1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988-2018 Free Software Foundation, Inc.
3 Contributed by Michael Tiemann (tiemann@cygnus.com)
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3, or (at your option)
12 GCC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
22 /* Process declarations and symbol lookup for C++ front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
31 #include "coretypes.h"
33 #include "c-family/c-target.h"
36 #include "stringpool.h"
38 #include "stor-layout.h"
42 #include "tree-iterator.h"
46 #include "c-family/c-objc.h"
47 #include "c-family/c-pragma.h"
48 #include "c-family/c-ubsan.h"
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 void push_local_name (tree
);
70 static tree
grok_reference_init (tree
, tree
, tree
, int);
71 static tree
grokvardecl (tree
, tree
, tree
, const cp_decl_specifier_seq
*,
72 int, int, int, bool, int, tree
);
73 static void check_static_variable_definition (tree
, tree
);
74 static void record_unknown_type (tree
, const char *);
75 static tree
builtin_function_1 (tree
, tree
, bool);
76 static int member_function_or_else (tree
, tree
, enum overload_flags
);
77 static tree
local_variable_p_walkfn (tree
*, int *, void *);
78 static const char *tag_name (enum tag_types
);
79 static tree
lookup_and_check_tag (enum tag_types
, tree
, tag_scope
, bool);
80 static void maybe_deduce_size_from_array_init (tree
, tree
);
81 static void layout_var_decl (tree
);
82 static tree
check_initializer (tree
, tree
, int, vec
<tree
, va_gc
> **);
83 static void make_rtl_for_nonlocal_decl (tree
, tree
, const char *);
84 static void save_function_data (tree
);
85 static void copy_type_enum (tree
, tree
);
86 static void check_function_type (tree
, tree
);
87 static void finish_constructor_body (void);
88 static void begin_destructor_body (void);
89 static void finish_destructor_body (void);
90 static void record_key_method_defined (tree
);
91 static tree
create_array_type_for_decl (tree
, tree
, tree
);
92 static tree
get_atexit_node (void);
93 static tree
get_dso_handle_node (void);
94 static tree
start_cleanup_fn (void);
95 static void end_cleanup_fn (void);
96 static tree
cp_make_fname_decl (location_t
, tree
, int);
97 static void initialize_predefined_identifiers (void);
98 static tree check_special_function_return_type
99 (special_function_kind
, tree
, tree
, int, const location_t
*);
100 static tree
push_cp_library_fn (enum tree_code
, tree
, int);
101 static tree
build_cp_library_fn (tree
, enum tree_code
, tree
, int);
102 static void store_parm_decls (tree
);
103 static void initialize_local_var (tree
, tree
);
104 static void expand_static_init (tree
, tree
);
106 /* The following symbols are subsumed in the cp_global_trees array, and
107 listed here individually for documentation purposes.
110 tree wchar_decl_node;
112 tree vtable_entry_type;
113 tree delta_type_node;
114 tree __t_desc_type_node;
116 tree class_type_node;
117 tree unknown_type_node;
119 Array type `vtable_entry_type[]'
122 tree vtbl_ptr_type_node;
129 A FUNCTION_DECL which can call `abort'. Not necessarily the
130 one that the user will declare, but sufficient to be called
131 by routines that want to abort the program.
136 tree type_info_type_node, tinfo_decl_id, tinfo_decl_type;
137 tree tinfo_var_id; */
139 tree cp_global_trees
[CPTI_MAX
];
141 #define local_names cp_function_chain->x_local_names
143 /* A list of objects which have constructors or destructors
144 which reside in the global scope. The decl is stored in
145 the TREE_VALUE slot and the initializer is stored
146 in the TREE_PURPOSE slot. */
147 tree static_aggregates
;
149 /* Like static_aggregates, but for thread_local variables. */
154 /* A node for the integer constant 2. */
156 tree integer_two_node
;
158 /* vector of static decls. */
159 vec
<tree
, va_gc
> *static_decls
;
161 /* vector of keyed classes. */
162 vec
<tree
, va_gc
> *keyed_classes
;
164 /* Used only for jumps to as-yet undefined labels, since jumps to
165 defined labels can have their validity checked immediately. */
167 struct GTY((chain_next ("%h.next"))) named_label_use_entry
{
168 struct named_label_use_entry
*next
;
169 /* The binding level to which this entry is *currently* attached.
170 This is initially the binding level in which the goto appeared,
171 but is modified as scopes are closed. */
172 cp_binding_level
*binding_level
;
173 /* The head of the names list that was current when the goto appeared,
174 or the inner scope popped. These are the decls that will *not* be
175 skipped when jumping to the label. */
177 /* The location of the goto, for error reporting. */
178 location_t o_goto_locus
;
179 /* True if an OpenMP structured block scope has been closed since
180 the goto appeared. This means that the branch from the label will
181 illegally exit an OpenMP scope. */
185 /* A list of all LABEL_DECLs in the function that have names. Here so
186 we can clear out their names' definitions at the end of the
187 function, and so we can check the validity of jumps to these labels. */
189 struct GTY((for_user
)) named_label_entry
{
191 tree name
; /* Name of decl. */
193 tree label_decl
; /* LABEL_DECL, unless deleted local label. */
195 named_label_entry
*outer
; /* Outer shadowed chain. */
197 /* The binding level to which the label is *currently* attached.
198 This is initially set to the binding level in which the label
199 is defined, but is modified as scopes are closed. */
200 cp_binding_level
*binding_level
;
202 /* The head of the names list that was current when the label was
203 defined, or the inner scope popped. These are the decls that will
204 be skipped when jumping to the label. */
207 /* A vector of all decls from all binding levels that would be
208 crossed by a backward branch to the label. */
209 vec
<tree
, va_gc
> *bad_decls
;
211 /* A list of uses of the label, before the label is defined. */
212 named_label_use_entry
*uses
;
214 /* The following bits are set after the label is defined, and are
215 updated as scopes are popped. They indicate that a jump to the
216 label will illegally enter a scope of the given flavor. */
220 bool in_transaction_scope
;
221 bool in_constexpr_if
;
224 #define named_labels cp_function_chain->x_named_labels
226 /* The number of function bodies which we are currently processing.
227 (Zero if we are at namespace scope, one inside the body of a
228 function, two inside the body of a function in a local class, etc.) */
231 /* Whether the exception-specifier is part of a function type (i.e. C++17). */
232 bool flag_noexcept_type
;
234 /* States indicating how grokdeclarator() should handle declspecs marked
235 with __attribute__((deprecated)). An object declared as
236 __attribute__((deprecated)) suppresses warnings of uses of other
238 enum deprecated_states deprecated_state
= DEPRECATED_NORMAL
;
241 /* A list of VAR_DECLs whose type was incomplete at the time the
242 variable was declared. */
244 struct GTY(()) incomplete_var
{
246 tree incomplete_type
;
250 static GTY(()) vec
<incomplete_var
, va_gc
> *incomplete_vars
;
252 /* Returns the kind of template specialization we are currently
253 processing, given that it's declaration contained N_CLASS_SCOPES
254 explicit scope qualifications. */
257 current_tmpl_spec_kind (int n_class_scopes
)
259 int n_template_parm_scopes
= 0;
260 int seen_specialization_p
= 0;
261 int innermost_specialization_p
= 0;
264 /* Scan through the template parameter scopes. */
265 for (b
= current_binding_level
;
266 b
->kind
== sk_template_parms
;
269 /* If we see a specialization scope inside a parameter scope,
270 then something is wrong. That corresponds to a declaration
273 template <class T> template <> ...
275 which is always invalid since [temp.expl.spec] forbids the
276 specialization of a class member template if the enclosing
277 class templates are not explicitly specialized as well. */
278 if (b
->explicit_spec_p
)
280 if (n_template_parm_scopes
== 0)
281 innermost_specialization_p
= 1;
283 seen_specialization_p
= 1;
285 else if (seen_specialization_p
== 1)
286 return tsk_invalid_member_spec
;
288 ++n_template_parm_scopes
;
291 /* Handle explicit instantiations. */
292 if (processing_explicit_instantiation
)
294 if (n_template_parm_scopes
!= 0)
295 /* We've seen a template parameter list during an explicit
296 instantiation. For example:
298 template <class T> template void f(int);
300 This is erroneous. */
301 return tsk_invalid_expl_inst
;
303 return tsk_expl_inst
;
306 if (n_template_parm_scopes
< n_class_scopes
)
307 /* We've not seen enough template headers to match all the
308 specialized classes present. For example:
310 template <class T> void R<T>::S<T>::f(int);
312 This is invalid; there needs to be one set of template
313 parameters for each class. */
314 return tsk_insufficient_parms
;
315 else if (n_template_parm_scopes
== n_class_scopes
)
316 /* We're processing a non-template declaration (even though it may
317 be a member of a template class.) For example:
319 template <class T> void S<T>::f(int);
321 The `class T' matches the `S<T>', leaving no template headers
322 corresponding to the `f'. */
324 else if (n_template_parm_scopes
> n_class_scopes
+ 1)
325 /* We've got too many template headers. For example:
327 template <> template <class T> void f (T);
329 There need to be more enclosing classes. */
330 return tsk_excessive_parms
;
332 /* This must be a template. It's of the form:
334 template <class T> template <class U> void S<T>::f(U);
336 This is a specialization if the innermost level was a
337 specialization; otherwise it's just a definition of the
339 return innermost_specialization_p
? tsk_expl_spec
: tsk_template
;
342 /* Exit the current scope. */
350 /* When a label goes out of scope, check to see if that label was used
351 in a valid manner, and issue any appropriate warnings or errors. */
354 check_label_used (tree label
)
356 if (!processing_template_decl
)
358 if (DECL_INITIAL (label
) == NULL_TREE
)
362 error ("label %q+D used but not defined", label
);
363 location
= input_location
;
364 /* FIXME want (LOCATION_FILE (input_location), (line)0) */
365 /* Avoid crashing later. */
366 define_label (location
, DECL_NAME (label
));
369 warn_for_unused_label (label
);
373 /* Helper function to sort named label entries in a vector by DECL_UID. */
376 sort_labels (const void *a
, const void *b
)
378 tree label1
= *(tree
const *) a
;
379 tree label2
= *(tree
const *) b
;
381 /* DECL_UIDs can never be equal. */
382 return DECL_UID (label1
) > DECL_UID (label2
) ? -1 : +1;
385 /* At the end of a function, all labels declared within the function
386 go out of scope. BLOCK is the top-level block for the
390 pop_labels (tree block
)
395 /* We need to add the labels to the block chain, so debug
396 information is emitted. But, we want the order to be stable so
397 need to sort them first. Otherwise the debug output could be
398 randomly ordered. I guess it's mostly stable, unless the hash
399 table implementation changes. */
400 auto_vec
<tree
, 32> labels (named_labels
->elements ());
401 hash_table
<named_label_hash
>::iterator
end (named_labels
->end ());
402 for (hash_table
<named_label_hash
>::iterator iter
403 (named_labels
->begin ()); iter
!= end
; ++iter
)
405 named_label_entry
*ent
= *iter
;
407 gcc_checking_assert (!ent
->outer
);
409 labels
.quick_push (ent
->label_decl
);
413 labels
.qsort (sort_labels
);
415 while (labels
.length ())
417 tree label
= labels
.pop ();
419 DECL_CHAIN (label
) = BLOCK_VARS (block
);
420 BLOCK_VARS (block
) = label
;
422 check_label_used (label
);
426 /* At the end of a block with local labels, restore the outer definition. */
429 pop_local_label (tree id
, tree label
)
431 check_label_used (label
);
432 named_label_entry
**slot
= named_labels
->find_slot_with_hash
433 (id
, IDENTIFIER_HASH_VALUE (id
), NO_INSERT
);
434 named_label_entry
*ent
= *slot
;
440 ent
= ggc_cleared_alloc
<named_label_entry
> ();
446 /* The following two routines are used to interface to Objective-C++.
447 The binding level is purposely treated as an opaque type. */
450 objc_get_current_scope (void)
452 return current_binding_level
;
455 /* The following routine is used by the NeXT-style SJLJ exceptions;
456 variables get marked 'volatile' so as to not be clobbered by
457 _setjmp()/_longjmp() calls. All variables in the current scope,
458 as well as parent scopes up to (but not including) ENCLOSING_BLK
459 shall be thusly marked. */
462 objc_mark_locals_volatile (void *enclosing_blk
)
464 cp_binding_level
*scope
;
466 for (scope
= current_binding_level
;
467 scope
&& scope
!= enclosing_blk
;
468 scope
= scope
->level_chain
)
472 for (decl
= scope
->names
; decl
; decl
= TREE_CHAIN (decl
))
473 objc_volatilize_decl (decl
);
475 /* Do not climb up past the current function. */
476 if (scope
->kind
== sk_function_parms
)
481 /* True if B is the level for the condition of a constexpr if. */
484 level_for_constexpr_if (cp_binding_level
*b
)
486 return (b
->kind
== sk_cond
&& b
->this_entity
487 && TREE_CODE (b
->this_entity
) == IF_STMT
488 && IF_STMT_CONSTEXPR_P (b
->this_entity
));
491 /* Update data for defined and undefined labels when leaving a scope. */
494 poplevel_named_label_1 (named_label_entry
**slot
, cp_binding_level
*bl
)
496 named_label_entry
*ent
= *slot
;
497 cp_binding_level
*obl
= bl
->level_chain
;
499 if (ent
->binding_level
== bl
)
503 /* ENT->NAMES_IN_SCOPE may contain a mixture of DECLs and
504 TREE_LISTs representing OVERLOADs, so be careful. */
505 for (decl
= ent
->names_in_scope
; decl
; decl
= (DECL_P (decl
)
507 : TREE_CHAIN (decl
)))
508 if (decl_jump_unsafe (decl
))
509 vec_safe_push (ent
->bad_decls
, decl
);
511 ent
->binding_level
= obl
;
512 ent
->names_in_scope
= obl
->names
;
516 ent
->in_try_scope
= true;
519 ent
->in_catch_scope
= true;
522 ent
->in_omp_scope
= true;
525 ent
->in_transaction_scope
= true;
528 if (level_for_constexpr_if (bl
->level_chain
))
529 ent
->in_constexpr_if
= true;
537 struct named_label_use_entry
*use
;
539 for (use
= ent
->uses
; use
; use
= use
->next
)
540 if (use
->binding_level
== bl
)
542 use
->binding_level
= obl
;
543 use
->names_in_scope
= obl
->names
;
544 if (bl
->kind
== sk_omp
)
545 use
->in_omp_scope
= true;
552 /* Saved errorcount to avoid -Wunused-but-set-{parameter,variable} warnings
553 when errors were reported, except for -Werror-unused-but-set-*. */
554 static int unused_but_set_errorcount
;
556 /* Exit a binding level.
557 Pop the level off, and restore the state of the identifier-decl mappings
558 that were in effect when this level was entered.
560 If KEEP == 1, this level had explicit declarations, so
561 and create a "block" (a BLOCK node) for the level
562 to record its declarations and subblocks for symbol table output.
564 If FUNCTIONBODY is nonzero, this level is the body of a function,
565 so create a block as if KEEP were set and also clear out all
568 If REVERSE is nonzero, reverse the order of decls before putting
569 them into the BLOCK. */
572 poplevel (int keep
, int reverse
, int functionbody
)
575 /* The chain of decls was accumulated in reverse order.
576 Put it into forward order, just for cleanliness. */
583 bool subtime
= timevar_cond_start (TV_NAME_LOOKUP
);
588 gcc_assert (current_binding_level
->kind
!= sk_class
589 && current_binding_level
->kind
!= sk_namespace
);
591 if (current_binding_level
->kind
== sk_cleanup
)
593 subblocks
= functionbody
>= 0 ? current_binding_level
->blocks
: 0;
595 gcc_assert (!vec_safe_length (current_binding_level
->class_shadowed
));
597 /* We used to use KEEP == 2 to indicate that the new block should go
598 at the beginning of the list of blocks at this binding level,
599 rather than the end. This hack is no longer used. */
600 gcc_assert (keep
== 0 || keep
== 1);
602 if (current_binding_level
->keep
)
605 /* Any uses of undefined labels, and any defined labels, now operate
606 under constraints of next binding contour. */
607 if (cfun
&& !functionbody
&& named_labels
)
608 named_labels
->traverse
<cp_binding_level
*, poplevel_named_label_1
>
609 (current_binding_level
);
611 /* Get the decls in the order they were written.
612 Usually current_binding_level->names is in reverse order.
613 But parameter decls were previously put in forward order. */
615 decls
= current_binding_level
->names
;
618 decls
= nreverse (decls
);
619 current_binding_level
->names
= decls
;
622 /* If there were any declarations or structure tags in that level,
623 or if this level is a function body,
624 create a BLOCK to record them for the life of this function. */
626 /* Avoid function body block if possible. */
627 if (functionbody
&& subblocks
&& BLOCK_CHAIN (subblocks
) == NULL_TREE
)
629 else if (keep
== 1 || functionbody
)
630 block
= make_node (BLOCK
);
631 if (block
!= NULL_TREE
)
633 BLOCK_VARS (block
) = decls
;
634 BLOCK_SUBBLOCKS (block
) = subblocks
;
637 /* In each subblock, record that this is its superior. */
639 for (link
= subblocks
; link
; link
= BLOCK_CHAIN (link
))
640 BLOCK_SUPERCONTEXT (link
) = block
;
642 /* Before we remove the declarations first check for unused variables. */
643 if ((warn_unused_variable
|| warn_unused_but_set_variable
)
644 && current_binding_level
->kind
!= sk_template_parms
645 && !processing_template_decl
)
646 for (tree d
= get_local_decls (); d
; d
= TREE_CHAIN (d
))
648 /* There are cases where D itself is a TREE_LIST. See in
649 push_local_binding where the list of decls returned by
650 getdecls is built. */
651 decl
= TREE_CODE (d
) == TREE_LIST
? TREE_VALUE (d
) : d
;
653 tree type
= TREE_TYPE (decl
);
655 && (! TREE_USED (decl
) || !DECL_READ_P (decl
))
656 && ! DECL_IN_SYSTEM_HEADER (decl
)
657 /* For structured bindings, consider only real variables, not
659 && (DECL_DECOMPOSITION_P (decl
) ? !DECL_DECOMP_BASE (decl
)
660 : (DECL_NAME (decl
) && !DECL_ARTIFICIAL (decl
)))
661 && type
!= error_mark_node
662 && (!CLASS_TYPE_P (type
)
663 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
)
664 || lookup_attribute ("warn_unused",
665 TYPE_ATTRIBUTES (TREE_TYPE (decl
)))))
667 if (! TREE_USED (decl
))
669 if (!DECL_NAME (decl
) && DECL_DECOMPOSITION_P (decl
))
670 warning_at (DECL_SOURCE_LOCATION (decl
),
671 OPT_Wunused_variable
,
672 "unused structured binding declaration");
674 warning_at (DECL_SOURCE_LOCATION (decl
),
675 OPT_Wunused_variable
, "unused variable %qD", decl
);
677 else if (DECL_CONTEXT (decl
) == current_function_decl
678 // For -Wunused-but-set-variable leave references alone.
679 && !TYPE_REF_P (TREE_TYPE (decl
))
680 && errorcount
== unused_but_set_errorcount
)
682 if (!DECL_NAME (decl
) && DECL_DECOMPOSITION_P (decl
))
683 warning_at (DECL_SOURCE_LOCATION (decl
),
684 OPT_Wunused_but_set_variable
, "structured "
685 "binding declaration set but not used");
687 warning_at (DECL_SOURCE_LOCATION (decl
),
688 OPT_Wunused_but_set_variable
,
689 "variable %qD set but not used", decl
);
690 unused_but_set_errorcount
= errorcount
;
695 /* Remove declarations for all the DECLs in this level. */
696 for (link
= decls
; link
; link
= TREE_CHAIN (link
))
698 decl
= TREE_CODE (link
) == TREE_LIST
? TREE_VALUE (link
) : link
;
699 tree name
= OVL_NAME (decl
);
701 /* Remove the binding. */
702 if (TREE_CODE (decl
) == LABEL_DECL
)
703 pop_local_label (name
, decl
);
705 pop_local_binding (name
, decl
);
708 /* Restore the IDENTIFIER_TYPE_VALUEs. */
709 for (link
= current_binding_level
->type_shadowed
;
710 link
; link
= TREE_CHAIN (link
))
711 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (link
), TREE_VALUE (link
));
713 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
714 list if a `using' declaration put them there. The debugging
715 back ends won't understand OVERLOAD, so we remove them here.
716 Because the BLOCK_VARS are (temporarily) shared with
717 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
718 popped all the bindings. Also remove undeduced 'auto' decls,
719 which LTO doesn't understand, and can't have been used by anything. */
724 for (d
= &BLOCK_VARS (block
); *d
; )
726 if (TREE_CODE (*d
) == TREE_LIST
727 || (!processing_template_decl
728 && undeduced_auto_decl (*d
)))
729 *d
= TREE_CHAIN (*d
);
731 d
= &DECL_CHAIN (*d
);
735 /* If the level being exited is the top level of a function,
736 check over all the labels. */
741 /* Since this is the top level block of a function, the vars are
742 the function's parameters. Don't leave them in the BLOCK
743 because they are found in the FUNCTION_DECL instead. */
744 BLOCK_VARS (block
) = 0;
748 pop_labels (subblocks
);
751 kind
= current_binding_level
->kind
;
752 if (kind
== sk_cleanup
)
756 /* If this is a temporary binding created for a cleanup, then we'll
757 have pushed a statement list level. Pop that, create a new
758 BIND_EXPR for the block, and insert it into the stream. */
759 stmt
= pop_stmt_list (current_binding_level
->statement_list
);
760 stmt
= c_build_bind_expr (input_location
, block
, stmt
);
767 /* The current function is being defined, so its DECL_INITIAL
768 should be error_mark_node. */
769 gcc_assert (DECL_INITIAL (current_function_decl
) == error_mark_node
);
770 DECL_INITIAL (current_function_decl
) = block
? block
: subblocks
;
773 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl
))
775 if (BLOCK_SUBBLOCKS (subblocks
))
776 BLOCK_OUTER_CURLY_BRACE_P (BLOCK_SUBBLOCKS (subblocks
)) = 1;
779 BLOCK_OUTER_CURLY_BRACE_P (subblocks
) = 1;
783 current_binding_level
->blocks
784 = block_chainon (current_binding_level
->blocks
, block
);
786 /* If we did not make a block for the level just exited,
787 any blocks made for inner levels
788 (since they cannot be recorded as subblocks in that level)
789 must be carried forward so they will later become subblocks
790 of something else. */
792 current_binding_level
->blocks
793 = block_chainon (current_binding_level
->blocks
, subblocks
);
795 /* Each and every BLOCK node created here in `poplevel' is important
796 (e.g. for proper debugging information) so if we created one
797 earlier, mark it as "used". */
799 TREE_USED (block
) = 1;
801 /* All temporary bindings created for cleanups are popped silently. */
802 if (kind
== sk_cleanup
)
805 timevar_cond_stop (TV_NAME_LOOKUP
, subtime
);
809 /* Call wrapup_globals_declarations for the globals in NAMESPACE. */
810 /* Diagnose odr-used extern inline variables without definitions
811 in the current TU. */
814 wrapup_namespace_globals ()
816 if (vec
<tree
, va_gc
> *statics
= static_decls
)
820 FOR_EACH_VEC_ELT (*statics
, i
, decl
)
822 if (warn_unused_function
823 && TREE_CODE (decl
) == FUNCTION_DECL
824 && DECL_INITIAL (decl
) == 0
825 && DECL_EXTERNAL (decl
)
826 && !TREE_PUBLIC (decl
)
827 && !DECL_ARTIFICIAL (decl
)
828 && !DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl
)
829 && !TREE_NO_WARNING (decl
))
830 warning_at (DECL_SOURCE_LOCATION (decl
),
831 OPT_Wunused_function
,
832 "%qF declared %<static%> but never defined", decl
);
835 && DECL_EXTERNAL (decl
)
836 && DECL_INLINE_VAR_P (decl
)
837 && DECL_ODR_USED (decl
))
838 error_at (DECL_SOURCE_LOCATION (decl
),
839 "odr-used inline variable %qD is not defined", decl
);
842 /* Clear out the list, so we don't rescan next time. */
845 /* Write out any globals that need to be output. */
846 return wrapup_global_declarations (statics
->address (),
852 /* In C++, you don't have to write `struct S' to refer to `S'; you
853 can just use `S'. We accomplish this by creating a TYPE_DECL as
854 if the user had written `typedef struct S S'. Create and return
855 the TYPE_DECL for TYPE. */
858 create_implicit_typedef (tree name
, tree type
)
862 decl
= build_decl (input_location
, TYPE_DECL
, name
, type
);
863 DECL_ARTIFICIAL (decl
) = 1;
864 /* There are other implicit type declarations, like the one *within*
865 a class that allows you to write `S::S'. We must distinguish
867 SET_DECL_IMPLICIT_TYPEDEF_P (decl
);
868 TYPE_NAME (type
) = decl
;
869 TYPE_STUB_DECL (type
) = decl
;
874 /* Remember a local name for name-mangling purposes. */
877 push_local_name (tree decl
)
882 timevar_start (TV_NAME_LOOKUP
);
884 name
= DECL_NAME (decl
);
886 nelts
= vec_safe_length (local_names
);
887 for (i
= 0; i
< nelts
; i
++)
889 t
= (*local_names
)[i
];
890 if (DECL_NAME (t
) == name
)
892 retrofit_lang_decl (decl
);
893 DECL_LANG_SPECIFIC (decl
)->u
.base
.u2sel
= 1;
894 if (DECL_DISCRIMINATOR_SET_P (t
))
895 DECL_DISCRIMINATOR (decl
) = DECL_DISCRIMINATOR (t
) + 1;
897 DECL_DISCRIMINATOR (decl
) = 1;
899 (*local_names
)[i
] = decl
;
900 timevar_stop (TV_NAME_LOOKUP
);
905 vec_safe_push (local_names
, decl
);
906 timevar_stop (TV_NAME_LOOKUP
);
909 /* Subroutine of duplicate_decls: return truthvalue of whether
910 or not types of these decls match.
912 For C++, we must compare the parameter list so that `int' can match
913 `int&' in a parameter position, but `int&' is not confused with
917 decls_match (tree newdecl
, tree olddecl
, bool record_versions
/* = true */)
921 if (newdecl
== olddecl
)
924 if (TREE_CODE (newdecl
) != TREE_CODE (olddecl
))
925 /* If the two DECLs are not even the same kind of thing, we're not
926 interested in their types. */
929 gcc_assert (DECL_P (newdecl
));
931 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
933 tree f1
= TREE_TYPE (newdecl
);
934 tree f2
= TREE_TYPE (olddecl
);
935 tree p1
= TYPE_ARG_TYPES (f1
);
936 tree p2
= TYPE_ARG_TYPES (f2
);
939 /* Specializations of different templates are different functions
940 even if they have the same type. */
941 tree t1
= (DECL_USE_TEMPLATE (newdecl
)
942 ? DECL_TI_TEMPLATE (newdecl
)
944 tree t2
= (DECL_USE_TEMPLATE (olddecl
)
945 ? DECL_TI_TEMPLATE (olddecl
)
950 if (CP_DECL_CONTEXT (newdecl
) != CP_DECL_CONTEXT (olddecl
)
951 && ! (DECL_EXTERN_C_P (newdecl
)
952 && DECL_EXTERN_C_P (olddecl
)))
955 /* A new declaration doesn't match a built-in one unless it
956 is also extern "C". */
957 if (DECL_IS_BUILTIN (olddecl
)
958 && DECL_EXTERN_C_P (olddecl
) && !DECL_EXTERN_C_P (newdecl
))
961 if (TREE_CODE (f1
) != TREE_CODE (f2
))
964 /* A declaration with deduced return type should use its pre-deduction
965 type for declaration matching. */
966 r2
= fndecl_declared_return_type (olddecl
);
968 if (same_type_p (TREE_TYPE (f1
), r2
))
970 if (!prototype_p (f2
) && DECL_EXTERN_C_P (olddecl
)
971 && fndecl_built_in_p (olddecl
))
973 types_match
= self_promoting_args_p (p1
);
974 if (p1
== void_list_node
)
975 TREE_TYPE (newdecl
) = TREE_TYPE (olddecl
);
980 && type_memfn_rqual (f1
) == type_memfn_rqual (f2
)
981 && (TYPE_ATTRIBUTES (TREE_TYPE (newdecl
)) == NULL_TREE
982 || comp_type_attributes (TREE_TYPE (newdecl
),
983 TREE_TYPE (olddecl
)) != 0);
988 /* The decls dont match if they correspond to two different versions
989 of the same function. Disallow extern "C" functions to be
992 && !DECL_EXTERN_C_P (newdecl
)
993 && !DECL_EXTERN_C_P (olddecl
)
995 && maybe_version_functions (newdecl
, olddecl
,
996 (!DECL_FUNCTION_VERSIONED (newdecl
)
997 || !DECL_FUNCTION_VERSIONED (olddecl
))))
1000 else if (TREE_CODE (newdecl
) == TEMPLATE_DECL
)
1002 tree oldres
= DECL_TEMPLATE_RESULT (olddecl
);
1003 tree newres
= DECL_TEMPLATE_RESULT (newdecl
);
1005 if (TREE_CODE (newres
) != TREE_CODE (oldres
))
1008 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl
),
1009 DECL_TEMPLATE_PARMS (olddecl
)))
1012 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) == TYPE_DECL
)
1013 types_match
= (same_type_p (TREE_TYPE (oldres
), TREE_TYPE (newres
))
1014 && equivalently_constrained (olddecl
, newdecl
));
1016 // We don't need to check equivalently_constrained for variable and
1017 // function templates because we check it on the results.
1018 types_match
= decls_match (oldres
, newres
);
1022 /* Need to check scope for variable declaration (VAR_DECL).
1023 For typedef (TYPE_DECL), scope is ignored. */
1025 && CP_DECL_CONTEXT (newdecl
) != CP_DECL_CONTEXT (olddecl
)
1027 Two declarations for an object with C language linkage
1028 with the same name (ignoring the namespace that qualify
1029 it) that appear in different namespace scopes refer to
1031 && !(DECL_EXTERN_C_P (olddecl
) && DECL_EXTERN_C_P (newdecl
)))
1034 if (TREE_TYPE (newdecl
) == error_mark_node
)
1035 types_match
= TREE_TYPE (olddecl
) == error_mark_node
;
1036 else if (TREE_TYPE (olddecl
) == NULL_TREE
)
1037 types_match
= TREE_TYPE (newdecl
) == NULL_TREE
;
1038 else if (TREE_TYPE (newdecl
) == NULL_TREE
)
1041 types_match
= comptypes (TREE_TYPE (newdecl
),
1042 TREE_TYPE (olddecl
),
1043 COMPARE_REDECLARATION
);
1046 // Normal functions can be constrained, as can variable partial
1048 if (types_match
&& VAR_OR_FUNCTION_DECL_P (newdecl
))
1049 types_match
= equivalently_constrained (newdecl
, olddecl
);
1054 /* NEWDECL and OLDDECL have identical signatures. If they are
1055 different versions adjust them and return true.
1056 If RECORD is set to true, record function versions. */
1059 maybe_version_functions (tree newdecl
, tree olddecl
, bool record
)
1061 if (!targetm
.target_option
.function_versions (newdecl
, olddecl
))
1064 if (!DECL_FUNCTION_VERSIONED (olddecl
))
1066 DECL_FUNCTION_VERSIONED (olddecl
) = 1;
1067 if (DECL_ASSEMBLER_NAME_SET_P (olddecl
))
1068 mangle_decl (olddecl
);
1071 if (!DECL_FUNCTION_VERSIONED (newdecl
))
1073 DECL_FUNCTION_VERSIONED (newdecl
) = 1;
1074 if (DECL_ASSEMBLER_NAME_SET_P (newdecl
))
1075 mangle_decl (newdecl
);
1079 cgraph_node::record_function_versions (olddecl
, newdecl
);
1084 /* If NEWDECL is `static' and an `extern' was seen previously,
1085 warn about it. OLDDECL is the previous declaration.
1087 Note that this does not apply to the C++ case of declaring
1088 a variable `extern const' and then later `const'.
1090 Don't complain about built-in functions, since they are beyond
1091 the user's control. */
1094 warn_extern_redeclared_static (tree newdecl
, tree olddecl
)
1096 if (TREE_CODE (newdecl
) == TYPE_DECL
1097 || TREE_CODE (newdecl
) == TEMPLATE_DECL
1098 || TREE_CODE (newdecl
) == CONST_DECL
1099 || TREE_CODE (newdecl
) == NAMESPACE_DECL
)
1102 /* Don't get confused by static member functions; that's a different
1104 if (TREE_CODE (newdecl
) == FUNCTION_DECL
1105 && DECL_STATIC_FUNCTION_P (newdecl
))
1108 /* If the old declaration was `static', or the new one isn't, then
1109 everything is OK. */
1110 if (DECL_THIS_STATIC (olddecl
) || !DECL_THIS_STATIC (newdecl
))
1113 /* It's OK to declare a builtin function as `static'. */
1114 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1115 && DECL_ARTIFICIAL (olddecl
))
1118 auto_diagnostic_group d
;
1119 if (permerror (DECL_SOURCE_LOCATION (newdecl
),
1120 "%qD was declared %<extern%> and later %<static%>", newdecl
))
1121 inform (DECL_SOURCE_LOCATION (olddecl
),
1122 "previous declaration of %qD", olddecl
);
1125 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1126 function templates. If their exception specifications do not
1127 match, issue a diagnostic. */
1130 check_redeclaration_exception_specification (tree new_decl
,
1133 tree new_exceptions
= TYPE_RAISES_EXCEPTIONS (TREE_TYPE (new_decl
));
1134 tree old_exceptions
= TYPE_RAISES_EXCEPTIONS (TREE_TYPE (old_decl
));
1136 /* Two default specs are equivalent, don't force evaluation. */
1137 if (UNEVALUATED_NOEXCEPT_SPEC_P (new_exceptions
)
1138 && UNEVALUATED_NOEXCEPT_SPEC_P (old_exceptions
))
1141 if (!type_dependent_expression_p (old_decl
))
1143 maybe_instantiate_noexcept (new_decl
);
1144 maybe_instantiate_noexcept (old_decl
);
1146 new_exceptions
= TYPE_RAISES_EXCEPTIONS (TREE_TYPE (new_decl
));
1147 old_exceptions
= TYPE_RAISES_EXCEPTIONS (TREE_TYPE (old_decl
));
1151 If any declaration of a function has an exception-specification,
1152 all declarations, including the definition and an explicit
1153 specialization, of that function shall have an
1154 exception-specification with the same set of type-ids. */
1155 if (! DECL_IS_BUILTIN (old_decl
)
1156 && !comp_except_specs (new_exceptions
, old_exceptions
, ce_normal
))
1158 const char *const msg
1159 = G_("declaration of %qF has a different exception specifier");
1160 bool complained
= true;
1161 location_t new_loc
= DECL_SOURCE_LOCATION (new_decl
);
1162 auto_diagnostic_group d
;
1163 if (DECL_IN_SYSTEM_HEADER (old_decl
))
1164 complained
= pedwarn (new_loc
, OPT_Wsystem_headers
, msg
, new_decl
);
1165 else if (!flag_exceptions
)
1166 /* We used to silently permit mismatched eh specs with
1167 -fno-exceptions, so make them a pedwarn now. */
1168 complained
= pedwarn (new_loc
, OPT_Wpedantic
, msg
, new_decl
);
1170 error_at (new_loc
, msg
, new_decl
);
1172 inform (DECL_SOURCE_LOCATION (old_decl
),
1173 "from previous declaration %qF", old_decl
);
1177 /* Return true if OLD_DECL and NEW_DECL agree on constexprness.
1178 Otherwise issue diagnostics. */
1181 validate_constexpr_redeclaration (tree old_decl
, tree new_decl
)
1183 old_decl
= STRIP_TEMPLATE (old_decl
);
1184 new_decl
= STRIP_TEMPLATE (new_decl
);
1185 if (!VAR_OR_FUNCTION_DECL_P (old_decl
)
1186 || !VAR_OR_FUNCTION_DECL_P (new_decl
))
1188 if (DECL_DECLARED_CONSTEXPR_P (old_decl
)
1189 == DECL_DECLARED_CONSTEXPR_P (new_decl
))
1191 if (TREE_CODE (old_decl
) == FUNCTION_DECL
)
1193 if (fndecl_built_in_p (old_decl
))
1195 /* Hide a built-in declaration. */
1196 DECL_DECLARED_CONSTEXPR_P (old_decl
)
1197 = DECL_DECLARED_CONSTEXPR_P (new_decl
);
1200 /* 7.1.5 [dcl.constexpr]
1201 Note: An explicit specialization can differ from the template
1202 declaration with respect to the constexpr specifier. */
1203 if (! DECL_TEMPLATE_SPECIALIZATION (old_decl
)
1204 && DECL_TEMPLATE_SPECIALIZATION (new_decl
))
1207 error_at (DECL_SOURCE_LOCATION (new_decl
),
1208 "redeclaration %qD differs in %<constexpr%> "
1209 "from previous declaration", new_decl
);
1210 inform (DECL_SOURCE_LOCATION (old_decl
),
1211 "previous declaration %qD", old_decl
);
1217 // If OLDDECL and NEWDECL are concept declarations with the same type
1218 // (i.e., and template parameters), but different requirements,
1219 // emit diagnostics and return true. Otherwise, return false.
1221 check_concept_refinement (tree olddecl
, tree newdecl
)
1223 if (!DECL_DECLARED_CONCEPT_P (olddecl
) || !DECL_DECLARED_CONCEPT_P (newdecl
))
1226 tree d1
= DECL_TEMPLATE_RESULT (olddecl
);
1227 tree d2
= DECL_TEMPLATE_RESULT (newdecl
);
1228 if (TREE_CODE (d1
) != TREE_CODE (d2
))
1231 tree t1
= TREE_TYPE (d1
);
1232 tree t2
= TREE_TYPE (d2
);
1233 if (TREE_CODE (d1
) == FUNCTION_DECL
)
1235 if (compparms (TYPE_ARG_TYPES (t1
), TYPE_ARG_TYPES (t2
))
1236 && comp_template_parms (DECL_TEMPLATE_PARMS (olddecl
),
1237 DECL_TEMPLATE_PARMS (newdecl
))
1238 && !equivalently_constrained (olddecl
, newdecl
))
1240 error ("cannot specialize concept %q#D", olddecl
);
1247 /* DECL is a redeclaration of a function or function template. If
1248 it does have default arguments issue a diagnostic. Note: this
1249 function is used to enforce the requirements in C++11 8.3.6 about
1250 no default arguments in redeclarations. */
1253 check_redeclaration_no_default_args (tree decl
)
1255 gcc_assert (DECL_DECLARES_FUNCTION_P (decl
));
1257 for (tree t
= FUNCTION_FIRST_USER_PARMTYPE (decl
);
1258 t
&& t
!= void_list_node
; t
= TREE_CHAIN (t
))
1259 if (TREE_PURPOSE (t
))
1261 permerror (DECL_SOURCE_LOCATION (decl
),
1262 "redeclaration of %q#D may not have default "
1268 /* NEWDECL is a redeclaration of a function or function template OLDDECL,
1269 in any case represented as FUNCTION_DECLs (the DECL_TEMPLATE_RESULTs of
1270 the TEMPLATE_DECLs in case of function templates). This function is used
1271 to enforce the final part of C++17 11.3.6/4, about a single declaration:
1272 "If a friend declaration specifies a default argument expression, that
1273 declaration shall be a definition and shall be the only declaration of
1274 the function or function template in the translation unit." */
1277 check_no_redeclaration_friend_default_args (tree olddecl
, tree newdecl
,
1278 bool olddecl_hidden_friend_p
)
1280 if (!olddecl_hidden_friend_p
&& !DECL_FRIEND_P (newdecl
))
1283 tree t1
= FUNCTION_FIRST_USER_PARMTYPE (olddecl
);
1284 tree t2
= FUNCTION_FIRST_USER_PARMTYPE (newdecl
);
1286 for (; t1
&& t1
!= void_list_node
;
1287 t1
= TREE_CHAIN (t1
), t2
= TREE_CHAIN (t2
))
1288 if ((olddecl_hidden_friend_p
&& TREE_PURPOSE (t1
))
1289 || (DECL_FRIEND_P (newdecl
) && TREE_PURPOSE (t2
)))
1291 auto_diagnostic_group d
;
1292 if (permerror (DECL_SOURCE_LOCATION (newdecl
),
1293 "friend declaration of %q#D specifies default "
1294 "arguments and isn't the only declaration", newdecl
))
1295 inform (DECL_SOURCE_LOCATION (olddecl
),
1296 "previous declaration of %q#D", olddecl
);
1301 /* Merge tree bits that correspond to attributes noreturn, nothrow,
1302 const, malloc, and pure from NEWDECL with those of OLDDECL. */
1305 merge_attribute_bits (tree newdecl
, tree olddecl
)
1307 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
1308 TREE_THIS_VOLATILE (olddecl
) |= TREE_THIS_VOLATILE (newdecl
);
1309 TREE_NOTHROW (newdecl
) |= TREE_NOTHROW (olddecl
);
1310 TREE_NOTHROW (olddecl
) |= TREE_NOTHROW (newdecl
);
1311 TREE_READONLY (newdecl
) |= TREE_READONLY (olddecl
);
1312 TREE_READONLY (olddecl
) |= TREE_READONLY (newdecl
);
1313 DECL_IS_MALLOC (newdecl
) |= DECL_IS_MALLOC (olddecl
);
1314 DECL_IS_MALLOC (olddecl
) |= DECL_IS_MALLOC (newdecl
);
1315 DECL_PURE_P (newdecl
) |= DECL_PURE_P (olddecl
);
1316 DECL_PURE_P (olddecl
) |= DECL_PURE_P (newdecl
);
1317 DECL_UNINLINABLE (newdecl
) |= DECL_UNINLINABLE (olddecl
);
1318 DECL_UNINLINABLE (olddecl
) |= DECL_UNINLINABLE (newdecl
);
1321 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1322 && lookup_attribute ("gnu_inline", \
1323 DECL_ATTRIBUTES (fn)))
1325 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1326 If the redeclaration is invalid, a diagnostic is issued, and the
1327 error_mark_node is returned. Otherwise, OLDDECL is returned.
1329 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1332 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1335 duplicate_decls (tree newdecl
, tree olddecl
, bool newdecl_is_friend
)
1337 unsigned olddecl_uid
= DECL_UID (olddecl
);
1338 int olddecl_friend
= 0, types_match
= 0, hidden_friend
= 0;
1339 int olddecl_hidden_friend
= 0;
1340 int new_defines_function
= 0;
1341 tree new_template_info
;
1342 location_t olddecl_loc
= DECL_SOURCE_LOCATION (olddecl
);
1343 location_t newdecl_loc
= DECL_SOURCE_LOCATION (newdecl
);
1345 if (newdecl
== olddecl
)
1348 types_match
= decls_match (newdecl
, olddecl
);
1350 /* If either the type of the new decl or the type of the old decl is an
1351 error_mark_node, then that implies that we have already issued an
1352 error (earlier) for some bogus type specification, and in that case,
1353 it is rather pointless to harass the user with yet more error message
1354 about the same declaration, so just pretend the types match here. */
1355 if (TREE_TYPE (newdecl
) == error_mark_node
1356 || TREE_TYPE (olddecl
) == error_mark_node
)
1357 return error_mark_node
;
1359 if (DECL_NAME (newdecl
)
1360 && DECL_NAME (olddecl
)
1361 && UDLIT_OPER_P (DECL_NAME (newdecl
))
1362 && UDLIT_OPER_P (DECL_NAME (olddecl
)))
1364 if (TREE_CODE (newdecl
) == TEMPLATE_DECL
1365 && TREE_CODE (olddecl
) != TEMPLATE_DECL
1366 && check_raw_literal_operator (olddecl
))
1367 error_at (newdecl_loc
,
1368 "literal operator template %qD conflicts with"
1369 " raw literal operator %qD", newdecl
, olddecl
);
1370 else if (TREE_CODE (newdecl
) != TEMPLATE_DECL
1371 && TREE_CODE (olddecl
) == TEMPLATE_DECL
1372 && check_raw_literal_operator (newdecl
))
1373 error_at (newdecl_loc
,
1374 "raw literal operator %qD conflicts with"
1375 " literal operator template %qD", newdecl
, olddecl
);
1378 /* True to merge attributes between the declarations, false to
1379 set OLDDECL's attributes to those of NEWDECL (for template
1380 explicit specializations that specify their own attributes
1381 independent of those specified for the primary template). */
1382 const bool merge_attr
= (TREE_CODE (newdecl
) != FUNCTION_DECL
1383 || !DECL_TEMPLATE_SPECIALIZATION (newdecl
)
1384 || DECL_TEMPLATE_SPECIALIZATION (olddecl
));
1386 if (DECL_P (olddecl
)
1387 && TREE_CODE (newdecl
) == FUNCTION_DECL
1388 && TREE_CODE (olddecl
) == FUNCTION_DECL
1390 && diagnose_mismatched_attributes (olddecl
, newdecl
))
1392 if (DECL_INITIAL (olddecl
))
1393 inform (olddecl_loc
,
1394 "previous definition of %qD was here", olddecl
);
1396 inform (olddecl_loc
,
1397 "previous declaration of %qD was here", olddecl
);
1400 /* Check for redeclaration and other discrepancies. */
1401 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1402 && DECL_ARTIFICIAL (olddecl
))
1404 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl
));
1405 if (TREE_CODE (newdecl
) != FUNCTION_DECL
)
1407 /* Avoid warnings redeclaring built-ins which have not been
1408 explicitly declared. */
1409 if (DECL_ANTICIPATED (olddecl
))
1411 if (TREE_PUBLIC (newdecl
)
1412 && CP_DECL_CONTEXT (newdecl
) == global_namespace
)
1413 warning_at (newdecl_loc
,
1414 OPT_Wbuiltin_declaration_mismatch
,
1415 "built-in function %qD declared as non-function",
1420 /* If you declare a built-in or predefined function name as static,
1421 the old definition is overridden, but optionally warn this was a
1422 bad choice of name. */
1423 if (! TREE_PUBLIC (newdecl
))
1425 warning_at (newdecl_loc
,
1427 fndecl_built_in_p (olddecl
)
1428 ? G_("shadowing built-in function %q#D")
1429 : G_("shadowing library function %q#D"), olddecl
);
1430 /* Discard the old built-in function. */
1433 /* If the built-in is not ansi, then programs can override
1434 it even globally without an error. */
1435 else if (! fndecl_built_in_p (olddecl
))
1436 warning_at (newdecl_loc
, 0,
1437 "library function %q#D redeclared as non-function %q#D",
1440 error_at (newdecl_loc
,
1441 "declaration of %q#D conflicts with built-in "
1442 "declaration %q#D", newdecl
, olddecl
);
1445 else if (DECL_OMP_DECLARE_REDUCTION_P (olddecl
))
1447 gcc_assert (DECL_OMP_DECLARE_REDUCTION_P (newdecl
));
1448 error_at (newdecl_loc
,
1449 "redeclaration of %<pragma omp declare reduction%>");
1450 inform (olddecl_loc
,
1451 "previous %<pragma omp declare reduction%> declaration");
1452 return error_mark_node
;
1454 else if (!types_match
)
1456 /* Avoid warnings redeclaring built-ins which have not been
1457 explicitly declared. */
1458 if (DECL_ANTICIPATED (olddecl
))
1462 /* A new declaration doesn't match a built-in one unless it
1463 is also extern "C". */
1464 gcc_assert (DECL_IS_BUILTIN (olddecl
));
1465 gcc_assert (DECL_EXTERN_C_P (olddecl
));
1466 if (!DECL_EXTERN_C_P (newdecl
))
1469 for (t1
= TYPE_ARG_TYPES (TREE_TYPE (newdecl
)),
1470 t2
= TYPE_ARG_TYPES (TREE_TYPE (olddecl
));
1472 t1
= TREE_CHAIN (t1
), t2
= TREE_CHAIN (t2
))
1476 /* FILE, tm types are not known at the time
1477 we create the builtins. */
1478 for (unsigned i
= 0;
1479 i
< sizeof (builtin_structptr_types
)
1480 / sizeof (builtin_structptr_type
);
1482 if (TREE_VALUE (t2
) == builtin_structptr_types
[i
].node
)
1484 tree t
= TREE_VALUE (t1
);
1487 && TYPE_IDENTIFIER (TREE_TYPE (t
))
1488 == get_identifier (builtin_structptr_types
[i
].str
)
1489 && compparms (TREE_CHAIN (t1
), TREE_CHAIN (t2
)))
1491 tree oldargs
= TYPE_ARG_TYPES (TREE_TYPE (olddecl
));
1493 TYPE_ARG_TYPES (TREE_TYPE (olddecl
))
1494 = TYPE_ARG_TYPES (TREE_TYPE (newdecl
));
1495 types_match
= decls_match (newdecl
, olddecl
);
1497 return duplicate_decls (newdecl
, olddecl
,
1499 TYPE_ARG_TYPES (TREE_TYPE (olddecl
)) = oldargs
;
1504 if (! same_type_p (TREE_VALUE (t1
), TREE_VALUE (t2
)))
1509 warning_at (newdecl_loc
,
1510 OPT_Wbuiltin_declaration_mismatch
,
1511 "declaration of %q#D conflicts with built-in "
1512 "declaration %q#D", newdecl
, olddecl
);
1514 else if ((DECL_EXTERN_C_P (newdecl
)
1515 && DECL_EXTERN_C_P (olddecl
))
1516 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl
)),
1517 TYPE_ARG_TYPES (TREE_TYPE (olddecl
))))
1519 /* Don't really override olddecl for __* prefixed builtins
1520 except for __[^b]*_chk, the compiler might be using those
1522 if (fndecl_built_in_p (olddecl
))
1524 tree id
= DECL_NAME (olddecl
);
1525 const char *name
= IDENTIFIER_POINTER (id
);
1530 && (strncmp (name
+ 2, "builtin_",
1531 strlen ("builtin_")) == 0
1532 || (len
= strlen (name
)) <= strlen ("___chk")
1533 || memcmp (name
+ len
- strlen ("_chk"),
1534 "_chk", strlen ("_chk") + 1) != 0))
1536 if (DECL_INITIAL (newdecl
))
1538 error_at (newdecl_loc
,
1539 "definition of %q#D ambiguates built-in "
1540 "declaration %q#D", newdecl
, olddecl
);
1541 return error_mark_node
;
1543 auto_diagnostic_group d
;
1544 if (permerror (newdecl_loc
,
1545 "new declaration %q#D ambiguates built-in"
1546 " declaration %q#D", newdecl
, olddecl
)
1548 inform (newdecl_loc
,
1549 "ignoring the %q#D declaration", newdecl
);
1550 return flag_permissive
? olddecl
: error_mark_node
;
1554 /* A near match; override the builtin. */
1556 if (TREE_PUBLIC (newdecl
))
1557 warning_at (newdecl_loc
,
1558 OPT_Wbuiltin_declaration_mismatch
,
1559 "new declaration %q#D ambiguates built-in "
1560 "declaration %q#D", newdecl
, olddecl
);
1562 warning (OPT_Wshadow
,
1563 fndecl_built_in_p (olddecl
)
1564 ? G_("shadowing built-in function %q#D")
1565 : G_("shadowing library function %q#D"), olddecl
);
1568 /* Discard the old built-in function. */
1571 /* Replace the old RTL to avoid problems with inlining. */
1572 COPY_DECL_RTL (newdecl
, olddecl
);
1574 /* Even if the types match, prefer the new declarations type for
1575 built-ins which have not been explicitly declared, for
1576 exception lists, etc... */
1577 else if (DECL_IS_BUILTIN (olddecl
))
1579 tree type
= TREE_TYPE (newdecl
);
1580 tree attribs
= (*targetm
.merge_type_attributes
)
1581 (TREE_TYPE (olddecl
), type
);
1583 type
= cp_build_type_attribute_variant (type
, attribs
);
1584 TREE_TYPE (newdecl
) = TREE_TYPE (olddecl
) = type
;
1587 /* If a function is explicitly declared "throw ()", propagate that to
1588 the corresponding builtin. */
1589 if (DECL_BUILT_IN_CLASS (olddecl
) == BUILT_IN_NORMAL
1590 && DECL_ANTICIPATED (olddecl
)
1591 && TREE_NOTHROW (newdecl
)
1592 && !TREE_NOTHROW (olddecl
))
1594 enum built_in_function fncode
= DECL_FUNCTION_CODE (olddecl
);
1595 tree tmpdecl
= builtin_decl_explicit (fncode
);
1596 if (tmpdecl
&& tmpdecl
!= olddecl
&& types_match
)
1597 TREE_NOTHROW (tmpdecl
) = 1;
1600 /* Whether or not the builtin can throw exceptions has no
1601 bearing on this declarator. */
1602 TREE_NOTHROW (olddecl
) = 0;
1604 if (DECL_THIS_STATIC (newdecl
) && !DECL_THIS_STATIC (olddecl
))
1606 /* If a builtin function is redeclared as `static', merge
1607 the declarations, but make the original one static. */
1608 DECL_THIS_STATIC (olddecl
) = 1;
1609 TREE_PUBLIC (olddecl
) = 0;
1611 /* Make the old declaration consistent with the new one so
1612 that all remnants of the builtin-ness of this function
1613 will be banished. */
1614 SET_DECL_LANGUAGE (olddecl
, DECL_LANGUAGE (newdecl
));
1615 COPY_DECL_RTL (newdecl
, olddecl
);
1618 else if (TREE_CODE (olddecl
) != TREE_CODE (newdecl
))
1620 /* C++ Standard, 3.3, clause 4:
1621 "[Note: a namespace name or a class template name must be unique
1622 in its declarative region (7.3.2, clause 14). ]" */
1623 if (TREE_CODE (olddecl
) != NAMESPACE_DECL
1624 && TREE_CODE (newdecl
) != NAMESPACE_DECL
1625 && (TREE_CODE (olddecl
) != TEMPLATE_DECL
1626 || TREE_CODE (DECL_TEMPLATE_RESULT (olddecl
)) != TYPE_DECL
)
1627 && (TREE_CODE (newdecl
) != TEMPLATE_DECL
1628 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) != TYPE_DECL
))
1630 if ((TREE_CODE (olddecl
) == TYPE_DECL
&& DECL_ARTIFICIAL (olddecl
)
1631 && TREE_CODE (newdecl
) != TYPE_DECL
)
1632 || (TREE_CODE (newdecl
) == TYPE_DECL
&& DECL_ARTIFICIAL (newdecl
)
1633 && TREE_CODE (olddecl
) != TYPE_DECL
))
1635 /* We do nothing special here, because C++ does such nasty
1636 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1637 get shadowed, and know that if we need to find a TYPE_DECL
1638 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1639 slot of the identifier. */
1643 if ((TREE_CODE (newdecl
) == FUNCTION_DECL
1644 && DECL_FUNCTION_TEMPLATE_P (olddecl
))
1645 || (TREE_CODE (olddecl
) == FUNCTION_DECL
1646 && DECL_FUNCTION_TEMPLATE_P (newdecl
)))
1650 error ("%q#D redeclared as different kind of symbol", newdecl
);
1651 if (TREE_CODE (olddecl
) == TREE_LIST
)
1652 olddecl
= TREE_VALUE (olddecl
);
1653 inform (olddecl_loc
,
1654 "previous declaration %q#D", olddecl
);
1656 return error_mark_node
;
1658 else if (!types_match
)
1660 if (CP_DECL_CONTEXT (newdecl
) != CP_DECL_CONTEXT (olddecl
))
1661 /* These are certainly not duplicate declarations; they're
1662 from different scopes. */
1665 if (TREE_CODE (newdecl
) == TEMPLATE_DECL
)
1667 /* The name of a class template may not be declared to refer to
1668 any other template, class, function, object, namespace, value,
1669 or type in the same scope. */
1670 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl
)) == TYPE_DECL
1671 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) == TYPE_DECL
)
1673 error_at (newdecl_loc
,
1674 "conflicting declaration of template %q#D", newdecl
);
1675 inform (olddecl_loc
,
1676 "previous declaration %q#D", olddecl
);
1677 return error_mark_node
;
1679 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl
)) == FUNCTION_DECL
1680 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) == FUNCTION_DECL
1681 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl
))),
1682 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl
))))
1683 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl
),
1684 DECL_TEMPLATE_PARMS (olddecl
))
1685 /* Template functions can be disambiguated by
1687 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl
)),
1688 TREE_TYPE (TREE_TYPE (olddecl
)))
1689 // Template functions can also be disambiguated by
1691 && equivalently_constrained (olddecl
, newdecl
))
1693 error_at (newdecl_loc
, "ambiguating new declaration %q#D",
1695 inform (olddecl_loc
,
1696 "old declaration %q#D", olddecl
);
1698 else if (check_concept_refinement (olddecl
, newdecl
))
1699 return error_mark_node
;
1702 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1704 if (DECL_EXTERN_C_P (newdecl
) && DECL_EXTERN_C_P (olddecl
))
1706 error_at (newdecl_loc
,
1707 "conflicting declaration of C function %q#D",
1709 inform (olddecl_loc
,
1710 "previous declaration %q#D", olddecl
);
1713 /* For function versions, params and types match, but they
1714 are not ambiguous. */
1715 else if ((!DECL_FUNCTION_VERSIONED (newdecl
)
1716 && !DECL_FUNCTION_VERSIONED (olddecl
))
1717 // The functions have the same parameter types.
1718 && compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl
)),
1719 TYPE_ARG_TYPES (TREE_TYPE (olddecl
)))
1720 // And the same constraints.
1721 && equivalently_constrained (newdecl
, olddecl
))
1723 error_at (newdecl_loc
,
1724 "ambiguating new declaration of %q#D", newdecl
);
1725 inform (olddecl_loc
,
1726 "old declaration %q#D", olddecl
);
1727 return error_mark_node
;
1734 error_at (newdecl_loc
, "conflicting declaration %q#D", newdecl
);
1735 inform (olddecl_loc
,
1736 "previous declaration as %q#D", olddecl
);
1737 return error_mark_node
;
1740 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
1741 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl
)
1742 && (!DECL_TEMPLATE_INFO (newdecl
)
1743 || (DECL_TI_TEMPLATE (newdecl
)
1744 != DECL_TI_TEMPLATE (olddecl
))))
1745 || (DECL_TEMPLATE_SPECIALIZATION (newdecl
)
1746 && (!DECL_TEMPLATE_INFO (olddecl
)
1747 || (DECL_TI_TEMPLATE (olddecl
)
1748 != DECL_TI_TEMPLATE (newdecl
))))))
1749 /* It's OK to have a template specialization and a non-template
1750 with the same type, or to have specializations of two
1751 different templates with the same type. Note that if one is a
1752 specialization, and the other is an instantiation of the same
1753 template, that we do not exit at this point. That situation
1754 can occur if we instantiate a template class, and then
1755 specialize one of its methods. This situation is valid, but
1756 the declarations must be merged in the usual way. */
1758 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
1759 && ((DECL_TEMPLATE_INSTANTIATION (olddecl
)
1760 && !DECL_USE_TEMPLATE (newdecl
))
1761 || (DECL_TEMPLATE_INSTANTIATION (newdecl
)
1762 && !DECL_USE_TEMPLATE (olddecl
))))
1763 /* One of the declarations is a template instantiation, and the
1764 other is not a template at all. That's OK. */
1766 else if (TREE_CODE (newdecl
) == NAMESPACE_DECL
)
1768 /* In [namespace.alias] we have:
1770 In a declarative region, a namespace-alias-definition can be
1771 used to redefine a namespace-alias declared in that declarative
1772 region to refer only to the namespace to which it already
1775 Therefore, if we encounter a second alias directive for the same
1776 alias, we can just ignore the second directive. */
1777 if (DECL_NAMESPACE_ALIAS (newdecl
)
1778 && (DECL_NAMESPACE_ALIAS (newdecl
)
1779 == DECL_NAMESPACE_ALIAS (olddecl
)))
1782 /* Leave it to update_binding to merge or report error. */
1787 const char *errmsg
= redeclaration_error_message (newdecl
, olddecl
);
1790 auto_diagnostic_group d
;
1791 error_at (newdecl_loc
, errmsg
, newdecl
);
1792 if (DECL_NAME (olddecl
) != NULL_TREE
)
1793 inform (olddecl_loc
,
1794 (DECL_INITIAL (olddecl
) && namespace_bindings_p ())
1795 ? G_("%q#D previously defined here")
1796 : G_("%q#D previously declared here"), olddecl
);
1797 return error_mark_node
;
1799 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1800 && DECL_INITIAL (olddecl
) != NULL_TREE
1801 && !prototype_p (TREE_TYPE (olddecl
))
1802 && prototype_p (TREE_TYPE (newdecl
)))
1804 /* Prototype decl follows defn w/o prototype. */
1805 auto_diagnostic_group d
;
1806 if (warning_at (newdecl_loc
, 0,
1807 "prototype specified for %q#D", newdecl
))
1808 inform (olddecl_loc
,
1809 "previous non-prototype definition here");
1811 else if (VAR_OR_FUNCTION_DECL_P (olddecl
)
1812 && DECL_LANGUAGE (newdecl
) != DECL_LANGUAGE (olddecl
))
1815 If two declarations of the same function or object
1816 specify different linkage-specifications ..., the program
1817 is ill-formed.... Except for functions with C++ linkage,
1818 a function declaration without a linkage specification
1819 shall not precede the first linkage specification for
1820 that function. A function can be declared without a
1821 linkage specification after an explicit linkage
1822 specification has been seen; the linkage explicitly
1823 specified in the earlier declaration is not affected by
1824 such a function declaration.
1826 DR 563 raises the question why the restrictions on
1827 functions should not also apply to objects. Older
1828 versions of G++ silently ignore the linkage-specification
1836 which is clearly wrong. Therefore, we now treat objects
1838 if (current_lang_depth () == 0)
1840 /* There is no explicit linkage-specification, so we use
1841 the linkage from the previous declaration. */
1842 retrofit_lang_decl (newdecl
);
1843 SET_DECL_LANGUAGE (newdecl
, DECL_LANGUAGE (olddecl
));
1847 auto_diagnostic_group d
;
1848 error_at (newdecl_loc
,
1849 "conflicting declaration of %q#D with %qL linkage",
1850 newdecl
, DECL_LANGUAGE (newdecl
));
1851 inform (olddecl_loc
,
1852 "previous declaration with %qL linkage",
1853 DECL_LANGUAGE (olddecl
));
1857 if (DECL_LANG_SPECIFIC (olddecl
) && DECL_USE_TEMPLATE (olddecl
))
1859 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
1861 /* Note: free functions, as TEMPLATE_DECLs, are handled below. */
1862 if (DECL_FUNCTION_MEMBER_P (olddecl
)
1863 && (/* grokfndecl passes member function templates too
1864 as FUNCTION_DECLs. */
1865 DECL_TEMPLATE_INFO (olddecl
)
1867 Default arguments for a member function of a class
1868 template shall be specified on the initial declaration
1869 of the member function within the class template. */
1870 || CLASSTYPE_TEMPLATE_INFO (CP_DECL_CONTEXT (olddecl
))))
1871 check_redeclaration_no_default_args (newdecl
);
1874 tree t1
= FUNCTION_FIRST_USER_PARMTYPE (olddecl
);
1875 tree t2
= FUNCTION_FIRST_USER_PARMTYPE (newdecl
);
1878 for (; t1
&& t1
!= void_list_node
;
1879 t1
= TREE_CHAIN (t1
), t2
= TREE_CHAIN (t2
), i
++)
1880 if (TREE_PURPOSE (t1
) && TREE_PURPOSE (t2
))
1882 if (simple_cst_equal (TREE_PURPOSE (t1
),
1883 TREE_PURPOSE (t2
)) == 1)
1885 auto_diagnostic_group d
;
1886 if (permerror (newdecl_loc
,
1887 "default argument given for parameter "
1888 "%d of %q#D", i
, newdecl
))
1889 inform (olddecl_loc
,
1890 "previous specification in %q#D here",
1895 auto_diagnostic_group d
;
1896 error_at (newdecl_loc
,
1897 "default argument given for parameter %d "
1898 "of %q#D", i
, newdecl
);
1899 inform (olddecl_loc
,
1900 "previous specification in %q#D here",
1905 /* C++17 11.3.6/4: "If a friend declaration specifies a default
1906 argument expression, that declaration... shall be the only
1907 declaration of the function or function template in the
1908 translation unit." */
1909 check_no_redeclaration_friend_default_args
1910 (olddecl
, newdecl
, DECL_HIDDEN_FRIEND_P (olddecl
));
1915 /* Do not merge an implicit typedef with an explicit one. In:
1919 typedef class A A __attribute__ ((foo));
1921 the attribute should apply only to the typedef. */
1922 if (TREE_CODE (olddecl
) == TYPE_DECL
1923 && (DECL_IMPLICIT_TYPEDEF_P (olddecl
)
1924 || DECL_IMPLICIT_TYPEDEF_P (newdecl
)))
1927 /* If new decl is `static' and an `extern' was seen previously,
1929 warn_extern_redeclared_static (newdecl
, olddecl
);
1931 if (!validate_constexpr_redeclaration (olddecl
, newdecl
))
1932 return error_mark_node
;
1934 /* We have committed to returning 1 at this point. */
1935 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1937 /* Now that functions must hold information normally held
1938 by field decls, there is extra work to do so that
1939 declaration information does not get destroyed during
1941 if (DECL_VINDEX (olddecl
))
1942 DECL_VINDEX (newdecl
) = DECL_VINDEX (olddecl
);
1943 if (DECL_CONTEXT (olddecl
))
1944 DECL_CONTEXT (newdecl
) = DECL_CONTEXT (olddecl
);
1945 DECL_STATIC_CONSTRUCTOR (newdecl
) |= DECL_STATIC_CONSTRUCTOR (olddecl
);
1946 DECL_STATIC_DESTRUCTOR (newdecl
) |= DECL_STATIC_DESTRUCTOR (olddecl
);
1947 DECL_PURE_VIRTUAL_P (newdecl
) |= DECL_PURE_VIRTUAL_P (olddecl
);
1948 DECL_VIRTUAL_P (newdecl
) |= DECL_VIRTUAL_P (olddecl
);
1949 DECL_INVALID_OVERRIDER_P (newdecl
) |= DECL_INVALID_OVERRIDER_P (olddecl
);
1950 DECL_FINAL_P (newdecl
) |= DECL_FINAL_P (olddecl
);
1951 DECL_OVERRIDE_P (newdecl
) |= DECL_OVERRIDE_P (olddecl
);
1952 DECL_THIS_STATIC (newdecl
) |= DECL_THIS_STATIC (olddecl
);
1953 if (DECL_OVERLOADED_OPERATOR_P (olddecl
))
1954 DECL_OVERLOADED_OPERATOR_CODE_RAW (newdecl
)
1955 = DECL_OVERLOADED_OPERATOR_CODE_RAW (olddecl
);
1956 new_defines_function
= DECL_INITIAL (newdecl
) != NULL_TREE
;
1958 /* Optionally warn about more than one declaration for the same
1959 name, but don't warn about a function declaration followed by a
1961 if (warn_redundant_decls
&& ! DECL_ARTIFICIAL (olddecl
)
1962 && !(new_defines_function
&& DECL_INITIAL (olddecl
) == NULL_TREE
)
1963 /* Don't warn about extern decl followed by definition. */
1964 && !(DECL_EXTERNAL (olddecl
) && ! DECL_EXTERNAL (newdecl
))
1965 /* Don't warn about friends, let add_friend take care of it. */
1966 && ! (newdecl_is_friend
|| DECL_FRIEND_P (olddecl
))
1967 /* Don't warn about declaration followed by specialization. */
1968 && (! DECL_TEMPLATE_SPECIALIZATION (newdecl
)
1969 || DECL_TEMPLATE_SPECIALIZATION (olddecl
)))
1971 auto_diagnostic_group d
;
1972 if (warning_at (newdecl_loc
,
1973 OPT_Wredundant_decls
,
1974 "redundant redeclaration of %qD in same scope",
1976 inform (olddecl_loc
,
1977 "previous declaration of %qD", olddecl
);
1980 if (!(DECL_TEMPLATE_INSTANTIATION (olddecl
)
1981 && DECL_TEMPLATE_SPECIALIZATION (newdecl
)))
1983 if (DECL_DELETED_FN (newdecl
))
1985 auto_diagnostic_group d
;
1986 error_at (newdecl_loc
, "deleted definition of %qD", newdecl
);
1987 inform (olddecl_loc
,
1988 "previous declaration of %qD", olddecl
);
1990 DECL_DELETED_FN (newdecl
) |= DECL_DELETED_FN (olddecl
);
1994 /* Deal with C++: must preserve virtual function table size. */
1995 if (TREE_CODE (olddecl
) == TYPE_DECL
)
1997 tree newtype
= TREE_TYPE (newdecl
);
1998 tree oldtype
= TREE_TYPE (olddecl
);
2000 if (newtype
!= error_mark_node
&& oldtype
!= error_mark_node
2001 && TYPE_LANG_SPECIFIC (newtype
) && TYPE_LANG_SPECIFIC (oldtype
))
2002 CLASSTYPE_FRIEND_CLASSES (newtype
)
2003 = CLASSTYPE_FRIEND_CLASSES (oldtype
);
2005 DECL_ORIGINAL_TYPE (newdecl
) = DECL_ORIGINAL_TYPE (olddecl
);
2008 /* Copy all the DECL_... slots specified in the new decl except for
2009 any that we copy here from the old type. */
2011 DECL_ATTRIBUTES (newdecl
)
2012 = (*targetm
.merge_decl_attributes
) (olddecl
, newdecl
);
2014 DECL_ATTRIBUTES (olddecl
) = DECL_ATTRIBUTES (newdecl
);
2016 if (DECL_DECLARES_FUNCTION_P (olddecl
) && DECL_DECLARES_FUNCTION_P (newdecl
))
2018 olddecl_friend
= DECL_FRIEND_P (olddecl
);
2019 olddecl_hidden_friend
= DECL_HIDDEN_FRIEND_P (olddecl
);
2020 hidden_friend
= (DECL_ANTICIPATED (olddecl
)
2021 && DECL_HIDDEN_FRIEND_P (olddecl
)
2022 && newdecl_is_friend
);
2025 DECL_ANTICIPATED (olddecl
) = 0;
2026 DECL_HIDDEN_FRIEND_P (olddecl
) = 0;
2030 if (TREE_CODE (newdecl
) == TEMPLATE_DECL
)
2032 tree old_result
= DECL_TEMPLATE_RESULT (olddecl
);
2033 tree new_result
= DECL_TEMPLATE_RESULT (newdecl
);
2034 TREE_TYPE (olddecl
) = TREE_TYPE (old_result
);
2035 DECL_TEMPLATE_SPECIALIZATIONS (olddecl
)
2036 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl
),
2037 DECL_TEMPLATE_SPECIALIZATIONS (newdecl
));
2039 DECL_ATTRIBUTES (old_result
)
2040 = (*targetm
.merge_decl_attributes
) (old_result
, new_result
);
2042 if (DECL_FUNCTION_TEMPLATE_P (newdecl
))
2044 if (DECL_SOURCE_LOCATION (newdecl
)
2045 != DECL_SOURCE_LOCATION (olddecl
))
2047 /* Per C++11 8.3.6/4, default arguments cannot be added in
2048 later declarations of a function template. */
2049 check_redeclaration_no_default_args (newdecl
);
2050 /* C++17 11.3.6/4: "If a friend declaration specifies a default
2051 argument expression, that declaration... shall be the only
2052 declaration of the function or function template in the
2053 translation unit." */
2054 check_no_redeclaration_friend_default_args
2055 (old_result
, new_result
, olddecl_hidden_friend
);
2058 check_default_args (newdecl
);
2060 if (GNU_INLINE_P (old_result
) != GNU_INLINE_P (new_result
)
2061 && DECL_INITIAL (new_result
))
2063 if (DECL_INITIAL (old_result
))
2064 DECL_UNINLINABLE (old_result
) = 1;
2066 DECL_UNINLINABLE (old_result
) = DECL_UNINLINABLE (new_result
);
2067 DECL_EXTERNAL (old_result
) = DECL_EXTERNAL (new_result
);
2068 DECL_NOT_REALLY_EXTERN (old_result
)
2069 = DECL_NOT_REALLY_EXTERN (new_result
);
2070 DECL_INTERFACE_KNOWN (old_result
)
2071 = DECL_INTERFACE_KNOWN (new_result
);
2072 DECL_DECLARED_INLINE_P (old_result
)
2073 = DECL_DECLARED_INLINE_P (new_result
);
2074 DECL_DISREGARD_INLINE_LIMITS (old_result
)
2075 |= DECL_DISREGARD_INLINE_LIMITS (new_result
);
2080 DECL_DECLARED_INLINE_P (old_result
)
2081 |= DECL_DECLARED_INLINE_P (new_result
);
2082 DECL_DISREGARD_INLINE_LIMITS (old_result
)
2083 |= DECL_DISREGARD_INLINE_LIMITS (new_result
);
2084 check_redeclaration_exception_specification (newdecl
, olddecl
);
2086 merge_attribute_bits (new_result
, old_result
);
2090 /* If the new declaration is a definition, update the file and
2091 line information on the declaration, and also make
2092 the old declaration the same definition. */
2093 if (DECL_INITIAL (new_result
) != NULL_TREE
)
2095 DECL_SOURCE_LOCATION (olddecl
)
2096 = DECL_SOURCE_LOCATION (old_result
)
2097 = DECL_SOURCE_LOCATION (newdecl
);
2098 DECL_INITIAL (old_result
) = DECL_INITIAL (new_result
);
2099 if (DECL_FUNCTION_TEMPLATE_P (newdecl
))
2102 DECL_ARGUMENTS (old_result
)
2103 = DECL_ARGUMENTS (new_result
);
2104 for (parm
= DECL_ARGUMENTS (old_result
); parm
;
2105 parm
= DECL_CHAIN (parm
))
2106 DECL_CONTEXT (parm
) = old_result
;
2115 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2116 check_redeclaration_exception_specification (newdecl
, olddecl
);
2118 /* Automatically handles default parameters. */
2119 tree oldtype
= TREE_TYPE (olddecl
);
2122 /* For typedefs use the old type, as the new type's DECL_NAME points
2123 at newdecl, which will be ggc_freed. */
2124 if (TREE_CODE (newdecl
) == TYPE_DECL
)
2126 /* But NEWTYPE might have an attribute, honor that. */
2127 tree tem
= TREE_TYPE (newdecl
);
2130 if (TYPE_USER_ALIGN (tem
))
2132 if (TYPE_ALIGN (tem
) > TYPE_ALIGN (newtype
))
2133 SET_TYPE_ALIGN (newtype
, TYPE_ALIGN (tem
));
2134 TYPE_USER_ALIGN (newtype
) = true;
2137 /* And remove the new type from the variants list. */
2138 if (TYPE_NAME (TREE_TYPE (newdecl
)) == newdecl
)
2140 tree remove
= TREE_TYPE (newdecl
);
2141 for (tree t
= TYPE_MAIN_VARIANT (remove
); ;
2142 t
= TYPE_NEXT_VARIANT (t
))
2143 if (TYPE_NEXT_VARIANT (t
) == remove
)
2145 TYPE_NEXT_VARIANT (t
) = TYPE_NEXT_VARIANT (remove
);
2150 else if (merge_attr
)
2151 newtype
= merge_types (TREE_TYPE (newdecl
), TREE_TYPE (olddecl
));
2153 newtype
= TREE_TYPE (newdecl
);
2155 if (VAR_P (newdecl
))
2157 DECL_THIS_EXTERN (newdecl
) |= DECL_THIS_EXTERN (olddecl
);
2158 /* For already initialized vars, TREE_READONLY could have been
2159 cleared in cp_finish_decl, because the var needs runtime
2160 initialization or destruction. Make sure not to set
2161 TREE_READONLY on it again. */
2162 if (DECL_INITIALIZED_P (olddecl
)
2163 && !DECL_EXTERNAL (olddecl
)
2164 && !TREE_READONLY (olddecl
))
2165 TREE_READONLY (newdecl
) = 0;
2166 DECL_INITIALIZED_P (newdecl
) |= DECL_INITIALIZED_P (olddecl
);
2167 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl
)
2168 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl
);
2169 if (DECL_DEPENDENT_INIT_P (olddecl
))
2170 SET_DECL_DEPENDENT_INIT_P (newdecl
, true);
2171 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl
)
2172 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl
);
2173 if (DECL_CLASS_SCOPE_P (olddecl
))
2174 DECL_DECLARED_CONSTEXPR_P (newdecl
)
2175 |= DECL_DECLARED_CONSTEXPR_P (olddecl
);
2177 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
2178 if (DECL_LANG_SPECIFIC (olddecl
)
2179 && CP_DECL_THREADPRIVATE_P (olddecl
))
2181 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
2182 retrofit_lang_decl (newdecl
);
2183 CP_DECL_THREADPRIVATE_P (newdecl
) = 1;
2187 /* An explicit specialization of a function template or of a member
2188 function of a class template can be declared transaction_safe
2189 independently of whether the corresponding template entity is declared
2190 transaction_safe. */
2191 if (flag_tm
&& TREE_CODE (newdecl
) == FUNCTION_DECL
2192 && DECL_TEMPLATE_INSTANTIATION (olddecl
)
2193 && DECL_TEMPLATE_SPECIALIZATION (newdecl
)
2194 && tx_safe_fn_type_p (newtype
)
2195 && !tx_safe_fn_type_p (TREE_TYPE (newdecl
)))
2196 newtype
= tx_unsafe_fn_variant (newtype
);
2198 TREE_TYPE (newdecl
) = TREE_TYPE (olddecl
) = newtype
;
2200 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2201 check_default_args (newdecl
);
2203 /* Lay the type out, unless already done. */
2204 if (! same_type_p (newtype
, oldtype
)
2205 && TREE_TYPE (newdecl
) != error_mark_node
2206 && !(processing_template_decl
&& uses_template_parms (newdecl
)))
2207 layout_type (TREE_TYPE (newdecl
));
2209 if ((VAR_P (newdecl
)
2210 || TREE_CODE (newdecl
) == PARM_DECL
2211 || TREE_CODE (newdecl
) == RESULT_DECL
2212 || TREE_CODE (newdecl
) == FIELD_DECL
2213 || TREE_CODE (newdecl
) == TYPE_DECL
)
2214 && !(processing_template_decl
&& uses_template_parms (newdecl
)))
2215 layout_decl (newdecl
, 0);
2217 /* Merge deprecatedness. */
2218 if (TREE_DEPRECATED (newdecl
))
2219 TREE_DEPRECATED (olddecl
) = 1;
2221 /* Preserve function specific target and optimization options */
2222 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2224 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl
)
2225 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl
))
2226 DECL_FUNCTION_SPECIFIC_TARGET (newdecl
)
2227 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl
);
2229 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
)
2230 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
))
2231 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
)
2232 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
);
2236 /* Merge the const type qualifier. */
2237 if (TREE_READONLY (newdecl
))
2238 TREE_READONLY (olddecl
) = 1;
2239 /* Merge the volatile type qualifier. */
2240 if (TREE_THIS_VOLATILE (newdecl
))
2241 TREE_THIS_VOLATILE (olddecl
) = 1;
2244 /* Merge the initialization information. */
2245 if (DECL_INITIAL (newdecl
) == NULL_TREE
2246 && DECL_INITIAL (olddecl
) != NULL_TREE
)
2248 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
2249 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
2250 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2252 DECL_SAVED_TREE (newdecl
) = DECL_SAVED_TREE (olddecl
);
2253 DECL_STRUCT_FUNCTION (newdecl
) = DECL_STRUCT_FUNCTION (olddecl
);
2257 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2259 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl
)
2260 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl
);
2261 DECL_NO_LIMIT_STACK (newdecl
) |= DECL_NO_LIMIT_STACK (olddecl
);
2262 DECL_IS_OPERATOR_NEW (newdecl
) |= DECL_IS_OPERATOR_NEW (olddecl
);
2263 DECL_LOOPING_CONST_OR_PURE_P (newdecl
)
2264 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl
);
2267 merge_attribute_bits (newdecl
, olddecl
);
2270 /* Merge the noreturn bit. */
2271 TREE_THIS_VOLATILE (olddecl
) = TREE_THIS_VOLATILE (newdecl
);
2272 TREE_READONLY (olddecl
) = TREE_READONLY (newdecl
);
2273 TREE_NOTHROW (olddecl
) = TREE_NOTHROW (newdecl
);
2274 DECL_IS_MALLOC (olddecl
) = DECL_IS_MALLOC (newdecl
);
2275 DECL_PURE_P (olddecl
) = DECL_PURE_P (newdecl
);
2277 /* Keep the old RTL. */
2278 COPY_DECL_RTL (olddecl
, newdecl
);
2280 else if (VAR_P (newdecl
)
2281 && (DECL_SIZE (olddecl
) || !DECL_SIZE (newdecl
)))
2283 /* Keep the old RTL. We cannot keep the old RTL if the old
2284 declaration was for an incomplete object and the new
2285 declaration is not since many attributes of the RTL will
2287 COPY_DECL_RTL (olddecl
, newdecl
);
2290 /* If cannot merge, then use the new type and qualifiers,
2291 and don't preserve the old rtl. */
2294 /* Clean out any memory we had of the old declaration. */
2295 tree oldstatic
= value_member (olddecl
, static_aggregates
);
2297 TREE_VALUE (oldstatic
) = error_mark_node
;
2299 TREE_TYPE (olddecl
) = TREE_TYPE (newdecl
);
2300 TREE_READONLY (olddecl
) = TREE_READONLY (newdecl
);
2301 TREE_THIS_VOLATILE (olddecl
) = TREE_THIS_VOLATILE (newdecl
);
2302 TREE_NOTHROW (olddecl
) = TREE_NOTHROW (newdecl
);
2303 TREE_SIDE_EFFECTS (olddecl
) = TREE_SIDE_EFFECTS (newdecl
);
2306 /* Merge the storage class information. */
2307 merge_weak (newdecl
, olddecl
);
2309 DECL_DEFER_OUTPUT (newdecl
) |= DECL_DEFER_OUTPUT (olddecl
);
2310 TREE_PUBLIC (newdecl
) = TREE_PUBLIC (olddecl
);
2311 TREE_STATIC (olddecl
) = TREE_STATIC (newdecl
) |= TREE_STATIC (olddecl
);
2312 if (! DECL_EXTERNAL (olddecl
))
2313 DECL_EXTERNAL (newdecl
) = 0;
2314 if (! DECL_COMDAT (olddecl
))
2315 DECL_COMDAT (newdecl
) = 0;
2317 new_template_info
= NULL_TREE
;
2318 if (DECL_LANG_SPECIFIC (newdecl
) && DECL_LANG_SPECIFIC (olddecl
))
2320 bool new_redefines_gnu_inline
= false;
2322 if (new_defines_function
2323 && ((DECL_INTERFACE_KNOWN (olddecl
)
2324 && TREE_CODE (olddecl
) == FUNCTION_DECL
)
2325 || (TREE_CODE (olddecl
) == TEMPLATE_DECL
2326 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl
))
2327 == FUNCTION_DECL
))))
2331 if (TREE_CODE (fn
) == TEMPLATE_DECL
)
2332 fn
= DECL_TEMPLATE_RESULT (olddecl
);
2334 new_redefines_gnu_inline
= GNU_INLINE_P (fn
) && DECL_INITIAL (fn
);
2337 if (!new_redefines_gnu_inline
)
2339 DECL_INTERFACE_KNOWN (newdecl
) |= DECL_INTERFACE_KNOWN (olddecl
);
2340 DECL_NOT_REALLY_EXTERN (newdecl
) |= DECL_NOT_REALLY_EXTERN (olddecl
);
2341 DECL_COMDAT (newdecl
) |= DECL_COMDAT (olddecl
);
2343 DECL_TEMPLATE_INSTANTIATED (newdecl
)
2344 |= DECL_TEMPLATE_INSTANTIATED (olddecl
);
2345 DECL_ODR_USED (newdecl
) |= DECL_ODR_USED (olddecl
);
2347 /* If the OLDDECL is an instantiation and/or specialization,
2348 then the NEWDECL must be too. But, it may not yet be marked
2349 as such if the caller has created NEWDECL, but has not yet
2350 figured out that it is a redeclaration. */
2351 if (!DECL_USE_TEMPLATE (newdecl
))
2352 DECL_USE_TEMPLATE (newdecl
) = DECL_USE_TEMPLATE (olddecl
);
2354 /* Don't really know how much of the language-specific
2355 values we should copy from old to new. */
2356 DECL_IN_AGGR_P (newdecl
) = DECL_IN_AGGR_P (olddecl
);
2357 DECL_REPO_AVAILABLE_P (newdecl
) = DECL_REPO_AVAILABLE_P (olddecl
);
2358 DECL_INITIALIZED_IN_CLASS_P (newdecl
)
2359 |= DECL_INITIALIZED_IN_CLASS_P (olddecl
);
2361 if (LANG_DECL_HAS_MIN (newdecl
))
2363 DECL_LANG_SPECIFIC (newdecl
)->u
.min
.u2
=
2364 DECL_LANG_SPECIFIC (olddecl
)->u
.min
.u2
;
2365 if (DECL_TEMPLATE_INFO (newdecl
))
2367 new_template_info
= DECL_TEMPLATE_INFO (newdecl
);
2368 if (DECL_TEMPLATE_INSTANTIATION (olddecl
)
2369 && DECL_TEMPLATE_SPECIALIZATION (newdecl
))
2370 /* Remember the presence of explicit specialization args. */
2371 TINFO_USED_TEMPLATE_ID (DECL_TEMPLATE_INFO (olddecl
))
2372 = TINFO_USED_TEMPLATE_ID (new_template_info
);
2374 DECL_TEMPLATE_INFO (newdecl
) = DECL_TEMPLATE_INFO (olddecl
);
2376 /* Only functions have these fields. */
2377 if (DECL_DECLARES_FUNCTION_P (newdecl
))
2379 DECL_NONCONVERTING_P (newdecl
) = DECL_NONCONVERTING_P (olddecl
);
2380 DECL_BEFRIENDING_CLASSES (newdecl
)
2381 = chainon (DECL_BEFRIENDING_CLASSES (newdecl
),
2382 DECL_BEFRIENDING_CLASSES (olddecl
));
2383 /* DECL_THUNKS is only valid for virtual functions,
2384 otherwise it is a DECL_FRIEND_CONTEXT. */
2385 if (DECL_VIRTUAL_P (newdecl
))
2386 SET_DECL_THUNKS (newdecl
, DECL_THUNKS (olddecl
));
2388 /* Only variables have this field. */
2389 else if (VAR_P (newdecl
)
2390 && VAR_HAD_UNKNOWN_BOUND (olddecl
))
2391 SET_VAR_HAD_UNKNOWN_BOUND (newdecl
);
2394 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2398 /* Merge parameter attributes. */
2399 tree oldarg
, newarg
;
2400 for (oldarg
= DECL_ARGUMENTS(olddecl
),
2401 newarg
= DECL_ARGUMENTS(newdecl
);
2403 oldarg
= DECL_CHAIN(oldarg
), newarg
= DECL_CHAIN(newarg
)) {
2404 DECL_ATTRIBUTES (newarg
)
2405 = (*targetm
.merge_decl_attributes
) (oldarg
, newarg
);
2406 DECL_ATTRIBUTES (oldarg
) = DECL_ATTRIBUTES (newarg
);
2409 if (DECL_TEMPLATE_INSTANTIATION (olddecl
)
2410 && !DECL_TEMPLATE_INSTANTIATION (newdecl
))
2412 /* If newdecl is not a specialization, then it is not a
2413 template-related function at all. And that means that we
2414 should have exited above, returning 0. */
2415 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl
));
2417 if (DECL_ODR_USED (olddecl
))
2418 /* From [temp.expl.spec]:
2420 If a template, a member template or the member of a class
2421 template is explicitly specialized then that
2422 specialization shall be declared before the first use of
2423 that specialization that would cause an implicit
2424 instantiation to take place, in every translation unit in
2425 which such a use occurs. */
2426 error ("explicit specialization of %qD after first use",
2429 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl
);
2430 DECL_COMDAT (newdecl
) = (TREE_PUBLIC (newdecl
)
2431 && DECL_DECLARED_INLINE_P (newdecl
));
2433 /* Don't propagate visibility from the template to the
2434 specialization here. We'll do that in determine_visibility if
2436 DECL_VISIBILITY_SPECIFIED (olddecl
) = 0;
2438 /* [temp.expl.spec/14] We don't inline explicit specialization
2439 just because the primary template says so. */
2440 gcc_assert (!merge_attr
);
2442 DECL_DECLARED_INLINE_P (olddecl
)
2443 = DECL_DECLARED_INLINE_P (newdecl
);
2445 DECL_DISREGARD_INLINE_LIMITS (olddecl
)
2446 = DECL_DISREGARD_INLINE_LIMITS (newdecl
);
2448 DECL_UNINLINABLE (olddecl
) = DECL_UNINLINABLE (newdecl
);
2450 else if (new_defines_function
&& DECL_INITIAL (olddecl
))
2452 /* Never inline re-defined extern inline functions.
2453 FIXME: this could be better handled by keeping both
2454 function as separate declarations. */
2455 DECL_UNINLINABLE (newdecl
) = 1;
2459 if (DECL_PENDING_INLINE_P (olddecl
))
2461 DECL_PENDING_INLINE_P (newdecl
) = 1;
2462 DECL_PENDING_INLINE_INFO (newdecl
)
2463 = DECL_PENDING_INLINE_INFO (olddecl
);
2465 else if (DECL_PENDING_INLINE_P (newdecl
))
2467 else if (DECL_SAVED_FUNCTION_DATA (newdecl
) == NULL
)
2468 DECL_SAVED_FUNCTION_DATA (newdecl
)
2469 = DECL_SAVED_FUNCTION_DATA (olddecl
);
2471 DECL_DECLARED_INLINE_P (newdecl
) |= DECL_DECLARED_INLINE_P (olddecl
);
2473 DECL_UNINLINABLE (newdecl
) = DECL_UNINLINABLE (olddecl
)
2474 = (DECL_UNINLINABLE (newdecl
) || DECL_UNINLINABLE (olddecl
));
2476 DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2477 = DECL_DISREGARD_INLINE_LIMITS (olddecl
)
2478 = (DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2479 || DECL_DISREGARD_INLINE_LIMITS (olddecl
));
2482 /* Preserve abstractness on cloned [cd]tors. */
2483 DECL_ABSTRACT_P (newdecl
) = DECL_ABSTRACT_P (olddecl
);
2485 /* Update newdecl's parms to point at olddecl. */
2486 for (parm
= DECL_ARGUMENTS (newdecl
); parm
;
2487 parm
= DECL_CHAIN (parm
))
2488 DECL_CONTEXT (parm
) = olddecl
;
2492 SET_DECL_LANGUAGE (olddecl
, DECL_LANGUAGE (newdecl
));
2493 COPY_DECL_ASSEMBLER_NAME (newdecl
, olddecl
);
2494 COPY_DECL_RTL (newdecl
, olddecl
);
2496 if (! types_match
|| new_defines_function
)
2498 /* These need to be copied so that the names are available.
2499 Note that if the types do match, we'll preserve inline
2500 info and other bits, but if not, we won't. */
2501 DECL_ARGUMENTS (olddecl
) = DECL_ARGUMENTS (newdecl
);
2502 DECL_RESULT (olddecl
) = DECL_RESULT (newdecl
);
2504 /* If redeclaring a builtin function, it stays built in
2505 if newdecl is a gnu_inline definition, or if newdecl is just
2507 if (fndecl_built_in_p (olddecl
)
2508 && (new_defines_function
? GNU_INLINE_P (newdecl
) : types_match
))
2510 DECL_BUILT_IN_CLASS (newdecl
) = DECL_BUILT_IN_CLASS (olddecl
);
2511 DECL_FUNCTION_CODE (newdecl
) = DECL_FUNCTION_CODE (olddecl
);
2512 /* If we're keeping the built-in definition, keep the rtl,
2513 regardless of declaration matches. */
2514 COPY_DECL_RTL (olddecl
, newdecl
);
2515 if (DECL_BUILT_IN_CLASS (newdecl
) == BUILT_IN_NORMAL
)
2517 enum built_in_function fncode
= DECL_FUNCTION_CODE (newdecl
);
2520 /* If a compatible prototype of these builtin functions
2521 is seen, assume the runtime implements it with the
2522 expected semantics. */
2523 case BUILT_IN_STPCPY
:
2524 if (builtin_decl_explicit_p (fncode
))
2525 set_builtin_decl_implicit_p (fncode
, true);
2528 if (builtin_decl_explicit_p (fncode
))
2529 set_builtin_decl_declared_p (fncode
, true);
2534 copy_attributes_to_builtin (newdecl
);
2536 if (new_defines_function
)
2537 /* If defining a function declared with other language
2538 linkage, use the previously declared language linkage. */
2539 SET_DECL_LANGUAGE (newdecl
, DECL_LANGUAGE (olddecl
));
2540 else if (types_match
)
2542 DECL_RESULT (newdecl
) = DECL_RESULT (olddecl
);
2543 /* Don't clear out the arguments if we're just redeclaring a
2545 if (DECL_ARGUMENTS (olddecl
))
2546 DECL_ARGUMENTS (newdecl
) = DECL_ARGUMENTS (olddecl
);
2549 else if (TREE_CODE (newdecl
) == NAMESPACE_DECL
)
2550 NAMESPACE_LEVEL (newdecl
) = NAMESPACE_LEVEL (olddecl
);
2552 /* Now preserve various other info from the definition. */
2553 TREE_ADDRESSABLE (newdecl
) = TREE_ADDRESSABLE (olddecl
);
2554 TREE_ASM_WRITTEN (newdecl
) = TREE_ASM_WRITTEN (olddecl
);
2555 DECL_COMMON (newdecl
) = DECL_COMMON (olddecl
);
2556 COPY_DECL_ASSEMBLER_NAME (olddecl
, newdecl
);
2558 /* Warn about conflicting visibility specifications. */
2559 if (DECL_VISIBILITY_SPECIFIED (olddecl
)
2560 && DECL_VISIBILITY_SPECIFIED (newdecl
)
2561 && DECL_VISIBILITY (newdecl
) != DECL_VISIBILITY (olddecl
))
2563 auto_diagnostic_group d
;
2564 if (warning_at (newdecl_loc
, OPT_Wattributes
,
2565 "%qD: visibility attribute ignored because it "
2566 "conflicts with previous declaration", newdecl
))
2567 inform (olddecl_loc
,
2568 "previous declaration of %qD", olddecl
);
2570 /* Choose the declaration which specified visibility. */
2571 if (DECL_VISIBILITY_SPECIFIED (olddecl
))
2573 DECL_VISIBILITY (newdecl
) = DECL_VISIBILITY (olddecl
);
2574 DECL_VISIBILITY_SPECIFIED (newdecl
) = 1;
2576 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2577 so keep this behavior. */
2578 if (VAR_P (newdecl
) && DECL_HAS_INIT_PRIORITY_P (newdecl
))
2580 SET_DECL_INIT_PRIORITY (olddecl
, DECL_INIT_PRIORITY (newdecl
));
2581 DECL_HAS_INIT_PRIORITY_P (olddecl
) = 1;
2583 /* Likewise for DECL_ALIGN, DECL_USER_ALIGN and DECL_PACKED. */
2584 if (DECL_ALIGN (olddecl
) > DECL_ALIGN (newdecl
))
2586 SET_DECL_ALIGN (newdecl
, DECL_ALIGN (olddecl
));
2587 DECL_USER_ALIGN (newdecl
) |= DECL_USER_ALIGN (olddecl
);
2589 DECL_USER_ALIGN (olddecl
) = DECL_USER_ALIGN (newdecl
);
2590 if (DECL_WARN_IF_NOT_ALIGN (olddecl
)
2591 > DECL_WARN_IF_NOT_ALIGN (newdecl
))
2592 SET_DECL_WARN_IF_NOT_ALIGN (newdecl
,
2593 DECL_WARN_IF_NOT_ALIGN (olddecl
));
2594 if (TREE_CODE (newdecl
) == FIELD_DECL
)
2595 DECL_PACKED (olddecl
) = DECL_PACKED (newdecl
);
2597 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2598 with that from NEWDECL below. */
2599 if (DECL_LANG_SPECIFIC (olddecl
))
2601 gcc_assert (DECL_LANG_SPECIFIC (olddecl
)
2602 != DECL_LANG_SPECIFIC (newdecl
));
2603 ggc_free (DECL_LANG_SPECIFIC (olddecl
));
2606 /* Merge the USED information. */
2607 if (TREE_USED (olddecl
))
2608 TREE_USED (newdecl
) = 1;
2609 else if (TREE_USED (newdecl
))
2610 TREE_USED (olddecl
) = 1;
2611 if (VAR_P (newdecl
))
2613 if (DECL_READ_P (olddecl
))
2614 DECL_READ_P (newdecl
) = 1;
2615 else if (DECL_READ_P (newdecl
))
2616 DECL_READ_P (olddecl
) = 1;
2618 if (DECL_PRESERVE_P (olddecl
))
2619 DECL_PRESERVE_P (newdecl
) = 1;
2620 else if (DECL_PRESERVE_P (newdecl
))
2621 DECL_PRESERVE_P (olddecl
) = 1;
2623 /* Merge the DECL_FUNCTION_VERSIONED information. newdecl will be copied
2624 to olddecl and deleted. */
2625 if (TREE_CODE (newdecl
) == FUNCTION_DECL
2626 && DECL_FUNCTION_VERSIONED (olddecl
))
2628 /* Set the flag for newdecl so that it gets copied to olddecl. */
2629 DECL_FUNCTION_VERSIONED (newdecl
) = 1;
2630 /* newdecl will be purged after copying to olddecl and is no longer
2632 cgraph_node::delete_function_version_by_decl (newdecl
);
2635 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2638 struct symtab_node
*snode
= symtab_node::get (olddecl
);
2640 function_size
= sizeof (struct tree_decl_common
);
2642 memcpy ((char *) olddecl
+ sizeof (struct tree_common
),
2643 (char *) newdecl
+ sizeof (struct tree_common
),
2644 function_size
- sizeof (struct tree_common
));
2646 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2647 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2648 sizeof (struct tree_function_decl
) - sizeof (struct tree_decl_common
));
2650 /* Preserve symtab node mapping. */
2651 olddecl
->decl_with_vis
.symtab_node
= snode
;
2653 if (new_template_info
)
2654 /* If newdecl is a template instantiation, it is possible that
2655 the following sequence of events has occurred:
2657 o A friend function was declared in a class template. The
2658 class template was instantiated.
2660 o The instantiation of the friend declaration was
2661 recorded on the instantiation list, and is newdecl.
2663 o Later, however, instantiate_class_template called pushdecl
2664 on the newdecl to perform name injection. But, pushdecl in
2665 turn called duplicate_decls when it discovered that another
2666 declaration of a global function with the same name already
2669 o Here, in duplicate_decls, we decided to clobber newdecl.
2671 If we're going to do that, we'd better make sure that
2672 olddecl, and not newdecl, is on the list of
2673 instantiations so that if we try to do the instantiation
2674 again we won't get the clobbered declaration. */
2675 reregister_specialization (newdecl
,
2681 size_t size
= tree_code_size (TREE_CODE (newdecl
));
2683 memcpy ((char *) olddecl
+ sizeof (struct tree_common
),
2684 (char *) newdecl
+ sizeof (struct tree_common
),
2685 sizeof (struct tree_decl_common
) - sizeof (struct tree_common
));
2686 switch (TREE_CODE (newdecl
))
2696 struct symtab_node
*snode
= NULL
;
2699 && (TREE_STATIC (olddecl
) || TREE_PUBLIC (olddecl
)
2700 || DECL_EXTERNAL (olddecl
)))
2701 snode
= symtab_node::get (olddecl
);
2702 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2703 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2704 size
- sizeof (struct tree_decl_common
)
2705 + TREE_CODE_LENGTH (TREE_CODE (newdecl
)) * sizeof (char *));
2706 if (VAR_P (newdecl
))
2707 olddecl
->decl_with_vis
.symtab_node
= snode
;
2711 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2712 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2713 sizeof (struct tree_decl_non_common
) - sizeof (struct tree_decl_common
)
2714 + TREE_CODE_LENGTH (TREE_CODE (newdecl
)) * sizeof (char *));
2719 if (VAR_OR_FUNCTION_DECL_P (newdecl
))
2721 if (DECL_EXTERNAL (olddecl
)
2722 || TREE_PUBLIC (olddecl
)
2723 || TREE_STATIC (olddecl
))
2725 /* Merge the section attribute.
2726 We want to issue an error if the sections conflict but that must be
2727 done later in decl_attributes since we are called before attributes
2729 if (DECL_SECTION_NAME (newdecl
) != NULL
)
2730 set_decl_section_name (olddecl
, DECL_SECTION_NAME (newdecl
));
2732 if (DECL_ONE_ONLY (newdecl
))
2734 struct symtab_node
*oldsym
, *newsym
;
2735 if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
2736 oldsym
= cgraph_node::get_create (olddecl
);
2738 oldsym
= varpool_node::get_create (olddecl
);
2739 newsym
= symtab_node::get (newdecl
);
2740 oldsym
->set_comdat_group (newsym
->get_comdat_group ());
2745 && CP_DECL_THREAD_LOCAL_P (newdecl
))
2747 CP_DECL_THREAD_LOCAL_P (olddecl
) = true;
2748 if (!processing_template_decl
)
2749 set_decl_tls_model (olddecl
, DECL_TLS_MODEL (newdecl
));
2753 DECL_UID (olddecl
) = olddecl_uid
;
2755 DECL_FRIEND_P (olddecl
) = 1;
2758 DECL_ANTICIPATED (olddecl
) = 1;
2759 DECL_HIDDEN_FRIEND_P (olddecl
) = 1;
2762 /* NEWDECL contains the merged attribute lists.
2763 Update OLDDECL to be the same. */
2764 DECL_ATTRIBUTES (olddecl
) = DECL_ATTRIBUTES (newdecl
);
2766 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2767 so that encode_section_info has a chance to look at the new decl
2768 flags and attributes. */
2769 if (DECL_RTL_SET_P (olddecl
)
2770 && (TREE_CODE (olddecl
) == FUNCTION_DECL
2772 && TREE_STATIC (olddecl
))))
2773 make_decl_rtl (olddecl
);
2775 /* The NEWDECL will no longer be needed. Because every out-of-class
2776 declaration of a member results in a call to duplicate_decls,
2777 freeing these nodes represents in a significant savings.
2779 Before releasing the node, be sore to remove function from symbol
2780 table that might have been inserted there to record comdat group.
2781 Be sure to however do not free DECL_STRUCT_FUNCTION because this
2782 structure is shared in between newdecl and oldecl. */
2783 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2784 DECL_STRUCT_FUNCTION (newdecl
) = NULL
;
2785 if (VAR_OR_FUNCTION_DECL_P (newdecl
))
2787 struct symtab_node
*snode
= symtab_node::get (newdecl
);
2792 /* Remove the associated constraints for newdecl, if any, before
2793 reclaiming memory. */
2795 remove_constraints (newdecl
);
2802 /* Return zero if the declaration NEWDECL is valid
2803 when the declaration OLDDECL (assumed to be for the same name)
2804 has already been seen.
2805 Otherwise return an error message format string with a %s
2806 where the identifier should go. */
2809 redeclaration_error_message (tree newdecl
, tree olddecl
)
2811 if (TREE_CODE (newdecl
) == TYPE_DECL
)
2813 /* Because C++ can put things into name space for free,
2814 constructs like "typedef struct foo { ... } foo"
2815 would look like an erroneous redeclaration. */
2816 if (same_type_p (TREE_TYPE (newdecl
), TREE_TYPE (olddecl
)))
2819 return G_("redefinition of %q#D");
2821 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2823 /* If this is a pure function, its olddecl will actually be
2824 the original initialization to `0' (which we force to call
2825 abort()). Don't complain about redefinition in this case. */
2826 if (DECL_LANG_SPECIFIC (olddecl
) && DECL_PURE_VIRTUAL_P (olddecl
)
2827 && DECL_INITIAL (olddecl
) == NULL_TREE
)
2830 /* If both functions come from different namespaces, this is not
2831 a redeclaration - this is a conflict with a used function. */
2832 if (DECL_NAMESPACE_SCOPE_P (olddecl
)
2833 && DECL_CONTEXT (olddecl
) != DECL_CONTEXT (newdecl
)
2834 && ! decls_match (olddecl
, newdecl
))
2835 return G_("%qD conflicts with used function");
2837 /* We'll complain about linkage mismatches in
2838 warn_extern_redeclared_static. */
2840 /* Defining the same name twice is no good. */
2841 if (decl_defined_p (olddecl
)
2842 && decl_defined_p (newdecl
))
2844 if (DECL_NAME (olddecl
) == NULL_TREE
)
2845 return G_("%q#D not declared in class");
2846 else if (!GNU_INLINE_P (olddecl
)
2847 || GNU_INLINE_P (newdecl
))
2848 return G_("redefinition of %q#D");
2851 if (DECL_DECLARED_INLINE_P (olddecl
) && DECL_DECLARED_INLINE_P (newdecl
))
2853 bool olda
= GNU_INLINE_P (olddecl
);
2854 bool newa
= GNU_INLINE_P (newdecl
);
2859 return G_("%q+D redeclared inline with "
2860 "%<gnu_inline%> attribute");
2862 return G_("%q+D redeclared inline without "
2863 "%<gnu_inline%> attribute");
2867 check_abi_tag_redeclaration
2868 (olddecl
, lookup_attribute ("abi_tag", DECL_ATTRIBUTES (olddecl
)),
2869 lookup_attribute ("abi_tag", DECL_ATTRIBUTES (newdecl
)));
2873 else if (TREE_CODE (newdecl
) == TEMPLATE_DECL
)
2877 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) == TYPE_DECL
)
2879 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl
))
2880 && COMPLETE_TYPE_P (TREE_TYPE (olddecl
)))
2881 return G_("redefinition of %q#D");
2885 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl
)) != FUNCTION_DECL
2886 || (DECL_TEMPLATE_RESULT (newdecl
)
2887 == DECL_TEMPLATE_RESULT (olddecl
)))
2890 nt
= DECL_TEMPLATE_RESULT (newdecl
);
2891 if (DECL_TEMPLATE_INFO (nt
))
2892 nt
= DECL_TEMPLATE_RESULT (template_for_substitution (nt
));
2893 ot
= DECL_TEMPLATE_RESULT (olddecl
);
2894 if (DECL_TEMPLATE_INFO (ot
))
2895 ot
= DECL_TEMPLATE_RESULT (template_for_substitution (ot
));
2896 if (DECL_INITIAL (nt
) && DECL_INITIAL (ot
)
2897 && (!GNU_INLINE_P (ot
) || GNU_INLINE_P (nt
)))
2898 return G_("redefinition of %q#D");
2900 if (DECL_DECLARED_INLINE_P (ot
) && DECL_DECLARED_INLINE_P (nt
))
2902 bool olda
= GNU_INLINE_P (ot
);
2903 bool newa
= GNU_INLINE_P (nt
);
2908 return G_("%q+D redeclared inline with "
2909 "%<gnu_inline%> attribute");
2911 return G_("%q+D redeclared inline without "
2912 "%<gnu_inline%> attribute");
2916 /* Core issue #226 (C++0x):
2918 If a friend function template declaration specifies a
2919 default template-argument, that declaration shall be a
2920 definition and shall be the only declaration of the
2921 function template in the translation unit. */
2922 if ((cxx_dialect
!= cxx98
)
2923 && TREE_CODE (ot
) == FUNCTION_DECL
&& DECL_FRIEND_P (ot
)
2924 && !check_default_tmpl_args (nt
, DECL_TEMPLATE_PARMS (newdecl
),
2925 /*is_primary=*/true,
2926 /*is_partial=*/false,
2927 /*is_friend_decl=*/2))
2928 return G_("redeclaration of friend %q#D "
2929 "may not have default template arguments");
2933 else if (VAR_P (newdecl
)
2934 && CP_DECL_THREAD_LOCAL_P (newdecl
) != CP_DECL_THREAD_LOCAL_P (olddecl
)
2935 && (! DECL_LANG_SPECIFIC (olddecl
)
2936 || ! CP_DECL_THREADPRIVATE_P (olddecl
)
2937 || CP_DECL_THREAD_LOCAL_P (newdecl
)))
2939 /* Only variables can be thread-local, and all declarations must
2940 agree on this property. */
2941 if (CP_DECL_THREAD_LOCAL_P (newdecl
))
2942 return G_("thread-local declaration of %q#D follows "
2943 "non-thread-local declaration");
2945 return G_("non-thread-local declaration of %q#D follows "
2946 "thread-local declaration");
2948 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl
))
2950 /* The objects have been declared at namespace scope. If either
2951 is a member of an anonymous union, then this is an invalid
2952 redeclaration. For example:
2958 if ((VAR_P (newdecl
) && DECL_ANON_UNION_VAR_P (newdecl
))
2959 || (VAR_P (olddecl
) && DECL_ANON_UNION_VAR_P (olddecl
)))
2960 return G_("redeclaration of %q#D");
2961 /* If at least one declaration is a reference, there is no
2962 conflict. For example:
2968 if (DECL_EXTERNAL (newdecl
) || DECL_EXTERNAL (olddecl
))
2971 /* Static data member declared outside a class definition
2972 if the variable is defined within the class with constexpr
2973 specifier is declaration rather than definition (and
2975 if (cxx_dialect
>= cxx17
2977 && DECL_CLASS_SCOPE_P (olddecl
)
2978 && DECL_DECLARED_CONSTEXPR_P (olddecl
)
2979 && !DECL_INITIAL (newdecl
))
2981 DECL_EXTERNAL (newdecl
) = 1;
2982 /* For now, only warn with explicit -Wdeprecated. */
2983 if (global_options_set
.x_warn_deprecated
)
2985 auto_diagnostic_group d
;
2986 if (warning_at (DECL_SOURCE_LOCATION (newdecl
), OPT_Wdeprecated
,
2987 "redundant redeclaration of %<constexpr%> "
2988 "static data member %qD", newdecl
))
2989 inform (DECL_SOURCE_LOCATION (olddecl
),
2990 "previous declaration of %qD", olddecl
);
2995 /* Reject two definitions. */
2996 return G_("redefinition of %q#D");
3000 /* Objects declared with block scope: */
3001 /* Reject two definitions, and reject a definition
3002 together with an external reference. */
3003 if (!(DECL_EXTERNAL (newdecl
) && DECL_EXTERNAL (olddecl
)))
3004 return G_("redeclaration of %q#D");
3010 /* Hash and equality functions for the named_label table. */
3013 named_label_hash::hash (const value_type entry
)
3015 return IDENTIFIER_HASH_VALUE (entry
->name
);
3019 named_label_hash::equal (const value_type entry
, compare_type name
)
3021 return name
== entry
->name
;
3024 /* Look for a label named ID in the current function. If one cannot
3025 be found, create one. Return the named_label_entry, or NULL on
3028 static named_label_entry
*
3029 lookup_label_1 (tree id
, bool making_local_p
)
3031 /* You can't use labels at global scope. */
3032 if (current_function_decl
== NULL_TREE
)
3034 error ("label %qE referenced outside of any function", id
);
3039 named_labels
= hash_table
<named_label_hash
>::create_ggc (13);
3041 hashval_t hash
= IDENTIFIER_HASH_VALUE (id
);
3042 named_label_entry
**slot
3043 = named_labels
->find_slot_with_hash (id
, hash
, INSERT
);
3044 named_label_entry
*old
= *slot
;
3046 if (old
&& old
->label_decl
)
3048 if (!making_local_p
)
3051 if (old
->binding_level
== current_binding_level
)
3053 error ("local label %qE conflicts with existing label", id
);
3054 inform (DECL_SOURCE_LOCATION (old
->label_decl
), "previous label");
3059 /* We are making a new decl, create or reuse the named_label_entry */
3060 named_label_entry
*ent
= NULL
;
3061 if (old
&& !old
->label_decl
)
3065 ent
= ggc_cleared_alloc
<named_label_entry
> ();
3071 /* Now create the LABEL_DECL. */
3072 tree decl
= build_decl (input_location
, LABEL_DECL
, id
, void_type_node
);
3074 DECL_CONTEXT (decl
) = current_function_decl
;
3075 SET_DECL_MODE (decl
, VOIDmode
);
3078 C_DECLARED_LABEL_FLAG (decl
) = true;
3079 DECL_CHAIN (decl
) = current_binding_level
->names
;
3080 current_binding_level
->names
= decl
;
3083 ent
->label_decl
= decl
;
3088 /* Wrapper for lookup_label_1. */
3091 lookup_label (tree id
)
3093 bool subtime
= timevar_cond_start (TV_NAME_LOOKUP
);
3094 named_label_entry
*ent
= lookup_label_1 (id
, false);
3095 timevar_cond_stop (TV_NAME_LOOKUP
, subtime
);
3096 return ent
? ent
->label_decl
: NULL_TREE
;
3100 declare_local_label (tree id
)
3102 bool subtime
= timevar_cond_start (TV_NAME_LOOKUP
);
3103 named_label_entry
*ent
= lookup_label_1 (id
, true);
3104 timevar_cond_stop (TV_NAME_LOOKUP
, subtime
);
3105 return ent
? ent
->label_decl
: NULL_TREE
;
3108 /* Returns nonzero if it is ill-formed to jump past the declaration of
3109 DECL. Returns 2 if it's also a real problem. */
3112 decl_jump_unsafe (tree decl
)
3114 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
3115 with automatic storage duration is not in scope to a point where it is
3116 in scope is ill-formed unless the variable has scalar type, class type
3117 with a trivial default constructor and a trivial destructor, a
3118 cv-qualified version of one of these types, or an array of one of the
3119 preceding types and is declared without an initializer (8.5). */
3120 tree type
= TREE_TYPE (decl
);
3122 if (!VAR_P (decl
) || TREE_STATIC (decl
)
3123 || type
== error_mark_node
)
3126 if (DECL_NONTRIVIALLY_INITIALIZED_P (decl
)
3127 || variably_modified_type_p (type
, NULL_TREE
))
3130 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
))
3136 /* A subroutine of check_previous_goto_1 and check_goto to identify a branch
3140 identify_goto (tree decl
, location_t loc
, const location_t
*locus
,
3141 diagnostic_t diag_kind
)
3144 = emit_diagnostic (diag_kind
, loc
, 0,
3145 decl
? N_("jump to label %qD")
3146 : N_("jump to case label"), decl
);
3147 if (complained
&& locus
)
3148 inform (*locus
, " from here");
3152 /* Check that a single previously seen jump to a newly defined label
3153 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
3154 the jump context; NAMES are the names in scope in LEVEL at the jump
3155 context; LOCUS is the source position of the jump or 0. Returns
3156 true if all is well. */
3159 check_previous_goto_1 (tree decl
, cp_binding_level
* level
, tree names
,
3160 bool exited_omp
, const location_t
*locus
)
3162 cp_binding_level
*b
;
3163 bool complained
= false;
3165 bool saw_eh
= false, saw_omp
= false, saw_tm
= false, saw_cxif
= false;
3169 complained
= identify_goto (decl
, input_location
, locus
, DK_ERROR
);
3171 inform (input_location
, " exits OpenMP structured block");
3176 for (b
= current_binding_level
; b
; b
= b
->level_chain
)
3178 tree new_decls
, old_decls
= (b
== level
? names
: NULL_TREE
);
3180 for (new_decls
= b
->names
; new_decls
!= old_decls
;
3181 new_decls
= (DECL_P (new_decls
) ? DECL_CHAIN (new_decls
)
3182 : TREE_CHAIN (new_decls
)))
3184 int problem
= decl_jump_unsafe (new_decls
);
3190 complained
= identify_goto (decl
, input_location
, locus
,
3192 ? DK_ERROR
: DK_PERMERROR
);
3198 inform (DECL_SOURCE_LOCATION (new_decls
),
3199 " crosses initialization of %q#D", new_decls
);
3201 inform (DECL_SOURCE_LOCATION (new_decls
),
3202 " enters scope of %q#D, which has "
3203 "non-trivial destructor", new_decls
);
3210 const char *inf
= NULL
;
3211 location_t loc
= input_location
;
3216 inf
= N_("enters try block");
3222 inf
= N_("enters catch block");
3228 inf
= N_("enters OpenMP structured block");
3232 case sk_transaction
:
3234 inf
= N_("enters synchronized or atomic statement");
3239 if (!saw_cxif
&& level_for_constexpr_if (b
->level_chain
))
3241 inf
= N_("enters constexpr if statement");
3242 loc
= EXPR_LOCATION (b
->level_chain
->this_entity
);
3254 complained
= identify_goto (decl
, input_location
, locus
, DK_ERROR
);
3257 inform (loc
, " %s", inf
);
3265 check_previous_goto (tree decl
, struct named_label_use_entry
*use
)
3267 check_previous_goto_1 (decl
, use
->binding_level
,
3268 use
->names_in_scope
, use
->in_omp_scope
,
3269 &use
->o_goto_locus
);
3273 check_switch_goto (cp_binding_level
* level
)
3275 return check_previous_goto_1 (NULL_TREE
, level
, level
->names
, false, NULL
);
3278 /* Check that a new jump to a label DECL is OK. Called by
3279 finish_goto_stmt. */
3282 check_goto (tree decl
)
3284 /* We can't know where a computed goto is jumping.
3285 So we assume that it's OK. */
3286 if (TREE_CODE (decl
) != LABEL_DECL
)
3289 /* We didn't record any information about this label when we created it,
3290 and there's not much point since it's trivial to analyze as a return. */
3291 if (decl
== cdtor_label
)
3294 hashval_t hash
= IDENTIFIER_HASH_VALUE (DECL_NAME (decl
));
3295 named_label_entry
**slot
3296 = named_labels
->find_slot_with_hash (DECL_NAME (decl
), hash
, NO_INSERT
);
3297 named_label_entry
*ent
= *slot
;
3299 /* If the label hasn't been defined yet, defer checking. */
3300 if (! DECL_INITIAL (decl
))
3302 /* Don't bother creating another use if the last goto had the
3303 same data, and will therefore create the same set of errors. */
3305 && ent
->uses
->names_in_scope
== current_binding_level
->names
)
3308 named_label_use_entry
*new_use
3309 = ggc_alloc
<named_label_use_entry
> ();
3310 new_use
->binding_level
= current_binding_level
;
3311 new_use
->names_in_scope
= current_binding_level
->names
;
3312 new_use
->o_goto_locus
= input_location
;
3313 new_use
->in_omp_scope
= false;
3315 new_use
->next
= ent
->uses
;
3316 ent
->uses
= new_use
;
3320 bool saw_catch
= false, complained
= false;
3325 if (ent
->in_try_scope
|| ent
->in_catch_scope
|| ent
->in_transaction_scope
3326 || ent
->in_constexpr_if
3327 || ent
->in_omp_scope
|| !vec_safe_is_empty (ent
->bad_decls
))
3329 diagnostic_t diag_kind
= DK_PERMERROR
;
3330 if (ent
->in_try_scope
|| ent
->in_catch_scope
|| ent
->in_constexpr_if
3331 || ent
->in_transaction_scope
|| ent
->in_omp_scope
)
3332 diag_kind
= DK_ERROR
;
3333 complained
= identify_goto (decl
, DECL_SOURCE_LOCATION (decl
),
3334 &input_location
, diag_kind
);
3335 identified
= 1 + (diag_kind
== DK_ERROR
);
3338 FOR_EACH_VEC_SAFE_ELT (ent
->bad_decls
, ix
, bad
)
3340 int u
= decl_jump_unsafe (bad
);
3342 if (u
> 1 && DECL_ARTIFICIAL (bad
))
3344 /* Can't skip init of __exception_info. */
3345 if (identified
== 1)
3347 complained
= identify_goto (decl
, DECL_SOURCE_LOCATION (decl
),
3348 &input_location
, DK_ERROR
);
3352 inform (DECL_SOURCE_LOCATION (bad
), " enters catch block");
3355 else if (complained
)
3358 inform (DECL_SOURCE_LOCATION (bad
),
3359 " skips initialization of %q#D", bad
);
3361 inform (DECL_SOURCE_LOCATION (bad
),
3362 " enters scope of %q#D which has "
3363 "non-trivial destructor", bad
);
3369 if (ent
->in_try_scope
)
3370 inform (input_location
, " enters try block");
3371 else if (ent
->in_catch_scope
&& !saw_catch
)
3372 inform (input_location
, " enters catch block");
3373 else if (ent
->in_transaction_scope
)
3374 inform (input_location
, " enters synchronized or atomic statement");
3375 else if (ent
->in_constexpr_if
)
3376 inform (input_location
, " enters %<constexpr%> if statement");
3379 if (ent
->in_omp_scope
)
3382 inform (input_location
, " enters OpenMP structured block");
3384 else if (flag_openmp
)
3385 for (cp_binding_level
*b
= current_binding_level
; b
; b
= b
->level_chain
)
3387 if (b
== ent
->binding_level
)
3389 if (b
->kind
== sk_omp
)
3393 complained
= identify_goto (decl
,
3394 DECL_SOURCE_LOCATION (decl
),
3395 &input_location
, DK_ERROR
);
3399 inform (input_location
, " exits OpenMP structured block");
3405 /* Check that a return is ok wrt OpenMP structured blocks.
3406 Called by finish_return_stmt. Returns true if all is well. */
3409 check_omp_return (void)
3411 for (cp_binding_level
*b
= current_binding_level
; b
; b
= b
->level_chain
)
3412 if (b
->kind
== sk_omp
)
3414 error ("invalid exit from OpenMP structured block");
3417 else if (b
->kind
== sk_function_parms
)
3422 /* Define a label, specifying the location in the source file.
3423 Return the LABEL_DECL node for the label. */
3426 define_label_1 (location_t location
, tree name
)
3428 /* After labels, make any new cleanups in the function go into their
3429 own new (temporary) binding contour. */
3430 for (cp_binding_level
*p
= current_binding_level
;
3431 p
->kind
!= sk_function_parms
;
3433 p
->more_cleanups_ok
= 0;
3435 named_label_entry
*ent
= lookup_label_1 (name
, false);
3436 tree decl
= ent
->label_decl
;
3438 if (DECL_INITIAL (decl
) != NULL_TREE
)
3440 error ("duplicate label %qD", decl
);
3441 return error_mark_node
;
3445 /* Mark label as having been defined. */
3446 DECL_INITIAL (decl
) = error_mark_node
;
3447 /* Say where in the source. */
3448 DECL_SOURCE_LOCATION (decl
) = location
;
3450 ent
->binding_level
= current_binding_level
;
3451 ent
->names_in_scope
= current_binding_level
->names
;
3453 for (named_label_use_entry
*use
= ent
->uses
; use
; use
= use
->next
)
3454 check_previous_goto (decl
, use
);
3461 /* Wrapper for define_label_1. */
3464 define_label (location_t location
, tree name
)
3466 bool running
= timevar_cond_start (TV_NAME_LOOKUP
);
3467 tree ret
= define_label_1 (location
, name
);
3468 timevar_cond_stop (TV_NAME_LOOKUP
, running
);
3475 cp_binding_level
*level
;
3476 struct cp_switch
*next
;
3477 /* The SWITCH_STMT being built. */
3479 /* A splay-tree mapping the low element of a case range to the high
3480 element, or NULL_TREE if there is no high element. Used to
3481 determine whether or not a new case label duplicates an old case
3482 label. We need a tree, rather than simply a hash table, because
3483 of the GNU case range extension. */
3485 /* Remember whether there was a case value that is outside the
3486 range of the original type of the controlling expression. */
3487 bool outside_range_p
;
3488 /* Remember whether a default: case label has been seen. */
3490 /* Remember whether a BREAK_STMT has been seen in this SWITCH_STMT. */
3491 bool break_stmt_seen_p
;
3492 /* Set if inside of {FOR,DO,WHILE}_BODY nested inside of a switch,
3493 where BREAK_STMT doesn't belong to the SWITCH_STMT. */
3494 bool in_loop_body_p
;
3497 /* A stack of the currently active switch statements. The innermost
3498 switch statement is on the top of the stack. There is no need to
3499 mark the stack for garbage collection because it is only active
3500 during the processing of the body of a function, and we never
3501 collect at that point. */
3503 static struct cp_switch
*switch_stack
;
3505 /* Called right after a switch-statement condition is parsed.
3506 SWITCH_STMT is the switch statement being parsed. */
3509 push_switch (tree switch_stmt
)
3511 struct cp_switch
*p
= XNEW (struct cp_switch
);
3512 p
->level
= current_binding_level
;
3513 p
->next
= switch_stack
;
3514 p
->switch_stmt
= switch_stmt
;
3515 p
->cases
= splay_tree_new (case_compare
, NULL
, NULL
);
3516 p
->outside_range_p
= false;
3517 p
->has_default_p
= false;
3518 p
->break_stmt_seen_p
= false;
3519 p
->in_loop_body_p
= false;
3526 struct cp_switch
*cs
= switch_stack
;
3527 location_t switch_location
;
3529 /* Emit warnings as needed. */
3530 switch_location
= cp_expr_loc_or_loc (cs
->switch_stmt
, input_location
);
3531 const bool bool_cond_p
3532 = (SWITCH_STMT_TYPE (cs
->switch_stmt
)
3533 && TREE_CODE (SWITCH_STMT_TYPE (cs
->switch_stmt
)) == BOOLEAN_TYPE
);
3534 if (!processing_template_decl
)
3535 c_do_switch_warnings (cs
->cases
, switch_location
,
3536 SWITCH_STMT_TYPE (cs
->switch_stmt
),
3537 SWITCH_STMT_COND (cs
->switch_stmt
),
3538 bool_cond_p
, cs
->outside_range_p
);
3540 /* For the benefit of block_may_fallthru remember if the switch body
3541 case labels cover all possible values and if there are break; stmts. */
3542 if (cs
->has_default_p
3543 || (!processing_template_decl
3544 && c_switch_covers_all_cases_p (cs
->cases
,
3545 SWITCH_STMT_TYPE (cs
->switch_stmt
))))
3546 SWITCH_STMT_ALL_CASES_P (cs
->switch_stmt
) = 1;
3547 if (!cs
->break_stmt_seen_p
)
3548 SWITCH_STMT_NO_BREAK_P (cs
->switch_stmt
) = 1;
3549 gcc_assert (!cs
->in_loop_body_p
);
3550 splay_tree_delete (cs
->cases
);
3551 switch_stack
= switch_stack
->next
;
3555 /* Note that a BREAK_STMT is about to be added. If it is inside of
3556 a SWITCH_STMT and not inside of a loop body inside of it, note
3557 in switch_stack we've seen a BREAK_STMT. */
3560 note_break_stmt (void)
3562 if (switch_stack
&& !switch_stack
->in_loop_body_p
)
3563 switch_stack
->break_stmt_seen_p
= true;
3566 /* Note the start of processing of an iteration statement's body.
3567 The note_break_stmt function will do nothing while processing it.
3568 Return a flag that should be passed to note_iteration_stmt_body_end. */
3571 note_iteration_stmt_body_start (void)
3575 bool ret
= switch_stack
->in_loop_body_p
;
3576 switch_stack
->in_loop_body_p
= true;
3580 /* Note the end of processing of an iteration statement's body. */
3583 note_iteration_stmt_body_end (bool prev
)
3586 switch_stack
->in_loop_body_p
= prev
;
3589 /* Convert a case constant VALUE in a switch to the type TYPE of the switch
3590 condition. Note that if TYPE and VALUE are already integral we don't
3591 really do the conversion because the language-independent
3592 warning/optimization code will work better that way. */
3595 case_conversion (tree type
, tree value
)
3597 if (value
== NULL_TREE
)
3600 value
= mark_rvalue_use (value
);
3602 if (cxx_dialect
>= cxx11
3603 && (SCOPED_ENUM_P (type
)
3604 || !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (value
))))
3606 if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type
))
3607 type
= type_promotes_to (type
);
3608 value
= (perform_implicit_conversion_flags
3609 (type
, value
, tf_warning_or_error
,
3610 LOOKUP_IMPLICIT
| LOOKUP_NO_NON_INTEGRAL
));
3612 return cxx_constant_value (value
);
3615 /* Note that we've seen a definition of a case label, and complain if this
3616 is a bad place for one. */
3619 finish_case_label (location_t loc
, tree low_value
, tree high_value
)
3622 cp_binding_level
*p
;
3625 if (low_value
== NULL_TREE
&& high_value
== NULL_TREE
)
3626 switch_stack
->has_default_p
= true;
3628 if (processing_template_decl
)
3632 /* For templates, just add the case label; we'll do semantic
3633 analysis at instantiation-time. */
3634 label
= build_decl (loc
, LABEL_DECL
, NULL_TREE
, NULL_TREE
);
3635 return add_stmt (build_case_label (low_value
, high_value
, label
));
3638 /* Find the condition on which this switch statement depends. */
3639 cond
= SWITCH_STMT_COND (switch_stack
->switch_stmt
);
3640 if (cond
&& TREE_CODE (cond
) == TREE_LIST
)
3641 cond
= TREE_VALUE (cond
);
3643 if (!check_switch_goto (switch_stack
->level
))
3644 return error_mark_node
;
3646 type
= SWITCH_STMT_TYPE (switch_stack
->switch_stmt
);
3647 if (type
== error_mark_node
)
3648 return error_mark_node
;
3650 low_value
= case_conversion (type
, low_value
);
3651 high_value
= case_conversion (type
, high_value
);
3653 r
= c_add_case_label (loc
, switch_stack
->cases
, cond
, type
,
3654 low_value
, high_value
,
3655 &switch_stack
->outside_range_p
);
3657 /* After labels, make any new cleanups in the function go into their
3658 own new (temporary) binding contour. */
3659 for (p
= current_binding_level
;
3660 p
->kind
!= sk_function_parms
;
3662 p
->more_cleanups_ok
= 0;
3667 struct typename_info
{
3675 struct typename_hasher
: ggc_ptr_hash
<tree_node
>
3677 typedef typename_info
*compare_type
;
3679 /* Hash a TYPENAME_TYPE. */
3686 hash
= (htab_hash_pointer (TYPE_CONTEXT (t
))
3687 ^ htab_hash_pointer (TYPE_IDENTIFIER (t
)));
3692 /* Compare two TYPENAME_TYPEs. */
3695 equal (tree t1
, const typename_info
*t2
)
3697 return (TYPE_IDENTIFIER (t1
) == t2
->name
3698 && TYPE_CONTEXT (t1
) == t2
->scope
3699 && TYPENAME_TYPE_FULLNAME (t1
) == t2
->template_id
3700 && TYPENAME_IS_ENUM_P (t1
) == t2
->enum_p
3701 && TYPENAME_IS_CLASS_P (t1
) == t2
->class_p
);
3705 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
3706 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
3708 Returns the new TYPENAME_TYPE. */
3710 static GTY (()) hash_table
<typename_hasher
> *typename_htab
;
3713 build_typename_type (tree context
, tree name
, tree fullname
,
3714 enum tag_types tag_type
)
3722 if (typename_htab
== NULL
)
3723 typename_htab
= hash_table
<typename_hasher
>::create_ggc (61);
3725 ti
.scope
= FROB_CONTEXT (context
);
3727 ti
.template_id
= fullname
;
3728 ti
.enum_p
= tag_type
== enum_type
;
3729 ti
.class_p
= (tag_type
== class_type
3730 || tag_type
== record_type
3731 || tag_type
== union_type
);
3732 hash
= (htab_hash_pointer (ti
.scope
)
3733 ^ htab_hash_pointer (ti
.name
));
3735 /* See if we already have this type. */
3736 e
= typename_htab
->find_slot_with_hash (&ti
, hash
, INSERT
);
3741 /* Build the TYPENAME_TYPE. */
3742 t
= cxx_make_type (TYPENAME_TYPE
);
3743 TYPE_CONTEXT (t
) = ti
.scope
;
3744 TYPENAME_TYPE_FULLNAME (t
) = ti
.template_id
;
3745 TYPENAME_IS_ENUM_P (t
) = ti
.enum_p
;
3746 TYPENAME_IS_CLASS_P (t
) = ti
.class_p
;
3748 /* Build the corresponding TYPE_DECL. */
3749 d
= build_decl (input_location
, TYPE_DECL
, name
, t
);
3750 TYPE_NAME (TREE_TYPE (d
)) = d
;
3751 TYPE_STUB_DECL (TREE_TYPE (d
)) = d
;
3752 DECL_CONTEXT (d
) = FROB_CONTEXT (context
);
3753 DECL_ARTIFICIAL (d
) = 1;
3755 /* Store it in the hash table. */
3758 /* TYPENAME_TYPEs must always be compared structurally, because
3759 they may or may not resolve down to another type depending on
3760 the currently open classes. */
3761 SET_TYPE_STRUCTURAL_EQUALITY (t
);
3767 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
3768 provided to name the type. Returns an appropriate type, unless an
3769 error occurs, in which case error_mark_node is returned. If we
3770 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
3771 return that, rather than the _TYPE it corresponds to, in other
3772 cases we look through the type decl. If TF_ERROR is set, complain
3773 about errors, otherwise be quiet. */
3776 make_typename_type (tree context
, tree name
, enum tag_types tag_type
,
3777 tsubst_flags_t complain
)
3783 if (name
== error_mark_node
3784 || context
== NULL_TREE
3785 || context
== error_mark_node
)
3786 return error_mark_node
;
3790 if (!(TYPE_LANG_SPECIFIC (name
)
3791 && (CLASSTYPE_IS_TEMPLATE (name
)
3792 || CLASSTYPE_USE_TEMPLATE (name
))))
3793 name
= TYPE_IDENTIFIER (name
);
3795 /* Create a TEMPLATE_ID_EXPR for the type. */
3796 name
= build_nt (TEMPLATE_ID_EXPR
,
3797 CLASSTYPE_TI_TEMPLATE (name
),
3798 CLASSTYPE_TI_ARGS (name
));
3800 else if (TREE_CODE (name
) == TYPE_DECL
)
3801 name
= DECL_NAME (name
);
3805 if (TREE_CODE (name
) == TEMPLATE_ID_EXPR
)
3807 name
= TREE_OPERAND (name
, 0);
3808 if (DECL_TYPE_TEMPLATE_P (name
))
3809 name
= TREE_OPERAND (fullname
, 0) = DECL_NAME (name
);
3810 if (TREE_CODE (name
) != IDENTIFIER_NODE
)
3812 if (complain
& tf_error
)
3813 error ("%qD is not a type", name
);
3814 return error_mark_node
;
3817 if (TREE_CODE (name
) == TEMPLATE_DECL
)
3819 if (complain
& tf_error
)
3820 error ("%qD used without template arguments", name
);
3821 return error_mark_node
;
3823 gcc_assert (identifier_p (name
));
3824 gcc_assert (TYPE_P (context
));
3826 if (!MAYBE_CLASS_TYPE_P (context
))
3828 if (complain
& tf_error
)
3829 error ("%q#T is not a class", context
);
3830 return error_mark_node
;
3833 /* When the CONTEXT is a dependent type, NAME could refer to a
3834 dependent base class of CONTEXT. But look inside it anyway
3835 if CONTEXT is a currently open scope, in case it refers to a
3836 member of the current instantiation or a non-dependent base;
3837 lookup will stop when we hit a dependent base. */
3838 if (!dependent_scope_p (context
))
3839 /* We should only set WANT_TYPE when we're a nested typename type.
3840 Then we can give better diagnostics if we find a non-type. */
3841 t
= lookup_field (context
, name
, 2, /*want_type=*/true);
3845 if ((!t
|| TREE_CODE (t
) == TREE_LIST
) && dependent_type_p (context
))
3846 return build_typename_type (context
, name
, fullname
, tag_type
);
3848 want_template
= TREE_CODE (fullname
) == TEMPLATE_ID_EXPR
;
3852 if (complain
& tf_error
)
3854 if (!COMPLETE_TYPE_P (context
))
3855 cxx_incomplete_type_error (NULL_TREE
, context
);
3857 error (want_template
? G_("no class template named %q#T in %q#T")
3858 : G_("no type named %q#T in %q#T"), name
, context
);
3860 return error_mark_node
;
3863 /* Pull out the template from an injected-class-name (or multiple). */
3865 t
= maybe_get_template_decl_from_type_decl (t
);
3867 if (TREE_CODE (t
) == TREE_LIST
)
3869 if (complain
& tf_error
)
3871 error ("lookup of %qT in %qT is ambiguous", name
, context
);
3872 print_candidates (t
);
3874 return error_mark_node
;
3877 if (want_template
&& !DECL_TYPE_TEMPLATE_P (t
))
3879 if (complain
& tf_error
)
3880 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3882 return error_mark_node
;
3884 if (!want_template
&& TREE_CODE (t
) != TYPE_DECL
)
3886 if (complain
& tf_error
)
3887 error ("%<typename %T::%D%> names %q#T, which is not a type",
3889 return error_mark_node
;
3892 if (!perform_or_defer_access_check (TYPE_BINFO (context
), t
, t
, complain
))
3893 return error_mark_node
;
3895 /* If we are currently parsing a template and if T is a typedef accessed
3896 through CONTEXT then we need to remember and check access of T at
3897 template instantiation time. */
3898 add_typedef_to_current_template_for_access_check (t
, context
, input_location
);
3901 return lookup_template_class (t
, TREE_OPERAND (fullname
, 1),
3903 /*entering_scope=*/0,
3904 complain
| tf_user
);
3906 if (DECL_ARTIFICIAL (t
) || !(complain
& tf_keep_type_decl
))
3909 maybe_record_typedef_use (t
);
3914 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3915 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3916 in which case error_mark_node is returned.
3918 If PARM_LIST is non-NULL, also make sure that the template parameter
3919 list of TEMPLATE_DECL matches.
3921 If COMPLAIN zero, don't complain about any errors that occur. */
3924 make_unbound_class_template (tree context
, tree name
, tree parm_list
,
3925 tsubst_flags_t complain
)
3931 name
= TYPE_IDENTIFIER (name
);
3932 else if (DECL_P (name
))
3933 name
= DECL_NAME (name
);
3934 gcc_assert (identifier_p (name
));
3936 if (!dependent_type_p (context
)
3937 || currently_open_class (context
))
3939 tree tmpl
= NULL_TREE
;
3941 if (MAYBE_CLASS_TYPE_P (context
))
3942 tmpl
= lookup_field (context
, name
, 0, false);
3944 if (tmpl
&& TREE_CODE (tmpl
) == TYPE_DECL
)
3945 tmpl
= maybe_get_template_decl_from_type_decl (tmpl
);
3947 if (!tmpl
|| !DECL_TYPE_TEMPLATE_P (tmpl
))
3949 if (complain
& tf_error
)
3950 error ("no class template named %q#T in %q#T", name
, context
);
3951 return error_mark_node
;
3955 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl
), parm_list
))
3957 if (complain
& tf_error
)
3959 error ("template parameters do not match template %qD", tmpl
);
3960 inform (DECL_SOURCE_LOCATION (tmpl
),
3961 "%qD declared here", tmpl
);
3963 return error_mark_node
;
3966 if (!perform_or_defer_access_check (TYPE_BINFO (context
), tmpl
, tmpl
,
3968 return error_mark_node
;
3973 /* Build the UNBOUND_CLASS_TEMPLATE. */
3974 t
= cxx_make_type (UNBOUND_CLASS_TEMPLATE
);
3975 TYPE_CONTEXT (t
) = FROB_CONTEXT (context
);
3976 TREE_TYPE (t
) = NULL_TREE
;
3977 SET_TYPE_STRUCTURAL_EQUALITY (t
);
3979 /* Build the corresponding TEMPLATE_DECL. */
3980 d
= build_decl (input_location
, TEMPLATE_DECL
, name
, t
);
3981 TYPE_NAME (TREE_TYPE (d
)) = d
;
3982 TYPE_STUB_DECL (TREE_TYPE (d
)) = d
;
3983 DECL_CONTEXT (d
) = FROB_CONTEXT (context
);
3984 DECL_ARTIFICIAL (d
) = 1;
3985 DECL_TEMPLATE_PARMS (d
) = parm_list
;
3992 /* Push the declarations of builtin types into the global namespace.
3993 RID_INDEX is the index of the builtin type in the array
3994 RID_POINTERS. NAME is the name used when looking up the builtin
3995 type. TYPE is the _TYPE node for the builtin type.
3997 The calls to set_global_binding below should be
3998 eliminated. Built-in types should not be looked up name; their
3999 names are keywords that the parser can recognize. However, there
4000 is code in c-common.c that uses identifier_global_value to look up
4001 built-in types by name. */
4004 record_builtin_type (enum rid rid_index
,
4008 tree decl
= NULL_TREE
;
4012 tree tname
= get_identifier (name
);
4013 tree tdecl
= build_decl (BUILTINS_LOCATION
, TYPE_DECL
, tname
, type
);
4014 DECL_ARTIFICIAL (tdecl
) = 1;
4015 set_global_binding (tdecl
);
4019 if ((int) rid_index
< (int) RID_MAX
)
4020 if (tree rname
= ridpointers
[(int) rid_index
])
4021 if (!decl
|| DECL_NAME (decl
) != rname
)
4023 tree rdecl
= build_decl (BUILTINS_LOCATION
, TYPE_DECL
, rname
, type
);
4024 DECL_ARTIFICIAL (rdecl
) = 1;
4025 set_global_binding (rdecl
);
4032 if (!TYPE_NAME (type
))
4033 TYPE_NAME (type
) = decl
;
4034 debug_hooks
->type_decl (decl
, 0);
4038 /* Push a type into the namespace so that the back ends ignore it. */
4041 record_unknown_type (tree type
, const char* name
)
4043 tree decl
= pushdecl (build_decl (UNKNOWN_LOCATION
,
4044 TYPE_DECL
, get_identifier (name
), type
));
4045 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
4046 DECL_IGNORED_P (decl
) = 1;
4047 TYPE_DECL_SUPPRESS_DEBUG (decl
) = 1;
4048 TYPE_SIZE (type
) = TYPE_SIZE (void_type_node
);
4049 SET_TYPE_ALIGN (type
, 1);
4050 TYPE_USER_ALIGN (type
) = 0;
4051 SET_TYPE_MODE (type
, TYPE_MODE (void_type_node
));
4054 /* Create all the predefined identifiers. */
4057 initialize_predefined_identifiers (void)
4059 struct predefined_identifier
4061 const char *name
; /* Name. */
4062 tree
*node
; /* Node to store it in. */
4063 cp_identifier_kind kind
; /* Kind of identifier. */
4066 /* A table of identifiers to create at startup. */
4067 static const predefined_identifier predefined_identifiers
[] = {
4068 {"C++", &lang_name_cplusplus
, cik_normal
},
4069 {"C", &lang_name_c
, cik_normal
},
4070 /* Some of these names have a trailing space so that it is
4071 impossible for them to conflict with names written by users. */
4072 {"__ct ", &ctor_identifier
, cik_ctor
},
4073 {"__ct_base ", &base_ctor_identifier
, cik_ctor
},
4074 {"__ct_comp ", &complete_ctor_identifier
, cik_ctor
},
4075 {"__dt ", &dtor_identifier
, cik_dtor
},
4076 {"__dt_base ", &base_dtor_identifier
, cik_dtor
},
4077 {"__dt_comp ", &complete_dtor_identifier
, cik_dtor
},
4078 {"__dt_del ", &deleting_dtor_identifier
, cik_dtor
},
4079 {"__conv_op ", &conv_op_identifier
, cik_conv_op
},
4080 {"__in_chrg", &in_charge_identifier
, cik_normal
},
4081 {"this", &this_identifier
, cik_normal
},
4082 {"__delta", &delta_identifier
, cik_normal
},
4083 {"__pfn", &pfn_identifier
, cik_normal
},
4084 {"_vptr", &vptr_identifier
, cik_normal
},
4085 {"__vtt_parm", &vtt_parm_identifier
, cik_normal
},
4086 {"::", &global_identifier
, cik_normal
},
4087 {"std", &std_identifier
, cik_normal
},
4088 /* The demangler expects anonymous namespaces to be called
4089 something starting with '_GLOBAL__N_'. It no longer needs
4090 to be unique to the TU. */
4091 {"_GLOBAL__N_1", &anon_identifier
, cik_normal
},
4092 {"auto", &auto_identifier
, cik_normal
},
4093 {"decltype(auto)", &decltype_auto_identifier
, cik_normal
},
4094 {"initializer_list", &init_list_identifier
, cik_normal
},
4095 {"__for_range ", &for_range__identifier
, cik_normal
},
4096 {"__for_begin ", &for_begin__identifier
, cik_normal
},
4097 {"__for_end ", &for_end__identifier
, cik_normal
},
4098 {"__for_range", &for_range_identifier
, cik_normal
},
4099 {"__for_begin", &for_begin_identifier
, cik_normal
},
4100 {"__for_end", &for_end_identifier
, cik_normal
},
4101 {"abi_tag", &abi_tag_identifier
, cik_normal
},
4102 {"aligned", &aligned_identifier
, cik_normal
},
4103 {"begin", &begin_identifier
, cik_normal
},
4104 {"end", &end_identifier
, cik_normal
},
4105 {"get", &get__identifier
, cik_normal
},
4106 {"gnu", &gnu_identifier
, cik_normal
},
4107 {"tuple_element", &tuple_element_identifier
, cik_normal
},
4108 {"tuple_size", &tuple_size_identifier
, cik_normal
},
4109 {"type", &type_identifier
, cik_normal
},
4110 {"value", &value_identifier
, cik_normal
},
4111 {"_FUN", &fun_identifier
, cik_normal
},
4112 {"__closure", &closure_identifier
, cik_normal
},
4113 {NULL
, NULL
, cik_normal
}
4116 for (const predefined_identifier
*pid
= predefined_identifiers
;
4119 *pid
->node
= get_identifier (pid
->name
);
4120 /* Some of these identifiers already have a special kind. */
4121 if (pid
->kind
!= cik_normal
)
4122 set_identifier_kind (*pid
->node
, pid
->kind
);
4126 /* Create the predefined scalar types of C,
4127 and some nodes representing standard constants (0, 1, (void *)0).
4128 Initialize the global binding level.
4129 Make definitions for built-in primitive functions. */
4132 cxx_init_decl_processing (void)
4135 tree void_ftype_ptr
;
4137 /* Create all the identifiers we need. */
4138 initialize_predefined_identifiers ();
4140 /* Create the global variables. */
4141 push_to_top_level ();
4143 current_function_decl
= NULL_TREE
;
4144 current_binding_level
= NULL
;
4145 /* Enter the global namespace. */
4146 gcc_assert (global_namespace
== NULL_TREE
);
4147 global_namespace
= build_lang_decl (NAMESPACE_DECL
, global_identifier
,
4149 TREE_PUBLIC (global_namespace
) = 1;
4150 DECL_CONTEXT (global_namespace
)
4151 = build_translation_unit_decl (get_identifier (main_input_filename
));
4152 /* Remember whether we want the empty class passing ABI change warning
4154 TRANSLATION_UNIT_WARN_EMPTY_P (DECL_CONTEXT (global_namespace
))
4155 = warn_abi
&& abi_version_crosses (12);
4156 debug_hooks
->register_main_translation_unit
4157 (DECL_CONTEXT (global_namespace
));
4158 begin_scope (sk_namespace
, global_namespace
);
4159 current_namespace
= global_namespace
;
4161 if (flag_visibility_ms_compat
)
4162 default_visibility
= VISIBILITY_HIDDEN
;
4165 current_lang_name
= lang_name_c
;
4167 /* Create the `std' namespace. */
4168 push_namespace (std_identifier
);
4169 std_node
= current_namespace
;
4172 flag_noexcept_type
= (cxx_dialect
>= cxx17
);
4174 c_common_nodes_and_builtins ();
4176 tree bool_ftype
= build_function_type_list (boolean_type_node
, NULL_TREE
);
4178 = add_builtin_function ("__builtin_is_constant_evaluated",
4179 bool_ftype
, CP_BUILT_IN_IS_CONSTANT_EVALUATED
,
4180 BUILT_IN_FRONTEND
, NULL
, NULL_TREE
);
4181 set_call_expr_flags (decl
, ECF_CONST
| ECF_NOTHROW
| ECF_LEAF
);
4183 integer_two_node
= build_int_cst (NULL_TREE
, 2);
4185 /* Guess at the initial static decls size. */
4186 vec_alloc (static_decls
, 500);
4188 /* ... and keyed classes. */
4189 vec_alloc (keyed_classes
, 100);
4191 record_builtin_type (RID_BOOL
, "bool", boolean_type_node
);
4192 truthvalue_type_node
= boolean_type_node
;
4193 truthvalue_false_node
= boolean_false_node
;
4194 truthvalue_true_node
= boolean_true_node
;
4196 empty_except_spec
= build_tree_list (NULL_TREE
, NULL_TREE
);
4197 noexcept_true_spec
= build_tree_list (boolean_true_node
, NULL_TREE
);
4198 noexcept_false_spec
= build_tree_list (boolean_false_node
, NULL_TREE
);
4199 noexcept_deferred_spec
= build_tree_list (make_node (DEFERRED_NOEXCEPT
),
4203 record_builtin_type (RID_MAX
, NULL
, string_type_node
);
4206 delta_type_node
= ptrdiff_type_node
;
4207 vtable_index_type
= ptrdiff_type_node
;
4209 vtt_parm_type
= build_pointer_type (const_ptr_type_node
);
4210 void_ftype
= build_function_type_list (void_type_node
, NULL_TREE
);
4211 void_ftype_ptr
= build_function_type_list (void_type_node
,
4212 ptr_type_node
, NULL_TREE
);
4214 = build_exception_variant (void_ftype_ptr
, empty_except_spec
);
4216 /* Create the conversion operator marker. This operator's DECL_NAME
4217 is in the identifier table, so we can use identifier equality to
4219 conv_op_marker
= build_lang_decl (FUNCTION_DECL
, conv_op_identifier
,
4222 /* C++ extensions */
4224 unknown_type_node
= make_node (LANG_TYPE
);
4225 record_unknown_type (unknown_type_node
, "unknown type");
4227 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
4228 TREE_TYPE (unknown_type_node
) = unknown_type_node
;
4230 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
4232 TYPE_POINTER_TO (unknown_type_node
) = unknown_type_node
;
4233 TYPE_REFERENCE_TO (unknown_type_node
) = unknown_type_node
;
4235 init_list_type_node
= make_node (LANG_TYPE
);
4236 record_unknown_type (init_list_type_node
, "init list");
4239 /* Make sure we get a unique function type, so we can give
4240 its pointer type a name. (This wins for gdb.) */
4241 tree vfunc_type
= make_node (FUNCTION_TYPE
);
4242 TREE_TYPE (vfunc_type
) = integer_type_node
;
4243 TYPE_ARG_TYPES (vfunc_type
) = NULL_TREE
;
4244 layout_type (vfunc_type
);
4246 vtable_entry_type
= build_pointer_type (vfunc_type
);
4248 record_builtin_type (RID_MAX
, "__vtbl_ptr_type", vtable_entry_type
);
4251 = build_cplus_array_type (vtable_entry_type
, NULL_TREE
);
4252 layout_type (vtbl_type_node
);
4253 vtbl_type_node
= cp_build_qualified_type (vtbl_type_node
, TYPE_QUAL_CONST
);
4254 record_builtin_type (RID_MAX
, NULL
, vtbl_type_node
);
4255 vtbl_ptr_type_node
= build_pointer_type (vtable_entry_type
);
4256 layout_type (vtbl_ptr_type_node
);
4257 record_builtin_type (RID_MAX
, NULL
, vtbl_ptr_type_node
);
4259 push_namespace (get_identifier ("__cxxabiv1"));
4260 abi_node
= current_namespace
;
4263 global_type_node
= make_node (LANG_TYPE
);
4264 record_unknown_type (global_type_node
, "global type");
4266 any_targ_node
= make_node (LANG_TYPE
);
4267 record_unknown_type (any_targ_node
, "any type");
4270 current_lang_name
= lang_name_cplusplus
;
4272 if (aligned_new_threshold
> 1
4273 && !pow2p_hwi (aligned_new_threshold
))
4275 error ("-faligned-new=%d is not a power of two", aligned_new_threshold
);
4276 aligned_new_threshold
= 1;
4278 if (aligned_new_threshold
== -1)
4279 aligned_new_threshold
= (cxx_dialect
>= cxx17
) ? 1 : 0;
4280 if (aligned_new_threshold
== 1)
4281 aligned_new_threshold
= malloc_alignment () / BITS_PER_UNIT
;
4284 tree newattrs
, extvisattr
;
4285 tree newtype
, deltype
;
4286 tree ptr_ftype_sizetype
;
4290 = build_function_type_list (ptr_type_node
, size_type_node
, NULL_TREE
);
4291 if (cxx_dialect
== cxx98
)
4294 tree bad_alloc_type_node
;
4295 tree bad_alloc_decl
;
4297 push_namespace (std_identifier
);
4298 bad_alloc_id
= get_identifier ("bad_alloc");
4299 bad_alloc_type_node
= make_class_type (RECORD_TYPE
);
4300 TYPE_CONTEXT (bad_alloc_type_node
) = current_namespace
;
4302 = create_implicit_typedef (bad_alloc_id
, bad_alloc_type_node
);
4303 DECL_CONTEXT (bad_alloc_decl
) = current_namespace
;
4307 = add_exception_specifier (NULL_TREE
, bad_alloc_type_node
, -1);
4310 new_eh_spec
= noexcept_false_spec
;
4312 /* Ensure attribs.c is initialized. */
4315 /* Ensure constraint.cc is initialized. */
4316 init_constraint_processing ();
4318 extvisattr
= build_tree_list (get_identifier ("externally_visible"),
4320 newattrs
= tree_cons (get_identifier ("alloc_size"),
4321 build_tree_list (NULL_TREE
, integer_one_node
),
4323 newtype
= cp_build_type_attribute_variant (ptr_ftype_sizetype
, newattrs
);
4324 newtype
= build_exception_variant (newtype
, new_eh_spec
);
4325 deltype
= cp_build_type_attribute_variant (void_ftype_ptr
, extvisattr
);
4326 deltype
= build_exception_variant (deltype
, empty_except_spec
);
4327 tree opnew
= push_cp_library_fn (NEW_EXPR
, newtype
, 0);
4328 DECL_IS_MALLOC (opnew
) = 1;
4329 DECL_IS_OPERATOR_NEW (opnew
) = 1;
4330 opnew
= push_cp_library_fn (VEC_NEW_EXPR
, newtype
, 0);
4331 DECL_IS_MALLOC (opnew
) = 1;
4332 DECL_IS_OPERATOR_NEW (opnew
) = 1;
4333 push_cp_library_fn (DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4334 push_cp_library_fn (VEC_DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4335 if (flag_sized_deallocation
)
4337 /* Also push the sized deallocation variants:
4338 void operator delete(void*, std::size_t) throw();
4339 void operator delete[](void*, std::size_t) throw(); */
4340 tree void_ftype_ptr_size
4341 = build_function_type_list (void_type_node
, ptr_type_node
,
4342 size_type_node
, NULL_TREE
);
4343 deltype
= cp_build_type_attribute_variant (void_ftype_ptr_size
,
4345 deltype
= build_exception_variant (deltype
, empty_except_spec
);
4346 push_cp_library_fn (DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4347 push_cp_library_fn (VEC_DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4350 if (aligned_new_threshold
)
4352 push_namespace (std_identifier
);
4353 tree align_id
= get_identifier ("align_val_t");
4354 align_type_node
= start_enum (align_id
, NULL_TREE
, size_type_node
,
4355 NULL_TREE
, /*scoped*/true, NULL
);
4358 /* operator new (size_t, align_val_t); */
4359 newtype
= build_function_type_list (ptr_type_node
, size_type_node
,
4360 align_type_node
, NULL_TREE
);
4361 newtype
= cp_build_type_attribute_variant (newtype
, newattrs
);
4362 newtype
= build_exception_variant (newtype
, new_eh_spec
);
4363 opnew
= push_cp_library_fn (NEW_EXPR
, newtype
, 0);
4364 DECL_IS_MALLOC (opnew
) = 1;
4365 DECL_IS_OPERATOR_NEW (opnew
) = 1;
4366 opnew
= push_cp_library_fn (VEC_NEW_EXPR
, newtype
, 0);
4367 DECL_IS_MALLOC (opnew
) = 1;
4368 DECL_IS_OPERATOR_NEW (opnew
) = 1;
4370 /* operator delete (void *, align_val_t); */
4371 deltype
= build_function_type_list (void_type_node
, ptr_type_node
,
4372 align_type_node
, NULL_TREE
);
4373 deltype
= cp_build_type_attribute_variant (deltype
, extvisattr
);
4374 deltype
= build_exception_variant (deltype
, empty_except_spec
);
4375 push_cp_library_fn (DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4376 push_cp_library_fn (VEC_DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4378 if (flag_sized_deallocation
)
4380 /* operator delete (void *, size_t, align_val_t); */
4381 deltype
= build_function_type_list (void_type_node
, ptr_type_node
,
4382 size_type_node
, align_type_node
,
4384 deltype
= cp_build_type_attribute_variant (deltype
, extvisattr
);
4385 deltype
= build_exception_variant (deltype
, empty_except_spec
);
4386 push_cp_library_fn (DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4387 push_cp_library_fn (VEC_DELETE_EXPR
, deltype
, ECF_NOTHROW
);
4391 nullptr_type_node
= make_node (NULLPTR_TYPE
);
4392 TYPE_SIZE (nullptr_type_node
) = bitsize_int (GET_MODE_BITSIZE (ptr_mode
));
4393 TYPE_SIZE_UNIT (nullptr_type_node
) = size_int (GET_MODE_SIZE (ptr_mode
));
4394 TYPE_UNSIGNED (nullptr_type_node
) = 1;
4395 TYPE_PRECISION (nullptr_type_node
) = GET_MODE_BITSIZE (ptr_mode
);
4396 if (abi_version_at_least (9))
4397 SET_TYPE_ALIGN (nullptr_type_node
, GET_MODE_ALIGNMENT (ptr_mode
));
4398 SET_TYPE_MODE (nullptr_type_node
, ptr_mode
);
4399 record_builtin_type (RID_MAX
, "decltype(nullptr)", nullptr_type_node
);
4400 nullptr_node
= build_int_cst (nullptr_type_node
, 0);
4404 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype
,
4405 ECF_NORETURN
| ECF_NOTHROW
| ECF_COLD
);
4407 /* Perform other language dependent initializations. */
4408 init_class_processing ();
4409 init_rtti_processing ();
4410 init_template_processing ();
4412 if (flag_exceptions
)
4413 init_exception_processing ();
4415 if (! supports_one_only ())
4418 make_fname_decl
= cp_make_fname_decl
;
4419 start_fname_decls ();
4421 /* Show we use EH for cleanups. */
4422 if (flag_exceptions
)
4423 using_eh_for_cleanups ();
4426 /* Generate an initializer for a function naming variable from
4427 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
4428 filled in with the type of the init. */
4431 cp_fname_init (const char* name
, tree
*type_p
)
4433 tree domain
= NULL_TREE
;
4435 tree init
= NULL_TREE
;
4440 length
= strlen (name
);
4441 domain
= build_index_type (size_int (length
));
4442 init
= build_string (length
+ 1, name
);
4445 type
= cp_build_qualified_type (char_type_node
, TYPE_QUAL_CONST
);
4446 type
= build_cplus_array_type (type
, domain
);
4451 TREE_TYPE (init
) = type
;
4453 init
= error_mark_node
;
4458 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
4459 the decl, LOC is the location to give the decl, NAME is the
4460 initialization string and TYPE_DEP indicates whether NAME depended
4461 on the type of the function. We make use of that to detect
4462 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
4463 at the point of first use, so we mustn't push the decl now. */
4466 cp_make_fname_decl (location_t loc
, tree id
, int type_dep
)
4468 const char *const name
= (type_dep
&& processing_template_decl
4469 ? NULL
: fname_as_string (type_dep
));
4471 tree init
= cp_fname_init (name
, &type
);
4472 tree decl
= build_decl (loc
, VAR_DECL
, id
, type
);
4475 free (CONST_CAST (char *, name
));
4477 TREE_STATIC (decl
) = 1;
4478 TREE_READONLY (decl
) = 1;
4479 DECL_ARTIFICIAL (decl
) = 1;
4481 TREE_USED (decl
) = 1;
4483 if (current_function_decl
)
4485 DECL_CONTEXT (decl
) = current_function_decl
;
4486 decl
= pushdecl_outermost_localscope (decl
);
4487 cp_finish_decl (decl
, init
, /*init_const_expr_p=*/false, NULL_TREE
,
4488 LOOKUP_ONLYCONVERTING
);
4492 DECL_THIS_STATIC (decl
) = true;
4493 pushdecl_top_level_and_finish (decl
, init
);
4500 builtin_function_1 (tree decl
, tree context
, bool is_global
)
4502 tree id
= DECL_NAME (decl
);
4503 const char *name
= IDENTIFIER_POINTER (id
);
4505 retrofit_lang_decl (decl
);
4507 DECL_ARTIFICIAL (decl
) = 1;
4508 SET_DECL_LANGUAGE (decl
, lang_c
);
4509 /* Runtime library routines are, by definition, available in an
4510 external shared object. */
4511 DECL_VISIBILITY (decl
) = VISIBILITY_DEFAULT
;
4512 DECL_VISIBILITY_SPECIFIED (decl
) = 1;
4514 DECL_CONTEXT (decl
) = context
;
4516 /* A function in the user's namespace should have an explicit
4517 declaration before it is used. Mark the built-in function as
4518 anticipated but not actually declared. */
4519 if (name
[0] != '_' || name
[1] != '_')
4520 DECL_ANTICIPATED (decl
) = 1;
4521 else if (strncmp (name
+ 2, "builtin_", strlen ("builtin_")) != 0)
4523 size_t len
= strlen (name
);
4525 /* Treat __*_chk fortification functions as anticipated as well,
4526 unless they are __builtin_*. */
4527 if (len
> strlen ("___chk")
4528 && memcmp (name
+ len
- strlen ("_chk"),
4529 "_chk", strlen ("_chk") + 1) == 0)
4530 DECL_ANTICIPATED (decl
) = 1;
4534 pushdecl_top_level (decl
);
4542 cxx_builtin_function (tree decl
)
4544 tree id
= DECL_NAME (decl
);
4545 const char *name
= IDENTIFIER_POINTER (id
);
4546 /* All builtins that don't begin with an '_' should additionally
4547 go in the 'std' namespace. */
4550 tree decl2
= copy_node(decl
);
4551 push_namespace (std_identifier
);
4552 builtin_function_1 (decl2
, std_node
, false);
4556 return builtin_function_1 (decl
, NULL_TREE
, false);
4559 /* Like cxx_builtin_function, but guarantee the function is added to the global
4560 scope. This is to allow function specific options to add new machine
4561 dependent builtins when the target ISA changes via attribute((target(...)))
4562 which saves space on program startup if the program does not use non-generic
4566 cxx_builtin_function_ext_scope (tree decl
)
4569 tree id
= DECL_NAME (decl
);
4570 const char *name
= IDENTIFIER_POINTER (id
);
4571 /* All builtins that don't begin with an '_' should additionally
4572 go in the 'std' namespace. */
4575 tree decl2
= copy_node(decl
);
4576 push_namespace (std_identifier
);
4577 builtin_function_1 (decl2
, std_node
, true);
4581 return builtin_function_1 (decl
, NULL_TREE
, true);
4584 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
4585 function. Not called directly. */
4588 build_library_fn (tree name
, enum tree_code operator_code
, tree type
,
4591 tree fn
= build_lang_decl (FUNCTION_DECL
, name
, type
);
4592 DECL_EXTERNAL (fn
) = 1;
4593 TREE_PUBLIC (fn
) = 1;
4594 DECL_ARTIFICIAL (fn
) = 1;
4595 DECL_OVERLOADED_OPERATOR_CODE_RAW (fn
)
4596 = OVL_OP_INFO (false, operator_code
)->ovl_op_code
;
4597 SET_DECL_LANGUAGE (fn
, lang_c
);
4598 /* Runtime library routines are, by definition, available in an
4599 external shared object. */
4600 DECL_VISIBILITY (fn
) = VISIBILITY_DEFAULT
;
4601 DECL_VISIBILITY_SPECIFIED (fn
) = 1;
4602 set_call_expr_flags (fn
, ecf_flags
);
4606 /* Returns the _DECL for a library function with C++ linkage. */
4609 build_cp_library_fn (tree name
, enum tree_code operator_code
, tree type
,
4612 tree fn
= build_library_fn (name
, operator_code
, type
, ecf_flags
);
4613 DECL_CONTEXT (fn
) = FROB_CONTEXT (current_namespace
);
4614 SET_DECL_LANGUAGE (fn
, lang_cplusplus
);
4618 /* Like build_library_fn, but takes a C string instead of an
4622 build_library_fn_ptr (const char* name
, tree type
, int ecf_flags
)
4624 return build_library_fn (get_identifier (name
), ERROR_MARK
, type
, ecf_flags
);
4627 /* Like build_cp_library_fn, but takes a C string instead of an
4631 build_cp_library_fn_ptr (const char* name
, tree type
, int ecf_flags
)
4633 return build_cp_library_fn (get_identifier (name
), ERROR_MARK
, type
,
4637 /* Like build_library_fn, but also pushes the function so that we will
4638 be able to find it via get_global_binding. Also, the function
4639 may throw exceptions listed in RAISES. */
4642 push_library_fn (tree name
, tree type
, tree raises
, int ecf_flags
)
4647 type
= build_exception_variant (type
, raises
);
4649 fn
= build_library_fn (name
, ERROR_MARK
, type
, ecf_flags
);
4650 pushdecl_top_level (fn
);
4654 /* Like build_cp_library_fn, but also pushes the function so that it
4655 will be found by normal lookup. */
4658 push_cp_library_fn (enum tree_code operator_code
, tree type
,
4661 tree fn
= build_cp_library_fn (ovl_op_identifier (false, operator_code
),
4662 operator_code
, type
, ecf_flags
);
4665 apply_tm_attr (fn
, get_identifier ("transaction_safe"));
4669 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
4673 push_void_library_fn (tree name
, tree parmtypes
, int ecf_flags
)
4675 tree type
= build_function_type (void_type_node
, parmtypes
);
4676 return push_library_fn (name
, type
, NULL_TREE
, ecf_flags
);
4679 /* Like push_library_fn, but also note that this function throws
4680 and does not return. Used for __throw_foo and the like. */
4683 push_throw_library_fn (tree name
, tree type
)
4685 tree fn
= push_library_fn (name
, type
, NULL_TREE
, ECF_NORETURN
| ECF_COLD
);
4689 /* When we call finish_struct for an anonymous union, we create
4690 default copy constructors and such. But, an anonymous union
4691 shouldn't have such things; this function undoes the damage to the
4692 anonymous union type T.
4694 (The reason that we create the synthesized methods is that we don't
4695 distinguish `union { int i; }' from `typedef union { int i; } U'.
4696 The first is an anonymous union; the second is just an ordinary
4700 fixup_anonymous_aggr (tree t
)
4702 /* Wipe out memory of synthesized methods. */
4703 TYPE_HAS_USER_CONSTRUCTOR (t
) = 0;
4704 TYPE_HAS_DEFAULT_CONSTRUCTOR (t
) = 0;
4705 TYPE_HAS_COPY_CTOR (t
) = 0;
4706 TYPE_HAS_CONST_COPY_CTOR (t
) = 0;
4707 TYPE_HAS_COPY_ASSIGN (t
) = 0;
4708 TYPE_HAS_CONST_COPY_ASSIGN (t
) = 0;
4710 /* Splice the implicitly generated functions out of TYPE_FIELDS. */
4711 for (tree probe
, *prev_p
= &TYPE_FIELDS (t
); (probe
= *prev_p
);)
4712 if (TREE_CODE (probe
) == FUNCTION_DECL
&& DECL_ARTIFICIAL (probe
))
4713 *prev_p
= DECL_CHAIN (probe
);
4715 prev_p
= &DECL_CHAIN (probe
);
4717 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
4718 assignment operators (because they cannot have these methods themselves).
4719 For anonymous unions this is already checked because they are not allowed
4720 in any union, otherwise we have to check it. */
4721 if (TREE_CODE (t
) != UNION_TYPE
)
4725 for (field
= TYPE_FIELDS (t
); field
; field
= DECL_CHAIN (field
))
4726 if (TREE_CODE (field
) == FIELD_DECL
)
4728 type
= TREE_TYPE (field
);
4729 if (CLASS_TYPE_P (type
))
4731 if (TYPE_NEEDS_CONSTRUCTING (type
))
4732 error ("member %q+#D with constructor not allowed "
4733 "in anonymous aggregate", field
);
4734 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
))
4735 error ("member %q+#D with destructor not allowed "
4736 "in anonymous aggregate", field
);
4737 if (TYPE_HAS_COMPLEX_COPY_ASSIGN (type
))
4738 error ("member %q+#D with copy assignment operator "
4739 "not allowed in anonymous aggregate", field
);
4745 /* Warn for an attribute located at LOCATION that appertains to the
4746 class type CLASS_TYPE that has not been properly placed after its
4747 class-key, in it class-specifier. */
4750 warn_misplaced_attr_for_class_type (source_location location
,
4753 gcc_assert (OVERLOAD_TYPE_P (class_type
));
4755 auto_diagnostic_group d
;
4756 if (warning_at (location
, OPT_Wattributes
,
4757 "attribute ignored in declaration "
4758 "of %q#T", class_type
))
4760 "attribute for %q#T must follow the %qs keyword",
4761 class_type
, class_key_or_enum_as_string (class_type
));
4764 /* Make sure that a declaration with no declarator is well-formed, i.e.
4765 just declares a tagged type or anonymous union.
4767 Returns the type declared; or NULL_TREE if none. */
4770 check_tag_decl (cp_decl_specifier_seq
*declspecs
,
4771 bool explicit_type_instantiation_p
)
4773 int saw_friend
= decl_spec_seq_has_spec_p (declspecs
, ds_friend
);
4774 int saw_typedef
= decl_spec_seq_has_spec_p (declspecs
, ds_typedef
);
4775 /* If a class, struct, or enum type is declared by the DECLSPECS
4776 (i.e, if a class-specifier, enum-specifier, or non-typename
4777 elaborated-type-specifier appears in the DECLSPECS),
4778 DECLARED_TYPE is set to the corresponding type. */
4779 tree declared_type
= NULL_TREE
;
4780 bool error_p
= false;
4782 if (declspecs
->multiple_types_p
)
4783 error ("multiple types in one declaration");
4784 else if (declspecs
->redefined_builtin_type
)
4786 if (!in_system_header_at (input_location
))
4787 permerror (declspecs
->locations
[ds_redefined_builtin_type_spec
],
4788 "redeclaration of C++ built-in type %qT",
4789 declspecs
->redefined_builtin_type
);
4794 && TYPE_P (declspecs
->type
)
4795 && ((TREE_CODE (declspecs
->type
) != TYPENAME_TYPE
4796 && MAYBE_CLASS_TYPE_P (declspecs
->type
))
4797 || TREE_CODE (declspecs
->type
) == ENUMERAL_TYPE
))
4798 declared_type
= declspecs
->type
;
4799 else if (declspecs
->type
== error_mark_node
)
4801 if (declared_type
== NULL_TREE
&& ! saw_friend
&& !error_p
)
4802 permerror (input_location
, "declaration does not declare anything");
4803 else if (declared_type
!= NULL_TREE
&& type_uses_auto (declared_type
))
4805 error_at (declspecs
->locations
[ds_type_spec
],
4806 "%<auto%> can only be specified for variables "
4807 "or function declarations");
4808 return error_mark_node
;
4810 /* Check for an anonymous union. */
4811 else if (declared_type
&& RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type
))
4812 && TYPE_UNNAMED_P (declared_type
))
4814 /* 7/3 In a simple-declaration, the optional init-declarator-list
4815 can be omitted only when declaring a class (clause 9) or
4816 enumeration (7.2), that is, when the decl-specifier-seq contains
4817 either a class-specifier, an elaborated-type-specifier with
4818 a class-key (9.1), or an enum-specifier. In these cases and
4819 whenever a class-specifier or enum-specifier is present in the
4820 decl-specifier-seq, the identifiers in these specifiers are among
4821 the names being declared by the declaration (as class-name,
4822 enum-names, or enumerators, depending on the syntax). In such
4823 cases, and except for the declaration of an unnamed bit-field (9.6),
4824 the decl-specifier-seq shall introduce one or more names into the
4825 program, or shall redeclare a name introduced by a previous
4826 declaration. [Example:
4827 enum { }; // ill-formed
4828 typedef class { }; // ill-formed
4832 error ("missing type-name in typedef-declaration");
4835 /* Anonymous unions are objects, so they can have specifiers. */;
4836 SET_ANON_AGGR_TYPE_P (declared_type
);
4838 if (TREE_CODE (declared_type
) != UNION_TYPE
4839 && !in_system_header_at (input_location
))
4840 pedwarn (input_location
, OPT_Wpedantic
, "ISO C++ prohibits anonymous structs");
4845 if (decl_spec_seq_has_spec_p (declspecs
, ds_inline
))
4846 error_at (declspecs
->locations
[ds_inline
],
4847 "%<inline%> can only be specified for functions");
4848 else if (decl_spec_seq_has_spec_p (declspecs
, ds_virtual
))
4849 error_at (declspecs
->locations
[ds_virtual
],
4850 "%<virtual%> can only be specified for functions");
4852 && (!current_class_type
4853 || current_scope () != current_class_type
))
4854 error_at (declspecs
->locations
[ds_friend
],
4855 "%<friend%> can only be specified inside a class");
4856 else if (decl_spec_seq_has_spec_p (declspecs
, ds_explicit
))
4857 error_at (declspecs
->locations
[ds_explicit
],
4858 "%<explicit%> can only be specified for constructors");
4859 else if (declspecs
->storage_class
)
4860 error_at (declspecs
->locations
[ds_storage_class
],
4861 "a storage class can only be specified for objects "
4863 else if (decl_spec_seq_has_spec_p (declspecs
, ds_const
))
4864 error_at (declspecs
->locations
[ds_const
],
4865 "%<const%> can only be specified for objects and "
4867 else if (decl_spec_seq_has_spec_p (declspecs
, ds_volatile
))
4868 error_at (declspecs
->locations
[ds_volatile
],
4869 "%<volatile%> can only be specified for objects and "
4871 else if (decl_spec_seq_has_spec_p (declspecs
, ds_restrict
))
4872 error_at (declspecs
->locations
[ds_restrict
],
4873 "%<__restrict%> can only be specified for objects and "
4875 else if (decl_spec_seq_has_spec_p (declspecs
, ds_thread
))
4876 error_at (declspecs
->locations
[ds_thread
],
4877 "%<__thread%> can only be specified for objects "
4879 else if (saw_typedef
)
4880 warning_at (declspecs
->locations
[ds_typedef
], 0,
4881 "%<typedef%> was ignored in this declaration");
4882 else if (decl_spec_seq_has_spec_p (declspecs
, ds_constexpr
))
4883 error_at (declspecs
->locations
[ds_constexpr
],
4884 "%<constexpr%> cannot be used for type declarations");
4887 if (declspecs
->attributes
&& warn_attributes
&& declared_type
)
4890 if (!CLASS_TYPE_P (declared_type
)
4891 || !CLASSTYPE_TEMPLATE_INSTANTIATION (declared_type
))
4892 /* For a non-template class, use the name location. */
4893 loc
= location_of (declared_type
);
4895 /* For a template class (an explicit instantiation), use the
4896 current location. */
4897 loc
= input_location
;
4899 if (explicit_type_instantiation_p
)
4900 /* [dcl.attr.grammar]/4:
4902 No attribute-specifier-seq shall appertain to an explicit
4905 if (warning_at (loc
, OPT_Wattributes
,
4906 "attribute ignored in explicit instantiation %q#T",
4909 "no attribute can be applied to "
4910 "an explicit instantiation");
4913 warn_misplaced_attr_for_class_type (loc
, declared_type
);
4916 return declared_type
;
4919 /* Called when a declaration is seen that contains no names to declare.
4920 If its type is a reference to a structure, union or enum inherited
4921 from a containing scope, shadow that tag name for the current scope
4922 with a forward reference.
4923 If its type defines a new named structure or union
4924 or defines an enum, it is valid but we need not do anything here.
4925 Otherwise, it is an error.
4927 C++: may have to grok the declspecs to learn about static,
4928 complain for anonymous unions.
4930 Returns the TYPE declared -- or NULL_TREE if none. */
4933 shadow_tag (cp_decl_specifier_seq
*declspecs
)
4935 tree t
= check_tag_decl (declspecs
,
4936 /*explicit_type_instantiation_p=*/false);
4941 if (maybe_process_partial_specialization (t
) == error_mark_node
)
4944 /* This is where the variables in an anonymous union are
4945 declared. An anonymous union declaration looks like:
4947 because there is no declarator after the union, the parser
4948 sends that declaration here. */
4949 if (ANON_AGGR_TYPE_P (t
))
4951 fixup_anonymous_aggr (t
);
4953 if (TYPE_FIELDS (t
))
4955 tree decl
= grokdeclarator (/*declarator=*/NULL
,
4956 declspecs
, NORMAL
, 0, NULL
);
4957 finish_anon_union (decl
);
4964 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4967 groktypename (cp_decl_specifier_seq
*type_specifiers
,
4968 const cp_declarator
*declarator
,
4969 bool is_template_arg
)
4973 enum decl_context context
4974 = is_template_arg
? TEMPLATE_TYPE_ARG
: TYPENAME
;
4975 attrs
= type_specifiers
->attributes
;
4976 type_specifiers
->attributes
= NULL_TREE
;
4977 type
= grokdeclarator (declarator
, type_specifiers
, context
, 0, &attrs
);
4978 if (attrs
&& type
!= error_mark_node
)
4980 if (CLASS_TYPE_P (type
))
4981 warning (OPT_Wattributes
, "ignoring attributes applied to class type %qT "
4982 "outside of definition", type
);
4983 else if (MAYBE_CLASS_TYPE_P (type
))
4984 /* A template type parameter or other dependent type. */
4985 warning (OPT_Wattributes
, "ignoring attributes applied to dependent "
4986 "type %qT without an associated declaration", type
);
4988 cplus_decl_attributes (&type
, attrs
, 0);
4993 /* Process a DECLARATOR for a function-scope variable declaration,
4994 namespace-scope variable declaration, or function declaration.
4995 (Function definitions go through start_function; class member
4996 declarations appearing in the body of the class go through
4997 grokfield.) The DECL corresponding to the DECLARATOR is returned.
4998 If an error occurs, the error_mark_node is returned instead.
5000 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
5001 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
5002 for an explicitly defaulted function, or SD_DELETED for an explicitly
5003 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
5004 implicitly initialized via a default constructor. ATTRIBUTES and
5005 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
5007 The scope represented by the context of the returned DECL is pushed
5008 (if it is not the global namespace) and is assigned to
5009 *PUSHED_SCOPE_P. The caller is then responsible for calling
5010 pop_scope on *PUSHED_SCOPE_P if it is set. */
5013 start_decl (const cp_declarator
*declarator
,
5014 cp_decl_specifier_seq
*declspecs
,
5017 tree prefix_attributes
,
5018 tree
*pushed_scope_p
)
5026 *pushed_scope_p
= NULL_TREE
;
5028 /* An object declared as __attribute__((deprecated)) suppresses
5029 warnings of uses of other deprecated items. */
5030 if (lookup_attribute ("deprecated", attributes
))
5031 deprecated_state
= DEPRECATED_SUPPRESS
;
5033 attributes
= chainon (attributes
, prefix_attributes
);
5035 decl
= grokdeclarator (declarator
, declspecs
, NORMAL
, initialized
,
5038 deprecated_state
= DEPRECATED_NORMAL
;
5040 if (decl
== NULL_TREE
|| VOID_TYPE_P (decl
)
5041 || decl
== error_mark_node
)
5042 return error_mark_node
;
5044 context
= CP_DECL_CONTEXT (decl
);
5045 if (context
!= global_namespace
)
5046 *pushed_scope_p
= push_scope (context
);
5048 /* Is it valid for this decl to have an initializer at all?
5049 If not, set INITIALIZED to zero, which will indirectly
5050 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
5052 && TREE_CODE (decl
) == TYPE_DECL
)
5054 error ("typedef %qD is initialized (use decltype instead)", decl
);
5055 return error_mark_node
;
5060 if (! toplevel_bindings_p ()
5061 && DECL_EXTERNAL (decl
))
5062 warning (0, "declaration of %q#D has %<extern%> and is initialized",
5064 DECL_EXTERNAL (decl
) = 0;
5065 if (toplevel_bindings_p ())
5066 TREE_STATIC (decl
) = 1;
5068 alias
= lookup_attribute ("alias", DECL_ATTRIBUTES (decl
)) != 0;
5070 if (alias
&& TREE_CODE (decl
) == FUNCTION_DECL
)
5071 record_key_method_defined (decl
);
5073 /* If this is a typedef that names the class for linkage purposes
5074 (7.1.3p8), apply any attributes directly to the type. */
5075 if (TREE_CODE (decl
) == TYPE_DECL
5076 && OVERLOAD_TYPE_P (TREE_TYPE (decl
))
5077 && decl
== TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl
))))
5078 flags
= ATTR_FLAG_TYPE_IN_PLACE
;
5082 /* Set attributes here so if duplicate decl, will have proper attributes. */
5083 cplus_decl_attributes (&decl
, attributes
, flags
);
5085 /* Dllimported symbols cannot be defined. Static data members (which
5086 can be initialized in-class and dllimported) go through grokfield,
5087 not here, so we don't need to exclude those decls when checking for
5089 if (initialized
&& DECL_DLLIMPORT_P (decl
))
5091 error ("definition of %q#D is marked %<dllimport%>", decl
);
5092 DECL_DLLIMPORT_P (decl
) = 0;
5095 /* If #pragma weak was used, mark the decl weak now. */
5096 if (!processing_template_decl
&& !DECL_DECOMPOSITION_P (decl
))
5097 maybe_apply_pragma_weak (decl
);
5099 if (TREE_CODE (decl
) == FUNCTION_DECL
5100 && DECL_DECLARED_INLINE_P (decl
)
5101 && DECL_UNINLINABLE (decl
)
5102 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl
)))
5103 warning_at (DECL_SOURCE_LOCATION (decl
), 0,
5104 "inline function %qD given attribute noinline", decl
);
5106 if (TYPE_P (context
) && COMPLETE_TYPE_P (complete_type (context
)))
5108 bool this_tmpl
= (processing_template_decl
5109 > template_class_depth (context
));
5112 tree field
= lookup_field (context
, DECL_NAME (decl
), 0, false);
5113 if (field
== NULL_TREE
5114 || !(VAR_P (field
) || variable_template_p (field
)))
5115 error ("%q+#D is not a static data member of %q#T", decl
, context
);
5116 else if (variable_template_p (field
)
5117 && (DECL_LANG_SPECIFIC (decl
)
5118 && DECL_TEMPLATE_SPECIALIZATION (decl
)))
5119 /* OK, specialization was already checked. */;
5120 else if (variable_template_p (field
) && !this_tmpl
)
5122 error_at (DECL_SOURCE_LOCATION (decl
),
5123 "non-member-template declaration of %qD", decl
);
5124 inform (DECL_SOURCE_LOCATION (field
), "does not match "
5125 "member template declaration here");
5126 return error_mark_node
;
5130 if (variable_template_p (field
))
5131 field
= DECL_TEMPLATE_RESULT (field
);
5133 if (DECL_CONTEXT (field
) != context
)
5135 if (!same_type_p (DECL_CONTEXT (field
), context
))
5136 permerror (input_location
, "ISO C++ does not permit %<%T::%D%> "
5137 "to be defined as %<%T::%D%>",
5138 DECL_CONTEXT (field
), DECL_NAME (decl
),
5139 context
, DECL_NAME (decl
));
5140 DECL_CONTEXT (decl
) = DECL_CONTEXT (field
);
5142 /* Static data member are tricky; an in-class initialization
5143 still doesn't provide a definition, so the in-class
5144 declaration will have DECL_EXTERNAL set, but will have an
5145 initialization. Thus, duplicate_decls won't warn
5146 about this situation, and so we check here. */
5147 if (initialized
&& DECL_INITIALIZED_IN_CLASS_P (field
))
5148 error ("duplicate initialization of %qD", decl
);
5149 field
= duplicate_decls (decl
, field
,
5150 /*newdecl_is_friend=*/false);
5151 if (field
== error_mark_node
)
5152 return error_mark_node
;
5159 tree field
= check_classfn (context
, decl
,
5161 ? current_template_parms
5163 if (field
&& field
!= error_mark_node
5164 && duplicate_decls (decl
, field
,
5165 /*newdecl_is_friend=*/false))
5169 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
5170 DECL_IN_AGGR_P (decl
) = 0;
5171 /* Do not mark DECL as an explicit specialization if it was not
5172 already marked as an instantiation; a declaration should
5173 never be marked as a specialization unless we know what
5174 template is being specialized. */
5175 if (DECL_LANG_SPECIFIC (decl
) && DECL_USE_TEMPLATE (decl
))
5177 SET_DECL_TEMPLATE_SPECIALIZATION (decl
);
5178 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5179 DECL_COMDAT (decl
) = (TREE_PUBLIC (decl
)
5180 && DECL_DECLARED_INLINE_P (decl
));
5182 DECL_COMDAT (decl
) = false;
5184 /* [temp.expl.spec] An explicit specialization of a static data
5185 member of a template is a definition if the declaration
5186 includes an initializer; otherwise, it is a declaration.
5188 We check for processing_specialization so this only applies
5189 to the new specialization syntax. */
5190 if (!initialized
&& processing_specialization
)
5191 DECL_EXTERNAL (decl
) = 1;
5194 if (DECL_EXTERNAL (decl
) && ! DECL_TEMPLATE_SPECIALIZATION (decl
)
5195 /* Aliases are definitions. */
5197 permerror (input_location
, "declaration of %q#D outside of class is not definition",
5201 was_public
= TREE_PUBLIC (decl
);
5203 /* Enter this declaration into the symbol table. Don't push the plain
5204 VAR_DECL for a variable template. */
5205 if (!template_parm_scope_p ()
5207 decl
= maybe_push_decl (decl
);
5209 if (processing_template_decl
)
5210 decl
= push_template_decl (decl
);
5211 if (decl
== error_mark_node
)
5212 return error_mark_node
;
5215 && DECL_NAMESPACE_SCOPE_P (decl
) && !TREE_PUBLIC (decl
) && !was_public
5216 && !DECL_THIS_STATIC (decl
) && !DECL_ARTIFICIAL (decl
))
5218 /* This is a const variable with implicit 'static'. Set
5219 DECL_THIS_STATIC so we can tell it from variables that are
5220 !TREE_PUBLIC because of the anonymous namespace. */
5221 gcc_assert (CP_TYPE_CONST_P (TREE_TYPE (decl
)) || errorcount
);
5222 DECL_THIS_STATIC (decl
) = 1;
5225 if (current_function_decl
&& VAR_P (decl
)
5226 && DECL_DECLARED_CONSTEXPR_P (current_function_decl
))
5229 if (CP_DECL_THREAD_LOCAL_P (decl
))
5230 error ("%qD declared %<thread_local%> in %<constexpr%> function",
5232 else if (TREE_STATIC (decl
))
5233 error ("%qD declared %<static%> in %<constexpr%> function", decl
);
5237 cp_function_chain
->invalid_constexpr
= true;
5240 if (!processing_template_decl
&& VAR_P (decl
))
5241 start_decl_1 (decl
, initialized
);
5246 /* Process the declaration of a variable DECL. INITIALIZED is true
5247 iff DECL is explicitly initialized. (INITIALIZED is false if the
5248 variable is initialized via an implicitly-called constructor.)
5249 This function must be called for ordinary variables (including, for
5250 example, implicit instantiations of templates), but must not be
5251 called for template declarations. */
5254 start_decl_1 (tree decl
, bool initialized
)
5258 bool aggregate_definition_p
;
5260 gcc_assert (!processing_template_decl
);
5262 if (error_operand_p (decl
))
5265 gcc_assert (VAR_P (decl
));
5267 type
= TREE_TYPE (decl
);
5268 complete_p
= COMPLETE_TYPE_P (type
);
5269 aggregate_definition_p
= MAYBE_CLASS_TYPE_P (type
) && !DECL_EXTERNAL (decl
);
5271 /* If an explicit initializer is present, or if this is a definition
5272 of an aggregate, then we need a complete type at this point.
5273 (Scalars are always complete types, so there is nothing to
5274 check.) This code just sets COMPLETE_P; errors (if necessary)
5275 are issued below. */
5276 if ((initialized
|| aggregate_definition_p
)
5278 && COMPLETE_TYPE_P (complete_type (type
)))
5281 /* We will not yet have set TREE_READONLY on DECL if the type
5282 was "const", but incomplete, before this point. But, now, we
5283 have a complete type, so we can try again. */
5284 cp_apply_type_quals_to_decl (cp_type_quals (type
), decl
);
5288 /* Is it valid for this decl to have an initializer at all? */
5290 /* Don't allow initializations for incomplete types except for
5291 arrays which might be completed by the initialization. */
5293 ; /* A complete type is ok. */
5294 else if (type_uses_auto (type
))
5295 ; /* An auto type is ok. */
5296 else if (TREE_CODE (type
) != ARRAY_TYPE
)
5298 error ("variable %q#D has initializer but incomplete type", decl
);
5299 type
= TREE_TYPE (decl
) = error_mark_node
;
5301 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type
))))
5303 if (DECL_LANG_SPECIFIC (decl
) && DECL_TEMPLATE_INFO (decl
))
5304 error ("elements of array %q#D have incomplete type", decl
);
5305 /* else we already gave an error in start_decl. */
5308 else if (aggregate_definition_p
&& !complete_p
)
5310 if (type_uses_auto (type
))
5311 gcc_assert (CLASS_PLACEHOLDER_TEMPLATE (type
));
5314 error ("aggregate %q#D has incomplete type and cannot be defined",
5316 /* Change the type so that assemble_variable will give
5317 DECL an rtl we can live with: (mem (const_int 0)). */
5318 type
= TREE_TYPE (decl
) = error_mark_node
;
5322 /* Create a new scope to hold this declaration if necessary.
5323 Whether or not a new scope is necessary cannot be determined
5324 until after the type has been completed; if the type is a
5325 specialization of a class template it is not until after
5326 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
5327 will be set correctly. */
5328 maybe_push_cleanup_level (type
);
5331 /* Handle initialization of references. DECL, TYPE, and INIT have the
5332 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
5333 but will be set to a new CLEANUP_STMT if a temporary is created
5334 that must be destroyed subsequently.
5336 Returns an initializer expression to use to initialize DECL, or
5337 NULL if the initialization can be performed statically.
5339 Quotes on semantics can be found in ARM 8.4.3. */
5342 grok_reference_init (tree decl
, tree type
, tree init
, int flags
)
5344 if (init
== NULL_TREE
)
5346 if ((DECL_LANG_SPECIFIC (decl
) == 0
5347 || DECL_IN_AGGR_P (decl
) == 0)
5348 && ! DECL_THIS_EXTERN (decl
))
5349 error ("%qD declared as reference but not initialized", decl
);
5353 if (TREE_CODE (init
) == TREE_LIST
)
5354 init
= build_x_compound_expr_from_list (init
, ELK_INIT
,
5355 tf_warning_or_error
);
5357 tree ttype
= TREE_TYPE (type
);
5358 if (TREE_CODE (ttype
) != ARRAY_TYPE
5359 && TREE_CODE (TREE_TYPE (init
)) == ARRAY_TYPE
)
5360 /* Note: default conversion is only called in very special cases. */
5361 init
= decay_conversion (init
, tf_warning_or_error
);
5363 /* check_initializer handles this for non-reference variables, but for
5364 references we need to do it here or the initializer will get the
5365 incomplete array type and confuse later calls to
5366 cp_complete_array_type. */
5367 if (TREE_CODE (ttype
) == ARRAY_TYPE
5368 && TYPE_DOMAIN (ttype
) == NULL_TREE
5369 && (BRACE_ENCLOSED_INITIALIZER_P (init
)
5370 || TREE_CODE (init
) == STRING_CST
))
5372 cp_complete_array_type (&ttype
, init
, false);
5373 if (ttype
!= TREE_TYPE (type
))
5374 type
= cp_build_reference_type (ttype
, TYPE_REF_IS_RVALUE (type
));
5377 /* Convert INIT to the reference type TYPE. This may involve the
5378 creation of a temporary, whose lifetime must be the same as that
5379 of the reference. If so, a DECL_EXPR for the temporary will be
5380 added just after the DECL_EXPR for DECL. That's why we don't set
5381 DECL_INITIAL for local references (instead assigning to them
5382 explicitly); we need to allow the temporary to be initialized
5384 return initialize_reference (type
, init
, flags
,
5385 tf_warning_or_error
);
5388 /* Designated initializers in arrays are not supported in GNU C++.
5389 The parser cannot detect this error since it does not know whether
5390 a given brace-enclosed initializer is for a class type or for an
5391 array. This function checks that CE does not use a designated
5392 initializer. If it does, an error is issued. Returns true if CE
5393 is valid, i.e., does not have a designated initializer. */
5396 check_array_designated_initializer (constructor_elt
*ce
,
5397 unsigned HOST_WIDE_INT index
)
5399 /* Designated initializers for array elements are not supported. */
5402 /* The parser only allows identifiers as designated
5404 if (ce
->index
== error_mark_node
)
5406 error ("name used in a GNU-style designated "
5407 "initializer for an array");
5410 else if (identifier_p (ce
->index
))
5412 error ("name %qD used in a GNU-style designated "
5413 "initializer for an array", ce
->index
);
5417 tree ce_index
= build_expr_type_conversion (WANT_INT
| WANT_ENUM
,
5420 && INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (ce_index
))
5421 && (TREE_CODE (ce_index
= fold_non_dependent_expr (ce_index
))
5424 /* A C99 designator is OK if it matches the current index. */
5425 if (wi::to_wide (ce_index
) == index
)
5427 ce
->index
= ce_index
;
5431 sorry ("non-trivial designated initializers not supported");
5434 error ("C99 designator %qE is not an integral constant-expression",
5443 /* When parsing `int a[] = {1, 2};' we don't know the size of the
5444 array until we finish parsing the initializer. If that's the
5445 situation we're in, update DECL accordingly. */
5448 maybe_deduce_size_from_array_init (tree decl
, tree init
)
5450 tree type
= TREE_TYPE (decl
);
5452 if (TREE_CODE (type
) == ARRAY_TYPE
5453 && TYPE_DOMAIN (type
) == NULL_TREE
5454 && TREE_CODE (decl
) != TYPE_DECL
)
5456 /* do_default is really a C-ism to deal with tentative definitions.
5457 But let's leave it here to ease the eventual merge. */
5458 int do_default
= !DECL_EXTERNAL (decl
);
5459 tree initializer
= init
? init
: DECL_INITIAL (decl
);
5462 /* Check that there are no designated initializers in INIT, as
5463 those are not supported in GNU C++, and as the middle-end
5464 will crash if presented with a non-numeric designated
5466 if (initializer
&& BRACE_ENCLOSED_INITIALIZER_P (initializer
))
5468 vec
<constructor_elt
, va_gc
> *v
= CONSTRUCTOR_ELTS (initializer
);
5469 constructor_elt
*ce
;
5471 FOR_EACH_VEC_SAFE_ELT (v
, i
, ce
)
5473 if (instantiation_dependent_expression_p (ce
->index
))
5475 if (!check_array_designated_initializer (ce
, i
))
5481 TREE_TYPE (decl
) = error_mark_node
;
5484 failure
= cp_complete_array_type (&TREE_TYPE (decl
), initializer
,
5488 error_at (cp_expr_loc_or_loc (initializer
,
5489 DECL_SOURCE_LOCATION (decl
)),
5490 "initializer fails to determine size of %qD", decl
);
5492 else if (failure
== 2)
5496 error_at (DECL_SOURCE_LOCATION (decl
),
5497 "array size missing in %qD", decl
);
5499 /* If a `static' var's size isn't known, make it extern as
5500 well as static, so it does not get allocated. If it's not
5501 `static', then don't mark it extern; finish_incomplete_decl
5502 will give it a default size and it will get allocated. */
5503 else if (!pedantic
&& TREE_STATIC (decl
) && !TREE_PUBLIC (decl
))
5504 DECL_EXTERNAL (decl
) = 1;
5506 else if (failure
== 3)
5508 error_at (DECL_SOURCE_LOCATION (decl
),
5509 "zero-size array %qD", decl
);
5513 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl
)), decl
);
5515 relayout_decl (decl
);
5519 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
5520 any appropriate error messages regarding the layout. */
5523 layout_var_decl (tree decl
)
5527 type
= TREE_TYPE (decl
);
5528 if (type
== error_mark_node
)
5531 /* If we haven't already laid out this declaration, do so now.
5532 Note that we must not call complete type for an external object
5533 because it's type might involve templates that we are not
5534 supposed to instantiate yet. (And it's perfectly valid to say
5535 `extern X x' for some incomplete type `X'.) */
5536 if (!DECL_EXTERNAL (decl
))
5537 complete_type (type
);
5538 if (!DECL_SIZE (decl
)
5539 && TREE_TYPE (decl
) != error_mark_node
5540 && complete_or_array_type_p (type
))
5541 layout_decl (decl
, 0);
5543 if (!DECL_EXTERNAL (decl
) && DECL_SIZE (decl
) == NULL_TREE
)
5545 /* An automatic variable with an incomplete type: that is an error.
5546 Don't talk about array types here, since we took care of that
5547 message in grokdeclarator. */
5548 error_at (DECL_SOURCE_LOCATION (decl
),
5549 "storage size of %qD isn%'t known", decl
);
5550 TREE_TYPE (decl
) = error_mark_node
;
5553 /* Keep this code around in case we later want to control debug info
5554 based on whether a type is "used". (jason 1999-11-11) */
5556 else if (!DECL_EXTERNAL (decl
) && MAYBE_CLASS_TYPE_P (ttype
))
5557 /* Let debugger know it should output info for this type. */
5558 note_debug_info_needed (ttype
);
5560 if (TREE_STATIC (decl
) && DECL_CLASS_SCOPE_P (decl
))
5561 note_debug_info_needed (DECL_CONTEXT (decl
));
5564 if ((DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
5565 && DECL_SIZE (decl
) != NULL_TREE
5566 && ! TREE_CONSTANT (DECL_SIZE (decl
)))
5568 if (TREE_CODE (DECL_SIZE (decl
)) == INTEGER_CST
)
5569 constant_expression_warning (DECL_SIZE (decl
));
5572 error_at (DECL_SOURCE_LOCATION (decl
),
5573 "storage size of %qD isn%'t constant", decl
);
5574 TREE_TYPE (decl
) = error_mark_node
;
5579 /* If a local static variable is declared in an inline function, or if
5580 we have a weak definition, we must endeavor to create only one
5581 instance of the variable at link-time. */
5584 maybe_commonize_var (tree decl
)
5586 /* Static data in a function with comdat linkage also has comdat
5588 if ((TREE_STATIC (decl
)
5589 /* Don't mess with __FUNCTION__. */
5590 && ! DECL_ARTIFICIAL (decl
)
5591 && DECL_FUNCTION_SCOPE_P (decl
)
5592 && vague_linkage_p (DECL_CONTEXT (decl
)))
5593 || (TREE_PUBLIC (decl
) && DECL_INLINE_VAR_P (decl
)))
5597 /* With weak symbols, we simply make the variable COMDAT;
5598 that will cause copies in multiple translations units to
5600 comdat_linkage (decl
);
5604 if (DECL_INITIAL (decl
) == NULL_TREE
5605 || DECL_INITIAL (decl
) == error_mark_node
)
5607 /* Without weak symbols, we can use COMMON to merge
5608 uninitialized variables. */
5609 TREE_PUBLIC (decl
) = 1;
5610 DECL_COMMON (decl
) = 1;
5614 /* While for initialized variables, we must use internal
5615 linkage -- which means that multiple copies will not
5617 TREE_PUBLIC (decl
) = 0;
5618 DECL_COMMON (decl
) = 0;
5620 if (DECL_INLINE_VAR_P (decl
))
5621 msg
= G_("sorry: semantics of inline variable "
5622 "%q#D are wrong (you%'ll wind up with "
5623 "multiple copies)");
5625 msg
= G_("sorry: semantics of inline function "
5626 "static data %q#D are wrong (you%'ll wind "
5627 "up with multiple copies)");
5628 if (warning_at (DECL_SOURCE_LOCATION (decl
), 0,
5630 inform (DECL_SOURCE_LOCATION (decl
),
5631 "you can work around this by removing the initializer");
5637 /* Issue an error message if DECL is an uninitialized const variable.
5638 CONSTEXPR_CONTEXT_P is true when the function is called in a constexpr
5639 context from potential_constant_expression. Returns true if all is well,
5643 check_for_uninitialized_const_var (tree decl
, bool constexpr_context_p
,
5644 tsubst_flags_t complain
)
5646 tree type
= strip_array_types (TREE_TYPE (decl
));
5648 /* ``Unless explicitly declared extern, a const object does not have
5649 external linkage and must be initialized. ($8.4; $12.1)'' ARM
5652 && !TYPE_REF_P (type
)
5653 && (constexpr_context_p
5654 || CP_TYPE_CONST_P (type
) || var_in_constexpr_fn (decl
))
5655 && !DECL_NONTRIVIALLY_INITIALIZED_P (decl
))
5657 tree field
= default_init_uninitialized_part (type
);
5661 if (!constexpr_context_p
)
5663 if (CP_TYPE_CONST_P (type
))
5665 if (complain
& tf_error
)
5666 permerror (DECL_SOURCE_LOCATION (decl
),
5667 "uninitialized const %qD", decl
);
5671 if (!is_instantiation_of_constexpr (current_function_decl
)
5672 && (complain
& tf_error
))
5673 error_at (DECL_SOURCE_LOCATION (decl
),
5674 "uninitialized variable %qD in %<constexpr%> "
5676 cp_function_chain
->invalid_constexpr
= true;
5679 else if (complain
& tf_error
)
5680 error_at (DECL_SOURCE_LOCATION (decl
),
5681 "uninitialized variable %qD in %<constexpr%> context",
5684 if (CLASS_TYPE_P (type
) && (complain
& tf_error
))
5686 tree defaulted_ctor
;
5688 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (type
)),
5689 "%q#T has no user-provided default constructor", type
);
5690 defaulted_ctor
= in_class_defaulted_default_constructor (type
);
5692 inform (DECL_SOURCE_LOCATION (defaulted_ctor
),
5693 "constructor is not user-provided because it is "
5694 "explicitly defaulted in the class body");
5695 inform (DECL_SOURCE_LOCATION (field
),
5696 "and the implicitly-defined constructor does not "
5697 "initialize %q#D", field
);
5706 /* Structure holding the current initializer being processed by reshape_init.
5707 CUR is a pointer to the current element being processed, END is a pointer
5708 after the last element present in the initializer. */
5711 constructor_elt
*cur
;
5712 constructor_elt
*end
;
5715 static tree
reshape_init_r (tree
, reshape_iter
*, bool, tsubst_flags_t
);
5717 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
5718 returned is the next FIELD_DECL (possibly FIELD itself) that can be
5719 initialized. If there are no more such fields, the return value
5723 next_initializable_field (tree field
)
5726 && (TREE_CODE (field
) != FIELD_DECL
5727 || DECL_UNNAMED_BIT_FIELD (field
)
5728 || (DECL_ARTIFICIAL (field
)
5729 && !(cxx_dialect
>= cxx17
&& DECL_FIELD_IS_BASE (field
)))))
5730 field
= DECL_CHAIN (field
);
5735 /* Return true for [dcl.init.list] direct-list-initialization from
5736 single element of enumeration with a fixed underlying type. */
5739 is_direct_enum_init (tree type
, tree init
)
5741 if (cxx_dialect
>= cxx17
5742 && TREE_CODE (type
) == ENUMERAL_TYPE
5743 && ENUM_FIXED_UNDERLYING_TYPE_P (type
)
5744 && TREE_CODE (init
) == CONSTRUCTOR
5745 && CONSTRUCTOR_IS_DIRECT_INIT (init
)
5746 && CONSTRUCTOR_NELTS (init
) == 1)
5751 /* Subroutine of reshape_init_array and reshape_init_vector, which does
5752 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
5753 INTEGER_CST representing the size of the array minus one (the maximum index),
5754 or NULL_TREE if the array was declared without specifying the size. D is
5755 the iterator within the constructor. */
5758 reshape_init_array_1 (tree elt_type
, tree max_index
, reshape_iter
*d
,
5759 tsubst_flags_t complain
)
5762 bool sized_array_p
= (max_index
&& TREE_CONSTANT (max_index
));
5763 unsigned HOST_WIDE_INT max_index_cst
= 0;
5764 unsigned HOST_WIDE_INT index
;
5766 /* The initializer for an array is always a CONSTRUCTOR. */
5767 new_init
= build_constructor (init_list_type_node
, NULL
);
5771 /* Minus 1 is used for zero sized arrays. */
5772 if (integer_all_onesp (max_index
))
5775 if (tree_fits_uhwi_p (max_index
))
5776 max_index_cst
= tree_to_uhwi (max_index
);
5777 /* sizetype is sign extended, not zero extended. */
5779 max_index_cst
= tree_to_uhwi (fold_convert (size_type_node
, max_index
));
5782 /* Loop until there are no more initializers. */
5784 d
->cur
!= d
->end
&& (!sized_array_p
|| index
<= max_index_cst
);
5788 constructor_elt
*old_cur
= d
->cur
;
5790 check_array_designated_initializer (d
->cur
, index
);
5791 elt_init
= reshape_init_r (elt_type
, d
, /*first_initializer_p=*/false,
5793 if (elt_init
== error_mark_node
)
5794 return error_mark_node
;
5795 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init
),
5796 size_int (index
), elt_init
);
5797 if (!TREE_CONSTANT (elt_init
))
5798 TREE_CONSTANT (new_init
) = false;
5800 /* This can happen with an invalid initializer (c++/54501). */
5801 if (d
->cur
== old_cur
&& !sized_array_p
)
5808 /* Subroutine of reshape_init_r, processes the initializers for arrays.
5809 Parameters are the same of reshape_init_r. */
5812 reshape_init_array (tree type
, reshape_iter
*d
, tsubst_flags_t complain
)
5814 tree max_index
= NULL_TREE
;
5816 gcc_assert (TREE_CODE (type
) == ARRAY_TYPE
);
5818 if (TYPE_DOMAIN (type
))
5819 max_index
= array_type_nelts (type
);
5821 return reshape_init_array_1 (TREE_TYPE (type
), max_index
, d
, complain
);
5824 /* Subroutine of reshape_init_r, processes the initializers for vectors.
5825 Parameters are the same of reshape_init_r. */
5828 reshape_init_vector (tree type
, reshape_iter
*d
, tsubst_flags_t complain
)
5830 tree max_index
= NULL_TREE
;
5832 gcc_assert (VECTOR_TYPE_P (type
));
5834 if (COMPOUND_LITERAL_P (d
->cur
->value
))
5836 tree value
= d
->cur
->value
;
5837 if (!same_type_p (TREE_TYPE (value
), type
))
5839 if (complain
& tf_error
)
5840 error ("invalid type %qT as initializer for a vector of type %qT",
5841 TREE_TYPE (d
->cur
->value
), type
);
5842 value
= error_mark_node
;
5848 /* For a vector, we initialize it as an array of the appropriate size. */
5849 if (VECTOR_TYPE_P (type
))
5850 max_index
= size_int (TYPE_VECTOR_SUBPARTS (type
) - 1);
5852 return reshape_init_array_1 (TREE_TYPE (type
), max_index
, d
, complain
);
5855 /* Subroutine of reshape_init_r, processes the initializers for classes
5856 or union. Parameters are the same of reshape_init_r. */
5859 reshape_init_class (tree type
, reshape_iter
*d
, bool first_initializer_p
,
5860 tsubst_flags_t complain
)
5865 gcc_assert (CLASS_TYPE_P (type
));
5867 /* The initializer for a class is always a CONSTRUCTOR. */
5868 new_init
= build_constructor (init_list_type_node
, NULL
);
5869 field
= next_initializable_field (TYPE_FIELDS (type
));
5875 An initializer for an aggregate member that is an
5876 empty class shall have the form of an empty
5877 initializer-list {}. */
5878 if (!first_initializer_p
)
5880 if (complain
& tf_error
)
5881 error ("initializer for %qT must be brace-enclosed", type
);
5882 return error_mark_node
;
5887 /* Loop through the initializable fields, gathering initializers. */
5888 while (d
->cur
!= d
->end
)
5891 constructor_elt
*old_cur
= d
->cur
;
5893 /* Handle designated initializers, as an extension. */
5896 if (d
->cur
->index
== error_mark_node
)
5897 return error_mark_node
;
5899 if (TREE_CODE (d
->cur
->index
) == FIELD_DECL
)
5901 /* We already reshaped this. */
5902 if (field
!= d
->cur
->index
)
5904 tree id
= DECL_NAME (d
->cur
->index
);
5906 gcc_checking_assert (d
->cur
->index
5907 == get_class_binding (type
, id
, false));
5908 field
= d
->cur
->index
;
5911 else if (TREE_CODE (d
->cur
->index
) == IDENTIFIER_NODE
)
5912 field
= get_class_binding (type
, d
->cur
->index
, false);
5915 if (complain
& tf_error
)
5916 error ("%<[%E] =%> used in a GNU-style designated initializer"
5917 " for class %qT", d
->cur
->index
, type
);
5918 return error_mark_node
;
5921 if (!field
|| TREE_CODE (field
) != FIELD_DECL
)
5923 if (complain
& tf_error
)
5924 error ("%qT has no non-static data member named %qD", type
,
5926 return error_mark_node
;
5930 /* If we processed all the member of the class, we are done. */
5934 field_init
= reshape_init_r (TREE_TYPE (field
), d
,
5935 /*first_initializer_p=*/false, complain
);
5936 if (field_init
== error_mark_node
)
5937 return error_mark_node
;
5939 if (d
->cur
== old_cur
&& d
->cur
->index
)
5941 /* This can happen with an invalid initializer for a flexible
5942 array member (c++/54441). */
5943 if (complain
& tf_error
)
5944 error ("invalid initializer for %q#D", field
);
5945 return error_mark_node
;
5948 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init
), field
, field_init
);
5952 When a union is initialized with a brace-enclosed
5953 initializer, the braces shall only contain an
5954 initializer for the first member of the union. */
5955 if (TREE_CODE (type
) == UNION_TYPE
)
5958 field
= next_initializable_field (DECL_CHAIN (field
));
5964 /* Subroutine of reshape_init_r. We're in a context where C99 initializer
5965 designators are not valid; either complain or return true to indicate
5966 that reshape_init_r should return error_mark_node. */
5969 has_designator_problem (reshape_iter
*d
, tsubst_flags_t complain
)
5973 if (complain
& tf_error
)
5974 error ("C99 designator %qE outside aggregate initializer",
5982 /* Subroutine of reshape_init, which processes a single initializer (part of
5983 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
5984 iterator within the CONSTRUCTOR which points to the initializer to process.
5985 FIRST_INITIALIZER_P is true if this is the first initializer of the
5986 outermost CONSTRUCTOR node. */
5989 reshape_init_r (tree type
, reshape_iter
*d
, bool first_initializer_p
,
5990 tsubst_flags_t complain
)
5992 tree init
= d
->cur
->value
;
5994 if (error_operand_p (init
))
5995 return error_mark_node
;
5997 if (first_initializer_p
&& !CP_AGGREGATE_TYPE_P (type
)
5998 && has_designator_problem (d
, complain
))
5999 return error_mark_node
;
6001 if (TREE_CODE (type
) == COMPLEX_TYPE
)
6003 /* A complex type can be initialized from one or two initializers,
6004 but braces are not elided. */
6006 if (BRACE_ENCLOSED_INITIALIZER_P (init
))
6008 if (CONSTRUCTOR_NELTS (init
) > 2)
6010 if (complain
& tf_error
)
6011 error ("too many initializers for %qT", type
);
6013 return error_mark_node
;
6016 else if (first_initializer_p
&& d
->cur
!= d
->end
)
6018 vec
<constructor_elt
, va_gc
> *v
= 0;
6019 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, init
);
6020 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, d
->cur
->value
);
6021 if (has_designator_problem (d
, complain
))
6022 return error_mark_node
;
6024 init
= build_constructor (init_list_type_node
, v
);
6029 /* A non-aggregate type is always initialized with a single
6031 if (!CP_AGGREGATE_TYPE_P (type
))
6033 /* It is invalid to initialize a non-aggregate type with a
6034 brace-enclosed initializer before C++0x.
6035 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
6036 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
6037 a CONSTRUCTOR (with a record type). */
6038 if (TREE_CODE (init
) == CONSTRUCTOR
6039 /* Don't complain about a capture-init. */
6040 && !CONSTRUCTOR_IS_DIRECT_INIT (init
)
6041 && BRACE_ENCLOSED_INITIALIZER_P (init
)) /* p7626.C */
6043 if (SCALAR_TYPE_P (type
))
6045 if (cxx_dialect
< cxx11
6046 /* Isn't value-initialization. */
6047 || CONSTRUCTOR_NELTS (init
) > 0)
6049 if (complain
& tf_error
)
6050 error ("braces around scalar initializer for type %qT",
6052 init
= error_mark_node
;
6056 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS
);
6063 /* "If T is a class type and the initializer list has a single element of
6064 type cv U, where U is T or a class derived from T, the object is
6065 initialized from that element." Even if T is an aggregate. */
6066 if (cxx_dialect
>= cxx11
&& (CLASS_TYPE_P (type
) || VECTOR_TYPE_P (type
))
6067 && first_initializer_p
6068 && d
->end
- d
->cur
== 1
6069 && reference_related_p (type
, TREE_TYPE (init
)))
6077 All implicit type conversions (clause _conv_) are considered when
6078 initializing the aggregate member with an initializer from an
6079 initializer-list. If the initializer can initialize a member,
6080 the member is initialized. Otherwise, if the member is itself a
6081 non-empty subaggregate, brace elision is assumed and the
6082 initializer is considered for the initialization of the first
6083 member of the subaggregate. */
6084 if (TREE_CODE (init
) != CONSTRUCTOR
6085 /* But don't try this for the first initializer, since that would be
6086 looking through the outermost braces; A a2 = { a1 }; is not a
6087 valid aggregate initialization. */
6088 && !first_initializer_p
6089 && (same_type_ignoring_top_level_qualifiers_p (type
, TREE_TYPE (init
))
6090 || can_convert_arg (type
, TREE_TYPE (init
), init
, LOOKUP_NORMAL
,
6097 /* [dcl.init.string]
6099 A char array (whether plain char, signed char, or unsigned char)
6100 can be initialized by a string-literal (optionally enclosed in
6101 braces); a wchar_t array can be initialized by a wide
6102 string-literal (optionally enclosed in braces). */
6103 if (TREE_CODE (type
) == ARRAY_TYPE
6104 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type
))))
6106 tree str_init
= init
;
6108 /* Strip one level of braces if and only if they enclose a single
6109 element (as allowed by [dcl.init.string]). */
6110 if (!first_initializer_p
6111 && TREE_CODE (str_init
) == CONSTRUCTOR
6112 && CONSTRUCTOR_NELTS (str_init
) == 1)
6114 str_init
= (*CONSTRUCTOR_ELTS (str_init
))[0].value
;
6117 /* If it's a string literal, then it's the initializer for the array
6118 as a whole. Otherwise, continue with normal initialization for
6119 array types (one value per array element). */
6120 if (TREE_CODE (str_init
) == STRING_CST
)
6122 if (has_designator_problem (d
, complain
))
6123 return error_mark_node
;
6129 /* The following cases are about aggregates. If we are not within a full
6130 initializer already, and there is not a CONSTRUCTOR, it means that there
6131 is a missing set of braces (that is, we are processing the case for
6132 which reshape_init exists). */
6133 if (!first_initializer_p
)
6135 if (TREE_CODE (init
) == CONSTRUCTOR
)
6137 if (TREE_TYPE (init
) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init
)))
6138 /* There is no need to reshape pointer-to-member function
6139 initializers, as they are always constructed correctly
6140 by the front end. */
6142 else if (COMPOUND_LITERAL_P (init
))
6143 /* For a nested compound literal, there is no need to reshape since
6144 brace elision is not allowed. Even if we decided to allow it,
6145 we should add a call to reshape_init in finish_compound_literal,
6146 before calling digest_init, so changing this code would still
6147 not be necessary. */
6148 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init
));
6152 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init
));
6153 return reshape_init (type
, init
, complain
);
6157 if (complain
& tf_warning
)
6158 warning (OPT_Wmissing_braces
,
6159 "missing braces around initializer for %qT",
6163 /* Dispatch to specialized routines. */
6164 if (CLASS_TYPE_P (type
))
6165 return reshape_init_class (type
, d
, first_initializer_p
, complain
);
6166 else if (TREE_CODE (type
) == ARRAY_TYPE
)
6167 return reshape_init_array (type
, d
, complain
);
6168 else if (VECTOR_TYPE_P (type
))
6169 return reshape_init_vector (type
, d
, complain
);
6174 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
6175 brace-enclosed aggregate initializer.
6177 INIT is the CONSTRUCTOR containing the list of initializers describing
6178 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
6179 It may not presently match the shape of the TYPE; for example:
6181 struct S { int a; int b; };
6182 struct S a[] = { 1, 2, 3, 4 };
6184 Here INIT will hold a vector of four elements, rather than a
6185 vector of two elements, each itself a vector of two elements. This
6186 routine transforms INIT from the former form into the latter. The
6187 revised CONSTRUCTOR node is returned. */
6190 reshape_init (tree type
, tree init
, tsubst_flags_t complain
)
6192 vec
<constructor_elt
, va_gc
> *v
;
6196 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init
));
6198 v
= CONSTRUCTOR_ELTS (init
);
6200 /* An empty constructor does not need reshaping, and it is always a valid
6202 if (vec_safe_is_empty (v
))
6205 /* Handle [dcl.init.list] direct-list-initialization from
6206 single element of enumeration with a fixed underlying type. */
6207 if (is_direct_enum_init (type
, init
))
6209 tree elt
= CONSTRUCTOR_ELT (init
, 0)->value
;
6210 type
= cv_unqualified (type
);
6211 if (check_narrowing (ENUM_UNDERLYING_TYPE (type
), elt
, complain
))
6213 warning_sentinel
w (warn_useless_cast
);
6214 warning_sentinel
w2 (warn_ignored_qualifiers
);
6215 return cp_build_c_cast (type
, elt
, tf_warning_or_error
);
6218 return error_mark_node
;
6221 /* Recurse on this CONSTRUCTOR. */
6223 d
.end
= d
.cur
+ v
->length ();
6225 new_init
= reshape_init_r (type
, &d
, true, complain
);
6226 if (new_init
== error_mark_node
)
6227 return error_mark_node
;
6229 /* Make sure all the element of the constructor were used. Otherwise,
6230 issue an error about exceeding initializers. */
6233 if (complain
& tf_error
)
6234 error ("too many initializers for %qT", type
);
6235 return error_mark_node
;
6238 if (CONSTRUCTOR_IS_DIRECT_INIT (init
)
6239 && BRACE_ENCLOSED_INITIALIZER_P (new_init
))
6240 CONSTRUCTOR_IS_DIRECT_INIT (new_init
) = true;
6245 /* Verify array initializer. Returns true if errors have been reported. */
6248 check_array_initializer (tree decl
, tree type
, tree init
)
6250 tree element_type
= TREE_TYPE (type
);
6252 /* The array type itself need not be complete, because the
6253 initializer may tell us how many elements are in the array.
6254 But, the elements of the array must be complete. */
6255 if (!COMPLETE_TYPE_P (complete_type (element_type
)))
6258 error_at (DECL_SOURCE_LOCATION (decl
),
6259 "elements of array %q#D have incomplete type", decl
);
6261 error ("elements of array %q#T have incomplete type", type
);
6264 /* A compound literal can't have variable size. */
6266 && ((COMPLETE_TYPE_P (type
) && !TREE_CONSTANT (TYPE_SIZE (type
)))
6267 || !TREE_CONSTANT (TYPE_SIZE (element_type
))))
6269 error ("variable-sized compound literal");
6275 /* Subroutine of check_initializer; args are passed down from that function.
6276 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
6279 build_aggr_init_full_exprs (tree decl
, tree init
, int flags
)
6282 gcc_assert (stmts_are_full_exprs_p ());
6283 return build_aggr_init (decl
, init
, flags
, tf_warning_or_error
);
6286 /* Verify INIT (the initializer for DECL), and record the
6287 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
6288 grok_reference_init.
6290 If the return value is non-NULL, it is an expression that must be
6291 evaluated dynamically to initialize DECL. */
6294 check_initializer (tree decl
, tree init
, int flags
, vec
<tree
, va_gc
> **cleanups
)
6296 tree type
= TREE_TYPE (decl
);
6297 tree init_code
= NULL
;
6300 /* Things that are going to be initialized need to have complete
6302 TREE_TYPE (decl
) = type
= complete_type (TREE_TYPE (decl
));
6304 if (DECL_HAS_VALUE_EXPR_P (decl
))
6306 /* A variable with DECL_HAS_VALUE_EXPR_P set is just a placeholder,
6307 it doesn't have storage to be initialized. */
6308 gcc_assert (init
== NULL_TREE
);
6312 if (type
== error_mark_node
)
6313 /* We will have already complained. */
6316 if (TREE_CODE (type
) == ARRAY_TYPE
)
6318 if (check_array_initializer (decl
, type
, init
))
6321 else if (!COMPLETE_TYPE_P (type
))
6323 error_at (DECL_SOURCE_LOCATION (decl
),
6324 "%q#D has incomplete type", decl
);
6325 TREE_TYPE (decl
) = error_mark_node
;
6329 /* There is no way to make a variable-sized class type in GNU C++. */
6330 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type
)));
6332 if (init
&& BRACE_ENCLOSED_INITIALIZER_P (init
))
6334 int init_len
= CONSTRUCTOR_NELTS (init
);
6335 if (SCALAR_TYPE_P (type
))
6339 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS
);
6340 init
= build_zero_init (type
, NULL_TREE
, false);
6342 else if (init_len
!= 1 && TREE_CODE (type
) != COMPLEX_TYPE
)
6344 error_at (cp_expr_loc_or_loc (init
, DECL_SOURCE_LOCATION (decl
)),
6345 "scalar object %qD requires one element in "
6346 "initializer", decl
);
6347 TREE_TYPE (decl
) = error_mark_node
;
6353 if (TREE_CODE (decl
) == CONST_DECL
)
6355 gcc_assert (!TYPE_REF_P (type
));
6357 DECL_INITIAL (decl
) = init
;
6359 gcc_assert (init
!= NULL_TREE
);
6362 else if (!init
&& DECL_REALLY_EXTERN (decl
))
6364 else if (init
|| type_build_ctor_call (type
)
6365 || TYPE_REF_P (type
))
6367 if (TYPE_REF_P (type
))
6369 init
= grok_reference_init (decl
, type
, init
, flags
);
6370 flags
|= LOOKUP_ALREADY_DIGESTED
;
6373 check_for_uninitialized_const_var (decl
, /*constexpr_context_p=*/false,
6374 tf_warning_or_error
);
6375 /* Do not reshape constructors of vectors (they don't need to be
6377 else if (BRACE_ENCLOSED_INITIALIZER_P (init
))
6379 if (is_std_init_list (type
))
6381 init
= perform_implicit_conversion (type
, init
,
6382 tf_warning_or_error
);
6383 flags
|= LOOKUP_ALREADY_DIGESTED
;
6385 else if (TYPE_NON_AGGREGATE_CLASS (type
))
6387 /* Don't reshape if the class has constructors. */
6388 if (cxx_dialect
== cxx98
)
6389 error_at (cp_expr_loc_or_loc (init
, DECL_SOURCE_LOCATION (decl
)),
6390 "in C++98 %qD must be initialized by "
6391 "constructor, not by %<{...}%>",
6394 else if (VECTOR_TYPE_P (type
) && TYPE_VECTOR_OPAQUE (type
))
6396 error ("opaque vector types cannot be initialized");
6397 init
= error_mark_node
;
6401 init
= reshape_init (type
, init
, tf_warning_or_error
);
6402 flags
|= LOOKUP_NO_NARROWING
;
6405 else if (TREE_CODE (init
) == TREE_LIST
6406 && TREE_TYPE (init
) != unknown_type_node
6407 && !MAYBE_CLASS_TYPE_P (type
))
6409 gcc_assert (TREE_CODE (decl
) != RESULT_DECL
);
6411 /* We get here with code like `int a (2);' */
6412 init
= build_x_compound_expr_from_list (init
, ELK_INIT
,
6413 tf_warning_or_error
);
6416 /* If DECL has an array type without a specific bound, deduce the
6417 array size from the initializer. */
6418 maybe_deduce_size_from_array_init (decl
, init
);
6419 type
= TREE_TYPE (decl
);
6420 if (type
== error_mark_node
)
6423 if (((type_build_ctor_call (type
) || CLASS_TYPE_P (type
))
6424 && !(flags
& LOOKUP_ALREADY_DIGESTED
)
6425 && !(init
&& BRACE_ENCLOSED_INITIALIZER_P (init
)
6426 && CP_AGGREGATE_TYPE_P (type
)
6427 && (CLASS_TYPE_P (type
)
6428 || !TYPE_NEEDS_CONSTRUCTING (type
)
6429 || type_has_extended_temps (type
))))
6430 || (DECL_DECOMPOSITION_P (decl
) && TREE_CODE (type
) == ARRAY_TYPE
))
6432 init_code
= build_aggr_init_full_exprs (decl
, init
, flags
);
6434 /* A constructor call is a non-trivial initializer even if
6435 it isn't explicitly written. */
6436 if (TREE_SIDE_EFFECTS (init_code
))
6437 DECL_NONTRIVIALLY_INITIALIZED_P (decl
) = true;
6439 /* If this is a constexpr initializer, expand_default_init will
6440 have returned an INIT_EXPR rather than a CALL_EXPR. In that
6441 case, pull the initializer back out and pass it down into
6442 store_init_value. */
6443 while (TREE_CODE (init_code
) == EXPR_STMT
6444 || TREE_CODE (init_code
) == CONVERT_EXPR
)
6445 init_code
= TREE_OPERAND (init_code
, 0);
6446 if (TREE_CODE (init_code
) == INIT_EXPR
)
6448 init
= TREE_OPERAND (init_code
, 1);
6449 init_code
= NULL_TREE
;
6450 /* Don't call digest_init; it's unnecessary and will complain
6451 about aggregate initialization of non-aggregate classes. */
6452 flags
|= LOOKUP_ALREADY_DIGESTED
;
6454 else if (DECL_DECLARED_CONSTEXPR_P (decl
))
6456 /* Declared constexpr, but no suitable initializer; massage
6457 init appropriately so we can pass it into store_init_value
6459 if (CLASS_TYPE_P (type
)
6460 && (!init
|| TREE_CODE (init
) == TREE_LIST
))
6462 init
= build_functional_cast (type
, init
, tf_none
);
6463 if (TREE_CODE (init
) == TARGET_EXPR
)
6464 TARGET_EXPR_DIRECT_INIT_P (init
) = true;
6466 init_code
= NULL_TREE
;
6472 if (init
&& TREE_CODE (init
) != TREE_VEC
)
6474 /* In aggregate initialization of a variable, each element
6475 initialization is a full-expression because there is no
6476 enclosing expression. */
6477 gcc_assert (stmts_are_full_exprs_p ());
6479 init_code
= store_init_value (decl
, init
, cleanups
, flags
);
6481 if (DECL_INITIAL (decl
)
6482 && TREE_CODE (DECL_INITIAL (decl
)) == CONSTRUCTOR
6483 && !vec_safe_is_empty (CONSTRUCTOR_ELTS (DECL_INITIAL (decl
))))
6485 tree elt
= CONSTRUCTOR_ELTS (DECL_INITIAL (decl
))->last ().value
;
6486 if (TREE_CODE (TREE_TYPE (elt
)) == ARRAY_TYPE
6487 && TYPE_SIZE (TREE_TYPE (elt
)) == NULL_TREE
)
6488 cp_complete_array_type (&TREE_TYPE (elt
), elt
, false);
6491 if (pedantic
&& TREE_CODE (type
) == ARRAY_TYPE
6492 && DECL_INITIAL (decl
)
6493 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
6494 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl
)))
6495 warning_at (cp_expr_loc_or_loc (DECL_INITIAL (decl
),
6496 DECL_SOURCE_LOCATION (decl
)),
6497 0, "array %qD initialized by parenthesized "
6498 "string literal %qE",
6499 decl
, DECL_INITIAL (decl
));
6505 if (CLASS_TYPE_P (core_type
= strip_array_types (type
))
6506 && (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type
)
6507 || CLASSTYPE_REF_FIELDS_NEED_INIT (core_type
)))
6508 diagnose_uninitialized_cst_or_ref_member (core_type
, /*using_new=*/false,
6511 check_for_uninitialized_const_var (decl
, /*constexpr_context_p=*/false,
6512 tf_warning_or_error
);
6515 if (init
&& init
!= error_mark_node
)
6516 init_code
= build2 (INIT_EXPR
, type
, decl
, init
);
6520 /* We might have set these in cp_finish_decl. */
6521 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
) = false;
6522 TREE_CONSTANT (decl
) = false;
6526 && (DECL_IN_AGGR_P (decl
)
6527 && DECL_INITIALIZED_IN_CLASS_P (decl
)
6528 && !DECL_VAR_DECLARED_INLINE_P (decl
)))
6530 static int explained
= 0;
6532 if (cxx_dialect
< cxx11
)
6533 error ("initializer invalid for static member with constructor");
6534 else if (cxx_dialect
< cxx17
)
6535 error ("non-constant in-class initialization invalid for static "
6536 "member %qD", decl
);
6538 error ("non-constant in-class initialization invalid for non-inline "
6539 "static member %qD", decl
);
6542 inform (input_location
,
6543 "(an out of class initialization is required)");
6552 /* If DECL is not a local variable, give it RTL. */
6555 make_rtl_for_nonlocal_decl (tree decl
, tree init
, const char* asmspec
)
6557 int toplev
= toplevel_bindings_p ();
6560 /* Set the DECL_ASSEMBLER_NAME for the object. */
6563 /* The `register' keyword, when used together with an
6564 asm-specification, indicates that the variable should be
6565 placed in a particular register. */
6566 if (VAR_P (decl
) && DECL_REGISTER (decl
))
6568 set_user_assembler_name (decl
, asmspec
);
6569 DECL_HARD_REGISTER (decl
) = 1;
6573 if (TREE_CODE (decl
) == FUNCTION_DECL
6574 && fndecl_built_in_p (decl
, BUILT_IN_NORMAL
))
6575 set_builtin_user_assembler_name (decl
, asmspec
);
6576 set_user_assembler_name (decl
, asmspec
);
6580 /* Handle non-variables up front. */
6583 rest_of_decl_compilation (decl
, toplev
, at_eof
);
6587 /* If we see a class member here, it should be a static data
6589 if (DECL_LANG_SPECIFIC (decl
) && DECL_IN_AGGR_P (decl
))
6591 gcc_assert (TREE_STATIC (decl
));
6592 /* An in-class declaration of a static data member should be
6593 external; it is only a declaration, and not a definition. */
6594 if (init
== NULL_TREE
)
6595 gcc_assert (DECL_EXTERNAL (decl
)
6596 || !TREE_PUBLIC (decl
)
6597 || DECL_INLINE_VAR_P (decl
));
6600 /* We don't create any RTL for local variables. */
6601 if (DECL_FUNCTION_SCOPE_P (decl
) && !TREE_STATIC (decl
))
6604 /* We defer emission of local statics until the corresponding
6605 DECL_EXPR is expanded. But with constexpr its function might never
6606 be expanded, so go ahead and tell cgraph about the variable now. */
6607 defer_p
= ((DECL_FUNCTION_SCOPE_P (decl
)
6608 && !var_in_maybe_constexpr_fn (decl
))
6609 || DECL_VIRTUAL_P (decl
));
6611 /* Defer template instantiations. */
6612 if (DECL_LANG_SPECIFIC (decl
)
6613 && DECL_IMPLICIT_INSTANTIATION (decl
))
6616 /* If we're not deferring, go ahead and assemble the variable. */
6618 rest_of_decl_compilation (decl
, toplev
, at_eof
);
6621 /* walk_tree helper for wrap_temporary_cleanups, below. */
6624 wrap_cleanups_r (tree
*stmt_p
, int *walk_subtrees
, void *data
)
6626 /* Stop at types or full-expression boundaries. */
6627 if (TYPE_P (*stmt_p
)
6628 || TREE_CODE (*stmt_p
) == CLEANUP_POINT_EXPR
)
6634 if (TREE_CODE (*stmt_p
) == TARGET_EXPR
)
6636 tree guard
= (tree
)data
;
6637 tree tcleanup
= TARGET_EXPR_CLEANUP (*stmt_p
);
6639 tcleanup
= build2 (TRY_CATCH_EXPR
, void_type_node
, tcleanup
, guard
);
6640 /* Tell honor_protect_cleanup_actions to handle this as a separate
6642 TRY_CATCH_IS_CLEANUP (tcleanup
) = 1;
6644 TARGET_EXPR_CLEANUP (*stmt_p
) = tcleanup
;
6650 /* We're initializing a local variable which has a cleanup GUARD. If there
6651 are any temporaries used in the initializer INIT of this variable, we
6652 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
6653 variable will be cleaned up properly if one of them throws.
6655 Unfortunately, there's no way to express this properly in terms of
6656 nesting, as the regions for the temporaries overlap the region for the
6657 variable itself; if there are two temporaries, the variable needs to be
6658 the first thing destroyed if either of them throws. However, we only
6659 want to run the variable's cleanup if it actually got constructed. So
6660 we need to guard the temporary cleanups with the variable's cleanup if
6661 they are run on the normal path, but not if they are run on the
6662 exceptional path. We implement this by telling
6663 honor_protect_cleanup_actions to strip the variable cleanup from the
6664 exceptional path. */
6667 wrap_temporary_cleanups (tree init
, tree guard
)
6669 cp_walk_tree_without_duplicates (&init
, wrap_cleanups_r
, (void *)guard
);
6672 /* Generate code to initialize DECL (a local variable). */
6675 initialize_local_var (tree decl
, tree init
)
6677 tree type
= TREE_TYPE (decl
);
6681 gcc_assert (VAR_P (decl
)
6682 || TREE_CODE (decl
) == RESULT_DECL
);
6683 gcc_assert (!TREE_STATIC (decl
));
6685 if (DECL_SIZE (decl
) == NULL_TREE
)
6687 /* If we used it already as memory, it must stay in memory. */
6688 DECL_INITIAL (decl
) = NULL_TREE
;
6689 TREE_ADDRESSABLE (decl
) = TREE_USED (decl
);
6693 if (type
== error_mark_node
)
6696 /* Compute and store the initial value. */
6697 already_used
= TREE_USED (decl
) || TREE_USED (type
);
6698 if (TREE_USED (type
))
6699 DECL_READ_P (decl
) = 1;
6701 /* Generate a cleanup, if necessary. */
6702 cleanup
= cxx_maybe_build_cleanup (decl
, tf_warning_or_error
);
6704 /* Perform the initialization. */
6707 tree rinit
= (TREE_CODE (init
) == INIT_EXPR
6708 ? TREE_OPERAND (init
, 1) : NULL_TREE
);
6709 if (rinit
&& !TREE_SIDE_EFFECTS (rinit
))
6711 /* Stick simple initializers in DECL_INITIAL so that
6712 -Wno-init-self works (c++/34772). */
6713 gcc_assert (TREE_OPERAND (init
, 0) == decl
);
6714 DECL_INITIAL (decl
) = rinit
;
6716 if (warn_init_self
&& TYPE_REF_P (type
))
6720 warning_at (DECL_SOURCE_LOCATION (decl
),
6722 "reference %qD is initialized with itself", decl
);
6727 int saved_stmts_are_full_exprs_p
;
6729 /* If we're only initializing a single object, guard the
6730 destructors of any temporaries used in its initializer with
6731 its destructor. This isn't right for arrays because each
6732 element initialization is a full-expression. */
6733 if (cleanup
&& TREE_CODE (type
) != ARRAY_TYPE
)
6734 wrap_temporary_cleanups (init
, cleanup
);
6736 gcc_assert (building_stmt_list_p ());
6737 saved_stmts_are_full_exprs_p
= stmts_are_full_exprs_p ();
6738 current_stmt_tree ()->stmts_are_full_exprs_p
= 1;
6739 finish_expr_stmt (init
);
6740 current_stmt_tree ()->stmts_are_full_exprs_p
=
6741 saved_stmts_are_full_exprs_p
;
6745 /* Set this to 0 so we can tell whether an aggregate which was
6746 initialized was ever used. Don't do this if it has a
6747 destructor, so we don't complain about the 'resource
6748 allocation is initialization' idiom. Now set
6749 attribute((unused)) on types so decls of that type will be
6750 marked used. (see TREE_USED, above.) */
6751 if (TYPE_NEEDS_CONSTRUCTING (type
)
6753 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type
)
6754 && DECL_NAME (decl
))
6755 TREE_USED (decl
) = 0;
6756 else if (already_used
)
6757 TREE_USED (decl
) = 1;
6760 finish_decl_cleanup (decl
, cleanup
);
6763 /* DECL is a VAR_DECL for a compiler-generated variable with static
6764 storage duration (like a virtual table) whose initializer is a
6765 compile-time constant. Initialize the variable and provide it to the
6769 initialize_artificial_var (tree decl
, vec
<constructor_elt
, va_gc
> *v
)
6772 gcc_assert (DECL_ARTIFICIAL (decl
));
6773 init
= build_constructor (TREE_TYPE (decl
), v
);
6774 gcc_assert (TREE_CODE (init
) == CONSTRUCTOR
);
6775 DECL_INITIAL (decl
) = init
;
6776 DECL_INITIALIZED_P (decl
) = 1;
6777 determine_visibility (decl
);
6778 layout_var_decl (decl
);
6779 maybe_commonize_var (decl
);
6780 make_rtl_for_nonlocal_decl (decl
, init
, /*asmspec=*/NULL
);
6783 /* INIT is the initializer for a variable, as represented by the
6784 parser. Returns true iff INIT is value-dependent. */
6787 value_dependent_init_p (tree init
)
6789 if (TREE_CODE (init
) == TREE_LIST
)
6790 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
6791 return any_value_dependent_elements_p (init
);
6792 else if (TREE_CODE (init
) == CONSTRUCTOR
)
6793 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
6795 if (dependent_type_p (TREE_TYPE (init
)))
6798 vec
<constructor_elt
, va_gc
> *elts
;
6802 elts
= CONSTRUCTOR_ELTS (init
);
6803 nelts
= vec_safe_length (elts
);
6804 for (i
= 0; i
< nelts
; ++i
)
6805 if (value_dependent_init_p ((*elts
)[i
].value
))
6809 /* It must be a simple expression, e.g., int i = 3; */
6810 return value_dependent_expression_p (init
);
6815 // Returns true if a DECL is VAR_DECL with the concept specifier.
6817 is_concept_var (tree decl
)
6819 return (VAR_P (decl
)
6820 // Not all variables have DECL_LANG_SPECIFIC.
6821 && DECL_LANG_SPECIFIC (decl
)
6822 && DECL_DECLARED_CONCEPT_P (decl
));
6825 /* A helper function to be called via walk_tree. If any label exists
6826 under *TP, it is (going to be) forced. Set has_forced_label_in_static. */
6829 notice_forced_label_r (tree
*tp
, int *walk_subtrees
, void *)
6833 if (TREE_CODE (*tp
) == LABEL_DECL
)
6834 cfun
->has_forced_label_in_static
= 1;
6838 /* Finish processing of a declaration;
6839 install its line number and initial value.
6840 If the length of an array type is not known before,
6841 it must be determined now, from the initial value, or it is an error.
6843 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
6844 true, then INIT is an integral constant expression.
6846 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
6847 if the (init) syntax was used. */
6850 cp_finish_decl (tree decl
, tree init
, bool init_const_expr_p
,
6851 tree asmspec_tree
, int flags
)
6854 vec
<tree
, va_gc
> *cleanups
= NULL
;
6855 const char *asmspec
= NULL
;
6856 int was_readonly
= 0;
6857 bool var_definition_p
= false;
6860 if (decl
== error_mark_node
)
6865 error ("assignment (not initialization) in declaration");
6869 gcc_assert (TREE_CODE (decl
) != RESULT_DECL
);
6870 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
6871 gcc_assert (TREE_CODE (decl
) != PARM_DECL
);
6873 type
= TREE_TYPE (decl
);
6874 if (type
== error_mark_node
)
6877 /* Warn about register storage specifiers except when in GNU global
6878 or local register variable extension. */
6879 if (VAR_P (decl
) && DECL_REGISTER (decl
) && asmspec_tree
== NULL_TREE
)
6881 if (cxx_dialect
>= cxx17
)
6882 pedwarn (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
6883 "ISO C++17 does not allow %<register%> storage "
6886 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
6887 "%<register%> storage class specifier used");
6890 /* If a name was specified, get the string. */
6891 if (at_namespace_scope_p ())
6892 asmspec_tree
= maybe_apply_renaming_pragma (decl
, asmspec_tree
);
6893 if (asmspec_tree
&& asmspec_tree
!= error_mark_node
)
6894 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
6896 if (current_class_type
6897 && CP_DECL_CONTEXT (decl
) == current_class_type
6898 && TYPE_BEING_DEFINED (current_class_type
)
6899 && !CLASSTYPE_TEMPLATE_INSTANTIATION (current_class_type
)
6900 && (DECL_INITIAL (decl
) || init
))
6901 DECL_INITIALIZED_IN_CLASS_P (decl
) = 1;
6903 /* Do auto deduction unless decl is a function or an uninstantiated
6904 template specialization. */
6905 if (TREE_CODE (decl
) != FUNCTION_DECL
6906 && !(init
== NULL_TREE
6907 && DECL_LANG_SPECIFIC (decl
)
6908 && DECL_TEMPLATE_INSTANTIATION (decl
)
6909 && !DECL_TEMPLATE_INSTANTIATED (decl
))
6910 && (auto_node
= type_uses_auto (type
)))
6913 if (init
== NULL_TREE
)
6914 gcc_assert (CLASS_PLACEHOLDER_TEMPLATE (auto_node
));
6918 if (TREE_CODE (d_init
) == TREE_LIST
6919 && !CLASS_PLACEHOLDER_TEMPLATE (auto_node
))
6920 d_init
= build_x_compound_expr_from_list (d_init
, ELK_INIT
,
6921 tf_warning_or_error
);
6922 d_init
= resolve_nondeduced_context (d_init
, tf_warning_or_error
);
6924 enum auto_deduction_context adc
= adc_variable_type
;
6925 if (VAR_P (decl
) && DECL_DECOMPOSITION_P (decl
))
6926 adc
= adc_decomp_type
;
6927 type
= TREE_TYPE (decl
) = do_auto_deduction (type
, d_init
, auto_node
,
6928 tf_warning_or_error
, adc
,
6930 if (type
== error_mark_node
)
6932 if (TREE_CODE (type
) == FUNCTION_TYPE
)
6934 error ("initializer for %<decltype(auto) %D%> has function type "
6935 "(did you forget the %<()%> ?)", decl
);
6936 TREE_TYPE (decl
) = error_mark_node
;
6939 cp_apply_type_quals_to_decl (cp_type_quals (type
), decl
);
6942 if (ensure_literal_type_for_constexpr_object (decl
) == error_mark_node
)
6944 DECL_DECLARED_CONSTEXPR_P (decl
) = 0;
6945 if (VAR_P (decl
) && DECL_CLASS_SCOPE_P (decl
))
6948 DECL_EXTERNAL (decl
) = 1;
6953 && DECL_CLASS_SCOPE_P (decl
)
6954 && DECL_INITIALIZED_IN_CLASS_P (decl
))
6955 check_static_variable_definition (decl
, type
);
6957 if (init
&& TREE_CODE (decl
) == FUNCTION_DECL
)
6960 if (init
== ridpointers
[(int)RID_DELETE
])
6962 /* FIXME check this is 1st decl. */
6963 DECL_DELETED_FN (decl
) = 1;
6964 DECL_DECLARED_INLINE_P (decl
) = 1;
6965 DECL_INITIAL (decl
) = error_mark_node
;
6966 FOR_EACH_CLONE (clone
, decl
)
6968 DECL_DELETED_FN (clone
) = 1;
6969 DECL_DECLARED_INLINE_P (clone
) = 1;
6970 DECL_INITIAL (clone
) = error_mark_node
;
6974 else if (init
== ridpointers
[(int)RID_DEFAULT
])
6976 if (defaultable_fn_check (decl
))
6977 DECL_DEFAULTED_FN (decl
) = 1;
6979 DECL_INITIAL (decl
) = NULL_TREE
;
6983 if (init
&& VAR_P (decl
))
6985 DECL_NONTRIVIALLY_INITIALIZED_P (decl
) = 1;
6986 /* If DECL is a reference, then we want to know whether init is a
6987 reference constant; init_const_expr_p as passed tells us whether
6988 it's an rvalue constant. */
6989 if (TYPE_REF_P (type
))
6990 init_const_expr_p
= potential_constant_expression (init
);
6991 if (init_const_expr_p
)
6993 /* Set these flags now for templates. We'll update the flags in
6994 store_init_value for instantiations. */
6995 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
) = 1;
6996 if (decl_maybe_constant_var_p (decl
)
6997 /* FIXME setting TREE_CONSTANT on refs breaks the back end. */
6998 && !TYPE_REF_P (type
))
6999 TREE_CONSTANT (decl
) = 1;
7003 if (processing_template_decl
)
7005 bool type_dependent_p
;
7007 /* Add this declaration to the statement-tree. */
7008 if (at_function_scope_p ())
7009 add_decl_expr (decl
);
7011 type_dependent_p
= dependent_type_p (type
);
7013 if (check_for_bare_parameter_packs (init
))
7016 DECL_INITIAL (decl
) = NULL_TREE
;
7019 /* Generally, initializers in templates are expanded when the
7020 template is instantiated. But, if DECL is a variable constant
7021 then it can be used in future constant expressions, so its value
7022 must be available. */
7024 bool dep_init
= false;
7026 if (!VAR_P (decl
) || type_dependent_p
)
7027 /* We can't do anything if the decl has dependent type. */;
7028 else if (!init
&& is_concept_var (decl
))
7030 error ("variable concept has no initializer");
7031 init
= boolean_true_node
;
7034 && init_const_expr_p
7035 && !TYPE_REF_P (type
)
7036 && decl_maybe_constant_var_p (decl
)
7037 && !(dep_init
= value_dependent_init_p (init
)))
7039 /* This variable seems to be a non-dependent constant, so process
7040 its initializer. If check_initializer returns non-null the
7041 initialization wasn't constant after all. */
7043 cleanups
= make_tree_vector ();
7044 init_code
= check_initializer (decl
, init
, flags
, &cleanups
);
7045 if (init_code
== NULL_TREE
)
7047 release_tree_vector (cleanups
);
7049 else if (!DECL_PRETTY_FUNCTION_P (decl
))
7051 /* Deduce array size even if the initializer is dependent. */
7052 maybe_deduce_size_from_array_init (decl
, init
);
7053 /* And complain about multiple initializers. */
7054 if (init
&& TREE_CODE (init
) == TREE_LIST
&& TREE_CHAIN (init
)
7055 && !MAYBE_CLASS_TYPE_P (type
))
7056 init
= build_x_compound_expr_from_list (init
, ELK_INIT
,
7057 tf_warning_or_error
);
7061 DECL_INITIAL (decl
) = init
;
7065 retrofit_lang_decl (decl
);
7066 SET_DECL_DEPENDENT_INIT_P (decl
, true);
7071 /* Just store non-static data member initializers for later. */
7072 if (init
&& TREE_CODE (decl
) == FIELD_DECL
)
7073 DECL_INITIAL (decl
) = init
;
7075 /* Take care of TYPE_DECLs up front. */
7076 if (TREE_CODE (decl
) == TYPE_DECL
)
7078 if (type
!= error_mark_node
7079 && MAYBE_CLASS_TYPE_P (type
) && DECL_NAME (decl
))
7081 if (TREE_TYPE (DECL_NAME (decl
)) && TREE_TYPE (decl
) != type
)
7082 warning (0, "shadowing previous type declaration of %q#D", decl
);
7083 set_identifier_type_value (DECL_NAME (decl
), decl
);
7086 /* If we have installed this as the canonical typedef for this
7087 type, and that type has not been defined yet, delay emitting
7088 the debug information for it, as we will emit it later. */
7089 if (TYPE_MAIN_DECL (TREE_TYPE (decl
)) == decl
7090 && !COMPLETE_TYPE_P (TREE_TYPE (decl
)))
7091 TYPE_DECL_SUPPRESS_DEBUG (decl
) = 1;
7093 rest_of_decl_compilation (decl
, DECL_FILE_SCOPE_P (decl
),
7098 /* A reference will be modified here, as it is initialized. */
7099 if (! DECL_EXTERNAL (decl
)
7100 && TREE_READONLY (decl
)
7101 && TYPE_REF_P (type
))
7104 TREE_READONLY (decl
) = 0;
7109 /* If this is a local variable that will need a mangled name,
7110 register it now. We must do this before processing the
7111 initializer for the variable, since the initialization might
7112 require a guard variable, and since the mangled name of the
7113 guard variable will depend on the mangled name of this
7115 if (DECL_FUNCTION_SCOPE_P (decl
)
7116 && TREE_STATIC (decl
)
7117 && !DECL_ARTIFICIAL (decl
))
7119 push_local_name (decl
);
7120 /* Normally has_forced_label_in_static is set during GIMPLE
7121 lowering, but [cd]tors are never actually compiled directly.
7122 We need to set this early so we can deal with the label
7123 address extension. */
7124 if ((DECL_CONSTRUCTOR_P (current_function_decl
)
7125 || DECL_DESTRUCTOR_P (current_function_decl
))
7128 walk_tree (&init
, notice_forced_label_r
, NULL
, NULL
);
7129 add_local_decl (cfun
, decl
);
7131 /* And make sure it's in the symbol table for
7132 c_parse_final_cleanups to find. */
7133 varpool_node::get_create (decl
);
7136 /* Convert the initializer to the type of DECL, if we have not
7137 already initialized DECL. */
7138 if (!DECL_INITIALIZED_P (decl
)
7139 /* If !DECL_EXTERNAL then DECL is being defined. In the
7140 case of a static data member initialized inside the
7141 class-specifier, there can be an initializer even if DECL
7142 is *not* defined. */
7143 && (!DECL_EXTERNAL (decl
) || init
))
7145 cleanups
= make_tree_vector ();
7146 init
= check_initializer (decl
, init
, flags
, &cleanups
);
7152 The memory occupied by any object of static storage
7153 duration is zero-initialized at program startup before
7154 any other initialization takes place.
7156 We cannot create an appropriate initializer until after
7157 the type of DECL is finalized. If DECL_INITIAL is set,
7158 then the DECL is statically initialized, and any
7159 necessary zero-initialization has already been performed. */
7160 if (TREE_STATIC (decl
) && !DECL_INITIAL (decl
))
7161 DECL_INITIAL (decl
) = build_zero_init (TREE_TYPE (decl
),
7162 /*nelts=*/NULL_TREE
,
7163 /*static_storage_p=*/true);
7164 /* Remember that the initialization for this variable has
7166 DECL_INITIALIZED_P (decl
) = 1;
7167 /* This declaration is the definition of this variable,
7168 unless we are initializing a static data member within
7169 the class specifier. */
7170 if (!DECL_EXTERNAL (decl
))
7171 var_definition_p
= true;
7173 /* If the variable has an array type, lay out the type, even if
7174 there is no initializer. It is valid to index through the
7175 array, and we must get TYPE_ALIGN set correctly on the array
7177 else if (TREE_CODE (type
) == ARRAY_TYPE
)
7180 if (TREE_STATIC (decl
)
7181 && !at_function_scope_p ()
7182 && current_function_decl
== NULL
)
7183 /* So decl is a global variable or a static member of a
7184 non local class. Record the types it uses
7185 so that we can decide later to emit debug info for them. */
7186 record_types_used_by_current_var_decl (decl
);
7189 /* Add this declaration to the statement-tree. This needs to happen
7190 after the call to check_initializer so that the DECL_EXPR for a
7191 reference temp is added before the DECL_EXPR for the reference itself. */
7192 if (DECL_FUNCTION_SCOPE_P (decl
))
7194 /* If we're building a variable sized type, and we might be
7195 reachable other than via the top of the current binding
7196 level, then create a new BIND_EXPR so that we deallocate
7197 the object at the right time. */
7200 && !TREE_CONSTANT (DECL_SIZE (decl
))
7201 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list
))
7204 bind
= build3 (BIND_EXPR
, void_type_node
, NULL
, NULL
, NULL
);
7205 TREE_SIDE_EFFECTS (bind
) = 1;
7207 BIND_EXPR_BODY (bind
) = push_stmt_list ();
7209 add_decl_expr (decl
);
7212 /* Let the middle end know about variables and functions -- but not
7213 static data members in uninstantiated class templates. */
7214 if (VAR_OR_FUNCTION_DECL_P (decl
))
7218 layout_var_decl (decl
);
7219 maybe_commonize_var (decl
);
7222 /* This needs to happen after the linkage is set. */
7223 determine_visibility (decl
);
7225 if (var_definition_p
&& TREE_STATIC (decl
))
7227 /* If a TREE_READONLY variable needs initialization
7228 at runtime, it is no longer readonly and we need to
7229 avoid MEM_READONLY_P being set on RTL created for it. */
7232 if (TREE_READONLY (decl
))
7233 TREE_READONLY (decl
) = 0;
7236 else if (was_readonly
)
7237 TREE_READONLY (decl
) = 1;
7239 /* Likewise if it needs destruction. */
7240 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
))
7241 TREE_READONLY (decl
) = 0;
7244 make_rtl_for_nonlocal_decl (decl
, init
, asmspec
);
7246 /* Check for abstractness of the type. Notice that there is no
7247 need to strip array types here since the check for those types
7248 is already done within create_array_type_for_decl. */
7249 abstract_virtuals_error (decl
, type
);
7251 if (TREE_TYPE (decl
) == error_mark_node
)
7252 /* No initialization required. */
7254 else if (TREE_CODE (decl
) == FUNCTION_DECL
)
7258 if (init
== ridpointers
[(int)RID_DEFAULT
])
7260 /* An out-of-class default definition is defined at
7261 the point where it is explicitly defaulted. */
7262 if (DECL_DELETED_FN (decl
))
7263 maybe_explain_implicit_delete (decl
);
7264 else if (DECL_INITIAL (decl
) == error_mark_node
)
7265 synthesize_method (decl
);
7268 error ("function %q#D is initialized like a variable", decl
);
7270 /* else no initialization required. */
7272 else if (DECL_EXTERNAL (decl
)
7273 && ! (DECL_LANG_SPECIFIC (decl
)
7274 && DECL_NOT_REALLY_EXTERN (decl
)))
7277 DECL_INITIAL (decl
) = init
;
7279 /* A variable definition. */
7280 else if (DECL_FUNCTION_SCOPE_P (decl
) && !TREE_STATIC (decl
))
7281 /* Initialize the local variable. */
7282 initialize_local_var (decl
, init
);
7284 /* If a variable is defined, and then a subsequent
7285 definition with external linkage is encountered, we will
7286 get here twice for the same variable. We want to avoid
7287 calling expand_static_init more than once. For variables
7288 that are not static data members, we can call
7289 expand_static_init only when we actually process the
7290 initializer. It is not legal to redeclare a static data
7291 member, so this issue does not arise in that case. */
7292 else if (var_definition_p
&& TREE_STATIC (decl
))
7293 expand_static_init (decl
, init
);
7296 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
7297 reference, insert it in the statement-tree now. */
7301 FOR_EACH_VEC_ELT (*cleanups
, i
, t
)
7302 push_cleanup (decl
, t
, false);
7303 release_tree_vector (cleanups
);
7307 TREE_READONLY (decl
) = 1;
7311 && lookup_attribute ("omp declare target implicit",
7312 DECL_ATTRIBUTES (decl
)))
7314 DECL_ATTRIBUTES (decl
)
7315 = remove_attribute ("omp declare target implicit",
7316 DECL_ATTRIBUTES (decl
));
7317 complete_type (TREE_TYPE (decl
));
7318 if (!cp_omp_mappable_type (TREE_TYPE (decl
)))
7319 error ("%q+D in declare target directive does not have mappable type",
7321 else if (!lookup_attribute ("omp declare target",
7322 DECL_ATTRIBUTES (decl
))
7323 && !lookup_attribute ("omp declare target link",
7324 DECL_ATTRIBUTES (decl
)))
7325 DECL_ATTRIBUTES (decl
)
7326 = tree_cons (get_identifier ("omp declare target"),
7327 NULL_TREE
, DECL_ATTRIBUTES (decl
));
7330 invoke_plugin_callbacks (PLUGIN_FINISH_DECL
, decl
);
7333 /* For class TYPE return itself or some its bases that contain
7334 any direct non-static data members. Return error_mark_node if an
7335 error has been diagnosed. */
7338 find_decomp_class_base (location_t loc
, tree type
, tree ret
)
7340 bool member_seen
= false;
7341 for (tree field
= TYPE_FIELDS (type
); field
; field
= DECL_CHAIN (field
))
7342 if (TREE_CODE (field
) != FIELD_DECL
7343 || DECL_ARTIFICIAL (field
)
7344 || DECL_UNNAMED_BIT_FIELD (field
))
7348 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field
)))
7350 if (TREE_CODE (TREE_TYPE (field
)) == RECORD_TYPE
)
7351 error_at (loc
, "cannot decompose class type %qT because it has an "
7352 "anonymous struct member", type
);
7354 error_at (loc
, "cannot decompose class type %qT because it has an "
7355 "anonymous union member", type
);
7356 inform (DECL_SOURCE_LOCATION (field
), "declared here");
7357 return error_mark_node
;
7359 else if (!accessible_p (type
, field
, true))
7361 error_at (loc
, "cannot decompose inaccessible member %qD of %qT",
7363 inform (DECL_SOURCE_LOCATION (field
),
7364 TREE_PRIVATE (field
)
7365 ? G_("declared private here")
7366 : G_("declared protected here"));
7367 return error_mark_node
;
7372 tree base_binfo
, binfo
;
7373 tree orig_ret
= ret
;
7377 for (binfo
= TYPE_BINFO (type
), i
= 0;
7378 BINFO_BASE_ITERATE (binfo
, i
, base_binfo
); i
++)
7380 tree t
= find_decomp_class_base (loc
, TREE_TYPE (base_binfo
), ret
);
7381 if (t
== error_mark_node
)
7382 return error_mark_node
;
7383 if (t
!= NULL_TREE
&& t
!= ret
)
7387 error_at (loc
, "cannot decompose class type %qT: both it and "
7388 "its base class %qT have non-static data members",
7390 return error_mark_node
;
7392 else if (orig_ret
!= NULL_TREE
)
7394 else if (ret
!= NULL_TREE
)
7396 error_at (loc
, "cannot decompose class type %qT: its base "
7397 "classes %qT and %qT have non-static data "
7398 "members", type
, ret
, t
);
7399 return error_mark_node
;
7408 /* Return std::tuple_size<TYPE>::value. */
7411 get_tuple_size (tree type
)
7413 tree args
= make_tree_vec (1);
7414 TREE_VEC_ELT (args
, 0) = type
;
7415 tree inst
= lookup_template_class (tuple_size_identifier
, args
,
7416 /*in_decl*/NULL_TREE
,
7417 /*context*/std_node
,
7418 /*entering_scope*/false, tf_none
);
7419 inst
= complete_type (inst
);
7420 if (inst
== error_mark_node
|| !COMPLETE_TYPE_P (inst
))
7422 tree val
= lookup_qualified_name (inst
, value_identifier
,
7423 /*type*/false, /*complain*/false);
7424 if (TREE_CODE (val
) == VAR_DECL
|| TREE_CODE (val
) == CONST_DECL
)
7425 val
= maybe_constant_value (val
);
7426 if (TREE_CODE (val
) == INTEGER_CST
)
7429 return error_mark_node
;
7432 /* Return std::tuple_element<I,TYPE>::type. */
7435 get_tuple_element_type (tree type
, unsigned i
)
7437 tree args
= make_tree_vec (2);
7438 TREE_VEC_ELT (args
, 0) = build_int_cst (integer_type_node
, i
);
7439 TREE_VEC_ELT (args
, 1) = type
;
7440 tree inst
= lookup_template_class (tuple_element_identifier
, args
,
7441 /*in_decl*/NULL_TREE
,
7442 /*context*/std_node
,
7443 /*entering_scope*/false,
7444 tf_warning_or_error
);
7445 return make_typename_type (inst
, type_identifier
,
7446 none_type
, tf_warning_or_error
);
7449 /* Return e.get<i>() or get<i>(e). */
7452 get_tuple_decomp_init (tree decl
, unsigned i
)
7454 tree targs
= make_tree_vec (1);
7455 TREE_VEC_ELT (targs
, 0) = build_int_cst (integer_type_node
, i
);
7457 tree etype
= TREE_TYPE (decl
);
7458 tree e
= convert_from_reference (decl
);
7460 /* [The id-expression] e is an lvalue if the type of the entity e is an
7461 lvalue reference and an xvalue otherwise. */
7462 if (!TYPE_REF_P (etype
)
7463 || TYPE_REF_IS_RVALUE (etype
))
7466 tree fns
= lookup_qualified_name (TREE_TYPE (e
), get__identifier
,
7467 /*type*/false, /*complain*/false);
7468 bool use_member_get
= false;
7470 /* To use a member get, member lookup must find at least one
7471 declaration that is a function template
7472 whose first template parameter is a non-type parameter. */
7473 for (lkp_iterator
iter (MAYBE_BASELINK_FUNCTIONS (fns
)); iter
; ++iter
)
7476 if (TREE_CODE (fn
) == TEMPLATE_DECL
)
7478 tree tparms
= DECL_TEMPLATE_PARMS (fn
);
7479 tree parm
= TREE_VEC_ELT (INNERMOST_TEMPLATE_PARMS (tparms
), 0);
7480 if (TREE_CODE (TREE_VALUE (parm
)) == PARM_DECL
)
7482 use_member_get
= true;
7490 fns
= lookup_template_function (fns
, targs
);
7491 return build_new_method_call (e
, fns
, /*args*/NULL
,
7492 /*path*/NULL_TREE
, LOOKUP_NORMAL
,
7493 /*fn_p*/NULL
, tf_warning_or_error
);
7497 vec
<tree
,va_gc
> *args
= make_tree_vector_single (e
);
7498 fns
= lookup_template_function (get__identifier
, targs
);
7499 fns
= perform_koenig_lookup (fns
, args
, tf_warning_or_error
);
7500 return finish_call_expr (fns
, &args
, /*novirt*/false,
7501 /*koenig*/true, tf_warning_or_error
);
7505 /* It's impossible to recover the decltype of a tuple decomposition variable
7506 based on the actual type of the variable, so store it in a hash table. */
7508 static GTY((cache
)) tree_cache_map
*decomp_type_table
;
7510 store_decomp_type (tree v
, tree t
)
7512 if (!decomp_type_table
)
7513 decomp_type_table
= tree_cache_map::create_ggc (13);
7514 decomp_type_table
->put (v
, t
);
7518 lookup_decomp_type (tree v
)
7520 return *decomp_type_table
->get (v
);
7523 /* Mangle a decomposition declaration if needed. Arguments like
7524 in cp_finish_decomp. */
7527 cp_maybe_mangle_decomp (tree decl
, tree first
, unsigned int count
)
7529 if (!processing_template_decl
7530 && !error_operand_p (decl
)
7531 && DECL_NAMESPACE_SCOPE_P (decl
))
7533 auto_vec
<tree
, 16> v
;
7534 v
.safe_grow (count
);
7536 for (unsigned int i
= 0; i
< count
; i
++, d
= DECL_CHAIN (d
))
7537 v
[count
- i
- 1] = d
;
7538 SET_DECL_ASSEMBLER_NAME (decl
, mangle_decomp (decl
, v
));
7539 maybe_apply_pragma_weak (decl
);
7543 /* Finish a decomposition declaration. DECL is the underlying declaration
7544 "e", FIRST is the head of a chain of decls for the individual identifiers
7545 chained through DECL_CHAIN in reverse order and COUNT is the number of
7549 cp_finish_decomp (tree decl
, tree first
, unsigned int count
)
7551 if (error_operand_p (decl
))
7556 TREE_TYPE (first
) = error_mark_node
;
7557 if (DECL_HAS_VALUE_EXPR_P (first
))
7559 SET_DECL_VALUE_EXPR (first
, NULL_TREE
);
7560 DECL_HAS_VALUE_EXPR_P (first
) = 0;
7562 first
= DECL_CHAIN (first
);
7564 if (DECL_P (decl
) && DECL_NAMESPACE_SCOPE_P (decl
))
7565 SET_DECL_ASSEMBLER_NAME (decl
, get_identifier ("<decomp>"));
7569 location_t loc
= DECL_SOURCE_LOCATION (decl
);
7570 if (type_dependent_expression_p (decl
)
7571 /* This happens for range for when not in templates.
7572 Still add the DECL_VALUE_EXPRs for later processing. */
7573 || (!processing_template_decl
7574 && type_uses_auto (TREE_TYPE (decl
))))
7576 for (unsigned int i
= 0; i
< count
; i
++)
7578 if (!DECL_HAS_VALUE_EXPR_P (first
))
7580 tree v
= build_nt (ARRAY_REF
, decl
,
7581 size_int (count
- i
- 1),
7582 NULL_TREE
, NULL_TREE
);
7583 SET_DECL_VALUE_EXPR (first
, v
);
7584 DECL_HAS_VALUE_EXPR_P (first
) = 1;
7586 if (processing_template_decl
)
7587 fit_decomposition_lang_decl (first
, decl
);
7588 first
= DECL_CHAIN (first
);
7593 auto_vec
<tree
, 16> v
;
7594 v
.safe_grow (count
);
7596 for (unsigned int i
= 0; i
< count
; i
++, d
= DECL_CHAIN (d
))
7598 v
[count
- i
- 1] = d
;
7599 fit_decomposition_lang_decl (d
, decl
);
7602 tree type
= TREE_TYPE (decl
);
7605 if (TYPE_REF_P (type
))
7607 dexp
= convert_from_reference (dexp
);
7608 type
= complete_type (TREE_TYPE (type
));
7609 if (type
== error_mark_node
)
7611 if (!COMPLETE_TYPE_P (type
))
7613 error_at (loc
, "structured binding refers to incomplete type %qT",
7619 tree eltype
= NULL_TREE
;
7620 unsigned HOST_WIDE_INT eltscnt
= 0;
7621 if (TREE_CODE (type
) == ARRAY_TYPE
)
7624 nelts
= array_type_nelts_top (type
);
7625 if (nelts
== error_mark_node
)
7627 if (!tree_fits_uhwi_p (nelts
))
7629 error_at (loc
, "cannot decompose variable length array %qT", type
);
7632 eltscnt
= tree_to_uhwi (nelts
);
7633 if (count
!= eltscnt
)
7636 if (count
> eltscnt
)
7637 error_n (loc
, count
,
7638 "%u name provided for structured binding",
7639 "%u names provided for structured binding", count
);
7641 error_n (loc
, count
,
7642 "only %u name provided for structured binding",
7643 "only %u names provided for structured binding", count
);
7644 inform_n (loc
, eltscnt
,
7645 "while %qT decomposes into %wu element",
7646 "while %qT decomposes into %wu elements",
7650 eltype
= TREE_TYPE (type
);
7651 for (unsigned int i
= 0; i
< count
; i
++)
7653 TREE_TYPE (v
[i
]) = eltype
;
7654 layout_decl (v
[i
], 0);
7655 if (processing_template_decl
)
7657 tree t
= unshare_expr (dexp
);
7658 t
= build4_loc (DECL_SOURCE_LOCATION (v
[i
]), ARRAY_REF
,
7659 eltype
, t
, size_int (i
), NULL_TREE
,
7661 SET_DECL_VALUE_EXPR (v
[i
], t
);
7662 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7665 /* 2 GNU extensions. */
7666 else if (TREE_CODE (type
) == COMPLEX_TYPE
)
7669 if (count
!= eltscnt
)
7671 eltype
= cp_build_qualified_type (TREE_TYPE (type
), TYPE_QUALS (type
));
7672 for (unsigned int i
= 0; i
< count
; i
++)
7674 TREE_TYPE (v
[i
]) = eltype
;
7675 layout_decl (v
[i
], 0);
7676 if (processing_template_decl
)
7678 tree t
= unshare_expr (dexp
);
7679 t
= build1_loc (DECL_SOURCE_LOCATION (v
[i
]),
7680 i
? IMAGPART_EXPR
: REALPART_EXPR
, eltype
,
7682 SET_DECL_VALUE_EXPR (v
[i
], t
);
7683 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7686 else if (TREE_CODE (type
) == VECTOR_TYPE
)
7688 if (!TYPE_VECTOR_SUBPARTS (type
).is_constant (&eltscnt
))
7690 error_at (loc
, "cannot decompose variable length vector %qT", type
);
7693 if (count
!= eltscnt
)
7695 eltype
= cp_build_qualified_type (TREE_TYPE (type
), TYPE_QUALS (type
));
7696 for (unsigned int i
= 0; i
< count
; i
++)
7698 TREE_TYPE (v
[i
]) = eltype
;
7699 layout_decl (v
[i
], 0);
7700 if (processing_template_decl
)
7702 tree t
= unshare_expr (dexp
);
7703 convert_vector_to_array_for_subscript (DECL_SOURCE_LOCATION (v
[i
]),
7705 t
= build4_loc (DECL_SOURCE_LOCATION (v
[i
]), ARRAY_REF
,
7706 eltype
, t
, size_int (i
), NULL_TREE
,
7708 SET_DECL_VALUE_EXPR (v
[i
], t
);
7709 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7712 else if (tree tsize
= get_tuple_size (type
))
7714 if (tsize
== error_mark_node
)
7716 error_at (loc
, "%<std::tuple_size<%T>::value%> is not an integral "
7717 "constant expression", type
);
7720 if (!tree_fits_uhwi_p (tsize
))
7722 error_n (loc
, count
,
7723 "%u name provided for structured binding",
7724 "%u names provided for structured binding", count
);
7725 inform (loc
, "while %qT decomposes into %E elements",
7729 eltscnt
= tree_to_uhwi (tsize
);
7730 if (count
!= eltscnt
)
7732 int save_read
= DECL_READ_P (decl
);
7733 for (unsigned i
= 0; i
< count
; ++i
)
7735 location_t sloc
= input_location
;
7736 location_t dloc
= DECL_SOURCE_LOCATION (v
[i
]);
7738 input_location
= dloc
;
7739 tree init
= get_tuple_decomp_init (decl
, i
);
7740 tree eltype
= (init
== error_mark_node
? error_mark_node
7741 : get_tuple_element_type (type
, i
));
7742 input_location
= sloc
;
7744 if (init
== error_mark_node
|| eltype
== error_mark_node
)
7746 inform (dloc
, "in initialization of structured binding "
7747 "variable %qD", v
[i
]);
7750 /* Save the decltype away before reference collapse. */
7751 store_decomp_type (v
[i
], eltype
);
7752 eltype
= cp_build_reference_type (eltype
, !lvalue_p (init
));
7753 TREE_TYPE (v
[i
]) = eltype
;
7754 layout_decl (v
[i
], 0);
7755 if (DECL_HAS_VALUE_EXPR_P (v
[i
]))
7757 /* In this case the names are variables, not just proxies. */
7758 SET_DECL_VALUE_EXPR (v
[i
], NULL_TREE
);
7759 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 0;
7761 if (!processing_template_decl
)
7762 cp_finish_decl (v
[i
], init
, /*constexpr*/false,
7763 /*asm*/NULL_TREE
, LOOKUP_NORMAL
);
7765 /* Ignore reads from the underlying decl performed during initialization
7766 of the individual variables. If those will be read, we'll mark
7767 the underlying decl as read at that point. */
7768 DECL_READ_P (decl
) = save_read
;
7770 else if (TREE_CODE (type
) == UNION_TYPE
)
7772 error_at (loc
, "cannot decompose union type %qT", type
);
7775 else if (!CLASS_TYPE_P (type
))
7777 error_at (loc
, "cannot decompose non-array non-class type %qT", type
);
7780 else if (LAMBDA_TYPE_P (type
))
7782 error_at (loc
, "cannot decompose lambda closure type %qT", type
);
7785 else if (processing_template_decl
&& !COMPLETE_TYPE_P (type
))
7786 pedwarn (loc
, 0, "structured binding refers to incomplete class type %qT",
7790 tree btype
= find_decomp_class_base (loc
, type
, NULL_TREE
);
7791 if (btype
== error_mark_node
)
7793 else if (btype
== NULL_TREE
)
7795 error_at (loc
, "cannot decompose class type %qT without non-static "
7796 "data members", type
);
7799 for (tree field
= TYPE_FIELDS (btype
); field
; field
= TREE_CHAIN (field
))
7800 if (TREE_CODE (field
) != FIELD_DECL
7801 || DECL_ARTIFICIAL (field
)
7802 || DECL_UNNAMED_BIT_FIELD (field
))
7806 if (count
!= eltscnt
)
7811 t
= convert_to_base (t
, btype
, /*check_access*/true,
7812 /*nonnull*/false, tf_warning_or_error
);
7816 for (tree field
= TYPE_FIELDS (btype
); field
; field
= TREE_CHAIN (field
))
7817 if (TREE_CODE (field
) != FIELD_DECL
7818 || DECL_ARTIFICIAL (field
)
7819 || DECL_UNNAMED_BIT_FIELD (field
))
7823 tree tt
= finish_non_static_data_member (field
, unshare_expr (t
),
7825 if (REFERENCE_REF_P (tt
))
7826 tt
= TREE_OPERAND (tt
, 0);
7827 TREE_TYPE (v
[i
]) = TREE_TYPE (tt
);
7828 layout_decl (v
[i
], 0);
7829 if (!processing_template_decl
)
7831 SET_DECL_VALUE_EXPR (v
[i
], tt
);
7832 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7837 if (processing_template_decl
)
7839 for (unsigned int i
= 0; i
< count
; i
++)
7840 if (!DECL_HAS_VALUE_EXPR_P (v
[i
]))
7842 tree a
= build_nt (ARRAY_REF
, decl
, size_int (i
),
7843 NULL_TREE
, NULL_TREE
);
7844 SET_DECL_VALUE_EXPR (v
[i
], a
);
7845 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7850 /* Returns a declaration for a VAR_DECL as if:
7852 extern "C" TYPE NAME;
7854 had been seen. Used to create compiler-generated global
7858 declare_global_var (tree name
, tree type
)
7862 push_to_top_level ();
7863 decl
= build_decl (input_location
, VAR_DECL
, name
, type
);
7864 TREE_PUBLIC (decl
) = 1;
7865 DECL_EXTERNAL (decl
) = 1;
7866 DECL_ARTIFICIAL (decl
) = 1;
7867 DECL_CONTEXT (decl
) = FROB_CONTEXT (global_namespace
);
7868 /* If the user has explicitly declared this variable (perhaps
7869 because the code we are compiling is part of a low-level runtime
7870 library), then it is possible that our declaration will be merged
7871 with theirs by pushdecl. */
7872 decl
= pushdecl (decl
);
7873 cp_finish_decl (decl
, NULL_TREE
, false, NULL_TREE
, 0);
7874 pop_from_top_level ();
7879 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
7880 if "__cxa_atexit" is not being used) corresponding to the function
7881 to be called when the program exits. */
7884 get_atexit_fn_ptr_type (void)
7888 if (!atexit_fn_ptr_type_node
)
7891 if (flag_use_cxa_atexit
7892 && !targetm
.cxx
.use_atexit_for_cxa_atexit ())
7893 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
7894 arg_type
= ptr_type_node
;
7896 /* The parameter to "atexit" is "void (*)(void)". */
7897 arg_type
= NULL_TREE
;
7899 fn_type
= build_function_type_list (void_type_node
,
7900 arg_type
, NULL_TREE
);
7901 atexit_fn_ptr_type_node
= build_pointer_type (fn_type
);
7904 return atexit_fn_ptr_type_node
;
7907 /* Returns a pointer to the `atexit' function. Note that if
7908 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
7909 `__cxa_atexit' function specified in the IA64 C++ ABI. */
7912 get_atexit_node (void)
7918 bool use_aeabi_atexit
;
7923 if (flag_use_cxa_atexit
&& !targetm
.cxx
.use_atexit_for_cxa_atexit ())
7925 /* The declaration for `__cxa_atexit' is:
7927 int __cxa_atexit (void (*)(void *), void *, void *)
7929 We build up the argument types and then the function type
7931 tree argtype0
, argtype1
, argtype2
;
7933 use_aeabi_atexit
= targetm
.cxx
.use_aeabi_atexit ();
7934 /* First, build the pointer-to-function type for the first
7936 fn_ptr_type
= get_atexit_fn_ptr_type ();
7937 /* Then, build the rest of the argument types. */
7938 argtype2
= ptr_type_node
;
7939 if (use_aeabi_atexit
)
7941 argtype1
= fn_ptr_type
;
7942 argtype0
= ptr_type_node
;
7946 argtype1
= ptr_type_node
;
7947 argtype0
= fn_ptr_type
;
7949 /* And the final __cxa_atexit type. */
7950 fn_type
= build_function_type_list (integer_type_node
,
7951 argtype0
, argtype1
, argtype2
,
7953 if (use_aeabi_atexit
)
7954 name
= "__aeabi_atexit";
7956 name
= "__cxa_atexit";
7960 /* The declaration for `atexit' is:
7962 int atexit (void (*)());
7964 We build up the argument types and then the function type
7966 fn_ptr_type
= get_atexit_fn_ptr_type ();
7967 /* Build the final atexit type. */
7968 fn_type
= build_function_type_list (integer_type_node
,
7969 fn_ptr_type
, NULL_TREE
);
7973 /* Now, build the function declaration. */
7974 push_lang_context (lang_name_c
);
7975 atexit_fndecl
= build_library_fn_ptr (name
, fn_type
, ECF_LEAF
| ECF_NOTHROW
);
7976 mark_used (atexit_fndecl
);
7977 pop_lang_context ();
7978 atexit_node
= decay_conversion (atexit_fndecl
, tf_warning_or_error
);
7983 /* Like get_atexit_node, but for thread-local cleanups. */
7986 get_thread_atexit_node (void)
7988 /* The declaration for `__cxa_thread_atexit' is:
7990 int __cxa_thread_atexit (void (*)(void *), void *, void *) */
7991 tree fn_type
= build_function_type_list (integer_type_node
,
7992 get_atexit_fn_ptr_type (),
7993 ptr_type_node
, ptr_type_node
,
7996 /* Now, build the function declaration. */
7997 tree atexit_fndecl
= build_library_fn_ptr ("__cxa_thread_atexit", fn_type
,
7998 ECF_LEAF
| ECF_NOTHROW
);
7999 return decay_conversion (atexit_fndecl
, tf_warning_or_error
);
8002 /* Returns the __dso_handle VAR_DECL. */
8005 get_dso_handle_node (void)
8007 if (dso_handle_node
)
8008 return dso_handle_node
;
8010 /* Declare the variable. */
8011 dso_handle_node
= declare_global_var (get_identifier ("__dso_handle"),
8014 #ifdef HAVE_GAS_HIDDEN
8015 if (dso_handle_node
!= error_mark_node
)
8017 DECL_VISIBILITY (dso_handle_node
) = VISIBILITY_HIDDEN
;
8018 DECL_VISIBILITY_SPECIFIED (dso_handle_node
) = 1;
8022 return dso_handle_node
;
8025 /* Begin a new function with internal linkage whose job will be simply
8026 to destroy some particular variable. */
8028 static GTY(()) int start_cleanup_cnt
;
8031 start_cleanup_fn (void)
8036 bool use_cxa_atexit
= flag_use_cxa_atexit
8037 && !targetm
.cxx
.use_atexit_for_cxa_atexit ();
8039 push_to_top_level ();
8041 /* No need to mangle this. */
8042 push_lang_context (lang_name_c
);
8044 /* Build the name of the function. */
8045 sprintf (name
, "__tcf_%d", start_cleanup_cnt
++);
8046 /* Build the function declaration. */
8047 fntype
= TREE_TYPE (get_atexit_fn_ptr_type ());
8048 fndecl
= build_lang_decl (FUNCTION_DECL
, get_identifier (name
), fntype
);
8049 /* It's a function with internal linkage, generated by the
8051 TREE_PUBLIC (fndecl
) = 0;
8052 DECL_ARTIFICIAL (fndecl
) = 1;
8053 /* Make the function `inline' so that it is only emitted if it is
8054 actually needed. It is unlikely that it will be inlined, since
8055 it is only called via a function pointer, but we avoid unnecessary
8056 emissions this way. */
8057 DECL_DECLARED_INLINE_P (fndecl
) = 1;
8058 DECL_INTERFACE_KNOWN (fndecl
) = 1;
8059 /* Build the parameter. */
8062 tree parmdecl
= cp_build_parm_decl (fndecl
, NULL_TREE
, ptr_type_node
);
8063 TREE_USED (parmdecl
) = 1;
8064 DECL_READ_P (parmdecl
) = 1;
8065 DECL_ARGUMENTS (fndecl
) = parmdecl
;
8069 start_preparsed_function (fndecl
, NULL_TREE
, SF_PRE_PARSED
);
8071 pop_lang_context ();
8073 return current_function_decl
;
8076 /* Finish the cleanup function begun by start_cleanup_fn. */
8079 end_cleanup_fn (void)
8081 expand_or_defer_fn (finish_function (/*inline_p=*/false));
8083 pop_from_top_level ();
8086 /* Generate code to handle the destruction of DECL, an object with
8087 static storage duration. */
8090 register_dtor_fn (tree decl
)
8097 bool ob_parm
, dso_parm
, use_dtor
;
8098 tree arg0
, arg1
, arg2
;
8101 type
= TREE_TYPE (decl
);
8102 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type
))
8105 /* If we're using "__cxa_atexit" (or "__cxa_thread_atexit" or
8106 "__aeabi_atexit"), and DECL is a class object, we can just pass the
8107 destructor to "__cxa_atexit"; we don't have to build a temporary
8108 function to do the cleanup. */
8109 dso_parm
= (flag_use_cxa_atexit
8110 && !targetm
.cxx
.use_atexit_for_cxa_atexit ());
8111 ob_parm
= (CP_DECL_THREAD_LOCAL_P (decl
) || dso_parm
);
8112 use_dtor
= ob_parm
&& CLASS_TYPE_P (type
);
8115 cleanup
= get_class_binding (type
, complete_dtor_identifier
);
8117 /* Make sure it is accessible. */
8118 perform_or_defer_access_check (TYPE_BINFO (type
), cleanup
, cleanup
,
8119 tf_warning_or_error
);
8123 /* Call build_cleanup before we enter the anonymous function so
8124 that any access checks will be done relative to the current
8125 scope, rather than the scope of the anonymous function. */
8126 build_cleanup (decl
);
8128 /* Now start the function. */
8129 cleanup
= start_cleanup_fn ();
8131 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
8132 to the original function, rather than the anonymous one. That
8133 will make the back end think that nested functions are in use,
8134 which causes confusion. */
8135 push_deferring_access_checks (dk_no_check
);
8136 fcall
= build_cleanup (decl
);
8137 pop_deferring_access_checks ();
8139 /* Create the body of the anonymous function. */
8140 compound_stmt
= begin_compound_stmt (BCS_FN_BODY
);
8141 finish_expr_stmt (fcall
);
8142 finish_compound_stmt (compound_stmt
);
8146 /* Call atexit with the cleanup function. */
8147 mark_used (cleanup
);
8148 cleanup
= build_address (cleanup
);
8150 if (CP_DECL_THREAD_LOCAL_P (decl
))
8151 atex_node
= get_thread_atexit_node ();
8153 atex_node
= get_atexit_node ();
8157 /* We must convert CLEANUP to the type that "__cxa_atexit"
8159 cleanup
= build_nop (get_atexit_fn_ptr_type (), cleanup
);
8160 /* "__cxa_atexit" will pass the address of DECL to the
8161 cleanup function. */
8163 addr
= build_address (decl
);
8164 /* The declared type of the parameter to "__cxa_atexit" is
8165 "void *". For plain "T*", we could just let the
8166 machinery in cp_build_function_call convert it -- but if the
8167 type is "cv-qualified T *", then we need to convert it
8168 before passing it in, to avoid spurious errors. */
8169 addr
= build_nop (ptr_type_node
, addr
);
8172 /* Since the cleanup functions we build ignore the address
8173 they're given, there's no reason to pass the actual address
8174 in, and, in general, it's cheaper to pass NULL than any
8176 addr
= null_pointer_node
;
8179 arg2
= cp_build_addr_expr (get_dso_handle_node (),
8180 tf_warning_or_error
);
8182 /* Just pass NULL to the dso handle parm if we don't actually
8183 have a DSO handle on this target. */
8184 arg2
= null_pointer_node
;
8190 if (!CP_DECL_THREAD_LOCAL_P (decl
)
8191 && targetm
.cxx
.use_aeabi_atexit ())
8207 return cp_build_function_call_nary (atex_node
, tf_warning_or_error
,
8208 arg0
, arg1
, arg2
, NULL_TREE
);
8211 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
8212 is its initializer. Generate code to handle the construction
8213 and destruction of DECL. */
8216 expand_static_init (tree decl
, tree init
)
8218 gcc_assert (VAR_P (decl
));
8219 gcc_assert (TREE_STATIC (decl
));
8221 /* Some variables require no dynamic initialization. */
8222 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl
)))
8224 /* Make sure the destructor is callable. */
8225 cxx_maybe_build_cleanup (decl
, tf_warning_or_error
);
8230 if (CP_DECL_THREAD_LOCAL_P (decl
) && DECL_GNU_TLS_P (decl
)
8231 && !DECL_FUNCTION_SCOPE_P (decl
))
8234 error ("non-local variable %qD declared %<__thread%> "
8235 "needs dynamic initialization", decl
);
8237 error ("non-local variable %qD declared %<__thread%> "
8238 "has a non-trivial destructor", decl
);
8239 static bool informed
;
8242 inform (DECL_SOURCE_LOCATION (decl
),
8243 "C++11 %<thread_local%> allows dynamic initialization "
8250 if (DECL_FUNCTION_SCOPE_P (decl
))
8252 /* Emit code to perform this initialization but once. */
8253 tree if_stmt
= NULL_TREE
, inner_if_stmt
= NULL_TREE
;
8254 tree then_clause
= NULL_TREE
, inner_then_clause
= NULL_TREE
;
8255 tree guard
, guard_addr
;
8257 /* We don't need thread-safety code for thread-local vars. */
8258 bool thread_guard
= (flag_threadsafe_statics
8259 && !CP_DECL_THREAD_LOCAL_P (decl
));
8261 /* Emit code to perform this initialization but once. This code
8264 static <type> guard;
8265 if (!__atomic_load (guard.first_byte)) {
8266 if (__cxa_guard_acquire (&guard)) {
8269 // Do initialization.
8270 flag = true; __cxa_guard_release (&guard);
8271 // Register variable for destruction at end of program.
8273 if (!flag) __cxa_guard_abort (&guard);
8278 Note that the `flag' variable is only set to 1 *after* the
8279 initialization is complete. This ensures that an exception,
8280 thrown during the construction, will cause the variable to
8281 reinitialized when we pass through this code again, as per:
8285 If the initialization exits by throwing an exception, the
8286 initialization is not complete, so it will be tried again
8287 the next time control enters the declaration.
8289 This process should be thread-safe, too; multiple threads
8290 should not be able to initialize the variable more than
8293 /* Create the guard variable. */
8294 guard
= get_guard (decl
);
8296 /* Begin the conditional initialization. */
8297 if_stmt
= begin_if_stmt ();
8299 finish_if_stmt_cond (get_guard_cond (guard
, thread_guard
), if_stmt
);
8300 then_clause
= begin_compound_stmt (BCS_NO_SCOPE
);
8304 tree vfntype
= NULL_TREE
;
8305 tree acquire_name
, release_name
, abort_name
;
8306 tree acquire_fn
, release_fn
, abort_fn
;
8307 guard_addr
= build_address (guard
);
8309 acquire_name
= get_identifier ("__cxa_guard_acquire");
8310 release_name
= get_identifier ("__cxa_guard_release");
8311 abort_name
= get_identifier ("__cxa_guard_abort");
8312 acquire_fn
= get_global_binding (acquire_name
);
8313 release_fn
= get_global_binding (release_name
);
8314 abort_fn
= get_global_binding (abort_name
);
8316 acquire_fn
= push_library_fn
8317 (acquire_name
, build_function_type_list (integer_type_node
,
8318 TREE_TYPE (guard_addr
),
8320 NULL_TREE
, ECF_NOTHROW
| ECF_LEAF
);
8321 if (!release_fn
|| !abort_fn
)
8322 vfntype
= build_function_type_list (void_type_node
,
8323 TREE_TYPE (guard_addr
),
8326 release_fn
= push_library_fn (release_name
, vfntype
, NULL_TREE
,
8327 ECF_NOTHROW
| ECF_LEAF
);
8329 abort_fn
= push_library_fn (abort_name
, vfntype
, NULL_TREE
,
8330 ECF_NOTHROW
| ECF_LEAF
);
8332 inner_if_stmt
= begin_if_stmt ();
8333 finish_if_stmt_cond (build_call_n (acquire_fn
, 1, guard_addr
),
8336 inner_then_clause
= begin_compound_stmt (BCS_NO_SCOPE
);
8337 begin
= get_target_expr (boolean_false_node
);
8338 flag
= TARGET_EXPR_SLOT (begin
);
8340 TARGET_EXPR_CLEANUP (begin
)
8341 = build3 (COND_EXPR
, void_type_node
, flag
,
8343 build_call_n (abort_fn
, 1, guard_addr
));
8344 CLEANUP_EH_ONLY (begin
) = 1;
8346 /* Do the initialization itself. */
8347 init
= add_stmt_to_compound (begin
, init
);
8348 init
= add_stmt_to_compound
8349 (init
, build2 (MODIFY_EXPR
, void_type_node
, flag
, boolean_true_node
));
8350 init
= add_stmt_to_compound
8351 (init
, build_call_n (release_fn
, 1, guard_addr
));
8354 init
= add_stmt_to_compound (init
, set_guard (guard
));
8356 /* Use atexit to register a function for destroying this static
8358 init
= add_stmt_to_compound (init
, register_dtor_fn (decl
));
8360 finish_expr_stmt (init
);
8364 finish_compound_stmt (inner_then_clause
);
8365 finish_then_clause (inner_if_stmt
);
8366 finish_if_stmt (inner_if_stmt
);
8369 finish_compound_stmt (then_clause
);
8370 finish_then_clause (if_stmt
);
8371 finish_if_stmt (if_stmt
);
8373 else if (CP_DECL_THREAD_LOCAL_P (decl
))
8374 tls_aggregates
= tree_cons (init
, decl
, tls_aggregates
);
8376 static_aggregates
= tree_cons (init
, decl
, static_aggregates
);
8380 /* Make TYPE a complete type based on INITIAL_VALUE.
8381 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
8382 2 if there was no information (in which case assume 0 if DO_DEFAULT),
8383 3 if the initializer list is empty (in pedantic mode). */
8386 cp_complete_array_type (tree
*ptype
, tree initial_value
, bool do_default
)
8389 tree type
, elt_type
;
8391 /* Don't get confused by a CONSTRUCTOR for some other type. */
8392 if (initial_value
&& TREE_CODE (initial_value
) == CONSTRUCTOR
8393 && !BRACE_ENCLOSED_INITIALIZER_P (initial_value
)
8394 && TREE_CODE (TREE_TYPE (initial_value
)) != ARRAY_TYPE
)
8399 unsigned HOST_WIDE_INT i
;
8402 /* An array of character type can be initialized from a
8403 brace-enclosed string constant.
8405 FIXME: this code is duplicated from reshape_init. Probably
8406 we should just call reshape_init here? */
8407 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype
)))
8408 && TREE_CODE (initial_value
) == CONSTRUCTOR
8409 && !vec_safe_is_empty (CONSTRUCTOR_ELTS (initial_value
)))
8411 vec
<constructor_elt
, va_gc
> *v
= CONSTRUCTOR_ELTS (initial_value
);
8412 tree value
= (*v
)[0].value
;
8414 if (TREE_CODE (value
) == STRING_CST
8415 && v
->length () == 1)
8416 initial_value
= value
;
8419 /* If any of the elements are parameter packs, we can't actually
8420 complete this type now because the array size is dependent. */
8421 if (TREE_CODE (initial_value
) == CONSTRUCTOR
)
8423 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value
),
8426 if (PACK_EXPANSION_P (value
))
8432 failure
= complete_array_type (ptype
, initial_value
, do_default
);
8434 /* We can create the array before the element type is complete, which
8435 means that we didn't have these two bits set in the original type
8436 either. In completing the type, we are expected to propagate these
8437 bits. See also complete_type which does the same thing for arrays
8440 if (type
!= error_mark_node
&& TYPE_DOMAIN (type
))
8442 elt_type
= TREE_TYPE (type
);
8443 TYPE_NEEDS_CONSTRUCTING (type
) = TYPE_NEEDS_CONSTRUCTING (elt_type
);
8444 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
)
8445 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type
);
8451 /* As above, but either give an error or reject zero-size arrays, depending
8455 cp_complete_array_type_or_error (tree
*ptype
, tree initial_value
,
8456 bool do_default
, tsubst_flags_t complain
)
8459 bool sfinae
= !(complain
& tf_error
);
8460 /* In SFINAE context we can't be lenient about zero-size arrays. */
8463 failure
= cp_complete_array_type (ptype
, initial_value
, do_default
);
8469 /* Not an error. */;
8470 else if (failure
== 1)
8471 error ("initializer fails to determine size of %qT", *ptype
);
8472 else if (failure
== 2)
8475 error ("array size missing in %qT", *ptype
);
8477 else if (failure
== 3)
8478 error ("zero-size array %qT", *ptype
);
8479 *ptype
= error_mark_node
;
8484 /* Return zero if something is declared to be a member of type
8485 CTYPE when in the context of CUR_TYPE. STRING is the error
8486 message to print in that case. Otherwise, quietly return 1. */
8489 member_function_or_else (tree ctype
, tree cur_type
, enum overload_flags flags
)
8491 if (ctype
&& ctype
!= cur_type
)
8493 if (flags
== DTOR_FLAG
)
8494 error ("destructor for alien class %qT cannot be a member", ctype
);
8496 error ("constructor for alien class %qT cannot be a member", ctype
);
8502 /* Subroutine of `grokdeclarator'. */
8504 /* Generate errors possibly applicable for a given set of specifiers.
8505 This is for ARM $7.1.2. */
8508 bad_specifiers (tree object
,
8509 enum bad_spec_place type
,
8515 const location_t
* locations
)
8521 error_at (locations
[ds_virtual
],
8522 "%qD declared as a %<virtual%> variable", object
);
8524 error ("%<const%> and %<volatile%> function specifiers on "
8525 "%qD invalid in variable declaration", object
);
8529 error_at (locations
[ds_virtual
],
8530 "%qD declared as a %<virtual%> parameter", object
);
8532 error_at (locations
[ds_inline
],
8533 "%qD declared as an %<inline%> parameter", object
);
8535 error ("%<const%> and %<volatile%> function specifiers on "
8536 "%qD invalid in parameter declaration", object
);
8540 error_at (locations
[ds_virtual
],
8541 "%qD declared as a %<virtual%> type", object
);
8543 error_at (locations
[ds_inline
],
8544 "%qD declared as an %<inline%> type", object
);
8546 error ("%<const%> and %<volatile%> function specifiers on "
8547 "%qD invalid in type declaration", object
);
8551 error_at (locations
[ds_virtual
],
8552 "%qD declared as a %<virtual%> field", object
);
8554 error_at (locations
[ds_inline
],
8555 "%qD declared as an %<inline%> field", object
);
8557 error ("%<const%> and %<volatile%> function specifiers on "
8558 "%qD invalid in field declaration", object
);
8564 error ("%q+D declared as a friend", object
);
8566 && !flag_noexcept_type
8567 && (TREE_CODE (object
) == TYPE_DECL
8568 || (!TYPE_PTRFN_P (TREE_TYPE (object
))
8569 && !TYPE_REFFN_P (TREE_TYPE (object
))
8570 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object
)))))
8571 error ("%q+D declared with an exception specification", object
);
8574 /* DECL is a member function or static data member and is presently
8575 being defined. Check that the definition is taking place in a
8579 check_class_member_definition_namespace (tree decl
)
8581 /* These checks only apply to member functions and static data
8583 gcc_assert (VAR_OR_FUNCTION_DECL_P (decl
));
8584 /* We check for problems with specializations in pt.c in
8585 check_specialization_namespace, where we can issue better
8587 if (processing_specialization
)
8589 /* We check this in check_explicit_instantiation_namespace. */
8590 if (processing_explicit_instantiation
)
8594 A member function definition that appears outside of the
8595 class definition shall appear in a namespace scope enclosing
8596 the class definition.
8600 The definition for a static data member shall appear in a
8601 namespace scope enclosing the member's class definition. */
8602 if (!is_ancestor (current_namespace
, DECL_CONTEXT (decl
)))
8603 permerror (input_location
, "definition of %qD is not in namespace enclosing %qT",
8604 decl
, DECL_CONTEXT (decl
));
8607 /* Build a PARM_DECL for the "this" parameter of FN. TYPE is the
8608 METHOD_TYPE for a non-static member function; QUALS are the
8609 cv-qualifiers that apply to the function. */
8612 build_this_parm (tree fn
, tree type
, cp_cv_quals quals
)
8617 cp_cv_quals this_quals
;
8619 if (CLASS_TYPE_P (type
))
8622 = cp_build_qualified_type (type
, quals
& ~TYPE_QUAL_RESTRICT
);
8623 this_type
= build_pointer_type (this_type
);
8626 this_type
= type_of_this_parm (type
);
8627 /* The `this' parameter is implicitly `const'; it cannot be
8629 this_quals
= (quals
& TYPE_QUAL_RESTRICT
) | TYPE_QUAL_CONST
;
8630 qual_type
= cp_build_qualified_type (this_type
, this_quals
);
8631 parm
= build_artificial_parm (fn
, this_identifier
, qual_type
);
8632 cp_apply_type_quals_to_decl (this_quals
, parm
);
8636 /* DECL is a static member function. Complain if it was declared
8637 with function-cv-quals. */
8640 check_static_quals (tree decl
, cp_cv_quals quals
)
8642 if (quals
!= TYPE_UNQUALIFIED
)
8643 error ("static member function %q#D declared with type qualifiers",
8647 // Check that FN takes no arguments and returns bool.
8649 check_concept_fn (tree fn
)
8651 // A constraint is nullary.
8652 if (DECL_ARGUMENTS (fn
))
8653 error_at (DECL_SOURCE_LOCATION (fn
),
8654 "concept %q#D declared with function parameters", fn
);
8656 // The declared return type of the concept shall be bool, and
8657 // it shall not be deduced from it definition.
8658 tree type
= TREE_TYPE (TREE_TYPE (fn
));
8660 error_at (DECL_SOURCE_LOCATION (fn
),
8661 "concept %q#D declared with a deduced return type", fn
);
8662 else if (type
!= boolean_type_node
)
8663 error_at (DECL_SOURCE_LOCATION (fn
),
8664 "concept %q#D with non-%<bool%> return type %qT", fn
, type
);
8667 /* Helper function. Replace the temporary this parameter injected
8668 during cp_finish_omp_declare_simd with the real this parameter. */
8671 declare_simd_adjust_this (tree
*tp
, int *walk_subtrees
, void *data
)
8673 tree this_parm
= (tree
) data
;
8674 if (TREE_CODE (*tp
) == PARM_DECL
8675 && DECL_NAME (*tp
) == this_identifier
8676 && *tp
!= this_parm
)
8678 else if (TYPE_P (*tp
))
8683 /* CTYPE is class type, or null if non-class.
8684 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
8686 DECLARATOR is the function's name.
8687 PARMS is a chain of PARM_DECLs for the function.
8688 VIRTUALP is truthvalue of whether the function is virtual or not.
8689 FLAGS are to be passed through to `grokclassfn'.
8690 QUALS are qualifiers indicating whether the function is `const'
8692 RAISES is a list of exceptions that this function can raise.
8693 CHECK is 1 if we must find this method in CTYPE, 0 if we should
8694 not look, and -1 if we should not call `grokclassfn' at all.
8696 SFK is the kind of special function (if any) for the new function.
8698 Returns `NULL_TREE' if something goes wrong, after issuing
8699 applicable error messages. */
8702 grokfndecl (tree ctype
,
8706 tree orig_declarator
,
8707 const cp_decl_specifier_seq
*declspecs
,
8710 enum overload_flags flags
,
8712 cp_ref_qualifier rqual
,
8719 special_function_kind sfk
,
8721 bool late_return_type_p
,
8725 location_t location
)
8728 int staticp
= ctype
&& TREE_CODE (type
) == FUNCTION_TYPE
;
8731 if (location
== UNKNOWN_LOCATION
)
8732 location
= input_location
;
8734 // Was the concept specifier present?
8735 bool concept_p
= inlinep
& 4;
8737 // Concept declarations must have a corresponding definition.
8738 if (concept_p
&& !funcdef_flag
)
8740 error_at (location
, "concept %qD has no definition", declarator
);
8744 type
= build_cp_fntype_variant (type
, rqual
, raises
, late_return_type_p
);
8746 decl
= build_lang_decl_loc (location
, FUNCTION_DECL
, declarator
, type
);
8748 /* Set the constraints on the declaration. */
8751 tree tmpl_reqs
= NULL_TREE
;
8752 if (processing_template_decl
> template_class_depth (ctype
))
8753 tmpl_reqs
= TEMPLATE_PARMS_CONSTRAINTS (current_template_parms
);
8755 /* Adjust the required expression into a constraint. */
8757 decl_reqs
= normalize_expression (decl_reqs
);
8759 tree ci
= build_constraints (tmpl_reqs
, decl_reqs
);
8760 set_constraints (decl
, ci
);
8763 if (TREE_CODE (type
) == METHOD_TYPE
)
8765 tree parm
= build_this_parm (decl
, type
, quals
);
8766 DECL_CHAIN (parm
) = parms
;
8769 /* Allocate space to hold the vptr bit if needed. */
8770 SET_DECL_ALIGN (decl
, MINIMUM_METHOD_BOUNDARY
);
8773 DECL_ARGUMENTS (decl
) = parms
;
8774 for (t
= parms
; t
; t
= DECL_CHAIN (t
))
8775 DECL_CONTEXT (t
) = decl
;
8777 /* Propagate volatile out from type to decl. */
8778 if (TYPE_VOLATILE (type
))
8779 TREE_THIS_VOLATILE (decl
) = 1;
8781 /* Setup decl according to sfk. */
8784 case sfk_constructor
:
8785 case sfk_copy_constructor
:
8786 case sfk_move_constructor
:
8787 DECL_CXX_CONSTRUCTOR_P (decl
) = 1;
8788 DECL_NAME (decl
) = ctor_identifier
;
8790 case sfk_destructor
:
8791 DECL_CXX_DESTRUCTOR_P (decl
) = 1;
8792 DECL_NAME (decl
) = dtor_identifier
;
8798 if (friendp
&& TREE_CODE (orig_declarator
) == TEMPLATE_ID_EXPR
)
8802 "defining explicit specialization %qD in friend declaration",
8806 tree fns
= TREE_OPERAND (orig_declarator
, 0);
8807 tree args
= TREE_OPERAND (orig_declarator
, 1);
8809 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
8811 /* Something like `template <class T> friend void f<T>()'. */
8813 "invalid use of template-id %qD in declaration "
8814 "of primary template",
8820 /* A friend declaration of the form friend void f<>(). Record
8821 the information in the TEMPLATE_ID_EXPR. */
8822 SET_DECL_IMPLICIT_INSTANTIATION (decl
);
8824 gcc_assert (identifier_p (fns
) || TREE_CODE (fns
) == OVERLOAD
);
8825 DECL_TEMPLATE_INFO (decl
) = build_template_info (fns
, args
);
8827 for (t
= TYPE_ARG_TYPES (TREE_TYPE (decl
)); t
; t
= TREE_CHAIN (t
))
8828 if (TREE_PURPOSE (t
)
8829 && TREE_CODE (TREE_PURPOSE (t
)) == DEFAULT_ARG
)
8831 error_at (defarg_location (TREE_PURPOSE (t
)),
8832 "default arguments are not allowed in declaration "
8833 "of friend template specialization %qD",
8840 error_at (declspecs
->locations
[ds_inline
],
8841 "%<inline%> is not allowed in declaration of friend "
8842 "template specialization %qD",
8849 /* C++17 11.3.6/4: "If a friend declaration specifies a default argument
8850 expression, that declaration shall be a definition..." */
8851 if (friendp
&& !funcdef_flag
)
8853 for (tree t
= FUNCTION_FIRST_USER_PARMTYPE (decl
);
8854 t
&& t
!= void_list_node
; t
= TREE_CHAIN (t
))
8855 if (TREE_PURPOSE (t
))
8857 permerror (DECL_SOURCE_LOCATION (decl
),
8858 "friend declaration of %qD specifies default "
8859 "arguments and isn't a definition", decl
);
8864 /* If this decl has namespace scope, set that up. */
8866 set_decl_namespace (decl
, in_namespace
, friendp
);
8868 DECL_CONTEXT (decl
) = FROB_CONTEXT (current_decl_namespace ());
8870 /* `main' and builtins have implicit 'C' linkage. */
8871 if (ctype
== NULL_TREE
8872 && DECL_FILE_SCOPE_P (decl
)
8873 && current_lang_name
== lang_name_cplusplus
8874 && (MAIN_NAME_P (declarator
)
8875 || (IDENTIFIER_LENGTH (declarator
) > 10
8876 && IDENTIFIER_POINTER (declarator
)[0] == '_'
8877 && IDENTIFIER_POINTER (declarator
)[1] == '_'
8878 && strncmp (IDENTIFIER_POINTER (declarator
)+2,
8879 "builtin_", 8) == 0)
8880 || (targetcm
.cxx_implicit_extern_c
8881 && (targetcm
.cxx_implicit_extern_c
8882 (IDENTIFIER_POINTER (declarator
))))))
8883 SET_DECL_LANGUAGE (decl
, lang_c
);
8885 /* Should probably propagate const out from type to decl I bet (mrs). */
8888 DECL_STATIC_FUNCTION_P (decl
) = 1;
8889 DECL_CONTEXT (decl
) = ctype
;
8893 DECL_DELETED_FN (decl
) = 1;
8897 DECL_CONTEXT (decl
) = ctype
;
8899 check_class_member_definition_namespace (decl
);
8902 if (ctype
== NULL_TREE
&& DECL_MAIN_P (decl
))
8904 if (PROCESSING_REAL_TEMPLATE_DECL_P())
8905 error_at (location
, "cannot declare %<::main%> to be a template");
8907 error_at (declspecs
->locations
[ds_inline
],
8908 "cannot declare %<::main%> to be inline");
8910 error_at (declspecs
->locations
[ds_constexpr
],
8911 "cannot declare %<::main%> to be %<constexpr%>");
8913 error_at (location
, "cannot declare %<::main%> to be static");
8918 /* Members of anonymous types and local classes have no linkage; make
8919 them internal. If a typedef is made later, this will be changed. */
8920 if (ctype
&& (!TREE_PUBLIC (TYPE_MAIN_DECL (ctype
))
8921 || decl_function_context (TYPE_MAIN_DECL (ctype
))))
8924 if (publicp
&& cxx_dialect
== cxx98
)
8926 /* [basic.link]: A name with no linkage (notably, the name of a class
8927 or enumeration declared in a local scope) shall not be used to
8928 declare an entity with linkage.
8930 DR 757 relaxes this restriction for C++0x. */
8931 no_linkage_error (decl
);
8934 TREE_PUBLIC (decl
) = publicp
;
8937 DECL_INTERFACE_KNOWN (decl
) = 1;
8938 DECL_NOT_REALLY_EXTERN (decl
) = 1;
8941 /* If the declaration was declared inline, mark it as such. */
8944 DECL_DECLARED_INLINE_P (decl
) = 1;
8946 DECL_COMDAT (decl
) = 1;
8949 DECL_DECLARED_CONSTEXPR_P (decl
) = true;
8951 // If the concept declaration specifier was found, check
8952 // that the declaration satisfies the necessary requirements.
8955 DECL_DECLARED_CONCEPT_P (decl
) = true;
8956 check_concept_fn (decl
);
8959 DECL_EXTERNAL (decl
) = 1;
8960 if (TREE_CODE (type
) == FUNCTION_TYPE
)
8963 TREE_TYPE (decl
) = apply_memfn_quals (TREE_TYPE (decl
),
8970 ? G_("static member function %qD cannot have cv-qualifier")
8971 : G_("non-member function %qD cannot have cv-qualifier"),
8973 quals
= TYPE_UNQUALIFIED
;
8979 ? G_("static member function %qD cannot have ref-qualifier")
8980 : G_("non-member function %qD cannot have ref-qualifier"),
8982 rqual
= REF_QUAL_NONE
;
8986 if (deduction_guide_p (decl
))
8988 if (!DECL_NAMESPACE_SCOPE_P (decl
))
8990 error_at (location
, "deduction guide %qD must be declared at "
8991 "namespace scope", decl
);
8996 "deduction guide %qD must not have a function body", decl
);
8998 else if (IDENTIFIER_ANY_OP_P (DECL_NAME (decl
))
8999 && !grok_op_properties (decl
, /*complain=*/true))
9001 else if (UDLIT_OPER_P (DECL_NAME (decl
)))
9003 bool long_long_unsigned_p
;
9005 const char *suffix
= NULL
;
9006 /* [over.literal]/6: Literal operators shall not have C linkage. */
9007 if (DECL_LANGUAGE (decl
) == lang_c
)
9009 error_at (location
, "literal operator with C linkage");
9010 maybe_show_extern_c_location ();
9014 if (DECL_NAMESPACE_SCOPE_P (decl
))
9016 if (!check_literal_operator_args (decl
, &long_long_unsigned_p
,
9019 error_at (location
, "%qD has invalid argument list", decl
);
9023 suffix
= UDLIT_OP_SUFFIX (DECL_NAME (decl
));
9024 if (long_long_unsigned_p
)
9026 if (cpp_interpret_int_suffix (parse_in
, suffix
, strlen (suffix
)))
9027 warning_at (location
, 0, "integer suffix %qs"
9028 " shadowed by implementation", suffix
);
9030 else if (long_double_p
)
9032 if (cpp_interpret_float_suffix (parse_in
, suffix
, strlen (suffix
)))
9033 warning_at (location
, 0, "floating point suffix %qs"
9034 " shadowed by implementation", suffix
);
9037 if (suffix
[0] != '_'
9038 && !in_system_header_at (location
)
9039 && !current_function_decl
&& !(friendp
&& !funcdef_flag
))
9040 warning_at (location
, OPT_Wliteral_suffix
,
9041 "literal operator suffixes not preceded by %<_%>"
9042 " are reserved for future standardization");
9046 error_at (location
, "%qD must be a non-member function", decl
);
9052 /* Make the init_value nonzero so pushdecl knows this is not
9053 tentative. error_mark_node is replaced later with the BLOCK. */
9054 DECL_INITIAL (decl
) = error_mark_node
;
9056 if (TYPE_NOTHROW_P (type
) || nothrow_libfn_p (decl
))
9057 TREE_NOTHROW (decl
) = 1;
9059 if (flag_openmp
|| flag_openmp_simd
)
9061 /* Adjust "omp declare simd" attributes. */
9062 tree ods
= lookup_attribute ("omp declare simd", *attrlist
);
9066 for (attr
= ods
; attr
;
9067 attr
= lookup_attribute ("omp declare simd", TREE_CHAIN (attr
)))
9069 if (TREE_CODE (type
) == METHOD_TYPE
)
9070 walk_tree (&TREE_VALUE (attr
), declare_simd_adjust_this
,
9071 DECL_ARGUMENTS (decl
), NULL
);
9072 if (TREE_VALUE (attr
) != NULL_TREE
)
9074 tree cl
= TREE_VALUE (TREE_VALUE (attr
));
9075 cl
= c_omp_declare_simd_clauses_to_numbers
9076 (DECL_ARGUMENTS (decl
), cl
);
9078 TREE_VALUE (TREE_VALUE (attr
)) = cl
;
9080 TREE_VALUE (attr
) = NULL_TREE
;
9086 /* Caller will do the rest of this. */
9090 if (ctype
!= NULL_TREE
)
9091 grokclassfn (ctype
, decl
, flags
);
9094 if (cxx_dialect
>= cxx11
9095 && DECL_DESTRUCTOR_P (decl
)
9096 && !TYPE_BEING_DEFINED (DECL_CONTEXT (decl
))
9097 && !processing_template_decl
)
9098 deduce_noexcept_on_destructor (decl
);
9100 decl
= check_explicit_specialization (orig_declarator
, decl
,
9103 4 * (friendp
!= 0) +
9106 if (decl
== error_mark_node
)
9109 if (DECL_STATIC_FUNCTION_P (decl
))
9110 check_static_quals (decl
, quals
);
9114 cplus_decl_attributes (&decl
, *attrlist
, 0);
9115 *attrlist
= NULL_TREE
;
9118 /* Check main's type after attributes have been applied. */
9119 if (ctype
== NULL_TREE
&& DECL_MAIN_P (decl
))
9121 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl
)),
9124 tree oldtypeargs
= TYPE_ARG_TYPES (TREE_TYPE (decl
));
9126 error_at (declspecs
->locations
[ds_type_spec
],
9127 "%<::main%> must return %<int%>");
9128 newtype
= build_function_type (integer_type_node
, oldtypeargs
);
9129 TREE_TYPE (decl
) = newtype
;
9132 check_main_parameter_types (decl
);
9135 if (ctype
!= NULL_TREE
&& check
)
9137 tree old_decl
= check_classfn (ctype
, decl
,
9138 (processing_template_decl
9139 > template_class_depth (ctype
))
9140 ? current_template_parms
9143 if (old_decl
== error_mark_node
)
9151 if (TREE_CODE (old_decl
) == TEMPLATE_DECL
)
9152 /* Because grokfndecl is always supposed to return a
9153 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
9154 here. We depend on our callers to figure out that its
9155 really a template that's being returned. */
9156 old_decl
= DECL_TEMPLATE_RESULT (old_decl
);
9158 if (DECL_STATIC_FUNCTION_P (old_decl
)
9159 && TREE_CODE (TREE_TYPE (decl
)) == METHOD_TYPE
)
9161 /* Remove the `this' parm added by grokclassfn. */
9162 revert_static_member_fn (decl
);
9163 check_static_quals (decl
, quals
);
9165 if (DECL_ARTIFICIAL (old_decl
))
9167 error ("definition of implicitly-declared %qD", old_decl
);
9170 else if (DECL_DEFAULTED_FN (old_decl
))
9172 error ("definition of explicitly-defaulted %q+D", decl
);
9173 inform (DECL_SOURCE_LOCATION (old_decl
),
9174 "%q#D explicitly defaulted here", old_decl
);
9178 /* Since we've smashed OLD_DECL to its
9179 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
9180 if (TREE_CODE (decl
) == TEMPLATE_DECL
)
9181 decl
= DECL_TEMPLATE_RESULT (decl
);
9183 /* Attempt to merge the declarations. This can fail, in
9184 the case of some invalid specialization declarations. */
9185 pushed_scope
= push_scope (ctype
);
9186 ok
= duplicate_decls (decl
, old_decl
, friendp
);
9188 pop_scope (pushed_scope
);
9191 error ("no %q#D member function declared in class %qT",
9195 if (ok
== error_mark_node
)
9201 if (DECL_CONSTRUCTOR_P (decl
) && !grok_ctor_properties (ctype
, decl
))
9204 if (ctype
== NULL_TREE
|| check
)
9208 DECL_VIRTUAL_P (decl
) = 1;
9213 /* decl is a FUNCTION_DECL.
9214 specifiers are the parsed virt-specifiers.
9216 Set flags to reflect the virt-specifiers.
9221 set_virt_specifiers (tree decl
, cp_virt_specifiers specifiers
)
9223 if (decl
== NULL_TREE
)
9225 if (specifiers
& VIRT_SPEC_OVERRIDE
)
9226 DECL_OVERRIDE_P (decl
) = 1;
9227 if (specifiers
& VIRT_SPEC_FINAL
)
9228 DECL_FINAL_P (decl
) = 1;
9232 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
9233 the linkage that DECL will receive in the object file. */
9236 set_linkage_for_static_data_member (tree decl
)
9238 /* A static data member always has static storage duration and
9239 external linkage. Note that static data members are forbidden in
9240 local classes -- the only situation in which a class has
9241 non-external linkage. */
9242 TREE_PUBLIC (decl
) = 1;
9243 TREE_STATIC (decl
) = 1;
9244 /* For non-template classes, static data members are always put
9245 out in exactly those files where they are defined, just as
9246 with ordinary namespace-scope variables. */
9247 if (!processing_template_decl
)
9248 DECL_INTERFACE_KNOWN (decl
) = 1;
9251 /* Create a VAR_DECL named NAME with the indicated TYPE.
9253 If SCOPE is non-NULL, it is the class type or namespace containing
9254 the variable. If SCOPE is NULL, the variable should is created in
9255 the innermost enclosing scope. */
9258 grokvardecl (tree type
,
9260 tree orig_declarator
,
9261 const cp_decl_specifier_seq
*declspecs
,
9270 tree explicit_scope
;
9272 gcc_assert (!name
|| identifier_p (name
));
9274 bool constp
= (type_quals
& TYPE_QUAL_CONST
) != 0;
9275 bool volatilep
= (type_quals
& TYPE_QUAL_VOLATILE
) != 0;
9277 /* Compute the scope in which to place the variable, but remember
9278 whether or not that scope was explicitly specified by the user. */
9279 explicit_scope
= scope
;
9282 /* An explicit "extern" specifier indicates a namespace-scope
9284 if (declspecs
->storage_class
== sc_extern
)
9285 scope
= current_decl_namespace ();
9286 else if (!at_function_scope_p ())
9287 scope
= current_scope ();
9291 && (/* If the variable is a namespace-scope variable declared in a
9292 template, we need DECL_LANG_SPECIFIC. */
9293 (TREE_CODE (scope
) == NAMESPACE_DECL
&& processing_template_decl
)
9294 /* Similarly for namespace-scope variables with language linkage
9296 || (TREE_CODE (scope
) == NAMESPACE_DECL
9297 && current_lang_name
!= lang_name_cplusplus
)
9298 /* Similarly for static data members. */
9300 /* Similarly for explicit specializations. */
9302 && TREE_CODE (orig_declarator
) == TEMPLATE_ID_EXPR
)))
9303 decl
= build_lang_decl (VAR_DECL
, name
, type
);
9305 decl
= build_decl (input_location
, VAR_DECL
, name
, type
);
9307 if (explicit_scope
&& TREE_CODE (explicit_scope
) == NAMESPACE_DECL
)
9308 set_decl_namespace (decl
, explicit_scope
, 0);
9310 DECL_CONTEXT (decl
) = FROB_CONTEXT (scope
);
9312 if (declspecs
->storage_class
== sc_extern
)
9314 DECL_THIS_EXTERN (decl
) = 1;
9315 DECL_EXTERNAL (decl
) = !initialized
;
9318 if (DECL_CLASS_SCOPE_P (decl
))
9320 set_linkage_for_static_data_member (decl
);
9321 /* This function is only called with out-of-class definitions. */
9322 DECL_EXTERNAL (decl
) = 0;
9323 check_class_member_definition_namespace (decl
);
9325 /* At top level, either `static' or no s.c. makes a definition
9326 (perhaps tentative), and absence of `static' makes it public. */
9327 else if (toplevel_bindings_p ())
9329 TREE_PUBLIC (decl
) = (declspecs
->storage_class
!= sc_static
9330 && (DECL_THIS_EXTERN (decl
)
9334 TREE_STATIC (decl
) = ! DECL_EXTERNAL (decl
);
9336 /* Not at top level, only `static' makes a static definition. */
9339 TREE_STATIC (decl
) = declspecs
->storage_class
== sc_static
;
9340 TREE_PUBLIC (decl
) = DECL_EXTERNAL (decl
);
9343 if (decl_spec_seq_has_spec_p (declspecs
, ds_thread
))
9345 if (DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
9347 CP_DECL_THREAD_LOCAL_P (decl
) = true;
9348 if (!processing_template_decl
)
9349 set_decl_tls_model (decl
, decl_default_tls_model (decl
));
9351 if (declspecs
->gnu_thread_keyword_p
)
9352 SET_DECL_GNU_TLS_P (decl
);
9355 /* If the type of the decl has no linkage, make sure that we'll
9356 notice that in mark_used. */
9357 if (cxx_dialect
> cxx98
9358 && decl_linkage (decl
) != lk_none
9359 && DECL_LANG_SPECIFIC (decl
) == NULL
9360 && !DECL_EXTERN_C_P (decl
)
9361 && no_linkage_check (TREE_TYPE (decl
), /*relaxed_p=*/false))
9362 retrofit_lang_decl (decl
);
9364 if (TREE_PUBLIC (decl
))
9366 /* [basic.link]: A name with no linkage (notably, the name of a class
9367 or enumeration declared in a local scope) shall not be used to
9368 declare an entity with linkage.
9370 DR 757 relaxes this restriction for C++0x. */
9371 if (cxx_dialect
< cxx11
)
9372 no_linkage_error (decl
);
9375 DECL_INTERFACE_KNOWN (decl
) = 1;
9377 if (DECL_NAME (decl
)
9378 && MAIN_NAME_P (DECL_NAME (decl
))
9379 && scope
== global_namespace
)
9380 error ("cannot declare %<::main%> to be a global variable");
9382 /* Check that the variable can be safely declared as a concept.
9383 Note that this also forbids explicit specializations. */
9386 if (!processing_template_decl
)
9388 error_at (declspecs
->locations
[ds_concept
],
9389 "a non-template variable cannot be %<concept%>");
9393 DECL_DECLARED_CONCEPT_P (decl
) = true;
9394 if (!same_type_ignoring_top_level_qualifiers_p (type
, boolean_type_node
))
9395 error_at (declspecs
->locations
[ds_type_spec
],
9396 "concept must have type %<bool%>");
9398 else if (flag_concepts
9399 && processing_template_decl
> template_class_depth (scope
))
9401 tree reqs
= TEMPLATE_PARMS_CONSTRAINTS (current_template_parms
);
9402 tree ci
= build_constraints (reqs
, NULL_TREE
);
9403 set_constraints (decl
, ci
);
9406 // Handle explicit specializations and instantiations of variable templates.
9407 if (orig_declarator
)
9408 decl
= check_explicit_specialization (orig_declarator
, decl
,
9409 template_count
, conceptp
* 8);
9411 return decl
!= error_mark_node
? decl
: NULL_TREE
;
9414 /* Create and return a canonical pointer to member function type, for
9415 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
9418 build_ptrmemfunc_type (tree type
)
9423 if (type
== error_mark_node
)
9426 /* Make sure that we always have the unqualified pointer-to-member
9428 if (cp_cv_quals quals
= cp_type_quals (type
))
9430 tree unqual
= build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type
));
9431 return cp_build_qualified_type (unqual
, quals
);
9434 /* If a canonical type already exists for this type, use it. We use
9435 this method instead of type_hash_canon, because it only does a
9436 simple equality check on the list of field members. */
9438 t
= TYPE_PTRMEMFUNC_TYPE (type
);
9442 t
= make_node (RECORD_TYPE
);
9444 /* Let the front end know this is a pointer to member function. */
9445 TYPE_PTRMEMFUNC_FLAG (t
) = 1;
9447 field
= build_decl (input_location
, FIELD_DECL
, pfn_identifier
, type
);
9450 field
= build_decl (input_location
, FIELD_DECL
, delta_identifier
,
9452 DECL_CHAIN (field
) = fields
;
9455 finish_builtin_struct (t
, "__ptrmemfunc_type", fields
, ptr_type_node
);
9457 /* Zap out the name so that the back end will give us the debugging
9458 information for this anonymous RECORD_TYPE. */
9459 TYPE_NAME (t
) = NULL_TREE
;
9461 /* Cache this pointer-to-member type so that we can find it again
9463 TYPE_PTRMEMFUNC_TYPE (type
) = t
;
9465 if (TYPE_STRUCTURAL_EQUALITY_P (type
))
9466 SET_TYPE_STRUCTURAL_EQUALITY (t
);
9467 else if (TYPE_CANONICAL (type
) != type
)
9468 TYPE_CANONICAL (t
) = build_ptrmemfunc_type (TYPE_CANONICAL (type
));
9473 /* Create and return a pointer to data member type. */
9476 build_ptrmem_type (tree class_type
, tree member_type
)
9478 if (TREE_CODE (member_type
) == METHOD_TYPE
)
9480 cp_cv_quals quals
= type_memfn_quals (member_type
);
9481 cp_ref_qualifier rqual
= type_memfn_rqual (member_type
);
9482 member_type
= build_memfn_type (member_type
, class_type
, quals
, rqual
);
9483 return build_ptrmemfunc_type (build_pointer_type (member_type
));
9487 gcc_assert (TREE_CODE (member_type
) != FUNCTION_TYPE
);
9488 return build_offset_type (class_type
, member_type
);
9492 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
9493 Check to see that the definition is valid. Issue appropriate error
9497 check_static_variable_definition (tree decl
, tree type
)
9499 /* Avoid redundant diagnostics on out-of-class definitions. */
9500 if (!current_class_type
|| !TYPE_BEING_DEFINED (current_class_type
))
9502 /* Can't check yet if we don't know the type. */
9503 else if (dependent_type_p (type
))
9505 /* If DECL is declared constexpr, we'll do the appropriate checks
9506 in check_initializer. Similarly for inline static data members. */
9507 else if (DECL_P (decl
)
9508 && (DECL_DECLARED_CONSTEXPR_P (decl
)
9509 || undeduced_auto_decl (decl
)
9510 || DECL_VAR_DECLARED_INLINE_P (decl
)))
9512 else if (cxx_dialect
>= cxx11
&& !INTEGRAL_OR_ENUMERATION_TYPE_P (type
))
9514 if (!COMPLETE_TYPE_P (type
))
9515 error_at (DECL_SOURCE_LOCATION (decl
),
9516 "in-class initialization of static data member %q#D of "
9517 "incomplete type", decl
);
9518 else if (literal_type_p (type
))
9519 permerror (DECL_SOURCE_LOCATION (decl
),
9520 "%<constexpr%> needed for in-class initialization of "
9521 "static data member %q#D of non-integral type", decl
);
9523 error_at (DECL_SOURCE_LOCATION (decl
),
9524 "in-class initialization of static data member %q#D of "
9525 "non-literal type", decl
);
9527 /* Motion 10 at San Diego: If a static const integral data member is
9528 initialized with an integral constant expression, the initializer
9529 may appear either in the declaration (within the class), or in
9530 the definition, but not both. If it appears in the class, the
9531 member is a member constant. The file-scope definition is always
9533 else if (!ARITHMETIC_TYPE_P (type
) && TREE_CODE (type
) != ENUMERAL_TYPE
)
9534 error_at (DECL_SOURCE_LOCATION (decl
),
9535 "invalid in-class initialization of static data member "
9536 "of non-integral type %qT",
9538 else if (!CP_TYPE_CONST_P (type
))
9539 error_at (DECL_SOURCE_LOCATION (decl
),
9540 "ISO C++ forbids in-class initialization of non-const "
9541 "static member %qD",
9543 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type
))
9544 pedwarn (DECL_SOURCE_LOCATION (decl
), OPT_Wpedantic
,
9545 "ISO C++ forbids initialization of member constant "
9546 "%qD of non-integral type %qT", decl
, type
);
9549 /* *expr_p is part of the TYPE_SIZE of a variably-sized array. If any
9550 SAVE_EXPRs in *expr_p wrap expressions with side-effects, break those
9551 expressions out into temporary variables so that walk_tree doesn't
9552 step into them (c++/15764). */
9555 stabilize_save_expr_r (tree
*expr_p
, int *walk_subtrees
, void *data
)
9557 hash_set
<tree
> *pset
= (hash_set
<tree
> *)data
;
9558 tree expr
= *expr_p
;
9559 if (TREE_CODE (expr
) == SAVE_EXPR
)
9561 tree op
= TREE_OPERAND (expr
, 0);
9562 cp_walk_tree (&op
, stabilize_save_expr_r
, data
, pset
);
9563 if (TREE_SIDE_EFFECTS (op
))
9564 TREE_OPERAND (expr
, 0) = get_temp_regvar (TREE_TYPE (op
), op
);
9567 else if (!EXPR_P (expr
) || !TREE_SIDE_EFFECTS (expr
))
9572 /* Entry point for the above. */
9575 stabilize_vla_size (tree size
)
9577 hash_set
<tree
> pset
;
9578 /* Break out any function calls into temporary variables. */
9579 cp_walk_tree (&size
, stabilize_save_expr_r
, &pset
, &pset
);
9582 /* Reduce a SIZEOF_EXPR to its value. */
9585 fold_sizeof_expr (tree t
)
9588 if (SIZEOF_EXPR_TYPE_P (t
))
9589 r
= cxx_sizeof_or_alignof_type (TREE_TYPE (TREE_OPERAND (t
, 0)),
9590 SIZEOF_EXPR
, false, false);
9591 else if (TYPE_P (TREE_OPERAND (t
, 0)))
9592 r
= cxx_sizeof_or_alignof_type (TREE_OPERAND (t
, 0), SIZEOF_EXPR
,
9595 r
= cxx_sizeof_or_alignof_expr (TREE_OPERAND (t
, 0), SIZEOF_EXPR
,
9597 if (r
== error_mark_node
)
9602 /* Given the SIZE (i.e., number of elements) in an array, compute
9603 an appropriate index type for the array. If non-NULL, NAME is
9604 the name of the entity being declared. */
9607 compute_array_index_type (tree name
, tree size
, tsubst_flags_t complain
)
9612 if (error_operand_p (size
))
9613 return error_mark_node
;
9615 if (!type_dependent_expression_p (size
))
9617 osize
= size
= mark_rvalue_use (size
);
9619 if (cxx_dialect
< cxx11
&& TREE_CODE (size
) == NOP_EXPR
9620 && TREE_SIDE_EFFECTS (size
))
9621 /* In C++98, we mark a non-constant array bound with a magic
9622 NOP_EXPR with TREE_SIDE_EFFECTS; don't fold in that case. */;
9625 size
= instantiate_non_dependent_expr_sfinae (size
, complain
);
9626 size
= build_converted_constant_expr (size_type_node
, size
, complain
);
9627 size
= maybe_constant_value (size
);
9629 if (!TREE_CONSTANT (size
))
9633 if (error_operand_p (size
))
9634 return error_mark_node
;
9636 /* The array bound must be an integer type. */
9637 tree type
= TREE_TYPE (size
);
9638 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type
))
9640 if (!(complain
& tf_error
))
9641 return error_mark_node
;
9643 error ("size of array %qD has non-integral type %qT", name
, type
);
9645 error ("size of array has non-integral type %qT", type
);
9646 size
= integer_one_node
;
9650 /* A type is dependent if it is...an array type constructed from any
9651 dependent type or whose size is specified by a constant expression
9652 that is value-dependent. */
9653 /* We can only call value_dependent_expression_p on integral constant
9654 expressions; treat non-constant expressions as dependent, too. */
9655 if (processing_template_decl
9656 && (type_dependent_expression_p (size
)
9657 || !TREE_CONSTANT (size
) || value_dependent_expression_p (size
)))
9659 /* We cannot do any checking for a SIZE that isn't known to be
9660 constant. Just build the index type and mark that it requires
9661 structural equality checks. */
9662 itype
= build_index_type (build_min (MINUS_EXPR
, sizetype
,
9663 size
, size_one_node
));
9664 TYPE_DEPENDENT_P (itype
) = 1;
9665 TYPE_DEPENDENT_P_VALID (itype
) = 1;
9666 SET_TYPE_STRUCTURAL_EQUALITY (itype
);
9670 if (TREE_CODE (size
) != INTEGER_CST
)
9672 tree folded
= cp_fully_fold (size
);
9673 if (TREE_CODE (folded
) == INTEGER_CST
)
9674 pedwarn (input_location
, OPT_Wpedantic
,
9675 "size of array is not an integral constant-expression");
9676 /* Use the folded result for VLAs, too; it will have resolved
9681 /* Normally, the array-bound will be a constant. */
9682 if (TREE_CODE (size
) == INTEGER_CST
)
9684 /* An array must have a positive number of elements. */
9685 if (!valid_constant_size_p (size
))
9687 if (!(complain
& tf_error
))
9688 return error_mark_node
;
9691 error ("size of array %qD is negative", name
);
9693 error ("size of array is negative");
9694 size
= integer_one_node
;
9696 /* As an extension we allow zero-sized arrays. */
9697 else if (integer_zerop (size
))
9699 if (!(complain
& tf_error
))
9700 /* We must fail if performing argument deduction (as
9701 indicated by the state of complain), so that
9702 another substitution can be found. */
9703 return error_mark_node
;
9704 else if (in_system_header_at (input_location
))
9705 /* Allow them in system headers because glibc uses them. */;
9707 pedwarn (input_location
, OPT_Wpedantic
, "ISO C++ forbids zero-size array %qD", name
);
9709 pedwarn (input_location
, OPT_Wpedantic
, "ISO C++ forbids zero-size array");
9712 else if (TREE_CONSTANT (size
)
9713 /* We don't allow VLAs at non-function scopes, or during
9714 tentative template substitution. */
9715 || !at_function_scope_p ()
9716 || !(complain
& tf_error
))
9718 if (!(complain
& tf_error
))
9719 return error_mark_node
;
9720 /* `(int) &fn' is not a valid array bound. */
9722 error ("size of array %qD is not an integral constant-expression",
9725 error ("size of array is not an integral constant-expression");
9726 size
= integer_one_node
;
9728 else if (pedantic
&& warn_vla
!= 0)
9731 pedwarn (input_location
, OPT_Wvla
, "ISO C++ forbids variable length array %qD", name
);
9733 pedwarn (input_location
, OPT_Wvla
, "ISO C++ forbids variable length array");
9735 else if (warn_vla
> 0)
9739 "variable length array %qD is used", name
);
9742 "variable length array is used");
9745 if (processing_template_decl
&& !TREE_CONSTANT (size
))
9746 /* A variable sized array. */
9747 itype
= build_min (MINUS_EXPR
, sizetype
, size
, integer_one_node
);
9750 /* Compute the index of the largest element in the array. It is
9751 one less than the number of elements in the array. We save
9752 and restore PROCESSING_TEMPLATE_DECL so that computations in
9753 cp_build_binary_op will be appropriately folded. */
9755 processing_template_decl_sentinel s
;
9756 itype
= cp_build_binary_op (input_location
,
9758 cp_convert (ssizetype
, size
, complain
),
9759 cp_convert (ssizetype
, integer_one_node
,
9762 itype
= maybe_constant_value (itype
);
9765 if (!TREE_CONSTANT (itype
))
9767 /* A variable sized array. */
9768 itype
= variable_size (itype
);
9770 stabilize_vla_size (itype
);
9772 if (sanitize_flags_p (SANITIZE_VLA
)
9773 && current_function_decl
!= NULL_TREE
)
9775 /* We have to add 1 -- in the ubsan routine we generate
9776 LE_EXPR rather than LT_EXPR. */
9777 tree t
= fold_build2 (PLUS_EXPR
, TREE_TYPE (itype
), itype
,
9778 build_one_cst (TREE_TYPE (itype
)));
9779 t
= ubsan_instrument_vla (input_location
, t
);
9780 finish_expr_stmt (t
);
9783 /* Make sure that there was no overflow when creating to a signed
9784 index type. (For example, on a 32-bit machine, an array with
9785 size 2^32 - 1 is too big.) */
9786 else if (TREE_CODE (itype
) == INTEGER_CST
9787 && TREE_OVERFLOW (itype
))
9789 if (!(complain
& tf_error
))
9790 return error_mark_node
;
9791 error ("overflow in array dimension");
9792 TREE_OVERFLOW (itype
) = 0;
9796 /* Create and return the appropriate index type. */
9797 itype
= build_index_type (itype
);
9799 /* If the index type were dependent, we would have returned early, so
9800 remember that it isn't. */
9801 TYPE_DEPENDENT_P (itype
) = 0;
9802 TYPE_DEPENDENT_P_VALID (itype
) = 1;
9806 /* Returns the scope (if any) in which the entity declared by
9807 DECLARATOR will be located. If the entity was declared with an
9808 unqualified name, NULL_TREE is returned. */
9811 get_scope_of_declarator (const cp_declarator
*declarator
)
9813 while (declarator
&& declarator
->kind
!= cdk_id
)
9814 declarator
= declarator
->declarator
;
9816 /* If the declarator-id is a SCOPE_REF, the scope in which the
9817 declaration occurs is the first operand. */
9819 && declarator
->u
.id
.qualifying_scope
)
9820 return declarator
->u
.id
.qualifying_scope
;
9822 /* Otherwise, the declarator is not a qualified name; the entity will
9823 be declared in the current scope. */
9827 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
9828 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
9832 create_array_type_for_decl (tree name
, tree type
, tree size
)
9834 tree itype
= NULL_TREE
;
9836 /* If things have already gone awry, bail now. */
9837 if (type
== error_mark_node
|| size
== error_mark_node
)
9838 return error_mark_node
;
9840 /* 8.3.4/1: If the type of the identifier of D contains the auto
9841 type-specifier, the program is ill-formed. */
9842 if (type_uses_auto (type
))
9845 error ("%qD declared as array of %qT", name
, type
);
9847 error ("creating array of %qT", type
);
9848 return error_mark_node
;
9851 /* If there are some types which cannot be array elements,
9852 issue an error-message and return. */
9853 switch (TREE_CODE (type
))
9857 error ("declaration of %qD as array of void", name
);
9859 error ("creating array of void");
9860 return error_mark_node
;
9864 error ("declaration of %qD as array of functions", name
);
9866 error ("creating array of functions");
9867 return error_mark_node
;
9869 case REFERENCE_TYPE
:
9871 error ("declaration of %qD as array of references", name
);
9873 error ("creating array of references");
9874 return error_mark_node
;
9878 error ("declaration of %qD as array of function members", name
);
9880 error ("creating array of function members");
9881 return error_mark_node
;
9889 The constant expressions that specify the bounds of the arrays
9890 can be omitted only for the first member of the sequence. */
9891 if (TREE_CODE (type
) == ARRAY_TYPE
&& !TYPE_DOMAIN (type
))
9894 error ("declaration of %qD as multidimensional array must "
9895 "have bounds for all dimensions except the first",
9898 error ("multidimensional array must have bounds for all "
9899 "dimensions except the first");
9901 return error_mark_node
;
9904 /* Figure out the index type for the array. */
9906 itype
= compute_array_index_type (name
, size
, tf_warning_or_error
);
9909 T is called the array element type; this type shall not be [...] an
9910 abstract class type. */
9911 abstract_virtuals_error (name
, type
);
9913 return build_cplus_array_type (type
, itype
);
9916 /* Returns the smallest location that is not UNKNOWN_LOCATION. */
9919 min_location (location_t loca
, location_t locb
)
9921 if (loca
== UNKNOWN_LOCATION
9922 || (locb
!= UNKNOWN_LOCATION
9923 && linemap_location_before_p (line_table
, locb
, loca
)))
9928 /* Returns the smallest location != UNKNOWN_LOCATION among the
9929 three stored in LOCATIONS[ds_const], LOCATIONS[ds_volatile],
9930 and LOCATIONS[ds_restrict]. */
9933 smallest_type_quals_location (int type_quals
, const location_t
* locations
)
9935 location_t loc
= UNKNOWN_LOCATION
;
9937 if (type_quals
& TYPE_QUAL_CONST
)
9938 loc
= locations
[ds_const
];
9940 if (type_quals
& TYPE_QUAL_VOLATILE
)
9941 loc
= min_location (loc
, locations
[ds_volatile
]);
9943 if (type_quals
& TYPE_QUAL_RESTRICT
)
9944 loc
= min_location (loc
, locations
[ds_restrict
]);
9949 /* Check that it's OK to declare a function with the indicated TYPE
9950 and TYPE_QUALS. SFK indicates the kind of special function (if any)
9951 that this function is. OPTYPE is the type given in a conversion
9952 operator declaration, or the class type for a constructor/destructor.
9953 Returns the actual return type of the function; that may be different
9954 than TYPE if an error occurs, or for certain special functions. */
9957 check_special_function_return_type (special_function_kind sfk
,
9961 const location_t
* locations
)
9965 case sfk_constructor
:
9967 error ("return type specification for constructor invalid");
9968 else if (type_quals
!= TYPE_UNQUALIFIED
)
9969 error_at (smallest_type_quals_location (type_quals
, locations
),
9970 "qualifiers are not allowed on constructor declaration");
9972 if (targetm
.cxx
.cdtor_returns_this ())
9973 type
= build_pointer_type (optype
);
9975 type
= void_type_node
;
9978 case sfk_destructor
:
9980 error ("return type specification for destructor invalid");
9981 else if (type_quals
!= TYPE_UNQUALIFIED
)
9982 error_at (smallest_type_quals_location (type_quals
, locations
),
9983 "qualifiers are not allowed on destructor declaration");
9985 /* We can't use the proper return type here because we run into
9986 problems with ambiguous bases and covariant returns. */
9987 if (targetm
.cxx
.cdtor_returns_this ())
9988 type
= build_pointer_type (void_type_node
);
9990 type
= void_type_node
;
9993 case sfk_conversion
:
9995 error ("return type specified for %<operator %T%>", optype
);
9996 else if (type_quals
!= TYPE_UNQUALIFIED
)
9997 error_at (smallest_type_quals_location (type_quals
, locations
),
9998 "qualifiers are not allowed on declaration of "
9999 "%<operator %T%>", optype
);
10004 case sfk_deduction_guide
:
10006 error ("return type specified for deduction guide");
10007 else if (type_quals
!= TYPE_UNQUALIFIED
)
10008 error_at (smallest_type_quals_location (type_quals
, locations
),
10009 "qualifiers are not allowed on declaration of "
10010 "deduction guide");
10011 if (TREE_CODE (optype
) == TEMPLATE_TEMPLATE_PARM
)
10013 error ("template template parameter %qT in declaration of "
10014 "deduction guide", optype
);
10015 type
= error_mark_node
;
10018 type
= make_template_placeholder (CLASSTYPE_TI_TEMPLATE (optype
));
10019 for (int i
= 0; i
< ds_last
; ++i
)
10020 if (i
!= ds_explicit
&& locations
[i
])
10021 error_at (locations
[i
],
10022 "decl-specifier in declaration of deduction guide");
10026 gcc_unreachable ();
10032 /* A variable or data member (whose unqualified name is IDENTIFIER)
10033 has been declared with the indicated TYPE. If the TYPE is not
10034 acceptable, issue an error message and return a type to use for
10035 error-recovery purposes. */
10038 check_var_type (tree identifier
, tree type
)
10040 if (VOID_TYPE_P (type
))
10043 error ("unnamed variable or field declared void");
10044 else if (identifier_p (identifier
))
10046 gcc_assert (!IDENTIFIER_ANY_OP_P (identifier
));
10047 error ("variable or field %qE declared void", identifier
);
10050 error ("variable or field declared void");
10051 type
= error_mark_node
;
10057 /* Handle declaring DECL as an inline variable. */
10060 mark_inline_variable (tree decl
, location_t loc
)
10062 bool inlinep
= true;
10063 if (! toplevel_bindings_p ())
10065 error_at (loc
, "%<inline%> specifier invalid for variable "
10066 "%qD declared at block scope", decl
);
10069 else if (cxx_dialect
< cxx17
)
10070 pedwarn (loc
, 0, "inline variables are only available "
10071 "with -std=c++17 or -std=gnu++17");
10074 retrofit_lang_decl (decl
);
10075 SET_DECL_VAR_DECLARED_INLINE_P (decl
);
10080 /* Assign a typedef-given name to a class or enumeration type declared
10081 as anonymous at first. This was split out of grokdeclarator
10082 because it is also used in libcc1. */
10085 name_unnamed_type (tree type
, tree decl
)
10087 gcc_assert (TYPE_UNNAMED_P (type
));
10089 /* Replace the anonymous name with the real name everywhere. */
10090 for (tree t
= TYPE_MAIN_VARIANT (type
); t
; t
= TYPE_NEXT_VARIANT (t
))
10092 if (anon_aggrname_p (TYPE_IDENTIFIER (t
)))
10093 /* We do not rename the debug info representing the
10094 unnamed tagged type because the standard says in
10095 [dcl.typedef] that the naming applies only for
10096 linkage purposes. */
10097 /*debug_hooks->set_name (t, decl);*/
10098 TYPE_NAME (t
) = decl
;
10101 if (TYPE_LANG_SPECIFIC (type
))
10102 TYPE_WAS_UNNAMED (type
) = 1;
10104 /* If this is a typedef within a template class, the nested
10105 type is a (non-primary) template. The name for the
10106 template needs updating as well. */
10107 if (TYPE_LANG_SPECIFIC (type
) && CLASSTYPE_TEMPLATE_INFO (type
))
10108 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type
))
10109 = TYPE_IDENTIFIER (type
);
10111 /* Adjust linkage now that we aren't unnamed anymore. */
10112 reset_type_linkage (type
);
10114 /* FIXME remangle member functions; member functions of a
10115 type with external linkage have external linkage. */
10117 /* Check that our job is done, and that it would fail if we
10118 attempted to do it again. */
10119 gcc_assert (!TYPE_UNNAMED_P (type
));
10122 /* Given declspecs and a declarator (abstract or otherwise), determine
10123 the name and type of the object declared and construct a DECL node
10126 DECLSPECS points to the representation of declaration-specifier
10127 sequence that precedes declarator.
10129 DECL_CONTEXT says which syntactic context this declaration is in:
10130 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
10131 FUNCDEF for a function definition. Like NORMAL but a few different
10132 error messages in each case. Return value may be zero meaning
10133 this definition is too screwy to try to parse.
10134 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
10135 handle member functions (which have FIELD context).
10136 Return value may be zero meaning this definition is too screwy to
10138 PARM for a parameter declaration (either within a function prototype
10139 or before a function body). Make a PARM_DECL, or return void_type_node.
10140 TPARM for a template parameter declaration.
10141 CATCHPARM for a parameter declaration before a catch clause.
10142 TYPENAME if for a typename (in a cast or sizeof).
10143 Don't make a DECL node; just return the ..._TYPE node.
10144 FIELD for a struct or union field; make a FIELD_DECL.
10145 BITFIELD for a field with specified width.
10147 INITIALIZED is as for start_decl.
10149 ATTRLIST is a pointer to the list of attributes, which may be NULL
10150 if there are none; *ATTRLIST may be modified if attributes from inside
10151 the declarator should be applied to the declaration.
10153 When this function is called, scoping variables (such as
10154 CURRENT_CLASS_TYPE) should reflect the scope in which the
10155 declaration occurs, not the scope in which the new declaration will
10156 be placed. For example, on:
10158 void S::f() { ... }
10160 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
10163 Returns a DECL (if a declarator is present), a TYPE (if there is no
10164 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
10168 grokdeclarator (const cp_declarator
*declarator
,
10169 cp_decl_specifier_seq
*declspecs
,
10170 enum decl_context decl_context
,
10174 tree type
= NULL_TREE
;
10176 int explicit_intN
= 0;
10177 int virtualp
, explicitp
, friendp
, inlinep
, staticp
;
10178 int explicit_int
= 0;
10179 int explicit_char
= 0;
10180 int defaulted_int
= 0;
10182 tree typedef_decl
= NULL_TREE
;
10183 const char *name
= NULL
;
10184 tree typedef_type
= NULL_TREE
;
10185 /* True if this declarator is a function definition. */
10186 bool funcdef_flag
= false;
10187 cp_declarator_kind innermost_code
= cdk_error
;
10190 /* See the code below that used this. */
10191 tree decl_attr
= NULL_TREE
;
10194 /* Keep track of what sort of function is being processed
10195 so that we can warn about default return values, or explicit
10196 return values which do not match prescribed defaults. */
10197 special_function_kind sfk
= sfk_none
;
10199 tree dname
= NULL_TREE
;
10200 tree ctor_return_type
= NULL_TREE
;
10201 enum overload_flags flags
= NO_SPECIAL
;
10202 /* cv-qualifiers that apply to the declarator, for a declaration of
10203 a member function. */
10204 cp_cv_quals memfn_quals
= TYPE_UNQUALIFIED
;
10205 /* virt-specifiers that apply to the declarator, for a declaration of
10206 a member function. */
10207 cp_virt_specifiers virt_specifiers
= VIRT_SPEC_UNSPECIFIED
;
10208 /* ref-qualifier that applies to the declarator, for a declaration of
10209 a member function. */
10210 cp_ref_qualifier rqual
= REF_QUAL_NONE
;
10211 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
10212 int type_quals
= TYPE_UNQUALIFIED
;
10213 tree raises
= NULL_TREE
;
10214 int template_count
= 0;
10215 tree returned_attrs
= NULL_TREE
;
10216 tree parms
= NULL_TREE
;
10217 const cp_declarator
*id_declarator
;
10218 /* The unqualified name of the declarator; either an
10219 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
10220 tree unqualified_id
;
10221 /* The class type, if any, in which this entity is located,
10222 or NULL_TREE if none. Note that this value may be different from
10223 the current class type; for example if an attempt is made to declare
10224 "A::f" inside "B", this value will be "A". */
10225 tree ctype
= current_class_type
;
10226 /* The NAMESPACE_DECL for the namespace in which this entity is
10227 located. If an unqualified name is used to declare the entity,
10228 this value will be NULL_TREE, even if the entity is located at
10229 namespace scope. */
10230 tree in_namespace
= NULL_TREE
;
10231 cp_storage_class storage_class
;
10232 bool unsigned_p
, signed_p
, short_p
, long_p
, thread_p
;
10233 bool type_was_error_mark_node
= false;
10234 bool parameter_pack_p
= declarator
? declarator
->parameter_pack_p
: false;
10235 bool template_type_arg
= false;
10236 bool template_parm_flag
= false;
10237 bool typedef_p
= decl_spec_seq_has_spec_p (declspecs
, ds_typedef
);
10238 bool constexpr_p
= decl_spec_seq_has_spec_p (declspecs
, ds_constexpr
);
10239 bool late_return_type_p
= false;
10240 bool array_parameter_p
= false;
10241 source_location saved_loc
= input_location
;
10242 tree reqs
= NULL_TREE
;
10244 signed_p
= decl_spec_seq_has_spec_p (declspecs
, ds_signed
);
10245 unsigned_p
= decl_spec_seq_has_spec_p (declspecs
, ds_unsigned
);
10246 short_p
= decl_spec_seq_has_spec_p (declspecs
, ds_short
);
10247 long_p
= decl_spec_seq_has_spec_p (declspecs
, ds_long
);
10248 longlong
= decl_spec_seq_has_spec_p (declspecs
, ds_long_long
);
10249 explicit_intN
= declspecs
->explicit_intN_p
;
10250 thread_p
= decl_spec_seq_has_spec_p (declspecs
, ds_thread
);
10252 // Was concept_p specified? Note that ds_concept
10253 // implies ds_constexpr!
10254 bool concept_p
= decl_spec_seq_has_spec_p (declspecs
, ds_concept
);
10256 constexpr_p
= true;
10258 if (decl_spec_seq_has_spec_p (declspecs
, ds_const
))
10259 type_quals
|= TYPE_QUAL_CONST
;
10260 if (decl_spec_seq_has_spec_p (declspecs
, ds_volatile
))
10261 type_quals
|= TYPE_QUAL_VOLATILE
;
10262 if (decl_spec_seq_has_spec_p (declspecs
, ds_restrict
))
10263 type_quals
|= TYPE_QUAL_RESTRICT
;
10265 if (decl_context
== FUNCDEF
)
10266 funcdef_flag
= true, decl_context
= NORMAL
;
10267 else if (decl_context
== MEMFUNCDEF
)
10268 funcdef_flag
= true, decl_context
= FIELD
;
10269 else if (decl_context
== BITFIELD
)
10270 bitfield
= 1, decl_context
= FIELD
;
10271 else if (decl_context
== TEMPLATE_TYPE_ARG
)
10272 template_type_arg
= true, decl_context
= TYPENAME
;
10273 else if (decl_context
== TPARM
)
10274 template_parm_flag
= true, decl_context
= PARM
;
10276 if (initialized
> 1)
10277 funcdef_flag
= true;
10279 location_t typespec_loc
= smallest_type_quals_location (type_quals
,
10280 declspecs
->locations
);
10281 if (typespec_loc
== UNKNOWN_LOCATION
)
10282 typespec_loc
= declspecs
->locations
[ds_type_spec
];
10283 if (typespec_loc
== UNKNOWN_LOCATION
)
10284 typespec_loc
= input_location
;
10286 /* Look inside a declarator for the name being declared
10287 and get it as a string, for an error message. */
10288 for (id_declarator
= declarator
;
10290 id_declarator
= id_declarator
->declarator
)
10292 if (id_declarator
->kind
!= cdk_id
)
10293 innermost_code
= id_declarator
->kind
;
10295 switch (id_declarator
->kind
)
10298 if (id_declarator
->declarator
10299 && id_declarator
->declarator
->kind
== cdk_id
)
10301 sfk
= id_declarator
->declarator
->u
.id
.sfk
;
10302 if (sfk
== sfk_destructor
)
10309 tree qualifying_scope
= id_declarator
->u
.id
.qualifying_scope
;
10310 tree decl
= id_declarator
->u
.id
.unqualified_name
;
10313 if (qualifying_scope
)
10315 if (check_for_bare_parameter_packs (qualifying_scope
,
10316 id_declarator
->id_loc
))
10317 return error_mark_node
;
10318 if (at_function_scope_p ())
10322 A declarator-id shall not be qualified except
10325 None of the cases are permitted in block
10327 if (qualifying_scope
== global_namespace
)
10328 error ("invalid use of qualified-name %<::%D%>",
10330 else if (TYPE_P (qualifying_scope
))
10331 error ("invalid use of qualified-name %<%T::%D%>",
10332 qualifying_scope
, decl
);
10334 error ("invalid use of qualified-name %<%D::%D%>",
10335 qualifying_scope
, decl
);
10336 return error_mark_node
;
10338 else if (TYPE_P (qualifying_scope
))
10340 ctype
= qualifying_scope
;
10341 if (!MAYBE_CLASS_TYPE_P (ctype
))
10343 error ("%q#T is not a class or a namespace", ctype
);
10346 else if (innermost_code
!= cdk_function
10347 && current_class_type
10348 && !uniquely_derived_from_p (ctype
,
10349 current_class_type
))
10351 error ("invalid use of qualified-name %<%T::%D%>",
10352 qualifying_scope
, decl
);
10353 return error_mark_node
;
10356 else if (TREE_CODE (qualifying_scope
) == NAMESPACE_DECL
)
10357 in_namespace
= qualifying_scope
;
10359 switch (TREE_CODE (decl
))
10363 if (innermost_code
!= cdk_function
)
10365 error ("declaration of %qD as non-function", decl
);
10366 return error_mark_node
;
10368 else if (!qualifying_scope
10369 && !(current_class_type
&& at_class_scope_p ()))
10371 error ("declaration of %qD as non-member", decl
);
10372 return error_mark_node
;
10375 tree type
= TREE_OPERAND (decl
, 0);
10377 type
= constructor_name (type
);
10378 name
= identifier_to_locale (IDENTIFIER_POINTER (type
));
10383 case TEMPLATE_ID_EXPR
:
10385 tree fns
= TREE_OPERAND (decl
, 0);
10388 if (!identifier_p (dname
))
10389 dname
= OVL_NAME (dname
);
10391 /* Fall through. */
10393 case IDENTIFIER_NODE
:
10394 if (identifier_p (decl
))
10397 if (IDENTIFIER_KEYWORD_P (dname
))
10399 error ("declarator-id missing; using reserved word %qD",
10401 name
= identifier_to_locale (IDENTIFIER_POINTER (dname
));
10403 else if (!IDENTIFIER_CONV_OP_P (dname
))
10404 name
= identifier_to_locale (IDENTIFIER_POINTER (dname
));
10407 gcc_assert (flags
== NO_SPECIAL
);
10408 flags
= TYPENAME_FLAG
;
10409 sfk
= sfk_conversion
;
10410 tree glob
= get_global_binding (dname
);
10411 if (glob
&& TREE_CODE (glob
) == TYPE_DECL
)
10412 name
= identifier_to_locale (IDENTIFIER_POINTER (dname
));
10414 name
= "<invalid operator>";
10419 gcc_unreachable ();
10426 case cdk_reference
:
10431 name
= "structured binding";
10435 return error_mark_node
;
10438 gcc_unreachable ();
10440 if (id_declarator
->kind
== cdk_id
)
10446 The declarator in a function-definition shall have the form
10447 D1 ( parameter-declaration-clause) ... */
10448 if (funcdef_flag
&& innermost_code
!= cdk_function
)
10450 error ("function definition does not declare parameters");
10451 return error_mark_node
;
10454 if (flags
== TYPENAME_FLAG
10455 && innermost_code
!= cdk_function
10456 && ! (ctype
&& !declspecs
->any_specifiers_p
))
10458 error ("declaration of %qD as non-function", dname
);
10459 return error_mark_node
;
10462 if (dname
&& identifier_p (dname
))
10464 if (UDLIT_OPER_P (dname
)
10465 && innermost_code
!= cdk_function
)
10467 error ("declaration of %qD as non-function", dname
);
10468 return error_mark_node
;
10471 if (IDENTIFIER_ANY_OP_P (dname
))
10475 error ("declaration of %qD as %<typedef%>", dname
);
10476 return error_mark_node
;
10478 else if (decl_context
== PARM
|| decl_context
== CATCHPARM
)
10480 error ("declaration of %qD as parameter", dname
);
10481 return error_mark_node
;
10486 /* Anything declared one level down from the top level
10487 must be one of the parameters of a function
10488 (because the body is at least two levels down). */
10490 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
10491 by not allowing C++ class definitions to specify their parameters
10492 with xdecls (must be spec.d in the parmlist).
10494 Since we now wait to push a class scope until we are sure that
10495 we are in a legitimate method context, we must set oldcname
10496 explicitly (since current_class_name is not yet alive).
10498 We also want to avoid calling this a PARM if it is in a namespace. */
10500 if (decl_context
== NORMAL
&& !toplevel_bindings_p ())
10502 cp_binding_level
*b
= current_binding_level
;
10503 current_binding_level
= b
->level_chain
;
10504 if (current_binding_level
!= 0 && toplevel_bindings_p ())
10505 decl_context
= PARM
;
10506 current_binding_level
= b
;
10510 name
= decl_context
== PARM
? "parameter" : "type name";
10512 if (concept_p
&& typedef_p
)
10514 error_at (declspecs
->locations
[ds_concept
],
10515 "%<concept%> cannot appear in a typedef declaration");
10516 return error_mark_node
;
10519 if (constexpr_p
&& typedef_p
)
10521 error_at (declspecs
->locations
[ds_constexpr
],
10522 "%<constexpr%> cannot appear in a typedef declaration");
10523 return error_mark_node
;
10526 /* If there were multiple types specified in the decl-specifier-seq,
10527 issue an error message. */
10528 if (declspecs
->multiple_types_p
)
10530 error ("two or more data types in declaration of %qs", name
);
10531 return error_mark_node
;
10534 if (declspecs
->conflicting_specifiers_p
)
10536 error ("conflicting specifiers in declaration of %qs", name
);
10537 return error_mark_node
;
10540 /* Extract the basic type from the decl-specifier-seq. */
10541 type
= declspecs
->type
;
10542 if (type
== error_mark_node
)
10545 type_was_error_mark_node
= true;
10547 cp_warn_deprecated_use (type
);
10548 if (type
&& TREE_CODE (type
) == TYPE_DECL
)
10550 typedef_decl
= type
;
10551 type
= TREE_TYPE (typedef_decl
);
10552 if (DECL_ARTIFICIAL (typedef_decl
))
10553 cp_warn_deprecated_use (type
);
10555 /* No type at all: default to `int', and set DEFAULTED_INT
10556 because it was not a user-defined typedef. */
10557 if (type
== NULL_TREE
)
10559 if (signed_p
|| unsigned_p
|| long_p
|| short_p
)
10561 /* These imply 'int'. */
10562 type
= integer_type_node
;
10565 /* If we just have "complex", it is equivalent to "complex double". */
10566 else if (!longlong
&& !explicit_intN
10567 && decl_spec_seq_has_spec_p (declspecs
, ds_complex
))
10569 type
= double_type_node
;
10570 pedwarn (declspecs
->locations
[ds_complex
], OPT_Wpedantic
,
10571 "ISO C++ does not support plain %<complex%> meaning "
10572 "%<double complex%>");
10575 /* Gather flags. */
10576 explicit_int
= declspecs
->explicit_int_p
;
10577 explicit_char
= declspecs
->explicit_char_p
;
10580 /* See the code below that used this. */
10582 decl_attr
= DECL_ATTRIBUTES (typedef_decl
);
10584 typedef_type
= type
;
10586 if (sfk
== sfk_conversion
|| sfk
== sfk_deduction_guide
)
10587 ctor_return_type
= TREE_TYPE (dname
);
10589 ctor_return_type
= ctype
;
10591 if (sfk
!= sfk_none
)
10593 type
= check_special_function_return_type (sfk
, type
,
10596 declspecs
->locations
);
10597 type_quals
= TYPE_UNQUALIFIED
;
10599 else if (type
== NULL_TREE
)
10605 /* We handle `main' specially here, because 'main () { }' is so
10606 common. With no options, it is allowed. With -Wreturn-type,
10607 it is a warning. It is only an error with -pedantic-errors. */
10608 is_main
= (funcdef_flag
10609 && dname
&& identifier_p (dname
)
10610 && MAIN_NAME_P (dname
)
10611 && ctype
== NULL_TREE
10612 && in_namespace
== NULL_TREE
10613 && current_namespace
== global_namespace
);
10615 if (type_was_error_mark_node
)
10616 /* We've already issued an error, don't complain more. */;
10617 else if (in_system_header_at (input_location
) || flag_ms_extensions
)
10618 /* Allow it, sigh. */;
10619 else if (! is_main
)
10620 permerror (input_location
, "ISO C++ forbids declaration of %qs with no type", name
);
10622 pedwarn (input_location
, OPT_Wpedantic
,
10623 "ISO C++ forbids declaration of %qs with no type", name
);
10625 warning (OPT_Wreturn_type
,
10626 "ISO C++ forbids declaration of %qs with no type", name
);
10628 if (type_was_error_mark_node
&& template_parm_flag
)
10629 /* FIXME we should be able to propagate the error_mark_node as is
10630 for other contexts too. */
10631 type
= error_mark_node
;
10633 type
= integer_type_node
;
10640 if (! int_n_enabled_p
[declspecs
->int_n_idx
])
10642 error ("%<__int%d%> is not supported by this target",
10643 int_n_data
[declspecs
->int_n_idx
].bitsize
);
10644 explicit_intN
= false;
10646 else if (pedantic
&& ! in_system_header_at (input_location
))
10647 pedwarn (input_location
, OPT_Wpedantic
,
10648 "ISO C++ does not support %<__int%d%> for %qs",
10649 int_n_data
[declspecs
->int_n_idx
].bitsize
, name
);
10652 /* Now process the modifiers that were specified
10653 and check for invalid combinations. */
10655 /* Long double is a special combination. */
10656 if (long_p
&& !longlong
&& TYPE_MAIN_VARIANT (type
) == double_type_node
)
10659 type
= cp_build_qualified_type (long_double_type_node
,
10660 cp_type_quals (type
));
10663 /* Check all other uses of type modifiers. */
10665 if (unsigned_p
|| signed_p
|| long_p
|| short_p
)
10672 loc
= declspecs
->locations
[ds_unsigned
];
10677 loc
= declspecs
->locations
[ds_signed
];
10682 loc
= declspecs
->locations
[ds_long_long
];
10687 loc
= declspecs
->locations
[ds_long
];
10689 else /* if (short_p) */
10692 loc
= declspecs
->locations
[ds_short
];
10697 if (signed_p
&& unsigned_p
)
10699 gcc_rich_location
richloc (declspecs
->locations
[ds_signed
]);
10700 richloc
.add_range (declspecs
->locations
[ds_unsigned
]);
10701 error_at (&richloc
,
10702 "%<signed%> and %<unsigned%> specified together");
10704 else if (long_p
&& short_p
)
10706 gcc_rich_location
richloc (declspecs
->locations
[ds_long
]);
10707 richloc
.add_range (declspecs
->locations
[ds_short
]);
10708 error_at (&richloc
, "%<long%> and %<short%> specified together");
10710 else if (TREE_CODE (type
) != INTEGER_TYPE
10711 || type
== char16_type_node
|| type
== char32_type_node
10712 || ((long_p
|| short_p
)
10713 && (explicit_char
|| explicit_intN
)))
10714 error_at (loc
, "%qs specified with %qT", key
, type
);
10715 else if (!explicit_int
&& !defaulted_int
10716 && !explicit_char
&& !explicit_intN
)
10720 pedwarn (loc
, OPT_Wpedantic
, "%qs specified with %qT",
10722 ok
= !flag_pedantic_errors
;
10724 else if (declspecs
->decltype_p
)
10725 error_at (loc
, "%qs specified with %<decltype%>", key
);
10727 error_at (loc
, "%qs specified with %<typeof%>", key
);
10732 /* Discard the type modifiers if they are invalid. */
10735 unsigned_p
= false;
10743 /* Decide whether an integer type is signed or not.
10744 Optionally treat bitfields as signed by default. */
10748 It is implementation-defined whether a plain (neither
10749 explicitly signed or unsigned) char, short, int, or long
10750 bit-field is signed or unsigned.
10752 Naturally, we extend this to long long as well. Note that
10753 this does not include wchar_t. */
10754 || (bitfield
&& !flag_signed_bitfields
10756 /* A typedef for plain `int' without `signed' can be
10757 controlled just like plain `int', but a typedef for
10758 `signed int' cannot be so controlled. */
10760 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
))
10761 && TREE_CODE (type
) == INTEGER_TYPE
10762 && !same_type_p (TYPE_MAIN_VARIANT (type
), wchar_type_node
)))
10765 type
= int_n_trees
[declspecs
->int_n_idx
].unsigned_type
;
10767 type
= long_long_unsigned_type_node
;
10769 type
= long_unsigned_type_node
;
10771 type
= short_unsigned_type_node
;
10772 else if (type
== char_type_node
)
10773 type
= unsigned_char_type_node
;
10774 else if (typedef_decl
)
10775 type
= unsigned_type_for (type
);
10777 type
= unsigned_type_node
;
10779 else if (signed_p
&& type
== char_type_node
)
10780 type
= signed_char_type_node
;
10781 else if (explicit_intN
)
10782 type
= int_n_trees
[declspecs
->int_n_idx
].signed_type
;
10784 type
= long_long_integer_type_node
;
10786 type
= long_integer_type_node
;
10788 type
= short_integer_type_node
;
10790 if (decl_spec_seq_has_spec_p (declspecs
, ds_complex
))
10792 if (TREE_CODE (type
) != INTEGER_TYPE
&& TREE_CODE (type
) != REAL_TYPE
)
10793 error ("complex invalid for %qs", name
);
10794 /* If a modifier is specified, the resulting complex is the complex
10795 form of TYPE. E.g, "complex short" is "complex short int". */
10796 else if (type
== integer_type_node
)
10797 type
= complex_integer_type_node
;
10798 else if (type
== float_type_node
)
10799 type
= complex_float_type_node
;
10800 else if (type
== double_type_node
)
10801 type
= complex_double_type_node
;
10802 else if (type
== long_double_type_node
)
10803 type
= complex_long_double_type_node
;
10805 type
= build_complex_type (type
);
10808 /* If we're using the injected-class-name to form a compound type or a
10809 declaration, replace it with the underlying class so we don't get
10810 redundant typedefs in the debug output. But if we are returning the
10811 type unchanged, leave it alone so that it's available to
10812 maybe_get_template_decl_from_type_decl. */
10813 if (CLASS_TYPE_P (type
)
10814 && DECL_SELF_REFERENCE_P (TYPE_NAME (type
))
10815 && type
== TREE_TYPE (TYPE_NAME (type
))
10816 && (declarator
|| type_quals
))
10817 type
= DECL_ORIGINAL_TYPE (TYPE_NAME (type
));
10819 type_quals
|= cp_type_quals (type
);
10820 type
= cp_build_qualified_type_real
10821 (type
, type_quals
, ((((typedef_decl
&& !DECL_ARTIFICIAL (typedef_decl
))
10822 || declspecs
->decltype_p
)
10823 ? tf_ignore_bad_quals
: 0) | tf_warning_or_error
));
10824 /* We might have ignored or rejected some of the qualifiers. */
10825 type_quals
= cp_type_quals (type
);
10827 if (cxx_dialect
>= cxx17
&& type
&& is_auto (type
)
10828 && innermost_code
!= cdk_function
10829 && id_declarator
&& declarator
!= id_declarator
)
10830 if (tree tmpl
= CLASS_PLACEHOLDER_TEMPLATE (type
))
10832 error_at (typespec_loc
, "template placeholder type %qT must be followed "
10833 "by a simple declarator-id", type
);
10834 inform (DECL_SOURCE_LOCATION (tmpl
), "%qD declared here", tmpl
);
10838 inlinep
= decl_spec_seq_has_spec_p (declspecs
, ds_inline
);
10839 virtualp
= decl_spec_seq_has_spec_p (declspecs
, ds_virtual
);
10840 explicitp
= decl_spec_seq_has_spec_p (declspecs
, ds_explicit
);
10842 storage_class
= declspecs
->storage_class
;
10843 if (storage_class
== sc_static
)
10844 staticp
= 1 + (decl_context
== FIELD
);
10850 gcc_rich_location
richloc (declspecs
->locations
[ds_virtual
]);
10851 richloc
.add_range (declspecs
->locations
[ds_storage_class
]);
10852 error_at (&richloc
, "member %qD cannot be declared both %<virtual%> "
10853 "and %<static%>", dname
);
10854 storage_class
= sc_none
;
10859 gcc_rich_location
richloc (declspecs
->locations
[ds_virtual
]);
10860 richloc
.add_range (declspecs
->locations
[ds_constexpr
]);
10861 error_at (&richloc
, "member %qD cannot be declared both %<virtual%> "
10862 "and %<constexpr%>", dname
);
10865 friendp
= decl_spec_seq_has_spec_p (declspecs
, ds_friend
);
10867 /* Issue errors about use of storage classes for parameters. */
10868 if (decl_context
== PARM
)
10872 error_at (declspecs
->locations
[ds_typedef
],
10873 "typedef declaration invalid in parameter declaration");
10874 return error_mark_node
;
10876 else if (template_parm_flag
&& storage_class
!= sc_none
)
10878 error_at (min_location (declspecs
->locations
[ds_thread
],
10879 declspecs
->locations
[ds_storage_class
]),
10880 "storage class specified for template parameter %qs",
10882 return error_mark_node
;
10884 else if (storage_class
== sc_static
10885 || storage_class
== sc_extern
10888 error_at (min_location (declspecs
->locations
[ds_thread
],
10889 declspecs
->locations
[ds_storage_class
]),
10890 "storage class specified for parameter %qs", name
);
10891 return error_mark_node
;
10894 /* Function parameters cannot be concept. */
10896 error_at (declspecs
->locations
[ds_concept
],
10897 "a parameter cannot be declared %<concept%>");
10898 /* Function parameters cannot be constexpr. If we saw one, moan
10899 and pretend it wasn't there. */
10900 else if (constexpr_p
)
10902 error_at (declspecs
->locations
[ds_constexpr
],
10903 "a parameter cannot be declared %<constexpr%>");
10908 /* Give error if `virtual' is used outside of class declaration. */
10910 && (current_class_name
== NULL_TREE
|| decl_context
!= FIELD
))
10912 error_at (declspecs
->locations
[ds_virtual
],
10913 "%<virtual%> outside class declaration");
10917 if (innermost_code
== cdk_decomp
)
10919 location_t loc
= (declarator
->kind
== cdk_reference
10920 ? declarator
->declarator
->id_loc
: declarator
->id_loc
);
10922 error_at (declspecs
->locations
[ds_inline
],
10923 "structured binding declaration cannot be %<inline%>");
10925 error_at (declspecs
->locations
[ds_typedef
],
10926 "structured binding declaration cannot be %<typedef%>");
10928 error_at (declspecs
->locations
[ds_constexpr
], "structured "
10929 "binding declaration cannot be %<constexpr%>");
10931 error_at (declspecs
->locations
[ds_thread
],
10932 "structured binding declaration cannot be %qs",
10933 declspecs
->gnu_thread_keyword_p
10934 ? "__thread" : "thread_local");
10936 error_at (declspecs
->locations
[ds_concept
],
10937 "structured binding declaration cannot be %<concept%>");
10938 switch (storage_class
)
10943 error_at (loc
, "structured binding declaration cannot be "
10947 error_at (loc
, "structured binding declaration cannot be "
10951 error_at (loc
, "structured binding declaration cannot be "
10955 error_at (loc
, "structured binding declaration cannot be "
10959 error_at (loc
, "structured binding declaration cannot be "
10963 gcc_unreachable ();
10965 if (TREE_CODE (type
) != TEMPLATE_TYPE_PARM
10966 || TYPE_IDENTIFIER (type
) != auto_identifier
)
10968 if (type
!= error_mark_node
)
10970 error_at (loc
, "structured binding declaration cannot have "
10973 "type must be cv-qualified %<auto%> or reference to "
10974 "cv-qualified %<auto%>");
10976 type
= build_qualified_type (make_auto (), type_quals
);
10977 declspecs
->type
= type
;
10984 storage_class
= sc_none
;
10986 declspecs
->storage_class
= sc_none
;
10987 declspecs
->locations
[ds_thread
] = UNKNOWN_LOCATION
;
10990 /* Static anonymous unions are dealt with here. */
10991 if (staticp
&& decl_context
== TYPENAME
10993 && ANON_AGGR_TYPE_P (declspecs
->type
))
10994 decl_context
= FIELD
;
10996 /* Warn about storage classes that are invalid for certain
10997 kinds of declarations (parameters, typenames, etc.). */
11000 && storage_class
!= sc_extern
11001 && storage_class
!= sc_static
)
11004 error ("multiple storage classes in declaration of %qs", name
);
11007 if (decl_context
!= NORMAL
11008 && ((storage_class
!= sc_none
11009 && storage_class
!= sc_mutable
)
11012 if ((decl_context
== PARM
|| decl_context
== CATCHPARM
)
11013 && (storage_class
== sc_register
11014 || storage_class
== sc_auto
))
11016 else if (typedef_p
)
11018 else if (decl_context
== FIELD
11019 /* C++ allows static class elements. */
11020 && storage_class
== sc_static
)
11021 /* C++ also allows inlines and signed and unsigned elements,
11022 but in those cases we don't come in here. */
11027 = min_location (declspecs
->locations
[ds_thread
],
11028 declspecs
->locations
[ds_storage_class
]);
11029 if (decl_context
== FIELD
)
11030 error_at (loc
, "storage class specified for %qs", name
);
11031 else if (decl_context
== PARM
|| decl_context
== CATCHPARM
)
11032 error_at (loc
, "storage class specified for parameter %qs", name
);
11034 error_at (loc
, "storage class specified for typename");
11035 if (storage_class
== sc_register
11036 || storage_class
== sc_auto
11037 || storage_class
== sc_extern
11039 storage_class
= sc_none
;
11042 else if (storage_class
== sc_extern
&& funcdef_flag
11043 && ! toplevel_bindings_p ())
11044 error ("nested function %qs declared %<extern%>", name
);
11045 else if (toplevel_bindings_p ())
11047 if (storage_class
== sc_auto
)
11048 error ("top-level declaration of %qs specifies %<auto%>", name
);
11051 && storage_class
!= sc_extern
11052 && storage_class
!= sc_static
)
11054 if (declspecs
->gnu_thread_keyword_p
)
11055 pedwarn (declspecs
->locations
[ds_thread
],
11056 0, "function-scope %qs implicitly auto and "
11057 "declared %<__thread%>", name
);
11059 /* When thread_local is applied to a variable of block scope the
11060 storage-class-specifier static is implied if it does not appear
11062 storage_class
= declspecs
->storage_class
= sc_static
;
11066 if (storage_class
&& friendp
)
11068 error_at (min_location (declspecs
->locations
[ds_thread
],
11069 declspecs
->locations
[ds_storage_class
]),
11070 "storage class specifiers invalid in friend function "
11072 storage_class
= sc_none
;
11076 if (!id_declarator
)
11077 unqualified_id
= NULL_TREE
;
11080 unqualified_id
= id_declarator
->u
.id
.unqualified_name
;
11081 switch (TREE_CODE (unqualified_id
))
11084 unqualified_id
= TREE_OPERAND (unqualified_id
, 0);
11085 if (TYPE_P (unqualified_id
))
11086 unqualified_id
= constructor_name (unqualified_id
);
11089 case IDENTIFIER_NODE
:
11090 case TEMPLATE_ID_EXPR
:
11094 gcc_unreachable ();
11098 if (declspecs
->std_attributes
)
11100 location_t attr_loc
= declspecs
->locations
[ds_std_attribute
];
11101 if (warning_at (attr_loc
, OPT_Wattributes
, "attribute ignored"))
11102 inform (attr_loc
, "an attribute that appertains to a type-specifier "
11106 /* Determine the type of the entity declared by recurring on the
11108 for (; declarator
; declarator
= declarator
->declarator
)
11110 const cp_declarator
*inner_declarator
;
11113 if (type
== error_mark_node
)
11114 return error_mark_node
;
11116 attrs
= declarator
->attributes
;
11122 if (declarator
== NULL
|| declarator
->kind
== cdk_id
)
11123 attr_flags
|= (int) ATTR_FLAG_DECL_NEXT
;
11124 if (declarator
->kind
== cdk_function
)
11125 attr_flags
|= (int) ATTR_FLAG_FUNCTION_NEXT
;
11126 if (declarator
->kind
== cdk_array
)
11127 attr_flags
|= (int) ATTR_FLAG_ARRAY_NEXT
;
11128 returned_attrs
= decl_attributes (&type
,
11129 chainon (returned_attrs
, attrs
),
11133 inner_declarator
= declarator
->declarator
;
11135 /* We don't want to warn in parameter context because we don't
11136 yet know if the parse will succeed, and this might turn out
11137 to be a constructor call. */
11138 if (decl_context
!= PARM
11139 && decl_context
!= TYPENAME
11141 && declarator
->parenthesized
!= UNKNOWN_LOCATION
11142 /* If the type is class-like and the inner name used a
11143 global namespace qualifier, we need the parens.
11144 Unfortunately all we can tell is whether a qualified name
11145 was used or not. */
11146 && !(inner_declarator
11147 && inner_declarator
->kind
== cdk_id
11148 && inner_declarator
->u
.id
.qualifying_scope
11149 && (MAYBE_CLASS_TYPE_P (type
)
11150 || TREE_CODE (type
) == ENUMERAL_TYPE
)))
11151 warning_at (declarator
->parenthesized
, OPT_Wparentheses
,
11152 "unnecessary parentheses in declaration of %qs", name
);
11153 if (declarator
->kind
== cdk_id
|| declarator
->kind
== cdk_decomp
)
11156 switch (declarator
->kind
)
11159 type
= create_array_type_for_decl (dname
, type
,
11160 declarator
->u
.array
.bounds
);
11161 if (!valid_array_size_p (input_location
, type
, dname
))
11162 type
= error_mark_node
;
11164 if (declarator
->std_attributes
)
11167 The optional attribute-specifier-seq appertains to the
11169 returned_attrs
= chainon (returned_attrs
,
11170 declarator
->std_attributes
);
11178 /* Declaring a function type. */
11180 input_location
= declspecs
->locations
[ds_type_spec
];
11181 abstract_virtuals_error (ACU_RETURN
, type
);
11182 input_location
= saved_loc
;
11184 /* Pick up type qualifiers which should be applied to `this'. */
11185 memfn_quals
= declarator
->u
.function
.qualifiers
;
11186 /* Pick up virt-specifiers. */
11187 virt_specifiers
= declarator
->u
.function
.virt_specifiers
;
11188 /* And ref-qualifier, too */
11189 rqual
= declarator
->u
.function
.ref_qualifier
;
11190 /* And tx-qualifier. */
11191 tree tx_qual
= declarator
->u
.function
.tx_qualifier
;
11192 /* Pick up the exception specifications. */
11193 raises
= declarator
->u
.function
.exception_specification
;
11194 /* If the exception-specification is ill-formed, let's pretend
11195 there wasn't one. */
11196 if (raises
== error_mark_node
)
11197 raises
= NULL_TREE
;
11200 error_at (location_of (reqs
), "requires-clause on return type");
11201 reqs
= declarator
->u
.function
.requires_clause
;
11203 /* Say it's a definition only for the CALL_EXPR
11204 closest to the identifier. */
11205 funcdecl_p
= inner_declarator
&& inner_declarator
->kind
== cdk_id
;
11207 /* Handle a late-specified return type. */
11208 tree late_return_type
= declarator
->u
.function
.late_return_type
;
11210 /* This is the case e.g. for
11211 using T = auto () -> int. */
11212 || inner_declarator
== NULL
)
11214 if (tree auto_node
= type_uses_auto (type
))
11216 if (!late_return_type
)
11218 if (current_class_type
11219 && LAMBDA_TYPE_P (current_class_type
))
11220 /* OK for C++11 lambdas. */;
11221 else if (cxx_dialect
< cxx14
)
11223 error ("%qs function uses "
11224 "%<auto%> type specifier without trailing "
11225 "return type", name
);
11226 inform (input_location
, "deduced return type "
11227 "only available with -std=c++14 or "
11232 error ("virtual function cannot "
11233 "have deduced return type");
11237 else if (!is_auto (type
) && sfk
!= sfk_conversion
)
11239 error ("%qs function with trailing return type has"
11240 " %qT as its type rather than plain %<auto%>",
11242 return error_mark_node
;
11244 else if (is_auto (type
) && AUTO_IS_DECLTYPE (type
))
11247 error ("%qs function with trailing return type has "
11248 "%<decltype(auto)%> as its type rather than "
11249 "plain %<auto%>", name
);
11251 error ("invalid use of %<decltype(auto)%>");
11252 return error_mark_node
;
11254 tree tmpl
= CLASS_PLACEHOLDER_TEMPLATE (auto_node
);
11256 if (tree late_auto
= type_uses_auto (late_return_type
))
11257 tmpl
= CLASS_PLACEHOLDER_TEMPLATE (late_auto
);
11260 if (!dguide_name_p (unqualified_id
))
11262 error_at (declarator
->id_loc
, "deduced class "
11263 "type %qD in function return type",
11265 inform (DECL_SOURCE_LOCATION (tmpl
),
11266 "%qD declared here", tmpl
);
11267 return error_mark_node
;
11269 else if (!late_return_type
)
11271 error_at (declarator
->id_loc
, "deduction guide "
11272 "for %qT must have trailing return "
11273 "type", TREE_TYPE (tmpl
));
11274 inform (DECL_SOURCE_LOCATION (tmpl
),
11275 "%qD declared here", tmpl
);
11276 return error_mark_node
;
11278 else if (CLASS_TYPE_P (late_return_type
)
11279 && CLASSTYPE_TEMPLATE_INFO (late_return_type
)
11280 && (CLASSTYPE_TI_TEMPLATE (late_return_type
)
11284 error ("trailing return type %qT of deduction guide "
11285 "is not a specialization of %qT",
11286 late_return_type
, TREE_TYPE (tmpl
));
11289 else if (late_return_type
11290 && sfk
!= sfk_conversion
)
11292 if (cxx_dialect
< cxx11
)
11293 /* Not using maybe_warn_cpp0x because this should
11294 always be an error. */
11295 error ("trailing return type only available with "
11296 "-std=c++11 or -std=gnu++11");
11298 error ("%qs function with trailing return type not "
11299 "declared with %<auto%> type specifier", name
);
11300 return error_mark_node
;
11303 type
= splice_late_return_type (type
, late_return_type
);
11304 if (type
== error_mark_node
)
11305 return error_mark_node
;
11307 if (late_return_type
)
11309 late_return_type_p
= true;
11310 type_quals
= cp_type_quals (type
);
11313 if (type_quals
!= TYPE_UNQUALIFIED
)
11315 if (SCALAR_TYPE_P (type
) || VOID_TYPE_P (type
))
11316 warning_at (typespec_loc
, OPT_Wignored_qualifiers
, "type "
11317 "qualifiers ignored on function return type");
11318 /* We now know that the TYPE_QUALS don't apply to the
11319 decl, but to its return type. */
11320 type_quals
= TYPE_UNQUALIFIED
;
11323 /* Error about some types functions can't return. */
11325 if (TREE_CODE (type
) == FUNCTION_TYPE
)
11327 error_at (typespec_loc
, "%qs declared as function returning "
11328 "a function", name
);
11329 return error_mark_node
;
11331 if (TREE_CODE (type
) == ARRAY_TYPE
)
11333 error_at (typespec_loc
, "%qs declared as function returning "
11335 return error_mark_node
;
11338 if (ctype
== NULL_TREE
11339 && decl_context
== FIELD
11342 ctype
= current_class_type
;
11344 if (ctype
&& (sfk
== sfk_constructor
11345 || sfk
== sfk_destructor
))
11347 /* We are within a class's scope. If our declarator name
11348 is the same as the class name, and we are defining
11349 a function, then it is a constructor/destructor, and
11350 therefore returns a void type. */
11352 /* ISO C++ 12.4/2. A destructor may not be declared
11353 const or volatile. A destructor may not be static.
11354 A destructor may not be declared with ref-qualifier.
11356 ISO C++ 12.1. A constructor may not be declared
11357 const or volatile. A constructor may not be
11358 virtual. A constructor may not be static.
11359 A constructor may not be declared with ref-qualifier. */
11361 error ((flags
== DTOR_FLAG
)
11362 ? G_("destructor cannot be static member function")
11363 : G_("constructor cannot be static member function"));
11366 error ((flags
== DTOR_FLAG
)
11367 ? G_("destructors may not be cv-qualified")
11368 : G_("constructors may not be cv-qualified"));
11369 memfn_quals
= TYPE_UNQUALIFIED
;
11374 maybe_warn_cpp0x (CPP0X_REF_QUALIFIER
);
11375 error ((flags
== DTOR_FLAG
)
11376 ? G_("destructors may not be ref-qualified")
11377 : G_("constructors may not be ref-qualified"));
11378 rqual
= REF_QUAL_NONE
;
11381 if (decl_context
== FIELD
11382 && !member_function_or_else (ctype
,
11383 current_class_type
,
11385 return error_mark_node
;
11387 if (flags
!= DTOR_FLAG
)
11389 /* It's a constructor. */
11390 if (explicitp
== 1)
11394 permerror (declspecs
->locations
[ds_virtual
],
11395 "constructors cannot be declared %<virtual%>");
11398 if (decl_context
== FIELD
11399 && sfk
!= sfk_constructor
)
11400 return error_mark_node
;
11402 if (decl_context
== FIELD
)
11409 /* Cannot be both friend and virtual. */
11410 gcc_rich_location
richloc (declspecs
->locations
[ds_virtual
]);
11411 richloc
.add_range (declspecs
->locations
[ds_friend
]);
11412 error_at (&richloc
, "virtual functions cannot be friends");
11415 if (decl_context
== NORMAL
)
11416 error ("friend declaration not in class definition");
11417 if (current_function_decl
&& funcdef_flag
)
11419 error ("can%'t define friend function %qs in a local "
11420 "class definition", name
);
11424 else if (ctype
&& sfk
== sfk_conversion
)
11426 if (explicitp
== 1)
11428 maybe_warn_cpp0x (CPP0X_EXPLICIT_CONVERSION
);
11431 if (late_return_type_p
)
11432 error ("a conversion function cannot have a trailing return type");
11434 else if (sfk
== sfk_deduction_guide
)
11436 if (explicitp
== 1)
11440 tree pushed_scope
= NULL_TREE
;
11442 && decl_context
!= FIELD
11443 && inner_declarator
->u
.id
.qualifying_scope
11444 && CLASS_TYPE_P (inner_declarator
->u
.id
.qualifying_scope
))
11446 = push_scope (inner_declarator
->u
.id
.qualifying_scope
);
11448 arg_types
= grokparms (declarator
->u
.function
.parameters
, &parms
);
11451 pop_scope (pushed_scope
);
11453 if (inner_declarator
11454 && inner_declarator
->kind
== cdk_id
11455 && inner_declarator
->u
.id
.sfk
== sfk_destructor
11456 && arg_types
!= void_list_node
)
11458 error ("destructors may not have parameters");
11459 arg_types
= void_list_node
;
11463 type
= build_function_type (type
, arg_types
);
11465 tree attrs
= declarator
->std_attributes
;
11468 tree att
= build_tree_list (tx_qual
, NULL_TREE
);
11469 /* transaction_safe applies to the type, but
11470 transaction_safe_dynamic applies to the function. */
11471 if (is_attribute_p ("transaction_safe", tx_qual
))
11472 attrs
= chainon (attrs
, att
);
11474 returned_attrs
= chainon (returned_attrs
, att
);
11479 The optional attribute-specifier-seq appertains to
11480 the function type. */
11481 decl_attributes (&type
, attrs
, 0);
11484 type
= build_exception_variant (type
, raises
);
11489 case cdk_reference
:
11491 /* Filter out pointers-to-references and references-to-references.
11492 We can get these if a TYPE_DECL is used. */
11494 if (TYPE_REF_P (type
))
11496 if (declarator
->kind
!= cdk_reference
)
11498 error ("cannot declare pointer to %q#T", type
);
11499 type
= TREE_TYPE (type
);
11502 /* In C++0x, we allow reference to reference declarations
11503 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
11504 and template type arguments [14.3.1/4 temp.arg.type]. The
11505 check for direct reference to reference declarations, which
11506 are still forbidden, occurs below. Reasoning behind the change
11507 can be found in DR106, DR540, and the rvalue reference
11509 else if (cxx_dialect
== cxx98
)
11511 error ("cannot declare reference to %q#T", type
);
11512 type
= TREE_TYPE (type
);
11515 else if (VOID_TYPE_P (type
))
11517 if (declarator
->kind
== cdk_reference
)
11518 error ("cannot declare reference to %q#T", type
);
11519 else if (declarator
->kind
== cdk_ptrmem
)
11520 error ("cannot declare pointer to %q#T member", type
);
11523 /* We now know that the TYPE_QUALS don't apply to the decl,
11524 but to the target of the pointer. */
11525 type_quals
= TYPE_UNQUALIFIED
;
11527 /* This code used to handle METHOD_TYPE, but I don't think it's
11528 possible to get it here anymore. */
11529 gcc_assert (TREE_CODE (type
) != METHOD_TYPE
);
11530 if (declarator
->kind
== cdk_ptrmem
11531 && TREE_CODE (type
) == FUNCTION_TYPE
)
11533 memfn_quals
|= type_memfn_quals (type
);
11534 type
= build_memfn_type (type
,
11535 declarator
->u
.pointer
.class_type
,
11538 if (type
== error_mark_node
)
11539 return error_mark_node
;
11541 rqual
= REF_QUAL_NONE
;
11542 memfn_quals
= TYPE_UNQUALIFIED
;
11545 if (TREE_CODE (type
) == FUNCTION_TYPE
11546 && (type_memfn_quals (type
) != TYPE_UNQUALIFIED
11547 || type_memfn_rqual (type
) != REF_QUAL_NONE
))
11548 error (declarator
->kind
== cdk_reference
11549 ? G_("cannot declare reference to qualified function type %qT")
11550 : G_("cannot declare pointer to qualified function type %qT"),
11553 /* When the pointed-to type involves components of variable size,
11554 care must be taken to ensure that the size evaluation code is
11555 emitted early enough to dominate all the possible later uses
11556 and late enough for the variables on which it depends to have
11559 This is expected to happen automatically when the pointed-to
11560 type has a name/declaration of it's own, but special attention
11561 is required if the type is anonymous.
11563 We handle the NORMAL and FIELD contexts here by inserting a
11564 dummy statement that just evaluates the size at a safe point
11565 and ensures it is not deferred until e.g. within a deeper
11566 conditional context (c++/43555).
11568 We expect nothing to be needed here for PARM or TYPENAME.
11569 Evaluating the size at this point for TYPENAME would
11570 actually be incorrect, as we might be in the middle of an
11571 expression with side effects on the pointed-to type size
11572 "arguments" prior to the pointer declaration point and the
11573 size evaluation could end up prior to the side effects. */
11575 if (!TYPE_NAME (type
)
11576 && (decl_context
== NORMAL
|| decl_context
== FIELD
)
11577 && at_function_scope_p ()
11578 && variably_modified_type_p (type
, NULL_TREE
))
11580 TYPE_NAME (type
) = build_decl (UNKNOWN_LOCATION
, TYPE_DECL
,
11582 add_decl_expr (TYPE_NAME (type
));
11585 if (declarator
->kind
== cdk_reference
)
11587 /* In C++0x, the type we are creating a reference to might be
11588 a typedef which is itself a reference type. In that case,
11589 we follow the reference collapsing rules in
11590 [7.1.3/8 dcl.typedef] to create the final reference type:
11592 "If a typedef TD names a type that is a reference to a type
11593 T, an attempt to create the type 'lvalue reference to cv TD'
11594 creates the type 'lvalue reference to T,' while an attempt
11595 to create the type "rvalue reference to cv TD' creates the
11598 if (VOID_TYPE_P (type
))
11599 /* We already gave an error. */;
11600 else if (TYPE_REF_P (type
))
11602 if (declarator
->u
.reference
.rvalue_ref
)
11603 /* Leave type alone. */;
11605 type
= cp_build_reference_type (TREE_TYPE (type
), false);
11608 type
= cp_build_reference_type
11609 (type
, declarator
->u
.reference
.rvalue_ref
);
11611 /* In C++0x, we need this check for direct reference to
11612 reference declarations, which are forbidden by
11613 [8.3.2/5 dcl.ref]. Reference to reference declarations
11614 are only allowed indirectly through typedefs and template
11615 type arguments. Example:
11617 void foo(int & &); // invalid ref-to-ref decl
11619 typedef int & int_ref;
11620 void foo(int_ref &); // valid ref-to-ref decl
11622 if (inner_declarator
&& inner_declarator
->kind
== cdk_reference
)
11623 error ("cannot declare reference to %q#T, which is not "
11624 "a typedef or a template type argument", type
);
11626 else if (TREE_CODE (type
) == METHOD_TYPE
)
11627 type
= build_ptrmemfunc_type (build_pointer_type (type
));
11628 else if (declarator
->kind
== cdk_ptrmem
)
11630 gcc_assert (TREE_CODE (declarator
->u
.pointer
.class_type
)
11631 != NAMESPACE_DECL
);
11632 if (declarator
->u
.pointer
.class_type
== error_mark_node
)
11633 /* We will already have complained. */
11634 type
= error_mark_node
;
11636 type
= build_ptrmem_type (declarator
->u
.pointer
.class_type
,
11640 type
= build_pointer_type (type
);
11642 /* Process a list of type modifier keywords (such as
11643 const or volatile) that were given inside the `*' or `&'. */
11645 if (declarator
->u
.pointer
.qualifiers
)
11648 = cp_build_qualified_type (type
,
11649 declarator
->u
.pointer
.qualifiers
);
11650 type_quals
= cp_type_quals (type
);
11653 /* Apply C++11 attributes to the pointer, and not to the
11654 type pointed to. This is unlike what is done for GNU
11655 attributes above. It is to comply with [dcl.ptr]/1:
11657 [the optional attribute-specifier-seq (7.6.1) appertains
11658 to the pointer and not to the object pointed to]. */
11659 if (declarator
->std_attributes
)
11660 decl_attributes (&type
, declarator
->std_attributes
,
11670 gcc_unreachable ();
11674 /* A `constexpr' specifier used in an object declaration declares
11675 the object as `const'. */
11676 if (constexpr_p
&& innermost_code
!= cdk_function
)
11678 /* DR1688 says that a `constexpr' specifier in combination with
11679 `volatile' is valid. */
11681 if (!TYPE_REF_P (type
))
11683 type_quals
|= TYPE_QUAL_CONST
;
11684 type
= cp_build_qualified_type (type
, type_quals
);
11688 if (unqualified_id
&& TREE_CODE (unqualified_id
) == TEMPLATE_ID_EXPR
11689 && TREE_CODE (type
) != FUNCTION_TYPE
11690 && TREE_CODE (type
) != METHOD_TYPE
11691 && !variable_template_p (TREE_OPERAND (unqualified_id
, 0)))
11693 error ("template-id %qD used as a declarator",
11695 unqualified_id
= dname
;
11698 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
11699 qualified with a class-name, turn it into a METHOD_TYPE, unless
11700 we know that the function is static. We take advantage of this
11701 opportunity to do other processing that pertains to entities
11702 explicitly declared to be class members. Note that if DECLARATOR
11703 is non-NULL, we know it is a cdk_id declarator; otherwise, we
11704 would not have exited the loop above. */
11706 && declarator
->kind
== cdk_id
11707 && declarator
->u
.id
.qualifying_scope
11708 && MAYBE_CLASS_TYPE_P (declarator
->u
.id
.qualifying_scope
))
11710 ctype
= declarator
->u
.id
.qualifying_scope
;
11711 ctype
= TYPE_MAIN_VARIANT (ctype
);
11712 template_count
= num_template_headers_for_class (ctype
);
11714 if (ctype
== current_class_type
)
11718 permerror (input_location
, "member functions are implicitly "
11719 "friends of their class");
11723 permerror (declarator
->id_loc
,
11724 "extra qualification %<%T::%> on member %qs",
11727 else if (/* If the qualifying type is already complete, then we
11728 can skip the following checks. */
11729 !COMPLETE_TYPE_P (ctype
)
11730 && (/* If the function is being defined, then
11731 qualifying type must certainly be complete. */
11733 /* A friend declaration of "T::f" is OK, even if
11734 "T" is a template parameter. But, if this
11735 function is not a friend, the qualifying type
11736 must be a class. */
11737 || (!friendp
&& !CLASS_TYPE_P (ctype
))
11738 /* For a declaration, the type need not be
11739 complete, if either it is dependent (since there
11740 is no meaningful definition of complete in that
11741 case) or the qualifying class is currently being
11743 || !(dependent_type_p (ctype
)
11744 || currently_open_class (ctype
)))
11745 /* Check that the qualifying type is complete. */
11746 && !complete_type_or_else (ctype
, NULL_TREE
))
11747 return error_mark_node
;
11748 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
11750 if (current_class_type
11751 && (!friendp
|| funcdef_flag
|| initialized
))
11753 error (funcdef_flag
|| initialized
11754 ? G_("cannot define member function %<%T::%s%> "
11756 : G_("cannot declare member function %<%T::%s%> "
11758 ctype
, name
, current_class_type
);
11759 return error_mark_node
;
11762 else if (typedef_p
&& current_class_type
)
11764 error ("cannot declare member %<%T::%s%> within %qT",
11765 ctype
, name
, current_class_type
);
11766 return error_mark_node
;
11770 if (ctype
== NULL_TREE
&& decl_context
== FIELD
&& friendp
== 0)
11771 ctype
= current_class_type
;
11773 /* Now TYPE has the actual type. */
11775 if (returned_attrs
)
11778 *attrlist
= chainon (returned_attrs
, *attrlist
);
11780 attrlist
= &returned_attrs
;
11784 && declarator
->kind
== cdk_id
11785 && declarator
->std_attributes
11786 && attrlist
!= NULL
)
11788 /* [dcl.meaning]/1: The optional attribute-specifier-seq following
11789 a declarator-id appertains to the entity that is declared. */
11790 if (declarator
->std_attributes
!= error_mark_node
)
11791 *attrlist
= chainon (*attrlist
, declarator
->std_attributes
);
11793 /* We should have already diagnosed the issue (c++/78344). */
11794 gcc_assert (seen_error ());
11797 /* Handle parameter packs. */
11798 if (parameter_pack_p
)
11800 if (decl_context
== PARM
)
11801 /* Turn the type into a pack expansion.*/
11802 type
= make_pack_expansion (type
);
11804 error ("non-parameter %qs cannot be a parameter pack", name
);
11807 if ((decl_context
== FIELD
|| decl_context
== PARM
)
11808 && !processing_template_decl
11809 && variably_modified_type_p (type
, NULL_TREE
))
11811 if (decl_context
== FIELD
)
11812 error ("data member may not have variably modified type %qT", type
);
11814 error ("parameter may not have variably modified type %qT", type
);
11815 type
= error_mark_node
;
11818 if (explicitp
== 1 || (explicitp
&& friendp
))
11820 /* [dcl.fct.spec] (C++11) The explicit specifier shall be used only
11821 in the declaration of a constructor or conversion function within
11822 a class definition. */
11823 if (!current_class_type
)
11824 error_at (declspecs
->locations
[ds_explicit
],
11825 "%<explicit%> outside class declaration");
11827 error_at (declspecs
->locations
[ds_explicit
],
11828 "%<explicit%> in friend declaration");
11830 error_at (declspecs
->locations
[ds_explicit
],
11831 "only declarations of constructors and conversion operators "
11832 "can be %<explicit%>");
11836 if (storage_class
== sc_mutable
)
11838 if (decl_context
!= FIELD
|| friendp
)
11840 error ("non-member %qs cannot be declared %<mutable%>", name
);
11841 storage_class
= sc_none
;
11843 else if (decl_context
== TYPENAME
|| typedef_p
)
11845 error ("non-object member %qs cannot be declared %<mutable%>", name
);
11846 storage_class
= sc_none
;
11848 else if (TREE_CODE (type
) == FUNCTION_TYPE
11849 || TREE_CODE (type
) == METHOD_TYPE
)
11851 error ("function %qs cannot be declared %<mutable%>", name
);
11852 storage_class
= sc_none
;
11856 error ("static %qs cannot be declared %<mutable%>", name
);
11857 storage_class
= sc_none
;
11859 else if (type_quals
& TYPE_QUAL_CONST
)
11861 error ("const %qs cannot be declared %<mutable%>", name
);
11862 storage_class
= sc_none
;
11864 else if (TYPE_REF_P (type
))
11866 permerror (input_location
, "reference %qs cannot be declared "
11867 "%<mutable%>", name
);
11868 storage_class
= sc_none
;
11872 /* If this is declaring a typedef name, return a TYPE_DECL. */
11873 if (typedef_p
&& decl_context
!= TYPENAME
)
11877 /* This declaration:
11879 typedef void f(int) const;
11881 declares a function type which is not a member of any
11882 particular class, but which is cv-qualified; for
11883 example "f S::*" declares a pointer to a const-qualified
11884 member function of S. We record the cv-qualification in the
11886 if ((rqual
|| memfn_quals
) && TREE_CODE (type
) == FUNCTION_TYPE
)
11888 type
= apply_memfn_quals (type
, memfn_quals
, rqual
);
11890 /* We have now dealt with these qualifiers. */
11891 memfn_quals
= TYPE_UNQUALIFIED
;
11892 rqual
= REF_QUAL_NONE
;
11895 if (type_uses_auto (type
))
11897 error ("typedef declared %<auto%>");
11898 type
= error_mark_node
;
11902 error_at (location_of (reqs
), "requires-clause on typedef");
11904 if (id_declarator
&& declarator
->u
.id
.qualifying_scope
)
11906 error ("typedef name may not be a nested-name-specifier");
11907 type
= error_mark_node
;
11910 if (decl_context
== FIELD
)
11911 decl
= build_lang_decl (TYPE_DECL
, unqualified_id
, type
);
11913 decl
= build_decl (input_location
, TYPE_DECL
, unqualified_id
, type
);
11915 if (decl_context
!= FIELD
)
11917 if (!current_function_decl
)
11918 DECL_CONTEXT (decl
) = FROB_CONTEXT (current_namespace
);
11919 else if (DECL_MAYBE_IN_CHARGE_CDTOR_P (current_function_decl
))
11920 /* The TYPE_DECL is "abstract" because there will be
11921 clones of this constructor/destructor, and there will
11922 be copies of this TYPE_DECL generated in those
11923 clones. The decloning optimization (for space) may
11924 revert this subsequently if it determines that
11925 the clones should share a common implementation. */
11926 DECL_ABSTRACT_P (decl
) = true;
11928 else if (current_class_type
11929 && constructor_name_p (unqualified_id
, current_class_type
))
11930 permerror (input_location
, "ISO C++ forbids nested type %qD with same name "
11931 "as enclosing class",
11934 /* If the user declares "typedef struct {...} foo" then the
11935 struct will have an anonymous name. Fill that name in now.
11936 Nothing can refer to it, so nothing needs know about the name
11938 if (type
!= error_mark_node
11940 && TYPE_NAME (type
)
11941 && TREE_CODE (TYPE_NAME (type
)) == TYPE_DECL
11942 && TYPE_UNNAMED_P (type
)
11943 && declspecs
->type_definition_p
11944 && attributes_naming_typedef_ok (*attrlist
)
11945 && cp_type_quals (type
) == TYPE_UNQUALIFIED
)
11946 name_unnamed_type (type
, decl
);
11949 || (typedef_decl
&& C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
)))
11950 C_TYPEDEF_EXPLICITLY_SIGNED (decl
) = 1;
11952 bad_specifiers (decl
, BSP_TYPE
, virtualp
,
11953 memfn_quals
!= TYPE_UNQUALIFIED
,
11954 inlinep
, friendp
, raises
!= NULL_TREE
,
11955 declspecs
->locations
);
11957 if (decl_spec_seq_has_spec_p (declspecs
, ds_alias
))
11958 /* Acknowledge that this was written:
11959 `using analias = atype;'. */
11960 TYPE_DECL_ALIAS_P (decl
) = 1;
11965 /* Detect the case of an array type of unspecified size
11966 which came, as such, direct from a typedef name.
11967 We must copy the type, so that the array's domain can be
11968 individually set by the object's initializer. */
11970 if (type
&& typedef_type
11971 && TREE_CODE (type
) == ARRAY_TYPE
&& !TYPE_DOMAIN (type
)
11972 && TYPE_MAIN_VARIANT (type
) == TYPE_MAIN_VARIANT (typedef_type
))
11973 type
= build_cplus_array_type (TREE_TYPE (type
), NULL_TREE
);
11975 /* Detect where we're using a typedef of function type to declare a
11976 function. PARMS will not be set, so we must create it now. */
11978 if (type
== typedef_type
&& TREE_CODE (type
) == FUNCTION_TYPE
)
11980 tree decls
= NULL_TREE
;
11983 for (args
= TYPE_ARG_TYPES (type
);
11984 args
&& args
!= void_list_node
;
11985 args
= TREE_CHAIN (args
))
11987 tree decl
= cp_build_parm_decl (NULL_TREE
, NULL_TREE
,
11988 TREE_VALUE (args
));
11990 DECL_CHAIN (decl
) = decls
;
11994 parms
= nreverse (decls
);
11996 if (decl_context
!= TYPENAME
)
11998 /* The qualifiers on the function type become the qualifiers on
11999 the non-static member function. */
12000 memfn_quals
|= type_memfn_quals (type
);
12001 rqual
= type_memfn_rqual (type
);
12002 type_quals
= TYPE_UNQUALIFIED
;
12006 /* If this is a type name (such as, in a cast or sizeof),
12007 compute the type and return it now. */
12009 if (decl_context
== TYPENAME
)
12011 /* Note that here we don't care about type_quals. */
12013 /* Special case: "friend class foo" looks like a TYPENAME context. */
12018 error ("%<inline%> specified for friend class declaration");
12024 /* Don't allow friend declaration without a class-key. */
12025 if (TREE_CODE (type
) == TEMPLATE_TYPE_PARM
)
12026 permerror (input_location
, "template parameters cannot be friends");
12027 else if (TREE_CODE (type
) == TYPENAME_TYPE
)
12028 permerror (input_location
, "friend declaration requires class-key, "
12029 "i.e. %<friend class %T::%D%>",
12030 TYPE_CONTEXT (type
), TYPENAME_TYPE_FULLNAME (type
));
12032 permerror (input_location
, "friend declaration requires class-key, "
12033 "i.e. %<friend %#T%>",
12037 /* Only try to do this stuff if we didn't already give up. */
12038 if (type
!= integer_type_node
)
12040 /* A friendly class? */
12041 if (current_class_type
)
12042 make_friend_class (current_class_type
, TYPE_MAIN_VARIANT (type
),
12043 /*complain=*/true);
12045 error ("trying to make class %qT a friend of global scope",
12048 type
= void_type_node
;
12051 else if (memfn_quals
|| rqual
)
12053 if (ctype
== NULL_TREE
12054 && TREE_CODE (type
) == METHOD_TYPE
)
12055 ctype
= TYPE_METHOD_BASETYPE (type
);
12058 type
= build_memfn_type (type
, ctype
, memfn_quals
, rqual
);
12059 /* Core issue #547: need to allow this in template type args.
12060 Allow it in general in C++11 for alias-declarations. */
12061 else if ((template_type_arg
|| cxx_dialect
>= cxx11
)
12062 && TREE_CODE (type
) == FUNCTION_TYPE
)
12063 type
= apply_memfn_quals (type
, memfn_quals
, rqual
);
12065 error ("invalid qualifiers on non-member function type");
12069 error_at (location_of (reqs
), "requires-clause on type-id");
12073 else if (unqualified_id
== NULL_TREE
&& decl_context
!= PARM
12074 && decl_context
!= CATCHPARM
12075 && TREE_CODE (type
) != UNION_TYPE
12077 && innermost_code
!= cdk_decomp
)
12079 error ("abstract declarator %qT used as declaration", type
);
12080 return error_mark_node
;
12083 if (!FUNC_OR_METHOD_TYPE_P (type
))
12085 /* Only functions may be declared using an operator-function-id. */
12086 if (dname
&& IDENTIFIER_ANY_OP_P (dname
))
12088 error ("declaration of %qD as non-function", dname
);
12089 return error_mark_node
;
12093 error_at (location_of (reqs
),
12094 "requires-clause on declaration of non-function type %qT",
12098 /* We don't check parameter types here because we can emit a better
12099 error message later. */
12100 if (decl_context
!= PARM
)
12102 type
= check_var_type (unqualified_id
, type
);
12103 if (type
== error_mark_node
)
12104 return error_mark_node
;
12107 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
12108 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
12110 if (decl_context
== PARM
|| decl_context
== CATCHPARM
)
12112 if (ctype
|| in_namespace
)
12113 error ("cannot use %<::%> in parameter declaration");
12115 if (type_uses_auto (type
)
12116 && !(cxx_dialect
>= cxx17
&& template_parm_flag
))
12118 if (cxx_dialect
>= cxx14
)
12119 error ("%<auto%> parameter not permitted in this context");
12121 error ("parameter declared %<auto%>");
12122 type
= error_mark_node
;
12125 /* A parameter declared as an array of T is really a pointer to T.
12126 One declared as a function is really a pointer to a function.
12127 One declared as a member is really a pointer to member. */
12129 if (TREE_CODE (type
) == ARRAY_TYPE
)
12131 /* Transfer const-ness of array into that of type pointed to. */
12132 type
= build_pointer_type (TREE_TYPE (type
));
12133 type_quals
= TYPE_UNQUALIFIED
;
12134 array_parameter_p
= true;
12136 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
12137 type
= build_pointer_type (type
);
12140 if (ctype
&& TREE_CODE (type
) == FUNCTION_TYPE
&& staticp
< 2
12141 && !(identifier_p (unqualified_id
)
12142 && IDENTIFIER_NEWDEL_OP_P (unqualified_id
)))
12144 cp_cv_quals real_quals
= memfn_quals
;
12145 if (cxx_dialect
< cxx14
&& constexpr_p
12146 && sfk
!= sfk_constructor
&& sfk
!= sfk_destructor
)
12147 real_quals
|= TYPE_QUAL_CONST
;
12148 type
= build_memfn_type (type
, ctype
, real_quals
, rqual
);
12152 tree decl
= NULL_TREE
;
12154 if (decl_context
== PARM
)
12156 decl
= cp_build_parm_decl (NULL_TREE
, unqualified_id
, type
);
12157 DECL_ARRAY_PARAMETER_P (decl
) = array_parameter_p
;
12159 bad_specifiers (decl
, BSP_PARM
, virtualp
,
12160 memfn_quals
!= TYPE_UNQUALIFIED
,
12161 inlinep
, friendp
, raises
!= NULL_TREE
,
12162 declspecs
->locations
);
12164 else if (decl_context
== FIELD
)
12166 if (!staticp
&& !friendp
&& TREE_CODE (type
) != METHOD_TYPE
)
12167 if (tree auto_node
= type_uses_auto (type
))
12169 location_t loc
= declspecs
->locations
[ds_type_spec
];
12170 if (CLASS_PLACEHOLDER_TEMPLATE (auto_node
))
12171 error_at (loc
, "invalid use of template-name %qE without an "
12173 CLASS_PLACEHOLDER_TEMPLATE (auto_node
));
12175 error_at (loc
, "non-static data member declared with "
12176 "placeholder %qT", auto_node
);
12177 type
= error_mark_node
;
12180 /* The C99 flexible array extension. */
12181 if (!staticp
&& TREE_CODE (type
) == ARRAY_TYPE
12182 && TYPE_DOMAIN (type
) == NULL_TREE
)
12185 && (TREE_CODE (ctype
) == UNION_TYPE
12186 || TREE_CODE (ctype
) == QUAL_UNION_TYPE
))
12188 error ("flexible array member in union");
12189 type
= error_mark_node
;
12193 /* Array is a flexible member. */
12194 if (in_system_header_at (input_location
))
12195 /* Do not warn on flexible array members in system
12196 headers because glibc uses them. */;
12198 pedwarn (input_location
, OPT_Wpedantic
,
12199 "ISO C++ forbids flexible array member %qs", name
);
12201 pedwarn (input_location
, OPT_Wpedantic
,
12202 "ISO C++ forbids flexible array members");
12204 /* Flexible array member has a null domain. */
12205 type
= build_cplus_array_type (TREE_TYPE (type
), NULL_TREE
);
12209 if (type
== error_mark_node
)
12211 /* Happens when declaring arrays of sizes which
12212 are error_mark_node, for example. */
12215 else if (in_namespace
&& !friendp
)
12217 /* Something like struct S { int N::j; }; */
12218 error ("invalid use of %<::%>");
12219 return error_mark_node
;
12221 else if (TREE_CODE (type
) == FUNCTION_TYPE
12222 || TREE_CODE (type
) == METHOD_TYPE
)
12225 tree function_context
;
12229 /* This should never happen in pure C++ (the check
12230 could be an assert). It could happen in
12231 Objective-C++ if someone writes invalid code that
12232 uses a function declaration for an instance
12233 variable or property (instance variables and
12234 properties are parsed as FIELD_DECLs, but they are
12235 part of an Objective-C class, not a C++ class).
12236 That code is invalid and is caught by this
12240 error ("declaration of function %qD in invalid context",
12242 return error_mark_node
;
12245 /* ``A union may [ ... ] not [ have ] virtual functions.''
12247 if (virtualp
&& TREE_CODE (ctype
) == UNION_TYPE
)
12249 error_at (declspecs
->locations
[ds_virtual
],
12250 "function %qD declared %<virtual%> inside a union",
12252 return error_mark_node
;
12256 && identifier_p (unqualified_id
)
12257 && IDENTIFIER_NEWDEL_OP_P (unqualified_id
))
12259 error_at (declspecs
->locations
[ds_virtual
],
12260 "%qD cannot be declared %<virtual%>, since it "
12261 "is always static", unqualified_id
);
12266 /* Check that the name used for a destructor makes sense. */
12267 if (sfk
== sfk_destructor
)
12269 tree uqname
= id_declarator
->u
.id
.unqualified_name
;
12273 gcc_assert (friendp
);
12274 error ("expected qualified name in friend declaration "
12275 "for destructor %qD", uqname
);
12276 return error_mark_node
;
12279 if (!check_dtor_name (ctype
, TREE_OPERAND (uqname
, 0)))
12281 error ("declaration of %qD as member of %qT",
12283 return error_mark_node
;
12287 error_at (declspecs
->locations
[ds_concept
],
12288 "a destructor cannot be %<concept%>");
12289 return error_mark_node
;
12293 error_at (declspecs
->locations
[ds_constexpr
],
12294 "a destructor cannot be %<constexpr%>");
12295 return error_mark_node
;
12298 else if (sfk
== sfk_constructor
&& friendp
&& !ctype
)
12300 error ("expected qualified name in friend declaration "
12301 "for constructor %qD",
12302 id_declarator
->u
.id
.unqualified_name
);
12303 return error_mark_node
;
12305 if (sfk
== sfk_constructor
)
12308 error_at (declspecs
->locations
[ds_concept
],
12309 "a constructor cannot be %<concept%>");
12310 return error_mark_node
;
12314 error_at (declspecs
->locations
[ds_concept
],
12315 "a concept cannot be a member function");
12319 if (TREE_CODE (unqualified_id
) == TEMPLATE_ID_EXPR
)
12321 tree tmpl
= TREE_OPERAND (unqualified_id
, 0);
12322 if (variable_template_p (tmpl
))
12324 error ("specialization of variable template %qD "
12325 "declared as function", tmpl
);
12326 inform (DECL_SOURCE_LOCATION (tmpl
),
12327 "variable template declared here");
12328 return error_mark_node
;
12332 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
12333 function_context
= (ctype
!= NULL_TREE
) ?
12334 decl_function_context (TYPE_MAIN_DECL (ctype
)) : NULL_TREE
;
12335 publicp
= (! friendp
|| ! staticp
)
12336 && function_context
== NULL_TREE
;
12338 decl
= grokfndecl (ctype
, type
,
12339 TREE_CODE (unqualified_id
) != TEMPLATE_ID_EXPR
12340 ? unqualified_id
: dname
,
12345 virtualp
, flags
, memfn_quals
, rqual
, raises
,
12346 friendp
? -1 : 0, friendp
, publicp
,
12347 inlinep
| (2 * constexpr_p
) | (4 * concept_p
),
12348 initialized
== SD_DELETED
, sfk
,
12349 funcdef_flag
, late_return_type_p
,
12350 template_count
, in_namespace
,
12351 attrlist
, declarator
->id_loc
);
12352 decl
= set_virt_specifiers (decl
, virt_specifiers
);
12353 if (decl
== NULL_TREE
)
12354 return error_mark_node
;
12356 /* This clobbers the attrs stored in `decl' from `attrlist'. */
12357 /* The decl and setting of decl_attr is also turned off. */
12358 decl
= build_decl_attribute_variant (decl
, decl_attr
);
12361 /* [class.conv.ctor]
12363 A constructor declared without the function-specifier
12364 explicit that can be called with a single parameter
12365 specifies a conversion from the type of its first
12366 parameter to the type of its class. Such a constructor
12367 is called a converting constructor. */
12368 if (explicitp
== 2)
12369 DECL_NONCONVERTING_P (decl
) = 1;
12371 else if (!staticp
&& !dependent_type_p (type
)
12372 && !COMPLETE_TYPE_P (complete_type (type
))
12373 && (!complete_or_array_type_p (type
)
12374 || initialized
== 0))
12376 if (TREE_CODE (type
) != ARRAY_TYPE
12377 || !COMPLETE_TYPE_P (TREE_TYPE (type
)))
12379 if (unqualified_id
)
12381 error ("field %qD has incomplete type %qT",
12382 unqualified_id
, type
);
12383 cxx_incomplete_type_inform (strip_array_types (type
));
12386 error ("name %qT has incomplete type", type
);
12388 type
= error_mark_node
;
12396 error ("%qE is neither function nor member function; "
12397 "cannot be declared friend", unqualified_id
);
12398 return error_mark_node
;
12405 /* Friends are treated specially. */
12406 if (ctype
== current_class_type
)
12407 ; /* We already issued a permerror. */
12408 else if (decl
&& DECL_NAME (decl
))
12410 if (template_class_depth (current_class_type
) == 0)
12412 decl
= check_explicit_specialization
12413 (unqualified_id
, decl
, template_count
,
12414 2 * funcdef_flag
+ 4);
12415 if (decl
== error_mark_node
)
12416 return error_mark_node
;
12419 decl
= do_friend (ctype
, unqualified_id
, decl
,
12425 return error_mark_node
;
12428 /* Structure field. It may not be a function, except for C++. */
12430 if (decl
== NULL_TREE
)
12434 /* C++ allows static class members. All other work
12435 for this is done by grokfield. */
12436 decl
= build_lang_decl_loc (declarator
12437 ? declarator
->id_loc
12439 VAR_DECL
, unqualified_id
, type
);
12440 set_linkage_for_static_data_member (decl
);
12442 error_at (declspecs
->locations
[ds_concept
],
12443 "static data member %qE declared %<concept%>",
12445 else if (constexpr_p
&& !initialized
)
12447 error ("%<constexpr%> static data member %qD must have an "
12448 "initializer", decl
);
12449 constexpr_p
= false;
12453 mark_inline_variable (decl
, declspecs
->locations
[ds_inline
]);
12455 if (!DECL_VAR_DECLARED_INLINE_P (decl
)
12456 && !(cxx_dialect
>= cxx17
&& constexpr_p
))
12457 /* Even if there is an in-class initialization, DECL
12458 is considered undefined until an out-of-class
12459 definition is provided, unless this is an inline
12461 DECL_EXTERNAL (decl
) = 1;
12465 CP_DECL_THREAD_LOCAL_P (decl
) = true;
12466 if (!processing_template_decl
)
12467 set_decl_tls_model (decl
, decl_default_tls_model (decl
));
12468 if (declspecs
->gnu_thread_keyword_p
)
12469 SET_DECL_GNU_TLS_P (decl
);
12475 error_at (declspecs
->locations
[ds_concept
],
12476 "non-static data member %qE declared %<concept%>",
12478 else if (constexpr_p
)
12480 error_at (declspecs
->locations
[ds_constexpr
],
12481 "non-static data member %qE declared %<constexpr%>",
12483 constexpr_p
= false;
12485 decl
= build_decl (input_location
,
12486 FIELD_DECL
, unqualified_id
, type
);
12487 DECL_NONADDRESSABLE_P (decl
) = bitfield
;
12488 if (bitfield
&& !unqualified_id
)
12490 TREE_NO_WARNING (decl
) = 1;
12491 DECL_PADDING_P (decl
) = 1;
12494 if (storage_class
== sc_mutable
)
12496 DECL_MUTABLE_P (decl
) = 1;
12497 storage_class
= sc_none
;
12502 /* An attempt is being made to initialize a non-static
12503 member. This is new in C++11. */
12504 maybe_warn_cpp0x (CPP0X_NSDMI
);
12506 /* If this has been parsed with static storage class, but
12507 errors forced staticp to be cleared, ensure NSDMI is
12509 if (declspecs
->storage_class
== sc_static
)
12510 DECL_INITIAL (decl
) = error_mark_node
;
12514 bad_specifiers (decl
, BSP_FIELD
, virtualp
,
12515 memfn_quals
!= TYPE_UNQUALIFIED
,
12516 staticp
? false : inlinep
, friendp
,
12517 raises
!= NULL_TREE
,
12518 declspecs
->locations
);
12521 else if (TREE_CODE (type
) == FUNCTION_TYPE
12522 || TREE_CODE (type
) == METHOD_TYPE
)
12524 tree original_name
;
12527 if (!unqualified_id
)
12528 return error_mark_node
;
12530 if (TREE_CODE (unqualified_id
) == TEMPLATE_ID_EXPR
)
12531 original_name
= dname
;
12533 original_name
= unqualified_id
;
12534 // FIXME:gcc_assert (original_name == dname);
12536 if (storage_class
== sc_auto
)
12537 error ("storage class %<auto%> invalid for function %qs", name
);
12538 else if (storage_class
== sc_register
)
12539 error ("storage class %<register%> invalid for function %qs", name
);
12542 if (declspecs
->gnu_thread_keyword_p
)
12543 error_at (declspecs
->locations
[ds_thread
],
12544 "storage class %<__thread%> invalid for function %qs",
12547 error_at (declspecs
->locations
[ds_thread
],
12548 "storage class %<thread_local%> invalid for "
12549 "function %qs", name
);
12552 if (virt_specifiers
)
12553 error ("virt-specifiers in %qs not allowed outside a class "
12554 "definition", name
);
12555 /* Function declaration not at top level.
12556 Storage classes other than `extern' are not allowed
12557 and `extern' makes no difference. */
12558 if (! toplevel_bindings_p ()
12559 && (storage_class
== sc_static
12560 || decl_spec_seq_has_spec_p (declspecs
, ds_inline
))
12563 if (storage_class
== sc_static
)
12564 pedwarn (declspecs
->locations
[ds_storage_class
], OPT_Wpedantic
,
12565 "%<static%> specifier invalid for function %qs "
12566 "declared out of global scope", name
);
12568 pedwarn (declspecs
->locations
[ds_inline
], OPT_Wpedantic
,
12569 "%<inline%> specifier invalid for function %qs "
12570 "declared out of global scope", name
);
12573 if (ctype
== NULL_TREE
)
12577 error ("virtual non-class function %qs", name
);
12580 else if (sfk
== sfk_constructor
12581 || sfk
== sfk_destructor
)
12583 error (funcdef_flag
12584 ? G_("%qs defined in a non-class scope")
12585 : G_("%qs declared in a non-class scope"), name
);
12590 /* Record whether the function is public. */
12591 publicp
= (ctype
!= NULL_TREE
12592 || storage_class
!= sc_static
);
12594 decl
= grokfndecl (ctype
, type
, original_name
, parms
, unqualified_id
,
12596 reqs
, virtualp
, flags
, memfn_quals
, rqual
, raises
,
12599 inlinep
| (2 * constexpr_p
) | (4 * concept_p
),
12600 initialized
== SD_DELETED
,
12603 late_return_type_p
,
12604 template_count
, in_namespace
, attrlist
,
12605 declarator
->id_loc
);
12606 if (decl
== NULL_TREE
)
12607 return error_mark_node
;
12609 if (explicitp
== 2)
12610 DECL_NONCONVERTING_P (decl
) = 1;
12613 int invalid_static
= 0;
12615 /* Don't allow a static member function in a class, and forbid
12616 declaring main to be static. */
12617 if (TREE_CODE (type
) == METHOD_TYPE
)
12619 permerror (input_location
, "cannot declare member function %qD to have "
12620 "static linkage", decl
);
12621 invalid_static
= 1;
12623 else if (current_function_decl
)
12625 /* 7.1.1: There can be no static function declarations within a
12627 error_at (declspecs
->locations
[ds_storage_class
],
12628 "cannot declare static function inside another function");
12629 invalid_static
= 1;
12632 if (invalid_static
)
12635 storage_class
= sc_none
;
12641 /* It's a variable. */
12643 /* An uninitialized decl with `extern' is a reference. */
12644 decl
= grokvardecl (type
, dname
, unqualified_id
,
12651 ctype
? ctype
: in_namespace
);
12652 if (decl
== NULL_TREE
)
12653 return error_mark_node
;
12655 bad_specifiers (decl
, BSP_VAR
, virtualp
,
12656 memfn_quals
!= TYPE_UNQUALIFIED
,
12657 inlinep
, friendp
, raises
!= NULL_TREE
,
12658 declspecs
->locations
);
12662 DECL_CONTEXT (decl
) = ctype
;
12665 permerror (input_location
, "%<static%> may not be used when defining "
12666 "(as opposed to declaring) a static data member");
12668 storage_class
= sc_none
;
12670 if (storage_class
== sc_register
&& TREE_STATIC (decl
))
12672 error ("static member %qD declared %<register%>", decl
);
12673 storage_class
= sc_none
;
12675 if (storage_class
== sc_extern
&& pedantic
)
12677 pedwarn (input_location
, OPT_Wpedantic
,
12678 "cannot explicitly declare member %q#D to have "
12679 "extern linkage", decl
);
12680 storage_class
= sc_none
;
12683 else if (constexpr_p
&& DECL_EXTERNAL (decl
))
12685 error ("declaration of %<constexpr%> variable %qD "
12686 "is not a definition", decl
);
12687 constexpr_p
= false;
12691 mark_inline_variable (decl
, declspecs
->locations
[ds_inline
]);
12692 if (innermost_code
== cdk_decomp
)
12694 gcc_assert (declarator
&& declarator
->kind
== cdk_decomp
);
12695 DECL_SOURCE_LOCATION (decl
) = declarator
->id_loc
;
12696 DECL_ARTIFICIAL (decl
) = 1;
12697 fit_decomposition_lang_decl (decl
, NULL_TREE
);
12701 if (VAR_P (decl
) && !initialized
)
12702 if (tree auto_node
= type_uses_auto (type
))
12703 if (!CLASS_PLACEHOLDER_TEMPLATE (auto_node
))
12705 location_t loc
= declspecs
->locations
[ds_type_spec
];
12706 error_at (loc
, "declaration of %q#D has no initializer", decl
);
12707 TREE_TYPE (decl
) = error_mark_node
;
12710 if (storage_class
== sc_extern
&& initialized
&& !funcdef_flag
)
12712 if (toplevel_bindings_p ())
12714 /* It's common practice (and completely valid) to have a const
12715 be initialized and declared extern. */
12716 if (!(type_quals
& TYPE_QUAL_CONST
))
12717 warning (0, "%qs initialized and declared %<extern%>", name
);
12721 error ("%qs has both %<extern%> and initializer", name
);
12722 return error_mark_node
;
12726 /* Record `register' declaration for warnings on &
12727 and in case doing stupid register allocation. */
12729 if (storage_class
== sc_register
)
12731 DECL_REGISTER (decl
) = 1;
12732 /* Warn about register storage specifiers on PARM_DECLs. */
12733 if (TREE_CODE (decl
) == PARM_DECL
)
12735 if (cxx_dialect
>= cxx17
)
12736 pedwarn (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
12737 "ISO C++17 does not allow %<register%> storage "
12738 "class specifier");
12740 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
12741 "%<register%> storage class specifier used");
12744 else if (storage_class
== sc_extern
)
12745 DECL_THIS_EXTERN (decl
) = 1;
12746 else if (storage_class
== sc_static
)
12747 DECL_THIS_STATIC (decl
) = 1;
12749 /* Set constexpr flag on vars (functions got it in grokfndecl). */
12750 if (constexpr_p
&& VAR_P (decl
))
12751 DECL_DECLARED_CONSTEXPR_P (decl
) = true;
12753 /* Record constancy and volatility on the DECL itself . There's
12754 no need to do this when processing a template; we'll do this
12755 for the instantiated declaration based on the type of DECL. */
12756 if (!processing_template_decl
)
12757 cp_apply_type_quals_to_decl (type_quals
, decl
);
12763 /* Subroutine of start_function. Ensure that each of the parameter
12764 types (as listed in PARMS) is complete, as is required for a
12765 function definition. */
12768 require_complete_types_for_parms (tree parms
)
12770 for (; parms
; parms
= DECL_CHAIN (parms
))
12772 if (dependent_type_p (TREE_TYPE (parms
)))
12774 if (!VOID_TYPE_P (TREE_TYPE (parms
))
12775 && complete_type_or_else (TREE_TYPE (parms
), parms
))
12777 relayout_decl (parms
);
12778 DECL_ARG_TYPE (parms
) = type_passed_as (TREE_TYPE (parms
));
12780 maybe_warn_parm_abi (TREE_TYPE (parms
),
12781 DECL_SOURCE_LOCATION (parms
));
12784 /* grokparms or complete_type_or_else will have already issued
12786 TREE_TYPE (parms
) = error_mark_node
;
12790 /* Returns nonzero if T is a local variable. */
12793 local_variable_p (const_tree t
)
12796 /* A VAR_DECL with a context that is a _TYPE is a static data
12798 && !TYPE_P (CP_DECL_CONTEXT (t
))
12799 /* Any other non-local variable must be at namespace scope. */
12800 && !DECL_NAMESPACE_SCOPE_P (t
))
12801 || (TREE_CODE (t
) == PARM_DECL
))
12807 /* Like local_variable_p, but suitable for use as a tree-walking
12811 local_variable_p_walkfn (tree
*tp
, int *walk_subtrees
,
12814 if (local_variable_p (*tp
)
12815 && (!DECL_ARTIFICIAL (*tp
) || DECL_NAME (*tp
) == this_identifier
))
12817 else if (TYPE_P (*tp
))
12818 *walk_subtrees
= 0;
12823 /* Check that ARG, which is a default-argument expression for a
12824 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
12825 something goes wrong. DECL may also be a _TYPE node, rather than a
12826 DECL, if there is no DECL available. */
12829 check_default_argument (tree decl
, tree arg
, tsubst_flags_t complain
)
12834 if (TREE_CODE (arg
) == DEFAULT_ARG
)
12835 /* We get a DEFAULT_ARG when looking at an in-class declaration
12836 with a default argument. Ignore the argument for now; we'll
12837 deal with it after the class is complete. */
12846 decl_type
= TREE_TYPE (decl
);
12848 if (arg
== error_mark_node
12849 || decl
== error_mark_node
12850 || TREE_TYPE (arg
) == error_mark_node
12851 || decl_type
== error_mark_node
)
12852 /* Something already went wrong. There's no need to check
12854 return error_mark_node
;
12856 /* [dcl.fct.default]
12858 A default argument expression is implicitly converted to the
12860 ++cp_unevaluated_operand
;
12861 /* Avoid digest_init clobbering the initializer. */
12862 tree carg
= BRACE_ENCLOSED_INITIALIZER_P (arg
) ? unshare_expr (arg
): arg
;
12863 perform_implicit_conversion_flags (decl_type
, carg
, complain
,
12865 --cp_unevaluated_operand
;
12867 /* Avoid redundant -Wzero-as-null-pointer-constant warnings at
12869 if (TYPE_PTR_OR_PTRMEM_P (decl_type
)
12870 && null_ptr_cst_p (arg
))
12871 return nullptr_node
;
12873 /* [dcl.fct.default]
12875 Local variables shall not be used in default argument
12878 The keyword `this' shall not be used in a default argument of a
12879 member function. */
12880 var
= cp_walk_tree_without_duplicates (&arg
, local_variable_p_walkfn
, NULL
);
12883 if (complain
& tf_warning_or_error
)
12885 if (DECL_NAME (var
) == this_identifier
)
12886 permerror (input_location
, "default argument %qE uses %qD",
12889 error ("default argument %qE uses local variable %qD", arg
, var
);
12891 return error_mark_node
;
12898 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
12901 type_is_deprecated (tree type
)
12903 enum tree_code code
;
12904 if (TREE_DEPRECATED (type
))
12906 if (TYPE_NAME (type
))
12908 if (TREE_DEPRECATED (TYPE_NAME (type
)))
12914 /* Do warn about using typedefs to a deprecated class. */
12915 if (OVERLOAD_TYPE_P (type
) && type
!= TYPE_MAIN_VARIANT (type
))
12916 return type_is_deprecated (TYPE_MAIN_VARIANT (type
));
12918 code
= TREE_CODE (type
);
12920 if (code
== POINTER_TYPE
|| code
== REFERENCE_TYPE
12921 || code
== OFFSET_TYPE
|| code
== FUNCTION_TYPE
12922 || code
== METHOD_TYPE
|| code
== ARRAY_TYPE
)
12923 return type_is_deprecated (TREE_TYPE (type
));
12925 if (TYPE_PTRMEMFUNC_P (type
))
12926 return type_is_deprecated
12927 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type
))));
12932 /* Decode the list of parameter types for a function type.
12933 Given the list of things declared inside the parens,
12934 return a list of types.
12936 If this parameter does not end with an ellipsis, we append
12939 *PARMS is set to the chain of PARM_DECLs created. */
12942 grokparms (tree parmlist
, tree
*parms
)
12944 tree result
= NULL_TREE
;
12945 tree decls
= NULL_TREE
;
12949 for (parm
= parmlist
; parm
!= NULL_TREE
; parm
= TREE_CHAIN (parm
))
12951 tree type
= NULL_TREE
;
12952 tree init
= TREE_PURPOSE (parm
);
12953 tree decl
= TREE_VALUE (parm
);
12955 if (parm
== void_list_node
)
12958 if (! decl
|| TREE_TYPE (decl
) == error_mark_node
)
12961 type
= TREE_TYPE (decl
);
12962 if (VOID_TYPE_P (type
))
12964 if (same_type_p (type
, void_type_node
)
12966 && !DECL_NAME (decl
) && !result
12967 && TREE_CHAIN (parm
) == void_list_node
)
12968 /* DR 577: A parameter list consisting of a single
12969 unnamed parameter of non-dependent type 'void'. */
12971 else if (cv_qualified_p (type
))
12972 error_at (DECL_SOURCE_LOCATION (decl
),
12973 "invalid use of cv-qualified type %qT in "
12974 "parameter declaration", type
);
12976 error_at (DECL_SOURCE_LOCATION (decl
),
12977 "invalid use of type %<void%> in parameter "
12979 /* It's not a good idea to actually create parameters of
12980 type `void'; other parts of the compiler assume that a
12981 void type terminates the parameter list. */
12982 type
= error_mark_node
;
12983 TREE_TYPE (decl
) = error_mark_node
;
12986 if (type
!= error_mark_node
)
12988 if (deprecated_state
!= DEPRECATED_SUPPRESS
)
12990 tree deptype
= type_is_deprecated (type
);
12992 cp_warn_deprecated_use (deptype
);
12995 /* Top-level qualifiers on the parameters are
12996 ignored for function types. */
12997 type
= cp_build_qualified_type (type
, 0);
12998 if (TREE_CODE (type
) == METHOD_TYPE
)
13000 error ("parameter %qD invalidly declared method type", decl
);
13001 type
= build_pointer_type (type
);
13002 TREE_TYPE (decl
) = type
;
13004 else if (abstract_virtuals_error (decl
, type
))
13005 any_error
= 1; /* Seems like a good idea. */
13006 else if (cxx_dialect
< cxx17
&& INDIRECT_TYPE_P (type
))
13008 /* Before C++17 DR 393:
13009 [dcl.fct]/6, parameter types cannot contain pointers
13010 (references) to arrays of unknown bound. */
13011 tree t
= TREE_TYPE (type
);
13012 int ptr
= TYPE_PTR_P (type
);
13016 if (TYPE_PTR_P (t
))
13018 else if (TREE_CODE (t
) != ARRAY_TYPE
)
13020 else if (!TYPE_DOMAIN (t
))
13024 if (TREE_CODE (t
) == ARRAY_TYPE
)
13025 pedwarn (DECL_SOURCE_LOCATION (decl
), OPT_Wpedantic
,
13027 ? G_("parameter %qD includes pointer to array of "
13028 "unknown bound %qT")
13029 : G_("parameter %qD includes reference to array of "
13030 "unknown bound %qT"),
13036 else if (init
&& !processing_template_decl
)
13037 init
= check_default_argument (decl
, init
, tf_warning_or_error
);
13040 DECL_CHAIN (decl
) = decls
;
13042 result
= tree_cons (init
, type
, result
);
13044 decls
= nreverse (decls
);
13045 result
= nreverse (result
);
13047 result
= chainon (result
, void_list_node
);
13054 /* D is a constructor or overloaded `operator='.
13056 Let T be the class in which D is declared. Then, this function
13059 -1 if D's is an ill-formed constructor or copy assignment operator
13060 whose first parameter is of type `T'.
13061 0 if D is not a copy constructor or copy assignment
13063 1 if D is a copy constructor or copy assignment operator whose
13064 first parameter is a reference to non-const qualified T.
13065 2 if D is a copy constructor or copy assignment operator whose
13066 first parameter is a reference to const qualified T.
13068 This function can be used as a predicate. Positive values indicate
13069 a copy constructor and nonzero values indicate a copy assignment
13073 copy_fn_p (const_tree d
)
13079 gcc_assert (DECL_FUNCTION_MEMBER_P (d
));
13081 if (TREE_CODE (d
) == TEMPLATE_DECL
13082 || (DECL_TEMPLATE_INFO (d
)
13083 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d
))))
13084 /* Instantiations of template member functions are never copy
13085 functions. Note that member functions of templated classes are
13086 represented as template functions internally, and we must
13087 accept those as copy functions. */
13090 args
= FUNCTION_FIRST_USER_PARMTYPE (d
);
13094 arg_type
= TREE_VALUE (args
);
13095 if (arg_type
== error_mark_node
)
13098 if (TYPE_MAIN_VARIANT (arg_type
) == DECL_CONTEXT (d
))
13100 /* Pass by value copy assignment operator. */
13103 else if (TYPE_REF_P (arg_type
)
13104 && !TYPE_REF_IS_RVALUE (arg_type
)
13105 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type
)) == DECL_CONTEXT (d
))
13107 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type
)))
13113 args
= TREE_CHAIN (args
);
13115 if (args
&& args
!= void_list_node
&& !TREE_PURPOSE (args
))
13116 /* There are more non-optional args. */
13122 /* D is a constructor or overloaded `operator='.
13124 Let T be the class in which D is declared. Then, this function
13125 returns true when D is a move constructor or move assignment
13126 operator, false otherwise. */
13129 move_fn_p (const_tree d
)
13131 gcc_assert (DECL_FUNCTION_MEMBER_P (d
));
13133 if (cxx_dialect
== cxx98
)
13134 /* There are no move constructors if we are in C++98 mode. */
13137 if (TREE_CODE (d
) == TEMPLATE_DECL
13138 || (DECL_TEMPLATE_INFO (d
)
13139 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d
))))
13140 /* Instantiations of template member functions are never move
13141 functions. Note that member functions of templated classes are
13142 represented as template functions internally, and we must
13143 accept those as move functions. */
13146 return move_signature_fn_p (d
);
13149 /* D is a constructor or overloaded `operator='.
13151 Then, this function returns true when D has the same signature as a move
13152 constructor or move assignment operator (because either it is such a
13153 ctor/op= or it is a template specialization with the same signature),
13154 false otherwise. */
13157 move_signature_fn_p (const_tree d
)
13161 bool result
= false;
13163 args
= FUNCTION_FIRST_USER_PARMTYPE (d
);
13167 arg_type
= TREE_VALUE (args
);
13168 if (arg_type
== error_mark_node
)
13171 if (TYPE_REF_P (arg_type
)
13172 && TYPE_REF_IS_RVALUE (arg_type
)
13173 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type
)),
13177 args
= TREE_CHAIN (args
);
13179 if (args
&& args
!= void_list_node
&& !TREE_PURPOSE (args
))
13180 /* There are more non-optional args. */
13186 /* Remember any special properties of member function DECL. */
13189 grok_special_member_properties (tree decl
)
13193 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl
))
13196 class_type
= DECL_CONTEXT (decl
);
13197 if (IDENTIFIER_CTOR_P (DECL_NAME (decl
)))
13199 int ctor
= copy_fn_p (decl
);
13201 if (!DECL_ARTIFICIAL (decl
))
13202 TYPE_HAS_USER_CONSTRUCTOR (class_type
) = 1;
13208 A non-template constructor for class X is a copy
13209 constructor if its first parameter is of type X&, const
13210 X&, volatile X& or const volatile X&, and either there
13211 are no other parameters or else all other parameters have
13212 default arguments. */
13213 TYPE_HAS_COPY_CTOR (class_type
) = 1;
13214 if (user_provided_p (decl
))
13215 TYPE_HAS_COMPLEX_COPY_CTOR (class_type
) = 1;
13217 TYPE_HAS_CONST_COPY_CTOR (class_type
) = 1;
13219 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl
)))
13220 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type
) = 1;
13221 else if (move_fn_p (decl
) && user_provided_p (decl
))
13222 TYPE_HAS_COMPLEX_MOVE_CTOR (class_type
) = 1;
13223 else if (is_list_ctor (decl
))
13224 TYPE_HAS_LIST_CTOR (class_type
) = 1;
13226 if (DECL_DECLARED_CONSTEXPR_P (decl
)
13227 && !ctor
&& !move_fn_p (decl
))
13228 TYPE_HAS_CONSTEXPR_CTOR (class_type
) = 1;
13230 else if (DECL_NAME (decl
) == assign_op_identifier
)
13234 A non-template assignment operator for class X is a copy
13235 assignment operator if its parameter is of type X, X&, const
13236 X&, volatile X& or const volatile X&. */
13238 int assop
= copy_fn_p (decl
);
13242 TYPE_HAS_COPY_ASSIGN (class_type
) = 1;
13243 if (user_provided_p (decl
))
13244 TYPE_HAS_COMPLEX_COPY_ASSIGN (class_type
) = 1;
13246 TYPE_HAS_CONST_COPY_ASSIGN (class_type
) = 1;
13248 else if (move_fn_p (decl
) && user_provided_p (decl
))
13249 TYPE_HAS_COMPLEX_MOVE_ASSIGN (class_type
) = 1;
13251 else if (IDENTIFIER_CONV_OP_P (DECL_NAME (decl
)))
13252 TYPE_HAS_CONVERSION (class_type
) = true;
13254 /* Destructors are handled in check_methods. */
13257 /* Check a constructor DECL has the correct form. Complains
13258 if the class has a constructor of the form X(X). */
13261 grok_ctor_properties (const_tree ctype
, const_tree decl
)
13263 int ctor_parm
= copy_fn_p (decl
);
13269 A declaration of a constructor for a class X is ill-formed if
13270 its first parameter is of type (optionally cv-qualified) X
13271 and either there are no other parameters or else all other
13272 parameters have default arguments.
13274 We *don't* complain about member template instantiations that
13275 have this form, though; they can occur as we try to decide
13276 what constructor to use during overload resolution. Since
13277 overload resolution will never prefer such a constructor to
13278 the non-template copy constructor (which is either explicitly
13279 or implicitly defined), there's no need to worry about their
13280 existence. Theoretically, they should never even be
13281 instantiated, but that's hard to forestall. */
13282 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
13290 /* DECL is a declaration for an overloaded or conversion operator. If
13291 COMPLAIN is true, errors are issued for invalid declarations. */
13294 grok_op_properties (tree decl
, bool complain
)
13296 tree argtypes
= TYPE_ARG_TYPES (TREE_TYPE (decl
));
13297 bool methodp
= TREE_CODE (TREE_TYPE (decl
)) == METHOD_TYPE
;
13298 tree name
= DECL_NAME (decl
);
13299 location_t loc
= DECL_SOURCE_LOCATION (decl
);
13301 tree class_type
= DECL_CONTEXT (decl
);
13302 if (class_type
&& !CLASS_TYPE_P (class_type
))
13303 class_type
= NULL_TREE
;
13305 tree_code operator_code
;
13307 if (IDENTIFIER_CONV_OP_P (name
))
13309 /* Conversion operators are TYPE_EXPR for the purposes of this
13311 operator_code
= TYPE_EXPR
;
13312 op_flags
= OVL_OP_FLAG_UNARY
;
13316 const ovl_op_info_t
*ovl_op
= IDENTIFIER_OVL_OP_INFO (name
);
13318 operator_code
= ovl_op
->tree_code
;
13319 op_flags
= ovl_op
->flags
;
13320 gcc_checking_assert (operator_code
!= ERROR_MARK
);
13321 DECL_OVERLOADED_OPERATOR_CODE_RAW (decl
) = ovl_op
->ovl_op_code
;
13324 if (op_flags
& OVL_OP_FLAG_ALLOC
)
13326 /* operator new and operator delete are quite special. */
13330 case OVL_OP_FLAG_ALLOC
:
13331 TYPE_HAS_NEW_OPERATOR (class_type
) = 1;
13334 case OVL_OP_FLAG_ALLOC
| OVL_OP_FLAG_DELETE
:
13335 TYPE_GETS_DELETE (class_type
) |= 1;
13338 case OVL_OP_FLAG_ALLOC
| OVL_OP_FLAG_VEC
:
13339 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type
) = 1;
13342 case OVL_OP_FLAG_ALLOC
| OVL_OP_FLAG_DELETE
| OVL_OP_FLAG_VEC
:
13343 TYPE_GETS_DELETE (class_type
) |= 2;
13347 gcc_unreachable ();
13350 /* [basic.std.dynamic.allocation]/1:
13352 A program is ill-formed if an allocation function is declared
13353 in a namespace scope other than global scope or declared
13354 static in global scope.
13356 The same also holds true for deallocation functions. */
13357 if (DECL_NAMESPACE_SCOPE_P (decl
))
13359 if (CP_DECL_CONTEXT (decl
) != global_namespace
)
13361 error_at (loc
, "%qD may not be declared within a namespace",
13366 if (!TREE_PUBLIC (decl
))
13368 error_at (loc
, "%qD may not be declared as static", decl
);
13373 if (op_flags
& OVL_OP_FLAG_DELETE
)
13374 TREE_TYPE (decl
) = coerce_delete_type (TREE_TYPE (decl
), loc
);
13377 DECL_IS_OPERATOR_NEW (decl
) = 1;
13378 TREE_TYPE (decl
) = coerce_new_type (TREE_TYPE (decl
), loc
);
13384 /* An operator function must either be a non-static member function
13385 or have at least one parameter of a class, a reference to a class,
13386 an enumeration, or a reference to an enumeration. 13.4.0.6 */
13387 if (! methodp
|| DECL_STATIC_FUNCTION_P (decl
))
13389 if (operator_code
== TYPE_EXPR
13390 || operator_code
== CALL_EXPR
13391 || operator_code
== COMPONENT_REF
13392 || operator_code
== ARRAY_REF
13393 || operator_code
== NOP_EXPR
)
13395 error_at (loc
, "%qD must be a nonstatic member function", decl
);
13399 if (DECL_STATIC_FUNCTION_P (decl
))
13401 error_at (loc
, "%qD must be either a non-static member "
13402 "function or a non-member function", decl
);
13406 for (tree arg
= argtypes
; ; arg
= TREE_CHAIN (arg
))
13408 if (!arg
|| arg
== void_list_node
)
13411 error_at(loc
, "%qD must have an argument of class or "
13412 "enumerated type", decl
);
13416 tree type
= non_reference (TREE_VALUE (arg
));
13417 if (type
== error_mark_node
)
13420 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
13421 because these checks are performed even on template
13423 if (MAYBE_CLASS_TYPE_P (type
)
13424 || TREE_CODE (type
) == ENUMERAL_TYPE
)
13429 if (operator_code
== CALL_EXPR
)
13430 /* There are no further restrictions on the arguments to an overloaded
13434 if (operator_code
== COND_EXPR
)
13437 error_at (loc
, "ISO C++ prohibits overloading operator ?:");
13441 /* Count the number of arguments and check for ellipsis. */
13443 for (tree arg
= argtypes
; arg
!= void_list_node
; arg
= TREE_CHAIN (arg
))
13448 error_at (loc
, "%qD must not have variable number of arguments",
13455 /* Verify correct number of arguments. */
13458 case OVL_OP_FLAG_AMBIARY
:
13461 /* We have a unary instance of an ambi-ary op. Remap to the
13463 unsigned alt
= ovl_op_alternate
[ovl_op_mapping
[operator_code
]];
13464 const ovl_op_info_t
*ovl_op
= &ovl_op_info
[false][alt
];
13465 gcc_checking_assert (ovl_op
->flags
== OVL_OP_FLAG_UNARY
);
13466 operator_code
= ovl_op
->tree_code
;
13467 DECL_OVERLOADED_OPERATOR_CODE_RAW (decl
) = ovl_op
->ovl_op_code
;
13469 else if (arity
!= 2)
13471 /* This was an ambiguous operator but is invalid. */
13474 ? G_("%qD must have either zero or one argument")
13475 : G_("%qD must have either one or two arguments"), decl
);
13478 else if ((operator_code
== POSTINCREMENT_EXPR
13479 || operator_code
== POSTDECREMENT_EXPR
)
13480 && ! processing_template_decl
13481 /* x++ and x--'s second argument must be an int. */
13482 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes
)),
13483 integer_type_node
))
13487 ? G_("postfix %qD must have %<int%> as its argument")
13488 : G_("postfix %qD must have %<int%> as its second argument"),
13494 case OVL_OP_FLAG_UNARY
:
13499 ? G_("%qD must have no arguments")
13500 : G_("%qD must have exactly one argument"), decl
);
13505 case OVL_OP_FLAG_BINARY
:
13510 ? G_("%qD must have exactly one argument")
13511 : G_("%qD must have exactly two arguments"), decl
);
13517 gcc_unreachable ();
13520 /* There can be no default arguments. */
13521 for (tree arg
= argtypes
; arg
!= void_list_node
; arg
= TREE_CHAIN (arg
))
13522 if (TREE_PURPOSE (arg
))
13524 TREE_PURPOSE (arg
) = NULL_TREE
;
13525 error_at (loc
, "%qD cannot have default arguments", decl
);
13529 /* At this point the declaration is well-formed. It may not be
13530 sensible though. */
13532 /* Check member function warnings only on the in-class declaration.
13533 There's no point warning on an out-of-class definition. */
13534 if (class_type
&& class_type
!= current_class_type
)
13537 /* Warn about conversion operators that will never be used. */
13538 if (IDENTIFIER_CONV_OP_P (name
)
13539 && ! DECL_TEMPLATE_INFO (decl
)
13540 && warn_conversion
)
13542 tree t
= TREE_TYPE (name
);
13543 int ref
= TYPE_REF_P (t
);
13546 t
= TYPE_MAIN_VARIANT (TREE_TYPE (t
));
13548 if (VOID_TYPE_P (t
))
13549 warning_at (loc
, OPT_Wconversion
,
13551 ? G_("conversion to a reference to void "
13552 "will never use a type conversion operator")
13553 : G_("conversion to void "
13554 "will never use a type conversion operator"));
13555 else if (class_type
)
13557 if (t
== class_type
)
13558 warning_at (loc
, OPT_Wconversion
,
13560 ? G_("conversion to a reference to the same type "
13561 "will never use a type conversion operator")
13562 : G_("conversion to the same type "
13563 "will never use a type conversion operator"));
13564 /* Don't force t to be complete here. */
13565 else if (MAYBE_CLASS_TYPE_P (t
)
13566 && COMPLETE_TYPE_P (t
)
13567 && DERIVED_FROM_P (t
, class_type
))
13568 warning_at (loc
, OPT_Wconversion
,
13570 ? G_("conversion to a reference to a base class "
13571 "will never use a type conversion operator")
13572 : G_("conversion to a base class "
13573 "will never use a type conversion operator"));
13580 /* Effective C++ rules below. */
13582 /* More Effective C++ rule 7. */
13583 if (operator_code
== TRUTH_ANDIF_EXPR
13584 || operator_code
== TRUTH_ORIF_EXPR
13585 || operator_code
== COMPOUND_EXPR
)
13586 warning_at (loc
, OPT_Weffc__
,
13587 "user-defined %qD always evaluates both arguments", decl
);
13589 /* More Effective C++ rule 6. */
13590 if (operator_code
== POSTINCREMENT_EXPR
13591 || operator_code
== POSTDECREMENT_EXPR
13592 || operator_code
== PREINCREMENT_EXPR
13593 || operator_code
== PREDECREMENT_EXPR
)
13595 tree arg
= TREE_VALUE (argtypes
);
13596 tree ret
= TREE_TYPE (TREE_TYPE (decl
));
13597 if (methodp
|| TYPE_REF_P (arg
))
13598 arg
= TREE_TYPE (arg
);
13599 arg
= TYPE_MAIN_VARIANT (arg
);
13601 if (operator_code
== PREINCREMENT_EXPR
13602 || operator_code
== PREDECREMENT_EXPR
)
13604 if (!TYPE_REF_P (ret
)
13605 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret
)), arg
))
13606 warning_at (loc
, OPT_Weffc__
, "prefix %qD should return %qT", decl
,
13607 build_reference_type (arg
));
13611 if (!same_type_p (TYPE_MAIN_VARIANT (ret
), arg
))
13612 warning_at (loc
, OPT_Weffc__
,
13613 "postfix %qD should return %qT", decl
, arg
);
13617 /* Effective C++ rule 23. */
13618 if (!DECL_ASSIGNMENT_OPERATOR_P (decl
)
13619 && (operator_code
== PLUS_EXPR
13620 || operator_code
== MINUS_EXPR
13621 || operator_code
== TRUNC_DIV_EXPR
13622 || operator_code
== MULT_EXPR
13623 || operator_code
== TRUNC_MOD_EXPR
)
13624 && TYPE_REF_P (TREE_TYPE (TREE_TYPE (decl
))))
13625 warning_at (loc
, OPT_Weffc__
, "%qD should return by value", decl
);
13630 /* Return a string giving the keyword associate with CODE. */
13632 static const char *
13633 tag_name (enum tag_types code
)
13645 case typename_type
:
13648 gcc_unreachable ();
13652 /* Name lookup in an elaborated-type-specifier (after the keyword
13653 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
13654 elaborated-type-specifier is invalid, issue a diagnostic and return
13655 error_mark_node; otherwise, return the *_TYPE to which it referred.
13656 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
13659 check_elaborated_type_specifier (enum tag_types tag_code
,
13661 bool allow_template_p
)
13667 struct S { struct S *p; };
13669 name lookup will find the TYPE_DECL for the implicit "S::S"
13670 typedef. Adjust for that here. */
13671 if (DECL_SELF_REFERENCE_P (decl
))
13672 decl
= TYPE_NAME (TREE_TYPE (decl
));
13674 type
= TREE_TYPE (decl
);
13676 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
13677 is false for this case as well. */
13678 if (TREE_CODE (type
) == TEMPLATE_TYPE_PARM
)
13680 error ("using template type parameter %qT after %qs",
13681 type
, tag_name (tag_code
));
13682 return error_mark_node
;
13684 /* Accept template template parameters. */
13685 else if (allow_template_p
13686 && (TREE_CODE (type
) == BOUND_TEMPLATE_TEMPLATE_PARM
13687 || TREE_CODE (type
) == TEMPLATE_TEMPLATE_PARM
))
13691 If the identifier resolves to a typedef-name or the
13692 simple-template-id resolves to an alias template
13693 specialization, the elaborated-type-specifier is ill-formed.
13695 In other words, the only legitimate declaration to use in the
13696 elaborated type specifier is the implicit typedef created when
13697 the type is declared. */
13698 else if (!DECL_IMPLICIT_TYPEDEF_P (decl
)
13699 && !DECL_SELF_REFERENCE_P (decl
)
13700 && tag_code
!= typename_type
)
13702 if (alias_template_specialization_p (type
))
13703 error ("using alias template specialization %qT after %qs",
13704 type
, tag_name (tag_code
));
13706 error ("using typedef-name %qD after %qs", decl
, tag_name (tag_code
));
13707 inform (DECL_SOURCE_LOCATION (decl
),
13708 "%qD has a previous declaration here", decl
);
13709 return error_mark_node
;
13711 else if (TREE_CODE (type
) != RECORD_TYPE
13712 && TREE_CODE (type
) != UNION_TYPE
13713 && tag_code
!= enum_type
13714 && tag_code
!= typename_type
)
13716 error ("%qT referred to as %qs", type
, tag_name (tag_code
));
13717 inform (location_of (type
), "%qT has a previous declaration here", type
);
13718 return error_mark_node
;
13720 else if (TREE_CODE (type
) != ENUMERAL_TYPE
13721 && tag_code
== enum_type
)
13723 error ("%qT referred to as enum", type
);
13724 inform (location_of (type
), "%qT has a previous declaration here", type
);
13725 return error_mark_node
;
13727 else if (!allow_template_p
13728 && TREE_CODE (type
) == RECORD_TYPE
13729 && CLASSTYPE_IS_TEMPLATE (type
))
13731 /* If a class template appears as elaborated type specifier
13732 without a template header such as:
13734 template <class T> class C {};
13735 void f(class C); // No template header here
13737 then the required template argument is missing. */
13738 error ("template argument required for %<%s %T%>",
13739 tag_name (tag_code
),
13740 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type
)));
13741 return error_mark_node
;
13747 /* Lookup NAME in elaborate type specifier in scope according to
13748 SCOPE and issue diagnostics if necessary.
13749 Return *_TYPE node upon success, NULL_TREE when the NAME is not
13750 found, and ERROR_MARK_NODE for type error. */
13753 lookup_and_check_tag (enum tag_types tag_code
, tree name
,
13754 tag_scope scope
, bool template_header_p
)
13758 if (scope
== ts_global
)
13760 /* First try ordinary name lookup, ignoring hidden class name
13761 injected via friend declaration. */
13762 decl
= lookup_name_prefer_type (name
, 2);
13763 decl
= strip_using_decl (decl
);
13764 /* If that fails, the name will be placed in the smallest
13765 non-class, non-function-prototype scope according to 3.3.1/5.
13766 We may already have a hidden name declared as friend in this
13767 scope. So lookup again but not ignoring hidden names.
13768 If we find one, that name will be made visible rather than
13769 creating a new tag. */
13771 decl
= lookup_type_scope (name
, ts_within_enclosing_non_class
);
13774 decl
= lookup_type_scope (name
, scope
);
13777 && (DECL_CLASS_TEMPLATE_P (decl
)
13778 /* If scope is ts_current we're defining a class, so ignore a
13779 template template parameter. */
13780 || (scope
!= ts_current
13781 && DECL_TEMPLATE_TEMPLATE_PARM_P (decl
))))
13782 decl
= DECL_TEMPLATE_RESULT (decl
);
13784 if (decl
&& TREE_CODE (decl
) == TYPE_DECL
)
13786 /* Look for invalid nested type:
13790 if (scope
== ts_current
&& DECL_SELF_REFERENCE_P (decl
))
13792 error ("%qD has the same name as the class in which it is "
13795 return error_mark_node
;
13798 /* Two cases we need to consider when deciding if a class
13799 template is allowed as an elaborated type specifier:
13800 1. It is a self reference to its own class.
13801 2. It comes with a template header.
13805 template <class T> class C {
13806 class C *c1; // DECL_SELF_REFERENCE_P is true
13809 template <class U> class C; // template_header_p is true
13810 template <class T> class C<T>::D {
13811 class C *c2; // DECL_SELF_REFERENCE_P is true
13814 t
= check_elaborated_type_specifier (tag_code
,
13817 | DECL_SELF_REFERENCE_P (decl
));
13818 if (template_header_p
&& t
&& CLASS_TYPE_P (t
)
13819 && (!CLASSTYPE_TEMPLATE_INFO (t
)
13820 || (!PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t
)))))
13822 error ("%qT is not a template", t
);
13823 inform (location_of (t
), "previous declaration here");
13824 if (TYPE_CLASS_SCOPE_P (t
)
13825 && CLASSTYPE_TEMPLATE_INFO (TYPE_CONTEXT (t
)))
13826 inform (input_location
,
13827 "perhaps you want to explicitly add %<%T::%>",
13829 t
= error_mark_node
;
13834 else if (decl
&& TREE_CODE (decl
) == TREE_LIST
)
13836 error ("reference to %qD is ambiguous", name
);
13837 print_candidates (decl
);
13838 return error_mark_node
;
13844 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
13845 Define the tag as a forward-reference if it is not defined.
13847 If a declaration is given, process it here, and report an error if
13848 multiple declarations are not identical.
13850 SCOPE is TS_CURRENT when this is also a definition. Only look in
13851 the current frame for the name (since C++ allows new names in any
13852 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
13853 declaration. Only look beginning from the current scope outward up
13854 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
13856 TEMPLATE_HEADER_P is true when this declaration is preceded by
13857 a set of template parameters. */
13860 xref_tag_1 (enum tag_types tag_code
, tree name
,
13861 tag_scope scope
, bool template_header_p
)
13863 enum tree_code code
;
13864 tree context
= NULL_TREE
;
13866 gcc_assert (identifier_p (name
));
13872 code
= RECORD_TYPE
;
13878 code
= ENUMERAL_TYPE
;
13881 gcc_unreachable ();
13884 /* In case of anonymous name, xref_tag is only called to
13885 make type node and push name. Name lookup is not required. */
13886 tree t
= NULL_TREE
;
13887 if (scope
!= ts_lambda
&& !anon_aggrname_p (name
))
13888 t
= lookup_and_check_tag (tag_code
, name
, scope
, template_header_p
);
13890 if (t
== error_mark_node
)
13891 return error_mark_node
;
13893 if (scope
!= ts_current
&& t
&& current_class_type
13894 && template_class_depth (current_class_type
)
13895 && template_header_p
)
13897 if (TREE_CODE (t
) == TEMPLATE_TEMPLATE_PARM
)
13900 /* Since SCOPE is not TS_CURRENT, we are not looking at a
13901 definition of this tag. Since, in addition, we are currently
13902 processing a (member) template declaration of a template
13903 class, we must be very careful; consider:
13905 template <class X> struct S1
13907 template <class U> struct S2
13909 template <class V> friend struct S1;
13912 Here, the S2::S1 declaration should not be confused with the
13913 outer declaration. In particular, the inner version should
13914 have a template parameter of level 2, not level 1.
13916 On the other hand, when presented with:
13918 template <class T> struct S1
13920 template <class U> struct S2 {};
13921 template <class U> friend struct S2;
13924 the friend must find S1::S2 eventually. We accomplish this
13925 by making sure that the new type we create to represent this
13926 declaration has the right TYPE_CONTEXT. */
13927 context
= TYPE_CONTEXT (t
);
13933 /* If no such tag is yet defined, create a forward-reference node
13934 and record it as the "definition".
13935 When a real declaration of this type is found,
13936 the forward-reference will be altered into a real type. */
13937 if (code
== ENUMERAL_TYPE
)
13939 error ("use of enum %q#D without previous declaration", name
);
13940 return error_mark_node
;
13944 t
= make_class_type (code
);
13945 TYPE_CONTEXT (t
) = context
;
13946 if (scope
== ts_lambda
)
13948 /* Mark it as a lambda type. */
13949 CLASSTYPE_LAMBDA_EXPR (t
) = error_mark_node
;
13950 /* And push it into current scope. */
13951 scope
= ts_current
;
13953 t
= pushtag (name
, t
, scope
);
13958 if (template_header_p
&& MAYBE_CLASS_TYPE_P (t
))
13960 /* Check that we aren't trying to overload a class with different
13962 tree constr
= NULL_TREE
;
13963 if (current_template_parms
)
13965 tree reqs
= TEMPLATE_PARMS_CONSTRAINTS (current_template_parms
);
13966 constr
= build_constraints (reqs
, NULL_TREE
);
13968 if (!redeclare_class_template (t
, current_template_parms
, constr
))
13969 return error_mark_node
;
13971 else if (!processing_template_decl
13972 && CLASS_TYPE_P (t
)
13973 && CLASSTYPE_IS_TEMPLATE (t
))
13975 error ("redeclaration of %qT as a non-template", t
);
13976 inform (location_of (t
), "previous declaration %qD", t
);
13977 return error_mark_node
;
13980 if (scope
!= ts_within_enclosing_non_class
&& TYPE_HIDDEN_P (t
))
13982 /* This is no longer an invisible friend. Make it
13984 tree decl
= TYPE_NAME (t
);
13986 DECL_ANTICIPATED (decl
) = false;
13987 DECL_FRIEND_P (decl
) = false;
13989 if (TYPE_TEMPLATE_INFO (t
))
13991 tree tmpl
= TYPE_TI_TEMPLATE (t
);
13992 DECL_ANTICIPATED (tmpl
) = false;
13993 DECL_FRIEND_P (tmpl
) = false;
14001 /* Wrapper for xref_tag_1. */
14004 xref_tag (enum tag_types tag_code
, tree name
,
14005 tag_scope scope
, bool template_header_p
)
14009 subtime
= timevar_cond_start (TV_NAME_LOOKUP
);
14010 ret
= xref_tag_1 (tag_code
, name
, scope
, template_header_p
);
14011 timevar_cond_stop (TV_NAME_LOOKUP
, subtime
);
14017 xref_tag_from_type (tree old
, tree id
, tag_scope scope
)
14019 enum tag_types tag_kind
;
14021 if (TREE_CODE (old
) == RECORD_TYPE
)
14022 tag_kind
= (CLASSTYPE_DECLARED_CLASS (old
) ? class_type
: record_type
);
14024 tag_kind
= union_type
;
14026 if (id
== NULL_TREE
)
14027 id
= TYPE_IDENTIFIER (old
);
14029 return xref_tag (tag_kind
, id
, scope
, false);
14032 /* Create the binfo hierarchy for REF with (possibly NULL) base list
14033 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
14034 access_* node, and the TREE_VALUE is the type of the base-class.
14035 Non-NULL TREE_TYPE indicates virtual inheritance. */
14038 xref_basetypes (tree ref
, tree base_list
)
14041 tree binfo
, base_binfo
;
14042 unsigned max_vbases
= 0; /* Maximum direct & indirect virtual bases. */
14043 unsigned max_bases
= 0; /* Maximum direct bases. */
14044 unsigned max_dvbases
= 0; /* Maximum direct virtual bases. */
14046 tree default_access
;
14047 tree igo_prev
; /* Track Inheritance Graph Order. */
14049 if (ref
== error_mark_node
)
14052 /* The base of a derived class is private by default, all others are
14054 default_access
= (TREE_CODE (ref
) == RECORD_TYPE
14055 && CLASSTYPE_DECLARED_CLASS (ref
)
14056 ? access_private_node
: access_public_node
);
14058 /* First, make sure that any templates in base-classes are
14059 instantiated. This ensures that if we call ourselves recursively
14060 we do not get confused about which classes are marked and which
14062 basep
= &base_list
;
14065 tree basetype
= TREE_VALUE (*basep
);
14067 /* The dependent_type_p call below should really be dependent_scope_p
14068 so that we give a hard error about using an incomplete type as a
14069 base, but we allow it with a pedwarn for backward
14071 if (processing_template_decl
14072 && CLASS_TYPE_P (basetype
) && TYPE_BEING_DEFINED (basetype
))
14073 cxx_incomplete_type_diagnostic (NULL_TREE
, basetype
, DK_PEDWARN
);
14074 if (!dependent_type_p (basetype
)
14075 && !complete_type_or_else (basetype
, NULL
))
14076 /* An incomplete type. Remove it from the list. */
14077 *basep
= TREE_CHAIN (*basep
);
14081 if (TREE_TYPE (*basep
))
14083 if (CLASS_TYPE_P (basetype
))
14084 max_vbases
+= vec_safe_length (CLASSTYPE_VBASECLASSES (basetype
));
14085 basep
= &TREE_CHAIN (*basep
);
14088 max_vbases
+= max_dvbases
;
14090 TYPE_MARKED_P (ref
) = 1;
14092 /* The binfo slot should be empty, unless this is an (ill-formed)
14094 gcc_assert (!TYPE_BINFO (ref
) || TYPE_SIZE (ref
));
14096 gcc_assert (TYPE_MAIN_VARIANT (ref
) == ref
);
14098 binfo
= make_tree_binfo (max_bases
);
14100 TYPE_BINFO (ref
) = binfo
;
14101 BINFO_OFFSET (binfo
) = size_zero_node
;
14102 BINFO_TYPE (binfo
) = ref
;
14104 /* Apply base-class info set up to the variants of this type. */
14105 fixup_type_variants (ref
);
14109 vec_alloc (BINFO_BASE_ACCESSES (binfo
), max_bases
);
14110 /* A C++98 POD cannot have base classes. */
14111 CLASSTYPE_NON_LAYOUT_POD_P (ref
) = true;
14113 if (TREE_CODE (ref
) == UNION_TYPE
)
14115 error ("derived union %qT invalid", ref
);
14121 warning (OPT_Wmultiple_inheritance
,
14122 "%qT defined with multiple direct bases", ref
);
14126 /* An aggregate can't have virtual base classes. */
14127 CLASSTYPE_NON_AGGREGATE (ref
) = true;
14129 vec_alloc (CLASSTYPE_VBASECLASSES (ref
), max_vbases
);
14132 warning (OPT_Wvirtual_inheritance
,
14133 "%qT defined with direct virtual base", ref
);
14136 for (igo_prev
= binfo
; base_list
; base_list
= TREE_CHAIN (base_list
))
14138 tree access
= TREE_PURPOSE (base_list
);
14139 int via_virtual
= TREE_TYPE (base_list
) != NULL_TREE
;
14140 tree basetype
= TREE_VALUE (base_list
);
14142 if (access
== access_default_node
)
14143 access
= default_access
;
14145 /* Before C++17, an aggregate cannot have base classes. In C++17, an
14146 aggregate can't have virtual, private, or protected base classes. */
14147 if (cxx_dialect
< cxx17
14148 || access
!= access_public_node
14150 CLASSTYPE_NON_AGGREGATE (ref
) = true;
14152 if (PACK_EXPANSION_P (basetype
))
14153 basetype
= PACK_EXPANSION_PATTERN (basetype
);
14154 if (TREE_CODE (basetype
) == TYPE_DECL
)
14155 basetype
= TREE_TYPE (basetype
);
14156 if (!MAYBE_CLASS_TYPE_P (basetype
) || TREE_CODE (basetype
) == UNION_TYPE
)
14158 error ("base type %qT fails to be a struct or class type",
14163 base_binfo
= NULL_TREE
;
14164 if (CLASS_TYPE_P (basetype
) && !dependent_scope_p (basetype
))
14166 base_binfo
= TYPE_BINFO (basetype
);
14167 /* The original basetype could have been a typedef'd type. */
14168 basetype
= BINFO_TYPE (base_binfo
);
14170 /* Inherit flags from the base. */
14171 TYPE_HAS_NEW_OPERATOR (ref
)
14172 |= TYPE_HAS_NEW_OPERATOR (basetype
);
14173 TYPE_HAS_ARRAY_NEW_OPERATOR (ref
)
14174 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype
);
14175 TYPE_GETS_DELETE (ref
) |= TYPE_GETS_DELETE (basetype
);
14176 TYPE_HAS_CONVERSION (ref
) |= TYPE_HAS_CONVERSION (basetype
);
14177 CLASSTYPE_DIAMOND_SHAPED_P (ref
)
14178 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype
);
14179 CLASSTYPE_REPEATED_BASE_P (ref
)
14180 |= CLASSTYPE_REPEATED_BASE_P (basetype
);
14183 /* We must do this test after we've seen through a typedef
14185 if (TYPE_MARKED_P (basetype
))
14187 if (basetype
== ref
)
14188 error ("recursive type %qT undefined", basetype
);
14190 error ("duplicate base type %qT invalid", basetype
);
14194 if (PACK_EXPANSION_P (TREE_VALUE (base_list
)))
14195 /* Regenerate the pack expansion for the bases. */
14196 basetype
= make_pack_expansion (basetype
);
14198 TYPE_MARKED_P (basetype
) = 1;
14200 base_binfo
= copy_binfo (base_binfo
, basetype
, ref
,
14201 &igo_prev
, via_virtual
);
14202 if (!BINFO_INHERITANCE_CHAIN (base_binfo
))
14203 BINFO_INHERITANCE_CHAIN (base_binfo
) = binfo
;
14205 BINFO_BASE_APPEND (binfo
, base_binfo
);
14206 BINFO_BASE_ACCESS_APPEND (binfo
, access
);
14210 /* Update max_vbases to reflect the reality that we are dropping
14211 this base: if it reaches zero we want to undo the vec_alloc
14212 above to avoid inconsistencies during error-recovery: eg, in
14213 build_special_member_call, CLASSTYPE_VBASECLASSES non null
14214 and vtt null (c++/27952). */
14217 if (CLASS_TYPE_P (basetype
))
14219 -= vec_safe_length (CLASSTYPE_VBASECLASSES (basetype
));
14222 if (CLASSTYPE_VBASECLASSES (ref
)
14223 && max_vbases
== 0)
14224 vec_free (CLASSTYPE_VBASECLASSES (ref
));
14226 if (vec_safe_length (CLASSTYPE_VBASECLASSES (ref
)) < max_vbases
)
14227 /* If we didn't get max_vbases vbases, we must have shared at
14228 least one of them, and are therefore diamond shaped. */
14229 CLASSTYPE_DIAMOND_SHAPED_P (ref
) = 1;
14231 /* Unmark all the types. */
14232 for (i
= 0; BINFO_BASE_ITERATE (binfo
, i
, base_binfo
); i
++)
14233 TYPE_MARKED_P (BINFO_TYPE (base_binfo
)) = 0;
14234 TYPE_MARKED_P (ref
) = 0;
14236 /* Now see if we have a repeated base type. */
14237 if (!CLASSTYPE_REPEATED_BASE_P (ref
))
14239 for (base_binfo
= binfo
; base_binfo
;
14240 base_binfo
= TREE_CHAIN (base_binfo
))
14242 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo
)))
14244 CLASSTYPE_REPEATED_BASE_P (ref
) = 1;
14247 TYPE_MARKED_P (BINFO_TYPE (base_binfo
)) = 1;
14249 for (base_binfo
= binfo
; base_binfo
;
14250 base_binfo
= TREE_CHAIN (base_binfo
))
14251 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo
)))
14252 TYPE_MARKED_P (BINFO_TYPE (base_binfo
)) = 0;
14259 /* Copies the enum-related properties from type SRC to type DST.
14260 Used with the underlying type of an enum and the enum itself. */
14262 copy_type_enum (tree dst
, tree src
)
14265 for (t
= dst
; t
; t
= TYPE_NEXT_VARIANT (t
))
14267 TYPE_MIN_VALUE (t
) = TYPE_MIN_VALUE (src
);
14268 TYPE_MAX_VALUE (t
) = TYPE_MAX_VALUE (src
);
14269 TYPE_SIZE (t
) = TYPE_SIZE (src
);
14270 TYPE_SIZE_UNIT (t
) = TYPE_SIZE_UNIT (src
);
14271 SET_TYPE_MODE (dst
, TYPE_MODE (src
));
14272 TYPE_PRECISION (t
) = TYPE_PRECISION (src
);
14273 unsigned valign
= TYPE_ALIGN (src
);
14274 if (TYPE_USER_ALIGN (t
))
14275 valign
= MAX (valign
, TYPE_ALIGN (t
));
14277 TYPE_USER_ALIGN (t
) = TYPE_USER_ALIGN (src
);
14278 SET_TYPE_ALIGN (t
, valign
);
14279 TYPE_UNSIGNED (t
) = TYPE_UNSIGNED (src
);
14283 /* Begin compiling the definition of an enumeration type.
14286 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
14288 UNDERLYING_TYPE is the type that will be used as the storage for
14289 the enumeration type. This should be NULL_TREE if no storage type
14292 ATTRIBUTES are any attributes specified after the enum-key.
14294 SCOPED_ENUM_P is true if this is a scoped enumeration type.
14296 if IS_NEW is not NULL, gets TRUE iff a new type is created.
14298 Returns the type object, as yet incomplete.
14299 Also records info about it so that build_enumerator
14300 may be used to declare the individual values as they are read. */
14303 start_enum (tree name
, tree enumtype
, tree underlying_type
,
14304 tree attributes
, bool scoped_enum_p
, bool *is_new
)
14306 tree prevtype
= NULL_TREE
;
14307 gcc_assert (identifier_p (name
));
14311 /* [C++0x dcl.enum]p5:
14313 If not explicitly specified, the underlying type of a scoped
14314 enumeration type is int. */
14315 if (!underlying_type
&& scoped_enum_p
)
14316 underlying_type
= integer_type_node
;
14318 if (underlying_type
)
14319 underlying_type
= cv_unqualified (underlying_type
);
14321 /* If this is the real definition for a previous forward reference,
14322 fill in the contents in the same object that used to be the
14323 forward reference. */
14325 enumtype
= lookup_and_check_tag (enum_type
, name
,
14326 /*tag_scope=*/ts_current
,
14327 /*template_header_p=*/false);
14329 /* In case of a template_decl, the only check that should be deferred
14330 to instantiation time is the comparison of underlying types. */
14331 if (enumtype
&& TREE_CODE (enumtype
) == ENUMERAL_TYPE
)
14333 if (scoped_enum_p
!= SCOPED_ENUM_P (enumtype
))
14335 error_at (input_location
, "scoped/unscoped mismatch "
14336 "in enum %q#T", enumtype
);
14337 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype
)),
14338 "previous definition here");
14339 enumtype
= error_mark_node
;
14341 else if (ENUM_FIXED_UNDERLYING_TYPE_P (enumtype
) != !! underlying_type
)
14343 error_at (input_location
, "underlying type mismatch "
14344 "in enum %q#T", enumtype
);
14345 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype
)),
14346 "previous definition here");
14347 enumtype
= error_mark_node
;
14349 else if (underlying_type
&& ENUM_UNDERLYING_TYPE (enumtype
)
14350 && !same_type_p (underlying_type
,
14351 ENUM_UNDERLYING_TYPE (enumtype
)))
14353 error_at (input_location
, "different underlying type "
14354 "in enum %q#T", enumtype
);
14355 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype
)),
14356 "previous definition here");
14357 underlying_type
= NULL_TREE
;
14361 if (!enumtype
|| TREE_CODE (enumtype
) != ENUMERAL_TYPE
14362 || processing_template_decl
)
14364 /* In case of error, make a dummy enum to allow parsing to
14366 if (enumtype
== error_mark_node
)
14368 name
= make_anon_name ();
14369 enumtype
= NULL_TREE
;
14372 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
14373 of an opaque enum, or an opaque enum of an already defined
14374 enumeration (C++11).
14375 In any other case, it'll be NULL_TREE. */
14381 prevtype
= enumtype
;
14383 /* Do not push the decl more than once. */
14385 || TREE_CODE (enumtype
) != ENUMERAL_TYPE
)
14387 enumtype
= cxx_make_type (ENUMERAL_TYPE
);
14388 enumtype
= pushtag (name
, enumtype
, /*tag_scope=*/ts_current
);
14390 /* std::byte aliases anything. */
14391 if (enumtype
!= error_mark_node
14392 && TYPE_CONTEXT (enumtype
) == std_node
14393 && !strcmp ("byte", TYPE_NAME_STRING (enumtype
)))
14394 TYPE_ALIAS_SET (enumtype
) = 0;
14397 enumtype
= xref_tag (enum_type
, name
, /*tag_scope=*/ts_current
,
14400 if (enumtype
== error_mark_node
)
14401 return error_mark_node
;
14403 /* The enum is considered opaque until the opening '{' of the
14404 enumerator list. */
14405 SET_OPAQUE_ENUM_P (enumtype
, true);
14406 ENUM_FIXED_UNDERLYING_TYPE_P (enumtype
) = !! underlying_type
;
14409 SET_SCOPED_ENUM_P (enumtype
, scoped_enum_p
);
14411 cplus_decl_attributes (&enumtype
, attributes
, (int)ATTR_FLAG_TYPE_IN_PLACE
);
14413 if (underlying_type
)
14415 if (ENUM_UNDERLYING_TYPE (enumtype
))
14416 /* We already checked that it matches, don't change it to a different
14417 typedef variant. */;
14418 else if (CP_INTEGRAL_TYPE_P (underlying_type
))
14420 copy_type_enum (enumtype
, underlying_type
);
14421 ENUM_UNDERLYING_TYPE (enumtype
) = underlying_type
;
14423 else if (dependent_type_p (underlying_type
))
14424 ENUM_UNDERLYING_TYPE (enumtype
) = underlying_type
;
14426 error ("underlying type %qT of %qT must be an integral type",
14427 underlying_type
, enumtype
);
14430 /* If into a template class, the returned enum is always the first
14431 declaration (opaque or not) seen. This way all the references to
14432 this type will be to the same declaration. The following ones are used
14433 only to check for definition errors. */
14434 if (prevtype
&& processing_template_decl
)
14440 /* After processing and defining all the values of an enumeration type,
14441 install their decls in the enumeration type.
14442 ENUMTYPE is the type object. */
14445 finish_enum_value_list (tree enumtype
)
14448 tree underlying_type
;
14451 tree minnode
, maxnode
;
14454 bool fixed_underlying_type_p
14455 = ENUM_UNDERLYING_TYPE (enumtype
) != NULL_TREE
;
14457 /* We built up the VALUES in reverse order. */
14458 TYPE_VALUES (enumtype
) = nreverse (TYPE_VALUES (enumtype
));
14460 /* For an enum defined in a template, just set the type of the values;
14461 all further processing is postponed until the template is
14462 instantiated. We need to set the type so that tsubst of a CONST_DECL
14464 if (processing_template_decl
)
14466 for (values
= TYPE_VALUES (enumtype
);
14468 values
= TREE_CHAIN (values
))
14469 TREE_TYPE (TREE_VALUE (values
)) = enumtype
;
14473 /* Determine the minimum and maximum values of the enumerators. */
14474 if (TYPE_VALUES (enumtype
))
14476 minnode
= maxnode
= NULL_TREE
;
14478 for (values
= TYPE_VALUES (enumtype
);
14480 values
= TREE_CHAIN (values
))
14482 decl
= TREE_VALUE (values
);
14484 /* [dcl.enum]: Following the closing brace of an enum-specifier,
14485 each enumerator has the type of its enumeration. Prior to the
14486 closing brace, the type of each enumerator is the type of its
14487 initializing value. */
14488 TREE_TYPE (decl
) = enumtype
;
14490 /* Update the minimum and maximum values, if appropriate. */
14491 value
= DECL_INITIAL (decl
);
14492 if (value
== error_mark_node
)
14493 value
= integer_zero_node
;
14494 /* Figure out what the minimum and maximum values of the
14495 enumerators are. */
14497 minnode
= maxnode
= value
;
14498 else if (tree_int_cst_lt (maxnode
, value
))
14500 else if (tree_int_cst_lt (value
, minnode
))
14507 If the enumerator-list is empty, the underlying type is as if
14508 the enumeration had a single enumerator with value 0. */
14509 minnode
= maxnode
= integer_zero_node
;
14511 if (!fixed_underlying_type_p
)
14513 /* Compute the number of bits require to represent all values of the
14514 enumeration. We must do this before the type of MINNODE and
14515 MAXNODE are transformed, since tree_int_cst_min_precision relies
14516 on the TREE_TYPE of the value it is passed. */
14517 signop sgn
= tree_int_cst_sgn (minnode
) >= 0 ? UNSIGNED
: SIGNED
;
14518 int lowprec
= tree_int_cst_min_precision (minnode
, sgn
);
14519 int highprec
= tree_int_cst_min_precision (maxnode
, sgn
);
14520 int precision
= MAX (lowprec
, highprec
);
14522 bool use_short_enum
;
14524 /* Determine the underlying type of the enumeration.
14528 The underlying type of an enumeration is an integral type that
14529 can represent all the enumerator values defined in the
14530 enumeration. It is implementation-defined which integral type is
14531 used as the underlying type for an enumeration except that the
14532 underlying type shall not be larger than int unless the value of
14533 an enumerator cannot fit in an int or unsigned int.
14535 We use "int" or an "unsigned int" as the underlying type, even if
14536 a smaller integral type would work, unless the user has
14537 explicitly requested that we use the smallest possible type. The
14538 user can request that for all enumerations with a command line
14539 flag, or for just one enumeration with an attribute. */
14541 use_short_enum
= flag_short_enums
14542 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype
));
14544 /* If the precision of the type was specified with an attribute and it
14545 was too small, give an error. Otherwise, use it. */
14546 if (TYPE_PRECISION (enumtype
))
14548 if (precision
> TYPE_PRECISION (enumtype
))
14549 error ("specified mode too small for enumeral values");
14552 use_short_enum
= true;
14553 precision
= TYPE_PRECISION (enumtype
);
14557 for (itk
= (use_short_enum
? itk_char
: itk_int
);
14561 underlying_type
= integer_types
[itk
];
14562 if (underlying_type
!= NULL_TREE
14563 && TYPE_PRECISION (underlying_type
) >= precision
14564 && TYPE_SIGN (underlying_type
) == sgn
)
14567 if (itk
== itk_none
)
14571 IF no integral type can represent all the enumerator values, the
14572 enumeration is ill-formed. */
14573 error ("no integral type can represent all of the enumerator values "
14574 "for %qT", enumtype
);
14575 precision
= TYPE_PRECISION (long_long_integer_type_node
);
14576 underlying_type
= integer_types
[itk_unsigned_long_long
];
14581 The value of sizeof() applied to an enumeration type, an object
14582 of an enumeration type, or an enumerator, is the value of sizeof()
14583 applied to the underlying type. */
14584 copy_type_enum (enumtype
, underlying_type
);
14586 /* Compute the minimum and maximum values for the type.
14590 For an enumeration where emin is the smallest enumerator and emax
14591 is the largest, the values of the enumeration are the values of the
14592 underlying type in the range bmin to bmax, where bmin and bmax are,
14593 respectively, the smallest and largest values of the smallest bit-
14594 field that can store emin and emax. */
14596 /* The middle-end currently assumes that types with TYPE_PRECISION
14597 narrower than their underlying type are suitably zero or sign
14598 extended to fill their mode. Similarly, it assumes that the front
14599 end assures that a value of a particular type must be within
14600 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
14602 We used to set these fields based on bmin and bmax, but that led
14603 to invalid assumptions like optimizing away bounds checking. So
14604 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
14605 TYPE_MAX_VALUE to the values for the mode above and only restrict
14606 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
14607 ENUM_UNDERLYING_TYPE (enumtype
)
14608 = build_distinct_type_copy (underlying_type
);
14609 TYPE_PRECISION (ENUM_UNDERLYING_TYPE (enumtype
)) = precision
;
14610 set_min_and_max_values_for_integral_type
14611 (ENUM_UNDERLYING_TYPE (enumtype
), precision
, sgn
);
14613 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
14614 if (flag_strict_enums
)
14615 set_min_and_max_values_for_integral_type (enumtype
, precision
, sgn
);
14618 underlying_type
= ENUM_UNDERLYING_TYPE (enumtype
);
14620 /* Convert each of the enumerators to the type of the underlying
14621 type of the enumeration. */
14622 for (values
= TYPE_VALUES (enumtype
); values
; values
= TREE_CHAIN (values
))
14624 location_t saved_location
;
14626 decl
= TREE_VALUE (values
);
14627 saved_location
= input_location
;
14628 input_location
= DECL_SOURCE_LOCATION (decl
);
14629 if (fixed_underlying_type_p
)
14630 /* If the enumeration type has a fixed underlying type, we
14631 already checked all of the enumerator values. */
14632 value
= DECL_INITIAL (decl
);
14634 value
= perform_implicit_conversion (underlying_type
,
14635 DECL_INITIAL (decl
),
14636 tf_warning_or_error
);
14637 input_location
= saved_location
;
14639 /* Do not clobber shared ints. */
14640 if (value
!= error_mark_node
)
14642 value
= copy_node (value
);
14644 TREE_TYPE (value
) = enumtype
;
14646 DECL_INITIAL (decl
) = value
;
14649 /* Fix up all variant types of this enum type. */
14650 for (t
= TYPE_MAIN_VARIANT (enumtype
); t
; t
= TYPE_NEXT_VARIANT (t
))
14651 TYPE_VALUES (t
) = TYPE_VALUES (enumtype
);
14653 if (at_class_scope_p ()
14654 && COMPLETE_TYPE_P (current_class_type
)
14655 && UNSCOPED_ENUM_P (enumtype
))
14657 insert_late_enum_def_bindings (current_class_type
, enumtype
);
14658 /* TYPE_FIELDS needs fixup. */
14659 fixup_type_variants (current_class_type
);
14662 /* Finish debugging output for this type. */
14663 rest_of_type_compilation (enumtype
, namespace_bindings_p ());
14665 /* Each enumerator now has the type of its enumeration. Clear the cache
14666 so that this change in types doesn't confuse us later on. */
14667 clear_cv_and_fold_caches ();
14670 /* Finishes the enum type. This is called only the first time an
14671 enumeration is seen, be it opaque or odinary.
14672 ENUMTYPE is the type object. */
14675 finish_enum (tree enumtype
)
14677 if (processing_template_decl
)
14679 if (at_function_scope_p ())
14680 add_stmt (build_min (TAG_DEFN
, enumtype
));
14684 /* If this is a forward declaration, there should not be any variants,
14685 though we can get a variant in the middle of an enum-specifier with
14686 wacky code like 'enum E { e = sizeof(const E*) };' */
14687 gcc_assert (enumtype
== TYPE_MAIN_VARIANT (enumtype
)
14688 && (TYPE_VALUES (enumtype
)
14689 || !TYPE_NEXT_VARIANT (enumtype
)));
14692 /* Build and install a CONST_DECL for an enumeration constant of the
14693 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
14694 Apply ATTRIBUTES if available. LOC is the location of NAME.
14695 Assignment of sequential values by default is handled here. */
14698 build_enumerator (tree name
, tree value
, tree enumtype
, tree attributes
,
14705 /* scalar_constant_value will pull out this expression, so make sure
14706 it's folded as appropriate. */
14707 if (processing_template_decl
)
14708 value
= fold_non_dependent_expr (value
);
14710 /* If the VALUE was erroneous, pretend it wasn't there; that will
14711 result in the enum being assigned the next value in sequence. */
14712 if (value
== error_mark_node
)
14715 /* Remove no-op casts from the value. */
14717 STRIP_TYPE_NOPS (value
);
14719 if (! processing_template_decl
)
14721 /* Validate and default VALUE. */
14722 if (value
!= NULL_TREE
)
14724 if (!ENUM_UNDERLYING_TYPE (enumtype
))
14726 tree tmp_value
= build_expr_type_conversion (WANT_INT
| WANT_ENUM
,
14731 else if (! INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P
14732 (TREE_TYPE (value
)))
14733 value
= perform_implicit_conversion_flags
14734 (ENUM_UNDERLYING_TYPE (enumtype
), value
, tf_warning_or_error
,
14735 LOOKUP_IMPLICIT
| LOOKUP_NO_NARROWING
);
14737 if (value
== error_mark_node
)
14740 if (value
!= NULL_TREE
)
14742 if (! INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P
14743 (TREE_TYPE (value
)))
14745 error ("enumerator value for %qD must have integral or "
14746 "unscoped enumeration type", name
);
14751 value
= cxx_constant_value (value
);
14753 if (TREE_CODE (value
) != INTEGER_CST
)
14755 error ("enumerator value for %qD is not an integer "
14763 /* Default based on previous value. */
14764 if (value
== NULL_TREE
)
14766 if (TYPE_VALUES (enumtype
))
14770 /* C++03 7.2/4: If no initializer is specified for the first
14771 enumerator, the type is an unspecified integral
14772 type. Otherwise the type is the same as the type of the
14773 initializing value of the preceding enumerator unless the
14774 incremented value is not representable in that type, in
14775 which case the type is an unspecified integral type
14776 sufficient to contain the incremented value. */
14777 prev_value
= DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype
)));
14778 if (error_operand_p (prev_value
))
14779 value
= error_mark_node
;
14782 wi::overflow_type overflowed
;
14783 tree type
= TREE_TYPE (prev_value
);
14784 signop sgn
= TYPE_SIGN (type
);
14785 widest_int wi
= wi::add (wi::to_widest (prev_value
), 1, sgn
,
14789 bool pos
= !wi::neg_p (wi
, sgn
);
14790 if (!wi::fits_to_tree_p (wi
, type
))
14793 for (itk
= itk_int
; itk
!= itk_none
; itk
++)
14795 type
= integer_types
[itk
];
14796 if (type
!= NULL_TREE
14797 && (pos
|| !TYPE_UNSIGNED (type
))
14798 && wi::fits_to_tree_p (wi
, type
))
14801 if (type
&& cxx_dialect
< cxx11
14802 && itk
> itk_unsigned_long
)
14803 pedwarn (input_location
, OPT_Wlong_long
,
14805 incremented enumerator value is too large for %<unsigned long%>") : G_("\
14806 incremented enumerator value is too large for %<long%>"));
14808 if (type
== NULL_TREE
)
14809 overflowed
= wi::OVF_UNKNOWN
;
14811 value
= wide_int_to_tree (type
, wi
);
14816 error ("overflow in enumeration values at %qD", name
);
14817 value
= error_mark_node
;
14822 value
= integer_zero_node
;
14825 /* Remove no-op casts from the value. */
14826 STRIP_TYPE_NOPS (value
);
14828 /* If the underlying type of the enum is fixed, check whether
14829 the enumerator values fits in the underlying type. If it
14830 does not fit, the program is ill-formed [C++0x dcl.enum]. */
14831 if (ENUM_UNDERLYING_TYPE (enumtype
)
14833 && TREE_CODE (value
) == INTEGER_CST
)
14835 if (!int_fits_type_p (value
, ENUM_UNDERLYING_TYPE (enumtype
)))
14836 error ("enumerator value %qE is outside the range of underlying "
14837 "type %qT", value
, ENUM_UNDERLYING_TYPE (enumtype
));
14839 /* Convert the value to the appropriate type. */
14840 value
= fold_convert (ENUM_UNDERLYING_TYPE (enumtype
), value
);
14844 /* C++ associates enums with global, function, or class declarations. */
14845 context
= current_scope ();
14847 /* Build the actual enumeration constant. Note that the enumeration
14848 constants have the underlying type of the enum (if it is fixed)
14849 or the type of their initializer (if the underlying type of the
14850 enum is not fixed):
14854 If the underlying type is fixed, the type of each enumerator
14855 prior to the closing brace is the underlying type; if the
14856 initializing value of an enumerator cannot be represented by
14857 the underlying type, the program is ill-formed. If the
14858 underlying type is not fixed, the type of each enumerator is
14859 the type of its initializing value.
14861 If the underlying type is not fixed, it will be computed by
14862 finish_enum and we will reset the type of this enumerator. Of
14863 course, if we're processing a template, there may be no value. */
14864 type
= value
? TREE_TYPE (value
) : NULL_TREE
;
14866 decl
= build_decl (loc
, CONST_DECL
, name
, type
);
14868 DECL_CONTEXT (decl
) = enumtype
;
14869 TREE_CONSTANT (decl
) = 1;
14870 TREE_READONLY (decl
) = 1;
14871 DECL_INITIAL (decl
) = value
;
14874 cplus_decl_attributes (&decl
, attributes
, 0);
14876 if (context
&& context
== current_class_type
&& !SCOPED_ENUM_P (enumtype
))
14878 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
14879 on the TYPE_FIELDS list for `S'. (That's so that you can say
14880 things like `S::i' later.) */
14882 /* The enumerator may be getting declared outside of its enclosing
14885 class S { public: enum E : int; }; enum S::E : int { i = 7; };
14887 For which case we need to make sure that the access of `S::i'
14888 matches the access of `S::E'. */
14889 tree saved_cas
= current_access_specifier
;
14890 if (TREE_PRIVATE (TYPE_NAME (enumtype
)))
14891 current_access_specifier
= access_private_node
;
14892 else if (TREE_PROTECTED (TYPE_NAME (enumtype
)))
14893 current_access_specifier
= access_protected_node
;
14895 current_access_specifier
= access_public_node
;
14897 finish_member_declaration (decl
);
14899 current_access_specifier
= saved_cas
;
14904 /* Add this enumeration constant to the list for this type. */
14905 TYPE_VALUES (enumtype
) = tree_cons (name
, decl
, TYPE_VALUES (enumtype
));
14908 /* Look for an enumerator with the given NAME within the enumeration
14909 type ENUMTYPE. This routine is used primarily for qualified name
14910 lookup into an enumerator in C++0x, e.g.,
14912 enum class Color { Red, Green, Blue };
14914 Color color = Color::Red;
14916 Returns the value corresponding to the enumerator, or
14917 NULL_TREE if no such enumerator was found. */
14919 lookup_enumerator (tree enumtype
, tree name
)
14922 gcc_assert (enumtype
&& TREE_CODE (enumtype
) == ENUMERAL_TYPE
);
14924 e
= purpose_member (name
, TYPE_VALUES (enumtype
));
14925 return e
? TREE_VALUE (e
) : NULL_TREE
;
14929 /* We're defining DECL. Make sure that its type is OK. */
14932 check_function_type (tree decl
, tree current_function_parms
)
14934 tree fntype
= TREE_TYPE (decl
);
14935 tree return_type
= complete_type (TREE_TYPE (fntype
));
14937 /* In a function definition, arg types must be complete. */
14938 require_complete_types_for_parms (current_function_parms
);
14940 if (dependent_type_p (return_type
)
14941 || type_uses_auto (return_type
))
14943 if (!COMPLETE_OR_VOID_TYPE_P (return_type
))
14945 tree args
= TYPE_ARG_TYPES (fntype
);
14947 error ("return type %q#T is incomplete", return_type
);
14949 /* Make it return void instead. */
14950 if (TREE_CODE (fntype
) == METHOD_TYPE
)
14951 fntype
= build_method_type_directly (TREE_TYPE (TREE_VALUE (args
)),
14953 TREE_CHAIN (args
));
14955 fntype
= build_function_type (void_type_node
, args
);
14956 fntype
= (cp_build_type_attribute_variant
14957 (fntype
, TYPE_ATTRIBUTES (TREE_TYPE (decl
))));
14958 fntype
= cxx_copy_lang_qualifiers (fntype
, TREE_TYPE (decl
));
14959 TREE_TYPE (decl
) = fntype
;
14963 abstract_virtuals_error (decl
, TREE_TYPE (fntype
));
14964 maybe_warn_parm_abi (TREE_TYPE (fntype
),
14965 DECL_SOURCE_LOCATION (decl
));
14969 /* True iff FN is an implicitly-defined default constructor. */
14972 implicit_default_ctor_p (tree fn
)
14974 return (DECL_CONSTRUCTOR_P (fn
)
14975 && !user_provided_p (fn
)
14976 && sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (fn
)));
14979 /* Clobber the contents of *this to let the back end know that the object
14980 storage is dead when we enter the constructor or leave the destructor. */
14983 build_clobber_this ()
14985 /* Clobbering an empty base is pointless, and harmful if its one byte
14986 TYPE_SIZE overlays real data. */
14987 if (is_empty_class (current_class_type
))
14990 /* If we have virtual bases, clobber the whole object, but only if we're in
14991 charge. If we don't have virtual bases, clobber the as-base type so we
14992 don't mess with tail padding. */
14993 bool vbases
= CLASSTYPE_VBASECLASSES (current_class_type
);
14995 tree ctype
= current_class_type
;
14997 ctype
= CLASSTYPE_AS_BASE (ctype
);
14999 tree clobber
= build_clobber (ctype
);
15001 tree thisref
= current_class_ref
;
15002 if (ctype
!= current_class_type
)
15004 thisref
= build_nop (build_reference_type (ctype
), current_class_ptr
);
15005 thisref
= convert_from_reference (thisref
);
15008 tree exprstmt
= build2 (MODIFY_EXPR
, void_type_node
, thisref
, clobber
);
15010 exprstmt
= build_if_in_charge (exprstmt
);
15015 /* Create the FUNCTION_DECL for a function definition.
15016 DECLSPECS and DECLARATOR are the parts of the declaration;
15017 they describe the function's name and the type it returns,
15018 but twisted together in a fashion that parallels the syntax of C.
15020 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
15021 DECLARATOR is really the DECL for the function we are about to
15022 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
15023 indicating that the function is an inline defined in-class.
15025 This function creates a binding context for the function body
15026 as well as setting up the FUNCTION_DECL in current_function_decl.
15028 For C++, we must first check whether that datum makes any sense.
15029 For example, "class A local_a(1,2);" means that variable local_a
15030 is an aggregate of type A, which should have a constructor
15031 applied to it with the argument list [1, 2].
15033 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
15034 or may be a BLOCK if the function has been defined previously
15035 in this translation unit. On exit, DECL_INITIAL (decl1) will be
15036 error_mark_node if the function has never been defined, or
15037 a BLOCK if the function has been defined somewhere. */
15040 start_preparsed_function (tree decl1
, tree attrs
, int flags
)
15042 tree ctype
= NULL_TREE
;
15045 int doing_friend
= 0;
15046 cp_binding_level
*bl
;
15047 tree current_function_parms
;
15048 struct c_fileinfo
*finfo
15049 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1
)));
15050 bool honor_interface
;
15052 /* Sanity check. */
15053 gcc_assert (VOID_TYPE_P (TREE_VALUE (void_list_node
)));
15054 gcc_assert (TREE_CHAIN (void_list_node
) == NULL_TREE
);
15056 fntype
= TREE_TYPE (decl1
);
15057 if (TREE_CODE (fntype
) == METHOD_TYPE
)
15058 ctype
= TYPE_METHOD_BASETYPE (fntype
);
15060 /* ISO C++ 11.4/5. A friend function defined in a class is in
15061 the (lexical) scope of the class in which it is defined. */
15062 if (!ctype
&& DECL_FRIEND_P (decl1
))
15064 ctype
= DECL_FRIEND_CONTEXT (decl1
);
15066 /* CTYPE could be null here if we're dealing with a template;
15067 for example, `inline friend float foo()' inside a template
15068 will have no CTYPE set. */
15069 if (ctype
&& TREE_CODE (ctype
) != RECORD_TYPE
)
15075 if (DECL_DECLARED_INLINE_P (decl1
)
15076 && lookup_attribute ("noinline", attrs
))
15077 warning_at (DECL_SOURCE_LOCATION (decl1
), 0,
15078 "inline function %qD given attribute noinline", decl1
);
15080 /* Handle gnu_inline attribute. */
15081 if (GNU_INLINE_P (decl1
))
15083 DECL_EXTERNAL (decl1
) = 1;
15084 DECL_NOT_REALLY_EXTERN (decl1
) = 0;
15085 DECL_INTERFACE_KNOWN (decl1
) = 1;
15086 DECL_DISREGARD_INLINE_LIMITS (decl1
) = 1;
15089 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1
))
15090 /* This is a constructor, we must ensure that any default args
15091 introduced by this definition are propagated to the clones
15092 now. The clones are used directly in overload resolution. */
15093 adjust_clone_args (decl1
);
15095 /* Sometimes we don't notice that a function is a static member, and
15096 build a METHOD_TYPE for it. Fix that up now. */
15097 gcc_assert (!(ctype
!= NULL_TREE
&& DECL_STATIC_FUNCTION_P (decl1
)
15098 && TREE_CODE (TREE_TYPE (decl1
)) == METHOD_TYPE
));
15100 /* Set up current_class_type, and enter the scope of the class, if
15103 push_nested_class (ctype
);
15104 else if (DECL_STATIC_FUNCTION_P (decl1
))
15105 push_nested_class (DECL_CONTEXT (decl1
));
15107 /* Now that we have entered the scope of the class, we must restore
15108 the bindings for any template parameters surrounding DECL1, if it
15109 is an inline member template. (Order is important; consider the
15110 case where a template parameter has the same name as a field of
15111 the class.) It is not until after this point that
15112 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
15113 if (flags
& SF_INCLASS_INLINE
)
15114 maybe_begin_member_template_processing (decl1
);
15116 /* Effective C++ rule 15. */
15118 && DECL_ASSIGNMENT_OPERATOR_P (decl1
)
15119 && DECL_OVERLOADED_OPERATOR_IS (decl1
, NOP_EXPR
)
15120 && VOID_TYPE_P (TREE_TYPE (fntype
)))
15121 warning (OPT_Weffc__
,
15122 "%<operator=%> should return a reference to %<*this%>");
15124 /* Make the init_value nonzero so pushdecl knows this is not tentative.
15125 error_mark_node is replaced below (in poplevel) with the BLOCK. */
15126 if (!DECL_INITIAL (decl1
))
15127 DECL_INITIAL (decl1
) = error_mark_node
;
15129 /* This function exists in static storage.
15130 (This does not mean `static' in the C sense!) */
15131 TREE_STATIC (decl1
) = 1;
15133 /* We must call push_template_decl after current_class_type is set
15134 up. (If we are processing inline definitions after exiting a
15135 class scope, current_class_type will be NULL_TREE until set above
15136 by push_nested_class.) */
15137 if (processing_template_decl
)
15139 tree newdecl1
= push_template_decl (decl1
);
15140 if (newdecl1
== error_mark_node
)
15142 if (ctype
|| DECL_STATIC_FUNCTION_P (decl1
))
15143 pop_nested_class ();
15149 /* Make sure the parameter and return types are reasonable. When
15150 you declare a function, these types can be incomplete, but they
15151 must be complete when you define the function. */
15152 check_function_type (decl1
, DECL_ARGUMENTS (decl1
));
15154 /* Build the return declaration for the function. */
15155 restype
= TREE_TYPE (fntype
);
15157 if (DECL_RESULT (decl1
) == NULL_TREE
)
15161 resdecl
= build_decl (input_location
, RESULT_DECL
, 0, restype
);
15162 DECL_ARTIFICIAL (resdecl
) = 1;
15163 DECL_IGNORED_P (resdecl
) = 1;
15164 DECL_RESULT (decl1
) = resdecl
;
15166 cp_apply_type_quals_to_decl (cp_type_quals (restype
), resdecl
);
15169 /* Record the decl so that the function name is defined.
15170 If we already have a decl for this name, and it is a FUNCTION_DECL,
15171 use the old decl. */
15172 if (!processing_template_decl
&& !(flags
& SF_PRE_PARSED
))
15174 /* A specialization is not used to guide overload resolution. */
15175 if (!DECL_FUNCTION_MEMBER_P (decl1
)
15176 && !(DECL_USE_TEMPLATE (decl1
) &&
15177 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1
))))
15179 tree olddecl
= pushdecl (decl1
);
15181 if (olddecl
== error_mark_node
)
15182 /* If something went wrong when registering the declaration,
15183 use DECL1; we have to have a FUNCTION_DECL to use when
15184 parsing the body of the function. */
15188 /* Otherwise, OLDDECL is either a previous declaration
15189 of the same function or DECL1 itself. */
15191 if (warn_missing_declarations
15192 && olddecl
== decl1
15193 && !DECL_MAIN_P (decl1
)
15194 && TREE_PUBLIC (decl1
)
15195 && !DECL_DECLARED_INLINE_P (decl1
))
15199 /* Check whether DECL1 is in an anonymous
15201 for (context
= DECL_CONTEXT (decl1
);
15203 context
= DECL_CONTEXT (context
))
15205 if (TREE_CODE (context
) == NAMESPACE_DECL
15206 && DECL_NAME (context
) == NULL_TREE
)
15210 if (context
== NULL
)
15211 warning_at (DECL_SOURCE_LOCATION (decl1
),
15212 OPT_Wmissing_declarations
,
15213 "no previous declaration for %qD", decl1
);
15221 /* We need to set the DECL_CONTEXT. */
15222 if (!DECL_CONTEXT (decl1
) && DECL_TEMPLATE_INFO (decl1
))
15223 DECL_CONTEXT (decl1
) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1
));
15225 fntype
= TREE_TYPE (decl1
);
15226 restype
= TREE_TYPE (fntype
);
15228 /* If #pragma weak applies, mark the decl appropriately now.
15229 The pragma only applies to global functions. Because
15230 determining whether or not the #pragma applies involves
15231 computing the mangled name for the declaration, we cannot
15232 apply the pragma until after we have merged this declaration
15233 with any previous declarations; if the original declaration
15234 has a linkage specification, that specification applies to
15235 the definition as well, and may affect the mangled name. */
15236 if (DECL_FILE_SCOPE_P (decl1
))
15237 maybe_apply_pragma_weak (decl1
);
15240 /* We are now in the scope of the function being defined. */
15241 current_function_decl
= decl1
;
15243 /* Save the parm names or decls from this function's declarator
15244 where store_parm_decls will find them. */
15245 current_function_parms
= DECL_ARGUMENTS (decl1
);
15247 /* Let the user know we're compiling this function. */
15248 announce_function (decl1
);
15250 gcc_assert (DECL_INITIAL (decl1
));
15252 /* This function may already have been parsed, in which case just
15253 return; our caller will skip over the body without parsing. */
15254 if (DECL_INITIAL (decl1
) != error_mark_node
)
15257 /* Initialize RTL machinery. We cannot do this until
15258 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
15259 even when processing a template; this is how we get
15260 CFUN set up, and our per-function variables initialized.
15261 FIXME factor out the non-RTL stuff. */
15262 bl
= current_binding_level
;
15263 allocate_struct_function (decl1
, processing_template_decl
);
15265 /* Initialize the language data structures. Whenever we start
15266 a new function, we destroy temporaries in the usual way. */
15267 cfun
->language
= ggc_cleared_alloc
<language_function
> ();
15268 current_stmt_tree ()->stmts_are_full_exprs_p
= 1;
15269 current_binding_level
= bl
;
15271 if (!processing_template_decl
&& type_uses_auto (restype
))
15273 FNDECL_USED_AUTO (decl1
) = true;
15274 current_function_auto_return_pattern
= restype
;
15277 /* Start the statement-tree, start the tree now. */
15278 DECL_SAVED_TREE (decl1
) = push_stmt_list ();
15280 /* If we are (erroneously) defining a function that we have already
15281 defined before, wipe out what we knew before. */
15282 if (!DECL_PENDING_INLINE_P (decl1
))
15283 DECL_SAVED_FUNCTION_DATA (decl1
) = NULL
;
15285 if (ctype
&& !doing_friend
&& !DECL_STATIC_FUNCTION_P (decl1
))
15287 /* We know that this was set up by `grokclassfn'. We do not
15288 wait until `store_parm_decls', since evil parse errors may
15289 never get us to that point. Here we keep the consistency
15290 between `current_class_type' and `current_class_ptr'. */
15291 tree t
= DECL_ARGUMENTS (decl1
);
15293 gcc_assert (t
!= NULL_TREE
&& TREE_CODE (t
) == PARM_DECL
);
15294 gcc_assert (TYPE_PTR_P (TREE_TYPE (t
)));
15296 cp_function_chain
->x_current_class_ref
15297 = cp_build_fold_indirect_ref (t
);
15298 /* Set this second to avoid shortcut in cp_build_indirect_ref. */
15299 cp_function_chain
->x_current_class_ptr
= t
;
15301 /* Constructors and destructors need to know whether they're "in
15302 charge" of initializing virtual base classes. */
15303 t
= DECL_CHAIN (t
);
15304 if (DECL_HAS_IN_CHARGE_PARM_P (decl1
))
15306 current_in_charge_parm
= t
;
15307 t
= DECL_CHAIN (t
);
15309 if (DECL_HAS_VTT_PARM_P (decl1
))
15311 gcc_assert (DECL_NAME (t
) == vtt_parm_identifier
);
15312 current_vtt_parm
= t
;
15316 honor_interface
= (!DECL_TEMPLATE_INSTANTIATION (decl1
)
15317 /* Implicitly-defined methods (like the
15318 destructor for a class in which no destructor
15319 is explicitly declared) must not be defined
15320 until their definition is needed. So, we
15321 ignore interface specifications for
15322 compiler-generated functions. */
15323 && !DECL_ARTIFICIAL (decl1
));
15325 if (processing_template_decl
)
15326 /* Don't mess with interface flags. */;
15327 else if (DECL_INTERFACE_KNOWN (decl1
))
15329 tree ctx
= decl_function_context (decl1
);
15331 if (DECL_NOT_REALLY_EXTERN (decl1
))
15332 DECL_EXTERNAL (decl1
) = 0;
15334 if (ctx
!= NULL_TREE
&& vague_linkage_p (ctx
))
15335 /* This is a function in a local class in an extern inline
15336 or template function. */
15337 comdat_linkage (decl1
);
15339 /* If this function belongs to an interface, it is public.
15340 If it belongs to someone else's interface, it is also external.
15341 This only affects inlines and template instantiations. */
15342 else if (!finfo
->interface_unknown
&& honor_interface
)
15344 if (DECL_DECLARED_INLINE_P (decl1
)
15345 || DECL_TEMPLATE_INSTANTIATION (decl1
))
15347 DECL_EXTERNAL (decl1
)
15348 = (finfo
->interface_only
15349 || (DECL_DECLARED_INLINE_P (decl1
)
15350 && ! flag_implement_inlines
15351 && !DECL_VINDEX (decl1
)));
15353 /* For WIN32 we also want to put these in linkonce sections. */
15354 maybe_make_one_only (decl1
);
15357 DECL_EXTERNAL (decl1
) = 0;
15358 DECL_INTERFACE_KNOWN (decl1
) = 1;
15359 /* If this function is in an interface implemented in this file,
15360 make sure that the back end knows to emit this function
15362 if (!DECL_EXTERNAL (decl1
))
15363 mark_needed (decl1
);
15365 else if (finfo
->interface_unknown
&& finfo
->interface_only
15366 && honor_interface
)
15368 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
15369 interface, we will have both finfo->interface_unknown and
15370 finfo->interface_only set. In that case, we don't want to
15371 use the normal heuristics because someone will supply a
15372 #pragma implementation elsewhere, and deducing it here would
15373 produce a conflict. */
15374 comdat_linkage (decl1
);
15375 DECL_EXTERNAL (decl1
) = 0;
15376 DECL_INTERFACE_KNOWN (decl1
) = 1;
15377 DECL_DEFER_OUTPUT (decl1
) = 1;
15381 /* This is a definition, not a reference.
15382 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
15383 if (!GNU_INLINE_P (decl1
))
15384 DECL_EXTERNAL (decl1
) = 0;
15386 if ((DECL_DECLARED_INLINE_P (decl1
)
15387 || DECL_TEMPLATE_INSTANTIATION (decl1
))
15388 && ! DECL_INTERFACE_KNOWN (decl1
))
15389 DECL_DEFER_OUTPUT (decl1
) = 1;
15391 DECL_INTERFACE_KNOWN (decl1
) = 1;
15394 /* Determine the ELF visibility attribute for the function. We must not
15395 do this before calling "pushdecl", as we must allow "duplicate_decls"
15396 to merge any attributes appropriately. We also need to wait until
15398 if (!DECL_CLONED_FUNCTION_P (decl1
))
15399 determine_visibility (decl1
);
15401 if (!processing_template_decl
)
15402 maybe_instantiate_noexcept (decl1
);
15404 begin_scope (sk_function_parms
, decl1
);
15408 if (DECL_DESTRUCTOR_P (decl1
)
15409 || (DECL_CONSTRUCTOR_P (decl1
)
15410 && targetm
.cxx
.cdtor_returns_this ()))
15412 cdtor_label
= create_artificial_label (input_location
);
15413 LABEL_DECL_CDTOR (cdtor_label
) = true;
15416 start_fname_decls ();
15418 store_parm_decls (current_function_parms
);
15420 if (!processing_template_decl
15421 && (flag_lifetime_dse
> 1)
15422 && DECL_CONSTRUCTOR_P (decl1
)
15423 && !DECL_CLONED_FUNCTION_P (decl1
)
15424 /* Clobbering an empty base is harmful if it overlays real data. */
15425 && !is_empty_class (current_class_type
)
15426 /* We can't clobber safely for an implicitly-defined default constructor
15427 because part of the initialization might happen before we enter the
15428 constructor, via AGGR_INIT_ZERO_FIRST (c++/68006). */
15429 && !implicit_default_ctor_p (decl1
))
15430 finish_expr_stmt (build_clobber_this ());
15432 if (!processing_template_decl
15433 && DECL_CONSTRUCTOR_P (decl1
)
15434 && sanitize_flags_p (SANITIZE_VPTR
)
15435 && !DECL_CLONED_FUNCTION_P (decl1
)
15436 && !implicit_default_ctor_p (decl1
))
15437 cp_ubsan_maybe_initialize_vtbl_ptrs (current_class_ptr
);
15439 start_lambda_scope (decl1
);
15445 /* Like start_preparsed_function, except that instead of a
15446 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
15448 Returns true on success. If the DECLARATOR is not suitable
15449 for a function, we return false, which tells the parser to
15450 skip the entire function. */
15453 start_function (cp_decl_specifier_seq
*declspecs
,
15454 const cp_declarator
*declarator
,
15459 decl1
= grokdeclarator (declarator
, declspecs
, FUNCDEF
, 1, &attrs
);
15460 invoke_plugin_callbacks (PLUGIN_START_PARSE_FUNCTION
, decl1
);
15461 if (decl1
== error_mark_node
)
15463 /* If the declarator is not suitable for a function definition,
15464 cause a syntax error. */
15465 if (decl1
== NULL_TREE
|| TREE_CODE (decl1
) != FUNCTION_DECL
)
15467 error ("invalid function declaration");
15471 if (DECL_MAIN_P (decl1
))
15472 /* main must return int. grokfndecl should have corrected it
15473 (and issued a diagnostic) if the user got it wrong. */
15474 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1
)),
15475 integer_type_node
));
15477 return start_preparsed_function (decl1
, attrs
, /*flags=*/SF_DEFAULT
);
15480 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
15484 use_eh_spec_block (tree fn
)
15486 return (flag_exceptions
&& flag_enforce_eh_specs
15487 && !processing_template_decl
15488 && !type_throw_all_p (TREE_TYPE (fn
))
15489 /* We insert the EH_SPEC_BLOCK only in the original
15490 function; then, it is copied automatically to the
15492 && !DECL_CLONED_FUNCTION_P (fn
)
15493 /* Implicitly-generated constructors and destructors have
15494 exception specifications. However, those specifications
15495 are the union of the possible exceptions specified by the
15496 constructors/destructors for bases and members, so no
15497 unallowed exception will ever reach this function. By
15498 not creating the EH_SPEC_BLOCK we save a little memory,
15499 and we avoid spurious warnings about unreachable
15501 && !DECL_DEFAULTED_FN (fn
));
15504 /* Store the parameter declarations into the current function declaration.
15505 This is called after parsing the parameter declarations, before
15506 digesting the body of the function.
15508 Also install to binding contour return value identifier, if any. */
15511 store_parm_decls (tree current_function_parms
)
15513 tree fndecl
= current_function_decl
;
15516 /* This is a chain of any other decls that came in among the parm
15517 declarations. If a parm is declared with enum {foo, bar} x;
15518 then CONST_DECLs for foo and bar are put here. */
15519 tree nonparms
= NULL_TREE
;
15521 if (current_function_parms
)
15523 /* This case is when the function was defined with an ANSI prototype.
15524 The parms already have decls, so we need not do anything here
15525 except record them as in effect
15526 and complain if any redundant old-style parm decls were written. */
15528 tree specparms
= current_function_parms
;
15531 /* Must clear this because it might contain TYPE_DECLs declared
15533 current_binding_level
->names
= NULL
;
15535 /* If we're doing semantic analysis, then we'll call pushdecl
15536 for each of these. We must do them in reverse order so that
15537 they end in the correct forward order. */
15538 specparms
= nreverse (specparms
);
15540 for (parm
= specparms
; parm
; parm
= next
)
15542 next
= DECL_CHAIN (parm
);
15543 if (TREE_CODE (parm
) == PARM_DECL
)
15547 /* If we find an enum constant or a type tag,
15548 put it aside for the moment. */
15549 TREE_CHAIN (parm
) = NULL_TREE
;
15550 nonparms
= chainon (nonparms
, parm
);
15554 /* Get the decls in their original chain order and record in the
15555 function. This is all and only the PARM_DECLs that were
15556 pushed into scope by the loop above. */
15557 DECL_ARGUMENTS (fndecl
) = get_local_decls ();
15560 DECL_ARGUMENTS (fndecl
) = NULL_TREE
;
15562 /* Now store the final chain of decls for the arguments
15563 as the decl-chain of the current lexical scope.
15564 Put the enumerators in as well, at the front so that
15565 DECL_ARGUMENTS is not modified. */
15566 current_binding_level
->names
= chainon (nonparms
, DECL_ARGUMENTS (fndecl
));
15568 if (use_eh_spec_block (current_function_decl
))
15569 current_eh_spec_block
= begin_eh_spec_block ();
15573 /* We have finished doing semantic analysis on DECL, but have not yet
15574 generated RTL for its body. Save away our current state, so that
15575 when we want to generate RTL later we know what to do. */
15578 save_function_data (tree decl
)
15580 struct language_function
*f
;
15582 /* Save the language-specific per-function data so that we can
15583 get it back when we really expand this function. */
15584 gcc_assert (!DECL_PENDING_INLINE_P (decl
));
15587 f
= ggc_alloc
<language_function
> ();
15588 memcpy (f
, cp_function_chain
, sizeof (struct language_function
));
15589 DECL_SAVED_FUNCTION_DATA (decl
) = f
;
15591 /* Clear out the bits we don't need. */
15592 f
->base
.x_stmt_tree
.x_cur_stmt_list
= NULL
;
15593 f
->bindings
= NULL
;
15594 f
->x_local_names
= NULL
;
15595 f
->base
.local_typedefs
= NULL
;
15599 /* Set the return value of the constructor (if present). */
15602 finish_constructor_body (void)
15607 if (targetm
.cxx
.cdtor_returns_this ())
15609 /* Any return from a constructor will end up here. */
15610 add_stmt (build_stmt (input_location
, LABEL_EXPR
, cdtor_label
));
15612 val
= DECL_ARGUMENTS (current_function_decl
);
15613 val
= build2 (MODIFY_EXPR
, TREE_TYPE (val
),
15614 DECL_RESULT (current_function_decl
), val
);
15615 /* Return the address of the object. */
15616 exprstmt
= build_stmt (input_location
, RETURN_EXPR
, val
);
15617 add_stmt (exprstmt
);
15621 /* Do all the processing for the beginning of a destructor; set up the
15622 vtable pointers and cleanups for bases and members. */
15625 begin_destructor_body (void)
15627 tree compound_stmt
;
15629 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
15630 issued an error message. We still want to try to process the
15631 body of the function, but initialize_vtbl_ptrs will crash if
15632 TYPE_BINFO is NULL. */
15633 if (COMPLETE_TYPE_P (current_class_type
))
15635 compound_stmt
= begin_compound_stmt (0);
15636 /* Make all virtual function table pointers in non-virtual base
15637 classes point to CURRENT_CLASS_TYPE's virtual function
15639 initialize_vtbl_ptrs (current_class_ptr
);
15640 finish_compound_stmt (compound_stmt
);
15642 if (flag_lifetime_dse
15643 /* Clobbering an empty base is harmful if it overlays real data. */
15644 && !is_empty_class (current_class_type
))
15646 if (sanitize_flags_p (SANITIZE_VPTR
)
15647 && (flag_sanitize_recover
& SANITIZE_VPTR
) == 0
15648 && TYPE_CONTAINS_VPTR_P (current_class_type
))
15650 tree binfo
= TYPE_BINFO (current_class_type
);
15652 = cp_build_fold_indirect_ref (current_class_ptr
);
15654 tree vtbl_ptr
= build_vfield_ref (ref
, TREE_TYPE (binfo
));
15655 tree vtbl
= build_zero_cst (TREE_TYPE (vtbl_ptr
));
15656 tree stmt
= cp_build_modify_expr (input_location
, vtbl_ptr
,
15658 tf_warning_or_error
);
15659 /* If the vptr is shared with some virtual nearly empty base,
15660 don't clear it if not in charge, the dtor of the virtual
15661 nearly empty base will do that later. */
15662 if (CLASSTYPE_VBASECLASSES (current_class_type
)
15663 && CLASSTYPE_PRIMARY_BINFO (current_class_type
)
15665 (CLASSTYPE_PRIMARY_BINFO (current_class_type
)))
15667 stmt
= convert_to_void (stmt
, ICV_STATEMENT
,
15668 tf_warning_or_error
);
15669 stmt
= build_if_in_charge (stmt
);
15671 finish_decl_cleanup (NULL_TREE
, stmt
);
15674 finish_decl_cleanup (NULL_TREE
, build_clobber_this ());
15677 /* And insert cleanups for our bases and members so that they
15678 will be properly destroyed if we throw. */
15679 push_base_cleanups ();
15683 /* At the end of every destructor we generate code to delete the object if
15684 necessary. Do that now. */
15687 finish_destructor_body (void)
15691 /* Any return from a destructor will end up here; that way all base
15692 and member cleanups will be run when the function returns. */
15693 add_stmt (build_stmt (input_location
, LABEL_EXPR
, cdtor_label
));
15695 if (targetm
.cxx
.cdtor_returns_this ())
15699 val
= DECL_ARGUMENTS (current_function_decl
);
15700 val
= build2 (MODIFY_EXPR
, TREE_TYPE (val
),
15701 DECL_RESULT (current_function_decl
), val
);
15702 /* Return the address of the object. */
15703 exprstmt
= build_stmt (input_location
, RETURN_EXPR
, val
);
15704 add_stmt (exprstmt
);
15708 /* Do the necessary processing for the beginning of a function body, which
15709 in this case includes member-initializers, but not the catch clauses of
15710 a function-try-block. Currently, this means opening a binding level
15711 for the member-initializers (in a ctor), member cleanups (in a dtor),
15712 and capture proxies (in a lambda operator()). */
15715 begin_function_body (void)
15719 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl
))
15722 if (processing_template_decl
)
15723 /* Do nothing now. */;
15725 /* Always keep the BLOCK node associated with the outermost pair of
15726 curly braces of a function. These are needed for correct
15727 operation of dwarfout.c. */
15728 keep_next_level (true);
15730 stmt
= begin_compound_stmt (BCS_FN_BODY
);
15732 if (processing_template_decl
)
15733 /* Do nothing now. */;
15734 else if (DECL_DESTRUCTOR_P (current_function_decl
))
15735 begin_destructor_body ();
15740 /* Do the processing for the end of a function body. Currently, this means
15741 closing out the cleanups for fully-constructed bases and members, and in
15742 the case of the destructor, deleting the object if desired. Again, this
15743 is only meaningful for [cd]tors, since they are the only functions where
15744 there is a significant distinction between the main body and any
15745 function catch clauses. Handling, say, main() return semantics here
15746 would be wrong, as flowing off the end of a function catch clause for
15747 main() would also need to return 0. */
15750 finish_function_body (tree compstmt
)
15752 if (compstmt
== NULL_TREE
)
15755 /* Close the block. */
15756 finish_compound_stmt (compstmt
);
15758 if (processing_template_decl
)
15759 /* Do nothing now. */;
15760 else if (DECL_CONSTRUCTOR_P (current_function_decl
))
15761 finish_constructor_body ();
15762 else if (DECL_DESTRUCTOR_P (current_function_decl
))
15763 finish_destructor_body ();
15766 /* Given a function, returns the BLOCK corresponding to the outermost level
15767 of curly braces, skipping the artificial block created for constructor
15771 outer_curly_brace_block (tree fndecl
)
15773 tree block
= DECL_INITIAL (fndecl
);
15774 if (BLOCK_OUTER_CURLY_BRACE_P (block
))
15776 block
= BLOCK_SUBBLOCKS (block
);
15777 if (BLOCK_OUTER_CURLY_BRACE_P (block
))
15779 block
= BLOCK_SUBBLOCKS (block
);
15780 gcc_assert (BLOCK_OUTER_CURLY_BRACE_P (block
));
15784 /* If FNDECL is a class's key method, add the class to the list of
15785 keyed classes that should be emitted. */
15788 record_key_method_defined (tree fndecl
)
15790 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl
)
15791 && DECL_VIRTUAL_P (fndecl
)
15792 && !processing_template_decl
)
15794 tree fnclass
= DECL_CONTEXT (fndecl
);
15795 if (fndecl
== CLASSTYPE_KEY_METHOD (fnclass
))
15796 vec_safe_push (keyed_classes
, fnclass
);
15800 /* Subroutine of finish_function.
15801 Save the body of constexpr functions for possible
15802 future compile time evaluation. */
15805 maybe_save_function_definition (tree fun
)
15807 if (!processing_template_decl
15808 && DECL_DECLARED_CONSTEXPR_P (fun
)
15809 && !cp_function_chain
->invalid_constexpr
15810 && !DECL_CLONED_FUNCTION_P (fun
))
15811 register_constexpr_fundef (fun
, DECL_SAVED_TREE (fun
));
15814 /* Attempt to add a fix-it hint to RICHLOC suggesting the insertion
15815 of "return *this;" immediately before its location, using FNDECL's
15816 first statement (if any) to give the indentation, if appropriate. */
15819 add_return_star_this_fixit (gcc_rich_location
*richloc
, tree fndecl
)
15821 location_t indent
= UNKNOWN_LOCATION
;
15822 tree stmts
= expr_first (DECL_SAVED_TREE (fndecl
));
15824 indent
= EXPR_LOCATION (stmts
);
15825 richloc
->add_fixit_insert_formatted ("return *this;",
15826 richloc
->get_loc (),
15830 /* Finish up a function declaration and compile that function
15831 all the way to assembler language output. The free the storage
15832 for the function definition. INLINE_P is TRUE if we just
15833 finished processing the body of an in-class inline function
15834 definition. (This processing will have taken place after the
15835 class definition is complete.) */
15838 finish_function (bool inline_p
)
15840 tree fndecl
= current_function_decl
;
15841 tree fntype
, ctype
= NULL_TREE
;
15843 /* When we get some parse errors, we can end up without a
15844 current_function_decl, so cope. */
15845 if (fndecl
== NULL_TREE
)
15846 return error_mark_node
;
15848 finish_lambda_scope ();
15850 if (c_dialect_objc ())
15851 objc_finish_function ();
15853 record_key_method_defined (fndecl
);
15855 fntype
= TREE_TYPE (fndecl
);
15857 /* TREE_READONLY (fndecl) = 1;
15858 This caused &foo to be of type ptr-to-const-function
15859 which then got a warning when stored in a ptr-to-function variable. */
15861 gcc_assert (building_stmt_list_p ());
15862 /* The current function is being defined, so its DECL_INITIAL should
15863 be set, and unless there's a multiple definition, it should be
15864 error_mark_node. */
15865 gcc_assert (DECL_INITIAL (fndecl
) == error_mark_node
);
15867 /* For a cloned function, we've already got all the code we need;
15868 there's no need to add any extra bits. */
15869 if (!DECL_CLONED_FUNCTION_P (fndecl
))
15871 /* Make it so that `main' always returns 0 by default. */
15872 if (DECL_MAIN_P (current_function_decl
))
15873 finish_return_stmt (integer_zero_node
);
15875 if (use_eh_spec_block (current_function_decl
))
15876 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
15877 (TREE_TYPE (current_function_decl
)),
15878 current_eh_spec_block
);
15881 /* If we're saving up tree structure, tie off the function now. */
15882 DECL_SAVED_TREE (fndecl
) = pop_stmt_list (DECL_SAVED_TREE (fndecl
));
15884 finish_fname_decls ();
15886 /* If this function can't throw any exceptions, remember that. */
15887 if (!processing_template_decl
15888 && !cp_function_chain
->can_throw
15889 && !flag_non_call_exceptions
15890 && !decl_replaceable_p (fndecl
))
15891 TREE_NOTHROW (fndecl
) = 1;
15893 /* This must come after expand_function_end because cleanups might
15894 have declarations (from inline functions) that need to go into
15895 this function's blocks. */
15897 /* If the current binding level isn't the outermost binding level
15898 for this function, either there is a bug, or we have experienced
15899 syntax errors and the statement tree is malformed. */
15900 if (current_binding_level
->kind
!= sk_function_parms
)
15902 /* Make sure we have already experienced errors. */
15903 gcc_assert (errorcount
);
15905 /* Throw away the broken statement tree and extra binding
15907 DECL_SAVED_TREE (fndecl
) = alloc_stmt_list ();
15909 while (current_binding_level
->kind
!= sk_function_parms
)
15911 if (current_binding_level
->kind
== sk_class
)
15912 pop_nested_class ();
15914 poplevel (0, 0, 0);
15917 poplevel (1, 0, 1);
15919 /* Statements should always be full-expressions at the outermost set
15920 of curly braces for a function. */
15921 gcc_assert (stmts_are_full_exprs_p ());
15923 /* If there are no return statements in a function with auto return type,
15924 the return type is void. But if the declared type is something like
15925 auto*, this is an error. */
15926 if (!processing_template_decl
&& FNDECL_USED_AUTO (fndecl
)
15927 && TREE_TYPE (fntype
) == current_function_auto_return_pattern
)
15929 if (is_auto (current_function_auto_return_pattern
))
15931 apply_deduced_return_type (fndecl
, void_type_node
);
15932 fntype
= TREE_TYPE (fndecl
);
15934 else if (!current_function_returns_value
15935 && !current_function_returns_null
)
15937 error ("no return statements in function returning %qT",
15938 current_function_auto_return_pattern
);
15939 inform (input_location
, "only plain %<auto%> return type can be "
15940 "deduced to %<void%>");
15944 // If this is a concept, check that the definition is reasonable.
15945 if (DECL_DECLARED_CONCEPT_P (fndecl
))
15946 check_function_concept (fndecl
);
15948 /* Lambda closure members are implicitly constexpr if possible. */
15949 if (cxx_dialect
>= cxx17
15950 && LAMBDA_TYPE_P (CP_DECL_CONTEXT (fndecl
)))
15951 DECL_DECLARED_CONSTEXPR_P (fndecl
)
15952 = ((processing_template_decl
15953 || is_valid_constexpr_fn (fndecl
, /*complain*/false))
15954 && potential_constant_expression (DECL_SAVED_TREE (fndecl
)));
15956 /* Save constexpr function body before it gets munged by
15957 the NRV transformation. */
15958 maybe_save_function_definition (fndecl
);
15960 /* Invoke the pre-genericize plugin before we start munging things. */
15961 if (!processing_template_decl
)
15962 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE
, fndecl
);
15964 /* Perform delayed folding before NRV transformation. */
15965 if (!processing_template_decl
)
15966 cp_fold_function (fndecl
);
15968 /* Set up the named return value optimization, if we can. Candidate
15969 variables are selected in check_return_expr. */
15970 if (current_function_return_value
)
15972 tree r
= current_function_return_value
;
15975 if (r
!= error_mark_node
15976 /* This is only worth doing for fns that return in memory--and
15977 simpler, since we don't have to worry about promoted modes. */
15978 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl
)), fndecl
)
15979 /* Only allow this for variables declared in the outer scope of
15980 the function so we know that their lifetime always ends with a
15981 return; see g++.dg/opt/nrv6.C. We could be more flexible if
15982 we were to do this optimization in tree-ssa. */
15983 && (outer
= outer_curly_brace_block (fndecl
))
15984 && chain_member (r
, BLOCK_VARS (outer
)))
15985 finalize_nrv (&DECL_SAVED_TREE (fndecl
), r
, DECL_RESULT (fndecl
));
15987 current_function_return_value
= NULL_TREE
;
15990 /* Remember that we were in class scope. */
15991 if (current_class_name
)
15992 ctype
= current_class_type
;
15994 /* Must mark the RESULT_DECL as being in this function. */
15995 DECL_CONTEXT (DECL_RESULT (fndecl
)) = fndecl
;
15997 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
15998 to the FUNCTION_DECL node itself. */
15999 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl
)) = fndecl
;
16001 /* Save away current state, if appropriate. */
16002 if (!processing_template_decl
)
16003 save_function_data (fndecl
);
16005 /* Complain if there's just no return statement. */
16006 if (warn_return_type
16007 && !VOID_TYPE_P (TREE_TYPE (fntype
))
16008 && !dependent_type_p (TREE_TYPE (fntype
))
16009 && !current_function_returns_value
&& !current_function_returns_null
16010 /* Don't complain if we abort or throw. */
16011 && !current_function_returns_abnormally
16012 /* Don't complain if there's an infinite loop. */
16013 && !current_function_infinite_loop
16014 /* Don't complain if we are declared noreturn. */
16015 && !TREE_THIS_VOLATILE (fndecl
)
16016 && !DECL_NAME (DECL_RESULT (fndecl
))
16017 && !TREE_NO_WARNING (fndecl
)
16018 /* Structor return values (if any) are set by the compiler. */
16019 && !DECL_CONSTRUCTOR_P (fndecl
)
16020 && !DECL_DESTRUCTOR_P (fndecl
)
16021 && targetm
.warn_func_return (fndecl
))
16023 gcc_rich_location
richloc (input_location
);
16024 /* Potentially add a "return *this;" fix-it hint for
16025 assignment operators. */
16026 if (IDENTIFIER_ASSIGN_OP_P (DECL_NAME (fndecl
)))
16028 tree valtype
= TREE_TYPE (DECL_RESULT (fndecl
));
16029 if (TREE_CODE (valtype
) == REFERENCE_TYPE
16030 && same_type_ignoring_top_level_qualifiers_p
16031 (TREE_TYPE (valtype
), TREE_TYPE (current_class_ref
)))
16032 if (global_dc
->option_enabled (OPT_Wreturn_type
,
16033 global_dc
->option_state
))
16034 add_return_star_this_fixit (&richloc
, fndecl
);
16036 warning_at (&richloc
, OPT_Wreturn_type
,
16037 "no return statement in function returning non-void");
16038 TREE_NO_WARNING (fndecl
) = 1;
16041 /* Store the end of the function, so that we get good line number
16042 info for the epilogue. */
16043 cfun
->function_end_locus
= input_location
;
16045 /* Complain about parameters that are only set, but never otherwise used. */
16046 if (warn_unused_but_set_parameter
16047 && !processing_template_decl
16048 && errorcount
== unused_but_set_errorcount
16049 && !DECL_CLONED_FUNCTION_P (fndecl
))
16053 for (decl
= DECL_ARGUMENTS (fndecl
);
16055 decl
= DECL_CHAIN (decl
))
16056 if (TREE_USED (decl
)
16057 && TREE_CODE (decl
) == PARM_DECL
16058 && !DECL_READ_P (decl
)
16059 && DECL_NAME (decl
)
16060 && !DECL_ARTIFICIAL (decl
)
16061 && !TREE_NO_WARNING (decl
)
16062 && !DECL_IN_SYSTEM_HEADER (decl
)
16063 && TREE_TYPE (decl
) != error_mark_node
16064 && !TYPE_REF_P (TREE_TYPE (decl
))
16065 && (!CLASS_TYPE_P (TREE_TYPE (decl
))
16066 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl
))))
16067 warning_at (DECL_SOURCE_LOCATION (decl
),
16068 OPT_Wunused_but_set_parameter
,
16069 "parameter %qD set but not used", decl
);
16070 unused_but_set_errorcount
= errorcount
;
16073 /* Complain about locally defined typedefs that are not used in this
16075 maybe_warn_unused_local_typedefs ();
16077 /* Possibly warn about unused parameters. */
16078 if (warn_unused_parameter
16079 && !processing_template_decl
16080 && !DECL_CLONED_FUNCTION_P (fndecl
))
16081 do_warn_unused_parameter (fndecl
);
16083 /* Genericize before inlining. */
16084 if (!processing_template_decl
)
16086 struct language_function
*f
= DECL_SAVED_FUNCTION_DATA (fndecl
);
16087 cp_genericize (fndecl
);
16088 /* Clear out the bits we don't need. */
16089 f
->x_current_class_ptr
= NULL
;
16090 f
->x_current_class_ref
= NULL
;
16091 f
->x_eh_spec_block
= NULL
;
16092 f
->x_in_charge_parm
= NULL
;
16093 f
->x_vtt_parm
= NULL
;
16094 f
->x_return_value
= NULL
;
16095 f
->bindings
= NULL
;
16096 f
->extern_decl_map
= NULL
;
16097 f
->infinite_loops
= NULL
;
16099 /* Clear out the bits we don't need. */
16100 local_names
= NULL
;
16102 /* We're leaving the context of this function, so zap cfun. It's still in
16103 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
16105 current_function_decl
= NULL
;
16107 /* If this is an in-class inline definition, we may have to pop the
16108 bindings for the template parameters that we added in
16109 maybe_begin_member_template_processing when start_function was
16112 maybe_end_member_template_processing ();
16114 /* Leave the scope of the class. */
16116 pop_nested_class ();
16121 current_function_decl
= NULL_TREE
;
16123 invoke_plugin_callbacks (PLUGIN_FINISH_PARSE_FUNCTION
, fndecl
);
16127 /* Create the FUNCTION_DECL for a function definition.
16128 DECLSPECS and DECLARATOR are the parts of the declaration;
16129 they describe the return type and the name of the function,
16130 but twisted together in a fashion that parallels the syntax of C.
16132 This function creates a binding context for the function body
16133 as well as setting up the FUNCTION_DECL in current_function_decl.
16135 Returns a FUNCTION_DECL on success.
16137 If the DECLARATOR is not suitable for a function (it defines a datum
16138 instead), we return 0, which tells yyparse to report a parse error.
16140 May return void_type_node indicating that this method is actually
16141 a friend. See grokfield for more details.
16143 Came here with a `.pushlevel' .
16145 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
16146 CHANGES TO CODE IN `grokfield'. */
16149 grokmethod (cp_decl_specifier_seq
*declspecs
,
16150 const cp_declarator
*declarator
, tree attrlist
)
16152 tree fndecl
= grokdeclarator (declarator
, declspecs
, MEMFUNCDEF
, 0,
16155 if (fndecl
== error_mark_node
)
16156 return error_mark_node
;
16158 if (fndecl
== NULL
|| TREE_CODE (fndecl
) != FUNCTION_DECL
)
16160 error ("invalid member function declaration");
16161 return error_mark_node
;
16165 cplus_decl_attributes (&fndecl
, attrlist
, 0);
16167 /* Pass friends other than inline friend functions back. */
16168 if (fndecl
== void_type_node
)
16171 if (DECL_IN_AGGR_P (fndecl
))
16173 if (DECL_CLASS_SCOPE_P (fndecl
))
16174 error ("%qD is already defined in class %qT", fndecl
,
16175 DECL_CONTEXT (fndecl
));
16176 return error_mark_node
;
16179 check_template_shadow (fndecl
);
16181 if (TREE_PUBLIC (fndecl
))
16182 DECL_COMDAT (fndecl
) = 1;
16183 DECL_DECLARED_INLINE_P (fndecl
) = 1;
16184 DECL_NO_INLINE_WARNING_P (fndecl
) = 1;
16186 /* We process method specializations in finish_struct_1. */
16187 if (processing_template_decl
&& !DECL_TEMPLATE_SPECIALIZATION (fndecl
))
16189 fndecl
= push_template_decl (fndecl
);
16190 if (fndecl
== error_mark_node
)
16194 if (! DECL_FRIEND_P (fndecl
))
16196 if (DECL_CHAIN (fndecl
))
16198 fndecl
= copy_node (fndecl
);
16199 TREE_CHAIN (fndecl
) = NULL_TREE
;
16203 cp_finish_decl (fndecl
, NULL_TREE
, false, NULL_TREE
, 0);
16205 DECL_IN_AGGR_P (fndecl
) = 1;
16210 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
16211 we can lay it out later, when and if its type becomes complete.
16213 Also handle constexpr variables where the initializer involves
16214 an unlowered PTRMEM_CST because the class isn't complete yet. */
16217 maybe_register_incomplete_var (tree var
)
16219 gcc_assert (VAR_P (var
));
16221 /* Keep track of variables with incomplete types. */
16222 if (!processing_template_decl
&& TREE_TYPE (var
) != error_mark_node
16223 && DECL_EXTERNAL (var
))
16225 tree inner_type
= TREE_TYPE (var
);
16227 while (TREE_CODE (inner_type
) == ARRAY_TYPE
)
16228 inner_type
= TREE_TYPE (inner_type
);
16229 inner_type
= TYPE_MAIN_VARIANT (inner_type
);
16231 if ((!COMPLETE_TYPE_P (inner_type
) && CLASS_TYPE_P (inner_type
))
16232 /* RTTI TD entries are created while defining the type_info. */
16233 || (TYPE_LANG_SPECIFIC (inner_type
)
16234 && TYPE_BEING_DEFINED (inner_type
)))
16236 incomplete_var iv
= {var
, inner_type
};
16237 vec_safe_push (incomplete_vars
, iv
);
16239 else if (!(DECL_LANG_SPECIFIC (var
) && DECL_TEMPLATE_INFO (var
))
16240 && decl_constant_var_p (var
)
16241 && (TYPE_PTRMEM_P (inner_type
) || CLASS_TYPE_P (inner_type
)))
16243 /* When the outermost open class is complete we can resolve any
16244 pointers-to-members. */
16245 tree context
= outermost_open_class ();
16246 incomplete_var iv
= {var
, context
};
16247 vec_safe_push (incomplete_vars
, iv
);
16252 /* Called when a class type (given by TYPE) is defined. If there are
16253 any existing VAR_DECLs whose type has been completed by this
16254 declaration, update them now. */
16257 complete_vars (tree type
)
16260 incomplete_var
*iv
;
16262 for (ix
= 0; vec_safe_iterate (incomplete_vars
, ix
, &iv
); )
16264 if (same_type_p (type
, iv
->incomplete_type
))
16266 tree var
= iv
->decl
;
16267 tree type
= TREE_TYPE (var
);
16269 if (type
!= error_mark_node
16270 && (TYPE_MAIN_VARIANT (strip_array_types (type
))
16271 == iv
->incomplete_type
))
16273 /* Complete the type of the variable. The VAR_DECL itself
16274 will be laid out in expand_expr. */
16275 complete_type (type
);
16276 cp_apply_type_quals_to_decl (cp_type_quals (type
), var
);
16279 /* Remove this entry from the list. */
16280 incomplete_vars
->unordered_remove (ix
);
16286 /* Check for pending declarations which may have abstract type. */
16287 complete_type_check_abstract (type
);
16290 /* If DECL is of a type which needs a cleanup, build and return an
16291 expression to perform that cleanup here. Return NULL_TREE if no
16292 cleanup need be done. DECL can also be a _REF when called from
16293 split_nonconstant_init_1. */
16296 cxx_maybe_build_cleanup (tree decl
, tsubst_flags_t complain
)
16302 /* Assume no cleanup is required. */
16303 cleanup
= NULL_TREE
;
16305 if (error_operand_p (decl
))
16308 /* Handle "__attribute__((cleanup))". We run the cleanup function
16309 before the destructor since the destructor is what actually
16310 terminates the lifetime of the object. */
16312 attr
= lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl
));
16321 /* Get the name specified by the user for the cleanup function. */
16322 id
= TREE_VALUE (TREE_VALUE (attr
));
16323 /* Look up the name to find the cleanup function to call. It is
16324 important to use lookup_name here because that is what is
16325 used in c-common.c:handle_cleanup_attribute when performing
16326 initial checks on the attribute. Note that those checks
16327 include ensuring that the function found is not an overloaded
16328 function, or an object with an overloaded call operator,
16329 etc.; we can rely on the fact that the function found is an
16330 ordinary FUNCTION_DECL. */
16331 fn
= lookup_name (id
);
16332 arg
= build_address (decl
);
16333 if (!mark_used (decl
, complain
) && !(complain
& tf_error
))
16334 return error_mark_node
;
16335 cleanup
= cp_build_function_call_nary (fn
, complain
, arg
, NULL_TREE
);
16336 if (cleanup
== error_mark_node
)
16337 return error_mark_node
;
16339 /* Handle ordinary C++ destructors. */
16340 type
= TREE_TYPE (decl
);
16341 if (type_build_dtor_call (type
))
16343 int flags
= LOOKUP_NORMAL
|LOOKUP_NONVIRTUAL
|LOOKUP_DESTRUCTOR
;
16347 if (TREE_CODE (type
) == ARRAY_TYPE
)
16350 addr
= build_address (decl
);
16352 call
= build_delete (TREE_TYPE (addr
), addr
,
16353 sfk_complete_destructor
, flags
, 0, complain
);
16354 if (call
== error_mark_node
)
16355 cleanup
= error_mark_node
;
16356 else if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type
))
16357 /* Discard the call. */;
16359 cleanup
= cp_build_compound_expr (cleanup
, call
, complain
);
16364 /* build_delete sets the location of the destructor call to the
16365 current location, even though the destructor is going to be
16366 called later, at the end of the current scope. This can lead to
16367 a "jumpy" behavior for users of debuggers when they step around
16368 the end of the block. So let's unset the location of the
16369 destructor call instead. */
16370 protected_set_expr_location (cleanup
, UNKNOWN_LOCATION
);
16374 && !lookup_attribute ("warn_unused", TYPE_ATTRIBUTES (TREE_TYPE (decl
)))
16375 /* Treat objects with destructors as used; the destructor may do
16376 something substantive. */
16377 && !mark_used (decl
, complain
) && !(complain
& tf_error
))
16378 return error_mark_node
;
16384 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
16385 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
16386 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
16389 static_fn_type (tree memfntype
)
16394 if (TYPE_PTRMEMFUNC_P (memfntype
))
16395 memfntype
= TYPE_PTRMEMFUNC_FN_TYPE (memfntype
);
16396 if (INDIRECT_TYPE_P (memfntype
)
16397 || TREE_CODE (memfntype
) == FUNCTION_DECL
)
16398 memfntype
= TREE_TYPE (memfntype
);
16399 if (TREE_CODE (memfntype
) == FUNCTION_TYPE
)
16401 gcc_assert (TREE_CODE (memfntype
) == METHOD_TYPE
);
16402 args
= TYPE_ARG_TYPES (memfntype
);
16403 fntype
= build_function_type (TREE_TYPE (memfntype
), TREE_CHAIN (args
));
16404 fntype
= apply_memfn_quals (fntype
, type_memfn_quals (memfntype
));
16405 fntype
= (cp_build_type_attribute_variant
16406 (fntype
, TYPE_ATTRIBUTES (memfntype
)));
16407 fntype
= cxx_copy_lang_qualifiers (fntype
, memfntype
);
16411 /* DECL was originally constructed as a non-static member function,
16412 but turned out to be static. Update it accordingly. */
16415 revert_static_member_fn (tree decl
)
16417 tree stype
= static_fn_type (decl
);
16418 cp_cv_quals quals
= type_memfn_quals (stype
);
16419 cp_ref_qualifier rqual
= type_memfn_rqual (stype
);
16421 if (quals
!= TYPE_UNQUALIFIED
|| rqual
!= REF_QUAL_NONE
)
16422 stype
= apply_memfn_quals (stype
, TYPE_UNQUALIFIED
, REF_QUAL_NONE
);
16424 TREE_TYPE (decl
) = stype
;
16426 if (DECL_ARGUMENTS (decl
))
16427 DECL_ARGUMENTS (decl
) = DECL_CHAIN (DECL_ARGUMENTS (decl
));
16428 DECL_STATIC_FUNCTION_P (decl
) = 1;
16431 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
16432 one of the language-independent trees. */
16434 enum cp_tree_node_structure_enum
16435 cp_tree_node_structure (union lang_tree_node
* t
)
16437 switch (TREE_CODE (&t
->generic
))
16439 case DEFAULT_ARG
: return TS_CP_DEFAULT_ARG
;
16440 case DEFERRED_NOEXCEPT
: return TS_CP_DEFERRED_NOEXCEPT
;
16441 case IDENTIFIER_NODE
: return TS_CP_IDENTIFIER
;
16442 case OVERLOAD
: return TS_CP_OVERLOAD
;
16443 case TEMPLATE_PARM_INDEX
: return TS_CP_TPI
;
16444 case PTRMEM_CST
: return TS_CP_PTRMEM
;
16445 case BASELINK
: return TS_CP_BASELINK
;
16446 case TEMPLATE_DECL
: return TS_CP_TEMPLATE_DECL
;
16447 case STATIC_ASSERT
: return TS_CP_STATIC_ASSERT
;
16448 case ARGUMENT_PACK_SELECT
: return TS_CP_ARGUMENT_PACK_SELECT
;
16449 case TRAIT_EXPR
: return TS_CP_TRAIT_EXPR
;
16450 case LAMBDA_EXPR
: return TS_CP_LAMBDA_EXPR
;
16451 case TEMPLATE_INFO
: return TS_CP_TEMPLATE_INFO
;
16452 case CONSTRAINT_INFO
: return TS_CP_CONSTRAINT_INFO
;
16453 case USERDEF_LITERAL
: return TS_CP_USERDEF_LITERAL
;
16454 default: return TS_CP_GENERIC
;
16458 /* Build the void_list_node (void_type_node having been created). */
16460 build_void_list_node (void)
16462 tree t
= build_tree_list (NULL_TREE
, void_type_node
);
16467 cp_missing_noreturn_ok_p (tree decl
)
16469 /* A missing noreturn is ok for the `main' function. */
16470 return DECL_MAIN_P (decl
);
16473 /* Return the decl used to identify the COMDAT group into which DECL should
16477 cxx_comdat_group (tree decl
)
16479 /* Virtual tables, construction virtual tables, and virtual table
16480 tables all go in a single COMDAT group, named after the primary
16482 if (VAR_P (decl
) && DECL_VTABLE_OR_VTT_P (decl
))
16483 decl
= CLASSTYPE_VTABLES (DECL_CONTEXT (decl
));
16484 /* For all other DECLs, the COMDAT group is the mangled name of the
16485 declaration itself. */
16488 while (DECL_THUNK_P (decl
))
16490 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
16491 into the same section as the target function. In that case
16492 we must return target's name. */
16493 tree target
= THUNK_TARGET (decl
);
16494 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target
)
16495 && DECL_SECTION_NAME (target
) != NULL
16496 && DECL_ONE_ONLY (target
))
16506 /* Returns the return type for FN as written by the user, which may include
16507 a placeholder for a deduced return type. */
16510 fndecl_declared_return_type (tree fn
)
16512 fn
= STRIP_TEMPLATE (fn
);
16513 if (FNDECL_USED_AUTO (fn
))
16515 struct language_function
*f
= NULL
;
16516 if (DECL_STRUCT_FUNCTION (fn
))
16517 f
= DECL_STRUCT_FUNCTION (fn
)->language
;
16519 f
= DECL_SAVED_FUNCTION_DATA (fn
);
16520 return f
->x_auto_return_pattern
;
16522 return TREE_TYPE (TREE_TYPE (fn
));
16525 /* Returns true iff DECL is a variable or function declared with an auto type
16526 that has not yet been deduced to a real type. */
16529 undeduced_auto_decl (tree decl
)
16531 if (cxx_dialect
< cxx11
)
16533 return ((VAR_OR_FUNCTION_DECL_P (decl
)
16534 || TREE_CODE (decl
) == TEMPLATE_DECL
)
16535 && type_uses_auto (TREE_TYPE (decl
)));
16538 /* Complain if DECL has an undeduced return type. */
16541 require_deduced_type (tree decl
, tsubst_flags_t complain
)
16543 if (undeduced_auto_decl (decl
))
16545 if (complain
& tf_error
)
16546 error ("use of %qD before deduction of %<auto%>", decl
);
16552 #include "gt-cp-decl.h"