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
, location_t
);
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
&& in_template_function ()
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 /* As we're using pushdecl_with_scope, we must set the context. */
4478 DECL_CONTEXT (decl
) = current_function_decl
;
4480 TREE_READONLY (decl
) = 1;
4481 DECL_ARTIFICIAL (decl
) = 1;
4482 DECL_DECLARED_CONSTEXPR_P (decl
) = 1;
4483 TREE_STATIC (decl
) = 1;
4485 TREE_USED (decl
) = 1;
4489 SET_DECL_VALUE_EXPR (decl
, init
);
4490 DECL_HAS_VALUE_EXPR_P (decl
) = 1;
4491 /* For decl_constant_var_p. */
4492 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
) = 1;
4495 if (current_function_decl
)
4497 DECL_CONTEXT (decl
) = current_function_decl
;
4498 decl
= pushdecl_outermost_localscope (decl
);
4499 if (decl
!= error_mark_node
)
4500 add_decl_expr (decl
);
4504 DECL_THIS_STATIC (decl
) = true;
4505 pushdecl_top_level_and_finish (decl
, NULL_TREE
);
4512 builtin_function_1 (tree decl
, tree context
, bool is_global
)
4514 tree id
= DECL_NAME (decl
);
4515 const char *name
= IDENTIFIER_POINTER (id
);
4517 retrofit_lang_decl (decl
);
4519 DECL_ARTIFICIAL (decl
) = 1;
4520 SET_DECL_LANGUAGE (decl
, lang_c
);
4521 /* Runtime library routines are, by definition, available in an
4522 external shared object. */
4523 DECL_VISIBILITY (decl
) = VISIBILITY_DEFAULT
;
4524 DECL_VISIBILITY_SPECIFIED (decl
) = 1;
4526 DECL_CONTEXT (decl
) = context
;
4528 /* A function in the user's namespace should have an explicit
4529 declaration before it is used. Mark the built-in function as
4530 anticipated but not actually declared. */
4531 if (name
[0] != '_' || name
[1] != '_')
4532 DECL_ANTICIPATED (decl
) = 1;
4533 else if (strncmp (name
+ 2, "builtin_", strlen ("builtin_")) != 0)
4535 size_t len
= strlen (name
);
4537 /* Treat __*_chk fortification functions as anticipated as well,
4538 unless they are __builtin_*. */
4539 if (len
> strlen ("___chk")
4540 && memcmp (name
+ len
- strlen ("_chk"),
4541 "_chk", strlen ("_chk") + 1) == 0)
4542 DECL_ANTICIPATED (decl
) = 1;
4546 pushdecl_top_level (decl
);
4554 cxx_builtin_function (tree decl
)
4556 tree id
= DECL_NAME (decl
);
4557 const char *name
= IDENTIFIER_POINTER (id
);
4558 /* All builtins that don't begin with an '_' should additionally
4559 go in the 'std' namespace. */
4562 tree decl2
= copy_node(decl
);
4563 push_namespace (std_identifier
);
4564 builtin_function_1 (decl2
, std_node
, false);
4568 return builtin_function_1 (decl
, NULL_TREE
, false);
4571 /* Like cxx_builtin_function, but guarantee the function is added to the global
4572 scope. This is to allow function specific options to add new machine
4573 dependent builtins when the target ISA changes via attribute((target(...)))
4574 which saves space on program startup if the program does not use non-generic
4578 cxx_builtin_function_ext_scope (tree decl
)
4581 tree id
= DECL_NAME (decl
);
4582 const char *name
= IDENTIFIER_POINTER (id
);
4583 /* All builtins that don't begin with an '_' should additionally
4584 go in the 'std' namespace. */
4587 tree decl2
= copy_node(decl
);
4588 push_namespace (std_identifier
);
4589 builtin_function_1 (decl2
, std_node
, true);
4593 return builtin_function_1 (decl
, NULL_TREE
, true);
4596 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
4597 function. Not called directly. */
4600 build_library_fn (tree name
, enum tree_code operator_code
, tree type
,
4603 tree fn
= build_lang_decl (FUNCTION_DECL
, name
, type
);
4604 DECL_EXTERNAL (fn
) = 1;
4605 TREE_PUBLIC (fn
) = 1;
4606 DECL_ARTIFICIAL (fn
) = 1;
4607 DECL_OVERLOADED_OPERATOR_CODE_RAW (fn
)
4608 = OVL_OP_INFO (false, operator_code
)->ovl_op_code
;
4609 SET_DECL_LANGUAGE (fn
, lang_c
);
4610 /* Runtime library routines are, by definition, available in an
4611 external shared object. */
4612 DECL_VISIBILITY (fn
) = VISIBILITY_DEFAULT
;
4613 DECL_VISIBILITY_SPECIFIED (fn
) = 1;
4614 set_call_expr_flags (fn
, ecf_flags
);
4618 /* Returns the _DECL for a library function with C++ linkage. */
4621 build_cp_library_fn (tree name
, enum tree_code operator_code
, tree type
,
4624 tree fn
= build_library_fn (name
, operator_code
, type
, ecf_flags
);
4625 DECL_CONTEXT (fn
) = FROB_CONTEXT (current_namespace
);
4626 SET_DECL_LANGUAGE (fn
, lang_cplusplus
);
4630 /* Like build_library_fn, but takes a C string instead of an
4634 build_library_fn_ptr (const char* name
, tree type
, int ecf_flags
)
4636 return build_library_fn (get_identifier (name
), ERROR_MARK
, type
, ecf_flags
);
4639 /* Like build_cp_library_fn, but takes a C string instead of an
4643 build_cp_library_fn_ptr (const char* name
, tree type
, int ecf_flags
)
4645 return build_cp_library_fn (get_identifier (name
), ERROR_MARK
, type
,
4649 /* Like build_library_fn, but also pushes the function so that we will
4650 be able to find it via get_global_binding. Also, the function
4651 may throw exceptions listed in RAISES. */
4654 push_library_fn (tree name
, tree type
, tree raises
, int ecf_flags
)
4659 type
= build_exception_variant (type
, raises
);
4661 fn
= build_library_fn (name
, ERROR_MARK
, type
, ecf_flags
);
4662 pushdecl_top_level (fn
);
4666 /* Like build_cp_library_fn, but also pushes the function so that it
4667 will be found by normal lookup. */
4670 push_cp_library_fn (enum tree_code operator_code
, tree type
,
4673 tree fn
= build_cp_library_fn (ovl_op_identifier (false, operator_code
),
4674 operator_code
, type
, ecf_flags
);
4677 apply_tm_attr (fn
, get_identifier ("transaction_safe"));
4681 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
4685 push_void_library_fn (tree name
, tree parmtypes
, int ecf_flags
)
4687 tree type
= build_function_type (void_type_node
, parmtypes
);
4688 return push_library_fn (name
, type
, NULL_TREE
, ecf_flags
);
4691 /* Like push_library_fn, but also note that this function throws
4692 and does not return. Used for __throw_foo and the like. */
4695 push_throw_library_fn (tree name
, tree type
)
4697 tree fn
= push_library_fn (name
, type
, NULL_TREE
, ECF_NORETURN
| ECF_COLD
);
4701 /* When we call finish_struct for an anonymous union, we create
4702 default copy constructors and such. But, an anonymous union
4703 shouldn't have such things; this function undoes the damage to the
4704 anonymous union type T.
4706 (The reason that we create the synthesized methods is that we don't
4707 distinguish `union { int i; }' from `typedef union { int i; } U'.
4708 The first is an anonymous union; the second is just an ordinary
4712 fixup_anonymous_aggr (tree t
)
4714 /* Wipe out memory of synthesized methods. */
4715 TYPE_HAS_USER_CONSTRUCTOR (t
) = 0;
4716 TYPE_HAS_DEFAULT_CONSTRUCTOR (t
) = 0;
4717 TYPE_HAS_COPY_CTOR (t
) = 0;
4718 TYPE_HAS_CONST_COPY_CTOR (t
) = 0;
4719 TYPE_HAS_COPY_ASSIGN (t
) = 0;
4720 TYPE_HAS_CONST_COPY_ASSIGN (t
) = 0;
4722 /* Splice the implicitly generated functions out of TYPE_FIELDS. */
4723 for (tree probe
, *prev_p
= &TYPE_FIELDS (t
); (probe
= *prev_p
);)
4724 if (TREE_CODE (probe
) == FUNCTION_DECL
&& DECL_ARTIFICIAL (probe
))
4725 *prev_p
= DECL_CHAIN (probe
);
4727 prev_p
= &DECL_CHAIN (probe
);
4729 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
4730 assignment operators (because they cannot have these methods themselves).
4731 For anonymous unions this is already checked because they are not allowed
4732 in any union, otherwise we have to check it. */
4733 if (TREE_CODE (t
) != UNION_TYPE
)
4737 for (field
= TYPE_FIELDS (t
); field
; field
= DECL_CHAIN (field
))
4738 if (TREE_CODE (field
) == FIELD_DECL
)
4740 type
= TREE_TYPE (field
);
4741 if (CLASS_TYPE_P (type
))
4743 if (TYPE_NEEDS_CONSTRUCTING (type
))
4744 error ("member %q+#D with constructor not allowed "
4745 "in anonymous aggregate", field
);
4746 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
))
4747 error ("member %q+#D with destructor not allowed "
4748 "in anonymous aggregate", field
);
4749 if (TYPE_HAS_COMPLEX_COPY_ASSIGN (type
))
4750 error ("member %q+#D with copy assignment operator "
4751 "not allowed in anonymous aggregate", field
);
4757 /* Warn for an attribute located at LOCATION that appertains to the
4758 class type CLASS_TYPE that has not been properly placed after its
4759 class-key, in it class-specifier. */
4762 warn_misplaced_attr_for_class_type (source_location location
,
4765 gcc_assert (OVERLOAD_TYPE_P (class_type
));
4767 auto_diagnostic_group d
;
4768 if (warning_at (location
, OPT_Wattributes
,
4769 "attribute ignored in declaration "
4770 "of %q#T", class_type
))
4772 "attribute for %q#T must follow the %qs keyword",
4773 class_type
, class_key_or_enum_as_string (class_type
));
4776 /* Make sure that a declaration with no declarator is well-formed, i.e.
4777 just declares a tagged type or anonymous union.
4779 Returns the type declared; or NULL_TREE if none. */
4782 check_tag_decl (cp_decl_specifier_seq
*declspecs
,
4783 bool explicit_type_instantiation_p
)
4785 int saw_friend
= decl_spec_seq_has_spec_p (declspecs
, ds_friend
);
4786 int saw_typedef
= decl_spec_seq_has_spec_p (declspecs
, ds_typedef
);
4787 /* If a class, struct, or enum type is declared by the DECLSPECS
4788 (i.e, if a class-specifier, enum-specifier, or non-typename
4789 elaborated-type-specifier appears in the DECLSPECS),
4790 DECLARED_TYPE is set to the corresponding type. */
4791 tree declared_type
= NULL_TREE
;
4792 bool error_p
= false;
4794 if (declspecs
->multiple_types_p
)
4795 error ("multiple types in one declaration");
4796 else if (declspecs
->redefined_builtin_type
)
4798 if (!in_system_header_at (input_location
))
4799 permerror (declspecs
->locations
[ds_redefined_builtin_type_spec
],
4800 "redeclaration of C++ built-in type %qT",
4801 declspecs
->redefined_builtin_type
);
4806 && TYPE_P (declspecs
->type
)
4807 && ((TREE_CODE (declspecs
->type
) != TYPENAME_TYPE
4808 && MAYBE_CLASS_TYPE_P (declspecs
->type
))
4809 || TREE_CODE (declspecs
->type
) == ENUMERAL_TYPE
))
4810 declared_type
= declspecs
->type
;
4811 else if (declspecs
->type
== error_mark_node
)
4813 if (declared_type
== NULL_TREE
&& ! saw_friend
&& !error_p
)
4814 permerror (input_location
, "declaration does not declare anything");
4815 else if (declared_type
!= NULL_TREE
&& type_uses_auto (declared_type
))
4817 error_at (declspecs
->locations
[ds_type_spec
],
4818 "%<auto%> can only be specified for variables "
4819 "or function declarations");
4820 return error_mark_node
;
4822 /* Check for an anonymous union. */
4823 else if (declared_type
&& RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type
))
4824 && TYPE_UNNAMED_P (declared_type
))
4826 /* 7/3 In a simple-declaration, the optional init-declarator-list
4827 can be omitted only when declaring a class (clause 9) or
4828 enumeration (7.2), that is, when the decl-specifier-seq contains
4829 either a class-specifier, an elaborated-type-specifier with
4830 a class-key (9.1), or an enum-specifier. In these cases and
4831 whenever a class-specifier or enum-specifier is present in the
4832 decl-specifier-seq, the identifiers in these specifiers are among
4833 the names being declared by the declaration (as class-name,
4834 enum-names, or enumerators, depending on the syntax). In such
4835 cases, and except for the declaration of an unnamed bit-field (9.6),
4836 the decl-specifier-seq shall introduce one or more names into the
4837 program, or shall redeclare a name introduced by a previous
4838 declaration. [Example:
4839 enum { }; // ill-formed
4840 typedef class { }; // ill-formed
4844 error ("missing type-name in typedef-declaration");
4847 /* Anonymous unions are objects, so they can have specifiers. */;
4848 SET_ANON_AGGR_TYPE_P (declared_type
);
4850 if (TREE_CODE (declared_type
) != UNION_TYPE
4851 && !in_system_header_at (input_location
))
4852 pedwarn (input_location
, OPT_Wpedantic
, "ISO C++ prohibits anonymous structs");
4857 if (decl_spec_seq_has_spec_p (declspecs
, ds_inline
))
4858 error_at (declspecs
->locations
[ds_inline
],
4859 "%<inline%> can only be specified for functions");
4860 else if (decl_spec_seq_has_spec_p (declspecs
, ds_virtual
))
4861 error_at (declspecs
->locations
[ds_virtual
],
4862 "%<virtual%> can only be specified for functions");
4864 && (!current_class_type
4865 || current_scope () != current_class_type
))
4866 error_at (declspecs
->locations
[ds_friend
],
4867 "%<friend%> can only be specified inside a class");
4868 else if (decl_spec_seq_has_spec_p (declspecs
, ds_explicit
))
4869 error_at (declspecs
->locations
[ds_explicit
],
4870 "%<explicit%> can only be specified for constructors");
4871 else if (declspecs
->storage_class
)
4872 error_at (declspecs
->locations
[ds_storage_class
],
4873 "a storage class can only be specified for objects "
4875 else if (decl_spec_seq_has_spec_p (declspecs
, ds_const
))
4876 error_at (declspecs
->locations
[ds_const
],
4877 "%<const%> can only be specified for objects and "
4879 else if (decl_spec_seq_has_spec_p (declspecs
, ds_volatile
))
4880 error_at (declspecs
->locations
[ds_volatile
],
4881 "%<volatile%> can only be specified for objects and "
4883 else if (decl_spec_seq_has_spec_p (declspecs
, ds_restrict
))
4884 error_at (declspecs
->locations
[ds_restrict
],
4885 "%<__restrict%> can only be specified for objects and "
4887 else if (decl_spec_seq_has_spec_p (declspecs
, ds_thread
))
4888 error_at (declspecs
->locations
[ds_thread
],
4889 "%<__thread%> can only be specified for objects "
4891 else if (saw_typedef
)
4892 warning_at (declspecs
->locations
[ds_typedef
], 0,
4893 "%<typedef%> was ignored in this declaration");
4894 else if (decl_spec_seq_has_spec_p (declspecs
, ds_constexpr
))
4895 error_at (declspecs
->locations
[ds_constexpr
],
4896 "%<constexpr%> cannot be used for type declarations");
4899 if (declspecs
->attributes
&& warn_attributes
&& declared_type
)
4902 if (!CLASS_TYPE_P (declared_type
)
4903 || !CLASSTYPE_TEMPLATE_INSTANTIATION (declared_type
))
4904 /* For a non-template class, use the name location. */
4905 loc
= location_of (declared_type
);
4907 /* For a template class (an explicit instantiation), use the
4908 current location. */
4909 loc
= input_location
;
4911 if (explicit_type_instantiation_p
)
4912 /* [dcl.attr.grammar]/4:
4914 No attribute-specifier-seq shall appertain to an explicit
4917 if (warning_at (loc
, OPT_Wattributes
,
4918 "attribute ignored in explicit instantiation %q#T",
4921 "no attribute can be applied to "
4922 "an explicit instantiation");
4925 warn_misplaced_attr_for_class_type (loc
, declared_type
);
4928 return declared_type
;
4931 /* Called when a declaration is seen that contains no names to declare.
4932 If its type is a reference to a structure, union or enum inherited
4933 from a containing scope, shadow that tag name for the current scope
4934 with a forward reference.
4935 If its type defines a new named structure or union
4936 or defines an enum, it is valid but we need not do anything here.
4937 Otherwise, it is an error.
4939 C++: may have to grok the declspecs to learn about static,
4940 complain for anonymous unions.
4942 Returns the TYPE declared -- or NULL_TREE if none. */
4945 shadow_tag (cp_decl_specifier_seq
*declspecs
)
4947 tree t
= check_tag_decl (declspecs
,
4948 /*explicit_type_instantiation_p=*/false);
4953 if (maybe_process_partial_specialization (t
) == error_mark_node
)
4956 /* This is where the variables in an anonymous union are
4957 declared. An anonymous union declaration looks like:
4959 because there is no declarator after the union, the parser
4960 sends that declaration here. */
4961 if (ANON_AGGR_TYPE_P (t
))
4963 fixup_anonymous_aggr (t
);
4965 if (TYPE_FIELDS (t
))
4967 tree decl
= grokdeclarator (/*declarator=*/NULL
,
4968 declspecs
, NORMAL
, 0, NULL
);
4969 finish_anon_union (decl
);
4976 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4979 groktypename (cp_decl_specifier_seq
*type_specifiers
,
4980 const cp_declarator
*declarator
,
4981 bool is_template_arg
)
4985 enum decl_context context
4986 = is_template_arg
? TEMPLATE_TYPE_ARG
: TYPENAME
;
4987 attrs
= type_specifiers
->attributes
;
4988 type_specifiers
->attributes
= NULL_TREE
;
4989 type
= grokdeclarator (declarator
, type_specifiers
, context
, 0, &attrs
);
4990 if (attrs
&& type
!= error_mark_node
)
4992 if (CLASS_TYPE_P (type
))
4993 warning (OPT_Wattributes
, "ignoring attributes applied to class type %qT "
4994 "outside of definition", type
);
4995 else if (MAYBE_CLASS_TYPE_P (type
))
4996 /* A template type parameter or other dependent type. */
4997 warning (OPT_Wattributes
, "ignoring attributes applied to dependent "
4998 "type %qT without an associated declaration", type
);
5000 cplus_decl_attributes (&type
, attrs
, 0);
5005 /* Process a DECLARATOR for a function-scope variable declaration,
5006 namespace-scope variable declaration, or function declaration.
5007 (Function definitions go through start_function; class member
5008 declarations appearing in the body of the class go through
5009 grokfield.) The DECL corresponding to the DECLARATOR is returned.
5010 If an error occurs, the error_mark_node is returned instead.
5012 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
5013 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
5014 for an explicitly defaulted function, or SD_DELETED for an explicitly
5015 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
5016 implicitly initialized via a default constructor. ATTRIBUTES and
5017 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
5019 The scope represented by the context of the returned DECL is pushed
5020 (if it is not the global namespace) and is assigned to
5021 *PUSHED_SCOPE_P. The caller is then responsible for calling
5022 pop_scope on *PUSHED_SCOPE_P if it is set. */
5025 start_decl (const cp_declarator
*declarator
,
5026 cp_decl_specifier_seq
*declspecs
,
5029 tree prefix_attributes
,
5030 tree
*pushed_scope_p
)
5038 *pushed_scope_p
= NULL_TREE
;
5040 /* An object declared as __attribute__((deprecated)) suppresses
5041 warnings of uses of other deprecated items. */
5042 if (lookup_attribute ("deprecated", attributes
))
5043 deprecated_state
= DEPRECATED_SUPPRESS
;
5045 attributes
= chainon (attributes
, prefix_attributes
);
5047 decl
= grokdeclarator (declarator
, declspecs
, NORMAL
, initialized
,
5050 deprecated_state
= DEPRECATED_NORMAL
;
5052 if (decl
== NULL_TREE
|| VOID_TYPE_P (decl
)
5053 || decl
== error_mark_node
)
5054 return error_mark_node
;
5056 context
= CP_DECL_CONTEXT (decl
);
5057 if (context
!= global_namespace
)
5058 *pushed_scope_p
= push_scope (context
);
5060 /* Is it valid for this decl to have an initializer at all?
5061 If not, set INITIALIZED to zero, which will indirectly
5062 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
5064 && TREE_CODE (decl
) == TYPE_DECL
)
5066 error ("typedef %qD is initialized (use decltype instead)", decl
);
5067 return error_mark_node
;
5072 if (! toplevel_bindings_p ()
5073 && DECL_EXTERNAL (decl
))
5074 warning (0, "declaration of %q#D has %<extern%> and is initialized",
5076 DECL_EXTERNAL (decl
) = 0;
5077 if (toplevel_bindings_p ())
5078 TREE_STATIC (decl
) = 1;
5080 alias
= lookup_attribute ("alias", DECL_ATTRIBUTES (decl
)) != 0;
5082 if (alias
&& TREE_CODE (decl
) == FUNCTION_DECL
)
5083 record_key_method_defined (decl
);
5085 /* If this is a typedef that names the class for linkage purposes
5086 (7.1.3p8), apply any attributes directly to the type. */
5087 if (TREE_CODE (decl
) == TYPE_DECL
5088 && OVERLOAD_TYPE_P (TREE_TYPE (decl
))
5089 && decl
== TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl
))))
5090 flags
= ATTR_FLAG_TYPE_IN_PLACE
;
5094 /* Set attributes here so if duplicate decl, will have proper attributes. */
5095 cplus_decl_attributes (&decl
, attributes
, flags
);
5097 /* Dllimported symbols cannot be defined. Static data members (which
5098 can be initialized in-class and dllimported) go through grokfield,
5099 not here, so we don't need to exclude those decls when checking for
5101 if (initialized
&& DECL_DLLIMPORT_P (decl
))
5103 error ("definition of %q#D is marked %<dllimport%>", decl
);
5104 DECL_DLLIMPORT_P (decl
) = 0;
5107 /* If #pragma weak was used, mark the decl weak now. */
5108 if (!processing_template_decl
&& !DECL_DECOMPOSITION_P (decl
))
5109 maybe_apply_pragma_weak (decl
);
5111 if (TREE_CODE (decl
) == FUNCTION_DECL
5112 && DECL_DECLARED_INLINE_P (decl
)
5113 && DECL_UNINLINABLE (decl
)
5114 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl
)))
5115 warning_at (DECL_SOURCE_LOCATION (decl
), 0,
5116 "inline function %qD given attribute noinline", decl
);
5118 if (TYPE_P (context
) && COMPLETE_TYPE_P (complete_type (context
)))
5120 bool this_tmpl
= (processing_template_decl
5121 > template_class_depth (context
));
5124 tree field
= lookup_field (context
, DECL_NAME (decl
), 0, false);
5125 if (field
== NULL_TREE
5126 || !(VAR_P (field
) || variable_template_p (field
)))
5127 error ("%q+#D is not a static data member of %q#T", decl
, context
);
5128 else if (variable_template_p (field
)
5129 && (DECL_LANG_SPECIFIC (decl
)
5130 && DECL_TEMPLATE_SPECIALIZATION (decl
)))
5131 /* OK, specialization was already checked. */;
5132 else if (variable_template_p (field
) && !this_tmpl
)
5134 error_at (DECL_SOURCE_LOCATION (decl
),
5135 "non-member-template declaration of %qD", decl
);
5136 inform (DECL_SOURCE_LOCATION (field
), "does not match "
5137 "member template declaration here");
5138 return error_mark_node
;
5142 if (variable_template_p (field
))
5143 field
= DECL_TEMPLATE_RESULT (field
);
5145 if (DECL_CONTEXT (field
) != context
)
5147 if (!same_type_p (DECL_CONTEXT (field
), context
))
5148 permerror (input_location
, "ISO C++ does not permit %<%T::%D%> "
5149 "to be defined as %<%T::%D%>",
5150 DECL_CONTEXT (field
), DECL_NAME (decl
),
5151 context
, DECL_NAME (decl
));
5152 DECL_CONTEXT (decl
) = DECL_CONTEXT (field
);
5154 /* Static data member are tricky; an in-class initialization
5155 still doesn't provide a definition, so the in-class
5156 declaration will have DECL_EXTERNAL set, but will have an
5157 initialization. Thus, duplicate_decls won't warn
5158 about this situation, and so we check here. */
5159 if (initialized
&& DECL_INITIALIZED_IN_CLASS_P (field
))
5160 error ("duplicate initialization of %qD", decl
);
5161 field
= duplicate_decls (decl
, field
,
5162 /*newdecl_is_friend=*/false);
5163 if (field
== error_mark_node
)
5164 return error_mark_node
;
5171 tree field
= check_classfn (context
, decl
,
5173 ? current_template_parms
5175 if (field
&& field
!= error_mark_node
5176 && duplicate_decls (decl
, field
,
5177 /*newdecl_is_friend=*/false))
5181 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
5182 DECL_IN_AGGR_P (decl
) = 0;
5183 /* Do not mark DECL as an explicit specialization if it was not
5184 already marked as an instantiation; a declaration should
5185 never be marked as a specialization unless we know what
5186 template is being specialized. */
5187 if (DECL_LANG_SPECIFIC (decl
) && DECL_USE_TEMPLATE (decl
))
5189 SET_DECL_TEMPLATE_SPECIALIZATION (decl
);
5190 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5191 DECL_COMDAT (decl
) = (TREE_PUBLIC (decl
)
5192 && DECL_DECLARED_INLINE_P (decl
));
5194 DECL_COMDAT (decl
) = false;
5196 /* [temp.expl.spec] An explicit specialization of a static data
5197 member of a template is a definition if the declaration
5198 includes an initializer; otherwise, it is a declaration.
5200 We check for processing_specialization so this only applies
5201 to the new specialization syntax. */
5202 if (!initialized
&& processing_specialization
)
5203 DECL_EXTERNAL (decl
) = 1;
5206 if (DECL_EXTERNAL (decl
) && ! DECL_TEMPLATE_SPECIALIZATION (decl
)
5207 /* Aliases are definitions. */
5209 permerror (input_location
, "declaration of %q#D outside of class is not definition",
5213 was_public
= TREE_PUBLIC (decl
);
5215 /* Enter this declaration into the symbol table. Don't push the plain
5216 VAR_DECL for a variable template. */
5217 if (!template_parm_scope_p ()
5219 decl
= maybe_push_decl (decl
);
5221 if (processing_template_decl
)
5222 decl
= push_template_decl (decl
);
5223 if (decl
== error_mark_node
)
5224 return error_mark_node
;
5227 && DECL_NAMESPACE_SCOPE_P (decl
) && !TREE_PUBLIC (decl
) && !was_public
5228 && !DECL_THIS_STATIC (decl
) && !DECL_ARTIFICIAL (decl
))
5230 /* This is a const variable with implicit 'static'. Set
5231 DECL_THIS_STATIC so we can tell it from variables that are
5232 !TREE_PUBLIC because of the anonymous namespace. */
5233 gcc_assert (CP_TYPE_CONST_P (TREE_TYPE (decl
)) || errorcount
);
5234 DECL_THIS_STATIC (decl
) = 1;
5237 if (current_function_decl
&& VAR_P (decl
)
5238 && DECL_DECLARED_CONSTEXPR_P (current_function_decl
))
5241 if (CP_DECL_THREAD_LOCAL_P (decl
))
5242 error ("%qD declared %<thread_local%> in %<constexpr%> function",
5244 else if (TREE_STATIC (decl
))
5245 error ("%qD declared %<static%> in %<constexpr%> function", decl
);
5249 cp_function_chain
->invalid_constexpr
= true;
5252 if (!processing_template_decl
&& VAR_P (decl
))
5253 start_decl_1 (decl
, initialized
);
5258 /* Process the declaration of a variable DECL. INITIALIZED is true
5259 iff DECL is explicitly initialized. (INITIALIZED is false if the
5260 variable is initialized via an implicitly-called constructor.)
5261 This function must be called for ordinary variables (including, for
5262 example, implicit instantiations of templates), but must not be
5263 called for template declarations. */
5266 start_decl_1 (tree decl
, bool initialized
)
5270 bool aggregate_definition_p
;
5272 gcc_assert (!processing_template_decl
);
5274 if (error_operand_p (decl
))
5277 gcc_assert (VAR_P (decl
));
5279 type
= TREE_TYPE (decl
);
5280 complete_p
= COMPLETE_TYPE_P (type
);
5281 aggregate_definition_p
= MAYBE_CLASS_TYPE_P (type
) && !DECL_EXTERNAL (decl
);
5283 /* If an explicit initializer is present, or if this is a definition
5284 of an aggregate, then we need a complete type at this point.
5285 (Scalars are always complete types, so there is nothing to
5286 check.) This code just sets COMPLETE_P; errors (if necessary)
5287 are issued below. */
5288 if ((initialized
|| aggregate_definition_p
)
5290 && COMPLETE_TYPE_P (complete_type (type
)))
5293 /* We will not yet have set TREE_READONLY on DECL if the type
5294 was "const", but incomplete, before this point. But, now, we
5295 have a complete type, so we can try again. */
5296 cp_apply_type_quals_to_decl (cp_type_quals (type
), decl
);
5300 /* Is it valid for this decl to have an initializer at all? */
5302 /* Don't allow initializations for incomplete types except for
5303 arrays which might be completed by the initialization. */
5305 ; /* A complete type is ok. */
5306 else if (type_uses_auto (type
))
5307 ; /* An auto type is ok. */
5308 else if (TREE_CODE (type
) != ARRAY_TYPE
)
5310 error ("variable %q#D has initializer but incomplete type", decl
);
5311 type
= TREE_TYPE (decl
) = error_mark_node
;
5313 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type
))))
5315 if (DECL_LANG_SPECIFIC (decl
) && DECL_TEMPLATE_INFO (decl
))
5316 error ("elements of array %q#D have incomplete type", decl
);
5317 /* else we already gave an error in start_decl. */
5320 else if (aggregate_definition_p
&& !complete_p
)
5322 if (type_uses_auto (type
))
5323 gcc_assert (CLASS_PLACEHOLDER_TEMPLATE (type
));
5326 error ("aggregate %q#D has incomplete type and cannot be defined",
5328 /* Change the type so that assemble_variable will give
5329 DECL an rtl we can live with: (mem (const_int 0)). */
5330 type
= TREE_TYPE (decl
) = error_mark_node
;
5334 /* Create a new scope to hold this declaration if necessary.
5335 Whether or not a new scope is necessary cannot be determined
5336 until after the type has been completed; if the type is a
5337 specialization of a class template it is not until after
5338 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
5339 will be set correctly. */
5340 maybe_push_cleanup_level (type
);
5343 /* Handle initialization of references. DECL, TYPE, and INIT have the
5344 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
5345 but will be set to a new CLEANUP_STMT if a temporary is created
5346 that must be destroyed subsequently.
5348 Returns an initializer expression to use to initialize DECL, or
5349 NULL if the initialization can be performed statically.
5351 Quotes on semantics can be found in ARM 8.4.3. */
5354 grok_reference_init (tree decl
, tree type
, tree init
, int flags
)
5356 if (init
== NULL_TREE
)
5358 if ((DECL_LANG_SPECIFIC (decl
) == 0
5359 || DECL_IN_AGGR_P (decl
) == 0)
5360 && ! DECL_THIS_EXTERN (decl
))
5361 error ("%qD declared as reference but not initialized", decl
);
5365 if (TREE_CODE (init
) == TREE_LIST
)
5366 init
= build_x_compound_expr_from_list (init
, ELK_INIT
,
5367 tf_warning_or_error
);
5369 tree ttype
= TREE_TYPE (type
);
5370 if (TREE_CODE (ttype
) != ARRAY_TYPE
5371 && TREE_CODE (TREE_TYPE (init
)) == ARRAY_TYPE
)
5372 /* Note: default conversion is only called in very special cases. */
5373 init
= decay_conversion (init
, tf_warning_or_error
);
5375 /* check_initializer handles this for non-reference variables, but for
5376 references we need to do it here or the initializer will get the
5377 incomplete array type and confuse later calls to
5378 cp_complete_array_type. */
5379 if (TREE_CODE (ttype
) == ARRAY_TYPE
5380 && TYPE_DOMAIN (ttype
) == NULL_TREE
5381 && (BRACE_ENCLOSED_INITIALIZER_P (init
)
5382 || TREE_CODE (init
) == STRING_CST
))
5384 cp_complete_array_type (&ttype
, init
, false);
5385 if (ttype
!= TREE_TYPE (type
))
5386 type
= cp_build_reference_type (ttype
, TYPE_REF_IS_RVALUE (type
));
5389 /* Convert INIT to the reference type TYPE. This may involve the
5390 creation of a temporary, whose lifetime must be the same as that
5391 of the reference. If so, a DECL_EXPR for the temporary will be
5392 added just after the DECL_EXPR for DECL. That's why we don't set
5393 DECL_INITIAL for local references (instead assigning to them
5394 explicitly); we need to allow the temporary to be initialized
5396 return initialize_reference (type
, init
, flags
,
5397 tf_warning_or_error
);
5400 /* Designated initializers in arrays are not supported in GNU C++.
5401 The parser cannot detect this error since it does not know whether
5402 a given brace-enclosed initializer is for a class type or for an
5403 array. This function checks that CE does not use a designated
5404 initializer. If it does, an error is issued. Returns true if CE
5405 is valid, i.e., does not have a designated initializer. */
5408 check_array_designated_initializer (constructor_elt
*ce
,
5409 unsigned HOST_WIDE_INT index
)
5411 /* Designated initializers for array elements are not supported. */
5414 /* The parser only allows identifiers as designated
5416 if (ce
->index
== error_mark_node
)
5418 error ("name used in a GNU-style designated "
5419 "initializer for an array");
5422 else if (identifier_p (ce
->index
))
5424 error ("name %qD used in a GNU-style designated "
5425 "initializer for an array", ce
->index
);
5429 tree ce_index
= build_expr_type_conversion (WANT_INT
| WANT_ENUM
,
5432 && INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (ce_index
))
5433 && (TREE_CODE (ce_index
= fold_non_dependent_expr (ce_index
))
5436 /* A C99 designator is OK if it matches the current index. */
5437 if (wi::to_wide (ce_index
) == index
)
5439 ce
->index
= ce_index
;
5443 sorry ("non-trivial designated initializers not supported");
5446 error ("C99 designator %qE is not an integral constant-expression",
5455 /* When parsing `int a[] = {1, 2};' we don't know the size of the
5456 array until we finish parsing the initializer. If that's the
5457 situation we're in, update DECL accordingly. */
5460 maybe_deduce_size_from_array_init (tree decl
, tree init
)
5462 tree type
= TREE_TYPE (decl
);
5464 if (TREE_CODE (type
) == ARRAY_TYPE
5465 && TYPE_DOMAIN (type
) == NULL_TREE
5466 && TREE_CODE (decl
) != TYPE_DECL
)
5468 /* do_default is really a C-ism to deal with tentative definitions.
5469 But let's leave it here to ease the eventual merge. */
5470 int do_default
= !DECL_EXTERNAL (decl
);
5471 tree initializer
= init
? init
: DECL_INITIAL (decl
);
5474 /* Check that there are no designated initializers in INIT, as
5475 those are not supported in GNU C++, and as the middle-end
5476 will crash if presented with a non-numeric designated
5478 if (initializer
&& BRACE_ENCLOSED_INITIALIZER_P (initializer
))
5480 vec
<constructor_elt
, va_gc
> *v
= CONSTRUCTOR_ELTS (initializer
);
5481 constructor_elt
*ce
;
5483 FOR_EACH_VEC_SAFE_ELT (v
, i
, ce
)
5485 if (instantiation_dependent_expression_p (ce
->index
))
5487 if (!check_array_designated_initializer (ce
, i
))
5493 TREE_TYPE (decl
) = error_mark_node
;
5496 failure
= cp_complete_array_type (&TREE_TYPE (decl
), initializer
,
5500 error_at (cp_expr_loc_or_loc (initializer
,
5501 DECL_SOURCE_LOCATION (decl
)),
5502 "initializer fails to determine size of %qD", decl
);
5504 else if (failure
== 2)
5508 error_at (DECL_SOURCE_LOCATION (decl
),
5509 "array size missing in %qD", decl
);
5511 /* If a `static' var's size isn't known, make it extern as
5512 well as static, so it does not get allocated. If it's not
5513 `static', then don't mark it extern; finish_incomplete_decl
5514 will give it a default size and it will get allocated. */
5515 else if (!pedantic
&& TREE_STATIC (decl
) && !TREE_PUBLIC (decl
))
5516 DECL_EXTERNAL (decl
) = 1;
5518 else if (failure
== 3)
5520 error_at (DECL_SOURCE_LOCATION (decl
),
5521 "zero-size array %qD", decl
);
5525 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl
)), decl
);
5527 relayout_decl (decl
);
5531 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
5532 any appropriate error messages regarding the layout. */
5535 layout_var_decl (tree decl
)
5539 type
= TREE_TYPE (decl
);
5540 if (type
== error_mark_node
)
5543 /* If we haven't already laid out this declaration, do so now.
5544 Note that we must not call complete type for an external object
5545 because it's type might involve templates that we are not
5546 supposed to instantiate yet. (And it's perfectly valid to say
5547 `extern X x' for some incomplete type `X'.) */
5548 if (!DECL_EXTERNAL (decl
))
5549 complete_type (type
);
5550 if (!DECL_SIZE (decl
)
5551 && TREE_TYPE (decl
) != error_mark_node
5552 && complete_or_array_type_p (type
))
5553 layout_decl (decl
, 0);
5555 if (!DECL_EXTERNAL (decl
) && DECL_SIZE (decl
) == NULL_TREE
)
5557 /* An automatic variable with an incomplete type: that is an error.
5558 Don't talk about array types here, since we took care of that
5559 message in grokdeclarator. */
5560 error_at (DECL_SOURCE_LOCATION (decl
),
5561 "storage size of %qD isn%'t known", decl
);
5562 TREE_TYPE (decl
) = error_mark_node
;
5565 /* Keep this code around in case we later want to control debug info
5566 based on whether a type is "used". (jason 1999-11-11) */
5568 else if (!DECL_EXTERNAL (decl
) && MAYBE_CLASS_TYPE_P (ttype
))
5569 /* Let debugger know it should output info for this type. */
5570 note_debug_info_needed (ttype
);
5572 if (TREE_STATIC (decl
) && DECL_CLASS_SCOPE_P (decl
))
5573 note_debug_info_needed (DECL_CONTEXT (decl
));
5576 if ((DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
5577 && DECL_SIZE (decl
) != NULL_TREE
5578 && ! TREE_CONSTANT (DECL_SIZE (decl
)))
5580 if (TREE_CODE (DECL_SIZE (decl
)) == INTEGER_CST
)
5581 constant_expression_warning (DECL_SIZE (decl
));
5584 error_at (DECL_SOURCE_LOCATION (decl
),
5585 "storage size of %qD isn%'t constant", decl
);
5586 TREE_TYPE (decl
) = error_mark_node
;
5591 /* If a local static variable is declared in an inline function, or if
5592 we have a weak definition, we must endeavor to create only one
5593 instance of the variable at link-time. */
5596 maybe_commonize_var (tree decl
)
5598 /* Don't mess with __FUNCTION__ and similar. */
5599 if (DECL_ARTIFICIAL (decl
))
5602 /* Static data in a function with comdat linkage also has comdat
5604 if ((TREE_STATIC (decl
)
5605 && DECL_FUNCTION_SCOPE_P (decl
)
5606 && vague_linkage_p (DECL_CONTEXT (decl
)))
5607 || (TREE_PUBLIC (decl
) && DECL_INLINE_VAR_P (decl
)))
5611 /* With weak symbols, we simply make the variable COMDAT;
5612 that will cause copies in multiple translations units to
5614 comdat_linkage (decl
);
5618 if (DECL_INITIAL (decl
) == NULL_TREE
5619 || DECL_INITIAL (decl
) == error_mark_node
)
5621 /* Without weak symbols, we can use COMMON to merge
5622 uninitialized variables. */
5623 TREE_PUBLIC (decl
) = 1;
5624 DECL_COMMON (decl
) = 1;
5628 /* While for initialized variables, we must use internal
5629 linkage -- which means that multiple copies will not
5631 TREE_PUBLIC (decl
) = 0;
5632 DECL_COMMON (decl
) = 0;
5634 if (DECL_INLINE_VAR_P (decl
))
5635 msg
= G_("sorry: semantics of inline variable "
5636 "%q#D are wrong (you%'ll wind up with "
5637 "multiple copies)");
5639 msg
= G_("sorry: semantics of inline function "
5640 "static data %q#D are wrong (you%'ll wind "
5641 "up with multiple copies)");
5642 if (warning_at (DECL_SOURCE_LOCATION (decl
), 0,
5644 inform (DECL_SOURCE_LOCATION (decl
),
5645 "you can work around this by removing the initializer");
5651 /* Issue an error message if DECL is an uninitialized const variable.
5652 CONSTEXPR_CONTEXT_P is true when the function is called in a constexpr
5653 context from potential_constant_expression. Returns true if all is well,
5657 check_for_uninitialized_const_var (tree decl
, bool constexpr_context_p
,
5658 tsubst_flags_t complain
)
5660 tree type
= strip_array_types (TREE_TYPE (decl
));
5662 /* ``Unless explicitly declared extern, a const object does not have
5663 external linkage and must be initialized. ($8.4; $12.1)'' ARM
5666 && !TYPE_REF_P (type
)
5667 && (constexpr_context_p
5668 || CP_TYPE_CONST_P (type
) || var_in_constexpr_fn (decl
))
5669 && !DECL_NONTRIVIALLY_INITIALIZED_P (decl
))
5671 tree field
= default_init_uninitialized_part (type
);
5675 if (!constexpr_context_p
)
5677 if (CP_TYPE_CONST_P (type
))
5679 if (complain
& tf_error
)
5680 permerror (DECL_SOURCE_LOCATION (decl
),
5681 "uninitialized const %qD", decl
);
5685 if (!is_instantiation_of_constexpr (current_function_decl
)
5686 && (complain
& tf_error
))
5687 error_at (DECL_SOURCE_LOCATION (decl
),
5688 "uninitialized variable %qD in %<constexpr%> "
5690 cp_function_chain
->invalid_constexpr
= true;
5693 else if (complain
& tf_error
)
5694 error_at (DECL_SOURCE_LOCATION (decl
),
5695 "uninitialized variable %qD in %<constexpr%> context",
5698 if (CLASS_TYPE_P (type
) && (complain
& tf_error
))
5700 tree defaulted_ctor
;
5702 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (type
)),
5703 "%q#T has no user-provided default constructor", type
);
5704 defaulted_ctor
= in_class_defaulted_default_constructor (type
);
5706 inform (DECL_SOURCE_LOCATION (defaulted_ctor
),
5707 "constructor is not user-provided because it is "
5708 "explicitly defaulted in the class body");
5709 inform (DECL_SOURCE_LOCATION (field
),
5710 "and the implicitly-defined constructor does not "
5711 "initialize %q#D", field
);
5720 /* Structure holding the current initializer being processed by reshape_init.
5721 CUR is a pointer to the current element being processed, END is a pointer
5722 after the last element present in the initializer. */
5725 constructor_elt
*cur
;
5726 constructor_elt
*end
;
5729 static tree
reshape_init_r (tree
, reshape_iter
*, bool, tsubst_flags_t
);
5731 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
5732 returned is the next FIELD_DECL (possibly FIELD itself) that can be
5733 initialized. If there are no more such fields, the return value
5737 next_initializable_field (tree field
)
5740 && (TREE_CODE (field
) != FIELD_DECL
5741 || DECL_UNNAMED_BIT_FIELD (field
)
5742 || (DECL_ARTIFICIAL (field
)
5743 && !(cxx_dialect
>= cxx17
&& DECL_FIELD_IS_BASE (field
)))))
5744 field
= DECL_CHAIN (field
);
5749 /* Return true for [dcl.init.list] direct-list-initialization from
5750 single element of enumeration with a fixed underlying type. */
5753 is_direct_enum_init (tree type
, tree init
)
5755 if (cxx_dialect
>= cxx17
5756 && TREE_CODE (type
) == ENUMERAL_TYPE
5757 && ENUM_FIXED_UNDERLYING_TYPE_P (type
)
5758 && TREE_CODE (init
) == CONSTRUCTOR
5759 && CONSTRUCTOR_IS_DIRECT_INIT (init
)
5760 && CONSTRUCTOR_NELTS (init
) == 1)
5765 /* Subroutine of reshape_init_array and reshape_init_vector, which does
5766 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
5767 INTEGER_CST representing the size of the array minus one (the maximum index),
5768 or NULL_TREE if the array was declared without specifying the size. D is
5769 the iterator within the constructor. */
5772 reshape_init_array_1 (tree elt_type
, tree max_index
, reshape_iter
*d
,
5773 tsubst_flags_t complain
)
5776 bool sized_array_p
= (max_index
&& TREE_CONSTANT (max_index
));
5777 unsigned HOST_WIDE_INT max_index_cst
= 0;
5778 unsigned HOST_WIDE_INT index
;
5780 /* The initializer for an array is always a CONSTRUCTOR. */
5781 new_init
= build_constructor (init_list_type_node
, NULL
);
5785 /* Minus 1 is used for zero sized arrays. */
5786 if (integer_all_onesp (max_index
))
5789 if (tree_fits_uhwi_p (max_index
))
5790 max_index_cst
= tree_to_uhwi (max_index
);
5791 /* sizetype is sign extended, not zero extended. */
5793 max_index_cst
= tree_to_uhwi (fold_convert (size_type_node
, max_index
));
5796 /* Loop until there are no more initializers. */
5798 d
->cur
!= d
->end
&& (!sized_array_p
|| index
<= max_index_cst
);
5802 constructor_elt
*old_cur
= d
->cur
;
5804 check_array_designated_initializer (d
->cur
, index
);
5805 elt_init
= reshape_init_r (elt_type
, d
, /*first_initializer_p=*/false,
5807 if (elt_init
== error_mark_node
)
5808 return error_mark_node
;
5809 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init
),
5810 size_int (index
), elt_init
);
5811 if (!TREE_CONSTANT (elt_init
))
5812 TREE_CONSTANT (new_init
) = false;
5814 /* This can happen with an invalid initializer (c++/54501). */
5815 if (d
->cur
== old_cur
&& !sized_array_p
)
5822 /* Subroutine of reshape_init_r, processes the initializers for arrays.
5823 Parameters are the same of reshape_init_r. */
5826 reshape_init_array (tree type
, reshape_iter
*d
, tsubst_flags_t complain
)
5828 tree max_index
= NULL_TREE
;
5830 gcc_assert (TREE_CODE (type
) == ARRAY_TYPE
);
5832 if (TYPE_DOMAIN (type
))
5833 max_index
= array_type_nelts (type
);
5835 return reshape_init_array_1 (TREE_TYPE (type
), max_index
, d
, complain
);
5838 /* Subroutine of reshape_init_r, processes the initializers for vectors.
5839 Parameters are the same of reshape_init_r. */
5842 reshape_init_vector (tree type
, reshape_iter
*d
, tsubst_flags_t complain
)
5844 tree max_index
= NULL_TREE
;
5846 gcc_assert (VECTOR_TYPE_P (type
));
5848 if (COMPOUND_LITERAL_P (d
->cur
->value
))
5850 tree value
= d
->cur
->value
;
5851 if (!same_type_p (TREE_TYPE (value
), type
))
5853 if (complain
& tf_error
)
5854 error ("invalid type %qT as initializer for a vector of type %qT",
5855 TREE_TYPE (d
->cur
->value
), type
);
5856 value
= error_mark_node
;
5862 /* For a vector, we initialize it as an array of the appropriate size. */
5863 if (VECTOR_TYPE_P (type
))
5864 max_index
= size_int (TYPE_VECTOR_SUBPARTS (type
) - 1);
5866 return reshape_init_array_1 (TREE_TYPE (type
), max_index
, d
, complain
);
5869 /* Subroutine of reshape_init_r, processes the initializers for classes
5870 or union. Parameters are the same of reshape_init_r. */
5873 reshape_init_class (tree type
, reshape_iter
*d
, bool first_initializer_p
,
5874 tsubst_flags_t complain
)
5879 gcc_assert (CLASS_TYPE_P (type
));
5881 /* The initializer for a class is always a CONSTRUCTOR. */
5882 new_init
= build_constructor (init_list_type_node
, NULL
);
5883 field
= next_initializable_field (TYPE_FIELDS (type
));
5889 An initializer for an aggregate member that is an
5890 empty class shall have the form of an empty
5891 initializer-list {}. */
5892 if (!first_initializer_p
)
5894 if (complain
& tf_error
)
5895 error ("initializer for %qT must be brace-enclosed", type
);
5896 return error_mark_node
;
5901 /* Loop through the initializable fields, gathering initializers. */
5902 while (d
->cur
!= d
->end
)
5905 constructor_elt
*old_cur
= d
->cur
;
5907 /* Handle designated initializers, as an extension. */
5910 if (d
->cur
->index
== error_mark_node
)
5911 return error_mark_node
;
5913 if (TREE_CODE (d
->cur
->index
) == FIELD_DECL
)
5915 /* We already reshaped this. */
5916 if (field
!= d
->cur
->index
)
5918 tree id
= DECL_NAME (d
->cur
->index
);
5920 gcc_checking_assert (d
->cur
->index
5921 == get_class_binding (type
, id
, false));
5922 field
= d
->cur
->index
;
5925 else if (TREE_CODE (d
->cur
->index
) == IDENTIFIER_NODE
)
5926 field
= get_class_binding (type
, d
->cur
->index
, false);
5929 if (complain
& tf_error
)
5930 error ("%<[%E] =%> used in a GNU-style designated initializer"
5931 " for class %qT", d
->cur
->index
, type
);
5932 return error_mark_node
;
5935 if (!field
|| TREE_CODE (field
) != FIELD_DECL
)
5937 if (complain
& tf_error
)
5938 error ("%qT has no non-static data member named %qD", type
,
5940 return error_mark_node
;
5944 /* If we processed all the member of the class, we are done. */
5948 field_init
= reshape_init_r (TREE_TYPE (field
), d
,
5949 /*first_initializer_p=*/false, complain
);
5950 if (field_init
== error_mark_node
)
5951 return error_mark_node
;
5953 if (d
->cur
== old_cur
&& d
->cur
->index
)
5955 /* This can happen with an invalid initializer for a flexible
5956 array member (c++/54441). */
5957 if (complain
& tf_error
)
5958 error ("invalid initializer for %q#D", field
);
5959 return error_mark_node
;
5962 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init
), field
, field_init
);
5966 When a union is initialized with a brace-enclosed
5967 initializer, the braces shall only contain an
5968 initializer for the first member of the union. */
5969 if (TREE_CODE (type
) == UNION_TYPE
)
5972 field
= next_initializable_field (DECL_CHAIN (field
));
5978 /* Subroutine of reshape_init_r. We're in a context where C99 initializer
5979 designators are not valid; either complain or return true to indicate
5980 that reshape_init_r should return error_mark_node. */
5983 has_designator_problem (reshape_iter
*d
, tsubst_flags_t complain
)
5987 if (complain
& tf_error
)
5988 error ("C99 designator %qE outside aggregate initializer",
5996 /* Subroutine of reshape_init, which processes a single initializer (part of
5997 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
5998 iterator within the CONSTRUCTOR which points to the initializer to process.
5999 FIRST_INITIALIZER_P is true if this is the first initializer of the
6000 outermost CONSTRUCTOR node. */
6003 reshape_init_r (tree type
, reshape_iter
*d
, bool first_initializer_p
,
6004 tsubst_flags_t complain
)
6006 tree init
= d
->cur
->value
;
6008 if (error_operand_p (init
))
6009 return error_mark_node
;
6011 if (first_initializer_p
&& !CP_AGGREGATE_TYPE_P (type
)
6012 && has_designator_problem (d
, complain
))
6013 return error_mark_node
;
6015 if (TREE_CODE (type
) == COMPLEX_TYPE
)
6017 /* A complex type can be initialized from one or two initializers,
6018 but braces are not elided. */
6020 if (BRACE_ENCLOSED_INITIALIZER_P (init
))
6022 if (CONSTRUCTOR_NELTS (init
) > 2)
6024 if (complain
& tf_error
)
6025 error ("too many initializers for %qT", type
);
6027 return error_mark_node
;
6030 else if (first_initializer_p
&& d
->cur
!= d
->end
)
6032 vec
<constructor_elt
, va_gc
> *v
= 0;
6033 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, init
);
6034 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, d
->cur
->value
);
6035 if (has_designator_problem (d
, complain
))
6036 return error_mark_node
;
6038 init
= build_constructor (init_list_type_node
, v
);
6043 /* A non-aggregate type is always initialized with a single
6045 if (!CP_AGGREGATE_TYPE_P (type
))
6047 /* It is invalid to initialize a non-aggregate type with a
6048 brace-enclosed initializer before C++0x.
6049 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
6050 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
6051 a CONSTRUCTOR (with a record type). */
6052 if (TREE_CODE (init
) == CONSTRUCTOR
6053 /* Don't complain about a capture-init. */
6054 && !CONSTRUCTOR_IS_DIRECT_INIT (init
)
6055 && BRACE_ENCLOSED_INITIALIZER_P (init
)) /* p7626.C */
6057 if (SCALAR_TYPE_P (type
))
6059 if (cxx_dialect
< cxx11
6060 /* Isn't value-initialization. */
6061 || CONSTRUCTOR_NELTS (init
) > 0)
6063 if (complain
& tf_error
)
6064 error ("braces around scalar initializer for type %qT",
6066 init
= error_mark_node
;
6070 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS
);
6077 /* "If T is a class type and the initializer list has a single element of
6078 type cv U, where U is T or a class derived from T, the object is
6079 initialized from that element." Even if T is an aggregate. */
6080 if (cxx_dialect
>= cxx11
&& (CLASS_TYPE_P (type
) || VECTOR_TYPE_P (type
))
6081 && first_initializer_p
6082 && d
->end
- d
->cur
== 1
6083 && reference_related_p (type
, TREE_TYPE (init
)))
6091 All implicit type conversions (clause _conv_) are considered when
6092 initializing the aggregate member with an initializer from an
6093 initializer-list. If the initializer can initialize a member,
6094 the member is initialized. Otherwise, if the member is itself a
6095 non-empty subaggregate, brace elision is assumed and the
6096 initializer is considered for the initialization of the first
6097 member of the subaggregate. */
6098 if (TREE_CODE (init
) != CONSTRUCTOR
6099 /* But don't try this for the first initializer, since that would be
6100 looking through the outermost braces; A a2 = { a1 }; is not a
6101 valid aggregate initialization. */
6102 && !first_initializer_p
6103 && (same_type_ignoring_top_level_qualifiers_p (type
, TREE_TYPE (init
))
6104 || can_convert_arg (type
, TREE_TYPE (init
), init
, LOOKUP_NORMAL
,
6111 /* [dcl.init.string]
6113 A char array (whether plain char, signed char, or unsigned char)
6114 can be initialized by a string-literal (optionally enclosed in
6115 braces); a wchar_t array can be initialized by a wide
6116 string-literal (optionally enclosed in braces). */
6117 if (TREE_CODE (type
) == ARRAY_TYPE
6118 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type
))))
6120 tree str_init
= init
;
6122 /* Strip one level of braces if and only if they enclose a single
6123 element (as allowed by [dcl.init.string]). */
6124 if (!first_initializer_p
6125 && TREE_CODE (str_init
) == CONSTRUCTOR
6126 && CONSTRUCTOR_NELTS (str_init
) == 1)
6128 str_init
= (*CONSTRUCTOR_ELTS (str_init
))[0].value
;
6131 /* If it's a string literal, then it's the initializer for the array
6132 as a whole. Otherwise, continue with normal initialization for
6133 array types (one value per array element). */
6134 if (TREE_CODE (str_init
) == STRING_CST
)
6136 if (has_designator_problem (d
, complain
))
6137 return error_mark_node
;
6143 /* The following cases are about aggregates. If we are not within a full
6144 initializer already, and there is not a CONSTRUCTOR, it means that there
6145 is a missing set of braces (that is, we are processing the case for
6146 which reshape_init exists). */
6147 if (!first_initializer_p
)
6149 if (TREE_CODE (init
) == CONSTRUCTOR
)
6151 if (TREE_TYPE (init
) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init
)))
6152 /* There is no need to reshape pointer-to-member function
6153 initializers, as they are always constructed correctly
6154 by the front end. */
6156 else if (COMPOUND_LITERAL_P (init
))
6157 /* For a nested compound literal, there is no need to reshape since
6158 brace elision is not allowed. Even if we decided to allow it,
6159 we should add a call to reshape_init in finish_compound_literal,
6160 before calling digest_init, so changing this code would still
6161 not be necessary. */
6162 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init
));
6166 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init
));
6167 return reshape_init (type
, init
, complain
);
6171 if (complain
& tf_warning
)
6172 warning (OPT_Wmissing_braces
,
6173 "missing braces around initializer for %qT",
6177 /* Dispatch to specialized routines. */
6178 if (CLASS_TYPE_P (type
))
6179 return reshape_init_class (type
, d
, first_initializer_p
, complain
);
6180 else if (TREE_CODE (type
) == ARRAY_TYPE
)
6181 return reshape_init_array (type
, d
, complain
);
6182 else if (VECTOR_TYPE_P (type
))
6183 return reshape_init_vector (type
, d
, complain
);
6188 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
6189 brace-enclosed aggregate initializer.
6191 INIT is the CONSTRUCTOR containing the list of initializers describing
6192 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
6193 It may not presently match the shape of the TYPE; for example:
6195 struct S { int a; int b; };
6196 struct S a[] = { 1, 2, 3, 4 };
6198 Here INIT will hold a vector of four elements, rather than a
6199 vector of two elements, each itself a vector of two elements. This
6200 routine transforms INIT from the former form into the latter. The
6201 revised CONSTRUCTOR node is returned. */
6204 reshape_init (tree type
, tree init
, tsubst_flags_t complain
)
6206 vec
<constructor_elt
, va_gc
> *v
;
6210 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init
));
6212 v
= CONSTRUCTOR_ELTS (init
);
6214 /* An empty constructor does not need reshaping, and it is always a valid
6216 if (vec_safe_is_empty (v
))
6219 /* Handle [dcl.init.list] direct-list-initialization from
6220 single element of enumeration with a fixed underlying type. */
6221 if (is_direct_enum_init (type
, init
))
6223 tree elt
= CONSTRUCTOR_ELT (init
, 0)->value
;
6224 type
= cv_unqualified (type
);
6225 if (check_narrowing (ENUM_UNDERLYING_TYPE (type
), elt
, complain
))
6227 warning_sentinel
w (warn_useless_cast
);
6228 warning_sentinel
w2 (warn_ignored_qualifiers
);
6229 return cp_build_c_cast (type
, elt
, tf_warning_or_error
);
6232 return error_mark_node
;
6235 /* Recurse on this CONSTRUCTOR. */
6237 d
.end
= d
.cur
+ v
->length ();
6239 new_init
= reshape_init_r (type
, &d
, true, complain
);
6240 if (new_init
== error_mark_node
)
6241 return error_mark_node
;
6243 /* Make sure all the element of the constructor were used. Otherwise,
6244 issue an error about exceeding initializers. */
6247 if (complain
& tf_error
)
6248 error ("too many initializers for %qT", type
);
6249 return error_mark_node
;
6252 if (CONSTRUCTOR_IS_DIRECT_INIT (init
)
6253 && BRACE_ENCLOSED_INITIALIZER_P (new_init
))
6254 CONSTRUCTOR_IS_DIRECT_INIT (new_init
) = true;
6259 /* Verify array initializer. Returns true if errors have been reported. */
6262 check_array_initializer (tree decl
, tree type
, tree init
)
6264 tree element_type
= TREE_TYPE (type
);
6266 /* The array type itself need not be complete, because the
6267 initializer may tell us how many elements are in the array.
6268 But, the elements of the array must be complete. */
6269 if (!COMPLETE_TYPE_P (complete_type (element_type
)))
6272 error_at (DECL_SOURCE_LOCATION (decl
),
6273 "elements of array %q#D have incomplete type", decl
);
6275 error ("elements of array %q#T have incomplete type", type
);
6278 /* A compound literal can't have variable size. */
6280 && ((COMPLETE_TYPE_P (type
) && !TREE_CONSTANT (TYPE_SIZE (type
)))
6281 || !TREE_CONSTANT (TYPE_SIZE (element_type
))))
6283 error ("variable-sized compound literal");
6289 /* Subroutine of check_initializer; args are passed down from that function.
6290 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
6293 build_aggr_init_full_exprs (tree decl
, tree init
, int flags
)
6296 gcc_assert (stmts_are_full_exprs_p ());
6297 return build_aggr_init (decl
, init
, flags
, tf_warning_or_error
);
6300 /* Verify INIT (the initializer for DECL), and record the
6301 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
6302 grok_reference_init.
6304 If the return value is non-NULL, it is an expression that must be
6305 evaluated dynamically to initialize DECL. */
6308 check_initializer (tree decl
, tree init
, int flags
, vec
<tree
, va_gc
> **cleanups
)
6310 tree type
= TREE_TYPE (decl
);
6311 tree init_code
= NULL
;
6314 /* Things that are going to be initialized need to have complete
6316 TREE_TYPE (decl
) = type
= complete_type (TREE_TYPE (decl
));
6318 if (DECL_HAS_VALUE_EXPR_P (decl
))
6320 /* A variable with DECL_HAS_VALUE_EXPR_P set is just a placeholder,
6321 it doesn't have storage to be initialized. */
6322 gcc_assert (init
== NULL_TREE
);
6326 if (type
== error_mark_node
)
6327 /* We will have already complained. */
6330 if (TREE_CODE (type
) == ARRAY_TYPE
)
6332 if (check_array_initializer (decl
, type
, init
))
6335 else if (!COMPLETE_TYPE_P (type
))
6337 error_at (DECL_SOURCE_LOCATION (decl
),
6338 "%q#D has incomplete type", decl
);
6339 TREE_TYPE (decl
) = error_mark_node
;
6343 /* There is no way to make a variable-sized class type in GNU C++. */
6344 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type
)));
6346 if (init
&& BRACE_ENCLOSED_INITIALIZER_P (init
))
6348 int init_len
= CONSTRUCTOR_NELTS (init
);
6349 if (SCALAR_TYPE_P (type
))
6353 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS
);
6354 init
= build_zero_init (type
, NULL_TREE
, false);
6356 else if (init_len
!= 1 && TREE_CODE (type
) != COMPLEX_TYPE
)
6358 error_at (cp_expr_loc_or_loc (init
, DECL_SOURCE_LOCATION (decl
)),
6359 "scalar object %qD requires one element in "
6360 "initializer", decl
);
6361 TREE_TYPE (decl
) = error_mark_node
;
6367 if (TREE_CODE (decl
) == CONST_DECL
)
6369 gcc_assert (!TYPE_REF_P (type
));
6371 DECL_INITIAL (decl
) = init
;
6373 gcc_assert (init
!= NULL_TREE
);
6376 else if (!init
&& DECL_REALLY_EXTERN (decl
))
6378 else if (init
|| type_build_ctor_call (type
)
6379 || TYPE_REF_P (type
))
6381 if (TYPE_REF_P (type
))
6383 init
= grok_reference_init (decl
, type
, init
, flags
);
6384 flags
|= LOOKUP_ALREADY_DIGESTED
;
6387 check_for_uninitialized_const_var (decl
, /*constexpr_context_p=*/false,
6388 tf_warning_or_error
);
6389 /* Do not reshape constructors of vectors (they don't need to be
6391 else if (BRACE_ENCLOSED_INITIALIZER_P (init
))
6393 if (is_std_init_list (type
))
6395 init
= perform_implicit_conversion (type
, init
,
6396 tf_warning_or_error
);
6397 flags
|= LOOKUP_ALREADY_DIGESTED
;
6399 else if (TYPE_NON_AGGREGATE_CLASS (type
))
6401 /* Don't reshape if the class has constructors. */
6402 if (cxx_dialect
== cxx98
)
6403 error_at (cp_expr_loc_or_loc (init
, DECL_SOURCE_LOCATION (decl
)),
6404 "in C++98 %qD must be initialized by "
6405 "constructor, not by %<{...}%>",
6408 else if (VECTOR_TYPE_P (type
) && TYPE_VECTOR_OPAQUE (type
))
6410 error ("opaque vector types cannot be initialized");
6411 init
= error_mark_node
;
6415 init
= reshape_init (type
, init
, tf_warning_or_error
);
6416 flags
|= LOOKUP_NO_NARROWING
;
6419 else if (TREE_CODE (init
) == TREE_LIST
6420 && TREE_TYPE (init
) != unknown_type_node
6421 && !MAYBE_CLASS_TYPE_P (type
))
6423 gcc_assert (TREE_CODE (decl
) != RESULT_DECL
);
6425 /* We get here with code like `int a (2);' */
6426 init
= build_x_compound_expr_from_list (init
, ELK_INIT
,
6427 tf_warning_or_error
);
6430 /* If DECL has an array type without a specific bound, deduce the
6431 array size from the initializer. */
6432 maybe_deduce_size_from_array_init (decl
, init
);
6433 type
= TREE_TYPE (decl
);
6434 if (type
== error_mark_node
)
6437 if (((type_build_ctor_call (type
) || CLASS_TYPE_P (type
))
6438 && !(flags
& LOOKUP_ALREADY_DIGESTED
)
6439 && !(init
&& BRACE_ENCLOSED_INITIALIZER_P (init
)
6440 && CP_AGGREGATE_TYPE_P (type
)
6441 && (CLASS_TYPE_P (type
)
6442 || !TYPE_NEEDS_CONSTRUCTING (type
)
6443 || type_has_extended_temps (type
))))
6444 || (DECL_DECOMPOSITION_P (decl
) && TREE_CODE (type
) == ARRAY_TYPE
))
6446 init_code
= build_aggr_init_full_exprs (decl
, init
, flags
);
6448 /* A constructor call is a non-trivial initializer even if
6449 it isn't explicitly written. */
6450 if (TREE_SIDE_EFFECTS (init_code
))
6451 DECL_NONTRIVIALLY_INITIALIZED_P (decl
) = true;
6453 /* If this is a constexpr initializer, expand_default_init will
6454 have returned an INIT_EXPR rather than a CALL_EXPR. In that
6455 case, pull the initializer back out and pass it down into
6456 store_init_value. */
6457 while (TREE_CODE (init_code
) == EXPR_STMT
6458 || TREE_CODE (init_code
) == CONVERT_EXPR
)
6459 init_code
= TREE_OPERAND (init_code
, 0);
6460 if (TREE_CODE (init_code
) == INIT_EXPR
)
6462 init
= TREE_OPERAND (init_code
, 1);
6463 init_code
= NULL_TREE
;
6464 /* Don't call digest_init; it's unnecessary and will complain
6465 about aggregate initialization of non-aggregate classes. */
6466 flags
|= LOOKUP_ALREADY_DIGESTED
;
6468 else if (DECL_DECLARED_CONSTEXPR_P (decl
))
6470 /* Declared constexpr, but no suitable initializer; massage
6471 init appropriately so we can pass it into store_init_value
6473 if (CLASS_TYPE_P (type
)
6474 && (!init
|| TREE_CODE (init
) == TREE_LIST
))
6476 init
= build_functional_cast (type
, init
, tf_none
);
6477 if (TREE_CODE (init
) == TARGET_EXPR
)
6478 TARGET_EXPR_DIRECT_INIT_P (init
) = true;
6480 init_code
= NULL_TREE
;
6486 if (init
&& TREE_CODE (init
) != TREE_VEC
)
6488 /* In aggregate initialization of a variable, each element
6489 initialization is a full-expression because there is no
6490 enclosing expression. */
6491 gcc_assert (stmts_are_full_exprs_p ());
6493 init_code
= store_init_value (decl
, init
, cleanups
, flags
);
6495 if (DECL_INITIAL (decl
)
6496 && TREE_CODE (DECL_INITIAL (decl
)) == CONSTRUCTOR
6497 && !vec_safe_is_empty (CONSTRUCTOR_ELTS (DECL_INITIAL (decl
))))
6499 tree elt
= CONSTRUCTOR_ELTS (DECL_INITIAL (decl
))->last ().value
;
6500 if (TREE_CODE (TREE_TYPE (elt
)) == ARRAY_TYPE
6501 && TYPE_SIZE (TREE_TYPE (elt
)) == NULL_TREE
)
6502 cp_complete_array_type (&TREE_TYPE (elt
), elt
, false);
6505 if (pedantic
&& TREE_CODE (type
) == ARRAY_TYPE
6506 && DECL_INITIAL (decl
)
6507 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
6508 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl
)))
6509 warning_at (cp_expr_loc_or_loc (DECL_INITIAL (decl
),
6510 DECL_SOURCE_LOCATION (decl
)),
6511 0, "array %qD initialized by parenthesized "
6512 "string literal %qE",
6513 decl
, DECL_INITIAL (decl
));
6519 if (CLASS_TYPE_P (core_type
= strip_array_types (type
))
6520 && (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type
)
6521 || CLASSTYPE_REF_FIELDS_NEED_INIT (core_type
)))
6522 diagnose_uninitialized_cst_or_ref_member (core_type
, /*using_new=*/false,
6525 check_for_uninitialized_const_var (decl
, /*constexpr_context_p=*/false,
6526 tf_warning_or_error
);
6529 if (init
&& init
!= error_mark_node
)
6530 init_code
= build2 (INIT_EXPR
, type
, decl
, init
);
6534 /* We might have set these in cp_finish_decl. */
6535 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
) = false;
6536 TREE_CONSTANT (decl
) = false;
6540 && (DECL_IN_AGGR_P (decl
)
6541 && DECL_INITIALIZED_IN_CLASS_P (decl
)
6542 && !DECL_VAR_DECLARED_INLINE_P (decl
)))
6544 static int explained
= 0;
6546 if (cxx_dialect
< cxx11
)
6547 error ("initializer invalid for static member with constructor");
6548 else if (cxx_dialect
< cxx17
)
6549 error ("non-constant in-class initialization invalid for static "
6550 "member %qD", decl
);
6552 error ("non-constant in-class initialization invalid for non-inline "
6553 "static member %qD", decl
);
6556 inform (input_location
,
6557 "(an out of class initialization is required)");
6566 /* If DECL is not a local variable, give it RTL. */
6569 make_rtl_for_nonlocal_decl (tree decl
, tree init
, const char* asmspec
)
6571 int toplev
= toplevel_bindings_p ();
6574 /* Set the DECL_ASSEMBLER_NAME for the object. */
6577 /* The `register' keyword, when used together with an
6578 asm-specification, indicates that the variable should be
6579 placed in a particular register. */
6580 if (VAR_P (decl
) && DECL_REGISTER (decl
))
6582 set_user_assembler_name (decl
, asmspec
);
6583 DECL_HARD_REGISTER (decl
) = 1;
6587 if (TREE_CODE (decl
) == FUNCTION_DECL
6588 && fndecl_built_in_p (decl
, BUILT_IN_NORMAL
))
6589 set_builtin_user_assembler_name (decl
, asmspec
);
6590 set_user_assembler_name (decl
, asmspec
);
6594 /* Handle non-variables up front. */
6597 rest_of_decl_compilation (decl
, toplev
, at_eof
);
6601 /* If we see a class member here, it should be a static data
6603 if (DECL_LANG_SPECIFIC (decl
) && DECL_IN_AGGR_P (decl
))
6605 gcc_assert (TREE_STATIC (decl
));
6606 /* An in-class declaration of a static data member should be
6607 external; it is only a declaration, and not a definition. */
6608 if (init
== NULL_TREE
)
6609 gcc_assert (DECL_EXTERNAL (decl
)
6610 || !TREE_PUBLIC (decl
)
6611 || DECL_INLINE_VAR_P (decl
));
6614 /* We don't create any RTL for local variables. */
6615 if (DECL_FUNCTION_SCOPE_P (decl
) && !TREE_STATIC (decl
))
6618 /* We defer emission of local statics until the corresponding
6619 DECL_EXPR is expanded. But with constexpr its function might never
6620 be expanded, so go ahead and tell cgraph about the variable now. */
6621 defer_p
= ((DECL_FUNCTION_SCOPE_P (decl
)
6622 && !var_in_maybe_constexpr_fn (decl
))
6623 || DECL_VIRTUAL_P (decl
));
6625 /* Defer template instantiations. */
6626 if (DECL_LANG_SPECIFIC (decl
)
6627 && DECL_IMPLICIT_INSTANTIATION (decl
))
6630 /* If we're not deferring, go ahead and assemble the variable. */
6632 rest_of_decl_compilation (decl
, toplev
, at_eof
);
6635 /* walk_tree helper for wrap_temporary_cleanups, below. */
6638 wrap_cleanups_r (tree
*stmt_p
, int *walk_subtrees
, void *data
)
6640 /* Stop at types or full-expression boundaries. */
6641 if (TYPE_P (*stmt_p
)
6642 || TREE_CODE (*stmt_p
) == CLEANUP_POINT_EXPR
)
6648 if (TREE_CODE (*stmt_p
) == TARGET_EXPR
)
6650 tree guard
= (tree
)data
;
6651 tree tcleanup
= TARGET_EXPR_CLEANUP (*stmt_p
);
6653 tcleanup
= build2 (TRY_CATCH_EXPR
, void_type_node
, tcleanup
, guard
);
6654 /* Tell honor_protect_cleanup_actions to handle this as a separate
6656 TRY_CATCH_IS_CLEANUP (tcleanup
) = 1;
6658 TARGET_EXPR_CLEANUP (*stmt_p
) = tcleanup
;
6664 /* We're initializing a local variable which has a cleanup GUARD. If there
6665 are any temporaries used in the initializer INIT of this variable, we
6666 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
6667 variable will be cleaned up properly if one of them throws.
6669 Unfortunately, there's no way to express this properly in terms of
6670 nesting, as the regions for the temporaries overlap the region for the
6671 variable itself; if there are two temporaries, the variable needs to be
6672 the first thing destroyed if either of them throws. However, we only
6673 want to run the variable's cleanup if it actually got constructed. So
6674 we need to guard the temporary cleanups with the variable's cleanup if
6675 they are run on the normal path, but not if they are run on the
6676 exceptional path. We implement this by telling
6677 honor_protect_cleanup_actions to strip the variable cleanup from the
6678 exceptional path. */
6681 wrap_temporary_cleanups (tree init
, tree guard
)
6683 cp_walk_tree_without_duplicates (&init
, wrap_cleanups_r
, (void *)guard
);
6686 /* Generate code to initialize DECL (a local variable). */
6689 initialize_local_var (tree decl
, tree init
)
6691 tree type
= TREE_TYPE (decl
);
6695 gcc_assert (VAR_P (decl
)
6696 || TREE_CODE (decl
) == RESULT_DECL
);
6697 gcc_assert (!TREE_STATIC (decl
));
6699 if (DECL_SIZE (decl
) == NULL_TREE
)
6701 /* If we used it already as memory, it must stay in memory. */
6702 DECL_INITIAL (decl
) = NULL_TREE
;
6703 TREE_ADDRESSABLE (decl
) = TREE_USED (decl
);
6707 if (type
== error_mark_node
)
6710 /* Compute and store the initial value. */
6711 already_used
= TREE_USED (decl
) || TREE_USED (type
);
6712 if (TREE_USED (type
))
6713 DECL_READ_P (decl
) = 1;
6715 /* Generate a cleanup, if necessary. */
6716 cleanup
= cxx_maybe_build_cleanup (decl
, tf_warning_or_error
);
6718 /* Perform the initialization. */
6721 tree rinit
= (TREE_CODE (init
) == INIT_EXPR
6722 ? TREE_OPERAND (init
, 1) : NULL_TREE
);
6723 if (rinit
&& !TREE_SIDE_EFFECTS (rinit
))
6725 /* Stick simple initializers in DECL_INITIAL so that
6726 -Wno-init-self works (c++/34772). */
6727 gcc_assert (TREE_OPERAND (init
, 0) == decl
);
6728 DECL_INITIAL (decl
) = rinit
;
6730 if (warn_init_self
&& TYPE_REF_P (type
))
6734 warning_at (DECL_SOURCE_LOCATION (decl
),
6736 "reference %qD is initialized with itself", decl
);
6741 int saved_stmts_are_full_exprs_p
;
6743 /* If we're only initializing a single object, guard the
6744 destructors of any temporaries used in its initializer with
6745 its destructor. This isn't right for arrays because each
6746 element initialization is a full-expression. */
6747 if (cleanup
&& TREE_CODE (type
) != ARRAY_TYPE
)
6748 wrap_temporary_cleanups (init
, cleanup
);
6750 gcc_assert (building_stmt_list_p ());
6751 saved_stmts_are_full_exprs_p
= stmts_are_full_exprs_p ();
6752 current_stmt_tree ()->stmts_are_full_exprs_p
= 1;
6753 finish_expr_stmt (init
);
6754 current_stmt_tree ()->stmts_are_full_exprs_p
=
6755 saved_stmts_are_full_exprs_p
;
6759 /* Set this to 0 so we can tell whether an aggregate which was
6760 initialized was ever used. Don't do this if it has a
6761 destructor, so we don't complain about the 'resource
6762 allocation is initialization' idiom. Now set
6763 attribute((unused)) on types so decls of that type will be
6764 marked used. (see TREE_USED, above.) */
6765 if (TYPE_NEEDS_CONSTRUCTING (type
)
6767 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type
)
6768 && DECL_NAME (decl
))
6769 TREE_USED (decl
) = 0;
6770 else if (already_used
)
6771 TREE_USED (decl
) = 1;
6774 finish_decl_cleanup (decl
, cleanup
);
6777 /* DECL is a VAR_DECL for a compiler-generated variable with static
6778 storage duration (like a virtual table) whose initializer is a
6779 compile-time constant. Initialize the variable and provide it to the
6783 initialize_artificial_var (tree decl
, vec
<constructor_elt
, va_gc
> *v
)
6786 gcc_assert (DECL_ARTIFICIAL (decl
));
6787 init
= build_constructor (TREE_TYPE (decl
), v
);
6788 gcc_assert (TREE_CODE (init
) == CONSTRUCTOR
);
6789 DECL_INITIAL (decl
) = init
;
6790 DECL_INITIALIZED_P (decl
) = 1;
6791 /* Mark the decl as constexpr so that we can access its content
6793 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
) = true;
6794 DECL_DECLARED_CONSTEXPR_P (decl
) = true;
6795 determine_visibility (decl
);
6796 layout_var_decl (decl
);
6797 maybe_commonize_var (decl
);
6798 make_rtl_for_nonlocal_decl (decl
, init
, /*asmspec=*/NULL
);
6801 /* INIT is the initializer for a variable, as represented by the
6802 parser. Returns true iff INIT is value-dependent. */
6805 value_dependent_init_p (tree init
)
6807 if (TREE_CODE (init
) == TREE_LIST
)
6808 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
6809 return any_value_dependent_elements_p (init
);
6810 else if (TREE_CODE (init
) == CONSTRUCTOR
)
6811 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
6813 if (dependent_type_p (TREE_TYPE (init
)))
6816 vec
<constructor_elt
, va_gc
> *elts
;
6820 elts
= CONSTRUCTOR_ELTS (init
);
6821 nelts
= vec_safe_length (elts
);
6822 for (i
= 0; i
< nelts
; ++i
)
6823 if (value_dependent_init_p ((*elts
)[i
].value
))
6827 /* It must be a simple expression, e.g., int i = 3; */
6828 return value_dependent_expression_p (init
);
6833 // Returns true if a DECL is VAR_DECL with the concept specifier.
6835 is_concept_var (tree decl
)
6837 return (VAR_P (decl
)
6838 // Not all variables have DECL_LANG_SPECIFIC.
6839 && DECL_LANG_SPECIFIC (decl
)
6840 && DECL_DECLARED_CONCEPT_P (decl
));
6843 /* A helper function to be called via walk_tree. If any label exists
6844 under *TP, it is (going to be) forced. Set has_forced_label_in_static. */
6847 notice_forced_label_r (tree
*tp
, int *walk_subtrees
, void *)
6851 if (TREE_CODE (*tp
) == LABEL_DECL
)
6852 cfun
->has_forced_label_in_static
= 1;
6856 /* Finish processing of a declaration;
6857 install its line number and initial value.
6858 If the length of an array type is not known before,
6859 it must be determined now, from the initial value, or it is an error.
6861 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
6862 true, then INIT is an integral constant expression.
6864 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
6865 if the (init) syntax was used. */
6868 cp_finish_decl (tree decl
, tree init
, bool init_const_expr_p
,
6869 tree asmspec_tree
, int flags
)
6872 vec
<tree
, va_gc
> *cleanups
= NULL
;
6873 const char *asmspec
= NULL
;
6874 int was_readonly
= 0;
6875 bool var_definition_p
= false;
6878 if (decl
== error_mark_node
)
6883 error ("assignment (not initialization) in declaration");
6887 gcc_assert (TREE_CODE (decl
) != RESULT_DECL
);
6888 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
6889 gcc_assert (TREE_CODE (decl
) != PARM_DECL
);
6891 type
= TREE_TYPE (decl
);
6892 if (type
== error_mark_node
)
6895 /* Warn about register storage specifiers except when in GNU global
6896 or local register variable extension. */
6897 if (VAR_P (decl
) && DECL_REGISTER (decl
) && asmspec_tree
== NULL_TREE
)
6899 if (cxx_dialect
>= cxx17
)
6900 pedwarn (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
6901 "ISO C++17 does not allow %<register%> storage "
6904 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
6905 "%<register%> storage class specifier used");
6908 /* If a name was specified, get the string. */
6909 if (at_namespace_scope_p ())
6910 asmspec_tree
= maybe_apply_renaming_pragma (decl
, asmspec_tree
);
6911 if (asmspec_tree
&& asmspec_tree
!= error_mark_node
)
6912 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
6914 if (current_class_type
6915 && CP_DECL_CONTEXT (decl
) == current_class_type
6916 && TYPE_BEING_DEFINED (current_class_type
)
6917 && !CLASSTYPE_TEMPLATE_INSTANTIATION (current_class_type
)
6918 && (DECL_INITIAL (decl
) || init
))
6919 DECL_INITIALIZED_IN_CLASS_P (decl
) = 1;
6921 /* Do auto deduction unless decl is a function or an uninstantiated
6922 template specialization. */
6923 if (TREE_CODE (decl
) != FUNCTION_DECL
6924 && !(init
== NULL_TREE
6925 && DECL_LANG_SPECIFIC (decl
)
6926 && DECL_TEMPLATE_INSTANTIATION (decl
)
6927 && !DECL_TEMPLATE_INSTANTIATED (decl
))
6928 && (auto_node
= type_uses_auto (type
)))
6931 if (init
== NULL_TREE
)
6932 gcc_assert (CLASS_PLACEHOLDER_TEMPLATE (auto_node
));
6936 if (TREE_CODE (d_init
) == TREE_LIST
6937 && !CLASS_PLACEHOLDER_TEMPLATE (auto_node
))
6938 d_init
= build_x_compound_expr_from_list (d_init
, ELK_INIT
,
6939 tf_warning_or_error
);
6940 d_init
= resolve_nondeduced_context (d_init
, tf_warning_or_error
);
6942 enum auto_deduction_context adc
= adc_variable_type
;
6943 if (VAR_P (decl
) && DECL_DECOMPOSITION_P (decl
))
6944 adc
= adc_decomp_type
;
6945 type
= TREE_TYPE (decl
) = do_auto_deduction (type
, d_init
, auto_node
,
6946 tf_warning_or_error
, adc
,
6948 if (type
== error_mark_node
)
6950 if (TREE_CODE (type
) == FUNCTION_TYPE
)
6952 error ("initializer for %<decltype(auto) %D%> has function type "
6953 "(did you forget the %<()%> ?)", decl
);
6954 TREE_TYPE (decl
) = error_mark_node
;
6957 cp_apply_type_quals_to_decl (cp_type_quals (type
), decl
);
6960 if (ensure_literal_type_for_constexpr_object (decl
) == error_mark_node
)
6962 DECL_DECLARED_CONSTEXPR_P (decl
) = 0;
6963 if (VAR_P (decl
) && DECL_CLASS_SCOPE_P (decl
))
6966 DECL_EXTERNAL (decl
) = 1;
6971 && DECL_CLASS_SCOPE_P (decl
)
6972 && DECL_INITIALIZED_IN_CLASS_P (decl
))
6973 check_static_variable_definition (decl
, type
);
6975 if (init
&& TREE_CODE (decl
) == FUNCTION_DECL
)
6978 if (init
== ridpointers
[(int)RID_DELETE
])
6980 /* FIXME check this is 1st decl. */
6981 DECL_DELETED_FN (decl
) = 1;
6982 DECL_DECLARED_INLINE_P (decl
) = 1;
6983 DECL_INITIAL (decl
) = error_mark_node
;
6984 FOR_EACH_CLONE (clone
, decl
)
6986 DECL_DELETED_FN (clone
) = 1;
6987 DECL_DECLARED_INLINE_P (clone
) = 1;
6988 DECL_INITIAL (clone
) = error_mark_node
;
6992 else if (init
== ridpointers
[(int)RID_DEFAULT
])
6994 if (defaultable_fn_check (decl
))
6995 DECL_DEFAULTED_FN (decl
) = 1;
6997 DECL_INITIAL (decl
) = NULL_TREE
;
7001 if (init
&& VAR_P (decl
))
7003 DECL_NONTRIVIALLY_INITIALIZED_P (decl
) = 1;
7004 /* If DECL is a reference, then we want to know whether init is a
7005 reference constant; init_const_expr_p as passed tells us whether
7006 it's an rvalue constant. */
7007 if (TYPE_REF_P (type
))
7008 init_const_expr_p
= potential_constant_expression (init
);
7009 if (init_const_expr_p
)
7011 /* Set these flags now for templates. We'll update the flags in
7012 store_init_value for instantiations. */
7013 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
) = 1;
7014 if (decl_maybe_constant_var_p (decl
)
7015 /* FIXME setting TREE_CONSTANT on refs breaks the back end. */
7016 && !TYPE_REF_P (type
))
7017 TREE_CONSTANT (decl
) = 1;
7021 if (processing_template_decl
)
7023 bool type_dependent_p
;
7025 /* Add this declaration to the statement-tree. */
7026 if (at_function_scope_p ())
7027 add_decl_expr (decl
);
7029 type_dependent_p
= dependent_type_p (type
);
7031 if (check_for_bare_parameter_packs (init
))
7034 DECL_INITIAL (decl
) = NULL_TREE
;
7037 /* Generally, initializers in templates are expanded when the
7038 template is instantiated. But, if DECL is a variable constant
7039 then it can be used in future constant expressions, so its value
7040 must be available. */
7042 bool dep_init
= false;
7044 if (!VAR_P (decl
) || type_dependent_p
)
7045 /* We can't do anything if the decl has dependent type. */;
7046 else if (!init
&& is_concept_var (decl
))
7048 error ("variable concept has no initializer");
7049 init
= boolean_true_node
;
7052 && init_const_expr_p
7053 && !TYPE_REF_P (type
)
7054 && decl_maybe_constant_var_p (decl
)
7055 && !(dep_init
= value_dependent_init_p (init
)))
7057 /* This variable seems to be a non-dependent constant, so process
7058 its initializer. If check_initializer returns non-null the
7059 initialization wasn't constant after all. */
7061 cleanups
= make_tree_vector ();
7062 init_code
= check_initializer (decl
, init
, flags
, &cleanups
);
7063 if (init_code
== NULL_TREE
)
7065 release_tree_vector (cleanups
);
7069 gcc_assert (!DECL_PRETTY_FUNCTION_P (decl
));
7070 /* Deduce array size even if the initializer is dependent. */
7071 maybe_deduce_size_from_array_init (decl
, init
);
7072 /* And complain about multiple initializers. */
7073 if (init
&& TREE_CODE (init
) == TREE_LIST
&& TREE_CHAIN (init
)
7074 && !MAYBE_CLASS_TYPE_P (type
))
7075 init
= build_x_compound_expr_from_list (init
, ELK_INIT
,
7076 tf_warning_or_error
);
7080 DECL_INITIAL (decl
) = init
;
7084 retrofit_lang_decl (decl
);
7085 SET_DECL_DEPENDENT_INIT_P (decl
, true);
7090 /* Just store non-static data member initializers for later. */
7091 if (init
&& TREE_CODE (decl
) == FIELD_DECL
)
7092 DECL_INITIAL (decl
) = init
;
7094 /* Take care of TYPE_DECLs up front. */
7095 if (TREE_CODE (decl
) == TYPE_DECL
)
7097 if (type
!= error_mark_node
7098 && MAYBE_CLASS_TYPE_P (type
) && DECL_NAME (decl
))
7100 if (TREE_TYPE (DECL_NAME (decl
)) && TREE_TYPE (decl
) != type
)
7101 warning (0, "shadowing previous type declaration of %q#D", decl
);
7102 set_identifier_type_value (DECL_NAME (decl
), decl
);
7105 /* If we have installed this as the canonical typedef for this
7106 type, and that type has not been defined yet, delay emitting
7107 the debug information for it, as we will emit it later. */
7108 if (TYPE_MAIN_DECL (TREE_TYPE (decl
)) == decl
7109 && !COMPLETE_TYPE_P (TREE_TYPE (decl
)))
7110 TYPE_DECL_SUPPRESS_DEBUG (decl
) = 1;
7112 rest_of_decl_compilation (decl
, DECL_FILE_SCOPE_P (decl
),
7117 /* A reference will be modified here, as it is initialized. */
7118 if (! DECL_EXTERNAL (decl
)
7119 && TREE_READONLY (decl
)
7120 && TYPE_REF_P (type
))
7123 TREE_READONLY (decl
) = 0;
7128 /* If this is a local variable that will need a mangled name,
7129 register it now. We must do this before processing the
7130 initializer for the variable, since the initialization might
7131 require a guard variable, and since the mangled name of the
7132 guard variable will depend on the mangled name of this
7134 if (DECL_FUNCTION_SCOPE_P (decl
)
7135 && TREE_STATIC (decl
)
7136 && !DECL_ARTIFICIAL (decl
))
7138 push_local_name (decl
);
7139 /* Normally has_forced_label_in_static is set during GIMPLE
7140 lowering, but [cd]tors are never actually compiled directly.
7141 We need to set this early so we can deal with the label
7142 address extension. */
7143 if ((DECL_CONSTRUCTOR_P (current_function_decl
)
7144 || DECL_DESTRUCTOR_P (current_function_decl
))
7147 walk_tree (&init
, notice_forced_label_r
, NULL
, NULL
);
7148 add_local_decl (cfun
, decl
);
7150 /* And make sure it's in the symbol table for
7151 c_parse_final_cleanups to find. */
7152 varpool_node::get_create (decl
);
7155 /* Convert the initializer to the type of DECL, if we have not
7156 already initialized DECL. */
7157 if (!DECL_INITIALIZED_P (decl
)
7158 /* If !DECL_EXTERNAL then DECL is being defined. In the
7159 case of a static data member initialized inside the
7160 class-specifier, there can be an initializer even if DECL
7161 is *not* defined. */
7162 && (!DECL_EXTERNAL (decl
) || init
))
7164 cleanups
= make_tree_vector ();
7165 init
= check_initializer (decl
, init
, flags
, &cleanups
);
7171 The memory occupied by any object of static storage
7172 duration is zero-initialized at program startup before
7173 any other initialization takes place.
7175 We cannot create an appropriate initializer until after
7176 the type of DECL is finalized. If DECL_INITIAL is set,
7177 then the DECL is statically initialized, and any
7178 necessary zero-initialization has already been performed. */
7179 if (TREE_STATIC (decl
) && !DECL_INITIAL (decl
))
7180 DECL_INITIAL (decl
) = build_zero_init (TREE_TYPE (decl
),
7181 /*nelts=*/NULL_TREE
,
7182 /*static_storage_p=*/true);
7183 /* Remember that the initialization for this variable has
7185 DECL_INITIALIZED_P (decl
) = 1;
7186 /* This declaration is the definition of this variable,
7187 unless we are initializing a static data member within
7188 the class specifier. */
7189 if (!DECL_EXTERNAL (decl
))
7190 var_definition_p
= true;
7192 /* If the variable has an array type, lay out the type, even if
7193 there is no initializer. It is valid to index through the
7194 array, and we must get TYPE_ALIGN set correctly on the array
7196 else if (TREE_CODE (type
) == ARRAY_TYPE
)
7199 if (TREE_STATIC (decl
)
7200 && !at_function_scope_p ()
7201 && current_function_decl
== NULL
)
7202 /* So decl is a global variable or a static member of a
7203 non local class. Record the types it uses
7204 so that we can decide later to emit debug info for them. */
7205 record_types_used_by_current_var_decl (decl
);
7208 /* Add this declaration to the statement-tree. This needs to happen
7209 after the call to check_initializer so that the DECL_EXPR for a
7210 reference temp is added before the DECL_EXPR for the reference itself. */
7211 if (DECL_FUNCTION_SCOPE_P (decl
))
7213 /* If we're building a variable sized type, and we might be
7214 reachable other than via the top of the current binding
7215 level, then create a new BIND_EXPR so that we deallocate
7216 the object at the right time. */
7219 && !TREE_CONSTANT (DECL_SIZE (decl
))
7220 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list
))
7223 bind
= build3 (BIND_EXPR
, void_type_node
, NULL
, NULL
, NULL
);
7224 TREE_SIDE_EFFECTS (bind
) = 1;
7226 BIND_EXPR_BODY (bind
) = push_stmt_list ();
7228 add_decl_expr (decl
);
7231 /* Let the middle end know about variables and functions -- but not
7232 static data members in uninstantiated class templates. */
7233 if (VAR_OR_FUNCTION_DECL_P (decl
))
7237 layout_var_decl (decl
);
7238 maybe_commonize_var (decl
);
7241 /* This needs to happen after the linkage is set. */
7242 determine_visibility (decl
);
7244 if (var_definition_p
&& TREE_STATIC (decl
))
7246 /* If a TREE_READONLY variable needs initialization
7247 at runtime, it is no longer readonly and we need to
7248 avoid MEM_READONLY_P being set on RTL created for it. */
7251 if (TREE_READONLY (decl
))
7252 TREE_READONLY (decl
) = 0;
7255 else if (was_readonly
)
7256 TREE_READONLY (decl
) = 1;
7258 /* Likewise if it needs destruction. */
7259 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
))
7260 TREE_READONLY (decl
) = 0;
7263 make_rtl_for_nonlocal_decl (decl
, init
, asmspec
);
7265 /* Check for abstractness of the type. Notice that there is no
7266 need to strip array types here since the check for those types
7267 is already done within create_array_type_for_decl. */
7268 abstract_virtuals_error (decl
, type
);
7270 if (TREE_TYPE (decl
) == error_mark_node
)
7271 /* No initialization required. */
7273 else if (TREE_CODE (decl
) == FUNCTION_DECL
)
7277 if (init
== ridpointers
[(int)RID_DEFAULT
])
7279 /* An out-of-class default definition is defined at
7280 the point where it is explicitly defaulted. */
7281 if (DECL_DELETED_FN (decl
))
7282 maybe_explain_implicit_delete (decl
);
7283 else if (DECL_INITIAL (decl
) == error_mark_node
)
7284 synthesize_method (decl
);
7287 error ("function %q#D is initialized like a variable", decl
);
7289 /* else no initialization required. */
7291 else if (DECL_EXTERNAL (decl
)
7292 && ! (DECL_LANG_SPECIFIC (decl
)
7293 && DECL_NOT_REALLY_EXTERN (decl
)))
7296 DECL_INITIAL (decl
) = init
;
7298 /* A variable definition. */
7299 else if (DECL_FUNCTION_SCOPE_P (decl
) && !TREE_STATIC (decl
))
7300 /* Initialize the local variable. */
7301 initialize_local_var (decl
, init
);
7303 /* If a variable is defined, and then a subsequent
7304 definition with external linkage is encountered, we will
7305 get here twice for the same variable. We want to avoid
7306 calling expand_static_init more than once. For variables
7307 that are not static data members, we can call
7308 expand_static_init only when we actually process the
7309 initializer. It is not legal to redeclare a static data
7310 member, so this issue does not arise in that case. */
7311 else if (var_definition_p
&& TREE_STATIC (decl
))
7312 expand_static_init (decl
, init
);
7315 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
7316 reference, insert it in the statement-tree now. */
7320 FOR_EACH_VEC_ELT (*cleanups
, i
, t
)
7321 push_cleanup (decl
, t
, false);
7322 release_tree_vector (cleanups
);
7326 TREE_READONLY (decl
) = 1;
7330 && lookup_attribute ("omp declare target implicit",
7331 DECL_ATTRIBUTES (decl
)))
7333 DECL_ATTRIBUTES (decl
)
7334 = remove_attribute ("omp declare target implicit",
7335 DECL_ATTRIBUTES (decl
));
7336 complete_type (TREE_TYPE (decl
));
7337 if (!cp_omp_mappable_type (TREE_TYPE (decl
)))
7338 error ("%q+D in declare target directive does not have mappable type",
7340 else if (!lookup_attribute ("omp declare target",
7341 DECL_ATTRIBUTES (decl
))
7342 && !lookup_attribute ("omp declare target link",
7343 DECL_ATTRIBUTES (decl
)))
7344 DECL_ATTRIBUTES (decl
)
7345 = tree_cons (get_identifier ("omp declare target"),
7346 NULL_TREE
, DECL_ATTRIBUTES (decl
));
7349 invoke_plugin_callbacks (PLUGIN_FINISH_DECL
, decl
);
7352 /* For class TYPE return itself or some its bases that contain
7353 any direct non-static data members. Return error_mark_node if an
7354 error has been diagnosed. */
7357 find_decomp_class_base (location_t loc
, tree type
, tree ret
)
7359 bool member_seen
= false;
7360 for (tree field
= TYPE_FIELDS (type
); field
; field
= DECL_CHAIN (field
))
7361 if (TREE_CODE (field
) != FIELD_DECL
7362 || DECL_ARTIFICIAL (field
)
7363 || DECL_UNNAMED_BIT_FIELD (field
))
7367 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field
)))
7369 if (TREE_CODE (TREE_TYPE (field
)) == RECORD_TYPE
)
7370 error_at (loc
, "cannot decompose class type %qT because it has an "
7371 "anonymous struct member", type
);
7373 error_at (loc
, "cannot decompose class type %qT because it has an "
7374 "anonymous union member", type
);
7375 inform (DECL_SOURCE_LOCATION (field
), "declared here");
7376 return error_mark_node
;
7378 else if (!accessible_p (type
, field
, true))
7380 error_at (loc
, "cannot decompose inaccessible member %qD of %qT",
7382 inform (DECL_SOURCE_LOCATION (field
),
7383 TREE_PRIVATE (field
)
7384 ? G_("declared private here")
7385 : G_("declared protected here"));
7386 return error_mark_node
;
7391 tree base_binfo
, binfo
;
7392 tree orig_ret
= ret
;
7396 for (binfo
= TYPE_BINFO (type
), i
= 0;
7397 BINFO_BASE_ITERATE (binfo
, i
, base_binfo
); i
++)
7399 tree t
= find_decomp_class_base (loc
, TREE_TYPE (base_binfo
), ret
);
7400 if (t
== error_mark_node
)
7401 return error_mark_node
;
7402 if (t
!= NULL_TREE
&& t
!= ret
)
7406 error_at (loc
, "cannot decompose class type %qT: both it and "
7407 "its base class %qT have non-static data members",
7409 return error_mark_node
;
7411 else if (orig_ret
!= NULL_TREE
)
7413 else if (ret
!= NULL_TREE
)
7415 error_at (loc
, "cannot decompose class type %qT: its base "
7416 "classes %qT and %qT have non-static data "
7417 "members", type
, ret
, t
);
7418 return error_mark_node
;
7427 /* Return std::tuple_size<TYPE>::value. */
7430 get_tuple_size (tree type
)
7432 tree args
= make_tree_vec (1);
7433 TREE_VEC_ELT (args
, 0) = type
;
7434 tree inst
= lookup_template_class (tuple_size_identifier
, args
,
7435 /*in_decl*/NULL_TREE
,
7436 /*context*/std_node
,
7437 /*entering_scope*/false, tf_none
);
7438 inst
= complete_type (inst
);
7439 if (inst
== error_mark_node
|| !COMPLETE_TYPE_P (inst
))
7441 tree val
= lookup_qualified_name (inst
, value_identifier
,
7442 /*type*/false, /*complain*/false);
7443 if (TREE_CODE (val
) == VAR_DECL
|| TREE_CODE (val
) == CONST_DECL
)
7444 val
= maybe_constant_value (val
);
7445 if (TREE_CODE (val
) == INTEGER_CST
)
7448 return error_mark_node
;
7451 /* Return std::tuple_element<I,TYPE>::type. */
7454 get_tuple_element_type (tree type
, unsigned i
)
7456 tree args
= make_tree_vec (2);
7457 TREE_VEC_ELT (args
, 0) = build_int_cst (integer_type_node
, i
);
7458 TREE_VEC_ELT (args
, 1) = type
;
7459 tree inst
= lookup_template_class (tuple_element_identifier
, args
,
7460 /*in_decl*/NULL_TREE
,
7461 /*context*/std_node
,
7462 /*entering_scope*/false,
7463 tf_warning_or_error
);
7464 return make_typename_type (inst
, type_identifier
,
7465 none_type
, tf_warning_or_error
);
7468 /* Return e.get<i>() or get<i>(e). */
7471 get_tuple_decomp_init (tree decl
, unsigned i
)
7473 tree targs
= make_tree_vec (1);
7474 TREE_VEC_ELT (targs
, 0) = build_int_cst (integer_type_node
, i
);
7476 tree etype
= TREE_TYPE (decl
);
7477 tree e
= convert_from_reference (decl
);
7479 /* [The id-expression] e is an lvalue if the type of the entity e is an
7480 lvalue reference and an xvalue otherwise. */
7481 if (!TYPE_REF_P (etype
)
7482 || TYPE_REF_IS_RVALUE (etype
))
7485 tree fns
= lookup_qualified_name (TREE_TYPE (e
), get__identifier
,
7486 /*type*/false, /*complain*/false);
7487 bool use_member_get
= false;
7489 /* To use a member get, member lookup must find at least one
7490 declaration that is a function template
7491 whose first template parameter is a non-type parameter. */
7492 for (lkp_iterator
iter (MAYBE_BASELINK_FUNCTIONS (fns
)); iter
; ++iter
)
7495 if (TREE_CODE (fn
) == TEMPLATE_DECL
)
7497 tree tparms
= DECL_TEMPLATE_PARMS (fn
);
7498 tree parm
= TREE_VEC_ELT (INNERMOST_TEMPLATE_PARMS (tparms
), 0);
7499 if (TREE_CODE (TREE_VALUE (parm
)) == PARM_DECL
)
7501 use_member_get
= true;
7509 fns
= lookup_template_function (fns
, targs
);
7510 return build_new_method_call (e
, fns
, /*args*/NULL
,
7511 /*path*/NULL_TREE
, LOOKUP_NORMAL
,
7512 /*fn_p*/NULL
, tf_warning_or_error
);
7516 vec
<tree
,va_gc
> *args
= make_tree_vector_single (e
);
7517 fns
= lookup_template_function (get__identifier
, targs
);
7518 fns
= perform_koenig_lookup (fns
, args
, tf_warning_or_error
);
7519 return finish_call_expr (fns
, &args
, /*novirt*/false,
7520 /*koenig*/true, tf_warning_or_error
);
7524 /* It's impossible to recover the decltype of a tuple decomposition variable
7525 based on the actual type of the variable, so store it in a hash table. */
7527 static GTY((cache
)) tree_cache_map
*decomp_type_table
;
7529 store_decomp_type (tree v
, tree t
)
7531 if (!decomp_type_table
)
7532 decomp_type_table
= tree_cache_map::create_ggc (13);
7533 decomp_type_table
->put (v
, t
);
7537 lookup_decomp_type (tree v
)
7539 return *decomp_type_table
->get (v
);
7542 /* Mangle a decomposition declaration if needed. Arguments like
7543 in cp_finish_decomp. */
7546 cp_maybe_mangle_decomp (tree decl
, tree first
, unsigned int count
)
7548 if (!processing_template_decl
7549 && !error_operand_p (decl
)
7550 && DECL_NAMESPACE_SCOPE_P (decl
))
7552 auto_vec
<tree
, 16> v
;
7553 v
.safe_grow (count
);
7555 for (unsigned int i
= 0; i
< count
; i
++, d
= DECL_CHAIN (d
))
7556 v
[count
- i
- 1] = d
;
7557 SET_DECL_ASSEMBLER_NAME (decl
, mangle_decomp (decl
, v
));
7558 maybe_apply_pragma_weak (decl
);
7562 /* Finish a decomposition declaration. DECL is the underlying declaration
7563 "e", FIRST is the head of a chain of decls for the individual identifiers
7564 chained through DECL_CHAIN in reverse order and COUNT is the number of
7568 cp_finish_decomp (tree decl
, tree first
, unsigned int count
)
7570 if (error_operand_p (decl
))
7575 TREE_TYPE (first
) = error_mark_node
;
7576 if (DECL_HAS_VALUE_EXPR_P (first
))
7578 SET_DECL_VALUE_EXPR (first
, NULL_TREE
);
7579 DECL_HAS_VALUE_EXPR_P (first
) = 0;
7581 first
= DECL_CHAIN (first
);
7583 if (DECL_P (decl
) && DECL_NAMESPACE_SCOPE_P (decl
))
7584 SET_DECL_ASSEMBLER_NAME (decl
, get_identifier ("<decomp>"));
7588 location_t loc
= DECL_SOURCE_LOCATION (decl
);
7589 if (type_dependent_expression_p (decl
)
7590 /* This happens for range for when not in templates.
7591 Still add the DECL_VALUE_EXPRs for later processing. */
7592 || (!processing_template_decl
7593 && type_uses_auto (TREE_TYPE (decl
))))
7595 for (unsigned int i
= 0; i
< count
; i
++)
7597 if (!DECL_HAS_VALUE_EXPR_P (first
))
7599 tree v
= build_nt (ARRAY_REF
, decl
,
7600 size_int (count
- i
- 1),
7601 NULL_TREE
, NULL_TREE
);
7602 SET_DECL_VALUE_EXPR (first
, v
);
7603 DECL_HAS_VALUE_EXPR_P (first
) = 1;
7605 if (processing_template_decl
)
7606 fit_decomposition_lang_decl (first
, decl
);
7607 first
= DECL_CHAIN (first
);
7612 auto_vec
<tree
, 16> v
;
7613 v
.safe_grow (count
);
7615 for (unsigned int i
= 0; i
< count
; i
++, d
= DECL_CHAIN (d
))
7617 v
[count
- i
- 1] = d
;
7618 fit_decomposition_lang_decl (d
, decl
);
7621 tree type
= TREE_TYPE (decl
);
7624 if (TYPE_REF_P (type
))
7626 dexp
= convert_from_reference (dexp
);
7627 type
= complete_type (TREE_TYPE (type
));
7628 if (type
== error_mark_node
)
7630 if (!COMPLETE_TYPE_P (type
))
7632 error_at (loc
, "structured binding refers to incomplete type %qT",
7638 tree eltype
= NULL_TREE
;
7639 unsigned HOST_WIDE_INT eltscnt
= 0;
7640 if (TREE_CODE (type
) == ARRAY_TYPE
)
7643 nelts
= array_type_nelts_top (type
);
7644 if (nelts
== error_mark_node
)
7646 if (!tree_fits_uhwi_p (nelts
))
7648 error_at (loc
, "cannot decompose variable length array %qT", type
);
7651 eltscnt
= tree_to_uhwi (nelts
);
7652 if (count
!= eltscnt
)
7655 if (count
> eltscnt
)
7656 error_n (loc
, count
,
7657 "%u name provided for structured binding",
7658 "%u names provided for structured binding", count
);
7660 error_n (loc
, count
,
7661 "only %u name provided for structured binding",
7662 "only %u names provided for structured binding", count
);
7663 inform_n (loc
, eltscnt
,
7664 "while %qT decomposes into %wu element",
7665 "while %qT decomposes into %wu elements",
7669 eltype
= TREE_TYPE (type
);
7670 for (unsigned int i
= 0; i
< count
; i
++)
7672 TREE_TYPE (v
[i
]) = eltype
;
7673 layout_decl (v
[i
], 0);
7674 if (processing_template_decl
)
7676 tree t
= unshare_expr (dexp
);
7677 t
= build4_loc (DECL_SOURCE_LOCATION (v
[i
]), ARRAY_REF
,
7678 eltype
, t
, size_int (i
), NULL_TREE
,
7680 SET_DECL_VALUE_EXPR (v
[i
], t
);
7681 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7684 /* 2 GNU extensions. */
7685 else if (TREE_CODE (type
) == COMPLEX_TYPE
)
7688 if (count
!= eltscnt
)
7690 eltype
= cp_build_qualified_type (TREE_TYPE (type
), TYPE_QUALS (type
));
7691 for (unsigned int i
= 0; i
< count
; i
++)
7693 TREE_TYPE (v
[i
]) = eltype
;
7694 layout_decl (v
[i
], 0);
7695 if (processing_template_decl
)
7697 tree t
= unshare_expr (dexp
);
7698 t
= build1_loc (DECL_SOURCE_LOCATION (v
[i
]),
7699 i
? IMAGPART_EXPR
: REALPART_EXPR
, eltype
,
7701 SET_DECL_VALUE_EXPR (v
[i
], t
);
7702 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7705 else if (TREE_CODE (type
) == VECTOR_TYPE
)
7707 if (!TYPE_VECTOR_SUBPARTS (type
).is_constant (&eltscnt
))
7709 error_at (loc
, "cannot decompose variable length vector %qT", type
);
7712 if (count
!= eltscnt
)
7714 eltype
= cp_build_qualified_type (TREE_TYPE (type
), TYPE_QUALS (type
));
7715 for (unsigned int i
= 0; i
< count
; i
++)
7717 TREE_TYPE (v
[i
]) = eltype
;
7718 layout_decl (v
[i
], 0);
7719 if (processing_template_decl
)
7721 tree t
= unshare_expr (dexp
);
7722 convert_vector_to_array_for_subscript (DECL_SOURCE_LOCATION (v
[i
]),
7724 t
= build4_loc (DECL_SOURCE_LOCATION (v
[i
]), ARRAY_REF
,
7725 eltype
, t
, size_int (i
), NULL_TREE
,
7727 SET_DECL_VALUE_EXPR (v
[i
], t
);
7728 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7731 else if (tree tsize
= get_tuple_size (type
))
7733 if (tsize
== error_mark_node
)
7735 error_at (loc
, "%<std::tuple_size<%T>::value%> is not an integral "
7736 "constant expression", type
);
7739 if (!tree_fits_uhwi_p (tsize
))
7741 error_n (loc
, count
,
7742 "%u name provided for structured binding",
7743 "%u names provided for structured binding", count
);
7744 inform (loc
, "while %qT decomposes into %E elements",
7748 eltscnt
= tree_to_uhwi (tsize
);
7749 if (count
!= eltscnt
)
7751 int save_read
= DECL_READ_P (decl
);
7752 for (unsigned i
= 0; i
< count
; ++i
)
7754 location_t sloc
= input_location
;
7755 location_t dloc
= DECL_SOURCE_LOCATION (v
[i
]);
7757 input_location
= dloc
;
7758 tree init
= get_tuple_decomp_init (decl
, i
);
7759 tree eltype
= (init
== error_mark_node
? error_mark_node
7760 : get_tuple_element_type (type
, i
));
7761 input_location
= sloc
;
7763 if (init
== error_mark_node
|| eltype
== error_mark_node
)
7765 inform (dloc
, "in initialization of structured binding "
7766 "variable %qD", v
[i
]);
7769 /* Save the decltype away before reference collapse. */
7770 store_decomp_type (v
[i
], eltype
);
7771 eltype
= cp_build_reference_type (eltype
, !lvalue_p (init
));
7772 TREE_TYPE (v
[i
]) = eltype
;
7773 layout_decl (v
[i
], 0);
7774 if (DECL_HAS_VALUE_EXPR_P (v
[i
]))
7776 /* In this case the names are variables, not just proxies. */
7777 SET_DECL_VALUE_EXPR (v
[i
], NULL_TREE
);
7778 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 0;
7780 if (!processing_template_decl
)
7781 cp_finish_decl (v
[i
], init
, /*constexpr*/false,
7782 /*asm*/NULL_TREE
, LOOKUP_NORMAL
);
7784 /* Ignore reads from the underlying decl performed during initialization
7785 of the individual variables. If those will be read, we'll mark
7786 the underlying decl as read at that point. */
7787 DECL_READ_P (decl
) = save_read
;
7789 else if (TREE_CODE (type
) == UNION_TYPE
)
7791 error_at (loc
, "cannot decompose union type %qT", type
);
7794 else if (!CLASS_TYPE_P (type
))
7796 error_at (loc
, "cannot decompose non-array non-class type %qT", type
);
7799 else if (LAMBDA_TYPE_P (type
))
7801 error_at (loc
, "cannot decompose lambda closure type %qT", type
);
7804 else if (processing_template_decl
&& !COMPLETE_TYPE_P (type
))
7805 pedwarn (loc
, 0, "structured binding refers to incomplete class type %qT",
7809 tree btype
= find_decomp_class_base (loc
, type
, NULL_TREE
);
7810 if (btype
== error_mark_node
)
7812 else if (btype
== NULL_TREE
)
7814 error_at (loc
, "cannot decompose class type %qT without non-static "
7815 "data members", type
);
7818 for (tree field
= TYPE_FIELDS (btype
); field
; field
= TREE_CHAIN (field
))
7819 if (TREE_CODE (field
) != FIELD_DECL
7820 || DECL_ARTIFICIAL (field
)
7821 || DECL_UNNAMED_BIT_FIELD (field
))
7825 if (count
!= eltscnt
)
7830 t
= convert_to_base (t
, btype
, /*check_access*/true,
7831 /*nonnull*/false, tf_warning_or_error
);
7835 for (tree field
= TYPE_FIELDS (btype
); field
; field
= TREE_CHAIN (field
))
7836 if (TREE_CODE (field
) != FIELD_DECL
7837 || DECL_ARTIFICIAL (field
)
7838 || DECL_UNNAMED_BIT_FIELD (field
))
7842 tree tt
= finish_non_static_data_member (field
, unshare_expr (t
),
7844 if (REFERENCE_REF_P (tt
))
7845 tt
= TREE_OPERAND (tt
, 0);
7846 TREE_TYPE (v
[i
]) = TREE_TYPE (tt
);
7847 layout_decl (v
[i
], 0);
7848 if (!processing_template_decl
)
7850 SET_DECL_VALUE_EXPR (v
[i
], tt
);
7851 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7856 if (processing_template_decl
)
7858 for (unsigned int i
= 0; i
< count
; i
++)
7859 if (!DECL_HAS_VALUE_EXPR_P (v
[i
]))
7861 tree a
= build_nt (ARRAY_REF
, decl
, size_int (i
),
7862 NULL_TREE
, NULL_TREE
);
7863 SET_DECL_VALUE_EXPR (v
[i
], a
);
7864 DECL_HAS_VALUE_EXPR_P (v
[i
]) = 1;
7869 /* Returns a declaration for a VAR_DECL as if:
7871 extern "C" TYPE NAME;
7873 had been seen. Used to create compiler-generated global
7877 declare_global_var (tree name
, tree type
)
7881 push_to_top_level ();
7882 decl
= build_decl (input_location
, VAR_DECL
, name
, type
);
7883 TREE_PUBLIC (decl
) = 1;
7884 DECL_EXTERNAL (decl
) = 1;
7885 DECL_ARTIFICIAL (decl
) = 1;
7886 DECL_CONTEXT (decl
) = FROB_CONTEXT (global_namespace
);
7887 /* If the user has explicitly declared this variable (perhaps
7888 because the code we are compiling is part of a low-level runtime
7889 library), then it is possible that our declaration will be merged
7890 with theirs by pushdecl. */
7891 decl
= pushdecl (decl
);
7892 cp_finish_decl (decl
, NULL_TREE
, false, NULL_TREE
, 0);
7893 pop_from_top_level ();
7898 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
7899 if "__cxa_atexit" is not being used) corresponding to the function
7900 to be called when the program exits. */
7903 get_atexit_fn_ptr_type (void)
7907 if (!atexit_fn_ptr_type_node
)
7910 if (flag_use_cxa_atexit
7911 && !targetm
.cxx
.use_atexit_for_cxa_atexit ())
7912 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
7913 arg_type
= ptr_type_node
;
7915 /* The parameter to "atexit" is "void (*)(void)". */
7916 arg_type
= NULL_TREE
;
7918 fn_type
= build_function_type_list (void_type_node
,
7919 arg_type
, NULL_TREE
);
7920 atexit_fn_ptr_type_node
= build_pointer_type (fn_type
);
7923 return atexit_fn_ptr_type_node
;
7926 /* Returns a pointer to the `atexit' function. Note that if
7927 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
7928 `__cxa_atexit' function specified in the IA64 C++ ABI. */
7931 get_atexit_node (void)
7937 bool use_aeabi_atexit
;
7942 if (flag_use_cxa_atexit
&& !targetm
.cxx
.use_atexit_for_cxa_atexit ())
7944 /* The declaration for `__cxa_atexit' is:
7946 int __cxa_atexit (void (*)(void *), void *, void *)
7948 We build up the argument types and then the function type
7950 tree argtype0
, argtype1
, argtype2
;
7952 use_aeabi_atexit
= targetm
.cxx
.use_aeabi_atexit ();
7953 /* First, build the pointer-to-function type for the first
7955 fn_ptr_type
= get_atexit_fn_ptr_type ();
7956 /* Then, build the rest of the argument types. */
7957 argtype2
= ptr_type_node
;
7958 if (use_aeabi_atexit
)
7960 argtype1
= fn_ptr_type
;
7961 argtype0
= ptr_type_node
;
7965 argtype1
= ptr_type_node
;
7966 argtype0
= fn_ptr_type
;
7968 /* And the final __cxa_atexit type. */
7969 fn_type
= build_function_type_list (integer_type_node
,
7970 argtype0
, argtype1
, argtype2
,
7972 if (use_aeabi_atexit
)
7973 name
= "__aeabi_atexit";
7975 name
= "__cxa_atexit";
7979 /* The declaration for `atexit' is:
7981 int atexit (void (*)());
7983 We build up the argument types and then the function type
7985 fn_ptr_type
= get_atexit_fn_ptr_type ();
7986 /* Build the final atexit type. */
7987 fn_type
= build_function_type_list (integer_type_node
,
7988 fn_ptr_type
, NULL_TREE
);
7992 /* Now, build the function declaration. */
7993 push_lang_context (lang_name_c
);
7994 atexit_fndecl
= build_library_fn_ptr (name
, fn_type
, ECF_LEAF
| ECF_NOTHROW
);
7995 mark_used (atexit_fndecl
);
7996 pop_lang_context ();
7997 atexit_node
= decay_conversion (atexit_fndecl
, tf_warning_or_error
);
8002 /* Like get_atexit_node, but for thread-local cleanups. */
8005 get_thread_atexit_node (void)
8007 /* The declaration for `__cxa_thread_atexit' is:
8009 int __cxa_thread_atexit (void (*)(void *), void *, void *) */
8010 tree fn_type
= build_function_type_list (integer_type_node
,
8011 get_atexit_fn_ptr_type (),
8012 ptr_type_node
, ptr_type_node
,
8015 /* Now, build the function declaration. */
8016 tree atexit_fndecl
= build_library_fn_ptr ("__cxa_thread_atexit", fn_type
,
8017 ECF_LEAF
| ECF_NOTHROW
);
8018 return decay_conversion (atexit_fndecl
, tf_warning_or_error
);
8021 /* Returns the __dso_handle VAR_DECL. */
8024 get_dso_handle_node (void)
8026 if (dso_handle_node
)
8027 return dso_handle_node
;
8029 /* Declare the variable. */
8030 dso_handle_node
= declare_global_var (get_identifier ("__dso_handle"),
8033 #ifdef HAVE_GAS_HIDDEN
8034 if (dso_handle_node
!= error_mark_node
)
8036 DECL_VISIBILITY (dso_handle_node
) = VISIBILITY_HIDDEN
;
8037 DECL_VISIBILITY_SPECIFIED (dso_handle_node
) = 1;
8041 return dso_handle_node
;
8044 /* Begin a new function with internal linkage whose job will be simply
8045 to destroy some particular variable. */
8047 static GTY(()) int start_cleanup_cnt
;
8050 start_cleanup_fn (void)
8055 bool use_cxa_atexit
= flag_use_cxa_atexit
8056 && !targetm
.cxx
.use_atexit_for_cxa_atexit ();
8058 push_to_top_level ();
8060 /* No need to mangle this. */
8061 push_lang_context (lang_name_c
);
8063 /* Build the name of the function. */
8064 sprintf (name
, "__tcf_%d", start_cleanup_cnt
++);
8065 /* Build the function declaration. */
8066 fntype
= TREE_TYPE (get_atexit_fn_ptr_type ());
8067 fndecl
= build_lang_decl (FUNCTION_DECL
, get_identifier (name
), fntype
);
8068 /* It's a function with internal linkage, generated by the
8070 TREE_PUBLIC (fndecl
) = 0;
8071 DECL_ARTIFICIAL (fndecl
) = 1;
8072 /* Make the function `inline' so that it is only emitted if it is
8073 actually needed. It is unlikely that it will be inlined, since
8074 it is only called via a function pointer, but we avoid unnecessary
8075 emissions this way. */
8076 DECL_DECLARED_INLINE_P (fndecl
) = 1;
8077 DECL_INTERFACE_KNOWN (fndecl
) = 1;
8078 /* Build the parameter. */
8081 tree parmdecl
= cp_build_parm_decl (fndecl
, NULL_TREE
, ptr_type_node
);
8082 TREE_USED (parmdecl
) = 1;
8083 DECL_READ_P (parmdecl
) = 1;
8084 DECL_ARGUMENTS (fndecl
) = parmdecl
;
8088 start_preparsed_function (fndecl
, NULL_TREE
, SF_PRE_PARSED
);
8090 pop_lang_context ();
8092 return current_function_decl
;
8095 /* Finish the cleanup function begun by start_cleanup_fn. */
8098 end_cleanup_fn (void)
8100 expand_or_defer_fn (finish_function (/*inline_p=*/false));
8102 pop_from_top_level ();
8105 /* Generate code to handle the destruction of DECL, an object with
8106 static storage duration. */
8109 register_dtor_fn (tree decl
)
8116 bool ob_parm
, dso_parm
, use_dtor
;
8117 tree arg0
, arg1
, arg2
;
8120 type
= TREE_TYPE (decl
);
8121 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type
))
8124 /* If we're using "__cxa_atexit" (or "__cxa_thread_atexit" or
8125 "__aeabi_atexit"), and DECL is a class object, we can just pass the
8126 destructor to "__cxa_atexit"; we don't have to build a temporary
8127 function to do the cleanup. */
8128 dso_parm
= (flag_use_cxa_atexit
8129 && !targetm
.cxx
.use_atexit_for_cxa_atexit ());
8130 ob_parm
= (CP_DECL_THREAD_LOCAL_P (decl
) || dso_parm
);
8131 use_dtor
= ob_parm
&& CLASS_TYPE_P (type
);
8134 cleanup
= get_class_binding (type
, complete_dtor_identifier
);
8136 /* Make sure it is accessible. */
8137 perform_or_defer_access_check (TYPE_BINFO (type
), cleanup
, cleanup
,
8138 tf_warning_or_error
);
8142 /* Call build_cleanup before we enter the anonymous function so
8143 that any access checks will be done relative to the current
8144 scope, rather than the scope of the anonymous function. */
8145 build_cleanup (decl
);
8147 /* Now start the function. */
8148 cleanup
= start_cleanup_fn ();
8150 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
8151 to the original function, rather than the anonymous one. That
8152 will make the back end think that nested functions are in use,
8153 which causes confusion. */
8154 push_deferring_access_checks (dk_no_check
);
8155 fcall
= build_cleanup (decl
);
8156 pop_deferring_access_checks ();
8158 /* Create the body of the anonymous function. */
8159 compound_stmt
= begin_compound_stmt (BCS_FN_BODY
);
8160 finish_expr_stmt (fcall
);
8161 finish_compound_stmt (compound_stmt
);
8165 /* Call atexit with the cleanup function. */
8166 mark_used (cleanup
);
8167 cleanup
= build_address (cleanup
);
8169 if (CP_DECL_THREAD_LOCAL_P (decl
))
8170 atex_node
= get_thread_atexit_node ();
8172 atex_node
= get_atexit_node ();
8176 /* We must convert CLEANUP to the type that "__cxa_atexit"
8178 cleanup
= build_nop (get_atexit_fn_ptr_type (), cleanup
);
8179 /* "__cxa_atexit" will pass the address of DECL to the
8180 cleanup function. */
8182 addr
= build_address (decl
);
8183 /* The declared type of the parameter to "__cxa_atexit" is
8184 "void *". For plain "T*", we could just let the
8185 machinery in cp_build_function_call convert it -- but if the
8186 type is "cv-qualified T *", then we need to convert it
8187 before passing it in, to avoid spurious errors. */
8188 addr
= build_nop (ptr_type_node
, addr
);
8191 /* Since the cleanup functions we build ignore the address
8192 they're given, there's no reason to pass the actual address
8193 in, and, in general, it's cheaper to pass NULL than any
8195 addr
= null_pointer_node
;
8198 arg2
= cp_build_addr_expr (get_dso_handle_node (),
8199 tf_warning_or_error
);
8201 /* Just pass NULL to the dso handle parm if we don't actually
8202 have a DSO handle on this target. */
8203 arg2
= null_pointer_node
;
8209 if (!CP_DECL_THREAD_LOCAL_P (decl
)
8210 && targetm
.cxx
.use_aeabi_atexit ())
8226 return cp_build_function_call_nary (atex_node
, tf_warning_or_error
,
8227 arg0
, arg1
, arg2
, NULL_TREE
);
8230 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
8231 is its initializer. Generate code to handle the construction
8232 and destruction of DECL. */
8235 expand_static_init (tree decl
, tree init
)
8237 gcc_assert (VAR_P (decl
));
8238 gcc_assert (TREE_STATIC (decl
));
8240 /* Some variables require no dynamic initialization. */
8241 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl
)))
8243 /* Make sure the destructor is callable. */
8244 cxx_maybe_build_cleanup (decl
, tf_warning_or_error
);
8249 if (CP_DECL_THREAD_LOCAL_P (decl
) && DECL_GNU_TLS_P (decl
)
8250 && !DECL_FUNCTION_SCOPE_P (decl
))
8253 error ("non-local variable %qD declared %<__thread%> "
8254 "needs dynamic initialization", decl
);
8256 error ("non-local variable %qD declared %<__thread%> "
8257 "has a non-trivial destructor", decl
);
8258 static bool informed
;
8261 inform (DECL_SOURCE_LOCATION (decl
),
8262 "C++11 %<thread_local%> allows dynamic initialization "
8269 if (DECL_FUNCTION_SCOPE_P (decl
))
8271 /* Emit code to perform this initialization but once. */
8272 tree if_stmt
= NULL_TREE
, inner_if_stmt
= NULL_TREE
;
8273 tree then_clause
= NULL_TREE
, inner_then_clause
= NULL_TREE
;
8274 tree guard
, guard_addr
;
8276 /* We don't need thread-safety code for thread-local vars. */
8277 bool thread_guard
= (flag_threadsafe_statics
8278 && !CP_DECL_THREAD_LOCAL_P (decl
));
8280 /* Emit code to perform this initialization but once. This code
8283 static <type> guard;
8284 if (!__atomic_load (guard.first_byte)) {
8285 if (__cxa_guard_acquire (&guard)) {
8288 // Do initialization.
8289 flag = true; __cxa_guard_release (&guard);
8290 // Register variable for destruction at end of program.
8292 if (!flag) __cxa_guard_abort (&guard);
8297 Note that the `flag' variable is only set to 1 *after* the
8298 initialization is complete. This ensures that an exception,
8299 thrown during the construction, will cause the variable to
8300 reinitialized when we pass through this code again, as per:
8304 If the initialization exits by throwing an exception, the
8305 initialization is not complete, so it will be tried again
8306 the next time control enters the declaration.
8308 This process should be thread-safe, too; multiple threads
8309 should not be able to initialize the variable more than
8312 /* Create the guard variable. */
8313 guard
= get_guard (decl
);
8315 /* Begin the conditional initialization. */
8316 if_stmt
= begin_if_stmt ();
8318 finish_if_stmt_cond (get_guard_cond (guard
, thread_guard
), if_stmt
);
8319 then_clause
= begin_compound_stmt (BCS_NO_SCOPE
);
8323 tree vfntype
= NULL_TREE
;
8324 tree acquire_name
, release_name
, abort_name
;
8325 tree acquire_fn
, release_fn
, abort_fn
;
8326 guard_addr
= build_address (guard
);
8328 acquire_name
= get_identifier ("__cxa_guard_acquire");
8329 release_name
= get_identifier ("__cxa_guard_release");
8330 abort_name
= get_identifier ("__cxa_guard_abort");
8331 acquire_fn
= get_global_binding (acquire_name
);
8332 release_fn
= get_global_binding (release_name
);
8333 abort_fn
= get_global_binding (abort_name
);
8335 acquire_fn
= push_library_fn
8336 (acquire_name
, build_function_type_list (integer_type_node
,
8337 TREE_TYPE (guard_addr
),
8339 NULL_TREE
, ECF_NOTHROW
| ECF_LEAF
);
8340 if (!release_fn
|| !abort_fn
)
8341 vfntype
= build_function_type_list (void_type_node
,
8342 TREE_TYPE (guard_addr
),
8345 release_fn
= push_library_fn (release_name
, vfntype
, NULL_TREE
,
8346 ECF_NOTHROW
| ECF_LEAF
);
8348 abort_fn
= push_library_fn (abort_name
, vfntype
, NULL_TREE
,
8349 ECF_NOTHROW
| ECF_LEAF
);
8351 inner_if_stmt
= begin_if_stmt ();
8352 finish_if_stmt_cond (build_call_n (acquire_fn
, 1, guard_addr
),
8355 inner_then_clause
= begin_compound_stmt (BCS_NO_SCOPE
);
8356 begin
= get_target_expr (boolean_false_node
);
8357 flag
= TARGET_EXPR_SLOT (begin
);
8359 TARGET_EXPR_CLEANUP (begin
)
8360 = build3 (COND_EXPR
, void_type_node
, flag
,
8362 build_call_n (abort_fn
, 1, guard_addr
));
8363 CLEANUP_EH_ONLY (begin
) = 1;
8365 /* Do the initialization itself. */
8366 init
= add_stmt_to_compound (begin
, init
);
8367 init
= add_stmt_to_compound
8368 (init
, build2 (MODIFY_EXPR
, void_type_node
, flag
, boolean_true_node
));
8369 init
= add_stmt_to_compound
8370 (init
, build_call_n (release_fn
, 1, guard_addr
));
8373 init
= add_stmt_to_compound (init
, set_guard (guard
));
8375 /* Use atexit to register a function for destroying this static
8377 init
= add_stmt_to_compound (init
, register_dtor_fn (decl
));
8379 finish_expr_stmt (init
);
8383 finish_compound_stmt (inner_then_clause
);
8384 finish_then_clause (inner_if_stmt
);
8385 finish_if_stmt (inner_if_stmt
);
8388 finish_compound_stmt (then_clause
);
8389 finish_then_clause (if_stmt
);
8390 finish_if_stmt (if_stmt
);
8392 else if (CP_DECL_THREAD_LOCAL_P (decl
))
8393 tls_aggregates
= tree_cons (init
, decl
, tls_aggregates
);
8395 static_aggregates
= tree_cons (init
, decl
, static_aggregates
);
8399 /* Make TYPE a complete type based on INITIAL_VALUE.
8400 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
8401 2 if there was no information (in which case assume 0 if DO_DEFAULT),
8402 3 if the initializer list is empty (in pedantic mode). */
8405 cp_complete_array_type (tree
*ptype
, tree initial_value
, bool do_default
)
8408 tree type
, elt_type
;
8410 /* Don't get confused by a CONSTRUCTOR for some other type. */
8411 if (initial_value
&& TREE_CODE (initial_value
) == CONSTRUCTOR
8412 && !BRACE_ENCLOSED_INITIALIZER_P (initial_value
)
8413 && TREE_CODE (TREE_TYPE (initial_value
)) != ARRAY_TYPE
)
8418 unsigned HOST_WIDE_INT i
;
8421 /* An array of character type can be initialized from a
8422 brace-enclosed string constant.
8424 FIXME: this code is duplicated from reshape_init. Probably
8425 we should just call reshape_init here? */
8426 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype
)))
8427 && TREE_CODE (initial_value
) == CONSTRUCTOR
8428 && !vec_safe_is_empty (CONSTRUCTOR_ELTS (initial_value
)))
8430 vec
<constructor_elt
, va_gc
> *v
= CONSTRUCTOR_ELTS (initial_value
);
8431 tree value
= (*v
)[0].value
;
8433 if (TREE_CODE (value
) == STRING_CST
8434 && v
->length () == 1)
8435 initial_value
= value
;
8438 /* If any of the elements are parameter packs, we can't actually
8439 complete this type now because the array size is dependent. */
8440 if (TREE_CODE (initial_value
) == CONSTRUCTOR
)
8442 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value
),
8445 if (PACK_EXPANSION_P (value
))
8451 failure
= complete_array_type (ptype
, initial_value
, do_default
);
8453 /* We can create the array before the element type is complete, which
8454 means that we didn't have these two bits set in the original type
8455 either. In completing the type, we are expected to propagate these
8456 bits. See also complete_type which does the same thing for arrays
8459 if (type
!= error_mark_node
&& TYPE_DOMAIN (type
))
8461 elt_type
= TREE_TYPE (type
);
8462 TYPE_NEEDS_CONSTRUCTING (type
) = TYPE_NEEDS_CONSTRUCTING (elt_type
);
8463 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
)
8464 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type
);
8470 /* As above, but either give an error or reject zero-size arrays, depending
8474 cp_complete_array_type_or_error (tree
*ptype
, tree initial_value
,
8475 bool do_default
, tsubst_flags_t complain
)
8478 bool sfinae
= !(complain
& tf_error
);
8479 /* In SFINAE context we can't be lenient about zero-size arrays. */
8482 failure
= cp_complete_array_type (ptype
, initial_value
, do_default
);
8488 /* Not an error. */;
8489 else if (failure
== 1)
8490 error ("initializer fails to determine size of %qT", *ptype
);
8491 else if (failure
== 2)
8494 error ("array size missing in %qT", *ptype
);
8496 else if (failure
== 3)
8497 error ("zero-size array %qT", *ptype
);
8498 *ptype
= error_mark_node
;
8503 /* Return zero if something is declared to be a member of type
8504 CTYPE when in the context of CUR_TYPE. STRING is the error
8505 message to print in that case. Otherwise, quietly return 1. */
8508 member_function_or_else (tree ctype
, tree cur_type
, enum overload_flags flags
)
8510 if (ctype
&& ctype
!= cur_type
)
8512 if (flags
== DTOR_FLAG
)
8513 error ("destructor for alien class %qT cannot be a member", ctype
);
8515 error ("constructor for alien class %qT cannot be a member", ctype
);
8521 /* Subroutine of `grokdeclarator'. */
8523 /* Generate errors possibly applicable for a given set of specifiers.
8524 This is for ARM $7.1.2. */
8527 bad_specifiers (tree object
,
8528 enum bad_spec_place type
,
8534 const location_t
* locations
)
8540 error_at (locations
[ds_virtual
],
8541 "%qD declared as a %<virtual%> variable", object
);
8543 error ("%<const%> and %<volatile%> function specifiers on "
8544 "%qD invalid in variable declaration", object
);
8548 error_at (locations
[ds_virtual
],
8549 "%qD declared as a %<virtual%> parameter", object
);
8551 error_at (locations
[ds_inline
],
8552 "%qD declared as an %<inline%> parameter", object
);
8554 error ("%<const%> and %<volatile%> function specifiers on "
8555 "%qD invalid in parameter declaration", object
);
8559 error_at (locations
[ds_virtual
],
8560 "%qD declared as a %<virtual%> type", object
);
8562 error_at (locations
[ds_inline
],
8563 "%qD declared as an %<inline%> type", object
);
8565 error ("%<const%> and %<volatile%> function specifiers on "
8566 "%qD invalid in type declaration", object
);
8570 error_at (locations
[ds_virtual
],
8571 "%qD declared as a %<virtual%> field", object
);
8573 error_at (locations
[ds_inline
],
8574 "%qD declared as an %<inline%> field", object
);
8576 error ("%<const%> and %<volatile%> function specifiers on "
8577 "%qD invalid in field declaration", object
);
8583 error ("%q+D declared as a friend", object
);
8585 && !flag_noexcept_type
8586 && (TREE_CODE (object
) == TYPE_DECL
8587 || (!TYPE_PTRFN_P (TREE_TYPE (object
))
8588 && !TYPE_REFFN_P (TREE_TYPE (object
))
8589 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object
)))))
8590 error ("%q+D declared with an exception specification", object
);
8593 /* DECL is a member function or static data member and is presently
8594 being defined. Check that the definition is taking place in a
8598 check_class_member_definition_namespace (tree decl
)
8600 /* These checks only apply to member functions and static data
8602 gcc_assert (VAR_OR_FUNCTION_DECL_P (decl
));
8603 /* We check for problems with specializations in pt.c in
8604 check_specialization_namespace, where we can issue better
8606 if (processing_specialization
)
8608 /* We check this in check_explicit_instantiation_namespace. */
8609 if (processing_explicit_instantiation
)
8613 A member function definition that appears outside of the
8614 class definition shall appear in a namespace scope enclosing
8615 the class definition.
8619 The definition for a static data member shall appear in a
8620 namespace scope enclosing the member's class definition. */
8621 if (!is_ancestor (current_namespace
, DECL_CONTEXT (decl
)))
8622 permerror (input_location
, "definition of %qD is not in namespace enclosing %qT",
8623 decl
, DECL_CONTEXT (decl
));
8626 /* Build a PARM_DECL for the "this" parameter of FN. TYPE is the
8627 METHOD_TYPE for a non-static member function; QUALS are the
8628 cv-qualifiers that apply to the function. */
8631 build_this_parm (tree fn
, tree type
, cp_cv_quals quals
)
8636 cp_cv_quals this_quals
;
8638 if (CLASS_TYPE_P (type
))
8641 = cp_build_qualified_type (type
, quals
& ~TYPE_QUAL_RESTRICT
);
8642 this_type
= build_pointer_type (this_type
);
8645 this_type
= type_of_this_parm (type
);
8646 /* The `this' parameter is implicitly `const'; it cannot be
8648 this_quals
= (quals
& TYPE_QUAL_RESTRICT
) | TYPE_QUAL_CONST
;
8649 qual_type
= cp_build_qualified_type (this_type
, this_quals
);
8650 parm
= build_artificial_parm (fn
, this_identifier
, qual_type
);
8651 cp_apply_type_quals_to_decl (this_quals
, parm
);
8655 /* DECL is a static member function. Complain if it was declared
8656 with function-cv-quals. */
8659 check_static_quals (tree decl
, cp_cv_quals quals
)
8661 if (quals
!= TYPE_UNQUALIFIED
)
8662 error ("static member function %q#D declared with type qualifiers",
8666 // Check that FN takes no arguments and returns bool.
8668 check_concept_fn (tree fn
)
8670 // A constraint is nullary.
8671 if (DECL_ARGUMENTS (fn
))
8672 error_at (DECL_SOURCE_LOCATION (fn
),
8673 "concept %q#D declared with function parameters", fn
);
8675 // The declared return type of the concept shall be bool, and
8676 // it shall not be deduced from it definition.
8677 tree type
= TREE_TYPE (TREE_TYPE (fn
));
8679 error_at (DECL_SOURCE_LOCATION (fn
),
8680 "concept %q#D declared with a deduced return type", fn
);
8681 else if (type
!= boolean_type_node
)
8682 error_at (DECL_SOURCE_LOCATION (fn
),
8683 "concept %q#D with non-%<bool%> return type %qT", fn
, type
);
8686 /* Helper function. Replace the temporary this parameter injected
8687 during cp_finish_omp_declare_simd with the real this parameter. */
8690 declare_simd_adjust_this (tree
*tp
, int *walk_subtrees
, void *data
)
8692 tree this_parm
= (tree
) data
;
8693 if (TREE_CODE (*tp
) == PARM_DECL
8694 && DECL_NAME (*tp
) == this_identifier
8695 && *tp
!= this_parm
)
8697 else if (TYPE_P (*tp
))
8702 /* CTYPE is class type, or null if non-class.
8703 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
8705 DECLARATOR is the function's name.
8706 PARMS is a chain of PARM_DECLs for the function.
8707 VIRTUALP is truthvalue of whether the function is virtual or not.
8708 FLAGS are to be passed through to `grokclassfn'.
8709 QUALS are qualifiers indicating whether the function is `const'
8711 RAISES is a list of exceptions that this function can raise.
8712 CHECK is 1 if we must find this method in CTYPE, 0 if we should
8713 not look, and -1 if we should not call `grokclassfn' at all.
8715 SFK is the kind of special function (if any) for the new function.
8717 Returns `NULL_TREE' if something goes wrong, after issuing
8718 applicable error messages. */
8721 grokfndecl (tree ctype
,
8725 tree orig_declarator
,
8726 const cp_decl_specifier_seq
*declspecs
,
8729 enum overload_flags flags
,
8731 cp_ref_qualifier rqual
,
8738 special_function_kind sfk
,
8740 bool late_return_type_p
,
8744 location_t location
)
8747 int staticp
= ctype
&& TREE_CODE (type
) == FUNCTION_TYPE
;
8750 if (location
== UNKNOWN_LOCATION
)
8751 location
= input_location
;
8753 // Was the concept specifier present?
8754 bool concept_p
= inlinep
& 4;
8756 // Concept declarations must have a corresponding definition.
8757 if (concept_p
&& !funcdef_flag
)
8759 error_at (location
, "concept %qD has no definition", declarator
);
8763 type
= build_cp_fntype_variant (type
, rqual
, raises
, late_return_type_p
);
8765 decl
= build_lang_decl_loc (location
, FUNCTION_DECL
, declarator
, type
);
8767 /* Set the constraints on the declaration. */
8770 tree tmpl_reqs
= NULL_TREE
;
8771 if (processing_template_decl
> template_class_depth (ctype
))
8772 tmpl_reqs
= TEMPLATE_PARMS_CONSTRAINTS (current_template_parms
);
8774 /* Adjust the required expression into a constraint. */
8776 decl_reqs
= normalize_expression (decl_reqs
);
8778 tree ci
= build_constraints (tmpl_reqs
, decl_reqs
);
8779 set_constraints (decl
, ci
);
8782 if (TREE_CODE (type
) == METHOD_TYPE
)
8784 tree parm
= build_this_parm (decl
, type
, quals
);
8785 DECL_CHAIN (parm
) = parms
;
8788 /* Allocate space to hold the vptr bit if needed. */
8789 SET_DECL_ALIGN (decl
, MINIMUM_METHOD_BOUNDARY
);
8792 DECL_ARGUMENTS (decl
) = parms
;
8793 for (t
= parms
; t
; t
= DECL_CHAIN (t
))
8794 DECL_CONTEXT (t
) = decl
;
8796 /* Propagate volatile out from type to decl. */
8797 if (TYPE_VOLATILE (type
))
8798 TREE_THIS_VOLATILE (decl
) = 1;
8800 /* Setup decl according to sfk. */
8803 case sfk_constructor
:
8804 case sfk_copy_constructor
:
8805 case sfk_move_constructor
:
8806 DECL_CXX_CONSTRUCTOR_P (decl
) = 1;
8807 DECL_NAME (decl
) = ctor_identifier
;
8809 case sfk_destructor
:
8810 DECL_CXX_DESTRUCTOR_P (decl
) = 1;
8811 DECL_NAME (decl
) = dtor_identifier
;
8817 if (friendp
&& TREE_CODE (orig_declarator
) == TEMPLATE_ID_EXPR
)
8821 "defining explicit specialization %qD in friend declaration",
8825 tree fns
= TREE_OPERAND (orig_declarator
, 0);
8826 tree args
= TREE_OPERAND (orig_declarator
, 1);
8828 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
8830 /* Something like `template <class T> friend void f<T>()'. */
8832 "invalid use of template-id %qD in declaration "
8833 "of primary template",
8839 /* A friend declaration of the form friend void f<>(). Record
8840 the information in the TEMPLATE_ID_EXPR. */
8841 SET_DECL_IMPLICIT_INSTANTIATION (decl
);
8843 gcc_assert (identifier_p (fns
) || TREE_CODE (fns
) == OVERLOAD
);
8844 DECL_TEMPLATE_INFO (decl
) = build_template_info (fns
, args
);
8846 for (t
= TYPE_ARG_TYPES (TREE_TYPE (decl
)); t
; t
= TREE_CHAIN (t
))
8847 if (TREE_PURPOSE (t
)
8848 && TREE_CODE (TREE_PURPOSE (t
)) == DEFAULT_ARG
)
8850 error_at (defarg_location (TREE_PURPOSE (t
)),
8851 "default arguments are not allowed in declaration "
8852 "of friend template specialization %qD",
8859 error_at (declspecs
->locations
[ds_inline
],
8860 "%<inline%> is not allowed in declaration of friend "
8861 "template specialization %qD",
8868 /* C++17 11.3.6/4: "If a friend declaration specifies a default argument
8869 expression, that declaration shall be a definition..." */
8870 if (friendp
&& !funcdef_flag
)
8872 for (tree t
= FUNCTION_FIRST_USER_PARMTYPE (decl
);
8873 t
&& t
!= void_list_node
; t
= TREE_CHAIN (t
))
8874 if (TREE_PURPOSE (t
))
8876 permerror (DECL_SOURCE_LOCATION (decl
),
8877 "friend declaration of %qD specifies default "
8878 "arguments and isn't a definition", decl
);
8883 /* If this decl has namespace scope, set that up. */
8885 set_decl_namespace (decl
, in_namespace
, friendp
);
8887 DECL_CONTEXT (decl
) = FROB_CONTEXT (current_decl_namespace ());
8889 /* `main' and builtins have implicit 'C' linkage. */
8890 if (ctype
== NULL_TREE
8891 && DECL_FILE_SCOPE_P (decl
)
8892 && current_lang_name
== lang_name_cplusplus
8893 && (MAIN_NAME_P (declarator
)
8894 || (IDENTIFIER_LENGTH (declarator
) > 10
8895 && IDENTIFIER_POINTER (declarator
)[0] == '_'
8896 && IDENTIFIER_POINTER (declarator
)[1] == '_'
8897 && strncmp (IDENTIFIER_POINTER (declarator
)+2,
8898 "builtin_", 8) == 0)
8899 || (targetcm
.cxx_implicit_extern_c
8900 && (targetcm
.cxx_implicit_extern_c
8901 (IDENTIFIER_POINTER (declarator
))))))
8902 SET_DECL_LANGUAGE (decl
, lang_c
);
8904 /* Should probably propagate const out from type to decl I bet (mrs). */
8907 DECL_STATIC_FUNCTION_P (decl
) = 1;
8908 DECL_CONTEXT (decl
) = ctype
;
8912 DECL_DELETED_FN (decl
) = 1;
8916 DECL_CONTEXT (decl
) = ctype
;
8918 check_class_member_definition_namespace (decl
);
8921 if (ctype
== NULL_TREE
&& DECL_MAIN_P (decl
))
8923 if (PROCESSING_REAL_TEMPLATE_DECL_P())
8924 error_at (location
, "cannot declare %<::main%> to be a template");
8926 error_at (declspecs
->locations
[ds_inline
],
8927 "cannot declare %<::main%> to be inline");
8929 error_at (declspecs
->locations
[ds_constexpr
],
8930 "cannot declare %<::main%> to be %<constexpr%>");
8932 error_at (location
, "cannot declare %<::main%> to be static");
8937 /* Members of anonymous types and local classes have no linkage; make
8938 them internal. If a typedef is made later, this will be changed. */
8939 if (ctype
&& (!TREE_PUBLIC (TYPE_MAIN_DECL (ctype
))
8940 || decl_function_context (TYPE_MAIN_DECL (ctype
))))
8943 if (publicp
&& cxx_dialect
== cxx98
)
8945 /* [basic.link]: A name with no linkage (notably, the name of a class
8946 or enumeration declared in a local scope) shall not be used to
8947 declare an entity with linkage.
8949 DR 757 relaxes this restriction for C++0x. */
8950 no_linkage_error (decl
);
8953 TREE_PUBLIC (decl
) = publicp
;
8956 DECL_INTERFACE_KNOWN (decl
) = 1;
8957 DECL_NOT_REALLY_EXTERN (decl
) = 1;
8960 /* If the declaration was declared inline, mark it as such. */
8963 DECL_DECLARED_INLINE_P (decl
) = 1;
8965 DECL_COMDAT (decl
) = 1;
8968 DECL_DECLARED_CONSTEXPR_P (decl
) = true;
8970 // If the concept declaration specifier was found, check
8971 // that the declaration satisfies the necessary requirements.
8974 DECL_DECLARED_CONCEPT_P (decl
) = true;
8975 check_concept_fn (decl
);
8978 DECL_EXTERNAL (decl
) = 1;
8979 if (TREE_CODE (type
) == FUNCTION_TYPE
)
8982 TREE_TYPE (decl
) = apply_memfn_quals (TREE_TYPE (decl
),
8989 ? G_("static member function %qD cannot have cv-qualifier")
8990 : G_("non-member function %qD cannot have cv-qualifier"),
8992 quals
= TYPE_UNQUALIFIED
;
8998 ? G_("static member function %qD cannot have ref-qualifier")
8999 : G_("non-member function %qD cannot have ref-qualifier"),
9001 rqual
= REF_QUAL_NONE
;
9005 if (deduction_guide_p (decl
))
9007 if (!DECL_NAMESPACE_SCOPE_P (decl
))
9009 error_at (location
, "deduction guide %qD must be declared at "
9010 "namespace scope", decl
);
9015 "deduction guide %qD must not have a function body", decl
);
9017 else if (IDENTIFIER_ANY_OP_P (DECL_NAME (decl
))
9018 && !grok_op_properties (decl
, /*complain=*/true))
9020 else if (UDLIT_OPER_P (DECL_NAME (decl
)))
9022 bool long_long_unsigned_p
;
9024 const char *suffix
= NULL
;
9025 /* [over.literal]/6: Literal operators shall not have C linkage. */
9026 if (DECL_LANGUAGE (decl
) == lang_c
)
9028 error_at (location
, "literal operator with C linkage");
9029 maybe_show_extern_c_location ();
9033 if (DECL_NAMESPACE_SCOPE_P (decl
))
9035 if (!check_literal_operator_args (decl
, &long_long_unsigned_p
,
9038 error_at (location
, "%qD has invalid argument list", decl
);
9042 suffix
= UDLIT_OP_SUFFIX (DECL_NAME (decl
));
9043 if (long_long_unsigned_p
)
9045 if (cpp_interpret_int_suffix (parse_in
, suffix
, strlen (suffix
)))
9046 warning_at (location
, 0, "integer suffix %qs"
9047 " shadowed by implementation", suffix
);
9049 else if (long_double_p
)
9051 if (cpp_interpret_float_suffix (parse_in
, suffix
, strlen (suffix
)))
9052 warning_at (location
, 0, "floating point suffix %qs"
9053 " shadowed by implementation", suffix
);
9056 if (suffix
[0] != '_'
9057 && !in_system_header_at (location
)
9058 && !current_function_decl
&& !(friendp
&& !funcdef_flag
))
9059 warning_at (location
, OPT_Wliteral_suffix
,
9060 "literal operator suffixes not preceded by %<_%>"
9061 " are reserved for future standardization");
9065 error_at (location
, "%qD must be a non-member function", decl
);
9071 /* Make the init_value nonzero so pushdecl knows this is not
9072 tentative. error_mark_node is replaced later with the BLOCK. */
9073 DECL_INITIAL (decl
) = error_mark_node
;
9075 if (TYPE_NOTHROW_P (type
) || nothrow_libfn_p (decl
))
9076 TREE_NOTHROW (decl
) = 1;
9078 if (flag_openmp
|| flag_openmp_simd
)
9080 /* Adjust "omp declare simd" attributes. */
9081 tree ods
= lookup_attribute ("omp declare simd", *attrlist
);
9085 for (attr
= ods
; attr
;
9086 attr
= lookup_attribute ("omp declare simd", TREE_CHAIN (attr
)))
9088 if (TREE_CODE (type
) == METHOD_TYPE
)
9089 walk_tree (&TREE_VALUE (attr
), declare_simd_adjust_this
,
9090 DECL_ARGUMENTS (decl
), NULL
);
9091 if (TREE_VALUE (attr
) != NULL_TREE
)
9093 tree cl
= TREE_VALUE (TREE_VALUE (attr
));
9094 cl
= c_omp_declare_simd_clauses_to_numbers
9095 (DECL_ARGUMENTS (decl
), cl
);
9097 TREE_VALUE (TREE_VALUE (attr
)) = cl
;
9099 TREE_VALUE (attr
) = NULL_TREE
;
9105 /* Caller will do the rest of this. */
9109 if (ctype
!= NULL_TREE
)
9110 grokclassfn (ctype
, decl
, flags
);
9113 if (cxx_dialect
>= cxx11
9114 && DECL_DESTRUCTOR_P (decl
)
9115 && !TYPE_BEING_DEFINED (DECL_CONTEXT (decl
))
9116 && !processing_template_decl
)
9117 deduce_noexcept_on_destructor (decl
);
9119 decl
= check_explicit_specialization (orig_declarator
, decl
,
9122 4 * (friendp
!= 0) +
9125 if (decl
== error_mark_node
)
9128 if (DECL_STATIC_FUNCTION_P (decl
))
9129 check_static_quals (decl
, quals
);
9133 cplus_decl_attributes (&decl
, *attrlist
, 0);
9134 *attrlist
= NULL_TREE
;
9137 /* Check main's type after attributes have been applied. */
9138 if (ctype
== NULL_TREE
&& DECL_MAIN_P (decl
))
9140 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl
)),
9143 tree oldtypeargs
= TYPE_ARG_TYPES (TREE_TYPE (decl
));
9145 error_at (declspecs
->locations
[ds_type_spec
],
9146 "%<::main%> must return %<int%>");
9147 newtype
= build_function_type (integer_type_node
, oldtypeargs
);
9148 TREE_TYPE (decl
) = newtype
;
9151 check_main_parameter_types (decl
);
9154 if (ctype
!= NULL_TREE
&& check
)
9156 tree old_decl
= check_classfn (ctype
, decl
,
9157 (processing_template_decl
9158 > template_class_depth (ctype
))
9159 ? current_template_parms
9162 if (old_decl
== error_mark_node
)
9170 if (TREE_CODE (old_decl
) == TEMPLATE_DECL
)
9171 /* Because grokfndecl is always supposed to return a
9172 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
9173 here. We depend on our callers to figure out that its
9174 really a template that's being returned. */
9175 old_decl
= DECL_TEMPLATE_RESULT (old_decl
);
9177 if (DECL_STATIC_FUNCTION_P (old_decl
)
9178 && TREE_CODE (TREE_TYPE (decl
)) == METHOD_TYPE
)
9180 /* Remove the `this' parm added by grokclassfn. */
9181 revert_static_member_fn (decl
);
9182 check_static_quals (decl
, quals
);
9184 if (DECL_ARTIFICIAL (old_decl
))
9186 error ("definition of implicitly-declared %qD", old_decl
);
9189 else if (DECL_DEFAULTED_FN (old_decl
))
9191 error ("definition of explicitly-defaulted %q+D", decl
);
9192 inform (DECL_SOURCE_LOCATION (old_decl
),
9193 "%q#D explicitly defaulted here", old_decl
);
9197 /* Since we've smashed OLD_DECL to its
9198 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
9199 if (TREE_CODE (decl
) == TEMPLATE_DECL
)
9200 decl
= DECL_TEMPLATE_RESULT (decl
);
9202 /* Attempt to merge the declarations. This can fail, in
9203 the case of some invalid specialization declarations. */
9204 pushed_scope
= push_scope (ctype
);
9205 ok
= duplicate_decls (decl
, old_decl
, friendp
);
9207 pop_scope (pushed_scope
);
9210 error ("no %q#D member function declared in class %qT",
9214 if (ok
== error_mark_node
)
9220 if (DECL_CONSTRUCTOR_P (decl
) && !grok_ctor_properties (ctype
, decl
))
9223 if (ctype
== NULL_TREE
|| check
)
9227 DECL_VIRTUAL_P (decl
) = 1;
9232 /* decl is a FUNCTION_DECL.
9233 specifiers are the parsed virt-specifiers.
9235 Set flags to reflect the virt-specifiers.
9240 set_virt_specifiers (tree decl
, cp_virt_specifiers specifiers
)
9242 if (decl
== NULL_TREE
)
9244 if (specifiers
& VIRT_SPEC_OVERRIDE
)
9245 DECL_OVERRIDE_P (decl
) = 1;
9246 if (specifiers
& VIRT_SPEC_FINAL
)
9247 DECL_FINAL_P (decl
) = 1;
9251 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
9252 the linkage that DECL will receive in the object file. */
9255 set_linkage_for_static_data_member (tree decl
)
9257 /* A static data member always has static storage duration and
9258 external linkage. Note that static data members are forbidden in
9259 local classes -- the only situation in which a class has
9260 non-external linkage. */
9261 TREE_PUBLIC (decl
) = 1;
9262 TREE_STATIC (decl
) = 1;
9263 /* For non-template classes, static data members are always put
9264 out in exactly those files where they are defined, just as
9265 with ordinary namespace-scope variables. */
9266 if (!processing_template_decl
)
9267 DECL_INTERFACE_KNOWN (decl
) = 1;
9270 /* Create a VAR_DECL named NAME with the indicated TYPE.
9272 If SCOPE is non-NULL, it is the class type or namespace containing
9273 the variable. If SCOPE is NULL, the variable should is created in
9274 the innermost enclosing scope. */
9277 grokvardecl (tree type
,
9279 tree orig_declarator
,
9280 const cp_decl_specifier_seq
*declspecs
,
9289 tree explicit_scope
;
9291 gcc_assert (!name
|| identifier_p (name
));
9293 bool constp
= (type_quals
& TYPE_QUAL_CONST
) != 0;
9294 bool volatilep
= (type_quals
& TYPE_QUAL_VOLATILE
) != 0;
9296 /* Compute the scope in which to place the variable, but remember
9297 whether or not that scope was explicitly specified by the user. */
9298 explicit_scope
= scope
;
9301 /* An explicit "extern" specifier indicates a namespace-scope
9303 if (declspecs
->storage_class
== sc_extern
)
9304 scope
= current_decl_namespace ();
9305 else if (!at_function_scope_p ())
9306 scope
= current_scope ();
9310 && (/* If the variable is a namespace-scope variable declared in a
9311 template, we need DECL_LANG_SPECIFIC. */
9312 (TREE_CODE (scope
) == NAMESPACE_DECL
&& processing_template_decl
)
9313 /* Similarly for namespace-scope variables with language linkage
9315 || (TREE_CODE (scope
) == NAMESPACE_DECL
9316 && current_lang_name
!= lang_name_cplusplus
)
9317 /* Similarly for static data members. */
9319 /* Similarly for explicit specializations. */
9321 && TREE_CODE (orig_declarator
) == TEMPLATE_ID_EXPR
)))
9322 decl
= build_lang_decl (VAR_DECL
, name
, type
);
9324 decl
= build_decl (input_location
, VAR_DECL
, name
, type
);
9326 if (explicit_scope
&& TREE_CODE (explicit_scope
) == NAMESPACE_DECL
)
9327 set_decl_namespace (decl
, explicit_scope
, 0);
9329 DECL_CONTEXT (decl
) = FROB_CONTEXT (scope
);
9331 if (declspecs
->storage_class
== sc_extern
)
9333 DECL_THIS_EXTERN (decl
) = 1;
9334 DECL_EXTERNAL (decl
) = !initialized
;
9337 if (DECL_CLASS_SCOPE_P (decl
))
9339 set_linkage_for_static_data_member (decl
);
9340 /* This function is only called with out-of-class definitions. */
9341 DECL_EXTERNAL (decl
) = 0;
9342 check_class_member_definition_namespace (decl
);
9344 /* At top level, either `static' or no s.c. makes a definition
9345 (perhaps tentative), and absence of `static' makes it public. */
9346 else if (toplevel_bindings_p ())
9348 TREE_PUBLIC (decl
) = (declspecs
->storage_class
!= sc_static
9349 && (DECL_THIS_EXTERN (decl
)
9353 TREE_STATIC (decl
) = ! DECL_EXTERNAL (decl
);
9355 /* Not at top level, only `static' makes a static definition. */
9358 TREE_STATIC (decl
) = declspecs
->storage_class
== sc_static
;
9359 TREE_PUBLIC (decl
) = DECL_EXTERNAL (decl
);
9362 if (decl_spec_seq_has_spec_p (declspecs
, ds_thread
))
9364 if (DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
9366 CP_DECL_THREAD_LOCAL_P (decl
) = true;
9367 if (!processing_template_decl
)
9368 set_decl_tls_model (decl
, decl_default_tls_model (decl
));
9370 if (declspecs
->gnu_thread_keyword_p
)
9371 SET_DECL_GNU_TLS_P (decl
);
9374 /* If the type of the decl has no linkage, make sure that we'll
9375 notice that in mark_used. */
9376 if (cxx_dialect
> cxx98
9377 && decl_linkage (decl
) != lk_none
9378 && DECL_LANG_SPECIFIC (decl
) == NULL
9379 && !DECL_EXTERN_C_P (decl
)
9380 && no_linkage_check (TREE_TYPE (decl
), /*relaxed_p=*/false))
9381 retrofit_lang_decl (decl
);
9383 if (TREE_PUBLIC (decl
))
9385 /* [basic.link]: A name with no linkage (notably, the name of a class
9386 or enumeration declared in a local scope) shall not be used to
9387 declare an entity with linkage.
9389 DR 757 relaxes this restriction for C++0x. */
9390 if (cxx_dialect
< cxx11
)
9391 no_linkage_error (decl
);
9394 DECL_INTERFACE_KNOWN (decl
) = 1;
9396 if (DECL_NAME (decl
)
9397 && MAIN_NAME_P (DECL_NAME (decl
))
9398 && scope
== global_namespace
)
9399 error ("cannot declare %<::main%> to be a global variable");
9401 /* Check that the variable can be safely declared as a concept.
9402 Note that this also forbids explicit specializations. */
9405 if (!processing_template_decl
)
9407 error_at (declspecs
->locations
[ds_concept
],
9408 "a non-template variable cannot be %<concept%>");
9412 DECL_DECLARED_CONCEPT_P (decl
) = true;
9413 if (!same_type_ignoring_top_level_qualifiers_p (type
, boolean_type_node
))
9414 error_at (declspecs
->locations
[ds_type_spec
],
9415 "concept must have type %<bool%>");
9417 else if (flag_concepts
9418 && processing_template_decl
> template_class_depth (scope
))
9420 tree reqs
= TEMPLATE_PARMS_CONSTRAINTS (current_template_parms
);
9421 tree ci
= build_constraints (reqs
, NULL_TREE
);
9422 set_constraints (decl
, ci
);
9425 // Handle explicit specializations and instantiations of variable templates.
9426 if (orig_declarator
)
9427 decl
= check_explicit_specialization (orig_declarator
, decl
,
9428 template_count
, conceptp
* 8);
9430 return decl
!= error_mark_node
? decl
: NULL_TREE
;
9433 /* Create and return a canonical pointer to member function type, for
9434 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
9437 build_ptrmemfunc_type (tree type
)
9442 if (type
== error_mark_node
)
9445 /* Make sure that we always have the unqualified pointer-to-member
9447 if (cp_cv_quals quals
= cp_type_quals (type
))
9449 tree unqual
= build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type
));
9450 return cp_build_qualified_type (unqual
, quals
);
9453 /* If a canonical type already exists for this type, use it. We use
9454 this method instead of type_hash_canon, because it only does a
9455 simple equality check on the list of field members. */
9457 t
= TYPE_PTRMEMFUNC_TYPE (type
);
9461 t
= make_node (RECORD_TYPE
);
9463 /* Let the front end know this is a pointer to member function. */
9464 TYPE_PTRMEMFUNC_FLAG (t
) = 1;
9466 field
= build_decl (input_location
, FIELD_DECL
, pfn_identifier
, type
);
9469 field
= build_decl (input_location
, FIELD_DECL
, delta_identifier
,
9471 DECL_CHAIN (field
) = fields
;
9474 finish_builtin_struct (t
, "__ptrmemfunc_type", fields
, ptr_type_node
);
9476 /* Zap out the name so that the back end will give us the debugging
9477 information for this anonymous RECORD_TYPE. */
9478 TYPE_NAME (t
) = NULL_TREE
;
9480 /* Cache this pointer-to-member type so that we can find it again
9482 TYPE_PTRMEMFUNC_TYPE (type
) = t
;
9484 if (TYPE_STRUCTURAL_EQUALITY_P (type
))
9485 SET_TYPE_STRUCTURAL_EQUALITY (t
);
9486 else if (TYPE_CANONICAL (type
) != type
)
9487 TYPE_CANONICAL (t
) = build_ptrmemfunc_type (TYPE_CANONICAL (type
));
9492 /* Create and return a pointer to data member type. */
9495 build_ptrmem_type (tree class_type
, tree member_type
)
9497 if (TREE_CODE (member_type
) == METHOD_TYPE
)
9499 cp_cv_quals quals
= type_memfn_quals (member_type
);
9500 cp_ref_qualifier rqual
= type_memfn_rqual (member_type
);
9501 member_type
= build_memfn_type (member_type
, class_type
, quals
, rqual
);
9502 return build_ptrmemfunc_type (build_pointer_type (member_type
));
9506 gcc_assert (TREE_CODE (member_type
) != FUNCTION_TYPE
);
9507 return build_offset_type (class_type
, member_type
);
9511 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
9512 Check to see that the definition is valid. Issue appropriate error
9516 check_static_variable_definition (tree decl
, tree type
)
9518 /* Avoid redundant diagnostics on out-of-class definitions. */
9519 if (!current_class_type
|| !TYPE_BEING_DEFINED (current_class_type
))
9521 /* Can't check yet if we don't know the type. */
9522 else if (dependent_type_p (type
))
9524 /* If DECL is declared constexpr, we'll do the appropriate checks
9525 in check_initializer. Similarly for inline static data members. */
9526 else if (DECL_P (decl
)
9527 && (DECL_DECLARED_CONSTEXPR_P (decl
)
9528 || undeduced_auto_decl (decl
)
9529 || DECL_VAR_DECLARED_INLINE_P (decl
)))
9531 else if (cxx_dialect
>= cxx11
&& !INTEGRAL_OR_ENUMERATION_TYPE_P (type
))
9533 if (!COMPLETE_TYPE_P (type
))
9534 error_at (DECL_SOURCE_LOCATION (decl
),
9535 "in-class initialization of static data member %q#D of "
9536 "incomplete type", decl
);
9537 else if (literal_type_p (type
))
9538 permerror (DECL_SOURCE_LOCATION (decl
),
9539 "%<constexpr%> needed for in-class initialization of "
9540 "static data member %q#D of non-integral type", decl
);
9542 error_at (DECL_SOURCE_LOCATION (decl
),
9543 "in-class initialization of static data member %q#D of "
9544 "non-literal type", decl
);
9546 /* Motion 10 at San Diego: If a static const integral data member is
9547 initialized with an integral constant expression, the initializer
9548 may appear either in the declaration (within the class), or in
9549 the definition, but not both. If it appears in the class, the
9550 member is a member constant. The file-scope definition is always
9552 else if (!ARITHMETIC_TYPE_P (type
) && TREE_CODE (type
) != ENUMERAL_TYPE
)
9553 error_at (DECL_SOURCE_LOCATION (decl
),
9554 "invalid in-class initialization of static data member "
9555 "of non-integral type %qT",
9557 else if (!CP_TYPE_CONST_P (type
))
9558 error_at (DECL_SOURCE_LOCATION (decl
),
9559 "ISO C++ forbids in-class initialization of non-const "
9560 "static member %qD",
9562 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type
))
9563 pedwarn (DECL_SOURCE_LOCATION (decl
), OPT_Wpedantic
,
9564 "ISO C++ forbids initialization of member constant "
9565 "%qD of non-integral type %qT", decl
, type
);
9568 /* *expr_p is part of the TYPE_SIZE of a variably-sized array. If any
9569 SAVE_EXPRs in *expr_p wrap expressions with side-effects, break those
9570 expressions out into temporary variables so that walk_tree doesn't
9571 step into them (c++/15764). */
9574 stabilize_save_expr_r (tree
*expr_p
, int *walk_subtrees
, void *data
)
9576 hash_set
<tree
> *pset
= (hash_set
<tree
> *)data
;
9577 tree expr
= *expr_p
;
9578 if (TREE_CODE (expr
) == SAVE_EXPR
)
9580 tree op
= TREE_OPERAND (expr
, 0);
9581 cp_walk_tree (&op
, stabilize_save_expr_r
, data
, pset
);
9582 if (TREE_SIDE_EFFECTS (op
))
9583 TREE_OPERAND (expr
, 0) = get_temp_regvar (TREE_TYPE (op
), op
);
9586 else if (!EXPR_P (expr
) || !TREE_SIDE_EFFECTS (expr
))
9591 /* Entry point for the above. */
9594 stabilize_vla_size (tree size
)
9596 hash_set
<tree
> pset
;
9597 /* Break out any function calls into temporary variables. */
9598 cp_walk_tree (&size
, stabilize_save_expr_r
, &pset
, &pset
);
9601 /* Reduce a SIZEOF_EXPR to its value. */
9604 fold_sizeof_expr (tree t
)
9607 if (SIZEOF_EXPR_TYPE_P (t
))
9608 r
= cxx_sizeof_or_alignof_type (TREE_TYPE (TREE_OPERAND (t
, 0)),
9609 SIZEOF_EXPR
, false, false);
9610 else if (TYPE_P (TREE_OPERAND (t
, 0)))
9611 r
= cxx_sizeof_or_alignof_type (TREE_OPERAND (t
, 0), SIZEOF_EXPR
,
9614 r
= cxx_sizeof_or_alignof_expr (TREE_OPERAND (t
, 0), SIZEOF_EXPR
,
9616 if (r
== error_mark_node
)
9621 /* Given the SIZE (i.e., number of elements) in an array, compute
9622 an appropriate index type for the array. If non-NULL, NAME is
9623 the name of the entity being declared. */
9626 compute_array_index_type (tree name
, tree size
, tsubst_flags_t complain
)
9631 if (error_operand_p (size
))
9632 return error_mark_node
;
9634 if (!type_dependent_expression_p (size
))
9636 osize
= size
= mark_rvalue_use (size
);
9638 if (cxx_dialect
< cxx11
&& TREE_CODE (size
) == NOP_EXPR
9639 && TREE_SIDE_EFFECTS (size
))
9640 /* In C++98, we mark a non-constant array bound with a magic
9641 NOP_EXPR with TREE_SIDE_EFFECTS; don't fold in that case. */;
9644 size
= instantiate_non_dependent_expr_sfinae (size
, complain
);
9645 size
= build_converted_constant_expr (size_type_node
, size
, complain
);
9646 size
= maybe_constant_value (size
);
9648 if (!TREE_CONSTANT (size
))
9652 if (error_operand_p (size
))
9653 return error_mark_node
;
9655 /* The array bound must be an integer type. */
9656 tree type
= TREE_TYPE (size
);
9657 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type
))
9659 if (!(complain
& tf_error
))
9660 return error_mark_node
;
9662 error ("size of array %qD has non-integral type %qT", name
, type
);
9664 error ("size of array has non-integral type %qT", type
);
9665 size
= integer_one_node
;
9669 /* A type is dependent if it is...an array type constructed from any
9670 dependent type or whose size is specified by a constant expression
9671 that is value-dependent. */
9672 /* We can only call value_dependent_expression_p on integral constant
9673 expressions; treat non-constant expressions as dependent, too. */
9674 if (processing_template_decl
9675 && (type_dependent_expression_p (size
)
9676 || !TREE_CONSTANT (size
) || value_dependent_expression_p (size
)))
9678 /* We cannot do any checking for a SIZE that isn't known to be
9679 constant. Just build the index type and mark that it requires
9680 structural equality checks. */
9681 itype
= build_index_type (build_min (MINUS_EXPR
, sizetype
,
9682 size
, size_one_node
));
9683 TYPE_DEPENDENT_P (itype
) = 1;
9684 TYPE_DEPENDENT_P_VALID (itype
) = 1;
9685 SET_TYPE_STRUCTURAL_EQUALITY (itype
);
9689 if (TREE_CODE (size
) != INTEGER_CST
)
9691 tree folded
= cp_fully_fold (size
);
9692 if (TREE_CODE (folded
) == INTEGER_CST
)
9693 pedwarn (input_location
, OPT_Wpedantic
,
9694 "size of array is not an integral constant-expression");
9695 /* Use the folded result for VLAs, too; it will have resolved
9700 /* Normally, the array-bound will be a constant. */
9701 if (TREE_CODE (size
) == INTEGER_CST
)
9703 /* An array must have a positive number of elements. */
9704 if (!valid_constant_size_p (size
))
9706 if (!(complain
& tf_error
))
9707 return error_mark_node
;
9710 error ("size of array %qD is negative", name
);
9712 error ("size of array is negative");
9713 size
= integer_one_node
;
9715 /* As an extension we allow zero-sized arrays. */
9716 else if (integer_zerop (size
))
9718 if (!(complain
& tf_error
))
9719 /* We must fail if performing argument deduction (as
9720 indicated by the state of complain), so that
9721 another substitution can be found. */
9722 return error_mark_node
;
9723 else if (in_system_header_at (input_location
))
9724 /* Allow them in system headers because glibc uses them. */;
9726 pedwarn (input_location
, OPT_Wpedantic
, "ISO C++ forbids zero-size array %qD", name
);
9728 pedwarn (input_location
, OPT_Wpedantic
, "ISO C++ forbids zero-size array");
9731 else if (TREE_CONSTANT (size
)
9732 /* We don't allow VLAs at non-function scopes, or during
9733 tentative template substitution. */
9734 || !at_function_scope_p ()
9735 || !(complain
& tf_error
))
9737 if (!(complain
& tf_error
))
9738 return error_mark_node
;
9739 /* `(int) &fn' is not a valid array bound. */
9741 error ("size of array %qD is not an integral constant-expression",
9744 error ("size of array is not an integral constant-expression");
9745 size
= integer_one_node
;
9747 else if (pedantic
&& warn_vla
!= 0)
9750 pedwarn (input_location
, OPT_Wvla
, "ISO C++ forbids variable length array %qD", name
);
9752 pedwarn (input_location
, OPT_Wvla
, "ISO C++ forbids variable length array");
9754 else if (warn_vla
> 0)
9758 "variable length array %qD is used", name
);
9761 "variable length array is used");
9764 if (processing_template_decl
&& !TREE_CONSTANT (size
))
9765 /* A variable sized array. */
9766 itype
= build_min (MINUS_EXPR
, sizetype
, size
, integer_one_node
);
9769 /* Compute the index of the largest element in the array. It is
9770 one less than the number of elements in the array. We save
9771 and restore PROCESSING_TEMPLATE_DECL so that computations in
9772 cp_build_binary_op will be appropriately folded. */
9774 processing_template_decl_sentinel s
;
9775 itype
= cp_build_binary_op (input_location
,
9777 cp_convert (ssizetype
, size
, complain
),
9778 cp_convert (ssizetype
, integer_one_node
,
9781 itype
= maybe_constant_value (itype
);
9784 if (!TREE_CONSTANT (itype
))
9786 /* A variable sized array. */
9787 itype
= variable_size (itype
);
9789 stabilize_vla_size (itype
);
9791 if (sanitize_flags_p (SANITIZE_VLA
)
9792 && current_function_decl
!= NULL_TREE
)
9794 /* We have to add 1 -- in the ubsan routine we generate
9795 LE_EXPR rather than LT_EXPR. */
9796 tree t
= fold_build2 (PLUS_EXPR
, TREE_TYPE (itype
), itype
,
9797 build_one_cst (TREE_TYPE (itype
)));
9798 t
= ubsan_instrument_vla (input_location
, t
);
9799 finish_expr_stmt (t
);
9802 /* Make sure that there was no overflow when creating to a signed
9803 index type. (For example, on a 32-bit machine, an array with
9804 size 2^32 - 1 is too big.) */
9805 else if (TREE_CODE (itype
) == INTEGER_CST
9806 && TREE_OVERFLOW (itype
))
9808 if (!(complain
& tf_error
))
9809 return error_mark_node
;
9810 error ("overflow in array dimension");
9811 TREE_OVERFLOW (itype
) = 0;
9815 /* Create and return the appropriate index type. */
9816 itype
= build_index_type (itype
);
9818 /* If the index type were dependent, we would have returned early, so
9819 remember that it isn't. */
9820 TYPE_DEPENDENT_P (itype
) = 0;
9821 TYPE_DEPENDENT_P_VALID (itype
) = 1;
9825 /* Returns the scope (if any) in which the entity declared by
9826 DECLARATOR will be located. If the entity was declared with an
9827 unqualified name, NULL_TREE is returned. */
9830 get_scope_of_declarator (const cp_declarator
*declarator
)
9832 while (declarator
&& declarator
->kind
!= cdk_id
)
9833 declarator
= declarator
->declarator
;
9835 /* If the declarator-id is a SCOPE_REF, the scope in which the
9836 declaration occurs is the first operand. */
9838 && declarator
->u
.id
.qualifying_scope
)
9839 return declarator
->u
.id
.qualifying_scope
;
9841 /* Otherwise, the declarator is not a qualified name; the entity will
9842 be declared in the current scope. */
9846 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
9847 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
9851 create_array_type_for_decl (tree name
, tree type
, tree size
, location_t loc
)
9853 tree itype
= NULL_TREE
;
9855 /* If things have already gone awry, bail now. */
9856 if (type
== error_mark_node
|| size
== error_mark_node
)
9857 return error_mark_node
;
9859 /* 8.3.4/1: If the type of the identifier of D contains the auto
9860 type-specifier, the program is ill-formed. */
9861 if (type_uses_auto (type
))
9864 error_at (loc
, "%qD declared as array of %qT", name
, type
);
9866 error ("creating array of %qT", type
);
9867 return error_mark_node
;
9870 /* If there are some types which cannot be array elements,
9871 issue an error-message and return. */
9872 switch (TREE_CODE (type
))
9876 error_at (loc
, "declaration of %qD as array of void", name
);
9878 error ("creating array of void");
9879 return error_mark_node
;
9883 error_at (loc
, "declaration of %qD as array of functions", name
);
9885 error ("creating array of functions");
9886 return error_mark_node
;
9888 case REFERENCE_TYPE
:
9890 error_at (loc
, "declaration of %qD as array of references", name
);
9892 error ("creating array of references");
9893 return error_mark_node
;
9897 error_at (loc
, "declaration of %qD as array of function members",
9900 error ("creating array of function members");
9901 return error_mark_node
;
9909 The constant expressions that specify the bounds of the arrays
9910 can be omitted only for the first member of the sequence. */
9911 if (TREE_CODE (type
) == ARRAY_TYPE
&& !TYPE_DOMAIN (type
))
9914 error_at (loc
, "declaration of %qD as multidimensional array must "
9915 "have bounds for all dimensions except the first",
9918 error ("multidimensional array must have bounds for all "
9919 "dimensions except the first");
9921 return error_mark_node
;
9924 /* Figure out the index type for the array. */
9926 itype
= compute_array_index_type (name
, size
, tf_warning_or_error
);
9929 T is called the array element type; this type shall not be [...] an
9930 abstract class type. */
9931 abstract_virtuals_error (name
, type
);
9933 return build_cplus_array_type (type
, itype
);
9936 /* Returns the smallest location that is not UNKNOWN_LOCATION. */
9939 min_location (location_t loca
, location_t locb
)
9941 if (loca
== UNKNOWN_LOCATION
9942 || (locb
!= UNKNOWN_LOCATION
9943 && linemap_location_before_p (line_table
, locb
, loca
)))
9948 /* Returns the smallest location != UNKNOWN_LOCATION among the
9949 three stored in LOCATIONS[ds_const], LOCATIONS[ds_volatile],
9950 and LOCATIONS[ds_restrict]. */
9953 smallest_type_quals_location (int type_quals
, const location_t
* locations
)
9955 location_t loc
= UNKNOWN_LOCATION
;
9957 if (type_quals
& TYPE_QUAL_CONST
)
9958 loc
= locations
[ds_const
];
9960 if (type_quals
& TYPE_QUAL_VOLATILE
)
9961 loc
= min_location (loc
, locations
[ds_volatile
]);
9963 if (type_quals
& TYPE_QUAL_RESTRICT
)
9964 loc
= min_location (loc
, locations
[ds_restrict
]);
9969 /* Check that it's OK to declare a function with the indicated TYPE
9970 and TYPE_QUALS. SFK indicates the kind of special function (if any)
9971 that this function is. OPTYPE is the type given in a conversion
9972 operator declaration, or the class type for a constructor/destructor.
9973 Returns the actual return type of the function; that may be different
9974 than TYPE if an error occurs, or for certain special functions. */
9977 check_special_function_return_type (special_function_kind sfk
,
9981 const location_t
* locations
)
9985 case sfk_constructor
:
9987 error ("return type specification for constructor invalid");
9988 else if (type_quals
!= TYPE_UNQUALIFIED
)
9989 error_at (smallest_type_quals_location (type_quals
, locations
),
9990 "qualifiers are not allowed on constructor declaration");
9992 if (targetm
.cxx
.cdtor_returns_this ())
9993 type
= build_pointer_type (optype
);
9995 type
= void_type_node
;
9998 case sfk_destructor
:
10000 error ("return type specification for destructor invalid");
10001 else if (type_quals
!= TYPE_UNQUALIFIED
)
10002 error_at (smallest_type_quals_location (type_quals
, locations
),
10003 "qualifiers are not allowed on destructor declaration");
10005 /* We can't use the proper return type here because we run into
10006 problems with ambiguous bases and covariant returns. */
10007 if (targetm
.cxx
.cdtor_returns_this ())
10008 type
= build_pointer_type (void_type_node
);
10010 type
= void_type_node
;
10013 case sfk_conversion
:
10015 error ("return type specified for %<operator %T%>", optype
);
10016 else if (type_quals
!= TYPE_UNQUALIFIED
)
10017 error_at (smallest_type_quals_location (type_quals
, locations
),
10018 "qualifiers are not allowed on declaration of "
10019 "%<operator %T%>", optype
);
10024 case sfk_deduction_guide
:
10026 error ("return type specified for deduction guide");
10027 else if (type_quals
!= TYPE_UNQUALIFIED
)
10028 error_at (smallest_type_quals_location (type_quals
, locations
),
10029 "qualifiers are not allowed on declaration of "
10030 "deduction guide");
10031 if (TREE_CODE (optype
) == TEMPLATE_TEMPLATE_PARM
)
10033 error ("template template parameter %qT in declaration of "
10034 "deduction guide", optype
);
10035 type
= error_mark_node
;
10038 type
= make_template_placeholder (CLASSTYPE_TI_TEMPLATE (optype
));
10039 for (int i
= 0; i
< ds_last
; ++i
)
10040 if (i
!= ds_explicit
&& locations
[i
])
10041 error_at (locations
[i
],
10042 "decl-specifier in declaration of deduction guide");
10046 gcc_unreachable ();
10052 /* A variable or data member (whose unqualified name is IDENTIFIER)
10053 has been declared with the indicated TYPE. If the TYPE is not
10054 acceptable, issue an error message and return a type to use for
10055 error-recovery purposes. */
10058 check_var_type (tree identifier
, tree type
)
10060 if (VOID_TYPE_P (type
))
10063 error ("unnamed variable or field declared void");
10064 else if (identifier_p (identifier
))
10066 gcc_assert (!IDENTIFIER_ANY_OP_P (identifier
));
10067 error ("variable or field %qE declared void", identifier
);
10070 error ("variable or field declared void");
10071 type
= error_mark_node
;
10077 /* Handle declaring DECL as an inline variable. */
10080 mark_inline_variable (tree decl
, location_t loc
)
10082 bool inlinep
= true;
10083 if (! toplevel_bindings_p ())
10085 error_at (loc
, "%<inline%> specifier invalid for variable "
10086 "%qD declared at block scope", decl
);
10089 else if (cxx_dialect
< cxx17
)
10090 pedwarn (loc
, 0, "inline variables are only available "
10091 "with -std=c++17 or -std=gnu++17");
10094 retrofit_lang_decl (decl
);
10095 SET_DECL_VAR_DECLARED_INLINE_P (decl
);
10100 /* Assign a typedef-given name to a class or enumeration type declared
10101 as anonymous at first. This was split out of grokdeclarator
10102 because it is also used in libcc1. */
10105 name_unnamed_type (tree type
, tree decl
)
10107 gcc_assert (TYPE_UNNAMED_P (type
));
10109 /* Replace the anonymous name with the real name everywhere. */
10110 for (tree t
= TYPE_MAIN_VARIANT (type
); t
; t
= TYPE_NEXT_VARIANT (t
))
10112 if (anon_aggrname_p (TYPE_IDENTIFIER (t
)))
10113 /* We do not rename the debug info representing the
10114 unnamed tagged type because the standard says in
10115 [dcl.typedef] that the naming applies only for
10116 linkage purposes. */
10117 /*debug_hooks->set_name (t, decl);*/
10118 TYPE_NAME (t
) = decl
;
10121 if (TYPE_LANG_SPECIFIC (type
))
10122 TYPE_WAS_UNNAMED (type
) = 1;
10124 /* If this is a typedef within a template class, the nested
10125 type is a (non-primary) template. The name for the
10126 template needs updating as well. */
10127 if (TYPE_LANG_SPECIFIC (type
) && CLASSTYPE_TEMPLATE_INFO (type
))
10128 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type
))
10129 = TYPE_IDENTIFIER (type
);
10131 /* Adjust linkage now that we aren't unnamed anymore. */
10132 reset_type_linkage (type
);
10134 /* FIXME remangle member functions; member functions of a
10135 type with external linkage have external linkage. */
10137 /* Check that our job is done, and that it would fail if we
10138 attempted to do it again. */
10139 gcc_assert (!TYPE_UNNAMED_P (type
));
10142 /* Given declspecs and a declarator (abstract or otherwise), determine
10143 the name and type of the object declared and construct a DECL node
10146 DECLSPECS points to the representation of declaration-specifier
10147 sequence that precedes declarator.
10149 DECL_CONTEXT says which syntactic context this declaration is in:
10150 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
10151 FUNCDEF for a function definition. Like NORMAL but a few different
10152 error messages in each case. Return value may be zero meaning
10153 this definition is too screwy to try to parse.
10154 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
10155 handle member functions (which have FIELD context).
10156 Return value may be zero meaning this definition is too screwy to
10158 PARM for a parameter declaration (either within a function prototype
10159 or before a function body). Make a PARM_DECL, or return void_type_node.
10160 TPARM for a template parameter declaration.
10161 CATCHPARM for a parameter declaration before a catch clause.
10162 TYPENAME if for a typename (in a cast or sizeof).
10163 Don't make a DECL node; just return the ..._TYPE node.
10164 FIELD for a struct or union field; make a FIELD_DECL.
10165 BITFIELD for a field with specified width.
10167 INITIALIZED is as for start_decl.
10169 ATTRLIST is a pointer to the list of attributes, which may be NULL
10170 if there are none; *ATTRLIST may be modified if attributes from inside
10171 the declarator should be applied to the declaration.
10173 When this function is called, scoping variables (such as
10174 CURRENT_CLASS_TYPE) should reflect the scope in which the
10175 declaration occurs, not the scope in which the new declaration will
10176 be placed. For example, on:
10178 void S::f() { ... }
10180 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
10183 Returns a DECL (if a declarator is present), a TYPE (if there is no
10184 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
10188 grokdeclarator (const cp_declarator
*declarator
,
10189 cp_decl_specifier_seq
*declspecs
,
10190 enum decl_context decl_context
,
10194 tree type
= NULL_TREE
;
10196 int explicit_intN
= 0;
10197 int virtualp
, explicitp
, friendp
, inlinep
, staticp
;
10198 int explicit_int
= 0;
10199 int explicit_char
= 0;
10200 int defaulted_int
= 0;
10202 tree typedef_decl
= NULL_TREE
;
10203 const char *name
= NULL
;
10204 tree typedef_type
= NULL_TREE
;
10205 /* True if this declarator is a function definition. */
10206 bool funcdef_flag
= false;
10207 cp_declarator_kind innermost_code
= cdk_error
;
10210 /* See the code below that used this. */
10211 tree decl_attr
= NULL_TREE
;
10214 /* Keep track of what sort of function is being processed
10215 so that we can warn about default return values, or explicit
10216 return values which do not match prescribed defaults. */
10217 special_function_kind sfk
= sfk_none
;
10219 tree dname
= NULL_TREE
;
10220 tree ctor_return_type
= NULL_TREE
;
10221 enum overload_flags flags
= NO_SPECIAL
;
10222 /* cv-qualifiers that apply to the declarator, for a declaration of
10223 a member function. */
10224 cp_cv_quals memfn_quals
= TYPE_UNQUALIFIED
;
10225 /* virt-specifiers that apply to the declarator, for a declaration of
10226 a member function. */
10227 cp_virt_specifiers virt_specifiers
= VIRT_SPEC_UNSPECIFIED
;
10228 /* ref-qualifier that applies to the declarator, for a declaration of
10229 a member function. */
10230 cp_ref_qualifier rqual
= REF_QUAL_NONE
;
10231 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
10232 int type_quals
= TYPE_UNQUALIFIED
;
10233 tree raises
= NULL_TREE
;
10234 int template_count
= 0;
10235 tree returned_attrs
= NULL_TREE
;
10236 tree parms
= NULL_TREE
;
10237 const cp_declarator
*id_declarator
;
10238 /* The unqualified name of the declarator; either an
10239 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
10240 tree unqualified_id
;
10241 /* The class type, if any, in which this entity is located,
10242 or NULL_TREE if none. Note that this value may be different from
10243 the current class type; for example if an attempt is made to declare
10244 "A::f" inside "B", this value will be "A". */
10245 tree ctype
= current_class_type
;
10246 /* The NAMESPACE_DECL for the namespace in which this entity is
10247 located. If an unqualified name is used to declare the entity,
10248 this value will be NULL_TREE, even if the entity is located at
10249 namespace scope. */
10250 tree in_namespace
= NULL_TREE
;
10251 cp_storage_class storage_class
;
10252 bool unsigned_p
, signed_p
, short_p
, long_p
, thread_p
;
10253 bool type_was_error_mark_node
= false;
10254 bool parameter_pack_p
= declarator
? declarator
->parameter_pack_p
: false;
10255 bool template_type_arg
= false;
10256 bool template_parm_flag
= false;
10257 bool typedef_p
= decl_spec_seq_has_spec_p (declspecs
, ds_typedef
);
10258 bool constexpr_p
= decl_spec_seq_has_spec_p (declspecs
, ds_constexpr
);
10259 bool late_return_type_p
= false;
10260 bool array_parameter_p
= false;
10261 source_location saved_loc
= input_location
;
10262 tree reqs
= NULL_TREE
;
10264 signed_p
= decl_spec_seq_has_spec_p (declspecs
, ds_signed
);
10265 unsigned_p
= decl_spec_seq_has_spec_p (declspecs
, ds_unsigned
);
10266 short_p
= decl_spec_seq_has_spec_p (declspecs
, ds_short
);
10267 long_p
= decl_spec_seq_has_spec_p (declspecs
, ds_long
);
10268 longlong
= decl_spec_seq_has_spec_p (declspecs
, ds_long_long
);
10269 explicit_intN
= declspecs
->explicit_intN_p
;
10270 thread_p
= decl_spec_seq_has_spec_p (declspecs
, ds_thread
);
10272 // Was concept_p specified? Note that ds_concept
10273 // implies ds_constexpr!
10274 bool concept_p
= decl_spec_seq_has_spec_p (declspecs
, ds_concept
);
10276 constexpr_p
= true;
10278 if (decl_spec_seq_has_spec_p (declspecs
, ds_const
))
10279 type_quals
|= TYPE_QUAL_CONST
;
10280 if (decl_spec_seq_has_spec_p (declspecs
, ds_volatile
))
10281 type_quals
|= TYPE_QUAL_VOLATILE
;
10282 if (decl_spec_seq_has_spec_p (declspecs
, ds_restrict
))
10283 type_quals
|= TYPE_QUAL_RESTRICT
;
10285 if (decl_context
== FUNCDEF
)
10286 funcdef_flag
= true, decl_context
= NORMAL
;
10287 else if (decl_context
== MEMFUNCDEF
)
10288 funcdef_flag
= true, decl_context
= FIELD
;
10289 else if (decl_context
== BITFIELD
)
10290 bitfield
= 1, decl_context
= FIELD
;
10291 else if (decl_context
== TEMPLATE_TYPE_ARG
)
10292 template_type_arg
= true, decl_context
= TYPENAME
;
10293 else if (decl_context
== TPARM
)
10294 template_parm_flag
= true, decl_context
= PARM
;
10296 if (initialized
> 1)
10297 funcdef_flag
= true;
10299 location_t typespec_loc
= smallest_type_quals_location (type_quals
,
10300 declspecs
->locations
);
10301 if (typespec_loc
== UNKNOWN_LOCATION
)
10302 typespec_loc
= declspecs
->locations
[ds_type_spec
];
10303 if (typespec_loc
== UNKNOWN_LOCATION
)
10304 typespec_loc
= input_location
;
10306 /* Look inside a declarator for the name being declared
10307 and get it as a string, for an error message. */
10308 for (id_declarator
= declarator
;
10310 id_declarator
= id_declarator
->declarator
)
10312 if (id_declarator
->kind
!= cdk_id
)
10313 innermost_code
= id_declarator
->kind
;
10315 switch (id_declarator
->kind
)
10318 if (id_declarator
->declarator
10319 && id_declarator
->declarator
->kind
== cdk_id
)
10321 sfk
= id_declarator
->declarator
->u
.id
.sfk
;
10322 if (sfk
== sfk_destructor
)
10329 tree qualifying_scope
= id_declarator
->u
.id
.qualifying_scope
;
10330 tree decl
= id_declarator
->u
.id
.unqualified_name
;
10333 if (qualifying_scope
)
10335 if (check_for_bare_parameter_packs (qualifying_scope
,
10336 id_declarator
->id_loc
))
10337 return error_mark_node
;
10338 if (at_function_scope_p ())
10342 A declarator-id shall not be qualified except
10345 None of the cases are permitted in block
10347 if (qualifying_scope
== global_namespace
)
10348 error ("invalid use of qualified-name %<::%D%>",
10350 else if (TYPE_P (qualifying_scope
))
10351 error ("invalid use of qualified-name %<%T::%D%>",
10352 qualifying_scope
, decl
);
10354 error ("invalid use of qualified-name %<%D::%D%>",
10355 qualifying_scope
, decl
);
10356 return error_mark_node
;
10358 else if (TYPE_P (qualifying_scope
))
10360 ctype
= qualifying_scope
;
10361 if (!MAYBE_CLASS_TYPE_P (ctype
))
10363 error ("%q#T is not a class or a namespace", ctype
);
10366 else if (innermost_code
!= cdk_function
10367 && current_class_type
10368 && !uniquely_derived_from_p (ctype
,
10369 current_class_type
))
10371 error ("invalid use of qualified-name %<%T::%D%>",
10372 qualifying_scope
, decl
);
10373 return error_mark_node
;
10376 else if (TREE_CODE (qualifying_scope
) == NAMESPACE_DECL
)
10377 in_namespace
= qualifying_scope
;
10379 switch (TREE_CODE (decl
))
10383 if (innermost_code
!= cdk_function
)
10385 error ("declaration of %qD as non-function", decl
);
10386 return error_mark_node
;
10388 else if (!qualifying_scope
10389 && !(current_class_type
&& at_class_scope_p ()))
10391 error ("declaration of %qD as non-member", decl
);
10392 return error_mark_node
;
10395 tree type
= TREE_OPERAND (decl
, 0);
10397 type
= constructor_name (type
);
10398 name
= identifier_to_locale (IDENTIFIER_POINTER (type
));
10403 case TEMPLATE_ID_EXPR
:
10405 tree fns
= TREE_OPERAND (decl
, 0);
10408 if (!identifier_p (dname
))
10409 dname
= OVL_NAME (dname
);
10411 /* Fall through. */
10413 case IDENTIFIER_NODE
:
10414 if (identifier_p (decl
))
10417 if (IDENTIFIER_KEYWORD_P (dname
))
10419 error ("declarator-id missing; using reserved word %qD",
10421 name
= identifier_to_locale (IDENTIFIER_POINTER (dname
));
10423 else if (!IDENTIFIER_CONV_OP_P (dname
))
10424 name
= identifier_to_locale (IDENTIFIER_POINTER (dname
));
10427 gcc_assert (flags
== NO_SPECIAL
);
10428 flags
= TYPENAME_FLAG
;
10429 sfk
= sfk_conversion
;
10430 tree glob
= get_global_binding (dname
);
10431 if (glob
&& TREE_CODE (glob
) == TYPE_DECL
)
10432 name
= identifier_to_locale (IDENTIFIER_POINTER (dname
));
10434 name
= "<invalid operator>";
10439 gcc_unreachable ();
10446 case cdk_reference
:
10451 name
= "structured binding";
10455 return error_mark_node
;
10458 gcc_unreachable ();
10460 if (id_declarator
->kind
== cdk_id
)
10466 The declarator in a function-definition shall have the form
10467 D1 ( parameter-declaration-clause) ... */
10468 if (funcdef_flag
&& innermost_code
!= cdk_function
)
10470 error ("function definition does not declare parameters");
10471 return error_mark_node
;
10474 if (flags
== TYPENAME_FLAG
10475 && innermost_code
!= cdk_function
10476 && ! (ctype
&& !declspecs
->any_specifiers_p
))
10478 error ("declaration of %qD as non-function", dname
);
10479 return error_mark_node
;
10482 if (dname
&& identifier_p (dname
))
10484 if (UDLIT_OPER_P (dname
)
10485 && innermost_code
!= cdk_function
)
10487 error ("declaration of %qD as non-function", dname
);
10488 return error_mark_node
;
10491 if (IDENTIFIER_ANY_OP_P (dname
))
10495 error ("declaration of %qD as %<typedef%>", dname
);
10496 return error_mark_node
;
10498 else if (decl_context
== PARM
|| decl_context
== CATCHPARM
)
10500 error ("declaration of %qD as parameter", dname
);
10501 return error_mark_node
;
10506 /* Anything declared one level down from the top level
10507 must be one of the parameters of a function
10508 (because the body is at least two levels down). */
10510 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
10511 by not allowing C++ class definitions to specify their parameters
10512 with xdecls (must be spec.d in the parmlist).
10514 Since we now wait to push a class scope until we are sure that
10515 we are in a legitimate method context, we must set oldcname
10516 explicitly (since current_class_name is not yet alive).
10518 We also want to avoid calling this a PARM if it is in a namespace. */
10520 if (decl_context
== NORMAL
&& !toplevel_bindings_p ())
10522 cp_binding_level
*b
= current_binding_level
;
10523 current_binding_level
= b
->level_chain
;
10524 if (current_binding_level
!= 0 && toplevel_bindings_p ())
10525 decl_context
= PARM
;
10526 current_binding_level
= b
;
10530 name
= decl_context
== PARM
? "parameter" : "type name";
10532 if (concept_p
&& typedef_p
)
10534 error_at (declspecs
->locations
[ds_concept
],
10535 "%<concept%> cannot appear in a typedef declaration");
10536 return error_mark_node
;
10539 if (constexpr_p
&& typedef_p
)
10541 error_at (declspecs
->locations
[ds_constexpr
],
10542 "%<constexpr%> cannot appear in a typedef declaration");
10543 return error_mark_node
;
10546 /* If there were multiple types specified in the decl-specifier-seq,
10547 issue an error message. */
10548 if (declspecs
->multiple_types_p
)
10550 error ("two or more data types in declaration of %qs", name
);
10551 return error_mark_node
;
10554 if (declspecs
->conflicting_specifiers_p
)
10556 error ("conflicting specifiers in declaration of %qs", name
);
10557 return error_mark_node
;
10560 /* Extract the basic type from the decl-specifier-seq. */
10561 type
= declspecs
->type
;
10562 if (type
== error_mark_node
)
10565 type_was_error_mark_node
= true;
10567 cp_warn_deprecated_use (type
);
10568 if (type
&& TREE_CODE (type
) == TYPE_DECL
)
10570 typedef_decl
= type
;
10571 type
= TREE_TYPE (typedef_decl
);
10572 if (DECL_ARTIFICIAL (typedef_decl
))
10573 cp_warn_deprecated_use (type
);
10575 /* No type at all: default to `int', and set DEFAULTED_INT
10576 because it was not a user-defined typedef. */
10577 if (type
== NULL_TREE
)
10579 if (signed_p
|| unsigned_p
|| long_p
|| short_p
)
10581 /* These imply 'int'. */
10582 type
= integer_type_node
;
10585 /* If we just have "complex", it is equivalent to "complex double". */
10586 else if (!longlong
&& !explicit_intN
10587 && decl_spec_seq_has_spec_p (declspecs
, ds_complex
))
10589 type
= double_type_node
;
10590 pedwarn (declspecs
->locations
[ds_complex
], OPT_Wpedantic
,
10591 "ISO C++ does not support plain %<complex%> meaning "
10592 "%<double complex%>");
10595 /* Gather flags. */
10596 explicit_int
= declspecs
->explicit_int_p
;
10597 explicit_char
= declspecs
->explicit_char_p
;
10600 /* See the code below that used this. */
10602 decl_attr
= DECL_ATTRIBUTES (typedef_decl
);
10604 typedef_type
= type
;
10606 if (sfk
== sfk_conversion
|| sfk
== sfk_deduction_guide
)
10607 ctor_return_type
= TREE_TYPE (dname
);
10609 ctor_return_type
= ctype
;
10611 if (sfk
!= sfk_none
)
10613 type
= check_special_function_return_type (sfk
, type
,
10616 declspecs
->locations
);
10617 type_quals
= TYPE_UNQUALIFIED
;
10619 else if (type
== NULL_TREE
)
10625 /* We handle `main' specially here, because 'main () { }' is so
10626 common. With no options, it is allowed. With -Wreturn-type,
10627 it is a warning. It is only an error with -pedantic-errors. */
10628 is_main
= (funcdef_flag
10629 && dname
&& identifier_p (dname
)
10630 && MAIN_NAME_P (dname
)
10631 && ctype
== NULL_TREE
10632 && in_namespace
== NULL_TREE
10633 && current_namespace
== global_namespace
);
10635 if (type_was_error_mark_node
)
10636 /* We've already issued an error, don't complain more. */;
10637 else if (in_system_header_at (input_location
) || flag_ms_extensions
)
10638 /* Allow it, sigh. */;
10639 else if (! is_main
)
10640 permerror (input_location
, "ISO C++ forbids declaration of %qs with no type", name
);
10642 pedwarn (input_location
, OPT_Wpedantic
,
10643 "ISO C++ forbids declaration of %qs with no type", name
);
10645 warning (OPT_Wreturn_type
,
10646 "ISO C++ forbids declaration of %qs with no type", name
);
10648 if (type_was_error_mark_node
&& template_parm_flag
)
10649 /* FIXME we should be able to propagate the error_mark_node as is
10650 for other contexts too. */
10651 type
= error_mark_node
;
10653 type
= integer_type_node
;
10660 if (! int_n_enabled_p
[declspecs
->int_n_idx
])
10662 error ("%<__int%d%> is not supported by this target",
10663 int_n_data
[declspecs
->int_n_idx
].bitsize
);
10664 explicit_intN
= false;
10666 else if (pedantic
&& ! in_system_header_at (input_location
))
10667 pedwarn (input_location
, OPT_Wpedantic
,
10668 "ISO C++ does not support %<__int%d%> for %qs",
10669 int_n_data
[declspecs
->int_n_idx
].bitsize
, name
);
10672 /* Now process the modifiers that were specified
10673 and check for invalid combinations. */
10675 /* Long double is a special combination. */
10676 if (long_p
&& !longlong
&& TYPE_MAIN_VARIANT (type
) == double_type_node
)
10679 type
= cp_build_qualified_type (long_double_type_node
,
10680 cp_type_quals (type
));
10683 /* Check all other uses of type modifiers. */
10685 if (unsigned_p
|| signed_p
|| long_p
|| short_p
)
10692 loc
= declspecs
->locations
[ds_unsigned
];
10697 loc
= declspecs
->locations
[ds_signed
];
10702 loc
= declspecs
->locations
[ds_long_long
];
10707 loc
= declspecs
->locations
[ds_long
];
10709 else /* if (short_p) */
10712 loc
= declspecs
->locations
[ds_short
];
10717 if (signed_p
&& unsigned_p
)
10719 gcc_rich_location
richloc (declspecs
->locations
[ds_signed
]);
10720 richloc
.add_range (declspecs
->locations
[ds_unsigned
]);
10721 error_at (&richloc
,
10722 "%<signed%> and %<unsigned%> specified together");
10724 else if (long_p
&& short_p
)
10726 gcc_rich_location
richloc (declspecs
->locations
[ds_long
]);
10727 richloc
.add_range (declspecs
->locations
[ds_short
]);
10728 error_at (&richloc
, "%<long%> and %<short%> specified together");
10730 else if (TREE_CODE (type
) != INTEGER_TYPE
10731 || type
== char16_type_node
|| type
== char32_type_node
10732 || ((long_p
|| short_p
)
10733 && (explicit_char
|| explicit_intN
)))
10734 error_at (loc
, "%qs specified with %qT", key
, type
);
10735 else if (!explicit_int
&& !defaulted_int
10736 && !explicit_char
&& !explicit_intN
)
10740 pedwarn (loc
, OPT_Wpedantic
, "%qs specified with %qT",
10742 ok
= !flag_pedantic_errors
;
10744 else if (declspecs
->decltype_p
)
10745 error_at (loc
, "%qs specified with %<decltype%>", key
);
10747 error_at (loc
, "%qs specified with %<typeof%>", key
);
10752 /* Discard the type modifiers if they are invalid. */
10755 unsigned_p
= false;
10763 /* Decide whether an integer type is signed or not.
10764 Optionally treat bitfields as signed by default. */
10768 It is implementation-defined whether a plain (neither
10769 explicitly signed or unsigned) char, short, int, or long
10770 bit-field is signed or unsigned.
10772 Naturally, we extend this to long long as well. Note that
10773 this does not include wchar_t. */
10774 || (bitfield
&& !flag_signed_bitfields
10776 /* A typedef for plain `int' without `signed' can be
10777 controlled just like plain `int', but a typedef for
10778 `signed int' cannot be so controlled. */
10780 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
))
10781 && TREE_CODE (type
) == INTEGER_TYPE
10782 && !same_type_p (TYPE_MAIN_VARIANT (type
), wchar_type_node
)))
10785 type
= int_n_trees
[declspecs
->int_n_idx
].unsigned_type
;
10787 type
= long_long_unsigned_type_node
;
10789 type
= long_unsigned_type_node
;
10791 type
= short_unsigned_type_node
;
10792 else if (type
== char_type_node
)
10793 type
= unsigned_char_type_node
;
10794 else if (typedef_decl
)
10795 type
= unsigned_type_for (type
);
10797 type
= unsigned_type_node
;
10799 else if (signed_p
&& type
== char_type_node
)
10800 type
= signed_char_type_node
;
10801 else if (explicit_intN
)
10802 type
= int_n_trees
[declspecs
->int_n_idx
].signed_type
;
10804 type
= long_long_integer_type_node
;
10806 type
= long_integer_type_node
;
10808 type
= short_integer_type_node
;
10810 if (decl_spec_seq_has_spec_p (declspecs
, ds_complex
))
10812 if (TREE_CODE (type
) != INTEGER_TYPE
&& TREE_CODE (type
) != REAL_TYPE
)
10813 error ("complex invalid for %qs", name
);
10814 /* If a modifier is specified, the resulting complex is the complex
10815 form of TYPE. E.g, "complex short" is "complex short int". */
10816 else if (type
== integer_type_node
)
10817 type
= complex_integer_type_node
;
10818 else if (type
== float_type_node
)
10819 type
= complex_float_type_node
;
10820 else if (type
== double_type_node
)
10821 type
= complex_double_type_node
;
10822 else if (type
== long_double_type_node
)
10823 type
= complex_long_double_type_node
;
10825 type
= build_complex_type (type
);
10828 /* If we're using the injected-class-name to form a compound type or a
10829 declaration, replace it with the underlying class so we don't get
10830 redundant typedefs in the debug output. But if we are returning the
10831 type unchanged, leave it alone so that it's available to
10832 maybe_get_template_decl_from_type_decl. */
10833 if (CLASS_TYPE_P (type
)
10834 && DECL_SELF_REFERENCE_P (TYPE_NAME (type
))
10835 && type
== TREE_TYPE (TYPE_NAME (type
))
10836 && (declarator
|| type_quals
))
10837 type
= DECL_ORIGINAL_TYPE (TYPE_NAME (type
));
10839 type_quals
|= cp_type_quals (type
);
10840 type
= cp_build_qualified_type_real
10841 (type
, type_quals
, ((((typedef_decl
&& !DECL_ARTIFICIAL (typedef_decl
))
10842 || declspecs
->decltype_p
)
10843 ? tf_ignore_bad_quals
: 0) | tf_warning_or_error
));
10844 /* We might have ignored or rejected some of the qualifiers. */
10845 type_quals
= cp_type_quals (type
);
10847 if (cxx_dialect
>= cxx17
&& type
&& is_auto (type
)
10848 && innermost_code
!= cdk_function
10849 && id_declarator
&& declarator
!= id_declarator
)
10850 if (tree tmpl
= CLASS_PLACEHOLDER_TEMPLATE (type
))
10852 error_at (typespec_loc
, "template placeholder type %qT must be followed "
10853 "by a simple declarator-id", type
);
10854 inform (DECL_SOURCE_LOCATION (tmpl
), "%qD declared here", tmpl
);
10858 inlinep
= decl_spec_seq_has_spec_p (declspecs
, ds_inline
);
10859 virtualp
= decl_spec_seq_has_spec_p (declspecs
, ds_virtual
);
10860 explicitp
= decl_spec_seq_has_spec_p (declspecs
, ds_explicit
);
10862 storage_class
= declspecs
->storage_class
;
10863 if (storage_class
== sc_static
)
10864 staticp
= 1 + (decl_context
== FIELD
);
10870 gcc_rich_location
richloc (declspecs
->locations
[ds_virtual
]);
10871 richloc
.add_range (declspecs
->locations
[ds_storage_class
]);
10872 error_at (&richloc
, "member %qD cannot be declared both %<virtual%> "
10873 "and %<static%>", dname
);
10874 storage_class
= sc_none
;
10877 if (constexpr_p
&& cxx_dialect
< cxx2a
)
10879 gcc_rich_location
richloc (declspecs
->locations
[ds_virtual
]);
10880 richloc
.add_range (declspecs
->locations
[ds_constexpr
]);
10881 pedwarn (&richloc
, OPT_Wpedantic
, "member %qD can be declared both "
10882 "%<virtual%> and %<constexpr%> only in -std=c++2a or "
10883 "-std=gnu++2a", dname
);
10886 friendp
= decl_spec_seq_has_spec_p (declspecs
, ds_friend
);
10888 /* Issue errors about use of storage classes for parameters. */
10889 if (decl_context
== PARM
)
10893 error_at (declspecs
->locations
[ds_typedef
],
10894 "typedef declaration invalid in parameter declaration");
10895 return error_mark_node
;
10897 else if (template_parm_flag
&& storage_class
!= sc_none
)
10899 error_at (min_location (declspecs
->locations
[ds_thread
],
10900 declspecs
->locations
[ds_storage_class
]),
10901 "storage class specified for template parameter %qs",
10903 return error_mark_node
;
10905 else if (storage_class
== sc_static
10906 || storage_class
== sc_extern
10909 error_at (min_location (declspecs
->locations
[ds_thread
],
10910 declspecs
->locations
[ds_storage_class
]),
10911 "storage class specified for parameter %qs", name
);
10912 return error_mark_node
;
10915 /* Function parameters cannot be concept. */
10917 error_at (declspecs
->locations
[ds_concept
],
10918 "a parameter cannot be declared %<concept%>");
10919 /* Function parameters cannot be constexpr. If we saw one, moan
10920 and pretend it wasn't there. */
10921 else if (constexpr_p
)
10923 error_at (declspecs
->locations
[ds_constexpr
],
10924 "a parameter cannot be declared %<constexpr%>");
10929 /* Give error if `virtual' is used outside of class declaration. */
10931 && (current_class_name
== NULL_TREE
|| decl_context
!= FIELD
))
10933 error_at (declspecs
->locations
[ds_virtual
],
10934 "%<virtual%> outside class declaration");
10938 if (innermost_code
== cdk_decomp
)
10940 location_t loc
= (declarator
->kind
== cdk_reference
10941 ? declarator
->declarator
->id_loc
: declarator
->id_loc
);
10943 error_at (declspecs
->locations
[ds_inline
],
10944 "structured binding declaration cannot be %<inline%>");
10946 error_at (declspecs
->locations
[ds_typedef
],
10947 "structured binding declaration cannot be %<typedef%>");
10949 error_at (declspecs
->locations
[ds_constexpr
], "structured "
10950 "binding declaration cannot be %<constexpr%>");
10952 error_at (declspecs
->locations
[ds_thread
],
10953 "structured binding declaration cannot be %qs",
10954 declspecs
->gnu_thread_keyword_p
10955 ? "__thread" : "thread_local");
10957 error_at (declspecs
->locations
[ds_concept
],
10958 "structured binding declaration cannot be %<concept%>");
10959 switch (storage_class
)
10964 error_at (loc
, "structured binding declaration cannot be "
10968 error_at (loc
, "structured binding declaration cannot be "
10972 error_at (loc
, "structured binding declaration cannot be "
10976 error_at (loc
, "structured binding declaration cannot be "
10980 error_at (loc
, "structured binding declaration cannot be "
10984 gcc_unreachable ();
10986 if (TREE_CODE (type
) != TEMPLATE_TYPE_PARM
10987 || TYPE_IDENTIFIER (type
) != auto_identifier
)
10989 if (type
!= error_mark_node
)
10991 error_at (loc
, "structured binding declaration cannot have "
10994 "type must be cv-qualified %<auto%> or reference to "
10995 "cv-qualified %<auto%>");
10997 type
= build_qualified_type (make_auto (), type_quals
);
10998 declspecs
->type
= type
;
11005 storage_class
= sc_none
;
11007 declspecs
->storage_class
= sc_none
;
11008 declspecs
->locations
[ds_thread
] = UNKNOWN_LOCATION
;
11011 /* Static anonymous unions are dealt with here. */
11012 if (staticp
&& decl_context
== TYPENAME
11014 && ANON_AGGR_TYPE_P (declspecs
->type
))
11015 decl_context
= FIELD
;
11017 /* Warn about storage classes that are invalid for certain
11018 kinds of declarations (parameters, typenames, etc.). */
11021 && storage_class
!= sc_extern
11022 && storage_class
!= sc_static
)
11025 error ("multiple storage classes in declaration of %qs", name
);
11028 if (decl_context
!= NORMAL
11029 && ((storage_class
!= sc_none
11030 && storage_class
!= sc_mutable
)
11033 if ((decl_context
== PARM
|| decl_context
== CATCHPARM
)
11034 && (storage_class
== sc_register
11035 || storage_class
== sc_auto
))
11037 else if (typedef_p
)
11039 else if (decl_context
== FIELD
11040 /* C++ allows static class elements. */
11041 && storage_class
== sc_static
)
11042 /* C++ also allows inlines and signed and unsigned elements,
11043 but in those cases we don't come in here. */
11048 = min_location (declspecs
->locations
[ds_thread
],
11049 declspecs
->locations
[ds_storage_class
]);
11050 if (decl_context
== FIELD
)
11051 error_at (loc
, "storage class specified for %qs", name
);
11052 else if (decl_context
== PARM
|| decl_context
== CATCHPARM
)
11053 error_at (loc
, "storage class specified for parameter %qs", name
);
11055 error_at (loc
, "storage class specified for typename");
11056 if (storage_class
== sc_register
11057 || storage_class
== sc_auto
11058 || storage_class
== sc_extern
11060 storage_class
= sc_none
;
11063 else if (storage_class
== sc_extern
&& funcdef_flag
11064 && ! toplevel_bindings_p ())
11065 error ("nested function %qs declared %<extern%>", name
);
11066 else if (toplevel_bindings_p ())
11068 if (storage_class
== sc_auto
)
11069 error ("top-level declaration of %qs specifies %<auto%>", name
);
11072 && storage_class
!= sc_extern
11073 && storage_class
!= sc_static
)
11075 if (declspecs
->gnu_thread_keyword_p
)
11076 pedwarn (declspecs
->locations
[ds_thread
],
11077 0, "function-scope %qs implicitly auto and "
11078 "declared %<__thread%>", name
);
11080 /* When thread_local is applied to a variable of block scope the
11081 storage-class-specifier static is implied if it does not appear
11083 storage_class
= declspecs
->storage_class
= sc_static
;
11087 if (storage_class
&& friendp
)
11089 error_at (min_location (declspecs
->locations
[ds_thread
],
11090 declspecs
->locations
[ds_storage_class
]),
11091 "storage class specifiers invalid in friend function "
11093 storage_class
= sc_none
;
11097 if (!id_declarator
)
11098 unqualified_id
= NULL_TREE
;
11101 unqualified_id
= id_declarator
->u
.id
.unqualified_name
;
11102 switch (TREE_CODE (unqualified_id
))
11105 unqualified_id
= TREE_OPERAND (unqualified_id
, 0);
11106 if (TYPE_P (unqualified_id
))
11107 unqualified_id
= constructor_name (unqualified_id
);
11110 case IDENTIFIER_NODE
:
11111 case TEMPLATE_ID_EXPR
:
11115 gcc_unreachable ();
11119 if (declspecs
->std_attributes
)
11121 location_t attr_loc
= declspecs
->locations
[ds_std_attribute
];
11122 if (warning_at (attr_loc
, OPT_Wattributes
, "attribute ignored"))
11123 inform (attr_loc
, "an attribute that appertains to a type-specifier "
11127 /* Determine the type of the entity declared by recurring on the
11129 for (; declarator
; declarator
= declarator
->declarator
)
11131 const cp_declarator
*inner_declarator
;
11134 if (type
== error_mark_node
)
11135 return error_mark_node
;
11137 attrs
= declarator
->attributes
;
11143 if (declarator
== NULL
|| declarator
->kind
== cdk_id
)
11144 attr_flags
|= (int) ATTR_FLAG_DECL_NEXT
;
11145 if (declarator
->kind
== cdk_function
)
11146 attr_flags
|= (int) ATTR_FLAG_FUNCTION_NEXT
;
11147 if (declarator
->kind
== cdk_array
)
11148 attr_flags
|= (int) ATTR_FLAG_ARRAY_NEXT
;
11149 returned_attrs
= decl_attributes (&type
,
11150 chainon (returned_attrs
, attrs
),
11154 inner_declarator
= declarator
->declarator
;
11156 /* We don't want to warn in parameter context because we don't
11157 yet know if the parse will succeed, and this might turn out
11158 to be a constructor call. */
11159 if (decl_context
!= PARM
11160 && decl_context
!= TYPENAME
11162 && declarator
->parenthesized
!= UNKNOWN_LOCATION
11163 /* If the type is class-like and the inner name used a
11164 global namespace qualifier, we need the parens.
11165 Unfortunately all we can tell is whether a qualified name
11166 was used or not. */
11167 && !(inner_declarator
11168 && inner_declarator
->kind
== cdk_id
11169 && inner_declarator
->u
.id
.qualifying_scope
11170 && (MAYBE_CLASS_TYPE_P (type
)
11171 || TREE_CODE (type
) == ENUMERAL_TYPE
)))
11172 warning_at (declarator
->parenthesized
, OPT_Wparentheses
,
11173 "unnecessary parentheses in declaration of %qs", name
);
11174 if (declarator
->kind
== cdk_id
|| declarator
->kind
== cdk_decomp
)
11177 switch (declarator
->kind
)
11180 type
= create_array_type_for_decl (dname
, type
,
11181 declarator
->u
.array
.bounds
,
11182 declarator
->id_loc
);
11183 if (!valid_array_size_p (input_location
, type
, dname
))
11184 type
= error_mark_node
;
11186 if (declarator
->std_attributes
)
11189 The optional attribute-specifier-seq appertains to the
11191 returned_attrs
= chainon (returned_attrs
,
11192 declarator
->std_attributes
);
11200 /* Declaring a function type. */
11202 input_location
= declspecs
->locations
[ds_type_spec
];
11203 abstract_virtuals_error (ACU_RETURN
, type
);
11204 input_location
= saved_loc
;
11206 /* Pick up type qualifiers which should be applied to `this'. */
11207 memfn_quals
= declarator
->u
.function
.qualifiers
;
11208 /* Pick up virt-specifiers. */
11209 virt_specifiers
= declarator
->u
.function
.virt_specifiers
;
11210 /* And ref-qualifier, too */
11211 rqual
= declarator
->u
.function
.ref_qualifier
;
11212 /* And tx-qualifier. */
11213 tree tx_qual
= declarator
->u
.function
.tx_qualifier
;
11214 /* Pick up the exception specifications. */
11215 raises
= declarator
->u
.function
.exception_specification
;
11216 /* If the exception-specification is ill-formed, let's pretend
11217 there wasn't one. */
11218 if (raises
== error_mark_node
)
11219 raises
= NULL_TREE
;
11222 error_at (location_of (reqs
), "requires-clause on return type");
11223 reqs
= declarator
->u
.function
.requires_clause
;
11225 /* Say it's a definition only for the CALL_EXPR
11226 closest to the identifier. */
11227 funcdecl_p
= inner_declarator
&& inner_declarator
->kind
== cdk_id
;
11229 /* Handle a late-specified return type. */
11230 tree late_return_type
= declarator
->u
.function
.late_return_type
;
11232 /* This is the case e.g. for
11233 using T = auto () -> int. */
11234 || inner_declarator
== NULL
)
11236 if (tree auto_node
= type_uses_auto (type
))
11238 if (!late_return_type
)
11240 if (current_class_type
11241 && LAMBDA_TYPE_P (current_class_type
))
11242 /* OK for C++11 lambdas. */;
11243 else if (cxx_dialect
< cxx14
)
11245 error ("%qs function uses "
11246 "%<auto%> type specifier without trailing "
11247 "return type", name
);
11248 inform (input_location
, "deduced return type "
11249 "only available with -std=c++14 or "
11254 error ("virtual function cannot "
11255 "have deduced return type");
11259 else if (!is_auto (type
) && sfk
!= sfk_conversion
)
11261 error ("%qs function with trailing return type has"
11262 " %qT as its type rather than plain %<auto%>",
11264 return error_mark_node
;
11266 else if (is_auto (type
) && AUTO_IS_DECLTYPE (type
))
11269 error ("%qs function with trailing return type has "
11270 "%<decltype(auto)%> as its type rather than "
11271 "plain %<auto%>", name
);
11273 error ("invalid use of %<decltype(auto)%>");
11274 return error_mark_node
;
11276 tree tmpl
= CLASS_PLACEHOLDER_TEMPLATE (auto_node
);
11278 if (tree late_auto
= type_uses_auto (late_return_type
))
11279 tmpl
= CLASS_PLACEHOLDER_TEMPLATE (late_auto
);
11282 if (!dguide_name_p (unqualified_id
))
11284 error_at (declarator
->id_loc
, "deduced class "
11285 "type %qD in function return type",
11287 inform (DECL_SOURCE_LOCATION (tmpl
),
11288 "%qD declared here", tmpl
);
11289 return error_mark_node
;
11291 else if (!late_return_type
)
11293 error_at (declarator
->id_loc
, "deduction guide "
11294 "for %qT must have trailing return "
11295 "type", TREE_TYPE (tmpl
));
11296 inform (DECL_SOURCE_LOCATION (tmpl
),
11297 "%qD declared here", tmpl
);
11298 return error_mark_node
;
11300 else if (CLASS_TYPE_P (late_return_type
)
11301 && CLASSTYPE_TEMPLATE_INFO (late_return_type
)
11302 && (CLASSTYPE_TI_TEMPLATE (late_return_type
)
11306 error ("trailing return type %qT of deduction guide "
11307 "is not a specialization of %qT",
11308 late_return_type
, TREE_TYPE (tmpl
));
11311 else if (late_return_type
11312 && sfk
!= sfk_conversion
)
11314 if (cxx_dialect
< cxx11
)
11315 /* Not using maybe_warn_cpp0x because this should
11316 always be an error. */
11317 error ("trailing return type only available with "
11318 "-std=c++11 or -std=gnu++11");
11320 error ("%qs function with trailing return type not "
11321 "declared with %<auto%> type specifier", name
);
11322 return error_mark_node
;
11325 type
= splice_late_return_type (type
, late_return_type
);
11326 if (type
== error_mark_node
)
11327 return error_mark_node
;
11329 if (late_return_type
)
11331 late_return_type_p
= true;
11332 type_quals
= cp_type_quals (type
);
11335 if (type_quals
!= TYPE_UNQUALIFIED
)
11337 if (SCALAR_TYPE_P (type
) || VOID_TYPE_P (type
))
11338 warning_at (typespec_loc
, OPT_Wignored_qualifiers
, "type "
11339 "qualifiers ignored on function return type");
11340 /* We now know that the TYPE_QUALS don't apply to the
11341 decl, but to its return type. */
11342 type_quals
= TYPE_UNQUALIFIED
;
11345 /* Error about some types functions can't return. */
11347 if (TREE_CODE (type
) == FUNCTION_TYPE
)
11349 error_at (typespec_loc
, "%qs declared as function returning "
11350 "a function", name
);
11351 return error_mark_node
;
11353 if (TREE_CODE (type
) == ARRAY_TYPE
)
11355 error_at (typespec_loc
, "%qs declared as function returning "
11357 return error_mark_node
;
11360 if (ctype
== NULL_TREE
11361 && decl_context
== FIELD
11364 ctype
= current_class_type
;
11366 if (ctype
&& (sfk
== sfk_constructor
11367 || sfk
== sfk_destructor
))
11369 /* We are within a class's scope. If our declarator name
11370 is the same as the class name, and we are defining
11371 a function, then it is a constructor/destructor, and
11372 therefore returns a void type. */
11374 /* ISO C++ 12.4/2. A destructor may not be declared
11375 const or volatile. A destructor may not be static.
11376 A destructor may not be declared with ref-qualifier.
11378 ISO C++ 12.1. A constructor may not be declared
11379 const or volatile. A constructor may not be
11380 virtual. A constructor may not be static.
11381 A constructor may not be declared with ref-qualifier. */
11383 error ((flags
== DTOR_FLAG
)
11384 ? G_("destructor cannot be static member function")
11385 : G_("constructor cannot be static member function"));
11388 error ((flags
== DTOR_FLAG
)
11389 ? G_("destructors may not be cv-qualified")
11390 : G_("constructors may not be cv-qualified"));
11391 memfn_quals
= TYPE_UNQUALIFIED
;
11396 maybe_warn_cpp0x (CPP0X_REF_QUALIFIER
);
11397 error ((flags
== DTOR_FLAG
)
11398 ? G_("destructors may not be ref-qualified")
11399 : G_("constructors may not be ref-qualified"));
11400 rqual
= REF_QUAL_NONE
;
11403 if (decl_context
== FIELD
11404 && !member_function_or_else (ctype
,
11405 current_class_type
,
11407 return error_mark_node
;
11409 if (flags
!= DTOR_FLAG
)
11411 /* It's a constructor. */
11412 if (explicitp
== 1)
11416 permerror (declspecs
->locations
[ds_virtual
],
11417 "constructors cannot be declared %<virtual%>");
11420 if (decl_context
== FIELD
11421 && sfk
!= sfk_constructor
)
11422 return error_mark_node
;
11424 if (decl_context
== FIELD
)
11431 /* Cannot be both friend and virtual. */
11432 gcc_rich_location
richloc (declspecs
->locations
[ds_virtual
]);
11433 richloc
.add_range (declspecs
->locations
[ds_friend
]);
11434 error_at (&richloc
, "virtual functions cannot be friends");
11437 if (decl_context
== NORMAL
)
11438 error ("friend declaration not in class definition");
11439 if (current_function_decl
&& funcdef_flag
)
11441 error ("can%'t define friend function %qs in a local "
11442 "class definition", name
);
11446 else if (ctype
&& sfk
== sfk_conversion
)
11448 if (explicitp
== 1)
11450 maybe_warn_cpp0x (CPP0X_EXPLICIT_CONVERSION
);
11453 if (late_return_type_p
)
11454 error ("a conversion function cannot have a trailing return type");
11456 else if (sfk
== sfk_deduction_guide
)
11458 if (explicitp
== 1)
11462 tree pushed_scope
= NULL_TREE
;
11464 && decl_context
!= FIELD
11465 && inner_declarator
->u
.id
.qualifying_scope
11466 && CLASS_TYPE_P (inner_declarator
->u
.id
.qualifying_scope
))
11468 = push_scope (inner_declarator
->u
.id
.qualifying_scope
);
11470 arg_types
= grokparms (declarator
->u
.function
.parameters
, &parms
);
11473 pop_scope (pushed_scope
);
11475 if (inner_declarator
11476 && inner_declarator
->kind
== cdk_id
11477 && inner_declarator
->u
.id
.sfk
== sfk_destructor
11478 && arg_types
!= void_list_node
)
11480 error ("destructors may not have parameters");
11481 arg_types
= void_list_node
;
11485 type
= build_function_type (type
, arg_types
);
11487 tree attrs
= declarator
->std_attributes
;
11490 tree att
= build_tree_list (tx_qual
, NULL_TREE
);
11491 /* transaction_safe applies to the type, but
11492 transaction_safe_dynamic applies to the function. */
11493 if (is_attribute_p ("transaction_safe", tx_qual
))
11494 attrs
= chainon (attrs
, att
);
11496 returned_attrs
= chainon (returned_attrs
, att
);
11501 The optional attribute-specifier-seq appertains to
11502 the function type. */
11503 decl_attributes (&type
, attrs
, 0);
11506 type
= build_exception_variant (type
, raises
);
11511 case cdk_reference
:
11513 /* Filter out pointers-to-references and references-to-references.
11514 We can get these if a TYPE_DECL is used. */
11516 if (TYPE_REF_P (type
))
11518 if (declarator
->kind
!= cdk_reference
)
11520 error ("cannot declare pointer to %q#T", type
);
11521 type
= TREE_TYPE (type
);
11524 /* In C++0x, we allow reference to reference declarations
11525 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
11526 and template type arguments [14.3.1/4 temp.arg.type]. The
11527 check for direct reference to reference declarations, which
11528 are still forbidden, occurs below. Reasoning behind the change
11529 can be found in DR106, DR540, and the rvalue reference
11531 else if (cxx_dialect
== cxx98
)
11533 error ("cannot declare reference to %q#T", type
);
11534 type
= TREE_TYPE (type
);
11537 else if (VOID_TYPE_P (type
))
11539 if (declarator
->kind
== cdk_reference
)
11540 error ("cannot declare reference to %q#T", type
);
11541 else if (declarator
->kind
== cdk_ptrmem
)
11542 error ("cannot declare pointer to %q#T member", type
);
11545 /* We now know that the TYPE_QUALS don't apply to the decl,
11546 but to the target of the pointer. */
11547 type_quals
= TYPE_UNQUALIFIED
;
11549 /* This code used to handle METHOD_TYPE, but I don't think it's
11550 possible to get it here anymore. */
11551 gcc_assert (TREE_CODE (type
) != METHOD_TYPE
);
11552 if (declarator
->kind
== cdk_ptrmem
11553 && TREE_CODE (type
) == FUNCTION_TYPE
)
11555 memfn_quals
|= type_memfn_quals (type
);
11556 type
= build_memfn_type (type
,
11557 declarator
->u
.pointer
.class_type
,
11560 if (type
== error_mark_node
)
11561 return error_mark_node
;
11563 rqual
= REF_QUAL_NONE
;
11564 memfn_quals
= TYPE_UNQUALIFIED
;
11567 if (TREE_CODE (type
) == FUNCTION_TYPE
11568 && (type_memfn_quals (type
) != TYPE_UNQUALIFIED
11569 || type_memfn_rqual (type
) != REF_QUAL_NONE
))
11570 error (declarator
->kind
== cdk_reference
11571 ? G_("cannot declare reference to qualified function type %qT")
11572 : G_("cannot declare pointer to qualified function type %qT"),
11575 /* When the pointed-to type involves components of variable size,
11576 care must be taken to ensure that the size evaluation code is
11577 emitted early enough to dominate all the possible later uses
11578 and late enough for the variables on which it depends to have
11581 This is expected to happen automatically when the pointed-to
11582 type has a name/declaration of it's own, but special attention
11583 is required if the type is anonymous.
11585 We handle the NORMAL and FIELD contexts here by inserting a
11586 dummy statement that just evaluates the size at a safe point
11587 and ensures it is not deferred until e.g. within a deeper
11588 conditional context (c++/43555).
11590 We expect nothing to be needed here for PARM or TYPENAME.
11591 Evaluating the size at this point for TYPENAME would
11592 actually be incorrect, as we might be in the middle of an
11593 expression with side effects on the pointed-to type size
11594 "arguments" prior to the pointer declaration point and the
11595 size evaluation could end up prior to the side effects. */
11597 if (!TYPE_NAME (type
)
11598 && (decl_context
== NORMAL
|| decl_context
== FIELD
)
11599 && at_function_scope_p ()
11600 && variably_modified_type_p (type
, NULL_TREE
))
11602 TYPE_NAME (type
) = build_decl (UNKNOWN_LOCATION
, TYPE_DECL
,
11604 add_decl_expr (TYPE_NAME (type
));
11607 if (declarator
->kind
== cdk_reference
)
11609 /* In C++0x, the type we are creating a reference to might be
11610 a typedef which is itself a reference type. In that case,
11611 we follow the reference collapsing rules in
11612 [7.1.3/8 dcl.typedef] to create the final reference type:
11614 "If a typedef TD names a type that is a reference to a type
11615 T, an attempt to create the type 'lvalue reference to cv TD'
11616 creates the type 'lvalue reference to T,' while an attempt
11617 to create the type "rvalue reference to cv TD' creates the
11620 if (VOID_TYPE_P (type
))
11621 /* We already gave an error. */;
11622 else if (TYPE_REF_P (type
))
11624 if (declarator
->u
.reference
.rvalue_ref
)
11625 /* Leave type alone. */;
11627 type
= cp_build_reference_type (TREE_TYPE (type
), false);
11630 type
= cp_build_reference_type
11631 (type
, declarator
->u
.reference
.rvalue_ref
);
11633 /* In C++0x, we need this check for direct reference to
11634 reference declarations, which are forbidden by
11635 [8.3.2/5 dcl.ref]. Reference to reference declarations
11636 are only allowed indirectly through typedefs and template
11637 type arguments. Example:
11639 void foo(int & &); // invalid ref-to-ref decl
11641 typedef int & int_ref;
11642 void foo(int_ref &); // valid ref-to-ref decl
11644 if (inner_declarator
&& inner_declarator
->kind
== cdk_reference
)
11645 error ("cannot declare reference to %q#T, which is not "
11646 "a typedef or a template type argument", type
);
11648 else if (TREE_CODE (type
) == METHOD_TYPE
)
11649 type
= build_ptrmemfunc_type (build_pointer_type (type
));
11650 else if (declarator
->kind
== cdk_ptrmem
)
11652 gcc_assert (TREE_CODE (declarator
->u
.pointer
.class_type
)
11653 != NAMESPACE_DECL
);
11654 if (declarator
->u
.pointer
.class_type
== error_mark_node
)
11655 /* We will already have complained. */
11656 type
= error_mark_node
;
11658 type
= build_ptrmem_type (declarator
->u
.pointer
.class_type
,
11662 type
= build_pointer_type (type
);
11664 /* Process a list of type modifier keywords (such as
11665 const or volatile) that were given inside the `*' or `&'. */
11667 if (declarator
->u
.pointer
.qualifiers
)
11670 = cp_build_qualified_type (type
,
11671 declarator
->u
.pointer
.qualifiers
);
11672 type_quals
= cp_type_quals (type
);
11675 /* Apply C++11 attributes to the pointer, and not to the
11676 type pointed to. This is unlike what is done for GNU
11677 attributes above. It is to comply with [dcl.ptr]/1:
11679 [the optional attribute-specifier-seq (7.6.1) appertains
11680 to the pointer and not to the object pointed to]. */
11681 if (declarator
->std_attributes
)
11682 decl_attributes (&type
, declarator
->std_attributes
,
11692 gcc_unreachable ();
11696 /* A `constexpr' specifier used in an object declaration declares
11697 the object as `const'. */
11698 if (constexpr_p
&& innermost_code
!= cdk_function
)
11700 /* DR1688 says that a `constexpr' specifier in combination with
11701 `volatile' is valid. */
11703 if (!TYPE_REF_P (type
))
11705 type_quals
|= TYPE_QUAL_CONST
;
11706 type
= cp_build_qualified_type (type
, type_quals
);
11710 if (unqualified_id
&& TREE_CODE (unqualified_id
) == TEMPLATE_ID_EXPR
11711 && TREE_CODE (type
) != FUNCTION_TYPE
11712 && TREE_CODE (type
) != METHOD_TYPE
11713 && !variable_template_p (TREE_OPERAND (unqualified_id
, 0)))
11715 error ("template-id %qD used as a declarator",
11717 unqualified_id
= dname
;
11720 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
11721 qualified with a class-name, turn it into a METHOD_TYPE, unless
11722 we know that the function is static. We take advantage of this
11723 opportunity to do other processing that pertains to entities
11724 explicitly declared to be class members. Note that if DECLARATOR
11725 is non-NULL, we know it is a cdk_id declarator; otherwise, we
11726 would not have exited the loop above. */
11728 && declarator
->kind
== cdk_id
11729 && declarator
->u
.id
.qualifying_scope
11730 && MAYBE_CLASS_TYPE_P (declarator
->u
.id
.qualifying_scope
))
11732 ctype
= declarator
->u
.id
.qualifying_scope
;
11733 ctype
= TYPE_MAIN_VARIANT (ctype
);
11734 template_count
= num_template_headers_for_class (ctype
);
11736 if (ctype
== current_class_type
)
11740 permerror (input_location
, "member functions are implicitly "
11741 "friends of their class");
11745 permerror (declarator
->id_loc
,
11746 "extra qualification %<%T::%> on member %qs",
11749 else if (/* If the qualifying type is already complete, then we
11750 can skip the following checks. */
11751 !COMPLETE_TYPE_P (ctype
)
11752 && (/* If the function is being defined, then
11753 qualifying type must certainly be complete. */
11755 /* A friend declaration of "T::f" is OK, even if
11756 "T" is a template parameter. But, if this
11757 function is not a friend, the qualifying type
11758 must be a class. */
11759 || (!friendp
&& !CLASS_TYPE_P (ctype
))
11760 /* For a declaration, the type need not be
11761 complete, if either it is dependent (since there
11762 is no meaningful definition of complete in that
11763 case) or the qualifying class is currently being
11765 || !(dependent_type_p (ctype
)
11766 || currently_open_class (ctype
)))
11767 /* Check that the qualifying type is complete. */
11768 && !complete_type_or_else (ctype
, NULL_TREE
))
11769 return error_mark_node
;
11770 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
11772 if (current_class_type
11773 && (!friendp
|| funcdef_flag
|| initialized
))
11775 error (funcdef_flag
|| initialized
11776 ? G_("cannot define member function %<%T::%s%> "
11778 : G_("cannot declare member function %<%T::%s%> "
11780 ctype
, name
, current_class_type
);
11781 return error_mark_node
;
11784 else if (typedef_p
&& current_class_type
)
11786 error ("cannot declare member %<%T::%s%> within %qT",
11787 ctype
, name
, current_class_type
);
11788 return error_mark_node
;
11792 if (ctype
== NULL_TREE
&& decl_context
== FIELD
&& friendp
== 0)
11793 ctype
= current_class_type
;
11795 /* Now TYPE has the actual type. */
11797 if (returned_attrs
)
11800 *attrlist
= chainon (returned_attrs
, *attrlist
);
11802 attrlist
= &returned_attrs
;
11806 && declarator
->kind
== cdk_id
11807 && declarator
->std_attributes
11808 && attrlist
!= NULL
)
11810 /* [dcl.meaning]/1: The optional attribute-specifier-seq following
11811 a declarator-id appertains to the entity that is declared. */
11812 if (declarator
->std_attributes
!= error_mark_node
)
11813 *attrlist
= chainon (*attrlist
, declarator
->std_attributes
);
11815 /* We should have already diagnosed the issue (c++/78344). */
11816 gcc_assert (seen_error ());
11819 /* Handle parameter packs. */
11820 if (parameter_pack_p
)
11822 if (decl_context
== PARM
)
11823 /* Turn the type into a pack expansion.*/
11824 type
= make_pack_expansion (type
);
11826 error ("non-parameter %qs cannot be a parameter pack", name
);
11829 if ((decl_context
== FIELD
|| decl_context
== PARM
)
11830 && !processing_template_decl
11831 && variably_modified_type_p (type
, NULL_TREE
))
11833 if (decl_context
== FIELD
)
11834 error ("data member may not have variably modified type %qT", type
);
11836 error ("parameter may not have variably modified type %qT", type
);
11837 type
= error_mark_node
;
11840 if (explicitp
== 1 || (explicitp
&& friendp
))
11842 /* [dcl.fct.spec] (C++11) The explicit specifier shall be used only
11843 in the declaration of a constructor or conversion function within
11844 a class definition. */
11845 if (!current_class_type
)
11846 error_at (declspecs
->locations
[ds_explicit
],
11847 "%<explicit%> outside class declaration");
11849 error_at (declspecs
->locations
[ds_explicit
],
11850 "%<explicit%> in friend declaration");
11852 error_at (declspecs
->locations
[ds_explicit
],
11853 "only declarations of constructors and conversion operators "
11854 "can be %<explicit%>");
11858 if (storage_class
== sc_mutable
)
11860 if (decl_context
!= FIELD
|| friendp
)
11862 error ("non-member %qs cannot be declared %<mutable%>", name
);
11863 storage_class
= sc_none
;
11865 else if (decl_context
== TYPENAME
|| typedef_p
)
11867 error ("non-object member %qs cannot be declared %<mutable%>", name
);
11868 storage_class
= sc_none
;
11870 else if (TREE_CODE (type
) == FUNCTION_TYPE
11871 || TREE_CODE (type
) == METHOD_TYPE
)
11873 error ("function %qs cannot be declared %<mutable%>", name
);
11874 storage_class
= sc_none
;
11878 error ("static %qs cannot be declared %<mutable%>", name
);
11879 storage_class
= sc_none
;
11881 else if (type_quals
& TYPE_QUAL_CONST
)
11883 error ("const %qs cannot be declared %<mutable%>", name
);
11884 storage_class
= sc_none
;
11886 else if (TYPE_REF_P (type
))
11888 permerror (input_location
, "reference %qs cannot be declared "
11889 "%<mutable%>", name
);
11890 storage_class
= sc_none
;
11894 /* If this is declaring a typedef name, return a TYPE_DECL. */
11895 if (typedef_p
&& decl_context
!= TYPENAME
)
11897 bool alias_p
= decl_spec_seq_has_spec_p (declspecs
, ds_alias
);
11900 /* This declaration:
11902 typedef void f(int) const;
11904 declares a function type which is not a member of any
11905 particular class, but which is cv-qualified; for
11906 example "f S::*" declares a pointer to a const-qualified
11907 member function of S. We record the cv-qualification in the
11909 if ((rqual
|| memfn_quals
) && TREE_CODE (type
) == FUNCTION_TYPE
)
11911 type
= apply_memfn_quals (type
, memfn_quals
, rqual
);
11913 /* We have now dealt with these qualifiers. */
11914 memfn_quals
= TYPE_UNQUALIFIED
;
11915 rqual
= REF_QUAL_NONE
;
11918 if (type_uses_auto (type
))
11921 error_at (declspecs
->locations
[ds_type_spec
],
11922 "%<auto%> not allowed in alias declaration");
11924 error_at (declspecs
->locations
[ds_type_spec
],
11925 "typedef declared %<auto%>");
11926 type
= error_mark_node
;
11930 error_at (location_of (reqs
), "requires-clause on typedef");
11932 if (id_declarator
&& declarator
->u
.id
.qualifying_scope
)
11934 error ("typedef name may not be a nested-name-specifier");
11935 type
= error_mark_node
;
11938 if (decl_context
== FIELD
)
11939 decl
= build_lang_decl (TYPE_DECL
, unqualified_id
, type
);
11941 decl
= build_decl (input_location
, TYPE_DECL
, unqualified_id
, type
);
11943 if (decl_context
!= FIELD
)
11945 if (!current_function_decl
)
11946 DECL_CONTEXT (decl
) = FROB_CONTEXT (current_namespace
);
11947 else if (DECL_MAYBE_IN_CHARGE_CDTOR_P (current_function_decl
))
11948 /* The TYPE_DECL is "abstract" because there will be
11949 clones of this constructor/destructor, and there will
11950 be copies of this TYPE_DECL generated in those
11951 clones. The decloning optimization (for space) may
11952 revert this subsequently if it determines that
11953 the clones should share a common implementation. */
11954 DECL_ABSTRACT_P (decl
) = true;
11956 else if (current_class_type
11957 && constructor_name_p (unqualified_id
, current_class_type
))
11958 permerror (input_location
, "ISO C++ forbids nested type %qD with same name "
11959 "as enclosing class",
11962 /* If the user declares "typedef struct {...} foo" then the
11963 struct will have an anonymous name. Fill that name in now.
11964 Nothing can refer to it, so nothing needs know about the name
11966 if (type
!= error_mark_node
11968 && TYPE_NAME (type
)
11969 && TREE_CODE (TYPE_NAME (type
)) == TYPE_DECL
11970 && TYPE_UNNAMED_P (type
)
11971 && declspecs
->type_definition_p
11972 && attributes_naming_typedef_ok (*attrlist
)
11973 && cp_type_quals (type
) == TYPE_UNQUALIFIED
)
11974 name_unnamed_type (type
, decl
);
11977 || (typedef_decl
&& C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
)))
11978 C_TYPEDEF_EXPLICITLY_SIGNED (decl
) = 1;
11980 bad_specifiers (decl
, BSP_TYPE
, virtualp
,
11981 memfn_quals
!= TYPE_UNQUALIFIED
,
11982 inlinep
, friendp
, raises
!= NULL_TREE
,
11983 declspecs
->locations
);
11986 /* Acknowledge that this was written:
11987 `using analias = atype;'. */
11988 TYPE_DECL_ALIAS_P (decl
) = 1;
11993 /* Detect the case of an array type of unspecified size
11994 which came, as such, direct from a typedef name.
11995 We must copy the type, so that the array's domain can be
11996 individually set by the object's initializer. */
11998 if (type
&& typedef_type
11999 && TREE_CODE (type
) == ARRAY_TYPE
&& !TYPE_DOMAIN (type
)
12000 && TYPE_MAIN_VARIANT (type
) == TYPE_MAIN_VARIANT (typedef_type
))
12001 type
= build_cplus_array_type (TREE_TYPE (type
), NULL_TREE
);
12003 /* Detect where we're using a typedef of function type to declare a
12004 function. PARMS will not be set, so we must create it now. */
12006 if (type
== typedef_type
&& TREE_CODE (type
) == FUNCTION_TYPE
)
12008 tree decls
= NULL_TREE
;
12011 for (args
= TYPE_ARG_TYPES (type
);
12012 args
&& args
!= void_list_node
;
12013 args
= TREE_CHAIN (args
))
12015 tree decl
= cp_build_parm_decl (NULL_TREE
, NULL_TREE
,
12016 TREE_VALUE (args
));
12018 DECL_CHAIN (decl
) = decls
;
12022 parms
= nreverse (decls
);
12024 if (decl_context
!= TYPENAME
)
12026 /* The qualifiers on the function type become the qualifiers on
12027 the non-static member function. */
12028 memfn_quals
|= type_memfn_quals (type
);
12029 rqual
= type_memfn_rqual (type
);
12030 type_quals
= TYPE_UNQUALIFIED
;
12034 /* If this is a type name (such as, in a cast or sizeof),
12035 compute the type and return it now. */
12037 if (decl_context
== TYPENAME
)
12039 /* Note that here we don't care about type_quals. */
12041 /* Special case: "friend class foo" looks like a TYPENAME context. */
12046 error ("%<inline%> specified for friend class declaration");
12052 /* Don't allow friend declaration without a class-key. */
12053 if (TREE_CODE (type
) == TEMPLATE_TYPE_PARM
)
12054 permerror (input_location
, "template parameters cannot be friends");
12055 else if (TREE_CODE (type
) == TYPENAME_TYPE
)
12056 permerror (input_location
, "friend declaration requires class-key, "
12057 "i.e. %<friend class %T::%D%>",
12058 TYPE_CONTEXT (type
), TYPENAME_TYPE_FULLNAME (type
));
12060 permerror (input_location
, "friend declaration requires class-key, "
12061 "i.e. %<friend %#T%>",
12065 /* Only try to do this stuff if we didn't already give up. */
12066 if (type
!= integer_type_node
)
12068 /* A friendly class? */
12069 if (current_class_type
)
12070 make_friend_class (current_class_type
, TYPE_MAIN_VARIANT (type
),
12071 /*complain=*/true);
12073 error ("trying to make class %qT a friend of global scope",
12076 type
= void_type_node
;
12079 else if (memfn_quals
|| rqual
)
12081 if (ctype
== NULL_TREE
12082 && TREE_CODE (type
) == METHOD_TYPE
)
12083 ctype
= TYPE_METHOD_BASETYPE (type
);
12086 type
= build_memfn_type (type
, ctype
, memfn_quals
, rqual
);
12087 /* Core issue #547: need to allow this in template type args.
12088 Allow it in general in C++11 for alias-declarations. */
12089 else if ((template_type_arg
|| cxx_dialect
>= cxx11
)
12090 && TREE_CODE (type
) == FUNCTION_TYPE
)
12091 type
= apply_memfn_quals (type
, memfn_quals
, rqual
);
12093 error ("invalid qualifiers on non-member function type");
12097 error_at (location_of (reqs
), "requires-clause on type-id");
12101 else if (unqualified_id
== NULL_TREE
&& decl_context
!= PARM
12102 && decl_context
!= CATCHPARM
12103 && TREE_CODE (type
) != UNION_TYPE
12105 && innermost_code
!= cdk_decomp
)
12107 error ("abstract declarator %qT used as declaration", type
);
12108 return error_mark_node
;
12111 if (!FUNC_OR_METHOD_TYPE_P (type
))
12113 /* Only functions may be declared using an operator-function-id. */
12114 if (dname
&& IDENTIFIER_ANY_OP_P (dname
))
12116 error ("declaration of %qD as non-function", dname
);
12117 return error_mark_node
;
12121 error_at (location_of (reqs
),
12122 "requires-clause on declaration of non-function type %qT",
12126 /* We don't check parameter types here because we can emit a better
12127 error message later. */
12128 if (decl_context
!= PARM
)
12130 type
= check_var_type (unqualified_id
, type
);
12131 if (type
== error_mark_node
)
12132 return error_mark_node
;
12135 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
12136 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
12138 if (decl_context
== PARM
|| decl_context
== CATCHPARM
)
12140 if (ctype
|| in_namespace
)
12141 error ("cannot use %<::%> in parameter declaration");
12143 if (type_uses_auto (type
)
12144 && !(cxx_dialect
>= cxx17
&& template_parm_flag
))
12146 if (cxx_dialect
>= cxx14
)
12147 error ("%<auto%> parameter not permitted in this context");
12149 error ("parameter declared %<auto%>");
12150 type
= error_mark_node
;
12153 /* A parameter declared as an array of T is really a pointer to T.
12154 One declared as a function is really a pointer to a function.
12155 One declared as a member is really a pointer to member. */
12157 if (TREE_CODE (type
) == ARRAY_TYPE
)
12159 /* Transfer const-ness of array into that of type pointed to. */
12160 type
= build_pointer_type (TREE_TYPE (type
));
12161 type_quals
= TYPE_UNQUALIFIED
;
12162 array_parameter_p
= true;
12164 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
12165 type
= build_pointer_type (type
);
12168 if (ctype
&& TREE_CODE (type
) == FUNCTION_TYPE
&& staticp
< 2
12169 && !(identifier_p (unqualified_id
)
12170 && IDENTIFIER_NEWDEL_OP_P (unqualified_id
)))
12172 cp_cv_quals real_quals
= memfn_quals
;
12173 if (cxx_dialect
< cxx14
&& constexpr_p
12174 && sfk
!= sfk_constructor
&& sfk
!= sfk_destructor
)
12175 real_quals
|= TYPE_QUAL_CONST
;
12176 type
= build_memfn_type (type
, ctype
, real_quals
, rqual
);
12180 tree decl
= NULL_TREE
;
12182 if (decl_context
== PARM
)
12184 decl
= cp_build_parm_decl (NULL_TREE
, unqualified_id
, type
);
12185 DECL_ARRAY_PARAMETER_P (decl
) = array_parameter_p
;
12187 bad_specifiers (decl
, BSP_PARM
, virtualp
,
12188 memfn_quals
!= TYPE_UNQUALIFIED
,
12189 inlinep
, friendp
, raises
!= NULL_TREE
,
12190 declspecs
->locations
);
12192 else if (decl_context
== FIELD
)
12194 if (!staticp
&& !friendp
&& TREE_CODE (type
) != METHOD_TYPE
)
12195 if (tree auto_node
= type_uses_auto (type
))
12197 location_t loc
= declspecs
->locations
[ds_type_spec
];
12198 if (CLASS_PLACEHOLDER_TEMPLATE (auto_node
))
12199 error_at (loc
, "invalid use of template-name %qE without an "
12201 CLASS_PLACEHOLDER_TEMPLATE (auto_node
));
12203 error_at (loc
, "non-static data member declared with "
12204 "placeholder %qT", auto_node
);
12205 type
= error_mark_node
;
12208 /* The C99 flexible array extension. */
12209 if (!staticp
&& TREE_CODE (type
) == ARRAY_TYPE
12210 && TYPE_DOMAIN (type
) == NULL_TREE
)
12213 && (TREE_CODE (ctype
) == UNION_TYPE
12214 || TREE_CODE (ctype
) == QUAL_UNION_TYPE
))
12216 error ("flexible array member in union");
12217 type
= error_mark_node
;
12221 /* Array is a flexible member. */
12222 if (in_system_header_at (input_location
))
12223 /* Do not warn on flexible array members in system
12224 headers because glibc uses them. */;
12226 pedwarn (declarator
->id_loc
, OPT_Wpedantic
,
12227 "ISO C++ forbids flexible array member %qs", name
);
12229 pedwarn (input_location
, OPT_Wpedantic
,
12230 "ISO C++ forbids flexible array members");
12232 /* Flexible array member has a null domain. */
12233 type
= build_cplus_array_type (TREE_TYPE (type
), NULL_TREE
);
12237 if (type
== error_mark_node
)
12239 /* Happens when declaring arrays of sizes which
12240 are error_mark_node, for example. */
12243 else if (in_namespace
&& !friendp
)
12245 /* Something like struct S { int N::j; }; */
12246 error ("invalid use of %<::%>");
12247 return error_mark_node
;
12249 else if (TREE_CODE (type
) == FUNCTION_TYPE
12250 || TREE_CODE (type
) == METHOD_TYPE
)
12253 tree function_context
;
12257 /* This should never happen in pure C++ (the check
12258 could be an assert). It could happen in
12259 Objective-C++ if someone writes invalid code that
12260 uses a function declaration for an instance
12261 variable or property (instance variables and
12262 properties are parsed as FIELD_DECLs, but they are
12263 part of an Objective-C class, not a C++ class).
12264 That code is invalid and is caught by this
12268 error ("declaration of function %qD in invalid context",
12270 return error_mark_node
;
12273 /* ``A union may [ ... ] not [ have ] virtual functions.''
12275 if (virtualp
&& TREE_CODE (ctype
) == UNION_TYPE
)
12277 error_at (declspecs
->locations
[ds_virtual
],
12278 "function %qD declared %<virtual%> inside a union",
12280 return error_mark_node
;
12284 && identifier_p (unqualified_id
)
12285 && IDENTIFIER_NEWDEL_OP_P (unqualified_id
))
12287 error_at (declspecs
->locations
[ds_virtual
],
12288 "%qD cannot be declared %<virtual%>, since it "
12289 "is always static", unqualified_id
);
12294 /* Check that the name used for a destructor makes sense. */
12295 if (sfk
== sfk_destructor
)
12297 tree uqname
= id_declarator
->u
.id
.unqualified_name
;
12301 gcc_assert (friendp
);
12302 error ("expected qualified name in friend declaration "
12303 "for destructor %qD", uqname
);
12304 return error_mark_node
;
12307 if (!check_dtor_name (ctype
, TREE_OPERAND (uqname
, 0)))
12309 error ("declaration of %qD as member of %qT",
12311 return error_mark_node
;
12315 error_at (declspecs
->locations
[ds_concept
],
12316 "a destructor cannot be %<concept%>");
12317 return error_mark_node
;
12321 error_at (declspecs
->locations
[ds_constexpr
],
12322 "a destructor cannot be %<constexpr%>");
12323 return error_mark_node
;
12326 else if (sfk
== sfk_constructor
&& friendp
&& !ctype
)
12328 error ("expected qualified name in friend declaration "
12329 "for constructor %qD",
12330 id_declarator
->u
.id
.unqualified_name
);
12331 return error_mark_node
;
12333 if (sfk
== sfk_constructor
)
12336 error_at (declspecs
->locations
[ds_concept
],
12337 "a constructor cannot be %<concept%>");
12338 return error_mark_node
;
12342 error_at (declspecs
->locations
[ds_concept
],
12343 "a concept cannot be a member function");
12347 if (TREE_CODE (unqualified_id
) == TEMPLATE_ID_EXPR
)
12349 tree tmpl
= TREE_OPERAND (unqualified_id
, 0);
12350 if (variable_template_p (tmpl
))
12352 error ("specialization of variable template %qD "
12353 "declared as function", tmpl
);
12354 inform (DECL_SOURCE_LOCATION (tmpl
),
12355 "variable template declared here");
12356 return error_mark_node
;
12360 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
12361 function_context
= (ctype
!= NULL_TREE
) ?
12362 decl_function_context (TYPE_MAIN_DECL (ctype
)) : NULL_TREE
;
12363 publicp
= (! friendp
|| ! staticp
)
12364 && function_context
== NULL_TREE
;
12366 decl
= grokfndecl (ctype
, type
,
12367 TREE_CODE (unqualified_id
) != TEMPLATE_ID_EXPR
12368 ? unqualified_id
: dname
,
12373 virtualp
, flags
, memfn_quals
, rqual
, raises
,
12374 friendp
? -1 : 0, friendp
, publicp
,
12375 inlinep
| (2 * constexpr_p
) | (4 * concept_p
),
12376 initialized
== SD_DELETED
, sfk
,
12377 funcdef_flag
, late_return_type_p
,
12378 template_count
, in_namespace
,
12379 attrlist
, declarator
->id_loc
);
12380 decl
= set_virt_specifiers (decl
, virt_specifiers
);
12381 if (decl
== NULL_TREE
)
12382 return error_mark_node
;
12384 /* This clobbers the attrs stored in `decl' from `attrlist'. */
12385 /* The decl and setting of decl_attr is also turned off. */
12386 decl
= build_decl_attribute_variant (decl
, decl_attr
);
12389 /* [class.conv.ctor]
12391 A constructor declared without the function-specifier
12392 explicit that can be called with a single parameter
12393 specifies a conversion from the type of its first
12394 parameter to the type of its class. Such a constructor
12395 is called a converting constructor. */
12396 if (explicitp
== 2)
12397 DECL_NONCONVERTING_P (decl
) = 1;
12399 if (declspecs
->explicit_specifier
)
12400 store_explicit_specifier (decl
, declspecs
->explicit_specifier
);
12402 else if (!staticp
&& !dependent_type_p (type
)
12403 && !COMPLETE_TYPE_P (complete_type (type
))
12404 && (!complete_or_array_type_p (type
)
12405 || initialized
== 0))
12407 if (TREE_CODE (type
) != ARRAY_TYPE
12408 || !COMPLETE_TYPE_P (TREE_TYPE (type
)))
12410 if (unqualified_id
)
12412 error ("field %qD has incomplete type %qT",
12413 unqualified_id
, type
);
12414 cxx_incomplete_type_inform (strip_array_types (type
));
12417 error ("name %qT has incomplete type", type
);
12419 type
= error_mark_node
;
12427 error ("%qE is neither function nor member function; "
12428 "cannot be declared friend", unqualified_id
);
12429 return error_mark_node
;
12436 /* Friends are treated specially. */
12437 if (ctype
== current_class_type
)
12438 ; /* We already issued a permerror. */
12439 else if (decl
&& DECL_NAME (decl
))
12441 if (template_class_depth (current_class_type
) == 0)
12443 decl
= check_explicit_specialization
12444 (unqualified_id
, decl
, template_count
,
12445 2 * funcdef_flag
+ 4);
12446 if (decl
== error_mark_node
)
12447 return error_mark_node
;
12450 decl
= do_friend (ctype
, unqualified_id
, decl
,
12456 return error_mark_node
;
12459 /* Structure field. It may not be a function, except for C++. */
12461 if (decl
== NULL_TREE
)
12465 /* C++ allows static class members. All other work
12466 for this is done by grokfield. */
12467 decl
= build_lang_decl_loc (declarator
12468 ? declarator
->id_loc
12470 VAR_DECL
, unqualified_id
, type
);
12471 set_linkage_for_static_data_member (decl
);
12473 error_at (declspecs
->locations
[ds_concept
],
12474 "static data member %qE declared %<concept%>",
12476 else if (constexpr_p
&& !initialized
)
12478 error ("%<constexpr%> static data member %qD must have an "
12479 "initializer", decl
);
12480 constexpr_p
= false;
12484 mark_inline_variable (decl
, declspecs
->locations
[ds_inline
]);
12486 if (!DECL_VAR_DECLARED_INLINE_P (decl
)
12487 && !(cxx_dialect
>= cxx17
&& constexpr_p
))
12488 /* Even if there is an in-class initialization, DECL
12489 is considered undefined until an out-of-class
12490 definition is provided, unless this is an inline
12492 DECL_EXTERNAL (decl
) = 1;
12496 CP_DECL_THREAD_LOCAL_P (decl
) = true;
12497 if (!processing_template_decl
)
12498 set_decl_tls_model (decl
, decl_default_tls_model (decl
));
12499 if (declspecs
->gnu_thread_keyword_p
)
12500 SET_DECL_GNU_TLS_P (decl
);
12506 error_at (declspecs
->locations
[ds_concept
],
12507 "non-static data member %qE declared %<concept%>",
12509 else if (constexpr_p
)
12511 error_at (declspecs
->locations
[ds_constexpr
],
12512 "non-static data member %qE declared %<constexpr%>",
12514 constexpr_p
= false;
12516 decl
= build_decl (input_location
,
12517 FIELD_DECL
, unqualified_id
, type
);
12518 DECL_NONADDRESSABLE_P (decl
) = bitfield
;
12519 if (bitfield
&& !unqualified_id
)
12521 TREE_NO_WARNING (decl
) = 1;
12522 DECL_PADDING_P (decl
) = 1;
12525 if (storage_class
== sc_mutable
)
12527 DECL_MUTABLE_P (decl
) = 1;
12528 storage_class
= sc_none
;
12533 /* An attempt is being made to initialize a non-static
12534 member. This is new in C++11. */
12535 maybe_warn_cpp0x (CPP0X_NSDMI
);
12537 /* If this has been parsed with static storage class, but
12538 errors forced staticp to be cleared, ensure NSDMI is
12540 if (declspecs
->storage_class
== sc_static
)
12541 DECL_INITIAL (decl
) = error_mark_node
;
12545 bad_specifiers (decl
, BSP_FIELD
, virtualp
,
12546 memfn_quals
!= TYPE_UNQUALIFIED
,
12547 staticp
? false : inlinep
, friendp
,
12548 raises
!= NULL_TREE
,
12549 declspecs
->locations
);
12552 else if (TREE_CODE (type
) == FUNCTION_TYPE
12553 || TREE_CODE (type
) == METHOD_TYPE
)
12555 tree original_name
;
12558 if (!unqualified_id
)
12559 return error_mark_node
;
12561 if (TREE_CODE (unqualified_id
) == TEMPLATE_ID_EXPR
)
12562 original_name
= dname
;
12564 original_name
= unqualified_id
;
12565 // FIXME:gcc_assert (original_name == dname);
12567 if (storage_class
== sc_auto
)
12568 error ("storage class %<auto%> invalid for function %qs", name
);
12569 else if (storage_class
== sc_register
)
12570 error ("storage class %<register%> invalid for function %qs", name
);
12573 if (declspecs
->gnu_thread_keyword_p
)
12574 error_at (declspecs
->locations
[ds_thread
],
12575 "storage class %<__thread%> invalid for function %qs",
12578 error_at (declspecs
->locations
[ds_thread
],
12579 "storage class %<thread_local%> invalid for "
12580 "function %qs", name
);
12583 if (virt_specifiers
)
12584 error ("virt-specifiers in %qs not allowed outside a class "
12585 "definition", name
);
12586 /* Function declaration not at top level.
12587 Storage classes other than `extern' are not allowed
12588 and `extern' makes no difference. */
12589 if (! toplevel_bindings_p ()
12590 && (storage_class
== sc_static
12591 || decl_spec_seq_has_spec_p (declspecs
, ds_inline
))
12594 if (storage_class
== sc_static
)
12595 pedwarn (declspecs
->locations
[ds_storage_class
], OPT_Wpedantic
,
12596 "%<static%> specifier invalid for function %qs "
12597 "declared out of global scope", name
);
12599 pedwarn (declspecs
->locations
[ds_inline
], OPT_Wpedantic
,
12600 "%<inline%> specifier invalid for function %qs "
12601 "declared out of global scope", name
);
12604 if (ctype
== NULL_TREE
)
12608 error ("virtual non-class function %qs", name
);
12611 else if (sfk
== sfk_constructor
12612 || sfk
== sfk_destructor
)
12614 error (funcdef_flag
12615 ? G_("%qs defined in a non-class scope")
12616 : G_("%qs declared in a non-class scope"), name
);
12621 /* Record whether the function is public. */
12622 publicp
= (ctype
!= NULL_TREE
12623 || storage_class
!= sc_static
);
12625 decl
= grokfndecl (ctype
, type
, original_name
, parms
, unqualified_id
,
12627 reqs
, virtualp
, flags
, memfn_quals
, rqual
, raises
,
12630 inlinep
| (2 * constexpr_p
) | (4 * concept_p
),
12631 initialized
== SD_DELETED
,
12634 late_return_type_p
,
12635 template_count
, in_namespace
, attrlist
,
12636 declarator
->id_loc
);
12637 if (decl
== NULL_TREE
)
12638 return error_mark_node
;
12640 if (explicitp
== 2)
12641 DECL_NONCONVERTING_P (decl
) = 1;
12644 int invalid_static
= 0;
12646 /* Don't allow a static member function in a class, and forbid
12647 declaring main to be static. */
12648 if (TREE_CODE (type
) == METHOD_TYPE
)
12650 permerror (input_location
, "cannot declare member function %qD to have "
12651 "static linkage", decl
);
12652 invalid_static
= 1;
12654 else if (current_function_decl
)
12656 /* 7.1.1: There can be no static function declarations within a
12658 error_at (declspecs
->locations
[ds_storage_class
],
12659 "cannot declare static function inside another function");
12660 invalid_static
= 1;
12663 if (invalid_static
)
12666 storage_class
= sc_none
;
12672 /* It's a variable. */
12674 /* An uninitialized decl with `extern' is a reference. */
12675 decl
= grokvardecl (type
, dname
, unqualified_id
,
12682 ctype
? ctype
: in_namespace
);
12683 if (decl
== NULL_TREE
)
12684 return error_mark_node
;
12686 bad_specifiers (decl
, BSP_VAR
, virtualp
,
12687 memfn_quals
!= TYPE_UNQUALIFIED
,
12688 inlinep
, friendp
, raises
!= NULL_TREE
,
12689 declspecs
->locations
);
12693 DECL_CONTEXT (decl
) = ctype
;
12696 permerror (input_location
, "%<static%> may not be used when defining "
12697 "(as opposed to declaring) a static data member");
12699 storage_class
= sc_none
;
12701 if (storage_class
== sc_register
&& TREE_STATIC (decl
))
12703 error ("static member %qD declared %<register%>", decl
);
12704 storage_class
= sc_none
;
12706 if (storage_class
== sc_extern
&& pedantic
)
12708 pedwarn (input_location
, OPT_Wpedantic
,
12709 "cannot explicitly declare member %q#D to have "
12710 "extern linkage", decl
);
12711 storage_class
= sc_none
;
12714 else if (constexpr_p
&& DECL_EXTERNAL (decl
))
12716 error ("declaration of %<constexpr%> variable %qD "
12717 "is not a definition", decl
);
12718 constexpr_p
= false;
12722 mark_inline_variable (decl
, declspecs
->locations
[ds_inline
]);
12723 if (innermost_code
== cdk_decomp
)
12725 gcc_assert (declarator
&& declarator
->kind
== cdk_decomp
);
12726 DECL_SOURCE_LOCATION (decl
) = declarator
->id_loc
;
12727 DECL_ARTIFICIAL (decl
) = 1;
12728 fit_decomposition_lang_decl (decl
, NULL_TREE
);
12732 if (VAR_P (decl
) && !initialized
)
12733 if (tree auto_node
= type_uses_auto (type
))
12734 if (!CLASS_PLACEHOLDER_TEMPLATE (auto_node
))
12736 location_t loc
= declspecs
->locations
[ds_type_spec
];
12737 error_at (loc
, "declaration of %q#D has no initializer", decl
);
12738 TREE_TYPE (decl
) = error_mark_node
;
12741 if (storage_class
== sc_extern
&& initialized
&& !funcdef_flag
)
12743 if (toplevel_bindings_p ())
12745 /* It's common practice (and completely valid) to have a const
12746 be initialized and declared extern. */
12747 if (!(type_quals
& TYPE_QUAL_CONST
))
12748 warning (0, "%qs initialized and declared %<extern%>", name
);
12752 error ("%qs has both %<extern%> and initializer", name
);
12753 return error_mark_node
;
12757 /* Record `register' declaration for warnings on &
12758 and in case doing stupid register allocation. */
12760 if (storage_class
== sc_register
)
12762 DECL_REGISTER (decl
) = 1;
12763 /* Warn about register storage specifiers on PARM_DECLs. */
12764 if (TREE_CODE (decl
) == PARM_DECL
)
12766 if (cxx_dialect
>= cxx17
)
12767 pedwarn (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
12768 "ISO C++17 does not allow %<register%> storage "
12769 "class specifier");
12771 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wregister
,
12772 "%<register%> storage class specifier used");
12775 else if (storage_class
== sc_extern
)
12776 DECL_THIS_EXTERN (decl
) = 1;
12777 else if (storage_class
== sc_static
)
12778 DECL_THIS_STATIC (decl
) = 1;
12780 /* Set constexpr flag on vars (functions got it in grokfndecl). */
12781 if (constexpr_p
&& VAR_P (decl
))
12782 DECL_DECLARED_CONSTEXPR_P (decl
) = true;
12784 /* Record constancy and volatility on the DECL itself . There's
12785 no need to do this when processing a template; we'll do this
12786 for the instantiated declaration based on the type of DECL. */
12787 if (!processing_template_decl
)
12788 cp_apply_type_quals_to_decl (type_quals
, decl
);
12794 /* Subroutine of start_function. Ensure that each of the parameter
12795 types (as listed in PARMS) is complete, as is required for a
12796 function definition. */
12799 require_complete_types_for_parms (tree parms
)
12801 for (; parms
; parms
= DECL_CHAIN (parms
))
12803 if (dependent_type_p (TREE_TYPE (parms
)))
12805 if (!VOID_TYPE_P (TREE_TYPE (parms
))
12806 && complete_type_or_else (TREE_TYPE (parms
), parms
))
12808 relayout_decl (parms
);
12809 DECL_ARG_TYPE (parms
) = type_passed_as (TREE_TYPE (parms
));
12811 maybe_warn_parm_abi (TREE_TYPE (parms
),
12812 DECL_SOURCE_LOCATION (parms
));
12815 /* grokparms or complete_type_or_else will have already issued
12817 TREE_TYPE (parms
) = error_mark_node
;
12821 /* Returns nonzero if T is a local variable. */
12824 local_variable_p (const_tree t
)
12827 /* A VAR_DECL with a context that is a _TYPE is a static data
12829 && !TYPE_P (CP_DECL_CONTEXT (t
))
12830 /* Any other non-local variable must be at namespace scope. */
12831 && !DECL_NAMESPACE_SCOPE_P (t
))
12832 || (TREE_CODE (t
) == PARM_DECL
))
12838 /* Like local_variable_p, but suitable for use as a tree-walking
12842 local_variable_p_walkfn (tree
*tp
, int *walk_subtrees
,
12845 if (local_variable_p (*tp
)
12846 && (!DECL_ARTIFICIAL (*tp
) || DECL_NAME (*tp
) == this_identifier
))
12848 else if (TYPE_P (*tp
))
12849 *walk_subtrees
= 0;
12854 /* Check that ARG, which is a default-argument expression for a
12855 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
12856 something goes wrong. DECL may also be a _TYPE node, rather than a
12857 DECL, if there is no DECL available. */
12860 check_default_argument (tree decl
, tree arg
, tsubst_flags_t complain
)
12865 if (TREE_CODE (arg
) == DEFAULT_ARG
)
12866 /* We get a DEFAULT_ARG when looking at an in-class declaration
12867 with a default argument. Ignore the argument for now; we'll
12868 deal with it after the class is complete. */
12877 decl_type
= TREE_TYPE (decl
);
12879 if (arg
== error_mark_node
12880 || decl
== error_mark_node
12881 || TREE_TYPE (arg
) == error_mark_node
12882 || decl_type
== error_mark_node
)
12883 /* Something already went wrong. There's no need to check
12885 return error_mark_node
;
12887 /* [dcl.fct.default]
12889 A default argument expression is implicitly converted to the
12891 ++cp_unevaluated_operand
;
12892 /* Avoid digest_init clobbering the initializer. */
12893 tree carg
= BRACE_ENCLOSED_INITIALIZER_P (arg
) ? unshare_expr (arg
): arg
;
12894 perform_implicit_conversion_flags (decl_type
, carg
, complain
,
12896 --cp_unevaluated_operand
;
12898 /* Avoid redundant -Wzero-as-null-pointer-constant warnings at
12900 if (TYPE_PTR_OR_PTRMEM_P (decl_type
)
12901 && null_ptr_cst_p (arg
))
12902 return nullptr_node
;
12904 /* [dcl.fct.default]
12906 Local variables shall not be used in default argument
12909 The keyword `this' shall not be used in a default argument of a
12910 member function. */
12911 var
= cp_walk_tree_without_duplicates (&arg
, local_variable_p_walkfn
, NULL
);
12914 if (complain
& tf_warning_or_error
)
12916 if (DECL_NAME (var
) == this_identifier
)
12917 permerror (input_location
, "default argument %qE uses %qD",
12920 error ("default argument %qE uses local variable %qD", arg
, var
);
12922 return error_mark_node
;
12929 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
12932 type_is_deprecated (tree type
)
12934 enum tree_code code
;
12935 if (TREE_DEPRECATED (type
))
12937 if (TYPE_NAME (type
))
12939 if (TREE_DEPRECATED (TYPE_NAME (type
)))
12945 /* Do warn about using typedefs to a deprecated class. */
12946 if (OVERLOAD_TYPE_P (type
) && type
!= TYPE_MAIN_VARIANT (type
))
12947 return type_is_deprecated (TYPE_MAIN_VARIANT (type
));
12949 code
= TREE_CODE (type
);
12951 if (code
== POINTER_TYPE
|| code
== REFERENCE_TYPE
12952 || code
== OFFSET_TYPE
|| code
== FUNCTION_TYPE
12953 || code
== METHOD_TYPE
|| code
== ARRAY_TYPE
)
12954 return type_is_deprecated (TREE_TYPE (type
));
12956 if (TYPE_PTRMEMFUNC_P (type
))
12957 return type_is_deprecated
12958 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type
))));
12963 /* Decode the list of parameter types for a function type.
12964 Given the list of things declared inside the parens,
12965 return a list of types.
12967 If this parameter does not end with an ellipsis, we append
12970 *PARMS is set to the chain of PARM_DECLs created. */
12973 grokparms (tree parmlist
, tree
*parms
)
12975 tree result
= NULL_TREE
;
12976 tree decls
= NULL_TREE
;
12980 for (parm
= parmlist
; parm
!= NULL_TREE
; parm
= TREE_CHAIN (parm
))
12982 tree type
= NULL_TREE
;
12983 tree init
= TREE_PURPOSE (parm
);
12984 tree decl
= TREE_VALUE (parm
);
12986 if (parm
== void_list_node
)
12989 if (! decl
|| TREE_TYPE (decl
) == error_mark_node
)
12992 type
= TREE_TYPE (decl
);
12993 if (VOID_TYPE_P (type
))
12995 if (same_type_p (type
, void_type_node
)
12997 && !DECL_NAME (decl
) && !result
12998 && TREE_CHAIN (parm
) == void_list_node
)
12999 /* DR 577: A parameter list consisting of a single
13000 unnamed parameter of non-dependent type 'void'. */
13002 else if (cv_qualified_p (type
))
13003 error_at (DECL_SOURCE_LOCATION (decl
),
13004 "invalid use of cv-qualified type %qT in "
13005 "parameter declaration", type
);
13007 error_at (DECL_SOURCE_LOCATION (decl
),
13008 "invalid use of type %<void%> in parameter "
13010 /* It's not a good idea to actually create parameters of
13011 type `void'; other parts of the compiler assume that a
13012 void type terminates the parameter list. */
13013 type
= error_mark_node
;
13014 TREE_TYPE (decl
) = error_mark_node
;
13017 if (type
!= error_mark_node
)
13019 if (deprecated_state
!= DEPRECATED_SUPPRESS
)
13021 tree deptype
= type_is_deprecated (type
);
13023 cp_warn_deprecated_use (deptype
);
13026 /* Top-level qualifiers on the parameters are
13027 ignored for function types. */
13028 type
= cp_build_qualified_type (type
, 0);
13029 if (TREE_CODE (type
) == METHOD_TYPE
)
13031 error ("parameter %qD invalidly declared method type", decl
);
13032 type
= build_pointer_type (type
);
13033 TREE_TYPE (decl
) = type
;
13035 else if (abstract_virtuals_error (decl
, type
))
13036 any_error
= 1; /* Seems like a good idea. */
13037 else if (cxx_dialect
< cxx17
&& INDIRECT_TYPE_P (type
))
13039 /* Before C++17 DR 393:
13040 [dcl.fct]/6, parameter types cannot contain pointers
13041 (references) to arrays of unknown bound. */
13042 tree t
= TREE_TYPE (type
);
13043 int ptr
= TYPE_PTR_P (type
);
13047 if (TYPE_PTR_P (t
))
13049 else if (TREE_CODE (t
) != ARRAY_TYPE
)
13051 else if (!TYPE_DOMAIN (t
))
13055 if (TREE_CODE (t
) == ARRAY_TYPE
)
13056 pedwarn (DECL_SOURCE_LOCATION (decl
), OPT_Wpedantic
,
13058 ? G_("parameter %qD includes pointer to array of "
13059 "unknown bound %qT")
13060 : G_("parameter %qD includes reference to array of "
13061 "unknown bound %qT"),
13067 else if (init
&& !processing_template_decl
)
13068 init
= check_default_argument (decl
, init
, tf_warning_or_error
);
13071 DECL_CHAIN (decl
) = decls
;
13073 result
= tree_cons (init
, type
, result
);
13075 decls
= nreverse (decls
);
13076 result
= nreverse (result
);
13078 result
= chainon (result
, void_list_node
);
13085 /* D is a constructor or overloaded `operator='.
13087 Let T be the class in which D is declared. Then, this function
13090 -1 if D's is an ill-formed constructor or copy assignment operator
13091 whose first parameter is of type `T'.
13092 0 if D is not a copy constructor or copy assignment
13094 1 if D is a copy constructor or copy assignment operator whose
13095 first parameter is a reference to non-const qualified T.
13096 2 if D is a copy constructor or copy assignment operator whose
13097 first parameter is a reference to const qualified T.
13099 This function can be used as a predicate. Positive values indicate
13100 a copy constructor and nonzero values indicate a copy assignment
13104 copy_fn_p (const_tree d
)
13110 gcc_assert (DECL_FUNCTION_MEMBER_P (d
));
13112 if (TREE_CODE (d
) == TEMPLATE_DECL
13113 || (DECL_TEMPLATE_INFO (d
)
13114 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d
))))
13115 /* Instantiations of template member functions are never copy
13116 functions. Note that member functions of templated classes are
13117 represented as template functions internally, and we must
13118 accept those as copy functions. */
13121 args
= FUNCTION_FIRST_USER_PARMTYPE (d
);
13125 arg_type
= TREE_VALUE (args
);
13126 if (arg_type
== error_mark_node
)
13129 if (TYPE_MAIN_VARIANT (arg_type
) == DECL_CONTEXT (d
))
13131 /* Pass by value copy assignment operator. */
13134 else if (TYPE_REF_P (arg_type
)
13135 && !TYPE_REF_IS_RVALUE (arg_type
)
13136 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type
)) == DECL_CONTEXT (d
))
13138 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type
)))
13144 args
= TREE_CHAIN (args
);
13146 if (args
&& args
!= void_list_node
&& !TREE_PURPOSE (args
))
13147 /* There are more non-optional args. */
13153 /* D is a constructor or overloaded `operator='.
13155 Let T be the class in which D is declared. Then, this function
13156 returns true when D is a move constructor or move assignment
13157 operator, false otherwise. */
13160 move_fn_p (const_tree d
)
13162 gcc_assert (DECL_FUNCTION_MEMBER_P (d
));
13164 if (cxx_dialect
== cxx98
)
13165 /* There are no move constructors if we are in C++98 mode. */
13168 if (TREE_CODE (d
) == TEMPLATE_DECL
13169 || (DECL_TEMPLATE_INFO (d
)
13170 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d
))))
13171 /* Instantiations of template member functions are never move
13172 functions. Note that member functions of templated classes are
13173 represented as template functions internally, and we must
13174 accept those as move functions. */
13177 return move_signature_fn_p (d
);
13180 /* D is a constructor or overloaded `operator='.
13182 Then, this function returns true when D has the same signature as a move
13183 constructor or move assignment operator (because either it is such a
13184 ctor/op= or it is a template specialization with the same signature),
13185 false otherwise. */
13188 move_signature_fn_p (const_tree d
)
13192 bool result
= false;
13194 args
= FUNCTION_FIRST_USER_PARMTYPE (d
);
13198 arg_type
= TREE_VALUE (args
);
13199 if (arg_type
== error_mark_node
)
13202 if (TYPE_REF_P (arg_type
)
13203 && TYPE_REF_IS_RVALUE (arg_type
)
13204 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type
)),
13208 args
= TREE_CHAIN (args
);
13210 if (args
&& args
!= void_list_node
&& !TREE_PURPOSE (args
))
13211 /* There are more non-optional args. */
13217 /* Remember any special properties of member function DECL. */
13220 grok_special_member_properties (tree decl
)
13224 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl
))
13227 class_type
= DECL_CONTEXT (decl
);
13228 if (IDENTIFIER_CTOR_P (DECL_NAME (decl
)))
13230 int ctor
= copy_fn_p (decl
);
13232 if (!DECL_ARTIFICIAL (decl
))
13233 TYPE_HAS_USER_CONSTRUCTOR (class_type
) = 1;
13239 A non-template constructor for class X is a copy
13240 constructor if its first parameter is of type X&, const
13241 X&, volatile X& or const volatile X&, and either there
13242 are no other parameters or else all other parameters have
13243 default arguments. */
13244 TYPE_HAS_COPY_CTOR (class_type
) = 1;
13245 if (user_provided_p (decl
))
13246 TYPE_HAS_COMPLEX_COPY_CTOR (class_type
) = 1;
13248 TYPE_HAS_CONST_COPY_CTOR (class_type
) = 1;
13250 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl
)))
13251 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type
) = 1;
13252 else if (move_fn_p (decl
) && user_provided_p (decl
))
13253 TYPE_HAS_COMPLEX_MOVE_CTOR (class_type
) = 1;
13254 else if (is_list_ctor (decl
))
13255 TYPE_HAS_LIST_CTOR (class_type
) = 1;
13257 if (DECL_DECLARED_CONSTEXPR_P (decl
)
13258 && !ctor
&& !move_fn_p (decl
))
13259 TYPE_HAS_CONSTEXPR_CTOR (class_type
) = 1;
13261 else if (DECL_NAME (decl
) == assign_op_identifier
)
13265 A non-template assignment operator for class X is a copy
13266 assignment operator if its parameter is of type X, X&, const
13267 X&, volatile X& or const volatile X&. */
13269 int assop
= copy_fn_p (decl
);
13273 TYPE_HAS_COPY_ASSIGN (class_type
) = 1;
13274 if (user_provided_p (decl
))
13275 TYPE_HAS_COMPLEX_COPY_ASSIGN (class_type
) = 1;
13277 TYPE_HAS_CONST_COPY_ASSIGN (class_type
) = 1;
13279 else if (move_fn_p (decl
) && user_provided_p (decl
))
13280 TYPE_HAS_COMPLEX_MOVE_ASSIGN (class_type
) = 1;
13282 else if (IDENTIFIER_CONV_OP_P (DECL_NAME (decl
)))
13283 TYPE_HAS_CONVERSION (class_type
) = true;
13285 /* Destructors are handled in check_methods. */
13288 /* Check a constructor DECL has the correct form. Complains
13289 if the class has a constructor of the form X(X). */
13292 grok_ctor_properties (const_tree ctype
, const_tree decl
)
13294 int ctor_parm
= copy_fn_p (decl
);
13300 A declaration of a constructor for a class X is ill-formed if
13301 its first parameter is of type (optionally cv-qualified) X
13302 and either there are no other parameters or else all other
13303 parameters have default arguments.
13305 We *don't* complain about member template instantiations that
13306 have this form, though; they can occur as we try to decide
13307 what constructor to use during overload resolution. Since
13308 overload resolution will never prefer such a constructor to
13309 the non-template copy constructor (which is either explicitly
13310 or implicitly defined), there's no need to worry about their
13311 existence. Theoretically, they should never even be
13312 instantiated, but that's hard to forestall. */
13313 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
13321 /* DECL is a declaration for an overloaded or conversion operator. If
13322 COMPLAIN is true, errors are issued for invalid declarations. */
13325 grok_op_properties (tree decl
, bool complain
)
13327 tree argtypes
= TYPE_ARG_TYPES (TREE_TYPE (decl
));
13328 bool methodp
= TREE_CODE (TREE_TYPE (decl
)) == METHOD_TYPE
;
13329 tree name
= DECL_NAME (decl
);
13330 location_t loc
= DECL_SOURCE_LOCATION (decl
);
13332 tree class_type
= DECL_CONTEXT (decl
);
13333 if (class_type
&& !CLASS_TYPE_P (class_type
))
13334 class_type
= NULL_TREE
;
13336 tree_code operator_code
;
13338 if (IDENTIFIER_CONV_OP_P (name
))
13340 /* Conversion operators are TYPE_EXPR for the purposes of this
13342 operator_code
= TYPE_EXPR
;
13343 op_flags
= OVL_OP_FLAG_UNARY
;
13347 const ovl_op_info_t
*ovl_op
= IDENTIFIER_OVL_OP_INFO (name
);
13349 operator_code
= ovl_op
->tree_code
;
13350 op_flags
= ovl_op
->flags
;
13351 gcc_checking_assert (operator_code
!= ERROR_MARK
);
13352 DECL_OVERLOADED_OPERATOR_CODE_RAW (decl
) = ovl_op
->ovl_op_code
;
13355 if (op_flags
& OVL_OP_FLAG_ALLOC
)
13357 /* operator new and operator delete are quite special. */
13361 case OVL_OP_FLAG_ALLOC
:
13362 TYPE_HAS_NEW_OPERATOR (class_type
) = 1;
13365 case OVL_OP_FLAG_ALLOC
| OVL_OP_FLAG_DELETE
:
13366 TYPE_GETS_DELETE (class_type
) |= 1;
13369 case OVL_OP_FLAG_ALLOC
| OVL_OP_FLAG_VEC
:
13370 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type
) = 1;
13373 case OVL_OP_FLAG_ALLOC
| OVL_OP_FLAG_DELETE
| OVL_OP_FLAG_VEC
:
13374 TYPE_GETS_DELETE (class_type
) |= 2;
13378 gcc_unreachable ();
13381 /* [basic.std.dynamic.allocation]/1:
13383 A program is ill-formed if an allocation function is declared
13384 in a namespace scope other than global scope or declared
13385 static in global scope.
13387 The same also holds true for deallocation functions. */
13388 if (DECL_NAMESPACE_SCOPE_P (decl
))
13390 if (CP_DECL_CONTEXT (decl
) != global_namespace
)
13392 error_at (loc
, "%qD may not be declared within a namespace",
13397 if (!TREE_PUBLIC (decl
))
13399 error_at (loc
, "%qD may not be declared as static", decl
);
13404 if (op_flags
& OVL_OP_FLAG_DELETE
)
13405 TREE_TYPE (decl
) = coerce_delete_type (TREE_TYPE (decl
), loc
);
13408 DECL_IS_OPERATOR_NEW (decl
) = 1;
13409 TREE_TYPE (decl
) = coerce_new_type (TREE_TYPE (decl
), loc
);
13415 /* An operator function must either be a non-static member function
13416 or have at least one parameter of a class, a reference to a class,
13417 an enumeration, or a reference to an enumeration. 13.4.0.6 */
13418 if (! methodp
|| DECL_STATIC_FUNCTION_P (decl
))
13420 if (operator_code
== TYPE_EXPR
13421 || operator_code
== CALL_EXPR
13422 || operator_code
== COMPONENT_REF
13423 || operator_code
== ARRAY_REF
13424 || operator_code
== NOP_EXPR
)
13426 error_at (loc
, "%qD must be a nonstatic member function", decl
);
13430 if (DECL_STATIC_FUNCTION_P (decl
))
13432 error_at (loc
, "%qD must be either a non-static member "
13433 "function or a non-member function", decl
);
13437 for (tree arg
= argtypes
; ; arg
= TREE_CHAIN (arg
))
13439 if (!arg
|| arg
== void_list_node
)
13442 error_at(loc
, "%qD must have an argument of class or "
13443 "enumerated type", decl
);
13447 tree type
= non_reference (TREE_VALUE (arg
));
13448 if (type
== error_mark_node
)
13451 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
13452 because these checks are performed even on template
13454 if (MAYBE_CLASS_TYPE_P (type
)
13455 || TREE_CODE (type
) == ENUMERAL_TYPE
)
13460 if (operator_code
== CALL_EXPR
)
13461 /* There are no further restrictions on the arguments to an overloaded
13465 if (operator_code
== COND_EXPR
)
13468 error_at (loc
, "ISO C++ prohibits overloading operator ?:");
13472 /* Count the number of arguments and check for ellipsis. */
13474 for (tree arg
= argtypes
; arg
!= void_list_node
; arg
= TREE_CHAIN (arg
))
13479 error_at (loc
, "%qD must not have variable number of arguments",
13486 /* Verify correct number of arguments. */
13489 case OVL_OP_FLAG_AMBIARY
:
13492 /* We have a unary instance of an ambi-ary op. Remap to the
13494 unsigned alt
= ovl_op_alternate
[ovl_op_mapping
[operator_code
]];
13495 const ovl_op_info_t
*ovl_op
= &ovl_op_info
[false][alt
];
13496 gcc_checking_assert (ovl_op
->flags
== OVL_OP_FLAG_UNARY
);
13497 operator_code
= ovl_op
->tree_code
;
13498 DECL_OVERLOADED_OPERATOR_CODE_RAW (decl
) = ovl_op
->ovl_op_code
;
13500 else if (arity
!= 2)
13502 /* This was an ambiguous operator but is invalid. */
13505 ? G_("%qD must have either zero or one argument")
13506 : G_("%qD must have either one or two arguments"), decl
);
13509 else if ((operator_code
== POSTINCREMENT_EXPR
13510 || operator_code
== POSTDECREMENT_EXPR
)
13511 && ! processing_template_decl
13512 /* x++ and x--'s second argument must be an int. */
13513 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes
)),
13514 integer_type_node
))
13518 ? G_("postfix %qD must have %<int%> as its argument")
13519 : G_("postfix %qD must have %<int%> as its second argument"),
13525 case OVL_OP_FLAG_UNARY
:
13530 ? G_("%qD must have no arguments")
13531 : G_("%qD must have exactly one argument"), decl
);
13536 case OVL_OP_FLAG_BINARY
:
13541 ? G_("%qD must have exactly one argument")
13542 : G_("%qD must have exactly two arguments"), decl
);
13548 gcc_unreachable ();
13551 /* There can be no default arguments. */
13552 for (tree arg
= argtypes
; arg
!= void_list_node
; arg
= TREE_CHAIN (arg
))
13553 if (TREE_PURPOSE (arg
))
13555 TREE_PURPOSE (arg
) = NULL_TREE
;
13556 error_at (loc
, "%qD cannot have default arguments", decl
);
13560 /* At this point the declaration is well-formed. It may not be
13561 sensible though. */
13563 /* Check member function warnings only on the in-class declaration.
13564 There's no point warning on an out-of-class definition. */
13565 if (class_type
&& class_type
!= current_class_type
)
13568 /* Warn about conversion operators that will never be used. */
13569 if (IDENTIFIER_CONV_OP_P (name
)
13570 && ! DECL_TEMPLATE_INFO (decl
)
13571 && warn_class_conversion
)
13573 tree t
= TREE_TYPE (name
);
13574 int ref
= TYPE_REF_P (t
);
13577 t
= TYPE_MAIN_VARIANT (TREE_TYPE (t
));
13579 if (VOID_TYPE_P (t
))
13580 warning_at (loc
, OPT_Wclass_conversion
, "converting %qT to %<void%> "
13581 "will never use a type conversion operator", class_type
);
13582 else if (class_type
)
13584 if (same_type_ignoring_top_level_qualifiers_p (t
, class_type
))
13585 warning_at (loc
, OPT_Wclass_conversion
,
13587 ? G_("converting %qT to a reference to the same type "
13588 "will never use a type conversion operator")
13589 : G_("converting %qT to the same type "
13590 "will never use a type conversion operator"),
13592 /* Don't force t to be complete here. */
13593 else if (MAYBE_CLASS_TYPE_P (t
)
13594 && COMPLETE_TYPE_P (t
)
13595 && DERIVED_FROM_P (t
, class_type
))
13596 warning_at (loc
, OPT_Wclass_conversion
,
13598 ? G_("converting %qT to a reference to a base class "
13599 "%qT will never use a type conversion operator")
13600 : G_("converting %qT to a base class %qT "
13601 "will never use a type conversion operator"),
13609 /* Effective C++ rules below. */
13611 /* More Effective C++ rule 7. */
13612 if (operator_code
== TRUTH_ANDIF_EXPR
13613 || operator_code
== TRUTH_ORIF_EXPR
13614 || operator_code
== COMPOUND_EXPR
)
13615 warning_at (loc
, OPT_Weffc__
,
13616 "user-defined %qD always evaluates both arguments", decl
);
13618 /* More Effective C++ rule 6. */
13619 if (operator_code
== POSTINCREMENT_EXPR
13620 || operator_code
== POSTDECREMENT_EXPR
13621 || operator_code
== PREINCREMENT_EXPR
13622 || operator_code
== PREDECREMENT_EXPR
)
13624 tree arg
= TREE_VALUE (argtypes
);
13625 tree ret
= TREE_TYPE (TREE_TYPE (decl
));
13626 if (methodp
|| TYPE_REF_P (arg
))
13627 arg
= TREE_TYPE (arg
);
13628 arg
= TYPE_MAIN_VARIANT (arg
);
13630 if (operator_code
== PREINCREMENT_EXPR
13631 || operator_code
== PREDECREMENT_EXPR
)
13633 if (!TYPE_REF_P (ret
)
13634 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret
)), arg
))
13635 warning_at (loc
, OPT_Weffc__
, "prefix %qD should return %qT", decl
,
13636 build_reference_type (arg
));
13640 if (!same_type_p (TYPE_MAIN_VARIANT (ret
), arg
))
13641 warning_at (loc
, OPT_Weffc__
,
13642 "postfix %qD should return %qT", decl
, arg
);
13646 /* Effective C++ rule 23. */
13647 if (!DECL_ASSIGNMENT_OPERATOR_P (decl
)
13648 && (operator_code
== PLUS_EXPR
13649 || operator_code
== MINUS_EXPR
13650 || operator_code
== TRUNC_DIV_EXPR
13651 || operator_code
== MULT_EXPR
13652 || operator_code
== TRUNC_MOD_EXPR
)
13653 && TYPE_REF_P (TREE_TYPE (TREE_TYPE (decl
))))
13654 warning_at (loc
, OPT_Weffc__
, "%qD should return by value", decl
);
13659 /* Return a string giving the keyword associate with CODE. */
13661 static const char *
13662 tag_name (enum tag_types code
)
13674 case typename_type
:
13677 gcc_unreachable ();
13681 /* Name lookup in an elaborated-type-specifier (after the keyword
13682 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
13683 elaborated-type-specifier is invalid, issue a diagnostic and return
13684 error_mark_node; otherwise, return the *_TYPE to which it referred.
13685 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
13688 check_elaborated_type_specifier (enum tag_types tag_code
,
13690 bool allow_template_p
)
13696 struct S { struct S *p; };
13698 name lookup will find the TYPE_DECL for the implicit "S::S"
13699 typedef. Adjust for that here. */
13700 if (DECL_SELF_REFERENCE_P (decl
))
13701 decl
= TYPE_NAME (TREE_TYPE (decl
));
13703 type
= TREE_TYPE (decl
);
13705 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
13706 is false for this case as well. */
13707 if (TREE_CODE (type
) == TEMPLATE_TYPE_PARM
)
13709 error ("using template type parameter %qT after %qs",
13710 type
, tag_name (tag_code
));
13711 return error_mark_node
;
13713 /* Accept template template parameters. */
13714 else if (allow_template_p
13715 && (TREE_CODE (type
) == BOUND_TEMPLATE_TEMPLATE_PARM
13716 || TREE_CODE (type
) == TEMPLATE_TEMPLATE_PARM
))
13720 If the identifier resolves to a typedef-name or the
13721 simple-template-id resolves to an alias template
13722 specialization, the elaborated-type-specifier is ill-formed.
13724 In other words, the only legitimate declaration to use in the
13725 elaborated type specifier is the implicit typedef created when
13726 the type is declared. */
13727 else if (!DECL_IMPLICIT_TYPEDEF_P (decl
)
13728 && !DECL_SELF_REFERENCE_P (decl
)
13729 && tag_code
!= typename_type
)
13731 if (alias_template_specialization_p (type
))
13732 error ("using alias template specialization %qT after %qs",
13733 type
, tag_name (tag_code
));
13735 error ("using typedef-name %qD after %qs", decl
, tag_name (tag_code
));
13736 inform (DECL_SOURCE_LOCATION (decl
),
13737 "%qD has a previous declaration here", decl
);
13738 return error_mark_node
;
13740 else if (TREE_CODE (type
) != RECORD_TYPE
13741 && TREE_CODE (type
) != UNION_TYPE
13742 && tag_code
!= enum_type
13743 && tag_code
!= typename_type
)
13745 error ("%qT referred to as %qs", type
, tag_name (tag_code
));
13746 inform (location_of (type
), "%qT has a previous declaration here", type
);
13747 return error_mark_node
;
13749 else if (TREE_CODE (type
) != ENUMERAL_TYPE
13750 && tag_code
== enum_type
)
13752 error ("%qT referred to as enum", type
);
13753 inform (location_of (type
), "%qT has a previous declaration here", type
);
13754 return error_mark_node
;
13756 else if (!allow_template_p
13757 && TREE_CODE (type
) == RECORD_TYPE
13758 && CLASSTYPE_IS_TEMPLATE (type
))
13760 /* If a class template appears as elaborated type specifier
13761 without a template header such as:
13763 template <class T> class C {};
13764 void f(class C); // No template header here
13766 then the required template argument is missing. */
13767 error ("template argument required for %<%s %T%>",
13768 tag_name (tag_code
),
13769 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type
)));
13770 return error_mark_node
;
13776 /* Lookup NAME in elaborate type specifier in scope according to
13777 SCOPE and issue diagnostics if necessary.
13778 Return *_TYPE node upon success, NULL_TREE when the NAME is not
13779 found, and ERROR_MARK_NODE for type error. */
13782 lookup_and_check_tag (enum tag_types tag_code
, tree name
,
13783 tag_scope scope
, bool template_header_p
)
13787 if (scope
== ts_global
)
13789 /* First try ordinary name lookup, ignoring hidden class name
13790 injected via friend declaration. */
13791 decl
= lookup_name_prefer_type (name
, 2);
13792 decl
= strip_using_decl (decl
);
13793 /* If that fails, the name will be placed in the smallest
13794 non-class, non-function-prototype scope according to 3.3.1/5.
13795 We may already have a hidden name declared as friend in this
13796 scope. So lookup again but not ignoring hidden names.
13797 If we find one, that name will be made visible rather than
13798 creating a new tag. */
13800 decl
= lookup_type_scope (name
, ts_within_enclosing_non_class
);
13803 decl
= lookup_type_scope (name
, scope
);
13806 && (DECL_CLASS_TEMPLATE_P (decl
)
13807 /* If scope is ts_current we're defining a class, so ignore a
13808 template template parameter. */
13809 || (scope
!= ts_current
13810 && DECL_TEMPLATE_TEMPLATE_PARM_P (decl
))))
13811 decl
= DECL_TEMPLATE_RESULT (decl
);
13813 if (decl
&& TREE_CODE (decl
) == TYPE_DECL
)
13815 /* Look for invalid nested type:
13819 if (scope
== ts_current
&& DECL_SELF_REFERENCE_P (decl
))
13821 error ("%qD has the same name as the class in which it is "
13824 return error_mark_node
;
13827 /* Two cases we need to consider when deciding if a class
13828 template is allowed as an elaborated type specifier:
13829 1. It is a self reference to its own class.
13830 2. It comes with a template header.
13834 template <class T> class C {
13835 class C *c1; // DECL_SELF_REFERENCE_P is true
13838 template <class U> class C; // template_header_p is true
13839 template <class T> class C<T>::D {
13840 class C *c2; // DECL_SELF_REFERENCE_P is true
13843 t
= check_elaborated_type_specifier (tag_code
,
13846 | DECL_SELF_REFERENCE_P (decl
));
13847 if (template_header_p
&& t
&& CLASS_TYPE_P (t
)
13848 && (!CLASSTYPE_TEMPLATE_INFO (t
)
13849 || (!PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t
)))))
13851 error ("%qT is not a template", t
);
13852 inform (location_of (t
), "previous declaration here");
13853 if (TYPE_CLASS_SCOPE_P (t
)
13854 && CLASSTYPE_TEMPLATE_INFO (TYPE_CONTEXT (t
)))
13855 inform (input_location
,
13856 "perhaps you want to explicitly add %<%T::%>",
13858 t
= error_mark_node
;
13863 else if (decl
&& TREE_CODE (decl
) == TREE_LIST
)
13865 error ("reference to %qD is ambiguous", name
);
13866 print_candidates (decl
);
13867 return error_mark_node
;
13873 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
13874 Define the tag as a forward-reference if it is not defined.
13876 If a declaration is given, process it here, and report an error if
13877 multiple declarations are not identical.
13879 SCOPE is TS_CURRENT when this is also a definition. Only look in
13880 the current frame for the name (since C++ allows new names in any
13881 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
13882 declaration. Only look beginning from the current scope outward up
13883 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
13885 TEMPLATE_HEADER_P is true when this declaration is preceded by
13886 a set of template parameters. */
13889 xref_tag_1 (enum tag_types tag_code
, tree name
,
13890 tag_scope scope
, bool template_header_p
)
13892 enum tree_code code
;
13893 tree context
= NULL_TREE
;
13895 gcc_assert (identifier_p (name
));
13901 code
= RECORD_TYPE
;
13907 code
= ENUMERAL_TYPE
;
13910 gcc_unreachable ();
13913 /* In case of anonymous name, xref_tag is only called to
13914 make type node and push name. Name lookup is not required. */
13915 tree t
= NULL_TREE
;
13916 if (scope
!= ts_lambda
&& !anon_aggrname_p (name
))
13917 t
= lookup_and_check_tag (tag_code
, name
, scope
, template_header_p
);
13919 if (t
== error_mark_node
)
13920 return error_mark_node
;
13922 if (scope
!= ts_current
&& t
&& current_class_type
13923 && template_class_depth (current_class_type
)
13924 && template_header_p
)
13926 if (TREE_CODE (t
) == TEMPLATE_TEMPLATE_PARM
)
13929 /* Since SCOPE is not TS_CURRENT, we are not looking at a
13930 definition of this tag. Since, in addition, we are currently
13931 processing a (member) template declaration of a template
13932 class, we must be very careful; consider:
13934 template <class X> struct S1
13936 template <class U> struct S2
13938 template <class V> friend struct S1;
13941 Here, the S2::S1 declaration should not be confused with the
13942 outer declaration. In particular, the inner version should
13943 have a template parameter of level 2, not level 1.
13945 On the other hand, when presented with:
13947 template <class T> struct S1
13949 template <class U> struct S2 {};
13950 template <class U> friend struct S2;
13953 the friend must find S1::S2 eventually. We accomplish this
13954 by making sure that the new type we create to represent this
13955 declaration has the right TYPE_CONTEXT. */
13956 context
= TYPE_CONTEXT (t
);
13962 /* If no such tag is yet defined, create a forward-reference node
13963 and record it as the "definition".
13964 When a real declaration of this type is found,
13965 the forward-reference will be altered into a real type. */
13966 if (code
== ENUMERAL_TYPE
)
13968 error ("use of enum %q#D without previous declaration", name
);
13969 return error_mark_node
;
13973 t
= make_class_type (code
);
13974 TYPE_CONTEXT (t
) = context
;
13975 if (scope
== ts_lambda
)
13977 /* Mark it as a lambda type. */
13978 CLASSTYPE_LAMBDA_EXPR (t
) = error_mark_node
;
13979 /* And push it into current scope. */
13980 scope
= ts_current
;
13982 t
= pushtag (name
, t
, scope
);
13987 if (template_header_p
&& MAYBE_CLASS_TYPE_P (t
))
13989 /* Check that we aren't trying to overload a class with different
13991 tree constr
= NULL_TREE
;
13992 if (current_template_parms
)
13994 tree reqs
= TEMPLATE_PARMS_CONSTRAINTS (current_template_parms
);
13995 constr
= build_constraints (reqs
, NULL_TREE
);
13997 if (!redeclare_class_template (t
, current_template_parms
, constr
))
13998 return error_mark_node
;
14000 else if (!processing_template_decl
14001 && CLASS_TYPE_P (t
)
14002 && CLASSTYPE_IS_TEMPLATE (t
))
14004 error ("redeclaration of %qT as a non-template", t
);
14005 inform (location_of (t
), "previous declaration %qD", t
);
14006 return error_mark_node
;
14009 if (scope
!= ts_within_enclosing_non_class
&& TYPE_HIDDEN_P (t
))
14011 /* This is no longer an invisible friend. Make it
14013 tree decl
= TYPE_NAME (t
);
14015 DECL_ANTICIPATED (decl
) = false;
14016 DECL_FRIEND_P (decl
) = false;
14018 if (TYPE_TEMPLATE_INFO (t
))
14020 tree tmpl
= TYPE_TI_TEMPLATE (t
);
14021 DECL_ANTICIPATED (tmpl
) = false;
14022 DECL_FRIEND_P (tmpl
) = false;
14030 /* Wrapper for xref_tag_1. */
14033 xref_tag (enum tag_types tag_code
, tree name
,
14034 tag_scope scope
, bool template_header_p
)
14038 subtime
= timevar_cond_start (TV_NAME_LOOKUP
);
14039 ret
= xref_tag_1 (tag_code
, name
, scope
, template_header_p
);
14040 timevar_cond_stop (TV_NAME_LOOKUP
, subtime
);
14046 xref_tag_from_type (tree old
, tree id
, tag_scope scope
)
14048 enum tag_types tag_kind
;
14050 if (TREE_CODE (old
) == RECORD_TYPE
)
14051 tag_kind
= (CLASSTYPE_DECLARED_CLASS (old
) ? class_type
: record_type
);
14053 tag_kind
= union_type
;
14055 if (id
== NULL_TREE
)
14056 id
= TYPE_IDENTIFIER (old
);
14058 return xref_tag (tag_kind
, id
, scope
, false);
14061 /* Create the binfo hierarchy for REF with (possibly NULL) base list
14062 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
14063 access_* node, and the TREE_VALUE is the type of the base-class.
14064 Non-NULL TREE_TYPE indicates virtual inheritance. */
14067 xref_basetypes (tree ref
, tree base_list
)
14070 tree binfo
, base_binfo
;
14071 unsigned max_vbases
= 0; /* Maximum direct & indirect virtual bases. */
14072 unsigned max_bases
= 0; /* Maximum direct bases. */
14073 unsigned max_dvbases
= 0; /* Maximum direct virtual bases. */
14075 tree default_access
;
14076 tree igo_prev
; /* Track Inheritance Graph Order. */
14078 if (ref
== error_mark_node
)
14081 /* The base of a derived class is private by default, all others are
14083 default_access
= (TREE_CODE (ref
) == RECORD_TYPE
14084 && CLASSTYPE_DECLARED_CLASS (ref
)
14085 ? access_private_node
: access_public_node
);
14087 /* First, make sure that any templates in base-classes are
14088 instantiated. This ensures that if we call ourselves recursively
14089 we do not get confused about which classes are marked and which
14091 basep
= &base_list
;
14094 tree basetype
= TREE_VALUE (*basep
);
14096 /* The dependent_type_p call below should really be dependent_scope_p
14097 so that we give a hard error about using an incomplete type as a
14098 base, but we allow it with a pedwarn for backward
14100 if (processing_template_decl
14101 && CLASS_TYPE_P (basetype
) && TYPE_BEING_DEFINED (basetype
))
14102 cxx_incomplete_type_diagnostic (NULL_TREE
, basetype
, DK_PEDWARN
);
14103 if (!dependent_type_p (basetype
)
14104 && !complete_type_or_else (basetype
, NULL
))
14105 /* An incomplete type. Remove it from the list. */
14106 *basep
= TREE_CHAIN (*basep
);
14110 if (TREE_TYPE (*basep
))
14112 if (CLASS_TYPE_P (basetype
))
14113 max_vbases
+= vec_safe_length (CLASSTYPE_VBASECLASSES (basetype
));
14114 basep
= &TREE_CHAIN (*basep
);
14117 max_vbases
+= max_dvbases
;
14119 TYPE_MARKED_P (ref
) = 1;
14121 /* The binfo slot should be empty, unless this is an (ill-formed)
14123 gcc_assert (!TYPE_BINFO (ref
) || TYPE_SIZE (ref
));
14125 gcc_assert (TYPE_MAIN_VARIANT (ref
) == ref
);
14127 binfo
= make_tree_binfo (max_bases
);
14129 TYPE_BINFO (ref
) = binfo
;
14130 BINFO_OFFSET (binfo
) = size_zero_node
;
14131 BINFO_TYPE (binfo
) = ref
;
14133 /* Apply base-class info set up to the variants of this type. */
14134 fixup_type_variants (ref
);
14138 vec_alloc (BINFO_BASE_ACCESSES (binfo
), max_bases
);
14139 /* A C++98 POD cannot have base classes. */
14140 CLASSTYPE_NON_LAYOUT_POD_P (ref
) = true;
14142 if (TREE_CODE (ref
) == UNION_TYPE
)
14144 error ("derived union %qT invalid", ref
);
14150 warning (OPT_Wmultiple_inheritance
,
14151 "%qT defined with multiple direct bases", ref
);
14155 /* An aggregate can't have virtual base classes. */
14156 CLASSTYPE_NON_AGGREGATE (ref
) = true;
14158 vec_alloc (CLASSTYPE_VBASECLASSES (ref
), max_vbases
);
14161 warning (OPT_Wvirtual_inheritance
,
14162 "%qT defined with direct virtual base", ref
);
14165 for (igo_prev
= binfo
; base_list
; base_list
= TREE_CHAIN (base_list
))
14167 tree access
= TREE_PURPOSE (base_list
);
14168 int via_virtual
= TREE_TYPE (base_list
) != NULL_TREE
;
14169 tree basetype
= TREE_VALUE (base_list
);
14171 if (access
== access_default_node
)
14172 access
= default_access
;
14174 /* Before C++17, an aggregate cannot have base classes. In C++17, an
14175 aggregate can't have virtual, private, or protected base classes. */
14176 if (cxx_dialect
< cxx17
14177 || access
!= access_public_node
14179 CLASSTYPE_NON_AGGREGATE (ref
) = true;
14181 if (PACK_EXPANSION_P (basetype
))
14182 basetype
= PACK_EXPANSION_PATTERN (basetype
);
14183 if (TREE_CODE (basetype
) == TYPE_DECL
)
14184 basetype
= TREE_TYPE (basetype
);
14185 if (!MAYBE_CLASS_TYPE_P (basetype
) || TREE_CODE (basetype
) == UNION_TYPE
)
14187 error ("base type %qT fails to be a struct or class type",
14192 base_binfo
= NULL_TREE
;
14193 if (CLASS_TYPE_P (basetype
) && !dependent_scope_p (basetype
))
14195 base_binfo
= TYPE_BINFO (basetype
);
14196 /* The original basetype could have been a typedef'd type. */
14197 basetype
= BINFO_TYPE (base_binfo
);
14199 /* Inherit flags from the base. */
14200 TYPE_HAS_NEW_OPERATOR (ref
)
14201 |= TYPE_HAS_NEW_OPERATOR (basetype
);
14202 TYPE_HAS_ARRAY_NEW_OPERATOR (ref
)
14203 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype
);
14204 TYPE_GETS_DELETE (ref
) |= TYPE_GETS_DELETE (basetype
);
14205 TYPE_HAS_CONVERSION (ref
) |= TYPE_HAS_CONVERSION (basetype
);
14206 CLASSTYPE_DIAMOND_SHAPED_P (ref
)
14207 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype
);
14208 CLASSTYPE_REPEATED_BASE_P (ref
)
14209 |= CLASSTYPE_REPEATED_BASE_P (basetype
);
14212 /* We must do this test after we've seen through a typedef
14214 if (TYPE_MARKED_P (basetype
))
14216 if (basetype
== ref
)
14217 error ("recursive type %qT undefined", basetype
);
14219 error ("duplicate base type %qT invalid", basetype
);
14223 if (PACK_EXPANSION_P (TREE_VALUE (base_list
)))
14224 /* Regenerate the pack expansion for the bases. */
14225 basetype
= make_pack_expansion (basetype
);
14227 TYPE_MARKED_P (basetype
) = 1;
14229 base_binfo
= copy_binfo (base_binfo
, basetype
, ref
,
14230 &igo_prev
, via_virtual
);
14231 if (!BINFO_INHERITANCE_CHAIN (base_binfo
))
14232 BINFO_INHERITANCE_CHAIN (base_binfo
) = binfo
;
14234 BINFO_BASE_APPEND (binfo
, base_binfo
);
14235 BINFO_BASE_ACCESS_APPEND (binfo
, access
);
14239 /* Update max_vbases to reflect the reality that we are dropping
14240 this base: if it reaches zero we want to undo the vec_alloc
14241 above to avoid inconsistencies during error-recovery: eg, in
14242 build_special_member_call, CLASSTYPE_VBASECLASSES non null
14243 and vtt null (c++/27952). */
14246 if (CLASS_TYPE_P (basetype
))
14248 -= vec_safe_length (CLASSTYPE_VBASECLASSES (basetype
));
14251 if (CLASSTYPE_VBASECLASSES (ref
)
14252 && max_vbases
== 0)
14253 vec_free (CLASSTYPE_VBASECLASSES (ref
));
14255 if (vec_safe_length (CLASSTYPE_VBASECLASSES (ref
)) < max_vbases
)
14256 /* If we didn't get max_vbases vbases, we must have shared at
14257 least one of them, and are therefore diamond shaped. */
14258 CLASSTYPE_DIAMOND_SHAPED_P (ref
) = 1;
14260 /* Unmark all the types. */
14261 for (i
= 0; BINFO_BASE_ITERATE (binfo
, i
, base_binfo
); i
++)
14262 TYPE_MARKED_P (BINFO_TYPE (base_binfo
)) = 0;
14263 TYPE_MARKED_P (ref
) = 0;
14265 /* Now see if we have a repeated base type. */
14266 if (!CLASSTYPE_REPEATED_BASE_P (ref
))
14268 for (base_binfo
= binfo
; base_binfo
;
14269 base_binfo
= TREE_CHAIN (base_binfo
))
14271 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo
)))
14273 CLASSTYPE_REPEATED_BASE_P (ref
) = 1;
14276 TYPE_MARKED_P (BINFO_TYPE (base_binfo
)) = 1;
14278 for (base_binfo
= binfo
; base_binfo
;
14279 base_binfo
= TREE_CHAIN (base_binfo
))
14280 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo
)))
14281 TYPE_MARKED_P (BINFO_TYPE (base_binfo
)) = 0;
14288 /* Copies the enum-related properties from type SRC to type DST.
14289 Used with the underlying type of an enum and the enum itself. */
14291 copy_type_enum (tree dst
, tree src
)
14294 for (t
= dst
; t
; t
= TYPE_NEXT_VARIANT (t
))
14296 TYPE_MIN_VALUE (t
) = TYPE_MIN_VALUE (src
);
14297 TYPE_MAX_VALUE (t
) = TYPE_MAX_VALUE (src
);
14298 TYPE_SIZE (t
) = TYPE_SIZE (src
);
14299 TYPE_SIZE_UNIT (t
) = TYPE_SIZE_UNIT (src
);
14300 SET_TYPE_MODE (dst
, TYPE_MODE (src
));
14301 TYPE_PRECISION (t
) = TYPE_PRECISION (src
);
14302 unsigned valign
= TYPE_ALIGN (src
);
14303 if (TYPE_USER_ALIGN (t
))
14304 valign
= MAX (valign
, TYPE_ALIGN (t
));
14306 TYPE_USER_ALIGN (t
) = TYPE_USER_ALIGN (src
);
14307 SET_TYPE_ALIGN (t
, valign
);
14308 TYPE_UNSIGNED (t
) = TYPE_UNSIGNED (src
);
14312 /* Begin compiling the definition of an enumeration type.
14315 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
14317 UNDERLYING_TYPE is the type that will be used as the storage for
14318 the enumeration type. This should be NULL_TREE if no storage type
14321 ATTRIBUTES are any attributes specified after the enum-key.
14323 SCOPED_ENUM_P is true if this is a scoped enumeration type.
14325 if IS_NEW is not NULL, gets TRUE iff a new type is created.
14327 Returns the type object, as yet incomplete.
14328 Also records info about it so that build_enumerator
14329 may be used to declare the individual values as they are read. */
14332 start_enum (tree name
, tree enumtype
, tree underlying_type
,
14333 tree attributes
, bool scoped_enum_p
, bool *is_new
)
14335 tree prevtype
= NULL_TREE
;
14336 gcc_assert (identifier_p (name
));
14340 /* [C++0x dcl.enum]p5:
14342 If not explicitly specified, the underlying type of a scoped
14343 enumeration type is int. */
14344 if (!underlying_type
&& scoped_enum_p
)
14345 underlying_type
= integer_type_node
;
14347 if (underlying_type
)
14348 underlying_type
= cv_unqualified (underlying_type
);
14350 /* If this is the real definition for a previous forward reference,
14351 fill in the contents in the same object that used to be the
14352 forward reference. */
14354 enumtype
= lookup_and_check_tag (enum_type
, name
,
14355 /*tag_scope=*/ts_current
,
14356 /*template_header_p=*/false);
14358 /* In case of a template_decl, the only check that should be deferred
14359 to instantiation time is the comparison of underlying types. */
14360 if (enumtype
&& TREE_CODE (enumtype
) == ENUMERAL_TYPE
)
14362 if (scoped_enum_p
!= SCOPED_ENUM_P (enumtype
))
14364 error_at (input_location
, "scoped/unscoped mismatch "
14365 "in enum %q#T", enumtype
);
14366 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype
)),
14367 "previous definition here");
14368 enumtype
= error_mark_node
;
14370 else if (ENUM_FIXED_UNDERLYING_TYPE_P (enumtype
) != !! underlying_type
)
14372 error_at (input_location
, "underlying type mismatch "
14373 "in enum %q#T", enumtype
);
14374 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype
)),
14375 "previous definition here");
14376 enumtype
= error_mark_node
;
14378 else if (underlying_type
&& ENUM_UNDERLYING_TYPE (enumtype
)
14379 && !same_type_p (underlying_type
,
14380 ENUM_UNDERLYING_TYPE (enumtype
)))
14382 error_at (input_location
, "different underlying type "
14383 "in enum %q#T", enumtype
);
14384 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype
)),
14385 "previous definition here");
14386 underlying_type
= NULL_TREE
;
14390 if (!enumtype
|| TREE_CODE (enumtype
) != ENUMERAL_TYPE
14391 || processing_template_decl
)
14393 /* In case of error, make a dummy enum to allow parsing to
14395 if (enumtype
== error_mark_node
)
14397 name
= make_anon_name ();
14398 enumtype
= NULL_TREE
;
14401 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
14402 of an opaque enum, or an opaque enum of an already defined
14403 enumeration (C++11).
14404 In any other case, it'll be NULL_TREE. */
14410 prevtype
= enumtype
;
14412 /* Do not push the decl more than once. */
14414 || TREE_CODE (enumtype
) != ENUMERAL_TYPE
)
14416 enumtype
= cxx_make_type (ENUMERAL_TYPE
);
14417 enumtype
= pushtag (name
, enumtype
, /*tag_scope=*/ts_current
);
14419 /* std::byte aliases anything. */
14420 if (enumtype
!= error_mark_node
14421 && TYPE_CONTEXT (enumtype
) == std_node
14422 && !strcmp ("byte", TYPE_NAME_STRING (enumtype
)))
14423 TYPE_ALIAS_SET (enumtype
) = 0;
14426 enumtype
= xref_tag (enum_type
, name
, /*tag_scope=*/ts_current
,
14429 if (enumtype
== error_mark_node
)
14430 return error_mark_node
;
14432 /* The enum is considered opaque until the opening '{' of the
14433 enumerator list. */
14434 SET_OPAQUE_ENUM_P (enumtype
, true);
14435 ENUM_FIXED_UNDERLYING_TYPE_P (enumtype
) = !! underlying_type
;
14438 SET_SCOPED_ENUM_P (enumtype
, scoped_enum_p
);
14440 cplus_decl_attributes (&enumtype
, attributes
, (int)ATTR_FLAG_TYPE_IN_PLACE
);
14442 if (underlying_type
)
14444 if (ENUM_UNDERLYING_TYPE (enumtype
))
14445 /* We already checked that it matches, don't change it to a different
14446 typedef variant. */;
14447 else if (CP_INTEGRAL_TYPE_P (underlying_type
))
14449 copy_type_enum (enumtype
, underlying_type
);
14450 ENUM_UNDERLYING_TYPE (enumtype
) = underlying_type
;
14452 else if (dependent_type_p (underlying_type
))
14453 ENUM_UNDERLYING_TYPE (enumtype
) = underlying_type
;
14455 error ("underlying type %qT of %qT must be an integral type",
14456 underlying_type
, enumtype
);
14459 /* If into a template class, the returned enum is always the first
14460 declaration (opaque or not) seen. This way all the references to
14461 this type will be to the same declaration. The following ones are used
14462 only to check for definition errors. */
14463 if (prevtype
&& processing_template_decl
)
14469 /* After processing and defining all the values of an enumeration type,
14470 install their decls in the enumeration type.
14471 ENUMTYPE is the type object. */
14474 finish_enum_value_list (tree enumtype
)
14477 tree underlying_type
;
14480 tree minnode
, maxnode
;
14483 bool fixed_underlying_type_p
14484 = ENUM_UNDERLYING_TYPE (enumtype
) != NULL_TREE
;
14486 /* We built up the VALUES in reverse order. */
14487 TYPE_VALUES (enumtype
) = nreverse (TYPE_VALUES (enumtype
));
14489 /* For an enum defined in a template, just set the type of the values;
14490 all further processing is postponed until the template is
14491 instantiated. We need to set the type so that tsubst of a CONST_DECL
14493 if (processing_template_decl
)
14495 for (values
= TYPE_VALUES (enumtype
);
14497 values
= TREE_CHAIN (values
))
14498 TREE_TYPE (TREE_VALUE (values
)) = enumtype
;
14502 /* Determine the minimum and maximum values of the enumerators. */
14503 if (TYPE_VALUES (enumtype
))
14505 minnode
= maxnode
= NULL_TREE
;
14507 for (values
= TYPE_VALUES (enumtype
);
14509 values
= TREE_CHAIN (values
))
14511 decl
= TREE_VALUE (values
);
14513 /* [dcl.enum]: Following the closing brace of an enum-specifier,
14514 each enumerator has the type of its enumeration. Prior to the
14515 closing brace, the type of each enumerator is the type of its
14516 initializing value. */
14517 TREE_TYPE (decl
) = enumtype
;
14519 /* Update the minimum and maximum values, if appropriate. */
14520 value
= DECL_INITIAL (decl
);
14521 if (value
== error_mark_node
)
14522 value
= integer_zero_node
;
14523 /* Figure out what the minimum and maximum values of the
14524 enumerators are. */
14526 minnode
= maxnode
= value
;
14527 else if (tree_int_cst_lt (maxnode
, value
))
14529 else if (tree_int_cst_lt (value
, minnode
))
14536 If the enumerator-list is empty, the underlying type is as if
14537 the enumeration had a single enumerator with value 0. */
14538 minnode
= maxnode
= integer_zero_node
;
14540 if (!fixed_underlying_type_p
)
14542 /* Compute the number of bits require to represent all values of the
14543 enumeration. We must do this before the type of MINNODE and
14544 MAXNODE are transformed, since tree_int_cst_min_precision relies
14545 on the TREE_TYPE of the value it is passed. */
14546 signop sgn
= tree_int_cst_sgn (minnode
) >= 0 ? UNSIGNED
: SIGNED
;
14547 int lowprec
= tree_int_cst_min_precision (minnode
, sgn
);
14548 int highprec
= tree_int_cst_min_precision (maxnode
, sgn
);
14549 int precision
= MAX (lowprec
, highprec
);
14551 bool use_short_enum
;
14553 /* Determine the underlying type of the enumeration.
14557 The underlying type of an enumeration is an integral type that
14558 can represent all the enumerator values defined in the
14559 enumeration. It is implementation-defined which integral type is
14560 used as the underlying type for an enumeration except that the
14561 underlying type shall not be larger than int unless the value of
14562 an enumerator cannot fit in an int or unsigned int.
14564 We use "int" or an "unsigned int" as the underlying type, even if
14565 a smaller integral type would work, unless the user has
14566 explicitly requested that we use the smallest possible type. The
14567 user can request that for all enumerations with a command line
14568 flag, or for just one enumeration with an attribute. */
14570 use_short_enum
= flag_short_enums
14571 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype
));
14573 /* If the precision of the type was specified with an attribute and it
14574 was too small, give an error. Otherwise, use it. */
14575 if (TYPE_PRECISION (enumtype
))
14577 if (precision
> TYPE_PRECISION (enumtype
))
14578 error ("specified mode too small for enumeral values");
14581 use_short_enum
= true;
14582 precision
= TYPE_PRECISION (enumtype
);
14586 for (itk
= (use_short_enum
? itk_char
: itk_int
);
14590 underlying_type
= integer_types
[itk
];
14591 if (underlying_type
!= NULL_TREE
14592 && TYPE_PRECISION (underlying_type
) >= precision
14593 && TYPE_SIGN (underlying_type
) == sgn
)
14596 if (itk
== itk_none
)
14600 IF no integral type can represent all the enumerator values, the
14601 enumeration is ill-formed. */
14602 error ("no integral type can represent all of the enumerator values "
14603 "for %qT", enumtype
);
14604 precision
= TYPE_PRECISION (long_long_integer_type_node
);
14605 underlying_type
= integer_types
[itk_unsigned_long_long
];
14610 The value of sizeof() applied to an enumeration type, an object
14611 of an enumeration type, or an enumerator, is the value of sizeof()
14612 applied to the underlying type. */
14613 copy_type_enum (enumtype
, underlying_type
);
14615 /* Compute the minimum and maximum values for the type.
14619 For an enumeration where emin is the smallest enumerator and emax
14620 is the largest, the values of the enumeration are the values of the
14621 underlying type in the range bmin to bmax, where bmin and bmax are,
14622 respectively, the smallest and largest values of the smallest bit-
14623 field that can store emin and emax. */
14625 /* The middle-end currently assumes that types with TYPE_PRECISION
14626 narrower than their underlying type are suitably zero or sign
14627 extended to fill their mode. Similarly, it assumes that the front
14628 end assures that a value of a particular type must be within
14629 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
14631 We used to set these fields based on bmin and bmax, but that led
14632 to invalid assumptions like optimizing away bounds checking. So
14633 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
14634 TYPE_MAX_VALUE to the values for the mode above and only restrict
14635 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
14636 ENUM_UNDERLYING_TYPE (enumtype
)
14637 = build_distinct_type_copy (underlying_type
);
14638 TYPE_PRECISION (ENUM_UNDERLYING_TYPE (enumtype
)) = precision
;
14639 set_min_and_max_values_for_integral_type
14640 (ENUM_UNDERLYING_TYPE (enumtype
), precision
, sgn
);
14642 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
14643 if (flag_strict_enums
)
14644 set_min_and_max_values_for_integral_type (enumtype
, precision
, sgn
);
14647 underlying_type
= ENUM_UNDERLYING_TYPE (enumtype
);
14649 /* Convert each of the enumerators to the type of the underlying
14650 type of the enumeration. */
14651 for (values
= TYPE_VALUES (enumtype
); values
; values
= TREE_CHAIN (values
))
14653 location_t saved_location
;
14655 decl
= TREE_VALUE (values
);
14656 saved_location
= input_location
;
14657 input_location
= DECL_SOURCE_LOCATION (decl
);
14658 if (fixed_underlying_type_p
)
14659 /* If the enumeration type has a fixed underlying type, we
14660 already checked all of the enumerator values. */
14661 value
= DECL_INITIAL (decl
);
14663 value
= perform_implicit_conversion (underlying_type
,
14664 DECL_INITIAL (decl
),
14665 tf_warning_or_error
);
14666 input_location
= saved_location
;
14668 /* Do not clobber shared ints. */
14669 if (value
!= error_mark_node
)
14671 value
= copy_node (value
);
14673 TREE_TYPE (value
) = enumtype
;
14675 DECL_INITIAL (decl
) = value
;
14678 /* Fix up all variant types of this enum type. */
14679 for (t
= TYPE_MAIN_VARIANT (enumtype
); t
; t
= TYPE_NEXT_VARIANT (t
))
14680 TYPE_VALUES (t
) = TYPE_VALUES (enumtype
);
14682 if (at_class_scope_p ()
14683 && COMPLETE_TYPE_P (current_class_type
)
14684 && UNSCOPED_ENUM_P (enumtype
))
14686 insert_late_enum_def_bindings (current_class_type
, enumtype
);
14687 /* TYPE_FIELDS needs fixup. */
14688 fixup_type_variants (current_class_type
);
14691 /* Finish debugging output for this type. */
14692 rest_of_type_compilation (enumtype
, namespace_bindings_p ());
14694 /* Each enumerator now has the type of its enumeration. Clear the cache
14695 so that this change in types doesn't confuse us later on. */
14696 clear_cv_and_fold_caches ();
14699 /* Finishes the enum type. This is called only the first time an
14700 enumeration is seen, be it opaque or odinary.
14701 ENUMTYPE is the type object. */
14704 finish_enum (tree enumtype
)
14706 if (processing_template_decl
)
14708 if (at_function_scope_p ())
14709 add_stmt (build_min (TAG_DEFN
, enumtype
));
14713 /* If this is a forward declaration, there should not be any variants,
14714 though we can get a variant in the middle of an enum-specifier with
14715 wacky code like 'enum E { e = sizeof(const E*) };' */
14716 gcc_assert (enumtype
== TYPE_MAIN_VARIANT (enumtype
)
14717 && (TYPE_VALUES (enumtype
)
14718 || !TYPE_NEXT_VARIANT (enumtype
)));
14721 /* Build and install a CONST_DECL for an enumeration constant of the
14722 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
14723 Apply ATTRIBUTES if available. LOC is the location of NAME.
14724 Assignment of sequential values by default is handled here. */
14727 build_enumerator (tree name
, tree value
, tree enumtype
, tree attributes
,
14734 /* scalar_constant_value will pull out this expression, so make sure
14735 it's folded as appropriate. */
14736 if (processing_template_decl
)
14737 value
= fold_non_dependent_expr (value
);
14739 /* If the VALUE was erroneous, pretend it wasn't there; that will
14740 result in the enum being assigned the next value in sequence. */
14741 if (value
== error_mark_node
)
14744 /* Remove no-op casts from the value. */
14746 STRIP_TYPE_NOPS (value
);
14748 if (! processing_template_decl
)
14750 /* Validate and default VALUE. */
14751 if (value
!= NULL_TREE
)
14753 if (!ENUM_UNDERLYING_TYPE (enumtype
))
14755 tree tmp_value
= build_expr_type_conversion (WANT_INT
| WANT_ENUM
,
14760 else if (! INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P
14761 (TREE_TYPE (value
)))
14762 value
= perform_implicit_conversion_flags
14763 (ENUM_UNDERLYING_TYPE (enumtype
), value
, tf_warning_or_error
,
14764 LOOKUP_IMPLICIT
| LOOKUP_NO_NARROWING
);
14766 if (value
== error_mark_node
)
14769 if (value
!= NULL_TREE
)
14771 if (! INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P
14772 (TREE_TYPE (value
)))
14774 error ("enumerator value for %qD must have integral or "
14775 "unscoped enumeration type", name
);
14780 value
= cxx_constant_value (value
);
14782 if (TREE_CODE (value
) != INTEGER_CST
)
14784 error ("enumerator value for %qD is not an integer "
14792 /* Default based on previous value. */
14793 if (value
== NULL_TREE
)
14795 if (TYPE_VALUES (enumtype
))
14799 /* C++03 7.2/4: If no initializer is specified for the first
14800 enumerator, the type is an unspecified integral
14801 type. Otherwise the type is the same as the type of the
14802 initializing value of the preceding enumerator unless the
14803 incremented value is not representable in that type, in
14804 which case the type is an unspecified integral type
14805 sufficient to contain the incremented value. */
14806 prev_value
= DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype
)));
14807 if (error_operand_p (prev_value
))
14808 value
= error_mark_node
;
14811 wi::overflow_type overflowed
;
14812 tree type
= TREE_TYPE (prev_value
);
14813 signop sgn
= TYPE_SIGN (type
);
14814 widest_int wi
= wi::add (wi::to_widest (prev_value
), 1, sgn
,
14818 bool pos
= !wi::neg_p (wi
, sgn
);
14819 if (!wi::fits_to_tree_p (wi
, type
))
14822 for (itk
= itk_int
; itk
!= itk_none
; itk
++)
14824 type
= integer_types
[itk
];
14825 if (type
!= NULL_TREE
14826 && (pos
|| !TYPE_UNSIGNED (type
))
14827 && wi::fits_to_tree_p (wi
, type
))
14830 if (type
&& cxx_dialect
< cxx11
14831 && itk
> itk_unsigned_long
)
14832 pedwarn (input_location
, OPT_Wlong_long
,
14834 incremented enumerator value is too large for %<unsigned long%>") : G_("\
14835 incremented enumerator value is too large for %<long%>"));
14837 if (type
== NULL_TREE
)
14838 overflowed
= wi::OVF_UNKNOWN
;
14840 value
= wide_int_to_tree (type
, wi
);
14845 error ("overflow in enumeration values at %qD", name
);
14846 value
= error_mark_node
;
14851 value
= integer_zero_node
;
14854 /* Remove no-op casts from the value. */
14855 STRIP_TYPE_NOPS (value
);
14857 /* If the underlying type of the enum is fixed, check whether
14858 the enumerator values fits in the underlying type. If it
14859 does not fit, the program is ill-formed [C++0x dcl.enum]. */
14860 if (ENUM_UNDERLYING_TYPE (enumtype
)
14862 && TREE_CODE (value
) == INTEGER_CST
)
14864 if (!int_fits_type_p (value
, ENUM_UNDERLYING_TYPE (enumtype
)))
14865 error ("enumerator value %qE is outside the range of underlying "
14866 "type %qT", value
, ENUM_UNDERLYING_TYPE (enumtype
));
14868 /* Convert the value to the appropriate type. */
14869 value
= fold_convert (ENUM_UNDERLYING_TYPE (enumtype
), value
);
14873 /* C++ associates enums with global, function, or class declarations. */
14874 context
= current_scope ();
14876 /* Build the actual enumeration constant. Note that the enumeration
14877 constants have the underlying type of the enum (if it is fixed)
14878 or the type of their initializer (if the underlying type of the
14879 enum is not fixed):
14883 If the underlying type is fixed, the type of each enumerator
14884 prior to the closing brace is the underlying type; if the
14885 initializing value of an enumerator cannot be represented by
14886 the underlying type, the program is ill-formed. If the
14887 underlying type is not fixed, the type of each enumerator is
14888 the type of its initializing value.
14890 If the underlying type is not fixed, it will be computed by
14891 finish_enum and we will reset the type of this enumerator. Of
14892 course, if we're processing a template, there may be no value. */
14893 type
= value
? TREE_TYPE (value
) : NULL_TREE
;
14895 decl
= build_decl (loc
, CONST_DECL
, name
, type
);
14897 DECL_CONTEXT (decl
) = enumtype
;
14898 TREE_CONSTANT (decl
) = 1;
14899 TREE_READONLY (decl
) = 1;
14900 DECL_INITIAL (decl
) = value
;
14903 cplus_decl_attributes (&decl
, attributes
, 0);
14905 if (context
&& context
== current_class_type
&& !SCOPED_ENUM_P (enumtype
))
14907 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
14908 on the TYPE_FIELDS list for `S'. (That's so that you can say
14909 things like `S::i' later.) */
14911 /* The enumerator may be getting declared outside of its enclosing
14914 class S { public: enum E : int; }; enum S::E : int { i = 7; };
14916 For which case we need to make sure that the access of `S::i'
14917 matches the access of `S::E'. */
14918 tree saved_cas
= current_access_specifier
;
14919 if (TREE_PRIVATE (TYPE_NAME (enumtype
)))
14920 current_access_specifier
= access_private_node
;
14921 else if (TREE_PROTECTED (TYPE_NAME (enumtype
)))
14922 current_access_specifier
= access_protected_node
;
14924 current_access_specifier
= access_public_node
;
14926 finish_member_declaration (decl
);
14928 current_access_specifier
= saved_cas
;
14933 /* Add this enumeration constant to the list for this type. */
14934 TYPE_VALUES (enumtype
) = tree_cons (name
, decl
, TYPE_VALUES (enumtype
));
14937 /* Look for an enumerator with the given NAME within the enumeration
14938 type ENUMTYPE. This routine is used primarily for qualified name
14939 lookup into an enumerator in C++0x, e.g.,
14941 enum class Color { Red, Green, Blue };
14943 Color color = Color::Red;
14945 Returns the value corresponding to the enumerator, or
14946 NULL_TREE if no such enumerator was found. */
14948 lookup_enumerator (tree enumtype
, tree name
)
14951 gcc_assert (enumtype
&& TREE_CODE (enumtype
) == ENUMERAL_TYPE
);
14953 e
= purpose_member (name
, TYPE_VALUES (enumtype
));
14954 return e
? TREE_VALUE (e
) : NULL_TREE
;
14958 /* We're defining DECL. Make sure that its type is OK. */
14961 check_function_type (tree decl
, tree current_function_parms
)
14963 tree fntype
= TREE_TYPE (decl
);
14964 tree return_type
= complete_type (TREE_TYPE (fntype
));
14966 /* In a function definition, arg types must be complete. */
14967 require_complete_types_for_parms (current_function_parms
);
14969 if (dependent_type_p (return_type
)
14970 || type_uses_auto (return_type
))
14972 if (!COMPLETE_OR_VOID_TYPE_P (return_type
))
14974 tree args
= TYPE_ARG_TYPES (fntype
);
14976 error ("return type %q#T is incomplete", return_type
);
14978 /* Make it return void instead. */
14979 if (TREE_CODE (fntype
) == METHOD_TYPE
)
14980 fntype
= build_method_type_directly (TREE_TYPE (TREE_VALUE (args
)),
14982 TREE_CHAIN (args
));
14984 fntype
= build_function_type (void_type_node
, args
);
14985 fntype
= (cp_build_type_attribute_variant
14986 (fntype
, TYPE_ATTRIBUTES (TREE_TYPE (decl
))));
14987 fntype
= cxx_copy_lang_qualifiers (fntype
, TREE_TYPE (decl
));
14988 TREE_TYPE (decl
) = fntype
;
14992 abstract_virtuals_error (decl
, TREE_TYPE (fntype
));
14993 maybe_warn_parm_abi (TREE_TYPE (fntype
),
14994 DECL_SOURCE_LOCATION (decl
));
14998 /* True iff FN is an implicitly-defined default constructor. */
15001 implicit_default_ctor_p (tree fn
)
15003 return (DECL_CONSTRUCTOR_P (fn
)
15004 && !user_provided_p (fn
)
15005 && sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (fn
)));
15008 /* Clobber the contents of *this to let the back end know that the object
15009 storage is dead when we enter the constructor or leave the destructor. */
15012 build_clobber_this ()
15014 /* Clobbering an empty base is pointless, and harmful if its one byte
15015 TYPE_SIZE overlays real data. */
15016 if (is_empty_class (current_class_type
))
15019 /* If we have virtual bases, clobber the whole object, but only if we're in
15020 charge. If we don't have virtual bases, clobber the as-base type so we
15021 don't mess with tail padding. */
15022 bool vbases
= CLASSTYPE_VBASECLASSES (current_class_type
);
15024 tree ctype
= current_class_type
;
15026 ctype
= CLASSTYPE_AS_BASE (ctype
);
15028 tree clobber
= build_clobber (ctype
);
15030 tree thisref
= current_class_ref
;
15031 if (ctype
!= current_class_type
)
15033 thisref
= build_nop (build_reference_type (ctype
), current_class_ptr
);
15034 thisref
= convert_from_reference (thisref
);
15037 tree exprstmt
= build2 (MODIFY_EXPR
, void_type_node
, thisref
, clobber
);
15039 exprstmt
= build_if_in_charge (exprstmt
);
15044 /* Create the FUNCTION_DECL for a function definition.
15045 DECLSPECS and DECLARATOR are the parts of the declaration;
15046 they describe the function's name and the type it returns,
15047 but twisted together in a fashion that parallels the syntax of C.
15049 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
15050 DECLARATOR is really the DECL for the function we are about to
15051 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
15052 indicating that the function is an inline defined in-class.
15054 This function creates a binding context for the function body
15055 as well as setting up the FUNCTION_DECL in current_function_decl.
15057 For C++, we must first check whether that datum makes any sense.
15058 For example, "class A local_a(1,2);" means that variable local_a
15059 is an aggregate of type A, which should have a constructor
15060 applied to it with the argument list [1, 2].
15062 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
15063 or may be a BLOCK if the function has been defined previously
15064 in this translation unit. On exit, DECL_INITIAL (decl1) will be
15065 error_mark_node if the function has never been defined, or
15066 a BLOCK if the function has been defined somewhere. */
15069 start_preparsed_function (tree decl1
, tree attrs
, int flags
)
15071 tree ctype
= NULL_TREE
;
15074 int doing_friend
= 0;
15075 cp_binding_level
*bl
;
15076 tree current_function_parms
;
15077 struct c_fileinfo
*finfo
15078 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1
)));
15079 bool honor_interface
;
15081 /* Sanity check. */
15082 gcc_assert (VOID_TYPE_P (TREE_VALUE (void_list_node
)));
15083 gcc_assert (TREE_CHAIN (void_list_node
) == NULL_TREE
);
15085 fntype
= TREE_TYPE (decl1
);
15086 if (TREE_CODE (fntype
) == METHOD_TYPE
)
15087 ctype
= TYPE_METHOD_BASETYPE (fntype
);
15089 /* ISO C++ 11.4/5. A friend function defined in a class is in
15090 the (lexical) scope of the class in which it is defined. */
15091 if (!ctype
&& DECL_FRIEND_P (decl1
))
15093 ctype
= DECL_FRIEND_CONTEXT (decl1
);
15095 /* CTYPE could be null here if we're dealing with a template;
15096 for example, `inline friend float foo()' inside a template
15097 will have no CTYPE set. */
15098 if (ctype
&& TREE_CODE (ctype
) != RECORD_TYPE
)
15104 if (DECL_DECLARED_INLINE_P (decl1
)
15105 && lookup_attribute ("noinline", attrs
))
15106 warning_at (DECL_SOURCE_LOCATION (decl1
), 0,
15107 "inline function %qD given attribute noinline", decl1
);
15109 /* Handle gnu_inline attribute. */
15110 if (GNU_INLINE_P (decl1
))
15112 DECL_EXTERNAL (decl1
) = 1;
15113 DECL_NOT_REALLY_EXTERN (decl1
) = 0;
15114 DECL_INTERFACE_KNOWN (decl1
) = 1;
15115 DECL_DISREGARD_INLINE_LIMITS (decl1
) = 1;
15118 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1
))
15119 /* This is a constructor, we must ensure that any default args
15120 introduced by this definition are propagated to the clones
15121 now. The clones are used directly in overload resolution. */
15122 adjust_clone_args (decl1
);
15124 /* Sometimes we don't notice that a function is a static member, and
15125 build a METHOD_TYPE for it. Fix that up now. */
15126 gcc_assert (!(ctype
!= NULL_TREE
&& DECL_STATIC_FUNCTION_P (decl1
)
15127 && TREE_CODE (TREE_TYPE (decl1
)) == METHOD_TYPE
));
15129 /* Set up current_class_type, and enter the scope of the class, if
15132 push_nested_class (ctype
);
15133 else if (DECL_STATIC_FUNCTION_P (decl1
))
15134 push_nested_class (DECL_CONTEXT (decl1
));
15136 /* Now that we have entered the scope of the class, we must restore
15137 the bindings for any template parameters surrounding DECL1, if it
15138 is an inline member template. (Order is important; consider the
15139 case where a template parameter has the same name as a field of
15140 the class.) It is not until after this point that
15141 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
15142 if (flags
& SF_INCLASS_INLINE
)
15143 maybe_begin_member_template_processing (decl1
);
15145 /* Effective C++ rule 15. */
15147 && DECL_ASSIGNMENT_OPERATOR_P (decl1
)
15148 && DECL_OVERLOADED_OPERATOR_IS (decl1
, NOP_EXPR
)
15149 && VOID_TYPE_P (TREE_TYPE (fntype
)))
15150 warning (OPT_Weffc__
,
15151 "%<operator=%> should return a reference to %<*this%>");
15153 /* Make the init_value nonzero so pushdecl knows this is not tentative.
15154 error_mark_node is replaced below (in poplevel) with the BLOCK. */
15155 if (!DECL_INITIAL (decl1
))
15156 DECL_INITIAL (decl1
) = error_mark_node
;
15158 /* This function exists in static storage.
15159 (This does not mean `static' in the C sense!) */
15160 TREE_STATIC (decl1
) = 1;
15162 /* We must call push_template_decl after current_class_type is set
15163 up. (If we are processing inline definitions after exiting a
15164 class scope, current_class_type will be NULL_TREE until set above
15165 by push_nested_class.) */
15166 if (processing_template_decl
)
15168 tree newdecl1
= push_template_decl (decl1
);
15169 if (newdecl1
== error_mark_node
)
15171 if (ctype
|| DECL_STATIC_FUNCTION_P (decl1
))
15172 pop_nested_class ();
15178 /* Make sure the parameter and return types are reasonable. When
15179 you declare a function, these types can be incomplete, but they
15180 must be complete when you define the function. */
15181 check_function_type (decl1
, DECL_ARGUMENTS (decl1
));
15183 /* Build the return declaration for the function. */
15184 restype
= TREE_TYPE (fntype
);
15186 if (DECL_RESULT (decl1
) == NULL_TREE
)
15190 resdecl
= build_decl (input_location
, RESULT_DECL
, 0, restype
);
15191 DECL_ARTIFICIAL (resdecl
) = 1;
15192 DECL_IGNORED_P (resdecl
) = 1;
15193 DECL_RESULT (decl1
) = resdecl
;
15195 cp_apply_type_quals_to_decl (cp_type_quals (restype
), resdecl
);
15198 /* Record the decl so that the function name is defined.
15199 If we already have a decl for this name, and it is a FUNCTION_DECL,
15200 use the old decl. */
15201 if (!processing_template_decl
&& !(flags
& SF_PRE_PARSED
))
15203 /* A specialization is not used to guide overload resolution. */
15204 if (!DECL_FUNCTION_MEMBER_P (decl1
)
15205 && !(DECL_USE_TEMPLATE (decl1
) &&
15206 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1
))))
15208 tree olddecl
= pushdecl (decl1
);
15210 if (olddecl
== error_mark_node
)
15211 /* If something went wrong when registering the declaration,
15212 use DECL1; we have to have a FUNCTION_DECL to use when
15213 parsing the body of the function. */
15217 /* Otherwise, OLDDECL is either a previous declaration
15218 of the same function or DECL1 itself. */
15220 if (warn_missing_declarations
15221 && olddecl
== decl1
15222 && !DECL_MAIN_P (decl1
)
15223 && TREE_PUBLIC (decl1
)
15224 && !DECL_DECLARED_INLINE_P (decl1
))
15228 /* Check whether DECL1 is in an anonymous
15230 for (context
= DECL_CONTEXT (decl1
);
15232 context
= DECL_CONTEXT (context
))
15234 if (TREE_CODE (context
) == NAMESPACE_DECL
15235 && DECL_NAME (context
) == NULL_TREE
)
15239 if (context
== NULL
)
15240 warning_at (DECL_SOURCE_LOCATION (decl1
),
15241 OPT_Wmissing_declarations
,
15242 "no previous declaration for %qD", decl1
);
15250 /* We need to set the DECL_CONTEXT. */
15251 if (!DECL_CONTEXT (decl1
) && DECL_TEMPLATE_INFO (decl1
))
15252 DECL_CONTEXT (decl1
) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1
));
15254 fntype
= TREE_TYPE (decl1
);
15255 restype
= TREE_TYPE (fntype
);
15257 /* If #pragma weak applies, mark the decl appropriately now.
15258 The pragma only applies to global functions. Because
15259 determining whether or not the #pragma applies involves
15260 computing the mangled name for the declaration, we cannot
15261 apply the pragma until after we have merged this declaration
15262 with any previous declarations; if the original declaration
15263 has a linkage specification, that specification applies to
15264 the definition as well, and may affect the mangled name. */
15265 if (DECL_FILE_SCOPE_P (decl1
))
15266 maybe_apply_pragma_weak (decl1
);
15269 /* We are now in the scope of the function being defined. */
15270 current_function_decl
= decl1
;
15272 /* Save the parm names or decls from this function's declarator
15273 where store_parm_decls will find them. */
15274 current_function_parms
= DECL_ARGUMENTS (decl1
);
15276 /* Let the user know we're compiling this function. */
15277 announce_function (decl1
);
15279 gcc_assert (DECL_INITIAL (decl1
));
15281 /* This function may already have been parsed, in which case just
15282 return; our caller will skip over the body without parsing. */
15283 if (DECL_INITIAL (decl1
) != error_mark_node
)
15286 /* Initialize RTL machinery. We cannot do this until
15287 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
15288 even when processing a template; this is how we get
15289 CFUN set up, and our per-function variables initialized.
15290 FIXME factor out the non-RTL stuff. */
15291 bl
= current_binding_level
;
15292 allocate_struct_function (decl1
, processing_template_decl
);
15294 /* Initialize the language data structures. Whenever we start
15295 a new function, we destroy temporaries in the usual way. */
15296 cfun
->language
= ggc_cleared_alloc
<language_function
> ();
15297 current_stmt_tree ()->stmts_are_full_exprs_p
= 1;
15298 current_binding_level
= bl
;
15300 if (!processing_template_decl
&& type_uses_auto (restype
))
15302 FNDECL_USED_AUTO (decl1
) = true;
15303 current_function_auto_return_pattern
= restype
;
15306 /* Start the statement-tree, start the tree now. */
15307 DECL_SAVED_TREE (decl1
) = push_stmt_list ();
15309 /* If we are (erroneously) defining a function that we have already
15310 defined before, wipe out what we knew before. */
15311 if (!DECL_PENDING_INLINE_P (decl1
))
15312 DECL_SAVED_FUNCTION_DATA (decl1
) = NULL
;
15314 if (ctype
&& !doing_friend
&& !DECL_STATIC_FUNCTION_P (decl1
))
15316 /* We know that this was set up by `grokclassfn'. We do not
15317 wait until `store_parm_decls', since evil parse errors may
15318 never get us to that point. Here we keep the consistency
15319 between `current_class_type' and `current_class_ptr'. */
15320 tree t
= DECL_ARGUMENTS (decl1
);
15322 gcc_assert (t
!= NULL_TREE
&& TREE_CODE (t
) == PARM_DECL
);
15323 gcc_assert (TYPE_PTR_P (TREE_TYPE (t
)));
15325 cp_function_chain
->x_current_class_ref
15326 = cp_build_fold_indirect_ref (t
);
15327 /* Set this second to avoid shortcut in cp_build_indirect_ref. */
15328 cp_function_chain
->x_current_class_ptr
= t
;
15330 /* Constructors and destructors need to know whether they're "in
15331 charge" of initializing virtual base classes. */
15332 t
= DECL_CHAIN (t
);
15333 if (DECL_HAS_IN_CHARGE_PARM_P (decl1
))
15335 current_in_charge_parm
= t
;
15336 t
= DECL_CHAIN (t
);
15338 if (DECL_HAS_VTT_PARM_P (decl1
))
15340 gcc_assert (DECL_NAME (t
) == vtt_parm_identifier
);
15341 current_vtt_parm
= t
;
15345 honor_interface
= (!DECL_TEMPLATE_INSTANTIATION (decl1
)
15346 /* Implicitly-defined methods (like the
15347 destructor for a class in which no destructor
15348 is explicitly declared) must not be defined
15349 until their definition is needed. So, we
15350 ignore interface specifications for
15351 compiler-generated functions. */
15352 && !DECL_ARTIFICIAL (decl1
));
15354 if (processing_template_decl
)
15355 /* Don't mess with interface flags. */;
15356 else if (DECL_INTERFACE_KNOWN (decl1
))
15358 tree ctx
= decl_function_context (decl1
);
15360 if (DECL_NOT_REALLY_EXTERN (decl1
))
15361 DECL_EXTERNAL (decl1
) = 0;
15363 if (ctx
!= NULL_TREE
&& vague_linkage_p (ctx
))
15364 /* This is a function in a local class in an extern inline
15365 or template function. */
15366 comdat_linkage (decl1
);
15368 /* If this function belongs to an interface, it is public.
15369 If it belongs to someone else's interface, it is also external.
15370 This only affects inlines and template instantiations. */
15371 else if (!finfo
->interface_unknown
&& honor_interface
)
15373 if (DECL_DECLARED_INLINE_P (decl1
)
15374 || DECL_TEMPLATE_INSTANTIATION (decl1
))
15376 DECL_EXTERNAL (decl1
)
15377 = (finfo
->interface_only
15378 || (DECL_DECLARED_INLINE_P (decl1
)
15379 && ! flag_implement_inlines
15380 && !DECL_VINDEX (decl1
)));
15382 /* For WIN32 we also want to put these in linkonce sections. */
15383 maybe_make_one_only (decl1
);
15386 DECL_EXTERNAL (decl1
) = 0;
15387 DECL_INTERFACE_KNOWN (decl1
) = 1;
15388 /* If this function is in an interface implemented in this file,
15389 make sure that the back end knows to emit this function
15391 if (!DECL_EXTERNAL (decl1
))
15392 mark_needed (decl1
);
15394 else if (finfo
->interface_unknown
&& finfo
->interface_only
15395 && honor_interface
)
15397 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
15398 interface, we will have both finfo->interface_unknown and
15399 finfo->interface_only set. In that case, we don't want to
15400 use the normal heuristics because someone will supply a
15401 #pragma implementation elsewhere, and deducing it here would
15402 produce a conflict. */
15403 comdat_linkage (decl1
);
15404 DECL_EXTERNAL (decl1
) = 0;
15405 DECL_INTERFACE_KNOWN (decl1
) = 1;
15406 DECL_DEFER_OUTPUT (decl1
) = 1;
15410 /* This is a definition, not a reference.
15411 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
15412 if (!GNU_INLINE_P (decl1
))
15413 DECL_EXTERNAL (decl1
) = 0;
15415 if ((DECL_DECLARED_INLINE_P (decl1
)
15416 || DECL_TEMPLATE_INSTANTIATION (decl1
))
15417 && ! DECL_INTERFACE_KNOWN (decl1
))
15418 DECL_DEFER_OUTPUT (decl1
) = 1;
15420 DECL_INTERFACE_KNOWN (decl1
) = 1;
15423 /* Determine the ELF visibility attribute for the function. We must not
15424 do this before calling "pushdecl", as we must allow "duplicate_decls"
15425 to merge any attributes appropriately. We also need to wait until
15427 if (!DECL_CLONED_FUNCTION_P (decl1
))
15428 determine_visibility (decl1
);
15430 if (!processing_template_decl
)
15431 maybe_instantiate_noexcept (decl1
);
15433 begin_scope (sk_function_parms
, decl1
);
15437 if (DECL_DESTRUCTOR_P (decl1
)
15438 || (DECL_CONSTRUCTOR_P (decl1
)
15439 && targetm
.cxx
.cdtor_returns_this ()))
15441 cdtor_label
= create_artificial_label (input_location
);
15442 LABEL_DECL_CDTOR (cdtor_label
) = true;
15445 start_fname_decls ();
15447 store_parm_decls (current_function_parms
);
15449 if (!processing_template_decl
15450 && (flag_lifetime_dse
> 1)
15451 && DECL_CONSTRUCTOR_P (decl1
)
15452 && !DECL_CLONED_FUNCTION_P (decl1
)
15453 /* Clobbering an empty base is harmful if it overlays real data. */
15454 && !is_empty_class (current_class_type
)
15455 /* We can't clobber safely for an implicitly-defined default constructor
15456 because part of the initialization might happen before we enter the
15457 constructor, via AGGR_INIT_ZERO_FIRST (c++/68006). */
15458 && !implicit_default_ctor_p (decl1
))
15459 finish_expr_stmt (build_clobber_this ());
15461 if (!processing_template_decl
15462 && DECL_CONSTRUCTOR_P (decl1
)
15463 && sanitize_flags_p (SANITIZE_VPTR
)
15464 && !DECL_CLONED_FUNCTION_P (decl1
)
15465 && !implicit_default_ctor_p (decl1
))
15466 cp_ubsan_maybe_initialize_vtbl_ptrs (current_class_ptr
);
15468 start_lambda_scope (decl1
);
15474 /* Like start_preparsed_function, except that instead of a
15475 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
15477 Returns true on success. If the DECLARATOR is not suitable
15478 for a function, we return false, which tells the parser to
15479 skip the entire function. */
15482 start_function (cp_decl_specifier_seq
*declspecs
,
15483 const cp_declarator
*declarator
,
15488 decl1
= grokdeclarator (declarator
, declspecs
, FUNCDEF
, 1, &attrs
);
15489 invoke_plugin_callbacks (PLUGIN_START_PARSE_FUNCTION
, decl1
);
15490 if (decl1
== error_mark_node
)
15492 /* If the declarator is not suitable for a function definition,
15493 cause a syntax error. */
15494 if (decl1
== NULL_TREE
|| TREE_CODE (decl1
) != FUNCTION_DECL
)
15496 error ("invalid function declaration");
15500 if (DECL_MAIN_P (decl1
))
15501 /* main must return int. grokfndecl should have corrected it
15502 (and issued a diagnostic) if the user got it wrong. */
15503 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1
)),
15504 integer_type_node
));
15506 return start_preparsed_function (decl1
, attrs
, /*flags=*/SF_DEFAULT
);
15509 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
15513 use_eh_spec_block (tree fn
)
15515 return (flag_exceptions
&& flag_enforce_eh_specs
15516 && !processing_template_decl
15517 && !type_throw_all_p (TREE_TYPE (fn
))
15518 /* We insert the EH_SPEC_BLOCK only in the original
15519 function; then, it is copied automatically to the
15521 && !DECL_CLONED_FUNCTION_P (fn
)
15522 /* Implicitly-generated constructors and destructors have
15523 exception specifications. However, those specifications
15524 are the union of the possible exceptions specified by the
15525 constructors/destructors for bases and members, so no
15526 unallowed exception will ever reach this function. By
15527 not creating the EH_SPEC_BLOCK we save a little memory,
15528 and we avoid spurious warnings about unreachable
15530 && !DECL_DEFAULTED_FN (fn
));
15533 /* Store the parameter declarations into the current function declaration.
15534 This is called after parsing the parameter declarations, before
15535 digesting the body of the function.
15537 Also install to binding contour return value identifier, if any. */
15540 store_parm_decls (tree current_function_parms
)
15542 tree fndecl
= current_function_decl
;
15545 /* This is a chain of any other decls that came in among the parm
15546 declarations. If a parm is declared with enum {foo, bar} x;
15547 then CONST_DECLs for foo and bar are put here. */
15548 tree nonparms
= NULL_TREE
;
15550 if (current_function_parms
)
15552 /* This case is when the function was defined with an ANSI prototype.
15553 The parms already have decls, so we need not do anything here
15554 except record them as in effect
15555 and complain if any redundant old-style parm decls were written. */
15557 tree specparms
= current_function_parms
;
15560 /* Must clear this because it might contain TYPE_DECLs declared
15562 current_binding_level
->names
= NULL
;
15564 /* If we're doing semantic analysis, then we'll call pushdecl
15565 for each of these. We must do them in reverse order so that
15566 they end in the correct forward order. */
15567 specparms
= nreverse (specparms
);
15569 for (parm
= specparms
; parm
; parm
= next
)
15571 next
= DECL_CHAIN (parm
);
15572 if (TREE_CODE (parm
) == PARM_DECL
)
15576 /* If we find an enum constant or a type tag,
15577 put it aside for the moment. */
15578 TREE_CHAIN (parm
) = NULL_TREE
;
15579 nonparms
= chainon (nonparms
, parm
);
15583 /* Get the decls in their original chain order and record in the
15584 function. This is all and only the PARM_DECLs that were
15585 pushed into scope by the loop above. */
15586 DECL_ARGUMENTS (fndecl
) = get_local_decls ();
15589 DECL_ARGUMENTS (fndecl
) = NULL_TREE
;
15591 /* Now store the final chain of decls for the arguments
15592 as the decl-chain of the current lexical scope.
15593 Put the enumerators in as well, at the front so that
15594 DECL_ARGUMENTS is not modified. */
15595 current_binding_level
->names
= chainon (nonparms
, DECL_ARGUMENTS (fndecl
));
15597 if (use_eh_spec_block (current_function_decl
))
15598 current_eh_spec_block
= begin_eh_spec_block ();
15602 /* We have finished doing semantic analysis on DECL, but have not yet
15603 generated RTL for its body. Save away our current state, so that
15604 when we want to generate RTL later we know what to do. */
15607 save_function_data (tree decl
)
15609 struct language_function
*f
;
15611 /* Save the language-specific per-function data so that we can
15612 get it back when we really expand this function. */
15613 gcc_assert (!DECL_PENDING_INLINE_P (decl
));
15616 f
= ggc_alloc
<language_function
> ();
15617 memcpy (f
, cp_function_chain
, sizeof (struct language_function
));
15618 DECL_SAVED_FUNCTION_DATA (decl
) = f
;
15620 /* Clear out the bits we don't need. */
15621 f
->base
.x_stmt_tree
.x_cur_stmt_list
= NULL
;
15622 f
->bindings
= NULL
;
15623 f
->x_local_names
= NULL
;
15624 f
->base
.local_typedefs
= NULL
;
15628 /* Set the return value of the constructor (if present). */
15631 finish_constructor_body (void)
15636 if (targetm
.cxx
.cdtor_returns_this ())
15638 /* Any return from a constructor will end up here. */
15639 add_stmt (build_stmt (input_location
, LABEL_EXPR
, cdtor_label
));
15641 val
= DECL_ARGUMENTS (current_function_decl
);
15642 val
= build2 (MODIFY_EXPR
, TREE_TYPE (val
),
15643 DECL_RESULT (current_function_decl
), val
);
15644 /* Return the address of the object. */
15645 exprstmt
= build_stmt (input_location
, RETURN_EXPR
, val
);
15646 add_stmt (exprstmt
);
15650 /* Do all the processing for the beginning of a destructor; set up the
15651 vtable pointers and cleanups for bases and members. */
15654 begin_destructor_body (void)
15656 tree compound_stmt
;
15658 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
15659 issued an error message. We still want to try to process the
15660 body of the function, but initialize_vtbl_ptrs will crash if
15661 TYPE_BINFO is NULL. */
15662 if (COMPLETE_TYPE_P (current_class_type
))
15664 compound_stmt
= begin_compound_stmt (0);
15665 /* Make all virtual function table pointers in non-virtual base
15666 classes point to CURRENT_CLASS_TYPE's virtual function
15668 initialize_vtbl_ptrs (current_class_ptr
);
15669 finish_compound_stmt (compound_stmt
);
15671 if (flag_lifetime_dse
15672 /* Clobbering an empty base is harmful if it overlays real data. */
15673 && !is_empty_class (current_class_type
))
15675 if (sanitize_flags_p (SANITIZE_VPTR
)
15676 && (flag_sanitize_recover
& SANITIZE_VPTR
) == 0
15677 && TYPE_CONTAINS_VPTR_P (current_class_type
))
15679 tree binfo
= TYPE_BINFO (current_class_type
);
15681 = cp_build_fold_indirect_ref (current_class_ptr
);
15683 tree vtbl_ptr
= build_vfield_ref (ref
, TREE_TYPE (binfo
));
15684 tree vtbl
= build_zero_cst (TREE_TYPE (vtbl_ptr
));
15685 tree stmt
= cp_build_modify_expr (input_location
, vtbl_ptr
,
15687 tf_warning_or_error
);
15688 /* If the vptr is shared with some virtual nearly empty base,
15689 don't clear it if not in charge, the dtor of the virtual
15690 nearly empty base will do that later. */
15691 if (CLASSTYPE_VBASECLASSES (current_class_type
)
15692 && CLASSTYPE_PRIMARY_BINFO (current_class_type
)
15694 (CLASSTYPE_PRIMARY_BINFO (current_class_type
)))
15696 stmt
= convert_to_void (stmt
, ICV_STATEMENT
,
15697 tf_warning_or_error
);
15698 stmt
= build_if_in_charge (stmt
);
15700 finish_decl_cleanup (NULL_TREE
, stmt
);
15703 finish_decl_cleanup (NULL_TREE
, build_clobber_this ());
15706 /* And insert cleanups for our bases and members so that they
15707 will be properly destroyed if we throw. */
15708 push_base_cleanups ();
15712 /* At the end of every destructor we generate code to delete the object if
15713 necessary. Do that now. */
15716 finish_destructor_body (void)
15720 /* Any return from a destructor will end up here; that way all base
15721 and member cleanups will be run when the function returns. */
15722 add_stmt (build_stmt (input_location
, LABEL_EXPR
, cdtor_label
));
15724 if (targetm
.cxx
.cdtor_returns_this ())
15728 val
= DECL_ARGUMENTS (current_function_decl
);
15729 val
= build2 (MODIFY_EXPR
, TREE_TYPE (val
),
15730 DECL_RESULT (current_function_decl
), val
);
15731 /* Return the address of the object. */
15732 exprstmt
= build_stmt (input_location
, RETURN_EXPR
, val
);
15733 add_stmt (exprstmt
);
15737 /* Do the necessary processing for the beginning of a function body, which
15738 in this case includes member-initializers, but not the catch clauses of
15739 a function-try-block. Currently, this means opening a binding level
15740 for the member-initializers (in a ctor), member cleanups (in a dtor),
15741 and capture proxies (in a lambda operator()). */
15744 begin_function_body (void)
15748 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl
))
15751 if (processing_template_decl
)
15752 /* Do nothing now. */;
15754 /* Always keep the BLOCK node associated with the outermost pair of
15755 curly braces of a function. These are needed for correct
15756 operation of dwarfout.c. */
15757 keep_next_level (true);
15759 stmt
= begin_compound_stmt (BCS_FN_BODY
);
15761 if (processing_template_decl
)
15762 /* Do nothing now. */;
15763 else if (DECL_DESTRUCTOR_P (current_function_decl
))
15764 begin_destructor_body ();
15769 /* Do the processing for the end of a function body. Currently, this means
15770 closing out the cleanups for fully-constructed bases and members, and in
15771 the case of the destructor, deleting the object if desired. Again, this
15772 is only meaningful for [cd]tors, since they are the only functions where
15773 there is a significant distinction between the main body and any
15774 function catch clauses. Handling, say, main() return semantics here
15775 would be wrong, as flowing off the end of a function catch clause for
15776 main() would also need to return 0. */
15779 finish_function_body (tree compstmt
)
15781 if (compstmt
== NULL_TREE
)
15784 /* Close the block. */
15785 finish_compound_stmt (compstmt
);
15787 if (processing_template_decl
)
15788 /* Do nothing now. */;
15789 else if (DECL_CONSTRUCTOR_P (current_function_decl
))
15790 finish_constructor_body ();
15791 else if (DECL_DESTRUCTOR_P (current_function_decl
))
15792 finish_destructor_body ();
15795 /* Given a function, returns the BLOCK corresponding to the outermost level
15796 of curly braces, skipping the artificial block created for constructor
15800 outer_curly_brace_block (tree fndecl
)
15802 tree block
= DECL_INITIAL (fndecl
);
15803 if (BLOCK_OUTER_CURLY_BRACE_P (block
))
15805 block
= BLOCK_SUBBLOCKS (block
);
15806 if (BLOCK_OUTER_CURLY_BRACE_P (block
))
15808 block
= BLOCK_SUBBLOCKS (block
);
15809 gcc_assert (BLOCK_OUTER_CURLY_BRACE_P (block
));
15813 /* If FNDECL is a class's key method, add the class to the list of
15814 keyed classes that should be emitted. */
15817 record_key_method_defined (tree fndecl
)
15819 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl
)
15820 && DECL_VIRTUAL_P (fndecl
)
15821 && !processing_template_decl
)
15823 tree fnclass
= DECL_CONTEXT (fndecl
);
15824 if (fndecl
== CLASSTYPE_KEY_METHOD (fnclass
))
15825 vec_safe_push (keyed_classes
, fnclass
);
15829 /* Subroutine of finish_function.
15830 Save the body of constexpr functions for possible
15831 future compile time evaluation. */
15834 maybe_save_function_definition (tree fun
)
15836 if (!processing_template_decl
15837 && DECL_DECLARED_CONSTEXPR_P (fun
)
15838 && !cp_function_chain
->invalid_constexpr
15839 && !DECL_CLONED_FUNCTION_P (fun
))
15840 register_constexpr_fundef (fun
, DECL_SAVED_TREE (fun
));
15843 /* Attempt to add a fix-it hint to RICHLOC suggesting the insertion
15844 of "return *this;" immediately before its location, using FNDECL's
15845 first statement (if any) to give the indentation, if appropriate. */
15848 add_return_star_this_fixit (gcc_rich_location
*richloc
, tree fndecl
)
15850 location_t indent
= UNKNOWN_LOCATION
;
15851 tree stmts
= expr_first (DECL_SAVED_TREE (fndecl
));
15853 indent
= EXPR_LOCATION (stmts
);
15854 richloc
->add_fixit_insert_formatted ("return *this;",
15855 richloc
->get_loc (),
15859 /* Finish up a function declaration and compile that function
15860 all the way to assembler language output. The free the storage
15861 for the function definition. INLINE_P is TRUE if we just
15862 finished processing the body of an in-class inline function
15863 definition. (This processing will have taken place after the
15864 class definition is complete.) */
15867 finish_function (bool inline_p
)
15869 tree fndecl
= current_function_decl
;
15870 tree fntype
, ctype
= NULL_TREE
;
15872 /* When we get some parse errors, we can end up without a
15873 current_function_decl, so cope. */
15874 if (fndecl
== NULL_TREE
)
15875 return error_mark_node
;
15877 finish_lambda_scope ();
15879 if (c_dialect_objc ())
15880 objc_finish_function ();
15882 record_key_method_defined (fndecl
);
15884 fntype
= TREE_TYPE (fndecl
);
15886 /* TREE_READONLY (fndecl) = 1;
15887 This caused &foo to be of type ptr-to-const-function
15888 which then got a warning when stored in a ptr-to-function variable. */
15890 gcc_assert (building_stmt_list_p ());
15891 /* The current function is being defined, so its DECL_INITIAL should
15892 be set, and unless there's a multiple definition, it should be
15893 error_mark_node. */
15894 gcc_assert (DECL_INITIAL (fndecl
) == error_mark_node
);
15896 /* For a cloned function, we've already got all the code we need;
15897 there's no need to add any extra bits. */
15898 if (!DECL_CLONED_FUNCTION_P (fndecl
))
15900 /* Make it so that `main' always returns 0 by default. */
15901 if (DECL_MAIN_P (current_function_decl
))
15902 finish_return_stmt (integer_zero_node
);
15904 if (use_eh_spec_block (current_function_decl
))
15905 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
15906 (TREE_TYPE (current_function_decl
)),
15907 current_eh_spec_block
);
15910 /* If we're saving up tree structure, tie off the function now. */
15911 DECL_SAVED_TREE (fndecl
) = pop_stmt_list (DECL_SAVED_TREE (fndecl
));
15913 finish_fname_decls ();
15915 /* If this function can't throw any exceptions, remember that. */
15916 if (!processing_template_decl
15917 && !cp_function_chain
->can_throw
15918 && !flag_non_call_exceptions
15919 && !decl_replaceable_p (fndecl
))
15920 TREE_NOTHROW (fndecl
) = 1;
15922 /* This must come after expand_function_end because cleanups might
15923 have declarations (from inline functions) that need to go into
15924 this function's blocks. */
15926 /* If the current binding level isn't the outermost binding level
15927 for this function, either there is a bug, or we have experienced
15928 syntax errors and the statement tree is malformed. */
15929 if (current_binding_level
->kind
!= sk_function_parms
)
15931 /* Make sure we have already experienced errors. */
15932 gcc_assert (errorcount
);
15934 /* Throw away the broken statement tree and extra binding
15936 DECL_SAVED_TREE (fndecl
) = alloc_stmt_list ();
15938 while (current_binding_level
->kind
!= sk_function_parms
)
15940 if (current_binding_level
->kind
== sk_class
)
15941 pop_nested_class ();
15943 poplevel (0, 0, 0);
15946 poplevel (1, 0, 1);
15948 /* Statements should always be full-expressions at the outermost set
15949 of curly braces for a function. */
15950 gcc_assert (stmts_are_full_exprs_p ());
15952 /* If there are no return statements in a function with auto return type,
15953 the return type is void. But if the declared type is something like
15954 auto*, this is an error. */
15955 if (!processing_template_decl
&& FNDECL_USED_AUTO (fndecl
)
15956 && TREE_TYPE (fntype
) == current_function_auto_return_pattern
)
15958 if (is_auto (current_function_auto_return_pattern
))
15960 apply_deduced_return_type (fndecl
, void_type_node
);
15961 fntype
= TREE_TYPE (fndecl
);
15963 else if (!current_function_returns_value
15964 && !current_function_returns_null
)
15966 error ("no return statements in function returning %qT",
15967 current_function_auto_return_pattern
);
15968 inform (input_location
, "only plain %<auto%> return type can be "
15969 "deduced to %<void%>");
15973 // If this is a concept, check that the definition is reasonable.
15974 if (DECL_DECLARED_CONCEPT_P (fndecl
))
15975 check_function_concept (fndecl
);
15977 /* Lambda closure members are implicitly constexpr if possible. */
15978 if (cxx_dialect
>= cxx17
15979 && LAMBDA_TYPE_P (CP_DECL_CONTEXT (fndecl
)))
15980 DECL_DECLARED_CONSTEXPR_P (fndecl
)
15981 = ((processing_template_decl
15982 || is_valid_constexpr_fn (fndecl
, /*complain*/false))
15983 && potential_constant_expression (DECL_SAVED_TREE (fndecl
)));
15985 /* Save constexpr function body before it gets munged by
15986 the NRV transformation. */
15987 maybe_save_function_definition (fndecl
);
15989 /* Invoke the pre-genericize plugin before we start munging things. */
15990 if (!processing_template_decl
)
15991 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE
, fndecl
);
15993 /* Perform delayed folding before NRV transformation. */
15994 if (!processing_template_decl
)
15995 cp_fold_function (fndecl
);
15997 /* Set up the named return value optimization, if we can. Candidate
15998 variables are selected in check_return_expr. */
15999 if (current_function_return_value
)
16001 tree r
= current_function_return_value
;
16004 if (r
!= error_mark_node
16005 /* This is only worth doing for fns that return in memory--and
16006 simpler, since we don't have to worry about promoted modes. */
16007 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl
)), fndecl
)
16008 /* Only allow this for variables declared in the outer scope of
16009 the function so we know that their lifetime always ends with a
16010 return; see g++.dg/opt/nrv6.C. We could be more flexible if
16011 we were to do this optimization in tree-ssa. */
16012 && (outer
= outer_curly_brace_block (fndecl
))
16013 && chain_member (r
, BLOCK_VARS (outer
)))
16014 finalize_nrv (&DECL_SAVED_TREE (fndecl
), r
, DECL_RESULT (fndecl
));
16016 current_function_return_value
= NULL_TREE
;
16019 /* Remember that we were in class scope. */
16020 if (current_class_name
)
16021 ctype
= current_class_type
;
16023 /* Must mark the RESULT_DECL as being in this function. */
16024 DECL_CONTEXT (DECL_RESULT (fndecl
)) = fndecl
;
16026 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
16027 to the FUNCTION_DECL node itself. */
16028 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl
)) = fndecl
;
16030 /* Save away current state, if appropriate. */
16031 if (!processing_template_decl
)
16032 save_function_data (fndecl
);
16034 /* Complain if there's just no return statement. */
16035 if (warn_return_type
16036 && !VOID_TYPE_P (TREE_TYPE (fntype
))
16037 && !dependent_type_p (TREE_TYPE (fntype
))
16038 && !current_function_returns_value
&& !current_function_returns_null
16039 /* Don't complain if we abort or throw. */
16040 && !current_function_returns_abnormally
16041 /* Don't complain if there's an infinite loop. */
16042 && !current_function_infinite_loop
16043 /* Don't complain if we are declared noreturn. */
16044 && !TREE_THIS_VOLATILE (fndecl
)
16045 && !DECL_NAME (DECL_RESULT (fndecl
))
16046 && !TREE_NO_WARNING (fndecl
)
16047 /* Structor return values (if any) are set by the compiler. */
16048 && !DECL_CONSTRUCTOR_P (fndecl
)
16049 && !DECL_DESTRUCTOR_P (fndecl
)
16050 && targetm
.warn_func_return (fndecl
))
16052 gcc_rich_location
richloc (input_location
);
16053 /* Potentially add a "return *this;" fix-it hint for
16054 assignment operators. */
16055 if (IDENTIFIER_ASSIGN_OP_P (DECL_NAME (fndecl
)))
16057 tree valtype
= TREE_TYPE (DECL_RESULT (fndecl
));
16058 if (TREE_CODE (valtype
) == REFERENCE_TYPE
16059 && same_type_ignoring_top_level_qualifiers_p
16060 (TREE_TYPE (valtype
), TREE_TYPE (current_class_ref
)))
16061 if (global_dc
->option_enabled (OPT_Wreturn_type
,
16062 global_dc
->option_state
))
16063 add_return_star_this_fixit (&richloc
, fndecl
);
16065 warning_at (&richloc
, OPT_Wreturn_type
,
16066 "no return statement in function returning non-void");
16067 TREE_NO_WARNING (fndecl
) = 1;
16070 /* Store the end of the function, so that we get good line number
16071 info for the epilogue. */
16072 cfun
->function_end_locus
= input_location
;
16074 /* Complain about parameters that are only set, but never otherwise used. */
16075 if (warn_unused_but_set_parameter
16076 && !processing_template_decl
16077 && errorcount
== unused_but_set_errorcount
16078 && !DECL_CLONED_FUNCTION_P (fndecl
))
16082 for (decl
= DECL_ARGUMENTS (fndecl
);
16084 decl
= DECL_CHAIN (decl
))
16085 if (TREE_USED (decl
)
16086 && TREE_CODE (decl
) == PARM_DECL
16087 && !DECL_READ_P (decl
)
16088 && DECL_NAME (decl
)
16089 && !DECL_ARTIFICIAL (decl
)
16090 && !TREE_NO_WARNING (decl
)
16091 && !DECL_IN_SYSTEM_HEADER (decl
)
16092 && TREE_TYPE (decl
) != error_mark_node
16093 && !TYPE_REF_P (TREE_TYPE (decl
))
16094 && (!CLASS_TYPE_P (TREE_TYPE (decl
))
16095 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl
))))
16096 warning_at (DECL_SOURCE_LOCATION (decl
),
16097 OPT_Wunused_but_set_parameter
,
16098 "parameter %qD set but not used", decl
);
16099 unused_but_set_errorcount
= errorcount
;
16102 /* Complain about locally defined typedefs that are not used in this
16104 maybe_warn_unused_local_typedefs ();
16106 /* Possibly warn about unused parameters. */
16107 if (warn_unused_parameter
16108 && !processing_template_decl
16109 && !DECL_CLONED_FUNCTION_P (fndecl
))
16110 do_warn_unused_parameter (fndecl
);
16112 /* Genericize before inlining. */
16113 if (!processing_template_decl
)
16115 struct language_function
*f
= DECL_SAVED_FUNCTION_DATA (fndecl
);
16116 cp_genericize (fndecl
);
16117 /* Clear out the bits we don't need. */
16118 f
->x_current_class_ptr
= NULL
;
16119 f
->x_current_class_ref
= NULL
;
16120 f
->x_eh_spec_block
= NULL
;
16121 f
->x_in_charge_parm
= NULL
;
16122 f
->x_vtt_parm
= NULL
;
16123 f
->x_return_value
= NULL
;
16124 f
->bindings
= NULL
;
16125 f
->extern_decl_map
= NULL
;
16126 f
->infinite_loops
= NULL
;
16128 /* Clear out the bits we don't need. */
16129 local_names
= NULL
;
16131 /* We're leaving the context of this function, so zap cfun. It's still in
16132 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
16134 current_function_decl
= NULL
;
16136 /* If this is an in-class inline definition, we may have to pop the
16137 bindings for the template parameters that we added in
16138 maybe_begin_member_template_processing when start_function was
16141 maybe_end_member_template_processing ();
16143 /* Leave the scope of the class. */
16145 pop_nested_class ();
16150 current_function_decl
= NULL_TREE
;
16152 invoke_plugin_callbacks (PLUGIN_FINISH_PARSE_FUNCTION
, fndecl
);
16156 /* Create the FUNCTION_DECL for a function definition.
16157 DECLSPECS and DECLARATOR are the parts of the declaration;
16158 they describe the return type and the name of the function,
16159 but twisted together in a fashion that parallels the syntax of C.
16161 This function creates a binding context for the function body
16162 as well as setting up the FUNCTION_DECL in current_function_decl.
16164 Returns a FUNCTION_DECL on success.
16166 If the DECLARATOR is not suitable for a function (it defines a datum
16167 instead), we return 0, which tells yyparse to report a parse error.
16169 May return void_type_node indicating that this method is actually
16170 a friend. See grokfield for more details.
16172 Came here with a `.pushlevel' .
16174 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
16175 CHANGES TO CODE IN `grokfield'. */
16178 grokmethod (cp_decl_specifier_seq
*declspecs
,
16179 const cp_declarator
*declarator
, tree attrlist
)
16181 tree fndecl
= grokdeclarator (declarator
, declspecs
, MEMFUNCDEF
, 0,
16184 if (fndecl
== error_mark_node
)
16185 return error_mark_node
;
16187 if (fndecl
== NULL
|| TREE_CODE (fndecl
) != FUNCTION_DECL
)
16189 error ("invalid member function declaration");
16190 return error_mark_node
;
16194 cplus_decl_attributes (&fndecl
, attrlist
, 0);
16196 /* Pass friends other than inline friend functions back. */
16197 if (fndecl
== void_type_node
)
16200 if (DECL_IN_AGGR_P (fndecl
))
16202 if (DECL_CLASS_SCOPE_P (fndecl
))
16203 error ("%qD is already defined in class %qT", fndecl
,
16204 DECL_CONTEXT (fndecl
));
16205 return error_mark_node
;
16208 check_template_shadow (fndecl
);
16210 if (TREE_PUBLIC (fndecl
))
16211 DECL_COMDAT (fndecl
) = 1;
16212 DECL_DECLARED_INLINE_P (fndecl
) = 1;
16213 DECL_NO_INLINE_WARNING_P (fndecl
) = 1;
16215 /* We process method specializations in finish_struct_1. */
16216 if (processing_template_decl
&& !DECL_TEMPLATE_SPECIALIZATION (fndecl
))
16218 fndecl
= push_template_decl (fndecl
);
16219 if (fndecl
== error_mark_node
)
16223 if (! DECL_FRIEND_P (fndecl
))
16225 if (DECL_CHAIN (fndecl
))
16227 fndecl
= copy_node (fndecl
);
16228 TREE_CHAIN (fndecl
) = NULL_TREE
;
16232 cp_finish_decl (fndecl
, NULL_TREE
, false, NULL_TREE
, 0);
16234 DECL_IN_AGGR_P (fndecl
) = 1;
16239 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
16240 we can lay it out later, when and if its type becomes complete.
16242 Also handle constexpr variables where the initializer involves
16243 an unlowered PTRMEM_CST because the class isn't complete yet. */
16246 maybe_register_incomplete_var (tree var
)
16248 gcc_assert (VAR_P (var
));
16250 /* Keep track of variables with incomplete types. */
16251 if (!processing_template_decl
&& TREE_TYPE (var
) != error_mark_node
16252 && DECL_EXTERNAL (var
))
16254 tree inner_type
= TREE_TYPE (var
);
16256 while (TREE_CODE (inner_type
) == ARRAY_TYPE
)
16257 inner_type
= TREE_TYPE (inner_type
);
16258 inner_type
= TYPE_MAIN_VARIANT (inner_type
);
16260 if ((!COMPLETE_TYPE_P (inner_type
) && CLASS_TYPE_P (inner_type
))
16261 /* RTTI TD entries are created while defining the type_info. */
16262 || (TYPE_LANG_SPECIFIC (inner_type
)
16263 && TYPE_BEING_DEFINED (inner_type
)))
16265 incomplete_var iv
= {var
, inner_type
};
16266 vec_safe_push (incomplete_vars
, iv
);
16268 else if (!(DECL_LANG_SPECIFIC (var
) && DECL_TEMPLATE_INFO (var
))
16269 && decl_constant_var_p (var
)
16270 && (TYPE_PTRMEM_P (inner_type
) || CLASS_TYPE_P (inner_type
)))
16272 /* When the outermost open class is complete we can resolve any
16273 pointers-to-members. */
16274 tree context
= outermost_open_class ();
16275 incomplete_var iv
= {var
, context
};
16276 vec_safe_push (incomplete_vars
, iv
);
16281 /* Called when a class type (given by TYPE) is defined. If there are
16282 any existing VAR_DECLs whose type has been completed by this
16283 declaration, update them now. */
16286 complete_vars (tree type
)
16289 incomplete_var
*iv
;
16291 for (ix
= 0; vec_safe_iterate (incomplete_vars
, ix
, &iv
); )
16293 if (same_type_p (type
, iv
->incomplete_type
))
16295 tree var
= iv
->decl
;
16296 tree type
= TREE_TYPE (var
);
16298 if (type
!= error_mark_node
16299 && (TYPE_MAIN_VARIANT (strip_array_types (type
))
16300 == iv
->incomplete_type
))
16302 /* Complete the type of the variable. The VAR_DECL itself
16303 will be laid out in expand_expr. */
16304 complete_type (type
);
16305 cp_apply_type_quals_to_decl (cp_type_quals (type
), var
);
16308 /* Remove this entry from the list. */
16309 incomplete_vars
->unordered_remove (ix
);
16315 /* Check for pending declarations which may have abstract type. */
16316 complete_type_check_abstract (type
);
16319 /* If DECL is of a type which needs a cleanup, build and return an
16320 expression to perform that cleanup here. Return NULL_TREE if no
16321 cleanup need be done. DECL can also be a _REF when called from
16322 split_nonconstant_init_1. */
16325 cxx_maybe_build_cleanup (tree decl
, tsubst_flags_t complain
)
16331 /* Assume no cleanup is required. */
16332 cleanup
= NULL_TREE
;
16334 if (error_operand_p (decl
))
16337 /* Handle "__attribute__((cleanup))". We run the cleanup function
16338 before the destructor since the destructor is what actually
16339 terminates the lifetime of the object. */
16341 attr
= lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl
));
16350 /* Get the name specified by the user for the cleanup function. */
16351 id
= TREE_VALUE (TREE_VALUE (attr
));
16352 /* Look up the name to find the cleanup function to call. It is
16353 important to use lookup_name here because that is what is
16354 used in c-common.c:handle_cleanup_attribute when performing
16355 initial checks on the attribute. Note that those checks
16356 include ensuring that the function found is not an overloaded
16357 function, or an object with an overloaded call operator,
16358 etc.; we can rely on the fact that the function found is an
16359 ordinary FUNCTION_DECL. */
16360 fn
= lookup_name (id
);
16361 arg
= build_address (decl
);
16362 if (!mark_used (decl
, complain
) && !(complain
& tf_error
))
16363 return error_mark_node
;
16364 cleanup
= cp_build_function_call_nary (fn
, complain
, arg
, NULL_TREE
);
16365 if (cleanup
== error_mark_node
)
16366 return error_mark_node
;
16368 /* Handle ordinary C++ destructors. */
16369 type
= TREE_TYPE (decl
);
16370 if (type_build_dtor_call (type
))
16372 int flags
= LOOKUP_NORMAL
|LOOKUP_NONVIRTUAL
|LOOKUP_DESTRUCTOR
;
16376 if (TREE_CODE (type
) == ARRAY_TYPE
)
16379 addr
= build_address (decl
);
16381 call
= build_delete (TREE_TYPE (addr
), addr
,
16382 sfk_complete_destructor
, flags
, 0, complain
);
16383 if (call
== error_mark_node
)
16384 cleanup
= error_mark_node
;
16385 else if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type
))
16386 /* Discard the call. */;
16388 cleanup
= cp_build_compound_expr (cleanup
, call
, complain
);
16393 /* build_delete sets the location of the destructor call to the
16394 current location, even though the destructor is going to be
16395 called later, at the end of the current scope. This can lead to
16396 a "jumpy" behavior for users of debuggers when they step around
16397 the end of the block. So let's unset the location of the
16398 destructor call instead. */
16399 protected_set_expr_location (cleanup
, UNKNOWN_LOCATION
);
16403 && !lookup_attribute ("warn_unused", TYPE_ATTRIBUTES (TREE_TYPE (decl
)))
16404 /* Treat objects with destructors as used; the destructor may do
16405 something substantive. */
16406 && !mark_used (decl
, complain
) && !(complain
& tf_error
))
16407 return error_mark_node
;
16413 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
16414 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
16415 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
16418 static_fn_type (tree memfntype
)
16423 if (TYPE_PTRMEMFUNC_P (memfntype
))
16424 memfntype
= TYPE_PTRMEMFUNC_FN_TYPE (memfntype
);
16425 if (INDIRECT_TYPE_P (memfntype
)
16426 || TREE_CODE (memfntype
) == FUNCTION_DECL
)
16427 memfntype
= TREE_TYPE (memfntype
);
16428 if (TREE_CODE (memfntype
) == FUNCTION_TYPE
)
16430 gcc_assert (TREE_CODE (memfntype
) == METHOD_TYPE
);
16431 args
= TYPE_ARG_TYPES (memfntype
);
16432 fntype
= build_function_type (TREE_TYPE (memfntype
), TREE_CHAIN (args
));
16433 fntype
= apply_memfn_quals (fntype
, type_memfn_quals (memfntype
));
16434 fntype
= (cp_build_type_attribute_variant
16435 (fntype
, TYPE_ATTRIBUTES (memfntype
)));
16436 fntype
= cxx_copy_lang_qualifiers (fntype
, memfntype
);
16440 /* DECL was originally constructed as a non-static member function,
16441 but turned out to be static. Update it accordingly. */
16444 revert_static_member_fn (tree decl
)
16446 tree stype
= static_fn_type (decl
);
16447 cp_cv_quals quals
= type_memfn_quals (stype
);
16448 cp_ref_qualifier rqual
= type_memfn_rqual (stype
);
16450 if (quals
!= TYPE_UNQUALIFIED
|| rqual
!= REF_QUAL_NONE
)
16451 stype
= apply_memfn_quals (stype
, TYPE_UNQUALIFIED
, REF_QUAL_NONE
);
16453 TREE_TYPE (decl
) = stype
;
16455 if (DECL_ARGUMENTS (decl
))
16456 DECL_ARGUMENTS (decl
) = DECL_CHAIN (DECL_ARGUMENTS (decl
));
16457 DECL_STATIC_FUNCTION_P (decl
) = 1;
16460 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
16461 one of the language-independent trees. */
16463 enum cp_tree_node_structure_enum
16464 cp_tree_node_structure (union lang_tree_node
* t
)
16466 switch (TREE_CODE (&t
->generic
))
16468 case DEFAULT_ARG
: return TS_CP_DEFAULT_ARG
;
16469 case DEFERRED_NOEXCEPT
: return TS_CP_DEFERRED_NOEXCEPT
;
16470 case IDENTIFIER_NODE
: return TS_CP_IDENTIFIER
;
16471 case OVERLOAD
: return TS_CP_OVERLOAD
;
16472 case TEMPLATE_PARM_INDEX
: return TS_CP_TPI
;
16473 case PTRMEM_CST
: return TS_CP_PTRMEM
;
16474 case BASELINK
: return TS_CP_BASELINK
;
16475 case TEMPLATE_DECL
: return TS_CP_TEMPLATE_DECL
;
16476 case STATIC_ASSERT
: return TS_CP_STATIC_ASSERT
;
16477 case ARGUMENT_PACK_SELECT
: return TS_CP_ARGUMENT_PACK_SELECT
;
16478 case TRAIT_EXPR
: return TS_CP_TRAIT_EXPR
;
16479 case LAMBDA_EXPR
: return TS_CP_LAMBDA_EXPR
;
16480 case TEMPLATE_INFO
: return TS_CP_TEMPLATE_INFO
;
16481 case CONSTRAINT_INFO
: return TS_CP_CONSTRAINT_INFO
;
16482 case USERDEF_LITERAL
: return TS_CP_USERDEF_LITERAL
;
16483 default: return TS_CP_GENERIC
;
16487 /* Build the void_list_node (void_type_node having been created). */
16489 build_void_list_node (void)
16491 tree t
= build_tree_list (NULL_TREE
, void_type_node
);
16496 cp_missing_noreturn_ok_p (tree decl
)
16498 /* A missing noreturn is ok for the `main' function. */
16499 return DECL_MAIN_P (decl
);
16502 /* Return the decl used to identify the COMDAT group into which DECL should
16506 cxx_comdat_group (tree decl
)
16508 /* Virtual tables, construction virtual tables, and virtual table
16509 tables all go in a single COMDAT group, named after the primary
16511 if (VAR_P (decl
) && DECL_VTABLE_OR_VTT_P (decl
))
16512 decl
= CLASSTYPE_VTABLES (DECL_CONTEXT (decl
));
16513 /* For all other DECLs, the COMDAT group is the mangled name of the
16514 declaration itself. */
16517 while (DECL_THUNK_P (decl
))
16519 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
16520 into the same section as the target function. In that case
16521 we must return target's name. */
16522 tree target
= THUNK_TARGET (decl
);
16523 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target
)
16524 && DECL_SECTION_NAME (target
) != NULL
16525 && DECL_ONE_ONLY (target
))
16535 /* Returns the return type for FN as written by the user, which may include
16536 a placeholder for a deduced return type. */
16539 fndecl_declared_return_type (tree fn
)
16541 fn
= STRIP_TEMPLATE (fn
);
16542 if (FNDECL_USED_AUTO (fn
))
16544 struct language_function
*f
= NULL
;
16545 if (DECL_STRUCT_FUNCTION (fn
))
16546 f
= DECL_STRUCT_FUNCTION (fn
)->language
;
16548 f
= DECL_SAVED_FUNCTION_DATA (fn
);
16549 return f
->x_auto_return_pattern
;
16551 return TREE_TYPE (TREE_TYPE (fn
));
16554 /* Returns true iff DECL is a variable or function declared with an auto type
16555 that has not yet been deduced to a real type. */
16558 undeduced_auto_decl (tree decl
)
16560 if (cxx_dialect
< cxx11
)
16562 return ((VAR_OR_FUNCTION_DECL_P (decl
)
16563 || TREE_CODE (decl
) == TEMPLATE_DECL
)
16564 && type_uses_auto (TREE_TYPE (decl
)));
16567 /* Complain if DECL has an undeduced return type. */
16570 require_deduced_type (tree decl
, tsubst_flags_t complain
)
16572 if (undeduced_auto_decl (decl
))
16574 if (complain
& tf_error
)
16575 error ("use of %qD before deduction of %<auto%>", decl
);
16581 /* Create a representation of the explicit-specifier with
16582 constant-expression of EXPR. COMPLAIN is as for tsubst. */
16585 build_explicit_specifier (tree expr
, tsubst_flags_t complain
)
16587 if (processing_template_decl
&& value_dependent_expression_p (expr
))
16588 /* Wait for instantiation, tsubst_function_decl will handle it. */
16591 expr
= build_converted_constant_expr (boolean_type_node
, expr
, complain
);
16592 expr
= instantiate_non_dependent_expr (expr
);
16593 expr
= cxx_constant_value (expr
);
16597 #include "gt-cp-decl.h"