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 copy_type_enum (tree
, tree
);
84 static void check_function_type (tree
, tree
);
85 static void finish_constructor_body (void);
86 static void begin_destructor_body (void);
87 static void finish_destructor_body (void);
88 static void record_key_method_defined (tree
);
89 static tree
create_array_type_for_decl (tree
, tree
, tree
, location_t
);
90 static tree
get_atexit_node (void);
91 static tree
get_dso_handle_node (void);
92 static tree
start_cleanup_fn (void);
93 static void end_cleanup_fn (void);
94 static tree
cp_make_fname_decl (location_t
, tree
, int);
95 static void initialize_predefined_identifiers (void);
96 static tree check_special_function_return_type
97 (special_function_kind
, tree
, tree
, int, const location_t
*);
98 static tree
push_cp_library_fn (enum tree_code
, tree
, int);
99 static tree
build_cp_library_fn (tree
, enum tree_code
, tree
, int);
100 static void store_parm_decls (tree
);
101 static void initialize_local_var (tree
, tree
);
102 static void expand_static_init (tree
, tree
);
103 static location_t
smallest_type_location (const cp_decl_specifier_seq
*);
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
)
1928 if (diagnose_mismatched_attributes (olddecl
, newdecl
))
1929 inform (olddecl_loc
, DECL_INITIAL (olddecl
)
1930 ? G_("previous definition of %qD here")
1931 : G_("previous declaration of %qD here"), olddecl
);
1933 /* [dcl.attr.noreturn]: The first declaration of a function shall
1934 specify the noreturn attribute if any declaration of that function
1935 specifies the noreturn attribute. */
1937 if (TREE_THIS_VOLATILE (newdecl
)
1938 && !TREE_THIS_VOLATILE (olddecl
)
1939 /* This applies to [[noreturn]] only, not its GNU variants. */
1940 && (a
= lookup_attribute ("noreturn", DECL_ATTRIBUTES (newdecl
)))
1941 && cxx11_attribute_p (a
)
1942 && get_attribute_namespace (a
) == NULL_TREE
)
1944 error_at (newdecl_loc
, "function %qD declared %<[[noreturn]]%> "
1945 "but its first declaration was not", newdecl
);
1946 inform (olddecl_loc
, "previous declaration of %qD", olddecl
);
1950 /* Now that functions must hold information normally held
1951 by field decls, there is extra work to do so that
1952 declaration information does not get destroyed during
1954 if (DECL_VINDEX (olddecl
))
1955 DECL_VINDEX (newdecl
) = DECL_VINDEX (olddecl
);
1956 if (DECL_CONTEXT (olddecl
))
1957 DECL_CONTEXT (newdecl
) = DECL_CONTEXT (olddecl
);
1958 DECL_STATIC_CONSTRUCTOR (newdecl
) |= DECL_STATIC_CONSTRUCTOR (olddecl
);
1959 DECL_STATIC_DESTRUCTOR (newdecl
) |= DECL_STATIC_DESTRUCTOR (olddecl
);
1960 DECL_PURE_VIRTUAL_P (newdecl
) |= DECL_PURE_VIRTUAL_P (olddecl
);
1961 DECL_VIRTUAL_P (newdecl
) |= DECL_VIRTUAL_P (olddecl
);
1962 DECL_INVALID_OVERRIDER_P (newdecl
) |= DECL_INVALID_OVERRIDER_P (olddecl
);
1963 DECL_FINAL_P (newdecl
) |= DECL_FINAL_P (olddecl
);
1964 DECL_OVERRIDE_P (newdecl
) |= DECL_OVERRIDE_P (olddecl
);
1965 DECL_THIS_STATIC (newdecl
) |= DECL_THIS_STATIC (olddecl
);
1966 if (DECL_OVERLOADED_OPERATOR_P (olddecl
))
1967 DECL_OVERLOADED_OPERATOR_CODE_RAW (newdecl
)
1968 = DECL_OVERLOADED_OPERATOR_CODE_RAW (olddecl
);
1969 new_defines_function
= DECL_INITIAL (newdecl
) != NULL_TREE
;
1971 /* Optionally warn about more than one declaration for the same
1972 name, but don't warn about a function declaration followed by a
1974 if (warn_redundant_decls
&& ! DECL_ARTIFICIAL (olddecl
)
1975 && !(new_defines_function
&& DECL_INITIAL (olddecl
) == NULL_TREE
)
1976 /* Don't warn about extern decl followed by definition. */
1977 && !(DECL_EXTERNAL (olddecl
) && ! DECL_EXTERNAL (newdecl
))
1978 /* Don't warn about friends, let add_friend take care of it. */
1979 && ! (newdecl_is_friend
|| DECL_FRIEND_P (olddecl
))
1980 /* Don't warn about declaration followed by specialization. */
1981 && (! DECL_TEMPLATE_SPECIALIZATION (newdecl
)
1982 || DECL_TEMPLATE_SPECIALIZATION (olddecl
)))
1984 auto_diagnostic_group d
;
1985 if (warning_at (newdecl_loc
,
1986 OPT_Wredundant_decls
,
1987 "redundant redeclaration of %qD in same scope",
1989 inform (olddecl_loc
,
1990 "previous declaration of %qD", olddecl
);
1993 if (!(DECL_TEMPLATE_INSTANTIATION (olddecl
)
1994 && DECL_TEMPLATE_SPECIALIZATION (newdecl
)))
1996 if (DECL_DELETED_FN (newdecl
))
1998 auto_diagnostic_group d
;
1999 error_at (newdecl_loc
, "deleted definition of %qD", newdecl
);
2000 inform (olddecl_loc
,
2001 "previous declaration of %qD", olddecl
);
2003 DECL_DELETED_FN (newdecl
) |= DECL_DELETED_FN (olddecl
);
2007 /* Deal with C++: must preserve virtual function table size. */
2008 if (TREE_CODE (olddecl
) == TYPE_DECL
)
2010 tree newtype
= TREE_TYPE (newdecl
);
2011 tree oldtype
= TREE_TYPE (olddecl
);
2013 if (newtype
!= error_mark_node
&& oldtype
!= error_mark_node
2014 && TYPE_LANG_SPECIFIC (newtype
) && TYPE_LANG_SPECIFIC (oldtype
))
2015 CLASSTYPE_FRIEND_CLASSES (newtype
)
2016 = CLASSTYPE_FRIEND_CLASSES (oldtype
);
2018 DECL_ORIGINAL_TYPE (newdecl
) = DECL_ORIGINAL_TYPE (olddecl
);
2021 /* Copy all the DECL_... slots specified in the new decl except for
2022 any that we copy here from the old type. */
2024 DECL_ATTRIBUTES (newdecl
)
2025 = (*targetm
.merge_decl_attributes
) (olddecl
, newdecl
);
2027 DECL_ATTRIBUTES (olddecl
) = DECL_ATTRIBUTES (newdecl
);
2029 if (DECL_DECLARES_FUNCTION_P (olddecl
))
2031 olddecl_friend
= DECL_FRIEND_P (olddecl
);
2032 olddecl_hidden_friend
= DECL_HIDDEN_FRIEND_P (olddecl
);
2033 hidden_friend
= (DECL_ANTICIPATED (olddecl
)
2034 && DECL_HIDDEN_FRIEND_P (olddecl
)
2035 && newdecl_is_friend
);
2038 DECL_ANTICIPATED (olddecl
) = 0;
2039 DECL_HIDDEN_FRIEND_P (olddecl
) = 0;
2043 if (TREE_CODE (newdecl
) == TEMPLATE_DECL
)
2045 tree old_result
= DECL_TEMPLATE_RESULT (olddecl
);
2046 tree new_result
= DECL_TEMPLATE_RESULT (newdecl
);
2047 TREE_TYPE (olddecl
) = TREE_TYPE (old_result
);
2049 /* The new decl should not already have gathered any
2051 gcc_assert (!DECL_TEMPLATE_SPECIALIZATIONS (newdecl
));
2053 DECL_ATTRIBUTES (old_result
)
2054 = (*targetm
.merge_decl_attributes
) (old_result
, new_result
);
2056 if (DECL_FUNCTION_TEMPLATE_P (newdecl
))
2058 if (DECL_SOURCE_LOCATION (newdecl
)
2059 != DECL_SOURCE_LOCATION (olddecl
))
2061 /* Per C++11 8.3.6/4, default arguments cannot be added in
2062 later declarations of a function template. */
2063 check_redeclaration_no_default_args (newdecl
);
2064 /* C++17 11.3.6/4: "If a friend declaration specifies a default
2065 argument expression, that declaration... shall be the only
2066 declaration of the function or function template in the
2067 translation unit." */
2068 check_no_redeclaration_friend_default_args
2069 (old_result
, new_result
, olddecl_hidden_friend
);
2072 check_default_args (newdecl
);
2074 if (GNU_INLINE_P (old_result
) != GNU_INLINE_P (new_result
)
2075 && DECL_INITIAL (new_result
))
2077 if (DECL_INITIAL (old_result
))
2078 DECL_UNINLINABLE (old_result
) = 1;
2080 DECL_UNINLINABLE (old_result
) = DECL_UNINLINABLE (new_result
);
2081 DECL_EXTERNAL (old_result
) = DECL_EXTERNAL (new_result
);
2082 DECL_NOT_REALLY_EXTERN (old_result
)
2083 = DECL_NOT_REALLY_EXTERN (new_result
);
2084 DECL_INTERFACE_KNOWN (old_result
)
2085 = DECL_INTERFACE_KNOWN (new_result
);
2086 DECL_DECLARED_INLINE_P (old_result
)
2087 = DECL_DECLARED_INLINE_P (new_result
);
2088 DECL_DISREGARD_INLINE_LIMITS (old_result
)
2089 |= DECL_DISREGARD_INLINE_LIMITS (new_result
);
2094 DECL_DECLARED_INLINE_P (old_result
)
2095 |= DECL_DECLARED_INLINE_P (new_result
);
2096 DECL_DISREGARD_INLINE_LIMITS (old_result
)
2097 |= DECL_DISREGARD_INLINE_LIMITS (new_result
);
2098 check_redeclaration_exception_specification (newdecl
, olddecl
);
2100 merge_attribute_bits (new_result
, old_result
);
2104 /* If the new declaration is a definition, update the file and
2105 line information on the declaration, and also make
2106 the old declaration the same definition. */
2107 if (DECL_INITIAL (new_result
) != NULL_TREE
)
2109 DECL_SOURCE_LOCATION (olddecl
)
2110 = DECL_SOURCE_LOCATION (old_result
)
2111 = DECL_SOURCE_LOCATION (newdecl
);
2112 DECL_INITIAL (old_result
) = DECL_INITIAL (new_result
);
2113 if (DECL_FUNCTION_TEMPLATE_P (newdecl
))
2116 DECL_ARGUMENTS (old_result
)
2117 = DECL_ARGUMENTS (new_result
);
2118 for (parm
= DECL_ARGUMENTS (old_result
); parm
;
2119 parm
= DECL_CHAIN (parm
))
2120 DECL_CONTEXT (parm
) = old_result
;
2129 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2130 check_redeclaration_exception_specification (newdecl
, olddecl
);
2132 /* Automatically handles default parameters. */
2133 tree oldtype
= TREE_TYPE (olddecl
);
2136 /* For typedefs use the old type, as the new type's DECL_NAME points
2137 at newdecl, which will be ggc_freed. */
2138 if (TREE_CODE (newdecl
) == TYPE_DECL
)
2140 /* But NEWTYPE might have an attribute, honor that. */
2141 tree tem
= TREE_TYPE (newdecl
);
2144 if (TYPE_USER_ALIGN (tem
))
2146 if (TYPE_ALIGN (tem
) > TYPE_ALIGN (newtype
))
2147 SET_TYPE_ALIGN (newtype
, TYPE_ALIGN (tem
));
2148 TYPE_USER_ALIGN (newtype
) = true;
2151 /* And remove the new type from the variants list. */
2152 if (TYPE_NAME (TREE_TYPE (newdecl
)) == newdecl
)
2154 tree remove
= TREE_TYPE (newdecl
);
2155 if (TYPE_MAIN_VARIANT (remove
) == remove
)
2157 gcc_assert (TYPE_NEXT_VARIANT (remove
) == NULL_TREE
);
2158 /* If remove is the main variant, no need to remove that
2159 from the list. One of the DECL_ORIGINAL_TYPE
2160 variants, e.g. created for aligned attribute, might still
2161 refer to the newdecl TYPE_DECL though, so remove that one
2163 if (tree orig
= DECL_ORIGINAL_TYPE (newdecl
))
2165 for (tree t
= TYPE_MAIN_VARIANT (orig
); t
;
2166 t
= TYPE_MAIN_VARIANT (t
))
2167 if (TYPE_NAME (TYPE_NEXT_VARIANT (t
)) == newdecl
)
2169 TYPE_NEXT_VARIANT (t
)
2170 = TYPE_NEXT_VARIANT (TYPE_NEXT_VARIANT (t
));
2175 for (tree t
= TYPE_MAIN_VARIANT (remove
); ;
2176 t
= TYPE_NEXT_VARIANT (t
))
2177 if (TYPE_NEXT_VARIANT (t
) == remove
)
2179 TYPE_NEXT_VARIANT (t
) = TYPE_NEXT_VARIANT (remove
);
2184 else if (merge_attr
)
2185 newtype
= merge_types (TREE_TYPE (newdecl
), TREE_TYPE (olddecl
));
2187 newtype
= TREE_TYPE (newdecl
);
2189 if (VAR_P (newdecl
))
2191 DECL_THIS_EXTERN (newdecl
) |= DECL_THIS_EXTERN (olddecl
);
2192 /* For already initialized vars, TREE_READONLY could have been
2193 cleared in cp_finish_decl, because the var needs runtime
2194 initialization or destruction. Make sure not to set
2195 TREE_READONLY on it again. */
2196 if (DECL_INITIALIZED_P (olddecl
)
2197 && !DECL_EXTERNAL (olddecl
)
2198 && !TREE_READONLY (olddecl
))
2199 TREE_READONLY (newdecl
) = 0;
2200 DECL_INITIALIZED_P (newdecl
) |= DECL_INITIALIZED_P (olddecl
);
2201 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl
)
2202 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl
);
2203 if (DECL_DEPENDENT_INIT_P (olddecl
))
2204 SET_DECL_DEPENDENT_INIT_P (newdecl
, true);
2205 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl
)
2206 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl
);
2207 DECL_DECLARED_CONSTEXPR_P (newdecl
)
2208 |= DECL_DECLARED_CONSTEXPR_P (olddecl
);
2210 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
2211 if (DECL_LANG_SPECIFIC (olddecl
)
2212 && CP_DECL_THREADPRIVATE_P (olddecl
))
2214 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
2215 retrofit_lang_decl (newdecl
);
2216 CP_DECL_THREADPRIVATE_P (newdecl
) = 1;
2220 /* An explicit specialization of a function template or of a member
2221 function of a class template can be declared transaction_safe
2222 independently of whether the corresponding template entity is declared
2223 transaction_safe. */
2224 if (flag_tm
&& TREE_CODE (newdecl
) == FUNCTION_DECL
2225 && DECL_TEMPLATE_INSTANTIATION (olddecl
)
2226 && DECL_TEMPLATE_SPECIALIZATION (newdecl
)
2227 && tx_safe_fn_type_p (newtype
)
2228 && !tx_safe_fn_type_p (TREE_TYPE (newdecl
)))
2229 newtype
= tx_unsafe_fn_variant (newtype
);
2231 TREE_TYPE (newdecl
) = TREE_TYPE (olddecl
) = newtype
;
2233 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2234 check_default_args (newdecl
);
2236 /* Lay the type out, unless already done. */
2237 if (! same_type_p (newtype
, oldtype
)
2238 && TREE_TYPE (newdecl
) != error_mark_node
2239 && !(processing_template_decl
&& uses_template_parms (newdecl
)))
2240 layout_type (TREE_TYPE (newdecl
));
2242 if ((VAR_P (newdecl
)
2243 || TREE_CODE (newdecl
) == PARM_DECL
2244 || TREE_CODE (newdecl
) == RESULT_DECL
2245 || TREE_CODE (newdecl
) == FIELD_DECL
2246 || TREE_CODE (newdecl
) == TYPE_DECL
)
2247 && !(processing_template_decl
&& uses_template_parms (newdecl
)))
2248 layout_decl (newdecl
, 0);
2250 /* Merge deprecatedness. */
2251 if (TREE_DEPRECATED (newdecl
))
2252 TREE_DEPRECATED (olddecl
) = 1;
2254 /* Preserve function specific target and optimization options */
2255 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2257 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl
)
2258 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl
))
2259 DECL_FUNCTION_SPECIFIC_TARGET (newdecl
)
2260 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl
);
2262 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
)
2263 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
))
2264 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
)
2265 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
);
2269 /* Merge the const type qualifier. */
2270 if (TREE_READONLY (newdecl
))
2271 TREE_READONLY (olddecl
) = 1;
2272 /* Merge the volatile type qualifier. */
2273 if (TREE_THIS_VOLATILE (newdecl
))
2274 TREE_THIS_VOLATILE (olddecl
) = 1;
2277 /* Merge the initialization information. */
2278 if (DECL_INITIAL (newdecl
) == NULL_TREE
2279 && DECL_INITIAL (olddecl
) != NULL_TREE
)
2281 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
2282 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
2283 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2285 DECL_SAVED_TREE (newdecl
) = DECL_SAVED_TREE (olddecl
);
2286 DECL_STRUCT_FUNCTION (newdecl
) = DECL_STRUCT_FUNCTION (olddecl
);
2290 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2292 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl
)
2293 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl
);
2294 DECL_NO_LIMIT_STACK (newdecl
) |= DECL_NO_LIMIT_STACK (olddecl
);
2295 if (DECL_IS_OPERATOR_NEW_P (olddecl
))
2296 DECL_SET_IS_OPERATOR_NEW (newdecl
, true);
2297 DECL_LOOPING_CONST_OR_PURE_P (newdecl
)
2298 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl
);
2301 merge_attribute_bits (newdecl
, olddecl
);
2304 /* Merge the noreturn bit. */
2305 TREE_THIS_VOLATILE (olddecl
) = TREE_THIS_VOLATILE (newdecl
);
2306 TREE_READONLY (olddecl
) = TREE_READONLY (newdecl
);
2307 TREE_NOTHROW (olddecl
) = TREE_NOTHROW (newdecl
);
2308 DECL_IS_MALLOC (olddecl
) = DECL_IS_MALLOC (newdecl
);
2309 DECL_PURE_P (olddecl
) = DECL_PURE_P (newdecl
);
2311 /* Keep the old RTL. */
2312 COPY_DECL_RTL (olddecl
, newdecl
);
2314 else if (VAR_P (newdecl
)
2315 && (DECL_SIZE (olddecl
) || !DECL_SIZE (newdecl
)))
2317 /* Keep the old RTL. We cannot keep the old RTL if the old
2318 declaration was for an incomplete object and the new
2319 declaration is not since many attributes of the RTL will
2321 COPY_DECL_RTL (olddecl
, newdecl
);
2324 /* If cannot merge, then use the new type and qualifiers,
2325 and don't preserve the old rtl. */
2328 /* Clean out any memory we had of the old declaration. */
2329 tree oldstatic
= value_member (olddecl
, static_aggregates
);
2331 TREE_VALUE (oldstatic
) = error_mark_node
;
2333 TREE_TYPE (olddecl
) = TREE_TYPE (newdecl
);
2334 TREE_READONLY (olddecl
) = TREE_READONLY (newdecl
);
2335 TREE_THIS_VOLATILE (olddecl
) = TREE_THIS_VOLATILE (newdecl
);
2336 TREE_NOTHROW (olddecl
) = TREE_NOTHROW (newdecl
);
2337 TREE_SIDE_EFFECTS (olddecl
) = TREE_SIDE_EFFECTS (newdecl
);
2340 /* Merge the storage class information. */
2341 merge_weak (newdecl
, olddecl
);
2343 DECL_DEFER_OUTPUT (newdecl
) |= DECL_DEFER_OUTPUT (olddecl
);
2344 TREE_PUBLIC (newdecl
) = TREE_PUBLIC (olddecl
);
2345 TREE_STATIC (olddecl
) = TREE_STATIC (newdecl
) |= TREE_STATIC (olddecl
);
2346 if (! DECL_EXTERNAL (olddecl
))
2347 DECL_EXTERNAL (newdecl
) = 0;
2348 if (! DECL_COMDAT (olddecl
))
2349 DECL_COMDAT (newdecl
) = 0;
2351 new_template_info
= NULL_TREE
;
2352 if (DECL_LANG_SPECIFIC (newdecl
) && DECL_LANG_SPECIFIC (olddecl
))
2354 bool new_redefines_gnu_inline
= false;
2356 if (new_defines_function
2357 && ((DECL_INTERFACE_KNOWN (olddecl
)
2358 && TREE_CODE (olddecl
) == FUNCTION_DECL
)
2359 || (TREE_CODE (olddecl
) == TEMPLATE_DECL
2360 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl
))
2361 == FUNCTION_DECL
))))
2365 if (TREE_CODE (fn
) == TEMPLATE_DECL
)
2366 fn
= DECL_TEMPLATE_RESULT (olddecl
);
2368 new_redefines_gnu_inline
= GNU_INLINE_P (fn
) && DECL_INITIAL (fn
);
2371 if (!new_redefines_gnu_inline
)
2373 DECL_INTERFACE_KNOWN (newdecl
) |= DECL_INTERFACE_KNOWN (olddecl
);
2374 DECL_NOT_REALLY_EXTERN (newdecl
) |= DECL_NOT_REALLY_EXTERN (olddecl
);
2375 DECL_COMDAT (newdecl
) |= DECL_COMDAT (olddecl
);
2377 DECL_TEMPLATE_INSTANTIATED (newdecl
)
2378 |= DECL_TEMPLATE_INSTANTIATED (olddecl
);
2379 DECL_ODR_USED (newdecl
) |= DECL_ODR_USED (olddecl
);
2381 /* If the OLDDECL is an instantiation and/or specialization,
2382 then the NEWDECL must be too. But, it may not yet be marked
2383 as such if the caller has created NEWDECL, but has not yet
2384 figured out that it is a redeclaration. */
2385 if (!DECL_USE_TEMPLATE (newdecl
))
2386 DECL_USE_TEMPLATE (newdecl
) = DECL_USE_TEMPLATE (olddecl
);
2388 /* Don't really know how much of the language-specific
2389 values we should copy from old to new. */
2390 DECL_IN_AGGR_P (newdecl
) = DECL_IN_AGGR_P (olddecl
);
2391 DECL_INITIALIZED_IN_CLASS_P (newdecl
)
2392 |= DECL_INITIALIZED_IN_CLASS_P (olddecl
);
2394 if (LANG_DECL_HAS_MIN (newdecl
))
2396 DECL_ACCESS (newdecl
) = DECL_ACCESS (olddecl
);
2397 if (DECL_TEMPLATE_INFO (newdecl
))
2399 new_template_info
= DECL_TEMPLATE_INFO (newdecl
);
2400 if (DECL_TEMPLATE_INSTANTIATION (olddecl
)
2401 && DECL_TEMPLATE_SPECIALIZATION (newdecl
))
2402 /* Remember the presence of explicit specialization args. */
2403 TINFO_USED_TEMPLATE_ID (DECL_TEMPLATE_INFO (olddecl
))
2404 = TINFO_USED_TEMPLATE_ID (new_template_info
);
2406 DECL_TEMPLATE_INFO (newdecl
) = DECL_TEMPLATE_INFO (olddecl
);
2409 if (DECL_DECLARES_FUNCTION_P (newdecl
))
2411 /* Only functions have these fields. */
2412 DECL_NONCONVERTING_P (newdecl
) = DECL_NONCONVERTING_P (olddecl
);
2413 DECL_BEFRIENDING_CLASSES (newdecl
)
2414 = chainon (DECL_BEFRIENDING_CLASSES (newdecl
),
2415 DECL_BEFRIENDING_CLASSES (olddecl
));
2416 /* DECL_THUNKS is only valid for virtual functions,
2417 otherwise it is a DECL_FRIEND_CONTEXT. */
2418 if (DECL_VIRTUAL_P (newdecl
))
2419 SET_DECL_THUNKS (newdecl
, DECL_THUNKS (olddecl
));
2421 else if (VAR_P (newdecl
))
2423 /* Only variables have this field. */
2424 if (VAR_HAD_UNKNOWN_BOUND (olddecl
))
2425 SET_VAR_HAD_UNKNOWN_BOUND (newdecl
);
2429 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2433 /* Merge parameter attributes. */
2434 tree oldarg
, newarg
;
2435 for (oldarg
= DECL_ARGUMENTS(olddecl
), newarg
= DECL_ARGUMENTS(newdecl
);
2437 oldarg
= DECL_CHAIN(oldarg
), newarg
= DECL_CHAIN(newarg
))
2439 DECL_ATTRIBUTES (newarg
)
2440 = (*targetm
.merge_decl_attributes
) (oldarg
, newarg
);
2441 DECL_ATTRIBUTES (oldarg
) = DECL_ATTRIBUTES (newarg
);
2444 if (DECL_TEMPLATE_INSTANTIATION (olddecl
)
2445 && !DECL_TEMPLATE_INSTANTIATION (newdecl
))
2447 /* If newdecl is not a specialization, then it is not a
2448 template-related function at all. And that means that we
2449 should have exited above, returning 0. */
2450 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl
));
2452 if (DECL_ODR_USED (olddecl
))
2453 /* From [temp.expl.spec]:
2455 If a template, a member template or the member of a class
2456 template is explicitly specialized then that
2457 specialization shall be declared before the first use of
2458 that specialization that would cause an implicit
2459 instantiation to take place, in every translation unit in
2460 which such a use occurs. */
2461 error ("explicit specialization of %qD after first use",
2464 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl
);
2465 DECL_COMDAT (newdecl
) = (TREE_PUBLIC (newdecl
)
2466 && DECL_DECLARED_INLINE_P (newdecl
));
2468 /* Don't propagate visibility from the template to the
2469 specialization here. We'll do that in determine_visibility if
2471 DECL_VISIBILITY_SPECIFIED (olddecl
) = 0;
2473 /* [temp.expl.spec/14] We don't inline explicit specialization
2474 just because the primary template says so. */
2475 gcc_assert (!merge_attr
);
2477 DECL_DECLARED_INLINE_P (olddecl
)
2478 = DECL_DECLARED_INLINE_P (newdecl
);
2480 DECL_DISREGARD_INLINE_LIMITS (olddecl
)
2481 = DECL_DISREGARD_INLINE_LIMITS (newdecl
);
2483 DECL_UNINLINABLE (olddecl
) = DECL_UNINLINABLE (newdecl
);
2485 else if (new_defines_function
&& DECL_INITIAL (olddecl
))
2487 /* Never inline re-defined extern inline functions.
2488 FIXME: this could be better handled by keeping both
2489 function as separate declarations. */
2490 DECL_UNINLINABLE (newdecl
) = 1;
2494 if (DECL_PENDING_INLINE_P (olddecl
))
2496 DECL_PENDING_INLINE_P (newdecl
) = 1;
2497 DECL_PENDING_INLINE_INFO (newdecl
)
2498 = DECL_PENDING_INLINE_INFO (olddecl
);
2500 else if (DECL_PENDING_INLINE_P (newdecl
))
2502 else if (DECL_SAVED_AUTO_RETURN_TYPE (newdecl
) == NULL
)
2503 DECL_SAVED_AUTO_RETURN_TYPE (newdecl
)
2504 = DECL_SAVED_AUTO_RETURN_TYPE (olddecl
);
2506 DECL_DECLARED_INLINE_P (newdecl
) |= DECL_DECLARED_INLINE_P (olddecl
);
2508 DECL_UNINLINABLE (newdecl
) = DECL_UNINLINABLE (olddecl
)
2509 = (DECL_UNINLINABLE (newdecl
) || DECL_UNINLINABLE (olddecl
));
2511 DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2512 = DECL_DISREGARD_INLINE_LIMITS (olddecl
)
2513 = (DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2514 || DECL_DISREGARD_INLINE_LIMITS (olddecl
));
2517 /* Preserve abstractness on cloned [cd]tors. */
2518 DECL_ABSTRACT_P (newdecl
) = DECL_ABSTRACT_P (olddecl
);
2520 /* Update newdecl's parms to point at olddecl. */
2521 for (parm
= DECL_ARGUMENTS (newdecl
); parm
;
2522 parm
= DECL_CHAIN (parm
))
2523 DECL_CONTEXT (parm
) = olddecl
;
2527 SET_DECL_LANGUAGE (olddecl
, DECL_LANGUAGE (newdecl
));
2528 COPY_DECL_ASSEMBLER_NAME (newdecl
, olddecl
);
2529 COPY_DECL_RTL (newdecl
, olddecl
);
2531 if (! types_match
|| new_defines_function
)
2533 /* These need to be copied so that the names are available.
2534 Note that if the types do match, we'll preserve inline
2535 info and other bits, but if not, we won't. */
2536 DECL_ARGUMENTS (olddecl
) = DECL_ARGUMENTS (newdecl
);
2537 DECL_RESULT (olddecl
) = DECL_RESULT (newdecl
);
2539 /* If redeclaring a builtin function, it stays built in
2540 if newdecl is a gnu_inline definition, or if newdecl is just
2542 if (fndecl_built_in_p (olddecl
)
2543 && (new_defines_function
? GNU_INLINE_P (newdecl
) : types_match
))
2545 copy_decl_built_in_function (newdecl
, olddecl
);
2546 /* If we're keeping the built-in definition, keep the rtl,
2547 regardless of declaration matches. */
2548 COPY_DECL_RTL (olddecl
, newdecl
);
2549 if (DECL_BUILT_IN_CLASS (newdecl
) == BUILT_IN_NORMAL
)
2551 enum built_in_function fncode
= DECL_FUNCTION_CODE (newdecl
);
2554 /* If a compatible prototype of these builtin functions
2555 is seen, assume the runtime implements it with the
2556 expected semantics. */
2557 case BUILT_IN_STPCPY
:
2558 if (builtin_decl_explicit_p (fncode
))
2559 set_builtin_decl_implicit_p (fncode
, true);
2562 if (builtin_decl_explicit_p (fncode
))
2563 set_builtin_decl_declared_p (fncode
, true);
2567 copy_attributes_to_builtin (newdecl
);
2570 if (new_defines_function
)
2571 /* If defining a function declared with other language
2572 linkage, use the previously declared language linkage. */
2573 SET_DECL_LANGUAGE (newdecl
, DECL_LANGUAGE (olddecl
));
2574 else if (types_match
)
2576 DECL_RESULT (newdecl
) = DECL_RESULT (olddecl
);
2577 /* Don't clear out the arguments if we're just redeclaring a
2579 if (DECL_ARGUMENTS (olddecl
))
2580 DECL_ARGUMENTS (newdecl
) = DECL_ARGUMENTS (olddecl
);
2583 else if (TREE_CODE (newdecl
) == NAMESPACE_DECL
)
2584 NAMESPACE_LEVEL (newdecl
) = NAMESPACE_LEVEL (olddecl
);
2586 /* Now preserve various other info from the definition. */
2587 TREE_ADDRESSABLE (newdecl
) = TREE_ADDRESSABLE (olddecl
);
2588 TREE_ASM_WRITTEN (newdecl
) = TREE_ASM_WRITTEN (olddecl
);
2589 DECL_COMMON (newdecl
) = DECL_COMMON (olddecl
);
2590 COPY_DECL_ASSEMBLER_NAME (olddecl
, newdecl
);
2592 /* Warn about conflicting visibility specifications. */
2593 if (DECL_VISIBILITY_SPECIFIED (olddecl
)
2594 && DECL_VISIBILITY_SPECIFIED (newdecl
)
2595 && DECL_VISIBILITY (newdecl
) != DECL_VISIBILITY (olddecl
))
2597 auto_diagnostic_group d
;
2598 if (warning_at (newdecl_loc
, OPT_Wattributes
,
2599 "%qD: visibility attribute ignored because it "
2600 "conflicts with previous declaration", newdecl
))
2601 inform (olddecl_loc
,
2602 "previous declaration of %qD", olddecl
);
2604 /* Choose the declaration which specified visibility. */
2605 if (DECL_VISIBILITY_SPECIFIED (olddecl
))
2607 DECL_VISIBILITY (newdecl
) = DECL_VISIBILITY (olddecl
);
2608 DECL_VISIBILITY_SPECIFIED (newdecl
) = 1;
2610 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2611 so keep this behavior. */
2612 if (VAR_P (newdecl
) && DECL_HAS_INIT_PRIORITY_P (newdecl
))
2614 SET_DECL_INIT_PRIORITY (olddecl
, DECL_INIT_PRIORITY (newdecl
));
2615 DECL_HAS_INIT_PRIORITY_P (olddecl
) = 1;
2617 /* Likewise for DECL_ALIGN, DECL_USER_ALIGN and DECL_PACKED. */
2618 if (DECL_ALIGN (olddecl
) > DECL_ALIGN (newdecl
))
2620 SET_DECL_ALIGN (newdecl
, DECL_ALIGN (olddecl
));
2621 DECL_USER_ALIGN (newdecl
) |= DECL_USER_ALIGN (olddecl
);
2623 DECL_USER_ALIGN (olddecl
) = DECL_USER_ALIGN (newdecl
);
2624 if (DECL_WARN_IF_NOT_ALIGN (olddecl
)
2625 > DECL_WARN_IF_NOT_ALIGN (newdecl
))
2626 SET_DECL_WARN_IF_NOT_ALIGN (newdecl
,
2627 DECL_WARN_IF_NOT_ALIGN (olddecl
));
2628 if (TREE_CODE (newdecl
) == FIELD_DECL
)
2629 DECL_PACKED (olddecl
) = DECL_PACKED (newdecl
);
2631 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2632 with that from NEWDECL below. */
2633 if (DECL_LANG_SPECIFIC (olddecl
))
2635 gcc_assert (DECL_LANG_SPECIFIC (olddecl
)
2636 != DECL_LANG_SPECIFIC (newdecl
));
2637 ggc_free (DECL_LANG_SPECIFIC (olddecl
));
2640 /* Merge the USED information. */
2641 if (TREE_USED (olddecl
))
2642 TREE_USED (newdecl
) = 1;
2643 else if (TREE_USED (newdecl
))
2644 TREE_USED (olddecl
) = 1;
2645 if (VAR_P (newdecl
))
2647 if (DECL_READ_P (olddecl
))
2648 DECL_READ_P (newdecl
) = 1;
2649 else if (DECL_READ_P (newdecl
))
2650 DECL_READ_P (olddecl
) = 1;
2652 if (DECL_PRESERVE_P (olddecl
))
2653 DECL_PRESERVE_P (newdecl
) = 1;
2654 else if (DECL_PRESERVE_P (newdecl
))
2655 DECL_PRESERVE_P (olddecl
) = 1;
2657 /* Merge the DECL_FUNCTION_VERSIONED information. newdecl will be copied
2658 to olddecl and deleted. */
2659 if (TREE_CODE (newdecl
) == FUNCTION_DECL
2660 && DECL_FUNCTION_VERSIONED (olddecl
))
2662 /* Set the flag for newdecl so that it gets copied to olddecl. */
2663 DECL_FUNCTION_VERSIONED (newdecl
) = 1;
2664 /* newdecl will be purged after copying to olddecl and is no longer
2666 cgraph_node::delete_function_version_by_decl (newdecl
);
2669 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2672 struct symtab_node
*snode
= symtab_node::get (olddecl
);
2674 function_size
= sizeof (struct tree_decl_common
);
2676 memcpy ((char *) olddecl
+ sizeof (struct tree_common
),
2677 (char *) newdecl
+ sizeof (struct tree_common
),
2678 function_size
- sizeof (struct tree_common
));
2680 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2681 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2682 sizeof (struct tree_function_decl
) - sizeof (struct tree_decl_common
));
2684 /* Preserve symtab node mapping. */
2685 olddecl
->decl_with_vis
.symtab_node
= snode
;
2687 if (new_template_info
)
2688 /* If newdecl is a template instantiation, it is possible that
2689 the following sequence of events has occurred:
2691 o A friend function was declared in a class template. The
2692 class template was instantiated.
2694 o The instantiation of the friend declaration was
2695 recorded on the instantiation list, and is newdecl.
2697 o Later, however, instantiate_class_template called pushdecl
2698 on the newdecl to perform name injection. But, pushdecl in
2699 turn called duplicate_decls when it discovered that another
2700 declaration of a global function with the same name already
2703 o Here, in duplicate_decls, we decided to clobber newdecl.
2705 If we're going to do that, we'd better make sure that
2706 olddecl, and not newdecl, is on the list of
2707 instantiations so that if we try to do the instantiation
2708 again we won't get the clobbered declaration. */
2709 reregister_specialization (newdecl
,
2715 size_t size
= tree_code_size (TREE_CODE (newdecl
));
2717 memcpy ((char *) olddecl
+ sizeof (struct tree_common
),
2718 (char *) newdecl
+ sizeof (struct tree_common
),
2719 sizeof (struct tree_decl_common
) - sizeof (struct tree_common
));
2720 switch (TREE_CODE (newdecl
))
2730 struct symtab_node
*snode
= NULL
;
2733 && (TREE_STATIC (olddecl
) || TREE_PUBLIC (olddecl
)
2734 || DECL_EXTERNAL (olddecl
)))
2735 snode
= symtab_node::get (olddecl
);
2736 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2737 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2738 size
- sizeof (struct tree_decl_common
)
2739 + TREE_CODE_LENGTH (TREE_CODE (newdecl
)) * sizeof (char *));
2740 if (VAR_P (newdecl
))
2741 olddecl
->decl_with_vis
.symtab_node
= snode
;
2745 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2746 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2747 sizeof (struct tree_decl_non_common
) - sizeof (struct tree_decl_common
)
2748 + TREE_CODE_LENGTH (TREE_CODE (newdecl
)) * sizeof (char *));
2753 if (VAR_OR_FUNCTION_DECL_P (newdecl
))
2755 if (DECL_EXTERNAL (olddecl
)
2756 || TREE_PUBLIC (olddecl
)
2757 || TREE_STATIC (olddecl
))
2759 /* Merge the section attribute.
2760 We want to issue an error if the sections conflict but that must be
2761 done later in decl_attributes since we are called before attributes
2763 if (DECL_SECTION_NAME (newdecl
) != NULL
)
2764 set_decl_section_name (olddecl
, DECL_SECTION_NAME (newdecl
));
2766 if (DECL_ONE_ONLY (newdecl
))
2768 struct symtab_node
*oldsym
, *newsym
;
2769 if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
2770 oldsym
= cgraph_node::get_create (olddecl
);
2772 oldsym
= varpool_node::get_create (olddecl
);
2773 newsym
= symtab_node::get (newdecl
);
2774 oldsym
->set_comdat_group (newsym
->get_comdat_group ());
2779 && CP_DECL_THREAD_LOCAL_P (newdecl
))
2781 CP_DECL_THREAD_LOCAL_P (olddecl
) = true;
2782 if (!processing_template_decl
)
2783 set_decl_tls_model (olddecl
, DECL_TLS_MODEL (newdecl
));
2787 DECL_UID (olddecl
) = olddecl_uid
;
2789 DECL_FRIEND_P (olddecl
) = 1;
2792 DECL_ANTICIPATED (olddecl
) = 1;
2793 DECL_HIDDEN_FRIEND_P (olddecl
) = 1;
2796 /* NEWDECL contains the merged attribute lists.
2797 Update OLDDECL to be the same. */
2798 DECL_ATTRIBUTES (olddecl
) = DECL_ATTRIBUTES (newdecl
);
2800 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2801 so that encode_section_info has a chance to look at the new decl
2802 flags and attributes. */
2803 if (DECL_RTL_SET_P (olddecl
)
2804 && (TREE_CODE (olddecl
) == FUNCTION_DECL
2806 && TREE_STATIC (olddecl
))))
2807 make_decl_rtl (olddecl
);
2809 /* The NEWDECL will no longer be needed. Because every out-of-class
2810 declaration of a member results in a call to duplicate_decls,
2811 freeing these nodes represents in a significant savings.
2813 Before releasing the node, be sore to remove function from symbol
2814 table that might have been inserted there to record comdat group.
2815 Be sure to however do not free DECL_STRUCT_FUNCTION because this
2816 structure is shared in between newdecl and oldecl. */
2817 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2818 DECL_STRUCT_FUNCTION (newdecl
) = NULL
;
2819 if (VAR_OR_FUNCTION_DECL_P (newdecl
))
2821 struct symtab_node
*snode
= symtab_node::get (newdecl
);
2826 /* Remove the associated constraints for newdecl, if any, before
2827 reclaiming memory. */
2829 remove_constraints (newdecl
);
2836 /* Return zero if the declaration NEWDECL is valid
2837 when the declaration OLDDECL (assumed to be for the same name)
2838 has already been seen.
2839 Otherwise return an error message format string with a %s
2840 where the identifier should go. */
2843 redeclaration_error_message (tree newdecl
, tree olddecl
)
2845 if (TREE_CODE (newdecl
) == TYPE_DECL
)
2847 /* Because C++ can put things into name space for free,
2848 constructs like "typedef struct foo { ... } foo"
2849 would look like an erroneous redeclaration. */
2850 if (same_type_p (TREE_TYPE (newdecl
), TREE_TYPE (olddecl
)))
2853 return G_("redefinition of %q#D");
2855 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2857 /* If this is a pure function, its olddecl will actually be
2858 the original initialization to `0' (which we force to call
2859 abort()). Don't complain about redefinition in this case. */
2860 if (DECL_LANG_SPECIFIC (olddecl
) && DECL_PURE_VIRTUAL_P (olddecl
)
2861 && DECL_INITIAL (olddecl
) == NULL_TREE
)
2864 /* If both functions come from different namespaces, this is not
2865 a redeclaration - this is a conflict with a used function. */
2866 if (DECL_NAMESPACE_SCOPE_P (olddecl
)
2867 && DECL_CONTEXT (olddecl
) != DECL_CONTEXT (newdecl
)
2868 && ! decls_match (olddecl
, newdecl
))
2869 return G_("%qD conflicts with used function");
2871 /* We'll complain about linkage mismatches in
2872 warn_extern_redeclared_static. */
2874 /* Defining the same name twice is no good. */
2875 if (decl_defined_p (olddecl
)
2876 && decl_defined_p (newdecl
))
2878 if (DECL_NAME (olddecl
) == NULL_TREE
)
2879 return G_("%q#D not declared in class");
2880 else if (!GNU_INLINE_P (olddecl
)
2881 || GNU_INLINE_P (newdecl
))
2882 return G_("redefinition of %q#D");
2885 if (DECL_DECLARED_INLINE_P (olddecl
) && DECL_DECLARED_INLINE_P (newdecl
))
2887 bool olda
= GNU_INLINE_P (olddecl
);
2888 bool newa
= GNU_INLINE_P (newdecl
);
2893 return G_("%q+D redeclared inline with "
2894 "%<gnu_inline%> attribute");
2896 return G_("%q+D redeclared inline without "
2897 "%<gnu_inline%> attribute");
2901 check_abi_tag_redeclaration
2902 (olddecl
, lookup_attribute ("abi_tag", DECL_ATTRIBUTES (olddecl
)),
2903 lookup_attribute ("abi_tag", DECL_ATTRIBUTES (newdecl
)));
2907 else if (TREE_CODE (newdecl
) == TEMPLATE_DECL
)
2911 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) == TYPE_DECL
)
2913 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl
))
2914 && COMPLETE_TYPE_P (TREE_TYPE (olddecl
)))
2915 return G_("redefinition of %q#D");
2919 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) != FUNCTION_DECL
2920 || (DECL_TEMPLATE_RESULT (newdecl
)
2921 == DECL_TEMPLATE_RESULT (olddecl
)))
2924 nt
= DECL_TEMPLATE_RESULT (newdecl
);
2925 if (DECL_TEMPLATE_INFO (nt
))
2926 nt
= DECL_TEMPLATE_RESULT (template_for_substitution (nt
));
2927 ot
= DECL_TEMPLATE_RESULT (olddecl
);
2928 if (DECL_TEMPLATE_INFO (ot
))
2929 ot
= DECL_TEMPLATE_RESULT (template_for_substitution (ot
));
2930 if (DECL_INITIAL (nt
) && DECL_INITIAL (ot
)
2931 && (!GNU_INLINE_P (ot
) || GNU_INLINE_P (nt
)))
2932 return G_("redefinition of %q#D");
2934 if (DECL_DECLARED_INLINE_P (ot
) && DECL_DECLARED_INLINE_P (nt
))
2936 bool olda
= GNU_INLINE_P (ot
);
2937 bool newa
= GNU_INLINE_P (nt
);
2942 return G_("%q+D redeclared inline with "
2943 "%<gnu_inline%> attribute");
2945 return G_("%q+D redeclared inline without "
2946 "%<gnu_inline%> attribute");
2950 /* Core issue #226 (C++0x):
2952 If a friend function template declaration specifies a
2953 default template-argument, that declaration shall be a
2954 definition and shall be the only declaration of the
2955 function template in the translation unit. */
2956 if ((cxx_dialect
!= cxx98
)
2957 && TREE_CODE (ot
) == FUNCTION_DECL
&& DECL_FRIEND_P (ot
)
2958 && !check_default_tmpl_args (nt
, DECL_TEMPLATE_PARMS (newdecl
),
2959 /*is_primary=*/true,
2960 /*is_partial=*/false,
2961 /*is_friend_decl=*/2))
2962 return G_("redeclaration of friend %q#D "
2963 "may not have default template arguments");
2967 else if (VAR_P (newdecl
)
2968 && CP_DECL_THREAD_LOCAL_P (newdecl
) != CP_DECL_THREAD_LOCAL_P (olddecl
)
2969 && (! DECL_LANG_SPECIFIC (olddecl
)
2970 || ! CP_DECL_THREADPRIVATE_P (olddecl
)
2971 || CP_DECL_THREAD_LOCAL_P (newdecl
)))
2973 /* Only variables can be thread-local, and all declarations must
2974 agree on this property. */
2975 if (CP_DECL_THREAD_LOCAL_P (newdecl
))
2976 return G_("thread-local declaration of %q#D follows "
2977 "non-thread-local declaration");
2979 return G_("non-thread-local declaration of %q#D follows "
2980 "thread-local declaration");
2982 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl
))
2984 /* The objects have been declared at namespace scope. If either
2985 is a member of an anonymous union, then this is an invalid
2986 redeclaration. For example:
2992 if ((VAR_P (newdecl
) && DECL_ANON_UNION_VAR_P (newdecl
))
2993 || (VAR_P (olddecl
) && DECL_ANON_UNION_VAR_P (olddecl
)))
2994 return G_("redeclaration of %q#D");
2995 /* If at least one declaration is a reference, there is no
2996 conflict. For example:
3002 if (DECL_EXTERNAL (newdecl
) || DECL_EXTERNAL (olddecl
))
3005 /* Static data member declared outside a class definition
3006 if the variable is defined within the class with constexpr
3007 specifier is declaration rather than definition (and
3009 if (cxx_dialect
>= cxx17
3011 && DECL_CLASS_SCOPE_P (olddecl
)
3012 && DECL_DECLARED_CONSTEXPR_P (olddecl
)
3013 && !DECL_INITIAL (newdecl
))
3015 DECL_EXTERNAL (newdecl
) = 1;
3016 /* For now, only warn with explicit -Wdeprecated. */
3017 if (global_options_set
.x_warn_deprecated
)
3019 auto_diagnostic_group d
;
3020 if (warning_at (DECL_SOURCE_LOCATION (newdecl
), OPT_Wdeprecated
,
3021 "redundant redeclaration of %<constexpr%> "
3022 "static data member %qD", newdecl
))
3023 inform (DECL_SOURCE_LOCATION (olddecl
),
3024 "previous declaration of %qD", olddecl
);
3029 /* Reject two definitions. */
3030 return G_("redefinition of %q#D");
3034 /* Objects declared with block scope: */
3035 /* Reject two definitions, and reject a definition
3036 together with an external reference. */
3037 if (!(DECL_EXTERNAL (newdecl
) && DECL_EXTERNAL (olddecl
)))
3038 return G_("redeclaration of %q#D");
3044 /* Hash and equality functions for the named_label table. */
3047 named_label_hash::hash (const value_type entry
)
3049 return IDENTIFIER_HASH_VALUE (entry
->name
);
3053 named_label_hash::equal (const value_type entry
, compare_type name
)
3055 return name
== entry
->name
;
3058 /* Look for a label named ID in the current function. If one cannot
3059 be found, create one. Return the named_label_entry, or NULL on
3062 static named_label_entry
*
3063 lookup_label_1 (tree id
, bool making_local_p
)
3065 /* You can't use labels at global scope. */
3066 if (current_function_decl
== NULL_TREE
)
3068 error ("label %qE referenced outside of any function", id
);
3073 named_labels
= hash_table
<named_label_hash
>::create_ggc (13);
3075 hashval_t hash
= IDENTIFIER_HASH_VALUE (id
);
3076 named_label_entry
**slot
3077 = named_labels
->find_slot_with_hash (id
, hash
, INSERT
);
3078 named_label_entry
*old
= *slot
;
3080 if (old
&& old
->label_decl
)
3082 if (!making_local_p
)
3085 if (old
->binding_level
== current_binding_level
)
3087 error ("local label %qE conflicts with existing label", id
);
3088 inform (DECL_SOURCE_LOCATION (old
->label_decl
), "previous label");
3093 /* We are making a new decl, create or reuse the named_label_entry */
3094 named_label_entry
*ent
= NULL
;
3095 if (old
&& !old
->label_decl
)
3099 ent
= ggc_cleared_alloc
<named_label_entry
> ();
3105 /* Now create the LABEL_DECL. */
3106 tree decl
= build_decl (input_location
, LABEL_DECL
, id
, void_type_node
);
3108 DECL_CONTEXT (decl
) = current_function_decl
;
3109 SET_DECL_MODE (decl
, VOIDmode
);
3112 C_DECLARED_LABEL_FLAG (decl
) = true;
3113 DECL_CHAIN (decl
) = current_binding_level
->names
;
3114 current_binding_level
->names
= decl
;
3117 ent
->label_decl
= decl
;
3122 /* Wrapper for lookup_label_1. */
3125 lookup_label (tree id
)
3127 bool subtime
= timevar_cond_start (TV_NAME_LOOKUP
);
3128 named_label_entry
*ent
= lookup_label_1 (id
, false);
3129 timevar_cond_stop (TV_NAME_LOOKUP
, subtime
);
3130 return ent
? ent
->label_decl
: NULL_TREE
;
3134 declare_local_label (tree id
)
3136 bool subtime
= timevar_cond_start (TV_NAME_LOOKUP
);
3137 named_label_entry
*ent
= lookup_label_1 (id
, true);
3138 timevar_cond_stop (TV_NAME_LOOKUP
, subtime
);
3139 return ent
? ent
->label_decl
: NULL_TREE
;
3142 /* Returns nonzero if it is ill-formed to jump past the declaration of
3143 DECL. Returns 2 if it's also a real problem. */
3146 decl_jump_unsafe (tree decl
)
3148 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
3149 with automatic storage duration is not in scope to a point where it is
3150 in scope is ill-formed unless the variable has scalar type, class type
3151 with a trivial default constructor and a trivial destructor, a
3152 cv-qualified version of one of these types, or an array of one of the
3153 preceding types and is declared without an initializer (8.5). */
3154 tree type
= TREE_TYPE (decl
);
3156 if (!VAR_P (decl
) || TREE_STATIC (decl
)
3157 || type
== error_mark_node
)
3160 if (DECL_NONTRIVIALLY_INITIALIZED_P (decl
)
3161 || variably_modified_type_p (type
, NULL_TREE
))
3164 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
))
3170 /* A subroutine of check_previous_goto_1 and check_goto to identify a branch
3174 identify_goto (tree decl
, location_t loc
, const location_t
*locus
,
3175 diagnostic_t diag_kind
)
3178 = emit_diagnostic (diag_kind
, loc
, 0,
3179 decl
? N_("jump to label %qD")
3180 : N_("jump to case label"), decl
);
3181 if (complained
&& locus
)
3182 inform (*locus
, " from here");
3186 /* Check that a single previously seen jump to a newly defined label
3187 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
3188 the jump context; NAMES are the names in scope in LEVEL at the jump
3189 context; LOCUS is the source position of the jump or 0. Returns
3190 true if all is well. */
3193 check_previous_goto_1 (tree decl
, cp_binding_level
* level
, tree names
,
3194 bool exited_omp
, const location_t
*locus
)
3196 cp_binding_level
*b
;
3197 bool complained
= false;
3199 bool saw_eh
= false, saw_omp
= false, saw_tm
= false, saw_cxif
= false;
3203 complained
= identify_goto (decl
, input_location
, locus
, DK_ERROR
);
3205 inform (input_location
, " exits OpenMP structured block");
3210 for (b
= current_binding_level
; b
; b
= b
->level_chain
)
3212 tree new_decls
, old_decls
= (b
== level
? names
: NULL_TREE
);
3214 for (new_decls
= b
->names
; new_decls
!= old_decls
;
3215 new_decls
= (DECL_P (new_decls
) ? DECL_CHAIN (new_decls
)
3216 : TREE_CHAIN (new_decls
)))
3218 int problem
= decl_jump_unsafe (new_decls
);
3224 complained
= identify_goto (decl
, input_location
, locus
,
3226 ? DK_ERROR
: DK_PERMERROR
);
3232 inform (DECL_SOURCE_LOCATION (new_decls
),
3233 " crosses initialization of %q#D", new_decls
);
3235 inform (DECL_SOURCE_LOCATION (new_decls
),
3236 " enters scope of %q#D, which has "
3237 "non-trivial destructor", new_decls
);
3244 const char *inf
= NULL
;
3245 location_t loc
= input_location
;
3250 inf
= G_(" enters %<try%> block");
3256 inf
= G_(" enters %<catch%> block");
3262 inf
= G_(" enters OpenMP structured block");
3266 case sk_transaction
:
3268 inf
= G_(" enters synchronized or atomic statement");
3273 if (!saw_cxif
&& level_for_constexpr_if (b
->level_chain
))
3275 inf
= G_(" enters %<constexpr if%> statement");
3276 loc
= EXPR_LOCATION (b
->level_chain
->this_entity
);
3288 complained
= identify_goto (decl
, input_location
, locus
, DK_ERROR
);
3299 check_previous_goto (tree decl
, struct named_label_use_entry
*use
)
3301 check_previous_goto_1 (decl
, use
->binding_level
,
3302 use
->names_in_scope
, use
->in_omp_scope
,
3303 &use
->o_goto_locus
);
3307 check_switch_goto (cp_binding_level
* level
)
3309 return check_previous_goto_1 (NULL_TREE
, level
, level
->names
, false, NULL
);
3312 /* Check that a new jump to a label DECL is OK. Called by
3313 finish_goto_stmt. */
3316 check_goto (tree decl
)
3318 /* We can't know where a computed goto is jumping.
3319 So we assume that it's OK. */
3320 if (TREE_CODE (decl
) != LABEL_DECL
)
3323 /* We didn't record any information about this label when we created it,
3324 and there's not much point since it's trivial to analyze as a return. */
3325 if (decl
== cdtor_label
)
3328 hashval_t hash
= IDENTIFIER_HASH_VALUE (DECL_NAME (decl
));
3329 named_label_entry
**slot
3330 = named_labels
->find_slot_with_hash (DECL_NAME (decl
), hash
, NO_INSERT
);
3331 named_label_entry
*ent
= *slot
;
3333 /* If the label hasn't been defined yet, defer checking. */
3334 if (! DECL_INITIAL (decl
))
3336 /* Don't bother creating another use if the last goto had the
3337 same data, and will therefore create the same set of errors. */
3339 && ent
->uses
->names_in_scope
== current_binding_level
->names
)
3342 named_label_use_entry
*new_use
3343 = ggc_alloc
<named_label_use_entry
> ();
3344 new_use
->binding_level
= current_binding_level
;
3345 new_use
->names_in_scope
= current_binding_level
->names
;
3346 new_use
->o_goto_locus
= input_location
;
3347 new_use
->in_omp_scope
= false;
3349 new_use
->next
= ent
->uses
;
3350 ent
->uses
= new_use
;
3354 bool saw_catch
= false, complained
= false;
3359 if (ent
->in_try_scope
|| ent
->in_catch_scope
|| ent
->in_transaction_scope
3360 || ent
->in_constexpr_if
3361 || ent
->in_omp_scope
|| !vec_safe_is_empty (ent
->bad_decls
))
3363 diagnostic_t diag_kind
= DK_PERMERROR
;
3364 if (ent
->in_try_scope
|| ent
->in_catch_scope
|| ent
->in_constexpr_if
3365 || ent
->in_transaction_scope
|| ent
->in_omp_scope
)
3366 diag_kind
= DK_ERROR
;
3367 complained
= identify_goto (decl
, DECL_SOURCE_LOCATION (decl
),
3368 &input_location
, diag_kind
);
3369 identified
= 1 + (diag_kind
== DK_ERROR
);
3372 FOR_EACH_VEC_SAFE_ELT (ent
->bad_decls
, ix
, bad
)
3374 int u
= decl_jump_unsafe (bad
);
3376 if (u
> 1 && DECL_ARTIFICIAL (bad
))
3378 /* Can't skip init of __exception_info. */
3379 if (identified
== 1)
3381 complained
= identify_goto (decl
, DECL_SOURCE_LOCATION (decl
),
3382 &input_location
, DK_ERROR
);
3386 inform (DECL_SOURCE_LOCATION (bad
), " enters %<catch%> block");
3389 else if (complained
)
3392 inform (DECL_SOURCE_LOCATION (bad
),
3393 " skips initialization of %q#D", bad
);
3395 inform (DECL_SOURCE_LOCATION (bad
),
3396 " enters scope of %q#D which has "
3397 "non-trivial destructor", bad
);
3403 if (ent
->in_try_scope
)
3404 inform (input_location
, " enters %<try%> block");
3405 else if (ent
->in_catch_scope
&& !saw_catch
)
3406 inform (input_location
, " enters %<catch%> block");
3407 else if (ent
->in_transaction_scope
)
3408 inform (input_location
, " enters synchronized or atomic statement");
3409 else if (ent
->in_constexpr_if
)
3410 inform (input_location
, " enters %<constexpr if%> statement");
3413 if (ent
->in_omp_scope
)
3416 inform (input_location
, " enters OpenMP structured block");
3418 else if (flag_openmp
)
3419 for (cp_binding_level
*b
= current_binding_level
; b
; b
= b
->level_chain
)
3421 if (b
== ent
->binding_level
)
3423 if (b
->kind
== sk_omp
)
3427 complained
= identify_goto (decl
,
3428 DECL_SOURCE_LOCATION (decl
),
3429 &input_location
, DK_ERROR
);
3433 inform (input_location
, " exits OpenMP structured block");
3439 /* Check that a return is ok wrt OpenMP structured blocks.
3440 Called by finish_return_stmt. Returns true if all is well. */
3443 check_omp_return (void)
3445 for (cp_binding_level
*b
= current_binding_level
; b
; b
= b
->level_chain
)
3446 if (b
->kind
== sk_omp
)
3448 error ("invalid exit from OpenMP structured block");
3451 else if (b
->kind
== sk_function_parms
)
3456 /* Define a label, specifying the location in the source file.
3457 Return the LABEL_DECL node for the label. */
3460 define_label_1 (location_t location
, tree name
)
3462 /* After labels, make any new cleanups in the function go into their
3463 own new (temporary) binding contour. */
3464 for (cp_binding_level
*p
= current_binding_level
;
3465 p
->kind
!= sk_function_parms
;
3467 p
->more_cleanups_ok
= 0;
3469 named_label_entry
*ent
= lookup_label_1 (name
, false);
3470 tree decl
= ent
->label_decl
;
3472 if (DECL_INITIAL (decl
) != NULL_TREE
)
3474 error ("duplicate label %qD", decl
);
3475 return error_mark_node
;
3479 /* Mark label as having been defined. */
3480 DECL_INITIAL (decl
) = error_mark_node
;
3481 /* Say where in the source. */
3482 DECL_SOURCE_LOCATION (decl
) = location
;
3484 ent
->binding_level
= current_binding_level
;
3485 ent
->names_in_scope
= current_binding_level
->names
;
3487 for (named_label_use_entry
*use
= ent
->uses
; use
; use
= use
->next
)
3488 check_previous_goto (decl
, use
);
3495 /* Wrapper for define_label_1. */
3498 define_label (location_t location
, tree name
)
3500 bool running
= timevar_cond_start (TV_NAME_LOOKUP
);
3501 tree ret
= define_label_1 (location
, name
);
3502 timevar_cond_stop (TV_NAME_LOOKUP
, running
);
3509 cp_binding_level
*level
;
3510 struct cp_switch
*next
;
3511 /* The SWITCH_STMT being built. */
3513 /* A splay-tree mapping the low element of a case range to the high
3514 element, or NULL_TREE if there is no high element. Used to
3515 determine whether or not a new case label duplicates an old case
3516 label. We need a tree, rather than simply a hash table, because
3517 of the GNU case range extension. */
3519 /* Remember whether a default: case label has been seen. */
3521 /* Remember whether a BREAK_STMT has been seen in this SWITCH_STMT. */
3522 bool break_stmt_seen_p
;
3523 /* Set if inside of {FOR,DO,WHILE}_BODY nested inside of a switch,
3524 where BREAK_STMT doesn't belong to the SWITCH_STMT. */
3525 bool in_loop_body_p
;
3528 /* A stack of the currently active switch statements. The innermost
3529 switch statement is on the top of the stack. There is no need to
3530 mark the stack for garbage collection because it is only active
3531 during the processing of the body of a function, and we never
3532 collect at that point. */
3534 static struct cp_switch
*switch_stack
;
3536 /* Called right after a switch-statement condition is parsed.
3537 SWITCH_STMT is the switch statement being parsed. */
3540 push_switch (tree switch_stmt
)
3542 struct cp_switch
*p
= XNEW (struct cp_switch
);
3543 p
->level
= current_binding_level
;
3544 p
->next
= switch_stack
;
3545 p
->switch_stmt
= switch_stmt
;
3546 p
->cases
= splay_tree_new (case_compare
, NULL
, NULL
);
3547 p
->has_default_p
= false;
3548 p
->break_stmt_seen_p
= false;
3549 p
->in_loop_body_p
= false;
3556 struct cp_switch
*cs
= switch_stack
;
3557 location_t switch_location
;
3559 /* Emit warnings as needed. */
3560 switch_location
= cp_expr_loc_or_input_loc (cs
->switch_stmt
);
3561 const bool bool_cond_p
3562 = (SWITCH_STMT_TYPE (cs
->switch_stmt
)
3563 && TREE_CODE (SWITCH_STMT_TYPE (cs
->switch_stmt
)) == BOOLEAN_TYPE
);
3564 if (!processing_template_decl
)
3565 c_do_switch_warnings (cs
->cases
, switch_location
,
3566 SWITCH_STMT_TYPE (cs
->switch_stmt
),
3567 SWITCH_STMT_COND (cs
->switch_stmt
), bool_cond_p
);
3569 /* For the benefit of block_may_fallthru remember if the switch body
3570 case labels cover all possible values and if there are break; stmts. */
3571 if (cs
->has_default_p
3572 || (!processing_template_decl
3573 && c_switch_covers_all_cases_p (cs
->cases
,
3574 SWITCH_STMT_TYPE (cs
->switch_stmt
))))
3575 SWITCH_STMT_ALL_CASES_P (cs
->switch_stmt
) = 1;
3576 if (!cs
->break_stmt_seen_p
)
3577 SWITCH_STMT_NO_BREAK_P (cs
->switch_stmt
) = 1;
3578 gcc_assert (!cs
->in_loop_body_p
);
3579 splay_tree_delete (cs
->cases
);
3580 switch_stack
= switch_stack
->next
;
3584 /* Note that a BREAK_STMT is about to be added. If it is inside of
3585 a SWITCH_STMT and not inside of a loop body inside of it, note
3586 in switch_stack we've seen a BREAK_STMT. */
3589 note_break_stmt (void)
3591 if (switch_stack
&& !switch_stack
->in_loop_body_p
)
3592 switch_stack
->break_stmt_seen_p
= true;
3595 /* Note the start of processing of an iteration statement's body.
3596 The note_break_stmt function will do nothing while processing it.
3597 Return a flag that should be passed to note_iteration_stmt_body_end. */
3600 note_iteration_stmt_body_start (void)
3604 bool ret
= switch_stack
->in_loop_body_p
;
3605 switch_stack
->in_loop_body_p
= true;
3609 /* Note the end of processing of an iteration statement's body. */
3612 note_iteration_stmt_body_end (bool prev
)
3615 switch_stack
->in_loop_body_p
= prev
;
3618 /* Convert a case constant VALUE in a switch to the type TYPE of the switch
3619 condition. Note that if TYPE and VALUE are already integral we don't
3620 really do the conversion because the language-independent
3621 warning/optimization code will work better that way. */
3624 case_conversion (tree type
, tree value
)
3626 if (value
== NULL_TREE
)
3629 value
= mark_rvalue_use (value
);
3631 if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type
))
3632 type
= type_promotes_to (type
);
3634 tree ovalue
= value
;
3635 /* The constant-expression VALUE shall be a converted constant expression
3636 of the adjusted type of the switch condition, which doesn't allow
3637 narrowing conversions. */
3638 value
= build_converted_constant_expr (type
, value
, tf_warning_or_error
);
3640 if (cxx_dialect
>= cxx11
3641 && (SCOPED_ENUM_P (type
)
3642 || !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (ovalue
))))
3643 /* Use the converted value. */;
3645 /* The already integral case. */
3648 return cxx_constant_value (value
);
3651 /* Note that we've seen a definition of a case label, and complain if this
3652 is a bad place for one. */
3655 finish_case_label (location_t loc
, tree low_value
, tree high_value
)
3658 cp_binding_level
*p
;
3661 if (low_value
== NULL_TREE
&& high_value
== NULL_TREE
)
3662 switch_stack
->has_default_p
= true;
3664 if (processing_template_decl
)
3668 /* For templates, just add the case label; we'll do semantic
3669 analysis at instantiation-time. */
3670 label
= build_decl (loc
, LABEL_DECL
, NULL_TREE
, void_type_node
);
3671 return add_stmt (build_case_label (low_value
, high_value
, label
));
3674 /* Find the condition on which this switch statement depends. */
3675 cond
= SWITCH_STMT_COND (switch_stack
->switch_stmt
);
3676 if (cond
&& TREE_CODE (cond
) == TREE_LIST
)
3677 cond
= TREE_VALUE (cond
);
3679 if (!check_switch_goto (switch_stack
->level
))
3680 return error_mark_node
;
3682 type
= SWITCH_STMT_TYPE (switch_stack
->switch_stmt
);
3683 if (type
== error_mark_node
)
3684 return error_mark_node
;
3686 low_value
= case_conversion (type
, low_value
);
3687 high_value
= case_conversion (type
, high_value
);
3689 r
= c_add_case_label (loc
, switch_stack
->cases
, cond
, low_value
, high_value
);
3691 /* After labels, make any new cleanups in the function go into their
3692 own new (temporary) binding contour. */
3693 for (p
= current_binding_level
;
3694 p
->kind
!= sk_function_parms
;
3696 p
->more_cleanups_ok
= 0;
3701 struct typename_info
{
3709 struct typename_hasher
: ggc_ptr_hash
<tree_node
>
3711 typedef typename_info
*compare_type
;
3713 /* Hash a TYPENAME_TYPE. */
3720 hash
= (htab_hash_pointer (TYPE_CONTEXT (t
))
3721 ^ htab_hash_pointer (TYPE_IDENTIFIER (t
)));
3726 /* Compare two TYPENAME_TYPEs. */
3729 equal (tree t1
, const typename_info
*t2
)
3731 return (TYPE_IDENTIFIER (t1
) == t2
->name
3732 && TYPE_CONTEXT (t1
) == t2
->scope
3733 && TYPENAME_TYPE_FULLNAME (t1
) == t2
->template_id
3734 && TYPENAME_IS_ENUM_P (t1
) == t2
->enum_p
3735 && TYPENAME_IS_CLASS_P (t1
) == t2
->class_p
);
3739 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
3740 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
3742 Returns the new TYPENAME_TYPE. */
3744 static GTY (()) hash_table
<typename_hasher
> *typename_htab
;
3747 build_typename_type (tree context
, tree name
, tree fullname
,
3748 enum tag_types tag_type
)
3756 if (typename_htab
== NULL
)
3757 typename_htab
= hash_table
<typename_hasher
>::create_ggc (61);
3759 ti
.scope
= FROB_CONTEXT (context
);
3761 ti
.template_id
= fullname
;
3762 ti
.enum_p
= tag_type
== enum_type
;
3763 ti
.class_p
= (tag_type
== class_type
3764 || tag_type
== record_type
3765 || tag_type
== union_type
);
3766 hash
= (htab_hash_pointer (ti
.scope
)
3767 ^ htab_hash_pointer (ti
.name
));
3769 /* See if we already have this type. */
3770 e
= typename_htab
->find_slot_with_hash (&ti
, hash
, INSERT
);
3775 /* Build the TYPENAME_TYPE. */
3776 t
= cxx_make_type (TYPENAME_TYPE
);
3777 TYPE_CONTEXT (t
) = ti
.scope
;
3778 TYPENAME_TYPE_FULLNAME (t
) = ti
.template_id
;
3779 TYPENAME_IS_ENUM_P (t
) = ti
.enum_p
;
3780 TYPENAME_IS_CLASS_P (t
) = ti
.class_p
;
3782 /* Build the corresponding TYPE_DECL. */
3783 d
= build_decl (input_location
, TYPE_DECL
, name
, t
);
3784 TYPE_NAME (TREE_TYPE (d
)) = d
;
3785 TYPE_STUB_DECL (TREE_TYPE (d
)) = d
;
3786 DECL_CONTEXT (d
) = FROB_CONTEXT (context
);
3787 DECL_ARTIFICIAL (d
) = 1;
3789 /* Store it in the hash table. */
3792 /* TYPENAME_TYPEs must always be compared structurally, because
3793 they may or may not resolve down to another type depending on
3794 the currently open classes. */
3795 SET_TYPE_STRUCTURAL_EQUALITY (t
);
3801 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
3802 provided to name the type. Returns an appropriate type, unless an
3803 error occurs, in which case error_mark_node is returned. If we
3804 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
3805 return that, rather than the _TYPE it corresponds to, in other
3806 cases we look through the type decl. If TF_ERROR is set, complain
3807 about errors, otherwise be quiet. */
3810 make_typename_type (tree context
, tree name
, enum tag_types tag_type
,
3811 tsubst_flags_t complain
)
3817 if (name
== error_mark_node
3818 || context
== NULL_TREE
3819 || context
== error_mark_node
)
3820 return error_mark_node
;
3824 if (!(TYPE_LANG_SPECIFIC (name
)
3825 && (CLASSTYPE_IS_TEMPLATE (name
)
3826 || CLASSTYPE_USE_TEMPLATE (name
))))
3827 name
= TYPE_IDENTIFIER (name
);
3829 /* Create a TEMPLATE_ID_EXPR for the type. */
3830 name
= build_nt (TEMPLATE_ID_EXPR
,
3831 CLASSTYPE_TI_TEMPLATE (name
),
3832 CLASSTYPE_TI_ARGS (name
));
3834 else if (TREE_CODE (name
) == TYPE_DECL
)
3835 name
= DECL_NAME (name
);
3839 if (TREE_CODE (name
) == TEMPLATE_ID_EXPR
)
3841 name
= TREE_OPERAND (name
, 0);
3842 if (DECL_TYPE_TEMPLATE_P (name
))
3843 name
= TREE_OPERAND (fullname
, 0) = DECL_NAME (name
);
3844 if (TREE_CODE (name
) != IDENTIFIER_NODE
)
3846 if (complain
& tf_error
)
3847 error ("%qD is not a type", name
);
3848 return error_mark_node
;
3851 if (TREE_CODE (name
) == TEMPLATE_DECL
)
3853 if (complain
& tf_error
)
3854 error ("%qD used without template arguments", name
);
3855 return error_mark_node
;
3857 gcc_assert (identifier_p (name
));
3858 gcc_assert (TYPE_P (context
));
3860 if (TREE_CODE (context
) == TYPE_PACK_EXPANSION
)
3861 /* This can happen for C++17 variadic using (c++/88986). */;
3862 else if (!MAYBE_CLASS_TYPE_P (context
))
3864 if (complain
& tf_error
)
3865 error ("%q#T is not a class", context
);
3866 return error_mark_node
;
3869 /* When the CONTEXT is a dependent type, NAME could refer to a
3870 dependent base class of CONTEXT. But look inside it anyway
3871 if CONTEXT is a currently open scope, in case it refers to a
3872 member of the current instantiation or a non-dependent base;
3873 lookup will stop when we hit a dependent base. */
3874 if (!dependent_scope_p (context
))
3875 /* We should only set WANT_TYPE when we're a nested typename type.
3876 Then we can give better diagnostics if we find a non-type. */
3877 t
= lookup_field (context
, name
, 2, /*want_type=*/true);
3881 if ((!t
|| TREE_CODE (t
) == TREE_LIST
) && dependent_type_p (context
))
3882 return build_typename_type (context
, name
, fullname
, tag_type
);
3884 want_template
= TREE_CODE (fullname
) == TEMPLATE_ID_EXPR
;
3888 if (complain
& tf_error
)
3890 if (!COMPLETE_TYPE_P (context
))
3891 cxx_incomplete_type_error (NULL_TREE
, context
);
3893 error (want_template
? G_("no class template named %q#T in %q#T")
3894 : G_("no type named %q#T in %q#T"), name
, context
);
3896 return error_mark_node
;
3899 /* Pull out the template from an injected-class-name (or multiple). */
3901 t
= maybe_get_template_decl_from_type_decl (t
);
3903 if (TREE_CODE (t
) == TREE_LIST
)
3905 if (complain
& tf_error
)
3907 error ("lookup of %qT in %qT is ambiguous", name
, context
);
3908 print_candidates (t
);
3910 return error_mark_node
;
3913 if (want_template
&& !DECL_TYPE_TEMPLATE_P (t
))
3915 if (complain
& tf_error
)
3916 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3918 return error_mark_node
;
3920 if (!want_template
&& TREE_CODE (t
) != TYPE_DECL
)
3922 if (complain
& tf_error
)
3923 error ("%<typename %T::%D%> names %q#T, which is not a type",
3925 return error_mark_node
;
3928 if (!perform_or_defer_access_check (TYPE_BINFO (context
), t
, t
, complain
))
3929 return error_mark_node
;
3931 /* If we are currently parsing a template and if T is a typedef accessed
3932 through CONTEXT then we need to remember and check access of T at
3933 template instantiation time. */
3934 add_typedef_to_current_template_for_access_check (t
, context
, input_location
);
3937 return lookup_template_class (t
, TREE_OPERAND (fullname
, 1),
3939 /*entering_scope=*/0,
3940 complain
| tf_user
);
3942 if (DECL_ARTIFICIAL (t
) || !(complain
& tf_keep_type_decl
))
3945 maybe_record_typedef_use (t
);
3950 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3951 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3952 in which case error_mark_node is returned.
3954 If PARM_LIST is non-NULL, also make sure that the template parameter
3955 list of TEMPLATE_DECL matches.
3957 If COMPLAIN zero, don't complain about any errors that occur. */
3960 make_unbound_class_template (tree context
, tree name
, tree parm_list
,
3961 tsubst_flags_t complain
)
3967 name
= TYPE_IDENTIFIER (name
);
3968 else if (DECL_P (name
))
3969 name
= DECL_NAME (name
);
3970 gcc_assert (identifier_p (name
));
3972 if (!dependent_type_p (context
)
3973 || currently_open_class (context
))
3975 tree tmpl
= NULL_TREE
;
3977 if (MAYBE_CLASS_TYPE_P (context
))
3978 tmpl
= lookup_field (context
, name
, 0, false);
3980 if (tmpl
&& TREE_CODE (tmpl
) == TYPE_DECL
)
3981 tmpl
= maybe_get_template_decl_from_type_decl (tmpl
);
3983 if (!tmpl
|| !DECL_TYPE_TEMPLATE_P (tmpl
))
3985 if (complain
& tf_error
)
3986 error ("no class template named %q#T in %q#T", name
, context
);
3987 return error_mark_node
;
3991 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl
), parm_list
))
3993 if (complain
& tf_error
)
3995 error ("template parameters do not match template %qD", tmpl
);
3996 inform (DECL_SOURCE_LOCATION (tmpl
),
3997 "%qD declared here", tmpl
);
3999 return error_mark_node
;
4002 if (!perform_or_defer_access_check (TYPE_BINFO (context
), tmpl
, tmpl
,
4004 return error_mark_node
;
4009 /* Build the UNBOUND_CLASS_TEMPLATE. */
4010 t
= cxx_make_type (UNBOUND_CLASS_TEMPLATE
);
4011 TYPE_CONTEXT (t
) = FROB_CONTEXT (context
);
4012 TREE_TYPE (t
) = NULL_TREE
;
4013 SET_TYPE_STRUCTURAL_EQUALITY (t
);
4015 /* Build the corresponding TEMPLATE_DECL. */
4016 d
= build_decl (input_location
, TEMPLATE_DECL
, name
, t
);
4017 TYPE_NAME (TREE_TYPE (d
)) = d
;
4018 TYPE_STUB_DECL (TREE_TYPE (d
)) = d
;
4019 DECL_CONTEXT (d
) = FROB_CONTEXT (context
);
4020 DECL_ARTIFICIAL (d
) = 1;
4021 DECL_TEMPLATE_PARMS (d
) = parm_list
;
4028 /* Push the declarations of builtin types into the global namespace.
4029 RID_INDEX is the index of the builtin type in the array
4030 RID_POINTERS. NAME is the name used when looking up the builtin
4031 type. TYPE is the _TYPE node for the builtin type.
4033 The calls to set_global_binding below should be
4034 eliminated. Built-in types should not be looked up name; their
4035 names are keywords that the parser can recognize. However, there
4036 is code in c-common.c that uses identifier_global_value to look up
4037 built-in types by name. */
4040 record_builtin_type (enum rid rid_index
,
4044 tree decl
= NULL_TREE
;
4048 tree tname
= get_identifier (name
);
4049 tree tdecl
= build_decl (BUILTINS_LOCATION
, TYPE_DECL
, tname
, type
);
4050 DECL_ARTIFICIAL (tdecl
) = 1;
4051 set_global_binding (tdecl
);
4055 if ((int) rid_index
< (int) RID_MAX
)
4056 if (tree rname
= ridpointers
[(int) rid_index
])
4057 if (!decl
|| DECL_NAME (decl
) != rname
)
4059 tree rdecl
= build_decl (BUILTINS_LOCATION
, TYPE_DECL
, rname
, type
);
4060 DECL_ARTIFICIAL (rdecl
) = 1;
4061 set_global_binding (rdecl
);
4068 if (!TYPE_NAME (type
))
4069 TYPE_NAME (type
) = decl
;
4070 debug_hooks
->type_decl (decl
, 0);
4074 /* Push a type into the namespace so that the back ends ignore it. */
4077 record_unknown_type (tree type
, const char* name
)
4079 tree decl
= pushdecl (build_decl (UNKNOWN_LOCATION
,
4080 TYPE_DECL
, get_identifier (name
), type
));
4081 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
4082 DECL_IGNORED_P (decl
) = 1;
4083 TYPE_DECL_SUPPRESS_DEBUG (decl
) = 1;
4084 TYPE_SIZE (type
) = TYPE_SIZE (void_type_node
);
4085 SET_TYPE_ALIGN (type
, 1);
4086 TYPE_USER_ALIGN (type
) = 0;
4087 SET_TYPE_MODE (type
, TYPE_MODE (void_type_node
));
4090 /* Create all the predefined identifiers. */
4093 initialize_predefined_identifiers (void)
4095 struct predefined_identifier
4097 const char *name
; /* Name. */
4098 tree
*node
; /* Node to store it in. */
4099 cp_identifier_kind kind
; /* Kind of identifier. */
4102 /* A table of identifiers to create at startup. */
4103 static const predefined_identifier predefined_identifiers
[] = {
4104 {"C++", &lang_name_cplusplus
, cik_normal
},
4105 {"C", &lang_name_c
, cik_normal
},
4106 /* Some of these names have a trailing space so that it is
4107 impossible for them to conflict with names written by users. */
4108 {"__ct ", &ctor_identifier
, cik_ctor
},
4109 {"__ct_base ", &base_ctor_identifier
, cik_ctor
},
4110 {"__ct_comp ", &complete_ctor_identifier
, cik_ctor
},
4111 {"__dt ", &dtor_identifier
, cik_dtor
},
4112 {"__dt_base ", &base_dtor_identifier
, cik_dtor
},
4113 {"__dt_comp ", &complete_dtor_identifier
, cik_dtor
},
4114 {"__dt_del ", &deleting_dtor_identifier
, cik_dtor
},
4115 {"__conv_op ", &conv_op_identifier
, cik_conv_op
},
4116 {"__in_chrg", &in_charge_identifier
, cik_normal
},
4117 {"this", &this_identifier
, cik_normal
},
4118 {"__delta", &delta_identifier
, cik_normal
},
4119 {"__pfn", &pfn_identifier
, cik_normal
},
4120 {"_vptr", &vptr_identifier
, cik_normal
},
4121 {"__vtt_parm", &vtt_parm_identifier
, cik_normal
},
4122 {"::", &global_identifier
, cik_normal
},
4123 {"std", &std_identifier
, cik_normal
},
4124 /* The demangler expects anonymous namespaces to be called
4125 something starting with '_GLOBAL__N_'. It no longer needs
4126 to be unique to the TU. */
4127 {"_GLOBAL__N_1", &anon_identifier
, cik_normal
},
4128 {"auto", &auto_identifier
, cik_normal
},
4129 {"decltype(auto)", &decltype_auto_identifier
, cik_normal
},
4130 {"initializer_list", &init_list_identifier
, cik_normal
},
4131 {"__for_range ", &for_range__identifier
, cik_normal
},
4132 {"__for_begin ", &for_begin__identifier
, cik_normal
},
4133 {"__for_end ", &for_end__identifier
, cik_normal
},
4134 {"__for_range", &for_range_identifier
, cik_normal
},
4135 {"__for_begin", &for_begin_identifier
, cik_normal
},
4136 {"__for_end", &for_end_identifier
, cik_normal
},
4137 {"abi_tag", &abi_tag_identifier
, cik_normal
},
4138 {"aligned", &aligned_identifier
, cik_normal
},
4139 {"begin", &begin_identifier
, cik_normal
},
4140 {"end", &end_identifier
, cik_normal
},
4141 {"get", &get__identifier
, cik_normal
},
4142 {"gnu", &gnu_identifier
, cik_normal
},
4143 {"tuple_element", &tuple_element_identifier
, cik_normal
},
4144 {"tuple_size", &tuple_size_identifier
, cik_normal
},
4145 {"type", &type_identifier
, cik_normal
},
4146 {"value", &value_identifier
, cik_normal
},
4147 {"_FUN", &fun_identifier
, cik_normal
},
4148 {"__closure", &closure_identifier
, cik_normal
},
4149 {NULL
, NULL
, cik_normal
}
4152 for (const predefined_identifier
*pid
= predefined_identifiers
;
4155 *pid
->node
= get_identifier (pid
->name
);
4156 /* Some of these identifiers already have a special kind. */
4157 if (pid
->kind
!= cik_normal
)
4158 set_identifier_kind (*pid
->node
, pid
->kind
);
4162 /* Create the predefined scalar types of C,
4163 and some nodes representing standard constants (0, 1, (void *)0).
4164 Initialize the global binding level.
4165 Make definitions for built-in primitive functions. */
4168 cxx_init_decl_processing (void)
4171 tree void_ftype_ptr
;
4173 /* Create all the identifiers we need. */
4174 initialize_predefined_identifiers ();
4176 /* Create the global variables. */
4177 push_to_top_level ();
4179 current_function_decl
= NULL_TREE
;
4180 current_binding_level
= NULL
;
4181 /* Enter the global namespace. */
4182 gcc_assert (global_namespace
== NULL_TREE
);
4183 global_namespace
= build_lang_decl (NAMESPACE_DECL
, global_identifier
,
4185 TREE_PUBLIC (global_namespace
) = 1;
4186 DECL_CONTEXT (global_namespace
)
4187 = build_translation_unit_decl (get_identifier (main_input_filename
));
4188 /* Remember whether we want the empty class passing ABI change warning
4190 TRANSLATION_UNIT_WARN_EMPTY_P (DECL_CONTEXT (global_namespace
))
4191 = warn_abi
&& abi_version_crosses (12);
4192 debug_hooks
->register_main_translation_unit
4193 (DECL_CONTEXT (global_namespace
));
4194 begin_scope (sk_namespace
, global_namespace
);
4195 current_namespace
= global_namespace
;
4197 if (flag_visibility_ms_compat
)
4198 default_visibility
= VISIBILITY_HIDDEN
;
4201 current_lang_name
= lang_name_c
;
4203 /* Create the `std' namespace. */
4204 push_namespace (std_identifier
);
4205 std_node
= current_namespace
;
4208 flag_noexcept_type
= (cxx_dialect
>= cxx17
);
4210 c_common_nodes_and_builtins ();
4212 tree bool_ftype
= build_function_type_list (boolean_type_node
, NULL_TREE
);
4214 = add_builtin_function ("__builtin_is_constant_evaluated",
4215 bool_ftype
, CP_BUILT_IN_IS_CONSTANT_EVALUATED
,
4216 BUILT_IN_FRONTEND
, NULL
, NULL_TREE
);
4217 set_call_expr_flags (decl
, ECF_CONST
| ECF_NOTHROW
| ECF_LEAF
);
4219 integer_two_node
= build_int_cst (NULL_TREE
, 2);
4221 /* Guess at the initial static decls size. */
4222 vec_alloc (static_decls
, 500);
4224 /* ... and keyed classes. */
4225 vec_alloc (keyed_classes
, 100);
4227 record_builtin_type (RID_BOOL
, "bool", boolean_type_node
);
4228 truthvalue_type_node
= boolean_type_node
;
4229 truthvalue_false_node
= boolean_false_node
;
4230 truthvalue_true_node
= boolean_true_node
;
4232 empty_except_spec
= build_tree_list (NULL_TREE
, NULL_TREE
);
4233 noexcept_true_spec
= build_tree_list (boolean_true_node
, NULL_TREE
);
4234 noexcept_false_spec
= build_tree_list (boolean_false_node
, NULL_TREE
);
4235 noexcept_deferred_spec
= build_tree_list (make_node (DEFERRED_NOEXCEPT
),
4239 record_builtin_type (RID_MAX
, NULL
, string_type_node
);
4242 delta_type_node
= ptrdiff_type_node
;
4243 vtable_index_type
= ptrdiff_type_node
;
4245 vtt_parm_type
= build_pointer_type (const_ptr_type_node
);
4246 void_ftype
= build_function_type_list (void_type_node
, NULL_TREE
);
4247 void_ftype_ptr
= build_function_type_list (void_type_node
,
4248 ptr_type_node
, NULL_TREE
);
4250 = build_exception_variant (void_ftype_ptr
, empty_except_spec
);
4252 /* Create the conversion operator marker. This operator's DECL_NAME
4253 is in the identifier table, so we can use identifier equality to
4255 conv_op_marker
= build_lang_decl (FUNCTION_DECL
, conv_op_identifier
,
4258 /* C++ extensions */
4260 unknown_type_node
= make_node (LANG_TYPE
);
4261 record_unknown_type (unknown_type_node
, "unknown type");
4263 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
4264 TREE_TYPE (unknown_type_node
) = unknown_type_node
;
4266 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
4268 TYPE_POINTER_TO (unknown_type_node
) = unknown_type_node
;
4269 TYPE_REFERENCE_TO (unknown_type_node
) = unknown_type_node
;
4271 init_list_type_node
= make_node (LANG_TYPE
);
4272 record_unknown_type (init_list_type_node
, "init list");
4275 /* Make sure we get a unique function type, so we can give
4276 its pointer type a name. (This wins for gdb.) */
4277 tree vfunc_type
= make_node (FUNCTION_TYPE
);
4278 TREE_TYPE (vfunc_type
) = integer_type_node
;
4279 TYPE_ARG_TYPES (vfunc_type
) = NULL_TREE
;
4280 layout_type (vfunc_type
);
4282 vtable_entry_type
= build_pointer_type (vfunc_type
);
4284 record_builtin_type (RID_MAX
, "__vtbl_ptr_type", vtable_entry_type
);
4287 = build_cplus_array_type (vtable_entry_type
, NULL_TREE
);
4288 layout_type (vtbl_type_node
);
4289 vtbl_type_node
= cp_build_qualified_type (vtbl_type_node
, TYPE_QUAL_CONST
);
4290 record_builtin_type (RID_MAX
, NULL
, vtbl_type_node
);
4291 vtbl_ptr_type_node
= build_pointer_type (vtable_entry_type
);
4292 layout_type (vtbl_ptr_type_node
);
4293 record_builtin_type (RID_MAX
, NULL
, vtbl_ptr_type_node
);
4295 push_namespace (get_identifier ("__cxxabiv1"));
4296 abi_node
= current_namespace
;
4299 global_type_node
= make_node (LANG_TYPE
);
4300 record_unknown_type (global_type_node
, "global type");
4302 any_targ_node
= make_node (LANG_TYPE
);
4303 record_unknown_type (any_targ_node
, "any type");
4306 current_lang_name
= lang_name_cplusplus
;
4308 if (aligned_new_threshold
> 1
4309 && !pow2p_hwi (aligned_new_threshold
))
4311 error ("%<-faligned-new=%d%> is not a power of two",
4312 aligned_new_threshold
);
4313 aligned_new_threshold
= 1;
4315 if (aligned_new_threshold
== -1)
4316 aligned_new_threshold
= (cxx_dialect
>= cxx17
) ? 1 : 0;
4317 if (aligned_new_threshold
== 1)
4318 aligned_new_threshold
= malloc_alignment () / BITS_PER_UNIT
;
4321 tree newattrs
, extvisattr
;
4322 tree newtype
, deltype
;
4323 tree ptr_ftype_sizetype
;
4327 = build_function_type_list (ptr_type_node
, size_type_node
, NULL_TREE
);
4328 if (cxx_dialect
== cxx98
)
4331 tree bad_alloc_type_node
;
4332 tree bad_alloc_decl
;
4334 push_namespace (std_identifier
);
4335 bad_alloc_id
= get_identifier ("bad_alloc");
4336 bad_alloc_type_node
= make_class_type (RECORD_TYPE
);
4337 TYPE_CONTEXT (bad_alloc_type_node
) = current_namespace
;
4339 = create_implicit_typedef (bad_alloc_id
, bad_alloc_type_node
);
4340 DECL_CONTEXT (bad_alloc_decl
) = current_namespace
;
4344 = add_exception_specifier (NULL_TREE
, bad_alloc_type_node
, -1);
4347 new_eh_spec
= noexcept_false_spec
;
4349 /* Ensure attribs.c is initialized. */
4352 /* Ensure constraint.cc is initialized. */
4353 init_constraint_processing ();
4355 extvisattr
= build_tree_list (get_identifier ("externally_visible"),
4357 newattrs
= tree_cons (get_identifier ("alloc_size"),
4358 build_tree_list (NULL_TREE
, integer_one_node
),
4360 newtype
= cp_build_type_attribute_variant (ptr_ftype_sizetype
, newattrs
);
4361 newtype
= build_exception_variant (newtype
, new_eh_spec
);
4362 deltype
= cp_build_type_attribute_variant (void_ftype_ptr
, extvisattr
);
4363 deltype
= build_exception_variant (deltype
, empty_except_spec
);
4364 tree opnew
= push_cp_library_fn (NEW_EXPR
, newtype
, 0);
4365 DECL_IS_MALLOC (opnew
) = 1;
4366 DECL_SET_IS_OPERATOR_NEW (opnew
, true);
4367 opnew
= push_cp_library_fn (VEC_NEW_EXPR
, newtype
, 0);
4368 DECL_IS_MALLOC (opnew
) = 1;
4369 DECL_SET_IS_OPERATOR_NEW (opnew
, true);
4370 tree opdel
= push_cp_library_fn (DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4371 DECL_SET_IS_OPERATOR_DELETE (opdel
, true);
4372 opdel
= push_cp_library_fn (VEC_DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4373 DECL_SET_IS_OPERATOR_DELETE (opdel
, true);
4374 if (flag_sized_deallocation
)
4376 /* Also push the sized deallocation variants:
4377 void operator delete(void*, std::size_t) throw();
4378 void operator delete[](void*, std::size_t) throw(); */
4379 tree void_ftype_ptr_size
4380 = build_function_type_list (void_type_node
, ptr_type_node
,
4381 size_type_node
, NULL_TREE
);
4382 deltype
= cp_build_type_attribute_variant (void_ftype_ptr_size
,
4384 deltype
= build_exception_variant (deltype
, empty_except_spec
);
4385 opdel
= push_cp_library_fn (DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4386 DECL_SET_IS_OPERATOR_DELETE (opdel
, true);
4387 opdel
= push_cp_library_fn (VEC_DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4388 DECL_SET_IS_OPERATOR_DELETE (opdel
, true);
4391 if (aligned_new_threshold
)
4393 push_namespace (std_identifier
);
4394 tree align_id
= get_identifier ("align_val_t");
4395 align_type_node
= start_enum (align_id
, NULL_TREE
, size_type_node
,
4396 NULL_TREE
, /*scoped*/true, NULL
);
4399 /* operator new (size_t, align_val_t); */
4400 newtype
= build_function_type_list (ptr_type_node
, size_type_node
,
4401 align_type_node
, NULL_TREE
);
4402 newtype
= cp_build_type_attribute_variant (newtype
, newattrs
);
4403 newtype
= build_exception_variant (newtype
, new_eh_spec
);
4404 opnew
= push_cp_library_fn (NEW_EXPR
, newtype
, 0);
4405 DECL_IS_MALLOC (opnew
) = 1;
4406 DECL_SET_IS_OPERATOR_NEW (opnew
, true);
4407 opnew
= push_cp_library_fn (VEC_NEW_EXPR
, newtype
, 0);
4408 DECL_IS_MALLOC (opnew
) = 1;
4409 DECL_SET_IS_OPERATOR_NEW (opnew
, true);
4411 /* operator delete (void *, align_val_t); */
4412 deltype
= build_function_type_list (void_type_node
, ptr_type_node
,
4413 align_type_node
, NULL_TREE
);
4414 deltype
= cp_build_type_attribute_variant (deltype
, extvisattr
);
4415 deltype
= build_exception_variant (deltype
, empty_except_spec
);
4416 opdel
= push_cp_library_fn (DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4417 DECL_SET_IS_OPERATOR_DELETE (opdel
, true);
4418 opdel
= push_cp_library_fn (VEC_DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4419 DECL_SET_IS_OPERATOR_DELETE (opdel
, true);
4421 if (flag_sized_deallocation
)
4423 /* operator delete (void *, size_t, align_val_t); */
4424 deltype
= build_function_type_list (void_type_node
, ptr_type_node
,
4425 size_type_node
, align_type_node
,
4427 deltype
= cp_build_type_attribute_variant (deltype
, extvisattr
);
4428 deltype
= build_exception_variant (deltype
, empty_except_spec
);
4429 opdel
= push_cp_library_fn (DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4430 DECL_SET_IS_OPERATOR_DELETE (opdel
, true);
4431 opdel
= push_cp_library_fn (VEC_DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4432 DECL_SET_IS_OPERATOR_DELETE (opdel
, true);
4436 nullptr_type_node
= make_node (NULLPTR_TYPE
);
4437 TYPE_SIZE (nullptr_type_node
) = bitsize_int (GET_MODE_BITSIZE (ptr_mode
));
4438 TYPE_SIZE_UNIT (nullptr_type_node
) = size_int (GET_MODE_SIZE (ptr_mode
));
4439 TYPE_UNSIGNED (nullptr_type_node
) = 1;
4440 TYPE_PRECISION (nullptr_type_node
) = GET_MODE_BITSIZE (ptr_mode
);
4441 if (abi_version_at_least (9))
4442 SET_TYPE_ALIGN (nullptr_type_node
, GET_MODE_ALIGNMENT (ptr_mode
));
4443 SET_TYPE_MODE (nullptr_type_node
, ptr_mode
);
4444 record_builtin_type (RID_MAX
, "decltype(nullptr)", nullptr_type_node
);
4445 nullptr_node
= build_int_cst (nullptr_type_node
, 0);
4449 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype
,
4450 ECF_NORETURN
| ECF_NOTHROW
| ECF_COLD
);
4452 /* Perform other language dependent initializations. */
4453 init_class_processing ();
4454 init_rtti_processing ();
4455 init_template_processing ();
4457 if (flag_exceptions
)
4458 init_exception_processing ();
4460 if (! supports_one_only ())
4463 make_fname_decl
= cp_make_fname_decl
;
4464 start_fname_decls ();
4466 /* Show we use EH for cleanups. */
4467 if (flag_exceptions
)
4468 using_eh_for_cleanups ();
4471 /* Generate an initializer for a function naming variable from
4472 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
4473 filled in with the type of the init. */
4476 cp_fname_init (const char* name
, tree
*type_p
)
4478 tree domain
= NULL_TREE
;
4480 tree init
= NULL_TREE
;
4485 length
= strlen (name
);
4486 domain
= build_index_type (size_int (length
));
4487 init
= build_string (length
+ 1, name
);
4490 type
= cp_build_qualified_type (char_type_node
, TYPE_QUAL_CONST
);
4491 type
= build_cplus_array_type (type
, domain
);
4496 TREE_TYPE (init
) = type
;
4498 init
= error_mark_node
;
4503 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
4504 the decl, LOC is the location to give the decl, NAME is the
4505 initialization string and TYPE_DEP indicates whether NAME depended
4506 on the type of the function. We make use of that to detect
4507 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
4508 at the point of first use, so we mustn't push the decl now. */
4511 cp_make_fname_decl (location_t loc
, tree id
, int type_dep
)
4513 const char * name
= NULL
;
4514 bool release_name
= false;
4515 if (!(type_dep
&& in_template_function ()))
4517 if (current_function_decl
== NULL_TREE
)
4519 else if (type_dep
== 1) /* __PRETTY_FUNCTION__ */
4520 name
= cxx_printable_name (current_function_decl
, 2);
4521 else if (type_dep
== 0) /* __FUNCTION__ */
4523 name
= fname_as_string (type_dep
);
4524 release_name
= true;
4530 tree init
= cp_fname_init (name
, &type
);
4531 tree decl
= build_decl (loc
, VAR_DECL
, id
, type
);
4534 free (CONST_CAST (char *, name
));
4536 /* As we're using pushdecl_with_scope, we must set the context. */
4537 DECL_CONTEXT (decl
) = current_function_decl
;
4539 TREE_READONLY (decl
) = 1;
4540 DECL_ARTIFICIAL (decl
) = 1;
4541 DECL_DECLARED_CONSTEXPR_P (decl
) = 1;
4542 TREE_STATIC (decl
) = 1;
4544 TREE_USED (decl
) = 1;
4548 SET_DECL_VALUE_EXPR (decl
, init
);
4549 DECL_HAS_VALUE_EXPR_P (decl
) = 1;
4550 /* For decl_constant_var_p. */
4551 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
) = 1;
4554 if (current_function_decl
)
4556 DECL_CONTEXT (decl
) = current_function_decl
;
4557 decl
= pushdecl_outermost_localscope (decl
);
4558 if (decl
!= error_mark_node
)
4559 add_decl_expr (decl
);
4563 DECL_THIS_STATIC (decl
) = true;
4564 pushdecl_top_level_and_finish (decl
, NULL_TREE
);
4571 builtin_function_1 (tree decl
, tree context
, bool is_global
)
4573 tree id
= DECL_NAME (decl
);
4574 const char *name
= IDENTIFIER_POINTER (id
);
4576 retrofit_lang_decl (decl
);
4578 DECL_ARTIFICIAL (decl
) = 1;
4579 SET_DECL_LANGUAGE (decl
, lang_c
);
4580 /* Runtime library routines are, by definition, available in an
4581 external shared object. */
4582 DECL_VISIBILITY (decl
) = VISIBILITY_DEFAULT
;
4583 DECL_VISIBILITY_SPECIFIED (decl
) = 1;
4585 DECL_CONTEXT (decl
) = context
;
4587 /* A function in the user's namespace should have an explicit
4588 declaration before it is used. Mark the built-in function as
4589 anticipated but not actually declared. */
4590 if (name
[0] != '_' || name
[1] != '_')
4591 DECL_ANTICIPATED (decl
) = 1;
4592 else if (strncmp (name
+ 2, "builtin_", strlen ("builtin_")) != 0)
4594 size_t len
= strlen (name
);
4596 /* Treat __*_chk fortification functions as anticipated as well,
4597 unless they are __builtin_*. */
4598 if (len
> strlen ("___chk")
4599 && memcmp (name
+ len
- strlen ("_chk"),
4600 "_chk", strlen ("_chk") + 1) == 0)
4601 DECL_ANTICIPATED (decl
) = 1;
4605 return pushdecl_top_level (decl
);
4607 return pushdecl (decl
);
4611 cxx_builtin_function (tree decl
)
4613 tree id
= DECL_NAME (decl
);
4614 const char *name
= IDENTIFIER_POINTER (id
);
4615 /* All builtins that don't begin with an '_' should additionally
4616 go in the 'std' namespace. */
4619 tree decl2
= copy_node(decl
);
4620 push_namespace (std_identifier
);
4621 builtin_function_1 (decl2
, std_node
, false);
4625 return builtin_function_1 (decl
, NULL_TREE
, false);
4628 /* Like cxx_builtin_function, but guarantee the function is added to the global
4629 scope. This is to allow function specific options to add new machine
4630 dependent builtins when the target ISA changes via attribute((target(...)))
4631 which saves space on program startup if the program does not use non-generic
4635 cxx_builtin_function_ext_scope (tree decl
)
4638 tree id
= DECL_NAME (decl
);
4639 const char *name
= IDENTIFIER_POINTER (id
);
4640 /* All builtins that don't begin with an '_' should additionally
4641 go in the 'std' namespace. */
4644 tree decl2
= copy_node(decl
);
4645 push_namespace (std_identifier
);
4646 builtin_function_1 (decl2
, std_node
, true);
4650 return builtin_function_1 (decl
, NULL_TREE
, true);
4653 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
4654 function. Not called directly. */
4657 build_library_fn (tree name
, enum tree_code operator_code
, tree type
,
4660 tree fn
= build_lang_decl (FUNCTION_DECL
, name
, type
);
4661 DECL_EXTERNAL (fn
) = 1;
4662 TREE_PUBLIC (fn
) = 1;
4663 DECL_ARTIFICIAL (fn
) = 1;
4664 DECL_OVERLOADED_OPERATOR_CODE_RAW (fn
)
4665 = OVL_OP_INFO (false, operator_code
)->ovl_op_code
;
4666 SET_DECL_LANGUAGE (fn
, lang_c
);
4667 /* Runtime library routines are, by definition, available in an
4668 external shared object. */
4669 DECL_VISIBILITY (fn
) = VISIBILITY_DEFAULT
;
4670 DECL_VISIBILITY_SPECIFIED (fn
) = 1;
4671 set_call_expr_flags (fn
, ecf_flags
);
4675 /* Returns the _DECL for a library function with C++ linkage. */
4678 build_cp_library_fn (tree name
, enum tree_code operator_code
, tree type
,
4681 tree fn
= build_library_fn (name
, operator_code
, type
, ecf_flags
);
4682 DECL_CONTEXT (fn
) = FROB_CONTEXT (current_namespace
);
4683 SET_DECL_LANGUAGE (fn
, lang_cplusplus
);
4687 /* Like build_library_fn, but takes a C string instead of an
4691 build_library_fn_ptr (const char* name
, tree type
, int ecf_flags
)
4693 return build_library_fn (get_identifier (name
), ERROR_MARK
, type
, ecf_flags
);
4696 /* Like build_cp_library_fn, but takes a C string instead of an
4700 build_cp_library_fn_ptr (const char* name
, tree type
, int ecf_flags
)
4702 return build_cp_library_fn (get_identifier (name
), ERROR_MARK
, type
,
4706 /* Like build_library_fn, but also pushes the function so that we will
4707 be able to find it via get_global_binding. Also, the function
4708 may throw exceptions listed in RAISES. */
4711 push_library_fn (tree name
, tree type
, tree raises
, int ecf_flags
)
4716 type
= build_exception_variant (type
, raises
);
4718 fn
= build_library_fn (name
, ERROR_MARK
, type
, ecf_flags
);
4719 pushdecl_top_level (fn
);
4723 /* Like build_cp_library_fn, but also pushes the function so that it
4724 will be found by normal lookup. */
4727 push_cp_library_fn (enum tree_code operator_code
, tree type
,
4730 tree fn
= build_cp_library_fn (ovl_op_identifier (false, operator_code
),
4731 operator_code
, type
, ecf_flags
);
4734 apply_tm_attr (fn
, get_identifier ("transaction_safe"));
4738 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
4742 push_void_library_fn (tree name
, tree parmtypes
, int ecf_flags
)
4744 tree type
= build_function_type (void_type_node
, parmtypes
);
4745 return push_library_fn (name
, type
, NULL_TREE
, ecf_flags
);
4748 /* Like push_library_fn, but also note that this function throws
4749 and does not return. Used for __throw_foo and the like. */
4752 push_throw_library_fn (tree name
, tree type
)
4754 tree fn
= push_library_fn (name
, type
, NULL_TREE
, ECF_NORETURN
| ECF_COLD
);
4758 /* When we call finish_struct for an anonymous union, we create
4759 default copy constructors and such. But, an anonymous union
4760 shouldn't have such things; this function undoes the damage to the
4761 anonymous union type T.
4763 (The reason that we create the synthesized methods is that we don't
4764 distinguish `union { int i; }' from `typedef union { int i; } U'.
4765 The first is an anonymous union; the second is just an ordinary
4769 fixup_anonymous_aggr (tree t
)
4771 /* Wipe out memory of synthesized methods. */
4772 TYPE_HAS_USER_CONSTRUCTOR (t
) = 0;
4773 TYPE_HAS_DEFAULT_CONSTRUCTOR (t
) = 0;
4774 TYPE_HAS_COPY_CTOR (t
) = 0;
4775 TYPE_HAS_CONST_COPY_CTOR (t
) = 0;
4776 TYPE_HAS_COPY_ASSIGN (t
) = 0;
4777 TYPE_HAS_CONST_COPY_ASSIGN (t
) = 0;
4779 /* Splice the implicitly generated functions out of TYPE_FIELDS. */
4780 for (tree probe
, *prev_p
= &TYPE_FIELDS (t
); (probe
= *prev_p
);)
4781 if (TREE_CODE (probe
) == FUNCTION_DECL
&& DECL_ARTIFICIAL (probe
))
4782 *prev_p
= DECL_CHAIN (probe
);
4784 prev_p
= &DECL_CHAIN (probe
);
4786 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
4787 assignment operators (because they cannot have these methods themselves).
4788 For anonymous unions this is already checked because they are not allowed
4789 in any union, otherwise we have to check it. */
4790 if (TREE_CODE (t
) != UNION_TYPE
)
4794 for (field
= TYPE_FIELDS (t
); field
; field
= DECL_CHAIN (field
))
4795 if (TREE_CODE (field
) == FIELD_DECL
)
4797 type
= TREE_TYPE (field
);
4798 if (CLASS_TYPE_P (type
))
4800 if (TYPE_NEEDS_CONSTRUCTING (type
))
4801 error ("member %q+#D with constructor not allowed "
4802 "in anonymous aggregate", field
);
4803 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
))
4804 error ("member %q+#D with destructor not allowed "
4805 "in anonymous aggregate", field
);
4806 if (TYPE_HAS_COMPLEX_COPY_ASSIGN (type
))
4807 error ("member %q+#D with copy assignment operator "
4808 "not allowed in anonymous aggregate", field
);
4814 /* Warn for an attribute located at LOCATION that appertains to the
4815 class type CLASS_TYPE that has not been properly placed after its
4816 class-key, in it class-specifier. */
4819 warn_misplaced_attr_for_class_type (location_t location
,
4822 gcc_assert (OVERLOAD_TYPE_P (class_type
));
4824 auto_diagnostic_group d
;
4825 if (warning_at (location
, OPT_Wattributes
,
4826 "attribute ignored in declaration "
4827 "of %q#T", class_type
))
4829 "attribute for %q#T must follow the %qs keyword",
4830 class_type
, class_key_or_enum_as_string (class_type
));
4833 /* Returns the cv-qualifiers that apply to the type specified
4834 by the DECLSPECS. */
4837 get_type_quals (const cp_decl_specifier_seq
*declspecs
)
4839 int type_quals
= TYPE_UNQUALIFIED
;
4841 if (decl_spec_seq_has_spec_p (declspecs
, ds_const
))
4842 type_quals
|= TYPE_QUAL_CONST
;
4843 if (decl_spec_seq_has_spec_p (declspecs
, ds_volatile
))
4844 type_quals
|= TYPE_QUAL_VOLATILE
;
4845 if (decl_spec_seq_has_spec_p (declspecs
, ds_restrict
))
4846 type_quals
|= TYPE_QUAL_RESTRICT
;
4851 /* Make sure that a declaration with no declarator is well-formed, i.e.
4852 just declares a tagged type or anonymous union.
4854 Returns the type declared; or NULL_TREE if none. */
4857 check_tag_decl (cp_decl_specifier_seq
*declspecs
,
4858 bool explicit_type_instantiation_p
)
4860 int saw_friend
= decl_spec_seq_has_spec_p (declspecs
, ds_friend
);
4861 int saw_typedef
= decl_spec_seq_has_spec_p (declspecs
, ds_typedef
);
4862 /* If a class, struct, or enum type is declared by the DECLSPECS
4863 (i.e, if a class-specifier, enum-specifier, or non-typename
4864 elaborated-type-specifier appears in the DECLSPECS),
4865 DECLARED_TYPE is set to the corresponding type. */
4866 tree declared_type
= NULL_TREE
;
4867 bool error_p
= false;
4869 if (declspecs
->multiple_types_p
)
4870 error_at (smallest_type_location (declspecs
),
4871 "multiple types in one declaration");
4872 else if (declspecs
->redefined_builtin_type
)
4874 if (!in_system_header_at (input_location
))
4875 permerror (declspecs
->locations
[ds_redefined_builtin_type_spec
],
4876 "redeclaration of C++ built-in type %qT",
4877 declspecs
->redefined_builtin_type
);
4882 && TYPE_P (declspecs
->type
)
4883 && ((TREE_CODE (declspecs
->type
) != TYPENAME_TYPE
4884 && MAYBE_CLASS_TYPE_P (declspecs
->type
))
4885 || TREE_CODE (declspecs
->type
) == ENUMERAL_TYPE
))
4886 declared_type
= declspecs
->type
;
4887 else if (declspecs
->type
== error_mark_node
)
4890 if (type_uses_auto (declared_type
))
4892 error_at (declspecs
->locations
[ds_type_spec
],
4893 "%<auto%> can only be specified for variables "
4894 "or function declarations");
4895 return error_mark_node
;
4898 if (declared_type
&& !OVERLOAD_TYPE_P (declared_type
))
4899 declared_type
= NULL_TREE
;
4901 if (!declared_type
&& !saw_friend
&& !error_p
)
4902 permerror (input_location
, "declaration does not declare anything");
4903 /* Check for an anonymous union. */
4904 else if (declared_type
&& RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type
))
4905 && TYPE_UNNAMED_P (declared_type
))
4907 /* 7/3 In a simple-declaration, the optional init-declarator-list
4908 can be omitted only when declaring a class (clause 9) or
4909 enumeration (7.2), that is, when the decl-specifier-seq contains
4910 either a class-specifier, an elaborated-type-specifier with
4911 a class-key (9.1), or an enum-specifier. In these cases and
4912 whenever a class-specifier or enum-specifier is present in the
4913 decl-specifier-seq, the identifiers in these specifiers are among
4914 the names being declared by the declaration (as class-name,
4915 enum-names, or enumerators, depending on the syntax). In such
4916 cases, and except for the declaration of an unnamed bit-field (9.6),
4917 the decl-specifier-seq shall introduce one or more names into the
4918 program, or shall redeclare a name introduced by a previous
4919 declaration. [Example:
4920 enum { }; // ill-formed
4921 typedef class { }; // ill-formed
4925 error ("missing type-name in typedef-declaration");
4928 /* Anonymous unions are objects, so they can have specifiers. */;
4929 SET_ANON_AGGR_TYPE_P (declared_type
);
4931 if (TREE_CODE (declared_type
) != UNION_TYPE
4932 && !in_system_header_at (input_location
))
4933 pedwarn (input_location
, OPT_Wpedantic
, "ISO C++ prohibits anonymous structs");
4938 if (decl_spec_seq_has_spec_p (declspecs
, ds_inline
))
4939 error_at (declspecs
->locations
[ds_inline
],
4940 "%<inline%> can only be specified for functions");
4941 else if (decl_spec_seq_has_spec_p (declspecs
, ds_virtual
))
4942 error_at (declspecs
->locations
[ds_virtual
],
4943 "%<virtual%> can only be specified for functions");
4945 && (!current_class_type
4946 || current_scope () != current_class_type
))
4947 error_at (declspecs
->locations
[ds_friend
],
4948 "%<friend%> can only be specified inside a class");
4949 else if (decl_spec_seq_has_spec_p (declspecs
, ds_explicit
))
4950 error_at (declspecs
->locations
[ds_explicit
],
4951 "%<explicit%> can only be specified for constructors");
4952 else if (declspecs
->storage_class
)
4953 error_at (declspecs
->locations
[ds_storage_class
],
4954 "a storage class can only be specified for objects "
4956 else if (decl_spec_seq_has_spec_p (declspecs
, ds_const
))
4957 error_at (declspecs
->locations
[ds_const
],
4958 "%<const%> can only be specified for objects and "
4960 else if (decl_spec_seq_has_spec_p (declspecs
, ds_volatile
))
4961 error_at (declspecs
->locations
[ds_volatile
],
4962 "%<volatile%> can only be specified for objects and "
4964 else if (decl_spec_seq_has_spec_p (declspecs
, ds_restrict
))
4965 error_at (declspecs
->locations
[ds_restrict
],
4966 "%<__restrict%> can only be specified for objects and "
4968 else if (decl_spec_seq_has_spec_p (declspecs
, ds_thread
))
4969 error_at (declspecs
->locations
[ds_thread
],
4970 "%<__thread%> can only be specified for objects "
4972 else if (saw_typedef
)
4973 warning_at (declspecs
->locations
[ds_typedef
], 0,
4974 "%<typedef%> was ignored in this declaration");
4975 else if (decl_spec_seq_has_spec_p (declspecs
, ds_constexpr
))
4976 error_at (declspecs
->locations
[ds_constexpr
],
4977 "%<constexpr%> cannot be used for type declarations");
4978 else if (decl_spec_seq_has_spec_p (declspecs
, ds_constinit
))
4979 error_at (declspecs
->locations
[ds_constinit
],
4980 "%<constinit%> cannot be used for type declarations");
4983 if (declspecs
->attributes
&& warn_attributes
&& declared_type
)
4986 if (!CLASS_TYPE_P (declared_type
)
4987 || !CLASSTYPE_TEMPLATE_INSTANTIATION (declared_type
))
4988 /* For a non-template class, use the name location. */
4989 loc
= location_of (declared_type
);
4991 /* For a template class (an explicit instantiation), use the
4992 current location. */
4993 loc
= input_location
;
4995 if (explicit_type_instantiation_p
)
4996 /* [dcl.attr.grammar]/4:
4998 No attribute-specifier-seq shall appertain to an explicit
5001 if (warning_at (loc
, OPT_Wattributes
,
5002 "attribute ignored in explicit instantiation %q#T",
5005 "no attribute can be applied to "
5006 "an explicit instantiation");
5009 warn_misplaced_attr_for_class_type (loc
, declared_type
);
5012 return declared_type
;
5015 /* Called when a declaration is seen that contains no names to declare.
5016 If its type is a reference to a structure, union or enum inherited
5017 from a containing scope, shadow that tag name for the current scope
5018 with a forward reference.
5019 If its type defines a new named structure or union
5020 or defines an enum, it is valid but we need not do anything here.
5021 Otherwise, it is an error.
5023 C++: may have to grok the declspecs to learn about static,
5024 complain for anonymous unions.
5026 Returns the TYPE declared -- or NULL_TREE if none. */
5029 shadow_tag (cp_decl_specifier_seq
*declspecs
)
5031 tree t
= check_tag_decl (declspecs
,
5032 /*explicit_type_instantiation_p=*/false);
5037 if (maybe_process_partial_specialization (t
) == error_mark_node
)
5040 /* This is where the variables in an anonymous union are
5041 declared. An anonymous union declaration looks like:
5043 because there is no declarator after the union, the parser
5044 sends that declaration here. */
5045 if (ANON_AGGR_TYPE_P (t
))
5047 fixup_anonymous_aggr (t
);
5049 if (TYPE_FIELDS (t
))
5051 tree decl
= grokdeclarator (/*declarator=*/NULL
,
5052 declspecs
, NORMAL
, 0, NULL
);
5053 finish_anon_union (decl
);
5060 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
5063 groktypename (cp_decl_specifier_seq
*type_specifiers
,
5064 const cp_declarator
*declarator
,
5065 bool is_template_arg
)
5069 enum decl_context context
5070 = is_template_arg
? TEMPLATE_TYPE_ARG
: TYPENAME
;
5071 attrs
= type_specifiers
->attributes
;
5072 type_specifiers
->attributes
= NULL_TREE
;
5073 type
= grokdeclarator (declarator
, type_specifiers
, context
, 0, &attrs
);
5074 if (attrs
&& type
!= error_mark_node
)
5076 if (CLASS_TYPE_P (type
))
5077 warning (OPT_Wattributes
, "ignoring attributes applied to class type %qT "
5078 "outside of definition", type
);
5079 else if (MAYBE_CLASS_TYPE_P (type
))
5080 /* A template type parameter or other dependent type. */
5081 warning (OPT_Wattributes
, "ignoring attributes applied to dependent "
5082 "type %qT without an associated declaration", type
);
5084 cplus_decl_attributes (&type
, attrs
, 0);
5089 /* Process a DECLARATOR for a function-scope variable declaration,
5090 namespace-scope variable declaration, or function declaration.
5091 (Function definitions go through start_function; class member
5092 declarations appearing in the body of the class go through
5093 grokfield.) The DECL corresponding to the DECLARATOR is returned.
5094 If an error occurs, the error_mark_node is returned instead.
5096 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
5097 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
5098 for an explicitly defaulted function, or SD_DELETED for an explicitly
5099 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
5100 implicitly initialized via a default constructor. ATTRIBUTES and
5101 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
5103 The scope represented by the context of the returned DECL is pushed
5104 (if it is not the global namespace) and is assigned to
5105 *PUSHED_SCOPE_P. The caller is then responsible for calling
5106 pop_scope on *PUSHED_SCOPE_P if it is set. */
5109 start_decl (const cp_declarator
*declarator
,
5110 cp_decl_specifier_seq
*declspecs
,
5113 tree prefix_attributes
,
5114 tree
*pushed_scope_p
)
5122 *pushed_scope_p
= NULL_TREE
;
5124 /* An object declared as __attribute__((deprecated)) suppresses
5125 warnings of uses of other deprecated items. */
5126 if (lookup_attribute ("deprecated", attributes
))
5127 deprecated_state
= DEPRECATED_SUPPRESS
;
5129 attributes
= chainon (attributes
, prefix_attributes
);
5131 decl
= grokdeclarator (declarator
, declspecs
, NORMAL
, initialized
,
5134 deprecated_state
= DEPRECATED_NORMAL
;
5136 if (decl
== NULL_TREE
|| VOID_TYPE_P (decl
)
5137 || decl
== error_mark_node
)
5138 return error_mark_node
;
5140 context
= CP_DECL_CONTEXT (decl
);
5141 if (context
!= global_namespace
)
5142 *pushed_scope_p
= push_scope (context
);
5144 /* Is it valid for this decl to have an initializer at all?
5145 If not, set INITIALIZED to zero, which will indirectly
5146 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
5148 && TREE_CODE (decl
) == TYPE_DECL
)
5150 error_at (DECL_SOURCE_LOCATION (decl
),
5151 "typedef %qD is initialized (use %qs instead)",
5153 return error_mark_node
;
5158 if (! toplevel_bindings_p ()
5159 && DECL_EXTERNAL (decl
))
5160 warning (0, "declaration of %q#D has %<extern%> and is initialized",
5162 DECL_EXTERNAL (decl
) = 0;
5163 if (toplevel_bindings_p ())
5164 TREE_STATIC (decl
) = 1;
5166 alias
= lookup_attribute ("alias", DECL_ATTRIBUTES (decl
)) != 0;
5168 if (alias
&& TREE_CODE (decl
) == FUNCTION_DECL
)
5169 record_key_method_defined (decl
);
5171 /* If this is a typedef that names the class for linkage purposes
5172 (7.1.3p8), apply any attributes directly to the type. */
5173 if (TREE_CODE (decl
) == TYPE_DECL
5174 && OVERLOAD_TYPE_P (TREE_TYPE (decl
))
5175 && decl
== TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl
))))
5176 flags
= ATTR_FLAG_TYPE_IN_PLACE
;
5180 /* Set attributes here so if duplicate decl, will have proper attributes. */
5181 cplus_decl_attributes (&decl
, attributes
, flags
);
5183 /* Dllimported symbols cannot be defined. Static data members (which
5184 can be initialized in-class and dllimported) go through grokfield,
5185 not here, so we don't need to exclude those decls when checking for
5187 if (initialized
&& DECL_DLLIMPORT_P (decl
))
5189 error_at (DECL_SOURCE_LOCATION (decl
),
5190 "definition of %q#D is marked %<dllimport%>", decl
);
5191 DECL_DLLIMPORT_P (decl
) = 0;
5194 /* If #pragma weak was used, mark the decl weak now. */
5195 if (!processing_template_decl
&& !DECL_DECOMPOSITION_P (decl
))
5196 maybe_apply_pragma_weak (decl
);
5198 if (TREE_CODE (decl
) == FUNCTION_DECL
5199 && DECL_DECLARED_INLINE_P (decl
)
5200 && DECL_UNINLINABLE (decl
)
5201 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl
)))
5202 warning_at (DECL_SOURCE_LOCATION (decl
), 0,
5203 "inline function %qD given attribute %qs", decl
, "noinline");
5205 if (TYPE_P (context
) && COMPLETE_TYPE_P (complete_type (context
)))
5207 bool this_tmpl
= (processing_template_decl
5208 > template_class_depth (context
));
5211 tree field
= lookup_field (context
, DECL_NAME (decl
), 0, false);
5212 if (field
== NULL_TREE
5213 || !(VAR_P (field
) || variable_template_p (field
)))
5214 error ("%q+#D is not a static data member of %q#T", decl
, context
);
5215 else if (variable_template_p (field
)
5216 && (DECL_LANG_SPECIFIC (decl
)
5217 && DECL_TEMPLATE_SPECIALIZATION (decl
)))
5218 /* OK, specialization was already checked. */;
5219 else if (variable_template_p (field
) && !this_tmpl
)
5221 error_at (DECL_SOURCE_LOCATION (decl
),
5222 "non-member-template declaration of %qD", decl
);
5223 inform (DECL_SOURCE_LOCATION (field
), "does not match "
5224 "member template declaration here");
5225 return error_mark_node
;
5229 if (variable_template_p (field
))
5230 field
= DECL_TEMPLATE_RESULT (field
);
5232 if (DECL_CONTEXT (field
) != context
)
5234 if (!same_type_p (DECL_CONTEXT (field
), context
))
5235 permerror (input_location
, "ISO C++ does not permit %<%T::%D%> "
5236 "to be defined as %<%T::%D%>",
5237 DECL_CONTEXT (field
), DECL_NAME (decl
),
5238 context
, DECL_NAME (decl
));
5239 DECL_CONTEXT (decl
) = DECL_CONTEXT (field
);
5241 /* Static data member are tricky; an in-class initialization
5242 still doesn't provide a definition, so the in-class
5243 declaration will have DECL_EXTERNAL set, but will have an
5244 initialization. Thus, duplicate_decls won't warn
5245 about this situation, and so we check here. */
5246 if (initialized
&& DECL_INITIALIZED_IN_CLASS_P (field
))
5247 error ("duplicate initialization of %qD", decl
);
5248 field
= duplicate_decls (decl
, field
,
5249 /*newdecl_is_friend=*/false);
5250 if (field
== error_mark_node
)
5251 return error_mark_node
;
5258 tree field
= check_classfn (context
, decl
,
5260 ? current_template_parms
5262 if (field
&& field
!= error_mark_node
5263 && duplicate_decls (decl
, field
,
5264 /*newdecl_is_friend=*/false))
5268 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
5269 DECL_IN_AGGR_P (decl
) = 0;
5270 /* Do not mark DECL as an explicit specialization if it was not
5271 already marked as an instantiation; a declaration should
5272 never be marked as a specialization unless we know what
5273 template is being specialized. */
5274 if (DECL_LANG_SPECIFIC (decl
) && DECL_USE_TEMPLATE (decl
))
5276 SET_DECL_TEMPLATE_SPECIALIZATION (decl
);
5277 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5278 DECL_COMDAT (decl
) = (TREE_PUBLIC (decl
)
5279 && DECL_DECLARED_INLINE_P (decl
));
5281 DECL_COMDAT (decl
) = false;
5283 /* [temp.expl.spec] An explicit specialization of a static data
5284 member of a template is a definition if the declaration
5285 includes an initializer; otherwise, it is a declaration.
5287 We check for processing_specialization so this only applies
5288 to the new specialization syntax. */
5289 if (!initialized
&& processing_specialization
)
5290 DECL_EXTERNAL (decl
) = 1;
5293 if (DECL_EXTERNAL (decl
) && ! DECL_TEMPLATE_SPECIALIZATION (decl
)
5294 /* Aliases are definitions. */
5296 permerror (declarator
->id_loc
,
5297 "declaration of %q#D outside of class is not definition",
5301 was_public
= TREE_PUBLIC (decl
);
5303 /* Enter this declaration into the symbol table. Don't push the plain
5304 VAR_DECL for a variable template. */
5305 if (!template_parm_scope_p ()
5307 decl
= maybe_push_decl (decl
);
5309 if (processing_template_decl
)
5311 /* Make sure that for a `constinit' decl push_template_decl creates
5312 a DECL_TEMPLATE_INFO info for us, so that cp_finish_decl can then set
5313 TINFO_VAR_DECLARED_CONSTINIT. */
5314 if (decl_spec_seq_has_spec_p (declspecs
, ds_constinit
))
5315 retrofit_lang_decl (decl
);
5316 decl
= push_template_decl (decl
);
5318 if (decl
== error_mark_node
)
5319 return error_mark_node
;
5322 && DECL_NAMESPACE_SCOPE_P (decl
) && !TREE_PUBLIC (decl
) && !was_public
5323 && !DECL_THIS_STATIC (decl
) && !DECL_ARTIFICIAL (decl
))
5325 /* This is a const variable with implicit 'static'. Set
5326 DECL_THIS_STATIC so we can tell it from variables that are
5327 !TREE_PUBLIC because of the anonymous namespace. */
5328 gcc_assert (CP_TYPE_CONST_P (TREE_TYPE (decl
)) || errorcount
);
5329 DECL_THIS_STATIC (decl
) = 1;
5332 if (current_function_decl
&& VAR_P (decl
)
5333 && DECL_DECLARED_CONSTEXPR_P (current_function_decl
))
5336 if (CP_DECL_THREAD_LOCAL_P (decl
))
5337 error_at (DECL_SOURCE_LOCATION (decl
),
5338 "%qD declared %<thread_local%> in %<constexpr%> function",
5340 else if (TREE_STATIC (decl
))
5341 error_at (DECL_SOURCE_LOCATION (decl
),
5342 "%qD declared %<static%> in %<constexpr%> function", decl
);
5346 cp_function_chain
->invalid_constexpr
= true;
5349 if (!processing_template_decl
&& VAR_P (decl
))
5350 start_decl_1 (decl
, initialized
);
5355 /* Process the declaration of a variable DECL. INITIALIZED is true
5356 iff DECL is explicitly initialized. (INITIALIZED is false if the
5357 variable is initialized via an implicitly-called constructor.)
5358 This function must be called for ordinary variables (including, for
5359 example, implicit instantiations of templates), but must not be
5360 called for template declarations. */
5363 start_decl_1 (tree decl
, bool initialized
)
5367 bool aggregate_definition_p
;
5369 gcc_assert (!processing_template_decl
);
5371 if (error_operand_p (decl
))
5374 gcc_assert (VAR_P (decl
));
5376 type
= TREE_TYPE (decl
);
5377 complete_p
= COMPLETE_TYPE_P (type
);
5378 aggregate_definition_p
= MAYBE_CLASS_TYPE_P (type
) && !DECL_EXTERNAL (decl
);
5380 /* If an explicit initializer is present, or if this is a definition
5381 of an aggregate, then we need a complete type at this point.
5382 (Scalars are always complete types, so there is nothing to
5383 check.) This code just sets COMPLETE_P; errors (if necessary)
5384 are issued below. */
5385 if ((initialized
|| aggregate_definition_p
)
5387 && COMPLETE_TYPE_P (complete_type (type
)))
5390 /* We will not yet have set TREE_READONLY on DECL if the type
5391 was "const", but incomplete, before this point. But, now, we
5392 have a complete type, so we can try again. */
5393 cp_apply_type_quals_to_decl (cp_type_quals (type
), decl
);
5397 /* Is it valid for this decl to have an initializer at all? */
5399 /* Don't allow initializations for incomplete types except for
5400 arrays which might be completed by the initialization. */
5402 ; /* A complete type is ok. */
5403 else if (type_uses_auto (type
))
5404 ; /* An auto type is ok. */
5405 else if (TREE_CODE (type
) != ARRAY_TYPE
)
5407 error ("variable %q#D has initializer but incomplete type", decl
);
5408 type
= TREE_TYPE (decl
) = error_mark_node
;
5410 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type
))))
5412 if (DECL_LANG_SPECIFIC (decl
) && DECL_TEMPLATE_INFO (decl
))
5413 error ("elements of array %q#D have incomplete type", decl
);
5414 /* else we already gave an error in start_decl. */
5417 else if (aggregate_definition_p
&& !complete_p
)
5419 if (type_uses_auto (type
))
5420 gcc_assert (CLASS_PLACEHOLDER_TEMPLATE (type
));
5423 error ("aggregate %q#D has incomplete type and cannot be defined",
5425 /* Change the type so that assemble_variable will give
5426 DECL an rtl we can live with: (mem (const_int 0)). */
5427 type
= TREE_TYPE (decl
) = error_mark_node
;
5431 /* Create a new scope to hold this declaration if necessary.
5432 Whether or not a new scope is necessary cannot be determined
5433 until after the type has been completed; if the type is a
5434 specialization of a class template it is not until after
5435 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
5436 will be set correctly. */
5437 maybe_push_cleanup_level (type
);
5440 /* Handle initialization of references. DECL, TYPE, and INIT have the
5441 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
5442 but will be set to a new CLEANUP_STMT if a temporary is created
5443 that must be destroyed subsequently.
5445 Returns an initializer expression to use to initialize DECL, or
5446 NULL if the initialization can be performed statically.
5448 Quotes on semantics can be found in ARM 8.4.3. */
5451 grok_reference_init (tree decl
, tree type
, tree init
, int flags
)
5453 if (init
== NULL_TREE
)
5455 if ((DECL_LANG_SPECIFIC (decl
) == 0
5456 || DECL_IN_AGGR_P (decl
) == 0)
5457 && ! DECL_THIS_EXTERN (decl
))
5458 error_at (DECL_SOURCE_LOCATION (decl
),
5459 "%qD declared as reference but not initialized", decl
);
5463 if (TREE_CODE (init
) == TREE_LIST
)
5464 init
= build_x_compound_expr_from_list (init
, ELK_INIT
,
5465 tf_warning_or_error
);
5467 tree ttype
= TREE_TYPE (type
);
5468 if (TREE_CODE (ttype
) != ARRAY_TYPE
5469 && TREE_CODE (TREE_TYPE (init
)) == ARRAY_TYPE
)
5470 /* Note: default conversion is only called in very special cases. */
5471 init
= decay_conversion (init
, tf_warning_or_error
);
5473 /* check_initializer handles this for non-reference variables, but for
5474 references we need to do it here or the initializer will get the
5475 incomplete array type and confuse later calls to
5476 cp_complete_array_type. */
5477 if (TREE_CODE (ttype
) == ARRAY_TYPE
5478 && TYPE_DOMAIN (ttype
) == NULL_TREE
5479 && (BRACE_ENCLOSED_INITIALIZER_P (init
)
5480 || TREE_CODE (init
) == STRING_CST
))
5482 cp_complete_array_type (&ttype
, init
, false);
5483 if (ttype
!= TREE_TYPE (type
))
5484 type
= cp_build_reference_type (ttype
, TYPE_REF_IS_RVALUE (type
));
5487 /* Convert INIT to the reference type TYPE. This may involve the
5488 creation of a temporary, whose lifetime must be the same as that
5489 of the reference. If so, a DECL_EXPR for the temporary will be
5490 added just after the DECL_EXPR for DECL. That's why we don't set
5491 DECL_INITIAL for local references (instead assigning to them
5492 explicitly); we need to allow the temporary to be initialized
5494 return initialize_reference (type
, init
, flags
,
5495 tf_warning_or_error
);
5498 /* Designated initializers in arrays are not supported in GNU C++.
5499 The parser cannot detect this error since it does not know whether
5500 a given brace-enclosed initializer is for a class type or for an
5501 array. This function checks that CE does not use a designated
5502 initializer. If it does, an error is issued. Returns true if CE
5503 is valid, i.e., does not have a designated initializer. */
5506 check_array_designated_initializer (constructor_elt
*ce
,
5507 unsigned HOST_WIDE_INT index
)
5509 /* Designated initializers for array elements are not supported. */
5512 /* The parser only allows identifiers as designated
5514 if (ce
->index
== error_mark_node
)
5516 error ("name used in a GNU-style designated "
5517 "initializer for an array");
5520 else if (identifier_p (ce
->index
))
5522 error ("name %qD used in a GNU-style designated "
5523 "initializer for an array", ce
->index
);
5527 tree ce_index
= build_expr_type_conversion (WANT_INT
| WANT_ENUM
,
5530 && INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (ce_index
))
5531 && (TREE_CODE (ce_index
= fold_non_dependent_expr (ce_index
))
5534 /* A C99 designator is OK if it matches the current index. */
5535 if (wi::to_wide (ce_index
) == index
)
5537 ce
->index
= ce_index
;
5541 sorry ("non-trivial designated initializers not supported");
5544 error_at (cp_expr_loc_or_input_loc (ce
->index
),
5545 "C99 designator %qE is not an integral constant-expression",
5554 /* When parsing `int a[] = {1, 2};' we don't know the size of the
5555 array until we finish parsing the initializer. If that's the
5556 situation we're in, update DECL accordingly. */
5559 maybe_deduce_size_from_array_init (tree decl
, tree init
)
5561 tree type
= TREE_TYPE (decl
);
5563 if (TREE_CODE (type
) == ARRAY_TYPE
5564 && TYPE_DOMAIN (type
) == NULL_TREE
5565 && TREE_CODE (decl
) != TYPE_DECL
)
5567 /* do_default is really a C-ism to deal with tentative definitions.
5568 But let's leave it here to ease the eventual merge. */
5569 int do_default
= !DECL_EXTERNAL (decl
);
5570 tree initializer
= init
? init
: DECL_INITIAL (decl
);
5573 /* Check that there are no designated initializers in INIT, as
5574 those are not supported in GNU C++, and as the middle-end
5575 will crash if presented with a non-numeric designated
5577 if (initializer
&& BRACE_ENCLOSED_INITIALIZER_P (initializer
))
5579 vec
<constructor_elt
, va_gc
> *v
= CONSTRUCTOR_ELTS (initializer
);
5580 constructor_elt
*ce
;
5582 FOR_EACH_VEC_SAFE_ELT (v
, i
, ce
)
5584 if (instantiation_dependent_expression_p (ce
->index
))
5586 if (!check_array_designated_initializer (ce
, i
))
5592 TREE_TYPE (decl
) = error_mark_node
;
5595 failure
= cp_complete_array_type (&TREE_TYPE (decl
), initializer
,
5599 error_at (cp_expr_loc_or_loc (initializer
,
5600 DECL_SOURCE_LOCATION (decl
)),
5601 "initializer fails to determine size of %qD", decl
);
5603 else if (failure
== 2)
5607 error_at (DECL_SOURCE_LOCATION (decl
),
5608 "array size missing in %qD", decl
);
5610 /* If a `static' var's size isn't known, make it extern as
5611 well as static, so it does not get allocated. If it's not
5612 `static', then don't mark it extern; finish_incomplete_decl
5613 will give it a default size and it will get allocated. */
5614 else if (!pedantic
&& TREE_STATIC (decl
) && !TREE_PUBLIC (decl
))
5615 DECL_EXTERNAL (decl
) = 1;
5617 else if (failure
== 3)
5619 error_at (DECL_SOURCE_LOCATION (decl
),
5620 "zero-size array %qD", decl
);
5624 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl
)), decl
);
5626 relayout_decl (decl
);
5630 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
5631 any appropriate error messages regarding the layout. */
5634 layout_var_decl (tree decl
)
5638 type
= TREE_TYPE (decl
);
5639 if (type
== error_mark_node
)
5642 /* If we haven't already laid out this declaration, do so now.
5643 Note that we must not call complete type for an external object
5644 because it's type might involve templates that we are not
5645 supposed to instantiate yet. (And it's perfectly valid to say
5646 `extern X x' for some incomplete type `X'.) */
5647 if (!DECL_EXTERNAL (decl
))
5648 complete_type (type
);
5649 if (!DECL_SIZE (decl
)
5650 && TREE_TYPE (decl
) != error_mark_node
5651 && complete_or_array_type_p (type
))
5652 layout_decl (decl
, 0);
5654 if (!DECL_EXTERNAL (decl
) && DECL_SIZE (decl
) == NULL_TREE
)
5656 /* An automatic variable with an incomplete type: that is an error.
5657 Don't talk about array types here, since we took care of that
5658 message in grokdeclarator. */
5659 error_at (DECL_SOURCE_LOCATION (decl
),
5660 "storage size of %qD isn%'t known", decl
);
5661 TREE_TYPE (decl
) = error_mark_node
;
5664 /* Keep this code around in case we later want to control debug info
5665 based on whether a type is "used". (jason 1999-11-11) */
5667 else if (!DECL_EXTERNAL (decl
) && MAYBE_CLASS_TYPE_P (ttype
))
5668 /* Let debugger know it should output info for this type. */
5669 note_debug_info_needed (ttype
);
5671 if (TREE_STATIC (decl
) && DECL_CLASS_SCOPE_P (decl
))
5672 note_debug_info_needed (DECL_CONTEXT (decl
));
5675 if ((DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
5676 && DECL_SIZE (decl
) != NULL_TREE
5677 && ! TREE_CONSTANT (DECL_SIZE (decl
)))
5679 if (TREE_CODE (DECL_SIZE (decl
)) == INTEGER_CST
)
5680 constant_expression_warning (DECL_SIZE (decl
));
5683 error_at (DECL_SOURCE_LOCATION (decl
),
5684 "storage size of %qD isn%'t constant", decl
);
5685 TREE_TYPE (decl
) = error_mark_node
;
5690 /* If a local static variable is declared in an inline function, or if
5691 we have a weak definition, we must endeavor to create only one
5692 instance of the variable at link-time. */
5695 maybe_commonize_var (tree decl
)
5697 /* Don't mess with __FUNCTION__ and similar. */
5698 if (DECL_ARTIFICIAL (decl
))
5701 /* Static data in a function with comdat linkage also has comdat
5703 if ((TREE_STATIC (decl
)
5704 && DECL_FUNCTION_SCOPE_P (decl
)
5705 && vague_linkage_p (DECL_CONTEXT (decl
)))
5706 || (TREE_PUBLIC (decl
) && DECL_INLINE_VAR_P (decl
)))
5710 /* With weak symbols, we simply make the variable COMDAT;
5711 that will cause copies in multiple translations units to
5713 comdat_linkage (decl
);
5717 if (DECL_INITIAL (decl
) == NULL_TREE
5718 || DECL_INITIAL (decl
) == error_mark_node
)
5720 /* Without weak symbols, we can use COMMON to merge
5721 uninitialized variables. */
5722 TREE_PUBLIC (decl
) = 1;
5723 DECL_COMMON (decl
) = 1;
5727 /* While for initialized variables, we must use internal
5728 linkage -- which means that multiple copies will not
5730 TREE_PUBLIC (decl
) = 0;
5731 DECL_COMMON (decl
) = 0;
5732 DECL_INTERFACE_KNOWN (decl
) = 1;
5734 if (DECL_INLINE_VAR_P (decl
))
5735 msg
= G_("sorry: semantics of inline variable "
5736 "%q#D are wrong (you%'ll wind up with "
5737 "multiple copies)");
5739 msg
= G_("sorry: semantics of inline function "
5740 "static data %q#D are wrong (you%'ll wind "
5741 "up with multiple copies)");
5742 if (warning_at (DECL_SOURCE_LOCATION (decl
), 0,
5744 inform (DECL_SOURCE_LOCATION (decl
),
5745 "you can work around this by removing the initializer");
5751 /* Issue an error message if DECL is an uninitialized const variable.
5752 CONSTEXPR_CONTEXT_P is true when the function is called in a constexpr
5753 context from potential_constant_expression. Returns true if all is well,
5757 check_for_uninitialized_const_var (tree decl
, bool constexpr_context_p
,
5758 tsubst_flags_t complain
)
5760 tree type
= strip_array_types (TREE_TYPE (decl
));
5762 /* ``Unless explicitly declared extern, a const object does not have
5763 external linkage and must be initialized. ($8.4; $12.1)'' ARM
5766 && !TYPE_REF_P (type
)
5767 && (constexpr_context_p
5768 || CP_TYPE_CONST_P (type
) || var_in_constexpr_fn (decl
))
5769 && !DECL_NONTRIVIALLY_INITIALIZED_P (decl
))
5771 tree field
= default_init_uninitialized_part (type
);
5775 bool show_notes
= true;
5777 if (!constexpr_context_p
)
5779 if (CP_TYPE_CONST_P (type
))
5781 if (complain
& tf_error
)
5782 show_notes
= permerror (DECL_SOURCE_LOCATION (decl
),
5783 "uninitialized %<const %D%>", decl
);
5787 if (!is_instantiation_of_constexpr (current_function_decl
)
5788 && (complain
& tf_error
))
5789 error_at (DECL_SOURCE_LOCATION (decl
),
5790 "uninitialized variable %qD in %<constexpr%> "
5794 cp_function_chain
->invalid_constexpr
= true;
5797 else if (complain
& tf_error
)
5798 error_at (DECL_SOURCE_LOCATION (decl
),
5799 "uninitialized variable %qD in %<constexpr%> context",
5802 if (show_notes
&& CLASS_TYPE_P (type
) && (complain
& tf_error
))
5804 tree defaulted_ctor
;
5806 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (type
)),
5807 "%q#T has no user-provided default constructor", type
);
5808 defaulted_ctor
= in_class_defaulted_default_constructor (type
);
5810 inform (DECL_SOURCE_LOCATION (defaulted_ctor
),
5811 "constructor is not user-provided because it is "
5812 "explicitly defaulted in the class body");
5813 inform (DECL_SOURCE_LOCATION (field
),
5814 "and the implicitly-defined constructor does not "
5815 "initialize %q#D", field
);
5824 /* Structure holding the current initializer being processed by reshape_init.
5825 CUR is a pointer to the current element being processed, END is a pointer
5826 after the last element present in the initializer. */
5829 constructor_elt
*cur
;
5830 constructor_elt
*end
;
5833 static tree
reshape_init_r (tree
, reshape_iter
*, bool, tsubst_flags_t
);
5835 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
5836 returned is the next FIELD_DECL (possibly FIELD itself) that can be
5837 initialized. If there are no more such fields, the return value
5841 next_initializable_field (tree field
)
5844 && (TREE_CODE (field
) != FIELD_DECL
5845 || DECL_UNNAMED_BIT_FIELD (field
)
5846 || (DECL_ARTIFICIAL (field
)
5847 && !(cxx_dialect
>= cxx17
&& DECL_FIELD_IS_BASE (field
)))))
5848 field
= DECL_CHAIN (field
);
5853 /* Return true for [dcl.init.list] direct-list-initialization from
5854 single element of enumeration with a fixed underlying type. */
5857 is_direct_enum_init (tree type
, tree init
)
5859 if (cxx_dialect
>= cxx17
5860 && TREE_CODE (type
) == ENUMERAL_TYPE
5861 && ENUM_FIXED_UNDERLYING_TYPE_P (type
)
5862 && TREE_CODE (init
) == CONSTRUCTOR
5863 && CONSTRUCTOR_IS_DIRECT_INIT (init
)
5864 && CONSTRUCTOR_NELTS (init
) == 1)
5869 /* Subroutine of reshape_init_array and reshape_init_vector, which does
5870 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
5871 INTEGER_CST representing the size of the array minus one (the maximum index),
5872 or NULL_TREE if the array was declared without specifying the size. D is
5873 the iterator within the constructor. */
5876 reshape_init_array_1 (tree elt_type
, tree max_index
, reshape_iter
*d
,
5877 tsubst_flags_t complain
)
5880 bool sized_array_p
= (max_index
&& TREE_CONSTANT (max_index
));
5881 unsigned HOST_WIDE_INT max_index_cst
= 0;
5882 unsigned HOST_WIDE_INT index
;
5884 /* The initializer for an array is always a CONSTRUCTOR. */
5885 new_init
= build_constructor (init_list_type_node
, NULL
);
5889 /* Minus 1 is used for zero sized arrays. */
5890 if (integer_all_onesp (max_index
))
5893 if (tree_fits_uhwi_p (max_index
))
5894 max_index_cst
= tree_to_uhwi (max_index
);
5895 /* sizetype is sign extended, not zero extended. */
5897 max_index_cst
= tree_to_uhwi (fold_convert (size_type_node
, max_index
));
5900 /* Set to the index of the last element with a non-zero initializer.
5901 Zero initializers for elements past this one can be dropped. */
5902 unsigned HOST_WIDE_INT last_nonzero
= -1;
5903 /* Loop until there are no more initializers. */
5905 d
->cur
!= d
->end
&& (!sized_array_p
|| index
<= max_index_cst
);
5909 constructor_elt
*old_cur
= d
->cur
;
5911 check_array_designated_initializer (d
->cur
, index
);
5912 elt_init
= reshape_init_r (elt_type
, d
, /*first_initializer_p=*/false,
5914 if (elt_init
== error_mark_node
)
5915 return error_mark_node
;
5916 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init
),
5917 size_int (index
), elt_init
);
5918 if (!TREE_CONSTANT (elt_init
))
5919 TREE_CONSTANT (new_init
) = false;
5921 /* Pointers initialized to strings must be treated as non-zero
5922 even if the string is empty. */
5923 tree init_type
= TREE_TYPE (elt_init
);
5924 if ((POINTER_TYPE_P (elt_type
) != POINTER_TYPE_P (init_type
)))
5925 last_nonzero
= index
;
5926 else if (!type_initializer_zero_p (elt_type
, elt_init
))
5927 last_nonzero
= index
;
5929 /* This can happen with an invalid initializer (c++/54501). */
5930 if (d
->cur
== old_cur
&& !sized_array_p
)
5934 if (sized_array_p
&& trivial_type_p (elt_type
))
5936 /* Strip trailing zero-initializers from an array of a trivial
5937 type of known size. They are redundant and get in the way
5938 of telling them apart from those with implicit zero value. */
5939 unsigned HOST_WIDE_INT nelts
= CONSTRUCTOR_NELTS (new_init
);
5940 if (last_nonzero
> nelts
)
5942 else if (last_nonzero
< nelts
- 1)
5943 nelts
= last_nonzero
+ 1;
5945 vec_safe_truncate (CONSTRUCTOR_ELTS (new_init
), nelts
);
5951 /* Subroutine of reshape_init_r, processes the initializers for arrays.
5952 Parameters are the same of reshape_init_r. */
5955 reshape_init_array (tree type
, reshape_iter
*d
, tsubst_flags_t complain
)
5957 tree max_index
= NULL_TREE
;
5959 gcc_assert (TREE_CODE (type
) == ARRAY_TYPE
);
5961 if (TYPE_DOMAIN (type
))
5962 max_index
= array_type_nelts (type
);
5964 return reshape_init_array_1 (TREE_TYPE (type
), max_index
, d
, complain
);
5967 /* Subroutine of reshape_init_r, processes the initializers for vectors.
5968 Parameters are the same of reshape_init_r. */
5971 reshape_init_vector (tree type
, reshape_iter
*d
, tsubst_flags_t complain
)
5973 tree max_index
= NULL_TREE
;
5975 gcc_assert (VECTOR_TYPE_P (type
));
5977 if (COMPOUND_LITERAL_P (d
->cur
->value
))
5979 tree value
= d
->cur
->value
;
5980 if (!same_type_p (TREE_TYPE (value
), type
))
5982 if (complain
& tf_error
)
5983 error ("invalid type %qT as initializer for a vector of type %qT",
5984 TREE_TYPE (d
->cur
->value
), type
);
5985 value
= error_mark_node
;
5991 /* For a vector, we initialize it as an array of the appropriate size. */
5992 if (VECTOR_TYPE_P (type
))
5993 max_index
= size_int (TYPE_VECTOR_SUBPARTS (type
) - 1);
5995 return reshape_init_array_1 (TREE_TYPE (type
), max_index
, d
, complain
);
5998 /* Subroutine of reshape_init_r, processes the initializers for classes
5999 or union. Parameters are the same of reshape_init_r. */
6002 reshape_init_class (tree type
, reshape_iter
*d
, bool first_initializer_p
,
6003 tsubst_flags_t complain
)
6008 gcc_assert (CLASS_TYPE_P (type
));
6010 /* The initializer for a class is always a CONSTRUCTOR. */
6011 new_init
= build_constructor (init_list_type_node
, NULL
);
6012 field
= next_initializable_field (TYPE_FIELDS (type
));
6018 An initializer for an aggregate member that is an
6019 empty class shall have the form of an empty
6020 initializer-list {}. */
6021 if (!first_initializer_p
)
6023 if (complain
& tf_error
)
6024 error ("initializer for %qT must be brace-enclosed", type
);
6025 return error_mark_node
;
6030 /* Loop through the initializable fields, gathering initializers. */
6031 while (d
->cur
!= d
->end
)
6034 constructor_elt
*old_cur
= d
->cur
;
6036 /* Handle designated initializers, as an extension. */
6039 if (d
->cur
->index
== error_mark_node
)
6040 return error_mark_node
;
6042 if (TREE_CODE (d
->cur
->index
) == FIELD_DECL
)
6044 /* We already reshaped this. */
6045 if (field
!= d
->cur
->index
)
6047 tree id
= DECL_NAME (d
->cur
->index
);
6049 gcc_checking_assert (d
->cur
->index
6050 == get_class_binding (type
, id
));
6051 field
= d
->cur
->index
;
6054 else if (TREE_CODE (d
->cur
->index
) == IDENTIFIER_NODE
)
6055 field
= get_class_binding (type
, d
->cur
->index
);
6058 if (complain
& tf_error
)
6059 error ("%<[%E] =%> used in a GNU-style designated initializer"
6060 " for class %qT", d
->cur
->index
, type
);
6061 return error_mark_node
;
6064 if (!field
|| TREE_CODE (field
) != FIELD_DECL
)
6066 if (complain
& tf_error
)
6067 error ("%qT has no non-static data member named %qD", type
,
6069 return error_mark_node
;
6073 /* If we processed all the member of the class, we are done. */
6077 field_init
= reshape_init_r (TREE_TYPE (field
), d
,
6078 /*first_initializer_p=*/false, complain
);
6079 if (field_init
== error_mark_node
)
6080 return error_mark_node
;
6082 if (d
->cur
== old_cur
&& d
->cur
->index
)
6084 /* This can happen with an invalid initializer for a flexible
6085 array member (c++/54441). */
6086 if (complain
& tf_error
)
6087 error ("invalid initializer for %q#D", field
);
6088 return error_mark_node
;
6091 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init
), field
, field_init
);
6095 When a union is initialized with a brace-enclosed
6096 initializer, the braces shall only contain an
6097 initializer for the first member of the union. */
6098 if (TREE_CODE (type
) == UNION_TYPE
)
6101 field
= next_initializable_field (DECL_CHAIN (field
));
6107 /* Subroutine of reshape_init_r. We're in a context where C99 initializer
6108 designators are not valid; either complain or return true to indicate
6109 that reshape_init_r should return error_mark_node. */
6112 has_designator_problem (reshape_iter
*d
, tsubst_flags_t complain
)
6116 if (complain
& tf_error
)
6117 error_at (cp_expr_loc_or_input_loc (d
->cur
->index
),
6118 "C99 designator %qE outside aggregate initializer",
6126 /* Subroutine of reshape_init, which processes a single initializer (part of
6127 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
6128 iterator within the CONSTRUCTOR which points to the initializer to process.
6129 FIRST_INITIALIZER_P is true if this is the first initializer of the
6130 outermost CONSTRUCTOR node. */
6133 reshape_init_r (tree type
, reshape_iter
*d
, bool first_initializer_p
,
6134 tsubst_flags_t complain
)
6136 tree init
= d
->cur
->value
;
6138 if (error_operand_p (init
))
6139 return error_mark_node
;
6141 if (first_initializer_p
&& !CP_AGGREGATE_TYPE_P (type
)
6142 && has_designator_problem (d
, complain
))
6143 return error_mark_node
;
6145 tree stripped_init
= tree_strip_any_location_wrapper (init
);
6147 if (TREE_CODE (type
) == COMPLEX_TYPE
)
6149 /* A complex type can be initialized from one or two initializers,
6150 but braces are not elided. */
6152 if (BRACE_ENCLOSED_INITIALIZER_P (stripped_init
))
6154 if (CONSTRUCTOR_NELTS (stripped_init
) > 2)
6156 if (complain
& tf_error
)
6157 error ("too many initializers for %qT", type
);
6159 return error_mark_node
;
6162 else if (first_initializer_p
&& d
->cur
!= d
->end
)
6164 vec
<constructor_elt
, va_gc
> *v
= 0;
6165 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, init
);
6166 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, d
->cur
->value
);
6167 if (has_designator_problem (d
, complain
))
6168 return error_mark_node
;
6170 init
= build_constructor (init_list_type_node
, v
);
6175 /* A non-aggregate type is always initialized with a single
6177 if (!CP_AGGREGATE_TYPE_P (type
))
6179 /* It is invalid to initialize a non-aggregate type with a
6180 brace-enclosed initializer before C++0x.
6181 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
6182 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
6183 a CONSTRUCTOR (with a record type). */
6184 if (TREE_CODE (stripped_init
) == CONSTRUCTOR
6185 /* Don't complain about a capture-init. */
6186 && !CONSTRUCTOR_IS_DIRECT_INIT (stripped_init
)
6187 && BRACE_ENCLOSED_INITIALIZER_P (stripped_init
)) /* p7626.C */
6189 if (SCALAR_TYPE_P (type
))
6191 if (cxx_dialect
< cxx11
)
6193 if (complain
& tf_error
)
6194 error ("braces around scalar initializer for type %qT",
6196 init
= error_mark_node
;
6198 else if (first_initializer_p
6199 || (CONSTRUCTOR_NELTS (stripped_init
) > 0
6200 && (BRACE_ENCLOSED_INITIALIZER_P
6201 (CONSTRUCTOR_ELT (stripped_init
,0)->value
))))
6203 if (complain
& tf_error
)
6204 error ("too many braces around scalar initializer"
6205 "for type %qT", type
);
6206 init
= error_mark_node
;
6210 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS
);
6217 /* "If T is a class type and the initializer list has a single element of
6218 type cv U, where U is T or a class derived from T, the object is
6219 initialized from that element." Even if T is an aggregate. */
6220 if (cxx_dialect
>= cxx11
&& (CLASS_TYPE_P (type
) || VECTOR_TYPE_P (type
))
6221 && first_initializer_p
6222 && d
->end
- d
->cur
== 1
6223 && reference_related_p (type
, TREE_TYPE (init
)))
6231 All implicit type conversions (clause _conv_) are considered when
6232 initializing the aggregate member with an initializer from an
6233 initializer-list. If the initializer can initialize a member,
6234 the member is initialized. Otherwise, if the member is itself a
6235 non-empty subaggregate, brace elision is assumed and the
6236 initializer is considered for the initialization of the first
6237 member of the subaggregate. */
6238 if (TREE_CODE (init
) != CONSTRUCTOR
6239 /* But don't try this for the first initializer, since that would be
6240 looking through the outermost braces; A a2 = { a1 }; is not a
6241 valid aggregate initialization. */
6242 && !first_initializer_p
6243 && (same_type_ignoring_top_level_qualifiers_p (type
, TREE_TYPE (init
))
6244 || can_convert_arg (type
, TREE_TYPE (init
), init
, LOOKUP_NORMAL
,
6251 /* [dcl.init.string]
6253 A char array (whether plain char, signed char, or unsigned char)
6254 can be initialized by a string-literal (optionally enclosed in
6255 braces); a wchar_t array can be initialized by a wide
6256 string-literal (optionally enclosed in braces). */
6257 if (TREE_CODE (type
) == ARRAY_TYPE
6258 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type
))))
6260 tree str_init
= init
;
6261 tree stripped_str_init
= stripped_init
;
6263 /* Strip one level of braces if and only if they enclose a single
6264 element (as allowed by [dcl.init.string]). */
6265 if (!first_initializer_p
6266 && TREE_CODE (stripped_str_init
) == CONSTRUCTOR
6267 && CONSTRUCTOR_NELTS (stripped_str_init
) == 1)
6269 str_init
= (*CONSTRUCTOR_ELTS (stripped_str_init
))[0].value
;
6270 stripped_str_init
= tree_strip_any_location_wrapper (str_init
);
6273 /* If it's a string literal, then it's the initializer for the array
6274 as a whole. Otherwise, continue with normal initialization for
6275 array types (one value per array element). */
6276 if (TREE_CODE (stripped_str_init
) == STRING_CST
)
6278 if (has_designator_problem (d
, complain
))
6279 return error_mark_node
;
6285 /* The following cases are about aggregates. If we are not within a full
6286 initializer already, and there is not a CONSTRUCTOR, it means that there
6287 is a missing set of braces (that is, we are processing the case for
6288 which reshape_init exists). */
6289 if (!first_initializer_p
)
6291 if (TREE_CODE (stripped_init
) == CONSTRUCTOR
)
6293 tree init_type
= TREE_TYPE (init
);
6294 if (init_type
&& TYPE_PTRMEMFUNC_P (init_type
))
6295 /* There is no need to call reshape_init for pointer-to-member
6296 function initializers, as they are always constructed correctly
6297 by the front end. Here we have e.g. {.__pfn=0B, .__delta=0},
6298 which is missing outermost braces. We should warn below, and
6299 one of the routines below will wrap it in additional { }. */;
6300 /* For a nested compound literal, there is no need to reshape since
6301 we called reshape_init in finish_compound_literal, before calling
6303 else if (COMPOUND_LITERAL_P (stripped_init
)
6304 /* Similarly, a CONSTRUCTOR of the target's type is a
6305 previously digested initializer. */
6306 || same_type_ignoring_top_level_qualifiers_p (type
,
6310 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (stripped_init
));
6315 /* Something that hasn't been reshaped yet. */
6317 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (stripped_init
));
6318 return reshape_init (type
, init
, complain
);
6322 if (complain
& tf_warning
)
6323 warning (OPT_Wmissing_braces
,
6324 "missing braces around initializer for %qT",
6328 /* Dispatch to specialized routines. */
6329 if (CLASS_TYPE_P (type
))
6330 return reshape_init_class (type
, d
, first_initializer_p
, complain
);
6331 else if (TREE_CODE (type
) == ARRAY_TYPE
)
6332 return reshape_init_array (type
, d
, complain
);
6333 else if (VECTOR_TYPE_P (type
))
6334 return reshape_init_vector (type
, d
, complain
);
6339 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
6340 brace-enclosed aggregate initializer.
6342 INIT is the CONSTRUCTOR containing the list of initializers describing
6343 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
6344 It may not presently match the shape of the TYPE; for example:
6346 struct S { int a; int b; };
6347 struct S a[] = { 1, 2, 3, 4 };
6349 Here INIT will hold a vector of four elements, rather than a
6350 vector of two elements, each itself a vector of two elements. This
6351 routine transforms INIT from the former form into the latter. The
6352 revised CONSTRUCTOR node is returned. */
6355 reshape_init (tree type
, tree init
, tsubst_flags_t complain
)
6357 vec
<constructor_elt
, va_gc
> *v
;
6361 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init
));
6363 v
= CONSTRUCTOR_ELTS (init
);
6365 /* An empty constructor does not need reshaping, and it is always a valid
6367 if (vec_safe_is_empty (v
))
6370 /* Handle [dcl.init.list] direct-list-initialization from
6371 single element of enumeration with a fixed underlying type. */
6372 if (is_direct_enum_init (type
, init
))
6374 tree elt
= CONSTRUCTOR_ELT (init
, 0)->value
;
6375 type
= cv_unqualified (type
);
6376 if (check_narrowing (ENUM_UNDERLYING_TYPE (type
), elt
, complain
))
6378 warning_sentinel
w (warn_useless_cast
);
6379 warning_sentinel
w2 (warn_ignored_qualifiers
);
6380 return cp_build_c_cast (type
, elt
, tf_warning_or_error
);
6383 return error_mark_node
;
6386 /* Recurse on this CONSTRUCTOR. */
6388 d
.end
= d
.cur
+ v
->length ();
6390 new_init
= reshape_init_r (type
, &d
, true, complain
);
6391 if (new_init
== error_mark_node
)
6392 return error_mark_node
;
6394 /* Make sure all the element of the constructor were used. Otherwise,
6395 issue an error about exceeding initializers. */
6398 if (complain
& tf_error
)
6399 error ("too many initializers for %qT", type
);
6400 return error_mark_node
;
6403 if (CONSTRUCTOR_IS_DIRECT_INIT (init
)
6404 && BRACE_ENCLOSED_INITIALIZER_P (new_init
))
6405 CONSTRUCTOR_IS_DIRECT_INIT (new_init
) = true;
6406 if (CONSTRUCTOR_IS_DESIGNATED_INIT (init
)
6407 && BRACE_ENCLOSED_INITIALIZER_P (new_init
))
6408 CONSTRUCTOR_IS_DESIGNATED_INIT (new_init
) = true;
6413 /* Verify array initializer. Returns true if errors have been reported. */
6416 check_array_initializer (tree decl
, tree type
, tree init
)
6418 tree element_type
= TREE_TYPE (type
);
6420 /* The array type itself need not be complete, because the
6421 initializer may tell us how many elements are in the array.
6422 But, the elements of the array must be complete. */
6423 if (!COMPLETE_TYPE_P (complete_type (element_type
)))
6426 error_at (DECL_SOURCE_LOCATION (decl
),
6427 "elements of array %q#D have incomplete type", decl
);
6429 error ("elements of array %q#T have incomplete type", type
);
6432 /* A compound literal can't have variable size. */
6434 && ((COMPLETE_TYPE_P (type
) && !TREE_CONSTANT (TYPE_SIZE (type
)))
6435 || !TREE_CONSTANT (TYPE_SIZE (element_type
))))
6437 error ("variable-sized compound literal");
6443 /* Subroutine of check_initializer; args are passed down from that function.
6444 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
6447 build_aggr_init_full_exprs (tree decl
, tree init
, int flags
)
6450 gcc_assert (stmts_are_full_exprs_p ());
6451 return build_aggr_init (decl
, init
, flags
, tf_warning_or_error
);
6454 /* Verify INIT (the initializer for DECL), and record the
6455 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
6456 grok_reference_init.
6458 If the return value is non-NULL, it is an expression that must be
6459 evaluated dynamically to initialize DECL. */
6462 check_initializer (tree decl
, tree init
, int flags
, vec
<tree
, va_gc
> **cleanups
)
6465 tree init_code
= NULL
;
6468 /* Things that are going to be initialized need to have complete
6470 TREE_TYPE (decl
) = type
= complete_type (TREE_TYPE (decl
));
6472 if (DECL_HAS_VALUE_EXPR_P (decl
))
6474 /* A variable with DECL_HAS_VALUE_EXPR_P set is just a placeholder,
6475 it doesn't have storage to be initialized. */
6476 gcc_assert (init
== NULL_TREE
);
6480 if (type
== error_mark_node
)
6481 /* We will have already complained. */
6484 if (TREE_CODE (type
) == ARRAY_TYPE
)
6486 if (check_array_initializer (decl
, type
, init
))
6489 else if (!COMPLETE_TYPE_P (type
))
6491 error_at (DECL_SOURCE_LOCATION (decl
),
6492 "%q#D has incomplete type", decl
);
6493 TREE_TYPE (decl
) = error_mark_node
;
6497 /* There is no way to make a variable-sized class type in GNU C++. */
6498 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type
)));
6500 if (init
&& BRACE_ENCLOSED_INITIALIZER_P (init
))
6502 int init_len
= CONSTRUCTOR_NELTS (init
);
6503 if (SCALAR_TYPE_P (type
))
6507 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS
);
6508 init
= build_zero_init (type
, NULL_TREE
, false);
6510 else if (init_len
!= 1 && TREE_CODE (type
) != COMPLEX_TYPE
)
6512 error_at (cp_expr_loc_or_loc (init
, DECL_SOURCE_LOCATION (decl
)),
6513 "scalar object %qD requires one element in "
6514 "initializer", decl
);
6515 TREE_TYPE (decl
) = error_mark_node
;
6521 if (TREE_CODE (decl
) == CONST_DECL
)
6523 gcc_assert (!TYPE_REF_P (type
));
6525 DECL_INITIAL (decl
) = init
;
6527 gcc_assert (init
!= NULL_TREE
);
6530 else if (!init
&& DECL_REALLY_EXTERN (decl
))
6532 else if (init
|| type_build_ctor_call (type
)
6533 || TYPE_REF_P (type
))
6535 if (TYPE_REF_P (type
))
6537 init
= grok_reference_init (decl
, type
, init
, flags
);
6538 flags
|= LOOKUP_ALREADY_DIGESTED
;
6541 check_for_uninitialized_const_var (decl
, /*constexpr_context_p=*/false,
6542 tf_warning_or_error
);
6543 /* Do not reshape constructors of vectors (they don't need to be
6545 else if (BRACE_ENCLOSED_INITIALIZER_P (init
))
6547 if (is_std_init_list (type
))
6549 init
= perform_implicit_conversion (type
, init
,
6550 tf_warning_or_error
);
6551 flags
|= LOOKUP_ALREADY_DIGESTED
;
6553 else if (TYPE_NON_AGGREGATE_CLASS (type
))
6555 /* Don't reshape if the class has constructors. */
6556 if (cxx_dialect
== cxx98
)
6557 error_at (cp_expr_loc_or_loc (init
, DECL_SOURCE_LOCATION (decl
)),
6558 "in C++98 %qD must be initialized by "
6559 "constructor, not by %<{...}%>",
6562 else if (VECTOR_TYPE_P (type
) && TYPE_VECTOR_OPAQUE (type
))
6564 error ("opaque vector types cannot be initialized");
6565 init
= error_mark_node
;
6569 init
= reshape_init (type
, init
, tf_warning_or_error
);
6570 flags
|= LOOKUP_NO_NARROWING
;
6573 else if (TREE_CODE (init
) == TREE_LIST
6574 && TREE_TYPE (init
) != unknown_type_node
6575 && !MAYBE_CLASS_TYPE_P (type
))
6577 gcc_assert (TREE_CODE (decl
) != RESULT_DECL
);
6579 /* We get here with code like `int a (2);' */
6580 init
= build_x_compound_expr_from_list (init
, ELK_INIT
,
6581 tf_warning_or_error
);
6584 /* If DECL has an array type without a specific bound, deduce the
6585 array size from the initializer. */
6586 maybe_deduce_size_from_array_init (decl
, init
);
6587 type
= TREE_TYPE (decl
);
6588 if (type
== error_mark_node
)
6591 if (((type_build_ctor_call (type
) || CLASS_TYPE_P (type
))
6592 && !(flags
& LOOKUP_ALREADY_DIGESTED
)
6593 && !(init
&& BRACE_ENCLOSED_INITIALIZER_P (init
)
6594 && CP_AGGREGATE_TYPE_P (type
)
6595 && (CLASS_TYPE_P (type
)
6596 || !TYPE_NEEDS_CONSTRUCTING (type
)
6597 || type_has_extended_temps (type
))))
6598 || (DECL_DECOMPOSITION_P (decl
) && TREE_CODE (type
) == ARRAY_TYPE
))
6600 init_code
= build_aggr_init_full_exprs (decl
, init
, flags
);
6602 /* A constructor call is a non-trivial initializer even if
6603 it isn't explicitly written. */
6604 if (TREE_SIDE_EFFECTS (init_code
))
6605 DECL_NONTRIVIALLY_INITIALIZED_P (decl
) = true;
6607 /* If this is a constexpr initializer, expand_default_init will
6608 have returned an INIT_EXPR rather than a CALL_EXPR. In that
6609 case, pull the initializer back out and pass it down into
6610 store_init_value. */
6611 while (TREE_CODE (init_code
) == EXPR_STMT
6612 || TREE_CODE (init_code
) == CONVERT_EXPR
)
6613 init_code
= TREE_OPERAND (init_code
, 0);
6614 if (TREE_CODE (init_code
) == INIT_EXPR
)
6616 init
= TREE_OPERAND (init_code
, 1);
6617 init_code
= NULL_TREE
;
6618 /* Don't call digest_init; it's unnecessary and will complain
6619 about aggregate initialization of non-aggregate classes. */
6620 flags
|= LOOKUP_ALREADY_DIGESTED
;
6622 else if (DECL_DECLARED_CONSTEXPR_P (decl
)
6623 || (flags
& LOOKUP_CONSTINIT
))
6625 /* Declared constexpr or constinit, but no suitable initializer;
6626 massage init appropriately so we can pass it into
6627 store_init_value for the error. */
6628 if (CLASS_TYPE_P (type
)
6629 && (!init
|| TREE_CODE (init
) == TREE_LIST
))
6631 init
= build_functional_cast (type
, init
, tf_none
);
6632 if (TREE_CODE (init
) == TARGET_EXPR
)
6633 TARGET_EXPR_DIRECT_INIT_P (init
) = true;
6635 init_code
= NULL_TREE
;
6641 if (init
&& TREE_CODE (init
) != TREE_VEC
)
6643 /* In aggregate initialization of a variable, each element
6644 initialization is a full-expression because there is no
6645 enclosing expression. */
6646 gcc_assert (stmts_are_full_exprs_p ());
6648 init_code
= store_init_value (decl
, init
, cleanups
, flags
);
6650 if (DECL_INITIAL (decl
)
6651 && TREE_CODE (DECL_INITIAL (decl
)) == CONSTRUCTOR
6652 && !vec_safe_is_empty (CONSTRUCTOR_ELTS (DECL_INITIAL (decl
))))
6654 tree elt
= CONSTRUCTOR_ELTS (DECL_INITIAL (decl
))->last ().value
;
6655 if (TREE_CODE (TREE_TYPE (elt
)) == ARRAY_TYPE
6656 && TYPE_SIZE (TREE_TYPE (elt
)) == NULL_TREE
)
6657 cp_complete_array_type (&TREE_TYPE (elt
), elt
, false);
6660 if (pedantic
&& TREE_CODE (type
) == ARRAY_TYPE
6661 && DECL_INITIAL (decl
)
6662 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
6663 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl
)))
6664 warning_at (cp_expr_loc_or_loc (DECL_INITIAL (decl
),
6665 DECL_SOURCE_LOCATION (decl
)),
6666 0, "array %qD initialized by parenthesized "
6667 "string literal %qE",
6668 decl
, DECL_INITIAL (decl
));
6674 if (CLASS_TYPE_P (core_type
= strip_array_types (type
))
6675 && (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type
)
6676 || CLASSTYPE_REF_FIELDS_NEED_INIT (core_type
)))
6677 diagnose_uninitialized_cst_or_ref_member (core_type
, /*using_new=*/false,
6680 check_for_uninitialized_const_var (decl
, /*constexpr_context_p=*/false,
6681 tf_warning_or_error
);
6684 if (init
&& init
!= error_mark_node
)
6685 init_code
= build2 (INIT_EXPR
, type
, decl
, init
);
6689 /* We might have set these in cp_finish_decl. */
6690 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
) = false;
6691 TREE_CONSTANT (decl
) = false;
6695 && DECL_IN_AGGR_P (decl
)
6696 && DECL_INITIALIZED_IN_CLASS_P (decl
))
6698 static int explained
= 0;
6700 if (cxx_dialect
< cxx11
)
6701 error ("initializer invalid for static member with constructor");
6702 else if (cxx_dialect
< cxx17
)
6703 error ("non-constant in-class initialization invalid for static "
6704 "member %qD", decl
);
6706 error ("non-constant in-class initialization invalid for non-inline "
6707 "static member %qD", decl
);
6710 inform (input_location
,
6711 "(an out of class initialization is required)");
6720 /* If DECL is not a local variable, give it RTL. */
6723 make_rtl_for_nonlocal_decl (tree decl
, tree init
, const char* asmspec
)
6725 int toplev
= toplevel_bindings_p ();
6728 /* Set the DECL_ASSEMBLER_NAME for the object. */
6731 /* The `register' keyword, when used together with an
6732 asm-specification, indicates that the variable should be
6733 placed in a particular register. */
6734 if (VAR_P (decl
) && DECL_REGISTER (decl
))
6736 set_user_assembler_name (decl
, asmspec
);
6737 DECL_HARD_REGISTER (decl
) = 1;
6741 if (TREE_CODE (decl
) == FUNCTION_DECL
6742 && fndecl_built_in_p (decl
, BUILT_IN_NORMAL
))
6743 set_builtin_user_assembler_name (decl
, asmspec
);
6744 set_user_assembler_name (decl
, asmspec
);
6748 /* Handle non-variables up front. */
6751 rest_of_decl_compilation (decl
, toplev
, at_eof
);
6755 /* If we see a class member here, it should be a static data
6757 if (DECL_LANG_SPECIFIC (decl
) && DECL_IN_AGGR_P (decl
))
6759 gcc_assert (TREE_STATIC (decl
));
6760 /* An in-class declaration of a static data member should be
6761 external; it is only a declaration, and not a definition. */
6762 if (init
== NULL_TREE
)
6763 gcc_assert (DECL_EXTERNAL (decl
)
6764 || !TREE_PUBLIC (decl
));
6767 /* We don't create any RTL for local variables. */
6768 if (DECL_FUNCTION_SCOPE_P (decl
) && !TREE_STATIC (decl
))
6771 /* We defer emission of local statics until the corresponding
6772 DECL_EXPR is expanded. But with constexpr its function might never
6773 be expanded, so go ahead and tell cgraph about the variable now. */
6774 defer_p
= ((DECL_FUNCTION_SCOPE_P (decl
)
6775 && !var_in_maybe_constexpr_fn (decl
))
6776 || DECL_VIRTUAL_P (decl
));
6778 /* Defer template instantiations. */
6779 if (DECL_LANG_SPECIFIC (decl
)
6780 && DECL_IMPLICIT_INSTANTIATION (decl
))
6783 /* If we're not deferring, go ahead and assemble the variable. */
6785 rest_of_decl_compilation (decl
, toplev
, at_eof
);
6788 /* walk_tree helper for wrap_temporary_cleanups, below. */
6791 wrap_cleanups_r (tree
*stmt_p
, int *walk_subtrees
, void *data
)
6793 /* Stop at types or full-expression boundaries. */
6794 if (TYPE_P (*stmt_p
)
6795 || TREE_CODE (*stmt_p
) == CLEANUP_POINT_EXPR
)
6801 if (TREE_CODE (*stmt_p
) == TARGET_EXPR
)
6803 tree guard
= (tree
)data
;
6804 tree tcleanup
= TARGET_EXPR_CLEANUP (*stmt_p
);
6806 tcleanup
= build2 (TRY_CATCH_EXPR
, void_type_node
, tcleanup
, guard
);
6807 /* Tell honor_protect_cleanup_actions to handle this as a separate
6809 TRY_CATCH_IS_CLEANUP (tcleanup
) = 1;
6811 TARGET_EXPR_CLEANUP (*stmt_p
) = tcleanup
;
6817 /* We're initializing a local variable which has a cleanup GUARD. If there
6818 are any temporaries used in the initializer INIT of this variable, we
6819 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
6820 variable will be cleaned up properly if one of them throws.
6822 Unfortunately, there's no way to express this properly in terms of
6823 nesting, as the regions for the temporaries overlap the region for the
6824 variable itself; if there are two temporaries, the variable needs to be
6825 the first thing destroyed if either of them throws. However, we only
6826 want to run the variable's cleanup if it actually got constructed. So
6827 we need to guard the temporary cleanups with the variable's cleanup if
6828 they are run on the normal path, but not if they are run on the
6829 exceptional path. We implement this by telling
6830 honor_protect_cleanup_actions to strip the variable cleanup from the
6831 exceptional path. */
6834 wrap_temporary_cleanups (tree init
, tree guard
)
6836 cp_walk_tree_without_duplicates (&init
, wrap_cleanups_r
, (void *)guard
);
6839 /* Generate code to initialize DECL (a local variable). */
6842 initialize_local_var (tree decl
, tree init
)
6844 tree type
= TREE_TYPE (decl
);
6848 gcc_assert (VAR_P (decl
)
6849 || TREE_CODE (decl
) == RESULT_DECL
);
6850 gcc_assert (!TREE_STATIC (decl
));
6852 if (DECL_SIZE (decl
) == NULL_TREE
)
6854 /* If we used it already as memory, it must stay in memory. */
6855 DECL_INITIAL (decl
) = NULL_TREE
;
6856 TREE_ADDRESSABLE (decl
) = TREE_USED (decl
);
6860 if (type
== error_mark_node
)
6863 /* Compute and store the initial value. */
6864 already_used
= TREE_USED (decl
) || TREE_USED (type
);
6865 if (TREE_USED (type
))
6866 DECL_READ_P (decl
) = 1;
6868 /* Generate a cleanup, if necessary. */
6869 cleanup
= cxx_maybe_build_cleanup (decl
, tf_warning_or_error
);
6871 /* Perform the initialization. */
6874 tree rinit
= (TREE_CODE (init
) == INIT_EXPR
6875 ? TREE_OPERAND (init
, 1) : NULL_TREE
);
6876 if (rinit
&& !TREE_SIDE_EFFECTS (rinit
))
6878 /* Stick simple initializers in DECL_INITIAL so that
6879 -Wno-init-self works (c++/34772). */
6880 gcc_assert (TREE_OPERAND (init
, 0) == decl
);
6881 DECL_INITIAL (decl
) = rinit
;
6883 if (warn_init_self
&& TYPE_REF_P (type
))
6887 warning_at (DECL_SOURCE_LOCATION (decl
),
6889 "reference %qD is initialized with itself", decl
);
6894 int saved_stmts_are_full_exprs_p
;
6896 /* If we're only initializing a single object, guard the
6897 destructors of any temporaries used in its initializer with
6898 its destructor. This isn't right for arrays because each
6899 element initialization is a full-expression. */
6900 if (cleanup
&& TREE_CODE (type
) != ARRAY_TYPE
)
6901 wrap_temporary_cleanups (init
, cleanup
);
6903 gcc_assert (building_stmt_list_p ());
6904 saved_stmts_are_full_exprs_p
= stmts_are_full_exprs_p ();
6905 current_stmt_tree ()->stmts_are_full_exprs_p
= 1;
6906 finish_expr_stmt (init
);
6907 current_stmt_tree ()->stmts_are_full_exprs_p
=
6908 saved_stmts_are_full_exprs_p
;
6912 /* Set this to 0 so we can tell whether an aggregate which was
6913 initialized was ever used. Don't do this if it has a
6914 destructor, so we don't complain about the 'resource
6915 allocation is initialization' idiom. Now set
6916 attribute((unused)) on types so decls of that type will be
6917 marked used. (see TREE_USED, above.) */
6918 if (TYPE_NEEDS_CONSTRUCTING (type
)
6920 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type
)
6921 && DECL_NAME (decl
))
6922 TREE_USED (decl
) = 0;
6923 else if (already_used
)
6924 TREE_USED (decl
) = 1;
6927 finish_decl_cleanup (decl
, cleanup
);
6930 /* DECL is a VAR_DECL for a compiler-generated variable with static
6931 storage duration (like a virtual table) whose initializer is a
6932 compile-time constant. Initialize the variable and provide it to the
6936 initialize_artificial_var (tree decl
, vec
<constructor_elt
, va_gc
> *v
)
6939 gcc_assert (DECL_ARTIFICIAL (decl
));
6940 init
= build_constructor (TREE_TYPE (decl
), v
);
6941 gcc_assert (TREE_CODE (init
) == CONSTRUCTOR
);
6942 DECL_INITIAL (decl
) = init
;
6943 DECL_INITIALIZED_P (decl
) = 1;
6944 /* Mark the decl as constexpr so that we can access its content
6946 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
) = true;
6947 DECL_DECLARED_CONSTEXPR_P (decl
) = true;
6948 determine_visibility (decl
);
6949 layout_var_decl (decl
);
6950 maybe_commonize_var (decl
);
6951 make_rtl_for_nonlocal_decl (decl
, init
, /*asmspec=*/NULL
);
6954 /* INIT is the initializer for a variable, as represented by the
6955 parser. Returns true iff INIT is value-dependent. */
6958 value_dependent_init_p (tree init
)
6960 if (TREE_CODE (init
) == TREE_LIST
)
6961 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
6962 return any_value_dependent_elements_p (init
);
6963 else if (TREE_CODE (init
) == CONSTRUCTOR
)
6964 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
6966 if (dependent_type_p (TREE_TYPE (init
)))
6969 vec
<constructor_elt
, va_gc
> *elts
;
6973 elts
= CONSTRUCTOR_ELTS (init
);
6974 nelts
= vec_safe_length (elts
);
6975 for (i
= 0; i
< nelts
; ++i
)
6976 if (value_dependent_init_p ((*elts
)[i
].value
))
6980 /* It must be a simple expression, e.g., int i = 3; */
6981 return value_dependent_expression_p (init
);
6986 // Returns true if a DECL is VAR_DECL with the concept specifier.
6988 is_concept_var (tree decl
)
6990 return (VAR_P (decl
)
6991 // Not all variables have DECL_LANG_SPECIFIC.
6992 && DECL_LANG_SPECIFIC (decl
)
6993 && DECL_DECLARED_CONCEPT_P (decl
));
6996 /* A helper function to be called via walk_tree. If any label exists
6997 under *TP, it is (going to be) forced. Set has_forced_label_in_static. */
7000 notice_forced_label_r (tree
*tp
, int *walk_subtrees
, void *)
7004 if (TREE_CODE (*tp
) == LABEL_DECL
)
7005 cfun
->has_forced_label_in_static
= 1;
7009 /* Finish processing of a declaration;
7010 install its line number and initial value.
7011 If the length of an array type is not known before,
7012 it must be determined now, from the initial value, or it is an error.
7014 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
7015 true, then INIT is an integral constant expression.
7017 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
7018 if the (init) syntax was used. */
7021 cp_finish_decl (tree decl
, tree init
, bool init_const_expr_p
,
7022 tree asmspec_tree
, int flags
)
7025 vec
<tree
, va_gc
> *cleanups
= NULL
;
7026 const char *asmspec
= NULL
;
7027 int was_readonly
= 0;
7028 bool var_definition_p
= false;
7031 if (decl
== error_mark_node
)
7036 error ("assignment (not initialization) in declaration");
7040 gcc_assert (TREE_CODE (decl
) != RESULT_DECL
);
7041 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
7042 gcc_assert (TREE_CODE (decl
) != PARM_DECL
);
7044 type
= TREE_TYPE (decl
);
7045 if (type
== error_mark_node
)
7048 /* Warn about register storage specifiers except when in GNU global
7049 or local register variable extension. */
7050 if (VAR_P (decl
) && DECL_REGISTER (decl
) && asmspec_tree
== NULL_TREE
)
7052 if (cxx_dialect
>= cxx17
)
7053 pedwarn (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
7054 "ISO C++17 does not allow %<register%> storage "
7057 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
7058 "%<register%> storage class specifier used");
7061 /* If a name was specified, get the string. */
7062 if (at_namespace_scope_p ())
7063 asmspec_tree
= maybe_apply_renaming_pragma (decl
, asmspec_tree
);
7064 if (asmspec_tree
&& asmspec_tree
!= error_mark_node
)
7065 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
7067 if (current_class_type
7068 && CP_DECL_CONTEXT (decl
) == current_class_type
7069 && TYPE_BEING_DEFINED (current_class_type
)
7070 && !CLASSTYPE_TEMPLATE_INSTANTIATION (current_class_type
)
7071 && (DECL_INITIAL (decl
) || init
))
7072 DECL_INITIALIZED_IN_CLASS_P (decl
) = 1;
7074 /* Do auto deduction unless decl is a function or an uninstantiated
7075 template specialization. */
7076 if (TREE_CODE (decl
) != FUNCTION_DECL
7077 && !(init
== NULL_TREE
7078 && DECL_LANG_SPECIFIC (decl
)
7079 && DECL_TEMPLATE_INSTANTIATION (decl
)
7080 && !DECL_TEMPLATE_INSTANTIATED (decl
))
7081 && (auto_node
= type_uses_auto (type
)))
7084 if (init
== NULL_TREE
)
7085 gcc_assert (CLASS_PLACEHOLDER_TEMPLATE (auto_node
));
7089 if (TREE_CODE (d_init
) == TREE_LIST
7090 && !CLASS_PLACEHOLDER_TEMPLATE (auto_node
))
7091 d_init
= build_x_compound_expr_from_list (d_init
, ELK_INIT
,
7092 tf_warning_or_error
);
7093 d_init
= resolve_nondeduced_context (d_init
, tf_warning_or_error
);
7095 enum auto_deduction_context adc
= adc_variable_type
;
7096 if (VAR_P (decl
) && DECL_DECOMPOSITION_P (decl
))
7097 adc
= adc_decomp_type
;
7098 type
= TREE_TYPE (decl
) = do_auto_deduction (type
, d_init
, auto_node
,
7099 tf_warning_or_error
, adc
,
7101 if (type
== error_mark_node
)
7103 if (TREE_CODE (type
) == FUNCTION_TYPE
)
7105 error ("initializer for %<decltype(auto) %D%> has function type; "
7106 "did you forget the %<()%>?", decl
);
7107 TREE_TYPE (decl
) = error_mark_node
;
7110 cp_apply_type_quals_to_decl (cp_type_quals (type
), decl
);
7113 if (ensure_literal_type_for_constexpr_object (decl
) == error_mark_node
)
7115 DECL_DECLARED_CONSTEXPR_P (decl
) = 0;
7116 if (VAR_P (decl
) && DECL_CLASS_SCOPE_P (decl
))
7119 DECL_EXTERNAL (decl
) = 1;
7124 && DECL_CLASS_SCOPE_P (decl
)
7125 && DECL_INITIALIZED_IN_CLASS_P (decl
))
7126 check_static_variable_definition (decl
, type
);
7128 if (init
&& TREE_CODE (decl
) == FUNCTION_DECL
)
7131 if (init
== ridpointers
[(int)RID_DELETE
])
7133 /* FIXME check this is 1st decl. */
7134 DECL_DELETED_FN (decl
) = 1;
7135 DECL_DECLARED_INLINE_P (decl
) = 1;
7136 DECL_INITIAL (decl
) = error_mark_node
;
7137 FOR_EACH_CLONE (clone
, decl
)
7139 DECL_DELETED_FN (clone
) = 1;
7140 DECL_DECLARED_INLINE_P (clone
) = 1;
7141 DECL_INITIAL (clone
) = error_mark_node
;
7145 else if (init
== ridpointers
[(int)RID_DEFAULT
])
7147 if (defaultable_fn_check (decl
))
7148 DECL_DEFAULTED_FN (decl
) = 1;
7150 DECL_INITIAL (decl
) = NULL_TREE
;
7154 if (init
&& VAR_P (decl
))
7156 DECL_NONTRIVIALLY_INITIALIZED_P (decl
) = 1;
7157 /* If DECL is a reference, then we want to know whether init is a
7158 reference constant; init_const_expr_p as passed tells us whether
7159 it's an rvalue constant. */
7160 if (TYPE_REF_P (type
))
7161 init_const_expr_p
= potential_constant_expression (init
);
7162 if (init_const_expr_p
)
7164 /* Set these flags now for templates. We'll update the flags in
7165 store_init_value for instantiations. */
7166 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
) = 1;
7167 if (decl_maybe_constant_var_p (decl
)
7168 /* FIXME setting TREE_CONSTANT on refs breaks the back end. */
7169 && !TYPE_REF_P (type
))
7170 TREE_CONSTANT (decl
) = 1;
7174 if (processing_template_decl
)
7176 bool type_dependent_p
;
7178 /* Add this declaration to the statement-tree. */
7179 if (at_function_scope_p ())
7180 add_decl_expr (decl
);
7182 type_dependent_p
= dependent_type_p (type
);
7184 if (check_for_bare_parameter_packs (init
))
7187 DECL_INITIAL (decl
) = NULL_TREE
;
7190 /* Handle `constinit' on variable templates. */
7191 if (flags
& LOOKUP_CONSTINIT
)
7192 TINFO_VAR_DECLARED_CONSTINIT (DECL_TEMPLATE_INFO (decl
)) = true;
7194 /* Generally, initializers in templates are expanded when the
7195 template is instantiated. But, if DECL is a variable constant
7196 then it can be used in future constant expressions, so its value
7197 must be available. */
7199 bool dep_init
= false;
7201 if (!VAR_P (decl
) || type_dependent_p
)
7202 /* We can't do anything if the decl has dependent type. */;
7203 else if (!init
&& is_concept_var (decl
))
7205 error ("variable concept has no initializer");
7206 init
= boolean_true_node
;
7209 && init_const_expr_p
7210 && !TYPE_REF_P (type
)
7211 && decl_maybe_constant_var_p (decl
)
7212 && !(dep_init
= value_dependent_init_p (init
)))
7214 /* This variable seems to be a non-dependent constant, so process
7215 its initializer. If check_initializer returns non-null the
7216 initialization wasn't constant after all. */
7218 cleanups
= make_tree_vector ();
7219 init_code
= check_initializer (decl
, init
, flags
, &cleanups
);
7220 if (init_code
== NULL_TREE
)
7222 release_tree_vector (cleanups
);
7226 gcc_assert (!DECL_PRETTY_FUNCTION_P (decl
));
7227 /* Deduce array size even if the initializer is dependent. */
7228 maybe_deduce_size_from_array_init (decl
, init
);
7229 /* And complain about multiple initializers. */
7230 if (init
&& TREE_CODE (init
) == TREE_LIST
&& TREE_CHAIN (init
)
7231 && !MAYBE_CLASS_TYPE_P (type
))
7232 init
= build_x_compound_expr_from_list (init
, ELK_INIT
,
7233 tf_warning_or_error
);
7237 DECL_INITIAL (decl
) = init
;
7241 retrofit_lang_decl (decl
);
7242 SET_DECL_DEPENDENT_INIT_P (decl
, true);
7247 /* Just store non-static data member initializers for later. */
7248 if (init
&& TREE_CODE (decl
) == FIELD_DECL
)
7249 DECL_INITIAL (decl
) = init
;
7251 /* Take care of TYPE_DECLs up front. */
7252 if (TREE_CODE (decl
) == TYPE_DECL
)
7254 if (type
!= error_mark_node
7255 && MAYBE_CLASS_TYPE_P (type
) && DECL_NAME (decl
))
7257 if (TREE_TYPE (DECL_NAME (decl
)) && TREE_TYPE (decl
) != type
)
7258 warning (0, "shadowing previous type declaration of %q#D", decl
);
7259 set_identifier_type_value (DECL_NAME (decl
), decl
);
7262 /* If we have installed this as the canonical typedef for this
7263 type, and that type has not been defined yet, delay emitting
7264 the debug information for it, as we will emit it later. */
7265 if (TYPE_MAIN_DECL (TREE_TYPE (decl
)) == decl
7266 && !COMPLETE_TYPE_P (TREE_TYPE (decl
)))
7267 TYPE_DECL_SUPPRESS_DEBUG (decl
) = 1;
7269 rest_of_decl_compilation (decl
, DECL_FILE_SCOPE_P (decl
),
7274 /* A reference will be modified here, as it is initialized. */
7275 if (! DECL_EXTERNAL (decl
)
7276 && TREE_READONLY (decl
)
7277 && TYPE_REF_P (type
))
7280 TREE_READONLY (decl
) = 0;
7285 duration_kind dk
= decl_storage_duration (decl
);
7286 /* [dcl.constinit]/1 "The constinit specifier shall be applied
7287 only to a declaration of a variable with static or thread storage
7289 if ((flags
& LOOKUP_CONSTINIT
)
7290 && !(dk
== dk_thread
|| dk
== dk_static
))
7292 error_at (DECL_SOURCE_LOCATION (decl
),
7293 "%<constinit%> can only be applied to a variable with "
7294 "static or thread storage duration");
7298 /* If this is a local variable that will need a mangled name,
7299 register it now. We must do this before processing the
7300 initializer for the variable, since the initialization might
7301 require a guard variable, and since the mangled name of the
7302 guard variable will depend on the mangled name of this
7304 if (DECL_FUNCTION_SCOPE_P (decl
)
7305 && TREE_STATIC (decl
)
7306 && !DECL_ARTIFICIAL (decl
))
7308 /* The variable holding an anonymous union will have had its
7309 discriminator set in finish_anon_union, after which it's
7310 NAME will have been cleared. */
7311 if (DECL_NAME (decl
))
7312 determine_local_discriminator (decl
);
7313 /* Normally has_forced_label_in_static is set during GIMPLE
7314 lowering, but [cd]tors are never actually compiled directly.
7315 We need to set this early so we can deal with the label
7316 address extension. */
7317 if ((DECL_CONSTRUCTOR_P (current_function_decl
)
7318 || DECL_DESTRUCTOR_P (current_function_decl
))
7321 walk_tree (&init
, notice_forced_label_r
, NULL
, NULL
);
7322 add_local_decl (cfun
, decl
);
7324 /* And make sure it's in the symbol table for
7325 c_parse_final_cleanups to find. */
7326 varpool_node::get_create (decl
);
7329 /* Convert the initializer to the type of DECL, if we have not
7330 already initialized DECL. */
7331 if (!DECL_INITIALIZED_P (decl
)
7332 /* If !DECL_EXTERNAL then DECL is being defined. In the
7333 case of a static data member initialized inside the
7334 class-specifier, there can be an initializer even if DECL
7335 is *not* defined. */
7336 && (!DECL_EXTERNAL (decl
) || init
))
7338 cleanups
= make_tree_vector ();
7339 init
= check_initializer (decl
, init
, flags
, &cleanups
);
7345 The memory occupied by any object of static storage
7346 duration is zero-initialized at program startup before
7347 any other initialization takes place.
7349 We cannot create an appropriate initializer until after
7350 the type of DECL is finalized. If DECL_INITIAL is set,
7351 then the DECL is statically initialized, and any
7352 necessary zero-initialization has already been performed. */
7353 if (TREE_STATIC (decl
) && !DECL_INITIAL (decl
))
7354 DECL_INITIAL (decl
) = build_zero_init (TREE_TYPE (decl
),
7355 /*nelts=*/NULL_TREE
,
7356 /*static_storage_p=*/true);
7357 /* Remember that the initialization for this variable has
7359 DECL_INITIALIZED_P (decl
) = 1;
7360 /* This declaration is the definition of this variable,
7361 unless we are initializing a static data member within
7362 the class specifier. */
7363 if (!DECL_EXTERNAL (decl
))
7364 var_definition_p
= true;
7366 /* If the variable has an array type, lay out the type, even if
7367 there is no initializer. It is valid to index through the
7368 array, and we must get TYPE_ALIGN set correctly on the array
7370 else if (TREE_CODE (type
) == ARRAY_TYPE
)
7373 if (TREE_STATIC (decl
)
7374 && !at_function_scope_p ()
7375 && current_function_decl
== NULL
)
7376 /* So decl is a global variable or a static member of a
7377 non local class. Record the types it uses
7378 so that we can decide later to emit debug info for them. */
7379 record_types_used_by_current_var_decl (decl
);
7382 /* Add this declaration to the statement-tree. This needs to happen
7383 after the call to check_initializer so that the DECL_EXPR for a
7384 reference temp is added before the DECL_EXPR for the reference itself. */
7385 if (DECL_FUNCTION_SCOPE_P (decl
))
7387 /* If we're building a variable sized type, and we might be
7388 reachable other than via the top of the current binding
7389 level, then create a new BIND_EXPR so that we deallocate
7390 the object at the right time. */
7393 && !TREE_CONSTANT (DECL_SIZE (decl
))
7394 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list
))
7397 bind
= build3 (BIND_EXPR
, void_type_node
, NULL
, NULL
, NULL
);
7398 TREE_SIDE_EFFECTS (bind
) = 1;
7400 BIND_EXPR_BODY (bind
) = push_stmt_list ();
7402 add_decl_expr (decl
);
7405 /* Let the middle end know about variables and functions -- but not
7406 static data members in uninstantiated class templates. */
7407 if (VAR_OR_FUNCTION_DECL_P (decl
))
7411 layout_var_decl (decl
);
7412 maybe_commonize_var (decl
);
7415 /* This needs to happen after the linkage is set. */
7416 determine_visibility (decl
);
7418 if (var_definition_p
&& TREE_STATIC (decl
))
7420 /* If a TREE_READONLY variable needs initialization
7421 at runtime, it is no longer readonly and we need to
7422 avoid MEM_READONLY_P being set on RTL created for it. */
7425 if (TREE_READONLY (decl
))
7426 TREE_READONLY (decl
) = 0;
7429 else if (was_readonly
)
7430 TREE_READONLY (decl
) = 1;
7432 /* Likewise if it needs destruction. */
7433 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
))
7434 TREE_READONLY (decl
) = 0;
7437 make_rtl_for_nonlocal_decl (decl
, init
, asmspec
);
7439 /* Check for abstractness of the type. Notice that there is no
7440 need to strip array types here since the check for those types
7441 is already done within create_array_type_for_decl. */
7442 abstract_virtuals_error (decl
, type
);
7444 if (TREE_TYPE (decl
) == error_mark_node
)
7445 /* No initialization required. */
7447 else if (TREE_CODE (decl
) == FUNCTION_DECL
)
7451 if (init
== ridpointers
[(int)RID_DEFAULT
])
7453 /* An out-of-class default definition is defined at
7454 the point where it is explicitly defaulted. */
7455 if (DECL_DELETED_FN (decl
))
7456 maybe_explain_implicit_delete (decl
);
7457 else if (DECL_INITIAL (decl
) == error_mark_node
)
7458 synthesize_method (decl
);
7461 error_at (cp_expr_loc_or_loc (init
,
7462 DECL_SOURCE_LOCATION (decl
)),
7463 "function %q#D is initialized like a variable",
7466 /* else no initialization required. */
7468 else if (DECL_EXTERNAL (decl
)
7469 && ! (DECL_LANG_SPECIFIC (decl
)
7470 && DECL_NOT_REALLY_EXTERN (decl
)))
7472 /* check_initializer will have done any constant initialization. */
7474 /* A variable definition. */
7475 else if (DECL_FUNCTION_SCOPE_P (decl
) && !TREE_STATIC (decl
))
7476 /* Initialize the local variable. */
7477 initialize_local_var (decl
, init
);
7479 /* If a variable is defined, and then a subsequent
7480 definition with external linkage is encountered, we will
7481 get here twice for the same variable. We want to avoid
7482 calling expand_static_init more than once. For variables
7483 that are not static data members, we can call
7484 expand_static_init only when we actually process the
7485 initializer. It is not legal to redeclare a static data
7486 member, so this issue does not arise in that case. */
7487 else if (var_definition_p
&& TREE_STATIC (decl
))
7488 expand_static_init (decl
, init
);
7491 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
7492 reference, insert it in the statement-tree now. */
7496 FOR_EACH_VEC_ELT (*cleanups
, i
, t
)
7497 push_cleanup (decl
, t
, false);
7498 release_tree_vector (cleanups
);
7502 TREE_READONLY (decl
) = 1;
7506 && lookup_attribute ("omp declare target implicit",
7507 DECL_ATTRIBUTES (decl
)))
7509 DECL_ATTRIBUTES (decl
)
7510 = remove_attribute ("omp declare target implicit",
7511 DECL_ATTRIBUTES (decl
));
7512 complete_type (TREE_TYPE (decl
));
7513 if (!cp_omp_mappable_type (TREE_TYPE (decl
)))
7515 error ("%q+D in declare target directive does not have mappable"
7517 cp_omp_emit_unmappable_type_notes (TREE_TYPE (decl
));
7519 else if (!lookup_attribute ("omp declare target",
7520 DECL_ATTRIBUTES (decl
))
7521 && !lookup_attribute ("omp declare target link",
7522 DECL_ATTRIBUTES (decl
)))
7523 DECL_ATTRIBUTES (decl
)
7524 = tree_cons (get_identifier ("omp declare target"),
7525 NULL_TREE
, DECL_ATTRIBUTES (decl
));
7528 invoke_plugin_callbacks (PLUGIN_FINISH_DECL
, decl
);
7531 /* For class TYPE return itself or some its bases that contain
7532 any direct non-static data members. Return error_mark_node if an
7533 error has been diagnosed. */
7536 find_decomp_class_base (location_t loc
, tree type
, tree ret
)
7538 bool member_seen
= false;
7539 for (tree field
= TYPE_FIELDS (type
); field
; field
= DECL_CHAIN (field
))
7540 if (TREE_CODE (field
) != FIELD_DECL
7541 || DECL_ARTIFICIAL (field
)
7542 || DECL_UNNAMED_BIT_FIELD (field
))
7546 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field
)))
7548 if (TREE_CODE (TREE_TYPE (field
)) == RECORD_TYPE
)
7549 error_at (loc
, "cannot decompose class type %qT because it has an "
7550 "anonymous struct member", type
);
7552 error_at (loc
, "cannot decompose class type %qT because it has an "
7553 "anonymous union member", type
);
7554 inform (DECL_SOURCE_LOCATION (field
), "declared here");
7555 return error_mark_node
;
7557 else if (!accessible_p (type
, field
, true))
7559 error_at (loc
, "cannot decompose inaccessible member %qD of %qT",
7561 inform (DECL_SOURCE_LOCATION (field
),
7562 TREE_PRIVATE (field
)
7563 ? G_("declared private here")
7564 : G_("declared protected here"));
7565 return error_mark_node
;
7570 tree base_binfo
, binfo
;
7571 tree orig_ret
= ret
;
7575 for (binfo
= TYPE_BINFO (type
), i
= 0;
7576 BINFO_BASE_ITERATE (binfo
, i
, base_binfo
); i
++)
7578 tree t
= find_decomp_class_base (loc
, TREE_TYPE (base_binfo
), ret
);
7579 if (t
== error_mark_node
)
7580 return error_mark_node
;
7581 if (t
!= NULL_TREE
&& t
!= ret
)
7585 error_at (loc
, "cannot decompose class type %qT: both it and "
7586 "its base class %qT have non-static data members",
7588 return error_mark_node
;
7590 else if (orig_ret
!= NULL_TREE
)
7592 else if (ret
!= NULL_TREE
)
7594 error_at (loc
, "cannot decompose class type %qT: its base "
7595 "classes %qT and %qT have non-static data "
7596 "members", type
, ret
, t
);
7597 return error_mark_node
;
7606 /* Return std::tuple_size<TYPE>::value. */
7609 get_tuple_size (tree type
)
7611 tree args
= make_tree_vec (1);
7612 TREE_VEC_ELT (args
, 0) = type
;
7613 tree inst
= lookup_template_class (tuple_size_identifier
, args
,
7614 /*in_decl*/NULL_TREE
,
7615 /*context*/std_node
,
7616 /*entering_scope*/false, tf_none
);
7617 inst
= complete_type (inst
);
7618 if (inst
== error_mark_node
|| !COMPLETE_TYPE_P (inst
))
7620 tree val
= lookup_qualified_name (inst
, value_identifier
,
7621 /*type*/false, /*complain*/false);
7622 if (TREE_CODE (val
) == VAR_DECL
|| TREE_CODE (val
) == CONST_DECL
)
7623 val
= maybe_constant_value (val
);
7624 if (TREE_CODE (val
) == INTEGER_CST
)
7627 return error_mark_node
;
7630 /* Return std::tuple_element<I,TYPE>::type. */
7633 get_tuple_element_type (tree type
, unsigned i
)
7635 tree args
= make_tree_vec (2);
7636 TREE_VEC_ELT (args
, 0) = build_int_cst (integer_type_node
, i
);
7637 TREE_VEC_ELT (args
, 1) = type
;
7638 tree inst
= lookup_template_class (tuple_element_identifier
, args
,
7639 /*in_decl*/NULL_TREE
,
7640 /*context*/std_node
,
7641 /*entering_scope*/false,
7642 tf_warning_or_error
);
7643 return make_typename_type (inst
, type_identifier
,
7644 none_type
, tf_warning_or_error
);
7647 /* Return e.get<i>() or get<i>(e). */
7650 get_tuple_decomp_init (tree decl
, unsigned i
)
7652 tree targs
= make_tree_vec (1);
7653 TREE_VEC_ELT (targs
, 0) = build_int_cst (integer_type_node
, i
);
7655 tree etype
= TREE_TYPE (decl
);
7656 tree e
= convert_from_reference (decl
);
7658 /* [The id-expression] e is an lvalue if the type of the entity e is an
7659 lvalue reference and an xvalue otherwise. */
7660 if (!TYPE_REF_P (etype
)
7661 || TYPE_REF_IS_RVALUE (etype
))
7664 tree fns
= lookup_qualified_name (TREE_TYPE (e
), get__identifier
,
7665 /*type*/false, /*complain*/false);
7666 bool use_member_get
= false;
7668 /* To use a member get, member lookup must find at least one
7669 declaration that is a function template
7670 whose first template parameter is a non-type parameter. */
7671 for (lkp_iterator
iter (MAYBE_BASELINK_FUNCTIONS (fns
)); iter
; ++iter
)
7674 if (TREE_CODE (fn
) == TEMPLATE_DECL
)
7676 tree tparms
= DECL_TEMPLATE_PARMS (fn
);
7677 tree parm
= TREE_VEC_ELT (INNERMOST_TEMPLATE_PARMS (tparms
), 0);
7678 if (TREE_CODE (TREE_VALUE (parm
)) == PARM_DECL
)
7680 use_member_get
= true;
7688 fns
= lookup_template_function (fns
, targs
);
7689 return build_new_method_call (e
, fns
, /*args*/NULL
,
7690 /*path*/NULL_TREE
, LOOKUP_NORMAL
,
7691 /*fn_p*/NULL
, tf_warning_or_error
);
7695 releasing_vec
args (make_tree_vector_single (e
));
7696 fns
= lookup_template_function (get__identifier
, targs
);
7697 fns
= perform_koenig_lookup (fns
, args
, tf_warning_or_error
);
7698 return finish_call_expr (fns
, &args
, /*novirt*/false,
7699 /*koenig*/true, tf_warning_or_error
);
7703 /* It's impossible to recover the decltype of a tuple decomposition variable
7704 based on the actual type of the variable, so store it in a hash table. */
7706 static GTY((cache
)) tree_cache_map
*decomp_type_table
;
7708 store_decomp_type (tree v
, tree t
)
7710 if (!decomp_type_table
)
7711 decomp_type_table
= tree_cache_map::create_ggc (13);
7712 decomp_type_table
->put (v
, t
);
7716 lookup_decomp_type (tree v
)
7718 return *decomp_type_table
->get (v
);
7721 /* Mangle a decomposition declaration if needed. Arguments like
7722 in cp_finish_decomp. */
7725 cp_maybe_mangle_decomp (tree decl
, tree first
, unsigned int count
)
7727 if (!processing_template_decl
7728 && !error_operand_p (decl
)
7729 && TREE_STATIC (decl
))
7731 auto_vec
<tree
, 16> v
;
7732 v
.safe_grow (count
);
7734 for (unsigned int i
= 0; i
< count
; i
++, d
= DECL_CHAIN (d
))
7735 v
[count
- i
- 1] = d
;
7736 SET_DECL_ASSEMBLER_NAME (decl
, mangle_decomp (decl
, v
));
7737 maybe_apply_pragma_weak (decl
);
7741 /* Finish a decomposition declaration. DECL is the underlying declaration
7742 "e", FIRST is the head of a chain of decls for the individual identifiers
7743 chained through DECL_CHAIN in reverse order and COUNT is the number of
7747 cp_finish_decomp (tree decl
, tree first
, unsigned int count
)
7749 if (error_operand_p (decl
))
7754 TREE_TYPE (first
) = error_mark_node
;
7755 if (DECL_HAS_VALUE_EXPR_P (first
))
7757 SET_DECL_VALUE_EXPR (first
, NULL_TREE
);
7758 DECL_HAS_VALUE_EXPR_P (first
) = 0;
7760 first
= DECL_CHAIN (first
);
7762 if (DECL_P (decl
) && DECL_NAMESPACE_SCOPE_P (decl
))
7763 SET_DECL_ASSEMBLER_NAME (decl
, get_identifier ("<decomp>"));
7767 location_t loc
= DECL_SOURCE_LOCATION (decl
);
7768 if (type_dependent_expression_p (decl
)
7769 /* This happens for range for when not in templates.
7770 Still add the DECL_VALUE_EXPRs for later processing. */
7771 || (!processing_template_decl
7772 && type_uses_auto (TREE_TYPE (decl
))))
7774 for (unsigned int i
= 0; i
< count
; i
++)
7776 if (!DECL_HAS_VALUE_EXPR_P (first
))
7778 tree v
= build_nt (ARRAY_REF
, decl
,
7779 size_int (count
- i
- 1),
7780 NULL_TREE
, NULL_TREE
);
7781 SET_DECL_VALUE_EXPR (first
, v
);
7782 DECL_HAS_VALUE_EXPR_P (first
) = 1;
7784 if (processing_template_decl
)
7785 fit_decomposition_lang_decl (first
, decl
);
7786 first
= DECL_CHAIN (first
);
7791 auto_vec
<tree
, 16> v
;
7792 v
.safe_grow (count
);
7794 for (unsigned int i
= 0; i
< count
; i
++, d
= DECL_CHAIN (d
))
7796 v
[count
- i
- 1] = d
;
7797 fit_decomposition_lang_decl (d
, decl
);
7800 tree type
= TREE_TYPE (decl
);
7803 if (TYPE_REF_P (type
))
7805 dexp
= convert_from_reference (dexp
);
7806 type
= complete_type (TREE_TYPE (type
));
7807 if (type
== error_mark_node
)
7809 if (!COMPLETE_TYPE_P (type
))
7811 error_at (loc
, "structured binding refers to incomplete type %qT",
7817 tree eltype
= NULL_TREE
;
7818 unsigned HOST_WIDE_INT eltscnt
= 0;
7819 if (TREE_CODE (type
) == ARRAY_TYPE
)
7822 nelts
= array_type_nelts_top (type
);
7823 if (nelts
== error_mark_node
)
7825 if (!tree_fits_uhwi_p (nelts
))
7827 error_at (loc
, "cannot decompose variable length array %qT", type
);
7830 eltscnt
= tree_to_uhwi (nelts
);
7831 if (count
!= eltscnt
)
7834 if (count
> eltscnt
)
7835 error_n (loc
, count
,
7836 "%u name provided for structured binding",
7837 "%u names provided for structured binding", count
);
7839 error_n (loc
, count
,
7840 "only %u name provided for structured binding",
7841 "only %u names provided for structured binding", count
);
7842 inform_n (loc
, eltscnt
,
7843 "while %qT decomposes into %wu element",
7844 "while %qT decomposes into %wu elements",
7848 eltype
= TREE_TYPE (type
);
7849 for (unsigned int i
= 0; i
< count
; i
++)
7851 TREE_TYPE (v
[i
]) = eltype
;
7852 layout_decl (v
[i
], 0);
7853 if (processing_template_decl
)
7855 tree t
= unshare_expr (dexp
);
7856 t
= build4_loc (DECL_SOURCE_LOCATION (v
[i
]), ARRAY_REF
,
7857 eltype
, t
, size_int (i
), NULL_TREE
,
7859 SET_DECL_VALUE_EXPR (v
[i
], t
);
7860 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7863 /* 2 GNU extensions. */
7864 else if (TREE_CODE (type
) == COMPLEX_TYPE
)
7867 if (count
!= eltscnt
)
7869 eltype
= cp_build_qualified_type (TREE_TYPE (type
), TYPE_QUALS (type
));
7870 for (unsigned int i
= 0; i
< count
; i
++)
7872 TREE_TYPE (v
[i
]) = eltype
;
7873 layout_decl (v
[i
], 0);
7874 if (processing_template_decl
)
7876 tree t
= unshare_expr (dexp
);
7877 t
= build1_loc (DECL_SOURCE_LOCATION (v
[i
]),
7878 i
? IMAGPART_EXPR
: REALPART_EXPR
, eltype
,
7880 SET_DECL_VALUE_EXPR (v
[i
], t
);
7881 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7884 else if (TREE_CODE (type
) == VECTOR_TYPE
)
7886 if (!TYPE_VECTOR_SUBPARTS (type
).is_constant (&eltscnt
))
7888 error_at (loc
, "cannot decompose variable length vector %qT", type
);
7891 if (count
!= eltscnt
)
7893 eltype
= cp_build_qualified_type (TREE_TYPE (type
), TYPE_QUALS (type
));
7894 for (unsigned int i
= 0; i
< count
; i
++)
7896 TREE_TYPE (v
[i
]) = eltype
;
7897 layout_decl (v
[i
], 0);
7898 if (processing_template_decl
)
7900 tree t
= unshare_expr (dexp
);
7901 convert_vector_to_array_for_subscript (DECL_SOURCE_LOCATION (v
[i
]),
7903 t
= build4_loc (DECL_SOURCE_LOCATION (v
[i
]), ARRAY_REF
,
7904 eltype
, t
, size_int (i
), NULL_TREE
,
7906 SET_DECL_VALUE_EXPR (v
[i
], t
);
7907 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7910 else if (tree tsize
= get_tuple_size (type
))
7912 if (tsize
== error_mark_node
)
7914 error_at (loc
, "%<std::tuple_size<%T>::value%> is not an integral "
7915 "constant expression", type
);
7918 if (!tree_fits_uhwi_p (tsize
))
7920 error_n (loc
, count
,
7921 "%u name provided for structured binding",
7922 "%u names provided for structured binding", count
);
7923 inform (loc
, "while %qT decomposes into %E elements",
7927 eltscnt
= tree_to_uhwi (tsize
);
7928 if (count
!= eltscnt
)
7930 int save_read
= DECL_READ_P (decl
);
7931 for (unsigned i
= 0; i
< count
; ++i
)
7933 location_t sloc
= input_location
;
7934 location_t dloc
= DECL_SOURCE_LOCATION (v
[i
]);
7936 input_location
= dloc
;
7937 tree init
= get_tuple_decomp_init (decl
, i
);
7938 tree eltype
= (init
== error_mark_node
? error_mark_node
7939 : get_tuple_element_type (type
, i
));
7940 input_location
= sloc
;
7942 if (init
== error_mark_node
|| eltype
== error_mark_node
)
7944 inform (dloc
, "in initialization of structured binding "
7945 "variable %qD", v
[i
]);
7948 /* Save the decltype away before reference collapse. */
7949 store_decomp_type (v
[i
], eltype
);
7950 eltype
= cp_build_reference_type (eltype
, !lvalue_p (init
));
7951 TREE_TYPE (v
[i
]) = eltype
;
7952 layout_decl (v
[i
], 0);
7953 if (DECL_HAS_VALUE_EXPR_P (v
[i
]))
7955 /* In this case the names are variables, not just proxies. */
7956 SET_DECL_VALUE_EXPR (v
[i
], NULL_TREE
);
7957 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 0;
7959 if (!processing_template_decl
)
7961 TREE_PUBLIC (v
[i
]) = TREE_PUBLIC (decl
);
7962 TREE_STATIC (v
[i
]) = TREE_STATIC (decl
);
7963 DECL_COMMON (v
[i
]) = DECL_COMMON (decl
);
7964 DECL_COMDAT (v
[i
]) = DECL_COMDAT (decl
);
7965 if (TREE_STATIC (v
[i
]))
7967 CP_DECL_THREAD_LOCAL_P (v
[i
])
7968 = CP_DECL_THREAD_LOCAL_P (decl
);
7969 set_decl_tls_model (v
[i
], DECL_TLS_MODEL (decl
));
7970 if (DECL_ONE_ONLY (decl
))
7971 make_decl_one_only (v
[i
], cxx_comdat_group (v
[i
]));
7972 if (TREE_PUBLIC (decl
))
7973 DECL_WEAK (v
[i
]) = DECL_WEAK (decl
);
7974 DECL_VISIBILITY (v
[i
]) = DECL_VISIBILITY (decl
);
7975 DECL_VISIBILITY_SPECIFIED (v
[i
])
7976 = DECL_VISIBILITY_SPECIFIED (decl
);
7978 cp_finish_decl (v
[i
], init
, /*constexpr*/false,
7979 /*asm*/NULL_TREE
, LOOKUP_NORMAL
);
7982 /* Ignore reads from the underlying decl performed during initialization
7983 of the individual variables. If those will be read, we'll mark
7984 the underlying decl as read at that point. */
7985 DECL_READ_P (decl
) = save_read
;
7987 else if (TREE_CODE (type
) == UNION_TYPE
)
7989 error_at (loc
, "cannot decompose union type %qT", type
);
7992 else if (!CLASS_TYPE_P (type
))
7994 error_at (loc
, "cannot decompose non-array non-class type %qT", type
);
7997 else if (LAMBDA_TYPE_P (type
))
7999 error_at (loc
, "cannot decompose lambda closure type %qT", type
);
8002 else if (processing_template_decl
&& !COMPLETE_TYPE_P (type
))
8003 pedwarn (loc
, 0, "structured binding refers to incomplete class type %qT",
8007 tree btype
= find_decomp_class_base (loc
, type
, NULL_TREE
);
8008 if (btype
== error_mark_node
)
8010 else if (btype
== NULL_TREE
)
8012 error_at (loc
, "cannot decompose class type %qT without non-static "
8013 "data members", type
);
8016 for (tree field
= TYPE_FIELDS (btype
); field
; field
= TREE_CHAIN (field
))
8017 if (TREE_CODE (field
) != FIELD_DECL
8018 || DECL_ARTIFICIAL (field
)
8019 || DECL_UNNAMED_BIT_FIELD (field
))
8023 if (count
!= eltscnt
)
8028 t
= convert_to_base (t
, btype
, /*check_access*/true,
8029 /*nonnull*/false, tf_warning_or_error
);
8033 for (tree field
= TYPE_FIELDS (btype
); field
; field
= TREE_CHAIN (field
))
8034 if (TREE_CODE (field
) != FIELD_DECL
8035 || DECL_ARTIFICIAL (field
)
8036 || DECL_UNNAMED_BIT_FIELD (field
))
8040 tree tt
= finish_non_static_data_member (field
, unshare_expr (t
),
8042 if (REFERENCE_REF_P (tt
))
8043 tt
= TREE_OPERAND (tt
, 0);
8044 TREE_TYPE (v
[i
]) = TREE_TYPE (tt
);
8045 layout_decl (v
[i
], 0);
8046 if (!processing_template_decl
)
8048 SET_DECL_VALUE_EXPR (v
[i
], tt
);
8049 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
8054 if (processing_template_decl
)
8056 for (unsigned int i
= 0; i
< count
; i
++)
8057 if (!DECL_HAS_VALUE_EXPR_P (v
[i
]))
8059 tree a
= build_nt (ARRAY_REF
, decl
, size_int (i
),
8060 NULL_TREE
, NULL_TREE
);
8061 SET_DECL_VALUE_EXPR (v
[i
], a
);
8062 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
8067 /* Returns a declaration for a VAR_DECL as if:
8069 extern "C" TYPE NAME;
8071 had been seen. Used to create compiler-generated global
8075 declare_global_var (tree name
, tree type
)
8079 push_to_top_level ();
8080 decl
= build_decl (input_location
, VAR_DECL
, name
, type
);
8081 TREE_PUBLIC (decl
) = 1;
8082 DECL_EXTERNAL (decl
) = 1;
8083 DECL_ARTIFICIAL (decl
) = 1;
8084 DECL_CONTEXT (decl
) = FROB_CONTEXT (global_namespace
);
8085 /* If the user has explicitly declared this variable (perhaps
8086 because the code we are compiling is part of a low-level runtime
8087 library), then it is possible that our declaration will be merged
8088 with theirs by pushdecl. */
8089 decl
= pushdecl (decl
);
8090 cp_finish_decl (decl
, NULL_TREE
, false, NULL_TREE
, 0);
8091 pop_from_top_level ();
8096 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
8097 if "__cxa_atexit" is not being used) corresponding to the function
8098 to be called when the program exits. */
8101 get_atexit_fn_ptr_type (void)
8105 if (!atexit_fn_ptr_type_node
)
8108 if (flag_use_cxa_atexit
8109 && !targetm
.cxx
.use_atexit_for_cxa_atexit ())
8110 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
8111 arg_type
= ptr_type_node
;
8113 /* The parameter to "atexit" is "void (*)(void)". */
8114 arg_type
= NULL_TREE
;
8116 fn_type
= build_function_type_list (void_type_node
,
8117 arg_type
, NULL_TREE
);
8118 atexit_fn_ptr_type_node
= build_pointer_type (fn_type
);
8121 return atexit_fn_ptr_type_node
;
8124 /* Returns a pointer to the `atexit' function. Note that if
8125 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
8126 `__cxa_atexit' function specified in the IA64 C++ ABI. */
8129 get_atexit_node (void)
8135 bool use_aeabi_atexit
;
8140 if (flag_use_cxa_atexit
&& !targetm
.cxx
.use_atexit_for_cxa_atexit ())
8142 /* The declaration for `__cxa_atexit' is:
8144 int __cxa_atexit (void (*)(void *), void *, void *)
8146 We build up the argument types and then the function type
8148 tree argtype0
, argtype1
, argtype2
;
8150 use_aeabi_atexit
= targetm
.cxx
.use_aeabi_atexit ();
8151 /* First, build the pointer-to-function type for the first
8153 fn_ptr_type
= get_atexit_fn_ptr_type ();
8154 /* Then, build the rest of the argument types. */
8155 argtype2
= ptr_type_node
;
8156 if (use_aeabi_atexit
)
8158 argtype1
= fn_ptr_type
;
8159 argtype0
= ptr_type_node
;
8163 argtype1
= ptr_type_node
;
8164 argtype0
= fn_ptr_type
;
8166 /* And the final __cxa_atexit type. */
8167 fn_type
= build_function_type_list (integer_type_node
,
8168 argtype0
, argtype1
, argtype2
,
8170 if (use_aeabi_atexit
)
8171 name
= "__aeabi_atexit";
8173 name
= "__cxa_atexit";
8177 /* The declaration for `atexit' is:
8179 int atexit (void (*)());
8181 We build up the argument types and then the function type
8183 fn_ptr_type
= get_atexit_fn_ptr_type ();
8184 /* Build the final atexit type. */
8185 fn_type
= build_function_type_list (integer_type_node
,
8186 fn_ptr_type
, NULL_TREE
);
8190 /* Now, build the function declaration. */
8191 push_lang_context (lang_name_c
);
8192 atexit_fndecl
= build_library_fn_ptr (name
, fn_type
, ECF_LEAF
| ECF_NOTHROW
);
8193 mark_used (atexit_fndecl
);
8194 pop_lang_context ();
8195 atexit_node
= decay_conversion (atexit_fndecl
, tf_warning_or_error
);
8200 /* Like get_atexit_node, but for thread-local cleanups. */
8203 get_thread_atexit_node (void)
8205 /* The declaration for `__cxa_thread_atexit' is:
8207 int __cxa_thread_atexit (void (*)(void *), void *, void *) */
8208 tree fn_type
= build_function_type_list (integer_type_node
,
8209 get_atexit_fn_ptr_type (),
8210 ptr_type_node
, ptr_type_node
,
8213 /* Now, build the function declaration. */
8214 tree atexit_fndecl
= build_library_fn_ptr ("__cxa_thread_atexit", fn_type
,
8215 ECF_LEAF
| ECF_NOTHROW
);
8216 return decay_conversion (atexit_fndecl
, tf_warning_or_error
);
8219 /* Returns the __dso_handle VAR_DECL. */
8222 get_dso_handle_node (void)
8224 if (dso_handle_node
)
8225 return dso_handle_node
;
8227 /* Declare the variable. */
8228 dso_handle_node
= declare_global_var (get_identifier ("__dso_handle"),
8231 #ifdef HAVE_GAS_HIDDEN
8232 if (dso_handle_node
!= error_mark_node
)
8234 DECL_VISIBILITY (dso_handle_node
) = VISIBILITY_HIDDEN
;
8235 DECL_VISIBILITY_SPECIFIED (dso_handle_node
) = 1;
8239 return dso_handle_node
;
8242 /* Begin a new function with internal linkage whose job will be simply
8243 to destroy some particular variable. */
8245 static GTY(()) int start_cleanup_cnt
;
8248 start_cleanup_fn (void)
8253 bool use_cxa_atexit
= flag_use_cxa_atexit
8254 && !targetm
.cxx
.use_atexit_for_cxa_atexit ();
8256 push_to_top_level ();
8258 /* No need to mangle this. */
8259 push_lang_context (lang_name_c
);
8261 /* Build the name of the function. */
8262 sprintf (name
, "__tcf_%d", start_cleanup_cnt
++);
8263 /* Build the function declaration. */
8264 fntype
= TREE_TYPE (get_atexit_fn_ptr_type ());
8265 fndecl
= build_lang_decl (FUNCTION_DECL
, get_identifier (name
), fntype
);
8266 /* It's a function with internal linkage, generated by the
8268 TREE_PUBLIC (fndecl
) = 0;
8269 DECL_ARTIFICIAL (fndecl
) = 1;
8270 /* Make the function `inline' so that it is only emitted if it is
8271 actually needed. It is unlikely that it will be inlined, since
8272 it is only called via a function pointer, but we avoid unnecessary
8273 emissions this way. */
8274 DECL_DECLARED_INLINE_P (fndecl
) = 1;
8275 DECL_INTERFACE_KNOWN (fndecl
) = 1;
8276 /* Build the parameter. */
8279 tree parmdecl
= cp_build_parm_decl (fndecl
, NULL_TREE
, ptr_type_node
);
8280 TREE_USED (parmdecl
) = 1;
8281 DECL_READ_P (parmdecl
) = 1;
8282 DECL_ARGUMENTS (fndecl
) = parmdecl
;
8286 start_preparsed_function (fndecl
, NULL_TREE
, SF_PRE_PARSED
);
8288 pop_lang_context ();
8290 return current_function_decl
;
8293 /* Finish the cleanup function begun by start_cleanup_fn. */
8296 end_cleanup_fn (void)
8298 expand_or_defer_fn (finish_function (/*inline_p=*/false));
8300 pop_from_top_level ();
8303 /* Generate code to handle the destruction of DECL, an object with
8304 static storage duration. */
8307 register_dtor_fn (tree decl
)
8314 bool ob_parm
, dso_parm
, use_dtor
;
8315 tree arg0
, arg1
, arg2
;
8318 type
= TREE_TYPE (decl
);
8319 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type
))
8322 /* If we're using "__cxa_atexit" (or "__cxa_thread_atexit" or
8323 "__aeabi_atexit"), and DECL is a class object, we can just pass the
8324 destructor to "__cxa_atexit"; we don't have to build a temporary
8325 function to do the cleanup. */
8326 dso_parm
= (flag_use_cxa_atexit
8327 && !targetm
.cxx
.use_atexit_for_cxa_atexit ());
8328 ob_parm
= (CP_DECL_THREAD_LOCAL_P (decl
) || dso_parm
);
8329 use_dtor
= ob_parm
&& CLASS_TYPE_P (type
);
8332 cleanup
= get_class_binding (type
, complete_dtor_identifier
);
8334 /* Make sure it is accessible. */
8335 perform_or_defer_access_check (TYPE_BINFO (type
), cleanup
, cleanup
,
8336 tf_warning_or_error
);
8340 /* Call build_cleanup before we enter the anonymous function so
8341 that any access checks will be done relative to the current
8342 scope, rather than the scope of the anonymous function. */
8343 build_cleanup (decl
);
8345 /* Now start the function. */
8346 cleanup
= start_cleanup_fn ();
8348 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
8349 to the original function, rather than the anonymous one. That
8350 will make the back end think that nested functions are in use,
8351 which causes confusion. */
8352 push_deferring_access_checks (dk_no_check
);
8353 fcall
= build_cleanup (decl
);
8354 pop_deferring_access_checks ();
8356 /* Create the body of the anonymous function. */
8357 compound_stmt
= begin_compound_stmt (BCS_FN_BODY
);
8358 finish_expr_stmt (fcall
);
8359 finish_compound_stmt (compound_stmt
);
8363 /* Call atexit with the cleanup function. */
8364 mark_used (cleanup
);
8365 cleanup
= build_address (cleanup
);
8367 if (CP_DECL_THREAD_LOCAL_P (decl
))
8368 atex_node
= get_thread_atexit_node ();
8370 atex_node
= get_atexit_node ();
8374 /* We must convert CLEANUP to the type that "__cxa_atexit"
8376 cleanup
= build_nop (get_atexit_fn_ptr_type (), cleanup
);
8377 /* "__cxa_atexit" will pass the address of DECL to the
8378 cleanup function. */
8380 addr
= build_address (decl
);
8381 /* The declared type of the parameter to "__cxa_atexit" is
8382 "void *". For plain "T*", we could just let the
8383 machinery in cp_build_function_call convert it -- but if the
8384 type is "cv-qualified T *", then we need to convert it
8385 before passing it in, to avoid spurious errors. */
8386 addr
= build_nop (ptr_type_node
, addr
);
8389 /* Since the cleanup functions we build ignore the address
8390 they're given, there's no reason to pass the actual address
8391 in, and, in general, it's cheaper to pass NULL than any
8393 addr
= null_pointer_node
;
8396 arg2
= cp_build_addr_expr (get_dso_handle_node (),
8397 tf_warning_or_error
);
8399 /* Just pass NULL to the dso handle parm if we don't actually
8400 have a DSO handle on this target. */
8401 arg2
= null_pointer_node
;
8407 if (!CP_DECL_THREAD_LOCAL_P (decl
)
8408 && targetm
.cxx
.use_aeabi_atexit ())
8424 return cp_build_function_call_nary (atex_node
, tf_warning_or_error
,
8425 arg0
, arg1
, arg2
, NULL_TREE
);
8428 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
8429 is its initializer. Generate code to handle the construction
8430 and destruction of DECL. */
8433 expand_static_init (tree decl
, tree init
)
8435 gcc_assert (VAR_P (decl
));
8436 gcc_assert (TREE_STATIC (decl
));
8438 /* Some variables require no dynamic initialization. */
8439 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl
)))
8441 /* Make sure the destructor is callable. */
8442 cxx_maybe_build_cleanup (decl
, tf_warning_or_error
);
8447 if (CP_DECL_THREAD_LOCAL_P (decl
) && DECL_GNU_TLS_P (decl
)
8448 && !DECL_FUNCTION_SCOPE_P (decl
))
8450 location_t dloc
= DECL_SOURCE_LOCATION (decl
);
8452 error_at (dloc
, "non-local variable %qD declared %<__thread%> "
8453 "needs dynamic initialization", decl
);
8455 error_at (dloc
, "non-local variable %qD declared %<__thread%> "
8456 "has a non-trivial destructor", decl
);
8457 static bool informed
;
8460 inform (dloc
, "C++11 %<thread_local%> allows dynamic "
8461 "initialization and destruction");
8467 if (DECL_FUNCTION_SCOPE_P (decl
))
8469 /* Emit code to perform this initialization but once. */
8470 tree if_stmt
= NULL_TREE
, inner_if_stmt
= NULL_TREE
;
8471 tree then_clause
= NULL_TREE
, inner_then_clause
= NULL_TREE
;
8472 tree guard
, guard_addr
;
8474 /* We don't need thread-safety code for thread-local vars. */
8475 bool thread_guard
= (flag_threadsafe_statics
8476 && !CP_DECL_THREAD_LOCAL_P (decl
));
8478 /* Emit code to perform this initialization but once. This code
8481 static <type> guard;
8482 if (!__atomic_load (guard.first_byte)) {
8483 if (__cxa_guard_acquire (&guard)) {
8486 // Do initialization.
8487 flag = true; __cxa_guard_release (&guard);
8488 // Register variable for destruction at end of program.
8490 if (!flag) __cxa_guard_abort (&guard);
8495 Note that the `flag' variable is only set to 1 *after* the
8496 initialization is complete. This ensures that an exception,
8497 thrown during the construction, will cause the variable to
8498 reinitialized when we pass through this code again, as per:
8502 If the initialization exits by throwing an exception, the
8503 initialization is not complete, so it will be tried again
8504 the next time control enters the declaration.
8506 This process should be thread-safe, too; multiple threads
8507 should not be able to initialize the variable more than
8510 /* Create the guard variable. */
8511 guard
= get_guard (decl
);
8513 /* Begin the conditional initialization. */
8514 if_stmt
= begin_if_stmt ();
8516 finish_if_stmt_cond (get_guard_cond (guard
, thread_guard
), if_stmt
);
8517 then_clause
= begin_compound_stmt (BCS_NO_SCOPE
);
8521 tree vfntype
= NULL_TREE
;
8522 tree acquire_name
, release_name
, abort_name
;
8523 tree acquire_fn
, release_fn
, abort_fn
;
8524 guard_addr
= build_address (guard
);
8526 acquire_name
= get_identifier ("__cxa_guard_acquire");
8527 release_name
= get_identifier ("__cxa_guard_release");
8528 abort_name
= get_identifier ("__cxa_guard_abort");
8529 acquire_fn
= get_global_binding (acquire_name
);
8530 release_fn
= get_global_binding (release_name
);
8531 abort_fn
= get_global_binding (abort_name
);
8533 acquire_fn
= push_library_fn
8534 (acquire_name
, build_function_type_list (integer_type_node
,
8535 TREE_TYPE (guard_addr
),
8537 NULL_TREE
, ECF_NOTHROW
| ECF_LEAF
);
8538 if (!release_fn
|| !abort_fn
)
8539 vfntype
= build_function_type_list (void_type_node
,
8540 TREE_TYPE (guard_addr
),
8543 release_fn
= push_library_fn (release_name
, vfntype
, NULL_TREE
,
8544 ECF_NOTHROW
| ECF_LEAF
);
8546 abort_fn
= push_library_fn (abort_name
, vfntype
, NULL_TREE
,
8547 ECF_NOTHROW
| ECF_LEAF
);
8549 inner_if_stmt
= begin_if_stmt ();
8550 finish_if_stmt_cond (build_call_n (acquire_fn
, 1, guard_addr
),
8553 inner_then_clause
= begin_compound_stmt (BCS_NO_SCOPE
);
8554 begin
= get_target_expr (boolean_false_node
);
8555 flag
= TARGET_EXPR_SLOT (begin
);
8557 TARGET_EXPR_CLEANUP (begin
)
8558 = build3 (COND_EXPR
, void_type_node
, flag
,
8560 build_call_n (abort_fn
, 1, guard_addr
));
8561 CLEANUP_EH_ONLY (begin
) = 1;
8563 /* Do the initialization itself. */
8564 init
= add_stmt_to_compound (begin
, init
);
8565 init
= add_stmt_to_compound
8566 (init
, build2 (MODIFY_EXPR
, void_type_node
, flag
, boolean_true_node
));
8567 init
= add_stmt_to_compound
8568 (init
, build_call_n (release_fn
, 1, guard_addr
));
8571 init
= add_stmt_to_compound (init
, set_guard (guard
));
8573 /* Use atexit to register a function for destroying this static
8575 init
= add_stmt_to_compound (init
, register_dtor_fn (decl
));
8577 finish_expr_stmt (init
);
8581 finish_compound_stmt (inner_then_clause
);
8582 finish_then_clause (inner_if_stmt
);
8583 finish_if_stmt (inner_if_stmt
);
8586 finish_compound_stmt (then_clause
);
8587 finish_then_clause (if_stmt
);
8588 finish_if_stmt (if_stmt
);
8590 else if (CP_DECL_THREAD_LOCAL_P (decl
))
8591 tls_aggregates
= tree_cons (init
, decl
, tls_aggregates
);
8593 static_aggregates
= tree_cons (init
, decl
, static_aggregates
);
8597 /* Make TYPE a complete type based on INITIAL_VALUE.
8598 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
8599 2 if there was no information (in which case assume 0 if DO_DEFAULT),
8600 3 if the initializer list is empty (in pedantic mode). */
8603 cp_complete_array_type (tree
*ptype
, tree initial_value
, bool do_default
)
8606 tree type
, elt_type
;
8608 /* Don't get confused by a CONSTRUCTOR for some other type. */
8609 if (initial_value
&& TREE_CODE (initial_value
) == CONSTRUCTOR
8610 && !BRACE_ENCLOSED_INITIALIZER_P (initial_value
)
8611 && TREE_CODE (TREE_TYPE (initial_value
)) != ARRAY_TYPE
)
8616 unsigned HOST_WIDE_INT i
;
8619 /* An array of character type can be initialized from a
8620 brace-enclosed string constant.
8622 FIXME: this code is duplicated from reshape_init. Probably
8623 we should just call reshape_init here? */
8624 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype
)))
8625 && TREE_CODE (initial_value
) == CONSTRUCTOR
8626 && !vec_safe_is_empty (CONSTRUCTOR_ELTS (initial_value
)))
8628 vec
<constructor_elt
, va_gc
> *v
= CONSTRUCTOR_ELTS (initial_value
);
8629 tree value
= (*v
)[0].value
;
8630 STRIP_ANY_LOCATION_WRAPPER (value
);
8632 if (TREE_CODE (value
) == STRING_CST
8633 && v
->length () == 1)
8634 initial_value
= value
;
8637 /* If any of the elements are parameter packs, we can't actually
8638 complete this type now because the array size is dependent. */
8639 if (TREE_CODE (initial_value
) == CONSTRUCTOR
)
8641 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value
),
8644 if (PACK_EXPANSION_P (value
))
8650 failure
= complete_array_type (ptype
, initial_value
, do_default
);
8652 /* We can create the array before the element type is complete, which
8653 means that we didn't have these two bits set in the original type
8654 either. In completing the type, we are expected to propagate these
8655 bits. See also complete_type which does the same thing for arrays
8658 if (type
!= error_mark_node
&& TYPE_DOMAIN (type
))
8660 elt_type
= TREE_TYPE (type
);
8661 TYPE_NEEDS_CONSTRUCTING (type
) = TYPE_NEEDS_CONSTRUCTING (elt_type
);
8662 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
)
8663 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type
);
8669 /* As above, but either give an error or reject zero-size arrays, depending
8673 cp_complete_array_type_or_error (tree
*ptype
, tree initial_value
,
8674 bool do_default
, tsubst_flags_t complain
)
8677 bool sfinae
= !(complain
& tf_error
);
8678 /* In SFINAE context we can't be lenient about zero-size arrays. */
8681 failure
= cp_complete_array_type (ptype
, initial_value
, do_default
);
8687 /* Not an error. */;
8688 else if (failure
== 1)
8689 error ("initializer fails to determine size of %qT", *ptype
);
8690 else if (failure
== 2)
8693 error ("array size missing in %qT", *ptype
);
8695 else if (failure
== 3)
8696 error ("zero-size array %qT", *ptype
);
8697 *ptype
= error_mark_node
;
8702 /* Return zero if something is declared to be a member of type
8703 CTYPE when in the context of CUR_TYPE. STRING is the error
8704 message to print in that case. Otherwise, quietly return 1. */
8707 member_function_or_else (tree ctype
, tree cur_type
, enum overload_flags flags
)
8709 if (ctype
&& ctype
!= cur_type
)
8711 if (flags
== DTOR_FLAG
)
8712 error ("destructor for alien class %qT cannot be a member", ctype
);
8714 error ("constructor for alien class %qT cannot be a member", ctype
);
8720 /* Subroutine of `grokdeclarator'. */
8722 /* Generate errors possibly applicable for a given set of specifiers.
8723 This is for ARM $7.1.2. */
8726 bad_specifiers (tree object
,
8727 enum bad_spec_place type
,
8733 const location_t
* locations
)
8739 error_at (locations
[ds_virtual
],
8740 "%qD declared as a %<virtual%> variable", object
);
8742 error ("%<const%> and %<volatile%> function specifiers on "
8743 "%qD invalid in variable declaration", object
);
8747 error_at (locations
[ds_virtual
],
8748 "%qD declared as a %<virtual%> parameter", object
);
8750 error_at (locations
[ds_inline
],
8751 "%qD declared as an %<inline%> parameter", object
);
8753 error ("%<const%> and %<volatile%> function specifiers on "
8754 "%qD invalid in parameter declaration", object
);
8758 error_at (locations
[ds_virtual
],
8759 "%qD declared as a %<virtual%> type", object
);
8761 error_at (locations
[ds_inline
],
8762 "%qD declared as an %<inline%> type", object
);
8764 error ("%<const%> and %<volatile%> function specifiers on "
8765 "%qD invalid in type declaration", object
);
8769 error_at (locations
[ds_virtual
],
8770 "%qD declared as a %<virtual%> field", object
);
8772 error_at (locations
[ds_inline
],
8773 "%qD declared as an %<inline%> field", object
);
8775 error ("%<const%> and %<volatile%> function specifiers on "
8776 "%qD invalid in field declaration", object
);
8782 error ("%q+D declared as a friend", object
);
8784 && !flag_noexcept_type
8785 && (TREE_CODE (object
) == TYPE_DECL
8786 || (!TYPE_PTRFN_P (TREE_TYPE (object
))
8787 && !TYPE_REFFN_P (TREE_TYPE (object
))
8788 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object
)))))
8789 error ("%q+D declared with an exception specification", object
);
8792 /* DECL is a member function or static data member and is presently
8793 being defined. Check that the definition is taking place in a
8797 check_class_member_definition_namespace (tree decl
)
8799 /* These checks only apply to member functions and static data
8801 gcc_assert (VAR_OR_FUNCTION_DECL_P (decl
));
8802 /* We check for problems with specializations in pt.c in
8803 check_specialization_namespace, where we can issue better
8805 if (processing_specialization
)
8807 /* We check this in check_explicit_instantiation_namespace. */
8808 if (processing_explicit_instantiation
)
8812 A member function definition that appears outside of the
8813 class definition shall appear in a namespace scope enclosing
8814 the class definition.
8818 The definition for a static data member shall appear in a
8819 namespace scope enclosing the member's class definition. */
8820 if (!is_ancestor (current_namespace
, DECL_CONTEXT (decl
)))
8821 permerror (input_location
, "definition of %qD is not in namespace enclosing %qT",
8822 decl
, DECL_CONTEXT (decl
));
8825 /* Build a PARM_DECL for the "this" parameter of FN. TYPE is the
8826 METHOD_TYPE for a non-static member function; QUALS are the
8827 cv-qualifiers that apply to the function. */
8830 build_this_parm (tree fn
, tree type
, cp_cv_quals quals
)
8835 cp_cv_quals this_quals
;
8837 if (CLASS_TYPE_P (type
))
8840 = cp_build_qualified_type (type
, quals
& ~TYPE_QUAL_RESTRICT
);
8841 this_type
= build_pointer_type (this_type
);
8844 this_type
= type_of_this_parm (type
);
8845 /* The `this' parameter is implicitly `const'; it cannot be
8847 this_quals
= (quals
& TYPE_QUAL_RESTRICT
) | TYPE_QUAL_CONST
;
8848 qual_type
= cp_build_qualified_type (this_type
, this_quals
);
8849 parm
= build_artificial_parm (fn
, this_identifier
, qual_type
);
8850 cp_apply_type_quals_to_decl (this_quals
, parm
);
8854 /* DECL is a static member function. Complain if it was declared
8855 with function-cv-quals. */
8858 check_static_quals (tree decl
, cp_cv_quals quals
)
8860 if (quals
!= TYPE_UNQUALIFIED
)
8861 error ("static member function %q#D declared with type qualifiers",
8865 // Check that FN takes no arguments and returns bool.
8867 check_concept_fn (tree fn
)
8869 // A constraint is nullary.
8870 if (DECL_ARGUMENTS (fn
))
8871 error_at (DECL_SOURCE_LOCATION (fn
),
8872 "concept %q#D declared with function parameters", fn
);
8874 // The declared return type of the concept shall be bool, and
8875 // it shall not be deduced from it definition.
8876 tree type
= TREE_TYPE (TREE_TYPE (fn
));
8878 error_at (DECL_SOURCE_LOCATION (fn
),
8879 "concept %q#D declared with a deduced return type", fn
);
8880 else if (type
!= boolean_type_node
)
8881 error_at (DECL_SOURCE_LOCATION (fn
),
8882 "concept %q#D with non-%<bool%> return type %qT", fn
, type
);
8885 /* Helper function. Replace the temporary this parameter injected
8886 during cp_finish_omp_declare_simd with the real this parameter. */
8889 declare_simd_adjust_this (tree
*tp
, int *walk_subtrees
, void *data
)
8891 tree this_parm
= (tree
) data
;
8892 if (TREE_CODE (*tp
) == PARM_DECL
8893 && DECL_NAME (*tp
) == this_identifier
8894 && *tp
!= this_parm
)
8896 else if (TYPE_P (*tp
))
8901 /* CTYPE is class type, or null if non-class.
8902 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
8904 DECLARATOR is the function's name.
8905 PARMS is a chain of PARM_DECLs for the function.
8906 VIRTUALP is truthvalue of whether the function is virtual or not.
8907 FLAGS are to be passed through to `grokclassfn'.
8908 QUALS are qualifiers indicating whether the function is `const'
8910 RAISES is a list of exceptions that this function can raise.
8911 CHECK is 1 if we must find this method in CTYPE, 0 if we should
8912 not look, and -1 if we should not call `grokclassfn' at all.
8914 SFK is the kind of special function (if any) for the new function.
8916 Returns `NULL_TREE' if something goes wrong, after issuing
8917 applicable error messages. */
8920 grokfndecl (tree ctype
,
8924 tree orig_declarator
,
8925 const cp_decl_specifier_seq
*declspecs
,
8928 enum overload_flags flags
,
8930 cp_ref_qualifier rqual
,
8937 special_function_kind sfk
,
8939 bool late_return_type_p
,
8943 location_t location
)
8946 int staticp
= ctype
&& TREE_CODE (type
) == FUNCTION_TYPE
;
8949 if (location
== UNKNOWN_LOCATION
)
8950 location
= input_location
;
8952 /* Was the concept specifier present? */
8953 bool concept_p
= inlinep
& 4;
8955 /* Concept declarations must have a corresponding definition. */
8956 if (concept_p
&& !funcdef_flag
)
8958 error_at (location
, "concept %qD has no definition", declarator
);
8962 type
= build_cp_fntype_variant (type
, rqual
, raises
, late_return_type_p
);
8964 decl
= build_lang_decl_loc (location
, FUNCTION_DECL
, declarator
, type
);
8966 /* Set the constraints on the declaration. */
8969 tree tmpl_reqs
= NULL_TREE
;
8970 if (processing_template_decl
> template_class_depth (ctype
))
8971 tmpl_reqs
= TEMPLATE_PARMS_CONSTRAINTS (current_template_parms
);
8973 /* Adjust the required expression into a constraint. */
8975 decl_reqs
= normalize_expression (decl_reqs
);
8977 tree ci
= build_constraints (tmpl_reqs
, decl_reqs
);
8978 set_constraints (decl
, ci
);
8981 if (TREE_CODE (type
) == METHOD_TYPE
)
8983 tree parm
= build_this_parm (decl
, type
, quals
);
8984 DECL_CHAIN (parm
) = parms
;
8987 /* Allocate space to hold the vptr bit if needed. */
8988 SET_DECL_ALIGN (decl
, MINIMUM_METHOD_BOUNDARY
);
8991 DECL_ARGUMENTS (decl
) = parms
;
8992 for (t
= parms
; t
; t
= DECL_CHAIN (t
))
8993 DECL_CONTEXT (t
) = decl
;
8995 /* Propagate volatile out from type to decl. */
8996 if (TYPE_VOLATILE (type
))
8997 TREE_THIS_VOLATILE (decl
) = 1;
8999 /* Setup decl according to sfk. */
9002 case sfk_constructor
:
9003 case sfk_copy_constructor
:
9004 case sfk_move_constructor
:
9005 DECL_CXX_CONSTRUCTOR_P (decl
) = 1;
9006 DECL_NAME (decl
) = ctor_identifier
;
9008 case sfk_destructor
:
9009 DECL_CXX_DESTRUCTOR_P (decl
) = 1;
9010 DECL_NAME (decl
) = dtor_identifier
;
9016 if (friendp
&& TREE_CODE (orig_declarator
) == TEMPLATE_ID_EXPR
)
9020 "defining explicit specialization %qD in friend declaration",
9024 tree fns
= TREE_OPERAND (orig_declarator
, 0);
9025 tree args
= TREE_OPERAND (orig_declarator
, 1);
9027 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
9029 /* Something like `template <class T> friend void f<T>()'. */
9031 "invalid use of template-id %qD in declaration "
9032 "of primary template",
9038 /* A friend declaration of the form friend void f<>(). Record
9039 the information in the TEMPLATE_ID_EXPR. */
9040 SET_DECL_IMPLICIT_INSTANTIATION (decl
);
9042 gcc_assert (identifier_p (fns
) || OVL_P (fns
));
9043 DECL_TEMPLATE_INFO (decl
) = build_template_info (fns
, args
);
9045 for (t
= TYPE_ARG_TYPES (TREE_TYPE (decl
)); t
; t
= TREE_CHAIN (t
))
9046 if (TREE_PURPOSE (t
)
9047 && TREE_CODE (TREE_PURPOSE (t
)) == DEFERRED_PARSE
)
9049 error_at (defparse_location (TREE_PURPOSE (t
)),
9050 "default arguments are not allowed in declaration "
9051 "of friend template specialization %qD",
9058 error_at (declspecs
->locations
[ds_inline
],
9059 "%<inline%> is not allowed in declaration of friend "
9060 "template specialization %qD",
9067 /* C++17 11.3.6/4: "If a friend declaration specifies a default argument
9068 expression, that declaration shall be a definition..." */
9069 if (friendp
&& !funcdef_flag
)
9071 for (tree t
= FUNCTION_FIRST_USER_PARMTYPE (decl
);
9072 t
&& t
!= void_list_node
; t
= TREE_CHAIN (t
))
9073 if (TREE_PURPOSE (t
))
9075 permerror (DECL_SOURCE_LOCATION (decl
),
9076 "friend declaration of %qD specifies default "
9077 "arguments and isn%'t a definition", decl
);
9082 /* If this decl has namespace scope, set that up. */
9084 set_decl_namespace (decl
, in_namespace
, friendp
);
9086 DECL_CONTEXT (decl
) = FROB_CONTEXT (current_decl_namespace ());
9088 /* `main' and builtins have implicit 'C' linkage. */
9089 if (ctype
== NULL_TREE
9090 && DECL_FILE_SCOPE_P (decl
)
9091 && current_lang_name
== lang_name_cplusplus
9092 && (MAIN_NAME_P (declarator
)
9093 || (IDENTIFIER_LENGTH (declarator
) > 10
9094 && IDENTIFIER_POINTER (declarator
)[0] == '_'
9095 && IDENTIFIER_POINTER (declarator
)[1] == '_'
9096 && strncmp (IDENTIFIER_POINTER (declarator
)+2,
9097 "builtin_", 8) == 0)
9098 || (targetcm
.cxx_implicit_extern_c
9099 && (targetcm
.cxx_implicit_extern_c
9100 (IDENTIFIER_POINTER (declarator
))))))
9101 SET_DECL_LANGUAGE (decl
, lang_c
);
9103 /* Should probably propagate const out from type to decl I bet (mrs). */
9106 DECL_STATIC_FUNCTION_P (decl
) = 1;
9107 DECL_CONTEXT (decl
) = ctype
;
9111 DECL_DELETED_FN (decl
) = 1;
9115 DECL_CONTEXT (decl
) = ctype
;
9117 check_class_member_definition_namespace (decl
);
9120 if (ctype
== NULL_TREE
&& DECL_MAIN_P (decl
))
9122 if (PROCESSING_REAL_TEMPLATE_DECL_P())
9123 error_at (location
, "cannot declare %<::main%> to be a template");
9125 error_at (declspecs
->locations
[ds_inline
],
9126 "cannot declare %<::main%> to be inline");
9128 error_at (declspecs
->locations
[ds_constexpr
],
9129 "cannot declare %<::main%> to be %<constexpr%>");
9131 error_at (location
, "cannot declare %<::main%> to be static");
9136 /* Members of anonymous types and local classes have no linkage; make
9137 them internal. If a typedef is made later, this will be changed. */
9138 if (ctype
&& (!TREE_PUBLIC (TYPE_MAIN_DECL (ctype
))
9139 || decl_function_context (TYPE_MAIN_DECL (ctype
))))
9142 if (publicp
&& cxx_dialect
== cxx98
)
9144 /* [basic.link]: A name with no linkage (notably, the name of a class
9145 or enumeration declared in a local scope) shall not be used to
9146 declare an entity with linkage.
9148 DR 757 relaxes this restriction for C++0x. */
9149 no_linkage_error (decl
);
9152 TREE_PUBLIC (decl
) = publicp
;
9155 DECL_INTERFACE_KNOWN (decl
) = 1;
9156 DECL_NOT_REALLY_EXTERN (decl
) = 1;
9159 /* If the declaration was declared inline, mark it as such. */
9162 DECL_DECLARED_INLINE_P (decl
) = 1;
9164 DECL_COMDAT (decl
) = 1;
9167 DECL_DECLARED_CONSTEXPR_P (decl
) = true;
9169 // If the concept declaration specifier was found, check
9170 // that the declaration satisfies the necessary requirements.
9173 DECL_DECLARED_CONCEPT_P (decl
) = true;
9174 check_concept_fn (decl
);
9177 DECL_EXTERNAL (decl
) = 1;
9178 if (TREE_CODE (type
) == FUNCTION_TYPE
)
9181 TREE_TYPE (decl
) = apply_memfn_quals (TREE_TYPE (decl
),
9188 ? G_("static member function %qD cannot have cv-qualifier")
9189 : G_("non-member function %qD cannot have cv-qualifier"),
9191 quals
= TYPE_UNQUALIFIED
;
9197 ? G_("static member function %qD cannot have ref-qualifier")
9198 : G_("non-member function %qD cannot have ref-qualifier"),
9200 rqual
= REF_QUAL_NONE
;
9204 if (deduction_guide_p (decl
))
9206 if (!DECL_NAMESPACE_SCOPE_P (decl
))
9208 error_at (location
, "deduction guide %qD must be declared at "
9209 "namespace scope", decl
);
9214 "deduction guide %qD must not have a function body", decl
);
9216 else if (IDENTIFIER_ANY_OP_P (DECL_NAME (decl
))
9217 && !grok_op_properties (decl
, /*complain=*/true))
9219 else if (UDLIT_OPER_P (DECL_NAME (decl
)))
9221 bool long_long_unsigned_p
;
9223 const char *suffix
= NULL
;
9224 /* [over.literal]/6: Literal operators shall not have C linkage. */
9225 if (DECL_LANGUAGE (decl
) == lang_c
)
9227 error_at (location
, "literal operator with C linkage");
9228 maybe_show_extern_c_location ();
9232 if (DECL_NAMESPACE_SCOPE_P (decl
))
9234 if (!check_literal_operator_args (decl
, &long_long_unsigned_p
,
9237 error_at (location
, "%qD has invalid argument list", decl
);
9241 suffix
= UDLIT_OP_SUFFIX (DECL_NAME (decl
));
9242 if (long_long_unsigned_p
)
9244 if (cpp_interpret_int_suffix (parse_in
, suffix
, strlen (suffix
)))
9245 warning_at (location
, 0, "integer suffix %qs"
9246 " shadowed by implementation", suffix
);
9248 else if (long_double_p
)
9250 if (cpp_interpret_float_suffix (parse_in
, suffix
, strlen (suffix
)))
9251 warning_at (location
, 0, "floating-point suffix %qs"
9252 " shadowed by implementation", suffix
);
9255 if (suffix
[0] != '_'
9256 && !in_system_header_at (location
)
9257 && !current_function_decl
&& !(friendp
&& !funcdef_flag
))
9258 warning_at (location
, OPT_Wliteral_suffix
,
9259 "literal operator suffixes not preceded by %<_%>"
9260 " are reserved for future standardization");
9264 error_at (location
, "%qD must be a non-member function", decl
);
9270 /* Make the init_value nonzero so pushdecl knows this is not
9271 tentative. error_mark_node is replaced later with the BLOCK. */
9272 DECL_INITIAL (decl
) = error_mark_node
;
9274 if (TYPE_NOTHROW_P (type
) || nothrow_libfn_p (decl
))
9275 TREE_NOTHROW (decl
) = 1;
9277 if (flag_openmp
|| flag_openmp_simd
)
9279 /* Adjust "omp declare simd" attributes. */
9280 tree ods
= lookup_attribute ("omp declare simd", *attrlist
);
9284 for (attr
= ods
; attr
;
9285 attr
= lookup_attribute ("omp declare simd", TREE_CHAIN (attr
)))
9287 if (TREE_CODE (type
) == METHOD_TYPE
)
9288 walk_tree (&TREE_VALUE (attr
), declare_simd_adjust_this
,
9289 DECL_ARGUMENTS (decl
), NULL
);
9290 if (TREE_VALUE (attr
) != NULL_TREE
)
9292 tree cl
= TREE_VALUE (TREE_VALUE (attr
));
9293 cl
= c_omp_declare_simd_clauses_to_numbers
9294 (DECL_ARGUMENTS (decl
), cl
);
9296 TREE_VALUE (TREE_VALUE (attr
)) = cl
;
9298 TREE_VALUE (attr
) = NULL_TREE
;
9304 /* Caller will do the rest of this. */
9308 if (ctype
!= NULL_TREE
)
9309 grokclassfn (ctype
, decl
, flags
);
9312 if (cxx_dialect
>= cxx11
9313 && DECL_DESTRUCTOR_P (decl
)
9314 && !TYPE_BEING_DEFINED (DECL_CONTEXT (decl
))
9315 && !processing_template_decl
)
9316 deduce_noexcept_on_destructor (decl
);
9318 decl
= check_explicit_specialization (orig_declarator
, decl
,
9321 4 * (friendp
!= 0) +
9324 if (decl
== error_mark_node
)
9327 if (DECL_STATIC_FUNCTION_P (decl
))
9328 check_static_quals (decl
, quals
);
9332 cplus_decl_attributes (&decl
, *attrlist
, 0);
9333 *attrlist
= NULL_TREE
;
9336 /* Check main's type after attributes have been applied. */
9337 if (ctype
== NULL_TREE
&& DECL_MAIN_P (decl
))
9339 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl
)),
9342 tree oldtypeargs
= TYPE_ARG_TYPES (TREE_TYPE (decl
));
9344 error_at (declspecs
->locations
[ds_type_spec
],
9345 "%<::main%> must return %<int%>");
9346 newtype
= build_function_type (integer_type_node
, oldtypeargs
);
9347 TREE_TYPE (decl
) = newtype
;
9350 check_main_parameter_types (decl
);
9353 if (ctype
!= NULL_TREE
&& check
)
9355 tree old_decl
= check_classfn (ctype
, decl
,
9356 (processing_template_decl
9357 > template_class_depth (ctype
))
9358 ? current_template_parms
9361 if (old_decl
== error_mark_node
)
9369 if (TREE_CODE (old_decl
) == TEMPLATE_DECL
)
9370 /* Because grokfndecl is always supposed to return a
9371 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
9372 here. We depend on our callers to figure out that its
9373 really a template that's being returned. */
9374 old_decl
= DECL_TEMPLATE_RESULT (old_decl
);
9376 if (DECL_STATIC_FUNCTION_P (old_decl
)
9377 && TREE_CODE (TREE_TYPE (decl
)) == METHOD_TYPE
)
9379 /* Remove the `this' parm added by grokclassfn. */
9380 revert_static_member_fn (decl
);
9381 check_static_quals (decl
, quals
);
9383 if (DECL_ARTIFICIAL (old_decl
))
9385 error ("definition of implicitly-declared %qD", old_decl
);
9388 else if (DECL_DEFAULTED_FN (old_decl
))
9390 error ("definition of explicitly-defaulted %q+D", decl
);
9391 inform (DECL_SOURCE_LOCATION (old_decl
),
9392 "%q#D explicitly defaulted here", old_decl
);
9396 /* Since we've smashed OLD_DECL to its
9397 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
9398 if (TREE_CODE (decl
) == TEMPLATE_DECL
)
9399 decl
= DECL_TEMPLATE_RESULT (decl
);
9401 /* Attempt to merge the declarations. This can fail, in
9402 the case of some invalid specialization declarations. */
9403 pushed_scope
= push_scope (ctype
);
9404 ok
= duplicate_decls (decl
, old_decl
, friendp
);
9406 pop_scope (pushed_scope
);
9409 error ("no %q#D member function declared in class %qT",
9413 if (ok
== error_mark_node
)
9419 if (DECL_CONSTRUCTOR_P (decl
) && !grok_ctor_properties (ctype
, decl
))
9422 if (ctype
== NULL_TREE
|| check
)
9426 DECL_VIRTUAL_P (decl
) = 1;
9431 /* decl is a FUNCTION_DECL.
9432 specifiers are the parsed virt-specifiers.
9434 Set flags to reflect the virt-specifiers.
9439 set_virt_specifiers (tree decl
, cp_virt_specifiers specifiers
)
9441 if (decl
== NULL_TREE
)
9443 if (specifiers
& VIRT_SPEC_OVERRIDE
)
9444 DECL_OVERRIDE_P (decl
) = 1;
9445 if (specifiers
& VIRT_SPEC_FINAL
)
9446 DECL_FINAL_P (decl
) = 1;
9450 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
9451 the linkage that DECL will receive in the object file. */
9454 set_linkage_for_static_data_member (tree decl
)
9456 /* A static data member always has static storage duration and
9457 external linkage. Note that static data members are forbidden in
9458 local classes -- the only situation in which a class has
9459 non-external linkage. */
9460 TREE_PUBLIC (decl
) = 1;
9461 TREE_STATIC (decl
) = 1;
9462 /* For non-template classes, static data members are always put
9463 out in exactly those files where they are defined, just as
9464 with ordinary namespace-scope variables. */
9465 if (!processing_template_decl
)
9466 DECL_INTERFACE_KNOWN (decl
) = 1;
9469 /* Create a VAR_DECL named NAME with the indicated TYPE.
9471 If SCOPE is non-NULL, it is the class type or namespace containing
9472 the variable. If SCOPE is NULL, the variable should is created in
9473 the innermost enclosing scope. */
9476 grokvardecl (tree type
,
9478 tree orig_declarator
,
9479 const cp_decl_specifier_seq
*declspecs
,
9486 location_t location
)
9489 tree explicit_scope
;
9491 gcc_assert (!name
|| identifier_p (name
));
9493 bool constp
= (type_quals
& TYPE_QUAL_CONST
) != 0;
9494 bool volatilep
= (type_quals
& TYPE_QUAL_VOLATILE
) != 0;
9496 /* Compute the scope in which to place the variable, but remember
9497 whether or not that scope was explicitly specified by the user. */
9498 explicit_scope
= scope
;
9501 /* An explicit "extern" specifier indicates a namespace-scope
9503 if (declspecs
->storage_class
== sc_extern
)
9504 scope
= current_decl_namespace ();
9505 else if (!at_function_scope_p ())
9506 scope
= current_scope ();
9510 && (/* If the variable is a namespace-scope variable declared in a
9511 template, we need DECL_LANG_SPECIFIC. */
9512 (TREE_CODE (scope
) == NAMESPACE_DECL
&& processing_template_decl
)
9513 /* Similarly for namespace-scope variables with language linkage
9515 || (TREE_CODE (scope
) == NAMESPACE_DECL
9516 && current_lang_name
!= lang_name_cplusplus
)
9517 /* Similarly for static data members. */
9519 /* Similarly for explicit specializations. */
9521 && TREE_CODE (orig_declarator
) == TEMPLATE_ID_EXPR
)))
9522 decl
= build_lang_decl_loc (location
, VAR_DECL
, name
, type
);
9524 decl
= build_decl (location
, VAR_DECL
, name
, type
);
9526 if (explicit_scope
&& TREE_CODE (explicit_scope
) == NAMESPACE_DECL
)
9527 set_decl_namespace (decl
, explicit_scope
, 0);
9529 DECL_CONTEXT (decl
) = FROB_CONTEXT (scope
);
9531 if (declspecs
->storage_class
== sc_extern
)
9533 DECL_THIS_EXTERN (decl
) = 1;
9534 DECL_EXTERNAL (decl
) = !initialized
;
9537 if (DECL_CLASS_SCOPE_P (decl
))
9539 set_linkage_for_static_data_member (decl
);
9540 /* This function is only called with out-of-class definitions. */
9541 DECL_EXTERNAL (decl
) = 0;
9542 check_class_member_definition_namespace (decl
);
9544 /* At top level, either `static' or no s.c. makes a definition
9545 (perhaps tentative), and absence of `static' makes it public. */
9546 else if (toplevel_bindings_p ())
9548 TREE_PUBLIC (decl
) = (declspecs
->storage_class
!= sc_static
9549 && (DECL_THIS_EXTERN (decl
)
9553 TREE_STATIC (decl
) = ! DECL_EXTERNAL (decl
);
9555 /* Not at top level, only `static' makes a static definition. */
9558 TREE_STATIC (decl
) = declspecs
->storage_class
== sc_static
;
9559 TREE_PUBLIC (decl
) = DECL_EXTERNAL (decl
);
9562 if (decl_spec_seq_has_spec_p (declspecs
, ds_thread
))
9564 if (DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
9566 CP_DECL_THREAD_LOCAL_P (decl
) = true;
9567 if (!processing_template_decl
)
9568 set_decl_tls_model (decl
, decl_default_tls_model (decl
));
9570 if (declspecs
->gnu_thread_keyword_p
)
9571 SET_DECL_GNU_TLS_P (decl
);
9574 /* If the type of the decl has no linkage, make sure that we'll
9575 notice that in mark_used. */
9576 if (cxx_dialect
> cxx98
9577 && decl_linkage (decl
) != lk_none
9578 && DECL_LANG_SPECIFIC (decl
) == NULL
9579 && !DECL_EXTERN_C_P (decl
)
9580 && no_linkage_check (TREE_TYPE (decl
), /*relaxed_p=*/false))
9581 retrofit_lang_decl (decl
);
9583 if (TREE_PUBLIC (decl
))
9585 /* [basic.link]: A name with no linkage (notably, the name of a class
9586 or enumeration declared in a local scope) shall not be used to
9587 declare an entity with linkage.
9589 DR 757 relaxes this restriction for C++0x. */
9590 if (cxx_dialect
< cxx11
)
9591 no_linkage_error (decl
);
9594 DECL_INTERFACE_KNOWN (decl
) = 1;
9596 if (DECL_NAME (decl
)
9597 && MAIN_NAME_P (DECL_NAME (decl
))
9598 && scope
== global_namespace
)
9599 error_at (DECL_SOURCE_LOCATION (decl
),
9600 "cannot declare %<::main%> to be a global variable");
9602 /* Check that the variable can be safely declared as a concept.
9603 Note that this also forbids explicit specializations. */
9606 if (!processing_template_decl
)
9608 error_at (declspecs
->locations
[ds_concept
],
9609 "a non-template variable cannot be %<concept%>");
9613 DECL_DECLARED_CONCEPT_P (decl
) = true;
9614 if (!same_type_ignoring_top_level_qualifiers_p (type
, boolean_type_node
))
9615 error_at (declspecs
->locations
[ds_type_spec
],
9616 "concept must have type %<bool%>");
9618 else if (flag_concepts
9619 && processing_template_decl
> template_class_depth (scope
))
9621 tree reqs
= TEMPLATE_PARMS_CONSTRAINTS (current_template_parms
);
9622 tree ci
= build_constraints (reqs
, NULL_TREE
);
9623 set_constraints (decl
, ci
);
9626 // Handle explicit specializations and instantiations of variable templates.
9627 if (orig_declarator
)
9628 decl
= check_explicit_specialization (orig_declarator
, decl
,
9629 template_count
, conceptp
* 8);
9631 return decl
!= error_mark_node
? decl
: NULL_TREE
;
9634 /* Create and return a canonical pointer to member function type, for
9635 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
9638 build_ptrmemfunc_type (tree type
)
9643 if (type
== error_mark_node
)
9646 /* Make sure that we always have the unqualified pointer-to-member
9648 if (cp_cv_quals quals
= cp_type_quals (type
))
9650 tree unqual
= build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type
));
9651 return cp_build_qualified_type (unqual
, quals
);
9654 /* If a canonical type already exists for this type, use it. We use
9655 this method instead of type_hash_canon, because it only does a
9656 simple equality check on the list of field members. */
9658 t
= TYPE_PTRMEMFUNC_TYPE (type
);
9662 t
= make_node (RECORD_TYPE
);
9664 /* Let the front end know this is a pointer to member function. */
9665 TYPE_PTRMEMFUNC_FLAG (t
) = 1;
9667 field
= build_decl (input_location
, FIELD_DECL
, pfn_identifier
, type
);
9670 field
= build_decl (input_location
, FIELD_DECL
, delta_identifier
,
9672 DECL_CHAIN (field
) = fields
;
9675 finish_builtin_struct (t
, "__ptrmemfunc_type", fields
, ptr_type_node
);
9677 /* Zap out the name so that the back end will give us the debugging
9678 information for this anonymous RECORD_TYPE. */
9679 TYPE_NAME (t
) = NULL_TREE
;
9681 /* Cache this pointer-to-member type so that we can find it again
9683 TYPE_PTRMEMFUNC_TYPE (type
) = t
;
9685 if (TYPE_STRUCTURAL_EQUALITY_P (type
))
9686 SET_TYPE_STRUCTURAL_EQUALITY (t
);
9687 else if (TYPE_CANONICAL (type
) != type
)
9688 TYPE_CANONICAL (t
) = build_ptrmemfunc_type (TYPE_CANONICAL (type
));
9693 /* Create and return a pointer to data member type. */
9696 build_ptrmem_type (tree class_type
, tree member_type
)
9698 if (TREE_CODE (member_type
) == METHOD_TYPE
)
9700 cp_cv_quals quals
= type_memfn_quals (member_type
);
9701 cp_ref_qualifier rqual
= type_memfn_rqual (member_type
);
9702 member_type
= build_memfn_type (member_type
, class_type
, quals
, rqual
);
9703 return build_ptrmemfunc_type (build_pointer_type (member_type
));
9707 gcc_assert (TREE_CODE (member_type
) != FUNCTION_TYPE
);
9708 return build_offset_type (class_type
, member_type
);
9712 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
9713 Check to see that the definition is valid. Issue appropriate error
9717 check_static_variable_definition (tree decl
, tree type
)
9719 /* Avoid redundant diagnostics on out-of-class definitions. */
9720 if (!current_class_type
|| !TYPE_BEING_DEFINED (current_class_type
))
9722 /* Can't check yet if we don't know the type. */
9723 else if (dependent_type_p (type
))
9725 /* If DECL is declared constexpr, we'll do the appropriate checks
9726 in check_initializer. Similarly for inline static data members. */
9727 else if (DECL_P (decl
)
9728 && (DECL_DECLARED_CONSTEXPR_P (decl
)
9729 || undeduced_auto_decl (decl
)
9730 || DECL_VAR_DECLARED_INLINE_P (decl
)))
9732 else if (cxx_dialect
>= cxx11
&& !INTEGRAL_OR_ENUMERATION_TYPE_P (type
))
9734 if (!COMPLETE_TYPE_P (type
))
9735 error_at (DECL_SOURCE_LOCATION (decl
),
9736 "in-class initialization of static data member %q#D of "
9737 "incomplete type", decl
);
9738 else if (literal_type_p (type
))
9739 permerror (DECL_SOURCE_LOCATION (decl
),
9740 "%<constexpr%> needed for in-class initialization of "
9741 "static data member %q#D of non-integral type", decl
);
9743 error_at (DECL_SOURCE_LOCATION (decl
),
9744 "in-class initialization of static data member %q#D of "
9745 "non-literal type", decl
);
9747 /* Motion 10 at San Diego: If a static const integral data member is
9748 initialized with an integral constant expression, the initializer
9749 may appear either in the declaration (within the class), or in
9750 the definition, but not both. If it appears in the class, the
9751 member is a member constant. The file-scope definition is always
9753 else if (!ARITHMETIC_TYPE_P (type
) && TREE_CODE (type
) != ENUMERAL_TYPE
)
9754 error_at (DECL_SOURCE_LOCATION (decl
),
9755 "invalid in-class initialization of static data member "
9756 "of non-integral type %qT",
9758 else if (!CP_TYPE_CONST_P (type
))
9759 error_at (DECL_SOURCE_LOCATION (decl
),
9760 "ISO C++ forbids in-class initialization of non-const "
9761 "static member %qD",
9763 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type
))
9764 pedwarn (DECL_SOURCE_LOCATION (decl
), OPT_Wpedantic
,
9765 "ISO C++ forbids initialization of member constant "
9766 "%qD of non-integral type %qT", decl
, type
);
9769 /* *expr_p is part of the TYPE_SIZE of a variably-sized array. If any
9770 SAVE_EXPRs in *expr_p wrap expressions with side-effects, break those
9771 expressions out into temporary variables so that walk_tree doesn't
9772 step into them (c++/15764). */
9775 stabilize_save_expr_r (tree
*expr_p
, int *walk_subtrees
, void *data
)
9777 hash_set
<tree
> *pset
= (hash_set
<tree
> *)data
;
9778 tree expr
= *expr_p
;
9779 if (TREE_CODE (expr
) == SAVE_EXPR
)
9781 tree op
= TREE_OPERAND (expr
, 0);
9782 cp_walk_tree (&op
, stabilize_save_expr_r
, data
, pset
);
9783 if (TREE_SIDE_EFFECTS (op
))
9784 TREE_OPERAND (expr
, 0) = get_temp_regvar (TREE_TYPE (op
), op
);
9787 else if (!EXPR_P (expr
) || !TREE_SIDE_EFFECTS (expr
))
9792 /* Entry point for the above. */
9795 stabilize_vla_size (tree size
)
9797 hash_set
<tree
> pset
;
9798 /* Break out any function calls into temporary variables. */
9799 cp_walk_tree (&size
, stabilize_save_expr_r
, &pset
, &pset
);
9802 /* Reduce a SIZEOF_EXPR to its value. */
9805 fold_sizeof_expr (tree t
)
9808 if (SIZEOF_EXPR_TYPE_P (t
))
9809 r
= cxx_sizeof_or_alignof_type (TREE_TYPE (TREE_OPERAND (t
, 0)),
9810 SIZEOF_EXPR
, false, false);
9811 else if (TYPE_P (TREE_OPERAND (t
, 0)))
9812 r
= cxx_sizeof_or_alignof_type (TREE_OPERAND (t
, 0), SIZEOF_EXPR
,
9815 r
= cxx_sizeof_or_alignof_expr (TREE_OPERAND (t
, 0), SIZEOF_EXPR
,
9817 if (r
== error_mark_node
)
9822 /* Given the SIZE (i.e., number of elements) in an array, compute
9823 an appropriate index type for the array. If non-NULL, NAME is
9824 the name of the entity being declared. */
9827 compute_array_index_type_loc (location_t name_loc
, tree name
, tree size
,
9828 tsubst_flags_t complain
)
9830 if (error_operand_p (size
))
9831 return error_mark_node
;
9833 /* The type of the index being computed. */
9836 /* The original numeric size as seen in the source code before
9837 conversion to size_t. */
9838 tree origsize
= size
;
9840 location_t loc
= cp_expr_loc_or_loc (size
, name
? name_loc
: input_location
);
9842 if (!type_dependent_expression_p (size
))
9844 origsize
= size
= mark_rvalue_use (size
);
9846 if (cxx_dialect
< cxx11
&& TREE_CODE (size
) == NOP_EXPR
9847 && TREE_SIDE_EFFECTS (size
))
9848 /* In C++98, we mark a non-constant array bound with a magic
9849 NOP_EXPR with TREE_SIDE_EFFECTS; don't fold in that case. */;
9852 size
= instantiate_non_dependent_expr_sfinae (size
, complain
);
9853 size
= build_converted_constant_expr (size_type_node
, size
, complain
);
9854 /* Pedantically a constant expression is required here and so
9855 __builtin_is_constant_evaluated () should fold to true if it
9856 is successfully folded into a constant. */
9857 size
= maybe_constant_value (size
, NULL_TREE
,
9858 /*manifestly_const_eval=*/true);
9860 if (!TREE_CONSTANT (size
))
9864 if (error_operand_p (size
))
9865 return error_mark_node
;
9867 /* The array bound must be an integer type. */
9868 tree type
= TREE_TYPE (size
);
9869 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type
))
9871 if (!(complain
& tf_error
))
9872 return error_mark_node
;
9874 error_at (loc
, "size of array %qD has non-integral type %qT",
9877 error_at (loc
, "size of array has non-integral type %qT", type
);
9878 size
= integer_one_node
;
9882 /* A type is dependent if it is...an array type constructed from any
9883 dependent type or whose size is specified by a constant expression
9884 that is value-dependent. */
9885 /* We can only call value_dependent_expression_p on integral constant
9886 expressions; treat non-constant expressions as dependent, too. */
9887 if (processing_template_decl
9888 && (type_dependent_expression_p (size
)
9889 || !TREE_CONSTANT (size
) || value_dependent_expression_p (size
)))
9891 /* We cannot do any checking for a SIZE that isn't known to be
9892 constant. Just build the index type and mark that it requires
9893 structural equality checks. */
9894 itype
= build_index_type (build_min (MINUS_EXPR
, sizetype
,
9895 size
, size_one_node
));
9896 TYPE_DEPENDENT_P (itype
) = 1;
9897 TYPE_DEPENDENT_P_VALID (itype
) = 1;
9898 SET_TYPE_STRUCTURAL_EQUALITY (itype
);
9902 if (TREE_CODE (size
) != INTEGER_CST
)
9904 tree folded
= cp_fully_fold (size
);
9905 if (TREE_CODE (folded
) == INTEGER_CST
)
9908 pedwarn (loc
, OPT_Wpedantic
, "size of array %qD is not an "
9909 "integral constant-expression", name
);
9911 pedwarn (loc
, OPT_Wpedantic
,
9912 "size of array is not an integral constant-expression");
9914 /* Use the folded result for VLAs, too; it will have resolved
9919 /* Normally, the array-bound will be a constant. */
9920 if (TREE_CODE (size
) == INTEGER_CST
)
9922 /* The size to use in diagnostics that reflects the constant
9923 size used in the source, rather than SIZE massaged above. */
9924 tree diagsize
= size
;
9926 /* If the original size before conversion to size_t was signed
9927 and negative, convert it to ssizetype to restore the sign. */
9928 if (!TYPE_UNSIGNED (TREE_TYPE (origsize
))
9929 && TREE_CODE (size
) == INTEGER_CST
9930 && tree_int_cst_sign_bit (size
))
9932 diagsize
= fold_convert (ssizetype
, size
);
9934 /* Clear the overflow bit that may have been set as a result
9935 of the conversion from the sizetype of the new size to
9937 TREE_OVERFLOW (diagsize
) = false;
9940 /* Verify that the array has a positive number of elements
9941 and issue the appropriate diagnostic if it doesn't. */
9942 if (!valid_array_size_p (loc
, diagsize
, name
, (complain
& tf_error
)))
9944 if (!(complain
& tf_error
))
9945 return error_mark_node
;
9946 size
= integer_one_node
;
9948 /* As an extension we allow zero-sized arrays. */
9949 else if (integer_zerop (size
))
9951 if (!(complain
& tf_error
))
9952 /* We must fail if performing argument deduction (as
9953 indicated by the state of complain), so that
9954 another substitution can be found. */
9955 return error_mark_node
;
9956 else if (in_system_header_at (input_location
))
9957 /* Allow them in system headers because glibc uses them. */;
9959 pedwarn (loc
, OPT_Wpedantic
,
9960 "ISO C++ forbids zero-size array %qD", name
);
9962 pedwarn (loc
, OPT_Wpedantic
,
9963 "ISO C++ forbids zero-size array");
9966 else if (TREE_CONSTANT (size
)
9967 /* We don't allow VLAs at non-function scopes, or during
9968 tentative template substitution. */
9969 || !at_function_scope_p ()
9970 || !(complain
& tf_error
))
9972 if (!(complain
& tf_error
))
9973 return error_mark_node
;
9974 /* `(int) &fn' is not a valid array bound. */
9977 "size of array %qD is not an integral constant-expression",
9980 error_at (loc
, "size of array is not an integral constant-expression");
9981 size
= integer_one_node
;
9983 else if (pedantic
&& warn_vla
!= 0)
9986 pedwarn (name_loc
, OPT_Wvla
,
9987 "ISO C++ forbids variable length array %qD", name
);
9989 pedwarn (input_location
, OPT_Wvla
,
9990 "ISO C++ forbids variable length array");
9992 else if (warn_vla
> 0)
9995 warning_at (name_loc
, OPT_Wvla
,
9996 "variable length array %qD is used", name
);
9999 "variable length array is used");
10002 if (processing_template_decl
&& !TREE_CONSTANT (size
))
10003 /* A variable sized array. */
10004 itype
= build_min (MINUS_EXPR
, sizetype
, size
, integer_one_node
);
10007 /* Compute the index of the largest element in the array. It is
10008 one less than the number of elements in the array. We save
10009 and restore PROCESSING_TEMPLATE_DECL so that computations in
10010 cp_build_binary_op will be appropriately folded. */
10012 processing_template_decl_sentinel s
;
10013 itype
= cp_build_binary_op (input_location
,
10015 cp_convert (ssizetype
, size
, complain
),
10016 cp_convert (ssizetype
, integer_one_node
,
10019 itype
= maybe_constant_value (itype
);
10022 if (!TREE_CONSTANT (itype
))
10024 /* A variable sized array. */
10025 itype
= variable_size (itype
);
10027 stabilize_vla_size (itype
);
10029 if (sanitize_flags_p (SANITIZE_VLA
)
10030 && current_function_decl
!= NULL_TREE
)
10032 /* We have to add 1 -- in the ubsan routine we generate
10033 LE_EXPR rather than LT_EXPR. */
10034 tree t
= fold_build2 (PLUS_EXPR
, TREE_TYPE (itype
), itype
,
10035 build_one_cst (TREE_TYPE (itype
)));
10036 t
= ubsan_instrument_vla (input_location
, t
);
10037 finish_expr_stmt (t
);
10040 /* Make sure that there was no overflow when creating to a signed
10041 index type. (For example, on a 32-bit machine, an array with
10042 size 2^32 - 1 is too big.) */
10043 else if (TREE_CODE (itype
) == INTEGER_CST
10044 && TREE_OVERFLOW (itype
))
10046 if (!(complain
& tf_error
))
10047 return error_mark_node
;
10048 error ("overflow in array dimension");
10049 TREE_OVERFLOW (itype
) = 0;
10053 /* Create and return the appropriate index type. */
10054 itype
= build_index_type (itype
);
10056 /* If the index type were dependent, we would have returned early, so
10057 remember that it isn't. */
10058 TYPE_DEPENDENT_P (itype
) = 0;
10059 TYPE_DEPENDENT_P_VALID (itype
) = 1;
10064 compute_array_index_type (tree name
, tree size
, tsubst_flags_t complain
)
10066 return compute_array_index_type_loc (input_location
, name
, size
, complain
);
10069 /* Returns the scope (if any) in which the entity declared by
10070 DECLARATOR will be located. If the entity was declared with an
10071 unqualified name, NULL_TREE is returned. */
10074 get_scope_of_declarator (const cp_declarator
*declarator
)
10076 while (declarator
&& declarator
->kind
!= cdk_id
)
10077 declarator
= declarator
->declarator
;
10079 /* If the declarator-id is a SCOPE_REF, the scope in which the
10080 declaration occurs is the first operand. */
10082 && declarator
->u
.id
.qualifying_scope
)
10083 return declarator
->u
.id
.qualifying_scope
;
10085 /* Otherwise, the declarator is not a qualified name; the entity will
10086 be declared in the current scope. */
10090 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
10091 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
10095 create_array_type_for_decl (tree name
, tree type
, tree size
, location_t loc
)
10097 tree itype
= NULL_TREE
;
10099 /* If things have already gone awry, bail now. */
10100 if (type
== error_mark_node
|| size
== error_mark_node
)
10101 return error_mark_node
;
10103 /* 8.3.4/1: If the type of the identifier of D contains the auto
10104 type-specifier, the program is ill-formed. */
10105 if (type_uses_auto (type
))
10108 error_at (loc
, "%qD declared as array of %qT", name
, type
);
10110 error ("creating array of %qT", type
);
10111 return error_mark_node
;
10114 /* If there are some types which cannot be array elements,
10115 issue an error-message and return. */
10116 switch (TREE_CODE (type
))
10120 error_at (loc
, "declaration of %qD as array of void", name
);
10122 error ("creating array of void");
10123 return error_mark_node
;
10125 case FUNCTION_TYPE
:
10127 error_at (loc
, "declaration of %qD as array of functions", name
);
10129 error ("creating array of functions");
10130 return error_mark_node
;
10132 case REFERENCE_TYPE
:
10134 error_at (loc
, "declaration of %qD as array of references", name
);
10136 error ("creating array of references");
10137 return error_mark_node
;
10141 error_at (loc
, "declaration of %qD as array of function members",
10144 error ("creating array of function members");
10145 return error_mark_node
;
10153 The constant expressions that specify the bounds of the arrays
10154 can be omitted only for the first member of the sequence. */
10155 if (TREE_CODE (type
) == ARRAY_TYPE
&& !TYPE_DOMAIN (type
))
10158 error_at (loc
, "declaration of %qD as multidimensional array must "
10159 "have bounds for all dimensions except the first",
10162 error ("multidimensional array must have bounds for all "
10163 "dimensions except the first");
10165 return error_mark_node
;
10168 /* Figure out the index type for the array. */
10170 itype
= compute_array_index_type_loc (loc
, name
, size
,
10171 tf_warning_or_error
);
10174 T is called the array element type; this type shall not be [...] an
10175 abstract class type. */
10176 abstract_virtuals_error (name
, type
);
10178 return build_cplus_array_type (type
, itype
);
10181 /* Returns the smallest location that is not UNKNOWN_LOCATION. */
10184 min_location (location_t loca
, location_t locb
)
10186 if (loca
== UNKNOWN_LOCATION
10187 || (locb
!= UNKNOWN_LOCATION
10188 && linemap_location_before_p (line_table
, locb
, loca
)))
10193 /* Returns the smallest location != UNKNOWN_LOCATION among the
10194 three stored in LOCATIONS[ds_const], LOCATIONS[ds_volatile],
10195 and LOCATIONS[ds_restrict]. */
10198 smallest_type_quals_location (int type_quals
, const location_t
* locations
)
10200 location_t loc
= UNKNOWN_LOCATION
;
10202 if (type_quals
& TYPE_QUAL_CONST
)
10203 loc
= locations
[ds_const
];
10205 if (type_quals
& TYPE_QUAL_VOLATILE
)
10206 loc
= min_location (loc
, locations
[ds_volatile
]);
10208 if (type_quals
& TYPE_QUAL_RESTRICT
)
10209 loc
= min_location (loc
, locations
[ds_restrict
]);
10214 /* Returns the smallest among the latter and locations[ds_type_spec]. */
10217 smallest_type_location (int type_quals
, const location_t
* locations
)
10219 location_t loc
= smallest_type_quals_location (type_quals
, locations
);
10220 return min_location (loc
, locations
[ds_type_spec
]);
10224 smallest_type_location (const cp_decl_specifier_seq
*declspecs
)
10226 int type_quals
= get_type_quals (declspecs
);
10227 return smallest_type_location (type_quals
, declspecs
->locations
);
10230 /* Check that it's OK to declare a function with the indicated TYPE
10231 and TYPE_QUALS. SFK indicates the kind of special function (if any)
10232 that this function is. OPTYPE is the type given in a conversion
10233 operator declaration, or the class type for a constructor/destructor.
10234 Returns the actual return type of the function; that may be different
10235 than TYPE if an error occurs, or for certain special functions. */
10238 check_special_function_return_type (special_function_kind sfk
,
10242 const location_t
* locations
)
10246 case sfk_constructor
:
10248 error_at (smallest_type_location (type_quals
, locations
),
10249 "return type specification for constructor invalid");
10250 else if (type_quals
!= TYPE_UNQUALIFIED
)
10251 error_at (smallest_type_quals_location (type_quals
, locations
),
10252 "qualifiers are not allowed on constructor declaration");
10254 if (targetm
.cxx
.cdtor_returns_this ())
10255 type
= build_pointer_type (optype
);
10257 type
= void_type_node
;
10260 case sfk_destructor
:
10262 error_at (smallest_type_location (type_quals
, locations
),
10263 "return type specification for destructor invalid");
10264 else if (type_quals
!= TYPE_UNQUALIFIED
)
10265 error_at (smallest_type_quals_location (type_quals
, locations
),
10266 "qualifiers are not allowed on destructor declaration");
10268 /* We can't use the proper return type here because we run into
10269 problems with ambiguous bases and covariant returns. */
10270 if (targetm
.cxx
.cdtor_returns_this ())
10271 type
= build_pointer_type (void_type_node
);
10273 type
= void_type_node
;
10276 case sfk_conversion
:
10278 error_at (smallest_type_location (type_quals
, locations
),
10279 "return type specified for %<operator %T%>", optype
);
10280 else if (type_quals
!= TYPE_UNQUALIFIED
)
10281 error_at (smallest_type_quals_location (type_quals
, locations
),
10282 "qualifiers are not allowed on declaration of "
10283 "%<operator %T%>", optype
);
10288 case sfk_deduction_guide
:
10290 error_at (smallest_type_location (type_quals
, locations
),
10291 "return type specified for deduction guide");
10292 else if (type_quals
!= TYPE_UNQUALIFIED
)
10293 error_at (smallest_type_quals_location (type_quals
, locations
),
10294 "qualifiers are not allowed on declaration of "
10295 "deduction guide");
10296 if (TREE_CODE (optype
) == TEMPLATE_TEMPLATE_PARM
)
10298 error ("template template parameter %qT in declaration of "
10299 "deduction guide", optype
);
10300 type
= error_mark_node
;
10303 type
= make_template_placeholder (CLASSTYPE_TI_TEMPLATE (optype
));
10304 for (int i
= 0; i
< ds_last
; ++i
)
10305 if (i
!= ds_explicit
&& locations
[i
])
10306 error_at (locations
[i
],
10307 "%<decl-specifier%> in declaration of deduction guide");
10311 gcc_unreachable ();
10317 /* A variable or data member (whose unqualified name is IDENTIFIER)
10318 has been declared with the indicated TYPE. If the TYPE is not
10319 acceptable, issue an error message and return a type to use for
10320 error-recovery purposes. */
10323 check_var_type (tree identifier
, tree type
, location_t loc
)
10325 if (VOID_TYPE_P (type
))
10328 error_at (loc
, "unnamed variable or field declared void");
10329 else if (identifier_p (identifier
))
10331 gcc_assert (!IDENTIFIER_ANY_OP_P (identifier
));
10332 error_at (loc
, "variable or field %qE declared void",
10336 error_at (loc
, "variable or field declared void");
10337 type
= error_mark_node
;
10343 /* Handle declaring DECL as an inline variable. */
10346 mark_inline_variable (tree decl
, location_t loc
)
10348 bool inlinep
= true;
10349 if (! toplevel_bindings_p ())
10351 error_at (loc
, "%<inline%> specifier invalid for variable "
10352 "%qD declared at block scope", decl
);
10355 else if (cxx_dialect
< cxx17
)
10356 pedwarn (loc
, 0, "inline variables are only available "
10357 "with %<-std=c++17%> or %<-std=gnu++17%>");
10360 retrofit_lang_decl (decl
);
10361 SET_DECL_VAR_DECLARED_INLINE_P (decl
);
10366 /* Assign a typedef-given name to a class or enumeration type declared
10367 as anonymous at first. This was split out of grokdeclarator
10368 because it is also used in libcc1. */
10371 name_unnamed_type (tree type
, tree decl
)
10373 gcc_assert (TYPE_UNNAMED_P (type
));
10375 /* Replace the anonymous name with the real name everywhere. */
10376 for (tree t
= TYPE_MAIN_VARIANT (type
); t
; t
= TYPE_NEXT_VARIANT (t
))
10377 if (IDENTIFIER_ANON_P (TYPE_IDENTIFIER (t
)))
10378 /* We do not rename the debug info representing the unnamed
10379 tagged type because the standard says in [dcl.typedef] that
10380 the naming applies only for linkage purposes. */
10381 /*debug_hooks->set_name (t, decl);*/
10382 TYPE_NAME (t
) = decl
;
10384 if (TYPE_LANG_SPECIFIC (type
))
10385 TYPE_WAS_UNNAMED (type
) = 1;
10387 /* If this is a typedef within a template class, the nested
10388 type is a (non-primary) template. The name for the
10389 template needs updating as well. */
10390 if (TYPE_LANG_SPECIFIC (type
) && CLASSTYPE_TEMPLATE_INFO (type
))
10391 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type
))
10392 = TYPE_IDENTIFIER (type
);
10394 /* Adjust linkage now that we aren't unnamed anymore. */
10395 reset_type_linkage (type
);
10397 /* FIXME remangle member functions; member functions of a
10398 type with external linkage have external linkage. */
10400 /* Check that our job is done, and that it would fail if we
10401 attempted to do it again. */
10402 gcc_assert (!TYPE_UNNAMED_P (type
));
10405 /* Given declspecs and a declarator (abstract or otherwise), determine
10406 the name and type of the object declared and construct a DECL node
10409 DECLSPECS points to the representation of declaration-specifier
10410 sequence that precedes declarator.
10412 DECL_CONTEXT says which syntactic context this declaration is in:
10413 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
10414 FUNCDEF for a function definition. Like NORMAL but a few different
10415 error messages in each case. Return value may be zero meaning
10416 this definition is too screwy to try to parse.
10417 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
10418 handle member functions (which have FIELD context).
10419 Return value may be zero meaning this definition is too screwy to
10421 PARM for a parameter declaration (either within a function prototype
10422 or before a function body). Make a PARM_DECL, or return void_type_node.
10423 TPARM for a template parameter declaration.
10424 CATCHPARM for a parameter declaration before a catch clause.
10425 TYPENAME if for a typename (in a cast or sizeof).
10426 Don't make a DECL node; just return the ..._TYPE node.
10427 FIELD for a struct or union field; make a FIELD_DECL.
10428 BITFIELD for a field with specified width.
10430 INITIALIZED is as for start_decl.
10432 ATTRLIST is a pointer to the list of attributes, which may be NULL
10433 if there are none; *ATTRLIST may be modified if attributes from inside
10434 the declarator should be applied to the declaration.
10436 When this function is called, scoping variables (such as
10437 CURRENT_CLASS_TYPE) should reflect the scope in which the
10438 declaration occurs, not the scope in which the new declaration will
10439 be placed. For example, on:
10441 void S::f() { ... }
10443 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
10446 Returns a DECL (if a declarator is present), a TYPE (if there is no
10447 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
10451 grokdeclarator (const cp_declarator
*declarator
,
10452 cp_decl_specifier_seq
*declspecs
,
10453 enum decl_context decl_context
,
10457 tree type
= NULL_TREE
;
10459 int explicit_intN
= 0;
10461 int virtualp
, explicitp
, friendp
, inlinep
, staticp
;
10462 int explicit_int
= 0;
10463 int explicit_char
= 0;
10464 int defaulted_int
= 0;
10466 tree typedef_decl
= NULL_TREE
;
10467 const char *name
= NULL
;
10468 tree typedef_type
= NULL_TREE
;
10469 /* True if this declarator is a function definition. */
10470 bool funcdef_flag
= false;
10471 cp_declarator_kind innermost_code
= cdk_error
;
10474 /* See the code below that used this. */
10475 tree decl_attr
= NULL_TREE
;
10478 /* Keep track of what sort of function is being processed
10479 so that we can warn about default return values, or explicit
10480 return values which do not match prescribed defaults. */
10481 special_function_kind sfk
= sfk_none
;
10483 tree dname
= NULL_TREE
;
10484 tree ctor_return_type
= NULL_TREE
;
10485 enum overload_flags flags
= NO_SPECIAL
;
10486 /* cv-qualifiers that apply to the declarator, for a declaration of
10487 a member function. */
10488 cp_cv_quals memfn_quals
= TYPE_UNQUALIFIED
;
10489 /* virt-specifiers that apply to the declarator, for a declaration of
10490 a member function. */
10491 cp_virt_specifiers virt_specifiers
= VIRT_SPEC_UNSPECIFIED
;
10492 /* ref-qualifier that applies to the declarator, for a declaration of
10493 a member function. */
10494 cp_ref_qualifier rqual
= REF_QUAL_NONE
;
10495 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
10496 int type_quals
= get_type_quals (declspecs
);
10497 tree raises
= NULL_TREE
;
10498 int template_count
= 0;
10499 tree returned_attrs
= NULL_TREE
;
10500 tree parms
= NULL_TREE
;
10501 const cp_declarator
*id_declarator
;
10502 /* The unqualified name of the declarator; either an
10503 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
10504 tree unqualified_id
;
10505 /* The class type, if any, in which this entity is located,
10506 or NULL_TREE if none. Note that this value may be different from
10507 the current class type; for example if an attempt is made to declare
10508 "A::f" inside "B", this value will be "A". */
10509 tree ctype
= current_class_type
;
10510 /* The NAMESPACE_DECL for the namespace in which this entity is
10511 located. If an unqualified name is used to declare the entity,
10512 this value will be NULL_TREE, even if the entity is located at
10513 namespace scope. */
10514 tree in_namespace
= NULL_TREE
;
10515 cp_storage_class storage_class
;
10516 bool unsigned_p
, signed_p
, short_p
, long_p
, thread_p
;
10517 bool type_was_error_mark_node
= false;
10518 bool parameter_pack_p
= declarator
? declarator
->parameter_pack_p
: false;
10519 bool template_type_arg
= false;
10520 bool template_parm_flag
= false;
10521 bool typedef_p
= decl_spec_seq_has_spec_p (declspecs
, ds_typedef
);
10522 bool constexpr_p
= decl_spec_seq_has_spec_p (declspecs
, ds_constexpr
);
10523 bool constinit_p
= decl_spec_seq_has_spec_p (declspecs
, ds_constinit
);
10524 bool late_return_type_p
= false;
10525 bool array_parameter_p
= false;
10526 location_t saved_loc
= input_location
;
10527 tree reqs
= NULL_TREE
;
10529 signed_p
= decl_spec_seq_has_spec_p (declspecs
, ds_signed
);
10530 unsigned_p
= decl_spec_seq_has_spec_p (declspecs
, ds_unsigned
);
10531 short_p
= decl_spec_seq_has_spec_p (declspecs
, ds_short
);
10532 long_p
= decl_spec_seq_has_spec_p (declspecs
, ds_long
);
10533 longlong
= decl_spec_seq_has_spec_p (declspecs
, ds_long_long
);
10534 explicit_intN
= declspecs
->explicit_intN_p
;
10535 int_n_alt
= declspecs
->int_n_alt
;
10536 thread_p
= decl_spec_seq_has_spec_p (declspecs
, ds_thread
);
10538 // Was concept_p specified? Note that ds_concept
10539 // implies ds_constexpr!
10540 bool concept_p
= decl_spec_seq_has_spec_p (declspecs
, ds_concept
);
10542 constexpr_p
= true;
10544 if (decl_context
== FUNCDEF
)
10545 funcdef_flag
= true, decl_context
= NORMAL
;
10546 else if (decl_context
== MEMFUNCDEF
)
10547 funcdef_flag
= true, decl_context
= FIELD
;
10548 else if (decl_context
== BITFIELD
)
10549 bitfield
= 1, decl_context
= FIELD
;
10550 else if (decl_context
== TEMPLATE_TYPE_ARG
)
10551 template_type_arg
= true, decl_context
= TYPENAME
;
10552 else if (decl_context
== TPARM
)
10553 template_parm_flag
= true, decl_context
= PARM
;
10555 if (initialized
> 1)
10556 funcdef_flag
= true;
10558 location_t typespec_loc
= smallest_type_location (type_quals
,
10559 declspecs
->locations
);
10560 if (typespec_loc
== UNKNOWN_LOCATION
)
10561 typespec_loc
= input_location
;
10563 location_t id_loc
= declarator
? declarator
->id_loc
: input_location
;
10564 if (id_loc
== UNKNOWN_LOCATION
)
10565 id_loc
= input_location
;
10567 /* Look inside a declarator for the name being declared
10568 and get it as a string, for an error message. */
10569 for (id_declarator
= declarator
;
10571 id_declarator
= id_declarator
->declarator
)
10573 if (id_declarator
->kind
!= cdk_id
)
10574 innermost_code
= id_declarator
->kind
;
10576 switch (id_declarator
->kind
)
10579 if (id_declarator
->declarator
10580 && id_declarator
->declarator
->kind
== cdk_id
)
10582 sfk
= id_declarator
->declarator
->u
.id
.sfk
;
10583 if (sfk
== sfk_destructor
)
10590 tree qualifying_scope
= id_declarator
->u
.id
.qualifying_scope
;
10591 tree decl
= id_declarator
->u
.id
.unqualified_name
;
10594 if (qualifying_scope
)
10596 if (check_for_bare_parameter_packs (qualifying_scope
,
10597 id_declarator
->id_loc
))
10598 return error_mark_node
;
10599 if (at_function_scope_p ())
10603 A declarator-id shall not be qualified except
10606 None of the cases are permitted in block
10608 if (qualifying_scope
== global_namespace
)
10609 error ("invalid use of qualified-name %<::%D%>",
10611 else if (TYPE_P (qualifying_scope
))
10612 error ("invalid use of qualified-name %<%T::%D%>",
10613 qualifying_scope
, decl
);
10615 error ("invalid use of qualified-name %<%D::%D%>",
10616 qualifying_scope
, decl
);
10617 return error_mark_node
;
10619 else if (TYPE_P (qualifying_scope
))
10621 ctype
= qualifying_scope
;
10622 if (!MAYBE_CLASS_TYPE_P (ctype
))
10624 error_at (id_declarator
->id_loc
,
10625 "%q#T is not a class or namespace", ctype
);
10628 else if (innermost_code
!= cdk_function
10629 && current_class_type
10630 && !uniquely_derived_from_p (ctype
,
10631 current_class_type
))
10633 error_at (id_declarator
->id_loc
,
10634 "invalid use of qualified-name %<%T::%D%>",
10635 qualifying_scope
, decl
);
10636 return error_mark_node
;
10639 else if (TREE_CODE (qualifying_scope
) == NAMESPACE_DECL
)
10640 in_namespace
= qualifying_scope
;
10642 switch (TREE_CODE (decl
))
10646 if (innermost_code
!= cdk_function
)
10648 error_at (EXPR_LOCATION (decl
),
10649 "declaration of %qE as non-function", decl
);
10650 return error_mark_node
;
10652 else if (!qualifying_scope
10653 && !(current_class_type
&& at_class_scope_p ()))
10655 error_at (EXPR_LOCATION (decl
),
10656 "declaration of %qE as non-member", decl
);
10657 return error_mark_node
;
10660 tree type
= TREE_OPERAND (decl
, 0);
10662 type
= constructor_name (type
);
10663 name
= identifier_to_locale (IDENTIFIER_POINTER (type
));
10668 case TEMPLATE_ID_EXPR
:
10670 tree fns
= TREE_OPERAND (decl
, 0);
10673 if (!identifier_p (dname
))
10674 dname
= OVL_NAME (dname
);
10676 /* Fall through. */
10678 case IDENTIFIER_NODE
:
10679 if (identifier_p (decl
))
10682 if (IDENTIFIER_KEYWORD_P (dname
))
10684 error ("declarator-id missing; using reserved word %qD",
10686 name
= identifier_to_locale (IDENTIFIER_POINTER (dname
));
10688 else if (!IDENTIFIER_CONV_OP_P (dname
))
10689 name
= identifier_to_locale (IDENTIFIER_POINTER (dname
));
10692 gcc_assert (flags
== NO_SPECIAL
);
10693 flags
= TYPENAME_FLAG
;
10694 sfk
= sfk_conversion
;
10695 tree glob
= get_global_binding (dname
);
10696 if (glob
&& TREE_CODE (glob
) == TYPE_DECL
)
10697 name
= identifier_to_locale (IDENTIFIER_POINTER (dname
));
10699 name
= "<invalid operator>";
10704 gcc_unreachable ();
10711 case cdk_reference
:
10716 name
= "structured binding";
10720 return error_mark_node
;
10723 gcc_unreachable ();
10725 if (id_declarator
->kind
== cdk_id
)
10731 The declarator in a function-definition shall have the form
10732 D1 ( parameter-declaration-clause) ... */
10733 if (funcdef_flag
&& innermost_code
!= cdk_function
)
10735 error_at (id_loc
, "function definition does not declare parameters");
10736 return error_mark_node
;
10739 if (flags
== TYPENAME_FLAG
10740 && innermost_code
!= cdk_function
10741 && ! (ctype
&& !declspecs
->any_specifiers_p
))
10743 error_at (id_loc
, "declaration of %qD as non-function", dname
);
10744 return error_mark_node
;
10747 if (dname
&& identifier_p (dname
))
10749 if (UDLIT_OPER_P (dname
)
10750 && innermost_code
!= cdk_function
)
10752 error_at (id_loc
, "declaration of %qD as non-function", dname
);
10753 return error_mark_node
;
10756 if (IDENTIFIER_ANY_OP_P (dname
))
10760 error_at (id_loc
, "declaration of %qD as %<typedef%>", dname
);
10761 return error_mark_node
;
10763 else if (decl_context
== PARM
|| decl_context
== CATCHPARM
)
10765 error_at (id_loc
, "declaration of %qD as parameter", dname
);
10766 return error_mark_node
;
10771 /* Anything declared one level down from the top level
10772 must be one of the parameters of a function
10773 (because the body is at least two levels down). */
10775 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
10776 by not allowing C++ class definitions to specify their parameters
10777 with xdecls (must be spec.d in the parmlist).
10779 Since we now wait to push a class scope until we are sure that
10780 we are in a legitimate method context, we must set oldcname
10781 explicitly (since current_class_name is not yet alive).
10783 We also want to avoid calling this a PARM if it is in a namespace. */
10785 if (decl_context
== NORMAL
&& !toplevel_bindings_p ())
10787 cp_binding_level
*b
= current_binding_level
;
10788 current_binding_level
= b
->level_chain
;
10789 if (current_binding_level
!= 0 && toplevel_bindings_p ())
10790 decl_context
= PARM
;
10791 current_binding_level
= b
;
10795 name
= decl_context
== PARM
? "parameter" : "type name";
10797 if (concept_p
&& typedef_p
)
10799 error_at (declspecs
->locations
[ds_concept
],
10800 "%<concept%> cannot appear in a typedef declaration");
10801 return error_mark_node
;
10804 if (constexpr_p
&& typedef_p
)
10806 error_at (declspecs
->locations
[ds_constexpr
],
10807 "%<constexpr%> cannot appear in a typedef declaration");
10808 return error_mark_node
;
10811 if (constinit_p
&& typedef_p
)
10813 error_at (declspecs
->locations
[ds_constinit
],
10814 "%<constinit%> cannot appear in a typedef declaration");
10815 return error_mark_node
;
10818 /* [dcl.spec]/2 "At most one of the constexpr, consteval, and constinit
10819 keywords shall appear in a decl-specifier-seq." */
10820 if (constinit_p
&& constexpr_p
)
10822 gcc_rich_location
richloc (declspecs
->locations
[ds_constinit
]);
10823 richloc
.add_range (declspecs
->locations
[ds_constexpr
]);
10824 error_at (&richloc
,
10825 "can use at most one of the %<constinit%> and %<constexpr%> "
10827 return error_mark_node
;
10830 /* If there were multiple types specified in the decl-specifier-seq,
10831 issue an error message. */
10832 if (declspecs
->multiple_types_p
)
10834 error_at (typespec_loc
,
10835 "two or more data types in declaration of %qs", name
);
10836 return error_mark_node
;
10839 if (declspecs
->conflicting_specifiers_p
)
10841 error_at (min_location (declspecs
->locations
[ds_typedef
],
10842 declspecs
->locations
[ds_storage_class
]),
10843 "conflicting specifiers in declaration of %qs", name
);
10844 return error_mark_node
;
10847 /* Extract the basic type from the decl-specifier-seq. */
10848 type
= declspecs
->type
;
10849 if (type
== error_mark_node
)
10852 type_was_error_mark_node
= true;
10854 cp_warn_deprecated_use (type
);
10855 if (type
&& TREE_CODE (type
) == TYPE_DECL
)
10857 cp_warn_deprecated_use_scopes (CP_DECL_CONTEXT (type
));
10858 typedef_decl
= type
;
10859 type
= TREE_TYPE (typedef_decl
);
10860 if (DECL_ARTIFICIAL (typedef_decl
))
10861 cp_warn_deprecated_use (type
);
10863 /* No type at all: default to `int', and set DEFAULTED_INT
10864 because it was not a user-defined typedef. */
10865 if (type
== NULL_TREE
)
10867 if (signed_p
|| unsigned_p
|| long_p
|| short_p
)
10869 /* These imply 'int'. */
10870 type
= integer_type_node
;
10873 /* If we just have "complex", it is equivalent to "complex double". */
10874 else if (!longlong
&& !explicit_intN
10875 && decl_spec_seq_has_spec_p (declspecs
, ds_complex
))
10877 type
= double_type_node
;
10878 pedwarn (declspecs
->locations
[ds_complex
], OPT_Wpedantic
,
10879 "ISO C++ does not support plain %<complex%> meaning "
10880 "%<double complex%>");
10883 /* Gather flags. */
10884 explicit_int
= declspecs
->explicit_int_p
;
10885 explicit_char
= declspecs
->explicit_char_p
;
10888 /* See the code below that used this. */
10890 decl_attr
= DECL_ATTRIBUTES (typedef_decl
);
10892 typedef_type
= type
;
10894 if (sfk
== sfk_conversion
|| sfk
== sfk_deduction_guide
)
10895 ctor_return_type
= TREE_TYPE (dname
);
10897 ctor_return_type
= ctype
;
10899 if (sfk
!= sfk_none
)
10901 type
= check_special_function_return_type (sfk
, type
,
10904 declspecs
->locations
);
10905 type_quals
= TYPE_UNQUALIFIED
;
10907 else if (type
== NULL_TREE
)
10913 /* We handle `main' specially here, because 'main () { }' is so
10914 common. With no options, it is allowed. With -Wreturn-type,
10915 it is a warning. It is only an error with -pedantic-errors. */
10916 is_main
= (funcdef_flag
10917 && dname
&& identifier_p (dname
)
10918 && MAIN_NAME_P (dname
)
10919 && ctype
== NULL_TREE
10920 && in_namespace
== NULL_TREE
10921 && current_namespace
== global_namespace
);
10923 if (type_was_error_mark_node
)
10924 /* We've already issued an error, don't complain more. */;
10925 else if (in_system_header_at (input_location
) || flag_ms_extensions
)
10926 /* Allow it, sigh. */;
10927 else if (! is_main
)
10928 permerror (id_loc
, "ISO C++ forbids declaration of %qs with no type",
10931 pedwarn (id_loc
, OPT_Wpedantic
,
10932 "ISO C++ forbids declaration of %qs with no type", name
);
10934 warning_at (id_loc
, OPT_Wreturn_type
,
10935 "ISO C++ forbids declaration of %qs with no type", name
);
10937 if (type_was_error_mark_node
&& template_parm_flag
)
10938 /* FIXME we should be able to propagate the error_mark_node as is
10939 for other contexts too. */
10940 type
= error_mark_node
;
10942 type
= integer_type_node
;
10949 if (! int_n_enabled_p
[declspecs
->int_n_idx
])
10951 error_at (declspecs
->locations
[ds_type_spec
],
10952 "%<__int%d%> is not supported by this target",
10953 int_n_data
[declspecs
->int_n_idx
].bitsize
);
10954 explicit_intN
= false;
10956 /* Don't pedwarn if the alternate "__intN__" form has been used instead
10958 else if (!int_n_alt
&& pedantic
&& ! in_system_header_at (input_location
))
10959 pedwarn (declspecs
->locations
[ds_type_spec
], OPT_Wpedantic
,
10960 "ISO C++ does not support %<__int%d%> for %qs",
10961 int_n_data
[declspecs
->int_n_idx
].bitsize
, name
);
10964 /* Now process the modifiers that were specified
10965 and check for invalid combinations. */
10967 /* Long double is a special combination. */
10968 if (long_p
&& !longlong
&& TYPE_MAIN_VARIANT (type
) == double_type_node
)
10971 type
= cp_build_qualified_type (long_double_type_node
,
10972 cp_type_quals (type
));
10975 /* Check all other uses of type modifiers. */
10977 if (unsigned_p
|| signed_p
|| long_p
|| short_p
)
10984 loc
= declspecs
->locations
[ds_unsigned
];
10989 loc
= declspecs
->locations
[ds_signed
];
10994 loc
= declspecs
->locations
[ds_long_long
];
10999 loc
= declspecs
->locations
[ds_long
];
11001 else /* if (short_p) */
11004 loc
= declspecs
->locations
[ds_short
];
11009 if (signed_p
&& unsigned_p
)
11011 gcc_rich_location
richloc (declspecs
->locations
[ds_signed
]);
11012 richloc
.add_range (declspecs
->locations
[ds_unsigned
]);
11013 error_at (&richloc
,
11014 "%<signed%> and %<unsigned%> specified together");
11016 else if (long_p
&& short_p
)
11018 gcc_rich_location
richloc (declspecs
->locations
[ds_long
]);
11019 richloc
.add_range (declspecs
->locations
[ds_short
]);
11020 error_at (&richloc
, "%<long%> and %<short%> specified together");
11022 else if (TREE_CODE (type
) != INTEGER_TYPE
11023 || type
== char8_type_node
11024 || type
== char16_type_node
11025 || type
== char32_type_node
11026 || ((long_p
|| short_p
)
11027 && (explicit_char
|| explicit_intN
)))
11028 error_at (loc
, "%qs specified with %qT", key
, type
);
11029 else if (!explicit_int
&& !defaulted_int
11030 && !explicit_char
&& !explicit_intN
)
11034 pedwarn (loc
, OPT_Wpedantic
, "%qs specified with %qT",
11036 ok
= !flag_pedantic_errors
;
11038 else if (declspecs
->decltype_p
)
11039 error_at (loc
, "%qs specified with %<decltype%>", key
);
11041 error_at (loc
, "%qs specified with %<typeof%>", key
);
11046 /* Discard the type modifiers if they are invalid. */
11049 unsigned_p
= false;
11057 /* Decide whether an integer type is signed or not.
11058 Optionally treat bitfields as signed by default. */
11062 It is implementation-defined whether a plain (neither
11063 explicitly signed or unsigned) char, short, int, or long
11064 bit-field is signed or unsigned.
11066 Naturally, we extend this to long long as well. Note that
11067 this does not include wchar_t. */
11068 || (bitfield
&& !flag_signed_bitfields
11070 /* A typedef for plain `int' without `signed' can be
11071 controlled just like plain `int', but a typedef for
11072 `signed int' cannot be so controlled. */
11074 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
))
11075 && TREE_CODE (type
) == INTEGER_TYPE
11076 && !same_type_p (TYPE_MAIN_VARIANT (type
), wchar_type_node
)))
11079 type
= int_n_trees
[declspecs
->int_n_idx
].unsigned_type
;
11081 type
= long_long_unsigned_type_node
;
11083 type
= long_unsigned_type_node
;
11085 type
= short_unsigned_type_node
;
11086 else if (type
== char_type_node
)
11087 type
= unsigned_char_type_node
;
11088 else if (typedef_decl
)
11089 type
= unsigned_type_for (type
);
11091 type
= unsigned_type_node
;
11093 else if (signed_p
&& type
== char_type_node
)
11094 type
= signed_char_type_node
;
11095 else if (explicit_intN
)
11096 type
= int_n_trees
[declspecs
->int_n_idx
].signed_type
;
11098 type
= long_long_integer_type_node
;
11100 type
= long_integer_type_node
;
11102 type
= short_integer_type_node
;
11104 if (decl_spec_seq_has_spec_p (declspecs
, ds_complex
))
11106 if (TREE_CODE (type
) != INTEGER_TYPE
&& TREE_CODE (type
) != REAL_TYPE
)
11107 error_at (declspecs
->locations
[ds_complex
],
11108 "complex invalid for %qs", name
);
11109 /* If a modifier is specified, the resulting complex is the complex
11110 form of TYPE. E.g, "complex short" is "complex short int". */
11111 else if (type
== integer_type_node
)
11112 type
= complex_integer_type_node
;
11113 else if (type
== float_type_node
)
11114 type
= complex_float_type_node
;
11115 else if (type
== double_type_node
)
11116 type
= complex_double_type_node
;
11117 else if (type
== long_double_type_node
)
11118 type
= complex_long_double_type_node
;
11120 type
= build_complex_type (type
);
11123 /* If we're using the injected-class-name to form a compound type or a
11124 declaration, replace it with the underlying class so we don't get
11125 redundant typedefs in the debug output. But if we are returning the
11126 type unchanged, leave it alone so that it's available to
11127 maybe_get_template_decl_from_type_decl. */
11128 if (CLASS_TYPE_P (type
)
11129 && DECL_SELF_REFERENCE_P (TYPE_NAME (type
))
11130 && type
== TREE_TYPE (TYPE_NAME (type
))
11131 && (declarator
|| type_quals
))
11132 type
= DECL_ORIGINAL_TYPE (TYPE_NAME (type
));
11134 type_quals
|= cp_type_quals (type
);
11135 type
= cp_build_qualified_type_real
11136 (type
, type_quals
, ((((typedef_decl
&& !DECL_ARTIFICIAL (typedef_decl
))
11137 || declspecs
->decltype_p
)
11138 ? tf_ignore_bad_quals
: 0) | tf_warning_or_error
));
11139 /* We might have ignored or rejected some of the qualifiers. */
11140 type_quals
= cp_type_quals (type
);
11142 if (cxx_dialect
>= cxx17
&& type
&& is_auto (type
)
11143 && innermost_code
!= cdk_function
11144 && id_declarator
&& declarator
!= id_declarator
)
11145 if (tree tmpl
= CLASS_PLACEHOLDER_TEMPLATE (type
))
11147 error_at (typespec_loc
, "template placeholder type %qT must be followed "
11148 "by a simple declarator-id", type
);
11149 inform (DECL_SOURCE_LOCATION (tmpl
), "%qD declared here", tmpl
);
11150 type
= error_mark_node
;
11154 inlinep
= decl_spec_seq_has_spec_p (declspecs
, ds_inline
);
11155 virtualp
= decl_spec_seq_has_spec_p (declspecs
, ds_virtual
);
11156 explicitp
= decl_spec_seq_has_spec_p (declspecs
, ds_explicit
);
11158 storage_class
= declspecs
->storage_class
;
11159 if (storage_class
== sc_static
)
11160 staticp
= 1 + (decl_context
== FIELD
);
11166 gcc_rich_location
richloc (declspecs
->locations
[ds_virtual
]);
11167 richloc
.add_range (declspecs
->locations
[ds_storage_class
]);
11168 error_at (&richloc
, "member %qD cannot be declared both %<virtual%> "
11169 "and %<static%>", dname
);
11170 storage_class
= sc_none
;
11173 if (constexpr_p
&& cxx_dialect
< cxx2a
)
11175 gcc_rich_location
richloc (declspecs
->locations
[ds_virtual
]);
11176 richloc
.add_range (declspecs
->locations
[ds_constexpr
]);
11177 pedwarn (&richloc
, OPT_Wpedantic
, "member %qD can be declared both "
11178 "%<virtual%> and %<constexpr%> only in %<-std=c++2a%> or "
11179 "%<-std=gnu++2a%>", dname
);
11182 friendp
= decl_spec_seq_has_spec_p (declspecs
, ds_friend
);
11184 /* Issue errors about use of storage classes for parameters. */
11185 if (decl_context
== PARM
)
11189 error_at (declspecs
->locations
[ds_typedef
],
11190 "typedef declaration invalid in parameter declaration");
11191 return error_mark_node
;
11193 else if (template_parm_flag
&& storage_class
!= sc_none
)
11195 error_at (min_location (declspecs
->locations
[ds_thread
],
11196 declspecs
->locations
[ds_storage_class
]),
11197 "storage class specified for template parameter %qs",
11199 return error_mark_node
;
11201 else if (storage_class
== sc_static
11202 || storage_class
== sc_extern
11205 error_at (min_location (declspecs
->locations
[ds_thread
],
11206 declspecs
->locations
[ds_storage_class
]),
11207 "storage class specified for parameter %qs", name
);
11208 return error_mark_node
;
11211 /* Function parameters cannot be concept. */
11213 error_at (declspecs
->locations
[ds_concept
],
11214 "a parameter cannot be declared %<concept%>");
11215 /* Function parameters cannot be constexpr. If we saw one, moan
11216 and pretend it wasn't there. */
11217 else if (constexpr_p
)
11219 error_at (declspecs
->locations
[ds_constexpr
],
11220 "a parameter cannot be declared %<constexpr%>");
11223 else if (constinit_p
)
11225 error_at (declspecs
->locations
[ds_constinit
],
11226 "a parameter cannot be declared %<constinit%>");
11231 /* Give error if `virtual' is used outside of class declaration. */
11233 && (current_class_name
== NULL_TREE
|| decl_context
!= FIELD
))
11235 error_at (declspecs
->locations
[ds_virtual
],
11236 "%<virtual%> outside class declaration");
11240 if (innermost_code
== cdk_decomp
)
11242 location_t loc
= (declarator
->kind
== cdk_reference
11243 ? declarator
->declarator
->id_loc
: declarator
->id_loc
);
11245 error_at (declspecs
->locations
[ds_inline
],
11246 "structured binding declaration cannot be %qs", "inline");
11248 error_at (declspecs
->locations
[ds_typedef
],
11249 "structured binding declaration cannot be %qs", "typedef");
11251 error_at (declspecs
->locations
[ds_constexpr
], "structured "
11252 "binding declaration cannot be %qs", "constexpr");
11253 if (thread_p
&& cxx_dialect
< cxx2a
)
11254 pedwarn (declspecs
->locations
[ds_thread
], 0,
11255 "structured binding declaration can be %qs only in "
11256 "%<-std=c++2a%> or %<-std=gnu++2a%>",
11257 declspecs
->gnu_thread_keyword_p
11258 ? "__thread" : "thread_local");
11260 error_at (declspecs
->locations
[ds_concept
],
11261 "structured binding declaration cannot be %qs", "concept");
11262 /* [dcl.struct.bind] "A cv that includes volatile is deprecated." */
11263 if (type_quals
& TYPE_QUAL_VOLATILE
)
11264 warning_at (declspecs
->locations
[ds_volatile
], OPT_Wvolatile
,
11265 "%<volatile%>-qualified structured binding is deprecated");
11266 switch (storage_class
)
11271 error_at (loc
, "structured binding declaration cannot be %qs",
11275 if (cxx_dialect
< cxx2a
)
11277 "structured binding declaration can be %qs only in "
11278 "%<-std=c++2a%> or %<-std=gnu++2a%>", "static");
11281 error_at (loc
, "structured binding declaration cannot be %qs",
11285 error_at (loc
, "structured binding declaration cannot be %qs",
11289 error_at (loc
, "structured binding declaration cannot be "
11293 gcc_unreachable ();
11295 if (TREE_CODE (type
) != TEMPLATE_TYPE_PARM
11296 || TYPE_IDENTIFIER (type
) != auto_identifier
)
11298 if (type
!= error_mark_node
)
11300 error_at (loc
, "structured binding declaration cannot have "
11303 "type must be cv-qualified %<auto%> or reference to "
11304 "cv-qualified %<auto%>");
11306 type
= build_qualified_type (make_auto (), type_quals
);
11307 declspecs
->type
= type
;
11313 if (storage_class
!= sc_static
)
11315 storage_class
= sc_none
;
11316 declspecs
->storage_class
= sc_none
;
11320 /* Static anonymous unions are dealt with here. */
11321 if (staticp
&& decl_context
== TYPENAME
11323 && ANON_AGGR_TYPE_P (declspecs
->type
))
11324 decl_context
= FIELD
;
11326 /* Warn about storage classes that are invalid for certain
11327 kinds of declarations (parameters, typenames, etc.). */
11330 && storage_class
!= sc_extern
11331 && storage_class
!= sc_static
)
11335 = min_location (declspecs
->locations
[ds_thread
],
11336 declspecs
->locations
[ds_storage_class
]);
11337 error_at (loc
, "multiple storage classes in declaration of %qs", name
);
11340 if (decl_context
!= NORMAL
11341 && ((storage_class
!= sc_none
11342 && storage_class
!= sc_mutable
)
11345 if ((decl_context
== PARM
|| decl_context
== CATCHPARM
)
11346 && (storage_class
== sc_register
11347 || storage_class
== sc_auto
))
11349 else if (typedef_p
)
11351 else if (decl_context
== FIELD
11352 /* C++ allows static class elements. */
11353 && storage_class
== sc_static
)
11354 /* C++ also allows inlines and signed and unsigned elements,
11355 but in those cases we don't come in here. */
11360 = min_location (declspecs
->locations
[ds_thread
],
11361 declspecs
->locations
[ds_storage_class
]);
11362 if (decl_context
== FIELD
)
11363 error_at (loc
, "storage class specified for %qs", name
);
11364 else if (decl_context
== PARM
|| decl_context
== CATCHPARM
)
11365 error_at (loc
, "storage class specified for parameter %qs", name
);
11367 error_at (loc
, "storage class specified for typename");
11368 if (storage_class
== sc_register
11369 || storage_class
== sc_auto
11370 || storage_class
== sc_extern
11372 storage_class
= sc_none
;
11375 else if (storage_class
== sc_extern
&& funcdef_flag
11376 && ! toplevel_bindings_p ())
11377 error ("nested function %qs declared %<extern%>", name
);
11378 else if (toplevel_bindings_p ())
11380 if (storage_class
== sc_auto
)
11381 error_at (declspecs
->locations
[ds_storage_class
],
11382 "top-level declaration of %qs specifies %<auto%>", name
);
11385 && storage_class
!= sc_extern
11386 && storage_class
!= sc_static
)
11388 if (declspecs
->gnu_thread_keyword_p
)
11389 pedwarn (declspecs
->locations
[ds_thread
],
11390 0, "function-scope %qs implicitly auto and "
11391 "declared %<__thread%>", name
);
11393 /* When thread_local is applied to a variable of block scope the
11394 storage-class-specifier static is implied if it does not appear
11396 storage_class
= declspecs
->storage_class
= sc_static
;
11400 if (storage_class
&& friendp
)
11402 error_at (min_location (declspecs
->locations
[ds_thread
],
11403 declspecs
->locations
[ds_storage_class
]),
11404 "storage class specifiers invalid in friend function "
11406 storage_class
= sc_none
;
11410 if (!id_declarator
)
11411 unqualified_id
= NULL_TREE
;
11414 unqualified_id
= id_declarator
->u
.id
.unqualified_name
;
11415 switch (TREE_CODE (unqualified_id
))
11418 unqualified_id
= TREE_OPERAND (unqualified_id
, 0);
11419 if (TYPE_P (unqualified_id
))
11420 unqualified_id
= constructor_name (unqualified_id
);
11423 case IDENTIFIER_NODE
:
11424 case TEMPLATE_ID_EXPR
:
11428 gcc_unreachable ();
11432 if (declspecs
->std_attributes
)
11434 location_t attr_loc
= declspecs
->locations
[ds_std_attribute
];
11435 if (warning_at (attr_loc
, OPT_Wattributes
, "attribute ignored"))
11436 inform (attr_loc
, "an attribute that appertains to a type-specifier "
11440 /* Determine the type of the entity declared by recurring on the
11442 for (; declarator
; declarator
= declarator
->declarator
)
11444 const cp_declarator
*inner_declarator
;
11447 if (type
== error_mark_node
)
11448 return error_mark_node
;
11450 attrs
= declarator
->attributes
;
11456 if (declarator
== NULL
|| declarator
->kind
== cdk_id
)
11457 attr_flags
|= (int) ATTR_FLAG_DECL_NEXT
;
11458 if (declarator
->kind
== cdk_function
)
11459 attr_flags
|= (int) ATTR_FLAG_FUNCTION_NEXT
;
11460 if (declarator
->kind
== cdk_array
)
11461 attr_flags
|= (int) ATTR_FLAG_ARRAY_NEXT
;
11462 returned_attrs
= decl_attributes (&type
,
11463 chainon (returned_attrs
, attrs
),
11467 inner_declarator
= declarator
->declarator
;
11469 /* We don't want to warn in parameter context because we don't
11470 yet know if the parse will succeed, and this might turn out
11471 to be a constructor call. */
11472 if (decl_context
!= PARM
11473 && decl_context
!= TYPENAME
11475 && declarator
->parenthesized
!= UNKNOWN_LOCATION
11476 /* If the type is class-like and the inner name used a
11477 global namespace qualifier, we need the parens.
11478 Unfortunately all we can tell is whether a qualified name
11479 was used or not. */
11480 && !(inner_declarator
11481 && inner_declarator
->kind
== cdk_id
11482 && inner_declarator
->u
.id
.qualifying_scope
11483 && (MAYBE_CLASS_TYPE_P (type
)
11484 || TREE_CODE (type
) == ENUMERAL_TYPE
)))
11485 warning_at (declarator
->parenthesized
, OPT_Wparentheses
,
11486 "unnecessary parentheses in declaration of %qs", name
);
11487 if (declarator
->kind
== cdk_id
|| declarator
->kind
== cdk_decomp
)
11490 switch (declarator
->kind
)
11493 type
= create_array_type_for_decl (dname
, type
,
11494 declarator
->u
.array
.bounds
,
11495 declarator
->id_loc
);
11496 if (!valid_array_size_p (dname
11497 ? declarator
->id_loc
: input_location
,
11499 type
= error_mark_node
;
11501 if (declarator
->std_attributes
)
11504 The optional attribute-specifier-seq appertains to the
11506 returned_attrs
= chainon (returned_attrs
,
11507 declarator
->std_attributes
);
11515 /* Declaring a function type. */
11517 input_location
= declspecs
->locations
[ds_type_spec
];
11518 abstract_virtuals_error (ACU_RETURN
, type
);
11519 input_location
= saved_loc
;
11521 /* Pick up type qualifiers which should be applied to `this'. */
11522 memfn_quals
= declarator
->u
.function
.qualifiers
;
11523 /* Pick up virt-specifiers. */
11524 virt_specifiers
= declarator
->u
.function
.virt_specifiers
;
11525 /* And ref-qualifier, too */
11526 rqual
= declarator
->u
.function
.ref_qualifier
;
11527 /* And tx-qualifier. */
11528 tree tx_qual
= declarator
->u
.function
.tx_qualifier
;
11529 /* Pick up the exception specifications. */
11530 raises
= declarator
->u
.function
.exception_specification
;
11531 /* If the exception-specification is ill-formed, let's pretend
11532 there wasn't one. */
11533 if (raises
== error_mark_node
)
11534 raises
= NULL_TREE
;
11537 error_at (location_of (reqs
), "requires-clause on return type");
11538 reqs
= declarator
->u
.function
.requires_clause
;
11540 /* Say it's a definition only for the CALL_EXPR
11541 closest to the identifier. */
11542 funcdecl_p
= inner_declarator
&& inner_declarator
->kind
== cdk_id
;
11544 /* Handle a late-specified return type. */
11545 tree late_return_type
= declarator
->u
.function
.late_return_type
;
11547 /* This is the case e.g. for
11548 using T = auto () -> int. */
11549 || inner_declarator
== NULL
)
11551 if (tree auto_node
= type_uses_auto (type
))
11553 if (!late_return_type
)
11555 if (current_class_type
11556 && LAMBDA_TYPE_P (current_class_type
))
11557 /* OK for C++11 lambdas. */;
11558 else if (cxx_dialect
< cxx14
)
11560 error_at (typespec_loc
, "%qs function uses "
11561 "%<auto%> type specifier without "
11562 "trailing return type", name
);
11563 inform (typespec_loc
,
11564 "deduced return type only available "
11565 "with %<-std=c++14%> or %<-std=gnu++14%>");
11569 error_at (typespec_loc
, "virtual function "
11570 "cannot have deduced return type");
11574 else if (!is_auto (type
) && sfk
!= sfk_conversion
)
11576 error_at (typespec_loc
, "%qs function with trailing "
11577 "return type has %qT as its type rather "
11578 "than plain %<auto%>", name
, type
);
11579 return error_mark_node
;
11581 else if (is_auto (type
) && AUTO_IS_DECLTYPE (type
))
11584 error_at (typespec_loc
,
11585 "%qs function with trailing return type "
11586 "has %<decltype(auto)%> as its type "
11587 "rather than plain %<auto%>", name
);
11589 error_at (typespec_loc
,
11590 "invalid use of %<decltype(auto)%>");
11591 return error_mark_node
;
11593 tree tmpl
= CLASS_PLACEHOLDER_TEMPLATE (auto_node
);
11595 if (tree late_auto
= type_uses_auto (late_return_type
))
11596 tmpl
= CLASS_PLACEHOLDER_TEMPLATE (late_auto
);
11597 if (tmpl
&& funcdecl_p
)
11599 if (!dguide_name_p (unqualified_id
))
11601 error_at (declarator
->id_loc
, "deduced class "
11602 "type %qD in function return type",
11604 inform (DECL_SOURCE_LOCATION (tmpl
),
11605 "%qD declared here", tmpl
);
11606 return error_mark_node
;
11608 else if (!late_return_type
)
11610 error_at (declarator
->id_loc
, "deduction guide "
11611 "for %qT must have trailing return "
11612 "type", TREE_TYPE (tmpl
));
11613 inform (DECL_SOURCE_LOCATION (tmpl
),
11614 "%qD declared here", tmpl
);
11615 return error_mark_node
;
11617 else if (CLASS_TYPE_P (late_return_type
)
11618 && CLASSTYPE_TEMPLATE_INFO (late_return_type
)
11619 && (CLASSTYPE_TI_TEMPLATE (late_return_type
)
11623 error ("trailing return type %qT of deduction guide "
11624 "is not a specialization of %qT",
11625 late_return_type
, TREE_TYPE (tmpl
));
11628 else if (late_return_type
11629 && sfk
!= sfk_conversion
)
11631 if (late_return_type
== error_mark_node
)
11632 return error_mark_node
;
11633 if (cxx_dialect
< cxx11
)
11634 /* Not using maybe_warn_cpp0x because this should
11635 always be an error. */
11636 error_at (typespec_loc
,
11637 "trailing return type only available "
11638 "with %<-std=c++11%> or %<-std=gnu++11%>");
11640 error_at (typespec_loc
, "%qs function with trailing "
11641 "return type not declared with %<auto%> "
11642 "type specifier", name
);
11643 return error_mark_node
;
11646 type
= splice_late_return_type (type
, late_return_type
);
11647 if (type
== error_mark_node
)
11648 return error_mark_node
;
11650 if (late_return_type
)
11652 late_return_type_p
= true;
11653 type_quals
= cp_type_quals (type
);
11656 if (type_quals
!= TYPE_UNQUALIFIED
)
11658 if (SCALAR_TYPE_P (type
) || VOID_TYPE_P (type
))
11659 warning_at (typespec_loc
, OPT_Wignored_qualifiers
, "type "
11660 "qualifiers ignored on function return type");
11661 /* [dcl.fct] "A volatile-qualified return type is
11663 if (type_quals
& TYPE_QUAL_VOLATILE
)
11664 warning_at (typespec_loc
, OPT_Wvolatile
,
11665 "%<volatile%>-qualified return type is "
11668 /* We now know that the TYPE_QUALS don't apply to the
11669 decl, but to its return type. */
11670 type_quals
= TYPE_UNQUALIFIED
;
11673 /* Error about some types functions can't return. */
11675 if (TREE_CODE (type
) == FUNCTION_TYPE
)
11677 error_at (typespec_loc
, "%qs declared as function returning "
11678 "a function", name
);
11679 return error_mark_node
;
11681 if (TREE_CODE (type
) == ARRAY_TYPE
)
11683 error_at (typespec_loc
, "%qs declared as function returning "
11685 return error_mark_node
;
11689 error_at (declspecs
->locations
[ds_constinit
],
11690 "%<constinit%> on function return type is not "
11692 return error_mark_node
;
11694 /* Only plain decltype(auto) is allowed. */
11695 if (tree a
= type_uses_auto (type
))
11697 if (AUTO_IS_DECLTYPE (a
) && a
!= type
)
11699 error_at (typespec_loc
, "%qT as type rather than "
11700 "plain %<decltype(auto)%>", type
);
11701 return error_mark_node
;
11705 if (ctype
== NULL_TREE
11706 && decl_context
== FIELD
11709 ctype
= current_class_type
;
11711 if (ctype
&& (sfk
== sfk_constructor
11712 || sfk
== sfk_destructor
))
11714 /* We are within a class's scope. If our declarator name
11715 is the same as the class name, and we are defining
11716 a function, then it is a constructor/destructor, and
11717 therefore returns a void type. */
11719 /* ISO C++ 12.4/2. A destructor may not be declared
11720 const or volatile. A destructor may not be static.
11721 A destructor may not be declared with ref-qualifier.
11723 ISO C++ 12.1. A constructor may not be declared
11724 const or volatile. A constructor may not be
11725 virtual. A constructor may not be static.
11726 A constructor may not be declared with ref-qualifier. */
11728 error_at (declspecs
->locations
[ds_storage_class
],
11729 (flags
== DTOR_FLAG
)
11730 ? G_("destructor cannot be static member "
11732 : G_("constructor cannot be static member "
11736 error ((flags
== DTOR_FLAG
)
11737 ? G_("destructors may not be cv-qualified")
11738 : G_("constructors may not be cv-qualified"));
11739 memfn_quals
= TYPE_UNQUALIFIED
;
11744 maybe_warn_cpp0x (CPP0X_REF_QUALIFIER
);
11745 error ((flags
== DTOR_FLAG
)
11746 ? G_("destructors may not be ref-qualified")
11747 : G_("constructors may not be ref-qualified"));
11748 rqual
= REF_QUAL_NONE
;
11751 if (decl_context
== FIELD
11752 && !member_function_or_else (ctype
,
11753 current_class_type
,
11755 return error_mark_node
;
11757 if (flags
!= DTOR_FLAG
)
11759 /* It's a constructor. */
11760 if (explicitp
== 1)
11764 permerror (declspecs
->locations
[ds_virtual
],
11765 "constructors cannot be declared %<virtual%>");
11768 if (decl_context
== FIELD
11769 && sfk
!= sfk_constructor
)
11770 return error_mark_node
;
11772 if (decl_context
== FIELD
)
11779 /* Cannot be both friend and virtual. */
11780 gcc_rich_location
richloc (declspecs
->locations
[ds_virtual
]);
11781 richloc
.add_range (declspecs
->locations
[ds_friend
]);
11782 error_at (&richloc
, "virtual functions cannot be friends");
11785 if (decl_context
== NORMAL
)
11786 error_at (declarator
->id_loc
,
11787 "friend declaration not in class definition");
11788 if (current_function_decl
&& funcdef_flag
)
11790 error_at (declarator
->id_loc
,
11791 "cannot define friend function %qs in a local "
11792 "class definition", name
);
11795 /* [class.friend]/6: A function can be defined in a friend
11796 declaration if the function name is unqualified. */
11797 if (funcdef_flag
&& in_namespace
)
11799 if (in_namespace
== global_namespace
)
11800 error_at (declarator
->id_loc
,
11801 "friend function definition %qs cannot have "
11802 "a name qualified with %<::%>", name
);
11804 error_at (declarator
->id_loc
,
11805 "friend function definition %qs cannot have "
11806 "a name qualified with %<%D::%>", name
,
11810 else if (ctype
&& sfk
== sfk_conversion
)
11812 if (explicitp
== 1)
11814 maybe_warn_cpp0x (CPP0X_EXPLICIT_CONVERSION
);
11817 if (late_return_type_p
)
11818 error ("a conversion function cannot have a trailing return type");
11820 else if (sfk
== sfk_deduction_guide
)
11822 if (explicitp
== 1)
11826 tree pushed_scope
= NULL_TREE
;
11828 && decl_context
!= FIELD
11829 && inner_declarator
->u
.id
.qualifying_scope
11830 && CLASS_TYPE_P (inner_declarator
->u
.id
.qualifying_scope
))
11832 = push_scope (inner_declarator
->u
.id
.qualifying_scope
);
11834 arg_types
= grokparms (declarator
->u
.function
.parameters
, &parms
);
11837 pop_scope (pushed_scope
);
11839 if (inner_declarator
11840 && inner_declarator
->kind
== cdk_id
11841 && inner_declarator
->u
.id
.sfk
== sfk_destructor
11842 && arg_types
!= void_list_node
)
11844 error_at (declarator
->id_loc
,
11845 "destructors may not have parameters");
11846 arg_types
= void_list_node
;
11850 type
= build_function_type (type
, arg_types
);
11852 tree attrs
= declarator
->std_attributes
;
11855 tree att
= build_tree_list (tx_qual
, NULL_TREE
);
11856 /* transaction_safe applies to the type, but
11857 transaction_safe_dynamic applies to the function. */
11858 if (is_attribute_p ("transaction_safe", tx_qual
))
11859 attrs
= chainon (attrs
, att
);
11861 returned_attrs
= chainon (returned_attrs
, att
);
11866 The optional attribute-specifier-seq appertains to
11867 the function type. */
11868 decl_attributes (&type
, attrs
, 0);
11871 type
= build_exception_variant (type
, raises
);
11876 case cdk_reference
:
11878 /* Filter out pointers-to-references and references-to-references.
11879 We can get these if a TYPE_DECL is used. */
11881 if (TYPE_REF_P (type
))
11883 if (declarator
->kind
!= cdk_reference
)
11885 error ("cannot declare pointer to %q#T", type
);
11886 type
= TREE_TYPE (type
);
11889 /* In C++0x, we allow reference to reference declarations
11890 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
11891 and template type arguments [14.3.1/4 temp.arg.type]. The
11892 check for direct reference to reference declarations, which
11893 are still forbidden, occurs below. Reasoning behind the change
11894 can be found in DR106, DR540, and the rvalue reference
11896 else if (cxx_dialect
== cxx98
)
11898 error ("cannot declare reference to %q#T", type
);
11899 type
= TREE_TYPE (type
);
11902 else if (VOID_TYPE_P (type
))
11904 if (declarator
->kind
== cdk_reference
)
11905 error ("cannot declare reference to %q#T", type
);
11906 else if (declarator
->kind
== cdk_ptrmem
)
11907 error ("cannot declare pointer to %q#T member", type
);
11910 /* We now know that the TYPE_QUALS don't apply to the decl,
11911 but to the target of the pointer. */
11912 type_quals
= TYPE_UNQUALIFIED
;
11914 /* This code used to handle METHOD_TYPE, but I don't think it's
11915 possible to get it here anymore. */
11916 gcc_assert (TREE_CODE (type
) != METHOD_TYPE
);
11917 if (declarator
->kind
== cdk_ptrmem
11918 && TREE_CODE (type
) == FUNCTION_TYPE
)
11920 memfn_quals
|= type_memfn_quals (type
);
11921 type
= build_memfn_type (type
,
11922 declarator
->u
.pointer
.class_type
,
11925 if (type
== error_mark_node
)
11926 return error_mark_node
;
11928 rqual
= REF_QUAL_NONE
;
11929 memfn_quals
= TYPE_UNQUALIFIED
;
11932 if (TREE_CODE (type
) == FUNCTION_TYPE
11933 && (type_memfn_quals (type
) != TYPE_UNQUALIFIED
11934 || type_memfn_rqual (type
) != REF_QUAL_NONE
))
11935 error (declarator
->kind
== cdk_reference
11936 ? G_("cannot declare reference to qualified function type %qT")
11937 : G_("cannot declare pointer to qualified function type %qT"),
11940 /* When the pointed-to type involves components of variable size,
11941 care must be taken to ensure that the size evaluation code is
11942 emitted early enough to dominate all the possible later uses
11943 and late enough for the variables on which it depends to have
11946 This is expected to happen automatically when the pointed-to
11947 type has a name/declaration of it's own, but special attention
11948 is required if the type is anonymous.
11950 We handle the NORMAL and FIELD contexts here by inserting a
11951 dummy statement that just evaluates the size at a safe point
11952 and ensures it is not deferred until e.g. within a deeper
11953 conditional context (c++/43555).
11955 We expect nothing to be needed here for PARM or TYPENAME.
11956 Evaluating the size at this point for TYPENAME would
11957 actually be incorrect, as we might be in the middle of an
11958 expression with side effects on the pointed-to type size
11959 "arguments" prior to the pointer declaration point and the
11960 size evaluation could end up prior to the side effects. */
11962 if (!TYPE_NAME (type
)
11963 && (decl_context
== NORMAL
|| decl_context
== FIELD
)
11964 && at_function_scope_p ()
11965 && variably_modified_type_p (type
, NULL_TREE
))
11967 TYPE_NAME (type
) = build_decl (UNKNOWN_LOCATION
, TYPE_DECL
,
11969 add_decl_expr (TYPE_NAME (type
));
11972 if (declarator
->kind
== cdk_reference
)
11974 /* In C++0x, the type we are creating a reference to might be
11975 a typedef which is itself a reference type. In that case,
11976 we follow the reference collapsing rules in
11977 [7.1.3/8 dcl.typedef] to create the final reference type:
11979 "If a typedef TD names a type that is a reference to a type
11980 T, an attempt to create the type 'lvalue reference to cv TD'
11981 creates the type 'lvalue reference to T,' while an attempt
11982 to create the type "rvalue reference to cv TD' creates the
11985 if (VOID_TYPE_P (type
))
11986 /* We already gave an error. */;
11987 else if (TYPE_REF_P (type
))
11989 if (declarator
->u
.reference
.rvalue_ref
)
11990 /* Leave type alone. */;
11992 type
= cp_build_reference_type (TREE_TYPE (type
), false);
11995 type
= cp_build_reference_type
11996 (type
, declarator
->u
.reference
.rvalue_ref
);
11998 /* In C++0x, we need this check for direct reference to
11999 reference declarations, which are forbidden by
12000 [8.3.2/5 dcl.ref]. Reference to reference declarations
12001 are only allowed indirectly through typedefs and template
12002 type arguments. Example:
12004 void foo(int & &); // invalid ref-to-ref decl
12006 typedef int & int_ref;
12007 void foo(int_ref &); // valid ref-to-ref decl
12009 if (inner_declarator
&& inner_declarator
->kind
== cdk_reference
)
12010 error ("cannot declare reference to %q#T, which is not "
12011 "a typedef or a template type argument", type
);
12013 else if (TREE_CODE (type
) == METHOD_TYPE
)
12014 type
= build_ptrmemfunc_type (build_pointer_type (type
));
12015 else if (declarator
->kind
== cdk_ptrmem
)
12017 gcc_assert (TREE_CODE (declarator
->u
.pointer
.class_type
)
12018 != NAMESPACE_DECL
);
12019 if (declarator
->u
.pointer
.class_type
== error_mark_node
)
12020 /* We will already have complained. */
12021 type
= error_mark_node
;
12023 type
= build_ptrmem_type (declarator
->u
.pointer
.class_type
,
12027 type
= build_pointer_type (type
);
12029 /* Process a list of type modifier keywords (such as
12030 const or volatile) that were given inside the `*' or `&'. */
12032 if (declarator
->u
.pointer
.qualifiers
)
12035 = cp_build_qualified_type (type
,
12036 declarator
->u
.pointer
.qualifiers
);
12037 type_quals
= cp_type_quals (type
);
12040 /* Apply C++11 attributes to the pointer, and not to the
12041 type pointed to. This is unlike what is done for GNU
12042 attributes above. It is to comply with [dcl.ptr]/1:
12044 [the optional attribute-specifier-seq (7.6.1) appertains
12045 to the pointer and not to the object pointed to]. */
12046 if (declarator
->std_attributes
)
12047 decl_attributes (&type
, declarator
->std_attributes
,
12057 gcc_unreachable ();
12061 id_loc
= declarator
? declarator
->id_loc
: input_location
;
12063 /* A `constexpr' specifier used in an object declaration declares
12064 the object as `const'. */
12065 if (constexpr_p
&& innermost_code
!= cdk_function
)
12067 /* DR1688 says that a `constexpr' specifier in combination with
12068 `volatile' is valid. */
12070 if (!TYPE_REF_P (type
))
12072 type_quals
|= TYPE_QUAL_CONST
;
12073 type
= cp_build_qualified_type (type
, type_quals
);
12077 if (unqualified_id
&& TREE_CODE (unqualified_id
) == TEMPLATE_ID_EXPR
12078 && !FUNC_OR_METHOD_TYPE_P (type
)
12079 && !variable_template_p (TREE_OPERAND (unqualified_id
, 0)))
12081 error ("template-id %qD used as a declarator",
12083 unqualified_id
= dname
;
12086 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
12087 qualified with a class-name, turn it into a METHOD_TYPE, unless
12088 we know that the function is static. We take advantage of this
12089 opportunity to do other processing that pertains to entities
12090 explicitly declared to be class members. Note that if DECLARATOR
12091 is non-NULL, we know it is a cdk_id declarator; otherwise, we
12092 would not have exited the loop above. */
12094 && declarator
->kind
== cdk_id
12095 && declarator
->u
.id
.qualifying_scope
12096 && MAYBE_CLASS_TYPE_P (declarator
->u
.id
.qualifying_scope
))
12098 ctype
= declarator
->u
.id
.qualifying_scope
;
12099 ctype
= TYPE_MAIN_VARIANT (ctype
);
12100 template_count
= num_template_headers_for_class (ctype
);
12102 if (ctype
== current_class_type
)
12106 permerror (declspecs
->locations
[ds_friend
],
12107 "member functions are implicitly "
12108 "friends of their class");
12112 permerror (id_loc
, "extra qualification %<%T::%> on member %qs",
12115 else if (/* If the qualifying type is already complete, then we
12116 can skip the following checks. */
12117 !COMPLETE_TYPE_P (ctype
)
12118 && (/* If the function is being defined, then
12119 qualifying type must certainly be complete. */
12121 /* A friend declaration of "T::f" is OK, even if
12122 "T" is a template parameter. But, if this
12123 function is not a friend, the qualifying type
12124 must be a class. */
12125 || (!friendp
&& !CLASS_TYPE_P (ctype
))
12126 /* For a declaration, the type need not be
12127 complete, if either it is dependent (since there
12128 is no meaningful definition of complete in that
12129 case) or the qualifying class is currently being
12131 || !(dependent_type_p (ctype
)
12132 || currently_open_class (ctype
)))
12133 /* Check that the qualifying type is complete. */
12134 && !complete_type_or_else (ctype
, NULL_TREE
))
12135 return error_mark_node
;
12136 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
12138 if (current_class_type
12139 && (!friendp
|| funcdef_flag
|| initialized
))
12141 error_at (id_loc
, funcdef_flag
|| initialized
12142 ? G_("cannot define member function %<%T::%s%> "
12144 : G_("cannot declare member function %<%T::%s%> "
12146 ctype
, name
, current_class_type
);
12147 return error_mark_node
;
12150 else if (typedef_p
&& current_class_type
)
12152 error_at (id_loc
, "cannot declare member %<%T::%s%> within %qT",
12153 ctype
, name
, current_class_type
);
12154 return error_mark_node
;
12158 if (ctype
== NULL_TREE
&& decl_context
== FIELD
&& friendp
== 0)
12159 ctype
= current_class_type
;
12161 /* Now TYPE has the actual type. */
12163 if (returned_attrs
)
12166 *attrlist
= chainon (returned_attrs
, *attrlist
);
12168 attrlist
= &returned_attrs
;
12172 && declarator
->kind
== cdk_id
12173 && declarator
->std_attributes
12174 && attrlist
!= NULL
)
12176 /* [dcl.meaning]/1: The optional attribute-specifier-seq following
12177 a declarator-id appertains to the entity that is declared. */
12178 if (declarator
->std_attributes
!= error_mark_node
)
12179 *attrlist
= chainon (*attrlist
, declarator
->std_attributes
);
12181 /* We should have already diagnosed the issue (c++/78344). */
12182 gcc_assert (seen_error ());
12185 /* Handle parameter packs. */
12186 if (parameter_pack_p
)
12188 if (decl_context
== PARM
)
12189 /* Turn the type into a pack expansion.*/
12190 type
= make_pack_expansion (type
);
12192 error ("non-parameter %qs cannot be a parameter pack", name
);
12195 if ((decl_context
== FIELD
|| decl_context
== PARM
)
12196 && !processing_template_decl
12197 && variably_modified_type_p (type
, NULL_TREE
))
12199 if (decl_context
== FIELD
)
12201 "data member may not have variably modified type %qT", type
);
12204 "parameter may not have variably modified type %qT", type
);
12205 type
= error_mark_node
;
12208 if (explicitp
== 1 || (explicitp
&& friendp
))
12210 /* [dcl.fct.spec] (C++11) The explicit specifier shall be used only
12211 in the declaration of a constructor or conversion function within
12212 a class definition. */
12213 if (!current_class_type
)
12214 error_at (declspecs
->locations
[ds_explicit
],
12215 "%<explicit%> outside class declaration");
12217 error_at (declspecs
->locations
[ds_explicit
],
12218 "%<explicit%> in friend declaration");
12220 error_at (declspecs
->locations
[ds_explicit
],
12221 "only declarations of constructors and conversion operators "
12222 "can be %<explicit%>");
12226 if (storage_class
== sc_mutable
)
12228 location_t sloc
= declspecs
->locations
[ds_storage_class
];
12229 if (decl_context
!= FIELD
|| friendp
)
12231 error_at (sloc
, "non-member %qs cannot be declared %<mutable%>",
12233 storage_class
= sc_none
;
12235 else if (decl_context
== TYPENAME
|| typedef_p
)
12238 "non-object member %qs cannot be declared %<mutable%>",
12240 storage_class
= sc_none
;
12242 else if (FUNC_OR_METHOD_TYPE_P (type
))
12244 error_at (sloc
, "function %qs cannot be declared %<mutable%>",
12246 storage_class
= sc_none
;
12250 error_at (sloc
, "%<static%> %qs cannot be declared %<mutable%>",
12252 storage_class
= sc_none
;
12254 else if (type_quals
& TYPE_QUAL_CONST
)
12256 error_at (sloc
, "%<const%> %qs cannot be declared %<mutable%>",
12258 storage_class
= sc_none
;
12260 else if (TYPE_REF_P (type
))
12262 permerror (sloc
, "reference %qs cannot be declared %<mutable%>",
12264 storage_class
= sc_none
;
12268 /* If this is declaring a typedef name, return a TYPE_DECL. */
12269 if (typedef_p
&& decl_context
!= TYPENAME
)
12271 bool alias_p
= decl_spec_seq_has_spec_p (declspecs
, ds_alias
);
12276 if (decl_context
== NORMAL
)
12278 "typedef may not be a function definition");
12281 "typedef may not be a member function definition");
12282 return error_mark_node
;
12285 /* This declaration:
12287 typedef void f(int) const;
12289 declares a function type which is not a member of any
12290 particular class, but which is cv-qualified; for
12291 example "f S::*" declares a pointer to a const-qualified
12292 member function of S. We record the cv-qualification in the
12294 if ((rqual
|| memfn_quals
) && TREE_CODE (type
) == FUNCTION_TYPE
)
12296 type
= apply_memfn_quals (type
, memfn_quals
, rqual
);
12298 /* We have now dealt with these qualifiers. */
12299 memfn_quals
= TYPE_UNQUALIFIED
;
12300 rqual
= REF_QUAL_NONE
;
12303 if (type_uses_auto (type
))
12306 error_at (declspecs
->locations
[ds_type_spec
],
12307 "%<auto%> not allowed in alias declaration");
12309 error_at (declspecs
->locations
[ds_type_spec
],
12310 "typedef declared %<auto%>");
12311 type
= error_mark_node
;
12315 error_at (location_of (reqs
), "requires-clause on typedef");
12317 if (id_declarator
&& declarator
->u
.id
.qualifying_scope
)
12319 error_at (id_loc
, "typedef name may not be a nested-name-specifier");
12320 type
= error_mark_node
;
12323 if (decl_context
== FIELD
)
12324 decl
= build_lang_decl_loc (id_loc
, TYPE_DECL
, unqualified_id
, type
);
12326 decl
= build_decl (id_loc
, TYPE_DECL
, unqualified_id
, type
);
12328 if (decl_context
!= FIELD
)
12330 if (!current_function_decl
)
12331 DECL_CONTEXT (decl
) = FROB_CONTEXT (current_namespace
);
12332 else if (DECL_MAYBE_IN_CHARGE_CDTOR_P (current_function_decl
))
12333 /* The TYPE_DECL is "abstract" because there will be
12334 clones of this constructor/destructor, and there will
12335 be copies of this TYPE_DECL generated in those
12336 clones. The decloning optimization (for space) may
12337 revert this subsequently if it determines that
12338 the clones should share a common implementation. */
12339 DECL_ABSTRACT_P (decl
) = true;
12341 else if (current_class_type
12342 && constructor_name_p (unqualified_id
, current_class_type
))
12343 permerror (id_loc
, "ISO C++ forbids nested type %qD with same name "
12344 "as enclosing class",
12347 /* If the user declares "typedef struct {...} foo" then the
12348 struct will have an anonymous name. Fill that name in now.
12349 Nothing can refer to it, so nothing needs know about the name
12351 if (type
!= error_mark_node
12353 && TYPE_NAME (type
)
12354 && TREE_CODE (TYPE_NAME (type
)) == TYPE_DECL
12355 && TYPE_UNNAMED_P (type
)
12356 && declspecs
->type_definition_p
12357 && attributes_naming_typedef_ok (*attrlist
)
12358 && cp_type_quals (type
) == TYPE_UNQUALIFIED
)
12359 name_unnamed_type (type
, decl
);
12362 || (typedef_decl
&& C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
)))
12363 C_TYPEDEF_EXPLICITLY_SIGNED (decl
) = 1;
12365 bad_specifiers (decl
, BSP_TYPE
, virtualp
,
12366 memfn_quals
!= TYPE_UNQUALIFIED
,
12367 inlinep
, friendp
, raises
!= NULL_TREE
,
12368 declspecs
->locations
);
12371 /* Acknowledge that this was written:
12372 `using analias = atype;'. */
12373 TYPE_DECL_ALIAS_P (decl
) = 1;
12378 /* Detect the case of an array type of unspecified size
12379 which came, as such, direct from a typedef name.
12380 We must copy the type, so that the array's domain can be
12381 individually set by the object's initializer. */
12383 if (type
&& typedef_type
12384 && TREE_CODE (type
) == ARRAY_TYPE
&& !TYPE_DOMAIN (type
)
12385 && TYPE_MAIN_VARIANT (type
) == TYPE_MAIN_VARIANT (typedef_type
))
12386 type
= build_cplus_array_type (TREE_TYPE (type
), NULL_TREE
);
12388 /* Detect where we're using a typedef of function type to declare a
12389 function. PARMS will not be set, so we must create it now. */
12391 if (type
== typedef_type
&& TREE_CODE (type
) == FUNCTION_TYPE
)
12393 tree decls
= NULL_TREE
;
12396 for (args
= TYPE_ARG_TYPES (type
);
12397 args
&& args
!= void_list_node
;
12398 args
= TREE_CHAIN (args
))
12400 tree decl
= cp_build_parm_decl (NULL_TREE
, NULL_TREE
,
12401 TREE_VALUE (args
));
12403 DECL_CHAIN (decl
) = decls
;
12407 parms
= nreverse (decls
);
12409 if (decl_context
!= TYPENAME
)
12411 /* The qualifiers on the function type become the qualifiers on
12412 the non-static member function. */
12413 memfn_quals
|= type_memfn_quals (type
);
12414 rqual
= type_memfn_rqual (type
);
12415 type_quals
= TYPE_UNQUALIFIED
;
12419 /* If this is a type name (such as, in a cast or sizeof),
12420 compute the type and return it now. */
12422 if (decl_context
== TYPENAME
)
12424 /* Note that here we don't care about type_quals. */
12426 /* Special case: "friend class foo" looks like a TYPENAME context. */
12431 error ("%<inline%> specified for friend class declaration");
12437 /* Don't allow friend declaration without a class-key. */
12438 if (TREE_CODE (type
) == TEMPLATE_TYPE_PARM
)
12439 permerror (input_location
, "template parameters cannot be friends");
12440 else if (TREE_CODE (type
) == TYPENAME_TYPE
)
12441 permerror (input_location
, "friend declaration requires class-key, "
12442 "i.e. %<friend class %T::%D%>",
12443 TYPE_CONTEXT (type
), TYPENAME_TYPE_FULLNAME (type
));
12445 permerror (input_location
, "friend declaration requires class-key, "
12446 "i.e. %<friend %#T%>",
12450 /* Only try to do this stuff if we didn't already give up. */
12451 if (type
!= integer_type_node
)
12453 /* A friendly class? */
12454 if (current_class_type
)
12455 make_friend_class (current_class_type
, TYPE_MAIN_VARIANT (type
),
12456 /*complain=*/true);
12458 error ("trying to make class %qT a friend of global scope",
12461 type
= void_type_node
;
12464 else if (memfn_quals
|| rqual
)
12466 if (ctype
== NULL_TREE
12467 && TREE_CODE (type
) == METHOD_TYPE
)
12468 ctype
= TYPE_METHOD_BASETYPE (type
);
12471 type
= build_memfn_type (type
, ctype
, memfn_quals
, rqual
);
12472 /* Core issue #547: need to allow this in template type args.
12473 Allow it in general in C++11 for alias-declarations. */
12474 else if ((template_type_arg
|| cxx_dialect
>= cxx11
)
12475 && TREE_CODE (type
) == FUNCTION_TYPE
)
12476 type
= apply_memfn_quals (type
, memfn_quals
, rqual
);
12478 error ("invalid qualifiers on non-member function type");
12482 error_at (location_of (reqs
), "requires-clause on type-id");
12486 else if (unqualified_id
== NULL_TREE
&& decl_context
!= PARM
12487 && decl_context
!= CATCHPARM
12488 && TREE_CODE (type
) != UNION_TYPE
12490 && innermost_code
!= cdk_decomp
)
12492 error ("abstract declarator %qT used as declaration", type
);
12493 return error_mark_node
;
12496 if (!FUNC_OR_METHOD_TYPE_P (type
))
12498 /* Only functions may be declared using an operator-function-id. */
12499 if (dname
&& IDENTIFIER_ANY_OP_P (dname
))
12501 error_at (id_loc
, "declaration of %qD as non-function", dname
);
12502 return error_mark_node
;
12506 error_at (location_of (reqs
),
12507 "requires-clause on declaration of non-function type %qT",
12511 /* We don't check parameter types here because we can emit a better
12512 error message later. */
12513 if (decl_context
!= PARM
)
12515 type
= check_var_type (unqualified_id
, type
, id_loc
);
12516 if (type
== error_mark_node
)
12517 return error_mark_node
;
12520 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
12521 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
12523 if (decl_context
== PARM
|| decl_context
== CATCHPARM
)
12525 if (ctype
|| in_namespace
)
12526 error ("cannot use %<::%> in parameter declaration");
12528 if (type_uses_auto (type
)
12529 && !(cxx_dialect
>= cxx17
&& template_parm_flag
))
12531 if (cxx_dialect
>= cxx14
)
12532 error_at (typespec_loc
,
12533 "%<auto%> parameter not permitted in this context");
12535 error_at (typespec_loc
, "parameter declared %<auto%>");
12536 type
= error_mark_node
;
12539 /* A parameter declared as an array of T is really a pointer to T.
12540 One declared as a function is really a pointer to a function.
12541 One declared as a member is really a pointer to member. */
12543 if (TREE_CODE (type
) == ARRAY_TYPE
)
12545 /* Transfer const-ness of array into that of type pointed to. */
12546 type
= build_pointer_type (TREE_TYPE (type
));
12547 type_quals
= TYPE_UNQUALIFIED
;
12548 array_parameter_p
= true;
12550 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
12551 type
= build_pointer_type (type
);
12554 if (ctype
&& TREE_CODE (type
) == FUNCTION_TYPE
&& staticp
< 2
12555 && !(unqualified_id
12556 && identifier_p (unqualified_id
)
12557 && IDENTIFIER_NEWDEL_OP_P (unqualified_id
)))
12559 cp_cv_quals real_quals
= memfn_quals
;
12560 if (cxx_dialect
< cxx14
&& constexpr_p
12561 && sfk
!= sfk_constructor
&& sfk
!= sfk_destructor
)
12562 real_quals
|= TYPE_QUAL_CONST
;
12563 type
= build_memfn_type (type
, ctype
, real_quals
, rqual
);
12567 tree decl
= NULL_TREE
;
12569 if (decl_context
== PARM
)
12571 decl
= cp_build_parm_decl (NULL_TREE
, unqualified_id
, type
);
12572 DECL_ARRAY_PARAMETER_P (decl
) = array_parameter_p
;
12574 bad_specifiers (decl
, BSP_PARM
, virtualp
,
12575 memfn_quals
!= TYPE_UNQUALIFIED
,
12576 inlinep
, friendp
, raises
!= NULL_TREE
,
12577 declspecs
->locations
);
12579 else if (decl_context
== FIELD
)
12581 if (!staticp
&& !friendp
&& TREE_CODE (type
) != METHOD_TYPE
)
12582 if (tree auto_node
= type_uses_auto (type
))
12584 location_t tloc
= declspecs
->locations
[ds_type_spec
];
12585 if (CLASS_PLACEHOLDER_TEMPLATE (auto_node
))
12586 error_at (tloc
, "invalid use of template-name %qE without an "
12588 CLASS_PLACEHOLDER_TEMPLATE (auto_node
));
12590 error_at (tloc
, "non-static data member declared with "
12591 "placeholder %qT", auto_node
);
12592 type
= error_mark_node
;
12595 /* The C99 flexible array extension. */
12596 if (!staticp
&& TREE_CODE (type
) == ARRAY_TYPE
12597 && TYPE_DOMAIN (type
) == NULL_TREE
)
12600 && (TREE_CODE (ctype
) == UNION_TYPE
12601 || TREE_CODE (ctype
) == QUAL_UNION_TYPE
))
12603 error_at (id_loc
, "flexible array member in union");
12604 type
= error_mark_node
;
12608 /* Array is a flexible member. */
12609 if (in_system_header_at (input_location
))
12610 /* Do not warn on flexible array members in system
12611 headers because glibc uses them. */;
12613 pedwarn (id_loc
, OPT_Wpedantic
,
12614 "ISO C++ forbids flexible array member %qs", name
);
12616 pedwarn (input_location
, OPT_Wpedantic
,
12617 "ISO C++ forbids flexible array members");
12619 /* Flexible array member has a null domain. */
12620 type
= build_cplus_array_type (TREE_TYPE (type
), NULL_TREE
);
12624 if (type
== error_mark_node
)
12626 /* Happens when declaring arrays of sizes which
12627 are error_mark_node, for example. */
12630 else if (in_namespace
&& !friendp
)
12632 /* Something like struct S { int N::j; }; */
12633 error_at (id_loc
, "invalid use of %<::%>");
12634 return error_mark_node
;
12636 else if (FUNC_OR_METHOD_TYPE_P (type
) && unqualified_id
)
12639 tree function_context
;
12643 /* This should never happen in pure C++ (the check
12644 could be an assert). It could happen in
12645 Objective-C++ if someone writes invalid code that
12646 uses a function declaration for an instance
12647 variable or property (instance variables and
12648 properties are parsed as FIELD_DECLs, but they are
12649 part of an Objective-C class, not a C++ class).
12650 That code is invalid and is caught by this
12654 error ("declaration of function %qD in invalid context",
12656 return error_mark_node
;
12659 /* ``A union may [ ... ] not [ have ] virtual functions.''
12661 if (virtualp
&& TREE_CODE (ctype
) == UNION_TYPE
)
12663 error_at (declspecs
->locations
[ds_virtual
],
12664 "function %qD declared %<virtual%> inside a union",
12666 return error_mark_node
;
12670 && identifier_p (unqualified_id
)
12671 && IDENTIFIER_NEWDEL_OP_P (unqualified_id
))
12673 error_at (declspecs
->locations
[ds_virtual
],
12674 "%qD cannot be declared %<virtual%>, since it "
12675 "is always static", unqualified_id
);
12680 /* Check that the name used for a destructor makes sense. */
12681 if (sfk
== sfk_destructor
)
12683 tree uqname
= id_declarator
->u
.id
.unqualified_name
;
12687 gcc_assert (friendp
);
12688 error_at (id_loc
, "expected qualified name in friend "
12689 "declaration for destructor %qD", uqname
);
12690 return error_mark_node
;
12693 if (!check_dtor_name (ctype
, TREE_OPERAND (uqname
, 0)))
12695 error_at (id_loc
, "declaration of %qD as member of %qT",
12697 return error_mark_node
;
12701 error_at (declspecs
->locations
[ds_concept
],
12702 "a destructor cannot be %<concept%>");
12703 return error_mark_node
;
12707 error_at (declspecs
->locations
[ds_constexpr
],
12708 "a destructor cannot be %<constexpr%>");
12709 return error_mark_node
;
12712 else if (sfk
== sfk_constructor
&& friendp
&& !ctype
)
12714 error ("expected qualified name in friend declaration "
12715 "for constructor %qD",
12716 id_declarator
->u
.id
.unqualified_name
);
12717 return error_mark_node
;
12719 if (sfk
== sfk_constructor
)
12722 error_at (declspecs
->locations
[ds_concept
],
12723 "a constructor cannot be %<concept%>");
12724 return error_mark_node
;
12728 error_at (declspecs
->locations
[ds_concept
],
12729 "a concept cannot be a member function");
12733 if (TREE_CODE (unqualified_id
) == TEMPLATE_ID_EXPR
)
12735 tree tmpl
= TREE_OPERAND (unqualified_id
, 0);
12736 if (variable_template_p (tmpl
))
12738 error ("specialization of variable template %qD "
12739 "declared as function", tmpl
);
12740 inform (DECL_SOURCE_LOCATION (tmpl
),
12741 "variable template declared here");
12742 return error_mark_node
;
12746 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
12747 function_context
= (ctype
!= NULL_TREE
) ?
12748 decl_function_context (TYPE_MAIN_DECL (ctype
)) : NULL_TREE
;
12749 publicp
= (! friendp
|| ! staticp
)
12750 && function_context
== NULL_TREE
;
12752 decl
= grokfndecl (ctype
, type
,
12753 TREE_CODE (unqualified_id
) != TEMPLATE_ID_EXPR
12754 ? unqualified_id
: dname
,
12759 virtualp
, flags
, memfn_quals
, rqual
, raises
,
12760 friendp
? -1 : 0, friendp
, publicp
,
12761 inlinep
| (2 * constexpr_p
) | (4 * concept_p
),
12762 initialized
== SD_DELETED
, sfk
,
12763 funcdef_flag
, late_return_type_p
,
12764 template_count
, in_namespace
,
12766 decl
= set_virt_specifiers (decl
, virt_specifiers
);
12767 if (decl
== NULL_TREE
)
12768 return error_mark_node
;
12770 /* This clobbers the attrs stored in `decl' from `attrlist'. */
12771 /* The decl and setting of decl_attr is also turned off. */
12772 decl
= build_decl_attribute_variant (decl
, decl_attr
);
12775 /* [class.conv.ctor]
12777 A constructor declared without the function-specifier
12778 explicit that can be called with a single parameter
12779 specifies a conversion from the type of its first
12780 parameter to the type of its class. Such a constructor
12781 is called a converting constructor. */
12782 if (explicitp
== 2)
12783 DECL_NONCONVERTING_P (decl
) = 1;
12785 if (declspecs
->explicit_specifier
)
12786 store_explicit_specifier (decl
, declspecs
->explicit_specifier
);
12788 else if (!staticp
&& !dependent_type_p (type
)
12789 && !COMPLETE_TYPE_P (complete_type (type
))
12790 && (!complete_or_array_type_p (type
)
12791 || initialized
== 0))
12793 if (TREE_CODE (type
) != ARRAY_TYPE
12794 || !COMPLETE_TYPE_P (TREE_TYPE (type
)))
12796 if (unqualified_id
)
12798 error_at (id_loc
, "field %qD has incomplete type %qT",
12799 unqualified_id
, type
);
12800 cxx_incomplete_type_inform (strip_array_types (type
));
12803 error ("name %qT has incomplete type", type
);
12805 type
= error_mark_node
;
12813 if (unqualified_id
)
12815 "%qE is neither function nor member function; "
12816 "cannot be declared friend", unqualified_id
);
12818 error ("unnamed field is neither function nor member "
12819 "function; cannot be declared friend");
12820 return error_mark_node
;
12827 /* Friends are treated specially. */
12828 if (ctype
== current_class_type
)
12829 ; /* We already issued a permerror. */
12830 else if (decl
&& DECL_NAME (decl
))
12832 if (template_class_depth (current_class_type
) == 0)
12834 decl
= check_explicit_specialization
12835 (unqualified_id
, decl
, template_count
,
12836 2 * funcdef_flag
+ 4);
12837 if (decl
== error_mark_node
)
12838 return error_mark_node
;
12841 decl
= do_friend (ctype
, unqualified_id
, decl
,
12847 return error_mark_node
;
12850 /* Structure field. It may not be a function, except for C++. */
12852 if (decl
== NULL_TREE
)
12856 /* C++ allows static class members. All other work
12857 for this is done by grokfield. */
12858 decl
= build_lang_decl_loc (id_loc
, VAR_DECL
,
12859 unqualified_id
, type
);
12860 set_linkage_for_static_data_member (decl
);
12862 error_at (declspecs
->locations
[ds_concept
],
12863 "static data member %qE declared %<concept%>",
12865 else if (constexpr_p
&& !initialized
)
12867 error_at (DECL_SOURCE_LOCATION (decl
),
12868 "%<constexpr%> static data member %qD must "
12869 "have an initializer", decl
);
12870 constexpr_p
= false;
12874 mark_inline_variable (decl
, declspecs
->locations
[ds_inline
]);
12876 if (!DECL_VAR_DECLARED_INLINE_P (decl
)
12877 && !(cxx_dialect
>= cxx17
&& constexpr_p
))
12878 /* Even if there is an in-class initialization, DECL
12879 is considered undefined until an out-of-class
12880 definition is provided, unless this is an inline
12882 DECL_EXTERNAL (decl
) = 1;
12886 CP_DECL_THREAD_LOCAL_P (decl
) = true;
12887 if (!processing_template_decl
)
12888 set_decl_tls_model (decl
, decl_default_tls_model (decl
));
12889 if (declspecs
->gnu_thread_keyword_p
)
12890 SET_DECL_GNU_TLS_P (decl
);
12896 error_at (declspecs
->locations
[ds_concept
],
12897 "non-static data member %qE declared %<concept%>",
12899 else if (constexpr_p
)
12901 error_at (declspecs
->locations
[ds_constexpr
],
12902 "non-static data member %qE declared "
12903 "%<constexpr%>", unqualified_id
);
12904 constexpr_p
= false;
12906 else if (constinit_p
)
12908 error_at (declspecs
->locations
[ds_constinit
],
12909 "non-static data member %qE declared "
12910 "%<constinit%>", unqualified_id
);
12911 constinit_p
= false;
12913 decl
= build_decl (id_loc
, FIELD_DECL
, unqualified_id
, type
);
12914 DECL_NONADDRESSABLE_P (decl
) = bitfield
;
12915 if (bitfield
&& !unqualified_id
)
12917 TREE_NO_WARNING (decl
) = 1;
12918 DECL_PADDING_P (decl
) = 1;
12921 if (storage_class
== sc_mutable
)
12923 DECL_MUTABLE_P (decl
) = 1;
12924 storage_class
= sc_none
;
12929 /* An attempt is being made to initialize a non-static
12930 member. This is new in C++11. */
12931 maybe_warn_cpp0x (CPP0X_NSDMI
);
12933 /* If this has been parsed with static storage class, but
12934 errors forced staticp to be cleared, ensure NSDMI is
12936 if (declspecs
->storage_class
== sc_static
)
12937 DECL_INITIAL (decl
) = error_mark_node
;
12941 bad_specifiers (decl
, BSP_FIELD
, virtualp
,
12942 memfn_quals
!= TYPE_UNQUALIFIED
,
12943 staticp
? false : inlinep
, friendp
,
12944 raises
!= NULL_TREE
,
12945 declspecs
->locations
);
12948 else if (FUNC_OR_METHOD_TYPE_P (type
))
12950 tree original_name
;
12953 if (!unqualified_id
)
12954 return error_mark_node
;
12956 if (TREE_CODE (unqualified_id
) == TEMPLATE_ID_EXPR
)
12957 original_name
= dname
;
12959 original_name
= unqualified_id
;
12960 // FIXME:gcc_assert (original_name == dname);
12962 if (storage_class
== sc_auto
)
12963 error_at (declspecs
->locations
[ds_storage_class
],
12964 "storage class %<auto%> invalid for function %qs", name
);
12965 else if (storage_class
== sc_register
)
12966 error_at (declspecs
->locations
[ds_storage_class
],
12967 "storage class %<register%> invalid for function %qs",
12971 if (declspecs
->gnu_thread_keyword_p
)
12972 error_at (declspecs
->locations
[ds_thread
],
12973 "storage class %<__thread%> invalid for function %qs",
12976 error_at (declspecs
->locations
[ds_thread
],
12977 "storage class %<thread_local%> invalid for "
12978 "function %qs", name
);
12981 if (virt_specifiers
)
12982 error ("virt-specifiers in %qs not allowed outside a class "
12983 "definition", name
);
12984 /* Function declaration not at top level.
12985 Storage classes other than `extern' are not allowed
12986 and `extern' makes no difference. */
12987 if (! toplevel_bindings_p ()
12988 && (storage_class
== sc_static
12989 || decl_spec_seq_has_spec_p (declspecs
, ds_inline
))
12992 if (storage_class
== sc_static
)
12993 pedwarn (declspecs
->locations
[ds_storage_class
], OPT_Wpedantic
,
12994 "%<static%> specifier invalid for function %qs "
12995 "declared out of global scope", name
);
12997 pedwarn (declspecs
->locations
[ds_inline
], OPT_Wpedantic
,
12998 "%<inline%> specifier invalid for function %qs "
12999 "declared out of global scope", name
);
13002 if (ctype
== NULL_TREE
)
13006 error ("virtual non-class function %qs", name
);
13009 else if (sfk
== sfk_constructor
13010 || sfk
== sfk_destructor
)
13012 error (funcdef_flag
13013 ? G_("%qs defined in a non-class scope")
13014 : G_("%qs declared in a non-class scope"), name
);
13019 /* Record whether the function is public. */
13020 publicp
= (ctype
!= NULL_TREE
13021 || storage_class
!= sc_static
);
13023 decl
= grokfndecl (ctype
, type
, original_name
, parms
, unqualified_id
,
13025 reqs
, virtualp
, flags
, memfn_quals
, rqual
, raises
,
13028 inlinep
| (2 * constexpr_p
) | (4 * concept_p
),
13029 initialized
== SD_DELETED
,
13032 late_return_type_p
,
13033 template_count
, in_namespace
, attrlist
,
13035 if (decl
== NULL_TREE
)
13036 return error_mark_node
;
13038 if (explicitp
== 2)
13039 DECL_NONCONVERTING_P (decl
) = 1;
13042 int invalid_static
= 0;
13044 /* Don't allow a static member function in a class, and forbid
13045 declaring main to be static. */
13046 if (TREE_CODE (type
) == METHOD_TYPE
)
13048 permerror (input_location
, "cannot declare member function %qD to have "
13049 "static linkage", decl
);
13050 invalid_static
= 1;
13052 else if (current_function_decl
)
13054 /* 7.1.1: There can be no static function declarations within a
13056 error_at (declspecs
->locations
[ds_storage_class
],
13057 "cannot declare static function inside another function");
13058 invalid_static
= 1;
13061 if (invalid_static
)
13064 storage_class
= sc_none
;
13070 /* It's a variable. */
13072 /* An uninitialized decl with `extern' is a reference. */
13073 decl
= grokvardecl (type
, dname
, unqualified_id
,
13080 ctype
? ctype
: in_namespace
,
13082 if (decl
== NULL_TREE
)
13083 return error_mark_node
;
13085 bad_specifiers (decl
, BSP_VAR
, virtualp
,
13086 memfn_quals
!= TYPE_UNQUALIFIED
,
13087 inlinep
, friendp
, raises
!= NULL_TREE
,
13088 declspecs
->locations
);
13092 DECL_CONTEXT (decl
) = ctype
;
13095 permerror (declspecs
->locations
[ds_storage_class
],
13096 "%<static%> may not be used when defining "
13097 "(as opposed to declaring) a static data member");
13099 storage_class
= sc_none
;
13101 if (storage_class
== sc_register
&& TREE_STATIC (decl
))
13103 error ("static member %qD declared %<register%>", decl
);
13104 storage_class
= sc_none
;
13106 if (storage_class
== sc_extern
&& pedantic
)
13108 pedwarn (input_location
, OPT_Wpedantic
,
13109 "cannot explicitly declare member %q#D to have "
13110 "extern linkage", decl
);
13111 storage_class
= sc_none
;
13114 else if (constexpr_p
&& DECL_EXTERNAL (decl
))
13116 error_at (DECL_SOURCE_LOCATION (decl
),
13117 "declaration of %<constexpr%> variable %qD "
13118 "is not a definition", decl
);
13119 constexpr_p
= false;
13123 mark_inline_variable (decl
, declspecs
->locations
[ds_inline
]);
13124 if (innermost_code
== cdk_decomp
)
13126 gcc_assert (declarator
&& declarator
->kind
== cdk_decomp
);
13127 DECL_SOURCE_LOCATION (decl
) = id_loc
;
13128 DECL_ARTIFICIAL (decl
) = 1;
13129 fit_decomposition_lang_decl (decl
, NULL_TREE
);
13133 if (VAR_P (decl
) && !initialized
)
13134 if (tree auto_node
= type_uses_auto (type
))
13135 if (!CLASS_PLACEHOLDER_TEMPLATE (auto_node
))
13137 location_t loc
= declspecs
->locations
[ds_type_spec
];
13138 error_at (loc
, "declaration of %q#D has no initializer", decl
);
13139 TREE_TYPE (decl
) = error_mark_node
;
13142 if (storage_class
== sc_extern
&& initialized
&& !funcdef_flag
)
13144 if (toplevel_bindings_p ())
13146 /* It's common practice (and completely valid) to have a const
13147 be initialized and declared extern. */
13148 if (!(type_quals
& TYPE_QUAL_CONST
))
13149 warning_at (DECL_SOURCE_LOCATION (decl
), 0,
13150 "%qs initialized and declared %<extern%>", name
);
13154 error_at (DECL_SOURCE_LOCATION (decl
),
13155 "%qs has both %<extern%> and initializer", name
);
13156 return error_mark_node
;
13160 /* Record `register' declaration for warnings on &
13161 and in case doing stupid register allocation. */
13163 if (storage_class
== sc_register
)
13165 DECL_REGISTER (decl
) = 1;
13166 /* Warn about register storage specifiers on PARM_DECLs. */
13167 if (TREE_CODE (decl
) == PARM_DECL
)
13169 if (cxx_dialect
>= cxx17
)
13170 pedwarn (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
13171 "ISO C++17 does not allow %<register%> storage "
13172 "class specifier");
13174 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
13175 "%<register%> storage class specifier used");
13178 else if (storage_class
== sc_extern
)
13179 DECL_THIS_EXTERN (decl
) = 1;
13180 else if (storage_class
== sc_static
)
13181 DECL_THIS_STATIC (decl
) = 1;
13183 /* Set constexpr flag on vars (functions got it in grokfndecl). */
13184 if (constexpr_p
&& VAR_P (decl
))
13185 DECL_DECLARED_CONSTEXPR_P (decl
) = true;
13187 /* Record constancy and volatility on the DECL itself . There's
13188 no need to do this when processing a template; we'll do this
13189 for the instantiated declaration based on the type of DECL. */
13190 if (!processing_template_decl
)
13191 cp_apply_type_quals_to_decl (type_quals
, decl
);
13197 /* Subroutine of start_function. Ensure that each of the parameter
13198 types (as listed in PARMS) is complete, as is required for a
13199 function definition. */
13202 require_complete_types_for_parms (tree parms
)
13204 for (; parms
; parms
= DECL_CHAIN (parms
))
13206 if (dependent_type_p (TREE_TYPE (parms
)))
13208 if (!VOID_TYPE_P (TREE_TYPE (parms
))
13209 && complete_type_or_else (TREE_TYPE (parms
), parms
))
13211 relayout_decl (parms
);
13212 DECL_ARG_TYPE (parms
) = type_passed_as (TREE_TYPE (parms
));
13214 maybe_warn_parm_abi (TREE_TYPE (parms
),
13215 DECL_SOURCE_LOCATION (parms
));
13218 /* grokparms or complete_type_or_else will have already issued
13220 TREE_TYPE (parms
) = error_mark_node
;
13224 /* Returns nonzero if T is a local variable. */
13227 local_variable_p (const_tree t
)
13230 /* A VAR_DECL with a context that is a _TYPE is a static data
13232 && !TYPE_P (CP_DECL_CONTEXT (t
))
13233 /* Any other non-local variable must be at namespace scope. */
13234 && !DECL_NAMESPACE_SCOPE_P (t
))
13235 || (TREE_CODE (t
) == PARM_DECL
))
13241 /* Like local_variable_p, but suitable for use as a tree-walking
13245 local_variable_p_walkfn (tree
*tp
, int *walk_subtrees
,
13248 if (local_variable_p (*tp
)
13249 && (!DECL_ARTIFICIAL (*tp
) || DECL_NAME (*tp
) == this_identifier
))
13251 else if (TYPE_P (*tp
))
13252 *walk_subtrees
= 0;
13257 /* Check that ARG, which is a default-argument expression for a
13258 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
13259 something goes wrong. DECL may also be a _TYPE node, rather than a
13260 DECL, if there is no DECL available. */
13263 check_default_argument (tree decl
, tree arg
, tsubst_flags_t complain
)
13268 if (TREE_CODE (arg
) == DEFERRED_PARSE
)
13269 /* We get a DEFERRED_PARSE when looking at an in-class declaration
13270 with a default argument. Ignore the argument for now; we'll
13271 deal with it after the class is complete. */
13280 decl_type
= TREE_TYPE (decl
);
13282 if (arg
== error_mark_node
13283 || decl
== error_mark_node
13284 || TREE_TYPE (arg
) == error_mark_node
13285 || decl_type
== error_mark_node
)
13286 /* Something already went wrong. There's no need to check
13288 return error_mark_node
;
13290 /* [dcl.fct.default]
13292 A default argument expression is implicitly converted to the
13294 ++cp_unevaluated_operand
;
13295 /* Avoid digest_init clobbering the initializer. */
13296 tree carg
= BRACE_ENCLOSED_INITIALIZER_P (arg
) ? unshare_expr (arg
): arg
;
13297 perform_implicit_conversion_flags (decl_type
, carg
, complain
,
13299 --cp_unevaluated_operand
;
13301 /* Avoid redundant -Wzero-as-null-pointer-constant warnings at
13303 if (TYPE_PTR_OR_PTRMEM_P (decl_type
)
13304 && null_ptr_cst_p (arg
)
13305 /* Don't lose side-effects as in PR90473. */
13306 && !TREE_SIDE_EFFECTS (arg
))
13307 return nullptr_node
;
13309 /* [dcl.fct.default]
13311 Local variables shall not be used in default argument
13314 The keyword `this' shall not be used in a default argument of a
13315 member function. */
13316 var
= cp_walk_tree_without_duplicates (&arg
, local_variable_p_walkfn
, NULL
);
13319 if (complain
& tf_warning_or_error
)
13321 if (DECL_NAME (var
) == this_identifier
)
13322 permerror (input_location
, "default argument %qE uses %qD",
13325 error ("default argument %qE uses local variable %qD", arg
, var
);
13327 return error_mark_node
;
13334 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
13337 type_is_deprecated (tree type
)
13339 enum tree_code code
;
13340 if (TREE_DEPRECATED (type
))
13342 if (TYPE_NAME (type
))
13344 if (TREE_DEPRECATED (TYPE_NAME (type
)))
13348 cp_warn_deprecated_use_scopes (CP_DECL_CONTEXT (TYPE_NAME (type
)));
13353 /* Do warn about using typedefs to a deprecated class. */
13354 if (OVERLOAD_TYPE_P (type
) && type
!= TYPE_MAIN_VARIANT (type
))
13355 return type_is_deprecated (TYPE_MAIN_VARIANT (type
));
13357 code
= TREE_CODE (type
);
13359 if (code
== POINTER_TYPE
|| code
== REFERENCE_TYPE
13360 || code
== OFFSET_TYPE
|| code
== FUNCTION_TYPE
13361 || code
== METHOD_TYPE
|| code
== ARRAY_TYPE
)
13362 return type_is_deprecated (TREE_TYPE (type
));
13364 if (TYPE_PTRMEMFUNC_P (type
))
13365 return type_is_deprecated
13366 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type
))));
13371 /* Decode the list of parameter types for a function type.
13372 Given the list of things declared inside the parens,
13373 return a list of types.
13375 If this parameter does not end with an ellipsis, we append
13378 *PARMS is set to the chain of PARM_DECLs created. */
13381 grokparms (tree parmlist
, tree
*parms
)
13383 tree result
= NULL_TREE
;
13384 tree decls
= NULL_TREE
;
13388 for (parm
= parmlist
; parm
!= NULL_TREE
; parm
= TREE_CHAIN (parm
))
13390 tree type
= NULL_TREE
;
13391 tree init
= TREE_PURPOSE (parm
);
13392 tree decl
= TREE_VALUE (parm
);
13394 if (parm
== void_list_node
)
13397 if (! decl
|| TREE_TYPE (decl
) == error_mark_node
)
13400 type
= TREE_TYPE (decl
);
13401 if (VOID_TYPE_P (type
))
13403 if (same_type_p (type
, void_type_node
)
13405 && !DECL_NAME (decl
) && !result
13406 && TREE_CHAIN (parm
) == void_list_node
)
13407 /* DR 577: A parameter list consisting of a single
13408 unnamed parameter of non-dependent type 'void'. */
13410 else if (cv_qualified_p (type
))
13411 error_at (DECL_SOURCE_LOCATION (decl
),
13412 "invalid use of cv-qualified type %qT in "
13413 "parameter declaration", type
);
13415 error_at (DECL_SOURCE_LOCATION (decl
),
13416 "invalid use of type %<void%> in parameter "
13418 /* It's not a good idea to actually create parameters of
13419 type `void'; other parts of the compiler assume that a
13420 void type terminates the parameter list. */
13421 type
= error_mark_node
;
13422 TREE_TYPE (decl
) = error_mark_node
;
13425 if (type
!= error_mark_node
)
13427 if (deprecated_state
!= DEPRECATED_SUPPRESS
)
13429 tree deptype
= type_is_deprecated (type
);
13431 cp_warn_deprecated_use (deptype
);
13434 /* [dcl.fct] "A parameter with volatile-qualified type is
13436 if (CP_TYPE_VOLATILE_P (type
))
13437 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wvolatile
,
13438 "%<volatile%>-qualified parameter is "
13441 /* Top-level qualifiers on the parameters are
13442 ignored for function types. */
13443 type
= cp_build_qualified_type (type
, 0);
13444 if (TREE_CODE (type
) == METHOD_TYPE
)
13446 error ("parameter %qD invalidly declared method type", decl
);
13447 type
= build_pointer_type (type
);
13448 TREE_TYPE (decl
) = type
;
13450 else if (abstract_virtuals_error (decl
, type
))
13451 any_error
= 1; /* Seems like a good idea. */
13452 else if (cxx_dialect
< cxx17
&& INDIRECT_TYPE_P (type
))
13454 /* Before C++17 DR 393:
13455 [dcl.fct]/6, parameter types cannot contain pointers
13456 (references) to arrays of unknown bound. */
13457 tree t
= TREE_TYPE (type
);
13458 int ptr
= TYPE_PTR_P (type
);
13462 if (TYPE_PTR_P (t
))
13464 else if (TREE_CODE (t
) != ARRAY_TYPE
)
13466 else if (!TYPE_DOMAIN (t
))
13470 if (TREE_CODE (t
) == ARRAY_TYPE
)
13471 pedwarn (DECL_SOURCE_LOCATION (decl
), OPT_Wpedantic
,
13473 ? G_("parameter %qD includes pointer to array of "
13474 "unknown bound %qT")
13475 : G_("parameter %qD includes reference to array of "
13476 "unknown bound %qT"),
13482 else if (init
&& !processing_template_decl
)
13483 init
= check_default_argument (decl
, init
, tf_warning_or_error
);
13486 DECL_CHAIN (decl
) = decls
;
13488 result
= tree_cons (init
, type
, result
);
13490 decls
= nreverse (decls
);
13491 result
= nreverse (result
);
13493 result
= chainon (result
, void_list_node
);
13500 /* D is a constructor or overloaded `operator='.
13502 Let T be the class in which D is declared. Then, this function
13505 -1 if D's is an ill-formed constructor or copy assignment operator
13506 whose first parameter is of type `T'.
13507 0 if D is not a copy constructor or copy assignment
13509 1 if D is a copy constructor or copy assignment operator whose
13510 first parameter is a reference to non-const qualified T.
13511 2 if D is a copy constructor or copy assignment operator whose
13512 first parameter is a reference to const qualified T.
13514 This function can be used as a predicate. Positive values indicate
13515 a copy constructor and nonzero values indicate a copy assignment
13519 copy_fn_p (const_tree d
)
13525 gcc_assert (DECL_FUNCTION_MEMBER_P (d
));
13527 if (TREE_CODE (d
) == TEMPLATE_DECL
13528 || (DECL_TEMPLATE_INFO (d
)
13529 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d
))))
13530 /* Instantiations of template member functions are never copy
13531 functions. Note that member functions of templated classes are
13532 represented as template functions internally, and we must
13533 accept those as copy functions. */
13536 args
= FUNCTION_FIRST_USER_PARMTYPE (d
);
13540 arg_type
= TREE_VALUE (args
);
13541 if (arg_type
== error_mark_node
)
13544 if (TYPE_MAIN_VARIANT (arg_type
) == DECL_CONTEXT (d
))
13546 /* Pass by value copy assignment operator. */
13549 else if (TYPE_REF_P (arg_type
)
13550 && !TYPE_REF_IS_RVALUE (arg_type
)
13551 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type
)) == DECL_CONTEXT (d
))
13553 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type
)))
13559 args
= TREE_CHAIN (args
);
13561 if (args
&& args
!= void_list_node
&& !TREE_PURPOSE (args
))
13562 /* There are more non-optional args. */
13568 /* D is a constructor or overloaded `operator='.
13570 Let T be the class in which D is declared. Then, this function
13571 returns true when D is a move constructor or move assignment
13572 operator, false otherwise. */
13575 move_fn_p (const_tree d
)
13577 gcc_assert (DECL_FUNCTION_MEMBER_P (d
));
13579 if (cxx_dialect
== cxx98
)
13580 /* There are no move constructors if we are in C++98 mode. */
13583 if (TREE_CODE (d
) == TEMPLATE_DECL
13584 || (DECL_TEMPLATE_INFO (d
)
13585 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d
))))
13586 /* Instantiations of template member functions are never move
13587 functions. Note that member functions of templated classes are
13588 represented as template functions internally, and we must
13589 accept those as move functions. */
13592 return move_signature_fn_p (d
);
13595 /* D is a constructor or overloaded `operator='.
13597 Then, this function returns true when D has the same signature as a move
13598 constructor or move assignment operator (because either it is such a
13599 ctor/op= or it is a template specialization with the same signature),
13600 false otherwise. */
13603 move_signature_fn_p (const_tree d
)
13607 bool result
= false;
13609 args
= FUNCTION_FIRST_USER_PARMTYPE (d
);
13613 arg_type
= TREE_VALUE (args
);
13614 if (arg_type
== error_mark_node
)
13617 if (TYPE_REF_P (arg_type
)
13618 && TYPE_REF_IS_RVALUE (arg_type
)
13619 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type
)),
13623 args
= TREE_CHAIN (args
);
13625 if (args
&& args
!= void_list_node
&& !TREE_PURPOSE (args
))
13626 /* There are more non-optional args. */
13632 /* Remember any special properties of member function DECL. */
13635 grok_special_member_properties (tree decl
)
13639 if (TREE_CODE (decl
) == USING_DECL
13640 || !DECL_NONSTATIC_MEMBER_FUNCTION_P (decl
))
13643 class_type
= DECL_CONTEXT (decl
);
13644 if (IDENTIFIER_CTOR_P (DECL_NAME (decl
)))
13646 int ctor
= copy_fn_p (decl
);
13648 if (!DECL_ARTIFICIAL (decl
))
13649 TYPE_HAS_USER_CONSTRUCTOR (class_type
) = 1;
13655 A non-template constructor for class X is a copy
13656 constructor if its first parameter is of type X&, const
13657 X&, volatile X& or const volatile X&, and either there
13658 are no other parameters or else all other parameters have
13659 default arguments. */
13660 TYPE_HAS_COPY_CTOR (class_type
) = 1;
13662 TYPE_HAS_CONST_COPY_CTOR (class_type
) = 1;
13664 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl
)))
13665 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type
) = 1;
13666 else if (is_list_ctor (decl
))
13667 TYPE_HAS_LIST_CTOR (class_type
) = 1;
13669 if (DECL_DECLARED_CONSTEXPR_P (decl
)
13670 && !ctor
&& !move_fn_p (decl
))
13671 TYPE_HAS_CONSTEXPR_CTOR (class_type
) = 1;
13673 else if (DECL_NAME (decl
) == assign_op_identifier
)
13677 A non-template assignment operator for class X is a copy
13678 assignment operator if its parameter is of type X, X&, const
13679 X&, volatile X& or const volatile X&. */
13681 int assop
= copy_fn_p (decl
);
13685 TYPE_HAS_COPY_ASSIGN (class_type
) = 1;
13687 TYPE_HAS_CONST_COPY_ASSIGN (class_type
) = 1;
13690 else if (IDENTIFIER_CONV_OP_P (DECL_NAME (decl
)))
13691 TYPE_HAS_CONVERSION (class_type
) = true;
13693 /* Destructors are handled in check_methods. */
13696 /* Check a constructor DECL has the correct form. Complains
13697 if the class has a constructor of the form X(X). */
13700 grok_ctor_properties (const_tree ctype
, const_tree decl
)
13702 int ctor_parm
= copy_fn_p (decl
);
13708 A declaration of a constructor for a class X is ill-formed if
13709 its first parameter is of type (optionally cv-qualified) X
13710 and either there are no other parameters or else all other
13711 parameters have default arguments.
13713 We *don't* complain about member template instantiations that
13714 have this form, though; they can occur as we try to decide
13715 what constructor to use during overload resolution. Since
13716 overload resolution will never prefer such a constructor to
13717 the non-template copy constructor (which is either explicitly
13718 or implicitly defined), there's no need to worry about their
13719 existence. Theoretically, they should never even be
13720 instantiated, but that's hard to forestall. */
13721 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
13729 /* DECL is a declaration for an overloaded or conversion operator. If
13730 COMPLAIN is true, errors are issued for invalid declarations. */
13733 grok_op_properties (tree decl
, bool complain
)
13735 tree argtypes
= TYPE_ARG_TYPES (TREE_TYPE (decl
));
13736 bool methodp
= TREE_CODE (TREE_TYPE (decl
)) == METHOD_TYPE
;
13737 tree name
= DECL_NAME (decl
);
13738 location_t loc
= DECL_SOURCE_LOCATION (decl
);
13740 tree class_type
= DECL_CONTEXT (decl
);
13741 if (class_type
&& !CLASS_TYPE_P (class_type
))
13742 class_type
= NULL_TREE
;
13744 tree_code operator_code
;
13746 if (IDENTIFIER_CONV_OP_P (name
))
13748 /* Conversion operators are TYPE_EXPR for the purposes of this
13750 operator_code
= TYPE_EXPR
;
13751 op_flags
= OVL_OP_FLAG_UNARY
;
13755 const ovl_op_info_t
*ovl_op
= IDENTIFIER_OVL_OP_INFO (name
);
13757 operator_code
= ovl_op
->tree_code
;
13758 op_flags
= ovl_op
->flags
;
13759 gcc_checking_assert (operator_code
!= ERROR_MARK
);
13760 DECL_OVERLOADED_OPERATOR_CODE_RAW (decl
) = ovl_op
->ovl_op_code
;
13763 if (op_flags
& OVL_OP_FLAG_ALLOC
)
13765 /* operator new and operator delete are quite special. */
13769 case OVL_OP_FLAG_ALLOC
:
13770 TYPE_HAS_NEW_OPERATOR (class_type
) = 1;
13773 case OVL_OP_FLAG_ALLOC
| OVL_OP_FLAG_DELETE
:
13774 TYPE_GETS_DELETE (class_type
) |= 1;
13777 case OVL_OP_FLAG_ALLOC
| OVL_OP_FLAG_VEC
:
13778 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type
) = 1;
13781 case OVL_OP_FLAG_ALLOC
| OVL_OP_FLAG_DELETE
| OVL_OP_FLAG_VEC
:
13782 TYPE_GETS_DELETE (class_type
) |= 2;
13786 gcc_unreachable ();
13789 /* [basic.std.dynamic.allocation]/1:
13791 A program is ill-formed if an allocation function is declared
13792 in a namespace scope other than global scope or declared
13793 static in global scope.
13795 The same also holds true for deallocation functions. */
13796 if (DECL_NAMESPACE_SCOPE_P (decl
))
13798 if (CP_DECL_CONTEXT (decl
) != global_namespace
)
13800 error_at (loc
, "%qD may not be declared within a namespace",
13805 if (!TREE_PUBLIC (decl
))
13807 error_at (loc
, "%qD may not be declared as static", decl
);
13812 if (op_flags
& OVL_OP_FLAG_DELETE
)
13814 DECL_SET_IS_OPERATOR_DELETE (decl
, true);
13815 coerce_delete_type (decl
, loc
);
13819 DECL_SET_IS_OPERATOR_NEW (decl
, true);
13820 TREE_TYPE (decl
) = coerce_new_type (TREE_TYPE (decl
), loc
);
13826 /* An operator function must either be a non-static member function
13827 or have at least one parameter of a class, a reference to a class,
13828 an enumeration, or a reference to an enumeration. 13.4.0.6 */
13829 if (! methodp
|| DECL_STATIC_FUNCTION_P (decl
))
13831 if (operator_code
== TYPE_EXPR
13832 || operator_code
== CALL_EXPR
13833 || operator_code
== COMPONENT_REF
13834 || operator_code
== ARRAY_REF
13835 || operator_code
== NOP_EXPR
)
13837 error_at (loc
, "%qD must be a nonstatic member function", decl
);
13841 if (DECL_STATIC_FUNCTION_P (decl
))
13843 error_at (loc
, "%qD must be either a non-static member "
13844 "function or a non-member function", decl
);
13848 for (tree arg
= argtypes
; ; arg
= TREE_CHAIN (arg
))
13850 if (!arg
|| arg
== void_list_node
)
13853 error_at(loc
, "%qD must have an argument of class or "
13854 "enumerated type", decl
);
13858 tree type
= non_reference (TREE_VALUE (arg
));
13859 if (type
== error_mark_node
)
13862 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
13863 because these checks are performed even on template
13865 if (MAYBE_CLASS_TYPE_P (type
)
13866 || TREE_CODE (type
) == ENUMERAL_TYPE
)
13871 if (operator_code
== CALL_EXPR
)
13872 /* There are no further restrictions on the arguments to an overloaded
13876 if (operator_code
== COND_EXPR
)
13879 error_at (loc
, "ISO C++ prohibits overloading %<operator ?:%>");
13883 /* Count the number of arguments and check for ellipsis. */
13885 for (tree arg
= argtypes
; arg
!= void_list_node
; arg
= TREE_CHAIN (arg
))
13890 error_at (loc
, "%qD must not have variable number of arguments",
13897 /* Verify correct number of arguments. */
13900 case OVL_OP_FLAG_AMBIARY
:
13903 /* We have a unary instance of an ambi-ary op. Remap to the
13905 unsigned alt
= ovl_op_alternate
[ovl_op_mapping
[operator_code
]];
13906 const ovl_op_info_t
*ovl_op
= &ovl_op_info
[false][alt
];
13907 gcc_checking_assert (ovl_op
->flags
== OVL_OP_FLAG_UNARY
);
13908 operator_code
= ovl_op
->tree_code
;
13909 DECL_OVERLOADED_OPERATOR_CODE_RAW (decl
) = ovl_op
->ovl_op_code
;
13911 else if (arity
!= 2)
13913 /* This was an ambiguous operator but is invalid. */
13916 ? G_("%qD must have either zero or one argument")
13917 : G_("%qD must have either one or two arguments"), decl
);
13920 else if ((operator_code
== POSTINCREMENT_EXPR
13921 || operator_code
== POSTDECREMENT_EXPR
)
13922 && ! processing_template_decl
13923 /* x++ and x--'s second argument must be an int. */
13924 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes
)),
13925 integer_type_node
))
13929 ? G_("postfix %qD must have %<int%> as its argument")
13930 : G_("postfix %qD must have %<int%> as its second argument"),
13936 case OVL_OP_FLAG_UNARY
:
13941 ? G_("%qD must have no arguments")
13942 : G_("%qD must have exactly one argument"), decl
);
13947 case OVL_OP_FLAG_BINARY
:
13952 ? G_("%qD must have exactly one argument")
13953 : G_("%qD must have exactly two arguments"), decl
);
13959 gcc_unreachable ();
13962 /* There can be no default arguments. */
13963 for (tree arg
= argtypes
; arg
!= void_list_node
; arg
= TREE_CHAIN (arg
))
13964 if (TREE_PURPOSE (arg
))
13966 TREE_PURPOSE (arg
) = NULL_TREE
;
13967 error_at (loc
, "%qD cannot have default arguments", decl
);
13971 /* At this point the declaration is well-formed. It may not be
13972 sensible though. */
13974 /* Check member function warnings only on the in-class declaration.
13975 There's no point warning on an out-of-class definition. */
13976 if (class_type
&& class_type
!= current_class_type
)
13979 /* Warn about conversion operators that will never be used. */
13980 if (IDENTIFIER_CONV_OP_P (name
)
13981 && ! DECL_TEMPLATE_INFO (decl
)
13982 && warn_class_conversion
)
13984 tree t
= TREE_TYPE (name
);
13985 int ref
= TYPE_REF_P (t
);
13988 t
= TYPE_MAIN_VARIANT (TREE_TYPE (t
));
13990 if (VOID_TYPE_P (t
))
13991 warning_at (loc
, OPT_Wclass_conversion
, "converting %qT to %<void%> "
13992 "will never use a type conversion operator", class_type
);
13993 else if (class_type
)
13995 if (same_type_ignoring_top_level_qualifiers_p (t
, class_type
))
13996 warning_at (loc
, OPT_Wclass_conversion
,
13998 ? G_("converting %qT to a reference to the same type "
13999 "will never use a type conversion operator")
14000 : G_("converting %qT to the same type "
14001 "will never use a type conversion operator"),
14003 /* Don't force t to be complete here. */
14004 else if (MAYBE_CLASS_TYPE_P (t
)
14005 && COMPLETE_TYPE_P (t
)
14006 && DERIVED_FROM_P (t
, class_type
))
14007 warning_at (loc
, OPT_Wclass_conversion
,
14009 ? G_("converting %qT to a reference to a base class "
14010 "%qT will never use a type conversion operator")
14011 : G_("converting %qT to a base class %qT "
14012 "will never use a type conversion operator"),
14020 /* Effective C++ rules below. */
14022 /* More Effective C++ rule 7. */
14023 if (operator_code
== TRUTH_ANDIF_EXPR
14024 || operator_code
== TRUTH_ORIF_EXPR
14025 || operator_code
== COMPOUND_EXPR
)
14026 warning_at (loc
, OPT_Weffc__
,
14027 "user-defined %qD always evaluates both arguments", decl
);
14029 /* More Effective C++ rule 6. */
14030 if (operator_code
== POSTINCREMENT_EXPR
14031 || operator_code
== POSTDECREMENT_EXPR
14032 || operator_code
== PREINCREMENT_EXPR
14033 || operator_code
== PREDECREMENT_EXPR
)
14035 tree arg
= TREE_VALUE (argtypes
);
14036 tree ret
= TREE_TYPE (TREE_TYPE (decl
));
14037 if (methodp
|| TYPE_REF_P (arg
))
14038 arg
= TREE_TYPE (arg
);
14039 arg
= TYPE_MAIN_VARIANT (arg
);
14041 if (operator_code
== PREINCREMENT_EXPR
14042 || operator_code
== PREDECREMENT_EXPR
)
14044 if (!TYPE_REF_P (ret
)
14045 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret
)), arg
))
14046 warning_at (loc
, OPT_Weffc__
, "prefix %qD should return %qT", decl
,
14047 build_reference_type (arg
));
14051 if (!same_type_p (TYPE_MAIN_VARIANT (ret
), arg
))
14052 warning_at (loc
, OPT_Weffc__
,
14053 "postfix %qD should return %qT", decl
, arg
);
14057 /* Effective C++ rule 23. */
14058 if (!DECL_ASSIGNMENT_OPERATOR_P (decl
)
14059 && (operator_code
== PLUS_EXPR
14060 || operator_code
== MINUS_EXPR
14061 || operator_code
== TRUNC_DIV_EXPR
14062 || operator_code
== MULT_EXPR
14063 || operator_code
== TRUNC_MOD_EXPR
)
14064 && TYPE_REF_P (TREE_TYPE (TREE_TYPE (decl
))))
14065 warning_at (loc
, OPT_Weffc__
, "%qD should return by value", decl
);
14070 /* Return a string giving the keyword associate with CODE. */
14072 static const char *
14073 tag_name (enum tag_types code
)
14085 case typename_type
:
14088 gcc_unreachable ();
14092 /* Name lookup in an elaborated-type-specifier (after the keyword
14093 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
14094 elaborated-type-specifier is invalid, issue a diagnostic and return
14095 error_mark_node; otherwise, return the *_TYPE to which it referred.
14096 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
14099 check_elaborated_type_specifier (enum tag_types tag_code
,
14101 bool allow_template_p
)
14107 struct S { struct S *p; };
14109 name lookup will find the TYPE_DECL for the implicit "S::S"
14110 typedef. Adjust for that here. */
14111 if (DECL_SELF_REFERENCE_P (decl
))
14112 decl
= TYPE_NAME (TREE_TYPE (decl
));
14114 type
= TREE_TYPE (decl
);
14116 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
14117 is false for this case as well. */
14118 if (TREE_CODE (type
) == TEMPLATE_TYPE_PARM
)
14120 error ("using template type parameter %qT after %qs",
14121 type
, tag_name (tag_code
));
14122 return error_mark_node
;
14124 /* Accept template template parameters. */
14125 else if (allow_template_p
14126 && (TREE_CODE (type
) == BOUND_TEMPLATE_TEMPLATE_PARM
14127 || TREE_CODE (type
) == TEMPLATE_TEMPLATE_PARM
))
14131 If the identifier resolves to a typedef-name or the
14132 simple-template-id resolves to an alias template
14133 specialization, the elaborated-type-specifier is ill-formed.
14135 In other words, the only legitimate declaration to use in the
14136 elaborated type specifier is the implicit typedef created when
14137 the type is declared. */
14138 else if (!DECL_IMPLICIT_TYPEDEF_P (decl
)
14139 && !DECL_SELF_REFERENCE_P (decl
)
14140 && tag_code
!= typename_type
)
14142 if (alias_template_specialization_p (type
))
14143 error ("using alias template specialization %qT after %qs",
14144 type
, tag_name (tag_code
));
14146 error ("using typedef-name %qD after %qs", decl
, tag_name (tag_code
));
14147 inform (DECL_SOURCE_LOCATION (decl
),
14148 "%qD has a previous declaration here", decl
);
14149 return error_mark_node
;
14151 else if (TREE_CODE (type
) != RECORD_TYPE
14152 && TREE_CODE (type
) != UNION_TYPE
14153 && tag_code
!= enum_type
14154 && tag_code
!= typename_type
)
14156 error ("%qT referred to as %qs", type
, tag_name (tag_code
));
14157 inform (location_of (type
), "%qT has a previous declaration here", type
);
14158 return error_mark_node
;
14160 else if (TREE_CODE (type
) != ENUMERAL_TYPE
14161 && tag_code
== enum_type
)
14163 error ("%qT referred to as enum", type
);
14164 inform (location_of (type
), "%qT has a previous declaration here", type
);
14165 return error_mark_node
;
14167 else if (!allow_template_p
14168 && TREE_CODE (type
) == RECORD_TYPE
14169 && CLASSTYPE_IS_TEMPLATE (type
))
14171 /* If a class template appears as elaborated type specifier
14172 without a template header such as:
14174 template <class T> class C {};
14175 void f(class C); // No template header here
14177 then the required template argument is missing. */
14178 error ("template argument required for %<%s %T%>",
14179 tag_name (tag_code
),
14180 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type
)));
14181 return error_mark_node
;
14187 /* Lookup NAME in elaborate type specifier in scope according to
14188 SCOPE and issue diagnostics if necessary.
14189 Return *_TYPE node upon success, NULL_TREE when the NAME is not
14190 found, and ERROR_MARK_NODE for type error. */
14193 lookup_and_check_tag (enum tag_types tag_code
, tree name
,
14194 tag_scope scope
, bool template_header_p
)
14198 if (scope
== ts_global
)
14200 /* First try ordinary name lookup, ignoring hidden class name
14201 injected via friend declaration. */
14202 decl
= lookup_name_prefer_type (name
, 2);
14203 decl
= strip_using_decl (decl
);
14204 /* If that fails, the name will be placed in the smallest
14205 non-class, non-function-prototype scope according to 3.3.1/5.
14206 We may already have a hidden name declared as friend in this
14207 scope. So lookup again but not ignoring hidden names.
14208 If we find one, that name will be made visible rather than
14209 creating a new tag. */
14211 decl
= lookup_type_scope (name
, ts_within_enclosing_non_class
);
14214 decl
= lookup_type_scope (name
, scope
);
14217 && (DECL_CLASS_TEMPLATE_P (decl
)
14218 /* If scope is ts_current we're defining a class, so ignore a
14219 template template parameter. */
14220 || (scope
!= ts_current
14221 && DECL_TEMPLATE_TEMPLATE_PARM_P (decl
))))
14222 decl
= DECL_TEMPLATE_RESULT (decl
);
14224 if (decl
&& TREE_CODE (decl
) == TYPE_DECL
)
14226 /* Look for invalid nested type:
14230 if (scope
== ts_current
&& DECL_SELF_REFERENCE_P (decl
))
14232 error ("%qD has the same name as the class in which it is "
14235 return error_mark_node
;
14238 /* Two cases we need to consider when deciding if a class
14239 template is allowed as an elaborated type specifier:
14240 1. It is a self reference to its own class.
14241 2. It comes with a template header.
14245 template <class T> class C {
14246 class C *c1; // DECL_SELF_REFERENCE_P is true
14249 template <class U> class C; // template_header_p is true
14250 template <class T> class C<T>::D {
14251 class C *c2; // DECL_SELF_REFERENCE_P is true
14254 t
= check_elaborated_type_specifier (tag_code
,
14257 | DECL_SELF_REFERENCE_P (decl
));
14258 if (template_header_p
&& t
&& CLASS_TYPE_P (t
)
14259 && (!CLASSTYPE_TEMPLATE_INFO (t
)
14260 || (!PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t
)))))
14262 error ("%qT is not a template", t
);
14263 inform (location_of (t
), "previous declaration here");
14264 if (TYPE_CLASS_SCOPE_P (t
)
14265 && CLASSTYPE_TEMPLATE_INFO (TYPE_CONTEXT (t
)))
14266 inform (input_location
,
14267 "perhaps you want to explicitly add %<%T::%>",
14269 t
= error_mark_node
;
14274 else if (decl
&& TREE_CODE (decl
) == TREE_LIST
)
14276 error ("reference to %qD is ambiguous", name
);
14277 print_candidates (decl
);
14278 return error_mark_node
;
14284 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
14285 Define the tag as a forward-reference if it is not defined.
14287 If a declaration is given, process it here, and report an error if
14288 multiple declarations are not identical.
14290 SCOPE is TS_CURRENT when this is also a definition. Only look in
14291 the current frame for the name (since C++ allows new names in any
14292 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
14293 declaration. Only look beginning from the current scope outward up
14294 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
14296 TEMPLATE_HEADER_P is true when this declaration is preceded by
14297 a set of template parameters. */
14300 xref_tag_1 (enum tag_types tag_code
, tree name
,
14301 tag_scope scope
, bool template_header_p
)
14303 enum tree_code code
;
14304 tree context
= NULL_TREE
;
14306 gcc_assert (identifier_p (name
));
14312 code
= RECORD_TYPE
;
14318 code
= ENUMERAL_TYPE
;
14321 gcc_unreachable ();
14324 /* In case of anonymous name, xref_tag is only called to
14325 make type node and push name. Name lookup is not required. */
14326 tree t
= NULL_TREE
;
14327 if (scope
!= ts_lambda
&& !IDENTIFIER_ANON_P (name
))
14328 t
= lookup_and_check_tag (tag_code
, name
, scope
, template_header_p
);
14330 if (t
== error_mark_node
)
14331 return error_mark_node
;
14333 if (scope
!= ts_current
&& t
&& current_class_type
14334 && template_class_depth (current_class_type
)
14335 && template_header_p
)
14337 if (TREE_CODE (t
) == TEMPLATE_TEMPLATE_PARM
)
14340 /* Since SCOPE is not TS_CURRENT, we are not looking at a
14341 definition of this tag. Since, in addition, we are currently
14342 processing a (member) template declaration of a template
14343 class, we must be very careful; consider:
14345 template <class X> struct S1
14347 template <class U> struct S2
14349 template <class V> friend struct S1;
14352 Here, the S2::S1 declaration should not be confused with the
14353 outer declaration. In particular, the inner version should
14354 have a template parameter of level 2, not level 1.
14356 On the other hand, when presented with:
14358 template <class T> struct S1
14360 template <class U> struct S2 {};
14361 template <class U> friend struct S2;
14364 the friend must find S1::S2 eventually. We accomplish this
14365 by making sure that the new type we create to represent this
14366 declaration has the right TYPE_CONTEXT. */
14367 context
= TYPE_CONTEXT (t
);
14373 /* If no such tag is yet defined, create a forward-reference node
14374 and record it as the "definition".
14375 When a real declaration of this type is found,
14376 the forward-reference will be altered into a real type. */
14377 if (code
== ENUMERAL_TYPE
)
14379 error ("use of enum %q#D without previous declaration", name
);
14380 return error_mark_node
;
14384 t
= make_class_type (code
);
14385 TYPE_CONTEXT (t
) = context
;
14386 if (scope
== ts_lambda
)
14388 /* Mark it as a lambda type. */
14389 CLASSTYPE_LAMBDA_EXPR (t
) = error_mark_node
;
14390 /* And push it into current scope. */
14391 scope
= ts_current
;
14393 t
= pushtag (name
, t
, scope
);
14398 if (template_header_p
&& MAYBE_CLASS_TYPE_P (t
))
14400 /* Check that we aren't trying to overload a class with different
14402 tree constr
= NULL_TREE
;
14403 if (current_template_parms
)
14405 tree reqs
= TEMPLATE_PARMS_CONSTRAINTS (current_template_parms
);
14406 constr
= build_constraints (reqs
, NULL_TREE
);
14408 if (!redeclare_class_template (t
, current_template_parms
, constr
))
14409 return error_mark_node
;
14411 else if (!processing_template_decl
14412 && CLASS_TYPE_P (t
)
14413 && CLASSTYPE_IS_TEMPLATE (t
))
14415 error ("redeclaration of %qT as a non-template", t
);
14416 inform (location_of (t
), "previous declaration %qD", t
);
14417 return error_mark_node
;
14420 if (scope
!= ts_within_enclosing_non_class
&& TYPE_HIDDEN_P (t
))
14422 /* This is no longer an invisible friend. Make it
14424 tree decl
= TYPE_NAME (t
);
14426 DECL_ANTICIPATED (decl
) = false;
14427 DECL_FRIEND_P (decl
) = false;
14429 if (TYPE_TEMPLATE_INFO (t
))
14431 tree tmpl
= TYPE_TI_TEMPLATE (t
);
14432 DECL_ANTICIPATED (tmpl
) = false;
14433 DECL_FRIEND_P (tmpl
) = false;
14441 /* Wrapper for xref_tag_1. */
14444 xref_tag (enum tag_types tag_code
, tree name
,
14445 tag_scope scope
, bool template_header_p
)
14449 subtime
= timevar_cond_start (TV_NAME_LOOKUP
);
14450 ret
= xref_tag_1 (tag_code
, name
, scope
, template_header_p
);
14451 timevar_cond_stop (TV_NAME_LOOKUP
, subtime
);
14457 xref_tag_from_type (tree old
, tree id
, tag_scope scope
)
14459 enum tag_types tag_kind
;
14461 if (TREE_CODE (old
) == RECORD_TYPE
)
14462 tag_kind
= (CLASSTYPE_DECLARED_CLASS (old
) ? class_type
: record_type
);
14464 tag_kind
= union_type
;
14466 if (id
== NULL_TREE
)
14467 id
= TYPE_IDENTIFIER (old
);
14469 return xref_tag (tag_kind
, id
, scope
, false);
14472 /* Create the binfo hierarchy for REF with (possibly NULL) base list
14473 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
14474 access_* node, and the TREE_VALUE is the type of the base-class.
14475 Non-NULL TREE_TYPE indicates virtual inheritance. */
14478 xref_basetypes (tree ref
, tree base_list
)
14481 tree binfo
, base_binfo
;
14482 unsigned max_vbases
= 0; /* Maximum direct & indirect virtual bases. */
14483 unsigned max_bases
= 0; /* Maximum direct bases. */
14484 unsigned max_dvbases
= 0; /* Maximum direct virtual bases. */
14486 tree default_access
;
14487 tree igo_prev
; /* Track Inheritance Graph Order. */
14489 if (ref
== error_mark_node
)
14492 /* The base of a derived class is private by default, all others are
14494 default_access
= (TREE_CODE (ref
) == RECORD_TYPE
14495 && CLASSTYPE_DECLARED_CLASS (ref
)
14496 ? access_private_node
: access_public_node
);
14498 /* First, make sure that any templates in base-classes are
14499 instantiated. This ensures that if we call ourselves recursively
14500 we do not get confused about which classes are marked and which
14502 basep
= &base_list
;
14505 tree basetype
= TREE_VALUE (*basep
);
14507 /* The dependent_type_p call below should really be dependent_scope_p
14508 so that we give a hard error about using an incomplete type as a
14509 base, but we allow it with a pedwarn for backward
14511 if (processing_template_decl
14512 && CLASS_TYPE_P (basetype
) && TYPE_BEING_DEFINED (basetype
))
14513 cxx_incomplete_type_diagnostic (NULL_TREE
, basetype
, DK_PEDWARN
);
14514 if (!dependent_type_p (basetype
)
14515 && !complete_type_or_else (basetype
, NULL
))
14516 /* An incomplete type. Remove it from the list. */
14517 *basep
= TREE_CHAIN (*basep
);
14521 if (TREE_TYPE (*basep
))
14523 if (CLASS_TYPE_P (basetype
))
14524 max_vbases
+= vec_safe_length (CLASSTYPE_VBASECLASSES (basetype
));
14525 basep
= &TREE_CHAIN (*basep
);
14528 max_vbases
+= max_dvbases
;
14530 TYPE_MARKED_P (ref
) = 1;
14532 /* The binfo slot should be empty, unless this is an (ill-formed)
14534 gcc_assert (!TYPE_BINFO (ref
) || TYPE_SIZE (ref
));
14536 gcc_assert (TYPE_MAIN_VARIANT (ref
) == ref
);
14538 binfo
= make_tree_binfo (max_bases
);
14540 TYPE_BINFO (ref
) = binfo
;
14541 BINFO_OFFSET (binfo
) = size_zero_node
;
14542 BINFO_TYPE (binfo
) = ref
;
14544 /* Apply base-class info set up to the variants of this type. */
14545 fixup_type_variants (ref
);
14549 vec_alloc (BINFO_BASE_ACCESSES (binfo
), max_bases
);
14550 /* A C++98 POD cannot have base classes. */
14551 CLASSTYPE_NON_LAYOUT_POD_P (ref
) = true;
14553 if (TREE_CODE (ref
) == UNION_TYPE
)
14555 error ("derived union %qT invalid", ref
);
14561 warning (OPT_Wmultiple_inheritance
,
14562 "%qT defined with multiple direct bases", ref
);
14566 /* An aggregate can't have virtual base classes. */
14567 CLASSTYPE_NON_AGGREGATE (ref
) = true;
14569 vec_alloc (CLASSTYPE_VBASECLASSES (ref
), max_vbases
);
14572 warning (OPT_Wvirtual_inheritance
,
14573 "%qT defined with direct virtual base", ref
);
14576 for (igo_prev
= binfo
; base_list
; base_list
= TREE_CHAIN (base_list
))
14578 tree access
= TREE_PURPOSE (base_list
);
14579 int via_virtual
= TREE_TYPE (base_list
) != NULL_TREE
;
14580 tree basetype
= TREE_VALUE (base_list
);
14582 if (access
== access_default_node
)
14583 access
= default_access
;
14585 /* Before C++17, an aggregate cannot have base classes. In C++17, an
14586 aggregate can't have virtual, private, or protected base classes. */
14587 if (cxx_dialect
< cxx17
14588 || access
!= access_public_node
14590 CLASSTYPE_NON_AGGREGATE (ref
) = true;
14592 if (PACK_EXPANSION_P (basetype
))
14593 basetype
= PACK_EXPANSION_PATTERN (basetype
);
14594 if (TREE_CODE (basetype
) == TYPE_DECL
)
14595 basetype
= TREE_TYPE (basetype
);
14596 if (!MAYBE_CLASS_TYPE_P (basetype
) || TREE_CODE (basetype
) == UNION_TYPE
)
14598 error ("base type %qT fails to be a struct or class type",
14603 base_binfo
= NULL_TREE
;
14604 if (CLASS_TYPE_P (basetype
) && !dependent_scope_p (basetype
))
14606 base_binfo
= TYPE_BINFO (basetype
);
14607 /* The original basetype could have been a typedef'd type. */
14608 basetype
= BINFO_TYPE (base_binfo
);
14610 /* Inherit flags from the base. */
14611 TYPE_HAS_NEW_OPERATOR (ref
)
14612 |= TYPE_HAS_NEW_OPERATOR (basetype
);
14613 TYPE_HAS_ARRAY_NEW_OPERATOR (ref
)
14614 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype
);
14615 TYPE_GETS_DELETE (ref
) |= TYPE_GETS_DELETE (basetype
);
14616 TYPE_HAS_CONVERSION (ref
) |= TYPE_HAS_CONVERSION (basetype
);
14617 CLASSTYPE_DIAMOND_SHAPED_P (ref
)
14618 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype
);
14619 CLASSTYPE_REPEATED_BASE_P (ref
)
14620 |= CLASSTYPE_REPEATED_BASE_P (basetype
);
14623 /* We must do this test after we've seen through a typedef
14625 if (TYPE_MARKED_P (basetype
))
14627 if (basetype
== ref
)
14628 error ("recursive type %qT undefined", basetype
);
14630 error ("duplicate base type %qT invalid", basetype
);
14634 if (PACK_EXPANSION_P (TREE_VALUE (base_list
)))
14635 /* Regenerate the pack expansion for the bases. */
14636 basetype
= make_pack_expansion (basetype
);
14638 TYPE_MARKED_P (basetype
) = 1;
14640 base_binfo
= copy_binfo (base_binfo
, basetype
, ref
,
14641 &igo_prev
, via_virtual
);
14642 if (!BINFO_INHERITANCE_CHAIN (base_binfo
))
14643 BINFO_INHERITANCE_CHAIN (base_binfo
) = binfo
;
14645 BINFO_BASE_APPEND (binfo
, base_binfo
);
14646 BINFO_BASE_ACCESS_APPEND (binfo
, access
);
14650 /* Update max_vbases to reflect the reality that we are dropping
14651 this base: if it reaches zero we want to undo the vec_alloc
14652 above to avoid inconsistencies during error-recovery: eg, in
14653 build_special_member_call, CLASSTYPE_VBASECLASSES non null
14654 and vtt null (c++/27952). */
14657 if (CLASS_TYPE_P (basetype
))
14659 -= vec_safe_length (CLASSTYPE_VBASECLASSES (basetype
));
14662 if (CLASSTYPE_VBASECLASSES (ref
)
14663 && max_vbases
== 0)
14664 vec_free (CLASSTYPE_VBASECLASSES (ref
));
14666 if (vec_safe_length (CLASSTYPE_VBASECLASSES (ref
)) < max_vbases
)
14667 /* If we didn't get max_vbases vbases, we must have shared at
14668 least one of them, and are therefore diamond shaped. */
14669 CLASSTYPE_DIAMOND_SHAPED_P (ref
) = 1;
14671 /* Unmark all the types. */
14672 for (i
= 0; BINFO_BASE_ITERATE (binfo
, i
, base_binfo
); i
++)
14673 TYPE_MARKED_P (BINFO_TYPE (base_binfo
)) = 0;
14674 TYPE_MARKED_P (ref
) = 0;
14676 /* Now see if we have a repeated base type. */
14677 if (!CLASSTYPE_REPEATED_BASE_P (ref
))
14679 for (base_binfo
= binfo
; base_binfo
;
14680 base_binfo
= TREE_CHAIN (base_binfo
))
14682 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo
)))
14684 CLASSTYPE_REPEATED_BASE_P (ref
) = 1;
14687 TYPE_MARKED_P (BINFO_TYPE (base_binfo
)) = 1;
14689 for (base_binfo
= binfo
; base_binfo
;
14690 base_binfo
= TREE_CHAIN (base_binfo
))
14691 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo
)))
14692 TYPE_MARKED_P (BINFO_TYPE (base_binfo
)) = 0;
14699 /* Copies the enum-related properties from type SRC to type DST.
14700 Used with the underlying type of an enum and the enum itself. */
14702 copy_type_enum (tree dst
, tree src
)
14705 for (t
= dst
; t
; t
= TYPE_NEXT_VARIANT (t
))
14707 TYPE_MIN_VALUE (t
) = TYPE_MIN_VALUE (src
);
14708 TYPE_MAX_VALUE (t
) = TYPE_MAX_VALUE (src
);
14709 TYPE_SIZE (t
) = TYPE_SIZE (src
);
14710 TYPE_SIZE_UNIT (t
) = TYPE_SIZE_UNIT (src
);
14711 SET_TYPE_MODE (dst
, TYPE_MODE (src
));
14712 TYPE_PRECISION (t
) = TYPE_PRECISION (src
);
14713 unsigned valign
= TYPE_ALIGN (src
);
14714 if (TYPE_USER_ALIGN (t
))
14715 valign
= MAX (valign
, TYPE_ALIGN (t
));
14717 TYPE_USER_ALIGN (t
) = TYPE_USER_ALIGN (src
);
14718 SET_TYPE_ALIGN (t
, valign
);
14719 TYPE_UNSIGNED (t
) = TYPE_UNSIGNED (src
);
14723 /* Begin compiling the definition of an enumeration type.
14726 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
14728 UNDERLYING_TYPE is the type that will be used as the storage for
14729 the enumeration type. This should be NULL_TREE if no storage type
14732 ATTRIBUTES are any attributes specified after the enum-key.
14734 SCOPED_ENUM_P is true if this is a scoped enumeration type.
14736 if IS_NEW is not NULL, gets TRUE iff a new type is created.
14738 Returns the type object, as yet incomplete.
14739 Also records info about it so that build_enumerator
14740 may be used to declare the individual values as they are read. */
14743 start_enum (tree name
, tree enumtype
, tree underlying_type
,
14744 tree attributes
, bool scoped_enum_p
, bool *is_new
)
14746 tree prevtype
= NULL_TREE
;
14747 gcc_assert (identifier_p (name
));
14751 /* [C++0x dcl.enum]p5:
14753 If not explicitly specified, the underlying type of a scoped
14754 enumeration type is int. */
14755 if (!underlying_type
&& scoped_enum_p
)
14756 underlying_type
= integer_type_node
;
14758 if (underlying_type
)
14759 underlying_type
= cv_unqualified (underlying_type
);
14761 /* If this is the real definition for a previous forward reference,
14762 fill in the contents in the same object that used to be the
14763 forward reference. */
14765 enumtype
= lookup_and_check_tag (enum_type
, name
,
14766 /*tag_scope=*/ts_current
,
14767 /*template_header_p=*/false);
14769 /* In case of a template_decl, the only check that should be deferred
14770 to instantiation time is the comparison of underlying types. */
14771 if (enumtype
&& TREE_CODE (enumtype
) == ENUMERAL_TYPE
)
14773 if (scoped_enum_p
!= SCOPED_ENUM_P (enumtype
))
14775 error_at (input_location
, "scoped/unscoped mismatch "
14776 "in enum %q#T", enumtype
);
14777 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype
)),
14778 "previous definition here");
14779 enumtype
= error_mark_node
;
14781 else if (ENUM_FIXED_UNDERLYING_TYPE_P (enumtype
) != !! underlying_type
)
14783 error_at (input_location
, "underlying type mismatch "
14784 "in enum %q#T", enumtype
);
14785 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype
)),
14786 "previous definition here");
14787 enumtype
= error_mark_node
;
14789 else if (underlying_type
&& ENUM_UNDERLYING_TYPE (enumtype
)
14790 && !same_type_p (underlying_type
,
14791 ENUM_UNDERLYING_TYPE (enumtype
)))
14793 error_at (input_location
, "different underlying type "
14794 "in enum %q#T", enumtype
);
14795 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype
)),
14796 "previous definition here");
14797 underlying_type
= NULL_TREE
;
14801 if (!enumtype
|| TREE_CODE (enumtype
) != ENUMERAL_TYPE
14802 || processing_template_decl
)
14804 /* In case of error, make a dummy enum to allow parsing to
14806 if (enumtype
== error_mark_node
)
14808 name
= make_anon_name ();
14809 enumtype
= NULL_TREE
;
14812 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
14813 of an opaque enum, or an opaque enum of an already defined
14814 enumeration (C++11).
14815 In any other case, it'll be NULL_TREE. */
14821 prevtype
= enumtype
;
14823 /* Do not push the decl more than once. */
14825 || TREE_CODE (enumtype
) != ENUMERAL_TYPE
)
14827 enumtype
= cxx_make_type (ENUMERAL_TYPE
);
14828 enumtype
= pushtag (name
, enumtype
, /*tag_scope=*/ts_current
);
14830 /* std::byte aliases anything. */
14831 if (enumtype
!= error_mark_node
14832 && TYPE_CONTEXT (enumtype
) == std_node
14833 && !strcmp ("byte", TYPE_NAME_STRING (enumtype
)))
14834 TYPE_ALIAS_SET (enumtype
) = 0;
14837 enumtype
= xref_tag (enum_type
, name
, /*tag_scope=*/ts_current
,
14840 if (enumtype
== error_mark_node
)
14841 return error_mark_node
;
14843 /* The enum is considered opaque until the opening '{' of the
14844 enumerator list. */
14845 SET_OPAQUE_ENUM_P (enumtype
, true);
14846 ENUM_FIXED_UNDERLYING_TYPE_P (enumtype
) = !! underlying_type
;
14849 SET_SCOPED_ENUM_P (enumtype
, scoped_enum_p
);
14851 cplus_decl_attributes (&enumtype
, attributes
, (int)ATTR_FLAG_TYPE_IN_PLACE
);
14853 if (underlying_type
)
14855 if (ENUM_UNDERLYING_TYPE (enumtype
))
14856 /* We already checked that it matches, don't change it to a different
14857 typedef variant. */;
14858 else if (CP_INTEGRAL_TYPE_P (underlying_type
))
14860 copy_type_enum (enumtype
, underlying_type
);
14861 ENUM_UNDERLYING_TYPE (enumtype
) = underlying_type
;
14863 else if (dependent_type_p (underlying_type
))
14864 ENUM_UNDERLYING_TYPE (enumtype
) = underlying_type
;
14866 error ("underlying type %qT of %qT must be an integral type",
14867 underlying_type
, enumtype
);
14870 /* If into a template class, the returned enum is always the first
14871 declaration (opaque or not) seen. This way all the references to
14872 this type will be to the same declaration. The following ones are used
14873 only to check for definition errors. */
14874 if (prevtype
&& processing_template_decl
)
14880 /* After processing and defining all the values of an enumeration type,
14881 install their decls in the enumeration type.
14882 ENUMTYPE is the type object. */
14885 finish_enum_value_list (tree enumtype
)
14888 tree underlying_type
;
14891 tree minnode
, maxnode
;
14894 bool fixed_underlying_type_p
14895 = ENUM_UNDERLYING_TYPE (enumtype
) != NULL_TREE
;
14897 /* We built up the VALUES in reverse order. */
14898 TYPE_VALUES (enumtype
) = nreverse (TYPE_VALUES (enumtype
));
14900 /* For an enum defined in a template, just set the type of the values;
14901 all further processing is postponed until the template is
14902 instantiated. We need to set the type so that tsubst of a CONST_DECL
14904 if (processing_template_decl
)
14906 for (values
= TYPE_VALUES (enumtype
);
14908 values
= TREE_CHAIN (values
))
14909 TREE_TYPE (TREE_VALUE (values
)) = enumtype
;
14913 /* Determine the minimum and maximum values of the enumerators. */
14914 if (TYPE_VALUES (enumtype
))
14916 minnode
= maxnode
= NULL_TREE
;
14918 for (values
= TYPE_VALUES (enumtype
);
14920 values
= TREE_CHAIN (values
))
14922 decl
= TREE_VALUE (values
);
14924 /* [dcl.enum]: Following the closing brace of an enum-specifier,
14925 each enumerator has the type of its enumeration. Prior to the
14926 closing brace, the type of each enumerator is the type of its
14927 initializing value. */
14928 TREE_TYPE (decl
) = enumtype
;
14930 /* Update the minimum and maximum values, if appropriate. */
14931 value
= DECL_INITIAL (decl
);
14932 if (value
== error_mark_node
)
14933 value
= integer_zero_node
;
14934 /* Figure out what the minimum and maximum values of the
14935 enumerators are. */
14937 minnode
= maxnode
= value
;
14938 else if (tree_int_cst_lt (maxnode
, value
))
14940 else if (tree_int_cst_lt (value
, minnode
))
14947 If the enumerator-list is empty, the underlying type is as if
14948 the enumeration had a single enumerator with value 0. */
14949 minnode
= maxnode
= integer_zero_node
;
14951 if (!fixed_underlying_type_p
)
14953 /* Compute the number of bits require to represent all values of the
14954 enumeration. We must do this before the type of MINNODE and
14955 MAXNODE are transformed, since tree_int_cst_min_precision relies
14956 on the TREE_TYPE of the value it is passed. */
14957 signop sgn
= tree_int_cst_sgn (minnode
) >= 0 ? UNSIGNED
: SIGNED
;
14958 int lowprec
= tree_int_cst_min_precision (minnode
, sgn
);
14959 int highprec
= tree_int_cst_min_precision (maxnode
, sgn
);
14960 int precision
= MAX (lowprec
, highprec
);
14962 bool use_short_enum
;
14964 /* Determine the underlying type of the enumeration.
14968 The underlying type of an enumeration is an integral type that
14969 can represent all the enumerator values defined in the
14970 enumeration. It is implementation-defined which integral type is
14971 used as the underlying type for an enumeration except that the
14972 underlying type shall not be larger than int unless the value of
14973 an enumerator cannot fit in an int or unsigned int.
14975 We use "int" or an "unsigned int" as the underlying type, even if
14976 a smaller integral type would work, unless the user has
14977 explicitly requested that we use the smallest possible type. The
14978 user can request that for all enumerations with a command line
14979 flag, or for just one enumeration with an attribute. */
14981 use_short_enum
= flag_short_enums
14982 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype
));
14984 /* If the precision of the type was specified with an attribute and it
14985 was too small, give an error. Otherwise, use it. */
14986 if (TYPE_PRECISION (enumtype
))
14988 if (precision
> TYPE_PRECISION (enumtype
))
14989 error ("specified mode too small for enumerated values");
14992 use_short_enum
= true;
14993 precision
= TYPE_PRECISION (enumtype
);
14997 for (itk
= (use_short_enum
? itk_char
: itk_int
);
15001 underlying_type
= integer_types
[itk
];
15002 if (underlying_type
!= NULL_TREE
15003 && TYPE_PRECISION (underlying_type
) >= precision
15004 && TYPE_SIGN (underlying_type
) == sgn
)
15007 if (itk
== itk_none
)
15011 IF no integral type can represent all the enumerator values, the
15012 enumeration is ill-formed. */
15013 error ("no integral type can represent all of the enumerator values "
15014 "for %qT", enumtype
);
15015 precision
= TYPE_PRECISION (long_long_integer_type_node
);
15016 underlying_type
= integer_types
[itk_unsigned_long_long
];
15021 The value of sizeof() applied to an enumeration type, an object
15022 of an enumeration type, or an enumerator, is the value of sizeof()
15023 applied to the underlying type. */
15024 copy_type_enum (enumtype
, underlying_type
);
15026 /* Compute the minimum and maximum values for the type.
15030 For an enumeration where emin is the smallest enumerator and emax
15031 is the largest, the values of the enumeration are the values of the
15032 underlying type in the range bmin to bmax, where bmin and bmax are,
15033 respectively, the smallest and largest values of the smallest bit-
15034 field that can store emin and emax. */
15036 /* The middle-end currently assumes that types with TYPE_PRECISION
15037 narrower than their underlying type are suitably zero or sign
15038 extended to fill their mode. Similarly, it assumes that the front
15039 end assures that a value of a particular type must be within
15040 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
15042 We used to set these fields based on bmin and bmax, but that led
15043 to invalid assumptions like optimizing away bounds checking. So
15044 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
15045 TYPE_MAX_VALUE to the values for the mode above and only restrict
15046 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
15047 ENUM_UNDERLYING_TYPE (enumtype
)
15048 = build_distinct_type_copy (underlying_type
);
15049 TYPE_PRECISION (ENUM_UNDERLYING_TYPE (enumtype
)) = precision
;
15050 set_min_and_max_values_for_integral_type
15051 (ENUM_UNDERLYING_TYPE (enumtype
), precision
, sgn
);
15053 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
15054 if (flag_strict_enums
)
15055 set_min_and_max_values_for_integral_type (enumtype
, precision
, sgn
);
15058 underlying_type
= ENUM_UNDERLYING_TYPE (enumtype
);
15060 /* Convert each of the enumerators to the type of the underlying
15061 type of the enumeration. */
15062 for (values
= TYPE_VALUES (enumtype
); values
; values
= TREE_CHAIN (values
))
15064 location_t saved_location
;
15066 decl
= TREE_VALUE (values
);
15067 saved_location
= input_location
;
15068 input_location
= DECL_SOURCE_LOCATION (decl
);
15069 if (fixed_underlying_type_p
)
15070 /* If the enumeration type has a fixed underlying type, we
15071 already checked all of the enumerator values. */
15072 value
= DECL_INITIAL (decl
);
15074 value
= perform_implicit_conversion (underlying_type
,
15075 DECL_INITIAL (decl
),
15076 tf_warning_or_error
);
15077 input_location
= saved_location
;
15079 /* Do not clobber shared ints. */
15080 if (value
!= error_mark_node
)
15082 value
= copy_node (value
);
15084 TREE_TYPE (value
) = enumtype
;
15086 DECL_INITIAL (decl
) = value
;
15089 /* Fix up all variant types of this enum type. */
15090 for (t
= TYPE_MAIN_VARIANT (enumtype
); t
; t
= TYPE_NEXT_VARIANT (t
))
15091 TYPE_VALUES (t
) = TYPE_VALUES (enumtype
);
15093 if (at_class_scope_p ()
15094 && COMPLETE_TYPE_P (current_class_type
)
15095 && UNSCOPED_ENUM_P (enumtype
))
15097 insert_late_enum_def_bindings (current_class_type
, enumtype
);
15098 /* TYPE_FIELDS needs fixup. */
15099 fixup_type_variants (current_class_type
);
15102 /* Finish debugging output for this type. */
15103 rest_of_type_compilation (enumtype
, namespace_bindings_p ());
15105 /* Each enumerator now has the type of its enumeration. Clear the cache
15106 so that this change in types doesn't confuse us later on. */
15107 clear_cv_and_fold_caches ();
15110 /* Finishes the enum type. This is called only the first time an
15111 enumeration is seen, be it opaque or odinary.
15112 ENUMTYPE is the type object. */
15115 finish_enum (tree enumtype
)
15117 if (processing_template_decl
)
15119 if (at_function_scope_p ())
15120 add_stmt (build_min (TAG_DEFN
, enumtype
));
15124 /* If this is a forward declaration, there should not be any variants,
15125 though we can get a variant in the middle of an enum-specifier with
15126 wacky code like 'enum E { e = sizeof(const E*) };' */
15127 gcc_assert (enumtype
== TYPE_MAIN_VARIANT (enumtype
)
15128 && (TYPE_VALUES (enumtype
)
15129 || !TYPE_NEXT_VARIANT (enumtype
)));
15132 /* Build and install a CONST_DECL for an enumeration constant of the
15133 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
15134 Apply ATTRIBUTES if available. LOC is the location of NAME.
15135 Assignment of sequential values by default is handled here. */
15138 build_enumerator (tree name
, tree value
, tree enumtype
, tree attributes
,
15145 /* scalar_constant_value will pull out this expression, so make sure
15146 it's folded as appropriate. */
15147 if (processing_template_decl
)
15148 value
= fold_non_dependent_expr (value
);
15150 /* If the VALUE was erroneous, pretend it wasn't there; that will
15151 result in the enum being assigned the next value in sequence. */
15152 if (value
== error_mark_node
)
15155 /* Remove no-op casts from the value. */
15157 STRIP_TYPE_NOPS (value
);
15159 if (! processing_template_decl
)
15161 /* Validate and default VALUE. */
15162 if (value
!= NULL_TREE
)
15164 if (!ENUM_UNDERLYING_TYPE (enumtype
))
15166 tree tmp_value
= build_expr_type_conversion (WANT_INT
| WANT_ENUM
,
15171 else if (! INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P
15172 (TREE_TYPE (value
)))
15173 value
= perform_implicit_conversion_flags
15174 (ENUM_UNDERLYING_TYPE (enumtype
), value
, tf_warning_or_error
,
15175 LOOKUP_IMPLICIT
| LOOKUP_NO_NARROWING
);
15177 if (value
== error_mark_node
)
15180 if (value
!= NULL_TREE
)
15182 if (! INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P
15183 (TREE_TYPE (value
)))
15185 error_at (cp_expr_loc_or_input_loc (value
),
15186 "enumerator value for %qD must have integral or "
15187 "unscoped enumeration type", name
);
15192 value
= cxx_constant_value (value
);
15194 if (TREE_CODE (value
) != INTEGER_CST
)
15196 error ("enumerator value for %qD is not an integer "
15204 /* Default based on previous value. */
15205 if (value
== NULL_TREE
)
15207 if (TYPE_VALUES (enumtype
))
15211 /* C++03 7.2/4: If no initializer is specified for the first
15212 enumerator, the type is an unspecified integral
15213 type. Otherwise the type is the same as the type of the
15214 initializing value of the preceding enumerator unless the
15215 incremented value is not representable in that type, in
15216 which case the type is an unspecified integral type
15217 sufficient to contain the incremented value. */
15218 prev_value
= DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype
)));
15219 if (error_operand_p (prev_value
))
15220 value
= error_mark_node
;
15223 wi::overflow_type overflowed
;
15224 tree type
= TREE_TYPE (prev_value
);
15225 signop sgn
= TYPE_SIGN (type
);
15226 widest_int wi
= wi::add (wi::to_widest (prev_value
), 1, sgn
,
15230 bool pos
= !wi::neg_p (wi
, sgn
);
15231 if (!wi::fits_to_tree_p (wi
, type
))
15234 for (itk
= itk_int
; itk
!= itk_none
; itk
++)
15236 type
= integer_types
[itk
];
15237 if (type
!= NULL_TREE
15238 && (pos
|| !TYPE_UNSIGNED (type
))
15239 && wi::fits_to_tree_p (wi
, type
))
15242 if (type
&& cxx_dialect
< cxx11
15243 && itk
> itk_unsigned_long
)
15244 pedwarn (input_location
, OPT_Wlong_long
,
15246 incremented enumerator value is too large for %<unsigned long%>") : G_("\
15247 incremented enumerator value is too large for %<long%>"));
15249 if (type
== NULL_TREE
)
15250 overflowed
= wi::OVF_UNKNOWN
;
15252 value
= wide_int_to_tree (type
, wi
);
15257 error ("overflow in enumeration values at %qD", name
);
15258 value
= error_mark_node
;
15263 value
= integer_zero_node
;
15266 /* Remove no-op casts from the value. */
15267 STRIP_TYPE_NOPS (value
);
15269 /* If the underlying type of the enum is fixed, check whether
15270 the enumerator values fits in the underlying type. If it
15271 does not fit, the program is ill-formed [C++0x dcl.enum]. */
15272 if (ENUM_UNDERLYING_TYPE (enumtype
)
15274 && TREE_CODE (value
) == INTEGER_CST
)
15276 if (!int_fits_type_p (value
, ENUM_UNDERLYING_TYPE (enumtype
)))
15277 error ("enumerator value %qE is outside the range of underlying "
15278 "type %qT", value
, ENUM_UNDERLYING_TYPE (enumtype
));
15280 /* Convert the value to the appropriate type. */
15281 value
= fold_convert (ENUM_UNDERLYING_TYPE (enumtype
), value
);
15285 /* C++ associates enums with global, function, or class declarations. */
15286 context
= current_scope ();
15288 /* Build the actual enumeration constant. Note that the enumeration
15289 constants have the underlying type of the enum (if it is fixed)
15290 or the type of their initializer (if the underlying type of the
15291 enum is not fixed):
15295 If the underlying type is fixed, the type of each enumerator
15296 prior to the closing brace is the underlying type; if the
15297 initializing value of an enumerator cannot be represented by
15298 the underlying type, the program is ill-formed. If the
15299 underlying type is not fixed, the type of each enumerator is
15300 the type of its initializing value.
15302 If the underlying type is not fixed, it will be computed by
15303 finish_enum and we will reset the type of this enumerator. Of
15304 course, if we're processing a template, there may be no value. */
15305 type
= value
? TREE_TYPE (value
) : NULL_TREE
;
15307 decl
= build_decl (loc
, CONST_DECL
, name
, type
);
15309 DECL_CONTEXT (decl
) = enumtype
;
15310 TREE_CONSTANT (decl
) = 1;
15311 TREE_READONLY (decl
) = 1;
15312 DECL_INITIAL (decl
) = value
;
15315 cplus_decl_attributes (&decl
, attributes
, 0);
15317 if (context
&& context
== current_class_type
&& !SCOPED_ENUM_P (enumtype
))
15319 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
15320 on the TYPE_FIELDS list for `S'. (That's so that you can say
15321 things like `S::i' later.) */
15323 /* The enumerator may be getting declared outside of its enclosing
15326 class S { public: enum E : int; }; enum S::E : int { i = 7; };
15328 For which case we need to make sure that the access of `S::i'
15329 matches the access of `S::E'. */
15330 tree saved_cas
= current_access_specifier
;
15331 if (TREE_PRIVATE (TYPE_NAME (enumtype
)))
15332 current_access_specifier
= access_private_node
;
15333 else if (TREE_PROTECTED (TYPE_NAME (enumtype
)))
15334 current_access_specifier
= access_protected_node
;
15336 current_access_specifier
= access_public_node
;
15338 finish_member_declaration (decl
);
15340 current_access_specifier
= saved_cas
;
15345 /* Add this enumeration constant to the list for this type. */
15346 TYPE_VALUES (enumtype
) = tree_cons (name
, decl
, TYPE_VALUES (enumtype
));
15349 /* Look for an enumerator with the given NAME within the enumeration
15350 type ENUMTYPE. This routine is used primarily for qualified name
15351 lookup into an enumerator in C++0x, e.g.,
15353 enum class Color { Red, Green, Blue };
15355 Color color = Color::Red;
15357 Returns the value corresponding to the enumerator, or
15358 NULL_TREE if no such enumerator was found. */
15360 lookup_enumerator (tree enumtype
, tree name
)
15363 gcc_assert (enumtype
&& TREE_CODE (enumtype
) == ENUMERAL_TYPE
);
15365 e
= purpose_member (name
, TYPE_VALUES (enumtype
));
15366 return e
? TREE_VALUE (e
) : NULL_TREE
;
15370 /* We're defining DECL. Make sure that its type is OK. */
15373 check_function_type (tree decl
, tree current_function_parms
)
15375 tree fntype
= TREE_TYPE (decl
);
15376 tree return_type
= complete_type (TREE_TYPE (fntype
));
15378 /* In a function definition, arg types must be complete. */
15379 require_complete_types_for_parms (current_function_parms
);
15381 if (dependent_type_p (return_type
)
15382 || type_uses_auto (return_type
))
15384 if (!COMPLETE_OR_VOID_TYPE_P (return_type
))
15386 tree args
= TYPE_ARG_TYPES (fntype
);
15388 error ("return type %q#T is incomplete", return_type
);
15390 /* Make it return void instead. */
15391 if (TREE_CODE (fntype
) == METHOD_TYPE
)
15392 fntype
= build_method_type_directly (TREE_TYPE (TREE_VALUE (args
)),
15394 TREE_CHAIN (args
));
15396 fntype
= build_function_type (void_type_node
, args
);
15397 fntype
= (cp_build_type_attribute_variant
15398 (fntype
, TYPE_ATTRIBUTES (TREE_TYPE (decl
))));
15399 fntype
= cxx_copy_lang_qualifiers (fntype
, TREE_TYPE (decl
));
15400 TREE_TYPE (decl
) = fntype
;
15404 abstract_virtuals_error (decl
, TREE_TYPE (fntype
));
15405 maybe_warn_parm_abi (TREE_TYPE (fntype
),
15406 DECL_SOURCE_LOCATION (decl
));
15410 /* True iff FN is an implicitly-defined default constructor. */
15413 implicit_default_ctor_p (tree fn
)
15415 return (DECL_CONSTRUCTOR_P (fn
)
15416 && !user_provided_p (fn
)
15417 && sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (fn
)));
15420 /* Clobber the contents of *this to let the back end know that the object
15421 storage is dead when we enter the constructor or leave the destructor. */
15424 build_clobber_this ()
15426 /* Clobbering an empty base is pointless, and harmful if its one byte
15427 TYPE_SIZE overlays real data. */
15428 if (is_empty_class (current_class_type
))
15431 /* If we have virtual bases, clobber the whole object, but only if we're in
15432 charge. If we don't have virtual bases, clobber the as-base type so we
15433 don't mess with tail padding. */
15434 bool vbases
= CLASSTYPE_VBASECLASSES (current_class_type
);
15436 tree ctype
= current_class_type
;
15438 ctype
= CLASSTYPE_AS_BASE (ctype
);
15440 tree clobber
= build_clobber (ctype
);
15442 tree thisref
= current_class_ref
;
15443 if (ctype
!= current_class_type
)
15445 thisref
= build_nop (build_reference_type (ctype
), current_class_ptr
);
15446 thisref
= convert_from_reference (thisref
);
15449 tree exprstmt
= build2 (MODIFY_EXPR
, void_type_node
, thisref
, clobber
);
15451 exprstmt
= build_if_in_charge (exprstmt
);
15456 /* Create the FUNCTION_DECL for a function definition.
15457 DECLSPECS and DECLARATOR are the parts of the declaration;
15458 they describe the function's name and the type it returns,
15459 but twisted together in a fashion that parallels the syntax of C.
15461 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
15462 DECLARATOR is really the DECL for the function we are about to
15463 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
15464 indicating that the function is an inline defined in-class.
15466 This function creates a binding context for the function body
15467 as well as setting up the FUNCTION_DECL in current_function_decl.
15469 For C++, we must first check whether that datum makes any sense.
15470 For example, "class A local_a(1,2);" means that variable local_a
15471 is an aggregate of type A, which should have a constructor
15472 applied to it with the argument list [1, 2].
15474 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
15475 or may be a BLOCK if the function has been defined previously
15476 in this translation unit. On exit, DECL_INITIAL (decl1) will be
15477 error_mark_node if the function has never been defined, or
15478 a BLOCK if the function has been defined somewhere. */
15481 start_preparsed_function (tree decl1
, tree attrs
, int flags
)
15483 tree ctype
= NULL_TREE
;
15486 int doing_friend
= 0;
15487 cp_binding_level
*bl
;
15488 tree current_function_parms
;
15489 struct c_fileinfo
*finfo
15490 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1
)));
15491 bool honor_interface
;
15493 /* Sanity check. */
15494 gcc_assert (VOID_TYPE_P (TREE_VALUE (void_list_node
)));
15495 gcc_assert (TREE_CHAIN (void_list_node
) == NULL_TREE
);
15497 fntype
= TREE_TYPE (decl1
);
15498 if (TREE_CODE (fntype
) == METHOD_TYPE
)
15499 ctype
= TYPE_METHOD_BASETYPE (fntype
);
15501 /* ISO C++ 11.4/5. A friend function defined in a class is in
15502 the (lexical) scope of the class in which it is defined. */
15503 if (!ctype
&& DECL_FRIEND_P (decl1
))
15505 ctype
= DECL_FRIEND_CONTEXT (decl1
);
15507 /* CTYPE could be null here if we're dealing with a template;
15508 for example, `inline friend float foo()' inside a template
15509 will have no CTYPE set. */
15510 if (ctype
&& TREE_CODE (ctype
) != RECORD_TYPE
)
15516 if (DECL_DECLARED_INLINE_P (decl1
)
15517 && lookup_attribute ("noinline", attrs
))
15518 warning_at (DECL_SOURCE_LOCATION (decl1
), 0,
15519 "inline function %qD given attribute %qs", decl1
, "noinline");
15521 /* Handle gnu_inline attribute. */
15522 if (GNU_INLINE_P (decl1
))
15524 DECL_EXTERNAL (decl1
) = 1;
15525 DECL_NOT_REALLY_EXTERN (decl1
) = 0;
15526 DECL_INTERFACE_KNOWN (decl1
) = 1;
15527 DECL_DISREGARD_INLINE_LIMITS (decl1
) = 1;
15530 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1
))
15531 /* This is a constructor, we must ensure that any default args
15532 introduced by this definition are propagated to the clones
15533 now. The clones are used directly in overload resolution. */
15534 adjust_clone_args (decl1
);
15536 /* Sometimes we don't notice that a function is a static member, and
15537 build a METHOD_TYPE for it. Fix that up now. */
15538 gcc_assert (!(ctype
!= NULL_TREE
&& DECL_STATIC_FUNCTION_P (decl1
)
15539 && TREE_CODE (TREE_TYPE (decl1
)) == METHOD_TYPE
));
15541 /* Set up current_class_type, and enter the scope of the class, if
15544 push_nested_class (ctype
);
15545 else if (DECL_STATIC_FUNCTION_P (decl1
))
15546 push_nested_class (DECL_CONTEXT (decl1
));
15548 /* Now that we have entered the scope of the class, we must restore
15549 the bindings for any template parameters surrounding DECL1, if it
15550 is an inline member template. (Order is important; consider the
15551 case where a template parameter has the same name as a field of
15552 the class.) It is not until after this point that
15553 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
15554 if (flags
& SF_INCLASS_INLINE
)
15555 maybe_begin_member_template_processing (decl1
);
15557 /* Effective C++ rule 15. */
15559 && DECL_ASSIGNMENT_OPERATOR_P (decl1
)
15560 && DECL_OVERLOADED_OPERATOR_IS (decl1
, NOP_EXPR
)
15561 && VOID_TYPE_P (TREE_TYPE (fntype
)))
15562 warning (OPT_Weffc__
,
15563 "%<operator=%> should return a reference to %<*this%>");
15565 /* Make the init_value nonzero so pushdecl knows this is not tentative.
15566 error_mark_node is replaced below (in poplevel) with the BLOCK. */
15567 if (!DECL_INITIAL (decl1
))
15568 DECL_INITIAL (decl1
) = error_mark_node
;
15570 /* This function exists in static storage.
15571 (This does not mean `static' in the C sense!) */
15572 TREE_STATIC (decl1
) = 1;
15574 /* We must call push_template_decl after current_class_type is set
15575 up. (If we are processing inline definitions after exiting a
15576 class scope, current_class_type will be NULL_TREE until set above
15577 by push_nested_class.) */
15578 if (processing_template_decl
)
15580 tree newdecl1
= push_template_decl (decl1
);
15581 if (newdecl1
== error_mark_node
)
15583 if (ctype
|| DECL_STATIC_FUNCTION_P (decl1
))
15584 pop_nested_class ();
15590 /* Make sure the parameter and return types are reasonable. When
15591 you declare a function, these types can be incomplete, but they
15592 must be complete when you define the function. */
15593 check_function_type (decl1
, DECL_ARGUMENTS (decl1
));
15595 /* Build the return declaration for the function. */
15596 restype
= TREE_TYPE (fntype
);
15598 if (DECL_RESULT (decl1
) == NULL_TREE
)
15602 resdecl
= build_decl (input_location
, RESULT_DECL
, 0, restype
);
15603 DECL_ARTIFICIAL (resdecl
) = 1;
15604 DECL_IGNORED_P (resdecl
) = 1;
15605 DECL_RESULT (decl1
) = resdecl
;
15607 cp_apply_type_quals_to_decl (cp_type_quals (restype
), resdecl
);
15610 /* Record the decl so that the function name is defined.
15611 If we already have a decl for this name, and it is a FUNCTION_DECL,
15612 use the old decl. */
15613 if (!processing_template_decl
&& !(flags
& SF_PRE_PARSED
))
15615 /* A specialization is not used to guide overload resolution. */
15616 if (!DECL_FUNCTION_MEMBER_P (decl1
)
15617 && !(DECL_USE_TEMPLATE (decl1
) &&
15618 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1
))))
15620 tree olddecl
= pushdecl (decl1
);
15622 if (olddecl
== error_mark_node
)
15623 /* If something went wrong when registering the declaration,
15624 use DECL1; we have to have a FUNCTION_DECL to use when
15625 parsing the body of the function. */
15629 /* Otherwise, OLDDECL is either a previous declaration
15630 of the same function or DECL1 itself. */
15632 if (warn_missing_declarations
15633 && olddecl
== decl1
15634 && !DECL_MAIN_P (decl1
)
15635 && TREE_PUBLIC (decl1
)
15636 && !DECL_DECLARED_INLINE_P (decl1
))
15640 /* Check whether DECL1 is in an anonymous
15642 for (context
= DECL_CONTEXT (decl1
);
15644 context
= DECL_CONTEXT (context
))
15646 if (TREE_CODE (context
) == NAMESPACE_DECL
15647 && DECL_NAME (context
) == NULL_TREE
)
15651 if (context
== NULL
)
15652 warning_at (DECL_SOURCE_LOCATION (decl1
),
15653 OPT_Wmissing_declarations
,
15654 "no previous declaration for %qD", decl1
);
15662 /* We need to set the DECL_CONTEXT. */
15663 if (!DECL_CONTEXT (decl1
) && DECL_TEMPLATE_INFO (decl1
))
15664 DECL_CONTEXT (decl1
) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1
));
15666 fntype
= TREE_TYPE (decl1
);
15667 restype
= TREE_TYPE (fntype
);
15669 /* If #pragma weak applies, mark the decl appropriately now.
15670 The pragma only applies to global functions. Because
15671 determining whether or not the #pragma applies involves
15672 computing the mangled name for the declaration, we cannot
15673 apply the pragma until after we have merged this declaration
15674 with any previous declarations; if the original declaration
15675 has a linkage specification, that specification applies to
15676 the definition as well, and may affect the mangled name. */
15677 if (DECL_FILE_SCOPE_P (decl1
))
15678 maybe_apply_pragma_weak (decl1
);
15681 /* We are now in the scope of the function being defined. */
15682 current_function_decl
= decl1
;
15684 /* Save the parm names or decls from this function's declarator
15685 where store_parm_decls will find them. */
15686 current_function_parms
= DECL_ARGUMENTS (decl1
);
15688 /* Let the user know we're compiling this function. */
15689 announce_function (decl1
);
15691 gcc_assert (DECL_INITIAL (decl1
));
15693 /* This function may already have been parsed, in which case just
15694 return; our caller will skip over the body without parsing. */
15695 if (DECL_INITIAL (decl1
) != error_mark_node
)
15698 /* Initialize RTL machinery. We cannot do this until
15699 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
15700 even when processing a template; this is how we get
15701 CFUN set up, and our per-function variables initialized.
15702 FIXME factor out the non-RTL stuff. */
15703 bl
= current_binding_level
;
15704 allocate_struct_function (decl1
, processing_template_decl
);
15706 /* Initialize the language data structures. Whenever we start
15707 a new function, we destroy temporaries in the usual way. */
15708 cfun
->language
= ggc_cleared_alloc
<language_function
> ();
15709 current_stmt_tree ()->stmts_are_full_exprs_p
= 1;
15710 current_binding_level
= bl
;
15712 /* If we are (erroneously) defining a function that we have already
15713 defined before, wipe out what we knew before. */
15714 gcc_checking_assert (!DECL_PENDING_INLINE_P (decl1
));
15715 FNDECL_USED_AUTO (decl1
) = false;
15716 DECL_SAVED_AUTO_RETURN_TYPE (decl1
) = NULL
;
15718 if (!processing_template_decl
&& type_uses_auto (restype
))
15720 FNDECL_USED_AUTO (decl1
) = true;
15721 DECL_SAVED_AUTO_RETURN_TYPE (decl1
) = restype
;
15724 /* Start the statement-tree, start the tree now. */
15725 DECL_SAVED_TREE (decl1
) = push_stmt_list ();
15727 if (ctype
&& !doing_friend
&& !DECL_STATIC_FUNCTION_P (decl1
))
15729 /* We know that this was set up by `grokclassfn'. We do not
15730 wait until `store_parm_decls', since evil parse errors may
15731 never get us to that point. Here we keep the consistency
15732 between `current_class_type' and `current_class_ptr'. */
15733 tree t
= DECL_ARGUMENTS (decl1
);
15735 gcc_assert (t
!= NULL_TREE
&& TREE_CODE (t
) == PARM_DECL
);
15736 gcc_assert (TYPE_PTR_P (TREE_TYPE (t
)));
15738 cp_function_chain
->x_current_class_ref
15739 = cp_build_fold_indirect_ref (t
);
15740 /* Set this second to avoid shortcut in cp_build_indirect_ref. */
15741 cp_function_chain
->x_current_class_ptr
= t
;
15743 /* Constructors and destructors need to know whether they're "in
15744 charge" of initializing virtual base classes. */
15745 t
= DECL_CHAIN (t
);
15746 if (DECL_HAS_IN_CHARGE_PARM_P (decl1
))
15748 current_in_charge_parm
= t
;
15749 t
= DECL_CHAIN (t
);
15751 if (DECL_HAS_VTT_PARM_P (decl1
))
15753 gcc_assert (DECL_NAME (t
) == vtt_parm_identifier
);
15754 current_vtt_parm
= t
;
15758 honor_interface
= (!DECL_TEMPLATE_INSTANTIATION (decl1
)
15759 /* Implicitly-defined methods (like the
15760 destructor for a class in which no destructor
15761 is explicitly declared) must not be defined
15762 until their definition is needed. So, we
15763 ignore interface specifications for
15764 compiler-generated functions. */
15765 && !DECL_ARTIFICIAL (decl1
));
15767 if (processing_template_decl
)
15768 /* Don't mess with interface flags. */;
15769 else if (DECL_INTERFACE_KNOWN (decl1
))
15771 tree ctx
= decl_function_context (decl1
);
15773 if (DECL_NOT_REALLY_EXTERN (decl1
))
15774 DECL_EXTERNAL (decl1
) = 0;
15776 if (ctx
!= NULL_TREE
&& vague_linkage_p (ctx
))
15777 /* This is a function in a local class in an extern inline
15778 or template function. */
15779 comdat_linkage (decl1
);
15781 /* If this function belongs to an interface, it is public.
15782 If it belongs to someone else's interface, it is also external.
15783 This only affects inlines and template instantiations. */
15784 else if (!finfo
->interface_unknown
&& honor_interface
)
15786 if (DECL_DECLARED_INLINE_P (decl1
)
15787 || DECL_TEMPLATE_INSTANTIATION (decl1
))
15789 DECL_EXTERNAL (decl1
)
15790 = (finfo
->interface_only
15791 || (DECL_DECLARED_INLINE_P (decl1
)
15792 && ! flag_implement_inlines
15793 && !DECL_VINDEX (decl1
)));
15795 /* For WIN32 we also want to put these in linkonce sections. */
15796 maybe_make_one_only (decl1
);
15799 DECL_EXTERNAL (decl1
) = 0;
15800 DECL_INTERFACE_KNOWN (decl1
) = 1;
15801 /* If this function is in an interface implemented in this file,
15802 make sure that the back end knows to emit this function
15804 if (!DECL_EXTERNAL (decl1
))
15805 mark_needed (decl1
);
15807 else if (finfo
->interface_unknown
&& finfo
->interface_only
15808 && honor_interface
)
15810 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
15811 interface, we will have both finfo->interface_unknown and
15812 finfo->interface_only set. In that case, we don't want to
15813 use the normal heuristics because someone will supply a
15814 #pragma implementation elsewhere, and deducing it here would
15815 produce a conflict. */
15816 comdat_linkage (decl1
);
15817 DECL_EXTERNAL (decl1
) = 0;
15818 DECL_INTERFACE_KNOWN (decl1
) = 1;
15819 DECL_DEFER_OUTPUT (decl1
) = 1;
15823 /* This is a definition, not a reference.
15824 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
15825 if (!GNU_INLINE_P (decl1
))
15826 DECL_EXTERNAL (decl1
) = 0;
15828 if ((DECL_DECLARED_INLINE_P (decl1
)
15829 || DECL_TEMPLATE_INSTANTIATION (decl1
))
15830 && ! DECL_INTERFACE_KNOWN (decl1
))
15831 DECL_DEFER_OUTPUT (decl1
) = 1;
15833 DECL_INTERFACE_KNOWN (decl1
) = 1;
15836 /* Determine the ELF visibility attribute for the function. We must not
15837 do this before calling "pushdecl", as we must allow "duplicate_decls"
15838 to merge any attributes appropriately. We also need to wait until
15840 if (!DECL_CLONED_FUNCTION_P (decl1
))
15841 determine_visibility (decl1
);
15843 if (!processing_template_decl
)
15844 maybe_instantiate_noexcept (decl1
);
15846 begin_scope (sk_function_parms
, decl1
);
15850 if (DECL_DESTRUCTOR_P (decl1
)
15851 || (DECL_CONSTRUCTOR_P (decl1
)
15852 && targetm
.cxx
.cdtor_returns_this ()))
15854 cdtor_label
= create_artificial_label (input_location
);
15855 LABEL_DECL_CDTOR (cdtor_label
) = true;
15858 start_fname_decls ();
15860 store_parm_decls (current_function_parms
);
15862 push_operator_bindings ();
15864 if (!processing_template_decl
15865 && (flag_lifetime_dse
> 1)
15866 && DECL_CONSTRUCTOR_P (decl1
)
15867 && !DECL_CLONED_FUNCTION_P (decl1
)
15868 /* Clobbering an empty base is harmful if it overlays real data. */
15869 && !is_empty_class (current_class_type
)
15870 /* We can't clobber safely for an implicitly-defined default constructor
15871 because part of the initialization might happen before we enter the
15872 constructor, via AGGR_INIT_ZERO_FIRST (c++/68006). */
15873 && !implicit_default_ctor_p (decl1
))
15874 finish_expr_stmt (build_clobber_this ());
15876 if (!processing_template_decl
15877 && DECL_CONSTRUCTOR_P (decl1
)
15878 && sanitize_flags_p (SANITIZE_VPTR
)
15879 && !DECL_CLONED_FUNCTION_P (decl1
)
15880 && !implicit_default_ctor_p (decl1
))
15881 cp_ubsan_maybe_initialize_vtbl_ptrs (current_class_ptr
);
15883 start_lambda_scope (decl1
);
15889 /* Like start_preparsed_function, except that instead of a
15890 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
15892 Returns true on success. If the DECLARATOR is not suitable
15893 for a function, we return false, which tells the parser to
15894 skip the entire function. */
15897 start_function (cp_decl_specifier_seq
*declspecs
,
15898 const cp_declarator
*declarator
,
15903 decl1
= grokdeclarator (declarator
, declspecs
, FUNCDEF
, 1, &attrs
);
15904 invoke_plugin_callbacks (PLUGIN_START_PARSE_FUNCTION
, decl1
);
15905 if (decl1
== error_mark_node
)
15908 if (DECL_MAIN_P (decl1
))
15909 /* main must return int. grokfndecl should have corrected it
15910 (and issued a diagnostic) if the user got it wrong. */
15911 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1
)),
15912 integer_type_node
));
15914 return start_preparsed_function (decl1
, attrs
, /*flags=*/SF_DEFAULT
);
15917 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
15921 use_eh_spec_block (tree fn
)
15923 return (flag_exceptions
&& flag_enforce_eh_specs
15924 && !processing_template_decl
15925 && !type_throw_all_p (TREE_TYPE (fn
))
15926 /* We insert the EH_SPEC_BLOCK only in the original
15927 function; then, it is copied automatically to the
15929 && !DECL_CLONED_FUNCTION_P (fn
)
15930 /* Implicitly-generated constructors and destructors have
15931 exception specifications. However, those specifications
15932 are the union of the possible exceptions specified by the
15933 constructors/destructors for bases and members, so no
15934 unallowed exception will ever reach this function. By
15935 not creating the EH_SPEC_BLOCK we save a little memory,
15936 and we avoid spurious warnings about unreachable
15938 && !DECL_DEFAULTED_FN (fn
));
15941 /* Helper function to push ARGS into the current lexical scope. DECL
15942 is the function declaration. NONPARMS is used to handle enum
15946 do_push_parm_decls (tree decl
, tree args
, tree
*nonparms
)
15948 /* If we're doing semantic analysis, then we'll call pushdecl
15949 for each of these. We must do them in reverse order so that
15950 they end in the correct forward order. */
15951 args
= nreverse (args
);
15954 for (tree parm
= args
; parm
; parm
= next
)
15956 next
= DECL_CHAIN (parm
);
15957 if (TREE_CODE (parm
) == PARM_DECL
)
15961 /* If we find an enum constant or a type tag, put it aside for
15963 TREE_CHAIN (parm
) = NULL_TREE
;
15964 *nonparms
= chainon (*nonparms
, parm
);
15968 /* Get the decls in their original chain order and record in the
15969 function. This is all and only the PARM_DECLs that were
15970 pushed into scope by the loop above. */
15971 DECL_ARGUMENTS (decl
) = get_local_decls ();
15974 /* Store the parameter declarations into the current function declaration.
15975 This is called after parsing the parameter declarations, before
15976 digesting the body of the function.
15978 Also install to binding contour return value identifier, if any. */
15981 store_parm_decls (tree current_function_parms
)
15983 tree fndecl
= current_function_decl
;
15985 /* This is a chain of any other decls that came in among the parm
15986 declarations. If a parm is declared with enum {foo, bar} x;
15987 then CONST_DECLs for foo and bar are put here. */
15988 tree nonparms
= NULL_TREE
;
15990 if (current_function_parms
)
15992 /* This case is when the function was defined with an ANSI prototype.
15993 The parms already have decls, so we need not do anything here
15994 except record them as in effect
15995 and complain if any redundant old-style parm decls were written. */
15997 tree specparms
= current_function_parms
;
15999 /* Must clear this because it might contain TYPE_DECLs declared
16001 current_binding_level
->names
= NULL
;
16003 do_push_parm_decls (fndecl
, specparms
, &nonparms
);
16006 DECL_ARGUMENTS (fndecl
) = NULL_TREE
;
16008 /* Now store the final chain of decls for the arguments
16009 as the decl-chain of the current lexical scope.
16010 Put the enumerators in as well, at the front so that
16011 DECL_ARGUMENTS is not modified. */
16012 current_binding_level
->names
= chainon (nonparms
, DECL_ARGUMENTS (fndecl
));
16014 if (use_eh_spec_block (current_function_decl
))
16015 current_eh_spec_block
= begin_eh_spec_block ();
16019 /* Set the return value of the constructor (if present). */
16022 finish_constructor_body (void)
16027 if (targetm
.cxx
.cdtor_returns_this ())
16029 /* Any return from a constructor will end up here. */
16030 add_stmt (build_stmt (input_location
, LABEL_EXPR
, cdtor_label
));
16032 val
= DECL_ARGUMENTS (current_function_decl
);
16033 val
= build2 (MODIFY_EXPR
, TREE_TYPE (val
),
16034 DECL_RESULT (current_function_decl
), val
);
16035 /* Return the address of the object. */
16036 exprstmt
= build_stmt (input_location
, RETURN_EXPR
, val
);
16037 add_stmt (exprstmt
);
16041 /* Do all the processing for the beginning of a destructor; set up the
16042 vtable pointers and cleanups for bases and members. */
16045 begin_destructor_body (void)
16047 tree compound_stmt
;
16049 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
16050 issued an error message. We still want to try to process the
16051 body of the function, but initialize_vtbl_ptrs will crash if
16052 TYPE_BINFO is NULL. */
16053 if (COMPLETE_TYPE_P (current_class_type
))
16055 compound_stmt
= begin_compound_stmt (0);
16056 /* Make all virtual function table pointers in non-virtual base
16057 classes point to CURRENT_CLASS_TYPE's virtual function
16059 initialize_vtbl_ptrs (current_class_ptr
);
16060 finish_compound_stmt (compound_stmt
);
16062 if (flag_lifetime_dse
16063 /* Clobbering an empty base is harmful if it overlays real data. */
16064 && !is_empty_class (current_class_type
))
16066 if (sanitize_flags_p (SANITIZE_VPTR
)
16067 && (flag_sanitize_recover
& SANITIZE_VPTR
) == 0
16068 && TYPE_CONTAINS_VPTR_P (current_class_type
))
16070 tree binfo
= TYPE_BINFO (current_class_type
);
16072 = cp_build_fold_indirect_ref (current_class_ptr
);
16074 tree vtbl_ptr
= build_vfield_ref (ref
, TREE_TYPE (binfo
));
16075 tree vtbl
= build_zero_cst (TREE_TYPE (vtbl_ptr
));
16076 tree stmt
= cp_build_modify_expr (input_location
, vtbl_ptr
,
16078 tf_warning_or_error
);
16079 /* If the vptr is shared with some virtual nearly empty base,
16080 don't clear it if not in charge, the dtor of the virtual
16081 nearly empty base will do that later. */
16082 if (CLASSTYPE_VBASECLASSES (current_class_type
)
16083 && CLASSTYPE_PRIMARY_BINFO (current_class_type
)
16085 (CLASSTYPE_PRIMARY_BINFO (current_class_type
)))
16087 stmt
= convert_to_void (stmt
, ICV_STATEMENT
,
16088 tf_warning_or_error
);
16089 stmt
= build_if_in_charge (stmt
);
16091 finish_decl_cleanup (NULL_TREE
, stmt
);
16094 finish_decl_cleanup (NULL_TREE
, build_clobber_this ());
16097 /* And insert cleanups for our bases and members so that they
16098 will be properly destroyed if we throw. */
16099 push_base_cleanups ();
16103 /* At the end of every destructor we generate code to delete the object if
16104 necessary. Do that now. */
16107 finish_destructor_body (void)
16111 /* Any return from a destructor will end up here; that way all base
16112 and member cleanups will be run when the function returns. */
16113 add_stmt (build_stmt (input_location
, LABEL_EXPR
, cdtor_label
));
16115 if (targetm
.cxx
.cdtor_returns_this ())
16119 val
= DECL_ARGUMENTS (current_function_decl
);
16120 val
= build2 (MODIFY_EXPR
, TREE_TYPE (val
),
16121 DECL_RESULT (current_function_decl
), val
);
16122 /* Return the address of the object. */
16123 exprstmt
= build_stmt (input_location
, RETURN_EXPR
, val
);
16124 add_stmt (exprstmt
);
16128 /* Do the necessary processing for the beginning of a function body, which
16129 in this case includes member-initializers, but not the catch clauses of
16130 a function-try-block. Currently, this means opening a binding level
16131 for the member-initializers (in a ctor), member cleanups (in a dtor),
16132 and capture proxies (in a lambda operator()). */
16135 begin_function_body (void)
16139 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl
))
16142 if (processing_template_decl
)
16143 /* Do nothing now. */;
16145 /* Always keep the BLOCK node associated with the outermost pair of
16146 curly braces of a function. These are needed for correct
16147 operation of dwarfout.c. */
16148 keep_next_level (true);
16150 stmt
= begin_compound_stmt (BCS_FN_BODY
);
16152 if (processing_template_decl
)
16153 /* Do nothing now. */;
16154 else if (DECL_DESTRUCTOR_P (current_function_decl
))
16155 begin_destructor_body ();
16160 /* Do the processing for the end of a function body. Currently, this means
16161 closing out the cleanups for fully-constructed bases and members, and in
16162 the case of the destructor, deleting the object if desired. Again, this
16163 is only meaningful for [cd]tors, since they are the only functions where
16164 there is a significant distinction between the main body and any
16165 function catch clauses. Handling, say, main() return semantics here
16166 would be wrong, as flowing off the end of a function catch clause for
16167 main() would also need to return 0. */
16170 finish_function_body (tree compstmt
)
16172 if (compstmt
== NULL_TREE
)
16175 /* Close the block. */
16176 finish_compound_stmt (compstmt
);
16178 if (processing_template_decl
)
16179 /* Do nothing now. */;
16180 else if (DECL_CONSTRUCTOR_P (current_function_decl
))
16181 finish_constructor_body ();
16182 else if (DECL_DESTRUCTOR_P (current_function_decl
))
16183 finish_destructor_body ();
16186 /* Given a function, returns the BLOCK corresponding to the outermost level
16187 of curly braces, skipping the artificial block created for constructor
16191 outer_curly_brace_block (tree fndecl
)
16193 tree block
= DECL_INITIAL (fndecl
);
16194 if (BLOCK_OUTER_CURLY_BRACE_P (block
))
16196 block
= BLOCK_SUBBLOCKS (block
);
16197 if (BLOCK_OUTER_CURLY_BRACE_P (block
))
16199 block
= BLOCK_SUBBLOCKS (block
);
16200 gcc_assert (BLOCK_OUTER_CURLY_BRACE_P (block
));
16204 /* If FNDECL is a class's key method, add the class to the list of
16205 keyed classes that should be emitted. */
16208 record_key_method_defined (tree fndecl
)
16210 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl
)
16211 && DECL_VIRTUAL_P (fndecl
)
16212 && !processing_template_decl
)
16214 tree fnclass
= DECL_CONTEXT (fndecl
);
16215 if (fndecl
== CLASSTYPE_KEY_METHOD (fnclass
))
16216 vec_safe_push (keyed_classes
, fnclass
);
16220 /* Subroutine of finish_function.
16221 Save the body of constexpr functions for possible
16222 future compile time evaluation. */
16225 maybe_save_function_definition (tree fun
)
16227 if (!processing_template_decl
16228 && DECL_DECLARED_CONSTEXPR_P (fun
)
16229 && !cp_function_chain
->invalid_constexpr
16230 && !DECL_CLONED_FUNCTION_P (fun
))
16231 register_constexpr_fundef (fun
, DECL_SAVED_TREE (fun
));
16234 /* Attempt to add a fix-it hint to RICHLOC suggesting the insertion
16235 of "return *this;" immediately before its location, using FNDECL's
16236 first statement (if any) to give the indentation, if appropriate. */
16239 add_return_star_this_fixit (gcc_rich_location
*richloc
, tree fndecl
)
16241 location_t indent
= UNKNOWN_LOCATION
;
16242 tree stmts
= expr_first (DECL_SAVED_TREE (fndecl
));
16244 indent
= EXPR_LOCATION (stmts
);
16245 richloc
->add_fixit_insert_formatted ("return *this;",
16246 richloc
->get_loc (),
16250 /* Finish up a function declaration and compile that function
16251 all the way to assembler language output. The free the storage
16252 for the function definition. INLINE_P is TRUE if we just
16253 finished processing the body of an in-class inline function
16254 definition. (This processing will have taken place after the
16255 class definition is complete.) */
16258 finish_function (bool inline_p
)
16260 tree fndecl
= current_function_decl
;
16261 tree fntype
, ctype
= NULL_TREE
;
16263 /* When we get some parse errors, we can end up without a
16264 current_function_decl, so cope. */
16265 if (fndecl
== NULL_TREE
)
16266 return error_mark_node
;
16268 finish_lambda_scope ();
16270 if (c_dialect_objc ())
16271 objc_finish_function ();
16273 record_key_method_defined (fndecl
);
16275 fntype
= TREE_TYPE (fndecl
);
16277 /* TREE_READONLY (fndecl) = 1;
16278 This caused &foo to be of type ptr-to-const-function
16279 which then got a warning when stored in a ptr-to-function variable. */
16281 gcc_assert (building_stmt_list_p ());
16282 /* The current function is being defined, so its DECL_INITIAL should
16283 be set, and unless there's a multiple definition, it should be
16284 error_mark_node. */
16285 gcc_assert (DECL_INITIAL (fndecl
) == error_mark_node
);
16287 /* For a cloned function, we've already got all the code we need;
16288 there's no need to add any extra bits. */
16289 if (!DECL_CLONED_FUNCTION_P (fndecl
))
16291 /* Make it so that `main' always returns 0 by default. */
16292 if (DECL_MAIN_P (current_function_decl
))
16293 finish_return_stmt (integer_zero_node
);
16295 if (use_eh_spec_block (current_function_decl
))
16296 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
16297 (TREE_TYPE (current_function_decl
)),
16298 current_eh_spec_block
);
16301 /* If we're saving up tree structure, tie off the function now. */
16302 DECL_SAVED_TREE (fndecl
) = pop_stmt_list (DECL_SAVED_TREE (fndecl
));
16304 finish_fname_decls ();
16306 /* If this function can't throw any exceptions, remember that. */
16307 if (!processing_template_decl
16308 && !cp_function_chain
->can_throw
16309 && !flag_non_call_exceptions
16310 && !decl_replaceable_p (fndecl
))
16311 TREE_NOTHROW (fndecl
) = 1;
16313 /* This must come after expand_function_end because cleanups might
16314 have declarations (from inline functions) that need to go into
16315 this function's blocks. */
16317 /* If the current binding level isn't the outermost binding level
16318 for this function, either there is a bug, or we have experienced
16319 syntax errors and the statement tree is malformed. */
16320 if (current_binding_level
->kind
!= sk_function_parms
)
16322 /* Make sure we have already experienced errors. */
16323 gcc_assert (errorcount
);
16325 /* Throw away the broken statement tree and extra binding
16327 DECL_SAVED_TREE (fndecl
) = alloc_stmt_list ();
16329 while (current_binding_level
->kind
!= sk_function_parms
)
16331 if (current_binding_level
->kind
== sk_class
)
16332 pop_nested_class ();
16334 poplevel (0, 0, 0);
16337 poplevel (1, 0, 1);
16339 /* Statements should always be full-expressions at the outermost set
16340 of curly braces for a function. */
16341 gcc_assert (stmts_are_full_exprs_p ());
16343 /* If there are no return statements in a function with auto return type,
16344 the return type is void. But if the declared type is something like
16345 auto*, this is an error. */
16346 if (!processing_template_decl
&& FNDECL_USED_AUTO (fndecl
)
16347 && TREE_TYPE (fntype
) == DECL_SAVED_AUTO_RETURN_TYPE (fndecl
))
16349 if (is_auto (DECL_SAVED_AUTO_RETURN_TYPE (fndecl
)))
16351 apply_deduced_return_type (fndecl
, void_type_node
);
16352 fntype
= TREE_TYPE (fndecl
);
16354 else if (!current_function_returns_value
16355 && !current_function_returns_null
)
16357 error ("no return statements in function returning %qT",
16358 DECL_SAVED_AUTO_RETURN_TYPE (fndecl
));
16359 inform (input_location
, "only plain %<auto%> return type can be "
16360 "deduced to %<void%>");
16364 // If this is a concept, check that the definition is reasonable.
16365 if (DECL_DECLARED_CONCEPT_P (fndecl
))
16366 check_function_concept (fndecl
);
16368 /* Lambda closure members are implicitly constexpr if possible. */
16369 if (cxx_dialect
>= cxx17
16370 && LAMBDA_TYPE_P (CP_DECL_CONTEXT (fndecl
)))
16371 DECL_DECLARED_CONSTEXPR_P (fndecl
)
16372 = ((processing_template_decl
16373 || is_valid_constexpr_fn (fndecl
, /*complain*/false))
16374 && potential_constant_expression (DECL_SAVED_TREE (fndecl
)));
16376 /* Save constexpr function body before it gets munged by
16377 the NRV transformation. */
16378 maybe_save_function_definition (fndecl
);
16380 /* Invoke the pre-genericize plugin before we start munging things. */
16381 if (!processing_template_decl
)
16382 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE
, fndecl
);
16384 /* Perform delayed folding before NRV transformation. */
16385 if (!processing_template_decl
)
16386 cp_fold_function (fndecl
);
16388 /* Set up the named return value optimization, if we can. Candidate
16389 variables are selected in check_return_expr. */
16390 if (current_function_return_value
)
16392 tree r
= current_function_return_value
;
16395 if (r
!= error_mark_node
16396 /* This is only worth doing for fns that return in memory--and
16397 simpler, since we don't have to worry about promoted modes. */
16398 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl
)), fndecl
)
16399 /* Only allow this for variables declared in the outer scope of
16400 the function so we know that their lifetime always ends with a
16401 return; see g++.dg/opt/nrv6.C. We could be more flexible if
16402 we were to do this optimization in tree-ssa. */
16403 && (outer
= outer_curly_brace_block (fndecl
))
16404 && chain_member (r
, BLOCK_VARS (outer
)))
16405 finalize_nrv (&DECL_SAVED_TREE (fndecl
), r
, DECL_RESULT (fndecl
));
16407 current_function_return_value
= NULL_TREE
;
16410 /* Remember that we were in class scope. */
16411 if (current_class_name
)
16412 ctype
= current_class_type
;
16414 /* Must mark the RESULT_DECL as being in this function. */
16415 DECL_CONTEXT (DECL_RESULT (fndecl
)) = fndecl
;
16417 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
16418 to the FUNCTION_DECL node itself. */
16419 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl
)) = fndecl
;
16421 /* Complain if there's just no return statement. */
16422 if (warn_return_type
16423 && !VOID_TYPE_P (TREE_TYPE (fntype
))
16424 && !dependent_type_p (TREE_TYPE (fntype
))
16425 && !current_function_returns_value
&& !current_function_returns_null
16426 /* Don't complain if we abort or throw. */
16427 && !current_function_returns_abnormally
16428 /* Don't complain if there's an infinite loop. */
16429 && !current_function_infinite_loop
16430 /* Don't complain if we are declared noreturn. */
16431 && !TREE_THIS_VOLATILE (fndecl
)
16432 && !DECL_NAME (DECL_RESULT (fndecl
))
16433 && !TREE_NO_WARNING (fndecl
)
16434 /* Structor return values (if any) are set by the compiler. */
16435 && !DECL_CONSTRUCTOR_P (fndecl
)
16436 && !DECL_DESTRUCTOR_P (fndecl
)
16437 && targetm
.warn_func_return (fndecl
))
16439 gcc_rich_location
richloc (input_location
);
16440 /* Potentially add a "return *this;" fix-it hint for
16441 assignment operators. */
16442 if (IDENTIFIER_ASSIGN_OP_P (DECL_NAME (fndecl
)))
16444 tree valtype
= TREE_TYPE (DECL_RESULT (fndecl
));
16445 if (TREE_CODE (valtype
) == REFERENCE_TYPE
16446 && current_class_ref
16447 && same_type_ignoring_top_level_qualifiers_p
16448 (TREE_TYPE (valtype
), TREE_TYPE (current_class_ref
))
16449 && global_dc
->option_enabled (OPT_Wreturn_type
,
16450 global_dc
->lang_mask
,
16451 global_dc
->option_state
))
16452 add_return_star_this_fixit (&richloc
, fndecl
);
16454 if (warning_at (&richloc
, OPT_Wreturn_type
,
16455 "no return statement in function returning non-void"))
16456 TREE_NO_WARNING (fndecl
) = 1;
16459 /* Store the end of the function, so that we get good line number
16460 info for the epilogue. */
16461 cfun
->function_end_locus
= input_location
;
16463 /* Complain about parameters that are only set, but never otherwise used. */
16464 if (warn_unused_but_set_parameter
16465 && !processing_template_decl
16466 && errorcount
== unused_but_set_errorcount
16467 && !DECL_CLONED_FUNCTION_P (fndecl
))
16471 for (decl
= DECL_ARGUMENTS (fndecl
);
16473 decl
= DECL_CHAIN (decl
))
16474 if (TREE_USED (decl
)
16475 && TREE_CODE (decl
) == PARM_DECL
16476 && !DECL_READ_P (decl
)
16477 && DECL_NAME (decl
)
16478 && !DECL_ARTIFICIAL (decl
)
16479 && !TREE_NO_WARNING (decl
)
16480 && !DECL_IN_SYSTEM_HEADER (decl
)
16481 && TREE_TYPE (decl
) != error_mark_node
16482 && !TYPE_REF_P (TREE_TYPE (decl
))
16483 && (!CLASS_TYPE_P (TREE_TYPE (decl
))
16484 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl
))))
16485 warning_at (DECL_SOURCE_LOCATION (decl
),
16486 OPT_Wunused_but_set_parameter
,
16487 "parameter %qD set but not used", decl
);
16488 unused_but_set_errorcount
= errorcount
;
16491 /* Complain about locally defined typedefs that are not used in this
16493 maybe_warn_unused_local_typedefs ();
16495 /* Possibly warn about unused parameters. */
16496 if (warn_unused_parameter
16497 && !processing_template_decl
16498 && !DECL_CLONED_FUNCTION_P (fndecl
))
16499 do_warn_unused_parameter (fndecl
);
16501 /* Genericize before inlining. */
16502 if (!processing_template_decl
)
16503 cp_genericize (fndecl
);
16505 /* We're leaving the context of this function, so zap cfun. It's still in
16506 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
16508 current_function_decl
= NULL
;
16510 /* If this is an in-class inline definition, we may have to pop the
16511 bindings for the template parameters that we added in
16512 maybe_begin_member_template_processing when start_function was
16515 maybe_end_member_template_processing ();
16517 /* Leave the scope of the class. */
16519 pop_nested_class ();
16524 current_function_decl
= NULL_TREE
;
16526 invoke_plugin_callbacks (PLUGIN_FINISH_PARSE_FUNCTION
, fndecl
);
16530 /* Create the FUNCTION_DECL for a function definition.
16531 DECLSPECS and DECLARATOR are the parts of the declaration;
16532 they describe the return type and the name of the function,
16533 but twisted together in a fashion that parallels the syntax of C.
16535 This function creates a binding context for the function body
16536 as well as setting up the FUNCTION_DECL in current_function_decl.
16538 Returns a FUNCTION_DECL on success.
16540 If the DECLARATOR is not suitable for a function (it defines a datum
16541 instead), we return 0, which tells yyparse to report a parse error.
16543 May return void_type_node indicating that this method is actually
16544 a friend. See grokfield for more details.
16546 Came here with a `.pushlevel' .
16548 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
16549 CHANGES TO CODE IN `grokfield'. */
16552 grokmethod (cp_decl_specifier_seq
*declspecs
,
16553 const cp_declarator
*declarator
, tree attrlist
)
16555 tree fndecl
= grokdeclarator (declarator
, declspecs
, MEMFUNCDEF
, 0,
16558 if (fndecl
== error_mark_node
)
16559 return error_mark_node
;
16562 cplus_decl_attributes (&fndecl
, attrlist
, 0);
16564 /* Pass friends other than inline friend functions back. */
16565 if (fndecl
== void_type_node
)
16568 if (DECL_IN_AGGR_P (fndecl
))
16570 if (DECL_CLASS_SCOPE_P (fndecl
))
16571 error ("%qD is already defined in class %qT", fndecl
,
16572 DECL_CONTEXT (fndecl
));
16573 return error_mark_node
;
16576 check_template_shadow (fndecl
);
16578 if (TREE_PUBLIC (fndecl
))
16579 DECL_COMDAT (fndecl
) = 1;
16580 DECL_DECLARED_INLINE_P (fndecl
) = 1;
16581 DECL_NO_INLINE_WARNING_P (fndecl
) = 1;
16583 /* We process method specializations in finish_struct_1. */
16584 if (processing_template_decl
&& !DECL_TEMPLATE_SPECIALIZATION (fndecl
))
16586 fndecl
= push_template_decl (fndecl
);
16587 if (fndecl
== error_mark_node
)
16591 if (! DECL_FRIEND_P (fndecl
))
16593 if (DECL_CHAIN (fndecl
))
16595 fndecl
= copy_node (fndecl
);
16596 TREE_CHAIN (fndecl
) = NULL_TREE
;
16600 cp_finish_decl (fndecl
, NULL_TREE
, false, NULL_TREE
, 0);
16602 DECL_IN_AGGR_P (fndecl
) = 1;
16607 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
16608 we can lay it out later, when and if its type becomes complete.
16610 Also handle constexpr variables where the initializer involves
16611 an unlowered PTRMEM_CST because the class isn't complete yet. */
16614 maybe_register_incomplete_var (tree var
)
16616 gcc_assert (VAR_P (var
));
16618 /* Keep track of variables with incomplete types. */
16619 if (!processing_template_decl
&& TREE_TYPE (var
) != error_mark_node
16620 && DECL_EXTERNAL (var
))
16622 tree inner_type
= TREE_TYPE (var
);
16624 while (TREE_CODE (inner_type
) == ARRAY_TYPE
)
16625 inner_type
= TREE_TYPE (inner_type
);
16626 inner_type
= TYPE_MAIN_VARIANT (inner_type
);
16628 if ((!COMPLETE_TYPE_P (inner_type
) && CLASS_TYPE_P (inner_type
))
16629 /* RTTI TD entries are created while defining the type_info. */
16630 || (TYPE_LANG_SPECIFIC (inner_type
)
16631 && TYPE_BEING_DEFINED (inner_type
)))
16633 incomplete_var iv
= {var
, inner_type
};
16634 vec_safe_push (incomplete_vars
, iv
);
16636 else if (!(DECL_LANG_SPECIFIC (var
) && DECL_TEMPLATE_INFO (var
))
16637 && decl_constant_var_p (var
)
16638 && (TYPE_PTRMEM_P (inner_type
) || CLASS_TYPE_P (inner_type
)))
16640 /* When the outermost open class is complete we can resolve any
16641 pointers-to-members. */
16642 tree context
= outermost_open_class ();
16643 incomplete_var iv
= {var
, context
};
16644 vec_safe_push (incomplete_vars
, iv
);
16649 /* Called when a class type (given by TYPE) is defined. If there are
16650 any existing VAR_DECLs whose type has been completed by this
16651 declaration, update them now. */
16654 complete_vars (tree type
)
16657 incomplete_var
*iv
;
16659 for (ix
= 0; vec_safe_iterate (incomplete_vars
, ix
, &iv
); )
16661 if (same_type_p (type
, iv
->incomplete_type
))
16663 tree var
= iv
->decl
;
16664 tree type
= TREE_TYPE (var
);
16666 if (type
!= error_mark_node
16667 && (TYPE_MAIN_VARIANT (strip_array_types (type
))
16668 == iv
->incomplete_type
))
16670 /* Complete the type of the variable. The VAR_DECL itself
16671 will be laid out in expand_expr. */
16672 complete_type (type
);
16673 cp_apply_type_quals_to_decl (cp_type_quals (type
), var
);
16676 /* Remove this entry from the list. */
16677 incomplete_vars
->unordered_remove (ix
);
16683 /* Check for pending declarations which may have abstract type. */
16684 complete_type_check_abstract (type
);
16687 /* If DECL is of a type which needs a cleanup, build and return an
16688 expression to perform that cleanup here. Return NULL_TREE if no
16689 cleanup need be done. DECL can also be a _REF when called from
16690 split_nonconstant_init_1. */
16693 cxx_maybe_build_cleanup (tree decl
, tsubst_flags_t complain
)
16699 /* Assume no cleanup is required. */
16700 cleanup
= NULL_TREE
;
16702 if (error_operand_p (decl
))
16705 /* Handle "__attribute__((cleanup))". We run the cleanup function
16706 before the destructor since the destructor is what actually
16707 terminates the lifetime of the object. */
16709 attr
= lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl
));
16718 /* Get the name specified by the user for the cleanup function. */
16719 id
= TREE_VALUE (TREE_VALUE (attr
));
16720 /* Look up the name to find the cleanup function to call. It is
16721 important to use lookup_name here because that is what is
16722 used in c-common.c:handle_cleanup_attribute when performing
16723 initial checks on the attribute. Note that those checks
16724 include ensuring that the function found is not an overloaded
16725 function, or an object with an overloaded call operator,
16726 etc.; we can rely on the fact that the function found is an
16727 ordinary FUNCTION_DECL. */
16728 fn
= lookup_name (id
);
16729 arg
= build_address (decl
);
16730 if (!mark_used (decl
, complain
) && !(complain
& tf_error
))
16731 return error_mark_node
;
16732 cleanup
= cp_build_function_call_nary (fn
, complain
, arg
, NULL_TREE
);
16733 if (cleanup
== error_mark_node
)
16734 return error_mark_node
;
16736 /* Handle ordinary C++ destructors. */
16737 type
= TREE_TYPE (decl
);
16738 if (type_build_dtor_call (type
))
16740 int flags
= LOOKUP_NORMAL
|LOOKUP_NONVIRTUAL
|LOOKUP_DESTRUCTOR
;
16744 if (TREE_CODE (type
) == ARRAY_TYPE
)
16747 addr
= build_address (decl
);
16749 call
= build_delete (TREE_TYPE (addr
), addr
,
16750 sfk_complete_destructor
, flags
, 0, complain
);
16751 if (call
== error_mark_node
)
16752 cleanup
= error_mark_node
;
16753 else if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type
))
16754 /* Discard the call. */;
16756 cleanup
= cp_build_compound_expr (cleanup
, call
, complain
);
16761 /* build_delete sets the location of the destructor call to the
16762 current location, even though the destructor is going to be
16763 called later, at the end of the current scope. This can lead to
16764 a "jumpy" behavior for users of debuggers when they step around
16765 the end of the block. So let's unset the location of the
16766 destructor call instead. */
16767 protected_set_expr_location (cleanup
, UNKNOWN_LOCATION
);
16771 && !lookup_attribute ("warn_unused", TYPE_ATTRIBUTES (TREE_TYPE (decl
)))
16772 /* Treat objects with destructors as used; the destructor may do
16773 something substantive. */
16774 && !mark_used (decl
, complain
) && !(complain
& tf_error
))
16775 return error_mark_node
;
16781 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
16782 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
16783 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
16786 static_fn_type (tree memfntype
)
16791 if (TYPE_PTRMEMFUNC_P (memfntype
))
16792 memfntype
= TYPE_PTRMEMFUNC_FN_TYPE (memfntype
);
16793 if (INDIRECT_TYPE_P (memfntype
)
16794 || TREE_CODE (memfntype
) == FUNCTION_DECL
)
16795 memfntype
= TREE_TYPE (memfntype
);
16796 if (TREE_CODE (memfntype
) == FUNCTION_TYPE
)
16798 gcc_assert (TREE_CODE (memfntype
) == METHOD_TYPE
);
16799 args
= TYPE_ARG_TYPES (memfntype
);
16800 fntype
= build_function_type (TREE_TYPE (memfntype
), TREE_CHAIN (args
));
16801 fntype
= apply_memfn_quals (fntype
, type_memfn_quals (memfntype
));
16802 fntype
= (cp_build_type_attribute_variant
16803 (fntype
, TYPE_ATTRIBUTES (memfntype
)));
16804 fntype
= cxx_copy_lang_qualifiers (fntype
, memfntype
);
16808 /* DECL was originally constructed as a non-static member function,
16809 but turned out to be static. Update it accordingly. */
16812 revert_static_member_fn (tree decl
)
16814 tree stype
= static_fn_type (decl
);
16815 cp_cv_quals quals
= type_memfn_quals (stype
);
16816 cp_ref_qualifier rqual
= type_memfn_rqual (stype
);
16818 if (quals
!= TYPE_UNQUALIFIED
|| rqual
!= REF_QUAL_NONE
)
16819 stype
= apply_memfn_quals (stype
, TYPE_UNQUALIFIED
, REF_QUAL_NONE
);
16821 TREE_TYPE (decl
) = stype
;
16823 if (DECL_ARGUMENTS (decl
))
16824 DECL_ARGUMENTS (decl
) = DECL_CHAIN (DECL_ARGUMENTS (decl
));
16825 DECL_STATIC_FUNCTION_P (decl
) = 1;
16828 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
16829 one of the language-independent trees. */
16831 enum cp_tree_node_structure_enum
16832 cp_tree_node_structure (union lang_tree_node
* t
)
16834 switch (TREE_CODE (&t
->generic
))
16836 case ARGUMENT_PACK_SELECT
: return TS_CP_ARGUMENT_PACK_SELECT
;
16837 case BASELINK
: return TS_CP_BASELINK
;
16838 case CONSTRAINT_INFO
: return TS_CP_CONSTRAINT_INFO
;
16839 case DEFERRED_NOEXCEPT
: return TS_CP_DEFERRED_NOEXCEPT
;
16840 case DEFERRED_PARSE
: return TS_CP_DEFERRED_PARSE
;
16841 case IDENTIFIER_NODE
: return TS_CP_IDENTIFIER
;
16842 case LAMBDA_EXPR
: return TS_CP_LAMBDA_EXPR
;
16843 case OVERLOAD
: return TS_CP_OVERLOAD
;
16844 case PTRMEM_CST
: return TS_CP_PTRMEM
;
16845 case STATIC_ASSERT
: return TS_CP_STATIC_ASSERT
;
16846 case TEMPLATE_DECL
: return TS_CP_TEMPLATE_DECL
;
16847 case TEMPLATE_INFO
: return TS_CP_TEMPLATE_INFO
;
16848 case TEMPLATE_PARM_INDEX
: return TS_CP_TPI
;
16849 case TRAIT_EXPR
: return TS_CP_TRAIT_EXPR
;
16850 case USERDEF_LITERAL
: return TS_CP_USERDEF_LITERAL
;
16851 default: return TS_CP_GENERIC
;
16855 /* Build the void_list_node (void_type_node having been created). */
16857 build_void_list_node (void)
16859 tree t
= build_tree_list (NULL_TREE
, void_type_node
);
16864 cp_missing_noreturn_ok_p (tree decl
)
16866 /* A missing noreturn is ok for the `main' function. */
16867 return DECL_MAIN_P (decl
);
16870 /* Return the decl used to identify the COMDAT group into which DECL should
16874 cxx_comdat_group (tree decl
)
16876 /* Virtual tables, construction virtual tables, and virtual table
16877 tables all go in a single COMDAT group, named after the primary
16879 if (VAR_P (decl
) && DECL_VTABLE_OR_VTT_P (decl
))
16880 decl
= CLASSTYPE_VTABLES (DECL_CONTEXT (decl
));
16881 /* For all other DECLs, the COMDAT group is the mangled name of the
16882 declaration itself. */
16885 while (DECL_THUNK_P (decl
))
16887 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
16888 into the same section as the target function. In that case
16889 we must return target's name. */
16890 tree target
= THUNK_TARGET (decl
);
16891 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target
)
16892 && DECL_SECTION_NAME (target
) != NULL
16893 && DECL_ONE_ONLY (target
))
16903 /* Returns the return type for FN as written by the user, which may include
16904 a placeholder for a deduced return type. */
16907 fndecl_declared_return_type (tree fn
)
16909 fn
= STRIP_TEMPLATE (fn
);
16910 if (FNDECL_USED_AUTO (fn
))
16911 return DECL_SAVED_AUTO_RETURN_TYPE (fn
);
16913 return TREE_TYPE (TREE_TYPE (fn
));
16916 /* Returns true iff DECL is a variable or function declared with an auto type
16917 that has not yet been deduced to a real type. */
16920 undeduced_auto_decl (tree decl
)
16922 if (cxx_dialect
< cxx11
)
16924 STRIP_ANY_LOCATION_WRAPPER (decl
);
16925 return ((VAR_OR_FUNCTION_DECL_P (decl
)
16926 || TREE_CODE (decl
) == TEMPLATE_DECL
)
16927 && type_uses_auto (TREE_TYPE (decl
)));
16930 /* Complain if DECL has an undeduced return type. */
16933 require_deduced_type (tree decl
, tsubst_flags_t complain
)
16935 if (undeduced_auto_decl (decl
))
16937 if (complain
& tf_error
)
16938 error ("use of %qD before deduction of %<auto%>", decl
);
16944 /* Create a representation of the explicit-specifier with
16945 constant-expression of EXPR. COMPLAIN is as for tsubst. */
16948 build_explicit_specifier (tree expr
, tsubst_flags_t complain
)
16950 if (instantiation_dependent_expression_p (expr
))
16951 /* Wait for instantiation, tsubst_function_decl will handle it. */
16954 expr
= instantiate_non_dependent_expr_sfinae (expr
, complain
);
16955 /* Don't let convert_like_real create more template codes. */
16956 processing_template_decl_sentinel s
;
16957 expr
= build_converted_constant_bool_expr (expr
, complain
);
16958 expr
= cxx_constant_value (expr
);
16962 #include "gt-cp-decl.h"