1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988-2019 Free Software Foundation, Inc.
3 Contributed by Michael Tiemann (tiemann@cygnus.com)
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3, or (at your option)
12 GCC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
22 /* Process declarations and symbol lookup for C++ front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
31 #include "coretypes.h"
33 #include "c-family/c-target.h"
36 #include "stringpool.h"
38 #include "stor-layout.h"
42 #include "tree-iterator.h"
46 #include "c-family/c-objc.h"
47 #include "c-family/c-pragma.h"
48 #include "c-family/c-ubsan.h"
54 #include "gcc-rich-location.h"
55 #include "langhooks.h"
57 /* Possible cases of bad specifiers type used by bad_specifiers. */
59 BSP_VAR
, /* variable */
60 BSP_PARM
, /* parameter */
65 static const char *redeclaration_error_message (tree
, tree
);
67 static int decl_jump_unsafe (tree
);
68 static void require_complete_types_for_parms (tree
);
69 static tree
grok_reference_init (tree
, tree
, tree
, int);
70 static tree
grokvardecl (tree
, tree
, tree
, const cp_decl_specifier_seq
*,
71 int, int, int, bool, int, tree
, location_t
);
72 static void check_static_variable_definition (tree
, tree
);
73 static void record_unknown_type (tree
, const char *);
74 static tree
builtin_function_1 (tree
, tree
, bool);
75 static int member_function_or_else (tree
, tree
, enum overload_flags
);
76 static tree
local_variable_p_walkfn (tree
*, int *, void *);
77 static const char *tag_name (enum tag_types
);
78 static tree
lookup_and_check_tag (enum tag_types
, tree
, tag_scope
, bool);
79 static void maybe_deduce_size_from_array_init (tree
, tree
);
80 static void layout_var_decl (tree
);
81 static tree
check_initializer (tree
, tree
, int, vec
<tree
, va_gc
> **);
82 static void make_rtl_for_nonlocal_decl (tree
, tree
, const char *);
83 static void save_function_data (tree
);
84 static void copy_type_enum (tree
, tree
);
85 static void check_function_type (tree
, tree
);
86 static void finish_constructor_body (void);
87 static void begin_destructor_body (void);
88 static void finish_destructor_body (void);
89 static void record_key_method_defined (tree
);
90 static tree
create_array_type_for_decl (tree
, tree
, tree
, location_t
);
91 static tree
get_atexit_node (void);
92 static tree
get_dso_handle_node (void);
93 static tree
start_cleanup_fn (void);
94 static void end_cleanup_fn (void);
95 static tree
cp_make_fname_decl (location_t
, tree
, int);
96 static void initialize_predefined_identifiers (void);
97 static tree check_special_function_return_type
98 (special_function_kind
, tree
, tree
, int, const location_t
*);
99 static tree
push_cp_library_fn (enum tree_code
, tree
, int);
100 static tree
build_cp_library_fn (tree
, enum tree_code
, tree
, int);
101 static void store_parm_decls (tree
);
102 static void initialize_local_var (tree
, tree
);
103 static void expand_static_init (tree
, tree
);
105 /* The following symbols are subsumed in the cp_global_trees array, and
106 listed here individually for documentation purposes.
109 tree wchar_decl_node;
111 tree vtable_entry_type;
112 tree delta_type_node;
113 tree __t_desc_type_node;
115 tree class_type_node;
116 tree unknown_type_node;
118 Array type `vtable_entry_type[]'
121 tree vtbl_ptr_type_node;
128 A FUNCTION_DECL which can call `abort'. Not necessarily the
129 one that the user will declare, but sufficient to be called
130 by routines that want to abort the program.
135 tree type_info_type_node, tinfo_decl_id, tinfo_decl_type;
136 tree tinfo_var_id; */
138 tree cp_global_trees
[CPTI_MAX
];
140 /* A list of objects which have constructors or destructors
141 which reside in the global scope. The decl is stored in
142 the TREE_VALUE slot and the initializer is stored
143 in the TREE_PURPOSE slot. */
144 tree static_aggregates
;
146 /* Like static_aggregates, but for thread_local variables. */
151 /* A node for the integer constant 2. */
153 tree integer_two_node
;
155 /* vector of static decls. */
156 vec
<tree
, va_gc
> *static_decls
;
158 /* vector of keyed classes. */
159 vec
<tree
, va_gc
> *keyed_classes
;
161 /* Used only for jumps to as-yet undefined labels, since jumps to
162 defined labels can have their validity checked immediately. */
164 struct GTY((chain_next ("%h.next"))) named_label_use_entry
{
165 struct named_label_use_entry
*next
;
166 /* The binding level to which this entry is *currently* attached.
167 This is initially the binding level in which the goto appeared,
168 but is modified as scopes are closed. */
169 cp_binding_level
*binding_level
;
170 /* The head of the names list that was current when the goto appeared,
171 or the inner scope popped. These are the decls that will *not* be
172 skipped when jumping to the label. */
174 /* The location of the goto, for error reporting. */
175 location_t o_goto_locus
;
176 /* True if an OpenMP structured block scope has been closed since
177 the goto appeared. This means that the branch from the label will
178 illegally exit an OpenMP scope. */
182 /* A list of all LABEL_DECLs in the function that have names. Here so
183 we can clear out their names' definitions at the end of the
184 function, and so we can check the validity of jumps to these labels. */
186 struct GTY((for_user
)) named_label_entry
{
188 tree name
; /* Name of decl. */
190 tree label_decl
; /* LABEL_DECL, unless deleted local label. */
192 named_label_entry
*outer
; /* Outer shadowed chain. */
194 /* The binding level to which the label is *currently* attached.
195 This is initially set to the binding level in which the label
196 is defined, but is modified as scopes are closed. */
197 cp_binding_level
*binding_level
;
199 /* The head of the names list that was current when the label was
200 defined, or the inner scope popped. These are the decls that will
201 be skipped when jumping to the label. */
204 /* A vector of all decls from all binding levels that would be
205 crossed by a backward branch to the label. */
206 vec
<tree
, va_gc
> *bad_decls
;
208 /* A list of uses of the label, before the label is defined. */
209 named_label_use_entry
*uses
;
211 /* The following bits are set after the label is defined, and are
212 updated as scopes are popped. They indicate that a jump to the
213 label will illegally enter a scope of the given flavor. */
217 bool in_transaction_scope
;
218 bool in_constexpr_if
;
221 #define named_labels cp_function_chain->x_named_labels
223 /* The number of function bodies which we are currently processing.
224 (Zero if we are at namespace scope, one inside the body of a
225 function, two inside the body of a function in a local class, etc.) */
228 /* Whether the exception-specifier is part of a function type (i.e. C++17). */
229 bool flag_noexcept_type
;
231 /* States indicating how grokdeclarator() should handle declspecs marked
232 with __attribute__((deprecated)). An object declared as
233 __attribute__((deprecated)) suppresses warnings of uses of other
235 enum deprecated_states deprecated_state
= DEPRECATED_NORMAL
;
238 /* A list of VAR_DECLs whose type was incomplete at the time the
239 variable was declared. */
241 struct GTY(()) incomplete_var
{
243 tree incomplete_type
;
247 static GTY(()) vec
<incomplete_var
, va_gc
> *incomplete_vars
;
249 /* Returns the kind of template specialization we are currently
250 processing, given that it's declaration contained N_CLASS_SCOPES
251 explicit scope qualifications. */
254 current_tmpl_spec_kind (int n_class_scopes
)
256 int n_template_parm_scopes
= 0;
257 int seen_specialization_p
= 0;
258 int innermost_specialization_p
= 0;
261 /* Scan through the template parameter scopes. */
262 for (b
= current_binding_level
;
263 b
->kind
== sk_template_parms
;
266 /* If we see a specialization scope inside a parameter scope,
267 then something is wrong. That corresponds to a declaration
270 template <class T> template <> ...
272 which is always invalid since [temp.expl.spec] forbids the
273 specialization of a class member template if the enclosing
274 class templates are not explicitly specialized as well. */
275 if (b
->explicit_spec_p
)
277 if (n_template_parm_scopes
== 0)
278 innermost_specialization_p
= 1;
280 seen_specialization_p
= 1;
282 else if (seen_specialization_p
== 1)
283 return tsk_invalid_member_spec
;
285 ++n_template_parm_scopes
;
288 /* Handle explicit instantiations. */
289 if (processing_explicit_instantiation
)
291 if (n_template_parm_scopes
!= 0)
292 /* We've seen a template parameter list during an explicit
293 instantiation. For example:
295 template <class T> template void f(int);
297 This is erroneous. */
298 return tsk_invalid_expl_inst
;
300 return tsk_expl_inst
;
303 if (n_template_parm_scopes
< n_class_scopes
)
304 /* We've not seen enough template headers to match all the
305 specialized classes present. For example:
307 template <class T> void R<T>::S<T>::f(int);
309 This is invalid; there needs to be one set of template
310 parameters for each class. */
311 return tsk_insufficient_parms
;
312 else if (n_template_parm_scopes
== n_class_scopes
)
313 /* We're processing a non-template declaration (even though it may
314 be a member of a template class.) For example:
316 template <class T> void S<T>::f(int);
318 The `class T' matches the `S<T>', leaving no template headers
319 corresponding to the `f'. */
321 else if (n_template_parm_scopes
> n_class_scopes
+ 1)
322 /* We've got too many template headers. For example:
324 template <> template <class T> void f (T);
326 There need to be more enclosing classes. */
327 return tsk_excessive_parms
;
329 /* This must be a template. It's of the form:
331 template <class T> template <class U> void S<T>::f(U);
333 This is a specialization if the innermost level was a
334 specialization; otherwise it's just a definition of the
336 return innermost_specialization_p
? tsk_expl_spec
: tsk_template
;
339 /* Exit the current scope. */
347 /* When a label goes out of scope, check to see if that label was used
348 in a valid manner, and issue any appropriate warnings or errors. */
351 check_label_used (tree label
)
353 if (!processing_template_decl
)
355 if (DECL_INITIAL (label
) == NULL_TREE
)
359 error ("label %q+D used but not defined", label
);
360 location
= input_location
;
361 /* FIXME want (LOCATION_FILE (input_location), (line)0) */
362 /* Avoid crashing later. */
363 define_label (location
, DECL_NAME (label
));
366 warn_for_unused_label (label
);
370 /* Helper function to sort named label entries in a vector by DECL_UID. */
373 sort_labels (const void *a
, const void *b
)
375 tree label1
= *(tree
const *) a
;
376 tree label2
= *(tree
const *) b
;
378 /* DECL_UIDs can never be equal. */
379 return DECL_UID (label1
) > DECL_UID (label2
) ? -1 : +1;
382 /* At the end of a function, all labels declared within the function
383 go out of scope. BLOCK is the top-level block for the
387 pop_labels (tree block
)
392 /* We need to add the labels to the block chain, so debug
393 information is emitted. But, we want the order to be stable so
394 need to sort them first. Otherwise the debug output could be
395 randomly ordered. I guess it's mostly stable, unless the hash
396 table implementation changes. */
397 auto_vec
<tree
, 32> labels (named_labels
->elements ());
398 hash_table
<named_label_hash
>::iterator
end (named_labels
->end ());
399 for (hash_table
<named_label_hash
>::iterator iter
400 (named_labels
->begin ()); iter
!= end
; ++iter
)
402 named_label_entry
*ent
= *iter
;
404 gcc_checking_assert (!ent
->outer
);
406 labels
.quick_push (ent
->label_decl
);
410 labels
.qsort (sort_labels
);
412 while (labels
.length ())
414 tree label
= labels
.pop ();
416 DECL_CHAIN (label
) = BLOCK_VARS (block
);
417 BLOCK_VARS (block
) = label
;
419 check_label_used (label
);
423 /* At the end of a block with local labels, restore the outer definition. */
426 pop_local_label (tree id
, tree label
)
428 check_label_used (label
);
429 named_label_entry
**slot
= named_labels
->find_slot_with_hash
430 (id
, IDENTIFIER_HASH_VALUE (id
), NO_INSERT
);
431 named_label_entry
*ent
= *slot
;
437 ent
= ggc_cleared_alloc
<named_label_entry
> ();
443 /* The following two routines are used to interface to Objective-C++.
444 The binding level is purposely treated as an opaque type. */
447 objc_get_current_scope (void)
449 return current_binding_level
;
452 /* The following routine is used by the NeXT-style SJLJ exceptions;
453 variables get marked 'volatile' so as to not be clobbered by
454 _setjmp()/_longjmp() calls. All variables in the current scope,
455 as well as parent scopes up to (but not including) ENCLOSING_BLK
456 shall be thusly marked. */
459 objc_mark_locals_volatile (void *enclosing_blk
)
461 cp_binding_level
*scope
;
463 for (scope
= current_binding_level
;
464 scope
&& scope
!= enclosing_blk
;
465 scope
= scope
->level_chain
)
469 for (decl
= scope
->names
; decl
; decl
= TREE_CHAIN (decl
))
470 objc_volatilize_decl (decl
);
472 /* Do not climb up past the current function. */
473 if (scope
->kind
== sk_function_parms
)
478 /* True if B is the level for the condition of a constexpr if. */
481 level_for_constexpr_if (cp_binding_level
*b
)
483 return (b
->kind
== sk_cond
&& b
->this_entity
484 && TREE_CODE (b
->this_entity
) == IF_STMT
485 && IF_STMT_CONSTEXPR_P (b
->this_entity
));
488 /* Update data for defined and undefined labels when leaving a scope. */
491 poplevel_named_label_1 (named_label_entry
**slot
, cp_binding_level
*bl
)
493 named_label_entry
*ent
= *slot
;
494 cp_binding_level
*obl
= bl
->level_chain
;
496 if (ent
->binding_level
== bl
)
500 /* ENT->NAMES_IN_SCOPE may contain a mixture of DECLs and
501 TREE_LISTs representing OVERLOADs, so be careful. */
502 for (decl
= ent
->names_in_scope
; decl
; decl
= (DECL_P (decl
)
504 : TREE_CHAIN (decl
)))
505 if (decl_jump_unsafe (decl
))
506 vec_safe_push (ent
->bad_decls
, decl
);
508 ent
->binding_level
= obl
;
509 ent
->names_in_scope
= obl
->names
;
513 ent
->in_try_scope
= true;
516 ent
->in_catch_scope
= true;
519 ent
->in_omp_scope
= true;
522 ent
->in_transaction_scope
= true;
525 if (level_for_constexpr_if (bl
->level_chain
))
526 ent
->in_constexpr_if
= true;
534 struct named_label_use_entry
*use
;
536 for (use
= ent
->uses
; use
; use
= use
->next
)
537 if (use
->binding_level
== bl
)
539 use
->binding_level
= obl
;
540 use
->names_in_scope
= obl
->names
;
541 if (bl
->kind
== sk_omp
)
542 use
->in_omp_scope
= true;
549 /* Saved errorcount to avoid -Wunused-but-set-{parameter,variable} warnings
550 when errors were reported, except for -Werror-unused-but-set-*. */
551 static int unused_but_set_errorcount
;
553 /* Exit a binding level.
554 Pop the level off, and restore the state of the identifier-decl mappings
555 that were in effect when this level was entered.
557 If KEEP == 1, this level had explicit declarations, so
558 and create a "block" (a BLOCK node) for the level
559 to record its declarations and subblocks for symbol table output.
561 If FUNCTIONBODY is nonzero, this level is the body of a function,
562 so create a block as if KEEP were set and also clear out all
565 If REVERSE is nonzero, reverse the order of decls before putting
566 them into the BLOCK. */
569 poplevel (int keep
, int reverse
, int functionbody
)
572 /* The chain of decls was accumulated in reverse order.
573 Put it into forward order, just for cleanliness. */
580 bool subtime
= timevar_cond_start (TV_NAME_LOOKUP
);
585 gcc_assert (current_binding_level
->kind
!= sk_class
586 && current_binding_level
->kind
!= sk_namespace
);
588 if (current_binding_level
->kind
== sk_cleanup
)
590 subblocks
= functionbody
>= 0 ? current_binding_level
->blocks
: 0;
592 gcc_assert (!vec_safe_length (current_binding_level
->class_shadowed
));
594 /* We used to use KEEP == 2 to indicate that the new block should go
595 at the beginning of the list of blocks at this binding level,
596 rather than the end. This hack is no longer used. */
597 gcc_assert (keep
== 0 || keep
== 1);
599 if (current_binding_level
->keep
)
602 /* Any uses of undefined labels, and any defined labels, now operate
603 under constraints of next binding contour. */
604 if (cfun
&& !functionbody
&& named_labels
)
605 named_labels
->traverse
<cp_binding_level
*, poplevel_named_label_1
>
606 (current_binding_level
);
608 /* Get the decls in the order they were written.
609 Usually current_binding_level->names is in reverse order.
610 But parameter decls were previously put in forward order. */
612 decls
= current_binding_level
->names
;
615 decls
= nreverse (decls
);
616 current_binding_level
->names
= decls
;
619 /* If there were any declarations or structure tags in that level,
620 or if this level is a function body,
621 create a BLOCK to record them for the life of this function. */
623 /* Avoid function body block if possible. */
624 if (functionbody
&& subblocks
&& BLOCK_CHAIN (subblocks
) == NULL_TREE
)
626 else if (keep
== 1 || functionbody
)
627 block
= make_node (BLOCK
);
628 if (block
!= NULL_TREE
)
630 BLOCK_VARS (block
) = decls
;
631 BLOCK_SUBBLOCKS (block
) = subblocks
;
634 /* In each subblock, record that this is its superior. */
636 for (link
= subblocks
; link
; link
= BLOCK_CHAIN (link
))
637 BLOCK_SUPERCONTEXT (link
) = block
;
639 /* Before we remove the declarations first check for unused variables. */
640 if ((warn_unused_variable
|| warn_unused_but_set_variable
)
641 && current_binding_level
->kind
!= sk_template_parms
642 && !processing_template_decl
)
643 for (tree d
= get_local_decls (); d
; d
= TREE_CHAIN (d
))
645 /* There are cases where D itself is a TREE_LIST. See in
646 push_local_binding where the list of decls returned by
647 getdecls is built. */
648 decl
= TREE_CODE (d
) == TREE_LIST
? TREE_VALUE (d
) : d
;
650 tree type
= TREE_TYPE (decl
);
652 && (! TREE_USED (decl
) || !DECL_READ_P (decl
))
653 && ! DECL_IN_SYSTEM_HEADER (decl
)
654 /* For structured bindings, consider only real variables, not
656 && (DECL_DECOMPOSITION_P (decl
) ? !DECL_DECOMP_BASE (decl
)
657 : (DECL_NAME (decl
) && !DECL_ARTIFICIAL (decl
)))
658 && type
!= error_mark_node
659 && (!CLASS_TYPE_P (type
)
660 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
)
661 || lookup_attribute ("warn_unused",
662 TYPE_ATTRIBUTES (TREE_TYPE (decl
)))))
664 if (! TREE_USED (decl
))
666 if (!DECL_NAME (decl
) && DECL_DECOMPOSITION_P (decl
))
667 warning_at (DECL_SOURCE_LOCATION (decl
),
668 OPT_Wunused_variable
,
669 "unused structured binding declaration");
671 warning_at (DECL_SOURCE_LOCATION (decl
),
672 OPT_Wunused_variable
, "unused variable %qD", decl
);
674 else if (DECL_CONTEXT (decl
) == current_function_decl
675 // For -Wunused-but-set-variable leave references alone.
676 && !TYPE_REF_P (TREE_TYPE (decl
))
677 && errorcount
== unused_but_set_errorcount
)
679 if (!DECL_NAME (decl
) && DECL_DECOMPOSITION_P (decl
))
680 warning_at (DECL_SOURCE_LOCATION (decl
),
681 OPT_Wunused_but_set_variable
, "structured "
682 "binding declaration set but not used");
684 warning_at (DECL_SOURCE_LOCATION (decl
),
685 OPT_Wunused_but_set_variable
,
686 "variable %qD set but not used", decl
);
687 unused_but_set_errorcount
= errorcount
;
692 /* Remove declarations for all the DECLs in this level. */
693 for (link
= decls
; link
; link
= TREE_CHAIN (link
))
695 decl
= TREE_CODE (link
) == TREE_LIST
? TREE_VALUE (link
) : link
;
696 tree name
= OVL_NAME (decl
);
698 /* Remove the binding. */
699 if (TREE_CODE (decl
) == LABEL_DECL
)
700 pop_local_label (name
, decl
);
702 pop_local_binding (name
, decl
);
705 /* Restore the IDENTIFIER_TYPE_VALUEs. */
706 for (link
= current_binding_level
->type_shadowed
;
707 link
; link
= TREE_CHAIN (link
))
708 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (link
), TREE_VALUE (link
));
710 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
711 list if a `using' declaration put them there. The debugging
712 back ends won't understand OVERLOAD, so we remove them here.
713 Because the BLOCK_VARS are (temporarily) shared with
714 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
715 popped all the bindings. Also remove undeduced 'auto' decls,
716 which LTO doesn't understand, and can't have been used by anything. */
721 for (d
= &BLOCK_VARS (block
); *d
; )
723 if (TREE_CODE (*d
) == TREE_LIST
724 || (!processing_template_decl
725 && undeduced_auto_decl (*d
)))
726 *d
= TREE_CHAIN (*d
);
728 d
= &DECL_CHAIN (*d
);
732 /* If the level being exited is the top level of a function,
733 check over all the labels. */
738 /* Since this is the top level block of a function, the vars are
739 the function's parameters. Don't leave them in the BLOCK
740 because they are found in the FUNCTION_DECL instead. */
741 BLOCK_VARS (block
) = 0;
745 pop_labels (subblocks
);
748 kind
= current_binding_level
->kind
;
749 if (kind
== sk_cleanup
)
753 /* If this is a temporary binding created for a cleanup, then we'll
754 have pushed a statement list level. Pop that, create a new
755 BIND_EXPR for the block, and insert it into the stream. */
756 stmt
= pop_stmt_list (current_binding_level
->statement_list
);
757 stmt
= c_build_bind_expr (input_location
, block
, stmt
);
764 /* The current function is being defined, so its DECL_INITIAL
765 should be error_mark_node. */
766 gcc_assert (DECL_INITIAL (current_function_decl
) == error_mark_node
);
767 DECL_INITIAL (current_function_decl
) = block
? block
: subblocks
;
770 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl
))
772 if (BLOCK_SUBBLOCKS (subblocks
))
773 BLOCK_OUTER_CURLY_BRACE_P (BLOCK_SUBBLOCKS (subblocks
)) = 1;
776 BLOCK_OUTER_CURLY_BRACE_P (subblocks
) = 1;
780 current_binding_level
->blocks
781 = block_chainon (current_binding_level
->blocks
, block
);
783 /* If we did not make a block for the level just exited,
784 any blocks made for inner levels
785 (since they cannot be recorded as subblocks in that level)
786 must be carried forward so they will later become subblocks
787 of something else. */
789 current_binding_level
->blocks
790 = block_chainon (current_binding_level
->blocks
, subblocks
);
792 /* Each and every BLOCK node created here in `poplevel' is important
793 (e.g. for proper debugging information) so if we created one
794 earlier, mark it as "used". */
796 TREE_USED (block
) = 1;
798 /* All temporary bindings created for cleanups are popped silently. */
799 if (kind
== sk_cleanup
)
802 timevar_cond_stop (TV_NAME_LOOKUP
, subtime
);
806 /* Call wrapup_globals_declarations for the globals in NAMESPACE. */
807 /* Diagnose odr-used extern inline variables without definitions
808 in the current TU. */
811 wrapup_namespace_globals ()
813 if (vec
<tree
, va_gc
> *statics
= static_decls
)
817 FOR_EACH_VEC_ELT (*statics
, i
, decl
)
819 if (warn_unused_function
820 && TREE_CODE (decl
) == FUNCTION_DECL
821 && DECL_INITIAL (decl
) == 0
822 && DECL_EXTERNAL (decl
)
823 && !TREE_PUBLIC (decl
)
824 && !DECL_ARTIFICIAL (decl
)
825 && !DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl
)
826 && !TREE_NO_WARNING (decl
))
827 warning_at (DECL_SOURCE_LOCATION (decl
),
828 OPT_Wunused_function
,
829 "%qF declared %<static%> but never defined", decl
);
832 && DECL_EXTERNAL (decl
)
833 && DECL_INLINE_VAR_P (decl
)
834 && DECL_ODR_USED (decl
))
835 error_at (DECL_SOURCE_LOCATION (decl
),
836 "odr-used inline variable %qD is not defined", decl
);
839 /* Clear out the list, so we don't rescan next time. */
842 /* Write out any globals that need to be output. */
843 return wrapup_global_declarations (statics
->address (),
849 /* In C++, you don't have to write `struct S' to refer to `S'; you
850 can just use `S'. We accomplish this by creating a TYPE_DECL as
851 if the user had written `typedef struct S S'. Create and return
852 the TYPE_DECL for TYPE. */
855 create_implicit_typedef (tree name
, tree type
)
859 decl
= build_decl (input_location
, TYPE_DECL
, name
, type
);
860 DECL_ARTIFICIAL (decl
) = 1;
861 /* There are other implicit type declarations, like the one *within*
862 a class that allows you to write `S::S'. We must distinguish
864 SET_DECL_IMPLICIT_TYPEDEF_P (decl
);
865 TYPE_NAME (type
) = decl
;
866 TYPE_STUB_DECL (type
) = decl
;
871 /* Function-scope local entities that need discriminators. Each entry
872 is a {decl,name} pair. VAR_DECLs for anon unions get their name
873 smashed, so we cannot rely on DECL_NAME. */
875 static GTY((deletable
)) vec
<tree
, va_gc
> *local_entities
;
877 /* Determine the mangling discriminator of local DECL. There are
878 generally very few of these in any particular function. */
881 determine_local_discriminator (tree decl
)
883 bool subtime
= timevar_cond_start (TV_NAME_LOOKUP
);
884 retrofit_lang_decl (decl
);
885 tree ctx
= DECL_CONTEXT (decl
);
886 tree name
= (TREE_CODE (decl
) == TYPE_DECL
887 && TYPE_UNNAMED_P (TREE_TYPE (decl
))
888 ? NULL_TREE
: DECL_NAME (decl
));
889 size_t nelts
= vec_safe_length (local_entities
);
890 for (size_t i
= 0; i
< nelts
; i
+= 2)
892 tree
*pair
= &(*local_entities
)[i
];
895 gcc_checking_assert (d
!= decl
);
897 && TREE_CODE (decl
) == TREE_CODE (d
)
898 && ctx
== DECL_CONTEXT (d
))
900 tree disc
= integer_one_node
;
901 if (DECL_DISCRIMINATOR (d
))
902 disc
= build_int_cst (TREE_TYPE (disc
),
903 TREE_INT_CST_LOW (DECL_DISCRIMINATOR (d
)) + 1);
904 DECL_DISCRIMINATOR (decl
) = disc
;
905 /* Replace the saved decl. */
914 vec_safe_reserve (local_entities
, 2);
915 local_entities
->quick_push (decl
);
916 local_entities
->quick_push (name
);
919 timevar_cond_stop (TV_NAME_LOOKUP
, subtime
);
923 /* Subroutine of duplicate_decls: return truthvalue of whether
924 or not types of these decls match.
926 For C++, we must compare the parameter list so that `int' can match
927 `int&' in a parameter position, but `int&' is not confused with
931 decls_match (tree newdecl
, tree olddecl
, bool record_versions
/* = true */)
935 if (newdecl
== olddecl
)
938 if (TREE_CODE (newdecl
) != TREE_CODE (olddecl
))
939 /* If the two DECLs are not even the same kind of thing, we're not
940 interested in their types. */
943 gcc_assert (DECL_P (newdecl
));
945 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
947 tree f1
= TREE_TYPE (newdecl
);
948 tree f2
= TREE_TYPE (olddecl
);
949 tree p1
= TYPE_ARG_TYPES (f1
);
950 tree p2
= TYPE_ARG_TYPES (f2
);
953 /* Specializations of different templates are different functions
954 even if they have the same type. */
955 tree t1
= (DECL_USE_TEMPLATE (newdecl
)
956 ? DECL_TI_TEMPLATE (newdecl
)
958 tree t2
= (DECL_USE_TEMPLATE (olddecl
)
959 ? DECL_TI_TEMPLATE (olddecl
)
964 if (CP_DECL_CONTEXT (newdecl
) != CP_DECL_CONTEXT (olddecl
)
965 && ! (DECL_EXTERN_C_P (newdecl
)
966 && DECL_EXTERN_C_P (olddecl
)))
969 /* A new declaration doesn't match a built-in one unless it
970 is also extern "C". */
971 if (DECL_IS_BUILTIN (olddecl
)
972 && DECL_EXTERN_C_P (olddecl
) && !DECL_EXTERN_C_P (newdecl
))
975 if (TREE_CODE (f1
) != TREE_CODE (f2
))
978 /* A declaration with deduced return type should use its pre-deduction
979 type for declaration matching. */
980 r2
= fndecl_declared_return_type (olddecl
);
982 if (same_type_p (TREE_TYPE (f1
), r2
))
984 if (!prototype_p (f2
) && DECL_EXTERN_C_P (olddecl
)
985 && fndecl_built_in_p (olddecl
))
987 types_match
= self_promoting_args_p (p1
);
988 if (p1
== void_list_node
)
989 TREE_TYPE (newdecl
) = TREE_TYPE (olddecl
);
994 && type_memfn_rqual (f1
) == type_memfn_rqual (f2
)
995 && (TYPE_ATTRIBUTES (TREE_TYPE (newdecl
)) == NULL_TREE
996 || comp_type_attributes (TREE_TYPE (newdecl
),
997 TREE_TYPE (olddecl
)) != 0);
1002 /* The decls dont match if they correspond to two different versions
1003 of the same function. Disallow extern "C" functions to be
1004 versions for now. */
1006 && !DECL_EXTERN_C_P (newdecl
)
1007 && !DECL_EXTERN_C_P (olddecl
)
1009 && maybe_version_functions (newdecl
, olddecl
,
1010 (!DECL_FUNCTION_VERSIONED (newdecl
)
1011 || !DECL_FUNCTION_VERSIONED (olddecl
))))
1014 else if (TREE_CODE (newdecl
) == TEMPLATE_DECL
)
1016 tree oldres
= DECL_TEMPLATE_RESULT (olddecl
);
1017 tree newres
= DECL_TEMPLATE_RESULT (newdecl
);
1019 if (TREE_CODE (newres
) != TREE_CODE (oldres
))
1022 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl
),
1023 DECL_TEMPLATE_PARMS (olddecl
)))
1026 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) == TYPE_DECL
)
1027 types_match
= (same_type_p (TREE_TYPE (oldres
), TREE_TYPE (newres
))
1028 && equivalently_constrained (olddecl
, newdecl
));
1030 // We don't need to check equivalently_constrained for variable and
1031 // function templates because we check it on the results.
1032 types_match
= decls_match (oldres
, newres
);
1036 /* Need to check scope for variable declaration (VAR_DECL).
1037 For typedef (TYPE_DECL), scope is ignored. */
1039 && CP_DECL_CONTEXT (newdecl
) != CP_DECL_CONTEXT (olddecl
)
1041 Two declarations for an object with C language linkage
1042 with the same name (ignoring the namespace that qualify
1043 it) that appear in different namespace scopes refer to
1045 && !(DECL_EXTERN_C_P (olddecl
) && DECL_EXTERN_C_P (newdecl
)))
1048 if (TREE_TYPE (newdecl
) == error_mark_node
)
1049 types_match
= TREE_TYPE (olddecl
) == error_mark_node
;
1050 else if (TREE_TYPE (olddecl
) == NULL_TREE
)
1051 types_match
= TREE_TYPE (newdecl
) == NULL_TREE
;
1052 else if (TREE_TYPE (newdecl
) == NULL_TREE
)
1055 types_match
= comptypes (TREE_TYPE (newdecl
),
1056 TREE_TYPE (olddecl
),
1057 COMPARE_REDECLARATION
);
1060 // Normal functions can be constrained, as can variable partial
1062 if (types_match
&& VAR_OR_FUNCTION_DECL_P (newdecl
))
1063 types_match
= equivalently_constrained (newdecl
, olddecl
);
1068 /* NEWDECL and OLDDECL have identical signatures. If they are
1069 different versions adjust them and return true.
1070 If RECORD is set to true, record function versions. */
1073 maybe_version_functions (tree newdecl
, tree olddecl
, bool record
)
1075 if (!targetm
.target_option
.function_versions (newdecl
, olddecl
))
1078 if (!DECL_FUNCTION_VERSIONED (olddecl
))
1080 DECL_FUNCTION_VERSIONED (olddecl
) = 1;
1081 if (DECL_ASSEMBLER_NAME_SET_P (olddecl
))
1082 mangle_decl (olddecl
);
1085 if (!DECL_FUNCTION_VERSIONED (newdecl
))
1087 DECL_FUNCTION_VERSIONED (newdecl
) = 1;
1088 if (DECL_ASSEMBLER_NAME_SET_P (newdecl
))
1089 mangle_decl (newdecl
);
1093 cgraph_node::record_function_versions (olddecl
, newdecl
);
1098 /* If NEWDECL is `static' and an `extern' was seen previously,
1099 warn about it. OLDDECL is the previous declaration.
1101 Note that this does not apply to the C++ case of declaring
1102 a variable `extern const' and then later `const'.
1104 Don't complain about built-in functions, since they are beyond
1105 the user's control. */
1108 warn_extern_redeclared_static (tree newdecl
, tree olddecl
)
1110 if (TREE_CODE (newdecl
) == TYPE_DECL
1111 || TREE_CODE (newdecl
) == TEMPLATE_DECL
1112 || TREE_CODE (newdecl
) == CONST_DECL
1113 || TREE_CODE (newdecl
) == NAMESPACE_DECL
)
1116 /* Don't get confused by static member functions; that's a different
1118 if (TREE_CODE (newdecl
) == FUNCTION_DECL
1119 && DECL_STATIC_FUNCTION_P (newdecl
))
1122 /* If the old declaration was `static', or the new one isn't, then
1123 everything is OK. */
1124 if (DECL_THIS_STATIC (olddecl
) || !DECL_THIS_STATIC (newdecl
))
1127 /* It's OK to declare a builtin function as `static'. */
1128 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1129 && DECL_ARTIFICIAL (olddecl
))
1132 auto_diagnostic_group d
;
1133 if (permerror (DECL_SOURCE_LOCATION (newdecl
),
1134 "%qD was declared %<extern%> and later %<static%>", newdecl
))
1135 inform (DECL_SOURCE_LOCATION (olddecl
),
1136 "previous declaration of %qD", olddecl
);
1139 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1140 function templates. If their exception specifications do not
1141 match, issue a diagnostic. */
1144 check_redeclaration_exception_specification (tree new_decl
,
1147 tree new_exceptions
= TYPE_RAISES_EXCEPTIONS (TREE_TYPE (new_decl
));
1148 tree old_exceptions
= TYPE_RAISES_EXCEPTIONS (TREE_TYPE (old_decl
));
1150 /* Two default specs are equivalent, don't force evaluation. */
1151 if (UNEVALUATED_NOEXCEPT_SPEC_P (new_exceptions
)
1152 && UNEVALUATED_NOEXCEPT_SPEC_P (old_exceptions
))
1155 if (!type_dependent_expression_p (old_decl
))
1157 maybe_instantiate_noexcept (new_decl
);
1158 maybe_instantiate_noexcept (old_decl
);
1160 new_exceptions
= TYPE_RAISES_EXCEPTIONS (TREE_TYPE (new_decl
));
1161 old_exceptions
= TYPE_RAISES_EXCEPTIONS (TREE_TYPE (old_decl
));
1165 If any declaration of a function has an exception-specification,
1166 all declarations, including the definition and an explicit
1167 specialization, of that function shall have an
1168 exception-specification with the same set of type-ids. */
1169 if (! DECL_IS_BUILTIN (old_decl
)
1170 && !comp_except_specs (new_exceptions
, old_exceptions
, ce_normal
))
1172 const char *const msg
1173 = G_("declaration of %qF has a different exception specifier");
1174 bool complained
= true;
1175 location_t new_loc
= DECL_SOURCE_LOCATION (new_decl
);
1176 auto_diagnostic_group d
;
1177 if (DECL_IN_SYSTEM_HEADER (old_decl
))
1178 complained
= pedwarn (new_loc
, OPT_Wsystem_headers
, msg
, new_decl
);
1179 else if (!flag_exceptions
)
1180 /* We used to silently permit mismatched eh specs with
1181 -fno-exceptions, so make them a pedwarn now. */
1182 complained
= pedwarn (new_loc
, OPT_Wpedantic
, msg
, new_decl
);
1184 error_at (new_loc
, msg
, new_decl
);
1186 inform (DECL_SOURCE_LOCATION (old_decl
),
1187 "from previous declaration %qF", old_decl
);
1191 /* Return true if OLD_DECL and NEW_DECL agree on constexprness.
1192 Otherwise issue diagnostics. */
1195 validate_constexpr_redeclaration (tree old_decl
, tree new_decl
)
1197 old_decl
= STRIP_TEMPLATE (old_decl
);
1198 new_decl
= STRIP_TEMPLATE (new_decl
);
1199 if (!VAR_OR_FUNCTION_DECL_P (old_decl
)
1200 || !VAR_OR_FUNCTION_DECL_P (new_decl
))
1202 if (DECL_DECLARED_CONSTEXPR_P (old_decl
)
1203 == DECL_DECLARED_CONSTEXPR_P (new_decl
))
1205 if (TREE_CODE (old_decl
) == FUNCTION_DECL
)
1207 if (fndecl_built_in_p (old_decl
))
1209 /* Hide a built-in declaration. */
1210 DECL_DECLARED_CONSTEXPR_P (old_decl
)
1211 = DECL_DECLARED_CONSTEXPR_P (new_decl
);
1214 /* 7.1.5 [dcl.constexpr]
1215 Note: An explicit specialization can differ from the template
1216 declaration with respect to the constexpr specifier. */
1217 if (! DECL_TEMPLATE_SPECIALIZATION (old_decl
)
1218 && DECL_TEMPLATE_SPECIALIZATION (new_decl
))
1221 error_at (DECL_SOURCE_LOCATION (new_decl
),
1222 "redeclaration %qD differs in %<constexpr%> "
1223 "from previous declaration", new_decl
);
1224 inform (DECL_SOURCE_LOCATION (old_decl
),
1225 "previous declaration %qD", old_decl
);
1231 // If OLDDECL and NEWDECL are concept declarations with the same type
1232 // (i.e., and template parameters), but different requirements,
1233 // emit diagnostics and return true. Otherwise, return false.
1235 check_concept_refinement (tree olddecl
, tree newdecl
)
1237 if (!DECL_DECLARED_CONCEPT_P (olddecl
) || !DECL_DECLARED_CONCEPT_P (newdecl
))
1240 tree d1
= DECL_TEMPLATE_RESULT (olddecl
);
1241 tree d2
= DECL_TEMPLATE_RESULT (newdecl
);
1242 if (TREE_CODE (d1
) != TREE_CODE (d2
))
1245 tree t1
= TREE_TYPE (d1
);
1246 tree t2
= TREE_TYPE (d2
);
1247 if (TREE_CODE (d1
) == FUNCTION_DECL
)
1249 if (compparms (TYPE_ARG_TYPES (t1
), TYPE_ARG_TYPES (t2
))
1250 && comp_template_parms (DECL_TEMPLATE_PARMS (olddecl
),
1251 DECL_TEMPLATE_PARMS (newdecl
))
1252 && !equivalently_constrained (olddecl
, newdecl
))
1254 error ("cannot specialize concept %q#D", olddecl
);
1261 /* DECL is a redeclaration of a function or function template. If
1262 it does have default arguments issue a diagnostic. Note: this
1263 function is used to enforce the requirements in C++11 8.3.6 about
1264 no default arguments in redeclarations. */
1267 check_redeclaration_no_default_args (tree decl
)
1269 gcc_assert (DECL_DECLARES_FUNCTION_P (decl
));
1271 for (tree t
= FUNCTION_FIRST_USER_PARMTYPE (decl
);
1272 t
&& t
!= void_list_node
; t
= TREE_CHAIN (t
))
1273 if (TREE_PURPOSE (t
))
1275 permerror (DECL_SOURCE_LOCATION (decl
),
1276 "redeclaration of %q#D may not have default "
1282 /* NEWDECL is a redeclaration of a function or function template OLDDECL,
1283 in any case represented as FUNCTION_DECLs (the DECL_TEMPLATE_RESULTs of
1284 the TEMPLATE_DECLs in case of function templates). This function is used
1285 to enforce the final part of C++17 11.3.6/4, about a single declaration:
1286 "If a friend declaration specifies a default argument expression, that
1287 declaration shall be a definition and shall be the only declaration of
1288 the function or function template in the translation unit." */
1291 check_no_redeclaration_friend_default_args (tree olddecl
, tree newdecl
,
1292 bool olddecl_hidden_friend_p
)
1294 if (!olddecl_hidden_friend_p
&& !DECL_FRIEND_P (newdecl
))
1297 tree t1
= FUNCTION_FIRST_USER_PARMTYPE (olddecl
);
1298 tree t2
= FUNCTION_FIRST_USER_PARMTYPE (newdecl
);
1300 for (; t1
&& t1
!= void_list_node
;
1301 t1
= TREE_CHAIN (t1
), t2
= TREE_CHAIN (t2
))
1302 if ((olddecl_hidden_friend_p
&& TREE_PURPOSE (t1
))
1303 || (DECL_FRIEND_P (newdecl
) && TREE_PURPOSE (t2
)))
1305 auto_diagnostic_group d
;
1306 if (permerror (DECL_SOURCE_LOCATION (newdecl
),
1307 "friend declaration of %q#D specifies default "
1308 "arguments and isn't the only declaration", newdecl
))
1309 inform (DECL_SOURCE_LOCATION (olddecl
),
1310 "previous declaration of %q#D", olddecl
);
1315 /* Merge tree bits that correspond to attributes noreturn, nothrow,
1316 const, malloc, and pure from NEWDECL with those of OLDDECL. */
1319 merge_attribute_bits (tree newdecl
, tree olddecl
)
1321 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
1322 TREE_THIS_VOLATILE (olddecl
) |= TREE_THIS_VOLATILE (newdecl
);
1323 TREE_NOTHROW (newdecl
) |= TREE_NOTHROW (olddecl
);
1324 TREE_NOTHROW (olddecl
) |= TREE_NOTHROW (newdecl
);
1325 TREE_READONLY (newdecl
) |= TREE_READONLY (olddecl
);
1326 TREE_READONLY (olddecl
) |= TREE_READONLY (newdecl
);
1327 DECL_IS_MALLOC (newdecl
) |= DECL_IS_MALLOC (olddecl
);
1328 DECL_IS_MALLOC (olddecl
) |= DECL_IS_MALLOC (newdecl
);
1329 DECL_PURE_P (newdecl
) |= DECL_PURE_P (olddecl
);
1330 DECL_PURE_P (olddecl
) |= DECL_PURE_P (newdecl
);
1331 DECL_UNINLINABLE (newdecl
) |= DECL_UNINLINABLE (olddecl
);
1332 DECL_UNINLINABLE (olddecl
) |= DECL_UNINLINABLE (newdecl
);
1335 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1336 && lookup_attribute ("gnu_inline", \
1337 DECL_ATTRIBUTES (fn)))
1339 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1340 If the redeclaration is invalid, a diagnostic is issued, and the
1341 error_mark_node is returned. Otherwise, OLDDECL is returned.
1343 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1346 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1349 duplicate_decls (tree newdecl
, tree olddecl
, bool newdecl_is_friend
)
1351 unsigned olddecl_uid
= DECL_UID (olddecl
);
1352 int olddecl_friend
= 0, types_match
= 0, hidden_friend
= 0;
1353 int olddecl_hidden_friend
= 0;
1354 int new_defines_function
= 0;
1355 tree new_template_info
;
1356 location_t olddecl_loc
= DECL_SOURCE_LOCATION (olddecl
);
1357 location_t newdecl_loc
= DECL_SOURCE_LOCATION (newdecl
);
1359 if (newdecl
== olddecl
)
1362 types_match
= decls_match (newdecl
, olddecl
);
1364 /* If either the type of the new decl or the type of the old decl is an
1365 error_mark_node, then that implies that we have already issued an
1366 error (earlier) for some bogus type specification, and in that case,
1367 it is rather pointless to harass the user with yet more error message
1368 about the same declaration, so just pretend the types match here. */
1369 if (TREE_TYPE (newdecl
) == error_mark_node
1370 || TREE_TYPE (olddecl
) == error_mark_node
)
1371 return error_mark_node
;
1373 /* Check for redeclaration and other discrepancies. */
1374 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1375 && DECL_ARTIFICIAL (olddecl
))
1377 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl
));
1378 if (TREE_CODE (newdecl
) != FUNCTION_DECL
)
1380 /* Avoid warnings redeclaring built-ins which have not been
1381 explicitly declared. */
1382 if (DECL_ANTICIPATED (olddecl
))
1384 if (TREE_PUBLIC (newdecl
)
1385 && CP_DECL_CONTEXT (newdecl
) == global_namespace
)
1386 warning_at (newdecl_loc
,
1387 OPT_Wbuiltin_declaration_mismatch
,
1388 "built-in function %qD declared as non-function",
1393 /* If you declare a built-in or predefined function name as static,
1394 the old definition is overridden, but optionally warn this was a
1395 bad choice of name. */
1396 if (! TREE_PUBLIC (newdecl
))
1398 warning_at (newdecl_loc
,
1400 fndecl_built_in_p (olddecl
)
1401 ? G_("shadowing built-in function %q#D")
1402 : G_("shadowing library function %q#D"), olddecl
);
1403 /* Discard the old built-in function. */
1406 /* If the built-in is not ansi, then programs can override
1407 it even globally without an error. */
1408 else if (! fndecl_built_in_p (olddecl
))
1409 warning_at (newdecl_loc
, 0,
1410 "library function %q#D redeclared as non-function %q#D",
1413 error_at (newdecl_loc
,
1414 "declaration of %q#D conflicts with built-in "
1415 "declaration %q#D", newdecl
, olddecl
);
1418 else if (DECL_OMP_DECLARE_REDUCTION_P (olddecl
))
1420 gcc_assert (DECL_OMP_DECLARE_REDUCTION_P (newdecl
));
1421 error_at (newdecl_loc
,
1422 "redeclaration of %<pragma omp declare reduction%>");
1423 inform (olddecl_loc
,
1424 "previous %<pragma omp declare reduction%> declaration");
1425 return error_mark_node
;
1427 else if (!types_match
)
1429 /* Avoid warnings redeclaring built-ins which have not been
1430 explicitly declared. */
1431 if (DECL_ANTICIPATED (olddecl
))
1435 /* A new declaration doesn't match a built-in one unless it
1436 is also extern "C". */
1437 gcc_assert (DECL_IS_BUILTIN (olddecl
));
1438 gcc_assert (DECL_EXTERN_C_P (olddecl
));
1439 if (!DECL_EXTERN_C_P (newdecl
))
1442 for (t1
= TYPE_ARG_TYPES (TREE_TYPE (newdecl
)),
1443 t2
= TYPE_ARG_TYPES (TREE_TYPE (olddecl
));
1445 t1
= TREE_CHAIN (t1
), t2
= TREE_CHAIN (t2
))
1449 /* FILE, tm types are not known at the time
1450 we create the builtins. */
1451 for (unsigned i
= 0;
1452 i
< sizeof (builtin_structptr_types
)
1453 / sizeof (builtin_structptr_type
);
1455 if (TREE_VALUE (t2
) == builtin_structptr_types
[i
].node
)
1457 tree t
= TREE_VALUE (t1
);
1460 && TYPE_IDENTIFIER (TREE_TYPE (t
))
1461 == get_identifier (builtin_structptr_types
[i
].str
)
1462 && compparms (TREE_CHAIN (t1
), TREE_CHAIN (t2
)))
1464 tree oldargs
= TYPE_ARG_TYPES (TREE_TYPE (olddecl
));
1466 TYPE_ARG_TYPES (TREE_TYPE (olddecl
))
1467 = TYPE_ARG_TYPES (TREE_TYPE (newdecl
));
1468 types_match
= decls_match (newdecl
, olddecl
);
1470 return duplicate_decls (newdecl
, olddecl
,
1472 TYPE_ARG_TYPES (TREE_TYPE (olddecl
)) = oldargs
;
1477 if (! same_type_p (TREE_VALUE (t1
), TREE_VALUE (t2
)))
1482 warning_at (newdecl_loc
,
1483 OPT_Wbuiltin_declaration_mismatch
,
1484 "declaration of %q#D conflicts with built-in "
1485 "declaration %q#D", newdecl
, olddecl
);
1487 else if ((DECL_EXTERN_C_P (newdecl
)
1488 && DECL_EXTERN_C_P (olddecl
))
1489 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl
)),
1490 TYPE_ARG_TYPES (TREE_TYPE (olddecl
))))
1492 /* Don't really override olddecl for __* prefixed builtins
1493 except for __[^b]*_chk, the compiler might be using those
1495 if (fndecl_built_in_p (olddecl
))
1497 tree id
= DECL_NAME (olddecl
);
1498 const char *name
= IDENTIFIER_POINTER (id
);
1503 && (strncmp (name
+ 2, "builtin_",
1504 strlen ("builtin_")) == 0
1505 || (len
= strlen (name
)) <= strlen ("___chk")
1506 || memcmp (name
+ len
- strlen ("_chk"),
1507 "_chk", strlen ("_chk") + 1) != 0))
1509 if (DECL_INITIAL (newdecl
))
1511 error_at (newdecl_loc
,
1512 "definition of %q#D ambiguates built-in "
1513 "declaration %q#D", newdecl
, olddecl
);
1514 return error_mark_node
;
1516 auto_diagnostic_group d
;
1517 if (permerror (newdecl_loc
,
1518 "new declaration %q#D ambiguates built-in"
1519 " declaration %q#D", newdecl
, olddecl
)
1521 inform (newdecl_loc
,
1522 "ignoring the %q#D declaration", newdecl
);
1523 return flag_permissive
? olddecl
: error_mark_node
;
1527 /* A near match; override the builtin. */
1529 if (TREE_PUBLIC (newdecl
))
1530 warning_at (newdecl_loc
,
1531 OPT_Wbuiltin_declaration_mismatch
,
1532 "new declaration %q#D ambiguates built-in "
1533 "declaration %q#D", newdecl
, olddecl
);
1535 warning (OPT_Wshadow
,
1536 fndecl_built_in_p (olddecl
)
1537 ? G_("shadowing built-in function %q#D")
1538 : G_("shadowing library function %q#D"), olddecl
);
1541 /* Discard the old built-in function. */
1544 /* Replace the old RTL to avoid problems with inlining. */
1545 COPY_DECL_RTL (newdecl
, olddecl
);
1547 /* Even if the types match, prefer the new declarations type for
1548 built-ins which have not been explicitly declared, for
1549 exception lists, etc... */
1550 else if (DECL_IS_BUILTIN (olddecl
))
1552 tree type
= TREE_TYPE (newdecl
);
1553 tree attribs
= (*targetm
.merge_type_attributes
)
1554 (TREE_TYPE (olddecl
), type
);
1556 type
= cp_build_type_attribute_variant (type
, attribs
);
1557 TREE_TYPE (newdecl
) = TREE_TYPE (olddecl
) = type
;
1560 /* If a function is explicitly declared "throw ()", propagate that to
1561 the corresponding builtin. */
1562 if (DECL_BUILT_IN_CLASS (olddecl
) == BUILT_IN_NORMAL
1563 && DECL_ANTICIPATED (olddecl
)
1564 && TREE_NOTHROW (newdecl
)
1565 && !TREE_NOTHROW (olddecl
))
1567 enum built_in_function fncode
= DECL_FUNCTION_CODE (olddecl
);
1568 tree tmpdecl
= builtin_decl_explicit (fncode
);
1569 if (tmpdecl
&& tmpdecl
!= olddecl
&& types_match
)
1570 TREE_NOTHROW (tmpdecl
) = 1;
1573 /* Whether or not the builtin can throw exceptions has no
1574 bearing on this declarator. */
1575 TREE_NOTHROW (olddecl
) = 0;
1577 if (DECL_THIS_STATIC (newdecl
) && !DECL_THIS_STATIC (olddecl
))
1579 /* If a builtin function is redeclared as `static', merge
1580 the declarations, but make the original one static. */
1581 DECL_THIS_STATIC (olddecl
) = 1;
1582 TREE_PUBLIC (olddecl
) = 0;
1584 /* Make the old declaration consistent with the new one so
1585 that all remnants of the builtin-ness of this function
1586 will be banished. */
1587 SET_DECL_LANGUAGE (olddecl
, DECL_LANGUAGE (newdecl
));
1588 COPY_DECL_RTL (newdecl
, olddecl
);
1591 else if (TREE_CODE (olddecl
) != TREE_CODE (newdecl
))
1593 /* C++ Standard, 3.3, clause 4:
1594 "[Note: a namespace name or a class template name must be unique
1595 in its declarative region (7.3.2, clause 14). ]" */
1596 if (TREE_CODE (olddecl
) == NAMESPACE_DECL
1597 || TREE_CODE (newdecl
) == NAMESPACE_DECL
)
1598 /* Namespace conflicts with not namespace. */;
1599 else if (DECL_TYPE_TEMPLATE_P (olddecl
)
1600 || DECL_TYPE_TEMPLATE_P (newdecl
))
1601 /* Class template conflicts. */;
1602 else if ((TREE_CODE (newdecl
) == FUNCTION_DECL
1603 && DECL_FUNCTION_TEMPLATE_P (olddecl
))
1604 || (TREE_CODE (olddecl
) == FUNCTION_DECL
1605 && DECL_FUNCTION_TEMPLATE_P (newdecl
)))
1607 /* One is a function and the other is a template
1609 if (!UDLIT_OPER_P (DECL_NAME (newdecl
)))
1612 /* There can only be one! */
1613 if (TREE_CODE (newdecl
) == TEMPLATE_DECL
1614 && check_raw_literal_operator (olddecl
))
1615 error_at (newdecl_loc
,
1616 "literal operator %q#D conflicts with"
1617 " raw literal operator", newdecl
);
1618 else if (check_raw_literal_operator (newdecl
))
1619 error_at (newdecl_loc
,
1620 "raw literal operator %q#D conflicts with"
1621 " literal operator template", newdecl
);
1625 inform (olddecl_loc
, "previous declaration %q#D", olddecl
);
1626 return error_mark_node
;
1628 else if (DECL_IMPLICIT_TYPEDEF_P (olddecl
)
1629 || DECL_IMPLICIT_TYPEDEF_P (newdecl
))
1630 /* One is an implicit typedef, that's ok. */
1633 error ("%q#D redeclared as different kind of entity", newdecl
);
1634 inform (olddecl_loc
, "previous declaration %q#D", olddecl
);
1636 return error_mark_node
;
1638 else if (!types_match
)
1640 if (CP_DECL_CONTEXT (newdecl
) != CP_DECL_CONTEXT (olddecl
))
1641 /* These are certainly not duplicate declarations; they're
1642 from different scopes. */
1645 if (TREE_CODE (newdecl
) == TEMPLATE_DECL
)
1647 /* The name of a class template may not be declared to refer to
1648 any other template, class, function, object, namespace, value,
1649 or type in the same scope. */
1650 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl
)) == TYPE_DECL
1651 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) == TYPE_DECL
)
1653 error_at (newdecl_loc
,
1654 "conflicting declaration of template %q#D", newdecl
);
1655 inform (olddecl_loc
,
1656 "previous declaration %q#D", olddecl
);
1657 return error_mark_node
;
1659 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl
)) == FUNCTION_DECL
1660 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) == FUNCTION_DECL
1661 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl
))),
1662 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl
))))
1663 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl
),
1664 DECL_TEMPLATE_PARMS (olddecl
))
1665 /* Template functions can be disambiguated by
1667 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl
)),
1668 TREE_TYPE (TREE_TYPE (olddecl
)))
1669 /* Template functions can also be disambiguated by
1671 && equivalently_constrained (olddecl
, newdecl
))
1673 error_at (newdecl_loc
, "ambiguating new declaration %q#D",
1675 inform (olddecl_loc
,
1676 "old declaration %q#D", olddecl
);
1678 else if (check_concept_refinement (olddecl
, newdecl
))
1679 return error_mark_node
;
1682 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1684 if (DECL_EXTERN_C_P (newdecl
) && DECL_EXTERN_C_P (olddecl
))
1686 error_at (newdecl_loc
,
1687 "conflicting declaration of C function %q#D",
1689 inform (olddecl_loc
,
1690 "previous declaration %q#D", olddecl
);
1693 /* For function versions, params and types match, but they
1694 are not ambiguous. */
1695 else if ((!DECL_FUNCTION_VERSIONED (newdecl
)
1696 && !DECL_FUNCTION_VERSIONED (olddecl
))
1697 // The functions have the same parameter types.
1698 && compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl
)),
1699 TYPE_ARG_TYPES (TREE_TYPE (olddecl
)))
1700 // And the same constraints.
1701 && equivalently_constrained (newdecl
, olddecl
))
1703 error_at (newdecl_loc
,
1704 "ambiguating new declaration of %q#D", newdecl
);
1705 inform (olddecl_loc
,
1706 "old declaration %q#D", olddecl
);
1707 return error_mark_node
;
1714 error_at (newdecl_loc
, "conflicting declaration %q#D", newdecl
);
1715 inform (olddecl_loc
,
1716 "previous declaration as %q#D", olddecl
);
1717 return error_mark_node
;
1720 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
1721 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl
)
1722 && (!DECL_TEMPLATE_INFO (newdecl
)
1723 || (DECL_TI_TEMPLATE (newdecl
)
1724 != DECL_TI_TEMPLATE (olddecl
))))
1725 || (DECL_TEMPLATE_SPECIALIZATION (newdecl
)
1726 && (!DECL_TEMPLATE_INFO (olddecl
)
1727 || (DECL_TI_TEMPLATE (olddecl
)
1728 != DECL_TI_TEMPLATE (newdecl
))))))
1729 /* It's OK to have a template specialization and a non-template
1730 with the same type, or to have specializations of two
1731 different templates with the same type. Note that if one is a
1732 specialization, and the other is an instantiation of the same
1733 template, that we do not exit at this point. That situation
1734 can occur if we instantiate a template class, and then
1735 specialize one of its methods. This situation is valid, but
1736 the declarations must be merged in the usual way. */
1738 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
1739 && ((DECL_TEMPLATE_INSTANTIATION (olddecl
)
1740 && !DECL_USE_TEMPLATE (newdecl
))
1741 || (DECL_TEMPLATE_INSTANTIATION (newdecl
)
1742 && !DECL_USE_TEMPLATE (olddecl
))))
1743 /* One of the declarations is a template instantiation, and the
1744 other is not a template at all. That's OK. */
1746 else if (TREE_CODE (newdecl
) == NAMESPACE_DECL
)
1748 /* In [namespace.alias] we have:
1750 In a declarative region, a namespace-alias-definition can be
1751 used to redefine a namespace-alias declared in that declarative
1752 region to refer only to the namespace to which it already
1755 Therefore, if we encounter a second alias directive for the same
1756 alias, we can just ignore the second directive. */
1757 if (DECL_NAMESPACE_ALIAS (newdecl
)
1758 && (DECL_NAMESPACE_ALIAS (newdecl
)
1759 == DECL_NAMESPACE_ALIAS (olddecl
)))
1762 /* Leave it to update_binding to merge or report error. */
1767 const char *errmsg
= redeclaration_error_message (newdecl
, olddecl
);
1770 auto_diagnostic_group d
;
1771 error_at (newdecl_loc
, errmsg
, newdecl
);
1772 if (DECL_NAME (olddecl
) != NULL_TREE
)
1773 inform (olddecl_loc
,
1774 (DECL_INITIAL (olddecl
) && namespace_bindings_p ())
1775 ? G_("%q#D previously defined here")
1776 : G_("%q#D previously declared here"), olddecl
);
1777 return error_mark_node
;
1779 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1780 && DECL_INITIAL (olddecl
) != NULL_TREE
1781 && !prototype_p (TREE_TYPE (olddecl
))
1782 && prototype_p (TREE_TYPE (newdecl
)))
1784 /* Prototype decl follows defn w/o prototype. */
1785 auto_diagnostic_group d
;
1786 if (warning_at (newdecl_loc
, 0,
1787 "prototype specified for %q#D", newdecl
))
1788 inform (olddecl_loc
,
1789 "previous non-prototype definition here");
1791 else if (VAR_OR_FUNCTION_DECL_P (olddecl
)
1792 && DECL_LANGUAGE (newdecl
) != DECL_LANGUAGE (olddecl
))
1795 If two declarations of the same function or object
1796 specify different linkage-specifications ..., the program
1797 is ill-formed.... Except for functions with C++ linkage,
1798 a function declaration without a linkage specification
1799 shall not precede the first linkage specification for
1800 that function. A function can be declared without a
1801 linkage specification after an explicit linkage
1802 specification has been seen; the linkage explicitly
1803 specified in the earlier declaration is not affected by
1804 such a function declaration.
1806 DR 563 raises the question why the restrictions on
1807 functions should not also apply to objects. Older
1808 versions of G++ silently ignore the linkage-specification
1816 which is clearly wrong. Therefore, we now treat objects
1818 if (current_lang_depth () == 0)
1820 /* There is no explicit linkage-specification, so we use
1821 the linkage from the previous declaration. */
1822 retrofit_lang_decl (newdecl
);
1823 SET_DECL_LANGUAGE (newdecl
, DECL_LANGUAGE (olddecl
));
1827 auto_diagnostic_group d
;
1828 error_at (newdecl_loc
,
1829 "conflicting declaration of %q#D with %qL linkage",
1830 newdecl
, DECL_LANGUAGE (newdecl
));
1831 inform (olddecl_loc
,
1832 "previous declaration with %qL linkage",
1833 DECL_LANGUAGE (olddecl
));
1837 if (DECL_LANG_SPECIFIC (olddecl
) && DECL_USE_TEMPLATE (olddecl
))
1839 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
1841 /* Note: free functions, as TEMPLATE_DECLs, are handled below. */
1842 if (DECL_FUNCTION_MEMBER_P (olddecl
)
1843 && (/* grokfndecl passes member function templates too
1844 as FUNCTION_DECLs. */
1845 DECL_TEMPLATE_INFO (olddecl
)
1847 Default arguments for a member function of a class
1848 template shall be specified on the initial declaration
1849 of the member function within the class template. */
1850 || CLASSTYPE_TEMPLATE_INFO (CP_DECL_CONTEXT (olddecl
))))
1851 check_redeclaration_no_default_args (newdecl
);
1854 tree t1
= FUNCTION_FIRST_USER_PARMTYPE (olddecl
);
1855 tree t2
= FUNCTION_FIRST_USER_PARMTYPE (newdecl
);
1858 for (; t1
&& t1
!= void_list_node
;
1859 t1
= TREE_CHAIN (t1
), t2
= TREE_CHAIN (t2
), i
++)
1860 if (TREE_PURPOSE (t1
) && TREE_PURPOSE (t2
))
1862 if (simple_cst_equal (TREE_PURPOSE (t1
),
1863 TREE_PURPOSE (t2
)) == 1)
1865 auto_diagnostic_group d
;
1866 if (permerror (newdecl_loc
,
1867 "default argument given for parameter "
1868 "%d of %q#D", i
, newdecl
))
1869 inform (olddecl_loc
,
1870 "previous specification in %q#D here",
1875 auto_diagnostic_group d
;
1876 error_at (newdecl_loc
,
1877 "default argument given for parameter %d "
1878 "of %q#D", i
, newdecl
);
1879 inform (olddecl_loc
,
1880 "previous specification in %q#D here",
1885 /* C++17 11.3.6/4: "If a friend declaration specifies a default
1886 argument expression, that declaration... shall be the only
1887 declaration of the function or function template in the
1888 translation unit." */
1889 check_no_redeclaration_friend_default_args
1890 (olddecl
, newdecl
, DECL_HIDDEN_FRIEND_P (olddecl
));
1895 /* Do not merge an implicit typedef with an explicit one. In:
1899 typedef class A A __attribute__ ((foo));
1901 the attribute should apply only to the typedef. */
1902 if (TREE_CODE (olddecl
) == TYPE_DECL
1903 && (DECL_IMPLICIT_TYPEDEF_P (olddecl
)
1904 || DECL_IMPLICIT_TYPEDEF_P (newdecl
)))
1907 if (!validate_constexpr_redeclaration (olddecl
, newdecl
))
1908 return error_mark_node
;
1910 /* We have committed to returning OLDDECL at this point. */
1912 /* If new decl is `static' and an `extern' was seen previously,
1914 warn_extern_redeclared_static (newdecl
, olddecl
);
1916 /* True to merge attributes between the declarations, false to
1917 set OLDDECL's attributes to those of NEWDECL (for template
1918 explicit specializations that specify their own attributes
1919 independent of those specified for the primary template). */
1920 const bool merge_attr
= (TREE_CODE (newdecl
) != FUNCTION_DECL
1921 || !DECL_TEMPLATE_SPECIALIZATION (newdecl
)
1922 || DECL_TEMPLATE_SPECIALIZATION (olddecl
));
1924 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1926 if (merge_attr
&& diagnose_mismatched_attributes (olddecl
, newdecl
))
1927 inform (olddecl_loc
, DECL_INITIAL (olddecl
)
1928 ? G_("previous definition of %qD here")
1929 : G_("previous declaration of %qD here"), olddecl
);
1931 /* Now that functions must hold information normally held
1932 by field decls, there is extra work to do so that
1933 declaration information does not get destroyed during
1935 if (DECL_VINDEX (olddecl
))
1936 DECL_VINDEX (newdecl
) = DECL_VINDEX (olddecl
);
1937 if (DECL_CONTEXT (olddecl
))
1938 DECL_CONTEXT (newdecl
) = DECL_CONTEXT (olddecl
);
1939 DECL_STATIC_CONSTRUCTOR (newdecl
) |= DECL_STATIC_CONSTRUCTOR (olddecl
);
1940 DECL_STATIC_DESTRUCTOR (newdecl
) |= DECL_STATIC_DESTRUCTOR (olddecl
);
1941 DECL_PURE_VIRTUAL_P (newdecl
) |= DECL_PURE_VIRTUAL_P (olddecl
);
1942 DECL_VIRTUAL_P (newdecl
) |= DECL_VIRTUAL_P (olddecl
);
1943 DECL_INVALID_OVERRIDER_P (newdecl
) |= DECL_INVALID_OVERRIDER_P (olddecl
);
1944 DECL_FINAL_P (newdecl
) |= DECL_FINAL_P (olddecl
);
1945 DECL_OVERRIDE_P (newdecl
) |= DECL_OVERRIDE_P (olddecl
);
1946 DECL_THIS_STATIC (newdecl
) |= DECL_THIS_STATIC (olddecl
);
1947 if (DECL_OVERLOADED_OPERATOR_P (olddecl
))
1948 DECL_OVERLOADED_OPERATOR_CODE_RAW (newdecl
)
1949 = DECL_OVERLOADED_OPERATOR_CODE_RAW (olddecl
);
1950 new_defines_function
= DECL_INITIAL (newdecl
) != NULL_TREE
;
1952 /* Optionally warn about more than one declaration for the same
1953 name, but don't warn about a function declaration followed by a
1955 if (warn_redundant_decls
&& ! DECL_ARTIFICIAL (olddecl
)
1956 && !(new_defines_function
&& DECL_INITIAL (olddecl
) == NULL_TREE
)
1957 /* Don't warn about extern decl followed by definition. */
1958 && !(DECL_EXTERNAL (olddecl
) && ! DECL_EXTERNAL (newdecl
))
1959 /* Don't warn about friends, let add_friend take care of it. */
1960 && ! (newdecl_is_friend
|| DECL_FRIEND_P (olddecl
))
1961 /* Don't warn about declaration followed by specialization. */
1962 && (! DECL_TEMPLATE_SPECIALIZATION (newdecl
)
1963 || DECL_TEMPLATE_SPECIALIZATION (olddecl
)))
1965 auto_diagnostic_group d
;
1966 if (warning_at (newdecl_loc
,
1967 OPT_Wredundant_decls
,
1968 "redundant redeclaration of %qD in same scope",
1970 inform (olddecl_loc
,
1971 "previous declaration of %qD", olddecl
);
1974 if (!(DECL_TEMPLATE_INSTANTIATION (olddecl
)
1975 && DECL_TEMPLATE_SPECIALIZATION (newdecl
)))
1977 if (DECL_DELETED_FN (newdecl
))
1979 auto_diagnostic_group d
;
1980 error_at (newdecl_loc
, "deleted definition of %qD", newdecl
);
1981 inform (olddecl_loc
,
1982 "previous declaration of %qD", olddecl
);
1984 DECL_DELETED_FN (newdecl
) |= DECL_DELETED_FN (olddecl
);
1988 /* Deal with C++: must preserve virtual function table size. */
1989 if (TREE_CODE (olddecl
) == TYPE_DECL
)
1991 tree newtype
= TREE_TYPE (newdecl
);
1992 tree oldtype
= TREE_TYPE (olddecl
);
1994 if (newtype
!= error_mark_node
&& oldtype
!= error_mark_node
1995 && TYPE_LANG_SPECIFIC (newtype
) && TYPE_LANG_SPECIFIC (oldtype
))
1996 CLASSTYPE_FRIEND_CLASSES (newtype
)
1997 = CLASSTYPE_FRIEND_CLASSES (oldtype
);
1999 DECL_ORIGINAL_TYPE (newdecl
) = DECL_ORIGINAL_TYPE (olddecl
);
2002 /* Copy all the DECL_... slots specified in the new decl except for
2003 any that we copy here from the old type. */
2005 DECL_ATTRIBUTES (newdecl
)
2006 = (*targetm
.merge_decl_attributes
) (olddecl
, newdecl
);
2008 DECL_ATTRIBUTES (olddecl
) = DECL_ATTRIBUTES (newdecl
);
2010 if (DECL_DECLARES_FUNCTION_P (olddecl
))
2012 olddecl_friend
= DECL_FRIEND_P (olddecl
);
2013 olddecl_hidden_friend
= DECL_HIDDEN_FRIEND_P (olddecl
);
2014 hidden_friend
= (DECL_ANTICIPATED (olddecl
)
2015 && DECL_HIDDEN_FRIEND_P (olddecl
)
2016 && newdecl_is_friend
);
2019 DECL_ANTICIPATED (olddecl
) = 0;
2020 DECL_HIDDEN_FRIEND_P (olddecl
) = 0;
2024 if (TREE_CODE (newdecl
) == TEMPLATE_DECL
)
2026 tree old_result
= DECL_TEMPLATE_RESULT (olddecl
);
2027 tree new_result
= DECL_TEMPLATE_RESULT (newdecl
);
2028 TREE_TYPE (olddecl
) = TREE_TYPE (old_result
);
2029 DECL_TEMPLATE_SPECIALIZATIONS (olddecl
)
2030 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl
),
2031 DECL_TEMPLATE_SPECIALIZATIONS (newdecl
));
2033 DECL_ATTRIBUTES (old_result
)
2034 = (*targetm
.merge_decl_attributes
) (old_result
, new_result
);
2036 if (DECL_FUNCTION_TEMPLATE_P (newdecl
))
2038 if (DECL_SOURCE_LOCATION (newdecl
)
2039 != DECL_SOURCE_LOCATION (olddecl
))
2041 /* Per C++11 8.3.6/4, default arguments cannot be added in
2042 later declarations of a function template. */
2043 check_redeclaration_no_default_args (newdecl
);
2044 /* C++17 11.3.6/4: "If a friend declaration specifies a default
2045 argument expression, that declaration... shall be the only
2046 declaration of the function or function template in the
2047 translation unit." */
2048 check_no_redeclaration_friend_default_args
2049 (old_result
, new_result
, olddecl_hidden_friend
);
2052 check_default_args (newdecl
);
2054 if (GNU_INLINE_P (old_result
) != GNU_INLINE_P (new_result
)
2055 && DECL_INITIAL (new_result
))
2057 if (DECL_INITIAL (old_result
))
2058 DECL_UNINLINABLE (old_result
) = 1;
2060 DECL_UNINLINABLE (old_result
) = DECL_UNINLINABLE (new_result
);
2061 DECL_EXTERNAL (old_result
) = DECL_EXTERNAL (new_result
);
2062 DECL_NOT_REALLY_EXTERN (old_result
)
2063 = DECL_NOT_REALLY_EXTERN (new_result
);
2064 DECL_INTERFACE_KNOWN (old_result
)
2065 = DECL_INTERFACE_KNOWN (new_result
);
2066 DECL_DECLARED_INLINE_P (old_result
)
2067 = DECL_DECLARED_INLINE_P (new_result
);
2068 DECL_DISREGARD_INLINE_LIMITS (old_result
)
2069 |= DECL_DISREGARD_INLINE_LIMITS (new_result
);
2074 DECL_DECLARED_INLINE_P (old_result
)
2075 |= DECL_DECLARED_INLINE_P (new_result
);
2076 DECL_DISREGARD_INLINE_LIMITS (old_result
)
2077 |= DECL_DISREGARD_INLINE_LIMITS (new_result
);
2078 check_redeclaration_exception_specification (newdecl
, olddecl
);
2080 merge_attribute_bits (new_result
, old_result
);
2084 /* If the new declaration is a definition, update the file and
2085 line information on the declaration, and also make
2086 the old declaration the same definition. */
2087 if (DECL_INITIAL (new_result
) != NULL_TREE
)
2089 DECL_SOURCE_LOCATION (olddecl
)
2090 = DECL_SOURCE_LOCATION (old_result
)
2091 = DECL_SOURCE_LOCATION (newdecl
);
2092 DECL_INITIAL (old_result
) = DECL_INITIAL (new_result
);
2093 if (DECL_FUNCTION_TEMPLATE_P (newdecl
))
2096 DECL_ARGUMENTS (old_result
)
2097 = DECL_ARGUMENTS (new_result
);
2098 for (parm
= DECL_ARGUMENTS (old_result
); parm
;
2099 parm
= DECL_CHAIN (parm
))
2100 DECL_CONTEXT (parm
) = old_result
;
2109 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2110 check_redeclaration_exception_specification (newdecl
, olddecl
);
2112 /* Automatically handles default parameters. */
2113 tree oldtype
= TREE_TYPE (olddecl
);
2116 /* For typedefs use the old type, as the new type's DECL_NAME points
2117 at newdecl, which will be ggc_freed. */
2118 if (TREE_CODE (newdecl
) == TYPE_DECL
)
2120 /* But NEWTYPE might have an attribute, honor that. */
2121 tree tem
= TREE_TYPE (newdecl
);
2124 if (TYPE_USER_ALIGN (tem
))
2126 if (TYPE_ALIGN (tem
) > TYPE_ALIGN (newtype
))
2127 SET_TYPE_ALIGN (newtype
, TYPE_ALIGN (tem
));
2128 TYPE_USER_ALIGN (newtype
) = true;
2131 /* And remove the new type from the variants list. */
2132 if (TYPE_NAME (TREE_TYPE (newdecl
)) == newdecl
)
2134 tree remove
= TREE_TYPE (newdecl
);
2135 for (tree t
= TYPE_MAIN_VARIANT (remove
); ;
2136 t
= TYPE_NEXT_VARIANT (t
))
2137 if (TYPE_NEXT_VARIANT (t
) == remove
)
2139 TYPE_NEXT_VARIANT (t
) = TYPE_NEXT_VARIANT (remove
);
2144 else if (merge_attr
)
2145 newtype
= merge_types (TREE_TYPE (newdecl
), TREE_TYPE (olddecl
));
2147 newtype
= TREE_TYPE (newdecl
);
2149 if (VAR_P (newdecl
))
2151 DECL_THIS_EXTERN (newdecl
) |= DECL_THIS_EXTERN (olddecl
);
2152 /* For already initialized vars, TREE_READONLY could have been
2153 cleared in cp_finish_decl, because the var needs runtime
2154 initialization or destruction. Make sure not to set
2155 TREE_READONLY on it again. */
2156 if (DECL_INITIALIZED_P (olddecl
)
2157 && !DECL_EXTERNAL (olddecl
)
2158 && !TREE_READONLY (olddecl
))
2159 TREE_READONLY (newdecl
) = 0;
2160 DECL_INITIALIZED_P (newdecl
) |= DECL_INITIALIZED_P (olddecl
);
2161 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl
)
2162 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl
);
2163 if (DECL_DEPENDENT_INIT_P (olddecl
))
2164 SET_DECL_DEPENDENT_INIT_P (newdecl
, true);
2165 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl
)
2166 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl
);
2167 if (DECL_CLASS_SCOPE_P (olddecl
))
2168 DECL_DECLARED_CONSTEXPR_P (newdecl
)
2169 |= DECL_DECLARED_CONSTEXPR_P (olddecl
);
2171 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
2172 if (DECL_LANG_SPECIFIC (olddecl
)
2173 && CP_DECL_THREADPRIVATE_P (olddecl
))
2175 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
2176 retrofit_lang_decl (newdecl
);
2177 CP_DECL_THREADPRIVATE_P (newdecl
) = 1;
2181 /* An explicit specialization of a function template or of a member
2182 function of a class template can be declared transaction_safe
2183 independently of whether the corresponding template entity is declared
2184 transaction_safe. */
2185 if (flag_tm
&& TREE_CODE (newdecl
) == FUNCTION_DECL
2186 && DECL_TEMPLATE_INSTANTIATION (olddecl
)
2187 && DECL_TEMPLATE_SPECIALIZATION (newdecl
)
2188 && tx_safe_fn_type_p (newtype
)
2189 && !tx_safe_fn_type_p (TREE_TYPE (newdecl
)))
2190 newtype
= tx_unsafe_fn_variant (newtype
);
2192 TREE_TYPE (newdecl
) = TREE_TYPE (olddecl
) = newtype
;
2194 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2195 check_default_args (newdecl
);
2197 /* Lay the type out, unless already done. */
2198 if (! same_type_p (newtype
, oldtype
)
2199 && TREE_TYPE (newdecl
) != error_mark_node
2200 && !(processing_template_decl
&& uses_template_parms (newdecl
)))
2201 layout_type (TREE_TYPE (newdecl
));
2203 if ((VAR_P (newdecl
)
2204 || TREE_CODE (newdecl
) == PARM_DECL
2205 || TREE_CODE (newdecl
) == RESULT_DECL
2206 || TREE_CODE (newdecl
) == FIELD_DECL
2207 || TREE_CODE (newdecl
) == TYPE_DECL
)
2208 && !(processing_template_decl
&& uses_template_parms (newdecl
)))
2209 layout_decl (newdecl
, 0);
2211 /* Merge deprecatedness. */
2212 if (TREE_DEPRECATED (newdecl
))
2213 TREE_DEPRECATED (olddecl
) = 1;
2215 /* Preserve function specific target and optimization options */
2216 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2218 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl
)
2219 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl
))
2220 DECL_FUNCTION_SPECIFIC_TARGET (newdecl
)
2221 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl
);
2223 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
)
2224 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
))
2225 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
)
2226 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
);
2230 /* Merge the const type qualifier. */
2231 if (TREE_READONLY (newdecl
))
2232 TREE_READONLY (olddecl
) = 1;
2233 /* Merge the volatile type qualifier. */
2234 if (TREE_THIS_VOLATILE (newdecl
))
2235 TREE_THIS_VOLATILE (olddecl
) = 1;
2238 /* Merge the initialization information. */
2239 if (DECL_INITIAL (newdecl
) == NULL_TREE
2240 && DECL_INITIAL (olddecl
) != NULL_TREE
)
2242 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
2243 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
2244 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2246 DECL_SAVED_TREE (newdecl
) = DECL_SAVED_TREE (olddecl
);
2247 DECL_STRUCT_FUNCTION (newdecl
) = DECL_STRUCT_FUNCTION (olddecl
);
2251 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2253 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl
)
2254 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl
);
2255 DECL_NO_LIMIT_STACK (newdecl
) |= DECL_NO_LIMIT_STACK (olddecl
);
2256 DECL_IS_OPERATOR_NEW (newdecl
) |= DECL_IS_OPERATOR_NEW (olddecl
);
2257 DECL_LOOPING_CONST_OR_PURE_P (newdecl
)
2258 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl
);
2261 merge_attribute_bits (newdecl
, olddecl
);
2264 /* Merge the noreturn bit. */
2265 TREE_THIS_VOLATILE (olddecl
) = TREE_THIS_VOLATILE (newdecl
);
2266 TREE_READONLY (olddecl
) = TREE_READONLY (newdecl
);
2267 TREE_NOTHROW (olddecl
) = TREE_NOTHROW (newdecl
);
2268 DECL_IS_MALLOC (olddecl
) = DECL_IS_MALLOC (newdecl
);
2269 DECL_PURE_P (olddecl
) = DECL_PURE_P (newdecl
);
2271 /* Keep the old RTL. */
2272 COPY_DECL_RTL (olddecl
, newdecl
);
2274 else if (VAR_P (newdecl
)
2275 && (DECL_SIZE (olddecl
) || !DECL_SIZE (newdecl
)))
2277 /* Keep the old RTL. We cannot keep the old RTL if the old
2278 declaration was for an incomplete object and the new
2279 declaration is not since many attributes of the RTL will
2281 COPY_DECL_RTL (olddecl
, newdecl
);
2284 /* If cannot merge, then use the new type and qualifiers,
2285 and don't preserve the old rtl. */
2288 /* Clean out any memory we had of the old declaration. */
2289 tree oldstatic
= value_member (olddecl
, static_aggregates
);
2291 TREE_VALUE (oldstatic
) = error_mark_node
;
2293 TREE_TYPE (olddecl
) = TREE_TYPE (newdecl
);
2294 TREE_READONLY (olddecl
) = TREE_READONLY (newdecl
);
2295 TREE_THIS_VOLATILE (olddecl
) = TREE_THIS_VOLATILE (newdecl
);
2296 TREE_NOTHROW (olddecl
) = TREE_NOTHROW (newdecl
);
2297 TREE_SIDE_EFFECTS (olddecl
) = TREE_SIDE_EFFECTS (newdecl
);
2300 /* Merge the storage class information. */
2301 merge_weak (newdecl
, olddecl
);
2303 DECL_DEFER_OUTPUT (newdecl
) |= DECL_DEFER_OUTPUT (olddecl
);
2304 TREE_PUBLIC (newdecl
) = TREE_PUBLIC (olddecl
);
2305 TREE_STATIC (olddecl
) = TREE_STATIC (newdecl
) |= TREE_STATIC (olddecl
);
2306 if (! DECL_EXTERNAL (olddecl
))
2307 DECL_EXTERNAL (newdecl
) = 0;
2308 if (! DECL_COMDAT (olddecl
))
2309 DECL_COMDAT (newdecl
) = 0;
2311 new_template_info
= NULL_TREE
;
2312 if (DECL_LANG_SPECIFIC (newdecl
) && DECL_LANG_SPECIFIC (olddecl
))
2314 bool new_redefines_gnu_inline
= false;
2316 if (new_defines_function
2317 && ((DECL_INTERFACE_KNOWN (olddecl
)
2318 && TREE_CODE (olddecl
) == FUNCTION_DECL
)
2319 || (TREE_CODE (olddecl
) == TEMPLATE_DECL
2320 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl
))
2321 == FUNCTION_DECL
))))
2325 if (TREE_CODE (fn
) == TEMPLATE_DECL
)
2326 fn
= DECL_TEMPLATE_RESULT (olddecl
);
2328 new_redefines_gnu_inline
= GNU_INLINE_P (fn
) && DECL_INITIAL (fn
);
2331 if (!new_redefines_gnu_inline
)
2333 DECL_INTERFACE_KNOWN (newdecl
) |= DECL_INTERFACE_KNOWN (olddecl
);
2334 DECL_NOT_REALLY_EXTERN (newdecl
) |= DECL_NOT_REALLY_EXTERN (olddecl
);
2335 DECL_COMDAT (newdecl
) |= DECL_COMDAT (olddecl
);
2337 DECL_TEMPLATE_INSTANTIATED (newdecl
)
2338 |= DECL_TEMPLATE_INSTANTIATED (olddecl
);
2339 DECL_ODR_USED (newdecl
) |= DECL_ODR_USED (olddecl
);
2341 /* If the OLDDECL is an instantiation and/or specialization,
2342 then the NEWDECL must be too. But, it may not yet be marked
2343 as such if the caller has created NEWDECL, but has not yet
2344 figured out that it is a redeclaration. */
2345 if (!DECL_USE_TEMPLATE (newdecl
))
2346 DECL_USE_TEMPLATE (newdecl
) = DECL_USE_TEMPLATE (olddecl
);
2348 /* Don't really know how much of the language-specific
2349 values we should copy from old to new. */
2350 DECL_IN_AGGR_P (newdecl
) = DECL_IN_AGGR_P (olddecl
);
2351 DECL_REPO_AVAILABLE_P (newdecl
) = DECL_REPO_AVAILABLE_P (olddecl
);
2352 DECL_INITIALIZED_IN_CLASS_P (newdecl
)
2353 |= DECL_INITIALIZED_IN_CLASS_P (olddecl
);
2355 if (LANG_DECL_HAS_MIN (newdecl
))
2357 DECL_ACCESS (newdecl
) = DECL_ACCESS (olddecl
);
2358 if (DECL_TEMPLATE_INFO (newdecl
))
2360 new_template_info
= DECL_TEMPLATE_INFO (newdecl
);
2361 if (DECL_TEMPLATE_INSTANTIATION (olddecl
)
2362 && DECL_TEMPLATE_SPECIALIZATION (newdecl
))
2363 /* Remember the presence of explicit specialization args. */
2364 TINFO_USED_TEMPLATE_ID (DECL_TEMPLATE_INFO (olddecl
))
2365 = TINFO_USED_TEMPLATE_ID (new_template_info
);
2367 DECL_TEMPLATE_INFO (newdecl
) = DECL_TEMPLATE_INFO (olddecl
);
2369 /* Only functions have these fields. */
2370 if (DECL_DECLARES_FUNCTION_P (newdecl
))
2372 DECL_NONCONVERTING_P (newdecl
) = DECL_NONCONVERTING_P (olddecl
);
2373 DECL_BEFRIENDING_CLASSES (newdecl
)
2374 = chainon (DECL_BEFRIENDING_CLASSES (newdecl
),
2375 DECL_BEFRIENDING_CLASSES (olddecl
));
2376 /* DECL_THUNKS is only valid for virtual functions,
2377 otherwise it is a DECL_FRIEND_CONTEXT. */
2378 if (DECL_VIRTUAL_P (newdecl
))
2379 SET_DECL_THUNKS (newdecl
, DECL_THUNKS (olddecl
));
2381 /* Only variables have this field. */
2382 else if (VAR_P (newdecl
)
2383 && VAR_HAD_UNKNOWN_BOUND (olddecl
))
2384 SET_VAR_HAD_UNKNOWN_BOUND (newdecl
);
2387 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2391 /* Merge parameter attributes. */
2392 tree oldarg
, newarg
;
2393 for (oldarg
= DECL_ARGUMENTS(olddecl
), newarg
= DECL_ARGUMENTS(newdecl
);
2395 oldarg
= DECL_CHAIN(oldarg
), newarg
= DECL_CHAIN(newarg
))
2397 DECL_ATTRIBUTES (newarg
)
2398 = (*targetm
.merge_decl_attributes
) (oldarg
, newarg
);
2399 DECL_ATTRIBUTES (oldarg
) = DECL_ATTRIBUTES (newarg
);
2402 if (DECL_TEMPLATE_INSTANTIATION (olddecl
)
2403 && !DECL_TEMPLATE_INSTANTIATION (newdecl
))
2405 /* If newdecl is not a specialization, then it is not a
2406 template-related function at all. And that means that we
2407 should have exited above, returning 0. */
2408 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl
));
2410 if (DECL_ODR_USED (olddecl
))
2411 /* From [temp.expl.spec]:
2413 If a template, a member template or the member of a class
2414 template is explicitly specialized then that
2415 specialization shall be declared before the first use of
2416 that specialization that would cause an implicit
2417 instantiation to take place, in every translation unit in
2418 which such a use occurs. */
2419 error ("explicit specialization of %qD after first use",
2422 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl
);
2423 DECL_COMDAT (newdecl
) = (TREE_PUBLIC (newdecl
)
2424 && DECL_DECLARED_INLINE_P (newdecl
));
2426 /* Don't propagate visibility from the template to the
2427 specialization here. We'll do that in determine_visibility if
2429 DECL_VISIBILITY_SPECIFIED (olddecl
) = 0;
2431 /* [temp.expl.spec/14] We don't inline explicit specialization
2432 just because the primary template says so. */
2433 gcc_assert (!merge_attr
);
2435 DECL_DECLARED_INLINE_P (olddecl
)
2436 = DECL_DECLARED_INLINE_P (newdecl
);
2438 DECL_DISREGARD_INLINE_LIMITS (olddecl
)
2439 = DECL_DISREGARD_INLINE_LIMITS (newdecl
);
2441 DECL_UNINLINABLE (olddecl
) = DECL_UNINLINABLE (newdecl
);
2443 else if (new_defines_function
&& DECL_INITIAL (olddecl
))
2445 /* Never inline re-defined extern inline functions.
2446 FIXME: this could be better handled by keeping both
2447 function as separate declarations. */
2448 DECL_UNINLINABLE (newdecl
) = 1;
2452 if (DECL_PENDING_INLINE_P (olddecl
))
2454 DECL_PENDING_INLINE_P (newdecl
) = 1;
2455 DECL_PENDING_INLINE_INFO (newdecl
)
2456 = DECL_PENDING_INLINE_INFO (olddecl
);
2458 else if (DECL_PENDING_INLINE_P (newdecl
))
2460 else if (DECL_SAVED_FUNCTION_DATA (newdecl
) == NULL
)
2461 DECL_SAVED_FUNCTION_DATA (newdecl
)
2462 = DECL_SAVED_FUNCTION_DATA (olddecl
);
2464 DECL_DECLARED_INLINE_P (newdecl
) |= DECL_DECLARED_INLINE_P (olddecl
);
2466 DECL_UNINLINABLE (newdecl
) = DECL_UNINLINABLE (olddecl
)
2467 = (DECL_UNINLINABLE (newdecl
) || DECL_UNINLINABLE (olddecl
));
2469 DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2470 = DECL_DISREGARD_INLINE_LIMITS (olddecl
)
2471 = (DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2472 || DECL_DISREGARD_INLINE_LIMITS (olddecl
));
2475 /* Preserve abstractness on cloned [cd]tors. */
2476 DECL_ABSTRACT_P (newdecl
) = DECL_ABSTRACT_P (olddecl
);
2478 /* Update newdecl's parms to point at olddecl. */
2479 for (parm
= DECL_ARGUMENTS (newdecl
); parm
;
2480 parm
= DECL_CHAIN (parm
))
2481 DECL_CONTEXT (parm
) = olddecl
;
2485 SET_DECL_LANGUAGE (olddecl
, DECL_LANGUAGE (newdecl
));
2486 COPY_DECL_ASSEMBLER_NAME (newdecl
, olddecl
);
2487 COPY_DECL_RTL (newdecl
, olddecl
);
2489 if (! types_match
|| new_defines_function
)
2491 /* These need to be copied so that the names are available.
2492 Note that if the types do match, we'll preserve inline
2493 info and other bits, but if not, we won't. */
2494 DECL_ARGUMENTS (olddecl
) = DECL_ARGUMENTS (newdecl
);
2495 DECL_RESULT (olddecl
) = DECL_RESULT (newdecl
);
2497 /* If redeclaring a builtin function, it stays built in
2498 if newdecl is a gnu_inline definition, or if newdecl is just
2500 if (fndecl_built_in_p (olddecl
)
2501 && (new_defines_function
? GNU_INLINE_P (newdecl
) : types_match
))
2503 DECL_BUILT_IN_CLASS (newdecl
) = DECL_BUILT_IN_CLASS (olddecl
);
2504 DECL_FUNCTION_CODE (newdecl
) = DECL_FUNCTION_CODE (olddecl
);
2505 /* If we're keeping the built-in definition, keep the rtl,
2506 regardless of declaration matches. */
2507 COPY_DECL_RTL (olddecl
, newdecl
);
2508 if (DECL_BUILT_IN_CLASS (newdecl
) == BUILT_IN_NORMAL
)
2510 enum built_in_function fncode
= DECL_FUNCTION_CODE (newdecl
);
2513 /* If a compatible prototype of these builtin functions
2514 is seen, assume the runtime implements it with the
2515 expected semantics. */
2516 case BUILT_IN_STPCPY
:
2517 if (builtin_decl_explicit_p (fncode
))
2518 set_builtin_decl_implicit_p (fncode
, true);
2521 if (builtin_decl_explicit_p (fncode
))
2522 set_builtin_decl_declared_p (fncode
, true);
2527 copy_attributes_to_builtin (newdecl
);
2529 if (new_defines_function
)
2530 /* If defining a function declared with other language
2531 linkage, use the previously declared language linkage. */
2532 SET_DECL_LANGUAGE (newdecl
, DECL_LANGUAGE (olddecl
));
2533 else if (types_match
)
2535 DECL_RESULT (newdecl
) = DECL_RESULT (olddecl
);
2536 /* Don't clear out the arguments if we're just redeclaring a
2538 if (DECL_ARGUMENTS (olddecl
))
2539 DECL_ARGUMENTS (newdecl
) = DECL_ARGUMENTS (olddecl
);
2542 else if (TREE_CODE (newdecl
) == NAMESPACE_DECL
)
2543 NAMESPACE_LEVEL (newdecl
) = NAMESPACE_LEVEL (olddecl
);
2545 /* Now preserve various other info from the definition. */
2546 TREE_ADDRESSABLE (newdecl
) = TREE_ADDRESSABLE (olddecl
);
2547 TREE_ASM_WRITTEN (newdecl
) = TREE_ASM_WRITTEN (olddecl
);
2548 DECL_COMMON (newdecl
) = DECL_COMMON (olddecl
);
2549 COPY_DECL_ASSEMBLER_NAME (olddecl
, newdecl
);
2551 /* Warn about conflicting visibility specifications. */
2552 if (DECL_VISIBILITY_SPECIFIED (olddecl
)
2553 && DECL_VISIBILITY_SPECIFIED (newdecl
)
2554 && DECL_VISIBILITY (newdecl
) != DECL_VISIBILITY (olddecl
))
2556 auto_diagnostic_group d
;
2557 if (warning_at (newdecl_loc
, OPT_Wattributes
,
2558 "%qD: visibility attribute ignored because it "
2559 "conflicts with previous declaration", newdecl
))
2560 inform (olddecl_loc
,
2561 "previous declaration of %qD", olddecl
);
2563 /* Choose the declaration which specified visibility. */
2564 if (DECL_VISIBILITY_SPECIFIED (olddecl
))
2566 DECL_VISIBILITY (newdecl
) = DECL_VISIBILITY (olddecl
);
2567 DECL_VISIBILITY_SPECIFIED (newdecl
) = 1;
2569 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2570 so keep this behavior. */
2571 if (VAR_P (newdecl
) && DECL_HAS_INIT_PRIORITY_P (newdecl
))
2573 SET_DECL_INIT_PRIORITY (olddecl
, DECL_INIT_PRIORITY (newdecl
));
2574 DECL_HAS_INIT_PRIORITY_P (olddecl
) = 1;
2576 /* Likewise for DECL_ALIGN, DECL_USER_ALIGN and DECL_PACKED. */
2577 if (DECL_ALIGN (olddecl
) > DECL_ALIGN (newdecl
))
2579 SET_DECL_ALIGN (newdecl
, DECL_ALIGN (olddecl
));
2580 DECL_USER_ALIGN (newdecl
) |= DECL_USER_ALIGN (olddecl
);
2582 DECL_USER_ALIGN (olddecl
) = DECL_USER_ALIGN (newdecl
);
2583 if (DECL_WARN_IF_NOT_ALIGN (olddecl
)
2584 > DECL_WARN_IF_NOT_ALIGN (newdecl
))
2585 SET_DECL_WARN_IF_NOT_ALIGN (newdecl
,
2586 DECL_WARN_IF_NOT_ALIGN (olddecl
));
2587 if (TREE_CODE (newdecl
) == FIELD_DECL
)
2588 DECL_PACKED (olddecl
) = DECL_PACKED (newdecl
);
2590 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2591 with that from NEWDECL below. */
2592 if (DECL_LANG_SPECIFIC (olddecl
))
2594 gcc_assert (DECL_LANG_SPECIFIC (olddecl
)
2595 != DECL_LANG_SPECIFIC (newdecl
));
2596 ggc_free (DECL_LANG_SPECIFIC (olddecl
));
2599 /* Merge the USED information. */
2600 if (TREE_USED (olddecl
))
2601 TREE_USED (newdecl
) = 1;
2602 else if (TREE_USED (newdecl
))
2603 TREE_USED (olddecl
) = 1;
2604 if (VAR_P (newdecl
))
2606 if (DECL_READ_P (olddecl
))
2607 DECL_READ_P (newdecl
) = 1;
2608 else if (DECL_READ_P (newdecl
))
2609 DECL_READ_P (olddecl
) = 1;
2611 if (DECL_PRESERVE_P (olddecl
))
2612 DECL_PRESERVE_P (newdecl
) = 1;
2613 else if (DECL_PRESERVE_P (newdecl
))
2614 DECL_PRESERVE_P (olddecl
) = 1;
2616 /* Merge the DECL_FUNCTION_VERSIONED information. newdecl will be copied
2617 to olddecl and deleted. */
2618 if (TREE_CODE (newdecl
) == FUNCTION_DECL
2619 && DECL_FUNCTION_VERSIONED (olddecl
))
2621 /* Set the flag for newdecl so that it gets copied to olddecl. */
2622 DECL_FUNCTION_VERSIONED (newdecl
) = 1;
2623 /* newdecl will be purged after copying to olddecl and is no longer
2625 cgraph_node::delete_function_version_by_decl (newdecl
);
2628 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2631 struct symtab_node
*snode
= symtab_node::get (olddecl
);
2633 function_size
= sizeof (struct tree_decl_common
);
2635 memcpy ((char *) olddecl
+ sizeof (struct tree_common
),
2636 (char *) newdecl
+ sizeof (struct tree_common
),
2637 function_size
- sizeof (struct tree_common
));
2639 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2640 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2641 sizeof (struct tree_function_decl
) - sizeof (struct tree_decl_common
));
2643 /* Preserve symtab node mapping. */
2644 olddecl
->decl_with_vis
.symtab_node
= snode
;
2646 if (new_template_info
)
2647 /* If newdecl is a template instantiation, it is possible that
2648 the following sequence of events has occurred:
2650 o A friend function was declared in a class template. The
2651 class template was instantiated.
2653 o The instantiation of the friend declaration was
2654 recorded on the instantiation list, and is newdecl.
2656 o Later, however, instantiate_class_template called pushdecl
2657 on the newdecl to perform name injection. But, pushdecl in
2658 turn called duplicate_decls when it discovered that another
2659 declaration of a global function with the same name already
2662 o Here, in duplicate_decls, we decided to clobber newdecl.
2664 If we're going to do that, we'd better make sure that
2665 olddecl, and not newdecl, is on the list of
2666 instantiations so that if we try to do the instantiation
2667 again we won't get the clobbered declaration. */
2668 reregister_specialization (newdecl
,
2674 size_t size
= tree_code_size (TREE_CODE (newdecl
));
2676 memcpy ((char *) olddecl
+ sizeof (struct tree_common
),
2677 (char *) newdecl
+ sizeof (struct tree_common
),
2678 sizeof (struct tree_decl_common
) - sizeof (struct tree_common
));
2679 switch (TREE_CODE (newdecl
))
2689 struct symtab_node
*snode
= NULL
;
2692 && (TREE_STATIC (olddecl
) || TREE_PUBLIC (olddecl
)
2693 || DECL_EXTERNAL (olddecl
)))
2694 snode
= symtab_node::get (olddecl
);
2695 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2696 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2697 size
- sizeof (struct tree_decl_common
)
2698 + TREE_CODE_LENGTH (TREE_CODE (newdecl
)) * sizeof (char *));
2699 if (VAR_P (newdecl
))
2700 olddecl
->decl_with_vis
.symtab_node
= snode
;
2704 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2705 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2706 sizeof (struct tree_decl_non_common
) - sizeof (struct tree_decl_common
)
2707 + TREE_CODE_LENGTH (TREE_CODE (newdecl
)) * sizeof (char *));
2712 if (VAR_OR_FUNCTION_DECL_P (newdecl
))
2714 if (DECL_EXTERNAL (olddecl
)
2715 || TREE_PUBLIC (olddecl
)
2716 || TREE_STATIC (olddecl
))
2718 /* Merge the section attribute.
2719 We want to issue an error if the sections conflict but that must be
2720 done later in decl_attributes since we are called before attributes
2722 if (DECL_SECTION_NAME (newdecl
) != NULL
)
2723 set_decl_section_name (olddecl
, DECL_SECTION_NAME (newdecl
));
2725 if (DECL_ONE_ONLY (newdecl
))
2727 struct symtab_node
*oldsym
, *newsym
;
2728 if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
2729 oldsym
= cgraph_node::get_create (olddecl
);
2731 oldsym
= varpool_node::get_create (olddecl
);
2732 newsym
= symtab_node::get (newdecl
);
2733 oldsym
->set_comdat_group (newsym
->get_comdat_group ());
2738 && CP_DECL_THREAD_LOCAL_P (newdecl
))
2740 CP_DECL_THREAD_LOCAL_P (olddecl
) = true;
2741 if (!processing_template_decl
)
2742 set_decl_tls_model (olddecl
, DECL_TLS_MODEL (newdecl
));
2746 DECL_UID (olddecl
) = olddecl_uid
;
2748 DECL_FRIEND_P (olddecl
) = 1;
2751 DECL_ANTICIPATED (olddecl
) = 1;
2752 DECL_HIDDEN_FRIEND_P (olddecl
) = 1;
2755 /* NEWDECL contains the merged attribute lists.
2756 Update OLDDECL to be the same. */
2757 DECL_ATTRIBUTES (olddecl
) = DECL_ATTRIBUTES (newdecl
);
2759 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2760 so that encode_section_info has a chance to look at the new decl
2761 flags and attributes. */
2762 if (DECL_RTL_SET_P (olddecl
)
2763 && (TREE_CODE (olddecl
) == FUNCTION_DECL
2765 && TREE_STATIC (olddecl
))))
2766 make_decl_rtl (olddecl
);
2768 /* The NEWDECL will no longer be needed. Because every out-of-class
2769 declaration of a member results in a call to duplicate_decls,
2770 freeing these nodes represents in a significant savings.
2772 Before releasing the node, be sore to remove function from symbol
2773 table that might have been inserted there to record comdat group.
2774 Be sure to however do not free DECL_STRUCT_FUNCTION because this
2775 structure is shared in between newdecl and oldecl. */
2776 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2777 DECL_STRUCT_FUNCTION (newdecl
) = NULL
;
2778 if (VAR_OR_FUNCTION_DECL_P (newdecl
))
2780 struct symtab_node
*snode
= symtab_node::get (newdecl
);
2785 /* Remove the associated constraints for newdecl, if any, before
2786 reclaiming memory. */
2788 remove_constraints (newdecl
);
2795 /* Return zero if the declaration NEWDECL is valid
2796 when the declaration OLDDECL (assumed to be for the same name)
2797 has already been seen.
2798 Otherwise return an error message format string with a %s
2799 where the identifier should go. */
2802 redeclaration_error_message (tree newdecl
, tree olddecl
)
2804 if (TREE_CODE (newdecl
) == TYPE_DECL
)
2806 /* Because C++ can put things into name space for free,
2807 constructs like "typedef struct foo { ... } foo"
2808 would look like an erroneous redeclaration. */
2809 if (same_type_p (TREE_TYPE (newdecl
), TREE_TYPE (olddecl
)))
2812 return G_("redefinition of %q#D");
2814 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2816 /* If this is a pure function, its olddecl will actually be
2817 the original initialization to `0' (which we force to call
2818 abort()). Don't complain about redefinition in this case. */
2819 if (DECL_LANG_SPECIFIC (olddecl
) && DECL_PURE_VIRTUAL_P (olddecl
)
2820 && DECL_INITIAL (olddecl
) == NULL_TREE
)
2823 /* If both functions come from different namespaces, this is not
2824 a redeclaration - this is a conflict with a used function. */
2825 if (DECL_NAMESPACE_SCOPE_P (olddecl
)
2826 && DECL_CONTEXT (olddecl
) != DECL_CONTEXT (newdecl
)
2827 && ! decls_match (olddecl
, newdecl
))
2828 return G_("%qD conflicts with used function");
2830 /* We'll complain about linkage mismatches in
2831 warn_extern_redeclared_static. */
2833 /* Defining the same name twice is no good. */
2834 if (decl_defined_p (olddecl
)
2835 && decl_defined_p (newdecl
))
2837 if (DECL_NAME (olddecl
) == NULL_TREE
)
2838 return G_("%q#D not declared in class");
2839 else if (!GNU_INLINE_P (olddecl
)
2840 || GNU_INLINE_P (newdecl
))
2841 return G_("redefinition of %q#D");
2844 if (DECL_DECLARED_INLINE_P (olddecl
) && DECL_DECLARED_INLINE_P (newdecl
))
2846 bool olda
= GNU_INLINE_P (olddecl
);
2847 bool newa
= GNU_INLINE_P (newdecl
);
2852 return G_("%q+D redeclared inline with "
2853 "%<gnu_inline%> attribute");
2855 return G_("%q+D redeclared inline without "
2856 "%<gnu_inline%> attribute");
2860 check_abi_tag_redeclaration
2861 (olddecl
, lookup_attribute ("abi_tag", DECL_ATTRIBUTES (olddecl
)),
2862 lookup_attribute ("abi_tag", DECL_ATTRIBUTES (newdecl
)));
2866 else if (TREE_CODE (newdecl
) == TEMPLATE_DECL
)
2870 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) == TYPE_DECL
)
2872 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl
))
2873 && COMPLETE_TYPE_P (TREE_TYPE (olddecl
)))
2874 return G_("redefinition of %q#D");
2878 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) != FUNCTION_DECL
2879 || (DECL_TEMPLATE_RESULT (newdecl
)
2880 == DECL_TEMPLATE_RESULT (olddecl
)))
2883 nt
= DECL_TEMPLATE_RESULT (newdecl
);
2884 if (DECL_TEMPLATE_INFO (nt
))
2885 nt
= DECL_TEMPLATE_RESULT (template_for_substitution (nt
));
2886 ot
= DECL_TEMPLATE_RESULT (olddecl
);
2887 if (DECL_TEMPLATE_INFO (ot
))
2888 ot
= DECL_TEMPLATE_RESULT (template_for_substitution (ot
));
2889 if (DECL_INITIAL (nt
) && DECL_INITIAL (ot
)
2890 && (!GNU_INLINE_P (ot
) || GNU_INLINE_P (nt
)))
2891 return G_("redefinition of %q#D");
2893 if (DECL_DECLARED_INLINE_P (ot
) && DECL_DECLARED_INLINE_P (nt
))
2895 bool olda
= GNU_INLINE_P (ot
);
2896 bool newa
= GNU_INLINE_P (nt
);
2901 return G_("%q+D redeclared inline with "
2902 "%<gnu_inline%> attribute");
2904 return G_("%q+D redeclared inline without "
2905 "%<gnu_inline%> attribute");
2909 /* Core issue #226 (C++0x):
2911 If a friend function template declaration specifies a
2912 default template-argument, that declaration shall be a
2913 definition and shall be the only declaration of the
2914 function template in the translation unit. */
2915 if ((cxx_dialect
!= cxx98
)
2916 && TREE_CODE (ot
) == FUNCTION_DECL
&& DECL_FRIEND_P (ot
)
2917 && !check_default_tmpl_args (nt
, DECL_TEMPLATE_PARMS (newdecl
),
2918 /*is_primary=*/true,
2919 /*is_partial=*/false,
2920 /*is_friend_decl=*/2))
2921 return G_("redeclaration of friend %q#D "
2922 "may not have default template arguments");
2926 else if (VAR_P (newdecl
)
2927 && CP_DECL_THREAD_LOCAL_P (newdecl
) != CP_DECL_THREAD_LOCAL_P (olddecl
)
2928 && (! DECL_LANG_SPECIFIC (olddecl
)
2929 || ! CP_DECL_THREADPRIVATE_P (olddecl
)
2930 || CP_DECL_THREAD_LOCAL_P (newdecl
)))
2932 /* Only variables can be thread-local, and all declarations must
2933 agree on this property. */
2934 if (CP_DECL_THREAD_LOCAL_P (newdecl
))
2935 return G_("thread-local declaration of %q#D follows "
2936 "non-thread-local declaration");
2938 return G_("non-thread-local declaration of %q#D follows "
2939 "thread-local declaration");
2941 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl
))
2943 /* The objects have been declared at namespace scope. If either
2944 is a member of an anonymous union, then this is an invalid
2945 redeclaration. For example:
2951 if ((VAR_P (newdecl
) && DECL_ANON_UNION_VAR_P (newdecl
))
2952 || (VAR_P (olddecl
) && DECL_ANON_UNION_VAR_P (olddecl
)))
2953 return G_("redeclaration of %q#D");
2954 /* If at least one declaration is a reference, there is no
2955 conflict. For example:
2961 if (DECL_EXTERNAL (newdecl
) || DECL_EXTERNAL (olddecl
))
2964 /* Static data member declared outside a class definition
2965 if the variable is defined within the class with constexpr
2966 specifier is declaration rather than definition (and
2968 if (cxx_dialect
>= cxx17
2970 && DECL_CLASS_SCOPE_P (olddecl
)
2971 && DECL_DECLARED_CONSTEXPR_P (olddecl
)
2972 && !DECL_INITIAL (newdecl
))
2974 DECL_EXTERNAL (newdecl
) = 1;
2975 /* For now, only warn with explicit -Wdeprecated. */
2976 if (global_options_set
.x_warn_deprecated
)
2978 auto_diagnostic_group d
;
2979 if (warning_at (DECL_SOURCE_LOCATION (newdecl
), OPT_Wdeprecated
,
2980 "redundant redeclaration of %<constexpr%> "
2981 "static data member %qD", newdecl
))
2982 inform (DECL_SOURCE_LOCATION (olddecl
),
2983 "previous declaration of %qD", olddecl
);
2988 /* Reject two definitions. */
2989 return G_("redefinition of %q#D");
2993 /* Objects declared with block scope: */
2994 /* Reject two definitions, and reject a definition
2995 together with an external reference. */
2996 if (!(DECL_EXTERNAL (newdecl
) && DECL_EXTERNAL (olddecl
)))
2997 return G_("redeclaration of %q#D");
3003 /* Hash and equality functions for the named_label table. */
3006 named_label_hash::hash (const value_type entry
)
3008 return IDENTIFIER_HASH_VALUE (entry
->name
);
3012 named_label_hash::equal (const value_type entry
, compare_type name
)
3014 return name
== entry
->name
;
3017 /* Look for a label named ID in the current function. If one cannot
3018 be found, create one. Return the named_label_entry, or NULL on
3021 static named_label_entry
*
3022 lookup_label_1 (tree id
, bool making_local_p
)
3024 /* You can't use labels at global scope. */
3025 if (current_function_decl
== NULL_TREE
)
3027 error ("label %qE referenced outside of any function", id
);
3032 named_labels
= hash_table
<named_label_hash
>::create_ggc (13);
3034 hashval_t hash
= IDENTIFIER_HASH_VALUE (id
);
3035 named_label_entry
**slot
3036 = named_labels
->find_slot_with_hash (id
, hash
, INSERT
);
3037 named_label_entry
*old
= *slot
;
3039 if (old
&& old
->label_decl
)
3041 if (!making_local_p
)
3044 if (old
->binding_level
== current_binding_level
)
3046 error ("local label %qE conflicts with existing label", id
);
3047 inform (DECL_SOURCE_LOCATION (old
->label_decl
), "previous label");
3052 /* We are making a new decl, create or reuse the named_label_entry */
3053 named_label_entry
*ent
= NULL
;
3054 if (old
&& !old
->label_decl
)
3058 ent
= ggc_cleared_alloc
<named_label_entry
> ();
3064 /* Now create the LABEL_DECL. */
3065 tree decl
= build_decl (input_location
, LABEL_DECL
, id
, void_type_node
);
3067 DECL_CONTEXT (decl
) = current_function_decl
;
3068 SET_DECL_MODE (decl
, VOIDmode
);
3071 C_DECLARED_LABEL_FLAG (decl
) = true;
3072 DECL_CHAIN (decl
) = current_binding_level
->names
;
3073 current_binding_level
->names
= decl
;
3076 ent
->label_decl
= decl
;
3081 /* Wrapper for lookup_label_1. */
3084 lookup_label (tree id
)
3086 bool subtime
= timevar_cond_start (TV_NAME_LOOKUP
);
3087 named_label_entry
*ent
= lookup_label_1 (id
, false);
3088 timevar_cond_stop (TV_NAME_LOOKUP
, subtime
);
3089 return ent
? ent
->label_decl
: NULL_TREE
;
3093 declare_local_label (tree id
)
3095 bool subtime
= timevar_cond_start (TV_NAME_LOOKUP
);
3096 named_label_entry
*ent
= lookup_label_1 (id
, true);
3097 timevar_cond_stop (TV_NAME_LOOKUP
, subtime
);
3098 return ent
? ent
->label_decl
: NULL_TREE
;
3101 /* Returns nonzero if it is ill-formed to jump past the declaration of
3102 DECL. Returns 2 if it's also a real problem. */
3105 decl_jump_unsafe (tree decl
)
3107 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
3108 with automatic storage duration is not in scope to a point where it is
3109 in scope is ill-formed unless the variable has scalar type, class type
3110 with a trivial default constructor and a trivial destructor, a
3111 cv-qualified version of one of these types, or an array of one of the
3112 preceding types and is declared without an initializer (8.5). */
3113 tree type
= TREE_TYPE (decl
);
3115 if (!VAR_P (decl
) || TREE_STATIC (decl
)
3116 || type
== error_mark_node
)
3119 if (DECL_NONTRIVIALLY_INITIALIZED_P (decl
)
3120 || variably_modified_type_p (type
, NULL_TREE
))
3123 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
))
3129 /* A subroutine of check_previous_goto_1 and check_goto to identify a branch
3133 identify_goto (tree decl
, location_t loc
, const location_t
*locus
,
3134 diagnostic_t diag_kind
)
3137 = emit_diagnostic (diag_kind
, loc
, 0,
3138 decl
? N_("jump to label %qD")
3139 : N_("jump to case label"), decl
);
3140 if (complained
&& locus
)
3141 inform (*locus
, " from here");
3145 /* Check that a single previously seen jump to a newly defined label
3146 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
3147 the jump context; NAMES are the names in scope in LEVEL at the jump
3148 context; LOCUS is the source position of the jump or 0. Returns
3149 true if all is well. */
3152 check_previous_goto_1 (tree decl
, cp_binding_level
* level
, tree names
,
3153 bool exited_omp
, const location_t
*locus
)
3155 cp_binding_level
*b
;
3156 bool complained
= false;
3158 bool saw_eh
= false, saw_omp
= false, saw_tm
= false, saw_cxif
= false;
3162 complained
= identify_goto (decl
, input_location
, locus
, DK_ERROR
);
3164 inform (input_location
, " exits OpenMP structured block");
3169 for (b
= current_binding_level
; b
; b
= b
->level_chain
)
3171 tree new_decls
, old_decls
= (b
== level
? names
: NULL_TREE
);
3173 for (new_decls
= b
->names
; new_decls
!= old_decls
;
3174 new_decls
= (DECL_P (new_decls
) ? DECL_CHAIN (new_decls
)
3175 : TREE_CHAIN (new_decls
)))
3177 int problem
= decl_jump_unsafe (new_decls
);
3183 complained
= identify_goto (decl
, input_location
, locus
,
3185 ? DK_ERROR
: DK_PERMERROR
);
3191 inform (DECL_SOURCE_LOCATION (new_decls
),
3192 " crosses initialization of %q#D", new_decls
);
3194 inform (DECL_SOURCE_LOCATION (new_decls
),
3195 " enters scope of %q#D, which has "
3196 "non-trivial destructor", new_decls
);
3203 const char *inf
= NULL
;
3204 location_t loc
= input_location
;
3209 inf
= N_("enters try block");
3215 inf
= N_("enters catch block");
3221 inf
= N_("enters OpenMP structured block");
3225 case sk_transaction
:
3227 inf
= N_("enters synchronized or atomic statement");
3232 if (!saw_cxif
&& level_for_constexpr_if (b
->level_chain
))
3234 inf
= N_("enters constexpr if statement");
3235 loc
= EXPR_LOCATION (b
->level_chain
->this_entity
);
3247 complained
= identify_goto (decl
, input_location
, locus
, DK_ERROR
);
3250 inform (loc
, " %s", inf
);
3258 check_previous_goto (tree decl
, struct named_label_use_entry
*use
)
3260 check_previous_goto_1 (decl
, use
->binding_level
,
3261 use
->names_in_scope
, use
->in_omp_scope
,
3262 &use
->o_goto_locus
);
3266 check_switch_goto (cp_binding_level
* level
)
3268 return check_previous_goto_1 (NULL_TREE
, level
, level
->names
, false, NULL
);
3271 /* Check that a new jump to a label DECL is OK. Called by
3272 finish_goto_stmt. */
3275 check_goto (tree decl
)
3277 /* We can't know where a computed goto is jumping.
3278 So we assume that it's OK. */
3279 if (TREE_CODE (decl
) != LABEL_DECL
)
3282 /* We didn't record any information about this label when we created it,
3283 and there's not much point since it's trivial to analyze as a return. */
3284 if (decl
== cdtor_label
)
3287 hashval_t hash
= IDENTIFIER_HASH_VALUE (DECL_NAME (decl
));
3288 named_label_entry
**slot
3289 = named_labels
->find_slot_with_hash (DECL_NAME (decl
), hash
, NO_INSERT
);
3290 named_label_entry
*ent
= *slot
;
3292 /* If the label hasn't been defined yet, defer checking. */
3293 if (! DECL_INITIAL (decl
))
3295 /* Don't bother creating another use if the last goto had the
3296 same data, and will therefore create the same set of errors. */
3298 && ent
->uses
->names_in_scope
== current_binding_level
->names
)
3301 named_label_use_entry
*new_use
3302 = ggc_alloc
<named_label_use_entry
> ();
3303 new_use
->binding_level
= current_binding_level
;
3304 new_use
->names_in_scope
= current_binding_level
->names
;
3305 new_use
->o_goto_locus
= input_location
;
3306 new_use
->in_omp_scope
= false;
3308 new_use
->next
= ent
->uses
;
3309 ent
->uses
= new_use
;
3313 bool saw_catch
= false, complained
= false;
3318 if (ent
->in_try_scope
|| ent
->in_catch_scope
|| ent
->in_transaction_scope
3319 || ent
->in_constexpr_if
3320 || ent
->in_omp_scope
|| !vec_safe_is_empty (ent
->bad_decls
))
3322 diagnostic_t diag_kind
= DK_PERMERROR
;
3323 if (ent
->in_try_scope
|| ent
->in_catch_scope
|| ent
->in_constexpr_if
3324 || ent
->in_transaction_scope
|| ent
->in_omp_scope
)
3325 diag_kind
= DK_ERROR
;
3326 complained
= identify_goto (decl
, DECL_SOURCE_LOCATION (decl
),
3327 &input_location
, diag_kind
);
3328 identified
= 1 + (diag_kind
== DK_ERROR
);
3331 FOR_EACH_VEC_SAFE_ELT (ent
->bad_decls
, ix
, bad
)
3333 int u
= decl_jump_unsafe (bad
);
3335 if (u
> 1 && DECL_ARTIFICIAL (bad
))
3337 /* Can't skip init of __exception_info. */
3338 if (identified
== 1)
3340 complained
= identify_goto (decl
, DECL_SOURCE_LOCATION (decl
),
3341 &input_location
, DK_ERROR
);
3345 inform (DECL_SOURCE_LOCATION (bad
), " enters catch block");
3348 else if (complained
)
3351 inform (DECL_SOURCE_LOCATION (bad
),
3352 " skips initialization of %q#D", bad
);
3354 inform (DECL_SOURCE_LOCATION (bad
),
3355 " enters scope of %q#D which has "
3356 "non-trivial destructor", bad
);
3362 if (ent
->in_try_scope
)
3363 inform (input_location
, " enters try block");
3364 else if (ent
->in_catch_scope
&& !saw_catch
)
3365 inform (input_location
, " enters catch block");
3366 else if (ent
->in_transaction_scope
)
3367 inform (input_location
, " enters synchronized or atomic statement");
3368 else if (ent
->in_constexpr_if
)
3369 inform (input_location
, " enters %<constexpr%> if statement");
3372 if (ent
->in_omp_scope
)
3375 inform (input_location
, " enters OpenMP structured block");
3377 else if (flag_openmp
)
3378 for (cp_binding_level
*b
= current_binding_level
; b
; b
= b
->level_chain
)
3380 if (b
== ent
->binding_level
)
3382 if (b
->kind
== sk_omp
)
3386 complained
= identify_goto (decl
,
3387 DECL_SOURCE_LOCATION (decl
),
3388 &input_location
, DK_ERROR
);
3392 inform (input_location
, " exits OpenMP structured block");
3398 /* Check that a return is ok wrt OpenMP structured blocks.
3399 Called by finish_return_stmt. Returns true if all is well. */
3402 check_omp_return (void)
3404 for (cp_binding_level
*b
= current_binding_level
; b
; b
= b
->level_chain
)
3405 if (b
->kind
== sk_omp
)
3407 error ("invalid exit from OpenMP structured block");
3410 else if (b
->kind
== sk_function_parms
)
3415 /* Define a label, specifying the location in the source file.
3416 Return the LABEL_DECL node for the label. */
3419 define_label_1 (location_t location
, tree name
)
3421 /* After labels, make any new cleanups in the function go into their
3422 own new (temporary) binding contour. */
3423 for (cp_binding_level
*p
= current_binding_level
;
3424 p
->kind
!= sk_function_parms
;
3426 p
->more_cleanups_ok
= 0;
3428 named_label_entry
*ent
= lookup_label_1 (name
, false);
3429 tree decl
= ent
->label_decl
;
3431 if (DECL_INITIAL (decl
) != NULL_TREE
)
3433 error ("duplicate label %qD", decl
);
3434 return error_mark_node
;
3438 /* Mark label as having been defined. */
3439 DECL_INITIAL (decl
) = error_mark_node
;
3440 /* Say where in the source. */
3441 DECL_SOURCE_LOCATION (decl
) = location
;
3443 ent
->binding_level
= current_binding_level
;
3444 ent
->names_in_scope
= current_binding_level
->names
;
3446 for (named_label_use_entry
*use
= ent
->uses
; use
; use
= use
->next
)
3447 check_previous_goto (decl
, use
);
3454 /* Wrapper for define_label_1. */
3457 define_label (location_t location
, tree name
)
3459 bool running
= timevar_cond_start (TV_NAME_LOOKUP
);
3460 tree ret
= define_label_1 (location
, name
);
3461 timevar_cond_stop (TV_NAME_LOOKUP
, running
);
3468 cp_binding_level
*level
;
3469 struct cp_switch
*next
;
3470 /* The SWITCH_STMT being built. */
3472 /* A splay-tree mapping the low element of a case range to the high
3473 element, or NULL_TREE if there is no high element. Used to
3474 determine whether or not a new case label duplicates an old case
3475 label. We need a tree, rather than simply a hash table, because
3476 of the GNU case range extension. */
3478 /* Remember whether there was a case value that is outside the
3479 range of the original type of the controlling expression. */
3480 bool outside_range_p
;
3481 /* Remember whether a default: case label has been seen. */
3483 /* Remember whether a BREAK_STMT has been seen in this SWITCH_STMT. */
3484 bool break_stmt_seen_p
;
3485 /* Set if inside of {FOR,DO,WHILE}_BODY nested inside of a switch,
3486 where BREAK_STMT doesn't belong to the SWITCH_STMT. */
3487 bool in_loop_body_p
;
3490 /* A stack of the currently active switch statements. The innermost
3491 switch statement is on the top of the stack. There is no need to
3492 mark the stack for garbage collection because it is only active
3493 during the processing of the body of a function, and we never
3494 collect at that point. */
3496 static struct cp_switch
*switch_stack
;
3498 /* Called right after a switch-statement condition is parsed.
3499 SWITCH_STMT is the switch statement being parsed. */
3502 push_switch (tree switch_stmt
)
3504 struct cp_switch
*p
= XNEW (struct cp_switch
);
3505 p
->level
= current_binding_level
;
3506 p
->next
= switch_stack
;
3507 p
->switch_stmt
= switch_stmt
;
3508 p
->cases
= splay_tree_new (case_compare
, NULL
, NULL
);
3509 p
->outside_range_p
= false;
3510 p
->has_default_p
= false;
3511 p
->break_stmt_seen_p
= false;
3512 p
->in_loop_body_p
= false;
3519 struct cp_switch
*cs
= switch_stack
;
3520 location_t switch_location
;
3522 /* Emit warnings as needed. */
3523 switch_location
= cp_expr_loc_or_loc (cs
->switch_stmt
, input_location
);
3524 const bool bool_cond_p
3525 = (SWITCH_STMT_TYPE (cs
->switch_stmt
)
3526 && TREE_CODE (SWITCH_STMT_TYPE (cs
->switch_stmt
)) == BOOLEAN_TYPE
);
3527 if (!processing_template_decl
)
3528 c_do_switch_warnings (cs
->cases
, switch_location
,
3529 SWITCH_STMT_TYPE (cs
->switch_stmt
),
3530 SWITCH_STMT_COND (cs
->switch_stmt
),
3531 bool_cond_p
, cs
->outside_range_p
);
3533 /* For the benefit of block_may_fallthru remember if the switch body
3534 case labels cover all possible values and if there are break; stmts. */
3535 if (cs
->has_default_p
3536 || (!processing_template_decl
3537 && c_switch_covers_all_cases_p (cs
->cases
,
3538 SWITCH_STMT_TYPE (cs
->switch_stmt
))))
3539 SWITCH_STMT_ALL_CASES_P (cs
->switch_stmt
) = 1;
3540 if (!cs
->break_stmt_seen_p
)
3541 SWITCH_STMT_NO_BREAK_P (cs
->switch_stmt
) = 1;
3542 gcc_assert (!cs
->in_loop_body_p
);
3543 splay_tree_delete (cs
->cases
);
3544 switch_stack
= switch_stack
->next
;
3548 /* Note that a BREAK_STMT is about to be added. If it is inside of
3549 a SWITCH_STMT and not inside of a loop body inside of it, note
3550 in switch_stack we've seen a BREAK_STMT. */
3553 note_break_stmt (void)
3555 if (switch_stack
&& !switch_stack
->in_loop_body_p
)
3556 switch_stack
->break_stmt_seen_p
= true;
3559 /* Note the start of processing of an iteration statement's body.
3560 The note_break_stmt function will do nothing while processing it.
3561 Return a flag that should be passed to note_iteration_stmt_body_end. */
3564 note_iteration_stmt_body_start (void)
3568 bool ret
= switch_stack
->in_loop_body_p
;
3569 switch_stack
->in_loop_body_p
= true;
3573 /* Note the end of processing of an iteration statement's body. */
3576 note_iteration_stmt_body_end (bool prev
)
3579 switch_stack
->in_loop_body_p
= prev
;
3582 /* Convert a case constant VALUE in a switch to the type TYPE of the switch
3583 condition. Note that if TYPE and VALUE are already integral we don't
3584 really do the conversion because the language-independent
3585 warning/optimization code will work better that way. */
3588 case_conversion (tree type
, tree value
)
3590 if (value
== NULL_TREE
)
3593 value
= mark_rvalue_use (value
);
3595 if (cxx_dialect
>= cxx11
3596 && (SCOPED_ENUM_P (type
)
3597 || !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (value
))))
3599 if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type
))
3600 type
= type_promotes_to (type
);
3601 value
= (perform_implicit_conversion_flags
3602 (type
, value
, tf_warning_or_error
,
3603 LOOKUP_IMPLICIT
| LOOKUP_NO_NON_INTEGRAL
));
3605 return cxx_constant_value (value
);
3608 /* Note that we've seen a definition of a case label, and complain if this
3609 is a bad place for one. */
3612 finish_case_label (location_t loc
, tree low_value
, tree high_value
)
3615 cp_binding_level
*p
;
3618 if (low_value
== NULL_TREE
&& high_value
== NULL_TREE
)
3619 switch_stack
->has_default_p
= true;
3621 if (processing_template_decl
)
3625 /* For templates, just add the case label; we'll do semantic
3626 analysis at instantiation-time. */
3627 label
= build_decl (loc
, LABEL_DECL
, NULL_TREE
, void_type_node
);
3628 return add_stmt (build_case_label (low_value
, high_value
, label
));
3631 /* Find the condition on which this switch statement depends. */
3632 cond
= SWITCH_STMT_COND (switch_stack
->switch_stmt
);
3633 if (cond
&& TREE_CODE (cond
) == TREE_LIST
)
3634 cond
= TREE_VALUE (cond
);
3636 if (!check_switch_goto (switch_stack
->level
))
3637 return error_mark_node
;
3639 type
= SWITCH_STMT_TYPE (switch_stack
->switch_stmt
);
3640 if (type
== error_mark_node
)
3641 return error_mark_node
;
3643 low_value
= case_conversion (type
, low_value
);
3644 high_value
= case_conversion (type
, high_value
);
3646 r
= c_add_case_label (loc
, switch_stack
->cases
, cond
, type
,
3647 low_value
, high_value
,
3648 &switch_stack
->outside_range_p
);
3650 /* After labels, make any new cleanups in the function go into their
3651 own new (temporary) binding contour. */
3652 for (p
= current_binding_level
;
3653 p
->kind
!= sk_function_parms
;
3655 p
->more_cleanups_ok
= 0;
3660 struct typename_info
{
3668 struct typename_hasher
: ggc_ptr_hash
<tree_node
>
3670 typedef typename_info
*compare_type
;
3672 /* Hash a TYPENAME_TYPE. */
3679 hash
= (htab_hash_pointer (TYPE_CONTEXT (t
))
3680 ^ htab_hash_pointer (TYPE_IDENTIFIER (t
)));
3685 /* Compare two TYPENAME_TYPEs. */
3688 equal (tree t1
, const typename_info
*t2
)
3690 return (TYPE_IDENTIFIER (t1
) == t2
->name
3691 && TYPE_CONTEXT (t1
) == t2
->scope
3692 && TYPENAME_TYPE_FULLNAME (t1
) == t2
->template_id
3693 && TYPENAME_IS_ENUM_P (t1
) == t2
->enum_p
3694 && TYPENAME_IS_CLASS_P (t1
) == t2
->class_p
);
3698 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
3699 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
3701 Returns the new TYPENAME_TYPE. */
3703 static GTY (()) hash_table
<typename_hasher
> *typename_htab
;
3706 build_typename_type (tree context
, tree name
, tree fullname
,
3707 enum tag_types tag_type
)
3715 if (typename_htab
== NULL
)
3716 typename_htab
= hash_table
<typename_hasher
>::create_ggc (61);
3718 ti
.scope
= FROB_CONTEXT (context
);
3720 ti
.template_id
= fullname
;
3721 ti
.enum_p
= tag_type
== enum_type
;
3722 ti
.class_p
= (tag_type
== class_type
3723 || tag_type
== record_type
3724 || tag_type
== union_type
);
3725 hash
= (htab_hash_pointer (ti
.scope
)
3726 ^ htab_hash_pointer (ti
.name
));
3728 /* See if we already have this type. */
3729 e
= typename_htab
->find_slot_with_hash (&ti
, hash
, INSERT
);
3734 /* Build the TYPENAME_TYPE. */
3735 t
= cxx_make_type (TYPENAME_TYPE
);
3736 TYPE_CONTEXT (t
) = ti
.scope
;
3737 TYPENAME_TYPE_FULLNAME (t
) = ti
.template_id
;
3738 TYPENAME_IS_ENUM_P (t
) = ti
.enum_p
;
3739 TYPENAME_IS_CLASS_P (t
) = ti
.class_p
;
3741 /* Build the corresponding TYPE_DECL. */
3742 d
= build_decl (input_location
, TYPE_DECL
, name
, t
);
3743 TYPE_NAME (TREE_TYPE (d
)) = d
;
3744 TYPE_STUB_DECL (TREE_TYPE (d
)) = d
;
3745 DECL_CONTEXT (d
) = FROB_CONTEXT (context
);
3746 DECL_ARTIFICIAL (d
) = 1;
3748 /* Store it in the hash table. */
3751 /* TYPENAME_TYPEs must always be compared structurally, because
3752 they may or may not resolve down to another type depending on
3753 the currently open classes. */
3754 SET_TYPE_STRUCTURAL_EQUALITY (t
);
3760 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
3761 provided to name the type. Returns an appropriate type, unless an
3762 error occurs, in which case error_mark_node is returned. If we
3763 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
3764 return that, rather than the _TYPE it corresponds to, in other
3765 cases we look through the type decl. If TF_ERROR is set, complain
3766 about errors, otherwise be quiet. */
3769 make_typename_type (tree context
, tree name
, enum tag_types tag_type
,
3770 tsubst_flags_t complain
)
3776 if (name
== error_mark_node
3777 || context
== NULL_TREE
3778 || context
== error_mark_node
)
3779 return error_mark_node
;
3783 if (!(TYPE_LANG_SPECIFIC (name
)
3784 && (CLASSTYPE_IS_TEMPLATE (name
)
3785 || CLASSTYPE_USE_TEMPLATE (name
))))
3786 name
= TYPE_IDENTIFIER (name
);
3788 /* Create a TEMPLATE_ID_EXPR for the type. */
3789 name
= build_nt (TEMPLATE_ID_EXPR
,
3790 CLASSTYPE_TI_TEMPLATE (name
),
3791 CLASSTYPE_TI_ARGS (name
));
3793 else if (TREE_CODE (name
) == TYPE_DECL
)
3794 name
= DECL_NAME (name
);
3798 if (TREE_CODE (name
) == TEMPLATE_ID_EXPR
)
3800 name
= TREE_OPERAND (name
, 0);
3801 if (DECL_TYPE_TEMPLATE_P (name
))
3802 name
= TREE_OPERAND (fullname
, 0) = DECL_NAME (name
);
3803 if (TREE_CODE (name
) != IDENTIFIER_NODE
)
3805 if (complain
& tf_error
)
3806 error ("%qD is not a type", name
);
3807 return error_mark_node
;
3810 if (TREE_CODE (name
) == TEMPLATE_DECL
)
3812 if (complain
& tf_error
)
3813 error ("%qD used without template arguments", name
);
3814 return error_mark_node
;
3816 gcc_assert (identifier_p (name
));
3817 gcc_assert (TYPE_P (context
));
3819 if (!MAYBE_CLASS_TYPE_P (context
))
3821 if (complain
& tf_error
)
3822 error ("%q#T is not a class", context
);
3823 return error_mark_node
;
3826 /* When the CONTEXT is a dependent type, NAME could refer to a
3827 dependent base class of CONTEXT. But look inside it anyway
3828 if CONTEXT is a currently open scope, in case it refers to a
3829 member of the current instantiation or a non-dependent base;
3830 lookup will stop when we hit a dependent base. */
3831 if (!dependent_scope_p (context
))
3832 /* We should only set WANT_TYPE when we're a nested typename type.
3833 Then we can give better diagnostics if we find a non-type. */
3834 t
= lookup_field (context
, name
, 2, /*want_type=*/true);
3838 if ((!t
|| TREE_CODE (t
) == TREE_LIST
) && dependent_type_p (context
))
3839 return build_typename_type (context
, name
, fullname
, tag_type
);
3841 want_template
= TREE_CODE (fullname
) == TEMPLATE_ID_EXPR
;
3845 if (complain
& tf_error
)
3847 if (!COMPLETE_TYPE_P (context
))
3848 cxx_incomplete_type_error (NULL_TREE
, context
);
3850 error (want_template
? G_("no class template named %q#T in %q#T")
3851 : G_("no type named %q#T in %q#T"), name
, context
);
3853 return error_mark_node
;
3856 /* Pull out the template from an injected-class-name (or multiple). */
3858 t
= maybe_get_template_decl_from_type_decl (t
);
3860 if (TREE_CODE (t
) == TREE_LIST
)
3862 if (complain
& tf_error
)
3864 error ("lookup of %qT in %qT is ambiguous", name
, context
);
3865 print_candidates (t
);
3867 return error_mark_node
;
3870 if (want_template
&& !DECL_TYPE_TEMPLATE_P (t
))
3872 if (complain
& tf_error
)
3873 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3875 return error_mark_node
;
3877 if (!want_template
&& TREE_CODE (t
) != TYPE_DECL
)
3879 if (complain
& tf_error
)
3880 error ("%<typename %T::%D%> names %q#T, which is not a type",
3882 return error_mark_node
;
3885 if (!perform_or_defer_access_check (TYPE_BINFO (context
), t
, t
, complain
))
3886 return error_mark_node
;
3888 /* If we are currently parsing a template and if T is a typedef accessed
3889 through CONTEXT then we need to remember and check access of T at
3890 template instantiation time. */
3891 add_typedef_to_current_template_for_access_check (t
, context
, input_location
);
3894 return lookup_template_class (t
, TREE_OPERAND (fullname
, 1),
3896 /*entering_scope=*/0,
3897 complain
| tf_user
);
3899 if (DECL_ARTIFICIAL (t
) || !(complain
& tf_keep_type_decl
))
3902 maybe_record_typedef_use (t
);
3907 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3908 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3909 in which case error_mark_node is returned.
3911 If PARM_LIST is non-NULL, also make sure that the template parameter
3912 list of TEMPLATE_DECL matches.
3914 If COMPLAIN zero, don't complain about any errors that occur. */
3917 make_unbound_class_template (tree context
, tree name
, tree parm_list
,
3918 tsubst_flags_t complain
)
3924 name
= TYPE_IDENTIFIER (name
);
3925 else if (DECL_P (name
))
3926 name
= DECL_NAME (name
);
3927 gcc_assert (identifier_p (name
));
3929 if (!dependent_type_p (context
)
3930 || currently_open_class (context
))
3932 tree tmpl
= NULL_TREE
;
3934 if (MAYBE_CLASS_TYPE_P (context
))
3935 tmpl
= lookup_field (context
, name
, 0, false);
3937 if (tmpl
&& TREE_CODE (tmpl
) == TYPE_DECL
)
3938 tmpl
= maybe_get_template_decl_from_type_decl (tmpl
);
3940 if (!tmpl
|| !DECL_TYPE_TEMPLATE_P (tmpl
))
3942 if (complain
& tf_error
)
3943 error ("no class template named %q#T in %q#T", name
, context
);
3944 return error_mark_node
;
3948 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl
), parm_list
))
3950 if (complain
& tf_error
)
3952 error ("template parameters do not match template %qD", tmpl
);
3953 inform (DECL_SOURCE_LOCATION (tmpl
),
3954 "%qD declared here", tmpl
);
3956 return error_mark_node
;
3959 if (!perform_or_defer_access_check (TYPE_BINFO (context
), tmpl
, tmpl
,
3961 return error_mark_node
;
3966 /* Build the UNBOUND_CLASS_TEMPLATE. */
3967 t
= cxx_make_type (UNBOUND_CLASS_TEMPLATE
);
3968 TYPE_CONTEXT (t
) = FROB_CONTEXT (context
);
3969 TREE_TYPE (t
) = NULL_TREE
;
3970 SET_TYPE_STRUCTURAL_EQUALITY (t
);
3972 /* Build the corresponding TEMPLATE_DECL. */
3973 d
= build_decl (input_location
, TEMPLATE_DECL
, name
, t
);
3974 TYPE_NAME (TREE_TYPE (d
)) = d
;
3975 TYPE_STUB_DECL (TREE_TYPE (d
)) = d
;
3976 DECL_CONTEXT (d
) = FROB_CONTEXT (context
);
3977 DECL_ARTIFICIAL (d
) = 1;
3978 DECL_TEMPLATE_PARMS (d
) = parm_list
;
3985 /* Push the declarations of builtin types into the global namespace.
3986 RID_INDEX is the index of the builtin type in the array
3987 RID_POINTERS. NAME is the name used when looking up the builtin
3988 type. TYPE is the _TYPE node for the builtin type.
3990 The calls to set_global_binding below should be
3991 eliminated. Built-in types should not be looked up name; their
3992 names are keywords that the parser can recognize. However, there
3993 is code in c-common.c that uses identifier_global_value to look up
3994 built-in types by name. */
3997 record_builtin_type (enum rid rid_index
,
4001 tree decl
= NULL_TREE
;
4005 tree tname
= get_identifier (name
);
4006 tree tdecl
= build_decl (BUILTINS_LOCATION
, TYPE_DECL
, tname
, type
);
4007 DECL_ARTIFICIAL (tdecl
) = 1;
4008 set_global_binding (tdecl
);
4012 if ((int) rid_index
< (int) RID_MAX
)
4013 if (tree rname
= ridpointers
[(int) rid_index
])
4014 if (!decl
|| DECL_NAME (decl
) != rname
)
4016 tree rdecl
= build_decl (BUILTINS_LOCATION
, TYPE_DECL
, rname
, type
);
4017 DECL_ARTIFICIAL (rdecl
) = 1;
4018 set_global_binding (rdecl
);
4025 if (!TYPE_NAME (type
))
4026 TYPE_NAME (type
) = decl
;
4027 debug_hooks
->type_decl (decl
, 0);
4031 /* Push a type into the namespace so that the back ends ignore it. */
4034 record_unknown_type (tree type
, const char* name
)
4036 tree decl
= pushdecl (build_decl (UNKNOWN_LOCATION
,
4037 TYPE_DECL
, get_identifier (name
), type
));
4038 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
4039 DECL_IGNORED_P (decl
) = 1;
4040 TYPE_DECL_SUPPRESS_DEBUG (decl
) = 1;
4041 TYPE_SIZE (type
) = TYPE_SIZE (void_type_node
);
4042 SET_TYPE_ALIGN (type
, 1);
4043 TYPE_USER_ALIGN (type
) = 0;
4044 SET_TYPE_MODE (type
, TYPE_MODE (void_type_node
));
4047 /* Create all the predefined identifiers. */
4050 initialize_predefined_identifiers (void)
4052 struct predefined_identifier
4054 const char *name
; /* Name. */
4055 tree
*node
; /* Node to store it in. */
4056 cp_identifier_kind kind
; /* Kind of identifier. */
4059 /* A table of identifiers to create at startup. */
4060 static const predefined_identifier predefined_identifiers
[] = {
4061 {"C++", &lang_name_cplusplus
, cik_normal
},
4062 {"C", &lang_name_c
, cik_normal
},
4063 /* Some of these names have a trailing space so that it is
4064 impossible for them to conflict with names written by users. */
4065 {"__ct ", &ctor_identifier
, cik_ctor
},
4066 {"__ct_base ", &base_ctor_identifier
, cik_ctor
},
4067 {"__ct_comp ", &complete_ctor_identifier
, cik_ctor
},
4068 {"__dt ", &dtor_identifier
, cik_dtor
},
4069 {"__dt_base ", &base_dtor_identifier
, cik_dtor
},
4070 {"__dt_comp ", &complete_dtor_identifier
, cik_dtor
},
4071 {"__dt_del ", &deleting_dtor_identifier
, cik_dtor
},
4072 {"__conv_op ", &conv_op_identifier
, cik_conv_op
},
4073 {"__in_chrg", &in_charge_identifier
, cik_normal
},
4074 {"this", &this_identifier
, cik_normal
},
4075 {"__delta", &delta_identifier
, cik_normal
},
4076 {"__pfn", &pfn_identifier
, cik_normal
},
4077 {"_vptr", &vptr_identifier
, cik_normal
},
4078 {"__vtt_parm", &vtt_parm_identifier
, cik_normal
},
4079 {"::", &global_identifier
, cik_normal
},
4080 {"std", &std_identifier
, cik_normal
},
4081 /* The demangler expects anonymous namespaces to be called
4082 something starting with '_GLOBAL__N_'. It no longer needs
4083 to be unique to the TU. */
4084 {"_GLOBAL__N_1", &anon_identifier
, cik_normal
},
4085 {"auto", &auto_identifier
, cik_normal
},
4086 {"decltype(auto)", &decltype_auto_identifier
, cik_normal
},
4087 {"initializer_list", &init_list_identifier
, cik_normal
},
4088 {"__for_range ", &for_range__identifier
, cik_normal
},
4089 {"__for_begin ", &for_begin__identifier
, cik_normal
},
4090 {"__for_end ", &for_end__identifier
, cik_normal
},
4091 {"__for_range", &for_range_identifier
, cik_normal
},
4092 {"__for_begin", &for_begin_identifier
, cik_normal
},
4093 {"__for_end", &for_end_identifier
, cik_normal
},
4094 {"abi_tag", &abi_tag_identifier
, cik_normal
},
4095 {"aligned", &aligned_identifier
, cik_normal
},
4096 {"begin", &begin_identifier
, cik_normal
},
4097 {"end", &end_identifier
, cik_normal
},
4098 {"get", &get__identifier
, cik_normal
},
4099 {"gnu", &gnu_identifier
, cik_normal
},
4100 {"tuple_element", &tuple_element_identifier
, cik_normal
},
4101 {"tuple_size", &tuple_size_identifier
, cik_normal
},
4102 {"type", &type_identifier
, cik_normal
},
4103 {"value", &value_identifier
, cik_normal
},
4104 {"_FUN", &fun_identifier
, cik_normal
},
4105 {"__closure", &closure_identifier
, cik_normal
},
4106 {NULL
, NULL
, cik_normal
}
4109 for (const predefined_identifier
*pid
= predefined_identifiers
;
4112 *pid
->node
= get_identifier (pid
->name
);
4113 /* Some of these identifiers already have a special kind. */
4114 if (pid
->kind
!= cik_normal
)
4115 set_identifier_kind (*pid
->node
, pid
->kind
);
4119 /* Create the predefined scalar types of C,
4120 and some nodes representing standard constants (0, 1, (void *)0).
4121 Initialize the global binding level.
4122 Make definitions for built-in primitive functions. */
4125 cxx_init_decl_processing (void)
4128 tree void_ftype_ptr
;
4130 /* Create all the identifiers we need. */
4131 initialize_predefined_identifiers ();
4133 /* Create the global variables. */
4134 push_to_top_level ();
4136 current_function_decl
= NULL_TREE
;
4137 current_binding_level
= NULL
;
4138 /* Enter the global namespace. */
4139 gcc_assert (global_namespace
== NULL_TREE
);
4140 global_namespace
= build_lang_decl (NAMESPACE_DECL
, global_identifier
,
4142 TREE_PUBLIC (global_namespace
) = 1;
4143 DECL_CONTEXT (global_namespace
)
4144 = build_translation_unit_decl (get_identifier (main_input_filename
));
4145 /* Remember whether we want the empty class passing ABI change warning
4147 TRANSLATION_UNIT_WARN_EMPTY_P (DECL_CONTEXT (global_namespace
))
4148 = warn_abi
&& abi_version_crosses (12);
4149 debug_hooks
->register_main_translation_unit
4150 (DECL_CONTEXT (global_namespace
));
4151 begin_scope (sk_namespace
, global_namespace
);
4152 current_namespace
= global_namespace
;
4154 if (flag_visibility_ms_compat
)
4155 default_visibility
= VISIBILITY_HIDDEN
;
4158 current_lang_name
= lang_name_c
;
4160 /* Create the `std' namespace. */
4161 push_namespace (std_identifier
);
4162 std_node
= current_namespace
;
4165 flag_noexcept_type
= (cxx_dialect
>= cxx17
);
4167 c_common_nodes_and_builtins ();
4169 tree bool_ftype
= build_function_type_list (boolean_type_node
, NULL_TREE
);
4171 = add_builtin_function ("__builtin_is_constant_evaluated",
4172 bool_ftype
, CP_BUILT_IN_IS_CONSTANT_EVALUATED
,
4173 BUILT_IN_FRONTEND
, NULL
, NULL_TREE
);
4174 set_call_expr_flags (decl
, ECF_CONST
| ECF_NOTHROW
| ECF_LEAF
);
4176 integer_two_node
= build_int_cst (NULL_TREE
, 2);
4178 /* Guess at the initial static decls size. */
4179 vec_alloc (static_decls
, 500);
4181 /* ... and keyed classes. */
4182 vec_alloc (keyed_classes
, 100);
4184 record_builtin_type (RID_BOOL
, "bool", boolean_type_node
);
4185 truthvalue_type_node
= boolean_type_node
;
4186 truthvalue_false_node
= boolean_false_node
;
4187 truthvalue_true_node
= boolean_true_node
;
4189 empty_except_spec
= build_tree_list (NULL_TREE
, NULL_TREE
);
4190 noexcept_true_spec
= build_tree_list (boolean_true_node
, NULL_TREE
);
4191 noexcept_false_spec
= build_tree_list (boolean_false_node
, NULL_TREE
);
4192 noexcept_deferred_spec
= build_tree_list (make_node (DEFERRED_NOEXCEPT
),
4196 record_builtin_type (RID_MAX
, NULL
, string_type_node
);
4199 delta_type_node
= ptrdiff_type_node
;
4200 vtable_index_type
= ptrdiff_type_node
;
4202 vtt_parm_type
= build_pointer_type (const_ptr_type_node
);
4203 void_ftype
= build_function_type_list (void_type_node
, NULL_TREE
);
4204 void_ftype_ptr
= build_function_type_list (void_type_node
,
4205 ptr_type_node
, NULL_TREE
);
4207 = build_exception_variant (void_ftype_ptr
, empty_except_spec
);
4209 /* Create the conversion operator marker. This operator's DECL_NAME
4210 is in the identifier table, so we can use identifier equality to
4212 conv_op_marker
= build_lang_decl (FUNCTION_DECL
, conv_op_identifier
,
4215 /* C++ extensions */
4217 unknown_type_node
= make_node (LANG_TYPE
);
4218 record_unknown_type (unknown_type_node
, "unknown type");
4220 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
4221 TREE_TYPE (unknown_type_node
) = unknown_type_node
;
4223 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
4225 TYPE_POINTER_TO (unknown_type_node
) = unknown_type_node
;
4226 TYPE_REFERENCE_TO (unknown_type_node
) = unknown_type_node
;
4228 init_list_type_node
= make_node (LANG_TYPE
);
4229 record_unknown_type (init_list_type_node
, "init list");
4232 /* Make sure we get a unique function type, so we can give
4233 its pointer type a name. (This wins for gdb.) */
4234 tree vfunc_type
= make_node (FUNCTION_TYPE
);
4235 TREE_TYPE (vfunc_type
) = integer_type_node
;
4236 TYPE_ARG_TYPES (vfunc_type
) = NULL_TREE
;
4237 layout_type (vfunc_type
);
4239 vtable_entry_type
= build_pointer_type (vfunc_type
);
4241 record_builtin_type (RID_MAX
, "__vtbl_ptr_type", vtable_entry_type
);
4244 = build_cplus_array_type (vtable_entry_type
, NULL_TREE
);
4245 layout_type (vtbl_type_node
);
4246 vtbl_type_node
= cp_build_qualified_type (vtbl_type_node
, TYPE_QUAL_CONST
);
4247 record_builtin_type (RID_MAX
, NULL
, vtbl_type_node
);
4248 vtbl_ptr_type_node
= build_pointer_type (vtable_entry_type
);
4249 layout_type (vtbl_ptr_type_node
);
4250 record_builtin_type (RID_MAX
, NULL
, vtbl_ptr_type_node
);
4252 push_namespace (get_identifier ("__cxxabiv1"));
4253 abi_node
= current_namespace
;
4256 global_type_node
= make_node (LANG_TYPE
);
4257 record_unknown_type (global_type_node
, "global type");
4259 any_targ_node
= make_node (LANG_TYPE
);
4260 record_unknown_type (any_targ_node
, "any type");
4263 current_lang_name
= lang_name_cplusplus
;
4265 if (aligned_new_threshold
> 1
4266 && !pow2p_hwi (aligned_new_threshold
))
4268 error ("-faligned-new=%d is not a power of two", aligned_new_threshold
);
4269 aligned_new_threshold
= 1;
4271 if (aligned_new_threshold
== -1)
4272 aligned_new_threshold
= (cxx_dialect
>= cxx17
) ? 1 : 0;
4273 if (aligned_new_threshold
== 1)
4274 aligned_new_threshold
= malloc_alignment () / BITS_PER_UNIT
;
4277 tree newattrs
, extvisattr
;
4278 tree newtype
, deltype
;
4279 tree ptr_ftype_sizetype
;
4283 = build_function_type_list (ptr_type_node
, size_type_node
, NULL_TREE
);
4284 if (cxx_dialect
== cxx98
)
4287 tree bad_alloc_type_node
;
4288 tree bad_alloc_decl
;
4290 push_namespace (std_identifier
);
4291 bad_alloc_id
= get_identifier ("bad_alloc");
4292 bad_alloc_type_node
= make_class_type (RECORD_TYPE
);
4293 TYPE_CONTEXT (bad_alloc_type_node
) = current_namespace
;
4295 = create_implicit_typedef (bad_alloc_id
, bad_alloc_type_node
);
4296 DECL_CONTEXT (bad_alloc_decl
) = current_namespace
;
4300 = add_exception_specifier (NULL_TREE
, bad_alloc_type_node
, -1);
4303 new_eh_spec
= noexcept_false_spec
;
4305 /* Ensure attribs.c is initialized. */
4308 /* Ensure constraint.cc is initialized. */
4309 init_constraint_processing ();
4311 extvisattr
= build_tree_list (get_identifier ("externally_visible"),
4313 newattrs
= tree_cons (get_identifier ("alloc_size"),
4314 build_tree_list (NULL_TREE
, integer_one_node
),
4316 newtype
= cp_build_type_attribute_variant (ptr_ftype_sizetype
, newattrs
);
4317 newtype
= build_exception_variant (newtype
, new_eh_spec
);
4318 deltype
= cp_build_type_attribute_variant (void_ftype_ptr
, extvisattr
);
4319 deltype
= build_exception_variant (deltype
, empty_except_spec
);
4320 tree opnew
= push_cp_library_fn (NEW_EXPR
, newtype
, 0);
4321 DECL_IS_MALLOC (opnew
) = 1;
4322 DECL_IS_OPERATOR_NEW (opnew
) = 1;
4323 opnew
= push_cp_library_fn (VEC_NEW_EXPR
, newtype
, 0);
4324 DECL_IS_MALLOC (opnew
) = 1;
4325 DECL_IS_OPERATOR_NEW (opnew
) = 1;
4326 push_cp_library_fn (DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4327 push_cp_library_fn (VEC_DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4328 if (flag_sized_deallocation
)
4330 /* Also push the sized deallocation variants:
4331 void operator delete(void*, std::size_t) throw();
4332 void operator delete[](void*, std::size_t) throw(); */
4333 tree void_ftype_ptr_size
4334 = build_function_type_list (void_type_node
, ptr_type_node
,
4335 size_type_node
, NULL_TREE
);
4336 deltype
= cp_build_type_attribute_variant (void_ftype_ptr_size
,
4338 deltype
= build_exception_variant (deltype
, empty_except_spec
);
4339 push_cp_library_fn (DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4340 push_cp_library_fn (VEC_DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4343 if (aligned_new_threshold
)
4345 push_namespace (std_identifier
);
4346 tree align_id
= get_identifier ("align_val_t");
4347 align_type_node
= start_enum (align_id
, NULL_TREE
, size_type_node
,
4348 NULL_TREE
, /*scoped*/true, NULL
);
4351 /* operator new (size_t, align_val_t); */
4352 newtype
= build_function_type_list (ptr_type_node
, size_type_node
,
4353 align_type_node
, NULL_TREE
);
4354 newtype
= cp_build_type_attribute_variant (newtype
, newattrs
);
4355 newtype
= build_exception_variant (newtype
, new_eh_spec
);
4356 opnew
= push_cp_library_fn (NEW_EXPR
, newtype
, 0);
4357 DECL_IS_MALLOC (opnew
) = 1;
4358 DECL_IS_OPERATOR_NEW (opnew
) = 1;
4359 opnew
= push_cp_library_fn (VEC_NEW_EXPR
, newtype
, 0);
4360 DECL_IS_MALLOC (opnew
) = 1;
4361 DECL_IS_OPERATOR_NEW (opnew
) = 1;
4363 /* operator delete (void *, align_val_t); */
4364 deltype
= build_function_type_list (void_type_node
, ptr_type_node
,
4365 align_type_node
, NULL_TREE
);
4366 deltype
= cp_build_type_attribute_variant (deltype
, extvisattr
);
4367 deltype
= build_exception_variant (deltype
, empty_except_spec
);
4368 push_cp_library_fn (DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4369 push_cp_library_fn (VEC_DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4371 if (flag_sized_deallocation
)
4373 /* operator delete (void *, size_t, align_val_t); */
4374 deltype
= build_function_type_list (void_type_node
, ptr_type_node
,
4375 size_type_node
, align_type_node
,
4377 deltype
= cp_build_type_attribute_variant (deltype
, extvisattr
);
4378 deltype
= build_exception_variant (deltype
, empty_except_spec
);
4379 push_cp_library_fn (DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4380 push_cp_library_fn (VEC_DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4384 nullptr_type_node
= make_node (NULLPTR_TYPE
);
4385 TYPE_SIZE (nullptr_type_node
) = bitsize_int (GET_MODE_BITSIZE (ptr_mode
));
4386 TYPE_SIZE_UNIT (nullptr_type_node
) = size_int (GET_MODE_SIZE (ptr_mode
));
4387 TYPE_UNSIGNED (nullptr_type_node
) = 1;
4388 TYPE_PRECISION (nullptr_type_node
) = GET_MODE_BITSIZE (ptr_mode
);
4389 if (abi_version_at_least (9))
4390 SET_TYPE_ALIGN (nullptr_type_node
, GET_MODE_ALIGNMENT (ptr_mode
));
4391 SET_TYPE_MODE (nullptr_type_node
, ptr_mode
);
4392 record_builtin_type (RID_MAX
, "decltype(nullptr)", nullptr_type_node
);
4393 nullptr_node
= build_int_cst (nullptr_type_node
, 0);
4397 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype
,
4398 ECF_NORETURN
| ECF_NOTHROW
| ECF_COLD
);
4400 /* Perform other language dependent initializations. */
4401 init_class_processing ();
4402 init_rtti_processing ();
4403 init_template_processing ();
4405 if (flag_exceptions
)
4406 init_exception_processing ();
4408 if (! supports_one_only ())
4411 make_fname_decl
= cp_make_fname_decl
;
4412 start_fname_decls ();
4414 /* Show we use EH for cleanups. */
4415 if (flag_exceptions
)
4416 using_eh_for_cleanups ();
4419 /* Generate an initializer for a function naming variable from
4420 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
4421 filled in with the type of the init. */
4424 cp_fname_init (const char* name
, tree
*type_p
)
4426 tree domain
= NULL_TREE
;
4428 tree init
= NULL_TREE
;
4433 length
= strlen (name
);
4434 domain
= build_index_type (size_int (length
));
4435 init
= build_string (length
+ 1, name
);
4438 type
= cp_build_qualified_type (char_type_node
, TYPE_QUAL_CONST
);
4439 type
= build_cplus_array_type (type
, domain
);
4444 TREE_TYPE (init
) = type
;
4446 init
= error_mark_node
;
4451 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
4452 the decl, LOC is the location to give the decl, NAME is the
4453 initialization string and TYPE_DEP indicates whether NAME depended
4454 on the type of the function. We make use of that to detect
4455 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
4456 at the point of first use, so we mustn't push the decl now. */
4459 cp_make_fname_decl (location_t loc
, tree id
, int type_dep
)
4461 const char *const name
= (type_dep
&& in_template_function ()
4462 ? NULL
: fname_as_string (type_dep
));
4464 tree init
= cp_fname_init (name
, &type
);
4465 tree decl
= build_decl (loc
, VAR_DECL
, id
, type
);
4468 free (CONST_CAST (char *, name
));
4470 /* As we're using pushdecl_with_scope, we must set the context. */
4471 DECL_CONTEXT (decl
) = current_function_decl
;
4473 TREE_READONLY (decl
) = 1;
4474 DECL_ARTIFICIAL (decl
) = 1;
4475 DECL_DECLARED_CONSTEXPR_P (decl
) = 1;
4476 TREE_STATIC (decl
) = 1;
4478 TREE_USED (decl
) = 1;
4482 SET_DECL_VALUE_EXPR (decl
, init
);
4483 DECL_HAS_VALUE_EXPR_P (decl
) = 1;
4484 /* For decl_constant_var_p. */
4485 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
) = 1;
4488 if (current_function_decl
)
4490 DECL_CONTEXT (decl
) = current_function_decl
;
4491 decl
= pushdecl_outermost_localscope (decl
);
4492 if (decl
!= error_mark_node
)
4493 add_decl_expr (decl
);
4497 DECL_THIS_STATIC (decl
) = true;
4498 pushdecl_top_level_and_finish (decl
, NULL_TREE
);
4505 builtin_function_1 (tree decl
, tree context
, bool is_global
)
4507 tree id
= DECL_NAME (decl
);
4508 const char *name
= IDENTIFIER_POINTER (id
);
4510 retrofit_lang_decl (decl
);
4512 DECL_ARTIFICIAL (decl
) = 1;
4513 SET_DECL_LANGUAGE (decl
, lang_c
);
4514 /* Runtime library routines are, by definition, available in an
4515 external shared object. */
4516 DECL_VISIBILITY (decl
) = VISIBILITY_DEFAULT
;
4517 DECL_VISIBILITY_SPECIFIED (decl
) = 1;
4519 DECL_CONTEXT (decl
) = context
;
4521 /* A function in the user's namespace should have an explicit
4522 declaration before it is used. Mark the built-in function as
4523 anticipated but not actually declared. */
4524 if (name
[0] != '_' || name
[1] != '_')
4525 DECL_ANTICIPATED (decl
) = 1;
4526 else if (strncmp (name
+ 2, "builtin_", strlen ("builtin_")) != 0)
4528 size_t len
= strlen (name
);
4530 /* Treat __*_chk fortification functions as anticipated as well,
4531 unless they are __builtin_*. */
4532 if (len
> strlen ("___chk")
4533 && memcmp (name
+ len
- strlen ("_chk"),
4534 "_chk", strlen ("_chk") + 1) == 0)
4535 DECL_ANTICIPATED (decl
) = 1;
4539 return pushdecl_top_level (decl
);
4541 return pushdecl (decl
);
4545 cxx_builtin_function (tree decl
)
4547 tree id
= DECL_NAME (decl
);
4548 const char *name
= IDENTIFIER_POINTER (id
);
4549 /* All builtins that don't begin with an '_' should additionally
4550 go in the 'std' namespace. */
4553 tree decl2
= copy_node(decl
);
4554 push_namespace (std_identifier
);
4555 builtin_function_1 (decl2
, std_node
, false);
4559 return builtin_function_1 (decl
, NULL_TREE
, false);
4562 /* Like cxx_builtin_function, but guarantee the function is added to the global
4563 scope. This is to allow function specific options to add new machine
4564 dependent builtins when the target ISA changes via attribute((target(...)))
4565 which saves space on program startup if the program does not use non-generic
4569 cxx_builtin_function_ext_scope (tree decl
)
4572 tree id
= DECL_NAME (decl
);
4573 const char *name
= IDENTIFIER_POINTER (id
);
4574 /* All builtins that don't begin with an '_' should additionally
4575 go in the 'std' namespace. */
4578 tree decl2
= copy_node(decl
);
4579 push_namespace (std_identifier
);
4580 builtin_function_1 (decl2
, std_node
, true);
4584 return builtin_function_1 (decl
, NULL_TREE
, true);
4587 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
4588 function. Not called directly. */
4591 build_library_fn (tree name
, enum tree_code operator_code
, tree type
,
4594 tree fn
= build_lang_decl (FUNCTION_DECL
, name
, type
);
4595 DECL_EXTERNAL (fn
) = 1;
4596 TREE_PUBLIC (fn
) = 1;
4597 DECL_ARTIFICIAL (fn
) = 1;
4598 DECL_OVERLOADED_OPERATOR_CODE_RAW (fn
)
4599 = OVL_OP_INFO (false, operator_code
)->ovl_op_code
;
4600 SET_DECL_LANGUAGE (fn
, lang_c
);
4601 /* Runtime library routines are, by definition, available in an
4602 external shared object. */
4603 DECL_VISIBILITY (fn
) = VISIBILITY_DEFAULT
;
4604 DECL_VISIBILITY_SPECIFIED (fn
) = 1;
4605 set_call_expr_flags (fn
, ecf_flags
);
4609 /* Returns the _DECL for a library function with C++ linkage. */
4612 build_cp_library_fn (tree name
, enum tree_code operator_code
, tree type
,
4615 tree fn
= build_library_fn (name
, operator_code
, type
, ecf_flags
);
4616 DECL_CONTEXT (fn
) = FROB_CONTEXT (current_namespace
);
4617 SET_DECL_LANGUAGE (fn
, lang_cplusplus
);
4621 /* Like build_library_fn, but takes a C string instead of an
4625 build_library_fn_ptr (const char* name
, tree type
, int ecf_flags
)
4627 return build_library_fn (get_identifier (name
), ERROR_MARK
, type
, ecf_flags
);
4630 /* Like build_cp_library_fn, but takes a C string instead of an
4634 build_cp_library_fn_ptr (const char* name
, tree type
, int ecf_flags
)
4636 return build_cp_library_fn (get_identifier (name
), ERROR_MARK
, type
,
4640 /* Like build_library_fn, but also pushes the function so that we will
4641 be able to find it via get_global_binding. Also, the function
4642 may throw exceptions listed in RAISES. */
4645 push_library_fn (tree name
, tree type
, tree raises
, int ecf_flags
)
4650 type
= build_exception_variant (type
, raises
);
4652 fn
= build_library_fn (name
, ERROR_MARK
, type
, ecf_flags
);
4653 pushdecl_top_level (fn
);
4657 /* Like build_cp_library_fn, but also pushes the function so that it
4658 will be found by normal lookup. */
4661 push_cp_library_fn (enum tree_code operator_code
, tree type
,
4664 tree fn
= build_cp_library_fn (ovl_op_identifier (false, operator_code
),
4665 operator_code
, type
, ecf_flags
);
4668 apply_tm_attr (fn
, get_identifier ("transaction_safe"));
4672 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
4676 push_void_library_fn (tree name
, tree parmtypes
, int ecf_flags
)
4678 tree type
= build_function_type (void_type_node
, parmtypes
);
4679 return push_library_fn (name
, type
, NULL_TREE
, ecf_flags
);
4682 /* Like push_library_fn, but also note that this function throws
4683 and does not return. Used for __throw_foo and the like. */
4686 push_throw_library_fn (tree name
, tree type
)
4688 tree fn
= push_library_fn (name
, type
, NULL_TREE
, ECF_NORETURN
| ECF_COLD
);
4692 /* When we call finish_struct for an anonymous union, we create
4693 default copy constructors and such. But, an anonymous union
4694 shouldn't have such things; this function undoes the damage to the
4695 anonymous union type T.
4697 (The reason that we create the synthesized methods is that we don't
4698 distinguish `union { int i; }' from `typedef union { int i; } U'.
4699 The first is an anonymous union; the second is just an ordinary
4703 fixup_anonymous_aggr (tree t
)
4705 /* Wipe out memory of synthesized methods. */
4706 TYPE_HAS_USER_CONSTRUCTOR (t
) = 0;
4707 TYPE_HAS_DEFAULT_CONSTRUCTOR (t
) = 0;
4708 TYPE_HAS_COPY_CTOR (t
) = 0;
4709 TYPE_HAS_CONST_COPY_CTOR (t
) = 0;
4710 TYPE_HAS_COPY_ASSIGN (t
) = 0;
4711 TYPE_HAS_CONST_COPY_ASSIGN (t
) = 0;
4713 /* Splice the implicitly generated functions out of TYPE_FIELDS. */
4714 for (tree probe
, *prev_p
= &TYPE_FIELDS (t
); (probe
= *prev_p
);)
4715 if (TREE_CODE (probe
) == FUNCTION_DECL
&& DECL_ARTIFICIAL (probe
))
4716 *prev_p
= DECL_CHAIN (probe
);
4718 prev_p
= &DECL_CHAIN (probe
);
4720 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
4721 assignment operators (because they cannot have these methods themselves).
4722 For anonymous unions this is already checked because they are not allowed
4723 in any union, otherwise we have to check it. */
4724 if (TREE_CODE (t
) != UNION_TYPE
)
4728 for (field
= TYPE_FIELDS (t
); field
; field
= DECL_CHAIN (field
))
4729 if (TREE_CODE (field
) == FIELD_DECL
)
4731 type
= TREE_TYPE (field
);
4732 if (CLASS_TYPE_P (type
))
4734 if (TYPE_NEEDS_CONSTRUCTING (type
))
4735 error ("member %q+#D with constructor not allowed "
4736 "in anonymous aggregate", field
);
4737 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
))
4738 error ("member %q+#D with destructor not allowed "
4739 "in anonymous aggregate", field
);
4740 if (TYPE_HAS_COMPLEX_COPY_ASSIGN (type
))
4741 error ("member %q+#D with copy assignment operator "
4742 "not allowed in anonymous aggregate", field
);
4748 /* Warn for an attribute located at LOCATION that appertains to the
4749 class type CLASS_TYPE that has not been properly placed after its
4750 class-key, in it class-specifier. */
4753 warn_misplaced_attr_for_class_type (location_t location
,
4756 gcc_assert (OVERLOAD_TYPE_P (class_type
));
4758 auto_diagnostic_group d
;
4759 if (warning_at (location
, OPT_Wattributes
,
4760 "attribute ignored in declaration "
4761 "of %q#T", class_type
))
4763 "attribute for %q#T must follow the %qs keyword",
4764 class_type
, class_key_or_enum_as_string (class_type
));
4767 /* Make sure that a declaration with no declarator is well-formed, i.e.
4768 just declares a tagged type or anonymous union.
4770 Returns the type declared; or NULL_TREE if none. */
4773 check_tag_decl (cp_decl_specifier_seq
*declspecs
,
4774 bool explicit_type_instantiation_p
)
4776 int saw_friend
= decl_spec_seq_has_spec_p (declspecs
, ds_friend
);
4777 int saw_typedef
= decl_spec_seq_has_spec_p (declspecs
, ds_typedef
);
4778 /* If a class, struct, or enum type is declared by the DECLSPECS
4779 (i.e, if a class-specifier, enum-specifier, or non-typename
4780 elaborated-type-specifier appears in the DECLSPECS),
4781 DECLARED_TYPE is set to the corresponding type. */
4782 tree declared_type
= NULL_TREE
;
4783 bool error_p
= false;
4785 if (declspecs
->multiple_types_p
)
4786 error ("multiple types in one declaration");
4787 else if (declspecs
->redefined_builtin_type
)
4789 if (!in_system_header_at (input_location
))
4790 permerror (declspecs
->locations
[ds_redefined_builtin_type_spec
],
4791 "redeclaration of C++ built-in type %qT",
4792 declspecs
->redefined_builtin_type
);
4797 && TYPE_P (declspecs
->type
)
4798 && ((TREE_CODE (declspecs
->type
) != TYPENAME_TYPE
4799 && MAYBE_CLASS_TYPE_P (declspecs
->type
))
4800 || TREE_CODE (declspecs
->type
) == ENUMERAL_TYPE
))
4801 declared_type
= declspecs
->type
;
4802 else if (declspecs
->type
== error_mark_node
)
4805 if (type_uses_auto (declared_type
))
4807 error_at (declspecs
->locations
[ds_type_spec
],
4808 "%<auto%> can only be specified for variables "
4809 "or function declarations");
4810 return error_mark_node
;
4813 if (declared_type
&& !OVERLOAD_TYPE_P (declared_type
))
4814 declared_type
= NULL_TREE
;
4816 if (!declared_type
&& !saw_friend
&& !error_p
)
4817 permerror (input_location
, "declaration does not declare anything");
4818 /* Check for an anonymous union. */
4819 else if (declared_type
&& RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type
))
4820 && TYPE_UNNAMED_P (declared_type
))
4822 /* 7/3 In a simple-declaration, the optional init-declarator-list
4823 can be omitted only when declaring a class (clause 9) or
4824 enumeration (7.2), that is, when the decl-specifier-seq contains
4825 either a class-specifier, an elaborated-type-specifier with
4826 a class-key (9.1), or an enum-specifier. In these cases and
4827 whenever a class-specifier or enum-specifier is present in the
4828 decl-specifier-seq, the identifiers in these specifiers are among
4829 the names being declared by the declaration (as class-name,
4830 enum-names, or enumerators, depending on the syntax). In such
4831 cases, and except for the declaration of an unnamed bit-field (9.6),
4832 the decl-specifier-seq shall introduce one or more names into the
4833 program, or shall redeclare a name introduced by a previous
4834 declaration. [Example:
4835 enum { }; // ill-formed
4836 typedef class { }; // ill-formed
4840 error ("missing type-name in typedef-declaration");
4843 /* Anonymous unions are objects, so they can have specifiers. */;
4844 SET_ANON_AGGR_TYPE_P (declared_type
);
4846 if (TREE_CODE (declared_type
) != UNION_TYPE
4847 && !in_system_header_at (input_location
))
4848 pedwarn (input_location
, OPT_Wpedantic
, "ISO C++ prohibits anonymous structs");
4853 if (decl_spec_seq_has_spec_p (declspecs
, ds_inline
))
4854 error_at (declspecs
->locations
[ds_inline
],
4855 "%<inline%> can only be specified for functions");
4856 else if (decl_spec_seq_has_spec_p (declspecs
, ds_virtual
))
4857 error_at (declspecs
->locations
[ds_virtual
],
4858 "%<virtual%> can only be specified for functions");
4860 && (!current_class_type
4861 || current_scope () != current_class_type
))
4862 error_at (declspecs
->locations
[ds_friend
],
4863 "%<friend%> can only be specified inside a class");
4864 else if (decl_spec_seq_has_spec_p (declspecs
, ds_explicit
))
4865 error_at (declspecs
->locations
[ds_explicit
],
4866 "%<explicit%> can only be specified for constructors");
4867 else if (declspecs
->storage_class
)
4868 error_at (declspecs
->locations
[ds_storage_class
],
4869 "a storage class can only be specified for objects "
4871 else if (decl_spec_seq_has_spec_p (declspecs
, ds_const
))
4872 error_at (declspecs
->locations
[ds_const
],
4873 "%<const%> can only be specified for objects and "
4875 else if (decl_spec_seq_has_spec_p (declspecs
, ds_volatile
))
4876 error_at (declspecs
->locations
[ds_volatile
],
4877 "%<volatile%> can only be specified for objects and "
4879 else if (decl_spec_seq_has_spec_p (declspecs
, ds_restrict
))
4880 error_at (declspecs
->locations
[ds_restrict
],
4881 "%<__restrict%> can only be specified for objects and "
4883 else if (decl_spec_seq_has_spec_p (declspecs
, ds_thread
))
4884 error_at (declspecs
->locations
[ds_thread
],
4885 "%<__thread%> can only be specified for objects "
4887 else if (saw_typedef
)
4888 warning_at (declspecs
->locations
[ds_typedef
], 0,
4889 "%<typedef%> was ignored in this declaration");
4890 else if (decl_spec_seq_has_spec_p (declspecs
, ds_constexpr
))
4891 error_at (declspecs
->locations
[ds_constexpr
],
4892 "%<constexpr%> cannot be used for type declarations");
4895 if (declspecs
->attributes
&& warn_attributes
&& declared_type
)
4898 if (!CLASS_TYPE_P (declared_type
)
4899 || !CLASSTYPE_TEMPLATE_INSTANTIATION (declared_type
))
4900 /* For a non-template class, use the name location. */
4901 loc
= location_of (declared_type
);
4903 /* For a template class (an explicit instantiation), use the
4904 current location. */
4905 loc
= input_location
;
4907 if (explicit_type_instantiation_p
)
4908 /* [dcl.attr.grammar]/4:
4910 No attribute-specifier-seq shall appertain to an explicit
4913 if (warning_at (loc
, OPT_Wattributes
,
4914 "attribute ignored in explicit instantiation %q#T",
4917 "no attribute can be applied to "
4918 "an explicit instantiation");
4921 warn_misplaced_attr_for_class_type (loc
, declared_type
);
4924 return declared_type
;
4927 /* Called when a declaration is seen that contains no names to declare.
4928 If its type is a reference to a structure, union or enum inherited
4929 from a containing scope, shadow that tag name for the current scope
4930 with a forward reference.
4931 If its type defines a new named structure or union
4932 or defines an enum, it is valid but we need not do anything here.
4933 Otherwise, it is an error.
4935 C++: may have to grok the declspecs to learn about static,
4936 complain for anonymous unions.
4938 Returns the TYPE declared -- or NULL_TREE if none. */
4941 shadow_tag (cp_decl_specifier_seq
*declspecs
)
4943 tree t
= check_tag_decl (declspecs
,
4944 /*explicit_type_instantiation_p=*/false);
4949 if (maybe_process_partial_specialization (t
) == error_mark_node
)
4952 /* This is where the variables in an anonymous union are
4953 declared. An anonymous union declaration looks like:
4955 because there is no declarator after the union, the parser
4956 sends that declaration here. */
4957 if (ANON_AGGR_TYPE_P (t
))
4959 fixup_anonymous_aggr (t
);
4961 if (TYPE_FIELDS (t
))
4963 tree decl
= grokdeclarator (/*declarator=*/NULL
,
4964 declspecs
, NORMAL
, 0, NULL
);
4965 finish_anon_union (decl
);
4972 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4975 groktypename (cp_decl_specifier_seq
*type_specifiers
,
4976 const cp_declarator
*declarator
,
4977 bool is_template_arg
)
4981 enum decl_context context
4982 = is_template_arg
? TEMPLATE_TYPE_ARG
: TYPENAME
;
4983 attrs
= type_specifiers
->attributes
;
4984 type_specifiers
->attributes
= NULL_TREE
;
4985 type
= grokdeclarator (declarator
, type_specifiers
, context
, 0, &attrs
);
4986 if (attrs
&& type
!= error_mark_node
)
4988 if (CLASS_TYPE_P (type
))
4989 warning (OPT_Wattributes
, "ignoring attributes applied to class type %qT "
4990 "outside of definition", type
);
4991 else if (MAYBE_CLASS_TYPE_P (type
))
4992 /* A template type parameter or other dependent type. */
4993 warning (OPT_Wattributes
, "ignoring attributes applied to dependent "
4994 "type %qT without an associated declaration", type
);
4996 cplus_decl_attributes (&type
, attrs
, 0);
5001 /* Process a DECLARATOR for a function-scope variable declaration,
5002 namespace-scope variable declaration, or function declaration.
5003 (Function definitions go through start_function; class member
5004 declarations appearing in the body of the class go through
5005 grokfield.) The DECL corresponding to the DECLARATOR is returned.
5006 If an error occurs, the error_mark_node is returned instead.
5008 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
5009 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
5010 for an explicitly defaulted function, or SD_DELETED for an explicitly
5011 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
5012 implicitly initialized via a default constructor. ATTRIBUTES and
5013 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
5015 The scope represented by the context of the returned DECL is pushed
5016 (if it is not the global namespace) and is assigned to
5017 *PUSHED_SCOPE_P. The caller is then responsible for calling
5018 pop_scope on *PUSHED_SCOPE_P if it is set. */
5021 start_decl (const cp_declarator
*declarator
,
5022 cp_decl_specifier_seq
*declspecs
,
5025 tree prefix_attributes
,
5026 tree
*pushed_scope_p
)
5034 *pushed_scope_p
= NULL_TREE
;
5036 /* An object declared as __attribute__((deprecated)) suppresses
5037 warnings of uses of other deprecated items. */
5038 if (lookup_attribute ("deprecated", attributes
))
5039 deprecated_state
= DEPRECATED_SUPPRESS
;
5041 attributes
= chainon (attributes
, prefix_attributes
);
5043 decl
= grokdeclarator (declarator
, declspecs
, NORMAL
, initialized
,
5046 deprecated_state
= DEPRECATED_NORMAL
;
5048 if (decl
== NULL_TREE
|| VOID_TYPE_P (decl
)
5049 || decl
== error_mark_node
)
5050 return error_mark_node
;
5052 context
= CP_DECL_CONTEXT (decl
);
5053 if (context
!= global_namespace
)
5054 *pushed_scope_p
= push_scope (context
);
5056 /* Is it valid for this decl to have an initializer at all?
5057 If not, set INITIALIZED to zero, which will indirectly
5058 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
5060 && TREE_CODE (decl
) == TYPE_DECL
)
5062 error ("typedef %qD is initialized (use decltype instead)", decl
);
5063 return error_mark_node
;
5068 if (! toplevel_bindings_p ()
5069 && DECL_EXTERNAL (decl
))
5070 warning (0, "declaration of %q#D has %<extern%> and is initialized",
5072 DECL_EXTERNAL (decl
) = 0;
5073 if (toplevel_bindings_p ())
5074 TREE_STATIC (decl
) = 1;
5076 alias
= lookup_attribute ("alias", DECL_ATTRIBUTES (decl
)) != 0;
5078 if (alias
&& TREE_CODE (decl
) == FUNCTION_DECL
)
5079 record_key_method_defined (decl
);
5081 /* If this is a typedef that names the class for linkage purposes
5082 (7.1.3p8), apply any attributes directly to the type. */
5083 if (TREE_CODE (decl
) == TYPE_DECL
5084 && OVERLOAD_TYPE_P (TREE_TYPE (decl
))
5085 && decl
== TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl
))))
5086 flags
= ATTR_FLAG_TYPE_IN_PLACE
;
5090 /* Set attributes here so if duplicate decl, will have proper attributes. */
5091 cplus_decl_attributes (&decl
, attributes
, flags
);
5093 /* Dllimported symbols cannot be defined. Static data members (which
5094 can be initialized in-class and dllimported) go through grokfield,
5095 not here, so we don't need to exclude those decls when checking for
5097 if (initialized
&& DECL_DLLIMPORT_P (decl
))
5099 error ("definition of %q#D is marked %<dllimport%>", decl
);
5100 DECL_DLLIMPORT_P (decl
) = 0;
5103 /* If #pragma weak was used, mark the decl weak now. */
5104 if (!processing_template_decl
&& !DECL_DECOMPOSITION_P (decl
))
5105 maybe_apply_pragma_weak (decl
);
5107 if (TREE_CODE (decl
) == FUNCTION_DECL
5108 && DECL_DECLARED_INLINE_P (decl
)
5109 && DECL_UNINLINABLE (decl
)
5110 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl
)))
5111 warning_at (DECL_SOURCE_LOCATION (decl
), 0,
5112 "inline function %qD given attribute noinline", decl
);
5114 if (TYPE_P (context
) && COMPLETE_TYPE_P (complete_type (context
)))
5116 bool this_tmpl
= (processing_template_decl
5117 > template_class_depth (context
));
5120 tree field
= lookup_field (context
, DECL_NAME (decl
), 0, false);
5121 if (field
== NULL_TREE
5122 || !(VAR_P (field
) || variable_template_p (field
)))
5123 error ("%q+#D is not a static data member of %q#T", decl
, context
);
5124 else if (variable_template_p (field
)
5125 && (DECL_LANG_SPECIFIC (decl
)
5126 && DECL_TEMPLATE_SPECIALIZATION (decl
)))
5127 /* OK, specialization was already checked. */;
5128 else if (variable_template_p (field
) && !this_tmpl
)
5130 error_at (DECL_SOURCE_LOCATION (decl
),
5131 "non-member-template declaration of %qD", decl
);
5132 inform (DECL_SOURCE_LOCATION (field
), "does not match "
5133 "member template declaration here");
5134 return error_mark_node
;
5138 if (variable_template_p (field
))
5139 field
= DECL_TEMPLATE_RESULT (field
);
5141 if (DECL_CONTEXT (field
) != context
)
5143 if (!same_type_p (DECL_CONTEXT (field
), context
))
5144 permerror (input_location
, "ISO C++ does not permit %<%T::%D%> "
5145 "to be defined as %<%T::%D%>",
5146 DECL_CONTEXT (field
), DECL_NAME (decl
),
5147 context
, DECL_NAME (decl
));
5148 DECL_CONTEXT (decl
) = DECL_CONTEXT (field
);
5150 /* Static data member are tricky; an in-class initialization
5151 still doesn't provide a definition, so the in-class
5152 declaration will have DECL_EXTERNAL set, but will have an
5153 initialization. Thus, duplicate_decls won't warn
5154 about this situation, and so we check here. */
5155 if (initialized
&& DECL_INITIALIZED_IN_CLASS_P (field
))
5156 error ("duplicate initialization of %qD", decl
);
5157 field
= duplicate_decls (decl
, field
,
5158 /*newdecl_is_friend=*/false);
5159 if (field
== error_mark_node
)
5160 return error_mark_node
;
5167 tree field
= check_classfn (context
, decl
,
5169 ? current_template_parms
5171 if (field
&& field
!= error_mark_node
5172 && duplicate_decls (decl
, field
,
5173 /*newdecl_is_friend=*/false))
5177 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
5178 DECL_IN_AGGR_P (decl
) = 0;
5179 /* Do not mark DECL as an explicit specialization if it was not
5180 already marked as an instantiation; a declaration should
5181 never be marked as a specialization unless we know what
5182 template is being specialized. */
5183 if (DECL_LANG_SPECIFIC (decl
) && DECL_USE_TEMPLATE (decl
))
5185 SET_DECL_TEMPLATE_SPECIALIZATION (decl
);
5186 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5187 DECL_COMDAT (decl
) = (TREE_PUBLIC (decl
)
5188 && DECL_DECLARED_INLINE_P (decl
));
5190 DECL_COMDAT (decl
) = false;
5192 /* [temp.expl.spec] An explicit specialization of a static data
5193 member of a template is a definition if the declaration
5194 includes an initializer; otherwise, it is a declaration.
5196 We check for processing_specialization so this only applies
5197 to the new specialization syntax. */
5198 if (!initialized
&& processing_specialization
)
5199 DECL_EXTERNAL (decl
) = 1;
5202 if (DECL_EXTERNAL (decl
) && ! DECL_TEMPLATE_SPECIALIZATION (decl
)
5203 /* Aliases are definitions. */
5205 permerror (input_location
, "declaration of %q#D outside of class is not definition",
5209 was_public
= TREE_PUBLIC (decl
);
5211 /* Enter this declaration into the symbol table. Don't push the plain
5212 VAR_DECL for a variable template. */
5213 if (!template_parm_scope_p ()
5215 decl
= maybe_push_decl (decl
);
5217 if (processing_template_decl
)
5218 decl
= push_template_decl (decl
);
5219 if (decl
== error_mark_node
)
5220 return error_mark_node
;
5223 && DECL_NAMESPACE_SCOPE_P (decl
) && !TREE_PUBLIC (decl
) && !was_public
5224 && !DECL_THIS_STATIC (decl
) && !DECL_ARTIFICIAL (decl
))
5226 /* This is a const variable with implicit 'static'. Set
5227 DECL_THIS_STATIC so we can tell it from variables that are
5228 !TREE_PUBLIC because of the anonymous namespace. */
5229 gcc_assert (CP_TYPE_CONST_P (TREE_TYPE (decl
)) || errorcount
);
5230 DECL_THIS_STATIC (decl
) = 1;
5233 if (current_function_decl
&& VAR_P (decl
)
5234 && DECL_DECLARED_CONSTEXPR_P (current_function_decl
))
5237 if (CP_DECL_THREAD_LOCAL_P (decl
))
5238 error_at (DECL_SOURCE_LOCATION (decl
),
5239 "%qD declared %<thread_local%> in %<constexpr%> function",
5241 else if (TREE_STATIC (decl
))
5242 error_at (DECL_SOURCE_LOCATION (decl
),
5243 "%qD declared %<static%> in %<constexpr%> function", decl
);
5247 cp_function_chain
->invalid_constexpr
= true;
5250 if (!processing_template_decl
&& VAR_P (decl
))
5251 start_decl_1 (decl
, initialized
);
5256 /* Process the declaration of a variable DECL. INITIALIZED is true
5257 iff DECL is explicitly initialized. (INITIALIZED is false if the
5258 variable is initialized via an implicitly-called constructor.)
5259 This function must be called for ordinary variables (including, for
5260 example, implicit instantiations of templates), but must not be
5261 called for template declarations. */
5264 start_decl_1 (tree decl
, bool initialized
)
5268 bool aggregate_definition_p
;
5270 gcc_assert (!processing_template_decl
);
5272 if (error_operand_p (decl
))
5275 gcc_assert (VAR_P (decl
));
5277 type
= TREE_TYPE (decl
);
5278 complete_p
= COMPLETE_TYPE_P (type
);
5279 aggregate_definition_p
= MAYBE_CLASS_TYPE_P (type
) && !DECL_EXTERNAL (decl
);
5281 /* If an explicit initializer is present, or if this is a definition
5282 of an aggregate, then we need a complete type at this point.
5283 (Scalars are always complete types, so there is nothing to
5284 check.) This code just sets COMPLETE_P; errors (if necessary)
5285 are issued below. */
5286 if ((initialized
|| aggregate_definition_p
)
5288 && COMPLETE_TYPE_P (complete_type (type
)))
5291 /* We will not yet have set TREE_READONLY on DECL if the type
5292 was "const", but incomplete, before this point. But, now, we
5293 have a complete type, so we can try again. */
5294 cp_apply_type_quals_to_decl (cp_type_quals (type
), decl
);
5298 /* Is it valid for this decl to have an initializer at all? */
5300 /* Don't allow initializations for incomplete types except for
5301 arrays which might be completed by the initialization. */
5303 ; /* A complete type is ok. */
5304 else if (type_uses_auto (type
))
5305 ; /* An auto type is ok. */
5306 else if (TREE_CODE (type
) != ARRAY_TYPE
)
5308 error ("variable %q#D has initializer but incomplete type", decl
);
5309 type
= TREE_TYPE (decl
) = error_mark_node
;
5311 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type
))))
5313 if (DECL_LANG_SPECIFIC (decl
) && DECL_TEMPLATE_INFO (decl
))
5314 error ("elements of array %q#D have incomplete type", decl
);
5315 /* else we already gave an error in start_decl. */
5318 else if (aggregate_definition_p
&& !complete_p
)
5320 if (type_uses_auto (type
))
5321 gcc_assert (CLASS_PLACEHOLDER_TEMPLATE (type
));
5324 error ("aggregate %q#D has incomplete type and cannot be defined",
5326 /* Change the type so that assemble_variable will give
5327 DECL an rtl we can live with: (mem (const_int 0)). */
5328 type
= TREE_TYPE (decl
) = error_mark_node
;
5332 /* Create a new scope to hold this declaration if necessary.
5333 Whether or not a new scope is necessary cannot be determined
5334 until after the type has been completed; if the type is a
5335 specialization of a class template it is not until after
5336 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
5337 will be set correctly. */
5338 maybe_push_cleanup_level (type
);
5341 /* Handle initialization of references. DECL, TYPE, and INIT have the
5342 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
5343 but will be set to a new CLEANUP_STMT if a temporary is created
5344 that must be destroyed subsequently.
5346 Returns an initializer expression to use to initialize DECL, or
5347 NULL if the initialization can be performed statically.
5349 Quotes on semantics can be found in ARM 8.4.3. */
5352 grok_reference_init (tree decl
, tree type
, tree init
, int flags
)
5354 if (init
== NULL_TREE
)
5356 if ((DECL_LANG_SPECIFIC (decl
) == 0
5357 || DECL_IN_AGGR_P (decl
) == 0)
5358 && ! DECL_THIS_EXTERN (decl
))
5359 error ("%qD declared as reference but not initialized", decl
);
5363 if (TREE_CODE (init
) == TREE_LIST
)
5364 init
= build_x_compound_expr_from_list (init
, ELK_INIT
,
5365 tf_warning_or_error
);
5367 tree ttype
= TREE_TYPE (type
);
5368 if (TREE_CODE (ttype
) != ARRAY_TYPE
5369 && TREE_CODE (TREE_TYPE (init
)) == ARRAY_TYPE
)
5370 /* Note: default conversion is only called in very special cases. */
5371 init
= decay_conversion (init
, tf_warning_or_error
);
5373 /* check_initializer handles this for non-reference variables, but for
5374 references we need to do it here or the initializer will get the
5375 incomplete array type and confuse later calls to
5376 cp_complete_array_type. */
5377 if (TREE_CODE (ttype
) == ARRAY_TYPE
5378 && TYPE_DOMAIN (ttype
) == NULL_TREE
5379 && (BRACE_ENCLOSED_INITIALIZER_P (init
)
5380 || TREE_CODE (init
) == STRING_CST
))
5382 cp_complete_array_type (&ttype
, init
, false);
5383 if (ttype
!= TREE_TYPE (type
))
5384 type
= cp_build_reference_type (ttype
, TYPE_REF_IS_RVALUE (type
));
5387 /* Convert INIT to the reference type TYPE. This may involve the
5388 creation of a temporary, whose lifetime must be the same as that
5389 of the reference. If so, a DECL_EXPR for the temporary will be
5390 added just after the DECL_EXPR for DECL. That's why we don't set
5391 DECL_INITIAL for local references (instead assigning to them
5392 explicitly); we need to allow the temporary to be initialized
5394 return initialize_reference (type
, init
, flags
,
5395 tf_warning_or_error
);
5398 /* Designated initializers in arrays are not supported in GNU C++.
5399 The parser cannot detect this error since it does not know whether
5400 a given brace-enclosed initializer is for a class type or for an
5401 array. This function checks that CE does not use a designated
5402 initializer. If it does, an error is issued. Returns true if CE
5403 is valid, i.e., does not have a designated initializer. */
5406 check_array_designated_initializer (constructor_elt
*ce
,
5407 unsigned HOST_WIDE_INT index
)
5409 /* Designated initializers for array elements are not supported. */
5412 /* The parser only allows identifiers as designated
5414 if (ce
->index
== error_mark_node
)
5416 error ("name used in a GNU-style designated "
5417 "initializer for an array");
5420 else if (identifier_p (ce
->index
))
5422 error ("name %qD used in a GNU-style designated "
5423 "initializer for an array", ce
->index
);
5427 tree ce_index
= build_expr_type_conversion (WANT_INT
| WANT_ENUM
,
5430 && INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (ce_index
))
5431 && (TREE_CODE (ce_index
= fold_non_dependent_expr (ce_index
))
5434 /* A C99 designator is OK if it matches the current index. */
5435 if (wi::to_wide (ce_index
) == index
)
5437 ce
->index
= ce_index
;
5441 sorry ("non-trivial designated initializers not supported");
5444 error ("C99 designator %qE is not an integral constant-expression",
5453 /* When parsing `int a[] = {1, 2};' we don't know the size of the
5454 array until we finish parsing the initializer. If that's the
5455 situation we're in, update DECL accordingly. */
5458 maybe_deduce_size_from_array_init (tree decl
, tree init
)
5460 tree type
= TREE_TYPE (decl
);
5462 if (TREE_CODE (type
) == ARRAY_TYPE
5463 && TYPE_DOMAIN (type
) == NULL_TREE
5464 && TREE_CODE (decl
) != TYPE_DECL
)
5466 /* do_default is really a C-ism to deal with tentative definitions.
5467 But let's leave it here to ease the eventual merge. */
5468 int do_default
= !DECL_EXTERNAL (decl
);
5469 tree initializer
= init
? init
: DECL_INITIAL (decl
);
5472 /* Check that there are no designated initializers in INIT, as
5473 those are not supported in GNU C++, and as the middle-end
5474 will crash if presented with a non-numeric designated
5476 if (initializer
&& BRACE_ENCLOSED_INITIALIZER_P (initializer
))
5478 vec
<constructor_elt
, va_gc
> *v
= CONSTRUCTOR_ELTS (initializer
);
5479 constructor_elt
*ce
;
5481 FOR_EACH_VEC_SAFE_ELT (v
, i
, ce
)
5483 if (instantiation_dependent_expression_p (ce
->index
))
5485 if (!check_array_designated_initializer (ce
, i
))
5491 TREE_TYPE (decl
) = error_mark_node
;
5494 failure
= cp_complete_array_type (&TREE_TYPE (decl
), initializer
,
5498 error_at (cp_expr_loc_or_loc (initializer
,
5499 DECL_SOURCE_LOCATION (decl
)),
5500 "initializer fails to determine size of %qD", decl
);
5502 else if (failure
== 2)
5506 error_at (DECL_SOURCE_LOCATION (decl
),
5507 "array size missing in %qD", decl
);
5509 /* If a `static' var's size isn't known, make it extern as
5510 well as static, so it does not get allocated. If it's not
5511 `static', then don't mark it extern; finish_incomplete_decl
5512 will give it a default size and it will get allocated. */
5513 else if (!pedantic
&& TREE_STATIC (decl
) && !TREE_PUBLIC (decl
))
5514 DECL_EXTERNAL (decl
) = 1;
5516 else if (failure
== 3)
5518 error_at (DECL_SOURCE_LOCATION (decl
),
5519 "zero-size array %qD", decl
);
5523 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl
)), decl
);
5525 relayout_decl (decl
);
5529 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
5530 any appropriate error messages regarding the layout. */
5533 layout_var_decl (tree decl
)
5537 type
= TREE_TYPE (decl
);
5538 if (type
== error_mark_node
)
5541 /* If we haven't already laid out this declaration, do so now.
5542 Note that we must not call complete type for an external object
5543 because it's type might involve templates that we are not
5544 supposed to instantiate yet. (And it's perfectly valid to say
5545 `extern X x' for some incomplete type `X'.) */
5546 if (!DECL_EXTERNAL (decl
))
5547 complete_type (type
);
5548 if (!DECL_SIZE (decl
)
5549 && TREE_TYPE (decl
) != error_mark_node
5550 && complete_or_array_type_p (type
))
5551 layout_decl (decl
, 0);
5553 if (!DECL_EXTERNAL (decl
) && DECL_SIZE (decl
) == NULL_TREE
)
5555 /* An automatic variable with an incomplete type: that is an error.
5556 Don't talk about array types here, since we took care of that
5557 message in grokdeclarator. */
5558 error_at (DECL_SOURCE_LOCATION (decl
),
5559 "storage size of %qD isn%'t known", decl
);
5560 TREE_TYPE (decl
) = error_mark_node
;
5563 /* Keep this code around in case we later want to control debug info
5564 based on whether a type is "used". (jason 1999-11-11) */
5566 else if (!DECL_EXTERNAL (decl
) && MAYBE_CLASS_TYPE_P (ttype
))
5567 /* Let debugger know it should output info for this type. */
5568 note_debug_info_needed (ttype
);
5570 if (TREE_STATIC (decl
) && DECL_CLASS_SCOPE_P (decl
))
5571 note_debug_info_needed (DECL_CONTEXT (decl
));
5574 if ((DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
5575 && DECL_SIZE (decl
) != NULL_TREE
5576 && ! TREE_CONSTANT (DECL_SIZE (decl
)))
5578 if (TREE_CODE (DECL_SIZE (decl
)) == INTEGER_CST
)
5579 constant_expression_warning (DECL_SIZE (decl
));
5582 error_at (DECL_SOURCE_LOCATION (decl
),
5583 "storage size of %qD isn%'t constant", decl
);
5584 TREE_TYPE (decl
) = error_mark_node
;
5589 /* If a local static variable is declared in an inline function, or if
5590 we have a weak definition, we must endeavor to create only one
5591 instance of the variable at link-time. */
5594 maybe_commonize_var (tree decl
)
5596 /* Don't mess with __FUNCTION__ and similar. */
5597 if (DECL_ARTIFICIAL (decl
))
5600 /* Static data in a function with comdat linkage also has comdat
5602 if ((TREE_STATIC (decl
)
5603 && DECL_FUNCTION_SCOPE_P (decl
)
5604 && vague_linkage_p (DECL_CONTEXT (decl
)))
5605 || (TREE_PUBLIC (decl
) && DECL_INLINE_VAR_P (decl
)))
5609 /* With weak symbols, we simply make the variable COMDAT;
5610 that will cause copies in multiple translations units to
5612 comdat_linkage (decl
);
5616 if (DECL_INITIAL (decl
) == NULL_TREE
5617 || DECL_INITIAL (decl
) == error_mark_node
)
5619 /* Without weak symbols, we can use COMMON to merge
5620 uninitialized variables. */
5621 TREE_PUBLIC (decl
) = 1;
5622 DECL_COMMON (decl
) = 1;
5626 /* While for initialized variables, we must use internal
5627 linkage -- which means that multiple copies will not
5629 TREE_PUBLIC (decl
) = 0;
5630 DECL_COMMON (decl
) = 0;
5632 if (DECL_INLINE_VAR_P (decl
))
5633 msg
= G_("sorry: semantics of inline variable "
5634 "%q#D are wrong (you%'ll wind up with "
5635 "multiple copies)");
5637 msg
= G_("sorry: semantics of inline function "
5638 "static data %q#D are wrong (you%'ll wind "
5639 "up with multiple copies)");
5640 if (warning_at (DECL_SOURCE_LOCATION (decl
), 0,
5642 inform (DECL_SOURCE_LOCATION (decl
),
5643 "you can work around this by removing the initializer");
5649 /* Issue an error message if DECL is an uninitialized const variable.
5650 CONSTEXPR_CONTEXT_P is true when the function is called in a constexpr
5651 context from potential_constant_expression. Returns true if all is well,
5655 check_for_uninitialized_const_var (tree decl
, bool constexpr_context_p
,
5656 tsubst_flags_t complain
)
5658 tree type
= strip_array_types (TREE_TYPE (decl
));
5660 /* ``Unless explicitly declared extern, a const object does not have
5661 external linkage and must be initialized. ($8.4; $12.1)'' ARM
5664 && !TYPE_REF_P (type
)
5665 && (constexpr_context_p
5666 || CP_TYPE_CONST_P (type
) || var_in_constexpr_fn (decl
))
5667 && !DECL_NONTRIVIALLY_INITIALIZED_P (decl
))
5669 tree field
= default_init_uninitialized_part (type
);
5673 if (!constexpr_context_p
)
5675 if (CP_TYPE_CONST_P (type
))
5677 if (complain
& tf_error
)
5678 permerror (DECL_SOURCE_LOCATION (decl
),
5679 "uninitialized const %qD", decl
);
5683 if (!is_instantiation_of_constexpr (current_function_decl
)
5684 && (complain
& tf_error
))
5685 error_at (DECL_SOURCE_LOCATION (decl
),
5686 "uninitialized variable %qD in %<constexpr%> "
5688 cp_function_chain
->invalid_constexpr
= true;
5691 else if (complain
& tf_error
)
5692 error_at (DECL_SOURCE_LOCATION (decl
),
5693 "uninitialized variable %qD in %<constexpr%> context",
5696 if (CLASS_TYPE_P (type
) && (complain
& tf_error
))
5698 tree defaulted_ctor
;
5700 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (type
)),
5701 "%q#T has no user-provided default constructor", type
);
5702 defaulted_ctor
= in_class_defaulted_default_constructor (type
);
5704 inform (DECL_SOURCE_LOCATION (defaulted_ctor
),
5705 "constructor is not user-provided because it is "
5706 "explicitly defaulted in the class body");
5707 inform (DECL_SOURCE_LOCATION (field
),
5708 "and the implicitly-defined constructor does not "
5709 "initialize %q#D", field
);
5718 /* Structure holding the current initializer being processed by reshape_init.
5719 CUR is a pointer to the current element being processed, END is a pointer
5720 after the last element present in the initializer. */
5723 constructor_elt
*cur
;
5724 constructor_elt
*end
;
5727 static tree
reshape_init_r (tree
, reshape_iter
*, bool, tsubst_flags_t
);
5729 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
5730 returned is the next FIELD_DECL (possibly FIELD itself) that can be
5731 initialized. If there are no more such fields, the return value
5735 next_initializable_field (tree field
)
5738 && (TREE_CODE (field
) != FIELD_DECL
5739 || DECL_UNNAMED_BIT_FIELD (field
)
5740 || (DECL_ARTIFICIAL (field
)
5741 && !(cxx_dialect
>= cxx17
&& DECL_FIELD_IS_BASE (field
)))))
5742 field
= DECL_CHAIN (field
);
5747 /* Return true for [dcl.init.list] direct-list-initialization from
5748 single element of enumeration with a fixed underlying type. */
5751 is_direct_enum_init (tree type
, tree init
)
5753 if (cxx_dialect
>= cxx17
5754 && TREE_CODE (type
) == ENUMERAL_TYPE
5755 && ENUM_FIXED_UNDERLYING_TYPE_P (type
)
5756 && TREE_CODE (init
) == CONSTRUCTOR
5757 && CONSTRUCTOR_IS_DIRECT_INIT (init
)
5758 && CONSTRUCTOR_NELTS (init
) == 1)
5763 /* Subroutine of reshape_init_array and reshape_init_vector, which does
5764 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
5765 INTEGER_CST representing the size of the array minus one (the maximum index),
5766 or NULL_TREE if the array was declared without specifying the size. D is
5767 the iterator within the constructor. */
5770 reshape_init_array_1 (tree elt_type
, tree max_index
, reshape_iter
*d
,
5771 tsubst_flags_t complain
)
5774 bool sized_array_p
= (max_index
&& TREE_CONSTANT (max_index
));
5775 unsigned HOST_WIDE_INT max_index_cst
= 0;
5776 unsigned HOST_WIDE_INT index
;
5778 /* The initializer for an array is always a CONSTRUCTOR. */
5779 new_init
= build_constructor (init_list_type_node
, NULL
);
5783 /* Minus 1 is used for zero sized arrays. */
5784 if (integer_all_onesp (max_index
))
5787 if (tree_fits_uhwi_p (max_index
))
5788 max_index_cst
= tree_to_uhwi (max_index
);
5789 /* sizetype is sign extended, not zero extended. */
5791 max_index_cst
= tree_to_uhwi (fold_convert (size_type_node
, max_index
));
5794 /* Loop until there are no more initializers. */
5796 d
->cur
!= d
->end
&& (!sized_array_p
|| index
<= max_index_cst
);
5800 constructor_elt
*old_cur
= d
->cur
;
5802 check_array_designated_initializer (d
->cur
, index
);
5803 elt_init
= reshape_init_r (elt_type
, d
, /*first_initializer_p=*/false,
5805 if (elt_init
== error_mark_node
)
5806 return error_mark_node
;
5807 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init
),
5808 size_int (index
), elt_init
);
5809 if (!TREE_CONSTANT (elt_init
))
5810 TREE_CONSTANT (new_init
) = false;
5812 /* This can happen with an invalid initializer (c++/54501). */
5813 if (d
->cur
== old_cur
&& !sized_array_p
)
5820 /* Subroutine of reshape_init_r, processes the initializers for arrays.
5821 Parameters are the same of reshape_init_r. */
5824 reshape_init_array (tree type
, reshape_iter
*d
, tsubst_flags_t complain
)
5826 tree max_index
= NULL_TREE
;
5828 gcc_assert (TREE_CODE (type
) == ARRAY_TYPE
);
5830 if (TYPE_DOMAIN (type
))
5831 max_index
= array_type_nelts (type
);
5833 return reshape_init_array_1 (TREE_TYPE (type
), max_index
, d
, complain
);
5836 /* Subroutine of reshape_init_r, processes the initializers for vectors.
5837 Parameters are the same of reshape_init_r. */
5840 reshape_init_vector (tree type
, reshape_iter
*d
, tsubst_flags_t complain
)
5842 tree max_index
= NULL_TREE
;
5844 gcc_assert (VECTOR_TYPE_P (type
));
5846 if (COMPOUND_LITERAL_P (d
->cur
->value
))
5848 tree value
= d
->cur
->value
;
5849 if (!same_type_p (TREE_TYPE (value
), type
))
5851 if (complain
& tf_error
)
5852 error ("invalid type %qT as initializer for a vector of type %qT",
5853 TREE_TYPE (d
->cur
->value
), type
);
5854 value
= error_mark_node
;
5860 /* For a vector, we initialize it as an array of the appropriate size. */
5861 if (VECTOR_TYPE_P (type
))
5862 max_index
= size_int (TYPE_VECTOR_SUBPARTS (type
) - 1);
5864 return reshape_init_array_1 (TREE_TYPE (type
), max_index
, d
, complain
);
5867 /* Subroutine of reshape_init_r, processes the initializers for classes
5868 or union. Parameters are the same of reshape_init_r. */
5871 reshape_init_class (tree type
, reshape_iter
*d
, bool first_initializer_p
,
5872 tsubst_flags_t complain
)
5877 gcc_assert (CLASS_TYPE_P (type
));
5879 /* The initializer for a class is always a CONSTRUCTOR. */
5880 new_init
= build_constructor (init_list_type_node
, NULL
);
5881 field
= next_initializable_field (TYPE_FIELDS (type
));
5887 An initializer for an aggregate member that is an
5888 empty class shall have the form of an empty
5889 initializer-list {}. */
5890 if (!first_initializer_p
)
5892 if (complain
& tf_error
)
5893 error ("initializer for %qT must be brace-enclosed", type
);
5894 return error_mark_node
;
5899 /* Loop through the initializable fields, gathering initializers. */
5900 while (d
->cur
!= d
->end
)
5903 constructor_elt
*old_cur
= d
->cur
;
5905 /* Handle designated initializers, as an extension. */
5908 if (d
->cur
->index
== error_mark_node
)
5909 return error_mark_node
;
5911 if (TREE_CODE (d
->cur
->index
) == FIELD_DECL
)
5913 /* We already reshaped this. */
5914 if (field
!= d
->cur
->index
)
5916 tree id
= DECL_NAME (d
->cur
->index
);
5918 gcc_checking_assert (d
->cur
->index
5919 == get_class_binding (type
, id
, false));
5920 field
= d
->cur
->index
;
5923 else if (TREE_CODE (d
->cur
->index
) == IDENTIFIER_NODE
)
5924 field
= get_class_binding (type
, d
->cur
->index
, false);
5927 if (complain
& tf_error
)
5928 error ("%<[%E] =%> used in a GNU-style designated initializer"
5929 " for class %qT", d
->cur
->index
, type
);
5930 return error_mark_node
;
5933 if (!field
|| TREE_CODE (field
) != FIELD_DECL
)
5935 if (complain
& tf_error
)
5936 error ("%qT has no non-static data member named %qD", type
,
5938 return error_mark_node
;
5942 /* If we processed all the member of the class, we are done. */
5946 field_init
= reshape_init_r (TREE_TYPE (field
), d
,
5947 /*first_initializer_p=*/false, complain
);
5948 if (field_init
== error_mark_node
)
5949 return error_mark_node
;
5951 if (d
->cur
== old_cur
&& d
->cur
->index
)
5953 /* This can happen with an invalid initializer for a flexible
5954 array member (c++/54441). */
5955 if (complain
& tf_error
)
5956 error ("invalid initializer for %q#D", field
);
5957 return error_mark_node
;
5960 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init
), field
, field_init
);
5964 When a union is initialized with a brace-enclosed
5965 initializer, the braces shall only contain an
5966 initializer for the first member of the union. */
5967 if (TREE_CODE (type
) == UNION_TYPE
)
5970 field
= next_initializable_field (DECL_CHAIN (field
));
5976 /* Subroutine of reshape_init_r. We're in a context where C99 initializer
5977 designators are not valid; either complain or return true to indicate
5978 that reshape_init_r should return error_mark_node. */
5981 has_designator_problem (reshape_iter
*d
, tsubst_flags_t complain
)
5985 if (complain
& tf_error
)
5986 error ("C99 designator %qE outside aggregate initializer",
5994 /* Subroutine of reshape_init, which processes a single initializer (part of
5995 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
5996 iterator within the CONSTRUCTOR which points to the initializer to process.
5997 FIRST_INITIALIZER_P is true if this is the first initializer of the
5998 outermost CONSTRUCTOR node. */
6001 reshape_init_r (tree type
, reshape_iter
*d
, bool first_initializer_p
,
6002 tsubst_flags_t complain
)
6004 tree init
= d
->cur
->value
;
6006 if (error_operand_p (init
))
6007 return error_mark_node
;
6009 if (first_initializer_p
&& !CP_AGGREGATE_TYPE_P (type
)
6010 && has_designator_problem (d
, complain
))
6011 return error_mark_node
;
6013 tree stripped_init
= tree_strip_any_location_wrapper (init
);
6015 if (TREE_CODE (type
) == COMPLEX_TYPE
)
6017 /* A complex type can be initialized from one or two initializers,
6018 but braces are not elided. */
6020 if (BRACE_ENCLOSED_INITIALIZER_P (stripped_init
))
6022 if (CONSTRUCTOR_NELTS (stripped_init
) > 2)
6024 if (complain
& tf_error
)
6025 error ("too many initializers for %qT", type
);
6027 return error_mark_node
;
6030 else if (first_initializer_p
&& d
->cur
!= d
->end
)
6032 vec
<constructor_elt
, va_gc
> *v
= 0;
6033 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, init
);
6034 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, d
->cur
->value
);
6035 if (has_designator_problem (d
, complain
))
6036 return error_mark_node
;
6038 init
= build_constructor (init_list_type_node
, v
);
6043 /* A non-aggregate type is always initialized with a single
6045 if (!CP_AGGREGATE_TYPE_P (type
))
6047 /* It is invalid to initialize a non-aggregate type with a
6048 brace-enclosed initializer before C++0x.
6049 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
6050 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
6051 a CONSTRUCTOR (with a record type). */
6052 if (TREE_CODE (stripped_init
) == CONSTRUCTOR
6053 /* Don't complain about a capture-init. */
6054 && !CONSTRUCTOR_IS_DIRECT_INIT (stripped_init
)
6055 && BRACE_ENCLOSED_INITIALIZER_P (stripped_init
)) /* p7626.C */
6057 if (SCALAR_TYPE_P (type
))
6059 if (cxx_dialect
< cxx11
6060 /* Isn't value-initialization. */
6061 || CONSTRUCTOR_NELTS (stripped_init
) > 0)
6063 if (complain
& tf_error
)
6064 error ("braces around scalar initializer for type %qT",
6066 init
= error_mark_node
;
6070 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS
);
6077 /* "If T is a class type and the initializer list has a single element of
6078 type cv U, where U is T or a class derived from T, the object is
6079 initialized from that element." Even if T is an aggregate. */
6080 if (cxx_dialect
>= cxx11
&& (CLASS_TYPE_P (type
) || VECTOR_TYPE_P (type
))
6081 && first_initializer_p
6082 && d
->end
- d
->cur
== 1
6083 && reference_related_p (type
, TREE_TYPE (init
)))
6091 All implicit type conversions (clause _conv_) are considered when
6092 initializing the aggregate member with an initializer from an
6093 initializer-list. If the initializer can initialize a member,
6094 the member is initialized. Otherwise, if the member is itself a
6095 non-empty subaggregate, brace elision is assumed and the
6096 initializer is considered for the initialization of the first
6097 member of the subaggregate. */
6098 if (TREE_CODE (init
) != CONSTRUCTOR
6099 /* But don't try this for the first initializer, since that would be
6100 looking through the outermost braces; A a2 = { a1 }; is not a
6101 valid aggregate initialization. */
6102 && !first_initializer_p
6103 && (same_type_ignoring_top_level_qualifiers_p (type
, TREE_TYPE (init
))
6104 || can_convert_arg (type
, TREE_TYPE (init
), init
, LOOKUP_NORMAL
,
6111 /* [dcl.init.string]
6113 A char array (whether plain char, signed char, or unsigned char)
6114 can be initialized by a string-literal (optionally enclosed in
6115 braces); a wchar_t array can be initialized by a wide
6116 string-literal (optionally enclosed in braces). */
6117 if (TREE_CODE (type
) == ARRAY_TYPE
6118 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type
))))
6120 tree str_init
= init
;
6121 tree stripped_str_init
= stripped_init
;
6123 /* Strip one level of braces if and only if they enclose a single
6124 element (as allowed by [dcl.init.string]). */
6125 if (!first_initializer_p
6126 && TREE_CODE (stripped_str_init
) == CONSTRUCTOR
6127 && CONSTRUCTOR_NELTS (stripped_str_init
) == 1)
6129 str_init
= (*CONSTRUCTOR_ELTS (stripped_str_init
))[0].value
;
6130 stripped_str_init
= tree_strip_any_location_wrapper (str_init
);
6133 /* If it's a string literal, then it's the initializer for the array
6134 as a whole. Otherwise, continue with normal initialization for
6135 array types (one value per array element). */
6136 if (TREE_CODE (stripped_str_init
) == STRING_CST
)
6138 if (has_designator_problem (d
, complain
))
6139 return error_mark_node
;
6145 /* The following cases are about aggregates. If we are not within a full
6146 initializer already, and there is not a CONSTRUCTOR, it means that there
6147 is a missing set of braces (that is, we are processing the case for
6148 which reshape_init exists). */
6149 if (!first_initializer_p
)
6151 if (TREE_CODE (stripped_init
) == CONSTRUCTOR
)
6153 if (TREE_TYPE (init
) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init
)))
6154 /* There is no need to reshape pointer-to-member function
6155 initializers, as they are always constructed correctly
6156 by the front end. */
6158 else if (COMPOUND_LITERAL_P (stripped_init
))
6159 /* For a nested compound literal, there is no need to reshape since
6160 brace elision is not allowed. Even if we decided to allow it,
6161 we should add a call to reshape_init in finish_compound_literal,
6162 before calling digest_init, so changing this code would still
6163 not be necessary. */
6164 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (stripped_init
));
6168 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (stripped_init
));
6169 return reshape_init (type
, init
, complain
);
6173 if (complain
& tf_warning
)
6174 warning (OPT_Wmissing_braces
,
6175 "missing braces around initializer for %qT",
6179 /* Dispatch to specialized routines. */
6180 if (CLASS_TYPE_P (type
))
6181 return reshape_init_class (type
, d
, first_initializer_p
, complain
);
6182 else if (TREE_CODE (type
) == ARRAY_TYPE
)
6183 return reshape_init_array (type
, d
, complain
);
6184 else if (VECTOR_TYPE_P (type
))
6185 return reshape_init_vector (type
, d
, complain
);
6190 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
6191 brace-enclosed aggregate initializer.
6193 INIT is the CONSTRUCTOR containing the list of initializers describing
6194 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
6195 It may not presently match the shape of the TYPE; for example:
6197 struct S { int a; int b; };
6198 struct S a[] = { 1, 2, 3, 4 };
6200 Here INIT will hold a vector of four elements, rather than a
6201 vector of two elements, each itself a vector of two elements. This
6202 routine transforms INIT from the former form into the latter. The
6203 revised CONSTRUCTOR node is returned. */
6206 reshape_init (tree type
, tree init
, tsubst_flags_t complain
)
6208 vec
<constructor_elt
, va_gc
> *v
;
6212 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init
));
6214 v
= CONSTRUCTOR_ELTS (init
);
6216 /* An empty constructor does not need reshaping, and it is always a valid
6218 if (vec_safe_is_empty (v
))
6221 /* Handle [dcl.init.list] direct-list-initialization from
6222 single element of enumeration with a fixed underlying type. */
6223 if (is_direct_enum_init (type
, init
))
6225 tree elt
= CONSTRUCTOR_ELT (init
, 0)->value
;
6226 type
= cv_unqualified (type
);
6227 if (check_narrowing (ENUM_UNDERLYING_TYPE (type
), elt
, complain
))
6229 warning_sentinel
w (warn_useless_cast
);
6230 warning_sentinel
w2 (warn_ignored_qualifiers
);
6231 return cp_build_c_cast (type
, elt
, tf_warning_or_error
);
6234 return error_mark_node
;
6237 /* Recurse on this CONSTRUCTOR. */
6239 d
.end
= d
.cur
+ v
->length ();
6241 new_init
= reshape_init_r (type
, &d
, true, complain
);
6242 if (new_init
== error_mark_node
)
6243 return error_mark_node
;
6245 /* Make sure all the element of the constructor were used. Otherwise,
6246 issue an error about exceeding initializers. */
6249 if (complain
& tf_error
)
6250 error ("too many initializers for %qT", type
);
6251 return error_mark_node
;
6254 if (CONSTRUCTOR_IS_DIRECT_INIT (init
)
6255 && BRACE_ENCLOSED_INITIALIZER_P (new_init
))
6256 CONSTRUCTOR_IS_DIRECT_INIT (new_init
) = true;
6261 /* Verify array initializer. Returns true if errors have been reported. */
6264 check_array_initializer (tree decl
, tree type
, tree init
)
6266 tree element_type
= TREE_TYPE (type
);
6268 /* The array type itself need not be complete, because the
6269 initializer may tell us how many elements are in the array.
6270 But, the elements of the array must be complete. */
6271 if (!COMPLETE_TYPE_P (complete_type (element_type
)))
6274 error_at (DECL_SOURCE_LOCATION (decl
),
6275 "elements of array %q#D have incomplete type", decl
);
6277 error ("elements of array %q#T have incomplete type", type
);
6280 /* A compound literal can't have variable size. */
6282 && ((COMPLETE_TYPE_P (type
) && !TREE_CONSTANT (TYPE_SIZE (type
)))
6283 || !TREE_CONSTANT (TYPE_SIZE (element_type
))))
6285 error ("variable-sized compound literal");
6291 /* Subroutine of check_initializer; args are passed down from that function.
6292 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
6295 build_aggr_init_full_exprs (tree decl
, tree init
, int flags
)
6298 gcc_assert (stmts_are_full_exprs_p ());
6299 return build_aggr_init (decl
, init
, flags
, tf_warning_or_error
);
6302 /* Verify INIT (the initializer for DECL), and record the
6303 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
6304 grok_reference_init.
6306 If the return value is non-NULL, it is an expression that must be
6307 evaluated dynamically to initialize DECL. */
6310 check_initializer (tree decl
, tree init
, int flags
, vec
<tree
, va_gc
> **cleanups
)
6312 tree type
= TREE_TYPE (decl
);
6313 tree init_code
= NULL
;
6316 /* Things that are going to be initialized need to have complete
6318 TREE_TYPE (decl
) = type
= complete_type (TREE_TYPE (decl
));
6320 if (DECL_HAS_VALUE_EXPR_P (decl
))
6322 /* A variable with DECL_HAS_VALUE_EXPR_P set is just a placeholder,
6323 it doesn't have storage to be initialized. */
6324 gcc_assert (init
== NULL_TREE
);
6328 if (type
== error_mark_node
)
6329 /* We will have already complained. */
6332 if (TREE_CODE (type
) == ARRAY_TYPE
)
6334 if (check_array_initializer (decl
, type
, init
))
6337 else if (!COMPLETE_TYPE_P (type
))
6339 error_at (DECL_SOURCE_LOCATION (decl
),
6340 "%q#D has incomplete type", decl
);
6341 TREE_TYPE (decl
) = error_mark_node
;
6345 /* There is no way to make a variable-sized class type in GNU C++. */
6346 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type
)));
6348 if (init
&& BRACE_ENCLOSED_INITIALIZER_P (init
))
6350 int init_len
= CONSTRUCTOR_NELTS (init
);
6351 if (SCALAR_TYPE_P (type
))
6355 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS
);
6356 init
= build_zero_init (type
, NULL_TREE
, false);
6358 else if (init_len
!= 1 && TREE_CODE (type
) != COMPLEX_TYPE
)
6360 error_at (cp_expr_loc_or_loc (init
, DECL_SOURCE_LOCATION (decl
)),
6361 "scalar object %qD requires one element in "
6362 "initializer", decl
);
6363 TREE_TYPE (decl
) = error_mark_node
;
6369 if (TREE_CODE (decl
) == CONST_DECL
)
6371 gcc_assert (!TYPE_REF_P (type
));
6373 DECL_INITIAL (decl
) = init
;
6375 gcc_assert (init
!= NULL_TREE
);
6378 else if (!init
&& DECL_REALLY_EXTERN (decl
))
6380 else if (init
|| type_build_ctor_call (type
)
6381 || TYPE_REF_P (type
))
6383 if (TYPE_REF_P (type
))
6385 init
= grok_reference_init (decl
, type
, init
, flags
);
6386 flags
|= LOOKUP_ALREADY_DIGESTED
;
6389 check_for_uninitialized_const_var (decl
, /*constexpr_context_p=*/false,
6390 tf_warning_or_error
);
6391 /* Do not reshape constructors of vectors (they don't need to be
6393 else if (BRACE_ENCLOSED_INITIALIZER_P (init
))
6395 if (is_std_init_list (type
))
6397 init
= perform_implicit_conversion (type
, init
,
6398 tf_warning_or_error
);
6399 flags
|= LOOKUP_ALREADY_DIGESTED
;
6401 else if (TYPE_NON_AGGREGATE_CLASS (type
))
6403 /* Don't reshape if the class has constructors. */
6404 if (cxx_dialect
== cxx98
)
6405 error_at (cp_expr_loc_or_loc (init
, DECL_SOURCE_LOCATION (decl
)),
6406 "in C++98 %qD must be initialized by "
6407 "constructor, not by %<{...}%>",
6410 else if (VECTOR_TYPE_P (type
) && TYPE_VECTOR_OPAQUE (type
))
6412 error ("opaque vector types cannot be initialized");
6413 init
= error_mark_node
;
6417 init
= reshape_init (type
, init
, tf_warning_or_error
);
6418 flags
|= LOOKUP_NO_NARROWING
;
6421 else if (TREE_CODE (init
) == TREE_LIST
6422 && TREE_TYPE (init
) != unknown_type_node
6423 && !MAYBE_CLASS_TYPE_P (type
))
6425 gcc_assert (TREE_CODE (decl
) != RESULT_DECL
);
6427 /* We get here with code like `int a (2);' */
6428 init
= build_x_compound_expr_from_list (init
, ELK_INIT
,
6429 tf_warning_or_error
);
6432 /* If DECL has an array type without a specific bound, deduce the
6433 array size from the initializer. */
6434 maybe_deduce_size_from_array_init (decl
, init
);
6435 type
= TREE_TYPE (decl
);
6436 if (type
== error_mark_node
)
6439 if (((type_build_ctor_call (type
) || CLASS_TYPE_P (type
))
6440 && !(flags
& LOOKUP_ALREADY_DIGESTED
)
6441 && !(init
&& BRACE_ENCLOSED_INITIALIZER_P (init
)
6442 && CP_AGGREGATE_TYPE_P (type
)
6443 && (CLASS_TYPE_P (type
)
6444 || !TYPE_NEEDS_CONSTRUCTING (type
)
6445 || type_has_extended_temps (type
))))
6446 || (DECL_DECOMPOSITION_P (decl
) && TREE_CODE (type
) == ARRAY_TYPE
))
6448 init_code
= build_aggr_init_full_exprs (decl
, init
, flags
);
6450 /* A constructor call is a non-trivial initializer even if
6451 it isn't explicitly written. */
6452 if (TREE_SIDE_EFFECTS (init_code
))
6453 DECL_NONTRIVIALLY_INITIALIZED_P (decl
) = true;
6455 /* If this is a constexpr initializer, expand_default_init will
6456 have returned an INIT_EXPR rather than a CALL_EXPR. In that
6457 case, pull the initializer back out and pass it down into
6458 store_init_value. */
6459 while (TREE_CODE (init_code
) == EXPR_STMT
6460 || TREE_CODE (init_code
) == CONVERT_EXPR
)
6461 init_code
= TREE_OPERAND (init_code
, 0);
6462 if (TREE_CODE (init_code
) == INIT_EXPR
)
6464 init
= TREE_OPERAND (init_code
, 1);
6465 init_code
= NULL_TREE
;
6466 /* Don't call digest_init; it's unnecessary and will complain
6467 about aggregate initialization of non-aggregate classes. */
6468 flags
|= LOOKUP_ALREADY_DIGESTED
;
6470 else if (DECL_DECLARED_CONSTEXPR_P (decl
))
6472 /* Declared constexpr, but no suitable initializer; massage
6473 init appropriately so we can pass it into store_init_value
6475 if (CLASS_TYPE_P (type
)
6476 && (!init
|| TREE_CODE (init
) == TREE_LIST
))
6478 init
= build_functional_cast (type
, init
, tf_none
);
6479 if (TREE_CODE (init
) == TARGET_EXPR
)
6480 TARGET_EXPR_DIRECT_INIT_P (init
) = true;
6482 init_code
= NULL_TREE
;
6488 if (init
&& TREE_CODE (init
) != TREE_VEC
)
6490 /* In aggregate initialization of a variable, each element
6491 initialization is a full-expression because there is no
6492 enclosing expression. */
6493 gcc_assert (stmts_are_full_exprs_p ());
6495 init_code
= store_init_value (decl
, init
, cleanups
, flags
);
6497 if (DECL_INITIAL (decl
)
6498 && TREE_CODE (DECL_INITIAL (decl
)) == CONSTRUCTOR
6499 && !vec_safe_is_empty (CONSTRUCTOR_ELTS (DECL_INITIAL (decl
))))
6501 tree elt
= CONSTRUCTOR_ELTS (DECL_INITIAL (decl
))->last ().value
;
6502 if (TREE_CODE (TREE_TYPE (elt
)) == ARRAY_TYPE
6503 && TYPE_SIZE (TREE_TYPE (elt
)) == NULL_TREE
)
6504 cp_complete_array_type (&TREE_TYPE (elt
), elt
, false);
6507 if (pedantic
&& TREE_CODE (type
) == ARRAY_TYPE
6508 && DECL_INITIAL (decl
)
6509 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
6510 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl
)))
6511 warning_at (cp_expr_loc_or_loc (DECL_INITIAL (decl
),
6512 DECL_SOURCE_LOCATION (decl
)),
6513 0, "array %qD initialized by parenthesized "
6514 "string literal %qE",
6515 decl
, DECL_INITIAL (decl
));
6521 if (CLASS_TYPE_P (core_type
= strip_array_types (type
))
6522 && (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type
)
6523 || CLASSTYPE_REF_FIELDS_NEED_INIT (core_type
)))
6524 diagnose_uninitialized_cst_or_ref_member (core_type
, /*using_new=*/false,
6527 check_for_uninitialized_const_var (decl
, /*constexpr_context_p=*/false,
6528 tf_warning_or_error
);
6531 if (init
&& init
!= error_mark_node
)
6532 init_code
= build2 (INIT_EXPR
, type
, decl
, init
);
6536 /* We might have set these in cp_finish_decl. */
6537 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
) = false;
6538 TREE_CONSTANT (decl
) = false;
6542 && (DECL_IN_AGGR_P (decl
)
6543 && DECL_INITIALIZED_IN_CLASS_P (decl
)
6544 && !DECL_VAR_DECLARED_INLINE_P (decl
)))
6546 static int explained
= 0;
6548 if (cxx_dialect
< cxx11
)
6549 error ("initializer invalid for static member with constructor");
6550 else if (cxx_dialect
< cxx17
)
6551 error ("non-constant in-class initialization invalid for static "
6552 "member %qD", decl
);
6554 error ("non-constant in-class initialization invalid for non-inline "
6555 "static member %qD", decl
);
6558 inform (input_location
,
6559 "(an out of class initialization is required)");
6568 /* If DECL is not a local variable, give it RTL. */
6571 make_rtl_for_nonlocal_decl (tree decl
, tree init
, const char* asmspec
)
6573 int toplev
= toplevel_bindings_p ();
6576 /* Set the DECL_ASSEMBLER_NAME for the object. */
6579 /* The `register' keyword, when used together with an
6580 asm-specification, indicates that the variable should be
6581 placed in a particular register. */
6582 if (VAR_P (decl
) && DECL_REGISTER (decl
))
6584 set_user_assembler_name (decl
, asmspec
);
6585 DECL_HARD_REGISTER (decl
) = 1;
6589 if (TREE_CODE (decl
) == FUNCTION_DECL
6590 && fndecl_built_in_p (decl
, BUILT_IN_NORMAL
))
6591 set_builtin_user_assembler_name (decl
, asmspec
);
6592 set_user_assembler_name (decl
, asmspec
);
6596 /* Handle non-variables up front. */
6599 rest_of_decl_compilation (decl
, toplev
, at_eof
);
6603 /* If we see a class member here, it should be a static data
6605 if (DECL_LANG_SPECIFIC (decl
) && DECL_IN_AGGR_P (decl
))
6607 gcc_assert (TREE_STATIC (decl
));
6608 /* An in-class declaration of a static data member should be
6609 external; it is only a declaration, and not a definition. */
6610 if (init
== NULL_TREE
)
6611 gcc_assert (DECL_EXTERNAL (decl
)
6612 || !TREE_PUBLIC (decl
)
6613 || DECL_INLINE_VAR_P (decl
));
6616 /* We don't create any RTL for local variables. */
6617 if (DECL_FUNCTION_SCOPE_P (decl
) && !TREE_STATIC (decl
))
6620 /* We defer emission of local statics until the corresponding
6621 DECL_EXPR is expanded. But with constexpr its function might never
6622 be expanded, so go ahead and tell cgraph about the variable now. */
6623 defer_p
= ((DECL_FUNCTION_SCOPE_P (decl
)
6624 && !var_in_maybe_constexpr_fn (decl
))
6625 || DECL_VIRTUAL_P (decl
));
6627 /* Defer template instantiations. */
6628 if (DECL_LANG_SPECIFIC (decl
)
6629 && DECL_IMPLICIT_INSTANTIATION (decl
))
6632 /* If we're not deferring, go ahead and assemble the variable. */
6634 rest_of_decl_compilation (decl
, toplev
, at_eof
);
6637 /* walk_tree helper for wrap_temporary_cleanups, below. */
6640 wrap_cleanups_r (tree
*stmt_p
, int *walk_subtrees
, void *data
)
6642 /* Stop at types or full-expression boundaries. */
6643 if (TYPE_P (*stmt_p
)
6644 || TREE_CODE (*stmt_p
) == CLEANUP_POINT_EXPR
)
6650 if (TREE_CODE (*stmt_p
) == TARGET_EXPR
)
6652 tree guard
= (tree
)data
;
6653 tree tcleanup
= TARGET_EXPR_CLEANUP (*stmt_p
);
6655 tcleanup
= build2 (TRY_CATCH_EXPR
, void_type_node
, tcleanup
, guard
);
6656 /* Tell honor_protect_cleanup_actions to handle this as a separate
6658 TRY_CATCH_IS_CLEANUP (tcleanup
) = 1;
6660 TARGET_EXPR_CLEANUP (*stmt_p
) = tcleanup
;
6666 /* We're initializing a local variable which has a cleanup GUARD. If there
6667 are any temporaries used in the initializer INIT of this variable, we
6668 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
6669 variable will be cleaned up properly if one of them throws.
6671 Unfortunately, there's no way to express this properly in terms of
6672 nesting, as the regions for the temporaries overlap the region for the
6673 variable itself; if there are two temporaries, the variable needs to be
6674 the first thing destroyed if either of them throws. However, we only
6675 want to run the variable's cleanup if it actually got constructed. So
6676 we need to guard the temporary cleanups with the variable's cleanup if
6677 they are run on the normal path, but not if they are run on the
6678 exceptional path. We implement this by telling
6679 honor_protect_cleanup_actions to strip the variable cleanup from the
6680 exceptional path. */
6683 wrap_temporary_cleanups (tree init
, tree guard
)
6685 cp_walk_tree_without_duplicates (&init
, wrap_cleanups_r
, (void *)guard
);
6688 /* Generate code to initialize DECL (a local variable). */
6691 initialize_local_var (tree decl
, tree init
)
6693 tree type
= TREE_TYPE (decl
);
6697 gcc_assert (VAR_P (decl
)
6698 || TREE_CODE (decl
) == RESULT_DECL
);
6699 gcc_assert (!TREE_STATIC (decl
));
6701 if (DECL_SIZE (decl
) == NULL_TREE
)
6703 /* If we used it already as memory, it must stay in memory. */
6704 DECL_INITIAL (decl
) = NULL_TREE
;
6705 TREE_ADDRESSABLE (decl
) = TREE_USED (decl
);
6709 if (type
== error_mark_node
)
6712 /* Compute and store the initial value. */
6713 already_used
= TREE_USED (decl
) || TREE_USED (type
);
6714 if (TREE_USED (type
))
6715 DECL_READ_P (decl
) = 1;
6717 /* Generate a cleanup, if necessary. */
6718 cleanup
= cxx_maybe_build_cleanup (decl
, tf_warning_or_error
);
6720 /* Perform the initialization. */
6723 tree rinit
= (TREE_CODE (init
) == INIT_EXPR
6724 ? TREE_OPERAND (init
, 1) : NULL_TREE
);
6725 if (rinit
&& !TREE_SIDE_EFFECTS (rinit
))
6727 /* Stick simple initializers in DECL_INITIAL so that
6728 -Wno-init-self works (c++/34772). */
6729 gcc_assert (TREE_OPERAND (init
, 0) == decl
);
6730 DECL_INITIAL (decl
) = rinit
;
6732 if (warn_init_self
&& TYPE_REF_P (type
))
6736 warning_at (DECL_SOURCE_LOCATION (decl
),
6738 "reference %qD is initialized with itself", decl
);
6743 int saved_stmts_are_full_exprs_p
;
6745 /* If we're only initializing a single object, guard the
6746 destructors of any temporaries used in its initializer with
6747 its destructor. This isn't right for arrays because each
6748 element initialization is a full-expression. */
6749 if (cleanup
&& TREE_CODE (type
) != ARRAY_TYPE
)
6750 wrap_temporary_cleanups (init
, cleanup
);
6752 gcc_assert (building_stmt_list_p ());
6753 saved_stmts_are_full_exprs_p
= stmts_are_full_exprs_p ();
6754 current_stmt_tree ()->stmts_are_full_exprs_p
= 1;
6755 finish_expr_stmt (init
);
6756 current_stmt_tree ()->stmts_are_full_exprs_p
=
6757 saved_stmts_are_full_exprs_p
;
6761 /* Set this to 0 so we can tell whether an aggregate which was
6762 initialized was ever used. Don't do this if it has a
6763 destructor, so we don't complain about the 'resource
6764 allocation is initialization' idiom. Now set
6765 attribute((unused)) on types so decls of that type will be
6766 marked used. (see TREE_USED, above.) */
6767 if (TYPE_NEEDS_CONSTRUCTING (type
)
6769 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type
)
6770 && DECL_NAME (decl
))
6771 TREE_USED (decl
) = 0;
6772 else if (already_used
)
6773 TREE_USED (decl
) = 1;
6776 finish_decl_cleanup (decl
, cleanup
);
6779 /* DECL is a VAR_DECL for a compiler-generated variable with static
6780 storage duration (like a virtual table) whose initializer is a
6781 compile-time constant. Initialize the variable and provide it to the
6785 initialize_artificial_var (tree decl
, vec
<constructor_elt
, va_gc
> *v
)
6788 gcc_assert (DECL_ARTIFICIAL (decl
));
6789 init
= build_constructor (TREE_TYPE (decl
), v
);
6790 gcc_assert (TREE_CODE (init
) == CONSTRUCTOR
);
6791 DECL_INITIAL (decl
) = init
;
6792 DECL_INITIALIZED_P (decl
) = 1;
6793 /* Mark the decl as constexpr so that we can access its content
6795 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
) = true;
6796 DECL_DECLARED_CONSTEXPR_P (decl
) = true;
6797 determine_visibility (decl
);
6798 layout_var_decl (decl
);
6799 maybe_commonize_var (decl
);
6800 make_rtl_for_nonlocal_decl (decl
, init
, /*asmspec=*/NULL
);
6803 /* INIT is the initializer for a variable, as represented by the
6804 parser. Returns true iff INIT is value-dependent. */
6807 value_dependent_init_p (tree init
)
6809 if (TREE_CODE (init
) == TREE_LIST
)
6810 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
6811 return any_value_dependent_elements_p (init
);
6812 else if (TREE_CODE (init
) == CONSTRUCTOR
)
6813 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
6815 if (dependent_type_p (TREE_TYPE (init
)))
6818 vec
<constructor_elt
, va_gc
> *elts
;
6822 elts
= CONSTRUCTOR_ELTS (init
);
6823 nelts
= vec_safe_length (elts
);
6824 for (i
= 0; i
< nelts
; ++i
)
6825 if (value_dependent_init_p ((*elts
)[i
].value
))
6829 /* It must be a simple expression, e.g., int i = 3; */
6830 return value_dependent_expression_p (init
);
6835 // Returns true if a DECL is VAR_DECL with the concept specifier.
6837 is_concept_var (tree decl
)
6839 return (VAR_P (decl
)
6840 // Not all variables have DECL_LANG_SPECIFIC.
6841 && DECL_LANG_SPECIFIC (decl
)
6842 && DECL_DECLARED_CONCEPT_P (decl
));
6845 /* A helper function to be called via walk_tree. If any label exists
6846 under *TP, it is (going to be) forced. Set has_forced_label_in_static. */
6849 notice_forced_label_r (tree
*tp
, int *walk_subtrees
, void *)
6853 if (TREE_CODE (*tp
) == LABEL_DECL
)
6854 cfun
->has_forced_label_in_static
= 1;
6858 /* Finish processing of a declaration;
6859 install its line number and initial value.
6860 If the length of an array type is not known before,
6861 it must be determined now, from the initial value, or it is an error.
6863 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
6864 true, then INIT is an integral constant expression.
6866 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
6867 if the (init) syntax was used. */
6870 cp_finish_decl (tree decl
, tree init
, bool init_const_expr_p
,
6871 tree asmspec_tree
, int flags
)
6874 vec
<tree
, va_gc
> *cleanups
= NULL
;
6875 const char *asmspec
= NULL
;
6876 int was_readonly
= 0;
6877 bool var_definition_p
= false;
6880 if (decl
== error_mark_node
)
6885 error ("assignment (not initialization) in declaration");
6889 gcc_assert (TREE_CODE (decl
) != RESULT_DECL
);
6890 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
6891 gcc_assert (TREE_CODE (decl
) != PARM_DECL
);
6893 type
= TREE_TYPE (decl
);
6894 if (type
== error_mark_node
)
6897 /* Warn about register storage specifiers except when in GNU global
6898 or local register variable extension. */
6899 if (VAR_P (decl
) && DECL_REGISTER (decl
) && asmspec_tree
== NULL_TREE
)
6901 if (cxx_dialect
>= cxx17
)
6902 pedwarn (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
6903 "ISO C++17 does not allow %<register%> storage "
6906 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
6907 "%<register%> storage class specifier used");
6910 /* If a name was specified, get the string. */
6911 if (at_namespace_scope_p ())
6912 asmspec_tree
= maybe_apply_renaming_pragma (decl
, asmspec_tree
);
6913 if (asmspec_tree
&& asmspec_tree
!= error_mark_node
)
6914 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
6916 if (current_class_type
6917 && CP_DECL_CONTEXT (decl
) == current_class_type
6918 && TYPE_BEING_DEFINED (current_class_type
)
6919 && !CLASSTYPE_TEMPLATE_INSTANTIATION (current_class_type
)
6920 && (DECL_INITIAL (decl
) || init
))
6921 DECL_INITIALIZED_IN_CLASS_P (decl
) = 1;
6923 /* Do auto deduction unless decl is a function or an uninstantiated
6924 template specialization. */
6925 if (TREE_CODE (decl
) != FUNCTION_DECL
6926 && !(init
== NULL_TREE
6927 && DECL_LANG_SPECIFIC (decl
)
6928 && DECL_TEMPLATE_INSTANTIATION (decl
)
6929 && !DECL_TEMPLATE_INSTANTIATED (decl
))
6930 && (auto_node
= type_uses_auto (type
)))
6933 if (init
== NULL_TREE
)
6934 gcc_assert (CLASS_PLACEHOLDER_TEMPLATE (auto_node
));
6938 if (TREE_CODE (d_init
) == TREE_LIST
6939 && !CLASS_PLACEHOLDER_TEMPLATE (auto_node
))
6940 d_init
= build_x_compound_expr_from_list (d_init
, ELK_INIT
,
6941 tf_warning_or_error
);
6942 d_init
= resolve_nondeduced_context (d_init
, tf_warning_or_error
);
6944 enum auto_deduction_context adc
= adc_variable_type
;
6945 if (VAR_P (decl
) && DECL_DECOMPOSITION_P (decl
))
6946 adc
= adc_decomp_type
;
6947 type
= TREE_TYPE (decl
) = do_auto_deduction (type
, d_init
, auto_node
,
6948 tf_warning_or_error
, adc
,
6950 if (type
== error_mark_node
)
6952 if (TREE_CODE (type
) == FUNCTION_TYPE
)
6954 error ("initializer for %<decltype(auto) %D%> has function type "
6955 "(did you forget the %<()%> ?)", decl
);
6956 TREE_TYPE (decl
) = error_mark_node
;
6959 cp_apply_type_quals_to_decl (cp_type_quals (type
), decl
);
6962 if (ensure_literal_type_for_constexpr_object (decl
) == error_mark_node
)
6964 DECL_DECLARED_CONSTEXPR_P (decl
) = 0;
6965 if (VAR_P (decl
) && DECL_CLASS_SCOPE_P (decl
))
6968 DECL_EXTERNAL (decl
) = 1;
6973 && DECL_CLASS_SCOPE_P (decl
)
6974 && DECL_INITIALIZED_IN_CLASS_P (decl
))
6975 check_static_variable_definition (decl
, type
);
6977 if (init
&& TREE_CODE (decl
) == FUNCTION_DECL
)
6980 if (init
== ridpointers
[(int)RID_DELETE
])
6982 /* FIXME check this is 1st decl. */
6983 DECL_DELETED_FN (decl
) = 1;
6984 DECL_DECLARED_INLINE_P (decl
) = 1;
6985 DECL_INITIAL (decl
) = error_mark_node
;
6986 FOR_EACH_CLONE (clone
, decl
)
6988 DECL_DELETED_FN (clone
) = 1;
6989 DECL_DECLARED_INLINE_P (clone
) = 1;
6990 DECL_INITIAL (clone
) = error_mark_node
;
6994 else if (init
== ridpointers
[(int)RID_DEFAULT
])
6996 if (defaultable_fn_check (decl
))
6997 DECL_DEFAULTED_FN (decl
) = 1;
6999 DECL_INITIAL (decl
) = NULL_TREE
;
7003 if (init
&& VAR_P (decl
))
7005 DECL_NONTRIVIALLY_INITIALIZED_P (decl
) = 1;
7006 /* If DECL is a reference, then we want to know whether init is a
7007 reference constant; init_const_expr_p as passed tells us whether
7008 it's an rvalue constant. */
7009 if (TYPE_REF_P (type
))
7010 init_const_expr_p
= potential_constant_expression (init
);
7011 if (init_const_expr_p
)
7013 /* Set these flags now for templates. We'll update the flags in
7014 store_init_value for instantiations. */
7015 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
) = 1;
7016 if (decl_maybe_constant_var_p (decl
)
7017 /* FIXME setting TREE_CONSTANT on refs breaks the back end. */
7018 && !TYPE_REF_P (type
))
7019 TREE_CONSTANT (decl
) = 1;
7023 if (processing_template_decl
)
7025 bool type_dependent_p
;
7027 /* Add this declaration to the statement-tree. */
7028 if (at_function_scope_p ())
7029 add_decl_expr (decl
);
7031 type_dependent_p
= dependent_type_p (type
);
7033 if (check_for_bare_parameter_packs (init
))
7036 DECL_INITIAL (decl
) = NULL_TREE
;
7039 /* Generally, initializers in templates are expanded when the
7040 template is instantiated. But, if DECL is a variable constant
7041 then it can be used in future constant expressions, so its value
7042 must be available. */
7044 bool dep_init
= false;
7046 if (!VAR_P (decl
) || type_dependent_p
)
7047 /* We can't do anything if the decl has dependent type. */;
7048 else if (!init
&& is_concept_var (decl
))
7050 error ("variable concept has no initializer");
7051 init
= boolean_true_node
;
7054 && init_const_expr_p
7055 && !TYPE_REF_P (type
)
7056 && decl_maybe_constant_var_p (decl
)
7057 && !(dep_init
= value_dependent_init_p (init
)))
7059 /* This variable seems to be a non-dependent constant, so process
7060 its initializer. If check_initializer returns non-null the
7061 initialization wasn't constant after all. */
7063 cleanups
= make_tree_vector ();
7064 init_code
= check_initializer (decl
, init
, flags
, &cleanups
);
7065 if (init_code
== NULL_TREE
)
7067 release_tree_vector (cleanups
);
7071 gcc_assert (!DECL_PRETTY_FUNCTION_P (decl
));
7072 /* Deduce array size even if the initializer is dependent. */
7073 maybe_deduce_size_from_array_init (decl
, init
);
7074 /* And complain about multiple initializers. */
7075 if (init
&& TREE_CODE (init
) == TREE_LIST
&& TREE_CHAIN (init
)
7076 && !MAYBE_CLASS_TYPE_P (type
))
7077 init
= build_x_compound_expr_from_list (init
, ELK_INIT
,
7078 tf_warning_or_error
);
7082 DECL_INITIAL (decl
) = init
;
7086 retrofit_lang_decl (decl
);
7087 SET_DECL_DEPENDENT_INIT_P (decl
, true);
7092 /* Just store non-static data member initializers for later. */
7093 if (init
&& TREE_CODE (decl
) == FIELD_DECL
)
7094 DECL_INITIAL (decl
) = init
;
7096 /* Take care of TYPE_DECLs up front. */
7097 if (TREE_CODE (decl
) == TYPE_DECL
)
7099 if (type
!= error_mark_node
7100 && MAYBE_CLASS_TYPE_P (type
) && DECL_NAME (decl
))
7102 if (TREE_TYPE (DECL_NAME (decl
)) && TREE_TYPE (decl
) != type
)
7103 warning (0, "shadowing previous type declaration of %q#D", decl
);
7104 set_identifier_type_value (DECL_NAME (decl
), decl
);
7107 /* If we have installed this as the canonical typedef for this
7108 type, and that type has not been defined yet, delay emitting
7109 the debug information for it, as we will emit it later. */
7110 if (TYPE_MAIN_DECL (TREE_TYPE (decl
)) == decl
7111 && !COMPLETE_TYPE_P (TREE_TYPE (decl
)))
7112 TYPE_DECL_SUPPRESS_DEBUG (decl
) = 1;
7114 rest_of_decl_compilation (decl
, DECL_FILE_SCOPE_P (decl
),
7119 /* A reference will be modified here, as it is initialized. */
7120 if (! DECL_EXTERNAL (decl
)
7121 && TREE_READONLY (decl
)
7122 && TYPE_REF_P (type
))
7125 TREE_READONLY (decl
) = 0;
7130 /* If this is a local variable that will need a mangled name,
7131 register it now. We must do this before processing the
7132 initializer for the variable, since the initialization might
7133 require a guard variable, and since the mangled name of the
7134 guard variable will depend on the mangled name of this
7136 if (DECL_FUNCTION_SCOPE_P (decl
)
7137 && TREE_STATIC (decl
)
7138 && !DECL_ARTIFICIAL (decl
))
7140 /* The variable holding an anonymous union will have had its
7141 discriminator set in finish_anon_union, after which it's
7142 NAME will have been cleared. */
7143 if (DECL_NAME (decl
))
7144 determine_local_discriminator (decl
);
7145 /* Normally has_forced_label_in_static is set during GIMPLE
7146 lowering, but [cd]tors are never actually compiled directly.
7147 We need to set this early so we can deal with the label
7148 address extension. */
7149 if ((DECL_CONSTRUCTOR_P (current_function_decl
)
7150 || DECL_DESTRUCTOR_P (current_function_decl
))
7153 walk_tree (&init
, notice_forced_label_r
, NULL
, NULL
);
7154 add_local_decl (cfun
, decl
);
7156 /* And make sure it's in the symbol table for
7157 c_parse_final_cleanups to find. */
7158 varpool_node::get_create (decl
);
7161 /* Convert the initializer to the type of DECL, if we have not
7162 already initialized DECL. */
7163 if (!DECL_INITIALIZED_P (decl
)
7164 /* If !DECL_EXTERNAL then DECL is being defined. In the
7165 case of a static data member initialized inside the
7166 class-specifier, there can be an initializer even if DECL
7167 is *not* defined. */
7168 && (!DECL_EXTERNAL (decl
) || init
))
7170 cleanups
= make_tree_vector ();
7171 init
= check_initializer (decl
, init
, flags
, &cleanups
);
7177 The memory occupied by any object of static storage
7178 duration is zero-initialized at program startup before
7179 any other initialization takes place.
7181 We cannot create an appropriate initializer until after
7182 the type of DECL is finalized. If DECL_INITIAL is set,
7183 then the DECL is statically initialized, and any
7184 necessary zero-initialization has already been performed. */
7185 if (TREE_STATIC (decl
) && !DECL_INITIAL (decl
))
7186 DECL_INITIAL (decl
) = build_zero_init (TREE_TYPE (decl
),
7187 /*nelts=*/NULL_TREE
,
7188 /*static_storage_p=*/true);
7189 /* Remember that the initialization for this variable has
7191 DECL_INITIALIZED_P (decl
) = 1;
7192 /* This declaration is the definition of this variable,
7193 unless we are initializing a static data member within
7194 the class specifier. */
7195 if (!DECL_EXTERNAL (decl
))
7196 var_definition_p
= true;
7198 /* If the variable has an array type, lay out the type, even if
7199 there is no initializer. It is valid to index through the
7200 array, and we must get TYPE_ALIGN set correctly on the array
7202 else if (TREE_CODE (type
) == ARRAY_TYPE
)
7205 if (TREE_STATIC (decl
)
7206 && !at_function_scope_p ()
7207 && current_function_decl
== NULL
)
7208 /* So decl is a global variable or a static member of a
7209 non local class. Record the types it uses
7210 so that we can decide later to emit debug info for them. */
7211 record_types_used_by_current_var_decl (decl
);
7214 /* Add this declaration to the statement-tree. This needs to happen
7215 after the call to check_initializer so that the DECL_EXPR for a
7216 reference temp is added before the DECL_EXPR for the reference itself. */
7217 if (DECL_FUNCTION_SCOPE_P (decl
))
7219 /* If we're building a variable sized type, and we might be
7220 reachable other than via the top of the current binding
7221 level, then create a new BIND_EXPR so that we deallocate
7222 the object at the right time. */
7225 && !TREE_CONSTANT (DECL_SIZE (decl
))
7226 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list
))
7229 bind
= build3 (BIND_EXPR
, void_type_node
, NULL
, NULL
, NULL
);
7230 TREE_SIDE_EFFECTS (bind
) = 1;
7232 BIND_EXPR_BODY (bind
) = push_stmt_list ();
7234 add_decl_expr (decl
);
7237 /* Let the middle end know about variables and functions -- but not
7238 static data members in uninstantiated class templates. */
7239 if (VAR_OR_FUNCTION_DECL_P (decl
))
7243 layout_var_decl (decl
);
7244 maybe_commonize_var (decl
);
7247 /* This needs to happen after the linkage is set. */
7248 determine_visibility (decl
);
7250 if (var_definition_p
&& TREE_STATIC (decl
))
7252 /* If a TREE_READONLY variable needs initialization
7253 at runtime, it is no longer readonly and we need to
7254 avoid MEM_READONLY_P being set on RTL created for it. */
7257 if (TREE_READONLY (decl
))
7258 TREE_READONLY (decl
) = 0;
7261 else if (was_readonly
)
7262 TREE_READONLY (decl
) = 1;
7264 /* Likewise if it needs destruction. */
7265 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
))
7266 TREE_READONLY (decl
) = 0;
7269 make_rtl_for_nonlocal_decl (decl
, init
, asmspec
);
7271 /* Check for abstractness of the type. Notice that there is no
7272 need to strip array types here since the check for those types
7273 is already done within create_array_type_for_decl. */
7274 abstract_virtuals_error (decl
, type
);
7276 if (TREE_TYPE (decl
) == error_mark_node
)
7277 /* No initialization required. */
7279 else if (TREE_CODE (decl
) == FUNCTION_DECL
)
7283 if (init
== ridpointers
[(int)RID_DEFAULT
])
7285 /* An out-of-class default definition is defined at
7286 the point where it is explicitly defaulted. */
7287 if (DECL_DELETED_FN (decl
))
7288 maybe_explain_implicit_delete (decl
);
7289 else if (DECL_INITIAL (decl
) == error_mark_node
)
7290 synthesize_method (decl
);
7293 error ("function %q#D is initialized like a variable", decl
);
7295 /* else no initialization required. */
7297 else if (DECL_EXTERNAL (decl
)
7298 && ! (DECL_LANG_SPECIFIC (decl
)
7299 && DECL_NOT_REALLY_EXTERN (decl
)))
7302 DECL_INITIAL (decl
) = init
;
7304 /* A variable definition. */
7305 else if (DECL_FUNCTION_SCOPE_P (decl
) && !TREE_STATIC (decl
))
7306 /* Initialize the local variable. */
7307 initialize_local_var (decl
, init
);
7309 /* If a variable is defined, and then a subsequent
7310 definition with external linkage is encountered, we will
7311 get here twice for the same variable. We want to avoid
7312 calling expand_static_init more than once. For variables
7313 that are not static data members, we can call
7314 expand_static_init only when we actually process the
7315 initializer. It is not legal to redeclare a static data
7316 member, so this issue does not arise in that case. */
7317 else if (var_definition_p
&& TREE_STATIC (decl
))
7318 expand_static_init (decl
, init
);
7321 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
7322 reference, insert it in the statement-tree now. */
7326 FOR_EACH_VEC_ELT (*cleanups
, i
, t
)
7327 push_cleanup (decl
, t
, false);
7328 release_tree_vector (cleanups
);
7332 TREE_READONLY (decl
) = 1;
7336 && lookup_attribute ("omp declare target implicit",
7337 DECL_ATTRIBUTES (decl
)))
7339 DECL_ATTRIBUTES (decl
)
7340 = remove_attribute ("omp declare target implicit",
7341 DECL_ATTRIBUTES (decl
));
7342 complete_type (TREE_TYPE (decl
));
7343 if (!cp_omp_mappable_type (TREE_TYPE (decl
)))
7344 error ("%q+D in declare target directive does not have mappable type",
7346 else if (!lookup_attribute ("omp declare target",
7347 DECL_ATTRIBUTES (decl
))
7348 && !lookup_attribute ("omp declare target link",
7349 DECL_ATTRIBUTES (decl
)))
7350 DECL_ATTRIBUTES (decl
)
7351 = tree_cons (get_identifier ("omp declare target"),
7352 NULL_TREE
, DECL_ATTRIBUTES (decl
));
7355 invoke_plugin_callbacks (PLUGIN_FINISH_DECL
, decl
);
7358 /* For class TYPE return itself or some its bases that contain
7359 any direct non-static data members. Return error_mark_node if an
7360 error has been diagnosed. */
7363 find_decomp_class_base (location_t loc
, tree type
, tree ret
)
7365 bool member_seen
= false;
7366 for (tree field
= TYPE_FIELDS (type
); field
; field
= DECL_CHAIN (field
))
7367 if (TREE_CODE (field
) != FIELD_DECL
7368 || DECL_ARTIFICIAL (field
)
7369 || DECL_UNNAMED_BIT_FIELD (field
))
7373 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field
)))
7375 if (TREE_CODE (TREE_TYPE (field
)) == RECORD_TYPE
)
7376 error_at (loc
, "cannot decompose class type %qT because it has an "
7377 "anonymous struct member", type
);
7379 error_at (loc
, "cannot decompose class type %qT because it has an "
7380 "anonymous union member", type
);
7381 inform (DECL_SOURCE_LOCATION (field
), "declared here");
7382 return error_mark_node
;
7384 else if (!accessible_p (type
, field
, true))
7386 error_at (loc
, "cannot decompose inaccessible member %qD of %qT",
7388 inform (DECL_SOURCE_LOCATION (field
),
7389 TREE_PRIVATE (field
)
7390 ? G_("declared private here")
7391 : G_("declared protected here"));
7392 return error_mark_node
;
7397 tree base_binfo
, binfo
;
7398 tree orig_ret
= ret
;
7402 for (binfo
= TYPE_BINFO (type
), i
= 0;
7403 BINFO_BASE_ITERATE (binfo
, i
, base_binfo
); i
++)
7405 tree t
= find_decomp_class_base (loc
, TREE_TYPE (base_binfo
), ret
);
7406 if (t
== error_mark_node
)
7407 return error_mark_node
;
7408 if (t
!= NULL_TREE
&& t
!= ret
)
7412 error_at (loc
, "cannot decompose class type %qT: both it and "
7413 "its base class %qT have non-static data members",
7415 return error_mark_node
;
7417 else if (orig_ret
!= NULL_TREE
)
7419 else if (ret
!= NULL_TREE
)
7421 error_at (loc
, "cannot decompose class type %qT: its base "
7422 "classes %qT and %qT have non-static data "
7423 "members", type
, ret
, t
);
7424 return error_mark_node
;
7433 /* Return std::tuple_size<TYPE>::value. */
7436 get_tuple_size (tree type
)
7438 tree args
= make_tree_vec (1);
7439 TREE_VEC_ELT (args
, 0) = type
;
7440 tree inst
= lookup_template_class (tuple_size_identifier
, args
,
7441 /*in_decl*/NULL_TREE
,
7442 /*context*/std_node
,
7443 /*entering_scope*/false, tf_none
);
7444 inst
= complete_type (inst
);
7445 if (inst
== error_mark_node
|| !COMPLETE_TYPE_P (inst
))
7447 tree val
= lookup_qualified_name (inst
, value_identifier
,
7448 /*type*/false, /*complain*/false);
7449 if (TREE_CODE (val
) == VAR_DECL
|| TREE_CODE (val
) == CONST_DECL
)
7450 val
= maybe_constant_value (val
);
7451 if (TREE_CODE (val
) == INTEGER_CST
)
7454 return error_mark_node
;
7457 /* Return std::tuple_element<I,TYPE>::type. */
7460 get_tuple_element_type (tree type
, unsigned i
)
7462 tree args
= make_tree_vec (2);
7463 TREE_VEC_ELT (args
, 0) = build_int_cst (integer_type_node
, i
);
7464 TREE_VEC_ELT (args
, 1) = type
;
7465 tree inst
= lookup_template_class (tuple_element_identifier
, args
,
7466 /*in_decl*/NULL_TREE
,
7467 /*context*/std_node
,
7468 /*entering_scope*/false,
7469 tf_warning_or_error
);
7470 return make_typename_type (inst
, type_identifier
,
7471 none_type
, tf_warning_or_error
);
7474 /* Return e.get<i>() or get<i>(e). */
7477 get_tuple_decomp_init (tree decl
, unsigned i
)
7479 tree targs
= make_tree_vec (1);
7480 TREE_VEC_ELT (targs
, 0) = build_int_cst (integer_type_node
, i
);
7482 tree etype
= TREE_TYPE (decl
);
7483 tree e
= convert_from_reference (decl
);
7485 /* [The id-expression] e is an lvalue if the type of the entity e is an
7486 lvalue reference and an xvalue otherwise. */
7487 if (!TYPE_REF_P (etype
)
7488 || TYPE_REF_IS_RVALUE (etype
))
7491 tree fns
= lookup_qualified_name (TREE_TYPE (e
), get__identifier
,
7492 /*type*/false, /*complain*/false);
7493 bool use_member_get
= false;
7495 /* To use a member get, member lookup must find at least one
7496 declaration that is a function template
7497 whose first template parameter is a non-type parameter. */
7498 for (lkp_iterator
iter (MAYBE_BASELINK_FUNCTIONS (fns
)); iter
; ++iter
)
7501 if (TREE_CODE (fn
) == TEMPLATE_DECL
)
7503 tree tparms
= DECL_TEMPLATE_PARMS (fn
);
7504 tree parm
= TREE_VEC_ELT (INNERMOST_TEMPLATE_PARMS (tparms
), 0);
7505 if (TREE_CODE (TREE_VALUE (parm
)) == PARM_DECL
)
7507 use_member_get
= true;
7515 fns
= lookup_template_function (fns
, targs
);
7516 return build_new_method_call (e
, fns
, /*args*/NULL
,
7517 /*path*/NULL_TREE
, LOOKUP_NORMAL
,
7518 /*fn_p*/NULL
, tf_warning_or_error
);
7522 vec
<tree
,va_gc
> *args
= make_tree_vector_single (e
);
7523 fns
= lookup_template_function (get__identifier
, targs
);
7524 fns
= perform_koenig_lookup (fns
, args
, tf_warning_or_error
);
7525 return finish_call_expr (fns
, &args
, /*novirt*/false,
7526 /*koenig*/true, tf_warning_or_error
);
7530 /* It's impossible to recover the decltype of a tuple decomposition variable
7531 based on the actual type of the variable, so store it in a hash table. */
7533 static GTY((cache
)) tree_cache_map
*decomp_type_table
;
7535 store_decomp_type (tree v
, tree t
)
7537 if (!decomp_type_table
)
7538 decomp_type_table
= tree_cache_map::create_ggc (13);
7539 decomp_type_table
->put (v
, t
);
7543 lookup_decomp_type (tree v
)
7545 return *decomp_type_table
->get (v
);
7548 /* Mangle a decomposition declaration if needed. Arguments like
7549 in cp_finish_decomp. */
7552 cp_maybe_mangle_decomp (tree decl
, tree first
, unsigned int count
)
7554 if (!processing_template_decl
7555 && !error_operand_p (decl
)
7556 && DECL_NAMESPACE_SCOPE_P (decl
))
7558 auto_vec
<tree
, 16> v
;
7559 v
.safe_grow (count
);
7561 for (unsigned int i
= 0; i
< count
; i
++, d
= DECL_CHAIN (d
))
7562 v
[count
- i
- 1] = d
;
7563 SET_DECL_ASSEMBLER_NAME (decl
, mangle_decomp (decl
, v
));
7564 maybe_apply_pragma_weak (decl
);
7568 /* Finish a decomposition declaration. DECL is the underlying declaration
7569 "e", FIRST is the head of a chain of decls for the individual identifiers
7570 chained through DECL_CHAIN in reverse order and COUNT is the number of
7574 cp_finish_decomp (tree decl
, tree first
, unsigned int count
)
7576 if (error_operand_p (decl
))
7581 TREE_TYPE (first
) = error_mark_node
;
7582 if (DECL_HAS_VALUE_EXPR_P (first
))
7584 SET_DECL_VALUE_EXPR (first
, NULL_TREE
);
7585 DECL_HAS_VALUE_EXPR_P (first
) = 0;
7587 first
= DECL_CHAIN (first
);
7589 if (DECL_P (decl
) && DECL_NAMESPACE_SCOPE_P (decl
))
7590 SET_DECL_ASSEMBLER_NAME (decl
, get_identifier ("<decomp>"));
7594 location_t loc
= DECL_SOURCE_LOCATION (decl
);
7595 if (type_dependent_expression_p (decl
)
7596 /* This happens for range for when not in templates.
7597 Still add the DECL_VALUE_EXPRs for later processing. */
7598 || (!processing_template_decl
7599 && type_uses_auto (TREE_TYPE (decl
))))
7601 for (unsigned int i
= 0; i
< count
; i
++)
7603 if (!DECL_HAS_VALUE_EXPR_P (first
))
7605 tree v
= build_nt (ARRAY_REF
, decl
,
7606 size_int (count
- i
- 1),
7607 NULL_TREE
, NULL_TREE
);
7608 SET_DECL_VALUE_EXPR (first
, v
);
7609 DECL_HAS_VALUE_EXPR_P (first
) = 1;
7611 if (processing_template_decl
)
7612 fit_decomposition_lang_decl (first
, decl
);
7613 first
= DECL_CHAIN (first
);
7618 auto_vec
<tree
, 16> v
;
7619 v
.safe_grow (count
);
7621 for (unsigned int i
= 0; i
< count
; i
++, d
= DECL_CHAIN (d
))
7623 v
[count
- i
- 1] = d
;
7624 fit_decomposition_lang_decl (d
, decl
);
7627 tree type
= TREE_TYPE (decl
);
7630 if (TYPE_REF_P (type
))
7632 dexp
= convert_from_reference (dexp
);
7633 type
= complete_type (TREE_TYPE (type
));
7634 if (type
== error_mark_node
)
7636 if (!COMPLETE_TYPE_P (type
))
7638 error_at (loc
, "structured binding refers to incomplete type %qT",
7644 tree eltype
= NULL_TREE
;
7645 unsigned HOST_WIDE_INT eltscnt
= 0;
7646 if (TREE_CODE (type
) == ARRAY_TYPE
)
7649 nelts
= array_type_nelts_top (type
);
7650 if (nelts
== error_mark_node
)
7652 if (!tree_fits_uhwi_p (nelts
))
7654 error_at (loc
, "cannot decompose variable length array %qT", type
);
7657 eltscnt
= tree_to_uhwi (nelts
);
7658 if (count
!= eltscnt
)
7661 if (count
> eltscnt
)
7662 error_n (loc
, count
,
7663 "%u name provided for structured binding",
7664 "%u names provided for structured binding", count
);
7666 error_n (loc
, count
,
7667 "only %u name provided for structured binding",
7668 "only %u names provided for structured binding", count
);
7669 inform_n (loc
, eltscnt
,
7670 "while %qT decomposes into %wu element",
7671 "while %qT decomposes into %wu elements",
7675 eltype
= TREE_TYPE (type
);
7676 for (unsigned int i
= 0; i
< count
; i
++)
7678 TREE_TYPE (v
[i
]) = eltype
;
7679 layout_decl (v
[i
], 0);
7680 if (processing_template_decl
)
7682 tree t
= unshare_expr (dexp
);
7683 t
= build4_loc (DECL_SOURCE_LOCATION (v
[i
]), ARRAY_REF
,
7684 eltype
, t
, size_int (i
), NULL_TREE
,
7686 SET_DECL_VALUE_EXPR (v
[i
], t
);
7687 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7690 /* 2 GNU extensions. */
7691 else if (TREE_CODE (type
) == COMPLEX_TYPE
)
7694 if (count
!= eltscnt
)
7696 eltype
= cp_build_qualified_type (TREE_TYPE (type
), TYPE_QUALS (type
));
7697 for (unsigned int i
= 0; i
< count
; i
++)
7699 TREE_TYPE (v
[i
]) = eltype
;
7700 layout_decl (v
[i
], 0);
7701 if (processing_template_decl
)
7703 tree t
= unshare_expr (dexp
);
7704 t
= build1_loc (DECL_SOURCE_LOCATION (v
[i
]),
7705 i
? IMAGPART_EXPR
: REALPART_EXPR
, eltype
,
7707 SET_DECL_VALUE_EXPR (v
[i
], t
);
7708 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7711 else if (TREE_CODE (type
) == VECTOR_TYPE
)
7713 if (!TYPE_VECTOR_SUBPARTS (type
).is_constant (&eltscnt
))
7715 error_at (loc
, "cannot decompose variable length vector %qT", type
);
7718 if (count
!= eltscnt
)
7720 eltype
= cp_build_qualified_type (TREE_TYPE (type
), TYPE_QUALS (type
));
7721 for (unsigned int i
= 0; i
< count
; i
++)
7723 TREE_TYPE (v
[i
]) = eltype
;
7724 layout_decl (v
[i
], 0);
7725 if (processing_template_decl
)
7727 tree t
= unshare_expr (dexp
);
7728 convert_vector_to_array_for_subscript (DECL_SOURCE_LOCATION (v
[i
]),
7730 t
= build4_loc (DECL_SOURCE_LOCATION (v
[i
]), ARRAY_REF
,
7731 eltype
, t
, size_int (i
), NULL_TREE
,
7733 SET_DECL_VALUE_EXPR (v
[i
], t
);
7734 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7737 else if (tree tsize
= get_tuple_size (type
))
7739 if (tsize
== error_mark_node
)
7741 error_at (loc
, "%<std::tuple_size<%T>::value%> is not an integral "
7742 "constant expression", type
);
7745 if (!tree_fits_uhwi_p (tsize
))
7747 error_n (loc
, count
,
7748 "%u name provided for structured binding",
7749 "%u names provided for structured binding", count
);
7750 inform (loc
, "while %qT decomposes into %E elements",
7754 eltscnt
= tree_to_uhwi (tsize
);
7755 if (count
!= eltscnt
)
7757 int save_read
= DECL_READ_P (decl
);
7758 for (unsigned i
= 0; i
< count
; ++i
)
7760 location_t sloc
= input_location
;
7761 location_t dloc
= DECL_SOURCE_LOCATION (v
[i
]);
7763 input_location
= dloc
;
7764 tree init
= get_tuple_decomp_init (decl
, i
);
7765 tree eltype
= (init
== error_mark_node
? error_mark_node
7766 : get_tuple_element_type (type
, i
));
7767 input_location
= sloc
;
7769 if (init
== error_mark_node
|| eltype
== error_mark_node
)
7771 inform (dloc
, "in initialization of structured binding "
7772 "variable %qD", v
[i
]);
7775 /* Save the decltype away before reference collapse. */
7776 store_decomp_type (v
[i
], eltype
);
7777 eltype
= cp_build_reference_type (eltype
, !lvalue_p (init
));
7778 TREE_TYPE (v
[i
]) = eltype
;
7779 layout_decl (v
[i
], 0);
7780 if (DECL_HAS_VALUE_EXPR_P (v
[i
]))
7782 /* In this case the names are variables, not just proxies. */
7783 SET_DECL_VALUE_EXPR (v
[i
], NULL_TREE
);
7784 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 0;
7786 if (!processing_template_decl
)
7787 cp_finish_decl (v
[i
], init
, /*constexpr*/false,
7788 /*asm*/NULL_TREE
, LOOKUP_NORMAL
);
7790 /* Ignore reads from the underlying decl performed during initialization
7791 of the individual variables. If those will be read, we'll mark
7792 the underlying decl as read at that point. */
7793 DECL_READ_P (decl
) = save_read
;
7795 else if (TREE_CODE (type
) == UNION_TYPE
)
7797 error_at (loc
, "cannot decompose union type %qT", type
);
7800 else if (!CLASS_TYPE_P (type
))
7802 error_at (loc
, "cannot decompose non-array non-class type %qT", type
);
7805 else if (LAMBDA_TYPE_P (type
))
7807 error_at (loc
, "cannot decompose lambda closure type %qT", type
);
7810 else if (processing_template_decl
&& !COMPLETE_TYPE_P (type
))
7811 pedwarn (loc
, 0, "structured binding refers to incomplete class type %qT",
7815 tree btype
= find_decomp_class_base (loc
, type
, NULL_TREE
);
7816 if (btype
== error_mark_node
)
7818 else if (btype
== NULL_TREE
)
7820 error_at (loc
, "cannot decompose class type %qT without non-static "
7821 "data members", type
);
7824 for (tree field
= TYPE_FIELDS (btype
); field
; field
= TREE_CHAIN (field
))
7825 if (TREE_CODE (field
) != FIELD_DECL
7826 || DECL_ARTIFICIAL (field
)
7827 || DECL_UNNAMED_BIT_FIELD (field
))
7831 if (count
!= eltscnt
)
7836 t
= convert_to_base (t
, btype
, /*check_access*/true,
7837 /*nonnull*/false, tf_warning_or_error
);
7841 for (tree field
= TYPE_FIELDS (btype
); field
; field
= TREE_CHAIN (field
))
7842 if (TREE_CODE (field
) != FIELD_DECL
7843 || DECL_ARTIFICIAL (field
)
7844 || DECL_UNNAMED_BIT_FIELD (field
))
7848 tree tt
= finish_non_static_data_member (field
, unshare_expr (t
),
7850 if (REFERENCE_REF_P (tt
))
7851 tt
= TREE_OPERAND (tt
, 0);
7852 TREE_TYPE (v
[i
]) = TREE_TYPE (tt
);
7853 layout_decl (v
[i
], 0);
7854 if (!processing_template_decl
)
7856 SET_DECL_VALUE_EXPR (v
[i
], tt
);
7857 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7862 if (processing_template_decl
)
7864 for (unsigned int i
= 0; i
< count
; i
++)
7865 if (!DECL_HAS_VALUE_EXPR_P (v
[i
]))
7867 tree a
= build_nt (ARRAY_REF
, decl
, size_int (i
),
7868 NULL_TREE
, NULL_TREE
);
7869 SET_DECL_VALUE_EXPR (v
[i
], a
);
7870 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7875 /* Returns a declaration for a VAR_DECL as if:
7877 extern "C" TYPE NAME;
7879 had been seen. Used to create compiler-generated global
7883 declare_global_var (tree name
, tree type
)
7887 push_to_top_level ();
7888 decl
= build_decl (input_location
, VAR_DECL
, name
, type
);
7889 TREE_PUBLIC (decl
) = 1;
7890 DECL_EXTERNAL (decl
) = 1;
7891 DECL_ARTIFICIAL (decl
) = 1;
7892 DECL_CONTEXT (decl
) = FROB_CONTEXT (global_namespace
);
7893 /* If the user has explicitly declared this variable (perhaps
7894 because the code we are compiling is part of a low-level runtime
7895 library), then it is possible that our declaration will be merged
7896 with theirs by pushdecl. */
7897 decl
= pushdecl (decl
);
7898 cp_finish_decl (decl
, NULL_TREE
, false, NULL_TREE
, 0);
7899 pop_from_top_level ();
7904 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
7905 if "__cxa_atexit" is not being used) corresponding to the function
7906 to be called when the program exits. */
7909 get_atexit_fn_ptr_type (void)
7913 if (!atexit_fn_ptr_type_node
)
7916 if (flag_use_cxa_atexit
7917 && !targetm
.cxx
.use_atexit_for_cxa_atexit ())
7918 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
7919 arg_type
= ptr_type_node
;
7921 /* The parameter to "atexit" is "void (*)(void)". */
7922 arg_type
= NULL_TREE
;
7924 fn_type
= build_function_type_list (void_type_node
,
7925 arg_type
, NULL_TREE
);
7926 atexit_fn_ptr_type_node
= build_pointer_type (fn_type
);
7929 return atexit_fn_ptr_type_node
;
7932 /* Returns a pointer to the `atexit' function. Note that if
7933 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
7934 `__cxa_atexit' function specified in the IA64 C++ ABI. */
7937 get_atexit_node (void)
7943 bool use_aeabi_atexit
;
7948 if (flag_use_cxa_atexit
&& !targetm
.cxx
.use_atexit_for_cxa_atexit ())
7950 /* The declaration for `__cxa_atexit' is:
7952 int __cxa_atexit (void (*)(void *), void *, void *)
7954 We build up the argument types and then the function type
7956 tree argtype0
, argtype1
, argtype2
;
7958 use_aeabi_atexit
= targetm
.cxx
.use_aeabi_atexit ();
7959 /* First, build the pointer-to-function type for the first
7961 fn_ptr_type
= get_atexit_fn_ptr_type ();
7962 /* Then, build the rest of the argument types. */
7963 argtype2
= ptr_type_node
;
7964 if (use_aeabi_atexit
)
7966 argtype1
= fn_ptr_type
;
7967 argtype0
= ptr_type_node
;
7971 argtype1
= ptr_type_node
;
7972 argtype0
= fn_ptr_type
;
7974 /* And the final __cxa_atexit type. */
7975 fn_type
= build_function_type_list (integer_type_node
,
7976 argtype0
, argtype1
, argtype2
,
7978 if (use_aeabi_atexit
)
7979 name
= "__aeabi_atexit";
7981 name
= "__cxa_atexit";
7985 /* The declaration for `atexit' is:
7987 int atexit (void (*)());
7989 We build up the argument types and then the function type
7991 fn_ptr_type
= get_atexit_fn_ptr_type ();
7992 /* Build the final atexit type. */
7993 fn_type
= build_function_type_list (integer_type_node
,
7994 fn_ptr_type
, NULL_TREE
);
7998 /* Now, build the function declaration. */
7999 push_lang_context (lang_name_c
);
8000 atexit_fndecl
= build_library_fn_ptr (name
, fn_type
, ECF_LEAF
| ECF_NOTHROW
);
8001 mark_used (atexit_fndecl
);
8002 pop_lang_context ();
8003 atexit_node
= decay_conversion (atexit_fndecl
, tf_warning_or_error
);
8008 /* Like get_atexit_node, but for thread-local cleanups. */
8011 get_thread_atexit_node (void)
8013 /* The declaration for `__cxa_thread_atexit' is:
8015 int __cxa_thread_atexit (void (*)(void *), void *, void *) */
8016 tree fn_type
= build_function_type_list (integer_type_node
,
8017 get_atexit_fn_ptr_type (),
8018 ptr_type_node
, ptr_type_node
,
8021 /* Now, build the function declaration. */
8022 tree atexit_fndecl
= build_library_fn_ptr ("__cxa_thread_atexit", fn_type
,
8023 ECF_LEAF
| ECF_NOTHROW
);
8024 return decay_conversion (atexit_fndecl
, tf_warning_or_error
);
8027 /* Returns the __dso_handle VAR_DECL. */
8030 get_dso_handle_node (void)
8032 if (dso_handle_node
)
8033 return dso_handle_node
;
8035 /* Declare the variable. */
8036 dso_handle_node
= declare_global_var (get_identifier ("__dso_handle"),
8039 #ifdef HAVE_GAS_HIDDEN
8040 if (dso_handle_node
!= error_mark_node
)
8042 DECL_VISIBILITY (dso_handle_node
) = VISIBILITY_HIDDEN
;
8043 DECL_VISIBILITY_SPECIFIED (dso_handle_node
) = 1;
8047 return dso_handle_node
;
8050 /* Begin a new function with internal linkage whose job will be simply
8051 to destroy some particular variable. */
8053 static GTY(()) int start_cleanup_cnt
;
8056 start_cleanup_fn (void)
8061 bool use_cxa_atexit
= flag_use_cxa_atexit
8062 && !targetm
.cxx
.use_atexit_for_cxa_atexit ();
8064 push_to_top_level ();
8066 /* No need to mangle this. */
8067 push_lang_context (lang_name_c
);
8069 /* Build the name of the function. */
8070 sprintf (name
, "__tcf_%d", start_cleanup_cnt
++);
8071 /* Build the function declaration. */
8072 fntype
= TREE_TYPE (get_atexit_fn_ptr_type ());
8073 fndecl
= build_lang_decl (FUNCTION_DECL
, get_identifier (name
), fntype
);
8074 /* It's a function with internal linkage, generated by the
8076 TREE_PUBLIC (fndecl
) = 0;
8077 DECL_ARTIFICIAL (fndecl
) = 1;
8078 /* Make the function `inline' so that it is only emitted if it is
8079 actually needed. It is unlikely that it will be inlined, since
8080 it is only called via a function pointer, but we avoid unnecessary
8081 emissions this way. */
8082 DECL_DECLARED_INLINE_P (fndecl
) = 1;
8083 DECL_INTERFACE_KNOWN (fndecl
) = 1;
8084 /* Build the parameter. */
8087 tree parmdecl
= cp_build_parm_decl (fndecl
, NULL_TREE
, ptr_type_node
);
8088 TREE_USED (parmdecl
) = 1;
8089 DECL_READ_P (parmdecl
) = 1;
8090 DECL_ARGUMENTS (fndecl
) = parmdecl
;
8094 start_preparsed_function (fndecl
, NULL_TREE
, SF_PRE_PARSED
);
8096 pop_lang_context ();
8098 return current_function_decl
;
8101 /* Finish the cleanup function begun by start_cleanup_fn. */
8104 end_cleanup_fn (void)
8106 expand_or_defer_fn (finish_function (/*inline_p=*/false));
8108 pop_from_top_level ();
8111 /* Generate code to handle the destruction of DECL, an object with
8112 static storage duration. */
8115 register_dtor_fn (tree decl
)
8122 bool ob_parm
, dso_parm
, use_dtor
;
8123 tree arg0
, arg1
, arg2
;
8126 type
= TREE_TYPE (decl
);
8127 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type
))
8130 /* If we're using "__cxa_atexit" (or "__cxa_thread_atexit" or
8131 "__aeabi_atexit"), and DECL is a class object, we can just pass the
8132 destructor to "__cxa_atexit"; we don't have to build a temporary
8133 function to do the cleanup. */
8134 dso_parm
= (flag_use_cxa_atexit
8135 && !targetm
.cxx
.use_atexit_for_cxa_atexit ());
8136 ob_parm
= (CP_DECL_THREAD_LOCAL_P (decl
) || dso_parm
);
8137 use_dtor
= ob_parm
&& CLASS_TYPE_P (type
);
8140 cleanup
= get_class_binding (type
, complete_dtor_identifier
);
8142 /* Make sure it is accessible. */
8143 perform_or_defer_access_check (TYPE_BINFO (type
), cleanup
, cleanup
,
8144 tf_warning_or_error
);
8148 /* Call build_cleanup before we enter the anonymous function so
8149 that any access checks will be done relative to the current
8150 scope, rather than the scope of the anonymous function. */
8151 build_cleanup (decl
);
8153 /* Now start the function. */
8154 cleanup
= start_cleanup_fn ();
8156 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
8157 to the original function, rather than the anonymous one. That
8158 will make the back end think that nested functions are in use,
8159 which causes confusion. */
8160 push_deferring_access_checks (dk_no_check
);
8161 fcall
= build_cleanup (decl
);
8162 pop_deferring_access_checks ();
8164 /* Create the body of the anonymous function. */
8165 compound_stmt
= begin_compound_stmt (BCS_FN_BODY
);
8166 finish_expr_stmt (fcall
);
8167 finish_compound_stmt (compound_stmt
);
8171 /* Call atexit with the cleanup function. */
8172 mark_used (cleanup
);
8173 cleanup
= build_address (cleanup
);
8175 if (CP_DECL_THREAD_LOCAL_P (decl
))
8176 atex_node
= get_thread_atexit_node ();
8178 atex_node
= get_atexit_node ();
8182 /* We must convert CLEANUP to the type that "__cxa_atexit"
8184 cleanup
= build_nop (get_atexit_fn_ptr_type (), cleanup
);
8185 /* "__cxa_atexit" will pass the address of DECL to the
8186 cleanup function. */
8188 addr
= build_address (decl
);
8189 /* The declared type of the parameter to "__cxa_atexit" is
8190 "void *". For plain "T*", we could just let the
8191 machinery in cp_build_function_call convert it -- but if the
8192 type is "cv-qualified T *", then we need to convert it
8193 before passing it in, to avoid spurious errors. */
8194 addr
= build_nop (ptr_type_node
, addr
);
8197 /* Since the cleanup functions we build ignore the address
8198 they're given, there's no reason to pass the actual address
8199 in, and, in general, it's cheaper to pass NULL than any
8201 addr
= null_pointer_node
;
8204 arg2
= cp_build_addr_expr (get_dso_handle_node (),
8205 tf_warning_or_error
);
8207 /* Just pass NULL to the dso handle parm if we don't actually
8208 have a DSO handle on this target. */
8209 arg2
= null_pointer_node
;
8215 if (!CP_DECL_THREAD_LOCAL_P (decl
)
8216 && targetm
.cxx
.use_aeabi_atexit ())
8232 return cp_build_function_call_nary (atex_node
, tf_warning_or_error
,
8233 arg0
, arg1
, arg2
, NULL_TREE
);
8236 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
8237 is its initializer. Generate code to handle the construction
8238 and destruction of DECL. */
8241 expand_static_init (tree decl
, tree init
)
8243 gcc_assert (VAR_P (decl
));
8244 gcc_assert (TREE_STATIC (decl
));
8246 /* Some variables require no dynamic initialization. */
8247 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl
)))
8249 /* Make sure the destructor is callable. */
8250 cxx_maybe_build_cleanup (decl
, tf_warning_or_error
);
8255 if (CP_DECL_THREAD_LOCAL_P (decl
) && DECL_GNU_TLS_P (decl
)
8256 && !DECL_FUNCTION_SCOPE_P (decl
))
8258 location_t dloc
= DECL_SOURCE_LOCATION (decl
);
8260 error_at (dloc
, "non-local variable %qD declared %<__thread%> "
8261 "needs dynamic initialization", decl
);
8263 error_at (dloc
, "non-local variable %qD declared %<__thread%> "
8264 "has a non-trivial destructor", decl
);
8265 static bool informed
;
8268 inform (dloc
, "C++11 %<thread_local%> allows dynamic "
8269 "initialization and destruction");
8275 if (DECL_FUNCTION_SCOPE_P (decl
))
8277 /* Emit code to perform this initialization but once. */
8278 tree if_stmt
= NULL_TREE
, inner_if_stmt
= NULL_TREE
;
8279 tree then_clause
= NULL_TREE
, inner_then_clause
= NULL_TREE
;
8280 tree guard
, guard_addr
;
8282 /* We don't need thread-safety code for thread-local vars. */
8283 bool thread_guard
= (flag_threadsafe_statics
8284 && !CP_DECL_THREAD_LOCAL_P (decl
));
8286 /* Emit code to perform this initialization but once. This code
8289 static <type> guard;
8290 if (!__atomic_load (guard.first_byte)) {
8291 if (__cxa_guard_acquire (&guard)) {
8294 // Do initialization.
8295 flag = true; __cxa_guard_release (&guard);
8296 // Register variable for destruction at end of program.
8298 if (!flag) __cxa_guard_abort (&guard);
8303 Note that the `flag' variable is only set to 1 *after* the
8304 initialization is complete. This ensures that an exception,
8305 thrown during the construction, will cause the variable to
8306 reinitialized when we pass through this code again, as per:
8310 If the initialization exits by throwing an exception, the
8311 initialization is not complete, so it will be tried again
8312 the next time control enters the declaration.
8314 This process should be thread-safe, too; multiple threads
8315 should not be able to initialize the variable more than
8318 /* Create the guard variable. */
8319 guard
= get_guard (decl
);
8321 /* Begin the conditional initialization. */
8322 if_stmt
= begin_if_stmt ();
8324 finish_if_stmt_cond (get_guard_cond (guard
, thread_guard
), if_stmt
);
8325 then_clause
= begin_compound_stmt (BCS_NO_SCOPE
);
8329 tree vfntype
= NULL_TREE
;
8330 tree acquire_name
, release_name
, abort_name
;
8331 tree acquire_fn
, release_fn
, abort_fn
;
8332 guard_addr
= build_address (guard
);
8334 acquire_name
= get_identifier ("__cxa_guard_acquire");
8335 release_name
= get_identifier ("__cxa_guard_release");
8336 abort_name
= get_identifier ("__cxa_guard_abort");
8337 acquire_fn
= get_global_binding (acquire_name
);
8338 release_fn
= get_global_binding (release_name
);
8339 abort_fn
= get_global_binding (abort_name
);
8341 acquire_fn
= push_library_fn
8342 (acquire_name
, build_function_type_list (integer_type_node
,
8343 TREE_TYPE (guard_addr
),
8345 NULL_TREE
, ECF_NOTHROW
| ECF_LEAF
);
8346 if (!release_fn
|| !abort_fn
)
8347 vfntype
= build_function_type_list (void_type_node
,
8348 TREE_TYPE (guard_addr
),
8351 release_fn
= push_library_fn (release_name
, vfntype
, NULL_TREE
,
8352 ECF_NOTHROW
| ECF_LEAF
);
8354 abort_fn
= push_library_fn (abort_name
, vfntype
, NULL_TREE
,
8355 ECF_NOTHROW
| ECF_LEAF
);
8357 inner_if_stmt
= begin_if_stmt ();
8358 finish_if_stmt_cond (build_call_n (acquire_fn
, 1, guard_addr
),
8361 inner_then_clause
= begin_compound_stmt (BCS_NO_SCOPE
);
8362 begin
= get_target_expr (boolean_false_node
);
8363 flag
= TARGET_EXPR_SLOT (begin
);
8365 TARGET_EXPR_CLEANUP (begin
)
8366 = build3 (COND_EXPR
, void_type_node
, flag
,
8368 build_call_n (abort_fn
, 1, guard_addr
));
8369 CLEANUP_EH_ONLY (begin
) = 1;
8371 /* Do the initialization itself. */
8372 init
= add_stmt_to_compound (begin
, init
);
8373 init
= add_stmt_to_compound
8374 (init
, build2 (MODIFY_EXPR
, void_type_node
, flag
, boolean_true_node
));
8375 init
= add_stmt_to_compound
8376 (init
, build_call_n (release_fn
, 1, guard_addr
));
8379 init
= add_stmt_to_compound (init
, set_guard (guard
));
8381 /* Use atexit to register a function for destroying this static
8383 init
= add_stmt_to_compound (init
, register_dtor_fn (decl
));
8385 finish_expr_stmt (init
);
8389 finish_compound_stmt (inner_then_clause
);
8390 finish_then_clause (inner_if_stmt
);
8391 finish_if_stmt (inner_if_stmt
);
8394 finish_compound_stmt (then_clause
);
8395 finish_then_clause (if_stmt
);
8396 finish_if_stmt (if_stmt
);
8398 else if (CP_DECL_THREAD_LOCAL_P (decl
))
8399 tls_aggregates
= tree_cons (init
, decl
, tls_aggregates
);
8401 static_aggregates
= tree_cons (init
, decl
, static_aggregates
);
8405 /* Make TYPE a complete type based on INITIAL_VALUE.
8406 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
8407 2 if there was no information (in which case assume 0 if DO_DEFAULT),
8408 3 if the initializer list is empty (in pedantic mode). */
8411 cp_complete_array_type (tree
*ptype
, tree initial_value
, bool do_default
)
8414 tree type
, elt_type
;
8416 /* Don't get confused by a CONSTRUCTOR for some other type. */
8417 if (initial_value
&& TREE_CODE (initial_value
) == CONSTRUCTOR
8418 && !BRACE_ENCLOSED_INITIALIZER_P (initial_value
)
8419 && TREE_CODE (TREE_TYPE (initial_value
)) != ARRAY_TYPE
)
8424 unsigned HOST_WIDE_INT i
;
8427 /* An array of character type can be initialized from a
8428 brace-enclosed string constant.
8430 FIXME: this code is duplicated from reshape_init. Probably
8431 we should just call reshape_init here? */
8432 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype
)))
8433 && TREE_CODE (initial_value
) == CONSTRUCTOR
8434 && !vec_safe_is_empty (CONSTRUCTOR_ELTS (initial_value
)))
8436 vec
<constructor_elt
, va_gc
> *v
= CONSTRUCTOR_ELTS (initial_value
);
8437 tree value
= (*v
)[0].value
;
8438 STRIP_ANY_LOCATION_WRAPPER (value
);
8440 if (TREE_CODE (value
) == STRING_CST
8441 && v
->length () == 1)
8442 initial_value
= value
;
8445 /* If any of the elements are parameter packs, we can't actually
8446 complete this type now because the array size is dependent. */
8447 if (TREE_CODE (initial_value
) == CONSTRUCTOR
)
8449 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value
),
8452 if (PACK_EXPANSION_P (value
))
8458 failure
= complete_array_type (ptype
, initial_value
, do_default
);
8460 /* We can create the array before the element type is complete, which
8461 means that we didn't have these two bits set in the original type
8462 either. In completing the type, we are expected to propagate these
8463 bits. See also complete_type which does the same thing for arrays
8466 if (type
!= error_mark_node
&& TYPE_DOMAIN (type
))
8468 elt_type
= TREE_TYPE (type
);
8469 TYPE_NEEDS_CONSTRUCTING (type
) = TYPE_NEEDS_CONSTRUCTING (elt_type
);
8470 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
)
8471 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type
);
8477 /* As above, but either give an error or reject zero-size arrays, depending
8481 cp_complete_array_type_or_error (tree
*ptype
, tree initial_value
,
8482 bool do_default
, tsubst_flags_t complain
)
8485 bool sfinae
= !(complain
& tf_error
);
8486 /* In SFINAE context we can't be lenient about zero-size arrays. */
8489 failure
= cp_complete_array_type (ptype
, initial_value
, do_default
);
8495 /* Not an error. */;
8496 else if (failure
== 1)
8497 error ("initializer fails to determine size of %qT", *ptype
);
8498 else if (failure
== 2)
8501 error ("array size missing in %qT", *ptype
);
8503 else if (failure
== 3)
8504 error ("zero-size array %qT", *ptype
);
8505 *ptype
= error_mark_node
;
8510 /* Return zero if something is declared to be a member of type
8511 CTYPE when in the context of CUR_TYPE. STRING is the error
8512 message to print in that case. Otherwise, quietly return 1. */
8515 member_function_or_else (tree ctype
, tree cur_type
, enum overload_flags flags
)
8517 if (ctype
&& ctype
!= cur_type
)
8519 if (flags
== DTOR_FLAG
)
8520 error ("destructor for alien class %qT cannot be a member", ctype
);
8522 error ("constructor for alien class %qT cannot be a member", ctype
);
8528 /* Subroutine of `grokdeclarator'. */
8530 /* Generate errors possibly applicable for a given set of specifiers.
8531 This is for ARM $7.1.2. */
8534 bad_specifiers (tree object
,
8535 enum bad_spec_place type
,
8541 const location_t
* locations
)
8547 error_at (locations
[ds_virtual
],
8548 "%qD declared as a %<virtual%> variable", object
);
8550 error ("%<const%> and %<volatile%> function specifiers on "
8551 "%qD invalid in variable declaration", object
);
8555 error_at (locations
[ds_virtual
],
8556 "%qD declared as a %<virtual%> parameter", object
);
8558 error_at (locations
[ds_inline
],
8559 "%qD declared as an %<inline%> parameter", object
);
8561 error ("%<const%> and %<volatile%> function specifiers on "
8562 "%qD invalid in parameter declaration", object
);
8566 error_at (locations
[ds_virtual
],
8567 "%qD declared as a %<virtual%> type", object
);
8569 error_at (locations
[ds_inline
],
8570 "%qD declared as an %<inline%> type", object
);
8572 error ("%<const%> and %<volatile%> function specifiers on "
8573 "%qD invalid in type declaration", object
);
8577 error_at (locations
[ds_virtual
],
8578 "%qD declared as a %<virtual%> field", object
);
8580 error_at (locations
[ds_inline
],
8581 "%qD declared as an %<inline%> field", object
);
8583 error ("%<const%> and %<volatile%> function specifiers on "
8584 "%qD invalid in field declaration", object
);
8590 error ("%q+D declared as a friend", object
);
8592 && !flag_noexcept_type
8593 && (TREE_CODE (object
) == TYPE_DECL
8594 || (!TYPE_PTRFN_P (TREE_TYPE (object
))
8595 && !TYPE_REFFN_P (TREE_TYPE (object
))
8596 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object
)))))
8597 error ("%q+D declared with an exception specification", object
);
8600 /* DECL is a member function or static data member and is presently
8601 being defined. Check that the definition is taking place in a
8605 check_class_member_definition_namespace (tree decl
)
8607 /* These checks only apply to member functions and static data
8609 gcc_assert (VAR_OR_FUNCTION_DECL_P (decl
));
8610 /* We check for problems with specializations in pt.c in
8611 check_specialization_namespace, where we can issue better
8613 if (processing_specialization
)
8615 /* We check this in check_explicit_instantiation_namespace. */
8616 if (processing_explicit_instantiation
)
8620 A member function definition that appears outside of the
8621 class definition shall appear in a namespace scope enclosing
8622 the class definition.
8626 The definition for a static data member shall appear in a
8627 namespace scope enclosing the member's class definition. */
8628 if (!is_ancestor (current_namespace
, DECL_CONTEXT (decl
)))
8629 permerror (input_location
, "definition of %qD is not in namespace enclosing %qT",
8630 decl
, DECL_CONTEXT (decl
));
8633 /* Build a PARM_DECL for the "this" parameter of FN. TYPE is the
8634 METHOD_TYPE for a non-static member function; QUALS are the
8635 cv-qualifiers that apply to the function. */
8638 build_this_parm (tree fn
, tree type
, cp_cv_quals quals
)
8643 cp_cv_quals this_quals
;
8645 if (CLASS_TYPE_P (type
))
8648 = cp_build_qualified_type (type
, quals
& ~TYPE_QUAL_RESTRICT
);
8649 this_type
= build_pointer_type (this_type
);
8652 this_type
= type_of_this_parm (type
);
8653 /* The `this' parameter is implicitly `const'; it cannot be
8655 this_quals
= (quals
& TYPE_QUAL_RESTRICT
) | TYPE_QUAL_CONST
;
8656 qual_type
= cp_build_qualified_type (this_type
, this_quals
);
8657 parm
= build_artificial_parm (fn
, this_identifier
, qual_type
);
8658 cp_apply_type_quals_to_decl (this_quals
, parm
);
8662 /* DECL is a static member function. Complain if it was declared
8663 with function-cv-quals. */
8666 check_static_quals (tree decl
, cp_cv_quals quals
)
8668 if (quals
!= TYPE_UNQUALIFIED
)
8669 error ("static member function %q#D declared with type qualifiers",
8673 // Check that FN takes no arguments and returns bool.
8675 check_concept_fn (tree fn
)
8677 // A constraint is nullary.
8678 if (DECL_ARGUMENTS (fn
))
8679 error_at (DECL_SOURCE_LOCATION (fn
),
8680 "concept %q#D declared with function parameters", fn
);
8682 // The declared return type of the concept shall be bool, and
8683 // it shall not be deduced from it definition.
8684 tree type
= TREE_TYPE (TREE_TYPE (fn
));
8686 error_at (DECL_SOURCE_LOCATION (fn
),
8687 "concept %q#D declared with a deduced return type", fn
);
8688 else if (type
!= boolean_type_node
)
8689 error_at (DECL_SOURCE_LOCATION (fn
),
8690 "concept %q#D with non-%<bool%> return type %qT", fn
, type
);
8693 /* Helper function. Replace the temporary this parameter injected
8694 during cp_finish_omp_declare_simd with the real this parameter. */
8697 declare_simd_adjust_this (tree
*tp
, int *walk_subtrees
, void *data
)
8699 tree this_parm
= (tree
) data
;
8700 if (TREE_CODE (*tp
) == PARM_DECL
8701 && DECL_NAME (*tp
) == this_identifier
8702 && *tp
!= this_parm
)
8704 else if (TYPE_P (*tp
))
8709 /* CTYPE is class type, or null if non-class.
8710 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
8712 DECLARATOR is the function's name.
8713 PARMS is a chain of PARM_DECLs for the function.
8714 VIRTUALP is truthvalue of whether the function is virtual or not.
8715 FLAGS are to be passed through to `grokclassfn'.
8716 QUALS are qualifiers indicating whether the function is `const'
8718 RAISES is a list of exceptions that this function can raise.
8719 CHECK is 1 if we must find this method in CTYPE, 0 if we should
8720 not look, and -1 if we should not call `grokclassfn' at all.
8722 SFK is the kind of special function (if any) for the new function.
8724 Returns `NULL_TREE' if something goes wrong, after issuing
8725 applicable error messages. */
8728 grokfndecl (tree ctype
,
8732 tree orig_declarator
,
8733 const cp_decl_specifier_seq
*declspecs
,
8736 enum overload_flags flags
,
8738 cp_ref_qualifier rqual
,
8745 special_function_kind sfk
,
8747 bool late_return_type_p
,
8751 location_t location
)
8754 int staticp
= ctype
&& TREE_CODE (type
) == FUNCTION_TYPE
;
8757 if (location
== UNKNOWN_LOCATION
)
8758 location
= input_location
;
8760 // Was the concept specifier present?
8761 bool concept_p
= inlinep
& 4;
8763 // Concept declarations must have a corresponding definition.
8764 if (concept_p
&& !funcdef_flag
)
8766 error_at (location
, "concept %qD has no definition", declarator
);
8770 type
= build_cp_fntype_variant (type
, rqual
, raises
, late_return_type_p
);
8772 decl
= build_lang_decl_loc (location
, FUNCTION_DECL
, declarator
, type
);
8774 /* Set the constraints on the declaration. */
8777 tree tmpl_reqs
= NULL_TREE
;
8778 if (processing_template_decl
> template_class_depth (ctype
))
8779 tmpl_reqs
= TEMPLATE_PARMS_CONSTRAINTS (current_template_parms
);
8781 /* Adjust the required expression into a constraint. */
8783 decl_reqs
= normalize_expression (decl_reqs
);
8785 tree ci
= build_constraints (tmpl_reqs
, decl_reqs
);
8786 set_constraints (decl
, ci
);
8789 if (TREE_CODE (type
) == METHOD_TYPE
)
8791 tree parm
= build_this_parm (decl
, type
, quals
);
8792 DECL_CHAIN (parm
) = parms
;
8795 /* Allocate space to hold the vptr bit if needed. */
8796 SET_DECL_ALIGN (decl
, MINIMUM_METHOD_BOUNDARY
);
8799 DECL_ARGUMENTS (decl
) = parms
;
8800 for (t
= parms
; t
; t
= DECL_CHAIN (t
))
8801 DECL_CONTEXT (t
) = decl
;
8803 /* Propagate volatile out from type to decl. */
8804 if (TYPE_VOLATILE (type
))
8805 TREE_THIS_VOLATILE (decl
) = 1;
8807 /* Setup decl according to sfk. */
8810 case sfk_constructor
:
8811 case sfk_copy_constructor
:
8812 case sfk_move_constructor
:
8813 DECL_CXX_CONSTRUCTOR_P (decl
) = 1;
8814 DECL_NAME (decl
) = ctor_identifier
;
8816 case sfk_destructor
:
8817 DECL_CXX_DESTRUCTOR_P (decl
) = 1;
8818 DECL_NAME (decl
) = dtor_identifier
;
8824 if (friendp
&& TREE_CODE (orig_declarator
) == TEMPLATE_ID_EXPR
)
8828 "defining explicit specialization %qD in friend declaration",
8832 tree fns
= TREE_OPERAND (orig_declarator
, 0);
8833 tree args
= TREE_OPERAND (orig_declarator
, 1);
8835 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
8837 /* Something like `template <class T> friend void f<T>()'. */
8839 "invalid use of template-id %qD in declaration "
8840 "of primary template",
8846 /* A friend declaration of the form friend void f<>(). Record
8847 the information in the TEMPLATE_ID_EXPR. */
8848 SET_DECL_IMPLICIT_INSTANTIATION (decl
);
8850 gcc_assert (identifier_p (fns
)
8851 || TREE_CODE (fns
) == OVERLOAD
8852 || TREE_CODE (fns
) == FUNCTION_DECL
);
8853 DECL_TEMPLATE_INFO (decl
) = build_template_info (fns
, args
);
8855 for (t
= TYPE_ARG_TYPES (TREE_TYPE (decl
)); t
; t
= TREE_CHAIN (t
))
8856 if (TREE_PURPOSE (t
)
8857 && TREE_CODE (TREE_PURPOSE (t
)) == DEFAULT_ARG
)
8859 error_at (defarg_location (TREE_PURPOSE (t
)),
8860 "default arguments are not allowed in declaration "
8861 "of friend template specialization %qD",
8868 error_at (declspecs
->locations
[ds_inline
],
8869 "%<inline%> is not allowed in declaration of friend "
8870 "template specialization %qD",
8877 /* C++17 11.3.6/4: "If a friend declaration specifies a default argument
8878 expression, that declaration shall be a definition..." */
8879 if (friendp
&& !funcdef_flag
)
8881 for (tree t
= FUNCTION_FIRST_USER_PARMTYPE (decl
);
8882 t
&& t
!= void_list_node
; t
= TREE_CHAIN (t
))
8883 if (TREE_PURPOSE (t
))
8885 permerror (DECL_SOURCE_LOCATION (decl
),
8886 "friend declaration of %qD specifies default "
8887 "arguments and isn't a definition", decl
);
8892 /* If this decl has namespace scope, set that up. */
8894 set_decl_namespace (decl
, in_namespace
, friendp
);
8896 DECL_CONTEXT (decl
) = FROB_CONTEXT (current_decl_namespace ());
8898 /* `main' and builtins have implicit 'C' linkage. */
8899 if (ctype
== NULL_TREE
8900 && DECL_FILE_SCOPE_P (decl
)
8901 && current_lang_name
== lang_name_cplusplus
8902 && (MAIN_NAME_P (declarator
)
8903 || (IDENTIFIER_LENGTH (declarator
) > 10
8904 && IDENTIFIER_POINTER (declarator
)[0] == '_'
8905 && IDENTIFIER_POINTER (declarator
)[1] == '_'
8906 && strncmp (IDENTIFIER_POINTER (declarator
)+2,
8907 "builtin_", 8) == 0)
8908 || (targetcm
.cxx_implicit_extern_c
8909 && (targetcm
.cxx_implicit_extern_c
8910 (IDENTIFIER_POINTER (declarator
))))))
8911 SET_DECL_LANGUAGE (decl
, lang_c
);
8913 /* Should probably propagate const out from type to decl I bet (mrs). */
8916 DECL_STATIC_FUNCTION_P (decl
) = 1;
8917 DECL_CONTEXT (decl
) = ctype
;
8921 DECL_DELETED_FN (decl
) = 1;
8925 DECL_CONTEXT (decl
) = ctype
;
8927 check_class_member_definition_namespace (decl
);
8930 if (ctype
== NULL_TREE
&& DECL_MAIN_P (decl
))
8932 if (PROCESSING_REAL_TEMPLATE_DECL_P())
8933 error_at (location
, "cannot declare %<::main%> to be a template");
8935 error_at (declspecs
->locations
[ds_inline
],
8936 "cannot declare %<::main%> to be inline");
8938 error_at (declspecs
->locations
[ds_constexpr
],
8939 "cannot declare %<::main%> to be %<constexpr%>");
8941 error_at (location
, "cannot declare %<::main%> to be static");
8946 /* Members of anonymous types and local classes have no linkage; make
8947 them internal. If a typedef is made later, this will be changed. */
8948 if (ctype
&& (!TREE_PUBLIC (TYPE_MAIN_DECL (ctype
))
8949 || decl_function_context (TYPE_MAIN_DECL (ctype
))))
8952 if (publicp
&& cxx_dialect
== cxx98
)
8954 /* [basic.link]: A name with no linkage (notably, the name of a class
8955 or enumeration declared in a local scope) shall not be used to
8956 declare an entity with linkage.
8958 DR 757 relaxes this restriction for C++0x. */
8959 no_linkage_error (decl
);
8962 TREE_PUBLIC (decl
) = publicp
;
8965 DECL_INTERFACE_KNOWN (decl
) = 1;
8966 DECL_NOT_REALLY_EXTERN (decl
) = 1;
8969 /* If the declaration was declared inline, mark it as such. */
8972 DECL_DECLARED_INLINE_P (decl
) = 1;
8974 DECL_COMDAT (decl
) = 1;
8977 DECL_DECLARED_CONSTEXPR_P (decl
) = true;
8979 // If the concept declaration specifier was found, check
8980 // that the declaration satisfies the necessary requirements.
8983 DECL_DECLARED_CONCEPT_P (decl
) = true;
8984 check_concept_fn (decl
);
8987 DECL_EXTERNAL (decl
) = 1;
8988 if (TREE_CODE (type
) == FUNCTION_TYPE
)
8991 TREE_TYPE (decl
) = apply_memfn_quals (TREE_TYPE (decl
),
8998 ? G_("static member function %qD cannot have cv-qualifier")
8999 : G_("non-member function %qD cannot have cv-qualifier"),
9001 quals
= TYPE_UNQUALIFIED
;
9007 ? G_("static member function %qD cannot have ref-qualifier")
9008 : G_("non-member function %qD cannot have ref-qualifier"),
9010 rqual
= REF_QUAL_NONE
;
9014 if (deduction_guide_p (decl
))
9016 if (!DECL_NAMESPACE_SCOPE_P (decl
))
9018 error_at (location
, "deduction guide %qD must be declared at "
9019 "namespace scope", decl
);
9024 "deduction guide %qD must not have a function body", decl
);
9026 else if (IDENTIFIER_ANY_OP_P (DECL_NAME (decl
))
9027 && !grok_op_properties (decl
, /*complain=*/true))
9029 else if (UDLIT_OPER_P (DECL_NAME (decl
)))
9031 bool long_long_unsigned_p
;
9033 const char *suffix
= NULL
;
9034 /* [over.literal]/6: Literal operators shall not have C linkage. */
9035 if (DECL_LANGUAGE (decl
) == lang_c
)
9037 error_at (location
, "literal operator with C linkage");
9038 maybe_show_extern_c_location ();
9042 if (DECL_NAMESPACE_SCOPE_P (decl
))
9044 if (!check_literal_operator_args (decl
, &long_long_unsigned_p
,
9047 error_at (location
, "%qD has invalid argument list", decl
);
9051 suffix
= UDLIT_OP_SUFFIX (DECL_NAME (decl
));
9052 if (long_long_unsigned_p
)
9054 if (cpp_interpret_int_suffix (parse_in
, suffix
, strlen (suffix
)))
9055 warning_at (location
, 0, "integer suffix %qs"
9056 " shadowed by implementation", suffix
);
9058 else if (long_double_p
)
9060 if (cpp_interpret_float_suffix (parse_in
, suffix
, strlen (suffix
)))
9061 warning_at (location
, 0, "floating point suffix %qs"
9062 " shadowed by implementation", suffix
);
9065 if (suffix
[0] != '_'
9066 && !in_system_header_at (location
)
9067 && !current_function_decl
&& !(friendp
&& !funcdef_flag
))
9068 warning_at (location
, OPT_Wliteral_suffix
,
9069 "literal operator suffixes not preceded by %<_%>"
9070 " are reserved for future standardization");
9074 error_at (location
, "%qD must be a non-member function", decl
);
9080 /* Make the init_value nonzero so pushdecl knows this is not
9081 tentative. error_mark_node is replaced later with the BLOCK. */
9082 DECL_INITIAL (decl
) = error_mark_node
;
9084 if (TYPE_NOTHROW_P (type
) || nothrow_libfn_p (decl
))
9085 TREE_NOTHROW (decl
) = 1;
9087 if (flag_openmp
|| flag_openmp_simd
)
9089 /* Adjust "omp declare simd" attributes. */
9090 tree ods
= lookup_attribute ("omp declare simd", *attrlist
);
9094 for (attr
= ods
; attr
;
9095 attr
= lookup_attribute ("omp declare simd", TREE_CHAIN (attr
)))
9097 if (TREE_CODE (type
) == METHOD_TYPE
)
9098 walk_tree (&TREE_VALUE (attr
), declare_simd_adjust_this
,
9099 DECL_ARGUMENTS (decl
), NULL
);
9100 if (TREE_VALUE (attr
) != NULL_TREE
)
9102 tree cl
= TREE_VALUE (TREE_VALUE (attr
));
9103 cl
= c_omp_declare_simd_clauses_to_numbers
9104 (DECL_ARGUMENTS (decl
), cl
);
9106 TREE_VALUE (TREE_VALUE (attr
)) = cl
;
9108 TREE_VALUE (attr
) = NULL_TREE
;
9114 /* Caller will do the rest of this. */
9118 if (ctype
!= NULL_TREE
)
9119 grokclassfn (ctype
, decl
, flags
);
9122 if (cxx_dialect
>= cxx11
9123 && DECL_DESTRUCTOR_P (decl
)
9124 && !TYPE_BEING_DEFINED (DECL_CONTEXT (decl
))
9125 && !processing_template_decl
)
9126 deduce_noexcept_on_destructor (decl
);
9128 decl
= check_explicit_specialization (orig_declarator
, decl
,
9131 4 * (friendp
!= 0) +
9134 if (decl
== error_mark_node
)
9137 if (DECL_STATIC_FUNCTION_P (decl
))
9138 check_static_quals (decl
, quals
);
9142 cplus_decl_attributes (&decl
, *attrlist
, 0);
9143 *attrlist
= NULL_TREE
;
9146 /* Check main's type after attributes have been applied. */
9147 if (ctype
== NULL_TREE
&& DECL_MAIN_P (decl
))
9149 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl
)),
9152 tree oldtypeargs
= TYPE_ARG_TYPES (TREE_TYPE (decl
));
9154 error_at (declspecs
->locations
[ds_type_spec
],
9155 "%<::main%> must return %<int%>");
9156 newtype
= build_function_type (integer_type_node
, oldtypeargs
);
9157 TREE_TYPE (decl
) = newtype
;
9160 check_main_parameter_types (decl
);
9163 if (ctype
!= NULL_TREE
&& check
)
9165 tree old_decl
= check_classfn (ctype
, decl
,
9166 (processing_template_decl
9167 > template_class_depth (ctype
))
9168 ? current_template_parms
9171 if (old_decl
== error_mark_node
)
9179 if (TREE_CODE (old_decl
) == TEMPLATE_DECL
)
9180 /* Because grokfndecl is always supposed to return a
9181 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
9182 here. We depend on our callers to figure out that its
9183 really a template that's being returned. */
9184 old_decl
= DECL_TEMPLATE_RESULT (old_decl
);
9186 if (DECL_STATIC_FUNCTION_P (old_decl
)
9187 && TREE_CODE (TREE_TYPE (decl
)) == METHOD_TYPE
)
9189 /* Remove the `this' parm added by grokclassfn. */
9190 revert_static_member_fn (decl
);
9191 check_static_quals (decl
, quals
);
9193 if (DECL_ARTIFICIAL (old_decl
))
9195 error ("definition of implicitly-declared %qD", old_decl
);
9198 else if (DECL_DEFAULTED_FN (old_decl
))
9200 error ("definition of explicitly-defaulted %q+D", decl
);
9201 inform (DECL_SOURCE_LOCATION (old_decl
),
9202 "%q#D explicitly defaulted here", old_decl
);
9206 /* Since we've smashed OLD_DECL to its
9207 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
9208 if (TREE_CODE (decl
) == TEMPLATE_DECL
)
9209 decl
= DECL_TEMPLATE_RESULT (decl
);
9211 /* Attempt to merge the declarations. This can fail, in
9212 the case of some invalid specialization declarations. */
9213 pushed_scope
= push_scope (ctype
);
9214 ok
= duplicate_decls (decl
, old_decl
, friendp
);
9216 pop_scope (pushed_scope
);
9219 error ("no %q#D member function declared in class %qT",
9223 if (ok
== error_mark_node
)
9229 if (DECL_CONSTRUCTOR_P (decl
) && !grok_ctor_properties (ctype
, decl
))
9232 if (ctype
== NULL_TREE
|| check
)
9236 DECL_VIRTUAL_P (decl
) = 1;
9241 /* decl is a FUNCTION_DECL.
9242 specifiers are the parsed virt-specifiers.
9244 Set flags to reflect the virt-specifiers.
9249 set_virt_specifiers (tree decl
, cp_virt_specifiers specifiers
)
9251 if (decl
== NULL_TREE
)
9253 if (specifiers
& VIRT_SPEC_OVERRIDE
)
9254 DECL_OVERRIDE_P (decl
) = 1;
9255 if (specifiers
& VIRT_SPEC_FINAL
)
9256 DECL_FINAL_P (decl
) = 1;
9260 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
9261 the linkage that DECL will receive in the object file. */
9264 set_linkage_for_static_data_member (tree decl
)
9266 /* A static data member always has static storage duration and
9267 external linkage. Note that static data members are forbidden in
9268 local classes -- the only situation in which a class has
9269 non-external linkage. */
9270 TREE_PUBLIC (decl
) = 1;
9271 TREE_STATIC (decl
) = 1;
9272 /* For non-template classes, static data members are always put
9273 out in exactly those files where they are defined, just as
9274 with ordinary namespace-scope variables. */
9275 if (!processing_template_decl
)
9276 DECL_INTERFACE_KNOWN (decl
) = 1;
9279 /* Create a VAR_DECL named NAME with the indicated TYPE.
9281 If SCOPE is non-NULL, it is the class type or namespace containing
9282 the variable. If SCOPE is NULL, the variable should is created in
9283 the innermost enclosing scope. */
9286 grokvardecl (tree type
,
9288 tree orig_declarator
,
9289 const cp_decl_specifier_seq
*declspecs
,
9296 location_t location
)
9299 tree explicit_scope
;
9301 gcc_assert (!name
|| identifier_p (name
));
9303 bool constp
= (type_quals
& TYPE_QUAL_CONST
) != 0;
9304 bool volatilep
= (type_quals
& TYPE_QUAL_VOLATILE
) != 0;
9306 /* Compute the scope in which to place the variable, but remember
9307 whether or not that scope was explicitly specified by the user. */
9308 explicit_scope
= scope
;
9311 /* An explicit "extern" specifier indicates a namespace-scope
9313 if (declspecs
->storage_class
== sc_extern
)
9314 scope
= current_decl_namespace ();
9315 else if (!at_function_scope_p ())
9316 scope
= current_scope ();
9320 && (/* If the variable is a namespace-scope variable declared in a
9321 template, we need DECL_LANG_SPECIFIC. */
9322 (TREE_CODE (scope
) == NAMESPACE_DECL
&& processing_template_decl
)
9323 /* Similarly for namespace-scope variables with language linkage
9325 || (TREE_CODE (scope
) == NAMESPACE_DECL
9326 && current_lang_name
!= lang_name_cplusplus
)
9327 /* Similarly for static data members. */
9329 /* Similarly for explicit specializations. */
9331 && TREE_CODE (orig_declarator
) == TEMPLATE_ID_EXPR
)))
9332 decl
= build_lang_decl_loc (location
, VAR_DECL
, name
, type
);
9334 decl
= build_decl (location
, VAR_DECL
, name
, type
);
9336 if (explicit_scope
&& TREE_CODE (explicit_scope
) == NAMESPACE_DECL
)
9337 set_decl_namespace (decl
, explicit_scope
, 0);
9339 DECL_CONTEXT (decl
) = FROB_CONTEXT (scope
);
9341 if (declspecs
->storage_class
== sc_extern
)
9343 DECL_THIS_EXTERN (decl
) = 1;
9344 DECL_EXTERNAL (decl
) = !initialized
;
9347 if (DECL_CLASS_SCOPE_P (decl
))
9349 set_linkage_for_static_data_member (decl
);
9350 /* This function is only called with out-of-class definitions. */
9351 DECL_EXTERNAL (decl
) = 0;
9352 check_class_member_definition_namespace (decl
);
9354 /* At top level, either `static' or no s.c. makes a definition
9355 (perhaps tentative), and absence of `static' makes it public. */
9356 else if (toplevel_bindings_p ())
9358 TREE_PUBLIC (decl
) = (declspecs
->storage_class
!= sc_static
9359 && (DECL_THIS_EXTERN (decl
)
9363 TREE_STATIC (decl
) = ! DECL_EXTERNAL (decl
);
9365 /* Not at top level, only `static' makes a static definition. */
9368 TREE_STATIC (decl
) = declspecs
->storage_class
== sc_static
;
9369 TREE_PUBLIC (decl
) = DECL_EXTERNAL (decl
);
9372 if (decl_spec_seq_has_spec_p (declspecs
, ds_thread
))
9374 if (DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
9376 CP_DECL_THREAD_LOCAL_P (decl
) = true;
9377 if (!processing_template_decl
)
9378 set_decl_tls_model (decl
, decl_default_tls_model (decl
));
9380 if (declspecs
->gnu_thread_keyword_p
)
9381 SET_DECL_GNU_TLS_P (decl
);
9384 /* If the type of the decl has no linkage, make sure that we'll
9385 notice that in mark_used. */
9386 if (cxx_dialect
> cxx98
9387 && decl_linkage (decl
) != lk_none
9388 && DECL_LANG_SPECIFIC (decl
) == NULL
9389 && !DECL_EXTERN_C_P (decl
)
9390 && no_linkage_check (TREE_TYPE (decl
), /*relaxed_p=*/false))
9391 retrofit_lang_decl (decl
);
9393 if (TREE_PUBLIC (decl
))
9395 /* [basic.link]: A name with no linkage (notably, the name of a class
9396 or enumeration declared in a local scope) shall not be used to
9397 declare an entity with linkage.
9399 DR 757 relaxes this restriction for C++0x. */
9400 if (cxx_dialect
< cxx11
)
9401 no_linkage_error (decl
);
9404 DECL_INTERFACE_KNOWN (decl
) = 1;
9406 if (DECL_NAME (decl
)
9407 && MAIN_NAME_P (DECL_NAME (decl
))
9408 && scope
== global_namespace
)
9409 error ("cannot declare %<::main%> to be a global variable");
9411 /* Check that the variable can be safely declared as a concept.
9412 Note that this also forbids explicit specializations. */
9415 if (!processing_template_decl
)
9417 error_at (declspecs
->locations
[ds_concept
],
9418 "a non-template variable cannot be %<concept%>");
9422 DECL_DECLARED_CONCEPT_P (decl
) = true;
9423 if (!same_type_ignoring_top_level_qualifiers_p (type
, boolean_type_node
))
9424 error_at (declspecs
->locations
[ds_type_spec
],
9425 "concept must have type %<bool%>");
9427 else if (flag_concepts
9428 && processing_template_decl
> template_class_depth (scope
))
9430 tree reqs
= TEMPLATE_PARMS_CONSTRAINTS (current_template_parms
);
9431 tree ci
= build_constraints (reqs
, NULL_TREE
);
9432 set_constraints (decl
, ci
);
9435 // Handle explicit specializations and instantiations of variable templates.
9436 if (orig_declarator
)
9437 decl
= check_explicit_specialization (orig_declarator
, decl
,
9438 template_count
, conceptp
* 8);
9440 return decl
!= error_mark_node
? decl
: NULL_TREE
;
9443 /* Create and return a canonical pointer to member function type, for
9444 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
9447 build_ptrmemfunc_type (tree type
)
9452 if (type
== error_mark_node
)
9455 /* Make sure that we always have the unqualified pointer-to-member
9457 if (cp_cv_quals quals
= cp_type_quals (type
))
9459 tree unqual
= build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type
));
9460 return cp_build_qualified_type (unqual
, quals
);
9463 /* If a canonical type already exists for this type, use it. We use
9464 this method instead of type_hash_canon, because it only does a
9465 simple equality check on the list of field members. */
9467 t
= TYPE_PTRMEMFUNC_TYPE (type
);
9471 t
= make_node (RECORD_TYPE
);
9473 /* Let the front end know this is a pointer to member function. */
9474 TYPE_PTRMEMFUNC_FLAG (t
) = 1;
9476 field
= build_decl (input_location
, FIELD_DECL
, pfn_identifier
, type
);
9479 field
= build_decl (input_location
, FIELD_DECL
, delta_identifier
,
9481 DECL_CHAIN (field
) = fields
;
9484 finish_builtin_struct (t
, "__ptrmemfunc_type", fields
, ptr_type_node
);
9486 /* Zap out the name so that the back end will give us the debugging
9487 information for this anonymous RECORD_TYPE. */
9488 TYPE_NAME (t
) = NULL_TREE
;
9490 /* Cache this pointer-to-member type so that we can find it again
9492 TYPE_PTRMEMFUNC_TYPE (type
) = t
;
9494 if (TYPE_STRUCTURAL_EQUALITY_P (type
))
9495 SET_TYPE_STRUCTURAL_EQUALITY (t
);
9496 else if (TYPE_CANONICAL (type
) != type
)
9497 TYPE_CANONICAL (t
) = build_ptrmemfunc_type (TYPE_CANONICAL (type
));
9502 /* Create and return a pointer to data member type. */
9505 build_ptrmem_type (tree class_type
, tree member_type
)
9507 if (TREE_CODE (member_type
) == METHOD_TYPE
)
9509 cp_cv_quals quals
= type_memfn_quals (member_type
);
9510 cp_ref_qualifier rqual
= type_memfn_rqual (member_type
);
9511 member_type
= build_memfn_type (member_type
, class_type
, quals
, rqual
);
9512 return build_ptrmemfunc_type (build_pointer_type (member_type
));
9516 gcc_assert (TREE_CODE (member_type
) != FUNCTION_TYPE
);
9517 return build_offset_type (class_type
, member_type
);
9521 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
9522 Check to see that the definition is valid. Issue appropriate error
9526 check_static_variable_definition (tree decl
, tree type
)
9528 /* Avoid redundant diagnostics on out-of-class definitions. */
9529 if (!current_class_type
|| !TYPE_BEING_DEFINED (current_class_type
))
9531 /* Can't check yet if we don't know the type. */
9532 else if (dependent_type_p (type
))
9534 /* If DECL is declared constexpr, we'll do the appropriate checks
9535 in check_initializer. Similarly for inline static data members. */
9536 else if (DECL_P (decl
)
9537 && (DECL_DECLARED_CONSTEXPR_P (decl
)
9538 || undeduced_auto_decl (decl
)
9539 || DECL_VAR_DECLARED_INLINE_P (decl
)))
9541 else if (cxx_dialect
>= cxx11
&& !INTEGRAL_OR_ENUMERATION_TYPE_P (type
))
9543 if (!COMPLETE_TYPE_P (type
))
9544 error_at (DECL_SOURCE_LOCATION (decl
),
9545 "in-class initialization of static data member %q#D of "
9546 "incomplete type", decl
);
9547 else if (literal_type_p (type
))
9548 permerror (DECL_SOURCE_LOCATION (decl
),
9549 "%<constexpr%> needed for in-class initialization of "
9550 "static data member %q#D of non-integral type", decl
);
9552 error_at (DECL_SOURCE_LOCATION (decl
),
9553 "in-class initialization of static data member %q#D of "
9554 "non-literal type", decl
);
9556 /* Motion 10 at San Diego: If a static const integral data member is
9557 initialized with an integral constant expression, the initializer
9558 may appear either in the declaration (within the class), or in
9559 the definition, but not both. If it appears in the class, the
9560 member is a member constant. The file-scope definition is always
9562 else if (!ARITHMETIC_TYPE_P (type
) && TREE_CODE (type
) != ENUMERAL_TYPE
)
9563 error_at (DECL_SOURCE_LOCATION (decl
),
9564 "invalid in-class initialization of static data member "
9565 "of non-integral type %qT",
9567 else if (!CP_TYPE_CONST_P (type
))
9568 error_at (DECL_SOURCE_LOCATION (decl
),
9569 "ISO C++ forbids in-class initialization of non-const "
9570 "static member %qD",
9572 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type
))
9573 pedwarn (DECL_SOURCE_LOCATION (decl
), OPT_Wpedantic
,
9574 "ISO C++ forbids initialization of member constant "
9575 "%qD of non-integral type %qT", decl
, type
);
9578 /* *expr_p is part of the TYPE_SIZE of a variably-sized array. If any
9579 SAVE_EXPRs in *expr_p wrap expressions with side-effects, break those
9580 expressions out into temporary variables so that walk_tree doesn't
9581 step into them (c++/15764). */
9584 stabilize_save_expr_r (tree
*expr_p
, int *walk_subtrees
, void *data
)
9586 hash_set
<tree
> *pset
= (hash_set
<tree
> *)data
;
9587 tree expr
= *expr_p
;
9588 if (TREE_CODE (expr
) == SAVE_EXPR
)
9590 tree op
= TREE_OPERAND (expr
, 0);
9591 cp_walk_tree (&op
, stabilize_save_expr_r
, data
, pset
);
9592 if (TREE_SIDE_EFFECTS (op
))
9593 TREE_OPERAND (expr
, 0) = get_temp_regvar (TREE_TYPE (op
), op
);
9596 else if (!EXPR_P (expr
) || !TREE_SIDE_EFFECTS (expr
))
9601 /* Entry point for the above. */
9604 stabilize_vla_size (tree size
)
9606 hash_set
<tree
> pset
;
9607 /* Break out any function calls into temporary variables. */
9608 cp_walk_tree (&size
, stabilize_save_expr_r
, &pset
, &pset
);
9611 /* Reduce a SIZEOF_EXPR to its value. */
9614 fold_sizeof_expr (tree t
)
9617 if (SIZEOF_EXPR_TYPE_P (t
))
9618 r
= cxx_sizeof_or_alignof_type (TREE_TYPE (TREE_OPERAND (t
, 0)),
9619 SIZEOF_EXPR
, false, false);
9620 else if (TYPE_P (TREE_OPERAND (t
, 0)))
9621 r
= cxx_sizeof_or_alignof_type (TREE_OPERAND (t
, 0), SIZEOF_EXPR
,
9624 r
= cxx_sizeof_or_alignof_expr (TREE_OPERAND (t
, 0), SIZEOF_EXPR
,
9626 if (r
== error_mark_node
)
9631 /* Given the SIZE (i.e., number of elements) in an array, compute
9632 an appropriate index type for the array. If non-NULL, NAME is
9633 the name of the entity being declared. */
9636 compute_array_index_type_loc (location_t name_loc
, tree name
, tree size
,
9637 tsubst_flags_t complain
)
9642 if (error_operand_p (size
))
9643 return error_mark_node
;
9645 location_t loc
= cp_expr_loc_or_loc (size
, name
? name_loc
: input_location
);
9647 if (!type_dependent_expression_p (size
))
9649 osize
= size
= mark_rvalue_use (size
);
9651 if (cxx_dialect
< cxx11
&& TREE_CODE (size
) == NOP_EXPR
9652 && TREE_SIDE_EFFECTS (size
))
9653 /* In C++98, we mark a non-constant array bound with a magic
9654 NOP_EXPR with TREE_SIDE_EFFECTS; don't fold in that case. */;
9657 size
= instantiate_non_dependent_expr_sfinae (size
, complain
);
9658 size
= build_converted_constant_expr (size_type_node
, size
, complain
);
9659 /* Pedantically a constant expression is required here and so
9660 __builtin_is_constant_evaluated () should fold to true if it
9661 is successfully folded into a constant. */
9662 size
= maybe_constant_value (size
, NULL_TREE
,
9663 /*manifestly_const_eval=*/true);
9665 if (!TREE_CONSTANT (size
))
9669 if (error_operand_p (size
))
9670 return error_mark_node
;
9672 /* The array bound must be an integer type. */
9673 tree type
= TREE_TYPE (size
);
9674 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type
))
9676 if (!(complain
& tf_error
))
9677 return error_mark_node
;
9679 error_at (loc
, "size of array %qD has non-integral type %qT",
9682 error_at (loc
, "size of array has non-integral type %qT", type
);
9683 size
= integer_one_node
;
9687 /* A type is dependent if it is...an array type constructed from any
9688 dependent type or whose size is specified by a constant expression
9689 that is value-dependent. */
9690 /* We can only call value_dependent_expression_p on integral constant
9691 expressions; treat non-constant expressions as dependent, too. */
9692 if (processing_template_decl
9693 && (type_dependent_expression_p (size
)
9694 || !TREE_CONSTANT (size
) || value_dependent_expression_p (size
)))
9696 /* We cannot do any checking for a SIZE that isn't known to be
9697 constant. Just build the index type and mark that it requires
9698 structural equality checks. */
9699 itype
= build_index_type (build_min (MINUS_EXPR
, sizetype
,
9700 size
, size_one_node
));
9701 TYPE_DEPENDENT_P (itype
) = 1;
9702 TYPE_DEPENDENT_P_VALID (itype
) = 1;
9703 SET_TYPE_STRUCTURAL_EQUALITY (itype
);
9707 if (TREE_CODE (size
) != INTEGER_CST
)
9709 tree folded
= cp_fully_fold (size
);
9710 if (TREE_CODE (folded
) == INTEGER_CST
)
9713 pedwarn (loc
, OPT_Wpedantic
, "size of array %qD is not an "
9714 "integral constant-expression", name
);
9716 pedwarn (loc
, OPT_Wpedantic
,
9717 "size of array is not an integral constant-expression");
9719 /* Use the folded result for VLAs, too; it will have resolved
9724 /* Normally, the array-bound will be a constant. */
9725 if (TREE_CODE (size
) == INTEGER_CST
)
9727 /* An array must have a positive number of elements. */
9728 if (!valid_constant_size_p (size
))
9730 if (!(complain
& tf_error
))
9731 return error_mark_node
;
9734 error_at (loc
, "size of array %qD is negative", name
);
9736 error_at (loc
, "size of array is negative");
9737 size
= integer_one_node
;
9739 /* As an extension we allow zero-sized arrays. */
9740 else if (integer_zerop (size
))
9742 if (!(complain
& tf_error
))
9743 /* We must fail if performing argument deduction (as
9744 indicated by the state of complain), so that
9745 another substitution can be found. */
9746 return error_mark_node
;
9747 else if (in_system_header_at (input_location
))
9748 /* Allow them in system headers because glibc uses them. */;
9750 pedwarn (loc
, OPT_Wpedantic
,
9751 "ISO C++ forbids zero-size array %qD", name
);
9753 pedwarn (loc
, OPT_Wpedantic
,
9754 "ISO C++ forbids zero-size array");
9757 else if (TREE_CONSTANT (size
)
9758 /* We don't allow VLAs at non-function scopes, or during
9759 tentative template substitution. */
9760 || !at_function_scope_p ()
9761 || !(complain
& tf_error
))
9763 if (!(complain
& tf_error
))
9764 return error_mark_node
;
9765 /* `(int) &fn' is not a valid array bound. */
9768 "size of array %qD is not an integral constant-expression",
9771 error_at (loc
, "size of array is not an integral constant-expression");
9772 size
= integer_one_node
;
9774 else if (pedantic
&& warn_vla
!= 0)
9777 pedwarn (name_loc
, OPT_Wvla
,
9778 "ISO C++ forbids variable length array %qD", name
);
9780 pedwarn (input_location
, OPT_Wvla
,
9781 "ISO C++ forbids variable length array");
9783 else if (warn_vla
> 0)
9786 warning_at (name_loc
, OPT_Wvla
,
9787 "variable length array %qD is used", name
);
9790 "variable length array is used");
9793 if (processing_template_decl
&& !TREE_CONSTANT (size
))
9794 /* A variable sized array. */
9795 itype
= build_min (MINUS_EXPR
, sizetype
, size
, integer_one_node
);
9798 /* Compute the index of the largest element in the array. It is
9799 one less than the number of elements in the array. We save
9800 and restore PROCESSING_TEMPLATE_DECL so that computations in
9801 cp_build_binary_op will be appropriately folded. */
9803 processing_template_decl_sentinel s
;
9804 itype
= cp_build_binary_op (input_location
,
9806 cp_convert (ssizetype
, size
, complain
),
9807 cp_convert (ssizetype
, integer_one_node
,
9810 itype
= maybe_constant_value (itype
);
9813 if (!TREE_CONSTANT (itype
))
9815 /* A variable sized array. */
9816 itype
= variable_size (itype
);
9818 stabilize_vla_size (itype
);
9820 if (sanitize_flags_p (SANITIZE_VLA
)
9821 && current_function_decl
!= NULL_TREE
)
9823 /* We have to add 1 -- in the ubsan routine we generate
9824 LE_EXPR rather than LT_EXPR. */
9825 tree t
= fold_build2 (PLUS_EXPR
, TREE_TYPE (itype
), itype
,
9826 build_one_cst (TREE_TYPE (itype
)));
9827 t
= ubsan_instrument_vla (input_location
, t
);
9828 finish_expr_stmt (t
);
9831 /* Make sure that there was no overflow when creating to a signed
9832 index type. (For example, on a 32-bit machine, an array with
9833 size 2^32 - 1 is too big.) */
9834 else if (TREE_CODE (itype
) == INTEGER_CST
9835 && TREE_OVERFLOW (itype
))
9837 if (!(complain
& tf_error
))
9838 return error_mark_node
;
9839 error ("overflow in array dimension");
9840 TREE_OVERFLOW (itype
) = 0;
9844 /* Create and return the appropriate index type. */
9845 itype
= build_index_type (itype
);
9847 /* If the index type were dependent, we would have returned early, so
9848 remember that it isn't. */
9849 TYPE_DEPENDENT_P (itype
) = 0;
9850 TYPE_DEPENDENT_P_VALID (itype
) = 1;
9855 compute_array_index_type (tree name
, tree size
, tsubst_flags_t complain
)
9857 return compute_array_index_type_loc (input_location
, name
, size
, complain
);
9860 /* Returns the scope (if any) in which the entity declared by
9861 DECLARATOR will be located. If the entity was declared with an
9862 unqualified name, NULL_TREE is returned. */
9865 get_scope_of_declarator (const cp_declarator
*declarator
)
9867 while (declarator
&& declarator
->kind
!= cdk_id
)
9868 declarator
= declarator
->declarator
;
9870 /* If the declarator-id is a SCOPE_REF, the scope in which the
9871 declaration occurs is the first operand. */
9873 && declarator
->u
.id
.qualifying_scope
)
9874 return declarator
->u
.id
.qualifying_scope
;
9876 /* Otherwise, the declarator is not a qualified name; the entity will
9877 be declared in the current scope. */
9881 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
9882 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
9886 create_array_type_for_decl (tree name
, tree type
, tree size
, location_t loc
)
9888 tree itype
= NULL_TREE
;
9890 /* If things have already gone awry, bail now. */
9891 if (type
== error_mark_node
|| size
== error_mark_node
)
9892 return error_mark_node
;
9894 /* 8.3.4/1: If the type of the identifier of D contains the auto
9895 type-specifier, the program is ill-formed. */
9896 if (type_uses_auto (type
))
9899 error_at (loc
, "%qD declared as array of %qT", name
, type
);
9901 error ("creating array of %qT", type
);
9902 return error_mark_node
;
9905 /* If there are some types which cannot be array elements,
9906 issue an error-message and return. */
9907 switch (TREE_CODE (type
))
9911 error_at (loc
, "declaration of %qD as array of void", name
);
9913 error ("creating array of void");
9914 return error_mark_node
;
9918 error_at (loc
, "declaration of %qD as array of functions", name
);
9920 error ("creating array of functions");
9921 return error_mark_node
;
9923 case REFERENCE_TYPE
:
9925 error_at (loc
, "declaration of %qD as array of references", name
);
9927 error ("creating array of references");
9928 return error_mark_node
;
9932 error_at (loc
, "declaration of %qD as array of function members",
9935 error ("creating array of function members");
9936 return error_mark_node
;
9944 The constant expressions that specify the bounds of the arrays
9945 can be omitted only for the first member of the sequence. */
9946 if (TREE_CODE (type
) == ARRAY_TYPE
&& !TYPE_DOMAIN (type
))
9949 error_at (loc
, "declaration of %qD as multidimensional array must "
9950 "have bounds for all dimensions except the first",
9953 error ("multidimensional array must have bounds for all "
9954 "dimensions except the first");
9956 return error_mark_node
;
9959 /* Figure out the index type for the array. */
9961 itype
= compute_array_index_type_loc (loc
, name
, size
,
9962 tf_warning_or_error
);
9965 T is called the array element type; this type shall not be [...] an
9966 abstract class type. */
9967 abstract_virtuals_error (name
, type
);
9969 return build_cplus_array_type (type
, itype
);
9972 /* Returns the smallest location that is not UNKNOWN_LOCATION. */
9975 min_location (location_t loca
, location_t locb
)
9977 if (loca
== UNKNOWN_LOCATION
9978 || (locb
!= UNKNOWN_LOCATION
9979 && linemap_location_before_p (line_table
, locb
, loca
)))
9984 /* Returns the smallest location != UNKNOWN_LOCATION among the
9985 three stored in LOCATIONS[ds_const], LOCATIONS[ds_volatile],
9986 and LOCATIONS[ds_restrict]. */
9989 smallest_type_quals_location (int type_quals
, const location_t
* locations
)
9991 location_t loc
= UNKNOWN_LOCATION
;
9993 if (type_quals
& TYPE_QUAL_CONST
)
9994 loc
= locations
[ds_const
];
9996 if (type_quals
& TYPE_QUAL_VOLATILE
)
9997 loc
= min_location (loc
, locations
[ds_volatile
]);
9999 if (type_quals
& TYPE_QUAL_RESTRICT
)
10000 loc
= min_location (loc
, locations
[ds_restrict
]);
10005 /* Check that it's OK to declare a function with the indicated TYPE
10006 and TYPE_QUALS. SFK indicates the kind of special function (if any)
10007 that this function is. OPTYPE is the type given in a conversion
10008 operator declaration, or the class type for a constructor/destructor.
10009 Returns the actual return type of the function; that may be different
10010 than TYPE if an error occurs, or for certain special functions. */
10013 check_special_function_return_type (special_function_kind sfk
,
10017 const location_t
* locations
)
10021 case sfk_constructor
:
10023 error ("return type specification for constructor invalid");
10024 else if (type_quals
!= TYPE_UNQUALIFIED
)
10025 error_at (smallest_type_quals_location (type_quals
, locations
),
10026 "qualifiers are not allowed on constructor declaration");
10028 if (targetm
.cxx
.cdtor_returns_this ())
10029 type
= build_pointer_type (optype
);
10031 type
= void_type_node
;
10034 case sfk_destructor
:
10036 error ("return type specification for destructor invalid");
10037 else if (type_quals
!= TYPE_UNQUALIFIED
)
10038 error_at (smallest_type_quals_location (type_quals
, locations
),
10039 "qualifiers are not allowed on destructor declaration");
10041 /* We can't use the proper return type here because we run into
10042 problems with ambiguous bases and covariant returns. */
10043 if (targetm
.cxx
.cdtor_returns_this ())
10044 type
= build_pointer_type (void_type_node
);
10046 type
= void_type_node
;
10049 case sfk_conversion
:
10051 error ("return type specified for %<operator %T%>", optype
);
10052 else if (type_quals
!= TYPE_UNQUALIFIED
)
10053 error_at (smallest_type_quals_location (type_quals
, locations
),
10054 "qualifiers are not allowed on declaration of "
10055 "%<operator %T%>", optype
);
10060 case sfk_deduction_guide
:
10062 error ("return type specified for deduction guide");
10063 else if (type_quals
!= TYPE_UNQUALIFIED
)
10064 error_at (smallest_type_quals_location (type_quals
, locations
),
10065 "qualifiers are not allowed on declaration of "
10066 "deduction guide");
10067 if (TREE_CODE (optype
) == TEMPLATE_TEMPLATE_PARM
)
10069 error ("template template parameter %qT in declaration of "
10070 "deduction guide", optype
);
10071 type
= error_mark_node
;
10074 type
= make_template_placeholder (CLASSTYPE_TI_TEMPLATE (optype
));
10075 for (int i
= 0; i
< ds_last
; ++i
)
10076 if (i
!= ds_explicit
&& locations
[i
])
10077 error_at (locations
[i
],
10078 "decl-specifier in declaration of deduction guide");
10082 gcc_unreachable ();
10088 /* A variable or data member (whose unqualified name is IDENTIFIER)
10089 has been declared with the indicated TYPE. If the TYPE is not
10090 acceptable, issue an error message and return a type to use for
10091 error-recovery purposes. */
10094 check_var_type (tree identifier
, tree type
)
10096 if (VOID_TYPE_P (type
))
10099 error ("unnamed variable or field declared void");
10100 else if (identifier_p (identifier
))
10102 gcc_assert (!IDENTIFIER_ANY_OP_P (identifier
));
10103 error ("variable or field %qE declared void", identifier
);
10106 error ("variable or field declared void");
10107 type
= error_mark_node
;
10113 /* Handle declaring DECL as an inline variable. */
10116 mark_inline_variable (tree decl
, location_t loc
)
10118 bool inlinep
= true;
10119 if (! toplevel_bindings_p ())
10121 error_at (loc
, "%<inline%> specifier invalid for variable "
10122 "%qD declared at block scope", decl
);
10125 else if (cxx_dialect
< cxx17
)
10126 pedwarn (loc
, 0, "inline variables are only available "
10127 "with -std=c++17 or -std=gnu++17");
10130 retrofit_lang_decl (decl
);
10131 SET_DECL_VAR_DECLARED_INLINE_P (decl
);
10136 /* Assign a typedef-given name to a class or enumeration type declared
10137 as anonymous at first. This was split out of grokdeclarator
10138 because it is also used in libcc1. */
10141 name_unnamed_type (tree type
, tree decl
)
10143 gcc_assert (TYPE_UNNAMED_P (type
));
10145 /* Replace the anonymous name with the real name everywhere. */
10146 for (tree t
= TYPE_MAIN_VARIANT (type
); t
; t
= TYPE_NEXT_VARIANT (t
))
10148 if (anon_aggrname_p (TYPE_IDENTIFIER (t
)))
10149 /* We do not rename the debug info representing the
10150 unnamed tagged type because the standard says in
10151 [dcl.typedef] that the naming applies only for
10152 linkage purposes. */
10153 /*debug_hooks->set_name (t, decl);*/
10154 TYPE_NAME (t
) = decl
;
10157 if (TYPE_LANG_SPECIFIC (type
))
10158 TYPE_WAS_UNNAMED (type
) = 1;
10160 /* If this is a typedef within a template class, the nested
10161 type is a (non-primary) template. The name for the
10162 template needs updating as well. */
10163 if (TYPE_LANG_SPECIFIC (type
) && CLASSTYPE_TEMPLATE_INFO (type
))
10164 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type
))
10165 = TYPE_IDENTIFIER (type
);
10167 /* Adjust linkage now that we aren't unnamed anymore. */
10168 reset_type_linkage (type
);
10170 /* FIXME remangle member functions; member functions of a
10171 type with external linkage have external linkage. */
10173 /* Check that our job is done, and that it would fail if we
10174 attempted to do it again. */
10175 gcc_assert (!TYPE_UNNAMED_P (type
));
10178 /* Given declspecs and a declarator (abstract or otherwise), determine
10179 the name and type of the object declared and construct a DECL node
10182 DECLSPECS points to the representation of declaration-specifier
10183 sequence that precedes declarator.
10185 DECL_CONTEXT says which syntactic context this declaration is in:
10186 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
10187 FUNCDEF for a function definition. Like NORMAL but a few different
10188 error messages in each case. Return value may be zero meaning
10189 this definition is too screwy to try to parse.
10190 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
10191 handle member functions (which have FIELD context).
10192 Return value may be zero meaning this definition is too screwy to
10194 PARM for a parameter declaration (either within a function prototype
10195 or before a function body). Make a PARM_DECL, or return void_type_node.
10196 TPARM for a template parameter declaration.
10197 CATCHPARM for a parameter declaration before a catch clause.
10198 TYPENAME if for a typename (in a cast or sizeof).
10199 Don't make a DECL node; just return the ..._TYPE node.
10200 FIELD for a struct or union field; make a FIELD_DECL.
10201 BITFIELD for a field with specified width.
10203 INITIALIZED is as for start_decl.
10205 ATTRLIST is a pointer to the list of attributes, which may be NULL
10206 if there are none; *ATTRLIST may be modified if attributes from inside
10207 the declarator should be applied to the declaration.
10209 When this function is called, scoping variables (such as
10210 CURRENT_CLASS_TYPE) should reflect the scope in which the
10211 declaration occurs, not the scope in which the new declaration will
10212 be placed. For example, on:
10214 void S::f() { ... }
10216 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
10219 Returns a DECL (if a declarator is present), a TYPE (if there is no
10220 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
10224 grokdeclarator (const cp_declarator
*declarator
,
10225 cp_decl_specifier_seq
*declspecs
,
10226 enum decl_context decl_context
,
10230 tree type
= NULL_TREE
;
10232 int explicit_intN
= 0;
10233 int virtualp
, explicitp
, friendp
, inlinep
, staticp
;
10234 int explicit_int
= 0;
10235 int explicit_char
= 0;
10236 int defaulted_int
= 0;
10238 tree typedef_decl
= NULL_TREE
;
10239 const char *name
= NULL
;
10240 tree typedef_type
= NULL_TREE
;
10241 /* True if this declarator is a function definition. */
10242 bool funcdef_flag
= false;
10243 cp_declarator_kind innermost_code
= cdk_error
;
10246 /* See the code below that used this. */
10247 tree decl_attr
= NULL_TREE
;
10250 /* Keep track of what sort of function is being processed
10251 so that we can warn about default return values, or explicit
10252 return values which do not match prescribed defaults. */
10253 special_function_kind sfk
= sfk_none
;
10255 tree dname
= NULL_TREE
;
10256 tree ctor_return_type
= NULL_TREE
;
10257 enum overload_flags flags
= NO_SPECIAL
;
10258 /* cv-qualifiers that apply to the declarator, for a declaration of
10259 a member function. */
10260 cp_cv_quals memfn_quals
= TYPE_UNQUALIFIED
;
10261 /* virt-specifiers that apply to the declarator, for a declaration of
10262 a member function. */
10263 cp_virt_specifiers virt_specifiers
= VIRT_SPEC_UNSPECIFIED
;
10264 /* ref-qualifier that applies to the declarator, for a declaration of
10265 a member function. */
10266 cp_ref_qualifier rqual
= REF_QUAL_NONE
;
10267 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
10268 int type_quals
= TYPE_UNQUALIFIED
;
10269 tree raises
= NULL_TREE
;
10270 int template_count
= 0;
10271 tree returned_attrs
= NULL_TREE
;
10272 tree parms
= NULL_TREE
;
10273 const cp_declarator
*id_declarator
;
10274 /* The unqualified name of the declarator; either an
10275 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
10276 tree unqualified_id
;
10277 /* The class type, if any, in which this entity is located,
10278 or NULL_TREE if none. Note that this value may be different from
10279 the current class type; for example if an attempt is made to declare
10280 "A::f" inside "B", this value will be "A". */
10281 tree ctype
= current_class_type
;
10282 /* The NAMESPACE_DECL for the namespace in which this entity is
10283 located. If an unqualified name is used to declare the entity,
10284 this value will be NULL_TREE, even if the entity is located at
10285 namespace scope. */
10286 tree in_namespace
= NULL_TREE
;
10287 cp_storage_class storage_class
;
10288 bool unsigned_p
, signed_p
, short_p
, long_p
, thread_p
;
10289 bool type_was_error_mark_node
= false;
10290 bool parameter_pack_p
= declarator
? declarator
->parameter_pack_p
: false;
10291 bool template_type_arg
= false;
10292 bool template_parm_flag
= false;
10293 bool typedef_p
= decl_spec_seq_has_spec_p (declspecs
, ds_typedef
);
10294 bool constexpr_p
= decl_spec_seq_has_spec_p (declspecs
, ds_constexpr
);
10295 bool late_return_type_p
= false;
10296 bool array_parameter_p
= false;
10297 location_t saved_loc
= input_location
;
10298 tree reqs
= NULL_TREE
;
10300 signed_p
= decl_spec_seq_has_spec_p (declspecs
, ds_signed
);
10301 unsigned_p
= decl_spec_seq_has_spec_p (declspecs
, ds_unsigned
);
10302 short_p
= decl_spec_seq_has_spec_p (declspecs
, ds_short
);
10303 long_p
= decl_spec_seq_has_spec_p (declspecs
, ds_long
);
10304 longlong
= decl_spec_seq_has_spec_p (declspecs
, ds_long_long
);
10305 explicit_intN
= declspecs
->explicit_intN_p
;
10306 thread_p
= decl_spec_seq_has_spec_p (declspecs
, ds_thread
);
10308 // Was concept_p specified? Note that ds_concept
10309 // implies ds_constexpr!
10310 bool concept_p
= decl_spec_seq_has_spec_p (declspecs
, ds_concept
);
10312 constexpr_p
= true;
10314 if (decl_spec_seq_has_spec_p (declspecs
, ds_const
))
10315 type_quals
|= TYPE_QUAL_CONST
;
10316 if (decl_spec_seq_has_spec_p (declspecs
, ds_volatile
))
10317 type_quals
|= TYPE_QUAL_VOLATILE
;
10318 if (decl_spec_seq_has_spec_p (declspecs
, ds_restrict
))
10319 type_quals
|= TYPE_QUAL_RESTRICT
;
10321 if (decl_context
== FUNCDEF
)
10322 funcdef_flag
= true, decl_context
= NORMAL
;
10323 else if (decl_context
== MEMFUNCDEF
)
10324 funcdef_flag
= true, decl_context
= FIELD
;
10325 else if (decl_context
== BITFIELD
)
10326 bitfield
= 1, decl_context
= FIELD
;
10327 else if (decl_context
== TEMPLATE_TYPE_ARG
)
10328 template_type_arg
= true, decl_context
= TYPENAME
;
10329 else if (decl_context
== TPARM
)
10330 template_parm_flag
= true, decl_context
= PARM
;
10332 if (initialized
> 1)
10333 funcdef_flag
= true;
10335 location_t typespec_loc
= smallest_type_quals_location (type_quals
,
10336 declspecs
->locations
);
10337 if (typespec_loc
== UNKNOWN_LOCATION
)
10338 typespec_loc
= declspecs
->locations
[ds_type_spec
];
10339 if (typespec_loc
== UNKNOWN_LOCATION
)
10340 typespec_loc
= input_location
;
10342 /* Look inside a declarator for the name being declared
10343 and get it as a string, for an error message. */
10344 for (id_declarator
= declarator
;
10346 id_declarator
= id_declarator
->declarator
)
10348 if (id_declarator
->kind
!= cdk_id
)
10349 innermost_code
= id_declarator
->kind
;
10351 switch (id_declarator
->kind
)
10354 if (id_declarator
->declarator
10355 && id_declarator
->declarator
->kind
== cdk_id
)
10357 sfk
= id_declarator
->declarator
->u
.id
.sfk
;
10358 if (sfk
== sfk_destructor
)
10365 tree qualifying_scope
= id_declarator
->u
.id
.qualifying_scope
;
10366 tree decl
= id_declarator
->u
.id
.unqualified_name
;
10369 if (qualifying_scope
)
10371 if (check_for_bare_parameter_packs (qualifying_scope
,
10372 id_declarator
->id_loc
))
10373 return error_mark_node
;
10374 if (at_function_scope_p ())
10378 A declarator-id shall not be qualified except
10381 None of the cases are permitted in block
10383 if (qualifying_scope
== global_namespace
)
10384 error ("invalid use of qualified-name %<::%D%>",
10386 else if (TYPE_P (qualifying_scope
))
10387 error ("invalid use of qualified-name %<%T::%D%>",
10388 qualifying_scope
, decl
);
10390 error ("invalid use of qualified-name %<%D::%D%>",
10391 qualifying_scope
, decl
);
10392 return error_mark_node
;
10394 else if (TYPE_P (qualifying_scope
))
10396 ctype
= qualifying_scope
;
10397 if (!MAYBE_CLASS_TYPE_P (ctype
))
10399 error ("%q#T is not a class or a namespace", ctype
);
10402 else if (innermost_code
!= cdk_function
10403 && current_class_type
10404 && !uniquely_derived_from_p (ctype
,
10405 current_class_type
))
10407 error ("invalid use of qualified-name %<%T::%D%>",
10408 qualifying_scope
, decl
);
10409 return error_mark_node
;
10412 else if (TREE_CODE (qualifying_scope
) == NAMESPACE_DECL
)
10413 in_namespace
= qualifying_scope
;
10415 switch (TREE_CODE (decl
))
10419 if (innermost_code
!= cdk_function
)
10421 error ("declaration of %qD as non-function", decl
);
10422 return error_mark_node
;
10424 else if (!qualifying_scope
10425 && !(current_class_type
&& at_class_scope_p ()))
10427 error ("declaration of %qD as non-member", decl
);
10428 return error_mark_node
;
10431 tree type
= TREE_OPERAND (decl
, 0);
10433 type
= constructor_name (type
);
10434 name
= identifier_to_locale (IDENTIFIER_POINTER (type
));
10439 case TEMPLATE_ID_EXPR
:
10441 tree fns
= TREE_OPERAND (decl
, 0);
10444 if (!identifier_p (dname
))
10445 dname
= OVL_NAME (dname
);
10447 /* Fall through. */
10449 case IDENTIFIER_NODE
:
10450 if (identifier_p (decl
))
10453 if (IDENTIFIER_KEYWORD_P (dname
))
10455 error ("declarator-id missing; using reserved word %qD",
10457 name
= identifier_to_locale (IDENTIFIER_POINTER (dname
));
10459 else if (!IDENTIFIER_CONV_OP_P (dname
))
10460 name
= identifier_to_locale (IDENTIFIER_POINTER (dname
));
10463 gcc_assert (flags
== NO_SPECIAL
);
10464 flags
= TYPENAME_FLAG
;
10465 sfk
= sfk_conversion
;
10466 tree glob
= get_global_binding (dname
);
10467 if (glob
&& TREE_CODE (glob
) == TYPE_DECL
)
10468 name
= identifier_to_locale (IDENTIFIER_POINTER (dname
));
10470 name
= "<invalid operator>";
10475 gcc_unreachable ();
10482 case cdk_reference
:
10487 name
= "structured binding";
10491 return error_mark_node
;
10494 gcc_unreachable ();
10496 if (id_declarator
->kind
== cdk_id
)
10502 The declarator in a function-definition shall have the form
10503 D1 ( parameter-declaration-clause) ... */
10504 if (funcdef_flag
&& innermost_code
!= cdk_function
)
10506 error ("function definition does not declare parameters");
10507 return error_mark_node
;
10510 if (flags
== TYPENAME_FLAG
10511 && innermost_code
!= cdk_function
10512 && ! (ctype
&& !declspecs
->any_specifiers_p
))
10514 error ("declaration of %qD as non-function", dname
);
10515 return error_mark_node
;
10518 if (dname
&& identifier_p (dname
))
10520 if (UDLIT_OPER_P (dname
)
10521 && innermost_code
!= cdk_function
)
10523 error ("declaration of %qD as non-function", dname
);
10524 return error_mark_node
;
10527 if (IDENTIFIER_ANY_OP_P (dname
))
10531 error ("declaration of %qD as %<typedef%>", dname
);
10532 return error_mark_node
;
10534 else if (decl_context
== PARM
|| decl_context
== CATCHPARM
)
10536 error ("declaration of %qD as parameter", dname
);
10537 return error_mark_node
;
10542 /* Anything declared one level down from the top level
10543 must be one of the parameters of a function
10544 (because the body is at least two levels down). */
10546 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
10547 by not allowing C++ class definitions to specify their parameters
10548 with xdecls (must be spec.d in the parmlist).
10550 Since we now wait to push a class scope until we are sure that
10551 we are in a legitimate method context, we must set oldcname
10552 explicitly (since current_class_name is not yet alive).
10554 We also want to avoid calling this a PARM if it is in a namespace. */
10556 if (decl_context
== NORMAL
&& !toplevel_bindings_p ())
10558 cp_binding_level
*b
= current_binding_level
;
10559 current_binding_level
= b
->level_chain
;
10560 if (current_binding_level
!= 0 && toplevel_bindings_p ())
10561 decl_context
= PARM
;
10562 current_binding_level
= b
;
10566 name
= decl_context
== PARM
? "parameter" : "type name";
10568 if (concept_p
&& typedef_p
)
10570 error_at (declspecs
->locations
[ds_concept
],
10571 "%<concept%> cannot appear in a typedef declaration");
10572 return error_mark_node
;
10575 if (constexpr_p
&& typedef_p
)
10577 error_at (declspecs
->locations
[ds_constexpr
],
10578 "%<constexpr%> cannot appear in a typedef declaration");
10579 return error_mark_node
;
10582 /* If there were multiple types specified in the decl-specifier-seq,
10583 issue an error message. */
10584 if (declspecs
->multiple_types_p
)
10586 error ("two or more data types in declaration of %qs", name
);
10587 return error_mark_node
;
10590 if (declspecs
->conflicting_specifiers_p
)
10592 error ("conflicting specifiers in declaration of %qs", name
);
10593 return error_mark_node
;
10596 /* Extract the basic type from the decl-specifier-seq. */
10597 type
= declspecs
->type
;
10598 if (type
== error_mark_node
)
10601 type_was_error_mark_node
= true;
10603 cp_warn_deprecated_use (type
);
10604 if (type
&& TREE_CODE (type
) == TYPE_DECL
)
10606 typedef_decl
= type
;
10607 type
= TREE_TYPE (typedef_decl
);
10608 if (DECL_ARTIFICIAL (typedef_decl
))
10609 cp_warn_deprecated_use (type
);
10611 /* No type at all: default to `int', and set DEFAULTED_INT
10612 because it was not a user-defined typedef. */
10613 if (type
== NULL_TREE
)
10615 if (signed_p
|| unsigned_p
|| long_p
|| short_p
)
10617 /* These imply 'int'. */
10618 type
= integer_type_node
;
10621 /* If we just have "complex", it is equivalent to "complex double". */
10622 else if (!longlong
&& !explicit_intN
10623 && decl_spec_seq_has_spec_p (declspecs
, ds_complex
))
10625 type
= double_type_node
;
10626 pedwarn (declspecs
->locations
[ds_complex
], OPT_Wpedantic
,
10627 "ISO C++ does not support plain %<complex%> meaning "
10628 "%<double complex%>");
10631 /* Gather flags. */
10632 explicit_int
= declspecs
->explicit_int_p
;
10633 explicit_char
= declspecs
->explicit_char_p
;
10636 /* See the code below that used this. */
10638 decl_attr
= DECL_ATTRIBUTES (typedef_decl
);
10640 typedef_type
= type
;
10642 if (sfk
== sfk_conversion
|| sfk
== sfk_deduction_guide
)
10643 ctor_return_type
= TREE_TYPE (dname
);
10645 ctor_return_type
= ctype
;
10647 if (sfk
!= sfk_none
)
10649 type
= check_special_function_return_type (sfk
, type
,
10652 declspecs
->locations
);
10653 type_quals
= TYPE_UNQUALIFIED
;
10655 else if (type
== NULL_TREE
)
10661 /* We handle `main' specially here, because 'main () { }' is so
10662 common. With no options, it is allowed. With -Wreturn-type,
10663 it is a warning. It is only an error with -pedantic-errors. */
10664 is_main
= (funcdef_flag
10665 && dname
&& identifier_p (dname
)
10666 && MAIN_NAME_P (dname
)
10667 && ctype
== NULL_TREE
10668 && in_namespace
== NULL_TREE
10669 && current_namespace
== global_namespace
);
10671 if (type_was_error_mark_node
)
10672 /* We've already issued an error, don't complain more. */;
10673 else if (in_system_header_at (input_location
) || flag_ms_extensions
)
10674 /* Allow it, sigh. */;
10675 else if (! is_main
)
10676 permerror (input_location
, "ISO C++ forbids declaration of %qs with no type", name
);
10678 pedwarn (input_location
, OPT_Wpedantic
,
10679 "ISO C++ forbids declaration of %qs with no type", name
);
10681 warning (OPT_Wreturn_type
,
10682 "ISO C++ forbids declaration of %qs with no type", name
);
10684 if (type_was_error_mark_node
&& template_parm_flag
)
10685 /* FIXME we should be able to propagate the error_mark_node as is
10686 for other contexts too. */
10687 type
= error_mark_node
;
10689 type
= integer_type_node
;
10696 if (! int_n_enabled_p
[declspecs
->int_n_idx
])
10698 error ("%<__int%d%> is not supported by this target",
10699 int_n_data
[declspecs
->int_n_idx
].bitsize
);
10700 explicit_intN
= false;
10702 else if (pedantic
&& ! in_system_header_at (input_location
))
10703 pedwarn (input_location
, OPT_Wpedantic
,
10704 "ISO C++ does not support %<__int%d%> for %qs",
10705 int_n_data
[declspecs
->int_n_idx
].bitsize
, name
);
10708 /* Now process the modifiers that were specified
10709 and check for invalid combinations. */
10711 /* Long double is a special combination. */
10712 if (long_p
&& !longlong
&& TYPE_MAIN_VARIANT (type
) == double_type_node
)
10715 type
= cp_build_qualified_type (long_double_type_node
,
10716 cp_type_quals (type
));
10719 /* Check all other uses of type modifiers. */
10721 if (unsigned_p
|| signed_p
|| long_p
|| short_p
)
10728 loc
= declspecs
->locations
[ds_unsigned
];
10733 loc
= declspecs
->locations
[ds_signed
];
10738 loc
= declspecs
->locations
[ds_long_long
];
10743 loc
= declspecs
->locations
[ds_long
];
10745 else /* if (short_p) */
10748 loc
= declspecs
->locations
[ds_short
];
10753 if (signed_p
&& unsigned_p
)
10755 gcc_rich_location
richloc (declspecs
->locations
[ds_signed
]);
10756 richloc
.add_range (declspecs
->locations
[ds_unsigned
]);
10757 error_at (&richloc
,
10758 "%<signed%> and %<unsigned%> specified together");
10760 else if (long_p
&& short_p
)
10762 gcc_rich_location
richloc (declspecs
->locations
[ds_long
]);
10763 richloc
.add_range (declspecs
->locations
[ds_short
]);
10764 error_at (&richloc
, "%<long%> and %<short%> specified together");
10766 else if (TREE_CODE (type
) != INTEGER_TYPE
10767 || type
== char16_type_node
|| type
== char32_type_node
10768 || ((long_p
|| short_p
)
10769 && (explicit_char
|| explicit_intN
)))
10770 error_at (loc
, "%qs specified with %qT", key
, type
);
10771 else if (!explicit_int
&& !defaulted_int
10772 && !explicit_char
&& !explicit_intN
)
10776 pedwarn (loc
, OPT_Wpedantic
, "%qs specified with %qT",
10778 ok
= !flag_pedantic_errors
;
10780 else if (declspecs
->decltype_p
)
10781 error_at (loc
, "%qs specified with %<decltype%>", key
);
10783 error_at (loc
, "%qs specified with %<typeof%>", key
);
10788 /* Discard the type modifiers if they are invalid. */
10791 unsigned_p
= false;
10799 /* Decide whether an integer type is signed or not.
10800 Optionally treat bitfields as signed by default. */
10804 It is implementation-defined whether a plain (neither
10805 explicitly signed or unsigned) char, short, int, or long
10806 bit-field is signed or unsigned.
10808 Naturally, we extend this to long long as well. Note that
10809 this does not include wchar_t. */
10810 || (bitfield
&& !flag_signed_bitfields
10812 /* A typedef for plain `int' without `signed' can be
10813 controlled just like plain `int', but a typedef for
10814 `signed int' cannot be so controlled. */
10816 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
))
10817 && TREE_CODE (type
) == INTEGER_TYPE
10818 && !same_type_p (TYPE_MAIN_VARIANT (type
), wchar_type_node
)))
10821 type
= int_n_trees
[declspecs
->int_n_idx
].unsigned_type
;
10823 type
= long_long_unsigned_type_node
;
10825 type
= long_unsigned_type_node
;
10827 type
= short_unsigned_type_node
;
10828 else if (type
== char_type_node
)
10829 type
= unsigned_char_type_node
;
10830 else if (typedef_decl
)
10831 type
= unsigned_type_for (type
);
10833 type
= unsigned_type_node
;
10835 else if (signed_p
&& type
== char_type_node
)
10836 type
= signed_char_type_node
;
10837 else if (explicit_intN
)
10838 type
= int_n_trees
[declspecs
->int_n_idx
].signed_type
;
10840 type
= long_long_integer_type_node
;
10842 type
= long_integer_type_node
;
10844 type
= short_integer_type_node
;
10846 if (decl_spec_seq_has_spec_p (declspecs
, ds_complex
))
10848 if (TREE_CODE (type
) != INTEGER_TYPE
&& TREE_CODE (type
) != REAL_TYPE
)
10849 error ("complex invalid for %qs", name
);
10850 /* If a modifier is specified, the resulting complex is the complex
10851 form of TYPE. E.g, "complex short" is "complex short int". */
10852 else if (type
== integer_type_node
)
10853 type
= complex_integer_type_node
;
10854 else if (type
== float_type_node
)
10855 type
= complex_float_type_node
;
10856 else if (type
== double_type_node
)
10857 type
= complex_double_type_node
;
10858 else if (type
== long_double_type_node
)
10859 type
= complex_long_double_type_node
;
10861 type
= build_complex_type (type
);
10864 /* If we're using the injected-class-name to form a compound type or a
10865 declaration, replace it with the underlying class so we don't get
10866 redundant typedefs in the debug output. But if we are returning the
10867 type unchanged, leave it alone so that it's available to
10868 maybe_get_template_decl_from_type_decl. */
10869 if (CLASS_TYPE_P (type
)
10870 && DECL_SELF_REFERENCE_P (TYPE_NAME (type
))
10871 && type
== TREE_TYPE (TYPE_NAME (type
))
10872 && (declarator
|| type_quals
))
10873 type
= DECL_ORIGINAL_TYPE (TYPE_NAME (type
));
10875 type_quals
|= cp_type_quals (type
);
10876 type
= cp_build_qualified_type_real
10877 (type
, type_quals
, ((((typedef_decl
&& !DECL_ARTIFICIAL (typedef_decl
))
10878 || declspecs
->decltype_p
)
10879 ? tf_ignore_bad_quals
: 0) | tf_warning_or_error
));
10880 /* We might have ignored or rejected some of the qualifiers. */
10881 type_quals
= cp_type_quals (type
);
10883 if (cxx_dialect
>= cxx17
&& type
&& is_auto (type
)
10884 && innermost_code
!= cdk_function
10885 && id_declarator
&& declarator
!= id_declarator
)
10886 if (tree tmpl
= CLASS_PLACEHOLDER_TEMPLATE (type
))
10888 error_at (typespec_loc
, "template placeholder type %qT must be followed "
10889 "by a simple declarator-id", type
);
10890 inform (DECL_SOURCE_LOCATION (tmpl
), "%qD declared here", tmpl
);
10894 inlinep
= decl_spec_seq_has_spec_p (declspecs
, ds_inline
);
10895 virtualp
= decl_spec_seq_has_spec_p (declspecs
, ds_virtual
);
10896 explicitp
= decl_spec_seq_has_spec_p (declspecs
, ds_explicit
);
10898 storage_class
= declspecs
->storage_class
;
10899 if (storage_class
== sc_static
)
10900 staticp
= 1 + (decl_context
== FIELD
);
10906 gcc_rich_location
richloc (declspecs
->locations
[ds_virtual
]);
10907 richloc
.add_range (declspecs
->locations
[ds_storage_class
]);
10908 error_at (&richloc
, "member %qD cannot be declared both %<virtual%> "
10909 "and %<static%>", dname
);
10910 storage_class
= sc_none
;
10913 if (constexpr_p
&& cxx_dialect
< cxx2a
)
10915 gcc_rich_location
richloc (declspecs
->locations
[ds_virtual
]);
10916 richloc
.add_range (declspecs
->locations
[ds_constexpr
]);
10917 pedwarn (&richloc
, OPT_Wpedantic
, "member %qD can be declared both "
10918 "%<virtual%> and %<constexpr%> only in -std=c++2a or "
10919 "-std=gnu++2a", dname
);
10922 friendp
= decl_spec_seq_has_spec_p (declspecs
, ds_friend
);
10924 /* Issue errors about use of storage classes for parameters. */
10925 if (decl_context
== PARM
)
10929 error_at (declspecs
->locations
[ds_typedef
],
10930 "typedef declaration invalid in parameter declaration");
10931 return error_mark_node
;
10933 else if (template_parm_flag
&& storage_class
!= sc_none
)
10935 error_at (min_location (declspecs
->locations
[ds_thread
],
10936 declspecs
->locations
[ds_storage_class
]),
10937 "storage class specified for template parameter %qs",
10939 return error_mark_node
;
10941 else if (storage_class
== sc_static
10942 || storage_class
== sc_extern
10945 error_at (min_location (declspecs
->locations
[ds_thread
],
10946 declspecs
->locations
[ds_storage_class
]),
10947 "storage class specified for parameter %qs", name
);
10948 return error_mark_node
;
10951 /* Function parameters cannot be concept. */
10953 error_at (declspecs
->locations
[ds_concept
],
10954 "a parameter cannot be declared %<concept%>");
10955 /* Function parameters cannot be constexpr. If we saw one, moan
10956 and pretend it wasn't there. */
10957 else if (constexpr_p
)
10959 error_at (declspecs
->locations
[ds_constexpr
],
10960 "a parameter cannot be declared %<constexpr%>");
10965 /* Give error if `virtual' is used outside of class declaration. */
10967 && (current_class_name
== NULL_TREE
|| decl_context
!= FIELD
))
10969 error_at (declspecs
->locations
[ds_virtual
],
10970 "%<virtual%> outside class declaration");
10974 if (innermost_code
== cdk_decomp
)
10976 location_t loc
= (declarator
->kind
== cdk_reference
10977 ? declarator
->declarator
->id_loc
: declarator
->id_loc
);
10979 error_at (declspecs
->locations
[ds_inline
],
10980 "structured binding declaration cannot be %<inline%>");
10982 error_at (declspecs
->locations
[ds_typedef
],
10983 "structured binding declaration cannot be %<typedef%>");
10985 error_at (declspecs
->locations
[ds_constexpr
], "structured "
10986 "binding declaration cannot be %<constexpr%>");
10988 error_at (declspecs
->locations
[ds_thread
],
10989 "structured binding declaration cannot be %qs",
10990 declspecs
->gnu_thread_keyword_p
10991 ? "__thread" : "thread_local");
10993 error_at (declspecs
->locations
[ds_concept
],
10994 "structured binding declaration cannot be %<concept%>");
10995 switch (storage_class
)
11000 error_at (loc
, "structured binding declaration cannot be "
11004 error_at (loc
, "structured binding declaration cannot be "
11008 error_at (loc
, "structured binding declaration cannot be "
11012 error_at (loc
, "structured binding declaration cannot be "
11016 error_at (loc
, "structured binding declaration cannot be "
11020 gcc_unreachable ();
11022 if (TREE_CODE (type
) != TEMPLATE_TYPE_PARM
11023 || TYPE_IDENTIFIER (type
) != auto_identifier
)
11025 if (type
!= error_mark_node
)
11027 error_at (loc
, "structured binding declaration cannot have "
11030 "type must be cv-qualified %<auto%> or reference to "
11031 "cv-qualified %<auto%>");
11033 type
= build_qualified_type (make_auto (), type_quals
);
11034 declspecs
->type
= type
;
11041 storage_class
= sc_none
;
11043 declspecs
->storage_class
= sc_none
;
11044 declspecs
->locations
[ds_thread
] = UNKNOWN_LOCATION
;
11047 /* Static anonymous unions are dealt with here. */
11048 if (staticp
&& decl_context
== TYPENAME
11050 && ANON_AGGR_TYPE_P (declspecs
->type
))
11051 decl_context
= FIELD
;
11053 /* Warn about storage classes that are invalid for certain
11054 kinds of declarations (parameters, typenames, etc.). */
11057 && storage_class
!= sc_extern
11058 && storage_class
!= sc_static
)
11061 error ("multiple storage classes in declaration of %qs", name
);
11064 if (decl_context
!= NORMAL
11065 && ((storage_class
!= sc_none
11066 && storage_class
!= sc_mutable
)
11069 if ((decl_context
== PARM
|| decl_context
== CATCHPARM
)
11070 && (storage_class
== sc_register
11071 || storage_class
== sc_auto
))
11073 else if (typedef_p
)
11075 else if (decl_context
== FIELD
11076 /* C++ allows static class elements. */
11077 && storage_class
== sc_static
)
11078 /* C++ also allows inlines and signed and unsigned elements,
11079 but in those cases we don't come in here. */
11084 = min_location (declspecs
->locations
[ds_thread
],
11085 declspecs
->locations
[ds_storage_class
]);
11086 if (decl_context
== FIELD
)
11087 error_at (loc
, "storage class specified for %qs", name
);
11088 else if (decl_context
== PARM
|| decl_context
== CATCHPARM
)
11089 error_at (loc
, "storage class specified for parameter %qs", name
);
11091 error_at (loc
, "storage class specified for typename");
11092 if (storage_class
== sc_register
11093 || storage_class
== sc_auto
11094 || storage_class
== sc_extern
11096 storage_class
= sc_none
;
11099 else if (storage_class
== sc_extern
&& funcdef_flag
11100 && ! toplevel_bindings_p ())
11101 error ("nested function %qs declared %<extern%>", name
);
11102 else if (toplevel_bindings_p ())
11104 if (storage_class
== sc_auto
)
11105 error ("top-level declaration of %qs specifies %<auto%>", name
);
11108 && storage_class
!= sc_extern
11109 && storage_class
!= sc_static
)
11111 if (declspecs
->gnu_thread_keyword_p
)
11112 pedwarn (declspecs
->locations
[ds_thread
],
11113 0, "function-scope %qs implicitly auto and "
11114 "declared %<__thread%>", name
);
11116 /* When thread_local is applied to a variable of block scope the
11117 storage-class-specifier static is implied if it does not appear
11119 storage_class
= declspecs
->storage_class
= sc_static
;
11123 if (storage_class
&& friendp
)
11125 error_at (min_location (declspecs
->locations
[ds_thread
],
11126 declspecs
->locations
[ds_storage_class
]),
11127 "storage class specifiers invalid in friend function "
11129 storage_class
= sc_none
;
11133 if (!id_declarator
)
11134 unqualified_id
= NULL_TREE
;
11137 unqualified_id
= id_declarator
->u
.id
.unqualified_name
;
11138 switch (TREE_CODE (unqualified_id
))
11141 unqualified_id
= TREE_OPERAND (unqualified_id
, 0);
11142 if (TYPE_P (unqualified_id
))
11143 unqualified_id
= constructor_name (unqualified_id
);
11146 case IDENTIFIER_NODE
:
11147 case TEMPLATE_ID_EXPR
:
11151 gcc_unreachable ();
11155 if (declspecs
->std_attributes
)
11157 location_t attr_loc
= declspecs
->locations
[ds_std_attribute
];
11158 if (warning_at (attr_loc
, OPT_Wattributes
, "attribute ignored"))
11159 inform (attr_loc
, "an attribute that appertains to a type-specifier "
11163 /* Determine the type of the entity declared by recurring on the
11165 for (; declarator
; declarator
= declarator
->declarator
)
11167 const cp_declarator
*inner_declarator
;
11170 if (type
== error_mark_node
)
11171 return error_mark_node
;
11173 attrs
= declarator
->attributes
;
11179 if (declarator
== NULL
|| declarator
->kind
== cdk_id
)
11180 attr_flags
|= (int) ATTR_FLAG_DECL_NEXT
;
11181 if (declarator
->kind
== cdk_function
)
11182 attr_flags
|= (int) ATTR_FLAG_FUNCTION_NEXT
;
11183 if (declarator
->kind
== cdk_array
)
11184 attr_flags
|= (int) ATTR_FLAG_ARRAY_NEXT
;
11185 returned_attrs
= decl_attributes (&type
,
11186 chainon (returned_attrs
, attrs
),
11190 inner_declarator
= declarator
->declarator
;
11192 /* We don't want to warn in parameter context because we don't
11193 yet know if the parse will succeed, and this might turn out
11194 to be a constructor call. */
11195 if (decl_context
!= PARM
11196 && decl_context
!= TYPENAME
11198 && declarator
->parenthesized
!= UNKNOWN_LOCATION
11199 /* If the type is class-like and the inner name used a
11200 global namespace qualifier, we need the parens.
11201 Unfortunately all we can tell is whether a qualified name
11202 was used or not. */
11203 && !(inner_declarator
11204 && inner_declarator
->kind
== cdk_id
11205 && inner_declarator
->u
.id
.qualifying_scope
11206 && (MAYBE_CLASS_TYPE_P (type
)
11207 || TREE_CODE (type
) == ENUMERAL_TYPE
)))
11208 warning_at (declarator
->parenthesized
, OPT_Wparentheses
,
11209 "unnecessary parentheses in declaration of %qs", name
);
11210 if (declarator
->kind
== cdk_id
|| declarator
->kind
== cdk_decomp
)
11213 switch (declarator
->kind
)
11216 type
= create_array_type_for_decl (dname
, type
,
11217 declarator
->u
.array
.bounds
,
11218 declarator
->id_loc
);
11219 if (!valid_array_size_p (input_location
, type
, dname
))
11220 type
= error_mark_node
;
11222 if (declarator
->std_attributes
)
11225 The optional attribute-specifier-seq appertains to the
11227 returned_attrs
= chainon (returned_attrs
,
11228 declarator
->std_attributes
);
11236 /* Declaring a function type. */
11238 input_location
= declspecs
->locations
[ds_type_spec
];
11239 abstract_virtuals_error (ACU_RETURN
, type
);
11240 input_location
= saved_loc
;
11242 /* Pick up type qualifiers which should be applied to `this'. */
11243 memfn_quals
= declarator
->u
.function
.qualifiers
;
11244 /* Pick up virt-specifiers. */
11245 virt_specifiers
= declarator
->u
.function
.virt_specifiers
;
11246 /* And ref-qualifier, too */
11247 rqual
= declarator
->u
.function
.ref_qualifier
;
11248 /* And tx-qualifier. */
11249 tree tx_qual
= declarator
->u
.function
.tx_qualifier
;
11250 /* Pick up the exception specifications. */
11251 raises
= declarator
->u
.function
.exception_specification
;
11252 /* If the exception-specification is ill-formed, let's pretend
11253 there wasn't one. */
11254 if (raises
== error_mark_node
)
11255 raises
= NULL_TREE
;
11258 error_at (location_of (reqs
), "requires-clause on return type");
11259 reqs
= declarator
->u
.function
.requires_clause
;
11261 /* Say it's a definition only for the CALL_EXPR
11262 closest to the identifier. */
11263 funcdecl_p
= inner_declarator
&& inner_declarator
->kind
== cdk_id
;
11265 /* Handle a late-specified return type. */
11266 tree late_return_type
= declarator
->u
.function
.late_return_type
;
11268 /* This is the case e.g. for
11269 using T = auto () -> int. */
11270 || inner_declarator
== NULL
)
11272 if (tree auto_node
= type_uses_auto (type
))
11274 if (!late_return_type
)
11276 if (current_class_type
11277 && LAMBDA_TYPE_P (current_class_type
))
11278 /* OK for C++11 lambdas. */;
11279 else if (cxx_dialect
< cxx14
)
11281 error ("%qs function uses "
11282 "%<auto%> type specifier without trailing "
11283 "return type", name
);
11284 inform (input_location
, "deduced return type "
11285 "only available with -std=c++14 or "
11290 error ("virtual function cannot "
11291 "have deduced return type");
11295 else if (!is_auto (type
) && sfk
!= sfk_conversion
)
11297 error ("%qs function with trailing return type has"
11298 " %qT as its type rather than plain %<auto%>",
11300 return error_mark_node
;
11302 else if (is_auto (type
) && AUTO_IS_DECLTYPE (type
))
11305 error ("%qs function with trailing return type has "
11306 "%<decltype(auto)%> as its type rather than "
11307 "plain %<auto%>", name
);
11309 error ("invalid use of %<decltype(auto)%>");
11310 return error_mark_node
;
11312 tree tmpl
= CLASS_PLACEHOLDER_TEMPLATE (auto_node
);
11314 if (tree late_auto
= type_uses_auto (late_return_type
))
11315 tmpl
= CLASS_PLACEHOLDER_TEMPLATE (late_auto
);
11316 if (tmpl
&& funcdecl_p
)
11318 if (!dguide_name_p (unqualified_id
))
11320 error_at (declarator
->id_loc
, "deduced class "
11321 "type %qD in function return type",
11323 inform (DECL_SOURCE_LOCATION (tmpl
),
11324 "%qD declared here", tmpl
);
11325 return error_mark_node
;
11327 else if (!late_return_type
)
11329 error_at (declarator
->id_loc
, "deduction guide "
11330 "for %qT must have trailing return "
11331 "type", TREE_TYPE (tmpl
));
11332 inform (DECL_SOURCE_LOCATION (tmpl
),
11333 "%qD declared here", tmpl
);
11334 return error_mark_node
;
11336 else if (CLASS_TYPE_P (late_return_type
)
11337 && CLASSTYPE_TEMPLATE_INFO (late_return_type
)
11338 && (CLASSTYPE_TI_TEMPLATE (late_return_type
)
11342 error ("trailing return type %qT of deduction guide "
11343 "is not a specialization of %qT",
11344 late_return_type
, TREE_TYPE (tmpl
));
11347 else if (late_return_type
11348 && sfk
!= sfk_conversion
)
11350 if (cxx_dialect
< cxx11
)
11351 /* Not using maybe_warn_cpp0x because this should
11352 always be an error. */
11353 error ("trailing return type only available with "
11354 "-std=c++11 or -std=gnu++11");
11356 error ("%qs function with trailing return type not "
11357 "declared with %<auto%> type specifier", name
);
11358 return error_mark_node
;
11361 type
= splice_late_return_type (type
, late_return_type
);
11362 if (type
== error_mark_node
)
11363 return error_mark_node
;
11365 if (late_return_type
)
11367 late_return_type_p
= true;
11368 type_quals
= cp_type_quals (type
);
11371 if (type_quals
!= TYPE_UNQUALIFIED
)
11373 if (SCALAR_TYPE_P (type
) || VOID_TYPE_P (type
))
11374 warning_at (typespec_loc
, OPT_Wignored_qualifiers
, "type "
11375 "qualifiers ignored on function return type");
11376 /* We now know that the TYPE_QUALS don't apply to the
11377 decl, but to its return type. */
11378 type_quals
= TYPE_UNQUALIFIED
;
11381 /* Error about some types functions can't return. */
11383 if (TREE_CODE (type
) == FUNCTION_TYPE
)
11385 error_at (typespec_loc
, "%qs declared as function returning "
11386 "a function", name
);
11387 return error_mark_node
;
11389 if (TREE_CODE (type
) == ARRAY_TYPE
)
11391 error_at (typespec_loc
, "%qs declared as function returning "
11393 return error_mark_node
;
11396 if (ctype
== NULL_TREE
11397 && decl_context
== FIELD
11400 ctype
= current_class_type
;
11402 if (ctype
&& (sfk
== sfk_constructor
11403 || sfk
== sfk_destructor
))
11405 /* We are within a class's scope. If our declarator name
11406 is the same as the class name, and we are defining
11407 a function, then it is a constructor/destructor, and
11408 therefore returns a void type. */
11410 /* ISO C++ 12.4/2. A destructor may not be declared
11411 const or volatile. A destructor may not be static.
11412 A destructor may not be declared with ref-qualifier.
11414 ISO C++ 12.1. A constructor may not be declared
11415 const or volatile. A constructor may not be
11416 virtual. A constructor may not be static.
11417 A constructor may not be declared with ref-qualifier. */
11419 error ((flags
== DTOR_FLAG
)
11420 ? G_("destructor cannot be static member function")
11421 : G_("constructor cannot be static member function"));
11424 error ((flags
== DTOR_FLAG
)
11425 ? G_("destructors may not be cv-qualified")
11426 : G_("constructors may not be cv-qualified"));
11427 memfn_quals
= TYPE_UNQUALIFIED
;
11432 maybe_warn_cpp0x (CPP0X_REF_QUALIFIER
);
11433 error ((flags
== DTOR_FLAG
)
11434 ? G_("destructors may not be ref-qualified")
11435 : G_("constructors may not be ref-qualified"));
11436 rqual
= REF_QUAL_NONE
;
11439 if (decl_context
== FIELD
11440 && !member_function_or_else (ctype
,
11441 current_class_type
,
11443 return error_mark_node
;
11445 if (flags
!= DTOR_FLAG
)
11447 /* It's a constructor. */
11448 if (explicitp
== 1)
11452 permerror (declspecs
->locations
[ds_virtual
],
11453 "constructors cannot be declared %<virtual%>");
11456 if (decl_context
== FIELD
11457 && sfk
!= sfk_constructor
)
11458 return error_mark_node
;
11460 if (decl_context
== FIELD
)
11467 /* Cannot be both friend and virtual. */
11468 gcc_rich_location
richloc (declspecs
->locations
[ds_virtual
]);
11469 richloc
.add_range (declspecs
->locations
[ds_friend
]);
11470 error_at (&richloc
, "virtual functions cannot be friends");
11473 if (decl_context
== NORMAL
)
11474 error ("friend declaration not in class definition");
11475 if (current_function_decl
&& funcdef_flag
)
11477 error ("can%'t define friend function %qs in a local "
11478 "class definition", name
);
11482 else if (ctype
&& sfk
== sfk_conversion
)
11484 if (explicitp
== 1)
11486 maybe_warn_cpp0x (CPP0X_EXPLICIT_CONVERSION
);
11489 if (late_return_type_p
)
11490 error ("a conversion function cannot have a trailing return type");
11492 else if (sfk
== sfk_deduction_guide
)
11494 if (explicitp
== 1)
11498 tree pushed_scope
= NULL_TREE
;
11500 && decl_context
!= FIELD
11501 && inner_declarator
->u
.id
.qualifying_scope
11502 && CLASS_TYPE_P (inner_declarator
->u
.id
.qualifying_scope
))
11504 = push_scope (inner_declarator
->u
.id
.qualifying_scope
);
11506 arg_types
= grokparms (declarator
->u
.function
.parameters
, &parms
);
11509 pop_scope (pushed_scope
);
11511 if (inner_declarator
11512 && inner_declarator
->kind
== cdk_id
11513 && inner_declarator
->u
.id
.sfk
== sfk_destructor
11514 && arg_types
!= void_list_node
)
11516 error ("destructors may not have parameters");
11517 arg_types
= void_list_node
;
11521 type
= build_function_type (type
, arg_types
);
11523 tree attrs
= declarator
->std_attributes
;
11526 tree att
= build_tree_list (tx_qual
, NULL_TREE
);
11527 /* transaction_safe applies to the type, but
11528 transaction_safe_dynamic applies to the function. */
11529 if (is_attribute_p ("transaction_safe", tx_qual
))
11530 attrs
= chainon (attrs
, att
);
11532 returned_attrs
= chainon (returned_attrs
, att
);
11537 The optional attribute-specifier-seq appertains to
11538 the function type. */
11539 decl_attributes (&type
, attrs
, 0);
11542 type
= build_exception_variant (type
, raises
);
11547 case cdk_reference
:
11549 /* Filter out pointers-to-references and references-to-references.
11550 We can get these if a TYPE_DECL is used. */
11552 if (TYPE_REF_P (type
))
11554 if (declarator
->kind
!= cdk_reference
)
11556 error ("cannot declare pointer to %q#T", type
);
11557 type
= TREE_TYPE (type
);
11560 /* In C++0x, we allow reference to reference declarations
11561 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
11562 and template type arguments [14.3.1/4 temp.arg.type]. The
11563 check for direct reference to reference declarations, which
11564 are still forbidden, occurs below. Reasoning behind the change
11565 can be found in DR106, DR540, and the rvalue reference
11567 else if (cxx_dialect
== cxx98
)
11569 error ("cannot declare reference to %q#T", type
);
11570 type
= TREE_TYPE (type
);
11573 else if (VOID_TYPE_P (type
))
11575 if (declarator
->kind
== cdk_reference
)
11576 error ("cannot declare reference to %q#T", type
);
11577 else if (declarator
->kind
== cdk_ptrmem
)
11578 error ("cannot declare pointer to %q#T member", type
);
11581 /* We now know that the TYPE_QUALS don't apply to the decl,
11582 but to the target of the pointer. */
11583 type_quals
= TYPE_UNQUALIFIED
;
11585 /* This code used to handle METHOD_TYPE, but I don't think it's
11586 possible to get it here anymore. */
11587 gcc_assert (TREE_CODE (type
) != METHOD_TYPE
);
11588 if (declarator
->kind
== cdk_ptrmem
11589 && TREE_CODE (type
) == FUNCTION_TYPE
)
11591 memfn_quals
|= type_memfn_quals (type
);
11592 type
= build_memfn_type (type
,
11593 declarator
->u
.pointer
.class_type
,
11596 if (type
== error_mark_node
)
11597 return error_mark_node
;
11599 rqual
= REF_QUAL_NONE
;
11600 memfn_quals
= TYPE_UNQUALIFIED
;
11603 if (TREE_CODE (type
) == FUNCTION_TYPE
11604 && (type_memfn_quals (type
) != TYPE_UNQUALIFIED
11605 || type_memfn_rqual (type
) != REF_QUAL_NONE
))
11606 error (declarator
->kind
== cdk_reference
11607 ? G_("cannot declare reference to qualified function type %qT")
11608 : G_("cannot declare pointer to qualified function type %qT"),
11611 /* When the pointed-to type involves components of variable size,
11612 care must be taken to ensure that the size evaluation code is
11613 emitted early enough to dominate all the possible later uses
11614 and late enough for the variables on which it depends to have
11617 This is expected to happen automatically when the pointed-to
11618 type has a name/declaration of it's own, but special attention
11619 is required if the type is anonymous.
11621 We handle the NORMAL and FIELD contexts here by inserting a
11622 dummy statement that just evaluates the size at a safe point
11623 and ensures it is not deferred until e.g. within a deeper
11624 conditional context (c++/43555).
11626 We expect nothing to be needed here for PARM or TYPENAME.
11627 Evaluating the size at this point for TYPENAME would
11628 actually be incorrect, as we might be in the middle of an
11629 expression with side effects on the pointed-to type size
11630 "arguments" prior to the pointer declaration point and the
11631 size evaluation could end up prior to the side effects. */
11633 if (!TYPE_NAME (type
)
11634 && (decl_context
== NORMAL
|| decl_context
== FIELD
)
11635 && at_function_scope_p ()
11636 && variably_modified_type_p (type
, NULL_TREE
))
11638 TYPE_NAME (type
) = build_decl (UNKNOWN_LOCATION
, TYPE_DECL
,
11640 add_decl_expr (TYPE_NAME (type
));
11643 if (declarator
->kind
== cdk_reference
)
11645 /* In C++0x, the type we are creating a reference to might be
11646 a typedef which is itself a reference type. In that case,
11647 we follow the reference collapsing rules in
11648 [7.1.3/8 dcl.typedef] to create the final reference type:
11650 "If a typedef TD names a type that is a reference to a type
11651 T, an attempt to create the type 'lvalue reference to cv TD'
11652 creates the type 'lvalue reference to T,' while an attempt
11653 to create the type "rvalue reference to cv TD' creates the
11656 if (VOID_TYPE_P (type
))
11657 /* We already gave an error. */;
11658 else if (TYPE_REF_P (type
))
11660 if (declarator
->u
.reference
.rvalue_ref
)
11661 /* Leave type alone. */;
11663 type
= cp_build_reference_type (TREE_TYPE (type
), false);
11666 type
= cp_build_reference_type
11667 (type
, declarator
->u
.reference
.rvalue_ref
);
11669 /* In C++0x, we need this check for direct reference to
11670 reference declarations, which are forbidden by
11671 [8.3.2/5 dcl.ref]. Reference to reference declarations
11672 are only allowed indirectly through typedefs and template
11673 type arguments. Example:
11675 void foo(int & &); // invalid ref-to-ref decl
11677 typedef int & int_ref;
11678 void foo(int_ref &); // valid ref-to-ref decl
11680 if (inner_declarator
&& inner_declarator
->kind
== cdk_reference
)
11681 error ("cannot declare reference to %q#T, which is not "
11682 "a typedef or a template type argument", type
);
11684 else if (TREE_CODE (type
) == METHOD_TYPE
)
11685 type
= build_ptrmemfunc_type (build_pointer_type (type
));
11686 else if (declarator
->kind
== cdk_ptrmem
)
11688 gcc_assert (TREE_CODE (declarator
->u
.pointer
.class_type
)
11689 != NAMESPACE_DECL
);
11690 if (declarator
->u
.pointer
.class_type
== error_mark_node
)
11691 /* We will already have complained. */
11692 type
= error_mark_node
;
11694 type
= build_ptrmem_type (declarator
->u
.pointer
.class_type
,
11698 type
= build_pointer_type (type
);
11700 /* Process a list of type modifier keywords (such as
11701 const or volatile) that were given inside the `*' or `&'. */
11703 if (declarator
->u
.pointer
.qualifiers
)
11706 = cp_build_qualified_type (type
,
11707 declarator
->u
.pointer
.qualifiers
);
11708 type_quals
= cp_type_quals (type
);
11711 /* Apply C++11 attributes to the pointer, and not to the
11712 type pointed to. This is unlike what is done for GNU
11713 attributes above. It is to comply with [dcl.ptr]/1:
11715 [the optional attribute-specifier-seq (7.6.1) appertains
11716 to the pointer and not to the object pointed to]. */
11717 if (declarator
->std_attributes
)
11718 decl_attributes (&type
, declarator
->std_attributes
,
11728 gcc_unreachable ();
11732 /* A `constexpr' specifier used in an object declaration declares
11733 the object as `const'. */
11734 if (constexpr_p
&& innermost_code
!= cdk_function
)
11736 /* DR1688 says that a `constexpr' specifier in combination with
11737 `volatile' is valid. */
11739 if (!TYPE_REF_P (type
))
11741 type_quals
|= TYPE_QUAL_CONST
;
11742 type
= cp_build_qualified_type (type
, type_quals
);
11746 if (unqualified_id
&& TREE_CODE (unqualified_id
) == TEMPLATE_ID_EXPR
11747 && TREE_CODE (type
) != FUNCTION_TYPE
11748 && TREE_CODE (type
) != METHOD_TYPE
11749 && !variable_template_p (TREE_OPERAND (unqualified_id
, 0)))
11751 error ("template-id %qD used as a declarator",
11753 unqualified_id
= dname
;
11756 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
11757 qualified with a class-name, turn it into a METHOD_TYPE, unless
11758 we know that the function is static. We take advantage of this
11759 opportunity to do other processing that pertains to entities
11760 explicitly declared to be class members. Note that if DECLARATOR
11761 is non-NULL, we know it is a cdk_id declarator; otherwise, we
11762 would not have exited the loop above. */
11764 && declarator
->kind
== cdk_id
11765 && declarator
->u
.id
.qualifying_scope
11766 && MAYBE_CLASS_TYPE_P (declarator
->u
.id
.qualifying_scope
))
11768 ctype
= declarator
->u
.id
.qualifying_scope
;
11769 ctype
= TYPE_MAIN_VARIANT (ctype
);
11770 template_count
= num_template_headers_for_class (ctype
);
11772 if (ctype
== current_class_type
)
11776 permerror (input_location
, "member functions are implicitly "
11777 "friends of their class");
11781 permerror (declarator
->id_loc
,
11782 "extra qualification %<%T::%> on member %qs",
11785 else if (/* If the qualifying type is already complete, then we
11786 can skip the following checks. */
11787 !COMPLETE_TYPE_P (ctype
)
11788 && (/* If the function is being defined, then
11789 qualifying type must certainly be complete. */
11791 /* A friend declaration of "T::f" is OK, even if
11792 "T" is a template parameter. But, if this
11793 function is not a friend, the qualifying type
11794 must be a class. */
11795 || (!friendp
&& !CLASS_TYPE_P (ctype
))
11796 /* For a declaration, the type need not be
11797 complete, if either it is dependent (since there
11798 is no meaningful definition of complete in that
11799 case) or the qualifying class is currently being
11801 || !(dependent_type_p (ctype
)
11802 || currently_open_class (ctype
)))
11803 /* Check that the qualifying type is complete. */
11804 && !complete_type_or_else (ctype
, NULL_TREE
))
11805 return error_mark_node
;
11806 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
11808 if (current_class_type
11809 && (!friendp
|| funcdef_flag
|| initialized
))
11811 error (funcdef_flag
|| initialized
11812 ? G_("cannot define member function %<%T::%s%> "
11814 : G_("cannot declare member function %<%T::%s%> "
11816 ctype
, name
, current_class_type
);
11817 return error_mark_node
;
11820 else if (typedef_p
&& current_class_type
)
11822 error ("cannot declare member %<%T::%s%> within %qT",
11823 ctype
, name
, current_class_type
);
11824 return error_mark_node
;
11828 if (ctype
== NULL_TREE
&& decl_context
== FIELD
&& friendp
== 0)
11829 ctype
= current_class_type
;
11831 /* Now TYPE has the actual type. */
11833 if (returned_attrs
)
11836 *attrlist
= chainon (returned_attrs
, *attrlist
);
11838 attrlist
= &returned_attrs
;
11842 && declarator
->kind
== cdk_id
11843 && declarator
->std_attributes
11844 && attrlist
!= NULL
)
11846 /* [dcl.meaning]/1: The optional attribute-specifier-seq following
11847 a declarator-id appertains to the entity that is declared. */
11848 if (declarator
->std_attributes
!= error_mark_node
)
11849 *attrlist
= chainon (*attrlist
, declarator
->std_attributes
);
11851 /* We should have already diagnosed the issue (c++/78344). */
11852 gcc_assert (seen_error ());
11855 /* Handle parameter packs. */
11856 if (parameter_pack_p
)
11858 if (decl_context
== PARM
)
11859 /* Turn the type into a pack expansion.*/
11860 type
= make_pack_expansion (type
);
11862 error ("non-parameter %qs cannot be a parameter pack", name
);
11865 if ((decl_context
== FIELD
|| decl_context
== PARM
)
11866 && !processing_template_decl
11867 && variably_modified_type_p (type
, NULL_TREE
))
11869 if (decl_context
== FIELD
)
11870 error ("data member may not have variably modified type %qT", type
);
11872 error ("parameter may not have variably modified type %qT", type
);
11873 type
= error_mark_node
;
11876 if (explicitp
== 1 || (explicitp
&& friendp
))
11878 /* [dcl.fct.spec] (C++11) The explicit specifier shall be used only
11879 in the declaration of a constructor or conversion function within
11880 a class definition. */
11881 if (!current_class_type
)
11882 error_at (declspecs
->locations
[ds_explicit
],
11883 "%<explicit%> outside class declaration");
11885 error_at (declspecs
->locations
[ds_explicit
],
11886 "%<explicit%> in friend declaration");
11888 error_at (declspecs
->locations
[ds_explicit
],
11889 "only declarations of constructors and conversion operators "
11890 "can be %<explicit%>");
11894 if (storage_class
== sc_mutable
)
11896 if (decl_context
!= FIELD
|| friendp
)
11898 error ("non-member %qs cannot be declared %<mutable%>", name
);
11899 storage_class
= sc_none
;
11901 else if (decl_context
== TYPENAME
|| typedef_p
)
11903 error ("non-object member %qs cannot be declared %<mutable%>", name
);
11904 storage_class
= sc_none
;
11906 else if (TREE_CODE (type
) == FUNCTION_TYPE
11907 || TREE_CODE (type
) == METHOD_TYPE
)
11909 error ("function %qs cannot be declared %<mutable%>", name
);
11910 storage_class
= sc_none
;
11914 error ("static %qs cannot be declared %<mutable%>", name
);
11915 storage_class
= sc_none
;
11917 else if (type_quals
& TYPE_QUAL_CONST
)
11919 error ("const %qs cannot be declared %<mutable%>", name
);
11920 storage_class
= sc_none
;
11922 else if (TYPE_REF_P (type
))
11924 permerror (input_location
, "reference %qs cannot be declared "
11925 "%<mutable%>", name
);
11926 storage_class
= sc_none
;
11930 /* If this is declaring a typedef name, return a TYPE_DECL. */
11931 if (typedef_p
&& decl_context
!= TYPENAME
)
11933 bool alias_p
= decl_spec_seq_has_spec_p (declspecs
, ds_alias
);
11936 /* This declaration:
11938 typedef void f(int) const;
11940 declares a function type which is not a member of any
11941 particular class, but which is cv-qualified; for
11942 example "f S::*" declares a pointer to a const-qualified
11943 member function of S. We record the cv-qualification in the
11945 if ((rqual
|| memfn_quals
) && TREE_CODE (type
) == FUNCTION_TYPE
)
11947 type
= apply_memfn_quals (type
, memfn_quals
, rqual
);
11949 /* We have now dealt with these qualifiers. */
11950 memfn_quals
= TYPE_UNQUALIFIED
;
11951 rqual
= REF_QUAL_NONE
;
11954 if (type_uses_auto (type
))
11957 error_at (declspecs
->locations
[ds_type_spec
],
11958 "%<auto%> not allowed in alias declaration");
11960 error_at (declspecs
->locations
[ds_type_spec
],
11961 "typedef declared %<auto%>");
11962 type
= error_mark_node
;
11966 error_at (location_of (reqs
), "requires-clause on typedef");
11968 if (id_declarator
&& declarator
->u
.id
.qualifying_scope
)
11970 error ("typedef name may not be a nested-name-specifier");
11971 type
= error_mark_node
;
11974 if (decl_context
== FIELD
)
11975 decl
= build_lang_decl (TYPE_DECL
, unqualified_id
, type
);
11977 decl
= build_decl (input_location
, TYPE_DECL
, unqualified_id
, type
);
11979 if (decl_context
!= FIELD
)
11981 if (!current_function_decl
)
11982 DECL_CONTEXT (decl
) = FROB_CONTEXT (current_namespace
);
11983 else if (DECL_MAYBE_IN_CHARGE_CDTOR_P (current_function_decl
))
11984 /* The TYPE_DECL is "abstract" because there will be
11985 clones of this constructor/destructor, and there will
11986 be copies of this TYPE_DECL generated in those
11987 clones. The decloning optimization (for space) may
11988 revert this subsequently if it determines that
11989 the clones should share a common implementation. */
11990 DECL_ABSTRACT_P (decl
) = true;
11992 else if (current_class_type
11993 && constructor_name_p (unqualified_id
, current_class_type
))
11994 permerror (input_location
, "ISO C++ forbids nested type %qD with same name "
11995 "as enclosing class",
11998 /* If the user declares "typedef struct {...} foo" then the
11999 struct will have an anonymous name. Fill that name in now.
12000 Nothing can refer to it, so nothing needs know about the name
12002 if (type
!= error_mark_node
12004 && TYPE_NAME (type
)
12005 && TREE_CODE (TYPE_NAME (type
)) == TYPE_DECL
12006 && TYPE_UNNAMED_P (type
)
12007 && declspecs
->type_definition_p
12008 && attributes_naming_typedef_ok (*attrlist
)
12009 && cp_type_quals (type
) == TYPE_UNQUALIFIED
)
12010 name_unnamed_type (type
, decl
);
12013 || (typedef_decl
&& C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
)))
12014 C_TYPEDEF_EXPLICITLY_SIGNED (decl
) = 1;
12016 bad_specifiers (decl
, BSP_TYPE
, virtualp
,
12017 memfn_quals
!= TYPE_UNQUALIFIED
,
12018 inlinep
, friendp
, raises
!= NULL_TREE
,
12019 declspecs
->locations
);
12022 /* Acknowledge that this was written:
12023 `using analias = atype;'. */
12024 TYPE_DECL_ALIAS_P (decl
) = 1;
12029 /* Detect the case of an array type of unspecified size
12030 which came, as such, direct from a typedef name.
12031 We must copy the type, so that the array's domain can be
12032 individually set by the object's initializer. */
12034 if (type
&& typedef_type
12035 && TREE_CODE (type
) == ARRAY_TYPE
&& !TYPE_DOMAIN (type
)
12036 && TYPE_MAIN_VARIANT (type
) == TYPE_MAIN_VARIANT (typedef_type
))
12037 type
= build_cplus_array_type (TREE_TYPE (type
), NULL_TREE
);
12039 /* Detect where we're using a typedef of function type to declare a
12040 function. PARMS will not be set, so we must create it now. */
12042 if (type
== typedef_type
&& TREE_CODE (type
) == FUNCTION_TYPE
)
12044 tree decls
= NULL_TREE
;
12047 for (args
= TYPE_ARG_TYPES (type
);
12048 args
&& args
!= void_list_node
;
12049 args
= TREE_CHAIN (args
))
12051 tree decl
= cp_build_parm_decl (NULL_TREE
, NULL_TREE
,
12052 TREE_VALUE (args
));
12054 DECL_CHAIN (decl
) = decls
;
12058 parms
= nreverse (decls
);
12060 if (decl_context
!= TYPENAME
)
12062 /* The qualifiers on the function type become the qualifiers on
12063 the non-static member function. */
12064 memfn_quals
|= type_memfn_quals (type
);
12065 rqual
= type_memfn_rqual (type
);
12066 type_quals
= TYPE_UNQUALIFIED
;
12070 /* If this is a type name (such as, in a cast or sizeof),
12071 compute the type and return it now. */
12073 if (decl_context
== TYPENAME
)
12075 /* Note that here we don't care about type_quals. */
12077 /* Special case: "friend class foo" looks like a TYPENAME context. */
12082 error ("%<inline%> specified for friend class declaration");
12088 /* Don't allow friend declaration without a class-key. */
12089 if (TREE_CODE (type
) == TEMPLATE_TYPE_PARM
)
12090 permerror (input_location
, "template parameters cannot be friends");
12091 else if (TREE_CODE (type
) == TYPENAME_TYPE
)
12092 permerror (input_location
, "friend declaration requires class-key, "
12093 "i.e. %<friend class %T::%D%>",
12094 TYPE_CONTEXT (type
), TYPENAME_TYPE_FULLNAME (type
));
12096 permerror (input_location
, "friend declaration requires class-key, "
12097 "i.e. %<friend %#T%>",
12101 /* Only try to do this stuff if we didn't already give up. */
12102 if (type
!= integer_type_node
)
12104 /* A friendly class? */
12105 if (current_class_type
)
12106 make_friend_class (current_class_type
, TYPE_MAIN_VARIANT (type
),
12107 /*complain=*/true);
12109 error ("trying to make class %qT a friend of global scope",
12112 type
= void_type_node
;
12115 else if (memfn_quals
|| rqual
)
12117 if (ctype
== NULL_TREE
12118 && TREE_CODE (type
) == METHOD_TYPE
)
12119 ctype
= TYPE_METHOD_BASETYPE (type
);
12122 type
= build_memfn_type (type
, ctype
, memfn_quals
, rqual
);
12123 /* Core issue #547: need to allow this in template type args.
12124 Allow it in general in C++11 for alias-declarations. */
12125 else if ((template_type_arg
|| cxx_dialect
>= cxx11
)
12126 && TREE_CODE (type
) == FUNCTION_TYPE
)
12127 type
= apply_memfn_quals (type
, memfn_quals
, rqual
);
12129 error ("invalid qualifiers on non-member function type");
12133 error_at (location_of (reqs
), "requires-clause on type-id");
12137 else if (unqualified_id
== NULL_TREE
&& decl_context
!= PARM
12138 && decl_context
!= CATCHPARM
12139 && TREE_CODE (type
) != UNION_TYPE
12141 && innermost_code
!= cdk_decomp
)
12143 error ("abstract declarator %qT used as declaration", type
);
12144 return error_mark_node
;
12147 if (!FUNC_OR_METHOD_TYPE_P (type
))
12149 /* Only functions may be declared using an operator-function-id. */
12150 if (dname
&& IDENTIFIER_ANY_OP_P (dname
))
12152 error ("declaration of %qD as non-function", dname
);
12153 return error_mark_node
;
12157 error_at (location_of (reqs
),
12158 "requires-clause on declaration of non-function type %qT",
12162 /* We don't check parameter types here because we can emit a better
12163 error message later. */
12164 if (decl_context
!= PARM
)
12166 type
= check_var_type (unqualified_id
, type
);
12167 if (type
== error_mark_node
)
12168 return error_mark_node
;
12171 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
12172 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
12174 if (decl_context
== PARM
|| decl_context
== CATCHPARM
)
12176 if (ctype
|| in_namespace
)
12177 error ("cannot use %<::%> in parameter declaration");
12179 if (type_uses_auto (type
)
12180 && !(cxx_dialect
>= cxx17
&& template_parm_flag
))
12182 if (cxx_dialect
>= cxx14
)
12183 error ("%<auto%> parameter not permitted in this context");
12185 error ("parameter declared %<auto%>");
12186 type
= error_mark_node
;
12189 /* A parameter declared as an array of T is really a pointer to T.
12190 One declared as a function is really a pointer to a function.
12191 One declared as a member is really a pointer to member. */
12193 if (TREE_CODE (type
) == ARRAY_TYPE
)
12195 /* Transfer const-ness of array into that of type pointed to. */
12196 type
= build_pointer_type (TREE_TYPE (type
));
12197 type_quals
= TYPE_UNQUALIFIED
;
12198 array_parameter_p
= true;
12200 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
12201 type
= build_pointer_type (type
);
12204 if (ctype
&& TREE_CODE (type
) == FUNCTION_TYPE
&& staticp
< 2
12205 && !(unqualified_id
12206 && identifier_p (unqualified_id
)
12207 && IDENTIFIER_NEWDEL_OP_P (unqualified_id
)))
12209 cp_cv_quals real_quals
= memfn_quals
;
12210 if (cxx_dialect
< cxx14
&& constexpr_p
12211 && sfk
!= sfk_constructor
&& sfk
!= sfk_destructor
)
12212 real_quals
|= TYPE_QUAL_CONST
;
12213 type
= build_memfn_type (type
, ctype
, real_quals
, rqual
);
12217 tree decl
= NULL_TREE
;
12218 location_t loc
= declarator
? declarator
->id_loc
: input_location
;
12220 if (decl_context
== PARM
)
12222 decl
= cp_build_parm_decl (NULL_TREE
, unqualified_id
, type
);
12223 DECL_ARRAY_PARAMETER_P (decl
) = array_parameter_p
;
12225 bad_specifiers (decl
, BSP_PARM
, virtualp
,
12226 memfn_quals
!= TYPE_UNQUALIFIED
,
12227 inlinep
, friendp
, raises
!= NULL_TREE
,
12228 declspecs
->locations
);
12230 else if (decl_context
== FIELD
)
12232 if (!staticp
&& !friendp
&& TREE_CODE (type
) != METHOD_TYPE
)
12233 if (tree auto_node
= type_uses_auto (type
))
12235 location_t tloc
= declspecs
->locations
[ds_type_spec
];
12236 if (CLASS_PLACEHOLDER_TEMPLATE (auto_node
))
12237 error_at (tloc
, "invalid use of template-name %qE without an "
12239 CLASS_PLACEHOLDER_TEMPLATE (auto_node
));
12241 error_at (tloc
, "non-static data member declared with "
12242 "placeholder %qT", auto_node
);
12243 type
= error_mark_node
;
12246 /* The C99 flexible array extension. */
12247 if (!staticp
&& TREE_CODE (type
) == ARRAY_TYPE
12248 && TYPE_DOMAIN (type
) == NULL_TREE
)
12251 && (TREE_CODE (ctype
) == UNION_TYPE
12252 || TREE_CODE (ctype
) == QUAL_UNION_TYPE
))
12254 error ("flexible array member in union");
12255 type
= error_mark_node
;
12259 /* Array is a flexible member. */
12260 if (in_system_header_at (input_location
))
12261 /* Do not warn on flexible array members in system
12262 headers because glibc uses them. */;
12263 else if (name
&& declarator
)
12264 pedwarn (declarator
->id_loc
, OPT_Wpedantic
,
12265 "ISO C++ forbids flexible array member %qs", name
);
12267 pedwarn (input_location
, OPT_Wpedantic
,
12268 "ISO C++ forbids flexible array members");
12270 /* Flexible array member has a null domain. */
12271 type
= build_cplus_array_type (TREE_TYPE (type
), NULL_TREE
);
12275 if (type
== error_mark_node
)
12277 /* Happens when declaring arrays of sizes which
12278 are error_mark_node, for example. */
12281 else if (in_namespace
&& !friendp
)
12283 /* Something like struct S { int N::j; }; */
12284 error ("invalid use of %<::%>");
12285 return error_mark_node
;
12287 else if (FUNC_OR_METHOD_TYPE_P (type
) && unqualified_id
)
12290 tree function_context
;
12294 /* This should never happen in pure C++ (the check
12295 could be an assert). It could happen in
12296 Objective-C++ if someone writes invalid code that
12297 uses a function declaration for an instance
12298 variable or property (instance variables and
12299 properties are parsed as FIELD_DECLs, but they are
12300 part of an Objective-C class, not a C++ class).
12301 That code is invalid and is caught by this
12305 error ("declaration of function %qD in invalid context",
12307 return error_mark_node
;
12310 /* ``A union may [ ... ] not [ have ] virtual functions.''
12312 if (virtualp
&& TREE_CODE (ctype
) == UNION_TYPE
)
12314 error_at (declspecs
->locations
[ds_virtual
],
12315 "function %qD declared %<virtual%> inside a union",
12317 return error_mark_node
;
12321 && identifier_p (unqualified_id
)
12322 && IDENTIFIER_NEWDEL_OP_P (unqualified_id
))
12324 error_at (declspecs
->locations
[ds_virtual
],
12325 "%qD cannot be declared %<virtual%>, since it "
12326 "is always static", unqualified_id
);
12331 /* Check that the name used for a destructor makes sense. */
12332 if (sfk
== sfk_destructor
)
12334 tree uqname
= id_declarator
->u
.id
.unqualified_name
;
12338 gcc_assert (friendp
);
12339 error ("expected qualified name in friend declaration "
12340 "for destructor %qD", uqname
);
12341 return error_mark_node
;
12344 if (!check_dtor_name (ctype
, TREE_OPERAND (uqname
, 0)))
12346 error ("declaration of %qD as member of %qT",
12348 return error_mark_node
;
12352 error_at (declspecs
->locations
[ds_concept
],
12353 "a destructor cannot be %<concept%>");
12354 return error_mark_node
;
12358 error_at (declspecs
->locations
[ds_constexpr
],
12359 "a destructor cannot be %<constexpr%>");
12360 return error_mark_node
;
12363 else if (sfk
== sfk_constructor
&& friendp
&& !ctype
)
12365 error ("expected qualified name in friend declaration "
12366 "for constructor %qD",
12367 id_declarator
->u
.id
.unqualified_name
);
12368 return error_mark_node
;
12370 if (sfk
== sfk_constructor
)
12373 error_at (declspecs
->locations
[ds_concept
],
12374 "a constructor cannot be %<concept%>");
12375 return error_mark_node
;
12379 error_at (declspecs
->locations
[ds_concept
],
12380 "a concept cannot be a member function");
12384 if (TREE_CODE (unqualified_id
) == TEMPLATE_ID_EXPR
)
12386 tree tmpl
= TREE_OPERAND (unqualified_id
, 0);
12387 if (variable_template_p (tmpl
))
12389 error ("specialization of variable template %qD "
12390 "declared as function", tmpl
);
12391 inform (DECL_SOURCE_LOCATION (tmpl
),
12392 "variable template declared here");
12393 return error_mark_node
;
12397 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
12398 function_context
= (ctype
!= NULL_TREE
) ?
12399 decl_function_context (TYPE_MAIN_DECL (ctype
)) : NULL_TREE
;
12400 publicp
= (! friendp
|| ! staticp
)
12401 && function_context
== NULL_TREE
;
12403 decl
= grokfndecl (ctype
, type
,
12404 TREE_CODE (unqualified_id
) != TEMPLATE_ID_EXPR
12405 ? unqualified_id
: dname
,
12410 virtualp
, flags
, memfn_quals
, rqual
, raises
,
12411 friendp
? -1 : 0, friendp
, publicp
,
12412 inlinep
| (2 * constexpr_p
) | (4 * concept_p
),
12413 initialized
== SD_DELETED
, sfk
,
12414 funcdef_flag
, late_return_type_p
,
12415 template_count
, in_namespace
,
12416 attrlist
, declarator
->id_loc
);
12417 decl
= set_virt_specifiers (decl
, virt_specifiers
);
12418 if (decl
== NULL_TREE
)
12419 return error_mark_node
;
12421 /* This clobbers the attrs stored in `decl' from `attrlist'. */
12422 /* The decl and setting of decl_attr is also turned off. */
12423 decl
= build_decl_attribute_variant (decl
, decl_attr
);
12426 /* [class.conv.ctor]
12428 A constructor declared without the function-specifier
12429 explicit that can be called with a single parameter
12430 specifies a conversion from the type of its first
12431 parameter to the type of its class. Such a constructor
12432 is called a converting constructor. */
12433 if (explicitp
== 2)
12434 DECL_NONCONVERTING_P (decl
) = 1;
12436 if (declspecs
->explicit_specifier
)
12437 store_explicit_specifier (decl
, declspecs
->explicit_specifier
);
12439 else if (!staticp
&& !dependent_type_p (type
)
12440 && !COMPLETE_TYPE_P (complete_type (type
))
12441 && (!complete_or_array_type_p (type
)
12442 || initialized
== 0))
12444 if (TREE_CODE (type
) != ARRAY_TYPE
12445 || !COMPLETE_TYPE_P (TREE_TYPE (type
)))
12447 if (unqualified_id
)
12449 error_at (declarator
->id_loc
,
12450 "field %qD has incomplete type %qT",
12451 unqualified_id
, type
);
12452 cxx_incomplete_type_inform (strip_array_types (type
));
12455 error ("name %qT has incomplete type", type
);
12457 type
= error_mark_node
;
12465 if (unqualified_id
&& declarator
)
12466 error_at (declarator
->id_loc
,
12467 "%qE is neither function nor member function; "
12468 "cannot be declared friend", unqualified_id
);
12470 error ("unnamed field is neither function nor member "
12471 "function; cannot be declared friend");
12472 return error_mark_node
;
12479 /* Friends are treated specially. */
12480 if (ctype
== current_class_type
)
12481 ; /* We already issued a permerror. */
12482 else if (decl
&& DECL_NAME (decl
))
12484 if (template_class_depth (current_class_type
) == 0)
12486 decl
= check_explicit_specialization
12487 (unqualified_id
, decl
, template_count
,
12488 2 * funcdef_flag
+ 4);
12489 if (decl
== error_mark_node
)
12490 return error_mark_node
;
12493 decl
= do_friend (ctype
, unqualified_id
, decl
,
12499 return error_mark_node
;
12502 /* Structure field. It may not be a function, except for C++. */
12504 if (decl
== NULL_TREE
)
12508 /* C++ allows static class members. All other work
12509 for this is done by grokfield. */
12510 decl
= build_lang_decl_loc (loc
, VAR_DECL
,
12511 unqualified_id
, type
);
12512 set_linkage_for_static_data_member (decl
);
12514 error_at (declspecs
->locations
[ds_concept
],
12515 "static data member %qE declared %<concept%>",
12517 else if (constexpr_p
&& !initialized
)
12519 error ("%<constexpr%> static data member %qD must have an "
12520 "initializer", decl
);
12521 constexpr_p
= false;
12525 mark_inline_variable (decl
, declspecs
->locations
[ds_inline
]);
12527 if (!DECL_VAR_DECLARED_INLINE_P (decl
)
12528 && !(cxx_dialect
>= cxx17
&& constexpr_p
))
12529 /* Even if there is an in-class initialization, DECL
12530 is considered undefined until an out-of-class
12531 definition is provided, unless this is an inline
12533 DECL_EXTERNAL (decl
) = 1;
12537 CP_DECL_THREAD_LOCAL_P (decl
) = true;
12538 if (!processing_template_decl
)
12539 set_decl_tls_model (decl
, decl_default_tls_model (decl
));
12540 if (declspecs
->gnu_thread_keyword_p
)
12541 SET_DECL_GNU_TLS_P (decl
);
12547 error_at (declspecs
->locations
[ds_concept
],
12548 "non-static data member %qE declared %<concept%>",
12550 else if (constexpr_p
)
12552 error_at (declspecs
->locations
[ds_constexpr
],
12553 "non-static data member %qE declared %<constexpr%>",
12555 constexpr_p
= false;
12557 decl
= build_decl (loc
, FIELD_DECL
, unqualified_id
, type
);
12558 DECL_NONADDRESSABLE_P (decl
) = bitfield
;
12559 if (bitfield
&& !unqualified_id
)
12561 TREE_NO_WARNING (decl
) = 1;
12562 DECL_PADDING_P (decl
) = 1;
12565 if (storage_class
== sc_mutable
)
12567 DECL_MUTABLE_P (decl
) = 1;
12568 storage_class
= sc_none
;
12573 /* An attempt is being made to initialize a non-static
12574 member. This is new in C++11. */
12575 maybe_warn_cpp0x (CPP0X_NSDMI
);
12577 /* If this has been parsed with static storage class, but
12578 errors forced staticp to be cleared, ensure NSDMI is
12580 if (declspecs
->storage_class
== sc_static
)
12581 DECL_INITIAL (decl
) = error_mark_node
;
12585 bad_specifiers (decl
, BSP_FIELD
, virtualp
,
12586 memfn_quals
!= TYPE_UNQUALIFIED
,
12587 staticp
? false : inlinep
, friendp
,
12588 raises
!= NULL_TREE
,
12589 declspecs
->locations
);
12592 else if (TREE_CODE (type
) == FUNCTION_TYPE
12593 || TREE_CODE (type
) == METHOD_TYPE
)
12595 tree original_name
;
12598 if (!unqualified_id
)
12599 return error_mark_node
;
12601 if (TREE_CODE (unqualified_id
) == TEMPLATE_ID_EXPR
)
12602 original_name
= dname
;
12604 original_name
= unqualified_id
;
12605 // FIXME:gcc_assert (original_name == dname);
12607 if (storage_class
== sc_auto
)
12608 error ("storage class %<auto%> invalid for function %qs", name
);
12609 else if (storage_class
== sc_register
)
12610 error ("storage class %<register%> invalid for function %qs", name
);
12613 if (declspecs
->gnu_thread_keyword_p
)
12614 error_at (declspecs
->locations
[ds_thread
],
12615 "storage class %<__thread%> invalid for function %qs",
12618 error_at (declspecs
->locations
[ds_thread
],
12619 "storage class %<thread_local%> invalid for "
12620 "function %qs", name
);
12623 if (virt_specifiers
)
12624 error ("virt-specifiers in %qs not allowed outside a class "
12625 "definition", name
);
12626 /* Function declaration not at top level.
12627 Storage classes other than `extern' are not allowed
12628 and `extern' makes no difference. */
12629 if (! toplevel_bindings_p ()
12630 && (storage_class
== sc_static
12631 || decl_spec_seq_has_spec_p (declspecs
, ds_inline
))
12634 if (storage_class
== sc_static
)
12635 pedwarn (declspecs
->locations
[ds_storage_class
], OPT_Wpedantic
,
12636 "%<static%> specifier invalid for function %qs "
12637 "declared out of global scope", name
);
12639 pedwarn (declspecs
->locations
[ds_inline
], OPT_Wpedantic
,
12640 "%<inline%> specifier invalid for function %qs "
12641 "declared out of global scope", name
);
12644 if (ctype
== NULL_TREE
)
12648 error ("virtual non-class function %qs", name
);
12651 else if (sfk
== sfk_constructor
12652 || sfk
== sfk_destructor
)
12654 error (funcdef_flag
12655 ? G_("%qs defined in a non-class scope")
12656 : G_("%qs declared in a non-class scope"), name
);
12661 /* Record whether the function is public. */
12662 publicp
= (ctype
!= NULL_TREE
12663 || storage_class
!= sc_static
);
12665 decl
= grokfndecl (ctype
, type
, original_name
, parms
, unqualified_id
,
12667 reqs
, virtualp
, flags
, memfn_quals
, rqual
, raises
,
12670 inlinep
| (2 * constexpr_p
) | (4 * concept_p
),
12671 initialized
== SD_DELETED
,
12674 late_return_type_p
,
12675 template_count
, in_namespace
, attrlist
,
12676 declarator
->id_loc
);
12677 if (decl
== NULL_TREE
)
12678 return error_mark_node
;
12680 if (explicitp
== 2)
12681 DECL_NONCONVERTING_P (decl
) = 1;
12684 int invalid_static
= 0;
12686 /* Don't allow a static member function in a class, and forbid
12687 declaring main to be static. */
12688 if (TREE_CODE (type
) == METHOD_TYPE
)
12690 permerror (input_location
, "cannot declare member function %qD to have "
12691 "static linkage", decl
);
12692 invalid_static
= 1;
12694 else if (current_function_decl
)
12696 /* 7.1.1: There can be no static function declarations within a
12698 error_at (declspecs
->locations
[ds_storage_class
],
12699 "cannot declare static function inside another function");
12700 invalid_static
= 1;
12703 if (invalid_static
)
12706 storage_class
= sc_none
;
12712 /* It's a variable. */
12714 /* An uninitialized decl with `extern' is a reference. */
12715 decl
= grokvardecl (type
, dname
, unqualified_id
,
12722 ctype
? ctype
: in_namespace
,
12724 if (decl
== NULL_TREE
)
12725 return error_mark_node
;
12727 bad_specifiers (decl
, BSP_VAR
, virtualp
,
12728 memfn_quals
!= TYPE_UNQUALIFIED
,
12729 inlinep
, friendp
, raises
!= NULL_TREE
,
12730 declspecs
->locations
);
12734 DECL_CONTEXT (decl
) = ctype
;
12737 permerror (declspecs
->locations
[ds_storage_class
],
12738 "%<static%> may not be used when defining "
12739 "(as opposed to declaring) a static data member");
12741 storage_class
= sc_none
;
12743 if (storage_class
== sc_register
&& TREE_STATIC (decl
))
12745 error ("static member %qD declared %<register%>", decl
);
12746 storage_class
= sc_none
;
12748 if (storage_class
== sc_extern
&& pedantic
)
12750 pedwarn (input_location
, OPT_Wpedantic
,
12751 "cannot explicitly declare member %q#D to have "
12752 "extern linkage", decl
);
12753 storage_class
= sc_none
;
12756 else if (constexpr_p
&& DECL_EXTERNAL (decl
))
12758 error ("declaration of %<constexpr%> variable %qD "
12759 "is not a definition", decl
);
12760 constexpr_p
= false;
12764 mark_inline_variable (decl
, declspecs
->locations
[ds_inline
]);
12765 if (innermost_code
== cdk_decomp
)
12767 gcc_assert (declarator
&& declarator
->kind
== cdk_decomp
);
12768 DECL_SOURCE_LOCATION (decl
) = declarator
->id_loc
;
12769 DECL_ARTIFICIAL (decl
) = 1;
12770 fit_decomposition_lang_decl (decl
, NULL_TREE
);
12774 if (VAR_P (decl
) && !initialized
)
12775 if (tree auto_node
= type_uses_auto (type
))
12776 if (!CLASS_PLACEHOLDER_TEMPLATE (auto_node
))
12778 location_t loc
= declspecs
->locations
[ds_type_spec
];
12779 error_at (loc
, "declaration of %q#D has no initializer", decl
);
12780 TREE_TYPE (decl
) = error_mark_node
;
12783 if (storage_class
== sc_extern
&& initialized
&& !funcdef_flag
)
12785 if (toplevel_bindings_p ())
12787 /* It's common practice (and completely valid) to have a const
12788 be initialized and declared extern. */
12789 if (!(type_quals
& TYPE_QUAL_CONST
))
12790 warning (0, "%qs initialized and declared %<extern%>", name
);
12794 error ("%qs has both %<extern%> and initializer", name
);
12795 return error_mark_node
;
12799 /* Record `register' declaration for warnings on &
12800 and in case doing stupid register allocation. */
12802 if (storage_class
== sc_register
)
12804 DECL_REGISTER (decl
) = 1;
12805 /* Warn about register storage specifiers on PARM_DECLs. */
12806 if (TREE_CODE (decl
) == PARM_DECL
)
12808 if (cxx_dialect
>= cxx17
)
12809 pedwarn (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
12810 "ISO C++17 does not allow %<register%> storage "
12811 "class specifier");
12813 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
12814 "%<register%> storage class specifier used");
12817 else if (storage_class
== sc_extern
)
12818 DECL_THIS_EXTERN (decl
) = 1;
12819 else if (storage_class
== sc_static
)
12820 DECL_THIS_STATIC (decl
) = 1;
12822 /* Set constexpr flag on vars (functions got it in grokfndecl). */
12823 if (constexpr_p
&& VAR_P (decl
))
12824 DECL_DECLARED_CONSTEXPR_P (decl
) = true;
12826 /* Record constancy and volatility on the DECL itself . There's
12827 no need to do this when processing a template; we'll do this
12828 for the instantiated declaration based on the type of DECL. */
12829 if (!processing_template_decl
)
12830 cp_apply_type_quals_to_decl (type_quals
, decl
);
12836 /* Subroutine of start_function. Ensure that each of the parameter
12837 types (as listed in PARMS) is complete, as is required for a
12838 function definition. */
12841 require_complete_types_for_parms (tree parms
)
12843 for (; parms
; parms
= DECL_CHAIN (parms
))
12845 if (dependent_type_p (TREE_TYPE (parms
)))
12847 if (!VOID_TYPE_P (TREE_TYPE (parms
))
12848 && complete_type_or_else (TREE_TYPE (parms
), parms
))
12850 relayout_decl (parms
);
12851 DECL_ARG_TYPE (parms
) = type_passed_as (TREE_TYPE (parms
));
12853 maybe_warn_parm_abi (TREE_TYPE (parms
),
12854 DECL_SOURCE_LOCATION (parms
));
12857 /* grokparms or complete_type_or_else will have already issued
12859 TREE_TYPE (parms
) = error_mark_node
;
12863 /* Returns nonzero if T is a local variable. */
12866 local_variable_p (const_tree t
)
12869 /* A VAR_DECL with a context that is a _TYPE is a static data
12871 && !TYPE_P (CP_DECL_CONTEXT (t
))
12872 /* Any other non-local variable must be at namespace scope. */
12873 && !DECL_NAMESPACE_SCOPE_P (t
))
12874 || (TREE_CODE (t
) == PARM_DECL
))
12880 /* Like local_variable_p, but suitable for use as a tree-walking
12884 local_variable_p_walkfn (tree
*tp
, int *walk_subtrees
,
12887 if (local_variable_p (*tp
)
12888 && (!DECL_ARTIFICIAL (*tp
) || DECL_NAME (*tp
) == this_identifier
))
12890 else if (TYPE_P (*tp
))
12891 *walk_subtrees
= 0;
12896 /* Check that ARG, which is a default-argument expression for a
12897 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
12898 something goes wrong. DECL may also be a _TYPE node, rather than a
12899 DECL, if there is no DECL available. */
12902 check_default_argument (tree decl
, tree arg
, tsubst_flags_t complain
)
12907 if (TREE_CODE (arg
) == DEFAULT_ARG
)
12908 /* We get a DEFAULT_ARG when looking at an in-class declaration
12909 with a default argument. Ignore the argument for now; we'll
12910 deal with it after the class is complete. */
12919 decl_type
= TREE_TYPE (decl
);
12921 if (arg
== error_mark_node
12922 || decl
== error_mark_node
12923 || TREE_TYPE (arg
) == error_mark_node
12924 || decl_type
== error_mark_node
)
12925 /* Something already went wrong. There's no need to check
12927 return error_mark_node
;
12929 /* [dcl.fct.default]
12931 A default argument expression is implicitly converted to the
12933 ++cp_unevaluated_operand
;
12934 /* Avoid digest_init clobbering the initializer. */
12935 tree carg
= BRACE_ENCLOSED_INITIALIZER_P (arg
) ? unshare_expr (arg
): arg
;
12936 perform_implicit_conversion_flags (decl_type
, carg
, complain
,
12938 --cp_unevaluated_operand
;
12940 /* Avoid redundant -Wzero-as-null-pointer-constant warnings at
12942 if (TYPE_PTR_OR_PTRMEM_P (decl_type
)
12943 && null_ptr_cst_p (arg
))
12944 return nullptr_node
;
12946 /* [dcl.fct.default]
12948 Local variables shall not be used in default argument
12951 The keyword `this' shall not be used in a default argument of a
12952 member function. */
12953 var
= cp_walk_tree_without_duplicates (&arg
, local_variable_p_walkfn
, NULL
);
12956 if (complain
& tf_warning_or_error
)
12958 if (DECL_NAME (var
) == this_identifier
)
12959 permerror (input_location
, "default argument %qE uses %qD",
12962 error ("default argument %qE uses local variable %qD", arg
, var
);
12964 return error_mark_node
;
12971 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
12974 type_is_deprecated (tree type
)
12976 enum tree_code code
;
12977 if (TREE_DEPRECATED (type
))
12979 if (TYPE_NAME (type
))
12981 if (TREE_DEPRECATED (TYPE_NAME (type
)))
12987 /* Do warn about using typedefs to a deprecated class. */
12988 if (OVERLOAD_TYPE_P (type
) && type
!= TYPE_MAIN_VARIANT (type
))
12989 return type_is_deprecated (TYPE_MAIN_VARIANT (type
));
12991 code
= TREE_CODE (type
);
12993 if (code
== POINTER_TYPE
|| code
== REFERENCE_TYPE
12994 || code
== OFFSET_TYPE
|| code
== FUNCTION_TYPE
12995 || code
== METHOD_TYPE
|| code
== ARRAY_TYPE
)
12996 return type_is_deprecated (TREE_TYPE (type
));
12998 if (TYPE_PTRMEMFUNC_P (type
))
12999 return type_is_deprecated
13000 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type
))));
13005 /* Decode the list of parameter types for a function type.
13006 Given the list of things declared inside the parens,
13007 return a list of types.
13009 If this parameter does not end with an ellipsis, we append
13012 *PARMS is set to the chain of PARM_DECLs created. */
13015 grokparms (tree parmlist
, tree
*parms
)
13017 tree result
= NULL_TREE
;
13018 tree decls
= NULL_TREE
;
13022 for (parm
= parmlist
; parm
!= NULL_TREE
; parm
= TREE_CHAIN (parm
))
13024 tree type
= NULL_TREE
;
13025 tree init
= TREE_PURPOSE (parm
);
13026 tree decl
= TREE_VALUE (parm
);
13028 if (parm
== void_list_node
)
13031 if (! decl
|| TREE_TYPE (decl
) == error_mark_node
)
13034 type
= TREE_TYPE (decl
);
13035 if (VOID_TYPE_P (type
))
13037 if (same_type_p (type
, void_type_node
)
13039 && !DECL_NAME (decl
) && !result
13040 && TREE_CHAIN (parm
) == void_list_node
)
13041 /* DR 577: A parameter list consisting of a single
13042 unnamed parameter of non-dependent type 'void'. */
13044 else if (cv_qualified_p (type
))
13045 error_at (DECL_SOURCE_LOCATION (decl
),
13046 "invalid use of cv-qualified type %qT in "
13047 "parameter declaration", type
);
13049 error_at (DECL_SOURCE_LOCATION (decl
),
13050 "invalid use of type %<void%> in parameter "
13052 /* It's not a good idea to actually create parameters of
13053 type `void'; other parts of the compiler assume that a
13054 void type terminates the parameter list. */
13055 type
= error_mark_node
;
13056 TREE_TYPE (decl
) = error_mark_node
;
13059 if (type
!= error_mark_node
)
13061 if (deprecated_state
!= DEPRECATED_SUPPRESS
)
13063 tree deptype
= type_is_deprecated (type
);
13065 cp_warn_deprecated_use (deptype
);
13068 /* Top-level qualifiers on the parameters are
13069 ignored for function types. */
13070 type
= cp_build_qualified_type (type
, 0);
13071 if (TREE_CODE (type
) == METHOD_TYPE
)
13073 error ("parameter %qD invalidly declared method type", decl
);
13074 type
= build_pointer_type (type
);
13075 TREE_TYPE (decl
) = type
;
13077 else if (abstract_virtuals_error (decl
, type
))
13078 any_error
= 1; /* Seems like a good idea. */
13079 else if (cxx_dialect
< cxx17
&& INDIRECT_TYPE_P (type
))
13081 /* Before C++17 DR 393:
13082 [dcl.fct]/6, parameter types cannot contain pointers
13083 (references) to arrays of unknown bound. */
13084 tree t
= TREE_TYPE (type
);
13085 int ptr
= TYPE_PTR_P (type
);
13089 if (TYPE_PTR_P (t
))
13091 else if (TREE_CODE (t
) != ARRAY_TYPE
)
13093 else if (!TYPE_DOMAIN (t
))
13097 if (TREE_CODE (t
) == ARRAY_TYPE
)
13098 pedwarn (DECL_SOURCE_LOCATION (decl
), OPT_Wpedantic
,
13100 ? G_("parameter %qD includes pointer to array of "
13101 "unknown bound %qT")
13102 : G_("parameter %qD includes reference to array of "
13103 "unknown bound %qT"),
13109 else if (init
&& !processing_template_decl
)
13110 init
= check_default_argument (decl
, init
, tf_warning_or_error
);
13113 DECL_CHAIN (decl
) = decls
;
13115 result
= tree_cons (init
, type
, result
);
13117 decls
= nreverse (decls
);
13118 result
= nreverse (result
);
13120 result
= chainon (result
, void_list_node
);
13127 /* D is a constructor or overloaded `operator='.
13129 Let T be the class in which D is declared. Then, this function
13132 -1 if D's is an ill-formed constructor or copy assignment operator
13133 whose first parameter is of type `T'.
13134 0 if D is not a copy constructor or copy assignment
13136 1 if D is a copy constructor or copy assignment operator whose
13137 first parameter is a reference to non-const qualified T.
13138 2 if D is a copy constructor or copy assignment operator whose
13139 first parameter is a reference to const qualified T.
13141 This function can be used as a predicate. Positive values indicate
13142 a copy constructor and nonzero values indicate a copy assignment
13146 copy_fn_p (const_tree d
)
13152 gcc_assert (DECL_FUNCTION_MEMBER_P (d
));
13154 if (TREE_CODE (d
) == TEMPLATE_DECL
13155 || (DECL_TEMPLATE_INFO (d
)
13156 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d
))))
13157 /* Instantiations of template member functions are never copy
13158 functions. Note that member functions of templated classes are
13159 represented as template functions internally, and we must
13160 accept those as copy functions. */
13163 args
= FUNCTION_FIRST_USER_PARMTYPE (d
);
13167 arg_type
= TREE_VALUE (args
);
13168 if (arg_type
== error_mark_node
)
13171 if (TYPE_MAIN_VARIANT (arg_type
) == DECL_CONTEXT (d
))
13173 /* Pass by value copy assignment operator. */
13176 else if (TYPE_REF_P (arg_type
)
13177 && !TYPE_REF_IS_RVALUE (arg_type
)
13178 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type
)) == DECL_CONTEXT (d
))
13180 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type
)))
13186 args
= TREE_CHAIN (args
);
13188 if (args
&& args
!= void_list_node
&& !TREE_PURPOSE (args
))
13189 /* There are more non-optional args. */
13195 /* D is a constructor or overloaded `operator='.
13197 Let T be the class in which D is declared. Then, this function
13198 returns true when D is a move constructor or move assignment
13199 operator, false otherwise. */
13202 move_fn_p (const_tree d
)
13204 gcc_assert (DECL_FUNCTION_MEMBER_P (d
));
13206 if (cxx_dialect
== cxx98
)
13207 /* There are no move constructors if we are in C++98 mode. */
13210 if (TREE_CODE (d
) == TEMPLATE_DECL
13211 || (DECL_TEMPLATE_INFO (d
)
13212 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d
))))
13213 /* Instantiations of template member functions are never move
13214 functions. Note that member functions of templated classes are
13215 represented as template functions internally, and we must
13216 accept those as move functions. */
13219 return move_signature_fn_p (d
);
13222 /* D is a constructor or overloaded `operator='.
13224 Then, this function returns true when D has the same signature as a move
13225 constructor or move assignment operator (because either it is such a
13226 ctor/op= or it is a template specialization with the same signature),
13227 false otherwise. */
13230 move_signature_fn_p (const_tree d
)
13234 bool result
= false;
13236 args
= FUNCTION_FIRST_USER_PARMTYPE (d
);
13240 arg_type
= TREE_VALUE (args
);
13241 if (arg_type
== error_mark_node
)
13244 if (TYPE_REF_P (arg_type
)
13245 && TYPE_REF_IS_RVALUE (arg_type
)
13246 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type
)),
13250 args
= TREE_CHAIN (args
);
13252 if (args
&& args
!= void_list_node
&& !TREE_PURPOSE (args
))
13253 /* There are more non-optional args. */
13259 /* Remember any special properties of member function DECL. */
13262 grok_special_member_properties (tree decl
)
13266 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl
))
13269 class_type
= DECL_CONTEXT (decl
);
13270 if (IDENTIFIER_CTOR_P (DECL_NAME (decl
)))
13272 int ctor
= copy_fn_p (decl
);
13274 if (!DECL_ARTIFICIAL (decl
))
13275 TYPE_HAS_USER_CONSTRUCTOR (class_type
) = 1;
13281 A non-template constructor for class X is a copy
13282 constructor if its first parameter is of type X&, const
13283 X&, volatile X& or const volatile X&, and either there
13284 are no other parameters or else all other parameters have
13285 default arguments. */
13286 TYPE_HAS_COPY_CTOR (class_type
) = 1;
13287 if (user_provided_p (decl
))
13288 TYPE_HAS_COMPLEX_COPY_CTOR (class_type
) = 1;
13290 TYPE_HAS_CONST_COPY_CTOR (class_type
) = 1;
13292 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl
)))
13293 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type
) = 1;
13294 else if (move_fn_p (decl
) && user_provided_p (decl
))
13295 TYPE_HAS_COMPLEX_MOVE_CTOR (class_type
) = 1;
13296 else if (is_list_ctor (decl
))
13297 TYPE_HAS_LIST_CTOR (class_type
) = 1;
13299 if (DECL_DECLARED_CONSTEXPR_P (decl
)
13300 && !ctor
&& !move_fn_p (decl
))
13301 TYPE_HAS_CONSTEXPR_CTOR (class_type
) = 1;
13303 else if (DECL_NAME (decl
) == assign_op_identifier
)
13307 A non-template assignment operator for class X is a copy
13308 assignment operator if its parameter is of type X, X&, const
13309 X&, volatile X& or const volatile X&. */
13311 int assop
= copy_fn_p (decl
);
13315 TYPE_HAS_COPY_ASSIGN (class_type
) = 1;
13316 if (user_provided_p (decl
))
13317 TYPE_HAS_COMPLEX_COPY_ASSIGN (class_type
) = 1;
13319 TYPE_HAS_CONST_COPY_ASSIGN (class_type
) = 1;
13321 else if (move_fn_p (decl
) && user_provided_p (decl
))
13322 TYPE_HAS_COMPLEX_MOVE_ASSIGN (class_type
) = 1;
13324 else if (IDENTIFIER_CONV_OP_P (DECL_NAME (decl
)))
13325 TYPE_HAS_CONVERSION (class_type
) = true;
13327 /* Destructors are handled in check_methods. */
13330 /* Check a constructor DECL has the correct form. Complains
13331 if the class has a constructor of the form X(X). */
13334 grok_ctor_properties (const_tree ctype
, const_tree decl
)
13336 int ctor_parm
= copy_fn_p (decl
);
13342 A declaration of a constructor for a class X is ill-formed if
13343 its first parameter is of type (optionally cv-qualified) X
13344 and either there are no other parameters or else all other
13345 parameters have default arguments.
13347 We *don't* complain about member template instantiations that
13348 have this form, though; they can occur as we try to decide
13349 what constructor to use during overload resolution. Since
13350 overload resolution will never prefer such a constructor to
13351 the non-template copy constructor (which is either explicitly
13352 or implicitly defined), there's no need to worry about their
13353 existence. Theoretically, they should never even be
13354 instantiated, but that's hard to forestall. */
13355 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
13363 /* DECL is a declaration for an overloaded or conversion operator. If
13364 COMPLAIN is true, errors are issued for invalid declarations. */
13367 grok_op_properties (tree decl
, bool complain
)
13369 tree argtypes
= TYPE_ARG_TYPES (TREE_TYPE (decl
));
13370 bool methodp
= TREE_CODE (TREE_TYPE (decl
)) == METHOD_TYPE
;
13371 tree name
= DECL_NAME (decl
);
13372 location_t loc
= DECL_SOURCE_LOCATION (decl
);
13374 tree class_type
= DECL_CONTEXT (decl
);
13375 if (class_type
&& !CLASS_TYPE_P (class_type
))
13376 class_type
= NULL_TREE
;
13378 tree_code operator_code
;
13380 if (IDENTIFIER_CONV_OP_P (name
))
13382 /* Conversion operators are TYPE_EXPR for the purposes of this
13384 operator_code
= TYPE_EXPR
;
13385 op_flags
= OVL_OP_FLAG_UNARY
;
13389 const ovl_op_info_t
*ovl_op
= IDENTIFIER_OVL_OP_INFO (name
);
13391 operator_code
= ovl_op
->tree_code
;
13392 op_flags
= ovl_op
->flags
;
13393 gcc_checking_assert (operator_code
!= ERROR_MARK
);
13394 DECL_OVERLOADED_OPERATOR_CODE_RAW (decl
) = ovl_op
->ovl_op_code
;
13397 if (op_flags
& OVL_OP_FLAG_ALLOC
)
13399 /* operator new and operator delete are quite special. */
13403 case OVL_OP_FLAG_ALLOC
:
13404 TYPE_HAS_NEW_OPERATOR (class_type
) = 1;
13407 case OVL_OP_FLAG_ALLOC
| OVL_OP_FLAG_DELETE
:
13408 TYPE_GETS_DELETE (class_type
) |= 1;
13411 case OVL_OP_FLAG_ALLOC
| OVL_OP_FLAG_VEC
:
13412 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type
) = 1;
13415 case OVL_OP_FLAG_ALLOC
| OVL_OP_FLAG_DELETE
| OVL_OP_FLAG_VEC
:
13416 TYPE_GETS_DELETE (class_type
) |= 2;
13420 gcc_unreachable ();
13423 /* [basic.std.dynamic.allocation]/1:
13425 A program is ill-formed if an allocation function is declared
13426 in a namespace scope other than global scope or declared
13427 static in global scope.
13429 The same also holds true for deallocation functions. */
13430 if (DECL_NAMESPACE_SCOPE_P (decl
))
13432 if (CP_DECL_CONTEXT (decl
) != global_namespace
)
13434 error_at (loc
, "%qD may not be declared within a namespace",
13439 if (!TREE_PUBLIC (decl
))
13441 error_at (loc
, "%qD may not be declared as static", decl
);
13446 if (op_flags
& OVL_OP_FLAG_DELETE
)
13447 coerce_delete_type (decl
, loc
);
13450 DECL_IS_OPERATOR_NEW (decl
) = 1;
13451 TREE_TYPE (decl
) = coerce_new_type (TREE_TYPE (decl
), loc
);
13457 /* An operator function must either be a non-static member function
13458 or have at least one parameter of a class, a reference to a class,
13459 an enumeration, or a reference to an enumeration. 13.4.0.6 */
13460 if (! methodp
|| DECL_STATIC_FUNCTION_P (decl
))
13462 if (operator_code
== TYPE_EXPR
13463 || operator_code
== CALL_EXPR
13464 || operator_code
== COMPONENT_REF
13465 || operator_code
== ARRAY_REF
13466 || operator_code
== NOP_EXPR
)
13468 error_at (loc
, "%qD must be a nonstatic member function", decl
);
13472 if (DECL_STATIC_FUNCTION_P (decl
))
13474 error_at (loc
, "%qD must be either a non-static member "
13475 "function or a non-member function", decl
);
13479 for (tree arg
= argtypes
; ; arg
= TREE_CHAIN (arg
))
13481 if (!arg
|| arg
== void_list_node
)
13484 error_at(loc
, "%qD must have an argument of class or "
13485 "enumerated type", decl
);
13489 tree type
= non_reference (TREE_VALUE (arg
));
13490 if (type
== error_mark_node
)
13493 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
13494 because these checks are performed even on template
13496 if (MAYBE_CLASS_TYPE_P (type
)
13497 || TREE_CODE (type
) == ENUMERAL_TYPE
)
13502 if (operator_code
== CALL_EXPR
)
13503 /* There are no further restrictions on the arguments to an overloaded
13507 if (operator_code
== COND_EXPR
)
13510 error_at (loc
, "ISO C++ prohibits overloading operator ?:");
13514 /* Count the number of arguments and check for ellipsis. */
13516 for (tree arg
= argtypes
; arg
!= void_list_node
; arg
= TREE_CHAIN (arg
))
13521 error_at (loc
, "%qD must not have variable number of arguments",
13528 /* Verify correct number of arguments. */
13531 case OVL_OP_FLAG_AMBIARY
:
13534 /* We have a unary instance of an ambi-ary op. Remap to the
13536 unsigned alt
= ovl_op_alternate
[ovl_op_mapping
[operator_code
]];
13537 const ovl_op_info_t
*ovl_op
= &ovl_op_info
[false][alt
];
13538 gcc_checking_assert (ovl_op
->flags
== OVL_OP_FLAG_UNARY
);
13539 operator_code
= ovl_op
->tree_code
;
13540 DECL_OVERLOADED_OPERATOR_CODE_RAW (decl
) = ovl_op
->ovl_op_code
;
13542 else if (arity
!= 2)
13544 /* This was an ambiguous operator but is invalid. */
13547 ? G_("%qD must have either zero or one argument")
13548 : G_("%qD must have either one or two arguments"), decl
);
13551 else if ((operator_code
== POSTINCREMENT_EXPR
13552 || operator_code
== POSTDECREMENT_EXPR
)
13553 && ! processing_template_decl
13554 /* x++ and x--'s second argument must be an int. */
13555 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes
)),
13556 integer_type_node
))
13560 ? G_("postfix %qD must have %<int%> as its argument")
13561 : G_("postfix %qD must have %<int%> as its second argument"),
13567 case OVL_OP_FLAG_UNARY
:
13572 ? G_("%qD must have no arguments")
13573 : G_("%qD must have exactly one argument"), decl
);
13578 case OVL_OP_FLAG_BINARY
:
13583 ? G_("%qD must have exactly one argument")
13584 : G_("%qD must have exactly two arguments"), decl
);
13590 gcc_unreachable ();
13593 /* There can be no default arguments. */
13594 for (tree arg
= argtypes
; arg
!= void_list_node
; arg
= TREE_CHAIN (arg
))
13595 if (TREE_PURPOSE (arg
))
13597 TREE_PURPOSE (arg
) = NULL_TREE
;
13598 error_at (loc
, "%qD cannot have default arguments", decl
);
13602 /* At this point the declaration is well-formed. It may not be
13603 sensible though. */
13605 /* Check member function warnings only on the in-class declaration.
13606 There's no point warning on an out-of-class definition. */
13607 if (class_type
&& class_type
!= current_class_type
)
13610 /* Warn about conversion operators that will never be used. */
13611 if (IDENTIFIER_CONV_OP_P (name
)
13612 && ! DECL_TEMPLATE_INFO (decl
)
13613 && warn_class_conversion
)
13615 tree t
= TREE_TYPE (name
);
13616 int ref
= TYPE_REF_P (t
);
13619 t
= TYPE_MAIN_VARIANT (TREE_TYPE (t
));
13621 if (VOID_TYPE_P (t
))
13622 warning_at (loc
, OPT_Wclass_conversion
, "converting %qT to %<void%> "
13623 "will never use a type conversion operator", class_type
);
13624 else if (class_type
)
13626 if (same_type_ignoring_top_level_qualifiers_p (t
, class_type
))
13627 warning_at (loc
, OPT_Wclass_conversion
,
13629 ? G_("converting %qT to a reference to the same type "
13630 "will never use a type conversion operator")
13631 : G_("converting %qT to the same type "
13632 "will never use a type conversion operator"),
13634 /* Don't force t to be complete here. */
13635 else if (MAYBE_CLASS_TYPE_P (t
)
13636 && COMPLETE_TYPE_P (t
)
13637 && DERIVED_FROM_P (t
, class_type
))
13638 warning_at (loc
, OPT_Wclass_conversion
,
13640 ? G_("converting %qT to a reference to a base class "
13641 "%qT will never use a type conversion operator")
13642 : G_("converting %qT to a base class %qT "
13643 "will never use a type conversion operator"),
13651 /* Effective C++ rules below. */
13653 /* More Effective C++ rule 7. */
13654 if (operator_code
== TRUTH_ANDIF_EXPR
13655 || operator_code
== TRUTH_ORIF_EXPR
13656 || operator_code
== COMPOUND_EXPR
)
13657 warning_at (loc
, OPT_Weffc__
,
13658 "user-defined %qD always evaluates both arguments", decl
);
13660 /* More Effective C++ rule 6. */
13661 if (operator_code
== POSTINCREMENT_EXPR
13662 || operator_code
== POSTDECREMENT_EXPR
13663 || operator_code
== PREINCREMENT_EXPR
13664 || operator_code
== PREDECREMENT_EXPR
)
13666 tree arg
= TREE_VALUE (argtypes
);
13667 tree ret
= TREE_TYPE (TREE_TYPE (decl
));
13668 if (methodp
|| TYPE_REF_P (arg
))
13669 arg
= TREE_TYPE (arg
);
13670 arg
= TYPE_MAIN_VARIANT (arg
);
13672 if (operator_code
== PREINCREMENT_EXPR
13673 || operator_code
== PREDECREMENT_EXPR
)
13675 if (!TYPE_REF_P (ret
)
13676 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret
)), arg
))
13677 warning_at (loc
, OPT_Weffc__
, "prefix %qD should return %qT", decl
,
13678 build_reference_type (arg
));
13682 if (!same_type_p (TYPE_MAIN_VARIANT (ret
), arg
))
13683 warning_at (loc
, OPT_Weffc__
,
13684 "postfix %qD should return %qT", decl
, arg
);
13688 /* Effective C++ rule 23. */
13689 if (!DECL_ASSIGNMENT_OPERATOR_P (decl
)
13690 && (operator_code
== PLUS_EXPR
13691 || operator_code
== MINUS_EXPR
13692 || operator_code
== TRUNC_DIV_EXPR
13693 || operator_code
== MULT_EXPR
13694 || operator_code
== TRUNC_MOD_EXPR
)
13695 && TYPE_REF_P (TREE_TYPE (TREE_TYPE (decl
))))
13696 warning_at (loc
, OPT_Weffc__
, "%qD should return by value", decl
);
13701 /* Return a string giving the keyword associate with CODE. */
13703 static const char *
13704 tag_name (enum tag_types code
)
13716 case typename_type
:
13719 gcc_unreachable ();
13723 /* Name lookup in an elaborated-type-specifier (after the keyword
13724 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
13725 elaborated-type-specifier is invalid, issue a diagnostic and return
13726 error_mark_node; otherwise, return the *_TYPE to which it referred.
13727 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
13730 check_elaborated_type_specifier (enum tag_types tag_code
,
13732 bool allow_template_p
)
13738 struct S { struct S *p; };
13740 name lookup will find the TYPE_DECL for the implicit "S::S"
13741 typedef. Adjust for that here. */
13742 if (DECL_SELF_REFERENCE_P (decl
))
13743 decl
= TYPE_NAME (TREE_TYPE (decl
));
13745 type
= TREE_TYPE (decl
);
13747 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
13748 is false for this case as well. */
13749 if (TREE_CODE (type
) == TEMPLATE_TYPE_PARM
)
13751 error ("using template type parameter %qT after %qs",
13752 type
, tag_name (tag_code
));
13753 return error_mark_node
;
13755 /* Accept template template parameters. */
13756 else if (allow_template_p
13757 && (TREE_CODE (type
) == BOUND_TEMPLATE_TEMPLATE_PARM
13758 || TREE_CODE (type
) == TEMPLATE_TEMPLATE_PARM
))
13762 If the identifier resolves to a typedef-name or the
13763 simple-template-id resolves to an alias template
13764 specialization, the elaborated-type-specifier is ill-formed.
13766 In other words, the only legitimate declaration to use in the
13767 elaborated type specifier is the implicit typedef created when
13768 the type is declared. */
13769 else if (!DECL_IMPLICIT_TYPEDEF_P (decl
)
13770 && !DECL_SELF_REFERENCE_P (decl
)
13771 && tag_code
!= typename_type
)
13773 if (alias_template_specialization_p (type
))
13774 error ("using alias template specialization %qT after %qs",
13775 type
, tag_name (tag_code
));
13777 error ("using typedef-name %qD after %qs", decl
, tag_name (tag_code
));
13778 inform (DECL_SOURCE_LOCATION (decl
),
13779 "%qD has a previous declaration here", decl
);
13780 return error_mark_node
;
13782 else if (TREE_CODE (type
) != RECORD_TYPE
13783 && TREE_CODE (type
) != UNION_TYPE
13784 && tag_code
!= enum_type
13785 && tag_code
!= typename_type
)
13787 error ("%qT referred to as %qs", type
, tag_name (tag_code
));
13788 inform (location_of (type
), "%qT has a previous declaration here", type
);
13789 return error_mark_node
;
13791 else if (TREE_CODE (type
) != ENUMERAL_TYPE
13792 && tag_code
== enum_type
)
13794 error ("%qT referred to as enum", type
);
13795 inform (location_of (type
), "%qT has a previous declaration here", type
);
13796 return error_mark_node
;
13798 else if (!allow_template_p
13799 && TREE_CODE (type
) == RECORD_TYPE
13800 && CLASSTYPE_IS_TEMPLATE (type
))
13802 /* If a class template appears as elaborated type specifier
13803 without a template header such as:
13805 template <class T> class C {};
13806 void f(class C); // No template header here
13808 then the required template argument is missing. */
13809 error ("template argument required for %<%s %T%>",
13810 tag_name (tag_code
),
13811 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type
)));
13812 return error_mark_node
;
13818 /* Lookup NAME in elaborate type specifier in scope according to
13819 SCOPE and issue diagnostics if necessary.
13820 Return *_TYPE node upon success, NULL_TREE when the NAME is not
13821 found, and ERROR_MARK_NODE for type error. */
13824 lookup_and_check_tag (enum tag_types tag_code
, tree name
,
13825 tag_scope scope
, bool template_header_p
)
13829 if (scope
== ts_global
)
13831 /* First try ordinary name lookup, ignoring hidden class name
13832 injected via friend declaration. */
13833 decl
= lookup_name_prefer_type (name
, 2);
13834 decl
= strip_using_decl (decl
);
13835 /* If that fails, the name will be placed in the smallest
13836 non-class, non-function-prototype scope according to 3.3.1/5.
13837 We may already have a hidden name declared as friend in this
13838 scope. So lookup again but not ignoring hidden names.
13839 If we find one, that name will be made visible rather than
13840 creating a new tag. */
13842 decl
= lookup_type_scope (name
, ts_within_enclosing_non_class
);
13845 decl
= lookup_type_scope (name
, scope
);
13848 && (DECL_CLASS_TEMPLATE_P (decl
)
13849 /* If scope is ts_current we're defining a class, so ignore a
13850 template template parameter. */
13851 || (scope
!= ts_current
13852 && DECL_TEMPLATE_TEMPLATE_PARM_P (decl
))))
13853 decl
= DECL_TEMPLATE_RESULT (decl
);
13855 if (decl
&& TREE_CODE (decl
) == TYPE_DECL
)
13857 /* Look for invalid nested type:
13861 if (scope
== ts_current
&& DECL_SELF_REFERENCE_P (decl
))
13863 error ("%qD has the same name as the class in which it is "
13866 return error_mark_node
;
13869 /* Two cases we need to consider when deciding if a class
13870 template is allowed as an elaborated type specifier:
13871 1. It is a self reference to its own class.
13872 2. It comes with a template header.
13876 template <class T> class C {
13877 class C *c1; // DECL_SELF_REFERENCE_P is true
13880 template <class U> class C; // template_header_p is true
13881 template <class T> class C<T>::D {
13882 class C *c2; // DECL_SELF_REFERENCE_P is true
13885 t
= check_elaborated_type_specifier (tag_code
,
13888 | DECL_SELF_REFERENCE_P (decl
));
13889 if (template_header_p
&& t
&& CLASS_TYPE_P (t
)
13890 && (!CLASSTYPE_TEMPLATE_INFO (t
)
13891 || (!PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t
)))))
13893 error ("%qT is not a template", t
);
13894 inform (location_of (t
), "previous declaration here");
13895 if (TYPE_CLASS_SCOPE_P (t
)
13896 && CLASSTYPE_TEMPLATE_INFO (TYPE_CONTEXT (t
)))
13897 inform (input_location
,
13898 "perhaps you want to explicitly add %<%T::%>",
13900 t
= error_mark_node
;
13905 else if (decl
&& TREE_CODE (decl
) == TREE_LIST
)
13907 error ("reference to %qD is ambiguous", name
);
13908 print_candidates (decl
);
13909 return error_mark_node
;
13915 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
13916 Define the tag as a forward-reference if it is not defined.
13918 If a declaration is given, process it here, and report an error if
13919 multiple declarations are not identical.
13921 SCOPE is TS_CURRENT when this is also a definition. Only look in
13922 the current frame for the name (since C++ allows new names in any
13923 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
13924 declaration. Only look beginning from the current scope outward up
13925 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
13927 TEMPLATE_HEADER_P is true when this declaration is preceded by
13928 a set of template parameters. */
13931 xref_tag_1 (enum tag_types tag_code
, tree name
,
13932 tag_scope scope
, bool template_header_p
)
13934 enum tree_code code
;
13935 tree context
= NULL_TREE
;
13937 gcc_assert (identifier_p (name
));
13943 code
= RECORD_TYPE
;
13949 code
= ENUMERAL_TYPE
;
13952 gcc_unreachable ();
13955 /* In case of anonymous name, xref_tag is only called to
13956 make type node and push name. Name lookup is not required. */
13957 tree t
= NULL_TREE
;
13958 if (scope
!= ts_lambda
&& !anon_aggrname_p (name
))
13959 t
= lookup_and_check_tag (tag_code
, name
, scope
, template_header_p
);
13961 if (t
== error_mark_node
)
13962 return error_mark_node
;
13964 if (scope
!= ts_current
&& t
&& current_class_type
13965 && template_class_depth (current_class_type
)
13966 && template_header_p
)
13968 if (TREE_CODE (t
) == TEMPLATE_TEMPLATE_PARM
)
13971 /* Since SCOPE is not TS_CURRENT, we are not looking at a
13972 definition of this tag. Since, in addition, we are currently
13973 processing a (member) template declaration of a template
13974 class, we must be very careful; consider:
13976 template <class X> struct S1
13978 template <class U> struct S2
13980 template <class V> friend struct S1;
13983 Here, the S2::S1 declaration should not be confused with the
13984 outer declaration. In particular, the inner version should
13985 have a template parameter of level 2, not level 1.
13987 On the other hand, when presented with:
13989 template <class T> struct S1
13991 template <class U> struct S2 {};
13992 template <class U> friend struct S2;
13995 the friend must find S1::S2 eventually. We accomplish this
13996 by making sure that the new type we create to represent this
13997 declaration has the right TYPE_CONTEXT. */
13998 context
= TYPE_CONTEXT (t
);
14004 /* If no such tag is yet defined, create a forward-reference node
14005 and record it as the "definition".
14006 When a real declaration of this type is found,
14007 the forward-reference will be altered into a real type. */
14008 if (code
== ENUMERAL_TYPE
)
14010 error ("use of enum %q#D without previous declaration", name
);
14011 return error_mark_node
;
14015 t
= make_class_type (code
);
14016 TYPE_CONTEXT (t
) = context
;
14017 if (scope
== ts_lambda
)
14019 /* Mark it as a lambda type. */
14020 CLASSTYPE_LAMBDA_EXPR (t
) = error_mark_node
;
14021 /* And push it into current scope. */
14022 scope
= ts_current
;
14024 t
= pushtag (name
, t
, scope
);
14029 if (template_header_p
&& MAYBE_CLASS_TYPE_P (t
))
14031 /* Check that we aren't trying to overload a class with different
14033 tree constr
= NULL_TREE
;
14034 if (current_template_parms
)
14036 tree reqs
= TEMPLATE_PARMS_CONSTRAINTS (current_template_parms
);
14037 constr
= build_constraints (reqs
, NULL_TREE
);
14039 if (!redeclare_class_template (t
, current_template_parms
, constr
))
14040 return error_mark_node
;
14042 else if (!processing_template_decl
14043 && CLASS_TYPE_P (t
)
14044 && CLASSTYPE_IS_TEMPLATE (t
))
14046 error ("redeclaration of %qT as a non-template", t
);
14047 inform (location_of (t
), "previous declaration %qD", t
);
14048 return error_mark_node
;
14051 if (scope
!= ts_within_enclosing_non_class
&& TYPE_HIDDEN_P (t
))
14053 /* This is no longer an invisible friend. Make it
14055 tree decl
= TYPE_NAME (t
);
14057 DECL_ANTICIPATED (decl
) = false;
14058 DECL_FRIEND_P (decl
) = false;
14060 if (TYPE_TEMPLATE_INFO (t
))
14062 tree tmpl
= TYPE_TI_TEMPLATE (t
);
14063 DECL_ANTICIPATED (tmpl
) = false;
14064 DECL_FRIEND_P (tmpl
) = false;
14072 /* Wrapper for xref_tag_1. */
14075 xref_tag (enum tag_types tag_code
, tree name
,
14076 tag_scope scope
, bool template_header_p
)
14080 subtime
= timevar_cond_start (TV_NAME_LOOKUP
);
14081 ret
= xref_tag_1 (tag_code
, name
, scope
, template_header_p
);
14082 timevar_cond_stop (TV_NAME_LOOKUP
, subtime
);
14088 xref_tag_from_type (tree old
, tree id
, tag_scope scope
)
14090 enum tag_types tag_kind
;
14092 if (TREE_CODE (old
) == RECORD_TYPE
)
14093 tag_kind
= (CLASSTYPE_DECLARED_CLASS (old
) ? class_type
: record_type
);
14095 tag_kind
= union_type
;
14097 if (id
== NULL_TREE
)
14098 id
= TYPE_IDENTIFIER (old
);
14100 return xref_tag (tag_kind
, id
, scope
, false);
14103 /* Create the binfo hierarchy for REF with (possibly NULL) base list
14104 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
14105 access_* node, and the TREE_VALUE is the type of the base-class.
14106 Non-NULL TREE_TYPE indicates virtual inheritance. */
14109 xref_basetypes (tree ref
, tree base_list
)
14112 tree binfo
, base_binfo
;
14113 unsigned max_vbases
= 0; /* Maximum direct & indirect virtual bases. */
14114 unsigned max_bases
= 0; /* Maximum direct bases. */
14115 unsigned max_dvbases
= 0; /* Maximum direct virtual bases. */
14117 tree default_access
;
14118 tree igo_prev
; /* Track Inheritance Graph Order. */
14120 if (ref
== error_mark_node
)
14123 /* The base of a derived class is private by default, all others are
14125 default_access
= (TREE_CODE (ref
) == RECORD_TYPE
14126 && CLASSTYPE_DECLARED_CLASS (ref
)
14127 ? access_private_node
: access_public_node
);
14129 /* First, make sure that any templates in base-classes are
14130 instantiated. This ensures that if we call ourselves recursively
14131 we do not get confused about which classes are marked and which
14133 basep
= &base_list
;
14136 tree basetype
= TREE_VALUE (*basep
);
14138 /* The dependent_type_p call below should really be dependent_scope_p
14139 so that we give a hard error about using an incomplete type as a
14140 base, but we allow it with a pedwarn for backward
14142 if (processing_template_decl
14143 && CLASS_TYPE_P (basetype
) && TYPE_BEING_DEFINED (basetype
))
14144 cxx_incomplete_type_diagnostic (NULL_TREE
, basetype
, DK_PEDWARN
);
14145 if (!dependent_type_p (basetype
)
14146 && !complete_type_or_else (basetype
, NULL
))
14147 /* An incomplete type. Remove it from the list. */
14148 *basep
= TREE_CHAIN (*basep
);
14152 if (TREE_TYPE (*basep
))
14154 if (CLASS_TYPE_P (basetype
))
14155 max_vbases
+= vec_safe_length (CLASSTYPE_VBASECLASSES (basetype
));
14156 basep
= &TREE_CHAIN (*basep
);
14159 max_vbases
+= max_dvbases
;
14161 TYPE_MARKED_P (ref
) = 1;
14163 /* The binfo slot should be empty, unless this is an (ill-formed)
14165 gcc_assert (!TYPE_BINFO (ref
) || TYPE_SIZE (ref
));
14167 gcc_assert (TYPE_MAIN_VARIANT (ref
) == ref
);
14169 binfo
= make_tree_binfo (max_bases
);
14171 TYPE_BINFO (ref
) = binfo
;
14172 BINFO_OFFSET (binfo
) = size_zero_node
;
14173 BINFO_TYPE (binfo
) = ref
;
14175 /* Apply base-class info set up to the variants of this type. */
14176 fixup_type_variants (ref
);
14180 vec_alloc (BINFO_BASE_ACCESSES (binfo
), max_bases
);
14181 /* A C++98 POD cannot have base classes. */
14182 CLASSTYPE_NON_LAYOUT_POD_P (ref
) = true;
14184 if (TREE_CODE (ref
) == UNION_TYPE
)
14186 error ("derived union %qT invalid", ref
);
14192 warning (OPT_Wmultiple_inheritance
,
14193 "%qT defined with multiple direct bases", ref
);
14197 /* An aggregate can't have virtual base classes. */
14198 CLASSTYPE_NON_AGGREGATE (ref
) = true;
14200 vec_alloc (CLASSTYPE_VBASECLASSES (ref
), max_vbases
);
14203 warning (OPT_Wvirtual_inheritance
,
14204 "%qT defined with direct virtual base", ref
);
14207 for (igo_prev
= binfo
; base_list
; base_list
= TREE_CHAIN (base_list
))
14209 tree access
= TREE_PURPOSE (base_list
);
14210 int via_virtual
= TREE_TYPE (base_list
) != NULL_TREE
;
14211 tree basetype
= TREE_VALUE (base_list
);
14213 if (access
== access_default_node
)
14214 access
= default_access
;
14216 /* Before C++17, an aggregate cannot have base classes. In C++17, an
14217 aggregate can't have virtual, private, or protected base classes. */
14218 if (cxx_dialect
< cxx17
14219 || access
!= access_public_node
14221 CLASSTYPE_NON_AGGREGATE (ref
) = true;
14223 if (PACK_EXPANSION_P (basetype
))
14224 basetype
= PACK_EXPANSION_PATTERN (basetype
);
14225 if (TREE_CODE (basetype
) == TYPE_DECL
)
14226 basetype
= TREE_TYPE (basetype
);
14227 if (!MAYBE_CLASS_TYPE_P (basetype
) || TREE_CODE (basetype
) == UNION_TYPE
)
14229 error ("base type %qT fails to be a struct or class type",
14234 base_binfo
= NULL_TREE
;
14235 if (CLASS_TYPE_P (basetype
) && !dependent_scope_p (basetype
))
14237 base_binfo
= TYPE_BINFO (basetype
);
14238 /* The original basetype could have been a typedef'd type. */
14239 basetype
= BINFO_TYPE (base_binfo
);
14241 /* Inherit flags from the base. */
14242 TYPE_HAS_NEW_OPERATOR (ref
)
14243 |= TYPE_HAS_NEW_OPERATOR (basetype
);
14244 TYPE_HAS_ARRAY_NEW_OPERATOR (ref
)
14245 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype
);
14246 TYPE_GETS_DELETE (ref
) |= TYPE_GETS_DELETE (basetype
);
14247 TYPE_HAS_CONVERSION (ref
) |= TYPE_HAS_CONVERSION (basetype
);
14248 CLASSTYPE_DIAMOND_SHAPED_P (ref
)
14249 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype
);
14250 CLASSTYPE_REPEATED_BASE_P (ref
)
14251 |= CLASSTYPE_REPEATED_BASE_P (basetype
);
14254 /* We must do this test after we've seen through a typedef
14256 if (TYPE_MARKED_P (basetype
))
14258 if (basetype
== ref
)
14259 error ("recursive type %qT undefined", basetype
);
14261 error ("duplicate base type %qT invalid", basetype
);
14265 if (PACK_EXPANSION_P (TREE_VALUE (base_list
)))
14266 /* Regenerate the pack expansion for the bases. */
14267 basetype
= make_pack_expansion (basetype
);
14269 TYPE_MARKED_P (basetype
) = 1;
14271 base_binfo
= copy_binfo (base_binfo
, basetype
, ref
,
14272 &igo_prev
, via_virtual
);
14273 if (!BINFO_INHERITANCE_CHAIN (base_binfo
))
14274 BINFO_INHERITANCE_CHAIN (base_binfo
) = binfo
;
14276 BINFO_BASE_APPEND (binfo
, base_binfo
);
14277 BINFO_BASE_ACCESS_APPEND (binfo
, access
);
14281 /* Update max_vbases to reflect the reality that we are dropping
14282 this base: if it reaches zero we want to undo the vec_alloc
14283 above to avoid inconsistencies during error-recovery: eg, in
14284 build_special_member_call, CLASSTYPE_VBASECLASSES non null
14285 and vtt null (c++/27952). */
14288 if (CLASS_TYPE_P (basetype
))
14290 -= vec_safe_length (CLASSTYPE_VBASECLASSES (basetype
));
14293 if (CLASSTYPE_VBASECLASSES (ref
)
14294 && max_vbases
== 0)
14295 vec_free (CLASSTYPE_VBASECLASSES (ref
));
14297 if (vec_safe_length (CLASSTYPE_VBASECLASSES (ref
)) < max_vbases
)
14298 /* If we didn't get max_vbases vbases, we must have shared at
14299 least one of them, and are therefore diamond shaped. */
14300 CLASSTYPE_DIAMOND_SHAPED_P (ref
) = 1;
14302 /* Unmark all the types. */
14303 for (i
= 0; BINFO_BASE_ITERATE (binfo
, i
, base_binfo
); i
++)
14304 TYPE_MARKED_P (BINFO_TYPE (base_binfo
)) = 0;
14305 TYPE_MARKED_P (ref
) = 0;
14307 /* Now see if we have a repeated base type. */
14308 if (!CLASSTYPE_REPEATED_BASE_P (ref
))
14310 for (base_binfo
= binfo
; base_binfo
;
14311 base_binfo
= TREE_CHAIN (base_binfo
))
14313 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo
)))
14315 CLASSTYPE_REPEATED_BASE_P (ref
) = 1;
14318 TYPE_MARKED_P (BINFO_TYPE (base_binfo
)) = 1;
14320 for (base_binfo
= binfo
; base_binfo
;
14321 base_binfo
= TREE_CHAIN (base_binfo
))
14322 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo
)))
14323 TYPE_MARKED_P (BINFO_TYPE (base_binfo
)) = 0;
14330 /* Copies the enum-related properties from type SRC to type DST.
14331 Used with the underlying type of an enum and the enum itself. */
14333 copy_type_enum (tree dst
, tree src
)
14336 for (t
= dst
; t
; t
= TYPE_NEXT_VARIANT (t
))
14338 TYPE_MIN_VALUE (t
) = TYPE_MIN_VALUE (src
);
14339 TYPE_MAX_VALUE (t
) = TYPE_MAX_VALUE (src
);
14340 TYPE_SIZE (t
) = TYPE_SIZE (src
);
14341 TYPE_SIZE_UNIT (t
) = TYPE_SIZE_UNIT (src
);
14342 SET_TYPE_MODE (dst
, TYPE_MODE (src
));
14343 TYPE_PRECISION (t
) = TYPE_PRECISION (src
);
14344 unsigned valign
= TYPE_ALIGN (src
);
14345 if (TYPE_USER_ALIGN (t
))
14346 valign
= MAX (valign
, TYPE_ALIGN (t
));
14348 TYPE_USER_ALIGN (t
) = TYPE_USER_ALIGN (src
);
14349 SET_TYPE_ALIGN (t
, valign
);
14350 TYPE_UNSIGNED (t
) = TYPE_UNSIGNED (src
);
14354 /* Begin compiling the definition of an enumeration type.
14357 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
14359 UNDERLYING_TYPE is the type that will be used as the storage for
14360 the enumeration type. This should be NULL_TREE if no storage type
14363 ATTRIBUTES are any attributes specified after the enum-key.
14365 SCOPED_ENUM_P is true if this is a scoped enumeration type.
14367 if IS_NEW is not NULL, gets TRUE iff a new type is created.
14369 Returns the type object, as yet incomplete.
14370 Also records info about it so that build_enumerator
14371 may be used to declare the individual values as they are read. */
14374 start_enum (tree name
, tree enumtype
, tree underlying_type
,
14375 tree attributes
, bool scoped_enum_p
, bool *is_new
)
14377 tree prevtype
= NULL_TREE
;
14378 gcc_assert (identifier_p (name
));
14382 /* [C++0x dcl.enum]p5:
14384 If not explicitly specified, the underlying type of a scoped
14385 enumeration type is int. */
14386 if (!underlying_type
&& scoped_enum_p
)
14387 underlying_type
= integer_type_node
;
14389 if (underlying_type
)
14390 underlying_type
= cv_unqualified (underlying_type
);
14392 /* If this is the real definition for a previous forward reference,
14393 fill in the contents in the same object that used to be the
14394 forward reference. */
14396 enumtype
= lookup_and_check_tag (enum_type
, name
,
14397 /*tag_scope=*/ts_current
,
14398 /*template_header_p=*/false);
14400 /* In case of a template_decl, the only check that should be deferred
14401 to instantiation time is the comparison of underlying types. */
14402 if (enumtype
&& TREE_CODE (enumtype
) == ENUMERAL_TYPE
)
14404 if (scoped_enum_p
!= SCOPED_ENUM_P (enumtype
))
14406 error_at (input_location
, "scoped/unscoped mismatch "
14407 "in enum %q#T", enumtype
);
14408 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype
)),
14409 "previous definition here");
14410 enumtype
= error_mark_node
;
14412 else if (ENUM_FIXED_UNDERLYING_TYPE_P (enumtype
) != !! underlying_type
)
14414 error_at (input_location
, "underlying type mismatch "
14415 "in enum %q#T", enumtype
);
14416 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype
)),
14417 "previous definition here");
14418 enumtype
= error_mark_node
;
14420 else if (underlying_type
&& ENUM_UNDERLYING_TYPE (enumtype
)
14421 && !same_type_p (underlying_type
,
14422 ENUM_UNDERLYING_TYPE (enumtype
)))
14424 error_at (input_location
, "different underlying type "
14425 "in enum %q#T", enumtype
);
14426 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype
)),
14427 "previous definition here");
14428 underlying_type
= NULL_TREE
;
14432 if (!enumtype
|| TREE_CODE (enumtype
) != ENUMERAL_TYPE
14433 || processing_template_decl
)
14435 /* In case of error, make a dummy enum to allow parsing to
14437 if (enumtype
== error_mark_node
)
14439 name
= make_anon_name ();
14440 enumtype
= NULL_TREE
;
14443 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
14444 of an opaque enum, or an opaque enum of an already defined
14445 enumeration (C++11).
14446 In any other case, it'll be NULL_TREE. */
14452 prevtype
= enumtype
;
14454 /* Do not push the decl more than once. */
14456 || TREE_CODE (enumtype
) != ENUMERAL_TYPE
)
14458 enumtype
= cxx_make_type (ENUMERAL_TYPE
);
14459 enumtype
= pushtag (name
, enumtype
, /*tag_scope=*/ts_current
);
14461 /* std::byte aliases anything. */
14462 if (enumtype
!= error_mark_node
14463 && TYPE_CONTEXT (enumtype
) == std_node
14464 && !strcmp ("byte", TYPE_NAME_STRING (enumtype
)))
14465 TYPE_ALIAS_SET (enumtype
) = 0;
14468 enumtype
= xref_tag (enum_type
, name
, /*tag_scope=*/ts_current
,
14471 if (enumtype
== error_mark_node
)
14472 return error_mark_node
;
14474 /* The enum is considered opaque until the opening '{' of the
14475 enumerator list. */
14476 SET_OPAQUE_ENUM_P (enumtype
, true);
14477 ENUM_FIXED_UNDERLYING_TYPE_P (enumtype
) = !! underlying_type
;
14480 SET_SCOPED_ENUM_P (enumtype
, scoped_enum_p
);
14482 cplus_decl_attributes (&enumtype
, attributes
, (int)ATTR_FLAG_TYPE_IN_PLACE
);
14484 if (underlying_type
)
14486 if (ENUM_UNDERLYING_TYPE (enumtype
))
14487 /* We already checked that it matches, don't change it to a different
14488 typedef variant. */;
14489 else if (CP_INTEGRAL_TYPE_P (underlying_type
))
14491 copy_type_enum (enumtype
, underlying_type
);
14492 ENUM_UNDERLYING_TYPE (enumtype
) = underlying_type
;
14494 else if (dependent_type_p (underlying_type
))
14495 ENUM_UNDERLYING_TYPE (enumtype
) = underlying_type
;
14497 error ("underlying type %qT of %qT must be an integral type",
14498 underlying_type
, enumtype
);
14501 /* If into a template class, the returned enum is always the first
14502 declaration (opaque or not) seen. This way all the references to
14503 this type will be to the same declaration. The following ones are used
14504 only to check for definition errors. */
14505 if (prevtype
&& processing_template_decl
)
14511 /* After processing and defining all the values of an enumeration type,
14512 install their decls in the enumeration type.
14513 ENUMTYPE is the type object. */
14516 finish_enum_value_list (tree enumtype
)
14519 tree underlying_type
;
14522 tree minnode
, maxnode
;
14525 bool fixed_underlying_type_p
14526 = ENUM_UNDERLYING_TYPE (enumtype
) != NULL_TREE
;
14528 /* We built up the VALUES in reverse order. */
14529 TYPE_VALUES (enumtype
) = nreverse (TYPE_VALUES (enumtype
));
14531 /* For an enum defined in a template, just set the type of the values;
14532 all further processing is postponed until the template is
14533 instantiated. We need to set the type so that tsubst of a CONST_DECL
14535 if (processing_template_decl
)
14537 for (values
= TYPE_VALUES (enumtype
);
14539 values
= TREE_CHAIN (values
))
14540 TREE_TYPE (TREE_VALUE (values
)) = enumtype
;
14544 /* Determine the minimum and maximum values of the enumerators. */
14545 if (TYPE_VALUES (enumtype
))
14547 minnode
= maxnode
= NULL_TREE
;
14549 for (values
= TYPE_VALUES (enumtype
);
14551 values
= TREE_CHAIN (values
))
14553 decl
= TREE_VALUE (values
);
14555 /* [dcl.enum]: Following the closing brace of an enum-specifier,
14556 each enumerator has the type of its enumeration. Prior to the
14557 closing brace, the type of each enumerator is the type of its
14558 initializing value. */
14559 TREE_TYPE (decl
) = enumtype
;
14561 /* Update the minimum and maximum values, if appropriate. */
14562 value
= DECL_INITIAL (decl
);
14563 if (value
== error_mark_node
)
14564 value
= integer_zero_node
;
14565 /* Figure out what the minimum and maximum values of the
14566 enumerators are. */
14568 minnode
= maxnode
= value
;
14569 else if (tree_int_cst_lt (maxnode
, value
))
14571 else if (tree_int_cst_lt (value
, minnode
))
14578 If the enumerator-list is empty, the underlying type is as if
14579 the enumeration had a single enumerator with value 0. */
14580 minnode
= maxnode
= integer_zero_node
;
14582 if (!fixed_underlying_type_p
)
14584 /* Compute the number of bits require to represent all values of the
14585 enumeration. We must do this before the type of MINNODE and
14586 MAXNODE are transformed, since tree_int_cst_min_precision relies
14587 on the TREE_TYPE of the value it is passed. */
14588 signop sgn
= tree_int_cst_sgn (minnode
) >= 0 ? UNSIGNED
: SIGNED
;
14589 int lowprec
= tree_int_cst_min_precision (minnode
, sgn
);
14590 int highprec
= tree_int_cst_min_precision (maxnode
, sgn
);
14591 int precision
= MAX (lowprec
, highprec
);
14593 bool use_short_enum
;
14595 /* Determine the underlying type of the enumeration.
14599 The underlying type of an enumeration is an integral type that
14600 can represent all the enumerator values defined in the
14601 enumeration. It is implementation-defined which integral type is
14602 used as the underlying type for an enumeration except that the
14603 underlying type shall not be larger than int unless the value of
14604 an enumerator cannot fit in an int or unsigned int.
14606 We use "int" or an "unsigned int" as the underlying type, even if
14607 a smaller integral type would work, unless the user has
14608 explicitly requested that we use the smallest possible type. The
14609 user can request that for all enumerations with a command line
14610 flag, or for just one enumeration with an attribute. */
14612 use_short_enum
= flag_short_enums
14613 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype
));
14615 /* If the precision of the type was specified with an attribute and it
14616 was too small, give an error. Otherwise, use it. */
14617 if (TYPE_PRECISION (enumtype
))
14619 if (precision
> TYPE_PRECISION (enumtype
))
14620 error ("specified mode too small for enumeral values");
14623 use_short_enum
= true;
14624 precision
= TYPE_PRECISION (enumtype
);
14628 for (itk
= (use_short_enum
? itk_char
: itk_int
);
14632 underlying_type
= integer_types
[itk
];
14633 if (underlying_type
!= NULL_TREE
14634 && TYPE_PRECISION (underlying_type
) >= precision
14635 && TYPE_SIGN (underlying_type
) == sgn
)
14638 if (itk
== itk_none
)
14642 IF no integral type can represent all the enumerator values, the
14643 enumeration is ill-formed. */
14644 error ("no integral type can represent all of the enumerator values "
14645 "for %qT", enumtype
);
14646 precision
= TYPE_PRECISION (long_long_integer_type_node
);
14647 underlying_type
= integer_types
[itk_unsigned_long_long
];
14652 The value of sizeof() applied to an enumeration type, an object
14653 of an enumeration type, or an enumerator, is the value of sizeof()
14654 applied to the underlying type. */
14655 copy_type_enum (enumtype
, underlying_type
);
14657 /* Compute the minimum and maximum values for the type.
14661 For an enumeration where emin is the smallest enumerator and emax
14662 is the largest, the values of the enumeration are the values of the
14663 underlying type in the range bmin to bmax, where bmin and bmax are,
14664 respectively, the smallest and largest values of the smallest bit-
14665 field that can store emin and emax. */
14667 /* The middle-end currently assumes that types with TYPE_PRECISION
14668 narrower than their underlying type are suitably zero or sign
14669 extended to fill their mode. Similarly, it assumes that the front
14670 end assures that a value of a particular type must be within
14671 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
14673 We used to set these fields based on bmin and bmax, but that led
14674 to invalid assumptions like optimizing away bounds checking. So
14675 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
14676 TYPE_MAX_VALUE to the values for the mode above and only restrict
14677 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
14678 ENUM_UNDERLYING_TYPE (enumtype
)
14679 = build_distinct_type_copy (underlying_type
);
14680 TYPE_PRECISION (ENUM_UNDERLYING_TYPE (enumtype
)) = precision
;
14681 set_min_and_max_values_for_integral_type
14682 (ENUM_UNDERLYING_TYPE (enumtype
), precision
, sgn
);
14684 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
14685 if (flag_strict_enums
)
14686 set_min_and_max_values_for_integral_type (enumtype
, precision
, sgn
);
14689 underlying_type
= ENUM_UNDERLYING_TYPE (enumtype
);
14691 /* Convert each of the enumerators to the type of the underlying
14692 type of the enumeration. */
14693 for (values
= TYPE_VALUES (enumtype
); values
; values
= TREE_CHAIN (values
))
14695 location_t saved_location
;
14697 decl
= TREE_VALUE (values
);
14698 saved_location
= input_location
;
14699 input_location
= DECL_SOURCE_LOCATION (decl
);
14700 if (fixed_underlying_type_p
)
14701 /* If the enumeration type has a fixed underlying type, we
14702 already checked all of the enumerator values. */
14703 value
= DECL_INITIAL (decl
);
14705 value
= perform_implicit_conversion (underlying_type
,
14706 DECL_INITIAL (decl
),
14707 tf_warning_or_error
);
14708 input_location
= saved_location
;
14710 /* Do not clobber shared ints. */
14711 if (value
!= error_mark_node
)
14713 value
= copy_node (value
);
14715 TREE_TYPE (value
) = enumtype
;
14717 DECL_INITIAL (decl
) = value
;
14720 /* Fix up all variant types of this enum type. */
14721 for (t
= TYPE_MAIN_VARIANT (enumtype
); t
; t
= TYPE_NEXT_VARIANT (t
))
14722 TYPE_VALUES (t
) = TYPE_VALUES (enumtype
);
14724 if (at_class_scope_p ()
14725 && COMPLETE_TYPE_P (current_class_type
)
14726 && UNSCOPED_ENUM_P (enumtype
))
14728 insert_late_enum_def_bindings (current_class_type
, enumtype
);
14729 /* TYPE_FIELDS needs fixup. */
14730 fixup_type_variants (current_class_type
);
14733 /* Finish debugging output for this type. */
14734 rest_of_type_compilation (enumtype
, namespace_bindings_p ());
14736 /* Each enumerator now has the type of its enumeration. Clear the cache
14737 so that this change in types doesn't confuse us later on. */
14738 clear_cv_and_fold_caches ();
14741 /* Finishes the enum type. This is called only the first time an
14742 enumeration is seen, be it opaque or odinary.
14743 ENUMTYPE is the type object. */
14746 finish_enum (tree enumtype
)
14748 if (processing_template_decl
)
14750 if (at_function_scope_p ())
14751 add_stmt (build_min (TAG_DEFN
, enumtype
));
14755 /* If this is a forward declaration, there should not be any variants,
14756 though we can get a variant in the middle of an enum-specifier with
14757 wacky code like 'enum E { e = sizeof(const E*) };' */
14758 gcc_assert (enumtype
== TYPE_MAIN_VARIANT (enumtype
)
14759 && (TYPE_VALUES (enumtype
)
14760 || !TYPE_NEXT_VARIANT (enumtype
)));
14763 /* Build and install a CONST_DECL for an enumeration constant of the
14764 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
14765 Apply ATTRIBUTES if available. LOC is the location of NAME.
14766 Assignment of sequential values by default is handled here. */
14769 build_enumerator (tree name
, tree value
, tree enumtype
, tree attributes
,
14776 /* scalar_constant_value will pull out this expression, so make sure
14777 it's folded as appropriate. */
14778 if (processing_template_decl
)
14779 value
= fold_non_dependent_expr (value
);
14781 /* If the VALUE was erroneous, pretend it wasn't there; that will
14782 result in the enum being assigned the next value in sequence. */
14783 if (value
== error_mark_node
)
14786 /* Remove no-op casts from the value. */
14788 STRIP_TYPE_NOPS (value
);
14790 if (! processing_template_decl
)
14792 /* Validate and default VALUE. */
14793 if (value
!= NULL_TREE
)
14795 if (!ENUM_UNDERLYING_TYPE (enumtype
))
14797 tree tmp_value
= build_expr_type_conversion (WANT_INT
| WANT_ENUM
,
14802 else if (! INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P
14803 (TREE_TYPE (value
)))
14804 value
= perform_implicit_conversion_flags
14805 (ENUM_UNDERLYING_TYPE (enumtype
), value
, tf_warning_or_error
,
14806 LOOKUP_IMPLICIT
| LOOKUP_NO_NARROWING
);
14808 if (value
== error_mark_node
)
14811 if (value
!= NULL_TREE
)
14813 if (! INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P
14814 (TREE_TYPE (value
)))
14816 error ("enumerator value for %qD must have integral or "
14817 "unscoped enumeration type", name
);
14822 value
= cxx_constant_value (value
);
14824 if (TREE_CODE (value
) != INTEGER_CST
)
14826 error ("enumerator value for %qD is not an integer "
14834 /* Default based on previous value. */
14835 if (value
== NULL_TREE
)
14837 if (TYPE_VALUES (enumtype
))
14841 /* C++03 7.2/4: If no initializer is specified for the first
14842 enumerator, the type is an unspecified integral
14843 type. Otherwise the type is the same as the type of the
14844 initializing value of the preceding enumerator unless the
14845 incremented value is not representable in that type, in
14846 which case the type is an unspecified integral type
14847 sufficient to contain the incremented value. */
14848 prev_value
= DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype
)));
14849 if (error_operand_p (prev_value
))
14850 value
= error_mark_node
;
14853 wi::overflow_type overflowed
;
14854 tree type
= TREE_TYPE (prev_value
);
14855 signop sgn
= TYPE_SIGN (type
);
14856 widest_int wi
= wi::add (wi::to_widest (prev_value
), 1, sgn
,
14860 bool pos
= !wi::neg_p (wi
, sgn
);
14861 if (!wi::fits_to_tree_p (wi
, type
))
14864 for (itk
= itk_int
; itk
!= itk_none
; itk
++)
14866 type
= integer_types
[itk
];
14867 if (type
!= NULL_TREE
14868 && (pos
|| !TYPE_UNSIGNED (type
))
14869 && wi::fits_to_tree_p (wi
, type
))
14872 if (type
&& cxx_dialect
< cxx11
14873 && itk
> itk_unsigned_long
)
14874 pedwarn (input_location
, OPT_Wlong_long
,
14876 incremented enumerator value is too large for %<unsigned long%>") : G_("\
14877 incremented enumerator value is too large for %<long%>"));
14879 if (type
== NULL_TREE
)
14880 overflowed
= wi::OVF_UNKNOWN
;
14882 value
= wide_int_to_tree (type
, wi
);
14887 error ("overflow in enumeration values at %qD", name
);
14888 value
= error_mark_node
;
14893 value
= integer_zero_node
;
14896 /* Remove no-op casts from the value. */
14897 STRIP_TYPE_NOPS (value
);
14899 /* If the underlying type of the enum is fixed, check whether
14900 the enumerator values fits in the underlying type. If it
14901 does not fit, the program is ill-formed [C++0x dcl.enum]. */
14902 if (ENUM_UNDERLYING_TYPE (enumtype
)
14904 && TREE_CODE (value
) == INTEGER_CST
)
14906 if (!int_fits_type_p (value
, ENUM_UNDERLYING_TYPE (enumtype
)))
14907 error ("enumerator value %qE is outside the range of underlying "
14908 "type %qT", value
, ENUM_UNDERLYING_TYPE (enumtype
));
14910 /* Convert the value to the appropriate type. */
14911 value
= fold_convert (ENUM_UNDERLYING_TYPE (enumtype
), value
);
14915 /* C++ associates enums with global, function, or class declarations. */
14916 context
= current_scope ();
14918 /* Build the actual enumeration constant. Note that the enumeration
14919 constants have the underlying type of the enum (if it is fixed)
14920 or the type of their initializer (if the underlying type of the
14921 enum is not fixed):
14925 If the underlying type is fixed, the type of each enumerator
14926 prior to the closing brace is the underlying type; if the
14927 initializing value of an enumerator cannot be represented by
14928 the underlying type, the program is ill-formed. If the
14929 underlying type is not fixed, the type of each enumerator is
14930 the type of its initializing value.
14932 If the underlying type is not fixed, it will be computed by
14933 finish_enum and we will reset the type of this enumerator. Of
14934 course, if we're processing a template, there may be no value. */
14935 type
= value
? TREE_TYPE (value
) : NULL_TREE
;
14937 decl
= build_decl (loc
, CONST_DECL
, name
, type
);
14939 DECL_CONTEXT (decl
) = enumtype
;
14940 TREE_CONSTANT (decl
) = 1;
14941 TREE_READONLY (decl
) = 1;
14942 DECL_INITIAL (decl
) = value
;
14945 cplus_decl_attributes (&decl
, attributes
, 0);
14947 if (context
&& context
== current_class_type
&& !SCOPED_ENUM_P (enumtype
))
14949 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
14950 on the TYPE_FIELDS list for `S'. (That's so that you can say
14951 things like `S::i' later.) */
14953 /* The enumerator may be getting declared outside of its enclosing
14956 class S { public: enum E : int; }; enum S::E : int { i = 7; };
14958 For which case we need to make sure that the access of `S::i'
14959 matches the access of `S::E'. */
14960 tree saved_cas
= current_access_specifier
;
14961 if (TREE_PRIVATE (TYPE_NAME (enumtype
)))
14962 current_access_specifier
= access_private_node
;
14963 else if (TREE_PROTECTED (TYPE_NAME (enumtype
)))
14964 current_access_specifier
= access_protected_node
;
14966 current_access_specifier
= access_public_node
;
14968 finish_member_declaration (decl
);
14970 current_access_specifier
= saved_cas
;
14975 /* Add this enumeration constant to the list for this type. */
14976 TYPE_VALUES (enumtype
) = tree_cons (name
, decl
, TYPE_VALUES (enumtype
));
14979 /* Look for an enumerator with the given NAME within the enumeration
14980 type ENUMTYPE. This routine is used primarily for qualified name
14981 lookup into an enumerator in C++0x, e.g.,
14983 enum class Color { Red, Green, Blue };
14985 Color color = Color::Red;
14987 Returns the value corresponding to the enumerator, or
14988 NULL_TREE if no such enumerator was found. */
14990 lookup_enumerator (tree enumtype
, tree name
)
14993 gcc_assert (enumtype
&& TREE_CODE (enumtype
) == ENUMERAL_TYPE
);
14995 e
= purpose_member (name
, TYPE_VALUES (enumtype
));
14996 return e
? TREE_VALUE (e
) : NULL_TREE
;
15000 /* We're defining DECL. Make sure that its type is OK. */
15003 check_function_type (tree decl
, tree current_function_parms
)
15005 tree fntype
= TREE_TYPE (decl
);
15006 tree return_type
= complete_type (TREE_TYPE (fntype
));
15008 /* In a function definition, arg types must be complete. */
15009 require_complete_types_for_parms (current_function_parms
);
15011 if (dependent_type_p (return_type
)
15012 || type_uses_auto (return_type
))
15014 if (!COMPLETE_OR_VOID_TYPE_P (return_type
))
15016 tree args
= TYPE_ARG_TYPES (fntype
);
15018 error ("return type %q#T is incomplete", return_type
);
15020 /* Make it return void instead. */
15021 if (TREE_CODE (fntype
) == METHOD_TYPE
)
15022 fntype
= build_method_type_directly (TREE_TYPE (TREE_VALUE (args
)),
15024 TREE_CHAIN (args
));
15026 fntype
= build_function_type (void_type_node
, args
);
15027 fntype
= (cp_build_type_attribute_variant
15028 (fntype
, TYPE_ATTRIBUTES (TREE_TYPE (decl
))));
15029 fntype
= cxx_copy_lang_qualifiers (fntype
, TREE_TYPE (decl
));
15030 TREE_TYPE (decl
) = fntype
;
15034 abstract_virtuals_error (decl
, TREE_TYPE (fntype
));
15035 maybe_warn_parm_abi (TREE_TYPE (fntype
),
15036 DECL_SOURCE_LOCATION (decl
));
15040 /* True iff FN is an implicitly-defined default constructor. */
15043 implicit_default_ctor_p (tree fn
)
15045 return (DECL_CONSTRUCTOR_P (fn
)
15046 && !user_provided_p (fn
)
15047 && sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (fn
)));
15050 /* Clobber the contents of *this to let the back end know that the object
15051 storage is dead when we enter the constructor or leave the destructor. */
15054 build_clobber_this ()
15056 /* Clobbering an empty base is pointless, and harmful if its one byte
15057 TYPE_SIZE overlays real data. */
15058 if (is_empty_class (current_class_type
))
15061 /* If we have virtual bases, clobber the whole object, but only if we're in
15062 charge. If we don't have virtual bases, clobber the as-base type so we
15063 don't mess with tail padding. */
15064 bool vbases
= CLASSTYPE_VBASECLASSES (current_class_type
);
15066 tree ctype
= current_class_type
;
15068 ctype
= CLASSTYPE_AS_BASE (ctype
);
15070 tree clobber
= build_clobber (ctype
);
15072 tree thisref
= current_class_ref
;
15073 if (ctype
!= current_class_type
)
15075 thisref
= build_nop (build_reference_type (ctype
), current_class_ptr
);
15076 thisref
= convert_from_reference (thisref
);
15079 tree exprstmt
= build2 (MODIFY_EXPR
, void_type_node
, thisref
, clobber
);
15081 exprstmt
= build_if_in_charge (exprstmt
);
15086 /* Create the FUNCTION_DECL for a function definition.
15087 DECLSPECS and DECLARATOR are the parts of the declaration;
15088 they describe the function's name and the type it returns,
15089 but twisted together in a fashion that parallels the syntax of C.
15091 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
15092 DECLARATOR is really the DECL for the function we are about to
15093 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
15094 indicating that the function is an inline defined in-class.
15096 This function creates a binding context for the function body
15097 as well as setting up the FUNCTION_DECL in current_function_decl.
15099 For C++, we must first check whether that datum makes any sense.
15100 For example, "class A local_a(1,2);" means that variable local_a
15101 is an aggregate of type A, which should have a constructor
15102 applied to it with the argument list [1, 2].
15104 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
15105 or may be a BLOCK if the function has been defined previously
15106 in this translation unit. On exit, DECL_INITIAL (decl1) will be
15107 error_mark_node if the function has never been defined, or
15108 a BLOCK if the function has been defined somewhere. */
15111 start_preparsed_function (tree decl1
, tree attrs
, int flags
)
15113 tree ctype
= NULL_TREE
;
15116 int doing_friend
= 0;
15117 cp_binding_level
*bl
;
15118 tree current_function_parms
;
15119 struct c_fileinfo
*finfo
15120 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1
)));
15121 bool honor_interface
;
15123 /* Sanity check. */
15124 gcc_assert (VOID_TYPE_P (TREE_VALUE (void_list_node
)));
15125 gcc_assert (TREE_CHAIN (void_list_node
) == NULL_TREE
);
15127 fntype
= TREE_TYPE (decl1
);
15128 if (TREE_CODE (fntype
) == METHOD_TYPE
)
15129 ctype
= TYPE_METHOD_BASETYPE (fntype
);
15131 /* ISO C++ 11.4/5. A friend function defined in a class is in
15132 the (lexical) scope of the class in which it is defined. */
15133 if (!ctype
&& DECL_FRIEND_P (decl1
))
15135 ctype
= DECL_FRIEND_CONTEXT (decl1
);
15137 /* CTYPE could be null here if we're dealing with a template;
15138 for example, `inline friend float foo()' inside a template
15139 will have no CTYPE set. */
15140 if (ctype
&& TREE_CODE (ctype
) != RECORD_TYPE
)
15146 if (DECL_DECLARED_INLINE_P (decl1
)
15147 && lookup_attribute ("noinline", attrs
))
15148 warning_at (DECL_SOURCE_LOCATION (decl1
), 0,
15149 "inline function %qD given attribute noinline", decl1
);
15151 /* Handle gnu_inline attribute. */
15152 if (GNU_INLINE_P (decl1
))
15154 DECL_EXTERNAL (decl1
) = 1;
15155 DECL_NOT_REALLY_EXTERN (decl1
) = 0;
15156 DECL_INTERFACE_KNOWN (decl1
) = 1;
15157 DECL_DISREGARD_INLINE_LIMITS (decl1
) = 1;
15160 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1
))
15161 /* This is a constructor, we must ensure that any default args
15162 introduced by this definition are propagated to the clones
15163 now. The clones are used directly in overload resolution. */
15164 adjust_clone_args (decl1
);
15166 /* Sometimes we don't notice that a function is a static member, and
15167 build a METHOD_TYPE for it. Fix that up now. */
15168 gcc_assert (!(ctype
!= NULL_TREE
&& DECL_STATIC_FUNCTION_P (decl1
)
15169 && TREE_CODE (TREE_TYPE (decl1
)) == METHOD_TYPE
));
15171 /* Set up current_class_type, and enter the scope of the class, if
15174 push_nested_class (ctype
);
15175 else if (DECL_STATIC_FUNCTION_P (decl1
))
15176 push_nested_class (DECL_CONTEXT (decl1
));
15178 /* Now that we have entered the scope of the class, we must restore
15179 the bindings for any template parameters surrounding DECL1, if it
15180 is an inline member template. (Order is important; consider the
15181 case where a template parameter has the same name as a field of
15182 the class.) It is not until after this point that
15183 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
15184 if (flags
& SF_INCLASS_INLINE
)
15185 maybe_begin_member_template_processing (decl1
);
15187 /* Effective C++ rule 15. */
15189 && DECL_ASSIGNMENT_OPERATOR_P (decl1
)
15190 && DECL_OVERLOADED_OPERATOR_IS (decl1
, NOP_EXPR
)
15191 && VOID_TYPE_P (TREE_TYPE (fntype
)))
15192 warning (OPT_Weffc__
,
15193 "%<operator=%> should return a reference to %<*this%>");
15195 /* Make the init_value nonzero so pushdecl knows this is not tentative.
15196 error_mark_node is replaced below (in poplevel) with the BLOCK. */
15197 if (!DECL_INITIAL (decl1
))
15198 DECL_INITIAL (decl1
) = error_mark_node
;
15200 /* This function exists in static storage.
15201 (This does not mean `static' in the C sense!) */
15202 TREE_STATIC (decl1
) = 1;
15204 /* We must call push_template_decl after current_class_type is set
15205 up. (If we are processing inline definitions after exiting a
15206 class scope, current_class_type will be NULL_TREE until set above
15207 by push_nested_class.) */
15208 if (processing_template_decl
)
15210 tree newdecl1
= push_template_decl (decl1
);
15211 if (newdecl1
== error_mark_node
)
15213 if (ctype
|| DECL_STATIC_FUNCTION_P (decl1
))
15214 pop_nested_class ();
15220 /* Make sure the parameter and return types are reasonable. When
15221 you declare a function, these types can be incomplete, but they
15222 must be complete when you define the function. */
15223 check_function_type (decl1
, DECL_ARGUMENTS (decl1
));
15225 /* Build the return declaration for the function. */
15226 restype
= TREE_TYPE (fntype
);
15228 if (DECL_RESULT (decl1
) == NULL_TREE
)
15232 resdecl
= build_decl (input_location
, RESULT_DECL
, 0, restype
);
15233 DECL_ARTIFICIAL (resdecl
) = 1;
15234 DECL_IGNORED_P (resdecl
) = 1;
15235 DECL_RESULT (decl1
) = resdecl
;
15237 cp_apply_type_quals_to_decl (cp_type_quals (restype
), resdecl
);
15240 /* Record the decl so that the function name is defined.
15241 If we already have a decl for this name, and it is a FUNCTION_DECL,
15242 use the old decl. */
15243 if (!processing_template_decl
&& !(flags
& SF_PRE_PARSED
))
15245 /* A specialization is not used to guide overload resolution. */
15246 if (!DECL_FUNCTION_MEMBER_P (decl1
)
15247 && !(DECL_USE_TEMPLATE (decl1
) &&
15248 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1
))))
15250 tree olddecl
= pushdecl (decl1
);
15252 if (olddecl
== error_mark_node
)
15253 /* If something went wrong when registering the declaration,
15254 use DECL1; we have to have a FUNCTION_DECL to use when
15255 parsing the body of the function. */
15259 /* Otherwise, OLDDECL is either a previous declaration
15260 of the same function or DECL1 itself. */
15262 if (warn_missing_declarations
15263 && olddecl
== decl1
15264 && !DECL_MAIN_P (decl1
)
15265 && TREE_PUBLIC (decl1
)
15266 && !DECL_DECLARED_INLINE_P (decl1
))
15270 /* Check whether DECL1 is in an anonymous
15272 for (context
= DECL_CONTEXT (decl1
);
15274 context
= DECL_CONTEXT (context
))
15276 if (TREE_CODE (context
) == NAMESPACE_DECL
15277 && DECL_NAME (context
) == NULL_TREE
)
15281 if (context
== NULL
)
15282 warning_at (DECL_SOURCE_LOCATION (decl1
),
15283 OPT_Wmissing_declarations
,
15284 "no previous declaration for %qD", decl1
);
15292 /* We need to set the DECL_CONTEXT. */
15293 if (!DECL_CONTEXT (decl1
) && DECL_TEMPLATE_INFO (decl1
))
15294 DECL_CONTEXT (decl1
) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1
));
15296 fntype
= TREE_TYPE (decl1
);
15297 restype
= TREE_TYPE (fntype
);
15299 /* If #pragma weak applies, mark the decl appropriately now.
15300 The pragma only applies to global functions. Because
15301 determining whether or not the #pragma applies involves
15302 computing the mangled name for the declaration, we cannot
15303 apply the pragma until after we have merged this declaration
15304 with any previous declarations; if the original declaration
15305 has a linkage specification, that specification applies to
15306 the definition as well, and may affect the mangled name. */
15307 if (DECL_FILE_SCOPE_P (decl1
))
15308 maybe_apply_pragma_weak (decl1
);
15311 /* We are now in the scope of the function being defined. */
15312 current_function_decl
= decl1
;
15314 /* Save the parm names or decls from this function's declarator
15315 where store_parm_decls will find them. */
15316 current_function_parms
= DECL_ARGUMENTS (decl1
);
15318 /* Let the user know we're compiling this function. */
15319 announce_function (decl1
);
15321 gcc_assert (DECL_INITIAL (decl1
));
15323 /* This function may already have been parsed, in which case just
15324 return; our caller will skip over the body without parsing. */
15325 if (DECL_INITIAL (decl1
) != error_mark_node
)
15328 /* Initialize RTL machinery. We cannot do this until
15329 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
15330 even when processing a template; this is how we get
15331 CFUN set up, and our per-function variables initialized.
15332 FIXME factor out the non-RTL stuff. */
15333 bl
= current_binding_level
;
15334 allocate_struct_function (decl1
, processing_template_decl
);
15336 /* Initialize the language data structures. Whenever we start
15337 a new function, we destroy temporaries in the usual way. */
15338 cfun
->language
= ggc_cleared_alloc
<language_function
> ();
15339 current_stmt_tree ()->stmts_are_full_exprs_p
= 1;
15340 current_binding_level
= bl
;
15342 if (!processing_template_decl
&& type_uses_auto (restype
))
15344 FNDECL_USED_AUTO (decl1
) = true;
15345 current_function_auto_return_pattern
= restype
;
15348 /* Start the statement-tree, start the tree now. */
15349 DECL_SAVED_TREE (decl1
) = push_stmt_list ();
15351 /* If we are (erroneously) defining a function that we have already
15352 defined before, wipe out what we knew before. */
15353 if (!DECL_PENDING_INLINE_P (decl1
))
15354 DECL_SAVED_FUNCTION_DATA (decl1
) = NULL
;
15356 if (ctype
&& !doing_friend
&& !DECL_STATIC_FUNCTION_P (decl1
))
15358 /* We know that this was set up by `grokclassfn'. We do not
15359 wait until `store_parm_decls', since evil parse errors may
15360 never get us to that point. Here we keep the consistency
15361 between `current_class_type' and `current_class_ptr'. */
15362 tree t
= DECL_ARGUMENTS (decl1
);
15364 gcc_assert (t
!= NULL_TREE
&& TREE_CODE (t
) == PARM_DECL
);
15365 gcc_assert (TYPE_PTR_P (TREE_TYPE (t
)));
15367 cp_function_chain
->x_current_class_ref
15368 = cp_build_fold_indirect_ref (t
);
15369 /* Set this second to avoid shortcut in cp_build_indirect_ref. */
15370 cp_function_chain
->x_current_class_ptr
= t
;
15372 /* Constructors and destructors need to know whether they're "in
15373 charge" of initializing virtual base classes. */
15374 t
= DECL_CHAIN (t
);
15375 if (DECL_HAS_IN_CHARGE_PARM_P (decl1
))
15377 current_in_charge_parm
= t
;
15378 t
= DECL_CHAIN (t
);
15380 if (DECL_HAS_VTT_PARM_P (decl1
))
15382 gcc_assert (DECL_NAME (t
) == vtt_parm_identifier
);
15383 current_vtt_parm
= t
;
15387 honor_interface
= (!DECL_TEMPLATE_INSTANTIATION (decl1
)
15388 /* Implicitly-defined methods (like the
15389 destructor for a class in which no destructor
15390 is explicitly declared) must not be defined
15391 until their definition is needed. So, we
15392 ignore interface specifications for
15393 compiler-generated functions. */
15394 && !DECL_ARTIFICIAL (decl1
));
15396 if (processing_template_decl
)
15397 /* Don't mess with interface flags. */;
15398 else if (DECL_INTERFACE_KNOWN (decl1
))
15400 tree ctx
= decl_function_context (decl1
);
15402 if (DECL_NOT_REALLY_EXTERN (decl1
))
15403 DECL_EXTERNAL (decl1
) = 0;
15405 if (ctx
!= NULL_TREE
&& vague_linkage_p (ctx
))
15406 /* This is a function in a local class in an extern inline
15407 or template function. */
15408 comdat_linkage (decl1
);
15410 /* If this function belongs to an interface, it is public.
15411 If it belongs to someone else's interface, it is also external.
15412 This only affects inlines and template instantiations. */
15413 else if (!finfo
->interface_unknown
&& honor_interface
)
15415 if (DECL_DECLARED_INLINE_P (decl1
)
15416 || DECL_TEMPLATE_INSTANTIATION (decl1
))
15418 DECL_EXTERNAL (decl1
)
15419 = (finfo
->interface_only
15420 || (DECL_DECLARED_INLINE_P (decl1
)
15421 && ! flag_implement_inlines
15422 && !DECL_VINDEX (decl1
)));
15424 /* For WIN32 we also want to put these in linkonce sections. */
15425 maybe_make_one_only (decl1
);
15428 DECL_EXTERNAL (decl1
) = 0;
15429 DECL_INTERFACE_KNOWN (decl1
) = 1;
15430 /* If this function is in an interface implemented in this file,
15431 make sure that the back end knows to emit this function
15433 if (!DECL_EXTERNAL (decl1
))
15434 mark_needed (decl1
);
15436 else if (finfo
->interface_unknown
&& finfo
->interface_only
15437 && honor_interface
)
15439 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
15440 interface, we will have both finfo->interface_unknown and
15441 finfo->interface_only set. In that case, we don't want to
15442 use the normal heuristics because someone will supply a
15443 #pragma implementation elsewhere, and deducing it here would
15444 produce a conflict. */
15445 comdat_linkage (decl1
);
15446 DECL_EXTERNAL (decl1
) = 0;
15447 DECL_INTERFACE_KNOWN (decl1
) = 1;
15448 DECL_DEFER_OUTPUT (decl1
) = 1;
15452 /* This is a definition, not a reference.
15453 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
15454 if (!GNU_INLINE_P (decl1
))
15455 DECL_EXTERNAL (decl1
) = 0;
15457 if ((DECL_DECLARED_INLINE_P (decl1
)
15458 || DECL_TEMPLATE_INSTANTIATION (decl1
))
15459 && ! DECL_INTERFACE_KNOWN (decl1
))
15460 DECL_DEFER_OUTPUT (decl1
) = 1;
15462 DECL_INTERFACE_KNOWN (decl1
) = 1;
15465 /* Determine the ELF visibility attribute for the function. We must not
15466 do this before calling "pushdecl", as we must allow "duplicate_decls"
15467 to merge any attributes appropriately. We also need to wait until
15469 if (!DECL_CLONED_FUNCTION_P (decl1
))
15470 determine_visibility (decl1
);
15472 if (!processing_template_decl
)
15473 maybe_instantiate_noexcept (decl1
);
15475 begin_scope (sk_function_parms
, decl1
);
15479 if (DECL_DESTRUCTOR_P (decl1
)
15480 || (DECL_CONSTRUCTOR_P (decl1
)
15481 && targetm
.cxx
.cdtor_returns_this ()))
15483 cdtor_label
= create_artificial_label (input_location
);
15484 LABEL_DECL_CDTOR (cdtor_label
) = true;
15487 start_fname_decls ();
15489 store_parm_decls (current_function_parms
);
15491 if (!processing_template_decl
15492 && (flag_lifetime_dse
> 1)
15493 && DECL_CONSTRUCTOR_P (decl1
)
15494 && !DECL_CLONED_FUNCTION_P (decl1
)
15495 /* Clobbering an empty base is harmful if it overlays real data. */
15496 && !is_empty_class (current_class_type
)
15497 /* We can't clobber safely for an implicitly-defined default constructor
15498 because part of the initialization might happen before we enter the
15499 constructor, via AGGR_INIT_ZERO_FIRST (c++/68006). */
15500 && !implicit_default_ctor_p (decl1
))
15501 finish_expr_stmt (build_clobber_this ());
15503 if (!processing_template_decl
15504 && DECL_CONSTRUCTOR_P (decl1
)
15505 && sanitize_flags_p (SANITIZE_VPTR
)
15506 && !DECL_CLONED_FUNCTION_P (decl1
)
15507 && !implicit_default_ctor_p (decl1
))
15508 cp_ubsan_maybe_initialize_vtbl_ptrs (current_class_ptr
);
15510 start_lambda_scope (decl1
);
15516 /* Like start_preparsed_function, except that instead of a
15517 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
15519 Returns true on success. If the DECLARATOR is not suitable
15520 for a function, we return false, which tells the parser to
15521 skip the entire function. */
15524 start_function (cp_decl_specifier_seq
*declspecs
,
15525 const cp_declarator
*declarator
,
15530 decl1
= grokdeclarator (declarator
, declspecs
, FUNCDEF
, 1, &attrs
);
15531 invoke_plugin_callbacks (PLUGIN_START_PARSE_FUNCTION
, decl1
);
15532 if (decl1
== error_mark_node
)
15534 /* If the declarator is not suitable for a function definition,
15535 cause a syntax error. */
15536 if (decl1
== NULL_TREE
|| TREE_CODE (decl1
) != FUNCTION_DECL
)
15538 error ("invalid function declaration");
15542 if (DECL_MAIN_P (decl1
))
15543 /* main must return int. grokfndecl should have corrected it
15544 (and issued a diagnostic) if the user got it wrong. */
15545 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1
)),
15546 integer_type_node
));
15548 return start_preparsed_function (decl1
, attrs
, /*flags=*/SF_DEFAULT
);
15551 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
15555 use_eh_spec_block (tree fn
)
15557 return (flag_exceptions
&& flag_enforce_eh_specs
15558 && !processing_template_decl
15559 && !type_throw_all_p (TREE_TYPE (fn
))
15560 /* We insert the EH_SPEC_BLOCK only in the original
15561 function; then, it is copied automatically to the
15563 && !DECL_CLONED_FUNCTION_P (fn
)
15564 /* Implicitly-generated constructors and destructors have
15565 exception specifications. However, those specifications
15566 are the union of the possible exceptions specified by the
15567 constructors/destructors for bases and members, so no
15568 unallowed exception will ever reach this function. By
15569 not creating the EH_SPEC_BLOCK we save a little memory,
15570 and we avoid spurious warnings about unreachable
15572 && !DECL_DEFAULTED_FN (fn
));
15575 /* Store the parameter declarations into the current function declaration.
15576 This is called after parsing the parameter declarations, before
15577 digesting the body of the function.
15579 Also install to binding contour return value identifier, if any. */
15582 store_parm_decls (tree current_function_parms
)
15584 tree fndecl
= current_function_decl
;
15587 /* This is a chain of any other decls that came in among the parm
15588 declarations. If a parm is declared with enum {foo, bar} x;
15589 then CONST_DECLs for foo and bar are put here. */
15590 tree nonparms
= NULL_TREE
;
15592 if (current_function_parms
)
15594 /* This case is when the function was defined with an ANSI prototype.
15595 The parms already have decls, so we need not do anything here
15596 except record them as in effect
15597 and complain if any redundant old-style parm decls were written. */
15599 tree specparms
= current_function_parms
;
15602 /* Must clear this because it might contain TYPE_DECLs declared
15604 current_binding_level
->names
= NULL
;
15606 /* If we're doing semantic analysis, then we'll call pushdecl
15607 for each of these. We must do them in reverse order so that
15608 they end in the correct forward order. */
15609 specparms
= nreverse (specparms
);
15611 for (parm
= specparms
; parm
; parm
= next
)
15613 next
= DECL_CHAIN (parm
);
15614 if (TREE_CODE (parm
) == PARM_DECL
)
15618 /* If we find an enum constant or a type tag,
15619 put it aside for the moment. */
15620 TREE_CHAIN (parm
) = NULL_TREE
;
15621 nonparms
= chainon (nonparms
, parm
);
15625 /* Get the decls in their original chain order and record in the
15626 function. This is all and only the PARM_DECLs that were
15627 pushed into scope by the loop above. */
15628 DECL_ARGUMENTS (fndecl
) = get_local_decls ();
15631 DECL_ARGUMENTS (fndecl
) = NULL_TREE
;
15633 /* Now store the final chain of decls for the arguments
15634 as the decl-chain of the current lexical scope.
15635 Put the enumerators in as well, at the front so that
15636 DECL_ARGUMENTS is not modified. */
15637 current_binding_level
->names
= chainon (nonparms
, DECL_ARGUMENTS (fndecl
));
15639 if (use_eh_spec_block (current_function_decl
))
15640 current_eh_spec_block
= begin_eh_spec_block ();
15644 /* We have finished doing semantic analysis on DECL, but have not yet
15645 generated RTL for its body. Save away our current state, so that
15646 when we want to generate RTL later we know what to do. */
15649 save_function_data (tree decl
)
15651 struct language_function
*f
;
15653 /* Save the language-specific per-function data so that we can
15654 get it back when we really expand this function. */
15655 gcc_assert (!DECL_PENDING_INLINE_P (decl
));
15658 f
= ggc_alloc
<language_function
> ();
15659 memcpy (f
, cp_function_chain
, sizeof (struct language_function
));
15660 DECL_SAVED_FUNCTION_DATA (decl
) = f
;
15662 /* Clear out the bits we don't need. */
15663 f
->base
.x_stmt_tree
.x_cur_stmt_list
= NULL
;
15664 f
->bindings
= NULL
;
15665 f
->base
.local_typedefs
= NULL
;
15669 /* Set the return value of the constructor (if present). */
15672 finish_constructor_body (void)
15677 if (targetm
.cxx
.cdtor_returns_this ())
15679 /* Any return from a constructor will end up here. */
15680 add_stmt (build_stmt (input_location
, LABEL_EXPR
, cdtor_label
));
15682 val
= DECL_ARGUMENTS (current_function_decl
);
15683 val
= build2 (MODIFY_EXPR
, TREE_TYPE (val
),
15684 DECL_RESULT (current_function_decl
), val
);
15685 /* Return the address of the object. */
15686 exprstmt
= build_stmt (input_location
, RETURN_EXPR
, val
);
15687 add_stmt (exprstmt
);
15691 /* Do all the processing for the beginning of a destructor; set up the
15692 vtable pointers and cleanups for bases and members. */
15695 begin_destructor_body (void)
15697 tree compound_stmt
;
15699 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
15700 issued an error message. We still want to try to process the
15701 body of the function, but initialize_vtbl_ptrs will crash if
15702 TYPE_BINFO is NULL. */
15703 if (COMPLETE_TYPE_P (current_class_type
))
15705 compound_stmt
= begin_compound_stmt (0);
15706 /* Make all virtual function table pointers in non-virtual base
15707 classes point to CURRENT_CLASS_TYPE's virtual function
15709 initialize_vtbl_ptrs (current_class_ptr
);
15710 finish_compound_stmt (compound_stmt
);
15712 if (flag_lifetime_dse
15713 /* Clobbering an empty base is harmful if it overlays real data. */
15714 && !is_empty_class (current_class_type
))
15716 if (sanitize_flags_p (SANITIZE_VPTR
)
15717 && (flag_sanitize_recover
& SANITIZE_VPTR
) == 0
15718 && TYPE_CONTAINS_VPTR_P (current_class_type
))
15720 tree binfo
= TYPE_BINFO (current_class_type
);
15722 = cp_build_fold_indirect_ref (current_class_ptr
);
15724 tree vtbl_ptr
= build_vfield_ref (ref
, TREE_TYPE (binfo
));
15725 tree vtbl
= build_zero_cst (TREE_TYPE (vtbl_ptr
));
15726 tree stmt
= cp_build_modify_expr (input_location
, vtbl_ptr
,
15728 tf_warning_or_error
);
15729 /* If the vptr is shared with some virtual nearly empty base,
15730 don't clear it if not in charge, the dtor of the virtual
15731 nearly empty base will do that later. */
15732 if (CLASSTYPE_VBASECLASSES (current_class_type
)
15733 && CLASSTYPE_PRIMARY_BINFO (current_class_type
)
15735 (CLASSTYPE_PRIMARY_BINFO (current_class_type
)))
15737 stmt
= convert_to_void (stmt
, ICV_STATEMENT
,
15738 tf_warning_or_error
);
15739 stmt
= build_if_in_charge (stmt
);
15741 finish_decl_cleanup (NULL_TREE
, stmt
);
15744 finish_decl_cleanup (NULL_TREE
, build_clobber_this ());
15747 /* And insert cleanups for our bases and members so that they
15748 will be properly destroyed if we throw. */
15749 push_base_cleanups ();
15753 /* At the end of every destructor we generate code to delete the object if
15754 necessary. Do that now. */
15757 finish_destructor_body (void)
15761 /* Any return from a destructor will end up here; that way all base
15762 and member cleanups will be run when the function returns. */
15763 add_stmt (build_stmt (input_location
, LABEL_EXPR
, cdtor_label
));
15765 if (targetm
.cxx
.cdtor_returns_this ())
15769 val
= DECL_ARGUMENTS (current_function_decl
);
15770 val
= build2 (MODIFY_EXPR
, TREE_TYPE (val
),
15771 DECL_RESULT (current_function_decl
), val
);
15772 /* Return the address of the object. */
15773 exprstmt
= build_stmt (input_location
, RETURN_EXPR
, val
);
15774 add_stmt (exprstmt
);
15778 /* Do the necessary processing for the beginning of a function body, which
15779 in this case includes member-initializers, but not the catch clauses of
15780 a function-try-block. Currently, this means opening a binding level
15781 for the member-initializers (in a ctor), member cleanups (in a dtor),
15782 and capture proxies (in a lambda operator()). */
15785 begin_function_body (void)
15789 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl
))
15792 if (processing_template_decl
)
15793 /* Do nothing now. */;
15795 /* Always keep the BLOCK node associated with the outermost pair of
15796 curly braces of a function. These are needed for correct
15797 operation of dwarfout.c. */
15798 keep_next_level (true);
15800 stmt
= begin_compound_stmt (BCS_FN_BODY
);
15802 if (processing_template_decl
)
15803 /* Do nothing now. */;
15804 else if (DECL_DESTRUCTOR_P (current_function_decl
))
15805 begin_destructor_body ();
15810 /* Do the processing for the end of a function body. Currently, this means
15811 closing out the cleanups for fully-constructed bases and members, and in
15812 the case of the destructor, deleting the object if desired. Again, this
15813 is only meaningful for [cd]tors, since they are the only functions where
15814 there is a significant distinction between the main body and any
15815 function catch clauses. Handling, say, main() return semantics here
15816 would be wrong, as flowing off the end of a function catch clause for
15817 main() would also need to return 0. */
15820 finish_function_body (tree compstmt
)
15822 if (compstmt
== NULL_TREE
)
15825 /* Close the block. */
15826 finish_compound_stmt (compstmt
);
15828 if (processing_template_decl
)
15829 /* Do nothing now. */;
15830 else if (DECL_CONSTRUCTOR_P (current_function_decl
))
15831 finish_constructor_body ();
15832 else if (DECL_DESTRUCTOR_P (current_function_decl
))
15833 finish_destructor_body ();
15836 /* Given a function, returns the BLOCK corresponding to the outermost level
15837 of curly braces, skipping the artificial block created for constructor
15841 outer_curly_brace_block (tree fndecl
)
15843 tree block
= DECL_INITIAL (fndecl
);
15844 if (BLOCK_OUTER_CURLY_BRACE_P (block
))
15846 block
= BLOCK_SUBBLOCKS (block
);
15847 if (BLOCK_OUTER_CURLY_BRACE_P (block
))
15849 block
= BLOCK_SUBBLOCKS (block
);
15850 gcc_assert (BLOCK_OUTER_CURLY_BRACE_P (block
));
15854 /* If FNDECL is a class's key method, add the class to the list of
15855 keyed classes that should be emitted. */
15858 record_key_method_defined (tree fndecl
)
15860 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl
)
15861 && DECL_VIRTUAL_P (fndecl
)
15862 && !processing_template_decl
)
15864 tree fnclass
= DECL_CONTEXT (fndecl
);
15865 if (fndecl
== CLASSTYPE_KEY_METHOD (fnclass
))
15866 vec_safe_push (keyed_classes
, fnclass
);
15870 /* Subroutine of finish_function.
15871 Save the body of constexpr functions for possible
15872 future compile time evaluation. */
15875 maybe_save_function_definition (tree fun
)
15877 if (!processing_template_decl
15878 && DECL_DECLARED_CONSTEXPR_P (fun
)
15879 && !cp_function_chain
->invalid_constexpr
15880 && !DECL_CLONED_FUNCTION_P (fun
))
15881 register_constexpr_fundef (fun
, DECL_SAVED_TREE (fun
));
15884 /* Attempt to add a fix-it hint to RICHLOC suggesting the insertion
15885 of "return *this;" immediately before its location, using FNDECL's
15886 first statement (if any) to give the indentation, if appropriate. */
15889 add_return_star_this_fixit (gcc_rich_location
*richloc
, tree fndecl
)
15891 location_t indent
= UNKNOWN_LOCATION
;
15892 tree stmts
= expr_first (DECL_SAVED_TREE (fndecl
));
15894 indent
= EXPR_LOCATION (stmts
);
15895 richloc
->add_fixit_insert_formatted ("return *this;",
15896 richloc
->get_loc (),
15900 /* Finish up a function declaration and compile that function
15901 all the way to assembler language output. The free the storage
15902 for the function definition. INLINE_P is TRUE if we just
15903 finished processing the body of an in-class inline function
15904 definition. (This processing will have taken place after the
15905 class definition is complete.) */
15908 finish_function (bool inline_p
)
15910 tree fndecl
= current_function_decl
;
15911 tree fntype
, ctype
= NULL_TREE
;
15913 /* When we get some parse errors, we can end up without a
15914 current_function_decl, so cope. */
15915 if (fndecl
== NULL_TREE
)
15916 return error_mark_node
;
15918 finish_lambda_scope ();
15920 if (c_dialect_objc ())
15921 objc_finish_function ();
15923 record_key_method_defined (fndecl
);
15925 fntype
= TREE_TYPE (fndecl
);
15927 /* TREE_READONLY (fndecl) = 1;
15928 This caused &foo to be of type ptr-to-const-function
15929 which then got a warning when stored in a ptr-to-function variable. */
15931 gcc_assert (building_stmt_list_p ());
15932 /* The current function is being defined, so its DECL_INITIAL should
15933 be set, and unless there's a multiple definition, it should be
15934 error_mark_node. */
15935 gcc_assert (DECL_INITIAL (fndecl
) == error_mark_node
);
15937 /* For a cloned function, we've already got all the code we need;
15938 there's no need to add any extra bits. */
15939 if (!DECL_CLONED_FUNCTION_P (fndecl
))
15941 /* Make it so that `main' always returns 0 by default. */
15942 if (DECL_MAIN_P (current_function_decl
))
15943 finish_return_stmt (integer_zero_node
);
15945 if (use_eh_spec_block (current_function_decl
))
15946 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
15947 (TREE_TYPE (current_function_decl
)),
15948 current_eh_spec_block
);
15951 /* If we're saving up tree structure, tie off the function now. */
15952 DECL_SAVED_TREE (fndecl
) = pop_stmt_list (DECL_SAVED_TREE (fndecl
));
15954 finish_fname_decls ();
15956 /* If this function can't throw any exceptions, remember that. */
15957 if (!processing_template_decl
15958 && !cp_function_chain
->can_throw
15959 && !flag_non_call_exceptions
15960 && !decl_replaceable_p (fndecl
))
15961 TREE_NOTHROW (fndecl
) = 1;
15963 /* This must come after expand_function_end because cleanups might
15964 have declarations (from inline functions) that need to go into
15965 this function's blocks. */
15967 /* If the current binding level isn't the outermost binding level
15968 for this function, either there is a bug, or we have experienced
15969 syntax errors and the statement tree is malformed. */
15970 if (current_binding_level
->kind
!= sk_function_parms
)
15972 /* Make sure we have already experienced errors. */
15973 gcc_assert (errorcount
);
15975 /* Throw away the broken statement tree and extra binding
15977 DECL_SAVED_TREE (fndecl
) = alloc_stmt_list ();
15979 while (current_binding_level
->kind
!= sk_function_parms
)
15981 if (current_binding_level
->kind
== sk_class
)
15982 pop_nested_class ();
15984 poplevel (0, 0, 0);
15987 poplevel (1, 0, 1);
15989 /* Statements should always be full-expressions at the outermost set
15990 of curly braces for a function. */
15991 gcc_assert (stmts_are_full_exprs_p ());
15993 /* If there are no return statements in a function with auto return type,
15994 the return type is void. But if the declared type is something like
15995 auto*, this is an error. */
15996 if (!processing_template_decl
&& FNDECL_USED_AUTO (fndecl
)
15997 && TREE_TYPE (fntype
) == current_function_auto_return_pattern
)
15999 if (is_auto (current_function_auto_return_pattern
))
16001 apply_deduced_return_type (fndecl
, void_type_node
);
16002 fntype
= TREE_TYPE (fndecl
);
16004 else if (!current_function_returns_value
16005 && !current_function_returns_null
)
16007 error ("no return statements in function returning %qT",
16008 current_function_auto_return_pattern
);
16009 inform (input_location
, "only plain %<auto%> return type can be "
16010 "deduced to %<void%>");
16014 // If this is a concept, check that the definition is reasonable.
16015 if (DECL_DECLARED_CONCEPT_P (fndecl
))
16016 check_function_concept (fndecl
);
16018 /* Lambda closure members are implicitly constexpr if possible. */
16019 if (cxx_dialect
>= cxx17
16020 && LAMBDA_TYPE_P (CP_DECL_CONTEXT (fndecl
)))
16021 DECL_DECLARED_CONSTEXPR_P (fndecl
)
16022 = ((processing_template_decl
16023 || is_valid_constexpr_fn (fndecl
, /*complain*/false))
16024 && potential_constant_expression (DECL_SAVED_TREE (fndecl
)));
16026 /* Save constexpr function body before it gets munged by
16027 the NRV transformation. */
16028 maybe_save_function_definition (fndecl
);
16030 /* Invoke the pre-genericize plugin before we start munging things. */
16031 if (!processing_template_decl
)
16032 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE
, fndecl
);
16034 /* Perform delayed folding before NRV transformation. */
16035 if (!processing_template_decl
)
16036 cp_fold_function (fndecl
);
16038 /* Set up the named return value optimization, if we can. Candidate
16039 variables are selected in check_return_expr. */
16040 if (current_function_return_value
)
16042 tree r
= current_function_return_value
;
16045 if (r
!= error_mark_node
16046 /* This is only worth doing for fns that return in memory--and
16047 simpler, since we don't have to worry about promoted modes. */
16048 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl
)), fndecl
)
16049 /* Only allow this for variables declared in the outer scope of
16050 the function so we know that their lifetime always ends with a
16051 return; see g++.dg/opt/nrv6.C. We could be more flexible if
16052 we were to do this optimization in tree-ssa. */
16053 && (outer
= outer_curly_brace_block (fndecl
))
16054 && chain_member (r
, BLOCK_VARS (outer
)))
16055 finalize_nrv (&DECL_SAVED_TREE (fndecl
), r
, DECL_RESULT (fndecl
));
16057 current_function_return_value
= NULL_TREE
;
16060 /* Remember that we were in class scope. */
16061 if (current_class_name
)
16062 ctype
= current_class_type
;
16064 /* Must mark the RESULT_DECL as being in this function. */
16065 DECL_CONTEXT (DECL_RESULT (fndecl
)) = fndecl
;
16067 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
16068 to the FUNCTION_DECL node itself. */
16069 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl
)) = fndecl
;
16071 /* Save away current state, if appropriate. */
16072 if (!processing_template_decl
)
16073 save_function_data (fndecl
);
16075 /* Complain if there's just no return statement. */
16076 if (warn_return_type
16077 && !VOID_TYPE_P (TREE_TYPE (fntype
))
16078 && !dependent_type_p (TREE_TYPE (fntype
))
16079 && !current_function_returns_value
&& !current_function_returns_null
16080 /* Don't complain if we abort or throw. */
16081 && !current_function_returns_abnormally
16082 /* Don't complain if there's an infinite loop. */
16083 && !current_function_infinite_loop
16084 /* Don't complain if we are declared noreturn. */
16085 && !TREE_THIS_VOLATILE (fndecl
)
16086 && !DECL_NAME (DECL_RESULT (fndecl
))
16087 && !TREE_NO_WARNING (fndecl
)
16088 /* Structor return values (if any) are set by the compiler. */
16089 && !DECL_CONSTRUCTOR_P (fndecl
)
16090 && !DECL_DESTRUCTOR_P (fndecl
)
16091 && targetm
.warn_func_return (fndecl
))
16093 gcc_rich_location
richloc (input_location
);
16094 /* Potentially add a "return *this;" fix-it hint for
16095 assignment operators. */
16096 if (IDENTIFIER_ASSIGN_OP_P (DECL_NAME (fndecl
)))
16098 tree valtype
= TREE_TYPE (DECL_RESULT (fndecl
));
16099 if (TREE_CODE (valtype
) == REFERENCE_TYPE
16100 && current_class_ref
16101 && same_type_ignoring_top_level_qualifiers_p
16102 (TREE_TYPE (valtype
), TREE_TYPE (current_class_ref
))
16103 && global_dc
->option_enabled (OPT_Wreturn_type
,
16104 global_dc
->option_state
))
16105 add_return_star_this_fixit (&richloc
, fndecl
);
16107 warning_at (&richloc
, OPT_Wreturn_type
,
16108 "no return statement in function returning non-void");
16109 TREE_NO_WARNING (fndecl
) = 1;
16112 /* Store the end of the function, so that we get good line number
16113 info for the epilogue. */
16114 cfun
->function_end_locus
= input_location
;
16116 /* Complain about parameters that are only set, but never otherwise used. */
16117 if (warn_unused_but_set_parameter
16118 && !processing_template_decl
16119 && errorcount
== unused_but_set_errorcount
16120 && !DECL_CLONED_FUNCTION_P (fndecl
))
16124 for (decl
= DECL_ARGUMENTS (fndecl
);
16126 decl
= DECL_CHAIN (decl
))
16127 if (TREE_USED (decl
)
16128 && TREE_CODE (decl
) == PARM_DECL
16129 && !DECL_READ_P (decl
)
16130 && DECL_NAME (decl
)
16131 && !DECL_ARTIFICIAL (decl
)
16132 && !TREE_NO_WARNING (decl
)
16133 && !DECL_IN_SYSTEM_HEADER (decl
)
16134 && TREE_TYPE (decl
) != error_mark_node
16135 && !TYPE_REF_P (TREE_TYPE (decl
))
16136 && (!CLASS_TYPE_P (TREE_TYPE (decl
))
16137 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl
))))
16138 warning_at (DECL_SOURCE_LOCATION (decl
),
16139 OPT_Wunused_but_set_parameter
,
16140 "parameter %qD set but not used", decl
);
16141 unused_but_set_errorcount
= errorcount
;
16144 /* Complain about locally defined typedefs that are not used in this
16146 maybe_warn_unused_local_typedefs ();
16148 /* Possibly warn about unused parameters. */
16149 if (warn_unused_parameter
16150 && !processing_template_decl
16151 && !DECL_CLONED_FUNCTION_P (fndecl
))
16152 do_warn_unused_parameter (fndecl
);
16154 /* Genericize before inlining. */
16155 if (!processing_template_decl
)
16157 struct language_function
*f
= DECL_SAVED_FUNCTION_DATA (fndecl
);
16158 cp_genericize (fndecl
);
16159 /* Clear out the bits we don't need. */
16160 f
->x_current_class_ptr
= NULL
;
16161 f
->x_current_class_ref
= NULL
;
16162 f
->x_eh_spec_block
= NULL
;
16163 f
->x_in_charge_parm
= NULL
;
16164 f
->x_vtt_parm
= NULL
;
16165 f
->x_return_value
= NULL
;
16166 f
->bindings
= NULL
;
16167 f
->extern_decl_map
= NULL
;
16168 f
->infinite_loops
= NULL
;
16171 /* We're leaving the context of this function, so zap cfun. It's still in
16172 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
16174 current_function_decl
= NULL
;
16176 /* If this is an in-class inline definition, we may have to pop the
16177 bindings for the template parameters that we added in
16178 maybe_begin_member_template_processing when start_function was
16181 maybe_end_member_template_processing ();
16183 /* Leave the scope of the class. */
16185 pop_nested_class ();
16190 current_function_decl
= NULL_TREE
;
16192 invoke_plugin_callbacks (PLUGIN_FINISH_PARSE_FUNCTION
, fndecl
);
16196 /* Create the FUNCTION_DECL for a function definition.
16197 DECLSPECS and DECLARATOR are the parts of the declaration;
16198 they describe the return type and the name of the function,
16199 but twisted together in a fashion that parallels the syntax of C.
16201 This function creates a binding context for the function body
16202 as well as setting up the FUNCTION_DECL in current_function_decl.
16204 Returns a FUNCTION_DECL on success.
16206 If the DECLARATOR is not suitable for a function (it defines a datum
16207 instead), we return 0, which tells yyparse to report a parse error.
16209 May return void_type_node indicating that this method is actually
16210 a friend. See grokfield for more details.
16212 Came here with a `.pushlevel' .
16214 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
16215 CHANGES TO CODE IN `grokfield'. */
16218 grokmethod (cp_decl_specifier_seq
*declspecs
,
16219 const cp_declarator
*declarator
, tree attrlist
)
16221 tree fndecl
= grokdeclarator (declarator
, declspecs
, MEMFUNCDEF
, 0,
16224 if (fndecl
== error_mark_node
)
16225 return error_mark_node
;
16227 if (fndecl
== NULL
|| TREE_CODE (fndecl
) != FUNCTION_DECL
)
16229 error ("invalid member function declaration");
16230 return error_mark_node
;
16234 cplus_decl_attributes (&fndecl
, attrlist
, 0);
16236 /* Pass friends other than inline friend functions back. */
16237 if (fndecl
== void_type_node
)
16240 if (DECL_IN_AGGR_P (fndecl
))
16242 if (DECL_CLASS_SCOPE_P (fndecl
))
16243 error ("%qD is already defined in class %qT", fndecl
,
16244 DECL_CONTEXT (fndecl
));
16245 return error_mark_node
;
16248 check_template_shadow (fndecl
);
16250 if (TREE_PUBLIC (fndecl
))
16251 DECL_COMDAT (fndecl
) = 1;
16252 DECL_DECLARED_INLINE_P (fndecl
) = 1;
16253 DECL_NO_INLINE_WARNING_P (fndecl
) = 1;
16255 /* We process method specializations in finish_struct_1. */
16256 if (processing_template_decl
&& !DECL_TEMPLATE_SPECIALIZATION (fndecl
))
16258 fndecl
= push_template_decl (fndecl
);
16259 if (fndecl
== error_mark_node
)
16263 if (! DECL_FRIEND_P (fndecl
))
16265 if (DECL_CHAIN (fndecl
))
16267 fndecl
= copy_node (fndecl
);
16268 TREE_CHAIN (fndecl
) = NULL_TREE
;
16272 cp_finish_decl (fndecl
, NULL_TREE
, false, NULL_TREE
, 0);
16274 DECL_IN_AGGR_P (fndecl
) = 1;
16279 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
16280 we can lay it out later, when and if its type becomes complete.
16282 Also handle constexpr variables where the initializer involves
16283 an unlowered PTRMEM_CST because the class isn't complete yet. */
16286 maybe_register_incomplete_var (tree var
)
16288 gcc_assert (VAR_P (var
));
16290 /* Keep track of variables with incomplete types. */
16291 if (!processing_template_decl
&& TREE_TYPE (var
) != error_mark_node
16292 && DECL_EXTERNAL (var
))
16294 tree inner_type
= TREE_TYPE (var
);
16296 while (TREE_CODE (inner_type
) == ARRAY_TYPE
)
16297 inner_type
= TREE_TYPE (inner_type
);
16298 inner_type
= TYPE_MAIN_VARIANT (inner_type
);
16300 if ((!COMPLETE_TYPE_P (inner_type
) && CLASS_TYPE_P (inner_type
))
16301 /* RTTI TD entries are created while defining the type_info. */
16302 || (TYPE_LANG_SPECIFIC (inner_type
)
16303 && TYPE_BEING_DEFINED (inner_type
)))
16305 incomplete_var iv
= {var
, inner_type
};
16306 vec_safe_push (incomplete_vars
, iv
);
16308 else if (!(DECL_LANG_SPECIFIC (var
) && DECL_TEMPLATE_INFO (var
))
16309 && decl_constant_var_p (var
)
16310 && (TYPE_PTRMEM_P (inner_type
) || CLASS_TYPE_P (inner_type
)))
16312 /* When the outermost open class is complete we can resolve any
16313 pointers-to-members. */
16314 tree context
= outermost_open_class ();
16315 incomplete_var iv
= {var
, context
};
16316 vec_safe_push (incomplete_vars
, iv
);
16321 /* Called when a class type (given by TYPE) is defined. If there are
16322 any existing VAR_DECLs whose type has been completed by this
16323 declaration, update them now. */
16326 complete_vars (tree type
)
16329 incomplete_var
*iv
;
16331 for (ix
= 0; vec_safe_iterate (incomplete_vars
, ix
, &iv
); )
16333 if (same_type_p (type
, iv
->incomplete_type
))
16335 tree var
= iv
->decl
;
16336 tree type
= TREE_TYPE (var
);
16338 if (type
!= error_mark_node
16339 && (TYPE_MAIN_VARIANT (strip_array_types (type
))
16340 == iv
->incomplete_type
))
16342 /* Complete the type of the variable. The VAR_DECL itself
16343 will be laid out in expand_expr. */
16344 complete_type (type
);
16345 cp_apply_type_quals_to_decl (cp_type_quals (type
), var
);
16348 /* Remove this entry from the list. */
16349 incomplete_vars
->unordered_remove (ix
);
16355 /* Check for pending declarations which may have abstract type. */
16356 complete_type_check_abstract (type
);
16359 /* If DECL is of a type which needs a cleanup, build and return an
16360 expression to perform that cleanup here. Return NULL_TREE if no
16361 cleanup need be done. DECL can also be a _REF when called from
16362 split_nonconstant_init_1. */
16365 cxx_maybe_build_cleanup (tree decl
, tsubst_flags_t complain
)
16371 /* Assume no cleanup is required. */
16372 cleanup
= NULL_TREE
;
16374 if (error_operand_p (decl
))
16377 /* Handle "__attribute__((cleanup))". We run the cleanup function
16378 before the destructor since the destructor is what actually
16379 terminates the lifetime of the object. */
16381 attr
= lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl
));
16390 /* Get the name specified by the user for the cleanup function. */
16391 id
= TREE_VALUE (TREE_VALUE (attr
));
16392 /* Look up the name to find the cleanup function to call. It is
16393 important to use lookup_name here because that is what is
16394 used in c-common.c:handle_cleanup_attribute when performing
16395 initial checks on the attribute. Note that those checks
16396 include ensuring that the function found is not an overloaded
16397 function, or an object with an overloaded call operator,
16398 etc.; we can rely on the fact that the function found is an
16399 ordinary FUNCTION_DECL. */
16400 fn
= lookup_name (id
);
16401 arg
= build_address (decl
);
16402 if (!mark_used (decl
, complain
) && !(complain
& tf_error
))
16403 return error_mark_node
;
16404 cleanup
= cp_build_function_call_nary (fn
, complain
, arg
, NULL_TREE
);
16405 if (cleanup
== error_mark_node
)
16406 return error_mark_node
;
16408 /* Handle ordinary C++ destructors. */
16409 type
= TREE_TYPE (decl
);
16410 if (type_build_dtor_call (type
))
16412 int flags
= LOOKUP_NORMAL
|LOOKUP_NONVIRTUAL
|LOOKUP_DESTRUCTOR
;
16416 if (TREE_CODE (type
) == ARRAY_TYPE
)
16419 addr
= build_address (decl
);
16421 call
= build_delete (TREE_TYPE (addr
), addr
,
16422 sfk_complete_destructor
, flags
, 0, complain
);
16423 if (call
== error_mark_node
)
16424 cleanup
= error_mark_node
;
16425 else if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type
))
16426 /* Discard the call. */;
16428 cleanup
= cp_build_compound_expr (cleanup
, call
, complain
);
16433 /* build_delete sets the location of the destructor call to the
16434 current location, even though the destructor is going to be
16435 called later, at the end of the current scope. This can lead to
16436 a "jumpy" behavior for users of debuggers when they step around
16437 the end of the block. So let's unset the location of the
16438 destructor call instead. */
16439 protected_set_expr_location (cleanup
, UNKNOWN_LOCATION
);
16443 && !lookup_attribute ("warn_unused", TYPE_ATTRIBUTES (TREE_TYPE (decl
)))
16444 /* Treat objects with destructors as used; the destructor may do
16445 something substantive. */
16446 && !mark_used (decl
, complain
) && !(complain
& tf_error
))
16447 return error_mark_node
;
16453 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
16454 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
16455 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
16458 static_fn_type (tree memfntype
)
16463 if (TYPE_PTRMEMFUNC_P (memfntype
))
16464 memfntype
= TYPE_PTRMEMFUNC_FN_TYPE (memfntype
);
16465 if (INDIRECT_TYPE_P (memfntype
)
16466 || TREE_CODE (memfntype
) == FUNCTION_DECL
)
16467 memfntype
= TREE_TYPE (memfntype
);
16468 if (TREE_CODE (memfntype
) == FUNCTION_TYPE
)
16470 gcc_assert (TREE_CODE (memfntype
) == METHOD_TYPE
);
16471 args
= TYPE_ARG_TYPES (memfntype
);
16472 fntype
= build_function_type (TREE_TYPE (memfntype
), TREE_CHAIN (args
));
16473 fntype
= apply_memfn_quals (fntype
, type_memfn_quals (memfntype
));
16474 fntype
= (cp_build_type_attribute_variant
16475 (fntype
, TYPE_ATTRIBUTES (memfntype
)));
16476 fntype
= cxx_copy_lang_qualifiers (fntype
, memfntype
);
16480 /* DECL was originally constructed as a non-static member function,
16481 but turned out to be static. Update it accordingly. */
16484 revert_static_member_fn (tree decl
)
16486 tree stype
= static_fn_type (decl
);
16487 cp_cv_quals quals
= type_memfn_quals (stype
);
16488 cp_ref_qualifier rqual
= type_memfn_rqual (stype
);
16490 if (quals
!= TYPE_UNQUALIFIED
|| rqual
!= REF_QUAL_NONE
)
16491 stype
= apply_memfn_quals (stype
, TYPE_UNQUALIFIED
, REF_QUAL_NONE
);
16493 TREE_TYPE (decl
) = stype
;
16495 if (DECL_ARGUMENTS (decl
))
16496 DECL_ARGUMENTS (decl
) = DECL_CHAIN (DECL_ARGUMENTS (decl
));
16497 DECL_STATIC_FUNCTION_P (decl
) = 1;
16500 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
16501 one of the language-independent trees. */
16503 enum cp_tree_node_structure_enum
16504 cp_tree_node_structure (union lang_tree_node
* t
)
16506 switch (TREE_CODE (&t
->generic
))
16508 case DEFAULT_ARG
: return TS_CP_DEFAULT_ARG
;
16509 case DEFERRED_NOEXCEPT
: return TS_CP_DEFERRED_NOEXCEPT
;
16510 case IDENTIFIER_NODE
: return TS_CP_IDENTIFIER
;
16511 case OVERLOAD
: return TS_CP_OVERLOAD
;
16512 case TEMPLATE_PARM_INDEX
: return TS_CP_TPI
;
16513 case PTRMEM_CST
: return TS_CP_PTRMEM
;
16514 case BASELINK
: return TS_CP_BASELINK
;
16515 case TEMPLATE_DECL
: return TS_CP_TEMPLATE_DECL
;
16516 case STATIC_ASSERT
: return TS_CP_STATIC_ASSERT
;
16517 case ARGUMENT_PACK_SELECT
: return TS_CP_ARGUMENT_PACK_SELECT
;
16518 case TRAIT_EXPR
: return TS_CP_TRAIT_EXPR
;
16519 case LAMBDA_EXPR
: return TS_CP_LAMBDA_EXPR
;
16520 case TEMPLATE_INFO
: return TS_CP_TEMPLATE_INFO
;
16521 case CONSTRAINT_INFO
: return TS_CP_CONSTRAINT_INFO
;
16522 case USERDEF_LITERAL
: return TS_CP_USERDEF_LITERAL
;
16523 default: return TS_CP_GENERIC
;
16527 /* Build the void_list_node (void_type_node having been created). */
16529 build_void_list_node (void)
16531 tree t
= build_tree_list (NULL_TREE
, void_type_node
);
16536 cp_missing_noreturn_ok_p (tree decl
)
16538 /* A missing noreturn is ok for the `main' function. */
16539 return DECL_MAIN_P (decl
);
16542 /* Return the decl used to identify the COMDAT group into which DECL should
16546 cxx_comdat_group (tree decl
)
16548 /* Virtual tables, construction virtual tables, and virtual table
16549 tables all go in a single COMDAT group, named after the primary
16551 if (VAR_P (decl
) && DECL_VTABLE_OR_VTT_P (decl
))
16552 decl
= CLASSTYPE_VTABLES (DECL_CONTEXT (decl
));
16553 /* For all other DECLs, the COMDAT group is the mangled name of the
16554 declaration itself. */
16557 while (DECL_THUNK_P (decl
))
16559 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
16560 into the same section as the target function. In that case
16561 we must return target's name. */
16562 tree target
= THUNK_TARGET (decl
);
16563 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target
)
16564 && DECL_SECTION_NAME (target
) != NULL
16565 && DECL_ONE_ONLY (target
))
16575 /* Returns the return type for FN as written by the user, which may include
16576 a placeholder for a deduced return type. */
16579 fndecl_declared_return_type (tree fn
)
16581 fn
= STRIP_TEMPLATE (fn
);
16582 if (FNDECL_USED_AUTO (fn
))
16584 struct language_function
*f
= NULL
;
16585 if (DECL_STRUCT_FUNCTION (fn
))
16586 f
= DECL_STRUCT_FUNCTION (fn
)->language
;
16588 f
= DECL_SAVED_FUNCTION_DATA (fn
);
16589 return f
->x_auto_return_pattern
;
16591 return TREE_TYPE (TREE_TYPE (fn
));
16594 /* Returns true iff DECL is a variable or function declared with an auto type
16595 that has not yet been deduced to a real type. */
16598 undeduced_auto_decl (tree decl
)
16600 if (cxx_dialect
< cxx11
)
16602 STRIP_ANY_LOCATION_WRAPPER (decl
);
16603 return ((VAR_OR_FUNCTION_DECL_P (decl
)
16604 || TREE_CODE (decl
) == TEMPLATE_DECL
)
16605 && type_uses_auto (TREE_TYPE (decl
)));
16608 /* Complain if DECL has an undeduced return type. */
16611 require_deduced_type (tree decl
, tsubst_flags_t complain
)
16613 if (undeduced_auto_decl (decl
))
16615 if (complain
& tf_error
)
16616 error ("use of %qD before deduction of %<auto%>", decl
);
16622 /* Create a representation of the explicit-specifier with
16623 constant-expression of EXPR. COMPLAIN is as for tsubst. */
16626 build_explicit_specifier (tree expr
, tsubst_flags_t complain
)
16628 if (processing_template_decl
&& value_dependent_expression_p (expr
))
16629 /* Wait for instantiation, tsubst_function_decl will handle it. */
16632 expr
= build_converted_constant_expr (boolean_type_node
, expr
, complain
);
16633 expr
= instantiate_non_dependent_expr (expr
);
16634 expr
= cxx_constant_value (expr
);
16638 #include "gt-cp-decl.h"