial_value
= value
;
8470 /* If any of the elements are parameter packs, we can't actually
8471 complete this type now because the array size is dependent. */
8472 if (TREE_CODE (initial_value
) == CONSTRUCTOR
)
8474 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value
),
8477 if (PACK_EXPANSION_P (value
))
8483 failure
= complete_array_type (ptype
, initial_value
, do_default
);
8485 /* We can create the array before the element type is complete, which
8486 means that we didn't have these two bits set in the original type
8487 either. In completing the type, we are expected to propagate these
8488 bits. See also complete_type which does the same thing for arrays
8491 if (type
!= error_mark_node
&& TYPE_DOMAIN (type
))
8493 elt_type
= TREE_TYPE (type
);
8494 TYPE_NEEDS_CONSTRUCTING (type
) = TYPE_NEEDS_CONSTRUCTING (elt_type
);
8495 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
)
8496 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type
);
8502 /* As above, but either give an error or reject zero-size arrays, depending
8506 cp_complete_array_type_or_error (tree
*ptype
, tree initial_value
,
8507 bool do_default
, tsubst_flags_t complain
)
8510 bool sfinae
= !(complain
& tf_error
);
8511 /* In SFINAE context we can't be lenient about zero-size arrays. */
8514 failure
= cp_complete_array_type (ptype
, initial_value
, do_default
);
8520 /* Not an error. */;
8521 else if (failure
== 1)
8522 error ("initializer fails to determine size of %qT", *ptype
);
8523 else if (failure
== 2)
8526 error ("array size missing in %qT", *ptype
);
8528 else if (failure
== 3)
8529 error ("zero-size array %qT", *ptype
);
8530 *ptype
= error_mark_node
;
8535 /* Return zero if something is declared to be a member of type
8536 CTYPE when in the context of CUR_TYPE. STRING is the error
8537 message to print in that case. Otherwise, quietly return 1. */
8540 member_function_or_else (tree ctype
, tree cur_type
, enum overload_flags flags
)
8542 if (ctype
&& ctype
!= cur_type
)
8544 if (flags
== DTOR_FLAG
)
8545 error ("destructor for alien class %qT cannot be a member", ctype
);
8547 error ("constructor for alien class %qT cannot be a member", ctype
);
8553 /* Subroutine of `grokdeclarator'. */
8555 /* Generate errors possibly applicable for a given set of specifiers.
8556 This is for ARM $7.1.2. */
8559 bad_specifiers (tree object
,
8560 enum bad_spec_place type
,
8566 const location_t
* locations
)
8572 error_at (locations
[ds_virtual
],
8573 "%qD declared as a %<virtual%> variable", object
);
8575 error ("%<const%> and %<volatile%> function specifiers on "
8576 "%qD invalid in variable declaration", object
);
8580 error_at (locations
[ds_virtual
],
8581 "%qD declared as a %<virtual%> parameter", object
);
8583 error_at (locations
[ds_inline
],
8584 "%qD declared as an %<inline%> parameter", object
);
8586 error ("%<const%> and %<volatile%> function specifiers on "
8587 "%qD invalid in parameter declaration", object
);
8591 error_at (locations
[ds_virtual
],
8592 "%qD declared as a %<virtual%> type", object
);
8594 error_at (locations
[ds_inline
],
8595 "%qD declared as an %<inline%> type", object
);
8597 error ("%<const%> and %<volatile%> function specifiers on "
8598 "%qD invalid in type declaration", object
);
8602 error_at (locations
[ds_virtual
],
8603 "%qD declared as a %<virtual%> field", object
);
8605 error_at (locations
[ds_inline
],
8606 "%qD declared as an %<inline%> field", object
);
8608 error ("%<const%> and %<volatile%> function specifiers on "
8609 "%qD invalid in field declaration", object
);
8615 error ("%q+D declared as a friend", object
);
8617 && !flag_noexcept_type
8618 && (TREE_CODE (object
) == TYPE_DECL
8619 || (!TYPE_PTRFN_P (TREE_TYPE (object
))
8620 && !TYPE_REFFN_P (TREE_TYPE (object
))
8621 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object
)))))
8622 error ("%q+D declared with an exception specification", object
);
8625 /* DECL is a member function or static data member and is presently
8626 being defined. Check that the definition is taking place in a
8630 check_class_member_definition_namespace (tree decl
)
8632 /* These checks only apply to member functions and static data
8634 gcc_assert (VAR_OR_FUNCTION_DECL_P (decl
));
8635 /* We check for problems with specializations in pt.c in
8636 check_specialization_namespace, where we can issue better
8638 if (processing_specialization
)
8640 /* We check this in check_explicit_instantiation_namespace. */
8641 if (processing_explicit_instantiation
)
8645 A member function definition that appears outside of the
8646 class definition shall appear in a namespace scope enclosing
8647 the class definition.
8651 The definition for a static data member shall appear in a
8652 namespace scope enclosing the member's class definition. */
8653 if (!is_ancestor (current_namespace
, DECL_CONTEXT (decl
)))
8654 permerror (input_location
, "definition of %qD is not in namespace enclosing %qT",
8655 decl
, DECL_CONTEXT (decl
));
8658 /* Build a PARM_DECL for the "this" parameter of FN. TYPE is the
8659 METHOD_TYPE for a non-static member function; QUALS are the
8660 cv-qualifiers that apply to the function. */
8663 build_this_parm (tree fn
, tree type
, cp_cv_quals quals
)
8668 cp_cv_quals this_quals
;
8670 if (CLASS_TYPE_P (type
))
8673 = cp_build_qualified_type (type
, quals
& ~TYPE_QUAL_RESTRICT
);
8674 this_type
= build_pointer_type (this_type
);
8677 this_type
= type_of_this_parm (type
);
8678 /* The `this' parameter is implicitly `const'; it cannot be
8680 this_quals
= (quals
& TYPE_QUAL_RESTRICT
) | TYPE_QUAL_CONST
;
8681 qual_type
= cp_build_qualified_type (this_type
, this_quals
);
8682 parm
= build_artificial_parm (fn
, this_identifier
, qual_type
);
8683 cp_apply_type_quals_to_decl (this_quals
, parm
);
8687 /* DECL is a static member function. Complain if it was declared
8688 with function-cv-quals. */
8691 check_static_quals (tree decl
, cp_cv_quals quals
)
8693 if (quals
!= TYPE_UNQUALIFIED
)
8694 error ("static member function %q#D declared with type qualifiers",
8698 // Check that FN takes no arguments and returns bool.
8700 check_concept_fn (tree fn
)
8702 // A constraint is nullary.
8703 if (DECL_ARGUMENTS (fn
))
8704 error_at (DECL_SOURCE_LOCATION (fn
),
8705 "concept %q#D declared with function parameters", fn
);
8707 // The declared return type of the concept shall be bool, and
8708 // it shall not be deduced from it definition.
8709 tree type
= TREE_TYPE (TREE_TYPE (fn
));
8711 error_at (DECL_SOURCE_LOCATION (fn
),
8712 "concept %q#D declared with a deduced return type", fn
);
8713 else if (type
!= boolean_type_node
)
8714 error_at (DECL_SOURCE_LOCATION (fn
),
8715 "concept %q#D with non-%<bool%> return type %qT", fn
, type
);
8718 /* Helper function. Replace the temporary this parameter injected
8719 during cp_finish_omp_declare_simd with the real this parameter. */
8722 declare_simd_adjust_this (tree
*tp
, int *walk_subtrees
, void *data
)
8724 tree this_parm
= (tree
) data
;
8725 if (TREE_CODE (*tp
) == PARM_DECL
8726 && DECL_NAME (*tp
) == this_identifier
8727 && *tp
!= this_parm
)
8729 else if (TYPE_P (*tp
))
8734 /* CTYPE is class type, or null if non-class.
8735 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
8737 DECLARATOR is the function's name.
8738 PARMS is a chain of PARM_DECLs for the function.
8739 VIRTUALP is truthvalue of whether the function is virtual or not.
8740 FLAGS are to be passed through to `grokclassfn'.
8741 QUALS are qualifiers indicating whether the function is `const'
8743 RAISES is a list of exceptions that this function can raise.
8744 CHECK is 1 if we must find this method in CTYPE, 0 if we should
8745 not look, and -1 if we should not call `grokclassfn' at all.
8747 SFK is the kind of special function (if any) for the new function.
8749 Returns `NULL_TREE' if something goes wrong, after issuing
8750 applicable error messages. */
8753 grokfndecl (tree ctype
,
8757 tree orig_declarator
,
8758 const cp_decl_specifier_seq
*declspecs
,
8761 enum overload_flags flags
,
8763 cp_ref_qualifier rqual
,
8770 special_function_kind sfk
,
8772 bool late_return_type_p
,
8776 location_t location
)
8779 int staticp
= ctype
&& TREE_CODE (type
) == FUNCTION_TYPE
;
8782 if (location
== UNKNOWN_LOCATION
)
8783 location
= input_location
;
8785 // Was the concept specifier present?
8786 bool concept_p
= inlinep
& 4;
8788 // Concept declarations must have a corresponding definition.
8789 if (concept_p
&& !funcdef_flag
)
8791 error_at (location
, "concept %qD has no definition", declarator
);
8795 type
= build_cp_fntype_variant (type
, rqual
, raises
, late_return_type_p
);
8797 decl
= build_lang_decl_loc (location
, FUNCTION_DECL
, declarator
, type
);
8799 /* Set the constraints on the declaration. */
8802 tree tmpl_reqs
= NULL_TREE
;
8803 if (processing_template_decl
> template_class_depth (ctype
))
8804 tmpl_reqs
= TEMPLATE_PARMS_CONSTRAINTS (current_template_parms
);
8806 /* Adjust the required expression into a constraint. */
8808 decl_reqs
= normalize_expression (decl_reqs
);
8810 tree ci
= build_constraints (tmpl_reqs
, decl_reqs
);
8811 set_constraints (decl
, ci
);
8814 if (TREE_CODE (type
) == METHOD_TYPE
)
8816 tree parm
= build_this_parm (decl
, type
, quals
);
8817 DECL_CHAIN (parm
) = parms
;
8820 /* Allocate space to hold the vptr bit if needed. */
8821 SET_DECL_ALIGN (decl
, MINIMUM_METHOD_BOUNDARY
);
8824 DECL_ARGUMENTS (decl
) = parms
;
8825 for (t
= parms
; t
; t
= DECL_CHAIN (t
))
8826 DECL_CONTEXT (t
) = decl
;
8828 /* Propagate volatile out from type to decl. */
8829 if (TYPE_VOLATILE (type
))
8830 TREE_THIS_VOLATILE (decl
) = 1;
8832 /* Setup decl according to sfk. */
8835 case sfk_constructor
:
8836 case sfk_copy_constructor
:
8837 case sfk_move_constructor
:
8838 DECL_CXX_CONSTRUCTOR_P (decl
) = 1;
8839 DECL_NAME (decl
) = ctor_identifier
;
8841 case sfk_destructor
:
8842 DECL_CXX_DESTRUCTOR_P (decl
) = 1;
8843 DECL_NAME (decl
) = dtor_identifier
;
8849 if (friendp
&& TREE_CODE (orig_declarator
) == TEMPLATE_ID_EXPR
)
8853 "defining explicit specialization %qD in friend declaration",
8857 tree fns
= TREE_OPERAND (orig_declarator
, 0);
8858 tree args
= TREE_OPERAND (orig_declarator
, 1);
8860 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
8862 /* Something like `template <class T> friend void f<T>()'. */
8864 "invalid use of template-id %qD in declaration "
8865 "of primary template",
8871 /* A friend declaration of the form friend void f<>(). Record
8872 the information in the TEMPLATE_ID_EXPR. */
8873 SET_DECL_IMPLICIT_INSTANTIATION (decl
);
8875 gcc_assert (identifier_p (fns
)
8876 || TREE_CODE (fns
) == OVERLOAD
8877 || TREE_CODE (fns
) == FUNCTION_DECL
);
8878 DECL_TEMPLATE_INFO (decl
) = build_template_info (fns
, args
);
8880 for (t
= TYPE_ARG_TYPES (TREE_TYPE (decl
)); t
; t
= TREE_CHAIN (t
))
8881 if (TREE_PURPOSE (t
)
8882 && TREE_CODE (TREE_PURPOSE (t
)) == DEFAULT_ARG
)
8884 error_at (defarg_location (TREE_PURPOSE (t
)),
8885 "default arguments are not allowed in declaration "
8886 "of friend template specialization %qD",
8893 error_at (declspecs
->locations
[ds_inline
],
8894 "%<inline%> is not allowed in declaration of friend "
8895 "template specialization %qD",
8902 /* C++17 11.3.6/4: "If a friend declaration specifies a default argument
8903 expression, that declaration shall be a definition..." */
8904 if (friendp
&& !funcdef_flag
)
8906 for (tree t
= FUNCTION_FIRST_USER_PARMTYPE (decl
);
8907 t
&& t
!= void_list_node
; t
= TREE_CHAIN (t
))
8908 if (TREE_PURPOSE (t
))
8910 permerror (DECL_SOURCE_LOCATION (decl
),
8911 "friend declaration of %qD specifies default "
8912 "arguments and isn't a definition", decl
);
8917 /* If this decl has namespace scope, set that up. */
8919 set_decl_namespace (decl
, in_namespace
, friendp
);
8921 DECL_CONTEXT (decl
) = FROB_CONTEXT (current_decl_namespace ());
8923 /* `main' and builtins have implicit 'C' linkage. */
8924 if (ctype
== NULL_TREE
8925 && DECL_FILE_SCOPE_P (decl
)
8926 && current_lang_name
== lang_name_cplusplus
8927 && (MAIN_NAME_P (declarator
)
8928 || (IDENTIFIER_LENGTH (declarator
) > 10
8929 && IDENTIFIER_POINTER (declarator
)[0] == '_'
8930 && IDENTIFIER_POINTER (declarator
)[1] == '_'
8931 && strncmp (IDENTIFIER_POINTER (declarator
)+2,
8932 "builtin_", 8) == 0)
8933 || (targetcm
.cxx_implicit_extern_c
8934 && (targetcm
.cxx_implicit_extern_c
8935 (IDENTIFIER_POINTER (declarator
))))))
8936 SET_DECL_LANGUAGE (decl
, lang_c
);
8938 /* Should probably propagate const out from type to decl I bet (mrs). */
8941 DECL_STATIC_FUNCTION_P (decl
) = 1;
8942 DECL_CONTEXT (decl
) = ctype
;
8946 DECL_DELETED_FN (decl
) = 1;
8950 DECL_CONTEXT (decl
) = ctype
;
8952 check_class_member_definition_namespace (decl
);
8955 if (ctype
== NULL_TREE
&& DECL_MAIN_P (decl
))
8957 if (PROCESSING_REAL_TEMPLATE_DECL_P())
8958 error_at (location
, "cannot declare %<::main%> to be a template");
8960 error_at (declspecs
->locations
[ds_inline
],
8961 "cannot declare %<::main%> to be inline");
8963 error_at (declspecs
->locations
[ds_constexpr
],
8964 "cannot declare %<::main%> to be %<constexpr%>");
8966 error_at (location
, "cannot declare %<::main%> to be static");
8971 /* Members of anonymous types and local classes have no linkage; make
8972 them internal. If a typedef is made later, this will be changed. */
8973 if (ctype
&& (!TREE_PUBLIC (TYPE_MAIN_DECL (ctype
))
8974 || decl_function_context (TYPE_MAIN_DECL (ctype
))))
8977 if (publicp
&& cxx_dialect
== cxx98
)
8979 /* [basic.link]: A name with no linkage (notably, the name of a class
8980 or enumeration declared in a local scope) shall not be used to
8981 declare an entity with linkage.
8983 DR 757 relaxes this restriction for C++0x. */
8984 no_linkage_error (decl
);
8987 TREE_PUBLIC (decl
) = publicp
;
8990 DECL_INTERFACE_KNOWN (decl
) = 1;
8991 DECL_NOT_REALLY_EXTERN (decl
) = 1;
8994 /* If the declaration was declared inline, mark it as such. */
8997 DECL_DECLARED_INLINE_P (decl
) = 1;
8999 DECL_COMDAT (decl
) = 1;
9002 DECL_DECLARED_CONSTEXPR_P (decl
) = true;
9004 // If the concept declaration specifier was found, check
9005 // that the declaration satisfies the necessary requirements.
9008 DECL_DECLARED_CONCEPT_P (decl
) = true;
9009 check_concept_fn (decl
);
9012 DECL_EXTERNAL (decl
) = 1;
9013 if (TREE_CODE (type
) == FUNCTION_TYPE
)
9016 TREE_TYPE (decl
) = apply_memfn_quals (TREE_TYPE (decl
),
9023 ? G_("static member function %qD cannot have cv-qualifier")
9024 : G_("non-member function %qD cannot have cv-qualifier"),
9026 quals
= TYPE_UNQUALIFIED
;
9032 ? G_("static member function %qD cannot have ref-qualifier")
9033 : G_("non-member function %qD cannot have ref-qualifier"),
9035 rqual
= REF_QUAL_NONE
;
9039 if (deduction_guide_p (decl
))
9041 if (!DECL_NAMESPACE_SCOPE_P (decl
))
9043 error_at (location
, "deduction guide %qD must be declared at "
9044 "namespace scope", decl
);
9049 "deduction guide %qD must not have a function body", decl
);
9051 else if (IDENTIFIER_ANY_OP_P (DECL_NAME (decl
))
9052 && !grok_op_properties (decl
, /*complain=*/true))
9054 else if (UDLIT_OPER_P (DECL_NAME (decl
)))
9056 bool long_long_unsigned_p
;
9058 const char *suffix
= NULL
;
9059 /* [over.literal]/6: Literal operators shall not have C linkage. */
9060 if (DECL_LANGUAGE (decl
) == lang_c
)
9062 error_at (location
, "literal operator with C linkage");
9063 maybe_show_extern_c_location ();
9067 if (DECL_NAMESPACE_SCOPE_P (decl
))
9069 if (!check_literal_operator_args (decl
, &long_long_unsigned_p
,
9072 error_at (location
, "%qD has invalid argument list", decl
);
9076 suffix
= UDLIT_OP_SUFFIX (DECL_NAME (decl
));
9077 if (long_long_unsigned_p
)
9079 if (cpp_interpret_int_suffix (parse_in
, suffix
, strlen (suffix
)))
9080 warning_at (location
, 0, "integer suffix %qs"
9081 " shadowed by implementation", suffix
);
9083 else if (long_double_p
)
9085 if (cpp_interpret_float_suffix (parse_in
, suffix
, strlen (suffix
)))
9086 warning_at (location
, 0, "floating point suffix %qs"
9087 " shadowed by implementation", suffix
);
9090 if (suffix
[0] != '_'
9091 && !in_system_header_at (location
)
9092 && !current_function_decl
&& !(friendp
&& !funcdef_flag
))
9093 warning_at (location
, OPT_Wliteral_suffix
,
9094 "literal operator suffixes not preceded by %<_%>"
9095 " are reserved for future standardization");
9099 error_at (location
, "%qD must be a non-member function", decl
);
9105 /* Make the init_value nonzero so pushdecl knows this is not
9106 tentative. error_mark_node is replaced later with the BLOCK. */
9107 DECL_INITIAL (decl
) = error_mark_node
;
9109 if (TYPE_NOTHROW_P (type
) || nothrow_libfn_p (decl
))
9110 TREE_NOTHROW (decl
) = 1;
9112 if (flag_openmp
|| flag_openmp_simd
)
9114 /* Adjust "omp declare simd" attributes. */
9115 tree ods
= lookup_attribute ("omp declare simd", *attrlist
);
9119 for (attr
= ods
; attr
;
9120 attr
= lookup_attribute ("omp declare simd", TREE_CHAIN (attr
)))
9122 if (TREE_CODE (type
) == METHOD_TYPE
)
9123 walk_tree (&TREE_VALUE (attr
), declare_simd_adjust_this
,
9124 DECL_ARGUMENTS (decl
), NULL
);
9125 if (TREE_VALUE (attr
) != NULL_TREE
)
9127 tree cl
= TREE_VALUE (TREE_VALUE (attr
));
9128 cl
= c_omp_declare_simd_clauses_to_numbers
9129 (DECL_ARGUMENTS (decl
), cl
);
9131 TREE_VALUE (TREE_VALUE (attr
)) = cl
;
9133 TREE_VALUE (attr
) = NULL_TREE
;
9139 /* Caller will do the rest of this. */
9143 if (ctype
!= NULL_TREE
)
9144 grokclassfn (ctype
, decl
, flags
);
9147 if (cxx_dialect
>= cxx11
9148 && DECL_DESTRUCTOR_P (decl
)
9149 && !TYPE_BEING_DEFINED (DECL_CONTEXT (decl
))
9150 && !processing_template_decl
)
9151 deduce_noexcept_on_destructor (decl
);
9153 decl
= check_explicit_specialization (orig_declarator
, decl
,
9156 4 * (friendp
!= 0) +
9159 if (decl
== error_mark_node
)
9162 if (DECL_STATIC_FUNCTION_P (decl
))
9163 check_static_quals (decl
, quals
);
9167 cplus_decl_attributes (&decl
, *attrlist
, 0);
9168 *attrlist
= NULL_TREE
;
9171 /* Check main's type after attributes have been applied. */
9172 if (ctype
== NULL_TREE
&& DECL_MAIN_P (decl
))
9174 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl
)),
9177 tree oldtypeargs
= TYPE_ARG_TYPES (TREE_TYPE (decl
));
9179 error_at (declspecs
->locations
[ds_type_spec
],
9180 "%<::main%> must return %<int%>");
9181 newtype
= build_function_type (integer_type_node
, oldtypeargs
);
9182 TREE_TYPE (decl
) = newtype
;
9185 check_main_parameter_types (decl
);
9188 if (ctype
!= NULL_TREE
&& check
)
9190 tree old_decl
= check_classfn (ctype
, decl
,
9191 (processing_template_decl
9192 > template_class_depth (ctype
))
9193 ? current_template_parms
9196 if (old_decl
== error_mark_node
)
9204 if (TREE_CODE (old_decl
) == TEMPLATE_DECL
)
9205 /* Because grokfndecl is always supposed to return a
9206 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
9207 here. We depend on our callers to figure out that its
9208 really a template that's being returned. */
9209 old_decl
= DECL_TEMPLATE_RESULT (old_decl
);
9211 if (DECL_STATIC_FUNCTION_P (old_decl
)
9212 && TREE_CODE (TREE_TYPE (decl
)) == METHOD_TYPE
)
9214 /* Remove the `this' parm added by grokclassfn. */
9215 revert_static_member_fn (decl
);
9216 check_static_quals (decl
, quals
);
9218 if (DECL_ARTIFICIAL (old_decl
))
9220 error ("definition of implicitly-declared %qD", old_decl
);
9223 else if (DECL_DEFAULTED_FN (old_decl
))
9225 error ("definition of explicitly-defaulted %q+D", decl
);
9226 inform (DECL_SOURCE_LOCATION (old_decl
),
9227 "%q#D explicitly defaulted here", old_decl
);
9231 /* Since we've smashed OLD_DECL to its
9232 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
9233 if (TREE_CODE (decl
) == TEMPLATE_DECL
)
9234 decl
= DECL_TEMPLATE_RESULT (decl
);
9236 /* Attempt to merge the declarations. This can fail, in
9237 the case of some invalid specialization declarations. */
9238 pushed_scope
= push_scope (ctype
);
9239 ok
= duplicate_decls (decl
, old_decl
, friendp
);
9241 pop_scope (pushed_scope
);
9244 error ("no %q#D member function declared in class %qT",
9248 if (ok
== error_mark_node
)
9254 if (DECL_CONSTRUCTOR_P (decl
) && !grok_ctor_properties (ctype
, decl
))
9257 if (ctype
== NULL_TREE
|| check
)
9261 DECL_VIRTUAL_P (decl
) = 1;
9266 /* decl is a FUNCTION_DECL.
9267 specifiers are the parsed virt-specifiers.
9269 Set flags to reflect the virt-specifiers.
9274 set_virt_specifiers (tree decl
, cp_virt_specifiers specifiers
)
9276 if (decl
== NULL_TREE
)
9278 if (specifiers
& VIRT_SPEC_OVERRIDE
)
9279 DECL_OVERRIDE_P (decl
) = 1;
9280 if (specifiers
& VIRT_SPEC_FINAL
)
9281 DECL_FINAL_P (decl
) = 1;
9285 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
9286 the linkage that DECL will receive in the object file. */
9289 set_linkage_for_static_data_member (tree decl
)
9291 /* A static data member always has static storage duration and
9292 external linkage. Note that static data members are forbidden in
9293 local classes -- the only situation in which a class has
9294 non-external linkage. */
9295 TREE_PUBLIC (decl
) = 1;
9296 TREE_STATIC (decl
) = 1;
9297 /* For non-template classes, static data members are always put
9298 out in exactly those files where they are defined, just as
9299 with ordinary namespace-scope variables. */
9300 if (!processing_template_decl
)
9301 DECL_INTERFACE_KNOWN (decl
) = 1;
9304 /* Create a VAR_DECL named NAME with the indicated TYPE.
9306 If SCOPE is non-NULL, it is the class type or namespace containing
9307 the variable. If SCOPE is NULL, the variable should is created in
9308 the innermost enclosing scope. */
9311 grokvardecl (tree type
,
9313 tree orig_declarator
,
9314 const cp_decl_specifier_seq
*declspecs
,
9321 location_t location
)
9324 tree explicit_scope
;
9326 gcc_assert (!name
|| identifier_p (name
));
9328 bool constp
= (type_quals
& TYPE_QUAL_CONST
) != 0;
9329 bool volatilep
= (type_quals
& TYPE_QUAL_VOLATILE
) != 0;
9331 /* Compute the scope in which to place the variable, but remember
9332 whether or not that scope was explicitly specified by the user. */
9333 explicit_scope
= scope
;
9336 /* An explicit "extern" specifier indicates a namespace-scope
9338 if (declspecs
->storage_class
== sc_extern
)
9339 scope
= current_decl_namespace ();
9340 else if (!at_function_scope_p ())
9341 scope
= current_scope ();
9345 && (/* If the variable is a namespace-scope variable declared in a
9346 template, we need DECL_LANG_SPECIFIC. */
9347 (TREE_CODE (scope
) == NAMESPACE_DECL
&& processing_template_decl
)
9348 /* Similarly for namespace-scope variables with language linkage
9350 || (TREE_CODE (scope
) == NAMESPACE_DECL
9351 && current_lang_name
!= lang_name_cplusplus
)
9352 /* Similarly for static data members. */
9354 /* Similarly for explicit specializations. */
9356 && TREE_CODE (orig_declarator
) == TEMPLATE_ID_EXPR
)))
9357 decl
= build_lang_decl_loc (location
, VAR_DECL
, name
, type
);
9359 decl
= build_decl (location
, VAR_DECL
, name
, type
);
9361 if (explicit_scope
&& TREE_CODE (explicit_scope
) == NAMESPACE_DECL
)
9362 set_decl_namespace (decl
, explicit_scope
, 0);
9364 DECL_CONTEXT (decl
) = FROB_CONTEXT (scope
);
9366 if (declspecs
->storage_class
== sc_extern
)
9368 DECL_THIS_EXTERN (decl
) = 1;
9369 DECL_EXTERNAL (decl
) = !initialized
;
9372 if (DECL_CLASS_SCOPE_P (decl
))
9374 set_linkage_for_static_data_member (decl
);
9375 /* This function is only called with out-of-class definitions. */
9376 DECL_EXTERNAL (decl
) = 0;
9377 check_class_member_definition_namespace (decl
);
9379 /* At top level, either `static' or no s.c. makes a definition
9380 (perhaps tentative), and absence of `static' makes it public. */
9381 else if (toplevel_bindings_p ())
9383 TREE_PUBLIC (decl
) = (declspecs
->storage_class
!= sc_static
9384 && (DECL_THIS_EXTERN (decl
)
9388 TREE_STATIC (decl
) = ! DECL_EXTERNAL (decl
);
9390 /* Not at top level, only `static' makes a static definition. */
9393 TREE_STATIC (decl
) = declspecs
->storage_class
== sc_static
;
9394 TREE_PUBLIC (decl
) = DECL_EXTERNAL (decl
);
9397 if (decl_spec_seq_has_spec_p (declspecs
, ds_thread
))
9399 if (DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
9401 CP_DECL_THREAD_LOCAL_P (decl
) = true;
9402 if (!processing_template_decl
)
9403 set_decl_tls_model (decl
, decl_default_tls_model (decl
));
9405 if (declspecs
->gnu_thread_keyword_p
)
9406 SET_DECL_GNU_TLS_P (decl
);
9409 /* If the type of the decl has no linkage, make sure that we'll
9410 notice that in mark_used. */
9411 if (cxx_dialect
> cxx98
9412 && decl_linkage (decl
) != lk_none
9413 && DECL_LANG_SPECIFIC (decl
) == NULL
9414 && !DECL_EXTERN_C_P (decl
)
9415 && no_linkage_check (TREE_TYPE (decl
), /*relaxed_p=*/false))
9416 retrofit_lang_decl (decl
);
9418 if (TREE_PUBLIC (decl
))
9420 /* [basic.link]: A name with no linkage (notably, the name of a class
9421 or enumeration declared in a local scope) shall not be used to
9422 declare an entity with linkage.
9424 DR 757 relaxes this restriction for C++0x. */
9425 if (cxx_dialect
< cxx11
)
9426 no_linkage_error (decl
);
9429 DECL_INTERFACE_KNOWN (decl
) = 1;
9431 if (DECL_NAME (decl
)
9432 && MAIN_NAME_P (DECL_NAME (decl
))
9433 && scope
== global_namespace
)
9434 error ("cannot declare %<::main%> to be a global variable");
9436 /* Check that the variable can be safely declared as a concept.
9437 Note that this also forbids explicit specializations. */
9440 if (!processing_template_decl
)
9442 error_at (declspecs
->locations
[ds_concept
],
9443 "a non-template variable cannot be %<concept%>");
9447 DECL_DECLARED_CONCEPT_P (decl
) = true;
9448 if (!same_type_ignoring_top_level_qualifiers_p (type
, boolean_type_node
))
9449 error_at (declspecs
->locations
[ds_type_spec
],
9450 "concept must have type %<bool%>");
9452 else if (flag_concepts
9453 && processing_template_decl
> template_class_depth (scope
))
9455 tree reqs
= TEMPLATE_PARMS_CONSTRAINTS (current_template_parms
);
9456 tree ci
= build_constraints (reqs
, NULL_TREE
);
9457 set_constraints (decl
, ci
);
9460 // Handle explicit specializations and instantiations of variable templates.
9461 if (orig_declarator
)
9462 decl
= check_explicit_specialization (orig_declarator
, decl
,
9463 template_count
, conceptp
* 8);
9465 return decl
!= error_mark_node
? decl
: NULL_TREE
;
9468 /* Create and return a canonical pointer to member function type, for
9469 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
9472 build_ptrmemfunc_type (tree type
)
9477 if (type
== error_mark_node
)
9480 /* Make sure that we always have the unqualified pointer-to-member
9482 if (cp_cv_quals quals
= cp_type_quals (type
))
9484 tree unqual
= build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type
));
9485 return cp_build_qualified_type (unqual
, quals
);
9488 /* If a canonical type already exists for this type, use it. We use
9489 this method instead of type_hash_canon, because it only does a
9490 simple equality check on the list of field members. */
9492 t
= TYPE_PTRMEMFUNC_TYPE (type
);
9496 t
= make_node (RECORD_TYPE
);
9498 /* Let the front end know this is a pointer to member function. */
9499 TYPE_PTRMEMFUNC_FLAG (t
) = 1;
9501 field
= build_decl (input_location
, FIELD_DECL
, pfn_identifier
, type
);
9504 field
= build_decl (input_location
, FIELD_DECL
, delta_identifier
,
9506 DECL_CHAIN (field
) = fields
;
9509 finish_builtin_struct (t
, "__ptrmemfunc_type", fields
, ptr_type_node
);
9511 /* Zap out the name so that the back end will give us the debugging
9512 information for this anonymous RECORD_TYPE. */
9513 TYPE_NAME (t
) = NULL_TREE
;
9515 /* Cache this pointer-to-member type so that we can find it again
9517 TYPE_PTRMEMFUNC_TYPE (type
) = t
;
9519 if (TYPE_STRUCTURAL_EQUALITY_P (type
))
9520 SET_TYPE_STRUCTURAL_EQUALITY (t
);
9521 else if (TYPE_CANONICAL (type
) != type
)
9522 TYPE_CANONICAL (t
) = build_ptrmemfunc_type (TYPE_CANONICAL (type
));
9527 /* Create and return a pointer to data member type. */
9530 build_ptrmem_type (tree class_type
, tree member_type
)
9532 if (TREE_CODE (member_type
) == METHOD_TYPE
)
9534 cp_cv_quals quals
= type_memfn_quals (member_type
);
9535 cp_ref_qualifier rqual
= type_memfn_rqual (member_type
);
9536 member_type
= build_memfn_type (member_type
, class_type
, quals
, rqual
);
9537 return build_ptrmemfunc_type (build_pointer_type (member_type
));
9541 gcc_assert (TREE_CODE (member_type
) != FUNCTION_TYPE
);
9542 return build_offset_type (class_type
, member_type
);
9546 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
9547 Check to see that the definition is valid. Issue appropriate error
9551 check_static_variable_definition (tree decl
, tree type
)
9553 /* Avoid redundant diagnostics on out-of-class definitions. */
9554 if (!current_class_type
|| !TYPE_BEING_DEFINED (current_class_type
))
9556 /* Can't check yet if we don't know the type. */
9557 else if (dependent_type_p (type
))
9559 /* If DECL is declared constexpr, we'll do the appropriate checks
9560 in check_initializer. Similarly for inline static data members. */
9561 else if (DECL_P (decl
)
9562 && (DECL_DECLARED_CONSTEXPR_P (decl
)
9563 || undeduced_auto_decl (decl
)
9564 || DECL_VAR_DECLARED_INLINE_P (decl
)))
9566 else if (cxx_dialect
>= cxx11
&& !INTEGRAL_OR_ENUMERATION_TYPE_P (type
))
9568 if (!COMPLETE_TYPE_P (type
))
9569 error_at (DECL_SOURCE_LOCATION (decl
),
9570 "in-class initialization of static data member %q#D of "
9571 "incomplete type", decl
);
9572 else if (literal_type_p (type
))
9573 permerror (DECL_SOURCE_LOCATION (decl
),
9574 "%<constexpr%> needed for in-class initialization of "
9575 "static data member %q#D of non-integral type", decl
);
9577 error_at (DECL_SOURCE_LOCATION (decl
),
9578 "in-class initialization of static data member %q#D of "
9579 "non-literal type", decl
);
9581 /* Motion 10 at San Diego: If a static const integral data member is
9582 initialized with an integral constant expression, the initializer
9583 may appear either in the declaration (within the class), or in
9584 the definition, but not both. If it appears in the class, the
9585 member is a member constant. The file-scope definition is always
9587 else if (!ARITHMETIC_TYPE_P (type
) && TREE_CODE (type
) != ENUMERAL_TYPE
)
9588 error_at (DECL_SOURCE_LOCATION (decl
),
9589 "invalid in-class initialization of static data member "
9590 "of non-integral type %qT",
9592 else if (!CP_TYPE_CONST_P (type
))
9593 error_at (DECL_SOURCE_LOCATION (decl
),
9594 "ISO C++ forbids in-class initialization of non-const "
9595 "static member %qD",
9597 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type
))
9598 pedwarn (DECL_SOURCE_LOCATION (decl
), OPT_Wpedantic
,
9599 "ISO C++ forbids initialization of member constant "
9600 "%qD of non-integral type %qT", decl
, type
);
9603 /* *expr_p is part of the TYPE_SIZE of a variably-sized array. If any
9604 SAVE_EXPRs in *expr_p wrap expressions with side-effects, break those
9605 expressions out into temporary variables so that walk_tree doesn't
9606 step into them (c++/15764). */
9609 stabilize_save_expr_r (tree
*expr_p
, int *walk_subtrees
, void *data
)
9611 hash_set
<tree
> *pset
= (hash_set
<tree
> *)data
;
9612 tree expr
= *expr_p
;
9613 if (TREE_CODE (expr
) == SAVE_EXPR
)
9615 tree op
= TREE_OPERAND (expr
, 0);
9616 cp_walk_tree (&op
, stabilize_save_expr_r
, data
, pset
);
9617 if (TREE_SIDE_EFFECTS (op
))
9618 TREE_OPERAND (expr
, 0) = get_temp_regvar (TREE_TYPE (op
), op
);
9621 else if (!EXPR_P (expr
) || !TREE_SIDE_EFFECTS (expr
))
9626 /* Entry point for the above. */
9629 stabilize_vla_size (tree size
)
9631 hash_set
<tree
> pset
;
9632 /* Break out any function calls into temporary variables. */
9633 cp_walk_tree (&size
, stabilize_save_expr_r
, &pset
, &pset
);
9636 /* Reduce a SIZEOF_EXPR to its value. */
9639 fold_sizeof_expr (tree t
)
9642 if (SIZEOF_EXPR_TYPE_P (t
))
9643 r
= cxx_sizeof_or_alignof_type (TREE_TYPE (TREE_OPERAND (t
, 0)),
9644 SIZEOF_EXPR
, false, false);
9645 else if (TYPE_P (TREE_OPERAND (t
, 0)))
9646 r
= cxx_sizeof_or_alignof_type (TREE_OPERAND (t
, 0), SIZEOF_EXPR
,
9649 r
= cxx_sizeof_or_alignof_expr (TREE_OPERAND (t
, 0), SIZEOF_EXPR
,
9651 if (r
== error_mark_node
)
9656 /* Given the SIZE (i.e., number of elements) in an array, compute
9657 an appropriate index type for the array. If non-NULL, NAME is
9658 the name of the entity being declared. */
9661 compute_array_index_type_loc (location_t name_loc
, tree name
, tree size
,
9662 tsubst_flags_t complain
)
9664 if (error_operand_p (size
))
9665 return error_mark_node
;
9667 /* The type of the index being computed. */
9670 /* The original numeric size as seen in the source code before
9671 conversion to size_t. */
9672 tree origsize
= size
;
9674 location_t loc
= cp_expr_loc_or_loc (size
, name
? name_loc
: input_location
);
9676 if (!type_dependent_expression_p (size
))
9678 origsize
= size
= mark_rvalue_use (size
);
9680 if (cxx_dialect
< cxx11
&& TREE_CODE (size
) == NOP_EXPR
9681 && TREE_SIDE_EFFECTS (size
))
9682 /* In C++98, we mark a non-constant array bound with a magic
9683 NOP_EXPR with TREE_SIDE_EFFECTS; don't fold in that case. */;
9686 size
= instantiate_non_dependent_expr_sfinae (size
, complain
);
9687 size
= build_converted_constant_expr (size_type_node
, size
, complain
);
9688 /* Pedantically a constant expression is required here and so
9689 __builtin_is_constant_evaluated () should fold to true if it
9690 is successfully folded into a constant. */
9691 size
= maybe_constant_value (size
, NULL_TREE
,
9692 /*manifestly_const_eval=*/true);
9694 if (!TREE_CONSTANT (size
))
9698 if (error_operand_p (size
))
9699 return error_mark_node
;
9701 /* The array bound must be an integer type. */
9702 tree type
= TREE_TYPE (size
);
9703 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type
))
9705 if (!(complain
& tf_error
))
9706 return error_mark_node
;
9708 error_at (loc
, "size of array %qD has non-integral type %qT",
9711 error_at (loc
, "size of array has non-integral type %qT", type
);
9712 size
= integer_one_node
;
9716 /* A type is dependent if it is...an array type constructed from any
9717 dependent type or whose size is specified by a constant expression
9718 that is value-dependent. */
9719 /* We can only call value_dependent_expression_p on integral constant
9720 expressions; treat non-constant expressions as dependent, too. */
9721 if (processing_template_decl
9722 && (type_dependent_expression_p (size
)
9723 || !TREE_CONSTANT (size
) || value_dependent_expression_p (size
)))
9725 /* We cannot do any checking for a SIZE that isn't known to be
9726 constant. Just build the index type and mark that it requires
9727 structural equality checks. */
9728 itype
= build_index_type (build_min (MINUS_EXPR
, sizetype
,
9729 size
, size_one_node
));
9730 TYPE_DEPENDENT_P (itype
) = 1;
9731 TYPE_DEPENDENT_P_VALID (itype
) = 1;
9732 SET_TYPE_STRUCTURAL_EQUALITY (itype
);
9736 if (TREE_CODE (size
) != INTEGER_CST
)
9738 tree folded
= cp_fully_fold (size
);
9739 if (TREE_CODE (folded
) == INTEGER_CST
)
9742 pedwarn (loc
, OPT_Wpedantic
, "size of array %qD is not an "
9743 "integral constant-expression", name
);
9745 pedwarn (loc
, OPT_Wpedantic
,
9746 "size of array is not an integral constant-expression");
9748 /* Use the folded result for VLAs, too; it will have resolved
9753 /* Normally, the array-bound will be a constant. */
9754 if (TREE_CODE (size
) == INTEGER_CST
)
9756 /* The size to use in diagnostics that reflects the constant
9757 size used in the source, rather than SIZE massaged above. */
9758 tree diagsize
= size
;
9760 /* If the original size before conversion to size_t was signed
9761 and negative, convert it to ssizetype to restore the sign. */
9762 if (!TYPE_UNSIGNED (TREE_TYPE (origsize
))
9763 && TREE_CODE (size
) == INTEGER_CST
9764 && tree_int_cst_sign_bit (size
))
9766 diagsize
= fold_convert (ssizetype
, size
);
9768 /* Clear the overflow bit that may have been set as a result
9769 of the conversion from the sizetype of the new size to
9771 TREE_OVERFLOW (diagsize
) = false;
9774 /* Verify that the array has a positive number of elements
9775 and issue the appropriate diagnostic if it doesn't. */
9776 if (!valid_array_size_p (loc
, diagsize
, name
, (complain
& tf_error
)))
9778 if (!(complain
& tf_error
))
9779 return error_mark_node
;
9780 size
= integer_one_node
;
9782 /* As an extension we allow zero-sized arrays. */
9783 else if (integer_zerop (size
))
9785 if (!(complain
& tf_error
))
9786 /* We must fail if performing argument deduction (as
9787 indicated by the state of complain), so that
9788 another substitution can be found. */
9789 return error_mark_node
;
9790 else if (in_system_header_at (input_location
))
9791 /* Allow them in system headers because glibc uses them. */;
9793 pedwarn (loc
, OPT_Wpedantic
,
9794 "ISO C++ forbids zero-size array %qD", name
);
9796 pedwarn (loc
, OPT_Wpedantic
,
9797 "ISO C++ forbids zero-size array");
9800 else if (TREE_CONSTANT (size
)
9801 /* We don't allow VLAs at non-function scopes, or during
9802 tentative template substitution. */
9803 || !at_function_scope_p ()
9804 || !(complain
& tf_error
))
9806 if (!(complain
& tf_error
))
9807 return error_mark_node
;
9808 /* `(int) &fn' is not a valid array bound. */
9811 "size of array %qD is not an integral constant-expression",
9814 error_at (loc
, "size of array is not an integral constant-expression");
9815 size
= integer_one_node
;
9817 else if (pedantic
&& warn_vla
!= 0)
9820 pedwarn (name_loc
, OPT_Wvla
,
9821 "ISO C++ forbids variable length array %qD", name
);
9823 pedwarn (input_location
, OPT_Wvla
,
9824 "ISO C++ forbids variable length array");
9826 else if (warn_vla
> 0)
9829 warning_at (name_loc
, OPT_Wvla
,
9830 "variable length array %qD is used", name
);
9833 "variable length array is used");
9836 if (processing_template_decl
&& !TREE_CONSTANT (size
))
9837 /* A variable sized array. */
9838 itype
= build_min (MINUS_EXPR
, sizetype
, size
, integer_one_node
);
9841 /* Compute the index of the largest element in the array. It is
9842 one less than the number of elements in the array. We save
9843 and restore PROCESSING_TEMPLATE_DECL so that computations in
9844 cp_build_binary_op will be appropriately folded. */
9846 processing_template_decl_sentinel s
;
9847 itype
= cp_build_binary_op (input_location
,
9849 cp_convert (ssizetype
, size
, complain
),
9850 cp_convert (ssizetype
, integer_one_node
,
9853 itype
= maybe_constant_value (itype
);
9856 if (!TREE_CONSTANT (itype
))
9858 /* A variable sized array. */
9859 itype
= variable_size (itype
);
9861 stabilize_vla_size (itype
);
9863 if (sanitize_flags_p (SANITIZE_VLA
)
9864 && current_function_decl
!= NULL_TREE
)
9866 /* We have to add 1 -- in the ubsan routine we generate
9867 LE_EXPR rather than LT_EXPR. */
9868 tree t
= fold_build2 (PLUS_EXPR
, TREE_TYPE (itype
), itype
,
9869 build_one_cst (TREE_TYPE (itype
)));
9870 t
= ubsan_instrument_vla (input_location
, t
);
9871 finish_expr_stmt (t
);
9874 /* Make sure that there was no overflow when creating to a signed
9875 index type. (For example, on a 32-bit machine, an array with
9876 size 2^32 - 1 is too big.) */
9877 else if (TREE_CODE (itype
) == INTEGER_CST
9878 && TREE_OVERFLOW (itype
))
9880 if (!(complain
& tf_error
))
9881 return error_mark_node
;
9882 error ("overflow in array dimension");
9883 TREE_OVERFLOW (itype
) = 0;
9887 /* Create and return the appropriate index type. */
9888 itype
= build_index_type (itype
);
9890 /* If the index type were dependent, we would have returned early, so
9891 remember that it isn't. */
9892 TYPE_DEPENDENT_P (itype
) = 0;
9893 TYPE_DEPENDENT_P_VALID (itype
) = 1;
9898 compute_array_index_type (tree name
, tree size
, tsubst_flags_t complain
)
9900 return compute_array_index_type_loc (input_location
, name
, size
, complain
);
9903 /* Returns the scope (if any) in which the entity declared by
9904 DECLARATOR will be located. If the entity was declared with an
9905 unqualified name, NULL_TREE is returned. */
9908 get_scope_of_declarator (const cp_declarator
*declarator
)
9910 while (declarator
&& declarator
->kind
!= cdk_id
)
9911 declarator
= declarator
->declarator
;
9913 /* If the declarator-id is a SCOPE_REF, the scope in which the
9914 declaration occurs is the first operand. */
9916 && declarator
->u
.id
.qualifying_scope
)
9917 return declarator
->u
.id
.qualifying_scope
;
9919 /* Otherwise, the declarator is not a qualified name; the entity will
9920 be declared in the current scope. */
9924 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
9925 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
9929 create_array_type_for_decl (tree name
, tree type
, tree size
, location_t loc
)
9931 tree itype
= NULL_TREE
;
9933 /* If things have already gone awry, bail now. */
9934 if (type
== error_mark_node
|| size
== error_mark_node
)
9935 return error_mark_node
;
9937 /* 8.3.4/1: If the type of the identifier of D contains the auto
9938 type-specifier, the program is ill-formed. */
9939 if (type_uses_auto (type
))
9942 error_at (loc
, "%qD declared as array of %qT", name
, type
);
9944 error ("creating array of %qT", type
);
9945 return error_mark_node
;
9948 /* If there are some types which cannot be array elements,
9949 issue an error-message and return. */
9950 switch (TREE_CODE (type
))
9954 error_at (loc
, "declaration of %qD as array of void", name
);
9956 error ("creating array of void");
9957 return error_mark_node
;
9961 error_at (loc
, "declaration of %qD as array of functions", name
);
9963 error ("creating array of functions");
9964 return error_mark_node
;
9966 case REFERENCE_TYPE
:
9968 error_at (loc
, "declaration of %qD as array of references", name
);
9970 error ("creating array of references");
9971 return error_mark_node
;
9975 error_at (loc
, "declaration of %qD as array of function members",
9978 error ("creating array of function members");
9979 return error_mark_node
;
9987 The constant expressions that specify the bounds of the arrays
9988 can be omitted only for the first member of the sequence. */
9989 if (TREE_CODE (type
) == ARRAY_TYPE
&& !TYPE_DOMAIN (type
))
9992 error_at (loc
, "declaration of %qD as multidimensional array must "
9993 "have bounds for all dimensions except the first",
9996 error ("multidimensional array must have bounds for all "
9997 "dimensions except the first");
9999 return error_mark_node
;
10002 /* Figure out the index type for the array. */
10004 itype
= compute_array_index_type_loc (loc
, name
, size
,
10005 tf_warning_or_error
);
10008 T is called the array element type; this type shall not be [...] an
10009 abstract class type. */
10010 abstract_virtuals_error (name
, type
);
10012 return build_cplus_array_type (type
, itype
);
10015 /* Returns the smallest location that is not UNKNOWN_LOCATION. */
10018 min_location (location_t loca
, location_t locb
)
10020 if (loca
== UNKNOWN_LOCATION
10021 || (locb
!= UNKNOWN_LOCATION
10022 && linemap_location_before_p (line_table
, locb
, loca
)))
10027 /* Returns the smallest location != UNKNOWN_LOCATION among the
10028 three stored in LOCATIONS[ds_const], LOCATIONS[ds_volatile],
10029 and LOCATIONS[ds_restrict]. */
10032 smallest_type_quals_location (int type_quals
, const location_t
* locations
)
10034 location_t loc
= UNKNOWN_LOCATION
;
10036 if (type_quals
& TYPE_QUAL_CONST
)
10037 loc
= locations
[ds_const
];
10039 if (type_quals
& TYPE_QUAL_VOLATILE
)
10040 loc
= min_location (loc
, locations
[ds_volatile
]);
10042 if (type_quals
& TYPE_QUAL_RESTRICT
)
10043 loc
= min_location (loc
, locations
[ds_restrict
]);
10048 /* Check that it's OK to declare a function with the indicated TYPE
10049 and TYPE_QUALS. SFK indicates the kind of special function (if any)
10050 that this function is. OPTYPE is the type given in a conversion
10051 operator declaration, or the class type for a constructor/destructor.
10052 Returns the actual return type of the function; that may be different
10053 than TYPE if an error occurs, or for certain special functions. */
10056 check_special_function_return_type (special_function_kind sfk
,
10060 const location_t
* locations
)
10064 case sfk_constructor
:
10066 error ("return type specification for constructor invalid");
10067 else if (type_quals
!= TYPE_UNQUALIFIED
)
10068 error_at (smallest_type_quals_location (type_quals
, locations
),
10069 "qualifiers are not allowed on constructor declaration");
10071 if (targetm
.cxx
.cdtor_returns_this ())
10072 type
= build_pointer_type (optype
);
10074 type
= void_type_node
;
10077 case sfk_destructor
:
10079 error ("return type specification for destructor invalid");
10080 else if (type_quals
!= TYPE_UNQUALIFIED
)
10081 error_at (smallest_type_quals_location (type_quals
, locations
),
10082 "qualifiers are not allowed on destructor declaration");
10084 /* We can't use the proper return type here because we run into
10085 problems with ambiguous bases and covariant returns. */
10086 if (targetm
.cxx
.cdtor_returns_this ())
10087 type
= build_pointer_type (void_type_node
);
10089 type
= void_type_node
;
10092 case sfk_conversion
:
10094 error ("return type specified for %<operator %T%>", optype
);
10095 else if (type_quals
!= TYPE_UNQUALIFIED
)
10096 error_at (smallest_type_quals_location (type_quals
, locations
),
10097 "qualifiers are not allowed on declaration of "
10098 "%<operator %T%>", optype
);
10103 case sfk_deduction_guide
:
10105 error ("return type specified for deduction guide");
10106 else if (type_quals
!= TYPE_UNQUALIFIED
)
10107 error_at (smallest_type_quals_location (type_quals
, locations
),
10108 "qualifiers are not allowed on declaration of "
10109 "deduction guide");
10110 if (TREE_CODE (optype
) == TEMPLATE_TEMPLATE_PARM
)
10112 error ("template template parameter %qT in declaration of "
10113 "deduction guide", optype
);
10114 type
= error_mark_node
;
10117 type
= make_template_placeholder (CLASSTYPE_TI_TEMPLATE (optype
));
10118 for (int i
= 0; i
< ds_last
; ++i
)
10119 if (i
!= ds_explicit
&& locations
[i
])
10120 error_at (locations
[i
],
10121 "decl-specifier in declaration of deduction guide");
10125 gcc_unreachable ();
10131 /* A variable or data member (whose unqualified name is IDENTIFIER)
10132 has been declared with the indicated TYPE. If the TYPE is not
10133 acceptable, issue an error message and return a type to use for
10134 error-recovery purposes. */
10137 check_var_type (tree identifier
, tree type
)
10139 if (VOID_TYPE_P (type
))
10142 error ("unnamed variable or field declared void");
10143 else if (identifier_p (identifier
))
10145 gcc_assert (!IDENTIFIER_ANY_OP_P (identifier
));
10146 error ("variable or field %qE declared void", identifier
);
10149 error ("variable or field declared void");
10150 type
= error_mark_node
;
10156 /* Handle declaring DECL as an inline variable. */
10159 mark_inline_variable (tree decl
, location_t loc
)
10161 bool inlinep
= true;
10162 if (! toplevel_bindings_p ())
10164 error_at (loc
, "%<inline%> specifier invalid for variable "
10165 "%qD declared at block scope", decl
);
10168 else if (cxx_dialect
< cxx17
)
10169 pedwarn (loc
, 0, "inline variables are only available "
10170 "with -std=c++17 or -std=gnu++17");
10173 retrofit_lang_decl (decl
);
10174 SET_DECL_VAR_DECLARED_INLINE_P (decl
);
10179 /* Assign a typedef-given name to a class or enumeration type declared
10180 as anonymous at first. This was split out of grokdeclarator
10181 because it is also used in libcc1. */
10184 name_unnamed_type (tree type
, tree decl
)
10186 gcc_assert (TYPE_UNNAMED_P (type
));
10188 /* Replace the anonymous name with the real name everywhere. */
10189 for (tree t
= TYPE_MAIN_VARIANT (type
); t
; t
= TYPE_NEXT_VARIANT (t
))
10191 if (anon_aggrname_p (TYPE_IDENTIFIER (t
)))
10192 /* We do not rename the debug info representing the
10193 unnamed tagged type because the standard says in
10194 [dcl.typedef] that the naming applies only for
10195 linkage purposes. */
10196 /*debug_hooks->set_name (t, decl);*/
10197 TYPE_NAME (t
) = decl
;
10200 if (TYPE_LANG_SPECIFIC (type
))
10201 TYPE_WAS_UNNAMED (type
) = 1;
10203 /* If this is a typedef within a template class, the nested
10204 type is a (non-primary) template. The name for the
10205 template needs updating as well. */
10206 if (TYPE_LANG_SPECIFIC (type
) && CLASSTYPE_TEMPLATE_INFO (type
))
10207 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type
))
10208 = TYPE_IDENTIFIER (type
);
10210 /* Adjust linkage now that we aren't unnamed anymore. */
10211 reset_type_linkage (type
);
10213 /* FIXME remangle member functions; member functions of a
10214 type with external linkage have external linkage. */
10216 /* Check that our job is done, and that it would fail if we
10217 attempted to do it again. */
10218 gcc_assert (!TYPE_UNNAMED_P (type
));
10221 /* Given declspecs and a declarator (abstract or otherwise), determine
10222 the name and type of the object declared and construct a DECL node
10225 DECLSPECS points to the representation of declaration-specifier
10226 sequence that precedes declarator.
10228 DECL_CONTEXT says which syntactic context this declaration is in:
10229 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
10230 FUNCDEF for a function definition. Like NORMAL but a few different
10231 error messages in each case. Return value may be zero meaning
10232 this definition is too screwy to try to parse.
10233 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
10234 handle member functions (which have FIELD context).
10235 Return value may be zero meaning this definition is too screwy to
10237 PARM for a parameter declaration (either within a function prototype
10238 or before a function body). Make a PARM_DECL, or return void_type_node.
10239 TPARM for a template parameter declaration.
10240 CATCHPARM for a parameter declaration before a catch clause.
10241 TYPENAME if for a typename (in a cast or sizeof).
10242 Don't make a DECL node; just return the ..._TYPE node.
10243 FIELD for a struct or union field; make a FIELD_DECL.
10244 BITFIELD for a field with specified width.
10246 INITIALIZED is as for start_decl.
10248 ATTRLIST is a pointer to the list of attributes, which may be NULL
10249 if there are none; *ATTRLIST may be modified if attributes from inside
10250 the declarator should be applied to the declaration.
10252 When this function is called, scoping variables (such as
10253 CURRENT_CLASS_TYPE) should reflect the scope in which the
10254 declaration occurs, not the scope in which the new declaration will
10255 be placed. For example, on:
10257 void S::f() { ... }
10259 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
10262 Returns a DECL (if a declarator is present), a TYPE (if there is no
10263 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
10267 grokdeclarator (const cp_declarator
*declarator
,
10268 cp_decl_specifier_seq
*declspecs
,
10269 enum decl_context decl_context
,
10273 tree type
= NULL_TREE
;
10275 int explicit_intN
= 0;
10276 int virtualp
, explicitp
, friendp
, inlinep
, staticp
;
10277 int explicit_int
= 0;
10278 int explicit_char
= 0;
10279 int defaulted_int
= 0;
10281 tree typedef_decl
= NULL_TREE
;
10282 const char *name
= NULL
;
10283 tree typedef_type
= NULL_TREE
;
10284 /* True if this declarator is a function definition. */
10285 bool funcdef_flag
= false;
10286 cp_declarator_kind innermost_code
= cdk_error
;
10289 /* See the code below that used this. */
10290 tree decl_attr
= NULL_TREE
;
10293 /* Keep track of what sort of function is being processed
10294 so that we can warn about default return values, or explicit
10295 return values which do not match prescribed defaults. */
10296 special_function_kind sfk
= sfk_none
;
10298 tree dname
= NULL_TREE
;
10299 tree ctor_return_type
= NULL_TREE
;
10300 enum overload_flags flags
= NO_SPECIAL
;
10301 /* cv-qualifiers that apply to the declarator, for a declaration of
10302 a member function. */
10303 cp_cv_quals memfn_quals
= TYPE_UNQUALIFIED
;
10304 /* virt-specifiers that apply to the declarator, for a declaration of
10305 a member function. */
10306 cp_virt_specifiers virt_specifiers
= VIRT_SPEC_UNSPECIFIED
;
10307 /* ref-qualifier that applies to the declarator, for a declaration of
10308 a member function. */
10309 cp_ref_qualifier rqual
= REF_QUAL_NONE
;
10310 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
10311 int type_quals
= TYPE_UNQUALIFIED
;
10312 tree raises
= NULL_TREE
;
10313 int template_count
= 0;
10314 tree returned_attrs
= NULL_TREE
;
10315 tree parms
= NULL_TREE
;
10316 const cp_declarator
*id_declarator
;
10317 /* The unqualified name of the declarator; either an
10318 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
10319 tree unqualified_id
;
10320 /* The class type, if any, in which this entity is located,
10321 or NULL_TREE if none. Note that this value may be different from
10322 the current class type; for example if an attempt is made to declare
10323 "A::f" inside "B", this value will be "A". */
10324 tree ctype
= current_class_type
;
10325 /* The NAMESPACE_DECL for the namespace in which this entity is
10326 located. If an unqualified name is used to declare the entity,
10327 this value will be NULL_TREE, even if the entity is located at
10328 namespace scope. */
10329 tree in_namespace
= NULL_TREE
;
10330 cp_storage_class storage_class
;
10331 bool unsigned_p
, signed_p
, short_p
, long_p
, thread_p
;
10332 bool type_was_error_mark_node
= false;
10333 bool parameter_pack_p
= declarator
? declarator
->parameter_pack_p
: false;
10334 bool template_type_arg
= false;
10335 bool template_parm_flag
= false;
10336 bool typedef_p
= decl_spec_seq_has_spec_p (declspecs
, ds_typedef
);
10337 bool constexpr_p
= decl_spec_seq_has_spec_p (declspecs
, ds_constexpr
);
10338 bool late_return_type_p
= false;
10339 bool array_parameter_p
= false;
10340 location_t saved_loc
= input_location
;
10341 tree reqs
= NULL_TREE
;
10343 signed_p
= decl_spec_seq_has_spec_p (declspecs
, ds_signed
);
10344 unsigned_p
= decl_spec_seq_has_spec_p (declspecs
, ds_unsigned
);
10345 short_p
= decl_spec_seq_has_spec_p (declspecs
, ds_short
);
10346 long_p
= decl_spec_seq_has_spec_p (declspecs
, ds_long
);
10347 longlong
= decl_spec_seq_has_spec_p (declspecs
, ds_long_long
);
10348 explicit_intN
= declspecs
->explicit_intN_p
;
10349 thread_p
= decl_spec_seq_has_spec_p (declspecs
, ds_thread
);
10351 // Was concept_p specified? Note that ds_concept
10352 // implies ds_constexpr!
10353 bool concept_p
= decl_spec_seq_has_spec_p (declspecs
, ds_concept
);
10355 constexpr_p
= true;
10357 if (decl_spec_seq_has_spec_p (declspecs
, ds_const
))
10358 type_quals
|= TYPE_QUAL_CONST
;
10359 if (decl_spec_seq_has_spec_p (declspecs
, ds_volatile
))
10360 type_quals
|= TYPE_QUAL_VOLATILE
;
10361 if (decl_spec_seq_has_spec_p (declspecs
, ds_restrict
))
10362 type_quals
|= TYPE_QUAL_RESTRICT
;
10364 if (decl_context
== FUNCDEF
)
10365 funcdef_flag
= true, decl_context
= NORMAL
;
10366 else if (decl_context
== MEMFUNCDEF
)
10367 funcdef_flag
= true, decl_context
= FIELD
;
10368 else if (decl_context
== BITFIELD
)
10369 bitfield
= 1, decl_context
= FIELD
;
10370 else if (decl_context
== TEMPLATE_TYPE_ARG
)
10371 template_type_arg
= true, decl_context
= TYPENAME
;
10372 else if (decl_context
== TPARM
)
10373 template_parm_flag
= true, decl_context
= PARM
;
10375 if (initialized
> 1)
10376 funcdef_flag
= true;
10378 location_t typespec_loc
= smallest_type_quals_location (type_quals
,
10379 declspecs
->locations
);
10380 if (typespec_loc
== UNKNOWN_LOCATION
)
10381 typespec_loc
= declspecs
->locations
[ds_type_spec
];
10382 if (typespec_loc
== UNKNOWN_LOCATION
)
10383 typespec_loc
= input_location
;
10385 /* Look inside a declarator for the name being declared
10386 and get it as a string, for an error message. */
10387 for (id_declarator
= declarator
;
10389 id_declarator
= id_declarator
->declarator
)
10391 if (id_declarator
->kind
!= cdk_id
)
10392 innermost_code
= id_declarator
->kind
;
10394 switch (id_declarator
->kind
)
10397 if (id_declarator
->declarator
10398 && id_declarator
->declarator
->kind
== cdk_id
)
10400 sfk
= id_declarator
->declarator
->u
.id
.sfk
;
10401 if (sfk
== sfk_destructor
)
10408 tree qualifying_scope
= id_declarator
->u
.id
.qualifying_scope
;
10409 tree decl
= id_declarator
->u
.id
.unqualified_name
;
10412 if (qualifying_scope
)
10414 if (check_for_bare_parameter_packs (qualifying_scope
,
10415 id_declarator
->id_loc
))
10416 return error_mark_node
;
10417 if (at_function_scope_p ())
10421 A declarator-id shall not be qualified except
10424 None of the cases are permitted in block
10426 if (qualifying_scope
== global_namespace
)
10427 error ("invalid use of qualified-name %<::%D%>",
10429 else if (TYPE_P (qualifying_scope
))
10430 error ("invalid use of qualified-name %<%T::%D%>",
10431 qualifying_scope
, decl
);
10433 error ("invalid use of qualified-name %<%D::%D%>",
10434 qualifying_scope
, decl
);
10435 return error_mark_node
;
10437 else if (TYPE_P (qualifying_scope
))
10439 ctype
= qualifying_scope
;
10440 if (!MAYBE_CLASS_TYPE_P (ctype
))
10442 error ("%q#T is not a class or a namespace", ctype
);
10445 else if (innermost_code
!= cdk_function
10446 && current_class_type
10447 && !uniquely_derived_from_p (ctype
,
10448 current_class_type
))
10450 error ("invalid use of qualified-name %<%T::%D%>",
10451 qualifying_scope
, decl
);
10452 return error_mark_node
;
10455 else if (TREE_CODE (qualifying_scope
) == NAMESPACE_DECL
)
10456 in_namespace
= qualifying_scope
;
10458 switch (TREE_CODE (decl
))
10462 if (innermost_code
!= cdk_function
)
10464 error ("declaration of %qD as non-function", decl
);
10465 return error_mark_node
;
10467 else if (!qualifying_scope
10468 && !(current_class_type
&& at_class_scope_p ()))
10470 error ("declaration of %qD as non-member", decl
);
10471 return error_mark_node
;
10474 tree type
= TREE_OPERAND (decl
, 0);
10476 type
= constructor_name (type
);
10477 name
= identifier_to_locale (IDENTIFIER_POINTER (type
));
10482 case TEMPLATE_ID_EXPR
:
10484 tree fns
= TREE_OPERAND (decl
, 0);
10487 if (!identifier_p (dname
))
10488 dname
= OVL_NAME (dname
);
10490 /* Fall through. */
10492 case IDENTIFIER_NODE
:
10493 if (identifier_p (decl
))
10496 if (IDENTIFIER_KEYWORD_P (dname
))
10498 error ("declarator-id missing; using reserved word %qD",
10500 name
= identifier_to_locale (IDENTIFIER_POINTER (dname
));
10502 else if (!IDENTIFIER_CONV_OP_P (dname
))
10503 name
= identifier_to_locale (IDENTIFIER_POINTER (dname
));
10506 gcc_assert (flags
== NO_SPECIAL
);
10507 flags
= TYPENAME_FLAG
;
10508 sfk
= sfk_conversion
;
10509 tree glob
= get_global_binding (dname
);
10510 if (glob
&& TREE_CODE (glob
) == TYPE_DECL
)
10511 name
= identifier_to_locale (IDENTIFIER_POINTER (dname
));
10513 name
= "<invalid operator>";
10518 gcc_unreachable ();
10525 case cdk_reference
:
10530 name
= "structured binding";
10534 return error_mark_node
;
10537 gcc_unreachable ();
10539 if (id_declarator
->kind
== cdk_id
)
10545 The declarator in a function-definition shall have the form
10546 D1 ( parameter-declaration-clause) ... */
10547 if (funcdef_flag
&& innermost_code
!= cdk_function
)
10549 error ("function definition does not declare parameters");
10550 return error_mark_node
;
10553 if (flags
== TYPENAME_FLAG
10554 && innermost_code
!= cdk_function
10555 && ! (ctype
&& !declspecs
->any_specifiers_p
))
10557 error ("declaration of %qD as non-function", dname
);
10558 return error_mark_node
;
10561 if (dname
&& identifier_p (dname
))
10563 if (UDLIT_OPER_P (dname
)
10564 && innermost_code
!= cdk_function
)
10566 error ("declaration of %qD as non-function", dname
);
10567 return error_mark_node
;
10570 if (IDENTIFIER_ANY_OP_P (dname
))
10574 error ("declaration of %qD as %<typedef%>", dname
);
10575 return error_mark_node
;
10577 else if (decl_context
== PARM
|| decl_context
== CATCHPARM
)
10579 error ("declaration of %qD as parameter", dname
);
10580 return error_mark_node
;
10585 /* Anything declared one level down from the top level
10586 must be one of the parameters of a function
10587 (because the body is at least two levels down). */
10589 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
10590 by not allowing C++ class definitions to specify their parameters
10591 with xdecls (must be spec.d in the parmlist).
10593 Since we now wait to push a class scope until we are sure that
10594 we are in a legitimate method context, we must set oldcname
10595 explicitly (since current_class_name is not yet alive).
10597 We also want to avoid calling this a PARM if it is in a namespace. */
10599 if (decl_context
== NORMAL
&& !toplevel_bindings_p ())
10601 cp_binding_level
*b
= current_binding_level
;
10602 current_binding_level
= b
->level_chain
;
10603 if (current_binding_level
!= 0 && toplevel_bindings_p ())
10604 decl_context
= PARM
;
10605 current_binding_level
= b
;
10609 name
= decl_context
== PARM
? "parameter" : "type name";
10611 if (concept_p
&& typedef_p
)
10613 error_at (declspecs
->locations
[ds_concept
],
10614 "%<concept%> cannot appear in a typedef declaration");
10615 return error_mark_node
;
10618 if (constexpr_p
&& typedef_p
)
10620 error_at (declspecs
->locations
[ds_constexpr
],
10621 "%<constexpr%> cannot appear in a typedef declaration");
10622 return error_mark_node
;
10625 /* If there were multiple types specified in the decl-specifier-seq,
10626 issue an error message. */
10627 if (declspecs
->multiple_types_p
)
10629 error ("two or more data types in declaration of %qs", name
);
10630 return error_mark_node
;
10633 if (declspecs
->conflicting_specifiers_p
)
10635 error ("conflicting specifiers in declaration of %qs", name
);
10636 return error_mark_node
;
10639 /* Extract the basic type from the decl-specifier-seq. */
10640 type
= declspecs
->type
;
10641 if (type
== error_mark_node
)
10644 type_was_error_mark_node
= true;
10646 cp_warn_deprecated_use (type
);
10647 if (type
&& TREE_CODE (type
) == TYPE_DECL
)
10649 typedef_decl
= type
;
10650 type
= TREE_TYPE (typedef_decl
);
10651 if (DECL_ARTIFICIAL (typedef_decl
))
10652 cp_warn_deprecated_use (type
);
10654 /* No type at all: default to `int', and set DEFAULTED_INT
10655 because it was not a user-defined typedef. */
10656 if (type
== NULL_TREE
)
10658 if (signed_p
|| unsigned_p
|| long_p
|| short_p
)
10660 /* These imply 'int'. */
10661 type
= integer_type_node
;
10664 /* If we just have "complex", it is equivalent to "complex double". */
10665 else if (!longlong
&& !explicit_intN
10666 && decl_spec_seq_has_spec_p (declspecs
, ds_complex
))
10668 type
= double_type_node
;
10669 pedwarn (declspecs
->locations
[ds_complex
], OPT_Wpedantic
,
10670 "ISO C++ does not support plain %<complex%> meaning "
10671 "%<double complex%>");
10674 /* Gather flags. */
10675 explicit_int
= declspecs
->explicit_int_p
;
10676 explicit_char
= declspecs
->explicit_char_p
;
10679 /* See the code below that used this. */
10681 decl_attr
= DECL_ATTRIBUTES (typedef_decl
);
10683 typedef_type
= type
;
10685 if (sfk
== sfk_conversion
|| sfk
== sfk_deduction_guide
)
10686 ctor_return_type
= TREE_TYPE (dname
);
10688 ctor_return_type
= ctype
;
10690 if (sfk
!= sfk_none
)
10692 type
= check_special_function_return_type (sfk
, type
,
10695 declspecs
->locations
);
10696 type_quals
= TYPE_UNQUALIFIED
;
10698 else if (type
== NULL_TREE
)
10704 /* We handle `main' specially here, because 'main () { }' is so
10705 common. With no options, it is allowed. With -Wreturn-type,
10706 it is a warning. It is only an error with -pedantic-errors. */
10707 is_main
= (funcdef_flag
10708 && dname
&& identifier_p (dname
)
10709 && MAIN_NAME_P (dname
)
10710 && ctype
== NULL_TREE
10711 && in_namespace
== NULL_TREE
10712 && current_namespace
== global_namespace
);
10714 if (type_was_error_mark_node
)
10715 /* We've already issued an error, don't complain more. */;
10716 else if (in_system_header_at (input_location
) || flag_ms_extensions
)
10717 /* Allow it, sigh. */;
10718 else if (! is_main
)
10719 permerror (input_location
, "ISO C++ forbids declaration of %qs with no type", name
);
10721 pedwarn (input_location
, OPT_Wpedantic
,
10722 "ISO C++ forbids declaration of %qs with no type", name
);
10724 warning (OPT_Wreturn_type
,
10725 "ISO C++ forbids declaration of %qs with no type", name
);
10727 if (type_was_error_mark_node
&& template_parm_flag
)
10728 /* FIXME we should be able to propagate the error_mark_node as is
10729 for other contexts too. */
10730 type
= error_mark_node
;
10732 type
= integer_type_node
;
10739 if (! int_n_enabled_p
[declspecs
->int_n_idx
])
10741 error ("%<__int%d%> is not supported by this target",
10742 int_n_data
[declspecs
->int_n_idx
].bitsize
);
10743 explicit_intN
= false;
10745 else if (pedantic
&& ! in_system_header_at (input_location
))
10746 pedwarn (input_location
, OPT_Wpedantic
,
10747 "ISO C++ does not support %<__int%d%> for %qs",
10748 int_n_data
[declspecs
->int_n_idx
].bitsize
, name
);
10751 /* Now process the modifiers that were specified
10752 and check for invalid combinations. */
10754 /* Long double is a special combination. */
10755 if (long_p
&& !longlong
&& TYPE_MAIN_VARIANT (type
) == double_type_node
)
10758 type
= cp_build_qualified_type (long_double_type_node
,
10759 cp_type_quals (type
));
10762 /* Check all other uses of type modifiers. */
10764 if (unsigned_p
|| signed_p
|| long_p
|| short_p
)
10771 loc
= declspecs
->locations
[ds_unsigned
];
10776 loc
= declspecs
->locations
[ds_signed
];
10781 loc
= declspecs
->locations
[ds_long_long
];
10786 loc
= declspecs
->locations
[ds_long
];
10788 else /* if (short_p) */
10791 loc
= declspecs
->locations
[ds_short
];
10796 if (signed_p
&& unsigned_p
)
10798 gcc_rich_location
richloc (declspecs
->locations
[ds_signed
]);
10799 richloc
.add_range (declspecs
->locations
[ds_unsigned
]);
10800 error_at (&richloc
,
10801 "%<signed%> and %<unsigned%> specified together");
10803 else if (long_p
&& short_p
)
10805 gcc_rich_location
richloc (declspecs
->locations
[ds_long
]);
10806 richloc
.add_range (declspecs
->locations
[ds_short
]);
10807 error_at (&richloc
, "%<long%> and %<short%> specified together");
10809 else if (TREE_CODE (type
) != INTEGER_TYPE
10810 || type
== char8_type_node
10811 || type
== char16_type_node
10812 || type
== char32_type_node
10813 || ((long_p
|| short_p
)
10814 && (explicit_char
|| explicit_intN
)))
10815 error_at (loc
, "%qs specified with %qT", key
, type
);
10816 else if (!explicit_int
&& !defaulted_int
10817 && !explicit_char
&& !explicit_intN
)
10821 pedwarn (loc
, OPT_Wpedantic
, "%qs specified with %qT",
10823 ok
= !flag_pedantic_errors
;
10825 else if (declspecs
->decltype_p
)
10826 error_at (loc
, "%qs specified with %<decltype%>", key
);
10828 error_at (loc
, "%qs specified with %<typeof%>", key
);
10833 /* Discard the type modifiers if they are invalid. */
10836 unsigned_p
= false;
10844 /* Decide whether an integer type is signed or not.
10845 Optionally treat bitfields as signed by default. */
10849 It is implementation-defined whether a plain (neither
10850 explicitly signed or unsigned) char, short, int, or long
10851 bit-field is signed or unsigned.
10853 Naturally, we extend this to long long as well. Note that
10854 this does not include wchar_t. */
10855 || (bitfield
&& !flag_signed_bitfields
10857 /* A typedef for plain `int' without `signed' can be
10858 controlled just like plain `int', but a typedef for
10859 `signed int' cannot be so controlled. */
10861 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
))
10862 && TREE_CODE (type
) == INTEGER_TYPE
10863 && !same_type_p (TYPE_MAIN_VARIANT (type
), wchar_type_node
)))
10866 type
= int_n_trees
[declspecs
->int_n_idx
].unsigned_type
;
10868 type
= long_long_unsigned_type_node
;
10870 type
= long_unsigned_type_node
;
10872 type
= short_unsigned_type_node
;
10873 else if (type
== char_type_node
)
10874 type
= unsigned_char_type_node
;
10875 else if (typedef_decl
)
10876 type
= unsigned_type_for (type
);
10878 type
= unsigned_type_node
;
10880 else if (signed_p
&& type
== char_type_node
)
10881 type
= signed_char_type_node
;
10882 else if (explicit_intN
)
10883 type
= int_n_trees
[declspecs
->int_n_idx
].signed_type
;
10885 type
= long_long_integer_type_node
;
10887 type
= long_integer_type_node
;
10889 type
= short_integer_type_node
;
10891 if (decl_spec_seq_has_spec_p (declspecs
, ds_complex
))
10893 if (TREE_CODE (type
) != INTEGER_TYPE
&& TREE_CODE (type
) != REAL_TYPE
)
10894 error ("complex invalid for %qs", name
);
10895 /* If a modifier is specified, the resulting complex is the complex
10896 form of TYPE. E.g, "complex short" is "complex short int". */
10897 else if (type
== integer_type_node
)
10898 type
= complex_integer_type_node
;
10899 else if (type
== float_type_node
)
10900 type
= complex_float_type_node
;
10901 else if (type
== double_type_node
)
10902 type
= complex_double_type_node
;
10903 else if (type
== long_double_type_node
)
10904 type
= complex_long_double_type_node
;
10906 type
= build_complex_type (type
);
10909 /* If we're using the injected-class-name to form a compound type or a
10910 declaration, replace it with the underlying class so we don't get
10911 redundant typedefs in the debug output. But if we are returning the
10912 type unchanged, leave it alone so that it's available to
10913 maybe_get_template_decl_from_type_decl. */
10914 if (CLASS_TYPE_P (type
)
10915 && DECL_SELF_REFERENCE_P (TYPE_NAME (type
))
10916 && type
== TREE_TYPE (TYPE_NAME (type
))
10917 && (declarator
|| type_quals
))
10918 type
= DECL_ORIGINAL_TYPE (TYPE_NAME (type
));
10920 type_quals
|= cp_type_quals (type
);
10921 type
= cp_build_qualified_type_real
10922 (type
, type_quals
, ((((typedef_decl
&& !DECL_ARTIFICIAL (typedef_decl
))
10923 || declspecs
->decltype_p
)
10924 ? tf_ignore_bad_quals
: 0) | tf_warning_or_error
));
10925 /* We might have ignored or rejected some of the qualifiers. */
10926 type_quals
= cp_type_quals (type
);
10928 if (cxx_dialect
>= cxx17
&& type
&& is_auto (type
)
10929 && innermost_code
!= cdk_function
10930 && id_declarator
&& declarator
!= id_declarator
)
10931 if (tree tmpl
= CLASS_PLACEHOLDER_TEMPLATE (type
))
10933 error_at (typespec_loc
, "template placeholder type %qT must be followed "
10934 "by a simple declarator-id", type
);
10935 inform (DECL_SOURCE_LOCATION (tmpl
), "%qD declared here", tmpl
);
10939 inlinep
= decl_spec_seq_has_spec_p (declspecs
, ds_inline
);
10940 virtualp
= decl_spec_seq_has_spec_p (declspecs
, ds_virtual
);
10941 explicitp
= decl_spec_seq_has_spec_p (declspecs
, ds_explicit
);
10943 storage_class
= declspecs
->storage_class
;
10944 if (storage_class
== sc_static
)
10945 staticp
= 1 + (decl_context
== FIELD
);
10951 gcc_rich_location
richloc (declspecs
->locations
[ds_virtual
]);
10952 richloc
.add_range (declspecs
->locations
[ds_storage_class
]);
10953 error_at (&richloc
, "member %qD cannot be declared both %<virtual%> "
10954 "and %<static%>", dname
);
10955 storage_class
= sc_none
;
10958 if (constexpr_p
&& cxx_dialect
< cxx2a
)
10960 gcc_rich_location
richloc (declspecs
->locations
[ds_virtual
]);
10961 richloc
.add_range (declspecs
->locations
[ds_constexpr
]);
10962 pedwarn (&richloc
, OPT_Wpedantic
, "member %qD can be declared both "
10963 "%<virtual%> and %<constexpr%> only in -std=c++2a or "
10964 "-std=gnu++2a", dname
);
10967 friendp
= decl_spec_seq_has_spec_p (declspecs
, ds_friend
);
10969 /* Issue errors about use of storage classes for parameters. */
10970 if (decl_context
== PARM
)
10974 error_at (declspecs
->locations
[ds_typedef
],
10975 "typedef declaration invalid in parameter declaration");
10976 return error_mark_node
;
10978 else if (template_parm_flag
&& storage_class
!= sc_none
)
10980 error_at (min_location (declspecs
->locations
[ds_thread
],
10981 declspecs
->locations
[ds_storage_class
]),
10982 "storage class specified for template parameter %qs",
10984 return error_mark_node
;
10986 else if (storage_class
== sc_static
10987 || storage_class
== sc_extern
10990 error_at (min_location (declspecs
->locations
[ds_thread
],
10991 declspecs
->locations
[ds_storage_class
]),
10992 "storage class specified for parameter %qs", name
);
10993 return error_mark_node
;
10996 /* Function parameters cannot be concept. */
10998 error_at (declspecs
->locations
[ds_concept
],
10999 "a parameter cannot be declared %<concept%>");
11000 /* Function parameters cannot be constexpr. If we saw one, moan
11001 and pretend it wasn't there. */
11002 else if (constexpr_p
)
11004 error_at (declspecs
->locations
[ds_constexpr
],
11005 "a parameter cannot be declared %<constexpr%>");
11010 /* Give error if `virtual' is used outside of class declaration. */
11012 && (current_class_name
== NULL_TREE
|| decl_context
!= FIELD
))
11014 error_at (declspecs
->locations
[ds_virtual
],
11015 "%<virtual%> outside class declaration");
11019 if (innermost_code
== cdk_decomp
)
11021 location_t loc
= (declarator
->kind
== cdk_reference
11022 ? declarator
->declarator
->id_loc
: declarator
->id_loc
);
11024 error_at (declspecs
->locations
[ds_inline
],
11025 "structured binding declaration cannot be %<inline%>");
11027 error_at (declspecs
->locations
[ds_typedef
],
11028 "structured binding declaration cannot be %<typedef%>");
11030 error_at (declspecs
->locations
[ds_constexpr
], "structured "
11031 "binding declaration cannot be %<constexpr%>");
11033 error_at (declspecs
->locations
[ds_thread
],
11034 "structured binding declaration cannot be %qs",
11035 declspecs
->gnu_thread_keyword_p
11036 ? "__thread" : "thread_local");
11038 error_at (declspecs
->locations
[ds_concept
],
11039 "structured binding declaration cannot be %<concept%>");
11040 switch (storage_class
)
11045 error_at (loc
, "structured binding declaration cannot be "
11049 error_at (loc
, "structured binding declaration cannot be "
11053 error_at (loc
, "structured binding declaration cannot be "
11057 error_at (loc
, "structured binding declaration cannot be "
11061 error_at (loc
, "structured binding declaration cannot be "
11065 gcc_unreachable ();
11067 if (TREE_CODE (type
) != TEMPLATE_TYPE_PARM
11068 || TYPE_IDENTIFIER (type
) != auto_identifier
)
11070 if (type
!= error_mark_node
)
11072 error_at (loc
, "structured binding declaration cannot have "
11075 "type must be cv-qualified %<auto%> or reference to "
11076 "cv-qualified %<auto%>");
11078 type
= build_qualified_type (make_auto (), type_quals
);
11079 declspecs
->type
= type
;
11086 storage_class
= sc_none
;
11088 declspecs
->storage_class
= sc_none
;
11089 declspecs
->locations
[ds_thread
] = UNKNOWN_LOCATION
;
11092 /* Static anonymous unions are dealt with here. */
11093 if (staticp
&& decl_context
== TYPENAME
11095 && ANON_AGGR_TYPE_P (declspecs
->type
))
11096 decl_context
= FIELD
;
11098 /* Warn about storage classes that are invalid for certain
11099 kinds of declarations (parameters, typenames, etc.). */
11102 && storage_class
!= sc_extern
11103 && storage_class
!= sc_static
)
11106 error ("multiple storage classes in declaration of %qs", name
);
11109 if (decl_context
!= NORMAL
11110 && ((storage_class
!= sc_none
11111 && storage_class
!= sc_mutable
)
11114 if ((decl_context
== PARM
|| decl_context
== CATCHPARM
)
11115 && (storage_class
== sc_register
11116 || storage_class
== sc_auto
))
11118 else if (typedef_p
)
11120 else if (decl_context
== FIELD
11121 /* C++ allows static class elements. */
11122 && storage_class
== sc_static
)
11123 /* C++ also allows inlines and signed and unsigned elements,
11124 but in those cases we don't come in here. */
11129 = min_location (declspecs
->locations
[ds_thread
],
11130 declspecs
->locations
[ds_storage_class
]);
11131 if (decl_context
== FIELD
)
11132 error_at (loc
, "storage class specified for %qs", name
);
11133 else if (decl_context
== PARM
|| decl_context
== CATCHPARM
)
11134 error_at (loc
, "storage class specified for parameter %qs", name
);
11136 error_at (loc
, "storage class specified for typename");
11137 if (storage_class
== sc_register
11138 || storage_class
== sc_auto
11139 || storage_class
== sc_extern
11141 storage_class
= sc_none
;
11144 else if (storage_class
== sc_extern
&& funcdef_flag
11145 && ! toplevel_bindings_p ())
11146 error ("nested function %qs declared %<extern%>", name
);
11147 else if (toplevel_bindings_p ())
11149 if (storage_class
== sc_auto
)
11150 error ("top-level declaration of %qs specifies %<auto%>", name
);
11153 && storage_class
!= sc_extern
11154 && storage_class
!= sc_static
)
11156 if (declspecs
->gnu_thread_keyword_p
)
11157 pedwarn (declspecs
->locations
[ds_thread
],
11158 0, "function-scope %qs implicitly auto and "
11159 "declared %<__thread%>", name
);
11161 /* When thread_local is applied to a variable of block scope the
11162 storage-class-specifier static is implied if it does not appear
11164 storage_class
= declspecs
->storage_class
= sc_static
;
11168 if (storage_class
&& friendp
)
11170 error_at (min_location (declspecs
->locations
[ds_thread
],
11171 declspecs
->locations
[ds_storage_class
]),
11172 "storage class specifiers invalid in friend function "
11174 storage_class
= sc_none
;
11178 if (!id_declarator
)
11179 unqualified_id
= NULL_TREE
;
11182 unqualified_id
= id_declarator
->u
.id
.unqualified_name
;
11183 switch (TREE_CODE (unqualified_id
))
11186 unqualified_id
= TREE_OPERAND (unqualified_id
, 0);
11187 if (TYPE_P (unqualified_id
))
11188 unqualified_id
= constructor_name (unqualified_id
);
11191 case IDENTIFIER_NODE
:
11192 case TEMPLATE_ID_EXPR
:
11196 gcc_unreachable ();
11200 if (declspecs
->std_attributes
)
11202 location_t attr_loc
= declspecs
->locations
[ds_std_attribute
];
11203 if (warning_at (attr_loc
, OPT_Wattributes
, "attribute ignored"))
11204 inform (attr_loc
, "an attribute that appertains to a type-specifier "
11208 /* Determine the type of the entity declared by recurring on the
11210 for (; declarator
; declarator
= declarator
->declarator
)
11212 const cp_declarator
*inner_declarator
;
11215 if (type
== error_mark_node
)
11216 return error_mark_node
;
11218 attrs
= declarator
->attributes
;
11224 if (declarator
== NULL
|| declarator
->kind
== cdk_id
)
11225 attr_flags
|= (int) ATTR_FLAG_DECL_NEXT
;
11226 if (declarator
->kind
== cdk_function
)
11227 attr_flags
|= (int) ATTR_FLAG_FUNCTION_NEXT
;
11228 if (declarator
->kind
== cdk_array
)
11229 attr_flags
|= (int) ATTR_FLAG_ARRAY_NEXT
;
11230 returned_attrs
= decl_attributes (&type
,
11231 chainon (returned_attrs
, attrs
),
11235 inner_declarator
= declarator
->declarator
;
11237 /* We don't want to warn in parameter context because we don't
11238 yet know if the parse will succeed, and this might turn out
11239 to be a constructor call. */
11240 if (decl_context
!= PARM
11241 && decl_context
!= TYPENAME
11243 && declarator
->parenthesized
!= UNKNOWN_LOCATION
11244 /* If the type is class-like and the inner name used a
11245 global namespace qualifier, we need the parens.
11246 Unfortunately all we can tell is whether a qualified name
11247 was used or not. */
11248 && !(inner_declarator
11249 && inner_declarator
->kind
== cdk_id
11250 && inner_declarator
->u
.id
.qualifying_scope
11251 && (MAYBE_CLASS_TYPE_P (type
)
11252 || TREE_CODE (type
) == ENUMERAL_TYPE
)))
11253 warning_at (declarator
->parenthesized
, OPT_Wparentheses
,
11254 "unnecessary parentheses in declaration of %qs", name
);
11255 if (declarator
->kind
== cdk_id
|| declarator
->kind
== cdk_decomp
)
11258 switch (declarator
->kind
)
11261 type
= create_array_type_for_decl (dname
, type
,
11262 declarator
->u
.array
.bounds
,
11263 declarator
->id_loc
);
11264 if (!valid_array_size_p (input_location
, type
, dname
))
11265 type
= error_mark_node
;
11267 if (declarator
->std_attributes
)
11270 The optional attribute-specifier-seq appertains to the
11272 returned_attrs
= chainon (returned_attrs
,
11273 declarator
->std_attributes
);
11281 /* Declaring a function type. */
11283 input_location
= declspecs
->locations
[ds_type_spec
];
11284 abstract_virtuals_error (ACU_RETURN
, type
);
11285 input_location
= saved_loc
;
11287 /* Pick up type qualifiers which should be applied to `this'. */
11288 memfn_quals
= declarator
->u
.function
.qualifiers
;
11289 /* Pick up virt-specifiers. */
11290 virt_specifiers
= declarator
->u
.function
.virt_specifiers
;
11291 /* And ref-qualifier, too */
11292 rqual
= declarator
->u
.function
.ref_qualifier
;
11293 /* And tx-qualifier. */
11294 tree tx_qual
= declarator
->u
.function
.tx_qualifier
;
11295 /* Pick up the exception specifications. */
11296 raises
= declarator
->u
.function
.exception_specification
;
11297 /* If the exception-specification is ill-formed, let's pretend
11298 there wasn't one. */
11299 if (raises
== error_mark_node
)
11300 raises
= NULL_TREE
;
11303 error_at (location_of (reqs
), "requires-clause on return type");
11304 reqs
= declarator
->u
.function
.requires_clause
;
11306 /* Say it's a definition only for the CALL_EXPR
11307 closest to the identifier. */
11308 funcdecl_p
= inner_declarator
&& inner_declarator
->kind
== cdk_id
;
11310 /* Handle a late-specified return type. */
11311 tree late_return_type
= declarator
->u
.function
.late_return_type
;
11313 /* This is the case e.g. for
11314 using T = auto () -> int. */
11315 || inner_declarator
== NULL
)
11317 if (tree auto_node
= type_uses_auto (type
))
11319 if (!late_return_type
)
11321 if (current_class_type
11322 && LAMBDA_TYPE_P (current_class_type
))
11323 /* OK for C++11 lambdas. */;
11324 else if (cxx_dialect
< cxx14
)
11326 error_at (typespec_loc
, "%qs function uses "
11327 "%<auto%> type specifier without "
11328 "trailing return type", name
);
11329 inform (typespec_loc
,
11330 "deduced return type only available "
11331 "with -std=c++14 or -std=gnu++14");
11335 error_at (typespec_loc
, "virtual function "
11336 "cannot have deduced return type");
11340 else if (!is_auto (type
) && sfk
!= sfk_conversion
)
11342 error_at (typespec_loc
, "%qs function with trailing "
11343 "return type has %qT as its type rather "
11344 "than plain %<auto%>", name
, type
);
11345 return error_mark_node
;
11347 else if (is_auto (type
) && AUTO_IS_DECLTYPE (type
))
11350 error_at (typespec_loc
,
11351 "%qs function with trailing return type "
11352 "has %<decltype(auto)%> as its type "
11353 "rather than plain %<auto%>", name
);
11355 error_at (typespec_loc
,
11356 "invalid use of %<decltype(auto)%>");
11357 return error_mark_node
;
11359 tree tmpl
= CLASS_PLACEHOLDER_TEMPLATE (auto_node
);
11361 if (tree late_auto
= type_uses_auto (late_return_type
))
11362 tmpl
= CLASS_PLACEHOLDER_TEMPLATE (late_auto
);
11363 if (tmpl
&& funcdecl_p
)
11365 if (!dguide_name_p (unqualified_id
))
11367 error_at (declarator
->id_loc
, "deduced class "
11368 "type %qD in function return type",
11370 inform (DECL_SOURCE_LOCATION (tmpl
),
11371 "%qD declared here", tmpl
);
11372 return error_mark_node
;
11374 else if (!late_return_type
)
11376 error_at (declarator
->id_loc
, "deduction guide "
11377 "for %qT must have trailing return "
11378 "type", TREE_TYPE (tmpl
));
11379 inform (DECL_SOURCE_LOCATION (tmpl
),
11380 "%qD declared here", tmpl
);
11381 return error_mark_node
;
11383 else if (CLASS_TYPE_P (late_return_type
)
11384 && CLASSTYPE_TEMPLATE_INFO (late_return_type
)
11385 && (CLASSTYPE_TI_TEMPLATE (late_return_type
)
11389 error ("trailing return type %qT of deduction guide "
11390 "is not a specialization of %qT",
11391 late_return_type
, TREE_TYPE (tmpl
));
11394 else if (late_return_type
11395 && sfk
!= sfk_conversion
)
11397 if (cxx_dialect
< cxx11
)
11398 /* Not using maybe_warn_cpp0x because this should
11399 always be an error. */
11400 error_at (typespec_loc
,
11401 "trailing return type only available "
11402 "with -std=c++11 or -std=gnu++11");
11404 error_at (typespec_loc
, "%qs function with trailing "
11405 "return type not declared with %<auto%> "
11406 "type specifier", name
);
11407 return error_mark_node
;
11410 type
= splice_late_return_type (type
, late_return_type
);
11411 if (type
== error_mark_node
)
11412 return error_mark_node
;
11414 if (late_return_type
)
11416 late_return_type_p
= true;
11417 type_quals
= cp_type_quals (type
);
11420 if (type_quals
!= TYPE_UNQUALIFIED
)
11422 if (SCALAR_TYPE_P (type
) || VOID_TYPE_P (type
))
11423 warning_at (typespec_loc
, OPT_Wignored_qualifiers
, "type "
11424 "qualifiers ignored on function return type");
11425 /* We now know that the TYPE_QUALS don't apply to the
11426 decl, but to its return type. */
11427 type_quals
= TYPE_UNQUALIFIED
;
11430 /* Error about some types functions can't return. */
11432 if (TREE_CODE (type
) == FUNCTION_TYPE
)
11434 error_at (typespec_loc
, "%qs declared as function returning "
11435 "a function", name
);
11436 return error_mark_node
;
11438 if (TREE_CODE (type
) == ARRAY_TYPE
)
11440 error_at (typespec_loc
, "%qs declared as function returning "
11442 return error_mark_node
;
11445 if (ctype
== NULL_TREE
11446 && decl_context
== FIELD
11449 ctype
= current_class_type
;
11451 if (ctype
&& (sfk
== sfk_constructor
11452 || sfk
== sfk_destructor
))
11454 /* We are within a class's scope. If our declarator name
11455 is the same as the class name, and we are defining
11456 a function, then it is a constructor/destructor, and
11457 therefore returns a void type. */
11459 /* ISO C++ 12.4/2. A destructor may not be declared
11460 const or volatile. A destructor may not be static.
11461 A destructor may not be declared with ref-qualifier.
11463 ISO C++ 12.1. A constructor may not be declared
11464 const or volatile. A constructor may not be
11465 virtual. A constructor may not be static.
11466 A constructor may not be declared with ref-qualifier. */
11468 error ((flags
== DTOR_FLAG
)
11469 ? G_("destructor cannot be static member function")
11470 : G_("constructor cannot be static member function"));
11473 error ((flags
== DTOR_FLAG
)
11474 ? G_("destructors may not be cv-qualified")
11475 : G_("constructors may not be cv-qualified"));
11476 memfn_quals
= TYPE_UNQUALIFIED
;
11481 maybe_warn_cpp0x (CPP0X_REF_QUALIFIER
);
11482 error ((flags
== DTOR_FLAG
)
11483 ? G_("destructors may not be ref-qualified")
11484 : G_("constructors may not be ref-qualified"));
11485 rqual
= REF_QUAL_NONE
;
11488 if (decl_context
== FIELD
11489 && !member_function_or_else (ctype
,
11490 current_class_type
,
11492 return error_mark_node
;
11494 if (flags
!= DTOR_FLAG
)
11496 /* It's a constructor. */
11497 if (explicitp
== 1)
11501 permerror (declspecs
->locations
[ds_virtual
],
11502 "constructors cannot be declared %<virtual%>");
11505 if (decl_context
== FIELD
11506 && sfk
!= sfk_constructor
)
11507 return error_mark_node
;
11509 if (decl_context
== FIELD
)
11516 /* Cannot be both friend and virtual. */
11517 gcc_rich_location
richloc (declspecs
->locations
[ds_virtual
]);
11518 richloc
.add_range (declspecs
->locations
[ds_friend
]);
11519 error_at (&richloc
, "virtual functions cannot be friends");
11522 if (decl_context
== NORMAL
)
11523 error ("friend declaration not in class definition");
11524 if (current_function_decl
&& funcdef_flag
)
11526 error ("can%'t define friend function %qs in a local "
11527 "class definition", name
);
11531 else if (ctype
&& sfk
== sfk_conversion
)
11533 if (explicitp
== 1)
11535 maybe_warn_cpp0x (CPP0X_EXPLICIT_CONVERSION
);
11538 if (late_return_type_p
)
11539 error ("a conversion function cannot have a trailing return type");
11541 else if (sfk
== sfk_deduction_guide
)
11543 if (explicitp
== 1)
11547 tree pushed_scope
= NULL_TREE
;
11549 && decl_context
!= FIELD
11550 && inner_declarator
->u
.id
.qualifying_scope
11551 && CLASS_TYPE_P (inner_declarator
->u
.id
.qualifying_scope
))
11553 = push_scope (inner_declarator
->u
.id
.qualifying_scope
);
11555 arg_types
= grokparms (declarator
->u
.function
.parameters
, &parms
);
11558 pop_scope (pushed_scope
);
11560 if (inner_declarator
11561 && inner_declarator
->kind
== cdk_id
11562 && inner_declarator
->u
.id
.sfk
== sfk_destructor
11563 && arg_types
!= void_list_node
)
11565 error ("destructors may not have parameters");
11566 arg_types
= void_list_node
;
11570 type
= build_function_type (type
, arg_types
);
11572 tree attrs
= declarator
->std_attributes
;
11575 tree att
= build_tree_list (tx_qual
, NULL_TREE
);
11576 /* transaction_safe applies to the type, but
11577 transaction_safe_dynamic applies to the function. */
11578 if (is_attribute_p ("transaction_safe", tx_qual
))
11579 attrs
= chainon (attrs
, att
);
11581 returned_attrs
= chainon (returned_attrs
, att
);
11586 The optional attribute-specifier-seq appertains to
11587 the function type. */
11588 decl_attributes (&type
, attrs
, 0);
11591 type
= build_exception_variant (type
, raises
);
11596 case cdk_reference
:
11598 /* Filter out pointers-to-references and references-to-references.
11599 We can get these if a TYPE_DECL is used. */
11601 if (TYPE_REF_P (type
))
11603 if (declarator
->kind
!= cdk_reference
)
11605 error ("cannot declare pointer to %q#T", type
);
11606 type
= TREE_TYPE (type
);
11609 /* In C++0x, we allow reference to reference declarations
11610 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
11611 and template type arguments [14.3.1/4 temp.arg.type]. The
11612 check for direct reference to reference declarations, which
11613 are still forbidden, occurs below. Reasoning behind the change
11614 can be found in DR106, DR540, and the rvalue reference
11616 else if (cxx_dialect
== cxx98
)
11618 error ("cannot declare reference to %q#T", type
);
11619 type
= TREE_TYPE (type
);
11622 else if (VOID_TYPE_P (type
))
11624 if (declarator
->kind
== cdk_reference
)
11625 error ("cannot declare reference to %q#T", type
);
11626 else if (declarator
->kind
== cdk_ptrmem
)
11627 error ("cannot declare pointer to %q#T member", type
);
11630 /* We now know that the TYPE_QUALS don't apply to the decl,
11631 but to the target of the pointer. */
11632 type_quals
= TYPE_UNQUALIFIED
;
11634 /* This code used to handle METHOD_TYPE, but I don't think it's
11635 possible to get it here anymore. */
11636 gcc_assert (TREE_CODE (type
) != METHOD_TYPE
);
11637 if (declarator
->kind
== cdk_ptrmem
11638 && TREE_CODE (type
) == FUNCTION_TYPE
)
11640 memfn_quals
|= type_memfn_quals (type
);
11641 type
= build_memfn_type (type
,
11642 declarator
->u
.pointer
.class_type
,
11645 if (type
== error_mark_node
)
11646 return error_mark_node
;
11648 rqual
= REF_QUAL_NONE
;
11649 memfn_quals
= TYPE_UNQUALIFIED
;
11652 if (TREE_CODE (type
) == FUNCTION_TYPE
11653 && (type_memfn_quals (type
) != TYPE_UNQUALIFIED
11654 || type_memfn_rqual (type
) != REF_QUAL_NONE
))
11655 error (declarator
->kind
== cdk_reference
11656 ? G_("cannot declare reference to qualified function type %qT")
11657 : G_("cannot declare pointer to qualified function type %qT"),
11660 /* When the pointed-to type involves components of variable size,
11661 care must be taken to ensure that the size evaluation code is
11662 emitted early enough to dominate all the possible later uses
11663 and late enough for the variables on which it depends to have
11666 This is expected to happen automatically when the pointed-to
11667 type has a name/declaration of it's own, but special attention
11668 is required if the type is anonymous.
11670 We handle the NORMAL and FIELD contexts here by inserting a
11671 dummy statement that just evaluates the size at a safe point
11672 and ensures it is not deferred until e.g. within a deeper
11673 conditional context (c++/43555).
11675 We expect nothing to be needed here for PARM or TYPENAME.
11676 Evaluating the size at this point for TYPENAME would
11677 actually be incorrect, as we might be in the middle of an
11678 expression with side effects on the pointed-to type size
11679 "arguments" prior to the pointer declaration point and the
11680 size evaluation could end up prior to the side effects. */
11682 if (!TYPE_NAME (type
)
11683 && (decl_context
== NORMAL
|| decl_context
== FIELD
)
11684 && at_function_scope_p ()
11685 && variably_modified_type_p (type
, NULL_TREE
))
11687 TYPE_NAME (type
) = build_decl (UNKNOWN_LOCATION
, TYPE_DECL
,
11689 add_decl_expr (TYPE_NAME (type
));
11692 if (declarator
->kind
== cdk_reference
)
11694 /* In C++0x, the type we are creating a reference to might be
11695 a typedef which is itself a reference type. In that case,
11696 we follow the reference collapsing rules in
11697 [7.1.3/8 dcl.typedef] to create the final reference type:
11699 "If a typedef TD names a type that is a reference to a type
11700 T, an attempt to create the type 'lvalue reference to cv TD'
11701 creates the type 'lvalue reference to T,' while an attempt
11702 to create the type "rvalue reference to cv TD' creates the
11705 if (VOID_TYPE_P (type
))
11706 /* We already gave an error. */;
11707 else if (TYPE_REF_P (type
))
11709 if (declarator
->u
.reference
.rvalue_ref
)
11710 /* Leave type alone. */;
11712 type
= cp_build_reference_type (TREE_TYPE (type
), false);
11715 type
= cp_build_reference_type
11716 (type
, declarator
->u
.reference
.rvalue_ref
);
11718 /* In C++0x, we need this check for direct reference to
11719 reference declarations, which are forbidden by
11720 [8.3.2/5 dcl.ref]. Reference to reference declarations
11721 are only allowed indirectly through typedefs and template
11722 type arguments. Example:
11724 void foo(int & &); // invalid ref-to-ref decl
11726 typedef int & int_ref;
11727 void foo(int_ref &); // valid ref-to-ref decl
11729 if (inner_declarator
&& inner_declarator
->kind
== cdk_reference
)
11730 error ("cannot declare reference to %q#T, which is not "
11731 "a typedef or a template type argument", type
);
11733 else if (TREE_CODE (type
) == METHOD_TYPE
)
11734 type
= build_ptrmemfunc_type (build_pointer_type (type
));
11735 else if (declarator
->kind
== cdk_ptrmem
)
11737 gcc_assert (TREE_CODE (declarator
->u
.pointer
.class_type
)
11738 != NAMESPACE_DECL
);
11739 if (declarator
->u
.pointer
.class_type
== error_mark_node
)
11740 /* We will already have complained. */
11741 type
= error_mark_node
;
11743 type
= build_ptrmem_type (declarator
->u
.pointer
.class_type
,
11747 type
= build_pointer_type (type
);
11749 /* Process a list of type modifier keywords (such as
11750 const or volatile) that were given inside the `*' or `&'. */
11752 if (declarator
->u
.pointer
.qualifiers
)
11755 = cp_build_qualified_type (type
,
11756 declarator
->u
.pointer
.qualifiers
);
11757 type_quals
= cp_type_quals (type
);
11760 /* Apply C++11 attributes to the pointer, and not to the
11761 type pointed to. This is unlike what is done for GNU
11762 attributes above. It is to comply with [dcl.ptr]/1:
11764 [the optional attribute-specifier-seq (7.6.1) appertains
11765 to the pointer and not to the object pointed to]. */
11766 if (declarator
->std_attributes
)
11767 decl_attributes (&type
, declarator
->std_attributes
,
11777 gcc_unreachable ();
11781 /* A `constexpr' specifier used in an object declaration declares
11782 the object as `const'. */
11783 if (constexpr_p
&& innermost_code
!= cdk_function
)
11785 /* DR1688 says that a `constexpr' specifier in combination with
11786 `volatile' is valid. */
11788 if (!TYPE_REF_P (type
))
11790 type_quals
|= TYPE_QUAL_CONST
;
11791 type
= cp_build_qualified_type (type
, type_quals
);
11795 if (unqualified_id
&& TREE_CODE (unqualified_id
) == TEMPLATE_ID_EXPR
11796 && TREE_CODE (type
) != FUNCTION_TYPE
11797 && TREE_CODE (type
) != METHOD_TYPE
11798 && !variable_template_p (TREE_OPERAND (unqualified_id
, 0)))
11800 error ("template-id %qD used as a declarator",
11802 unqualified_id
= dname
;
11805 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
11806 qualified with a class-name, turn it into a METHOD_TYPE, unless
11807 we know that the function is static. We take advantage of this
11808 opportunity to do other processing that pertains to entities
11809 explicitly declared to be class members. Note that if DECLARATOR
11810 is non-NULL, we know it is a cdk_id declarator; otherwise, we
11811 would not have exited the loop above. */
11813 && declarator
->kind
== cdk_id
11814 && declarator
->u
.id
.qualifying_scope
11815 && MAYBE_CLASS_TYPE_P (declarator
->u
.id
.qualifying_scope
))
11817 ctype
= declarator
->u
.id
.qualifying_scope
;
11818 ctype
= TYPE_MAIN_VARIANT (ctype
);
11819 template_count
= num_template_headers_for_class (ctype
);
11821 if (ctype
== current_class_type
)
11825 permerror (input_location
, "member functions are implicitly "
11826 "friends of their class");
11830 permerror (declarator
->id_loc
,
11831 "extra qualification %<%T::%> on member %qs",
11834 else if (/* If the qualifying type is already complete, then we
11835 can skip the following checks. */
11836 !COMPLETE_TYPE_P (ctype
)
11837 && (/* If the function is being defined, then
11838 qualifying type must certainly be complete. */
11840 /* A friend declaration of "T::f" is OK, even if
11841 "T" is a template parameter. But, if this
11842 function is not a friend, the qualifying type
11843 must be a class. */
11844 || (!friendp
&& !CLASS_TYPE_P (ctype
))
11845 /* For a declaration, the type need not be
11846 complete, if either it is dependent (since there
11847 is no meaningful definition of complete in that
11848 case) or the qualifying class is currently being
11850 || !(dependent_type_p (ctype
)
11851 || currently_open_class (ctype
)))
11852 /* Check that the qualifying type is complete. */
11853 && !complete_type_or_else (ctype
, NULL_TREE
))
11854 return error_mark_node
;
11855 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
11857 if (current_class_type
11858 && (!friendp
|| funcdef_flag
|| initialized
))
11860 error (funcdef_flag
|| initialized
11861 ? G_("cannot define member function %<%T::%s%> "
11863 : G_("cannot declare member function %<%T::%s%> "
11865 ctype
, name
, current_class_type
);
11866 return error_mark_node
;
11869 else if (typedef_p
&& current_class_type
)
11871 error ("cannot declare member %<%T::%s%> within %qT",
11872 ctype
, name
, current_class_type
);
11873 return error_mark_node
;
11877 if (ctype
== NULL_TREE
&& decl_context
== FIELD
&& friendp
== 0)
11878 ctype
= current_class_type
;
11880 /* Now TYPE has the actual type. */
11882 if (returned_attrs
)
11885 *attrlist
= chainon (returned_attrs
, *attrlist
);
11887 attrlist
= &returned_attrs
;
11891 && declarator
->kind
== cdk_id
11892 && declarator
->std_attributes
11893 && attrlist
!= NULL
)
11895 /* [dcl.meaning]/1: The optional attribute-specifier-seq following
11896 a declarator-id appertains to the entity that is declared. */
11897 if (declarator
->std_attributes
!= error_mark_node
)
11898 *attrlist
= chainon (*attrlist
, declarator
->std_attributes
);
11900 /* We should have already diagnosed the issue (c++/78344). */
11901 gcc_assert (seen_error ());
11904 /* Handle parameter packs. */
11905 if (parameter_pack_p
)
11907 if (decl_context
== PARM
)
11908 /* Turn the type into a pack expansion.*/
11909 type
= make_pack_expansion (type
);
11911 error ("non-parameter %qs cannot be a parameter pack", name
);
11914 if ((decl_context
== FIELD
|| decl_context
== PARM
)
11915 && !processing_template_decl
11916 && variably_modified_type_p (type
, NULL_TREE
))
11918 if (decl_context
== FIELD
)
11919 error ("data member may not have variably modified type %qT", type
);
11921 error ("parameter may not have variably modified type %qT", type
);
11922 type
= error_mark_node
;
11925 if (explicitp
== 1 || (explicitp
&& friendp
))
11927 /* [dcl.fct.spec] (C++11) The explicit specifier shall be used only
11928 in the declaration of a constructor or conversion function within
11929 a class definition. */
11930 if (!current_class_type
)
11931 error_at (declspecs
->locations
[ds_explicit
],
11932 "%<explicit%> outside class declaration");
11934 error_at (declspecs
->locations
[ds_explicit
],
11935 "%<explicit%> in friend declaration");
11937 error_at (declspecs
->locations
[ds_explicit
],
11938 "only declarations of constructors and conversion operators "
11939 "can be %<explicit%>");
11943 if (storage_class
== sc_mutable
)
11945 location_t sloc
= declspecs
->locations
[ds_storage_class
];
11946 if (decl_context
!= FIELD
|| friendp
)
11948 error_at (sloc
, "non-member %qs cannot be declared %<mutable%>",
11950 storage_class
= sc_none
;
11952 else if (decl_context
== TYPENAME
|| typedef_p
)
11955 "non-object member %qs cannot be declared %<mutable%>",
11957 storage_class
= sc_none
;
11959 else if (TREE_CODE (type
) == FUNCTION_TYPE
11960 || TREE_CODE (type
) == METHOD_TYPE
)
11962 error_at (sloc
, "function %qs cannot be declared %<mutable%>",
11964 storage_class
= sc_none
;
11968 error_at (sloc
, "%<static%> %qs cannot be declared %<mutable%>",
11970 storage_class
= sc_none
;
11972 else if (type_quals
& TYPE_QUAL_CONST
)
11974 error_at (sloc
, "%<const%> %qs cannot be declared %<mutable%>",
11976 storage_class
= sc_none
;
11978 else if (TYPE_REF_P (type
))
11980 permerror (sloc
, "reference %qs cannot be declared %<mutable%>",
11982 storage_class
= sc_none
;
11986 location_t loc
= declarator
? declarator
->id_loc
: input_location
;
11988 /* If this is declaring a typedef name, return a TYPE_DECL. */
11989 if (typedef_p
&& decl_context
!= TYPENAME
)
11991 bool alias_p
= decl_spec_seq_has_spec_p (declspecs
, ds_alias
);
11994 /* This declaration:
11996 typedef void f(int) const;
11998 declares a function type which is not a member of any
11999 particular class, but which is cv-qualified; for
12000 example "f S::*" declares a pointer to a const-qualified
12001 member function of S. We record the cv-qualification in the
12003 if ((rqual
|| memfn_quals
) && TREE_CODE (type
) == FUNCTION_TYPE
)
12005 type
= apply_memfn_quals (type
, memfn_quals
, rqual
);
12007 /* We have now dealt with these qualifiers. */
12008 memfn_quals
= TYPE_UNQUALIFIED
;
12009 rqual
= REF_QUAL_NONE
;
12012 if (type_uses_auto (type
))
12015 error_at (declspecs
->locations
[ds_type_spec
],
12016 "%<auto%> not allowed in alias declaration");
12018 error_at (declspecs
->locations
[ds_type_spec
],
12019 "typedef declared %<auto%>");
12020 type
= error_mark_node
;
12024 error_at (location_of (reqs
), "requires-clause on typedef");
12026 if (id_declarator
&& declarator
->u
.id
.qualifying_scope
)
12028 error ("typedef name may not be a nested-name-specifier");
12029 type
= error_mark_node
;
12032 if (decl_context
== FIELD
)
12033 decl
= build_lang_decl_loc (loc
, TYPE_DECL
, unqualified_id
, type
);
12035 decl
= build_decl (loc
, TYPE_DECL
, unqualified_id
, type
);
12037 if (decl_context
!= FIELD
)
12039 if (!current_function_decl
)
12040 DECL_CONTEXT (decl
) = FROB_CONTEXT (current_namespace
);
12041 else if (DECL_MAYBE_IN_CHARGE_CDTOR_P (current_function_decl
))
12042 /* The TYPE_DECL is "abstract" because there will be
12043 clones of this constructor/destructor, and there will
12044 be copies of this TYPE_DECL generated in those
12045 clones. The decloning optimization (for space) may
12046 revert this subsequently if it determines that
12047 the clones should share a common implementation. */
12048 DECL_ABSTRACT_P (decl
) = true;
12050 else if (current_class_type
12051 && constructor_name_p (unqualified_id
, current_class_type
))
12052 permerror (input_location
, "ISO C++ forbids nested type %qD with same name "
12053 "as enclosing class",
12056 /* If the user declares "typedef struct {...} foo" then the
12057 struct will have an anonymous name. Fill that name in now.
12058 Nothing can refer to it, so nothing needs know about the name
12060 if (type
!= error_mark_node
12062 && TYPE_NAME (type
)
12063 && TREE_CODE (TYPE_NAME (type
)) == TYPE_DECL
12064 && TYPE_UNNAMED_P (type
)
12065 && declspecs
->type_definition_p
12066 && attributes_naming_typedef_ok (*attrlist
)
12067 && cp_type_quals (type
) == TYPE_UNQUALIFIED
)
12068 name_unnamed_type (type
, decl
);
12071 || (typedef_decl
&& C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
)))
12072 C_TYPEDEF_EXPLICITLY_SIGNED (decl
) = 1;
12074 bad_specifiers (decl
, BSP_TYPE
, virtualp
,
12075 memfn_quals
!= TYPE_UNQUALIFIED
,
12076 inlinep
, friendp
, raises
!= NULL_TREE
,
12077 declspecs
->locations
);
12080 /* Acknowledge that this was written:
12081 `using analias = atype;'. */
12082 TYPE_DECL_ALIAS_P (decl
) = 1;
12087 /* Detect the case of an array type of unspecified size
12088 which came, as such, direct from a typedef name.
12089 We must copy the type, so that the array's domain can be
12090 individually set by the object's initializer. */
12092 if (type
&& typedef_type
12093 && TREE_CODE (type
) == ARRAY_TYPE
&& !TYPE_DOMAIN (type
)
12094 && TYPE_MAIN_VARIANT (type
) == TYPE_MAIN_VARIANT (typedef_type
))
12095 type
= build_cplus_array_type (TREE_TYPE (type
), NULL_TREE
);
12097 /* Detect where we're using a typedef of function type to declare a
12098 function. PARMS will not be set, so we must create it now. */
12100 if (type
== typedef_type
&& TREE_CODE (type
) == FUNCTION_TYPE
)
12102 tree decls
= NULL_TREE
;
12105 for (args
= TYPE_ARG_TYPES (type
);
12106 args
&& args
!= void_list_node
;
12107 args
= TREE_CHAIN (args
))
12109 tree decl
= cp_build_parm_decl (NULL_TREE
, NULL_TREE
,
12110 TREE_VALUE (args
));
12112 DECL_CHAIN (decl
) = decls
;
12116 parms
= nreverse (decls
);
12118 if (decl_context
!= TYPENAME
)
12120 /* The qualifiers on the function type become the qualifiers on
12121 the non-static member function. */
12122 memfn_quals
|= type_memfn_quals (type
);
12123 rqual
= type_memfn_rqual (type
);
12124 type_quals
= TYPE_UNQUALIFIED
;
12128 /* If this is a type name (such as, in a cast or sizeof),
12129 compute the type and return it now. */
12131 if (decl_context
== TYPENAME
)
12133 /* Note that here we don't care about type_quals. */
12135 /* Special case: "friend class foo" looks like a TYPENAME context. */
12140 error ("%<inline%> specified for friend class declaration");
12146 /* Don't allow friend declaration without a class-key. */
12147 if (TREE_CODE (type
) == TEMPLATE_TYPE_PARM
)
12148 permerror (input_location
, "template parameters cannot be friends");
12149 else if (TREE_CODE (type
) == TYPENAME_TYPE
)
12150 permerror (input_location
, "friend declaration requires class-key, "
12151 "i.e. %<friend class %T::%D%>",
12152 TYPE_CONTEXT (type
), TYPENAME_TYPE_FULLNAME (type
));
12154 permerror (input_location
, "friend declaration requires class-key, "
12155 "i.e. %<friend %#T%>",
12159 /* Only try to do this stuff if we didn't already give up. */
12160 if (type
!= integer_type_node
)
12162 /* A friendly class? */
12163 if (current_class_type
)
12164 make_friend_class (current_class_type
, TYPE_MAIN_VARIANT (type
),
12165 /*complain=*/true);
12167 error ("trying to make class %qT a friend of global scope",
12170 type
= void_type_node
;
12173 else if (memfn_quals
|| rqual
)
12175 if (ctype
== NULL_TREE
12176 && TREE_CODE (type
) == METHOD_TYPE
)
12177 ctype
= TYPE_METHOD_BASETYPE (type
);
12180 type
= build_memfn_type (type
, ctype
, memfn_quals
, rqual
);
12181 /* Core issue #547: need to allow this in template type args.
12182 Allow it in general in C++11 for alias-declarations. */
12183 else if ((template_type_arg
|| cxx_dialect
>= cxx11
)
12184 && TREE_CODE (type
) == FUNCTION_TYPE
)
12185 type
= apply_memfn_quals (type
, memfn_quals
, rqual
);
12187 error ("invalid qualifiers on non-member function type");
12191 error_at (location_of (reqs
), "requires-clause on type-id");
12195 else if (unqualified_id
== NULL_TREE
&& decl_context
!= PARM
12196 && decl_context
!= CATCHPARM
12197 && TREE_CODE (type
) != UNION_TYPE
12199 && innermost_code
!= cdk_decomp
)
12201 error ("abstract declarator %qT used as declaration", type
);
12202 return error_mark_node
;
12205 if (!FUNC_OR_METHOD_TYPE_P (type
))
12207 /* Only functions may be declared using an operator-function-id. */
12208 if (dname
&& IDENTIFIER_ANY_OP_P (dname
))
12210 error ("declaration of %qD as non-function", dname
);
12211 return error_mark_node
;
12215 error_at (location_of (reqs
),
12216 "requires-clause on declaration of non-function type %qT",
12220 /* We don't check parameter types here because we can emit a better
12221 error message later. */
12222 if (decl_context
!= PARM
)
12224 type
= check_var_type (unqualified_id
, type
);
12225 if (type
== error_mark_node
)
12226 return error_mark_node
;
12229 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
12230 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
12232 if (decl_context
== PARM
|| decl_context
== CATCHPARM
)
12234 if (ctype
|| in_namespace
)
12235 error ("cannot use %<::%> in parameter declaration");
12237 if (type_uses_auto (type
)
12238 && !(cxx_dialect
>= cxx17
&& template_parm_flag
))
12240 if (cxx_dialect
>= cxx14
)
12241 error ("%<auto%> parameter not permitted in this context");
12243 error ("parameter declared %<auto%>");
12244 type
= error_mark_node
;
12247 /* A parameter declared as an array of T is really a pointer to T.
12248 One declared as a function is really a pointer to a function.
12249 One declared as a member is really a pointer to member. */
12251 if (TREE_CODE (type
) == ARRAY_TYPE
)
12253 /* Transfer const-ness of array into that of type pointed to. */
12254 type
= build_pointer_type (TREE_TYPE (type
));
12255 type_quals
= TYPE_UNQUALIFIED
;
12256 array_parameter_p
= true;
12258 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
12259 type
= build_pointer_type (type
);
12262 if (ctype
&& TREE_CODE (type
) == FUNCTION_TYPE
&& staticp
< 2
12263 && !(unqualified_id
12264 && identifier_p (unqualified_id
)
12265 && IDENTIFIER_NEWDEL_OP_P (unqualified_id
)))
12267 cp_cv_quals real_quals
= memfn_quals
;
12268 if (cxx_dialect
< cxx14
&& constexpr_p
12269 && sfk
!= sfk_constructor
&& sfk
!= sfk_destructor
)
12270 real_quals
|= TYPE_QUAL_CONST
;
12271 type
= build_memfn_type (type
, ctype
, real_quals
, rqual
);
12275 tree decl
= NULL_TREE
;
12277 if (decl_context
== PARM
)
12279 decl
= cp_build_parm_decl (NULL_TREE
, unqualified_id
, type
);
12280 DECL_ARRAY_PARAMETER_P (decl
) = array_parameter_p
;
12282 bad_specifiers (decl
, BSP_PARM
, virtualp
,
12283 memfn_quals
!= TYPE_UNQUALIFIED
,
12284 inlinep
, friendp
, raises
!= NULL_TREE
,
12285 declspecs
->locations
);
12287 else if (decl_context
== FIELD
)
12289 if (!staticp
&& !friendp
&& TREE_CODE (type
) != METHOD_TYPE
)
12290 if (tree auto_node
= type_uses_auto (type
))
12292 location_t tloc
= declspecs
->locations
[ds_type_spec
];
12293 if (CLASS_PLACEHOLDER_TEMPLATE (auto_node
))
12294 error_at (tloc
, "invalid use of template-name %qE without an "
12296 CLASS_PLACEHOLDER_TEMPLATE (auto_node
));
12298 error_at (tloc
, "non-static data member declared with "
12299 "placeholder %qT", auto_node
);
12300 type
= error_mark_node
;
12303 /* The C99 flexible array extension. */
12304 if (!staticp
&& TREE_CODE (type
) == ARRAY_TYPE
12305 && TYPE_DOMAIN (type
) == NULL_TREE
)
12308 && (TREE_CODE (ctype
) == UNION_TYPE
12309 || TREE_CODE (ctype
) == QUAL_UNION_TYPE
))
12311 error ("flexible array member in union");
12312 type
= error_mark_node
;
12316 /* Array is a flexible member. */
12317 if (in_system_header_at (input_location
))
12318 /* Do not warn on flexible array members in system
12319 headers because glibc uses them. */;
12320 else if (name
&& declarator
)
12321 pedwarn (declarator
->id_loc
, OPT_Wpedantic
,
12322 "ISO C++ forbids flexible array member %qs", name
);
12324 pedwarn (input_location
, OPT_Wpedantic
,
12325 "ISO C++ forbids flexible array members");
12327 /* Flexible array member has a null domain. */
12328 type
= build_cplus_array_type (TREE_TYPE (type
), NULL_TREE
);
12332 if (type
== error_mark_node
)
12334 /* Happens when declaring arrays of sizes which
12335 are error_mark_node, for example. */
12338 else if (in_namespace
&& !friendp
)
12340 /* Something like struct S { int N::j; }; */
12341 error ("invalid use of %<::%>");
12342 return error_mark_node
;
12344 else if (FUNC_OR_METHOD_TYPE_P (type
) && unqualified_id
)
12347 tree function_context
;
12351 /* This should never happen in pure C++ (the check
12352 could be an assert). It could happen in
12353 Objective-C++ if someone writes invalid code that
12354 uses a function declaration for an instance
12355 variable or property (instance variables and
12356 properties are parsed as FIELD_DECLs, but they are
12357 part of an Objective-C class, not a C++ class).
12358 That code is invalid and is caught by this
12362 error ("declaration of function %qD in invalid context",
12364 return error_mark_node
;
12367 /* ``A union may [ ... ] not [ have ] virtual functions.''
12369 if (virtualp
&& TREE_CODE (ctype
) == UNION_TYPE
)
12371 error_at (declspecs
->locations
[ds_virtual
],
12372 "function %qD declared %<virtual%> inside a union",
12374 return error_mark_node
;
12378 && identifier_p (unqualified_id
)
12379 && IDENTIFIER_NEWDEL_OP_P (unqualified_id
))
12381 error_at (declspecs
->locations
[ds_virtual
],
12382 "%qD cannot be declared %<virtual%>, since it "
12383 "is always static", unqualified_id
);
12388 /* Check that the name used for a destructor makes sense. */
12389 if (sfk
== sfk_destructor
)
12391 tree uqname
= id_declarator
->u
.id
.unqualified_name
;
12395 gcc_assert (friendp
);
12396 error ("expected qualified name in friend declaration "
12397 "for destructor %qD", uqname
);
12398 return error_mark_node
;
12401 if (!check_dtor_name (ctype
, TREE_OPERAND (uqname
, 0)))
12403 error ("declaration of %qD as member of %qT",
12405 return error_mark_node
;
12409 error_at (declspecs
->locations
[ds_concept
],
12410 "a destructor cannot be %<concept%>");
12411 return error_mark_node
;
12415 error_at (declspecs
->locations
[ds_constexpr
],
12416 "a destructor cannot be %<constexpr%>");
12417 return error_mark_node
;
12420 else if (sfk
== sfk_constructor
&& friendp
&& !ctype
)
12422 error ("expected qualified name in friend declaration "
12423 "for constructor %qD",
12424 id_declarator
->u
.id
.unqualified_name
);
12425 return error_mark_node
;
12427 if (sfk
== sfk_constructor
)
12430 error_at (declspecs
->locations
[ds_concept
],
12431 "a constructor cannot be %<concept%>");
12432 return error_mark_node
;
12436 error_at (declspecs
->locations
[ds_concept
],
12437 "a concept cannot be a member function");
12441 if (TREE_CODE (unqualified_id
) == TEMPLATE_ID_EXPR
)
12443 tree tmpl
= TREE_OPERAND (unqualified_id
, 0);
12444 if (variable_template_p (tmpl
))
12446 error ("specialization of variable template %qD "
12447 "declared as function", tmpl
);
12448 inform (DECL_SOURCE_LOCATION (tmpl
),
12449 "variable template declared here");
12450 return error_mark_node
;
12454 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
12455 function_context
= (ctype
!= NULL_TREE
) ?
12456 decl_function_context (TYPE_MAIN_DECL (ctype
)) : NULL_TREE
;
12457 publicp
= (! friendp
|| ! staticp
)
12458 && function_context
== NULL_TREE
;
12460 decl
= grokfndecl (ctype
, type
,
12461 TREE_CODE (unqualified_id
) != TEMPLATE_ID_EXPR
12462 ? unqualified_id
: dname
,
12467 virtualp
, flags
, memfn_quals
, rqual
, raises
,
12468 friendp
? -1 : 0, friendp
, publicp
,
12469 inlinep
| (2 * constexpr_p
) | (4 * concept_p
),
12470 initialized
== SD_DELETED
, sfk
,
12471 funcdef_flag
, late_return_type_p
,
12472 template_count
, in_namespace
,
12473 attrlist
, declarator
->id_loc
);
12474 decl
= set_virt_specifiers (decl
, virt_specifiers
);
12475 if (decl
== NULL_TREE
)
12476 return error_mark_node
;
12478 /* This clobbers the attrs stored in `decl' from `attrlist'. */
12479 /* The decl and setting of decl_attr is also turned off. */
12480 decl
= build_decl_attribute_variant (decl
, decl_attr
);
12483 /* [class.conv.ctor]
12485 A constructor declared without the function-specifier
12486 explicit that can be called with a single parameter
12487 specifies a conversion from the type of its first
12488 parameter to the type of its class. Such a constructor
12489 is called a converting constructor. */
12490 if (explicitp
== 2)
12491 DECL_NONCONVERTING_P (decl
) = 1;
12493 if (declspecs
->explicit_specifier
)
12494 store_explicit_specifier (decl
, declspecs
->explicit_specifier
);
12496 else if (!staticp
&& !dependent_type_p (type
)
12497 && !COMPLETE_TYPE_P (complete_type (type
))
12498 && (!complete_or_array_type_p (type
)
12499 || initialized
== 0))
12501 if (TREE_CODE (type
) != ARRAY_TYPE
12502 || !COMPLETE_TYPE_P (TREE_TYPE (type
)))
12504 if (unqualified_id
)
12506 error_at (declarator
->id_loc
,
12507 "field %qD has incomplete type %qT",
12508 unqualified_id
, type
);
12509 cxx_incomplete_type_inform (strip_array_types (type
));
12512 error ("name %qT has incomplete type", type
);
12514 type
= error_mark_node
;
12522 if (unqualified_id
&& declarator
)
12523 error_at (declarator
->id_loc
,
12524 "%qE is neither function nor member function; "
12525 "cannot be declared friend", unqualified_id
);
12527 error ("unnamed field is neither function nor member "
12528 "function; cannot be declared friend");
12529 return error_mark_node
;
12536 /* Friends are treated specially. */
12537 if (ctype
== current_class_type
)
12538 ; /* We already issued a permerror. */
12539 else if (decl
&& DECL_NAME (decl
))
12541 if (template_class_depth (current_class_type
) == 0)
12543 decl
= check_explicit_specialization
12544 (unqualified_id
, decl
, template_count
,
12545 2 * funcdef_flag
+ 4);
12546 if (decl
== error_mark_node
)
12547 return error_mark_node
;
12550 decl
= do_friend (ctype
, unqualified_id
, decl
,
12556 return error_mark_node
;
12559 /* Structure field. It may not be a function, except for C++. */
12561 if (decl
== NULL_TREE
)
12565 /* C++ allows static class members. All other work
12566 for this is done by grokfield. */
12567 decl
= build_lang_decl_loc (loc
, VAR_DECL
,
12568 unqualified_id
, type
);
12569 set_linkage_for_static_data_member (decl
);
12571 error_at (declspecs
->locations
[ds_concept
],
12572 "static data member %qE declared %<concept%>",
12574 else if (constexpr_p
&& !initialized
)
12576 error_at (DECL_SOURCE_LOCATION (decl
),
12577 "%<constexpr%> static data member %qD must "
12578 "have an initializer", decl
);
12579 constexpr_p
= false;
12583 mark_inline_variable (decl
, declspecs
->locations
[ds_inline
]);
12585 if (!DECL_VAR_DECLARED_INLINE_P (decl
)
12586 && !(cxx_dialect
>= cxx17
&& constexpr_p
))
12587 /* Even if there is an in-class initialization, DECL
12588 is considered undefined until an out-of-class
12589 definition is provided, unless this is an inline
12591 DECL_EXTERNAL (decl
) = 1;
12595 CP_DECL_THREAD_LOCAL_P (decl
) = true;
12596 if (!processing_template_decl
)
12597 set_decl_tls_model (decl
, decl_default_tls_model (decl
));
12598 if (declspecs
->gnu_thread_keyword_p
)
12599 SET_DECL_GNU_TLS_P (decl
);
12605 error_at (declspecs
->locations
[ds_concept
],
12606 "non-static data member %qE declared %<concept%>",
12608 else if (constexpr_p
)
12610 error_at (declspecs
->locations
[ds_constexpr
],
12611 "non-static data member %qE declared %<constexpr%>",
12613 constexpr_p
= false;
12615 decl
= build_decl (loc
, FIELD_DECL
, unqualified_id
, type
);
12616 DECL_NONADDRESSABLE_P (decl
) = bitfield
;
12617 if (bitfield
&& !unqualified_id
)
12619 TREE_NO_WARNING (decl
) = 1;
12620 DECL_PADDING_P (decl
) = 1;
12623 if (storage_class
== sc_mutable
)
12625 DECL_MUTABLE_P (decl
) = 1;
12626 storage_class
= sc_none
;
12631 /* An attempt is being made to initialize a non-static
12632 member. This is new in C++11. */
12633 maybe_warn_cpp0x (CPP0X_NSDMI
);
12635 /* If this has been parsed with static storage class, but
12636 errors forced staticp to be cleared, ensure NSDMI is
12638 if (declspecs
->storage_class
== sc_static
)
12639 DECL_INITIAL (decl
) = error_mark_node
;
12643 bad_specifiers (decl
, BSP_FIELD
, virtualp
,
12644 memfn_quals
!= TYPE_UNQUALIFIED
,
12645 staticp
? false : inlinep
, friendp
,
12646 raises
!= NULL_TREE
,
12647 declspecs
->locations
);
12650 else if (TREE_CODE (type
) == FUNCTION_TYPE
12651 || TREE_CODE (type
) == METHOD_TYPE
)
12653 tree original_name
;
12656 if (!unqualified_id
)
12657 return error_mark_node
;
12659 if (TREE_CODE (unqualified_id
) == TEMPLATE_ID_EXPR
)
12660 original_name
= dname
;
12662 original_name
= unqualified_id
;
12663 // FIXME:gcc_assert (original_name == dname);
12665 if (storage_class
== sc_auto
)
12666 error ("storage class %<auto%> invalid for function %qs", name
);
12667 else if (storage_class
== sc_register
)
12668 error ("storage class %<register%> invalid for function %qs", name
);
12671 if (declspecs
->gnu_thread_keyword_p
)
12672 error_at (declspecs
->locations
[ds_thread
],
12673 "storage class %<__thread%> invalid for function %qs",
12676 error_at (declspecs
->locations
[ds_thread
],
12677 "storage class %<thread_local%> invalid for "
12678 "function %qs", name
);
12681 if (virt_specifiers
)
12682 error ("virt-specifiers in %qs not allowed outside a class "
12683 "definition", name
);
12684 /* Function declaration not at top level.
12685 Storage classes other than `extern' are not allowed
12686 and `extern' makes no difference. */
12687 if (! toplevel_bindings_p ()
12688 && (storage_class
== sc_static
12689 || decl_spec_seq_has_spec_p (declspecs
, ds_inline
))
12692 if (storage_class
== sc_static
)
12693 pedwarn (declspecs
->locations
[ds_storage_class
], OPT_Wpedantic
,
12694 "%<static%> specifier invalid for function %qs "
12695 "declared out of global scope", name
);
12697 pedwarn (declspecs
->locations
[ds_inline
], OPT_Wpedantic
,
12698 "%<inline%> specifier invalid for function %qs "
12699 "declared out of global scope", name
);
12702 if (ctype
== NULL_TREE
)
12706 error ("virtual non-class function %qs", name
);
12709 else if (sfk
== sfk_constructor
12710 || sfk
== sfk_destructor
)
12712 error (funcdef_flag
12713 ? G_("%qs defined in a non-class scope")
12714 : G_("%qs declared in a non-class scope"), name
);
12719 /* Record whether the function is public. */
12720 publicp
= (ctype
!= NULL_TREE
12721 || storage_class
!= sc_static
);
12723 decl
= grokfndecl (ctype
, type
, original_name
, parms
, unqualified_id
,
12725 reqs
, virtualp
, flags
, memfn_quals
, rqual
, raises
,
12728 inlinep
| (2 * constexpr_p
) | (4 * concept_p
),
12729 initialized
== SD_DELETED
,
12732 late_return_type_p
,
12733 template_count
, in_namespace
, attrlist
,
12734 declarator
->id_loc
);
12735 if (decl
== NULL_TREE
)
12736 return error_mark_node
;
12738 if (explicitp
== 2)
12739 DECL_NONCONVERTING_P (decl
) = 1;
12742 int invalid_static
= 0;
12744 /* Don't allow a static member function in a class, and forbid
12745 declaring main to be static. */
12746 if (TREE_CODE (type
) == METHOD_TYPE
)
12748 permerror (input_location
, "cannot declare member function %qD to have "
12749 "static linkage", decl
);
12750 invalid_static
= 1;
12752 else if (current_function_decl
)
12754 /* 7.1.1: There can be no static function declarations within a
12756 error_at (declspecs
->locations
[ds_storage_class
],
12757 "cannot declare static function inside another function");
12758 invalid_static
= 1;
12761 if (invalid_static
)
12764 storage_class
= sc_none
;
12770 /* It's a variable. */
12772 /* An uninitialized decl with `extern' is a reference. */
12773 decl
= grokvardecl (type
, dname
, unqualified_id
,
12780 ctype
? ctype
: in_namespace
,
12782 if (decl
== NULL_TREE
)
12783 return error_mark_node
;
12785 bad_specifiers (decl
, BSP_VAR
, virtualp
,
12786 memfn_quals
!= TYPE_UNQUALIFIED
,
12787 inlinep
, friendp
, raises
!= NULL_TREE
,
12788 declspecs
->locations
);
12792 DECL_CONTEXT (decl
) = ctype
;
12795 permerror (declspecs
->locations
[ds_storage_class
],
12796 "%<static%> may not be used when defining "
12797 "(as opposed to declaring) a static data member");
12799 storage_class
= sc_none
;
12801 if (storage_class
== sc_register
&& TREE_STATIC (decl
))
12803 error ("static member %qD declared %<register%>", decl
);
12804 storage_class
= sc_none
;
12806 if (storage_class
== sc_extern
&& pedantic
)
12808 pedwarn (input_location
, OPT_Wpedantic
,
12809 "cannot explicitly declare member %q#D to have "
12810 "extern linkage", decl
);
12811 storage_class
= sc_none
;
12814 else if (constexpr_p
&& DECL_EXTERNAL (decl
))
12816 error_at (DECL_SOURCE_LOCATION (decl
),
12817 "declaration of %<constexpr%> variable %qD "
12818 "is not a definition", decl
);
12819 constexpr_p
= false;
12823 mark_inline_variable (decl
, declspecs
->locations
[ds_inline
]);
12824 if (innermost_code
== cdk_decomp
)
12826 gcc_assert (declarator
&& declarator
->kind
== cdk_decomp
);
12827 DECL_SOURCE_LOCATION (decl
) = declarator
->id_loc
;
12828 DECL_ARTIFICIAL (decl
) = 1;
12829 fit_decomposition_lang_decl (decl
, NULL_TREE
);
12833 if (VAR_P (decl
) && !initialized
)
12834 if (tree auto_node
= type_uses_auto (type
))
12835 if (!CLASS_PLACEHOLDER_TEMPLATE (auto_node
))
12837 location_t loc
= declspecs
->locations
[ds_type_spec
];
12838 error_at (loc
, "declaration of %q#D has no initializer", decl
);
12839 TREE_TYPE (decl
) = error_mark_node
;
12842 if (storage_class
== sc_extern
&& initialized
&& !funcdef_flag
)
12844 if (toplevel_bindings_p ())
12846 /* It's common practice (and completely valid) to have a const
12847 be initialized and declared extern. */
12848 if (!(type_quals
& TYPE_QUAL_CONST
))
12849 warning_at (DECL_SOURCE_LOCATION (decl
), 0,
12850 "%qs initialized and declared %<extern%>", name
);
12854 error_at (DECL_SOURCE_LOCATION (decl
),
12855 "%qs has both %<extern%> and initializer", name
);
12856 return error_mark_node
;
12860 /* Record `register' declaration for warnings on &
12861 and in case doing stupid register allocation. */
12863 if (storage_class
== sc_register
)
12865 DECL_REGISTER (decl
) = 1;
12866 /* Warn about register storage specifiers on PARM_DECLs. */
12867 if (TREE_CODE (decl
) == PARM_DECL
)
12869 if (cxx_dialect
>= cxx17
)
12870 pedwarn (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
12871 "ISO C++17 does not allow %<register%> storage "
12872 "class specifier");
12874 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
12875 "%<register%> storage class specifier used");
12878 else if (storage_class
== sc_extern
)
12879 DECL_THIS_EXTERN (decl
) = 1;
12880 else if (storage_class
== sc_static
)
12881 DECL_THIS_STATIC (decl
) = 1;
12883 /* Set constexpr flag on vars (functions got it in grokfndecl). */
12884 if (constexpr_p
&& VAR_P (decl
))
12885 DECL_DECLARED_CONSTEXPR_P (decl
) = true;
12887 /* Record constancy and volatility on the DECL itself . There's
12888 no need to do this when processing a template; we'll do this
12889 for the instantiated declaration based on the type of DECL. */
12890 if (!processing_template_decl
)
12891 cp_apply_type_quals_to_decl (type_quals
, decl
);
12897 /* Subroutine of start_function. Ensure that each of the parameter
12898 types (as listed in PARMS) is complete, as is required for a
12899 function definition. */
12902 require_complete_types_for_parms (tree parms
)
12904 for (; parms
; parms
= DECL_CHAIN (parms
))
12906 if (dependent_type_p (TREE_TYPE (parms
)))
12908 if (!VOID_TYPE_P (TREE_TYPE (parms
))
12909 && complete_type_or_else (TREE_TYPE (parms
), parms
))
12911 relayout_decl (parms
);
12912 DECL_ARG_TYPE (parms
) = type_passed_as (TREE_TYPE (parms
));
12914 maybe_warn_parm_abi (TREE_TYPE (parms
),
12915 DECL_SOURCE_LOCATION (parms
));
12918 /* grokparms or complete_type_or_else will have already issued
12920 TREE_TYPE (parms
) = error_mark_node
;
12924 /* Returns nonzero if T is a local variable. */
12927 local_variable_p (const_tree t
)
12930 /* A VAR_DECL with a context that is a _TYPE is a static data
12932 && !TYPE_P (CP_DECL_CONTEXT (t
))
12933 /* Any other non-local variable must be at namespace scope. */
12934 && !DECL_NAMESPACE_SCOPE_P (t
))
12935 || (TREE_CODE (t
) == PARM_DECL
))
12941 /* Like local_variable_p, but suitable for use as a tree-walking
12945 local_variable_p_walkfn (tree
*tp
, int *walk_subtrees
,
12948 if (local_variable_p (*tp
)
12949 && (!DECL_ARTIFICIAL (*tp
) || DECL_NAME (*tp
) == this_identifier
))
12951 else if (TYPE_P (*tp
))
12952 *walk_subtrees
= 0;
12957 /* Check that ARG, which is a default-argument expression for a
12958 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
12959 something goes wrong. DECL may also be a _TYPE node, rather than a
12960 DECL, if there is no DECL available. */
12963 check_default_argument (tree decl
, tree arg
, tsubst_flags_t complain
)
12968 if (TREE_CODE (arg
) == DEFAULT_ARG
)
12969 /* We get a DEFAULT_ARG when looking at an in-class declaration
12970 with a default argument. Ignore the argument for now; we'll
12971 deal with it after the class is complete. */
12980 decl_type
= TREE_TYPE (decl
);
12982 if (arg
== error_mark_node
12983 || decl
== error_mark_node
12984 || TREE_TYPE (arg
) == error_mark_node
12985 || decl_type
== error_mark_node
)
12986 /* Something already went wrong. There's no need to check
12988 return error_mark_node
;
12990 /* [dcl.fct.default]
12992 A default argument expression is implicitly converted to the
12994 ++cp_unevaluated_operand
;
12995 /* Avoid digest_init clobbering the initializer. */
12996 tree carg
= BRACE_ENCLOSED_INITIALIZER_P (arg
) ? unshare_expr (arg
): arg
;
12997 perform_implicit_conversion_flags (decl_type
, carg
, complain
,
12999 --cp_unevaluated_operand
;
13001 /* Avoid redundant -Wzero-as-null-pointer-constant warnings at
13003 if (TYPE_PTR_OR_PTRMEM_P (decl_type
)
13004 && null_ptr_cst_p (arg
))
13005 return nullptr_node
;
13007 /* [dcl.fct.default]
13009 Local variables shall not be used in default argument
13012 The keyword `this' shall not be used in a default argument of a
13013 member function. */
13014 var
= cp_walk_tree_without_duplicates (&arg
, local_variable_p_walkfn
, NULL
);
13017 if (complain
& tf_warning_or_error
)
13019 if (DECL_NAME (var
) == this_identifier
)
13020 permerror (input_location
, "default argument %qE uses %qD",
13023 error ("default argument %qE uses local variable %qD", arg
, var
);
13025 return error_mark_node
;
13032 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
13035 type_is_deprecated (tree type
)
13037 enum tree_code code
;
13038 if (TREE_DEPRECATED (type
))
13040 if (TYPE_NAME (type
))
13042 if (TREE_DEPRECATED (TYPE_NAME (type
)))
13048 /* Do warn about using typedefs to a deprecated class. */
13049 if (OVERLOAD_TYPE_P (type
) && type
!= TYPE_MAIN_VARIANT (type
))
13050 return type_is_deprecated (TYPE_MAIN_VARIANT (type
));
13052 code
= TREE_CODE (type
);
13054 if (code
== POINTER_TYPE
|| code
== REFERENCE_TYPE
13055 || code
== OFFSET_TYPE
|| code
== FUNCTION_TYPE
13056 || code
== METHOD_TYPE
|| code
== ARRAY_TYPE
)
13057 return type_is_deprecated (TREE_TYPE (type
));
13059 if (TYPE_PTRMEMFUNC_P (type
))
13060 return type_is_deprecated
13061 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type
))));
13066 /* Decode the list of parameter types for a function type.
13067 Given the list of things declared inside the parens,
13068 return a list of types.
13070 If this parameter does not end with an ellipsis, we append
13073 *PARMS is set to the chain of PARM_DECLs created. */
13076 grokparms (tree parmlist
, tree
*parms
)
13078 tree result
= NULL_TREE
;
13079 tree decls
= NULL_TREE
;
13083 for (parm
= parmlist
; parm
!= NULL_TREE
; parm
= TREE_CHAIN (parm
))
13085 tree type
= NULL_TREE
;
13086 tree init
= TREE_PURPOSE (parm
);
13087 tree decl
= TREE_VALUE (parm
);
13089 if (parm
== void_list_node
)
13092 if (! decl
|| TREE_TYPE (decl
) == error_mark_node
)
13095 type
= TREE_TYPE (decl
);
13096 if (VOID_TYPE_P (type
))
13098 if (same_type_p (type
, void_type_node
)
13100 && !DECL_NAME (decl
) && !result
13101 && TREE_CHAIN (parm
) == void_list_node
)
13102 /* DR 577: A parameter list consisting of a single
13103 unnamed parameter of non-dependent type 'void'. */
13105 else if (cv_qualified_p (type
))
13106 error_at (DECL_SOURCE_LOCATION (decl
),
13107 "invalid use of cv-qualified type %qT in "
13108 "parameter declaration", type
);
13110 error_at (DECL_SOURCE_LOCATION (decl
),
13111 "invalid use of type %<void%> in parameter "
13113 /* It's not a good idea to actually create parameters of
13114 type `void'; other parts of the compiler assume that a
13115 void type terminates the parameter list. */
13116 type
= error_mark_node
;
13117 TREE_TYPE (decl
) = error_mark_node
;
13120 if (type
!= error_mark_node
)
13122 if (deprecated_state
!= DEPRECATED_SUPPRESS
)
13124 tree deptype
= type_is_deprecated (type
);
13126 cp_warn_deprecated_use (deptype
);
13129 /* Top-level qualifiers on the parameters are
13130 ignored for function types. */
13131 type
= cp_build_qualified_type (type
, 0);
13132 if (TREE_CODE (type
) == METHOD_TYPE
)
13134 error ("parameter %qD invalidly declared method type", decl
);
13135 type
= build_pointer_type (type
);
13136 TREE_TYPE (decl
) = type
;
13138 else if (abstract_virtuals_error (decl
, type
))
13139 any_error
= 1; /* Seems like a good idea. */
13140 else if (cxx_dialect
< cxx17
&& INDIRECT_TYPE_P (type
))
13142 /* Before C++17 DR 393:
13143 [dcl.fct]/6, parameter types cannot contain pointers
13144 (references) to arrays of unknown bound. */
13145 tree t
= TREE_TYPE (type
);
13146 int ptr
= TYPE_PTR_P (type
);
13150 if (TYPE_PTR_P (t
))
13152 else if (TREE_CODE (t
) != ARRAY_TYPE
)
13154 else if (!TYPE_DOMAIN (t
))
13158 if (TREE_CODE (t
) == ARRAY_TYPE
)
13159 pedwarn (DECL_SOURCE_LOCATION (decl
), OPT_Wpedantic
,
13161 ? G_("parameter %qD includes pointer to array of "
13162 "unknown bound %qT")
13163 : G_("parameter %qD includes reference to array of "
13164 "unknown bound %qT"),
13170 else if (init
&& !processing_template_decl
)
13171 init
= check_default_argument (decl
, init
, tf_warning_or_error
);
13174 DECL_CHAIN (decl
) = decls
;
13176 result
= tree_cons (init
, type
, result
);
13178 decls
= nreverse (decls
);
13179 result
= nreverse (result
);
13181 result
= chainon (result
, void_list_node
);
13188 /* D is a constructor or overloaded `operator='.
13190 Let T be the class in which D is declared. Then, this function
13193 -1 if D's is an ill-formed constructor or copy assignment operator
13194 whose first parameter is of type `T'.
13195 0 if D is not a copy constructor or copy assignment
13197 1 if D is a copy constructor or copy assignment operator whose
13198 first parameter is a reference to non-const qualified T.
13199 2 if D is a copy constructor or copy assignment operator whose
13200 first parameter is a reference to const qualified T.
13202 This function can be used as a predicate. Positive values indicate
13203 a copy constructor and nonzero values indicate a copy assignment
13207 copy_fn_p (const_tree d
)
13213 gcc_assert (DECL_FUNCTION_MEMBER_P (d
));
13215 if (TREE_CODE (d
) == TEMPLATE_DECL
13216 || (DECL_TEMPLATE_INFO (d
)
13217 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d
))))
13218 /* Instantiations of template member functions are never copy
13219 functions. Note that member functions of templated classes are
13220 represented as template functions internally, and we must
13221 accept those as copy functions. */
13224 args
= FUNCTION_FIRST_USER_PARMTYPE (d
);
13228 arg_type
= TREE_VALUE (args
);
13229 if (arg_type
== error_mark_node
)
13232 if (TYPE_MAIN_VARIANT (arg_type
) == DECL_CONTEXT (d
))
13234 /* Pass by value copy assignment operator. */
13237 else if (TYPE_REF_P (arg_type
)
13238 && !TYPE_REF_IS_RVALUE (arg_type
)
13239 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type
)) == DECL_CONTEXT (d
))
13241 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type
)))
13247 args
= TREE_CHAIN (args
);
13249 if (args
&& args
!= void_list_node
&& !TREE_PURPOSE (args
))
13250 /* There are more non-optional args. */
13256 /* D is a constructor or overloaded `operator='.
13258 Let T be the class in which D is declared. Then, this function
13259 returns true when D is a move constructor or move assignment
13260 operator, false otherwise. */
13263 move_fn_p (const_tree d
)
13265 gcc_assert (DECL_FUNCTION_MEMBER_P (d
));
13267 if (cxx_dialect
== cxx98
)
13268 /* There are no move constructors if we are in C++98 mode. */
13271 if (TREE_CODE (d
) == TEMPLATE_DECL
13272 || (DECL_TEMPLATE_INFO (d
)
13273 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d
))))
13274 /* Instantiations of template member functions are never move
13275 functions. Note that member functions of templated classes are
13276 represented as template functions internally, and we must
13277 accept those as move functions. */
13280 return move_signature_fn_p (d
);
13283 /* D is a constructor or overloaded `operator='.
13285 Then, this function returns true when D has the same signature as a move
13286 constructor or move assignment operator (because either it is such a
13287 ctor/op= or it is a template specialization with the same signature),
13288 false otherwise. */
13291 move_signature_fn_p (const_tree d
)
13295 bool result
= false;
13297 args
= FUNCTION_FIRST_USER_PARMTYPE (d
);
13301 arg_type
= TREE_VALUE (args
);
13302 if (arg_type
== error_mark_node
)
13305 if (TYPE_REF_P (arg_type
)
13306 && TYPE_REF_IS_RVALUE (arg_type
)
13307 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type
)),
13311 args
= TREE_CHAIN (args
);
13313 if (args
&& args
!= void_list_node
&& !TREE_PURPOSE (args
))
13314 /* There are more non-optional args. */
13320 /* Remember any special properties of member function DECL. */
13323 grok_special_member_properties (tree decl
)
13327 if (TREE_CODE (decl
) == USING_DECL
13328 || !DECL_NONSTATIC_MEMBER_FUNCTION_P (decl
))
13331 class_type
= DECL_CONTEXT (decl
);
13332 if (IDENTIFIER_CTOR_P (DECL_NAME (decl
)))
13334 int ctor
= copy_fn_p (decl
);
13336 if (!DECL_ARTIFICIAL (decl
))
13337 TYPE_HAS_USER_CONSTRUCTOR (class_type
) = 1;
13343 A non-template constructor for class X is a copy
13344 constructor if its first parameter is of type X&, const
13345 X&, volatile X& or const volatile X&, and either there
13346 are no other parameters or else all other parameters have
13347 default arguments. */
13348 TYPE_HAS_COPY_CTOR (class_type
) = 1;
13349 if (user_provided_p (decl
))
13350 TYPE_HAS_COMPLEX_COPY_CTOR (class_type
) = 1;
13352 TYPE_HAS_CONST_COPY_CTOR (class_type
) = 1;
13354 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl
)))
13355 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type
) = 1;
13356 else if (move_fn_p (decl
) && user_provided_p (decl
))
13357 TYPE_HAS_COMPLEX_MOVE_CTOR (class_type
) = 1;
13358 else if (is_list_ctor (decl
))
13359 TYPE_HAS_LIST_CTOR (class_type
) = 1;
13361 if (DECL_DECLARED_CONSTEXPR_P (decl
)
13362 && !ctor
&& !move_fn_p (decl
))
13363 TYPE_HAS_CONSTEXPR_CTOR (class_type
) = 1;
13365 else if (DECL_NAME (decl
) == assign_op_identifier
)
13369 A non-template assignment operator for class X is a copy
13370 assignment operator if its parameter is of type X, X&, const
13371 X&, volatile X& or const volatile X&. */
13373 int assop
= copy_fn_p (decl
);
13377 TYPE_HAS_COPY_ASSIGN (class_type
) = 1;
13378 if (user_provided_p (decl
))
13379 TYPE_HAS_COMPLEX_COPY_ASSIGN (class_type
) = 1;
13381 TYPE_HAS_CONST_COPY_ASSIGN (class_type
) = 1;
13383 else if (move_fn_p (decl
) && user_provided_p (decl
))
13384 TYPE_HAS_COMPLEX_MOVE_ASSIGN (class_type
) = 1;
13386 else if (IDENTIFIER_CONV_OP_P (DECL_NAME (decl
)))
13387 TYPE_HAS_CONVERSION (class_type
) = true;
13389 /* Destructors are handled in check_methods. */
13392 /* Check a constructor DECL has the correct form. Complains
13393 if the class has a constructor of the form X(X). */
13396 grok_ctor_properties (const_tree ctype
, const_tree decl
)
13398 int ctor_parm
= copy_fn_p (decl
);
13404 A declaration of a constructor for a class X is ill-formed if
13405 its first parameter is of type (optionally cv-qualified) X
13406 and either there are no other parameters or else all other
13407 parameters have default arguments.
13409 We *don't* complain about member template instantiations that
13410 have this form, though; they can occur as we try to decide
13411 what constructor to use during overload resolution. Since
13412 overload resolution will never prefer such a constructor to
13413 the non-template copy constructor (which is either explicitly
13414 or implicitly defined), there's no need to worry about their
13415 existence. Theoretically, they should never even be
13416 instantiated, but that's hard to forestall. */
13417 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
13425 /* DECL is a declaration for an overloaded or conversion operator. If
13426 COMPLAIN is true, errors are issued for invalid declarations. */
13429 grok_op_properties (tree decl
, bool complain
)
13431 tree argtypes
= TYPE_ARG_TYPES (TREE_TYPE (decl
));
13432 bool methodp
= TREE_CODE (TREE_TYPE (decl
)) == METHOD_TYPE
;
13433 tree name
= DECL_NAME (decl
);
13434 location_t loc
= DECL_SOURCE_LOCATION (decl
);
13436 tree class_type
= DECL_CONTEXT (decl
);
13437 if (class_type
&& !CLASS_TYPE_P (class_type
))
13438 class_type
= NULL_TREE
;
13440 tree_code operator_code
;
13442 if (IDENTIFIER_CONV_OP_P (name
))
13444 /* Conversion operators are TYPE_EXPR for the purposes of this
13446 operator_code
= TYPE_EXPR
;
13447 op_flags
= OVL_OP_FLAG_UNARY
;
13451 const ovl_op_info_t
*ovl_op
= IDENTIFIER_OVL_OP_INFO (name
);
13453 operator_code
= ovl_op
->tree_code
;
13454 op_flags
= ovl_op
->flags
;
13455 gcc_checking_assert (operator_code
!= ERROR_MARK
);
13456 DECL_OVERLOADED_OPERATOR_CODE_RAW (decl
) = ovl_op
->ovl_op_code
;
13459 if (op_flags
& OVL_OP_FLAG_ALLOC
)
13461 /* operator new and operator delete are quite special. */
13465 case OVL_OP_FLAG_ALLOC
:
13466 TYPE_HAS_NEW_OPERATOR (class_type
) = 1;
13469 case OVL_OP_FLAG_ALLOC
| OVL_OP_FLAG_DELETE
:
13470 TYPE_GETS_DELETE (class_type
) |= 1;
13473 case OVL_OP_FLAG_ALLOC
| OVL_OP_FLAG_VEC
:
13474 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type
) = 1;
13477 case OVL_OP_FLAG_ALLOC
| OVL_OP_FLAG_DELETE
| OVL_OP_FLAG_VEC
:
13478 TYPE_GETS_DELETE (class_type
) |= 2;
13482 gcc_unreachable ();
13485 /* [basic.std.dynamic.allocation]/1:
13487 A program is ill-formed if an allocation function is declared
13488 in a namespace scope other than global scope or declared
13489 static in global scope.
13491 The same also holds true for deallocation functions. */
13492 if (DECL_NAMESPACE_SCOPE_P (decl
))
13494 if (CP_DECL_CONTEXT (decl
) != global_namespace
)
13496 error_at (loc
, "%qD may not be declared within a namespace",
13501 if (!TREE_PUBLIC (decl
))
13503 error_at (loc
, "%qD may not be declared as static", decl
);
13508 if (op_flags
& OVL_OP_FLAG_DELETE
)
13509 coerce_delete_type (decl
, loc
);
13512 DECL_IS_OPERATOR_NEW (decl
) = 1;
13513 TREE_TYPE (decl
) = coerce_new_type (TREE_TYPE (decl
), loc
);
13519 /* An operator function must either be a non-static member function
13520 or have at least one parameter of a class, a reference to a class,
13521 an enumeration, or a reference to an enumeration. 13.4.0.6 */
13522 if (! methodp
|| DECL_STATIC_FUNCTION_P (decl
))
13524 if (operator_code
== TYPE_EXPR
13525 || operator_code
== CALL_EXPR
13526 || operator_code
== COMPONENT_REF
13527 || operator_code
== ARRAY_REF
13528 || operator_code
== NOP_EXPR
)
13530 error_at (loc
, "%qD must be a nonstatic member function", decl
);
13534 if (DECL_STATIC_FUNCTION_P (decl
))
13536 error_at (loc
, "%qD must be either a non-static member "
13537 "function or a non-member function", decl
);
13541 for (tree arg
= argtypes
; ; arg
= TREE_CHAIN (arg
))
13543 if (!arg
|| arg
== void_list_node
)
13546 error_at(loc
, "%qD must have an argument of class or "
13547 "enumerated type", decl
);
13551 tree type
= non_reference (TREE_VALUE (arg
));
13552 if (type
== error_mark_node
)
13555 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
13556 because these checks are performed even on template
13558 if (MAYBE_CLASS_TYPE_P (type
)
13559 || TREE_CODE (type
) == ENUMERAL_TYPE
)
13564 if (operator_code
== CALL_EXPR
)
13565 /* There are no further restrictions on the arguments to an overloaded
13569 if (operator_code
== COND_EXPR
)
13572 error_at (loc
, "ISO C++ prohibits overloading operator ?:");
13576 /* Count the number of arguments and check for ellipsis. */
13578 for (tree arg
= argtypes
; arg
!= void_list_node
; arg
= TREE_CHAIN (arg
))
13583 error_at (loc
, "%qD must not have variable number of arguments",
13590 /* Verify correct number of arguments. */
13593 case OVL_OP_FLAG_AMBIARY
:
13596 /* We have a unary instance of an ambi-ary op. Remap to the
13598 unsigned alt
= ovl_op_alternate
[ovl_op_mapping
[operator_code
]];
13599 const ovl_op_info_t
*ovl_op
= &ovl_op_info
[false][alt
];
13600 gcc_checking_assert (ovl_op
->flags
== OVL_OP_FLAG_UNARY
);
13601 operator_code
= ovl_op
->tree_code
;
13602 DECL_OVERLOADED_OPERATOR_CODE_RAW (decl
) = ovl_op
->ovl_op_code
;
13604 else if (arity
!= 2)
13606 /* This was an ambiguous operator but is invalid. */
13609 ? G_("%qD must have either zero or one argument")
13610 : G_("%qD must have either one or two arguments"), decl
);
13613 else if ((operator_code
== POSTINCREMENT_EXPR
13614 || operator_code
== POSTDECREMENT_EXPR
)
13615 && ! processing_template_decl
13616 /* x++ and x--'s second argument must be an int. */
13617 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes
)),
13618 integer_type_node
))
13622 ? G_("postfix %qD must have %<int%> as its argument")
13623 : G_("postfix %qD must have %<int%> as its second argument"),
13629 case OVL_OP_FLAG_UNARY
:
13634 ? G_("%qD must have no arguments")
13635 : G_("%qD must have exactly one argument"), decl
);
13640 case OVL_OP_FLAG_BINARY
:
13645 ? G_("%qD must have exactly one argument")
13646 : G_("%qD must have exactly two arguments"), decl
);
13652 gcc_unreachable ();
13655 /* There can be no default arguments. */
13656 for (tree arg
= argtypes
; arg
!= void_list_node
; arg
= TREE_CHAIN (arg
))
13657 if (TREE_PURPOSE (arg
))
13659 TREE_PURPOSE (arg
) = NULL_TREE
;
13660 error_at (loc
, "%qD cannot have default arguments", decl
);
13664 /* At this point the declaration is well-formed. It may not be
13665 sensible though. */
13667 /* Check member function warnings only on the in-class declaration.
13668 There's no point warning on an out-of-class definition. */
13669 if (class_type
&& class_type
!= current_class_type
)
13672 /* Warn about conversion operators that will never be used. */
13673 if (IDENTIFIER_CONV_OP_P (name
)
13674 && ! DECL_TEMPLATE_INFO (decl
)
13675 && warn_class_conversion
)
13677 tree t
= TREE_TYPE (name
);
13678 int ref
= TYPE_REF_P (t
);
13681 t
= TYPE_MAIN_VARIANT (TREE_TYPE (t
));
13683 if (VOID_TYPE_P (t
))
13684 warning_at (loc
, OPT_Wclass_conversion
, "converting %qT to %<void%> "
13685 "will never use a type conversion operator", class_type
);
13686 else if (class_type
)
13688 if (same_type_ignoring_top_level_qualifiers_p (t
, class_type
))
13689 warning_at (loc
, OPT_Wclass_conversion
,
13691 ? G_("converting %qT to a reference to the same type "
13692 "will never use a type conversion operator")
13693 : G_("converting %qT to the same type "
13694 "will never use a type conversion operator"),
13696 /* Don't force t to be complete here. */
13697 else if (MAYBE_CLASS_TYPE_P (t
)
13698 && COMPLETE_TYPE_P (t
)
13699 && DERIVED_FROM_P (t
, class_type
))
13700 warning_at (loc
, OPT_Wclass_conversion
,
13702 ? G_("converting %qT to a reference to a base class "
13703 "%qT will never use a type conversion operator")
13704 : G_("converting %qT to a base class %qT "
13705 "will never use a type conversion operator"),
13713 /* Effective C++ rules below. */
13715 /* More Effective C++ rule 7. */
13716 if (operator_code
== TRUTH_ANDIF_EXPR
13717 || operator_code
== TRUTH_ORIF_EXPR
13718 || operator_code
== COMPOUND_EXPR
)
13719 warning_at (loc
, OPT_Weffc__
,
13720 "user-defined %qD always evaluates both arguments", decl
);
13722 /* More Effective C++ rule 6. */
13723 if (operator_code
== POSTINCREMENT_EXPR
13724 || operator_code
== POSTDECREMENT_EXPR
13725 || operator_code
== PREINCREMENT_EXPR
13726 || operator_code
== PREDECREMENT_EXPR
)
13728 tree arg
= TREE_VALUE (argtypes
);
13729 tree ret
= TREE_TYPE (TREE_TYPE (decl
));
13730 if (methodp
|| TYPE_REF_P (arg
))
13731 arg
= TREE_TYPE (arg
);
13732 arg
= TYPE_MAIN_VARIANT (arg
);
13734 if (operator_code
== PREINCREMENT_EXPR
13735 || operator_code
== PREDECREMENT_EXPR
)
13737 if (!TYPE_REF_P (ret
)
13738 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret
)), arg
))
13739 warning_at (loc
, OPT_Weffc__
, "prefix %qD should return %qT", decl
,
13740 build_reference_type (arg
));
13744 if (!same_type_p (TYPE_MAIN_VARIANT (ret
), arg
))
13745 warning_at (loc
, OPT_Weffc__
,
13746 "postfix %qD should return %qT", decl
, arg
);
13750 /* Effective C++ rule 23. */
13751 if (!DECL_ASSIGNMENT_OPERATOR_P (decl
)
13752 && (operator_code
== PLUS_EXPR
13753 || operator_code
== MINUS_EXPR
13754 || operator_code
== TRUNC_DIV_EXPR
13755 || operator_code
== MULT_EXPR
13756 || operator_code
== TRUNC_MOD_EXPR
)
13757 && TYPE_REF_P (TREE_TYPE (TREE_TYPE (decl
))))
13758 warning_at (loc
, OPT_Weffc__
, "%qD should return by value", decl
);
13763 /* Return a string giving the keyword associate with CODE. */
13765 static const char *
13766 tag_name (enum tag_types code
)
13778 case typename_type
:
13781 gcc_unreachable ();
13785 /* Name lookup in an elaborated-type-specifier (after the keyword
13786 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
13787 elaborated-type-specifier is invalid, issue a diagnostic and return
13788 error_mark_node; otherwise, return the *_TYPE to which it referred.
13789 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
13792 check_elaborated_type_specifier (enum tag_types tag_code
,
13794 bool allow_template_p
)
13800 struct S { struct S *p; };
13802 name lookup will find the TYPE_DECL for the implicit "S::S"
13803 typedef. Adjust for that here. */
13804 if (DECL_SELF_REFERENCE_P (decl
))
13805 decl
= TYPE_NAME (TREE_TYPE (decl
));
13807 type
= TREE_TYPE (decl
);
13809 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
13810 is false for this case as well. */
13811 if (TREE_CODE (type
) == TEMPLATE_TYPE_PARM
)
13813 error ("using template type parameter %qT after %qs",
13814 type
, tag_name (tag_code
));
13815 return error_mark_node
;
13817 /* Accept template template parameters. */
13818 else if (allow_template_p
13819 && (TREE_CODE (type
) == BOUND_TEMPLATE_TEMPLATE_PARM
13820 || TREE_CODE (type
) == TEMPLATE_TEMPLATE_PARM
))
13824 If the identifier resolves to a typedef-name or the
13825 simple-template-id resolves to an alias template
13826 specialization, the elaborated-type-specifier is ill-formed.
13828 In other words, the only legitimate declaration to use in the
13829 elaborated type specifier is the implicit typedef created when
13830 the type is declared. */
13831 else if (!DECL_IMPLICIT_TYPEDEF_P (decl
)
13832 && !DECL_SELF_REFERENCE_P (decl
)
13833 && tag_code
!= typename_type
)
13835 if (alias_template_specialization_p (type
))
13836 error ("using alias template specialization %qT after %qs",
13837 type
, tag_name (tag_code
));
13839 error ("using typedef-name %qD after %qs", decl
, tag_name (tag_code
));
13840 inform (DECL_SOURCE_LOCATION (decl
),
13841 "%qD has a previous declaration here", decl
);
13842 return error_mark_node
;
13844 else if (TREE_CODE (type
) != RECORD_TYPE
13845 && TREE_CODE (type
) != UNION_TYPE
13846 && tag_code
!= enum_type
13847 && tag_code
!= typename_type
)
13849 error ("%qT referred to as %qs", type
, tag_name (tag_code
));
13850 inform (location_of (type
), "%qT has a previous declaration here", type
);
13851 return error_mark_node
;
13853 else if (TREE_CODE (type
) != ENUMERAL_TYPE
13854 && tag_code
== enum_type
)
13856 error ("%qT referred to as enum", type
);
13857 inform (location_of (type
), "%qT has a previous declaration here", type
);
13858 return error_mark_node
;
13860 else if (!allow_template_p
13861 && TREE_CODE (type
) == RECORD_TYPE
13862 && CLASSTYPE_IS_TEMPLATE (type
))
13864 /* If a class template appears as elaborated type specifier
13865 without a template header such as:
13867 template <class T> class C {};
13868 void f(class C); // No template header here
13870 then the required template argument is missing. */
13871 error ("template argument required for %<%s %T%>",
13872 tag_name (tag_code
),
13873 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type
)));
13874 return error_mark_node
;
13880 /* Lookup NAME in elaborate type specifier in scope according to
13881 SCOPE and issue diagnostics if necessary.
13882 Return *_TYPE node upon success, NULL_TREE when the NAME is not
13883 found, and ERROR_MARK_NODE for type error. */
13886 lookup_and_check_tag (enum tag_types tag_code
, tree name
,
13887 tag_scope scope
, bool template_header_p
)
13891 if (scope
== ts_global
)
13893 /* First try ordinary name lookup, ignoring hidden class name
13894 injected via friend declaration. */
13895 decl
= lookup_name_prefer_type (name
, 2);
13896 decl
= strip_using_decl (decl
);
13897 /* If that fails, the name will be placed in the smallest
13898 non-class, non-function-prototype scope according to 3.3.1/5.
13899 We may already have a hidden name declared as friend in this
13900 scope. So lookup again but not ignoring hidden names.
13901 If we find one, that name will be made visible rather than
13902 creating a new tag. */
13904 decl
= lookup_type_scope (name
, ts_within_enclosing_non_class
);
13907 decl
= lookup_type_scope (name
, scope
);
13910 && (DECL_CLASS_TEMPLATE_P (decl
)
13911 /* If scope is ts_current we're defining a class, so ignore a
13912 template template parameter. */
13913 || (scope
!= ts_current
13914 && DECL_TEMPLATE_TEMPLATE_PARM_P (decl
))))
13915 decl
= DECL_TEMPLATE_RESULT (decl
);
13917 if (decl
&& TREE_CODE (decl
) == TYPE_DECL
)
13919 /* Look for invalid nested type:
13923 if (scope
== ts_current
&& DECL_SELF_REFERENCE_P (decl
))
13925 error ("%qD has the same name as the class in which it is "
13928 return error_mark_node
;
13931 /* Two cases we need to consider when deciding if a class
13932 template is allowed as an elaborated type specifier:
13933 1. It is a self reference to its own class.
13934 2. It comes with a template header.
13938 template <class T> class C {
13939 class C *c1; // DECL_SELF_REFERENCE_P is true
13942 template <class U> class C; // template_header_p is true
13943 template <class T> class C<T>::D {
13944 class C *c2; // DECL_SELF_REFERENCE_P is true
13947 t
= check_elaborated_type_specifier (tag_code
,
13950 | DECL_SELF_REFERENCE_P (decl
));
13951 if (template_header_p
&& t
&& CLASS_TYPE_P (t
)
13952 && (!CLASSTYPE_TEMPLATE_INFO (t
)
13953 || (!PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t
)))))
13955 error ("%qT is not a template", t
);
13956 inform (location_of (t
), "previous declaration here");
13957 if (TYPE_CLASS_SCOPE_P (t
)
13958 && CLASSTYPE_TEMPLATE_INFO (TYPE_CONTEXT (t
)))
13959 inform (input_location
,
13960 "perhaps you want to explicitly add %<%T::%>",
13962 t
= error_mark_node
;
13967 else if (decl
&& TREE_CODE (decl
) == TREE_LIST
)
13969 error ("reference to %qD is ambiguous", name
);
13970 print_candidates (decl
);
13971 return error_mark_node
;
13977 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
13978 Define the tag as a forward-reference if it is not defined.
13980 If a declaration is given, process it here, and report an error if
13981 multiple declarations are not identical.
13983 SCOPE is TS_CURRENT when this is also a definition. Only look in
13984 the current frame for the name (since C++ allows new names in any
13985 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
13986 declaration. Only look beginning from the current scope outward up
13987 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
13989 TEMPLATE_HEADER_P is true when this declaration is preceded by
13990 a set of template parameters. */
13993 xref_tag_1 (enum tag_types tag_code
, tree name
,
13994 tag_scope scope
, bool template_header_p
)
13996 enum tree_code code
;
13997 tree context
= NULL_TREE
;
13999 gcc_assert (identifier_p (name
));
14005 code
= RECORD_TYPE
;
14011 code
= ENUMERAL_TYPE
;
14014 gcc_unreachable ();
14017 /* In case of anonymous name, xref_tag is only called to
14018 make type node and push name. Name lookup is not required. */
14019 tree t
= NULL_TREE
;
14020 if (scope
!= ts_lambda
&& !anon_aggrname_p (name
))
14021 t
= lookup_and_check_tag (tag_code
, name
, scope
, template_header_p
);
14023 if (t
== error_mark_node
)
14024 return error_mark_node
;
14026 if (scope
!= ts_current
&& t
&& current_class_type
14027 && template_class_depth (current_class_type
)
14028 && template_header_p
)
14030 if (TREE_CODE (t
) == TEMPLATE_TEMPLATE_PARM
)
14033 /* Since SCOPE is not TS_CURRENT, we are not looking at a
14034 definition of this tag. Since, in addition, we are currently
14035 processing a (member) template declaration of a template
14036 class, we must be very careful; consider:
14038 template <class X> struct S1
14040 template <class U> struct S2
14042 template <class V> friend struct S1;
14045 Here, the S2::S1 declaration should not be confused with the
14046 outer declaration. In particular, the inner version should
14047 have a template parameter of level 2, not level 1.
14049 On the other hand, when presented with:
14051 template <class T> struct S1
14053 template <class U> struct S2 {};
14054 template <class U> friend struct S2;
14057 the friend must find S1::S2 eventually. We accomplish this
14058 by making sure that the new type we create to represent this
14059 declaration has the right TYPE_CONTEXT. */
14060 context
= TYPE_CONTEXT (t
);
14066 /* If no such tag is yet defined, create a forward-reference node
14067 and record it as the "definition".
14068 When a real declaration of this type is found,
14069 the forward-reference will be altered into a real type. */
14070 if (code
== ENUMERAL_TYPE
)
14072 error ("use of enum %q#D without previous declaration", name
);
14073 return error_mark_node
;
14077 t
= make_class_type (code
);
14078 TYPE_CONTEXT (t
) = context
;
14079 if (scope
== ts_lambda
)
14081 /* Mark it as a lambda type. */
14082 CLASSTYPE_LAMBDA_EXPR (t
) = error_mark_node
;
14083 /* And push it into current scope. */
14084 scope
= ts_current
;
14086 t
= pushtag (name
, t
, scope
);
14091 if (template_header_p
&& MAYBE_CLASS_TYPE_P (t
))
14093 /* Check that we aren't trying to overload a class with different
14095 tree constr
= NULL_TREE
;
14096 if (current_template_parms
)
14098 tree reqs
= TEMPLATE_PARMS_CONSTRAINTS (current_template_parms
);
14099 constr
= build_constraints (reqs
, NULL_TREE
);
14101 if (!redeclare_class_template (t
, current_template_parms
, constr
))
14102 return error_mark_node
;
14104 else if (!processing_template_decl
14105 && CLASS_TYPE_P (t
)
14106 && CLASSTYPE_IS_TEMPLATE (t
))
14108 error ("redeclaration of %qT as a non-template", t
);
14109 inform (location_of (t
), "previous declaration %qD", t
);
14110 return error_mark_node
;
14113 if (scope
!= ts_within_enclosing_non_class
&& TYPE_HIDDEN_P (t
))
14115 /* This is no longer an invisible friend. Make it
14117 tree decl
= TYPE_NAME (t
);
14119 DECL_ANTICIPATED (decl
) = false;
14120 DECL_FRIEND_P (decl
) = false;
14122 if (TYPE_TEMPLATE_INFO (t
))
14124 tree tmpl
= TYPE_TI_TEMPLATE (t
);
14125 DECL_ANTICIPATED (tmpl
) = false;
14126 DECL_FRIEND_P (tmpl
) = false;
14134 /* Wrapper for xref_tag_1. */
14137 xref_tag (enum tag_types tag_code
, tree name
,
14138 tag_scope scope
, bool template_header_p
)
14142 subtime
= timevar_cond_start (TV_NAME_LOOKUP
);
14143 ret
= xref_tag_1 (tag_code
, name
, scope
, template_header_p
);
14144 timevar_cond_stop (TV_NAME_LOOKUP
, subtime
);
14150 xref_tag_from_type (tree old
, tree id
, tag_scope scope
)
14152 enum tag_types tag_kind
;
14154 if (TREE_CODE (old
) == RECORD_TYPE
)
14155 tag_kind
= (CLASSTYPE_DECLARED_CLASS (old
) ? class_type
: record_type
);
14157 tag_kind
= union_type
;
14159 if (id
== NULL_TREE
)
14160 id
= TYPE_IDENTIFIER (old
);
14162 return xref_tag (tag_kind
, id
, scope
, false);
14165 /* Create the binfo hierarchy for REF with (possibly NULL) base list
14166 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
14167 access_* node, and the TREE_VALUE is the type of the base-class.
14168 Non-NULL TREE_TYPE indicates virtual inheritance. */
14171 xref_basetypes (tree ref
, tree base_list
)
14174 tree binfo
, base_binfo
;
14175 unsigned max_vbases
= 0; /* Maximum direct & indirect virtual bases. */
14176 unsigned max_bases
= 0; /* Maximum direct bases. */
14177 unsigned max_dvbases
= 0; /* Maximum direct virtual bases. */
14179 tree default_access
;
14180 tree igo_prev
; /* Track Inheritance Graph Order. */
14182 if (ref
== error_mark_node
)
14185 /* The base of a derived class is private by default, all others are
14187 default_access
= (TREE_CODE (ref
) == RECORD_TYPE
14188 && CLASSTYPE_DECLARED_CLASS (ref
)
14189 ? access_private_node
: access_public_node
);
14191 /* First, make sure that any templates in base-classes are
14192 instantiated. This ensures that if we call ourselves recursively
14193 we do not get confused about which classes are marked and which
14195 basep
= &base_list
;
14198 tree basetype
= TREE_VALUE (*basep
);
14200 /* The dependent_type_p call below should really be dependent_scope_p
14201 so that we give a hard error about using an incomplete type as a
14202 base, but we allow it with a pedwarn for backward
14204 if (processing_template_decl
14205 && CLASS_TYPE_P (basetype
) && TYPE_BEING_DEFINED (basetype
))
14206 cxx_incomplete_type_diagnostic (NULL_TREE
, basetype
, DK_PEDWARN
);
14207 if (!dependent_type_p (basetype
)
14208 && !complete_type_or_else (basetype
, NULL
))
14209 /* An incomplete type. Remove it from the list. */
14210 *basep
= TREE_CHAIN (*basep
);
14214 if (TREE_TYPE (*basep
))
14216 if (CLASS_TYPE_P (basetype
))
14217 max_vbases
+= vec_safe_length (CLASSTYPE_VBASECLASSES (basetype
));
14218 basep
= &TREE_CHAIN (*basep
);
14221 max_vbases
+= max_dvbases
;
14223 TYPE_MARKED_P (ref
) = 1;
14225 /* The binfo slot should be empty, unless this is an (ill-formed)
14227 gcc_assert (!TYPE_BINFO (ref
) || TYPE_SIZE (ref
));
14229 gcc_assert (TYPE_MAIN_VARIANT (ref
) == ref
);
14231 binfo
= make_tree_binfo (max_bases
);
14233 TYPE_BINFO (ref
) = binfo
;
14234 BINFO_OFFSET (binfo
) = size_zero_node
;
14235 BINFO_TYPE (binfo
) = ref
;
14237 /* Apply base-class info set up to the variants of this type. */
14238 fixup_type_variants (ref
);
14242 vec_alloc (BINFO_BASE_ACCESSES (binfo
), max_bases
);
14243 /* A C++98 POD cannot have base classes. */
14244 CLASSTYPE_NON_LAYOUT_POD_P (ref
) = true;
14246 if (TREE_CODE (ref
) == UNION_TYPE
)
14248 error ("derived union %qT invalid", ref
);
14254 warning (OPT_Wmultiple_inheritance
,
14255 "%qT defined with multiple direct bases", ref
);
14259 /* An aggregate can't have virtual base classes. */
14260 CLASSTYPE_NON_AGGREGATE (ref
) = true;
14262 vec_alloc (CLASSTYPE_VBASECLASSES (ref
), max_vbases
);
14265 warning (OPT_Wvirtual_inheritance
,
14266 "%qT defined with direct virtual base", ref
);
14269 for (igo_prev
= binfo
; base_list
; base_list
= TREE_CHAIN (base_list
))
14271 tree access
= TREE_PURPOSE (base_list
);
14272 int via_virtual
= TREE_TYPE (base_list
) != NULL_TREE
;
14273 tree basetype
= TREE_VALUE (base_list
);
14275 if (access
== access_default_node
)
14276 access
= default_access
;
14278 /* Before C++17, an aggregate cannot have base classes. In C++17, an
14279 aggregate can't have virtual, private, or protected base classes. */
14280 if (cxx_dialect
< cxx17
14281 || access
!= access_public_node
14283 CLASSTYPE_NON_AGGREGATE (ref
) = true;
14285 if (PACK_EXPANSION_P (basetype
))
14286 basetype
= PACK_EXPANSION_PATTERN (basetype
);
14287 if (TREE_CODE (basetype
) == TYPE_DECL
)
14288 basetype
= TREE_TYPE (basetype
);
14289 if (!MAYBE_CLASS_TYPE_P (basetype
) || TREE_CODE (basetype
) == UNION_TYPE
)
14291 error ("base type %qT fails to be a struct or class type",
14296 base_binfo
= NULL_TREE
;
14297 if (CLASS_TYPE_P (basetype
) && !dependent_scope_p (basetype
))
14299 base_binfo
= TYPE_BINFO (basetype
);
14300 /* The original basetype could have been a typedef'd type. */
14301 basetype
= BINFO_TYPE (base_binfo
);
14303 /* Inherit flags from the base. */
14304 TYPE_HAS_NEW_OPERATOR (ref
)
14305 |= TYPE_HAS_NEW_OPERATOR (basetype
);
14306 TYPE_HAS_ARRAY_NEW_OPERATOR (ref
)
14307 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype
);
14308 TYPE_GETS_DELETE (ref
) |= TYPE_GETS_DELETE (basetype
);
14309 TYPE_HAS_CONVERSION (ref
) |= TYPE_HAS_CONVERSION (basetype
);
14310 CLASSTYPE_DIAMOND_SHAPED_P (ref
)
14311 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype
);
14312 CLASSTYPE_REPEATED_BASE_P (ref
)
14313 |= CLASSTYPE_REPEATED_BASE_P (basetype
);
14316 /* We must do this test after we've seen through a typedef
14318 if (TYPE_MARKED_P (basetype
))
14320 if (basetype
== ref
)
14321 error ("recursive type %qT undefined", basetype
);
14323 error ("duplicate base type %qT invalid", basetype
);
14327 if (PACK_EXPANSION_P (TREE_VALUE (base_list
)))
14328 /* Regenerate the pack expansion for the bases. */
14329 basetype
= make_pack_expansion (basetype
);
14331 TYPE_MARKED_P (basetype
) = 1;
14333 base_binfo
= copy_binfo (base_binfo
, basetype
, ref
,
14334 &igo_prev
, via_virtual
);
14335 if (!BINFO_INHERITANCE_CHAIN (base_binfo
))
14336 BINFO_INHERITANCE_CHAIN (base_binfo
) = binfo
;
14338 BINFO_BASE_APPEND (binfo
, base_binfo
);
14339 BINFO_BASE_ACCESS_APPEND (binfo
, access
);
14343 /* Update max_vbases to reflect the reality that we are dropping
14344 this base: if it reaches zero we want to undo the vec_alloc
14345 above to avoid inconsistencies during error-recovery: eg, in
14346 build_special_member_call, CLASSTYPE_VBASECLASSES non null
14347 and vtt null (c++/27952). */
14350 if (CLASS_TYPE_P (basetype
))
14352 -= vec_safe_length (CLASSTYPE_VBASECLASSES (basetype
));
14355 if (CLASSTYPE_VBASECLASSES (ref
)
14356 && max_vbases
== 0)
14357 vec_free (CLASSTYPE_VBASECLASSES (ref
));
14359 if (vec_safe_length (CLASSTYPE_VBASECLASSES (ref
)) < max_vbases
)
14360 /* If we didn't get max_vbases vbases, we must have shared at
14361 least one of them, and are therefore diamond shaped. */
14362 CLASSTYPE_DIAMOND_SHAPED_P (ref
) = 1;
14364 /* Unmark all the types. */
14365 for (i
= 0; BINFO_BASE_ITERATE (binfo
, i
, base_binfo
); i
++)
14366 TYPE_MARKED_P (BINFO_TYPE (base_binfo
)) = 0;
14367 TYPE_MARKED_P (ref
) = 0;
14369 /* Now see if we have a repeated base type. */
14370 if (!CLASSTYPE_REPEATED_BASE_P (ref
))
14372 for (base_binfo
= binfo
; base_binfo
;
14373 base_binfo
= TREE_CHAIN (base_binfo
))
14375 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo
)))
14377 CLASSTYPE_REPEATED_BASE_P (ref
) = 1;
14380 TYPE_MARKED_P (BINFO_TYPE (base_binfo
)) = 1;
14382 for (base_binfo
= binfo
; base_binfo
;
14383 base_binfo
= TREE_CHAIN (base_binfo
))
14384 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo
)))
14385 TYPE_MARKED_P (BINFO_TYPE (base_binfo
)) = 0;
14392 /* Copies the enum-related properties from type SRC to type DST.
14393 Used with the underlying type of an enum and the enum itself. */
14395 copy_type_enum (tree dst
, tree src
)
14398 for (t
= dst
; t
; t
= TYPE_NEXT_VARIANT (t
))
14400 TYPE_MIN_VALUE (t
) = TYPE_MIN_VALUE (src
);
14401 TYPE_MAX_VALUE (t
) = TYPE_MAX_VALUE (src
);
14402 TYPE_SIZE (t
) = TYPE_SIZE (src
);
14403 TYPE_SIZE_UNIT (t
) = TYPE_SIZE_UNIT (src
);
14404 SET_TYPE_MODE (dst
, TYPE_MODE (src
));
14405 TYPE_PRECISION (t
) = TYPE_PRECISION (src
);
14406 unsigned valign
= TYPE_ALIGN (src
);
14407 if (TYPE_USER_ALIGN (t
))
14408 valign
= MAX (valign
, TYPE_ALIGN (t
));
14410 TYPE_USER_ALIGN (t
) = TYPE_USER_ALIGN (src
);
14411 SET_TYPE_ALIGN (t
, valign
);
14412 TYPE_UNSIGNED (t
) = TYPE_UNSIGNED (src
);
14416 /* Begin compiling the definition of an enumeration type.
14419 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
14421 UNDERLYING_TYPE is the type that will be used as the storage for
14422 the enumeration type. This should be NULL_TREE if no storage type
14425 ATTRIBUTES are any attributes specified after the enum-key.
14427 SCOPED_ENUM_P is true if this is a scoped enumeration type.
14429 if IS_NEW is not NULL, gets TRUE iff a new type is created.
14431 Returns the type object, as yet incomplete.
14432 Also records info about it so that build_enumerator
14433 may be used to declare the individual values as they are read. */
14436 start_enum (tree name
, tree enumtype
, tree underlying_type
,
14437 tree attributes
, bool scoped_enum_p
, bool *is_new
)
14439 tree prevtype
= NULL_TREE
;
14440 gcc_assert (identifier_p (name
));
14444 /* [C++0x dcl.enum]p5:
14446 If not explicitly specified, the underlying type of a scoped
14447 enumeration type is int. */
14448 if (!underlying_type
&& scoped_enum_p
)
14449 underlying_type
= integer_type_node
;
14451 if (underlying_type
)
14452 underlying_type
= cv_unqualified (underlying_type
);
14454 /* If this is the real definition for a previous forward reference,
14455 fill in the contents in the same object that used to be the
14456 forward reference. */
14458 enumtype
= lookup_and_check_tag (enum_type
, name
,
14459 /*tag_scope=*/ts_current
,
14460 /*template_header_p=*/false);
14462 /* In case of a template_decl, the only check that should be deferred
14463 to instantiation time is the comparison of underlying types. */
14464 if (enumtype
&& TREE_CODE (enumtype
) == ENUMERAL_TYPE
)
14466 if (scoped_enum_p
!= SCOPED_ENUM_P (enumtype
))
14468 error_at (input_location
, "scoped/unscoped mismatch "
14469 "in enum %q#T", enumtype
);
14470 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype
)),
14471 "previous definition here");
14472 enumtype
= error_mark_node
;
14474 else if (ENUM_FIXED_UNDERLYING_TYPE_P (enumtype
) != !! underlying_type
)
14476 error_at (input_location
, "underlying type mismatch "
14477 "in enum %q#T", enumtype
);
14478 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype
)),
14479 "previous definition here");
14480 enumtype
= error_mark_node
;
14482 else if (underlying_type
&& ENUM_UNDERLYING_TYPE (enumtype
)
14483 && !same_type_p (underlying_type
,
14484 ENUM_UNDERLYING_TYPE (enumtype
)))
14486 error_at (input_location
, "different underlying type "
14487 "in enum %q#T", enumtype
);
14488 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype
)),
14489 "previous definition here");
14490 underlying_type
= NULL_TREE
;
14494 if (!enumtype
|| TREE_CODE (enumtype
) != ENUMERAL_TYPE
14495 || processing_template_decl
)
14497 /* In case of error, make a dummy enum to allow parsing to
14499 if (enumtype
== error_mark_node
)
14501 name
= make_anon_name ();
14502 enumtype
= NULL_TREE
;
14505 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
14506 of an opaque enum, or an opaque enum of an already defined
14507 enumeration (C++11).
14508 In any other case, it'll be NULL_TREE. */
14514 prevtype
= enumtype
;
14516 /* Do not push the decl more than once. */
14518 || TREE_CODE (enumtype
) != ENUMERAL_TYPE
)
14520 enumtype
= cxx_make_type (ENUMERAL_TYPE
);
14521 enumtype
= pushtag (name
, enumtype
, /*tag_scope=*/ts_current
);
14523 /* std::byte aliases anything. */
14524 if (enumtype
!= error_mark_node
14525 && TYPE_CONTEXT (enumtype
) == std_node
14526 && !strcmp ("byte", TYPE_NAME_STRING (enumtype
)))
14527 TYPE_ALIAS_SET (enumtype
) = 0;
14530 enumtype
= xref_tag (enum_type
, name
, /*tag_scope=*/ts_current
,
14533 if (enumtype
== error_mark_node
)
14534 return error_mark_node
;
14536 /* The enum is considered opaque until the opening '{' of the
14537 enumerator list. */
14538 SET_OPAQUE_ENUM_P (enumtype
, true);
14539 ENUM_FIXED_UNDERLYING_TYPE_P (enumtype
) = !! underlying_type
;
14542 SET_SCOPED_ENUM_P (enumtype
, scoped_enum_p
);
14544 cplus_decl_attributes (&enumtype
, attributes
, (int)ATTR_FLAG_TYPE_IN_PLACE
);
14546 if (underlying_type
)
14548 if (ENUM_UNDERLYING_TYPE (enumtype
))
14549 /* We already checked that it matches, don't change it to a different
14550 typedef variant. */;
14551 else if (CP_INTEGRAL_TYPE_P (underlying_type
))
14553 copy_type_enum (enumtype
, underlying_type
);
14554 ENUM_UNDERLYING_TYPE (enumtype
) = underlying_type
;
14556 else if (dependent_type_p (underlying_type
))
14557 ENUM_UNDERLYING_TYPE (enumtype
) = underlying_type
;
14559 error ("underlying type %qT of %qT must be an integral type",
14560 underlying_type
, enumtype
);
14563 /* If into a template class, the returned enum is always the first
14564 declaration (opaque or not) seen. This way all the references to
14565 this type will be to the same declaration. The following ones are used
14566 only to check for definition errors. */
14567 if (prevtype
&& processing_template_decl
)
14573 /* After processing and defining all the values of an enumeration type,
14574 install their decls in the enumeration type.
14575 ENUMTYPE is the type object. */
14578 finish_enum_value_list (tree enumtype
)
14581 tree underlying_type
;
14584 tree minnode
, maxnode
;
14587 bool fixed_underlying_type_p
14588 = ENUM_UNDERLYING_TYPE (enumtype
) != NULL_TREE
;
14590 /* We built up the VALUES in reverse order. */
14591 TYPE_VALUES (enumtype
) = nreverse (TYPE_VALUES (enumtype
));
14593 /* For an enum defined in a template, just set the type of the values;
14594 all further processing is postponed until the template is
14595 instantiated. We need to set the type so that tsubst of a CONST_DECL
14597 if (processing_template_decl
)
14599 for (values
= TYPE_VALUES (enumtype
);
14601 values
= TREE_CHAIN (values
))
14602 TREE_TYPE (TREE_VALUE (values
)) = enumtype
;
14606 /* Determine the minimum and maximum values of the enumerators. */
14607 if (TYPE_VALUES (enumtype
))
14609 minnode
= maxnode
= NULL_TREE
;
14611 for (values
= TYPE_VALUES (enumtype
);
14613 values
= TREE_CHAIN (values
))
14615 decl
= TREE_VALUE (values
);
14617 /* [dcl.enum]: Following the closing brace of an enum-specifier,
14618 each enumerator has the type of its enumeration. Prior to the
14619 closing brace, the type of each enumerator is the type of its
14620 initializing value. */
14621 TREE_TYPE (decl
) = enumtype
;
14623 /* Update the minimum and maximum values, if appropriate. */
14624 value
= DECL_INITIAL (decl
);
14625 if (value
== error_mark_node
)
14626 value
= integer_zero_node
;
14627 /* Figure out what the minimum and maximum values of the
14628 enumerators are. */
14630 minnode
= maxnode
= value
;
14631 else if (tree_int_cst_lt (maxnode
, value
))
14633 else if (tree_int_cst_lt (value
, minnode
))
14640 If the enumerator-list is empty, the underlying type is as if
14641 the enumeration had a single enumerator with value 0. */
14642 minnode
= maxnode
= integer_zero_node
;
14644 if (!fixed_underlying_type_p
)
14646 /* Compute the number of bits require to represent all values of the
14647 enumeration. We must do this before the type of MINNODE and
14648 MAXNODE are transformed, since tree_int_cst_min_precision relies
14649 on the TREE_TYPE of the value it is passed. */
14650 signop sgn
= tree_int_cst_sgn (minnode
) >= 0 ? UNSIGNED
: SIGNED
;
14651 int lowprec
= tree_int_cst_min_precision (minnode
, sgn
);
14652 int highprec
= tree_int_cst_min_precision (maxnode
, sgn
);
14653 int precision
= MAX (lowprec
, highprec
);
14655 bool use_short_enum
;
14657 /* Determine the underlying type of the enumeration.
14661 The underlying type of an enumeration is an integral type that
14662 can represent all the enumerator values defined in the
14663 enumeration. It is implementation-defined which integral type is
14664 used as the underlying type for an enumeration except that the
14665 underlying type shall not be larger than int unless the value of
14666 an enumerator cannot fit in an int or unsigned int.
14668 We use "int" or an "unsigned int" as the underlying type, even if
14669 a smaller integral type would work, unless the user has
14670 explicitly requested that we use the smallest possible type. The
14671 user can request that for all enumerations with a command line
14672 flag, or for just one enumeration with an attribute. */
14674 use_short_enum
= flag_short_enums
14675 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype
));
14677 /* If the precision of the type was specified with an attribute and it
14678 was too small, give an error. Otherwise, use it. */
14679 if (TYPE_PRECISION (enumtype
))
14681 if (precision
> TYPE_PRECISION (enumtype
))
14682 error ("specified mode too small for enumeral values");
14685 use_short_enum
= true;
14686 precision
= TYPE_PRECISION (enumtype
);
14690 for (itk
= (use_short_enum
? itk_char
: itk_int
);
14694 underlying_type
= integer_types
[itk
];
14695 if (underlying_type
!= NULL_TREE
14696 && TYPE_PRECISION (underlying_type
) >= precision
14697 && TYPE_SIGN (underlying_type
) == sgn
)
14700 if (itk
== itk_none
)
14704 IF no integral type can represent all the enumerator values, the
14705 enumeration is ill-formed. */
14706 error ("no integral type can represent all of the enumerator values "
14707 "for %qT", enumtype
);
14708 precision
= TYPE_PRECISION (long_long_integer_type_node
);
14709 underlying_type
= integer_types
[itk_unsigned_long_long
];
14714 The value of sizeof() applied to an enumeration type, an object
14715 of an enumeration type, or an enumerator, is the value of sizeof()
14716 applied to the underlying type. */
14717 copy_type_enum (enumtype
, underlying_type
);
14719 /* Compute the minimum and maximum values for the type.
14723 For an enumeration where emin is the smallest enumerator and emax
14724 is the largest, the values of the enumeration are the values of the
14725 underlying type in the range bmin to bmax, where bmin and bmax are,
14726 respectively, the smallest and largest values of the smallest bit-
14727 field that can store emin and emax. */
14729 /* The middle-end currently assumes that types with TYPE_PRECISION
14730 narrower than their underlying type are suitably zero or sign
14731 extended to fill their mode. Similarly, it assumes that the front
14732 end assures that a value of a particular type must be within
14733 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
14735 We used to set these fields based on bmin and bmax, but that led
14736 to invalid assumptions like optimizing away bounds checking. So
14737 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
14738 TYPE_MAX_VALUE to the values for the mode above and only restrict
14739 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
14740 ENUM_UNDERLYING_TYPE (enumtype
)
14741 = build_distinct_type_copy (underlying_type
);
14742 TYPE_PRECISION (ENUM_UNDERLYING_TYPE (enumtype
)) = precision
;
14743 set_min_and_max_values_for_integral_type
14744 (ENUM_UNDERLYING_TYPE (enumtype
), precision
, sgn
);
14746 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
14747 if (flag_strict_enums
)
14748 set_min_and_max_values_for_integral_type (enumtype
, precision
, sgn
);
14751 underlying_type
= ENUM_UNDERLYING_TYPE (enumtype
);
14753 /* Convert each of the enumerators to the type of the underlying
14754 type of the enumeration. */
14755 for (values
= TYPE_VALUES (enumtype
); values
; values
= TREE_CHAIN (values
))
14757 location_t saved_location
;
14759 decl
= TREE_VALUE (values
);
14760 saved_location
= input_location
;
14761 input_location
= DECL_SOURCE_LOCATION (decl
);
14762 if (fixed_underlying_type_p
)
14763 /* If the enumeration type has a fixed underlying type, we
14764 already checked all of the enumerator values. */
14765 value
= DECL_INITIAL (decl
);
14767 value
= perform_implicit_conversion (underlying_type
,
14768 DECL_INITIAL (decl
),
14769 tf_warning_or_error
);
14770 input_location
= saved_location
;
14772 /* Do not clobber shared ints. */
14773 if (value
!= error_mark_node
)
14775 value
= copy_node (value
);
14777 TREE_TYPE (value
) = enumtype
;
14779 DECL_INITIAL (decl
) = value
;
14782 /* Fix up all variant types of this enum type. */
14783 for (t
= TYPE_MAIN_VARIANT (enumtype
); t
; t
= TYPE_NEXT_VARIANT (t
))
14784 TYPE_VALUES (t
) = TYPE_VALUES (enumtype
);
14786 if (at_class_scope_p ()
14787 && COMPLETE_TYPE_P (current_class_type
)
14788 && UNSCOPED_ENUM_P (enumtype
))
14790 insert_late_enum_def_bindings (current_class_type
, enumtype
);
14791 /* TYPE_FIELDS needs fixup. */
14792 fixup_type_variants (current_class_type
);
14795 /* Finish debugging output for this type. */
14796 rest_of_type_compilation (enumtype
, namespace_bindings_p ());
14798 /* Each enumerator now has the type of its enumeration. Clear the cache
14799 so that this change in types doesn't confuse us later on. */
14800 clear_cv_and_fold_caches ();
14803 /* Finishes the enum type. This is called only the first time an
14804 enumeration is seen, be it opaque or odinary.
14805 ENUMTYPE is the type object. */
14808 finish_enum (tree enumtype
)
14810 if (processing_template_decl
)
14812 if (at_function_scope_p ())
14813 add_stmt (build_min (TAG_DEFN
, enumtype
));
14817 /* If this is a forward declaration, there should not be any variants,
14818 though we can get a variant in the middle of an enum-specifier with
14819 wacky code like 'enum E { e = sizeof(const E*) };' */
14820 gcc_assert (enumtype
== TYPE_MAIN_VARIANT (enumtype
)
14821 && (TYPE_VALUES (enumtype
)
14822 || !TYPE_NEXT_VARIANT (enumtype
)));
14825 /* Build and install a CONST_DECL for an enumeration constant of the
14826 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
14827 Apply ATTRIBUTES if available. LOC is the location of NAME.
14828 Assignment of sequential values by default is handled here. */
14831 build_enumerator (tree name
, tree value
, tree enumtype
, tree attributes
,
14838 /* scalar_constant_value will pull out this expression, so make sure
14839 it's folded as appropriate. */
14840 if (processing_template_decl
)
14841 value
= fold_non_dependent_expr (value
);
14843 /* If the VALUE was erroneous, pretend it wasn't there; that will
14844 result in the enum being assigned the next value in sequence. */
14845 if (value
== error_mark_node
)
14848 /* Remove no-op casts from the value. */
14850 STRIP_TYPE_NOPS (value
);
14852 if (! processing_template_decl
)
14854 /* Validate and default VALUE. */
14855 if (value
!= NULL_TREE
)
14857 if (!ENUM_UNDERLYING_TYPE (enumtype
))
14859 tree tmp_value
= build_expr_type_conversion (WANT_INT
| WANT_ENUM
,
14864 else if (! INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P
14865 (TREE_TYPE (value
)))
14866 value
= perform_implicit_conversion_flags
14867 (ENUM_UNDERLYING_TYPE (enumtype
), value
, tf_warning_or_error
,
14868 LOOKUP_IMPLICIT
| LOOKUP_NO_NARROWING
);
14870 if (value
== error_mark_node
)
14873 if (value
!= NULL_TREE
)
14875 if (! INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P
14876 (TREE_TYPE (value
)))
14878 error ("enumerator value for %qD must have integral or "
14879 "unscoped enumeration type", name
);
14884 value
= cxx_constant_value (value
);
14886 if (TREE_CODE (value
) != INTEGER_CST
)
14888 error ("enumerator value for %qD is not an integer "
14896 /* Default based on previous value. */
14897 if (value
== NULL_TREE
)
14899 if (TYPE_VALUES (enumtype
))
14903 /* C++03 7.2/4: If no initializer is specified for the first
14904 enumerator, the type is an unspecified integral
14905 type. Otherwise the type is the same as the type of the
14906 initializing value of the preceding enumerator unless the
14907 incremented value is not representable in that type, in
14908 which case the type is an unspecified integral type
14909 sufficient to contain the incremented value. */
14910 prev_value
= DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype
)));
14911 if (error_operand_p (prev_value
))
14912 value
= error_mark_node
;
14915 wi::overflow_type overflowed
;
14916 tree type
= TREE_TYPE (prev_value
);
14917 signop sgn
= TYPE_SIGN (type
);
14918 widest_int wi
= wi::add (wi::to_widest (prev_value
), 1, sgn
,
14922 bool pos
= !wi::neg_p (wi
, sgn
);
14923 if (!wi::fits_to_tree_p (wi
, type
))
14926 for (itk
= itk_int
; itk
!= itk_none
; itk
++)
14928 type
= integer_types
[itk
];
14929 if (type
!= NULL_TREE
14930 && (pos
|| !TYPE_UNSIGNED (type
))
14931 && wi::fits_to_tree_p (wi
, type
))
14934 if (type
&& cxx_dialect
< cxx11
14935 && itk
> itk_unsigned_long
)
14936 pedwarn (input_location
, OPT_Wlong_long
,
14938 incremented enumerator value is too large for %<unsigned long%>") : G_("\
14939 incremented enumerator value is too large for %<long%>"));
14941 if (type
== NULL_TREE
)
14942 overflowed
= wi::OVF_UNKNOWN
;
14944 value
= wide_int_to_tree (type
, wi
);
14949 error ("overflow in enumeration values at %qD", name
);
14950 value
= error_mark_node
;
14955 value
= integer_zero_node
;
14958 /* Remove no-op casts from the value. */
14959 STRIP_TYPE_NOPS (value
);
14961 /* If the underlying type of the enum is fixed, check whether
14962 the enumerator values fits in the underlying type. If it
14963 does not fit, the program is ill-formed [C++0x dcl.enum]. */
14964 if (ENUM_UNDERLYING_TYPE (enumtype
)
14966 && TREE_CODE (value
) == INTEGER_CST
)
14968 if (!int_fits_type_p (value
, ENUM_UNDERLYING_TYPE (enumtype
)))
14969 error ("enumerator value %qE is outside the range of underlying "
14970 "type %qT", value
, ENUM_UNDERLYING_TYPE (enumtype
));
14972 /* Convert the value to the appropriate type. */
14973 value
= fold_convert (ENUM_UNDERLYING_TYPE (enumtype
), value
);
14977 /* C++ associates enums with global, function, or class declarations. */
14978 context
= current_scope ();
14980 /* Build the actual enumeration constant. Note that the enumeration
14981 constants have the underlying type of the enum (if it is fixed)
14982 or the type of their initializer (if the underlying type of the
14983 enum is not fixed):
14987 If the underlying type is fixed, the type of each enumerator
14988 prior to the closing brace is the underlying type; if the
14989 initializing value of an enumerator cannot be represented by
14990 the underlying type, the program is ill-formed. If the
14991 underlying type is not fixed, the type of each enumerator is
14992 the type of its initializing value.
14994 If the underlying type is not fixed, it will be computed by
14995 finish_enum and we will reset the type of this enumerator. Of
14996 course, if we're processing a template, there may be no value. */
14997 type
= value
? TREE_TYPE (value
) : NULL_TREE
;
14999 decl
= build_decl (loc
, CONST_DECL
, name
, type
);
15001 DECL_CONTEXT (decl
) = enumtype
;
15002 TREE_CONSTANT (decl
) = 1;
15003 TREE_READONLY (decl
) = 1;
15004 DECL_INITIAL (decl
) = value
;
15007 cplus_decl_attributes (&decl
, attributes
, 0);
15009 if (context
&& context
== current_class_type
&& !SCOPED_ENUM_P (enumtype
))
15011 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
15012 on the TYPE_FIELDS list for `S'. (That's so that you can say
15013 things like `S::i' later.) */
15015 /* The enumerator may be getting declared outside of its enclosing
15018 class S { public: enum E : int; }; enum S::E : int { i = 7; };
15020 For which case we need to make sure that the access of `S::i'
15021 matches the access of `S::E'. */
15022 tree saved_cas
= current_access_specifier
;
15023 if (TREE_PRIVATE (TYPE_NAME (enumtype
)))
15024 current_access_specifier
= access_private_node
;
15025 else if (TREE_PROTECTED (TYPE_NAME (enumtype
)))
15026 current_access_specifier
= access_protected_node
;
15028 current_access_specifier
= access_public_node
;
15030 finish_member_declaration (decl
);
15032 current_access_specifier
= saved_cas
;
15037 /* Add this enumeration constant to the list for this type. */
15038 TYPE_VALUES (enumtype
) = tree_cons (name
, decl
, TYPE_VALUES (enumtype
));
15041 /* Look for an enumerator with the given NAME within the enumeration
15042 type ENUMTYPE. This routine is used primarily for qualified name
15043 lookup into an enumerator in C++0x, e.g.,
15045 enum class Color { Red, Green, Blue };
15047 Color color = Color::Red;
15049 Returns the value corresponding to the enumerator, or
15050 NULL_TREE if no such enumerator was found. */
15052 lookup_enumerator (tree enumtype
, tree name
)
15055 gcc_assert (enumtype
&& TREE_CODE (enumtype
) == ENUMERAL_TYPE
);
15057 e
= purpose_member (name
, TYPE_VALUES (enumtype
));
15058 return e
? TREE_VALUE (e
) : NULL_TREE
;
15062 /* We're defining DECL. Make sure that its type is OK. */
15065 check_function_type (tree decl
, tree current_function_parms
)
15067 tree fntype
= TREE_TYPE (decl
);
15068 tree return_type
= complete_type (TREE_TYPE (fntype
));
15070 /* In a function definition, arg types must be complete. */
15071 require_complete_types_for_parms (current_function_parms
);
15073 if (dependent_type_p (return_type
)
15074 || type_uses_auto (return_type
))
15076 if (!COMPLETE_OR_VOID_TYPE_P (return_type
))
15078 tree args
= TYPE_ARG_TYPES (fntype
);
15080 error ("return type %q#T is incomplete", return_type
);
15082 /* Make it return void instead. */
15083 if (TREE_CODE (fntype
) == METHOD_TYPE
)
15084 fntype
= build_method_type_directly (TREE_TYPE (TREE_VALUE (args
)),
15086 TREE_CHAIN (args
));
15088 fntype
= build_function_type (void_type_node
, args
);
15089 fntype
= (cp_build_type_attribute_variant
15090 (fntype
, TYPE_ATTRIBUTES (TREE_TYPE (decl
))));
15091 fntype
= cxx_copy_lang_qualifiers (fntype
, TREE_TYPE (decl
));
15092 TREE_TYPE (decl
) = fntype
;
15096 abstract_virtuals_error (decl
, TREE_TYPE (fntype
));
15097 maybe_warn_parm_abi (TREE_TYPE (fntype
),
15098 DECL_SOURCE_LOCATION (decl
));
15102 /* True iff FN is an implicitly-defined default constructor. */
15105 implicit_default_ctor_p (tree fn
)
15107 return (DECL_CONSTRUCTOR_P (fn
)
15108 && !user_provided_p (fn
)
15109 && sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (fn
)));
15112 /* Clobber the contents of *this to let the back end know that the object
15113 storage is dead when we enter the constructor or leave the destructor. */
15116 build_clobber_this ()
15118 /* Clobbering an empty base is pointless, and harmful if its one byte
15119 TYPE_SIZE overlays real data. */
15120 if (is_empty_class (current_class_type
))
15123 /* If we have virtual bases, clobber the whole object, but only if we're in
15124 charge. If we don't have virtual bases, clobber the as-base type so we
15125 don't mess with tail padding. */
15126 bool vbases
= CLASSTYPE_VBASECLASSES (current_class_type
);
15128 tree ctype
= current_class_type
;
15130 ctype
= CLASSTYPE_AS_BASE (ctype
);
15132 tree clobber
= build_clobber (ctype
);
15134 tree thisref
= current_class_ref
;
15135 if (ctype
!= current_class_type
)
15137 thisref
= build_nop (build_reference_type (ctype
), current_class_ptr
);
15138 thisref
= convert_from_reference (thisref
);
15141 tree exprstmt
= build2 (MODIFY_EXPR
, void_type_node
, thisref
, clobber
);
15143 exprstmt
= build_if_in_charge (exprstmt
);
15148 /* Create the FUNCTION_DECL for a function definition.
15149 DECLSPECS and DECLARATOR are the parts of the declaration;
15150 they describe the function's name and the type it returns,
15151 but twisted together in a fashion that parallels the syntax of C.
15153 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
15154 DECLARATOR is really the DECL for the function we are about to
15155 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
15156 indicating that the function is an inline defined in-class.
15158 This function creates a binding context for the function body
15159 as well as setting up the FUNCTION_DECL in current_function_decl.
15161 For C++, we must first check whether that datum makes any sense.
15162 For example, "class A local_a(1,2);" means that variable local_a
15163 is an aggregate of type A, which should have a constructor
15164 applied to it with the argument list [1, 2].
15166 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
15167 or may be a BLOCK if the function has been defined previously
15168 in this translation unit. On exit, DECL_INITIAL (decl1) will be
15169 error_mark_node if the function has never been defined, or
15170 a BLOCK if the function has been defined somewhere. */
15173 start_preparsed_function (tree decl1
, tree attrs
, int flags
)
15175 tree ctype
= NULL_TREE
;
15178 int doing_friend
= 0;
15179 cp_binding_level
*bl
;
15180 tree current_function_parms
;
15181 struct c_fileinfo
*finfo
15182 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1
)));
15183 bool honor_interface
;
15185 /* Sanity check. */
15186 gcc_assert (VOID_TYPE_P (TREE_VALUE (void_list_node
)));
15187 gcc_assert (TREE_CHAIN (void_list_node
) == NULL_TREE
);
15189 fntype
= TREE_TYPE (decl1
);
15190 if (TREE_CODE (fntype
) == METHOD_TYPE
)
15191 ctype
= TYPE_METHOD_BASETYPE (fntype
);
15193 /* ISO C++ 11.4/5. A friend function defined in a class is in
15194 the (lexical) scope of the class in which it is defined. */
15195 if (!ctype
&& DECL_FRIEND_P (decl1
))
15197 ctype
= DECL_FRIEND_CONTEXT (decl1
);
15199 /* CTYPE could be null here if we're dealing with a template;
15200 for example, `inline friend float foo()' inside a template
15201 will have no CTYPE set. */
15202 if (ctype
&& TREE_CODE (ctype
) != RECORD_TYPE
)
15208 if (DECL_DECLARED_INLINE_P (decl1
)
15209 && lookup_attribute ("noinline", attrs
))
15210 warning_at (DECL_SOURCE_LOCATION (decl1
), 0,
15211 "inline function %qD given attribute noinline", decl1
);
15213 /* Handle gnu_inline attribute. */
15214 if (GNU_INLINE_P (decl1
))
15216 DECL_EXTERNAL (decl1
) = 1;
15217 DECL_NOT_REALLY_EXTERN (decl1
) = 0;
15218 DECL_INTERFACE_KNOWN (decl1
) = 1;
15219 DECL_DISREGARD_INLINE_LIMITS (decl1
) = 1;
15222 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1
))
15223 /* This is a constructor, we must ensure that any default args
15224 introduced by this definition are propagated to the clones
15225 now. The clones are used directly in overload resolution. */
15226 adjust_clone_args (decl1
);
15228 /* Sometimes we don't notice that a function is a static member, and
15229 build a METHOD_TYPE for it. Fix that up now. */
15230 gcc_assert (!(ctype
!= NULL_TREE
&& DECL_STATIC_FUNCTION_P (decl1
)
15231 && TREE_CODE (TREE_TYPE (decl1
)) == METHOD_TYPE
));
15233 /* Set up current_class_type, and enter the scope of the class, if
15236 push_nested_class (ctype
);
15237 else if (DECL_STATIC_FUNCTION_P (decl1
))
15238 push_nested_class (DECL_CONTEXT (decl1
));
15240 /* Now that we have entered the scope of the class, we must restore
15241 the bindings for any template parameters surrounding DECL1, if it
15242 is an inline member template. (Order is important; consider the
15243 case where a template parameter has the same name as a field of
15244 the class.) It is not until after this point that
15245 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
15246 if (flags
& SF_INCLASS_INLINE
)
15247 maybe_begin_member_template_processing (decl1
);
15249 /* Effective C++ rule 15. */
15251 && DECL_ASSIGNMENT_OPERATOR_P (decl1
)
15252 && DECL_OVERLOADED_OPERATOR_IS (decl1
, NOP_EXPR
)
15253 && VOID_TYPE_P (TREE_TYPE (fntype
)))
15254 warning (OPT_Weffc__
,
15255 "%<operator=%> should return a reference to %<*this%>");
15257 /* Make the init_value nonzero so pushdecl knows this is not tentative.
15258 error_mark_node is replaced below (in poplevel) with the BLOCK. */
15259 if (!DECL_INITIAL (decl1
))
15260 DECL_INITIAL (decl1
) = error_mark_node
;
15262 /* This function exists in static storage.
15263 (This does not mean `static' in the C sense!) */
15264 TREE_STATIC (decl1
) = 1;
15266 /* We must call push_template_decl after current_class_type is set
15267 up. (If we are processing inline definitions after exiting a
15268 class scope, current_class_type will be NULL_TREE until set above
15269 by push_nested_class.) */
15270 if (processing_template_decl
)
15272 tree newdecl1
= push_template_decl (decl1
);
15273 if (newdecl1
== error_mark_node
)
15275 if (ctype
|| DECL_STATIC_FUNCTION_P (decl1
))
15276 pop_nested_class ();
15282 /* Make sure the parameter and return types are reasonable. When
15283 you declare a function, these types can be incomplete, but they
15284 must be complete when you define the function. */
15285 check_function_type (decl1
, DECL_ARGUMENTS (decl1
));
15287 /* Build the return declaration for the function. */
15288 restype
= TREE_TYPE (fntype
);
15290 if (DECL_RESULT (decl1
) == NULL_TREE
)
15294 resdecl
= build_decl (input_location
, RESULT_DECL
, 0, restype
);
15295 DECL_ARTIFICIAL (resdecl
) = 1;
15296 DECL_IGNORED_P (resdecl
) = 1;
15297 DECL_RESULT (decl1
) = resdecl
;
15299 cp_apply_type_quals_to_decl (cp_type_quals (restype
), resdecl
);
15302 /* Record the decl so that the function name is defined.
15303 If we already have a decl for this name, and it is a FUNCTION_DECL,
15304 use the old decl. */
15305 if (!processing_template_decl
&& !(flags
& SF_PRE_PARSED
))
15307 /* A specialization is not used to guide overload resolution. */
15308 if (!DECL_FUNCTION_MEMBER_P (decl1
)
15309 && !(DECL_USE_TEMPLATE (decl1
) &&
15310 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1
))))
15312 tree olddecl
= pushdecl (decl1
);
15314 if (olddecl
== error_mark_node
)
15315 /* If something went wrong when registering the declaration,
15316 use DECL1; we have to have a FUNCTION_DECL to use when
15317 parsing the body of the function. */
15321 /* Otherwise, OLDDECL is either a previous declaration
15322 of the same function or DECL1 itself. */
15324 if (warn_missing_declarations
15325 && olddecl
== decl1
15326 && !DECL_MAIN_P (decl1
)
15327 && TREE_PUBLIC (decl1
)
15328 && !DECL_DECLARED_INLINE_P (decl1
))
15332 /* Check whether DECL1 is in an anonymous
15334 for (context
= DECL_CONTEXT (decl1
);
15336 context
= DECL_CONTEXT (context
))
15338 if (TREE_CODE (context
) == NAMESPACE_DECL
15339 && DECL_NAME (context
) == NULL_TREE
)
15343 if (context
== NULL
)
15344 warning_at (DECL_SOURCE_LOCATION (decl1
),
15345 OPT_Wmissing_declarations
,
15346 "no previous declaration for %qD", decl1
);
15354 /* We need to set the DECL_CONTEXT. */
15355 if (!DECL_CONTEXT (decl1
) && DECL_TEMPLATE_INFO (decl1
))
15356 DECL_CONTEXT (decl1
) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1
));
15358 fntype
= TREE_TYPE (decl1
);
15359 restype
= TREE_TYPE (fntype
);
15361 /* If #pragma weak applies, mark the decl appropriately now.
15362 The pragma only applies to global functions. Because
15363 determining whether or not the #pragma applies involves
15364 computing the mangled name for the declaration, we cannot
15365 apply the pragma until after we have merged this declaration
15366 with any previous declarations; if the original declaration
15367 has a linkage specification, that specification applies to
15368 the definition as well, and may affect the mangled name. */
15369 if (DECL_FILE_SCOPE_P (decl1
))
15370 maybe_apply_pragma_weak (decl1
);
15373 /* We are now in the scope of the function being defined. */
15374 current_function_decl
= decl1
;
15376 /* Save the parm names or decls from this function's declarator
15377 where store_parm_decls will find them. */
15378 current_function_parms
= DECL_ARGUMENTS (decl1
);
15380 /* Let the user know we're compiling this function. */
15381 announce_function (decl1
);
15383 gcc_assert (DECL_INITIAL (decl1
));
15385 /* This function may already have been parsed, in which case just
15386 return; our caller will skip over the body without parsing. */
15387 if (DECL_INITIAL (decl1
) != error_mark_node
)
15390 /* Initialize RTL machinery. We cannot do this until
15391 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
15392 even when processing a template; this is how we get
15393 CFUN set up, and our per-function variables initialized.
15394 FIXME factor out the non-RTL stuff. */
15395 bl
= current_binding_level
;
15396 allocate_struct_function (decl1
, processing_template_decl
);
15398 /* Initialize the language data structures. Whenever we start
15399 a new function, we destroy temporaries in the usual way. */
15400 cfun
->language
= ggc_cleared_alloc
<language_function
> ();
15401 current_stmt_tree ()->stmts_are_full_exprs_p
= 1;
15402 current_binding_level
= bl
;
15404 if (!processing_template_decl
&& type_uses_auto (restype
))
15406 FNDECL_USED_AUTO (decl1
) = true;
15407 current_function_auto_return_pattern
= restype
;
15410 /* Start the statement-tree, start the tree now. */
15411 DECL_SAVED_TREE (decl1
) = push_stmt_list ();
15413 /* If we are (erroneously) defining a function that we have already
15414 defined before, wipe out what we knew before. */
15415 if (!DECL_PENDING_INLINE_P (decl1
))
15416 DECL_SAVED_FUNCTION_DATA (decl1
) = NULL
;
15418 if (ctype
&& !doing_friend
&& !DECL_STATIC_FUNCTION_P (decl1
))
15420 /* We know that this was set up by `grokclassfn'. We do not
15421 wait until `store_parm_decls', since evil parse errors may
15422 never get us to that point. Here we keep the consistency
15423 between `current_class_type' and `current_class_ptr'. */
15424 tree t
= DECL_ARGUMENTS (decl1
);
15426 gcc_assert (t
!= NULL_TREE
&& TREE_CODE (t
) == PARM_DECL
);
15427 gcc_assert (TYPE_PTR_P (TREE_TYPE (t
)));
15429 cp_function_chain
->x_current_class_ref
15430 = cp_build_fold_indirect_ref (t
);
15431 /* Set this second to avoid shortcut in cp_build_indirect_ref. */
15432 cp_function_chain
->x_current_class_ptr
= t
;
15434 /* Constructors and destructors need to know whether they're "in
15435 charge" of initializing virtual base classes. */
15436 t
= DECL_CHAIN (t
);
15437 if (DECL_HAS_IN_CHARGE_PARM_P (decl1
))
15439 current_in_charge_parm
= t
;
15440 t
= DECL_CHAIN (t
);
15442 if (DECL_HAS_VTT_PARM_P (decl1
))
15444 gcc_assert (DECL_NAME (t
) == vtt_parm_identifier
);
15445 current_vtt_parm
= t
;
15449 honor_interface
= (!DECL_TEMPLATE_INSTANTIATION (decl1
)
15450 /* Implicitly-defined methods (like the
15451 destructor for a class in which no destructor
15452 is explicitly declared) must not be defined
15453 until their definition is needed. So, we
15454 ignore interface specifications for
15455 compiler-generated functions. */
15456 && !DECL_ARTIFICIAL (decl1
));
15458 if (processing_template_decl
)
15459 /* Don't mess with interface flags. */;
15460 else if (DECL_INTERFACE_KNOWN (decl1
))
15462 tree ctx
= decl_function_context (decl1
);
15464 if (DECL_NOT_REALLY_EXTERN (decl1
))
15465 DECL_EXTERNAL (decl1
) = 0;
15467 if (ctx
!= NULL_TREE
&& vague_linkage_p (ctx
))
15468 /* This is a function in a local class in an extern inline
15469 or template function. */
15470 comdat_linkage (decl1
);
15472 /* If this function belongs to an interface, it is public.
15473 If it belongs to someone else's interface, it is also external.
15474 This only affects inlines and template instantiations. */
15475 else if (!finfo
->interface_unknown
&& honor_interface
)
15477 if (DECL_DECLARED_INLINE_P (decl1
)
15478 || DECL_TEMPLATE_INSTANTIATION (decl1
))
15480 DECL_EXTERNAL (decl1
)
15481 = (finfo
->interface_only
15482 || (DECL_DECLARED_INLINE_P (decl1
)
15483 && ! flag_implement_inlines
15484 && !DECL_VINDEX (decl1
)));
15486 /* For WIN32 we also want to put these in linkonce sections. */
15487 maybe_make_one_only (decl1
);
15490 DECL_EXTERNAL (decl1
) = 0;
15491 DECL_INTERFACE_KNOWN (decl1
) = 1;
15492 /* If this function is in an interface implemented in this file,
15493 make sure that the back end knows to emit this function
15495 if (!DECL_EXTERNAL (decl1
))
15496 mark_needed (decl1
);
15498 else if (finfo
->interface_unknown
&& finfo
->interface_only
15499 && honor_interface
)
15501 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
15502 interface, we will have both finfo->interface_unknown and
15503 finfo->interface_only set. In that case, we don't want to
15504 use the normal heuristics because someone will supply a
15505 #pragma implementation elsewhere, and deducing it here would
15506 produce a conflict. */
15507 comdat_linkage (decl1
);
15508 DECL_EXTERNAL (decl1
) = 0;
15509 DECL_INTERFACE_KNOWN (decl1
) = 1;
15510 DECL_DEFER_OUTPUT (decl1
) = 1;
15514 /* This is a definition, not a reference.
15515 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
15516 if (!GNU_INLINE_P (decl1
))
15517 DECL_EXTERNAL (decl1
) = 0;
15519 if ((DECL_DECLARED_INLINE_P (decl1
)
15520 || DECL_TEMPLATE_INSTANTIATION (decl1
))
15521 && ! DECL_INTERFACE_KNOWN (decl1
))
15522 DECL_DEFER_OUTPUT (decl1
) = 1;
15524 DECL_INTERFACE_KNOWN (decl1
) = 1;
15527 /* Determine the ELF visibility attribute for the function. We must not
15528 do this before calling "pushdecl", as we must allow "duplicate_decls"
15529 to merge any attributes appropriately. We also need to wait until
15531 if (!DECL_CLONED_FUNCTION_P (decl1
))
15532 determine_visibility (decl1
);
15534 if (!processing_template_decl
)
15535 maybe_instantiate_noexcept (decl1
);
15537 begin_scope (sk_function_parms
, decl1
);
15541 if (DECL_DESTRUCTOR_P (decl1
)
15542 || (DECL_CONSTRUCTOR_P (decl1
)
15543 && targetm
.cxx
.cdtor_returns_this ()))
15545 cdtor_label
= create_artificial_label (input_location
);
15546 LABEL_DECL_CDTOR (cdtor_label
) = true;
15549 start_fname_decls ();
15551 store_parm_decls (current_function_parms
);
15553 if (!processing_template_decl
15554 && (flag_lifetime_dse
> 1)
15555 && DECL_CONSTRUCTOR_P (decl1
)
15556 && !DECL_CLONED_FUNCTION_P (decl1
)
15557 /* Clobbering an empty base is harmful if it overlays real data. */
15558 && !is_empty_class (current_class_type
)
15559 /* We can't clobber safely for an implicitly-defined default constructor
15560 because part of the initialization might happen before we enter the
15561 constructor, via AGGR_INIT_ZERO_FIRST (c++/68006). */
15562 && !implicit_default_ctor_p (decl1
))
15563 finish_expr_stmt (build_clobber_this ());
15565 if (!processing_template_decl
15566 && DECL_CONSTRUCTOR_P (decl1
)
15567 && sanitize_flags_p (SANITIZE_VPTR
)
15568 && !DECL_CLONED_FUNCTION_P (decl1
)
15569 && !implicit_default_ctor_p (decl1
))
15570 cp_ubsan_maybe_initialize_vtbl_ptrs (current_class_ptr
);
15572 start_lambda_scope (decl1
);
15578 /* Like start_preparsed_function, except that instead of a
15579 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
15581 Returns true on success. If the DECLARATOR is not suitable
15582 for a function, we return false, which tells the parser to
15583 skip the entire function. */
15586 start_function (cp_decl_specifier_seq
*declspecs
,
15587 const cp_declarator
*declarator
,
15592 decl1
= grokdeclarator (declarator
, declspecs
, FUNCDEF
, 1, &attrs
);
15593 invoke_plugin_callbacks (PLUGIN_START_PARSE_FUNCTION
, decl1
);
15594 if (decl1
== error_mark_node
)
15596 /* If the declarator is not suitable for a function definition,
15597 cause a syntax error. */
15598 if (decl1
== NULL_TREE
|| TREE_CODE (decl1
) != FUNCTION_DECL
)
15600 error ("invalid function declaration");
15604 if (DECL_MAIN_P (decl1
))
15605 /* main must return int. grokfndecl should have corrected it
15606 (and issued a diagnostic) if the user got it wrong. */
15607 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1
)),
15608 integer_type_node
));
15610 return start_preparsed_function (decl1
, attrs
, /*flags=*/SF_DEFAULT
);
15613 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
15617 use_eh_spec_block (tree fn
)
15619 return (flag_exceptions
&& flag_enforce_eh_specs
15620 && !processing_template_decl
15621 && !type_throw_all_p (TREE_TYPE (fn
))
15622 /* We insert the EH_SPEC_BLOCK only in the original
15623 function; then, it is copied automatically to the
15625 && !DECL_CLONED_FUNCTION_P (fn
)
15626 /* Implicitly-generated constructors and destructors have
15627 exception specifications. However, those specifications
15628 are the union of the possible exceptions specified by the
15629 constructors/destructors for bases and members, so no
15630 unallowed exception will ever reach this function. By
15631 not creating the EH_SPEC_BLOCK we save a little memory,
15632 and we avoid spurious warnings about unreachable
15634 && !DECL_DEFAULTED_FN (fn
));
15637 /* Store the parameter declarations into the current function declaration.
15638 This is called after parsing the parameter declarations, before
15639 digesting the body of the function.
15641 Also install to binding contour return value identifier, if any. */
15644 store_parm_decls (tree current_function_parms
)
15646 tree fndecl
= current_function_decl
;
15649 /* This is a chain of any other decls that came in among the parm
15650 declarations. If a parm is declared with enum {foo, bar} x;
15651 then CONST_DECLs for foo and bar are put here. */
15652 tree nonparms
= NULL_TREE
;
15654 if (current_function_parms
)
15656 /* This case is when the function was defined with an ANSI prototype.
15657 The parms already have decls, so we need not do anything here
15658 except record them as in effect
15659 and complain if any redundant old-style parm decls were written. */
15661 tree specparms
= current_function_parms
;
15664 /* Must clear this because it might contain TYPE_DECLs declared
15666 current_binding_level
->names
= NULL
;
15668 /* If we're doing semantic analysis, then we'll call pushdecl
15669 for each of these. We must do them in reverse order so that
15670 they end in the correct forward order. */
15671 specparms
= nreverse (specparms
);
15673 for (parm
= specparms
; parm
; parm
= next
)
15675 next
= DECL_CHAIN (parm
);
15676 if (TREE_CODE (parm
) == PARM_DECL
)
15680 /* If we find an enum constant or a type tag,
15681 put it aside for the moment. */
15682 TREE_CHAIN (parm
) = NULL_TREE
;
15683 nonparms
= chainon (nonparms
, parm
);
15687 /* Get the decls in their original chain order and record in the
15688 function. This is all and only the PARM_DECLs that were
15689 pushed into scope by the loop above. */
15690 DECL_ARGUMENTS (fndecl
) = get_local_decls ();
15693 DECL_ARGUMENTS (fndecl
) = NULL_TREE
;
15695 /* Now store the final chain of decls for the arguments
15696 as the decl-chain of the current lexical scope.
15697 Put the enumerators in as well, at the front so that
15698 DECL_ARGUMENTS is not modified. */
15699 current_binding_level
->names
= chainon (nonparms
, DECL_ARGUMENTS (fndecl
));
15701 if (use_eh_spec_block (current_function_decl
))
15702 current_eh_spec_block
= begin_eh_spec_block ();
15706 /* We have finished doing semantic analysis on DECL, but have not yet
15707 generated RTL for its body. Save away our current state, so that
15708 when we want to generate RTL later we know what to do. */
15711 save_function_data (tree decl
)
15713 struct language_function
*f
;
15715 /* Save the language-specific per-function data so that we can
15716 get it back when we really expand this function. */
15717 gcc_assert (!DECL_PENDING_INLINE_P (decl
));
15720 f
= ggc_alloc
<language_function
> ();
15721 memcpy (f
, cp_function_chain
, sizeof (struct language_function
));
15722 DECL_SAVED_FUNCTION_DATA (decl
) = f
;
15724 /* Clear out the bits we don't need. */
15725 f
->base
.x_stmt_tree
.x_cur_stmt_list
= NULL
;
15726 f
->bindings
= NULL
;
15727 f
->base
.local_typedefs
= NULL
;
15731 /* Set the return value of the constructor (if present). */
15734 finish_constructor_body (void)
15739 if (targetm
.cxx
.cdtor_returns_this ())
15741 /* Any return from a constructor will end up here. */
15742 add_stmt (build_stmt (input_location
, LABEL_EXPR
, cdtor_label
));
15744 val
= DECL_ARGUMENTS (current_function_decl
);
15745 val
= build2 (MODIFY_EXPR
, TREE_TYPE (val
),
15746 DECL_RESULT (current_function_decl
), val
);
15747 /* Return the address of the object. */
15748 exprstmt
= build_stmt (input_location
, RETURN_EXPR
, val
);
15749 add_stmt (exprstmt
);
15753 /* Do all the processing for the beginning of a destructor; set up the
15754 vtable pointers and cleanups for bases and members. */
15757 begin_destructor_body (void)
15759 tree compound_stmt
;
15761 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
15762 issued an error message. We still want to try to process the
15763 body of the function, but initialize_vtbl_ptrs will crash if
15764 TYPE_BINFO is NULL. */
15765 if (COMPLETE_TYPE_P (current_class_type
))
15767 compound_stmt
= begin_compound_stmt (0);
15768 /* Make all virtual function table pointers in non-virtual base
15769 classes point to CURRENT_CLASS_TYPE's virtual function
15771 initialize_vtbl_ptrs (current_class_ptr
);
15772 finish_compound_stmt (compound_stmt
);
15774 if (flag_lifetime_dse
15775 /* Clobbering an empty base is harmful if it overlays real data. */
15776 && !is_empty_class (current_class_type
))
15778 if (sanitize_flags_p (SANITIZE_VPTR
)
15779 && (flag_sanitize_recover
& SANITIZE_VPTR
) == 0
15780 && TYPE_CONTAINS_VPTR_P (current_class_type
))
15782 tree binfo
= TYPE_BINFO (current_class_type
);
15784 = cp_build_fold_indirect_ref (current_class_ptr
);
15786 tree vtbl_ptr
= build_vfield_ref (ref
, TREE_TYPE (binfo
));
15787 tree vtbl
= build_zero_cst (TREE_TYPE (vtbl_ptr
));
15788 tree stmt
= cp_build_modify_expr (input_location
, vtbl_ptr
,
15790 tf_warning_or_error
);
15791 /* If the vptr is shared with some virtual nearly empty base,
15792 don't clear it if not in charge, the dtor of the virtual
15793 nearly empty base will do that later. */
15794 if (CLASSTYPE_VBASECLASSES (current_class_type
)
15795 && CLASSTYPE_PRIMARY_BINFO (current_class_type
)
15797 (CLASSTYPE_PRIMARY_BINFO (current_class_type
)))
15799 stmt
= convert_to_void (stmt
, ICV_STATEMENT
,
15800 tf_warning_or_error
);
15801 stmt
= build_if_in_charge (stmt
);
15803 finish_decl_cleanup (NULL_TREE
, stmt
);
15806 finish_decl_cleanup (NULL_TREE
, build_clobber_this ());
15809 /* And insert cleanups for our bases and members so that they
15810 will be properly destroyed if we throw. */
15811 push_base_cleanups ();
15815 /* At the end of every destructor we generate code to delete the object if
15816 necessary. Do that now. */
15819 finish_destructor_body (void)
15823 /* Any return from a destructor will end up here; that way all base
15824 and member cleanups will be run when the function returns. */
15825 add_stmt (build_stmt (input_location
, LABEL_EXPR
, cdtor_label
));
15827 if (targetm
.cxx
.cdtor_returns_this ())
15831 val
= DECL_ARGUMENTS (current_function_decl
);
15832 val
= build2 (MODIFY_EXPR
, TREE_TYPE (val
),
15833 DECL_RESULT (current_function_decl
), val
);
15834 /* Return the address of the object. */
15835 exprstmt
= build_stmt (input_location
, RETURN_EXPR
, val
);
15836 add_stmt (exprstmt
);
15840 /* Do the necessary processing for the beginning of a function body, which
15841 in this case includes member-initializers, but not the catch clauses of
15842 a function-try-block. Currently, this means opening a binding level
15843 for the member-initializers (in a ctor), member cleanups (in a dtor),
15844 and capture proxies (in a lambda operator()). */
15847 begin_function_body (void)
15851 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl
))
15854 if (processing_template_decl
)
15855 /* Do nothing now. */;
15857 /* Always keep the BLOCK node associated with the outermost pair of
15858 curly braces of a function. These are needed for correct
15859 operation of dwarfout.c. */
15860 keep_next_level (true);
15862 stmt
= begin_compound_stmt (BCS_FN_BODY
);
15864 if (processing_template_decl
)
15865 /* Do nothing now. */;
15866 else if (DECL_DESTRUCTOR_P (current_function_decl
))
15867 begin_destructor_body ();
15872 /* Do the processing for the end of a function body. Currently, this means
15873 closing out the cleanups for fully-constructed bases and members, and in
15874 the case of the destructor, deleting the object if desired. Again, this
15875 is only meaningful for [cd]tors, since they are the only functions where
15876 there is a significant distinction between the main body and any
15877 function catch clauses. Handling, say, main() return semantics here
15878 would be wrong, as flowing off the end of a function catch clause for
15879 main() would also need to return 0. */
15882 finish_function_body (tree compstmt
)
15884 if (compstmt
== NULL_TREE
)
15887 /* Close the block. */
15888 finish_compound_stmt (compstmt
);
15890 if (processing_template_decl
)
15891 /* Do nothing now. */;
15892 else if (DECL_CONSTRUCTOR_P (current_function_decl
))
15893 finish_constructor_body ();
15894 else if (DECL_DESTRUCTOR_P (current_function_decl
))
15895 finish_destructor_body ();
15898 /* Given a function, returns the BLOCK corresponding to the outermost level
15899 of curly braces, skipping the artificial block created for constructor
15903 outer_curly_brace_block (tree fndecl
)
15905 tree block
= DECL_INITIAL (fndecl
);
15906 if (BLOCK_OUTER_CURLY_BRACE_P (block
))
15908 block
= BLOCK_SUBBLOCKS (block
);
15909 if (BLOCK_OUTER_CURLY_BRACE_P (block
))
15911 block
= BLOCK_SUBBLOCKS (block
);
15912 gcc_assert (BLOCK_OUTER_CURLY_BRACE_P (block
));
15916 /* If FNDECL is a class's key method, add the class to the list of
15917 keyed classes that should be emitted. */
15920 record_key_method_defined (tree fndecl
)
15922 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl
)
15923 && DECL_VIRTUAL_P (fndecl
)
15924 && !processing_template_decl
)
15926 tree fnclass
= DECL_CONTEXT (fndecl
);
15927 if (fndecl
== CLASSTYPE_KEY_METHOD (fnclass
))
15928 vec_safe_push (keyed_classes
, fnclass
);
15932 /* Subroutine of finish_function.
15933 Save the body of constexpr functions for possible
15934 future compile time evaluation. */
15937 maybe_save_function_definition (tree fun
)
15939 if (!processing_template_decl
15940 && DECL_DECLARED_CONSTEXPR_P (fun
)
15941 && !cp_function_chain
->invalid_constexpr
15942 && !DECL_CLONED_FUNCTION_P (fun
))
15943 register_constexpr_fundef (fun
, DECL_SAVED_TREE (fun
));
15946 /* Attempt to add a fix-it hint to RICHLOC suggesting the insertion
15947 of "return *this;" immediately before its location, using FNDECL's
15948 first statement (if any) to give the indentation, if appropriate. */
15951 add_return_star_this_fixit (gcc_rich_location
*richloc
, tree fndecl
)
15953 location_t indent
= UNKNOWN_LOCATION
;
15954 tree stmts
= expr_first (DECL_SAVED_TREE (fndecl
));
15956 indent
= EXPR_LOCATION (stmts
);
15957 richloc
->add_fixit_insert_formatted ("return *this;",
15958 richloc
->get_loc (),
15962 /* Finish up a function declaration and compile that function
15963 all the way to assembler language output. The free the storage
15964 for the function definition. INLINE_P is TRUE if we just
15965 finished processing the body of an in-class inline function
15966 definition. (This processing will have taken place after the
15967 class definition is complete.) */
15970 finish_function (bool inline_p
)
15972 tree fndecl
= current_function_decl
;
15973 tree fntype
, ctype
= NULL_TREE
;
15975 /* When we get some parse errors, we can end up without a
15976 current_function_decl, so cope. */
15977 if (fndecl
== NULL_TREE
)
15978 return error_mark_node
;
15980 finish_lambda_scope ();
15982 if (c_dialect_objc ())
15983 objc_finish_function ();
15985 record_key_method_defined (fndecl
);
15987 fntype
= TREE_TYPE (fndecl
);
15989 /* TREE_READONLY (fndecl) = 1;
15990 This caused &foo to be of type ptr-to-const-function
15991 which then got a warning when stored in a ptr-to-function variable. */
15993 gcc_assert (building_stmt_list_p ());
15994 /* The current function is being defined, so its DECL_INITIAL should
15995 be set, and unless there's a multiple definition, it should be
15996 error_mark_node. */
15997 gcc_assert (DECL_INITIAL (fndecl
) == error_mark_node
);
15999 /* For a cloned function, we've already got all the code we need;
16000 there's no need to add any extra bits. */
16001 if (!DECL_CLONED_FUNCTION_P (fndecl
))
16003 /* Make it so that `main' always returns 0 by default. */
16004 if (DECL_MAIN_P (current_function_decl
))
16005 finish_return_stmt (integer_zero_node
);
16007 if (use_eh_spec_block (current_function_decl
))
16008 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
16009 (TREE_TYPE (current_function_decl
)),
16010 current_eh_spec_block
);
16013 /* If we're saving up tree structure, tie off the function now. */
16014 DECL_SAVED_TREE (fndecl
) = pop_stmt_list (DECL_SAVED_TREE (fndecl
));
16016 finish_fname_decls ();
16018 /* If this function can't throw any exceptions, remember that. */
16019 if (!processing_template_decl
16020 && !cp_function_chain
->can_throw
16021 && !flag_non_call_exceptions
16022 && !decl_replaceable_p (fndecl
))
16023 TREE_NOTHROW (fndecl
) = 1;
16025 /* This must come after expand_function_end because cleanups might
16026 have declarations (from inline functions) that need to go into
16027 this function's blocks. */
16029 /* If the current binding level isn't the outermost binding level
16030 for this function, either there is a bug, or we have experienced
16031 syntax errors and the statement tree is malformed. */
16032 if (current_binding_level
->kind
!= sk_function_parms
)
16034 /* Make sure we have already experienced errors. */
16035 gcc_assert (errorcount
);
16037 /* Throw away the broken statement tree and extra binding
16039 DECL_SAVED_TREE (fndecl
) = alloc_stmt_list ();
16041 while (current_binding_level
->kind
!= sk_function_parms
)
16043 if (current_binding_level
->kind
== sk_class
)
16044 pop_nested_class ();
16046 poplevel (0, 0, 0);
16049 poplevel (1, 0, 1);
16051 /* Statements should always be full-expressions at the outermost set
16052 of curly braces for a function. */
16053 gcc_assert (stmts_are_full_exprs_p ());
16055 /* If there are no return statements in a function with auto return type,
16056 the return type is void. But if the declared type is something like
16057 auto*, this is an error. */
16058 if (!processing_template_decl
&& FNDECL_USED_AUTO (fndecl
)
16059 && TREE_TYPE (fntype
) == current_function_auto_return_pattern
)
16061 if (is_auto (current_function_auto_return_pattern
))
16063 apply_deduced_return_type (fndecl
, void_type_node
);
16064 fntype
= TREE_TYPE (fndecl
);
16066 else if (!current_function_returns_value
16067 && !current_function_returns_null
)
16069 error ("no return statements in function returning %qT",
16070 current_function_auto_return_pattern
);
16071 inform (input_location
, "only plain %<auto%> return type can be "
16072 "deduced to %<void%>");
16076 // If this is a concept, check that the definition is reasonable.
16077 if (DECL_DECLARED_CONCEPT_P (fndecl
))
16078 check_function_concept (fndecl
);
16080 /* Lambda closure members are implicitly constexpr if possible. */
16081 if (cxx_dialect
>= cxx17
16082 && LAMBDA_TYPE_P (CP_DECL_CONTEXT (fndecl
)))
16083 DECL_DECLARED_CONSTEXPR_P (fndecl
)
16084 = ((processing_template_decl
16085 || is_valid_constexpr_fn (fndecl
, /*complain*/false))
16086 && potential_constant_expression (DECL_SAVED_TREE (fndecl
)));
16088 /* Save constexpr function body before it gets munged by
16089 the NRV transformation. */
16090 maybe_save_function_definition (fndecl
);
16092 /* Invoke the pre-genericize plugin before we start munging things. */
16093 if (!processing_template_decl
)
16094 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE
, fndecl
);
16096 /* Perform delayed folding before NRV transformation. */
16097 if (!processing_template_decl
)
16098 cp_fold_function (fndecl
);
16100 /* Set up the named return value optimization, if we can. Candidate
16101 variables are selected in check_return_expr. */
16102 if (current_function_return_value
)
16104 tree r
= current_function_return_value
;
16107 if (r
!= error_mark_node
16108 /* This is only worth doing for fns that return in memory--and
16109 simpler, since we don't have to worry about promoted modes. */
16110 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl
)), fndecl
)
16111 /* Only allow this for variables declared in the outer scope of
16112 the function so we know that their lifetime always ends with a
16113 return; see g++.dg/opt/nrv6.C. We could be more flexible if
16114 we were to do this optimization in tree-ssa. */
16115 && (outer
= outer_curly_brace_block (fndecl
))
16116 && chain_member (r
, BLOCK_VARS (outer
)))
16117 finalize_nrv (&DECL_SAVED_TREE (fndecl
), r
, DECL_RESULT (fndecl
));
16119 current_function_return_value
= NULL_TREE
;
16122 /* Remember that we were in class scope. */
16123 if (current_class_name
)
16124 ctype
= current_class_type
;
16126 /* Must mark the RESULT_DECL as being in this function. */
16127 DECL_CONTEXT (DECL_RESULT (fndecl
)) = fndecl
;
16129 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
16130 to the FUNCTION_DECL node itself. */
16131 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl
)) = fndecl
;
16133 /* Save away current state, if appropriate. */
16134 if (!processing_template_decl
)
16135 save_function_data (fndecl
);
16137 /* Complain if there's just no return statement. */
16138 if (warn_return_type
16139 && !VOID_TYPE_P (TREE_TYPE (fntype
))
16140 && !dependent_type_p (TREE_TYPE (fntype
))
16141 && !current_function_returns_value
&& !current_function_returns_null
16142 /* Don't complain if we abort or throw. */
16143 && !current_function_returns_abnormally
16144 /* Don't complain if there's an infinite loop. */
16145 && !current_function_infinite_loop
16146 /* Don't complain if we are declared noreturn. */
16147 && !TREE_THIS_VOLATILE (fndecl
)
16148 && !DECL_NAME (DECL_RESULT (fndecl
))
16149 && !TREE_NO_WARNING (fndecl
)
16150 /* Structor return values (if any) are set by the compiler. */
16151 && !DECL_CONSTRUCTOR_P (fndecl
)
16152 && !DECL_DESTRUCTOR_P (fndecl
)
16153 && targetm
.warn_func_return (fndecl
))
16155 gcc_rich_location
richloc (input_location
);
16156 /* Potentially add a "return *this;" fix-it hint for
16157 assignment operators. */
16158 if (IDENTIFIER_ASSIGN_OP_P (DECL_NAME (fndecl
)))
16160 tree valtype
= TREE_TYPE (DECL_RESULT (fndecl
));
16161 if (TREE_CODE (valtype
) == REFERENCE_TYPE
16162 && current_class_ref
16163 && same_type_ignoring_top_level_qualifiers_p
16164 (TREE_TYPE (valtype
), TREE_TYPE (current_class_ref
))
16165 && global_dc
->option_enabled (OPT_Wreturn_type
,
16166 global_dc
->option_state
))
16167 add_return_star_this_fixit (&richloc
, fndecl
);
16169 warning_at (&richloc
, OPT_Wreturn_type
,
16170 "no return statement in function returning non-void");
16171 TREE_NO_WARNING (fndecl
) = 1;
16174 /* Store the end of the function, so that we get good line number
16175 info for the epilogue. */
16176 cfun
->function_end_locus
= input_location
;
16178 /* Complain about parameters that are only set, but never otherwise used. */
16179 if (warn_unused_but_set_parameter
16180 && !processing_template_decl
16181 && errorcount
== unused_but_set_errorcount
16182 && !DECL_CLONED_FUNCTION_P (fndecl
))
16186 for (decl
= DECL_ARGUMENTS (fndecl
);
16188 decl
= DECL_CHAIN (decl
))
16189 if (TREE_USED (decl
)
16190 && TREE_CODE (decl
) == PARM_DECL
16191 && !DECL_READ_P (decl
)
16192 && DECL_NAME (decl
)
16193 && !DECL_ARTIFICIAL (decl
)
16194 && !TREE_NO_WARNING (decl
)
16195 && !DECL_IN_SYSTEM_HEADER (decl
)
16196 && TREE_TYPE (decl
) != error_mark_node
16197 && !TYPE_REF_P (TREE_TYPE (decl
))
16198 && (!CLASS_TYPE_P (TREE_TYPE (decl
))
16199 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl
))))
16200 warning_at (DECL_SOURCE_LOCATION (decl
),
16201 OPT_Wunused_but_set_parameter
,
16202 "parameter %qD set but not used", decl
);
16203 unused_but_set_errorcount
= errorcount
;
16206 /* Complain about locally defined typedefs that are not used in this
16208 maybe_warn_unused_local_typedefs ();
16210 /* Possibly warn about unused parameters. */
16211 if (warn_unused_parameter
16212 && !processing_template_decl
16213 && !DECL_CLONED_FUNCTION_P (fndecl
))
16214 do_warn_unused_parameter (fndecl
);
16216 /* Genericize before inlining. */
16217 if (!processing_template_decl
)
16219 struct language_function
*f
= DECL_SAVED_FUNCTION_DATA (fndecl
);
16220 cp_genericize (fndecl
);
16221 /* Clear out the bits we don't need. */
16222 f
->x_current_class_ptr
= NULL
;
16223 f
->x_current_class_ref
= NULL
;
16224 f
->x_eh_spec_block
= NULL
;
16225 f
->x_in_charge_parm
= NULL
;
16226 f
->x_vtt_parm
= NULL
;
16227 f
->x_return_value
= NULL
;
16228 f
->bindings
= NULL
;
16229 f
->extern_decl_map
= NULL
;
16230 f
->infinite_loops
= NULL
;
16233 /* We're leaving the context of this function, so zap cfun. It's still in
16234 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
16236 current_function_decl
= NULL
;
16238 /* If this is an in-class inline definition, we may have to pop the
16239 bindings for the template parameters that we added in
16240 maybe_begin_member_template_processing when start_function was
16243 maybe_end_member_template_processing ();
16245 /* Leave the scope of the class. */
16247 pop_nested_class ();
16252 current_function_decl
= NULL_TREE
;
16254 invoke_plugin_callbacks (PLUGIN_FINISH_PARSE_FUNCTION
, fndecl
);
16258 /* Create the FUNCTION_DECL for a function definition.
16259 DECLSPECS and DECLARATOR are the parts of the declaration;
16260 they describe the return type and the name of the function,
16261 but twisted together in a fashion that parallels the syntax of C.
16263 This function creates a binding context for the function body
16264 as well as setting up the FUNCTION_DECL in current_function_decl.
16266 Returns a FUNCTION_DECL on success.
16268 If the DECLARATOR is not suitable for a function (it defines a datum
16269 instead), we return 0, which tells yyparse to report a parse error.
16271 May return void_type_node indicating that this method is actually
16272 a friend. See grokfield for more details.
16274 Came here with a `.pushlevel' .
16276 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
16277 CHANGES TO CODE IN `grokfield'. */
16280 grokmethod (cp_decl_specifier_seq
*declspecs
,
16281 const cp_declarator
*declarator
, tree attrlist
)
16283 tree fndecl
= grokdeclarator (declarator
, declspecs
, MEMFUNCDEF
, 0,
16286 if (fndecl
== error_mark_node
)
16287 return error_mark_node
;
16289 if (fndecl
== NULL
|| TREE_CODE (fndecl
) != FUNCTION_DECL
)
16291 error ("invalid member function declaration");
16292 return error_mark_node
;
16296 cplus_decl_attributes (&fndecl
, attrlist
, 0);
16298 /* Pass friends other than inline friend functions back. */
16299 if (fndecl
== void_type_node
)
16302 if (DECL_IN_AGGR_P (fndecl
))
16304 if (DECL_CLASS_SCOPE_P (fndecl
))
16305 error ("%qD is already defined in class %qT", fndecl
,
16306 DECL_CONTEXT (fndecl
));
16307 return error_mark_node
;
16310 check_template_shadow (fndecl
);
16312 if (TREE_PUBLIC (fndecl
))
16313 DECL_COMDAT (fndecl
) = 1;
16314 DECL_DECLARED_INLINE_P (fndecl
) = 1;
16315 DECL_NO_INLINE_WARNING_P (fndecl
) = 1;
16317 /* We process method specializations in finish_struct_1. */
16318 if (processing_template_decl
&& !DECL_TEMPLATE_SPECIALIZATION (fndecl
))
16320 fndecl
= push_template_decl (fndecl
);
16321 if (fndecl
== error_mark_node
)
16325 if (! DECL_FRIEND_P (fndecl
))
16327 if (DECL_CHAIN (fndecl
))
16329 fndecl
= copy_node (fndecl
);
16330 TREE_CHAIN (fndecl
) = NULL_TREE
;
16334 cp_finish_decl (fndecl
, NULL_TREE
, false, NULL_TREE
, 0);
16336 DECL_IN_AGGR_P (fndecl
) = 1;
16341 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
16342 we can lay it out later, when and if its type becomes complete.
16344 Also handle constexpr variables where the initializer involves
16345 an unlowered PTRMEM_CST because the class isn't complete yet. */
16348 maybe_register_incomplete_var (tree var
)
16350 gcc_assert (VAR_P (var
));
16352 /* Keep track of variables with incomplete types. */
16353 if (!processing_template_decl
&& TREE_TYPE (var
) != error_mark_node
16354 && DECL_EXTERNAL (var
))
16356 tree inner_type
= TREE_TYPE (var
);
16358 while (TREE_CODE (inner_type
) == ARRAY_TYPE
)
16359 inner_type
= TREE_TYPE (inner_type
);
16360 inner_type
= TYPE_MAIN_VARIANT (inner_type
);
16362 if ((!COMPLETE_TYPE_P (inner_type
) && CLASS_TYPE_P (inner_type
))
16363 /* RTTI TD entries are created while defining the type_info. */
16364 || (TYPE_LANG_SPECIFIC (inner_type
)
16365 && TYPE_BEING_DEFINED (inner_type
)))
16367 incomplete_var iv
= {var
, inner_type
};
16368 vec_safe_push (incomplete_vars
, iv
);
16370 else if (!(DECL_LANG_SPECIFIC (var
) && DECL_TEMPLATE_INFO (var
))
16371 && decl_constant_var_p (var
)
16372 && (TYPE_PTRMEM_P (inner_type
) || CLASS_TYPE_P (inner_type
)))
16374 /* When the outermost open class is complete we can resolve any
16375 pointers-to-members. */
16376 tree context
= outermost_open_class ();
16377 incomplete_var iv
= {var
, context
};
16378 vec_safe_push (incomplete_vars
, iv
);
16383 /* Called when a class type (given by TYPE) is defined. If there are
16384 any existing VAR_DECLs whose type has been completed by this
16385 declaration, update them now. */
16388 complete_vars (tree type
)
16391 incomplete_var
*iv
;
16393 for (ix
= 0; vec_safe_iterate (incomplete_vars
, ix
, &iv
); )
16395 if (same_type_p (type
, iv
->incomplete_type
))
16397 tree var
= iv
->decl
;
16398 tree type
= TREE_TYPE (var
);
16400 if (type
!= error_mark_node
16401 && (TYPE_MAIN_VARIANT (strip_array_types (type
))
16402 == iv
->incomplete_type
))
16404 /* Complete the type of the variable. The VAR_DECL itself
16405 will be laid out in expand_expr. */
16406 complete_type (type
);
16407 cp_apply_type_quals_to_decl (cp_type_quals (type
), var
);
16410 /* Remove this entry from the list. */
16411 incomplete_vars
->unordered_remove (ix
);
16417 /* Check for pending declarations which may have abstract type. */
16418 complete_type_check_abstract (type
);
16421 /* If DECL is of a type which needs a cleanup, build and return an
16422 expression to perform that cleanup here. Return NULL_TREE if no
16423 cleanup need be done. DECL can also be a _REF when called from
16424 split_nonconstant_init_1. */
16427 cxx_maybe_build_cleanup (tree decl
, tsubst_flags_t complain
)
16433 /* Assume no cleanup is required. */
16434 cleanup
= NULL_TREE
;
16436 if (error_operand_p (decl
))
16439 /* Handle "__attribute__((cleanup))". We run the cleanup function
16440 before the destructor since the destructor is what actually
16441 terminates the lifetime of the object. */
16443 attr
= lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl
));
16452 /* Get the name specified by the user for the cleanup function. */
16453 id
= TREE_VALUE (TREE_VALUE (attr
));
16454 /* Look up the name to find the cleanup function to call. It is
16455 important to use lookup_name here because that is what is
16456 used in c-common.c:handle_cleanup_attribute when performing
16457 initial checks on the attribute. Note that those checks
16458 include ensuring that the function found is not an overloaded
16459 function, or an object with an overloaded call operator,
16460 etc.; we can rely on the fact that the function found is an
16461 ordinary FUNCTION_DECL. */
16462 fn
= lookup_name (id
);
16463 arg
= build_address (decl
);
16464 if (!mark_used (decl
, complain
) && !(complain
& tf_error
))
16465 return error_mark_node
;
16466 cleanup
= cp_build_function_call_nary (fn
, complain
, arg
, NULL_TREE
);
16467 if (cleanup
== error_mark_node
)
16468 return error_mark_node
;
16470 /* Handle ordinary C++ destructors. */
16471 type
= TREE_TYPE (decl
);
16472 if (type_build_dtor_call (type
))
16474 int flags
= LOOKUP_NORMAL
|LOOKUP_NONVIRTUAL
|LOOKUP_DESTRUCTOR
;
16478 if (TREE_CODE (type
) == ARRAY_TYPE
)
16481 addr
= build_address (decl
);
16483 call
= build_delete (TREE_TYPE (addr
), addr
,
16484 sfk_complete_destructor
, flags
, 0, complain
);
16485 if (call
== error_mark_node
)
16486 cleanup
= error_mark_node
;
16487 else if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type
))
16488 /* Discard the call. */;
16490 cleanup
= cp_build_compound_expr (cleanup
, call
, complain
);
16495 /* build_delete sets the location of the destructor call to the
16496 current location, even though the destructor is going to be
16497 called later, at the end of the current scope. This can lead to
16498 a "jumpy" behavior for users of debuggers when they step around
16499 the end of the block. So let's unset the location of the
16500 destructor call instead. */
16501 protected_set_expr_location (cleanup
, UNKNOWN_LOCATION
);
16505 && !lookup_attribute ("warn_unused", TYPE_ATTRIBUTES (TREE_TYPE (decl
)))
16506 /* Treat objects with destructors as used; the destructor may do
16507 something substantive. */
16508 && !mark_used (decl
, complain
) && !(complain
& tf_error
))
16509 return error_mark_node
;
16515 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
16516 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
16517 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
16520 static_fn_type (tree memfntype
)
16525 if (TYPE_PTRMEMFUNC_P (memfntype
))
16526 memfntype
= TYPE_PTRMEMFUNC_FN_TYPE (memfntype
);
16527 if (INDIRECT_TYPE_P (memfntype
)
16528 || TREE_CODE (memfntype
) == FUNCTION_DECL
)
16529 memfntype
= TREE_TYPE (memfntype
);
16530 if (TREE_CODE (memfntype
) == FUNCTION_TYPE
)
16532 gcc_assert (TREE_CODE (memfntype
) == METHOD_TYPE
);
16533 args
= TYPE_ARG_TYPES (memfntype
);
16534 fntype
= build_function_type (TREE_TYPE (memfntype
), TREE_CHAIN (args
));
16535 fntype
= apply_memfn_quals (fntype
, type_memfn_quals (memfntype
));
16536 fntype
= (cp_build_type_attribute_variant
16537 (fntype
, TYPE_ATTRIBUTES (memfntype
)));
16538 fntype
= cxx_copy_lang_qualifiers (fntype
, memfntype
);
16542 /* DECL was originally constructed as a non-static member function,
16543 but turned out to be static. Update it accordingly. */
16546 revert_static_member_fn (tree decl
)
16548 tree stype
= static_fn_type (decl
);
16549 cp_cv_quals quals
= type_memfn_quals (stype
);
16550 cp_ref_qualifier rqual
= type_memfn_rqual (stype
);
16552 if (quals
!= TYPE_UNQUALIFIED
|| rqual
!= REF_QUAL_NONE
)
16553 stype
= apply_memfn_quals (stype
, TYPE_UNQUALIFIED
, REF_QUAL_NONE
);
16555 TREE_TYPE (decl
) = stype
;
16557 if (DECL_ARGUMENTS (decl
))
16558 DECL_ARGUMENTS (decl
) = DECL_CHAIN (DECL_ARGUMENTS (decl
));
16559 DECL_STATIC_FUNCTION_P (decl
) = 1;
16562 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
16563 one of the language-independent trees. */
16565 enum cp_tree_node_structure_enum
16566 cp_tree_node_structure (union lang_tree_node
* t
)
16568 switch (TREE_CODE (&t
->generic
))
16570 case DEFAULT_ARG
: return TS_CP_DEFAULT_ARG
;
16571 case DEFERRED_NOEXCEPT
: return TS_CP_DEFERRED_NOEXCEPT
;
16572 case IDENTIFIER_NODE
: return TS_CP_IDENTIFIER
;
16573 case OVERLOAD
: return TS_CP_OVERLOAD
;
16574 case TEMPLATE_PARM_INDEX
: return TS_CP_TPI
;
16575 case PTRMEM_CST
: return TS_CP_PTRMEM
;
16576 case BASELINK
: return TS_CP_BASELINK
;
16577 case TEMPLATE_DECL
: return TS_CP_TEMPLATE_DECL
;
16578 case STATIC_ASSERT
: return TS_CP_STATIC_ASSERT
;
16579 case ARGUMENT_PACK_SELECT
: return TS_CP_ARGUMENT_PACK_SELECT
;
16580 case TRAIT_EXPR
: return TS_CP_TRAIT_EXPR
;
16581 case LAMBDA_EXPR
: return TS_CP_LAMBDA_EXPR
;
16582 case TEMPLATE_INFO
: return TS_CP_TEMPLATE_INFO
;
16583 case CONSTRAINT_INFO
: return TS_CP_CONSTRAINT_INFO
;
16584 case USERDEF_LITERAL
: return TS_CP_USERDEF_LITERAL
;
16585 default: return TS_CP_GENERIC
;
16589 /* Build the void_list_node (void_type_node having been created). */
16591 build_void_list_node (void)
16593 tree t
= build_tree_list (NULL_TREE
, void_type_node
);
16598 cp_missing_noreturn_ok_p (tree decl
)
16600 /* A missing noreturn is ok for the `main' function. */
16601 return DECL_MAIN_P (decl
);
16604 /* Return the decl used to identify the COMDAT group into which DECL should
16608 cxx_comdat_group (tree decl
)
16610 /* Virtual tables, construction virtual tables, and virtual table
16611 tables all go in a single COMDAT group, named after the primary
16613 if (VAR_P (decl
) && DECL_VTABLE_OR_VTT_P (decl
))
16614 decl
= CLASSTYPE_VTABLES (DECL_CONTEXT (decl
));
16615 /* For all other DECLs, the COMDAT group is the mangled name of the
16616 declaration itself. */
16619 while (DECL_THUNK_P (decl
))
16621 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
16622 into the same section as the target function. In that case
16623 we must return target's name. */
16624 tree target
= THUNK_TARGET (decl
);
16625 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target
)
16626 && DECL_SECTION_NAME (target
) != NULL
16627 && DECL_ONE_ONLY (target
))
16637 /* Returns the return type for FN as written by the user, which may include
16638 a placeholder for a deduced return type. */
16641 fndecl_declared_return_type (tree fn
)
16643 fn
= STRIP_TEMPLATE (fn
);
16644 if (FNDECL_USED_AUTO (fn
))
16646 struct language_function
*f
= NULL
;
16647 if (DECL_STRUCT_FUNCTION (fn
))
16648 f
= DECL_STRUCT_FUNCTION (fn
)->language
;
16650 f
= DECL_SAVED_FUNCTION_DATA (fn
);
16651 return f
->x_auto_return_pattern
;
16653 return TREE_TYPE (TREE_TYPE (fn
));
16656 /* Returns true iff DECL is a variable or function declared with an auto type
16657 that has not yet been deduced to a real type. */
16660 undeduced_auto_decl (tree decl
)
16662 if (cxx_dialect
< cxx11
)
16664 STRIP_ANY_LOCATION_WRAPPER (decl
);
16665 return ((VAR_OR_FUNCTION_DECL_P (decl
)
16666 || TREE_CODE (decl
) == TEMPLATE_DECL
)
16667 && type_uses_auto (TREE_TYPE (decl
)));
16670 /* Complain if DECL has an undeduced return type. */
16673 require_deduced_type (tree decl
, tsubst_flags_t complain
)
16675 if (undeduced_auto_decl (decl
))
16677 if (complain
& tf_error
)
16678 error ("use of %qD before deduction of %<auto%>", decl
);
16684 /* Create a representation of the explicit-specifier with
16685 constant-expression of EXPR. COMPLAIN is as for tsubst. */
16688 build_explicit_specifier (tree expr
, tsubst_flags_t complain
)
16690 if (instantiation_dependent_expression_p (expr
))
16691 /* Wait for instantiation, tsubst_function_decl will handle it. */
16694 expr
= instantiate_non_dependent_expr_sfinae (expr
, complain
);
16695 /* Don't let convert_like_real create more template codes. */
16696 processing_template_decl_sentinel s
;
16697 expr
= build_converted_constant_expr (boolean_type_node
, expr
, complain
);
16698 expr
= cxx_constant_value (expr
);
16702 #include "gt-cp-decl.h"