1 /* Process declarations and variables for -*- C++ -*- compiler.
2 Copyright (C) 1988-2020 Free Software Foundation, Inc.
3 Contributed by Michael Tiemann (tiemann@cygnus.com)
4
5 This file is part of GCC.
6
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)
10 any later version.
11
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.
16
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/>. */
20
21
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. */
25
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
28
29 #include "config.h"
30 #include "system.h"
31 #include "coretypes.h"
32 #include "target.h"
33 #include "c-family/c-target.h"
34 #include "cp-tree.h"
35 #include "timevar.h"
36 #include "stringpool.h"
37 #include "cgraph.h"
38 #include "stor-layout.h"
39 #include "varasm.h"
40 #include "attribs.h"
41 #include "flags.h"
42 #include "tree-iterator.h"
43 #include "decl.h"
44 #include "intl.h"
45 #include "toplev.h"
46 #include "c-family/c-objc.h"
47 #include "c-family/c-pragma.h"
48 #include "c-family/c-ubsan.h"
49 #include "debug.h"
50 #include "plugin.h"
51 #include "builtins.h"
52 #include "gimplify.h"
53 #include "asan.h"
54 #include "gcc-rich-location.h"
55 #include "langhooks.h"
56 #include "omp-general.h"
57
58 /* Possible cases of bad specifiers type used by bad_specifiers. */
59 enum bad_spec_place {
60 BSP_VAR, /* variable */
61 BSP_PARM, /* parameter */
62 BSP_TYPE, /* type */
63 BSP_FIELD /* field */
64 };
65
66 static const char *redeclaration_error_message (tree, tree);
67
68 static int decl_jump_unsafe (tree);
69 static void require_complete_types_for_parms (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, location_t);
73 static void check_static_variable_definition (tree, tree);
74 static void record_unknown_type (tree, const char *);
75 static int member_function_or_else (tree, tree, enum overload_flags);
76 static tree local_variable_p_walkfn (tree *, int *, void *);
77 static const char *tag_name (enum tag_types);
78 static tree lookup_and_check_tag (enum tag_types, tree, tag_scope, bool);
79 static void maybe_deduce_size_from_array_init (tree, tree);
80 static void layout_var_decl (tree);
81 static tree check_initializer (tree, tree, int, vec<tree, va_gc> **);
82 static void make_rtl_for_nonlocal_decl (tree, tree, const char *);
83 static void copy_type_enum (tree , tree);
84 static void check_function_type (tree, tree);
85 static void finish_constructor_body (void);
86 static void begin_destructor_body (void);
87 static void finish_destructor_body (void);
88 static void record_key_method_defined (tree);
89 static tree create_array_type_for_decl (tree, tree, tree, location_t);
90 static tree get_atexit_node (void);
91 static tree get_dso_handle_node (void);
92 static tree start_cleanup_fn (void);
93 static void end_cleanup_fn (void);
94 static tree cp_make_fname_decl (location_t, tree, int);
95 static void initialize_predefined_identifiers (void);
96 static tree check_special_function_return_type
97 (special_function_kind, tree, tree, int, const location_t*);
98 static tree push_cp_library_fn (enum tree_code, tree, int);
99 static tree build_cp_library_fn (tree, enum tree_code, tree, int);
100 static void store_parm_decls (tree);
101 static void initialize_local_var (tree, tree);
102 static void expand_static_init (tree, tree);
103 static location_t smallest_type_location (const cp_decl_specifier_seq*);
104
105 /* The following symbols are subsumed in the cp_global_trees array, and
106 listed here individually for documentation purposes.
107
108 C++ extensions
109 tree wchar_decl_node;
110
111 tree vtable_entry_type;
112 tree delta_type_node;
113 tree __t_desc_type_node;
114
115 tree class_type_node;
116 tree unknown_type_node;
117
118 Array type `vtable_entry_type[]'
119
120 tree vtbl_type_node;
121 tree vtbl_ptr_type_node;
122
123 Namespaces,
124
125 tree std_node;
126 tree abi_node;
127
128 A FUNCTION_DECL which can call `abort'. Not necessarily the
129 one that the user will declare, but sufficient to be called
130 by routines that want to abort the program.
131
132 tree abort_fndecl;
133
134 Used by RTTI
135 tree type_info_type_node, tinfo_decl_id, tinfo_decl_type;
136 tree tinfo_var_id; */
137
138 tree cp_global_trees[CPTI_MAX];
139
140 /* A list of objects which have constructors or destructors
141 which reside in the global scope. The decl is stored in
142 the TREE_VALUE slot and the initializer is stored
143 in the TREE_PURPOSE slot. */
144 tree static_aggregates;
145
146 /* Like static_aggregates, but for thread_local variables. */
147 tree tls_aggregates;
148
149 /* -- end of C++ */
150
151 /* A node for the integer constant 2. */
152
153 tree integer_two_node;
154
155 /* vector of static decls. */
156 vec<tree, va_gc> *static_decls;
157
158 /* vector of keyed classes. */
159 vec<tree, va_gc> *keyed_classes;
160
161 /* Used only for jumps to as-yet undefined labels, since jumps to
162 defined labels can have their validity checked immediately. */
163
164 struct GTY((chain_next ("%h.next"))) named_label_use_entry {
165 struct named_label_use_entry *next;
166 /* The binding level to which this entry is *currently* attached.
167 This is initially the binding level in which the goto appeared,
168 but is modified as scopes are closed. */
169 cp_binding_level *binding_level;
170 /* The head of the names list that was current when the goto appeared,
171 or the inner scope popped. These are the decls that will *not* be
172 skipped when jumping to the label. */
173 tree names_in_scope;
174 /* The location of the goto, for error reporting. */
175 location_t o_goto_locus;
176 /* True if an OpenMP structured block scope has been closed since
177 the goto appeared. This means that the branch from the label will
178 illegally exit an OpenMP scope. */
179 bool in_omp_scope;
180 };
181
182 /* A list of all LABEL_DECLs in the function that have names. Here so
183 we can clear out their names' definitions at the end of the
184 function, and so we can check the validity of jumps to these labels. */
185
186 struct GTY((for_user)) named_label_entry {
187
188 tree name; /* Name of decl. */
189
190 tree label_decl; /* LABEL_DECL, unless deleted local label. */
191
192 named_label_entry *outer; /* Outer shadowed chain. */
193
194 /* The binding level to which the label is *currently* attached.
195 This is initially set to the binding level in which the label
196 is defined, but is modified as scopes are closed. */
197 cp_binding_level *binding_level;
198
199 /* The head of the names list that was current when the label was
200 defined, or the inner scope popped. These are the decls that will
201 be skipped when jumping to the label. */
202 tree names_in_scope;
203
204 /* A vector of all decls from all binding levels that would be
205 crossed by a backward branch to the label. */
206 vec<tree, va_gc> *bad_decls;
207
208 /* A list of uses of the label, before the label is defined. */
209 named_label_use_entry *uses;
210
211 /* The following bits are set after the label is defined, and are
212 updated as scopes are popped. They indicate that a jump to the
213 label will illegally enter a scope of the given flavor. */
214 bool in_try_scope;
215 bool in_catch_scope;
216 bool in_omp_scope;
217 bool in_transaction_scope;
218 bool in_constexpr_if;
219 };
220
221 #define named_labels cp_function_chain->x_named_labels
222
223 /* The number of function bodies which we are currently processing.
224 (Zero if we are at namespace scope, one inside the body of a
225 function, two inside the body of a function in a local class, etc.) */
226 int function_depth;
227
228 /* Whether the exception-specifier is part of a function type (i.e. C++17). */
229 bool flag_noexcept_type;
230
231 /* States indicating how grokdeclarator() should handle declspecs marked
232 with __attribute__((deprecated)). An object declared as
233 __attribute__((deprecated)) suppresses warnings of uses of other
234 deprecated items. */
235 enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
236
237
238 /* A list of VAR_DECLs whose type was incomplete at the time the
239 variable was declared. */
240
241 struct GTY(()) incomplete_var {
242 tree decl;
243 tree incomplete_type;
244 };
245
246
247 static GTY(()) vec<incomplete_var, va_gc> *incomplete_vars;
248
249 /* Returns the kind of template specialization we are currently
250 processing, given that it's declaration contained N_CLASS_SCOPES
251 explicit scope qualifications. */
252
253 tmpl_spec_kind
current_tmpl_spec_kind(int n_class_scopes)254 current_tmpl_spec_kind (int n_class_scopes)
255 {
256 int n_template_parm_scopes = 0;
257 int seen_specialization_p = 0;
258 int innermost_specialization_p = 0;
259 cp_binding_level *b;
260
261 /* Scan through the template parameter scopes. */
262 for (b = current_binding_level;
263 b->kind == sk_template_parms;
264 b = b->level_chain)
265 {
266 /* If we see a specialization scope inside a parameter scope,
267 then something is wrong. That corresponds to a declaration
268 like:
269
270 template <class T> template <> ...
271
272 which is always invalid since [temp.expl.spec] forbids the
273 specialization of a class member template if the enclosing
274 class templates are not explicitly specialized as well. */
275 if (b->explicit_spec_p)
276 {
277 if (n_template_parm_scopes == 0)
278 innermost_specialization_p = 1;
279 else
280 seen_specialization_p = 1;
281 }
282 else if (seen_specialization_p == 1)
283 return tsk_invalid_member_spec;
284
285 ++n_template_parm_scopes;
286 }
287
288 /* Handle explicit instantiations. */
289 if (processing_explicit_instantiation)
290 {
291 if (n_template_parm_scopes != 0)
292 /* We've seen a template parameter list during an explicit
293 instantiation. For example:
294
295 template <class T> template void f(int);
296
297 This is erroneous. */
298 return tsk_invalid_expl_inst;
299 else
300 return tsk_expl_inst;
301 }
302
303 if (n_template_parm_scopes < n_class_scopes)
304 /* We've not seen enough template headers to match all the
305 specialized classes present. For example:
306
307 template <class T> void R<T>::S<T>::f(int);
308
309 This is invalid; there needs to be one set of template
310 parameters for each class. */
311 return tsk_insufficient_parms;
312 else if (n_template_parm_scopes == n_class_scopes)
313 /* We're processing a non-template declaration (even though it may
314 be a member of a template class.) For example:
315
316 template <class T> void S<T>::f(int);
317
318 The `class T' matches the `S<T>', leaving no template headers
319 corresponding to the `f'. */
320 return tsk_none;
321 else if (n_template_parm_scopes > n_class_scopes + 1)
322 /* We've got too many template headers. For example:
323
324 template <> template <class T> void f (T);
325
326 There need to be more enclosing classes. */
327 return tsk_excessive_parms;
328 else
329 /* This must be a template. It's of the form:
330
331 template <class T> template <class U> void S<T>::f(U);
332
333 This is a specialization if the innermost level was a
334 specialization; otherwise it's just a definition of the
335 template. */
336 return innermost_specialization_p ? tsk_expl_spec : tsk_template;
337 }
338
339 /* Exit the current scope. */
340
341 void
finish_scope(void)342 finish_scope (void)
343 {
344 poplevel (0, 0, 0);
345 }
346
347 /* When a label goes out of scope, check to see if that label was used
348 in a valid manner, and issue any appropriate warnings or errors. */
349
350 static void
check_label_used(tree label)351 check_label_used (tree label)
352 {
353 if (!processing_template_decl)
354 {
355 if (DECL_INITIAL (label) == NULL_TREE)
356 {
357 location_t location;
358
359 error ("label %q+D used but not defined", label);
360 location = input_location;
361 /* FIXME want (LOCATION_FILE (input_location), (line)0) */
362 /* Avoid crashing later. */
363 define_label (location, DECL_NAME (label));
364 }
365 else
366 warn_for_unused_label (label);
367 }
368 }
369
370 /* Helper function to sort named label entries in a vector by DECL_UID. */
371
372 static int
sort_labels(const void * a,const void * b)373 sort_labels (const void *a, const void *b)
374 {
375 tree label1 = *(tree const *) a;
376 tree label2 = *(tree const *) b;
377
378 /* DECL_UIDs can never be equal. */
379 return DECL_UID (label1) > DECL_UID (label2) ? -1 : +1;
380 }
381
382 /* At the end of a function, all labels declared within the function
383 go out of scope. BLOCK is the top-level block for the
384 function. */
385
386 static void
pop_labels(tree block)387 pop_labels (tree block)
388 {
389 if (!named_labels)
390 return;
391
392 /* We need to add the labels to the block chain, so debug
393 information is emitted. But, we want the order to be stable so
394 need to sort them first. Otherwise the debug output could be
395 randomly ordered. I guess it's mostly stable, unless the hash
396 table implementation changes. */
397 auto_vec<tree, 32> labels (named_labels->elements ());
398 hash_table<named_label_hash>::iterator end (named_labels->end ());
399 for (hash_table<named_label_hash>::iterator iter
400 (named_labels->begin ()); iter != end; ++iter)
401 {
402 named_label_entry *ent = *iter;
403
404 gcc_checking_assert (!ent->outer);
405 if (ent->label_decl)
406 labels.quick_push (ent->label_decl);
407 ggc_free (ent);
408 }
409 named_labels = NULL;
410 labels.qsort (sort_labels);
411
412 while (labels.length ())
413 {
414 tree label = labels.pop ();
415
416 DECL_CHAIN (label) = BLOCK_VARS (block);
417 BLOCK_VARS (block) = label;
418
419 check_label_used (label);
420 }
421 }
422
423 /* At the end of a block with local labels, restore the outer definition. */
424
425 static void
pop_local_label(tree id,tree label)426 pop_local_label (tree id, tree label)
427 {
428 check_label_used (label);
429 named_label_entry **slot = named_labels->find_slot_with_hash
430 (id, IDENTIFIER_HASH_VALUE (id), NO_INSERT);
431 named_label_entry *ent = *slot;
432
433 if (ent->outer)
434 ent = ent->outer;
435 else
436 {
437 ent = ggc_cleared_alloc<named_label_entry> ();
438 ent->name = id;
439 }
440 *slot = ent;
441 }
442
443 /* The following two routines are used to interface to Objective-C++.
444 The binding level is purposely treated as an opaque type. */
445
446 void *
objc_get_current_scope(void)447 objc_get_current_scope (void)
448 {
449 return current_binding_level;
450 }
451
452 /* The following routine is used by the NeXT-style SJLJ exceptions;
453 variables get marked 'volatile' so as to not be clobbered by
454 _setjmp()/_longjmp() calls. All variables in the current scope,
455 as well as parent scopes up to (but not including) ENCLOSING_BLK
456 shall be thusly marked. */
457
458 void
objc_mark_locals_volatile(void * enclosing_blk)459 objc_mark_locals_volatile (void *enclosing_blk)
460 {
461 cp_binding_level *scope;
462
463 for (scope = current_binding_level;
464 scope && scope != enclosing_blk;
465 scope = scope->level_chain)
466 {
467 tree decl;
468
469 for (decl = scope->names; decl; decl = TREE_CHAIN (decl))
470 objc_volatilize_decl (decl);
471
472 /* Do not climb up past the current function. */
473 if (scope->kind == sk_function_parms)
474 break;
475 }
476 }
477
478 /* True if B is the level for the condition of a constexpr if. */
479
480 static bool
level_for_constexpr_if(cp_binding_level * b)481 level_for_constexpr_if (cp_binding_level *b)
482 {
483 return (b->kind == sk_cond && b->this_entity
484 && TREE_CODE (b->this_entity) == IF_STMT
485 && IF_STMT_CONSTEXPR_P (b->this_entity));
486 }
487
488 /* Update data for defined and undefined labels when leaving a scope. */
489
490 int
poplevel_named_label_1(named_label_entry ** slot,cp_binding_level * bl)491 poplevel_named_label_1 (named_label_entry **slot, cp_binding_level *bl)
492 {
493 named_label_entry *ent = *slot;
494 cp_binding_level *obl = bl->level_chain;
495
496 if (ent->binding_level == bl)
497 {
498 tree decl;
499
500 /* ENT->NAMES_IN_SCOPE may contain a mixture of DECLs and
501 TREE_LISTs representing OVERLOADs, so be careful. */
502 for (decl = ent->names_in_scope; decl; decl = (DECL_P (decl)
503 ? DECL_CHAIN (decl)
504 : TREE_CHAIN (decl)))
505 if (decl_jump_unsafe (decl))
506 vec_safe_push (ent->bad_decls, decl);
507
508 ent->binding_level = obl;
509 ent->names_in_scope = obl->names;
510 switch (bl->kind)
511 {
512 case sk_try:
513 ent->in_try_scope = true;
514 break;
515 case sk_catch:
516 ent->in_catch_scope = true;
517 break;
518 case sk_omp:
519 ent->in_omp_scope = true;
520 break;
521 case sk_transaction:
522 ent->in_transaction_scope = true;
523 break;
524 case sk_block:
525 if (level_for_constexpr_if (bl->level_chain))
526 ent->in_constexpr_if = true;
527 break;
528 default:
529 break;
530 }
531 }
532 else if (ent->uses)
533 {
534 struct named_label_use_entry *use;
535
536 for (use = ent->uses; use ; use = use->next)
537 if (use->binding_level == bl)
538 {
539 use->binding_level = obl;
540 use->names_in_scope = obl->names;
541 if (bl->kind == sk_omp)
542 use->in_omp_scope = true;
543 }
544 }
545
546 return 1;
547 }
548
549 /* Saved errorcount to avoid -Wunused-but-set-{parameter,variable} warnings
550 when errors were reported, except for -Werror-unused-but-set-*. */
551 static int unused_but_set_errorcount;
552
553 /* Exit a binding level.
554 Pop the level off, and restore the state of the identifier-decl mappings
555 that were in effect when this level was entered.
556
557 If KEEP == 1, this level had explicit declarations, so
558 and create a "block" (a BLOCK node) for the level
559 to record its declarations and subblocks for symbol table output.
560
561 If FUNCTIONBODY is nonzero, this level is the body of a function,
562 so create a block as if KEEP were set and also clear out all
563 label names.
564
565 If REVERSE is nonzero, reverse the order of decls before putting
566 them into the BLOCK. */
567
568 tree
poplevel(int keep,int reverse,int functionbody)569 poplevel (int keep, int reverse, int functionbody)
570 {
571 tree link;
572 /* The chain of decls was accumulated in reverse order.
573 Put it into forward order, just for cleanliness. */
574 tree decls;
575 tree subblocks;
576 tree block;
577 tree decl;
578 scope_kind kind;
579
580 bool subtime = timevar_cond_start (TV_NAME_LOOKUP);
581 restart:
582
583 block = NULL_TREE;
584
585 gcc_assert (current_binding_level->kind != sk_class
586 && current_binding_level->kind != sk_namespace);
587
588 if (current_binding_level->kind == sk_cleanup)
589 functionbody = 0;
590 subblocks = functionbody >= 0 ? current_binding_level->blocks : 0;
591
592 gcc_assert (!vec_safe_length (current_binding_level->class_shadowed));
593
594 /* We used to use KEEP == 2 to indicate that the new block should go
595 at the beginning of the list of blocks at this binding level,
596 rather than the end. This hack is no longer used. */
597 gcc_assert (keep == 0 || keep == 1);
598
599 if (current_binding_level->keep)
600 keep = 1;
601
602 /* Any uses of undefined labels, and any defined labels, now operate
603 under constraints of next binding contour. */
604 if (cfun && !functionbody && named_labels)
605 named_labels->traverse<cp_binding_level *, poplevel_named_label_1>
606 (current_binding_level);
607
608 /* Get the decls in the order they were written.
609 Usually current_binding_level->names is in reverse order.
610 But parameter decls were previously put in forward order. */
611
612 decls = current_binding_level->names;
613 if (reverse)
614 {
615 decls = nreverse (decls);
616 current_binding_level->names = decls;
617 }
618
619 /* If there were any declarations or structure tags in that level,
620 or if this level is a function body,
621 create a BLOCK to record them for the life of this function. */
622 block = NULL_TREE;
623 /* Avoid function body block if possible. */
624 if (functionbody && subblocks && BLOCK_CHAIN (subblocks) == NULL_TREE)
625 keep = 0;
626 else if (keep == 1 || functionbody)
627 block = make_node (BLOCK);
628 if (block != NULL_TREE)
629 {
630 BLOCK_VARS (block) = decls;
631 BLOCK_SUBBLOCKS (block) = subblocks;
632 }
633
634 /* In each subblock, record that this is its superior. */
635 if (keep >= 0)
636 for (link = subblocks; link; link = BLOCK_CHAIN (link))
637 BLOCK_SUPERCONTEXT (link) = block;
638
639 /* Before we remove the declarations first check for unused variables. */
640 if ((warn_unused_variable || warn_unused_but_set_variable)
641 && current_binding_level->kind != sk_template_parms
642 && !processing_template_decl)
643 for (tree d = get_local_decls (); d; d = TREE_CHAIN (d))
644 {
645 /* There are cases where D itself is a TREE_LIST. See in
646 push_local_binding where the list of decls returned by
647 getdecls is built. */
648 decl = TREE_CODE (d) == TREE_LIST ? TREE_VALUE (d) : d;
649
650 tree type = TREE_TYPE (decl);
651 if (VAR_P (decl)
652 && (! TREE_USED (decl) || !DECL_READ_P (decl))
653 && ! DECL_IN_SYSTEM_HEADER (decl)
654 /* For structured bindings, consider only real variables, not
655 subobjects. */
656 && (DECL_DECOMPOSITION_P (decl) ? !DECL_DECOMP_BASE (decl)
657 : (DECL_NAME (decl) && !DECL_ARTIFICIAL (decl)))
658 && type != error_mark_node
659 && (!CLASS_TYPE_P (type)
660 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
661 || lookup_attribute ("warn_unused",
662 TYPE_ATTRIBUTES (TREE_TYPE (decl)))))
663 {
664 if (! TREE_USED (decl))
665 {
666 if (!DECL_NAME (decl) && DECL_DECOMPOSITION_P (decl))
667 warning_at (DECL_SOURCE_LOCATION (decl),
668 OPT_Wunused_variable,
669 "unused structured binding declaration");
670 else
671 warning_at (DECL_SOURCE_LOCATION (decl),
672 OPT_Wunused_variable, "unused variable %qD", decl);
673 }
674 else if (DECL_CONTEXT (decl) == current_function_decl
675 // For -Wunused-but-set-variable leave references alone.
676 && !TYPE_REF_P (TREE_TYPE (decl))
677 && errorcount == unused_but_set_errorcount)
678 {
679 if (!DECL_NAME (decl) && DECL_DECOMPOSITION_P (decl))
680 warning_at (DECL_SOURCE_LOCATION (decl),
681 OPT_Wunused_but_set_variable, "structured "
682 "binding declaration set but not used");
683 else
684 warning_at (DECL_SOURCE_LOCATION (decl),
685 OPT_Wunused_but_set_variable,
686 "variable %qD set but not used", decl);
687 unused_but_set_errorcount = errorcount;
688 }
689 }
690 }
691
692 /* Remove declarations for all the DECLs in this level. */
693 for (link = decls; link; link = TREE_CHAIN (link))
694 {
695 decl = TREE_CODE (link) == TREE_LIST ? TREE_VALUE (link) : link;
696 tree name = OVL_NAME (decl);
697
698 /* Remove the binding. */
699 if (TREE_CODE (decl) == LABEL_DECL)
700 pop_local_label (name, decl);
701 else
702 pop_local_binding (name, decl);
703 }
704
705 /* Restore the IDENTIFIER_TYPE_VALUEs. */
706 for (link = current_binding_level->type_shadowed;
707 link; link = TREE_CHAIN (link))
708 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (link), TREE_VALUE (link));
709
710 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
711 list if a `using' declaration put them there. The debugging
712 back ends won't understand OVERLOAD, so we remove them here.
713 Because the BLOCK_VARS are (temporarily) shared with
714 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
715 popped all the bindings. Also remove undeduced 'auto' decls,
716 which LTO doesn't understand, and can't have been used by anything. */
717 if (block)
718 {
719 tree* d;
720
721 for (d = &BLOCK_VARS (block); *d; )
722 {
723 if (TREE_CODE (*d) == TREE_LIST
724 || (!processing_template_decl
725 && undeduced_auto_decl (*d)))
726 *d = TREE_CHAIN (*d);
727 else
728 d = &DECL_CHAIN (*d);
729 }
730 }
731
732 /* If the level being exited is the top level of a function,
733 check over all the labels. */
734 if (functionbody)
735 {
736 if (block)
737 {
738 /* Since this is the top level block of a function, the vars are
739 the function's parameters. Don't leave them in the BLOCK
740 because they are found in the FUNCTION_DECL instead. */
741 BLOCK_VARS (block) = 0;
742 pop_labels (block);
743 }
744 else
745 pop_labels (subblocks);
746 }
747
748 kind = current_binding_level->kind;
749 if (kind == sk_cleanup)
750 {
751 tree stmt;
752
753 /* If this is a temporary binding created for a cleanup, then we'll
754 have pushed a statement list level. Pop that, create a new
755 BIND_EXPR for the block, and insert it into the stream. */
756 stmt = pop_stmt_list (current_binding_level->statement_list);
757 stmt = c_build_bind_expr (input_location, block, stmt);
758 add_stmt (stmt);
759 }
760
761 leave_scope ();
762 if (functionbody)
763 {
764 /* The current function is being defined, so its DECL_INITIAL
765 should be error_mark_node. */
766 gcc_assert (DECL_INITIAL (current_function_decl) == error_mark_node);
767 DECL_INITIAL (current_function_decl) = block ? block : subblocks;
768 if (subblocks)
769 {
770 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
771 {
772 if (BLOCK_SUBBLOCKS (subblocks))
773 BLOCK_OUTER_CURLY_BRACE_P (BLOCK_SUBBLOCKS (subblocks)) = 1;
774 }
775 else
776 BLOCK_OUTER_CURLY_BRACE_P (subblocks) = 1;
777 }
778 }
779 else if (block)
780 current_binding_level->blocks
781 = block_chainon (current_binding_level->blocks, block);
782
783 /* If we did not make a block for the level just exited,
784 any blocks made for inner levels
785 (since they cannot be recorded as subblocks in that level)
786 must be carried forward so they will later become subblocks
787 of something else. */
788 else if (subblocks)
789 current_binding_level->blocks
790 = block_chainon (current_binding_level->blocks, subblocks);
791
792 /* Each and every BLOCK node created here in `poplevel' is important
793 (e.g. for proper debugging information) so if we created one
794 earlier, mark it as "used". */
795 if (block)
796 TREE_USED (block) = 1;
797
798 /* All temporary bindings created for cleanups are popped silently. */
799 if (kind == sk_cleanup)
800 goto restart;
801
802 timevar_cond_stop (TV_NAME_LOOKUP, subtime);
803 return block;
804 }
805
806 /* Call wrapup_globals_declarations for the globals in NAMESPACE. */
807 /* Diagnose odr-used extern inline variables without definitions
808 in the current TU. */
809
810 int
wrapup_namespace_globals()811 wrapup_namespace_globals ()
812 {
813 if (vec<tree, va_gc> *statics = static_decls)
814 {
815 tree decl;
816 unsigned int i;
817 FOR_EACH_VEC_ELT (*statics, i, decl)
818 {
819 if (warn_unused_function
820 && TREE_CODE (decl) == FUNCTION_DECL
821 && DECL_INITIAL (decl) == 0
822 && DECL_EXTERNAL (decl)
823 && !TREE_PUBLIC (decl)
824 && !DECL_ARTIFICIAL (decl)
825 && !DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)
826 && !TREE_NO_WARNING (decl))
827 warning_at (DECL_SOURCE_LOCATION (decl),
828 OPT_Wunused_function,
829 "%qF declared %<static%> but never defined", decl);
830
831 if (VAR_P (decl)
832 && DECL_EXTERNAL (decl)
833 && DECL_INLINE_VAR_P (decl)
834 && DECL_ODR_USED (decl))
835 error_at (DECL_SOURCE_LOCATION (decl),
836 "odr-used inline variable %qD is not defined", decl);
837 }
838
839 /* Clear out the list, so we don't rescan next time. */
840 static_decls = NULL;
841
842 /* Write out any globals that need to be output. */
843 return wrapup_global_declarations (statics->address (),
844 statics->length ());
845 }
846 return 0;
847 }
848
849 /* In C++, you don't have to write `struct S' to refer to `S'; you
850 can just use `S'. We accomplish this by creating a TYPE_DECL as
851 if the user had written `typedef struct S S'. Create and return
852 the TYPE_DECL for TYPE. */
853
854 tree
create_implicit_typedef(tree name,tree type)855 create_implicit_typedef (tree name, tree type)
856 {
857 tree decl;
858
859 decl = build_decl (input_location, TYPE_DECL, name, type);
860 DECL_ARTIFICIAL (decl) = 1;
861 /* There are other implicit type declarations, like the one *within*
862 a class that allows you to write `S::S'. We must distinguish
863 amongst these. */
864 SET_DECL_IMPLICIT_TYPEDEF_P (decl);
865 TYPE_NAME (type) = decl;
866 TYPE_STUB_DECL (type) = decl;
867
868 return decl;
869 }
870
871 /* Function-scope local entities that need discriminators. Each entry
872 is a {decl,name} pair. VAR_DECLs for anon unions get their name
873 smashed, so we cannot rely on DECL_NAME. */
874
875 static GTY((deletable)) vec<tree, va_gc> *local_entities;
876
877 /* Determine the mangling discriminator of local DECL. There are
878 generally very few of these in any particular function. */
879
880 void
determine_local_discriminator(tree decl)881 determine_local_discriminator (tree decl)
882 {
883 bool subtime = timevar_cond_start (TV_NAME_LOOKUP);
884 retrofit_lang_decl (decl);
885 tree ctx = DECL_CONTEXT (decl);
886 tree name = (TREE_CODE (decl) == TYPE_DECL
887 && TYPE_UNNAMED_P (TREE_TYPE (decl))
888 ? NULL_TREE : DECL_NAME (decl));
889 size_t nelts = vec_safe_length (local_entities);
890 for (size_t i = 0; i < nelts; i += 2)
891 {
892 tree *pair = &(*local_entities)[i];
893 tree d = pair[0];
894 tree n = pair[1];
895 gcc_checking_assert (d != decl);
896 if (name == n
897 && TREE_CODE (decl) == TREE_CODE (d)
898 && ctx == DECL_CONTEXT (d))
899 {
900 tree disc = integer_one_node;
901 if (DECL_DISCRIMINATOR (d))
902 disc = build_int_cst (TREE_TYPE (disc),
903 TREE_INT_CST_LOW (DECL_DISCRIMINATOR (d)) + 1);
904 DECL_DISCRIMINATOR (decl) = disc;
905 /* Replace the saved decl. */
906 pair[0] = decl;
907 decl = NULL_TREE;
908 break;
909 }
910 }
911
912 if (decl)
913 {
914 vec_safe_reserve (local_entities, 2);
915 local_entities->quick_push (decl);
916 local_entities->quick_push (name);
917 }
918
919 timevar_cond_stop (TV_NAME_LOOKUP, subtime);
920 }
921
922
923
924 /* Returns true if functions FN1 and FN2 have equivalent trailing
925 requires clauses. */
926
927 static bool
function_requirements_equivalent_p(tree newfn,tree oldfn)928 function_requirements_equivalent_p (tree newfn, tree oldfn)
929 {
930 /* In the concepts TS, the combined constraints are compared. */
931 if (cxx_dialect < cxx2a)
932 {
933 tree ci1 = get_constraints (oldfn);
934 tree ci2 = get_constraints (newfn);
935 tree req1 = ci1 ? CI_ASSOCIATED_CONSTRAINTS (ci1) : NULL_TREE;
936 tree req2 = ci2 ? CI_ASSOCIATED_CONSTRAINTS (ci2) : NULL_TREE;
937 return cp_tree_equal (req1, req2);
938 }
939
940 /* Compare only trailing requirements. */
941 tree reqs1 = get_trailing_function_requirements (newfn);
942 tree reqs2 = get_trailing_function_requirements (oldfn);
943 if ((reqs1 != NULL_TREE) != (reqs2 != NULL_TREE))
944 return false;
945 reqs1 = maybe_substitute_reqs_for (reqs1, newfn);
946 reqs2 = maybe_substitute_reqs_for (reqs2, oldfn);
947 return cp_tree_equal (reqs1, reqs2);
948 }
949
950 /* Subroutine of duplicate_decls: return truthvalue of whether
951 or not types of these decls match.
952
953 For C++, we must compare the parameter list so that `int' can match
954 `int&' in a parameter position, but `int&' is not confused with
955 `const int&'. */
956
957 int
decls_match(tree newdecl,tree olddecl,bool record_versions)958 decls_match (tree newdecl, tree olddecl, bool record_versions /* = true */)
959 {
960 int types_match;
961
962 if (newdecl == olddecl)
963 return 1;
964
965 if (TREE_CODE (newdecl) != TREE_CODE (olddecl))
966 /* If the two DECLs are not even the same kind of thing, we're not
967 interested in their types. */
968 return 0;
969
970 gcc_assert (DECL_P (newdecl));
971
972 if (TREE_CODE (newdecl) == FUNCTION_DECL)
973 {
974 tree f1 = TREE_TYPE (newdecl);
975 tree f2 = TREE_TYPE (olddecl);
976 tree p1 = TYPE_ARG_TYPES (f1);
977 tree p2 = TYPE_ARG_TYPES (f2);
978 tree r2;
979
980 /* Specializations of different templates are different functions
981 even if they have the same type. */
982 tree t1 = (DECL_USE_TEMPLATE (newdecl)
983 ? DECL_TI_TEMPLATE (newdecl)
984 : NULL_TREE);
985 tree t2 = (DECL_USE_TEMPLATE (olddecl)
986 ? DECL_TI_TEMPLATE (olddecl)
987 : NULL_TREE);
988 if (t1 != t2)
989 return 0;
990
991 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
992 && ! (DECL_EXTERN_C_P (newdecl)
993 && DECL_EXTERN_C_P (olddecl)))
994 return 0;
995
996 /* A new declaration doesn't match a built-in one unless it
997 is also extern "C". */
998 if (DECL_IS_BUILTIN (olddecl)
999 && DECL_EXTERN_C_P (olddecl) && !DECL_EXTERN_C_P (newdecl))
1000 return 0;
1001
1002 if (TREE_CODE (f1) != TREE_CODE (f2))
1003 return 0;
1004
1005 /* A declaration with deduced return type should use its pre-deduction
1006 type for declaration matching. */
1007 r2 = fndecl_declared_return_type (olddecl);
1008
1009 if (same_type_p (TREE_TYPE (f1), r2))
1010 {
1011 if (!prototype_p (f2) && DECL_EXTERN_C_P (olddecl)
1012 && fndecl_built_in_p (olddecl))
1013 {
1014 types_match = self_promoting_args_p (p1);
1015 if (p1 == void_list_node)
1016 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
1017 }
1018 else
1019 types_match =
1020 compparms (p1, p2)
1021 && type_memfn_rqual (f1) == type_memfn_rqual (f2)
1022 && (TYPE_ATTRIBUTES (TREE_TYPE (newdecl)) == NULL_TREE
1023 || comp_type_attributes (TREE_TYPE (newdecl),
1024 TREE_TYPE (olddecl)) != 0);
1025 }
1026 else
1027 types_match = 0;
1028
1029 /* Two function declarations match if either has a requires-clause
1030 then both have a requires-clause and their constraints-expressions
1031 are equivalent. */
1032 if (types_match && flag_concepts)
1033 types_match = function_requirements_equivalent_p (newdecl, olddecl);
1034
1035 /* The decls dont match if they correspond to two different versions
1036 of the same function. Disallow extern "C" functions to be
1037 versions for now. */
1038 if (types_match
1039 && !DECL_EXTERN_C_P (newdecl)
1040 && !DECL_EXTERN_C_P (olddecl)
1041 && record_versions
1042 && maybe_version_functions (newdecl, olddecl,
1043 (!DECL_FUNCTION_VERSIONED (newdecl)
1044 || !DECL_FUNCTION_VERSIONED (olddecl))))
1045 return 0;
1046 }
1047 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1048 {
1049 if (!template_heads_equivalent_p (newdecl, olddecl))
1050 return 0;
1051
1052 tree oldres = DECL_TEMPLATE_RESULT (olddecl);
1053 tree newres = DECL_TEMPLATE_RESULT (newdecl);
1054
1055 if (TREE_CODE (newres) != TREE_CODE (oldres))
1056 return 0;
1057
1058 /* Two template types match if they are the same. Otherwise, compare
1059 the underlying declarations. */
1060 if (TREE_CODE (newres) == TYPE_DECL)
1061 types_match = same_type_p (TREE_TYPE (newres), TREE_TYPE (oldres));
1062 else
1063 types_match = decls_match (newres, oldres);
1064 }
1065 else
1066 {
1067 /* Need to check scope for variable declaration (VAR_DECL).
1068 For typedef (TYPE_DECL), scope is ignored. */
1069 if (VAR_P (newdecl)
1070 && CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
1071 /* [dcl.link]
1072 Two declarations for an object with C language linkage
1073 with the same name (ignoring the namespace that qualify
1074 it) that appear in different namespace scopes refer to
1075 the same object. */
1076 && !(DECL_EXTERN_C_P (olddecl) && DECL_EXTERN_C_P (newdecl)))
1077 return 0;
1078
1079 if (TREE_TYPE (newdecl) == error_mark_node)
1080 types_match = TREE_TYPE (olddecl) == error_mark_node;
1081 else if (TREE_TYPE (olddecl) == NULL_TREE)
1082 types_match = TREE_TYPE (newdecl) == NULL_TREE;
1083 else if (TREE_TYPE (newdecl) == NULL_TREE)
1084 types_match = 0;
1085 else
1086 types_match = comptypes (TREE_TYPE (newdecl),
1087 TREE_TYPE (olddecl),
1088 COMPARE_REDECLARATION);
1089 }
1090
1091 return types_match;
1092 }
1093
1094 /* NEWDECL and OLDDECL have identical signatures. If they are
1095 different versions adjust them and return true.
1096 If RECORD is set to true, record function versions. */
1097
1098 bool
maybe_version_functions(tree newdecl,tree olddecl,bool record)1099 maybe_version_functions (tree newdecl, tree olddecl, bool record)
1100 {
1101 if (!targetm.target_option.function_versions (newdecl, olddecl))
1102 return false;
1103
1104 if (!DECL_FUNCTION_VERSIONED (olddecl))
1105 {
1106 DECL_FUNCTION_VERSIONED (olddecl) = 1;
1107 if (DECL_ASSEMBLER_NAME_SET_P (olddecl))
1108 mangle_decl (olddecl);
1109 }
1110
1111 if (!DECL_FUNCTION_VERSIONED (newdecl))
1112 {
1113 DECL_FUNCTION_VERSIONED (newdecl) = 1;
1114 if (DECL_ASSEMBLER_NAME_SET_P (newdecl))
1115 mangle_decl (newdecl);
1116 }
1117
1118 if (record)
1119 cgraph_node::record_function_versions (olddecl, newdecl);
1120
1121 return true;
1122 }
1123
1124 /* If NEWDECL is `static' and an `extern' was seen previously,
1125 warn about it. OLDDECL is the previous declaration.
1126
1127 Note that this does not apply to the C++ case of declaring
1128 a variable `extern const' and then later `const'.
1129
1130 Don't complain about built-in functions, since they are beyond
1131 the user's control. */
1132
1133 void
warn_extern_redeclared_static(tree newdecl,tree olddecl)1134 warn_extern_redeclared_static (tree newdecl, tree olddecl)
1135 {
1136 if (TREE_CODE (newdecl) == TYPE_DECL
1137 || TREE_CODE (newdecl) == TEMPLATE_DECL
1138 || TREE_CODE (newdecl) == CONST_DECL
1139 || TREE_CODE (newdecl) == NAMESPACE_DECL)
1140 return;
1141
1142 /* Don't get confused by static member functions; that's a different
1143 use of `static'. */
1144 if (TREE_CODE (newdecl) == FUNCTION_DECL
1145 && DECL_STATIC_FUNCTION_P (newdecl))
1146 return;
1147
1148 /* If the old declaration was `static', or the new one isn't, then
1149 everything is OK. */
1150 if (DECL_THIS_STATIC (olddecl) || !DECL_THIS_STATIC (newdecl))
1151 return;
1152
1153 /* It's OK to declare a builtin function as `static'. */
1154 if (TREE_CODE (olddecl) == FUNCTION_DECL
1155 && DECL_ARTIFICIAL (olddecl))
1156 return;
1157
1158 auto_diagnostic_group d;
1159 if (permerror (DECL_SOURCE_LOCATION (newdecl),
1160 "%qD was declared %<extern%> and later %<static%>", newdecl))
1161 inform (DECL_SOURCE_LOCATION (olddecl),
1162 "previous declaration of %qD", olddecl);
1163 }
1164
1165 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1166 function templates. If their exception specifications do not
1167 match, issue a diagnostic. */
1168
1169 static void
check_redeclaration_exception_specification(tree new_decl,tree old_decl)1170 check_redeclaration_exception_specification (tree new_decl,
1171 tree old_decl)
1172 {
1173 tree new_exceptions = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (new_decl));
1174 tree old_exceptions = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (old_decl));
1175
1176 /* Two default specs are equivalent, don't force evaluation. */
1177 if (UNEVALUATED_NOEXCEPT_SPEC_P (new_exceptions)
1178 && UNEVALUATED_NOEXCEPT_SPEC_P (old_exceptions))
1179 return;
1180
1181 if (!type_dependent_expression_p (old_decl))
1182 {
1183 maybe_instantiate_noexcept (new_decl);
1184 maybe_instantiate_noexcept (old_decl);
1185 }
1186 new_exceptions = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (new_decl));
1187 old_exceptions = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (old_decl));
1188
1189 /* [except.spec]
1190
1191 If any declaration of a function has an exception-specification,
1192 all declarations, including the definition and an explicit
1193 specialization, of that function shall have an
1194 exception-specification with the same set of type-ids. */
1195 if (! DECL_IS_BUILTIN (old_decl)
1196 && !comp_except_specs (new_exceptions, old_exceptions, ce_normal))
1197 {
1198 const char *const msg
1199 = G_("declaration of %qF has a different exception specifier");
1200 bool complained = true;
1201 location_t new_loc = DECL_SOURCE_LOCATION (new_decl);
1202 auto_diagnostic_group d;
1203 if (DECL_IN_SYSTEM_HEADER (old_decl))
1204 complained = pedwarn (new_loc, OPT_Wsystem_headers, msg, new_decl);
1205 else if (!flag_exceptions)
1206 /* We used to silently permit mismatched eh specs with
1207 -fno-exceptions, so make them a pedwarn now. */
1208 complained = pedwarn (new_loc, OPT_Wpedantic, msg, new_decl);
1209 else
1210 error_at (new_loc, msg, new_decl);
1211 if (complained)
1212 inform (DECL_SOURCE_LOCATION (old_decl),
1213 "from previous declaration %qF", old_decl);
1214 }
1215 }
1216
1217 /* Return true if OLD_DECL and NEW_DECL agree on constexprness.
1218 Otherwise issue diagnostics. */
1219
1220 static bool
validate_constexpr_redeclaration(tree old_decl,tree new_decl)1221 validate_constexpr_redeclaration (tree old_decl, tree new_decl)
1222 {
1223 old_decl = STRIP_TEMPLATE (old_decl);
1224 new_decl = STRIP_TEMPLATE (new_decl);
1225 if (!VAR_OR_FUNCTION_DECL_P (old_decl)
1226 || !VAR_OR_FUNCTION_DECL_P (new_decl))
1227 return true;
1228 if (DECL_DECLARED_CONSTEXPR_P (old_decl)
1229 == DECL_DECLARED_CONSTEXPR_P (new_decl))
1230 {
1231 if (TREE_CODE (old_decl) != FUNCTION_DECL)
1232 return true;
1233 if (DECL_IMMEDIATE_FUNCTION_P (old_decl)
1234 == DECL_IMMEDIATE_FUNCTION_P (new_decl))
1235 return true;
1236 }
1237 if (TREE_CODE (old_decl) == FUNCTION_DECL)
1238 {
1239 if (fndecl_built_in_p (old_decl))
1240 {
1241 /* Hide a built-in declaration. */
1242 DECL_DECLARED_CONSTEXPR_P (old_decl)
1243 = DECL_DECLARED_CONSTEXPR_P (new_decl);
1244 if (DECL_IMMEDIATE_FUNCTION_P (new_decl))
1245 SET_DECL_IMMEDIATE_FUNCTION_P (old_decl);
1246 return true;
1247 }
1248 /* 7.1.5 [dcl.constexpr]
1249 Note: An explicit specialization can differ from the template
1250 declaration with respect to the constexpr specifier. */
1251 if (! DECL_TEMPLATE_SPECIALIZATION (old_decl)
1252 && DECL_TEMPLATE_SPECIALIZATION (new_decl))
1253 return true;
1254
1255 const char *kind = "constexpr";
1256 if (DECL_IMMEDIATE_FUNCTION_P (old_decl)
1257 || DECL_IMMEDIATE_FUNCTION_P (new_decl))
1258 kind = "consteval";
1259 error_at (DECL_SOURCE_LOCATION (new_decl),
1260 "redeclaration %qD differs in %qs "
1261 "from previous declaration", new_decl,
1262 kind);
1263 inform (DECL_SOURCE_LOCATION (old_decl),
1264 "previous declaration %qD", old_decl);
1265 return false;
1266 }
1267 return true;
1268 }
1269
1270 // If OLDDECL and NEWDECL are concept declarations with the same type
1271 // (i.e., and template parameters), but different requirements,
1272 // emit diagnostics and return true. Otherwise, return false.
1273 static inline bool
check_concept_refinement(tree olddecl,tree newdecl)1274 check_concept_refinement (tree olddecl, tree newdecl)
1275 {
1276 if (!DECL_DECLARED_CONCEPT_P (olddecl) || !DECL_DECLARED_CONCEPT_P (newdecl))
1277 return false;
1278
1279 tree d1 = DECL_TEMPLATE_RESULT (olddecl);
1280 tree d2 = DECL_TEMPLATE_RESULT (newdecl);
1281 if (TREE_CODE (d1) != TREE_CODE (d2))
1282 return false;
1283
1284 tree t1 = TREE_TYPE (d1);
1285 tree t2 = TREE_TYPE (d2);
1286 if (TREE_CODE (d1) == FUNCTION_DECL)
1287 {
1288 if (compparms (TYPE_ARG_TYPES (t1), TYPE_ARG_TYPES (t2))
1289 && comp_template_parms (DECL_TEMPLATE_PARMS (olddecl),
1290 DECL_TEMPLATE_PARMS (newdecl))
1291 && !equivalently_constrained (olddecl, newdecl))
1292 {
1293 error ("cannot specialize concept %q#D", olddecl);
1294 return true;
1295 }
1296 }
1297 return false;
1298 }
1299
1300 /* DECL is a redeclaration of a function or function template. If
1301 it does have default arguments issue a diagnostic. Note: this
1302 function is used to enforce the requirements in C++11 8.3.6 about
1303 no default arguments in redeclarations. */
1304
1305 static void
check_redeclaration_no_default_args(tree decl)1306 check_redeclaration_no_default_args (tree decl)
1307 {
1308 gcc_assert (DECL_DECLARES_FUNCTION_P (decl));
1309
1310 for (tree t = FUNCTION_FIRST_USER_PARMTYPE (decl);
1311 t && t != void_list_node; t = TREE_CHAIN (t))
1312 if (TREE_PURPOSE (t))
1313 {
1314 permerror (DECL_SOURCE_LOCATION (decl),
1315 "redeclaration of %q#D may not have default "
1316 "arguments", decl);
1317 return;
1318 }
1319 }
1320
1321 /* NEWDECL is a redeclaration of a function or function template OLDDECL,
1322 in any case represented as FUNCTION_DECLs (the DECL_TEMPLATE_RESULTs of
1323 the TEMPLATE_DECLs in case of function templates). This function is used
1324 to enforce the final part of C++17 11.3.6/4, about a single declaration:
1325 "If a friend declaration specifies a default argument expression, that
1326 declaration shall be a definition and shall be the only declaration of
1327 the function or function template in the translation unit." */
1328
1329 static void
check_no_redeclaration_friend_default_args(tree olddecl,tree newdecl,bool olddecl_hidden_friend_p)1330 check_no_redeclaration_friend_default_args (tree olddecl, tree newdecl,
1331 bool olddecl_hidden_friend_p)
1332 {
1333 if (!olddecl_hidden_friend_p && !DECL_FRIEND_P (newdecl))
1334 return;
1335
1336 tree t1 = FUNCTION_FIRST_USER_PARMTYPE (olddecl);
1337 tree t2 = FUNCTION_FIRST_USER_PARMTYPE (newdecl);
1338
1339 for (; t1 && t1 != void_list_node;
1340 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1341 if ((olddecl_hidden_friend_p && TREE_PURPOSE (t1))
1342 || (DECL_FRIEND_P (newdecl) && TREE_PURPOSE (t2)))
1343 {
1344 auto_diagnostic_group d;
1345 if (permerror (DECL_SOURCE_LOCATION (newdecl),
1346 "friend declaration of %q#D specifies default "
1347 "arguments and isn%'t the only declaration", newdecl))
1348 inform (DECL_SOURCE_LOCATION (olddecl),
1349 "previous declaration of %q#D", olddecl);
1350 return;
1351 }
1352 }
1353
1354 /* Merge tree bits that correspond to attributes noreturn, nothrow,
1355 const, malloc, and pure from NEWDECL with those of OLDDECL. */
1356
1357 static void
merge_attribute_bits(tree newdecl,tree olddecl)1358 merge_attribute_bits (tree newdecl, tree olddecl)
1359 {
1360 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1361 TREE_THIS_VOLATILE (olddecl) |= TREE_THIS_VOLATILE (newdecl);
1362 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
1363 TREE_NOTHROW (olddecl) |= TREE_NOTHROW (newdecl);
1364 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1365 TREE_READONLY (olddecl) |= TREE_READONLY (newdecl);
1366 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1367 DECL_IS_MALLOC (olddecl) |= DECL_IS_MALLOC (newdecl);
1368 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
1369 DECL_PURE_P (olddecl) |= DECL_PURE_P (newdecl);
1370 DECL_UNINLINABLE (newdecl) |= DECL_UNINLINABLE (olddecl);
1371 DECL_UNINLINABLE (olddecl) |= DECL_UNINLINABLE (newdecl);
1372 }
1373
1374 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1375 && lookup_attribute ("gnu_inline", \
1376 DECL_ATTRIBUTES (fn)))
1377
1378 /* A subroutine of duplicate_decls. Emits a diagnostic when newdecl
1379 ambiguates olddecl. Returns true if an error occurs. */
1380
1381 static bool
duplicate_function_template_decls(tree newdecl,tree olddecl)1382 duplicate_function_template_decls (tree newdecl, tree olddecl)
1383 {
1384
1385 tree newres = DECL_TEMPLATE_RESULT (newdecl);
1386 tree oldres = DECL_TEMPLATE_RESULT (olddecl);
1387 /* Function template declarations can be differentiated by parameter
1388 and return type. */
1389 if (compparms (TYPE_ARG_TYPES (TREE_TYPE (oldres)),
1390 TYPE_ARG_TYPES (TREE_TYPE (newres)))
1391 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl)),
1392 TREE_TYPE (TREE_TYPE (olddecl))))
1393 {
1394 /* ... and also by their template-heads and requires-clauses. */
1395 if (template_heads_equivalent_p (newdecl, olddecl)
1396 && function_requirements_equivalent_p (newres, oldres))
1397 {
1398 error ("ambiguating new declaration %q+#D", newdecl);
1399 inform (DECL_SOURCE_LOCATION (olddecl),
1400 "old declaration %q#D", olddecl);
1401 return true;
1402 }
1403
1404 /* FIXME: The types are the same but the are differences
1405 in either the template heads or function requirements.
1406 We should be able to diagnose a set of common errors
1407 stemming from these declarations. For example:
1408
1409 template<typename T> requires C void f(...);
1410 template<typename T> void f(...) requires C;
1411
1412 These are functionally equivalent but not equivalent. */
1413 }
1414
1415 return false;
1416 }
1417
1418 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1419 If the redeclaration is invalid, a diagnostic is issued, and the
1420 error_mark_node is returned. Otherwise, OLDDECL is returned.
1421
1422 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1423 returned.
1424
1425 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1426
1427 tree
duplicate_decls(tree newdecl,tree olddecl,bool newdecl_is_friend)1428 duplicate_decls (tree newdecl, tree olddecl, bool newdecl_is_friend)
1429 {
1430 unsigned olddecl_uid = DECL_UID (olddecl);
1431 int olddecl_friend = 0, types_match = 0, hidden_friend = 0;
1432 int olddecl_hidden_friend = 0;
1433 int new_defines_function = 0;
1434 tree new_template_info;
1435 location_t olddecl_loc = DECL_SOURCE_LOCATION (olddecl);
1436 location_t newdecl_loc = DECL_SOURCE_LOCATION (newdecl);
1437
1438 if (newdecl == olddecl)
1439 return olddecl;
1440
1441 types_match = decls_match (newdecl, olddecl);
1442
1443 /* If either the type of the new decl or the type of the old decl is an
1444 error_mark_node, then that implies that we have already issued an
1445 error (earlier) for some bogus type specification, and in that case,
1446 it is rather pointless to harass the user with yet more error message
1447 about the same declaration, so just pretend the types match here. */
1448 if (TREE_TYPE (newdecl) == error_mark_node
1449 || TREE_TYPE (olddecl) == error_mark_node)
1450 return error_mark_node;
1451
1452 /* Check for redeclaration and other discrepancies. */
1453 if (TREE_CODE (olddecl) == FUNCTION_DECL
1454 && DECL_ARTIFICIAL (olddecl)
1455 /* A C++20 implicit friend operator== uses the normal path (94462). */
1456 && !DECL_HIDDEN_FRIEND_P (olddecl))
1457 {
1458 if (TREE_CODE (newdecl) != FUNCTION_DECL)
1459 {
1460 /* Avoid warnings redeclaring built-ins which have not been
1461 explicitly declared. */
1462 if (DECL_ANTICIPATED (olddecl))
1463 {
1464 if (TREE_PUBLIC (newdecl)
1465 && CP_DECL_CONTEXT (newdecl) == global_namespace)
1466 warning_at (newdecl_loc,
1467 OPT_Wbuiltin_declaration_mismatch,
1468 "built-in function %qD declared as non-function",
1469 newdecl);
1470 return NULL_TREE;
1471 }
1472
1473 /* If you declare a built-in or predefined function name as static,
1474 the old definition is overridden, but optionally warn this was a
1475 bad choice of name. */
1476 if (! TREE_PUBLIC (newdecl))
1477 {
1478 warning_at (newdecl_loc,
1479 OPT_Wshadow,
1480 fndecl_built_in_p (olddecl)
1481 ? G_("shadowing built-in function %q#D")
1482 : G_("shadowing library function %q#D"), olddecl);
1483 /* Discard the old built-in function. */
1484 return NULL_TREE;
1485 }
1486 /* If the built-in is not ansi, then programs can override
1487 it even globally without an error. */
1488 else if (! fndecl_built_in_p (olddecl))
1489 warning_at (newdecl_loc, 0,
1490 "library function %q#D redeclared as non-function %q#D",
1491 olddecl, newdecl);
1492 else
1493 error_at (newdecl_loc,
1494 "declaration of %q#D conflicts with built-in "
1495 "declaration %q#D", newdecl, olddecl);
1496 return NULL_TREE;
1497 }
1498 else if (DECL_OMP_DECLARE_REDUCTION_P (olddecl))
1499 {
1500 gcc_assert (DECL_OMP_DECLARE_REDUCTION_P (newdecl));
1501 error_at (newdecl_loc,
1502 "redeclaration of %<pragma omp declare reduction%>");
1503 inform (olddecl_loc,
1504 "previous %<pragma omp declare reduction%> declaration");
1505 return error_mark_node;
1506 }
1507 else if (!types_match)
1508 {
1509 /* Avoid warnings redeclaring built-ins which have not been
1510 explicitly declared. */
1511 if (DECL_ANTICIPATED (olddecl))
1512 {
1513 tree t1, t2;
1514
1515 /* A new declaration doesn't match a built-in one unless it
1516 is also extern "C". */
1517 gcc_assert (DECL_IS_BUILTIN (olddecl));
1518 gcc_assert (DECL_EXTERN_C_P (olddecl));
1519 if (!DECL_EXTERN_C_P (newdecl))
1520 return NULL_TREE;
1521
1522 for (t1 = TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1523 t2 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1524 t1 || t2;
1525 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1526 {
1527 if (!t1 || !t2)
1528 break;
1529 /* FILE, tm types are not known at the time
1530 we create the builtins. */
1531 for (unsigned i = 0;
1532 i < sizeof (builtin_structptr_types)
1533 / sizeof (builtin_structptr_type);
1534 ++i)
1535 if (TREE_VALUE (t2) == builtin_structptr_types[i].node)
1536 {
1537 tree t = TREE_VALUE (t1);
1538
1539 if (TYPE_PTR_P (t)
1540 && TYPE_IDENTIFIER (TREE_TYPE (t))
1541 == get_identifier (builtin_structptr_types[i].str)
1542 && compparms (TREE_CHAIN (t1), TREE_CHAIN (t2)))
1543 {
1544 tree oldargs = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1545
1546 TYPE_ARG_TYPES (TREE_TYPE (olddecl))
1547 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1548 types_match = decls_match (newdecl, olddecl);
1549 if (types_match)
1550 return duplicate_decls (newdecl, olddecl,
1551 newdecl_is_friend);
1552 TYPE_ARG_TYPES (TREE_TYPE (olddecl)) = oldargs;
1553 }
1554 goto next_arg;
1555 }
1556
1557 if (! same_type_p (TREE_VALUE (t1), TREE_VALUE (t2)))
1558 break;
1559 next_arg:;
1560 }
1561
1562 warning_at (newdecl_loc,
1563 OPT_Wbuiltin_declaration_mismatch,
1564 "declaration of %q#D conflicts with built-in "
1565 "declaration %q#D", newdecl, olddecl);
1566 }
1567 else if ((DECL_EXTERN_C_P (newdecl)
1568 && DECL_EXTERN_C_P (olddecl))
1569 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1570 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1571 {
1572 /* Don't really override olddecl for __* prefixed builtins
1573 except for __[^b]*_chk, the compiler might be using those
1574 explicitly. */
1575 if (fndecl_built_in_p (olddecl))
1576 {
1577 tree id = DECL_NAME (olddecl);
1578 const char *name = IDENTIFIER_POINTER (id);
1579 size_t len;
1580
1581 if (name[0] == '_'
1582 && name[1] == '_'
1583 && (strncmp (name + 2, "builtin_",
1584 strlen ("builtin_")) == 0
1585 || (len = strlen (name)) <= strlen ("___chk")
1586 || memcmp (name + len - strlen ("_chk"),
1587 "_chk", strlen ("_chk") + 1) != 0))
1588 {
1589 if (DECL_INITIAL (newdecl))
1590 {
1591 error_at (newdecl_loc,
1592 "definition of %q#D ambiguates built-in "
1593 "declaration %q#D", newdecl, olddecl);
1594 return error_mark_node;
1595 }
1596 auto_diagnostic_group d;
1597 if (permerror (newdecl_loc,
1598 "new declaration %q#D ambiguates built-in"
1599 " declaration %q#D", newdecl, olddecl)
1600 && flag_permissive)
1601 inform (newdecl_loc,
1602 "ignoring the %q#D declaration", newdecl);
1603 return flag_permissive ? olddecl : error_mark_node;
1604 }
1605 }
1606
1607 /* A near match; override the builtin. */
1608
1609 if (TREE_PUBLIC (newdecl))
1610 warning_at (newdecl_loc,
1611 OPT_Wbuiltin_declaration_mismatch,
1612 "new declaration %q#D ambiguates built-in "
1613 "declaration %q#D", newdecl, olddecl);
1614 else
1615 warning (OPT_Wshadow,
1616 fndecl_built_in_p (olddecl)
1617 ? G_("shadowing built-in function %q#D")
1618 : G_("shadowing library function %q#D"), olddecl);
1619 }
1620 else
1621 /* Discard the old built-in function. */
1622 return NULL_TREE;
1623
1624 /* Replace the old RTL to avoid problems with inlining. */
1625 COPY_DECL_RTL (newdecl, olddecl);
1626 }
1627 /* Even if the types match, prefer the new declarations type for
1628 built-ins which have not been explicitly declared, for
1629 exception lists, etc... */
1630 else if (DECL_IS_BUILTIN (olddecl))
1631 {
1632 tree type = TREE_TYPE (newdecl);
1633 tree attribs = (*targetm.merge_type_attributes)
1634 (TREE_TYPE (olddecl), type);
1635
1636 type = cp_build_type_attribute_variant (type, attribs);
1637 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = type;
1638 }
1639
1640 /* If a function is explicitly declared "throw ()", propagate that to
1641 the corresponding builtin. */
1642 if (DECL_BUILT_IN_CLASS (olddecl) == BUILT_IN_NORMAL
1643 && DECL_ANTICIPATED (olddecl)
1644 && TREE_NOTHROW (newdecl)
1645 && !TREE_NOTHROW (olddecl))
1646 {
1647 enum built_in_function fncode = DECL_FUNCTION_CODE (olddecl);
1648 tree tmpdecl = builtin_decl_explicit (fncode);
1649 if (tmpdecl && tmpdecl != olddecl && types_match)
1650 TREE_NOTHROW (tmpdecl) = 1;
1651 }
1652
1653 /* Whether or not the builtin can throw exceptions has no
1654 bearing on this declarator. */
1655 TREE_NOTHROW (olddecl) = 0;
1656
1657 if (DECL_THIS_STATIC (newdecl) && !DECL_THIS_STATIC (olddecl))
1658 {
1659 /* If a builtin function is redeclared as `static', merge
1660 the declarations, but make the original one static. */
1661 DECL_THIS_STATIC (olddecl) = 1;
1662 TREE_PUBLIC (olddecl) = 0;
1663
1664 /* Make the old declaration consistent with the new one so
1665 that all remnants of the builtin-ness of this function
1666 will be banished. */
1667 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1668 COPY_DECL_RTL (newdecl, olddecl);
1669 }
1670 }
1671 else if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1672 {
1673 /* C++ Standard, 3.3, clause 4:
1674 "[Note: a namespace name or a class template name must be unique
1675 in its declarative region (7.3.2, clause 14). ]" */
1676 if (TREE_CODE (olddecl) == NAMESPACE_DECL
1677 || TREE_CODE (newdecl) == NAMESPACE_DECL)
1678 /* Namespace conflicts with not namespace. */;
1679 else if (DECL_TYPE_TEMPLATE_P (olddecl)
1680 || DECL_TYPE_TEMPLATE_P (newdecl))
1681 /* Class template conflicts. */;
1682 else if ((TREE_CODE (newdecl) == FUNCTION_DECL
1683 && DECL_FUNCTION_TEMPLATE_P (olddecl))
1684 || (TREE_CODE (olddecl) == FUNCTION_DECL
1685 && DECL_FUNCTION_TEMPLATE_P (newdecl)))
1686 {
1687 /* One is a function and the other is a template
1688 function. */
1689 if (!UDLIT_OPER_P (DECL_NAME (newdecl)))
1690 return NULL_TREE;
1691
1692 /* There can only be one! */
1693 if (TREE_CODE (newdecl) == TEMPLATE_DECL
1694 && check_raw_literal_operator (olddecl))
1695 error_at (newdecl_loc,
1696 "literal operator %q#D conflicts with"
1697 " raw literal operator", newdecl);
1698 else if (check_raw_literal_operator (newdecl))
1699 error_at (newdecl_loc,
1700 "raw literal operator %q#D conflicts with"
1701 " literal operator template", newdecl);
1702 else
1703 return NULL_TREE;
1704
1705 inform (olddecl_loc, "previous declaration %q#D", olddecl);
1706 return error_mark_node;
1707 }
1708 else if (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1709 || DECL_IMPLICIT_TYPEDEF_P (newdecl))
1710 /* One is an implicit typedef, that's ok. */
1711 return NULL_TREE;
1712
1713 error ("%q#D redeclared as different kind of entity", newdecl);
1714 inform (olddecl_loc, "previous declaration %q#D", olddecl);
1715
1716 return error_mark_node;
1717 }
1718 else if (!types_match)
1719 {
1720 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
1721 /* These are certainly not duplicate declarations; they're
1722 from different scopes. */
1723 return NULL_TREE;
1724
1725 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1726 {
1727 tree oldres = DECL_TEMPLATE_RESULT (olddecl);
1728 tree newres = DECL_TEMPLATE_RESULT (newdecl);
1729
1730 /* The name of a class template may not be declared to refer to
1731 any other template, class, function, object, namespace, value,
1732 or type in the same scope. */
1733 if (TREE_CODE (oldres) == TYPE_DECL
1734 || TREE_CODE (newres) == TYPE_DECL)
1735 {
1736 error_at (newdecl_loc,
1737 "conflicting declaration of template %q#D", newdecl);
1738 inform (olddecl_loc,
1739 "previous declaration %q#D", olddecl);
1740 return error_mark_node;
1741 }
1742
1743 else if (TREE_CODE (oldres) == FUNCTION_DECL
1744 && TREE_CODE (newres) == FUNCTION_DECL)
1745 {
1746 if (duplicate_function_template_decls (newdecl, olddecl))
1747 return error_mark_node;
1748 return NULL_TREE;
1749 }
1750 else if (check_concept_refinement (olddecl, newdecl))
1751 return error_mark_node;
1752 return NULL_TREE;
1753 }
1754 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1755 {
1756 if (DECL_EXTERN_C_P (newdecl) && DECL_EXTERN_C_P (olddecl))
1757 {
1758 error_at (newdecl_loc,
1759 "conflicting declaration of C function %q#D",
1760 newdecl);
1761 inform (olddecl_loc,
1762 "previous declaration %q#D", olddecl);
1763 return NULL_TREE;
1764 }
1765 /* For function versions, params and types match, but they
1766 are not ambiguous. */
1767 else if ((!DECL_FUNCTION_VERSIONED (newdecl)
1768 && !DECL_FUNCTION_VERSIONED (olddecl))
1769 // The functions have the same parameter types.
1770 && compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1771 TYPE_ARG_TYPES (TREE_TYPE (olddecl)))
1772 // And the same constraints.
1773 && equivalently_constrained (newdecl, olddecl))
1774 {
1775 error_at (newdecl_loc,
1776 "ambiguating new declaration of %q#D", newdecl);
1777 inform (olddecl_loc,
1778 "old declaration %q#D", olddecl);
1779 return error_mark_node;
1780 }
1781 else
1782 return NULL_TREE;
1783 }
1784 else
1785 {
1786 error_at (newdecl_loc, "conflicting declaration %q#D", newdecl);
1787 inform (olddecl_loc,
1788 "previous declaration as %q#D", olddecl);
1789 return error_mark_node;
1790 }
1791 }
1792 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1793 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1794 && (!DECL_TEMPLATE_INFO (newdecl)
1795 || (DECL_TI_TEMPLATE (newdecl)
1796 != DECL_TI_TEMPLATE (olddecl))))
1797 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1798 && (!DECL_TEMPLATE_INFO (olddecl)
1799 || (DECL_TI_TEMPLATE (olddecl)
1800 != DECL_TI_TEMPLATE (newdecl))))))
1801 /* It's OK to have a template specialization and a non-template
1802 with the same type, or to have specializations of two
1803 different templates with the same type. Note that if one is a
1804 specialization, and the other is an instantiation of the same
1805 template, that we do not exit at this point. That situation
1806 can occur if we instantiate a template class, and then
1807 specialize one of its methods. This situation is valid, but
1808 the declarations must be merged in the usual way. */
1809 return NULL_TREE;
1810 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1811 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1812 && !DECL_USE_TEMPLATE (newdecl))
1813 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1814 && !DECL_USE_TEMPLATE (olddecl))))
1815 /* One of the declarations is a template instantiation, and the
1816 other is not a template at all. That's OK. */
1817 return NULL_TREE;
1818 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1819 {
1820 /* In [namespace.alias] we have:
1821
1822 In a declarative region, a namespace-alias-definition can be
1823 used to redefine a namespace-alias declared in that declarative
1824 region to refer only to the namespace to which it already
1825 refers.
1826
1827 Therefore, if we encounter a second alias directive for the same
1828 alias, we can just ignore the second directive. */
1829 if (DECL_NAMESPACE_ALIAS (newdecl)
1830 && (DECL_NAMESPACE_ALIAS (newdecl)
1831 == DECL_NAMESPACE_ALIAS (olddecl)))
1832 return olddecl;
1833
1834 /* Leave it to update_binding to merge or report error. */
1835 return NULL_TREE;
1836 }
1837 else
1838 {
1839 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1840 if (errmsg)
1841 {
1842 auto_diagnostic_group d;
1843 error_at (newdecl_loc, errmsg, newdecl);
1844 if (DECL_NAME (olddecl) != NULL_TREE)
1845 inform (olddecl_loc,
1846 (DECL_INITIAL (olddecl) && namespace_bindings_p ())
1847 ? G_("%q#D previously defined here")
1848 : G_("%q#D previously declared here"), olddecl);
1849 return error_mark_node;
1850 }
1851 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1852 && DECL_INITIAL (olddecl) != NULL_TREE
1853 && !prototype_p (TREE_TYPE (olddecl))
1854 && prototype_p (TREE_TYPE (newdecl)))
1855 {
1856 /* Prototype decl follows defn w/o prototype. */
1857 auto_diagnostic_group d;
1858 if (warning_at (newdecl_loc, 0,
1859 "prototype specified for %q#D", newdecl))
1860 inform (olddecl_loc,
1861 "previous non-prototype definition here");
1862 }
1863 else if (VAR_OR_FUNCTION_DECL_P (olddecl)
1864 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1865 {
1866 /* [dcl.link]
1867 If two declarations of the same function or object
1868 specify different linkage-specifications ..., the program
1869 is ill-formed.... Except for functions with C++ linkage,
1870 a function declaration without a linkage specification
1871 shall not precede the first linkage specification for
1872 that function. A function can be declared without a
1873 linkage specification after an explicit linkage
1874 specification has been seen; the linkage explicitly
1875 specified in the earlier declaration is not affected by
1876 such a function declaration.
1877
1878 DR 563 raises the question why the restrictions on
1879 functions should not also apply to objects. Older
1880 versions of G++ silently ignore the linkage-specification
1881 for this example:
1882
1883 namespace N {
1884 extern int i;
1885 extern "C" int i;
1886 }
1887
1888 which is clearly wrong. Therefore, we now treat objects
1889 like functions. */
1890 if (current_lang_depth () == 0)
1891 {
1892 /* There is no explicit linkage-specification, so we use
1893 the linkage from the previous declaration. */
1894 retrofit_lang_decl (newdecl);
1895 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1896 }
1897 else
1898 {
1899 auto_diagnostic_group d;
1900 error_at (newdecl_loc,
1901 "conflicting declaration of %q#D with %qL linkage",
1902 newdecl, DECL_LANGUAGE (newdecl));
1903 inform (olddecl_loc,
1904 "previous declaration with %qL linkage",
1905 DECL_LANGUAGE (olddecl));
1906 }
1907 }
1908
1909 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1910 ;
1911 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1912 {
1913 /* Note: free functions, as TEMPLATE_DECLs, are handled below. */
1914 if (DECL_FUNCTION_MEMBER_P (olddecl)
1915 && (/* grokfndecl passes member function templates too
1916 as FUNCTION_DECLs. */
1917 DECL_TEMPLATE_INFO (olddecl)
1918 /* C++11 8.3.6/6.
1919 Default arguments for a member function of a class
1920 template shall be specified on the initial declaration
1921 of the member function within the class template. */
1922 || CLASSTYPE_TEMPLATE_INFO (CP_DECL_CONTEXT (olddecl))))
1923 check_redeclaration_no_default_args (newdecl);
1924 else
1925 {
1926 tree t1 = FUNCTION_FIRST_USER_PARMTYPE (olddecl);
1927 tree t2 = FUNCTION_FIRST_USER_PARMTYPE (newdecl);
1928 int i = 1;
1929
1930 for (; t1 && t1 != void_list_node;
1931 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1932 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1933 {
1934 if (simple_cst_equal (TREE_PURPOSE (t1),
1935 TREE_PURPOSE (t2)) == 1)
1936 {
1937 auto_diagnostic_group d;
1938 if (permerror (newdecl_loc,
1939 "default argument given for parameter "
1940 "%d of %q#D", i, newdecl))
1941 inform (olddecl_loc,
1942 "previous specification in %q#D here",
1943 olddecl);
1944 }
1945 else
1946 {
1947 auto_diagnostic_group d;
1948 error_at (newdecl_loc,
1949 "default argument given for parameter %d "
1950 "of %q#D", i, newdecl);
1951 inform (olddecl_loc,
1952 "previous specification in %q#D here",
1953 olddecl);
1954 }
1955 }
1956
1957 /* C++17 11.3.6/4: "If a friend declaration specifies a default
1958 argument expression, that declaration... shall be the only
1959 declaration of the function or function template in the
1960 translation unit." */
1961 check_no_redeclaration_friend_default_args
1962 (olddecl, newdecl, DECL_HIDDEN_FRIEND_P (olddecl));
1963 }
1964 }
1965 }
1966
1967 /* Do not merge an implicit typedef with an explicit one. In:
1968
1969 class A;
1970 ...
1971 typedef class A A __attribute__ ((foo));
1972
1973 the attribute should apply only to the typedef. */
1974 if (TREE_CODE (olddecl) == TYPE_DECL
1975 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1976 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1977 return NULL_TREE;
1978
1979 if (!validate_constexpr_redeclaration (olddecl, newdecl))
1980 return error_mark_node;
1981
1982 /* We have committed to returning OLDDECL at this point. */
1983
1984 /* If new decl is `static' and an `extern' was seen previously,
1985 warn about it. */
1986 warn_extern_redeclared_static (newdecl, olddecl);
1987
1988 /* True to merge attributes between the declarations, false to
1989 set OLDDECL's attributes to those of NEWDECL (for template
1990 explicit specializations that specify their own attributes
1991 independent of those specified for the primary template). */
1992 const bool merge_attr = (TREE_CODE (newdecl) != FUNCTION_DECL
1993 || !DECL_TEMPLATE_SPECIALIZATION (newdecl)
1994 || DECL_TEMPLATE_SPECIALIZATION (olddecl));
1995
1996 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1997 {
1998 if (merge_attr)
1999 {
2000 if (diagnose_mismatched_attributes (olddecl, newdecl))
2001 inform (olddecl_loc, DECL_INITIAL (olddecl)
2002 ? G_("previous definition of %qD here")
2003 : G_("previous declaration of %qD here"), olddecl);
2004
2005 /* [dcl.attr.noreturn]: The first declaration of a function shall
2006 specify the noreturn attribute if any declaration of that function
2007 specifies the noreturn attribute. */
2008 tree a;
2009 if (TREE_THIS_VOLATILE (newdecl)
2010 && !TREE_THIS_VOLATILE (olddecl)
2011 /* This applies to [[noreturn]] only, not its GNU variants. */
2012 && (a = lookup_attribute ("noreturn", DECL_ATTRIBUTES (newdecl)))
2013 && cxx11_attribute_p (a)
2014 && get_attribute_namespace (a) == NULL_TREE)
2015 {
2016 error_at (newdecl_loc, "function %qD declared %<[[noreturn]]%> "
2017 "but its first declaration was not", newdecl);
2018 inform (olddecl_loc, "previous declaration of %qD", olddecl);
2019 }
2020 }
2021
2022 /* Now that functions must hold information normally held
2023 by field decls, there is extra work to do so that
2024 declaration information does not get destroyed during
2025 definition. */
2026 if (DECL_VINDEX (olddecl))
2027 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
2028 if (DECL_CONTEXT (olddecl))
2029 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
2030 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
2031 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
2032 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
2033 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
2034 DECL_INVALID_OVERRIDER_P (newdecl) |= DECL_INVALID_OVERRIDER_P (olddecl);
2035 DECL_FINAL_P (newdecl) |= DECL_FINAL_P (olddecl);
2036 DECL_OVERRIDE_P (newdecl) |= DECL_OVERRIDE_P (olddecl);
2037 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
2038 DECL_HAS_DEPENDENT_EXPLICIT_SPEC_P (newdecl)
2039 |= DECL_HAS_DEPENDENT_EXPLICIT_SPEC_P (olddecl);
2040 if (DECL_OVERLOADED_OPERATOR_P (olddecl))
2041 DECL_OVERLOADED_OPERATOR_CODE_RAW (newdecl)
2042 = DECL_OVERLOADED_OPERATOR_CODE_RAW (olddecl);
2043 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
2044
2045 /* Optionally warn about more than one declaration for the same
2046 name, but don't warn about a function declaration followed by a
2047 definition. */
2048 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
2049 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
2050 /* Don't warn about extern decl followed by definition. */
2051 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
2052 /* Don't warn about friends, let add_friend take care of it. */
2053 && ! (newdecl_is_friend || DECL_FRIEND_P (olddecl))
2054 /* Don't warn about declaration followed by specialization. */
2055 && (! DECL_TEMPLATE_SPECIALIZATION (newdecl)
2056 || DECL_TEMPLATE_SPECIALIZATION (olddecl)))
2057 {
2058 auto_diagnostic_group d;
2059 if (warning_at (newdecl_loc,
2060 OPT_Wredundant_decls,
2061 "redundant redeclaration of %qD in same scope",
2062 newdecl))
2063 inform (olddecl_loc,
2064 "previous declaration of %qD", olddecl);
2065 }
2066
2067 if (!(DECL_TEMPLATE_INSTANTIATION (olddecl)
2068 && DECL_TEMPLATE_SPECIALIZATION (newdecl)))
2069 {
2070 if (DECL_DELETED_FN (newdecl))
2071 {
2072 auto_diagnostic_group d;
2073 error_at (newdecl_loc, "deleted definition of %qD", newdecl);
2074 inform (olddecl_loc,
2075 "previous declaration of %qD", olddecl);
2076 }
2077 DECL_DELETED_FN (newdecl) |= DECL_DELETED_FN (olddecl);
2078 }
2079 }
2080
2081 /* Deal with C++: must preserve virtual function table size. */
2082 if (TREE_CODE (olddecl) == TYPE_DECL)
2083 {
2084 tree newtype = TREE_TYPE (newdecl);
2085 tree oldtype = TREE_TYPE (olddecl);
2086
2087 if (newtype != error_mark_node && oldtype != error_mark_node
2088 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
2089 CLASSTYPE_FRIEND_CLASSES (newtype)
2090 = CLASSTYPE_FRIEND_CLASSES (oldtype);
2091
2092 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
2093 }
2094
2095 /* Copy all the DECL_... slots specified in the new decl except for
2096 any that we copy here from the old type. */
2097 if (merge_attr)
2098 DECL_ATTRIBUTES (newdecl)
2099 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
2100 else
2101 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2102
2103 if (DECL_DECLARES_FUNCTION_P (olddecl))
2104 {
2105 olddecl_friend = DECL_FRIEND_P (olddecl);
2106 olddecl_hidden_friend = DECL_HIDDEN_FRIEND_P (olddecl);
2107 hidden_friend = (DECL_ANTICIPATED (olddecl)
2108 && DECL_HIDDEN_FRIEND_P (olddecl)
2109 && newdecl_is_friend);
2110 if (!hidden_friend)
2111 {
2112 DECL_ANTICIPATED (olddecl) = 0;
2113 DECL_HIDDEN_FRIEND_P (olddecl) = 0;
2114 }
2115 }
2116
2117 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
2118 {
2119 tree old_result = DECL_TEMPLATE_RESULT (olddecl);
2120 tree new_result = DECL_TEMPLATE_RESULT (newdecl);
2121 TREE_TYPE (olddecl) = TREE_TYPE (old_result);
2122
2123 /* The new decl should not already have gathered any
2124 specializations. */
2125 gcc_assert (!DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
2126
2127 DECL_ATTRIBUTES (old_result)
2128 = (*targetm.merge_decl_attributes) (old_result, new_result);
2129
2130 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
2131 {
2132 if (DECL_SOURCE_LOCATION (newdecl)
2133 != DECL_SOURCE_LOCATION (olddecl))
2134 {
2135 /* Per C++11 8.3.6/4, default arguments cannot be added in
2136 later declarations of a function template. */
2137 check_redeclaration_no_default_args (newdecl);
2138 /* C++17 11.3.6/4: "If a friend declaration specifies a default
2139 argument expression, that declaration... shall be the only
2140 declaration of the function or function template in the
2141 translation unit." */
2142 check_no_redeclaration_friend_default_args
2143 (old_result, new_result, olddecl_hidden_friend);
2144 }
2145
2146 check_default_args (newdecl);
2147
2148 if (GNU_INLINE_P (old_result) != GNU_INLINE_P (new_result)
2149 && DECL_INITIAL (new_result))
2150 {
2151 if (DECL_INITIAL (old_result))
2152 DECL_UNINLINABLE (old_result) = 1;
2153 else
2154 DECL_UNINLINABLE (old_result) = DECL_UNINLINABLE (new_result);
2155 DECL_EXTERNAL (old_result) = DECL_EXTERNAL (new_result);
2156 DECL_NOT_REALLY_EXTERN (old_result)
2157 = DECL_NOT_REALLY_EXTERN (new_result);
2158 DECL_INTERFACE_KNOWN (old_result)
2159 = DECL_INTERFACE_KNOWN (new_result);
2160 DECL_DECLARED_INLINE_P (old_result)
2161 = DECL_DECLARED_INLINE_P (new_result);
2162 DECL_DISREGARD_INLINE_LIMITS (old_result)
2163 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
2164
2165 }
2166 else
2167 {
2168 DECL_DECLARED_INLINE_P (old_result)
2169 |= DECL_DECLARED_INLINE_P (new_result);
2170 DECL_DISREGARD_INLINE_LIMITS (old_result)
2171 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
2172 check_redeclaration_exception_specification (newdecl, olddecl);
2173
2174 merge_attribute_bits (new_result, old_result);
2175 }
2176 }
2177
2178 /* If the new declaration is a definition, update the file and
2179 line information on the declaration, and also make
2180 the old declaration the same definition. */
2181 if (DECL_INITIAL (new_result) != NULL_TREE)
2182 {
2183 DECL_SOURCE_LOCATION (olddecl)
2184 = DECL_SOURCE_LOCATION (old_result)
2185 = DECL_SOURCE_LOCATION (newdecl);
2186 DECL_INITIAL (old_result) = DECL_INITIAL (new_result);
2187 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
2188 {
2189 tree parm;
2190 DECL_ARGUMENTS (old_result)
2191 = DECL_ARGUMENTS (new_result);
2192 for (parm = DECL_ARGUMENTS (old_result); parm;
2193 parm = DECL_CHAIN (parm))
2194 DECL_CONTEXT (parm) = old_result;
2195 }
2196 }
2197
2198 return olddecl;
2199 }
2200
2201 if (types_match)
2202 {
2203 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2204 check_redeclaration_exception_specification (newdecl, olddecl);
2205
2206 /* Automatically handles default parameters. */
2207 tree oldtype = TREE_TYPE (olddecl);
2208 tree newtype;
2209
2210 /* For typedefs use the old type, as the new type's DECL_NAME points
2211 at newdecl, which will be ggc_freed. */
2212 if (TREE_CODE (newdecl) == TYPE_DECL)
2213 {
2214 /* But NEWTYPE might have an attribute, honor that. */
2215 tree tem = TREE_TYPE (newdecl);
2216 newtype = oldtype;
2217
2218 if (TYPE_USER_ALIGN (tem))
2219 {
2220 if (TYPE_ALIGN (tem) > TYPE_ALIGN (newtype))
2221 SET_TYPE_ALIGN (newtype, TYPE_ALIGN (tem));
2222 TYPE_USER_ALIGN (newtype) = true;
2223 }
2224
2225 /* And remove the new type from the variants list. */
2226 if (TYPE_NAME (TREE_TYPE (newdecl)) == newdecl)
2227 {
2228 tree remove = TREE_TYPE (newdecl);
2229 if (TYPE_MAIN_VARIANT (remove) == remove)
2230 {
2231 gcc_assert (TYPE_NEXT_VARIANT (remove) == NULL_TREE);
2232 /* If remove is the main variant, no need to remove that
2233 from the list. One of the DECL_ORIGINAL_TYPE
2234 variants, e.g. created for aligned attribute, might still
2235 refer to the newdecl TYPE_DECL though, so remove that one
2236 in that case. */
2237 if (tree orig = DECL_ORIGINAL_TYPE (newdecl))
2238 if (orig != remove)
2239 for (tree t = TYPE_MAIN_VARIANT (orig); t;
2240 t = TYPE_MAIN_VARIANT (t))
2241 if (TYPE_NAME (TYPE_NEXT_VARIANT (t)) == newdecl)
2242 {
2243 TYPE_NEXT_VARIANT (t)
2244 = TYPE_NEXT_VARIANT (TYPE_NEXT_VARIANT (t));
2245 break;
2246 }
2247 }
2248 else
2249 for (tree t = TYPE_MAIN_VARIANT (remove); ;
2250 t = TYPE_NEXT_VARIANT (t))
2251 if (TYPE_NEXT_VARIANT (t) == remove)
2252 {
2253 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (remove);
2254 break;
2255 }
2256 }
2257 }
2258 else if (merge_attr)
2259 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
2260 else
2261 newtype = TREE_TYPE (newdecl);
2262
2263 if (VAR_P (newdecl))
2264 {
2265 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
2266 /* For already initialized vars, TREE_READONLY could have been
2267 cleared in cp_finish_decl, because the var needs runtime
2268 initialization or destruction. Make sure not to set
2269 TREE_READONLY on it again. */
2270 if (DECL_INITIALIZED_P (olddecl)
2271 && !DECL_EXTERNAL (olddecl)
2272 && !TREE_READONLY (olddecl))
2273 TREE_READONLY (newdecl) = 0;
2274 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
2275 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl)
2276 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl);
2277 if (DECL_DEPENDENT_INIT_P (olddecl))
2278 SET_DECL_DEPENDENT_INIT_P (newdecl, true);
2279 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
2280 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
2281 DECL_DECLARED_CONSTEXPR_P (newdecl)
2282 |= DECL_DECLARED_CONSTEXPR_P (olddecl);
2283
2284 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
2285 if (DECL_LANG_SPECIFIC (olddecl)
2286 && CP_DECL_THREADPRIVATE_P (olddecl))
2287 {
2288 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
2289 retrofit_lang_decl (newdecl);
2290 CP_DECL_THREADPRIVATE_P (newdecl) = 1;
2291 }
2292 }
2293
2294 /* An explicit specialization of a function template or of a member
2295 function of a class template can be declared transaction_safe
2296 independently of whether the corresponding template entity is declared
2297 transaction_safe. */
2298 if (flag_tm && TREE_CODE (newdecl) == FUNCTION_DECL
2299 && DECL_TEMPLATE_INSTANTIATION (olddecl)
2300 && DECL_TEMPLATE_SPECIALIZATION (newdecl)
2301 && tx_safe_fn_type_p (newtype)
2302 && !tx_safe_fn_type_p (TREE_TYPE (newdecl)))
2303 newtype = tx_unsafe_fn_variant (newtype);
2304
2305 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
2306
2307 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2308 check_default_args (newdecl);
2309
2310 /* Lay the type out, unless already done. */
2311 if (! same_type_p (newtype, oldtype)
2312 && TREE_TYPE (newdecl) != error_mark_node
2313 && !(processing_template_decl && uses_template_parms (newdecl)))
2314 layout_type (TREE_TYPE (newdecl));
2315
2316 if ((VAR_P (newdecl)
2317 || TREE_CODE (newdecl) == PARM_DECL
2318 || TREE_CODE (newdecl) == RESULT_DECL
2319 || TREE_CODE (newdecl) == FIELD_DECL
2320 || TREE_CODE (newdecl) == TYPE_DECL)
2321 && !(processing_template_decl && uses_template_parms (newdecl)))
2322 layout_decl (newdecl, 0);
2323
2324 /* Merge deprecatedness. */
2325 if (TREE_DEPRECATED (newdecl))
2326 TREE_DEPRECATED (olddecl) = 1;
2327
2328 /* Preserve function specific target and optimization options */
2329 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2330 {
2331 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
2332 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
2333 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
2334 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
2335
2336 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
2337 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
2338 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
2339 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
2340 }
2341 else
2342 {
2343 /* Merge the const type qualifier. */
2344 if (TREE_READONLY (newdecl))
2345 TREE_READONLY (olddecl) = 1;
2346 /* Merge the volatile type qualifier. */
2347 if (TREE_THIS_VOLATILE (newdecl))
2348 TREE_THIS_VOLATILE (olddecl) = 1;
2349 }
2350
2351 /* Merge the initialization information. */
2352 if (DECL_INITIAL (newdecl) == NULL_TREE
2353 && DECL_INITIAL (olddecl) != NULL_TREE)
2354 {
2355 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2356 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
2357 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2358 {
2359 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
2360 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
2361 }
2362 }
2363
2364 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2365 {
2366 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
2367 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
2368 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
2369 if (DECL_IS_OPERATOR_NEW_P (olddecl))
2370 DECL_SET_IS_OPERATOR_NEW (newdecl, true);
2371 DECL_LOOPING_CONST_OR_PURE_P (newdecl)
2372 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl);
2373 DECL_IS_REPLACEABLE_OPERATOR (newdecl)
2374 |= DECL_IS_REPLACEABLE_OPERATOR (olddecl);
2375
2376 if (merge_attr)
2377 merge_attribute_bits (newdecl, olddecl);
2378 else
2379 {
2380 /* Merge the noreturn bit. */
2381 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
2382 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
2383 TREE_NOTHROW (olddecl) = TREE_NOTHROW (newdecl);
2384 DECL_IS_MALLOC (olddecl) = DECL_IS_MALLOC (newdecl);
2385 DECL_PURE_P (olddecl) = DECL_PURE_P (newdecl);
2386 }
2387 /* Keep the old RTL. */
2388 COPY_DECL_RTL (olddecl, newdecl);
2389 }
2390 else if (VAR_P (newdecl)
2391 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
2392 {
2393 /* Keep the old RTL. We cannot keep the old RTL if the old
2394 declaration was for an incomplete object and the new
2395 declaration is not since many attributes of the RTL will
2396 change. */
2397 COPY_DECL_RTL (olddecl, newdecl);
2398 }
2399 }
2400 /* If cannot merge, then use the new type and qualifiers,
2401 and don't preserve the old rtl. */
2402 else
2403 {
2404 /* Clean out any memory we had of the old declaration. */
2405 tree oldstatic = value_member (olddecl, static_aggregates);
2406 if (oldstatic)
2407 TREE_VALUE (oldstatic) = error_mark_node;
2408
2409 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
2410 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
2411 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
2412 TREE_NOTHROW (olddecl) = TREE_NOTHROW (newdecl);
2413 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
2414 }
2415
2416 /* Merge the storage class information. */
2417 merge_weak (newdecl, olddecl);
2418
2419 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
2420 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
2421 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
2422 if (! DECL_EXTERNAL (olddecl))
2423 DECL_EXTERNAL (newdecl) = 0;
2424 if (! DECL_COMDAT (olddecl))
2425 DECL_COMDAT (newdecl) = 0;
2426
2427 new_template_info = NULL_TREE;
2428 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
2429 {
2430 bool new_redefines_gnu_inline = false;
2431
2432 if (new_defines_function
2433 && ((DECL_INTERFACE_KNOWN (olddecl)
2434 && TREE_CODE (olddecl) == FUNCTION_DECL)
2435 || (TREE_CODE (olddecl) == TEMPLATE_DECL
2436 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
2437 == FUNCTION_DECL))))
2438 {
2439 tree fn = olddecl;
2440
2441 if (TREE_CODE (fn) == TEMPLATE_DECL)
2442 fn = DECL_TEMPLATE_RESULT (olddecl);
2443
2444 new_redefines_gnu_inline = GNU_INLINE_P (fn) && DECL_INITIAL (fn);
2445 }
2446
2447 if (!new_redefines_gnu_inline)
2448 {
2449 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
2450 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
2451 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
2452 }
2453 DECL_TEMPLATE_INSTANTIATED (newdecl)
2454 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
2455 DECL_ODR_USED (newdecl) |= DECL_ODR_USED (olddecl);
2456
2457 /* If the OLDDECL is an instantiation and/or specialization,
2458 then the NEWDECL must be too. But, it may not yet be marked
2459 as such if the caller has created NEWDECL, but has not yet
2460 figured out that it is a redeclaration. */
2461 if (!DECL_USE_TEMPLATE (newdecl))
2462 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
2463
2464 /* Don't really know how much of the language-specific
2465 values we should copy from old to new. */
2466 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
2467 DECL_INITIALIZED_IN_CLASS_P (newdecl)
2468 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
2469
2470 if (LANG_DECL_HAS_MIN (newdecl))
2471 {
2472 DECL_ACCESS (newdecl) = DECL_ACCESS (olddecl);
2473 if (DECL_TEMPLATE_INFO (newdecl))
2474 {
2475 new_template_info = DECL_TEMPLATE_INFO (newdecl);
2476 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
2477 && DECL_TEMPLATE_SPECIALIZATION (newdecl))
2478 /* Remember the presence of explicit specialization args. */
2479 TINFO_USED_TEMPLATE_ID (DECL_TEMPLATE_INFO (olddecl))
2480 = TINFO_USED_TEMPLATE_ID (new_template_info);
2481 }
2482 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
2483 }
2484
2485 if (DECL_DECLARES_FUNCTION_P (newdecl))
2486 {
2487 /* Only functions have these fields. */
2488 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
2489 DECL_BEFRIENDING_CLASSES (newdecl)
2490 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
2491 DECL_BEFRIENDING_CLASSES (olddecl));
2492 /* DECL_THUNKS is only valid for virtual functions,
2493 otherwise it is a DECL_FRIEND_CONTEXT. */
2494 if (DECL_VIRTUAL_P (newdecl))
2495 SET_DECL_THUNKS (newdecl, DECL_THUNKS (olddecl));
2496 }
2497 else if (VAR_P (newdecl))
2498 {
2499 /* Only variables have this field. */
2500 if (VAR_HAD_UNKNOWN_BOUND (olddecl))
2501 SET_VAR_HAD_UNKNOWN_BOUND (newdecl);
2502 }
2503 }
2504
2505 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2506 {
2507 tree parm;
2508
2509 /* Merge parameter attributes. */
2510 tree oldarg, newarg;
2511 for (oldarg = DECL_ARGUMENTS(olddecl), newarg = DECL_ARGUMENTS(newdecl);
2512 oldarg && newarg;
2513 oldarg = DECL_CHAIN(oldarg), newarg = DECL_CHAIN(newarg))
2514 {
2515 DECL_ATTRIBUTES (newarg)
2516 = (*targetm.merge_decl_attributes) (oldarg, newarg);
2517 DECL_ATTRIBUTES (oldarg) = DECL_ATTRIBUTES (newarg);
2518 }
2519
2520 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
2521 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
2522 {
2523 /* If newdecl is not a specialization, then it is not a
2524 template-related function at all. And that means that we
2525 should have exited above, returning 0. */
2526 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
2527
2528 if (DECL_ODR_USED (olddecl))
2529 /* From [temp.expl.spec]:
2530
2531 If a template, a member template or the member of a class
2532 template is explicitly specialized then that
2533 specialization shall be declared before the first use of
2534 that specialization that would cause an implicit
2535 instantiation to take place, in every translation unit in
2536 which such a use occurs. */
2537 error ("explicit specialization of %qD after first use",
2538 olddecl);
2539
2540 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
2541 DECL_COMDAT (newdecl) = (TREE_PUBLIC (newdecl)
2542 && DECL_DECLARED_INLINE_P (newdecl));
2543
2544 /* Don't propagate visibility from the template to the
2545 specialization here. We'll do that in determine_visibility if
2546 appropriate. */
2547 DECL_VISIBILITY_SPECIFIED (olddecl) = 0;
2548
2549 /* [temp.expl.spec/14] We don't inline explicit specialization
2550 just because the primary template says so. */
2551 gcc_assert (!merge_attr);
2552
2553 DECL_DECLARED_INLINE_P (olddecl)
2554 = DECL_DECLARED_INLINE_P (newdecl);
2555
2556 DECL_DISREGARD_INLINE_LIMITS (olddecl)
2557 = DECL_DISREGARD_INLINE_LIMITS (newdecl);
2558
2559 DECL_UNINLINABLE (olddecl) = DECL_UNINLINABLE (newdecl);
2560 }
2561 else if (new_defines_function && DECL_INITIAL (olddecl))
2562 {
2563 /* Never inline re-defined extern inline functions.
2564 FIXME: this could be better handled by keeping both
2565 function as separate declarations. */
2566 DECL_UNINLINABLE (newdecl) = 1;
2567 }
2568 else
2569 {
2570 if (DECL_PENDING_INLINE_P (olddecl))
2571 {
2572 DECL_PENDING_INLINE_P (newdecl) = 1;
2573 DECL_PENDING_INLINE_INFO (newdecl)
2574 = DECL_PENDING_INLINE_INFO (olddecl);
2575 }
2576 else if (DECL_PENDING_INLINE_P (newdecl))
2577 ;
2578 else if (DECL_SAVED_AUTO_RETURN_TYPE (newdecl) == NULL)
2579 DECL_SAVED_AUTO_RETURN_TYPE (newdecl)
2580 = DECL_SAVED_AUTO_RETURN_TYPE (olddecl);
2581
2582 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
2583
2584 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
2585 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
2586
2587 DECL_DISREGARD_INLINE_LIMITS (newdecl)
2588 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
2589 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
2590 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
2591 }
2592
2593 /* Preserve abstractness on cloned [cd]tors. */
2594 DECL_ABSTRACT_P (newdecl) = DECL_ABSTRACT_P (olddecl);
2595
2596 /* Update newdecl's parms to point at olddecl. */
2597 for (parm = DECL_ARGUMENTS (newdecl); parm;
2598 parm = DECL_CHAIN (parm))
2599 DECL_CONTEXT (parm) = olddecl;
2600
2601 if (! types_match)
2602 {
2603 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
2604 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
2605 COPY_DECL_RTL (newdecl, olddecl);
2606 }
2607 if (! types_match || new_defines_function)
2608 {
2609 /* These need to be copied so that the names are available.
2610 Note that if the types do match, we'll preserve inline
2611 info and other bits, but if not, we won't. */
2612 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
2613 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
2614 }
2615 /* If redeclaring a builtin function, it stays built in
2616 if newdecl is a gnu_inline definition, or if newdecl is just
2617 a declaration. */
2618 if (fndecl_built_in_p (olddecl)
2619 && (new_defines_function ? GNU_INLINE_P (newdecl) : types_match))
2620 {
2621 copy_decl_built_in_function (newdecl, olddecl);
2622 /* If we're keeping the built-in definition, keep the rtl,
2623 regardless of declaration matches. */
2624 COPY_DECL_RTL (olddecl, newdecl);
2625 if (DECL_BUILT_IN_CLASS (newdecl) == BUILT_IN_NORMAL)
2626 {
2627 enum built_in_function fncode = DECL_FUNCTION_CODE (newdecl);
2628 switch (fncode)
2629 {
2630 /* If a compatible prototype of these builtin functions
2631 is seen, assume the runtime implements it with the
2632 expected semantics. */
2633 case BUILT_IN_STPCPY:
2634 if (builtin_decl_explicit_p (fncode))
2635 set_builtin_decl_implicit_p (fncode, true);
2636 break;
2637 default:
2638 if (builtin_decl_explicit_p (fncode))
2639 set_builtin_decl_declared_p (fncode, true);
2640 break;
2641 }
2642
2643 copy_attributes_to_builtin (newdecl);
2644 }
2645 }
2646 if (new_defines_function)
2647 /* If defining a function declared with other language
2648 linkage, use the previously declared language linkage. */
2649 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
2650 else if (types_match)
2651 {
2652 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2653 /* Don't clear out the arguments if we're just redeclaring a
2654 function. */
2655 if (DECL_ARGUMENTS (olddecl))
2656 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2657 }
2658 }
2659 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
2660 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
2661
2662 /* Now preserve various other info from the definition. */
2663 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
2664 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
2665 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2666 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2667
2668 /* Warn about conflicting visibility specifications. */
2669 if (DECL_VISIBILITY_SPECIFIED (olddecl)
2670 && DECL_VISIBILITY_SPECIFIED (newdecl)
2671 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2672 {
2673 auto_diagnostic_group d;
2674 if (warning_at (newdecl_loc, OPT_Wattributes,
2675 "%qD: visibility attribute ignored because it "
2676 "conflicts with previous declaration", newdecl))
2677 inform (olddecl_loc,
2678 "previous declaration of %qD", olddecl);
2679 }
2680 /* Choose the declaration which specified visibility. */
2681 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2682 {
2683 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2684 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2685 }
2686 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2687 so keep this behavior. */
2688 if (VAR_P (newdecl) && DECL_HAS_INIT_PRIORITY_P (newdecl))
2689 {
2690 SET_DECL_INIT_PRIORITY (olddecl, DECL_INIT_PRIORITY (newdecl));
2691 DECL_HAS_INIT_PRIORITY_P (olddecl) = 1;
2692 }
2693 /* Likewise for DECL_ALIGN, DECL_USER_ALIGN and DECL_PACKED. */
2694 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
2695 {
2696 SET_DECL_ALIGN (newdecl, DECL_ALIGN (olddecl));
2697 DECL_USER_ALIGN (newdecl) |= DECL_USER_ALIGN (olddecl);
2698 }
2699 DECL_USER_ALIGN (olddecl) = DECL_USER_ALIGN (newdecl);
2700 if (DECL_WARN_IF_NOT_ALIGN (olddecl)
2701 > DECL_WARN_IF_NOT_ALIGN (newdecl))
2702 SET_DECL_WARN_IF_NOT_ALIGN (newdecl,
2703 DECL_WARN_IF_NOT_ALIGN (olddecl));
2704 if (TREE_CODE (newdecl) == FIELD_DECL)
2705 DECL_PACKED (olddecl) = DECL_PACKED (newdecl);
2706
2707 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2708 with that from NEWDECL below. */
2709 if (DECL_LANG_SPECIFIC (olddecl))
2710 {
2711 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
2712 != DECL_LANG_SPECIFIC (newdecl));
2713 ggc_free (DECL_LANG_SPECIFIC (olddecl));
2714 }
2715
2716 /* Merge the USED information. */
2717 if (TREE_USED (olddecl))
2718 TREE_USED (newdecl) = 1;
2719 else if (TREE_USED (newdecl))
2720 TREE_USED (olddecl) = 1;
2721 if (VAR_P (newdecl))
2722 {
2723 if (DECL_READ_P (olddecl))
2724 DECL_READ_P (newdecl) = 1;
2725 else if (DECL_READ_P (newdecl))
2726 DECL_READ_P (olddecl) = 1;
2727 }
2728 if (DECL_PRESERVE_P (olddecl))
2729 DECL_PRESERVE_P (newdecl) = 1;
2730 else if (DECL_PRESERVE_P (newdecl))
2731 DECL_PRESERVE_P (olddecl) = 1;
2732
2733 /* Merge the DECL_FUNCTION_VERSIONED information. newdecl will be copied
2734 to olddecl and deleted. */
2735 if (TREE_CODE (newdecl) == FUNCTION_DECL
2736 && DECL_FUNCTION_VERSIONED (olddecl))
2737 {
2738 /* Set the flag for newdecl so that it gets copied to olddecl. */
2739 DECL_FUNCTION_VERSIONED (newdecl) = 1;
2740 /* newdecl will be purged after copying to olddecl and is no longer
2741 a version. */
2742 cgraph_node::delete_function_version_by_decl (newdecl);
2743 }
2744
2745 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2746 {
2747 int function_size;
2748 struct symtab_node *snode = symtab_node::get (olddecl);
2749
2750 function_size = sizeof (struct tree_decl_common);
2751
2752 memcpy ((char *) olddecl + sizeof (struct tree_common),
2753 (char *) newdecl + sizeof (struct tree_common),
2754 function_size - sizeof (struct tree_common));
2755
2756 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2757 (char *) newdecl + sizeof (struct tree_decl_common),
2758 sizeof (struct tree_function_decl) - sizeof (struct tree_decl_common));
2759
2760 /* Preserve symtab node mapping. */
2761 olddecl->decl_with_vis.symtab_node = snode;
2762
2763 if (new_template_info)
2764 /* If newdecl is a template instantiation, it is possible that
2765 the following sequence of events has occurred:
2766
2767 o A friend function was declared in a class template. The
2768 class template was instantiated.
2769
2770 o The instantiation of the friend declaration was
2771 recorded on the instantiation list, and is newdecl.
2772
2773 o Later, however, instantiate_class_template called pushdecl
2774 on the newdecl to perform name injection. But, pushdecl in
2775 turn called duplicate_decls when it discovered that another
2776 declaration of a global function with the same name already
2777 existed.
2778
2779 o Here, in duplicate_decls, we decided to clobber newdecl.
2780
2781 If we're going to do that, we'd better make sure that
2782 olddecl, and not newdecl, is on the list of
2783 instantiations so that if we try to do the instantiation
2784 again we won't get the clobbered declaration. */
2785 reregister_specialization (newdecl,
2786 new_template_info,
2787 olddecl);
2788 }
2789 else
2790 {
2791 size_t size = tree_code_size (TREE_CODE (newdecl));
2792
2793 memcpy ((char *) olddecl + sizeof (struct tree_common),
2794 (char *) newdecl + sizeof (struct tree_common),
2795 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2796 switch (TREE_CODE (newdecl))
2797 {
2798 case LABEL_DECL:
2799 case VAR_DECL:
2800 case RESULT_DECL:
2801 case PARM_DECL:
2802 case FIELD_DECL:
2803 case TYPE_DECL:
2804 case CONST_DECL:
2805 {
2806 struct symtab_node *snode = NULL;
2807
2808 if (VAR_P (newdecl)
2809 && (TREE_STATIC (olddecl) || TREE_PUBLIC (olddecl)
2810 || DECL_EXTERNAL (olddecl)))
2811 snode = symtab_node::get (olddecl);
2812 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2813 (char *) newdecl + sizeof (struct tree_decl_common),
2814 size - sizeof (struct tree_decl_common)
2815 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2816 if (VAR_P (newdecl))
2817 olddecl->decl_with_vis.symtab_node = snode;
2818 }
2819 break;
2820 default:
2821 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2822 (char *) newdecl + sizeof (struct tree_decl_common),
2823 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)
2824 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2825 break;
2826 }
2827 }
2828
2829 if (VAR_OR_FUNCTION_DECL_P (newdecl))
2830 {
2831 if (DECL_EXTERNAL (olddecl)
2832 || TREE_PUBLIC (olddecl)
2833 || TREE_STATIC (olddecl))
2834 {
2835 /* Merge the section attribute.
2836 We want to issue an error if the sections conflict but that must be
2837 done later in decl_attributes since we are called before attributes
2838 are assigned. */
2839 if (DECL_SECTION_NAME (newdecl) != NULL)
2840 set_decl_section_name (olddecl, DECL_SECTION_NAME (newdecl));
2841
2842 if (DECL_ONE_ONLY (newdecl))
2843 {
2844 struct symtab_node *oldsym, *newsym;
2845 if (TREE_CODE (olddecl) == FUNCTION_DECL)
2846 oldsym = cgraph_node::get_create (olddecl);
2847 else
2848 oldsym = varpool_node::get_create (olddecl);
2849 newsym = symtab_node::get (newdecl);
2850 oldsym->set_comdat_group (newsym->get_comdat_group ());
2851 }
2852 }
2853
2854 if (VAR_P (newdecl)
2855 && CP_DECL_THREAD_LOCAL_P (newdecl))
2856 {
2857 CP_DECL_THREAD_LOCAL_P (olddecl) = true;
2858 if (!processing_template_decl)
2859 set_decl_tls_model (olddecl, DECL_TLS_MODEL (newdecl));
2860 }
2861 }
2862
2863 DECL_UID (olddecl) = olddecl_uid;
2864 if (olddecl_friend)
2865 DECL_FRIEND_P (olddecl) = 1;
2866 if (hidden_friend)
2867 {
2868 DECL_ANTICIPATED (olddecl) = 1;
2869 DECL_HIDDEN_FRIEND_P (olddecl) = 1;
2870 }
2871
2872 /* NEWDECL contains the merged attribute lists.
2873 Update OLDDECL to be the same. */
2874 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2875
2876 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2877 so that encode_section_info has a chance to look at the new decl
2878 flags and attributes. */
2879 if (DECL_RTL_SET_P (olddecl)
2880 && (TREE_CODE (olddecl) == FUNCTION_DECL
2881 || (VAR_P (olddecl)
2882 && TREE_STATIC (olddecl))))
2883 make_decl_rtl (olddecl);
2884
2885 /* The NEWDECL will no longer be needed. Because every out-of-class
2886 declaration of a member results in a call to duplicate_decls,
2887 freeing these nodes represents in a significant savings.
2888
2889 Before releasing the node, be sore to remove function from symbol
2890 table that might have been inserted there to record comdat group.
2891 Be sure to however do not free DECL_STRUCT_FUNCTION because this
2892 structure is shared in between newdecl and oldecl. */
2893 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2894 DECL_STRUCT_FUNCTION (newdecl) = NULL;
2895 if (VAR_OR_FUNCTION_DECL_P (newdecl))
2896 {
2897 struct symtab_node *snode = symtab_node::get (newdecl);
2898 if (snode)
2899 snode->remove ();
2900 }
2901
2902 if (TREE_CODE (olddecl) == FUNCTION_DECL)
2903 {
2904 tree clone;
2905 FOR_EACH_CLONE (clone, olddecl)
2906 {
2907 DECL_ATTRIBUTES (clone) = DECL_ATTRIBUTES (olddecl);
2908 DECL_PRESERVE_P (clone) |= DECL_PRESERVE_P (olddecl);
2909 }
2910 }
2911
2912 /* Remove the associated constraints for newdecl, if any, before
2913 reclaiming memory. */
2914 if (flag_concepts)
2915 remove_constraints (newdecl);
2916
2917 ggc_free (newdecl);
2918
2919 return olddecl;
2920 }
2921
2922 /* Return zero if the declaration NEWDECL is valid
2923 when the declaration OLDDECL (assumed to be for the same name)
2924 has already been seen.
2925 Otherwise return an error message format string with a %s
2926 where the identifier should go. */
2927
2928 static const char *
redeclaration_error_message(tree newdecl,tree olddecl)2929 redeclaration_error_message (tree newdecl, tree olddecl)
2930 {
2931 if (TREE_CODE (newdecl) == TYPE_DECL)
2932 {
2933 /* Because C++ can put things into name space for free,
2934 constructs like "typedef struct foo { ... } foo"
2935 would look like an erroneous redeclaration. */
2936 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
2937 return NULL;
2938 else
2939 return G_("redefinition of %q#D");
2940 }
2941 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2942 {
2943 /* If this is a pure function, its olddecl will actually be
2944 the original initialization to `0' (which we force to call
2945 abort()). Don't complain about redefinition in this case. */
2946 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
2947 && DECL_INITIAL (olddecl) == NULL_TREE)
2948 return NULL;
2949
2950 /* If both functions come from different namespaces, this is not
2951 a redeclaration - this is a conflict with a used function. */
2952 if (DECL_NAMESPACE_SCOPE_P (olddecl)
2953 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
2954 && ! decls_match (olddecl, newdecl))
2955 return G_("%qD conflicts with used function");
2956
2957 /* We'll complain about linkage mismatches in
2958 warn_extern_redeclared_static. */
2959
2960 /* Defining the same name twice is no good. */
2961 if (decl_defined_p (olddecl)
2962 && decl_defined_p (newdecl))
2963 {
2964 if (DECL_NAME (olddecl) == NULL_TREE)
2965 return G_("%q#D not declared in class");
2966 else if (!GNU_INLINE_P (olddecl)
2967 || GNU_INLINE_P (newdecl))
2968 return G_("redefinition of %q#D");
2969 }
2970
2971 if (DECL_DECLARED_INLINE_P (olddecl) && DECL_DECLARED_INLINE_P (newdecl))
2972 {
2973 bool olda = GNU_INLINE_P (olddecl);
2974 bool newa = GNU_INLINE_P (newdecl);
2975
2976 if (olda != newa)
2977 {
2978 if (newa)
2979 return G_("%q+D redeclared inline with "
2980 "%<gnu_inline%> attribute");
2981 else
2982 return G_("%q+D redeclared inline without "
2983 "%<gnu_inline%> attribute");
2984 }
2985 }
2986
2987 /* [class.compare.default]: A definition of a comparison operator as
2988 defaulted that appears in a class shall be the first declaration of
2989 that function. */
2990 special_function_kind sfk = special_function_p (olddecl);
2991 if (sfk == sfk_comparison && DECL_DEFAULTED_FN (newdecl))
2992 return G_("comparison operator %q+D defaulted after "
2993 "its first declaration");
2994
2995 check_abi_tag_redeclaration
2996 (olddecl, lookup_attribute ("abi_tag", DECL_ATTRIBUTES (olddecl)),
2997 lookup_attribute ("abi_tag", DECL_ATTRIBUTES (newdecl)));
2998
2999 return NULL;
3000 }
3001 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
3002 {
3003 tree nt, ot;
3004
3005 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == CONCEPT_DECL)
3006 return G_("redefinition of %q#D");
3007
3008 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL)
3009 return redeclaration_error_message (DECL_TEMPLATE_RESULT (newdecl),
3010 DECL_TEMPLATE_RESULT (olddecl));
3011
3012 if (DECL_TEMPLATE_RESULT (newdecl) == DECL_TEMPLATE_RESULT (olddecl))
3013 return NULL;
3014
3015 nt = DECL_TEMPLATE_RESULT (newdecl);
3016 if (DECL_TEMPLATE_INFO (nt))
3017 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
3018 ot = DECL_TEMPLATE_RESULT (olddecl);
3019 if (DECL_TEMPLATE_INFO (ot))
3020 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
3021 if (DECL_INITIAL (nt) && DECL_INITIAL (ot)
3022 && (!GNU_INLINE_P (ot) || GNU_INLINE_P (nt)))
3023 return G_("redefinition of %q#D");
3024
3025 if (DECL_DECLARED_INLINE_P (ot) && DECL_DECLARED_INLINE_P (nt))
3026 {
3027 bool olda = GNU_INLINE_P (ot);
3028 bool newa = GNU_INLINE_P (nt);
3029
3030 if (olda != newa)
3031 {
3032 if (newa)
3033 return G_("%q+D redeclared inline with "
3034 "%<gnu_inline%> attribute");
3035 else
3036 return G_("%q+D redeclared inline without "
3037 "%<gnu_inline%> attribute");
3038 }
3039 }
3040
3041 /* Core issue #226 (C++0x):
3042
3043 If a friend function template declaration specifies a
3044 default template-argument, that declaration shall be a
3045 definition and shall be the only declaration of the
3046 function template in the translation unit. */
3047 if ((cxx_dialect != cxx98)
3048 && TREE_CODE (ot) == FUNCTION_DECL && DECL_FRIEND_P (ot)
3049 && !check_default_tmpl_args (nt, DECL_TEMPLATE_PARMS (newdecl),
3050 /*is_primary=*/true,
3051 /*is_partial=*/false,
3052 /*is_friend_decl=*/2))
3053 return G_("redeclaration of friend %q#D "
3054 "may not have default template arguments");
3055
3056 return NULL;
3057 }
3058 else if (VAR_P (newdecl)
3059 && CP_DECL_THREAD_LOCAL_P (newdecl) != CP_DECL_THREAD_LOCAL_P (olddecl)
3060 && (! DECL_LANG_SPECIFIC (olddecl)
3061 || ! CP_DECL_THREADPRIVATE_P (olddecl)
3062 || CP_DECL_THREAD_LOCAL_P (newdecl)))
3063 {
3064 /* Only variables can be thread-local, and all declarations must
3065 agree on this property. */
3066 if (CP_DECL_THREAD_LOCAL_P (newdecl))
3067 return G_("thread-local declaration of %q#D follows "
3068 "non-thread-local declaration");
3069 else
3070 return G_("non-thread-local declaration of %q#D follows "
3071 "thread-local declaration");
3072 }
3073 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
3074 {
3075 /* The objects have been declared at namespace scope. If either
3076 is a member of an anonymous union, then this is an invalid
3077 redeclaration. For example:
3078
3079 int i;
3080 union { int i; };
3081
3082 is invalid. */
3083 if ((VAR_P (newdecl) && DECL_ANON_UNION_VAR_P (newdecl))
3084 || (VAR_P (olddecl) && DECL_ANON_UNION_VAR_P (olddecl)))
3085 return G_("redeclaration of %q#D");
3086 /* If at least one declaration is a reference, there is no
3087 conflict. For example:
3088
3089 int i = 3;
3090 extern int i;
3091
3092 is valid. */
3093 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
3094 return NULL;
3095
3096 /* Static data member declared outside a class definition
3097 if the variable is defined within the class with constexpr
3098 specifier is declaration rather than definition (and
3099 deprecated). */
3100 if (cxx_dialect >= cxx17
3101 && VAR_P (olddecl)
3102 && DECL_CLASS_SCOPE_P (olddecl)
3103 && DECL_DECLARED_CONSTEXPR_P (olddecl)
3104 && !DECL_INITIAL (newdecl))
3105 {
3106 DECL_EXTERNAL (newdecl) = 1;
3107 /* For now, only warn with explicit -Wdeprecated. */
3108 if (global_options_set.x_warn_deprecated)
3109 {
3110 auto_diagnostic_group d;
3111 if (warning_at (DECL_SOURCE_LOCATION (newdecl), OPT_Wdeprecated,
3112 "redundant redeclaration of %<constexpr%> "
3113 "static data member %qD", newdecl))
3114 inform (DECL_SOURCE_LOCATION (olddecl),
3115 "previous declaration of %qD", olddecl);
3116 }
3117 return NULL;
3118 }
3119
3120 /* Reject two definitions. */
3121 return G_("redefinition of %q#D");
3122 }
3123 else
3124 {
3125 /* Objects declared with block scope: */
3126 /* Reject two definitions, and reject a definition
3127 together with an external reference. */
3128 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
3129 return G_("redeclaration of %q#D");
3130 return NULL;
3131 }
3132 }
3133
3134
3135 /* Hash and equality functions for the named_label table. */
3136
3137 hashval_t
hash(const value_type entry)3138 named_label_hash::hash (const value_type entry)
3139 {
3140 return IDENTIFIER_HASH_VALUE (entry->name);
3141 }
3142
3143 bool
equal(const value_type entry,compare_type name)3144 named_label_hash::equal (const value_type entry, compare_type name)
3145 {
3146 return name == entry->name;
3147 }
3148
3149 /* Look for a label named ID in the current function. If one cannot
3150 be found, create one. Return the named_label_entry, or NULL on
3151 failure. */
3152
3153 static named_label_entry *
lookup_label_1(tree id,bool making_local_p)3154 lookup_label_1 (tree id, bool making_local_p)
3155 {
3156 /* You can't use labels at global scope. */
3157 if (current_function_decl == NULL_TREE)
3158 {
3159 error ("label %qE referenced outside of any function", id);
3160 return NULL;
3161 }
3162
3163 if (!named_labels)
3164 named_labels = hash_table<named_label_hash>::create_ggc (13);
3165
3166 hashval_t hash = IDENTIFIER_HASH_VALUE (id);
3167 named_label_entry **slot
3168 = named_labels->find_slot_with_hash (id, hash, INSERT);
3169 named_label_entry *old = *slot;
3170
3171 if (old && old->label_decl)
3172 {
3173 if (!making_local_p)
3174 return old;
3175
3176 if (old->binding_level == current_binding_level)
3177 {
3178 error ("local label %qE conflicts with existing label", id);
3179 inform (DECL_SOURCE_LOCATION (old->label_decl), "previous label");
3180 return NULL;
3181 }
3182 }
3183
3184 /* We are making a new decl, create or reuse the named_label_entry */
3185 named_label_entry *ent = NULL;
3186 if (old && !old->label_decl)
3187 ent = old;
3188 else
3189 {
3190 ent = ggc_cleared_alloc<named_label_entry> ();
3191 ent->name = id;
3192 ent->outer = old;
3193 *slot = ent;
3194 }
3195
3196 /* Now create the LABEL_DECL. */
3197 tree decl = build_decl (input_location, LABEL_DECL, id, void_type_node);
3198
3199 DECL_CONTEXT (decl) = current_function_decl;
3200 SET_DECL_MODE (decl, VOIDmode);
3201 if (making_local_p)
3202 {
3203 C_DECLARED_LABEL_FLAG (decl) = true;
3204 DECL_CHAIN (decl) = current_binding_level->names;
3205 current_binding_level->names = decl;
3206 }
3207
3208 ent->label_decl = decl;
3209
3210 return ent;
3211 }
3212
3213 /* Wrapper for lookup_label_1. */
3214
3215 tree
lookup_label(tree id)3216 lookup_label (tree id)
3217 {
3218 bool subtime = timevar_cond_start (TV_NAME_LOOKUP);
3219 named_label_entry *ent = lookup_label_1 (id, false);
3220 timevar_cond_stop (TV_NAME_LOOKUP, subtime);
3221 return ent ? ent->label_decl : NULL_TREE;
3222 }
3223
3224 tree
declare_local_label(tree id)3225 declare_local_label (tree id)
3226 {
3227 bool subtime = timevar_cond_start (TV_NAME_LOOKUP);
3228 named_label_entry *ent = lookup_label_1 (id, true);
3229 timevar_cond_stop (TV_NAME_LOOKUP, subtime);
3230 return ent ? ent->label_decl : NULL_TREE;
3231 }
3232
3233 /* Returns nonzero if it is ill-formed to jump past the declaration of
3234 DECL. Returns 2 if it's also a real problem. */
3235
3236 static int
decl_jump_unsafe(tree decl)3237 decl_jump_unsafe (tree decl)
3238 {
3239 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
3240 with automatic storage duration is not in scope to a point where it is
3241 in scope is ill-formed unless the variable has scalar type, class type
3242 with a trivial default constructor and a trivial destructor, a
3243 cv-qualified version of one of these types, or an array of one of the
3244 preceding types and is declared without an initializer (8.5). */
3245 tree type = TREE_TYPE (decl);
3246
3247 if (!VAR_P (decl) || TREE_STATIC (decl)
3248 || type == error_mark_node)
3249 return 0;
3250
3251 if (DECL_NONTRIVIALLY_INITIALIZED_P (decl)
3252 || variably_modified_type_p (type, NULL_TREE))
3253 return 2;
3254
3255 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
3256 return 1;
3257
3258 return 0;
3259 }
3260
3261 /* A subroutine of check_previous_goto_1 and check_goto to identify a branch
3262 to the user. */
3263
3264 static bool
identify_goto(tree decl,location_t loc,const location_t * locus,diagnostic_t diag_kind)3265 identify_goto (tree decl, location_t loc, const location_t *locus,
3266 diagnostic_t diag_kind)
3267 {
3268 bool complained
3269 = emit_diagnostic (diag_kind, loc, 0,
3270 decl ? N_("jump to label %qD")
3271 : N_("jump to case label"), decl);
3272 if (complained && locus)
3273 inform (*locus, " from here");
3274 return complained;
3275 }
3276
3277 /* Check that a single previously seen jump to a newly defined label
3278 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
3279 the jump context; NAMES are the names in scope in LEVEL at the jump
3280 context; LOCUS is the source position of the jump or 0. Returns
3281 true if all is well. */
3282
3283 static bool
check_previous_goto_1(tree decl,cp_binding_level * level,tree names,bool exited_omp,const location_t * locus)3284 check_previous_goto_1 (tree decl, cp_binding_level* level, tree names,
3285 bool exited_omp, const location_t *locus)
3286 {
3287 cp_binding_level *b;
3288 bool complained = false;
3289 int identified = 0;
3290 bool saw_eh = false, saw_omp = false, saw_tm = false, saw_cxif = false;
3291
3292 if (exited_omp)
3293 {
3294 complained = identify_goto (decl, input_location, locus, DK_ERROR);
3295 if (complained)
3296 inform (input_location, " exits OpenMP structured block");
3297 saw_omp = true;
3298 identified = 2;
3299 }
3300
3301 for (b = current_binding_level; b ; b = b->level_chain)
3302 {
3303 tree new_decls, old_decls = (b == level ? names : NULL_TREE);
3304
3305 for (new_decls = b->names; new_decls != old_decls;
3306 new_decls = (DECL_P (new_decls) ? DECL_CHAIN (new_decls)
3307 : TREE_CHAIN (new_decls)))
3308 {
3309 int problem = decl_jump_unsafe (new_decls);
3310 if (! problem)
3311 continue;
3312
3313 if (!identified)
3314 {
3315 complained = identify_goto (decl, input_location, locus,
3316 problem > 1
3317 ? DK_ERROR : DK_PERMERROR);
3318 identified = 1;
3319 }
3320 if (complained)
3321 {
3322 if (problem > 1)
3323 inform (DECL_SOURCE_LOCATION (new_decls),
3324 " crosses initialization of %q#D", new_decls);
3325 else
3326 inform (DECL_SOURCE_LOCATION (new_decls),
3327 " enters scope of %q#D, which has "
3328 "non-trivial destructor", new_decls);
3329 }
3330 }
3331
3332 if (b == level)
3333 break;
3334
3335 const char *inf = NULL;
3336 location_t loc = input_location;
3337 switch (b->kind)
3338 {
3339 case sk_try:
3340 if (!saw_eh)
3341 inf = G_(" enters %<try%> block");
3342 saw_eh = true;
3343 break;
3344
3345 case sk_catch:
3346 if (!saw_eh)
3347 inf = G_(" enters %<catch%> block");
3348 saw_eh = true;
3349 break;
3350
3351 case sk_omp:
3352 if (!saw_omp)
3353 inf = G_(" enters OpenMP structured block");
3354 saw_omp = true;
3355 break;
3356
3357 case sk_transaction:
3358 if (!saw_tm)
3359 inf = G_(" enters synchronized or atomic statement");
3360 saw_tm = true;
3361 break;
3362
3363 case sk_block:
3364 if (!saw_cxif && level_for_constexpr_if (b->level_chain))
3365 {
3366 inf = G_(" enters %<constexpr if%> statement");
3367 loc = EXPR_LOCATION (b->level_chain->this_entity);
3368 saw_cxif = true;
3369 }
3370 break;
3371
3372 default:
3373 break;
3374 }
3375
3376 if (inf)
3377 {
3378 if (identified < 2)
3379 complained = identify_goto (decl, input_location, locus, DK_ERROR);
3380 identified = 2;
3381 if (complained)
3382 inform (loc, inf);
3383 }
3384 }
3385
3386 return !identified;
3387 }
3388
3389 static void
check_previous_goto(tree decl,struct named_label_use_entry * use)3390 check_previous_goto (tree decl, struct named_label_use_entry *use)
3391 {
3392 check_previous_goto_1 (decl, use->binding_level,
3393 use->names_in_scope, use->in_omp_scope,
3394 &use->o_goto_locus);
3395 }
3396
3397 static bool
check_switch_goto(cp_binding_level * level)3398 check_switch_goto (cp_binding_level* level)
3399 {
3400 return check_previous_goto_1 (NULL_TREE, level, level->names, false, NULL);
3401 }
3402
3403 /* Check that a new jump to a label DECL is OK. Called by
3404 finish_goto_stmt. */
3405
3406 void
check_goto(tree decl)3407 check_goto (tree decl)
3408 {
3409 /* We can't know where a computed goto is jumping.
3410 So we assume that it's OK. */
3411 if (TREE_CODE (decl) != LABEL_DECL)
3412 return;
3413
3414 /* We didn't record any information about this label when we created it,
3415 and there's not much point since it's trivial to analyze as a return. */
3416 if (decl == cdtor_label)
3417 return;
3418
3419 hashval_t hash = IDENTIFIER_HASH_VALUE (DECL_NAME (decl));
3420 named_label_entry **slot
3421 = named_labels->find_slot_with_hash (DECL_NAME (decl), hash, NO_INSERT);
3422 named_label_entry *ent = *slot;
3423
3424 /* If the label hasn't been defined yet, defer checking. */
3425 if (! DECL_INITIAL (decl))
3426 {
3427 /* Don't bother creating another use if the last goto had the
3428 same data, and will therefore create the same set of errors. */
3429 if (ent->uses
3430 && ent->uses->names_in_scope == current_binding_level->names)
3431 return;
3432
3433 named_label_use_entry *new_use
3434 = ggc_alloc<named_label_use_entry> ();
3435 new_use->binding_level = current_binding_level;
3436 new_use->names_in_scope = current_binding_level->names;
3437 new_use->o_goto_locus = input_location;
3438 new_use->in_omp_scope = false;
3439
3440 new_use->next = ent->uses;
3441 ent->uses = new_use;
3442 return;
3443 }
3444
3445 bool saw_catch = false, complained = false;
3446 int identified = 0;
3447 tree bad;
3448 unsigned ix;
3449
3450 if (ent->in_try_scope || ent->in_catch_scope || ent->in_transaction_scope
3451 || ent->in_constexpr_if
3452 || ent->in_omp_scope || !vec_safe_is_empty (ent->bad_decls))
3453 {
3454 diagnostic_t diag_kind = DK_PERMERROR;
3455 if (ent->in_try_scope || ent->in_catch_scope || ent->in_constexpr_if
3456 || ent->in_transaction_scope || ent->in_omp_scope)
3457 diag_kind = DK_ERROR;
3458 complained = identify_goto (decl, DECL_SOURCE_LOCATION (decl),
3459 &input_location, diag_kind);
3460 identified = 1 + (diag_kind == DK_ERROR);
3461 }
3462
3463 FOR_EACH_VEC_SAFE_ELT (ent->bad_decls, ix, bad)
3464 {
3465 int u = decl_jump_unsafe (bad);
3466
3467 if (u > 1 && DECL_ARTIFICIAL (bad))
3468 {
3469 /* Can't skip init of __exception_info. */
3470 if (identified == 1)
3471 {
3472 complained = identify_goto (decl, DECL_SOURCE_LOCATION (decl),
3473 &input_location, DK_ERROR);
3474 identified = 2;
3475 }
3476 if (complained)
3477 inform (DECL_SOURCE_LOCATION (bad), " enters %<catch%> block");
3478 saw_catch = true;
3479 }
3480 else if (complained)
3481 {
3482 if (u > 1)
3483 inform (DECL_SOURCE_LOCATION (bad),
3484 " skips initialization of %q#D", bad);
3485 else
3486 inform (DECL_SOURCE_LOCATION (bad),
3487 " enters scope of %q#D which has "
3488 "non-trivial destructor", bad);
3489 }
3490 }
3491
3492 if (complained)
3493 {
3494 if (ent->in_try_scope)
3495 inform (input_location, " enters %<try%> block");
3496 else if (ent->in_catch_scope && !saw_catch)
3497 inform (input_location, " enters %<catch%> block");
3498 else if (ent->in_transaction_scope)
3499 inform (input_location, " enters synchronized or atomic statement");
3500 else if (ent->in_constexpr_if)
3501 inform (input_location, " enters %<constexpr if%> statement");
3502 }
3503
3504 if (ent->in_omp_scope)
3505 {
3506 if (complained)
3507 inform (input_location, " enters OpenMP structured block");
3508 }
3509 else if (flag_openmp)
3510 for (cp_binding_level *b = current_binding_level; b ; b = b->level_chain)
3511 {
3512 if (b == ent->binding_level)
3513 break;
3514 if (b->kind == sk_omp)
3515 {
3516 if (identified < 2)
3517 {
3518 complained = identify_goto (decl,
3519 DECL_SOURCE_LOCATION (decl),
3520 &input_location, DK_ERROR);
3521 identified = 2;
3522 }
3523 if (complained)
3524 inform (input_location, " exits OpenMP structured block");
3525 break;
3526 }
3527 }
3528 }
3529
3530 /* Check that a return is ok wrt OpenMP structured blocks.
3531 Called by finish_return_stmt. Returns true if all is well. */
3532
3533 bool
check_omp_return(void)3534 check_omp_return (void)
3535 {
3536 for (cp_binding_level *b = current_binding_level; b ; b = b->level_chain)
3537 if (b->kind == sk_omp)
3538 {
3539 error ("invalid exit from OpenMP structured block");
3540 return false;
3541 }
3542 else if (b->kind == sk_function_parms)
3543 break;
3544 return true;
3545 }
3546
3547 /* Define a label, specifying the location in the source file.
3548 Return the LABEL_DECL node for the label. */
3549
3550 static tree
define_label_1(location_t location,tree name)3551 define_label_1 (location_t location, tree name)
3552 {
3553 /* After labels, make any new cleanups in the function go into their
3554 own new (temporary) binding contour. */
3555 for (cp_binding_level *p = current_binding_level;
3556 p->kind != sk_function_parms;
3557 p = p->level_chain)
3558 p->more_cleanups_ok = 0;
3559
3560 named_label_entry *ent = lookup_label_1 (name, false);
3561 tree decl = ent->label_decl;
3562
3563 if (DECL_INITIAL (decl) != NULL_TREE)
3564 {
3565 error ("duplicate label %qD", decl);
3566 return error_mark_node;
3567 }
3568 else
3569 {
3570 /* Mark label as having been defined. */
3571 DECL_INITIAL (decl) = error_mark_node;
3572 /* Say where in the source. */
3573 DECL_SOURCE_LOCATION (decl) = location;
3574
3575 ent->binding_level = current_binding_level;
3576 ent->names_in_scope = current_binding_level->names;
3577
3578 for (named_label_use_entry *use = ent->uses; use; use = use->next)
3579 check_previous_goto (decl, use);
3580 ent->uses = NULL;
3581 }
3582
3583 return decl;
3584 }
3585
3586 /* Wrapper for define_label_1. */
3587
3588 tree
define_label(location_t location,tree name)3589 define_label (location_t location, tree name)
3590 {
3591 bool running = timevar_cond_start (TV_NAME_LOOKUP);
3592 tree ret = define_label_1 (location, name);
3593 timevar_cond_stop (TV_NAME_LOOKUP, running);
3594 return ret;
3595 }
3596
3597
3598 struct cp_switch
3599 {
3600 cp_binding_level *level;
3601 struct cp_switch *next;
3602 /* The SWITCH_STMT being built. */
3603 tree switch_stmt;
3604 /* A splay-tree mapping the low element of a case range to the high
3605 element, or NULL_TREE if there is no high element. Used to
3606 determine whether or not a new case label duplicates an old case
3607 label. We need a tree, rather than simply a hash table, because
3608 of the GNU case range extension. */
3609 splay_tree cases;
3610 /* Remember whether a default: case label has been seen. */
3611 bool has_default_p;
3612 /* Remember whether a BREAK_STMT has been seen in this SWITCH_STMT. */
3613 bool break_stmt_seen_p;
3614 /* Set if inside of {FOR,DO,WHILE}_BODY nested inside of a switch,
3615 where BREAK_STMT doesn't belong to the SWITCH_STMT. */
3616 bool in_loop_body_p;
3617 };
3618
3619 /* A stack of the currently active switch statements. The innermost
3620 switch statement is on the top of the stack. There is no need to
3621 mark the stack for garbage collection because it is only active
3622 during the processing of the body of a function, and we never
3623 collect at that point. */
3624
3625 static struct cp_switch *switch_stack;
3626
3627 /* Called right after a switch-statement condition is parsed.
3628 SWITCH_STMT is the switch statement being parsed. */
3629
3630 void
push_switch(tree switch_stmt)3631 push_switch (tree switch_stmt)
3632 {
3633 struct cp_switch *p = XNEW (struct cp_switch);
3634 p->level = current_binding_level;
3635 p->next = switch_stack;
3636 p->switch_stmt = switch_stmt;
3637 p->cases = splay_tree_new (case_compare, NULL, NULL);
3638 p->has_default_p = false;
3639 p->break_stmt_seen_p = false;
3640 p->in_loop_body_p = false;
3641 switch_stack = p;
3642 }
3643
3644 void
pop_switch(void)3645 pop_switch (void)
3646 {
3647 struct cp_switch *cs = switch_stack;
3648
3649 /* Emit warnings as needed. */
3650 location_t switch_location = cp_expr_loc_or_input_loc (cs->switch_stmt);
3651 tree cond = SWITCH_STMT_COND (cs->switch_stmt);
3652 const bool bool_cond_p
3653 = (SWITCH_STMT_TYPE (cs->switch_stmt)
3654 && TREE_CODE (SWITCH_STMT_TYPE (cs->switch_stmt)) == BOOLEAN_TYPE);
3655 if (!processing_template_decl)
3656 c_do_switch_warnings (cs->cases, switch_location,
3657 SWITCH_STMT_TYPE (cs->switch_stmt), cond,
3658 bool_cond_p);
3659
3660 /* For the benefit of block_may_fallthru remember if the switch body
3661 case labels cover all possible values and if there are break; stmts. */
3662 if (cs->has_default_p
3663 || (!processing_template_decl
3664 && c_switch_covers_all_cases_p (cs->cases,
3665 SWITCH_STMT_TYPE (cs->switch_stmt))))
3666 SWITCH_STMT_ALL_CASES_P (cs->switch_stmt) = 1;
3667 if (!cs->break_stmt_seen_p)
3668 SWITCH_STMT_NO_BREAK_P (cs->switch_stmt) = 1;
3669 /* Now that we're done with the switch warnings, set the switch type
3670 to the type of the condition if the index type was of scoped enum type.
3671 (Such types don't participate in the integer promotions.) We do this
3672 because of bit-fields whose declared type is a scoped enum type:
3673 gimplification will use the lowered index type, but convert the
3674 case values to SWITCH_STMT_TYPE, which would have been the declared type
3675 and verify_gimple_switch doesn't accept that. */
3676 if (is_bitfield_expr_with_lowered_type (cond))
3677 SWITCH_STMT_TYPE (cs->switch_stmt) = TREE_TYPE (cond);
3678 gcc_assert (!cs->in_loop_body_p);
3679 splay_tree_delete (cs->cases);
3680 switch_stack = switch_stack->next;
3681 free (cs);
3682 }
3683
3684 /* Note that a BREAK_STMT is about to be added. If it is inside of
3685 a SWITCH_STMT and not inside of a loop body inside of it, note
3686 in switch_stack we've seen a BREAK_STMT. */
3687
3688 void
note_break_stmt(void)3689 note_break_stmt (void)
3690 {
3691 if (switch_stack && !switch_stack->in_loop_body_p)
3692 switch_stack->break_stmt_seen_p = true;
3693 }
3694
3695 /* Note the start of processing of an iteration statement's body.
3696 The note_break_stmt function will do nothing while processing it.
3697 Return a flag that should be passed to note_iteration_stmt_body_end. */
3698
3699 bool
note_iteration_stmt_body_start(void)3700 note_iteration_stmt_body_start (void)
3701 {
3702 if (!switch_stack)
3703 return false;
3704 bool ret = switch_stack->in_loop_body_p;
3705 switch_stack->in_loop_body_p = true;
3706 return ret;
3707 }
3708
3709 /* Note the end of processing of an iteration statement's body. */
3710
3711 void
note_iteration_stmt_body_end(bool prev)3712 note_iteration_stmt_body_end (bool prev)
3713 {
3714 if (switch_stack)
3715 switch_stack->in_loop_body_p = prev;
3716 }
3717
3718 /* Convert a case constant VALUE in a switch to the type TYPE of the switch
3719 condition. Note that if TYPE and VALUE are already integral we don't
3720 really do the conversion because the language-independent
3721 warning/optimization code will work better that way. */
3722
3723 static tree
case_conversion(tree type,tree value)3724 case_conversion (tree type, tree value)
3725 {
3726 if (value == NULL_TREE)
3727 return value;
3728
3729 value = mark_rvalue_use (value);
3730
3731 if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
3732 type = type_promotes_to (type);
3733
3734 tree ovalue = value;
3735 /* The constant-expression VALUE shall be a converted constant expression
3736 of the adjusted type of the switch condition, which doesn't allow
3737 narrowing conversions. */
3738 value = build_converted_constant_expr (type, value, tf_warning_or_error);
3739
3740 if (cxx_dialect >= cxx11
3741 && (SCOPED_ENUM_P (type)
3742 || !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (ovalue))))
3743 /* Use the converted value. */;
3744 else
3745 /* The already integral case. */
3746 value = ovalue;
3747
3748 return cxx_constant_value (value);
3749 }
3750
3751 /* Note that we've seen a definition of a case label, and complain if this
3752 is a bad place for one. */
3753
3754 tree
finish_case_label(location_t loc,tree low_value,tree high_value)3755 finish_case_label (location_t loc, tree low_value, tree high_value)
3756 {
3757 tree cond, r;
3758 cp_binding_level *p;
3759 tree type;
3760
3761 if (low_value == NULL_TREE && high_value == NULL_TREE)
3762 switch_stack->has_default_p = true;
3763
3764 if (processing_template_decl)
3765 {
3766 tree label;
3767
3768 /* For templates, just add the case label; we'll do semantic
3769 analysis at instantiation-time. */
3770 label = build_decl (loc, LABEL_DECL, NULL_TREE, void_type_node);
3771 return add_stmt (build_case_label (low_value, high_value, label));
3772 }
3773
3774 /* Find the condition on which this switch statement depends. */
3775 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
3776 if (cond && TREE_CODE (cond) == TREE_LIST)
3777 cond = TREE_VALUE (cond);
3778
3779 if (!check_switch_goto (switch_stack->level))
3780 return error_mark_node;
3781
3782 type = SWITCH_STMT_TYPE (switch_stack->switch_stmt);
3783 if (type == error_mark_node)
3784 return error_mark_node;
3785
3786 low_value = case_conversion (type, low_value);
3787 high_value = case_conversion (type, high_value);
3788
3789 r = c_add_case_label (loc, switch_stack->cases, cond, low_value, high_value);
3790
3791 /* After labels, make any new cleanups in the function go into their
3792 own new (temporary) binding contour. */
3793 for (p = current_binding_level;
3794 p->kind != sk_function_parms;
3795 p = p->level_chain)
3796 p->more_cleanups_ok = 0;
3797
3798 return r;
3799 }
3800
3801 struct typename_info {
3802 tree scope;
3803 tree name;
3804 tree template_id;
3805 bool enum_p;
3806 bool class_p;
3807 };
3808
3809 struct typename_hasher : ggc_ptr_hash<tree_node>
3810 {
3811 typedef typename_info *compare_type;
3812
3813 /* Hash a TYPENAME_TYPE. */
3814
3815 static hashval_t
hashtypename_hasher3816 hash (tree t)
3817 {
3818 hashval_t hash;
3819
3820 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
3821 ^ htab_hash_pointer (TYPE_IDENTIFIER (t)));
3822
3823 return hash;
3824 }
3825
3826 /* Compare two TYPENAME_TYPEs. */
3827
3828 static bool
equaltypename_hasher3829 equal (tree t1, const typename_info *t2)
3830 {
3831 return (TYPE_IDENTIFIER (t1) == t2->name
3832 && TYPE_CONTEXT (t1) == t2->scope
3833 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
3834 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
3835 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
3836 }
3837 };
3838
3839 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
3840 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
3841
3842 Returns the new TYPENAME_TYPE. */
3843
3844 static GTY (()) hash_table<typename_hasher> *typename_htab;
3845
3846 tree
build_typename_type(tree context,tree name,tree fullname,enum tag_types tag_type)3847 build_typename_type (tree context, tree name, tree fullname,
3848 enum tag_types tag_type)
3849 {
3850 tree t;
3851 tree d;
3852 typename_info ti;
3853 tree *e;
3854 hashval_t hash;
3855
3856 if (typename_htab == NULL)
3857 typename_htab = hash_table<typename_hasher>::create_ggc (61);
3858
3859 ti.scope = FROB_CONTEXT (context);
3860 ti.name = name;
3861 ti.template_id = fullname;
3862 ti.enum_p = tag_type == enum_type;
3863 ti.class_p = (tag_type == class_type
3864 || tag_type == record_type
3865 || tag_type == union_type);
3866 hash = (htab_hash_pointer (ti.scope)
3867 ^ htab_hash_pointer (ti.name));
3868
3869 /* See if we already have this type. */
3870 e = typename_htab->find_slot_with_hash (&ti, hash, INSERT);
3871 if (*e)
3872 t = *e;
3873 else
3874 {
3875 /* Build the TYPENAME_TYPE. */
3876 t = cxx_make_type (TYPENAME_TYPE);
3877 TYPE_CONTEXT (t) = ti.scope;
3878 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
3879 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
3880 TYPENAME_IS_CLASS_P (t) = ti.class_p;
3881
3882 /* Build the corresponding TYPE_DECL. */
3883 d = build_decl (input_location, TYPE_DECL, name, t);
3884 TYPE_NAME (TREE_TYPE (d)) = d;
3885 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3886 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3887 DECL_ARTIFICIAL (d) = 1;
3888
3889 /* Store it in the hash table. */
3890 *e = t;
3891
3892 /* TYPENAME_TYPEs must always be compared structurally, because
3893 they may or may not resolve down to another type depending on
3894 the currently open classes. */
3895 SET_TYPE_STRUCTURAL_EQUALITY (t);
3896 }
3897
3898 return t;
3899 }
3900
3901 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
3902 provided to name the type. Returns an appropriate type, unless an
3903 error occurs, in which case error_mark_node is returned. If we
3904 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
3905 return that, rather than the _TYPE it corresponds to, in other
3906 cases we look through the type decl. If TF_ERROR is set, complain
3907 about errors, otherwise be quiet. */
3908
3909 tree
make_typename_type(tree context,tree name,enum tag_types tag_type,tsubst_flags_t complain)3910 make_typename_type (tree context, tree name, enum tag_types tag_type,
3911 tsubst_flags_t complain)
3912 {
3913 tree fullname;
3914 tree t;
3915 bool want_template;
3916
3917 if (name == error_mark_node
3918 || context == NULL_TREE
3919 || context == error_mark_node)
3920 return error_mark_node;
3921
3922 if (TYPE_P (name))
3923 {
3924 if (!(TYPE_LANG_SPECIFIC (name)
3925 && (CLASSTYPE_IS_TEMPLATE (name)
3926 || CLASSTYPE_USE_TEMPLATE (name))))
3927 name = TYPE_IDENTIFIER (name);
3928 else
3929 /* Create a TEMPLATE_ID_EXPR for the type. */
3930 name = build_nt (TEMPLATE_ID_EXPR,
3931 CLASSTYPE_TI_TEMPLATE (name),
3932 CLASSTYPE_TI_ARGS (name));
3933 }
3934 else if (TREE_CODE (name) == TYPE_DECL)
3935 name = DECL_NAME (name);
3936
3937 fullname = name;
3938
3939 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
3940 {
3941 name = TREE_OPERAND (name, 0);
3942 if (DECL_TYPE_TEMPLATE_P (name))
3943 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
3944 if (TREE_CODE (name) != IDENTIFIER_NODE)
3945 {
3946 if (complain & tf_error)
3947 error ("%qD is not a type", name);
3948 return error_mark_node;
3949 }
3950 }
3951 if (TREE_CODE (name) == TEMPLATE_DECL)
3952 {
3953 if (complain & tf_error)
3954 error ("%qD used without template arguments", name);
3955 return error_mark_node;
3956 }
3957 gcc_assert (identifier_p (name));
3958 gcc_assert (TYPE_P (context));
3959
3960 if (TREE_CODE (context) == TYPE_PACK_EXPANSION)
3961 /* This can happen for C++17 variadic using (c++/88986). */;
3962 else if (!MAYBE_CLASS_TYPE_P (context))
3963 {
3964 if (complain & tf_error)
3965 error ("%q#T is not a class", context);
3966 return error_mark_node;
3967 }
3968
3969 /* When the CONTEXT is a dependent type, NAME could refer to a
3970 dependent base class of CONTEXT. But look inside it anyway
3971 if CONTEXT is a currently open scope, in case it refers to a
3972 member of the current instantiation or a non-dependent base;
3973 lookup will stop when we hit a dependent base. */
3974 if (!dependent_scope_p (context))
3975 /* We should only set WANT_TYPE when we're a nested typename type.
3976 Then we can give better diagnostics if we find a non-type. */
3977 t = lookup_field (context, name, 2, /*want_type=*/true);
3978 else
3979 t = NULL_TREE;
3980
3981 if ((!t || TREE_CODE (t) == TREE_LIST) && dependent_type_p (context))
3982 return build_typename_type (context, name, fullname, tag_type);
3983
3984 want_template = TREE_CODE (fullname) == TEMPLATE_ID_EXPR;
3985
3986 if (!t)
3987 {
3988 if (complain & tf_error)
3989 {
3990 if (!COMPLETE_TYPE_P (context))
3991 cxx_incomplete_type_error (NULL_TREE, context);
3992 else
3993 error (want_template ? G_("no class template named %q#T in %q#T")
3994 : G_("no type named %q#T in %q#T"), name, context);
3995 }
3996 return error_mark_node;
3997 }
3998
3999 /* Pull out the template from an injected-class-name (or multiple). */
4000 if (want_template)
4001 t = maybe_get_template_decl_from_type_decl (t);
4002
4003 if (TREE_CODE (t) == TREE_LIST)
4004 {
4005 if (complain & tf_error)
4006 {
4007 error ("lookup of %qT in %qT is ambiguous", name, context);
4008 print_candidates (t);
4009 }
4010 return error_mark_node;
4011 }
4012
4013 if (want_template && !DECL_TYPE_TEMPLATE_P (t))
4014 {
4015 if (complain & tf_error)
4016 error ("%<typename %T::%D%> names %q#T, which is not a class template",
4017 context, name, t);
4018 return error_mark_node;
4019 }
4020 if (!want_template && TREE_CODE (t) != TYPE_DECL)
4021 {
4022 if (complain & tf_error)
4023 error ("%<typename %T::%D%> names %q#T, which is not a type",
4024 context, name, t);
4025 return error_mark_node;
4026 }
4027
4028 if (!perform_or_defer_access_check (TYPE_BINFO (context), t, t, complain))
4029 return error_mark_node;
4030
4031 /* If we are currently parsing a template and if T is a typedef accessed
4032 through CONTEXT then we need to remember and check access of T at
4033 template instantiation time. */
4034 add_typedef_to_current_template_for_access_check (t, context, input_location);
4035
4036 if (want_template)
4037 return lookup_template_class (t, TREE_OPERAND (fullname, 1),
4038 NULL_TREE, context,
4039 /*entering_scope=*/0,
4040 complain | tf_user);
4041
4042 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
4043 t = TREE_TYPE (t);
4044
4045 maybe_record_typedef_use (t);
4046
4047 return t;
4048 }
4049
4050 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
4051 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
4052 in which case error_mark_node is returned.
4053
4054 If PARM_LIST is non-NULL, also make sure that the template parameter
4055 list of TEMPLATE_DECL matches.
4056
4057 If COMPLAIN zero, don't complain about any errors that occur. */
4058
4059 tree
make_unbound_class_template(tree context,tree name,tree parm_list,tsubst_flags_t complain)4060 make_unbound_class_template (tree context, tree name, tree parm_list,
4061 tsubst_flags_t complain)
4062 {
4063 tree t;
4064 tree d;
4065
4066 if (TYPE_P (name))
4067 name = TYPE_IDENTIFIER (name);
4068 else if (DECL_P (name))
4069 name = DECL_NAME (name);
4070 gcc_assert (identifier_p (name));
4071
4072 if (!dependent_type_p (context)
4073 || currently_open_class (context))
4074 {
4075 tree tmpl = NULL_TREE;
4076
4077 if (MAYBE_CLASS_TYPE_P (context))
4078 tmpl = lookup_field (context, name, 0, false);
4079
4080 if (tmpl && TREE_CODE (tmpl) == TYPE_DECL)
4081 tmpl = maybe_get_template_decl_from_type_decl (tmpl);
4082
4083 if (!tmpl || !DECL_TYPE_TEMPLATE_P (tmpl))
4084 {
4085 if (complain & tf_error)
4086 error ("no class template named %q#T in %q#T", name, context);
4087 return error_mark_node;
4088 }
4089
4090 if (parm_list
4091 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
4092 {
4093 if (complain & tf_error)
4094 {
4095 error ("template parameters do not match template %qD", tmpl);
4096 inform (DECL_SOURCE_LOCATION (tmpl),
4097 "%qD declared here", tmpl);
4098 }
4099 return error_mark_node;
4100 }
4101
4102 if (!perform_or_defer_access_check (TYPE_BINFO (context), tmpl, tmpl,
4103 complain))
4104 return error_mark_node;
4105
4106 return tmpl;
4107 }
4108
4109 /* Build the UNBOUND_CLASS_TEMPLATE. */
4110 t = cxx_make_type (UNBOUND_CLASS_TEMPLATE);
4111 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
4112 TREE_TYPE (t) = NULL_TREE;
4113 SET_TYPE_STRUCTURAL_EQUALITY (t);
4114
4115 /* Build the corresponding TEMPLATE_DECL. */
4116 d = build_decl (input_location, TEMPLATE_DECL, name, t);
4117 TYPE_NAME (TREE_TYPE (d)) = d;
4118 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
4119 DECL_CONTEXT (d) = FROB_CONTEXT (context);
4120 DECL_ARTIFICIAL (d) = 1;
4121 DECL_TEMPLATE_PARMS (d) = parm_list;
4122
4123 return t;
4124 }
4125
4126
4127
4128 /* Push the declarations of builtin types into the global namespace.
4129 RID_INDEX is the index of the builtin type in the array
4130 RID_POINTERS. NAME is the name used when looking up the builtin
4131 type. TYPE is the _TYPE node for the builtin type.
4132
4133 The calls to set_global_binding below should be
4134 eliminated. Built-in types should not be looked up name; their
4135 names are keywords that the parser can recognize. However, there
4136 is code in c-common.c that uses identifier_global_value to look up
4137 built-in types by name. */
4138
4139 void
record_builtin_type(enum rid rid_index,const char * name,tree type)4140 record_builtin_type (enum rid rid_index,
4141 const char* name,
4142 tree type)
4143 {
4144 tree decl = NULL_TREE;
4145
4146 if (name)
4147 {
4148 tree tname = get_identifier (name);
4149 tree tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, tname, type);
4150 DECL_ARTIFICIAL (tdecl) = 1;
4151 set_global_binding (tdecl);
4152 decl = tdecl;
4153 }
4154
4155 if ((int) rid_index < (int) RID_MAX)
4156 if (tree rname = ridpointers[(int) rid_index])
4157 if (!decl || DECL_NAME (decl) != rname)
4158 {
4159 tree rdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, rname, type);
4160 DECL_ARTIFICIAL (rdecl) = 1;
4161 set_global_binding (rdecl);
4162 if (!decl)
4163 decl = rdecl;
4164 }
4165
4166 if (decl)
4167 {
4168 if (!TYPE_NAME (type))
4169 TYPE_NAME (type) = decl;
4170 debug_hooks->type_decl (decl, 0);
4171 }
4172 }
4173
4174 /* Push a type into the namespace so that the back ends ignore it. */
4175
4176 static void
record_unknown_type(tree type,const char * name)4177 record_unknown_type (tree type, const char* name)
4178 {
4179 tree decl = pushdecl (build_decl (UNKNOWN_LOCATION,
4180 TYPE_DECL, get_identifier (name), type));
4181 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
4182 DECL_IGNORED_P (decl) = 1;
4183 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
4184 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
4185 SET_TYPE_ALIGN (type, 1);
4186 TYPE_USER_ALIGN (type) = 0;
4187 SET_TYPE_MODE (type, TYPE_MODE (void_type_node));
4188 }
4189
4190 /* Create all the predefined identifiers. */
4191
4192 static void
initialize_predefined_identifiers(void)4193 initialize_predefined_identifiers (void)
4194 {
4195 struct predefined_identifier
4196 {
4197 const char *name; /* Name. */
4198 tree *node; /* Node to store it in. */
4199 cp_identifier_kind kind; /* Kind of identifier. */
4200 };
4201
4202 /* A table of identifiers to create at startup. */
4203 static const predefined_identifier predefined_identifiers[] = {
4204 {"C++", &lang_name_cplusplus, cik_normal},
4205 {"C", &lang_name_c, cik_normal},
4206 /* Some of these names have a trailing space so that it is
4207 impossible for them to conflict with names written by users. */
4208 {"__ct ", &ctor_identifier, cik_ctor},
4209 {"__ct_base ", &base_ctor_identifier, cik_ctor},
4210 {"__ct_comp ", &complete_ctor_identifier, cik_ctor},
4211 {"__dt ", &dtor_identifier, cik_dtor},
4212 {"__dt_base ", &base_dtor_identifier, cik_dtor},
4213 {"__dt_comp ", &complete_dtor_identifier, cik_dtor},
4214 {"__dt_del ", &deleting_dtor_identifier, cik_dtor},
4215 {"__conv_op ", &conv_op_identifier, cik_conv_op},
4216 {"__in_chrg", &in_charge_identifier, cik_normal},
4217 {"this", &this_identifier, cik_normal},
4218 {"__delta", &delta_identifier, cik_normal},
4219 {"__pfn", &pfn_identifier, cik_normal},
4220 {"_vptr", &vptr_identifier, cik_normal},
4221 {"__vtt_parm", &vtt_parm_identifier, cik_normal},
4222 {"::", &global_identifier, cik_normal},
4223 /* The demangler expects anonymous namespaces to be called
4224 something starting with '_GLOBAL__N_'. It no longer needs
4225 to be unique to the TU. */
4226 {"_GLOBAL__N_1", &anon_identifier, cik_normal},
4227 {"auto", &auto_identifier, cik_normal},
4228 {"decltype(auto)", &decltype_auto_identifier, cik_normal},
4229 {"initializer_list", &init_list_identifier, cik_normal},
4230 {"__for_range ", &for_range__identifier, cik_normal},
4231 {"__for_begin ", &for_begin__identifier, cik_normal},
4232 {"__for_end ", &for_end__identifier, cik_normal},
4233 {"__for_range", &for_range_identifier, cik_normal},
4234 {"__for_begin", &for_begin_identifier, cik_normal},
4235 {"__for_end", &for_end_identifier, cik_normal},
4236 {"abi_tag", &abi_tag_identifier, cik_normal},
4237 {"aligned", &aligned_identifier, cik_normal},
4238 {"begin", &begin_identifier, cik_normal},
4239 {"end", &end_identifier, cik_normal},
4240 {"get", &get__identifier, cik_normal},
4241 {"gnu", &gnu_identifier, cik_normal},
4242 {"tuple_element", &tuple_element_identifier, cik_normal},
4243 {"tuple_size", &tuple_size_identifier, cik_normal},
4244 {"type", &type_identifier, cik_normal},
4245 {"value", &value_identifier, cik_normal},
4246 {"_FUN", &fun_identifier, cik_normal},
4247 {"__closure", &closure_identifier, cik_normal},
4248 {"heap uninit", &heap_uninit_identifier, cik_normal},
4249 {"heap ", &heap_identifier, cik_normal},
4250 {"heap deleted", &heap_deleted_identifier, cik_normal},
4251 {NULL, NULL, cik_normal}
4252 };
4253
4254 for (const predefined_identifier *pid = predefined_identifiers;
4255 pid->name; ++pid)
4256 {
4257 *pid->node = get_identifier (pid->name);
4258 /* Some of these identifiers already have a special kind. */
4259 if (pid->kind != cik_normal)
4260 set_identifier_kind (*pid->node, pid->kind);
4261 }
4262 }
4263
4264 /* Create the predefined scalar types of C,
4265 and some nodes representing standard constants (0, 1, (void *)0).
4266 Initialize the global binding level.
4267 Make definitions for built-in primitive functions. */
4268
4269 void
cxx_init_decl_processing(void)4270 cxx_init_decl_processing (void)
4271 {
4272 tree void_ftype;
4273 tree void_ftype_ptr;
4274
4275 /* Create all the identifiers we need. */
4276 initialize_predefined_identifiers ();
4277
4278 /* Create the global variables. */
4279 push_to_top_level ();
4280
4281 current_function_decl = NULL_TREE;
4282 current_binding_level = NULL;
4283 /* Enter the global namespace. */
4284 gcc_assert (global_namespace == NULL_TREE);
4285 global_namespace = build_lang_decl (NAMESPACE_DECL, global_identifier,
4286 void_type_node);
4287 TREE_PUBLIC (global_namespace) = 1;
4288 DECL_CONTEXT (global_namespace)
4289 = build_translation_unit_decl (get_identifier (main_input_filename));
4290 /* Remember whether we want the empty class passing ABI change warning
4291 in this TU. */
4292 TRANSLATION_UNIT_WARN_EMPTY_P (DECL_CONTEXT (global_namespace))
4293 = warn_abi && abi_version_crosses (12);
4294 debug_hooks->register_main_translation_unit
4295 (DECL_CONTEXT (global_namespace));
4296 begin_scope (sk_namespace, global_namespace);
4297 current_namespace = global_namespace;
4298
4299 if (flag_visibility_ms_compat)
4300 default_visibility = VISIBILITY_HIDDEN;
4301
4302 /* Initially, C. */
4303 current_lang_name = lang_name_c;
4304
4305 /* Create the `std' namespace. */
4306 push_namespace (get_identifier ("std"));
4307 std_node = current_namespace;
4308 pop_namespace ();
4309
4310 flag_noexcept_type = (cxx_dialect >= cxx17);
4311
4312 c_common_nodes_and_builtins ();
4313
4314 tree bool_ftype = build_function_type_list (boolean_type_node, NULL_TREE);
4315 tree decl
4316 = add_builtin_function ("__builtin_is_constant_evaluated",
4317 bool_ftype, CP_BUILT_IN_IS_CONSTANT_EVALUATED,
4318 BUILT_IN_FRONTEND, NULL, NULL_TREE);
4319 set_call_expr_flags (decl, ECF_CONST | ECF_NOTHROW | ECF_LEAF);
4320
4321 tree cptr_ftype = build_function_type_list (const_ptr_type_node, NULL_TREE);
4322 decl = add_builtin_function ("__builtin_source_location",
4323 cptr_ftype, CP_BUILT_IN_SOURCE_LOCATION,
4324 BUILT_IN_FRONTEND, NULL, NULL_TREE);
4325 set_call_expr_flags (decl, ECF_CONST | ECF_NOTHROW | ECF_LEAF);
4326
4327 integer_two_node = build_int_cst (NULL_TREE, 2);
4328
4329 /* Guess at the initial static decls size. */
4330 vec_alloc (static_decls, 500);
4331
4332 /* ... and keyed classes. */
4333 vec_alloc (keyed_classes, 100);
4334
4335 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
4336 truthvalue_type_node = boolean_type_node;
4337 truthvalue_false_node = boolean_false_node;
4338 truthvalue_true_node = boolean_true_node;
4339
4340 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
4341 noexcept_true_spec = build_tree_list (boolean_true_node, NULL_TREE);
4342 noexcept_false_spec = build_tree_list (boolean_false_node, NULL_TREE);
4343 noexcept_deferred_spec = build_tree_list (make_node (DEFERRED_NOEXCEPT),
4344 NULL_TREE);
4345
4346 #if 0
4347 record_builtin_type (RID_MAX, NULL, string_type_node);
4348 #endif
4349
4350 delta_type_node = ptrdiff_type_node;
4351 vtable_index_type = ptrdiff_type_node;
4352
4353 vtt_parm_type = build_pointer_type (const_ptr_type_node);
4354 void_ftype = build_function_type_list (void_type_node, NULL_TREE);
4355 void_ftype_ptr = build_function_type_list (void_type_node,
4356 ptr_type_node, NULL_TREE);
4357 void_ftype_ptr
4358 = build_exception_variant (void_ftype_ptr, empty_except_spec);
4359
4360 /* Create the conversion operator marker. This operator's DECL_NAME
4361 is in the identifier table, so we can use identifier equality to
4362 find it. */
4363 conv_op_marker = build_lang_decl (FUNCTION_DECL, conv_op_identifier,
4364 void_ftype);
4365
4366 /* C++ extensions */
4367
4368 unknown_type_node = make_node (LANG_TYPE);
4369 record_unknown_type (unknown_type_node, "unknown type");
4370
4371 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
4372 TREE_TYPE (unknown_type_node) = unknown_type_node;
4373
4374 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
4375 result. */
4376 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
4377 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
4378
4379 init_list_type_node = make_node (LANG_TYPE);
4380 record_unknown_type (init_list_type_node, "init list");
4381
4382 {
4383 /* Make sure we get a unique function type, so we can give
4384 its pointer type a name. (This wins for gdb.) */
4385 tree vfunc_type = make_node (FUNCTION_TYPE);
4386 TREE_TYPE (vfunc_type) = integer_type_node;
4387 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
4388 layout_type (vfunc_type);
4389
4390 vtable_entry_type = build_pointer_type (vfunc_type);
4391 }
4392 record_builtin_type (RID_MAX, "__vtbl_ptr_type", vtable_entry_type);
4393
4394 vtbl_type_node
4395 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
4396 layout_type (vtbl_type_node);
4397 vtbl_type_node = cp_build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
4398 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
4399 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
4400 layout_type (vtbl_ptr_type_node);
4401 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
4402
4403 push_namespace (get_identifier ("__cxxabiv1"));
4404 abi_node = current_namespace;
4405 pop_namespace ();
4406
4407 global_type_node = make_node (LANG_TYPE);
4408 record_unknown_type (global_type_node, "global type");
4409
4410 any_targ_node = make_node (LANG_TYPE);
4411 record_unknown_type (any_targ_node, "any type");
4412
4413 /* Now, C++. */
4414 current_lang_name = lang_name_cplusplus;
4415
4416 if (aligned_new_threshold > 1
4417 && !pow2p_hwi (aligned_new_threshold))
4418 {
4419 error ("%<-faligned-new=%d%> is not a power of two",
4420 aligned_new_threshold);
4421 aligned_new_threshold = 1;
4422 }
4423 if (aligned_new_threshold == -1)
4424 aligned_new_threshold = (cxx_dialect >= cxx17) ? 1 : 0;
4425 if (aligned_new_threshold == 1)
4426 aligned_new_threshold = malloc_alignment () / BITS_PER_UNIT;
4427
4428 {
4429 tree newattrs, extvisattr;
4430 tree newtype, deltype;
4431 tree ptr_ftype_sizetype;
4432 tree new_eh_spec;
4433
4434 ptr_ftype_sizetype
4435 = build_function_type_list (ptr_type_node, size_type_node, NULL_TREE);
4436 if (cxx_dialect == cxx98)
4437 {
4438 tree bad_alloc_id;
4439 tree bad_alloc_type_node;
4440 tree bad_alloc_decl;
4441
4442 push_nested_namespace (std_node);
4443 bad_alloc_id = get_identifier ("bad_alloc");
4444 bad_alloc_type_node = make_class_type (RECORD_TYPE);
4445 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
4446 bad_alloc_decl
4447 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
4448 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
4449 pop_nested_namespace (std_node);
4450
4451 new_eh_spec
4452 = add_exception_specifier (NULL_TREE, bad_alloc_type_node, -1);
4453 }
4454 else
4455 new_eh_spec = noexcept_false_spec;
4456
4457 /* Ensure attribs.c is initialized. */
4458 init_attributes ();
4459
4460 extvisattr = build_tree_list (get_identifier ("externally_visible"),
4461 NULL_TREE);
4462 newattrs = tree_cons (get_identifier ("alloc_size"),
4463 build_tree_list (NULL_TREE, integer_one_node),
4464 extvisattr);
4465 newtype = cp_build_type_attribute_variant (ptr_ftype_sizetype, newattrs);
4466 newtype = build_exception_variant (newtype, new_eh_spec);
4467 deltype = cp_build_type_attribute_variant (void_ftype_ptr, extvisattr);
4468 deltype = build_exception_variant (deltype, empty_except_spec);
4469 tree opnew = push_cp_library_fn (NEW_EXPR, newtype, 0);
4470 DECL_IS_MALLOC (opnew) = 1;
4471 DECL_SET_IS_OPERATOR_NEW (opnew, true);
4472 DECL_IS_REPLACEABLE_OPERATOR (opnew) = 1;
4473 opnew = push_cp_library_fn (VEC_NEW_EXPR, newtype, 0);
4474 DECL_IS_MALLOC (opnew) = 1;
4475 DECL_SET_IS_OPERATOR_NEW (opnew, true);
4476 DECL_IS_REPLACEABLE_OPERATOR (opnew) = 1;
4477 tree opdel = push_cp_library_fn (DELETE_EXPR, deltype, ECF_NOTHROW);
4478 DECL_SET_IS_OPERATOR_DELETE (opdel, true);
4479 DECL_IS_REPLACEABLE_OPERATOR (opdel) = 1;
4480 opdel = push_cp_library_fn (VEC_DELETE_EXPR, deltype, ECF_NOTHROW);
4481 DECL_SET_IS_OPERATOR_DELETE (opdel, true);
4482 DECL_IS_REPLACEABLE_OPERATOR (opdel) = 1;
4483 if (flag_sized_deallocation)
4484 {
4485 /* Also push the sized deallocation variants:
4486 void operator delete(void*, std::size_t) throw();
4487 void operator delete[](void*, std::size_t) throw(); */
4488 tree void_ftype_ptr_size
4489 = build_function_type_list (void_type_node, ptr_type_node,
4490 size_type_node, NULL_TREE);
4491 deltype = cp_build_type_attribute_variant (void_ftype_ptr_size,
4492 extvisattr);
4493 deltype = build_exception_variant (deltype, empty_except_spec);
4494 opdel = push_cp_library_fn (DELETE_EXPR, deltype, ECF_NOTHROW);
4495 DECL_SET_IS_OPERATOR_DELETE (opdel, true);
4496 DECL_IS_REPLACEABLE_OPERATOR (opdel) = 1;
4497 opdel = push_cp_library_fn (VEC_DELETE_EXPR, deltype, ECF_NOTHROW);
4498 DECL_SET_IS_OPERATOR_DELETE (opdel, true);
4499 DECL_IS_REPLACEABLE_OPERATOR (opdel) = 1;
4500 }
4501
4502 if (aligned_new_threshold)
4503 {
4504 push_nested_namespace (std_node);
4505 tree align_id = get_identifier ("align_val_t");
4506 align_type_node = start_enum (align_id, NULL_TREE, size_type_node,
4507 NULL_TREE, /*scoped*/true, NULL);
4508 pop_nested_namespace (std_node);
4509
4510 /* operator new (size_t, align_val_t); */
4511 newtype = build_function_type_list (ptr_type_node, size_type_node,
4512 align_type_node, NULL_TREE);
4513 newtype = cp_build_type_attribute_variant (newtype, newattrs);
4514 newtype = build_exception_variant (newtype, new_eh_spec);
4515 opnew = push_cp_library_fn (NEW_EXPR, newtype, 0);
4516 DECL_IS_MALLOC (opnew) = 1;
4517 DECL_SET_IS_OPERATOR_NEW (opnew, true);
4518 DECL_IS_REPLACEABLE_OPERATOR (opnew) = 1;
4519 opnew = push_cp_library_fn (VEC_NEW_EXPR, newtype, 0);
4520 DECL_IS_MALLOC (opnew) = 1;
4521 DECL_SET_IS_OPERATOR_NEW (opnew, true);
4522 DECL_IS_REPLACEABLE_OPERATOR (opnew) = 1;
4523
4524 /* operator delete (void *, align_val_t); */
4525 deltype = build_function_type_list (void_type_node, ptr_type_node,
4526 align_type_node, NULL_TREE);
4527 deltype = cp_build_type_attribute_variant (deltype, extvisattr);
4528 deltype = build_exception_variant (deltype, empty_except_spec);
4529 opdel = push_cp_library_fn (DELETE_EXPR, deltype, ECF_NOTHROW);
4530 DECL_SET_IS_OPERATOR_DELETE (opdel, true);
4531 DECL_IS_REPLACEABLE_OPERATOR (opdel) = 1;
4532 opdel = push_cp_library_fn (VEC_DELETE_EXPR, deltype, ECF_NOTHROW);
4533 DECL_SET_IS_OPERATOR_DELETE (opdel, true);
4534 DECL_IS_REPLACEABLE_OPERATOR (opdel) = 1;
4535
4536 if (flag_sized_deallocation)
4537 {
4538 /* operator delete (void *, size_t, align_val_t); */
4539 deltype = build_function_type_list (void_type_node, ptr_type_node,
4540 size_type_node, align_type_node,
4541 NULL_TREE);
4542 deltype = cp_build_type_attribute_variant (deltype, extvisattr);
4543 deltype = build_exception_variant (deltype, empty_except_spec);
4544 opdel = push_cp_library_fn (DELETE_EXPR, deltype, ECF_NOTHROW);
4545 DECL_SET_IS_OPERATOR_DELETE (opdel, true);
4546 DECL_IS_REPLACEABLE_OPERATOR (opdel) = 1;
4547 opdel = push_cp_library_fn (VEC_DELETE_EXPR, deltype, ECF_NOTHROW);
4548 DECL_SET_IS_OPERATOR_DELETE (opdel, true);
4549 DECL_IS_REPLACEABLE_OPERATOR (opdel) = 1;
4550 }
4551 }
4552
4553 nullptr_type_node = make_node (NULLPTR_TYPE);
4554 TYPE_SIZE (nullptr_type_node) = bitsize_int (GET_MODE_BITSIZE (ptr_mode));
4555 TYPE_SIZE_UNIT (nullptr_type_node) = size_int (GET_MODE_SIZE (ptr_mode));
4556 TYPE_UNSIGNED (nullptr_type_node) = 1;
4557 TYPE_PRECISION (nullptr_type_node) = GET_MODE_BITSIZE (ptr_mode);
4558 if (abi_version_at_least (9))
4559 SET_TYPE_ALIGN (nullptr_type_node, GET_MODE_ALIGNMENT (ptr_mode));
4560 SET_TYPE_MODE (nullptr_type_node, ptr_mode);
4561 record_builtin_type (RID_MAX, "decltype(nullptr)", nullptr_type_node);
4562 nullptr_node = build_int_cst (nullptr_type_node, 0);
4563 }
4564
4565 abort_fndecl
4566 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype,
4567 ECF_NORETURN | ECF_NOTHROW | ECF_COLD);
4568
4569 /* Perform other language dependent initializations. */
4570 init_class_processing ();
4571 init_rtti_processing ();
4572 init_template_processing ();
4573
4574 if (flag_exceptions)
4575 init_exception_processing ();
4576
4577 if (! supports_one_only ())
4578 flag_weak = 0;
4579
4580 make_fname_decl = cp_make_fname_decl;
4581 start_fname_decls ();
4582
4583 /* Show we use EH for cleanups. */
4584 if (flag_exceptions)
4585 using_eh_for_cleanups ();
4586 }
4587
4588 /* Generate an initializer for a function naming variable from
4589 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
4590 filled in with the type of the init. */
4591
4592 tree
cp_fname_init(const char * name,tree * type_p)4593 cp_fname_init (const char* name, tree *type_p)
4594 {
4595 tree domain = NULL_TREE;
4596 tree type;
4597 tree init = NULL_TREE;
4598 size_t length = 0;
4599
4600 if (name)
4601 {
4602 length = strlen (name);
4603 domain = build_index_type (size_int (length));
4604 init = build_string (length + 1, name);
4605 }
4606
4607 type = cp_build_qualified_type (char_type_node, TYPE_QUAL_CONST);
4608 type = build_cplus_array_type (type, domain);
4609
4610 *type_p = type;
4611
4612 if (init)
4613 TREE_TYPE (init) = type;
4614 else
4615 init = error_mark_node;
4616
4617 return init;
4618 }
4619
4620 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
4621 the decl, LOC is the location to give the decl, NAME is the
4622 initialization string and TYPE_DEP indicates whether NAME depended
4623 on the type of the function. We make use of that to detect
4624 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
4625 at the point of first use, so we mustn't push the decl now. */
4626
4627 static tree
cp_make_fname_decl(location_t loc,tree id,int type_dep)4628 cp_make_fname_decl (location_t loc, tree id, int type_dep)
4629 {
4630 const char * name = NULL;
4631 bool release_name = false;
4632 if (!(type_dep && in_template_function ()))
4633 {
4634 if (current_function_decl == NULL_TREE)
4635 name = "top level";
4636 else if (type_dep == 1) /* __PRETTY_FUNCTION__ */
4637 name = cxx_printable_name (current_function_decl, 2);
4638 else if (type_dep == 0) /* __FUNCTION__ */
4639 {
4640 name = fname_as_string (type_dep);
4641 release_name = true;
4642 }
4643 else
4644 gcc_unreachable ();
4645 }
4646 tree type;
4647 tree init = cp_fname_init (name, &type);
4648 tree decl = build_decl (loc, VAR_DECL, id, type);
4649
4650 if (release_name)
4651 free (CONST_CAST (char *, name));
4652
4653 /* As we're using pushdecl_with_scope, we must set the context. */
4654 DECL_CONTEXT (decl) = current_function_decl;
4655
4656 TREE_READONLY (decl) = 1;
4657 DECL_ARTIFICIAL (decl) = 1;
4658 DECL_DECLARED_CONSTEXPR_P (decl) = 1;
4659 TREE_STATIC (decl) = 1;
4660
4661 TREE_USED (decl) = 1;
4662
4663 if (init)
4664 {
4665 SET_DECL_VALUE_EXPR (decl, init);
4666 DECL_HAS_VALUE_EXPR_P (decl) = 1;
4667 /* For decl_constant_var_p. */
4668 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
4669 }
4670
4671 if (current_function_decl)
4672 {
4673 DECL_CONTEXT (decl) = current_function_decl;
4674 decl = pushdecl_outermost_localscope (decl);
4675 if (decl != error_mark_node)
4676 add_decl_expr (decl);
4677 }
4678 else
4679 {
4680 DECL_THIS_STATIC (decl) = true;
4681 pushdecl_top_level_and_finish (decl, NULL_TREE);
4682 }
4683
4684 return decl;
4685 }
4686
4687 /* Install DECL as a builtin function at current (global) scope.
4688 Return the new decl (if we found an existing version). Also
4689 installs it into ::std, if it's not '_*'. */
4690
4691 tree
cxx_builtin_function(tree decl)4692 cxx_builtin_function (tree decl)
4693 {
4694 retrofit_lang_decl (decl);
4695
4696 DECL_ARTIFICIAL (decl) = 1;
4697 SET_DECL_LANGUAGE (decl, lang_c);
4698 /* Runtime library routines are, by definition, available in an
4699 external shared object. */
4700 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
4701 DECL_VISIBILITY_SPECIFIED (decl) = 1;
4702
4703 tree id = DECL_NAME (decl);
4704 const char *name = IDENTIFIER_POINTER (id);
4705 if (name[0] != '_' || name[1] != '_')
4706 /* In the user's namespace, it must be declared before use. */
4707 DECL_ANTICIPATED (decl) = 1;
4708 else if (IDENTIFIER_LENGTH (id) > strlen ("___chk")
4709 && 0 != strncmp (name + 2, "builtin_", strlen ("builtin_"))
4710 && 0 == memcmp (name + IDENTIFIER_LENGTH (id) - strlen ("_chk"),
4711 "_chk", strlen ("_chk") + 1))
4712 /* Treat __*_chk fortification functions as anticipated as well,
4713 unless they are __builtin_*_chk. */
4714 DECL_ANTICIPATED (decl) = 1;
4715
4716 /* All builtins that don't begin with an '_' should additionally
4717 go in the 'std' namespace. */
4718 if (name[0] != '_')
4719 {
4720 tree std_decl = copy_decl (decl);
4721
4722 push_nested_namespace (std_node);
4723 DECL_CONTEXT (std_decl) = FROB_CONTEXT (std_node);
4724 pushdecl (std_decl);
4725 pop_nested_namespace (std_node);
4726 }
4727
4728 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
4729 decl = pushdecl (decl);
4730
4731 return decl;
4732 }
4733
4734 /* Like cxx_builtin_function, but guarantee the function is added to the global
4735 scope. This is to allow function specific options to add new machine
4736 dependent builtins when the target ISA changes via attribute((target(...)))
4737 which saves space on program startup if the program does not use non-generic
4738 ISAs. */
4739
4740 tree
cxx_builtin_function_ext_scope(tree decl)4741 cxx_builtin_function_ext_scope (tree decl)
4742 {
4743 push_nested_namespace (global_namespace);
4744 decl = cxx_builtin_function (decl);
4745 pop_nested_namespace (global_namespace);
4746
4747 return decl;
4748 }
4749
4750 /* Implement LANG_HOOKS_SIMULATE_BUILTIN_FUNCTION_DECL. */
4751
4752 tree
cxx_simulate_builtin_function_decl(tree decl)4753 cxx_simulate_builtin_function_decl (tree decl)
4754 {
4755 retrofit_lang_decl (decl);
4756
4757 DECL_ARTIFICIAL (decl) = 1;
4758 SET_DECL_LANGUAGE (decl, lang_cplusplus);
4759 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
4760 return pushdecl (decl);
4761 }
4762
4763 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
4764 function. Not called directly. */
4765
4766 static tree
build_library_fn(tree name,enum tree_code operator_code,tree type,int ecf_flags)4767 build_library_fn (tree name, enum tree_code operator_code, tree type,
4768 int ecf_flags)
4769 {
4770 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
4771 DECL_EXTERNAL (fn) = 1;
4772 TREE_PUBLIC (fn) = 1;
4773 DECL_ARTIFICIAL (fn) = 1;
4774 DECL_OVERLOADED_OPERATOR_CODE_RAW (fn)
4775 = OVL_OP_INFO (false, operator_code)->ovl_op_code;
4776 SET_DECL_LANGUAGE (fn, lang_c);
4777 /* Runtime library routines are, by definition, available in an
4778 external shared object. */
4779 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
4780 DECL_VISIBILITY_SPECIFIED (fn) = 1;
4781 set_call_expr_flags (fn, ecf_flags);
4782 return fn;
4783 }
4784
4785 /* Returns the _DECL for a library function with C++ linkage. */
4786
4787 static tree
build_cp_library_fn(tree name,enum tree_code operator_code,tree type,int ecf_flags)4788 build_cp_library_fn (tree name, enum tree_code operator_code, tree type,
4789 int ecf_flags)
4790 {
4791 tree fn = build_library_fn (name, operator_code, type, ecf_flags);
4792 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
4793 SET_DECL_LANGUAGE (fn, lang_cplusplus);
4794 return fn;
4795 }
4796
4797 /* Like build_library_fn, but takes a C string instead of an
4798 IDENTIFIER_NODE. */
4799
4800 tree
build_library_fn_ptr(const char * name,tree type,int ecf_flags)4801 build_library_fn_ptr (const char* name, tree type, int ecf_flags)
4802 {
4803 return build_library_fn (get_identifier (name), ERROR_MARK, type, ecf_flags);
4804 }
4805
4806 /* Like build_cp_library_fn, but takes a C string instead of an
4807 IDENTIFIER_NODE. */
4808
4809 tree
build_cp_library_fn_ptr(const char * name,tree type,int ecf_flags)4810 build_cp_library_fn_ptr (const char* name, tree type, int ecf_flags)
4811 {
4812 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type,
4813 ecf_flags);
4814 }
4815
4816 /* Like build_library_fn, but also pushes the function so that we will
4817 be able to find it via get_global_binding. Also, the function
4818 may throw exceptions listed in RAISES. */
4819
4820 tree
push_library_fn(tree name,tree type,tree raises,int ecf_flags)4821 push_library_fn (tree name, tree type, tree raises, int ecf_flags)
4822 {
4823 tree fn;
4824
4825 if (raises)
4826 type = build_exception_variant (type, raises);
4827
4828 fn = build_library_fn (name, ERROR_MARK, type, ecf_flags);
4829 pushdecl_top_level (fn);
4830 return fn;
4831 }
4832
4833 /* Like build_cp_library_fn, but also pushes the function so that it
4834 will be found by normal lookup. */
4835
4836 static tree
push_cp_library_fn(enum tree_code operator_code,tree type,int ecf_flags)4837 push_cp_library_fn (enum tree_code operator_code, tree type,
4838 int ecf_flags)
4839 {
4840 tree fn = build_cp_library_fn (ovl_op_identifier (false, operator_code),
4841 operator_code, type, ecf_flags);
4842 pushdecl (fn);
4843 if (flag_tm)
4844 apply_tm_attr (fn, get_identifier ("transaction_safe"));
4845 return fn;
4846 }
4847
4848 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
4849 a FUNCTION_TYPE. */
4850
4851 tree
push_void_library_fn(tree name,tree parmtypes,int ecf_flags)4852 push_void_library_fn (tree name, tree parmtypes, int ecf_flags)
4853 {
4854 tree type = build_function_type (void_type_node, parmtypes);
4855 return push_library_fn (name, type, NULL_TREE, ecf_flags);
4856 }
4857
4858 /* Like push_library_fn, but also note that this function throws
4859 and does not return. Used for __throw_foo and the like. */
4860
4861 tree
push_throw_library_fn(tree name,tree type)4862 push_throw_library_fn (tree name, tree type)
4863 {
4864 tree fn = push_library_fn (name, type, NULL_TREE, ECF_NORETURN | ECF_COLD);
4865 return fn;
4866 }
4867
4868 /* When we call finish_struct for an anonymous union, we create
4869 default copy constructors and such. But, an anonymous union
4870 shouldn't have such things; this function undoes the damage to the
4871 anonymous union type T.
4872
4873 (The reason that we create the synthesized methods is that we don't
4874 distinguish `union { int i; }' from `typedef union { int i; } U'.
4875 The first is an anonymous union; the second is just an ordinary
4876 union type.) */
4877
4878 void
fixup_anonymous_aggr(tree t)4879 fixup_anonymous_aggr (tree t)
4880 {
4881 /* Wipe out memory of synthesized methods. */
4882 TYPE_HAS_USER_CONSTRUCTOR (t) = 0;
4883 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
4884 TYPE_HAS_COPY_CTOR (t) = 0;
4885 TYPE_HAS_CONST_COPY_CTOR (t) = 0;
4886 TYPE_HAS_COPY_ASSIGN (t) = 0;
4887 TYPE_HAS_CONST_COPY_ASSIGN (t) = 0;
4888
4889 /* Splice the implicitly generated functions out of TYPE_FIELDS. */
4890 for (tree probe, *prev_p = &TYPE_FIELDS (t); (probe = *prev_p);)
4891 if (TREE_CODE (probe) == FUNCTION_DECL && DECL_ARTIFICIAL (probe))
4892 *prev_p = DECL_CHAIN (probe);
4893 else
4894 prev_p = &DECL_CHAIN (probe);
4895
4896 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
4897 assignment operators (because they cannot have these methods themselves).
4898 For anonymous unions this is already checked because they are not allowed
4899 in any union, otherwise we have to check it. */
4900 if (TREE_CODE (t) != UNION_TYPE)
4901 {
4902 tree field, type;
4903
4904 for (field = TYPE_FIELDS (t); field; field = DECL_CHAIN (field))
4905 if (TREE_CODE (field) == FIELD_DECL)
4906 {
4907 type = TREE_TYPE (field);
4908 if (CLASS_TYPE_P (type))
4909 {
4910 if (TYPE_NEEDS_CONSTRUCTING (type))
4911 error ("member %q+#D with constructor not allowed "
4912 "in anonymous aggregate", field);
4913 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
4914 error ("member %q+#D with destructor not allowed "
4915 "in anonymous aggregate", field);
4916 if (TYPE_HAS_COMPLEX_COPY_ASSIGN (type))
4917 error ("member %q+#D with copy assignment operator "
4918 "not allowed in anonymous aggregate", field);
4919 }
4920 }
4921 }
4922 }
4923
4924 /* Warn for an attribute located at LOCATION that appertains to the
4925 class type CLASS_TYPE that has not been properly placed after its
4926 class-key, in it class-specifier. */
4927
4928 void
warn_misplaced_attr_for_class_type(location_t location,tree class_type)4929 warn_misplaced_attr_for_class_type (location_t location,
4930 tree class_type)
4931 {
4932 gcc_assert (OVERLOAD_TYPE_P (class_type));
4933
4934 auto_diagnostic_group d;
4935 if (warning_at (location, OPT_Wattributes,
4936 "attribute ignored in declaration "
4937 "of %q#T", class_type))
4938 inform (location,
4939 "attribute for %q#T must follow the %qs keyword",
4940 class_type, class_key_or_enum_as_string (class_type));
4941 }
4942
4943 /* Returns the cv-qualifiers that apply to the type specified
4944 by the DECLSPECS. */
4945
4946 static int
get_type_quals(const cp_decl_specifier_seq * declspecs)4947 get_type_quals (const cp_decl_specifier_seq *declspecs)
4948 {
4949 int type_quals = TYPE_UNQUALIFIED;
4950
4951 if (decl_spec_seq_has_spec_p (declspecs, ds_const))
4952 type_quals |= TYPE_QUAL_CONST;
4953 if (decl_spec_seq_has_spec_p (declspecs, ds_volatile))
4954 type_quals |= TYPE_QUAL_VOLATILE;
4955 if (decl_spec_seq_has_spec_p (declspecs, ds_restrict))
4956 type_quals |= TYPE_QUAL_RESTRICT;
4957
4958 return type_quals;
4959 }
4960
4961 /* Make sure that a declaration with no declarator is well-formed, i.e.
4962 just declares a tagged type or anonymous union.
4963
4964 Returns the type declared; or NULL_TREE if none. */
4965
4966 tree
check_tag_decl(cp_decl_specifier_seq * declspecs,bool explicit_type_instantiation_p)4967 check_tag_decl (cp_decl_specifier_seq *declspecs,
4968 bool explicit_type_instantiation_p)
4969 {
4970 int saw_friend = decl_spec_seq_has_spec_p (declspecs, ds_friend);
4971 int saw_typedef = decl_spec_seq_has_spec_p (declspecs, ds_typedef);
4972 /* If a class, struct, or enum type is declared by the DECLSPECS
4973 (i.e, if a class-specifier, enum-specifier, or non-typename
4974 elaborated-type-specifier appears in the DECLSPECS),
4975 DECLARED_TYPE is set to the corresponding type. */
4976 tree declared_type = NULL_TREE;
4977 bool error_p = false;
4978
4979 if (declspecs->multiple_types_p)
4980 error_at (smallest_type_location (declspecs),
4981 "multiple types in one declaration");
4982 else if (declspecs->redefined_builtin_type)
4983 {
4984 location_t loc = declspecs->locations[ds_redefined_builtin_type_spec];
4985 if (!in_system_header_at (loc))
4986 permerror (loc, "redeclaration of C++ built-in type %qT",
4987 declspecs->redefined_builtin_type);
4988 return NULL_TREE;
4989 }
4990
4991 if (declspecs->type
4992 && TYPE_P (declspecs->type)
4993 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
4994 && MAYBE_CLASS_TYPE_P (declspecs->type))
4995 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
4996 declared_type = declspecs->type;
4997 else if (declspecs->type == error_mark_node)
4998 error_p = true;
4999
5000 if (type_uses_auto (declared_type))
5001 {
5002 error_at (declspecs->locations[ds_type_spec],
5003 "%<auto%> can only be specified for variables "
5004 "or function declarations");
5005 return error_mark_node;
5006 }
5007
5008 if (declared_type && !OVERLOAD_TYPE_P (declared_type))
5009 declared_type = NULL_TREE;
5010
5011 if (!declared_type && !saw_friend && !error_p)
5012 permerror (input_location, "declaration does not declare anything");
5013 /* Check for an anonymous union. */
5014 else if (declared_type && RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type))
5015 && TYPE_UNNAMED_P (declared_type))
5016 {
5017 /* 7/3 In a simple-declaration, the optional init-declarator-list
5018 can be omitted only when declaring a class (clause 9) or
5019 enumeration (7.2), that is, when the decl-specifier-seq contains
5020 either a class-specifier, an elaborated-type-specifier with
5021 a class-key (9.1), or an enum-specifier. In these cases and
5022 whenever a class-specifier or enum-specifier is present in the
5023 decl-specifier-seq, the identifiers in these specifiers are among
5024 the names being declared by the declaration (as class-name,
5025 enum-names, or enumerators, depending on the syntax). In such
5026 cases, and except for the declaration of an unnamed bit-field (9.6),
5027 the decl-specifier-seq shall introduce one or more names into the
5028 program, or shall redeclare a name introduced by a previous
5029 declaration. [Example:
5030 enum { }; // ill-formed
5031 typedef class { }; // ill-formed
5032 --end example] */
5033 if (saw_typedef)
5034 {
5035 error_at (declspecs->locations[ds_typedef],
5036 "missing type-name in typedef-declaration");
5037 return NULL_TREE;
5038 }
5039 /* Anonymous unions are objects, so they can have specifiers. */;
5040 SET_ANON_AGGR_TYPE_P (declared_type);
5041
5042 if (TREE_CODE (declared_type) != UNION_TYPE)
5043 pedwarn (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (declared_type)),
5044 OPT_Wpedantic, "ISO C++ prohibits anonymous structs");
5045 }
5046
5047 else
5048 {
5049 if (decl_spec_seq_has_spec_p (declspecs, ds_inline))
5050 error_at (declspecs->locations[ds_inline],
5051 "%<inline%> can only be specified for functions");
5052 else if (decl_spec_seq_has_spec_p (declspecs, ds_virtual))
5053 error_at (declspecs->locations[ds_virtual],
5054 "%<virtual%> can only be specified for functions");
5055 else if (saw_friend
5056 && (!current_class_type
5057 || current_scope () != current_class_type))
5058 error_at (declspecs->locations[ds_friend],
5059 "%<friend%> can only be specified inside a class");
5060 else if (decl_spec_seq_has_spec_p (declspecs, ds_explicit))
5061 error_at (declspecs->locations[ds_explicit],
5062 "%<explicit%> can only be specified for constructors");
5063 else if (declspecs->storage_class)
5064 error_at (declspecs->locations[ds_storage_class],
5065 "a storage class can only be specified for objects "
5066 "and functions");
5067 else if (decl_spec_seq_has_spec_p (declspecs, ds_const))
5068 error_at (declspecs->locations[ds_const],
5069 "%<const%> can only be specified for objects and "
5070 "functions");
5071 else if (decl_spec_seq_has_spec_p (declspecs, ds_volatile))
5072 error_at (declspecs->locations[ds_volatile],
5073 "%<volatile%> can only be specified for objects and "
5074 "functions");
5075 else if (decl_spec_seq_has_spec_p (declspecs, ds_restrict))
5076 error_at (declspecs->locations[ds_restrict],
5077 "%<__restrict%> can only be specified for objects and "
5078 "functions");
5079 else if (decl_spec_seq_has_spec_p (declspecs, ds_thread))
5080 error_at (declspecs->locations[ds_thread],
5081 "%<__thread%> can only be specified for objects "
5082 "and functions");
5083 else if (saw_typedef)
5084 warning_at (declspecs->locations[ds_typedef], 0,
5085 "%<typedef%> was ignored in this declaration");
5086 else if (decl_spec_seq_has_spec_p (declspecs, ds_constexpr))
5087 error_at (declspecs->locations[ds_constexpr],
5088 "%qs cannot be used for type declarations", "constexpr");
5089 else if (decl_spec_seq_has_spec_p (declspecs, ds_constinit))
5090 error_at (declspecs->locations[ds_constinit],
5091 "%qs cannot be used for type declarations", "constinit");
5092 else if (decl_spec_seq_has_spec_p (declspecs, ds_consteval))
5093 error_at (declspecs->locations[ds_consteval],
5094 "%qs cannot be used for type declarations", "consteval");
5095 }
5096
5097 if (declspecs->attributes && warn_attributes && declared_type)
5098 {
5099 location_t loc;
5100 if (!CLASS_TYPE_P (declared_type)
5101 || !CLASSTYPE_TEMPLATE_INSTANTIATION (declared_type))
5102 /* For a non-template class, use the name location. */
5103 loc = location_of (declared_type);
5104 else
5105 /* For a template class (an explicit instantiation), use the
5106 current location. */
5107 loc = input_location;
5108
5109 if (explicit_type_instantiation_p)
5110 /* [dcl.attr.grammar]/4:
5111
5112 No attribute-specifier-seq shall appertain to an explicit
5113 instantiation. */
5114 {
5115 if (warning_at (loc, OPT_Wattributes,
5116 "attribute ignored in explicit instantiation %q#T",
5117 declared_type))
5118 inform (loc,
5119 "no attribute can be applied to "
5120 "an explicit instantiation");
5121 }
5122 else
5123 warn_misplaced_attr_for_class_type (loc, declared_type);
5124 }
5125
5126 return declared_type;
5127 }
5128
5129 /* Called when a declaration is seen that contains no names to declare.
5130 If its type is a reference to a structure, union or enum inherited
5131 from a containing scope, shadow that tag name for the current scope
5132 with a forward reference.
5133 If its type defines a new named structure or union
5134 or defines an enum, it is valid but we need not do anything here.
5135 Otherwise, it is an error.
5136
5137 C++: may have to grok the declspecs to learn about static,
5138 complain for anonymous unions.
5139
5140 Returns the TYPE declared -- or NULL_TREE if none. */
5141
5142 tree
shadow_tag(cp_decl_specifier_seq * declspecs)5143 shadow_tag (cp_decl_specifier_seq *declspecs)
5144 {
5145 tree t = check_tag_decl (declspecs,
5146 /*explicit_type_instantiation_p=*/false);
5147
5148 if (!t)
5149 return NULL_TREE;
5150
5151 if (maybe_process_partial_specialization (t) == error_mark_node)
5152 return NULL_TREE;
5153
5154 /* This is where the variables in an anonymous union are
5155 declared. An anonymous union declaration looks like:
5156 union { ... } ;
5157 because there is no declarator after the union, the parser
5158 sends that declaration here. */
5159 if (ANON_AGGR_TYPE_P (t))
5160 {
5161 fixup_anonymous_aggr (t);
5162
5163 if (TYPE_FIELDS (t))
5164 {
5165 tree decl = grokdeclarator (/*declarator=*/NULL,
5166 declspecs, NORMAL, 0, NULL);
5167 finish_anon_union (decl);
5168 }
5169 }
5170
5171 return t;
5172 }
5173
5174 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
5175
5176 tree
groktypename(cp_decl_specifier_seq * type_specifiers,const cp_declarator * declarator,bool is_template_arg)5177 groktypename (cp_decl_specifier_seq *type_specifiers,
5178 const cp_declarator *declarator,
5179 bool is_template_arg)
5180 {
5181 tree attrs;
5182 tree type;
5183 enum decl_context context
5184 = is_template_arg ? TEMPLATE_TYPE_ARG : TYPENAME;
5185 attrs = type_specifiers->attributes;
5186 type_specifiers->attributes = NULL_TREE;
5187 type = grokdeclarator (declarator, type_specifiers, context, 0, &attrs);
5188 if (attrs && type != error_mark_node)
5189 {
5190 if (CLASS_TYPE_P (type))
5191 warning (OPT_Wattributes, "ignoring attributes applied to class type %qT "
5192 "outside of definition", type);
5193 else if (MAYBE_CLASS_TYPE_P (type))
5194 /* A template type parameter or other dependent type. */
5195 warning (OPT_Wattributes, "ignoring attributes applied to dependent "
5196 "type %qT without an associated declaration", type);
5197 else
5198 cplus_decl_attributes (&type, attrs, 0);
5199 }
5200 return type;
5201 }
5202
5203 /* Process a DECLARATOR for a function-scope variable declaration,
5204 namespace-scope variable declaration, or function declaration.
5205 (Function definitions go through start_function; class member
5206 declarations appearing in the body of the class go through
5207 grokfield.) The DECL corresponding to the DECLARATOR is returned.
5208 If an error occurs, the error_mark_node is returned instead.
5209
5210 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
5211 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
5212 for an explicitly defaulted function, or SD_DELETED for an explicitly
5213 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
5214 implicitly initialized via a default constructor. ATTRIBUTES and
5215 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
5216
5217 The scope represented by the context of the returned DECL is pushed
5218 (if it is not the global namespace) and is assigned to
5219 *PUSHED_SCOPE_P. The caller is then responsible for calling
5220 pop_scope on *PUSHED_SCOPE_P if it is set. */
5221
5222 tree
start_decl(const cp_declarator * declarator,cp_decl_specifier_seq * declspecs,int initialized,tree attributes,tree prefix_attributes,tree * pushed_scope_p)5223 start_decl (const cp_declarator *declarator,
5224 cp_decl_specifier_seq *declspecs,
5225 int initialized,
5226 tree attributes,
5227 tree prefix_attributes,
5228 tree *pushed_scope_p)
5229 {
5230 tree decl;
5231 tree context;
5232 bool was_public;
5233 int flags;
5234 bool alias;
5235
5236 *pushed_scope_p = NULL_TREE;
5237
5238 /* An object declared as __attribute__((deprecated)) suppresses
5239 warnings of uses of other deprecated items. */
5240 if (lookup_attribute ("deprecated", attributes))
5241 deprecated_state = DEPRECATED_SUPPRESS;
5242
5243 attributes = chainon (attributes, prefix_attributes);
5244
5245 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
5246 &attributes);
5247
5248 deprecated_state = DEPRECATED_NORMAL;
5249
5250 if (decl == NULL_TREE || VOID_TYPE_P (decl)
5251 || decl == error_mark_node)
5252 return error_mark_node;
5253
5254 context = CP_DECL_CONTEXT (decl);
5255 if (context != global_namespace)
5256 *pushed_scope_p = push_scope (context);
5257
5258 /* Is it valid for this decl to have an initializer at all?
5259 If not, set INITIALIZED to zero, which will indirectly
5260 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
5261 if (initialized
5262 && TREE_CODE (decl) == TYPE_DECL)
5263 {
5264 error_at (DECL_SOURCE_LOCATION (decl),
5265 "typedef %qD is initialized (use %qs instead)",
5266 decl, "decltype");
5267 return error_mark_node;
5268 }
5269
5270 if (initialized)
5271 {
5272 if (! toplevel_bindings_p ()
5273 && DECL_EXTERNAL (decl))
5274 warning (0, "declaration of %q#D has %<extern%> and is initialized",
5275 decl);
5276 DECL_EXTERNAL (decl) = 0;
5277 if (toplevel_bindings_p ())
5278 TREE_STATIC (decl) = 1;
5279 }
5280 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl)) != 0;
5281
5282 if (alias && TREE_CODE (decl) == FUNCTION_DECL)
5283 record_key_method_defined (decl);
5284
5285 /* If this is a typedef that names the class for linkage purposes
5286 (7.1.3p8), apply any attributes directly to the type. */
5287 if (TREE_CODE (decl) == TYPE_DECL
5288 && OVERLOAD_TYPE_P (TREE_TYPE (decl))
5289 && decl == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl))))
5290 flags = ATTR_FLAG_TYPE_IN_PLACE;
5291 else
5292 flags = 0;
5293
5294 /* Set attributes here so if duplicate decl, will have proper attributes. */
5295 cplus_decl_attributes (&decl, attributes, flags);
5296
5297 /* Dllimported symbols cannot be defined. Static data members (which
5298 can be initialized in-class and dllimported) go through grokfield,
5299 not here, so we don't need to exclude those decls when checking for
5300 a definition. */
5301 if (initialized && DECL_DLLIMPORT_P (decl))
5302 {
5303 error_at (DECL_SOURCE_LOCATION (decl),
5304 "definition of %q#D is marked %<dllimport%>", decl);
5305 DECL_DLLIMPORT_P (decl) = 0;
5306 }
5307
5308 /* If #pragma weak was used, mark the decl weak now. */
5309 if (!processing_template_decl && !DECL_DECOMPOSITION_P (decl))
5310 maybe_apply_pragma_weak (decl);
5311
5312 if (TREE_CODE (decl) == FUNCTION_DECL
5313 && DECL_DECLARED_INLINE_P (decl)
5314 && DECL_UNINLINABLE (decl)
5315 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
5316 warning_at (DECL_SOURCE_LOCATION (decl), 0,
5317 "inline function %qD given attribute %qs", decl, "noinline");
5318
5319 if (TYPE_P (context) && COMPLETE_TYPE_P (complete_type (context)))
5320 {
5321 bool this_tmpl = (processing_template_decl
5322 > template_class_depth (context));
5323 if (VAR_P (decl))
5324 {
5325 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
5326 if (field == NULL_TREE
5327 || !(VAR_P (field) || variable_template_p (field)))
5328 error ("%q+#D is not a static data member of %q#T", decl, context);
5329 else if (variable_template_p (field)
5330 && (DECL_LANG_SPECIFIC (decl)
5331 && DECL_TEMPLATE_SPECIALIZATION (decl)))
5332 /* OK, specialization was already checked. */;
5333 else if (variable_template_p (field) && !this_tmpl)
5334 {
5335 error_at (DECL_SOURCE_LOCATION (decl),
5336 "non-member-template declaration of %qD", decl);
5337 inform (DECL_SOURCE_LOCATION (field), "does not match "
5338 "member template declaration here");
5339 return error_mark_node;
5340 }
5341 else
5342 {
5343 if (variable_template_p (field))
5344 field = DECL_TEMPLATE_RESULT (field);
5345
5346 if (DECL_CONTEXT (field) != context)
5347 {
5348 if (!same_type_p (DECL_CONTEXT (field), context))
5349 permerror (input_location, "ISO C++ does not permit %<%T::%D%> "
5350 "to be defined as %<%T::%D%>",
5351 DECL_CONTEXT (field), DECL_NAME (decl),
5352 context, DECL_NAME (decl));
5353 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
5354 }
5355 /* Static data member are tricky; an in-class initialization
5356 still doesn't provide a definition, so the in-class
5357 declaration will have DECL_EXTERNAL set, but will have an
5358 initialization. Thus, duplicate_decls won't warn
5359 about this situation, and so we check here. */
5360 if (initialized && DECL_INITIALIZED_IN_CLASS_P (field))
5361 error ("duplicate initialization of %qD", decl);
5362 field = duplicate_decls (decl, field,
5363 /*newdecl_is_friend=*/false);
5364 if (field == error_mark_node)
5365 return error_mark_node;
5366 else if (field)
5367 decl = field;
5368 }
5369 }
5370 else
5371 {
5372 tree field = check_classfn (context, decl,
5373 this_tmpl
5374 ? current_template_parms
5375 : NULL_TREE);
5376 if (field && field != error_mark_node
5377 && duplicate_decls (decl, field,
5378 /*newdecl_is_friend=*/false))
5379 decl = field;
5380 }
5381
5382 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
5383 DECL_IN_AGGR_P (decl) = 0;
5384 /* Do not mark DECL as an explicit specialization if it was not
5385 already marked as an instantiation; a declaration should
5386 never be marked as a specialization unless we know what
5387 template is being specialized. */
5388 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
5389 {
5390 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
5391 if (TREE_CODE (decl) == FUNCTION_DECL)
5392 DECL_COMDAT (decl) = (TREE_PUBLIC (decl)
5393 && DECL_DECLARED_INLINE_P (decl));
5394 else
5395 DECL_COMDAT (decl) = false;
5396
5397 /* [temp.expl.spec] An explicit specialization of a static data
5398 member of a template is a definition if the declaration
5399 includes an initializer; otherwise, it is a declaration.
5400
5401 We check for processing_specialization so this only applies
5402 to the new specialization syntax. */
5403 if (!initialized && processing_specialization)
5404 DECL_EXTERNAL (decl) = 1;
5405 }
5406
5407 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl)
5408 /* Aliases are definitions. */
5409 && !alias)
5410 permerror (declarator->id_loc,
5411 "declaration of %q#D outside of class is not definition",
5412 decl);
5413 }
5414
5415 was_public = TREE_PUBLIC (decl);
5416
5417 /* Enter this declaration into the symbol table. Don't push the plain
5418 VAR_DECL for a variable template. */
5419 if (!template_parm_scope_p ()
5420 || !VAR_P (decl))
5421 decl = maybe_push_decl (decl);
5422
5423 if (processing_template_decl)
5424 {
5425 /* Make sure that for a `constinit' decl push_template_decl creates
5426 a DECL_TEMPLATE_INFO info for us, so that cp_finish_decl can then set
5427 TINFO_VAR_DECLARED_CONSTINIT. */
5428 if (decl_spec_seq_has_spec_p (declspecs, ds_constinit))
5429 retrofit_lang_decl (decl);
5430 decl = push_template_decl (decl);
5431 }
5432 if (decl == error_mark_node)
5433 return error_mark_node;
5434
5435 if (VAR_P (decl)
5436 && DECL_NAMESPACE_SCOPE_P (decl) && !TREE_PUBLIC (decl) && !was_public
5437 && !DECL_THIS_STATIC (decl) && !DECL_ARTIFICIAL (decl))
5438 {
5439 /* This is a const variable with implicit 'static'. Set
5440 DECL_THIS_STATIC so we can tell it from variables that are
5441 !TREE_PUBLIC because of the anonymous namespace. */
5442 gcc_assert (CP_TYPE_CONST_P (TREE_TYPE (decl)) || errorcount);
5443 DECL_THIS_STATIC (decl) = 1;
5444 }
5445
5446 if (current_function_decl && VAR_P (decl)
5447 && DECL_DECLARED_CONSTEXPR_P (current_function_decl))
5448 {
5449 bool ok = false;
5450 if (CP_DECL_THREAD_LOCAL_P (decl) && !DECL_REALLY_EXTERN (decl))
5451 error_at (DECL_SOURCE_LOCATION (decl),
5452 "%qD declared %<thread_local%> in %qs function", decl,
5453 DECL_IMMEDIATE_FUNCTION_P (current_function_decl)
5454 ? "consteval" : "constexpr");
5455 else if (TREE_STATIC (decl))
5456 error_at (DECL_SOURCE_LOCATION (decl),
5457 "%qD declared %<static%> in %qs function", decl,
5458 DECL_IMMEDIATE_FUNCTION_P (current_function_decl)
5459 ? "consteval" : "constexpr");
5460 else
5461 ok = true;
5462 if (!ok)
5463 cp_function_chain->invalid_constexpr = true;
5464 }
5465
5466 if (!processing_template_decl && VAR_P (decl))
5467 start_decl_1 (decl, initialized);
5468
5469 return decl;
5470 }
5471
5472 /* Process the declaration of a variable DECL. INITIALIZED is true
5473 iff DECL is explicitly initialized. (INITIALIZED is false if the
5474 variable is initialized via an implicitly-called constructor.)
5475 This function must be called for ordinary variables (including, for
5476 example, implicit instantiations of templates), but must not be
5477 called for template declarations. */
5478
5479 void
start_decl_1(tree decl,bool initialized)5480 start_decl_1 (tree decl, bool initialized)
5481 {
5482 tree type;
5483 bool complete_p;
5484 bool aggregate_definition_p;
5485
5486 gcc_assert (!processing_template_decl);
5487
5488 if (error_operand_p (decl))
5489 return;
5490
5491 gcc_assert (VAR_P (decl));
5492
5493 type = TREE_TYPE (decl);
5494 complete_p = COMPLETE_TYPE_P (type);
5495 aggregate_definition_p = MAYBE_CLASS_TYPE_P (type) && !DECL_EXTERNAL (decl);
5496
5497 /* If an explicit initializer is present, or if this is a definition
5498 of an aggregate, then we need a complete type at this point.
5499 (Scalars are always complete types, so there is nothing to
5500 check.) This code just sets COMPLETE_P; errors (if necessary)
5501 are issued below. */
5502 if ((initialized || aggregate_definition_p)
5503 && !complete_p
5504 && COMPLETE_TYPE_P (complete_type (type)))
5505 {
5506 complete_p = true;
5507 /* We will not yet have set TREE_READONLY on DECL if the type
5508 was "const", but incomplete, before this point. But, now, we
5509 have a complete type, so we can try again. */
5510 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
5511 }
5512
5513 if (is_global_var (decl))
5514 {
5515 type_context_kind context = (DECL_THREAD_LOCAL_P (decl)
5516 ? TCTX_THREAD_STORAGE
5517 : TCTX_STATIC_STORAGE);
5518 verify_type_context (input_location, context, TREE_TYPE (decl));
5519 }
5520 if (initialized)
5521 /* Is it valid for this decl to have an initializer at all? */
5522 {
5523 /* Don't allow initializations for incomplete types except for
5524 arrays which might be completed by the initialization. */
5525 if (complete_p)
5526 ; /* A complete type is ok. */
5527 else if (type_uses_auto (type))
5528 ; /* An auto type is ok. */
5529 else if (TREE_CODE (type) != ARRAY_TYPE)
5530 {
5531 error ("variable %q#D has initializer but incomplete type", decl);
5532 type = TREE_TYPE (decl) = error_mark_node;
5533 }
5534 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
5535 {
5536 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
5537 error ("elements of array %q#D have incomplete type", decl);
5538 /* else we already gave an error in start_decl. */
5539 }
5540 }
5541 else if (aggregate_definition_p && !complete_p)
5542 {
5543 if (type_uses_auto (type))
5544 gcc_assert (CLASS_PLACEHOLDER_TEMPLATE (type));
5545 else
5546 {
5547 error ("aggregate %q#D has incomplete type and cannot be defined",
5548 decl);
5549 /* Change the type so that assemble_variable will give
5550 DECL an rtl we can live with: (mem (const_int 0)). */
5551 type = TREE_TYPE (decl) = error_mark_node;
5552 }
5553 }
5554
5555 /* Create a new scope to hold this declaration if necessary.
5556 Whether or not a new scope is necessary cannot be determined
5557 until after the type has been completed; if the type is a
5558 specialization of a class template it is not until after
5559 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
5560 will be set correctly. */
5561 maybe_push_cleanup_level (type);
5562 }
5563
5564 /* Handle initialization of references. DECL, TYPE, and INIT have the
5565 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
5566 but will be set to a new CLEANUP_STMT if a temporary is created
5567 that must be destroyed subsequently.
5568
5569 Returns an initializer expression to use to initialize DECL, or
5570 NULL if the initialization can be performed statically.
5571
5572 Quotes on semantics can be found in ARM 8.4.3. */
5573
5574 static tree
grok_reference_init(tree decl,tree type,tree init,int flags)5575 grok_reference_init (tree decl, tree type, tree init, int flags)
5576 {
5577 if (init == NULL_TREE)
5578 {
5579 if ((DECL_LANG_SPECIFIC (decl) == 0
5580 || DECL_IN_AGGR_P (decl) == 0)
5581 && ! DECL_THIS_EXTERN (decl))
5582 error_at (DECL_SOURCE_LOCATION (decl),
5583 "%qD declared as reference but not initialized", decl);
5584 return NULL_TREE;
5585 }
5586
5587 tree ttype = TREE_TYPE (type);
5588 if (TREE_CODE (init) == TREE_LIST)
5589 {
5590 /* This handles (C++20 only) code like
5591
5592 const A& r(1, 2, 3);
5593
5594 where we treat the parenthesized list as a CONSTRUCTOR. */
5595 if (TREE_TYPE (init) == NULL_TREE
5596 && CP_AGGREGATE_TYPE_P (ttype)
5597 && !DECL_DECOMPOSITION_P (decl)
5598 && (cxx_dialect >= cxx2a))
5599 {
5600 /* We don't know yet if we should treat const A& r(1) as
5601 const A& r{1}. */
5602 if (list_length (init) == 1)
5603 {
5604 flags |= LOOKUP_AGGREGATE_PAREN_INIT;
5605 init = build_x_compound_expr_from_list (init, ELK_INIT,
5606 tf_warning_or_error);
5607 }
5608 /* If the list had more than one element, the code is ill-formed
5609 pre-C++20, so we can build a constructor right away. */
5610 else
5611 {
5612 init = build_constructor_from_list (init_list_type_node, init);
5613 CONSTRUCTOR_IS_DIRECT_INIT (init) = true;
5614 CONSTRUCTOR_IS_PAREN_INIT (init) = true;
5615 }
5616 }
5617 else
5618 init = build_x_compound_expr_from_list (init, ELK_INIT,
5619 tf_warning_or_error);
5620 }
5621
5622 if (TREE_CODE (ttype) != ARRAY_TYPE
5623 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
5624 /* Note: default conversion is only called in very special cases. */
5625 init = decay_conversion (init, tf_warning_or_error);
5626
5627 /* check_initializer handles this for non-reference variables, but for
5628 references we need to do it here or the initializer will get the
5629 incomplete array type and confuse later calls to
5630 cp_complete_array_type. */
5631 if (TREE_CODE (ttype) == ARRAY_TYPE
5632 && TYPE_DOMAIN (ttype) == NULL_TREE
5633 && (BRACE_ENCLOSED_INITIALIZER_P (init)
5634 || TREE_CODE (init) == STRING_CST))
5635 {
5636 cp_complete_array_type (&ttype, init, false);
5637 if (ttype != TREE_TYPE (type))
5638 type = cp_build_reference_type (ttype, TYPE_REF_IS_RVALUE (type));
5639 }
5640
5641 /* Convert INIT to the reference type TYPE. This may involve the
5642 creation of a temporary, whose lifetime must be the same as that
5643 of the reference. If so, a DECL_EXPR for the temporary will be
5644 added just after the DECL_EXPR for DECL. That's why we don't set
5645 DECL_INITIAL for local references (instead assigning to them
5646 explicitly); we need to allow the temporary to be initialized
5647 first. */
5648 return initialize_reference (type, init, flags,
5649 tf_warning_or_error);
5650 }
5651
5652 /* Designated initializers in arrays are not supported in GNU C++.
5653 The parser cannot detect this error since it does not know whether
5654 a given brace-enclosed initializer is for a class type or for an
5655 array. This function checks that CE does not use a designated
5656 initializer. If it does, an error is issued. Returns true if CE
5657 is valid, i.e., does not have a designated initializer. */
5658
5659 bool
check_array_designated_initializer(constructor_elt * ce,unsigned HOST_WIDE_INT index)5660 check_array_designated_initializer (constructor_elt *ce,
5661 unsigned HOST_WIDE_INT index)
5662 {
5663 /* Designated initializers for array elements are not supported. */
5664 if (ce->index)
5665 {
5666 /* The parser only allows identifiers as designated
5667 initializers. */
5668 if (ce->index == error_mark_node)
5669 {
5670 error ("name used in a GNU-style designated "
5671 "initializer for an array");
5672 return false;
5673 }
5674 else if (identifier_p (ce->index))
5675 {
5676 error ("name %qD used in a GNU-style designated "
5677 "initializer for an array", ce->index);
5678 return false;
5679 }
5680
5681 tree ce_index = build_expr_type_conversion (WANT_INT | WANT_ENUM,
5682 ce->index, true);
5683 if (ce_index
5684 && INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (ce_index))
5685 && (TREE_CODE (ce_index = fold_non_dependent_expr (ce_index))
5686 == INTEGER_CST))
5687 {
5688 /* A C99 designator is OK if it matches the current index. */
5689 if (wi::to_wide (ce_index) == index)
5690 {
5691 ce->index = ce_index;
5692 return true;
5693 }
5694 else
5695 sorry ("non-trivial designated initializers not supported");
5696 }
5697 else
5698 error_at (cp_expr_loc_or_input_loc (ce->index),
5699 "C99 designator %qE is not an integral constant-expression",
5700 ce->index);
5701
5702 return false;
5703 }
5704
5705 return true;
5706 }
5707
5708 /* When parsing `int a[] = {1, 2};' we don't know the size of the
5709 array until we finish parsing the initializer. If that's the
5710 situation we're in, update DECL accordingly. */
5711
5712 static void
maybe_deduce_size_from_array_init(tree decl,tree init)5713 maybe_deduce_size_from_array_init (tree decl, tree init)
5714 {
5715 tree type = TREE_TYPE (decl);
5716
5717 if (TREE_CODE (type) == ARRAY_TYPE
5718 && TYPE_DOMAIN (type) == NULL_TREE
5719 && TREE_CODE (decl) != TYPE_DECL)
5720 {
5721 /* do_default is really a C-ism to deal with tentative definitions.
5722 But let's leave it here to ease the eventual merge. */
5723 int do_default = !DECL_EXTERNAL (decl);
5724 tree initializer = init ? init : DECL_INITIAL (decl);
5725 int failure = 0;
5726
5727 /* Check that there are no designated initializers in INIT, as
5728 those are not supported in GNU C++, and as the middle-end
5729 will crash if presented with a non-numeric designated
5730 initializer. */
5731 if (initializer && BRACE_ENCLOSED_INITIALIZER_P (initializer))
5732 {
5733 vec<constructor_elt, va_gc> *v = CONSTRUCTOR_ELTS (initializer);
5734 constructor_elt *ce;
5735 HOST_WIDE_INT i;
5736 FOR_EACH_VEC_SAFE_ELT (v, i, ce)
5737 {
5738 if (instantiation_dependent_expression_p (ce->index))
5739 return;
5740 if (!check_array_designated_initializer (ce, i))
5741 failure = 1;
5742 }
5743 }
5744
5745 if (failure)
5746 TREE_TYPE (decl) = error_mark_node;
5747 else
5748 {
5749 failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
5750 do_default);
5751 if (failure == 1)
5752 {
5753 error_at (cp_expr_loc_or_loc (initializer,
5754 DECL_SOURCE_LOCATION (decl)),
5755 "initializer fails to determine size of %qD", decl);
5756 }
5757 else if (failure == 2)
5758 {
5759 if (do_default)
5760 {
5761 error_at (DECL_SOURCE_LOCATION (decl),
5762 "array size missing in %qD", decl);
5763 }
5764 /* If a `static' var's size isn't known, make it extern as
5765 well as static, so it does not get allocated. If it's not
5766 `static', then don't mark it extern; finish_incomplete_decl
5767 will give it a default size and it will get allocated. */
5768 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
5769 DECL_EXTERNAL (decl) = 1;
5770 }
5771 else if (failure == 3)
5772 {
5773 error_at (DECL_SOURCE_LOCATION (decl),
5774 "zero-size array %qD", decl);
5775 }
5776 }
5777
5778 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
5779
5780 relayout_decl (decl);
5781 }
5782 }
5783
5784 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
5785 any appropriate error messages regarding the layout. */
5786
5787 static void
layout_var_decl(tree decl)5788 layout_var_decl (tree decl)
5789 {
5790 tree type;
5791
5792 type = TREE_TYPE (decl);
5793 if (type == error_mark_node)
5794 return;
5795
5796 /* If we haven't already laid out this declaration, do so now.
5797 Note that we must not call complete type for an external object
5798 because it's type might involve templates that we are not
5799 supposed to instantiate yet. (And it's perfectly valid to say
5800 `extern X x' for some incomplete type `X'.) */
5801 if (!DECL_EXTERNAL (decl))
5802 complete_type (type);
5803 if (!DECL_SIZE (decl)
5804 && TREE_TYPE (decl) != error_mark_node
5805 && complete_or_array_type_p (type))
5806 layout_decl (decl, 0);
5807
5808 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
5809 {
5810 /* An automatic variable with an incomplete type: that is an error.
5811 Don't talk about array types here, since we took care of that
5812 message in grokdeclarator. */
5813 error_at (DECL_SOURCE_LOCATION (decl),
5814 "storage size of %qD isn%'t known", decl);
5815 TREE_TYPE (decl) = error_mark_node;
5816 }
5817 #if 0
5818 /* Keep this code around in case we later want to control debug info
5819 based on whether a type is "used". (jason 1999-11-11) */
5820
5821 else if (!DECL_EXTERNAL (decl) && MAYBE_CLASS_TYPE_P (ttype))
5822 /* Let debugger know it should output info for this type. */
5823 note_debug_info_needed (ttype);
5824
5825 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
5826 note_debug_info_needed (DECL_CONTEXT (decl));
5827 #endif
5828
5829 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
5830 && DECL_SIZE (decl) != NULL_TREE
5831 && ! TREE_CONSTANT (DECL_SIZE (decl)))
5832 {
5833 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
5834 constant_expression_warning (DECL_SIZE (decl));
5835 else
5836 {
5837 error_at (DECL_SOURCE_LOCATION (decl),
5838 "storage size of %qD isn%'t constant", decl);
5839 TREE_TYPE (decl) = error_mark_node;
5840 type = error_mark_node;
5841 }
5842 }
5843
5844 /* If the final element initializes a flexible array field, add the size of
5845 that initializer to DECL's size. */
5846 if (type != error_mark_node
5847 && DECL_INITIAL (decl)
5848 && TREE_CODE (DECL_INITIAL (decl)) == CONSTRUCTOR
5849 && !vec_safe_is_empty (CONSTRUCTOR_ELTS (DECL_INITIAL (decl)))
5850 && DECL_SIZE (decl) != NULL_TREE
5851 && TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST
5852 && TYPE_SIZE (type) != NULL_TREE
5853 && TREE_CODE (TYPE_SIZE (type)) == INTEGER_CST
5854 && tree_int_cst_equal (DECL_SIZE (decl), TYPE_SIZE (type)))
5855 {
5856 constructor_elt &elt = CONSTRUCTOR_ELTS (DECL_INITIAL (decl))->last ();
5857 if (elt.index)
5858 {
5859 tree itype = TREE_TYPE (elt.index);
5860 tree vtype = TREE_TYPE (elt.value);
5861 if (TREE_CODE (itype) == ARRAY_TYPE
5862 && TYPE_DOMAIN (itype) == NULL
5863 && TREE_CODE (vtype) == ARRAY_TYPE
5864 && COMPLETE_TYPE_P (vtype))
5865 {
5866 DECL_SIZE (decl)
5867 = size_binop (PLUS_EXPR, DECL_SIZE (decl), TYPE_SIZE (vtype));
5868 DECL_SIZE_UNIT (decl)
5869 = size_binop (PLUS_EXPR, DECL_SIZE_UNIT (decl),
5870 TYPE_SIZE_UNIT (vtype));
5871 }
5872 }
5873 }
5874 }
5875
5876 /* If a local static variable is declared in an inline function, or if
5877 we have a weak definition, we must endeavor to create only one
5878 instance of the variable at link-time. */
5879
5880 void
maybe_commonize_var(tree decl)5881 maybe_commonize_var (tree decl)
5882 {
5883 /* Don't mess with __FUNCTION__ and similar. */
5884 if (DECL_ARTIFICIAL (decl))
5885 return;
5886
5887 /* Static data in a function with comdat linkage also has comdat
5888 linkage. */
5889 if ((TREE_STATIC (decl)
5890 && DECL_FUNCTION_SCOPE_P (decl)
5891 && vague_linkage_p (DECL_CONTEXT (decl)))
5892 || (TREE_PUBLIC (decl) && DECL_INLINE_VAR_P (decl)))
5893 {
5894 if (flag_weak)
5895 {
5896 /* With weak symbols, we simply make the variable COMDAT;
5897 that will cause copies in multiple translations units to
5898 be merged. */
5899 comdat_linkage (decl);
5900 }
5901 else
5902 {
5903 if (DECL_INITIAL (decl) == NULL_TREE
5904 || DECL_INITIAL (decl) == error_mark_node)
5905 {
5906 /* Without weak symbols, we can use COMMON to merge
5907 uninitialized variables. */
5908 TREE_PUBLIC (decl) = 1;
5909 DECL_COMMON (decl) = 1;
5910 }
5911 else
5912 {
5913 /* While for initialized variables, we must use internal
5914 linkage -- which means that multiple copies will not
5915 be merged. */
5916 TREE_PUBLIC (decl) = 0;
5917 DECL_COMMON (decl) = 0;
5918 DECL_INTERFACE_KNOWN (decl) = 1;
5919 const char *msg;
5920 if (DECL_INLINE_VAR_P (decl))
5921 msg = G_("sorry: semantics of inline variable "
5922 "%q#D are wrong (you%'ll wind up with "
5923 "multiple copies)");
5924 else
5925 msg = G_("sorry: semantics of inline function "
5926 "static data %q#D are wrong (you%'ll wind "
5927 "up with multiple copies)");
5928 if (warning_at (DECL_SOURCE_LOCATION (decl), 0,
5929 msg, decl))
5930 inform (DECL_SOURCE_LOCATION (decl),
5931 "you can work around this by removing the initializer");
5932 }
5933 }
5934 }
5935 }
5936
5937 /* Issue an error message if DECL is an uninitialized const variable.
5938 CONSTEXPR_CONTEXT_P is true when the function is called in a constexpr
5939 context from potential_constant_expression. Returns true if all is well,
5940 false otherwise. */
5941
5942 bool
check_for_uninitialized_const_var(tree decl,bool constexpr_context_p,tsubst_flags_t complain)5943 check_for_uninitialized_const_var (tree decl, bool constexpr_context_p,
5944 tsubst_flags_t complain)
5945 {
5946 tree type = strip_array_types (TREE_TYPE (decl));
5947
5948 /* ``Unless explicitly declared extern, a const object does not have
5949 external linkage and must be initialized. ($8.4; $12.1)'' ARM
5950 7.1.6 */
5951 if (VAR_P (decl)
5952 && !TYPE_REF_P (type)
5953 && (CP_TYPE_CONST_P (type)
5954 /* C++20 permits trivial default initialization in constexpr
5955 context (P1331R2). */
5956 || (cxx_dialect < cxx2a
5957 && (constexpr_context_p
5958 || var_in_constexpr_fn (decl))))
5959 && !DECL_NONTRIVIALLY_INITIALIZED_P (decl))
5960 {
5961 tree field = default_init_uninitialized_part (type);
5962 if (!field)
5963 return true;
5964
5965 bool show_notes = true;
5966
5967 if (!constexpr_context_p || cxx_dialect >= cxx2a)
5968 {
5969 if (CP_TYPE_CONST_P (type))
5970 {
5971 if (complain & tf_error)
5972 show_notes = permerror (DECL_SOURCE_LOCATION (decl),
5973 "uninitialized %<const %D%>", decl);
5974 }
5975 else
5976 {
5977 if (!is_instantiation_of_constexpr (current_function_decl)
5978 && (complain & tf_error))
5979 error_at (DECL_SOURCE_LOCATION (decl),
5980 "uninitialized variable %qD in %<constexpr%> "
5981 "function", decl);
5982 else
5983 show_notes = false;
5984 cp_function_chain->invalid_constexpr = true;
5985 }
5986 }
5987 else if (complain & tf_error)
5988 error_at (DECL_SOURCE_LOCATION (decl),
5989 "uninitialized variable %qD in %<constexpr%> context",
5990 decl);
5991
5992 if (show_notes && CLASS_TYPE_P (type) && (complain & tf_error))
5993 {
5994 tree defaulted_ctor;
5995
5996 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (type)),
5997 "%q#T has no user-provided default constructor", type);
5998 defaulted_ctor = in_class_defaulted_default_constructor (type);
5999 if (defaulted_ctor)
6000 inform (DECL_SOURCE_LOCATION (defaulted_ctor),
6001 "constructor is not user-provided because it is "
6002 "explicitly defaulted in the class body");
6003 inform (DECL_SOURCE_LOCATION (field),
6004 "and the implicitly-defined constructor does not "
6005 "initialize %q#D", field);
6006 }
6007
6008 return false;
6009 }
6010
6011 return true;
6012 }
6013
6014 /* Structure holding the current initializer being processed by reshape_init.
6015 CUR is a pointer to the current element being processed, END is a pointer
6016 after the last element present in the initializer. */
6017 struct reshape_iter
6018 {
6019 constructor_elt *cur;
6020 constructor_elt *end;
6021 };
6022
6023 static tree reshape_init_r (tree, reshape_iter *, tree, tsubst_flags_t);
6024
6025 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
6026 returned is the next FIELD_DECL (possibly FIELD itself) that can be
6027 initialized. If there are no more such fields, the return value
6028 will be NULL. */
6029
6030 tree
next_initializable_field(tree field)6031 next_initializable_field (tree field)
6032 {
6033 while (field
6034 && (TREE_CODE (field) != FIELD_DECL
6035 || DECL_UNNAMED_BIT_FIELD (field)
6036 || (DECL_ARTIFICIAL (field)
6037 /* In C++17, don't skip base class fields. */
6038 && !(cxx_dialect >= cxx17 && DECL_FIELD_IS_BASE (field))
6039 /* Don't skip vptr fields. We might see them when we're
6040 called from reduced_constant_expression_p. */
6041 && !DECL_VIRTUAL_P (field))))
6042 field = DECL_CHAIN (field);
6043
6044 return field;
6045 }
6046
6047 /* Return true for [dcl.init.list] direct-list-initialization from
6048 single element of enumeration with a fixed underlying type. */
6049
6050 bool
is_direct_enum_init(tree type,tree init)6051 is_direct_enum_init (tree type, tree init)
6052 {
6053 if (cxx_dialect >= cxx17
6054 && TREE_CODE (type) == ENUMERAL_TYPE
6055 && ENUM_FIXED_UNDERLYING_TYPE_P (type)
6056 && TREE_CODE (init) == CONSTRUCTOR
6057 && CONSTRUCTOR_IS_DIRECT_INIT (init)
6058 && CONSTRUCTOR_NELTS (init) == 1)
6059 return true;
6060 return false;
6061 }
6062
6063 /* Subroutine of reshape_init_array and reshape_init_vector, which does
6064 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
6065 INTEGER_CST representing the size of the array minus one (the maximum index),
6066 or NULL_TREE if the array was declared without specifying the size. D is
6067 the iterator within the constructor. */
6068
6069 static tree
reshape_init_array_1(tree elt_type,tree max_index,reshape_iter * d,tree first_initializer_p,tsubst_flags_t complain)6070 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d,
6071 tree first_initializer_p, tsubst_flags_t complain)
6072 {
6073 tree new_init;
6074 bool sized_array_p = (max_index && TREE_CONSTANT (max_index));
6075 unsigned HOST_WIDE_INT max_index_cst = 0;
6076 unsigned HOST_WIDE_INT index;
6077
6078 /* The initializer for an array is always a CONSTRUCTOR. If this is the
6079 outermost CONSTRUCTOR and the element type is non-aggregate, we don't need
6080 to build a new one. But don't reuse if not complaining; if this is
6081 tentative, we might also reshape to another type (95319). */
6082 bool reuse = (first_initializer_p
6083 && (complain & tf_error)
6084 && !CP_AGGREGATE_TYPE_P (elt_type)
6085 && !TREE_SIDE_EFFECTS (first_initializer_p));
6086 if (reuse)
6087 new_init = first_initializer_p;
6088 else
6089 new_init = build_constructor (init_list_type_node, NULL);
6090
6091 if (sized_array_p)
6092 {
6093 /* Minus 1 is used for zero sized arrays. */
6094 if (integer_all_onesp (max_index))
6095 return new_init;
6096
6097 if (tree_fits_uhwi_p (max_index))
6098 max_index_cst = tree_to_uhwi (max_index);
6099 /* sizetype is sign extended, not zero extended. */
6100 else
6101 max_index_cst = tree_to_uhwi (fold_convert (size_type_node, max_index));
6102 }
6103
6104 /* Loop until there are no more initializers. */
6105 for (index = 0;
6106 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
6107 ++index)
6108 {
6109 tree elt_init;
6110 constructor_elt *old_cur = d->cur;
6111
6112 check_array_designated_initializer (d->cur, index);
6113 elt_init = reshape_init_r (elt_type, d,
6114 /*first_initializer_p=*/NULL_TREE,
6115 complain);
6116 if (elt_init == error_mark_node)
6117 return error_mark_node;
6118 tree idx = size_int (index);
6119 if (reuse)
6120 {
6121 old_cur->index = idx;
6122 old_cur->value = elt_init;
6123 }
6124 else
6125 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init),
6126 idx, elt_init);
6127 if (!TREE_CONSTANT (elt_init))
6128 TREE_CONSTANT (new_init) = false;
6129
6130 /* This can happen with an invalid initializer (c++/54501). */
6131 if (d->cur == old_cur && !sized_array_p)
6132 break;
6133 }
6134
6135 return new_init;
6136 }
6137
6138 /* Subroutine of reshape_init_r, processes the initializers for arrays.
6139 Parameters are the same of reshape_init_r. */
6140
6141 static tree
reshape_init_array(tree type,reshape_iter * d,tree first_initializer_p,tsubst_flags_t complain)6142 reshape_init_array (tree type, reshape_iter *d, tree first_initializer_p,
6143 tsubst_flags_t complain)
6144 {
6145 tree max_index = NULL_TREE;
6146
6147 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
6148
6149 if (TYPE_DOMAIN (type))
6150 max_index = array_type_nelts (type);
6151
6152 return reshape_init_array_1 (TREE_TYPE (type), max_index, d,
6153 first_initializer_p, complain);
6154 }
6155
6156 /* Subroutine of reshape_init_r, processes the initializers for vectors.
6157 Parameters are the same of reshape_init_r. */
6158
6159 static tree
reshape_init_vector(tree type,reshape_iter * d,tsubst_flags_t complain)6160 reshape_init_vector (tree type, reshape_iter *d, tsubst_flags_t complain)
6161 {
6162 tree max_index = NULL_TREE;
6163
6164 gcc_assert (VECTOR_TYPE_P (type));
6165
6166 if (COMPOUND_LITERAL_P (d->cur->value))
6167 {
6168 tree value = d->cur->value;
6169 if (!same_type_p (TREE_TYPE (value), type))
6170 {
6171 if (complain & tf_error)
6172 error ("invalid type %qT as initializer for a vector of type %qT",
6173 TREE_TYPE (d->cur->value), type);
6174 value = error_mark_node;
6175 }
6176 ++d->cur;
6177 return value;
6178 }
6179
6180 /* For a vector, we initialize it as an array of the appropriate size. */
6181 if (VECTOR_TYPE_P (type))
6182 max_index = size_int (TYPE_VECTOR_SUBPARTS (type) - 1);
6183
6184 return reshape_init_array_1 (TREE_TYPE (type), max_index, d,
6185 NULL_TREE, complain);
6186 }
6187
6188 /* Subroutine of reshape_init_r, processes the initializers for classes
6189 or union. Parameters are the same of reshape_init_r. */
6190
6191 static tree
reshape_init_class(tree type,reshape_iter * d,bool first_initializer_p,tsubst_flags_t complain)6192 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p,
6193 tsubst_flags_t complain)
6194 {
6195 tree field;
6196 tree new_init;
6197
6198 gcc_assert (CLASS_TYPE_P (type));
6199
6200 /* The initializer for a class is always a CONSTRUCTOR. */
6201 new_init = build_constructor (init_list_type_node, NULL);
6202 field = next_initializable_field (TYPE_FIELDS (type));
6203
6204 if (!field)
6205 {
6206 /* [dcl.init.aggr]
6207
6208 An initializer for an aggregate member that is an
6209 empty class shall have the form of an empty
6210 initializer-list {}. */
6211 if (!first_initializer_p)
6212 {
6213 if (complain & tf_error)
6214 error ("initializer for %qT must be brace-enclosed", type);
6215 return error_mark_node;
6216 }
6217 return new_init;
6218 }
6219
6220 /* Loop through the initializable fields, gathering initializers. */
6221 while (d->cur != d->end)
6222 {
6223 tree field_init;
6224 constructor_elt *old_cur = d->cur;
6225
6226 /* Handle designated initializers, as an extension. */
6227 if (d->cur->index)
6228 {
6229 if (d->cur->index == error_mark_node)
6230 return error_mark_node;
6231
6232 if (TREE_CODE (d->cur->index) == FIELD_DECL)
6233 {
6234 /* We already reshaped this. */
6235 if (field != d->cur->index)
6236 {
6237 tree id = DECL_NAME (d->cur->index);
6238 gcc_assert (id);
6239 gcc_checking_assert (d->cur->index
6240 == get_class_binding (type, id));
6241 field = d->cur->index;
6242 }
6243 }
6244 else if (TREE_CODE (d->cur->index) == IDENTIFIER_NODE)
6245 field = get_class_binding (type, d->cur->index);
6246 else
6247 {
6248 if (complain & tf_error)
6249 error ("%<[%E] =%> used in a GNU-style designated initializer"
6250 " for class %qT", d->cur->index, type);
6251 return error_mark_node;
6252 }
6253
6254 if (!field || TREE_CODE (field) != FIELD_DECL)
6255 {
6256 if (complain & tf_error)
6257 error ("%qT has no non-static data member named %qD", type,
6258 d->cur->index);
6259 return error_mark_node;
6260 }
6261 }
6262
6263 /* If we processed all the member of the class, we are done. */
6264 if (!field)
6265 break;
6266
6267 field_init = reshape_init_r (TREE_TYPE (field), d,
6268 /*first_initializer_p=*/NULL_TREE,
6269 complain);
6270 if (field_init == error_mark_node)
6271 return error_mark_node;
6272
6273 if (d->cur == old_cur && d->cur->index)
6274 {
6275 /* This can happen with an invalid initializer for a flexible
6276 array member (c++/54441). */
6277 if (complain & tf_error)
6278 error ("invalid initializer for %q#D", field);
6279 return error_mark_node;
6280 }
6281
6282 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
6283
6284 /* [dcl.init.aggr]
6285
6286 When a union is initialized with a brace-enclosed
6287 initializer, the braces shall only contain an
6288 initializer for the first member of the union. */
6289 if (TREE_CODE (type) == UNION_TYPE)
6290 break;
6291
6292 field = next_initializable_field (DECL_CHAIN (field));
6293 }
6294
6295 return new_init;
6296 }
6297
6298 /* Subroutine of reshape_init_r. We're in a context where C99 initializer
6299 designators are not valid; either complain or return true to indicate
6300 that reshape_init_r should return error_mark_node. */
6301
6302 static bool
has_designator_problem(reshape_iter * d,tsubst_flags_t complain)6303 has_designator_problem (reshape_iter *d, tsubst_flags_t complain)
6304 {
6305 if (d->cur->index)
6306 {
6307 if (complain & tf_error)
6308 error_at (cp_expr_loc_or_input_loc (d->cur->index),
6309 "C99 designator %qE outside aggregate initializer",
6310 d->cur->index);
6311 else
6312 return true;
6313 }
6314 return false;
6315 }
6316
6317 /* Subroutine of reshape_init, which processes a single initializer (part of
6318 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
6319 iterator within the CONSTRUCTOR which points to the initializer to process.
6320 If this is the first initializer of the outermost CONSTRUCTOR node,
6321 FIRST_INITIALIZER_P is that CONSTRUCTOR; otherwise, it is NULL_TREE. */
6322
6323 static tree
reshape_init_r(tree type,reshape_iter * d,tree first_initializer_p,tsubst_flags_t complain)6324 reshape_init_r (tree type, reshape_iter *d, tree first_initializer_p,
6325 tsubst_flags_t complain)
6326 {
6327 tree init = d->cur->value;
6328
6329 if (error_operand_p (init))
6330 return error_mark_node;
6331
6332 if (first_initializer_p && !CP_AGGREGATE_TYPE_P (type)
6333 && has_designator_problem (d, complain))
6334 return error_mark_node;
6335
6336 tree stripped_init = tree_strip_any_location_wrapper (init);
6337
6338 if (TREE_CODE (type) == COMPLEX_TYPE)
6339 {
6340 /* A complex type can be initialized from one or two initializers,
6341 but braces are not elided. */
6342 d->cur++;
6343 if (BRACE_ENCLOSED_INITIALIZER_P (stripped_init))
6344 {
6345 if (CONSTRUCTOR_NELTS (stripped_init) > 2)
6346 {
6347 if (complain & tf_error)
6348 error ("too many initializers for %qT", type);
6349 else
6350 return error_mark_node;
6351 }
6352 }
6353 else if (first_initializer_p && d->cur != d->end)
6354 {
6355 vec<constructor_elt, va_gc> *v = 0;
6356 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, init);
6357 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, d->cur->value);
6358 if (has_designator_problem (d, complain))
6359 return error_mark_node;
6360 d->cur++;
6361 init = build_constructor (init_list_type_node, v);
6362 }
6363 return init;
6364 }
6365
6366 /* A non-aggregate type is always initialized with a single
6367 initializer. */
6368 if (!CP_AGGREGATE_TYPE_P (type))
6369 {
6370 /* It is invalid to initialize a non-aggregate type with a
6371 brace-enclosed initializer before C++0x.
6372 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
6373 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
6374 a CONSTRUCTOR (with a record type). */
6375 if (TREE_CODE (stripped_init) == CONSTRUCTOR
6376 /* Don't complain about a capture-init. */
6377 && !CONSTRUCTOR_IS_DIRECT_INIT (stripped_init)
6378 && BRACE_ENCLOSED_INITIALIZER_P (stripped_init)) /* p7626.C */
6379 {
6380 if (SCALAR_TYPE_P (type))
6381 {
6382 if (cxx_dialect < cxx11)
6383 {
6384 if (complain & tf_error)
6385 error ("braces around scalar initializer for type %qT",
6386 type);
6387 init = error_mark_node;
6388 }
6389 else if (first_initializer_p
6390 || (CONSTRUCTOR_NELTS (stripped_init) > 0
6391 && (BRACE_ENCLOSED_INITIALIZER_P
6392 (CONSTRUCTOR_ELT (stripped_init,0)->value))))
6393 {
6394 if (complain & tf_error)
6395 error ("too many braces around scalar initializer "
6396 "for type %qT", type);
6397 init = error_mark_node;
6398 }
6399 }
6400 else
6401 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
6402 }
6403
6404 d->cur++;
6405 return init;
6406 }
6407
6408 /* "If T is a class type and the initializer list has a single element of
6409 type cv U, where U is T or a class derived from T, the object is
6410 initialized from that element." Even if T is an aggregate. */
6411 if (cxx_dialect >= cxx11 && (CLASS_TYPE_P (type) || VECTOR_TYPE_P (type))
6412 && first_initializer_p
6413 && d->end - d->cur == 1
6414 && reference_related_p (type, TREE_TYPE (init)))
6415 {
6416 d->cur++;
6417 return init;
6418 }
6419
6420 /* [dcl.init.aggr]
6421
6422 All implicit type conversions (clause _conv_) are considered when
6423 initializing the aggregate member with an initializer from an
6424 initializer-list. If the initializer can initialize a member,
6425 the member is initialized. Otherwise, if the member is itself a
6426 non-empty subaggregate, brace elision is assumed and the
6427 initializer is considered for the initialization of the first
6428 member of the subaggregate. */
6429 if ((TREE_CODE (init) != CONSTRUCTOR || COMPOUND_LITERAL_P (init))
6430 /* But don't try this for the first initializer, since that would be
6431 looking through the outermost braces; A a2 = { a1 }; is not a
6432 valid aggregate initialization. */
6433 && !first_initializer_p
6434 && (same_type_ignoring_top_level_qualifiers_p (type, TREE_TYPE (init))
6435 || can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL,
6436 complain)))
6437 {
6438 d->cur++;
6439 return init;
6440 }
6441
6442 /* [dcl.init.string]
6443
6444 A char array (whether plain char, signed char, or unsigned char)
6445 can be initialized by a string-literal (optionally enclosed in
6446 braces); a wchar_t array can be initialized by a wide
6447 string-literal (optionally enclosed in braces). */
6448 if (TREE_CODE (type) == ARRAY_TYPE
6449 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
6450 {
6451 tree str_init = init;
6452 tree stripped_str_init = stripped_init;
6453
6454 /* Strip one level of braces if and only if they enclose a single
6455 element (as allowed by [dcl.init.string]). */
6456 if (!first_initializer_p
6457 && TREE_CODE (stripped_str_init) == CONSTRUCTOR
6458 && CONSTRUCTOR_NELTS (stripped_str_init) == 1)
6459 {
6460 str_init = (*CONSTRUCTOR_ELTS (stripped_str_init))[0].value;
6461 stripped_str_init = tree_strip_any_location_wrapper (str_init);
6462 }
6463
6464 /* If it's a string literal, then it's the initializer for the array
6465 as a whole. Otherwise, continue with normal initialization for
6466 array types (one value per array element). */
6467 if (TREE_CODE (stripped_str_init) == STRING_CST)
6468 {
6469 if (has_designator_problem (d, complain))
6470 return error_mark_node;
6471 d->cur++;
6472 return str_init;
6473 }
6474 }
6475
6476 /* The following cases are about aggregates. If we are not within a full
6477 initializer already, and there is not a CONSTRUCTOR, it means that there
6478 is a missing set of braces (that is, we are processing the case for
6479 which reshape_init exists). */
6480 if (!first_initializer_p)
6481 {
6482 if (TREE_CODE (stripped_init) == CONSTRUCTOR)
6483 {
6484 tree init_type = TREE_TYPE (init);
6485 if (init_type && TYPE_PTRMEMFUNC_P (init_type))
6486 /* There is no need to call reshape_init for pointer-to-member
6487 function initializers, as they are always constructed correctly
6488 by the front end. Here we have e.g. {.__pfn=0B, .__delta=0},
6489 which is missing outermost braces. We should warn below, and
6490 one of the routines below will wrap it in additional { }. */;
6491 /* For a nested compound literal, proceed to specialized routines,
6492 to handle initialization of arrays and similar. */
6493 else if (COMPOUND_LITERAL_P (stripped_init))
6494 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (stripped_init));
6495 /* A CONSTRUCTOR of the target's type is a previously
6496 digested initializer. */
6497 else if (same_type_ignoring_top_level_qualifiers_p (type, init_type))
6498 {
6499 ++d->cur;
6500 return init;
6501 }
6502 else
6503 {
6504 /* Something that hasn't been reshaped yet. */
6505 ++d->cur;
6506 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (stripped_init));
6507 return reshape_init (type, init, complain);
6508 }
6509 }
6510
6511 if (complain & tf_warning)
6512 warning (OPT_Wmissing_braces,
6513 "missing braces around initializer for %qT",
6514 type);
6515 }
6516
6517 /* Dispatch to specialized routines. */
6518 if (CLASS_TYPE_P (type))
6519 return reshape_init_class (type, d, first_initializer_p, complain);
6520 else if (TREE_CODE (type) == ARRAY_TYPE)
6521 return reshape_init_array (type, d, first_initializer_p, complain);
6522 else if (VECTOR_TYPE_P (type))
6523 return reshape_init_vector (type, d, complain);
6524 else
6525 gcc_unreachable();
6526 }
6527
6528 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
6529 brace-enclosed aggregate initializer.
6530
6531 INIT is the CONSTRUCTOR containing the list of initializers describing
6532 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
6533 It may not presently match the shape of the TYPE; for example:
6534
6535 struct S { int a; int b; };
6536 struct S a[] = { 1, 2, 3, 4 };
6537
6538 Here INIT will hold a vector of four elements, rather than a
6539 vector of two elements, each itself a vector of two elements. This
6540 routine transforms INIT from the former form into the latter. The
6541 revised CONSTRUCTOR node is returned. */
6542
6543 tree
reshape_init(tree type,tree init,tsubst_flags_t complain)6544 reshape_init (tree type, tree init, tsubst_flags_t complain)
6545 {
6546 vec<constructor_elt, va_gc> *v;
6547 reshape_iter d;
6548 tree new_init;
6549
6550 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
6551
6552 v = CONSTRUCTOR_ELTS (init);
6553
6554 /* An empty constructor does not need reshaping, and it is always a valid
6555 initializer. */
6556 if (vec_safe_is_empty (v))
6557 return init;
6558
6559 /* Brace elision is not performed for a CONSTRUCTOR representing
6560 parenthesized aggregate initialization. */
6561 if (CONSTRUCTOR_IS_PAREN_INIT (init))
6562 return init;
6563
6564 /* Handle [dcl.init.list] direct-list-initialization from
6565 single element of enumeration with a fixed underlying type. */
6566 if (is_direct_enum_init (type, init))
6567 {
6568 tree elt = CONSTRUCTOR_ELT (init, 0)->value;
6569 type = cv_unqualified (type);
6570 if (check_narrowing (ENUM_UNDERLYING_TYPE (type), elt, complain))
6571 {
6572 warning_sentinel w (warn_useless_cast);
6573 warning_sentinel w2 (warn_ignored_qualifiers);
6574 return cp_build_c_cast (input_location, type, elt,
6575 tf_warning_or_error);
6576 }
6577 else
6578 return error_mark_node;
6579 }
6580
6581 /* Recurse on this CONSTRUCTOR. */
6582 d.cur = &(*v)[0];
6583 d.end = d.cur + v->length ();
6584
6585 new_init = reshape_init_r (type, &d, init, complain);
6586 if (new_init == error_mark_node)
6587 return error_mark_node;
6588
6589 /* Make sure all the element of the constructor were used. Otherwise,
6590 issue an error about exceeding initializers. */
6591 if (d.cur != d.end)
6592 {
6593 if (complain & tf_error)
6594 error ("too many initializers for %qT", type);
6595 return error_mark_node;
6596 }
6597
6598 if (CONSTRUCTOR_IS_DIRECT_INIT (init)
6599 && BRACE_ENCLOSED_INITIALIZER_P (new_init))
6600 CONSTRUCTOR_IS_DIRECT_INIT (new_init) = true;
6601 if (CONSTRUCTOR_IS_DESIGNATED_INIT (init)
6602 && BRACE_ENCLOSED_INITIALIZER_P (new_init))
6603 CONSTRUCTOR_IS_DESIGNATED_INIT (new_init) = true;
6604
6605 return new_init;
6606 }
6607
6608 /* Verify array initializer. Returns true if errors have been reported. */
6609
6610 bool
check_array_initializer(tree decl,tree type,tree init)6611 check_array_initializer (tree decl, tree type, tree init)
6612 {
6613 tree element_type = TREE_TYPE (type);
6614
6615 /* Structured binding when initialized with an array type needs
6616 to have complete type. */
6617 if (decl
6618 && DECL_DECOMPOSITION_P (decl)
6619 && !DECL_DECOMP_BASE (decl)
6620 && !COMPLETE_TYPE_P (type))
6621 {
6622 error_at (DECL_SOURCE_LOCATION (decl),
6623 "structured binding has incomplete type %qT", type);
6624 TREE_TYPE (decl) = error_mark_node;
6625 return true;
6626 }
6627
6628 /* The array type itself need not be complete, because the
6629 initializer may tell us how many elements are in the array.
6630 But, the elements of the array must be complete. */
6631 if (!COMPLETE_TYPE_P (complete_type (element_type)))
6632 {
6633 if (decl)
6634 error_at (DECL_SOURCE_LOCATION (decl),
6635 "elements of array %q#D have incomplete type", decl);
6636 else
6637 error ("elements of array %q#T have incomplete type", type);
6638 return true;
6639 }
6640
6641 location_t loc = (decl ? location_of (decl) : input_location);
6642 if (!verify_type_context (loc, TCTX_ARRAY_ELEMENT, element_type))
6643 return true;
6644
6645 /* A compound literal can't have variable size. */
6646 if (init && !decl
6647 && ((COMPLETE_TYPE_P (type) && !TREE_CONSTANT (TYPE_SIZE (type)))
6648 || !TREE_CONSTANT (TYPE_SIZE (element_type))))
6649 {
6650 error ("variable-sized compound literal");
6651 return true;
6652 }
6653 return false;
6654 }
6655
6656 /* Subroutine of check_initializer; args are passed down from that function.
6657 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
6658
6659 static tree
build_aggr_init_full_exprs(tree decl,tree init,int flags)6660 build_aggr_init_full_exprs (tree decl, tree init, int flags)
6661
6662 {
6663 gcc_assert (stmts_are_full_exprs_p ());
6664 return build_aggr_init (decl, init, flags, tf_warning_or_error);
6665 }
6666
6667 /* Verify INIT (the initializer for DECL), and record the
6668 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
6669 grok_reference_init.
6670
6671 If the return value is non-NULL, it is an expression that must be
6672 evaluated dynamically to initialize DECL. */
6673
6674 static tree
check_initializer(tree decl,tree init,int flags,vec<tree,va_gc> ** cleanups)6675 check_initializer (tree decl, tree init, int flags, vec<tree, va_gc> **cleanups)
6676 {
6677 tree type;
6678 tree init_code = NULL;
6679 tree core_type;
6680
6681 /* Things that are going to be initialized need to have complete
6682 type. */
6683 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
6684
6685 if (DECL_HAS_VALUE_EXPR_P (decl))
6686 {
6687 /* A variable with DECL_HAS_VALUE_EXPR_P set is just a placeholder,
6688 it doesn't have storage to be initialized. */
6689 gcc_assert (init == NULL_TREE);
6690 return NULL_TREE;
6691 }
6692
6693 if (type == error_mark_node)
6694 /* We will have already complained. */
6695 return NULL_TREE;
6696
6697 if (TREE_CODE (type) == ARRAY_TYPE)
6698 {
6699 if (check_array_initializer (decl, type, init))
6700 return NULL_TREE;
6701 }
6702 else if (!COMPLETE_TYPE_P (type))
6703 {
6704 error_at (DECL_SOURCE_LOCATION (decl),
6705 "%q#D has incomplete type", decl);
6706 TREE_TYPE (decl) = error_mark_node;
6707 return NULL_TREE;
6708 }
6709 else
6710 /* There is no way to make a variable-sized class type in GNU C++. */
6711 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
6712
6713 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
6714 {
6715 int init_len = CONSTRUCTOR_NELTS (init);
6716 if (SCALAR_TYPE_P (type))
6717 {
6718 if (init_len == 0)
6719 {
6720 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
6721 init = build_zero_init (type, NULL_TREE, false);
6722 }
6723 else if (init_len != 1 && TREE_CODE (type) != COMPLEX_TYPE)
6724 {
6725 error_at (cp_expr_loc_or_loc (init, DECL_SOURCE_LOCATION (decl)),
6726 "scalar object %qD requires one element in "
6727 "initializer", decl);
6728 TREE_TYPE (decl) = error_mark_node;
6729 return NULL_TREE;
6730 }
6731 }
6732 }
6733
6734 if (TREE_CODE (decl) == CONST_DECL)
6735 {
6736 gcc_assert (!TYPE_REF_P (type));
6737
6738 DECL_INITIAL (decl) = init;
6739
6740 gcc_assert (init != NULL_TREE);
6741 init = NULL_TREE;
6742 }
6743 else if (!init && DECL_REALLY_EXTERN (decl))
6744 ;
6745 else if (init || type_build_ctor_call (type)
6746 || TYPE_REF_P (type))
6747 {
6748 if (TYPE_REF_P (type))
6749 {
6750 init = grok_reference_init (decl, type, init, flags);
6751 flags |= LOOKUP_ALREADY_DIGESTED;
6752 }
6753 else if (!init)
6754 check_for_uninitialized_const_var (decl, /*constexpr_context_p=*/false,
6755 tf_warning_or_error);
6756 /* Do not reshape constructors of vectors (they don't need to be
6757 reshaped. */
6758 else if (BRACE_ENCLOSED_INITIALIZER_P (init))
6759 {
6760 if (is_std_init_list (type))
6761 {
6762 init = perform_implicit_conversion (type, init,
6763 tf_warning_or_error);
6764 flags |= LOOKUP_ALREADY_DIGESTED;
6765 }
6766 else if (TYPE_NON_AGGREGATE_CLASS (type))
6767 {
6768 /* Don't reshape if the class has constructors. */
6769 if (cxx_dialect == cxx98)
6770 error_at (cp_expr_loc_or_loc (init, DECL_SOURCE_LOCATION (decl)),
6771 "in C++98 %qD must be initialized by "
6772 "constructor, not by %<{...}%>",
6773 decl);
6774 }
6775 else if (VECTOR_TYPE_P (type) && TYPE_VECTOR_OPAQUE (type))
6776 {
6777 error ("opaque vector types cannot be initialized");
6778 init = error_mark_node;
6779 }
6780 else
6781 {
6782 init = reshape_init (type, init, tf_warning_or_error);
6783 flags |= LOOKUP_NO_NARROWING;
6784 }
6785 }
6786 /* [dcl.init] "Otherwise, if the destination type is an array, the object
6787 is initialized as follows..." So handle things like
6788
6789 int a[](1, 2, 3);
6790
6791 which is permitted in C++20 by P0960. */
6792 else if (TREE_CODE (init) == TREE_LIST
6793 && TREE_TYPE (init) == NULL_TREE
6794 && TREE_CODE (type) == ARRAY_TYPE
6795 && !DECL_DECOMPOSITION_P (decl)
6796 && (cxx_dialect >= cxx2a))
6797 {
6798 /* [dcl.init.string] "An array of ordinary character type [...]
6799 can be initialized by an ordinary string literal [...] by an
6800 appropriately-typed string literal enclosed in braces" only
6801 talks about braces, but GCC has always accepted
6802
6803 char a[]("foobar");
6804
6805 so we continue to do so. */
6806 tree val = TREE_VALUE (init);
6807 if (TREE_CHAIN (init) == NULL_TREE
6808 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type)))
6809 && TREE_CODE (tree_strip_any_location_wrapper (val))
6810 == STRING_CST)
6811 /* If the list has a single element and it's a string literal,
6812 then it's the initializer for the array as a whole. */
6813 init = val;
6814 else
6815 {
6816 init = build_constructor_from_list (init_list_type_node, init);
6817 CONSTRUCTOR_IS_DIRECT_INIT (init) = true;
6818 CONSTRUCTOR_IS_PAREN_INIT (init) = true;
6819 }
6820 }
6821 else if (TREE_CODE (init) == TREE_LIST
6822 && TREE_TYPE (init) != unknown_type_node
6823 && !MAYBE_CLASS_TYPE_P (type))
6824 {
6825 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
6826
6827 /* We get here with code like `int a (2);' */
6828 init = build_x_compound_expr_from_list (init, ELK_INIT,
6829 tf_warning_or_error);
6830 }
6831
6832 /* If DECL has an array type without a specific bound, deduce the
6833 array size from the initializer. */
6834 maybe_deduce_size_from_array_init (decl, init);
6835 type = TREE_TYPE (decl);
6836 if (type == error_mark_node)
6837 return NULL_TREE;
6838
6839 if (((type_build_ctor_call (type) || CLASS_TYPE_P (type))
6840 && !(flags & LOOKUP_ALREADY_DIGESTED)
6841 && !(init && BRACE_ENCLOSED_INITIALIZER_P (init)
6842 && CP_AGGREGATE_TYPE_P (type)
6843 && (CLASS_TYPE_P (type)
6844 || !TYPE_NEEDS_CONSTRUCTING (type)
6845 || type_has_extended_temps (type))))
6846 || (DECL_DECOMPOSITION_P (decl) && TREE_CODE (type) == ARRAY_TYPE))
6847 {
6848 init_code = build_aggr_init_full_exprs (decl, init, flags);
6849
6850 /* A constructor call is a non-trivial initializer even if
6851 it isn't explicitly written. */
6852 if (TREE_SIDE_EFFECTS (init_code))
6853 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = true;
6854
6855 /* If this is a constexpr initializer, expand_default_init will
6856 have returned an INIT_EXPR rather than a CALL_EXPR. In that
6857 case, pull the initializer back out and pass it down into
6858 store_init_value. */
6859 while (TREE_CODE (init_code) == EXPR_STMT
6860 || TREE_CODE (init_code) == CONVERT_EXPR)
6861 init_code = TREE_OPERAND (init_code, 0);
6862 if (TREE_CODE (init_code) == INIT_EXPR)
6863 {
6864 /* In C++20, the call to build_aggr_init could have created
6865 an INIT_EXPR with a CONSTRUCTOR as the RHS to handle
6866 A(1, 2). */
6867 init = TREE_OPERAND (init_code, 1);
6868 init_code = NULL_TREE;
6869 /* Don't call digest_init; it's unnecessary and will complain
6870 about aggregate initialization of non-aggregate classes. */
6871 flags |= LOOKUP_ALREADY_DIGESTED;
6872 }
6873 else if (DECL_DECLARED_CONSTEXPR_P (decl)
6874 || (flags & LOOKUP_CONSTINIT))
6875 {
6876 /* Declared constexpr or constinit, but no suitable initializer;
6877 massage init appropriately so we can pass it into
6878 store_init_value for the error. */
6879 tree new_init = NULL_TREE;
6880 if (!processing_template_decl
6881 && TREE_CODE (init_code) == CALL_EXPR)
6882 new_init = build_cplus_new (type, init_code, tf_none);
6883 else if (CLASS_TYPE_P (type)
6884 && (!init || TREE_CODE (init) == TREE_LIST))
6885 new_init = build_functional_cast (input_location, type,
6886 init, tf_none);
6887 if (new_init)
6888 {
6889 init = new_init;
6890 if (TREE_CODE (init) == TARGET_EXPR
6891 && !(flags & LOOKUP_ONLYCONVERTING))
6892 TARGET_EXPR_DIRECT_INIT_P (init) = true;
6893 }
6894 init_code = NULL_TREE;
6895 }
6896 else
6897 init = NULL_TREE;
6898 }
6899
6900 if (init && TREE_CODE (init) != TREE_VEC)
6901 {
6902 /* In aggregate initialization of a variable, each element
6903 initialization is a full-expression because there is no
6904 enclosing expression. */
6905 gcc_assert (stmts_are_full_exprs_p ());
6906
6907 init_code = store_init_value (decl, init, cleanups, flags);
6908
6909 if (DECL_INITIAL (decl)
6910 && TREE_CODE (DECL_INITIAL (decl)) == CONSTRUCTOR
6911 && !vec_safe_is_empty (CONSTRUCTOR_ELTS (DECL_INITIAL (decl))))
6912 {
6913 tree elt = CONSTRUCTOR_ELTS (DECL_INITIAL (decl))->last ().value;
6914 if (TREE_CODE (TREE_TYPE (elt)) == ARRAY_TYPE
6915 && TYPE_SIZE (TREE_TYPE (elt)) == NULL_TREE)
6916 cp_complete_array_type (&TREE_TYPE (elt), elt, false);
6917 }
6918
6919 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
6920 && DECL_INITIAL (decl)
6921 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
6922 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
6923 warning_at (cp_expr_loc_or_loc (DECL_INITIAL (decl),
6924 DECL_SOURCE_LOCATION (decl)),
6925 0, "array %qD initialized by parenthesized "
6926 "string literal %qE",
6927 decl, DECL_INITIAL (decl));
6928 init = NULL_TREE;
6929 }
6930 }
6931 else
6932 {
6933 if (CLASS_TYPE_P (core_type = strip_array_types (type))
6934 && (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type)
6935 || CLASSTYPE_REF_FIELDS_NEED_INIT (core_type)))
6936 diagnose_uninitialized_cst_or_ref_member (core_type, /*using_new=*/false,
6937 /*complain=*/true);
6938
6939 check_for_uninitialized_const_var (decl, /*constexpr_context_p=*/false,
6940 tf_warning_or_error);
6941 }
6942
6943 if (init && init != error_mark_node)
6944 init_code = build2 (INIT_EXPR, type, decl, init);
6945
6946 if (init_code && !TREE_SIDE_EFFECTS (init_code)
6947 && init_code != error_mark_node)
6948 init_code = NULL_TREE;
6949
6950 if (init_code)
6951 {
6952 /* We might have set these in cp_finish_decl. */
6953 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = false;
6954 TREE_CONSTANT (decl) = false;
6955 }
6956
6957 if (init_code
6958 && DECL_IN_AGGR_P (decl)
6959 && DECL_INITIALIZED_IN_CLASS_P (decl))
6960 {
6961 static int explained = 0;
6962
6963 if (cxx_dialect < cxx11)
6964 error ("initializer invalid for static member with constructor");
6965 else if (cxx_dialect < cxx17)
6966 error ("non-constant in-class initialization invalid for static "
6967 "member %qD", decl);
6968 else
6969 error ("non-constant in-class initialization invalid for non-inline "
6970 "static member %qD", decl);
6971 if (!explained)
6972 {
6973 inform (input_location,
6974 "(an out of class initialization is required)");
6975 explained = 1;
6976 }
6977 return NULL_TREE;
6978 }
6979
6980 return init_code;
6981 }
6982
6983 /* If DECL is not a local variable, give it RTL. */
6984
6985 static void
make_rtl_for_nonlocal_decl(tree decl,tree init,const char * asmspec)6986 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
6987 {
6988 int toplev = toplevel_bindings_p ();
6989 int defer_p;
6990
6991 /* Set the DECL_ASSEMBLER_NAME for the object. */
6992 if (asmspec)
6993 {
6994 /* The `register' keyword, when used together with an
6995 asm-specification, indicates that the variable should be
6996 placed in a particular register. */
6997 if (VAR_P (decl) && DECL_REGISTER (decl))
6998 {
6999 set_user_assembler_name (decl, asmspec);
7000 DECL_HARD_REGISTER (decl) = 1;
7001 }
7002 else
7003 {
7004 if (TREE_CODE (decl) == FUNCTION_DECL
7005 && fndecl_built_in_p (decl, BUILT_IN_NORMAL))
7006 set_builtin_user_assembler_name (decl, asmspec);
7007 set_user_assembler_name (decl, asmspec);
7008 }
7009 }
7010
7011 /* Handle non-variables up front. */
7012 if (!VAR_P (decl))
7013 {
7014 rest_of_decl_compilation (decl, toplev, at_eof);
7015 return;
7016 }
7017
7018 /* If we see a class member here, it should be a static data
7019 member. */
7020 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
7021 {
7022 gcc_assert (TREE_STATIC (decl));
7023 /* An in-class declaration of a static data member should be
7024 external; it is only a declaration, and not a definition. */
7025 if (init == NULL_TREE)
7026 gcc_assert (DECL_EXTERNAL (decl)
7027 || !TREE_PUBLIC (decl));
7028 }
7029
7030 /* We don't create any RTL for local variables. */
7031 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
7032 return;
7033
7034 /* We defer emission of local statics until the corresponding
7035 DECL_EXPR is expanded. But with constexpr its function might never
7036 be expanded, so go ahead and tell cgraph about the variable now. */
7037 defer_p = ((DECL_FUNCTION_SCOPE_P (decl)
7038 && !var_in_maybe_constexpr_fn (decl))
7039 || DECL_VIRTUAL_P (decl));
7040
7041 /* Defer template instantiations. */
7042 if (DECL_LANG_SPECIFIC (decl)
7043 && DECL_IMPLICIT_INSTANTIATION (decl))
7044 defer_p = 1;
7045
7046 /* If we're not deferring, go ahead and assemble the variable. */
7047 if (!defer_p)
7048 rest_of_decl_compilation (decl, toplev, at_eof);
7049 }
7050
7051 /* walk_tree helper for wrap_temporary_cleanups, below. */
7052
7053 static tree
wrap_cleanups_r(tree * stmt_p,int * walk_subtrees,void * data)7054 wrap_cleanups_r (tree *stmt_p, int *walk_subtrees, void *data)
7055 {
7056 /* Stop at types or full-expression boundaries. */
7057 if (TYPE_P (*stmt_p)
7058 || TREE_CODE (*stmt_p) == CLEANUP_POINT_EXPR)
7059 {
7060 *walk_subtrees = 0;
7061 return NULL_TREE;
7062 }
7063
7064 if (TREE_CODE (*stmt_p) == TARGET_EXPR)
7065 {
7066 tree guard = (tree)data;
7067 tree tcleanup = TARGET_EXPR_CLEANUP (*stmt_p);
7068
7069 tcleanup = build2 (TRY_CATCH_EXPR, void_type_node, tcleanup, guard);
7070 /* Tell honor_protect_cleanup_actions to handle this as a separate
7071 cleanup. */
7072 TRY_CATCH_IS_CLEANUP (tcleanup) = 1;
7073
7074 TARGET_EXPR_CLEANUP (*stmt_p) = tcleanup;
7075 }
7076
7077 return NULL_TREE;
7078 }
7079
7080 /* We're initializing a local variable which has a cleanup GUARD. If there
7081 are any temporaries used in the initializer INIT of this variable, we
7082 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
7083 variable will be cleaned up properly if one of them throws.
7084
7085 Unfortunately, there's no way to express this properly in terms of
7086 nesting, as the regions for the temporaries overlap the region for the
7087 variable itself; if there are two temporaries, the variable needs to be
7088 the first thing destroyed if either of them throws. However, we only
7089 want to run the variable's cleanup if it actually got constructed. So
7090 we need to guard the temporary cleanups with the variable's cleanup if
7091 they are run on the normal path, but not if they are run on the
7092 exceptional path. We implement this by telling
7093 honor_protect_cleanup_actions to strip the variable cleanup from the
7094 exceptional path. */
7095
7096 static void
wrap_temporary_cleanups(tree init,tree guard)7097 wrap_temporary_cleanups (tree init, tree guard)
7098 {
7099 cp_walk_tree_without_duplicates (&init, wrap_cleanups_r, (void *)guard);
7100 }
7101
7102 /* Generate code to initialize DECL (a local variable). */
7103
7104 static void
initialize_local_var(tree decl,tree init)7105 initialize_local_var (tree decl, tree init)
7106 {
7107 tree type = TREE_TYPE (decl);
7108 tree cleanup;
7109 int already_used;
7110
7111 gcc_assert (VAR_P (decl)
7112 || TREE_CODE (decl) == RESULT_DECL);
7113 gcc_assert (!TREE_STATIC (decl));
7114
7115 if (DECL_SIZE (decl) == NULL_TREE)
7116 {
7117 /* If we used it already as memory, it must stay in memory. */
7118 DECL_INITIAL (decl) = NULL_TREE;
7119 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
7120 return;
7121 }
7122
7123 if (type == error_mark_node)
7124 return;
7125
7126 /* Compute and store the initial value. */
7127 already_used = TREE_USED (decl) || TREE_USED (type);
7128 if (TREE_USED (type))
7129 DECL_READ_P (decl) = 1;
7130
7131 /* Generate a cleanup, if necessary. */
7132 cleanup = cxx_maybe_build_cleanup (decl, tf_warning_or_error);
7133
7134 /* Perform the initialization. */
7135 if (init)
7136 {
7137 tree rinit = (TREE_CODE (init) == INIT_EXPR
7138 ? TREE_OPERAND (init, 1) : NULL_TREE);
7139 if (rinit && !TREE_SIDE_EFFECTS (rinit))
7140 {
7141 /* Stick simple initializers in DECL_INITIAL so that
7142 -Wno-init-self works (c++/34772). */
7143 gcc_assert (TREE_OPERAND (init, 0) == decl);
7144 DECL_INITIAL (decl) = rinit;
7145
7146 if (warn_init_self && TYPE_REF_P (type))
7147 {
7148 STRIP_NOPS (rinit);
7149 if (rinit == decl)
7150 warning_at (DECL_SOURCE_LOCATION (decl),
7151 OPT_Winit_self,
7152 "reference %qD is initialized with itself", decl);
7153 }
7154 }
7155 else
7156 {
7157 int saved_stmts_are_full_exprs_p;
7158
7159 /* If we're only initializing a single object, guard the
7160 destructors of any temporaries used in its initializer with
7161 its destructor. This isn't right for arrays because each
7162 element initialization is a full-expression. */
7163 if (cleanup && TREE_CODE (type) != ARRAY_TYPE)
7164 wrap_temporary_cleanups (init, cleanup);
7165
7166 gcc_assert (building_stmt_list_p ());
7167 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
7168 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
7169 finish_expr_stmt (init);
7170 current_stmt_tree ()->stmts_are_full_exprs_p =
7171 saved_stmts_are_full_exprs_p;
7172 }
7173 }
7174
7175 /* Set this to 0 so we can tell whether an aggregate which was
7176 initialized was ever used. Don't do this if it has a
7177 destructor, so we don't complain about the 'resource
7178 allocation is initialization' idiom. Now set
7179 attribute((unused)) on types so decls of that type will be
7180 marked used. (see TREE_USED, above.) */
7181 if (TYPE_NEEDS_CONSTRUCTING (type)
7182 && ! already_used
7183 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
7184 && DECL_NAME (decl))
7185 TREE_USED (decl) = 0;
7186 else if (already_used)
7187 TREE_USED (decl) = 1;
7188
7189 if (cleanup)
7190 finish_decl_cleanup (decl, cleanup);
7191 }
7192
7193 /* DECL is a VAR_DECL for a compiler-generated variable with static
7194 storage duration (like a virtual table) whose initializer is a
7195 compile-time constant. Initialize the variable and provide it to the
7196 back end. */
7197
7198 void
initialize_artificial_var(tree decl,vec<constructor_elt,va_gc> * v)7199 initialize_artificial_var (tree decl, vec<constructor_elt, va_gc> *v)
7200 {
7201 tree init;
7202 gcc_assert (DECL_ARTIFICIAL (decl));
7203 init = build_constructor (TREE_TYPE (decl), v);
7204 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
7205 DECL_INITIAL (decl) = init;
7206 DECL_INITIALIZED_P (decl) = 1;
7207 /* Mark the decl as constexpr so that we can access its content
7208 at compile time. */
7209 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = true;
7210 DECL_DECLARED_CONSTEXPR_P (decl) = true;
7211 determine_visibility (decl);
7212 layout_var_decl (decl);
7213 maybe_commonize_var (decl);
7214 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
7215 }
7216
7217 /* INIT is the initializer for a variable, as represented by the
7218 parser. Returns true iff INIT is value-dependent. */
7219
7220 static bool
value_dependent_init_p(tree init)7221 value_dependent_init_p (tree init)
7222 {
7223 if (TREE_CODE (init) == TREE_LIST)
7224 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
7225 return any_value_dependent_elements_p (init);
7226 else if (TREE_CODE (init) == CONSTRUCTOR)
7227 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
7228 {
7229 if (dependent_type_p (TREE_TYPE (init)))
7230 return true;
7231
7232 vec<constructor_elt, va_gc> *elts;
7233 size_t nelts;
7234 size_t i;
7235
7236 elts = CONSTRUCTOR_ELTS (init);
7237 nelts = vec_safe_length (elts);
7238 for (i = 0; i < nelts; ++i)
7239 if (value_dependent_init_p ((*elts)[i].value))
7240 return true;
7241 }
7242 else
7243 /* It must be a simple expression, e.g., int i = 3; */
7244 return value_dependent_expression_p (init);
7245
7246 return false;
7247 }
7248
7249 // Returns true if a DECL is VAR_DECL with the concept specifier.
7250 static inline bool
is_concept_var(tree decl)7251 is_concept_var (tree decl)
7252 {
7253 return (VAR_P (decl)
7254 // Not all variables have DECL_LANG_SPECIFIC.
7255 && DECL_LANG_SPECIFIC (decl)
7256 && DECL_DECLARED_CONCEPT_P (decl));
7257 }
7258
7259 /* A helper function to be called via walk_tree. If any label exists
7260 under *TP, it is (going to be) forced. Set has_forced_label_in_static. */
7261
7262 static tree
notice_forced_label_r(tree * tp,int * walk_subtrees,void *)7263 notice_forced_label_r (tree *tp, int *walk_subtrees, void *)
7264 {
7265 if (TYPE_P (*tp))
7266 *walk_subtrees = 0;
7267 if (TREE_CODE (*tp) == LABEL_DECL)
7268 cfun->has_forced_label_in_static = 1;
7269 return NULL_TREE;
7270 }
7271
7272 /* Return true if DECL has either a trivial destructor, or for C++2A
7273 is constexpr and has a constexpr destructor. */
7274
7275 static bool
decl_maybe_constant_destruction(tree decl,tree type)7276 decl_maybe_constant_destruction (tree decl, tree type)
7277 {
7278 return (TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
7279 || (cxx_dialect >= cxx2a
7280 && VAR_P (decl)
7281 && DECL_DECLARED_CONSTEXPR_P (decl)
7282 && type_has_constexpr_destructor (strip_array_types (type))));
7283 }
7284
7285 static tree declare_simd_adjust_this (tree *, int *, void *);
7286
7287 /* Helper function of omp_declare_variant_finalize. Finalize one
7288 "omp declare variant base" attribute. Return true if it should be
7289 removed. */
7290
7291 static bool
omp_declare_variant_finalize_one(tree decl,tree attr)7292 omp_declare_variant_finalize_one (tree decl, tree attr)
7293 {
7294 if (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
7295 {
7296 walk_tree (&TREE_VALUE (TREE_VALUE (attr)), declare_simd_adjust_this,
7297 DECL_ARGUMENTS (decl), NULL);
7298 walk_tree (&TREE_PURPOSE (TREE_VALUE (attr)), declare_simd_adjust_this,
7299 DECL_ARGUMENTS (decl), NULL);
7300 }
7301
7302 tree ctx = TREE_VALUE (TREE_VALUE (attr));
7303 tree simd = omp_get_context_selector (ctx, "construct", "simd");
7304 if (simd)
7305 {
7306 TREE_VALUE (simd)
7307 = c_omp_declare_simd_clauses_to_numbers (DECL_ARGUMENTS (decl),
7308 TREE_VALUE (simd));
7309 /* FIXME, adjusting simd args unimplemented. */
7310 return true;
7311 }
7312
7313 tree chain = TREE_CHAIN (TREE_VALUE (attr));
7314 location_t varid_loc
7315 = cp_expr_loc_or_input_loc (TREE_PURPOSE (TREE_CHAIN (chain)));
7316 location_t match_loc = cp_expr_loc_or_input_loc (TREE_PURPOSE (chain));
7317 cp_id_kind idk = (cp_id_kind) tree_to_uhwi (TREE_VALUE (chain));
7318 tree variant = TREE_PURPOSE (TREE_VALUE (attr));
7319
7320 location_t save_loc = input_location;
7321 input_location = varid_loc;
7322
7323 releasing_vec args;
7324 tree parm = DECL_ARGUMENTS (decl);
7325 if (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
7326 parm = DECL_CHAIN (parm);
7327 for (; parm; parm = DECL_CHAIN (parm))
7328 if (type_dependent_expression_p (parm))
7329 vec_safe_push (args, build_constructor (TREE_TYPE (parm), NULL));
7330 else if (MAYBE_CLASS_TYPE_P (TREE_TYPE (parm)))
7331 vec_safe_push (args, build_local_temp (TREE_TYPE (parm)));
7332 else
7333 vec_safe_push (args, build_zero_cst (TREE_TYPE (parm)));
7334
7335 bool koenig_p = false;
7336 if (idk == CP_ID_KIND_UNQUALIFIED || idk == CP_ID_KIND_TEMPLATE_ID)
7337 {
7338 if (identifier_p (variant)
7339 /* In C++2A, we may need to perform ADL for a template
7340 name. */
7341 || (TREE_CODE (variant) == TEMPLATE_ID_EXPR
7342 && identifier_p (TREE_OPERAND (variant, 0))))
7343 {
7344 if (!args->is_empty ())
7345 {
7346 koenig_p = true;
7347 if (!any_type_dependent_arguments_p (args))
7348 variant = perform_koenig_lookup (variant, args,
7349 tf_warning_or_error);
7350 }
7351 else
7352 variant = unqualified_fn_lookup_error (variant);
7353 }
7354 else if (!args->is_empty () && is_overloaded_fn (variant))
7355 {
7356 tree fn = get_first_fn (variant);
7357 fn = STRIP_TEMPLATE (fn);
7358 if (!((TREE_CODE (fn) == USING_DECL && DECL_DEPENDENT_P (fn))
7359 || DECL_FUNCTION_MEMBER_P (fn)
7360 || DECL_LOCAL_FUNCTION_P (fn)))
7361 {
7362 koenig_p = true;
7363 if (!any_type_dependent_arguments_p (args))
7364 variant = perform_koenig_lookup (variant, args,
7365 tf_warning_or_error);
7366 }
7367 }
7368 }
7369
7370 if (idk == CP_ID_KIND_QUALIFIED)
7371 variant = finish_call_expr (variant, &args, /*disallow_virtual=*/true,
7372 koenig_p, tf_warning_or_error);
7373 else
7374 variant = finish_call_expr (variant, &args, /*disallow_virtual=*/false,
7375 koenig_p, tf_warning_or_error);
7376 if (variant == error_mark_node && !processing_template_decl)
7377 return true;
7378
7379 variant = cp_get_callee_fndecl_nofold (variant);
7380 input_location = save_loc;
7381
7382 if (variant)
7383 {
7384 const char *varname = IDENTIFIER_POINTER (DECL_NAME (variant));
7385 if (!comptypes (TREE_TYPE (decl), TREE_TYPE (variant), 0))
7386 {
7387 error_at (varid_loc, "variant %qD and base %qD have incompatible "
7388 "types", variant, decl);
7389 return true;
7390 }
7391 if (fndecl_built_in_p (variant)
7392 && (strncmp (varname, "__builtin_", strlen ("__builtin_")) == 0
7393 || strncmp (varname, "__sync_", strlen ("__sync_")) == 0
7394 || strncmp (varname, "__atomic_", strlen ("__atomic_")) == 0))
7395 {
7396 error_at (varid_loc, "variant %qD is a built-in", variant);
7397 return true;
7398 }
7399 else
7400 {
7401 tree construct = omp_get_context_selector (ctx, "construct", NULL);
7402 c_omp_mark_declare_variant (match_loc, variant, construct);
7403 if (!omp_context_selector_matches (ctx))
7404 return true;
7405 TREE_PURPOSE (TREE_VALUE (attr)) = variant;
7406 }
7407 }
7408 else if (!processing_template_decl)
7409 {
7410 error_at (varid_loc, "could not find variant declaration");
7411 return true;
7412 }
7413
7414 return false;
7415 }
7416
7417 /* Helper function, finish up "omp declare variant base" attribute
7418 now that there is a DECL. ATTR is the first "omp declare variant base"
7419 attribute. */
7420
7421 void
omp_declare_variant_finalize(tree decl,tree attr)7422 omp_declare_variant_finalize (tree decl, tree attr)
7423 {
7424 size_t attr_len = strlen ("omp declare variant base");
7425 tree *list = &DECL_ATTRIBUTES (decl);
7426 bool remove_all = false;
7427 location_t match_loc = DECL_SOURCE_LOCATION (decl);
7428 if (TREE_CHAIN (TREE_VALUE (attr))
7429 && TREE_PURPOSE (TREE_CHAIN (TREE_VALUE (attr)))
7430 && EXPR_HAS_LOCATION (TREE_PURPOSE (TREE_CHAIN (TREE_VALUE (attr)))))
7431 match_loc = EXPR_LOCATION (TREE_PURPOSE (TREE_CHAIN (TREE_VALUE (attr))));
7432 if (DECL_CONSTRUCTOR_P (decl))
7433 {
7434 error_at (match_loc, "%<declare variant%> on constructor %qD", decl);
7435 remove_all = true;
7436 }
7437 else if (DECL_DESTRUCTOR_P (decl))
7438 {
7439 error_at (match_loc, "%<declare variant%> on destructor %qD", decl);
7440 remove_all = true;
7441 }
7442 else if (DECL_DEFAULTED_FN (decl))
7443 {
7444 error_at (match_loc, "%<declare variant%> on defaulted %qD", decl);
7445 remove_all = true;
7446 }
7447 else if (DECL_DELETED_FN (decl))
7448 {
7449 error_at (match_loc, "%<declare variant%> on deleted %qD", decl);
7450 remove_all = true;
7451 }
7452 else if (DECL_VIRTUAL_P (decl))
7453 {
7454 error_at (match_loc, "%<declare variant%> on virtual %qD", decl);
7455 remove_all = true;
7456 }
7457 /* This loop is like private_lookup_attribute, except that it works
7458 with tree * rather than tree, as we might want to remove the
7459 attributes that are diagnosed as errorneous. */
7460 while (*list)
7461 {
7462 tree attr = get_attribute_name (*list);
7463 size_t ident_len = IDENTIFIER_LENGTH (attr);
7464 if (cmp_attribs ("omp declare variant base", attr_len,
7465 IDENTIFIER_POINTER (attr), ident_len))
7466 {
7467 if (remove_all || omp_declare_variant_finalize_one (decl, *list))
7468 {
7469 *list = TREE_CHAIN (*list);
7470 continue;
7471 }
7472 }
7473 list = &TREE_CHAIN (*list);
7474 }
7475 }
7476
7477 /* Finish processing of a declaration;
7478 install its line number and initial value.
7479 If the length of an array type is not known before,
7480 it must be determined now, from the initial value, or it is an error.
7481
7482 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
7483 true, then INIT is an integral constant expression.
7484
7485 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
7486 if the (init) syntax was used. */
7487
7488 void
cp_finish_decl(tree decl,tree init,bool init_const_expr_p,tree asmspec_tree,int flags)7489 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
7490 tree asmspec_tree, int flags)
7491 {
7492 tree type;
7493 vec<tree, va_gc> *cleanups = NULL;
7494 const char *asmspec = NULL;
7495 int was_readonly = 0;
7496 bool var_definition_p = false;
7497 tree auto_node;
7498
7499 if (decl == error_mark_node)
7500 return;
7501 else if (! decl)
7502 {
7503 if (init)
7504 error ("assignment (not initialization) in declaration");
7505 return;
7506 }
7507
7508 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
7509 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
7510 gcc_assert (TREE_CODE (decl) != PARM_DECL);
7511
7512 type = TREE_TYPE (decl);
7513 if (type == error_mark_node)
7514 return;
7515
7516 /* Warn about register storage specifiers except when in GNU global
7517 or local register variable extension. */
7518 if (VAR_P (decl) && DECL_REGISTER (decl) && asmspec_tree == NULL_TREE)
7519 {
7520 if (cxx_dialect >= cxx17)
7521 pedwarn (DECL_SOURCE_LOCATION (decl), OPT_Wregister,
7522 "ISO C++17 does not allow %<register%> storage "
7523 "class specifier");
7524 else
7525 warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wregister,
7526 "%<register%> storage class specifier used");
7527 }
7528
7529 /* If a name was specified, get the string. */
7530 if (at_namespace_scope_p ())
7531 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
7532 if (asmspec_tree && asmspec_tree != error_mark_node)
7533 asmspec = TREE_STRING_POINTER (asmspec_tree);
7534
7535 bool in_class_decl
7536 = (current_class_type
7537 && CP_DECL_CONTEXT (decl) == current_class_type
7538 && TYPE_BEING_DEFINED (current_class_type)
7539 && !CLASSTYPE_TEMPLATE_INSTANTIATION (current_class_type));
7540
7541 if (in_class_decl
7542 && (DECL_INITIAL (decl) || init))
7543 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
7544
7545 /* Do auto deduction unless decl is a function or an uninstantiated
7546 template specialization. */
7547 if (TREE_CODE (decl) != FUNCTION_DECL
7548 && !(init == NULL_TREE
7549 && DECL_LANG_SPECIFIC (decl)
7550 && DECL_TEMPLATE_INSTANTIATION (decl)
7551 && !DECL_TEMPLATE_INSTANTIATED (decl))
7552 && (auto_node = type_uses_auto (type)))
7553 {
7554 tree d_init;
7555 if (init == NULL_TREE)
7556 gcc_assert (CLASS_PLACEHOLDER_TEMPLATE (auto_node));
7557 d_init = init;
7558 if (d_init)
7559 {
7560 if (TREE_CODE (d_init) == TREE_LIST
7561 && !CLASS_PLACEHOLDER_TEMPLATE (auto_node))
7562 d_init = build_x_compound_expr_from_list (d_init, ELK_INIT,
7563 tf_warning_or_error);
7564 d_init = resolve_nondeduced_context (d_init, tf_warning_or_error);
7565 }
7566 enum auto_deduction_context adc = adc_variable_type;
7567 if (VAR_P (decl) && DECL_DECOMPOSITION_P (decl))
7568 adc = adc_decomp_type;
7569 type = TREE_TYPE (decl) = do_auto_deduction (type, d_init, auto_node,
7570 tf_warning_or_error, adc,
7571 NULL_TREE, flags);
7572 if (type == error_mark_node)
7573 return;
7574 if (TREE_CODE (type) == FUNCTION_TYPE)
7575 {
7576 error ("initializer for %<decltype(auto) %D%> has function type; "
7577 "did you forget the %<()%>?", decl);
7578 TREE_TYPE (decl) = error_mark_node;
7579 return;
7580 }
7581 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
7582 }
7583
7584 if (ensure_literal_type_for_constexpr_object (decl) == error_mark_node)
7585 {
7586 DECL_DECLARED_CONSTEXPR_P (decl) = 0;
7587 if (VAR_P (decl) && DECL_CLASS_SCOPE_P (decl))
7588 {
7589 init = NULL_TREE;
7590 DECL_EXTERNAL (decl) = 1;
7591 }
7592 }
7593
7594 if (VAR_P (decl)
7595 && DECL_CLASS_SCOPE_P (decl)
7596 && verify_type_context (DECL_SOURCE_LOCATION (decl),
7597 TCTX_STATIC_STORAGE, type)
7598 && DECL_INITIALIZED_IN_CLASS_P (decl))
7599 check_static_variable_definition (decl, type);
7600
7601 if (init && TREE_CODE (decl) == FUNCTION_DECL)
7602 {
7603 tree clone;
7604 if (init == ridpointers[(int)RID_DELETE])
7605 {
7606 /* FIXME check this is 1st decl. */
7607 DECL_DELETED_FN (decl) = 1;
7608 DECL_DECLARED_INLINE_P (decl) = 1;
7609 DECL_INITIAL (decl) = error_mark_node;
7610 FOR_EACH_CLONE (clone, decl)
7611 {
7612 DECL_DELETED_FN (clone) = 1;
7613 DECL_DECLARED_INLINE_P (clone) = 1;
7614 DECL_INITIAL (clone) = error_mark_node;
7615 }
7616 init = NULL_TREE;
7617 }
7618 else if (init == ridpointers[(int)RID_DEFAULT])
7619 {
7620 if (defaultable_fn_check (decl))
7621 DECL_DEFAULTED_FN (decl) = 1;
7622 else
7623 DECL_INITIAL (decl) = NULL_TREE;
7624 }
7625 }
7626
7627 if (init && VAR_P (decl))
7628 {
7629 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
7630 /* If DECL is a reference, then we want to know whether init is a
7631 reference constant; init_const_expr_p as passed tells us whether
7632 it's an rvalue constant. */
7633 if (TYPE_REF_P (type))
7634 init_const_expr_p = potential_constant_expression (init);
7635 if (init_const_expr_p)
7636 {
7637 /* Set these flags now for templates. We'll update the flags in
7638 store_init_value for instantiations. */
7639 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
7640 if (decl_maybe_constant_var_p (decl)
7641 /* FIXME setting TREE_CONSTANT on refs breaks the back end. */
7642 && !TYPE_REF_P (type))
7643 TREE_CONSTANT (decl) = 1;
7644 }
7645 }
7646
7647 if (flag_openmp
7648 && TREE_CODE (decl) == FUNCTION_DECL
7649 /* #pragma omp declare variant on methods handled in finish_struct
7650 instead. */
7651 && (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
7652 || COMPLETE_TYPE_P (DECL_CONTEXT (decl))))
7653 if (tree attr = lookup_attribute ("omp declare variant base",
7654 DECL_ATTRIBUTES (decl)))
7655 omp_declare_variant_finalize (decl, attr);
7656
7657 if (processing_template_decl)
7658 {
7659 bool type_dependent_p;
7660
7661 /* Add this declaration to the statement-tree. */
7662 if (at_function_scope_p ())
7663 add_decl_expr (decl);
7664
7665 type_dependent_p = dependent_type_p (type);
7666
7667 if (check_for_bare_parameter_packs (init))
7668 {
7669 init = NULL_TREE;
7670 DECL_INITIAL (decl) = NULL_TREE;
7671 }
7672
7673 /* Handle `constinit' on variable templates. */
7674 if (flags & LOOKUP_CONSTINIT)
7675 TINFO_VAR_DECLARED_CONSTINIT (DECL_TEMPLATE_INFO (decl)) = true;
7676
7677 /* Generally, initializers in templates are expanded when the
7678 template is instantiated. But, if DECL is a variable constant
7679 then it can be used in future constant expressions, so its value
7680 must be available. */
7681
7682 bool dep_init = false;
7683
7684 if (!VAR_P (decl) || type_dependent_p)
7685 /* We can't do anything if the decl has dependent type. */;
7686 else if (!init && is_concept_var (decl))
7687 {
7688 error ("variable concept has no initializer");
7689 init = boolean_true_node;
7690 }
7691 else if (init
7692 && init_const_expr_p
7693 && !TYPE_REF_P (type)
7694 && decl_maybe_constant_var_p (decl)
7695 && !(dep_init = value_dependent_init_p (init)))
7696 {
7697 /* This variable seems to be a non-dependent constant, so process
7698 its initializer. If check_initializer returns non-null the
7699 initialization wasn't constant after all. */
7700 tree init_code;
7701 cleanups = make_tree_vector ();
7702 init_code = check_initializer (decl, init, flags, &cleanups);
7703 if (init_code == NULL_TREE)
7704 init = NULL_TREE;
7705 release_tree_vector (cleanups);
7706 }
7707 else
7708 {
7709 gcc_assert (!DECL_PRETTY_FUNCTION_P (decl));
7710 /* Deduce array size even if the initializer is dependent. */
7711 maybe_deduce_size_from_array_init (decl, init);
7712 /* And complain about multiple initializers. */
7713 if (init && TREE_CODE (init) == TREE_LIST && TREE_CHAIN (init)
7714 && !MAYBE_CLASS_TYPE_P (type))
7715 init = build_x_compound_expr_from_list (init, ELK_INIT,
7716 tf_warning_or_error);
7717 }
7718
7719 if (init)
7720 DECL_INITIAL (decl) = init;
7721
7722 if (dep_init)
7723 {
7724 retrofit_lang_decl (decl);
7725 SET_DECL_DEPENDENT_INIT_P (decl, true);
7726 }
7727
7728 if (VAR_P (decl) && DECL_REGISTER (decl) && asmspec)
7729 {
7730 set_user_assembler_name (decl, asmspec);
7731 DECL_HARD_REGISTER (decl) = 1;
7732 }
7733 return;
7734 }
7735
7736 /* Just store non-static data member initializers for later. */
7737 if (init && TREE_CODE (decl) == FIELD_DECL)
7738 DECL_INITIAL (decl) = init;
7739
7740 /* Take care of TYPE_DECLs up front. */
7741 if (TREE_CODE (decl) == TYPE_DECL)
7742 {
7743 if (type != error_mark_node
7744 && MAYBE_CLASS_TYPE_P (type) && DECL_NAME (decl))
7745 {
7746 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
7747 warning (0, "shadowing previous type declaration of %q#D", decl);
7748 set_identifier_type_value (DECL_NAME (decl), decl);
7749 }
7750
7751 /* If we have installed this as the canonical typedef for this
7752 type, and that type has not been defined yet, delay emitting
7753 the debug information for it, as we will emit it later. */
7754 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
7755 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
7756 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
7757
7758 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl),
7759 at_eof);
7760 return;
7761 }
7762
7763 /* A reference will be modified here, as it is initialized. */
7764 if (! DECL_EXTERNAL (decl)
7765 && TREE_READONLY (decl)
7766 && TYPE_REF_P (type))
7767 {
7768 was_readonly = 1;
7769 TREE_READONLY (decl) = 0;
7770 }
7771
7772 /* This needs to happen before extend_ref_init_temps. */
7773 if (VAR_OR_FUNCTION_DECL_P (decl))
7774 {
7775 if (VAR_P (decl))
7776 maybe_commonize_var (decl);
7777 determine_visibility (decl);
7778 }
7779
7780 if (VAR_P (decl))
7781 {
7782 duration_kind dk = decl_storage_duration (decl);
7783 /* [dcl.constinit]/1 "The constinit specifier shall be applied
7784 only to a declaration of a variable with static or thread storage
7785 duration." */
7786 if ((flags & LOOKUP_CONSTINIT)
7787 && !(dk == dk_thread || dk == dk_static))
7788 {
7789 error_at (DECL_SOURCE_LOCATION (decl),
7790 "%<constinit%> can only be applied to a variable with "
7791 "static or thread storage duration");
7792 return;
7793 }
7794
7795 /* If this is a local variable that will need a mangled name,
7796 register it now. We must do this before processing the
7797 initializer for the variable, since the initialization might
7798 require a guard variable, and since the mangled name of the
7799 guard variable will depend on the mangled name of this
7800 variable. */
7801 if (DECL_FUNCTION_SCOPE_P (decl)
7802 && TREE_STATIC (decl)
7803 && !DECL_ARTIFICIAL (decl))
7804 {
7805 /* The variable holding an anonymous union will have had its
7806 discriminator set in finish_anon_union, after which it's
7807 NAME will have been cleared. */
7808 if (DECL_NAME (decl))
7809 determine_local_discriminator (decl);
7810 /* Normally has_forced_label_in_static is set during GIMPLE
7811 lowering, but [cd]tors are never actually compiled directly.
7812 We need to set this early so we can deal with the label
7813 address extension. */
7814 if ((DECL_CONSTRUCTOR_P (current_function_decl)
7815 || DECL_DESTRUCTOR_P (current_function_decl))
7816 && init)
7817 {
7818 walk_tree (&init, notice_forced_label_r, NULL, NULL);
7819 add_local_decl (cfun, decl);
7820 }
7821 /* And make sure it's in the symbol table for
7822 c_parse_final_cleanups to find. */
7823 varpool_node::get_create (decl);
7824 }
7825
7826 /* Convert the initializer to the type of DECL, if we have not
7827 already initialized DECL. */
7828 if (!DECL_INITIALIZED_P (decl)
7829 /* If !DECL_EXTERNAL then DECL is being defined. In the
7830 case of a static data member initialized inside the
7831 class-specifier, there can be an initializer even if DECL
7832 is *not* defined. */
7833 && (!DECL_EXTERNAL (decl) || init))
7834 {
7835 cleanups = make_tree_vector ();
7836 init = check_initializer (decl, init, flags, &cleanups);
7837
7838 /* Handle:
7839
7840 [dcl.init]
7841
7842 The memory occupied by any object of static storage
7843 duration is zero-initialized at program startup before
7844 any other initialization takes place.
7845
7846 We cannot create an appropriate initializer until after
7847 the type of DECL is finalized. If DECL_INITIAL is set,
7848 then the DECL is statically initialized, and any
7849 necessary zero-initialization has already been performed. */
7850 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
7851 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
7852 /*nelts=*/NULL_TREE,
7853 /*static_storage_p=*/true);
7854 /* Remember that the initialization for this variable has
7855 taken place. */
7856 DECL_INITIALIZED_P (decl) = 1;
7857 /* This declaration is the definition of this variable,
7858 unless we are initializing a static data member within
7859 the class specifier. */
7860 if (!DECL_EXTERNAL (decl))
7861 var_definition_p = true;
7862 }
7863 /* If the variable has an array type, lay out the type, even if
7864 there is no initializer. It is valid to index through the
7865 array, and we must get TYPE_ALIGN set correctly on the array
7866 type. */
7867 else if (TREE_CODE (type) == ARRAY_TYPE)
7868 layout_type (type);
7869
7870 if (TREE_STATIC (decl)
7871 && !at_function_scope_p ()
7872 && current_function_decl == NULL)
7873 /* So decl is a global variable or a static member of a
7874 non local class. Record the types it uses
7875 so that we can decide later to emit debug info for them. */
7876 record_types_used_by_current_var_decl (decl);
7877 }
7878
7879 /* Add this declaration to the statement-tree. This needs to happen
7880 after the call to check_initializer so that the DECL_EXPR for a
7881 reference temp is added before the DECL_EXPR for the reference itself. */
7882 if (DECL_FUNCTION_SCOPE_P (decl))
7883 {
7884 /* If we're building a variable sized type, and we might be
7885 reachable other than via the top of the current binding
7886 level, then create a new BIND_EXPR so that we deallocate
7887 the object at the right time. */
7888 if (VAR_P (decl)
7889 && DECL_SIZE (decl)
7890 && !TREE_CONSTANT (DECL_SIZE (decl))
7891 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list))
7892 {
7893 tree bind;
7894 bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL);
7895 TREE_SIDE_EFFECTS (bind) = 1;
7896 add_stmt (bind);
7897 BIND_EXPR_BODY (bind) = push_stmt_list ();
7898 }
7899 add_decl_expr (decl);
7900 }
7901
7902 /* Let the middle end know about variables and functions -- but not
7903 static data members in uninstantiated class templates. */
7904 if (VAR_OR_FUNCTION_DECL_P (decl))
7905 {
7906 if (VAR_P (decl))
7907 {
7908 layout_var_decl (decl);
7909 if (!flag_weak)
7910 /* Check again now that we have an initializer. */
7911 maybe_commonize_var (decl);
7912 /* A class-scope constexpr variable with an out-of-class declaration.
7913 C++17 makes them implicitly inline, but still force it out. */
7914 if (DECL_INLINE_VAR_P (decl)
7915 && !DECL_VAR_DECLARED_INLINE_P (decl)
7916 && !DECL_TEMPLATE_INSTANTIATION (decl)
7917 && !in_class_decl)
7918 mark_needed (decl);
7919 }
7920
7921 if (var_definition_p
7922 /* With -fmerge-all-constants, gimplify_init_constructor
7923 might add TREE_STATIC to aggregate variables. */
7924 && (TREE_STATIC (decl)
7925 || (flag_merge_constants >= 2
7926 && AGGREGATE_TYPE_P (type))))
7927 {
7928 /* If a TREE_READONLY variable needs initialization
7929 at runtime, it is no longer readonly and we need to
7930 avoid MEM_READONLY_P being set on RTL created for it. */
7931 if (init)
7932 {
7933 if (TREE_READONLY (decl))
7934 TREE_READONLY (decl) = 0;
7935 was_readonly = 0;
7936 }
7937 else if (was_readonly)
7938 TREE_READONLY (decl) = 1;
7939
7940 /* Likewise if it needs destruction. */
7941 if (!decl_maybe_constant_destruction (decl, type))
7942 TREE_READONLY (decl) = 0;
7943 }
7944 else if (VAR_P (decl)
7945 && CP_DECL_THREAD_LOCAL_P (decl)
7946 && (!DECL_EXTERNAL (decl) || flag_extern_tls_init)
7947 && (was_readonly || TREE_READONLY (decl))
7948 && var_needs_tls_wrapper (decl))
7949 {
7950 /* TLS variables need dynamic initialization by the TLS wrapper
7951 function, we don't want to hoist accesses to it before the
7952 wrapper. */
7953 was_readonly = 0;
7954 TREE_READONLY (decl) = 0;
7955 }
7956
7957 make_rtl_for_nonlocal_decl (decl, init, asmspec);
7958
7959 /* Check for abstractness of the type. Notice that there is no
7960 need to strip array types here since the check for those types
7961 is already done within create_array_type_for_decl. */
7962 abstract_virtuals_error (decl, type);
7963
7964 if (TREE_TYPE (decl) == error_mark_node)
7965 /* No initialization required. */
7966 ;
7967 else if (TREE_CODE (decl) == FUNCTION_DECL)
7968 {
7969 if (init)
7970 {
7971 if (init == ridpointers[(int)RID_DEFAULT])
7972 {
7973 /* An out-of-class default definition is defined at
7974 the point where it is explicitly defaulted. */
7975 if (DECL_DELETED_FN (decl))
7976 maybe_explain_implicit_delete (decl);
7977 else if (DECL_INITIAL (decl) == error_mark_node)
7978 synthesize_method (decl);
7979 }
7980 else
7981 error_at (cp_expr_loc_or_loc (init,
7982 DECL_SOURCE_LOCATION (decl)),
7983 "function %q#D is initialized like a variable",
7984 decl);
7985 }
7986 /* else no initialization required. */
7987 }
7988 else if (DECL_EXTERNAL (decl)
7989 && ! (DECL_LANG_SPECIFIC (decl)
7990 && DECL_NOT_REALLY_EXTERN (decl)))
7991 {
7992 /* check_initializer will have done any constant initialization. */
7993 }
7994 /* A variable definition. */
7995 else if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
7996 /* Initialize the local variable. */
7997 initialize_local_var (decl, init);
7998
7999 /* If a variable is defined, and then a subsequent
8000 definition with external linkage is encountered, we will
8001 get here twice for the same variable. We want to avoid
8002 calling expand_static_init more than once. For variables
8003 that are not static data members, we can call
8004 expand_static_init only when we actually process the
8005 initializer. It is not legal to redeclare a static data
8006 member, so this issue does not arise in that case. */
8007 else if (var_definition_p && TREE_STATIC (decl))
8008 expand_static_init (decl, init);
8009 }
8010
8011 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
8012 reference, insert it in the statement-tree now. */
8013 if (cleanups)
8014 {
8015 unsigned i; tree t;
8016 FOR_EACH_VEC_ELT (*cleanups, i, t)
8017 push_cleanup (NULL_TREE, t, false);
8018 release_tree_vector (cleanups);
8019 }
8020
8021 if (was_readonly)
8022 TREE_READONLY (decl) = 1;
8023
8024 if (flag_openmp
8025 && VAR_P (decl)
8026 && lookup_attribute ("omp declare target implicit",
8027 DECL_ATTRIBUTES (decl)))
8028 {
8029 DECL_ATTRIBUTES (decl)
8030 = remove_attribute ("omp declare target implicit",
8031 DECL_ATTRIBUTES (decl));
8032 complete_type (TREE_TYPE (decl));
8033 if (!cp_omp_mappable_type (TREE_TYPE (decl)))
8034 {
8035 error ("%q+D in declare target directive does not have mappable"
8036 " type", decl);
8037 cp_omp_emit_unmappable_type_notes (TREE_TYPE (decl));
8038 }
8039 else if (!lookup_attribute ("omp declare target",
8040 DECL_ATTRIBUTES (decl))
8041 && !lookup_attribute ("omp declare target link",
8042 DECL_ATTRIBUTES (decl)))
8043 DECL_ATTRIBUTES (decl)
8044 = tree_cons (get_identifier ("omp declare target"),
8045 NULL_TREE, DECL_ATTRIBUTES (decl));
8046 }
8047
8048 invoke_plugin_callbacks (PLUGIN_FINISH_DECL, decl);
8049 }
8050
8051 /* For class TYPE return itself or some its bases that contain
8052 any direct non-static data members. Return error_mark_node if an
8053 error has been diagnosed. */
8054
8055 static tree
find_decomp_class_base(location_t loc,tree type,tree ret)8056 find_decomp_class_base (location_t loc, tree type, tree ret)
8057 {
8058 bool member_seen = false;
8059 for (tree field = TYPE_FIELDS (type); field; field = DECL_CHAIN (field))
8060 if (TREE_CODE (field) != FIELD_DECL
8061 || DECL_ARTIFICIAL (field)
8062 || DECL_UNNAMED_BIT_FIELD (field))
8063 continue;
8064 else if (ret)
8065 return type;
8066 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field)))
8067 {
8068 if (TREE_CODE (TREE_TYPE (field)) == RECORD_TYPE)
8069 error_at (loc, "cannot decompose class type %qT because it has an "
8070 "anonymous struct member", type);
8071 else
8072 error_at (loc, "cannot decompose class type %qT because it has an "
8073 "anonymous union member", type);
8074 inform (DECL_SOURCE_LOCATION (field), "declared here");
8075 return error_mark_node;
8076 }
8077 else if (!accessible_p (type, field, true))
8078 {
8079 error_at (loc, "cannot decompose inaccessible member %qD of %qT",
8080 field, type);
8081 inform (DECL_SOURCE_LOCATION (field),
8082 TREE_PRIVATE (field)
8083 ? G_("declared private here")
8084 : G_("declared protected here"));
8085 return error_mark_node;
8086 }
8087 else
8088 member_seen = true;
8089
8090 tree base_binfo, binfo;
8091 tree orig_ret = ret;
8092 int i;
8093 if (member_seen)
8094 ret = type;
8095 for (binfo = TYPE_BINFO (type), i = 0;
8096 BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
8097 {
8098 tree t = find_decomp_class_base (loc, TREE_TYPE (base_binfo), ret);
8099 if (t == error_mark_node)
8100 return error_mark_node;
8101 if (t != NULL_TREE && t != ret)
8102 {
8103 if (ret == type)
8104 {
8105 error_at (loc, "cannot decompose class type %qT: both it and "
8106 "its base class %qT have non-static data members",
8107 type, t);
8108 return error_mark_node;
8109 }
8110 else if (orig_ret != NULL_TREE)
8111 return t;
8112 else if (ret != NULL_TREE)
8113 {
8114 error_at (loc, "cannot decompose class type %qT: its base "
8115 "classes %qT and %qT have non-static data "
8116 "members", type, ret, t);
8117 return error_mark_node;
8118 }
8119 else
8120 ret = t;
8121 }
8122 }
8123 return ret;
8124 }
8125
8126 /* Return std::tuple_size<TYPE>::value. */
8127
8128 static tree
get_tuple_size(tree type)8129 get_tuple_size (tree type)
8130 {
8131 tree args = make_tree_vec (1);
8132 TREE_VEC_ELT (args, 0) = type;
8133 tree inst = lookup_template_class (tuple_size_identifier, args,
8134 /*in_decl*/NULL_TREE,
8135 /*context*/std_node,
8136 /*entering_scope*/false, tf_none);
8137 inst = complete_type (inst);
8138 if (inst == error_mark_node || !COMPLETE_TYPE_P (inst))
8139 return NULL_TREE;
8140 tree val = lookup_qualified_name (inst, value_identifier,
8141 /*type*/false, /*complain*/false);
8142 if (TREE_CODE (val) == VAR_DECL || TREE_CODE (val) == CONST_DECL)
8143 val = maybe_constant_value (val);
8144 if (TREE_CODE (val) == INTEGER_CST)
8145 return val;
8146 else
8147 return error_mark_node;
8148 }
8149
8150 /* Return std::tuple_element<I,TYPE>::type. */
8151
8152 static tree
get_tuple_element_type(tree type,unsigned i)8153 get_tuple_element_type (tree type, unsigned i)
8154 {
8155 tree args = make_tree_vec (2);
8156 TREE_VEC_ELT (args, 0) = build_int_cst (integer_type_node, i);
8157 TREE_VEC_ELT (args, 1) = type;
8158 tree inst = lookup_template_class (tuple_element_identifier, args,
8159 /*in_decl*/NULL_TREE,
8160 /*context*/std_node,
8161 /*entering_scope*/false,
8162 tf_warning_or_error);
8163 return make_typename_type (inst, type_identifier,
8164 none_type, tf_warning_or_error);
8165 }
8166
8167 /* Return e.get<i>() or get<i>(e). */
8168
8169 static tree
get_tuple_decomp_init(tree decl,unsigned i)8170 get_tuple_decomp_init (tree decl, unsigned i)
8171 {
8172 tree targs = make_tree_vec (1);
8173 TREE_VEC_ELT (targs, 0) = build_int_cst (integer_type_node, i);
8174
8175 tree etype = TREE_TYPE (decl);
8176 tree e = convert_from_reference (decl);
8177
8178 /* [The id-expression] e is an lvalue if the type of the entity e is an
8179 lvalue reference and an xvalue otherwise. */
8180 if (!TYPE_REF_P (etype)
8181 || TYPE_REF_IS_RVALUE (etype))
8182 e = move (e);
8183
8184 tree fns = lookup_qualified_name (TREE_TYPE (e), get__identifier,
8185 /*type*/false, /*complain*/false);
8186 bool use_member_get = false;
8187
8188 /* To use a member get, member lookup must find at least one
8189 declaration that is a function template
8190 whose first template parameter is a non-type parameter. */
8191 for (lkp_iterator iter (MAYBE_BASELINK_FUNCTIONS (fns)); iter; ++iter)
8192 {
8193 tree fn = *iter;
8194 if (TREE_CODE (fn) == TEMPLATE_DECL)
8195 {
8196 tree tparms = DECL_TEMPLATE_PARMS (fn);
8197 tree parm = TREE_VEC_ELT (INNERMOST_TEMPLATE_PARMS (tparms), 0);
8198 if (TREE_CODE (TREE_VALUE (parm)) == PARM_DECL)
8199 {
8200 use_member_get = true;
8201 break;
8202 }
8203 }
8204 }
8205
8206 if (use_member_get)
8207 {
8208 fns = lookup_template_function (fns, targs);
8209 return build_new_method_call (e, fns, /*args*/NULL,
8210 /*path*/NULL_TREE, LOOKUP_NORMAL,
8211 /*fn_p*/NULL, tf_warning_or_error);
8212 }
8213 else
8214 {
8215 releasing_vec args (make_tree_vector_single (e));
8216 fns = lookup_template_function (get__identifier, targs);
8217 fns = perform_koenig_lookup (fns, args, tf_warning_or_error);
8218 return finish_call_expr (fns, &args, /*novirt*/false,
8219 /*koenig*/true, tf_warning_or_error);
8220 }
8221 }
8222
8223 /* It's impossible to recover the decltype of a tuple decomposition variable
8224 based on the actual type of the variable, so store it in a hash table. */
8225
8226 static GTY((cache)) decl_tree_cache_map *decomp_type_table;
8227
8228 tree
lookup_decomp_type(tree v)8229 lookup_decomp_type (tree v)
8230 {
8231 return *decomp_type_table->get (v);
8232 }
8233
8234 /* Mangle a decomposition declaration if needed. Arguments like
8235 in cp_finish_decomp. */
8236
8237 void
cp_maybe_mangle_decomp(tree decl,tree first,unsigned int count)8238 cp_maybe_mangle_decomp (tree decl, tree first, unsigned int count)
8239 {
8240 if (!processing_template_decl
8241 && !error_operand_p (decl)
8242 && TREE_STATIC (decl))
8243 {
8244 auto_vec<tree, 16> v;
8245 v.safe_grow (count);
8246 tree d = first;
8247 for (unsigned int i = 0; i < count; i++, d = DECL_CHAIN (d))
8248 v[count - i - 1] = d;
8249 SET_DECL_ASSEMBLER_NAME (decl, mangle_decomp (decl, v));
8250 maybe_apply_pragma_weak (decl);
8251 }
8252 }
8253
8254 /* Finish a decomposition declaration. DECL is the underlying declaration
8255 "e", FIRST is the head of a chain of decls for the individual identifiers
8256 chained through DECL_CHAIN in reverse order and COUNT is the number of
8257 those decls. */
8258
8259 void
cp_finish_decomp(tree decl,tree first,unsigned int count)8260 cp_finish_decomp (tree decl, tree first, unsigned int count)
8261 {
8262 if (error_operand_p (decl))
8263 {
8264 error_out:
8265 while (count--)
8266 {
8267 TREE_TYPE (first) = error_mark_node;
8268 if (DECL_HAS_VALUE_EXPR_P (first))
8269 {
8270 SET_DECL_VALUE_EXPR (first, NULL_TREE);
8271 DECL_HAS_VALUE_EXPR_P (first) = 0;
8272 }
8273 first = DECL_CHAIN (first);
8274 }
8275 if (DECL_P (decl) && DECL_NAMESPACE_SCOPE_P (decl))
8276 SET_DECL_ASSEMBLER_NAME (decl, get_identifier ("<decomp>"));
8277 return;
8278 }
8279
8280 location_t loc = DECL_SOURCE_LOCATION (decl);
8281 if (type_dependent_expression_p (decl)
8282 /* This happens for range for when not in templates.
8283 Still add the DECL_VALUE_EXPRs for later processing. */
8284 || (!processing_template_decl
8285 && type_uses_auto (TREE_TYPE (decl))))
8286 {
8287 for (unsigned int i = 0; i < count; i++)
8288 {
8289 if (!DECL_HAS_VALUE_EXPR_P (first))
8290 {
8291 tree v = build_nt (ARRAY_REF, decl,
8292 size_int (count - i - 1),
8293 NULL_TREE, NULL_TREE);
8294 SET_DECL_VALUE_EXPR (first, v);
8295 DECL_HAS_VALUE_EXPR_P (first) = 1;
8296 }
8297 if (processing_template_decl)
8298 fit_decomposition_lang_decl (first, decl);
8299 first = DECL_CHAIN (first);
8300 }
8301 return;
8302 }
8303
8304 auto_vec<tree, 16> v;
8305 v.safe_grow (count);
8306 tree d = first;
8307 for (unsigned int i = 0; i < count; i++, d = DECL_CHAIN (d))
8308 {
8309 v[count - i - 1] = d;
8310 fit_decomposition_lang_decl (d, decl);
8311 }
8312
8313 tree type = TREE_TYPE (decl);
8314 tree dexp = decl;
8315
8316 if (TYPE_REF_P (type))
8317 {
8318 dexp = convert_from_reference (dexp);
8319 type = complete_type (TREE_TYPE (type));
8320 if (type == error_mark_node)
8321 goto error_out;
8322 if (!COMPLETE_TYPE_P (type))
8323 {
8324 error_at (loc, "structured binding refers to incomplete type %qT",
8325 type);
8326 goto error_out;
8327 }
8328 }
8329
8330 tree eltype = NULL_TREE;
8331 unsigned HOST_WIDE_INT eltscnt = 0;
8332 if (TREE_CODE (type) == ARRAY_TYPE)
8333 {
8334 tree nelts;
8335 nelts = array_type_nelts_top (type);
8336 if (nelts == error_mark_node)
8337 goto error_out;
8338 if (!tree_fits_uhwi_p (nelts))
8339 {
8340 error_at (loc, "cannot decompose variable length array %qT", type);
8341 goto error_out;
8342 }
8343 eltscnt = tree_to_uhwi (nelts);
8344 if (count != eltscnt)
8345 {
8346 cnt_mismatch:
8347 if (count > eltscnt)
8348 error_n (loc, count,
8349 "%u name provided for structured binding",
8350 "%u names provided for structured binding", count);
8351 else
8352 error_n (loc, count,
8353 "only %u name provided for structured binding",
8354 "only %u names provided for structured binding", count);
8355 inform_n (loc, eltscnt,
8356 "while %qT decomposes into %wu element",
8357 "while %qT decomposes into %wu elements",
8358 type, eltscnt);
8359 goto error_out;
8360 }
8361 eltype = TREE_TYPE (type);
8362 for (unsigned int i = 0; i < count; i++)
8363 {
8364 TREE_TYPE (v[i]) = eltype;
8365 layout_decl (v[i], 0);
8366 if (processing_template_decl)
8367 continue;
8368 tree t = unshare_expr (dexp);
8369 t = build4_loc (DECL_SOURCE_LOCATION (v[i]), ARRAY_REF,
8370 eltype, t, size_int (i), NULL_TREE,
8371 NULL_TREE);
8372 SET_DECL_VALUE_EXPR (v[i], t);
8373 DECL_HAS_VALUE_EXPR_P (v[i]) = 1;
8374 }
8375 }
8376 /* 2 GNU extensions. */
8377 else if (TREE_CODE (type) == COMPLEX_TYPE)
8378 {
8379 eltscnt = 2;
8380 if (count != eltscnt)
8381 goto cnt_mismatch;
8382 eltype = cp_build_qualified_type (TREE_TYPE (type), TYPE_QUALS (type));
8383 for (unsigned int i = 0; i < count; i++)
8384 {
8385 TREE_TYPE (v[i]) = eltype;
8386 layout_decl (v[i], 0);
8387 if (processing_template_decl)
8388 continue;
8389 tree t = unshare_expr (dexp);
8390 t = build1_loc (DECL_SOURCE_LOCATION (v[i]),
8391 i ? IMAGPART_EXPR : REALPART_EXPR, eltype,
8392 t);
8393 SET_DECL_VALUE_EXPR (v[i], t);
8394 DECL_HAS_VALUE_EXPR_P (v[i]) = 1;
8395 }
8396 }
8397 else if (TREE_CODE (type) == VECTOR_TYPE)
8398 {
8399 if (!TYPE_VECTOR_SUBPARTS (type).is_constant (&eltscnt))
8400 {
8401 error_at (loc, "cannot decompose variable length vector %qT", type);
8402 goto error_out;
8403 }
8404 if (count != eltscnt)
8405 goto cnt_mismatch;
8406 eltype = cp_build_qualified_type (TREE_TYPE (type), TYPE_QUALS (type));
8407 for (unsigned int i = 0; i < count; i++)
8408 {
8409 TREE_TYPE (v[i]) = eltype;
8410 layout_decl (v[i], 0);
8411 if (processing_template_decl)
8412 continue;
8413 tree t = unshare_expr (dexp);
8414 convert_vector_to_array_for_subscript (DECL_SOURCE_LOCATION (v[i]),
8415 &t, size_int (i));
8416 t = build4_loc (DECL_SOURCE_LOCATION (v[i]), ARRAY_REF,
8417 eltype, t, size_int (i), NULL_TREE,
8418 NULL_TREE);
8419 SET_DECL_VALUE_EXPR (v[i], t);
8420 DECL_HAS_VALUE_EXPR_P (v[i]) = 1;
8421 }
8422 }
8423 else if (tree tsize = get_tuple_size (type))
8424 {
8425 if (tsize == error_mark_node)
8426 {
8427 error_at (loc, "%<std::tuple_size<%T>::value%> is not an integral "
8428 "constant expression", type);
8429 goto error_out;
8430 }
8431 if (!tree_fits_uhwi_p (tsize))
8432 {
8433 error_n (loc, count,
8434 "%u name provided for structured binding",
8435 "%u names provided for structured binding", count);
8436 inform (loc, "while %qT decomposes into %E elements",
8437 type, tsize);
8438 goto error_out;
8439 }
8440 eltscnt = tree_to_uhwi (tsize);
8441 if (count != eltscnt)
8442 goto cnt_mismatch;
8443 int save_read = DECL_READ_P (decl);
8444 for (unsigned i = 0; i < count; ++i)
8445 {
8446 location_t sloc = input_location;
8447 location_t dloc = DECL_SOURCE_LOCATION (v[i]);
8448
8449 input_location = dloc;
8450 tree init = get_tuple_decomp_init (decl, i);
8451 tree eltype = (init == error_mark_node ? error_mark_node
8452 : get_tuple_element_type (type, i));
8453 input_location = sloc;
8454
8455 if (VOID_TYPE_P (eltype))
8456 {
8457 error ("%<std::tuple_element<%u, %T>::type%> is %<void%>",
8458 i, type);
8459 eltype = error_mark_node;
8460 }
8461 if (init == error_mark_node || eltype == error_mark_node)
8462 {
8463 inform (dloc, "in initialization of structured binding "
8464 "variable %qD", v[i]);
8465 goto error_out;
8466 }
8467 /* Save the decltype away before reference collapse. */
8468 hash_map_safe_put<hm_ggc> (decomp_type_table, v[i], eltype);
8469 eltype = cp_build_reference_type (eltype, !lvalue_p (init));
8470 TREE_TYPE (v[i]) = eltype;
8471 layout_decl (v[i], 0);
8472 if (DECL_HAS_VALUE_EXPR_P (v[i]))
8473 {
8474 /* In this case the names are variables, not just proxies. */
8475 SET_DECL_VALUE_EXPR (v[i], NULL_TREE);
8476 DECL_HAS_VALUE_EXPR_P (v[i]) = 0;
8477 }
8478 if (!processing_template_decl)
8479 {
8480 copy_linkage (v[i], decl);
8481 cp_finish_decl (v[i], init, /*constexpr*/false,
8482 /*asm*/NULL_TREE, LOOKUP_NORMAL);
8483 }
8484 }
8485 /* Ignore reads from the underlying decl performed during initialization
8486 of the individual variables. If those will be read, we'll mark
8487 the underlying decl as read at that point. */
8488 DECL_READ_P (decl) = save_read;
8489 }
8490 else if (TREE_CODE (type) == UNION_TYPE)
8491 {
8492 error_at (loc, "cannot decompose union type %qT", type);
8493 goto error_out;
8494 }
8495 else if (!CLASS_TYPE_P (type))
8496 {
8497 error_at (loc, "cannot decompose non-array non-class type %qT", type);
8498 goto error_out;
8499 }
8500 else if (LAMBDA_TYPE_P (type))
8501 {
8502 error_at (loc, "cannot decompose lambda closure type %qT", type);
8503 goto error_out;
8504 }
8505 else if (processing_template_decl && complete_type (type) == error_mark_node)
8506 goto error_out;
8507 else if (processing_template_decl && !COMPLETE_TYPE_P (type))
8508 pedwarn (loc, 0, "structured binding refers to incomplete class type %qT",
8509 type);
8510 else
8511 {
8512 tree btype = find_decomp_class_base (loc, type, NULL_TREE);
8513 if (btype == error_mark_node)
8514 goto error_out;
8515 else if (btype == NULL_TREE)
8516 {
8517 error_at (loc, "cannot decompose class type %qT without non-static "
8518 "data members", type);
8519 goto error_out;
8520 }
8521 for (tree field = TYPE_FIELDS (btype); field; field = TREE_CHAIN (field))
8522 if (TREE_CODE (field) != FIELD_DECL
8523 || DECL_ARTIFICIAL (field)
8524 || DECL_UNNAMED_BIT_FIELD (field))
8525 continue;
8526 else
8527 eltscnt++;
8528 if (count != eltscnt)
8529 goto cnt_mismatch;
8530 tree t = dexp;
8531 if (type != btype)
8532 {
8533 t = convert_to_base (t, btype, /*check_access*/true,
8534 /*nonnull*/false, tf_warning_or_error);
8535 type = btype;
8536 }
8537 unsigned int i = 0;
8538 for (tree field = TYPE_FIELDS (btype); field; field = TREE_CHAIN (field))
8539 if (TREE_CODE (field) != FIELD_DECL
8540 || DECL_ARTIFICIAL (field)
8541 || DECL_UNNAMED_BIT_FIELD (field))
8542 continue;
8543 else
8544 {
8545 tree tt = finish_non_static_data_member (field, unshare_expr (t),
8546 NULL_TREE);
8547 if (REFERENCE_REF_P (tt))
8548 tt = TREE_OPERAND (tt, 0);
8549 TREE_TYPE (v[i]) = TREE_TYPE (tt);
8550 layout_decl (v[i], 0);
8551 if (!processing_template_decl)
8552 {
8553 SET_DECL_VALUE_EXPR (v[i], tt);
8554 DECL_HAS_VALUE_EXPR_P (v[i]) = 1;
8555 }
8556 i++;
8557 }
8558 }
8559 if (processing_template_decl)
8560 {
8561 for (unsigned int i = 0; i < count; i++)
8562 if (!DECL_HAS_VALUE_EXPR_P (v[i]))
8563 {
8564 tree a = build_nt (ARRAY_REF, decl, size_int (i),
8565 NULL_TREE, NULL_TREE);
8566 SET_DECL_VALUE_EXPR (v[i], a);
8567 DECL_HAS_VALUE_EXPR_P (v[i]) = 1;
8568 }
8569 }
8570 }
8571
8572 /* Returns a declaration for a VAR_DECL as if:
8573
8574 extern "C" TYPE NAME;
8575
8576 had been seen. Used to create compiler-generated global
8577 variables. */
8578
8579 static tree
declare_global_var(tree name,tree type)8580 declare_global_var (tree name, tree type)
8581 {
8582 tree decl;
8583
8584 push_to_top_level ();
8585 decl = build_decl (input_location, VAR_DECL, name, type);
8586 TREE_PUBLIC (decl) = 1;
8587 DECL_EXTERNAL (decl) = 1;
8588 DECL_ARTIFICIAL (decl) = 1;
8589 DECL_CONTEXT (decl) = FROB_CONTEXT (global_namespace);
8590 /* If the user has explicitly declared this variable (perhaps
8591 because the code we are compiling is part of a low-level runtime
8592 library), then it is possible that our declaration will be merged
8593 with theirs by pushdecl. */
8594 decl = pushdecl (decl);
8595 cp_finish_decl (decl, NULL_TREE, false, NULL_TREE, 0);
8596 pop_from_top_level ();
8597
8598 return decl;
8599 }
8600
8601 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
8602 if "__cxa_atexit" is not being used) corresponding to the function
8603 to be called when the program exits. */
8604
8605 static tree
get_atexit_fn_ptr_type(void)8606 get_atexit_fn_ptr_type (void)
8607 {
8608 tree fn_type;
8609
8610 if (!atexit_fn_ptr_type_node)
8611 {
8612 tree arg_type;
8613 if (flag_use_cxa_atexit
8614 && !targetm.cxx.use_atexit_for_cxa_atexit ())
8615 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
8616 arg_type = ptr_type_node;
8617 else
8618 /* The parameter to "atexit" is "void (*)(void)". */
8619 arg_type = NULL_TREE;
8620
8621 fn_type = build_function_type_list (void_type_node,
8622 arg_type, NULL_TREE);
8623 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
8624 }
8625
8626 return atexit_fn_ptr_type_node;
8627 }
8628
8629 /* Returns a pointer to the `atexit' function. Note that if
8630 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
8631 `__cxa_atexit' function specified in the IA64 C++ ABI. */
8632
8633 static tree
get_atexit_node(void)8634 get_atexit_node (void)
8635 {
8636 tree atexit_fndecl;
8637 tree fn_type;
8638 tree fn_ptr_type;
8639 const char *name;
8640 bool use_aeabi_atexit;
8641
8642 if (atexit_node)
8643 return atexit_node;
8644
8645 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
8646 {
8647 /* The declaration for `__cxa_atexit' is:
8648
8649 int __cxa_atexit (void (*)(void *), void *, void *)
8650
8651 We build up the argument types and then the function type
8652 itself. */
8653 tree argtype0, argtype1, argtype2;
8654
8655 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
8656 /* First, build the pointer-to-function type for the first
8657 argument. */
8658 fn_ptr_type = get_atexit_fn_ptr_type ();
8659 /* Then, build the rest of the argument types. */
8660 argtype2 = ptr_type_node;
8661 if (use_aeabi_atexit)
8662 {
8663 argtype1 = fn_ptr_type;
8664 argtype0 = ptr_type_node;
8665 }
8666 else
8667 {
8668 argtype1 = ptr_type_node;
8669 argtype0 = fn_ptr_type;
8670 }
8671 /* And the final __cxa_atexit type. */
8672 fn_type = build_function_type_list (integer_type_node,
8673 argtype0, argtype1, argtype2,
8674 NULL_TREE);
8675 if (use_aeabi_atexit)
8676 name = "__aeabi_atexit";
8677 else
8678 name = "__cxa_atexit";
8679 }
8680 else
8681 {
8682 /* The declaration for `atexit' is:
8683
8684 int atexit (void (*)());
8685
8686 We build up the argument types and then the function type
8687 itself. */
8688 fn_ptr_type = get_atexit_fn_ptr_type ();
8689 /* Build the final atexit type. */
8690 fn_type = build_function_type_list (integer_type_node,
8691 fn_ptr_type, NULL_TREE);
8692 name = "atexit";
8693 }
8694
8695 /* Now, build the function declaration. */
8696 push_lang_context (lang_name_c);
8697 atexit_fndecl = build_library_fn_ptr (name, fn_type, ECF_LEAF | ECF_NOTHROW);
8698 mark_used (atexit_fndecl);
8699 pop_lang_context ();
8700 atexit_node = decay_conversion (atexit_fndecl, tf_warning_or_error);
8701
8702 return atexit_node;
8703 }
8704
8705 /* Like get_atexit_node, but for thread-local cleanups. */
8706
8707 static tree
get_thread_atexit_node(void)8708 get_thread_atexit_node (void)
8709 {
8710 /* The declaration for `__cxa_thread_atexit' is:
8711
8712 int __cxa_thread_atexit (void (*)(void *), void *, void *) */
8713 tree fn_type = build_function_type_list (integer_type_node,
8714 get_atexit_fn_ptr_type (),
8715 ptr_type_node, ptr_type_node,
8716 NULL_TREE);
8717
8718 /* Now, build the function declaration. */
8719 tree atexit_fndecl = build_library_fn_ptr ("__cxa_thread_atexit", fn_type,
8720 ECF_LEAF | ECF_NOTHROW);
8721 return decay_conversion (atexit_fndecl, tf_warning_or_error);
8722 }
8723
8724 /* Returns the __dso_handle VAR_DECL. */
8725
8726 static tree
get_dso_handle_node(void)8727 get_dso_handle_node (void)
8728 {
8729 if (dso_handle_node)
8730 return dso_handle_node;
8731
8732 /* Declare the variable. */
8733 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
8734 ptr_type_node);
8735
8736 #ifdef HAVE_GAS_HIDDEN
8737 if (dso_handle_node != error_mark_node)
8738 {
8739 DECL_VISIBILITY (dso_handle_node) = VISIBILITY_HIDDEN;
8740 DECL_VISIBILITY_SPECIFIED (dso_handle_node) = 1;
8741 }
8742 #endif
8743
8744 return dso_handle_node;
8745 }
8746
8747 /* Begin a new function with internal linkage whose job will be simply
8748 to destroy some particular variable. */
8749
8750 static GTY(()) int start_cleanup_cnt;
8751
8752 static tree
start_cleanup_fn(void)8753 start_cleanup_fn (void)
8754 {
8755 char name[32];
8756 tree fntype;
8757 tree fndecl;
8758 bool use_cxa_atexit = flag_use_cxa_atexit
8759 && !targetm.cxx.use_atexit_for_cxa_atexit ();
8760
8761 push_to_top_level ();
8762
8763 /* No need to mangle this. */
8764 push_lang_context (lang_name_c);
8765
8766 /* Build the name of the function. */
8767 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
8768 /* Build the function declaration. */
8769 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
8770 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
8771 /* It's a function with internal linkage, generated by the
8772 compiler. */
8773 TREE_PUBLIC (fndecl) = 0;
8774 DECL_ARTIFICIAL (fndecl) = 1;
8775 /* Make the function `inline' so that it is only emitted if it is
8776 actually needed. It is unlikely that it will be inlined, since
8777 it is only called via a function pointer, but we avoid unnecessary
8778 emissions this way. */
8779 DECL_DECLARED_INLINE_P (fndecl) = 1;
8780 DECL_INTERFACE_KNOWN (fndecl) = 1;
8781 /* Build the parameter. */
8782 if (use_cxa_atexit)
8783 {
8784 tree parmdecl = cp_build_parm_decl (fndecl, NULL_TREE, ptr_type_node);
8785 TREE_USED (parmdecl) = 1;
8786 DECL_READ_P (parmdecl) = 1;
8787 DECL_ARGUMENTS (fndecl) = parmdecl;
8788 }
8789
8790 pushdecl (fndecl);
8791 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
8792
8793 pop_lang_context ();
8794
8795 return current_function_decl;
8796 }
8797
8798 /* Finish the cleanup function begun by start_cleanup_fn. */
8799
8800 static void
end_cleanup_fn(void)8801 end_cleanup_fn (void)
8802 {
8803 expand_or_defer_fn (finish_function (/*inline_p=*/false));
8804
8805 pop_from_top_level ();
8806 }
8807
8808 /* Generate code to handle the destruction of DECL, an object with
8809 static storage duration. */
8810
8811 tree
register_dtor_fn(tree decl)8812 register_dtor_fn (tree decl)
8813 {
8814 tree cleanup;
8815 tree addr;
8816 tree compound_stmt;
8817 tree fcall;
8818 tree type;
8819 bool ob_parm, dso_parm, use_dtor;
8820 tree arg0, arg1, arg2;
8821 tree atex_node;
8822
8823 type = TREE_TYPE (decl);
8824 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
8825 return void_node;
8826
8827 if (decl_maybe_constant_destruction (decl, type)
8828 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl))
8829 {
8830 cxx_maybe_build_cleanup (decl, tf_warning_or_error);
8831 return void_node;
8832 }
8833
8834 /* If we're using "__cxa_atexit" (or "__cxa_thread_atexit" or
8835 "__aeabi_atexit"), and DECL is a class object, we can just pass the
8836 destructor to "__cxa_atexit"; we don't have to build a temporary
8837 function to do the cleanup. */
8838 dso_parm = (flag_use_cxa_atexit
8839 && !targetm.cxx.use_atexit_for_cxa_atexit ());
8840 ob_parm = (CP_DECL_THREAD_LOCAL_P (decl) || dso_parm);
8841 use_dtor = ob_parm && CLASS_TYPE_P (type);
8842 if (use_dtor)
8843 {
8844 cleanup = get_class_binding (type, complete_dtor_identifier);
8845
8846 /* Make sure it is accessible. */
8847 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup,
8848 tf_warning_or_error);
8849 }
8850 else
8851 {
8852 /* Call build_cleanup before we enter the anonymous function so
8853 that any access checks will be done relative to the current
8854 scope, rather than the scope of the anonymous function. */
8855 build_cleanup (decl);
8856
8857 /* Now start the function. */
8858 cleanup = start_cleanup_fn ();
8859
8860 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
8861 to the original function, rather than the anonymous one. That
8862 will make the back end think that nested functions are in use,
8863 which causes confusion. */
8864 push_deferring_access_checks (dk_no_check);
8865 fcall = build_cleanup (decl);
8866 pop_deferring_access_checks ();
8867
8868 /* Create the body of the anonymous function. */
8869 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
8870 finish_expr_stmt (fcall);
8871 finish_compound_stmt (compound_stmt);
8872 end_cleanup_fn ();
8873 }
8874
8875 /* Call atexit with the cleanup function. */
8876 mark_used (cleanup);
8877 cleanup = build_address (cleanup);
8878
8879 if (CP_DECL_THREAD_LOCAL_P (decl))
8880 atex_node = get_thread_atexit_node ();
8881 else
8882 atex_node = get_atexit_node ();
8883
8884 if (use_dtor)
8885 {
8886 /* We must convert CLEANUP to the type that "__cxa_atexit"
8887 expects. */
8888 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
8889 /* "__cxa_atexit" will pass the address of DECL to the
8890 cleanup function. */
8891 mark_used (decl);
8892 addr = build_address (decl);
8893 /* The declared type of the parameter to "__cxa_atexit" is
8894 "void *". For plain "T*", we could just let the
8895 machinery in cp_build_function_call convert it -- but if the
8896 type is "cv-qualified T *", then we need to convert it
8897 before passing it in, to avoid spurious errors. */
8898 addr = build_nop (ptr_type_node, addr);
8899 }
8900 else
8901 /* Since the cleanup functions we build ignore the address
8902 they're given, there's no reason to pass the actual address
8903 in, and, in general, it's cheaper to pass NULL than any
8904 other value. */
8905 addr = null_pointer_node;
8906
8907 if (dso_parm)
8908 arg2 = cp_build_addr_expr (get_dso_handle_node (),
8909 tf_warning_or_error);
8910 else if (ob_parm)
8911 /* Just pass NULL to the dso handle parm if we don't actually
8912 have a DSO handle on this target. */
8913 arg2 = null_pointer_node;
8914 else
8915 arg2 = NULL_TREE;
8916
8917 if (ob_parm)
8918 {
8919 if (!CP_DECL_THREAD_LOCAL_P (decl)
8920 && targetm.cxx.use_aeabi_atexit ())
8921 {
8922 arg1 = cleanup;
8923 arg0 = addr;
8924 }
8925 else
8926 {
8927 arg1 = addr;
8928 arg0 = cleanup;
8929 }
8930 }
8931 else
8932 {
8933 arg0 = cleanup;
8934 arg1 = NULL_TREE;
8935 }
8936 return cp_build_function_call_nary (atex_node, tf_warning_or_error,
8937 arg0, arg1, arg2, NULL_TREE);
8938 }
8939
8940 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
8941 is its initializer. Generate code to handle the construction
8942 and destruction of DECL. */
8943
8944 static void
expand_static_init(tree decl,tree init)8945 expand_static_init (tree decl, tree init)
8946 {
8947 gcc_assert (VAR_P (decl));
8948 gcc_assert (TREE_STATIC (decl));
8949
8950 /* Some variables require no dynamic initialization. */
8951 if (decl_maybe_constant_destruction (decl, TREE_TYPE (decl)))
8952 {
8953 /* Make sure the destructor is callable. */
8954 cxx_maybe_build_cleanup (decl, tf_warning_or_error);
8955 if (!init)
8956 return;
8957 }
8958
8959 if (CP_DECL_THREAD_LOCAL_P (decl) && DECL_GNU_TLS_P (decl)
8960 && !DECL_FUNCTION_SCOPE_P (decl))
8961 {
8962 location_t dloc = DECL_SOURCE_LOCATION (decl);
8963 if (init)
8964 error_at (dloc, "non-local variable %qD declared %<__thread%> "
8965 "needs dynamic initialization", decl);
8966 else
8967 error_at (dloc, "non-local variable %qD declared %<__thread%> "
8968 "has a non-trivial destructor", decl);
8969 static bool informed;
8970 if (!informed)
8971 {
8972 inform (dloc, "C++11 %<thread_local%> allows dynamic "
8973 "initialization and destruction");
8974 informed = true;
8975 }
8976 return;
8977 }
8978
8979 if (DECL_FUNCTION_SCOPE_P (decl))
8980 {
8981 /* Emit code to perform this initialization but once. */
8982 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
8983 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
8984 tree guard, guard_addr;
8985 tree flag, begin;
8986 /* We don't need thread-safety code for thread-local vars. */
8987 bool thread_guard = (flag_threadsafe_statics
8988 && !CP_DECL_THREAD_LOCAL_P (decl));
8989
8990 /* Emit code to perform this initialization but once. This code
8991 looks like:
8992
8993 static <type> guard;
8994 if (!__atomic_load (guard.first_byte)) {
8995 if (__cxa_guard_acquire (&guard)) {
8996 bool flag = false;
8997 try {
8998 // Do initialization.
8999 flag = true; __cxa_guard_release (&guard);
9000 // Register variable for destruction at end of program.
9001 } catch {
9002 if (!flag) __cxa_guard_abort (&guard);
9003 }
9004 }
9005 }
9006
9007 Note that the `flag' variable is only set to 1 *after* the
9008 initialization is complete. This ensures that an exception,
9009 thrown during the construction, will cause the variable to
9010 reinitialized when we pass through this code again, as per:
9011
9012 [stmt.dcl]
9013
9014 If the initialization exits by throwing an exception, the
9015 initialization is not complete, so it will be tried again
9016 the next time control enters the declaration.
9017
9018 This process should be thread-safe, too; multiple threads
9019 should not be able to initialize the variable more than
9020 once. */
9021
9022 /* Create the guard variable. */
9023 guard = get_guard (decl);
9024
9025 /* Begin the conditional initialization. */
9026 if_stmt = begin_if_stmt ();
9027
9028 finish_if_stmt_cond (get_guard_cond (guard, thread_guard), if_stmt);
9029 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
9030
9031 if (thread_guard)
9032 {
9033 tree vfntype = NULL_TREE;
9034 tree acquire_name, release_name, abort_name;
9035 tree acquire_fn, release_fn, abort_fn;
9036 guard_addr = build_address (guard);
9037
9038 acquire_name = get_identifier ("__cxa_guard_acquire");
9039 release_name = get_identifier ("__cxa_guard_release");
9040 abort_name = get_identifier ("__cxa_guard_abort");
9041 acquire_fn = get_global_binding (acquire_name);
9042 release_fn = get_global_binding (release_name);
9043 abort_fn = get_global_binding (abort_name);
9044 if (!acquire_fn)
9045 acquire_fn = push_library_fn
9046 (acquire_name, build_function_type_list (integer_type_node,
9047 TREE_TYPE (guard_addr),
9048 NULL_TREE),
9049 NULL_TREE, ECF_NOTHROW);
9050 if (!release_fn || !abort_fn)
9051 vfntype = build_function_type_list (void_type_node,
9052 TREE_TYPE (guard_addr),
9053 NULL_TREE);
9054 if (!release_fn)
9055 release_fn = push_library_fn (release_name, vfntype, NULL_TREE,
9056 ECF_NOTHROW);
9057 if (!abort_fn)
9058 abort_fn = push_library_fn (abort_name, vfntype, NULL_TREE,
9059 ECF_NOTHROW | ECF_LEAF);
9060
9061 inner_if_stmt = begin_if_stmt ();
9062 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
9063 inner_if_stmt);
9064
9065 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
9066 begin = get_target_expr (boolean_false_node);
9067 flag = TARGET_EXPR_SLOT (begin);
9068
9069 TARGET_EXPR_CLEANUP (begin)
9070 = build3 (COND_EXPR, void_type_node, flag,
9071 void_node,
9072 build_call_n (abort_fn, 1, guard_addr));
9073 CLEANUP_EH_ONLY (begin) = 1;
9074
9075 /* Do the initialization itself. */
9076 init = add_stmt_to_compound (begin, init);
9077 init = add_stmt_to_compound (init,
9078 build2 (MODIFY_EXPR, void_type_node,
9079 flag, boolean_true_node));
9080
9081 /* Use atexit to register a function for destroying this static
9082 variable. Do this before calling __cxa_guard_release. */
9083 init = add_stmt_to_compound (init, register_dtor_fn (decl));
9084
9085 init = add_stmt_to_compound (init, build_call_n (release_fn, 1,
9086 guard_addr));
9087 }
9088 else
9089 {
9090 init = add_stmt_to_compound (init, set_guard (guard));
9091
9092 /* Use atexit to register a function for destroying this static
9093 variable. */
9094 init = add_stmt_to_compound (init, register_dtor_fn (decl));
9095 }
9096
9097 finish_expr_stmt (init);
9098
9099 if (thread_guard)
9100 {
9101 finish_compound_stmt (inner_then_clause);
9102 finish_then_clause (inner_if_stmt);
9103 finish_if_stmt (inner_if_stmt);
9104 }
9105
9106 finish_compound_stmt (then_clause);
9107 finish_then_clause (if_stmt);
9108 finish_if_stmt (if_stmt);
9109 }
9110 else if (CP_DECL_THREAD_LOCAL_P (decl))
9111 tls_aggregates = tree_cons (init, decl, tls_aggregates);
9112 else
9113 static_aggregates = tree_cons (init, decl, static_aggregates);
9114 }
9115
9116
9117 /* Make TYPE a complete type based on INITIAL_VALUE.
9118 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
9119 2 if there was no information (in which case assume 0 if DO_DEFAULT),
9120 3 if the initializer list is empty (in pedantic mode). */
9121
9122 int
cp_complete_array_type(tree * ptype,tree initial_value,bool do_default)9123 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
9124 {
9125 int failure;
9126 tree type, elt_type;
9127
9128 /* Don't get confused by a CONSTRUCTOR for some other type. */
9129 if (initial_value && TREE_CODE (initial_value) == CONSTRUCTOR
9130 && !BRACE_ENCLOSED_INITIALIZER_P (initial_value)
9131 && TREE_CODE (TREE_TYPE (initial_value)) != ARRAY_TYPE)
9132 return 1;
9133
9134 if (initial_value)
9135 {
9136 unsigned HOST_WIDE_INT i;
9137 tree value;
9138
9139 /* An array of character type can be initialized from a
9140 brace-enclosed string constant.
9141
9142 FIXME: this code is duplicated from reshape_init. Probably
9143 we should just call reshape_init here? */
9144 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
9145 && TREE_CODE (initial_value) == CONSTRUCTOR
9146 && !vec_safe_is_empty (CONSTRUCTOR_ELTS (initial_value)))
9147 {
9148 vec<constructor_elt, va_gc> *v = CONSTRUCTOR_ELTS (initial_value);
9149 tree value = (*v)[0].value;
9150 STRIP_ANY_LOCATION_WRAPPER (value);
9151
9152 if (TREE_CODE (value) == STRING_CST
9153 && v->length () == 1)
9154 initial_value = value;
9155 }
9156
9157 /* If any of the elements are parameter packs, we can't actually
9158 complete this type now because the array size is dependent. */
9159 if (TREE_CODE (initial_value) == CONSTRUCTOR)
9160 {
9161 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value),
9162 i, value)
9163 {
9164 if (PACK_EXPANSION_P (value))
9165 return 0;
9166 }
9167 }
9168 }
9169
9170 failure = complete_array_type (ptype, initial_value, do_default);
9171
9172 /* We can create the array before the element type is complete, which
9173 means that we didn't have these two bits set in the original type
9174 either. In completing the type, we are expected to propagate these
9175 bits. See also complete_type which does the same thing for arrays
9176 of fixed size. */
9177 type = *ptype;
9178 if (type != error_mark_node && TYPE_DOMAIN (type))
9179 {
9180 elt_type = TREE_TYPE (type);
9181 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
9182 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
9183 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
9184 }
9185
9186 return failure;
9187 }
9188
9189 /* As above, but either give an error or reject zero-size arrays, depending
9190 on COMPLAIN. */
9191
9192 int
cp_complete_array_type_or_error(tree * ptype,tree initial_value,bool do_default,tsubst_flags_t complain)9193 cp_complete_array_type_or_error (tree *ptype, tree initial_value,
9194 bool do_default, tsubst_flags_t complain)
9195 {
9196 int failure;
9197 bool sfinae = !(complain & tf_error);
9198 /* In SFINAE context we can't be lenient about zero-size arrays. */
9199 if (sfinae)
9200 ++pedantic;
9201 failure = cp_complete_array_type (ptype, initial_value, do_default);
9202 if (sfinae)
9203 --pedantic;
9204 if (failure)
9205 {
9206 if (sfinae)
9207 /* Not an error. */;
9208 else if (failure == 1)
9209 error ("initializer fails to determine size of %qT", *ptype);
9210 else if (failure == 2)
9211 {
9212 if (do_default)
9213 error ("array size missing in %qT", *ptype);
9214 }
9215 else if (failure == 3)
9216 error ("zero-size array %qT", *ptype);
9217 *ptype = error_mark_node;
9218 }
9219 return failure;
9220 }
9221
9222 /* Return zero if something is declared to be a member of type
9223 CTYPE when in the context of CUR_TYPE. STRING is the error
9224 message to print in that case. Otherwise, quietly return 1. */
9225
9226 static int
member_function_or_else(tree ctype,tree cur_type,enum overload_flags flags)9227 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
9228 {
9229 if (ctype && ctype != cur_type)
9230 {
9231 if (flags == DTOR_FLAG)
9232 error ("destructor for alien class %qT cannot be a member", ctype);
9233 else
9234 error ("constructor for alien class %qT cannot be a member", ctype);
9235 return 0;
9236 }
9237 return 1;
9238 }
9239
9240 /* Subroutine of `grokdeclarator'. */
9241
9242 /* Generate errors possibly applicable for a given set of specifiers.
9243 This is for ARM $7.1.2. */
9244
9245 static void
bad_specifiers(tree object,enum bad_spec_place type,int virtualp,int quals,int inlinep,int friendp,int raises,const location_t * locations)9246 bad_specifiers (tree object,
9247 enum bad_spec_place type,
9248 int virtualp,
9249 int quals,
9250 int inlinep,
9251 int friendp,
9252 int raises,
9253 const location_t* locations)
9254 {
9255 switch (type)
9256 {
9257 case BSP_VAR:
9258 if (virtualp)
9259 error_at (locations[ds_virtual],
9260 "%qD declared as a %<virtual%> variable", object);
9261 if (quals)
9262 error ("%<const%> and %<volatile%> function specifiers on "
9263 "%qD invalid in variable declaration", object);
9264 break;
9265 case BSP_PARM:
9266 if (virtualp)
9267 error_at (locations[ds_virtual],
9268 "%qD declared as a %<virtual%> parameter", object);
9269 if (inlinep)
9270 error_at (locations[ds_inline],
9271 "%qD declared as an %<inline%> parameter", object);
9272 if (quals)
9273 error ("%<const%> and %<volatile%> function specifiers on "
9274 "%qD invalid in parameter declaration", object);
9275 break;
9276 case BSP_TYPE:
9277 if (virtualp)
9278 error_at (locations[ds_virtual],
9279 "%qD declared as a %<virtual%> type", object);
9280 if (inlinep)
9281 error_at (locations[ds_inline],
9282 "%qD declared as an %<inline%> type", object);
9283 if (quals)
9284 error ("%<const%> and %<volatile%> function specifiers on "
9285 "%qD invalid in type declaration", object);
9286 break;
9287 case BSP_FIELD:
9288 if (virtualp)
9289 error_at (locations[ds_virtual],
9290 "%qD declared as a %<virtual%> field", object);
9291 if (inlinep)
9292 error_at (locations[ds_inline],
9293 "%qD declared as an %<inline%> field", object);
9294 if (quals)
9295 error ("%<const%> and %<volatile%> function specifiers on "
9296 "%qD invalid in field declaration", object);
9297 break;
9298 default:
9299 gcc_unreachable();
9300 }
9301 if (friendp)
9302 error ("%q+D declared as a friend", object);
9303 if (raises
9304 && !flag_noexcept_type
9305 && (TREE_CODE (object) == TYPE_DECL
9306 || (!TYPE_PTRFN_P (TREE_TYPE (object))
9307 && !TYPE_REFFN_P (TREE_TYPE (object))
9308 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
9309 error ("%q+D declared with an exception specification", object);
9310 }
9311
9312 /* DECL is a member function or static data member and is presently
9313 being defined. Check that the definition is taking place in a
9314 valid namespace. */
9315
9316 static void
check_class_member_definition_namespace(tree decl)9317 check_class_member_definition_namespace (tree decl)
9318 {
9319 /* These checks only apply to member functions and static data
9320 members. */
9321 gcc_assert (VAR_OR_FUNCTION_DECL_P (decl));
9322 /* We check for problems with specializations in pt.c in
9323 check_specialization_namespace, where we can issue better
9324 diagnostics. */
9325 if (processing_specialization)
9326 return;
9327 /* We check this in check_explicit_instantiation_namespace. */
9328 if (processing_explicit_instantiation)
9329 return;
9330 /* [class.mfct]
9331
9332 A member function definition that appears outside of the
9333 class definition shall appear in a namespace scope enclosing
9334 the class definition.
9335
9336 [class.static.data]
9337
9338 The definition for a static data member shall appear in a
9339 namespace scope enclosing the member's class definition. */
9340 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
9341 permerror (input_location, "definition of %qD is not in namespace enclosing %qT",
9342 decl, DECL_CONTEXT (decl));
9343 }
9344
9345 /* Build a PARM_DECL for the "this" parameter of FN. TYPE is the
9346 METHOD_TYPE for a non-static member function; QUALS are the
9347 cv-qualifiers that apply to the function. */
9348
9349 tree
build_this_parm(tree fn,tree type,cp_cv_quals quals)9350 build_this_parm (tree fn, tree type, cp_cv_quals quals)
9351 {
9352 tree this_type;
9353 tree qual_type;
9354 tree parm;
9355 cp_cv_quals this_quals;
9356
9357 if (CLASS_TYPE_P (type))
9358 {
9359 this_type
9360 = cp_build_qualified_type (type, quals & ~TYPE_QUAL_RESTRICT);
9361 this_type = build_pointer_type (this_type);
9362 }
9363 else
9364 this_type = type_of_this_parm (type);
9365 /* The `this' parameter is implicitly `const'; it cannot be
9366 assigned to. */
9367 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
9368 qual_type = cp_build_qualified_type (this_type, this_quals);
9369 parm = build_artificial_parm (fn, this_identifier, qual_type);
9370 cp_apply_type_quals_to_decl (this_quals, parm);
9371 return parm;
9372 }
9373
9374 /* DECL is a static member function. Complain if it was declared
9375 with function-cv-quals. */
9376
9377 static void
check_static_quals(tree decl,cp_cv_quals quals)9378 check_static_quals (tree decl, cp_cv_quals quals)
9379 {
9380 if (quals != TYPE_UNQUALIFIED)
9381 error ("static member function %q#D declared with type qualifiers",
9382 decl);
9383 }
9384
9385 // Check that FN takes no arguments and returns bool.
9386 static void
check_concept_fn(tree fn)9387 check_concept_fn (tree fn)
9388 {
9389 // A constraint is nullary.
9390 if (DECL_ARGUMENTS (fn))
9391 error_at (DECL_SOURCE_LOCATION (fn),
9392 "concept %q#D declared with function parameters", fn);
9393
9394 // The declared return type of the concept shall be bool, and
9395 // it shall not be deduced from it definition.
9396 tree type = TREE_TYPE (TREE_TYPE (fn));
9397 if (is_auto (type))
9398 error_at (DECL_SOURCE_LOCATION (fn),
9399 "concept %q#D declared with a deduced return type", fn);
9400 else if (type != boolean_type_node)
9401 error_at (DECL_SOURCE_LOCATION (fn),
9402 "concept %q#D with non-%<bool%> return type %qT", fn, type);
9403 }
9404
9405 /* Helper function. Replace the temporary this parameter injected
9406 during cp_finish_omp_declare_simd with the real this parameter. */
9407
9408 static tree
declare_simd_adjust_this(tree * tp,int * walk_subtrees,void * data)9409 declare_simd_adjust_this (tree *tp, int *walk_subtrees, void *data)
9410 {
9411 tree this_parm = (tree) data;
9412 if (TREE_CODE (*tp) == PARM_DECL
9413 && DECL_NAME (*tp) == this_identifier
9414 && *tp != this_parm)
9415 *tp = this_parm;
9416 else if (TYPE_P (*tp))
9417 *walk_subtrees = 0;
9418 return NULL_TREE;
9419 }
9420
9421 /* CTYPE is class type, or null if non-class.
9422 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
9423 or METHOD_TYPE.
9424 DECLARATOR is the function's name.
9425 PARMS is a chain of PARM_DECLs for the function.
9426 VIRTUALP is truthvalue of whether the function is virtual or not.
9427 FLAGS are to be passed through to `grokclassfn'.
9428 QUALS are qualifiers indicating whether the function is `const'
9429 or `volatile'.
9430 RAISES is a list of exceptions that this function can raise.
9431 CHECK is 1 if we must find this method in CTYPE, 0 if we should
9432 not look, and -1 if we should not call `grokclassfn' at all.
9433
9434 SFK is the kind of special function (if any) for the new function.
9435
9436 Returns `NULL_TREE' if something goes wrong, after issuing
9437 applicable error messages. */
9438
9439 static tree
grokfndecl(tree ctype,tree type,tree declarator,tree parms,tree orig_declarator,const cp_decl_specifier_seq * declspecs,tree decl_reqs,int virtualp,enum overload_flags flags,cp_cv_quals quals,cp_ref_qualifier rqual,tree raises,int check,int friendp,int publicp,int inlinep,bool deletedp,special_function_kind sfk,bool funcdef_flag,bool late_return_type_p,int initialized,int template_count,tree in_namespace,tree * attrlist,location_t location)9440 grokfndecl (tree ctype,
9441 tree type,
9442 tree declarator,
9443 tree parms,
9444 tree orig_declarator,
9445 const cp_decl_specifier_seq *declspecs,
9446 tree decl_reqs,
9447 int virtualp,
9448 enum overload_flags flags,
9449 cp_cv_quals quals,
9450 cp_ref_qualifier rqual,
9451 tree raises,
9452 int check,
9453 int friendp,
9454 int publicp,
9455 int inlinep,
9456 bool deletedp,
9457 special_function_kind sfk,
9458 bool funcdef_flag,
9459 bool late_return_type_p,
9460 int initialized,
9461 int template_count,
9462 tree in_namespace,
9463 tree* attrlist,
9464 location_t location)
9465 {
9466 tree decl;
9467 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
9468 tree t;
9469
9470 if (location == UNKNOWN_LOCATION)
9471 location = input_location;
9472
9473 /* Was the concept specifier present? */
9474 bool concept_p = inlinep & 4;
9475
9476 /* Concept declarations must have a corresponding definition. */
9477 if (concept_p && !funcdef_flag)
9478 {
9479 error_at (location, "concept %qD has no definition", declarator);
9480 return NULL_TREE;
9481 }
9482
9483 type = build_cp_fntype_variant (type, rqual, raises, late_return_type_p);
9484
9485 decl = build_lang_decl_loc (location, FUNCTION_DECL, declarator, type);
9486
9487 /* Set the constraints on the declaration. */
9488 if (flag_concepts)
9489 {
9490 tree tmpl_reqs = NULL_TREE;
9491 tree ctx = friendp ? current_class_type : ctype;
9492 bool memtmpl = (processing_template_decl > template_class_depth (ctx));
9493 if (memtmpl)
9494 tmpl_reqs = TEMPLATE_PARMS_CONSTRAINTS (current_template_parms);
9495 tree ci = build_constraints (tmpl_reqs, decl_reqs);
9496 if (concept_p && ci)
9497 {
9498 error_at (location, "a function concept cannot be constrained");
9499 ci = NULL_TREE;
9500 }
9501 /* C++20 CA378: Remove non-templated constrained functions. */
9502 if (ci && !flag_concepts_ts
9503 && (!processing_template_decl
9504 || (friendp && !memtmpl && !initialized && !funcdef_flag)))
9505 {
9506 error_at (location, "constraints on a non-templated function");
9507 ci = NULL_TREE;
9508 }
9509 set_constraints (decl, ci);
9510 }
9511
9512 if (TREE_CODE (type) == METHOD_TYPE)
9513 {
9514 tree parm = build_this_parm (decl, type, quals);
9515 DECL_CHAIN (parm) = parms;
9516 parms = parm;
9517
9518 /* Allocate space to hold the vptr bit if needed. */
9519 SET_DECL_ALIGN (decl, MINIMUM_METHOD_BOUNDARY);
9520 }
9521
9522 DECL_ARGUMENTS (decl) = parms;
9523 for (t = parms; t; t = DECL_CHAIN (t))
9524 DECL_CONTEXT (t) = decl;
9525
9526 /* Propagate volatile out from type to decl. */
9527 if (TYPE_VOLATILE (type))
9528 TREE_THIS_VOLATILE (decl) = 1;
9529
9530 /* Setup decl according to sfk. */
9531 switch (sfk)
9532 {
9533 case sfk_constructor:
9534 case sfk_copy_constructor:
9535 case sfk_move_constructor:
9536 DECL_CXX_CONSTRUCTOR_P (decl) = 1;
9537 DECL_NAME (decl) = ctor_identifier;
9538 break;
9539 case sfk_destructor:
9540 DECL_CXX_DESTRUCTOR_P (decl) = 1;
9541 DECL_NAME (decl) = dtor_identifier;
9542 break;
9543 default:
9544 break;
9545 }
9546
9547 if (friendp && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
9548 {
9549 if (funcdef_flag)
9550 error_at (location,
9551 "defining explicit specialization %qD in friend declaration",
9552 orig_declarator);
9553 else
9554 {
9555 tree fns = TREE_OPERAND (orig_declarator, 0);
9556 tree args = TREE_OPERAND (orig_declarator, 1);
9557
9558 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
9559 {
9560 /* Something like `template <class T> friend void f<T>()'. */
9561 error_at (location,
9562 "invalid use of template-id %qD in declaration "
9563 "of primary template",
9564 orig_declarator);
9565 return NULL_TREE;
9566 }
9567
9568
9569 /* A friend declaration of the form friend void f<>(). Record
9570 the information in the TEMPLATE_ID_EXPR. */
9571 SET_DECL_IMPLICIT_INSTANTIATION (decl);
9572
9573 gcc_assert (identifier_p (fns) || OVL_P (fns));
9574 DECL_TEMPLATE_INFO (decl) = build_template_info (fns, args);
9575
9576 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
9577 if (TREE_PURPOSE (t)
9578 && TREE_CODE (TREE_PURPOSE (t)) == DEFERRED_PARSE)
9579 {
9580 error_at (defparse_location (TREE_PURPOSE (t)),
9581 "default arguments are not allowed in declaration "
9582 "of friend template specialization %qD",
9583 decl);
9584 return NULL_TREE;
9585 }
9586
9587 if (inlinep & 1)
9588 {
9589 error_at (declspecs->locations[ds_inline],
9590 "%<inline%> is not allowed in declaration of friend "
9591 "template specialization %qD",
9592 decl);
9593 return NULL_TREE;
9594 }
9595 }
9596 }
9597
9598 /* C++17 11.3.6/4: "If a friend declaration specifies a default argument
9599 expression, that declaration shall be a definition..." */
9600 if (friendp && !funcdef_flag)
9601 {
9602 for (tree t = FUNCTION_FIRST_USER_PARMTYPE (decl);
9603 t && t != void_list_node; t = TREE_CHAIN (t))
9604 if (TREE_PURPOSE (t))
9605 {
9606 permerror (DECL_SOURCE_LOCATION (decl),
9607 "friend declaration of %qD specifies default "
9608 "arguments and isn%'t a definition", decl);
9609 break;
9610 }
9611 }
9612
9613 /* FIXME: For now. */
9614 if (virtualp && (inlinep & 8) != 0)
9615 {
9616 sorry_at (DECL_SOURCE_LOCATION (decl),
9617 "%<virtual%> %<consteval%> method %qD not supported yet",
9618 decl);
9619 inlinep &= ~8;
9620 }
9621
9622 /* If this decl has namespace scope, set that up. */
9623 if (in_namespace)
9624 set_decl_namespace (decl, in_namespace, friendp);
9625 else if (!ctype)
9626 DECL_CONTEXT (decl) = FROB_CONTEXT (current_decl_namespace ());
9627
9628 /* `main' and builtins have implicit 'C' linkage. */
9629 if (ctype == NULL_TREE
9630 && DECL_FILE_SCOPE_P (decl)
9631 && current_lang_name == lang_name_cplusplus
9632 && (MAIN_NAME_P (declarator)
9633 || (IDENTIFIER_LENGTH (declarator) > 10
9634 && IDENTIFIER_POINTER (declarator)[0] == '_'
9635 && IDENTIFIER_POINTER (declarator)[1] == '_'
9636 && strncmp (IDENTIFIER_POINTER (declarator)+2,
9637 "builtin_", 8) == 0)
9638 || (targetcm.cxx_implicit_extern_c
9639 && (targetcm.cxx_implicit_extern_c
9640 (IDENTIFIER_POINTER (declarator))))))
9641 SET_DECL_LANGUAGE (decl, lang_c);
9642
9643 /* Should probably propagate const out from type to decl I bet (mrs). */
9644 if (staticp)
9645 {
9646 DECL_STATIC_FUNCTION_P (decl) = 1;
9647 DECL_CONTEXT (decl) = ctype;
9648 }
9649
9650 if (deletedp)
9651 DECL_DELETED_FN (decl) = 1;
9652
9653 if (ctype)
9654 {
9655 DECL_CONTEXT (decl) = ctype;
9656 if (funcdef_flag)
9657 check_class_member_definition_namespace (decl);
9658 }
9659
9660 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
9661 {
9662 if (PROCESSING_REAL_TEMPLATE_DECL_P())
9663 error_at (location, "cannot declare %<::main%> to be a template");
9664 if (inlinep & 1)
9665 error_at (declspecs->locations[ds_inline],
9666 "cannot declare %<::main%> to be inline");
9667 if (inlinep & 2)
9668 error_at (declspecs->locations[ds_constexpr],
9669 "cannot declare %<::main%> to be %qs", "constexpr");
9670 if (inlinep & 8)
9671 error_at (declspecs->locations[ds_consteval],
9672 "cannot declare %<::main%> to be %qs", "consteval");
9673 if (!publicp)
9674 error_at (location, "cannot declare %<::main%> to be static");
9675 inlinep = 0;
9676 publicp = 1;
9677 }
9678
9679 /* Members of anonymous types and local classes have no linkage; make
9680 them internal. If a typedef is made later, this will be changed. */
9681 if (ctype && (!TREE_PUBLIC (TYPE_MAIN_DECL (ctype))
9682 || decl_function_context (TYPE_MAIN_DECL (ctype))))
9683 publicp = 0;
9684
9685 if (publicp && cxx_dialect == cxx98)
9686 {
9687 /* [basic.link]: A name with no linkage (notably, the name of a class
9688 or enumeration declared in a local scope) shall not be used to
9689 declare an entity with linkage.
9690
9691 DR 757 relaxes this restriction for C++0x. */
9692 no_linkage_error (decl);
9693 }
9694
9695 TREE_PUBLIC (decl) = publicp;
9696 if (! publicp)
9697 {
9698 DECL_INTERFACE_KNOWN (decl) = 1;
9699 DECL_NOT_REALLY_EXTERN (decl) = 1;
9700 }
9701
9702 /* If the declaration was declared inline, mark it as such. */
9703 if (inlinep)
9704 {
9705 DECL_DECLARED_INLINE_P (decl) = 1;
9706 if (publicp)
9707 DECL_COMDAT (decl) = 1;
9708 }
9709 if (inlinep & 2)
9710 DECL_DECLARED_CONSTEXPR_P (decl) = true;
9711 else if (inlinep & 8)
9712 {
9713 DECL_DECLARED_CONSTEXPR_P (decl) = true;
9714 SET_DECL_IMMEDIATE_FUNCTION_P (decl);
9715 }
9716
9717 // If the concept declaration specifier was found, check
9718 // that the declaration satisfies the necessary requirements.
9719 if (concept_p)
9720 {
9721 DECL_DECLARED_CONCEPT_P (decl) = true;
9722 check_concept_fn (decl);
9723 }
9724
9725 DECL_EXTERNAL (decl) = 1;
9726 if (TREE_CODE (type) == FUNCTION_TYPE)
9727 {
9728 if (quals || rqual)
9729 TREE_TYPE (decl) = apply_memfn_quals (TREE_TYPE (decl),
9730 TYPE_UNQUALIFIED,
9731 REF_QUAL_NONE);
9732
9733 if (quals)
9734 {
9735 error (ctype
9736 ? G_("static member function %qD cannot have cv-qualifier")
9737 : G_("non-member function %qD cannot have cv-qualifier"),
9738 decl);
9739 quals = TYPE_UNQUALIFIED;
9740 }
9741
9742 if (rqual)
9743 {
9744 error (ctype
9745 ? G_("static member function %qD cannot have ref-qualifier")
9746 : G_("non-member function %qD cannot have ref-qualifier"),
9747 decl);
9748 rqual = REF_QUAL_NONE;
9749 }
9750 }
9751
9752 if (deduction_guide_p (decl))
9753 {
9754 if (!DECL_NAMESPACE_SCOPE_P (decl))
9755 {
9756 error_at (location, "deduction guide %qD must be declared at "
9757 "namespace scope", decl);
9758 return NULL_TREE;
9759 }
9760 tree type = TREE_TYPE (DECL_NAME (decl));
9761 if (in_namespace == NULL_TREE
9762 && CP_DECL_CONTEXT (decl) != CP_TYPE_CONTEXT (type))
9763 {
9764 error_at (location, "deduction guide %qD must be declared in the "
9765 "same scope as %qT", decl, type);
9766 inform (location_of (type), " declared here");
9767 return NULL_TREE;
9768 }
9769 if (funcdef_flag)
9770 error_at (location,
9771 "deduction guide %qD must not have a function body", decl);
9772 }
9773 else if (IDENTIFIER_ANY_OP_P (DECL_NAME (decl))
9774 && !grok_op_properties (decl, /*complain=*/true))
9775 return NULL_TREE;
9776 else if (UDLIT_OPER_P (DECL_NAME (decl)))
9777 {
9778 bool long_long_unsigned_p;
9779 bool long_double_p;
9780 const char *suffix = NULL;
9781 /* [over.literal]/6: Literal operators shall not have C linkage. */
9782 if (DECL_LANGUAGE (decl) == lang_c)
9783 {
9784 error_at (location, "literal operator with C linkage");
9785 maybe_show_extern_c_location ();
9786 return NULL_TREE;
9787 }
9788
9789 if (DECL_NAMESPACE_SCOPE_P (decl))
9790 {
9791 if (!check_literal_operator_args (decl, &long_long_unsigned_p,
9792 &long_double_p))
9793 {
9794 error_at (location, "%qD has invalid argument list", decl);
9795 return NULL_TREE;
9796 }
9797
9798 suffix = UDLIT_OP_SUFFIX (DECL_NAME (decl));
9799 if (long_long_unsigned_p)
9800 {
9801 if (cpp_interpret_int_suffix (parse_in, suffix, strlen (suffix)))
9802 warning_at (location, 0, "integer suffix %qs"
9803 " shadowed by implementation", suffix);
9804 }
9805 else if (long_double_p)
9806 {
9807 if (cpp_interpret_float_suffix (parse_in, suffix, strlen (suffix)))
9808 warning_at (location, 0, "floating-point suffix %qs"
9809 " shadowed by implementation", suffix);
9810 }
9811 /* 17.6.3.3.5 */
9812 if (suffix[0] != '_'
9813 && !current_function_decl && !(friendp && !funcdef_flag))
9814 warning_at (location, OPT_Wliteral_suffix,
9815 "literal operator suffixes not preceded by %<_%>"
9816 " are reserved for future standardization");
9817 }
9818 else
9819 {
9820 error_at (location, "%qD must be a non-member function", decl);
9821 return NULL_TREE;
9822 }
9823 }
9824
9825 if (funcdef_flag)
9826 /* Make the init_value nonzero so pushdecl knows this is not
9827 tentative. error_mark_node is replaced later with the BLOCK. */
9828 DECL_INITIAL (decl) = error_mark_node;
9829
9830 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
9831 TREE_NOTHROW (decl) = 1;
9832
9833 if (flag_openmp || flag_openmp_simd)
9834 {
9835 /* Adjust "omp declare simd" attributes. */
9836 tree ods = lookup_attribute ("omp declare simd", *attrlist);
9837 if (ods)
9838 {
9839 tree attr;
9840 for (attr = ods; attr;
9841 attr = lookup_attribute ("omp declare simd", TREE_CHAIN (attr)))
9842 {
9843 if (TREE_CODE (type) == METHOD_TYPE)
9844 walk_tree (&TREE_VALUE (attr), declare_simd_adjust_this,
9845 DECL_ARGUMENTS (decl), NULL);
9846 if (TREE_VALUE (attr) != NULL_TREE)
9847 {
9848 tree cl = TREE_VALUE (TREE_VALUE (attr));
9849 cl = c_omp_declare_simd_clauses_to_numbers
9850 (DECL_ARGUMENTS (decl), cl);
9851 if (cl)
9852 TREE_VALUE (TREE_VALUE (attr)) = cl;
9853 else
9854 TREE_VALUE (attr) = NULL_TREE;
9855 }
9856 }
9857 }
9858 }
9859
9860 /* Caller will do the rest of this. */
9861 if (check < 0)
9862 return decl;
9863
9864 if (ctype != NULL_TREE)
9865 grokclassfn (ctype, decl, flags);
9866
9867 /* 12.4/3 */
9868 if (cxx_dialect >= cxx11
9869 && DECL_DESTRUCTOR_P (decl)
9870 && !TYPE_BEING_DEFINED (DECL_CONTEXT (decl))
9871 && !processing_template_decl)
9872 deduce_noexcept_on_destructor (decl);
9873
9874 decl = check_explicit_specialization (orig_declarator, decl,
9875 template_count,
9876 2 * funcdef_flag +
9877 4 * (friendp != 0) +
9878 8 * concept_p,
9879 *attrlist);
9880 if (decl == error_mark_node)
9881 return NULL_TREE;
9882
9883 if (DECL_STATIC_FUNCTION_P (decl))
9884 check_static_quals (decl, quals);
9885
9886 if (attrlist)
9887 {
9888 cplus_decl_attributes (&decl, *attrlist, 0);
9889 *attrlist = NULL_TREE;
9890 }
9891
9892 /* Check main's type after attributes have been applied. */
9893 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
9894 {
9895 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
9896 integer_type_node))
9897 {
9898 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
9899 tree newtype;
9900 error_at (declspecs->locations[ds_type_spec],
9901 "%<::main%> must return %<int%>");
9902 newtype = build_function_type (integer_type_node, oldtypeargs);
9903 TREE_TYPE (decl) = newtype;
9904 }
9905 if (warn_main)
9906 check_main_parameter_types (decl);
9907 }
9908
9909 if (ctype != NULL_TREE && check)
9910 {
9911 tree old_decl = check_classfn (ctype, decl,
9912 (processing_template_decl
9913 > template_class_depth (ctype))
9914 ? current_template_parms
9915 : NULL_TREE);
9916
9917 if (old_decl == error_mark_node)
9918 return NULL_TREE;
9919
9920 if (old_decl)
9921 {
9922 tree ok;
9923 tree pushed_scope;
9924
9925 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
9926 /* Because grokfndecl is always supposed to return a
9927 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
9928 here. We depend on our callers to figure out that its
9929 really a template that's being returned. */
9930 old_decl = DECL_TEMPLATE_RESULT (old_decl);
9931
9932 if (DECL_STATIC_FUNCTION_P (old_decl)
9933 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
9934 {
9935 /* Remove the `this' parm added by grokclassfn. */
9936 revert_static_member_fn (decl);
9937 check_static_quals (decl, quals);
9938 }
9939 if (DECL_ARTIFICIAL (old_decl))
9940 {
9941 error ("definition of implicitly-declared %qD", old_decl);
9942 return NULL_TREE;
9943 }
9944 else if (DECL_DEFAULTED_FN (old_decl))
9945 {
9946 error ("definition of explicitly-defaulted %q+D", decl);
9947 inform (DECL_SOURCE_LOCATION (old_decl),
9948 "%q#D explicitly defaulted here", old_decl);
9949 return NULL_TREE;
9950 }
9951
9952 /* Since we've smashed OLD_DECL to its
9953 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
9954 if (TREE_CODE (decl) == TEMPLATE_DECL)
9955 decl = DECL_TEMPLATE_RESULT (decl);
9956
9957 /* Attempt to merge the declarations. This can fail, in
9958 the case of some invalid specialization declarations. */
9959 pushed_scope = push_scope (ctype);
9960 ok = duplicate_decls (decl, old_decl, friendp);
9961 if (pushed_scope)
9962 pop_scope (pushed_scope);
9963 if (!ok)
9964 {
9965 error ("no %q#D member function declared in class %qT",
9966 decl, ctype);
9967 return NULL_TREE;
9968 }
9969 if (ok == error_mark_node)
9970 return NULL_TREE;
9971 return old_decl;
9972 }
9973 }
9974
9975 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
9976 return NULL_TREE;
9977
9978 if (ctype == NULL_TREE || check)
9979 return decl;
9980
9981 if (virtualp)
9982 DECL_VIRTUAL_P (decl) = 1;
9983
9984 return decl;
9985 }
9986
9987 /* decl is a FUNCTION_DECL.
9988 specifiers are the parsed virt-specifiers.
9989
9990 Set flags to reflect the virt-specifiers.
9991
9992 Returns decl. */
9993
9994 static tree
set_virt_specifiers(tree decl,cp_virt_specifiers specifiers)9995 set_virt_specifiers (tree decl, cp_virt_specifiers specifiers)
9996 {
9997 if (decl == NULL_TREE)
9998 return decl;
9999 if (specifiers & VIRT_SPEC_OVERRIDE)
10000 DECL_OVERRIDE_P (decl) = 1;
10001 if (specifiers & VIRT_SPEC_FINAL)
10002 DECL_FINAL_P (decl) = 1;
10003 return decl;
10004 }
10005
10006 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
10007 the linkage that DECL will receive in the object file. */
10008
10009 static void
set_linkage_for_static_data_member(tree decl)10010 set_linkage_for_static_data_member (tree decl)
10011 {
10012 /* A static data member always has static storage duration and
10013 external linkage. Note that static data members are forbidden in
10014 local classes -- the only situation in which a class has
10015 non-external linkage. */
10016 TREE_PUBLIC (decl) = 1;
10017 TREE_STATIC (decl) = 1;
10018 /* For non-template classes, static data members are always put
10019 out in exactly those files where they are defined, just as
10020 with ordinary namespace-scope variables. */
10021 if (!processing_template_decl)
10022 DECL_INTERFACE_KNOWN (decl) = 1;
10023 }
10024
10025 /* Create a VAR_DECL named NAME with the indicated TYPE.
10026
10027 If SCOPE is non-NULL, it is the class type or namespace containing
10028 the variable. If SCOPE is NULL, the variable should is created in
10029 the innermost enclosing scope. */
10030
10031 static tree
grokvardecl(tree type,tree name,tree orig_declarator,const cp_decl_specifier_seq * declspecs,int initialized,int type_quals,int inlinep,bool conceptp,int template_count,tree scope,location_t location)10032 grokvardecl (tree type,
10033 tree name,
10034 tree orig_declarator,
10035 const cp_decl_specifier_seq *declspecs,
10036 int initialized,
10037 int type_quals,
10038 int inlinep,
10039 bool conceptp,
10040 int template_count,
10041 tree scope,
10042 location_t location)
10043 {
10044 tree decl;
10045 tree explicit_scope;
10046
10047 gcc_assert (!name || identifier_p (name));
10048
10049 bool constp = (type_quals & TYPE_QUAL_CONST) != 0;
10050 bool volatilep = (type_quals & TYPE_QUAL_VOLATILE) != 0;
10051
10052 /* Compute the scope in which to place the variable, but remember
10053 whether or not that scope was explicitly specified by the user. */
10054 explicit_scope = scope;
10055 if (!scope)
10056 {
10057 /* An explicit "extern" specifier indicates a namespace-scope
10058 variable. */
10059 if (declspecs->storage_class == sc_extern)
10060 scope = current_decl_namespace ();
10061 else if (!at_function_scope_p ())
10062 scope = current_scope ();
10063 }
10064
10065 if (scope
10066 && (/* If the variable is a namespace-scope variable declared in a
10067 template, we need DECL_LANG_SPECIFIC. */
10068 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
10069 /* Similarly for namespace-scope variables with language linkage
10070 other than C++. */
10071 || (TREE_CODE (scope) == NAMESPACE_DECL
10072 && current_lang_name != lang_name_cplusplus)
10073 /* Similarly for static data members. */
10074 || TYPE_P (scope)
10075 /* Similarly for explicit specializations. */
10076 || (orig_declarator
10077 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)))
10078 decl = build_lang_decl_loc (location, VAR_DECL, name, type);
10079 else
10080 decl = build_decl (location, VAR_DECL, name, type);
10081
10082 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
10083 set_decl_namespace (decl, explicit_scope, 0);
10084 else
10085 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
10086
10087 if (declspecs->storage_class == sc_extern)
10088 {
10089 DECL_THIS_EXTERN (decl) = 1;
10090 DECL_EXTERNAL (decl) = !initialized;
10091 }
10092
10093 if (DECL_CLASS_SCOPE_P (decl))
10094 {
10095 set_linkage_for_static_data_member (decl);
10096 /* This function is only called with out-of-class definitions. */
10097 DECL_EXTERNAL (decl) = 0;
10098 check_class_member_definition_namespace (decl);
10099 }
10100 /* At top level, either `static' or no s.c. makes a definition
10101 (perhaps tentative), and absence of `static' makes it public. */
10102 else if (toplevel_bindings_p ())
10103 {
10104 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
10105 && (DECL_THIS_EXTERN (decl)
10106 || ! constp
10107 || volatilep
10108 || inlinep));
10109 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
10110 }
10111 /* Not at top level, only `static' makes a static definition. */
10112 else
10113 {
10114 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
10115 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
10116 }
10117
10118 if (decl_spec_seq_has_spec_p (declspecs, ds_thread))
10119 {
10120 if (DECL_EXTERNAL (decl) || TREE_STATIC (decl))
10121 {
10122 CP_DECL_THREAD_LOCAL_P (decl) = true;
10123 if (!processing_template_decl)
10124 set_decl_tls_model (decl, decl_default_tls_model (decl));
10125 }
10126 if (declspecs->gnu_thread_keyword_p)
10127 SET_DECL_GNU_TLS_P (decl);
10128 }
10129
10130 /* If the type of the decl has no linkage, make sure that we'll
10131 notice that in mark_used. */
10132 if (cxx_dialect > cxx98
10133 && decl_linkage (decl) != lk_none
10134 && DECL_LANG_SPECIFIC (decl) == NULL
10135 && !DECL_EXTERN_C_P (decl)
10136 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
10137 retrofit_lang_decl (decl);
10138
10139 if (TREE_PUBLIC (decl))
10140 {
10141 /* [basic.link]: A name with no linkage (notably, the name of a class
10142 or enumeration declared in a local scope) shall not be used to
10143 declare an entity with linkage.
10144
10145 DR 757 relaxes this restriction for C++0x. */
10146 if (cxx_dialect < cxx11)
10147 no_linkage_error (decl);
10148 }
10149 else
10150 DECL_INTERFACE_KNOWN (decl) = 1;
10151
10152 if (DECL_NAME (decl)
10153 && MAIN_NAME_P (DECL_NAME (decl))
10154 && scope == global_namespace)
10155 error_at (DECL_SOURCE_LOCATION (decl),
10156 "cannot declare %<::main%> to be a global variable");
10157
10158 /* Check that the variable can be safely declared as a concept.
10159 Note that this also forbids explicit specializations. */
10160 if (conceptp)
10161 {
10162 if (!processing_template_decl)
10163 {
10164 error_at (declspecs->locations[ds_concept],
10165 "a non-template variable cannot be %<concept%>");
10166 return NULL_TREE;
10167 }
10168 else
10169 DECL_DECLARED_CONCEPT_P (decl) = true;
10170 if (!same_type_ignoring_top_level_qualifiers_p (type, boolean_type_node))
10171 error_at (declspecs->locations[ds_type_spec],
10172 "concept must have type %<bool%>");
10173 if (TEMPLATE_PARMS_CONSTRAINTS (current_template_parms))
10174 {
10175 error_at (location, "a variable concept cannot be constrained");
10176 TEMPLATE_PARMS_CONSTRAINTS (current_template_parms) = NULL_TREE;
10177 }
10178 }
10179 else if (flag_concepts
10180 && processing_template_decl > template_class_depth (scope))
10181 {
10182 tree reqs = TEMPLATE_PARMS_CONSTRAINTS (current_template_parms);
10183 tree ci = build_constraints (reqs, NULL_TREE);
10184
10185 set_constraints (decl, ci);
10186 }
10187
10188 // Handle explicit specializations and instantiations of variable templates.
10189 if (orig_declarator)
10190 decl = check_explicit_specialization (orig_declarator, decl,
10191 template_count, conceptp * 8);
10192
10193 return decl != error_mark_node ? decl : NULL_TREE;
10194 }
10195
10196 /* Create and return a canonical pointer to member function type, for
10197 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
10198
10199 tree
build_ptrmemfunc_type(tree type)10200 build_ptrmemfunc_type (tree type)
10201 {
10202 tree field, fields;
10203 tree t;
10204
10205 if (type == error_mark_node)
10206 return type;
10207
10208 /* Make sure that we always have the unqualified pointer-to-member
10209 type first. */
10210 if (cp_cv_quals quals = cp_type_quals (type))
10211 {
10212 tree unqual = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
10213 return cp_build_qualified_type (unqual, quals);
10214 }
10215
10216 /* If a canonical type already exists for this type, use it. We use
10217 this method instead of type_hash_canon, because it only does a
10218 simple equality check on the list of field members. */
10219
10220 t = TYPE_PTRMEMFUNC_TYPE (type);
10221 if (t)
10222 return t;
10223
10224 t = make_node (RECORD_TYPE);
10225
10226 /* Let the front end know this is a pointer to member function. */
10227 TYPE_PTRMEMFUNC_FLAG (t) = 1;
10228
10229 field = build_decl (input_location, FIELD_DECL, pfn_identifier, type);
10230 DECL_NONADDRESSABLE_P (field) = 1;
10231 fields = field;
10232
10233 field = build_decl (input_location, FIELD_DECL, delta_identifier,
10234 delta_type_node);
10235 DECL_NONADDRESSABLE_P (field) = 1;
10236 DECL_CHAIN (field) = fields;
10237 fields = field;
10238
10239 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
10240
10241 /* Zap out the name so that the back end will give us the debugging
10242 information for this anonymous RECORD_TYPE. */
10243 TYPE_NAME (t) = NULL_TREE;
10244
10245 /* Cache this pointer-to-member type so that we can find it again
10246 later. */
10247 TYPE_PTRMEMFUNC_TYPE (type) = t;
10248
10249 if (TYPE_STRUCTURAL_EQUALITY_P (type))
10250 SET_TYPE_STRUCTURAL_EQUALITY (t);
10251 else if (TYPE_CANONICAL (type) != type)
10252 TYPE_CANONICAL (t) = build_ptrmemfunc_type (TYPE_CANONICAL (type));
10253
10254 return t;
10255 }
10256
10257 /* Create and return a pointer to data member type. */
10258
10259 tree
build_ptrmem_type(tree class_type,tree member_type)10260 build_ptrmem_type (tree class_type, tree member_type)
10261 {
10262 if (TREE_CODE (member_type) == METHOD_TYPE)
10263 {
10264 cp_cv_quals quals = type_memfn_quals (member_type);
10265 cp_ref_qualifier rqual = type_memfn_rqual (member_type);
10266 member_type = build_memfn_type (member_type, class_type, quals, rqual);
10267 return build_ptrmemfunc_type (build_pointer_type (member_type));
10268 }
10269 else
10270 {
10271 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
10272 return build_offset_type (class_type, member_type);
10273 }
10274 }
10275
10276 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
10277 Check to see that the definition is valid. Issue appropriate error
10278 messages. */
10279
10280 static void
check_static_variable_definition(tree decl,tree type)10281 check_static_variable_definition (tree decl, tree type)
10282 {
10283 /* Avoid redundant diagnostics on out-of-class definitions. */
10284 if (!current_class_type || !TYPE_BEING_DEFINED (current_class_type))
10285 ;
10286 /* Can't check yet if we don't know the type. */
10287 else if (dependent_type_p (type))
10288 ;
10289 /* If DECL is declared constexpr, we'll do the appropriate checks
10290 in check_initializer. Similarly for inline static data members. */
10291 else if (DECL_P (decl)
10292 && (DECL_DECLARED_CONSTEXPR_P (decl)
10293 || undeduced_auto_decl (decl)
10294 || DECL_VAR_DECLARED_INLINE_P (decl)))
10295 ;
10296 else if (cxx_dialect >= cxx11 && !INTEGRAL_OR_ENUMERATION_TYPE_P (type))
10297 {
10298 if (!COMPLETE_TYPE_P (type))
10299 error_at (DECL_SOURCE_LOCATION (decl),
10300 "in-class initialization of static data member %q#D of "
10301 "incomplete type", decl);
10302 else if (literal_type_p (type))
10303 permerror (DECL_SOURCE_LOCATION (decl),
10304 "%<constexpr%> needed for in-class initialization of "
10305 "static data member %q#D of non-integral type", decl);
10306 else
10307 error_at (DECL_SOURCE_LOCATION (decl),
10308 "in-class initialization of static data member %q#D of "
10309 "non-literal type", decl);
10310 }
10311 /* Motion 10 at San Diego: If a static const integral data member is
10312 initialized with an integral constant expression, the initializer
10313 may appear either in the declaration (within the class), or in
10314 the definition, but not both. If it appears in the class, the
10315 member is a member constant. The file-scope definition is always
10316 required. */
10317 else if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
10318 error_at (DECL_SOURCE_LOCATION (decl),
10319 "invalid in-class initialization of static data member "
10320 "of non-integral type %qT",
10321 type);
10322 else if (!CP_TYPE_CONST_P (type))
10323 error_at (DECL_SOURCE_LOCATION (decl),
10324 "ISO C++ forbids in-class initialization of non-const "
10325 "static member %qD",
10326 decl);
10327 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type))
10328 pedwarn (DECL_SOURCE_LOCATION (decl), OPT_Wpedantic,
10329 "ISO C++ forbids initialization of member constant "
10330 "%qD of non-integral type %qT", decl, type);
10331 }
10332
10333 /* *expr_p is part of the TYPE_SIZE of a variably-sized array. If any
10334 SAVE_EXPRs in *expr_p wrap expressions with side-effects, break those
10335 expressions out into temporary variables so that walk_tree doesn't
10336 step into them (c++/15764). */
10337
10338 static tree
stabilize_save_expr_r(tree * expr_p,int * walk_subtrees,void * data)10339 stabilize_save_expr_r (tree *expr_p, int *walk_subtrees, void *data)
10340 {
10341 hash_set<tree> *pset = (hash_set<tree> *)data;
10342 tree expr = *expr_p;
10343 if (TREE_CODE (expr) == SAVE_EXPR)
10344 {
10345 tree op = TREE_OPERAND (expr, 0);
10346 cp_walk_tree (&op, stabilize_save_expr_r, data, pset);
10347 if (TREE_SIDE_EFFECTS (op))
10348 TREE_OPERAND (expr, 0) = get_temp_regvar (TREE_TYPE (op), op);
10349 *walk_subtrees = 0;
10350 }
10351 else if (!EXPR_P (expr) || !TREE_SIDE_EFFECTS (expr))
10352 *walk_subtrees = 0;
10353 return NULL;
10354 }
10355
10356 /* Entry point for the above. */
10357
10358 static void
stabilize_vla_size(tree size)10359 stabilize_vla_size (tree size)
10360 {
10361 hash_set<tree> pset;
10362 /* Break out any function calls into temporary variables. */
10363 cp_walk_tree (&size, stabilize_save_expr_r, &pset, &pset);
10364 }
10365
10366 /* Reduce a SIZEOF_EXPR to its value. */
10367
10368 tree
fold_sizeof_expr(tree t)10369 fold_sizeof_expr (tree t)
10370 {
10371 tree r;
10372 if (SIZEOF_EXPR_TYPE_P (t))
10373 r = cxx_sizeof_or_alignof_type (EXPR_LOCATION (t),
10374 TREE_TYPE (TREE_OPERAND (t, 0)),
10375 SIZEOF_EXPR, false, false);
10376 else if (TYPE_P (TREE_OPERAND (t, 0)))
10377 r = cxx_sizeof_or_alignof_type (EXPR_LOCATION (t),
10378 TREE_OPERAND (t, 0), SIZEOF_EXPR,
10379 false, false);
10380 else
10381 r = cxx_sizeof_or_alignof_expr (EXPR_LOCATION (t),
10382 TREE_OPERAND (t, 0), SIZEOF_EXPR,
10383 false);
10384 if (r == error_mark_node)
10385 r = size_one_node;
10386 return r;
10387 }
10388
10389 /* Given the SIZE (i.e., number of elements) in an array, compute
10390 an appropriate index type for the array. If non-NULL, NAME is
10391 the name of the entity being declared. */
10392
10393 static tree
compute_array_index_type_loc(location_t name_loc,tree name,tree size,tsubst_flags_t complain)10394 compute_array_index_type_loc (location_t name_loc, tree name, tree size,
10395 tsubst_flags_t complain)
10396 {
10397 if (error_operand_p (size))
10398 return error_mark_node;
10399
10400 /* The type of the index being computed. */
10401 tree itype;
10402
10403 /* The original numeric size as seen in the source code before
10404 conversion to size_t. */
10405 tree origsize = size;
10406
10407 location_t loc = cp_expr_loc_or_loc (size, name ? name_loc : input_location);
10408
10409 if (!type_dependent_expression_p (size))
10410 {
10411 origsize = size = mark_rvalue_use (size);
10412
10413 if (cxx_dialect < cxx11 && TREE_CODE (size) == NOP_EXPR
10414 && TREE_SIDE_EFFECTS (size))
10415 /* In C++98, we mark a non-constant array bound with a magic
10416 NOP_EXPR with TREE_SIDE_EFFECTS; don't fold in that case. */;
10417 else
10418 {
10419 size = build_converted_constant_expr (size_type_node, size, complain);
10420 /* Pedantically a constant expression is required here and so
10421 __builtin_is_constant_evaluated () should fold to true if it
10422 is successfully folded into a constant. */
10423 size = fold_non_dependent_expr (size, complain,
10424 /*manifestly_const_eval=*/true);
10425
10426 if (!TREE_CONSTANT (size))
10427 size = origsize;
10428 }
10429
10430 if (error_operand_p (size))
10431 return error_mark_node;
10432
10433 /* The array bound must be an integer type. */
10434 tree type = TREE_TYPE (size);
10435 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
10436 {
10437 if (!(complain & tf_error))
10438 return error_mark_node;
10439 if (name)
10440 error_at (loc, "size of array %qD has non-integral type %qT",
10441 name, type);
10442 else
10443 error_at (loc, "size of array has non-integral type %qT", type);
10444 size = integer_one_node;
10445 }
10446 }
10447
10448 /* A type is dependent if it is...an array type constructed from any
10449 dependent type or whose size is specified by a constant expression
10450 that is value-dependent. */
10451 /* We can only call value_dependent_expression_p on integral constant
10452 expressions; treat non-constant expressions as dependent, too. */
10453 if (processing_template_decl
10454 && (!TREE_CONSTANT (size) || value_dependent_expression_p (size)))
10455 {
10456 /* We cannot do any checking for a SIZE that isn't known to be
10457 constant. Just build the index type and mark that it requires
10458 structural equality checks. */
10459 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
10460 size, size_one_node));
10461 TYPE_DEPENDENT_P (itype) = 1;
10462 TYPE_DEPENDENT_P_VALID (itype) = 1;
10463 SET_TYPE_STRUCTURAL_EQUALITY (itype);
10464 return itype;
10465 }
10466
10467 if (TREE_CODE (size) != INTEGER_CST)
10468 {
10469 tree folded = cp_fully_fold (size);
10470 if (TREE_CODE (folded) == INTEGER_CST)
10471 {
10472 if (name)
10473 pedwarn (loc, OPT_Wpedantic, "size of array %qD is not an "
10474 "integral constant-expression", name);
10475 else
10476 pedwarn (loc, OPT_Wpedantic,
10477 "size of array is not an integral constant-expression");
10478 }
10479 if (TREE_CONSTANT (size) && !TREE_CONSTANT (folded))
10480 /* We might have lost the TREE_CONSTANT flag e.g. when we are
10481 folding a conversion from a pointer to integral type. In that
10482 case issue an error below and don't treat this as a VLA. */;
10483 else
10484 /* Use the folded result for VLAs, too; it will have resolved
10485 SIZEOF_EXPR. */
10486 size = folded;
10487 }
10488
10489 /* Normally, the array-bound will be a constant. */
10490 if (TREE_CODE (size) == INTEGER_CST)
10491 {
10492 /* The size to use in diagnostics that reflects the constant
10493 size used in the source, rather than SIZE massaged above. */
10494 tree diagsize = size;
10495
10496 /* If the original size before conversion to size_t was signed
10497 and negative, convert it to ssizetype to restore the sign. */
10498 if (!TYPE_UNSIGNED (TREE_TYPE (origsize))
10499 && TREE_CODE (size) == INTEGER_CST
10500 && tree_int_cst_sign_bit (size))
10501 {
10502 diagsize = fold_convert (ssizetype, size);
10503
10504 /* Clear the overflow bit that may have been set as a result
10505 of the conversion from the sizetype of the new size to
10506 ssizetype. */
10507 TREE_OVERFLOW (diagsize) = false;
10508 }
10509
10510 /* Verify that the array has a positive number of elements
10511 and issue the appropriate diagnostic if it doesn't. */
10512 if (!valid_array_size_p (loc, diagsize, name, (complain & tf_error)))
10513 {
10514 if (!(complain & tf_error))
10515 return error_mark_node;
10516 size = integer_one_node;
10517 }
10518 /* As an extension we allow zero-sized arrays. */
10519 else if (integer_zerop (size))
10520 {
10521 if (!(complain & tf_error))
10522 /* We must fail if performing argument deduction (as
10523 indicated by the state of complain), so that
10524 another substitution can be found. */
10525 return error_mark_node;
10526 else if (name)
10527 pedwarn (loc, OPT_Wpedantic,
10528 "ISO C++ forbids zero-size array %qD", name);
10529 else
10530 pedwarn (loc, OPT_Wpedantic,
10531 "ISO C++ forbids zero-size array");
10532 }
10533 }
10534 else if (TREE_CONSTANT (size)
10535 /* We don't allow VLAs at non-function scopes, or during
10536 tentative template substitution. */
10537 || !at_function_scope_p ()
10538 || !(complain & tf_error))
10539 {
10540 if (!(complain & tf_error))
10541 return error_mark_node;
10542 /* `(int) &fn' is not a valid array bound. */
10543 if (name)
10544 error_at (loc,
10545 "size of array %qD is not an integral constant-expression",
10546 name);
10547 else
10548 error_at (loc, "size of array is not an integral constant-expression");
10549 size = integer_one_node;
10550 }
10551 else if (pedantic && warn_vla != 0)
10552 {
10553 if (name)
10554 pedwarn (name_loc, OPT_Wvla,
10555 "ISO C++ forbids variable length array %qD", name);
10556 else
10557 pedwarn (input_location, OPT_Wvla,
10558 "ISO C++ forbids variable length array");
10559 }
10560 else if (warn_vla > 0)
10561 {
10562 if (name)
10563 warning_at (name_loc, OPT_Wvla,
10564 "variable length array %qD is used", name);
10565 else
10566 warning (OPT_Wvla,
10567 "variable length array is used");
10568 }
10569
10570 if (processing_template_decl && !TREE_CONSTANT (size))
10571 /* A variable sized array. */
10572 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
10573 else
10574 {
10575 /* Compute the index of the largest element in the array. It is
10576 one less than the number of elements in the array. We save
10577 and restore PROCESSING_TEMPLATE_DECL so that computations in
10578 cp_build_binary_op will be appropriately folded. */
10579 {
10580 processing_template_decl_sentinel s;
10581 itype = cp_build_binary_op (input_location,
10582 MINUS_EXPR,
10583 cp_convert (ssizetype, size, complain),
10584 cp_convert (ssizetype, integer_one_node,
10585 complain),
10586 complain);
10587 itype = maybe_constant_value (itype);
10588 }
10589
10590 if (!TREE_CONSTANT (itype))
10591 {
10592 /* A variable sized array. */
10593 itype = variable_size (itype);
10594
10595 stabilize_vla_size (itype);
10596
10597 if (sanitize_flags_p (SANITIZE_VLA)
10598 && current_function_decl != NULL_TREE)
10599 {
10600 /* We have to add 1 -- in the ubsan routine we generate
10601 LE_EXPR rather than LT_EXPR. */
10602 tree t = fold_build2 (PLUS_EXPR, TREE_TYPE (itype), itype,
10603 build_one_cst (TREE_TYPE (itype)));
10604 t = ubsan_instrument_vla (input_location, t);
10605 finish_expr_stmt (t);
10606 }
10607 }
10608 /* Make sure that there was no overflow when creating to a signed
10609 index type. (For example, on a 32-bit machine, an array with
10610 size 2^32 - 1 is too big.) */
10611 else if (TREE_CODE (itype) == INTEGER_CST
10612 && TREE_OVERFLOW (itype))
10613 {
10614 if (!(complain & tf_error))
10615 return error_mark_node;
10616 error ("overflow in array dimension");
10617 TREE_OVERFLOW (itype) = 0;
10618 }
10619 }
10620
10621 /* Create and return the appropriate index type. */
10622 itype = build_index_type (itype);
10623
10624 /* If the index type were dependent, we would have returned early, so
10625 remember that it isn't. */
10626 TYPE_DEPENDENT_P (itype) = 0;
10627 TYPE_DEPENDENT_P_VALID (itype) = 1;
10628 return itype;
10629 }
10630
10631 tree
compute_array_index_type(tree name,tree size,tsubst_flags_t complain)10632 compute_array_index_type (tree name, tree size, tsubst_flags_t complain)
10633 {
10634 return compute_array_index_type_loc (input_location, name, size, complain);
10635 }
10636
10637 /* Returns the scope (if any) in which the entity declared by
10638 DECLARATOR will be located. If the entity was declared with an
10639 unqualified name, NULL_TREE is returned. */
10640
10641 tree
get_scope_of_declarator(const cp_declarator * declarator)10642 get_scope_of_declarator (const cp_declarator *declarator)
10643 {
10644 while (declarator && declarator->kind != cdk_id)
10645 declarator = declarator->declarator;
10646
10647 /* If the declarator-id is a SCOPE_REF, the scope in which the
10648 declaration occurs is the first operand. */
10649 if (declarator
10650 && declarator->u.id.qualifying_scope)
10651 return declarator->u.id.qualifying_scope;
10652
10653 /* Otherwise, the declarator is not a qualified name; the entity will
10654 be declared in the current scope. */
10655 return NULL_TREE;
10656 }
10657
10658 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
10659 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
10660 with this type. */
10661
10662 static tree
create_array_type_for_decl(tree name,tree type,tree size,location_t loc)10663 create_array_type_for_decl (tree name, tree type, tree size, location_t loc)
10664 {
10665 tree itype = NULL_TREE;
10666
10667 /* If things have already gone awry, bail now. */
10668 if (type == error_mark_node || size == error_mark_node)
10669 return error_mark_node;
10670
10671 /* 8.3.4/1: If the type of the identifier of D contains the auto
10672 type-specifier, the program is ill-formed. */
10673 if (type_uses_auto (type))
10674 {
10675 if (name)
10676 error_at (loc, "%qD declared as array of %qT", name, type);
10677 else
10678 error ("creating array of %qT", type);
10679 return error_mark_node;
10680 }
10681
10682 /* If there are some types which cannot be array elements,
10683 issue an error-message and return. */
10684 switch (TREE_CODE (type))
10685 {
10686 case VOID_TYPE:
10687 if (name)
10688 error_at (loc, "declaration of %qD as array of void", name);
10689 else
10690 error ("creating array of void");
10691 return error_mark_node;
10692
10693 case FUNCTION_TYPE:
10694 if (name)
10695 error_at (loc, "declaration of %qD as array of functions", name);
10696 else
10697 error ("creating array of functions");
10698 return error_mark_node;
10699
10700 case REFERENCE_TYPE:
10701 if (name)
10702 error_at (loc, "declaration of %qD as array of references", name);
10703 else
10704 error ("creating array of references");
10705 return error_mark_node;
10706
10707 case METHOD_TYPE:
10708 if (name)
10709 error_at (loc, "declaration of %qD as array of function members",
10710 name);
10711 else
10712 error ("creating array of function members");
10713 return error_mark_node;
10714
10715 default:
10716 break;
10717 }
10718
10719 if (!verify_type_context (name ? loc : input_location,
10720 TCTX_ARRAY_ELEMENT, type))
10721 return error_mark_node;
10722
10723 /* [dcl.array]
10724
10725 The constant expressions that specify the bounds of the arrays
10726 can be omitted only for the first member of the sequence. */
10727 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
10728 {
10729 if (name)
10730 error_at (loc, "declaration of %qD as multidimensional array must "
10731 "have bounds for all dimensions except the first",
10732 name);
10733 else
10734 error ("multidimensional array must have bounds for all "
10735 "dimensions except the first");
10736
10737 return error_mark_node;
10738 }
10739
10740 /* Figure out the index type for the array. */
10741 if (size)
10742 itype = compute_array_index_type_loc (loc, name, size,
10743 tf_warning_or_error);
10744
10745 /* [dcl.array]
10746 T is called the array element type; this type shall not be [...] an
10747 abstract class type. */
10748 abstract_virtuals_error (name, type);
10749
10750 return build_cplus_array_type (type, itype);
10751 }
10752
10753 /* Returns the smallest location that is not UNKNOWN_LOCATION. */
10754
10755 static location_t
min_location(location_t loca,location_t locb)10756 min_location (location_t loca, location_t locb)
10757 {
10758 if (loca == UNKNOWN_LOCATION
10759 || (locb != UNKNOWN_LOCATION
10760 && linemap_location_before_p (line_table, locb, loca)))
10761 return locb;
10762 return loca;
10763 }
10764
10765 /* Returns the smallest location != UNKNOWN_LOCATION among the
10766 three stored in LOCATIONS[ds_const], LOCATIONS[ds_volatile],
10767 and LOCATIONS[ds_restrict]. */
10768
10769 static location_t
smallest_type_quals_location(int type_quals,const location_t * locations)10770 smallest_type_quals_location (int type_quals, const location_t* locations)
10771 {
10772 location_t loc = UNKNOWN_LOCATION;
10773
10774 if (type_quals & TYPE_QUAL_CONST)
10775 loc = locations[ds_const];
10776
10777 if (type_quals & TYPE_QUAL_VOLATILE)
10778 loc = min_location (loc, locations[ds_volatile]);
10779
10780 if (type_quals & TYPE_QUAL_RESTRICT)
10781 loc = min_location (loc, locations[ds_restrict]);
10782
10783 return loc;
10784 }
10785
10786 /* Returns the smallest among the latter and locations[ds_type_spec]. */
10787
10788 static location_t
smallest_type_location(int type_quals,const location_t * locations)10789 smallest_type_location (int type_quals, const location_t* locations)
10790 {
10791 location_t loc = smallest_type_quals_location (type_quals, locations);
10792 return min_location (loc, locations[ds_type_spec]);
10793 }
10794
10795 static location_t
smallest_type_location(const cp_decl_specifier_seq * declspecs)10796 smallest_type_location (const cp_decl_specifier_seq *declspecs)
10797 {
10798 int type_quals = get_type_quals (declspecs);
10799 return smallest_type_location (type_quals, declspecs->locations);
10800 }
10801
10802 /* Check that it's OK to declare a function with the indicated TYPE
10803 and TYPE_QUALS. SFK indicates the kind of special function (if any)
10804 that this function is. OPTYPE is the type given in a conversion
10805 operator declaration, or the class type for a constructor/destructor.
10806 Returns the actual return type of the function; that may be different
10807 than TYPE if an error occurs, or for certain special functions. */
10808
10809 static tree
check_special_function_return_type(special_function_kind sfk,tree type,tree optype,int type_quals,const location_t * locations)10810 check_special_function_return_type (special_function_kind sfk,
10811 tree type,
10812 tree optype,
10813 int type_quals,
10814 const location_t* locations)
10815 {
10816 switch (sfk)
10817 {
10818 case sfk_constructor:
10819 if (type)
10820 error_at (smallest_type_location (type_quals, locations),
10821 "return type specification for constructor invalid");
10822 else if (type_quals != TYPE_UNQUALIFIED)
10823 error_at (smallest_type_quals_location (type_quals, locations),
10824 "qualifiers are not allowed on constructor declaration");
10825
10826 if (targetm.cxx.cdtor_returns_this ())
10827 type = build_pointer_type (optype);
10828 else
10829 type = void_type_node;
10830 break;
10831
10832 case sfk_destructor:
10833 if (type)
10834 error_at (smallest_type_location (type_quals, locations),
10835 "return type specification for destructor invalid");
10836 else if (type_quals != TYPE_UNQUALIFIED)
10837 error_at (smallest_type_quals_location (type_quals, locations),
10838 "qualifiers are not allowed on destructor declaration");
10839
10840 /* We can't use the proper return type here because we run into
10841 problems with ambiguous bases and covariant returns. */
10842 if (targetm.cxx.cdtor_returns_this ())
10843 type = build_pointer_type (void_type_node);
10844 else
10845 type = void_type_node;
10846 break;
10847
10848 case sfk_conversion:
10849 if (type)
10850 error_at (smallest_type_location (type_quals, locations),
10851 "return type specified for %<operator %T%>", optype);
10852 else if (type_quals != TYPE_UNQUALIFIED)
10853 error_at (smallest_type_quals_location (type_quals, locations),
10854 "qualifiers are not allowed on declaration of "
10855 "%<operator %T%>", optype);
10856
10857 type = optype;
10858 break;
10859
10860 case sfk_deduction_guide:
10861 if (type)
10862 error_at (smallest_type_location (type_quals, locations),
10863 "return type specified for deduction guide");
10864 else if (type_quals != TYPE_UNQUALIFIED)
10865 error_at (smallest_type_quals_location (type_quals, locations),
10866 "qualifiers are not allowed on declaration of "
10867 "deduction guide");
10868 if (TREE_CODE (optype) == TEMPLATE_TEMPLATE_PARM)
10869 {
10870 error ("template template parameter %qT in declaration of "
10871 "deduction guide", optype);
10872 type = error_mark_node;
10873 }
10874 else
10875 type = make_template_placeholder (CLASSTYPE_TI_TEMPLATE (optype));
10876 for (int i = 0; i < ds_last; ++i)
10877 if (i != ds_explicit && locations[i])
10878 error_at (locations[i],
10879 "%<decl-specifier%> in declaration of deduction guide");
10880 break;
10881
10882 default:
10883 gcc_unreachable ();
10884 }
10885
10886 return type;
10887 }
10888
10889 /* A variable or data member (whose unqualified name is IDENTIFIER)
10890 has been declared with the indicated TYPE. If the TYPE is not
10891 acceptable, issue an error message and return a type to use for
10892 error-recovery purposes. */
10893
10894 tree
check_var_type(tree identifier,tree type,location_t loc)10895 check_var_type (tree identifier, tree type, location_t loc)
10896 {
10897 if (VOID_TYPE_P (type))
10898 {
10899 if (!identifier)
10900 error_at (loc, "unnamed variable or field declared void");
10901 else if (identifier_p (identifier))
10902 {
10903 gcc_assert (!IDENTIFIER_ANY_OP_P (identifier));
10904 error_at (loc, "variable or field %qE declared void",
10905 identifier);
10906 }
10907 else
10908 error_at (loc, "variable or field declared void");
10909 type = error_mark_node;
10910 }
10911
10912 return type;
10913 }
10914
10915 /* Handle declaring DECL as an inline variable. */
10916
10917 static void
mark_inline_variable(tree decl,location_t loc)10918 mark_inline_variable (tree decl, location_t loc)
10919 {
10920 bool inlinep = true;
10921 if (! toplevel_bindings_p ())
10922 {
10923 error_at (loc, "%<inline%> specifier invalid for variable "
10924 "%qD declared at block scope", decl);
10925 inlinep = false;
10926 }
10927 else if (cxx_dialect < cxx17)
10928 pedwarn (loc, 0, "inline variables are only available "
10929 "with %<-std=c++17%> or %<-std=gnu++17%>");
10930 if (inlinep)
10931 {
10932 retrofit_lang_decl (decl);
10933 SET_DECL_VAR_DECLARED_INLINE_P (decl);
10934 }
10935 }
10936
10937
10938 /* Assign a typedef-given name to a class or enumeration type declared
10939 as anonymous at first. This was split out of grokdeclarator
10940 because it is also used in libcc1. */
10941
10942 void
name_unnamed_type(tree type,tree decl)10943 name_unnamed_type (tree type, tree decl)
10944 {
10945 gcc_assert (TYPE_UNNAMED_P (type));
10946
10947 /* Replace the anonymous name with the real name everywhere. */
10948 for (tree t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
10949 if (IDENTIFIER_ANON_P (TYPE_IDENTIFIER (t)))
10950 /* We do not rename the debug info representing the unnamed
10951 tagged type because the standard says in [dcl.typedef] that
10952 the naming applies only for linkage purposes. */
10953 /*debug_hooks->set_name (t, decl);*/
10954 TYPE_NAME (t) = decl;
10955
10956 /* If this is a typedef within a template class, the nested
10957 type is a (non-primary) template. The name for the
10958 template needs updating as well. */
10959 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
10960 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
10961 = TYPE_IDENTIFIER (type);
10962
10963 /* Adjust linkage now that we aren't unnamed anymore. */
10964 reset_type_linkage (type);
10965
10966 /* FIXME remangle member functions; member functions of a
10967 type with external linkage have external linkage. */
10968
10969 /* Check that our job is done, and that it would fail if we
10970 attempted to do it again. */
10971 gcc_assert (!TYPE_UNNAMED_P (type));
10972 }
10973
10974 /* Given declspecs and a declarator (abstract or otherwise), determine
10975 the name and type of the object declared and construct a DECL node
10976 for it.
10977
10978 DECLSPECS points to the representation of declaration-specifier
10979 sequence that precedes declarator.
10980
10981 DECL_CONTEXT says which syntactic context this declaration is in:
10982 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
10983 FUNCDEF for a function definition. Like NORMAL but a few different
10984 error messages in each case. Return value may be zero meaning
10985 this definition is too screwy to try to parse.
10986 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
10987 handle member functions (which have FIELD context).
10988 Return value may be zero meaning this definition is too screwy to
10989 try to parse.
10990 PARM for a parameter declaration (either within a function prototype
10991 or before a function body). Make a PARM_DECL, or return void_type_node.
10992 TPARM for a template parameter declaration.
10993 CATCHPARM for a parameter declaration before a catch clause.
10994 TYPENAME if for a typename (in a cast or sizeof).
10995 Don't make a DECL node; just return the ..._TYPE node.
10996 FIELD for a struct or union field; make a FIELD_DECL.
10997 BITFIELD for a field with specified width.
10998
10999 INITIALIZED is as for start_decl.
11000
11001 ATTRLIST is a pointer to the list of attributes, which may be NULL
11002 if there are none; *ATTRLIST may be modified if attributes from inside
11003 the declarator should be applied to the declaration.
11004
11005 When this function is called, scoping variables (such as
11006 CURRENT_CLASS_TYPE) should reflect the scope in which the
11007 declaration occurs, not the scope in which the new declaration will
11008 be placed. For example, on:
11009
11010 void S::f() { ... }
11011
11012 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
11013 should not be `S'.
11014
11015 Returns a DECL (if a declarator is present), a TYPE (if there is no
11016 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
11017 error occurs. */
11018
11019 tree
grokdeclarator(const cp_declarator * declarator,cp_decl_specifier_seq * declspecs,enum decl_context decl_context,int initialized,tree * attrlist)11020 grokdeclarator (const cp_declarator *declarator,
11021 cp_decl_specifier_seq *declspecs,
11022 enum decl_context decl_context,
11023 int initialized,
11024 tree* attrlist)
11025 {
11026 tree type = NULL_TREE;
11027 int longlong = 0;
11028 int explicit_intN = 0;
11029 int int_n_alt = 0;
11030 int virtualp, explicitp, friendp, inlinep, staticp;
11031 int explicit_int = 0;
11032 int explicit_char = 0;
11033 int defaulted_int = 0;
11034
11035 tree typedef_decl = NULL_TREE;
11036 const char *name = NULL;
11037 tree typedef_type = NULL_TREE;
11038 /* True if this declarator is a function definition. */
11039 bool funcdef_flag = false;
11040 cp_declarator_kind innermost_code = cdk_error;
11041 int bitfield = 0;
11042 #if 0
11043 /* See the code below that used this. */
11044 tree decl_attr = NULL_TREE;
11045 #endif
11046
11047 /* Keep track of what sort of function is being processed
11048 so that we can warn about default return values, or explicit
11049 return values which do not match prescribed defaults. */
11050 special_function_kind sfk = sfk_none;
11051
11052 tree dname = NULL_TREE;
11053 tree ctor_return_type = NULL_TREE;
11054 enum overload_flags flags = NO_SPECIAL;
11055 /* cv-qualifiers that apply to the declarator, for a declaration of
11056 a member function. */
11057 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
11058 /* virt-specifiers that apply to the declarator, for a declaration of
11059 a member function. */
11060 cp_virt_specifiers virt_specifiers = VIRT_SPEC_UNSPECIFIED;
11061 /* ref-qualifier that applies to the declarator, for a declaration of
11062 a member function. */
11063 cp_ref_qualifier rqual = REF_QUAL_NONE;
11064 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
11065 int type_quals = get_type_quals (declspecs);
11066 tree raises = NULL_TREE;
11067 int template_count = 0;
11068 tree returned_attrs = NULL_TREE;
11069 tree parms = NULL_TREE;
11070 const cp_declarator *id_declarator;
11071 /* The unqualified name of the declarator; either an
11072 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
11073 tree unqualified_id;
11074 /* The class type, if any, in which this entity is located,
11075 or NULL_TREE if none. Note that this value may be different from
11076 the current class type; for example if an attempt is made to declare
11077 "A::f" inside "B", this value will be "A". */
11078 tree ctype = current_class_type;
11079 /* The NAMESPACE_DECL for the namespace in which this entity is
11080 located. If an unqualified name is used to declare the entity,
11081 this value will be NULL_TREE, even if the entity is located at
11082 namespace scope. */
11083 tree in_namespace = NULL_TREE;
11084 cp_storage_class storage_class;
11085 bool unsigned_p, signed_p, short_p, long_p, thread_p;
11086 bool type_was_error_mark_node = false;
11087 bool parameter_pack_p = declarator ? declarator->parameter_pack_p : false;
11088 bool template_type_arg = false;
11089 bool template_parm_flag = false;
11090 bool typedef_p = decl_spec_seq_has_spec_p (declspecs, ds_typedef);
11091 bool constexpr_p = decl_spec_seq_has_spec_p (declspecs, ds_constexpr);
11092 bool constinit_p = decl_spec_seq_has_spec_p (declspecs, ds_constinit);
11093 bool consteval_p = decl_spec_seq_has_spec_p (declspecs, ds_consteval);
11094 bool late_return_type_p = false;
11095 bool array_parameter_p = false;
11096 tree reqs = NULL_TREE;
11097
11098 signed_p = decl_spec_seq_has_spec_p (declspecs, ds_signed);
11099 unsigned_p = decl_spec_seq_has_spec_p (declspecs, ds_unsigned);
11100 short_p = decl_spec_seq_has_spec_p (declspecs, ds_short);
11101 long_p = decl_spec_seq_has_spec_p (declspecs, ds_long);
11102 longlong = decl_spec_seq_has_spec_p (declspecs, ds_long_long);
11103 explicit_intN = declspecs->explicit_intN_p;
11104 int_n_alt = declspecs->int_n_alt;
11105 thread_p = decl_spec_seq_has_spec_p (declspecs, ds_thread);
11106
11107 // Was concept_p specified? Note that ds_concept
11108 // implies ds_constexpr!
11109 bool concept_p = decl_spec_seq_has_spec_p (declspecs, ds_concept);
11110 if (concept_p)
11111 constexpr_p = true;
11112
11113 if (decl_context == FUNCDEF)
11114 funcdef_flag = true, decl_context = NORMAL;
11115 else if (decl_context == MEMFUNCDEF)
11116 funcdef_flag = true, decl_context = FIELD;
11117 else if (decl_context == BITFIELD)
11118 bitfield = 1, decl_context = FIELD;
11119 else if (decl_context == TEMPLATE_TYPE_ARG)
11120 template_type_arg = true, decl_context = TYPENAME;
11121 else if (decl_context == TPARM)
11122 template_parm_flag = true, decl_context = PARM;
11123
11124 if (initialized > 1)
11125 funcdef_flag = true;
11126
11127 location_t typespec_loc = smallest_type_location (type_quals,
11128 declspecs->locations);
11129 if (typespec_loc == UNKNOWN_LOCATION)
11130 typespec_loc = input_location;
11131
11132 location_t id_loc = declarator ? declarator->id_loc : input_location;
11133 if (id_loc == UNKNOWN_LOCATION)
11134 id_loc = input_location;
11135
11136 /* Look inside a declarator for the name being declared
11137 and get it as a string, for an error message. */
11138 for (id_declarator = declarator;
11139 id_declarator;
11140 id_declarator = id_declarator->declarator)
11141 {
11142 if (id_declarator->kind != cdk_id)
11143 innermost_code = id_declarator->kind;
11144
11145 switch (id_declarator->kind)
11146 {
11147 case cdk_function:
11148 if (id_declarator->declarator
11149 && id_declarator->declarator->kind == cdk_id)
11150 {
11151 sfk = id_declarator->declarator->u.id.sfk;
11152 if (sfk == sfk_destructor)
11153 flags = DTOR_FLAG;
11154 }
11155 break;
11156
11157 case cdk_id:
11158 {
11159 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
11160 tree decl = id_declarator->u.id.unqualified_name;
11161 if (!decl)
11162 break;
11163 if (qualifying_scope)
11164 {
11165 if (check_for_bare_parameter_packs (qualifying_scope,
11166 id_declarator->id_loc))
11167 return error_mark_node;
11168 if (at_function_scope_p ())
11169 {
11170 /* [dcl.meaning]
11171
11172 A declarator-id shall not be qualified except
11173 for ...
11174
11175 None of the cases are permitted in block
11176 scope. */
11177 if (qualifying_scope == global_namespace)
11178 error ("invalid use of qualified-name %<::%D%>",
11179 decl);
11180 else if (TYPE_P (qualifying_scope))
11181 error ("invalid use of qualified-name %<%T::%D%>",
11182 qualifying_scope, decl);
11183 else
11184 error ("invalid use of qualified-name %<%D::%D%>",
11185 qualifying_scope, decl);
11186 return error_mark_node;
11187 }
11188 else if (TYPE_P (qualifying_scope))
11189 {
11190 ctype = qualifying_scope;
11191 if (!MAYBE_CLASS_TYPE_P (ctype))
11192 {
11193 error_at (id_declarator->id_loc,
11194 "%q#T is not a class or namespace", ctype);
11195 ctype = NULL_TREE;
11196 }
11197 else if (innermost_code != cdk_function
11198 && current_class_type
11199 && !uniquely_derived_from_p (ctype,
11200 current_class_type))
11201 {
11202 error_at (id_declarator->id_loc,
11203 "invalid use of qualified-name %<%T::%D%>",
11204 qualifying_scope, decl);
11205 return error_mark_node;
11206 }
11207 }
11208 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
11209 in_namespace = qualifying_scope;
11210 }
11211 switch (TREE_CODE (decl))
11212 {
11213 case BIT_NOT_EXPR:
11214 {
11215 if (innermost_code != cdk_function)
11216 {
11217 error_at (EXPR_LOCATION (decl),
11218 "declaration of %qE as non-function", decl);
11219 return error_mark_node;
11220 }
11221 else if (!qualifying_scope
11222 && !(current_class_type && at_class_scope_p ()))
11223 {
11224 error_at (EXPR_LOCATION (decl),
11225 "declaration of %qE as non-member", decl);
11226 return error_mark_node;
11227 }
11228
11229 tree type = TREE_OPERAND (decl, 0);
11230 if (TYPE_P (type))
11231 type = constructor_name (type);
11232 name = identifier_to_locale (IDENTIFIER_POINTER (type));
11233 dname = decl;
11234 }
11235 break;
11236
11237 case TEMPLATE_ID_EXPR:
11238 {
11239 tree fns = TREE_OPERAND (decl, 0);
11240
11241 dname = fns;
11242 if (!identifier_p (dname))
11243 dname = OVL_NAME (dname);
11244 }
11245 /* Fall through. */
11246
11247 case IDENTIFIER_NODE:
11248 if (identifier_p (decl))
11249 dname = decl;
11250
11251 if (IDENTIFIER_KEYWORD_P (dname))
11252 {
11253 error ("declarator-id missing; using reserved word %qD",
11254 dname);
11255 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
11256 }
11257 else if (!IDENTIFIER_CONV_OP_P (dname))
11258 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
11259 else
11260 {
11261 gcc_assert (flags == NO_SPECIAL);
11262 flags = TYPENAME_FLAG;
11263 sfk = sfk_conversion;
11264 tree glob = get_global_binding (dname);
11265 if (glob && TREE_CODE (glob) == TYPE_DECL)
11266 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
11267 else
11268 name = "<invalid operator>";
11269 }
11270 break;
11271
11272 default:
11273 gcc_unreachable ();
11274 }
11275 break;
11276 }
11277
11278 case cdk_array:
11279 case cdk_pointer:
11280 case cdk_reference:
11281 case cdk_ptrmem:
11282 break;
11283
11284 case cdk_decomp:
11285 name = "structured binding";
11286 break;
11287
11288 case cdk_error:
11289 return error_mark_node;
11290
11291 default:
11292 gcc_unreachable ();
11293 }
11294 if (id_declarator->kind == cdk_id)
11295 break;
11296 }
11297
11298 /* [dcl.fct.edf]
11299
11300 The declarator in a function-definition shall have the form
11301 D1 ( parameter-declaration-clause) ... */
11302 if (funcdef_flag && innermost_code != cdk_function)
11303 {
11304 error_at (id_loc, "function definition does not declare parameters");
11305 return error_mark_node;
11306 }
11307
11308 if (flags == TYPENAME_FLAG
11309 && innermost_code != cdk_function
11310 && ! (ctype && !declspecs->any_specifiers_p))
11311 {
11312 error_at (id_loc, "declaration of %qD as non-function", dname);
11313 return error_mark_node;
11314 }
11315
11316 if (dname && identifier_p (dname))
11317 {
11318 if (UDLIT_OPER_P (dname)
11319 && innermost_code != cdk_function)
11320 {
11321 error_at (id_loc, "declaration of %qD as non-function", dname);
11322 return error_mark_node;
11323 }
11324
11325 if (IDENTIFIER_ANY_OP_P (dname))
11326 {
11327 if (typedef_p)
11328 {
11329 error_at (id_loc, "declaration of %qD as %<typedef%>", dname);
11330 return error_mark_node;
11331 }
11332 else if (decl_context == PARM || decl_context == CATCHPARM)
11333 {
11334 error_at (id_loc, "declaration of %qD as parameter", dname);
11335 return error_mark_node;
11336 }
11337 }
11338 }
11339
11340 /* Anything declared one level down from the top level
11341 must be one of the parameters of a function
11342 (because the body is at least two levels down). */
11343
11344 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
11345 by not allowing C++ class definitions to specify their parameters
11346 with xdecls (must be spec.d in the parmlist).
11347
11348 Since we now wait to push a class scope until we are sure that
11349 we are in a legitimate method context, we must set oldcname
11350 explicitly (since current_class_name is not yet alive).
11351
11352 We also want to avoid calling this a PARM if it is in a namespace. */
11353
11354 if (decl_context == NORMAL && !toplevel_bindings_p ())
11355 {
11356 cp_binding_level *b = current_binding_level;
11357 current_binding_level = b->level_chain;
11358 if (current_binding_level != 0 && toplevel_bindings_p ())
11359 decl_context = PARM;
11360 current_binding_level = b;
11361 }
11362
11363 if (name == NULL)
11364 name = decl_context == PARM ? "parameter" : "type name";
11365
11366 if (consteval_p && constexpr_p)
11367 {
11368 error_at (declspecs->locations[ds_consteval],
11369 "both %qs and %qs specified", "constexpr", "consteval");
11370 return error_mark_node;
11371 }
11372
11373 if (concept_p && typedef_p)
11374 {
11375 error_at (declspecs->locations[ds_concept],
11376 "%qs cannot appear in a typedef declaration", "concept");
11377 return error_mark_node;
11378 }
11379
11380 if (constexpr_p && typedef_p)
11381 {
11382 error_at (declspecs->locations[ds_constexpr],
11383 "%qs cannot appear in a typedef declaration", "constexpr");
11384 return error_mark_node;
11385 }
11386
11387 if (consteval_p && typedef_p)
11388 {
11389 error_at (declspecs->locations[ds_consteval],
11390 "%qs cannot appear in a typedef declaration", "consteval");
11391 return error_mark_node;
11392 }
11393
11394 if (constinit_p && typedef_p)
11395 {
11396 error_at (declspecs->locations[ds_constinit],
11397 "%qs cannot appear in a typedef declaration", "constinit");
11398 return error_mark_node;
11399 }
11400
11401 /* [dcl.spec]/2 "At most one of the constexpr, consteval, and constinit
11402 keywords shall appear in a decl-specifier-seq." */
11403 if (constinit_p && constexpr_p)
11404 {
11405 gcc_rich_location richloc (declspecs->locations[ds_constinit]);
11406 richloc.add_range (declspecs->locations[ds_constexpr]);
11407 error_at (&richloc,
11408 "can use at most one of the %<constinit%> and %<constexpr%> "
11409 "specifiers");
11410 return error_mark_node;
11411 }
11412
11413 /* If there were multiple types specified in the decl-specifier-seq,
11414 issue an error message. */
11415 if (declspecs->multiple_types_p)
11416 {
11417 error_at (typespec_loc,
11418 "two or more data types in declaration of %qs", name);
11419 return error_mark_node;
11420 }
11421
11422 if (declspecs->conflicting_specifiers_p)
11423 {
11424 error_at (min_location (declspecs->locations[ds_typedef],
11425 declspecs->locations[ds_storage_class]),
11426 "conflicting specifiers in declaration of %qs", name);
11427 return error_mark_node;
11428 }
11429
11430 /* Extract the basic type from the decl-specifier-seq. */
11431 type = declspecs->type;
11432 if (type == error_mark_node)
11433 {
11434 type = NULL_TREE;
11435 type_was_error_mark_node = true;
11436 }
11437 cp_warn_deprecated_use (type);
11438 if (type && TREE_CODE (type) == TYPE_DECL)
11439 {
11440 cp_warn_deprecated_use_scopes (CP_DECL_CONTEXT (type));
11441 typedef_decl = type;
11442 type = TREE_TYPE (typedef_decl);
11443 if (DECL_ARTIFICIAL (typedef_decl))
11444 cp_warn_deprecated_use (type);
11445 }
11446 /* No type at all: default to `int', and set DEFAULTED_INT
11447 because it was not a user-defined typedef. */
11448 if (type == NULL_TREE)
11449 {
11450 if (signed_p || unsigned_p || long_p || short_p)
11451 {
11452 /* These imply 'int'. */
11453 type = integer_type_node;
11454 defaulted_int = 1;
11455 }
11456 /* If we just have "complex", it is equivalent to "complex double". */
11457 else if (!longlong && !explicit_intN
11458 && decl_spec_seq_has_spec_p (declspecs, ds_complex))
11459 {
11460 type = double_type_node;
11461 pedwarn (declspecs->locations[ds_complex], OPT_Wpedantic,
11462 "ISO C++ does not support plain %<complex%> meaning "
11463 "%<double complex%>");
11464 }
11465 }
11466 /* Gather flags. */
11467 explicit_int = declspecs->explicit_int_p;
11468 explicit_char = declspecs->explicit_char_p;
11469
11470 #if 0
11471 /* See the code below that used this. */
11472 if (typedef_decl)
11473 decl_attr = DECL_ATTRIBUTES (typedef_decl);
11474 #endif
11475 typedef_type = type;
11476
11477 if (sfk == sfk_conversion || sfk == sfk_deduction_guide)
11478 ctor_return_type = TREE_TYPE (dname);
11479 else
11480 ctor_return_type = ctype;
11481
11482 if (sfk != sfk_none)
11483 {
11484 type = check_special_function_return_type (sfk, type,
11485 ctor_return_type,
11486 type_quals,
11487 declspecs->locations);
11488 type_quals = TYPE_UNQUALIFIED;
11489 }
11490 else if (type == NULL_TREE)
11491 {
11492 int is_main;
11493
11494 explicit_int = -1;
11495
11496 /* We handle `main' specially here, because 'main () { }' is so
11497 common. With no options, it is allowed. With -Wreturn-type,
11498 it is a warning. It is only an error with -pedantic-errors. */
11499 is_main = (funcdef_flag
11500 && dname && identifier_p (dname)
11501 && MAIN_NAME_P (dname)
11502 && ctype == NULL_TREE
11503 && in_namespace == NULL_TREE
11504 && current_namespace == global_namespace);
11505
11506 if (type_was_error_mark_node)
11507 /* We've already issued an error, don't complain more. */;
11508 else if (in_system_header_at (id_loc) || flag_ms_extensions)
11509 /* Allow it, sigh. */;
11510 else if (! is_main)
11511 permerror (id_loc, "ISO C++ forbids declaration of %qs with no type",
11512 name);
11513 else if (pedantic)
11514 pedwarn (id_loc, OPT_Wpedantic,
11515 "ISO C++ forbids declaration of %qs with no type", name);
11516 else
11517 warning_at (id_loc, OPT_Wreturn_type,
11518 "ISO C++ forbids declaration of %qs with no type", name);
11519
11520 if (type_was_error_mark_node && template_parm_flag)
11521 /* FIXME we should be able to propagate the error_mark_node as is
11522 for other contexts too. */
11523 type = error_mark_node;
11524 else
11525 type = integer_type_node;
11526 }
11527
11528 ctype = NULL_TREE;
11529
11530 if (explicit_intN)
11531 {
11532 if (! int_n_enabled_p[declspecs->int_n_idx])
11533 {
11534 error_at (declspecs->locations[ds_type_spec],
11535 "%<__int%d%> is not supported by this target",
11536 int_n_data[declspecs->int_n_idx].bitsize);
11537 explicit_intN = false;
11538 }
11539 /* Don't pedwarn if the alternate "__intN__" form has been used instead
11540 of "__intN". */
11541 else if (!int_n_alt && pedantic)
11542 pedwarn (declspecs->locations[ds_type_spec], OPT_Wpedantic,
11543 "ISO C++ does not support %<__int%d%> for %qs",
11544 int_n_data[declspecs->int_n_idx].bitsize, name);
11545 }
11546
11547 /* Now process the modifiers that were specified
11548 and check for invalid combinations. */
11549
11550 /* Long double is a special combination. */
11551 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
11552 {
11553 long_p = false;
11554 type = cp_build_qualified_type (long_double_type_node,
11555 cp_type_quals (type));
11556 }
11557
11558 /* Check all other uses of type modifiers. */
11559
11560 if (unsigned_p || signed_p || long_p || short_p)
11561 {
11562 location_t loc;
11563 const char *key;
11564 if (unsigned_p)
11565 {
11566 key = "unsigned";
11567 loc = declspecs->locations[ds_unsigned];
11568 }
11569 else if (signed_p)
11570 {
11571 key = "signed";
11572 loc = declspecs->locations[ds_signed];
11573 }
11574 else if (longlong)
11575 {
11576 key = "long long";
11577 loc = declspecs->locations[ds_long_long];
11578 }
11579 else if (long_p)
11580 {
11581 key = "long";
11582 loc = declspecs->locations[ds_long];
11583 }
11584 else /* if (short_p) */
11585 {
11586 key = "short";
11587 loc = declspecs->locations[ds_short];
11588 }
11589
11590 int ok = 0;
11591
11592 if (signed_p && unsigned_p)
11593 {
11594 gcc_rich_location richloc (declspecs->locations[ds_signed]);
11595 richloc.add_range (declspecs->locations[ds_unsigned]);
11596 error_at (&richloc,
11597 "%<signed%> and %<unsigned%> specified together");
11598 }
11599 else if (long_p && short_p)
11600 {
11601 gcc_rich_location richloc (declspecs->locations[ds_long]);
11602 richloc.add_range (declspecs->locations[ds_short]);
11603 error_at (&richloc, "%<long%> and %<short%> specified together");
11604 }
11605 else if (TREE_CODE (type) != INTEGER_TYPE
11606 || type == char8_type_node
11607 || type == char16_type_node
11608 || type == char32_type_node
11609 || ((long_p || short_p)
11610 && (explicit_char || explicit_intN)))
11611 error_at (loc, "%qs specified with %qT", key, type);
11612 else if (!explicit_int && !defaulted_int
11613 && !explicit_char && !explicit_intN)
11614 {
11615 if (typedef_decl)
11616 {
11617 pedwarn (loc, OPT_Wpedantic, "%qs specified with %qT",
11618 key, type);
11619 ok = !flag_pedantic_errors;
11620 }
11621 else if (declspecs->decltype_p)
11622 error_at (loc, "%qs specified with %<decltype%>", key);
11623 else
11624 error_at (loc, "%qs specified with %<typeof%>", key);
11625 }
11626 else
11627 ok = 1;
11628
11629 /* Discard the type modifiers if they are invalid. */
11630 if (! ok)
11631 {
11632 unsigned_p = false;
11633 signed_p = false;
11634 long_p = false;
11635 short_p = false;
11636 longlong = 0;
11637 }
11638 }
11639
11640 /* Decide whether an integer type is signed or not.
11641 Optionally treat bitfields as signed by default. */
11642 if (unsigned_p
11643 /* [class.bit]
11644
11645 It is implementation-defined whether a plain (neither
11646 explicitly signed or unsigned) char, short, int, or long
11647 bit-field is signed or unsigned.
11648
11649 Naturally, we extend this to long long as well. Note that
11650 this does not include wchar_t. */
11651 || (bitfield && !flag_signed_bitfields
11652 && !signed_p
11653 /* A typedef for plain `int' without `signed' can be
11654 controlled just like plain `int', but a typedef for
11655 `signed int' cannot be so controlled. */
11656 && !(typedef_decl
11657 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
11658 && TREE_CODE (type) == INTEGER_TYPE
11659 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
11660 {
11661 if (explicit_intN)
11662 type = int_n_trees[declspecs->int_n_idx].unsigned_type;
11663 else if (longlong)
11664 type = long_long_unsigned_type_node;
11665 else if (long_p)
11666 type = long_unsigned_type_node;
11667 else if (short_p)
11668 type = short_unsigned_type_node;
11669 else if (type == char_type_node)
11670 type = unsigned_char_type_node;
11671 else if (typedef_decl)
11672 type = unsigned_type_for (type);
11673 else
11674 type = unsigned_type_node;
11675 }
11676 else if (signed_p && type == char_type_node)
11677 type = signed_char_type_node;
11678 else if (explicit_intN)
11679 type = int_n_trees[declspecs->int_n_idx].signed_type;
11680 else if (longlong)
11681 type = long_long_integer_type_node;
11682 else if (long_p)
11683 type = long_integer_type_node;
11684 else if (short_p)
11685 type = short_integer_type_node;
11686
11687 if (decl_spec_seq_has_spec_p (declspecs, ds_complex))
11688 {
11689 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
11690 error_at (declspecs->locations[ds_complex],
11691 "complex invalid for %qs", name);
11692 /* If a modifier is specified, the resulting complex is the complex
11693 form of TYPE. E.g, "complex short" is "complex short int". */
11694 else if (type == integer_type_node)
11695 type = complex_integer_type_node;
11696 else if (type == float_type_node)
11697 type = complex_float_type_node;
11698 else if (type == double_type_node)
11699 type = complex_double_type_node;
11700 else if (type == long_double_type_node)
11701 type = complex_long_double_type_node;
11702 else
11703 type = build_complex_type (type);
11704 }
11705
11706 /* If we're using the injected-class-name to form a compound type or a
11707 declaration, replace it with the underlying class so we don't get
11708 redundant typedefs in the debug output. But if we are returning the
11709 type unchanged, leave it alone so that it's available to
11710 maybe_get_template_decl_from_type_decl. */
11711 if (CLASS_TYPE_P (type)
11712 && DECL_SELF_REFERENCE_P (TYPE_NAME (type))
11713 && type == TREE_TYPE (TYPE_NAME (type))
11714 && (declarator || type_quals))
11715 type = DECL_ORIGINAL_TYPE (TYPE_NAME (type));
11716
11717 type_quals |= cp_type_quals (type);
11718 type = cp_build_qualified_type_real
11719 (type, type_quals, ((((typedef_decl && !DECL_ARTIFICIAL (typedef_decl))
11720 || declspecs->decltype_p)
11721 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
11722 /* We might have ignored or rejected some of the qualifiers. */
11723 type_quals = cp_type_quals (type);
11724
11725 if (cxx_dialect >= cxx17 && type && is_auto (type)
11726 && innermost_code != cdk_function
11727 && id_declarator && declarator != id_declarator)
11728 if (tree tmpl = CLASS_PLACEHOLDER_TEMPLATE (type))
11729 {
11730 error_at (typespec_loc, "template placeholder type %qT must be followed "
11731 "by a simple declarator-id", type);
11732 inform (DECL_SOURCE_LOCATION (tmpl), "%qD declared here", tmpl);
11733 type = error_mark_node;
11734 }
11735
11736 staticp = 0;
11737 inlinep = decl_spec_seq_has_spec_p (declspecs, ds_inline);
11738 virtualp = decl_spec_seq_has_spec_p (declspecs, ds_virtual);
11739 explicitp = decl_spec_seq_has_spec_p (declspecs, ds_explicit);
11740
11741 storage_class = declspecs->storage_class;
11742 if (storage_class == sc_static)
11743 staticp = 1 + (decl_context == FIELD);
11744
11745 if (virtualp)
11746 {
11747 if (staticp == 2)
11748 {
11749 gcc_rich_location richloc (declspecs->locations[ds_virtual]);
11750 richloc.add_range (declspecs->locations[ds_storage_class]);
11751 error_at (&richloc, "member %qD cannot be declared both %<virtual%> "
11752 "and %<static%>", dname);
11753 storage_class = sc_none;
11754 staticp = 0;
11755 }
11756 if (constexpr_p && cxx_dialect < cxx2a)
11757 {
11758 gcc_rich_location richloc (declspecs->locations[ds_virtual]);
11759 richloc.add_range (declspecs->locations[ds_constexpr]);
11760 pedwarn (&richloc, OPT_Wpedantic, "member %qD can be declared both "
11761 "%<virtual%> and %<constexpr%> only in %<-std=c++2a%> or "
11762 "%<-std=gnu++2a%>", dname);
11763 }
11764 }
11765 friendp = decl_spec_seq_has_spec_p (declspecs, ds_friend);
11766
11767 /* Issue errors about use of storage classes for parameters. */
11768 if (decl_context == PARM)
11769 {
11770 if (typedef_p)
11771 {
11772 error_at (declspecs->locations[ds_typedef],
11773 "typedef declaration invalid in parameter declaration");
11774 return error_mark_node;
11775 }
11776 else if (template_parm_flag && storage_class != sc_none)
11777 {
11778 error_at (min_location (declspecs->locations[ds_thread],
11779 declspecs->locations[ds_storage_class]),
11780 "storage class specified for template parameter %qs",
11781 name);
11782 return error_mark_node;
11783 }
11784 else if (storage_class == sc_static
11785 || storage_class == sc_extern
11786 || thread_p)
11787 {
11788 error_at (min_location (declspecs->locations[ds_thread],
11789 declspecs->locations[ds_storage_class]),
11790 "storage class specified for parameter %qs", name);
11791 return error_mark_node;
11792 }
11793
11794 /* Function parameters cannot be concept. */
11795 if (concept_p)
11796 {
11797 error_at (declspecs->locations[ds_concept],
11798 "a parameter cannot be declared %qs", "concept");
11799 concept_p = 0;
11800 constexpr_p = 0;
11801 }
11802 /* Function parameters cannot be constexpr. If we saw one, moan
11803 and pretend it wasn't there. */
11804 else if (constexpr_p)
11805 {
11806 error_at (declspecs->locations[ds_constexpr],
11807 "a parameter cannot be declared %qs", "constexpr");
11808 constexpr_p = 0;
11809 }
11810 if (constinit_p)
11811 {
11812 error_at (declspecs->locations[ds_constinit],
11813 "a parameter cannot be declared %qs", "constinit");
11814 constinit_p = 0;
11815 }
11816 if (consteval_p)
11817 {
11818 error_at (declspecs->locations[ds_consteval],
11819 "a parameter cannot be declared %qs", "consteval");
11820 consteval_p = 0;
11821 }
11822 }
11823
11824 /* Give error if `virtual' is used outside of class declaration. */
11825 if (virtualp
11826 && (current_class_name == NULL_TREE || decl_context != FIELD))
11827 {
11828 error_at (declspecs->locations[ds_virtual],
11829 "%<virtual%> outside class declaration");
11830 virtualp = 0;
11831 }
11832
11833 if (innermost_code == cdk_decomp)
11834 {
11835 location_t loc = (declarator->kind == cdk_reference
11836 ? declarator->declarator->id_loc : declarator->id_loc);
11837 if (inlinep)
11838 error_at (declspecs->locations[ds_inline],
11839 "structured binding declaration cannot be %qs", "inline");
11840 if (typedef_p)
11841 error_at (declspecs->locations[ds_typedef],
11842 "structured binding declaration cannot be %qs", "typedef");
11843 if (constexpr_p && !concept_p)
11844 error_at (declspecs->locations[ds_constexpr], "structured "
11845 "binding declaration cannot be %qs", "constexpr");
11846 if (consteval_p)
11847 error_at (declspecs->locations[ds_consteval], "structured "
11848 "binding declaration cannot be %qs", "consteval");
11849 if (thread_p && cxx_dialect < cxx2a)
11850 pedwarn (declspecs->locations[ds_thread], 0,
11851 "structured binding declaration can be %qs only in "
11852 "%<-std=c++2a%> or %<-std=gnu++2a%>",
11853 declspecs->gnu_thread_keyword_p
11854 ? "__thread" : "thread_local");
11855 if (concept_p)
11856 error_at (declspecs->locations[ds_concept],
11857 "structured binding declaration cannot be %qs", "concept");
11858 /* [dcl.struct.bind] "A cv that includes volatile is deprecated." */
11859 if (type_quals & TYPE_QUAL_VOLATILE)
11860 warning_at (declspecs->locations[ds_volatile], OPT_Wvolatile,
11861 "%<volatile%>-qualified structured binding is deprecated");
11862 switch (storage_class)
11863 {
11864 case sc_none:
11865 break;
11866 case sc_register:
11867 error_at (loc, "structured binding declaration cannot be %qs",
11868 "register");
11869 break;
11870 case sc_static:
11871 if (cxx_dialect < cxx2a)
11872 pedwarn (loc, 0,
11873 "structured binding declaration can be %qs only in "
11874 "%<-std=c++2a%> or %<-std=gnu++2a%>", "static");
11875 break;
11876 case sc_extern:
11877 error_at (loc, "structured binding declaration cannot be %qs",
11878 "extern");
11879 break;
11880 case sc_mutable:
11881 error_at (loc, "structured binding declaration cannot be %qs",
11882 "mutable");
11883 break;
11884 case sc_auto:
11885 error_at (loc, "structured binding declaration cannot be "
11886 "C++98 %<auto%>");
11887 break;
11888 default:
11889 gcc_unreachable ();
11890 }
11891 if (TREE_CODE (type) != TEMPLATE_TYPE_PARM
11892 || TYPE_IDENTIFIER (type) != auto_identifier)
11893 {
11894 if (type != error_mark_node)
11895 {
11896 error_at (loc, "structured binding declaration cannot have "
11897 "type %qT", type);
11898 inform (loc,
11899 "type must be cv-qualified %<auto%> or reference to "
11900 "cv-qualified %<auto%>");
11901 }
11902 type = build_qualified_type (make_auto (), type_quals);
11903 declspecs->type = type;
11904 }
11905 inlinep = 0;
11906 typedef_p = 0;
11907 constexpr_p = 0;
11908 consteval_p = 0;
11909 concept_p = 0;
11910 if (storage_class != sc_static)
11911 {
11912 storage_class = sc_none;
11913 declspecs->storage_class = sc_none;
11914 }
11915 }
11916
11917 /* Static anonymous unions are dealt with here. */
11918 if (staticp && decl_context == TYPENAME
11919 && declspecs->type
11920 && ANON_AGGR_TYPE_P (declspecs->type))
11921 decl_context = FIELD;
11922
11923 /* Warn about storage classes that are invalid for certain
11924 kinds of declarations (parameters, typenames, etc.). */
11925 if (thread_p
11926 && ((storage_class
11927 && storage_class != sc_extern
11928 && storage_class != sc_static)
11929 || typedef_p))
11930 {
11931 location_t loc
11932 = min_location (declspecs->locations[ds_thread],
11933 declspecs->locations[ds_storage_class]);
11934 error_at (loc, "multiple storage classes in declaration of %qs", name);
11935 thread_p = false;
11936 }
11937 if (decl_context != NORMAL
11938 && ((storage_class != sc_none
11939 && storage_class != sc_mutable)
11940 || thread_p))
11941 {
11942 if ((decl_context == PARM || decl_context == CATCHPARM)
11943 && (storage_class == sc_register
11944 || storage_class == sc_auto))
11945 ;
11946 else if (typedef_p)
11947 ;
11948 else if (decl_context == FIELD
11949 /* C++ allows static class elements. */
11950 && storage_class == sc_static)
11951 /* C++ also allows inlines and signed and unsigned elements,
11952 but in those cases we don't come in here. */
11953 ;
11954 else
11955 {
11956 location_t loc
11957 = min_location (declspecs->locations[ds_thread],
11958 declspecs->locations[ds_storage_class]);
11959 if (decl_context == FIELD)
11960 error_at (loc, "storage class specified for %qs", name);
11961 else if (decl_context == PARM || decl_context == CATCHPARM)
11962 error_at (loc, "storage class specified for parameter %qs", name);
11963 else
11964 error_at (loc, "storage class specified for typename");
11965 if (storage_class == sc_register
11966 || storage_class == sc_auto
11967 || storage_class == sc_extern
11968 || thread_p)
11969 storage_class = sc_none;
11970 }
11971 }
11972 else if (storage_class == sc_extern && funcdef_flag
11973 && ! toplevel_bindings_p ())
11974 error ("nested function %qs declared %<extern%>", name);
11975 else if (toplevel_bindings_p ())
11976 {
11977 if (storage_class == sc_auto)
11978 error_at (declspecs->locations[ds_storage_class],
11979 "top-level declaration of %qs specifies %<auto%>", name);
11980 }
11981 else if (thread_p
11982 && storage_class != sc_extern
11983 && storage_class != sc_static)
11984 {
11985 if (declspecs->gnu_thread_keyword_p)
11986 pedwarn (declspecs->locations[ds_thread],
11987 0, "function-scope %qs implicitly auto and "
11988 "declared %<__thread%>", name);
11989
11990 /* When thread_local is applied to a variable of block scope the
11991 storage-class-specifier static is implied if it does not appear
11992 explicitly. */
11993 storage_class = declspecs->storage_class = sc_static;
11994 staticp = 1;
11995 }
11996
11997 if (storage_class && friendp)
11998 {
11999 error_at (min_location (declspecs->locations[ds_thread],
12000 declspecs->locations[ds_storage_class]),
12001 "storage class specifiers invalid in friend function "
12002 "declarations");
12003 storage_class = sc_none;
12004 staticp = 0;
12005 }
12006
12007 if (!id_declarator)
12008 unqualified_id = NULL_TREE;
12009 else
12010 {
12011 unqualified_id = id_declarator->u.id.unqualified_name;
12012 switch (TREE_CODE (unqualified_id))
12013 {
12014 case BIT_NOT_EXPR:
12015 unqualified_id = TREE_OPERAND (unqualified_id, 0);
12016 if (TYPE_P (unqualified_id))
12017 unqualified_id = constructor_name (unqualified_id);
12018 break;
12019
12020 case IDENTIFIER_NODE:
12021 case TEMPLATE_ID_EXPR:
12022 break;
12023
12024 default:
12025 gcc_unreachable ();
12026 }
12027 }
12028
12029 if (declspecs->std_attributes)
12030 {
12031 location_t attr_loc = declspecs->locations[ds_std_attribute];
12032 if (warning_at (attr_loc, OPT_Wattributes, "attribute ignored"))
12033 inform (attr_loc, "an attribute that appertains to a type-specifier "
12034 "is ignored");
12035 }
12036
12037 /* Determine the type of the entity declared by recurring on the
12038 declarator. */
12039 for (; declarator; declarator = declarator->declarator)
12040 {
12041 const cp_declarator *inner_declarator;
12042 tree attrs;
12043
12044 if (type == error_mark_node)
12045 return error_mark_node;
12046
12047 attrs = declarator->attributes;
12048 if (attrs)
12049 {
12050 int attr_flags;
12051
12052 attr_flags = 0;
12053 if (declarator == NULL || declarator->kind == cdk_id)
12054 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
12055 if (declarator->kind == cdk_function)
12056 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
12057 if (declarator->kind == cdk_array)
12058 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
12059 tree late_attrs = NULL_TREE;
12060 if (decl_context != PARM && decl_context != TYPENAME)
12061 /* Assume that any attributes that get applied late to
12062 templates will DTRT when applied to the declaration
12063 as a whole. */
12064 late_attrs = splice_template_attributes (&attrs, type);
12065 returned_attrs = decl_attributes (&type,
12066 chainon (returned_attrs, attrs),
12067 attr_flags);
12068 returned_attrs = chainon (late_attrs, returned_attrs);
12069 }
12070
12071 inner_declarator = declarator->declarator;
12072
12073 /* We don't want to warn in parameter context because we don't
12074 yet know if the parse will succeed, and this might turn out
12075 to be a constructor call. */
12076 if (decl_context != PARM
12077 && decl_context != TYPENAME
12078 && !typedef_p
12079 && declarator->parenthesized != UNKNOWN_LOCATION
12080 /* If the type is class-like and the inner name used a
12081 global namespace qualifier, we need the parens.
12082 Unfortunately all we can tell is whether a qualified name
12083 was used or not. */
12084 && !(inner_declarator
12085 && inner_declarator->kind == cdk_id
12086 && inner_declarator->u.id.qualifying_scope
12087 && (MAYBE_CLASS_TYPE_P (type)
12088 || TREE_CODE (type) == ENUMERAL_TYPE)))
12089 warning_at (declarator->parenthesized, OPT_Wparentheses,
12090 "unnecessary parentheses in declaration of %qs", name);
12091 if (declarator->kind == cdk_id || declarator->kind == cdk_decomp)
12092 break;
12093
12094 switch (declarator->kind)
12095 {
12096 case cdk_array:
12097 type = create_array_type_for_decl (dname, type,
12098 declarator->u.array.bounds,
12099 declarator->id_loc);
12100 if (!valid_array_size_p (dname
12101 ? declarator->id_loc : input_location,
12102 type, dname))
12103 type = error_mark_node;
12104
12105 if (declarator->std_attributes)
12106 /* [dcl.array]/1:
12107
12108 The optional attribute-specifier-seq appertains to the
12109 array. */
12110 returned_attrs = chainon (returned_attrs,
12111 declarator->std_attributes);
12112 break;
12113
12114 case cdk_function:
12115 {
12116 tree arg_types;
12117 int funcdecl_p;
12118
12119 /* Declaring a function type. */
12120
12121 {
12122 iloc_sentinel ils (declspecs->locations[ds_type_spec]);
12123 abstract_virtuals_error (ACU_RETURN, type);
12124 }
12125
12126 /* Pick up type qualifiers which should be applied to `this'. */
12127 memfn_quals = declarator->u.function.qualifiers;
12128 /* Pick up virt-specifiers. */
12129 virt_specifiers = declarator->u.function.virt_specifiers;
12130 /* And ref-qualifier, too */
12131 rqual = declarator->u.function.ref_qualifier;
12132 /* And tx-qualifier. */
12133 tree tx_qual = declarator->u.function.tx_qualifier;
12134 /* Pick up the exception specifications. */
12135 raises = declarator->u.function.exception_specification;
12136 /* If the exception-specification is ill-formed, let's pretend
12137 there wasn't one. */
12138 if (raises == error_mark_node)
12139 raises = NULL_TREE;
12140
12141 if (reqs)
12142 error_at (location_of (reqs), "requires-clause on return type");
12143 reqs = declarator->u.function.requires_clause;
12144
12145 /* Say it's a definition only for the CALL_EXPR
12146 closest to the identifier. */
12147 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
12148
12149 /* Handle a late-specified return type. */
12150 tree late_return_type = declarator->u.function.late_return_type;
12151 if (funcdecl_p
12152 /* This is the case e.g. for
12153 using T = auto () -> int. */
12154 || inner_declarator == NULL)
12155 {
12156 if (tree auto_node = type_uses_auto (type))
12157 {
12158 if (!late_return_type)
12159 {
12160 if (current_class_type
12161 && LAMBDA_TYPE_P (current_class_type))
12162 /* OK for C++11 lambdas. */;
12163 else if (cxx_dialect < cxx14)
12164 {
12165 error_at (typespec_loc, "%qs function uses "
12166 "%<auto%> type specifier without "
12167 "trailing return type", name);
12168 inform (typespec_loc,
12169 "deduced return type only available "
12170 "with %<-std=c++14%> or %<-std=gnu++14%>");
12171 }
12172 else if (virtualp)
12173 {
12174 error_at (typespec_loc, "virtual function "
12175 "cannot have deduced return type");
12176 virtualp = false;
12177 }
12178 }
12179 else if (!is_auto (type) && sfk != sfk_conversion)
12180 {
12181 error_at (typespec_loc, "%qs function with trailing "
12182 "return type has %qT as its type rather "
12183 "than plain %<auto%>", name, type);
12184 return error_mark_node;
12185 }
12186 else if (is_auto (type) && AUTO_IS_DECLTYPE (type))
12187 {
12188 if (funcdecl_p)
12189 error_at (typespec_loc,
12190 "%qs function with trailing return type "
12191 "has %<decltype(auto)%> as its type "
12192 "rather than plain %<auto%>", name);
12193 else
12194 error_at (typespec_loc,
12195 "invalid use of %<decltype(auto)%>");
12196 return error_mark_node;
12197 }
12198 tree tmpl = CLASS_PLACEHOLDER_TEMPLATE (auto_node);
12199 if (!tmpl)
12200 if (tree late_auto = type_uses_auto (late_return_type))
12201 tmpl = CLASS_PLACEHOLDER_TEMPLATE (late_auto);
12202 if (tmpl && funcdecl_p)
12203 {
12204 if (!dguide_name_p (unqualified_id))
12205 {
12206 error_at (declarator->id_loc, "deduced class "
12207 "type %qD in function return type",
12208 DECL_NAME (tmpl));
12209 inform (DECL_SOURCE_LOCATION (tmpl),
12210 "%qD declared here", tmpl);
12211 return error_mark_node;
12212 }
12213 else if (!late_return_type)
12214 {
12215 error_at (declarator->id_loc, "deduction guide "
12216 "for %qT must have trailing return "
12217 "type", TREE_TYPE (tmpl));
12218 inform (DECL_SOURCE_LOCATION (tmpl),
12219 "%qD declared here", tmpl);
12220 return error_mark_node;
12221 }
12222 else if (CLASS_TYPE_P (late_return_type)
12223 && CLASSTYPE_TEMPLATE_INFO (late_return_type)
12224 && (CLASSTYPE_TI_TEMPLATE (late_return_type)
12225 == tmpl))
12226 /* OK */;
12227 else
12228 error ("trailing return type %qT of deduction guide "
12229 "is not a specialization of %qT",
12230 late_return_type, TREE_TYPE (tmpl));
12231 }
12232 }
12233 else if (late_return_type
12234 && sfk != sfk_conversion)
12235 {
12236 if (late_return_type == error_mark_node)
12237 return error_mark_node;
12238 if (cxx_dialect < cxx11)
12239 /* Not using maybe_warn_cpp0x because this should
12240 always be an error. */
12241 error_at (typespec_loc,
12242 "trailing return type only available "
12243 "with %<-std=c++11%> or %<-std=gnu++11%>");
12244 else
12245 error_at (typespec_loc, "%qs function with trailing "
12246 "return type not declared with %<auto%> "
12247 "type specifier", name);
12248 return error_mark_node;
12249 }
12250 }
12251 type = splice_late_return_type (type, late_return_type);
12252 if (type == error_mark_node)
12253 return error_mark_node;
12254
12255 if (late_return_type)
12256 {
12257 late_return_type_p = true;
12258 type_quals = cp_type_quals (type);
12259 }
12260
12261 if (type_quals != TYPE_UNQUALIFIED)
12262 {
12263 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
12264 warning_at (typespec_loc, OPT_Wignored_qualifiers, "type "
12265 "qualifiers ignored on function return type");
12266 /* [dcl.fct] "A volatile-qualified return type is
12267 deprecated." */
12268 if (type_quals & TYPE_QUAL_VOLATILE)
12269 warning_at (typespec_loc, OPT_Wvolatile,
12270 "%<volatile%>-qualified return type is "
12271 "deprecated");
12272
12273 /* We now know that the TYPE_QUALS don't apply to the
12274 decl, but to its return type. */
12275 type_quals = TYPE_UNQUALIFIED;
12276 }
12277
12278 /* Error about some types functions can't return. */
12279
12280 if (TREE_CODE (type) == FUNCTION_TYPE)
12281 {
12282 error_at (typespec_loc, "%qs declared as function returning "
12283 "a function", name);
12284 return error_mark_node;
12285 }
12286 if (TREE_CODE (type) == ARRAY_TYPE)
12287 {
12288 error_at (typespec_loc, "%qs declared as function returning "
12289 "an array", name);
12290 return error_mark_node;
12291 }
12292 if (constinit_p && funcdecl_p)
12293 {
12294 error_at (declspecs->locations[ds_constinit],
12295 "%<constinit%> on function return type is not "
12296 "allowed");
12297 return error_mark_node;
12298 }
12299 /* Only plain decltype(auto) is allowed. */
12300 if (tree a = type_uses_auto (type))
12301 {
12302 if (AUTO_IS_DECLTYPE (a) && a != type)
12303 {
12304 error_at (typespec_loc, "%qT as type rather than "
12305 "plain %<decltype(auto)%>", type);
12306 return error_mark_node;
12307 }
12308 }
12309
12310 if (ctype == NULL_TREE
12311 && decl_context == FIELD
12312 && funcdecl_p
12313 && friendp == 0)
12314 ctype = current_class_type;
12315
12316 if (ctype && (sfk == sfk_constructor
12317 || sfk == sfk_destructor))
12318 {
12319 /* We are within a class's scope. If our declarator name
12320 is the same as the class name, and we are defining
12321 a function, then it is a constructor/destructor, and
12322 therefore returns a void type. */
12323
12324 /* ISO C++ 12.4/2. A destructor may not be declared
12325 const or volatile. A destructor may not be static.
12326 A destructor may not be declared with ref-qualifier.
12327
12328 ISO C++ 12.1. A constructor may not be declared
12329 const or volatile. A constructor may not be
12330 virtual. A constructor may not be static.
12331 A constructor may not be declared with ref-qualifier. */
12332 if (staticp == 2)
12333 error_at (declspecs->locations[ds_storage_class],
12334 (flags == DTOR_FLAG)
12335 ? G_("destructor cannot be static member "
12336 "function")
12337 : G_("constructor cannot be static member "
12338 "function"));
12339 if (memfn_quals)
12340 {
12341 error ((flags == DTOR_FLAG)
12342 ? G_("destructors may not be cv-qualified")
12343 : G_("constructors may not be cv-qualified"));
12344 memfn_quals = TYPE_UNQUALIFIED;
12345 }
12346
12347 if (rqual)
12348 {
12349 maybe_warn_cpp0x (CPP0X_REF_QUALIFIER);
12350 error ((flags == DTOR_FLAG)
12351 ? G_("destructors may not be ref-qualified")
12352 : G_("constructors may not be ref-qualified"));
12353 rqual = REF_QUAL_NONE;
12354 }
12355
12356 if (decl_context == FIELD
12357 && !member_function_or_else (ctype,
12358 current_class_type,
12359 flags))
12360 return error_mark_node;
12361
12362 if (flags != DTOR_FLAG)
12363 {
12364 /* It's a constructor. */
12365 if (explicitp == 1)
12366 explicitp = 2;
12367 if (virtualp)
12368 {
12369 permerror (declspecs->locations[ds_virtual],
12370 "constructors cannot be declared %<virtual%>");
12371 virtualp = 0;
12372 }
12373 if (decl_context == FIELD
12374 && sfk != sfk_constructor)
12375 return error_mark_node;
12376 }
12377 if (decl_context == FIELD)
12378 staticp = 0;
12379 }
12380 else if (friendp)
12381 {
12382 if (virtualp)
12383 {
12384 /* Cannot be both friend and virtual. */
12385 gcc_rich_location richloc (declspecs->locations[ds_virtual]);
12386 richloc.add_range (declspecs->locations[ds_friend]);
12387 error_at (&richloc, "virtual functions cannot be friends");
12388 friendp = 0;
12389 }
12390 if (decl_context == NORMAL)
12391 error_at (declarator->id_loc,
12392 "friend declaration not in class definition");
12393 if (current_function_decl && funcdef_flag)
12394 {
12395 error_at (declarator->id_loc,
12396 "cannot define friend function %qs in a local "
12397 "class definition", name);
12398 friendp = 0;
12399 }
12400 /* [class.friend]/6: A function can be defined in a friend
12401 declaration if the function name is unqualified. */
12402 if (funcdef_flag && in_namespace)
12403 {
12404 if (in_namespace == global_namespace)
12405 error_at (declarator->id_loc,
12406 "friend function definition %qs cannot have "
12407 "a name qualified with %<::%>", name);
12408 else
12409 error_at (declarator->id_loc,
12410 "friend function definition %qs cannot have "
12411 "a name qualified with %<%D::%>", name,
12412 in_namespace);
12413 }
12414 }
12415 else if (ctype && sfk == sfk_conversion)
12416 {
12417 if (explicitp == 1)
12418 {
12419 maybe_warn_cpp0x (CPP0X_EXPLICIT_CONVERSION);
12420 explicitp = 2;
12421 }
12422 if (late_return_type_p)
12423 error ("a conversion function cannot have a trailing return type");
12424 }
12425 else if (sfk == sfk_deduction_guide)
12426 {
12427 if (explicitp == 1)
12428 explicitp = 2;
12429 }
12430
12431 tree pushed_scope = NULL_TREE;
12432 if (funcdecl_p
12433 && decl_context != FIELD
12434 && inner_declarator->u.id.qualifying_scope
12435 && CLASS_TYPE_P (inner_declarator->u.id.qualifying_scope))
12436 pushed_scope
12437 = push_scope (inner_declarator->u.id.qualifying_scope);
12438
12439 arg_types = grokparms (declarator->u.function.parameters, &parms);
12440
12441 if (pushed_scope)
12442 pop_scope (pushed_scope);
12443
12444 if (inner_declarator
12445 && inner_declarator->kind == cdk_id
12446 && inner_declarator->u.id.sfk == sfk_destructor
12447 && arg_types != void_list_node)
12448 {
12449 error_at (declarator->id_loc,
12450 "destructors may not have parameters");
12451 arg_types = void_list_node;
12452 parms = NULL_TREE;
12453 }
12454
12455 type = build_function_type (type, arg_types);
12456
12457 tree attrs = declarator->std_attributes;
12458 if (tx_qual)
12459 {
12460 tree att = build_tree_list (tx_qual, NULL_TREE);
12461 /* transaction_safe applies to the type, but
12462 transaction_safe_dynamic applies to the function. */
12463 if (is_attribute_p ("transaction_safe", tx_qual))
12464 attrs = chainon (attrs, att);
12465 else
12466 returned_attrs = chainon (returned_attrs, att);
12467 }
12468 if (attrs)
12469 /* [dcl.fct]/2:
12470
12471 The optional attribute-specifier-seq appertains to
12472 the function type. */
12473 cplus_decl_attributes (&type, attrs, 0);
12474
12475 if (raises)
12476 type = build_exception_variant (type, raises);
12477 }
12478 break;
12479
12480 case cdk_pointer:
12481 case cdk_reference:
12482 case cdk_ptrmem:
12483 /* Filter out pointers-to-references and references-to-references.
12484 We can get these if a TYPE_DECL is used. */
12485
12486 if (TYPE_REF_P (type))
12487 {
12488 if (declarator->kind != cdk_reference)
12489 {
12490 error ("cannot declare pointer to %q#T", type);
12491 type = TREE_TYPE (type);
12492 }
12493
12494 /* In C++0x, we allow reference to reference declarations
12495 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
12496 and template type arguments [14.3.1/4 temp.arg.type]. The
12497 check for direct reference to reference declarations, which
12498 are still forbidden, occurs below. Reasoning behind the change
12499 can be found in DR106, DR540, and the rvalue reference
12500 proposals. */
12501 else if (cxx_dialect == cxx98)
12502 {
12503 error ("cannot declare reference to %q#T", type);
12504 type = TREE_TYPE (type);
12505 }
12506 }
12507 else if (VOID_TYPE_P (type))
12508 {
12509 if (declarator->kind == cdk_reference)
12510 error ("cannot declare reference to %q#T", type);
12511 else if (declarator->kind == cdk_ptrmem)
12512 error ("cannot declare pointer to %q#T member", type);
12513 }
12514
12515 /* We now know that the TYPE_QUALS don't apply to the decl,
12516 but to the target of the pointer. */
12517 type_quals = TYPE_UNQUALIFIED;
12518
12519 /* This code used to handle METHOD_TYPE, but I don't think it's
12520 possible to get it here anymore. */
12521 gcc_assert (TREE_CODE (type) != METHOD_TYPE);
12522 if (declarator->kind == cdk_ptrmem
12523 && TREE_CODE (type) == FUNCTION_TYPE)
12524 {
12525 memfn_quals |= type_memfn_quals (type);
12526 type = build_memfn_type (type,
12527 declarator->u.pointer.class_type,
12528 memfn_quals,
12529 rqual);
12530 if (type == error_mark_node)
12531 return error_mark_node;
12532
12533 rqual = REF_QUAL_NONE;
12534 memfn_quals = TYPE_UNQUALIFIED;
12535 }
12536
12537 if (TREE_CODE (type) == FUNCTION_TYPE
12538 && (type_memfn_quals (type) != TYPE_UNQUALIFIED
12539 || type_memfn_rqual (type) != REF_QUAL_NONE))
12540 error (declarator->kind == cdk_reference
12541 ? G_("cannot declare reference to qualified function type %qT")
12542 : G_("cannot declare pointer to qualified function type %qT"),
12543 type);
12544
12545 /* When the pointed-to type involves components of variable size,
12546 care must be taken to ensure that the size evaluation code is
12547 emitted early enough to dominate all the possible later uses
12548 and late enough for the variables on which it depends to have
12549 been assigned.
12550
12551 This is expected to happen automatically when the pointed-to
12552 type has a name/declaration of it's own, but special attention
12553 is required if the type is anonymous.
12554
12555 We handle the NORMAL and FIELD contexts here by inserting a
12556 dummy statement that just evaluates the size at a safe point
12557 and ensures it is not deferred until e.g. within a deeper
12558 conditional context (c++/43555).
12559
12560 We expect nothing to be needed here for PARM or TYPENAME.
12561 Evaluating the size at this point for TYPENAME would
12562 actually be incorrect, as we might be in the middle of an
12563 expression with side effects on the pointed-to type size
12564 "arguments" prior to the pointer declaration point and the
12565 size evaluation could end up prior to the side effects. */
12566
12567 if (!TYPE_NAME (type)
12568 && (decl_context == NORMAL || decl_context == FIELD)
12569 && at_function_scope_p ()
12570 && variably_modified_type_p (type, NULL_TREE))
12571 {
12572 TYPE_NAME (type) = build_decl (UNKNOWN_LOCATION, TYPE_DECL,
12573 NULL_TREE, type);
12574 add_decl_expr (TYPE_NAME (type));
12575 }
12576
12577 if (declarator->kind == cdk_reference)
12578 {
12579 /* In C++0x, the type we are creating a reference to might be
12580 a typedef which is itself a reference type. In that case,
12581 we follow the reference collapsing rules in
12582 [7.1.3/8 dcl.typedef] to create the final reference type:
12583
12584 "If a typedef TD names a type that is a reference to a type
12585 T, an attempt to create the type 'lvalue reference to cv TD'
12586 creates the type 'lvalue reference to T,' while an attempt
12587 to create the type "rvalue reference to cv TD' creates the
12588 type TD."
12589 */
12590 if (VOID_TYPE_P (type))
12591 /* We already gave an error. */;
12592 else if (TYPE_REF_P (type))
12593 {
12594 if (declarator->u.reference.rvalue_ref)
12595 /* Leave type alone. */;
12596 else
12597 type = cp_build_reference_type (TREE_TYPE (type), false);
12598 }
12599 else
12600 type = cp_build_reference_type
12601 (type, declarator->u.reference.rvalue_ref);
12602
12603 /* In C++0x, we need this check for direct reference to
12604 reference declarations, which are forbidden by
12605 [8.3.2/5 dcl.ref]. Reference to reference declarations
12606 are only allowed indirectly through typedefs and template
12607 type arguments. Example:
12608
12609 void foo(int & &); // invalid ref-to-ref decl
12610
12611 typedef int & int_ref;
12612 void foo(int_ref &); // valid ref-to-ref decl
12613 */
12614 if (inner_declarator && inner_declarator->kind == cdk_reference)
12615 error ("cannot declare reference to %q#T, which is not "
12616 "a typedef or a template type argument", type);
12617 }
12618 else if (TREE_CODE (type) == METHOD_TYPE)
12619 type = build_ptrmemfunc_type (build_pointer_type (type));
12620 else if (declarator->kind == cdk_ptrmem)
12621 {
12622 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
12623 != NAMESPACE_DECL);
12624 if (declarator->u.pointer.class_type == error_mark_node)
12625 /* We will already have complained. */
12626 type = error_mark_node;
12627 else
12628 type = build_ptrmem_type (declarator->u.pointer.class_type,
12629 type);
12630 }
12631 else
12632 type = build_pointer_type (type);
12633
12634 /* Process a list of type modifier keywords (such as
12635 const or volatile) that were given inside the `*' or `&'. */
12636
12637 if (declarator->u.pointer.qualifiers)
12638 {
12639 type
12640 = cp_build_qualified_type (type,
12641 declarator->u.pointer.qualifiers);
12642 type_quals = cp_type_quals (type);
12643 }
12644
12645 /* Apply C++11 attributes to the pointer, and not to the
12646 type pointed to. This is unlike what is done for GNU
12647 attributes above. It is to comply with [dcl.ptr]/1:
12648
12649 [the optional attribute-specifier-seq (7.6.1) appertains
12650 to the pointer and not to the object pointed to]. */
12651 if (declarator->std_attributes)
12652 decl_attributes (&type, declarator->std_attributes,
12653 0);
12654
12655 ctype = NULL_TREE;
12656 break;
12657
12658 case cdk_error:
12659 break;
12660
12661 default:
12662 gcc_unreachable ();
12663 }
12664 }
12665
12666 id_loc = declarator ? declarator->id_loc : input_location;
12667
12668 /* A `constexpr' specifier used in an object declaration declares
12669 the object as `const'. */
12670 if (constexpr_p && innermost_code != cdk_function)
12671 {
12672 /* DR1688 says that a `constexpr' specifier in combination with
12673 `volatile' is valid. */
12674
12675 if (!TYPE_REF_P (type))
12676 {
12677 type_quals |= TYPE_QUAL_CONST;
12678 type = cp_build_qualified_type (type, type_quals);
12679 }
12680 }
12681
12682 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
12683 && !FUNC_OR_METHOD_TYPE_P (type)
12684 && !variable_template_p (TREE_OPERAND (unqualified_id, 0)))
12685 {
12686 error ("template-id %qD used as a declarator",
12687 unqualified_id);
12688 unqualified_id = dname;
12689 }
12690
12691 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
12692 qualified with a class-name, turn it into a METHOD_TYPE, unless
12693 we know that the function is static. We take advantage of this
12694 opportunity to do other processing that pertains to entities
12695 explicitly declared to be class members. Note that if DECLARATOR
12696 is non-NULL, we know it is a cdk_id declarator; otherwise, we
12697 would not have exited the loop above. */
12698 if (declarator
12699 && declarator->kind == cdk_id
12700 && declarator->u.id.qualifying_scope
12701 && MAYBE_CLASS_TYPE_P (declarator->u.id.qualifying_scope))
12702 {
12703 ctype = declarator->u.id.qualifying_scope;
12704 ctype = TYPE_MAIN_VARIANT (ctype);
12705 template_count = num_template_headers_for_class (ctype);
12706
12707 if (ctype == current_class_type)
12708 {
12709 if (friendp)
12710 {
12711 permerror (declspecs->locations[ds_friend],
12712 "member functions are implicitly "
12713 "friends of their class");
12714 friendp = 0;
12715 }
12716 else
12717 permerror (id_loc, "extra qualification %<%T::%> on member %qs",
12718 ctype, name);
12719 }
12720 else if (/* If the qualifying type is already complete, then we
12721 can skip the following checks. */
12722 !COMPLETE_TYPE_P (ctype)
12723 && (/* If the function is being defined, then
12724 qualifying type must certainly be complete. */
12725 funcdef_flag
12726 /* A friend declaration of "T::f" is OK, even if
12727 "T" is a template parameter. But, if this
12728 function is not a friend, the qualifying type
12729 must be a class. */
12730 || (!friendp && !CLASS_TYPE_P (ctype))
12731 /* For a declaration, the type need not be
12732 complete, if either it is dependent (since there
12733 is no meaningful definition of complete in that
12734 case) or the qualifying class is currently being
12735 defined. */
12736 || !(dependent_type_p (ctype)
12737 || currently_open_class (ctype)))
12738 /* Check that the qualifying type is complete. */
12739 && !complete_type_or_else (ctype, NULL_TREE))
12740 return error_mark_node;
12741 else if (TREE_CODE (type) == FUNCTION_TYPE)
12742 {
12743 if (current_class_type
12744 && (!friendp || funcdef_flag || initialized))
12745 {
12746 error_at (id_loc, funcdef_flag || initialized
12747 ? G_("cannot define member function %<%T::%s%> "
12748 "within %qT")
12749 : G_("cannot declare member function %<%T::%s%> "
12750 "within %qT"),
12751 ctype, name, current_class_type);
12752 return error_mark_node;
12753 }
12754 }
12755 else if (typedef_p && current_class_type)
12756 {
12757 error_at (id_loc, "cannot declare member %<%T::%s%> within %qT",
12758 ctype, name, current_class_type);
12759 return error_mark_node;
12760 }
12761 }
12762
12763 if (ctype == NULL_TREE && decl_context == FIELD && friendp == 0)
12764 ctype = current_class_type;
12765
12766 /* Now TYPE has the actual type. */
12767
12768 if (returned_attrs)
12769 {
12770 if (attrlist)
12771 *attrlist = chainon (returned_attrs, *attrlist);
12772 else
12773 attrlist = &returned_attrs;
12774 }
12775
12776 if (declarator
12777 && declarator->kind == cdk_id
12778 && declarator->std_attributes
12779 && attrlist != NULL)
12780 {
12781 /* [dcl.meaning]/1: The optional attribute-specifier-seq following
12782 a declarator-id appertains to the entity that is declared. */
12783 if (declarator->std_attributes != error_mark_node)
12784 *attrlist = chainon (*attrlist, declarator->std_attributes);
12785 else
12786 /* We should have already diagnosed the issue (c++/78344). */
12787 gcc_assert (seen_error ());
12788 }
12789
12790 /* Handle parameter packs. */
12791 if (parameter_pack_p)
12792 {
12793 if (decl_context == PARM)
12794 /* Turn the type into a pack expansion.*/
12795 type = make_pack_expansion (type);
12796 else
12797 error ("non-parameter %qs cannot be a parameter pack", name);
12798 }
12799
12800 if ((decl_context == FIELD || decl_context == PARM)
12801 && !processing_template_decl
12802 && variably_modified_type_p (type, NULL_TREE))
12803 {
12804 if (decl_context == FIELD)
12805 error_at (id_loc,
12806 "data member may not have variably modified type %qT", type);
12807 else
12808 error_at (id_loc,
12809 "parameter may not have variably modified type %qT", type);
12810 type = error_mark_node;
12811 }
12812
12813 if (explicitp == 1 || (explicitp && friendp))
12814 {
12815 /* [dcl.fct.spec] (C++11) The explicit specifier shall be used only
12816 in the declaration of a constructor or conversion function within
12817 a class definition. */
12818 if (!current_class_type)
12819 error_at (declspecs->locations[ds_explicit],
12820 "%<explicit%> outside class declaration");
12821 else if (friendp)
12822 error_at (declspecs->locations[ds_explicit],
12823 "%<explicit%> in friend declaration");
12824 else
12825 error_at (declspecs->locations[ds_explicit],
12826 "only declarations of constructors and conversion operators "
12827 "can be %<explicit%>");
12828 explicitp = 0;
12829 }
12830
12831 if (storage_class == sc_mutable)
12832 {
12833 location_t sloc = declspecs->locations[ds_storage_class];
12834 if (decl_context != FIELD || friendp)
12835 {
12836 error_at (sloc, "non-member %qs cannot be declared %<mutable%>",
12837 name);
12838 storage_class = sc_none;
12839 }
12840 else if (decl_context == TYPENAME || typedef_p)
12841 {
12842 error_at (sloc,
12843 "non-object member %qs cannot be declared %<mutable%>",
12844 name);
12845 storage_class = sc_none;
12846 }
12847 else if (FUNC_OR_METHOD_TYPE_P (type))
12848 {
12849 error_at (sloc, "function %qs cannot be declared %<mutable%>",
12850 name);
12851 storage_class = sc_none;
12852 }
12853 else if (staticp)
12854 {
12855 error_at (sloc, "%<static%> %qs cannot be declared %<mutable%>",
12856 name);
12857 storage_class = sc_none;
12858 }
12859 else if (type_quals & TYPE_QUAL_CONST)
12860 {
12861 error_at (sloc, "%<const%> %qs cannot be declared %<mutable%>",
12862 name);
12863 storage_class = sc_none;
12864 }
12865 else if (TYPE_REF_P (type))
12866 {
12867 permerror (sloc, "reference %qs cannot be declared %<mutable%>",
12868 name);
12869 storage_class = sc_none;
12870 }
12871 }
12872
12873 /* If this is declaring a typedef name, return a TYPE_DECL. */
12874 if (typedef_p && decl_context != TYPENAME)
12875 {
12876 bool alias_p = decl_spec_seq_has_spec_p (declspecs, ds_alias);
12877 tree decl;
12878
12879 if (funcdef_flag)
12880 {
12881 if (decl_context == NORMAL)
12882 error_at (id_loc,
12883 "typedef may not be a function definition");
12884 else
12885 error_at (id_loc,
12886 "typedef may not be a member function definition");
12887 return error_mark_node;
12888 }
12889
12890 /* This declaration:
12891
12892 typedef void f(int) const;
12893
12894 declares a function type which is not a member of any
12895 particular class, but which is cv-qualified; for
12896 example "f S::*" declares a pointer to a const-qualified
12897 member function of S. We record the cv-qualification in the
12898 function type. */
12899 if ((rqual || memfn_quals) && TREE_CODE (type) == FUNCTION_TYPE)
12900 {
12901 type = apply_memfn_quals (type, memfn_quals, rqual);
12902
12903 /* We have now dealt with these qualifiers. */
12904 memfn_quals = TYPE_UNQUALIFIED;
12905 rqual = REF_QUAL_NONE;
12906 }
12907
12908 if (type_uses_auto (type))
12909 {
12910 if (alias_p)
12911 error_at (declspecs->locations[ds_type_spec],
12912 "%<auto%> not allowed in alias declaration");
12913 else
12914 error_at (declspecs->locations[ds_type_spec],
12915 "typedef declared %<auto%>");
12916 type = error_mark_node;
12917 }
12918
12919 if (reqs)
12920 error_at (location_of (reqs), "requires-clause on typedef");
12921
12922 if (id_declarator && declarator->u.id.qualifying_scope)
12923 {
12924 error_at (id_loc, "typedef name may not be a nested-name-specifier");
12925 type = error_mark_node;
12926 }
12927
12928 if (decl_context == FIELD)
12929 decl = build_lang_decl_loc (id_loc, TYPE_DECL, unqualified_id, type);
12930 else
12931 decl = build_decl (id_loc, TYPE_DECL, unqualified_id, type);
12932
12933 if (decl_context != FIELD)
12934 {
12935 if (!current_function_decl)
12936 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
12937 else if (DECL_MAYBE_IN_CHARGE_CDTOR_P (current_function_decl))
12938 /* The TYPE_DECL is "abstract" because there will be
12939 clones of this constructor/destructor, and there will
12940 be copies of this TYPE_DECL generated in those
12941 clones. The decloning optimization (for space) may
12942 revert this subsequently if it determines that
12943 the clones should share a common implementation. */
12944 DECL_ABSTRACT_P (decl) = true;
12945 }
12946 else if (current_class_type
12947 && constructor_name_p (unqualified_id, current_class_type))
12948 permerror (id_loc, "ISO C++ forbids nested type %qD with same name "
12949 "as enclosing class",
12950 unqualified_id);
12951
12952 /* If the user declares "typedef struct {...} foo" then the
12953 struct will have an anonymous name. Fill that name in now.
12954 Nothing can refer to it, so nothing needs know about the name
12955 change. */
12956 if (type != error_mark_node
12957 && unqualified_id
12958 && TYPE_NAME (type)
12959 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
12960 && TYPE_UNNAMED_P (type)
12961 && declspecs->type_definition_p
12962 && attributes_naming_typedef_ok (*attrlist)
12963 && cp_type_quals (type) == TYPE_UNQUALIFIED)
12964 name_unnamed_type (type, decl);
12965
12966 if (signed_p
12967 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
12968 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
12969
12970 bad_specifiers (decl, BSP_TYPE, virtualp,
12971 memfn_quals != TYPE_UNQUALIFIED,
12972 inlinep, friendp, raises != NULL_TREE,
12973 declspecs->locations);
12974
12975 if (alias_p)
12976 /* Acknowledge that this was written:
12977 `using analias = atype;'. */
12978 TYPE_DECL_ALIAS_P (decl) = 1;
12979
12980 return decl;
12981 }
12982
12983 /* Detect the case of an array type of unspecified size
12984 which came, as such, direct from a typedef name.
12985 We must copy the type, so that the array's domain can be
12986 individually set by the object's initializer. */
12987
12988 if (type && typedef_type
12989 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
12990 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
12991 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
12992
12993 /* Detect where we're using a typedef of function type to declare a
12994 function. PARMS will not be set, so we must create it now. */
12995
12996 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
12997 {
12998 tree decls = NULL_TREE;
12999 tree args;
13000
13001 for (args = TYPE_ARG_TYPES (type);
13002 args && args != void_list_node;
13003 args = TREE_CHAIN (args))
13004 {
13005 tree decl = cp_build_parm_decl (NULL_TREE, NULL_TREE,
13006 TREE_VALUE (args));
13007
13008 DECL_CHAIN (decl) = decls;
13009 decls = decl;
13010 }
13011
13012 parms = nreverse (decls);
13013
13014 if (decl_context != TYPENAME)
13015 {
13016 /* The qualifiers on the function type become the qualifiers on
13017 the non-static member function. */
13018 memfn_quals |= type_memfn_quals (type);
13019 rqual = type_memfn_rqual (type);
13020 type_quals = TYPE_UNQUALIFIED;
13021 raises = TYPE_RAISES_EXCEPTIONS (type);
13022 }
13023 }
13024
13025 /* If this is a type name (such as, in a cast or sizeof),
13026 compute the type and return it now. */
13027
13028 if (decl_context == TYPENAME)
13029 {
13030 /* Note that here we don't care about type_quals. */
13031
13032 /* Special case: "friend class foo" looks like a TYPENAME context. */
13033 if (friendp)
13034 {
13035 if (inlinep)
13036 {
13037 error ("%<inline%> specified for friend class declaration");
13038 inlinep = 0;
13039 }
13040
13041 if (!current_aggr)
13042 {
13043 /* Don't allow friend declaration without a class-key. */
13044 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
13045 permerror (input_location, "template parameters cannot be friends");
13046 else if (TREE_CODE (type) == TYPENAME_TYPE)
13047 permerror (input_location, "friend declaration requires class-key, "
13048 "i.e. %<friend class %T::%D%>",
13049 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
13050 else
13051 permerror (input_location, "friend declaration requires class-key, "
13052 "i.e. %<friend %#T%>",
13053 type);
13054 }
13055
13056 /* Only try to do this stuff if we didn't already give up. */
13057 if (type != integer_type_node)
13058 {
13059 /* A friendly class? */
13060 if (current_class_type)
13061 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
13062 /*complain=*/true);
13063 else
13064 error ("trying to make class %qT a friend of global scope",
13065 type);
13066
13067 type = void_type_node;
13068 }
13069 }
13070 else if (memfn_quals || rqual)
13071 {
13072 if (ctype == NULL_TREE
13073 && TREE_CODE (type) == METHOD_TYPE)
13074 ctype = TYPE_METHOD_BASETYPE (type);
13075
13076 if (ctype)
13077 type = build_memfn_type (type, ctype, memfn_quals, rqual);
13078 /* Core issue #547: need to allow this in template type args.
13079 Allow it in general in C++11 for alias-declarations. */
13080 else if ((template_type_arg || cxx_dialect >= cxx11)
13081 && TREE_CODE (type) == FUNCTION_TYPE)
13082 type = apply_memfn_quals (type, memfn_quals, rqual);
13083 else
13084 error ("invalid qualifiers on non-member function type");
13085 }
13086
13087 if (reqs)
13088 error_at (location_of (reqs), "requires-clause on type-id");
13089
13090 return type;
13091 }
13092 else if (unqualified_id == NULL_TREE && decl_context != PARM
13093 && decl_context != CATCHPARM
13094 && TREE_CODE (type) != UNION_TYPE
13095 && ! bitfield
13096 && innermost_code != cdk_decomp)
13097 {
13098 error ("abstract declarator %qT used as declaration", type);
13099 return error_mark_node;
13100 }
13101
13102 if (!FUNC_OR_METHOD_TYPE_P (type))
13103 {
13104 /* Only functions may be declared using an operator-function-id. */
13105 if (dname && IDENTIFIER_ANY_OP_P (dname))
13106 {
13107 error_at (id_loc, "declaration of %qD as non-function", dname);
13108 return error_mark_node;
13109 }
13110
13111 if (reqs)
13112 error_at (location_of (reqs),
13113 "requires-clause on declaration of non-function type %qT",
13114 type);
13115 }
13116
13117 /* We don't check parameter types here because we can emit a better
13118 error message later. */
13119 if (decl_context != PARM)
13120 {
13121 type = check_var_type (unqualified_id, type, id_loc);
13122 if (type == error_mark_node)
13123 return error_mark_node;
13124 }
13125
13126 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
13127 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
13128
13129 if (decl_context == PARM || decl_context == CATCHPARM)
13130 {
13131 if (ctype || in_namespace)
13132 error ("cannot use %<::%> in parameter declaration");
13133
13134 tree auto_node = type_uses_auto (type);
13135 if (auto_node && !(cxx_dialect >= cxx17 && template_parm_flag))
13136 {
13137 if (cxx_dialect >= cxx14)
13138 {
13139 if (decl_context == PARM && AUTO_IS_DECLTYPE (auto_node))
13140 error_at (typespec_loc,
13141 "cannot declare a parameter with %<decltype(auto)%>");
13142 else
13143 error_at (typespec_loc,
13144 "%<auto%> parameter not permitted in this context");
13145 }
13146 else
13147 error_at (typespec_loc, "parameter declared %<auto%>");
13148 type = error_mark_node;
13149 }
13150
13151 /* A parameter declared as an array of T is really a pointer to T.
13152 One declared as a function is really a pointer to a function.
13153 One declared as a member is really a pointer to member. */
13154
13155 if (TREE_CODE (type) == ARRAY_TYPE)
13156 {
13157 /* Transfer const-ness of array into that of type pointed to. */
13158 type = build_pointer_type (TREE_TYPE (type));
13159 type_quals = TYPE_UNQUALIFIED;
13160 array_parameter_p = true;
13161 }
13162 else if (TREE_CODE (type) == FUNCTION_TYPE)
13163 type = build_pointer_type (type);
13164 }
13165
13166 if (ctype && TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
13167 && !(unqualified_id
13168 && identifier_p (unqualified_id)
13169 && IDENTIFIER_NEWDEL_OP_P (unqualified_id)))
13170 {
13171 cp_cv_quals real_quals = memfn_quals;
13172 if (cxx_dialect < cxx14 && constexpr_p
13173 && sfk != sfk_constructor && sfk != sfk_destructor)
13174 real_quals |= TYPE_QUAL_CONST;
13175 type = build_memfn_type (type, ctype, real_quals, rqual);
13176 }
13177
13178 {
13179 tree decl = NULL_TREE;
13180
13181 if (decl_context == PARM)
13182 {
13183 decl = cp_build_parm_decl (NULL_TREE, unqualified_id, type);
13184 DECL_ARRAY_PARAMETER_P (decl) = array_parameter_p;
13185
13186 bad_specifiers (decl, BSP_PARM, virtualp,
13187 memfn_quals != TYPE_UNQUALIFIED,
13188 inlinep, friendp, raises != NULL_TREE,
13189 declspecs->locations);
13190 }
13191 else if (decl_context == FIELD)
13192 {
13193 if (!staticp && !friendp && TREE_CODE (type) != METHOD_TYPE)
13194 if (tree auto_node = type_uses_auto (type))
13195 {
13196 location_t tloc = declspecs->locations[ds_type_spec];
13197 if (CLASS_PLACEHOLDER_TEMPLATE (auto_node))
13198 error_at (tloc, "invalid use of template-name %qE without an "
13199 "argument list",
13200 CLASS_PLACEHOLDER_TEMPLATE (auto_node));
13201 else
13202 error_at (tloc, "non-static data member declared with "
13203 "placeholder %qT", auto_node);
13204 type = error_mark_node;
13205 }
13206
13207 /* The C99 flexible array extension. */
13208 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
13209 && TYPE_DOMAIN (type) == NULL_TREE)
13210 {
13211 if (ctype
13212 && (TREE_CODE (ctype) == UNION_TYPE
13213 || TREE_CODE (ctype) == QUAL_UNION_TYPE))
13214 {
13215 error_at (id_loc, "flexible array member in union");
13216 type = error_mark_node;
13217 }
13218 else
13219 {
13220 /* Array is a flexible member. */
13221 if (name)
13222 pedwarn (id_loc, OPT_Wpedantic,
13223 "ISO C++ forbids flexible array member %qs", name);
13224 else
13225 pedwarn (input_location, OPT_Wpedantic,
13226 "ISO C++ forbids flexible array members");
13227
13228 /* Flexible array member has a null domain. */
13229 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
13230 }
13231 }
13232
13233 if (type == error_mark_node)
13234 {
13235 /* Happens when declaring arrays of sizes which
13236 are error_mark_node, for example. */
13237 decl = NULL_TREE;
13238 }
13239 else if (in_namespace && !friendp)
13240 {
13241 /* Something like struct S { int N::j; }; */
13242 error_at (id_loc, "invalid use of %<::%>");
13243 return error_mark_node;
13244 }
13245 else if (FUNC_OR_METHOD_TYPE_P (type) && unqualified_id)
13246 {
13247 int publicp = 0;
13248 tree function_context;
13249
13250 if (friendp == 0)
13251 {
13252 /* This should never happen in pure C++ (the check
13253 could be an assert). It could happen in
13254 Objective-C++ if someone writes invalid code that
13255 uses a function declaration for an instance
13256 variable or property (instance variables and
13257 properties are parsed as FIELD_DECLs, but they are
13258 part of an Objective-C class, not a C++ class).
13259 That code is invalid and is caught by this
13260 check. */
13261 if (!ctype)
13262 {
13263 error ("declaration of function %qD in invalid context",
13264 unqualified_id);
13265 return error_mark_node;
13266 }
13267
13268 /* ``A union may [ ... ] not [ have ] virtual functions.''
13269 ARM 9.5 */
13270 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
13271 {
13272 error_at (declspecs->locations[ds_virtual],
13273 "function %qD declared %<virtual%> inside a union",
13274 unqualified_id);
13275 return error_mark_node;
13276 }
13277
13278 if (virtualp
13279 && identifier_p (unqualified_id)
13280 && IDENTIFIER_NEWDEL_OP_P (unqualified_id))
13281 {
13282 error_at (declspecs->locations[ds_virtual],
13283 "%qD cannot be declared %<virtual%>, since it "
13284 "is always static", unqualified_id);
13285 virtualp = 0;
13286 }
13287 }
13288
13289 /* Check that the name used for a destructor makes sense. */
13290 if (sfk == sfk_destructor)
13291 {
13292 tree uqname = id_declarator->u.id.unqualified_name;
13293
13294 if (!ctype)
13295 {
13296 gcc_assert (friendp);
13297 error_at (id_loc, "expected qualified name in friend "
13298 "declaration for destructor %qD", uqname);
13299 return error_mark_node;
13300 }
13301
13302 if (!check_dtor_name (ctype, TREE_OPERAND (uqname, 0)))
13303 {
13304 error_at (id_loc, "declaration of %qD as member of %qT",
13305 uqname, ctype);
13306 return error_mark_node;
13307 }
13308 if (concept_p)
13309 {
13310 error_at (declspecs->locations[ds_concept],
13311 "a destructor cannot be %qs", "concept");
13312 return error_mark_node;
13313 }
13314 if (constexpr_p && cxx_dialect < cxx2a)
13315 {
13316 error_at (declspecs->locations[ds_constexpr],
13317 "%<constexpr%> destructors only available"
13318 " with %<-std=c++2a%> or %<-std=gnu++2a%>");
13319 return error_mark_node;
13320 }
13321 if (consteval_p)
13322 {
13323 error_at (declspecs->locations[ds_consteval],
13324 "a destructor cannot be %qs", "consteval");
13325 return error_mark_node;
13326 }
13327 }
13328 else if (sfk == sfk_constructor && friendp && !ctype)
13329 {
13330 error ("expected qualified name in friend declaration "
13331 "for constructor %qD",
13332 id_declarator->u.id.unqualified_name);
13333 return error_mark_node;
13334 }
13335 if (sfk == sfk_constructor)
13336 if (concept_p)
13337 {
13338 error_at (declspecs->locations[ds_concept],
13339 "a constructor cannot be %<concept%>");
13340 return error_mark_node;
13341 }
13342 if (concept_p)
13343 {
13344 error_at (declspecs->locations[ds_concept],
13345 "a concept cannot be a member function");
13346 concept_p = false;
13347 }
13348 else if (consteval_p
13349 && identifier_p (unqualified_id)
13350 && IDENTIFIER_NEWDEL_OP_P (unqualified_id))
13351 {
13352 error_at (declspecs->locations[ds_consteval],
13353 "%qD cannot be %qs", unqualified_id, "consteval");
13354 consteval_p = false;
13355 }
13356
13357 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
13358 {
13359 tree tmpl = TREE_OPERAND (unqualified_id, 0);
13360 if (variable_template_p (tmpl))
13361 {
13362 error_at (id_loc, "specialization of variable template "
13363 "%qD declared as function", tmpl);
13364 inform (DECL_SOURCE_LOCATION (tmpl),
13365 "variable template declared here");
13366 return error_mark_node;
13367 }
13368 }
13369
13370 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
13371 function_context
13372 = (ctype != NULL_TREE
13373 ? decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE);
13374 publicp = ((! friendp || ! staticp)
13375 && function_context == NULL_TREE);
13376
13377 decl = grokfndecl (ctype, type,
13378 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
13379 ? unqualified_id : dname,
13380 parms,
13381 unqualified_id,
13382 declspecs,
13383 reqs,
13384 virtualp, flags, memfn_quals, rqual, raises,
13385 friendp ? -1 : 0, friendp, publicp,
13386 inlinep | (2 * constexpr_p) | (4 * concept_p)
13387 | (8 * consteval_p),
13388 initialized == SD_DELETED, sfk,
13389 funcdef_flag, late_return_type_p,
13390 initialized,
13391 template_count, in_namespace,
13392 attrlist, id_loc);
13393 decl = set_virt_specifiers (decl, virt_specifiers);
13394 if (decl == NULL_TREE)
13395 return error_mark_node;
13396 #if 0
13397 /* This clobbers the attrs stored in `decl' from `attrlist'. */
13398 /* The decl and setting of decl_attr is also turned off. */
13399 decl = build_decl_attribute_variant (decl, decl_attr);
13400 #endif
13401
13402 /* [class.conv.ctor]
13403
13404 A constructor declared without the function-specifier
13405 explicit that can be called with a single parameter
13406 specifies a conversion from the type of its first
13407 parameter to the type of its class. Such a constructor
13408 is called a converting constructor. */
13409 if (explicitp == 2)
13410 DECL_NONCONVERTING_P (decl) = 1;
13411
13412 if (declspecs->explicit_specifier)
13413 store_explicit_specifier (decl, declspecs->explicit_specifier);
13414 }
13415 else if (!staticp
13416 && ((current_class_type
13417 && same_type_p (type, current_class_type))
13418 || (!dependent_type_p (type)
13419 && !COMPLETE_TYPE_P (complete_type (type))
13420 && (!complete_or_array_type_p (type)
13421 || initialized == 0))))
13422 {
13423 if (TREE_CODE (type) != ARRAY_TYPE
13424 || !COMPLETE_TYPE_P (TREE_TYPE (type)))
13425 {
13426 if (unqualified_id)
13427 {
13428 error_at (id_loc, "field %qD has incomplete type %qT",
13429 unqualified_id, type);
13430 cxx_incomplete_type_inform (strip_array_types (type));
13431 }
13432 else
13433 error ("name %qT has incomplete type", type);
13434
13435 type = error_mark_node;
13436 decl = NULL_TREE;
13437 }
13438 }
13439 else if (!verify_type_context (input_location,
13440 staticp
13441 ? TCTX_STATIC_STORAGE
13442 : TCTX_FIELD, type))
13443 {
13444 type = error_mark_node;
13445 decl = NULL_TREE;
13446 }
13447 else
13448 {
13449 if (friendp)
13450 {
13451 if (unqualified_id)
13452 error_at (id_loc,
13453 "%qE is neither function nor member function; "
13454 "cannot be declared friend", unqualified_id);
13455 else
13456 error ("unnamed field is neither function nor member "
13457 "function; cannot be declared friend");
13458 return error_mark_node;
13459 }
13460 decl = NULL_TREE;
13461 }
13462
13463 if (friendp)
13464 {
13465 /* Friends are treated specially. */
13466 if (ctype == current_class_type)
13467 ; /* We already issued a permerror. */
13468 else if (decl && DECL_NAME (decl))
13469 {
13470 if (initialized)
13471 /* Kludge: We need funcdef_flag to be true in do_friend for
13472 in-class defaulted functions, but that breaks grokfndecl.
13473 So set it here. */
13474 funcdef_flag = true;
13475 if (template_class_depth (current_class_type) == 0)
13476 {
13477 decl = check_explicit_specialization
13478 (unqualified_id, decl, template_count,
13479 2 * funcdef_flag + 4);
13480 if (decl == error_mark_node)
13481 return error_mark_node;
13482 }
13483
13484 tree scope = ctype ? ctype : in_namespace;
13485 decl = do_friend (scope, unqualified_id, decl,
13486 *attrlist, flags,
13487 funcdef_flag);
13488 return decl;
13489 }
13490 else
13491 return error_mark_node;
13492 }
13493
13494 /* Structure field. It may not be a function, except for C++. */
13495
13496 if (decl == NULL_TREE)
13497 {
13498 if (staticp)
13499 {
13500 /* C++ allows static class members. All other work
13501 for this is done by grokfield. */
13502 decl = build_lang_decl_loc (id_loc, VAR_DECL,
13503 unqualified_id, type);
13504 set_linkage_for_static_data_member (decl);
13505 if (concept_p)
13506 error_at (declspecs->locations[ds_concept],
13507 "static data member %qE declared %qs",
13508 unqualified_id, "concept");
13509 else if (constexpr_p && !initialized)
13510 {
13511 error_at (DECL_SOURCE_LOCATION (decl),
13512 "%<constexpr%> static data member %qD must "
13513 "have an initializer", decl);
13514 constexpr_p = false;
13515 }
13516 if (consteval_p)
13517 error_at (declspecs->locations[ds_consteval],
13518 "static data member %qE declared %qs",
13519 unqualified_id, "consteval");
13520
13521 if (inlinep)
13522 mark_inline_variable (decl, declspecs->locations[ds_inline]);
13523
13524 if (!DECL_VAR_DECLARED_INLINE_P (decl)
13525 && !(cxx_dialect >= cxx17 && constexpr_p))
13526 /* Even if there is an in-class initialization, DECL
13527 is considered undefined until an out-of-class
13528 definition is provided, unless this is an inline
13529 variable. */
13530 DECL_EXTERNAL (decl) = 1;
13531
13532 if (thread_p)
13533 {
13534 CP_DECL_THREAD_LOCAL_P (decl) = true;
13535 if (!processing_template_decl)
13536 set_decl_tls_model (decl, decl_default_tls_model (decl));
13537 if (declspecs->gnu_thread_keyword_p)
13538 SET_DECL_GNU_TLS_P (decl);
13539 }
13540 }
13541 else
13542 {
13543 if (concept_p)
13544 {
13545 error_at (declspecs->locations[ds_concept],
13546 "non-static data member %qE declared %qs",
13547 unqualified_id, "concept");
13548 concept_p = false;
13549 constexpr_p = false;
13550 }
13551 else if (constexpr_p)
13552 {
13553 error_at (declspecs->locations[ds_constexpr],
13554 "non-static data member %qE declared %qs",
13555 unqualified_id, "constexpr");
13556 constexpr_p = false;
13557 }
13558 if (constinit_p)
13559 {
13560 error_at (declspecs->locations[ds_constinit],
13561 "non-static data member %qE declared %qs",
13562 unqualified_id, "constinit");
13563 constinit_p = false;
13564 }
13565 if (consteval_p)
13566 {
13567 error_at (declspecs->locations[ds_consteval],
13568 "non-static data member %qE declared %qs",
13569 unqualified_id, "consteval");
13570 consteval_p = false;
13571 }
13572 decl = build_decl (id_loc, FIELD_DECL, unqualified_id, type);
13573 DECL_NONADDRESSABLE_P (decl) = bitfield;
13574 if (bitfield && !unqualified_id)
13575 {
13576 TREE_NO_WARNING (decl) = 1;
13577 DECL_PADDING_P (decl) = 1;
13578 }
13579
13580 if (storage_class == sc_mutable)
13581 {
13582 DECL_MUTABLE_P (decl) = 1;
13583 storage_class = sc_none;
13584 }
13585
13586 if (initialized)
13587 {
13588 /* An attempt is being made to initialize a non-static
13589 member. This is new in C++11. */
13590 maybe_warn_cpp0x (CPP0X_NSDMI);
13591
13592 /* If this has been parsed with static storage class, but
13593 errors forced staticp to be cleared, ensure NSDMI is
13594 not present. */
13595 if (declspecs->storage_class == sc_static)
13596 DECL_INITIAL (decl) = error_mark_node;
13597 }
13598 }
13599
13600 bad_specifiers (decl, BSP_FIELD, virtualp,
13601 memfn_quals != TYPE_UNQUALIFIED,
13602 staticp ? false : inlinep, friendp,
13603 raises != NULL_TREE,
13604 declspecs->locations);
13605 }
13606 }
13607 else if (FUNC_OR_METHOD_TYPE_P (type))
13608 {
13609 tree original_name;
13610 int publicp = 0;
13611
13612 if (!unqualified_id)
13613 return error_mark_node;
13614
13615 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
13616 original_name = dname;
13617 else
13618 original_name = unqualified_id;
13619 // FIXME:gcc_assert (original_name == dname);
13620
13621 if (storage_class == sc_auto)
13622 error_at (declspecs->locations[ds_storage_class],
13623 "storage class %<auto%> invalid for function %qs", name);
13624 else if (storage_class == sc_register)
13625 error_at (declspecs->locations[ds_storage_class],
13626 "storage class %<register%> invalid for function %qs",
13627 name);
13628 else if (thread_p)
13629 {
13630 if (declspecs->gnu_thread_keyword_p)
13631 error_at (declspecs->locations[ds_thread],
13632 "storage class %<__thread%> invalid for function %qs",
13633 name);
13634 else
13635 error_at (declspecs->locations[ds_thread],
13636 "storage class %<thread_local%> invalid for "
13637 "function %qs", name);
13638 }
13639
13640 if (virt_specifiers)
13641 error ("virt-specifiers in %qs not allowed outside a class "
13642 "definition", name);
13643 /* Function declaration not at top level.
13644 Storage classes other than `extern' are not allowed
13645 and `extern' makes no difference. */
13646 if (! toplevel_bindings_p ()
13647 && (storage_class == sc_static
13648 || decl_spec_seq_has_spec_p (declspecs, ds_inline))
13649 && pedantic)
13650 {
13651 if (storage_class == sc_static)
13652 pedwarn (declspecs->locations[ds_storage_class], OPT_Wpedantic,
13653 "%<static%> specifier invalid for function %qs "
13654 "declared out of global scope", name);
13655 else
13656 pedwarn (declspecs->locations[ds_inline], OPT_Wpedantic,
13657 "%<inline%> specifier invalid for function %qs "
13658 "declared out of global scope", name);
13659 }
13660
13661 if (ctype == NULL_TREE)
13662 {
13663 if (virtualp)
13664 {
13665 error ("virtual non-class function %qs", name);
13666 virtualp = 0;
13667 }
13668 else if (sfk == sfk_constructor
13669 || sfk == sfk_destructor)
13670 {
13671 error (funcdef_flag
13672 ? G_("%qs defined in a non-class scope")
13673 : G_("%qs declared in a non-class scope"), name);
13674 sfk = sfk_none;
13675 }
13676 }
13677 if (consteval_p
13678 && identifier_p (unqualified_id)
13679 && IDENTIFIER_NEWDEL_OP_P (unqualified_id))
13680 {
13681 error_at (declspecs->locations[ds_consteval],
13682 "%qD cannot be %qs", unqualified_id, "consteval");
13683 consteval_p = false;
13684 }
13685
13686 /* Record whether the function is public. */
13687 publicp = (ctype != NULL_TREE
13688 || storage_class != sc_static);
13689
13690 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
13691 declspecs,
13692 reqs, virtualp, flags, memfn_quals, rqual, raises,
13693 1, friendp,
13694 publicp,
13695 inlinep | (2 * constexpr_p) | (4 * concept_p)
13696 | (8 * consteval_p),
13697 initialized == SD_DELETED,
13698 sfk,
13699 funcdef_flag,
13700 late_return_type_p,
13701 initialized,
13702 template_count, in_namespace, attrlist,
13703 id_loc);
13704 if (decl == NULL_TREE)
13705 return error_mark_node;
13706
13707 if (explicitp == 2)
13708 DECL_NONCONVERTING_P (decl) = 1;
13709 if (staticp == 1)
13710 {
13711 int invalid_static = 0;
13712
13713 /* Don't allow a static member function in a class, and forbid
13714 declaring main to be static. */
13715 if (TREE_CODE (type) == METHOD_TYPE)
13716 {
13717 permerror (input_location, "cannot declare member function %qD to have "
13718 "static linkage", decl);
13719 invalid_static = 1;
13720 }
13721 else if (current_function_decl)
13722 {
13723 /* 7.1.1: There can be no static function declarations within a
13724 block. */
13725 error_at (declspecs->locations[ds_storage_class],
13726 "cannot declare static function inside another function");
13727 invalid_static = 1;
13728 }
13729
13730 if (invalid_static)
13731 {
13732 staticp = 0;
13733 storage_class = sc_none;
13734 }
13735 }
13736 }
13737 else
13738 {
13739 /* It's a variable. */
13740
13741 /* An uninitialized decl with `extern' is a reference. */
13742 decl = grokvardecl (type, dname, unqualified_id,
13743 declspecs,
13744 initialized,
13745 type_quals,
13746 inlinep,
13747 concept_p,
13748 template_count,
13749 ctype ? ctype : in_namespace,
13750 id_loc);
13751 if (decl == NULL_TREE)
13752 return error_mark_node;
13753
13754 bad_specifiers (decl, BSP_VAR, virtualp,
13755 memfn_quals != TYPE_UNQUALIFIED,
13756 inlinep, friendp, raises != NULL_TREE,
13757 declspecs->locations);
13758
13759 if (ctype)
13760 {
13761 DECL_CONTEXT (decl) = ctype;
13762 if (staticp == 1)
13763 {
13764 permerror (declspecs->locations[ds_storage_class],
13765 "%<static%> may not be used when defining "
13766 "(as opposed to declaring) a static data member");
13767 staticp = 0;
13768 storage_class = sc_none;
13769 }
13770 if (storage_class == sc_register && TREE_STATIC (decl))
13771 {
13772 error ("static member %qD declared %<register%>", decl);
13773 storage_class = sc_none;
13774 }
13775 if (storage_class == sc_extern && pedantic)
13776 {
13777 pedwarn (input_location, OPT_Wpedantic,
13778 "cannot explicitly declare member %q#D to have "
13779 "extern linkage", decl);
13780 storage_class = sc_none;
13781 }
13782 }
13783 else if (constexpr_p && DECL_EXTERNAL (decl))
13784 {
13785 error_at (DECL_SOURCE_LOCATION (decl),
13786 "declaration of %<constexpr%> variable %qD "
13787 "is not a definition", decl);
13788 constexpr_p = false;
13789 }
13790 if (consteval_p)
13791 {
13792 error_at (DECL_SOURCE_LOCATION (decl),
13793 "a variable cannot be declared %<consteval%>");
13794 consteval_p = false;
13795 }
13796
13797 if (inlinep)
13798 mark_inline_variable (decl, declspecs->locations[ds_inline]);
13799 if (innermost_code == cdk_decomp)
13800 {
13801 gcc_assert (declarator && declarator->kind == cdk_decomp);
13802 DECL_SOURCE_LOCATION (decl) = id_loc;
13803 DECL_ARTIFICIAL (decl) = 1;
13804 fit_decomposition_lang_decl (decl, NULL_TREE);
13805 }
13806 }
13807
13808 if (VAR_P (decl) && !initialized)
13809 if (tree auto_node = type_uses_auto (type))
13810 if (!CLASS_PLACEHOLDER_TEMPLATE (auto_node))
13811 {
13812 location_t loc = declspecs->locations[ds_type_spec];
13813 error_at (loc, "declaration of %q#D has no initializer", decl);
13814 TREE_TYPE (decl) = error_mark_node;
13815 }
13816
13817 if (storage_class == sc_extern && initialized && !funcdef_flag)
13818 {
13819 if (toplevel_bindings_p ())
13820 {
13821 /* It's common practice (and completely valid) to have a const
13822 be initialized and declared extern. */
13823 if (!(type_quals & TYPE_QUAL_CONST))
13824 warning_at (DECL_SOURCE_LOCATION (decl), 0,
13825 "%qs initialized and declared %<extern%>", name);
13826 }
13827 else
13828 {
13829 error_at (DECL_SOURCE_LOCATION (decl),
13830 "%qs has both %<extern%> and initializer", name);
13831 return error_mark_node;
13832 }
13833 }
13834
13835 /* Record `register' declaration for warnings on &
13836 and in case doing stupid register allocation. */
13837
13838 if (storage_class == sc_register)
13839 {
13840 DECL_REGISTER (decl) = 1;
13841 /* Warn about register storage specifiers on PARM_DECLs. */
13842 if (TREE_CODE (decl) == PARM_DECL)
13843 {
13844 if (cxx_dialect >= cxx17)
13845 pedwarn (DECL_SOURCE_LOCATION (decl), OPT_Wregister,
13846 "ISO C++17 does not allow %<register%> storage "
13847 "class specifier");
13848 else
13849 warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wregister,
13850 "%<register%> storage class specifier used");
13851 }
13852 }
13853 else if (storage_class == sc_extern)
13854 DECL_THIS_EXTERN (decl) = 1;
13855 else if (storage_class == sc_static)
13856 DECL_THIS_STATIC (decl) = 1;
13857
13858 /* Set constexpr flag on vars (functions got it in grokfndecl). */
13859 if (constexpr_p && VAR_P (decl))
13860 DECL_DECLARED_CONSTEXPR_P (decl) = true;
13861
13862 /* Record constancy and volatility on the DECL itself . There's
13863 no need to do this when processing a template; we'll do this
13864 for the instantiated declaration based on the type of DECL. */
13865 if (!processing_template_decl)
13866 cp_apply_type_quals_to_decl (type_quals, decl);
13867
13868 return decl;
13869 }
13870 }
13871
13872 /* Subroutine of start_function. Ensure that each of the parameter
13873 types (as listed in PARMS) is complete, as is required for a
13874 function definition. */
13875
13876 static void
require_complete_types_for_parms(tree parms)13877 require_complete_types_for_parms (tree parms)
13878 {
13879 for (; parms; parms = DECL_CHAIN (parms))
13880 {
13881 if (dependent_type_p (TREE_TYPE (parms)))
13882 continue;
13883 if (!VOID_TYPE_P (TREE_TYPE (parms))
13884 && complete_type_or_else (TREE_TYPE (parms), parms))
13885 {
13886 relayout_decl (parms);
13887 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
13888
13889 maybe_warn_parm_abi (TREE_TYPE (parms),
13890 DECL_SOURCE_LOCATION (parms));
13891 }
13892 else
13893 /* grokparms or complete_type_or_else will have already issued
13894 an error. */
13895 TREE_TYPE (parms) = error_mark_node;
13896 }
13897 }
13898
13899 /* Returns nonzero if T is a local variable. */
13900
13901 int
local_variable_p(const_tree t)13902 local_variable_p (const_tree t)
13903 {
13904 if ((VAR_P (t)
13905 /* A VAR_DECL with a context that is a _TYPE is a static data
13906 member. */
13907 && !TYPE_P (CP_DECL_CONTEXT (t))
13908 /* Any other non-local variable must be at namespace scope. */
13909 && !DECL_NAMESPACE_SCOPE_P (t))
13910 || (TREE_CODE (t) == PARM_DECL))
13911 return 1;
13912
13913 return 0;
13914 }
13915
13916 /* Like local_variable_p, but suitable for use as a tree-walking
13917 function. */
13918
13919 static tree
local_variable_p_walkfn(tree * tp,int * walk_subtrees,void *)13920 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
13921 void * /*data*/)
13922 {
13923 if (local_variable_p (*tp)
13924 && (!DECL_ARTIFICIAL (*tp) || DECL_NAME (*tp) == this_identifier))
13925 return *tp;
13926 else if (TYPE_P (*tp))
13927 *walk_subtrees = 0;
13928
13929 return NULL_TREE;
13930 }
13931
13932 /* Check that ARG, which is a default-argument expression for a
13933 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
13934 something goes wrong. DECL may also be a _TYPE node, rather than a
13935 DECL, if there is no DECL available. */
13936
13937 tree
check_default_argument(tree decl,tree arg,tsubst_flags_t complain)13938 check_default_argument (tree decl, tree arg, tsubst_flags_t complain)
13939 {
13940 tree var;
13941 tree decl_type;
13942
13943 if (TREE_CODE (arg) == DEFERRED_PARSE)
13944 /* We get a DEFERRED_PARSE when looking at an in-class declaration
13945 with a default argument. Ignore the argument for now; we'll
13946 deal with it after the class is complete. */
13947 return arg;
13948
13949 if (TYPE_P (decl))
13950 {
13951 decl_type = decl;
13952 decl = NULL_TREE;
13953 }
13954 else
13955 decl_type = TREE_TYPE (decl);
13956
13957 if (arg == error_mark_node
13958 || decl == error_mark_node
13959 || TREE_TYPE (arg) == error_mark_node
13960 || decl_type == error_mark_node)
13961 /* Something already went wrong. There's no need to check
13962 further. */
13963 return error_mark_node;
13964
13965 /* [dcl.fct.default]
13966
13967 A default argument expression is implicitly converted to the
13968 parameter type. */
13969 ++cp_unevaluated_operand;
13970 /* Avoid digest_init clobbering the initializer. */
13971 tree carg = BRACE_ENCLOSED_INITIALIZER_P (arg) ? unshare_expr (arg): arg;
13972 perform_implicit_conversion_flags (decl_type, carg, complain,
13973 LOOKUP_IMPLICIT);
13974 --cp_unevaluated_operand;
13975
13976 /* Avoid redundant -Wzero-as-null-pointer-constant warnings at
13977 the call sites. */
13978 if (TYPE_PTR_OR_PTRMEM_P (decl_type)
13979 && null_ptr_cst_p (arg)
13980 /* Don't lose side-effects as in PR90473. */
13981 && !TREE_SIDE_EFFECTS (arg))
13982 return nullptr_node;
13983
13984 /* [dcl.fct.default]
13985
13986 Local variables shall not be used in default argument
13987 expressions.
13988
13989 The keyword `this' shall not be used in a default argument of a
13990 member function. */
13991 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
13992 if (var)
13993 {
13994 if (complain & tf_warning_or_error)
13995 {
13996 if (DECL_NAME (var) == this_identifier)
13997 permerror (input_location, "default argument %qE uses %qD",
13998 arg, var);
13999 else
14000 error ("default argument %qE uses local variable %qD", arg, var);
14001 }
14002 return error_mark_node;
14003 }
14004
14005 /* All is well. */
14006 return arg;
14007 }
14008
14009 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
14010
14011 static tree
type_is_deprecated(tree type)14012 type_is_deprecated (tree type)
14013 {
14014 enum tree_code code;
14015 if (TREE_DEPRECATED (type))
14016 return type;
14017 if (TYPE_NAME (type))
14018 {
14019 if (TREE_DEPRECATED (TYPE_NAME (type)))
14020 return type;
14021 else
14022 {
14023 cp_warn_deprecated_use_scopes (CP_DECL_CONTEXT (TYPE_NAME (type)));
14024 return NULL_TREE;
14025 }
14026 }
14027
14028 /* Do warn about using typedefs to a deprecated class. */
14029 if (OVERLOAD_TYPE_P (type) && type != TYPE_MAIN_VARIANT (type))
14030 return type_is_deprecated (TYPE_MAIN_VARIANT (type));
14031
14032 code = TREE_CODE (type);
14033
14034 if (code == POINTER_TYPE || code == REFERENCE_TYPE
14035 || code == OFFSET_TYPE || code == FUNCTION_TYPE
14036 || code == METHOD_TYPE || code == ARRAY_TYPE)
14037 return type_is_deprecated (TREE_TYPE (type));
14038
14039 if (TYPE_PTRMEMFUNC_P (type))
14040 return type_is_deprecated
14041 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type))));
14042
14043 return NULL_TREE;
14044 }
14045
14046 /* Decode the list of parameter types for a function type.
14047 Given the list of things declared inside the parens,
14048 return a list of types.
14049
14050 If this parameter does not end with an ellipsis, we append
14051 void_list_node.
14052
14053 *PARMS is set to the chain of PARM_DECLs created. */
14054
14055 tree
grokparms(tree parmlist,tree * parms)14056 grokparms (tree parmlist, tree *parms)
14057 {
14058 tree result = NULL_TREE;
14059 tree decls = NULL_TREE;
14060 tree parm;
14061 int any_error = 0;
14062
14063 for (parm = parmlist; parm != NULL_TREE; parm = TREE_CHAIN (parm))
14064 {
14065 tree type = NULL_TREE;
14066 tree init = TREE_PURPOSE (parm);
14067 tree decl = TREE_VALUE (parm);
14068
14069 if (parm == void_list_node)
14070 break;
14071
14072 if (! decl || TREE_TYPE (decl) == error_mark_node)
14073 continue;
14074
14075 type = TREE_TYPE (decl);
14076 if (VOID_TYPE_P (type))
14077 {
14078 if (same_type_p (type, void_type_node)
14079 && !init
14080 && !DECL_NAME (decl) && !result
14081 && TREE_CHAIN (parm) == void_list_node)
14082 /* DR 577: A parameter list consisting of a single
14083 unnamed parameter of non-dependent type 'void'. */
14084 break;
14085 else if (cv_qualified_p (type))
14086 error_at (DECL_SOURCE_LOCATION (decl),
14087 "invalid use of cv-qualified type %qT in "
14088 "parameter declaration", type);
14089 else
14090 error_at (DECL_SOURCE_LOCATION (decl),
14091 "invalid use of type %<void%> in parameter "
14092 "declaration");
14093 /* It's not a good idea to actually create parameters of
14094 type `void'; other parts of the compiler assume that a
14095 void type terminates the parameter list. */
14096 type = error_mark_node;
14097 TREE_TYPE (decl) = error_mark_node;
14098 }
14099
14100 if (type != error_mark_node)
14101 {
14102 if (deprecated_state != DEPRECATED_SUPPRESS)
14103 {
14104 tree deptype = type_is_deprecated (type);
14105 if (deptype)
14106 cp_warn_deprecated_use (deptype);
14107 }
14108
14109 /* [dcl.fct] "A parameter with volatile-qualified type is
14110 deprecated." */
14111 if (CP_TYPE_VOLATILE_P (type))
14112 warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wvolatile,
14113 "%<volatile%>-qualified parameter is "
14114 "deprecated");
14115
14116 /* Top-level qualifiers on the parameters are
14117 ignored for function types. */
14118 type = cp_build_qualified_type (type, 0);
14119 if (TREE_CODE (type) == METHOD_TYPE)
14120 {
14121 error ("parameter %qD invalidly declared method type", decl);
14122 type = build_pointer_type (type);
14123 TREE_TYPE (decl) = type;
14124 }
14125 else if (abstract_virtuals_error (decl, type))
14126 any_error = 1; /* Seems like a good idea. */
14127 else if (cxx_dialect < cxx17 && INDIRECT_TYPE_P (type))
14128 {
14129 /* Before C++17 DR 393:
14130 [dcl.fct]/6, parameter types cannot contain pointers
14131 (references) to arrays of unknown bound. */
14132 tree t = TREE_TYPE (type);
14133 int ptr = TYPE_PTR_P (type);
14134
14135 while (1)
14136 {
14137 if (TYPE_PTR_P (t))
14138 ptr = 1;
14139 else if (TREE_CODE (t) != ARRAY_TYPE)
14140 break;
14141 else if (!TYPE_DOMAIN (t))
14142 break;
14143 t = TREE_TYPE (t);
14144 }
14145 if (TREE_CODE (t) == ARRAY_TYPE)
14146 pedwarn (DECL_SOURCE_LOCATION (decl), OPT_Wpedantic,
14147 ptr
14148 ? G_("parameter %qD includes pointer to array of "
14149 "unknown bound %qT")
14150 : G_("parameter %qD includes reference to array of "
14151 "unknown bound %qT"),
14152 decl, t);
14153 }
14154
14155 if (any_error)
14156 init = NULL_TREE;
14157 else if (init && !processing_template_decl)
14158 init = check_default_argument (decl, init, tf_warning_or_error);
14159 }
14160
14161 DECL_CHAIN (decl) = decls;
14162 decls = decl;
14163 result = tree_cons (init, type, result);
14164 }
14165 decls = nreverse (decls);
14166 result = nreverse (result);
14167 if (parm)
14168 result = chainon (result, void_list_node);
14169 *parms = decls;
14170
14171 return result;
14172 }
14173
14174
14175 /* D is a constructor or overloaded `operator='.
14176
14177 Let T be the class in which D is declared. Then, this function
14178 returns:
14179
14180 -1 if D's is an ill-formed constructor or copy assignment operator
14181 whose first parameter is of type `T'.
14182 0 if D is not a copy constructor or copy assignment
14183 operator.
14184 1 if D is a copy constructor or copy assignment operator whose
14185 first parameter is a reference to non-const qualified T.
14186 2 if D is a copy constructor or copy assignment operator whose
14187 first parameter is a reference to const qualified T.
14188
14189 This function can be used as a predicate. Positive values indicate
14190 a copy constructor and nonzero values indicate a copy assignment
14191 operator. */
14192
14193 int
copy_fn_p(const_tree d)14194 copy_fn_p (const_tree d)
14195 {
14196 tree args;
14197 tree arg_type;
14198 int result = 1;
14199
14200 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
14201
14202 if (TREE_CODE (d) == TEMPLATE_DECL
14203 || (DECL_TEMPLATE_INFO (d)
14204 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
14205 /* Instantiations of template member functions are never copy
14206 functions. Note that member functions of templated classes are
14207 represented as template functions internally, and we must
14208 accept those as copy functions. */
14209 return 0;
14210
14211 args = FUNCTION_FIRST_USER_PARMTYPE (d);
14212 if (!args)
14213 return 0;
14214
14215 arg_type = TREE_VALUE (args);
14216 if (arg_type == error_mark_node)
14217 return 0;
14218
14219 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
14220 {
14221 /* Pass by value copy assignment operator. */
14222 result = -1;
14223 }
14224 else if (TYPE_REF_P (arg_type)
14225 && !TYPE_REF_IS_RVALUE (arg_type)
14226 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
14227 {
14228 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
14229 result = 2;
14230 }
14231 else
14232 return 0;
14233
14234 args = TREE_CHAIN (args);
14235
14236 if (args && args != void_list_node && !TREE_PURPOSE (args))
14237 /* There are more non-optional args. */
14238 return 0;
14239
14240 return result;
14241 }
14242
14243 /* D is a constructor or overloaded `operator='.
14244
14245 Let T be the class in which D is declared. Then, this function
14246 returns true when D is a move constructor or move assignment
14247 operator, false otherwise. */
14248
14249 bool
move_fn_p(const_tree d)14250 move_fn_p (const_tree d)
14251 {
14252 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
14253
14254 if (cxx_dialect == cxx98)
14255 /* There are no move constructors if we are in C++98 mode. */
14256 return false;
14257
14258 if (TREE_CODE (d) == TEMPLATE_DECL
14259 || (DECL_TEMPLATE_INFO (d)
14260 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
14261 /* Instantiations of template member functions are never move
14262 functions. Note that member functions of templated classes are
14263 represented as template functions internally, and we must
14264 accept those as move functions. */
14265 return 0;
14266
14267 return move_signature_fn_p (d);
14268 }
14269
14270 /* D is a constructor or overloaded `operator='.
14271
14272 Then, this function returns true when D has the same signature as a move
14273 constructor or move assignment operator (because either it is such a
14274 ctor/op= or it is a template specialization with the same signature),
14275 false otherwise. */
14276
14277 bool
move_signature_fn_p(const_tree d)14278 move_signature_fn_p (const_tree d)
14279 {
14280 tree args;
14281 tree arg_type;
14282 bool result = false;
14283
14284 args = FUNCTION_FIRST_USER_PARMTYPE (d);
14285 if (!args)
14286 return 0;
14287
14288 arg_type = TREE_VALUE (args);
14289 if (arg_type == error_mark_node)
14290 return 0;
14291
14292 if (TYPE_REF_P (arg_type)
14293 && TYPE_REF_IS_RVALUE (arg_type)
14294 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
14295 DECL_CONTEXT (d)))
14296 result = true;
14297
14298 args = TREE_CHAIN (args);
14299
14300 if (args && args != void_list_node && !TREE_PURPOSE (args))
14301 /* There are more non-optional args. */
14302 return false;
14303
14304 return result;
14305 }
14306
14307 /* Remember any special properties of member function DECL. */
14308
14309 void
grok_special_member_properties(tree decl)14310 grok_special_member_properties (tree decl)
14311 {
14312 tree class_type;
14313
14314 if (TREE_CODE (decl) == USING_DECL
14315 || !DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
14316 return;
14317
14318 class_type = DECL_CONTEXT (decl);
14319 if (IDENTIFIER_CTOR_P (DECL_NAME (decl)))
14320 {
14321 int ctor = copy_fn_p (decl);
14322
14323 if (!DECL_ARTIFICIAL (decl))
14324 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
14325
14326 if (ctor > 0)
14327 {
14328 /* [class.copy]
14329
14330 A non-template constructor for class X is a copy
14331 constructor if its first parameter is of type X&, const
14332 X&, volatile X& or const volatile X&, and either there
14333 are no other parameters or else all other parameters have
14334 default arguments. */
14335 TYPE_HAS_COPY_CTOR (class_type) = 1;
14336 if (ctor > 1)
14337 TYPE_HAS_CONST_COPY_CTOR (class_type) = 1;
14338 }
14339 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
14340 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
14341 else if (is_list_ctor (decl))
14342 TYPE_HAS_LIST_CTOR (class_type) = 1;
14343
14344 if (DECL_DECLARED_CONSTEXPR_P (decl)
14345 && !ctor && !move_fn_p (decl))
14346 TYPE_HAS_CONSTEXPR_CTOR (class_type) = 1;
14347 }
14348 else if (DECL_NAME (decl) == assign_op_identifier)
14349 {
14350 /* [class.copy]
14351
14352 A non-template assignment operator for class X is a copy
14353 assignment operator if its parameter is of type X, X&, const
14354 X&, volatile X& or const volatile X&. */
14355
14356 int assop = copy_fn_p (decl);
14357
14358 if (assop)
14359 {
14360 TYPE_HAS_COPY_ASSIGN (class_type) = 1;
14361 if (assop != 1)
14362 TYPE_HAS_CONST_COPY_ASSIGN (class_type) = 1;
14363 }
14364 }
14365 else if (IDENTIFIER_CONV_OP_P (DECL_NAME (decl)))
14366 TYPE_HAS_CONVERSION (class_type) = true;
14367
14368 /* Destructors are handled in check_methods. */
14369 }
14370
14371 /* Check a constructor DECL has the correct form. Complains
14372 if the class has a constructor of the form X(X). */
14373
14374 bool
grok_ctor_properties(const_tree ctype,const_tree decl)14375 grok_ctor_properties (const_tree ctype, const_tree decl)
14376 {
14377 int ctor_parm = copy_fn_p (decl);
14378
14379 if (ctor_parm < 0)
14380 {
14381 /* [class.copy]
14382
14383 A declaration of a constructor for a class X is ill-formed if
14384 its first parameter is of type (optionally cv-qualified) X
14385 and either there are no other parameters or else all other
14386 parameters have default arguments.
14387
14388 We *don't* complain about member template instantiations that
14389 have this form, though; they can occur as we try to decide
14390 what constructor to use during overload resolution. Since
14391 overload resolution will never prefer such a constructor to
14392 the non-template copy constructor (which is either explicitly
14393 or implicitly defined), there's no need to worry about their
14394 existence. Theoretically, they should never even be
14395 instantiated, but that's hard to forestall. */
14396 error_at (DECL_SOURCE_LOCATION (decl),
14397 "invalid constructor; you probably meant %<%T (const %T&)%>",
14398 ctype, ctype);
14399 return false;
14400 }
14401
14402 return true;
14403 }
14404
14405 /* DECL is a declaration for an overloaded or conversion operator. If
14406 COMPLAIN is true, errors are issued for invalid declarations. */
14407
14408 bool
grok_op_properties(tree decl,bool complain)14409 grok_op_properties (tree decl, bool complain)
14410 {
14411 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
14412 bool methodp = TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE;
14413 tree name = DECL_NAME (decl);
14414 location_t loc = DECL_SOURCE_LOCATION (decl);
14415
14416 tree class_type = DECL_CONTEXT (decl);
14417 if (class_type && !CLASS_TYPE_P (class_type))
14418 class_type = NULL_TREE;
14419
14420 tree_code operator_code;
14421 unsigned op_flags;
14422 if (IDENTIFIER_CONV_OP_P (name))
14423 {
14424 /* Conversion operators are TYPE_EXPR for the purposes of this
14425 function. */
14426 operator_code = TYPE_EXPR;
14427 op_flags = OVL_OP_FLAG_UNARY;
14428 }
14429 else
14430 {
14431 const ovl_op_info_t *ovl_op = IDENTIFIER_OVL_OP_INFO (name);
14432
14433 operator_code = ovl_op->tree_code;
14434 op_flags = ovl_op->flags;
14435 gcc_checking_assert (operator_code != ERROR_MARK);
14436 DECL_OVERLOADED_OPERATOR_CODE_RAW (decl) = ovl_op->ovl_op_code;
14437 }
14438
14439 if (op_flags & OVL_OP_FLAG_ALLOC)
14440 {
14441 /* operator new and operator delete are quite special. */
14442 if (class_type)
14443 switch (op_flags)
14444 {
14445 case OVL_OP_FLAG_ALLOC:
14446 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
14447 break;
14448
14449 case OVL_OP_FLAG_ALLOC | OVL_OP_FLAG_DELETE:
14450 TYPE_GETS_DELETE (class_type) |= 1;
14451 break;
14452
14453 case OVL_OP_FLAG_ALLOC | OVL_OP_FLAG_VEC:
14454 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
14455 break;
14456
14457 case OVL_OP_FLAG_ALLOC | OVL_OP_FLAG_DELETE | OVL_OP_FLAG_VEC:
14458 TYPE_GETS_DELETE (class_type) |= 2;
14459 break;
14460
14461 default:
14462 gcc_unreachable ();
14463 }
14464
14465 /* [basic.std.dynamic.allocation]/1:
14466
14467 A program is ill-formed if an allocation function is declared
14468 in a namespace scope other than global scope or declared
14469 static in global scope.
14470
14471 The same also holds true for deallocation functions. */
14472 if (DECL_NAMESPACE_SCOPE_P (decl))
14473 {
14474 if (CP_DECL_CONTEXT (decl) != global_namespace)
14475 {
14476 error_at (loc, "%qD may not be declared within a namespace",
14477 decl);
14478 return false;
14479 }
14480
14481 if (!TREE_PUBLIC (decl))
14482 {
14483 error_at (loc, "%qD may not be declared as static", decl);
14484 return false;
14485 }
14486 }
14487
14488 if (op_flags & OVL_OP_FLAG_DELETE)
14489 {
14490 DECL_SET_IS_OPERATOR_DELETE (decl, true);
14491 coerce_delete_type (decl, loc);
14492 }
14493 else
14494 {
14495 DECL_SET_IS_OPERATOR_NEW (decl, true);
14496 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl), loc);
14497 }
14498
14499 return true;
14500 }
14501
14502 /* An operator function must either be a non-static member function
14503 or have at least one parameter of a class, a reference to a class,
14504 an enumeration, or a reference to an enumeration. 13.4.0.6 */
14505 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
14506 {
14507 if (operator_code == TYPE_EXPR
14508 || operator_code == CALL_EXPR
14509 || operator_code == COMPONENT_REF
14510 || operator_code == ARRAY_REF
14511 || operator_code == NOP_EXPR)
14512 {
14513 error_at (loc, "%qD must be a nonstatic member function", decl);
14514 return false;
14515 }
14516
14517 if (DECL_STATIC_FUNCTION_P (decl))
14518 {
14519 error_at (loc, "%qD must be either a non-static member "
14520 "function or a non-member function", decl);
14521 return false;
14522 }
14523
14524 for (tree arg = argtypes; ; arg = TREE_CHAIN (arg))
14525 {
14526 if (!arg || arg == void_list_node)
14527 {
14528 if (complain)
14529 error_at(loc, "%qD must have an argument of class or "
14530 "enumerated type", decl);
14531 return false;
14532 }
14533
14534 tree type = non_reference (TREE_VALUE (arg));
14535 if (type == error_mark_node)
14536 return false;
14537
14538 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
14539 because these checks are performed even on template
14540 functions. */
14541 if (MAYBE_CLASS_TYPE_P (type)
14542 || TREE_CODE (type) == ENUMERAL_TYPE)
14543 break;
14544 }
14545 }
14546
14547 if (operator_code == CALL_EXPR)
14548 /* There are no further restrictions on the arguments to an overloaded
14549 "operator ()". */
14550 return true;
14551
14552 if (operator_code == COND_EXPR)
14553 {
14554 /* 13.4.0.3 */
14555 error_at (loc, "ISO C++ prohibits overloading %<operator ?:%>");
14556 return false;
14557 }
14558
14559 /* Count the number of arguments and check for ellipsis. */
14560 int arity = 0;
14561 for (tree arg = argtypes; arg != void_list_node; arg = TREE_CHAIN (arg))
14562 {
14563 if (!arg)
14564 {
14565 /* Variadic. */
14566 error_at (loc, "%qD must not have variable number of arguments",
14567 decl);
14568 return false;
14569 }
14570 ++arity;
14571 }
14572
14573 /* Verify correct number of arguments. */
14574 switch (op_flags)
14575 {
14576 case OVL_OP_FLAG_AMBIARY:
14577 if (arity == 1)
14578 {
14579 /* We have a unary instance of an ambi-ary op. Remap to the
14580 unary one. */
14581 unsigned alt = ovl_op_alternate[ovl_op_mapping [operator_code]];
14582 const ovl_op_info_t *ovl_op = &ovl_op_info[false][alt];
14583 gcc_checking_assert (ovl_op->flags == OVL_OP_FLAG_UNARY);
14584 operator_code = ovl_op->tree_code;
14585 DECL_OVERLOADED_OPERATOR_CODE_RAW (decl) = ovl_op->ovl_op_code;
14586 }
14587 else if (arity != 2)
14588 {
14589 /* This was an ambiguous operator but is invalid. */
14590 error_at (loc,
14591 methodp
14592 ? G_("%qD must have either zero or one argument")
14593 : G_("%qD must have either one or two arguments"), decl);
14594 return false;
14595 }
14596 else if ((operator_code == POSTINCREMENT_EXPR
14597 || operator_code == POSTDECREMENT_EXPR)
14598 && ! processing_template_decl
14599 /* x++ and x--'s second argument must be an int. */
14600 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)),
14601 integer_type_node))
14602 {
14603 error_at (loc,
14604 methodp
14605 ? G_("postfix %qD must have %<int%> as its argument")
14606 : G_("postfix %qD must have %<int%> as its second argument"),
14607 decl);
14608 return false;
14609 }
14610 break;
14611
14612 case OVL_OP_FLAG_UNARY:
14613 if (arity != 1)
14614 {
14615 error_at (loc,
14616 methodp
14617 ? G_("%qD must have no arguments")
14618 : G_("%qD must have exactly one argument"), decl);
14619 return false;
14620 }
14621 break;
14622
14623 case OVL_OP_FLAG_BINARY:
14624 if (arity != 2)
14625 {
14626 error_at (loc,
14627 methodp
14628 ? G_("%qD must have exactly one argument")
14629 : G_("%qD must have exactly two arguments"), decl);
14630 return false;
14631 }
14632 break;
14633
14634 default:
14635 gcc_unreachable ();
14636 }
14637
14638 /* There can be no default arguments. */
14639 for (tree arg = argtypes; arg != void_list_node; arg = TREE_CHAIN (arg))
14640 if (TREE_PURPOSE (arg))
14641 {
14642 TREE_PURPOSE (arg) = NULL_TREE;
14643 error_at (loc, "%qD cannot have default arguments", decl);
14644 return false;
14645 }
14646
14647 /* At this point the declaration is well-formed. It may not be
14648 sensible though. */
14649
14650 /* Check member function warnings only on the in-class declaration.
14651 There's no point warning on an out-of-class definition. */
14652 if (class_type && class_type != current_class_type)
14653 return true;
14654
14655 /* Warn about conversion operators that will never be used. */
14656 if (IDENTIFIER_CONV_OP_P (name)
14657 && ! DECL_TEMPLATE_INFO (decl)
14658 && warn_class_conversion)
14659 {
14660 tree t = TREE_TYPE (name);
14661 int ref = TYPE_REF_P (t);
14662
14663 if (ref)
14664 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
14665
14666 if (VOID_TYPE_P (t))
14667 warning_at (loc, OPT_Wclass_conversion, "converting %qT to %<void%> "
14668 "will never use a type conversion operator", class_type);
14669 else if (class_type)
14670 {
14671 if (same_type_ignoring_top_level_qualifiers_p (t, class_type))
14672 warning_at (loc, OPT_Wclass_conversion,
14673 ref
14674 ? G_("converting %qT to a reference to the same type "
14675 "will never use a type conversion operator")
14676 : G_("converting %qT to the same type "
14677 "will never use a type conversion operator"),
14678 class_type);
14679 /* Don't force t to be complete here. */
14680 else if (MAYBE_CLASS_TYPE_P (t)
14681 && COMPLETE_TYPE_P (t)
14682 && DERIVED_FROM_P (t, class_type))
14683 warning_at (loc, OPT_Wclass_conversion,
14684 ref
14685 ? G_("converting %qT to a reference to a base class "
14686 "%qT will never use a type conversion operator")
14687 : G_("converting %qT to a base class %qT "
14688 "will never use a type conversion operator"),
14689 class_type, t);
14690 }
14691 }
14692
14693 if (!warn_ecpp)
14694 return true;
14695
14696 /* Effective C++ rules below. */
14697
14698 /* More Effective C++ rule 7. */
14699 if (operator_code == TRUTH_ANDIF_EXPR
14700 || operator_code == TRUTH_ORIF_EXPR
14701 || operator_code == COMPOUND_EXPR)
14702 warning_at (loc, OPT_Weffc__,
14703 "user-defined %qD always evaluates both arguments", decl);
14704
14705 /* More Effective C++ rule 6. */
14706 if (operator_code == POSTINCREMENT_EXPR
14707 || operator_code == POSTDECREMENT_EXPR
14708 || operator_code == PREINCREMENT_EXPR
14709 || operator_code == PREDECREMENT_EXPR)
14710 {
14711 tree arg = TREE_VALUE (argtypes);
14712 tree ret = TREE_TYPE (TREE_TYPE (decl));
14713 if (methodp || TYPE_REF_P (arg))
14714 arg = TREE_TYPE (arg);
14715 arg = TYPE_MAIN_VARIANT (arg);
14716
14717 if (operator_code == PREINCREMENT_EXPR
14718 || operator_code == PREDECREMENT_EXPR)
14719 {
14720 if (!TYPE_REF_P (ret)
14721 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)), arg))
14722 warning_at (loc, OPT_Weffc__, "prefix %qD should return %qT", decl,
14723 build_reference_type (arg));
14724 }
14725 else
14726 {
14727 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
14728 warning_at (loc, OPT_Weffc__,
14729 "postfix %qD should return %qT", decl, arg);
14730 }
14731 }
14732
14733 /* Effective C++ rule 23. */
14734 if (!DECL_ASSIGNMENT_OPERATOR_P (decl)
14735 && (operator_code == PLUS_EXPR
14736 || operator_code == MINUS_EXPR
14737 || operator_code == TRUNC_DIV_EXPR
14738 || operator_code == MULT_EXPR
14739 || operator_code == TRUNC_MOD_EXPR)
14740 && TYPE_REF_P (TREE_TYPE (TREE_TYPE (decl))))
14741 warning_at (loc, OPT_Weffc__, "%qD should return by value", decl);
14742
14743 return true;
14744 }
14745
14746 /* Return a string giving the keyword associate with CODE. */
14747
14748 static const char *
tag_name(enum tag_types code)14749 tag_name (enum tag_types code)
14750 {
14751 switch (code)
14752 {
14753 case record_type:
14754 return "struct";
14755 case class_type:
14756 return "class";
14757 case union_type:
14758 return "union";
14759 case enum_type:
14760 return "enum";
14761 case typename_type:
14762 return "typename";
14763 default:
14764 gcc_unreachable ();
14765 }
14766 }
14767
14768 /* Name lookup in an elaborated-type-specifier (after the keyword
14769 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
14770 elaborated-type-specifier is invalid, issue a diagnostic and return
14771 error_mark_node; otherwise, return the *_TYPE to which it referred.
14772 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
14773
14774 tree
check_elaborated_type_specifier(enum tag_types tag_code,tree decl,bool allow_template_p)14775 check_elaborated_type_specifier (enum tag_types tag_code,
14776 tree decl,
14777 bool allow_template_p)
14778 {
14779 tree type;
14780
14781 /* In the case of:
14782
14783 struct S { struct S *p; };
14784
14785 name lookup will find the TYPE_DECL for the implicit "S::S"
14786 typedef. Adjust for that here. */
14787 if (DECL_SELF_REFERENCE_P (decl))
14788 decl = TYPE_NAME (TREE_TYPE (decl));
14789
14790 type = TREE_TYPE (decl);
14791
14792 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
14793 is false for this case as well. */
14794 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
14795 {
14796 error ("using template type parameter %qT after %qs",
14797 type, tag_name (tag_code));
14798 return error_mark_node;
14799 }
14800 /* Accept template template parameters. */
14801 else if (allow_template_p
14802 && (TREE_CODE (type) == BOUND_TEMPLATE_TEMPLATE_PARM
14803 || TREE_CODE (type) == TEMPLATE_TEMPLATE_PARM))
14804 ;
14805 /* [dcl.type.elab]
14806
14807 If the identifier resolves to a typedef-name or the
14808 simple-template-id resolves to an alias template
14809 specialization, the elaborated-type-specifier is ill-formed.
14810
14811 In other words, the only legitimate declaration to use in the
14812 elaborated type specifier is the implicit typedef created when
14813 the type is declared. */
14814 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
14815 && !DECL_SELF_REFERENCE_P (decl)
14816 && tag_code != typename_type)
14817 {
14818 if (alias_template_specialization_p (type, nt_opaque))
14819 error ("using alias template specialization %qT after %qs",
14820 type, tag_name (tag_code));
14821 else
14822 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
14823 inform (DECL_SOURCE_LOCATION (decl),
14824 "%qD has a previous declaration here", decl);
14825 return error_mark_node;
14826 }
14827 else if (TREE_CODE (type) != RECORD_TYPE
14828 && TREE_CODE (type) != UNION_TYPE
14829 && tag_code != enum_type
14830 && tag_code != typename_type)
14831 {
14832 error ("%qT referred to as %qs", type, tag_name (tag_code));
14833 inform (location_of (type), "%qT has a previous declaration here", type);
14834 return error_mark_node;
14835 }
14836 else if (TREE_CODE (type) != ENUMERAL_TYPE
14837 && tag_code == enum_type)
14838 {
14839 error ("%qT referred to as enum", type);
14840 inform (location_of (type), "%qT has a previous declaration here", type);
14841 return error_mark_node;
14842 }
14843 else if (!allow_template_p
14844 && TREE_CODE (type) == RECORD_TYPE
14845 && CLASSTYPE_IS_TEMPLATE (type))
14846 {
14847 /* If a class template appears as elaborated type specifier
14848 without a template header such as:
14849
14850 template <class T> class C {};
14851 void f(class C); // No template header here
14852
14853 then the required template argument is missing. */
14854 error ("template argument required for %<%s %T%>",
14855 tag_name (tag_code),
14856 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
14857 return error_mark_node;
14858 }
14859
14860 return type;
14861 }
14862
14863 /* Lookup NAME in elaborate type specifier in scope according to
14864 SCOPE and issue diagnostics if necessary.
14865 Return *_TYPE node upon success, NULL_TREE when the NAME is not
14866 found, and ERROR_MARK_NODE for type error. */
14867
14868 static tree
lookup_and_check_tag(enum tag_types tag_code,tree name,tag_scope scope,bool template_header_p)14869 lookup_and_check_tag (enum tag_types tag_code, tree name,
14870 tag_scope scope, bool template_header_p)
14871 {
14872 tree t;
14873 tree decl;
14874 if (scope == ts_global)
14875 {
14876 /* First try ordinary name lookup, ignoring hidden class name
14877 injected via friend declaration. */
14878 decl = lookup_name_prefer_type (name, 2);
14879 decl = strip_using_decl (decl);
14880 /* If that fails, the name will be placed in the smallest
14881 non-class, non-function-prototype scope according to 3.3.1/5.
14882 We may already have a hidden name declared as friend in this
14883 scope. So lookup again but not ignoring hidden names.
14884 If we find one, that name will be made visible rather than
14885 creating a new tag. */
14886 if (!decl)
14887 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
14888 }
14889 else
14890 decl = lookup_type_scope (name, scope);
14891
14892 if (decl
14893 && (DECL_CLASS_TEMPLATE_P (decl)
14894 /* If scope is ts_current we're defining a class, so ignore a
14895 template template parameter. */
14896 || (scope != ts_current
14897 && DECL_TEMPLATE_TEMPLATE_PARM_P (decl))))
14898 decl = DECL_TEMPLATE_RESULT (decl);
14899
14900 if (decl && TREE_CODE (decl) == TYPE_DECL)
14901 {
14902 /* Look for invalid nested type:
14903 class C {
14904 class C {};
14905 }; */
14906 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
14907 {
14908 error ("%qD has the same name as the class in which it is "
14909 "declared",
14910 decl);
14911 return error_mark_node;
14912 }
14913
14914 /* Two cases we need to consider when deciding if a class
14915 template is allowed as an elaborated type specifier:
14916 1. It is a self reference to its own class.
14917 2. It comes with a template header.
14918
14919 For example:
14920
14921 template <class T> class C {
14922 class C *c1; // DECL_SELF_REFERENCE_P is true
14923 class D;
14924 };
14925 template <class U> class C; // template_header_p is true
14926 template <class T> class C<T>::D {
14927 class C *c2; // DECL_SELF_REFERENCE_P is true
14928 }; */
14929
14930 t = check_elaborated_type_specifier (tag_code,
14931 decl,
14932 template_header_p
14933 | DECL_SELF_REFERENCE_P (decl));
14934 if (template_header_p && t && CLASS_TYPE_P (t)
14935 && (!CLASSTYPE_TEMPLATE_INFO (t)
14936 || (!PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))))
14937 {
14938 error ("%qT is not a template", t);
14939 inform (location_of (t), "previous declaration here");
14940 if (TYPE_CLASS_SCOPE_P (t)
14941 && CLASSTYPE_TEMPLATE_INFO (TYPE_CONTEXT (t)))
14942 inform (input_location,
14943 "perhaps you want to explicitly add %<%T::%>",
14944 TYPE_CONTEXT (t));
14945 t = error_mark_node;
14946 }
14947
14948 return t;
14949 }
14950 else if (decl && TREE_CODE (decl) == TREE_LIST)
14951 {
14952 error ("reference to %qD is ambiguous", name);
14953 print_candidates (decl);
14954 return error_mark_node;
14955 }
14956 else
14957 return NULL_TREE;
14958 }
14959
14960 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
14961 Define the tag as a forward-reference if it is not defined.
14962
14963 If a declaration is given, process it here, and report an error if
14964 multiple declarations are not identical.
14965
14966 SCOPE is TS_CURRENT when this is also a definition. Only look in
14967 the current frame for the name (since C++ allows new names in any
14968 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
14969 declaration. Only look beginning from the current scope outward up
14970 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
14971
14972 TEMPLATE_HEADER_P is true when this declaration is preceded by
14973 a set of template parameters. */
14974
14975 static tree
xref_tag_1(enum tag_types tag_code,tree name,tag_scope scope,bool template_header_p)14976 xref_tag_1 (enum tag_types tag_code, tree name,
14977 tag_scope scope, bool template_header_p)
14978 {
14979 enum tree_code code;
14980 tree context = NULL_TREE;
14981
14982 gcc_assert (identifier_p (name));
14983
14984 switch (tag_code)
14985 {
14986 case record_type:
14987 case class_type:
14988 code = RECORD_TYPE;
14989 break;
14990 case union_type:
14991 code = UNION_TYPE;
14992 break;
14993 case enum_type:
14994 code = ENUMERAL_TYPE;
14995 break;
14996 default:
14997 gcc_unreachable ();
14998 }
14999
15000 /* In case of anonymous name, xref_tag is only called to
15001 make type node and push name. Name lookup is not required. */
15002 tree t = NULL_TREE;
15003 if (scope != ts_lambda && !IDENTIFIER_ANON_P (name))
15004 t = lookup_and_check_tag (tag_code, name, scope, template_header_p);
15005
15006 if (t == error_mark_node)
15007 return error_mark_node;
15008
15009 if (scope != ts_current && t && current_class_type
15010 && template_class_depth (current_class_type)
15011 && template_header_p)
15012 {
15013 if (TREE_CODE (t) == TEMPLATE_TEMPLATE_PARM)
15014 return t;
15015
15016 /* Since SCOPE is not TS_CURRENT, we are not looking at a
15017 definition of this tag. Since, in addition, we are currently
15018 processing a (member) template declaration of a template
15019 class, we must be very careful; consider:
15020
15021 template <class X> struct S1
15022
15023 template <class U> struct S2
15024 {
15025 template <class V> friend struct S1;
15026 };
15027
15028 Here, the S2::S1 declaration should not be confused with the
15029 outer declaration. In particular, the inner version should
15030 have a template parameter of level 2, not level 1.
15031
15032 On the other hand, when presented with:
15033
15034 template <class T> struct S1
15035 {
15036 template <class U> struct S2 {};
15037 template <class U> friend struct S2;
15038 };
15039
15040 the friend must find S1::S2 eventually. We accomplish this
15041 by making sure that the new type we create to represent this
15042 declaration has the right TYPE_CONTEXT. */
15043 context = TYPE_CONTEXT (t);
15044 t = NULL_TREE;
15045 }
15046
15047 if (! t)
15048 {
15049 /* If no such tag is yet defined, create a forward-reference node
15050 and record it as the "definition".
15051 When a real declaration of this type is found,
15052 the forward-reference will be altered into a real type. */
15053 if (code == ENUMERAL_TYPE)
15054 {
15055 error ("use of enum %q#D without previous declaration", name);
15056 return error_mark_node;
15057 }
15058 else
15059 {
15060 t = make_class_type (code);
15061 TYPE_CONTEXT (t) = context;
15062 if (scope == ts_lambda)
15063 {
15064 /* Mark it as a lambda type. */
15065 CLASSTYPE_LAMBDA_EXPR (t) = error_mark_node;
15066 /* And push it into current scope. */
15067 scope = ts_current;
15068 }
15069 t = pushtag (name, t, scope);
15070 }
15071 }
15072 else
15073 {
15074 if (template_header_p && MAYBE_CLASS_TYPE_P (t))
15075 {
15076 /* Check that we aren't trying to overload a class with different
15077 constraints. */
15078 tree constr = NULL_TREE;
15079 if (current_template_parms)
15080 {
15081 tree reqs = TEMPLATE_PARMS_CONSTRAINTS (current_template_parms);
15082 constr = build_constraints (reqs, NULL_TREE);
15083 }
15084 if (!redeclare_class_template (t, current_template_parms, constr))
15085 return error_mark_node;
15086 }
15087 else if (!processing_template_decl
15088 && CLASS_TYPE_P (t)
15089 && CLASSTYPE_IS_TEMPLATE (t))
15090 {
15091 error ("redeclaration of %qT as a non-template", t);
15092 inform (location_of (t), "previous declaration %qD", t);
15093 return error_mark_node;
15094 }
15095
15096 if (scope != ts_within_enclosing_non_class && TYPE_HIDDEN_P (t))
15097 {
15098 /* This is no longer an invisible friend. Make it
15099 visible. */
15100 tree decl = TYPE_NAME (t);
15101
15102 DECL_ANTICIPATED (decl) = false;
15103 DECL_FRIEND_P (decl) = false;
15104
15105 if (TYPE_TEMPLATE_INFO (t))
15106 {
15107 tree tmpl = TYPE_TI_TEMPLATE (t);
15108 DECL_ANTICIPATED (tmpl) = false;
15109 DECL_FRIEND_P (tmpl) = false;
15110 }
15111 }
15112 }
15113
15114 return t;
15115 }
15116
15117 /* Wrapper for xref_tag_1. */
15118
15119 tree
xref_tag(enum tag_types tag_code,tree name,tag_scope scope,bool template_header_p)15120 xref_tag (enum tag_types tag_code, tree name,
15121 tag_scope scope, bool template_header_p)
15122 {
15123 tree ret;
15124 bool subtime;
15125 subtime = timevar_cond_start (TV_NAME_LOOKUP);
15126 ret = xref_tag_1 (tag_code, name, scope, template_header_p);
15127 timevar_cond_stop (TV_NAME_LOOKUP, subtime);
15128 return ret;
15129 }
15130
15131
15132 tree
xref_tag_from_type(tree old,tree id,tag_scope scope)15133 xref_tag_from_type (tree old, tree id, tag_scope scope)
15134 {
15135 enum tag_types tag_kind;
15136
15137 if (TREE_CODE (old) == RECORD_TYPE)
15138 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
15139 else
15140 tag_kind = union_type;
15141
15142 if (id == NULL_TREE)
15143 id = TYPE_IDENTIFIER (old);
15144
15145 return xref_tag (tag_kind, id, scope, false);
15146 }
15147
15148 /* Create the binfo hierarchy for REF with (possibly NULL) base list
15149 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
15150 access_* node, and the TREE_VALUE is the type of the base-class.
15151 Non-NULL TREE_TYPE indicates virtual inheritance. */
15152
15153 void
xref_basetypes(tree ref,tree base_list)15154 xref_basetypes (tree ref, tree base_list)
15155 {
15156 tree *basep;
15157 tree binfo, base_binfo;
15158 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
15159 unsigned max_bases = 0; /* Maximum direct bases. */
15160 unsigned max_dvbases = 0; /* Maximum direct virtual bases. */
15161 int i;
15162 tree default_access;
15163 tree igo_prev; /* Track Inheritance Graph Order. */
15164
15165 if (ref == error_mark_node)
15166 return;
15167
15168 /* The base of a derived class is private by default, all others are
15169 public. */
15170 default_access = (TREE_CODE (ref) == RECORD_TYPE
15171 && CLASSTYPE_DECLARED_CLASS (ref)
15172 ? access_private_node : access_public_node);
15173
15174 /* First, make sure that any templates in base-classes are
15175 instantiated. This ensures that if we call ourselves recursively
15176 we do not get confused about which classes are marked and which
15177 are not. */
15178 basep = &base_list;
15179 while (*basep)
15180 {
15181 tree basetype = TREE_VALUE (*basep);
15182
15183 /* The dependent_type_p call below should really be dependent_scope_p
15184 so that we give a hard error about using an incomplete type as a
15185 base, but we allow it with a pedwarn for backward
15186 compatibility. */
15187 if (processing_template_decl
15188 && CLASS_TYPE_P (basetype) && TYPE_BEING_DEFINED (basetype))
15189 cxx_incomplete_type_diagnostic (NULL_TREE, basetype, DK_PEDWARN);
15190 if (!dependent_type_p (basetype)
15191 && !complete_type_or_else (basetype, NULL))
15192 /* An incomplete type. Remove it from the list. */
15193 *basep = TREE_CHAIN (*basep);
15194 else
15195 {
15196 max_bases++;
15197 if (TREE_TYPE (*basep))
15198 max_dvbases++;
15199 if (CLASS_TYPE_P (basetype))
15200 max_vbases += vec_safe_length (CLASSTYPE_VBASECLASSES (basetype));
15201 basep = &TREE_CHAIN (*basep);
15202 }
15203 }
15204 max_vbases += max_dvbases;
15205
15206 TYPE_MARKED_P (ref) = 1;
15207
15208 /* The binfo slot should be empty, unless this is an (ill-formed)
15209 redefinition. */
15210 gcc_assert (!TYPE_BINFO (ref) || TYPE_SIZE (ref));
15211
15212 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
15213
15214 binfo = make_tree_binfo (max_bases);
15215
15216 TYPE_BINFO (ref) = binfo;
15217 BINFO_OFFSET (binfo) = size_zero_node;
15218 BINFO_TYPE (binfo) = ref;
15219
15220 /* Apply base-class info set up to the variants of this type. */
15221 fixup_type_variants (ref);
15222
15223 if (max_bases)
15224 {
15225 vec_alloc (BINFO_BASE_ACCESSES (binfo), max_bases);
15226 /* A C++98 POD cannot have base classes. */
15227 CLASSTYPE_NON_LAYOUT_POD_P (ref) = true;
15228
15229 if (TREE_CODE (ref) == UNION_TYPE)
15230 {
15231 error ("derived union %qT invalid", ref);
15232 return;
15233 }
15234 }
15235
15236 if (max_bases > 1)
15237 warning (OPT_Wmultiple_inheritance,
15238 "%qT defined with multiple direct bases", ref);
15239
15240 if (max_vbases)
15241 {
15242 /* An aggregate can't have virtual base classes. */
15243 CLASSTYPE_NON_AGGREGATE (ref) = true;
15244
15245 vec_alloc (CLASSTYPE_VBASECLASSES (ref), max_vbases);
15246
15247 if (max_dvbases)
15248 warning (OPT_Wvirtual_inheritance,
15249 "%qT defined with direct virtual base", ref);
15250 }
15251
15252 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
15253 {
15254 tree access = TREE_PURPOSE (base_list);
15255 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
15256 tree basetype = TREE_VALUE (base_list);
15257
15258 if (access == access_default_node)
15259 access = default_access;
15260
15261 /* Before C++17, an aggregate cannot have base classes. In C++17, an
15262 aggregate can't have virtual, private, or protected base classes. */
15263 if (cxx_dialect < cxx17
15264 || access != access_public_node
15265 || via_virtual)
15266 CLASSTYPE_NON_AGGREGATE (ref) = true;
15267
15268 if (PACK_EXPANSION_P (basetype))
15269 basetype = PACK_EXPANSION_PATTERN (basetype);
15270 if (TREE_CODE (basetype) == TYPE_DECL)
15271 basetype = TREE_TYPE (basetype);
15272 if (!MAYBE_CLASS_TYPE_P (basetype) || TREE_CODE (basetype) == UNION_TYPE)
15273 {
15274 error ("base type %qT fails to be a struct or class type",
15275 basetype);
15276 goto dropped_base;
15277 }
15278
15279 base_binfo = NULL_TREE;
15280 if (CLASS_TYPE_P (basetype) && !dependent_scope_p (basetype))
15281 {
15282 base_binfo = TYPE_BINFO (basetype);
15283 /* The original basetype could have been a typedef'd type. */
15284 basetype = BINFO_TYPE (base_binfo);
15285
15286 /* Inherit flags from the base. */
15287 TYPE_HAS_NEW_OPERATOR (ref)
15288 |= TYPE_HAS_NEW_OPERATOR (basetype);
15289 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
15290 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
15291 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
15292 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
15293 CLASSTYPE_DIAMOND_SHAPED_P (ref)
15294 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
15295 CLASSTYPE_REPEATED_BASE_P (ref)
15296 |= CLASSTYPE_REPEATED_BASE_P (basetype);
15297 }
15298
15299 /* We must do this test after we've seen through a typedef
15300 type. */
15301 if (TYPE_MARKED_P (basetype))
15302 {
15303 if (basetype == ref)
15304 error ("recursive type %qT undefined", basetype);
15305 else
15306 error ("duplicate base type %qT invalid", basetype);
15307 goto dropped_base;
15308 }
15309
15310 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
15311 /* Regenerate the pack expansion for the bases. */
15312 basetype = make_pack_expansion (basetype);
15313
15314 TYPE_MARKED_P (basetype) = 1;
15315
15316 base_binfo = copy_binfo (base_binfo, basetype, ref,
15317 &igo_prev, via_virtual);
15318 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
15319 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
15320
15321 BINFO_BASE_APPEND (binfo, base_binfo);
15322 BINFO_BASE_ACCESS_APPEND (binfo, access);
15323 continue;
15324
15325 dropped_base:
15326 /* Update max_vbases to reflect the reality that we are dropping
15327 this base: if it reaches zero we want to undo the vec_alloc
15328 above to avoid inconsistencies during error-recovery: eg, in
15329 build_special_member_call, CLASSTYPE_VBASECLASSES non null
15330 and vtt null (c++/27952). */
15331 if (via_virtual)
15332 max_vbases--;
15333 if (CLASS_TYPE_P (basetype))
15334 max_vbases
15335 -= vec_safe_length (CLASSTYPE_VBASECLASSES (basetype));
15336 }
15337
15338 if (CLASSTYPE_VBASECLASSES (ref)
15339 && max_vbases == 0)
15340 vec_free (CLASSTYPE_VBASECLASSES (ref));
15341
15342 if (vec_safe_length (CLASSTYPE_VBASECLASSES (ref)) < max_vbases)
15343 /* If we didn't get max_vbases vbases, we must have shared at
15344 least one of them, and are therefore diamond shaped. */
15345 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
15346
15347 /* Unmark all the types. */
15348 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
15349 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
15350 TYPE_MARKED_P (ref) = 0;
15351
15352 /* Now see if we have a repeated base type. */
15353 if (!CLASSTYPE_REPEATED_BASE_P (ref))
15354 {
15355 for (base_binfo = binfo; base_binfo;
15356 base_binfo = TREE_CHAIN (base_binfo))
15357 {
15358 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
15359 {
15360 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
15361 break;
15362 }
15363 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
15364 }
15365 for (base_binfo = binfo; base_binfo;
15366 base_binfo = TREE_CHAIN (base_binfo))
15367 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
15368 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
15369 else
15370 break;
15371 }
15372 }
15373
15374
15375 /* Copies the enum-related properties from type SRC to type DST.
15376 Used with the underlying type of an enum and the enum itself. */
15377 static void
copy_type_enum(tree dst,tree src)15378 copy_type_enum (tree dst, tree src)
15379 {
15380 tree t;
15381 for (t = dst; t; t = TYPE_NEXT_VARIANT (t))
15382 {
15383 TYPE_MIN_VALUE (t) = TYPE_MIN_VALUE (src);
15384 TYPE_MAX_VALUE (t) = TYPE_MAX_VALUE (src);
15385 TYPE_SIZE (t) = TYPE_SIZE (src);
15386 TYPE_SIZE_UNIT (t) = TYPE_SIZE_UNIT (src);
15387 SET_TYPE_MODE (dst, TYPE_MODE (src));
15388 TYPE_PRECISION (t) = TYPE_PRECISION (src);
15389 unsigned valign = TYPE_ALIGN (src);
15390 if (TYPE_USER_ALIGN (t))
15391 valign = MAX (valign, TYPE_ALIGN (t));
15392 else
15393 TYPE_USER_ALIGN (t) = TYPE_USER_ALIGN (src);
15394 SET_TYPE_ALIGN (t, valign);
15395 TYPE_UNSIGNED (t) = TYPE_UNSIGNED (src);
15396 }
15397 }
15398
15399 /* Begin compiling the definition of an enumeration type.
15400 NAME is its name,
15401
15402 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
15403
15404 UNDERLYING_TYPE is the type that will be used as the storage for
15405 the enumeration type. This should be NULL_TREE if no storage type
15406 was specified.
15407
15408 ATTRIBUTES are any attributes specified after the enum-key.
15409
15410 SCOPED_ENUM_P is true if this is a scoped enumeration type.
15411
15412 if IS_NEW is not NULL, gets TRUE iff a new type is created.
15413
15414 Returns the type object, as yet incomplete.
15415 Also records info about it so that build_enumerator
15416 may be used to declare the individual values as they are read. */
15417
15418 tree
start_enum(tree name,tree enumtype,tree underlying_type,tree attributes,bool scoped_enum_p,bool * is_new)15419 start_enum (tree name, tree enumtype, tree underlying_type,
15420 tree attributes, bool scoped_enum_p, bool *is_new)
15421 {
15422 tree prevtype = NULL_TREE;
15423 gcc_assert (identifier_p (name));
15424
15425 if (is_new)
15426 *is_new = false;
15427 /* [C++0x dcl.enum]p5:
15428
15429 If not explicitly specified, the underlying type of a scoped
15430 enumeration type is int. */
15431 if (!underlying_type && scoped_enum_p)
15432 underlying_type = integer_type_node;
15433
15434 if (underlying_type)
15435 underlying_type = cv_unqualified (underlying_type);
15436
15437 /* If this is the real definition for a previous forward reference,
15438 fill in the contents in the same object that used to be the
15439 forward reference. */
15440 if (!enumtype)
15441 enumtype = lookup_and_check_tag (enum_type, name,
15442 /*tag_scope=*/ts_current,
15443 /*template_header_p=*/false);
15444
15445 /* In case of a template_decl, the only check that should be deferred
15446 to instantiation time is the comparison of underlying types. */
15447 if (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE)
15448 {
15449 if (scoped_enum_p != SCOPED_ENUM_P (enumtype))
15450 {
15451 error_at (input_location, "scoped/unscoped mismatch "
15452 "in enum %q#T", enumtype);
15453 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
15454 "previous definition here");
15455 enumtype = error_mark_node;
15456 }
15457 else if (ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) != !! underlying_type)
15458 {
15459 error_at (input_location, "underlying type mismatch "
15460 "in enum %q#T", enumtype);
15461 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
15462 "previous definition here");
15463 enumtype = error_mark_node;
15464 }
15465 else if (underlying_type && ENUM_UNDERLYING_TYPE (enumtype)
15466 && !same_type_p (underlying_type,
15467 ENUM_UNDERLYING_TYPE (enumtype)))
15468 {
15469 error_at (input_location, "different underlying type "
15470 "in enum %q#T", enumtype);
15471 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
15472 "previous definition here");
15473 underlying_type = NULL_TREE;
15474 }
15475 }
15476
15477 if (!enumtype || TREE_CODE (enumtype) != ENUMERAL_TYPE
15478 || processing_template_decl)
15479 {
15480 /* In case of error, make a dummy enum to allow parsing to
15481 continue. */
15482 if (enumtype == error_mark_node)
15483 {
15484 name = make_anon_name ();
15485 enumtype = NULL_TREE;
15486 }
15487
15488 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
15489 of an opaque enum, or an opaque enum of an already defined
15490 enumeration (C++11).
15491 In any other case, it'll be NULL_TREE. */
15492 if (!enumtype)
15493 {
15494 if (is_new)
15495 *is_new = true;
15496 }
15497 prevtype = enumtype;
15498
15499 /* Do not push the decl more than once. */
15500 if (!enumtype
15501 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
15502 {
15503 enumtype = cxx_make_type (ENUMERAL_TYPE);
15504 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
15505
15506 /* std::byte aliases anything. */
15507 if (enumtype != error_mark_node
15508 && TYPE_CONTEXT (enumtype) == std_node
15509 && !strcmp ("byte", TYPE_NAME_STRING (enumtype)))
15510 TYPE_ALIAS_SET (enumtype) = 0;
15511 }
15512 else
15513 enumtype = xref_tag (enum_type, name, /*tag_scope=*/ts_current,
15514 false);
15515
15516 if (enumtype == error_mark_node)
15517 return error_mark_node;
15518
15519 /* The enum is considered opaque until the opening '{' of the
15520 enumerator list. */
15521 SET_OPAQUE_ENUM_P (enumtype, true);
15522 ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) = !! underlying_type;
15523 }
15524
15525 SET_SCOPED_ENUM_P (enumtype, scoped_enum_p);
15526
15527 cplus_decl_attributes (&enumtype, attributes, (int)ATTR_FLAG_TYPE_IN_PLACE);
15528
15529 if (underlying_type)
15530 {
15531 if (ENUM_UNDERLYING_TYPE (enumtype))
15532 /* We already checked that it matches, don't change it to a different
15533 typedef variant. */;
15534 else if (CP_INTEGRAL_TYPE_P (underlying_type))
15535 {
15536 copy_type_enum (enumtype, underlying_type);
15537 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
15538 }
15539 else if (dependent_type_p (underlying_type))
15540 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
15541 else
15542 error ("underlying type %qT of %qT must be an integral type",
15543 underlying_type, enumtype);
15544 }
15545
15546 /* If into a template class, the returned enum is always the first
15547 declaration (opaque or not) seen. This way all the references to
15548 this type will be to the same declaration. The following ones are used
15549 only to check for definition errors. */
15550 if (prevtype && processing_template_decl)
15551 return prevtype;
15552 else
15553 return enumtype;
15554 }
15555
15556 /* After processing and defining all the values of an enumeration type,
15557 install their decls in the enumeration type.
15558 ENUMTYPE is the type object. */
15559
15560 void
finish_enum_value_list(tree enumtype)15561 finish_enum_value_list (tree enumtype)
15562 {
15563 tree values;
15564 tree underlying_type;
15565 tree decl;
15566 tree value;
15567 tree minnode, maxnode;
15568 tree t;
15569
15570 bool fixed_underlying_type_p
15571 = ENUM_UNDERLYING_TYPE (enumtype) != NULL_TREE;
15572
15573 /* We built up the VALUES in reverse order. */
15574 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
15575
15576 /* For an enum defined in a template, just set the type of the values;
15577 all further processing is postponed until the template is
15578 instantiated. We need to set the type so that tsubst of a CONST_DECL
15579 works. */
15580 if (processing_template_decl)
15581 {
15582 for (values = TYPE_VALUES (enumtype);
15583 values;
15584 values = TREE_CHAIN (values))
15585 TREE_TYPE (TREE_VALUE (values)) = enumtype;
15586 return;
15587 }
15588
15589 /* Determine the minimum and maximum values of the enumerators. */
15590 if (TYPE_VALUES (enumtype))
15591 {
15592 minnode = maxnode = NULL_TREE;
15593
15594 for (values = TYPE_VALUES (enumtype);
15595 values;
15596 values = TREE_CHAIN (values))
15597 {
15598 decl = TREE_VALUE (values);
15599
15600 /* [dcl.enum]: Following the closing brace of an enum-specifier,
15601 each enumerator has the type of its enumeration. Prior to the
15602 closing brace, the type of each enumerator is the type of its
15603 initializing value. */
15604 TREE_TYPE (decl) = enumtype;
15605
15606 /* Update the minimum and maximum values, if appropriate. */
15607 value = DECL_INITIAL (decl);
15608 if (value == error_mark_node)
15609 value = integer_zero_node;
15610 /* Figure out what the minimum and maximum values of the
15611 enumerators are. */
15612 if (!minnode)
15613 minnode = maxnode = value;
15614 else if (tree_int_cst_lt (maxnode, value))
15615 maxnode = value;
15616 else if (tree_int_cst_lt (value, minnode))
15617 minnode = value;
15618 }
15619 }
15620 else
15621 /* [dcl.enum]
15622
15623 If the enumerator-list is empty, the underlying type is as if
15624 the enumeration had a single enumerator with value 0. */
15625 minnode = maxnode = integer_zero_node;
15626
15627 if (!fixed_underlying_type_p)
15628 {
15629 /* Compute the number of bits require to represent all values of the
15630 enumeration. We must do this before the type of MINNODE and
15631 MAXNODE are transformed, since tree_int_cst_min_precision relies
15632 on the TREE_TYPE of the value it is passed. */
15633 signop sgn = tree_int_cst_sgn (minnode) >= 0 ? UNSIGNED : SIGNED;
15634 int lowprec = tree_int_cst_min_precision (minnode, sgn);
15635 int highprec = tree_int_cst_min_precision (maxnode, sgn);
15636 int precision = MAX (lowprec, highprec);
15637 unsigned int itk;
15638 bool use_short_enum;
15639
15640 /* Determine the underlying type of the enumeration.
15641
15642 [dcl.enum]
15643
15644 The underlying type of an enumeration is an integral type that
15645 can represent all the enumerator values defined in the
15646 enumeration. It is implementation-defined which integral type is
15647 used as the underlying type for an enumeration except that the
15648 underlying type shall not be larger than int unless the value of
15649 an enumerator cannot fit in an int or unsigned int.
15650
15651 We use "int" or an "unsigned int" as the underlying type, even if
15652 a smaller integral type would work, unless the user has
15653 explicitly requested that we use the smallest possible type. The
15654 user can request that for all enumerations with a command line
15655 flag, or for just one enumeration with an attribute. */
15656
15657 use_short_enum = flag_short_enums
15658 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
15659
15660 /* If the precision of the type was specified with an attribute and it
15661 was too small, give an error. Otherwise, use it. */
15662 if (TYPE_PRECISION (enumtype))
15663 {
15664 if (precision > TYPE_PRECISION (enumtype))
15665 error ("specified mode too small for enumerated values");
15666 else
15667 {
15668 use_short_enum = true;
15669 precision = TYPE_PRECISION (enumtype);
15670 }
15671 }
15672
15673 for (itk = (use_short_enum ? itk_char : itk_int);
15674 itk != itk_none;
15675 itk++)
15676 {
15677 underlying_type = integer_types[itk];
15678 if (underlying_type != NULL_TREE
15679 && TYPE_PRECISION (underlying_type) >= precision
15680 && TYPE_SIGN (underlying_type) == sgn)
15681 break;
15682 }
15683 if (itk == itk_none)
15684 {
15685 /* DR 377
15686
15687 IF no integral type can represent all the enumerator values, the
15688 enumeration is ill-formed. */
15689 error ("no integral type can represent all of the enumerator values "
15690 "for %qT", enumtype);
15691 precision = TYPE_PRECISION (long_long_integer_type_node);
15692 underlying_type = integer_types[itk_unsigned_long_long];
15693 }
15694
15695 /* [dcl.enum]
15696
15697 The value of sizeof() applied to an enumeration type, an object
15698 of an enumeration type, or an enumerator, is the value of sizeof()
15699 applied to the underlying type. */
15700 copy_type_enum (enumtype, underlying_type);
15701
15702 /* Compute the minimum and maximum values for the type.
15703
15704 [dcl.enum]
15705
15706 For an enumeration where emin is the smallest enumerator and emax
15707 is the largest, the values of the enumeration are the values of the
15708 underlying type in the range bmin to bmax, where bmin and bmax are,
15709 respectively, the smallest and largest values of the smallest bit-
15710 field that can store emin and emax. */
15711
15712 /* The middle-end currently assumes that types with TYPE_PRECISION
15713 narrower than their underlying type are suitably zero or sign
15714 extended to fill their mode. Similarly, it assumes that the front
15715 end assures that a value of a particular type must be within
15716 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
15717
15718 We used to set these fields based on bmin and bmax, but that led
15719 to invalid assumptions like optimizing away bounds checking. So
15720 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
15721 TYPE_MAX_VALUE to the values for the mode above and only restrict
15722 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
15723 ENUM_UNDERLYING_TYPE (enumtype)
15724 = build_distinct_type_copy (underlying_type);
15725 TYPE_PRECISION (ENUM_UNDERLYING_TYPE (enumtype)) = precision;
15726 set_min_and_max_values_for_integral_type
15727 (ENUM_UNDERLYING_TYPE (enumtype), precision, sgn);
15728
15729 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
15730 if (flag_strict_enums)
15731 set_min_and_max_values_for_integral_type (enumtype, precision, sgn);
15732 }
15733 else
15734 underlying_type = ENUM_UNDERLYING_TYPE (enumtype);
15735
15736 /* Convert each of the enumerators to the type of the underlying
15737 type of the enumeration. */
15738 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
15739 {
15740 decl = TREE_VALUE (values);
15741 iloc_sentinel ils (DECL_SOURCE_LOCATION (decl));
15742 if (fixed_underlying_type_p)
15743 /* If the enumeration type has a fixed underlying type, we
15744 already checked all of the enumerator values. */
15745 value = DECL_INITIAL (decl);
15746 else
15747 value = perform_implicit_conversion (underlying_type,
15748 DECL_INITIAL (decl),
15749 tf_warning_or_error);
15750 /* Do not clobber shared ints. */
15751 if (value != error_mark_node)
15752 {
15753 value = copy_node (value);
15754
15755 TREE_TYPE (value) = enumtype;
15756 }
15757 DECL_INITIAL (decl) = value;
15758 }
15759
15760 /* Fix up all variant types of this enum type. */
15761 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
15762 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
15763
15764 if (at_class_scope_p ()
15765 && COMPLETE_TYPE_P (current_class_type)
15766 && UNSCOPED_ENUM_P (enumtype))
15767 {
15768 insert_late_enum_def_bindings (current_class_type, enumtype);
15769 /* TYPE_FIELDS needs fixup. */
15770 fixup_type_variants (current_class_type);
15771 }
15772
15773 /* Finish debugging output for this type. */
15774 rest_of_type_compilation (enumtype, namespace_bindings_p ());
15775
15776 /* Each enumerator now has the type of its enumeration. Clear the cache
15777 so that this change in types doesn't confuse us later on. */
15778 clear_cv_and_fold_caches ();
15779 }
15780
15781 /* Finishes the enum type. This is called only the first time an
15782 enumeration is seen, be it opaque or odinary.
15783 ENUMTYPE is the type object. */
15784
15785 void
finish_enum(tree enumtype)15786 finish_enum (tree enumtype)
15787 {
15788 if (processing_template_decl)
15789 {
15790 if (at_function_scope_p ())
15791 add_stmt (build_min (TAG_DEFN, enumtype));
15792 return;
15793 }
15794
15795 /* If this is a forward declaration, there should not be any variants,
15796 though we can get a variant in the middle of an enum-specifier with
15797 wacky code like 'enum E { e = sizeof(const E*) };' */
15798 gcc_assert (enumtype == TYPE_MAIN_VARIANT (enumtype)
15799 && (TYPE_VALUES (enumtype)
15800 || !TYPE_NEXT_VARIANT (enumtype)));
15801 }
15802
15803 /* Build and install a CONST_DECL for an enumeration constant of the
15804 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
15805 Apply ATTRIBUTES if available. LOC is the location of NAME.
15806 Assignment of sequential values by default is handled here. */
15807
15808 void
build_enumerator(tree name,tree value,tree enumtype,tree attributes,location_t loc)15809 build_enumerator (tree name, tree value, tree enumtype, tree attributes,
15810 location_t loc)
15811 {
15812 tree decl;
15813 tree context;
15814 tree type;
15815
15816 /* scalar_constant_value will pull out this expression, so make sure
15817 it's folded as appropriate. */
15818 if (processing_template_decl)
15819 value = fold_non_dependent_expr (value);
15820
15821 /* If the VALUE was erroneous, pretend it wasn't there; that will
15822 result in the enum being assigned the next value in sequence. */
15823 if (value == error_mark_node)
15824 value = NULL_TREE;
15825
15826 /* Remove no-op casts from the value. */
15827 if (value)
15828 STRIP_TYPE_NOPS (value);
15829
15830 if (! processing_template_decl)
15831 {
15832 /* Validate and default VALUE. */
15833 if (value != NULL_TREE)
15834 {
15835 if (!ENUM_UNDERLYING_TYPE (enumtype))
15836 {
15837 tree tmp_value = build_expr_type_conversion (WANT_INT | WANT_ENUM,
15838 value, true);
15839 if (tmp_value)
15840 value = tmp_value;
15841 }
15842 else if (! INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P
15843 (TREE_TYPE (value)))
15844 value = perform_implicit_conversion_flags
15845 (ENUM_UNDERLYING_TYPE (enumtype), value, tf_warning_or_error,
15846 LOOKUP_IMPLICIT | LOOKUP_NO_NARROWING);
15847
15848 if (value == error_mark_node)
15849 value = NULL_TREE;
15850
15851 if (value != NULL_TREE)
15852 {
15853 if (! INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P
15854 (TREE_TYPE (value)))
15855 {
15856 error_at (cp_expr_loc_or_input_loc (value),
15857 "enumerator value for %qD must have integral or "
15858 "unscoped enumeration type", name);
15859 value = NULL_TREE;
15860 }
15861 else
15862 {
15863 value = cxx_constant_value (value);
15864
15865 if (TREE_CODE (value) != INTEGER_CST)
15866 {
15867 error ("enumerator value for %qD is not an integer "
15868 "constant", name);
15869 value = NULL_TREE;
15870 }
15871 }
15872 }
15873 }
15874
15875 /* Default based on previous value. */
15876 if (value == NULL_TREE)
15877 {
15878 if (TYPE_VALUES (enumtype))
15879 {
15880 tree prev_value;
15881
15882 /* C++03 7.2/4: If no initializer is specified for the first
15883 enumerator, the type is an unspecified integral
15884 type. Otherwise the type is the same as the type of the
15885 initializing value of the preceding enumerator unless the
15886 incremented value is not representable in that type, in
15887 which case the type is an unspecified integral type
15888 sufficient to contain the incremented value. */
15889 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
15890 if (error_operand_p (prev_value))
15891 value = error_mark_node;
15892 else
15893 {
15894 wi::overflow_type overflowed;
15895 tree type = TREE_TYPE (prev_value);
15896 signop sgn = TYPE_SIGN (type);
15897 widest_int wi = wi::add (wi::to_widest (prev_value), 1, sgn,
15898 &overflowed);
15899 if (!overflowed)
15900 {
15901 bool pos = !wi::neg_p (wi, sgn);
15902 if (!wi::fits_to_tree_p (wi, type))
15903 {
15904 unsigned int itk;
15905 for (itk = itk_int; itk != itk_none; itk++)
15906 {
15907 type = integer_types[itk];
15908 if (type != NULL_TREE
15909 && (pos || !TYPE_UNSIGNED (type))
15910 && wi::fits_to_tree_p (wi, type))
15911 break;
15912 }
15913 if (type && cxx_dialect < cxx11
15914 && itk > itk_unsigned_long)
15915 pedwarn (input_location, OPT_Wlong_long,
15916 pos ? G_("\
15917 incremented enumerator value is too large for %<unsigned long%>") : G_("\
15918 incremented enumerator value is too large for %<long%>"));
15919 }
15920 if (type == NULL_TREE)
15921 overflowed = wi::OVF_UNKNOWN;
15922 else
15923 value = wide_int_to_tree (type, wi);
15924 }
15925
15926 if (overflowed)
15927 {
15928 error ("overflow in enumeration values at %qD", name);
15929 value = error_mark_node;
15930 }
15931 }
15932 }
15933 else
15934 value = integer_zero_node;
15935 }
15936
15937 /* Remove no-op casts from the value. */
15938 STRIP_TYPE_NOPS (value);
15939
15940 /* If the underlying type of the enum is fixed, check whether
15941 the enumerator values fits in the underlying type. If it
15942 does not fit, the program is ill-formed [C++0x dcl.enum]. */
15943 if (ENUM_UNDERLYING_TYPE (enumtype)
15944 && value
15945 && TREE_CODE (value) == INTEGER_CST)
15946 {
15947 if (!int_fits_type_p (value, ENUM_UNDERLYING_TYPE (enumtype)))
15948 error ("enumerator value %qE is outside the range of underlying "
15949 "type %qT", value, ENUM_UNDERLYING_TYPE (enumtype));
15950
15951 /* Convert the value to the appropriate type. */
15952 value = fold_convert (ENUM_UNDERLYING_TYPE (enumtype), value);
15953 }
15954 }
15955
15956 /* C++ associates enums with global, function, or class declarations. */
15957 context = current_scope ();
15958
15959 /* Build the actual enumeration constant. Note that the enumeration
15960 constants have the underlying type of the enum (if it is fixed)
15961 or the type of their initializer (if the underlying type of the
15962 enum is not fixed):
15963
15964 [ C++0x dcl.enum ]
15965
15966 If the underlying type is fixed, the type of each enumerator
15967 prior to the closing brace is the underlying type; if the
15968 initializing value of an enumerator cannot be represented by
15969 the underlying type, the program is ill-formed. If the
15970 underlying type is not fixed, the type of each enumerator is
15971 the type of its initializing value.
15972
15973 If the underlying type is not fixed, it will be computed by
15974 finish_enum and we will reset the type of this enumerator. Of
15975 course, if we're processing a template, there may be no value. */
15976 type = value ? TREE_TYPE (value) : NULL_TREE;
15977
15978 decl = build_decl (loc, CONST_DECL, name, type);
15979
15980 DECL_CONTEXT (decl) = enumtype;
15981 TREE_CONSTANT (decl) = 1;
15982 TREE_READONLY (decl) = 1;
15983 DECL_INITIAL (decl) = value;
15984
15985 if (attributes)
15986 cplus_decl_attributes (&decl, attributes, 0);
15987
15988 if (context && context == current_class_type && !SCOPED_ENUM_P (enumtype))
15989 {
15990 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
15991 on the TYPE_FIELDS list for `S'. (That's so that you can say
15992 things like `S::i' later.) */
15993
15994 /* The enumerator may be getting declared outside of its enclosing
15995 class, like so:
15996
15997 class S { public: enum E : int; }; enum S::E : int { i = 7; };
15998
15999 For which case we need to make sure that the access of `S::i'
16000 matches the access of `S::E'. */
16001 tree saved_cas = current_access_specifier;
16002 if (TREE_PRIVATE (TYPE_NAME (enumtype)))
16003 current_access_specifier = access_private_node;
16004 else if (TREE_PROTECTED (TYPE_NAME (enumtype)))
16005 current_access_specifier = access_protected_node;
16006 else
16007 current_access_specifier = access_public_node;
16008
16009 finish_member_declaration (decl);
16010
16011 current_access_specifier = saved_cas;
16012 }
16013 else
16014 pushdecl (decl);
16015
16016 /* Add this enumeration constant to the list for this type. */
16017 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
16018 }
16019
16020 /* Look for an enumerator with the given NAME within the enumeration
16021 type ENUMTYPE. This routine is used primarily for qualified name
16022 lookup into an enumerator in C++0x, e.g.,
16023
16024 enum class Color { Red, Green, Blue };
16025
16026 Color color = Color::Red;
16027
16028 Returns the value corresponding to the enumerator, or
16029 NULL_TREE if no such enumerator was found. */
16030 tree
lookup_enumerator(tree enumtype,tree name)16031 lookup_enumerator (tree enumtype, tree name)
16032 {
16033 tree e;
16034 gcc_assert (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE);
16035
16036 e = purpose_member (name, TYPE_VALUES (enumtype));
16037 return e? TREE_VALUE (e) : NULL_TREE;
16038 }
16039
16040 /* Implement LANG_HOOKS_SIMULATE_ENUM_DECL. */
16041
16042 tree
cxx_simulate_enum_decl(location_t loc,const char * name,vec<string_int_pair> values)16043 cxx_simulate_enum_decl (location_t loc, const char *name,
16044 vec<string_int_pair> values)
16045 {
16046 location_t saved_loc = input_location;
16047 input_location = loc;
16048
16049 tree enumtype = start_enum (get_identifier (name), NULL_TREE, NULL_TREE,
16050 NULL_TREE, false, NULL);
16051 if (!OPAQUE_ENUM_P (enumtype))
16052 {
16053 error_at (loc, "multiple definition of %q#T", enumtype);
16054 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
16055 "previous definition here");
16056 return enumtype;
16057 }
16058 SET_OPAQUE_ENUM_P (enumtype, false);
16059 DECL_SOURCE_LOCATION (TYPE_NAME (enumtype)) = loc;
16060
16061 string_int_pair *value;
16062 unsigned int i;
16063 FOR_EACH_VEC_ELT (values, i, value)
16064 build_enumerator (get_identifier (value->first),
16065 build_int_cst (integer_type_node, value->second),
16066 enumtype, NULL_TREE, loc);
16067
16068 finish_enum_value_list (enumtype);
16069 finish_enum (enumtype);
16070
16071 input_location = saved_loc;
16072 return enumtype;
16073 }
16074
16075 /* We're defining DECL. Make sure that its type is OK. */
16076
16077 static void
check_function_type(tree decl,tree current_function_parms)16078 check_function_type (tree decl, tree current_function_parms)
16079 {
16080 tree fntype = TREE_TYPE (decl);
16081 tree return_type = complete_type (TREE_TYPE (fntype));
16082
16083 /* In a function definition, arg types must be complete. */
16084 require_complete_types_for_parms (current_function_parms);
16085
16086 if (dependent_type_p (return_type)
16087 || type_uses_auto (return_type))
16088 return;
16089 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
16090 {
16091 tree args = TYPE_ARG_TYPES (fntype);
16092
16093 error ("return type %q#T is incomplete", return_type);
16094
16095 /* Make it return void instead. */
16096 if (TREE_CODE (fntype) == METHOD_TYPE)
16097 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
16098 void_type_node,
16099 TREE_CHAIN (args));
16100 else
16101 fntype = build_function_type (void_type_node, args);
16102 fntype = (cp_build_type_attribute_variant
16103 (fntype, TYPE_ATTRIBUTES (TREE_TYPE (decl))));
16104 fntype = cxx_copy_lang_qualifiers (fntype, TREE_TYPE (decl));
16105 TREE_TYPE (decl) = fntype;
16106 }
16107 else
16108 {
16109 abstract_virtuals_error (decl, TREE_TYPE (fntype));
16110 maybe_warn_parm_abi (TREE_TYPE (fntype),
16111 DECL_SOURCE_LOCATION (decl));
16112 }
16113 }
16114
16115 /* True iff FN is an implicitly-defined default constructor. */
16116
16117 static bool
implicit_default_ctor_p(tree fn)16118 implicit_default_ctor_p (tree fn)
16119 {
16120 return (DECL_CONSTRUCTOR_P (fn)
16121 && !user_provided_p (fn)
16122 && sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (fn)));
16123 }
16124
16125 /* Clobber the contents of *this to let the back end know that the object
16126 storage is dead when we enter the constructor or leave the destructor. */
16127
16128 static tree
build_clobber_this()16129 build_clobber_this ()
16130 {
16131 /* Clobbering an empty base is pointless, and harmful if its one byte
16132 TYPE_SIZE overlays real data. */
16133 if (is_empty_class (current_class_type))
16134 return void_node;
16135
16136 /* If we have virtual bases, clobber the whole object, but only if we're in
16137 charge. If we don't have virtual bases, clobber the as-base type so we
16138 don't mess with tail padding. */
16139 bool vbases = CLASSTYPE_VBASECLASSES (current_class_type);
16140
16141 tree ctype = current_class_type;
16142 if (!vbases)
16143 ctype = CLASSTYPE_AS_BASE (ctype);
16144
16145 tree clobber = build_clobber (ctype);
16146
16147 tree thisref = current_class_ref;
16148 if (ctype != current_class_type)
16149 {
16150 thisref = build_nop (build_reference_type (ctype), current_class_ptr);
16151 thisref = convert_from_reference (thisref);
16152 }
16153
16154 tree exprstmt = build2 (MODIFY_EXPR, void_type_node, thisref, clobber);
16155 if (vbases)
16156 exprstmt = build_if_in_charge (exprstmt);
16157
16158 return exprstmt;
16159 }
16160
16161 /* Create the FUNCTION_DECL for a function definition.
16162 DECLSPECS and DECLARATOR are the parts of the declaration;
16163 they describe the function's name and the type it returns,
16164 but twisted together in a fashion that parallels the syntax of C.
16165
16166 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
16167 DECLARATOR is really the DECL for the function we are about to
16168 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
16169 indicating that the function is an inline defined in-class.
16170
16171 This function creates a binding context for the function body
16172 as well as setting up the FUNCTION_DECL in current_function_decl.
16173
16174 For C++, we must first check whether that datum makes any sense.
16175 For example, "class A local_a(1,2);" means that variable local_a
16176 is an aggregate of type A, which should have a constructor
16177 applied to it with the argument list [1, 2].
16178
16179 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
16180 or may be a BLOCK if the function has been defined previously
16181 in this translation unit. On exit, DECL_INITIAL (decl1) will be
16182 error_mark_node if the function has never been defined, or
16183 a BLOCK if the function has been defined somewhere. */
16184
16185 bool
start_preparsed_function(tree decl1,tree attrs,int flags)16186 start_preparsed_function (tree decl1, tree attrs, int flags)
16187 {
16188 tree ctype = NULL_TREE;
16189 tree fntype;
16190 tree restype;
16191 int doing_friend = 0;
16192 cp_binding_level *bl;
16193 tree current_function_parms;
16194 struct c_fileinfo *finfo
16195 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
16196 bool honor_interface;
16197
16198 /* Sanity check. */
16199 gcc_assert (VOID_TYPE_P (TREE_VALUE (void_list_node)));
16200 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
16201
16202 fntype = TREE_TYPE (decl1);
16203 if (TREE_CODE (fntype) == METHOD_TYPE)
16204 ctype = TYPE_METHOD_BASETYPE (fntype);
16205
16206 /* ISO C++ 11.4/5. A friend function defined in a class is in
16207 the (lexical) scope of the class in which it is defined. */
16208 if (!ctype && DECL_FRIEND_P (decl1))
16209 {
16210 ctype = DECL_FRIEND_CONTEXT (decl1);
16211
16212 /* CTYPE could be null here if we're dealing with a template;
16213 for example, `inline friend float foo()' inside a template
16214 will have no CTYPE set. */
16215 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
16216 ctype = NULL_TREE;
16217 else
16218 doing_friend = 1;
16219 }
16220
16221 if (DECL_DECLARED_INLINE_P (decl1)
16222 && lookup_attribute ("noinline", attrs))
16223 warning_at (DECL_SOURCE_LOCATION (decl1), 0,
16224 "inline function %qD given attribute %qs", decl1, "noinline");
16225
16226 /* Handle gnu_inline attribute. */
16227 if (GNU_INLINE_P (decl1))
16228 {
16229 DECL_EXTERNAL (decl1) = 1;
16230 DECL_NOT_REALLY_EXTERN (decl1) = 0;
16231 DECL_INTERFACE_KNOWN (decl1) = 1;
16232 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
16233 }
16234
16235 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
16236 /* This is a constructor, we must ensure that any default args
16237 introduced by this definition are propagated to the clones
16238 now. The clones are used directly in overload resolution. */
16239 adjust_clone_args (decl1);
16240
16241 /* Sometimes we don't notice that a function is a static member, and
16242 build a METHOD_TYPE for it. Fix that up now. */
16243 gcc_assert (!(ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
16244 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE));
16245
16246 /* Set up current_class_type, and enter the scope of the class, if
16247 appropriate. */
16248 if (ctype)
16249 push_nested_class (ctype);
16250 else if (DECL_STATIC_FUNCTION_P (decl1))
16251 push_nested_class (DECL_CONTEXT (decl1));
16252
16253 /* Now that we have entered the scope of the class, we must restore
16254 the bindings for any template parameters surrounding DECL1, if it
16255 is an inline member template. (Order is important; consider the
16256 case where a template parameter has the same name as a field of
16257 the class.) It is not until after this point that
16258 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
16259 if (flags & SF_INCLASS_INLINE)
16260 maybe_begin_member_template_processing (decl1);
16261
16262 /* Effective C++ rule 15. */
16263 if (warn_ecpp
16264 && DECL_ASSIGNMENT_OPERATOR_P (decl1)
16265 && DECL_OVERLOADED_OPERATOR_IS (decl1, NOP_EXPR)
16266 && VOID_TYPE_P (TREE_TYPE (fntype)))
16267 warning (OPT_Weffc__,
16268 "%<operator=%> should return a reference to %<*this%>");
16269
16270 /* Make the init_value nonzero so pushdecl knows this is not tentative.
16271 error_mark_node is replaced below (in poplevel) with the BLOCK. */
16272 if (!DECL_INITIAL (decl1))
16273 DECL_INITIAL (decl1) = error_mark_node;
16274
16275 /* This function exists in static storage.
16276 (This does not mean `static' in the C sense!) */
16277 TREE_STATIC (decl1) = 1;
16278
16279 /* We must call push_template_decl after current_class_type is set
16280 up. (If we are processing inline definitions after exiting a
16281 class scope, current_class_type will be NULL_TREE until set above
16282 by push_nested_class.) */
16283 if (processing_template_decl)
16284 {
16285 tree newdecl1 = push_template_decl (decl1);
16286 if (newdecl1 == error_mark_node)
16287 {
16288 if (ctype || DECL_STATIC_FUNCTION_P (decl1))
16289 pop_nested_class ();
16290 return false;
16291 }
16292 decl1 = newdecl1;
16293 }
16294
16295 /* Make sure the parameter and return types are reasonable. When
16296 you declare a function, these types can be incomplete, but they
16297 must be complete when you define the function. */
16298 check_function_type (decl1, DECL_ARGUMENTS (decl1));
16299
16300 /* Build the return declaration for the function. */
16301 restype = TREE_TYPE (fntype);
16302
16303 if (DECL_RESULT (decl1) == NULL_TREE)
16304 {
16305 tree resdecl;
16306
16307 resdecl = build_decl (input_location, RESULT_DECL, 0, restype);
16308 DECL_ARTIFICIAL (resdecl) = 1;
16309 DECL_IGNORED_P (resdecl) = 1;
16310 DECL_RESULT (decl1) = resdecl;
16311
16312 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
16313 }
16314
16315 /* Record the decl so that the function name is defined.
16316 If we already have a decl for this name, and it is a FUNCTION_DECL,
16317 use the old decl. */
16318 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
16319 {
16320 /* A specialization is not used to guide overload resolution. */
16321 if (!DECL_FUNCTION_MEMBER_P (decl1)
16322 && !(DECL_USE_TEMPLATE (decl1) &&
16323 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
16324 {
16325 tree olddecl = pushdecl (decl1);
16326
16327 if (olddecl == error_mark_node)
16328 /* If something went wrong when registering the declaration,
16329 use DECL1; we have to have a FUNCTION_DECL to use when
16330 parsing the body of the function. */
16331 ;
16332 else
16333 {
16334 /* Otherwise, OLDDECL is either a previous declaration
16335 of the same function or DECL1 itself. */
16336
16337 if (warn_missing_declarations
16338 && olddecl == decl1
16339 && !DECL_MAIN_P (decl1)
16340 && TREE_PUBLIC (decl1)
16341 && !DECL_DECLARED_INLINE_P (decl1))
16342 {
16343 tree context;
16344
16345 /* Check whether DECL1 is in an anonymous
16346 namespace. */
16347 for (context = DECL_CONTEXT (decl1);
16348 context;
16349 context = DECL_CONTEXT (context))
16350 {
16351 if (TREE_CODE (context) == NAMESPACE_DECL
16352 && DECL_NAME (context) == NULL_TREE)
16353 break;
16354 }
16355
16356 if (context == NULL)
16357 warning_at (DECL_SOURCE_LOCATION (decl1),
16358 OPT_Wmissing_declarations,
16359 "no previous declaration for %qD", decl1);
16360 }
16361
16362 decl1 = olddecl;
16363 }
16364 }
16365 else
16366 {
16367 /* We need to set the DECL_CONTEXT. */
16368 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
16369 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
16370 }
16371 fntype = TREE_TYPE (decl1);
16372 restype = TREE_TYPE (fntype);
16373
16374 /* If #pragma weak applies, mark the decl appropriately now.
16375 The pragma only applies to global functions. Because
16376 determining whether or not the #pragma applies involves
16377 computing the mangled name for the declaration, we cannot
16378 apply the pragma until after we have merged this declaration
16379 with any previous declarations; if the original declaration
16380 has a linkage specification, that specification applies to
16381 the definition as well, and may affect the mangled name. */
16382 if (DECL_FILE_SCOPE_P (decl1))
16383 maybe_apply_pragma_weak (decl1);
16384 }
16385
16386 /* We are now in the scope of the function being defined. */
16387 current_function_decl = decl1;
16388
16389 /* Save the parm names or decls from this function's declarator
16390 where store_parm_decls will find them. */
16391 current_function_parms = DECL_ARGUMENTS (decl1);
16392
16393 /* Let the user know we're compiling this function. */
16394 announce_function (decl1);
16395
16396 gcc_assert (DECL_INITIAL (decl1));
16397
16398 /* This function may already have been parsed, in which case just
16399 return; our caller will skip over the body without parsing. */
16400 if (DECL_INITIAL (decl1) != error_mark_node)
16401 return true;
16402
16403 /* Initialize RTL machinery. We cannot do this until
16404 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
16405 even when processing a template; this is how we get
16406 CFUN set up, and our per-function variables initialized.
16407 FIXME factor out the non-RTL stuff. */
16408 bl = current_binding_level;
16409 allocate_struct_function (decl1, processing_template_decl);
16410
16411 /* Initialize the language data structures. Whenever we start
16412 a new function, we destroy temporaries in the usual way. */
16413 cfun->language = ggc_cleared_alloc<language_function> ();
16414 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
16415 current_binding_level = bl;
16416
16417 /* If we are (erroneously) defining a function that we have already
16418 defined before, wipe out what we knew before. */
16419 gcc_checking_assert (!DECL_PENDING_INLINE_P (decl1));
16420 FNDECL_USED_AUTO (decl1) = false;
16421 DECL_SAVED_AUTO_RETURN_TYPE (decl1) = NULL;
16422
16423 if (!processing_template_decl && type_uses_auto (restype))
16424 {
16425 FNDECL_USED_AUTO (decl1) = true;
16426 DECL_SAVED_AUTO_RETURN_TYPE (decl1) = restype;
16427 }
16428
16429 /* Start the statement-tree, start the tree now. */
16430 DECL_SAVED_TREE (decl1) = push_stmt_list ();
16431
16432 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
16433 {
16434 /* We know that this was set up by `grokclassfn'. We do not
16435 wait until `store_parm_decls', since evil parse errors may
16436 never get us to that point. Here we keep the consistency
16437 between `current_class_type' and `current_class_ptr'. */
16438 tree t = DECL_ARGUMENTS (decl1);
16439
16440 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
16441 gcc_assert (TYPE_PTR_P (TREE_TYPE (t)));
16442
16443 cp_function_chain->x_current_class_ref
16444 = cp_build_fold_indirect_ref (t);
16445 /* Set this second to avoid shortcut in cp_build_indirect_ref. */
16446 cp_function_chain->x_current_class_ptr = t;
16447
16448 /* Constructors and destructors need to know whether they're "in
16449 charge" of initializing virtual base classes. */
16450 t = DECL_CHAIN (t);
16451 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
16452 {
16453 current_in_charge_parm = t;
16454 t = DECL_CHAIN (t);
16455 }
16456 if (DECL_HAS_VTT_PARM_P (decl1))
16457 {
16458 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
16459 current_vtt_parm = t;
16460 }
16461 }
16462
16463 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
16464 /* Implicitly-defined methods (like the
16465 destructor for a class in which no destructor
16466 is explicitly declared) must not be defined
16467 until their definition is needed. So, we
16468 ignore interface specifications for
16469 compiler-generated functions. */
16470 && !DECL_ARTIFICIAL (decl1));
16471
16472 if (processing_template_decl)
16473 /* Don't mess with interface flags. */;
16474 else if (DECL_INTERFACE_KNOWN (decl1))
16475 {
16476 tree ctx = decl_function_context (decl1);
16477
16478 if (DECL_NOT_REALLY_EXTERN (decl1))
16479 DECL_EXTERNAL (decl1) = 0;
16480
16481 if (ctx != NULL_TREE && vague_linkage_p (ctx))
16482 /* This is a function in a local class in an extern inline
16483 or template function. */
16484 comdat_linkage (decl1);
16485 }
16486 /* If this function belongs to an interface, it is public.
16487 If it belongs to someone else's interface, it is also external.
16488 This only affects inlines and template instantiations. */
16489 else if (!finfo->interface_unknown && honor_interface)
16490 {
16491 if (DECL_DECLARED_INLINE_P (decl1)
16492 || DECL_TEMPLATE_INSTANTIATION (decl1))
16493 {
16494 DECL_EXTERNAL (decl1)
16495 = (finfo->interface_only
16496 || (DECL_DECLARED_INLINE_P (decl1)
16497 && ! flag_implement_inlines
16498 && !DECL_VINDEX (decl1)));
16499
16500 /* For WIN32 we also want to put these in linkonce sections. */
16501 maybe_make_one_only (decl1);
16502 }
16503 else
16504 DECL_EXTERNAL (decl1) = 0;
16505 DECL_INTERFACE_KNOWN (decl1) = 1;
16506 /* If this function is in an interface implemented in this file,
16507 make sure that the back end knows to emit this function
16508 here. */
16509 if (!DECL_EXTERNAL (decl1))
16510 mark_needed (decl1);
16511 }
16512 else if (finfo->interface_unknown && finfo->interface_only
16513 && honor_interface)
16514 {
16515 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
16516 interface, we will have both finfo->interface_unknown and
16517 finfo->interface_only set. In that case, we don't want to
16518 use the normal heuristics because someone will supply a
16519 #pragma implementation elsewhere, and deducing it here would
16520 produce a conflict. */
16521 comdat_linkage (decl1);
16522 DECL_EXTERNAL (decl1) = 0;
16523 DECL_INTERFACE_KNOWN (decl1) = 1;
16524 DECL_DEFER_OUTPUT (decl1) = 1;
16525 }
16526 else
16527 {
16528 /* This is a definition, not a reference.
16529 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
16530 if (!GNU_INLINE_P (decl1))
16531 DECL_EXTERNAL (decl1) = 0;
16532
16533 if ((DECL_DECLARED_INLINE_P (decl1)
16534 || DECL_TEMPLATE_INSTANTIATION (decl1))
16535 && ! DECL_INTERFACE_KNOWN (decl1))
16536 DECL_DEFER_OUTPUT (decl1) = 1;
16537 else
16538 DECL_INTERFACE_KNOWN (decl1) = 1;
16539 }
16540
16541 /* Determine the ELF visibility attribute for the function. We must not
16542 do this before calling "pushdecl", as we must allow "duplicate_decls"
16543 to merge any attributes appropriately. We also need to wait until
16544 linkage is set. */
16545 if (!DECL_CLONED_FUNCTION_P (decl1))
16546 determine_visibility (decl1);
16547
16548 if (!processing_template_decl)
16549 maybe_instantiate_noexcept (decl1);
16550
16551 begin_scope (sk_function_parms, decl1);
16552
16553 ++function_depth;
16554
16555 if (DECL_DESTRUCTOR_P (decl1)
16556 || (DECL_CONSTRUCTOR_P (decl1)
16557 && targetm.cxx.cdtor_returns_this ()))
16558 {
16559 cdtor_label = create_artificial_label (input_location);
16560 LABEL_DECL_CDTOR (cdtor_label) = true;
16561 }
16562
16563 start_fname_decls ();
16564
16565 store_parm_decls (current_function_parms);
16566
16567 push_operator_bindings ();
16568
16569 if (!processing_template_decl
16570 && (flag_lifetime_dse > 1)
16571 && DECL_CONSTRUCTOR_P (decl1)
16572 && !DECL_CLONED_FUNCTION_P (decl1)
16573 /* Clobbering an empty base is harmful if it overlays real data. */
16574 && !is_empty_class (current_class_type)
16575 /* We can't clobber safely for an implicitly-defined default constructor
16576 because part of the initialization might happen before we enter the
16577 constructor, via AGGR_INIT_ZERO_FIRST (c++/68006). */
16578 && !implicit_default_ctor_p (decl1))
16579 finish_expr_stmt (build_clobber_this ());
16580
16581 if (!processing_template_decl
16582 && DECL_CONSTRUCTOR_P (decl1)
16583 && sanitize_flags_p (SANITIZE_VPTR)
16584 && !DECL_CLONED_FUNCTION_P (decl1)
16585 && !implicit_default_ctor_p (decl1))
16586 cp_ubsan_maybe_initialize_vtbl_ptrs (current_class_ptr);
16587
16588 if (!DECL_OMP_DECLARE_REDUCTION_P (decl1))
16589 start_lambda_scope (decl1);
16590
16591 return true;
16592 }
16593
16594
16595 /* Like start_preparsed_function, except that instead of a
16596 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
16597
16598 Returns true on success. If the DECLARATOR is not suitable
16599 for a function, we return false, which tells the parser to
16600 skip the entire function. */
16601
16602 bool
start_function(cp_decl_specifier_seq * declspecs,const cp_declarator * declarator,tree attrs)16603 start_function (cp_decl_specifier_seq *declspecs,
16604 const cp_declarator *declarator,
16605 tree attrs)
16606 {
16607 tree decl1;
16608
16609 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
16610 invoke_plugin_callbacks (PLUGIN_START_PARSE_FUNCTION, decl1);
16611 if (decl1 == error_mark_node)
16612 return false;
16613
16614 if (DECL_MAIN_P (decl1))
16615 /* main must return int. grokfndecl should have corrected it
16616 (and issued a diagnostic) if the user got it wrong. */
16617 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
16618 integer_type_node));
16619
16620 return start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
16621 }
16622
16623 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
16624 FN. */
16625
16626 static bool
use_eh_spec_block(tree fn)16627 use_eh_spec_block (tree fn)
16628 {
16629 return (flag_exceptions && flag_enforce_eh_specs
16630 && !processing_template_decl
16631 /* We insert the EH_SPEC_BLOCK only in the original
16632 function; then, it is copied automatically to the
16633 clones. */
16634 && !DECL_CLONED_FUNCTION_P (fn)
16635 /* Implicitly-generated constructors and destructors have
16636 exception specifications. However, those specifications
16637 are the union of the possible exceptions specified by the
16638 constructors/destructors for bases and members, so no
16639 unallowed exception will ever reach this function. By
16640 not creating the EH_SPEC_BLOCK we save a little memory,
16641 and we avoid spurious warnings about unreachable
16642 code. */
16643 && !DECL_DEFAULTED_FN (fn)
16644 && !type_throw_all_p (TREE_TYPE (fn)));
16645 }
16646
16647 /* Helper function to push ARGS into the current lexical scope. DECL
16648 is the function declaration. NONPARMS is used to handle enum
16649 constants. */
16650
16651 void
do_push_parm_decls(tree decl,tree args,tree * nonparms)16652 do_push_parm_decls (tree decl, tree args, tree *nonparms)
16653 {
16654 /* If we're doing semantic analysis, then we'll call pushdecl
16655 for each of these. We must do them in reverse order so that
16656 they end in the correct forward order. */
16657 args = nreverse (args);
16658
16659 tree next;
16660 for (tree parm = args; parm; parm = next)
16661 {
16662 next = DECL_CHAIN (parm);
16663 if (TREE_CODE (parm) == PARM_DECL)
16664 pushdecl (parm);
16665 else if (nonparms)
16666 {
16667 /* If we find an enum constant or a type tag, put it aside for
16668 the moment. */
16669 TREE_CHAIN (parm) = NULL_TREE;
16670 *nonparms = chainon (*nonparms, parm);
16671 }
16672 }
16673
16674 /* Get the decls in their original chain order and record in the
16675 function. This is all and only the PARM_DECLs that were
16676 pushed into scope by the loop above. */
16677 DECL_ARGUMENTS (decl) = get_local_decls ();
16678 }
16679
16680 /* Store the parameter declarations into the current function declaration.
16681 This is called after parsing the parameter declarations, before
16682 digesting the body of the function.
16683
16684 Also install to binding contour return value identifier, if any. */
16685
16686 static void
store_parm_decls(tree current_function_parms)16687 store_parm_decls (tree current_function_parms)
16688 {
16689 tree fndecl = current_function_decl;
16690
16691 /* This is a chain of any other decls that came in among the parm
16692 declarations. If a parm is declared with enum {foo, bar} x;
16693 then CONST_DECLs for foo and bar are put here. */
16694 tree nonparms = NULL_TREE;
16695
16696 if (current_function_parms)
16697 {
16698 /* This case is when the function was defined with an ANSI prototype.
16699 The parms already have decls, so we need not do anything here
16700 except record them as in effect
16701 and complain if any redundant old-style parm decls were written. */
16702
16703 tree specparms = current_function_parms;
16704
16705 /* Must clear this because it might contain TYPE_DECLs declared
16706 at class level. */
16707 current_binding_level->names = NULL;
16708
16709 do_push_parm_decls (fndecl, specparms, &nonparms);
16710 }
16711 else
16712 DECL_ARGUMENTS (fndecl) = NULL_TREE;
16713
16714 /* Now store the final chain of decls for the arguments
16715 as the decl-chain of the current lexical scope.
16716 Put the enumerators in as well, at the front so that
16717 DECL_ARGUMENTS is not modified. */
16718 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
16719
16720 if (use_eh_spec_block (current_function_decl))
16721 current_eh_spec_block = begin_eh_spec_block ();
16722 }
16723
16724
16725 /* Set the return value of the constructor (if present). */
16726
16727 static void
finish_constructor_body(void)16728 finish_constructor_body (void)
16729 {
16730 tree val;
16731 tree exprstmt;
16732
16733 if (targetm.cxx.cdtor_returns_this ())
16734 {
16735 /* Any return from a constructor will end up here. */
16736 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
16737
16738 val = DECL_ARGUMENTS (current_function_decl);
16739 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
16740 DECL_RESULT (current_function_decl), val);
16741 /* Return the address of the object. */
16742 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
16743 add_stmt (exprstmt);
16744 }
16745 }
16746
16747 /* Do all the processing for the beginning of a destructor; set up the
16748 vtable pointers and cleanups for bases and members. */
16749
16750 static void
begin_destructor_body(void)16751 begin_destructor_body (void)
16752 {
16753 tree compound_stmt;
16754
16755 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
16756 issued an error message. We still want to try to process the
16757 body of the function, but initialize_vtbl_ptrs will crash if
16758 TYPE_BINFO is NULL. */
16759 if (COMPLETE_TYPE_P (current_class_type))
16760 {
16761 compound_stmt = begin_compound_stmt (0);
16762 /* Make all virtual function table pointers in non-virtual base
16763 classes point to CURRENT_CLASS_TYPE's virtual function
16764 tables. */
16765 initialize_vtbl_ptrs (current_class_ptr);
16766 finish_compound_stmt (compound_stmt);
16767
16768 if (flag_lifetime_dse
16769 /* Clobbering an empty base is harmful if it overlays real data. */
16770 && !is_empty_class (current_class_type))
16771 {
16772 if (sanitize_flags_p (SANITIZE_VPTR)
16773 && (flag_sanitize_recover & SANITIZE_VPTR) == 0
16774 && TYPE_CONTAINS_VPTR_P (current_class_type))
16775 {
16776 tree binfo = TYPE_BINFO (current_class_type);
16777 tree ref
16778 = cp_build_fold_indirect_ref (current_class_ptr);
16779
16780 tree vtbl_ptr = build_vfield_ref (ref, TREE_TYPE (binfo));
16781 tree vtbl = build_zero_cst (TREE_TYPE (vtbl_ptr));
16782 tree stmt = cp_build_modify_expr (input_location, vtbl_ptr,
16783 NOP_EXPR, vtbl,
16784 tf_warning_or_error);
16785 /* If the vptr is shared with some virtual nearly empty base,
16786 don't clear it if not in charge, the dtor of the virtual
16787 nearly empty base will do that later. */
16788 if (CLASSTYPE_VBASECLASSES (current_class_type))
16789 {
16790 tree c = current_class_type;
16791 while (CLASSTYPE_PRIMARY_BINFO (c))
16792 {
16793 if (BINFO_VIRTUAL_P (CLASSTYPE_PRIMARY_BINFO (c)))
16794 {
16795 stmt = convert_to_void (stmt, ICV_STATEMENT,
16796 tf_warning_or_error);
16797 stmt = build_if_in_charge (stmt);
16798 break;
16799 }
16800 c = BINFO_TYPE (CLASSTYPE_PRIMARY_BINFO (c));
16801 }
16802 }
16803 finish_decl_cleanup (NULL_TREE, stmt);
16804 }
16805 else
16806 finish_decl_cleanup (NULL_TREE, build_clobber_this ());
16807 }
16808
16809 /* And insert cleanups for our bases and members so that they
16810 will be properly destroyed if we throw. */
16811 push_base_cleanups ();
16812 }
16813 }
16814
16815 /* At the end of every destructor we generate code to delete the object if
16816 necessary. Do that now. */
16817
16818 static void
finish_destructor_body(void)16819 finish_destructor_body (void)
16820 {
16821 tree exprstmt;
16822
16823 /* Any return from a destructor will end up here; that way all base
16824 and member cleanups will be run when the function returns. */
16825 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
16826
16827 if (targetm.cxx.cdtor_returns_this ())
16828 {
16829 tree val;
16830
16831 val = DECL_ARGUMENTS (current_function_decl);
16832 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
16833 DECL_RESULT (current_function_decl), val);
16834 /* Return the address of the object. */
16835 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
16836 add_stmt (exprstmt);
16837 }
16838 }
16839
16840 /* Do the necessary processing for the beginning of a function body, which
16841 in this case includes member-initializers, but not the catch clauses of
16842 a function-try-block. Currently, this means opening a binding level
16843 for the member-initializers (in a ctor), member cleanups (in a dtor),
16844 and capture proxies (in a lambda operator()). */
16845
16846 tree
begin_function_body(void)16847 begin_function_body (void)
16848 {
16849 tree stmt;
16850
16851 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
16852 return NULL_TREE;
16853
16854 if (processing_template_decl)
16855 /* Do nothing now. */;
16856 else
16857 /* Always keep the BLOCK node associated with the outermost pair of
16858 curly braces of a function. These are needed for correct
16859 operation of dwarfout.c. */
16860 keep_next_level (true);
16861
16862 stmt = begin_compound_stmt (BCS_FN_BODY);
16863
16864 if (processing_template_decl)
16865 /* Do nothing now. */;
16866 else if (DECL_DESTRUCTOR_P (current_function_decl))
16867 begin_destructor_body ();
16868
16869 return stmt;
16870 }
16871
16872 /* Do the processing for the end of a function body. Currently, this means
16873 closing out the cleanups for fully-constructed bases and members, and in
16874 the case of the destructor, deleting the object if desired. Again, this
16875 is only meaningful for [cd]tors, since they are the only functions where
16876 there is a significant distinction between the main body and any
16877 function catch clauses. Handling, say, main() return semantics here
16878 would be wrong, as flowing off the end of a function catch clause for
16879 main() would also need to return 0. */
16880
16881 void
finish_function_body(tree compstmt)16882 finish_function_body (tree compstmt)
16883 {
16884 if (compstmt == NULL_TREE)
16885 return;
16886
16887 /* Close the block. */
16888 finish_compound_stmt (compstmt);
16889
16890 if (processing_template_decl)
16891 /* Do nothing now. */;
16892 else if (DECL_CONSTRUCTOR_P (current_function_decl))
16893 finish_constructor_body ();
16894 else if (DECL_DESTRUCTOR_P (current_function_decl))
16895 finish_destructor_body ();
16896 }
16897
16898 /* Given a function, returns the BLOCK corresponding to the outermost level
16899 of curly braces, skipping the artificial block created for constructor
16900 initializers. */
16901
16902 tree
outer_curly_brace_block(tree fndecl)16903 outer_curly_brace_block (tree fndecl)
16904 {
16905 tree block = DECL_INITIAL (fndecl);
16906 if (BLOCK_OUTER_CURLY_BRACE_P (block))
16907 return block;
16908 block = BLOCK_SUBBLOCKS (block);
16909 if (BLOCK_OUTER_CURLY_BRACE_P (block))
16910 return block;
16911 block = BLOCK_SUBBLOCKS (block);
16912 gcc_assert (BLOCK_OUTER_CURLY_BRACE_P (block));
16913 return block;
16914 }
16915
16916 /* If FNDECL is a class's key method, add the class to the list of
16917 keyed classes that should be emitted. */
16918
16919 static void
record_key_method_defined(tree fndecl)16920 record_key_method_defined (tree fndecl)
16921 {
16922 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
16923 && DECL_VIRTUAL_P (fndecl)
16924 && !processing_template_decl)
16925 {
16926 tree fnclass = DECL_CONTEXT (fndecl);
16927 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
16928 vec_safe_push (keyed_classes, fnclass);
16929 }
16930 }
16931
16932 /* Subroutine of finish_function.
16933 Save the body of constexpr functions for possible
16934 future compile time evaluation. */
16935
16936 static void
maybe_save_function_definition(tree fun)16937 maybe_save_function_definition (tree fun)
16938 {
16939 if (!processing_template_decl
16940 && DECL_DECLARED_CONSTEXPR_P (fun)
16941 && !cp_function_chain->invalid_constexpr
16942 && !DECL_CLONED_FUNCTION_P (fun))
16943 register_constexpr_fundef (fun, DECL_SAVED_TREE (fun));
16944 }
16945
16946 /* Attempt to add a fix-it hint to RICHLOC suggesting the insertion
16947 of "return *this;" immediately before its location, using FNDECL's
16948 first statement (if any) to give the indentation, if appropriate. */
16949
16950 static void
add_return_star_this_fixit(gcc_rich_location * richloc,tree fndecl)16951 add_return_star_this_fixit (gcc_rich_location *richloc, tree fndecl)
16952 {
16953 location_t indent = UNKNOWN_LOCATION;
16954 tree stmts = expr_first (DECL_SAVED_TREE (fndecl));
16955 if (stmts)
16956 indent = EXPR_LOCATION (stmts);
16957 richloc->add_fixit_insert_formatted ("return *this;",
16958 richloc->get_loc (),
16959 indent);
16960 }
16961
16962 /* This function carries out the subset of finish_function operations needed
16963 to emit the compiler-generated outlined helper functions used by the
16964 coroutines implementation. */
16965
16966 static void
emit_coro_helper(tree helper)16967 emit_coro_helper (tree helper)
16968 {
16969 /* This is a partial set of the operations done by finish_function()
16970 plus emitting the result. */
16971 set_cfun (NULL);
16972 current_function_decl = helper;
16973 begin_scope (sk_function_parms, NULL);
16974 store_parm_decls (DECL_ARGUMENTS (helper));
16975 announce_function (helper);
16976 allocate_struct_function (helper, false);
16977 cfun->language = ggc_cleared_alloc<language_function> ();
16978 poplevel (1, 0, 1);
16979 maybe_save_function_definition (helper);
16980 /* We must start each function with a clear fold cache. */
16981 clear_fold_cache ();
16982 cp_fold_function (helper);
16983 DECL_CONTEXT (DECL_RESULT (helper)) = helper;
16984 BLOCK_SUPERCONTEXT (DECL_INITIAL (helper)) = helper;
16985 /* This function has coroutine IFNs that we should handle in middle
16986 end lowering. */
16987 cfun->coroutine_component = true;
16988 cp_genericize (helper);
16989 expand_or_defer_fn (helper);
16990 }
16991
16992 /* Finish up a function declaration and compile that function
16993 all the way to assembler language output. The free the storage
16994 for the function definition. INLINE_P is TRUE if we just
16995 finished processing the body of an in-class inline function
16996 definition. (This processing will have taken place after the
16997 class definition is complete.) */
16998
16999 tree
finish_function(bool inline_p)17000 finish_function (bool inline_p)
17001 {
17002 tree fndecl = current_function_decl;
17003 tree fntype, ctype = NULL_TREE;
17004 tree resumer = NULL_TREE, destroyer = NULL_TREE;
17005 bool coro_p = flag_coroutines
17006 && !processing_template_decl
17007 && DECL_COROUTINE_P (fndecl);
17008 bool coro_emit_helpers = false;
17009
17010 /* When we get some parse errors, we can end up without a
17011 current_function_decl, so cope. */
17012 if (fndecl == NULL_TREE)
17013 return error_mark_node;
17014
17015 if (!DECL_OMP_DECLARE_REDUCTION_P (fndecl))
17016 finish_lambda_scope ();
17017
17018 if (c_dialect_objc ())
17019 objc_finish_function ();
17020
17021 record_key_method_defined (fndecl);
17022
17023 fntype = TREE_TYPE (fndecl);
17024
17025 /* TREE_READONLY (fndecl) = 1;
17026 This caused &foo to be of type ptr-to-const-function
17027 which then got a warning when stored in a ptr-to-function variable. */
17028
17029 gcc_assert (building_stmt_list_p ());
17030 /* The current function is being defined, so its DECL_INITIAL should
17031 be set, and unless there's a multiple definition, it should be
17032 error_mark_node. */
17033 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
17034
17035 if (coro_p)
17036 {
17037 /* Only try to emit the coroutine outlined helper functions if the
17038 transforms succeeded. Otherwise, treat errors in the same way as
17039 a regular function. */
17040 coro_emit_helpers = morph_fn_to_coro (fndecl, &resumer, &destroyer);
17041
17042 /* We should handle coroutine IFNs in middle end lowering. */
17043 cfun->coroutine_component = true;
17044
17045 /* Do not try to process the ramp's EH unless outlining succeeded. */
17046 if (coro_emit_helpers && use_eh_spec_block (fndecl))
17047 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
17048 (TREE_TYPE (fndecl)),
17049 current_eh_spec_block);
17050 }
17051 else
17052 /* For a cloned function, we've already got all the code we need;
17053 there's no need to add any extra bits. */
17054 if (!DECL_CLONED_FUNCTION_P (fndecl))
17055 {
17056 /* Make it so that `main' always returns 0 by default. */
17057 if (DECL_MAIN_P (current_function_decl))
17058 finish_return_stmt (integer_zero_node);
17059
17060 if (use_eh_spec_block (current_function_decl))
17061 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
17062 (TREE_TYPE (current_function_decl)),
17063 current_eh_spec_block);
17064 }
17065
17066 /* If we're saving up tree structure, tie off the function now. */
17067 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
17068
17069 finish_fname_decls ();
17070
17071 /* If this function can't throw any exceptions, remember that. */
17072 if (!processing_template_decl
17073 && !cp_function_chain->can_throw
17074 && !flag_non_call_exceptions
17075 && !decl_replaceable_p (fndecl))
17076 TREE_NOTHROW (fndecl) = 1;
17077
17078 /* This must come after expand_function_end because cleanups might
17079 have declarations (from inline functions) that need to go into
17080 this function's blocks. */
17081
17082 /* If the current binding level isn't the outermost binding level
17083 for this function, either there is a bug, or we have experienced
17084 syntax errors and the statement tree is malformed. */
17085 if (current_binding_level->kind != sk_function_parms)
17086 {
17087 /* Make sure we have already experienced errors. */
17088 gcc_assert (errorcount);
17089
17090 /* Throw away the broken statement tree and extra binding
17091 levels. */
17092 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
17093
17094 while (current_binding_level->kind != sk_function_parms)
17095 {
17096 if (current_binding_level->kind == sk_class)
17097 pop_nested_class ();
17098 else
17099 poplevel (0, 0, 0);
17100 }
17101 }
17102 poplevel (1, 0, 1);
17103
17104 /* Statements should always be full-expressions at the outermost set
17105 of curly braces for a function. */
17106 gcc_assert (stmts_are_full_exprs_p ());
17107
17108 /* If there are no return statements in a function with auto return type,
17109 the return type is void. But if the declared type is something like
17110 auto*, this is an error. */
17111 if (!processing_template_decl && FNDECL_USED_AUTO (fndecl)
17112 && TREE_TYPE (fntype) == DECL_SAVED_AUTO_RETURN_TYPE (fndecl))
17113 {
17114 if (is_auto (DECL_SAVED_AUTO_RETURN_TYPE (fndecl))
17115 && !current_function_returns_value
17116 && !current_function_returns_null)
17117 {
17118 /* We haven't applied return type deduction because we haven't
17119 seen any return statements. Do that now. */
17120 tree node = type_uses_auto (DECL_SAVED_AUTO_RETURN_TYPE (fndecl));
17121 do_auto_deduction (DECL_SAVED_AUTO_RETURN_TYPE (fndecl),
17122 void_node, node, tf_warning_or_error,
17123 adc_return_type);
17124
17125 apply_deduced_return_type (fndecl, void_type_node);
17126 fntype = TREE_TYPE (fndecl);
17127 }
17128 else if (!current_function_returns_value
17129 && !current_function_returns_null)
17130 {
17131 error ("no return statements in function returning %qT",
17132 DECL_SAVED_AUTO_RETURN_TYPE (fndecl));
17133 inform (input_location, "only plain %<auto%> return type can be "
17134 "deduced to %<void%>");
17135 }
17136 }
17137
17138 /* Remember that we were in class scope. */
17139 if (current_class_name)
17140 ctype = current_class_type;
17141
17142 if (DECL_DELETED_FN (fndecl))
17143 {
17144 DECL_INITIAL (fndecl) = error_mark_node;
17145 DECL_SAVED_TREE (fndecl) = NULL_TREE;
17146 goto cleanup;
17147 }
17148
17149 // If this is a concept, check that the definition is reasonable.
17150 if (DECL_DECLARED_CONCEPT_P (fndecl))
17151 check_function_concept (fndecl);
17152
17153 if (flag_openmp)
17154 if (tree attr = lookup_attribute ("omp declare variant base",
17155 DECL_ATTRIBUTES (fndecl)))
17156 omp_declare_variant_finalize (fndecl, attr);
17157
17158 /* Lambda closure members are implicitly constexpr if possible. */
17159 if (cxx_dialect >= cxx17
17160 && LAMBDA_TYPE_P (CP_DECL_CONTEXT (fndecl)))
17161 DECL_DECLARED_CONSTEXPR_P (fndecl)
17162 = ((processing_template_decl
17163 || is_valid_constexpr_fn (fndecl, /*complain*/false))
17164 && potential_constant_expression (DECL_SAVED_TREE (fndecl)));
17165
17166 /* Save constexpr function body before it gets munged by
17167 the NRV transformation. */
17168 maybe_save_function_definition (fndecl);
17169
17170 /* Invoke the pre-genericize plugin before we start munging things. */
17171 if (!processing_template_decl)
17172 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl);
17173
17174 /* Perform delayed folding before NRV transformation. */
17175 if (!processing_template_decl
17176 && !DECL_IMMEDIATE_FUNCTION_P (fndecl)
17177 && !DECL_OMP_DECLARE_REDUCTION_P (fndecl))
17178 cp_fold_function (fndecl);
17179
17180 /* Set up the named return value optimization, if we can. Candidate
17181 variables are selected in check_return_expr. */
17182 if (current_function_return_value)
17183 {
17184 tree r = current_function_return_value;
17185 tree outer;
17186
17187 if (r != error_mark_node
17188 /* This is only worth doing for fns that return in memory--and
17189 simpler, since we don't have to worry about promoted modes. */
17190 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
17191 /* Only allow this for variables declared in the outer scope of
17192 the function so we know that their lifetime always ends with a
17193 return; see g++.dg/opt/nrv6.C. We could be more flexible if
17194 we were to do this optimization in tree-ssa. */
17195 && (outer = outer_curly_brace_block (fndecl))
17196 && chain_member (r, BLOCK_VARS (outer)))
17197 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
17198
17199 current_function_return_value = NULL_TREE;
17200 }
17201
17202 /* Must mark the RESULT_DECL as being in this function. */
17203 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
17204
17205 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
17206 to the FUNCTION_DECL node itself. */
17207 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
17208
17209 /* Complain if there's just no return statement. */
17210 if (warn_return_type
17211 && !VOID_TYPE_P (TREE_TYPE (fntype))
17212 && !dependent_type_p (TREE_TYPE (fntype))
17213 && !current_function_returns_value && !current_function_returns_null
17214 /* Don't complain if we abort or throw. */
17215 && !current_function_returns_abnormally
17216 /* Don't complain if there's an infinite loop. */
17217 && !current_function_infinite_loop
17218 /* Don't complain if we are declared noreturn. */
17219 && !TREE_THIS_VOLATILE (fndecl)
17220 && !DECL_NAME (DECL_RESULT (fndecl))
17221 && !TREE_NO_WARNING (fndecl)
17222 /* Structor return values (if any) are set by the compiler. */
17223 && !DECL_CONSTRUCTOR_P (fndecl)
17224 && !DECL_DESTRUCTOR_P (fndecl)
17225 && targetm.warn_func_return (fndecl))
17226 {
17227 gcc_rich_location richloc (input_location);
17228 /* Potentially add a "return *this;" fix-it hint for
17229 assignment operators. */
17230 if (IDENTIFIER_ASSIGN_OP_P (DECL_NAME (fndecl)))
17231 {
17232 tree valtype = TREE_TYPE (DECL_RESULT (fndecl));
17233 if (TREE_CODE (valtype) == REFERENCE_TYPE
17234 && current_class_ref
17235 && same_type_ignoring_top_level_qualifiers_p
17236 (TREE_TYPE (valtype), TREE_TYPE (current_class_ref))
17237 && global_dc->option_enabled (OPT_Wreturn_type,
17238 global_dc->lang_mask,
17239 global_dc->option_state))
17240 add_return_star_this_fixit (&richloc, fndecl);
17241 }
17242 if (warning_at (&richloc, OPT_Wreturn_type,
17243 "no return statement in function returning non-void"))
17244 TREE_NO_WARNING (fndecl) = 1;
17245 }
17246
17247 /* Store the end of the function, so that we get good line number
17248 info for the epilogue. */
17249 cfun->function_end_locus = input_location;
17250
17251 /* Complain about parameters that are only set, but never otherwise used. */
17252 if (warn_unused_but_set_parameter
17253 && !processing_template_decl
17254 && errorcount == unused_but_set_errorcount
17255 && !DECL_CLONED_FUNCTION_P (fndecl))
17256 {
17257 tree decl;
17258
17259 for (decl = DECL_ARGUMENTS (fndecl);
17260 decl;
17261 decl = DECL_CHAIN (decl))
17262 if (TREE_USED (decl)
17263 && TREE_CODE (decl) == PARM_DECL
17264 && !DECL_READ_P (decl)
17265 && DECL_NAME (decl)
17266 && !DECL_ARTIFICIAL (decl)
17267 && !TREE_NO_WARNING (decl)
17268 && !DECL_IN_SYSTEM_HEADER (decl)
17269 && TREE_TYPE (decl) != error_mark_node
17270 && !TYPE_REF_P (TREE_TYPE (decl))
17271 && (!CLASS_TYPE_P (TREE_TYPE (decl))
17272 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
17273 warning_at (DECL_SOURCE_LOCATION (decl),
17274 OPT_Wunused_but_set_parameter,
17275 "parameter %qD set but not used", decl);
17276 unused_but_set_errorcount = errorcount;
17277 }
17278
17279 /* Complain about locally defined typedefs that are not used in this
17280 function. */
17281 maybe_warn_unused_local_typedefs ();
17282
17283 /* Possibly warn about unused parameters. */
17284 if (warn_unused_parameter
17285 && !processing_template_decl
17286 && !DECL_CLONED_FUNCTION_P (fndecl))
17287 do_warn_unused_parameter (fndecl);
17288
17289 /* Genericize before inlining. */
17290 if (!processing_template_decl
17291 && !DECL_IMMEDIATE_FUNCTION_P (fndecl)
17292 && !DECL_OMP_DECLARE_REDUCTION_P (fndecl))
17293 cp_genericize (fndecl);
17294
17295 /* Emit the resumer and destroyer functions now, providing that we have
17296 not encountered some fatal error. */
17297 if (coro_emit_helpers)
17298 {
17299 emit_coro_helper (resumer);
17300 emit_coro_helper (destroyer);
17301 }
17302
17303 cleanup:
17304 /* We're leaving the context of this function, so zap cfun. It's still in
17305 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
17306 set_cfun (NULL);
17307 current_function_decl = NULL;
17308
17309 /* If this is an in-class inline definition, we may have to pop the
17310 bindings for the template parameters that we added in
17311 maybe_begin_member_template_processing when start_function was
17312 called. */
17313 if (inline_p)
17314 maybe_end_member_template_processing ();
17315
17316 /* Leave the scope of the class. */
17317 if (ctype)
17318 pop_nested_class ();
17319
17320 --function_depth;
17321
17322 /* Clean up. */
17323 current_function_decl = NULL_TREE;
17324
17325 invoke_plugin_callbacks (PLUGIN_FINISH_PARSE_FUNCTION, fndecl);
17326 return fndecl;
17327 }
17328
17329 /* Create the FUNCTION_DECL for a function definition.
17330 DECLSPECS and DECLARATOR are the parts of the declaration;
17331 they describe the return type and the name of the function,
17332 but twisted together in a fashion that parallels the syntax of C.
17333
17334 This function creates a binding context for the function body
17335 as well as setting up the FUNCTION_DECL in current_function_decl.
17336
17337 Returns a FUNCTION_DECL on success.
17338
17339 If the DECLARATOR is not suitable for a function (it defines a datum
17340 instead), we return 0, which tells yyparse to report a parse error.
17341
17342 May return void_type_node indicating that this method is actually
17343 a friend. See grokfield for more details.
17344
17345 Came here with a `.pushlevel' .
17346
17347 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
17348 CHANGES TO CODE IN `grokfield'. */
17349
17350 tree
grokmethod(cp_decl_specifier_seq * declspecs,const cp_declarator * declarator,tree attrlist)17351 grokmethod (cp_decl_specifier_seq *declspecs,
17352 const cp_declarator *declarator, tree attrlist)
17353 {
17354 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
17355 &attrlist);
17356
17357 if (fndecl == error_mark_node)
17358 return error_mark_node;
17359
17360 if (attrlist)
17361 cplus_decl_attributes (&fndecl, attrlist, 0);
17362
17363 /* Pass friends other than inline friend functions back. */
17364 if (fndecl == void_type_node)
17365 return fndecl;
17366
17367 if (DECL_IN_AGGR_P (fndecl))
17368 {
17369 if (DECL_CLASS_SCOPE_P (fndecl))
17370 error ("%qD is already defined in class %qT", fndecl,
17371 DECL_CONTEXT (fndecl));
17372 return error_mark_node;
17373 }
17374
17375 check_template_shadow (fndecl);
17376
17377 if (TREE_PUBLIC (fndecl))
17378 DECL_COMDAT (fndecl) = 1;
17379 DECL_DECLARED_INLINE_P (fndecl) = 1;
17380 DECL_NO_INLINE_WARNING_P (fndecl) = 1;
17381
17382 /* We process method specializations in finish_struct_1. */
17383 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
17384 {
17385 fndecl = push_template_decl (fndecl);
17386 if (fndecl == error_mark_node)
17387 return fndecl;
17388 }
17389
17390 if (! DECL_FRIEND_P (fndecl))
17391 {
17392 if (DECL_CHAIN (fndecl))
17393 {
17394 fndecl = copy_node (fndecl);
17395 TREE_CHAIN (fndecl) = NULL_TREE;
17396 }
17397 }
17398
17399 cp_finish_decl (fndecl, NULL_TREE, false, NULL_TREE, 0);
17400
17401 DECL_IN_AGGR_P (fndecl) = 1;
17402 return fndecl;
17403 }
17404
17405
17406 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
17407 we can lay it out later, when and if its type becomes complete.
17408
17409 Also handle constexpr variables where the initializer involves
17410 an unlowered PTRMEM_CST because the class isn't complete yet. */
17411
17412 void
maybe_register_incomplete_var(tree var)17413 maybe_register_incomplete_var (tree var)
17414 {
17415 gcc_assert (VAR_P (var));
17416
17417 /* Keep track of variables with incomplete types. */
17418 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
17419 && DECL_EXTERNAL (var))
17420 {
17421 tree inner_type = TREE_TYPE (var);
17422
17423 while (TREE_CODE (inner_type) == ARRAY_TYPE)
17424 inner_type = TREE_TYPE (inner_type);
17425 inner_type = TYPE_MAIN_VARIANT (inner_type);
17426
17427 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
17428 /* RTTI TD entries are created while defining the type_info. */
17429 || (TYPE_LANG_SPECIFIC (inner_type)
17430 && TYPE_BEING_DEFINED (inner_type)))
17431 {
17432 incomplete_var iv = {var, inner_type};
17433 vec_safe_push (incomplete_vars, iv);
17434 }
17435 else if (!(DECL_LANG_SPECIFIC (var) && DECL_TEMPLATE_INFO (var))
17436 && decl_constant_var_p (var)
17437 && (TYPE_PTRMEM_P (inner_type) || CLASS_TYPE_P (inner_type)))
17438 {
17439 /* When the outermost open class is complete we can resolve any
17440 pointers-to-members. */
17441 tree context = outermost_open_class ();
17442 incomplete_var iv = {var, context};
17443 vec_safe_push (incomplete_vars, iv);
17444 }
17445 }
17446 }
17447
17448 /* Called when a class type (given by TYPE) is defined. If there are
17449 any existing VAR_DECLs whose type has been completed by this
17450 declaration, update them now. */
17451
17452 void
complete_vars(tree type)17453 complete_vars (tree type)
17454 {
17455 unsigned ix;
17456 incomplete_var *iv;
17457
17458 for (ix = 0; vec_safe_iterate (incomplete_vars, ix, &iv); )
17459 {
17460 if (same_type_p (type, iv->incomplete_type))
17461 {
17462 tree var = iv->decl;
17463 tree type = TREE_TYPE (var);
17464
17465 if (type != error_mark_node
17466 && (TYPE_MAIN_VARIANT (strip_array_types (type))
17467 == iv->incomplete_type))
17468 {
17469 /* Complete the type of the variable. The VAR_DECL itself
17470 will be laid out in expand_expr. */
17471 complete_type (type);
17472 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
17473 }
17474
17475 /* Remove this entry from the list. */
17476 incomplete_vars->unordered_remove (ix);
17477 }
17478 else
17479 ix++;
17480 }
17481
17482 /* Check for pending declarations which may have abstract type. */
17483 complete_type_check_abstract (type);
17484 }
17485
17486 /* If DECL is of a type which needs a cleanup, build and return an
17487 expression to perform that cleanup here. Return NULL_TREE if no
17488 cleanup need be done. DECL can also be a _REF when called from
17489 split_nonconstant_init_1. */
17490
17491 tree
cxx_maybe_build_cleanup(tree decl,tsubst_flags_t complain)17492 cxx_maybe_build_cleanup (tree decl, tsubst_flags_t complain)
17493 {
17494 tree type;
17495 tree attr;
17496 tree cleanup;
17497
17498 /* Assume no cleanup is required. */
17499 cleanup = NULL_TREE;
17500
17501 if (error_operand_p (decl))
17502 return cleanup;
17503
17504 /* Handle "__attribute__((cleanup))". We run the cleanup function
17505 before the destructor since the destructor is what actually
17506 terminates the lifetime of the object. */
17507 if (DECL_P (decl))
17508 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
17509 else
17510 attr = NULL_TREE;
17511 if (attr)
17512 {
17513 tree id;
17514 tree fn;
17515 tree arg;
17516
17517 /* Get the name specified by the user for the cleanup function. */
17518 id = TREE_VALUE (TREE_VALUE (attr));
17519 /* Look up the name to find the cleanup function to call. It is
17520 important to use lookup_name here because that is what is
17521 used in c-common.c:handle_cleanup_attribute when performing
17522 initial checks on the attribute. Note that those checks
17523 include ensuring that the function found is not an overloaded
17524 function, or an object with an overloaded call operator,
17525 etc.; we can rely on the fact that the function found is an
17526 ordinary FUNCTION_DECL. */
17527 fn = lookup_name (id);
17528 arg = build_address (decl);
17529 if (!mark_used (decl, complain) && !(complain & tf_error))
17530 return error_mark_node;
17531 cleanup = cp_build_function_call_nary (fn, complain, arg, NULL_TREE);
17532 if (cleanup == error_mark_node)
17533 return error_mark_node;
17534 }
17535 /* Handle ordinary C++ destructors. */
17536 type = TREE_TYPE (decl);
17537 if (type_build_dtor_call (type))
17538 {
17539 int flags = LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR;
17540 tree addr;
17541 tree call;
17542
17543 if (TREE_CODE (type) == ARRAY_TYPE)
17544 addr = decl;
17545 else
17546 addr = build_address (decl);
17547
17548 call = build_delete (input_location, TREE_TYPE (addr), addr,
17549 sfk_complete_destructor, flags, 0, complain);
17550 if (call == error_mark_node)
17551 cleanup = error_mark_node;
17552 else if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
17553 /* Discard the call. */;
17554 else if (decl_maybe_constant_destruction (decl, type)
17555 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl))
17556 cxx_constant_dtor (call, decl);
17557 else if (cleanup)
17558 cleanup = cp_build_compound_expr (cleanup, call, complain);
17559 else
17560 cleanup = call;
17561 }
17562
17563 /* build_delete sets the location of the destructor call to the
17564 current location, even though the destructor is going to be
17565 called later, at the end of the current scope. This can lead to
17566 a "jumpy" behavior for users of debuggers when they step around
17567 the end of the block. So let's unset the location of the
17568 destructor call instead. */
17569 protected_set_expr_location (cleanup, UNKNOWN_LOCATION);
17570 if (cleanup && CONVERT_EXPR_P (cleanup))
17571 protected_set_expr_location (TREE_OPERAND (cleanup, 0), UNKNOWN_LOCATION);
17572
17573 if (cleanup
17574 && DECL_P (decl)
17575 && !lookup_attribute ("warn_unused", TYPE_ATTRIBUTES (TREE_TYPE (decl)))
17576 /* Treat objects with destructors as used; the destructor may do
17577 something substantive. */
17578 && !mark_used (decl, complain) && !(complain & tf_error))
17579 return error_mark_node;
17580
17581 if (cleanup && cfun && !processing_template_decl
17582 && !expr_noexcept_p (cleanup, tf_none))
17583 cp_function_chain->throwing_cleanup = true;
17584
17585 return cleanup;
17586 }
17587
17588
17589 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
17590 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
17591 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
17592
17593 tree
static_fn_type(tree memfntype)17594 static_fn_type (tree memfntype)
17595 {
17596 tree fntype;
17597 tree args;
17598
17599 if (TYPE_PTRMEMFUNC_P (memfntype))
17600 memfntype = TYPE_PTRMEMFUNC_FN_TYPE (memfntype);
17601 if (INDIRECT_TYPE_P (memfntype)
17602 || TREE_CODE (memfntype) == FUNCTION_DECL)
17603 memfntype = TREE_TYPE (memfntype);
17604 if (TREE_CODE (memfntype) == FUNCTION_TYPE)
17605 return memfntype;
17606 gcc_assert (TREE_CODE (memfntype) == METHOD_TYPE);
17607 args = TYPE_ARG_TYPES (memfntype);
17608 fntype = build_function_type (TREE_TYPE (memfntype), TREE_CHAIN (args));
17609 fntype = apply_memfn_quals (fntype, type_memfn_quals (memfntype));
17610 fntype = (cp_build_type_attribute_variant
17611 (fntype, TYPE_ATTRIBUTES (memfntype)));
17612 fntype = cxx_copy_lang_qualifiers (fntype, memfntype);
17613 return fntype;
17614 }
17615
17616 /* DECL was originally constructed as a non-static member function,
17617 but turned out to be static. Update it accordingly. */
17618
17619 void
revert_static_member_fn(tree decl)17620 revert_static_member_fn (tree decl)
17621 {
17622 tree stype = static_fn_type (decl);
17623 cp_cv_quals quals = type_memfn_quals (stype);
17624 cp_ref_qualifier rqual = type_memfn_rqual (stype);
17625
17626 if (quals != TYPE_UNQUALIFIED || rqual != REF_QUAL_NONE)
17627 stype = apply_memfn_quals (stype, TYPE_UNQUALIFIED, REF_QUAL_NONE);
17628
17629 TREE_TYPE (decl) = stype;
17630
17631 if (DECL_ARGUMENTS (decl))
17632 DECL_ARGUMENTS (decl) = DECL_CHAIN (DECL_ARGUMENTS (decl));
17633 DECL_STATIC_FUNCTION_P (decl) = 1;
17634 }
17635
17636 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
17637 one of the language-independent trees. */
17638
17639 enum cp_tree_node_structure_enum
cp_tree_node_structure(union lang_tree_node * t)17640 cp_tree_node_structure (union lang_tree_node * t)
17641 {
17642 switch (TREE_CODE (&t->generic))
17643 {
17644 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
17645 case BASELINK: return TS_CP_BASELINK;
17646 case CONSTRAINT_INFO: return TS_CP_CONSTRAINT_INFO;
17647 case DEFERRED_NOEXCEPT: return TS_CP_DEFERRED_NOEXCEPT;
17648 case DEFERRED_PARSE: return TS_CP_DEFERRED_PARSE;
17649 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
17650 case LAMBDA_EXPR: return TS_CP_LAMBDA_EXPR;
17651 case OVERLOAD: return TS_CP_OVERLOAD;
17652 case PTRMEM_CST: return TS_CP_PTRMEM;
17653 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
17654 case TEMPLATE_DECL: return TS_CP_TEMPLATE_DECL;
17655 case TEMPLATE_INFO: return TS_CP_TEMPLATE_INFO;
17656 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
17657 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
17658 case USERDEF_LITERAL: return TS_CP_USERDEF_LITERAL;
17659 default: return TS_CP_GENERIC;
17660 }
17661 }
17662
17663 /* Build the void_list_node (void_type_node having been created). */
17664 tree
build_void_list_node(void)17665 build_void_list_node (void)
17666 {
17667 tree t = build_tree_list (NULL_TREE, void_type_node);
17668 return t;
17669 }
17670
17671 bool
cp_missing_noreturn_ok_p(tree decl)17672 cp_missing_noreturn_ok_p (tree decl)
17673 {
17674 /* A missing noreturn is ok for the `main' function. */
17675 return DECL_MAIN_P (decl);
17676 }
17677
17678 /* Return the decl used to identify the COMDAT group into which DECL should
17679 be placed. */
17680
17681 tree
cxx_comdat_group(tree decl)17682 cxx_comdat_group (tree decl)
17683 {
17684 /* Virtual tables, construction virtual tables, and virtual table
17685 tables all go in a single COMDAT group, named after the primary
17686 virtual table. */
17687 if (VAR_P (decl) && DECL_VTABLE_OR_VTT_P (decl))
17688 decl = CLASSTYPE_VTABLES (DECL_CONTEXT (decl));
17689 /* For all other DECLs, the COMDAT group is the mangled name of the
17690 declaration itself. */
17691 else
17692 {
17693 while (DECL_THUNK_P (decl))
17694 {
17695 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
17696 into the same section as the target function. In that case
17697 we must return target's name. */
17698 tree target = THUNK_TARGET (decl);
17699 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
17700 && DECL_SECTION_NAME (target) != NULL
17701 && DECL_ONE_ONLY (target))
17702 decl = target;
17703 else
17704 break;
17705 }
17706 }
17707
17708 return decl;
17709 }
17710
17711 /* Returns the return type for FN as written by the user, which may include
17712 a placeholder for a deduced return type. */
17713
17714 tree
fndecl_declared_return_type(tree fn)17715 fndecl_declared_return_type (tree fn)
17716 {
17717 fn = STRIP_TEMPLATE (fn);
17718 if (FNDECL_USED_AUTO (fn))
17719 return DECL_SAVED_AUTO_RETURN_TYPE (fn);
17720
17721 return TREE_TYPE (TREE_TYPE (fn));
17722 }
17723
17724 /* Returns true iff DECL is a variable or function declared with an auto type
17725 that has not yet been deduced to a real type. */
17726
17727 bool
undeduced_auto_decl(tree decl)17728 undeduced_auto_decl (tree decl)
17729 {
17730 if (cxx_dialect < cxx11)
17731 return false;
17732 STRIP_ANY_LOCATION_WRAPPER (decl);
17733 return ((VAR_OR_FUNCTION_DECL_P (decl)
17734 || TREE_CODE (decl) == TEMPLATE_DECL)
17735 && type_uses_auto (TREE_TYPE (decl)));
17736 }
17737
17738 /* Complain if DECL has an undeduced return type. */
17739
17740 bool
require_deduced_type(tree decl,tsubst_flags_t complain)17741 require_deduced_type (tree decl, tsubst_flags_t complain)
17742 {
17743 if (undeduced_auto_decl (decl))
17744 {
17745 if (TREE_NO_WARNING (decl) && seen_error ())
17746 /* We probably already complained about deduction failure. */;
17747 else if (complain & tf_error)
17748 error ("use of %qD before deduction of %<auto%>", decl);
17749 return false;
17750 }
17751 return true;
17752 }
17753
17754 /* Create a representation of the explicit-specifier with
17755 constant-expression of EXPR. COMPLAIN is as for tsubst. */
17756
17757 tree
build_explicit_specifier(tree expr,tsubst_flags_t complain)17758 build_explicit_specifier (tree expr, tsubst_flags_t complain)
17759 {
17760 if (instantiation_dependent_expression_p (expr))
17761 /* Wait for instantiation, tsubst_function_decl will handle it. */
17762 return expr;
17763
17764 expr = build_converted_constant_bool_expr (expr, complain);
17765 expr = instantiate_non_dependent_expr_sfinae (expr, complain);
17766 expr = cxx_constant_value (expr);
17767 return expr;
17768 }
17769
17770 #include "gt-cp-decl.h"
17771