PR c++/64359
[official-gcc.git] / gcc / cp / decl.c
blobbbaf3d68d9e757db46d3a27d4e363711feaddc3b
1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988-2014 Free Software Foundation, Inc.
3 Contributed by Michael Tiemann (tiemann@cygnus.com)
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3, or (at your option)
10 any later version.
12 GCC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
22 /* Process declarations and symbol lookup for C++ front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
29 #include "config.h"
30 #include "system.h"
31 #include "coretypes.h"
32 #include "tm.h"
33 #include "tree.h"
34 #include "tree-hasher.h"
35 #include "stringpool.h"
36 #include "stor-layout.h"
37 #include "varasm.h"
38 #include "attribs.h"
39 #include "calls.h"
40 #include "flags.h"
41 #include "cp-tree.h"
42 #include "tree-iterator.h"
43 #include "tree-inline.h"
44 #include "decl.h"
45 #include "intl.h"
46 #include "toplev.h"
47 #include "hashtab.h"
48 #include "tm_p.h"
49 #include "target.h"
50 #include "c-family/c-common.h"
51 #include "c-family/c-objc.h"
52 #include "c-family/c-pragma.h"
53 #include "c-family/c-target.h"
54 #include "c-family/c-ubsan.h"
55 #include "diagnostic.h"
56 #include "intl.h"
57 #include "debug.h"
58 #include "timevar.h"
59 #include "splay-tree.h"
60 #include "plugin.h"
61 #include "hash-map.h"
62 #include "is-a.h"
63 #include "plugin-api.h"
64 #include "vec.h"
65 #include "hash-set.h"
66 #include "machmode.h"
67 #include "hard-reg-set.h"
68 #include "input.h"
69 #include "function.h"
70 #include "ipa-ref.h"
71 #include "cgraph.h"
72 #include "cilk.h"
73 #include "wide-int.h"
74 #include "builtins.h"
76 /* Possible cases of bad specifiers type used by bad_specifiers. */
77 enum bad_spec_place {
78 BSP_VAR, /* variable */
79 BSP_PARM, /* parameter */
80 BSP_TYPE, /* type */
81 BSP_FIELD /* field */
84 static tree grokparms (tree parmlist, tree *);
85 static const char *redeclaration_error_message (tree, tree);
87 static int decl_jump_unsafe (tree);
88 static void require_complete_types_for_parms (tree);
89 static int ambi_op_p (enum tree_code);
90 static int unary_op_p (enum tree_code);
91 static void push_local_name (tree);
92 static tree grok_reference_init (tree, tree, tree, int);
93 static tree grokvardecl (tree, tree, tree, const cp_decl_specifier_seq *,
94 int, int, int, tree);
95 static int check_static_variable_definition (tree, tree);
96 static void record_unknown_type (tree, const char *);
97 static tree builtin_function_1 (tree, tree, bool);
98 static int member_function_or_else (tree, tree, enum overload_flags);
99 static void bad_specifiers (tree, enum bad_spec_place, int, int, int, int,
100 int);
101 static void check_for_uninitialized_const_var (tree);
102 static tree local_variable_p_walkfn (tree *, int *, void *);
103 static tree record_builtin_java_type (const char *, int);
104 static const char *tag_name (enum tag_types);
105 static tree lookup_and_check_tag (enum tag_types, tree, tag_scope, bool);
106 static int walk_namespaces_r (tree, walk_namespaces_fn, void *);
107 static void maybe_deduce_size_from_array_init (tree, tree);
108 static void layout_var_decl (tree);
109 static tree check_initializer (tree, tree, int, vec<tree, va_gc> **);
110 static void make_rtl_for_nonlocal_decl (tree, tree, const char *);
111 static void save_function_data (tree);
112 static void copy_type_enum (tree , tree);
113 static void check_function_type (tree, tree);
114 static void finish_constructor_body (void);
115 static void begin_destructor_body (void);
116 static void finish_destructor_body (void);
117 static void record_key_method_defined (tree);
118 static tree create_array_type_for_decl (tree, tree, tree);
119 static tree get_atexit_node (void);
120 static tree get_dso_handle_node (void);
121 static tree start_cleanup_fn (void);
122 static void end_cleanup_fn (void);
123 static tree cp_make_fname_decl (location_t, tree, int);
124 static void initialize_predefined_identifiers (void);
125 static tree check_special_function_return_type
126 (special_function_kind, tree, tree);
127 static tree push_cp_library_fn (enum tree_code, tree, int);
128 static tree build_cp_library_fn (tree, enum tree_code, tree, int);
129 static void store_parm_decls (tree);
130 static void initialize_local_var (tree, tree);
131 static void expand_static_init (tree, tree);
133 /* The following symbols are subsumed in the cp_global_trees array, and
134 listed here individually for documentation purposes.
136 C++ extensions
137 tree wchar_decl_node;
139 tree vtable_entry_type;
140 tree delta_type_node;
141 tree __t_desc_type_node;
143 tree class_type_node;
144 tree unknown_type_node;
146 Array type `vtable_entry_type[]'
148 tree vtbl_type_node;
149 tree vtbl_ptr_type_node;
151 Namespaces,
153 tree std_node;
154 tree abi_node;
156 A FUNCTION_DECL which can call `abort'. Not necessarily the
157 one that the user will declare, but sufficient to be called
158 by routines that want to abort the program.
160 tree abort_fndecl;
162 Used by RTTI
163 tree type_info_type_node, tinfo_decl_id, tinfo_decl_type;
164 tree tinfo_var_id; */
166 tree cp_global_trees[CPTI_MAX];
168 /* Indicates that there is a type value in some namespace, although
169 that is not necessarily in scope at the moment. */
171 tree global_type_node;
173 /* The node that holds the "name" of the global scope. */
174 tree global_scope_name;
176 #define local_names cp_function_chain->x_local_names
178 /* A list of objects which have constructors or destructors
179 which reside in the global scope. The decl is stored in
180 the TREE_VALUE slot and the initializer is stored
181 in the TREE_PURPOSE slot. */
182 tree static_aggregates;
184 /* Like static_aggregates, but for thread_local variables. */
185 tree tls_aggregates;
187 /* -- end of C++ */
189 /* A node for the integer constant 2. */
191 tree integer_two_node;
193 /* Used only for jumps to as-yet undefined labels, since jumps to
194 defined labels can have their validity checked immediately. */
196 struct GTY((chain_next ("%h.next"))) named_label_use_entry {
197 struct named_label_use_entry *next;
198 /* The binding level to which this entry is *currently* attached.
199 This is initially the binding level in which the goto appeared,
200 but is modified as scopes are closed. */
201 cp_binding_level *binding_level;
202 /* The head of the names list that was current when the goto appeared,
203 or the inner scope popped. These are the decls that will *not* be
204 skipped when jumping to the label. */
205 tree names_in_scope;
206 /* The location of the goto, for error reporting. */
207 location_t o_goto_locus;
208 /* True if an OpenMP structured block scope has been closed since
209 the goto appeared. This means that the branch from the label will
210 illegally exit an OpenMP scope. */
211 bool in_omp_scope;
214 /* A list of all LABEL_DECLs in the function that have names. Here so
215 we can clear out their names' definitions at the end of the
216 function, and so we can check the validity of jumps to these labels. */
218 struct GTY((for_user)) named_label_entry {
219 /* The decl itself. */
220 tree label_decl;
222 /* The binding level to which the label is *currently* attached.
223 This is initially set to the binding level in which the label
224 is defined, but is modified as scopes are closed. */
225 cp_binding_level *binding_level;
226 /* The head of the names list that was current when the label was
227 defined, or the inner scope popped. These are the decls that will
228 be skipped when jumping to the label. */
229 tree names_in_scope;
230 /* A vector of all decls from all binding levels that would be
231 crossed by a backward branch to the label. */
232 vec<tree, va_gc> *bad_decls;
234 /* A list of uses of the label, before the label is defined. */
235 struct named_label_use_entry *uses;
237 /* The following bits are set after the label is defined, and are
238 updated as scopes are popped. They indicate that a backward jump
239 to the label will illegally enter a scope of the given flavor. */
240 bool in_try_scope;
241 bool in_catch_scope;
242 bool in_omp_scope;
245 #define named_labels cp_function_chain->x_named_labels
247 /* The number of function bodies which we are currently processing.
248 (Zero if we are at namespace scope, one inside the body of a
249 function, two inside the body of a function in a local class, etc.) */
250 int function_depth;
252 /* To avoid unwanted recursion, finish_function defers all mark_used calls
253 encountered during its execution until it finishes. */
254 bool defer_mark_used_calls;
255 vec<tree, va_gc> *deferred_mark_used_calls;
257 /* States indicating how grokdeclarator() should handle declspecs marked
258 with __attribute__((deprecated)). An object declared as
259 __attribute__((deprecated)) suppresses warnings of uses of other
260 deprecated items. */
261 enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
264 /* A list of VAR_DECLs whose type was incomplete at the time the
265 variable was declared. */
267 typedef struct GTY(()) incomplete_var_d {
268 tree decl;
269 tree incomplete_type;
270 } incomplete_var;
273 static GTY(()) vec<incomplete_var, va_gc> *incomplete_vars;
275 /* Returns the kind of template specialization we are currently
276 processing, given that it's declaration contained N_CLASS_SCOPES
277 explicit scope qualifications. */
279 tmpl_spec_kind
280 current_tmpl_spec_kind (int n_class_scopes)
282 int n_template_parm_scopes = 0;
283 int seen_specialization_p = 0;
284 int innermost_specialization_p = 0;
285 cp_binding_level *b;
287 /* Scan through the template parameter scopes. */
288 for (b = current_binding_level;
289 b->kind == sk_template_parms;
290 b = b->level_chain)
292 /* If we see a specialization scope inside a parameter scope,
293 then something is wrong. That corresponds to a declaration
294 like:
296 template <class T> template <> ...
298 which is always invalid since [temp.expl.spec] forbids the
299 specialization of a class member template if the enclosing
300 class templates are not explicitly specialized as well. */
301 if (b->explicit_spec_p)
303 if (n_template_parm_scopes == 0)
304 innermost_specialization_p = 1;
305 else
306 seen_specialization_p = 1;
308 else if (seen_specialization_p == 1)
309 return tsk_invalid_member_spec;
311 ++n_template_parm_scopes;
314 /* Handle explicit instantiations. */
315 if (processing_explicit_instantiation)
317 if (n_template_parm_scopes != 0)
318 /* We've seen a template parameter list during an explicit
319 instantiation. For example:
321 template <class T> template void f(int);
323 This is erroneous. */
324 return tsk_invalid_expl_inst;
325 else
326 return tsk_expl_inst;
329 if (n_template_parm_scopes < n_class_scopes)
330 /* We've not seen enough template headers to match all the
331 specialized classes present. For example:
333 template <class T> void R<T>::S<T>::f(int);
335 This is invalid; there needs to be one set of template
336 parameters for each class. */
337 return tsk_insufficient_parms;
338 else if (n_template_parm_scopes == n_class_scopes)
339 /* We're processing a non-template declaration (even though it may
340 be a member of a template class.) For example:
342 template <class T> void S<T>::f(int);
344 The `class T' matches the `S<T>', leaving no template headers
345 corresponding to the `f'. */
346 return tsk_none;
347 else if (n_template_parm_scopes > n_class_scopes + 1)
348 /* We've got too many template headers. For example:
350 template <> template <class T> void f (T);
352 There need to be more enclosing classes. */
353 return tsk_excessive_parms;
354 else
355 /* This must be a template. It's of the form:
357 template <class T> template <class U> void S<T>::f(U);
359 This is a specialization if the innermost level was a
360 specialization; otherwise it's just a definition of the
361 template. */
362 return innermost_specialization_p ? tsk_expl_spec : tsk_template;
365 /* Exit the current scope. */
367 void
368 finish_scope (void)
370 poplevel (0, 0, 0);
373 /* When a label goes out of scope, check to see if that label was used
374 in a valid manner, and issue any appropriate warnings or errors. */
376 static void
377 pop_label (tree label, tree old_value)
379 if (!processing_template_decl)
381 if (DECL_INITIAL (label) == NULL_TREE)
383 location_t location;
385 error ("label %q+D used but not defined", label);
386 location = input_location;
387 /* FIXME want (LOCATION_FILE (input_location), (line)0) */
388 /* Avoid crashing later. */
389 define_label (location, DECL_NAME (label));
391 else
392 warn_for_unused_label (label);
395 SET_IDENTIFIER_LABEL_VALUE (DECL_NAME (label), old_value);
398 /* At the end of a function, all labels declared within the function
399 go out of scope. BLOCK is the top-level block for the
400 function. */
403 pop_labels_1 (named_label_entry **slot, tree block)
405 struct named_label_entry *ent = *slot;
407 pop_label (ent->label_decl, NULL_TREE);
409 /* Put the labels into the "variables" of the top-level block,
410 so debugger can see them. */
411 DECL_CHAIN (ent->label_decl) = BLOCK_VARS (block);
412 BLOCK_VARS (block) = ent->label_decl;
414 named_labels->clear_slot (slot);
416 return 1;
419 static void
420 pop_labels (tree block)
422 if (named_labels)
424 named_labels->traverse<tree, pop_labels_1> (block);
425 named_labels = NULL;
429 /* At the end of a block with local labels, restore the outer definition. */
431 static void
432 pop_local_label (tree label, tree old_value)
434 struct named_label_entry dummy;
436 pop_label (label, old_value);
438 dummy.label_decl = label;
439 named_label_entry **slot = named_labels->find_slot (&dummy, NO_INSERT);
440 named_labels->clear_slot (slot);
443 /* The following two routines are used to interface to Objective-C++.
444 The binding level is purposely treated as an opaque type. */
446 void *
447 objc_get_current_scope (void)
449 return current_binding_level;
452 /* The following routine is used by the NeXT-style SJLJ exceptions;
453 variables get marked 'volatile' so as to not be clobbered by
454 _setjmp()/_longjmp() calls. All variables in the current scope,
455 as well as parent scopes up to (but not including) ENCLOSING_BLK
456 shall be thusly marked. */
458 void
459 objc_mark_locals_volatile (void *enclosing_blk)
461 cp_binding_level *scope;
463 for (scope = current_binding_level;
464 scope && scope != enclosing_blk;
465 scope = scope->level_chain)
467 tree decl;
469 for (decl = scope->names; decl; decl = TREE_CHAIN (decl))
470 objc_volatilize_decl (decl);
472 /* Do not climb up past the current function. */
473 if (scope->kind == sk_function_parms)
474 break;
478 /* Update data for defined and undefined labels when leaving a scope. */
481 poplevel_named_label_1 (named_label_entry **slot, cp_binding_level *bl)
483 named_label_entry *ent = *slot;
484 cp_binding_level *obl = bl->level_chain;
486 if (ent->binding_level == bl)
488 tree decl;
490 /* ENT->NAMES_IN_SCOPE may contain a mixture of DECLs and
491 TREE_LISTs representing OVERLOADs, so be careful. */
492 for (decl = ent->names_in_scope; decl; decl = (DECL_P (decl)
493 ? DECL_CHAIN (decl)
494 : TREE_CHAIN (decl)))
495 if (decl_jump_unsafe (decl))
496 vec_safe_push (ent->bad_decls, decl);
498 ent->binding_level = obl;
499 ent->names_in_scope = obl->names;
500 switch (bl->kind)
502 case sk_try:
503 ent->in_try_scope = true;
504 break;
505 case sk_catch:
506 ent->in_catch_scope = true;
507 break;
508 case sk_omp:
509 ent->in_omp_scope = true;
510 break;
511 default:
512 break;
515 else if (ent->uses)
517 struct named_label_use_entry *use;
519 for (use = ent->uses; use ; use = use->next)
520 if (use->binding_level == bl)
522 use->binding_level = obl;
523 use->names_in_scope = obl->names;
524 if (bl->kind == sk_omp)
525 use->in_omp_scope = true;
529 return 1;
532 /* Saved errorcount to avoid -Wunused-but-set-{parameter,variable} warnings
533 when errors were reported, except for -Werror-unused-but-set-*. */
534 static int unused_but_set_errorcount;
536 /* Exit a binding level.
537 Pop the level off, and restore the state of the identifier-decl mappings
538 that were in effect when this level was entered.
540 If KEEP == 1, this level had explicit declarations, so
541 and create a "block" (a BLOCK node) for the level
542 to record its declarations and subblocks for symbol table output.
544 If FUNCTIONBODY is nonzero, this level is the body of a function,
545 so create a block as if KEEP were set and also clear out all
546 label names.
548 If REVERSE is nonzero, reverse the order of decls before putting
549 them into the BLOCK. */
551 tree
552 poplevel (int keep, int reverse, int functionbody)
554 tree link;
555 /* The chain of decls was accumulated in reverse order.
556 Put it into forward order, just for cleanliness. */
557 tree decls;
558 tree subblocks;
559 tree block;
560 tree decl;
561 int leaving_for_scope;
562 scope_kind kind;
563 unsigned ix;
564 cp_label_binding *label_bind;
566 bool subtime = timevar_cond_start (TV_NAME_LOOKUP);
567 restart:
569 block = NULL_TREE;
571 gcc_assert (current_binding_level->kind != sk_class);
573 if (current_binding_level->kind == sk_cleanup)
574 functionbody = 0;
575 subblocks = functionbody >= 0 ? current_binding_level->blocks : 0;
577 gcc_assert (!vec_safe_length (current_binding_level->class_shadowed));
579 /* We used to use KEEP == 2 to indicate that the new block should go
580 at the beginning of the list of blocks at this binding level,
581 rather than the end. This hack is no longer used. */
582 gcc_assert (keep == 0 || keep == 1);
584 if (current_binding_level->keep)
585 keep = 1;
587 /* Any uses of undefined labels, and any defined labels, now operate
588 under constraints of next binding contour. */
589 if (cfun && !functionbody && named_labels)
590 named_labels->traverse<cp_binding_level *, poplevel_named_label_1>
591 (current_binding_level);
593 /* Get the decls in the order they were written.
594 Usually current_binding_level->names is in reverse order.
595 But parameter decls were previously put in forward order. */
597 if (reverse)
598 current_binding_level->names
599 = decls = nreverse (current_binding_level->names);
600 else
601 decls = current_binding_level->names;
603 /* If there were any declarations or structure tags in that level,
604 or if this level is a function body,
605 create a BLOCK to record them for the life of this function. */
606 block = NULL_TREE;
607 if (keep == 1 || functionbody)
608 block = make_node (BLOCK);
609 if (block != NULL_TREE)
611 BLOCK_VARS (block) = decls;
612 BLOCK_SUBBLOCKS (block) = subblocks;
615 /* In each subblock, record that this is its superior. */
616 if (keep >= 0)
617 for (link = subblocks; link; link = BLOCK_CHAIN (link))
618 BLOCK_SUPERCONTEXT (link) = block;
620 /* We still support the old for-scope rules, whereby the variables
621 in a for-init statement were in scope after the for-statement
622 ended. We only use the new rules if flag_new_for_scope is
623 nonzero. */
624 leaving_for_scope
625 = current_binding_level->kind == sk_for && flag_new_for_scope == 1;
627 /* Before we remove the declarations first check for unused variables. */
628 if ((warn_unused_variable || warn_unused_but_set_variable)
629 && current_binding_level->kind != sk_template_parms
630 && !processing_template_decl)
631 for (tree d = getdecls (); d; d = TREE_CHAIN (d))
633 /* There are cases where D itself is a TREE_LIST. See in
634 push_local_binding where the list of decls returned by
635 getdecls is built. */
636 decl = TREE_CODE (d) == TREE_LIST ? TREE_VALUE (d) : d;
637 tree type = TREE_TYPE (decl);
638 if (VAR_P (decl)
639 && (! TREE_USED (decl) || !DECL_READ_P (decl))
640 && ! DECL_IN_SYSTEM_HEADER (decl)
641 && DECL_NAME (decl) && ! DECL_ARTIFICIAL (decl)
642 && type != error_mark_node
643 && (!CLASS_TYPE_P (type)
644 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
645 || lookup_attribute ("warn_unused",
646 TYPE_ATTRIBUTES (TREE_TYPE (decl)))))
648 if (! TREE_USED (decl))
649 warning (OPT_Wunused_variable, "unused variable %q+D", decl);
650 else if (DECL_CONTEXT (decl) == current_function_decl
651 // For -Wunused-but-set-variable leave references alone.
652 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
653 && errorcount == unused_but_set_errorcount)
655 warning (OPT_Wunused_but_set_variable,
656 "variable %q+D set but not used", decl);
657 unused_but_set_errorcount = errorcount;
662 /* Remove declarations for all the DECLs in this level. */
663 for (link = decls; link; link = TREE_CHAIN (link))
665 if (leaving_for_scope && VAR_P (link)
666 /* It's hard to make this ARM compatibility hack play nicely with
667 lambdas, and it really isn't necessary in C++11 mode. */
668 && cxx_dialect < cxx11
669 && DECL_NAME (link))
671 tree name = DECL_NAME (link);
672 cxx_binding *ob;
673 tree ns_binding;
675 ob = outer_binding (name,
676 IDENTIFIER_BINDING (name),
677 /*class_p=*/true);
678 if (!ob)
679 ns_binding = IDENTIFIER_NAMESPACE_VALUE (name);
680 else
681 ns_binding = NULL_TREE;
683 if (ob && ob->scope == current_binding_level->level_chain)
684 /* We have something like:
686 int i;
687 for (int i; ;);
689 and we are leaving the `for' scope. There's no reason to
690 keep the binding of the inner `i' in this case. */
691 pop_binding (name, link);
692 else if ((ob && (TREE_CODE (ob->value) == TYPE_DECL))
693 || (ns_binding && TREE_CODE (ns_binding) == TYPE_DECL))
694 /* Here, we have something like:
696 typedef int I;
698 void f () {
699 for (int I; ;);
702 We must pop the for-scope binding so we know what's a
703 type and what isn't. */
704 pop_binding (name, link);
705 else
707 /* Mark this VAR_DECL as dead so that we can tell we left it
708 there only for backward compatibility. */
709 DECL_DEAD_FOR_LOCAL (link) = 1;
711 /* Keep track of what should have happened when we
712 popped the binding. */
713 if (ob && ob->value)
715 SET_DECL_SHADOWED_FOR_VAR (link, ob->value);
716 DECL_HAS_SHADOWED_FOR_VAR_P (link) = 1;
719 /* Add it to the list of dead variables in the next
720 outermost binding to that we can remove these when we
721 leave that binding. */
722 vec_safe_push (
723 current_binding_level->level_chain->dead_vars_from_for,
724 link);
726 /* Although we don't pop the cxx_binding, we do clear
727 its SCOPE since the scope is going away now. */
728 IDENTIFIER_BINDING (name)->scope
729 = current_binding_level->level_chain;
732 else
734 tree name;
736 /* Remove the binding. */
737 decl = link;
739 if (TREE_CODE (decl) == TREE_LIST)
740 decl = TREE_VALUE (decl);
741 name = decl;
743 if (TREE_CODE (name) == OVERLOAD)
744 name = OVL_FUNCTION (name);
746 gcc_assert (DECL_P (name));
747 pop_binding (DECL_NAME (name), decl);
751 /* Remove declarations for any `for' variables from inner scopes
752 that we kept around. */
753 FOR_EACH_VEC_SAFE_ELT_REVERSE (current_binding_level->dead_vars_from_for,
754 ix, decl)
755 pop_binding (DECL_NAME (decl), decl);
757 /* Restore the IDENTIFIER_TYPE_VALUEs. */
758 for (link = current_binding_level->type_shadowed;
759 link; link = TREE_CHAIN (link))
760 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (link), TREE_VALUE (link));
762 /* Restore the IDENTIFIER_LABEL_VALUEs for local labels. */
763 FOR_EACH_VEC_SAFE_ELT_REVERSE (current_binding_level->shadowed_labels,
764 ix, label_bind)
765 pop_local_label (label_bind->label, label_bind->prev_value);
767 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
768 list if a `using' declaration put them there. The debugging
769 back ends won't understand OVERLOAD, so we remove them here.
770 Because the BLOCK_VARS are (temporarily) shared with
771 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
772 popped all the bindings. */
773 if (block)
775 tree* d;
777 for (d = &BLOCK_VARS (block); *d; )
779 if (TREE_CODE (*d) == TREE_LIST)
780 *d = TREE_CHAIN (*d);
781 else
782 d = &DECL_CHAIN (*d);
786 /* If the level being exited is the top level of a function,
787 check over all the labels. */
788 if (functionbody)
790 /* Since this is the top level block of a function, the vars are
791 the function's parameters. Don't leave them in the BLOCK
792 because they are found in the FUNCTION_DECL instead. */
793 BLOCK_VARS (block) = 0;
794 pop_labels (block);
797 kind = current_binding_level->kind;
798 if (kind == sk_cleanup)
800 tree stmt;
802 /* If this is a temporary binding created for a cleanup, then we'll
803 have pushed a statement list level. Pop that, create a new
804 BIND_EXPR for the block, and insert it into the stream. */
805 stmt = pop_stmt_list (current_binding_level->statement_list);
806 stmt = c_build_bind_expr (input_location, block, stmt);
807 add_stmt (stmt);
810 leave_scope ();
811 if (functionbody)
813 /* The current function is being defined, so its DECL_INITIAL
814 should be error_mark_node. */
815 gcc_assert (DECL_INITIAL (current_function_decl) == error_mark_node);
816 DECL_INITIAL (current_function_decl) = block;
818 else if (block)
819 current_binding_level->blocks
820 = block_chainon (current_binding_level->blocks, block);
822 /* If we did not make a block for the level just exited,
823 any blocks made for inner levels
824 (since they cannot be recorded as subblocks in that level)
825 must be carried forward so they will later become subblocks
826 of something else. */
827 else if (subblocks)
828 current_binding_level->blocks
829 = block_chainon (current_binding_level->blocks, subblocks);
831 /* Each and every BLOCK node created here in `poplevel' is important
832 (e.g. for proper debugging information) so if we created one
833 earlier, mark it as "used". */
834 if (block)
835 TREE_USED (block) = 1;
837 /* All temporary bindings created for cleanups are popped silently. */
838 if (kind == sk_cleanup)
839 goto restart;
841 timevar_cond_stop (TV_NAME_LOOKUP, subtime);
842 return block;
845 /* Walk all the namespaces contained NAMESPACE, including NAMESPACE
846 itself, calling F for each. The DATA is passed to F as well. */
848 static int
849 walk_namespaces_r (tree name_space, walk_namespaces_fn f, void* data)
851 int result = 0;
852 tree current = NAMESPACE_LEVEL (name_space)->namespaces;
854 result |= (*f) (name_space, data);
856 for (; current; current = DECL_CHAIN (current))
857 result |= walk_namespaces_r (current, f, data);
859 return result;
862 /* Walk all the namespaces, calling F for each. The DATA is passed to
863 F as well. */
866 walk_namespaces (walk_namespaces_fn f, void* data)
868 return walk_namespaces_r (global_namespace, f, data);
871 /* Call wrapup_globals_declarations for the globals in NAMESPACE. If
872 DATA is non-NULL, this is the last time we will call
873 wrapup_global_declarations for this NAMESPACE. */
876 wrapup_globals_for_namespace (tree name_space, void* data)
878 cp_binding_level *level = NAMESPACE_LEVEL (name_space);
879 vec<tree, va_gc> *statics = level->static_decls;
880 tree *vec = statics->address ();
881 int len = statics->length ();
882 int last_time = (data != 0);
884 if (last_time)
886 check_global_declarations (vec, len);
887 emit_debug_global_declarations (vec, len);
888 return 0;
891 /* Write out any globals that need to be output. */
892 return wrapup_global_declarations (vec, len);
896 /* In C++, you don't have to write `struct S' to refer to `S'; you
897 can just use `S'. We accomplish this by creating a TYPE_DECL as
898 if the user had written `typedef struct S S'. Create and return
899 the TYPE_DECL for TYPE. */
901 tree
902 create_implicit_typedef (tree name, tree type)
904 tree decl;
906 decl = build_decl (input_location, TYPE_DECL, name, type);
907 DECL_ARTIFICIAL (decl) = 1;
908 /* There are other implicit type declarations, like the one *within*
909 a class that allows you to write `S::S'. We must distinguish
910 amongst these. */
911 SET_DECL_IMPLICIT_TYPEDEF_P (decl);
912 TYPE_NAME (type) = decl;
913 TYPE_STUB_DECL (type) = decl;
915 return decl;
918 /* Remember a local name for name-mangling purposes. */
920 static void
921 push_local_name (tree decl)
923 size_t i, nelts;
924 tree t, name;
926 timevar_start (TV_NAME_LOOKUP);
928 name = DECL_NAME (decl);
930 nelts = vec_safe_length (local_names);
931 for (i = 0; i < nelts; i++)
933 t = (*local_names)[i];
934 if (DECL_NAME (t) == name)
936 if (!DECL_LANG_SPECIFIC (decl))
937 retrofit_lang_decl (decl);
938 DECL_LANG_SPECIFIC (decl)->u.base.u2sel = 1;
939 if (DECL_DISCRIMINATOR_SET_P (t))
940 DECL_DISCRIMINATOR (decl) = DECL_DISCRIMINATOR (t) + 1;
941 else
942 DECL_DISCRIMINATOR (decl) = 1;
944 (*local_names)[i] = decl;
945 timevar_stop (TV_NAME_LOOKUP);
946 return;
950 vec_safe_push (local_names, decl);
951 timevar_stop (TV_NAME_LOOKUP);
954 /* Subroutine of duplicate_decls: return truthvalue of whether
955 or not types of these decls match.
957 For C++, we must compare the parameter list so that `int' can match
958 `int&' in a parameter position, but `int&' is not confused with
959 `const int&'. */
962 decls_match (tree newdecl, tree olddecl)
964 int types_match;
966 if (newdecl == olddecl)
967 return 1;
969 if (TREE_CODE (newdecl) != TREE_CODE (olddecl))
970 /* If the two DECLs are not even the same kind of thing, we're not
971 interested in their types. */
972 return 0;
974 gcc_assert (DECL_P (newdecl));
976 if (TREE_CODE (newdecl) == FUNCTION_DECL)
978 tree f1 = TREE_TYPE (newdecl);
979 tree f2 = TREE_TYPE (olddecl);
980 tree p1 = TYPE_ARG_TYPES (f1);
981 tree p2 = TYPE_ARG_TYPES (f2);
982 tree r2;
984 /* Specializations of different templates are different functions
985 even if they have the same type. */
986 tree t1 = (DECL_USE_TEMPLATE (newdecl)
987 ? DECL_TI_TEMPLATE (newdecl)
988 : NULL_TREE);
989 tree t2 = (DECL_USE_TEMPLATE (olddecl)
990 ? DECL_TI_TEMPLATE (olddecl)
991 : NULL_TREE);
992 if (t1 != t2)
993 return 0;
995 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
996 && ! (DECL_EXTERN_C_P (newdecl)
997 && DECL_EXTERN_C_P (olddecl)))
998 return 0;
1000 /* A new declaration doesn't match a built-in one unless it
1001 is also extern "C". */
1002 if (DECL_IS_BUILTIN (olddecl)
1003 && DECL_EXTERN_C_P (olddecl) && !DECL_EXTERN_C_P (newdecl))
1004 return 0;
1006 if (TREE_CODE (f1) != TREE_CODE (f2))
1007 return 0;
1009 /* A declaration with deduced return type should use its pre-deduction
1010 type for declaration matching. */
1011 r2 = fndecl_declared_return_type (olddecl);
1013 if (same_type_p (TREE_TYPE (f1), r2))
1015 if (!prototype_p (f2) && DECL_EXTERN_C_P (olddecl)
1016 && (DECL_BUILT_IN (olddecl)
1017 #ifndef NO_IMPLICIT_EXTERN_C
1018 || (DECL_IN_SYSTEM_HEADER (newdecl) && !DECL_CLASS_SCOPE_P (newdecl))
1019 || (DECL_IN_SYSTEM_HEADER (olddecl) && !DECL_CLASS_SCOPE_P (olddecl))
1020 #endif
1023 types_match = self_promoting_args_p (p1);
1024 if (p1 == void_list_node)
1025 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
1027 #ifndef NO_IMPLICIT_EXTERN_C
1028 else if (!prototype_p (f1)
1029 && (DECL_EXTERN_C_P (olddecl)
1030 && DECL_IN_SYSTEM_HEADER (olddecl)
1031 && !DECL_CLASS_SCOPE_P (olddecl))
1032 && (DECL_EXTERN_C_P (newdecl)
1033 && DECL_IN_SYSTEM_HEADER (newdecl)
1034 && !DECL_CLASS_SCOPE_P (newdecl)))
1036 types_match = self_promoting_args_p (p2);
1037 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
1039 #endif
1040 else
1041 types_match =
1042 compparms (p1, p2)
1043 && type_memfn_rqual (f1) == type_memfn_rqual (f2)
1044 && (TYPE_ATTRIBUTES (TREE_TYPE (newdecl)) == NULL_TREE
1045 || comp_type_attributes (TREE_TYPE (newdecl),
1046 TREE_TYPE (olddecl)) != 0);
1048 else
1049 types_match = 0;
1051 /* The decls dont match if they correspond to two different versions
1052 of the same function. Disallow extern "C" functions to be
1053 versions for now. */
1054 if (types_match
1055 && !DECL_EXTERN_C_P (newdecl)
1056 && !DECL_EXTERN_C_P (olddecl)
1057 && targetm.target_option.function_versions (newdecl, olddecl))
1059 /* Mark functions as versions if necessary. Modify the mangled decl
1060 name if necessary. */
1061 if (DECL_FUNCTION_VERSIONED (newdecl)
1062 && DECL_FUNCTION_VERSIONED (olddecl))
1063 return 0;
1064 if (!DECL_FUNCTION_VERSIONED (newdecl))
1066 DECL_FUNCTION_VERSIONED (newdecl) = 1;
1067 if (DECL_ASSEMBLER_NAME_SET_P (newdecl))
1068 mangle_decl (newdecl);
1070 if (!DECL_FUNCTION_VERSIONED (olddecl))
1072 DECL_FUNCTION_VERSIONED (olddecl) = 1;
1073 if (DECL_ASSEMBLER_NAME_SET_P (olddecl))
1074 mangle_decl (olddecl);
1076 cgraph_node::record_function_versions (olddecl, newdecl);
1077 return 0;
1080 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1082 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl))
1083 != TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)))
1084 return 0;
1086 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1087 DECL_TEMPLATE_PARMS (olddecl)))
1088 return 0;
1090 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1091 types_match = same_type_p (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl)),
1092 TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl)));
1093 else
1094 types_match = decls_match (DECL_TEMPLATE_RESULT (olddecl),
1095 DECL_TEMPLATE_RESULT (newdecl));
1097 else
1099 /* Need to check scope for variable declaration (VAR_DECL).
1100 For typedef (TYPE_DECL), scope is ignored. */
1101 if (VAR_P (newdecl)
1102 && CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
1103 /* [dcl.link]
1104 Two declarations for an object with C language linkage
1105 with the same name (ignoring the namespace that qualify
1106 it) that appear in different namespace scopes refer to
1107 the same object. */
1108 && !(DECL_EXTERN_C_P (olddecl) && DECL_EXTERN_C_P (newdecl)))
1109 return 0;
1111 if (TREE_TYPE (newdecl) == error_mark_node)
1112 types_match = TREE_TYPE (olddecl) == error_mark_node;
1113 else if (TREE_TYPE (olddecl) == NULL_TREE)
1114 types_match = TREE_TYPE (newdecl) == NULL_TREE;
1115 else if (TREE_TYPE (newdecl) == NULL_TREE)
1116 types_match = 0;
1117 else
1118 types_match = comptypes (TREE_TYPE (newdecl),
1119 TREE_TYPE (olddecl),
1120 COMPARE_REDECLARATION);
1123 return types_match;
1126 /* If NEWDECL is `static' and an `extern' was seen previously,
1127 warn about it. OLDDECL is the previous declaration.
1129 Note that this does not apply to the C++ case of declaring
1130 a variable `extern const' and then later `const'.
1132 Don't complain about built-in functions, since they are beyond
1133 the user's control. */
1135 void
1136 warn_extern_redeclared_static (tree newdecl, tree olddecl)
1138 if (TREE_CODE (newdecl) == TYPE_DECL
1139 || TREE_CODE (newdecl) == TEMPLATE_DECL
1140 || TREE_CODE (newdecl) == CONST_DECL
1141 || TREE_CODE (newdecl) == NAMESPACE_DECL)
1142 return;
1144 /* Don't get confused by static member functions; that's a different
1145 use of `static'. */
1146 if (TREE_CODE (newdecl) == FUNCTION_DECL
1147 && DECL_STATIC_FUNCTION_P (newdecl))
1148 return;
1150 /* If the old declaration was `static', or the new one isn't, then
1151 everything is OK. */
1152 if (DECL_THIS_STATIC (olddecl) || !DECL_THIS_STATIC (newdecl))
1153 return;
1155 /* It's OK to declare a builtin function as `static'. */
1156 if (TREE_CODE (olddecl) == FUNCTION_DECL
1157 && DECL_ARTIFICIAL (olddecl))
1158 return;
1160 if (permerror (input_location,
1161 "%qD was declared %<extern%> and later %<static%>", newdecl))
1162 inform (input_location, "previous declaration of %q+D", olddecl);
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. */
1169 static void
1170 check_redeclaration_exception_specification (tree new_decl,
1171 tree old_decl)
1173 tree new_exceptions = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (new_decl));
1174 tree old_exceptions = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (old_decl));
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;
1181 maybe_instantiate_noexcept (new_decl);
1182 maybe_instantiate_noexcept (old_decl);
1183 new_exceptions = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (new_decl));
1184 old_exceptions = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (old_decl));
1186 /* [except.spec]
1188 If any declaration of a function has an exception-specification,
1189 all declarations, including the definition and an explicit
1190 specialization, of that function shall have an
1191 exception-specification with the same set of type-ids. */
1192 if ((pedantic || ! DECL_IN_SYSTEM_HEADER (old_decl))
1193 && ! DECL_IS_BUILTIN (old_decl)
1194 && flag_exceptions
1195 && !comp_except_specs (new_exceptions, old_exceptions, ce_normal))
1197 error ("declaration of %qF has a different exception specifier",
1198 new_decl);
1199 error ("from previous declaration %q+F", old_decl);
1203 /* Return true if OLD_DECL and NEW_DECL agree on constexprness.
1204 Otherwise issue diagnostics. */
1206 static bool
1207 validate_constexpr_redeclaration (tree old_decl, tree new_decl)
1209 old_decl = STRIP_TEMPLATE (old_decl);
1210 new_decl = STRIP_TEMPLATE (new_decl);
1211 if (!VAR_OR_FUNCTION_DECL_P (old_decl)
1212 || !VAR_OR_FUNCTION_DECL_P (new_decl))
1213 return true;
1214 if (DECL_DECLARED_CONSTEXPR_P (old_decl)
1215 == DECL_DECLARED_CONSTEXPR_P (new_decl))
1216 return true;
1217 if (TREE_CODE (old_decl) == FUNCTION_DECL)
1219 if (DECL_BUILT_IN (old_decl))
1221 /* Hide a built-in declaration. */
1222 DECL_DECLARED_CONSTEXPR_P (old_decl)
1223 = DECL_DECLARED_CONSTEXPR_P (new_decl);
1224 return true;
1226 /* 7.1.5 [dcl.constexpr]
1227 Note: An explicit specialization can differ from the template
1228 declaration with respect to the constexpr specifier. */
1229 if (! DECL_TEMPLATE_SPECIALIZATION (old_decl)
1230 && DECL_TEMPLATE_SPECIALIZATION (new_decl))
1231 return true;
1233 error ("redeclaration %qD differs in %<constexpr%>", new_decl);
1234 error ("from previous declaration %q+D", old_decl);
1235 return false;
1237 return true;
1240 /* DECL is a redeclaration of a function or function template. If
1241 it does have default arguments issue a diagnostic. Note: this
1242 function is used to enforce the requirements in C++11 8.3.6 about
1243 no default arguments in redeclarations. */
1245 static void
1246 check_redeclaration_no_default_args (tree decl)
1248 gcc_assert (DECL_DECLARES_FUNCTION_P (decl));
1250 for (tree t = FUNCTION_FIRST_USER_PARMTYPE (decl);
1251 t && t != void_list_node; t = TREE_CHAIN (t))
1252 if (TREE_PURPOSE (t))
1254 permerror (input_location,
1255 "redeclaration of %q#D may not have default "
1256 "arguments", decl);
1257 return;
1261 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1262 && lookup_attribute ("gnu_inline", \
1263 DECL_ATTRIBUTES (fn)))
1265 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1266 If the redeclaration is invalid, a diagnostic is issued, and the
1267 error_mark_node is returned. Otherwise, OLDDECL is returned.
1269 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1270 returned.
1272 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1274 tree
1275 duplicate_decls (tree newdecl, tree olddecl, bool newdecl_is_friend)
1277 unsigned olddecl_uid = DECL_UID (olddecl);
1278 int olddecl_friend = 0, types_match = 0, hidden_friend = 0;
1279 int new_defines_function = 0;
1280 tree new_template_info;
1282 if (newdecl == olddecl)
1283 return olddecl;
1285 types_match = decls_match (newdecl, olddecl);
1287 /* If either the type of the new decl or the type of the old decl is an
1288 error_mark_node, then that implies that we have already issued an
1289 error (earlier) for some bogus type specification, and in that case,
1290 it is rather pointless to harass the user with yet more error message
1291 about the same declaration, so just pretend the types match here. */
1292 if (TREE_TYPE (newdecl) == error_mark_node
1293 || TREE_TYPE (olddecl) == error_mark_node)
1294 return error_mark_node;
1296 if (UDLIT_OPER_P (DECL_NAME (newdecl))
1297 && UDLIT_OPER_P (DECL_NAME (olddecl)))
1299 if (TREE_CODE (newdecl) == TEMPLATE_DECL
1300 && TREE_CODE (olddecl) != TEMPLATE_DECL
1301 && check_raw_literal_operator (olddecl))
1302 error ("literal operator template %q+D conflicts with"
1303 " raw literal operator %qD", newdecl, olddecl);
1304 else if (TREE_CODE (newdecl) != TEMPLATE_DECL
1305 && TREE_CODE (olddecl) == TEMPLATE_DECL
1306 && check_raw_literal_operator (newdecl))
1307 error ("raw literal operator %q+D conflicts with"
1308 " literal operator template %qD", newdecl, olddecl);
1311 if (DECL_P (olddecl)
1312 && TREE_CODE (newdecl) == FUNCTION_DECL
1313 && TREE_CODE (olddecl) == FUNCTION_DECL
1314 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1316 if (DECL_DECLARED_INLINE_P (newdecl)
1317 && DECL_UNINLINABLE (newdecl)
1318 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1319 /* Already warned elsewhere. */;
1320 else if (DECL_DECLARED_INLINE_P (olddecl)
1321 && DECL_UNINLINABLE (olddecl)
1322 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1323 /* Already warned. */;
1324 else if (DECL_DECLARED_INLINE_P (newdecl)
1325 && DECL_UNINLINABLE (olddecl)
1326 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1328 if (warning (OPT_Wattributes, "function %q+D redeclared as inline",
1329 newdecl))
1330 inform (DECL_SOURCE_LOCATION (olddecl),
1331 "previous declaration of %qD with attribute noinline",
1332 olddecl);
1334 else if (DECL_DECLARED_INLINE_P (olddecl)
1335 && DECL_UNINLINABLE (newdecl)
1336 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1338 if (warning (OPT_Wattributes, "function %q+D redeclared with "
1339 "attribute noinline", newdecl))
1340 inform (DECL_SOURCE_LOCATION (olddecl),
1341 "previous declaration of %qD was inline",
1342 olddecl);
1346 /* Check for redeclaration and other discrepancies. */
1347 if (TREE_CODE (olddecl) == FUNCTION_DECL
1348 && DECL_ARTIFICIAL (olddecl))
1350 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl));
1351 if (TREE_CODE (newdecl) != FUNCTION_DECL)
1353 /* Avoid warnings redeclaring built-ins which have not been
1354 explicitly declared. */
1355 if (DECL_ANTICIPATED (olddecl))
1356 return NULL_TREE;
1358 /* If you declare a built-in or predefined function name as static,
1359 the old definition is overridden, but optionally warn this was a
1360 bad choice of name. */
1361 if (! TREE_PUBLIC (newdecl))
1363 warning (OPT_Wshadow,
1364 DECL_BUILT_IN (olddecl)
1365 ? G_("shadowing built-in function %q#D")
1366 : G_("shadowing library function %q#D"), olddecl);
1367 /* Discard the old built-in function. */
1368 return NULL_TREE;
1370 /* If the built-in is not ansi, then programs can override
1371 it even globally without an error. */
1372 else if (! DECL_BUILT_IN (olddecl))
1373 warning (0, "library function %q#D redeclared as non-function %q#D",
1374 olddecl, newdecl);
1375 else
1376 error ("declaration of %q#D conflicts with built-in "
1377 "declaration %q#D", newdecl, olddecl);
1378 return NULL_TREE;
1380 else if (DECL_OMP_DECLARE_REDUCTION_P (olddecl))
1382 gcc_assert (DECL_OMP_DECLARE_REDUCTION_P (newdecl));
1383 error_at (DECL_SOURCE_LOCATION (newdecl),
1384 "redeclaration of %<pragma omp declare reduction%>");
1385 inform (DECL_SOURCE_LOCATION (olddecl),
1386 "previous %<pragma omp declare reduction%> declaration");
1387 return error_mark_node;
1389 else if (!types_match)
1391 /* Avoid warnings redeclaring built-ins which have not been
1392 explicitly declared. */
1393 if (DECL_ANTICIPATED (olddecl))
1395 /* Deal with fileptr_type_node. FILE type is not known
1396 at the time we create the builtins. */
1397 tree t1, t2;
1399 for (t1 = TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1400 t2 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1401 t1 || t2;
1402 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1403 if (!t1 || !t2)
1404 break;
1405 else if (TREE_VALUE (t2) == fileptr_type_node)
1407 tree t = TREE_VALUE (t1);
1409 if (TYPE_PTR_P (t)
1410 && TYPE_IDENTIFIER (TREE_TYPE (t))
1411 == get_identifier ("FILE")
1412 && compparms (TREE_CHAIN (t1), TREE_CHAIN (t2)))
1414 tree oldargs = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1416 TYPE_ARG_TYPES (TREE_TYPE (olddecl))
1417 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1418 types_match = decls_match (newdecl, olddecl);
1419 if (types_match)
1420 return duplicate_decls (newdecl, olddecl,
1421 newdecl_is_friend);
1422 TYPE_ARG_TYPES (TREE_TYPE (olddecl)) = oldargs;
1425 else if (! same_type_p (TREE_VALUE (t1), TREE_VALUE (t2)))
1426 break;
1428 else if ((DECL_EXTERN_C_P (newdecl)
1429 && DECL_EXTERN_C_P (olddecl))
1430 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1431 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1433 /* A near match; override the builtin. */
1435 if (TREE_PUBLIC (newdecl))
1436 warning (0, "new declaration %q#D ambiguates built-in "
1437 "declaration %q#D", newdecl, olddecl);
1438 else
1439 warning (OPT_Wshadow,
1440 DECL_BUILT_IN (olddecl)
1441 ? G_("shadowing built-in function %q#D")
1442 : G_("shadowing library function %q#D"), olddecl);
1444 else
1445 /* Discard the old built-in function. */
1446 return NULL_TREE;
1448 /* Replace the old RTL to avoid problems with inlining. */
1449 COPY_DECL_RTL (newdecl, olddecl);
1451 /* Even if the types match, prefer the new declarations type for
1452 built-ins which have not been explicitly declared, for
1453 exception lists, etc... */
1454 else if (DECL_IS_BUILTIN (olddecl))
1456 tree type = TREE_TYPE (newdecl);
1457 tree attribs = (*targetm.merge_type_attributes)
1458 (TREE_TYPE (olddecl), type);
1460 type = cp_build_type_attribute_variant (type, attribs);
1461 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = type;
1464 /* If a function is explicitly declared "throw ()", propagate that to
1465 the corresponding builtin. */
1466 if (DECL_BUILT_IN_CLASS (olddecl) == BUILT_IN_NORMAL
1467 && DECL_ANTICIPATED (olddecl)
1468 && TREE_NOTHROW (newdecl)
1469 && !TREE_NOTHROW (olddecl))
1471 enum built_in_function fncode = DECL_FUNCTION_CODE (olddecl);
1472 tree tmpdecl = builtin_decl_explicit (fncode);
1473 if (tmpdecl && tmpdecl != olddecl && types_match)
1474 TREE_NOTHROW (tmpdecl) = 1;
1477 /* Whether or not the builtin can throw exceptions has no
1478 bearing on this declarator. */
1479 TREE_NOTHROW (olddecl) = 0;
1481 if (DECL_THIS_STATIC (newdecl) && !DECL_THIS_STATIC (olddecl))
1483 /* If a builtin function is redeclared as `static', merge
1484 the declarations, but make the original one static. */
1485 DECL_THIS_STATIC (olddecl) = 1;
1486 TREE_PUBLIC (olddecl) = 0;
1488 /* Make the old declaration consistent with the new one so
1489 that all remnants of the builtin-ness of this function
1490 will be banished. */
1491 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1492 COPY_DECL_RTL (newdecl, olddecl);
1495 else if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1497 /* C++ Standard, 3.3, clause 4:
1498 "[Note: a namespace name or a class template name must be unique
1499 in its declarative region (7.3.2, clause 14). ]" */
1500 if (TREE_CODE (olddecl) != NAMESPACE_DECL
1501 && TREE_CODE (newdecl) != NAMESPACE_DECL
1502 && (TREE_CODE (olddecl) != TEMPLATE_DECL
1503 || TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) != TYPE_DECL)
1504 && (TREE_CODE (newdecl) != TEMPLATE_DECL
1505 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != TYPE_DECL))
1507 if ((TREE_CODE (olddecl) == TYPE_DECL && DECL_ARTIFICIAL (olddecl)
1508 && TREE_CODE (newdecl) != TYPE_DECL)
1509 || (TREE_CODE (newdecl) == TYPE_DECL && DECL_ARTIFICIAL (newdecl)
1510 && TREE_CODE (olddecl) != TYPE_DECL))
1512 /* We do nothing special here, because C++ does such nasty
1513 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1514 get shadowed, and know that if we need to find a TYPE_DECL
1515 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1516 slot of the identifier. */
1517 return NULL_TREE;
1520 if ((TREE_CODE (newdecl) == FUNCTION_DECL
1521 && DECL_FUNCTION_TEMPLATE_P (olddecl))
1522 || (TREE_CODE (olddecl) == FUNCTION_DECL
1523 && DECL_FUNCTION_TEMPLATE_P (newdecl)))
1524 return NULL_TREE;
1527 error ("%q#D redeclared as different kind of symbol", newdecl);
1528 if (TREE_CODE (olddecl) == TREE_LIST)
1529 olddecl = TREE_VALUE (olddecl);
1530 inform (DECL_SOURCE_LOCATION (olddecl),
1531 "previous declaration %q#D", olddecl);
1533 return error_mark_node;
1535 else if (!types_match)
1537 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
1538 /* These are certainly not duplicate declarations; they're
1539 from different scopes. */
1540 return NULL_TREE;
1542 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1544 /* The name of a class template may not be declared to refer to
1545 any other template, class, function, object, namespace, value,
1546 or type in the same scope. */
1547 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == TYPE_DECL
1548 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1550 error ("conflicting declaration of template %q#D", newdecl);
1551 inform (DECL_SOURCE_LOCATION (olddecl),
1552 "previous declaration %q#D", olddecl);
1553 return error_mark_node;
1555 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == FUNCTION_DECL
1556 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == FUNCTION_DECL
1557 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl))),
1558 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl))))
1559 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1560 DECL_TEMPLATE_PARMS (olddecl))
1561 /* Template functions can be disambiguated by
1562 return type. */
1563 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl)),
1564 TREE_TYPE (TREE_TYPE (olddecl))))
1566 error ("ambiguating new declaration %q#D", newdecl);
1567 inform (DECL_SOURCE_LOCATION (olddecl),
1568 "old declaration %q#D", olddecl);
1570 return NULL_TREE;
1572 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1574 if (DECL_EXTERN_C_P (newdecl) && DECL_EXTERN_C_P (olddecl))
1576 error ("conflicting declaration of C function %q#D",
1577 newdecl);
1578 inform (DECL_SOURCE_LOCATION (olddecl),
1579 "previous declaration %q#D", olddecl);
1580 return NULL_TREE;
1582 /* For function versions, params and types match, but they
1583 are not ambiguous. */
1584 else if ((!DECL_FUNCTION_VERSIONED (newdecl)
1585 && !DECL_FUNCTION_VERSIONED (olddecl))
1586 && compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1587 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1589 error ("ambiguating new declaration of %q#D", newdecl);
1590 inform (DECL_SOURCE_LOCATION (olddecl),
1591 "old declaration %q#D", olddecl);
1592 return error_mark_node;
1594 else
1595 return NULL_TREE;
1597 else
1599 error ("conflicting declaration %q#D", newdecl);
1600 inform (DECL_SOURCE_LOCATION (olddecl),
1601 "previous declaration as %q#D", olddecl);
1602 return error_mark_node;
1605 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1606 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1607 && (!DECL_TEMPLATE_INFO (newdecl)
1608 || (DECL_TI_TEMPLATE (newdecl)
1609 != DECL_TI_TEMPLATE (olddecl))))
1610 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1611 && (!DECL_TEMPLATE_INFO (olddecl)
1612 || (DECL_TI_TEMPLATE (olddecl)
1613 != DECL_TI_TEMPLATE (newdecl))))))
1614 /* It's OK to have a template specialization and a non-template
1615 with the same type, or to have specializations of two
1616 different templates with the same type. Note that if one is a
1617 specialization, and the other is an instantiation of the same
1618 template, that we do not exit at this point. That situation
1619 can occur if we instantiate a template class, and then
1620 specialize one of its methods. This situation is valid, but
1621 the declarations must be merged in the usual way. */
1622 return NULL_TREE;
1623 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1624 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1625 && !DECL_USE_TEMPLATE (newdecl))
1626 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1627 && !DECL_USE_TEMPLATE (olddecl))))
1628 /* One of the declarations is a template instantiation, and the
1629 other is not a template at all. That's OK. */
1630 return NULL_TREE;
1631 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1633 /* In [namespace.alias] we have:
1635 In a declarative region, a namespace-alias-definition can be
1636 used to redefine a namespace-alias declared in that declarative
1637 region to refer only to the namespace to which it already
1638 refers.
1640 Therefore, if we encounter a second alias directive for the same
1641 alias, we can just ignore the second directive. */
1642 if (DECL_NAMESPACE_ALIAS (newdecl)
1643 && (DECL_NAMESPACE_ALIAS (newdecl)
1644 == DECL_NAMESPACE_ALIAS (olddecl)))
1645 return olddecl;
1646 /* [namespace.alias]
1648 A namespace-name or namespace-alias shall not be declared as
1649 the name of any other entity in the same declarative region.
1650 A namespace-name defined at global scope shall not be
1651 declared as the name of any other entity in any global scope
1652 of the program. */
1653 error ("conflicting declaration of namespace %qD", newdecl);
1654 inform (DECL_SOURCE_LOCATION (olddecl),
1655 "previous declaration of namespace %qD here", olddecl);
1656 return error_mark_node;
1658 else
1660 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1661 if (errmsg)
1663 error_at (DECL_SOURCE_LOCATION (newdecl), errmsg, newdecl);
1664 if (DECL_NAME (olddecl) != NULL_TREE)
1665 inform (input_location,
1666 (DECL_INITIAL (olddecl) && namespace_bindings_p ())
1667 ? G_("%q+#D previously defined here")
1668 : G_("%q+#D previously declared here"), olddecl);
1669 return error_mark_node;
1671 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1672 && DECL_INITIAL (olddecl) != NULL_TREE
1673 && !prototype_p (TREE_TYPE (olddecl))
1674 && prototype_p (TREE_TYPE (newdecl)))
1676 /* Prototype decl follows defn w/o prototype. */
1677 if (warning_at (DECL_SOURCE_LOCATION (newdecl), 0,
1678 "prototype specified for %q#D", newdecl))
1679 inform (DECL_SOURCE_LOCATION (olddecl),
1680 "previous non-prototype definition here");
1682 else if (VAR_OR_FUNCTION_DECL_P (olddecl)
1683 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1685 /* [dcl.link]
1686 If two declarations of the same function or object
1687 specify different linkage-specifications ..., the program
1688 is ill-formed.... Except for functions with C++ linkage,
1689 a function declaration without a linkage specification
1690 shall not precede the first linkage specification for
1691 that function. A function can be declared without a
1692 linkage specification after an explicit linkage
1693 specification has been seen; the linkage explicitly
1694 specified in the earlier declaration is not affected by
1695 such a function declaration.
1697 DR 563 raises the question why the restrictions on
1698 functions should not also apply to objects. Older
1699 versions of G++ silently ignore the linkage-specification
1700 for this example:
1702 namespace N {
1703 extern int i;
1704 extern "C" int i;
1707 which is clearly wrong. Therefore, we now treat objects
1708 like functions. */
1709 if (current_lang_depth () == 0)
1711 /* There is no explicit linkage-specification, so we use
1712 the linkage from the previous declaration. */
1713 if (!DECL_LANG_SPECIFIC (newdecl))
1714 retrofit_lang_decl (newdecl);
1715 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1717 else
1719 error ("conflicting declaration of %q#D with %qL linkage",
1720 newdecl, DECL_LANGUAGE (newdecl));
1721 inform (DECL_SOURCE_LOCATION (olddecl),
1722 "previous declaration with %qL linkage",
1723 DECL_LANGUAGE (olddecl));
1727 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1729 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1731 /* Note: free functions, as TEMPLATE_DECLs, are handled below. */
1732 if (DECL_FUNCTION_MEMBER_P (olddecl)
1733 && (/* grokfndecl passes member function templates too
1734 as FUNCTION_DECLs. */
1735 DECL_TEMPLATE_INFO (olddecl)
1736 /* C++11 8.3.6/6.
1737 Default arguments for a member function of a class
1738 template shall be specified on the initial declaration
1739 of the member function within the class template. */
1740 || CLASSTYPE_TEMPLATE_INFO (CP_DECL_CONTEXT (olddecl))))
1741 check_redeclaration_no_default_args (newdecl);
1742 else
1744 tree t1 = FUNCTION_FIRST_USER_PARMTYPE (olddecl);
1745 tree t2 = FUNCTION_FIRST_USER_PARMTYPE (newdecl);
1746 int i = 1;
1748 for (; t1 && t1 != void_list_node;
1749 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1750 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1752 if (1 == simple_cst_equal (TREE_PURPOSE (t1),
1753 TREE_PURPOSE (t2)))
1755 if (permerror (input_location,
1756 "default argument given for parameter "
1757 "%d of %q#D", i, newdecl))
1758 inform (DECL_SOURCE_LOCATION (olddecl),
1759 "previous specification in %q#D here",
1760 olddecl);
1762 else
1764 error ("default argument given for parameter %d "
1765 "of %q#D", i, newdecl);
1766 inform (DECL_SOURCE_LOCATION (olddecl),
1767 "previous specification in %q#D here",
1768 olddecl);
1775 /* Do not merge an implicit typedef with an explicit one. In:
1777 class A;
1779 typedef class A A __attribute__ ((foo));
1781 the attribute should apply only to the typedef. */
1782 if (TREE_CODE (olddecl) == TYPE_DECL
1783 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1784 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1785 return NULL_TREE;
1787 /* If new decl is `static' and an `extern' was seen previously,
1788 warn about it. */
1789 warn_extern_redeclared_static (newdecl, olddecl);
1791 if (!validate_constexpr_redeclaration (olddecl, newdecl))
1792 return error_mark_node;
1794 /* We have committed to returning 1 at this point. */
1795 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1797 /* Now that functions must hold information normally held
1798 by field decls, there is extra work to do so that
1799 declaration information does not get destroyed during
1800 definition. */
1801 if (DECL_VINDEX (olddecl))
1802 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1803 if (DECL_CONTEXT (olddecl))
1804 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1805 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1806 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1807 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1808 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1809 DECL_INVALID_OVERRIDER_P (newdecl) |= DECL_INVALID_OVERRIDER_P (olddecl);
1810 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1811 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1812 SET_OVERLOADED_OPERATOR_CODE
1813 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1814 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1816 /* Optionally warn about more than one declaration for the same
1817 name, but don't warn about a function declaration followed by a
1818 definition. */
1819 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1820 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1821 /* Don't warn about extern decl followed by definition. */
1822 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1823 /* Don't warn about friends, let add_friend take care of it. */
1824 && ! (newdecl_is_friend || DECL_FRIEND_P (olddecl))
1825 /* Don't warn about declaration followed by specialization. */
1826 && (! DECL_TEMPLATE_SPECIALIZATION (newdecl)
1827 || DECL_TEMPLATE_SPECIALIZATION (olddecl)))
1829 if (warning (OPT_Wredundant_decls,
1830 "redundant redeclaration of %qD in same scope",
1831 newdecl))
1832 inform (DECL_SOURCE_LOCATION (olddecl),
1833 "previous declaration of %qD", olddecl);
1836 if (!(DECL_TEMPLATE_INSTANTIATION (olddecl)
1837 && DECL_TEMPLATE_SPECIALIZATION (newdecl)))
1839 if (DECL_DELETED_FN (newdecl))
1841 error ("deleted definition of %qD", newdecl);
1842 inform (DECL_SOURCE_LOCATION (olddecl),
1843 "previous declaration of %qD", olddecl);
1845 DECL_DELETED_FN (newdecl) |= DECL_DELETED_FN (olddecl);
1849 /* Deal with C++: must preserve virtual function table size. */
1850 if (TREE_CODE (olddecl) == TYPE_DECL)
1852 tree newtype = TREE_TYPE (newdecl);
1853 tree oldtype = TREE_TYPE (olddecl);
1855 if (newtype != error_mark_node && oldtype != error_mark_node
1856 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1857 CLASSTYPE_FRIEND_CLASSES (newtype)
1858 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1860 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1863 /* Copy all the DECL_... slots specified in the new decl
1864 except for any that we copy here from the old type. */
1865 DECL_ATTRIBUTES (newdecl)
1866 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1868 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1870 tree old_result;
1871 tree new_result;
1872 old_result = DECL_TEMPLATE_RESULT (olddecl);
1873 new_result = DECL_TEMPLATE_RESULT (newdecl);
1874 TREE_TYPE (olddecl) = TREE_TYPE (old_result);
1875 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1876 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1877 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1879 DECL_ATTRIBUTES (old_result)
1880 = (*targetm.merge_decl_attributes) (old_result, new_result);
1882 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1884 /* Per C++11 8.3.6/4, default arguments cannot be added in later
1885 declarations of a function template. */
1886 check_redeclaration_no_default_args (newdecl);
1888 check_default_args (newdecl);
1890 if (GNU_INLINE_P (old_result) != GNU_INLINE_P (new_result)
1891 && DECL_INITIAL (new_result))
1893 if (DECL_INITIAL (old_result))
1894 DECL_UNINLINABLE (old_result) = 1;
1895 else
1896 DECL_UNINLINABLE (old_result) = DECL_UNINLINABLE (new_result);
1897 DECL_EXTERNAL (old_result) = DECL_EXTERNAL (new_result);
1898 DECL_NOT_REALLY_EXTERN (old_result)
1899 = DECL_NOT_REALLY_EXTERN (new_result);
1900 DECL_INTERFACE_KNOWN (old_result)
1901 = DECL_INTERFACE_KNOWN (new_result);
1902 DECL_DECLARED_INLINE_P (old_result)
1903 = DECL_DECLARED_INLINE_P (new_result);
1904 DECL_DISREGARD_INLINE_LIMITS (old_result)
1905 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1908 else
1910 DECL_DECLARED_INLINE_P (old_result)
1911 |= DECL_DECLARED_INLINE_P (new_result);
1912 DECL_DISREGARD_INLINE_LIMITS (old_result)
1913 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1914 check_redeclaration_exception_specification (newdecl, olddecl);
1918 /* If the new declaration is a definition, update the file and
1919 line information on the declaration, and also make
1920 the old declaration the same definition. */
1921 if (DECL_INITIAL (new_result) != NULL_TREE)
1923 DECL_SOURCE_LOCATION (olddecl)
1924 = DECL_SOURCE_LOCATION (old_result)
1925 = DECL_SOURCE_LOCATION (newdecl);
1926 DECL_INITIAL (old_result) = DECL_INITIAL (new_result);
1927 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1929 tree parm;
1930 DECL_ARGUMENTS (old_result)
1931 = DECL_ARGUMENTS (new_result);
1932 for (parm = DECL_ARGUMENTS (old_result); parm;
1933 parm = DECL_CHAIN (parm))
1934 DECL_CONTEXT (parm) = old_result;
1938 return olddecl;
1941 if (types_match)
1943 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1944 check_redeclaration_exception_specification (newdecl, olddecl);
1946 /* Automatically handles default parameters. */
1947 tree oldtype = TREE_TYPE (olddecl);
1948 tree newtype;
1950 /* For typedefs use the old type, as the new type's DECL_NAME points
1951 at newdecl, which will be ggc_freed. */
1952 if (TREE_CODE (newdecl) == TYPE_DECL)
1953 newtype = oldtype;
1954 else
1955 /* Merge the data types specified in the two decls. */
1956 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1958 if (VAR_P (newdecl))
1960 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
1961 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
1962 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl)
1963 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl);
1964 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
1965 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
1967 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
1968 if (DECL_LANG_SPECIFIC (olddecl)
1969 && CP_DECL_THREADPRIVATE_P (olddecl))
1971 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
1972 if (!DECL_LANG_SPECIFIC (newdecl))
1973 retrofit_lang_decl (newdecl);
1975 CP_DECL_THREADPRIVATE_P (newdecl) = 1;
1979 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
1981 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1982 check_default_args (newdecl);
1984 /* Lay the type out, unless already done. */
1985 if (! same_type_p (newtype, oldtype)
1986 && TREE_TYPE (newdecl) != error_mark_node
1987 && !(processing_template_decl && uses_template_parms (newdecl)))
1988 layout_type (TREE_TYPE (newdecl));
1990 if ((VAR_P (newdecl)
1991 || TREE_CODE (newdecl) == PARM_DECL
1992 || TREE_CODE (newdecl) == RESULT_DECL
1993 || TREE_CODE (newdecl) == FIELD_DECL
1994 || TREE_CODE (newdecl) == TYPE_DECL)
1995 && !(processing_template_decl && uses_template_parms (newdecl)))
1996 layout_decl (newdecl, 0);
1998 /* Merge the type qualifiers. */
1999 if (TREE_READONLY (newdecl))
2000 TREE_READONLY (olddecl) = 1;
2001 if (TREE_THIS_VOLATILE (newdecl))
2002 TREE_THIS_VOLATILE (olddecl) = 1;
2003 if (TREE_NOTHROW (newdecl))
2004 TREE_NOTHROW (olddecl) = 1;
2006 /* Merge deprecatedness. */
2007 if (TREE_DEPRECATED (newdecl))
2008 TREE_DEPRECATED (olddecl) = 1;
2010 /* Preserve function specific target and optimization options */
2011 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2013 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
2014 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
2015 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
2016 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
2018 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
2019 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
2020 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
2021 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
2024 /* Merge the initialization information. */
2025 if (DECL_INITIAL (newdecl) == NULL_TREE
2026 && DECL_INITIAL (olddecl) != NULL_TREE)
2028 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2029 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
2030 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2032 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
2033 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
2037 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2039 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
2040 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
2041 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
2042 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
2043 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
2044 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
2045 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
2046 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
2047 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
2048 DECL_LOOPING_CONST_OR_PURE_P (newdecl)
2049 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl);
2050 /* Keep the old RTL. */
2051 COPY_DECL_RTL (olddecl, newdecl);
2053 else if (VAR_P (newdecl)
2054 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
2056 /* Keep the old RTL. We cannot keep the old RTL if the old
2057 declaration was for an incomplete object and the new
2058 declaration is not since many attributes of the RTL will
2059 change. */
2060 COPY_DECL_RTL (olddecl, newdecl);
2063 /* If cannot merge, then use the new type and qualifiers,
2064 and don't preserve the old rtl. */
2065 else
2067 /* Clean out any memory we had of the old declaration. */
2068 tree oldstatic = value_member (olddecl, static_aggregates);
2069 if (oldstatic)
2070 TREE_VALUE (oldstatic) = error_mark_node;
2072 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
2073 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
2074 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
2075 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
2078 /* Merge the storage class information. */
2079 merge_weak (newdecl, olddecl);
2081 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
2082 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
2083 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
2084 if (! DECL_EXTERNAL (olddecl))
2085 DECL_EXTERNAL (newdecl) = 0;
2087 new_template_info = NULL_TREE;
2088 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
2090 bool new_redefines_gnu_inline = false;
2092 if (new_defines_function
2093 && ((DECL_INTERFACE_KNOWN (olddecl)
2094 && TREE_CODE (olddecl) == FUNCTION_DECL)
2095 || (TREE_CODE (olddecl) == TEMPLATE_DECL
2096 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
2097 == FUNCTION_DECL))))
2099 tree fn = olddecl;
2101 if (TREE_CODE (fn) == TEMPLATE_DECL)
2102 fn = DECL_TEMPLATE_RESULT (olddecl);
2104 new_redefines_gnu_inline = GNU_INLINE_P (fn) && DECL_INITIAL (fn);
2107 if (!new_redefines_gnu_inline)
2109 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
2110 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
2111 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
2113 DECL_TEMPLATE_INSTANTIATED (newdecl)
2114 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
2115 DECL_ODR_USED (newdecl) |= DECL_ODR_USED (olddecl);
2117 /* If the OLDDECL is an instantiation and/or specialization,
2118 then the NEWDECL must be too. But, it may not yet be marked
2119 as such if the caller has created NEWDECL, but has not yet
2120 figured out that it is a redeclaration. */
2121 if (!DECL_USE_TEMPLATE (newdecl))
2122 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
2124 /* Don't really know how much of the language-specific
2125 values we should copy from old to new. */
2126 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
2127 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
2128 DECL_INITIALIZED_IN_CLASS_P (newdecl)
2129 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
2131 if (LANG_DECL_HAS_MIN (newdecl))
2133 DECL_LANG_SPECIFIC (newdecl)->u.min.u2 =
2134 DECL_LANG_SPECIFIC (olddecl)->u.min.u2;
2135 if (DECL_TEMPLATE_INFO (newdecl))
2137 new_template_info = DECL_TEMPLATE_INFO (newdecl);
2138 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
2139 && DECL_TEMPLATE_SPECIALIZATION (newdecl))
2140 /* Remember the presence of explicit specialization args. */
2141 TINFO_USED_TEMPLATE_ID (DECL_TEMPLATE_INFO (olddecl))
2142 = TINFO_USED_TEMPLATE_ID (new_template_info);
2144 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
2146 /* Only functions have these fields. */
2147 if (DECL_DECLARES_FUNCTION_P (newdecl))
2149 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
2150 olddecl_friend = DECL_FRIEND_P (olddecl);
2151 hidden_friend = (DECL_ANTICIPATED (olddecl)
2152 && DECL_HIDDEN_FRIEND_P (olddecl)
2153 && newdecl_is_friend);
2154 DECL_BEFRIENDING_CLASSES (newdecl)
2155 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
2156 DECL_BEFRIENDING_CLASSES (olddecl));
2157 /* DECL_THUNKS is only valid for virtual functions,
2158 otherwise it is a DECL_FRIEND_CONTEXT. */
2159 if (DECL_VIRTUAL_P (newdecl))
2160 SET_DECL_THUNKS (newdecl, DECL_THUNKS (olddecl));
2162 /* Only variables have this field. */
2163 else if (VAR_P (newdecl)
2164 && VAR_HAD_UNKNOWN_BOUND (olddecl))
2165 SET_VAR_HAD_UNKNOWN_BOUND (newdecl);
2168 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2170 tree parm;
2172 /* Merge parameter attributes. */
2173 tree oldarg, newarg;
2174 for (oldarg = DECL_ARGUMENTS(olddecl),
2175 newarg = DECL_ARGUMENTS(newdecl);
2176 oldarg && newarg;
2177 oldarg = DECL_CHAIN(oldarg), newarg = DECL_CHAIN(newarg)) {
2178 DECL_ATTRIBUTES (newarg)
2179 = (*targetm.merge_decl_attributes) (oldarg, newarg);
2180 DECL_ATTRIBUTES (oldarg) = DECL_ATTRIBUTES (newarg);
2183 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
2184 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
2186 /* If newdecl is not a specialization, then it is not a
2187 template-related function at all. And that means that we
2188 should have exited above, returning 0. */
2189 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
2191 if (DECL_ODR_USED (olddecl))
2192 /* From [temp.expl.spec]:
2194 If a template, a member template or the member of a class
2195 template is explicitly specialized then that
2196 specialization shall be declared before the first use of
2197 that specialization that would cause an implicit
2198 instantiation to take place, in every translation unit in
2199 which such a use occurs. */
2200 error ("explicit specialization of %qD after first use",
2201 olddecl);
2203 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
2204 DECL_COMDAT (newdecl) = (TREE_PUBLIC (newdecl)
2205 && DECL_DECLARED_INLINE_P (newdecl));
2207 /* Don't propagate visibility from the template to the
2208 specialization here. We'll do that in determine_visibility if
2209 appropriate. */
2210 DECL_VISIBILITY_SPECIFIED (olddecl) = 0;
2212 /* [temp.expl.spec/14] We don't inline explicit specialization
2213 just because the primary template says so. */
2215 /* But still keep DECL_DISREGARD_INLINE_LIMITS in sync with
2216 the always_inline attribute. */
2217 if (DECL_DISREGARD_INLINE_LIMITS (olddecl)
2218 && !DECL_DISREGARD_INLINE_LIMITS (newdecl))
2220 if (DECL_DECLARED_INLINE_P (newdecl))
2221 DECL_DISREGARD_INLINE_LIMITS (newdecl) = true;
2222 else
2223 DECL_ATTRIBUTES (newdecl)
2224 = remove_attribute ("always_inline",
2225 DECL_ATTRIBUTES (newdecl));
2228 else if (new_defines_function && DECL_INITIAL (olddecl))
2230 /* Never inline re-defined extern inline functions.
2231 FIXME: this could be better handled by keeping both
2232 function as separate declarations. */
2233 DECL_UNINLINABLE (newdecl) = 1;
2235 else
2237 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
2238 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
2240 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
2242 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
2243 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
2245 DECL_DISREGARD_INLINE_LIMITS (newdecl)
2246 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
2247 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
2248 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
2251 /* Preserve abstractness on cloned [cd]tors. */
2252 DECL_ABSTRACT_P (newdecl) = DECL_ABSTRACT_P (olddecl);
2254 /* Update newdecl's parms to point at olddecl. */
2255 for (parm = DECL_ARGUMENTS (newdecl); parm;
2256 parm = DECL_CHAIN (parm))
2257 DECL_CONTEXT (parm) = olddecl;
2259 if (! types_match)
2261 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
2262 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
2263 COPY_DECL_RTL (newdecl, olddecl);
2265 if (! types_match || new_defines_function)
2267 /* These need to be copied so that the names are available.
2268 Note that if the types do match, we'll preserve inline
2269 info and other bits, but if not, we won't. */
2270 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
2271 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
2273 /* If redeclaring a builtin function, it stays built in
2274 if newdecl is a gnu_inline definition, or if newdecl is just
2275 a declaration. */
2276 if (DECL_BUILT_IN (olddecl)
2277 && (new_defines_function ? GNU_INLINE_P (newdecl) : types_match))
2279 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2280 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2281 /* If we're keeping the built-in definition, keep the rtl,
2282 regardless of declaration matches. */
2283 COPY_DECL_RTL (olddecl, newdecl);
2284 if (DECL_BUILT_IN_CLASS (newdecl) == BUILT_IN_NORMAL)
2286 enum built_in_function fncode = DECL_FUNCTION_CODE (newdecl);
2287 switch (fncode)
2289 /* If a compatible prototype of these builtin functions
2290 is seen, assume the runtime implements it with the
2291 expected semantics. */
2292 case BUILT_IN_STPCPY:
2293 if (builtin_decl_explicit_p (fncode))
2294 set_builtin_decl_implicit_p (fncode, true);
2295 break;
2296 default:
2297 break;
2301 if (new_defines_function)
2302 /* If defining a function declared with other language
2303 linkage, use the previously declared language linkage. */
2304 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
2305 else if (types_match)
2307 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2308 /* Don't clear out the arguments if we're just redeclaring a
2309 function. */
2310 if (DECL_ARGUMENTS (olddecl))
2311 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2314 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
2315 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
2317 /* Now preserve various other info from the definition. */
2318 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
2319 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
2320 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2321 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2323 /* Warn about conflicting visibility specifications. */
2324 if (DECL_VISIBILITY_SPECIFIED (olddecl)
2325 && DECL_VISIBILITY_SPECIFIED (newdecl)
2326 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2328 if (warning_at (DECL_SOURCE_LOCATION (newdecl), OPT_Wattributes,
2329 "%qD: visibility attribute ignored because it "
2330 "conflicts with previous declaration", newdecl))
2331 inform (DECL_SOURCE_LOCATION (olddecl),
2332 "previous declaration of %qD", olddecl);
2334 /* Choose the declaration which specified visibility. */
2335 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2337 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2338 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2340 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2341 so keep this behavior. */
2342 if (VAR_P (newdecl) && DECL_HAS_INIT_PRIORITY_P (newdecl))
2344 SET_DECL_INIT_PRIORITY (olddecl, DECL_INIT_PRIORITY (newdecl));
2345 DECL_HAS_INIT_PRIORITY_P (olddecl) = 1;
2347 /* Likewise for DECL_ALIGN, DECL_USER_ALIGN and DECL_PACKED. */
2348 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
2350 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
2351 DECL_USER_ALIGN (newdecl) |= DECL_USER_ALIGN (olddecl);
2353 DECL_USER_ALIGN (olddecl) = DECL_USER_ALIGN (newdecl);
2354 if (TREE_CODE (newdecl) == FIELD_DECL)
2355 DECL_PACKED (olddecl) = DECL_PACKED (newdecl);
2357 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2358 with that from NEWDECL below. */
2359 if (DECL_LANG_SPECIFIC (olddecl))
2361 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
2362 != DECL_LANG_SPECIFIC (newdecl));
2363 ggc_free (DECL_LANG_SPECIFIC (olddecl));
2366 /* Merge the USED information. */
2367 if (TREE_USED (olddecl))
2368 TREE_USED (newdecl) = 1;
2369 else if (TREE_USED (newdecl))
2370 TREE_USED (olddecl) = 1;
2371 if (VAR_P (newdecl))
2373 if (DECL_READ_P (olddecl))
2374 DECL_READ_P (newdecl) = 1;
2375 else if (DECL_READ_P (newdecl))
2376 DECL_READ_P (olddecl) = 1;
2378 if (DECL_PRESERVE_P (olddecl))
2379 DECL_PRESERVE_P (newdecl) = 1;
2380 else if (DECL_PRESERVE_P (newdecl))
2381 DECL_PRESERVE_P (olddecl) = 1;
2383 /* Merge the DECL_FUNCTION_VERSIONED information. newdecl will be copied
2384 to olddecl and deleted. */
2385 if (TREE_CODE (newdecl) == FUNCTION_DECL
2386 && DECL_FUNCTION_VERSIONED (olddecl))
2388 /* Set the flag for newdecl so that it gets copied to olddecl. */
2389 DECL_FUNCTION_VERSIONED (newdecl) = 1;
2390 /* newdecl will be purged after copying to olddecl and is no longer
2391 a version. */
2392 cgraph_node::delete_function_version (newdecl);
2395 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2397 int function_size;
2398 struct symtab_node *snode = symtab_node::get (olddecl);
2400 function_size = sizeof (struct tree_decl_common);
2402 memcpy ((char *) olddecl + sizeof (struct tree_common),
2403 (char *) newdecl + sizeof (struct tree_common),
2404 function_size - sizeof (struct tree_common));
2406 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2407 (char *) newdecl + sizeof (struct tree_decl_common),
2408 sizeof (struct tree_function_decl) - sizeof (struct tree_decl_common));
2410 /* Preserve symtab node mapping. */
2411 olddecl->decl_with_vis.symtab_node = snode;
2413 if (new_template_info)
2414 /* If newdecl is a template instantiation, it is possible that
2415 the following sequence of events has occurred:
2417 o A friend function was declared in a class template. The
2418 class template was instantiated.
2420 o The instantiation of the friend declaration was
2421 recorded on the instantiation list, and is newdecl.
2423 o Later, however, instantiate_class_template called pushdecl
2424 on the newdecl to perform name injection. But, pushdecl in
2425 turn called duplicate_decls when it discovered that another
2426 declaration of a global function with the same name already
2427 existed.
2429 o Here, in duplicate_decls, we decided to clobber newdecl.
2431 If we're going to do that, we'd better make sure that
2432 olddecl, and not newdecl, is on the list of
2433 instantiations so that if we try to do the instantiation
2434 again we won't get the clobbered declaration. */
2435 reregister_specialization (newdecl,
2436 new_template_info,
2437 olddecl);
2439 else
2441 size_t size = tree_code_size (TREE_CODE (newdecl));
2443 memcpy ((char *) olddecl + sizeof (struct tree_common),
2444 (char *) newdecl + sizeof (struct tree_common),
2445 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2446 switch (TREE_CODE (newdecl))
2448 case LABEL_DECL:
2449 case VAR_DECL:
2450 case RESULT_DECL:
2451 case PARM_DECL:
2452 case FIELD_DECL:
2453 case TYPE_DECL:
2454 case CONST_DECL:
2456 struct symtab_node *snode = NULL;
2458 if (TREE_CODE (newdecl) == VAR_DECL
2459 && (TREE_STATIC (olddecl) || TREE_PUBLIC (olddecl) || DECL_EXTERNAL (olddecl)))
2460 snode = symtab_node::get (olddecl);
2461 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2462 (char *) newdecl + sizeof (struct tree_decl_common),
2463 size - sizeof (struct tree_decl_common)
2464 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2465 if (TREE_CODE (newdecl) == VAR_DECL)
2466 olddecl->decl_with_vis.symtab_node = snode;
2468 break;
2469 default:
2470 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2471 (char *) newdecl + sizeof (struct tree_decl_common),
2472 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)
2473 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2474 break;
2478 if (TREE_CODE (newdecl) == FUNCTION_DECL
2479 || TREE_CODE (newdecl) == VAR_DECL)
2481 if (DECL_EXTERNAL (olddecl)
2482 || TREE_PUBLIC (olddecl)
2483 || TREE_STATIC (olddecl))
2485 /* Merge the section attribute.
2486 We want to issue an error if the sections conflict but that must be
2487 done later in decl_attributes since we are called before attributes
2488 are assigned. */
2489 if (DECL_SECTION_NAME (newdecl) != NULL)
2490 set_decl_section_name (olddecl, DECL_SECTION_NAME (newdecl));
2492 if (DECL_ONE_ONLY (newdecl))
2494 struct symtab_node *oldsym, *newsym;
2495 if (TREE_CODE (olddecl) == FUNCTION_DECL)
2496 oldsym = cgraph_node::get_create (olddecl);
2497 else
2498 oldsym = varpool_node::get_create (olddecl);
2499 newsym = symtab_node::get (newdecl);
2500 oldsym->set_comdat_group (newsym->get_comdat_group ());
2504 if (TREE_CODE (newdecl) == VAR_DECL
2505 && DECL_THREAD_LOCAL_P (newdecl))
2506 set_decl_tls_model (olddecl, DECL_TLS_MODEL (newdecl));
2509 DECL_UID (olddecl) = olddecl_uid;
2510 if (olddecl_friend)
2511 DECL_FRIEND_P (olddecl) = 1;
2512 if (hidden_friend)
2514 DECL_ANTICIPATED (olddecl) = 1;
2515 DECL_HIDDEN_FRIEND_P (olddecl) = 1;
2518 /* NEWDECL contains the merged attribute lists.
2519 Update OLDDECL to be the same. */
2520 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2522 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2523 so that encode_section_info has a chance to look at the new decl
2524 flags and attributes. */
2525 if (DECL_RTL_SET_P (olddecl)
2526 && (TREE_CODE (olddecl) == FUNCTION_DECL
2527 || (VAR_P (olddecl)
2528 && TREE_STATIC (olddecl))))
2529 make_decl_rtl (olddecl);
2531 /* The NEWDECL will no longer be needed. Because every out-of-class
2532 declaration of a member results in a call to duplicate_decls,
2533 freeing these nodes represents in a significant savings.
2535 Before releasing the node, be sore to remove function from symbol
2536 table that might have been inserted there to record comdat group.
2537 Be sure to however do not free DECL_STRUCT_FUNCTION becuase this
2538 structure is shared in between newdecl and oldecl. */
2539 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2540 DECL_STRUCT_FUNCTION (newdecl) = NULL;
2541 if (TREE_CODE (newdecl) == FUNCTION_DECL
2542 || TREE_CODE (newdecl) == VAR_DECL)
2544 struct symtab_node *snode = symtab_node::get (newdecl);
2545 if (snode)
2546 snode->remove ();
2548 ggc_free (newdecl);
2550 return olddecl;
2553 /* Return zero if the declaration NEWDECL is valid
2554 when the declaration OLDDECL (assumed to be for the same name)
2555 has already been seen.
2556 Otherwise return an error message format string with a %s
2557 where the identifier should go. */
2559 static const char *
2560 redeclaration_error_message (tree newdecl, tree olddecl)
2562 if (TREE_CODE (newdecl) == TYPE_DECL)
2564 /* Because C++ can put things into name space for free,
2565 constructs like "typedef struct foo { ... } foo"
2566 would look like an erroneous redeclaration. */
2567 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
2568 return NULL;
2569 else
2570 return G_("redefinition of %q#D");
2572 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2574 /* If this is a pure function, its olddecl will actually be
2575 the original initialization to `0' (which we force to call
2576 abort()). Don't complain about redefinition in this case. */
2577 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
2578 && DECL_INITIAL (olddecl) == NULL_TREE)
2579 return NULL;
2581 /* If both functions come from different namespaces, this is not
2582 a redeclaration - this is a conflict with a used function. */
2583 if (DECL_NAMESPACE_SCOPE_P (olddecl)
2584 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
2585 && ! decls_match (olddecl, newdecl))
2586 return G_("%qD conflicts with used function");
2588 /* We'll complain about linkage mismatches in
2589 warn_extern_redeclared_static. */
2591 /* Defining the same name twice is no good. */
2592 if (DECL_INITIAL (olddecl) != NULL_TREE
2593 && DECL_INITIAL (newdecl) != NULL_TREE)
2595 if (DECL_NAME (olddecl) == NULL_TREE)
2596 return G_("%q#D not declared in class");
2597 else if (!GNU_INLINE_P (olddecl)
2598 || GNU_INLINE_P (newdecl))
2599 return G_("redefinition of %q#D");
2602 if (DECL_DECLARED_INLINE_P (olddecl) && DECL_DECLARED_INLINE_P (newdecl))
2604 bool olda = GNU_INLINE_P (olddecl);
2605 bool newa = GNU_INLINE_P (newdecl);
2607 if (olda != newa)
2609 if (newa)
2610 return G_("%q+D redeclared inline with "
2611 "%<gnu_inline%> attribute");
2612 else
2613 return G_("%q+D redeclared inline without "
2614 "%<gnu_inline%> attribute");
2618 check_abi_tag_redeclaration
2619 (olddecl, lookup_attribute ("abi_tag", DECL_ATTRIBUTES (olddecl)),
2620 lookup_attribute ("abi_tag", DECL_ATTRIBUTES (newdecl)));
2622 return NULL;
2624 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
2626 tree nt, ot;
2628 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
2630 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
2631 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
2632 return G_("redefinition of %q#D");
2633 return NULL;
2636 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
2637 || (DECL_TEMPLATE_RESULT (newdecl)
2638 == DECL_TEMPLATE_RESULT (olddecl)))
2639 return NULL;
2641 nt = DECL_TEMPLATE_RESULT (newdecl);
2642 if (DECL_TEMPLATE_INFO (nt))
2643 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
2644 ot = DECL_TEMPLATE_RESULT (olddecl);
2645 if (DECL_TEMPLATE_INFO (ot))
2646 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
2647 if (DECL_INITIAL (nt) && DECL_INITIAL (ot)
2648 && (!GNU_INLINE_P (ot) || GNU_INLINE_P (nt)))
2649 return G_("redefinition of %q#D");
2651 if (DECL_DECLARED_INLINE_P (ot) && DECL_DECLARED_INLINE_P (nt))
2653 bool olda = GNU_INLINE_P (ot);
2654 bool newa = GNU_INLINE_P (nt);
2656 if (olda != newa)
2658 if (newa)
2659 return G_("%q+D redeclared inline with "
2660 "%<gnu_inline%> attribute");
2661 else
2662 return G_("%q+D redeclared inline without "
2663 "%<gnu_inline%> attribute");
2667 /* Core issue #226 (C++0x):
2669 If a friend function template declaration specifies a
2670 default template-argument, that declaration shall be a
2671 definition and shall be the only declaration of the
2672 function template in the translation unit. */
2673 if ((cxx_dialect != cxx98)
2674 && TREE_CODE (ot) == FUNCTION_DECL && DECL_FRIEND_P (ot)
2675 && !check_default_tmpl_args (nt, DECL_TEMPLATE_PARMS (newdecl),
2676 /*is_primary=*/true,
2677 /*is_partial=*/false,
2678 /*is_friend_decl=*/2))
2679 return G_("redeclaration of friend %q#D "
2680 "may not have default template arguments");
2682 return NULL;
2684 else if (VAR_P (newdecl)
2685 && DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl)
2686 && (! DECL_LANG_SPECIFIC (olddecl)
2687 || ! CP_DECL_THREADPRIVATE_P (olddecl)
2688 || DECL_THREAD_LOCAL_P (newdecl)))
2690 /* Only variables can be thread-local, and all declarations must
2691 agree on this property. */
2692 if (DECL_THREAD_LOCAL_P (newdecl))
2693 return G_("thread-local declaration of %q#D follows "
2694 "non-thread-local declaration");
2695 else
2696 return G_("non-thread-local declaration of %q#D follows "
2697 "thread-local declaration");
2699 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2701 /* The objects have been declared at namespace scope. If either
2702 is a member of an anonymous union, then this is an invalid
2703 redeclaration. For example:
2705 int i;
2706 union { int i; };
2708 is invalid. */
2709 if ((VAR_P (newdecl) && DECL_ANON_UNION_VAR_P (newdecl))
2710 || (VAR_P (olddecl) && DECL_ANON_UNION_VAR_P (olddecl)))
2711 return G_("redeclaration of %q#D");
2712 /* If at least one declaration is a reference, there is no
2713 conflict. For example:
2715 int i = 3;
2716 extern int i;
2718 is valid. */
2719 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2720 return NULL;
2721 /* Reject two definitions. */
2722 return G_("redefinition of %q#D");
2724 else
2726 /* Objects declared with block scope: */
2727 /* Reject two definitions, and reject a definition
2728 together with an external reference. */
2729 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2730 return G_("redeclaration of %q#D");
2731 return NULL;
2735 /* Hash and equality functions for the named_label table. */
2737 hashval_t
2738 named_label_hasher::hash (named_label_entry *ent)
2740 return DECL_UID (ent->label_decl);
2743 bool
2744 named_label_hasher::equal (named_label_entry *a, named_label_entry *b)
2746 return a->label_decl == b->label_decl;
2749 /* Create a new label, named ID. */
2751 static tree
2752 make_label_decl (tree id, int local_p)
2754 struct named_label_entry *ent;
2755 tree decl;
2757 decl = build_decl (input_location, LABEL_DECL, id, void_type_node);
2759 DECL_CONTEXT (decl) = current_function_decl;
2760 DECL_MODE (decl) = VOIDmode;
2761 C_DECLARED_LABEL_FLAG (decl) = local_p;
2763 /* Say where one reference is to the label, for the sake of the
2764 error if it is not defined. */
2765 DECL_SOURCE_LOCATION (decl) = input_location;
2767 /* Record the fact that this identifier is bound to this label. */
2768 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2770 /* Create the label htab for the function on demand. */
2771 if (!named_labels)
2772 named_labels = hash_table<named_label_hasher>::create_ggc (13);
2774 /* Record this label on the list of labels used in this function.
2775 We do this before calling make_label_decl so that we get the
2776 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2777 ent = ggc_cleared_alloc<named_label_entry> ();
2778 ent->label_decl = decl;
2780 named_label_entry **slot = named_labels->find_slot (ent, INSERT);
2781 gcc_assert (*slot == NULL);
2782 *slot = ent;
2784 return decl;
2787 /* Look for a label named ID in the current function. If one cannot
2788 be found, create one. (We keep track of used, but undefined,
2789 labels, and complain about them at the end of a function.) */
2791 static tree
2792 lookup_label_1 (tree id)
2794 tree decl;
2796 /* You can't use labels at global scope. */
2797 if (current_function_decl == NULL_TREE)
2799 error ("label %qE referenced outside of any function", id);
2800 return NULL_TREE;
2803 /* See if we've already got this label. */
2804 decl = IDENTIFIER_LABEL_VALUE (id);
2805 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2806 return decl;
2808 decl = make_label_decl (id, /*local_p=*/0);
2809 return decl;
2812 /* Wrapper for lookup_label_1. */
2814 tree
2815 lookup_label (tree id)
2817 tree ret;
2818 bool subtime = timevar_cond_start (TV_NAME_LOOKUP);
2819 ret = lookup_label_1 (id);
2820 timevar_cond_stop (TV_NAME_LOOKUP, subtime);
2821 return ret;
2824 /* Declare a local label named ID. */
2826 tree
2827 declare_local_label (tree id)
2829 tree decl;
2830 cp_label_binding bind;
2832 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2833 this scope we can restore the old value of IDENTIFIER_TYPE_VALUE. */
2834 bind.prev_value = IDENTIFIER_LABEL_VALUE (id);
2836 decl = make_label_decl (id, /*local_p=*/1);
2837 bind.label = decl;
2838 vec_safe_push (current_binding_level->shadowed_labels, bind);
2840 return decl;
2843 /* Returns nonzero if it is ill-formed to jump past the declaration of
2844 DECL. Returns 2 if it's also a real problem. */
2846 static int
2847 decl_jump_unsafe (tree decl)
2849 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
2850 with automatic storage duration is not in scope to a point where it is
2851 in scope is ill-formed unless the variable has scalar type, class type
2852 with a trivial default constructor and a trivial destructor, a
2853 cv-qualified version of one of these types, or an array of one of the
2854 preceding types and is declared without an initializer (8.5). */
2855 tree type = TREE_TYPE (decl);
2857 if (!VAR_P (decl) || TREE_STATIC (decl)
2858 || type == error_mark_node)
2859 return 0;
2861 if (DECL_NONTRIVIALLY_INITIALIZED_P (decl)
2862 || variably_modified_type_p (type, NULL_TREE))
2863 return 2;
2865 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
2866 return 1;
2868 return 0;
2871 /* A subroutine of check_previous_goto_1 to identify a branch to the user. */
2873 static bool
2874 identify_goto (tree decl, const location_t *locus)
2876 bool complained = (decl
2877 ? permerror (input_location, "jump to label %qD", decl)
2878 : permerror (input_location, "jump to case label"));
2879 if (complained && locus)
2880 inform (*locus, " from here");
2881 return complained;
2884 /* Check that a single previously seen jump to a newly defined label
2885 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2886 the jump context; NAMES are the names in scope in LEVEL at the jump
2887 context; LOCUS is the source position of the jump or 0. Returns
2888 true if all is well. */
2890 static bool
2891 check_previous_goto_1 (tree decl, cp_binding_level* level, tree names,
2892 bool exited_omp, const location_t *locus)
2894 cp_binding_level *b;
2895 bool identified = false, complained = false;
2896 bool saw_eh = false, saw_omp = false;
2898 if (exited_omp)
2900 complained = identify_goto (decl, locus);
2901 if (complained)
2902 inform (input_location, " exits OpenMP structured block");
2903 identified = saw_omp = true;
2906 for (b = current_binding_level; b ; b = b->level_chain)
2908 tree new_decls, old_decls = (b == level ? names : NULL_TREE);
2910 for (new_decls = b->names; new_decls != old_decls;
2911 new_decls = (DECL_P (new_decls) ? DECL_CHAIN (new_decls)
2912 : TREE_CHAIN (new_decls)))
2914 int problem = decl_jump_unsafe (new_decls);
2915 if (! problem)
2916 continue;
2918 if (!identified)
2920 complained = identify_goto (decl, locus);
2921 identified = true;
2923 if (complained)
2925 if (problem > 1)
2926 inform (input_location,
2927 " crosses initialization of %q+#D", new_decls);
2928 else
2929 inform (input_location, " enters scope of %q+#D which has "
2930 "non-trivial destructor", new_decls);
2934 if (b == level)
2935 break;
2936 if ((b->kind == sk_try || b->kind == sk_catch) && !saw_eh)
2938 if (!identified)
2940 complained = identify_goto (decl, locus);
2941 identified = true;
2943 if (complained)
2945 if (b->kind == sk_try)
2946 inform (input_location, " enters try block");
2947 else
2948 inform (input_location, " enters catch block");
2950 saw_eh = true;
2952 if (b->kind == sk_omp && !saw_omp)
2954 if (!identified)
2956 complained = identify_goto (decl, locus);
2957 identified = true;
2959 if (complained)
2960 inform (input_location, " enters OpenMP structured block");
2961 saw_omp = true;
2965 return !identified;
2968 static void
2969 check_previous_goto (tree decl, struct named_label_use_entry *use)
2971 check_previous_goto_1 (decl, use->binding_level,
2972 use->names_in_scope, use->in_omp_scope,
2973 &use->o_goto_locus);
2976 static bool
2977 check_switch_goto (cp_binding_level* level)
2979 return check_previous_goto_1 (NULL_TREE, level, level->names, false, NULL);
2982 /* Check that a new jump to a label DECL is OK. Called by
2983 finish_goto_stmt. */
2985 void
2986 check_goto (tree decl)
2988 struct named_label_entry *ent, dummy;
2989 bool saw_catch = false, identified = false, complained = false;
2990 tree bad;
2991 unsigned ix;
2993 /* We can't know where a computed goto is jumping.
2994 So we assume that it's OK. */
2995 if (TREE_CODE (decl) != LABEL_DECL)
2996 return;
2998 /* We didn't record any information about this label when we created it,
2999 and there's not much point since it's trivial to analyze as a return. */
3000 if (decl == cdtor_label)
3001 return;
3003 dummy.label_decl = decl;
3004 ent = named_labels->find (&dummy);
3005 gcc_assert (ent != NULL);
3007 /* If the label hasn't been defined yet, defer checking. */
3008 if (! DECL_INITIAL (decl))
3010 struct named_label_use_entry *new_use;
3012 /* Don't bother creating another use if the last goto had the
3013 same data, and will therefore create the same set of errors. */
3014 if (ent->uses
3015 && ent->uses->names_in_scope == current_binding_level->names)
3016 return;
3018 new_use = ggc_alloc<named_label_use_entry> ();
3019 new_use->binding_level = current_binding_level;
3020 new_use->names_in_scope = current_binding_level->names;
3021 new_use->o_goto_locus = input_location;
3022 new_use->in_omp_scope = false;
3024 new_use->next = ent->uses;
3025 ent->uses = new_use;
3026 return;
3029 if (ent->in_try_scope || ent->in_catch_scope
3030 || ent->in_omp_scope || !vec_safe_is_empty (ent->bad_decls))
3032 complained = permerror (input_location, "jump to label %q+D", decl);
3033 if (complained)
3034 inform (input_location, " from here");
3035 identified = true;
3038 FOR_EACH_VEC_SAFE_ELT (ent->bad_decls, ix, bad)
3040 int u = decl_jump_unsafe (bad);
3042 if (u > 1 && DECL_ARTIFICIAL (bad))
3044 /* Can't skip init of __exception_info. */
3045 if (complained)
3046 inform (DECL_SOURCE_LOCATION (bad), " enters catch block");
3047 saw_catch = true;
3049 else if (complained)
3051 if (u > 1)
3052 inform (input_location, " skips initialization of %q+#D", bad);
3053 else
3054 inform (input_location, " enters scope of %q+#D which has "
3055 "non-trivial destructor", bad);
3059 if (complained)
3061 if (ent->in_try_scope)
3062 inform (input_location, " enters try block");
3063 else if (ent->in_catch_scope && !saw_catch)
3064 inform (input_location, " enters catch block");
3067 if (ent->in_omp_scope)
3069 if (complained)
3070 inform (input_location, " enters OpenMP structured block");
3072 else if (flag_openmp)
3074 cp_binding_level *b;
3075 for (b = current_binding_level; b ; b = b->level_chain)
3077 if (b == ent->binding_level)
3078 break;
3079 if (b->kind == sk_omp)
3081 if (!identified)
3083 complained = permerror (input_location,
3084 "jump to label %q+D", decl);
3085 if (complained)
3086 inform (input_location, " from here");
3087 identified = true;
3089 if (complained)
3090 inform (input_location, " exits OpenMP structured block");
3091 break;
3097 /* Check that a return is ok wrt OpenMP structured blocks.
3098 Called by finish_return_stmt. Returns true if all is well. */
3100 bool
3101 check_omp_return (void)
3103 cp_binding_level *b;
3104 for (b = current_binding_level; b ; b = b->level_chain)
3105 if (b->kind == sk_omp)
3107 error ("invalid exit from OpenMP structured block");
3108 return false;
3110 else if (b->kind == sk_function_parms)
3111 break;
3112 return true;
3115 /* Define a label, specifying the location in the source file.
3116 Return the LABEL_DECL node for the label. */
3118 static tree
3119 define_label_1 (location_t location, tree name)
3121 struct named_label_entry *ent, dummy;
3122 cp_binding_level *p;
3123 tree decl;
3125 decl = lookup_label (name);
3127 dummy.label_decl = decl;
3128 ent = named_labels->find (&dummy);
3129 gcc_assert (ent != NULL);
3131 /* After labels, make any new cleanups in the function go into their
3132 own new (temporary) binding contour. */
3133 for (p = current_binding_level;
3134 p->kind != sk_function_parms;
3135 p = p->level_chain)
3136 p->more_cleanups_ok = 0;
3138 if (name == get_identifier ("wchar_t"))
3139 permerror (input_location, "label named wchar_t");
3141 if (DECL_INITIAL (decl) != NULL_TREE)
3143 error ("duplicate label %qD", decl);
3144 return error_mark_node;
3146 else
3148 struct named_label_use_entry *use;
3150 /* Mark label as having been defined. */
3151 DECL_INITIAL (decl) = error_mark_node;
3152 /* Say where in the source. */
3153 DECL_SOURCE_LOCATION (decl) = location;
3155 ent->binding_level = current_binding_level;
3156 ent->names_in_scope = current_binding_level->names;
3158 for (use = ent->uses; use ; use = use->next)
3159 check_previous_goto (decl, use);
3160 ent->uses = NULL;
3163 return decl;
3166 /* Wrapper for define_label_1. */
3168 tree
3169 define_label (location_t location, tree name)
3171 tree ret;
3172 bool running = timevar_cond_start (TV_NAME_LOOKUP);
3173 ret = define_label_1 (location, name);
3174 timevar_cond_stop (TV_NAME_LOOKUP, running);
3175 return ret;
3179 struct cp_switch
3181 cp_binding_level *level;
3182 struct cp_switch *next;
3183 /* The SWITCH_STMT being built. */
3184 tree switch_stmt;
3185 /* A splay-tree mapping the low element of a case range to the high
3186 element, or NULL_TREE if there is no high element. Used to
3187 determine whether or not a new case label duplicates an old case
3188 label. We need a tree, rather than simply a hash table, because
3189 of the GNU case range extension. */
3190 splay_tree cases;
3193 /* A stack of the currently active switch statements. The innermost
3194 switch statement is on the top of the stack. There is no need to
3195 mark the stack for garbage collection because it is only active
3196 during the processing of the body of a function, and we never
3197 collect at that point. */
3199 static struct cp_switch *switch_stack;
3201 /* Called right after a switch-statement condition is parsed.
3202 SWITCH_STMT is the switch statement being parsed. */
3204 void
3205 push_switch (tree switch_stmt)
3207 struct cp_switch *p = XNEW (struct cp_switch);
3208 p->level = current_binding_level;
3209 p->next = switch_stack;
3210 p->switch_stmt = switch_stmt;
3211 p->cases = splay_tree_new (case_compare, NULL, NULL);
3212 switch_stack = p;
3215 void
3216 pop_switch (void)
3218 struct cp_switch *cs = switch_stack;
3219 location_t switch_location;
3221 /* Emit warnings as needed. */
3222 switch_location = EXPR_LOC_OR_LOC (cs->switch_stmt, input_location);
3223 if (!processing_template_decl)
3224 c_do_switch_warnings (cs->cases, switch_location,
3225 SWITCH_STMT_TYPE (cs->switch_stmt),
3226 SWITCH_STMT_COND (cs->switch_stmt));
3228 splay_tree_delete (cs->cases);
3229 switch_stack = switch_stack->next;
3230 free (cs);
3233 /* Convert a case constant VALUE in a switch to the type TYPE of the switch
3234 condition. Note that if TYPE and VALUE are already integral we don't
3235 really do the conversion because the language-independent
3236 warning/optimization code will work better that way. */
3238 static tree
3239 case_conversion (tree type, tree value)
3241 if (value == NULL_TREE)
3242 return value;
3244 if (cxx_dialect >= cxx11
3245 && (SCOPED_ENUM_P (type)
3246 || !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (value))))
3248 if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
3249 type = type_promotes_to (type);
3250 value = (perform_implicit_conversion_flags
3251 (type, value, tf_warning_or_error,
3252 LOOKUP_IMPLICIT | LOOKUP_NO_NON_INTEGRAL));
3254 return cxx_constant_value (value);
3257 /* Note that we've seen a definition of a case label, and complain if this
3258 is a bad place for one. */
3260 tree
3261 finish_case_label (location_t loc, tree low_value, tree high_value)
3263 tree cond, r;
3264 cp_binding_level *p;
3265 tree type;
3267 if (processing_template_decl)
3269 tree label;
3271 /* For templates, just add the case label; we'll do semantic
3272 analysis at instantiation-time. */
3273 label = build_decl (loc, LABEL_DECL, NULL_TREE, NULL_TREE);
3274 return add_stmt (build_case_label (low_value, high_value, label));
3277 /* Find the condition on which this switch statement depends. */
3278 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
3279 if (cond && TREE_CODE (cond) == TREE_LIST)
3280 cond = TREE_VALUE (cond);
3282 if (!check_switch_goto (switch_stack->level))
3283 return error_mark_node;
3285 type = SWITCH_STMT_TYPE (switch_stack->switch_stmt);
3287 low_value = case_conversion (type, low_value);
3288 high_value = case_conversion (type, high_value);
3290 r = c_add_case_label (loc, switch_stack->cases, cond, type,
3291 low_value, high_value);
3293 /* After labels, make any new cleanups in the function go into their
3294 own new (temporary) binding contour. */
3295 for (p = current_binding_level;
3296 p->kind != sk_function_parms;
3297 p = p->level_chain)
3298 p->more_cleanups_ok = 0;
3300 return r;
3303 struct typename_info {
3304 tree scope;
3305 tree name;
3306 tree template_id;
3307 bool enum_p;
3308 bool class_p;
3311 struct typename_hasher : ggc_hasher<tree>
3313 typedef typename_info *compare_type;
3315 /* Hash a TYPENAME_TYPE. */
3317 static hashval_t
3318 hash (tree t)
3320 hashval_t hash;
3322 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
3323 ^ htab_hash_pointer (TYPE_IDENTIFIER (t)));
3325 return hash;
3328 /* Compare two TYPENAME_TYPEs. */
3330 static bool
3331 equal (tree t1, const typename_info *t2)
3333 return (TYPE_IDENTIFIER (t1) == t2->name
3334 && TYPE_CONTEXT (t1) == t2->scope
3335 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
3336 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
3337 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
3341 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
3342 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
3344 Returns the new TYPENAME_TYPE. */
3346 static GTY (()) hash_table<typename_hasher> *typename_htab;
3348 static tree
3349 build_typename_type (tree context, tree name, tree fullname,
3350 enum tag_types tag_type)
3352 tree t;
3353 tree d;
3354 typename_info ti;
3355 tree *e;
3356 hashval_t hash;
3358 if (typename_htab == NULL)
3359 typename_htab = hash_table<typename_hasher>::create_ggc (61);
3361 ti.scope = FROB_CONTEXT (context);
3362 ti.name = name;
3363 ti.template_id = fullname;
3364 ti.enum_p = tag_type == enum_type;
3365 ti.class_p = (tag_type == class_type
3366 || tag_type == record_type
3367 || tag_type == union_type);
3368 hash = (htab_hash_pointer (ti.scope)
3369 ^ htab_hash_pointer (ti.name));
3371 /* See if we already have this type. */
3372 e = typename_htab->find_slot_with_hash (&ti, hash, INSERT);
3373 if (*e)
3374 t = *e;
3375 else
3377 /* Build the TYPENAME_TYPE. */
3378 t = cxx_make_type (TYPENAME_TYPE);
3379 TYPE_CONTEXT (t) = ti.scope;
3380 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
3381 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
3382 TYPENAME_IS_CLASS_P (t) = ti.class_p;
3384 /* Build the corresponding TYPE_DECL. */
3385 d = build_decl (input_location, TYPE_DECL, name, t);
3386 TYPE_NAME (TREE_TYPE (d)) = d;
3387 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3388 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3389 DECL_ARTIFICIAL (d) = 1;
3391 /* Store it in the hash table. */
3392 *e = t;
3394 /* TYPENAME_TYPEs must always be compared structurally, because
3395 they may or may not resolve down to another type depending on
3396 the currently open classes. */
3397 SET_TYPE_STRUCTURAL_EQUALITY (t);
3400 return t;
3403 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
3404 provided to name the type. Returns an appropriate type, unless an
3405 error occurs, in which case error_mark_node is returned. If we
3406 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
3407 return that, rather than the _TYPE it corresponds to, in other
3408 cases we look through the type decl. If TF_ERROR is set, complain
3409 about errors, otherwise be quiet. */
3411 tree
3412 make_typename_type (tree context, tree name, enum tag_types tag_type,
3413 tsubst_flags_t complain)
3415 tree fullname;
3416 tree t;
3417 bool want_template;
3419 if (name == error_mark_node
3420 || context == NULL_TREE
3421 || context == error_mark_node)
3422 return error_mark_node;
3424 if (TYPE_P (name))
3426 if (!(TYPE_LANG_SPECIFIC (name)
3427 && (CLASSTYPE_IS_TEMPLATE (name)
3428 || CLASSTYPE_USE_TEMPLATE (name))))
3429 name = TYPE_IDENTIFIER (name);
3430 else
3431 /* Create a TEMPLATE_ID_EXPR for the type. */
3432 name = build_nt (TEMPLATE_ID_EXPR,
3433 CLASSTYPE_TI_TEMPLATE (name),
3434 CLASSTYPE_TI_ARGS (name));
3436 else if (TREE_CODE (name) == TYPE_DECL)
3437 name = DECL_NAME (name);
3439 fullname = name;
3441 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
3443 name = TREE_OPERAND (name, 0);
3444 if (TREE_CODE (name) == TEMPLATE_DECL)
3445 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
3446 else if (TREE_CODE (name) == OVERLOAD)
3448 if (complain & tf_error)
3449 error ("%qD is not a type", name);
3450 return error_mark_node;
3453 if (TREE_CODE (name) == TEMPLATE_DECL)
3455 if (complain & tf_error)
3456 error ("%qD used without template parameters", name);
3457 return error_mark_node;
3459 gcc_assert (identifier_p (name));
3460 gcc_assert (TYPE_P (context));
3462 if (!MAYBE_CLASS_TYPE_P (context))
3464 if (complain & tf_error)
3465 error ("%q#T is not a class", context);
3466 return error_mark_node;
3469 /* When the CONTEXT is a dependent type, NAME could refer to a
3470 dependent base class of CONTEXT. But look inside it anyway
3471 if CONTEXT is a currently open scope, in case it refers to a
3472 member of the current instantiation or a non-dependent base;
3473 lookup will stop when we hit a dependent base. */
3474 if (!dependent_scope_p (context))
3475 /* We should only set WANT_TYPE when we're a nested typename type.
3476 Then we can give better diagnostics if we find a non-type. */
3477 t = lookup_field (context, name, 2, /*want_type=*/true);
3478 else
3479 t = NULL_TREE;
3481 if ((!t || TREE_CODE (t) == TREE_LIST) && dependent_type_p (context))
3482 return build_typename_type (context, name, fullname, tag_type);
3484 want_template = TREE_CODE (fullname) == TEMPLATE_ID_EXPR;
3486 if (!t)
3488 if (complain & tf_error)
3489 error (want_template ? G_("no class template named %q#T in %q#T")
3490 : G_("no type named %q#T in %q#T"), name, context);
3491 return error_mark_node;
3494 /* Pull out the template from an injected-class-name (or multiple). */
3495 if (want_template)
3496 t = maybe_get_template_decl_from_type_decl (t);
3498 if (TREE_CODE (t) == TREE_LIST)
3500 if (complain & tf_error)
3502 error ("lookup of %qT in %qT is ambiguous", name, context);
3503 print_candidates (t);
3505 return error_mark_node;
3508 if (want_template && !DECL_TYPE_TEMPLATE_P (t))
3510 if (complain & tf_error)
3511 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3512 context, name, t);
3513 return error_mark_node;
3515 if (!want_template && TREE_CODE (t) != TYPE_DECL)
3517 if (complain & tf_error)
3518 error ("%<typename %T::%D%> names %q#T, which is not a type",
3519 context, name, t);
3520 return error_mark_node;
3523 if (!perform_or_defer_access_check (TYPE_BINFO (context), t, t, complain))
3524 return error_mark_node;
3526 /* If we are currently parsing a template and if T is a typedef accessed
3527 through CONTEXT then we need to remember and check access of T at
3528 template instantiation time. */
3529 add_typedef_to_current_template_for_access_check (t, context, input_location);
3531 if (want_template)
3532 return lookup_template_class (t, TREE_OPERAND (fullname, 1),
3533 NULL_TREE, context,
3534 /*entering_scope=*/0,
3535 tf_warning_or_error | tf_user);
3537 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
3538 t = TREE_TYPE (t);
3540 maybe_record_typedef_use (t);
3542 return t;
3545 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3546 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3547 in which case error_mark_node is returned.
3549 If PARM_LIST is non-NULL, also make sure that the template parameter
3550 list of TEMPLATE_DECL matches.
3552 If COMPLAIN zero, don't complain about any errors that occur. */
3554 tree
3555 make_unbound_class_template (tree context, tree name, tree parm_list,
3556 tsubst_flags_t complain)
3558 tree t;
3559 tree d;
3561 if (TYPE_P (name))
3562 name = TYPE_IDENTIFIER (name);
3563 else if (DECL_P (name))
3564 name = DECL_NAME (name);
3565 gcc_assert (identifier_p (name));
3567 if (!dependent_type_p (context)
3568 || currently_open_class (context))
3570 tree tmpl = NULL_TREE;
3572 if (MAYBE_CLASS_TYPE_P (context))
3573 tmpl = lookup_field (context, name, 0, false);
3575 if (tmpl && TREE_CODE (tmpl) == TYPE_DECL)
3576 tmpl = maybe_get_template_decl_from_type_decl (tmpl);
3578 if (!tmpl || !DECL_TYPE_TEMPLATE_P (tmpl))
3580 if (complain & tf_error)
3581 error ("no class template named %q#T in %q#T", name, context);
3582 return error_mark_node;
3585 if (parm_list
3586 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
3588 if (complain & tf_error)
3590 error ("template parameters do not match template %qD", tmpl);
3591 inform (DECL_SOURCE_LOCATION (tmpl),
3592 "%qD declared here", tmpl);
3594 return error_mark_node;
3597 if (!perform_or_defer_access_check (TYPE_BINFO (context), tmpl, tmpl,
3598 complain))
3599 return error_mark_node;
3601 return tmpl;
3604 /* Build the UNBOUND_CLASS_TEMPLATE. */
3605 t = cxx_make_type (UNBOUND_CLASS_TEMPLATE);
3606 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
3607 TREE_TYPE (t) = NULL_TREE;
3608 SET_TYPE_STRUCTURAL_EQUALITY (t);
3610 /* Build the corresponding TEMPLATE_DECL. */
3611 d = build_decl (input_location, TEMPLATE_DECL, name, t);
3612 TYPE_NAME (TREE_TYPE (d)) = d;
3613 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3614 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3615 DECL_ARTIFICIAL (d) = 1;
3616 DECL_TEMPLATE_PARMS (d) = parm_list;
3618 return t;
3623 /* Push the declarations of builtin types into the namespace.
3624 RID_INDEX is the index of the builtin type in the array
3625 RID_POINTERS. NAME is the name used when looking up the builtin
3626 type. TYPE is the _TYPE node for the builtin type. */
3628 void
3629 record_builtin_type (enum rid rid_index,
3630 const char* name,
3631 tree type)
3633 tree rname = NULL_TREE, tname = NULL_TREE;
3634 tree tdecl = NULL_TREE;
3636 if ((int) rid_index < (int) RID_MAX)
3637 rname = ridpointers[(int) rid_index];
3638 if (name)
3639 tname = get_identifier (name);
3641 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
3642 eliminated. Built-in types should not be looked up name; their
3643 names are keywords that the parser can recognize. However, there
3644 is code in c-common.c that uses identifier_global_value to look
3645 up built-in types by name. */
3646 if (tname)
3648 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, tname, type);
3649 DECL_ARTIFICIAL (tdecl) = 1;
3650 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
3652 if (rname)
3654 if (!tdecl)
3656 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, rname, type);
3657 DECL_ARTIFICIAL (tdecl) = 1;
3659 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
3662 if (!TYPE_NAME (type))
3663 TYPE_NAME (type) = tdecl;
3665 if (tdecl)
3666 debug_hooks->type_decl (tdecl, 0);
3669 /* Record one of the standard Java types.
3670 * Declare it as having the given NAME.
3671 * If SIZE > 0, it is the size of one of the integral types;
3672 * otherwise it is the negative of the size of one of the other types. */
3674 static tree
3675 record_builtin_java_type (const char* name, int size)
3677 tree type, decl;
3678 if (size > 0)
3680 type = build_nonstandard_integer_type (size, 0);
3681 type = build_distinct_type_copy (type);
3683 else if (size > -32)
3685 tree stype;
3686 /* "__java_char" or ""__java_boolean". */
3687 type = build_nonstandard_integer_type (-size, 1);
3688 type = build_distinct_type_copy (type);
3689 /* Get the signed type cached and attached to the unsigned type,
3690 so it doesn't get garbage-collected at "random" times,
3691 causing potential codegen differences out of different UIDs
3692 and different alias set numbers. */
3693 stype = build_nonstandard_integer_type (-size, 0);
3694 stype = build_distinct_type_copy (stype);
3695 TREE_CHAIN (type) = stype;
3696 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
3698 else
3699 { /* "__java_float" or ""__java_double". */
3700 type = make_node (REAL_TYPE);
3701 TYPE_PRECISION (type) = - size;
3702 layout_type (type);
3704 record_builtin_type (RID_MAX, name, type);
3705 decl = TYPE_NAME (type);
3707 /* Suppress generate debug symbol entries for these types,
3708 since for normal C++ they are just clutter.
3709 However, push_lang_context undoes this if extern "Java" is seen. */
3710 DECL_IGNORED_P (decl) = 1;
3712 TYPE_FOR_JAVA (type) = 1;
3713 return type;
3716 /* Push a type into the namespace so that the back ends ignore it. */
3718 static void
3719 record_unknown_type (tree type, const char* name)
3721 tree decl = pushdecl (build_decl (UNKNOWN_LOCATION,
3722 TYPE_DECL, get_identifier (name), type));
3723 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3724 DECL_IGNORED_P (decl) = 1;
3725 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
3726 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
3727 TYPE_ALIGN (type) = 1;
3728 TYPE_USER_ALIGN (type) = 0;
3729 SET_TYPE_MODE (type, TYPE_MODE (void_type_node));
3732 /* A string for which we should create an IDENTIFIER_NODE at
3733 startup. */
3735 typedef struct predefined_identifier
3737 /* The name of the identifier. */
3738 const char *const name;
3739 /* The place where the IDENTIFIER_NODE should be stored. */
3740 tree *const node;
3741 /* Nonzero if this is the name of a constructor or destructor. */
3742 const int ctor_or_dtor_p;
3743 } predefined_identifier;
3745 /* Create all the predefined identifiers. */
3747 static void
3748 initialize_predefined_identifiers (void)
3750 const predefined_identifier *pid;
3752 /* A table of identifiers to create at startup. */
3753 static const predefined_identifier predefined_identifiers[] = {
3754 { "C++", &lang_name_cplusplus, 0 },
3755 { "C", &lang_name_c, 0 },
3756 { "Java", &lang_name_java, 0 },
3757 /* Some of these names have a trailing space so that it is
3758 impossible for them to conflict with names written by users. */
3759 { "__ct ", &ctor_identifier, 1 },
3760 { "__base_ctor ", &base_ctor_identifier, 1 },
3761 { "__comp_ctor ", &complete_ctor_identifier, 1 },
3762 { "__dt ", &dtor_identifier, 1 },
3763 { "__comp_dtor ", &complete_dtor_identifier, 1 },
3764 { "__base_dtor ", &base_dtor_identifier, 1 },
3765 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
3766 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
3767 { "nelts", &nelts_identifier, 0 },
3768 { THIS_NAME, &this_identifier, 0 },
3769 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
3770 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
3771 { "_vptr", &vptr_identifier, 0 },
3772 { "__vtt_parm", &vtt_parm_identifier, 0 },
3773 { "::", &global_scope_name, 0 },
3774 { "std", &std_identifier, 0 },
3775 { NULL, NULL, 0 }
3778 for (pid = predefined_identifiers; pid->name; ++pid)
3780 *pid->node = get_identifier (pid->name);
3781 if (pid->ctor_or_dtor_p)
3782 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
3786 /* Create the predefined scalar types of C,
3787 and some nodes representing standard constants (0, 1, (void *)0).
3788 Initialize the global binding level.
3789 Make definitions for built-in primitive functions. */
3791 void
3792 cxx_init_decl_processing (void)
3794 tree void_ftype;
3795 tree void_ftype_ptr;
3797 /* Create all the identifiers we need. */
3798 initialize_predefined_identifiers ();
3800 /* Create the global variables. */
3801 push_to_top_level ();
3803 current_function_decl = NULL_TREE;
3804 current_binding_level = NULL;
3805 /* Enter the global namespace. */
3806 gcc_assert (global_namespace == NULL_TREE);
3807 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
3808 void_type_node);
3809 DECL_CONTEXT (global_namespace) = build_translation_unit_decl (NULL_TREE);
3810 TREE_PUBLIC (global_namespace) = 1;
3811 begin_scope (sk_namespace, global_namespace);
3813 if (flag_visibility_ms_compat)
3814 default_visibility = VISIBILITY_HIDDEN;
3816 /* Initially, C. */
3817 current_lang_name = lang_name_c;
3819 /* Create the `std' namespace. */
3820 push_namespace (std_identifier);
3821 std_node = current_namespace;
3822 pop_namespace ();
3824 c_common_nodes_and_builtins ();
3826 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
3827 java_short_type_node = record_builtin_java_type ("__java_short", 16);
3828 java_int_type_node = record_builtin_java_type ("__java_int", 32);
3829 java_long_type_node = record_builtin_java_type ("__java_long", 64);
3830 java_float_type_node = record_builtin_java_type ("__java_float", -32);
3831 java_double_type_node = record_builtin_java_type ("__java_double", -64);
3832 java_char_type_node = record_builtin_java_type ("__java_char", -16);
3833 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
3835 integer_two_node = build_int_cst (NULL_TREE, 2);
3837 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
3838 truthvalue_type_node = boolean_type_node;
3839 truthvalue_false_node = boolean_false_node;
3840 truthvalue_true_node = boolean_true_node;
3842 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
3843 noexcept_true_spec = build_tree_list (boolean_true_node, NULL_TREE);
3844 noexcept_false_spec = build_tree_list (boolean_false_node, NULL_TREE);
3846 #if 0
3847 record_builtin_type (RID_MAX, NULL, string_type_node);
3848 #endif
3850 delta_type_node = ptrdiff_type_node;
3851 vtable_index_type = ptrdiff_type_node;
3853 vtt_parm_type = build_pointer_type (const_ptr_type_node);
3854 void_ftype = build_function_type_list (void_type_node, NULL_TREE);
3855 void_ftype_ptr = build_function_type_list (void_type_node,
3856 ptr_type_node, NULL_TREE);
3857 void_ftype_ptr
3858 = build_exception_variant (void_ftype_ptr, empty_except_spec);
3860 /* C++ extensions */
3862 unknown_type_node = make_node (LANG_TYPE);
3863 record_unknown_type (unknown_type_node, "unknown type");
3865 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3866 TREE_TYPE (unknown_type_node) = unknown_type_node;
3868 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3869 result. */
3870 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
3871 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
3873 init_list_type_node = make_node (LANG_TYPE);
3874 record_unknown_type (init_list_type_node, "init list");
3877 /* Make sure we get a unique function type, so we can give
3878 its pointer type a name. (This wins for gdb.) */
3879 tree vfunc_type = make_node (FUNCTION_TYPE);
3880 TREE_TYPE (vfunc_type) = integer_type_node;
3881 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
3882 layout_type (vfunc_type);
3884 vtable_entry_type = build_pointer_type (vfunc_type);
3886 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
3888 vtbl_type_node
3889 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
3890 layout_type (vtbl_type_node);
3891 vtbl_type_node = cp_build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
3892 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
3893 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
3894 layout_type (vtbl_ptr_type_node);
3895 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
3897 push_namespace (get_identifier ("__cxxabiv1"));
3898 abi_node = current_namespace;
3899 pop_namespace ();
3901 global_type_node = make_node (LANG_TYPE);
3902 record_unknown_type (global_type_node, "global type");
3904 /* Now, C++. */
3905 current_lang_name = lang_name_cplusplus;
3908 tree newattrs, extvisattr;
3909 tree newtype, deltype;
3910 tree ptr_ftype_sizetype;
3911 tree new_eh_spec;
3913 ptr_ftype_sizetype
3914 = build_function_type_list (ptr_type_node, size_type_node, NULL_TREE);
3915 if (cxx_dialect == cxx98)
3917 tree bad_alloc_id;
3918 tree bad_alloc_type_node;
3919 tree bad_alloc_decl;
3921 push_namespace (std_identifier);
3922 bad_alloc_id = get_identifier ("bad_alloc");
3923 bad_alloc_type_node = make_class_type (RECORD_TYPE);
3924 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3925 bad_alloc_decl
3926 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3927 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3928 pop_namespace ();
3930 new_eh_spec
3931 = add_exception_specifier (NULL_TREE, bad_alloc_type_node, -1);
3933 else
3934 new_eh_spec = noexcept_false_spec;
3936 /* Ensure attribs.c is initialized. */
3937 init_attributes ();
3938 extvisattr = build_tree_list (get_identifier ("externally_visible"),
3939 NULL_TREE);
3940 newattrs = tree_cons (get_identifier ("alloc_size"),
3941 build_tree_list (NULL_TREE, integer_one_node),
3942 extvisattr);
3943 newtype = cp_build_type_attribute_variant (ptr_ftype_sizetype, newattrs);
3944 newtype = build_exception_variant (newtype, new_eh_spec);
3945 deltype = cp_build_type_attribute_variant (void_ftype_ptr, extvisattr);
3946 deltype = build_exception_variant (deltype, empty_except_spec);
3947 tree opnew = push_cp_library_fn (NEW_EXPR, newtype, 0);
3948 DECL_IS_MALLOC (opnew) = 1;
3949 DECL_IS_OPERATOR_NEW (opnew) = 1;
3950 opnew = push_cp_library_fn (VEC_NEW_EXPR, newtype, 0);
3951 DECL_IS_MALLOC (opnew) = 1;
3952 DECL_IS_OPERATOR_NEW (opnew) = 1;
3953 push_cp_library_fn (DELETE_EXPR, deltype, ECF_NOTHROW);
3954 push_cp_library_fn (VEC_DELETE_EXPR, deltype, ECF_NOTHROW);
3955 if (flag_sized_deallocation)
3957 /* Also push the sized deallocation variants:
3958 void operator delete(void*, std::size_t) throw();
3959 void operator delete[](void*, std::size_t) throw(); */
3960 tree void_ftype_ptr_size
3961 = build_function_type_list (void_type_node, ptr_type_node,
3962 size_type_node, NULL_TREE);
3963 deltype = cp_build_type_attribute_variant (void_ftype_ptr_size,
3964 extvisattr);
3965 deltype = build_exception_variant (deltype, empty_except_spec);
3966 push_cp_library_fn (DELETE_EXPR, deltype, ECF_NOTHROW);
3967 push_cp_library_fn (VEC_DELETE_EXPR, deltype, ECF_NOTHROW);
3970 nullptr_type_node = make_node (NULLPTR_TYPE);
3971 TYPE_SIZE (nullptr_type_node) = bitsize_int (GET_MODE_BITSIZE (ptr_mode));
3972 TYPE_SIZE_UNIT (nullptr_type_node) = size_int (GET_MODE_SIZE (ptr_mode));
3973 TYPE_UNSIGNED (nullptr_type_node) = 1;
3974 TYPE_PRECISION (nullptr_type_node) = GET_MODE_BITSIZE (ptr_mode);
3975 SET_TYPE_MODE (nullptr_type_node, ptr_mode);
3976 record_builtin_type (RID_MAX, "decltype(nullptr)", nullptr_type_node);
3977 nullptr_node = build_int_cst (nullptr_type_node, 0);
3980 abort_fndecl
3981 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype,
3982 ECF_NORETURN | ECF_NOTHROW);
3984 /* Perform other language dependent initializations. */
3985 init_class_processing ();
3986 init_rtti_processing ();
3987 init_template_processing ();
3989 if (flag_exceptions)
3990 init_exception_processing ();
3992 if (! supports_one_only ())
3993 flag_weak = 0;
3995 make_fname_decl = cp_make_fname_decl;
3996 start_fname_decls ();
3998 /* Show we use EH for cleanups. */
3999 if (flag_exceptions)
4000 using_eh_for_cleanups ();
4003 /* Generate an initializer for a function naming variable from
4004 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
4005 filled in with the type of the init. */
4007 tree
4008 cp_fname_init (const char* name, tree *type_p)
4010 tree domain = NULL_TREE;
4011 tree type;
4012 tree init = NULL_TREE;
4013 size_t length = 0;
4015 if (name)
4017 length = strlen (name);
4018 domain = build_index_type (size_int (length));
4019 init = build_string (length + 1, name);
4022 type = cp_build_qualified_type (char_type_node, TYPE_QUAL_CONST);
4023 type = build_cplus_array_type (type, domain);
4025 *type_p = type;
4027 if (init)
4028 TREE_TYPE (init) = type;
4029 else
4030 init = error_mark_node;
4032 return init;
4035 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
4036 the decl, LOC is the location to give the decl, NAME is the
4037 initialization string and TYPE_DEP indicates whether NAME depended
4038 on the type of the function. We make use of that to detect
4039 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
4040 at the point of first use, so we mustn't push the decl now. */
4042 static tree
4043 cp_make_fname_decl (location_t loc, tree id, int type_dep)
4045 const char *const name = (type_dep && processing_template_decl
4046 ? NULL : fname_as_string (type_dep));
4047 tree type;
4048 tree init = cp_fname_init (name, &type);
4049 tree decl = build_decl (loc, VAR_DECL, id, type);
4051 if (name)
4052 free (CONST_CAST (char *, name));
4054 /* As we're using pushdecl_with_scope, we must set the context. */
4055 DECL_CONTEXT (decl) = current_function_decl;
4057 TREE_STATIC (decl) = 1;
4058 TREE_READONLY (decl) = 1;
4059 DECL_ARTIFICIAL (decl) = 1;
4061 TREE_USED (decl) = 1;
4063 if (current_function_decl)
4065 cp_binding_level *b = current_binding_level;
4066 if (b->kind == sk_function_parms)
4067 return error_mark_node;
4068 while (b->level_chain->kind != sk_function_parms)
4069 b = b->level_chain;
4070 pushdecl_with_scope (decl, b, /*is_friend=*/false);
4071 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, NULL_TREE,
4072 LOOKUP_ONLYCONVERTING);
4074 else
4076 DECL_THIS_STATIC (decl) = true;
4077 pushdecl_top_level_and_finish (decl, init);
4080 return decl;
4083 static tree
4084 builtin_function_1 (tree decl, tree context, bool is_global)
4086 tree id = DECL_NAME (decl);
4087 const char *name = IDENTIFIER_POINTER (id);
4089 retrofit_lang_decl (decl);
4091 DECL_ARTIFICIAL (decl) = 1;
4092 SET_OVERLOADED_OPERATOR_CODE (decl, ERROR_MARK);
4093 SET_DECL_LANGUAGE (decl, lang_c);
4094 /* Runtime library routines are, by definition, available in an
4095 external shared object. */
4096 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
4097 DECL_VISIBILITY_SPECIFIED (decl) = 1;
4099 DECL_CONTEXT (decl) = context;
4101 if (is_global)
4102 pushdecl_top_level (decl);
4103 else
4104 pushdecl (decl);
4106 /* A function in the user's namespace should have an explicit
4107 declaration before it is used. Mark the built-in function as
4108 anticipated but not actually declared. */
4109 if (name[0] != '_' || name[1] != '_')
4110 DECL_ANTICIPATED (decl) = 1;
4111 else if (strncmp (name + 2, "builtin_", strlen ("builtin_")) != 0)
4113 size_t len = strlen (name);
4115 /* Treat __*_chk fortification functions as anticipated as well,
4116 unless they are __builtin_*. */
4117 if (len > strlen ("___chk")
4118 && memcmp (name + len - strlen ("_chk"),
4119 "_chk", strlen ("_chk") + 1) == 0)
4120 DECL_ANTICIPATED (decl) = 1;
4123 return decl;
4126 tree
4127 cxx_builtin_function (tree decl)
4129 tree id = DECL_NAME (decl);
4130 const char *name = IDENTIFIER_POINTER (id);
4131 /* All builtins that don't begin with an '_' should additionally
4132 go in the 'std' namespace. */
4133 if (name[0] != '_')
4135 tree decl2 = copy_node(decl);
4136 push_namespace (std_identifier);
4137 builtin_function_1 (decl2, std_node, false);
4138 pop_namespace ();
4141 return builtin_function_1 (decl, NULL_TREE, false);
4144 /* Like cxx_builtin_function, but guarantee the function is added to the global
4145 scope. This is to allow function specific options to add new machine
4146 dependent builtins when the target ISA changes via attribute((target(...)))
4147 which saves space on program startup if the program does not use non-generic
4148 ISAs. */
4150 tree
4151 cxx_builtin_function_ext_scope (tree decl)
4154 tree id = DECL_NAME (decl);
4155 const char *name = IDENTIFIER_POINTER (id);
4156 /* All builtins that don't begin with an '_' should additionally
4157 go in the 'std' namespace. */
4158 if (name[0] != '_')
4160 tree decl2 = copy_node(decl);
4161 push_namespace (std_identifier);
4162 builtin_function_1 (decl2, std_node, true);
4163 pop_namespace ();
4166 return builtin_function_1 (decl, NULL_TREE, true);
4169 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
4170 function. Not called directly. */
4172 static tree
4173 build_library_fn (tree name, enum tree_code operator_code, tree type,
4174 int ecf_flags)
4176 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
4177 DECL_EXTERNAL (fn) = 1;
4178 TREE_PUBLIC (fn) = 1;
4179 DECL_ARTIFICIAL (fn) = 1;
4180 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
4181 SET_DECL_LANGUAGE (fn, lang_c);
4182 /* Runtime library routines are, by definition, available in an
4183 external shared object. */
4184 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
4185 DECL_VISIBILITY_SPECIFIED (fn) = 1;
4186 set_call_expr_flags (fn, ecf_flags);
4187 return fn;
4190 /* Returns the _DECL for a library function with C++ linkage. */
4192 static tree
4193 build_cp_library_fn (tree name, enum tree_code operator_code, tree type,
4194 int ecf_flags)
4196 tree fn = build_library_fn (name, operator_code, type, ecf_flags);
4197 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
4198 SET_DECL_LANGUAGE (fn, lang_cplusplus);
4199 return fn;
4202 /* Like build_library_fn, but takes a C string instead of an
4203 IDENTIFIER_NODE. */
4205 tree
4206 build_library_fn_ptr (const char* name, tree type, int ecf_flags)
4208 return build_library_fn (get_identifier (name), ERROR_MARK, type, ecf_flags);
4211 /* Like build_cp_library_fn, but takes a C string instead of an
4212 IDENTIFIER_NODE. */
4214 tree
4215 build_cp_library_fn_ptr (const char* name, tree type, int ecf_flags)
4217 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type,
4218 ecf_flags);
4221 /* Like build_library_fn, but also pushes the function so that we will
4222 be able to find it via IDENTIFIER_GLOBAL_VALUE. Also, the function
4223 may throw exceptions listed in RAISES. */
4225 tree
4226 push_library_fn (tree name, tree type, tree raises, int ecf_flags)
4228 tree fn;
4230 if (raises)
4231 type = build_exception_variant (type, raises);
4233 fn = build_library_fn (name, ERROR_MARK, type, ecf_flags);
4234 pushdecl_top_level (fn);
4235 return fn;
4238 /* Like build_cp_library_fn, but also pushes the function so that it
4239 will be found by normal lookup. */
4241 static tree
4242 push_cp_library_fn (enum tree_code operator_code, tree type,
4243 int ecf_flags)
4245 tree fn = build_cp_library_fn (ansi_opname (operator_code),
4246 operator_code,
4247 type, ecf_flags);
4248 pushdecl (fn);
4249 if (flag_tm)
4250 apply_tm_attr (fn, get_identifier ("transaction_safe"));
4251 return fn;
4254 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
4255 a FUNCTION_TYPE. */
4257 tree
4258 push_void_library_fn (tree name, tree parmtypes, int ecf_flags)
4260 tree type = build_function_type (void_type_node, parmtypes);
4261 return push_library_fn (name, type, NULL_TREE, ecf_flags);
4264 /* Like push_library_fn, but also note that this function throws
4265 and does not return. Used for __throw_foo and the like. */
4267 tree
4268 push_throw_library_fn (tree name, tree type)
4270 tree fn = push_library_fn (name, type, NULL_TREE, ECF_NORETURN);
4271 return fn;
4274 /* When we call finish_struct for an anonymous union, we create
4275 default copy constructors and such. But, an anonymous union
4276 shouldn't have such things; this function undoes the damage to the
4277 anonymous union type T.
4279 (The reason that we create the synthesized methods is that we don't
4280 distinguish `union { int i; }' from `typedef union { int i; } U'.
4281 The first is an anonymous union; the second is just an ordinary
4282 union type.) */
4284 void
4285 fixup_anonymous_aggr (tree t)
4287 tree *q;
4289 /* Wipe out memory of synthesized methods. */
4290 TYPE_HAS_USER_CONSTRUCTOR (t) = 0;
4291 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
4292 TYPE_HAS_COPY_CTOR (t) = 0;
4293 TYPE_HAS_CONST_COPY_CTOR (t) = 0;
4294 TYPE_HAS_COPY_ASSIGN (t) = 0;
4295 TYPE_HAS_CONST_COPY_ASSIGN (t) = 0;
4297 /* Splice the implicitly generated functions out of the TYPE_METHODS
4298 list. */
4299 q = &TYPE_METHODS (t);
4300 while (*q)
4302 if (DECL_ARTIFICIAL (*q))
4303 *q = TREE_CHAIN (*q);
4304 else
4305 q = &DECL_CHAIN (*q);
4308 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
4309 if (TYPE_METHODS (t))
4311 tree decl = TYPE_MAIN_DECL (t);
4313 if (TREE_CODE (t) != UNION_TYPE)
4314 error_at (DECL_SOURCE_LOCATION (decl),
4315 "an anonymous struct cannot have function members");
4316 else
4317 error_at (DECL_SOURCE_LOCATION (decl),
4318 "an anonymous union cannot have function members");
4321 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
4322 assignment operators (because they cannot have these methods themselves).
4323 For anonymous unions this is already checked because they are not allowed
4324 in any union, otherwise we have to check it. */
4325 if (TREE_CODE (t) != UNION_TYPE)
4327 tree field, type;
4329 for (field = TYPE_FIELDS (t); field; field = DECL_CHAIN (field))
4330 if (TREE_CODE (field) == FIELD_DECL)
4332 type = TREE_TYPE (field);
4333 if (CLASS_TYPE_P (type))
4335 if (TYPE_NEEDS_CONSTRUCTING (type))
4336 error ("member %q+#D with constructor not allowed "
4337 "in anonymous aggregate", field);
4338 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
4339 error ("member %q+#D with destructor not allowed "
4340 "in anonymous aggregate", field);
4341 if (TYPE_HAS_COMPLEX_COPY_ASSIGN (type))
4342 error ("member %q+#D with copy assignment operator "
4343 "not allowed in anonymous aggregate", field);
4349 /* Warn for an attribute located at LOCATION that appertains to the
4350 class type CLASS_TYPE that has not been properly placed after its
4351 class-key, in it class-specifier. */
4353 void
4354 warn_misplaced_attr_for_class_type (source_location location,
4355 tree class_type)
4357 gcc_assert (OVERLOAD_TYPE_P (class_type));
4359 if (warning_at (location, OPT_Wattributes,
4360 "attribute ignored in declaration "
4361 "of %q#T", class_type))
4362 inform (location,
4363 "attribute for %q#T must follow the %qs keyword",
4364 class_type, class_key_or_enum_as_string (class_type));
4367 /* Make sure that a declaration with no declarator is well-formed, i.e.
4368 just declares a tagged type or anonymous union.
4370 Returns the type declared; or NULL_TREE if none. */
4372 tree
4373 check_tag_decl (cp_decl_specifier_seq *declspecs,
4374 bool explicit_type_instantiation_p)
4376 int saw_friend = decl_spec_seq_has_spec_p (declspecs, ds_friend);
4377 int saw_typedef = decl_spec_seq_has_spec_p (declspecs, ds_typedef);
4378 /* If a class, struct, or enum type is declared by the DECLSPECS
4379 (i.e, if a class-specifier, enum-specifier, or non-typename
4380 elaborated-type-specifier appears in the DECLSPECS),
4381 DECLARED_TYPE is set to the corresponding type. */
4382 tree declared_type = NULL_TREE;
4383 bool error_p = false;
4385 if (declspecs->multiple_types_p)
4386 error ("multiple types in one declaration");
4387 else if (declspecs->redefined_builtin_type)
4389 if (!in_system_header_at (input_location))
4390 permerror (declspecs->locations[ds_redefined_builtin_type_spec],
4391 "redeclaration of C++ built-in type %qT",
4392 declspecs->redefined_builtin_type);
4393 return NULL_TREE;
4396 if (declspecs->type
4397 && TYPE_P (declspecs->type)
4398 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
4399 && MAYBE_CLASS_TYPE_P (declspecs->type))
4400 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
4401 declared_type = declspecs->type;
4402 else if (declspecs->type == error_mark_node)
4403 error_p = true;
4404 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
4405 permerror (input_location, "declaration does not declare anything");
4406 else if (declared_type != NULL_TREE && type_uses_auto (declared_type))
4408 error ("%<auto%> can only be specified for variables "
4409 "or function declarations");
4410 return error_mark_node;
4412 /* Check for an anonymous union. */
4413 else if (declared_type && RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type))
4414 && TYPE_ANONYMOUS_P (declared_type))
4416 /* 7/3 In a simple-declaration, the optional init-declarator-list
4417 can be omitted only when declaring a class (clause 9) or
4418 enumeration (7.2), that is, when the decl-specifier-seq contains
4419 either a class-specifier, an elaborated-type-specifier with
4420 a class-key (9.1), or an enum-specifier. In these cases and
4421 whenever a class-specifier or enum-specifier is present in the
4422 decl-specifier-seq, the identifiers in these specifiers are among
4423 the names being declared by the declaration (as class-name,
4424 enum-names, or enumerators, depending on the syntax). In such
4425 cases, and except for the declaration of an unnamed bit-field (9.6),
4426 the decl-specifier-seq shall introduce one or more names into the
4427 program, or shall redeclare a name introduced by a previous
4428 declaration. [Example:
4429 enum { }; // ill-formed
4430 typedef class { }; // ill-formed
4431 --end example] */
4432 if (saw_typedef)
4434 error ("missing type-name in typedef-declaration");
4435 return NULL_TREE;
4437 /* Anonymous unions are objects, so they can have specifiers. */;
4438 SET_ANON_AGGR_TYPE_P (declared_type);
4440 if (TREE_CODE (declared_type) != UNION_TYPE
4441 && !in_system_header_at (input_location))
4442 pedwarn (input_location, OPT_Wpedantic, "ISO C++ prohibits anonymous structs");
4445 else
4447 if (decl_spec_seq_has_spec_p (declspecs, ds_inline)
4448 || decl_spec_seq_has_spec_p (declspecs, ds_virtual))
4449 error ("%qs can only be specified for functions",
4450 decl_spec_seq_has_spec_p (declspecs, ds_inline)
4451 ? "inline" : "virtual");
4452 else if (saw_friend
4453 && (!current_class_type
4454 || current_scope () != current_class_type))
4455 error ("%<friend%> can only be specified inside a class");
4456 else if (decl_spec_seq_has_spec_p (declspecs, ds_explicit))
4457 error ("%<explicit%> can only be specified for constructors");
4458 else if (declspecs->storage_class)
4459 error ("a storage class can only be specified for objects "
4460 "and functions");
4461 else if (decl_spec_seq_has_spec_p (declspecs, ds_const)
4462 || decl_spec_seq_has_spec_p (declspecs, ds_volatile)
4463 || decl_spec_seq_has_spec_p (declspecs, ds_restrict)
4464 || decl_spec_seq_has_spec_p (declspecs, ds_thread))
4465 error ("qualifiers can only be specified for objects "
4466 "and functions");
4467 else if (saw_typedef)
4468 warning (0, "%<typedef%> was ignored in this declaration");
4469 else if (decl_spec_seq_has_spec_p (declspecs, ds_constexpr))
4470 error ("%<constexpr%> cannot be used for type declarations");
4473 if (declspecs->attributes && warn_attributes && declared_type)
4475 location_t loc;
4476 if (!CLASS_TYPE_P (declared_type)
4477 || !CLASSTYPE_TEMPLATE_INSTANTIATION (declared_type))
4478 /* For a non-template class, use the name location. */
4479 loc = location_of (declared_type);
4480 else
4481 /* For a template class (an explicit instantiation), use the
4482 current location. */
4483 loc = input_location;
4485 if (explicit_type_instantiation_p)
4486 /* [dcl.attr.grammar]/4:
4488 No attribute-specifier-seq shall appertain to an explicit
4489 instantiation. */
4491 if (warning_at (loc, OPT_Wattributes,
4492 "attribute ignored in explicit instantiation %q#T",
4493 declared_type))
4494 inform (loc,
4495 "no attribute can be applied to "
4496 "an explicit instantiation");
4498 else
4499 warn_misplaced_attr_for_class_type (loc, declared_type);
4502 return declared_type;
4505 /* Called when a declaration is seen that contains no names to declare.
4506 If its type is a reference to a structure, union or enum inherited
4507 from a containing scope, shadow that tag name for the current scope
4508 with a forward reference.
4509 If its type defines a new named structure or union
4510 or defines an enum, it is valid but we need not do anything here.
4511 Otherwise, it is an error.
4513 C++: may have to grok the declspecs to learn about static,
4514 complain for anonymous unions.
4516 Returns the TYPE declared -- or NULL_TREE if none. */
4518 tree
4519 shadow_tag (cp_decl_specifier_seq *declspecs)
4521 tree t = check_tag_decl (declspecs,
4522 /*explicit_type_instantiation_p=*/false);
4524 if (!t)
4525 return NULL_TREE;
4527 if (maybe_process_partial_specialization (t) == error_mark_node)
4528 return NULL_TREE;
4530 /* This is where the variables in an anonymous union are
4531 declared. An anonymous union declaration looks like:
4532 union { ... } ;
4533 because there is no declarator after the union, the parser
4534 sends that declaration here. */
4535 if (ANON_AGGR_TYPE_P (t))
4537 fixup_anonymous_aggr (t);
4539 if (TYPE_FIELDS (t))
4541 tree decl = grokdeclarator (/*declarator=*/NULL,
4542 declspecs, NORMAL, 0, NULL);
4543 finish_anon_union (decl);
4547 return t;
4550 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4552 tree
4553 groktypename (cp_decl_specifier_seq *type_specifiers,
4554 const cp_declarator *declarator,
4555 bool is_template_arg)
4557 tree attrs;
4558 tree type;
4559 enum decl_context context
4560 = is_template_arg ? TEMPLATE_TYPE_ARG : TYPENAME;
4561 attrs = type_specifiers->attributes;
4562 type_specifiers->attributes = NULL_TREE;
4563 type = grokdeclarator (declarator, type_specifiers, context, 0, &attrs);
4564 if (attrs && type != error_mark_node)
4566 if (CLASS_TYPE_P (type))
4567 warning (OPT_Wattributes, "ignoring attributes applied to class type %qT "
4568 "outside of definition", type);
4569 else if (MAYBE_CLASS_TYPE_P (type))
4570 /* A template type parameter or other dependent type. */
4571 warning (OPT_Wattributes, "ignoring attributes applied to dependent "
4572 "type %qT without an associated declaration", type);
4573 else
4574 cplus_decl_attributes (&type, attrs, 0);
4576 return type;
4579 /* Process a DECLARATOR for a function-scope variable declaration,
4580 namespace-scope variable declaration, or function declaration.
4581 (Function definitions go through start_function; class member
4582 declarations appearing in the body of the class go through
4583 grokfield.) The DECL corresponding to the DECLARATOR is returned.
4584 If an error occurs, the error_mark_node is returned instead.
4586 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
4587 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
4588 for an explicitly defaulted function, or SD_DELETED for an explicitly
4589 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
4590 implicitly initialized via a default constructor. ATTRIBUTES and
4591 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
4593 The scope represented by the context of the returned DECL is pushed
4594 (if it is not the global namespace) and is assigned to
4595 *PUSHED_SCOPE_P. The caller is then responsible for calling
4596 pop_scope on *PUSHED_SCOPE_P if it is set. */
4598 tree
4599 start_decl (const cp_declarator *declarator,
4600 cp_decl_specifier_seq *declspecs,
4601 int initialized,
4602 tree attributes,
4603 tree prefix_attributes,
4604 tree *pushed_scope_p)
4606 tree decl;
4607 tree context;
4608 bool was_public;
4609 int flags;
4610 bool alias;
4612 *pushed_scope_p = NULL_TREE;
4614 /* An object declared as __attribute__((deprecated)) suppresses
4615 warnings of uses of other deprecated items. */
4616 if (lookup_attribute ("deprecated", attributes))
4617 deprecated_state = DEPRECATED_SUPPRESS;
4619 attributes = chainon (attributes, prefix_attributes);
4621 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
4622 &attributes);
4624 deprecated_state = DEPRECATED_NORMAL;
4626 if (decl == NULL_TREE || VOID_TYPE_P (decl)
4627 || decl == error_mark_node)
4628 return error_mark_node;
4630 context = CP_DECL_CONTEXT (decl);
4631 if (context != global_namespace)
4632 *pushed_scope_p = push_scope (context);
4634 if (initialized)
4635 /* Is it valid for this decl to have an initializer at all?
4636 If not, set INITIALIZED to zero, which will indirectly
4637 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4638 switch (TREE_CODE (decl))
4640 case TYPE_DECL:
4641 error ("typedef %qD is initialized (use decltype instead)", decl);
4642 return error_mark_node;
4644 case FUNCTION_DECL:
4645 if (initialized == SD_DELETED)
4646 /* We'll handle the rest of the semantics later, but we need to
4647 set this now so it's visible to duplicate_decls. */
4648 DECL_DELETED_FN (decl) = 1;
4649 break;
4651 default:
4652 break;
4655 if (initialized)
4657 if (! toplevel_bindings_p ()
4658 && DECL_EXTERNAL (decl))
4659 warning (0, "declaration of %q#D has %<extern%> and is initialized",
4660 decl);
4661 DECL_EXTERNAL (decl) = 0;
4662 if (toplevel_bindings_p ())
4663 TREE_STATIC (decl) = 1;
4665 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl)) != 0;
4667 if (alias && TREE_CODE (decl) == FUNCTION_DECL)
4668 record_key_method_defined (decl);
4670 /* If this is a typedef that names the class for linkage purposes
4671 (7.1.3p8), apply any attributes directly to the type. */
4672 if (TREE_CODE (decl) == TYPE_DECL
4673 && OVERLOAD_TYPE_P (TREE_TYPE (decl))
4674 && decl == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl))))
4675 flags = ATTR_FLAG_TYPE_IN_PLACE;
4676 else
4677 flags = 0;
4679 /* Set attributes here so if duplicate decl, will have proper attributes. */
4680 cplus_decl_attributes (&decl, attributes, flags);
4682 /* Dllimported symbols cannot be defined. Static data members (which
4683 can be initialized in-class and dllimported) go through grokfield,
4684 not here, so we don't need to exclude those decls when checking for
4685 a definition. */
4686 if (initialized && DECL_DLLIMPORT_P (decl))
4688 error ("definition of %q#D is marked %<dllimport%>", decl);
4689 DECL_DLLIMPORT_P (decl) = 0;
4692 /* If #pragma weak was used, mark the decl weak now. */
4693 if (!processing_template_decl)
4694 maybe_apply_pragma_weak (decl);
4696 if (TREE_CODE (decl) == FUNCTION_DECL
4697 && DECL_DECLARED_INLINE_P (decl)
4698 && DECL_UNINLINABLE (decl)
4699 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4700 warning (0, "inline function %q+D given attribute noinline", decl);
4702 if (TYPE_P (context) && COMPLETE_TYPE_P (complete_type (context)))
4704 bool this_tmpl = (processing_template_decl
4705 > template_class_depth (context));
4706 if (VAR_P (decl))
4708 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
4709 if (field == NULL_TREE
4710 || !(VAR_P (field) || variable_template_p (field)))
4711 error ("%q+#D is not a static data member of %q#T", decl, context);
4712 else if (variable_template_p (field) && !this_tmpl)
4714 if (DECL_LANG_SPECIFIC (decl)
4715 && DECL_TEMPLATE_SPECIALIZATION (decl))
4716 /* OK, specialization was already checked. */;
4717 else
4719 error_at (DECL_SOURCE_LOCATION (decl),
4720 "non-member-template declaration of %qD", decl);
4721 inform (DECL_SOURCE_LOCATION (field), "does not match "
4722 "member template declaration here");
4723 return error_mark_node;
4726 else
4728 if (variable_template_p (field))
4729 field = DECL_TEMPLATE_RESULT (field);
4731 if (DECL_CONTEXT (field) != context)
4733 if (!same_type_p (DECL_CONTEXT (field), context))
4734 permerror (input_location, "ISO C++ does not permit %<%T::%D%> "
4735 "to be defined as %<%T::%D%>",
4736 DECL_CONTEXT (field), DECL_NAME (decl),
4737 context, DECL_NAME (decl));
4738 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
4740 /* Static data member are tricky; an in-class initialization
4741 still doesn't provide a definition, so the in-class
4742 declaration will have DECL_EXTERNAL set, but will have an
4743 initialization. Thus, duplicate_decls won't warn
4744 about this situation, and so we check here. */
4745 if (initialized && DECL_INITIALIZED_IN_CLASS_P (field))
4746 error ("duplicate initialization of %qD", decl);
4747 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
4748 decl = field;
4749 if (decl_spec_seq_has_spec_p (declspecs, ds_constexpr)
4750 && !DECL_DECLARED_CONSTEXPR_P (field))
4751 error ("%qD declared %<constexpr%> outside its class", field);
4754 else
4756 tree field = check_classfn (context, decl,
4757 this_tmpl
4758 ? current_template_parms
4759 : NULL_TREE);
4760 if (field && field != error_mark_node
4761 && duplicate_decls (decl, field,
4762 /*newdecl_is_friend=*/false))
4763 decl = field;
4766 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
4767 DECL_IN_AGGR_P (decl) = 0;
4768 /* Do not mark DECL as an explicit specialization if it was not
4769 already marked as an instantiation; a declaration should
4770 never be marked as a specialization unless we know what
4771 template is being specialized. */
4772 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
4774 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
4775 if (TREE_CODE (decl) == FUNCTION_DECL)
4776 DECL_COMDAT (decl) = (TREE_PUBLIC (decl)
4777 && DECL_DECLARED_INLINE_P (decl));
4778 else
4779 DECL_COMDAT (decl) = false;
4781 /* [temp.expl.spec] An explicit specialization of a static data
4782 member of a template is a definition if the declaration
4783 includes an initializer; otherwise, it is a declaration.
4785 We check for processing_specialization so this only applies
4786 to the new specialization syntax. */
4787 if (!initialized && processing_specialization)
4788 DECL_EXTERNAL (decl) = 1;
4791 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl)
4792 /* Aliases are definitions. */
4793 && !alias)
4794 permerror (input_location, "declaration of %q#D outside of class is not definition",
4795 decl);
4798 was_public = TREE_PUBLIC (decl);
4800 /* Enter this declaration into the symbol table. */
4801 decl = maybe_push_decl (decl);
4803 if (processing_template_decl)
4804 decl = push_template_decl (decl);
4805 if (decl == error_mark_node)
4806 return error_mark_node;
4808 if (VAR_P (decl)
4809 && DECL_NAMESPACE_SCOPE_P (decl) && !TREE_PUBLIC (decl) && !was_public
4810 && !DECL_THIS_STATIC (decl) && !DECL_ARTIFICIAL (decl))
4812 /* This is a const variable with implicit 'static'. Set
4813 DECL_THIS_STATIC so we can tell it from variables that are
4814 !TREE_PUBLIC because of the anonymous namespace. */
4815 gcc_assert (CP_TYPE_CONST_P (TREE_TYPE (decl)) || errorcount);
4816 DECL_THIS_STATIC (decl) = 1;
4819 if (current_function_decl && VAR_P (decl)
4820 && DECL_DECLARED_CONSTEXPR_P (current_function_decl))
4822 bool ok = false;
4823 if (DECL_THREAD_LOCAL_P (decl))
4824 error ("%qD declared %<thread_local%> in %<constexpr%> function",
4825 decl);
4826 else if (TREE_STATIC (decl))
4827 error ("%qD declared %<static%> in %<constexpr%> function", decl);
4828 else
4829 ok = true;
4830 if (!ok)
4831 cp_function_chain->invalid_constexpr = true;
4834 if (!processing_template_decl && VAR_P (decl))
4835 start_decl_1 (decl, initialized);
4837 return decl;
4840 /* Process the declaration of a variable DECL. INITIALIZED is true
4841 iff DECL is explicitly initialized. (INITIALIZED is false if the
4842 variable is initialized via an implicitly-called constructor.)
4843 This function must be called for ordinary variables (including, for
4844 example, implicit instantiations of templates), but must not be
4845 called for template declarations. */
4847 void
4848 start_decl_1 (tree decl, bool initialized)
4850 tree type;
4851 bool complete_p;
4852 bool aggregate_definition_p;
4854 gcc_assert (!processing_template_decl);
4856 if (error_operand_p (decl))
4857 return;
4859 gcc_assert (VAR_P (decl));
4861 type = TREE_TYPE (decl);
4862 complete_p = COMPLETE_TYPE_P (type);
4863 aggregate_definition_p = MAYBE_CLASS_TYPE_P (type) && !DECL_EXTERNAL (decl);
4865 /* If an explicit initializer is present, or if this is a definition
4866 of an aggregate, then we need a complete type at this point.
4867 (Scalars are always complete types, so there is nothing to
4868 check.) This code just sets COMPLETE_P; errors (if necessary)
4869 are issued below. */
4870 if ((initialized || aggregate_definition_p)
4871 && !complete_p
4872 && COMPLETE_TYPE_P (complete_type (type)))
4874 complete_p = true;
4875 /* We will not yet have set TREE_READONLY on DECL if the type
4876 was "const", but incomplete, before this point. But, now, we
4877 have a complete type, so we can try again. */
4878 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
4881 if (initialized)
4882 /* Is it valid for this decl to have an initializer at all? */
4884 /* Don't allow initializations for incomplete types except for
4885 arrays which might be completed by the initialization. */
4886 if (complete_p)
4887 ; /* A complete type is ok. */
4888 else if (type_uses_auto (type))
4889 ; /* An auto type is ok. */
4890 else if (TREE_CODE (type) != ARRAY_TYPE)
4892 error ("variable %q#D has initializer but incomplete type", decl);
4893 type = TREE_TYPE (decl) = error_mark_node;
4895 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4897 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
4898 error ("elements of array %q#D have incomplete type", decl);
4899 /* else we already gave an error in start_decl. */
4902 else if (aggregate_definition_p && !complete_p)
4904 if (type_uses_auto (type))
4905 error ("declaration of %q#D has no initializer", decl);
4906 else
4907 error ("aggregate %q#D has incomplete type and cannot be defined",
4908 decl);
4909 /* Change the type so that assemble_variable will give
4910 DECL an rtl we can live with: (mem (const_int 0)). */
4911 type = TREE_TYPE (decl) = error_mark_node;
4914 /* Create a new scope to hold this declaration if necessary.
4915 Whether or not a new scope is necessary cannot be determined
4916 until after the type has been completed; if the type is a
4917 specialization of a class template it is not until after
4918 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
4919 will be set correctly. */
4920 maybe_push_cleanup_level (type);
4923 /* Handle initialization of references. DECL, TYPE, and INIT have the
4924 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
4925 but will be set to a new CLEANUP_STMT if a temporary is created
4926 that must be destroyed subsequently.
4928 Returns an initializer expression to use to initialize DECL, or
4929 NULL if the initialization can be performed statically.
4931 Quotes on semantics can be found in ARM 8.4.3. */
4933 static tree
4934 grok_reference_init (tree decl, tree type, tree init, int flags)
4936 if (init == NULL_TREE)
4938 if ((DECL_LANG_SPECIFIC (decl) == 0
4939 || DECL_IN_AGGR_P (decl) == 0)
4940 && ! DECL_THIS_EXTERN (decl))
4941 error ("%qD declared as reference but not initialized", decl);
4942 return NULL_TREE;
4945 if (TREE_CODE (init) == TREE_LIST)
4946 init = build_x_compound_expr_from_list (init, ELK_INIT,
4947 tf_warning_or_error);
4949 tree ttype = TREE_TYPE (type);
4950 if (TREE_CODE (ttype) != ARRAY_TYPE
4951 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
4952 /* Note: default conversion is only called in very special cases. */
4953 init = decay_conversion (init, tf_warning_or_error);
4955 /* check_initializer handles this for non-reference variables, but for
4956 references we need to do it here or the initializer will get the
4957 incomplete array type and confuse later calls to
4958 cp_complete_array_type. */
4959 if (TREE_CODE (ttype) == ARRAY_TYPE
4960 && TYPE_DOMAIN (ttype) == NULL_TREE
4961 && (BRACE_ENCLOSED_INITIALIZER_P (init)
4962 || TREE_CODE (init) == STRING_CST))
4964 cp_complete_array_type (&ttype, init, false);
4965 if (ttype != TREE_TYPE (type))
4966 type = cp_build_reference_type (ttype, TYPE_REF_IS_RVALUE (type));
4969 /* Convert INIT to the reference type TYPE. This may involve the
4970 creation of a temporary, whose lifetime must be the same as that
4971 of the reference. If so, a DECL_EXPR for the temporary will be
4972 added just after the DECL_EXPR for DECL. That's why we don't set
4973 DECL_INITIAL for local references (instead assigning to them
4974 explicitly); we need to allow the temporary to be initialized
4975 first. */
4976 return initialize_reference (type, init, flags,
4977 tf_warning_or_error);
4980 /* Designated initializers in arrays are not supported in GNU C++.
4981 The parser cannot detect this error since it does not know whether
4982 a given brace-enclosed initializer is for a class type or for an
4983 array. This function checks that CE does not use a designated
4984 initializer. If it does, an error is issued. Returns true if CE
4985 is valid, i.e., does not have a designated initializer. */
4987 static bool
4988 check_array_designated_initializer (constructor_elt *ce,
4989 unsigned HOST_WIDE_INT index)
4991 /* Designated initializers for array elements are not supported. */
4992 if (ce->index)
4994 /* The parser only allows identifiers as designated
4995 initializers. */
4996 if (ce->index == error_mark_node)
4998 error ("name used in a GNU-style designated "
4999 "initializer for an array");
5000 return false;
5002 else if (identifier_p (ce->index))
5004 error ("name %qD used in a GNU-style designated "
5005 "initializer for an array", ce->index);
5006 return false;
5009 tree ce_index = build_expr_type_conversion (WANT_INT | WANT_ENUM,
5010 ce->index, true);
5011 if (ce_index
5012 && INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (ce_index))
5013 && (TREE_CODE (ce_index = maybe_constant_value (ce_index))
5014 == INTEGER_CST))
5016 /* A C99 designator is OK if it matches the current index. */
5017 if (wi::eq_p (ce_index, index))
5018 return true;
5019 else
5020 sorry ("non-trivial designated initializers not supported");
5022 else
5023 error ("C99 designator %qE is not an integral constant-expression",
5024 ce->index);
5026 return false;
5029 return true;
5032 /* When parsing `int a[] = {1, 2};' we don't know the size of the
5033 array until we finish parsing the initializer. If that's the
5034 situation we're in, update DECL accordingly. */
5036 static void
5037 maybe_deduce_size_from_array_init (tree decl, tree init)
5039 tree type = TREE_TYPE (decl);
5041 if (TREE_CODE (type) == ARRAY_TYPE
5042 && TYPE_DOMAIN (type) == NULL_TREE
5043 && TREE_CODE (decl) != TYPE_DECL)
5045 /* do_default is really a C-ism to deal with tentative definitions.
5046 But let's leave it here to ease the eventual merge. */
5047 int do_default = !DECL_EXTERNAL (decl);
5048 tree initializer = init ? init : DECL_INITIAL (decl);
5049 int failure = 0;
5051 /* Check that there are no designated initializers in INIT, as
5052 those are not supported in GNU C++, and as the middle-end
5053 will crash if presented with a non-numeric designated
5054 initializer. */
5055 if (initializer && BRACE_ENCLOSED_INITIALIZER_P (initializer))
5057 vec<constructor_elt, va_gc> *v = CONSTRUCTOR_ELTS (initializer);
5058 constructor_elt *ce;
5059 HOST_WIDE_INT i;
5060 FOR_EACH_VEC_SAFE_ELT (v, i, ce)
5061 if (!check_array_designated_initializer (ce, i))
5062 failure = 1;
5065 if (!failure)
5067 failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
5068 do_default);
5069 if (failure == 1)
5071 error ("initializer fails to determine size of %qD", decl);
5073 else if (failure == 2)
5075 if (do_default)
5077 error ("array size missing in %qD", decl);
5079 /* If a `static' var's size isn't known, make it extern as
5080 well as static, so it does not get allocated. If it's not
5081 `static', then don't mark it extern; finish_incomplete_decl
5082 will give it a default size and it will get allocated. */
5083 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
5084 DECL_EXTERNAL (decl) = 1;
5086 else if (failure == 3)
5088 error ("zero-size array %qD", decl);
5092 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
5094 relayout_decl (decl);
5098 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
5099 any appropriate error messages regarding the layout. */
5101 static void
5102 layout_var_decl (tree decl)
5104 tree type;
5106 type = TREE_TYPE (decl);
5107 if (type == error_mark_node)
5108 return;
5110 /* If we haven't already laid out this declaration, do so now.
5111 Note that we must not call complete type for an external object
5112 because it's type might involve templates that we are not
5113 supposed to instantiate yet. (And it's perfectly valid to say
5114 `extern X x' for some incomplete type `X'.) */
5115 if (!DECL_EXTERNAL (decl))
5116 complete_type (type);
5117 if (!DECL_SIZE (decl)
5118 && TREE_TYPE (decl) != error_mark_node
5119 && (COMPLETE_TYPE_P (type)
5120 || (TREE_CODE (type) == ARRAY_TYPE
5121 && !TYPE_DOMAIN (type)
5122 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
5123 layout_decl (decl, 0);
5125 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
5127 /* An automatic variable with an incomplete type: that is an error.
5128 Don't talk about array types here, since we took care of that
5129 message in grokdeclarator. */
5130 error ("storage size of %qD isn%'t known", decl);
5131 TREE_TYPE (decl) = error_mark_node;
5133 #if 0
5134 /* Keep this code around in case we later want to control debug info
5135 based on whether a type is "used". (jason 1999-11-11) */
5137 else if (!DECL_EXTERNAL (decl) && MAYBE_CLASS_TYPE_P (ttype))
5138 /* Let debugger know it should output info for this type. */
5139 note_debug_info_needed (ttype);
5141 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
5142 note_debug_info_needed (DECL_CONTEXT (decl));
5143 #endif
5145 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
5146 && DECL_SIZE (decl) != NULL_TREE
5147 && ! TREE_CONSTANT (DECL_SIZE (decl)))
5149 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
5150 constant_expression_warning (DECL_SIZE (decl));
5151 else
5153 error ("storage size of %qD isn%'t constant", decl);
5154 TREE_TYPE (decl) = error_mark_node;
5159 /* If a local static variable is declared in an inline function, or if
5160 we have a weak definition, we must endeavor to create only one
5161 instance of the variable at link-time. */
5163 void
5164 maybe_commonize_var (tree decl)
5166 /* Static data in a function with comdat linkage also has comdat
5167 linkage. */
5168 if (TREE_STATIC (decl)
5169 /* Don't mess with __FUNCTION__. */
5170 && ! DECL_ARTIFICIAL (decl)
5171 && DECL_FUNCTION_SCOPE_P (decl)
5172 && vague_linkage_p (DECL_CONTEXT (decl)))
5174 if (flag_weak)
5176 /* With weak symbols, we simply make the variable COMDAT;
5177 that will cause copies in multiple translations units to
5178 be merged. */
5179 comdat_linkage (decl);
5181 else
5183 if (DECL_INITIAL (decl) == NULL_TREE
5184 || DECL_INITIAL (decl) == error_mark_node)
5186 /* Without weak symbols, we can use COMMON to merge
5187 uninitialized variables. */
5188 TREE_PUBLIC (decl) = 1;
5189 DECL_COMMON (decl) = 1;
5191 else
5193 /* While for initialized variables, we must use internal
5194 linkage -- which means that multiple copies will not
5195 be merged. */
5196 TREE_PUBLIC (decl) = 0;
5197 DECL_COMMON (decl) = 0;
5198 if (warning_at (DECL_SOURCE_LOCATION (decl), 0,
5199 "sorry: semantics of inline function static "
5200 "data %q#D are wrong (you%'ll wind up "
5201 "with multiple copies)", decl))
5202 inform (DECL_SOURCE_LOCATION (decl),
5203 "you can work around this by removing the initializer");
5209 /* Issue an error message if DECL is an uninitialized const variable. */
5211 static void
5212 check_for_uninitialized_const_var (tree decl)
5214 tree type = strip_array_types (TREE_TYPE (decl));
5216 /* ``Unless explicitly declared extern, a const object does not have
5217 external linkage and must be initialized. ($8.4; $12.1)'' ARM
5218 7.1.6 */
5219 if (VAR_P (decl)
5220 && TREE_CODE (type) != REFERENCE_TYPE
5221 && (CP_TYPE_CONST_P (type) || var_in_constexpr_fn (decl))
5222 && !DECL_INITIAL (decl))
5224 tree field = default_init_uninitialized_part (type);
5225 if (!field)
5226 return;
5228 if (CP_TYPE_CONST_P (type))
5229 permerror (DECL_SOURCE_LOCATION (decl),
5230 "uninitialized const %qD", decl);
5231 else
5233 error_at (DECL_SOURCE_LOCATION (decl),
5234 "uninitialized variable %qD in %<constexpr%> function",
5235 decl);
5236 cp_function_chain->invalid_constexpr = true;
5239 if (CLASS_TYPE_P (type))
5241 tree defaulted_ctor;
5243 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (type)),
5244 "%q#T has no user-provided default constructor", type);
5245 defaulted_ctor = in_class_defaulted_default_constructor (type);
5246 if (defaulted_ctor)
5247 inform (DECL_SOURCE_LOCATION (defaulted_ctor),
5248 "constructor is not user-provided because it is "
5249 "explicitly defaulted in the class body");
5250 inform (0, "and the implicitly-defined constructor does not "
5251 "initialize %q+#D", field);
5256 /* Structure holding the current initializer being processed by reshape_init.
5257 CUR is a pointer to the current element being processed, END is a pointer
5258 after the last element present in the initializer. */
5259 typedef struct reshape_iterator_t
5261 constructor_elt *cur;
5262 constructor_elt *end;
5263 } reshape_iter;
5265 static tree reshape_init_r (tree, reshape_iter *, bool, tsubst_flags_t);
5267 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
5268 returned is the next FIELD_DECL (possibly FIELD itself) that can be
5269 initialized. If there are no more such fields, the return value
5270 will be NULL. */
5272 tree
5273 next_initializable_field (tree field)
5275 while (field
5276 && (TREE_CODE (field) != FIELD_DECL
5277 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
5278 || DECL_ARTIFICIAL (field)))
5279 field = DECL_CHAIN (field);
5281 return field;
5284 /* Subroutine of reshape_init_array and reshape_init_vector, which does
5285 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
5286 INTEGER_CST representing the size of the array minus one (the maximum index),
5287 or NULL_TREE if the array was declared without specifying the size. D is
5288 the iterator within the constructor. */
5290 static tree
5291 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d,
5292 tsubst_flags_t complain)
5294 tree new_init;
5295 bool sized_array_p = (max_index && TREE_CONSTANT (max_index));
5296 unsigned HOST_WIDE_INT max_index_cst = 0;
5297 unsigned HOST_WIDE_INT index;
5299 /* The initializer for an array is always a CONSTRUCTOR. */
5300 new_init = build_constructor (init_list_type_node, NULL);
5302 if (sized_array_p)
5304 /* Minus 1 is used for zero sized arrays. */
5305 if (integer_all_onesp (max_index))
5306 return new_init;
5308 if (tree_fits_uhwi_p (max_index))
5309 max_index_cst = tree_to_uhwi (max_index);
5310 /* sizetype is sign extended, not zero extended. */
5311 else
5312 max_index_cst = tree_to_uhwi (fold_convert (size_type_node, max_index));
5315 /* Loop until there are no more initializers. */
5316 for (index = 0;
5317 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
5318 ++index)
5320 tree elt_init;
5321 constructor_elt *old_cur = d->cur;
5323 check_array_designated_initializer (d->cur, index);
5324 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false,
5325 complain);
5326 if (elt_init == error_mark_node)
5327 return error_mark_node;
5328 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init),
5329 size_int (index), elt_init);
5330 if (!TREE_CONSTANT (elt_init))
5331 TREE_CONSTANT (new_init) = false;
5333 /* This can happen with an invalid initializer (c++/54501). */
5334 if (d->cur == old_cur && !sized_array_p)
5335 break;
5338 return new_init;
5341 /* Subroutine of reshape_init_r, processes the initializers for arrays.
5342 Parameters are the same of reshape_init_r. */
5344 static tree
5345 reshape_init_array (tree type, reshape_iter *d, tsubst_flags_t complain)
5347 tree max_index = NULL_TREE;
5349 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
5351 if (TYPE_DOMAIN (type))
5352 max_index = array_type_nelts (type);
5354 return reshape_init_array_1 (TREE_TYPE (type), max_index, d, complain);
5357 /* Subroutine of reshape_init_r, processes the initializers for vectors.
5358 Parameters are the same of reshape_init_r. */
5360 static tree
5361 reshape_init_vector (tree type, reshape_iter *d, tsubst_flags_t complain)
5363 tree max_index = NULL_TREE;
5365 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
5367 if (COMPOUND_LITERAL_P (d->cur->value))
5369 tree value = d->cur->value;
5370 if (!same_type_p (TREE_TYPE (value), type))
5372 if (complain & tf_error)
5373 error ("invalid type %qT as initializer for a vector of type %qT",
5374 TREE_TYPE (d->cur->value), type);
5375 value = error_mark_node;
5377 ++d->cur;
5378 return value;
5381 /* For a vector, we initialize it as an array of the appropriate size. */
5382 if (TREE_CODE (type) == VECTOR_TYPE)
5383 max_index = size_int (TYPE_VECTOR_SUBPARTS (type) - 1);
5385 return reshape_init_array_1 (TREE_TYPE (type), max_index, d, complain);
5388 /* Subroutine of reshape_init_r, processes the initializers for classes
5389 or union. Parameters are the same of reshape_init_r. */
5391 static tree
5392 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p,
5393 tsubst_flags_t complain)
5395 tree field;
5396 tree new_init;
5398 gcc_assert (CLASS_TYPE_P (type));
5400 /* The initializer for a class is always a CONSTRUCTOR. */
5401 new_init = build_constructor (init_list_type_node, NULL);
5402 field = next_initializable_field (TYPE_FIELDS (type));
5404 if (!field)
5406 /* [dcl.init.aggr]
5408 An initializer for an aggregate member that is an
5409 empty class shall have the form of an empty
5410 initializer-list {}. */
5411 if (!first_initializer_p)
5413 if (complain & tf_error)
5414 error ("initializer for %qT must be brace-enclosed", type);
5415 return error_mark_node;
5417 return new_init;
5420 /* Loop through the initializable fields, gathering initializers. */
5421 while (d->cur != d->end)
5423 tree field_init;
5424 constructor_elt *old_cur = d->cur;
5426 /* Handle designated initializers, as an extension. */
5427 if (d->cur->index)
5429 if (d->cur->index == error_mark_node)
5430 return error_mark_node;
5432 if (TREE_CODE (d->cur->index) == FIELD_DECL)
5433 /* We already reshaped this. */
5434 gcc_assert (d->cur->index == field);
5435 else if (TREE_CODE (d->cur->index) == IDENTIFIER_NODE)
5436 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
5437 else
5439 if (complain & tf_error)
5440 error ("%<[%E] =%> used in a GNU-style designated initializer"
5441 " for class %qT", d->cur->index, type);
5442 return error_mark_node;
5445 if (!field || TREE_CODE (field) != FIELD_DECL)
5447 if (complain & tf_error)
5448 error ("%qT has no non-static data member named %qD", type,
5449 d->cur->index);
5450 return error_mark_node;
5454 /* If we processed all the member of the class, we are done. */
5455 if (!field)
5456 break;
5458 field_init = reshape_init_r (TREE_TYPE (field), d,
5459 /*first_initializer_p=*/false, complain);
5460 if (field_init == error_mark_node)
5461 return error_mark_node;
5463 if (d->cur == old_cur && d->cur->index)
5465 /* This can happen with an invalid initializer for a flexible
5466 array member (c++/54441). */
5467 if (complain & tf_error)
5468 error ("invalid initializer for %q#D", field);
5469 return error_mark_node;
5472 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
5474 /* [dcl.init.aggr]
5476 When a union is initialized with a brace-enclosed
5477 initializer, the braces shall only contain an
5478 initializer for the first member of the union. */
5479 if (TREE_CODE (type) == UNION_TYPE)
5480 break;
5482 field = next_initializable_field (DECL_CHAIN (field));
5485 return new_init;
5488 /* Subroutine of reshape_init_r. We're in a context where C99 initializer
5489 designators are not valid; either complain or return true to indicate
5490 that reshape_init_r should return error_mark_node. */
5492 static bool
5493 has_designator_problem (reshape_iter *d, tsubst_flags_t complain)
5495 if (d->cur->index)
5497 if (complain & tf_error)
5498 error ("C99 designator %qE outside aggregate initializer",
5499 d->cur->index);
5500 else
5501 return true;
5503 return false;
5506 /* Subroutine of reshape_init, which processes a single initializer (part of
5507 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
5508 iterator within the CONSTRUCTOR which points to the initializer to process.
5509 FIRST_INITIALIZER_P is true if this is the first initializer of the
5510 outermost CONSTRUCTOR node. */
5512 static tree
5513 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p,
5514 tsubst_flags_t complain)
5516 tree init = d->cur->value;
5518 if (error_operand_p (init))
5519 return error_mark_node;
5521 if (first_initializer_p && !CP_AGGREGATE_TYPE_P (type)
5522 && has_designator_problem (d, complain))
5523 return error_mark_node;
5525 if (TREE_CODE (type) == COMPLEX_TYPE)
5527 /* A complex type can be initialized from one or two initializers,
5528 but braces are not elided. */
5529 d->cur++;
5530 if (BRACE_ENCLOSED_INITIALIZER_P (init))
5532 if (CONSTRUCTOR_NELTS (init) > 2)
5534 if (complain & tf_error)
5535 error ("too many initializers for %qT", type);
5536 else
5537 return error_mark_node;
5540 else if (first_initializer_p && d->cur != d->end)
5542 vec<constructor_elt, va_gc> *v = 0;
5543 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, init);
5544 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, d->cur->value);
5545 if (has_designator_problem (d, complain))
5546 return error_mark_node;
5547 d->cur++;
5548 init = build_constructor (init_list_type_node, v);
5550 return init;
5553 /* A non-aggregate type is always initialized with a single
5554 initializer. */
5555 if (!CP_AGGREGATE_TYPE_P (type))
5557 /* It is invalid to initialize a non-aggregate type with a
5558 brace-enclosed initializer before C++0x.
5559 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
5560 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
5561 a CONSTRUCTOR (with a record type). */
5562 if (TREE_CODE (init) == CONSTRUCTOR
5563 /* Don't complain about a capture-init. */
5564 && !CONSTRUCTOR_IS_DIRECT_INIT (init)
5565 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
5567 if (SCALAR_TYPE_P (type))
5569 if (cxx_dialect < cxx11
5570 /* Isn't value-initialization. */
5571 || CONSTRUCTOR_NELTS (init) > 0)
5573 if (complain & tf_error)
5574 error ("braces around scalar initializer for type %qT",
5575 type);
5576 init = error_mark_node;
5579 else
5580 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5583 d->cur++;
5584 return init;
5587 /* "If T is a class type and the initializer list has a single element of
5588 type cv U, where U is T or a class derived from T, the object is
5589 initialized from that element." Even if T is an aggregate. */
5590 if (cxx_dialect >= cxx11 && (CLASS_TYPE_P (type) || VECTOR_TYPE_P (type))
5591 && first_initializer_p
5592 && d->end - d->cur == 1
5593 && reference_related_p (type, TREE_TYPE (init)))
5595 d->cur++;
5596 return init;
5599 /* [dcl.init.aggr]
5601 All implicit type conversions (clause _conv_) are considered when
5602 initializing the aggregate member with an initializer from an
5603 initializer-list. If the initializer can initialize a member,
5604 the member is initialized. Otherwise, if the member is itself a
5605 non-empty subaggregate, brace elision is assumed and the
5606 initializer is considered for the initialization of the first
5607 member of the subaggregate. */
5608 if (TREE_CODE (init) != CONSTRUCTOR
5609 /* But don't try this for the first initializer, since that would be
5610 looking through the outermost braces; A a2 = { a1 }; is not a
5611 valid aggregate initialization. */
5612 && !first_initializer_p
5613 && (same_type_ignoring_top_level_qualifiers_p (type, TREE_TYPE (init))
5614 || can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL,
5615 complain)))
5617 d->cur++;
5618 return init;
5621 /* [dcl.init.string]
5623 A char array (whether plain char, signed char, or unsigned char)
5624 can be initialized by a string-literal (optionally enclosed in
5625 braces); a wchar_t array can be initialized by a wide
5626 string-literal (optionally enclosed in braces). */
5627 if (TREE_CODE (type) == ARRAY_TYPE
5628 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
5630 tree str_init = init;
5632 /* Strip one level of braces if and only if they enclose a single
5633 element (as allowed by [dcl.init.string]). */
5634 if (!first_initializer_p
5635 && TREE_CODE (str_init) == CONSTRUCTOR
5636 && vec_safe_length (CONSTRUCTOR_ELTS (str_init)) == 1)
5638 str_init = (*CONSTRUCTOR_ELTS (str_init))[0].value;
5641 /* If it's a string literal, then it's the initializer for the array
5642 as a whole. Otherwise, continue with normal initialization for
5643 array types (one value per array element). */
5644 if (TREE_CODE (str_init) == STRING_CST)
5646 if (has_designator_problem (d, complain))
5647 return error_mark_node;
5648 d->cur++;
5649 return str_init;
5653 /* The following cases are about aggregates. If we are not within a full
5654 initializer already, and there is not a CONSTRUCTOR, it means that there
5655 is a missing set of braces (that is, we are processing the case for
5656 which reshape_init exists). */
5657 if (!first_initializer_p)
5659 if (TREE_CODE (init) == CONSTRUCTOR)
5661 if (TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init)))
5662 /* There is no need to reshape pointer-to-member function
5663 initializers, as they are always constructed correctly
5664 by the front end. */
5666 else if (COMPOUND_LITERAL_P (init))
5667 /* For a nested compound literal, there is no need to reshape since
5668 brace elision is not allowed. Even if we decided to allow it,
5669 we should add a call to reshape_init in finish_compound_literal,
5670 before calling digest_init, so changing this code would still
5671 not be necessary. */
5672 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
5673 else
5675 ++d->cur;
5676 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5677 return reshape_init (type, init, complain);
5681 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
5682 type);
5685 /* Dispatch to specialized routines. */
5686 if (CLASS_TYPE_P (type))
5687 return reshape_init_class (type, d, first_initializer_p, complain);
5688 else if (TREE_CODE (type) == ARRAY_TYPE)
5689 return reshape_init_array (type, d, complain);
5690 else if (TREE_CODE (type) == VECTOR_TYPE)
5691 return reshape_init_vector (type, d, complain);
5692 else
5693 gcc_unreachable();
5696 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
5697 brace-enclosed aggregate initializer.
5699 INIT is the CONSTRUCTOR containing the list of initializers describing
5700 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
5701 It may not presently match the shape of the TYPE; for example:
5703 struct S { int a; int b; };
5704 struct S a[] = { 1, 2, 3, 4 };
5706 Here INIT will hold a vector of four elements, rather than a
5707 vector of two elements, each itself a vector of two elements. This
5708 routine transforms INIT from the former form into the latter. The
5709 revised CONSTRUCTOR node is returned. */
5711 tree
5712 reshape_init (tree type, tree init, tsubst_flags_t complain)
5714 vec<constructor_elt, va_gc> *v;
5715 reshape_iter d;
5716 tree new_init;
5718 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5720 v = CONSTRUCTOR_ELTS (init);
5722 /* An empty constructor does not need reshaping, and it is always a valid
5723 initializer. */
5724 if (vec_safe_is_empty (v))
5725 return init;
5727 /* Recurse on this CONSTRUCTOR. */
5728 d.cur = &(*v)[0];
5729 d.end = d.cur + v->length ();
5731 new_init = reshape_init_r (type, &d, true, complain);
5732 if (new_init == error_mark_node)
5733 return error_mark_node;
5735 /* Make sure all the element of the constructor were used. Otherwise,
5736 issue an error about exceeding initializers. */
5737 if (d.cur != d.end)
5739 if (complain & tf_error)
5740 error ("too many initializers for %qT", type);
5741 else
5742 return error_mark_node;
5745 return new_init;
5748 /* Verify array initializer. Returns true if errors have been reported. */
5750 bool
5751 check_array_initializer (tree decl, tree type, tree init)
5753 tree element_type = TREE_TYPE (type);
5755 /* The array type itself need not be complete, because the
5756 initializer may tell us how many elements are in the array.
5757 But, the elements of the array must be complete. */
5758 if (!COMPLETE_TYPE_P (complete_type (element_type)))
5760 if (decl)
5761 error ("elements of array %q#D have incomplete type", decl);
5762 else
5763 error ("elements of array %q#T have incomplete type", type);
5764 return true;
5766 /* A compound literal can't have variable size. */
5767 if (init && !decl
5768 && ((COMPLETE_TYPE_P (type) && !TREE_CONSTANT (TYPE_SIZE (type)))
5769 || !TREE_CONSTANT (TYPE_SIZE (element_type))))
5771 error ("variable-sized compound literal");
5772 return true;
5774 return false;
5777 /* Subroutine of check_initializer; args are passed down from that function.
5778 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
5780 static tree
5781 build_aggr_init_full_exprs (tree decl, tree init, int flags)
5784 gcc_assert (stmts_are_full_exprs_p ());
5785 return build_aggr_init (decl, init, flags, tf_warning_or_error);
5788 /* Verify INIT (the initializer for DECL), and record the
5789 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
5790 grok_reference_init.
5792 If the return value is non-NULL, it is an expression that must be
5793 evaluated dynamically to initialize DECL. */
5795 static tree
5796 check_initializer (tree decl, tree init, int flags, vec<tree, va_gc> **cleanups)
5798 tree type = TREE_TYPE (decl);
5799 tree init_code = NULL;
5800 tree core_type;
5802 /* Things that are going to be initialized need to have complete
5803 type. */
5804 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
5806 if (DECL_HAS_VALUE_EXPR_P (decl))
5808 /* A variable with DECL_HAS_VALUE_EXPR_P set is just a placeholder,
5809 it doesn't have storage to be initialized. */
5810 gcc_assert (init == NULL_TREE);
5811 return NULL_TREE;
5814 if (type == error_mark_node)
5815 /* We will have already complained. */
5816 return NULL_TREE;
5818 if (TREE_CODE (type) == ARRAY_TYPE)
5820 if (check_array_initializer (decl, type, init))
5821 return NULL_TREE;
5823 else if (!COMPLETE_TYPE_P (type))
5825 error ("%q#D has incomplete type", decl);
5826 TREE_TYPE (decl) = error_mark_node;
5827 return NULL_TREE;
5829 else
5830 /* There is no way to make a variable-sized class type in GNU C++. */
5831 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
5833 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5835 int init_len = vec_safe_length (CONSTRUCTOR_ELTS (init));
5836 if (SCALAR_TYPE_P (type))
5838 if (init_len == 0)
5840 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5841 init = build_zero_init (type, NULL_TREE, false);
5843 else if (init_len != 1 && TREE_CODE (type) != COMPLEX_TYPE)
5845 error ("scalar object %qD requires one element in initializer",
5846 decl);
5847 TREE_TYPE (decl) = error_mark_node;
5848 return NULL_TREE;
5853 if (TREE_CODE (decl) == CONST_DECL)
5855 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
5857 DECL_INITIAL (decl) = init;
5859 gcc_assert (init != NULL_TREE);
5860 init = NULL_TREE;
5862 else if (!init && DECL_REALLY_EXTERN (decl))
5864 else if (init || type_build_ctor_call (type)
5865 || TREE_CODE (type) == REFERENCE_TYPE)
5867 if (TREE_CODE (type) == REFERENCE_TYPE)
5869 init = grok_reference_init (decl, type, init, flags);
5870 flags |= LOOKUP_ALREADY_DIGESTED;
5872 else if (!init)
5873 check_for_uninitialized_const_var (decl);
5874 /* Do not reshape constructors of vectors (they don't need to be
5875 reshaped. */
5876 else if (BRACE_ENCLOSED_INITIALIZER_P (init))
5878 if (is_std_init_list (type))
5880 init = perform_implicit_conversion (type, init,
5881 tf_warning_or_error);
5882 flags |= LOOKUP_ALREADY_DIGESTED;
5884 else if (TYPE_NON_AGGREGATE_CLASS (type))
5886 /* Don't reshape if the class has constructors. */
5887 if (cxx_dialect == cxx98)
5888 error ("in C++98 %qD must be initialized by constructor, "
5889 "not by %<{...}%>",
5890 decl);
5892 else if (TREE_CODE (type) == VECTOR_TYPE && TYPE_VECTOR_OPAQUE (type))
5894 error ("opaque vector types cannot be initialized");
5895 init = error_mark_node;
5897 else
5899 init = reshape_init (type, init, tf_warning_or_error);
5900 flags |= LOOKUP_NO_NARROWING;
5903 else if (TREE_CODE (init) == TREE_LIST
5904 && TREE_TYPE (init) != unknown_type_node
5905 && !MAYBE_CLASS_TYPE_P (type))
5907 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
5909 /* We get here with code like `int a (2);' */
5910 init = build_x_compound_expr_from_list (init, ELK_INIT,
5911 tf_warning_or_error);
5914 /* If DECL has an array type without a specific bound, deduce the
5915 array size from the initializer. */
5916 maybe_deduce_size_from_array_init (decl, init);
5917 type = TREE_TYPE (decl);
5918 if (type == error_mark_node)
5919 return NULL_TREE;
5921 if ((type_build_ctor_call (type) || CLASS_TYPE_P (type))
5922 && !(flags & LOOKUP_ALREADY_DIGESTED)
5923 && !(init && BRACE_ENCLOSED_INITIALIZER_P (init)
5924 && CP_AGGREGATE_TYPE_P (type)
5925 && (CLASS_TYPE_P (type)
5926 || !TYPE_NEEDS_CONSTRUCTING (type)
5927 || type_has_extended_temps (type))))
5929 init_code = build_aggr_init_full_exprs (decl, init, flags);
5931 /* A constructor call is a non-trivial initializer even if
5932 it isn't explicitly written. */
5933 if (TREE_SIDE_EFFECTS (init_code))
5934 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = true;
5936 /* If this is a constexpr initializer, expand_default_init will
5937 have returned an INIT_EXPR rather than a CALL_EXPR. In that
5938 case, pull the initializer back out and pass it down into
5939 store_init_value. */
5940 while (TREE_CODE (init_code) == EXPR_STMT
5941 || TREE_CODE (init_code) == CONVERT_EXPR)
5942 init_code = TREE_OPERAND (init_code, 0);
5943 if (TREE_CODE (init_code) == INIT_EXPR)
5945 init = TREE_OPERAND (init_code, 1);
5946 init_code = NULL_TREE;
5947 /* Don't call digest_init; it's unnecessary and will complain
5948 about aggregate initialization of non-aggregate classes. */
5949 flags |= LOOKUP_ALREADY_DIGESTED;
5951 else if (DECL_DECLARED_CONSTEXPR_P (decl))
5953 /* Declared constexpr, but no suitable initializer; massage
5954 init appropriately so we can pass it into store_init_value
5955 for the error. */
5956 if (CLASS_TYPE_P (type)
5957 && (!init || TREE_CODE (init) == TREE_LIST))
5959 init = build_functional_cast (type, init, tf_none);
5960 if (TREE_CODE (init) == TARGET_EXPR)
5961 TARGET_EXPR_DIRECT_INIT_P (init) = true;
5963 init_code = NULL_TREE;
5965 else
5966 init = NULL_TREE;
5969 if (init && TREE_CODE (init) != TREE_VEC)
5971 /* In aggregate initialization of a variable, each element
5972 initialization is a full-expression because there is no
5973 enclosing expression. */
5974 gcc_assert (stmts_are_full_exprs_p ());
5976 init_code = store_init_value (decl, init, cleanups, flags);
5978 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
5979 && DECL_INITIAL (decl)
5980 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
5981 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
5982 warning (0, "array %qD initialized by parenthesized string literal %qE",
5983 decl, DECL_INITIAL (decl));
5984 init = NULL;
5987 else
5989 if (CLASS_TYPE_P (core_type = strip_array_types (type))
5990 && (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type)
5991 || CLASSTYPE_REF_FIELDS_NEED_INIT (core_type)))
5992 diagnose_uninitialized_cst_or_ref_member (core_type, /*using_new=*/false,
5993 /*complain=*/true);
5995 check_for_uninitialized_const_var (decl);
5998 if (init && init != error_mark_node)
5999 init_code = build2 (INIT_EXPR, type, decl, init);
6001 if (init_code)
6003 /* We might have set these in cp_finish_decl. */
6004 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = false;
6005 TREE_CONSTANT (decl) = false;
6008 if (init_code && DECL_IN_AGGR_P (decl))
6010 static int explained = 0;
6012 if (cxx_dialect < cxx11)
6013 error ("initializer invalid for static member with constructor");
6014 else
6015 error ("non-constant in-class initialization invalid for static "
6016 "member %qD", decl);
6017 if (!explained)
6019 inform (input_location,
6020 "(an out of class initialization is required)");
6021 explained = 1;
6023 return NULL_TREE;
6026 return init_code;
6029 /* If DECL is not a local variable, give it RTL. */
6031 static void
6032 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
6034 int toplev = toplevel_bindings_p ();
6035 int defer_p;
6036 const char *filename;
6038 /* Set the DECL_ASSEMBLER_NAME for the object. */
6039 if (asmspec)
6041 /* The `register' keyword, when used together with an
6042 asm-specification, indicates that the variable should be
6043 placed in a particular register. */
6044 if (VAR_P (decl) && DECL_REGISTER (decl))
6046 set_user_assembler_name (decl, asmspec);
6047 DECL_HARD_REGISTER (decl) = 1;
6049 else
6051 if (TREE_CODE (decl) == FUNCTION_DECL
6052 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
6053 set_builtin_user_assembler_name (decl, asmspec);
6054 set_user_assembler_name (decl, asmspec);
6058 /* Handle non-variables up front. */
6059 if (!VAR_P (decl))
6061 rest_of_decl_compilation (decl, toplev, at_eof);
6062 return;
6065 /* If we see a class member here, it should be a static data
6066 member. */
6067 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
6069 gcc_assert (TREE_STATIC (decl));
6070 /* An in-class declaration of a static data member should be
6071 external; it is only a declaration, and not a definition. */
6072 if (init == NULL_TREE)
6073 gcc_assert (DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl));
6076 /* We don't create any RTL for local variables. */
6077 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
6078 return;
6080 /* We defer emission of local statics until the corresponding
6081 DECL_EXPR is expanded. */
6082 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
6084 /* We try to defer namespace-scope static constants so that they are
6085 not emitted into the object file unnecessarily. */
6086 filename = LOCATION_FILE (input_location);
6087 if (!DECL_VIRTUAL_P (decl)
6088 && TREE_READONLY (decl)
6089 && DECL_INITIAL (decl) != NULL_TREE
6090 && DECL_INITIAL (decl) != error_mark_node
6091 && filename != NULL
6092 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
6093 && toplev
6094 && !TREE_PUBLIC (decl))
6096 /* Fool with the linkage of static consts according to #pragma
6097 interface. */
6098 struct c_fileinfo *finfo = get_fileinfo (filename);
6099 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
6101 TREE_PUBLIC (decl) = 1;
6102 DECL_EXTERNAL (decl) = finfo->interface_only;
6105 defer_p = 1;
6107 /* Likewise for template instantiations. */
6108 else if (DECL_LANG_SPECIFIC (decl)
6109 && DECL_IMPLICIT_INSTANTIATION (decl))
6110 defer_p = 1;
6112 /* If we're not deferring, go ahead and assemble the variable. */
6113 if (!defer_p)
6114 rest_of_decl_compilation (decl, toplev, at_eof);
6117 /* walk_tree helper for wrap_temporary_cleanups, below. */
6119 static tree
6120 wrap_cleanups_r (tree *stmt_p, int *walk_subtrees, void *data)
6122 /* Stop at types or full-expression boundaries. */
6123 if (TYPE_P (*stmt_p)
6124 || TREE_CODE (*stmt_p) == CLEANUP_POINT_EXPR)
6126 *walk_subtrees = 0;
6127 return NULL_TREE;
6130 if (TREE_CODE (*stmt_p) == TARGET_EXPR)
6132 tree guard = (tree)data;
6133 tree tcleanup = TARGET_EXPR_CLEANUP (*stmt_p);
6135 tcleanup = build2 (TRY_CATCH_EXPR, void_type_node, tcleanup, guard);
6136 /* Tell honor_protect_cleanup_actions to handle this as a separate
6137 cleanup. */
6138 TRY_CATCH_IS_CLEANUP (tcleanup) = 1;
6140 TARGET_EXPR_CLEANUP (*stmt_p) = tcleanup;
6143 return NULL_TREE;
6146 /* We're initializing a local variable which has a cleanup GUARD. If there
6147 are any temporaries used in the initializer INIT of this variable, we
6148 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
6149 variable will be cleaned up properly if one of them throws.
6151 Unfortunately, there's no way to express this properly in terms of
6152 nesting, as the regions for the temporaries overlap the region for the
6153 variable itself; if there are two temporaries, the variable needs to be
6154 the first thing destroyed if either of them throws. However, we only
6155 want to run the variable's cleanup if it actually got constructed. So
6156 we need to guard the temporary cleanups with the variable's cleanup if
6157 they are run on the normal path, but not if they are run on the
6158 exceptional path. We implement this by telling
6159 honor_protect_cleanup_actions to strip the variable cleanup from the
6160 exceptional path. */
6162 static void
6163 wrap_temporary_cleanups (tree init, tree guard)
6165 cp_walk_tree_without_duplicates (&init, wrap_cleanups_r, (void *)guard);
6168 /* Generate code to initialize DECL (a local variable). */
6170 static void
6171 initialize_local_var (tree decl, tree init)
6173 tree type = TREE_TYPE (decl);
6174 tree cleanup;
6175 int already_used;
6177 gcc_assert (VAR_P (decl)
6178 || TREE_CODE (decl) == RESULT_DECL);
6179 gcc_assert (!TREE_STATIC (decl));
6181 if (DECL_SIZE (decl) == NULL_TREE)
6183 /* If we used it already as memory, it must stay in memory. */
6184 DECL_INITIAL (decl) = NULL_TREE;
6185 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
6186 return;
6189 if (type == error_mark_node)
6190 return;
6192 /* Compute and store the initial value. */
6193 already_used = TREE_USED (decl) || TREE_USED (type);
6194 if (TREE_USED (type))
6195 DECL_READ_P (decl) = 1;
6197 /* Generate a cleanup, if necessary. */
6198 cleanup = cxx_maybe_build_cleanup (decl, tf_warning_or_error);
6200 /* Perform the initialization. */
6201 if (init)
6203 tree rinit = (TREE_CODE (init) == INIT_EXPR
6204 ? TREE_OPERAND (init, 1) : NULL_TREE);
6205 if (rinit && !TREE_SIDE_EFFECTS (rinit))
6207 /* Stick simple initializers in DECL_INITIAL so that
6208 -Wno-init-self works (c++/34772). */
6209 gcc_assert (TREE_OPERAND (init, 0) == decl);
6210 DECL_INITIAL (decl) = rinit;
6212 if (warn_init_self && TREE_CODE (type) == REFERENCE_TYPE)
6214 STRIP_NOPS (rinit);
6215 if (rinit == decl)
6216 warning_at (DECL_SOURCE_LOCATION (decl),
6217 OPT_Winit_self,
6218 "reference %qD is initialized with itself", decl);
6221 else
6223 int saved_stmts_are_full_exprs_p;
6225 /* If we're only initializing a single object, guard the
6226 destructors of any temporaries used in its initializer with
6227 its destructor. This isn't right for arrays because each
6228 element initialization is a full-expression. */
6229 if (cleanup && TREE_CODE (type) != ARRAY_TYPE)
6230 wrap_temporary_cleanups (init, cleanup);
6232 gcc_assert (building_stmt_list_p ());
6233 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
6234 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
6235 finish_expr_stmt (init);
6236 current_stmt_tree ()->stmts_are_full_exprs_p =
6237 saved_stmts_are_full_exprs_p;
6241 /* Set this to 0 so we can tell whether an aggregate which was
6242 initialized was ever used. Don't do this if it has a
6243 destructor, so we don't complain about the 'resource
6244 allocation is initialization' idiom. Now set
6245 attribute((unused)) on types so decls of that type will be
6246 marked used. (see TREE_USED, above.) */
6247 if (TYPE_NEEDS_CONSTRUCTING (type)
6248 && ! already_used
6249 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
6250 && DECL_NAME (decl))
6251 TREE_USED (decl) = 0;
6252 else if (already_used)
6253 TREE_USED (decl) = 1;
6255 if (cleanup)
6256 finish_decl_cleanup (decl, cleanup);
6259 /* DECL is a VAR_DECL for a compiler-generated variable with static
6260 storage duration (like a virtual table) whose initializer is a
6261 compile-time constant. Initialize the variable and provide it to the
6262 back end. */
6264 void
6265 initialize_artificial_var (tree decl, vec<constructor_elt, va_gc> *v)
6267 tree init;
6268 gcc_assert (DECL_ARTIFICIAL (decl));
6269 init = build_constructor (TREE_TYPE (decl), v);
6270 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
6271 DECL_INITIAL (decl) = init;
6272 DECL_INITIALIZED_P (decl) = 1;
6273 determine_visibility (decl);
6274 layout_var_decl (decl);
6275 maybe_commonize_var (decl);
6276 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
6279 /* INIT is the initializer for a variable, as represented by the
6280 parser. Returns true iff INIT is type-dependent. */
6282 static bool
6283 type_dependent_init_p (tree init)
6285 if (TREE_CODE (init) == TREE_LIST)
6286 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
6287 return any_type_dependent_elements_p (init);
6288 else if (TREE_CODE (init) == CONSTRUCTOR)
6289 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
6291 vec<constructor_elt, va_gc> *elts;
6292 size_t nelts;
6293 size_t i;
6295 elts = CONSTRUCTOR_ELTS (init);
6296 nelts = vec_safe_length (elts);
6297 for (i = 0; i < nelts; ++i)
6298 if (type_dependent_init_p ((*elts)[i].value))
6299 return true;
6301 else
6302 /* It must be a simple expression, e.g., int i = 3; */
6303 return type_dependent_expression_p (init);
6305 return false;
6308 /* INIT is the initializer for a variable, as represented by the
6309 parser. Returns true iff INIT is value-dependent. */
6311 static bool
6312 value_dependent_init_p (tree init)
6314 if (TREE_CODE (init) == TREE_LIST)
6315 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
6316 return any_value_dependent_elements_p (init);
6317 else if (TREE_CODE (init) == CONSTRUCTOR)
6318 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
6320 vec<constructor_elt, va_gc> *elts;
6321 size_t nelts;
6322 size_t i;
6324 elts = CONSTRUCTOR_ELTS (init);
6325 nelts = vec_safe_length (elts);
6326 for (i = 0; i < nelts; ++i)
6327 if (value_dependent_init_p ((*elts)[i].value))
6328 return true;
6330 else
6331 /* It must be a simple expression, e.g., int i = 3; */
6332 return value_dependent_expression_p (init);
6334 return false;
6337 /* Finish processing of a declaration;
6338 install its line number and initial value.
6339 If the length of an array type is not known before,
6340 it must be determined now, from the initial value, or it is an error.
6342 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
6343 true, then INIT is an integral constant expression.
6345 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
6346 if the (init) syntax was used. */
6348 void
6349 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
6350 tree asmspec_tree, int flags)
6352 tree type;
6353 vec<tree, va_gc> *cleanups = NULL;
6354 const char *asmspec = NULL;
6355 int was_readonly = 0;
6356 bool var_definition_p = false;
6357 tree auto_node;
6359 if (decl == error_mark_node)
6360 return;
6361 else if (! decl)
6363 if (init)
6364 error ("assignment (not initialization) in declaration");
6365 return;
6368 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
6369 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
6370 gcc_assert (TREE_CODE (decl) != PARM_DECL);
6372 type = TREE_TYPE (decl);
6373 if (type == error_mark_node)
6374 return;
6376 /* If a name was specified, get the string. */
6377 if (at_namespace_scope_p ())
6378 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
6379 if (asmspec_tree && asmspec_tree != error_mark_node)
6380 asmspec = TREE_STRING_POINTER (asmspec_tree);
6382 if (current_class_type
6383 && CP_DECL_CONTEXT (decl) == current_class_type
6384 && TYPE_BEING_DEFINED (current_class_type)
6385 && !CLASSTYPE_TEMPLATE_INSTANTIATION (current_class_type)
6386 && (DECL_INITIAL (decl) || init))
6387 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
6389 if (TREE_CODE (decl) != FUNCTION_DECL
6390 && (auto_node = type_uses_auto (type)))
6392 tree d_init;
6393 if (init == NULL_TREE)
6395 if (DECL_LANG_SPECIFIC (decl)
6396 && DECL_TEMPLATE_INSTANTIATION (decl)
6397 && !DECL_TEMPLATE_INSTANTIATED (decl))
6399 /* init is null because we're deferring instantiating the
6400 initializer until we need it. Well, we need it now. */
6401 instantiate_decl (decl, /*defer_ok*/true, /*expl*/false);
6402 return;
6405 error ("declaration of %q#D has no initializer", decl);
6406 TREE_TYPE (decl) = error_mark_node;
6407 return;
6409 d_init = init;
6410 if (TREE_CODE (d_init) == TREE_LIST)
6411 d_init = build_x_compound_expr_from_list (d_init, ELK_INIT,
6412 tf_warning_or_error);
6413 d_init = resolve_nondeduced_context (d_init);
6414 type = TREE_TYPE (decl) = do_auto_deduction (type, d_init,
6415 auto_node);
6416 if (type == error_mark_node)
6417 return;
6418 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
6421 if (!ensure_literal_type_for_constexpr_object (decl))
6422 DECL_DECLARED_CONSTEXPR_P (decl) = 0;
6424 if (VAR_P (decl)
6425 && DECL_CLASS_SCOPE_P (decl)
6426 && DECL_INITIALIZED_IN_CLASS_P (decl))
6427 check_static_variable_definition (decl, type);
6429 if (init && TREE_CODE (decl) == FUNCTION_DECL)
6431 tree clone;
6432 if (init == ridpointers[(int)RID_DELETE])
6434 /* FIXME check this is 1st decl. */
6435 DECL_DELETED_FN (decl) = 1;
6436 DECL_DECLARED_INLINE_P (decl) = 1;
6437 DECL_INITIAL (decl) = error_mark_node;
6438 FOR_EACH_CLONE (clone, decl)
6440 DECL_DELETED_FN (clone) = 1;
6441 DECL_DECLARED_INLINE_P (clone) = 1;
6442 DECL_INITIAL (clone) = error_mark_node;
6444 init = NULL_TREE;
6446 else if (init == ridpointers[(int)RID_DEFAULT])
6448 if (defaultable_fn_check (decl))
6449 DECL_DEFAULTED_FN (decl) = 1;
6450 else
6451 DECL_INITIAL (decl) = NULL_TREE;
6455 if (init && VAR_P (decl))
6457 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
6458 /* If DECL is a reference, then we want to know whether init is a
6459 reference constant; init_const_expr_p as passed tells us whether
6460 it's an rvalue constant. */
6461 if (TREE_CODE (type) == REFERENCE_TYPE)
6462 init_const_expr_p = potential_constant_expression (init);
6463 if (init_const_expr_p)
6465 /* Set these flags now for templates. We'll update the flags in
6466 store_init_value for instantiations. */
6467 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
6468 if (decl_maybe_constant_var_p (decl))
6469 TREE_CONSTANT (decl) = 1;
6473 if (processing_template_decl)
6475 bool type_dependent_p;
6477 /* Add this declaration to the statement-tree. */
6478 if (at_function_scope_p ())
6479 add_decl_expr (decl);
6481 type_dependent_p = dependent_type_p (type);
6483 if (check_for_bare_parameter_packs (init))
6485 init = NULL_TREE;
6486 DECL_INITIAL (decl) = NULL_TREE;
6489 /* Generally, initializers in templates are expanded when the
6490 template is instantiated. But, if DECL is a variable constant
6491 then it can be used in future constant expressions, so its value
6492 must be available. */
6494 if (!VAR_P (decl) || dependent_type_p (type))
6495 /* We can't do anything if the decl has dependent type. */;
6496 else if (init
6497 && init_const_expr_p
6498 && !type_dependent_p
6499 && TREE_CODE (type) != REFERENCE_TYPE
6500 && decl_maybe_constant_var_p (decl)
6501 && !type_dependent_init_p (init)
6502 && !value_dependent_init_p (init))
6504 /* This variable seems to be a non-dependent constant, so process
6505 its initializer. If check_initializer returns non-null the
6506 initialization wasn't constant after all. */
6507 tree init_code;
6508 cleanups = make_tree_vector ();
6509 init_code = check_initializer (decl, init, flags, &cleanups);
6510 if (init_code == NULL_TREE)
6511 init = NULL_TREE;
6512 release_tree_vector (cleanups);
6514 else if (!DECL_PRETTY_FUNCTION_P (decl))
6516 /* Deduce array size even if the initializer is dependent. */
6517 maybe_deduce_size_from_array_init (decl, init);
6518 /* And complain about multiple initializers. */
6519 if (init && TREE_CODE (init) == TREE_LIST && TREE_CHAIN (init)
6520 && !MAYBE_CLASS_TYPE_P (type))
6521 init = build_x_compound_expr_from_list (init, ELK_INIT,
6522 tf_warning_or_error);
6525 if (init)
6526 DECL_INITIAL (decl) = init;
6527 return;
6530 /* Just store non-static data member initializers for later. */
6531 if (init && TREE_CODE (decl) == FIELD_DECL)
6532 DECL_INITIAL (decl) = init;
6534 /* Take care of TYPE_DECLs up front. */
6535 if (TREE_CODE (decl) == TYPE_DECL)
6537 if (type != error_mark_node
6538 && MAYBE_CLASS_TYPE_P (type) && DECL_NAME (decl))
6540 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
6541 warning (0, "shadowing previous type declaration of %q#D", decl);
6542 set_identifier_type_value (DECL_NAME (decl), decl);
6545 /* If we have installed this as the canonical typedef for this
6546 type, and that type has not been defined yet, delay emitting
6547 the debug information for it, as we will emit it later. */
6548 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
6549 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
6550 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
6552 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl),
6553 at_eof);
6554 return;
6557 /* A reference will be modified here, as it is initialized. */
6558 if (! DECL_EXTERNAL (decl)
6559 && TREE_READONLY (decl)
6560 && TREE_CODE (type) == REFERENCE_TYPE)
6562 was_readonly = 1;
6563 TREE_READONLY (decl) = 0;
6566 if (VAR_P (decl))
6568 /* If this is a local variable that will need a mangled name,
6569 register it now. We must do this before processing the
6570 initializer for the variable, since the initialization might
6571 require a guard variable, and since the mangled name of the
6572 guard variable will depend on the mangled name of this
6573 variable. */
6574 if (DECL_FUNCTION_SCOPE_P (decl)
6575 && TREE_STATIC (decl)
6576 && !DECL_ARTIFICIAL (decl))
6578 push_local_name (decl);
6579 if (DECL_CONSTRUCTOR_P (current_function_decl)
6580 || DECL_DESTRUCTOR_P (current_function_decl))
6581 /* Normally local_decls is populated during GIMPLE lowering,
6582 but [cd]tors are never actually compiled directly. We need
6583 to put statics on the list so we can deal with the label
6584 address extension. FIXME. */
6585 add_local_decl (cfun, decl);
6588 /* Convert the initializer to the type of DECL, if we have not
6589 already initialized DECL. */
6590 if (!DECL_INITIALIZED_P (decl)
6591 /* If !DECL_EXTERNAL then DECL is being defined. In the
6592 case of a static data member initialized inside the
6593 class-specifier, there can be an initializer even if DECL
6594 is *not* defined. */
6595 && (!DECL_EXTERNAL (decl) || init))
6597 if (TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6599 tree jclass
6600 = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
6601 /* Allow libjava/prims.cc define primitive classes. */
6602 if (init != NULL_TREE
6603 || jclass == NULL_TREE
6604 || TREE_CODE (jclass) != TYPE_DECL
6605 || !POINTER_TYPE_P (TREE_TYPE (jclass))
6606 || !same_type_ignoring_top_level_qualifiers_p
6607 (type, TREE_TYPE (TREE_TYPE (jclass))))
6608 error ("Java object %qD not allocated with %<new%>", decl);
6609 init = NULL_TREE;
6611 cleanups = make_tree_vector ();
6612 init = check_initializer (decl, init, flags, &cleanups);
6614 /* Handle:
6616 [dcl.init]
6618 The memory occupied by any object of static storage
6619 duration is zero-initialized at program startup before
6620 any other initialization takes place.
6622 We cannot create an appropriate initializer until after
6623 the type of DECL is finalized. If DECL_INITIAL is set,
6624 then the DECL is statically initialized, and any
6625 necessary zero-initialization has already been performed. */
6626 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
6627 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
6628 /*nelts=*/NULL_TREE,
6629 /*static_storage_p=*/true);
6630 /* Remember that the initialization for this variable has
6631 taken place. */
6632 DECL_INITIALIZED_P (decl) = 1;
6633 /* This declaration is the definition of this variable,
6634 unless we are initializing a static data member within
6635 the class specifier. */
6636 if (!DECL_EXTERNAL (decl))
6637 var_definition_p = true;
6639 /* If the variable has an array type, lay out the type, even if
6640 there is no initializer. It is valid to index through the
6641 array, and we must get TYPE_ALIGN set correctly on the array
6642 type. */
6643 else if (TREE_CODE (type) == ARRAY_TYPE)
6644 layout_type (type);
6646 if (TREE_STATIC (decl)
6647 && !at_function_scope_p ()
6648 && current_function_decl == NULL)
6649 /* So decl is a global variable or a static member of a
6650 non local class. Record the types it uses
6651 so that we can decide later to emit debug info for them. */
6652 record_types_used_by_current_var_decl (decl);
6654 else if (TREE_CODE (decl) == FIELD_DECL
6655 && TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6656 error ("non-static data member %qD has Java class type", decl);
6658 /* Add this declaration to the statement-tree. This needs to happen
6659 after the call to check_initializer so that the DECL_EXPR for a
6660 reference temp is added before the DECL_EXPR for the reference itself. */
6661 if (DECL_FUNCTION_SCOPE_P (decl))
6663 /* If we're building a variable sized type, and we might be
6664 reachable other than via the top of the current binding
6665 level, then create a new BIND_EXPR so that we deallocate
6666 the object at the right time. */
6667 if (VAR_P (decl)
6668 && DECL_SIZE (decl)
6669 && !TREE_CONSTANT (DECL_SIZE (decl))
6670 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list))
6672 tree bind;
6673 bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL);
6674 TREE_SIDE_EFFECTS (bind) = 1;
6675 add_stmt (bind);
6676 BIND_EXPR_BODY (bind) = push_stmt_list ();
6678 add_decl_expr (decl);
6681 /* Let the middle end know about variables and functions -- but not
6682 static data members in uninstantiated class templates. */
6683 if (VAR_OR_FUNCTION_DECL_P (decl))
6685 if (VAR_P (decl))
6687 layout_var_decl (decl);
6688 maybe_commonize_var (decl);
6691 /* This needs to happen after the linkage is set. */
6692 determine_visibility (decl);
6694 if (var_definition_p && TREE_STATIC (decl))
6696 /* If a TREE_READONLY variable needs initialization
6697 at runtime, it is no longer readonly and we need to
6698 avoid MEM_READONLY_P being set on RTL created for it. */
6699 if (init)
6701 if (TREE_READONLY (decl))
6702 TREE_READONLY (decl) = 0;
6703 was_readonly = 0;
6705 else if (was_readonly)
6706 TREE_READONLY (decl) = 1;
6708 /* Likewise if it needs destruction. */
6709 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
6710 TREE_READONLY (decl) = 0;
6713 make_rtl_for_nonlocal_decl (decl, init, asmspec);
6715 /* Check for abstractness of the type. Notice that there is no
6716 need to strip array types here since the check for those types
6717 is already done within create_array_type_for_decl. */
6718 abstract_virtuals_error (decl, type);
6720 if (TREE_TYPE (decl) == error_mark_node)
6721 /* No initialization required. */
6723 else if (TREE_CODE (decl) == FUNCTION_DECL)
6725 if (init)
6727 if (init == ridpointers[(int)RID_DEFAULT])
6729 /* An out-of-class default definition is defined at
6730 the point where it is explicitly defaulted. */
6731 if (DECL_DELETED_FN (decl))
6732 maybe_explain_implicit_delete (decl);
6733 else if (DECL_INITIAL (decl) == error_mark_node)
6734 synthesize_method (decl);
6736 else
6737 error ("function %q#D is initialized like a variable", decl);
6739 /* else no initialization required. */
6741 else if (DECL_EXTERNAL (decl)
6742 && ! (DECL_LANG_SPECIFIC (decl)
6743 && DECL_NOT_REALLY_EXTERN (decl)))
6745 if (init)
6746 DECL_INITIAL (decl) = init;
6748 /* A variable definition. */
6749 else if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
6750 /* Initialize the local variable. */
6751 initialize_local_var (decl, init);
6753 /* If a variable is defined, and then a subsequent
6754 definition with external linkage is encountered, we will
6755 get here twice for the same variable. We want to avoid
6756 calling expand_static_init more than once. For variables
6757 that are not static data members, we can call
6758 expand_static_init only when we actually process the
6759 initializer. It is not legal to redeclare a static data
6760 member, so this issue does not arise in that case. */
6761 else if (var_definition_p && TREE_STATIC (decl))
6762 expand_static_init (decl, init);
6765 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
6766 reference, insert it in the statement-tree now. */
6767 if (cleanups)
6769 unsigned i; tree t;
6770 FOR_EACH_VEC_ELT (*cleanups, i, t)
6771 push_cleanup (decl, t, false);
6772 release_tree_vector (cleanups);
6775 if (was_readonly)
6776 TREE_READONLY (decl) = 1;
6778 invoke_plugin_callbacks (PLUGIN_FINISH_DECL, decl);
6781 /* Returns a declaration for a VAR_DECL as if:
6783 extern "C" TYPE NAME;
6785 had been seen. Used to create compiler-generated global
6786 variables. */
6788 static tree
6789 declare_global_var (tree name, tree type)
6791 tree decl;
6793 push_to_top_level ();
6794 decl = build_decl (input_location, VAR_DECL, name, type);
6795 TREE_PUBLIC (decl) = 1;
6796 DECL_EXTERNAL (decl) = 1;
6797 DECL_ARTIFICIAL (decl) = 1;
6798 /* If the user has explicitly declared this variable (perhaps
6799 because the code we are compiling is part of a low-level runtime
6800 library), then it is possible that our declaration will be merged
6801 with theirs by pushdecl. */
6802 decl = pushdecl (decl);
6803 cp_finish_decl (decl, NULL_TREE, false, NULL_TREE, 0);
6804 pop_from_top_level ();
6806 return decl;
6809 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
6810 if "__cxa_atexit" is not being used) corresponding to the function
6811 to be called when the program exits. */
6813 static tree
6814 get_atexit_fn_ptr_type (void)
6816 tree fn_type;
6818 if (!atexit_fn_ptr_type_node)
6820 tree arg_type;
6821 if (flag_use_cxa_atexit
6822 && !targetm.cxx.use_atexit_for_cxa_atexit ())
6823 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
6824 arg_type = ptr_type_node;
6825 else
6826 /* The parameter to "atexit" is "void (*)(void)". */
6827 arg_type = NULL_TREE;
6829 fn_type = build_function_type_list (void_type_node,
6830 arg_type, NULL_TREE);
6831 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
6834 return atexit_fn_ptr_type_node;
6837 /* Returns a pointer to the `atexit' function. Note that if
6838 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
6839 `__cxa_atexit' function specified in the IA64 C++ ABI. */
6841 static tree
6842 get_atexit_node (void)
6844 tree atexit_fndecl;
6845 tree fn_type;
6846 tree fn_ptr_type;
6847 const char *name;
6848 bool use_aeabi_atexit;
6850 if (atexit_node)
6851 return atexit_node;
6853 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6855 /* The declaration for `__cxa_atexit' is:
6857 int __cxa_atexit (void (*)(void *), void *, void *)
6859 We build up the argument types and then the function type
6860 itself. */
6861 tree argtype0, argtype1, argtype2;
6863 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
6864 /* First, build the pointer-to-function type for the first
6865 argument. */
6866 fn_ptr_type = get_atexit_fn_ptr_type ();
6867 /* Then, build the rest of the argument types. */
6868 argtype2 = ptr_type_node;
6869 if (use_aeabi_atexit)
6871 argtype1 = fn_ptr_type;
6872 argtype0 = ptr_type_node;
6874 else
6876 argtype1 = ptr_type_node;
6877 argtype0 = fn_ptr_type;
6879 /* And the final __cxa_atexit type. */
6880 fn_type = build_function_type_list (integer_type_node,
6881 argtype0, argtype1, argtype2,
6882 NULL_TREE);
6883 if (use_aeabi_atexit)
6884 name = "__aeabi_atexit";
6885 else
6886 name = "__cxa_atexit";
6888 else
6890 /* The declaration for `atexit' is:
6892 int atexit (void (*)());
6894 We build up the argument types and then the function type
6895 itself. */
6896 fn_ptr_type = get_atexit_fn_ptr_type ();
6897 /* Build the final atexit type. */
6898 fn_type = build_function_type_list (integer_type_node,
6899 fn_ptr_type, NULL_TREE);
6900 name = "atexit";
6903 /* Now, build the function declaration. */
6904 push_lang_context (lang_name_c);
6905 atexit_fndecl = build_library_fn_ptr (name, fn_type, ECF_LEAF | ECF_NOTHROW);
6906 mark_used (atexit_fndecl);
6907 pop_lang_context ();
6908 atexit_node = decay_conversion (atexit_fndecl, tf_warning_or_error);
6910 return atexit_node;
6913 /* Like get_atexit_node, but for thread-local cleanups. */
6915 static tree
6916 get_thread_atexit_node (void)
6918 /* The declaration for `__cxa_thread_atexit' is:
6920 int __cxa_thread_atexit (void (*)(void *), void *, void *) */
6921 tree fn_type = build_function_type_list (integer_type_node,
6922 get_atexit_fn_ptr_type (),
6923 ptr_type_node, ptr_type_node,
6924 NULL_TREE);
6926 /* Now, build the function declaration. */
6927 tree atexit_fndecl = build_library_fn_ptr ("__cxa_thread_atexit", fn_type,
6928 ECF_LEAF | ECF_NOTHROW);
6929 return decay_conversion (atexit_fndecl, tf_warning_or_error);
6932 /* Returns the __dso_handle VAR_DECL. */
6934 static tree
6935 get_dso_handle_node (void)
6937 if (dso_handle_node)
6938 return dso_handle_node;
6940 /* Declare the variable. */
6941 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
6942 ptr_type_node);
6944 #ifdef HAVE_GAS_HIDDEN
6945 if (dso_handle_node != error_mark_node)
6947 DECL_VISIBILITY (dso_handle_node) = VISIBILITY_HIDDEN;
6948 DECL_VISIBILITY_SPECIFIED (dso_handle_node) = 1;
6950 #endif
6952 return dso_handle_node;
6955 /* Begin a new function with internal linkage whose job will be simply
6956 to destroy some particular variable. */
6958 static GTY(()) int start_cleanup_cnt;
6960 static tree
6961 start_cleanup_fn (void)
6963 char name[32];
6964 tree fntype;
6965 tree fndecl;
6966 bool use_cxa_atexit = flag_use_cxa_atexit
6967 && !targetm.cxx.use_atexit_for_cxa_atexit ();
6969 push_to_top_level ();
6971 /* No need to mangle this. */
6972 push_lang_context (lang_name_c);
6974 /* Build the name of the function. */
6975 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
6976 /* Build the function declaration. */
6977 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
6978 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
6979 /* It's a function with internal linkage, generated by the
6980 compiler. */
6981 TREE_PUBLIC (fndecl) = 0;
6982 DECL_ARTIFICIAL (fndecl) = 1;
6983 /* Make the function `inline' so that it is only emitted if it is
6984 actually needed. It is unlikely that it will be inlined, since
6985 it is only called via a function pointer, but we avoid unnecessary
6986 emissions this way. */
6987 DECL_DECLARED_INLINE_P (fndecl) = 1;
6988 DECL_INTERFACE_KNOWN (fndecl) = 1;
6989 /* Build the parameter. */
6990 if (use_cxa_atexit)
6992 tree parmdecl;
6994 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
6995 DECL_CONTEXT (parmdecl) = fndecl;
6996 TREE_USED (parmdecl) = 1;
6997 DECL_READ_P (parmdecl) = 1;
6998 DECL_ARGUMENTS (fndecl) = parmdecl;
7001 pushdecl (fndecl);
7002 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
7004 pop_lang_context ();
7006 return current_function_decl;
7009 /* Finish the cleanup function begun by start_cleanup_fn. */
7011 static void
7012 end_cleanup_fn (void)
7014 expand_or_defer_fn (finish_function (0));
7016 pop_from_top_level ();
7019 /* Generate code to handle the destruction of DECL, an object with
7020 static storage duration. */
7022 tree
7023 register_dtor_fn (tree decl)
7025 tree cleanup;
7026 tree addr;
7027 tree compound_stmt;
7028 tree fcall;
7029 tree type;
7030 bool ob_parm, dso_parm, use_dtor;
7031 tree arg0, arg1, arg2;
7032 tree atex_node;
7034 type = TREE_TYPE (decl);
7035 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
7036 return void_node;
7038 /* If we're using "__cxa_atexit" (or "__cxa_thread_atexit" or
7039 "__aeabi_atexit"), and DECL is a class object, we can just pass the
7040 destructor to "__cxa_atexit"; we don't have to build a temporary
7041 function to do the cleanup. */
7042 dso_parm = (flag_use_cxa_atexit
7043 && !targetm.cxx.use_atexit_for_cxa_atexit ());
7044 ob_parm = (DECL_THREAD_LOCAL_P (decl) || dso_parm);
7045 use_dtor = ob_parm && CLASS_TYPE_P (type);
7046 if (use_dtor)
7048 int idx;
7050 /* Find the destructor. */
7051 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
7052 gcc_assert (idx >= 0);
7053 cleanup = (*CLASSTYPE_METHOD_VEC (type))[idx];
7054 /* Make sure it is accessible. */
7055 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup,
7056 tf_warning_or_error);
7058 else
7060 /* Call build_cleanup before we enter the anonymous function so
7061 that any access checks will be done relative to the current
7062 scope, rather than the scope of the anonymous function. */
7063 build_cleanup (decl);
7065 /* Now start the function. */
7066 cleanup = start_cleanup_fn ();
7068 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
7069 to the original function, rather than the anonymous one. That
7070 will make the back end think that nested functions are in use,
7071 which causes confusion. */
7072 push_deferring_access_checks (dk_no_check);
7073 fcall = build_cleanup (decl);
7074 pop_deferring_access_checks ();
7076 /* Create the body of the anonymous function. */
7077 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
7078 finish_expr_stmt (fcall);
7079 finish_compound_stmt (compound_stmt);
7080 end_cleanup_fn ();
7083 /* Call atexit with the cleanup function. */
7084 mark_used (cleanup);
7085 cleanup = build_address (cleanup);
7087 if (DECL_THREAD_LOCAL_P (decl))
7088 atex_node = get_thread_atexit_node ();
7089 else
7090 atex_node = get_atexit_node ();
7092 if (use_dtor)
7094 /* We must convert CLEANUP to the type that "__cxa_atexit"
7095 expects. */
7096 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
7097 /* "__cxa_atexit" will pass the address of DECL to the
7098 cleanup function. */
7099 mark_used (decl);
7100 addr = build_address (decl);
7101 /* The declared type of the parameter to "__cxa_atexit" is
7102 "void *". For plain "T*", we could just let the
7103 machinery in cp_build_function_call convert it -- but if the
7104 type is "cv-qualified T *", then we need to convert it
7105 before passing it in, to avoid spurious errors. */
7106 addr = build_nop (ptr_type_node, addr);
7108 else
7109 /* Since the cleanup functions we build ignore the address
7110 they're given, there's no reason to pass the actual address
7111 in, and, in general, it's cheaper to pass NULL than any
7112 other value. */
7113 addr = null_pointer_node;
7115 if (dso_parm)
7116 arg2 = cp_build_addr_expr (get_dso_handle_node (),
7117 tf_warning_or_error);
7118 else if (ob_parm)
7119 /* Just pass NULL to the dso handle parm if we don't actually
7120 have a DSO handle on this target. */
7121 arg2 = null_pointer_node;
7122 else
7123 arg2 = NULL_TREE;
7125 if (ob_parm)
7127 if (!DECL_THREAD_LOCAL_P (decl)
7128 && targetm.cxx.use_aeabi_atexit ())
7130 arg1 = cleanup;
7131 arg0 = addr;
7133 else
7135 arg1 = addr;
7136 arg0 = cleanup;
7139 else
7141 arg0 = cleanup;
7142 arg1 = NULL_TREE;
7144 return cp_build_function_call_nary (atex_node, tf_warning_or_error,
7145 arg0, arg1, arg2, NULL_TREE);
7148 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
7149 is its initializer. Generate code to handle the construction
7150 and destruction of DECL. */
7152 static void
7153 expand_static_init (tree decl, tree init)
7155 gcc_assert (VAR_P (decl));
7156 gcc_assert (TREE_STATIC (decl));
7158 /* Some variables require no dynamic initialization. */
7159 if (!init
7160 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
7162 /* Make sure the destructor is callable. */
7163 cxx_maybe_build_cleanup (decl, tf_warning_or_error);
7164 return;
7167 if (DECL_THREAD_LOCAL_P (decl) && DECL_GNU_TLS_P (decl)
7168 && !DECL_FUNCTION_SCOPE_P (decl))
7170 if (init)
7171 error ("non-local variable %qD declared %<__thread%> "
7172 "needs dynamic initialization", decl);
7173 else
7174 error ("non-local variable %qD declared %<__thread%> "
7175 "has a non-trivial destructor", decl);
7176 static bool informed;
7177 if (!informed)
7179 inform (DECL_SOURCE_LOCATION (decl),
7180 "C++11 %<thread_local%> allows dynamic initialization "
7181 "and destruction");
7182 informed = true;
7184 return;
7187 if (DECL_FUNCTION_SCOPE_P (decl))
7189 /* Emit code to perform this initialization but once. */
7190 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
7191 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
7192 tree guard, guard_addr;
7193 tree flag, begin;
7194 /* We don't need thread-safety code for thread-local vars. */
7195 bool thread_guard = (flag_threadsafe_statics
7196 && !DECL_THREAD_LOCAL_P (decl));
7198 /* Emit code to perform this initialization but once. This code
7199 looks like:
7201 static <type> guard;
7202 if (!guard.first_byte) {
7203 if (__cxa_guard_acquire (&guard)) {
7204 bool flag = false;
7205 try {
7206 // Do initialization.
7207 flag = true; __cxa_guard_release (&guard);
7208 // Register variable for destruction at end of program.
7209 } catch {
7210 if (!flag) __cxa_guard_abort (&guard);
7214 Note that the `flag' variable is only set to 1 *after* the
7215 initialization is complete. This ensures that an exception,
7216 thrown during the construction, will cause the variable to
7217 reinitialized when we pass through this code again, as per:
7219 [stmt.dcl]
7221 If the initialization exits by throwing an exception, the
7222 initialization is not complete, so it will be tried again
7223 the next time control enters the declaration.
7225 This process should be thread-safe, too; multiple threads
7226 should not be able to initialize the variable more than
7227 once. */
7229 /* Create the guard variable. */
7230 guard = get_guard (decl);
7232 /* This optimization isn't safe on targets with relaxed memory
7233 consistency. On such targets we force synchronization in
7234 __cxa_guard_acquire. */
7235 if (!targetm.relaxed_ordering || !thread_guard)
7237 /* Begin the conditional initialization. */
7238 if_stmt = begin_if_stmt ();
7239 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
7240 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
7243 if (thread_guard)
7245 tree vfntype = NULL_TREE;
7246 tree acquire_name, release_name, abort_name;
7247 tree acquire_fn, release_fn, abort_fn;
7248 guard_addr = build_address (guard);
7250 acquire_name = get_identifier ("__cxa_guard_acquire");
7251 release_name = get_identifier ("__cxa_guard_release");
7252 abort_name = get_identifier ("__cxa_guard_abort");
7253 acquire_fn = identifier_global_value (acquire_name);
7254 release_fn = identifier_global_value (release_name);
7255 abort_fn = identifier_global_value (abort_name);
7256 if (!acquire_fn)
7257 acquire_fn = push_library_fn
7258 (acquire_name, build_function_type_list (integer_type_node,
7259 TREE_TYPE (guard_addr),
7260 NULL_TREE),
7261 NULL_TREE, ECF_NOTHROW | ECF_LEAF);
7262 if (!release_fn || !abort_fn)
7263 vfntype = build_function_type_list (void_type_node,
7264 TREE_TYPE (guard_addr),
7265 NULL_TREE);
7266 if (!release_fn)
7267 release_fn = push_library_fn (release_name, vfntype, NULL_TREE,
7268 ECF_NOTHROW | ECF_LEAF);
7269 if (!abort_fn)
7270 abort_fn = push_library_fn (abort_name, vfntype, NULL_TREE,
7271 ECF_NOTHROW | ECF_LEAF);
7273 inner_if_stmt = begin_if_stmt ();
7274 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
7275 inner_if_stmt);
7277 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
7278 begin = get_target_expr (boolean_false_node);
7279 flag = TARGET_EXPR_SLOT (begin);
7281 TARGET_EXPR_CLEANUP (begin)
7282 = build3 (COND_EXPR, void_type_node, flag,
7283 void_node,
7284 build_call_n (abort_fn, 1, guard_addr));
7285 CLEANUP_EH_ONLY (begin) = 1;
7287 /* Do the initialization itself. */
7288 init = add_stmt_to_compound (begin, init);
7289 init = add_stmt_to_compound
7290 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
7291 init = add_stmt_to_compound
7292 (init, build_call_n (release_fn, 1, guard_addr));
7294 else
7295 init = add_stmt_to_compound (init, set_guard (guard));
7297 /* Use atexit to register a function for destroying this static
7298 variable. */
7299 init = add_stmt_to_compound (init, register_dtor_fn (decl));
7301 finish_expr_stmt (init);
7303 if (thread_guard)
7305 finish_compound_stmt (inner_then_clause);
7306 finish_then_clause (inner_if_stmt);
7307 finish_if_stmt (inner_if_stmt);
7310 if (!targetm.relaxed_ordering || !thread_guard)
7312 finish_compound_stmt (then_clause);
7313 finish_then_clause (if_stmt);
7314 finish_if_stmt (if_stmt);
7317 else if (DECL_THREAD_LOCAL_P (decl))
7318 tls_aggregates = tree_cons (init, decl, tls_aggregates);
7319 else
7320 static_aggregates = tree_cons (init, decl, static_aggregates);
7324 /* Make TYPE a complete type based on INITIAL_VALUE.
7325 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
7326 2 if there was no information (in which case assume 0 if DO_DEFAULT),
7327 3 if the initializer list is empty (in pedantic mode). */
7330 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
7332 int failure;
7333 tree type, elt_type;
7335 /* Don't get confused by a CONSTRUCTOR for some other type. */
7336 if (initial_value && TREE_CODE (initial_value) == CONSTRUCTOR
7337 && !BRACE_ENCLOSED_INITIALIZER_P (initial_value))
7338 return 1;
7340 if (initial_value)
7342 unsigned HOST_WIDE_INT i;
7343 tree value;
7345 /* An array of character type can be initialized from a
7346 brace-enclosed string constant.
7348 FIXME: this code is duplicated from reshape_init. Probably
7349 we should just call reshape_init here? */
7350 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
7351 && TREE_CODE (initial_value) == CONSTRUCTOR
7352 && !vec_safe_is_empty (CONSTRUCTOR_ELTS (initial_value)))
7354 vec<constructor_elt, va_gc> *v = CONSTRUCTOR_ELTS (initial_value);
7355 tree value = (*v)[0].value;
7357 if (TREE_CODE (value) == STRING_CST
7358 && v->length () == 1)
7359 initial_value = value;
7362 /* If any of the elements are parameter packs, we can't actually
7363 complete this type now because the array size is dependent. */
7364 if (TREE_CODE (initial_value) == CONSTRUCTOR)
7366 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value),
7367 i, value)
7369 if (PACK_EXPANSION_P (value))
7370 return 0;
7375 failure = complete_array_type (ptype, initial_value, do_default);
7377 /* We can create the array before the element type is complete, which
7378 means that we didn't have these two bits set in the original type
7379 either. In completing the type, we are expected to propagate these
7380 bits. See also complete_type which does the same thing for arrays
7381 of fixed size. */
7382 type = *ptype;
7383 if (TYPE_DOMAIN (type))
7385 elt_type = TREE_TYPE (type);
7386 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
7387 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
7388 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
7391 return failure;
7394 /* As above, but either give an error or reject zero-size arrays, depending
7395 on COMPLAIN. */
7398 cp_complete_array_type_or_error (tree *ptype, tree initial_value,
7399 bool do_default, tsubst_flags_t complain)
7401 int failure;
7402 bool sfinae = !(complain & tf_error);
7403 /* In SFINAE context we can't be lenient about zero-size arrays. */
7404 if (sfinae)
7405 ++pedantic;
7406 failure = cp_complete_array_type (ptype, initial_value, do_default);
7407 if (sfinae)
7408 --pedantic;
7409 if (failure)
7411 if (sfinae)
7412 /* Not an error. */;
7413 else if (failure == 1)
7414 error ("initializer fails to determine size of %qT", *ptype);
7415 else if (failure == 2)
7417 if (do_default)
7418 error ("array size missing in %qT", *ptype);
7420 else if (failure == 3)
7421 error ("zero-size array %qT", *ptype);
7422 *ptype = error_mark_node;
7424 return failure;
7427 /* Return zero if something is declared to be a member of type
7428 CTYPE when in the context of CUR_TYPE. STRING is the error
7429 message to print in that case. Otherwise, quietly return 1. */
7431 static int
7432 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
7434 if (ctype && ctype != cur_type)
7436 if (flags == DTOR_FLAG)
7437 error ("destructor for alien class %qT cannot be a member", ctype);
7438 else
7439 error ("constructor for alien class %qT cannot be a member", ctype);
7440 return 0;
7442 return 1;
7445 /* Subroutine of `grokdeclarator'. */
7447 /* Generate errors possibly applicable for a given set of specifiers.
7448 This is for ARM $7.1.2. */
7450 static void
7451 bad_specifiers (tree object,
7452 enum bad_spec_place type,
7453 int virtualp,
7454 int quals,
7455 int inlinep,
7456 int friendp,
7457 int raises)
7459 switch (type)
7461 case BSP_VAR:
7462 if (virtualp)
7463 error ("%qD declared as a %<virtual%> variable", object);
7464 if (inlinep)
7465 error ("%qD declared as an %<inline%> variable", object);
7466 if (quals)
7467 error ("%<const%> and %<volatile%> function specifiers on "
7468 "%qD invalid in variable declaration", object);
7469 break;
7470 case BSP_PARM:
7471 if (virtualp)
7472 error ("%qD declared as a %<virtual%> parameter", object);
7473 if (inlinep)
7474 error ("%qD declared as an %<inline%> parameter", object);
7475 if (quals)
7476 error ("%<const%> and %<volatile%> function specifiers on "
7477 "%qD invalid in parameter declaration", object);
7478 break;
7479 case BSP_TYPE:
7480 if (virtualp)
7481 error ("%qD declared as a %<virtual%> type", object);
7482 if (inlinep)
7483 error ("%qD declared as an %<inline%> type", object);
7484 if (quals)
7485 error ("%<const%> and %<volatile%> function specifiers on "
7486 "%qD invalid in type declaration", object);
7487 break;
7488 case BSP_FIELD:
7489 if (virtualp)
7490 error ("%qD declared as a %<virtual%> field", object);
7491 if (inlinep)
7492 error ("%qD declared as an %<inline%> field", object);
7493 if (quals)
7494 error ("%<const%> and %<volatile%> function specifiers on "
7495 "%qD invalid in field declaration", object);
7496 break;
7497 default:
7498 gcc_unreachable();
7500 if (friendp)
7501 error ("%q+D declared as a friend", object);
7502 if (raises
7503 && (TREE_CODE (object) == TYPE_DECL
7504 || (!TYPE_PTRFN_P (TREE_TYPE (object))
7505 && !TYPE_REFFN_P (TREE_TYPE (object))
7506 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
7507 error ("%q+D declared with an exception specification", object);
7510 /* DECL is a member function or static data member and is presently
7511 being defined. Check that the definition is taking place in a
7512 valid namespace. */
7514 static void
7515 check_class_member_definition_namespace (tree decl)
7517 /* These checks only apply to member functions and static data
7518 members. */
7519 gcc_assert (VAR_OR_FUNCTION_DECL_P (decl));
7520 /* We check for problems with specializations in pt.c in
7521 check_specialization_namespace, where we can issue better
7522 diagnostics. */
7523 if (processing_specialization)
7524 return;
7525 /* There are no restrictions on the placement of
7526 explicit instantiations. */
7527 if (processing_explicit_instantiation)
7528 return;
7529 /* [class.mfct]
7531 A member function definition that appears outside of the
7532 class definition shall appear in a namespace scope enclosing
7533 the class definition.
7535 [class.static.data]
7537 The definition for a static data member shall appear in a
7538 namespace scope enclosing the member's class definition. */
7539 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
7540 permerror (input_location, "definition of %qD is not in namespace enclosing %qT",
7541 decl, DECL_CONTEXT (decl));
7544 /* Build a PARM_DECL for the "this" parameter. TYPE is the
7545 METHOD_TYPE for a non-static member function; QUALS are the
7546 cv-qualifiers that apply to the function. */
7548 tree
7549 build_this_parm (tree type, cp_cv_quals quals)
7551 tree this_type;
7552 tree qual_type;
7553 tree parm;
7554 cp_cv_quals this_quals;
7556 if (CLASS_TYPE_P (type))
7558 this_type
7559 = cp_build_qualified_type (type, quals & ~TYPE_QUAL_RESTRICT);
7560 this_type = build_pointer_type (this_type);
7562 else
7563 this_type = type_of_this_parm (type);
7564 /* The `this' parameter is implicitly `const'; it cannot be
7565 assigned to. */
7566 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
7567 qual_type = cp_build_qualified_type (this_type, this_quals);
7568 parm = build_artificial_parm (this_identifier, qual_type);
7569 cp_apply_type_quals_to_decl (this_quals, parm);
7570 return parm;
7573 /* DECL is a static member function. Complain if it was declared
7574 with function-cv-quals. */
7576 static void
7577 check_static_quals (tree decl, cp_cv_quals quals)
7579 if (quals != TYPE_UNQUALIFIED)
7580 error ("static member function %q#D declared with type qualifiers",
7581 decl);
7584 /* Helper function. Replace the temporary this parameter injected
7585 during cp_finish_omp_declare_simd with the real this parameter. */
7587 static tree
7588 declare_simd_adjust_this (tree *tp, int *walk_subtrees, void *data)
7590 tree this_parm = (tree) data;
7591 if (TREE_CODE (*tp) == PARM_DECL
7592 && DECL_NAME (*tp) == this_identifier
7593 && *tp != this_parm)
7594 *tp = this_parm;
7595 else if (TYPE_P (*tp))
7596 *walk_subtrees = 0;
7597 return NULL_TREE;
7600 /* CTYPE is class type, or null if non-class.
7601 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
7602 or METHOD_TYPE.
7603 DECLARATOR is the function's name.
7604 PARMS is a chain of PARM_DECLs for the function.
7605 VIRTUALP is truthvalue of whether the function is virtual or not.
7606 FLAGS are to be passed through to `grokclassfn'.
7607 QUALS are qualifiers indicating whether the function is `const'
7608 or `volatile'.
7609 RAISES is a list of exceptions that this function can raise.
7610 CHECK is 1 if we must find this method in CTYPE, 0 if we should
7611 not look, and -1 if we should not call `grokclassfn' at all.
7613 SFK is the kind of special function (if any) for the new function.
7615 Returns `NULL_TREE' if something goes wrong, after issuing
7616 applicable error messages. */
7618 static tree
7619 grokfndecl (tree ctype,
7620 tree type,
7621 tree declarator,
7622 tree parms,
7623 tree orig_declarator,
7624 int virtualp,
7625 enum overload_flags flags,
7626 cp_cv_quals quals,
7627 cp_ref_qualifier rqual,
7628 tree raises,
7629 int check,
7630 int friendp,
7631 int publicp,
7632 int inlinep,
7633 special_function_kind sfk,
7634 bool funcdef_flag,
7635 int template_count,
7636 tree in_namespace,
7637 tree* attrlist,
7638 location_t location)
7640 tree decl;
7641 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
7642 tree t;
7644 if (rqual)
7645 type = build_ref_qualified_type (type, rqual);
7646 if (raises)
7647 type = build_exception_variant (type, raises);
7649 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
7651 /* If we have an explicit location, use it, otherwise use whatever
7652 build_lang_decl used (probably input_location). */
7653 if (location != UNKNOWN_LOCATION)
7654 DECL_SOURCE_LOCATION (decl) = location;
7656 if (TREE_CODE (type) == METHOD_TYPE)
7658 tree parm;
7659 parm = build_this_parm (type, quals);
7660 DECL_CHAIN (parm) = parms;
7661 parms = parm;
7663 DECL_ARGUMENTS (decl) = parms;
7664 for (t = parms; t; t = DECL_CHAIN (t))
7665 DECL_CONTEXT (t) = decl;
7666 /* Propagate volatile out from type to decl. */
7667 if (TYPE_VOLATILE (type))
7668 TREE_THIS_VOLATILE (decl) = 1;
7670 /* Setup decl according to sfk. */
7671 switch (sfk)
7673 case sfk_constructor:
7674 case sfk_copy_constructor:
7675 case sfk_move_constructor:
7676 DECL_CONSTRUCTOR_P (decl) = 1;
7677 break;
7678 case sfk_destructor:
7679 DECL_DESTRUCTOR_P (decl) = 1;
7680 break;
7681 default:
7682 break;
7685 /* If pointers to member functions use the least significant bit to
7686 indicate whether a function is virtual, ensure a pointer
7687 to this function will have that bit clear. */
7688 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
7689 && TREE_CODE (type) == METHOD_TYPE
7690 && DECL_ALIGN (decl) < 2 * BITS_PER_UNIT)
7691 DECL_ALIGN (decl) = 2 * BITS_PER_UNIT;
7693 if (friendp
7694 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
7696 if (funcdef_flag)
7697 error
7698 ("defining explicit specialization %qD in friend declaration",
7699 orig_declarator);
7700 else
7702 tree fns = TREE_OPERAND (orig_declarator, 0);
7703 tree args = TREE_OPERAND (orig_declarator, 1);
7705 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
7707 /* Something like `template <class T> friend void f<T>()'. */
7708 error ("invalid use of template-id %qD in declaration "
7709 "of primary template",
7710 orig_declarator);
7711 return NULL_TREE;
7715 /* A friend declaration of the form friend void f<>(). Record
7716 the information in the TEMPLATE_ID_EXPR. */
7717 SET_DECL_IMPLICIT_INSTANTIATION (decl);
7719 gcc_assert (identifier_p (fns) || TREE_CODE (fns) == OVERLOAD);
7720 DECL_TEMPLATE_INFO (decl) = build_template_info (fns, args);
7722 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
7723 if (TREE_PURPOSE (t)
7724 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
7726 error ("default arguments are not allowed in declaration "
7727 "of friend template specialization %qD",
7728 decl);
7729 return NULL_TREE;
7732 if (inlinep & 1)
7733 error ("%<inline%> is not allowed in declaration of friend "
7734 "template specialization %qD",
7735 decl);
7736 if (inlinep & 2)
7737 error ("%<constexpr%> is not allowed in declaration of friend "
7738 "template specialization %qD",
7739 decl);
7740 if (inlinep)
7741 return NULL_TREE;
7745 /* If this decl has namespace scope, set that up. */
7746 if (in_namespace)
7747 set_decl_namespace (decl, in_namespace, friendp);
7748 else if (!ctype)
7749 DECL_CONTEXT (decl) = FROB_CONTEXT (current_decl_namespace ());
7751 /* `main' and builtins have implicit 'C' linkage. */
7752 if ((MAIN_NAME_P (declarator)
7753 || (IDENTIFIER_LENGTH (declarator) > 10
7754 && IDENTIFIER_POINTER (declarator)[0] == '_'
7755 && IDENTIFIER_POINTER (declarator)[1] == '_'
7756 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0)
7757 || (targetcm.cxx_implicit_extern_c
7758 && targetcm.cxx_implicit_extern_c(IDENTIFIER_POINTER (declarator))))
7759 && current_lang_name == lang_name_cplusplus
7760 && ctype == NULL_TREE
7761 && DECL_FILE_SCOPE_P (decl))
7762 SET_DECL_LANGUAGE (decl, lang_c);
7764 /* Should probably propagate const out from type to decl I bet (mrs). */
7765 if (staticp)
7767 DECL_STATIC_FUNCTION_P (decl) = 1;
7768 DECL_CONTEXT (decl) = ctype;
7771 if (ctype)
7773 DECL_CONTEXT (decl) = ctype;
7774 if (funcdef_flag)
7775 check_class_member_definition_namespace (decl);
7778 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7780 if (PROCESSING_REAL_TEMPLATE_DECL_P())
7781 error ("cannot declare %<::main%> to be a template");
7782 if (inlinep & 1)
7783 error ("cannot declare %<::main%> to be inline");
7784 if (inlinep & 2)
7785 error ("cannot declare %<::main%> to be constexpr");
7786 if (!publicp)
7787 error ("cannot declare %<::main%> to be static");
7788 inlinep = 0;
7789 publicp = 1;
7792 /* Members of anonymous types and local classes have no linkage; make
7793 them internal. If a typedef is made later, this will be changed. */
7794 if (ctype && (TYPE_ANONYMOUS_P (ctype)
7795 || decl_function_context (TYPE_MAIN_DECL (ctype))))
7796 publicp = 0;
7798 if (publicp && cxx_dialect == cxx98)
7800 /* [basic.link]: A name with no linkage (notably, the name of a class
7801 or enumeration declared in a local scope) shall not be used to
7802 declare an entity with linkage.
7804 DR 757 relaxes this restriction for C++0x. */
7805 no_linkage_error (decl);
7808 TREE_PUBLIC (decl) = publicp;
7809 if (! publicp)
7811 DECL_INTERFACE_KNOWN (decl) = 1;
7812 DECL_NOT_REALLY_EXTERN (decl) = 1;
7815 /* If the declaration was declared inline, mark it as such. */
7816 if (inlinep)
7818 DECL_DECLARED_INLINE_P (decl) = 1;
7819 if (publicp)
7820 DECL_COMDAT (decl) = 1;
7822 if (inlinep & 2)
7823 DECL_DECLARED_CONSTEXPR_P (decl) = true;
7825 DECL_EXTERNAL (decl) = 1;
7826 if (TREE_CODE (type) == FUNCTION_TYPE)
7828 if (quals)
7830 error (ctype
7831 ? G_("static member function %qD cannot have cv-qualifier")
7832 : G_("non-member function %qD cannot have cv-qualifier"),
7833 decl);
7834 quals = TYPE_UNQUALIFIED;
7837 if (rqual)
7839 error (ctype
7840 ? G_("static member function %qD cannot have ref-qualifier")
7841 : G_("non-member function %qD cannot have ref-qualifier"),
7842 decl);
7843 rqual = REF_QUAL_NONE;
7847 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
7848 && !grok_op_properties (decl, /*complain=*/true))
7849 return NULL_TREE;
7850 else if (UDLIT_OPER_P (DECL_NAME (decl)))
7852 bool long_long_unsigned_p;
7853 bool long_double_p;
7854 const char *suffix = NULL;
7855 /* [over.literal]/6: Literal operators shall not have C linkage. */
7856 if (DECL_LANGUAGE (decl) == lang_c)
7858 error ("literal operator with C linkage");
7859 return NULL_TREE;
7862 if (DECL_NAMESPACE_SCOPE_P (decl))
7864 if (!check_literal_operator_args (decl, &long_long_unsigned_p,
7865 &long_double_p))
7867 error ("%qD has invalid argument list", decl);
7868 return NULL_TREE;
7871 suffix = UDLIT_OP_SUFFIX (DECL_NAME (decl));
7872 if (long_long_unsigned_p)
7874 if (cpp_interpret_int_suffix (parse_in, suffix, strlen (suffix)))
7875 warning (0, "integer suffix %<%s%>"
7876 " shadowed by implementation", suffix);
7878 else if (long_double_p)
7880 if (cpp_interpret_float_suffix (parse_in, suffix, strlen (suffix)))
7881 warning (0, "floating point suffix %<%s%>"
7882 " shadowed by implementation", suffix);
7885 else
7887 error ("%qD must be a non-member function", decl);
7888 return NULL_TREE;
7892 if (funcdef_flag)
7893 /* Make the init_value nonzero so pushdecl knows this is not
7894 tentative. error_mark_node is replaced later with the BLOCK. */
7895 DECL_INITIAL (decl) = error_mark_node;
7897 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
7898 TREE_NOTHROW (decl) = 1;
7900 if (flag_openmp || flag_cilkplus)
7902 /* Adjust "omp declare simd" attributes. */
7903 tree ods = lookup_attribute ("omp declare simd", *attrlist);
7904 if (ods)
7906 tree attr;
7907 for (attr = ods; attr;
7908 attr = lookup_attribute ("omp declare simd", TREE_CHAIN (attr)))
7910 if (TREE_CODE (type) == METHOD_TYPE)
7911 walk_tree (&TREE_VALUE (attr), declare_simd_adjust_this,
7912 DECL_ARGUMENTS (decl), NULL);
7913 if (TREE_VALUE (attr) != NULL_TREE)
7915 tree cl = TREE_VALUE (TREE_VALUE (attr));
7916 cl = c_omp_declare_simd_clauses_to_numbers
7917 (DECL_ARGUMENTS (decl), cl);
7918 if (cl)
7919 TREE_VALUE (TREE_VALUE (attr)) = cl;
7920 else
7921 TREE_VALUE (attr) = NULL_TREE;
7927 /* Caller will do the rest of this. */
7928 if (check < 0)
7929 return decl;
7931 if (ctype != NULL_TREE)
7932 grokclassfn (ctype, decl, flags);
7934 /* 12.4/3 */
7935 if (cxx_dialect >= cxx11
7936 && DECL_DESTRUCTOR_P (decl)
7937 && !TYPE_BEING_DEFINED (DECL_CONTEXT (decl))
7938 && !processing_template_decl)
7939 deduce_noexcept_on_destructor (decl);
7941 decl = check_explicit_specialization (orig_declarator, decl,
7942 template_count,
7943 2 * funcdef_flag +
7944 4 * (friendp != 0));
7945 if (decl == error_mark_node)
7946 return NULL_TREE;
7948 if (DECL_STATIC_FUNCTION_P (decl))
7949 check_static_quals (decl, quals);
7951 if (attrlist)
7953 cplus_decl_attributes (&decl, *attrlist, 0);
7954 *attrlist = NULL_TREE;
7957 /* Check main's type after attributes have been applied. */
7958 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7960 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
7961 integer_type_node))
7963 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
7964 tree newtype;
7965 error ("%<::main%> must return %<int%>");
7966 newtype = build_function_type (integer_type_node, oldtypeargs);
7967 TREE_TYPE (decl) = newtype;
7969 if (warn_main)
7970 check_main_parameter_types (decl);
7973 if (ctype != NULL_TREE
7974 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
7975 && check)
7977 tree old_decl = check_classfn (ctype, decl,
7978 (processing_template_decl
7979 > template_class_depth (ctype))
7980 ? current_template_parms
7981 : NULL_TREE);
7983 if (old_decl == error_mark_node)
7984 return NULL_TREE;
7986 if (old_decl)
7988 tree ok;
7989 tree pushed_scope;
7991 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
7992 /* Because grokfndecl is always supposed to return a
7993 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
7994 here. We depend on our callers to figure out that its
7995 really a template that's being returned. */
7996 old_decl = DECL_TEMPLATE_RESULT (old_decl);
7998 if (DECL_STATIC_FUNCTION_P (old_decl)
7999 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
8001 /* Remove the `this' parm added by grokclassfn. */
8002 revert_static_member_fn (decl);
8003 check_static_quals (decl, quals);
8005 if (DECL_ARTIFICIAL (old_decl))
8007 error ("definition of implicitly-declared %qD", old_decl);
8008 return NULL_TREE;
8010 else if (DECL_DEFAULTED_FN (old_decl))
8012 error ("definition of explicitly-defaulted %q+D", decl);
8013 error ("%q+#D explicitly defaulted here", old_decl);
8014 return NULL_TREE;
8017 /* Since we've smashed OLD_DECL to its
8018 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
8019 if (TREE_CODE (decl) == TEMPLATE_DECL)
8020 decl = DECL_TEMPLATE_RESULT (decl);
8022 /* Attempt to merge the declarations. This can fail, in
8023 the case of some invalid specialization declarations. */
8024 pushed_scope = push_scope (ctype);
8025 ok = duplicate_decls (decl, old_decl, friendp);
8026 if (pushed_scope)
8027 pop_scope (pushed_scope);
8028 if (!ok)
8030 error ("no %q#D member function declared in class %qT",
8031 decl, ctype);
8032 return NULL_TREE;
8034 if (ok == error_mark_node)
8035 return NULL_TREE;
8036 return old_decl;
8040 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
8041 return NULL_TREE;
8043 if (ctype == NULL_TREE || check)
8044 return decl;
8046 if (virtualp)
8047 DECL_VIRTUAL_P (decl) = 1;
8049 return decl;
8052 /* decl is a FUNCTION_DECL.
8053 specifiers are the parsed virt-specifiers.
8055 Set flags to reflect the virt-specifiers.
8057 Returns decl. */
8059 static tree
8060 set_virt_specifiers (tree decl, cp_virt_specifiers specifiers)
8062 if (decl == NULL_TREE)
8063 return decl;
8064 if (specifiers & VIRT_SPEC_OVERRIDE)
8065 DECL_OVERRIDE_P (decl) = 1;
8066 if (specifiers & VIRT_SPEC_FINAL)
8067 DECL_FINAL_P (decl) = 1;
8068 return decl;
8071 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
8072 the linkage that DECL will receive in the object file. */
8074 static void
8075 set_linkage_for_static_data_member (tree decl)
8077 /* A static data member always has static storage duration and
8078 external linkage. Note that static data members are forbidden in
8079 local classes -- the only situation in which a class has
8080 non-external linkage. */
8081 TREE_PUBLIC (decl) = 1;
8082 TREE_STATIC (decl) = 1;
8083 /* For non-template classes, static data members are always put
8084 out in exactly those files where they are defined, just as
8085 with ordinary namespace-scope variables. */
8086 if (!processing_template_decl)
8087 DECL_INTERFACE_KNOWN (decl) = 1;
8090 /* Create a VAR_DECL named NAME with the indicated TYPE.
8092 If SCOPE is non-NULL, it is the class type or namespace containing
8093 the variable. If SCOPE is NULL, the variable should is created in
8094 the innermost enclosing scope. */
8096 static tree
8097 grokvardecl (tree type,
8098 tree name,
8099 tree orig_declarator,
8100 const cp_decl_specifier_seq *declspecs,
8101 int initialized,
8102 int constp,
8103 int template_count,
8104 tree scope)
8106 tree decl;
8107 tree explicit_scope;
8109 gcc_assert (!name || identifier_p (name));
8111 /* Compute the scope in which to place the variable, but remember
8112 whether or not that scope was explicitly specified by the user. */
8113 explicit_scope = scope;
8114 if (!scope)
8116 /* An explicit "extern" specifier indicates a namespace-scope
8117 variable. */
8118 if (declspecs->storage_class == sc_extern)
8119 scope = current_decl_namespace ();
8120 else if (!at_function_scope_p ())
8121 scope = current_scope ();
8124 if (scope
8125 && (/* If the variable is a namespace-scope variable declared in a
8126 template, we need DECL_LANG_SPECIFIC. */
8127 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
8128 /* Similarly for namespace-scope variables with language linkage
8129 other than C++. */
8130 || (TREE_CODE (scope) == NAMESPACE_DECL
8131 && current_lang_name != lang_name_cplusplus)
8132 /* Similarly for static data members. */
8133 || TYPE_P (scope)
8134 /* Similarly for explicit specializations. */
8135 || (orig_declarator
8136 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)))
8137 decl = build_lang_decl (VAR_DECL, name, type);
8138 else
8139 decl = build_decl (input_location, VAR_DECL, name, type);
8141 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
8142 set_decl_namespace (decl, explicit_scope, 0);
8143 else
8144 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
8146 if (declspecs->storage_class == sc_extern)
8148 DECL_THIS_EXTERN (decl) = 1;
8149 DECL_EXTERNAL (decl) = !initialized;
8152 if (DECL_CLASS_SCOPE_P (decl))
8154 set_linkage_for_static_data_member (decl);
8155 /* This function is only called with out-of-class definitions. */
8156 DECL_EXTERNAL (decl) = 0;
8157 check_class_member_definition_namespace (decl);
8159 /* At top level, either `static' or no s.c. makes a definition
8160 (perhaps tentative), and absence of `static' makes it public. */
8161 else if (toplevel_bindings_p ())
8163 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
8164 && (DECL_THIS_EXTERN (decl) || ! constp));
8165 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
8167 /* Not at top level, only `static' makes a static definition. */
8168 else
8170 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
8171 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
8174 if (decl_spec_seq_has_spec_p (declspecs, ds_thread))
8176 if (DECL_EXTERNAL (decl) || TREE_STATIC (decl))
8177 set_decl_tls_model (decl, decl_default_tls_model (decl));
8178 if (declspecs->gnu_thread_keyword_p)
8179 DECL_GNU_TLS_P (decl) = true;
8182 /* If the type of the decl has no linkage, make sure that we'll
8183 notice that in mark_used. */
8184 if (cxx_dialect > cxx98
8185 && decl_linkage (decl) != lk_none
8186 && DECL_LANG_SPECIFIC (decl) == NULL
8187 && !DECL_EXTERN_C_P (decl)
8188 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
8189 retrofit_lang_decl (decl);
8191 if (TREE_PUBLIC (decl))
8193 /* [basic.link]: A name with no linkage (notably, the name of a class
8194 or enumeration declared in a local scope) shall not be used to
8195 declare an entity with linkage.
8197 DR 757 relaxes this restriction for C++0x. */
8198 if (cxx_dialect < cxx11)
8199 no_linkage_error (decl);
8201 else
8202 DECL_INTERFACE_KNOWN (decl) = 1;
8204 // Handle explicit specializations and instantiations of variable templates.
8205 if (orig_declarator)
8206 decl = check_explicit_specialization (orig_declarator, decl,
8207 template_count, 0);
8209 return decl != error_mark_node ? decl : NULL_TREE;
8212 /* Create and return a canonical pointer to member function type, for
8213 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
8215 tree
8216 build_ptrmemfunc_type (tree type)
8218 tree field, fields;
8219 tree t;
8221 if (type == error_mark_node)
8222 return type;
8224 /* If a canonical type already exists for this type, use it. We use
8225 this method instead of type_hash_canon, because it only does a
8226 simple equality check on the list of field members. */
8228 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
8229 return t;
8231 /* Make sure that we always have the unqualified pointer-to-member
8232 type first. */
8233 if (cp_cv_quals quals = cp_type_quals (type))
8235 tree unqual = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
8236 return cp_build_qualified_type (unqual, quals);
8239 t = make_node (RECORD_TYPE);
8241 /* Let the front end know this is a pointer to member function. */
8242 TYPE_PTRMEMFUNC_FLAG (t) = 1;
8244 field = build_decl (input_location, FIELD_DECL, pfn_identifier, type);
8245 fields = field;
8247 field = build_decl (input_location, FIELD_DECL, delta_identifier,
8248 delta_type_node);
8249 DECL_CHAIN (field) = fields;
8250 fields = field;
8252 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
8254 /* Zap out the name so that the back end will give us the debugging
8255 information for this anonymous RECORD_TYPE. */
8256 TYPE_NAME (t) = NULL_TREE;
8258 /* Cache this pointer-to-member type so that we can find it again
8259 later. */
8260 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
8262 if (TYPE_STRUCTURAL_EQUALITY_P (type))
8263 SET_TYPE_STRUCTURAL_EQUALITY (t);
8264 else if (TYPE_CANONICAL (type) != type)
8265 TYPE_CANONICAL (t) = build_ptrmemfunc_type (TYPE_CANONICAL (type));
8267 return t;
8270 /* Create and return a pointer to data member type. */
8272 tree
8273 build_ptrmem_type (tree class_type, tree member_type)
8275 if (TREE_CODE (member_type) == METHOD_TYPE)
8277 cp_cv_quals quals = type_memfn_quals (member_type);
8278 cp_ref_qualifier rqual = type_memfn_rqual (member_type);
8279 member_type = build_memfn_type (member_type, class_type, quals, rqual);
8280 return build_ptrmemfunc_type (build_pointer_type (member_type));
8282 else
8284 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
8285 return build_offset_type (class_type, member_type);
8289 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
8290 Check to see that the definition is valid. Issue appropriate error
8291 messages. Return 1 if the definition is particularly bad, or 0
8292 otherwise. */
8294 static int
8295 check_static_variable_definition (tree decl, tree type)
8297 /* Can't check yet if we don't know the type. */
8298 if (dependent_type_p (type))
8299 return 0;
8300 /* If DECL is declared constexpr, we'll do the appropriate checks
8301 in check_initializer. */
8302 if (DECL_P (decl) && DECL_DECLARED_CONSTEXPR_P (decl))
8303 return 0;
8304 else if (cxx_dialect >= cxx11 && !INTEGRAL_OR_ENUMERATION_TYPE_P (type))
8306 if (!COMPLETE_TYPE_P (type))
8307 error ("in-class initialization of static data member %q#D of "
8308 "incomplete type", decl);
8309 else if (literal_type_p (type))
8310 permerror (input_location,
8311 "%<constexpr%> needed for in-class initialization of "
8312 "static data member %q#D of non-integral type", decl);
8313 else
8314 error ("in-class initialization of static data member %q#D of "
8315 "non-literal type", decl);
8316 return 1;
8319 /* Motion 10 at San Diego: If a static const integral data member is
8320 initialized with an integral constant expression, the initializer
8321 may appear either in the declaration (within the class), or in
8322 the definition, but not both. If it appears in the class, the
8323 member is a member constant. The file-scope definition is always
8324 required. */
8325 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
8327 error ("invalid in-class initialization of static data member "
8328 "of non-integral type %qT",
8329 type);
8330 return 1;
8332 else if (!CP_TYPE_CONST_P (type))
8333 error ("ISO C++ forbids in-class initialization of non-const "
8334 "static member %qD",
8335 decl);
8336 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type))
8337 pedwarn (input_location, OPT_Wpedantic, "ISO C++ forbids initialization of member constant "
8338 "%qD of non-integral type %qT", decl, type);
8340 return 0;
8343 /* *expr_p is part of the TYPE_SIZE of a variably-sized array. If any
8344 SAVE_EXPRs in *expr_p wrap expressions with side-effects, break those
8345 expressions out into temporary variables so that walk_tree doesn't
8346 step into them (c++/15764). */
8348 static tree
8349 stabilize_save_expr_r (tree *expr_p, int *walk_subtrees, void *data)
8351 hash_set<tree> *pset = (hash_set<tree> *)data;
8352 tree expr = *expr_p;
8353 if (TREE_CODE (expr) == SAVE_EXPR)
8355 tree op = TREE_OPERAND (expr, 0);
8356 cp_walk_tree (&op, stabilize_save_expr_r, data, pset);
8357 if (TREE_SIDE_EFFECTS (op))
8358 TREE_OPERAND (expr, 0) = get_temp_regvar (TREE_TYPE (op), op);
8359 *walk_subtrees = 0;
8361 else if (!EXPR_P (expr) || !TREE_SIDE_EFFECTS (expr))
8362 *walk_subtrees = 0;
8363 return NULL;
8366 /* Entry point for the above. */
8368 static void
8369 stabilize_vla_size (tree size)
8371 hash_set<tree> pset;
8372 /* Break out any function calls into temporary variables. */
8373 cp_walk_tree (&size, stabilize_save_expr_r, &pset, &pset);
8376 /* Helper function for compute_array_index_type. Look for SIZEOF_EXPR
8377 not inside of SAVE_EXPR and fold them. */
8379 static tree
8380 fold_sizeof_expr_r (tree *expr_p, int *walk_subtrees, void *data)
8382 tree expr = *expr_p;
8383 if (TREE_CODE (expr) == SAVE_EXPR || TYPE_P (expr))
8384 *walk_subtrees = 0;
8385 else if (TREE_CODE (expr) == SIZEOF_EXPR)
8387 *(bool *)data = true;
8388 if (SIZEOF_EXPR_TYPE_P (expr))
8389 expr = cxx_sizeof_or_alignof_type (TREE_TYPE (TREE_OPERAND (expr, 0)),
8390 SIZEOF_EXPR, false);
8391 else if (TYPE_P (TREE_OPERAND (expr, 0)))
8392 expr = cxx_sizeof_or_alignof_type (TREE_OPERAND (expr, 0), SIZEOF_EXPR,
8393 false);
8394 else
8395 expr = cxx_sizeof_or_alignof_expr (TREE_OPERAND (expr, 0), SIZEOF_EXPR,
8396 false);
8397 if (expr == error_mark_node)
8398 expr = size_one_node;
8399 *expr_p = expr;
8400 *walk_subtrees = 0;
8402 return NULL;
8405 /* Given the SIZE (i.e., number of elements) in an array, compute an
8406 appropriate index type for the array. If non-NULL, NAME is the
8407 name of the thing being declared. */
8409 tree
8410 compute_array_index_type (tree name, tree size, tsubst_flags_t complain)
8412 tree itype;
8413 tree osize = size;
8415 if (error_operand_p (size))
8416 return error_mark_node;
8418 if (!type_dependent_expression_p (size))
8420 tree type = TREE_TYPE (size);
8422 mark_rvalue_use (size);
8424 if (cxx_dialect < cxx11 && TREE_CODE (size) == NOP_EXPR
8425 && TREE_SIDE_EFFECTS (size))
8426 /* In C++98, we mark a non-constant array bound with a magic
8427 NOP_EXPR with TREE_SIDE_EFFECTS; don't fold in that case. */;
8428 else
8430 size = instantiate_non_dependent_expr_sfinae (size, complain);
8432 if (CLASS_TYPE_P (type)
8433 && CLASSTYPE_LITERAL_P (type))
8435 size = build_expr_type_conversion (WANT_INT, size, true);
8436 if (!size)
8438 if (!(complain & tf_error))
8439 return error_mark_node;
8440 if (name)
8441 error ("size of array %qD has non-integral type %qT",
8442 name, type);
8443 else
8444 error ("size of array has non-integral type %qT", type);
8445 size = integer_one_node;
8447 if (size == error_mark_node)
8448 return error_mark_node;
8449 type = TREE_TYPE (size);
8452 if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
8453 size = maybe_constant_value (size);
8455 if (!TREE_CONSTANT (size))
8456 size = osize;
8459 if (error_operand_p (size))
8460 return error_mark_node;
8462 /* The array bound must be an integer type. */
8463 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
8465 if (!(complain & tf_error))
8466 return error_mark_node;
8467 if (name)
8468 error ("size of array %qD has non-integral type %qT", name, type);
8469 else
8470 error ("size of array has non-integral type %qT", type);
8471 size = integer_one_node;
8472 type = TREE_TYPE (size);
8476 /* A type is dependent if it is...an array type constructed from any
8477 dependent type or whose size is specified by a constant expression
8478 that is value-dependent. */
8479 /* We can only call value_dependent_expression_p on integral constant
8480 expressions; treat non-constant expressions as dependent, too. */
8481 if (processing_template_decl
8482 && (type_dependent_expression_p (size)
8483 || !TREE_CONSTANT (size) || value_dependent_expression_p (size)))
8485 /* We cannot do any checking for a SIZE that isn't known to be
8486 constant. Just build the index type and mark that it requires
8487 structural equality checks. */
8488 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
8489 size, size_one_node));
8490 TYPE_DEPENDENT_P (itype) = 1;
8491 TYPE_DEPENDENT_P_VALID (itype) = 1;
8492 SET_TYPE_STRUCTURAL_EQUALITY (itype);
8493 return itype;
8496 /* Normally, the array-bound will be a constant. */
8497 if (TREE_CODE (size) == INTEGER_CST)
8499 /* Check to see if the array bound overflowed. Make that an
8500 error, no matter how generous we're being. */
8501 constant_expression_error (size);
8503 /* An array must have a positive number of elements. */
8504 if (tree_int_cst_lt (size, integer_zero_node))
8506 if (!(complain & tf_error))
8507 return error_mark_node;
8508 if (name)
8509 error ("size of array %qD is negative", name);
8510 else
8511 error ("size of array is negative");
8512 size = integer_one_node;
8514 /* As an extension we allow zero-sized arrays. */
8515 else if (integer_zerop (size))
8517 if (!(complain & tf_error))
8518 /* We must fail if performing argument deduction (as
8519 indicated by the state of complain), so that
8520 another substitution can be found. */
8521 return error_mark_node;
8522 else if (in_system_header_at (input_location))
8523 /* Allow them in system headers because glibc uses them. */;
8524 else if (name)
8525 pedwarn (input_location, OPT_Wpedantic, "ISO C++ forbids zero-size array %qD", name);
8526 else
8527 pedwarn (input_location, OPT_Wpedantic, "ISO C++ forbids zero-size array");
8530 else if (TREE_CONSTANT (size)
8531 /* We don't allow VLAs at non-function scopes, or during
8532 tentative template substitution. */
8533 || !at_function_scope_p ()
8534 || !(complain & tf_error))
8536 if (!(complain & tf_error))
8537 return error_mark_node;
8538 /* `(int) &fn' is not a valid array bound. */
8539 if (name)
8540 error ("size of array %qD is not an integral constant-expression",
8541 name);
8542 else
8543 error ("size of array is not an integral constant-expression");
8544 size = integer_one_node;
8546 else if (pedantic && warn_vla != 0)
8548 if (name)
8549 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array %qD", name);
8550 else
8551 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array");
8553 else if (warn_vla > 0)
8555 if (name)
8556 warning (OPT_Wvla,
8557 "variable length array %qD is used", name);
8558 else
8559 warning (OPT_Wvla,
8560 "variable length array is used");
8563 if (processing_template_decl && !TREE_CONSTANT (size))
8564 /* A variable sized array. */
8565 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
8566 else
8568 HOST_WIDE_INT saved_processing_template_decl;
8570 /* Compute the index of the largest element in the array. It is
8571 one less than the number of elements in the array. We save
8572 and restore PROCESSING_TEMPLATE_DECL so that computations in
8573 cp_build_binary_op will be appropriately folded. */
8574 saved_processing_template_decl = processing_template_decl;
8575 processing_template_decl = 0;
8576 itype = cp_build_binary_op (input_location,
8577 MINUS_EXPR,
8578 cp_convert (ssizetype, size, complain),
8579 cp_convert (ssizetype, integer_one_node,
8580 complain),
8581 complain);
8582 itype = fold (itype);
8583 processing_template_decl = saved_processing_template_decl;
8585 if (!TREE_CONSTANT (itype))
8587 /* A variable sized array. */
8588 itype = variable_size (itype);
8590 if (TREE_CODE (itype) != SAVE_EXPR)
8592 /* Look for SIZEOF_EXPRs in itype and fold them, otherwise
8593 they might survive till gimplification. */
8594 tree newitype = itype;
8595 bool found = false;
8596 cp_walk_tree_without_duplicates (&newitype,
8597 fold_sizeof_expr_r, &found);
8598 if (found)
8599 itype = variable_size (fold (newitype));
8602 stabilize_vla_size (itype);
8604 if (flag_sanitize & SANITIZE_VLA
8605 && current_function_decl != NULL_TREE
8606 && !lookup_attribute ("no_sanitize_undefined",
8607 DECL_ATTRIBUTES
8608 (current_function_decl)))
8610 /* We have to add 1 -- in the ubsan routine we generate
8611 LE_EXPR rather than LT_EXPR. */
8612 tree t = fold_build2 (PLUS_EXPR, TREE_TYPE (itype), itype,
8613 build_one_cst (TREE_TYPE (itype)));
8614 t = ubsan_instrument_vla (input_location, t);
8615 finish_expr_stmt (t);
8618 /* Make sure that there was no overflow when creating to a signed
8619 index type. (For example, on a 32-bit machine, an array with
8620 size 2^32 - 1 is too big.) */
8621 else if (TREE_CODE (itype) == INTEGER_CST
8622 && TREE_OVERFLOW (itype))
8624 if (!(complain & tf_error))
8625 return error_mark_node;
8626 error ("overflow in array dimension");
8627 TREE_OVERFLOW (itype) = 0;
8631 /* Create and return the appropriate index type. */
8632 itype = build_index_type (itype);
8634 /* If the index type were dependent, we would have returned early, so
8635 remember that it isn't. */
8636 TYPE_DEPENDENT_P (itype) = 0;
8637 TYPE_DEPENDENT_P_VALID (itype) = 1;
8638 return itype;
8641 /* Returns the scope (if any) in which the entity declared by
8642 DECLARATOR will be located. If the entity was declared with an
8643 unqualified name, NULL_TREE is returned. */
8645 tree
8646 get_scope_of_declarator (const cp_declarator *declarator)
8648 while (declarator && declarator->kind != cdk_id)
8649 declarator = declarator->declarator;
8651 /* If the declarator-id is a SCOPE_REF, the scope in which the
8652 declaration occurs is the first operand. */
8653 if (declarator
8654 && declarator->u.id.qualifying_scope)
8655 return declarator->u.id.qualifying_scope;
8657 /* Otherwise, the declarator is not a qualified name; the entity will
8658 be declared in the current scope. */
8659 return NULL_TREE;
8662 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
8663 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
8664 with this type. */
8666 static tree
8667 create_array_type_for_decl (tree name, tree type, tree size)
8669 tree itype = NULL_TREE;
8671 /* If things have already gone awry, bail now. */
8672 if (type == error_mark_node || size == error_mark_node)
8673 return error_mark_node;
8675 /* 8.3.4/1: If the type of the identifier of D contains the auto
8676 type-specifier, the program is ill-formed. */
8677 if (type_uses_auto (type))
8679 error ("%qD declared as array of %qT", name, type);
8680 return error_mark_node;
8683 /* If there are some types which cannot be array elements,
8684 issue an error-message and return. */
8685 switch (TREE_CODE (type))
8687 case VOID_TYPE:
8688 if (name)
8689 error ("declaration of %qD as array of void", name);
8690 else
8691 error ("creating array of void");
8692 return error_mark_node;
8694 case FUNCTION_TYPE:
8695 if (name)
8696 error ("declaration of %qD as array of functions", name);
8697 else
8698 error ("creating array of functions");
8699 return error_mark_node;
8701 case REFERENCE_TYPE:
8702 if (name)
8703 error ("declaration of %qD as array of references", name);
8704 else
8705 error ("creating array of references");
8706 return error_mark_node;
8708 case METHOD_TYPE:
8709 if (name)
8710 error ("declaration of %qD as array of function members", name);
8711 else
8712 error ("creating array of function members");
8713 return error_mark_node;
8715 default:
8716 break;
8719 /* [dcl.array]
8721 The constant expressions that specify the bounds of the arrays
8722 can be omitted only for the first member of the sequence. */
8723 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
8725 if (name)
8726 error ("declaration of %qD as multidimensional array must "
8727 "have bounds for all dimensions except the first",
8728 name);
8729 else
8730 error ("multidimensional array must have bounds for all "
8731 "dimensions except the first");
8733 return error_mark_node;
8736 /* Figure out the index type for the array. */
8737 if (size)
8738 itype = compute_array_index_type (name, size, tf_warning_or_error);
8740 /* [dcl.array]
8741 T is called the array element type; this type shall not be [...] an
8742 abstract class type. */
8743 abstract_virtuals_error (name, type);
8745 return build_cplus_array_type (type, itype);
8748 /* Check that it's OK to declare a function with the indicated TYPE.
8749 SFK indicates the kind of special function (if any) that this
8750 function is. OPTYPE is the type given in a conversion operator
8751 declaration, or the class type for a constructor/destructor.
8752 Returns the actual return type of the function; that
8753 may be different than TYPE if an error occurs, or for certain
8754 special functions. */
8756 static tree
8757 check_special_function_return_type (special_function_kind sfk,
8758 tree type,
8759 tree optype)
8761 switch (sfk)
8763 case sfk_constructor:
8764 if (type)
8765 error ("return type specification for constructor invalid");
8767 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
8768 type = build_pointer_type (optype);
8769 else
8770 type = void_type_node;
8771 break;
8773 case sfk_destructor:
8774 if (type)
8775 error ("return type specification for destructor invalid");
8776 /* We can't use the proper return type here because we run into
8777 problems with ambiguous bases and covariant returns.
8778 Java classes are left unchanged because (void *) isn't a valid
8779 Java type, and we don't want to change the Java ABI. */
8780 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
8781 type = build_pointer_type (void_type_node);
8782 else
8783 type = void_type_node;
8784 break;
8786 case sfk_conversion:
8787 if (type)
8788 error ("return type specified for %<operator %T%>", optype);
8789 type = optype;
8790 break;
8792 default:
8793 gcc_unreachable ();
8796 return type;
8799 /* A variable or data member (whose unqualified name is IDENTIFIER)
8800 has been declared with the indicated TYPE. If the TYPE is not
8801 acceptable, issue an error message and return a type to use for
8802 error-recovery purposes. */
8804 tree
8805 check_var_type (tree identifier, tree type)
8807 if (VOID_TYPE_P (type))
8809 if (!identifier)
8810 error ("unnamed variable or field declared void");
8811 else if (identifier_p (identifier))
8813 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
8814 error ("variable or field %qE declared void", identifier);
8816 else
8817 error ("variable or field declared void");
8818 type = error_mark_node;
8821 return type;
8824 /* Given declspecs and a declarator (abstract or otherwise), determine
8825 the name and type of the object declared and construct a DECL node
8826 for it.
8828 DECLSPECS points to the representation of declaration-specifier
8829 sequence that precedes declarator.
8831 DECL_CONTEXT says which syntactic context this declaration is in:
8832 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
8833 FUNCDEF for a function definition. Like NORMAL but a few different
8834 error messages in each case. Return value may be zero meaning
8835 this definition is too screwy to try to parse.
8836 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
8837 handle member functions (which have FIELD context).
8838 Return value may be zero meaning this definition is too screwy to
8839 try to parse.
8840 PARM for a parameter declaration (either within a function prototype
8841 or before a function body). Make a PARM_DECL, or return void_type_node.
8842 TPARM for a template parameter declaration.
8843 CATCHPARM for a parameter declaration before a catch clause.
8844 TYPENAME if for a typename (in a cast or sizeof).
8845 Don't make a DECL node; just return the ..._TYPE node.
8846 FIELD for a struct or union field; make a FIELD_DECL.
8847 BITFIELD for a field with specified width.
8849 INITIALIZED is as for start_decl.
8851 ATTRLIST is a pointer to the list of attributes, which may be NULL
8852 if there are none; *ATTRLIST may be modified if attributes from inside
8853 the declarator should be applied to the declaration.
8855 When this function is called, scoping variables (such as
8856 CURRENT_CLASS_TYPE) should reflect the scope in which the
8857 declaration occurs, not the scope in which the new declaration will
8858 be placed. For example, on:
8860 void S::f() { ... }
8862 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
8863 should not be `S'.
8865 Returns a DECL (if a declarator is present), a TYPE (if there is no
8866 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
8867 error occurs. */
8869 tree
8870 grokdeclarator (const cp_declarator *declarator,
8871 cp_decl_specifier_seq *declspecs,
8872 enum decl_context decl_context,
8873 int initialized,
8874 tree* attrlist)
8876 tree type = NULL_TREE;
8877 int longlong = 0;
8878 int explicit_intN = 0;
8879 int virtualp, explicitp, friendp, inlinep, staticp;
8880 int explicit_int = 0;
8881 int explicit_char = 0;
8882 int defaulted_int = 0;
8884 tree typedef_decl = NULL_TREE;
8885 const char *name = NULL;
8886 tree typedef_type = NULL_TREE;
8887 /* True if this declarator is a function definition. */
8888 bool funcdef_flag = false;
8889 cp_declarator_kind innermost_code = cdk_error;
8890 int bitfield = 0;
8891 #if 0
8892 /* See the code below that used this. */
8893 tree decl_attr = NULL_TREE;
8894 #endif
8896 /* Keep track of what sort of function is being processed
8897 so that we can warn about default return values, or explicit
8898 return values which do not match prescribed defaults. */
8899 special_function_kind sfk = sfk_none;
8901 tree dname = NULL_TREE;
8902 tree ctor_return_type = NULL_TREE;
8903 enum overload_flags flags = NO_SPECIAL;
8904 /* cv-qualifiers that apply to the declarator, for a declaration of
8905 a member function. */
8906 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
8907 /* virt-specifiers that apply to the declarator, for a declaration of
8908 a member function. */
8909 cp_virt_specifiers virt_specifiers = VIRT_SPEC_UNSPECIFIED;
8910 /* ref-qualifier that applies to the declarator, for a declaration of
8911 a member function. */
8912 cp_ref_qualifier rqual = REF_QUAL_NONE;
8913 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
8914 int type_quals;
8915 tree raises = NULL_TREE;
8916 int template_count = 0;
8917 tree returned_attrs = NULL_TREE;
8918 tree parms = NULL_TREE;
8919 const cp_declarator *id_declarator;
8920 /* The unqualified name of the declarator; either an
8921 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
8922 tree unqualified_id;
8923 /* The class type, if any, in which this entity is located,
8924 or NULL_TREE if none. Note that this value may be different from
8925 the current class type; for example if an attempt is made to declare
8926 "A::f" inside "B", this value will be "A". */
8927 tree ctype = current_class_type;
8928 /* The NAMESPACE_DECL for the namespace in which this entity is
8929 located. If an unqualified name is used to declare the entity,
8930 this value will be NULL_TREE, even if the entity is located at
8931 namespace scope. */
8932 tree in_namespace = NULL_TREE;
8933 cp_storage_class storage_class;
8934 bool unsigned_p, signed_p, short_p, long_p, thread_p;
8935 bool type_was_error_mark_node = false;
8936 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
8937 bool template_type_arg = false;
8938 bool template_parm_flag = false;
8939 bool typedef_p = decl_spec_seq_has_spec_p (declspecs, ds_typedef);
8940 bool constexpr_p = decl_spec_seq_has_spec_p (declspecs, ds_constexpr);
8941 bool late_return_type_p = false;
8942 bool array_parameter_p = false;
8943 source_location saved_loc = input_location;
8944 const char *errmsg;
8946 signed_p = decl_spec_seq_has_spec_p (declspecs, ds_signed);
8947 unsigned_p = decl_spec_seq_has_spec_p (declspecs, ds_unsigned);
8948 short_p = decl_spec_seq_has_spec_p (declspecs, ds_short);
8949 long_p = decl_spec_seq_has_spec_p (declspecs, ds_long);
8950 longlong = decl_spec_seq_has_spec_p (declspecs, ds_long_long);
8951 explicit_intN = declspecs->explicit_intN_p;
8952 thread_p = decl_spec_seq_has_spec_p (declspecs, ds_thread);
8954 if (decl_context == FUNCDEF)
8955 funcdef_flag = true, decl_context = NORMAL;
8956 else if (decl_context == MEMFUNCDEF)
8957 funcdef_flag = true, decl_context = FIELD;
8958 else if (decl_context == BITFIELD)
8959 bitfield = 1, decl_context = FIELD;
8960 else if (decl_context == TEMPLATE_TYPE_ARG)
8961 template_type_arg = true, decl_context = TYPENAME;
8962 else if (decl_context == TPARM)
8963 template_parm_flag = true, decl_context = PARM;
8965 if (initialized > 1)
8966 funcdef_flag = true;
8968 /* Look inside a declarator for the name being declared
8969 and get it as a string, for an error message. */
8970 for (id_declarator = declarator;
8971 id_declarator;
8972 id_declarator = id_declarator->declarator)
8974 if (id_declarator->kind != cdk_id)
8975 innermost_code = id_declarator->kind;
8977 switch (id_declarator->kind)
8979 case cdk_function:
8980 if (id_declarator->declarator
8981 && id_declarator->declarator->kind == cdk_id)
8983 sfk = id_declarator->declarator->u.id.sfk;
8984 if (sfk == sfk_destructor)
8985 flags = DTOR_FLAG;
8987 break;
8989 case cdk_id:
8991 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
8992 tree decl = id_declarator->u.id.unqualified_name;
8993 if (!decl)
8994 break;
8995 if (qualifying_scope)
8997 if (at_function_scope_p ())
8999 /* [dcl.meaning]
9001 A declarator-id shall not be qualified except
9002 for ...
9004 None of the cases are permitted in block
9005 scope. */
9006 if (qualifying_scope == global_namespace)
9007 error ("invalid use of qualified-name %<::%D%>",
9008 decl);
9009 else if (TYPE_P (qualifying_scope))
9010 error ("invalid use of qualified-name %<%T::%D%>",
9011 qualifying_scope, decl);
9012 else
9013 error ("invalid use of qualified-name %<%D::%D%>",
9014 qualifying_scope, decl);
9015 return error_mark_node;
9017 else if (TYPE_P (qualifying_scope))
9019 ctype = qualifying_scope;
9020 if (!MAYBE_CLASS_TYPE_P (ctype))
9022 error ("%q#T is not a class or a namespace", ctype);
9023 ctype = NULL_TREE;
9025 else if (innermost_code != cdk_function
9026 && current_class_type
9027 && !uniquely_derived_from_p (ctype,
9028 current_class_type))
9030 error ("invalid use of qualified-name %<%T::%D%>",
9031 qualifying_scope, decl);
9032 return error_mark_node;
9035 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
9036 in_namespace = qualifying_scope;
9038 switch (TREE_CODE (decl))
9040 case BIT_NOT_EXPR:
9042 tree type;
9044 if (innermost_code != cdk_function)
9046 error ("declaration of %qD as non-function", decl);
9047 return error_mark_node;
9049 else if (!qualifying_scope
9050 && !(current_class_type && at_class_scope_p ()))
9052 error ("declaration of %qD as non-member", decl);
9053 return error_mark_node;
9056 type = TREE_OPERAND (decl, 0);
9057 if (TYPE_P (type))
9058 type = constructor_name (type);
9059 name = identifier_to_locale (IDENTIFIER_POINTER (type));
9060 dname = decl;
9062 break;
9064 case TEMPLATE_ID_EXPR:
9066 tree fns = TREE_OPERAND (decl, 0);
9068 dname = fns;
9069 if (!identifier_p (dname))
9071 if (variable_template_p (dname))
9072 dname = DECL_NAME (dname);
9073 else
9075 gcc_assert (is_overloaded_fn (dname));
9076 dname = DECL_NAME (get_first_fn (dname));
9080 /* Fall through. */
9082 case IDENTIFIER_NODE:
9083 if (identifier_p (decl))
9084 dname = decl;
9086 if (C_IS_RESERVED_WORD (dname))
9088 error ("declarator-id missing; using reserved word %qD",
9089 dname);
9090 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
9092 else if (!IDENTIFIER_TYPENAME_P (dname))
9093 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
9094 else
9096 gcc_assert (flags == NO_SPECIAL);
9097 flags = TYPENAME_FLAG;
9098 ctor_return_type = TREE_TYPE (dname);
9099 sfk = sfk_conversion;
9100 if (is_typename_at_global_scope (dname))
9101 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
9102 else
9103 name = "<invalid operator>";
9105 break;
9107 default:
9108 gcc_unreachable ();
9110 break;
9113 case cdk_array:
9114 case cdk_pointer:
9115 case cdk_reference:
9116 case cdk_ptrmem:
9117 break;
9119 case cdk_error:
9120 return error_mark_node;
9122 default:
9123 gcc_unreachable ();
9125 if (id_declarator->kind == cdk_id)
9126 break;
9129 /* [dcl.fct.edf]
9131 The declarator in a function-definition shall have the form
9132 D1 ( parameter-declaration-clause) ... */
9133 if (funcdef_flag && innermost_code != cdk_function)
9135 error ("function definition does not declare parameters");
9136 return error_mark_node;
9139 if (flags == TYPENAME_FLAG
9140 && innermost_code != cdk_function
9141 && ! (ctype && !declspecs->any_specifiers_p))
9143 error ("declaration of %qD as non-function", dname);
9144 return error_mark_node;
9147 if (dname
9148 && identifier_p (dname)
9149 && UDLIT_OPER_P (dname)
9150 && innermost_code != cdk_function)
9152 error ("declaration of %qD as non-function", dname);
9153 return error_mark_node;
9156 if (dname && IDENTIFIER_OPNAME_P (dname))
9158 if (typedef_p)
9160 error ("declaration of %qD as %<typedef%>", dname);
9161 return error_mark_node;
9163 else if (decl_context == PARM || decl_context == CATCHPARM)
9165 error ("declaration of %qD as parameter", dname);
9166 return error_mark_node;
9170 /* Anything declared one level down from the top level
9171 must be one of the parameters of a function
9172 (because the body is at least two levels down). */
9174 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
9175 by not allowing C++ class definitions to specify their parameters
9176 with xdecls (must be spec.d in the parmlist).
9178 Since we now wait to push a class scope until we are sure that
9179 we are in a legitimate method context, we must set oldcname
9180 explicitly (since current_class_name is not yet alive).
9182 We also want to avoid calling this a PARM if it is in a namespace. */
9184 if (decl_context == NORMAL && !toplevel_bindings_p ())
9186 cp_binding_level *b = current_binding_level;
9187 current_binding_level = b->level_chain;
9188 if (current_binding_level != 0 && toplevel_bindings_p ())
9189 decl_context = PARM;
9190 current_binding_level = b;
9193 if (name == NULL)
9194 name = decl_context == PARM ? "parameter" : "type name";
9196 if (constexpr_p && typedef_p)
9198 error ("%<constexpr%> cannot appear in a typedef declaration");
9199 return error_mark_node;
9202 /* If there were multiple types specified in the decl-specifier-seq,
9203 issue an error message. */
9204 if (declspecs->multiple_types_p)
9206 error ("two or more data types in declaration of %qs", name);
9207 return error_mark_node;
9210 if (declspecs->conflicting_specifiers_p)
9212 error ("conflicting specifiers in declaration of %qs", name);
9213 return error_mark_node;
9216 /* Extract the basic type from the decl-specifier-seq. */
9217 type = declspecs->type;
9218 if (type == error_mark_node)
9220 type = NULL_TREE;
9221 type_was_error_mark_node = true;
9223 /* If the entire declaration is itself tagged as deprecated then
9224 suppress reports of deprecated items. */
9225 if (type && TREE_DEPRECATED (type)
9226 && deprecated_state != DEPRECATED_SUPPRESS)
9227 warn_deprecated_use (type, NULL_TREE);
9228 if (type && TREE_CODE (type) == TYPE_DECL)
9230 typedef_decl = type;
9231 type = TREE_TYPE (typedef_decl);
9232 if (TREE_DEPRECATED (type)
9233 && DECL_ARTIFICIAL (typedef_decl)
9234 && deprecated_state != DEPRECATED_SUPPRESS)
9235 warn_deprecated_use (type, NULL_TREE);
9237 /* No type at all: default to `int', and set DEFAULTED_INT
9238 because it was not a user-defined typedef. */
9239 if (type == NULL_TREE)
9241 if (signed_p || unsigned_p || long_p || short_p)
9243 /* These imply 'int'. */
9244 type = integer_type_node;
9245 defaulted_int = 1;
9247 /* If we just have "complex", it is equivalent to "complex double". */
9248 else if (!longlong && !explicit_intN
9249 && decl_spec_seq_has_spec_p (declspecs, ds_complex))
9251 type = double_type_node;
9252 pedwarn (declspecs->locations[ds_complex], OPT_Wpedantic,
9253 "ISO C++ does not support plain %<complex%> meaning "
9254 "%<double complex%>");
9257 /* Gather flags. */
9258 explicit_int = declspecs->explicit_int_p;
9259 explicit_char = declspecs->explicit_char_p;
9261 #if 0
9262 /* See the code below that used this. */
9263 if (typedef_decl)
9264 decl_attr = DECL_ATTRIBUTES (typedef_decl);
9265 #endif
9266 typedef_type = type;
9269 if (sfk != sfk_conversion)
9270 ctor_return_type = ctype;
9272 if (sfk != sfk_none)
9273 type = check_special_function_return_type (sfk, type,
9274 ctor_return_type);
9275 else if (type == NULL_TREE)
9277 int is_main;
9279 explicit_int = -1;
9281 /* We handle `main' specially here, because 'main () { }' is so
9282 common. With no options, it is allowed. With -Wreturn-type,
9283 it is a warning. It is only an error with -pedantic-errors. */
9284 is_main = (funcdef_flag
9285 && dname && identifier_p (dname)
9286 && MAIN_NAME_P (dname)
9287 && ctype == NULL_TREE
9288 && in_namespace == NULL_TREE
9289 && current_namespace == global_namespace);
9291 if (type_was_error_mark_node)
9292 /* We've already issued an error, don't complain more. */;
9293 else if (in_system_header_at (input_location) || flag_ms_extensions)
9294 /* Allow it, sigh. */;
9295 else if (! is_main)
9296 permerror (input_location, "ISO C++ forbids declaration of %qs with no type", name);
9297 else if (pedantic)
9298 pedwarn (input_location, OPT_Wpedantic,
9299 "ISO C++ forbids declaration of %qs with no type", name);
9300 else
9301 warning (OPT_Wreturn_type,
9302 "ISO C++ forbids declaration of %qs with no type", name);
9304 type = integer_type_node;
9307 ctype = NULL_TREE;
9309 if (explicit_intN)
9311 if (! int_n_enabled_p[declspecs->int_n_idx])
9313 error ("%<__int%d%> is not supported by this target",
9314 int_n_data[declspecs->int_n_idx].bitsize);
9315 explicit_intN = false;
9317 else if (pedantic && ! in_system_header_at (input_location))
9318 pedwarn (input_location, OPT_Wpedantic,
9319 "ISO C++ does not support %<__int%d%> for %qs",
9320 int_n_data[declspecs->int_n_idx].bitsize, name);
9323 /* Now process the modifiers that were specified
9324 and check for invalid combinations. */
9326 /* Long double is a special combination. */
9327 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
9329 long_p = false;
9330 type = cp_build_qualified_type (long_double_type_node,
9331 cp_type_quals (type));
9334 /* Check all other uses of type modifiers. */
9336 if (unsigned_p || signed_p || long_p || short_p)
9338 int ok = 0;
9340 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
9341 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
9342 else if (signed_p && unsigned_p)
9343 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
9344 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
9345 error ("%<long long%> invalid for %qs", name);
9346 else if (long_p && TREE_CODE (type) == REAL_TYPE)
9347 error ("%<long%> invalid for %qs", name);
9348 else if (short_p && TREE_CODE (type) == REAL_TYPE)
9349 error ("%<short%> invalid for %qs", name);
9350 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
9351 error ("%<long%> or %<short%> invalid for %qs", name);
9352 else if ((long_p || short_p || explicit_char || explicit_int) && explicit_intN)
9353 error ("%<long%>, %<int%>, %<short%>, or %<char%> invalid for %qs", name);
9354 else if ((long_p || short_p) && explicit_char)
9355 error ("%<long%> or %<short%> specified with char for %qs", name);
9356 else if (long_p && short_p)
9357 error ("%<long%> and %<short%> specified together for %qs", name);
9358 else if (type == char16_type_node || type == char32_type_node)
9360 if (signed_p || unsigned_p)
9361 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
9362 else if (short_p || long_p)
9363 error ("%<short%> or %<long%> invalid for %qs", name);
9365 else
9367 ok = 1;
9368 if (!explicit_int && !defaulted_int && !explicit_char && !explicit_intN && pedantic)
9370 pedwarn (input_location, OPT_Wpedantic,
9371 "long, short, signed or unsigned used invalidly for %qs",
9372 name);
9373 if (flag_pedantic_errors)
9374 ok = 0;
9378 /* Discard the type modifiers if they are invalid. */
9379 if (! ok)
9381 unsigned_p = false;
9382 signed_p = false;
9383 long_p = false;
9384 short_p = false;
9385 longlong = 0;
9389 /* Decide whether an integer type is signed or not.
9390 Optionally treat bitfields as signed by default. */
9391 if (unsigned_p
9392 /* [class.bit]
9394 It is implementation-defined whether a plain (neither
9395 explicitly signed or unsigned) char, short, int, or long
9396 bit-field is signed or unsigned.
9398 Naturally, we extend this to long long as well. Note that
9399 this does not include wchar_t. */
9400 || (bitfield && !flag_signed_bitfields
9401 && !signed_p
9402 /* A typedef for plain `int' without `signed' can be
9403 controlled just like plain `int', but a typedef for
9404 `signed int' cannot be so controlled. */
9405 && !(typedef_decl
9406 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
9407 && TREE_CODE (type) == INTEGER_TYPE
9408 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
9410 if (explicit_intN)
9411 type = int_n_trees[declspecs->int_n_idx].unsigned_type;
9412 else if (longlong)
9413 type = long_long_unsigned_type_node;
9414 else if (long_p)
9415 type = long_unsigned_type_node;
9416 else if (short_p)
9417 type = short_unsigned_type_node;
9418 else if (type == char_type_node)
9419 type = unsigned_char_type_node;
9420 else if (typedef_decl)
9421 type = unsigned_type_for (type);
9422 else
9423 type = unsigned_type_node;
9425 else if (signed_p && type == char_type_node)
9426 type = signed_char_type_node;
9427 else if (explicit_intN)
9428 type = int_n_trees[declspecs->int_n_idx].signed_type;
9429 else if (longlong)
9430 type = long_long_integer_type_node;
9431 else if (long_p)
9432 type = long_integer_type_node;
9433 else if (short_p)
9434 type = short_integer_type_node;
9436 if (decl_spec_seq_has_spec_p (declspecs, ds_complex))
9438 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
9439 error ("complex invalid for %qs", name);
9440 /* If a modifier is specified, the resulting complex is the complex
9441 form of TYPE. E.g, "complex short" is "complex short int". */
9442 else if (type == integer_type_node)
9443 type = complex_integer_type_node;
9444 else if (type == float_type_node)
9445 type = complex_float_type_node;
9446 else if (type == double_type_node)
9447 type = complex_double_type_node;
9448 else if (type == long_double_type_node)
9449 type = complex_long_double_type_node;
9450 else
9451 type = build_complex_type (type);
9454 type_quals = TYPE_UNQUALIFIED;
9455 if (decl_spec_seq_has_spec_p (declspecs, ds_const))
9456 type_quals |= TYPE_QUAL_CONST;
9457 if (decl_spec_seq_has_spec_p (declspecs, ds_volatile))
9458 type_quals |= TYPE_QUAL_VOLATILE;
9459 if (decl_spec_seq_has_spec_p (declspecs, ds_restrict))
9460 type_quals |= TYPE_QUAL_RESTRICT;
9461 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
9462 error ("qualifiers are not allowed on declaration of %<operator %T%>",
9463 ctor_return_type);
9465 /* If we're using the injected-class-name to form a compound type or a
9466 declaration, replace it with the underlying class so we don't get
9467 redundant typedefs in the debug output. But if we are returning the
9468 type unchanged, leave it alone so that it's available to
9469 maybe_get_template_decl_from_type_decl. */
9470 if (CLASS_TYPE_P (type)
9471 && DECL_SELF_REFERENCE_P (TYPE_NAME (type))
9472 && type == TREE_TYPE (TYPE_NAME (type))
9473 && (declarator || type_quals))
9474 type = DECL_ORIGINAL_TYPE (TYPE_NAME (type));
9476 type_quals |= cp_type_quals (type);
9477 type = cp_build_qualified_type_real
9478 (type, type_quals, ((((typedef_decl && !DECL_ARTIFICIAL (typedef_decl))
9479 || declspecs->decltype_p)
9480 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
9481 /* We might have ignored or rejected some of the qualifiers. */
9482 type_quals = cp_type_quals (type);
9484 staticp = 0;
9485 inlinep = decl_spec_seq_has_spec_p (declspecs, ds_inline);
9486 virtualp = decl_spec_seq_has_spec_p (declspecs, ds_virtual);
9487 explicitp = decl_spec_seq_has_spec_p (declspecs, ds_explicit);
9489 storage_class = declspecs->storage_class;
9490 if (storage_class == sc_static)
9491 staticp = 1 + (decl_context == FIELD);
9493 if (virtualp && staticp == 2)
9495 error ("member %qD cannot be declared both virtual and static", dname);
9496 storage_class = sc_none;
9497 staticp = 0;
9499 friendp = decl_spec_seq_has_spec_p (declspecs, ds_friend);
9501 /* Issue errors about use of storage classes for parameters. */
9502 if (decl_context == PARM)
9504 if (typedef_p)
9506 error ("typedef declaration invalid in parameter declaration");
9507 return error_mark_node;
9509 else if (template_parm_flag && storage_class != sc_none)
9511 error ("storage class specified for template parameter %qs", name);
9512 return error_mark_node;
9514 else if (storage_class == sc_static
9515 || storage_class == sc_extern
9516 || thread_p)
9517 error ("storage class specifiers invalid in parameter declarations");
9519 /* Function parameters cannot be constexpr. If we saw one, moan
9520 and pretend it wasn't there. */
9521 if (constexpr_p)
9523 error ("a parameter cannot be declared %<constexpr%>");
9524 constexpr_p = 0;
9528 /* Give error if `virtual' is used outside of class declaration. */
9529 if (virtualp
9530 && (current_class_name == NULL_TREE || decl_context != FIELD))
9532 error ("%<virtual%> outside class declaration");
9533 virtualp = 0;
9536 /* Static anonymous unions are dealt with here. */
9537 if (staticp && decl_context == TYPENAME
9538 && declspecs->type
9539 && ANON_AGGR_TYPE_P (declspecs->type))
9540 decl_context = FIELD;
9542 /* Warn about storage classes that are invalid for certain
9543 kinds of declarations (parameters, typenames, etc.). */
9544 if (thread_p
9545 && ((storage_class
9546 && storage_class != sc_extern
9547 && storage_class != sc_static)
9548 || typedef_p))
9550 error ("multiple storage classes in declaration of %qs", name);
9551 thread_p = false;
9553 if (decl_context != NORMAL
9554 && ((storage_class != sc_none
9555 && storage_class != sc_mutable)
9556 || thread_p))
9558 if ((decl_context == PARM || decl_context == CATCHPARM)
9559 && (storage_class == sc_register
9560 || storage_class == sc_auto))
9562 else if (typedef_p)
9564 else if (decl_context == FIELD
9565 /* C++ allows static class elements. */
9566 && storage_class == sc_static)
9567 /* C++ also allows inlines and signed and unsigned elements,
9568 but in those cases we don't come in here. */
9570 else
9572 if (decl_context == FIELD)
9573 error ("storage class specified for %qs", name);
9574 else
9576 if (decl_context == PARM || decl_context == CATCHPARM)
9577 error ("storage class specified for parameter %qs", name);
9578 else
9579 error ("storage class specified for typename");
9581 if (storage_class == sc_register
9582 || storage_class == sc_auto
9583 || storage_class == sc_extern
9584 || thread_p)
9585 storage_class = sc_none;
9588 else if (storage_class == sc_extern && funcdef_flag
9589 && ! toplevel_bindings_p ())
9590 error ("nested function %qs declared %<extern%>", name);
9591 else if (toplevel_bindings_p ())
9593 if (storage_class == sc_auto)
9594 error ("top-level declaration of %qs specifies %<auto%>", name);
9596 else if (thread_p
9597 && storage_class != sc_extern
9598 && storage_class != sc_static)
9600 if (declspecs->gnu_thread_keyword_p)
9601 pedwarn (input_location, 0, "function-scope %qs implicitly auto and "
9602 "declared %<__thread%>", name);
9604 /* When thread_local is applied to a variable of block scope the
9605 storage-class-specifier static is implied if it does not appear
9606 explicitly. */
9607 storage_class = declspecs->storage_class = sc_static;
9608 staticp = 1;
9611 if (storage_class && friendp)
9613 error ("storage class specifiers invalid in friend function declarations");
9614 storage_class = sc_none;
9615 staticp = 0;
9618 if (!id_declarator)
9619 unqualified_id = NULL_TREE;
9620 else
9622 unqualified_id = id_declarator->u.id.unqualified_name;
9623 switch (TREE_CODE (unqualified_id))
9625 case BIT_NOT_EXPR:
9626 unqualified_id = TREE_OPERAND (unqualified_id, 0);
9627 if (TYPE_P (unqualified_id))
9628 unqualified_id = constructor_name (unqualified_id);
9629 break;
9631 case IDENTIFIER_NODE:
9632 case TEMPLATE_ID_EXPR:
9633 break;
9635 default:
9636 gcc_unreachable ();
9640 if (declspecs->std_attributes)
9642 /* Apply the c++11 attributes to the type preceding them. */
9643 input_location = declspecs->locations[ds_std_attribute];
9644 decl_attributes (&type, declspecs->std_attributes, 0);
9645 input_location = saved_loc;
9648 /* Determine the type of the entity declared by recurring on the
9649 declarator. */
9650 for (; declarator; declarator = declarator->declarator)
9652 const cp_declarator *inner_declarator;
9653 tree attrs;
9655 if (type == error_mark_node)
9656 return error_mark_node;
9658 attrs = declarator->attributes;
9659 if (attrs)
9661 int attr_flags;
9663 attr_flags = 0;
9664 if (declarator == NULL || declarator->kind == cdk_id)
9665 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
9666 if (declarator->kind == cdk_function)
9667 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
9668 if (declarator->kind == cdk_array)
9669 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
9670 returned_attrs = decl_attributes (&type,
9671 chainon (returned_attrs, attrs),
9672 attr_flags);
9675 if (declarator->kind == cdk_id)
9676 break;
9678 inner_declarator = declarator->declarator;
9680 switch (declarator->kind)
9682 case cdk_array:
9683 type = create_array_type_for_decl (dname, type,
9684 declarator->u.array.bounds);
9685 if (declarator->std_attributes)
9686 /* [dcl.array]/1:
9688 The optional attribute-specifier-seq appertains to the
9689 array. */
9690 returned_attrs = chainon (returned_attrs,
9691 declarator->std_attributes);
9692 break;
9694 case cdk_function:
9696 tree arg_types;
9697 int funcdecl_p;
9699 /* Declaring a function type.
9700 Make sure we have a valid type for the function to return. */
9702 if (type_quals != TYPE_UNQUALIFIED)
9704 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
9705 warning (OPT_Wignored_qualifiers,
9706 "type qualifiers ignored on function return type");
9707 /* We now know that the TYPE_QUALS don't apply to the
9708 decl, but to its return type. */
9709 type_quals = TYPE_UNQUALIFIED;
9711 errmsg = targetm.invalid_return_type (type);
9712 if (errmsg)
9714 error (errmsg);
9715 type = integer_type_node;
9718 /* Error about some types functions can't return. */
9720 if (TREE_CODE (type) == FUNCTION_TYPE)
9722 error ("%qs declared as function returning a function", name);
9723 return error_mark_node;
9725 if (TREE_CODE (type) == ARRAY_TYPE)
9727 error ("%qs declared as function returning an array", name);
9728 return error_mark_node;
9731 input_location = declspecs->locations[ds_type_spec];
9732 abstract_virtuals_error (ACU_RETURN, type);
9733 input_location = saved_loc;
9735 /* Pick up type qualifiers which should be applied to `this'. */
9736 memfn_quals = declarator->u.function.qualifiers;
9737 /* Pick up virt-specifiers. */
9738 virt_specifiers = declarator->u.function.virt_specifiers;
9739 /* And ref-qualifier, too */
9740 rqual = declarator->u.function.ref_qualifier;
9741 /* Pick up the exception specifications. */
9742 raises = declarator->u.function.exception_specification;
9743 /* If the exception-specification is ill-formed, let's pretend
9744 there wasn't one. */
9745 if (raises == error_mark_node)
9746 raises = NULL_TREE;
9748 /* Say it's a definition only for the CALL_EXPR
9749 closest to the identifier. */
9750 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
9752 /* Handle a late-specified return type. */
9753 if (funcdecl_p)
9755 if (type_uses_auto (type))
9757 if (!declarator->u.function.late_return_type)
9759 if (current_class_type
9760 && LAMBDA_TYPE_P (current_class_type))
9761 /* OK for C++11 lambdas. */;
9762 else if (cxx_dialect < cxx14)
9764 error ("%qs function uses "
9765 "%<auto%> type specifier without trailing "
9766 "return type", name);
9767 inform (input_location, "deduced return type "
9768 "only available with -std=c++14 or "
9769 "-std=gnu++14");
9771 else if (virtualp)
9773 error ("virtual function cannot "
9774 "have deduced return type");
9775 virtualp = false;
9778 else if (!is_auto (type))
9780 error ("%qs function with trailing return type has"
9781 " %qT as its type rather than plain %<auto%>",
9782 name, type);
9783 return error_mark_node;
9786 else if (declarator->u.function.late_return_type)
9788 if (cxx_dialect < cxx11)
9789 /* Not using maybe_warn_cpp0x because this should
9790 always be an error. */
9791 error ("trailing return type only available with "
9792 "-std=c++11 or -std=gnu++11");
9793 else
9794 error ("%qs function with trailing return type not "
9795 "declared with %<auto%> type specifier", name);
9796 return error_mark_node;
9799 type = splice_late_return_type
9800 (type, declarator->u.function.late_return_type);
9801 if (type == error_mark_node)
9802 return error_mark_node;
9804 if (declarator->u.function.late_return_type)
9805 late_return_type_p = true;
9807 if (ctype == NULL_TREE
9808 && decl_context == FIELD
9809 && funcdecl_p
9810 && friendp == 0)
9811 ctype = current_class_type;
9813 if (ctype && (sfk == sfk_constructor
9814 || sfk == sfk_destructor))
9816 /* We are within a class's scope. If our declarator name
9817 is the same as the class name, and we are defining
9818 a function, then it is a constructor/destructor, and
9819 therefore returns a void type. */
9821 /* ISO C++ 12.4/2. A destructor may not be declared
9822 const or volatile. A destructor may not be static.
9823 A destructor may not be declared with ref-qualifier.
9825 ISO C++ 12.1. A constructor may not be declared
9826 const or volatile. A constructor may not be
9827 virtual. A constructor may not be static.
9828 A constructor may not be declared with ref-qualifier. */
9829 if (staticp == 2)
9830 error ((flags == DTOR_FLAG)
9831 ? G_("destructor cannot be static member function")
9832 : G_("constructor cannot be static member function"));
9833 if (memfn_quals)
9835 error ((flags == DTOR_FLAG)
9836 ? G_("destructors may not be cv-qualified")
9837 : G_("constructors may not be cv-qualified"));
9838 memfn_quals = TYPE_UNQUALIFIED;
9841 if (rqual)
9843 maybe_warn_cpp0x (CPP0X_REF_QUALIFIER);
9844 error ((flags == DTOR_FLAG)
9845 ? "destructors may not be ref-qualified"
9846 : "constructors may not be ref-qualified");
9847 rqual = REF_QUAL_NONE;
9850 if (decl_context == FIELD
9851 && !member_function_or_else (ctype,
9852 current_class_type,
9853 flags))
9854 return error_mark_node;
9856 if (flags != DTOR_FLAG)
9858 /* It's a constructor. */
9859 if (explicitp == 1)
9860 explicitp = 2;
9861 if (virtualp)
9863 permerror (input_location, "constructors cannot be declared virtual");
9864 virtualp = 0;
9866 if (decl_context == FIELD
9867 && sfk != sfk_constructor)
9868 return error_mark_node;
9870 if (decl_context == FIELD)
9871 staticp = 0;
9873 else if (friendp)
9875 if (virtualp)
9877 /* Cannot be both friend and virtual. */
9878 error ("virtual functions cannot be friends");
9879 friendp = 0;
9881 if (decl_context == NORMAL)
9882 error ("friend declaration not in class definition");
9883 if (current_function_decl && funcdef_flag)
9884 error ("can%'t define friend function %qs in a local "
9885 "class definition",
9886 name);
9888 else if (ctype && sfk == sfk_conversion)
9890 if (explicitp == 1)
9892 maybe_warn_cpp0x (CPP0X_EXPLICIT_CONVERSION);
9893 explicitp = 2;
9897 arg_types = grokparms (declarator->u.function.parameters,
9898 &parms);
9900 if (inner_declarator
9901 && inner_declarator->kind == cdk_id
9902 && inner_declarator->u.id.sfk == sfk_destructor
9903 && arg_types != void_list_node)
9905 error ("destructors may not have parameters");
9906 arg_types = void_list_node;
9907 parms = NULL_TREE;
9910 type = build_function_type (type, arg_types);
9911 if (declarator->std_attributes)
9912 /* [dcl.fct]/2:
9914 The optional attribute-specifier-seq appertains to
9915 the function type. */
9916 decl_attributes (&type, declarator->std_attributes,
9919 break;
9921 case cdk_pointer:
9922 case cdk_reference:
9923 case cdk_ptrmem:
9924 /* Filter out pointers-to-references and references-to-references.
9925 We can get these if a TYPE_DECL is used. */
9927 if (TREE_CODE (type) == REFERENCE_TYPE)
9929 if (declarator->kind != cdk_reference)
9931 error ("cannot declare pointer to %q#T", type);
9932 type = TREE_TYPE (type);
9935 /* In C++0x, we allow reference to reference declarations
9936 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
9937 and template type arguments [14.3.1/4 temp.arg.type]. The
9938 check for direct reference to reference declarations, which
9939 are still forbidden, occurs below. Reasoning behind the change
9940 can be found in DR106, DR540, and the rvalue reference
9941 proposals. */
9942 else if (cxx_dialect == cxx98)
9944 error ("cannot declare reference to %q#T", type);
9945 type = TREE_TYPE (type);
9948 else if (VOID_TYPE_P (type))
9950 if (declarator->kind == cdk_reference)
9951 error ("cannot declare reference to %q#T", type);
9952 else if (declarator->kind == cdk_ptrmem)
9953 error ("cannot declare pointer to %q#T member", type);
9956 /* We now know that the TYPE_QUALS don't apply to the decl,
9957 but to the target of the pointer. */
9958 type_quals = TYPE_UNQUALIFIED;
9960 /* This code used to handle METHOD_TYPE, but I don't think it's
9961 possible to get it here anymore. */
9962 gcc_assert (TREE_CODE (type) != METHOD_TYPE);
9963 if (declarator->kind == cdk_ptrmem
9964 && TREE_CODE (type) == FUNCTION_TYPE)
9966 memfn_quals |= type_memfn_quals (type);
9967 type = build_memfn_type (type,
9968 declarator->u.pointer.class_type,
9969 memfn_quals,
9970 rqual);
9971 if (type == error_mark_node)
9972 return error_mark_node;
9974 rqual = REF_QUAL_NONE;
9975 memfn_quals = TYPE_UNQUALIFIED;
9978 if (TREE_CODE (type) == FUNCTION_TYPE
9979 && (type_memfn_quals (type) != TYPE_UNQUALIFIED
9980 || type_memfn_rqual (type) != REF_QUAL_NONE))
9981 error (declarator->kind == cdk_reference
9982 ? G_("cannot declare reference to qualified function type %qT")
9983 : G_("cannot declare pointer to qualified function type %qT"),
9984 type);
9986 /* When the pointed-to type involves components of variable size,
9987 care must be taken to ensure that the size evaluation code is
9988 emitted early enough to dominate all the possible later uses
9989 and late enough for the variables on which it depends to have
9990 been assigned.
9992 This is expected to happen automatically when the pointed-to
9993 type has a name/declaration of it's own, but special attention
9994 is required if the type is anonymous.
9996 We handle the NORMAL and FIELD contexts here by inserting a
9997 dummy statement that just evaluates the size at a safe point
9998 and ensures it is not deferred until e.g. within a deeper
9999 conditional context (c++/43555).
10001 We expect nothing to be needed here for PARM or TYPENAME.
10002 Evaluating the size at this point for TYPENAME would
10003 actually be incorrect, as we might be in the middle of an
10004 expression with side effects on the pointed-to type size
10005 "arguments" prior to the pointer declaration point and the
10006 size evaluation could end up prior to the side effects. */
10008 if (!TYPE_NAME (type)
10009 && (decl_context == NORMAL || decl_context == FIELD)
10010 && at_function_scope_p ()
10011 && variably_modified_type_p (type, NULL_TREE))
10012 /* Force evaluation of the SAVE_EXPR. */
10013 finish_expr_stmt (TYPE_SIZE (type));
10015 if (declarator->kind == cdk_reference)
10017 /* In C++0x, the type we are creating a reference to might be
10018 a typedef which is itself a reference type. In that case,
10019 we follow the reference collapsing rules in
10020 [7.1.3/8 dcl.typedef] to create the final reference type:
10022 "If a typedef TD names a type that is a reference to a type
10023 T, an attempt to create the type 'lvalue reference to cv TD'
10024 creates the type 'lvalue reference to T,' while an attempt
10025 to create the type "rvalue reference to cv TD' creates the
10026 type TD."
10028 if (VOID_TYPE_P (type))
10029 /* We already gave an error. */;
10030 else if (TREE_CODE (type) == REFERENCE_TYPE)
10032 if (declarator->u.reference.rvalue_ref)
10033 /* Leave type alone. */;
10034 else
10035 type = cp_build_reference_type (TREE_TYPE (type), false);
10037 else
10038 type = cp_build_reference_type
10039 (type, declarator->u.reference.rvalue_ref);
10041 /* In C++0x, we need this check for direct reference to
10042 reference declarations, which are forbidden by
10043 [8.3.2/5 dcl.ref]. Reference to reference declarations
10044 are only allowed indirectly through typedefs and template
10045 type arguments. Example:
10047 void foo(int & &); // invalid ref-to-ref decl
10049 typedef int & int_ref;
10050 void foo(int_ref &); // valid ref-to-ref decl
10052 if (inner_declarator && inner_declarator->kind == cdk_reference)
10053 error ("cannot declare reference to %q#T, which is not "
10054 "a typedef or a template type argument", type);
10056 else if (TREE_CODE (type) == METHOD_TYPE)
10057 type = build_ptrmemfunc_type (build_pointer_type (type));
10058 else if (declarator->kind == cdk_ptrmem)
10060 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
10061 != NAMESPACE_DECL);
10062 if (declarator->u.pointer.class_type == error_mark_node)
10063 /* We will already have complained. */
10064 type = error_mark_node;
10065 else
10066 type = build_ptrmem_type (declarator->u.pointer.class_type,
10067 type);
10069 else
10070 type = build_pointer_type (type);
10072 /* Process a list of type modifier keywords (such as
10073 const or volatile) that were given inside the `*' or `&'. */
10075 if (declarator->u.pointer.qualifiers)
10077 type
10078 = cp_build_qualified_type (type,
10079 declarator->u.pointer.qualifiers);
10080 type_quals = cp_type_quals (type);
10083 /* Apply C++11 attributes to the pointer, and not to the
10084 type pointed to. This is unlike what is done for GNU
10085 attributes above. It is to comply with [dcl.ptr]/1:
10087 [the optional attribute-specifier-seq (7.6.1) appertains
10088 to the pointer and not to the object pointed to]. */
10089 if (declarator->std_attributes)
10090 decl_attributes (&type, declarator->std_attributes,
10093 ctype = NULL_TREE;
10094 break;
10096 case cdk_error:
10097 break;
10099 default:
10100 gcc_unreachable ();
10104 /* A `constexpr' specifier used in an object declaration declares
10105 the object as `const'. */
10106 if (constexpr_p && innermost_code != cdk_function)
10108 if (type_quals & TYPE_QUAL_VOLATILE)
10109 error ("both %<volatile%> and %<constexpr%> cannot be used here");
10110 if (TREE_CODE (type) != REFERENCE_TYPE)
10112 type_quals |= TYPE_QUAL_CONST;
10113 type = cp_build_qualified_type (type, type_quals);
10117 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
10118 && TREE_CODE (type) != FUNCTION_TYPE
10119 && TREE_CODE (type) != METHOD_TYPE
10120 && !variable_template_p (TREE_OPERAND (unqualified_id, 0)))
10122 error ("template-id %qD used as a declarator",
10123 unqualified_id);
10124 unqualified_id = dname;
10127 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
10128 qualified with a class-name, turn it into a METHOD_TYPE, unless
10129 we know that the function is static. We take advantage of this
10130 opportunity to do other processing that pertains to entities
10131 explicitly declared to be class members. Note that if DECLARATOR
10132 is non-NULL, we know it is a cdk_id declarator; otherwise, we
10133 would not have exited the loop above. */
10134 if (declarator
10135 && declarator->u.id.qualifying_scope
10136 && MAYBE_CLASS_TYPE_P (declarator->u.id.qualifying_scope))
10138 ctype = declarator->u.id.qualifying_scope;
10139 ctype = TYPE_MAIN_VARIANT (ctype);
10140 template_count = num_template_headers_for_class (ctype);
10142 if (ctype == current_class_type)
10144 if (friendp)
10146 permerror (input_location, "member functions are implicitly friends of their class");
10147 friendp = 0;
10149 else
10150 permerror (declarator->id_loc,
10151 "extra qualification %<%T::%> on member %qs",
10152 ctype, name);
10154 else if (/* If the qualifying type is already complete, then we
10155 can skip the following checks. */
10156 !COMPLETE_TYPE_P (ctype)
10157 && (/* If the function is being defined, then
10158 qualifying type must certainly be complete. */
10159 funcdef_flag
10160 /* A friend declaration of "T::f" is OK, even if
10161 "T" is a template parameter. But, if this
10162 function is not a friend, the qualifying type
10163 must be a class. */
10164 || (!friendp && !CLASS_TYPE_P (ctype))
10165 /* For a declaration, the type need not be
10166 complete, if either it is dependent (since there
10167 is no meaningful definition of complete in that
10168 case) or the qualifying class is currently being
10169 defined. */
10170 || !(dependent_type_p (ctype)
10171 || currently_open_class (ctype)))
10172 /* Check that the qualifying type is complete. */
10173 && !complete_type_or_else (ctype, NULL_TREE))
10174 return error_mark_node;
10175 else if (TREE_CODE (type) == FUNCTION_TYPE)
10177 if (current_class_type
10178 && (!friendp || funcdef_flag))
10180 error (funcdef_flag
10181 ? G_("cannot define member function %<%T::%s%> "
10182 "within %<%T%>")
10183 : G_("cannot declare member function %<%T::%s%> "
10184 "within %<%T%>"),
10185 ctype, name, current_class_type);
10186 return error_mark_node;
10189 else if (typedef_p && current_class_type)
10191 error ("cannot declare member %<%T::%s%> within %qT",
10192 ctype, name, current_class_type);
10193 return error_mark_node;
10197 if (ctype == NULL_TREE && decl_context == FIELD && friendp == 0)
10198 ctype = current_class_type;
10200 /* Now TYPE has the actual type. */
10202 if (returned_attrs)
10204 if (attrlist)
10205 *attrlist = chainon (returned_attrs, *attrlist);
10206 else
10207 attrlist = &returned_attrs;
10210 if (declarator
10211 && declarator->kind == cdk_id
10212 && declarator->std_attributes)
10213 /* [dcl.meaning]/1: The optional attribute-specifier-seq following
10214 a declarator-id appertains to the entity that is declared. */
10215 *attrlist = chainon (*attrlist, declarator->std_attributes);
10217 /* Handle parameter packs. */
10218 if (parameter_pack_p)
10220 if (decl_context == PARM)
10221 /* Turn the type into a pack expansion.*/
10222 type = make_pack_expansion (type);
10223 else
10224 error ("non-parameter %qs cannot be a parameter pack", name);
10227 /* Did array size calculations overflow or does the array cover more
10228 than half of the address-space? */
10229 if (TREE_CODE (type) == ARRAY_TYPE
10230 && COMPLETE_TYPE_P (type)
10231 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
10232 && ! valid_constant_size_p (TYPE_SIZE_UNIT (type)))
10234 error ("size of array %qs is too large", name);
10235 /* If we proceed with the array type as it is, we'll eventually
10236 crash in tree_to_[su]hwi(). */
10237 type = error_mark_node;
10240 if ((decl_context == FIELD || decl_context == PARM)
10241 && !processing_template_decl
10242 && variably_modified_type_p (type, NULL_TREE))
10244 if (decl_context == FIELD)
10245 error ("data member may not have variably modified type %qT", type);
10246 else
10247 error ("parameter may not have variably modified type %qT", type);
10248 type = error_mark_node;
10251 if (explicitp == 1 || (explicitp && friendp))
10253 /* [dcl.fct.spec] (C++11) The explicit specifier shall be used only
10254 in the declaration of a constructor or conversion function within
10255 a class definition. */
10256 if (!current_class_type)
10257 error ("%<explicit%> outside class declaration");
10258 else if (friendp)
10259 error ("%<explicit%> in friend declaration");
10260 else
10261 error ("only declarations of constructors and conversion operators "
10262 "can be %<explicit%>");
10263 explicitp = 0;
10266 if (storage_class == sc_mutable)
10268 if (decl_context != FIELD || friendp)
10270 error ("non-member %qs cannot be declared %<mutable%>", name);
10271 storage_class = sc_none;
10273 else if (decl_context == TYPENAME || typedef_p)
10275 error ("non-object member %qs cannot be declared %<mutable%>", name);
10276 storage_class = sc_none;
10278 else if (TREE_CODE (type) == FUNCTION_TYPE
10279 || TREE_CODE (type) == METHOD_TYPE)
10281 error ("function %qs cannot be declared %<mutable%>", name);
10282 storage_class = sc_none;
10284 else if (staticp)
10286 error ("static %qs cannot be declared %<mutable%>", name);
10287 storage_class = sc_none;
10289 else if (type_quals & TYPE_QUAL_CONST)
10291 error ("const %qs cannot be declared %<mutable%>", name);
10292 storage_class = sc_none;
10294 else if (TREE_CODE (type) == REFERENCE_TYPE)
10296 permerror (input_location, "reference %qs cannot be declared "
10297 "%<mutable%>", name);
10298 storage_class = sc_none;
10302 /* If this is declaring a typedef name, return a TYPE_DECL. */
10303 if (typedef_p && decl_context != TYPENAME)
10305 tree decl;
10307 /* Note that the grammar rejects storage classes
10308 in typenames, fields or parameters. */
10309 if (current_lang_name == lang_name_java)
10310 TYPE_FOR_JAVA (type) = 1;
10312 /* This declaration:
10314 typedef void f(int) const;
10316 declares a function type which is not a member of any
10317 particular class, but which is cv-qualified; for
10318 example "f S::*" declares a pointer to a const-qualified
10319 member function of S. We record the cv-qualification in the
10320 function type. */
10321 if ((rqual || memfn_quals) && TREE_CODE (type) == FUNCTION_TYPE)
10323 type = apply_memfn_quals (type, memfn_quals, rqual);
10325 /* We have now dealt with these qualifiers. */
10326 memfn_quals = TYPE_UNQUALIFIED;
10327 rqual = REF_QUAL_NONE;
10330 if (type_uses_auto (type))
10332 error ("typedef declared %<auto%>");
10333 type = error_mark_node;
10336 if (decl_context == FIELD)
10337 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
10338 else
10339 decl = build_decl (input_location, TYPE_DECL, unqualified_id, type);
10340 if (id_declarator && declarator->u.id.qualifying_scope) {
10341 error_at (DECL_SOURCE_LOCATION (decl),
10342 "typedef name may not be a nested-name-specifier");
10343 TREE_TYPE (decl) = error_mark_node;
10346 if (decl_context != FIELD)
10348 if (!current_function_decl)
10349 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
10350 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
10351 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
10352 (current_function_decl)))
10353 /* The TYPE_DECL is "abstract" because there will be
10354 clones of this constructor/destructor, and there will
10355 be copies of this TYPE_DECL generated in those
10356 clones. The decloning optimization (for space) may
10357 revert this subsequently if it determines that
10358 the clones should share a common implementation. */
10359 DECL_ABSTRACT_P (decl) = true;
10361 else if (current_class_type
10362 && constructor_name_p (unqualified_id, current_class_type))
10363 permerror (input_location, "ISO C++ forbids nested type %qD with same name "
10364 "as enclosing class",
10365 unqualified_id);
10367 /* If the user declares "typedef struct {...} foo" then the
10368 struct will have an anonymous name. Fill that name in now.
10369 Nothing can refer to it, so nothing needs know about the name
10370 change. */
10371 if (type != error_mark_node
10372 && unqualified_id
10373 && TYPE_NAME (type)
10374 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
10375 && TYPE_ANONYMOUS_P (type)
10376 && declspecs->type_definition_p
10377 && attributes_naming_typedef_ok (*attrlist)
10378 && cp_type_quals (type) == TYPE_UNQUALIFIED)
10380 tree t;
10382 /* Replace the anonymous name with the real name everywhere. */
10383 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
10385 if (ANON_AGGRNAME_P (TYPE_IDENTIFIER (t)))
10386 /* We do not rename the debug info representing the
10387 anonymous tagged type because the standard says in
10388 [dcl.typedef] that the naming applies only for
10389 linkage purposes. */
10390 /*debug_hooks->set_name (t, decl);*/
10391 TYPE_NAME (t) = decl;
10394 if (TYPE_LANG_SPECIFIC (type))
10395 TYPE_WAS_ANONYMOUS (type) = 1;
10397 /* If this is a typedef within a template class, the nested
10398 type is a (non-primary) template. The name for the
10399 template needs updating as well. */
10400 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
10401 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
10402 = TYPE_IDENTIFIER (type);
10404 /* Adjust linkage now that we aren't anonymous anymore. */
10405 reset_type_linkage (type);
10407 /* FIXME remangle member functions; member functions of a
10408 type with external linkage have external linkage. */
10411 if (signed_p
10412 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
10413 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
10415 bad_specifiers (decl, BSP_TYPE, virtualp,
10416 memfn_quals != TYPE_UNQUALIFIED,
10417 inlinep, friendp, raises != NULL_TREE);
10419 if (decl_spec_seq_has_spec_p (declspecs, ds_alias))
10420 /* Acknowledge that this was written:
10421 `using analias = atype;'. */
10422 TYPE_DECL_ALIAS_P (decl) = 1;
10424 return decl;
10427 /* Detect the case of an array type of unspecified size
10428 which came, as such, direct from a typedef name.
10429 We must copy the type, so that the array's domain can be
10430 individually set by the object's initializer. */
10432 if (type && typedef_type
10433 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
10434 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
10435 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
10437 /* Detect where we're using a typedef of function type to declare a
10438 function. PARMS will not be set, so we must create it now. */
10440 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
10442 tree decls = NULL_TREE;
10443 tree args;
10445 for (args = TYPE_ARG_TYPES (type);
10446 args && args != void_list_node;
10447 args = TREE_CHAIN (args))
10449 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
10451 DECL_CHAIN (decl) = decls;
10452 decls = decl;
10455 parms = nreverse (decls);
10457 if (decl_context != TYPENAME)
10459 /* The qualifiers on the function type become the qualifiers on
10460 the non-static member function. */
10461 memfn_quals |= type_memfn_quals (type);
10462 rqual = type_memfn_rqual (type);
10463 type_quals = TYPE_UNQUALIFIED;
10467 /* If this is a type name (such as, in a cast or sizeof),
10468 compute the type and return it now. */
10470 if (decl_context == TYPENAME)
10472 /* Note that the grammar rejects storage classes
10473 in typenames, fields or parameters. */
10474 if (type_quals != TYPE_UNQUALIFIED)
10475 type_quals = TYPE_UNQUALIFIED;
10477 /* Special case: "friend class foo" looks like a TYPENAME context. */
10478 if (friendp)
10480 if (type_quals != TYPE_UNQUALIFIED)
10482 error ("type qualifiers specified for friend class declaration");
10483 type_quals = TYPE_UNQUALIFIED;
10485 if (inlinep)
10487 error ("%<inline%> specified for friend class declaration");
10488 inlinep = 0;
10491 if (!current_aggr)
10493 /* Don't allow friend declaration without a class-key. */
10494 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
10495 permerror (input_location, "template parameters cannot be friends");
10496 else if (TREE_CODE (type) == TYPENAME_TYPE)
10497 permerror (input_location, "friend declaration requires class-key, "
10498 "i.e. %<friend class %T::%D%>",
10499 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
10500 else
10501 permerror (input_location, "friend declaration requires class-key, "
10502 "i.e. %<friend %#T%>",
10503 type);
10506 /* Only try to do this stuff if we didn't already give up. */
10507 if (type != integer_type_node)
10509 /* A friendly class? */
10510 if (current_class_type)
10511 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
10512 /*complain=*/true);
10513 else
10514 error ("trying to make class %qT a friend of global scope",
10515 type);
10517 type = void_type_node;
10520 else if (memfn_quals || rqual)
10522 if (ctype == NULL_TREE
10523 && TREE_CODE (type) == METHOD_TYPE)
10524 ctype = TYPE_METHOD_BASETYPE (type);
10526 if (ctype)
10527 type = build_memfn_type (type, ctype, memfn_quals, rqual);
10528 /* Core issue #547: need to allow this in template type args.
10529 Allow it in general in C++11 for alias-declarations. */
10530 else if ((template_type_arg || cxx_dialect >= cxx11)
10531 && TREE_CODE (type) == FUNCTION_TYPE)
10532 type = apply_memfn_quals (type, memfn_quals, rqual);
10533 else
10534 error ("invalid qualifiers on non-member function type");
10537 return type;
10539 else if (unqualified_id == NULL_TREE && decl_context != PARM
10540 && decl_context != CATCHPARM
10541 && TREE_CODE (type) != UNION_TYPE
10542 && ! bitfield)
10544 error ("abstract declarator %qT used as declaration", type);
10545 return error_mark_node;
10548 /* Only functions may be declared using an operator-function-id. */
10549 if (unqualified_id
10550 && IDENTIFIER_OPNAME_P (unqualified_id)
10551 && TREE_CODE (type) != FUNCTION_TYPE
10552 && TREE_CODE (type) != METHOD_TYPE)
10554 error ("declaration of %qD as non-function", unqualified_id);
10555 return error_mark_node;
10558 /* We don't check parameter types here because we can emit a better
10559 error message later. */
10560 if (decl_context != PARM)
10562 type = check_var_type (unqualified_id, type);
10563 if (type == error_mark_node)
10564 return error_mark_node;
10567 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
10568 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
10570 if (decl_context == PARM || decl_context == CATCHPARM)
10572 if (ctype || in_namespace)
10573 error ("cannot use %<::%> in parameter declaration");
10575 if (type_uses_auto (type))
10577 if (cxx_dialect >= cxx14)
10578 error ("%<auto%> parameter not permitted in this context");
10579 else
10580 error ("parameter declared %<auto%>");
10581 type = error_mark_node;
10584 /* A parameter declared as an array of T is really a pointer to T.
10585 One declared as a function is really a pointer to a function.
10586 One declared as a member is really a pointer to member. */
10588 if (TREE_CODE (type) == ARRAY_TYPE)
10590 /* Transfer const-ness of array into that of type pointed to. */
10591 type = build_pointer_type (TREE_TYPE (type));
10592 type_quals = TYPE_UNQUALIFIED;
10593 array_parameter_p = true;
10595 else if (TREE_CODE (type) == FUNCTION_TYPE)
10596 type = build_pointer_type (type);
10599 if (ctype && TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
10600 && !NEW_DELETE_OPNAME_P (unqualified_id))
10602 cp_cv_quals real_quals = memfn_quals;
10603 if (cxx_dialect < cxx14 && constexpr_p
10604 && sfk != sfk_constructor && sfk != sfk_destructor)
10605 real_quals |= TYPE_QUAL_CONST;
10606 type = build_memfn_type (type, ctype, real_quals, rqual);
10610 tree decl;
10612 if (decl_context == PARM)
10614 decl = cp_build_parm_decl (unqualified_id, type);
10615 DECL_ARRAY_PARAMETER_P (decl) = array_parameter_p;
10617 bad_specifiers (decl, BSP_PARM, virtualp,
10618 memfn_quals != TYPE_UNQUALIFIED,
10619 inlinep, friendp, raises != NULL_TREE);
10621 else if (decl_context == FIELD)
10623 if (!staticp && TREE_CODE (type) != METHOD_TYPE
10624 && type_uses_auto (type))
10626 error ("non-static data member declared %<auto%>");
10627 type = error_mark_node;
10630 /* The C99 flexible array extension. */
10631 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
10632 && TYPE_DOMAIN (type) == NULL_TREE)
10634 tree itype = compute_array_index_type (dname, integer_zero_node,
10635 tf_warning_or_error);
10636 type = build_cplus_array_type (TREE_TYPE (type), itype);
10639 if (type == error_mark_node)
10641 /* Happens when declaring arrays of sizes which
10642 are error_mark_node, for example. */
10643 decl = NULL_TREE;
10645 else if (in_namespace && !friendp)
10647 /* Something like struct S { int N::j; }; */
10648 error ("invalid use of %<::%>");
10649 return error_mark_node;
10651 else if (TREE_CODE (type) == FUNCTION_TYPE
10652 || TREE_CODE (type) == METHOD_TYPE)
10654 int publicp = 0;
10655 tree function_context;
10657 if (friendp == 0)
10659 /* This should never happen in pure C++ (the check
10660 could be an assert). It could happen in
10661 Objective-C++ if someone writes invalid code that
10662 uses a function declaration for an instance
10663 variable or property (instance variables and
10664 properties are parsed as FIELD_DECLs, but they are
10665 part of an Objective-C class, not a C++ class).
10666 That code is invalid and is caught by this
10667 check. */
10668 if (!ctype)
10670 error ("declaration of function %qD in invalid context",
10671 unqualified_id);
10672 return error_mark_node;
10675 /* ``A union may [ ... ] not [ have ] virtual functions.''
10676 ARM 9.5 */
10677 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
10679 error ("function %qD declared virtual inside a union",
10680 unqualified_id);
10681 return error_mark_node;
10684 if (NEW_DELETE_OPNAME_P (unqualified_id))
10686 if (virtualp)
10688 error ("%qD cannot be declared virtual, since it "
10689 "is always static",
10690 unqualified_id);
10691 virtualp = 0;
10696 /* Check that the name used for a destructor makes sense. */
10697 if (sfk == sfk_destructor)
10699 tree uqname = id_declarator->u.id.unqualified_name;
10701 if (!ctype)
10703 gcc_assert (friendp);
10704 error ("expected qualified name in friend declaration "
10705 "for destructor %qD", uqname);
10706 return error_mark_node;
10709 if (!check_dtor_name (ctype, TREE_OPERAND (uqname, 0)))
10711 error ("declaration of %qD as member of %qT",
10712 uqname, ctype);
10713 return error_mark_node;
10715 if (constexpr_p)
10717 error ("a destructor cannot be %<constexpr%>");
10718 return error_mark_node;
10721 else if (sfk == sfk_constructor && friendp && !ctype)
10723 error ("expected qualified name in friend declaration "
10724 "for constructor %qD",
10725 id_declarator->u.id.unqualified_name);
10726 return error_mark_node;
10729 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
10731 tree tmpl = TREE_OPERAND (unqualified_id, 0);
10732 if (variable_template_p (tmpl))
10734 error ("specialization of variable template %qD "
10735 "declared as function", tmpl);
10736 inform (DECL_SOURCE_LOCATION (tmpl),
10737 "variable template declared here");
10738 return error_mark_node;
10742 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
10743 function_context = (ctype != NULL_TREE) ?
10744 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
10745 publicp = (! friendp || ! staticp)
10746 && function_context == NULL_TREE;
10748 if (late_return_type_p)
10749 TYPE_HAS_LATE_RETURN_TYPE (type) = 1;
10751 decl = grokfndecl (ctype, type,
10752 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
10753 ? unqualified_id : dname,
10754 parms,
10755 unqualified_id,
10756 virtualp, flags, memfn_quals, rqual, raises,
10757 friendp ? -1 : 0, friendp, publicp,
10758 inlinep | (2 * constexpr_p),
10759 sfk,
10760 funcdef_flag, template_count, in_namespace,
10761 attrlist, declarator->id_loc);
10762 decl = set_virt_specifiers (decl, virt_specifiers);
10763 if (decl == NULL_TREE)
10764 return error_mark_node;
10765 #if 0
10766 /* This clobbers the attrs stored in `decl' from `attrlist'. */
10767 /* The decl and setting of decl_attr is also turned off. */
10768 decl = build_decl_attribute_variant (decl, decl_attr);
10769 #endif
10771 /* [class.conv.ctor]
10773 A constructor declared without the function-specifier
10774 explicit that can be called with a single parameter
10775 specifies a conversion from the type of its first
10776 parameter to the type of its class. Such a constructor
10777 is called a converting constructor. */
10778 if (explicitp == 2)
10779 DECL_NONCONVERTING_P (decl) = 1;
10781 else if (!staticp && !dependent_type_p (type)
10782 && !COMPLETE_TYPE_P (complete_type (type))
10783 && (TREE_CODE (type) != ARRAY_TYPE
10784 || !COMPLETE_TYPE_P (TREE_TYPE (type))
10785 || initialized == 0))
10787 if (unqualified_id)
10789 error ("field %qD has incomplete type %qT",
10790 unqualified_id, type);
10791 cxx_incomplete_type_inform (strip_array_types (type));
10793 else
10794 error ("name %qT has incomplete type", type);
10796 type = error_mark_node;
10797 decl = NULL_TREE;
10799 else
10801 if (friendp)
10803 error ("%qE is neither function nor member function; "
10804 "cannot be declared friend", unqualified_id);
10805 friendp = 0;
10807 decl = NULL_TREE;
10810 if (friendp)
10812 /* Friends are treated specially. */
10813 if (ctype == current_class_type)
10814 ; /* We already issued a permerror. */
10815 else if (decl && DECL_NAME (decl))
10817 if (template_class_depth (current_class_type) == 0)
10819 decl = check_explicit_specialization
10820 (unqualified_id, decl, template_count,
10821 2 * funcdef_flag + 4);
10822 if (decl == error_mark_node)
10823 return error_mark_node;
10826 decl = do_friend (ctype, unqualified_id, decl,
10827 *attrlist, flags,
10828 funcdef_flag);
10829 return decl;
10831 else
10832 return error_mark_node;
10835 /* Structure field. It may not be a function, except for C++. */
10837 if (decl == NULL_TREE)
10839 if (staticp)
10841 /* C++ allows static class members. All other work
10842 for this is done by grokfield. */
10843 decl = build_lang_decl_loc (declarator
10844 ? declarator->id_loc
10845 : input_location,
10846 VAR_DECL, unqualified_id, type);
10847 set_linkage_for_static_data_member (decl);
10848 /* Even if there is an in-class initialization, DECL
10849 is considered undefined until an out-of-class
10850 definition is provided. */
10851 DECL_EXTERNAL (decl) = 1;
10853 if (thread_p)
10855 set_decl_tls_model (decl, decl_default_tls_model (decl));
10856 if (declspecs->gnu_thread_keyword_p)
10857 DECL_GNU_TLS_P (decl) = true;
10860 if (constexpr_p && !initialized)
10862 error ("constexpr static data member %qD must have an "
10863 "initializer", decl);
10864 constexpr_p = false;
10867 else
10869 if (constexpr_p)
10871 error ("non-static data member %qE declared %<constexpr%>",
10872 unqualified_id);
10873 constexpr_p = false;
10875 decl = build_decl (input_location,
10876 FIELD_DECL, unqualified_id, type);
10877 DECL_NONADDRESSABLE_P (decl) = bitfield;
10878 if (bitfield && !unqualified_id)
10879 TREE_NO_WARNING (decl) = 1;
10881 if (storage_class == sc_mutable)
10883 DECL_MUTABLE_P (decl) = 1;
10884 storage_class = sc_none;
10887 if (initialized)
10889 /* An attempt is being made to initialize a non-static
10890 member. This is new in C++11. */
10891 maybe_warn_cpp0x (CPP0X_NSDMI);
10893 /* If this has been parsed with static storage class, but
10894 errors forced staticp to be cleared, ensure NSDMI is
10895 not present. */
10896 if (declspecs->storage_class == sc_static)
10897 DECL_INITIAL (decl) = error_mark_node;
10901 bad_specifiers (decl, BSP_FIELD, virtualp,
10902 memfn_quals != TYPE_UNQUALIFIED,
10903 inlinep, friendp, raises != NULL_TREE);
10906 else if (TREE_CODE (type) == FUNCTION_TYPE
10907 || TREE_CODE (type) == METHOD_TYPE)
10909 tree original_name;
10910 int publicp = 0;
10912 if (!unqualified_id)
10913 return error_mark_node;
10915 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
10916 original_name = dname;
10917 else
10918 original_name = unqualified_id;
10920 if (storage_class == sc_auto)
10921 error ("storage class %<auto%> invalid for function %qs", name);
10922 else if (storage_class == sc_register)
10923 error ("storage class %<register%> invalid for function %qs", name);
10924 else if (thread_p)
10926 if (declspecs->gnu_thread_keyword_p)
10927 error ("storage class %<__thread%> invalid for function %qs",
10928 name);
10929 else
10930 error ("storage class %<thread_local%> invalid for function %qs",
10931 name);
10934 if (virt_specifiers)
10935 error ("virt-specifiers in %qs not allowed outside a class definition", name);
10936 /* Function declaration not at top level.
10937 Storage classes other than `extern' are not allowed
10938 and `extern' makes no difference. */
10939 if (! toplevel_bindings_p ()
10940 && (storage_class == sc_static
10941 || decl_spec_seq_has_spec_p (declspecs, ds_inline))
10942 && pedantic)
10944 if (storage_class == sc_static)
10945 pedwarn (input_location, OPT_Wpedantic,
10946 "%<static%> specified invalid for function %qs "
10947 "declared out of global scope", name);
10948 else
10949 pedwarn (input_location, OPT_Wpedantic,
10950 "%<inline%> specifier invalid for function %qs "
10951 "declared out of global scope", name);
10954 if (ctype == NULL_TREE)
10956 if (virtualp)
10958 error ("virtual non-class function %qs", name);
10959 virtualp = 0;
10961 else if (sfk == sfk_constructor
10962 || sfk == sfk_destructor)
10964 error (funcdef_flag
10965 ? G_("%qs defined in a non-class scope")
10966 : G_("%qs declared in a non-class scope"), name);
10967 sfk = sfk_none;
10971 /* Record whether the function is public. */
10972 publicp = (ctype != NULL_TREE
10973 || storage_class != sc_static);
10975 if (late_return_type_p)
10976 TYPE_HAS_LATE_RETURN_TYPE (type) = 1;
10978 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
10979 virtualp, flags, memfn_quals, rqual, raises,
10980 1, friendp,
10981 publicp, inlinep | (2 * constexpr_p), sfk,
10982 funcdef_flag,
10983 template_count, in_namespace, attrlist,
10984 declarator->id_loc);
10985 if (decl == NULL_TREE)
10986 return error_mark_node;
10988 if (staticp == 1)
10990 int invalid_static = 0;
10992 /* Don't allow a static member function in a class, and forbid
10993 declaring main to be static. */
10994 if (TREE_CODE (type) == METHOD_TYPE)
10996 permerror (input_location, "cannot declare member function %qD to have "
10997 "static linkage", decl);
10998 invalid_static = 1;
11000 else if (current_function_decl)
11002 /* FIXME need arm citation */
11003 error ("cannot declare static function inside another function");
11004 invalid_static = 1;
11007 if (invalid_static)
11009 staticp = 0;
11010 storage_class = sc_none;
11014 else
11016 /* It's a variable. */
11018 /* An uninitialized decl with `extern' is a reference. */
11019 decl = grokvardecl (type, dname, unqualified_id,
11020 declspecs,
11021 initialized,
11022 (type_quals & TYPE_QUAL_CONST) != 0,
11023 template_count,
11024 ctype ? ctype : in_namespace);
11025 if (decl == NULL_TREE)
11026 return error_mark_node;
11028 bad_specifiers (decl, BSP_VAR, virtualp,
11029 memfn_quals != TYPE_UNQUALIFIED,
11030 inlinep, friendp, raises != NULL_TREE);
11032 if (ctype)
11034 DECL_CONTEXT (decl) = ctype;
11035 if (staticp == 1)
11037 permerror (input_location, "%<static%> may not be used when defining "
11038 "(as opposed to declaring) a static data member");
11039 staticp = 0;
11040 storage_class = sc_none;
11042 if (storage_class == sc_register && TREE_STATIC (decl))
11044 error ("static member %qD declared %<register%>", decl);
11045 storage_class = sc_none;
11047 if (storage_class == sc_extern && pedantic)
11049 pedwarn (input_location, OPT_Wpedantic,
11050 "cannot explicitly declare member %q#D to have "
11051 "extern linkage", decl);
11052 storage_class = sc_none;
11055 else if (constexpr_p && DECL_EXTERNAL (decl))
11057 error ("declaration of constexpr variable %qD is not a definition",
11058 decl);
11059 constexpr_p = false;
11063 if (storage_class == sc_extern && initialized && !funcdef_flag)
11065 if (toplevel_bindings_p ())
11067 /* It's common practice (and completely valid) to have a const
11068 be initialized and declared extern. */
11069 if (!(type_quals & TYPE_QUAL_CONST))
11070 warning (0, "%qs initialized and declared %<extern%>", name);
11072 else
11074 error ("%qs has both %<extern%> and initializer", name);
11075 return error_mark_node;
11079 /* Record `register' declaration for warnings on &
11080 and in case doing stupid register allocation. */
11082 if (storage_class == sc_register)
11083 DECL_REGISTER (decl) = 1;
11084 else if (storage_class == sc_extern)
11085 DECL_THIS_EXTERN (decl) = 1;
11086 else if (storage_class == sc_static)
11087 DECL_THIS_STATIC (decl) = 1;
11089 /* Set constexpr flag on vars (functions got it in grokfndecl). */
11090 if (constexpr_p && VAR_P (decl))
11091 DECL_DECLARED_CONSTEXPR_P (decl) = true;
11093 /* Record constancy and volatility on the DECL itself . There's
11094 no need to do this when processing a template; we'll do this
11095 for the instantiated declaration based on the type of DECL. */
11096 if (!processing_template_decl)
11097 cp_apply_type_quals_to_decl (type_quals, decl);
11099 return decl;
11103 /* Subroutine of start_function. Ensure that each of the parameter
11104 types (as listed in PARMS) is complete, as is required for a
11105 function definition. */
11107 static void
11108 require_complete_types_for_parms (tree parms)
11110 for (; parms; parms = DECL_CHAIN (parms))
11112 if (dependent_type_p (TREE_TYPE (parms)))
11113 continue;
11114 if (!VOID_TYPE_P (TREE_TYPE (parms))
11115 && complete_type_or_else (TREE_TYPE (parms), parms))
11117 relayout_decl (parms);
11118 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
11120 else
11121 /* grokparms or complete_type_or_else will have already issued
11122 an error. */
11123 TREE_TYPE (parms) = error_mark_node;
11127 /* Returns nonzero if T is a local variable. */
11130 local_variable_p (const_tree t)
11132 if ((VAR_P (t)
11133 /* A VAR_DECL with a context that is a _TYPE is a static data
11134 member. */
11135 && !TYPE_P (CP_DECL_CONTEXT (t))
11136 /* Any other non-local variable must be at namespace scope. */
11137 && !DECL_NAMESPACE_SCOPE_P (t))
11138 || (TREE_CODE (t) == PARM_DECL))
11139 return 1;
11141 return 0;
11144 /* Like local_variable_p, but suitable for use as a tree-walking
11145 function. */
11147 static tree
11148 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
11149 void * /*data*/)
11151 if (local_variable_p (*tp)
11152 && (!DECL_ARTIFICIAL (*tp) || DECL_NAME (*tp) == this_identifier))
11153 return *tp;
11154 else if (TYPE_P (*tp))
11155 *walk_subtrees = 0;
11157 return NULL_TREE;
11160 /* Check that ARG, which is a default-argument expression for a
11161 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
11162 something goes wrong. DECL may also be a _TYPE node, rather than a
11163 DECL, if there is no DECL available. */
11165 tree
11166 check_default_argument (tree decl, tree arg, tsubst_flags_t complain)
11168 tree var;
11169 tree decl_type;
11171 if (TREE_CODE (arg) == DEFAULT_ARG)
11172 /* We get a DEFAULT_ARG when looking at an in-class declaration
11173 with a default argument. Ignore the argument for now; we'll
11174 deal with it after the class is complete. */
11175 return arg;
11177 if (TYPE_P (decl))
11179 decl_type = decl;
11180 decl = NULL_TREE;
11182 else
11183 decl_type = TREE_TYPE (decl);
11185 if (arg == error_mark_node
11186 || decl == error_mark_node
11187 || TREE_TYPE (arg) == error_mark_node
11188 || decl_type == error_mark_node)
11189 /* Something already went wrong. There's no need to check
11190 further. */
11191 return error_mark_node;
11193 /* [dcl.fct.default]
11195 A default argument expression is implicitly converted to the
11196 parameter type. */
11197 ++cp_unevaluated_operand;
11198 perform_implicit_conversion_flags (decl_type, arg, complain,
11199 LOOKUP_IMPLICIT);
11200 --cp_unevaluated_operand;
11202 if (warn_zero_as_null_pointer_constant
11203 && TYPE_PTR_OR_PTRMEM_P (decl_type)
11204 && null_ptr_cst_p (arg)
11205 && (complain & tf_warning)
11206 && maybe_warn_zero_as_null_pointer_constant (arg, input_location))
11207 return nullptr_node;
11209 /* [dcl.fct.default]
11211 Local variables shall not be used in default argument
11212 expressions.
11214 The keyword `this' shall not be used in a default argument of a
11215 member function. */
11216 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
11217 if (var)
11219 if (complain & tf_warning_or_error)
11221 if (DECL_NAME (var) == this_identifier)
11222 permerror (input_location, "default argument %qE uses %qD",
11223 arg, var);
11224 else
11225 error ("default argument %qE uses local variable %qD", arg, var);
11227 return error_mark_node;
11230 /* All is well. */
11231 return arg;
11234 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
11236 static tree
11237 type_is_deprecated (tree type)
11239 enum tree_code code;
11240 if (TREE_DEPRECATED (type))
11241 return type;
11242 if (TYPE_NAME (type)
11243 && TREE_DEPRECATED (TYPE_NAME (type)))
11244 return type;
11246 /* Do warn about using typedefs to a deprecated class. */
11247 if (OVERLOAD_TYPE_P (type) && type != TYPE_MAIN_VARIANT (type))
11248 return type_is_deprecated (TYPE_MAIN_VARIANT (type));
11250 code = TREE_CODE (type);
11252 if (code == POINTER_TYPE || code == REFERENCE_TYPE
11253 || code == OFFSET_TYPE || code == FUNCTION_TYPE
11254 || code == METHOD_TYPE || code == ARRAY_TYPE)
11255 return type_is_deprecated (TREE_TYPE (type));
11257 if (TYPE_PTRMEMFUNC_P (type))
11258 return type_is_deprecated
11259 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type))));
11261 return NULL_TREE;
11264 /* Decode the list of parameter types for a function type.
11265 Given the list of things declared inside the parens,
11266 return a list of types.
11268 If this parameter does not end with an ellipsis, we append
11269 void_list_node.
11271 *PARMS is set to the chain of PARM_DECLs created. */
11273 static tree
11274 grokparms (tree parmlist, tree *parms)
11276 tree result = NULL_TREE;
11277 tree decls = NULL_TREE;
11278 tree parm;
11279 int any_error = 0;
11281 for (parm = parmlist; parm != NULL_TREE; parm = TREE_CHAIN (parm))
11283 tree type = NULL_TREE;
11284 tree init = TREE_PURPOSE (parm);
11285 tree decl = TREE_VALUE (parm);
11286 const char *errmsg;
11288 if (parm == void_list_node)
11289 break;
11291 if (! decl || TREE_TYPE (decl) == error_mark_node)
11292 continue;
11294 type = TREE_TYPE (decl);
11295 if (VOID_TYPE_P (type))
11297 if (same_type_p (type, void_type_node)
11298 && !init
11299 && !DECL_NAME (decl) && !result
11300 && TREE_CHAIN (parm) == void_list_node)
11301 /* DR 577: A parameter list consisting of a single
11302 unnamed parameter of non-dependent type 'void'. */
11303 break;
11304 else if (cv_qualified_p (type))
11305 error_at (DECL_SOURCE_LOCATION (decl),
11306 "invalid use of cv-qualified type %qT in "
11307 "parameter declaration", type);
11308 else
11309 error_at (DECL_SOURCE_LOCATION (decl),
11310 "invalid use of type %<void%> in parameter "
11311 "declaration");
11312 /* It's not a good idea to actually create parameters of
11313 type `void'; other parts of the compiler assume that a
11314 void type terminates the parameter list. */
11315 type = error_mark_node;
11316 TREE_TYPE (decl) = error_mark_node;
11319 if (type != error_mark_node
11320 && TYPE_FOR_JAVA (type)
11321 && MAYBE_CLASS_TYPE_P (type))
11323 error ("parameter %qD has Java class type", decl);
11324 type = error_mark_node;
11325 TREE_TYPE (decl) = error_mark_node;
11326 init = NULL_TREE;
11329 if (type != error_mark_node
11330 && (errmsg = targetm.invalid_parameter_type (type)))
11332 error (errmsg);
11333 type = error_mark_node;
11334 TREE_TYPE (decl) = error_mark_node;
11337 if (type != error_mark_node)
11339 if (deprecated_state != DEPRECATED_SUPPRESS)
11341 tree deptype = type_is_deprecated (type);
11342 if (deptype)
11343 warn_deprecated_use (deptype, NULL_TREE);
11346 /* Top-level qualifiers on the parameters are
11347 ignored for function types. */
11348 type = cp_build_qualified_type (type, 0);
11349 if (TREE_CODE (type) == METHOD_TYPE)
11351 error ("parameter %qD invalidly declared method type", decl);
11352 type = build_pointer_type (type);
11353 TREE_TYPE (decl) = type;
11355 else if (abstract_virtuals_error (decl, type))
11356 any_error = 1; /* Seems like a good idea. */
11357 else if (POINTER_TYPE_P (type))
11359 /* [dcl.fct]/6, parameter types cannot contain pointers
11360 (references) to arrays of unknown bound. */
11361 tree t = TREE_TYPE (type);
11362 int ptr = TYPE_PTR_P (type);
11364 while (1)
11366 if (TYPE_PTR_P (t))
11367 ptr = 1;
11368 else if (TREE_CODE (t) != ARRAY_TYPE)
11369 break;
11370 else if (!TYPE_DOMAIN (t))
11371 break;
11372 t = TREE_TYPE (t);
11374 if (TREE_CODE (t) == ARRAY_TYPE)
11375 error (ptr
11376 ? G_("parameter %qD includes pointer to array of "
11377 "unknown bound %qT")
11378 : G_("parameter %qD includes reference to array of "
11379 "unknown bound %qT"),
11380 decl, t);
11383 if (any_error)
11384 init = NULL_TREE;
11385 else if (init && !processing_template_decl)
11386 init = check_default_argument (decl, init, tf_warning_or_error);
11389 DECL_CHAIN (decl) = decls;
11390 decls = decl;
11391 result = tree_cons (init, type, result);
11393 decls = nreverse (decls);
11394 result = nreverse (result);
11395 if (parm)
11396 result = chainon (result, void_list_node);
11397 *parms = decls;
11399 return result;
11403 /* D is a constructor or overloaded `operator='.
11405 Let T be the class in which D is declared. Then, this function
11406 returns:
11408 -1 if D's is an ill-formed constructor or copy assignment operator
11409 whose first parameter is of type `T'.
11410 0 if D is not a copy constructor or copy assignment
11411 operator.
11412 1 if D is a copy constructor or copy assignment operator whose
11413 first parameter is a reference to non-const qualified T.
11414 2 if D is a copy constructor or copy assignment operator whose
11415 first parameter is a reference to const qualified T.
11417 This function can be used as a predicate. Positive values indicate
11418 a copy constructor and nonzero values indicate a copy assignment
11419 operator. */
11422 copy_fn_p (const_tree d)
11424 tree args;
11425 tree arg_type;
11426 int result = 1;
11428 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
11430 if (TREE_CODE (d) == TEMPLATE_DECL
11431 || (DECL_TEMPLATE_INFO (d)
11432 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
11433 /* Instantiations of template member functions are never copy
11434 functions. Note that member functions of templated classes are
11435 represented as template functions internally, and we must
11436 accept those as copy functions. */
11437 return 0;
11439 args = FUNCTION_FIRST_USER_PARMTYPE (d);
11440 if (!args)
11441 return 0;
11443 arg_type = TREE_VALUE (args);
11444 if (arg_type == error_mark_node)
11445 return 0;
11447 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
11449 /* Pass by value copy assignment operator. */
11450 result = -1;
11452 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
11453 && !TYPE_REF_IS_RVALUE (arg_type)
11454 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
11456 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
11457 result = 2;
11459 else
11460 return 0;
11462 args = TREE_CHAIN (args);
11464 if (args && args != void_list_node && !TREE_PURPOSE (args))
11465 /* There are more non-optional args. */
11466 return 0;
11468 return result;
11471 /* D is a constructor or overloaded `operator='.
11473 Let T be the class in which D is declared. Then, this function
11474 returns true when D is a move constructor or move assignment
11475 operator, false otherwise. */
11477 bool
11478 move_fn_p (const_tree d)
11480 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
11482 if (cxx_dialect == cxx98)
11483 /* There are no move constructors if we are in C++98 mode. */
11484 return false;
11486 if (TREE_CODE (d) == TEMPLATE_DECL
11487 || (DECL_TEMPLATE_INFO (d)
11488 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
11489 /* Instantiations of template member functions are never move
11490 functions. Note that member functions of templated classes are
11491 represented as template functions internally, and we must
11492 accept those as move functions. */
11493 return 0;
11495 return move_signature_fn_p (d);
11498 /* D is a constructor or overloaded `operator='.
11500 Then, this function returns true when D has the same signature as a move
11501 constructor or move assignment operator (because either it is such a
11502 ctor/op= or it is a template specialization with the same signature),
11503 false otherwise. */
11505 bool
11506 move_signature_fn_p (const_tree d)
11508 tree args;
11509 tree arg_type;
11510 bool result = false;
11512 args = FUNCTION_FIRST_USER_PARMTYPE (d);
11513 if (!args)
11514 return 0;
11516 arg_type = TREE_VALUE (args);
11517 if (arg_type == error_mark_node)
11518 return 0;
11520 if (TREE_CODE (arg_type) == REFERENCE_TYPE
11521 && TYPE_REF_IS_RVALUE (arg_type)
11522 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
11523 DECL_CONTEXT (d)))
11524 result = true;
11526 args = TREE_CHAIN (args);
11528 if (args && args != void_list_node && !TREE_PURPOSE (args))
11529 /* There are more non-optional args. */
11530 return false;
11532 return result;
11535 /* Remember any special properties of member function DECL. */
11537 void
11538 grok_special_member_properties (tree decl)
11540 tree class_type;
11542 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
11543 return;
11545 class_type = DECL_CONTEXT (decl);
11546 if (DECL_CONSTRUCTOR_P (decl))
11548 int ctor = copy_fn_p (decl);
11550 if (!DECL_ARTIFICIAL (decl))
11551 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
11553 if (ctor > 0)
11555 /* [class.copy]
11557 A non-template constructor for class X is a copy
11558 constructor if its first parameter is of type X&, const
11559 X&, volatile X& or const volatile X&, and either there
11560 are no other parameters or else all other parameters have
11561 default arguments. */
11562 TYPE_HAS_COPY_CTOR (class_type) = 1;
11563 if (user_provided_p (decl))
11564 TYPE_HAS_COMPLEX_COPY_CTOR (class_type) = 1;
11565 if (ctor > 1)
11566 TYPE_HAS_CONST_COPY_CTOR (class_type) = 1;
11568 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
11569 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
11570 else if (move_fn_p (decl) && user_provided_p (decl))
11571 TYPE_HAS_COMPLEX_MOVE_CTOR (class_type) = 1;
11572 else if (is_list_ctor (decl))
11573 TYPE_HAS_LIST_CTOR (class_type) = 1;
11575 if (DECL_DECLARED_CONSTEXPR_P (decl)
11576 && !copy_fn_p (decl) && !move_fn_p (decl))
11577 TYPE_HAS_CONSTEXPR_CTOR (class_type) = 1;
11579 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
11581 /* [class.copy]
11583 A non-template assignment operator for class X is a copy
11584 assignment operator if its parameter is of type X, X&, const
11585 X&, volatile X& or const volatile X&. */
11587 int assop = copy_fn_p (decl);
11589 if (assop)
11591 TYPE_HAS_COPY_ASSIGN (class_type) = 1;
11592 if (user_provided_p (decl))
11593 TYPE_HAS_COMPLEX_COPY_ASSIGN (class_type) = 1;
11594 if (assop != 1)
11595 TYPE_HAS_CONST_COPY_ASSIGN (class_type) = 1;
11597 else if (move_fn_p (decl) && user_provided_p (decl))
11598 TYPE_HAS_COMPLEX_MOVE_ASSIGN (class_type) = 1;
11600 /* Destructors are handled in check_methods. */
11603 /* Check a constructor DECL has the correct form. Complains
11604 if the class has a constructor of the form X(X). */
11607 grok_ctor_properties (const_tree ctype, const_tree decl)
11609 int ctor_parm = copy_fn_p (decl);
11611 if (ctor_parm < 0)
11613 /* [class.copy]
11615 A declaration of a constructor for a class X is ill-formed if
11616 its first parameter is of type (optionally cv-qualified) X
11617 and either there are no other parameters or else all other
11618 parameters have default arguments.
11620 We *don't* complain about member template instantiations that
11621 have this form, though; they can occur as we try to decide
11622 what constructor to use during overload resolution. Since
11623 overload resolution will never prefer such a constructor to
11624 the non-template copy constructor (which is either explicitly
11625 or implicitly defined), there's no need to worry about their
11626 existence. Theoretically, they should never even be
11627 instantiated, but that's hard to forestall. */
11628 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
11629 ctype, ctype);
11630 return 0;
11633 return 1;
11636 /* An operator with this code is unary, but can also be binary. */
11638 static int
11639 ambi_op_p (enum tree_code code)
11641 return (code == INDIRECT_REF
11642 || code == ADDR_EXPR
11643 || code == UNARY_PLUS_EXPR
11644 || code == NEGATE_EXPR
11645 || code == PREINCREMENT_EXPR
11646 || code == PREDECREMENT_EXPR);
11649 /* An operator with this name can only be unary. */
11651 static int
11652 unary_op_p (enum tree_code code)
11654 return (code == TRUTH_NOT_EXPR
11655 || code == BIT_NOT_EXPR
11656 || code == COMPONENT_REF
11657 || code == TYPE_EXPR);
11660 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
11661 errors are issued for invalid declarations. */
11663 bool
11664 grok_op_properties (tree decl, bool complain)
11666 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
11667 tree argtype;
11668 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
11669 tree name = DECL_NAME (decl);
11670 enum tree_code operator_code;
11671 int arity;
11672 bool ellipsis_p;
11673 tree class_type;
11675 /* Count the number of arguments and check for ellipsis. */
11676 for (argtype = argtypes, arity = 0;
11677 argtype && argtype != void_list_node;
11678 argtype = TREE_CHAIN (argtype))
11679 ++arity;
11680 ellipsis_p = !argtype;
11682 class_type = DECL_CONTEXT (decl);
11683 if (class_type && !CLASS_TYPE_P (class_type))
11684 class_type = NULL_TREE;
11686 if (DECL_CONV_FN_P (decl))
11687 operator_code = TYPE_EXPR;
11688 else
11691 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
11692 if (ansi_opname (CODE) == name) \
11694 operator_code = (CODE); \
11695 break; \
11697 else if (ansi_assopname (CODE) == name) \
11699 operator_code = (CODE); \
11700 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
11701 break; \
11704 #include "operators.def"
11705 #undef DEF_OPERATOR
11707 gcc_unreachable ();
11709 while (0);
11710 gcc_assert (operator_code != MAX_TREE_CODES);
11711 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
11713 if (class_type)
11714 switch (operator_code)
11716 case NEW_EXPR:
11717 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
11718 break;
11720 case DELETE_EXPR:
11721 TYPE_GETS_DELETE (class_type) |= 1;
11722 break;
11724 case VEC_NEW_EXPR:
11725 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
11726 break;
11728 case VEC_DELETE_EXPR:
11729 TYPE_GETS_DELETE (class_type) |= 2;
11730 break;
11732 default:
11733 break;
11736 /* [basic.std.dynamic.allocation]/1:
11738 A program is ill-formed if an allocation function is declared
11739 in a namespace scope other than global scope or declared static
11740 in global scope.
11742 The same also holds true for deallocation functions. */
11743 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
11744 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
11746 if (DECL_NAMESPACE_SCOPE_P (decl))
11748 if (CP_DECL_CONTEXT (decl) != global_namespace)
11750 error ("%qD may not be declared within a namespace", decl);
11751 return false;
11753 else if (!TREE_PUBLIC (decl))
11755 error ("%qD may not be declared as static", decl);
11756 return false;
11758 if (!flag_sized_deallocation && warn_cxx14_compat)
11760 tree parm = FUNCTION_ARG_CHAIN (decl);
11761 if (parm && same_type_p (TREE_VALUE (parm), size_type_node)
11762 && TREE_CHAIN (parm) == void_list_node)
11763 warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wc__14_compat,
11764 "%qD is a usual (non-placement) deallocation "
11765 "function in C++14 (or with -fsized-deallocation)",
11766 decl);
11771 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
11773 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
11774 DECL_IS_OPERATOR_NEW (decl) = 1;
11776 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
11777 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
11778 else
11780 /* An operator function must either be a non-static member function
11781 or have at least one parameter of a class, a reference to a class,
11782 an enumeration, or a reference to an enumeration. 13.4.0.6 */
11783 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
11785 if (operator_code == TYPE_EXPR
11786 || operator_code == CALL_EXPR
11787 || operator_code == COMPONENT_REF
11788 || operator_code == ARRAY_REF
11789 || operator_code == NOP_EXPR)
11791 error ("%qD must be a nonstatic member function", decl);
11792 return false;
11794 else
11796 tree p;
11798 if (DECL_STATIC_FUNCTION_P (decl))
11800 error ("%qD must be either a non-static member "
11801 "function or a non-member function", decl);
11802 return false;
11805 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
11807 tree arg = non_reference (TREE_VALUE (p));
11808 if (arg == error_mark_node)
11809 return false;
11811 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
11812 because these checks are performed even on
11813 template functions. */
11814 if (MAYBE_CLASS_TYPE_P (arg)
11815 || TREE_CODE (arg) == ENUMERAL_TYPE)
11816 break;
11819 if (!p || p == void_list_node)
11821 if (complain)
11822 error ("%qD must have an argument of class or "
11823 "enumerated type", decl);
11824 return false;
11829 /* There are no restrictions on the arguments to an overloaded
11830 "operator ()". */
11831 if (operator_code == CALL_EXPR)
11832 return true;
11834 /* Warn about conversion operators that will never be used. */
11835 if (IDENTIFIER_TYPENAME_P (name)
11836 && ! DECL_TEMPLATE_INFO (decl)
11837 && warn_conversion
11838 /* Warn only declaring the function; there is no need to
11839 warn again about out-of-class definitions. */
11840 && class_type == current_class_type)
11842 tree t = TREE_TYPE (name);
11843 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
11845 if (ref)
11846 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
11848 if (VOID_TYPE_P (t))
11849 warning (OPT_Wconversion,
11851 ? G_("conversion to a reference to void "
11852 "will never use a type conversion operator")
11853 : G_("conversion to void "
11854 "will never use a type conversion operator"));
11855 else if (class_type)
11857 if (t == class_type)
11858 warning (OPT_Wconversion,
11860 ? G_("conversion to a reference to the same type "
11861 "will never use a type conversion operator")
11862 : G_("conversion to the same type "
11863 "will never use a type conversion operator"));
11864 /* Don't force t to be complete here. */
11865 else if (MAYBE_CLASS_TYPE_P (t)
11866 && COMPLETE_TYPE_P (t)
11867 && DERIVED_FROM_P (t, class_type))
11868 warning (OPT_Wconversion,
11870 ? G_("conversion to a reference to a base class "
11871 "will never use a type conversion operator")
11872 : G_("conversion to a base class "
11873 "will never use a type conversion operator"));
11878 if (operator_code == COND_EXPR)
11880 /* 13.4.0.3 */
11881 error ("ISO C++ prohibits overloading operator ?:");
11882 return false;
11884 else if (ellipsis_p)
11886 error ("%qD must not have variable number of arguments", decl);
11887 return false;
11889 else if (ambi_op_p (operator_code))
11891 if (arity == 1)
11892 /* We pick the one-argument operator codes by default, so
11893 we don't have to change anything. */
11895 else if (arity == 2)
11897 /* If we thought this was a unary operator, we now know
11898 it to be a binary operator. */
11899 switch (operator_code)
11901 case INDIRECT_REF:
11902 operator_code = MULT_EXPR;
11903 break;
11905 case ADDR_EXPR:
11906 operator_code = BIT_AND_EXPR;
11907 break;
11909 case UNARY_PLUS_EXPR:
11910 operator_code = PLUS_EXPR;
11911 break;
11913 case NEGATE_EXPR:
11914 operator_code = MINUS_EXPR;
11915 break;
11917 case PREINCREMENT_EXPR:
11918 operator_code = POSTINCREMENT_EXPR;
11919 break;
11921 case PREDECREMENT_EXPR:
11922 operator_code = POSTDECREMENT_EXPR;
11923 break;
11925 default:
11926 gcc_unreachable ();
11929 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
11931 if ((operator_code == POSTINCREMENT_EXPR
11932 || operator_code == POSTDECREMENT_EXPR)
11933 && ! processing_template_decl
11934 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
11936 if (methodp)
11937 error ("postfix %qD must take %<int%> as its argument",
11938 decl);
11939 else
11940 error ("postfix %qD must take %<int%> as its second "
11941 "argument", decl);
11942 return false;
11945 else
11947 if (methodp)
11948 error ("%qD must take either zero or one argument", decl);
11949 else
11950 error ("%qD must take either one or two arguments", decl);
11951 return false;
11954 /* More Effective C++ rule 6. */
11955 if (warn_ecpp
11956 && (operator_code == POSTINCREMENT_EXPR
11957 || operator_code == POSTDECREMENT_EXPR
11958 || operator_code == PREINCREMENT_EXPR
11959 || operator_code == PREDECREMENT_EXPR))
11961 tree arg = TREE_VALUE (argtypes);
11962 tree ret = TREE_TYPE (TREE_TYPE (decl));
11963 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
11964 arg = TREE_TYPE (arg);
11965 arg = TYPE_MAIN_VARIANT (arg);
11966 if (operator_code == PREINCREMENT_EXPR
11967 || operator_code == PREDECREMENT_EXPR)
11969 if (TREE_CODE (ret) != REFERENCE_TYPE
11970 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
11971 arg))
11972 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
11973 build_reference_type (arg));
11975 else
11977 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
11978 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
11982 else if (unary_op_p (operator_code))
11984 if (arity != 1)
11986 if (methodp)
11987 error ("%qD must take %<void%>", decl);
11988 else
11989 error ("%qD must take exactly one argument", decl);
11990 return false;
11993 else /* if (binary_op_p (operator_code)) */
11995 if (arity != 2)
11997 if (methodp)
11998 error ("%qD must take exactly one argument", decl);
11999 else
12000 error ("%qD must take exactly two arguments", decl);
12001 return false;
12004 /* More Effective C++ rule 7. */
12005 if (warn_ecpp
12006 && (operator_code == TRUTH_ANDIF_EXPR
12007 || operator_code == TRUTH_ORIF_EXPR
12008 || operator_code == COMPOUND_EXPR))
12009 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
12010 decl);
12013 /* Effective C++ rule 23. */
12014 if (warn_ecpp
12015 && arity == 2
12016 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
12017 && (operator_code == PLUS_EXPR
12018 || operator_code == MINUS_EXPR
12019 || operator_code == TRUNC_DIV_EXPR
12020 || operator_code == MULT_EXPR
12021 || operator_code == TRUNC_MOD_EXPR)
12022 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
12023 warning (OPT_Weffc__, "%qD should return by value", decl);
12025 /* [over.oper]/8 */
12026 for (; argtypes && argtypes != void_list_node;
12027 argtypes = TREE_CHAIN (argtypes))
12028 if (TREE_PURPOSE (argtypes))
12030 TREE_PURPOSE (argtypes) = NULL_TREE;
12031 if (operator_code == POSTINCREMENT_EXPR
12032 || operator_code == POSTDECREMENT_EXPR)
12034 pedwarn (input_location, OPT_Wpedantic, "%qD cannot have default arguments",
12035 decl);
12037 else
12039 error ("%qD cannot have default arguments", decl);
12040 return false;
12044 return true;
12047 /* Return a string giving the keyword associate with CODE. */
12049 static const char *
12050 tag_name (enum tag_types code)
12052 switch (code)
12054 case record_type:
12055 return "struct";
12056 case class_type:
12057 return "class";
12058 case union_type:
12059 return "union";
12060 case enum_type:
12061 return "enum";
12062 case typename_type:
12063 return "typename";
12064 default:
12065 gcc_unreachable ();
12069 /* Name lookup in an elaborated-type-specifier (after the keyword
12070 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
12071 elaborated-type-specifier is invalid, issue a diagnostic and return
12072 error_mark_node; otherwise, return the *_TYPE to which it referred.
12073 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
12075 tree
12076 check_elaborated_type_specifier (enum tag_types tag_code,
12077 tree decl,
12078 bool allow_template_p)
12080 tree type;
12082 /* In the case of:
12084 struct S { struct S *p; };
12086 name lookup will find the TYPE_DECL for the implicit "S::S"
12087 typedef. Adjust for that here. */
12088 if (DECL_SELF_REFERENCE_P (decl))
12089 decl = TYPE_NAME (TREE_TYPE (decl));
12091 type = TREE_TYPE (decl);
12093 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
12094 is false for this case as well. */
12095 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
12097 error ("using template type parameter %qT after %qs",
12098 type, tag_name (tag_code));
12099 return error_mark_node;
12101 /* Accept template template parameters. */
12102 else if (allow_template_p
12103 && (TREE_CODE (type) == BOUND_TEMPLATE_TEMPLATE_PARM
12104 || TREE_CODE (type) == TEMPLATE_TEMPLATE_PARM))
12106 /* [dcl.type.elab]
12108 If the identifier resolves to a typedef-name or the
12109 simple-template-id resolves to an alias template
12110 specialization, the elaborated-type-specifier is ill-formed.
12112 In other words, the only legitimate declaration to use in the
12113 elaborated type specifier is the implicit typedef created when
12114 the type is declared. */
12115 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
12116 && !DECL_SELF_REFERENCE_P (decl)
12117 && tag_code != typename_type)
12119 if (alias_template_specialization_p (type))
12120 error ("using alias template specialization %qT after %qs",
12121 type, tag_name (tag_code));
12122 else
12123 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
12124 inform (DECL_SOURCE_LOCATION (decl),
12125 "%qD has a previous declaration here", decl);
12126 return error_mark_node;
12128 else if (TREE_CODE (type) != RECORD_TYPE
12129 && TREE_CODE (type) != UNION_TYPE
12130 && tag_code != enum_type
12131 && tag_code != typename_type)
12133 error ("%qT referred to as %qs", type, tag_name (tag_code));
12134 inform (input_location, "%q+T has a previous declaration here", type);
12135 return error_mark_node;
12137 else if (TREE_CODE (type) != ENUMERAL_TYPE
12138 && tag_code == enum_type)
12140 error ("%qT referred to as enum", type);
12141 inform (input_location, "%q+T has a previous declaration here", type);
12142 return error_mark_node;
12144 else if (!allow_template_p
12145 && TREE_CODE (type) == RECORD_TYPE
12146 && CLASSTYPE_IS_TEMPLATE (type))
12148 /* If a class template appears as elaborated type specifier
12149 without a template header such as:
12151 template <class T> class C {};
12152 void f(class C); // No template header here
12154 then the required template argument is missing. */
12155 error ("template argument required for %<%s %T%>",
12156 tag_name (tag_code),
12157 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
12158 return error_mark_node;
12161 return type;
12164 /* Lookup NAME in elaborate type specifier in scope according to
12165 SCOPE and issue diagnostics if necessary.
12166 Return *_TYPE node upon success, NULL_TREE when the NAME is not
12167 found, and ERROR_MARK_NODE for type error. */
12169 static tree
12170 lookup_and_check_tag (enum tag_types tag_code, tree name,
12171 tag_scope scope, bool template_header_p)
12173 tree t;
12174 tree decl;
12175 if (scope == ts_global)
12177 /* First try ordinary name lookup, ignoring hidden class name
12178 injected via friend declaration. */
12179 decl = lookup_name_prefer_type (name, 2);
12180 /* If that fails, the name will be placed in the smallest
12181 non-class, non-function-prototype scope according to 3.3.1/5.
12182 We may already have a hidden name declared as friend in this
12183 scope. So lookup again but not ignoring hidden names.
12184 If we find one, that name will be made visible rather than
12185 creating a new tag. */
12186 if (!decl)
12187 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
12189 else
12190 decl = lookup_type_scope (name, scope);
12192 if (decl
12193 && (DECL_CLASS_TEMPLATE_P (decl)
12194 /* If scope is ts_current we're defining a class, so ignore a
12195 template template parameter. */
12196 || (scope != ts_current
12197 && DECL_TEMPLATE_TEMPLATE_PARM_P (decl))))
12198 decl = DECL_TEMPLATE_RESULT (decl);
12200 if (decl && TREE_CODE (decl) == TYPE_DECL)
12202 /* Look for invalid nested type:
12203 class C {
12204 class C {};
12205 }; */
12206 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
12208 error ("%qD has the same name as the class in which it is "
12209 "declared",
12210 decl);
12211 return error_mark_node;
12214 /* Two cases we need to consider when deciding if a class
12215 template is allowed as an elaborated type specifier:
12216 1. It is a self reference to its own class.
12217 2. It comes with a template header.
12219 For example:
12221 template <class T> class C {
12222 class C *c1; // DECL_SELF_REFERENCE_P is true
12223 class D;
12225 template <class U> class C; // template_header_p is true
12226 template <class T> class C<T>::D {
12227 class C *c2; // DECL_SELF_REFERENCE_P is true
12228 }; */
12230 t = check_elaborated_type_specifier (tag_code,
12231 decl,
12232 template_header_p
12233 | DECL_SELF_REFERENCE_P (decl));
12234 return t;
12236 else if (decl && TREE_CODE (decl) == TREE_LIST)
12238 error ("reference to %qD is ambiguous", name);
12239 print_candidates (decl);
12240 return error_mark_node;
12242 else
12243 return NULL_TREE;
12246 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
12247 Define the tag as a forward-reference if it is not defined.
12249 If a declaration is given, process it here, and report an error if
12250 multiple declarations are not identical.
12252 SCOPE is TS_CURRENT when this is also a definition. Only look in
12253 the current frame for the name (since C++ allows new names in any
12254 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
12255 declaration. Only look beginning from the current scope outward up
12256 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
12258 TEMPLATE_HEADER_P is true when this declaration is preceded by
12259 a set of template parameters. */
12261 static tree
12262 xref_tag_1 (enum tag_types tag_code, tree name,
12263 tag_scope orig_scope, bool template_header_p)
12265 enum tree_code code;
12266 tree t;
12267 tree context = NULL_TREE;
12268 tag_scope scope;
12270 gcc_assert (identifier_p (name));
12272 switch (tag_code)
12274 case record_type:
12275 case class_type:
12276 code = RECORD_TYPE;
12277 break;
12278 case union_type:
12279 code = UNION_TYPE;
12280 break;
12281 case enum_type:
12282 code = ENUMERAL_TYPE;
12283 break;
12284 default:
12285 gcc_unreachable ();
12288 if (orig_scope == ts_lambda)
12289 scope = ts_current;
12290 else
12291 scope = orig_scope;
12293 /* In case of anonymous name, xref_tag is only called to
12294 make type node and push name. Name lookup is not required. */
12295 if (ANON_AGGRNAME_P (name))
12296 t = NULL_TREE;
12297 else
12298 t = lookup_and_check_tag (tag_code, name,
12299 scope, template_header_p);
12301 if (t == error_mark_node)
12302 return error_mark_node;
12304 if (scope != ts_current && t && current_class_type
12305 && template_class_depth (current_class_type)
12306 && template_header_p)
12308 if (TREE_CODE (t) == TEMPLATE_TEMPLATE_PARM)
12309 return t;
12311 /* Since SCOPE is not TS_CURRENT, we are not looking at a
12312 definition of this tag. Since, in addition, we are currently
12313 processing a (member) template declaration of a template
12314 class, we must be very careful; consider:
12316 template <class X>
12317 struct S1
12319 template <class U>
12320 struct S2
12321 { template <class V>
12322 friend struct S1; };
12324 Here, the S2::S1 declaration should not be confused with the
12325 outer declaration. In particular, the inner version should
12326 have a template parameter of level 2, not level 1. This
12327 would be particularly important if the member declaration
12328 were instead:
12330 template <class V = U> friend struct S1;
12332 say, when we should tsubst into `U' when instantiating
12333 S2. On the other hand, when presented with:
12335 template <class T>
12336 struct S1 {
12337 template <class U>
12338 struct S2 {};
12339 template <class U>
12340 friend struct S2;
12343 we must find the inner binding eventually. We
12344 accomplish this by making sure that the new type we
12345 create to represent this declaration has the right
12346 TYPE_CONTEXT. */
12347 context = TYPE_CONTEXT (t);
12348 t = NULL_TREE;
12351 if (! t)
12353 /* If no such tag is yet defined, create a forward-reference node
12354 and record it as the "definition".
12355 When a real declaration of this type is found,
12356 the forward-reference will be altered into a real type. */
12357 if (code == ENUMERAL_TYPE)
12359 error ("use of enum %q#D without previous declaration", name);
12360 return error_mark_node;
12362 else
12364 t = make_class_type (code);
12365 TYPE_CONTEXT (t) = context;
12366 if (orig_scope == ts_lambda)
12367 /* Remember that we're declaring a lambda to avoid bogus errors
12368 in push_template_decl. */
12369 CLASSTYPE_LAMBDA_EXPR (t) = error_mark_node;
12370 t = pushtag (name, t, scope);
12373 else
12375 if (template_header_p && MAYBE_CLASS_TYPE_P (t))
12377 if (!redeclare_class_template (t, current_template_parms))
12378 return error_mark_node;
12380 else if (!processing_template_decl
12381 && CLASS_TYPE_P (t)
12382 && CLASSTYPE_IS_TEMPLATE (t))
12384 error ("redeclaration of %qT as a non-template", t);
12385 error ("previous declaration %q+D", t);
12386 return error_mark_node;
12389 /* Make injected friend class visible. */
12390 if (scope != ts_within_enclosing_non_class
12391 && hidden_name_p (TYPE_NAME (t)))
12393 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
12394 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
12396 if (TYPE_TEMPLATE_INFO (t))
12398 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
12399 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
12404 return t;
12407 /* Wrapper for xref_tag_1. */
12409 tree
12410 xref_tag (enum tag_types tag_code, tree name,
12411 tag_scope scope, bool template_header_p)
12413 tree ret;
12414 bool subtime;
12415 subtime = timevar_cond_start (TV_NAME_LOOKUP);
12416 ret = xref_tag_1 (tag_code, name, scope, template_header_p);
12417 timevar_cond_stop (TV_NAME_LOOKUP, subtime);
12418 return ret;
12422 tree
12423 xref_tag_from_type (tree old, tree id, tag_scope scope)
12425 enum tag_types tag_kind;
12427 if (TREE_CODE (old) == RECORD_TYPE)
12428 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
12429 else
12430 tag_kind = union_type;
12432 if (id == NULL_TREE)
12433 id = TYPE_IDENTIFIER (old);
12435 return xref_tag (tag_kind, id, scope, false);
12438 /* Create the binfo hierarchy for REF with (possibly NULL) base list
12439 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
12440 access_* node, and the TREE_VALUE is the type of the base-class.
12441 Non-NULL TREE_TYPE indicates virtual inheritance.
12443 Returns true if the binfo hierarchy was successfully created,
12444 false if an error was detected. */
12446 bool
12447 xref_basetypes (tree ref, tree base_list)
12449 tree *basep;
12450 tree binfo, base_binfo;
12451 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
12452 unsigned max_bases = 0; /* Maximum direct bases. */
12453 int i;
12454 tree default_access;
12455 tree igo_prev; /* Track Inheritance Graph Order. */
12457 if (ref == error_mark_node)
12458 return false;
12460 /* The base of a derived class is private by default, all others are
12461 public. */
12462 default_access = (TREE_CODE (ref) == RECORD_TYPE
12463 && CLASSTYPE_DECLARED_CLASS (ref)
12464 ? access_private_node : access_public_node);
12466 /* First, make sure that any templates in base-classes are
12467 instantiated. This ensures that if we call ourselves recursively
12468 we do not get confused about which classes are marked and which
12469 are not. */
12470 basep = &base_list;
12471 while (*basep)
12473 tree basetype = TREE_VALUE (*basep);
12475 /* The dependent_type_p call below should really be dependent_scope_p
12476 so that we give a hard error about using an incomplete type as a
12477 base, but we allow it with a pedwarn for backward
12478 compatibility. */
12479 if (processing_template_decl
12480 && CLASS_TYPE_P (basetype) && TYPE_BEING_DEFINED (basetype))
12481 cxx_incomplete_type_diagnostic (NULL_TREE, basetype, DK_PEDWARN);
12482 if (!dependent_type_p (basetype)
12483 && !complete_type_or_else (basetype, NULL))
12484 /* An incomplete type. Remove it from the list. */
12485 *basep = TREE_CHAIN (*basep);
12486 else
12488 max_bases++;
12489 if (TREE_TYPE (*basep))
12490 max_vbases++;
12491 if (CLASS_TYPE_P (basetype))
12492 max_vbases += vec_safe_length (CLASSTYPE_VBASECLASSES (basetype));
12493 basep = &TREE_CHAIN (*basep);
12497 TYPE_MARKED_P (ref) = 1;
12499 /* The binfo slot should be empty, unless this is an (ill-formed)
12500 redefinition. */
12501 if (TYPE_BINFO (ref) && !TYPE_SIZE (ref))
12503 error ("redefinition of %q#T", ref);
12504 return false;
12507 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
12509 binfo = make_tree_binfo (max_bases);
12511 TYPE_BINFO (ref) = binfo;
12512 BINFO_OFFSET (binfo) = size_zero_node;
12513 BINFO_TYPE (binfo) = ref;
12515 /* Apply base-class info set up to the variants of this type. */
12516 fixup_type_variants (ref);
12518 if (max_bases)
12520 vec_alloc (BINFO_BASE_ACCESSES (binfo), max_bases);
12521 /* An aggregate cannot have baseclasses. */
12522 CLASSTYPE_NON_AGGREGATE (ref) = 1;
12524 if (TREE_CODE (ref) == UNION_TYPE)
12526 error ("derived union %qT invalid", ref);
12527 return false;
12531 if (max_bases > 1)
12533 if (TYPE_FOR_JAVA (ref))
12535 error ("Java class %qT cannot have multiple bases", ref);
12536 return false;
12540 if (max_vbases)
12542 vec_alloc (CLASSTYPE_VBASECLASSES (ref), max_vbases);
12544 if (TYPE_FOR_JAVA (ref))
12546 error ("Java class %qT cannot have virtual bases", ref);
12547 return false;
12551 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
12553 tree access = TREE_PURPOSE (base_list);
12554 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
12555 tree basetype = TREE_VALUE (base_list);
12557 if (access == access_default_node)
12558 access = default_access;
12560 if (PACK_EXPANSION_P (basetype))
12561 basetype = PACK_EXPANSION_PATTERN (basetype);
12562 if (TREE_CODE (basetype) == TYPE_DECL)
12563 basetype = TREE_TYPE (basetype);
12564 if (!MAYBE_CLASS_TYPE_P (basetype) || TREE_CODE (basetype) == UNION_TYPE)
12566 error ("base type %qT fails to be a struct or class type",
12567 basetype);
12568 return false;
12571 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
12572 TYPE_FOR_JAVA (ref) = 1;
12574 base_binfo = NULL_TREE;
12575 if (CLASS_TYPE_P (basetype) && !dependent_scope_p (basetype))
12577 base_binfo = TYPE_BINFO (basetype);
12578 /* The original basetype could have been a typedef'd type. */
12579 basetype = BINFO_TYPE (base_binfo);
12581 /* Inherit flags from the base. */
12582 TYPE_HAS_NEW_OPERATOR (ref)
12583 |= TYPE_HAS_NEW_OPERATOR (basetype);
12584 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
12585 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
12586 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
12587 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
12588 CLASSTYPE_DIAMOND_SHAPED_P (ref)
12589 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
12590 CLASSTYPE_REPEATED_BASE_P (ref)
12591 |= CLASSTYPE_REPEATED_BASE_P (basetype);
12594 /* We must do this test after we've seen through a typedef
12595 type. */
12596 if (TYPE_MARKED_P (basetype))
12598 if (basetype == ref)
12599 error ("recursive type %qT undefined", basetype);
12600 else
12601 error ("duplicate base type %qT invalid", basetype);
12602 return false;
12605 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
12606 /* Regenerate the pack expansion for the bases. */
12607 basetype = make_pack_expansion (basetype);
12609 TYPE_MARKED_P (basetype) = 1;
12611 base_binfo = copy_binfo (base_binfo, basetype, ref,
12612 &igo_prev, via_virtual);
12613 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
12614 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
12616 BINFO_BASE_APPEND (binfo, base_binfo);
12617 BINFO_BASE_ACCESS_APPEND (binfo, access);
12620 if (vec_safe_length (CLASSTYPE_VBASECLASSES (ref)) < max_vbases)
12621 /* If we didn't get max_vbases vbases, we must have shared at
12622 least one of them, and are therefore diamond shaped. */
12623 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
12625 /* Unmark all the types. */
12626 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
12627 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
12628 TYPE_MARKED_P (ref) = 0;
12630 /* Now see if we have a repeated base type. */
12631 if (!CLASSTYPE_REPEATED_BASE_P (ref))
12633 for (base_binfo = binfo; base_binfo;
12634 base_binfo = TREE_CHAIN (base_binfo))
12636 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
12638 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
12639 break;
12641 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
12643 for (base_binfo = binfo; base_binfo;
12644 base_binfo = TREE_CHAIN (base_binfo))
12645 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
12646 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
12647 else
12648 break;
12651 return true;
12655 /* Copies the enum-related properties from type SRC to type DST.
12656 Used with the underlying type of an enum and the enum itself. */
12657 static void
12658 copy_type_enum (tree dst, tree src)
12660 tree t;
12661 for (t = dst; t; t = TYPE_NEXT_VARIANT (t))
12663 TYPE_MIN_VALUE (t) = TYPE_MIN_VALUE (src);
12664 TYPE_MAX_VALUE (t) = TYPE_MAX_VALUE (src);
12665 TYPE_SIZE (t) = TYPE_SIZE (src);
12666 TYPE_SIZE_UNIT (t) = TYPE_SIZE_UNIT (src);
12667 SET_TYPE_MODE (dst, TYPE_MODE (src));
12668 TYPE_PRECISION (t) = TYPE_PRECISION (src);
12669 TYPE_ALIGN (t) = TYPE_ALIGN (src);
12670 TYPE_USER_ALIGN (t) = TYPE_USER_ALIGN (src);
12671 TYPE_UNSIGNED (t) = TYPE_UNSIGNED (src);
12675 /* Begin compiling the definition of an enumeration type.
12676 NAME is its name,
12678 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
12680 UNDERLYING_TYPE is the type that will be used as the storage for
12681 the enumeration type. This should be NULL_TREE if no storage type
12682 was specified.
12684 SCOPED_ENUM_P is true if this is a scoped enumeration type.
12686 if IS_NEW is not NULL, gets TRUE iff a new type is created.
12688 Returns the type object, as yet incomplete.
12689 Also records info about it so that build_enumerator
12690 may be used to declare the individual values as they are read. */
12692 tree
12693 start_enum (tree name, tree enumtype, tree underlying_type,
12694 bool scoped_enum_p, bool *is_new)
12696 tree prevtype = NULL_TREE;
12697 gcc_assert (identifier_p (name));
12699 if (is_new)
12700 *is_new = false;
12701 /* [C++0x dcl.enum]p5:
12703 If not explicitly specified, the underlying type of a scoped
12704 enumeration type is int. */
12705 if (!underlying_type && scoped_enum_p)
12706 underlying_type = integer_type_node;
12708 if (underlying_type)
12709 underlying_type = cv_unqualified (underlying_type);
12711 /* If this is the real definition for a previous forward reference,
12712 fill in the contents in the same object that used to be the
12713 forward reference. */
12714 if (!enumtype)
12715 enumtype = lookup_and_check_tag (enum_type, name,
12716 /*tag_scope=*/ts_current,
12717 /*template_header_p=*/false);
12719 /* In case of a template_decl, the only check that should be deferred
12720 to instantiation time is the comparison of underlying types. */
12721 if (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE)
12723 if (scoped_enum_p != SCOPED_ENUM_P (enumtype))
12725 error_at (input_location, "scoped/unscoped mismatch "
12726 "in enum %q#T", enumtype);
12727 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
12728 "previous definition here");
12729 enumtype = error_mark_node;
12731 else if (ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) != !! underlying_type)
12733 error_at (input_location, "underlying type mismatch "
12734 "in enum %q#T", enumtype);
12735 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
12736 "previous definition here");
12737 enumtype = error_mark_node;
12739 else if (underlying_type && ENUM_UNDERLYING_TYPE (enumtype)
12740 && !dependent_type_p (underlying_type)
12741 && !dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype))
12742 && !same_type_p (underlying_type,
12743 ENUM_UNDERLYING_TYPE (enumtype)))
12745 error_at (input_location, "different underlying type "
12746 "in enum %q#T", enumtype);
12747 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
12748 "previous definition here");
12749 underlying_type = NULL_TREE;
12753 if (!enumtype || TREE_CODE (enumtype) != ENUMERAL_TYPE
12754 || processing_template_decl)
12756 /* In case of error, make a dummy enum to allow parsing to
12757 continue. */
12758 if (enumtype == error_mark_node)
12760 name = make_anon_name ();
12761 enumtype = NULL_TREE;
12764 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
12765 of an opaque enum, or an opaque enum of an already defined
12766 enumeration (C++0x only).
12767 In any other case, it'll be NULL_TREE. */
12768 if (!enumtype)
12770 if (is_new)
12771 *is_new = true;
12773 prevtype = enumtype;
12775 /* Do not push the decl more than once, unless we need to
12776 compare underlying types at instantiation time */
12777 if (!enumtype
12778 || TREE_CODE (enumtype) != ENUMERAL_TYPE
12779 || (underlying_type
12780 && dependent_type_p (underlying_type))
12781 || (ENUM_UNDERLYING_TYPE (enumtype)
12782 && dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype))))
12784 enumtype = cxx_make_type (ENUMERAL_TYPE);
12785 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
12787 else
12788 enumtype = xref_tag (enum_type, name, /*tag_scope=*/ts_current,
12789 false);
12791 if (enumtype == error_mark_node)
12792 return error_mark_node;
12794 /* The enum is considered opaque until the opening '{' of the
12795 enumerator list. */
12796 SET_OPAQUE_ENUM_P (enumtype, true);
12797 ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) = !! underlying_type;
12800 SET_SCOPED_ENUM_P (enumtype, scoped_enum_p);
12802 if (underlying_type)
12804 if (CP_INTEGRAL_TYPE_P (underlying_type))
12806 copy_type_enum (enumtype, underlying_type);
12807 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
12809 else if (dependent_type_p (underlying_type))
12810 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
12811 else
12812 error ("underlying type %<%T%> of %<%T%> must be an integral type",
12813 underlying_type, enumtype);
12816 /* If into a template class, the returned enum is always the first
12817 declaration (opaque or not) seen. This way all the references to
12818 this type will be to the same declaration. The following ones are used
12819 only to check for definition errors. */
12820 if (prevtype && processing_template_decl)
12821 return prevtype;
12822 else
12823 return enumtype;
12826 /* After processing and defining all the values of an enumeration type,
12827 install their decls in the enumeration type.
12828 ENUMTYPE is the type object. */
12830 void
12831 finish_enum_value_list (tree enumtype)
12833 tree values;
12834 tree underlying_type;
12835 tree decl;
12836 tree value;
12837 tree minnode, maxnode;
12838 tree t;
12840 bool fixed_underlying_type_p
12841 = ENUM_UNDERLYING_TYPE (enumtype) != NULL_TREE;
12843 /* We built up the VALUES in reverse order. */
12844 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
12846 /* For an enum defined in a template, just set the type of the values;
12847 all further processing is postponed until the template is
12848 instantiated. We need to set the type so that tsubst of a CONST_DECL
12849 works. */
12850 if (processing_template_decl)
12852 for (values = TYPE_VALUES (enumtype);
12853 values;
12854 values = TREE_CHAIN (values))
12855 TREE_TYPE (TREE_VALUE (values)) = enumtype;
12856 return;
12859 /* Determine the minimum and maximum values of the enumerators. */
12860 if (TYPE_VALUES (enumtype))
12862 minnode = maxnode = NULL_TREE;
12864 for (values = TYPE_VALUES (enumtype);
12865 values;
12866 values = TREE_CHAIN (values))
12868 decl = TREE_VALUE (values);
12870 /* [dcl.enum]: Following the closing brace of an enum-specifier,
12871 each enumerator has the type of its enumeration. Prior to the
12872 closing brace, the type of each enumerator is the type of its
12873 initializing value. */
12874 TREE_TYPE (decl) = enumtype;
12876 /* Update the minimum and maximum values, if appropriate. */
12877 value = DECL_INITIAL (decl);
12878 if (value == error_mark_node)
12879 value = integer_zero_node;
12880 /* Figure out what the minimum and maximum values of the
12881 enumerators are. */
12882 if (!minnode)
12883 minnode = maxnode = value;
12884 else if (tree_int_cst_lt (maxnode, value))
12885 maxnode = value;
12886 else if (tree_int_cst_lt (value, minnode))
12887 minnode = value;
12890 else
12891 /* [dcl.enum]
12893 If the enumerator-list is empty, the underlying type is as if
12894 the enumeration had a single enumerator with value 0. */
12895 minnode = maxnode = integer_zero_node;
12897 if (!fixed_underlying_type_p)
12899 /* Compute the number of bits require to represent all values of the
12900 enumeration. We must do this before the type of MINNODE and
12901 MAXNODE are transformed, since tree_int_cst_min_precision relies
12902 on the TREE_TYPE of the value it is passed. */
12903 signop sgn = tree_int_cst_sgn (minnode) >= 0 ? UNSIGNED : SIGNED;
12904 int lowprec = tree_int_cst_min_precision (minnode, sgn);
12905 int highprec = tree_int_cst_min_precision (maxnode, sgn);
12906 int precision = MAX (lowprec, highprec);
12907 unsigned int itk;
12908 bool use_short_enum;
12910 /* Determine the underlying type of the enumeration.
12912 [dcl.enum]
12914 The underlying type of an enumeration is an integral type that
12915 can represent all the enumerator values defined in the
12916 enumeration. It is implementation-defined which integral type is
12917 used as the underlying type for an enumeration except that the
12918 underlying type shall not be larger than int unless the value of
12919 an enumerator cannot fit in an int or unsigned int.
12921 We use "int" or an "unsigned int" as the underlying type, even if
12922 a smaller integral type would work, unless the user has
12923 explicitly requested that we use the smallest possible type. The
12924 user can request that for all enumerations with a command line
12925 flag, or for just one enumeration with an attribute. */
12927 use_short_enum = flag_short_enums
12928 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
12930 for (itk = (use_short_enum ? itk_char : itk_int);
12931 itk != itk_none;
12932 itk++)
12934 underlying_type = integer_types[itk];
12935 if (underlying_type != NULL_TREE
12936 && TYPE_PRECISION (underlying_type) >= precision
12937 && TYPE_SIGN (underlying_type) == sgn)
12938 break;
12940 if (itk == itk_none)
12942 /* DR 377
12944 IF no integral type can represent all the enumerator values, the
12945 enumeration is ill-formed. */
12946 error ("no integral type can represent all of the enumerator values "
12947 "for %qT", enumtype);
12948 precision = TYPE_PRECISION (long_long_integer_type_node);
12949 underlying_type = integer_types[itk_unsigned_long_long];
12952 /* [dcl.enum]
12954 The value of sizeof() applied to an enumeration type, an object
12955 of an enumeration type, or an enumerator, is the value of sizeof()
12956 applied to the underlying type. */
12957 copy_type_enum (enumtype, underlying_type);
12959 /* Compute the minimum and maximum values for the type.
12961 [dcl.enum]
12963 For an enumeration where emin is the smallest enumerator and emax
12964 is the largest, the values of the enumeration are the values of the
12965 underlying type in the range bmin to bmax, where bmin and bmax are,
12966 respectively, the smallest and largest values of the smallest bit-
12967 field that can store emin and emax. */
12969 /* The middle-end currently assumes that types with TYPE_PRECISION
12970 narrower than their underlying type are suitably zero or sign
12971 extended to fill their mode. Similarly, it assumes that the front
12972 end assures that a value of a particular type must be within
12973 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
12975 We used to set these fields based on bmin and bmax, but that led
12976 to invalid assumptions like optimizing away bounds checking. So
12977 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
12978 TYPE_MAX_VALUE to the values for the mode above and only restrict
12979 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
12980 ENUM_UNDERLYING_TYPE (enumtype)
12981 = build_distinct_type_copy (underlying_type);
12982 TYPE_PRECISION (ENUM_UNDERLYING_TYPE (enumtype)) = precision;
12983 set_min_and_max_values_for_integral_type
12984 (ENUM_UNDERLYING_TYPE (enumtype), precision, sgn);
12986 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
12987 if (flag_strict_enums)
12988 set_min_and_max_values_for_integral_type (enumtype, precision, sgn);
12990 else
12991 underlying_type = ENUM_UNDERLYING_TYPE (enumtype);
12993 /* Convert each of the enumerators to the type of the underlying
12994 type of the enumeration. */
12995 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
12997 location_t saved_location;
12999 decl = TREE_VALUE (values);
13000 saved_location = input_location;
13001 input_location = DECL_SOURCE_LOCATION (decl);
13002 if (fixed_underlying_type_p)
13003 /* If the enumeration type has a fixed underlying type, we
13004 already checked all of the enumerator values. */
13005 value = DECL_INITIAL (decl);
13006 else
13007 value = perform_implicit_conversion (underlying_type,
13008 DECL_INITIAL (decl),
13009 tf_warning_or_error);
13010 input_location = saved_location;
13012 /* Do not clobber shared ints. */
13013 value = copy_node (value);
13015 TREE_TYPE (value) = enumtype;
13016 DECL_INITIAL (decl) = value;
13019 /* Fix up all variant types of this enum type. */
13020 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
13021 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
13023 if (at_class_scope_p ()
13024 && COMPLETE_TYPE_P (current_class_type)
13025 && UNSCOPED_ENUM_P (enumtype))
13026 insert_late_enum_def_into_classtype_sorted_fields (enumtype,
13027 current_class_type);
13029 /* Finish debugging output for this type. */
13030 rest_of_type_compilation (enumtype, namespace_bindings_p ());
13033 /* Finishes the enum type. This is called only the first time an
13034 enumeration is seen, be it opaque or odinary.
13035 ENUMTYPE is the type object. */
13037 void
13038 finish_enum (tree enumtype)
13040 if (processing_template_decl)
13042 if (at_function_scope_p ())
13043 add_stmt (build_min (TAG_DEFN, enumtype));
13044 return;
13047 /* If this is a forward declaration, there should not be any variants,
13048 though we can get a variant in the middle of an enum-specifier with
13049 wacky code like 'enum E { e = sizeof(const E*) };' */
13050 gcc_assert (enumtype == TYPE_MAIN_VARIANT (enumtype)
13051 && (TYPE_VALUES (enumtype)
13052 || !TYPE_NEXT_VARIANT (enumtype)));
13055 /* Build and install a CONST_DECL for an enumeration constant of the
13056 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
13057 LOC is the location of NAME.
13058 Assignment of sequential values by default is handled here. */
13060 void
13061 build_enumerator (tree name, tree value, tree enumtype, location_t loc)
13063 tree decl;
13064 tree context;
13065 tree type;
13067 /* scalar_constant_value will pull out this expression, so make sure
13068 it's folded as appropriate. */
13069 if (processing_template_decl)
13070 value = fold_non_dependent_expr (value);
13072 /* If the VALUE was erroneous, pretend it wasn't there; that will
13073 result in the enum being assigned the next value in sequence. */
13074 if (value == error_mark_node)
13075 value = NULL_TREE;
13077 /* Remove no-op casts from the value. */
13078 if (value)
13079 STRIP_TYPE_NOPS (value);
13081 if (! processing_template_decl)
13083 /* Validate and default VALUE. */
13084 if (value != NULL_TREE)
13086 if (!ENUM_UNDERLYING_TYPE (enumtype))
13088 tree tmp_value = build_expr_type_conversion (WANT_INT | WANT_ENUM,
13089 value, true);
13090 if (tmp_value)
13091 value = tmp_value;
13093 else if (! INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (value)))
13094 value = perform_implicit_conversion_flags
13095 (ENUM_UNDERLYING_TYPE (enumtype), value, tf_warning_or_error,
13096 LOOKUP_IMPLICIT | LOOKUP_NO_NARROWING);
13098 if (value == error_mark_node)
13099 value = NULL_TREE;
13101 if (value != NULL_TREE)
13103 value = cxx_constant_value (value);
13105 if (TREE_CODE (value) != INTEGER_CST
13106 || ! INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (value)))
13108 error ("enumerator value for %qD is not an integer constant",
13109 name);
13110 value = NULL_TREE;
13115 /* Default based on previous value. */
13116 if (value == NULL_TREE)
13118 if (TYPE_VALUES (enumtype))
13120 tree prev_value;
13121 bool overflowed;
13123 /* C++03 7.2/4: If no initializer is specified for the first
13124 enumerator, the type is an unspecified integral
13125 type. Otherwise the type is the same as the type of the
13126 initializing value of the preceding enumerator unless the
13127 incremented value is not representable in that type, in
13128 which case the type is an unspecified integral type
13129 sufficient to contain the incremented value. */
13130 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
13131 if (error_operand_p (prev_value))
13132 value = error_mark_node;
13133 else
13135 tree type = TREE_TYPE (prev_value);
13136 signop sgn = TYPE_SIGN (type);
13137 widest_int wi = wi::add (wi::to_widest (prev_value), 1, sgn,
13138 &overflowed);
13139 if (!overflowed)
13141 bool pos = !wi::neg_p (wi, sgn);
13142 if (!wi::fits_to_tree_p (wi, type))
13144 unsigned int itk;
13145 for (itk = itk_int; itk != itk_none; itk++)
13147 type = integer_types[itk];
13148 if (type != NULL_TREE
13149 && (pos || !TYPE_UNSIGNED (type))
13150 && wi::fits_to_tree_p (wi, type))
13151 break;
13153 if (type && cxx_dialect < cxx11
13154 && itk > itk_unsigned_long)
13155 pedwarn (input_location, OPT_Wlong_long, pos ? "\
13156 incremented enumerator value is too large for %<unsigned long%>" : "\
13157 incremented enumerator value is too large for %<long%>");
13159 if (type == NULL_TREE)
13160 overflowed = true;
13161 else
13162 value = wide_int_to_tree (type, wi);
13165 if (overflowed)
13167 error ("overflow in enumeration values at %qD", name);
13168 value = error_mark_node;
13172 else
13173 value = integer_zero_node;
13176 /* Remove no-op casts from the value. */
13177 STRIP_TYPE_NOPS (value);
13179 /* If the underlying type of the enum is fixed, check whether
13180 the enumerator values fits in the underlying type. If it
13181 does not fit, the program is ill-formed [C++0x dcl.enum]. */
13182 if (ENUM_UNDERLYING_TYPE (enumtype)
13183 && value
13184 && TREE_CODE (value) == INTEGER_CST)
13186 if (!int_fits_type_p (value, ENUM_UNDERLYING_TYPE (enumtype)))
13187 error ("enumerator value %E is outside the range of underlying "
13188 "type %<%T%>", value, ENUM_UNDERLYING_TYPE (enumtype));
13190 /* Convert the value to the appropriate type. */
13191 value = convert (ENUM_UNDERLYING_TYPE (enumtype), value);
13195 /* C++ associates enums with global, function, or class declarations. */
13196 context = current_scope ();
13198 /* Build the actual enumeration constant. Note that the enumeration
13199 constants have the underlying type of the enum (if it is fixed)
13200 or the type of their initializer (if the underlying type of the
13201 enum is not fixed):
13203 [ C++0x dcl.enum ]
13205 If the underlying type is fixed, the type of each enumerator
13206 prior to the closing brace is the underlying type; if the
13207 initializing value of an enumerator cannot be represented by
13208 the underlying type, the program is ill-formed. If the
13209 underlying type is not fixed, the type of each enumerator is
13210 the type of its initializing value.
13212 If the underlying type is not fixed, it will be computed by
13213 finish_enum and we will reset the type of this enumerator. Of
13214 course, if we're processing a template, there may be no value. */
13215 type = value ? TREE_TYPE (value) : NULL_TREE;
13217 decl = build_decl (loc, CONST_DECL, name, type);
13219 DECL_CONTEXT (decl) = enumtype;
13220 TREE_CONSTANT (decl) = 1;
13221 TREE_READONLY (decl) = 1;
13222 DECL_INITIAL (decl) = value;
13224 if (context && context == current_class_type && !SCOPED_ENUM_P (enumtype))
13225 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
13226 on the TYPE_FIELDS list for `S'. (That's so that you can say
13227 things like `S::i' later.) */
13228 finish_member_declaration (decl);
13229 else
13230 pushdecl (decl);
13232 /* Add this enumeration constant to the list for this type. */
13233 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
13236 /* Look for an enumerator with the given NAME within the enumeration
13237 type ENUMTYPE. This routine is used primarily for qualified name
13238 lookup into an enumerator in C++0x, e.g.,
13240 enum class Color { Red, Green, Blue };
13242 Color color = Color::Red;
13244 Returns the value corresponding to the enumerator, or
13245 NULL_TREE if no such enumerator was found. */
13246 tree
13247 lookup_enumerator (tree enumtype, tree name)
13249 tree e;
13250 gcc_assert (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE);
13252 e = purpose_member (name, TYPE_VALUES (enumtype));
13253 return e? TREE_VALUE (e) : NULL_TREE;
13257 /* We're defining DECL. Make sure that its type is OK. */
13259 static void
13260 check_function_type (tree decl, tree current_function_parms)
13262 tree fntype = TREE_TYPE (decl);
13263 tree return_type = complete_type (TREE_TYPE (fntype));
13265 /* In a function definition, arg types must be complete. */
13266 require_complete_types_for_parms (current_function_parms);
13268 if (dependent_type_p (return_type)
13269 || type_uses_auto (return_type))
13270 return;
13271 if (!COMPLETE_OR_VOID_TYPE_P (return_type)
13272 || (TYPE_FOR_JAVA (return_type) && MAYBE_CLASS_TYPE_P (return_type)))
13274 tree args = TYPE_ARG_TYPES (fntype);
13276 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
13277 error ("return type %q#T is incomplete", return_type);
13278 else
13279 error ("return type has Java class type %q#T", return_type);
13281 /* Make it return void instead. */
13282 if (TREE_CODE (fntype) == METHOD_TYPE)
13283 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
13284 void_type_node,
13285 TREE_CHAIN (args));
13286 else
13287 fntype = build_function_type (void_type_node, args);
13288 fntype
13289 = build_exception_variant (fntype,
13290 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
13291 fntype = (cp_build_type_attribute_variant
13292 (fntype, TYPE_ATTRIBUTES (TREE_TYPE (decl))));
13293 TREE_TYPE (decl) = fntype;
13295 else
13296 abstract_virtuals_error (decl, TREE_TYPE (fntype));
13299 /* Create the FUNCTION_DECL for a function definition.
13300 DECLSPECS and DECLARATOR are the parts of the declaration;
13301 they describe the function's name and the type it returns,
13302 but twisted together in a fashion that parallels the syntax of C.
13304 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
13305 DECLARATOR is really the DECL for the function we are about to
13306 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
13307 indicating that the function is an inline defined in-class.
13309 This function creates a binding context for the function body
13310 as well as setting up the FUNCTION_DECL in current_function_decl.
13312 For C++, we must first check whether that datum makes any sense.
13313 For example, "class A local_a(1,2);" means that variable local_a
13314 is an aggregate of type A, which should have a constructor
13315 applied to it with the argument list [1, 2].
13317 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
13318 or may be a BLOCK if the function has been defined previously
13319 in this translation unit. On exit, DECL_INITIAL (decl1) will be
13320 error_mark_node if the function has never been defined, or
13321 a BLOCK if the function has been defined somewhere. */
13323 bool
13324 start_preparsed_function (tree decl1, tree attrs, int flags)
13326 tree ctype = NULL_TREE;
13327 tree fntype;
13328 tree restype;
13329 int doing_friend = 0;
13330 cp_binding_level *bl;
13331 tree current_function_parms;
13332 struct c_fileinfo *finfo
13333 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
13334 bool honor_interface;
13336 /* Sanity check. */
13337 gcc_assert (VOID_TYPE_P (TREE_VALUE (void_list_node)));
13338 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
13340 fntype = TREE_TYPE (decl1);
13341 if (TREE_CODE (fntype) == METHOD_TYPE)
13342 ctype = TYPE_METHOD_BASETYPE (fntype);
13344 /* ISO C++ 11.4/5. A friend function defined in a class is in
13345 the (lexical) scope of the class in which it is defined. */
13346 if (!ctype && DECL_FRIEND_P (decl1))
13348 ctype = DECL_FRIEND_CONTEXT (decl1);
13350 /* CTYPE could be null here if we're dealing with a template;
13351 for example, `inline friend float foo()' inside a template
13352 will have no CTYPE set. */
13353 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
13354 ctype = NULL_TREE;
13355 else
13356 doing_friend = 1;
13359 if (DECL_DECLARED_INLINE_P (decl1)
13360 && lookup_attribute ("noinline", attrs))
13361 warning (0, "inline function %q+D given attribute noinline", decl1);
13363 /* Handle gnu_inline attribute. */
13364 if (GNU_INLINE_P (decl1))
13366 DECL_EXTERNAL (decl1) = 1;
13367 DECL_NOT_REALLY_EXTERN (decl1) = 0;
13368 DECL_INTERFACE_KNOWN (decl1) = 1;
13369 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
13372 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
13373 /* This is a constructor, we must ensure that any default args
13374 introduced by this definition are propagated to the clones
13375 now. The clones are used directly in overload resolution. */
13376 adjust_clone_args (decl1);
13378 /* Sometimes we don't notice that a function is a static member, and
13379 build a METHOD_TYPE for it. Fix that up now. */
13380 gcc_assert (!(ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
13381 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE));
13383 /* Set up current_class_type, and enter the scope of the class, if
13384 appropriate. */
13385 if (ctype)
13386 push_nested_class (ctype);
13387 else if (DECL_STATIC_FUNCTION_P (decl1))
13388 push_nested_class (DECL_CONTEXT (decl1));
13390 /* Now that we have entered the scope of the class, we must restore
13391 the bindings for any template parameters surrounding DECL1, if it
13392 is an inline member template. (Order is important; consider the
13393 case where a template parameter has the same name as a field of
13394 the class.) It is not until after this point that
13395 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
13396 if (flags & SF_INCLASS_INLINE)
13397 maybe_begin_member_template_processing (decl1);
13399 /* Effective C++ rule 15. */
13400 if (warn_ecpp
13401 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
13402 && VOID_TYPE_P (TREE_TYPE (fntype)))
13403 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
13405 /* Make the init_value nonzero so pushdecl knows this is not tentative.
13406 error_mark_node is replaced below (in poplevel) with the BLOCK. */
13407 if (!DECL_INITIAL (decl1))
13408 DECL_INITIAL (decl1) = error_mark_node;
13410 /* This function exists in static storage.
13411 (This does not mean `static' in the C sense!) */
13412 TREE_STATIC (decl1) = 1;
13414 /* We must call push_template_decl after current_class_type is set
13415 up. (If we are processing inline definitions after exiting a
13416 class scope, current_class_type will be NULL_TREE until set above
13417 by push_nested_class.) */
13418 if (processing_template_decl)
13420 tree newdecl1 = push_template_decl (decl1);
13421 if (newdecl1 == error_mark_node)
13423 if (ctype || DECL_STATIC_FUNCTION_P (decl1))
13424 pop_nested_class ();
13425 return false;
13427 decl1 = newdecl1;
13430 /* We are now in the scope of the function being defined. */
13431 current_function_decl = decl1;
13433 /* Save the parm names or decls from this function's declarator
13434 where store_parm_decls will find them. */
13435 current_function_parms = DECL_ARGUMENTS (decl1);
13437 /* Make sure the parameter and return types are reasonable. When
13438 you declare a function, these types can be incomplete, but they
13439 must be complete when you define the function. */
13440 check_function_type (decl1, current_function_parms);
13442 /* Build the return declaration for the function. */
13443 restype = TREE_TYPE (fntype);
13445 if (DECL_RESULT (decl1) == NULL_TREE)
13447 tree resdecl;
13449 resdecl = build_decl (input_location, RESULT_DECL, 0, restype);
13450 DECL_ARTIFICIAL (resdecl) = 1;
13451 DECL_IGNORED_P (resdecl) = 1;
13452 DECL_RESULT (decl1) = resdecl;
13454 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
13457 /* Let the user know we're compiling this function. */
13458 announce_function (decl1);
13460 /* Record the decl so that the function name is defined.
13461 If we already have a decl for this name, and it is a FUNCTION_DECL,
13462 use the old decl. */
13463 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
13465 /* A specialization is not used to guide overload resolution. */
13466 if (!DECL_FUNCTION_MEMBER_P (decl1)
13467 && !(DECL_USE_TEMPLATE (decl1) &&
13468 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
13470 tree olddecl = pushdecl (decl1);
13472 if (olddecl == error_mark_node)
13473 /* If something went wrong when registering the declaration,
13474 use DECL1; we have to have a FUNCTION_DECL to use when
13475 parsing the body of the function. */
13477 else
13479 /* Otherwise, OLDDECL is either a previous declaration
13480 of the same function or DECL1 itself. */
13482 if (warn_missing_declarations
13483 && olddecl == decl1
13484 && !DECL_MAIN_P (decl1)
13485 && TREE_PUBLIC (decl1)
13486 && !DECL_DECLARED_INLINE_P (decl1))
13488 tree context;
13490 /* Check whether DECL1 is in an anonymous
13491 namespace. */
13492 for (context = DECL_CONTEXT (decl1);
13493 context;
13494 context = DECL_CONTEXT (context))
13496 if (TREE_CODE (context) == NAMESPACE_DECL
13497 && DECL_NAME (context) == NULL_TREE)
13498 break;
13501 if (context == NULL)
13502 warning (OPT_Wmissing_declarations,
13503 "no previous declaration for %q+D", decl1);
13506 decl1 = olddecl;
13509 else
13511 /* We need to set the DECL_CONTEXT. */
13512 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
13513 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
13515 fntype = TREE_TYPE (decl1);
13516 restype = TREE_TYPE (fntype);
13518 /* If #pragma weak applies, mark the decl appropriately now.
13519 The pragma only applies to global functions. Because
13520 determining whether or not the #pragma applies involves
13521 computing the mangled name for the declaration, we cannot
13522 apply the pragma until after we have merged this declaration
13523 with any previous declarations; if the original declaration
13524 has a linkage specification, that specification applies to
13525 the definition as well, and may affect the mangled name. */
13526 if (DECL_FILE_SCOPE_P (decl1))
13527 maybe_apply_pragma_weak (decl1);
13530 /* Reset this in case the call to pushdecl changed it. */
13531 current_function_decl = decl1;
13533 gcc_assert (DECL_INITIAL (decl1));
13535 /* This function may already have been parsed, in which case just
13536 return; our caller will skip over the body without parsing. */
13537 if (DECL_INITIAL (decl1) != error_mark_node)
13538 return true;
13540 /* Initialize RTL machinery. We cannot do this until
13541 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
13542 even when processing a template; this is how we get
13543 CFUN set up, and our per-function variables initialized.
13544 FIXME factor out the non-RTL stuff. */
13545 bl = current_binding_level;
13546 allocate_struct_function (decl1, processing_template_decl);
13548 /* Initialize the language data structures. Whenever we start
13549 a new function, we destroy temporaries in the usual way. */
13550 cfun->language = ggc_cleared_alloc<language_function> ();
13551 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
13552 current_binding_level = bl;
13554 if (!processing_template_decl && type_uses_auto (restype))
13556 FNDECL_USED_AUTO (decl1) = true;
13557 current_function_auto_return_pattern = restype;
13560 /* Start the statement-tree, start the tree now. */
13561 DECL_SAVED_TREE (decl1) = push_stmt_list ();
13563 /* If we are (erroneously) defining a function that we have already
13564 defined before, wipe out what we knew before. */
13565 if (!DECL_PENDING_INLINE_P (decl1))
13566 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
13568 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
13570 /* We know that this was set up by `grokclassfn'. We do not
13571 wait until `store_parm_decls', since evil parse errors may
13572 never get us to that point. Here we keep the consistency
13573 between `current_class_type' and `current_class_ptr'. */
13574 tree t = DECL_ARGUMENTS (decl1);
13576 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
13577 gcc_assert (TYPE_PTR_P (TREE_TYPE (t)));
13579 cp_function_chain->x_current_class_ref
13580 = cp_build_indirect_ref (t, RO_NULL, tf_warning_or_error);
13581 /* Set this second to avoid shortcut in cp_build_indirect_ref. */
13582 cp_function_chain->x_current_class_ptr = t;
13584 /* Constructors and destructors need to know whether they're "in
13585 charge" of initializing virtual base classes. */
13586 t = DECL_CHAIN (t);
13587 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
13589 current_in_charge_parm = t;
13590 t = DECL_CHAIN (t);
13592 if (DECL_HAS_VTT_PARM_P (decl1))
13594 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
13595 current_vtt_parm = t;
13599 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
13600 /* Implicitly-defined methods (like the
13601 destructor for a class in which no destructor
13602 is explicitly declared) must not be defined
13603 until their definition is needed. So, we
13604 ignore interface specifications for
13605 compiler-generated functions. */
13606 && !DECL_ARTIFICIAL (decl1));
13608 if (processing_template_decl)
13609 /* Don't mess with interface flags. */;
13610 else if (DECL_INTERFACE_KNOWN (decl1))
13612 tree ctx = decl_function_context (decl1);
13614 if (DECL_NOT_REALLY_EXTERN (decl1))
13615 DECL_EXTERNAL (decl1) = 0;
13617 if (ctx != NULL_TREE && vague_linkage_p (ctx))
13618 /* This is a function in a local class in an extern inline
13619 or template function. */
13620 comdat_linkage (decl1);
13622 /* If this function belongs to an interface, it is public.
13623 If it belongs to someone else's interface, it is also external.
13624 This only affects inlines and template instantiations. */
13625 else if (!finfo->interface_unknown && honor_interface)
13627 if (DECL_DECLARED_INLINE_P (decl1)
13628 || DECL_TEMPLATE_INSTANTIATION (decl1))
13630 DECL_EXTERNAL (decl1)
13631 = (finfo->interface_only
13632 || (DECL_DECLARED_INLINE_P (decl1)
13633 && ! flag_implement_inlines
13634 && !DECL_VINDEX (decl1)));
13636 /* For WIN32 we also want to put these in linkonce sections. */
13637 maybe_make_one_only (decl1);
13639 else
13640 DECL_EXTERNAL (decl1) = 0;
13641 DECL_INTERFACE_KNOWN (decl1) = 1;
13642 /* If this function is in an interface implemented in this file,
13643 make sure that the back end knows to emit this function
13644 here. */
13645 if (!DECL_EXTERNAL (decl1))
13646 mark_needed (decl1);
13648 else if (finfo->interface_unknown && finfo->interface_only
13649 && honor_interface)
13651 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
13652 interface, we will have both finfo->interface_unknown and
13653 finfo->interface_only set. In that case, we don't want to
13654 use the normal heuristics because someone will supply a
13655 #pragma implementation elsewhere, and deducing it here would
13656 produce a conflict. */
13657 comdat_linkage (decl1);
13658 DECL_EXTERNAL (decl1) = 0;
13659 DECL_INTERFACE_KNOWN (decl1) = 1;
13660 DECL_DEFER_OUTPUT (decl1) = 1;
13662 else
13664 /* This is a definition, not a reference.
13665 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
13666 if (!GNU_INLINE_P (decl1))
13667 DECL_EXTERNAL (decl1) = 0;
13669 if ((DECL_DECLARED_INLINE_P (decl1)
13670 || DECL_TEMPLATE_INSTANTIATION (decl1))
13671 && ! DECL_INTERFACE_KNOWN (decl1))
13672 DECL_DEFER_OUTPUT (decl1) = 1;
13673 else
13674 DECL_INTERFACE_KNOWN (decl1) = 1;
13677 /* Determine the ELF visibility attribute for the function. We must not
13678 do this before calling "pushdecl", as we must allow "duplicate_decls"
13679 to merge any attributes appropriately. We also need to wait until
13680 linkage is set. */
13681 if (!DECL_CLONED_FUNCTION_P (decl1))
13682 determine_visibility (decl1);
13684 if (!processing_template_decl)
13685 maybe_instantiate_noexcept (decl1);
13687 begin_scope (sk_function_parms, decl1);
13689 ++function_depth;
13691 if (DECL_DESTRUCTOR_P (decl1)
13692 || (DECL_CONSTRUCTOR_P (decl1)
13693 && targetm.cxx.cdtor_returns_this ()))
13695 cdtor_label = build_decl (input_location,
13696 LABEL_DECL, NULL_TREE, NULL_TREE);
13697 DECL_CONTEXT (cdtor_label) = current_function_decl;
13700 start_fname_decls ();
13702 store_parm_decls (current_function_parms);
13704 return true;
13708 /* Like start_preparsed_function, except that instead of a
13709 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
13711 Returns true on success. If the DECLARATOR is not suitable
13712 for a function, we return false, which tells the parser to
13713 skip the entire function. */
13715 bool
13716 start_function (cp_decl_specifier_seq *declspecs,
13717 const cp_declarator *declarator,
13718 tree attrs)
13720 tree decl1;
13722 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
13723 if (decl1 == error_mark_node)
13724 return false;
13725 /* If the declarator is not suitable for a function definition,
13726 cause a syntax error. */
13727 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
13729 error ("invalid function declaration");
13730 return false;
13733 if (DECL_MAIN_P (decl1))
13734 /* main must return int. grokfndecl should have corrected it
13735 (and issued a diagnostic) if the user got it wrong. */
13736 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
13737 integer_type_node));
13739 return start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
13742 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
13743 FN. */
13745 static bool
13746 use_eh_spec_block (tree fn)
13748 return (flag_exceptions && flag_enforce_eh_specs
13749 && !processing_template_decl
13750 && !type_throw_all_p (TREE_TYPE (fn))
13751 /* We insert the EH_SPEC_BLOCK only in the original
13752 function; then, it is copied automatically to the
13753 clones. */
13754 && !DECL_CLONED_FUNCTION_P (fn)
13755 /* Implicitly-generated constructors and destructors have
13756 exception specifications. However, those specifications
13757 are the union of the possible exceptions specified by the
13758 constructors/destructors for bases and members, so no
13759 unallowed exception will ever reach this function. By
13760 not creating the EH_SPEC_BLOCK we save a little memory,
13761 and we avoid spurious warnings about unreachable
13762 code. */
13763 && !DECL_DEFAULTED_FN (fn));
13766 /* Store the parameter declarations into the current function declaration.
13767 This is called after parsing the parameter declarations, before
13768 digesting the body of the function.
13770 Also install to binding contour return value identifier, if any. */
13772 static void
13773 store_parm_decls (tree current_function_parms)
13775 tree fndecl = current_function_decl;
13776 tree parm;
13778 /* This is a chain of any other decls that came in among the parm
13779 declarations. If a parm is declared with enum {foo, bar} x;
13780 then CONST_DECLs for foo and bar are put here. */
13781 tree nonparms = NULL_TREE;
13783 if (current_function_parms)
13785 /* This case is when the function was defined with an ANSI prototype.
13786 The parms already have decls, so we need not do anything here
13787 except record them as in effect
13788 and complain if any redundant old-style parm decls were written. */
13790 tree specparms = current_function_parms;
13791 tree next;
13793 /* Must clear this because it might contain TYPE_DECLs declared
13794 at class level. */
13795 current_binding_level->names = NULL;
13797 /* If we're doing semantic analysis, then we'll call pushdecl
13798 for each of these. We must do them in reverse order so that
13799 they end in the correct forward order. */
13800 specparms = nreverse (specparms);
13802 for (parm = specparms; parm; parm = next)
13804 next = DECL_CHAIN (parm);
13805 if (TREE_CODE (parm) == PARM_DECL)
13807 if (DECL_NAME (parm) == NULL_TREE
13808 || !VOID_TYPE_P (parm))
13809 pushdecl (parm);
13810 else
13811 error ("parameter %qD declared void", parm);
13813 else
13815 /* If we find an enum constant or a type tag,
13816 put it aside for the moment. */
13817 TREE_CHAIN (parm) = NULL_TREE;
13818 nonparms = chainon (nonparms, parm);
13822 /* Get the decls in their original chain order and record in the
13823 function. This is all and only the PARM_DECLs that were
13824 pushed into scope by the loop above. */
13825 DECL_ARGUMENTS (fndecl) = getdecls ();
13827 else
13828 DECL_ARGUMENTS (fndecl) = NULL_TREE;
13830 /* Now store the final chain of decls for the arguments
13831 as the decl-chain of the current lexical scope.
13832 Put the enumerators in as well, at the front so that
13833 DECL_ARGUMENTS is not modified. */
13834 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
13836 if (use_eh_spec_block (current_function_decl))
13837 current_eh_spec_block = begin_eh_spec_block ();
13841 /* We have finished doing semantic analysis on DECL, but have not yet
13842 generated RTL for its body. Save away our current state, so that
13843 when we want to generate RTL later we know what to do. */
13845 static void
13846 save_function_data (tree decl)
13848 struct language_function *f;
13850 /* Save the language-specific per-function data so that we can
13851 get it back when we really expand this function. */
13852 gcc_assert (!DECL_PENDING_INLINE_P (decl));
13854 /* Make a copy. */
13855 f = ggc_alloc<language_function> ();
13856 memcpy (f, cp_function_chain, sizeof (struct language_function));
13857 DECL_SAVED_FUNCTION_DATA (decl) = f;
13859 /* Clear out the bits we don't need. */
13860 f->base.x_stmt_tree.x_cur_stmt_list = NULL;
13861 f->bindings = NULL;
13862 f->x_local_names = NULL;
13863 f->base.local_typedefs = NULL;
13867 /* Set the return value of the constructor (if present). */
13869 static void
13870 finish_constructor_body (void)
13872 tree val;
13873 tree exprstmt;
13875 if (targetm.cxx.cdtor_returns_this ()
13876 && (! TYPE_FOR_JAVA (current_class_type)))
13878 /* Any return from a constructor will end up here. */
13879 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
13881 val = DECL_ARGUMENTS (current_function_decl);
13882 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
13883 DECL_RESULT (current_function_decl), val);
13884 /* Return the address of the object. */
13885 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
13886 add_stmt (exprstmt);
13890 /* Do all the processing for the beginning of a destructor; set up the
13891 vtable pointers and cleanups for bases and members. */
13893 static void
13894 begin_destructor_body (void)
13896 tree compound_stmt;
13898 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
13899 issued an error message. We still want to try to process the
13900 body of the function, but initialize_vtbl_ptrs will crash if
13901 TYPE_BINFO is NULL. */
13902 if (COMPLETE_TYPE_P (current_class_type))
13904 compound_stmt = begin_compound_stmt (0);
13905 /* Make all virtual function table pointers in non-virtual base
13906 classes point to CURRENT_CLASS_TYPE's virtual function
13907 tables. */
13908 initialize_vtbl_ptrs (current_class_ptr);
13909 finish_compound_stmt (compound_stmt);
13911 /* Insert a cleanup to let the back end know that the object is dead
13912 when we exit the destructor, either normally or via exception. */
13913 tree btype = CLASSTYPE_AS_BASE (current_class_type);
13914 tree clobber = build_constructor (btype, NULL);
13915 TREE_THIS_VOLATILE (clobber) = true;
13916 tree bref = build_nop (build_reference_type (btype), current_class_ptr);
13917 bref = convert_from_reference (bref);
13918 tree exprstmt = build2 (MODIFY_EXPR, btype, bref, clobber);
13919 finish_decl_cleanup (NULL_TREE, exprstmt);
13921 /* And insert cleanups for our bases and members so that they
13922 will be properly destroyed if we throw. */
13923 push_base_cleanups ();
13927 /* At the end of every destructor we generate code to delete the object if
13928 necessary. Do that now. */
13930 static void
13931 finish_destructor_body (void)
13933 tree exprstmt;
13935 /* Any return from a destructor will end up here; that way all base
13936 and member cleanups will be run when the function returns. */
13937 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
13939 /* In a virtual destructor, we must call delete. */
13940 if (DECL_VIRTUAL_P (current_function_decl))
13942 tree if_stmt;
13943 tree virtual_size = cxx_sizeof (current_class_type);
13945 /* [class.dtor]
13947 At the point of definition of a virtual destructor (including
13948 an implicit definition), non-placement operator delete shall
13949 be looked up in the scope of the destructor's class and if
13950 found shall be accessible and unambiguous. */
13951 exprstmt = build_op_delete_call (DELETE_EXPR, current_class_ptr,
13952 virtual_size,
13953 /*global_p=*/false,
13954 /*placement=*/NULL_TREE,
13955 /*alloc_fn=*/NULL_TREE,
13956 tf_warning_or_error);
13958 if_stmt = begin_if_stmt ();
13959 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
13960 current_in_charge_parm,
13961 integer_one_node),
13962 if_stmt);
13963 finish_expr_stmt (exprstmt);
13964 finish_then_clause (if_stmt);
13965 finish_if_stmt (if_stmt);
13968 if (targetm.cxx.cdtor_returns_this ())
13970 tree val;
13972 val = DECL_ARGUMENTS (current_function_decl);
13973 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
13974 DECL_RESULT (current_function_decl), val);
13975 /* Return the address of the object. */
13976 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
13977 add_stmt (exprstmt);
13981 /* Do the necessary processing for the beginning of a function body, which
13982 in this case includes member-initializers, but not the catch clauses of
13983 a function-try-block. Currently, this means opening a binding level
13984 for the member-initializers (in a ctor), member cleanups (in a dtor),
13985 and capture proxies (in a lambda operator()). */
13987 tree
13988 begin_function_body (void)
13990 tree stmt;
13992 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
13993 return NULL_TREE;
13995 if (processing_template_decl)
13996 /* Do nothing now. */;
13997 else
13998 /* Always keep the BLOCK node associated with the outermost pair of
13999 curly braces of a function. These are needed for correct
14000 operation of dwarfout.c. */
14001 keep_next_level (true);
14003 stmt = begin_compound_stmt (BCS_FN_BODY);
14005 if (processing_template_decl)
14006 /* Do nothing now. */;
14007 else if (DECL_DESTRUCTOR_P (current_function_decl))
14008 begin_destructor_body ();
14010 return stmt;
14013 /* Do the processing for the end of a function body. Currently, this means
14014 closing out the cleanups for fully-constructed bases and members, and in
14015 the case of the destructor, deleting the object if desired. Again, this
14016 is only meaningful for [cd]tors, since they are the only functions where
14017 there is a significant distinction between the main body and any
14018 function catch clauses. Handling, say, main() return semantics here
14019 would be wrong, as flowing off the end of a function catch clause for
14020 main() would also need to return 0. */
14022 void
14023 finish_function_body (tree compstmt)
14025 if (compstmt == NULL_TREE)
14026 return;
14028 /* Close the block. */
14029 finish_compound_stmt (compstmt);
14031 if (processing_template_decl)
14032 /* Do nothing now. */;
14033 else if (DECL_CONSTRUCTOR_P (current_function_decl))
14034 finish_constructor_body ();
14035 else if (DECL_DESTRUCTOR_P (current_function_decl))
14036 finish_destructor_body ();
14039 /* Given a function, returns the BLOCK corresponding to the outermost level
14040 of curly braces, skipping the artificial block created for constructor
14041 initializers. */
14043 tree
14044 outer_curly_brace_block (tree fndecl)
14046 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
14047 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
14048 /* Skip the artificial function body block. */
14049 block = BLOCK_SUBBLOCKS (block);
14050 return block;
14053 /* If FNDECL is a class's key method, add the class to the list of
14054 keyed classes that should be emitted. */
14056 static void
14057 record_key_method_defined (tree fndecl)
14059 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
14060 && DECL_VIRTUAL_P (fndecl)
14061 && !processing_template_decl)
14063 tree fnclass = DECL_CONTEXT (fndecl);
14064 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
14065 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
14069 /* Subroutine of finish_function.
14070 Save the body of constexpr functions for possible
14071 future compile time evaluation. */
14073 static void
14074 maybe_save_function_definition (tree fun)
14076 if (!processing_template_decl
14077 && DECL_DECLARED_CONSTEXPR_P (fun)
14078 && !cp_function_chain->invalid_constexpr
14079 && !DECL_CLONED_FUNCTION_P (fun))
14080 register_constexpr_fundef (fun, DECL_SAVED_TREE (fun));
14083 /* Finish up a function declaration and compile that function
14084 all the way to assembler language output. The free the storage
14085 for the function definition.
14087 FLAGS is a bitwise or of the following values:
14088 2 - INCLASS_INLINE
14089 We just finished processing the body of an in-class inline
14090 function definition. (This processing will have taken place
14091 after the class definition is complete.) */
14093 tree
14094 finish_function (int flags)
14096 tree fndecl = current_function_decl;
14097 tree fntype, ctype = NULL_TREE;
14098 int inclass_inline = (flags & 2) != 0;
14100 /* When we get some parse errors, we can end up without a
14101 current_function_decl, so cope. */
14102 if (fndecl == NULL_TREE)
14103 return error_mark_node;
14105 if (c_dialect_objc ())
14106 objc_finish_function ();
14108 gcc_assert (!defer_mark_used_calls);
14109 defer_mark_used_calls = true;
14111 record_key_method_defined (fndecl);
14113 fntype = TREE_TYPE (fndecl);
14115 /* TREE_READONLY (fndecl) = 1;
14116 This caused &foo to be of type ptr-to-const-function
14117 which then got a warning when stored in a ptr-to-function variable. */
14119 gcc_assert (building_stmt_list_p ());
14120 /* The current function is being defined, so its DECL_INITIAL should
14121 be set, and unless there's a multiple definition, it should be
14122 error_mark_node. */
14123 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
14125 /* For a cloned function, we've already got all the code we need;
14126 there's no need to add any extra bits. */
14127 if (!DECL_CLONED_FUNCTION_P (fndecl))
14129 /* Make it so that `main' always returns 0 by default. */
14130 if (DECL_MAIN_P (current_function_decl))
14131 finish_return_stmt (integer_zero_node);
14133 if (use_eh_spec_block (current_function_decl))
14134 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
14135 (TREE_TYPE (current_function_decl)),
14136 current_eh_spec_block);
14139 /* If we're saving up tree structure, tie off the function now. */
14140 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
14142 if (fn_contains_cilk_spawn_p (cfun) && !processing_template_decl)
14143 cfun->cilk_frame_decl = insert_cilk_frame (fndecl);
14145 finish_fname_decls ();
14147 /* If this function can't throw any exceptions, remember that. */
14148 if (!processing_template_decl
14149 && !cp_function_chain->can_throw
14150 && !flag_non_call_exceptions
14151 && !decl_replaceable_p (fndecl))
14152 TREE_NOTHROW (fndecl) = 1;
14154 /* This must come after expand_function_end because cleanups might
14155 have declarations (from inline functions) that need to go into
14156 this function's blocks. */
14158 /* If the current binding level isn't the outermost binding level
14159 for this function, either there is a bug, or we have experienced
14160 syntax errors and the statement tree is malformed. */
14161 if (current_binding_level->kind != sk_function_parms)
14163 /* Make sure we have already experienced errors. */
14164 gcc_assert (errorcount);
14166 /* Throw away the broken statement tree and extra binding
14167 levels. */
14168 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
14170 while (current_binding_level->kind != sk_function_parms)
14172 if (current_binding_level->kind == sk_class)
14173 pop_nested_class ();
14174 else
14175 poplevel (0, 0, 0);
14178 poplevel (1, 0, 1);
14180 /* Statements should always be full-expressions at the outermost set
14181 of curly braces for a function. */
14182 gcc_assert (stmts_are_full_exprs_p ());
14184 /* If there are no return statements in a function with auto return type,
14185 the return type is void. But if the declared type is something like
14186 auto*, this is an error. */
14187 if (!processing_template_decl && FNDECL_USED_AUTO (fndecl)
14188 && TREE_TYPE (fntype) == current_function_auto_return_pattern)
14190 if (!is_auto (current_function_auto_return_pattern)
14191 && !current_function_returns_value && !current_function_returns_null)
14193 error ("no return statements in function returning %qT",
14194 current_function_auto_return_pattern);
14195 inform (input_location, "only plain %<auto%> return type can be "
14196 "deduced to %<void%>");
14198 apply_deduced_return_type (fndecl, void_type_node);
14199 fntype = TREE_TYPE (fndecl);
14202 /* Save constexpr function body before it gets munged by
14203 the NRV transformation. */
14204 maybe_save_function_definition (fndecl);
14206 /* Set up the named return value optimization, if we can. Candidate
14207 variables are selected in check_return_expr. */
14208 if (current_function_return_value)
14210 tree r = current_function_return_value;
14211 tree outer;
14213 if (r != error_mark_node
14214 /* This is only worth doing for fns that return in memory--and
14215 simpler, since we don't have to worry about promoted modes. */
14216 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
14217 /* Only allow this for variables declared in the outer scope of
14218 the function so we know that their lifetime always ends with a
14219 return; see g++.dg/opt/nrv6.C. We could be more flexible if
14220 we were to do this optimization in tree-ssa. */
14221 && (outer = outer_curly_brace_block (fndecl))
14222 && chain_member (r, BLOCK_VARS (outer)))
14223 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
14225 current_function_return_value = NULL_TREE;
14228 /* Remember that we were in class scope. */
14229 if (current_class_name)
14230 ctype = current_class_type;
14232 /* Must mark the RESULT_DECL as being in this function. */
14233 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
14235 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
14236 to the FUNCTION_DECL node itself. */
14237 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
14239 /* Save away current state, if appropriate. */
14240 if (!processing_template_decl)
14241 save_function_data (fndecl);
14243 /* Complain if there's just no return statement. */
14244 if (warn_return_type
14245 && !VOID_TYPE_P (TREE_TYPE (fntype))
14246 && !dependent_type_p (TREE_TYPE (fntype))
14247 && !current_function_returns_value && !current_function_returns_null
14248 /* Don't complain if we abort or throw. */
14249 && !current_function_returns_abnormally
14250 /* Don't complain if there's an infinite loop. */
14251 && !current_function_infinite_loop
14252 /* Don't complain if we are declared noreturn. */
14253 && !TREE_THIS_VOLATILE (fndecl)
14254 && !DECL_NAME (DECL_RESULT (fndecl))
14255 && !TREE_NO_WARNING (fndecl)
14256 /* Structor return values (if any) are set by the compiler. */
14257 && !DECL_CONSTRUCTOR_P (fndecl)
14258 && !DECL_DESTRUCTOR_P (fndecl)
14259 && targetm.warn_func_return (fndecl))
14261 warning (OPT_Wreturn_type,
14262 "no return statement in function returning non-void");
14263 TREE_NO_WARNING (fndecl) = 1;
14266 /* Store the end of the function, so that we get good line number
14267 info for the epilogue. */
14268 cfun->function_end_locus = input_location;
14270 /* Complain about parameters that are only set, but never otherwise used. */
14271 if (warn_unused_but_set_parameter
14272 && !processing_template_decl
14273 && errorcount == unused_but_set_errorcount
14274 && !DECL_CLONED_FUNCTION_P (fndecl))
14276 tree decl;
14278 for (decl = DECL_ARGUMENTS (fndecl);
14279 decl;
14280 decl = DECL_CHAIN (decl))
14281 if (TREE_USED (decl)
14282 && TREE_CODE (decl) == PARM_DECL
14283 && !DECL_READ_P (decl)
14284 && DECL_NAME (decl)
14285 && !DECL_ARTIFICIAL (decl)
14286 && !TREE_NO_WARNING (decl)
14287 && !DECL_IN_SYSTEM_HEADER (decl)
14288 && TREE_TYPE (decl) != error_mark_node
14289 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
14290 && (!CLASS_TYPE_P (TREE_TYPE (decl))
14291 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
14292 warning (OPT_Wunused_but_set_parameter,
14293 "parameter %q+D set but not used", decl);
14294 unused_but_set_errorcount = errorcount;
14297 /* Complain about locally defined typedefs that are not used in this
14298 function. */
14299 maybe_warn_unused_local_typedefs ();
14301 /* Genericize before inlining. */
14302 if (!processing_template_decl)
14304 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
14305 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl);
14306 cp_genericize (fndecl);
14307 /* Clear out the bits we don't need. */
14308 f->x_current_class_ptr = NULL;
14309 f->x_current_class_ref = NULL;
14310 f->x_eh_spec_block = NULL;
14311 f->x_in_charge_parm = NULL;
14312 f->x_vtt_parm = NULL;
14313 f->x_return_value = NULL;
14314 f->bindings = NULL;
14315 f->extern_decl_map = NULL;
14316 f->infinite_loops = NULL;
14318 /* Clear out the bits we don't need. */
14319 local_names = NULL;
14321 /* We're leaving the context of this function, so zap cfun. It's still in
14322 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
14323 set_cfun (NULL);
14324 current_function_decl = NULL;
14326 /* If this is an in-class inline definition, we may have to pop the
14327 bindings for the template parameters that we added in
14328 maybe_begin_member_template_processing when start_function was
14329 called. */
14330 if (inclass_inline)
14331 maybe_end_member_template_processing ();
14333 /* Leave the scope of the class. */
14334 if (ctype)
14335 pop_nested_class ();
14337 --function_depth;
14339 /* Clean up. */
14340 current_function_decl = NULL_TREE;
14342 defer_mark_used_calls = false;
14343 if (deferred_mark_used_calls)
14345 unsigned int i;
14346 tree decl;
14348 FOR_EACH_VEC_SAFE_ELT (deferred_mark_used_calls, i, decl)
14349 mark_used (decl);
14350 vec_free (deferred_mark_used_calls);
14353 return fndecl;
14356 /* Create the FUNCTION_DECL for a function definition.
14357 DECLSPECS and DECLARATOR are the parts of the declaration;
14358 they describe the return type and the name of the function,
14359 but twisted together in a fashion that parallels the syntax of C.
14361 This function creates a binding context for the function body
14362 as well as setting up the FUNCTION_DECL in current_function_decl.
14364 Returns a FUNCTION_DECL on success.
14366 If the DECLARATOR is not suitable for a function (it defines a datum
14367 instead), we return 0, which tells yyparse to report a parse error.
14369 May return void_type_node indicating that this method is actually
14370 a friend. See grokfield for more details.
14372 Came here with a `.pushlevel' .
14374 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
14375 CHANGES TO CODE IN `grokfield'. */
14377 tree
14378 grokmethod (cp_decl_specifier_seq *declspecs,
14379 const cp_declarator *declarator, tree attrlist)
14381 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
14382 &attrlist);
14384 if (fndecl == error_mark_node)
14385 return error_mark_node;
14387 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
14389 error ("invalid member function declaration");
14390 return error_mark_node;
14393 if (attrlist)
14394 cplus_decl_attributes (&fndecl, attrlist, 0);
14396 /* Pass friends other than inline friend functions back. */
14397 if (fndecl == void_type_node)
14398 return fndecl;
14400 if (DECL_IN_AGGR_P (fndecl))
14402 if (DECL_CLASS_SCOPE_P (fndecl))
14403 error ("%qD is already defined in class %qT", fndecl,
14404 DECL_CONTEXT (fndecl));
14405 return error_mark_node;
14408 check_template_shadow (fndecl);
14410 DECL_COMDAT (fndecl) = 1;
14411 DECL_DECLARED_INLINE_P (fndecl) = 1;
14412 DECL_NO_INLINE_WARNING_P (fndecl) = 1;
14414 /* We process method specializations in finish_struct_1. */
14415 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
14417 fndecl = push_template_decl (fndecl);
14418 if (fndecl == error_mark_node)
14419 return fndecl;
14422 if (! DECL_FRIEND_P (fndecl))
14424 if (DECL_CHAIN (fndecl))
14426 fndecl = copy_node (fndecl);
14427 TREE_CHAIN (fndecl) = NULL_TREE;
14431 cp_finish_decl (fndecl, NULL_TREE, false, NULL_TREE, 0);
14433 DECL_IN_AGGR_P (fndecl) = 1;
14434 return fndecl;
14438 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
14439 we can lay it out later, when and if its type becomes complete.
14441 Also handle constexpr variables where the initializer involves
14442 an unlowered PTRMEM_CST because the class isn't complete yet. */
14444 void
14445 maybe_register_incomplete_var (tree var)
14447 gcc_assert (VAR_P (var));
14449 /* Keep track of variables with incomplete types. */
14450 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
14451 && DECL_EXTERNAL (var))
14453 tree inner_type = TREE_TYPE (var);
14455 while (TREE_CODE (inner_type) == ARRAY_TYPE)
14456 inner_type = TREE_TYPE (inner_type);
14457 inner_type = TYPE_MAIN_VARIANT (inner_type);
14459 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
14460 /* RTTI TD entries are created while defining the type_info. */
14461 || (TYPE_LANG_SPECIFIC (inner_type)
14462 && TYPE_BEING_DEFINED (inner_type)))
14464 incomplete_var iv = {var, inner_type};
14465 vec_safe_push (incomplete_vars, iv);
14467 else if (!(DECL_LANG_SPECIFIC (var) && DECL_TEMPLATE_INFO (var))
14468 && decl_constant_var_p (var)
14469 && (TYPE_PTRMEM_P (inner_type) || CLASS_TYPE_P (inner_type)))
14471 /* When the outermost open class is complete we can resolve any
14472 pointers-to-members. */
14473 tree context = outermost_open_class ();
14474 incomplete_var iv = {var, context};
14475 vec_safe_push (incomplete_vars, iv);
14480 /* Called when a class type (given by TYPE) is defined. If there are
14481 any existing VAR_DECLs whose type has been completed by this
14482 declaration, update them now. */
14484 void
14485 complete_vars (tree type)
14487 unsigned ix;
14488 incomplete_var *iv;
14490 for (ix = 0; vec_safe_iterate (incomplete_vars, ix, &iv); )
14492 if (same_type_p (type, iv->incomplete_type))
14494 tree var = iv->decl;
14495 tree type = TREE_TYPE (var);
14497 if (TYPE_MAIN_VARIANT (strip_array_types (type))
14498 == iv->incomplete_type)
14500 /* Complete the type of the variable. The VAR_DECL itself
14501 will be laid out in expand_expr. */
14502 complete_type (type);
14503 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
14506 if (DECL_INITIAL (var)
14507 && decl_constant_var_p (var))
14508 DECL_INITIAL (var) = cplus_expand_constant (DECL_INITIAL (var));
14510 /* Remove this entry from the list. */
14511 incomplete_vars->unordered_remove (ix);
14513 else
14514 ix++;
14517 /* Check for pending declarations which may have abstract type. */
14518 complete_type_check_abstract (type);
14521 /* If DECL is of a type which needs a cleanup, build and return an
14522 expression to perform that cleanup here. Return NULL_TREE if no
14523 cleanup need be done. */
14525 tree
14526 cxx_maybe_build_cleanup (tree decl, tsubst_flags_t complain)
14528 tree type;
14529 tree attr;
14530 tree cleanup;
14532 /* Assume no cleanup is required. */
14533 cleanup = NULL_TREE;
14535 if (error_operand_p (decl))
14536 return cleanup;
14538 /* Handle "__attribute__((cleanup))". We run the cleanup function
14539 before the destructor since the destructor is what actually
14540 terminates the lifetime of the object. */
14541 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
14542 if (attr)
14544 tree id;
14545 tree fn;
14546 tree arg;
14548 /* Get the name specified by the user for the cleanup function. */
14549 id = TREE_VALUE (TREE_VALUE (attr));
14550 /* Look up the name to find the cleanup function to call. It is
14551 important to use lookup_name here because that is what is
14552 used in c-common.c:handle_cleanup_attribute when performing
14553 initial checks on the attribute. Note that those checks
14554 include ensuring that the function found is not an overloaded
14555 function, or an object with an overloaded call operator,
14556 etc.; we can rely on the fact that the function found is an
14557 ordinary FUNCTION_DECL. */
14558 fn = lookup_name (id);
14559 arg = build_address (decl);
14560 mark_used (decl);
14561 cleanup = cp_build_function_call_nary (fn, complain, arg, NULL_TREE);
14562 if (cleanup == error_mark_node)
14563 return error_mark_node;
14565 /* Handle ordinary C++ destructors. */
14566 type = TREE_TYPE (decl);
14567 if (type_build_dtor_call (type))
14569 int flags = LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR;
14570 tree addr;
14571 tree call;
14573 if (TREE_CODE (type) == ARRAY_TYPE)
14574 addr = decl;
14575 else
14576 addr = build_address (decl);
14578 call = build_delete (TREE_TYPE (addr), addr,
14579 sfk_complete_destructor, flags, 0, complain);
14580 if (call == error_mark_node)
14581 cleanup = error_mark_node;
14582 else if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
14583 /* Discard the call. */;
14584 else if (cleanup)
14585 cleanup = cp_build_compound_expr (cleanup, call, complain);
14586 else
14587 cleanup = call;
14590 /* build_delete sets the location of the destructor call to the
14591 current location, even though the destructor is going to be
14592 called later, at the end of the current scope. This can lead to
14593 a "jumpy" behaviour for users of debuggers when they step around
14594 the end of the block. So let's unset the location of the
14595 destructor call instead. */
14596 if (cleanup != NULL && EXPR_P (cleanup))
14597 SET_EXPR_LOCATION (cleanup, UNKNOWN_LOCATION);
14599 if (cleanup
14600 && !lookup_attribute ("warn_unused", TYPE_ATTRIBUTES (TREE_TYPE (decl))))
14601 /* Treat objects with destructors as used; the destructor may do
14602 something substantive. */
14603 mark_used (decl);
14605 return cleanup;
14609 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
14610 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
14611 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
14613 tree
14614 static_fn_type (tree memfntype)
14616 tree fntype;
14617 tree args;
14619 if (TYPE_PTRMEMFUNC_P (memfntype))
14620 memfntype = TYPE_PTRMEMFUNC_FN_TYPE (memfntype);
14621 if (POINTER_TYPE_P (memfntype)
14622 || TREE_CODE (memfntype) == FUNCTION_DECL)
14623 memfntype = TREE_TYPE (memfntype);
14624 if (TREE_CODE (memfntype) == FUNCTION_TYPE)
14625 return memfntype;
14626 gcc_assert (TREE_CODE (memfntype) == METHOD_TYPE);
14627 args = TYPE_ARG_TYPES (memfntype);
14628 cp_ref_qualifier rqual = type_memfn_rqual (memfntype);
14629 fntype = build_function_type (TREE_TYPE (memfntype), TREE_CHAIN (args));
14630 fntype = apply_memfn_quals (fntype, type_memfn_quals (memfntype), rqual);
14631 fntype = (cp_build_type_attribute_variant
14632 (fntype, TYPE_ATTRIBUTES (memfntype)));
14633 fntype = (build_exception_variant
14634 (fntype, TYPE_RAISES_EXCEPTIONS (memfntype)));
14635 if (TYPE_HAS_LATE_RETURN_TYPE (memfntype))
14636 TYPE_HAS_LATE_RETURN_TYPE (fntype) = 1;
14637 return fntype;
14640 /* DECL was originally constructed as a non-static member function,
14641 but turned out to be static. Update it accordingly. */
14643 void
14644 revert_static_member_fn (tree decl)
14646 tree stype = static_fn_type (decl);
14647 cp_cv_quals quals = type_memfn_quals (stype);
14648 cp_ref_qualifier rqual = type_memfn_rqual (stype);
14650 if (quals != TYPE_UNQUALIFIED || rqual != REF_QUAL_NONE)
14651 stype = apply_memfn_quals (stype, TYPE_UNQUALIFIED, REF_QUAL_NONE);
14653 TREE_TYPE (decl) = stype;
14655 if (DECL_ARGUMENTS (decl))
14656 DECL_ARGUMENTS (decl) = DECL_CHAIN (DECL_ARGUMENTS (decl));
14657 DECL_STATIC_FUNCTION_P (decl) = 1;
14660 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
14661 one of the language-independent trees. */
14663 enum cp_tree_node_structure_enum
14664 cp_tree_node_structure (union lang_tree_node * t)
14666 switch (TREE_CODE (&t->generic))
14668 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
14669 case DEFERRED_NOEXCEPT: return TS_CP_DEFERRED_NOEXCEPT;
14670 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
14671 case OVERLOAD: return TS_CP_OVERLOAD;
14672 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
14673 case PTRMEM_CST: return TS_CP_PTRMEM;
14674 case BASELINK: return TS_CP_BASELINK;
14675 case TEMPLATE_DECL: return TS_CP_TEMPLATE_DECL;
14676 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
14677 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
14678 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
14679 case LAMBDA_EXPR: return TS_CP_LAMBDA_EXPR;
14680 case TEMPLATE_INFO: return TS_CP_TEMPLATE_INFO;
14681 case USERDEF_LITERAL: return TS_CP_USERDEF_LITERAL;
14682 default: return TS_CP_GENERIC;
14686 /* Build the void_list_node (void_type_node having been created). */
14687 tree
14688 build_void_list_node (void)
14690 tree t = build_tree_list (NULL_TREE, void_type_node);
14691 return t;
14694 bool
14695 cp_missing_noreturn_ok_p (tree decl)
14697 /* A missing noreturn is ok for the `main' function. */
14698 return DECL_MAIN_P (decl);
14701 /* Return the decl used to identify the COMDAT group into which DECL should
14702 be placed. */
14704 tree
14705 cxx_comdat_group (tree decl)
14707 /* Virtual tables, construction virtual tables, and virtual table
14708 tables all go in a single COMDAT group, named after the primary
14709 virtual table. */
14710 if (VAR_P (decl) && DECL_VTABLE_OR_VTT_P (decl))
14711 decl = CLASSTYPE_VTABLES (DECL_CONTEXT (decl));
14712 /* For all other DECLs, the COMDAT group is the mangled name of the
14713 declaration itself. */
14714 else
14716 while (DECL_THUNK_P (decl))
14718 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
14719 into the same section as the target function. In that case
14720 we must return target's name. */
14721 tree target = THUNK_TARGET (decl);
14722 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
14723 && DECL_SECTION_NAME (target) != NULL
14724 && DECL_ONE_ONLY (target))
14725 decl = target;
14726 else
14727 break;
14731 return decl;
14734 /* Returns the return type for FN as written by the user, which may include
14735 a placeholder for a deduced return type. */
14737 tree
14738 fndecl_declared_return_type (tree fn)
14740 fn = STRIP_TEMPLATE (fn);
14741 if (FNDECL_USED_AUTO (fn))
14743 struct language_function *f = NULL;
14744 if (DECL_STRUCT_FUNCTION (fn))
14745 f = DECL_STRUCT_FUNCTION (fn)->language;
14746 if (f == NULL)
14747 f = DECL_SAVED_FUNCTION_DATA (fn);
14748 return f->x_auto_return_pattern;
14750 return TREE_TYPE (TREE_TYPE (fn));
14753 /* Returns true iff DECL was declared with an auto return type and it has
14754 not yet been deduced to a real type. */
14756 bool
14757 undeduced_auto_decl (tree decl)
14759 if (cxx_dialect < cxx14)
14760 return false;
14761 return type_uses_auto (TREE_TYPE (decl));
14764 /* Complain if DECL has an undeduced return type. */
14766 void
14767 require_deduced_type (tree decl)
14769 if (undeduced_auto_decl (decl))
14770 error ("use of %qD before deduction of %<auto%>", decl);
14773 #include "gt-cp-decl.h"