1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988-2015 Free Software Foundation, Inc.
3 Contributed by Michael Tiemann (tiemann@cygnus.com)
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3, or (at your option)
12 GCC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
22 /* Process declarations and symbol lookup for C++ front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
31 #include "coretypes.h"
36 #include "double-int.h"
43 #include "tree-hasher.h"
44 #include "stringpool.h"
45 #include "stor-layout.h"
51 #include "tree-iterator.h"
52 #include "tree-inline.h"
59 #include "c-family/c-common.h"
60 #include "c-family/c-objc.h"
61 #include "c-family/c-pragma.h"
62 #include "c-family/c-target.h"
63 #include "c-family/c-ubsan.h"
64 #include "diagnostic.h"
68 #include "splay-tree.h"
72 #include "plugin-api.h"
73 #include "hard-reg-set.h"
82 /* Possible cases of bad specifiers type used by bad_specifiers. */
84 BSP_VAR, /* variable */
85 BSP_PARM, /* parameter */
90 static tree grokparms (tree parmlist, tree *);
91 static const char *redeclaration_error_message (tree, tree);
93 static int decl_jump_unsafe (tree);
94 static void require_complete_types_for_parms (tree);
95 static int ambi_op_p (enum tree_code);
96 static int unary_op_p (enum tree_code);
97 static void push_local_name (tree);
98 static tree grok_reference_init (tree, tree, tree, int);
99 static tree grokvardecl (tree, tree, tree, const cp_decl_specifier_seq *,
100 int, int, int, tree);
101 static int check_static_variable_definition (tree, tree);
102 static void record_unknown_type (tree, const char *);
103 static tree builtin_function_1 (tree, tree, bool);
104 static int member_function_or_else (tree, tree, enum overload_flags);
105 static void bad_specifiers (tree, enum bad_spec_place, int, int, int, int,
107 static void check_for_uninitialized_const_var (tree);
108 static tree local_variable_p_walkfn (tree *, int *, void *);
109 static tree record_builtin_java_type (const char *, int);
110 static const char *tag_name (enum tag_types);
111 static tree lookup_and_check_tag (enum tag_types, tree, tag_scope, bool);
112 static int walk_namespaces_r (tree, walk_namespaces_fn, void *);
113 static void maybe_deduce_size_from_array_init (tree, tree);
114 static void layout_var_decl (tree);
115 static tree check_initializer (tree, tree, int, vec<tree, va_gc> **);
116 static void make_rtl_for_nonlocal_decl (tree, tree, const char *);
117 static void save_function_data (tree);
118 static void copy_type_enum (tree , tree);
119 static void check_function_type (tree, tree);
120 static void finish_constructor_body (void);
121 static void begin_destructor_body (void);
122 static void finish_destructor_body (void);
123 static void record_key_method_defined (tree);
124 static tree create_array_type_for_decl (tree, tree, tree);
125 static tree get_atexit_node (void);
126 static tree get_dso_handle_node (void);
127 static tree start_cleanup_fn (void);
128 static void end_cleanup_fn (void);
129 static tree cp_make_fname_decl (location_t, tree, int);
130 static void initialize_predefined_identifiers (void);
131 static tree check_special_function_return_type
132 (special_function_kind, tree, tree);
133 static tree push_cp_library_fn (enum tree_code, tree, int);
134 static tree build_cp_library_fn (tree, enum tree_code, tree, int);
135 static void store_parm_decls (tree);
136 static void initialize_local_var (tree, tree);
137 static void expand_static_init (tree, tree);
139 /* The following symbols are subsumed in the cp_global_trees array, and
140 listed here individually for documentation purposes.
143 tree wchar_decl_node;
145 tree vtable_entry_type;
146 tree delta_type_node;
147 tree __t_desc_type_node;
149 tree class_type_node;
150 tree unknown_type_node;
152 Array type `vtable_entry_type[]'
155 tree vtbl_ptr_type_node;
162 A FUNCTION_DECL which can call `abort'. Not necessarily the
163 one that the user will declare, but sufficient to be called
164 by routines that want to abort the program.
169 tree type_info_type_node, tinfo_decl_id, tinfo_decl_type;
170 tree tinfo_var_id; */
172 tree cp_global_trees[CPTI_MAX];
174 /* Indicates that there is a type value in some namespace, although
175 that is not necessarily in scope at the moment. */
177 tree global_type_node;
179 /* The node that holds the "name" of the global scope. */
180 tree global_scope_name;
182 #define local_names cp_function_chain->x_local_names
184 /* A list of objects which have constructors or destructors
185 which reside in the global scope. The decl is stored in
186 the TREE_VALUE slot and the initializer is stored
187 in the TREE_PURPOSE slot. */
188 tree static_aggregates;
190 /* Like static_aggregates, but for thread_local variables. */
195 /* A node for the integer constant 2. */
197 tree integer_two_node;
199 /* Used only for jumps to as-yet undefined labels, since jumps to
200 defined labels can have their validity checked immediately. */
202 struct GTY((chain_next ("%h.next"))) named_label_use_entry {
203 struct named_label_use_entry *next;
204 /* The binding level to which this entry is *currently* attached.
205 This is initially the binding level in which the goto appeared,
206 but is modified as scopes are closed. */
207 cp_binding_level *binding_level;
208 /* The head of the names list that was current when the goto appeared,
209 or the inner scope popped. These are the decls that will *not* be
210 skipped when jumping to the label. */
212 /* The location of the goto, for error reporting. */
213 location_t o_goto_locus;
214 /* True if an OpenMP structured block scope has been closed since
215 the goto appeared. This means that the branch from the label will
216 illegally exit an OpenMP scope. */
220 /* A list of all LABEL_DECLs in the function that have names. Here so
221 we can clear out their names' definitions at the end of the
222 function, and so we can check the validity of jumps to these labels. */
224 struct GTY((for_user)) named_label_entry {
225 /* The decl itself. */
228 /* The binding level to which the label is *currently* attached.
229 This is initially set to the binding level in which the label
230 is defined, but is modified as scopes are closed. */
231 cp_binding_level *binding_level;
232 /* The head of the names list that was current when the label was
233 defined, or the inner scope popped. These are the decls that will
234 be skipped when jumping to the label. */
236 /* A vector of all decls from all binding levels that would be
237 crossed by a backward branch to the label. */
238 vec<tree, va_gc> *bad_decls;
240 /* A list of uses of the label, before the label is defined. */
241 struct named_label_use_entry *uses;
243 /* The following bits are set after the label is defined, and are
244 updated as scopes are popped. They indicate that a backward jump
245 to the label will illegally enter a scope of the given flavor. */
251 #define named_labels cp_function_chain->x_named_labels
253 /* The number of function bodies which we are currently processing.
254 (Zero if we are at namespace scope, one inside the body of a
255 function, two inside the body of a function in a local class, etc.) */
258 /* To avoid unwanted recursion, finish_function defers all mark_used calls
259 encountered during its execution until it finishes. */
260 bool defer_mark_used_calls;
261 vec<tree, va_gc> *deferred_mark_used_calls;
263 /* States indicating how grokdeclarator() should handle declspecs marked
264 with __attribute__((deprecated)). An object declared as
265 __attribute__((deprecated)) suppresses warnings of uses of other
267 enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
270 /* A list of VAR_DECLs whose type was incomplete at the time the
271 variable was declared. */
273 typedef struct GTY(()) incomplete_var_d {
275 tree incomplete_type;
279 static GTY(()) vec<incomplete_var, va_gc> *incomplete_vars;
281 /* Returns the kind of template specialization we are currently
282 processing, given that it's declaration contained N_CLASS_SCOPES
283 explicit scope qualifications. */
286 current_tmpl_spec_kind (int n_class_scopes)
288 int n_template_parm_scopes = 0;
289 int seen_specialization_p = 0;
290 int innermost_specialization_p = 0;
293 /* Scan through the template parameter scopes. */
294 for (b = current_binding_level;
295 b->kind == sk_template_parms;
298 /* If we see a specialization scope inside a parameter scope,
299 then something is wrong. That corresponds to a declaration
302 template <class T> template <> ...
304 which is always invalid since [temp.expl.spec] forbids the
305 specialization of a class member template if the enclosing
306 class templates are not explicitly specialized as well. */
307 if (b->explicit_spec_p)
309 if (n_template_parm_scopes == 0)
310 innermost_specialization_p = 1;
312 seen_specialization_p = 1;
314 else if (seen_specialization_p == 1)
315 return tsk_invalid_member_spec;
317 ++n_template_parm_scopes;
320 /* Handle explicit instantiations. */
321 if (processing_explicit_instantiation)
323 if (n_template_parm_scopes != 0)
324 /* We've seen a template parameter list during an explicit
325 instantiation. For example:
327 template <class T> template void f(int);
329 This is erroneous. */
330 return tsk_invalid_expl_inst;
332 return tsk_expl_inst;
335 if (n_template_parm_scopes < n_class_scopes)
336 /* We've not seen enough template headers to match all the
337 specialized classes present. For example:
339 template <class T> void R<T>::S<T>::f(int);
341 This is invalid; there needs to be one set of template
342 parameters for each class. */
343 return tsk_insufficient_parms;
344 else if (n_template_parm_scopes == n_class_scopes)
345 /* We're processing a non-template declaration (even though it may
346 be a member of a template class.) For example:
348 template <class T> void S<T>::f(int);
350 The `class T' matches the `S<T>', leaving no template headers
351 corresponding to the `f'. */
353 else if (n_template_parm_scopes > n_class_scopes + 1)
354 /* We've got too many template headers. For example:
356 template <> template <class T> void f (T);
358 There need to be more enclosing classes. */
359 return tsk_excessive_parms;
361 /* This must be a template. It's of the form:
363 template <class T> template <class U> void S<T>::f(U);
365 This is a specialization if the innermost level was a
366 specialization; otherwise it's just a definition of the
368 return innermost_specialization_p ? tsk_expl_spec : tsk_template;
371 /* Exit the current scope. */
379 /* When a label goes out of scope, check to see if that label was used
380 in a valid manner, and issue any appropriate warnings or errors. */
383 pop_label (tree label, tree old_value)
385 if (!processing_template_decl)
387 if (DECL_INITIAL (label) == NULL_TREE)
391 error ("label %q+D used but not defined", label);
392 location = input_location;
393 /* FIXME want (LOCATION_FILE (input_location), (line)0) */
394 /* Avoid crashing later. */
395 define_label (location, DECL_NAME (label));
398 warn_for_unused_label (label);
401 SET_IDENTIFIER_LABEL_VALUE (DECL_NAME (label), old_value);
404 /* At the end of a function, all labels declared within the function
405 go out of scope. BLOCK is the top-level block for the
409 pop_labels_1 (named_label_entry **slot, tree block)
411 struct named_label_entry *ent = *slot;
413 pop_label (ent->label_decl, NULL_TREE);
415 /* Put the labels into the "variables" of the top-level block,
416 so debugger can see them. */
417 DECL_CHAIN (ent->label_decl) = BLOCK_VARS (block);
418 BLOCK_VARS (block) = ent->label_decl;
420 named_labels->clear_slot (slot);
426 pop_labels (tree block)
430 named_labels->traverse<tree, pop_labels_1> (block);
435 /* At the end of a block with local labels, restore the outer definition. */
438 pop_local_label (tree label, tree old_value)
440 struct named_label_entry dummy;
442 pop_label (label, old_value);
444 dummy.label_decl = label;
445 named_label_entry **slot = named_labels->find_slot (&dummy, NO_INSERT);
446 named_labels->clear_slot (slot);
449 /* The following two routines are used to interface to Objective-C++.
450 The binding level is purposely treated as an opaque type. */
453 objc_get_current_scope (void)
455 return current_binding_level;
458 /* The following routine is used by the NeXT-style SJLJ exceptions;
459 variables get marked 'volatile' so as to not be clobbered by
460 _setjmp()/_longjmp() calls. All variables in the current scope,
461 as well as parent scopes up to (but not including) ENCLOSING_BLK
462 shall be thusly marked. */
465 objc_mark_locals_volatile (void *enclosing_blk)
467 cp_binding_level *scope;
469 for (scope = current_binding_level;
470 scope && scope != enclosing_blk;
471 scope = scope->level_chain)
475 for (decl = scope->names; decl; decl = TREE_CHAIN (decl))
476 objc_volatilize_decl (decl);
478 /* Do not climb up past the current function. */
479 if (scope->kind == sk_function_parms)
484 /* Update data for defined and undefined labels when leaving a scope. */
487 poplevel_named_label_1 (named_label_entry **slot, cp_binding_level *bl)
489 named_label_entry *ent = *slot;
490 cp_binding_level *obl = bl->level_chain;
492 if (ent->binding_level == bl)
496 /* ENT->NAMES_IN_SCOPE may contain a mixture of DECLs and
497 TREE_LISTs representing OVERLOADs, so be careful. */
498 for (decl = ent->names_in_scope; decl; decl = (DECL_P (decl)
500 : TREE_CHAIN (decl)))
501 if (decl_jump_unsafe (decl))
502 vec_safe_push (ent->bad_decls, decl);
504 ent->binding_level = obl;
505 ent->names_in_scope = obl->names;
509 ent->in_try_scope = true;
512 ent->in_catch_scope = true;
515 ent->in_omp_scope = true;
523 struct named_label_use_entry *use;
525 for (use = ent->uses; use ; use = use->next)
526 if (use->binding_level == bl)
528 use->binding_level = obl;
529 use->names_in_scope = obl->names;
530 if (bl->kind == sk_omp)
531 use->in_omp_scope = true;
538 /* Saved errorcount to avoid -Wunused-but-set-{parameter,variable} warnings
539 when errors were reported, except for -Werror-unused-but-set-*. */
540 static int unused_but_set_errorcount;
542 /* Exit a binding level.
543 Pop the level off, and restore the state of the identifier-decl mappings
544 that were in effect when this level was entered.
546 If KEEP == 1, this level had explicit declarations, so
547 and create a "block" (a BLOCK node) for the level
548 to record its declarations and subblocks for symbol table output.
550 If FUNCTIONBODY is nonzero, this level is the body of a function,
551 so create a block as if KEEP were set and also clear out all
554 If REVERSE is nonzero, reverse the order of decls before putting
555 them into the BLOCK. */
558 poplevel (int keep, int reverse, int functionbody)
561 /* The chain of decls was accumulated in reverse order.
562 Put it into forward order, just for cleanliness. */
567 int leaving_for_scope;
570 cp_label_binding *label_bind;
572 bool subtime = timevar_cond_start (TV_NAME_LOOKUP);
577 gcc_assert (current_binding_level->kind != sk_class);
579 if (current_binding_level->kind == sk_cleanup)
581 subblocks = functionbody >= 0 ? current_binding_level->blocks : 0;
583 gcc_assert (!vec_safe_length (current_binding_level->class_shadowed));
585 /* We used to use KEEP == 2 to indicate that the new block should go
586 at the beginning of the list of blocks at this binding level,
587 rather than the end. This hack is no longer used. */
588 gcc_assert (keep == 0 || keep == 1);
590 if (current_binding_level->keep)
593 /* Any uses of undefined labels, and any defined labels, now operate
594 under constraints of next binding contour. */
595 if (cfun && !functionbody && named_labels)
596 named_labels->traverse<cp_binding_level *, poplevel_named_label_1>
597 (current_binding_level);
599 /* Get the decls in the order they were written.
600 Usually current_binding_level->names is in reverse order.
601 But parameter decls were previously put in forward order. */
604 current_binding_level->names
605 = decls = nreverse (current_binding_level->names);
607 decls = current_binding_level->names;
609 /* If there were any declarations or structure tags in that level,
610 or if this level is a function body,
611 create a BLOCK to record them for the life of this function. */
613 /* Avoid function body block if possible. */
614 if (functionbody && subblocks && BLOCK_CHAIN (subblocks) == NULL_TREE)
616 else if (keep == 1 || functionbody)
617 block = make_node (BLOCK);
618 if (block != NULL_TREE)
620 BLOCK_VARS (block) = decls;
621 BLOCK_SUBBLOCKS (block) = subblocks;
624 /* In each subblock, record that this is its superior. */
626 for (link = subblocks; link; link = BLOCK_CHAIN (link))
627 BLOCK_SUPERCONTEXT (link) = block;
629 /* We still support the old for-scope rules, whereby the variables
630 in a for-init statement were in scope after the for-statement
631 ended. We only use the new rules if flag_new_for_scope is
634 = current_binding_level->kind == sk_for && flag_new_for_scope == 1;
636 /* Before we remove the declarations first check for unused variables. */
637 if ((warn_unused_variable || warn_unused_but_set_variable)
638 && current_binding_level->kind != sk_template_parms
639 && !processing_template_decl)
640 for (tree d = getdecls (); d; d = TREE_CHAIN (d))
642 /* There are cases where D itself is a TREE_LIST. See in
643 push_local_binding where the list of decls returned by
644 getdecls is built. */
645 decl = TREE_CODE (d) == TREE_LIST ? TREE_VALUE (d) : d;
646 tree type = TREE_TYPE (decl);
648 && (! TREE_USED (decl) || !DECL_READ_P (decl))
649 && ! DECL_IN_SYSTEM_HEADER (decl)
650 && DECL_NAME (decl) && ! DECL_ARTIFICIAL (decl)
651 && type != error_mark_node
652 && (!CLASS_TYPE_P (type)
653 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
654 || lookup_attribute ("warn_unused",
655 TYPE_ATTRIBUTES (TREE_TYPE (decl)))))
657 if (! TREE_USED (decl))
658 warning (OPT_Wunused_variable, "unused variable %q+D", decl);
659 else if (DECL_CONTEXT (decl) == current_function_decl
660 // For -Wunused-but-set-variable leave references alone.
661 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
662 && errorcount == unused_but_set_errorcount)
664 warning (OPT_Wunused_but_set_variable,
665 "variable %q+D set but not used", decl);
666 unused_but_set_errorcount = errorcount;
671 /* Remove declarations for all the DECLs in this level. */
672 for (link = decls; link; link = TREE_CHAIN (link))
674 if (leaving_for_scope && VAR_P (link)
675 /* It's hard to make this ARM compatibility hack play nicely with
676 lambdas, and it really isn't necessary in C++11 mode. */
677 && cxx_dialect < cxx11
680 tree name = DECL_NAME (link);
684 ob = outer_binding (name,
685 IDENTIFIER_BINDING (name),
688 ns_binding = IDENTIFIER_NAMESPACE_VALUE (name);
690 ns_binding = NULL_TREE;
692 if (ob && ob->scope == current_binding_level->level_chain)
693 /* We have something like:
698 and we are leaving the `for' scope. There's no reason to
699 keep the binding of the inner `i' in this case. */
700 pop_binding (name, link);
701 else if ((ob && (TREE_CODE (ob->value) == TYPE_DECL))
702 || (ns_binding && TREE_CODE (ns_binding) == TYPE_DECL))
703 /* Here, we have something like:
711 We must pop the for-scope binding so we know what's a
712 type and what isn't. */
713 pop_binding (name, link);
716 /* Mark this VAR_DECL as dead so that we can tell we left it
717 there only for backward compatibility. */
718 DECL_DEAD_FOR_LOCAL (link) = 1;
720 /* Keep track of what should have happened when we
721 popped the binding. */
724 SET_DECL_SHADOWED_FOR_VAR (link, ob->value);
725 DECL_HAS_SHADOWED_FOR_VAR_P (link) = 1;
728 /* Add it to the list of dead variables in the next
729 outermost binding to that we can remove these when we
730 leave that binding. */
732 current_binding_level->level_chain->dead_vars_from_for,
735 /* Although we don't pop the cxx_binding, we do clear
736 its SCOPE since the scope is going away now. */
737 IDENTIFIER_BINDING (name)->scope
738 = current_binding_level->level_chain;
745 /* Remove the binding. */
748 if (TREE_CODE (decl) == TREE_LIST)
749 decl = TREE_VALUE (decl);
752 if (TREE_CODE (name) == OVERLOAD)
753 name = OVL_FUNCTION (name);
755 gcc_assert (DECL_P (name));
756 pop_binding (DECL_NAME (name), decl);
760 /* Remove declarations for any `for' variables from inner scopes
761 that we kept around. */
762 FOR_EACH_VEC_SAFE_ELT_REVERSE (current_binding_level->dead_vars_from_for,
764 pop_binding (DECL_NAME (decl), decl);
766 /* Restore the IDENTIFIER_TYPE_VALUEs. */
767 for (link = current_binding_level->type_shadowed;
768 link; link = TREE_CHAIN (link))
769 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (link), TREE_VALUE (link));
771 /* Restore the IDENTIFIER_LABEL_VALUEs for local labels. */
772 FOR_EACH_VEC_SAFE_ELT_REVERSE (current_binding_level->shadowed_labels,
774 pop_local_label (label_bind->label, label_bind->prev_value);
776 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
777 list if a `using' declaration put them there. The debugging
778 back ends won't understand OVERLOAD, so we remove them here.
779 Because the BLOCK_VARS are (temporarily) shared with
780 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
781 popped all the bindings. */
786 for (d = &BLOCK_VARS (block); *d; )
788 if (TREE_CODE (*d) == TREE_LIST)
789 *d = TREE_CHAIN (*d);
791 d = &DECL_CHAIN (*d);
795 /* If the level being exited is the top level of a function,
796 check over all the labels. */
801 /* Since this is the top level block of a function, the vars are
802 the function's parameters. Don't leave them in the BLOCK
803 because they are found in the FUNCTION_DECL instead. */
804 BLOCK_VARS (block) = 0;
808 pop_labels (subblocks);
811 kind = current_binding_level->kind;
812 if (kind == sk_cleanup)
816 /* If this is a temporary binding created for a cleanup, then we'll
817 have pushed a statement list level. Pop that, create a new
818 BIND_EXPR for the block, and insert it into the stream. */
819 stmt = pop_stmt_list (current_binding_level->statement_list);
820 stmt = c_build_bind_expr (input_location, block, stmt);
827 /* The current function is being defined, so its DECL_INITIAL
828 should be error_mark_node. */
829 gcc_assert (DECL_INITIAL (current_function_decl) == error_mark_node);
830 DECL_INITIAL (current_function_decl) = block ? block : subblocks;
833 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
835 if (BLOCK_SUBBLOCKS (subblocks))
836 BLOCK_OUTER_CURLY_BRACE_P (BLOCK_SUBBLOCKS (subblocks)) = 1;
839 BLOCK_OUTER_CURLY_BRACE_P (subblocks) = 1;
843 current_binding_level->blocks
844 = block_chainon (current_binding_level->blocks, block);
846 /* If we did not make a block for the level just exited,
847 any blocks made for inner levels
848 (since they cannot be recorded as subblocks in that level)
849 must be carried forward so they will later become subblocks
850 of something else. */
852 current_binding_level->blocks
853 = block_chainon (current_binding_level->blocks, subblocks);
855 /* Each and every BLOCK node created here in `poplevel' is important
856 (e.g. for proper debugging information) so if we created one
857 earlier, mark it as "used". */
859 TREE_USED (block) = 1;
861 /* All temporary bindings created for cleanups are popped silently. */
862 if (kind == sk_cleanup)
865 timevar_cond_stop (TV_NAME_LOOKUP, subtime);
869 /* Walk all the namespaces contained NAMESPACE, including NAMESPACE
870 itself, calling F for each. The DATA is passed to F as well. */
873 walk_namespaces_r (tree name_space, walk_namespaces_fn f, void* data)
876 tree current = NAMESPACE_LEVEL (name_space)->namespaces;
878 result |= (*f) (name_space, data);
880 for (; current; current = DECL_CHAIN (current))
881 result |= walk_namespaces_r (current, f, data);
886 /* Walk all the namespaces, calling F for each. The DATA is passed to
890 walk_namespaces (walk_namespaces_fn f, void* data)
892 return walk_namespaces_r (global_namespace, f, data);
895 /* Call wrapup_globals_declarations for the globals in NAMESPACE. If
896 DATA is non-NULL, this is the last time we will call
897 wrapup_global_declarations for this NAMESPACE. */
900 wrapup_globals_for_namespace (tree name_space, void* data)
902 cp_binding_level *level = NAMESPACE_LEVEL (name_space);
903 vec<tree, va_gc> *statics = level->static_decls;
904 tree *vec = statics->address ();
905 int len = statics->length ();
906 int last_time = (data != 0);
910 check_global_declarations (vec, len);
911 emit_debug_global_declarations (vec, len);
915 /* Write out any globals that need to be output. */
916 return wrapup_global_declarations (vec, len);
920 /* In C++, you don't have to write `struct S' to refer to `S'; you
921 can just use `S'. We accomplish this by creating a TYPE_DECL as
922 if the user had written `typedef struct S S'. Create and return
923 the TYPE_DECL for TYPE. */
926 create_implicit_typedef (tree name, tree type)
930 decl = build_decl (input_location, TYPE_DECL, name, type);
931 DECL_ARTIFICIAL (decl) = 1;
932 /* There are other implicit type declarations, like the one *within*
933 a class that allows you to write `S::S'. We must distinguish
935 SET_DECL_IMPLICIT_TYPEDEF_P (decl);
936 TYPE_NAME (type) = decl;
937 TYPE_STUB_DECL (type) = decl;
942 /* Remember a local name for name-mangling purposes. */
945 push_local_name (tree decl)
950 timevar_start (TV_NAME_LOOKUP);
952 name = DECL_NAME (decl);
954 nelts = vec_safe_length (local_names);
955 for (i = 0; i < nelts; i++)
957 t = (*local_names)[i];
958 if (DECL_NAME (t) == name)
960 if (!DECL_LANG_SPECIFIC (decl))
961 retrofit_lang_decl (decl);
962 DECL_LANG_SPECIFIC (decl)->u.base.u2sel = 1;
963 if (DECL_DISCRIMINATOR_SET_P (t))
964 DECL_DISCRIMINATOR (decl) = DECL_DISCRIMINATOR (t) + 1;
966 DECL_DISCRIMINATOR (decl) = 1;
968 (*local_names)[i] = decl;
969 timevar_stop (TV_NAME_LOOKUP);
974 vec_safe_push (local_names, decl);
975 timevar_stop (TV_NAME_LOOKUP);
978 /* Subroutine of duplicate_decls: return truthvalue of whether
979 or not types of these decls match.
981 For C++, we must compare the parameter list so that `int' can match
982 `int&' in a parameter position, but `int&' is not confused with
986 decls_match (tree newdecl, tree olddecl)
990 if (newdecl == olddecl)
993 if (TREE_CODE (newdecl) != TREE_CODE (olddecl))
994 /* If the two DECLs are not even the same kind of thing, we're not
995 interested in their types. */
998 gcc_assert (DECL_P (newdecl));
1000 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1002 tree f1 = TREE_TYPE (newdecl);
1003 tree f2 = TREE_TYPE (olddecl);
1004 tree p1 = TYPE_ARG_TYPES (f1);
1005 tree p2 = TYPE_ARG_TYPES (f2);
1008 /* Specializations of different templates are different functions
1009 even if they have the same type. */
1010 tree t1 = (DECL_USE_TEMPLATE (newdecl)
1011 ? DECL_TI_TEMPLATE (newdecl)
1013 tree t2 = (DECL_USE_TEMPLATE (olddecl)
1014 ? DECL_TI_TEMPLATE (olddecl)
1019 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
1020 && ! (DECL_EXTERN_C_P (newdecl)
1021 && DECL_EXTERN_C_P (olddecl)))
1024 /* A new declaration doesn't match a built-in one unless it
1025 is also extern "C". */
1026 if (DECL_IS_BUILTIN (olddecl)
1027 && DECL_EXTERN_C_P (olddecl) && !DECL_EXTERN_C_P (newdecl))
1030 if (TREE_CODE (f1) != TREE_CODE (f2))
1033 /* A declaration with deduced return type should use its pre-deduction
1034 type for declaration matching. */
1035 r2 = fndecl_declared_return_type (olddecl);
1037 if (same_type_p (TREE_TYPE (f1), r2))
1039 if (!prototype_p (f2) && DECL_EXTERN_C_P (olddecl)
1040 && (DECL_BUILT_IN (olddecl)
1041 #ifndef NO_IMPLICIT_EXTERN_C
1042 || (DECL_IN_SYSTEM_HEADER (newdecl) && !DECL_CLASS_SCOPE_P (newdecl))
1043 || (DECL_IN_SYSTEM_HEADER (olddecl) && !DECL_CLASS_SCOPE_P (olddecl))
1047 types_match = self_promoting_args_p (p1);
1048 if (p1 == void_list_node)
1049 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
1051 #ifndef NO_IMPLICIT_EXTERN_C
1052 else if (!prototype_p (f1)
1053 && (DECL_EXTERN_C_P (olddecl)
1054 && DECL_IN_SYSTEM_HEADER (olddecl)
1055 && !DECL_CLASS_SCOPE_P (olddecl))
1056 && (DECL_EXTERN_C_P (newdecl)
1057 && DECL_IN_SYSTEM_HEADER (newdecl)
1058 && !DECL_CLASS_SCOPE_P (newdecl)))
1060 types_match = self_promoting_args_p (p2);
1061 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
1067 && type_memfn_rqual (f1) == type_memfn_rqual (f2)
1068 && (TYPE_ATTRIBUTES (TREE_TYPE (newdecl)) == NULL_TREE
1069 || comp_type_attributes (TREE_TYPE (newdecl),
1070 TREE_TYPE (olddecl)) != 0);
1075 /* The decls dont match if they correspond to two different versions
1076 of the same function. Disallow extern "C" functions to be
1077 versions for now. */
1079 && !DECL_EXTERN_C_P (newdecl)
1080 && !DECL_EXTERN_C_P (olddecl)
1081 && targetm.target_option.function_versions (newdecl, olddecl))
1083 /* Mark functions as versions if necessary. Modify the mangled decl
1084 name if necessary. */
1085 if (DECL_FUNCTION_VERSIONED (newdecl)
1086 && DECL_FUNCTION_VERSIONED (olddecl))
1088 if (!DECL_FUNCTION_VERSIONED (newdecl))
1090 DECL_FUNCTION_VERSIONED (newdecl) = 1;
1091 if (DECL_ASSEMBLER_NAME_SET_P (newdecl))
1092 mangle_decl (newdecl);
1094 if (!DECL_FUNCTION_VERSIONED (olddecl))
1096 DECL_FUNCTION_VERSIONED (olddecl) = 1;
1097 if (DECL_ASSEMBLER_NAME_SET_P (olddecl))
1098 mangle_decl (olddecl);
1100 cgraph_node::record_function_versions (olddecl, newdecl);
1104 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1106 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl))
1107 != TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)))
1110 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1111 DECL_TEMPLATE_PARMS (olddecl)))
1114 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1115 types_match = same_type_p (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl)),
1116 TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl)));
1118 types_match = decls_match (DECL_TEMPLATE_RESULT (olddecl),
1119 DECL_TEMPLATE_RESULT (newdecl));
1123 /* Need to check scope for variable declaration (VAR_DECL).
1124 For typedef (TYPE_DECL), scope is ignored. */
1126 && CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
1128 Two declarations for an object with C language linkage
1129 with the same name (ignoring the namespace that qualify
1130 it) that appear in different namespace scopes refer to
1132 && !(DECL_EXTERN_C_P (olddecl) && DECL_EXTERN_C_P (newdecl)))
1135 if (TREE_TYPE (newdecl) == error_mark_node)
1136 types_match = TREE_TYPE (olddecl) == error_mark_node;
1137 else if (TREE_TYPE (olddecl) == NULL_TREE)
1138 types_match = TREE_TYPE (newdecl) == NULL_TREE;
1139 else if (TREE_TYPE (newdecl) == NULL_TREE)
1142 types_match = comptypes (TREE_TYPE (newdecl),
1143 TREE_TYPE (olddecl),
1144 COMPARE_REDECLARATION);
1150 /* If NEWDECL is `static' and an `extern' was seen previously,
1151 warn about it. OLDDECL is the previous declaration.
1153 Note that this does not apply to the C++ case of declaring
1154 a variable `extern const' and then later `const'.
1156 Don't complain about built-in functions, since they are beyond
1157 the user's control. */
1160 warn_extern_redeclared_static (tree newdecl, tree olddecl)
1162 if (TREE_CODE (newdecl) == TYPE_DECL
1163 || TREE_CODE (newdecl) == TEMPLATE_DECL
1164 || TREE_CODE (newdecl) == CONST_DECL
1165 || TREE_CODE (newdecl) == NAMESPACE_DECL)
1168 /* Don't get confused by static member functions; that's a different
1170 if (TREE_CODE (newdecl) == FUNCTION_DECL
1171 && DECL_STATIC_FUNCTION_P (newdecl))
1174 /* If the old declaration was `static', or the new one isn't, then
1175 everything is OK. */
1176 if (DECL_THIS_STATIC (olddecl) || !DECL_THIS_STATIC (newdecl))
1179 /* It's OK to declare a builtin function as `static'. */
1180 if (TREE_CODE (olddecl) == FUNCTION_DECL
1181 && DECL_ARTIFICIAL (olddecl))
1184 if (permerror (input_location,
1185 "%qD was declared %<extern%> and later %<static%>", newdecl))
1186 inform (input_location, "previous declaration of %q+D", olddecl);
1189 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1190 function templates. If their exception specifications do not
1191 match, issue a diagnostic. */
1194 check_redeclaration_exception_specification (tree new_decl,
1197 tree new_exceptions = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (new_decl));
1198 tree old_exceptions = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (old_decl));
1200 /* Two default specs are equivalent, don't force evaluation. */
1201 if (UNEVALUATED_NOEXCEPT_SPEC_P (new_exceptions)
1202 && UNEVALUATED_NOEXCEPT_SPEC_P (old_exceptions))
1205 maybe_instantiate_noexcept (new_decl);
1206 maybe_instantiate_noexcept (old_decl);
1207 new_exceptions = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (new_decl));
1208 old_exceptions = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (old_decl));
1212 If any declaration of a function has an exception-specification,
1213 all declarations, including the definition and an explicit
1214 specialization, of that function shall have an
1215 exception-specification with the same set of type-ids. */
1216 if ((pedantic || ! DECL_IN_SYSTEM_HEADER (old_decl))
1217 && ! DECL_IS_BUILTIN (old_decl)
1219 && !comp_except_specs (new_exceptions, old_exceptions, ce_normal))
1221 error ("declaration of %qF has a different exception specifier",
1223 error ("from previous declaration %q+F", old_decl);
1227 /* Return true if OLD_DECL and NEW_DECL agree on constexprness.
1228 Otherwise issue diagnostics. */
1231 validate_constexpr_redeclaration (tree old_decl, tree new_decl)
1233 old_decl = STRIP_TEMPLATE (old_decl);
1234 new_decl = STRIP_TEMPLATE (new_decl);
1235 if (!VAR_OR_FUNCTION_DECL_P (old_decl)
1236 || !VAR_OR_FUNCTION_DECL_P (new_decl))
1238 if (DECL_DECLARED_CONSTEXPR_P (old_decl)
1239 == DECL_DECLARED_CONSTEXPR_P (new_decl))
1241 if (TREE_CODE (old_decl) == FUNCTION_DECL)
1243 if (DECL_BUILT_IN (old_decl))
1245 /* Hide a built-in declaration. */
1246 DECL_DECLARED_CONSTEXPR_P (old_decl)
1247 = DECL_DECLARED_CONSTEXPR_P (new_decl);
1250 /* 7.1.5 [dcl.constexpr]
1251 Note: An explicit specialization can differ from the template
1252 declaration with respect to the constexpr specifier. */
1253 if (! DECL_TEMPLATE_SPECIALIZATION (old_decl)
1254 && DECL_TEMPLATE_SPECIALIZATION (new_decl))
1257 error ("redeclaration %qD differs in %<constexpr%>", new_decl);
1258 error ("from previous declaration %q+D", old_decl);
1264 /* DECL is a redeclaration of a function or function template. If
1265 it does have default arguments issue a diagnostic. Note: this
1266 function is used to enforce the requirements in C++11 8.3.6 about
1267 no default arguments in redeclarations. */
1270 check_redeclaration_no_default_args (tree decl)
1272 gcc_assert (DECL_DECLARES_FUNCTION_P (decl));
1274 for (tree t = FUNCTION_FIRST_USER_PARMTYPE (decl);
1275 t && t != void_list_node; t = TREE_CHAIN (t))
1276 if (TREE_PURPOSE (t))
1278 permerror (input_location,
1279 "redeclaration of %q#D may not have default "
1285 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1286 && lookup_attribute ("gnu_inline", \
1287 DECL_ATTRIBUTES (fn)))
1289 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1290 If the redeclaration is invalid, a diagnostic is issued, and the
1291 error_mark_node is returned. Otherwise, OLDDECL is returned.
1293 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1296 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1299 duplicate_decls (tree newdecl, tree olddecl, bool newdecl_is_friend)
1301 unsigned olddecl_uid = DECL_UID (olddecl);
1302 int olddecl_friend = 0, types_match = 0, hidden_friend = 0;
1303 int new_defines_function = 0;
1304 tree new_template_info;
1306 if (newdecl == olddecl)
1309 types_match = decls_match (newdecl, olddecl);
1311 /* If either the type of the new decl or the type of the old decl is an
1312 error_mark_node, then that implies that we have already issued an
1313 error (earlier) for some bogus type specification, and in that case,
1314 it is rather pointless to harass the user with yet more error message
1315 about the same declaration, so just pretend the types match here. */
1316 if (TREE_TYPE (newdecl) == error_mark_node
1317 || TREE_TYPE (olddecl) == error_mark_node)
1318 return error_mark_node;
1320 if (UDLIT_OPER_P (DECL_NAME (newdecl))
1321 && UDLIT_OPER_P (DECL_NAME (olddecl)))
1323 if (TREE_CODE (newdecl) == TEMPLATE_DECL
1324 && TREE_CODE (olddecl) != TEMPLATE_DECL
1325 && check_raw_literal_operator (olddecl))
1326 error ("literal operator template %q+D conflicts with"
1327 " raw literal operator %qD", newdecl, olddecl);
1328 else if (TREE_CODE (newdecl) != TEMPLATE_DECL
1329 && TREE_CODE (olddecl) == TEMPLATE_DECL
1330 && check_raw_literal_operator (newdecl))
1331 error ("raw literal operator %q+D conflicts with"
1332 " literal operator template %qD", newdecl, olddecl);
1335 if (DECL_P (olddecl)
1336 && TREE_CODE (newdecl) == FUNCTION_DECL
1337 && TREE_CODE (olddecl) == FUNCTION_DECL
1338 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1340 if (DECL_DECLARED_INLINE_P (newdecl)
1341 && DECL_UNINLINABLE (newdecl)
1342 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1343 /* Already warned elsewhere. */;
1344 else if (DECL_DECLARED_INLINE_P (olddecl)
1345 && DECL_UNINLINABLE (olddecl)
1346 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1347 /* Already warned. */;
1348 else if (DECL_DECLARED_INLINE_P (newdecl)
1349 && DECL_UNINLINABLE (olddecl)
1350 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1352 if (warning (OPT_Wattributes, "function %q+D redeclared as inline",
1354 inform (DECL_SOURCE_LOCATION (olddecl),
1355 "previous declaration of %qD with attribute noinline",
1358 else if (DECL_DECLARED_INLINE_P (olddecl)
1359 && DECL_UNINLINABLE (newdecl)
1360 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1362 if (warning (OPT_Wattributes, "function %q+D redeclared with "
1363 "attribute noinline", newdecl))
1364 inform (DECL_SOURCE_LOCATION (olddecl),
1365 "previous declaration of %qD was inline",
1370 /* Check for redeclaration and other discrepancies. */
1371 if (TREE_CODE (olddecl) == FUNCTION_DECL
1372 && DECL_ARTIFICIAL (olddecl))
1374 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl));
1375 if (TREE_CODE (newdecl) != FUNCTION_DECL)
1377 /* Avoid warnings redeclaring built-ins which have not been
1378 explicitly declared. */
1379 if (DECL_ANTICIPATED (olddecl))
1382 /* If you declare a built-in or predefined function name as static,
1383 the old definition is overridden, but optionally warn this was a
1384 bad choice of name. */
1385 if (! TREE_PUBLIC (newdecl))
1387 warning (OPT_Wshadow,
1388 DECL_BUILT_IN (olddecl)
1389 ? G_("shadowing built-in function %q#D")
1390 : G_("shadowing library function %q#D"), olddecl);
1391 /* Discard the old built-in function. */
1394 /* If the built-in is not ansi, then programs can override
1395 it even globally without an error. */
1396 else if (! DECL_BUILT_IN (olddecl))
1397 warning (0, "library function %q#D redeclared as non-function %q#D",
1400 error ("declaration of %q#D conflicts with built-in "
1401 "declaration %q#D", newdecl, olddecl);
1404 else if (DECL_OMP_DECLARE_REDUCTION_P (olddecl))
1406 gcc_assert (DECL_OMP_DECLARE_REDUCTION_P (newdecl));
1407 error_at (DECL_SOURCE_LOCATION (newdecl),
1408 "redeclaration of %<pragma omp declare reduction%>");
1409 inform (DECL_SOURCE_LOCATION (olddecl),
1410 "previous %<pragma omp declare reduction%> declaration");
1411 return error_mark_node;
1413 else if (!types_match)
1415 /* Avoid warnings redeclaring built-ins which have not been
1416 explicitly declared. */
1417 if (DECL_ANTICIPATED (olddecl))
1419 /* Deal with fileptr_type_node. FILE type is not known
1420 at the time we create the builtins. */
1423 for (t1 = TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1424 t2 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1426 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1429 else if (TREE_VALUE (t2) == fileptr_type_node)
1431 tree t = TREE_VALUE (t1);
1434 && TYPE_IDENTIFIER (TREE_TYPE (t))
1435 == get_identifier ("FILE")
1436 && compparms (TREE_CHAIN (t1), TREE_CHAIN (t2)))
1438 tree oldargs = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1440 TYPE_ARG_TYPES (TREE_TYPE (olddecl))
1441 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1442 types_match = decls_match (newdecl, olddecl);
1444 return duplicate_decls (newdecl, olddecl,
1446 TYPE_ARG_TYPES (TREE_TYPE (olddecl)) = oldargs;
1449 else if (! same_type_p (TREE_VALUE (t1), TREE_VALUE (t2)))
1452 else if ((DECL_EXTERN_C_P (newdecl)
1453 && DECL_EXTERN_C_P (olddecl))
1454 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1455 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1457 /* A near match; override the builtin. */
1459 if (TREE_PUBLIC (newdecl))
1460 warning (0, "new declaration %q#D ambiguates built-in "
1461 "declaration %q#D", newdecl, olddecl);
1463 warning (OPT_Wshadow,
1464 DECL_BUILT_IN (olddecl)
1465 ? G_("shadowing built-in function %q#D")
1466 : G_("shadowing library function %q#D"), olddecl);
1469 /* Discard the old built-in function. */
1472 /* Replace the old RTL to avoid problems with inlining. */
1473 COPY_DECL_RTL (newdecl, olddecl);
1475 /* Even if the types match, prefer the new declarations type for
1476 built-ins which have not been explicitly declared, for
1477 exception lists, etc... */
1478 else if (DECL_IS_BUILTIN (olddecl))
1480 tree type = TREE_TYPE (newdecl);
1481 tree attribs = (*targetm.merge_type_attributes)
1482 (TREE_TYPE (olddecl), type);
1484 type = cp_build_type_attribute_variant (type, attribs);
1485 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = type;
1488 /* If a function is explicitly declared "throw ()", propagate that to
1489 the corresponding builtin. */
1490 if (DECL_BUILT_IN_CLASS (olddecl) == BUILT_IN_NORMAL
1491 && DECL_ANTICIPATED (olddecl)
1492 && TREE_NOTHROW (newdecl)
1493 && !TREE_NOTHROW (olddecl))
1495 enum built_in_function fncode = DECL_FUNCTION_CODE (olddecl);
1496 tree tmpdecl = builtin_decl_explicit (fncode);
1497 if (tmpdecl && tmpdecl != olddecl && types_match)
1498 TREE_NOTHROW (tmpdecl) = 1;
1501 /* Whether or not the builtin can throw exceptions has no
1502 bearing on this declarator. */
1503 TREE_NOTHROW (olddecl) = 0;
1505 if (DECL_THIS_STATIC (newdecl) && !DECL_THIS_STATIC (olddecl))
1507 /* If a builtin function is redeclared as `static', merge
1508 the declarations, but make the original one static. */
1509 DECL_THIS_STATIC (olddecl) = 1;
1510 TREE_PUBLIC (olddecl) = 0;
1512 /* Make the old declaration consistent with the new one so
1513 that all remnants of the builtin-ness of this function
1514 will be banished. */
1515 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1516 COPY_DECL_RTL (newdecl, olddecl);
1519 else if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1521 /* C++ Standard, 3.3, clause 4:
1522 "[Note: a namespace name or a class template name must be unique
1523 in its declarative region (7.3.2, clause 14). ]" */
1524 if (TREE_CODE (olddecl) != NAMESPACE_DECL
1525 && TREE_CODE (newdecl) != NAMESPACE_DECL
1526 && (TREE_CODE (olddecl) != TEMPLATE_DECL
1527 || TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) != TYPE_DECL)
1528 && (TREE_CODE (newdecl) != TEMPLATE_DECL
1529 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != TYPE_DECL))
1531 if ((TREE_CODE (olddecl) == TYPE_DECL && DECL_ARTIFICIAL (olddecl)
1532 && TREE_CODE (newdecl) != TYPE_DECL)
1533 || (TREE_CODE (newdecl) == TYPE_DECL && DECL_ARTIFICIAL (newdecl)
1534 && TREE_CODE (olddecl) != TYPE_DECL))
1536 /* We do nothing special here, because C++ does such nasty
1537 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1538 get shadowed, and know that if we need to find a TYPE_DECL
1539 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1540 slot of the identifier. */
1544 if ((TREE_CODE (newdecl) == FUNCTION_DECL
1545 && DECL_FUNCTION_TEMPLATE_P (olddecl))
1546 || (TREE_CODE (olddecl) == FUNCTION_DECL
1547 && DECL_FUNCTION_TEMPLATE_P (newdecl)))
1551 error ("%q#D redeclared as different kind of symbol", newdecl);
1552 if (TREE_CODE (olddecl) == TREE_LIST)
1553 olddecl = TREE_VALUE (olddecl);
1554 inform (DECL_SOURCE_LOCATION (olddecl),
1555 "previous declaration %q#D", olddecl);
1557 return error_mark_node;
1559 else if (!types_match)
1561 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
1562 /* These are certainly not duplicate declarations; they're
1563 from different scopes. */
1566 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1568 /* The name of a class template may not be declared to refer to
1569 any other template, class, function, object, namespace, value,
1570 or type in the same scope. */
1571 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == TYPE_DECL
1572 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1574 error ("conflicting declaration of template %q#D", newdecl);
1575 inform (DECL_SOURCE_LOCATION (olddecl),
1576 "previous declaration %q#D", olddecl);
1577 return error_mark_node;
1579 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == FUNCTION_DECL
1580 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == FUNCTION_DECL
1581 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl))),
1582 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl))))
1583 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1584 DECL_TEMPLATE_PARMS (olddecl))
1585 /* Template functions can be disambiguated by
1587 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl)),
1588 TREE_TYPE (TREE_TYPE (olddecl))))
1590 error ("ambiguating new declaration %q#D", newdecl);
1591 inform (DECL_SOURCE_LOCATION (olddecl),
1592 "old declaration %q#D", olddecl);
1596 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1598 if (DECL_EXTERN_C_P (newdecl) && DECL_EXTERN_C_P (olddecl))
1600 error ("conflicting declaration of C function %q#D",
1602 inform (DECL_SOURCE_LOCATION (olddecl),
1603 "previous declaration %q#D", olddecl);
1606 /* For function versions, params and types match, but they
1607 are not ambiguous. */
1608 else if ((!DECL_FUNCTION_VERSIONED (newdecl)
1609 && !DECL_FUNCTION_VERSIONED (olddecl))
1610 && compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1611 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1613 error ("ambiguating new declaration of %q#D", newdecl);
1614 inform (DECL_SOURCE_LOCATION (olddecl),
1615 "old declaration %q#D", olddecl);
1616 return error_mark_node;
1623 error ("conflicting declaration %q#D", newdecl);
1624 inform (DECL_SOURCE_LOCATION (olddecl),
1625 "previous declaration as %q#D", olddecl);
1626 return error_mark_node;
1629 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1630 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1631 && (!DECL_TEMPLATE_INFO (newdecl)
1632 || (DECL_TI_TEMPLATE (newdecl)
1633 != DECL_TI_TEMPLATE (olddecl))))
1634 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1635 && (!DECL_TEMPLATE_INFO (olddecl)
1636 || (DECL_TI_TEMPLATE (olddecl)
1637 != DECL_TI_TEMPLATE (newdecl))))))
1638 /* It's OK to have a template specialization and a non-template
1639 with the same type, or to have specializations of two
1640 different templates with the same type. Note that if one is a
1641 specialization, and the other is an instantiation of the same
1642 template, that we do not exit at this point. That situation
1643 can occur if we instantiate a template class, and then
1644 specialize one of its methods. This situation is valid, but
1645 the declarations must be merged in the usual way. */
1647 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1648 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1649 && !DECL_USE_TEMPLATE (newdecl))
1650 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1651 && !DECL_USE_TEMPLATE (olddecl))))
1652 /* One of the declarations is a template instantiation, and the
1653 other is not a template at all. That's OK. */
1655 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1657 /* In [namespace.alias] we have:
1659 In a declarative region, a namespace-alias-definition can be
1660 used to redefine a namespace-alias declared in that declarative
1661 region to refer only to the namespace to which it already
1664 Therefore, if we encounter a second alias directive for the same
1665 alias, we can just ignore the second directive. */
1666 if (DECL_NAMESPACE_ALIAS (newdecl)
1667 && (DECL_NAMESPACE_ALIAS (newdecl)
1668 == DECL_NAMESPACE_ALIAS (olddecl)))
1670 /* [namespace.alias]
1672 A namespace-name or namespace-alias shall not be declared as
1673 the name of any other entity in the same declarative region.
1674 A namespace-name defined at global scope shall not be
1675 declared as the name of any other entity in any global scope
1677 error ("conflicting declaration of namespace %qD", newdecl);
1678 inform (DECL_SOURCE_LOCATION (olddecl),
1679 "previous declaration of namespace %qD here", olddecl);
1680 return error_mark_node;
1684 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1687 error_at (DECL_SOURCE_LOCATION (newdecl), errmsg, newdecl);
1688 if (DECL_NAME (olddecl) != NULL_TREE)
1689 inform (input_location,
1690 (DECL_INITIAL (olddecl) && namespace_bindings_p ())
1691 ? G_("%q+#D previously defined here")
1692 : G_("%q+#D previously declared here"), olddecl);
1693 return error_mark_node;
1695 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1696 && DECL_INITIAL (olddecl) != NULL_TREE
1697 && !prototype_p (TREE_TYPE (olddecl))
1698 && prototype_p (TREE_TYPE (newdecl)))
1700 /* Prototype decl follows defn w/o prototype. */
1701 if (warning_at (DECL_SOURCE_LOCATION (newdecl), 0,
1702 "prototype specified for %q#D", newdecl))
1703 inform (DECL_SOURCE_LOCATION (olddecl),
1704 "previous non-prototype definition here");
1706 else if (VAR_OR_FUNCTION_DECL_P (olddecl)
1707 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1710 If two declarations of the same function or object
1711 specify different linkage-specifications ..., the program
1712 is ill-formed.... Except for functions with C++ linkage,
1713 a function declaration without a linkage specification
1714 shall not precede the first linkage specification for
1715 that function. A function can be declared without a
1716 linkage specification after an explicit linkage
1717 specification has been seen; the linkage explicitly
1718 specified in the earlier declaration is not affected by
1719 such a function declaration.
1721 DR 563 raises the question why the restrictions on
1722 functions should not also apply to objects. Older
1723 versions of G++ silently ignore the linkage-specification
1731 which is clearly wrong. Therefore, we now treat objects
1733 if (current_lang_depth () == 0)
1735 /* There is no explicit linkage-specification, so we use
1736 the linkage from the previous declaration. */
1737 if (!DECL_LANG_SPECIFIC (newdecl))
1738 retrofit_lang_decl (newdecl);
1739 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1743 error ("conflicting declaration of %q#D with %qL linkage",
1744 newdecl, DECL_LANGUAGE (newdecl));
1745 inform (DECL_SOURCE_LOCATION (olddecl),
1746 "previous declaration with %qL linkage",
1747 DECL_LANGUAGE (olddecl));
1751 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1753 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1755 /* Note: free functions, as TEMPLATE_DECLs, are handled below. */
1756 if (DECL_FUNCTION_MEMBER_P (olddecl)
1757 && (/* grokfndecl passes member function templates too
1758 as FUNCTION_DECLs. */
1759 DECL_TEMPLATE_INFO (olddecl)
1761 Default arguments for a member function of a class
1762 template shall be specified on the initial declaration
1763 of the member function within the class template. */
1764 || CLASSTYPE_TEMPLATE_INFO (CP_DECL_CONTEXT (olddecl))))
1765 check_redeclaration_no_default_args (newdecl);
1768 tree t1 = FUNCTION_FIRST_USER_PARMTYPE (olddecl);
1769 tree t2 = FUNCTION_FIRST_USER_PARMTYPE (newdecl);
1772 for (; t1 && t1 != void_list_node;
1773 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1774 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1776 if (1 == simple_cst_equal (TREE_PURPOSE (t1),
1779 if (permerror (input_location,
1780 "default argument given for parameter "
1781 "%d of %q#D", i, newdecl))
1782 inform (DECL_SOURCE_LOCATION (olddecl),
1783 "previous specification in %q#D here",
1788 error ("default argument given for parameter %d "
1789 "of %q#D", i, newdecl);
1790 inform (DECL_SOURCE_LOCATION (olddecl),
1791 "previous specification in %q#D here",
1799 /* Do not merge an implicit typedef with an explicit one. In:
1803 typedef class A A __attribute__ ((foo));
1805 the attribute should apply only to the typedef. */
1806 if (TREE_CODE (olddecl) == TYPE_DECL
1807 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1808 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1811 /* If new decl is `static' and an `extern' was seen previously,
1813 warn_extern_redeclared_static (newdecl, olddecl);
1815 if (!validate_constexpr_redeclaration (olddecl, newdecl))
1816 return error_mark_node;
1818 /* We have committed to returning 1 at this point. */
1819 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1821 /* Now that functions must hold information normally held
1822 by field decls, there is extra work to do so that
1823 declaration information does not get destroyed during
1825 if (DECL_VINDEX (olddecl))
1826 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1827 if (DECL_CONTEXT (olddecl))
1828 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1829 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1830 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1831 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1832 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1833 DECL_INVALID_OVERRIDER_P (newdecl) |= DECL_INVALID_OVERRIDER_P (olddecl);
1834 DECL_FINAL_P (newdecl) |= DECL_FINAL_P (olddecl);
1835 DECL_OVERRIDE_P (newdecl) |= DECL_OVERRIDE_P (olddecl);
1836 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1837 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1838 SET_OVERLOADED_OPERATOR_CODE
1839 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1840 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1842 /* Optionally warn about more than one declaration for the same
1843 name, but don't warn about a function declaration followed by a
1845 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1846 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1847 /* Don't warn about extern decl followed by definition. */
1848 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1849 /* Don't warn about friends, let add_friend take care of it. */
1850 && ! (newdecl_is_friend || DECL_FRIEND_P (olddecl))
1851 /* Don't warn about declaration followed by specialization. */
1852 && (! DECL_TEMPLATE_SPECIALIZATION (newdecl)
1853 || DECL_TEMPLATE_SPECIALIZATION (olddecl)))
1855 if (warning (OPT_Wredundant_decls,
1856 "redundant redeclaration of %qD in same scope",
1858 inform (DECL_SOURCE_LOCATION (olddecl),
1859 "previous declaration of %qD", olddecl);
1862 if (!(DECL_TEMPLATE_INSTANTIATION (olddecl)
1863 && DECL_TEMPLATE_SPECIALIZATION (newdecl)))
1865 if (DECL_DELETED_FN (newdecl))
1867 error ("deleted definition of %qD", newdecl);
1868 inform (DECL_SOURCE_LOCATION (olddecl),
1869 "previous declaration of %qD", olddecl);
1871 DECL_DELETED_FN (newdecl) |= DECL_DELETED_FN (olddecl);
1875 /* Deal with C++: must preserve virtual function table size. */
1876 if (TREE_CODE (olddecl) == TYPE_DECL)
1878 tree newtype = TREE_TYPE (newdecl);
1879 tree oldtype = TREE_TYPE (olddecl);
1881 if (newtype != error_mark_node && oldtype != error_mark_node
1882 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1883 CLASSTYPE_FRIEND_CLASSES (newtype)
1884 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1886 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1889 /* Copy all the DECL_... slots specified in the new decl
1890 except for any that we copy here from the old type. */
1891 DECL_ATTRIBUTES (newdecl)
1892 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1894 if (DECL_DECLARES_FUNCTION_P (olddecl) && DECL_DECLARES_FUNCTION_P (newdecl))
1896 olddecl_friend = DECL_FRIEND_P (olddecl);
1897 hidden_friend = (DECL_ANTICIPATED (olddecl)
1898 && DECL_HIDDEN_FRIEND_P (olddecl)
1899 && newdecl_is_friend);
1902 DECL_ANTICIPATED (olddecl) = 0;
1903 DECL_HIDDEN_FRIEND_P (olddecl) = 0;
1907 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1911 old_result = DECL_TEMPLATE_RESULT (olddecl);
1912 new_result = DECL_TEMPLATE_RESULT (newdecl);
1913 TREE_TYPE (olddecl) = TREE_TYPE (old_result);
1914 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1915 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1916 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1918 DECL_ATTRIBUTES (old_result)
1919 = (*targetm.merge_decl_attributes) (old_result, new_result);
1921 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1923 /* Per C++11 8.3.6/4, default arguments cannot be added in later
1924 declarations of a function template. */
1925 if (DECL_SOURCE_LOCATION (newdecl)
1926 != DECL_SOURCE_LOCATION (olddecl))
1927 check_redeclaration_no_default_args (newdecl);
1929 check_default_args (newdecl);
1931 if (GNU_INLINE_P (old_result) != GNU_INLINE_P (new_result)
1932 && DECL_INITIAL (new_result))
1934 if (DECL_INITIAL (old_result))
1935 DECL_UNINLINABLE (old_result) = 1;
1937 DECL_UNINLINABLE (old_result) = DECL_UNINLINABLE (new_result);
1938 DECL_EXTERNAL (old_result) = DECL_EXTERNAL (new_result);
1939 DECL_NOT_REALLY_EXTERN (old_result)
1940 = DECL_NOT_REALLY_EXTERN (new_result);
1941 DECL_INTERFACE_KNOWN (old_result)
1942 = DECL_INTERFACE_KNOWN (new_result);
1943 DECL_DECLARED_INLINE_P (old_result)
1944 = DECL_DECLARED_INLINE_P (new_result);
1945 DECL_DISREGARD_INLINE_LIMITS (old_result)
1946 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1951 DECL_DECLARED_INLINE_P (old_result)
1952 |= DECL_DECLARED_INLINE_P (new_result);
1953 DECL_DISREGARD_INLINE_LIMITS (old_result)
1954 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1955 check_redeclaration_exception_specification (newdecl, olddecl);
1959 /* If the new declaration is a definition, update the file and
1960 line information on the declaration, and also make
1961 the old declaration the same definition. */
1962 if (DECL_INITIAL (new_result) != NULL_TREE)
1964 DECL_SOURCE_LOCATION (olddecl)
1965 = DECL_SOURCE_LOCATION (old_result)
1966 = DECL_SOURCE_LOCATION (newdecl);
1967 DECL_INITIAL (old_result) = DECL_INITIAL (new_result);
1968 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1971 DECL_ARGUMENTS (old_result)
1972 = DECL_ARGUMENTS (new_result);
1973 for (parm = DECL_ARGUMENTS (old_result); parm;
1974 parm = DECL_CHAIN (parm))
1975 DECL_CONTEXT (parm) = old_result;
1984 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1985 check_redeclaration_exception_specification (newdecl, olddecl);
1987 /* Automatically handles default parameters. */
1988 tree oldtype = TREE_TYPE (olddecl);
1991 /* For typedefs use the old type, as the new type's DECL_NAME points
1992 at newdecl, which will be ggc_freed. */
1993 if (TREE_CODE (newdecl) == TYPE_DECL)
1996 /* Merge the data types specified in the two decls. */
1997 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1999 if (VAR_P (newdecl))
2001 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
2002 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
2003 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl)
2004 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl);
2005 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
2006 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
2008 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
2009 if (DECL_LANG_SPECIFIC (olddecl)
2010 && CP_DECL_THREADPRIVATE_P (olddecl))
2012 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
2013 if (!DECL_LANG_SPECIFIC (newdecl))
2014 retrofit_lang_decl (newdecl);
2016 CP_DECL_THREADPRIVATE_P (newdecl) = 1;
2020 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
2022 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2023 check_default_args (newdecl);
2025 /* Lay the type out, unless already done. */
2026 if (! same_type_p (newtype, oldtype)
2027 && TREE_TYPE (newdecl) != error_mark_node
2028 && !(processing_template_decl && uses_template_parms (newdecl)))
2029 layout_type (TREE_TYPE (newdecl));
2031 if ((VAR_P (newdecl)
2032 || TREE_CODE (newdecl) == PARM_DECL
2033 || TREE_CODE (newdecl) == RESULT_DECL
2034 || TREE_CODE (newdecl) == FIELD_DECL
2035 || TREE_CODE (newdecl) == TYPE_DECL)
2036 && !(processing_template_decl && uses_template_parms (newdecl)))
2037 layout_decl (newdecl, 0);
2039 /* Merge the type qualifiers. */
2040 if (TREE_READONLY (newdecl))
2041 TREE_READONLY (olddecl) = 1;
2042 if (TREE_THIS_VOLATILE (newdecl))
2043 TREE_THIS_VOLATILE (olddecl) = 1;
2044 if (TREE_NOTHROW (newdecl))
2045 TREE_NOTHROW (olddecl) = 1;
2047 /* Merge deprecatedness. */
2048 if (TREE_DEPRECATED (newdecl))
2049 TREE_DEPRECATED (olddecl) = 1;
2051 /* Preserve function specific target and optimization options */
2052 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2054 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
2055 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
2056 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
2057 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
2059 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
2060 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
2061 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
2062 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
2065 /* Merge the initialization information. */
2066 if (DECL_INITIAL (newdecl) == NULL_TREE
2067 && DECL_INITIAL (olddecl) != NULL_TREE)
2069 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2070 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
2071 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2073 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
2074 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
2078 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2080 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
2081 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
2082 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
2083 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
2084 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
2085 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
2086 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
2087 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
2088 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
2089 DECL_LOOPING_CONST_OR_PURE_P (newdecl)
2090 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl);
2091 /* Keep the old RTL. */
2092 COPY_DECL_RTL (olddecl, newdecl);
2094 else if (VAR_P (newdecl)
2095 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
2097 /* Keep the old RTL. We cannot keep the old RTL if the old
2098 declaration was for an incomplete object and the new
2099 declaration is not since many attributes of the RTL will
2101 COPY_DECL_RTL (olddecl, newdecl);
2104 /* If cannot merge, then use the new type and qualifiers,
2105 and don't preserve the old rtl. */
2108 /* Clean out any memory we had of the old declaration. */
2109 tree oldstatic = value_member (olddecl, static_aggregates);
2111 TREE_VALUE (oldstatic) = error_mark_node;
2113 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
2114 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
2115 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
2116 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
2119 /* Merge the storage class information. */
2120 merge_weak (newdecl, olddecl);
2122 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
2123 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
2124 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
2125 if (! DECL_EXTERNAL (olddecl))
2126 DECL_EXTERNAL (newdecl) = 0;
2128 new_template_info = NULL_TREE;
2129 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
2131 bool new_redefines_gnu_inline = false;
2133 if (new_defines_function
2134 && ((DECL_INTERFACE_KNOWN (olddecl)
2135 && TREE_CODE (olddecl) == FUNCTION_DECL)
2136 || (TREE_CODE (olddecl) == TEMPLATE_DECL
2137 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
2138 == FUNCTION_DECL))))
2142 if (TREE_CODE (fn) == TEMPLATE_DECL)
2143 fn = DECL_TEMPLATE_RESULT (olddecl);
2145 new_redefines_gnu_inline = GNU_INLINE_P (fn) && DECL_INITIAL (fn);
2148 if (!new_redefines_gnu_inline)
2150 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
2151 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
2152 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
2154 DECL_TEMPLATE_INSTANTIATED (newdecl)
2155 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
2156 DECL_ODR_USED (newdecl) |= DECL_ODR_USED (olddecl);
2158 /* If the OLDDECL is an instantiation and/or specialization,
2159 then the NEWDECL must be too. But, it may not yet be marked
2160 as such if the caller has created NEWDECL, but has not yet
2161 figured out that it is a redeclaration. */
2162 if (!DECL_USE_TEMPLATE (newdecl))
2163 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
2165 /* Don't really know how much of the language-specific
2166 values we should copy from old to new. */
2167 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
2168 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
2169 DECL_INITIALIZED_IN_CLASS_P (newdecl)
2170 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
2172 if (LANG_DECL_HAS_MIN (newdecl))
2174 DECL_LANG_SPECIFIC (newdecl)->u.min.u2 =
2175 DECL_LANG_SPECIFIC (olddecl)->u.min.u2;
2176 if (DECL_TEMPLATE_INFO (newdecl))
2178 new_template_info = DECL_TEMPLATE_INFO (newdecl);
2179 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
2180 && DECL_TEMPLATE_SPECIALIZATION (newdecl))
2181 /* Remember the presence of explicit specialization args. */
2182 TINFO_USED_TEMPLATE_ID (DECL_TEMPLATE_INFO (olddecl))
2183 = TINFO_USED_TEMPLATE_ID (new_template_info);
2185 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
2187 /* Only functions have these fields. */
2188 if (DECL_DECLARES_FUNCTION_P (newdecl))
2190 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
2191 DECL_BEFRIENDING_CLASSES (newdecl)
2192 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
2193 DECL_BEFRIENDING_CLASSES (olddecl));
2194 /* DECL_THUNKS is only valid for virtual functions,
2195 otherwise it is a DECL_FRIEND_CONTEXT. */
2196 if (DECL_VIRTUAL_P (newdecl))
2197 SET_DECL_THUNKS (newdecl, DECL_THUNKS (olddecl));
2199 /* Only variables have this field. */
2200 else if (VAR_P (newdecl)
2201 && VAR_HAD_UNKNOWN_BOUND (olddecl))
2202 SET_VAR_HAD_UNKNOWN_BOUND (newdecl);
2205 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2209 /* Merge parameter attributes. */
2210 tree oldarg, newarg;
2211 for (oldarg = DECL_ARGUMENTS(olddecl),
2212 newarg = DECL_ARGUMENTS(newdecl);
2214 oldarg = DECL_CHAIN(oldarg), newarg = DECL_CHAIN(newarg)) {
2215 DECL_ATTRIBUTES (newarg)
2216 = (*targetm.merge_decl_attributes) (oldarg, newarg);
2217 DECL_ATTRIBUTES (oldarg) = DECL_ATTRIBUTES (newarg);
2220 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
2221 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
2223 /* If newdecl is not a specialization, then it is not a
2224 template-related function at all. And that means that we
2225 should have exited above, returning 0. */
2226 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
2228 if (DECL_ODR_USED (olddecl))
2229 /* From [temp.expl.spec]:
2231 If a template, a member template or the member of a class
2232 template is explicitly specialized then that
2233 specialization shall be declared before the first use of
2234 that specialization that would cause an implicit
2235 instantiation to take place, in every translation unit in
2236 which such a use occurs. */
2237 error ("explicit specialization of %qD after first use",
2240 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
2241 DECL_COMDAT (newdecl) = (TREE_PUBLIC (newdecl)
2242 && DECL_DECLARED_INLINE_P (newdecl));
2244 /* Don't propagate visibility from the template to the
2245 specialization here. We'll do that in determine_visibility if
2247 DECL_VISIBILITY_SPECIFIED (olddecl) = 0;
2249 /* [temp.expl.spec/14] We don't inline explicit specialization
2250 just because the primary template says so. */
2252 /* But still keep DECL_DISREGARD_INLINE_LIMITS in sync with
2253 the always_inline attribute. */
2254 if (DECL_DISREGARD_INLINE_LIMITS (olddecl)
2255 && !DECL_DISREGARD_INLINE_LIMITS (newdecl))
2257 if (DECL_DECLARED_INLINE_P (newdecl))
2258 DECL_DISREGARD_INLINE_LIMITS (newdecl) = true;
2260 DECL_ATTRIBUTES (newdecl)
2261 = remove_attribute ("always_inline",
2262 DECL_ATTRIBUTES (newdecl));
2265 else if (new_defines_function && DECL_INITIAL (olddecl))
2267 /* Never inline re-defined extern inline functions.
2268 FIXME: this could be better handled by keeping both
2269 function as separate declarations. */
2270 DECL_UNINLINABLE (newdecl) = 1;
2274 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
2275 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
2277 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
2279 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
2280 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
2282 DECL_DISREGARD_INLINE_LIMITS (newdecl)
2283 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
2284 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
2285 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
2288 /* Preserve abstractness on cloned [cd]tors. */
2289 DECL_ABSTRACT_P (newdecl) = DECL_ABSTRACT_P (olddecl);
2291 /* Update newdecl's parms to point at olddecl. */
2292 for (parm = DECL_ARGUMENTS (newdecl); parm;
2293 parm = DECL_CHAIN (parm))
2294 DECL_CONTEXT (parm) = olddecl;
2298 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
2299 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
2300 COPY_DECL_RTL (newdecl, olddecl);
2302 if (! types_match || new_defines_function)
2304 /* These need to be copied so that the names are available.
2305 Note that if the types do match, we'll preserve inline
2306 info and other bits, but if not, we won't. */
2307 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
2308 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
2310 /* If redeclaring a builtin function, it stays built in
2311 if newdecl is a gnu_inline definition, or if newdecl is just
2313 if (DECL_BUILT_IN (olddecl)
2314 && (new_defines_function ? GNU_INLINE_P (newdecl) : types_match))
2316 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2317 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2318 /* If we're keeping the built-in definition, keep the rtl,
2319 regardless of declaration matches. */
2320 COPY_DECL_RTL (olddecl, newdecl);
2321 if (DECL_BUILT_IN_CLASS (newdecl) == BUILT_IN_NORMAL)
2323 enum built_in_function fncode = DECL_FUNCTION_CODE (newdecl);
2326 /* If a compatible prototype of these builtin functions
2327 is seen, assume the runtime implements it with the
2328 expected semantics. */
2329 case BUILT_IN_STPCPY:
2330 if (builtin_decl_explicit_p (fncode))
2331 set_builtin_decl_implicit_p (fncode, true);
2334 if (builtin_decl_explicit_p (fncode))
2335 set_builtin_decl_declared_p (fncode, true);
2340 if (new_defines_function)
2341 /* If defining a function declared with other language
2342 linkage, use the previously declared language linkage. */
2343 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
2344 else if (types_match)
2346 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2347 /* Don't clear out the arguments if we're just redeclaring a
2349 if (DECL_ARGUMENTS (olddecl))
2350 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2353 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
2354 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
2356 /* Now preserve various other info from the definition. */
2357 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
2358 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
2359 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2360 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2362 /* Warn about conflicting visibility specifications. */
2363 if (DECL_VISIBILITY_SPECIFIED (olddecl)
2364 && DECL_VISIBILITY_SPECIFIED (newdecl)
2365 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2367 if (warning_at (DECL_SOURCE_LOCATION (newdecl), OPT_Wattributes,
2368 "%qD: visibility attribute ignored because it "
2369 "conflicts with previous declaration", newdecl))
2370 inform (DECL_SOURCE_LOCATION (olddecl),
2371 "previous declaration of %qD", olddecl);
2373 /* Choose the declaration which specified visibility. */
2374 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2376 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2377 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2379 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2380 so keep this behavior. */
2381 if (VAR_P (newdecl) && DECL_HAS_INIT_PRIORITY_P (newdecl))
2383 SET_DECL_INIT_PRIORITY (olddecl, DECL_INIT_PRIORITY (newdecl));
2384 DECL_HAS_INIT_PRIORITY_P (olddecl) = 1;
2386 /* Likewise for DECL_ALIGN, DECL_USER_ALIGN and DECL_PACKED. */
2387 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
2389 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
2390 DECL_USER_ALIGN (newdecl) |= DECL_USER_ALIGN (olddecl);
2392 DECL_USER_ALIGN (olddecl) = DECL_USER_ALIGN (newdecl);
2393 if (TREE_CODE (newdecl) == FIELD_DECL)
2394 DECL_PACKED (olddecl) = DECL_PACKED (newdecl);
2396 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2397 with that from NEWDECL below. */
2398 if (DECL_LANG_SPECIFIC (olddecl))
2400 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
2401 != DECL_LANG_SPECIFIC (newdecl));
2402 ggc_free (DECL_LANG_SPECIFIC (olddecl));
2405 /* Merge the USED information. */
2406 if (TREE_USED (olddecl))
2407 TREE_USED (newdecl) = 1;
2408 else if (TREE_USED (newdecl))
2409 TREE_USED (olddecl) = 1;
2410 if (VAR_P (newdecl))
2412 if (DECL_READ_P (olddecl))
2413 DECL_READ_P (newdecl) = 1;
2414 else if (DECL_READ_P (newdecl))
2415 DECL_READ_P (olddecl) = 1;
2417 if (DECL_PRESERVE_P (olddecl))
2418 DECL_PRESERVE_P (newdecl) = 1;
2419 else if (DECL_PRESERVE_P (newdecl))
2420 DECL_PRESERVE_P (olddecl) = 1;
2422 /* Merge the DECL_FUNCTION_VERSIONED information. newdecl will be copied
2423 to olddecl and deleted. */
2424 if (TREE_CODE (newdecl) == FUNCTION_DECL
2425 && DECL_FUNCTION_VERSIONED (olddecl))
2427 /* Set the flag for newdecl so that it gets copied to olddecl. */
2428 DECL_FUNCTION_VERSIONED (newdecl) = 1;
2429 /* newdecl will be purged after copying to olddecl and is no longer
2431 cgraph_node::delete_function_version (newdecl);
2434 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2437 struct symtab_node *snode = symtab_node::get (olddecl);
2439 function_size = sizeof (struct tree_decl_common);
2441 memcpy ((char *) olddecl + sizeof (struct tree_common),
2442 (char *) newdecl + sizeof (struct tree_common),
2443 function_size - sizeof (struct tree_common));
2445 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2446 (char *) newdecl + sizeof (struct tree_decl_common),
2447 sizeof (struct tree_function_decl) - sizeof (struct tree_decl_common));
2449 /* Preserve symtab node mapping. */
2450 olddecl->decl_with_vis.symtab_node = snode;
2452 if (new_template_info)
2453 /* If newdecl is a template instantiation, it is possible that
2454 the following sequence of events has occurred:
2456 o A friend function was declared in a class template. The
2457 class template was instantiated.
2459 o The instantiation of the friend declaration was
2460 recorded on the instantiation list, and is newdecl.
2462 o Later, however, instantiate_class_template called pushdecl
2463 on the newdecl to perform name injection. But, pushdecl in
2464 turn called duplicate_decls when it discovered that another
2465 declaration of a global function with the same name already
2468 o Here, in duplicate_decls, we decided to clobber newdecl.
2470 If we're going to do that, we'd better make sure that
2471 olddecl, and not newdecl, is on the list of
2472 instantiations so that if we try to do the instantiation
2473 again we won't get the clobbered declaration. */
2474 reregister_specialization (newdecl,
2480 size_t size = tree_code_size (TREE_CODE (newdecl));
2482 memcpy ((char *) olddecl + sizeof (struct tree_common),
2483 (char *) newdecl + sizeof (struct tree_common),
2484 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2485 switch (TREE_CODE (newdecl))
2495 struct symtab_node *snode = NULL;
2497 if (TREE_CODE (newdecl) == VAR_DECL
2498 && (TREE_STATIC (olddecl) || TREE_PUBLIC (olddecl) || DECL_EXTERNAL (olddecl)))
2499 snode = symtab_node::get (olddecl);
2500 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2501 (char *) newdecl + sizeof (struct tree_decl_common),
2502 size - sizeof (struct tree_decl_common)
2503 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2504 if (TREE_CODE (newdecl) == VAR_DECL)
2505 olddecl->decl_with_vis.symtab_node = snode;
2509 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2510 (char *) newdecl + sizeof (struct tree_decl_common),
2511 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)
2512 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2517 if (TREE_CODE (newdecl) == FUNCTION_DECL
2518 || TREE_CODE (newdecl) == VAR_DECL)
2520 if (DECL_EXTERNAL (olddecl)
2521 || TREE_PUBLIC (olddecl)
2522 || TREE_STATIC (olddecl))
2524 /* Merge the section attribute.
2525 We want to issue an error if the sections conflict but that must be
2526 done later in decl_attributes since we are called before attributes
2528 if (DECL_SECTION_NAME (newdecl) != NULL)
2529 set_decl_section_name (olddecl, DECL_SECTION_NAME (newdecl));
2531 if (DECL_ONE_ONLY (newdecl))
2533 struct symtab_node *oldsym, *newsym;
2534 if (TREE_CODE (olddecl) == FUNCTION_DECL)
2535 oldsym = cgraph_node::get_create (olddecl);
2537 oldsym = varpool_node::get_create (olddecl);
2538 newsym = symtab_node::get (newdecl);
2539 oldsym->set_comdat_group (newsym->get_comdat_group ());
2543 if (TREE_CODE (newdecl) == VAR_DECL
2544 && DECL_THREAD_LOCAL_P (newdecl))
2545 set_decl_tls_model (olddecl, DECL_TLS_MODEL (newdecl));
2548 DECL_UID (olddecl) = olddecl_uid;
2550 DECL_FRIEND_P (olddecl) = 1;
2553 DECL_ANTICIPATED (olddecl) = 1;
2554 DECL_HIDDEN_FRIEND_P (olddecl) = 1;
2557 /* NEWDECL contains the merged attribute lists.
2558 Update OLDDECL to be the same. */
2559 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2561 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2562 so that encode_section_info has a chance to look at the new decl
2563 flags and attributes. */
2564 if (DECL_RTL_SET_P (olddecl)
2565 && (TREE_CODE (olddecl) == FUNCTION_DECL
2567 && TREE_STATIC (olddecl))))
2568 make_decl_rtl (olddecl);
2570 /* The NEWDECL will no longer be needed. Because every out-of-class
2571 declaration of a member results in a call to duplicate_decls,
2572 freeing these nodes represents in a significant savings.
2574 Before releasing the node, be sore to remove function from symbol
2575 table that might have been inserted there to record comdat group.
2576 Be sure to however do not free DECL_STRUCT_FUNCTION becuase this
2577 structure is shared in between newdecl and oldecl. */
2578 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2579 DECL_STRUCT_FUNCTION (newdecl) = NULL;
2580 if (TREE_CODE (newdecl) == FUNCTION_DECL
2581 || TREE_CODE (newdecl) == VAR_DECL)
2583 struct symtab_node *snode = symtab_node::get (newdecl);
2592 /* Return zero if the declaration NEWDECL is valid
2593 when the declaration OLDDECL (assumed to be for the same name)
2594 has already been seen.
2595 Otherwise return an error message format string with a %s
2596 where the identifier should go. */
2599 redeclaration_error_message (tree newdecl, tree olddecl)
2601 if (TREE_CODE (newdecl) == TYPE_DECL)
2603 /* Because C++ can put things into name space for free,
2604 constructs like "typedef struct foo { ... } foo"
2605 would look like an erroneous redeclaration. */
2606 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
2609 return G_("redefinition of %q#D");
2611 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2613 /* If this is a pure function, its olddecl will actually be
2614 the original initialization to `0' (which we force to call
2615 abort()). Don't complain about redefinition in this case. */
2616 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
2617 && DECL_INITIAL (olddecl) == NULL_TREE)
2620 /* If both functions come from different namespaces, this is not
2621 a redeclaration - this is a conflict with a used function. */
2622 if (DECL_NAMESPACE_SCOPE_P (olddecl)
2623 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
2624 && ! decls_match (olddecl, newdecl))
2625 return G_("%qD conflicts with used function");
2627 /* We'll complain about linkage mismatches in
2628 warn_extern_redeclared_static. */
2630 /* Defining the same name twice is no good. */
2631 if (DECL_INITIAL (olddecl) != NULL_TREE
2632 && DECL_INITIAL (newdecl) != NULL_TREE)
2634 if (DECL_NAME (olddecl) == NULL_TREE)
2635 return G_("%q#D not declared in class");
2636 else if (!GNU_INLINE_P (olddecl)
2637 || GNU_INLINE_P (newdecl))
2638 return G_("redefinition of %q#D");
2641 if (DECL_DECLARED_INLINE_P (olddecl) && DECL_DECLARED_INLINE_P (newdecl))
2643 bool olda = GNU_INLINE_P (olddecl);
2644 bool newa = GNU_INLINE_P (newdecl);
2649 return G_("%q+D redeclared inline with "
2650 "%<gnu_inline%> attribute");
2652 return G_("%q+D redeclared inline without "
2653 "%<gnu_inline%> attribute");
2657 check_abi_tag_redeclaration
2658 (olddecl, lookup_attribute ("abi_tag", DECL_ATTRIBUTES (olddecl)),
2659 lookup_attribute ("abi_tag", DECL_ATTRIBUTES (newdecl)));
2663 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
2667 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
2669 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
2670 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
2671 return G_("redefinition of %q#D");
2675 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
2676 || (DECL_TEMPLATE_RESULT (newdecl)
2677 == DECL_TEMPLATE_RESULT (olddecl)))
2680 nt = DECL_TEMPLATE_RESULT (newdecl);
2681 if (DECL_TEMPLATE_INFO (nt))
2682 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
2683 ot = DECL_TEMPLATE_RESULT (olddecl);
2684 if (DECL_TEMPLATE_INFO (ot))
2685 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
2686 if (DECL_INITIAL (nt) && DECL_INITIAL (ot)
2687 && (!GNU_INLINE_P (ot) || GNU_INLINE_P (nt)))
2688 return G_("redefinition of %q#D");
2690 if (DECL_DECLARED_INLINE_P (ot) && DECL_DECLARED_INLINE_P (nt))
2692 bool olda = GNU_INLINE_P (ot);
2693 bool newa = GNU_INLINE_P (nt);
2698 return G_("%q+D redeclared inline with "
2699 "%<gnu_inline%> attribute");
2701 return G_("%q+D redeclared inline without "
2702 "%<gnu_inline%> attribute");
2706 /* Core issue #226 (C++0x):
2708 If a friend function template declaration specifies a
2709 default template-argument, that declaration shall be a
2710 definition and shall be the only declaration of the
2711 function template in the translation unit. */
2712 if ((cxx_dialect != cxx98)
2713 && TREE_CODE (ot) == FUNCTION_DECL && DECL_FRIEND_P (ot)
2714 && !check_default_tmpl_args (nt, DECL_TEMPLATE_PARMS (newdecl),
2715 /*is_primary=*/true,
2716 /*is_partial=*/false,
2717 /*is_friend_decl=*/2))
2718 return G_("redeclaration of friend %q#D "
2719 "may not have default template arguments");
2723 else if (VAR_P (newdecl)
2724 && DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl)
2725 && (! DECL_LANG_SPECIFIC (olddecl)
2726 || ! CP_DECL_THREADPRIVATE_P (olddecl)
2727 || DECL_THREAD_LOCAL_P (newdecl)))
2729 /* Only variables can be thread-local, and all declarations must
2730 agree on this property. */
2731 if (DECL_THREAD_LOCAL_P (newdecl))
2732 return G_("thread-local declaration of %q#D follows "
2733 "non-thread-local declaration");
2735 return G_("non-thread-local declaration of %q#D follows "
2736 "thread-local declaration");
2738 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2740 /* The objects have been declared at namespace scope. If either
2741 is a member of an anonymous union, then this is an invalid
2742 redeclaration. For example:
2748 if ((VAR_P (newdecl) && DECL_ANON_UNION_VAR_P (newdecl))
2749 || (VAR_P (olddecl) && DECL_ANON_UNION_VAR_P (olddecl)))
2750 return G_("redeclaration of %q#D");
2751 /* If at least one declaration is a reference, there is no
2752 conflict. For example:
2758 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2760 /* Reject two definitions. */
2761 return G_("redefinition of %q#D");
2765 /* Objects declared with block scope: */
2766 /* Reject two definitions, and reject a definition
2767 together with an external reference. */
2768 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2769 return G_("redeclaration of %q#D");
2774 /* Hash and equality functions for the named_label table. */
2777 named_label_hasher::hash (named_label_entry *ent)
2779 return DECL_UID (ent->label_decl);
2783 named_label_hasher::equal (named_label_entry *a, named_label_entry *b)
2785 return a->label_decl == b->label_decl;
2788 /* Create a new label, named ID. */
2791 make_label_decl (tree id, int local_p)
2793 struct named_label_entry *ent;
2796 decl = build_decl (input_location, LABEL_DECL, id, void_type_node);
2798 DECL_CONTEXT (decl) = current_function_decl;
2799 DECL_MODE (decl) = VOIDmode;
2800 C_DECLARED_LABEL_FLAG (decl) = local_p;
2802 /* Say where one reference is to the label, for the sake of the
2803 error if it is not defined. */
2804 DECL_SOURCE_LOCATION (decl) = input_location;
2806 /* Record the fact that this identifier is bound to this label. */
2807 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2809 /* Create the label htab for the function on demand. */
2811 named_labels = hash_table<named_label_hasher>::create_ggc (13);
2813 /* Record this label on the list of labels used in this function.
2814 We do this before calling make_label_decl so that we get the
2815 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2816 ent = ggc_cleared_alloc<named_label_entry> ();
2817 ent->label_decl = decl;
2819 named_label_entry **slot = named_labels->find_slot (ent, INSERT);
2820 gcc_assert (*slot == NULL);
2826 /* Look for a label named ID in the current function. If one cannot
2827 be found, create one. (We keep track of used, but undefined,
2828 labels, and complain about them at the end of a function.) */
2831 lookup_label_1 (tree id)
2835 /* You can't use labels at global scope. */
2836 if (current_function_decl == NULL_TREE)
2838 error ("label %qE referenced outside of any function", id);
2842 /* See if we've already got this label. */
2843 decl = IDENTIFIER_LABEL_VALUE (id);
2844 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2847 decl = make_label_decl (id, /*local_p=*/0);
2851 /* Wrapper for lookup_label_1. */
2854 lookup_label (tree id)
2857 bool subtime = timevar_cond_start (TV_NAME_LOOKUP);
2858 ret = lookup_label_1 (id);
2859 timevar_cond_stop (TV_NAME_LOOKUP, subtime);
2863 /* Declare a local label named ID. */
2866 declare_local_label (tree id)
2869 cp_label_binding bind;
2871 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2872 this scope we can restore the old value of IDENTIFIER_TYPE_VALUE. */
2873 bind.prev_value = IDENTIFIER_LABEL_VALUE (id);
2875 decl = make_label_decl (id, /*local_p=*/1);
2877 vec_safe_push (current_binding_level->shadowed_labels, bind);
2882 /* Returns nonzero if it is ill-formed to jump past the declaration of
2883 DECL. Returns 2 if it's also a real problem. */
2886 decl_jump_unsafe (tree decl)
2888 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
2889 with automatic storage duration is not in scope to a point where it is
2890 in scope is ill-formed unless the variable has scalar type, class type
2891 with a trivial default constructor and a trivial destructor, a
2892 cv-qualified version of one of these types, or an array of one of the
2893 preceding types and is declared without an initializer (8.5). */
2894 tree type = TREE_TYPE (decl);
2896 if (!VAR_P (decl) || TREE_STATIC (decl)
2897 || type == error_mark_node)
2900 if (DECL_NONTRIVIALLY_INITIALIZED_P (decl)
2901 || variably_modified_type_p (type, NULL_TREE))
2904 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
2910 /* A subroutine of check_previous_goto_1 to identify a branch to the user. */
2913 identify_goto (tree decl, const location_t *locus)
2915 bool complained = (decl
2916 ? permerror (input_location, "jump to label %qD", decl)
2917 : permerror (input_location, "jump to case label"));
2918 if (complained && locus)
2919 inform (*locus, " from here");
2923 /* Check that a single previously seen jump to a newly defined label
2924 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2925 the jump context; NAMES are the names in scope in LEVEL at the jump
2926 context; LOCUS is the source position of the jump or 0. Returns
2927 true if all is well. */
2930 check_previous_goto_1 (tree decl, cp_binding_level* level, tree names,
2931 bool exited_omp, const location_t *locus)
2933 cp_binding_level *b;
2934 bool identified = false, complained = false;
2935 bool saw_eh = false, saw_omp = false;
2939 complained = identify_goto (decl, locus);
2941 inform (input_location, " exits OpenMP structured block");
2942 identified = saw_omp = true;
2945 for (b = current_binding_level; b ; b = b->level_chain)
2947 tree new_decls, old_decls = (b == level ? names : NULL_TREE);
2949 for (new_decls = b->names; new_decls != old_decls;
2950 new_decls = (DECL_P (new_decls) ? DECL_CHAIN (new_decls)
2951 : TREE_CHAIN (new_decls)))
2953 int problem = decl_jump_unsafe (new_decls);
2959 complained = identify_goto (decl, locus);
2965 inform (input_location,
2966 " crosses initialization of %q+#D", new_decls);
2968 inform (input_location, " enters scope of %q+#D which has "
2969 "non-trivial destructor", new_decls);
2975 if ((b->kind == sk_try || b->kind == sk_catch) && !saw_eh)
2979 complained = identify_goto (decl, locus);
2984 if (b->kind == sk_try)
2985 inform (input_location, " enters try block");
2987 inform (input_location, " enters catch block");
2991 if (b->kind == sk_omp && !saw_omp)
2995 complained = identify_goto (decl, locus);
2999 inform (input_location, " enters OpenMP structured block");
3008 check_previous_goto (tree decl, struct named_label_use_entry *use)
3010 check_previous_goto_1 (decl, use->binding_level,
3011 use->names_in_scope, use->in_omp_scope,
3012 &use->o_goto_locus);
3016 check_switch_goto (cp_binding_level* level)
3018 return check_previous_goto_1 (NULL_TREE, level, level->names, false, NULL);
3021 /* Check that a new jump to a label DECL is OK. Called by
3022 finish_goto_stmt. */
3025 check_goto (tree decl)
3027 struct named_label_entry *ent, dummy;
3028 bool saw_catch = false, identified = false, complained = false;
3032 /* We can't know where a computed goto is jumping.
3033 So we assume that it's OK. */
3034 if (TREE_CODE (decl) != LABEL_DECL)
3037 /* We didn't record any information about this label when we created it,
3038 and there's not much point since it's trivial to analyze as a return. */
3039 if (decl == cdtor_label)
3042 dummy.label_decl = decl;
3043 ent = named_labels->find (&dummy);
3044 gcc_assert (ent != NULL);
3046 /* If the label hasn't been defined yet, defer checking. */
3047 if (! DECL_INITIAL (decl))
3049 struct named_label_use_entry *new_use;
3051 /* Don't bother creating another use if the last goto had the
3052 same data, and will therefore create the same set of errors. */
3054 && ent->uses->names_in_scope == current_binding_level->names)
3057 new_use = ggc_alloc<named_label_use_entry> ();
3058 new_use->binding_level = current_binding_level;
3059 new_use->names_in_scope = current_binding_level->names;
3060 new_use->o_goto_locus = input_location;
3061 new_use->in_omp_scope = false;
3063 new_use->next = ent->uses;
3064 ent->uses = new_use;
3068 if (ent->in_try_scope || ent->in_catch_scope
3069 || ent->in_omp_scope || !vec_safe_is_empty (ent->bad_decls))
3071 complained = permerror (input_location, "jump to label %q+D", decl);
3073 inform (input_location, " from here");
3077 FOR_EACH_VEC_SAFE_ELT (ent->bad_decls, ix, bad)
3079 int u = decl_jump_unsafe (bad);
3081 if (u > 1 && DECL_ARTIFICIAL (bad))
3083 /* Can't skip init of __exception_info. */
3085 inform (DECL_SOURCE_LOCATION (bad), " enters catch block");
3088 else if (complained)
3091 inform (input_location, " skips initialization of %q+#D", bad);
3093 inform (input_location, " enters scope of %q+#D which has "
3094 "non-trivial destructor", bad);
3100 if (ent->in_try_scope)
3101 inform (input_location, " enters try block");
3102 else if (ent->in_catch_scope && !saw_catch)
3103 inform (input_location, " enters catch block");
3106 if (ent->in_omp_scope)
3109 inform (input_location, " enters OpenMP structured block");
3111 else if (flag_openmp)
3113 cp_binding_level *b;
3114 for (b = current_binding_level; b ; b = b->level_chain)
3116 if (b == ent->binding_level)
3118 if (b->kind == sk_omp)
3122 complained = permerror (input_location,
3123 "jump to label %q+D", decl);
3125 inform (input_location, " from here");
3129 inform (input_location, " exits OpenMP structured block");
3136 /* Check that a return is ok wrt OpenMP structured blocks.
3137 Called by finish_return_stmt. Returns true if all is well. */
3140 check_omp_return (void)
3142 cp_binding_level *b;
3143 for (b = current_binding_level; b ; b = b->level_chain)
3144 if (b->kind == sk_omp)
3146 error ("invalid exit from OpenMP structured block");
3149 else if (b->kind == sk_function_parms)
3154 /* Define a label, specifying the location in the source file.
3155 Return the LABEL_DECL node for the label. */
3158 define_label_1 (location_t location, tree name)
3160 struct named_label_entry *ent, dummy;
3161 cp_binding_level *p;
3164 decl = lookup_label (name);
3166 dummy.label_decl = decl;
3167 ent = named_labels->find (&dummy);
3168 gcc_assert (ent != NULL);
3170 /* After labels, make any new cleanups in the function go into their
3171 own new (temporary) binding contour. */
3172 for (p = current_binding_level;
3173 p->kind != sk_function_parms;
3175 p->more_cleanups_ok = 0;
3177 if (name == get_identifier ("wchar_t"))
3178 permerror (input_location, "label named wchar_t");
3180 if (DECL_INITIAL (decl) != NULL_TREE)
3182 error ("duplicate label %qD", decl);
3183 return error_mark_node;
3187 struct named_label_use_entry *use;
3189 /* Mark label as having been defined. */
3190 DECL_INITIAL (decl) = error_mark_node;
3191 /* Say where in the source. */
3192 DECL_SOURCE_LOCATION (decl) = location;
3194 ent->binding_level = current_binding_level;
3195 ent->names_in_scope = current_binding_level->names;
3197 for (use = ent->uses; use ; use = use->next)
3198 check_previous_goto (decl, use);
3205 /* Wrapper for define_label_1. */
3208 define_label (location_t location, tree name)
3211 bool running = timevar_cond_start (TV_NAME_LOOKUP);
3212 ret = define_label_1 (location, name);
3213 timevar_cond_stop (TV_NAME_LOOKUP, running);
3220 cp_binding_level *level;
3221 struct cp_switch *next;
3222 /* The SWITCH_STMT being built. */
3224 /* A splay-tree mapping the low element of a case range to the high
3225 element, or NULL_TREE if there is no high element. Used to
3226 determine whether or not a new case label duplicates an old case
3227 label. We need a tree, rather than simply a hash table, because
3228 of the GNU case range extension. */
3232 /* A stack of the currently active switch statements. The innermost
3233 switch statement is on the top of the stack. There is no need to
3234 mark the stack for garbage collection because it is only active
3235 during the processing of the body of a function, and we never
3236 collect at that point. */
3238 static struct cp_switch *switch_stack;
3240 /* Called right after a switch-statement condition is parsed.
3241 SWITCH_STMT is the switch statement being parsed. */
3244 push_switch (tree switch_stmt)
3246 struct cp_switch *p = XNEW (struct cp_switch);
3247 p->level = current_binding_level;
3248 p->next = switch_stack;
3249 p->switch_stmt = switch_stmt;
3250 p->cases = splay_tree_new (case_compare, NULL, NULL);
3257 struct cp_switch *cs = switch_stack;
3258 location_t switch_location;
3260 /* Emit warnings as needed. */
3261 switch_location = EXPR_LOC_OR_LOC (cs->switch_stmt, input_location);
3262 if (!processing_template_decl)
3263 c_do_switch_warnings (cs->cases, switch_location,
3264 SWITCH_STMT_TYPE (cs->switch_stmt),
3265 SWITCH_STMT_COND (cs->switch_stmt));
3267 splay_tree_delete (cs->cases);
3268 switch_stack = switch_stack->next;
3272 /* Convert a case constant VALUE in a switch to the type TYPE of the switch
3273 condition. Note that if TYPE and VALUE are already integral we don't
3274 really do the conversion because the language-independent
3275 warning/optimization code will work better that way. */
3278 case_conversion (tree type, tree value)
3280 if (value == NULL_TREE)
3283 if (cxx_dialect >= cxx11
3284 && (SCOPED_ENUM_P (type)
3285 || !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (value))))
3287 if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
3288 type = type_promotes_to (type);
3289 value = (perform_implicit_conversion_flags
3290 (type, value, tf_warning_or_error,
3291 LOOKUP_IMPLICIT | LOOKUP_NO_NON_INTEGRAL));
3293 return cxx_constant_value (value);
3296 /* Note that we've seen a definition of a case label, and complain if this
3297 is a bad place for one. */
3300 finish_case_label (location_t loc, tree low_value, tree high_value)
3303 cp_binding_level *p;
3306 if (processing_template_decl)
3310 /* For templates, just add the case label; we'll do semantic
3311 analysis at instantiation-time. */
3312 label = build_decl (loc, LABEL_DECL, NULL_TREE, NULL_TREE);
3313 return add_stmt (build_case_label (low_value, high_value, label));
3316 /* Find the condition on which this switch statement depends. */
3317 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
3318 if (cond && TREE_CODE (cond) == TREE_LIST)
3319 cond = TREE_VALUE (cond);
3321 if (!check_switch_goto (switch_stack->level))
3322 return error_mark_node;
3324 type = SWITCH_STMT_TYPE (switch_stack->switch_stmt);
3326 low_value = case_conversion (type, low_value);
3327 high_value = case_conversion (type, high_value);
3329 r = c_add_case_label (loc, switch_stack->cases, cond, type,
3330 low_value, high_value);
3332 /* After labels, make any new cleanups in the function go into their
3333 own new (temporary) binding contour. */
3334 for (p = current_binding_level;
3335 p->kind != sk_function_parms;
3337 p->more_cleanups_ok = 0;
3342 struct typename_info {
3350 struct typename_hasher : ggc_hasher<tree>
3352 typedef typename_info *compare_type;
3354 /* Hash a TYPENAME_TYPE. */
3361 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
3362 ^ htab_hash_pointer (TYPE_IDENTIFIER (t)));
3367 /* Compare two TYPENAME_TYPEs. */
3370 equal (tree t1, const typename_info *t2)
3372 return (TYPE_IDENTIFIER (t1) == t2->name
3373 && TYPE_CONTEXT (t1) == t2->scope
3374 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
3375 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
3376 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
3380 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
3381 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
3383 Returns the new TYPENAME_TYPE. */
3385 static GTY (()) hash_table<typename_hasher> *typename_htab;
3388 build_typename_type (tree context, tree name, tree fullname,
3389 enum tag_types tag_type)
3397 if (typename_htab == NULL)
3398 typename_htab = hash_table<typename_hasher>::create_ggc (61);
3400 ti.scope = FROB_CONTEXT (context);
3402 ti.template_id = fullname;
3403 ti.enum_p = tag_type == enum_type;
3404 ti.class_p = (tag_type == class_type
3405 || tag_type == record_type
3406 || tag_type == union_type);
3407 hash = (htab_hash_pointer (ti.scope)
3408 ^ htab_hash_pointer (ti.name));
3410 /* See if we already have this type. */
3411 e = typename_htab->find_slot_with_hash (&ti, hash, INSERT);
3416 /* Build the TYPENAME_TYPE. */
3417 t = cxx_make_type (TYPENAME_TYPE);
3418 TYPE_CONTEXT (t) = ti.scope;
3419 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
3420 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
3421 TYPENAME_IS_CLASS_P (t) = ti.class_p;
3423 /* Build the corresponding TYPE_DECL. */
3424 d = build_decl (input_location, TYPE_DECL, name, t);
3425 TYPE_NAME (TREE_TYPE (d)) = d;
3426 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3427 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3428 DECL_ARTIFICIAL (d) = 1;
3430 /* Store it in the hash table. */
3433 /* TYPENAME_TYPEs must always be compared structurally, because
3434 they may or may not resolve down to another type depending on
3435 the currently open classes. */
3436 SET_TYPE_STRUCTURAL_EQUALITY (t);
3442 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
3443 provided to name the type. Returns an appropriate type, unless an
3444 error occurs, in which case error_mark_node is returned. If we
3445 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
3446 return that, rather than the _TYPE it corresponds to, in other
3447 cases we look through the type decl. If TF_ERROR is set, complain
3448 about errors, otherwise be quiet. */
3451 make_typename_type (tree context, tree name, enum tag_types tag_type,
3452 tsubst_flags_t complain)
3458 if (name == error_mark_node
3459 || context == NULL_TREE
3460 || context == error_mark_node)
3461 return error_mark_node;
3465 if (!(TYPE_LANG_SPECIFIC (name)
3466 && (CLASSTYPE_IS_TEMPLATE (name)
3467 || CLASSTYPE_USE_TEMPLATE (name))))
3468 name = TYPE_IDENTIFIER (name);
3470 /* Create a TEMPLATE_ID_EXPR for the type. */
3471 name = build_nt (TEMPLATE_ID_EXPR,
3472 CLASSTYPE_TI_TEMPLATE (name),
3473 CLASSTYPE_TI_ARGS (name));
3475 else if (TREE_CODE (name) == TYPE_DECL)
3476 name = DECL_NAME (name);
3480 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
3482 name = TREE_OPERAND (name, 0);
3483 if (DECL_TYPE_TEMPLATE_P (name))
3484 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
3485 if (TREE_CODE (name) != IDENTIFIER_NODE)
3487 if (complain & tf_error)
3488 error ("%qD is not a type", name);
3489 return error_mark_node;
3492 if (TREE_CODE (name) == TEMPLATE_DECL)
3494 if (complain & tf_error)
3495 error ("%qD used without template parameters", name);
3496 return error_mark_node;
3498 gcc_assert (identifier_p (name));
3499 gcc_assert (TYPE_P (context));
3501 if (!MAYBE_CLASS_TYPE_P (context))
3503 if (complain & tf_error)
3504 error ("%q#T is not a class", context);
3505 return error_mark_node;
3508 /* When the CONTEXT is a dependent type, NAME could refer to a
3509 dependent base class of CONTEXT. But look inside it anyway
3510 if CONTEXT is a currently open scope, in case it refers to a
3511 member of the current instantiation or a non-dependent base;
3512 lookup will stop when we hit a dependent base. */
3513 if (!dependent_scope_p (context))
3514 /* We should only set WANT_TYPE when we're a nested typename type.
3515 Then we can give better diagnostics if we find a non-type. */
3516 t = lookup_field (context, name, 2, /*want_type=*/true);
3520 if ((!t || TREE_CODE (t) == TREE_LIST) && dependent_type_p (context))
3521 return build_typename_type (context, name, fullname, tag_type);
3523 want_template = TREE_CODE (fullname) == TEMPLATE_ID_EXPR;
3527 if (complain & tf_error)
3528 error (want_template ? G_("no class template named %q#T in %q#T")
3529 : G_("no type named %q#T in %q#T"), name, context);
3530 return error_mark_node;
3533 /* Pull out the template from an injected-class-name (or multiple). */
3535 t = maybe_get_template_decl_from_type_decl (t);
3537 if (TREE_CODE (t) == TREE_LIST)
3539 if (complain & tf_error)
3541 error ("lookup of %qT in %qT is ambiguous", name, context);
3542 print_candidates (t);
3544 return error_mark_node;
3547 if (want_template && !DECL_TYPE_TEMPLATE_P (t))
3549 if (complain & tf_error)
3550 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3552 return error_mark_node;
3554 if (!want_template && TREE_CODE (t) != TYPE_DECL)
3556 if (complain & tf_error)
3557 error ("%<typename %T::%D%> names %q#T, which is not a type",
3559 return error_mark_node;
3562 if (!perform_or_defer_access_check (TYPE_BINFO (context), t, t, complain))
3563 return error_mark_node;
3565 /* If we are currently parsing a template and if T is a typedef accessed
3566 through CONTEXT then we need to remember and check access of T at
3567 template instantiation time. */
3568 add_typedef_to_current_template_for_access_check (t, context, input_location);
3571 return lookup_template_class (t, TREE_OPERAND (fullname, 1),
3573 /*entering_scope=*/0,
3574 complain | tf_user);
3576 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
3579 maybe_record_typedef_use (t);
3584 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3585 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3586 in which case error_mark_node is returned.
3588 If PARM_LIST is non-NULL, also make sure that the template parameter
3589 list of TEMPLATE_DECL matches.
3591 If COMPLAIN zero, don't complain about any errors that occur. */
3594 make_unbound_class_template (tree context, tree name, tree parm_list,
3595 tsubst_flags_t complain)
3601 name = TYPE_IDENTIFIER (name);
3602 else if (DECL_P (name))
3603 name = DECL_NAME (name);
3604 gcc_assert (identifier_p (name));
3606 if (!dependent_type_p (context)
3607 || currently_open_class (context))
3609 tree tmpl = NULL_TREE;
3611 if (MAYBE_CLASS_TYPE_P (context))
3612 tmpl = lookup_field (context, name, 0, false);
3614 if (tmpl && TREE_CODE (tmpl) == TYPE_DECL)
3615 tmpl = maybe_get_template_decl_from_type_decl (tmpl);
3617 if (!tmpl || !DECL_TYPE_TEMPLATE_P (tmpl))
3619 if (complain & tf_error)
3620 error ("no class template named %q#T in %q#T", name, context);
3621 return error_mark_node;
3625 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
3627 if (complain & tf_error)
3629 error ("template parameters do not match template %qD", tmpl);
3630 inform (DECL_SOURCE_LOCATION (tmpl),
3631 "%qD declared here", tmpl);
3633 return error_mark_node;
3636 if (!perform_or_defer_access_check (TYPE_BINFO (context), tmpl, tmpl,
3638 return error_mark_node;
3643 /* Build the UNBOUND_CLASS_TEMPLATE. */
3644 t = cxx_make_type (UNBOUND_CLASS_TEMPLATE);
3645 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
3646 TREE_TYPE (t) = NULL_TREE;
3647 SET_TYPE_STRUCTURAL_EQUALITY (t);
3649 /* Build the corresponding TEMPLATE_DECL. */
3650 d = build_decl (input_location, TEMPLATE_DECL, name, t);
3651 TYPE_NAME (TREE_TYPE (d)) = d;
3652 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3653 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3654 DECL_ARTIFICIAL (d) = 1;
3655 DECL_TEMPLATE_PARMS (d) = parm_list;
3662 /* Push the declarations of builtin types into the namespace.
3663 RID_INDEX is the index of the builtin type in the array
3664 RID_POINTERS. NAME is the name used when looking up the builtin
3665 type. TYPE is the _TYPE node for the builtin type. */
3668 record_builtin_type (enum rid rid_index,
3672 tree rname = NULL_TREE, tname = NULL_TREE;
3673 tree tdecl = NULL_TREE;
3675 if ((int) rid_index < (int) RID_MAX)
3676 rname = ridpointers[(int) rid_index];
3678 tname = get_identifier (name);
3680 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
3681 eliminated. Built-in types should not be looked up name; their
3682 names are keywords that the parser can recognize. However, there
3683 is code in c-common.c that uses identifier_global_value to look
3684 up built-in types by name. */
3687 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, tname, type);
3688 DECL_ARTIFICIAL (tdecl) = 1;
3689 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
3695 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, rname, type);
3696 DECL_ARTIFICIAL (tdecl) = 1;
3698 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
3701 if (!TYPE_NAME (type))
3702 TYPE_NAME (type) = tdecl;
3705 debug_hooks->type_decl (tdecl, 0);
3708 /* Record one of the standard Java types.
3709 * Declare it as having the given NAME.
3710 * If SIZE > 0, it is the size of one of the integral types;
3711 * otherwise it is the negative of the size of one of the other types. */
3714 record_builtin_java_type (const char* name, int size)
3719 type = build_nonstandard_integer_type (size, 0);
3720 type = build_distinct_type_copy (type);
3722 else if (size > -32)
3725 /* "__java_char" or ""__java_boolean". */
3726 type = build_nonstandard_integer_type (-size, 1);
3727 type = build_distinct_type_copy (type);
3728 /* Get the signed type cached and attached to the unsigned type,
3729 so it doesn't get garbage-collected at "random" times,
3730 causing potential codegen differences out of different UIDs
3731 and different alias set numbers. */
3732 stype = build_nonstandard_integer_type (-size, 0);
3733 stype = build_distinct_type_copy (stype);
3734 TREE_CHAIN (type) = stype;
3735 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
3738 { /* "__java_float" or ""__java_double". */
3739 type = make_node (REAL_TYPE);
3740 TYPE_PRECISION (type) = - size;
3743 record_builtin_type (RID_MAX, name, type);
3744 decl = TYPE_NAME (type);
3746 /* Suppress generate debug symbol entries for these types,
3747 since for normal C++ they are just clutter.
3748 However, push_lang_context undoes this if extern "Java" is seen. */
3749 DECL_IGNORED_P (decl) = 1;
3751 TYPE_FOR_JAVA (type) = 1;
3755 /* Push a type into the namespace so that the back ends ignore it. */
3758 record_unknown_type (tree type, const char* name)
3760 tree decl = pushdecl (build_decl (UNKNOWN_LOCATION,
3761 TYPE_DECL, get_identifier (name), type));
3762 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3763 DECL_IGNORED_P (decl) = 1;
3764 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
3765 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
3766 TYPE_ALIGN (type) = 1;
3767 TYPE_USER_ALIGN (type) = 0;
3768 SET_TYPE_MODE (type, TYPE_MODE (void_type_node));
3771 /* A string for which we should create an IDENTIFIER_NODE at
3774 typedef struct predefined_identifier
3776 /* The name of the identifier. */
3777 const char *const name;
3778 /* The place where the IDENTIFIER_NODE should be stored. */
3780 /* Nonzero if this is the name of a constructor or destructor. */
3781 const int ctor_or_dtor_p;
3782 } predefined_identifier;
3784 /* Create all the predefined identifiers. */
3787 initialize_predefined_identifiers (void)
3789 const predefined_identifier *pid;
3791 /* A table of identifiers to create at startup. */
3792 static const predefined_identifier predefined_identifiers[] = {
3793 { "C++", &lang_name_cplusplus, 0 },
3794 { "C", &lang_name_c, 0 },
3795 { "Java", &lang_name_java, 0 },
3796 /* Some of these names have a trailing space so that it is
3797 impossible for them to conflict with names written by users. */
3798 { "__ct ", &ctor_identifier, 1 },
3799 { "__base_ctor ", &base_ctor_identifier, 1 },
3800 { "__comp_ctor ", &complete_ctor_identifier, 1 },
3801 { "__dt ", &dtor_identifier, 1 },
3802 { "__comp_dtor ", &complete_dtor_identifier, 1 },
3803 { "__base_dtor ", &base_dtor_identifier, 1 },
3804 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
3805 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
3806 { "nelts", &nelts_identifier, 0 },
3807 { THIS_NAME, &this_identifier, 0 },
3808 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
3809 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
3810 { "_vptr", &vptr_identifier, 0 },
3811 { "__vtt_parm", &vtt_parm_identifier, 0 },
3812 { "::", &global_scope_name, 0 },
3813 { "std", &std_identifier, 0 },
3817 for (pid = predefined_identifiers; pid->name; ++pid)
3819 *pid->node = get_identifier (pid->name);
3820 if (pid->ctor_or_dtor_p)
3821 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
3825 /* Create the predefined scalar types of C,
3826 and some nodes representing standard constants (0, 1, (void *)0).
3827 Initialize the global binding level.
3828 Make definitions for built-in primitive functions. */
3831 cxx_init_decl_processing (void)
3834 tree void_ftype_ptr;
3836 /* Create all the identifiers we need. */
3837 initialize_predefined_identifiers ();
3839 /* Create the global variables. */
3840 push_to_top_level ();
3842 current_function_decl = NULL_TREE;
3843 current_binding_level = NULL;
3844 /* Enter the global namespace. */
3845 gcc_assert (global_namespace == NULL_TREE);
3846 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
3848 DECL_CONTEXT (global_namespace) = build_translation_unit_decl (NULL_TREE);
3849 debug_hooks->register_main_translation_unit
3850 (DECL_CONTEXT (global_namespace));
3851 TREE_PUBLIC (global_namespace) = 1;
3852 begin_scope (sk_namespace, global_namespace);
3854 if (flag_visibility_ms_compat)
3855 default_visibility = VISIBILITY_HIDDEN;
3858 current_lang_name = lang_name_c;
3860 /* Create the `std' namespace. */
3861 push_namespace (std_identifier);
3862 std_node = current_namespace;
3865 c_common_nodes_and_builtins ();
3867 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
3868 java_short_type_node = record_builtin_java_type ("__java_short", 16);
3869 java_int_type_node = record_builtin_java_type ("__java_int", 32);
3870 java_long_type_node = record_builtin_java_type ("__java_long", 64);
3871 java_float_type_node = record_builtin_java_type ("__java_float", -32);
3872 java_double_type_node = record_builtin_java_type ("__java_double", -64);
3873 java_char_type_node = record_builtin_java_type ("__java_char", -16);
3874 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
3876 integer_two_node = build_int_cst (NULL_TREE, 2);
3878 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
3879 truthvalue_type_node = boolean_type_node;
3880 truthvalue_false_node = boolean_false_node;
3881 truthvalue_true_node = boolean_true_node;
3883 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
3884 noexcept_true_spec = build_tree_list (boolean_true_node, NULL_TREE);
3885 noexcept_false_spec = build_tree_list (boolean_false_node, NULL_TREE);
3888 record_builtin_type (RID_MAX, NULL, string_type_node);
3891 delta_type_node = ptrdiff_type_node;
3892 vtable_index_type = ptrdiff_type_node;
3894 vtt_parm_type = build_pointer_type (const_ptr_type_node);
3895 void_ftype = build_function_type_list (void_type_node, NULL_TREE);
3896 void_ftype_ptr = build_function_type_list (void_type_node,
3897 ptr_type_node, NULL_TREE);
3899 = build_exception_variant (void_ftype_ptr, empty_except_spec);
3901 /* C++ extensions */
3903 unknown_type_node = make_node (LANG_TYPE);
3904 record_unknown_type (unknown_type_node, "unknown type");
3906 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3907 TREE_TYPE (unknown_type_node) = unknown_type_node;
3909 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3911 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
3912 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
3914 init_list_type_node = make_node (LANG_TYPE);
3915 record_unknown_type (init_list_type_node, "init list");
3918 /* Make sure we get a unique function type, so we can give
3919 its pointer type a name. (This wins for gdb.) */
3920 tree vfunc_type = make_node (FUNCTION_TYPE);
3921 TREE_TYPE (vfunc_type) = integer_type_node;
3922 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
3923 layout_type (vfunc_type);
3925 vtable_entry_type = build_pointer_type (vfunc_type);
3927 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
3930 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
3931 layout_type (vtbl_type_node);
3932 vtbl_type_node = cp_build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
3933 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
3934 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
3935 layout_type (vtbl_ptr_type_node);
3936 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
3938 push_namespace (get_identifier ("__cxxabiv1"));
3939 abi_node = current_namespace;
3942 global_type_node = make_node (LANG_TYPE);
3943 record_unknown_type (global_type_node, "global type");
3946 current_lang_name = lang_name_cplusplus;
3949 tree newattrs, extvisattr;
3950 tree newtype, deltype;
3951 tree ptr_ftype_sizetype;
3955 = build_function_type_list (ptr_type_node, size_type_node, NULL_TREE);
3956 if (cxx_dialect == cxx98)
3959 tree bad_alloc_type_node;
3960 tree bad_alloc_decl;
3962 push_namespace (std_identifier);
3963 bad_alloc_id = get_identifier ("bad_alloc");
3964 bad_alloc_type_node = make_class_type (RECORD_TYPE);
3965 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3967 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3968 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3972 = add_exception_specifier (NULL_TREE, bad_alloc_type_node, -1);
3975 new_eh_spec = noexcept_false_spec;
3977 /* Ensure attribs.c is initialized. */
3979 extvisattr = build_tree_list (get_identifier ("externally_visible"),
3981 newattrs = tree_cons (get_identifier ("alloc_size"),
3982 build_tree_list (NULL_TREE, integer_one_node),
3984 newtype = cp_build_type_attribute_variant (ptr_ftype_sizetype, newattrs);
3985 newtype = build_exception_variant (newtype, new_eh_spec);
3986 deltype = cp_build_type_attribute_variant (void_ftype_ptr, extvisattr);
3987 deltype = build_exception_variant (deltype, empty_except_spec);
3988 tree opnew = push_cp_library_fn (NEW_EXPR, newtype, 0);
3989 DECL_IS_MALLOC (opnew) = 1;
3990 DECL_IS_OPERATOR_NEW (opnew) = 1;
3991 opnew = push_cp_library_fn (VEC_NEW_EXPR, newtype, 0);
3992 DECL_IS_MALLOC (opnew) = 1;
3993 DECL_IS_OPERATOR_NEW (opnew) = 1;
3994 push_cp_library_fn (DELETE_EXPR, deltype, ECF_NOTHROW);
3995 push_cp_library_fn (VEC_DELETE_EXPR, deltype, ECF_NOTHROW);
3996 if (flag_sized_deallocation)
3998 /* Also push the sized deallocation variants:
3999 void operator delete(void*, std::size_t) throw();
4000 void operator delete[](void*, std::size_t) throw(); */
4001 tree void_ftype_ptr_size
4002 = build_function_type_list (void_type_node, ptr_type_node,
4003 size_type_node, NULL_TREE);
4004 deltype = cp_build_type_attribute_variant (void_ftype_ptr_size,
4006 deltype = build_exception_variant (deltype, empty_except_spec);
4007 push_cp_library_fn (DELETE_EXPR, deltype, ECF_NOTHROW);
4008 push_cp_library_fn (VEC_DELETE_EXPR, deltype, ECF_NOTHROW);
4011 nullptr_type_node = make_node (NULLPTR_TYPE);
4012 TYPE_SIZE (nullptr_type_node) = bitsize_int (GET_MODE_BITSIZE (ptr_mode));
4013 TYPE_SIZE_UNIT (nullptr_type_node) = size_int (GET_MODE_SIZE (ptr_mode));
4014 TYPE_UNSIGNED (nullptr_type_node) = 1;
4015 TYPE_PRECISION (nullptr_type_node) = GET_MODE_BITSIZE (ptr_mode);
4016 if (abi_version_at_least (9))
4017 TYPE_ALIGN (nullptr_type_node) = GET_MODE_ALIGNMENT (ptr_mode);
4018 SET_TYPE_MODE (nullptr_type_node, ptr_mode);
4019 record_builtin_type (RID_MAX, "decltype(nullptr)", nullptr_type_node);
4020 nullptr_node = build_int_cst (nullptr_type_node, 0);
4024 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype,
4025 ECF_NORETURN | ECF_NOTHROW);
4027 /* Perform other language dependent initializations. */
4028 init_class_processing ();
4029 init_rtti_processing ();
4030 init_template_processing ();
4032 if (flag_exceptions)
4033 init_exception_processing ();
4035 if (! supports_one_only ())
4038 make_fname_decl = cp_make_fname_decl;
4039 start_fname_decls ();
4041 /* Show we use EH for cleanups. */
4042 if (flag_exceptions)
4043 using_eh_for_cleanups ();
4046 /* Generate an initializer for a function naming variable from
4047 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
4048 filled in with the type of the init. */
4051 cp_fname_init (const char* name, tree *type_p)
4053 tree domain = NULL_TREE;
4055 tree init = NULL_TREE;
4060 length = strlen (name);
4061 domain = build_index_type (size_int (length));
4062 init = build_string (length + 1, name);
4065 type = cp_build_qualified_type (char_type_node, TYPE_QUAL_CONST);
4066 type = build_cplus_array_type (type, domain);
4071 TREE_TYPE (init) = type;
4073 init = error_mark_node;
4078 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
4079 the decl, LOC is the location to give the decl, NAME is the
4080 initialization string and TYPE_DEP indicates whether NAME depended
4081 on the type of the function. We make use of that to detect
4082 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
4083 at the point of first use, so we mustn't push the decl now. */
4086 cp_make_fname_decl (location_t loc, tree id, int type_dep)
4088 const char *const name = (type_dep && processing_template_decl
4089 ? NULL : fname_as_string (type_dep));
4091 tree init = cp_fname_init (name, &type);
4092 tree decl = build_decl (loc, VAR_DECL, id, type);
4095 free (CONST_CAST (char *, name));
4097 /* As we're using pushdecl_with_scope, we must set the context. */
4098 DECL_CONTEXT (decl) = current_function_decl;
4100 TREE_STATIC (decl) = 1;
4101 TREE_READONLY (decl) = 1;
4102 DECL_ARTIFICIAL (decl) = 1;
4104 TREE_USED (decl) = 1;
4106 if (current_function_decl)
4108 cp_binding_level *b = current_binding_level;
4109 if (b->kind == sk_function_parms)
4110 return error_mark_node;
4111 while (b->level_chain->kind != sk_function_parms)
4113 pushdecl_with_scope (decl, b, /*is_friend=*/false);
4114 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, NULL_TREE,
4115 LOOKUP_ONLYCONVERTING);
4119 DECL_THIS_STATIC (decl) = true;
4120 pushdecl_top_level_and_finish (decl, init);
4127 builtin_function_1 (tree decl, tree context, bool is_global)
4129 tree id = DECL_NAME (decl);
4130 const char *name = IDENTIFIER_POINTER (id);
4132 retrofit_lang_decl (decl);
4134 DECL_ARTIFICIAL (decl) = 1;
4135 SET_OVERLOADED_OPERATOR_CODE (decl, ERROR_MARK);
4136 SET_DECL_LANGUAGE (decl, lang_c);
4137 /* Runtime library routines are, by definition, available in an
4138 external shared object. */
4139 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
4140 DECL_VISIBILITY_SPECIFIED (decl) = 1;
4142 DECL_CONTEXT (decl) = context;
4145 pushdecl_top_level (decl);
4149 /* A function in the user's namespace should have an explicit
4150 declaration before it is used. Mark the built-in function as
4151 anticipated but not actually declared. */
4152 if (name[0] != '_' || name[1] != '_')
4153 DECL_ANTICIPATED (decl) = 1;
4154 else if (strncmp (name + 2, "builtin_", strlen ("builtin_")) != 0)
4156 size_t len = strlen (name);
4158 /* Treat __*_chk fortification functions as anticipated as well,
4159 unless they are __builtin_*. */
4160 if (len > strlen ("___chk")
4161 && memcmp (name + len - strlen ("_chk"),
4162 "_chk", strlen ("_chk") + 1) == 0)
4163 DECL_ANTICIPATED (decl) = 1;
4170 cxx_builtin_function (tree decl)
4172 tree id = DECL_NAME (decl);
4173 const char *name = IDENTIFIER_POINTER (id);
4174 /* All builtins that don't begin with an '_' should additionally
4175 go in the 'std' namespace. */
4178 tree decl2 = copy_node(decl);
4179 push_namespace (std_identifier);
4180 builtin_function_1 (decl2, std_node, false);
4184 return builtin_function_1 (decl, NULL_TREE, false);
4187 /* Like cxx_builtin_function, but guarantee the function is added to the global
4188 scope. This is to allow function specific options to add new machine
4189 dependent builtins when the target ISA changes via attribute((target(...)))
4190 which saves space on program startup if the program does not use non-generic
4194 cxx_builtin_function_ext_scope (tree decl)
4197 tree id = DECL_NAME (decl);
4198 const char *name = IDENTIFIER_POINTER (id);
4199 /* All builtins that don't begin with an '_' should additionally
4200 go in the 'std' namespace. */
4203 tree decl2 = copy_node(decl);
4204 push_namespace (std_identifier);
4205 builtin_function_1 (decl2, std_node, true);
4209 return builtin_function_1 (decl, NULL_TREE, true);
4212 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
4213 function. Not called directly. */
4216 build_library_fn (tree name, enum tree_code operator_code, tree type,
4219 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
4220 DECL_EXTERNAL (fn) = 1;
4221 TREE_PUBLIC (fn) = 1;
4222 DECL_ARTIFICIAL (fn) = 1;
4223 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
4224 SET_DECL_LANGUAGE (fn, lang_c);
4225 /* Runtime library routines are, by definition, available in an
4226 external shared object. */
4227 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
4228 DECL_VISIBILITY_SPECIFIED (fn) = 1;
4229 set_call_expr_flags (fn, ecf_flags);
4233 /* Returns the _DECL for a library function with C++ linkage. */
4236 build_cp_library_fn (tree name, enum tree_code operator_code, tree type,
4239 tree fn = build_library_fn (name, operator_code, type, ecf_flags);
4240 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
4241 SET_DECL_LANGUAGE (fn, lang_cplusplus);
4245 /* Like build_library_fn, but takes a C string instead of an
4249 build_library_fn_ptr (const char* name, tree type, int ecf_flags)
4251 return build_library_fn (get_identifier (name), ERROR_MARK, type, ecf_flags);
4254 /* Like build_cp_library_fn, but takes a C string instead of an
4258 build_cp_library_fn_ptr (const char* name, tree type, int ecf_flags)
4260 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type,
4264 /* Like build_library_fn, but also pushes the function so that we will
4265 be able to find it via IDENTIFIER_GLOBAL_VALUE. Also, the function
4266 may throw exceptions listed in RAISES. */
4269 push_library_fn (tree name, tree type, tree raises, int ecf_flags)
4274 type = build_exception_variant (type, raises);
4276 fn = build_library_fn (name, ERROR_MARK, type, ecf_flags);
4277 pushdecl_top_level (fn);
4281 /* Like build_cp_library_fn, but also pushes the function so that it
4282 will be found by normal lookup. */
4285 push_cp_library_fn (enum tree_code operator_code, tree type,
4288 tree fn = build_cp_library_fn (ansi_opname (operator_code),
4293 apply_tm_attr (fn, get_identifier ("transaction_safe"));
4297 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
4301 push_void_library_fn (tree name, tree parmtypes, int ecf_flags)
4303 tree type = build_function_type (void_type_node, parmtypes);
4304 return push_library_fn (name, type, NULL_TREE, ecf_flags);
4307 /* Like push_library_fn, but also note that this function throws
4308 and does not return. Used for __throw_foo and the like. */
4311 push_throw_library_fn (tree name, tree type)
4313 tree fn = push_library_fn (name, type, NULL_TREE, ECF_NORETURN);
4317 /* When we call finish_struct for an anonymous union, we create
4318 default copy constructors and such. But, an anonymous union
4319 shouldn't have such things; this function undoes the damage to the
4320 anonymous union type T.
4322 (The reason that we create the synthesized methods is that we don't
4323 distinguish `union { int i; }' from `typedef union { int i; } U'.
4324 The first is an anonymous union; the second is just an ordinary
4328 fixup_anonymous_aggr (tree t)
4332 /* Wipe out memory of synthesized methods. */
4333 TYPE_HAS_USER_CONSTRUCTOR (t) = 0;
4334 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
4335 TYPE_HAS_COPY_CTOR (t) = 0;
4336 TYPE_HAS_CONST_COPY_CTOR (t) = 0;
4337 TYPE_HAS_COPY_ASSIGN (t) = 0;
4338 TYPE_HAS_CONST_COPY_ASSIGN (t) = 0;
4340 /* Splice the implicitly generated functions out of the TYPE_METHODS
4342 q = &TYPE_METHODS (t);
4345 if (DECL_ARTIFICIAL (*q))
4346 *q = TREE_CHAIN (*q);
4348 q = &DECL_CHAIN (*q);
4351 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
4352 if (TYPE_METHODS (t))
4354 tree decl = TYPE_MAIN_DECL (t);
4356 if (TREE_CODE (t) != UNION_TYPE)
4357 error_at (DECL_SOURCE_LOCATION (decl),
4358 "an anonymous struct cannot have function members");
4360 error_at (DECL_SOURCE_LOCATION (decl),
4361 "an anonymous union cannot have function members");
4364 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
4365 assignment operators (because they cannot have these methods themselves).
4366 For anonymous unions this is already checked because they are not allowed
4367 in any union, otherwise we have to check it. */
4368 if (TREE_CODE (t) != UNION_TYPE)
4372 for (field = TYPE_FIELDS (t); field; field = DECL_CHAIN (field))
4373 if (TREE_CODE (field) == FIELD_DECL)
4375 type = TREE_TYPE (field);
4376 if (CLASS_TYPE_P (type))
4378 if (TYPE_NEEDS_CONSTRUCTING (type))
4379 error ("member %q+#D with constructor not allowed "
4380 "in anonymous aggregate", field);
4381 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
4382 error ("member %q+#D with destructor not allowed "
4383 "in anonymous aggregate", field);
4384 if (TYPE_HAS_COMPLEX_COPY_ASSIGN (type))
4385 error ("member %q+#D with copy assignment operator "
4386 "not allowed in anonymous aggregate", field);
4392 /* Warn for an attribute located at LOCATION that appertains to the
4393 class type CLASS_TYPE that has not been properly placed after its
4394 class-key, in it class-specifier. */
4397 warn_misplaced_attr_for_class_type (source_location location,
4400 gcc_assert (OVERLOAD_TYPE_P (class_type));
4402 if (warning_at (location, OPT_Wattributes,
4403 "attribute ignored in declaration "
4404 "of %q#T", class_type))
4406 "attribute for %q#T must follow the %qs keyword",
4407 class_type, class_key_or_enum_as_string (class_type));
4410 /* Make sure that a declaration with no declarator is well-formed, i.e.
4411 just declares a tagged type or anonymous union.
4413 Returns the type declared; or NULL_TREE if none. */
4416 check_tag_decl (cp_decl_specifier_seq *declspecs,
4417 bool explicit_type_instantiation_p)
4419 int saw_friend = decl_spec_seq_has_spec_p (declspecs, ds_friend);
4420 int saw_typedef = decl_spec_seq_has_spec_p (declspecs, ds_typedef);
4421 /* If a class, struct, or enum type is declared by the DECLSPECS
4422 (i.e, if a class-specifier, enum-specifier, or non-typename
4423 elaborated-type-specifier appears in the DECLSPECS),
4424 DECLARED_TYPE is set to the corresponding type. */
4425 tree declared_type = NULL_TREE;
4426 bool error_p = false;
4428 if (declspecs->multiple_types_p)
4429 error ("multiple types in one declaration");
4430 else if (declspecs->redefined_builtin_type)
4432 if (!in_system_header_at (input_location))
4433 permerror (declspecs->locations[ds_redefined_builtin_type_spec],
4434 "redeclaration of C++ built-in type %qT",
4435 declspecs->redefined_builtin_type);
4440 && TYPE_P (declspecs->type)
4441 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
4442 && MAYBE_CLASS_TYPE_P (declspecs->type))
4443 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
4444 declared_type = declspecs->type;
4445 else if (declspecs->type == error_mark_node)
4447 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
4448 permerror (input_location, "declaration does not declare anything");
4449 else if (declared_type != NULL_TREE && type_uses_auto (declared_type))
4451 error ("%<auto%> can only be specified for variables "
4452 "or function declarations");
4453 return error_mark_node;
4455 /* Check for an anonymous union. */
4456 else if (declared_type && RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type))
4457 && TYPE_ANONYMOUS_P (declared_type))
4459 /* 7/3 In a simple-declaration, the optional init-declarator-list
4460 can be omitted only when declaring a class (clause 9) or
4461 enumeration (7.2), that is, when the decl-specifier-seq contains
4462 either a class-specifier, an elaborated-type-specifier with
4463 a class-key (9.1), or an enum-specifier. In these cases and
4464 whenever a class-specifier or enum-specifier is present in the
4465 decl-specifier-seq, the identifiers in these specifiers are among
4466 the names being declared by the declaration (as class-name,
4467 enum-names, or enumerators, depending on the syntax). In such
4468 cases, and except for the declaration of an unnamed bit-field (9.6),
4469 the decl-specifier-seq shall introduce one or more names into the
4470 program, or shall redeclare a name introduced by a previous
4471 declaration. [Example:
4472 enum { }; // ill-formed
4473 typedef class { }; // ill-formed
4477 error ("missing type-name in typedef-declaration");
4480 /* Anonymous unions are objects, so they can have specifiers. */;
4481 SET_ANON_AGGR_TYPE_P (declared_type);
4483 if (TREE_CODE (declared_type) != UNION_TYPE
4484 && !in_system_header_at (input_location))
4485 pedwarn (input_location, OPT_Wpedantic, "ISO C++ prohibits anonymous structs");
4490 if (decl_spec_seq_has_spec_p (declspecs, ds_inline)
4491 || decl_spec_seq_has_spec_p (declspecs, ds_virtual))
4492 error ("%qs can only be specified for functions",
4493 decl_spec_seq_has_spec_p (declspecs, ds_inline)
4494 ? "inline" : "virtual");
4496 && (!current_class_type
4497 || current_scope () != current_class_type))
4498 error ("%<friend%> can only be specified inside a class");
4499 else if (decl_spec_seq_has_spec_p (declspecs, ds_explicit))
4500 error ("%<explicit%> can only be specified for constructors");
4501 else if (declspecs->storage_class)
4502 error ("a storage class can only be specified for objects "
4504 else if (decl_spec_seq_has_spec_p (declspecs, ds_const)
4505 || decl_spec_seq_has_spec_p (declspecs, ds_volatile)
4506 || decl_spec_seq_has_spec_p (declspecs, ds_restrict)
4507 || decl_spec_seq_has_spec_p (declspecs, ds_thread))
4508 error ("qualifiers can only be specified for objects "
4510 else if (saw_typedef)
4511 warning (0, "%<typedef%> was ignored in this declaration");
4512 else if (decl_spec_seq_has_spec_p (declspecs, ds_constexpr))
4513 error ("%<constexpr%> cannot be used for type declarations");
4516 if (declspecs->attributes && warn_attributes && declared_type)
4519 if (!CLASS_TYPE_P (declared_type)
4520 || !CLASSTYPE_TEMPLATE_INSTANTIATION (declared_type))
4521 /* For a non-template class, use the name location. */
4522 loc = location_of (declared_type);
4524 /* For a template class (an explicit instantiation), use the
4525 current location. */
4526 loc = input_location;
4528 if (explicit_type_instantiation_p)
4529 /* [dcl.attr.grammar]/4:
4531 No attribute-specifier-seq shall appertain to an explicit
4534 if (warning_at (loc, OPT_Wattributes,
4535 "attribute ignored in explicit instantiation %q#T",
4538 "no attribute can be applied to "
4539 "an explicit instantiation");
4542 warn_misplaced_attr_for_class_type (loc, declared_type);
4545 return declared_type;
4548 /* Called when a declaration is seen that contains no names to declare.
4549 If its type is a reference to a structure, union or enum inherited
4550 from a containing scope, shadow that tag name for the current scope
4551 with a forward reference.
4552 If its type defines a new named structure or union
4553 or defines an enum, it is valid but we need not do anything here.
4554 Otherwise, it is an error.
4556 C++: may have to grok the declspecs to learn about static,
4557 complain for anonymous unions.
4559 Returns the TYPE declared -- or NULL_TREE if none. */
4562 shadow_tag (cp_decl_specifier_seq *declspecs)
4564 tree t = check_tag_decl (declspecs,
4565 /*explicit_type_instantiation_p=*/false);
4570 if (maybe_process_partial_specialization (t) == error_mark_node)
4573 /* This is where the variables in an anonymous union are
4574 declared. An anonymous union declaration looks like:
4576 because there is no declarator after the union, the parser
4577 sends that declaration here. */
4578 if (ANON_AGGR_TYPE_P (t))
4580 fixup_anonymous_aggr (t);
4582 if (TYPE_FIELDS (t))
4584 tree decl = grokdeclarator (/*declarator=*/NULL,
4585 declspecs, NORMAL, 0, NULL);
4586 finish_anon_union (decl);
4593 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4596 groktypename (cp_decl_specifier_seq *type_specifiers,
4597 const cp_declarator *declarator,
4598 bool is_template_arg)
4602 enum decl_context context
4603 = is_template_arg ? TEMPLATE_TYPE_ARG : TYPENAME;
4604 attrs = type_specifiers->attributes;
4605 type_specifiers->attributes = NULL_TREE;
4606 type = grokdeclarator (declarator, type_specifiers, context, 0, &attrs);
4607 if (attrs && type != error_mark_node)
4609 if (CLASS_TYPE_P (type))
4610 warning (OPT_Wattributes, "ignoring attributes applied to class type %qT "
4611 "outside of definition", type);
4612 else if (MAYBE_CLASS_TYPE_P (type))
4613 /* A template type parameter or other dependent type. */
4614 warning (OPT_Wattributes, "ignoring attributes applied to dependent "
4615 "type %qT without an associated declaration", type);
4617 cplus_decl_attributes (&type, attrs, 0);
4622 /* Process a DECLARATOR for a function-scope variable declaration,
4623 namespace-scope variable declaration, or function declaration.
4624 (Function definitions go through start_function; class member
4625 declarations appearing in the body of the class go through
4626 grokfield.) The DECL corresponding to the DECLARATOR is returned.
4627 If an error occurs, the error_mark_node is returned instead.
4629 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
4630 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
4631 for an explicitly defaulted function, or SD_DELETED for an explicitly
4632 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
4633 implicitly initialized via a default constructor. ATTRIBUTES and
4634 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
4636 The scope represented by the context of the returned DECL is pushed
4637 (if it is not the global namespace) and is assigned to
4638 *PUSHED_SCOPE_P. The caller is then responsible for calling
4639 pop_scope on *PUSHED_SCOPE_P if it is set. */
4642 start_decl (const cp_declarator *declarator,
4643 cp_decl_specifier_seq *declspecs,
4646 tree prefix_attributes,
4647 tree *pushed_scope_p)
4655 *pushed_scope_p = NULL_TREE;
4657 /* An object declared as __attribute__((deprecated)) suppresses
4658 warnings of uses of other deprecated items. */
4659 if (lookup_attribute ("deprecated", attributes))
4660 deprecated_state = DEPRECATED_SUPPRESS;
4662 attributes = chainon (attributes, prefix_attributes);
4664 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
4667 deprecated_state = DEPRECATED_NORMAL;
4669 if (decl == NULL_TREE || VOID_TYPE_P (decl)
4670 || decl == error_mark_node)
4671 return error_mark_node;
4673 context = CP_DECL_CONTEXT (decl);
4674 if (context != global_namespace)
4675 *pushed_scope_p = push_scope (context);
4677 /* Is it valid for this decl to have an initializer at all?
4678 If not, set INITIALIZED to zero, which will indirectly
4679 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4681 && TREE_CODE (decl) == TYPE_DECL)
4683 error ("typedef %qD is initialized (use decltype instead)", decl);
4684 return error_mark_node;
4689 if (! toplevel_bindings_p ()
4690 && DECL_EXTERNAL (decl))
4691 warning (0, "declaration of %q#D has %<extern%> and is initialized",
4693 DECL_EXTERNAL (decl) = 0;
4694 if (toplevel_bindings_p ())
4695 TREE_STATIC (decl) = 1;
4697 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl)) != 0;
4699 if (alias && TREE_CODE (decl) == FUNCTION_DECL)
4700 record_key_method_defined (decl);
4702 /* If this is a typedef that names the class for linkage purposes
4703 (7.1.3p8), apply any attributes directly to the type. */
4704 if (TREE_CODE (decl) == TYPE_DECL
4705 && OVERLOAD_TYPE_P (TREE_TYPE (decl))
4706 && decl == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl))))
4707 flags = ATTR_FLAG_TYPE_IN_PLACE;
4711 /* Set attributes here so if duplicate decl, will have proper attributes. */
4712 cplus_decl_attributes (&decl, attributes, flags);
4714 /* Dllimported symbols cannot be defined. Static data members (which
4715 can be initialized in-class and dllimported) go through grokfield,
4716 not here, so we don't need to exclude those decls when checking for
4718 if (initialized && DECL_DLLIMPORT_P (decl))
4720 error ("definition of %q#D is marked %<dllimport%>", decl);
4721 DECL_DLLIMPORT_P (decl) = 0;
4724 /* If #pragma weak was used, mark the decl weak now. */
4725 if (!processing_template_decl)
4726 maybe_apply_pragma_weak (decl);
4728 if (TREE_CODE (decl) == FUNCTION_DECL
4729 && DECL_DECLARED_INLINE_P (decl)
4730 && DECL_UNINLINABLE (decl)
4731 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4732 warning (0, "inline function %q+D given attribute noinline", decl);
4734 if (TYPE_P (context) && COMPLETE_TYPE_P (complete_type (context)))
4736 bool this_tmpl = (processing_template_decl
4737 > template_class_depth (context));
4740 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
4741 if (field == NULL_TREE
4742 || !(VAR_P (field) || variable_template_p (field)))
4743 error ("%q+#D is not a static data member of %q#T", decl, context);
4744 else if (variable_template_p (field) && !this_tmpl)
4746 if (DECL_LANG_SPECIFIC (decl)
4747 && DECL_TEMPLATE_SPECIALIZATION (decl))
4748 /* OK, specialization was already checked. */;
4751 error_at (DECL_SOURCE_LOCATION (decl),
4752 "non-member-template declaration of %qD", decl);
4753 inform (DECL_SOURCE_LOCATION (field), "does not match "
4754 "member template declaration here");
4755 return error_mark_node;
4760 if (variable_template_p (field))
4761 field = DECL_TEMPLATE_RESULT (field);
4763 if (DECL_CONTEXT (field) != context)
4765 if (!same_type_p (DECL_CONTEXT (field), context))
4766 permerror (input_location, "ISO C++ does not permit %<%T::%D%> "
4767 "to be defined as %<%T::%D%>",
4768 DECL_CONTEXT (field), DECL_NAME (decl),
4769 context, DECL_NAME (decl));
4770 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
4772 /* Static data member are tricky; an in-class initialization
4773 still doesn't provide a definition, so the in-class
4774 declaration will have DECL_EXTERNAL set, but will have an
4775 initialization. Thus, duplicate_decls won't warn
4776 about this situation, and so we check here. */
4777 if (initialized && DECL_INITIALIZED_IN_CLASS_P (field))
4778 error ("duplicate initialization of %qD", decl);
4779 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
4781 if (decl_spec_seq_has_spec_p (declspecs, ds_constexpr)
4782 && !DECL_DECLARED_CONSTEXPR_P (field))
4783 error ("%qD declared %<constexpr%> outside its class", field);
4788 tree field = check_classfn (context, decl,
4790 ? current_template_parms
4792 if (field && field != error_mark_node
4793 && duplicate_decls (decl, field,
4794 /*newdecl_is_friend=*/false))
4798 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
4799 DECL_IN_AGGR_P (decl) = 0;
4800 /* Do not mark DECL as an explicit specialization if it was not
4801 already marked as an instantiation; a declaration should
4802 never be marked as a specialization unless we know what
4803 template is being specialized. */
4804 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
4806 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
4807 if (TREE_CODE (decl) == FUNCTION_DECL)
4808 DECL_COMDAT (decl) = (TREE_PUBLIC (decl)
4809 && DECL_DECLARED_INLINE_P (decl));
4811 DECL_COMDAT (decl) = false;
4813 /* [temp.expl.spec] An explicit specialization of a static data
4814 member of a template is a definition if the declaration
4815 includes an initializer; otherwise, it is a declaration.
4817 We check for processing_specialization so this only applies
4818 to the new specialization syntax. */
4819 if (!initialized && processing_specialization)
4820 DECL_EXTERNAL (decl) = 1;
4823 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl)
4824 /* Aliases are definitions. */
4826 permerror (input_location, "declaration of %q#D outside of class is not definition",
4830 was_public = TREE_PUBLIC (decl);
4832 /* Enter this declaration into the symbol table. Don't push the plain
4833 VAR_DECL for a variable template. */
4834 if (!template_parm_scope_p ()
4835 || TREE_CODE (decl) != VAR_DECL)
4836 decl = maybe_push_decl (decl);
4838 if (processing_template_decl)
4839 decl = push_template_decl (decl);
4840 if (decl == error_mark_node)
4841 return error_mark_node;
4844 && DECL_NAMESPACE_SCOPE_P (decl) && !TREE_PUBLIC (decl) && !was_public
4845 && !DECL_THIS_STATIC (decl) && !DECL_ARTIFICIAL (decl))
4847 /* This is a const variable with implicit 'static'. Set
4848 DECL_THIS_STATIC so we can tell it from variables that are
4849 !TREE_PUBLIC because of the anonymous namespace. */
4850 gcc_assert (CP_TYPE_CONST_P (TREE_TYPE (decl)) || errorcount);
4851 DECL_THIS_STATIC (decl) = 1;
4854 if (current_function_decl && VAR_P (decl)
4855 && DECL_DECLARED_CONSTEXPR_P (current_function_decl))
4858 if (DECL_THREAD_LOCAL_P (decl))
4859 error ("%qD declared %<thread_local%> in %<constexpr%> function",
4861 else if (TREE_STATIC (decl))
4862 error ("%qD declared %<static%> in %<constexpr%> function", decl);
4866 cp_function_chain->invalid_constexpr = true;
4869 if (!processing_template_decl && VAR_P (decl))
4870 start_decl_1 (decl, initialized);
4875 /* Process the declaration of a variable DECL. INITIALIZED is true
4876 iff DECL is explicitly initialized. (INITIALIZED is false if the
4877 variable is initialized via an implicitly-called constructor.)
4878 This function must be called for ordinary variables (including, for
4879 example, implicit instantiations of templates), but must not be
4880 called for template declarations. */
4883 start_decl_1 (tree decl, bool initialized)
4887 bool aggregate_definition_p;
4889 gcc_assert (!processing_template_decl);
4891 if (error_operand_p (decl))
4894 gcc_assert (VAR_P (decl));
4896 type = TREE_TYPE (decl);
4897 complete_p = COMPLETE_TYPE_P (type);
4898 aggregate_definition_p = MAYBE_CLASS_TYPE_P (type) && !DECL_EXTERNAL (decl);
4900 /* If an explicit initializer is present, or if this is a definition
4901 of an aggregate, then we need a complete type at this point.
4902 (Scalars are always complete types, so there is nothing to
4903 check.) This code just sets COMPLETE_P; errors (if necessary)
4904 are issued below. */
4905 if ((initialized || aggregate_definition_p)
4907 && COMPLETE_TYPE_P (complete_type (type)))
4910 /* We will not yet have set TREE_READONLY on DECL if the type
4911 was "const", but incomplete, before this point. But, now, we
4912 have a complete type, so we can try again. */
4913 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
4917 /* Is it valid for this decl to have an initializer at all? */
4919 /* Don't allow initializations for incomplete types except for
4920 arrays which might be completed by the initialization. */
4922 ; /* A complete type is ok. */
4923 else if (type_uses_auto (type))
4924 ; /* An auto type is ok. */
4925 else if (TREE_CODE (type) != ARRAY_TYPE)
4927 error ("variable %q#D has initializer but incomplete type", decl);
4928 type = TREE_TYPE (decl) = error_mark_node;
4930 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4932 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
4933 error ("elements of array %q#D have incomplete type", decl);
4934 /* else we already gave an error in start_decl. */
4937 else if (aggregate_definition_p && !complete_p)
4939 if (type_uses_auto (type))
4940 error ("declaration of %q#D has no initializer", decl);
4942 error ("aggregate %q#D has incomplete type and cannot be defined",
4944 /* Change the type so that assemble_variable will give
4945 DECL an rtl we can live with: (mem (const_int 0)). */
4946 type = TREE_TYPE (decl) = error_mark_node;
4949 /* Create a new scope to hold this declaration if necessary.
4950 Whether or not a new scope is necessary cannot be determined
4951 until after the type has been completed; if the type is a
4952 specialization of a class template it is not until after
4953 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
4954 will be set correctly. */
4955 maybe_push_cleanup_level (type);
4958 /* Handle initialization of references. DECL, TYPE, and INIT have the
4959 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
4960 but will be set to a new CLEANUP_STMT if a temporary is created
4961 that must be destroyed subsequently.
4963 Returns an initializer expression to use to initialize DECL, or
4964 NULL if the initialization can be performed statically.
4966 Quotes on semantics can be found in ARM 8.4.3. */
4969 grok_reference_init (tree decl, tree type, tree init, int flags)
4971 if (init == NULL_TREE)
4973 if ((DECL_LANG_SPECIFIC (decl) == 0
4974 || DECL_IN_AGGR_P (decl) == 0)
4975 && ! DECL_THIS_EXTERN (decl))
4976 error ("%qD declared as reference but not initialized", decl);
4980 if (TREE_CODE (init) == TREE_LIST)
4981 init = build_x_compound_expr_from_list (init, ELK_INIT,
4982 tf_warning_or_error);
4984 tree ttype = TREE_TYPE (type);
4985 if (TREE_CODE (ttype) != ARRAY_TYPE
4986 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
4987 /* Note: default conversion is only called in very special cases. */
4988 init = decay_conversion (init, tf_warning_or_error);
4990 /* check_initializer handles this for non-reference variables, but for
4991 references we need to do it here or the initializer will get the
4992 incomplete array type and confuse later calls to
4993 cp_complete_array_type. */
4994 if (TREE_CODE (ttype) == ARRAY_TYPE
4995 && TYPE_DOMAIN (ttype) == NULL_TREE
4996 && (BRACE_ENCLOSED_INITIALIZER_P (init)
4997 || TREE_CODE (init) == STRING_CST))
4999 cp_complete_array_type (&ttype, init, false);
5000 if (ttype != TREE_TYPE (type))
5001 type = cp_build_reference_type (ttype, TYPE_REF_IS_RVALUE (type));
5004 /* Convert INIT to the reference type TYPE. This may involve the
5005 creation of a temporary, whose lifetime must be the same as that
5006 of the reference. If so, a DECL_EXPR for the temporary will be
5007 added just after the DECL_EXPR for DECL. That's why we don't set
5008 DECL_INITIAL for local references (instead assigning to them
5009 explicitly); we need to allow the temporary to be initialized
5011 return initialize_reference (type, init, flags,
5012 tf_warning_or_error);
5015 /* Designated initializers in arrays are not supported in GNU C++.
5016 The parser cannot detect this error since it does not know whether
5017 a given brace-enclosed initializer is for a class type or for an
5018 array. This function checks that CE does not use a designated
5019 initializer. If it does, an error is issued. Returns true if CE
5020 is valid, i.e., does not have a designated initializer. */
5023 check_array_designated_initializer (constructor_elt *ce,
5024 unsigned HOST_WIDE_INT index)
5026 /* Designated initializers for array elements are not supported. */
5029 /* The parser only allows identifiers as designated
5031 if (ce->index == error_mark_node)
5033 error ("name used in a GNU-style designated "
5034 "initializer for an array");
5037 else if (identifier_p (ce->index))
5039 error ("name %qD used in a GNU-style designated "
5040 "initializer for an array", ce->index);
5044 tree ce_index = build_expr_type_conversion (WANT_INT | WANT_ENUM,
5047 && INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (ce_index))
5048 && (TREE_CODE (ce_index = maybe_constant_value (ce_index))
5051 /* A C99 designator is OK if it matches the current index. */
5052 if (wi::eq_p (ce_index, index))
5055 sorry ("non-trivial designated initializers not supported");
5058 error ("C99 designator %qE is not an integral constant-expression",
5067 /* When parsing `int a[] = {1, 2};' we don't know the size of the
5068 array until we finish parsing the initializer. If that's the
5069 situation we're in, update DECL accordingly. */
5072 maybe_deduce_size_from_array_init (tree decl, tree init)
5074 tree type = TREE_TYPE (decl);
5076 if (TREE_CODE (type) == ARRAY_TYPE
5077 && TYPE_DOMAIN (type) == NULL_TREE
5078 && TREE_CODE (decl) != TYPE_DECL)
5080 /* do_default is really a C-ism to deal with tentative definitions.
5081 But let's leave it here to ease the eventual merge. */
5082 int do_default = !DECL_EXTERNAL (decl);
5083 tree initializer = init ? init : DECL_INITIAL (decl);
5086 /* Check that there are no designated initializers in INIT, as
5087 those are not supported in GNU C++, and as the middle-end
5088 will crash if presented with a non-numeric designated
5090 if (initializer && BRACE_ENCLOSED_INITIALIZER_P (initializer))
5092 vec<constructor_elt, va_gc> *v = CONSTRUCTOR_ELTS (initializer);
5093 constructor_elt *ce;
5095 FOR_EACH_VEC_SAFE_ELT (v, i, ce)
5096 if (!check_array_designated_initializer (ce, i))
5102 failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
5106 error ("initializer fails to determine size of %qD", decl);
5108 else if (failure == 2)
5112 error ("array size missing in %qD", decl);
5114 /* If a `static' var's size isn't known, make it extern as
5115 well as static, so it does not get allocated. If it's not
5116 `static', then don't mark it extern; finish_incomplete_decl
5117 will give it a default size and it will get allocated. */
5118 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
5119 DECL_EXTERNAL (decl) = 1;
5121 else if (failure == 3)
5123 error ("zero-size array %qD", decl);
5127 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
5129 relayout_decl (decl);
5133 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
5134 any appropriate error messages regarding the layout. */
5137 layout_var_decl (tree decl)
5141 type = TREE_TYPE (decl);
5142 if (type == error_mark_node)
5145 /* If we haven't already laid out this declaration, do so now.
5146 Note that we must not call complete type for an external object
5147 because it's type might involve templates that we are not
5148 supposed to instantiate yet. (And it's perfectly valid to say
5149 `extern X x' for some incomplete type `X'.) */
5150 if (!DECL_EXTERNAL (decl))
5151 complete_type (type);
5152 if (!DECL_SIZE (decl)
5153 && TREE_TYPE (decl) != error_mark_node
5154 && (COMPLETE_TYPE_P (type)
5155 || (TREE_CODE (type) == ARRAY_TYPE
5156 && !TYPE_DOMAIN (type)
5157 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
5158 layout_decl (decl, 0);
5160 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
5162 /* An automatic variable with an incomplete type: that is an error.
5163 Don't talk about array types here, since we took care of that
5164 message in grokdeclarator. */
5165 error ("storage size of %qD isn%'t known", decl);
5166 TREE_TYPE (decl) = error_mark_node;
5169 /* Keep this code around in case we later want to control debug info
5170 based on whether a type is "used". (jason 1999-11-11) */
5172 else if (!DECL_EXTERNAL (decl) && MAYBE_CLASS_TYPE_P (ttype))
5173 /* Let debugger know it should output info for this type. */
5174 note_debug_info_needed (ttype);
5176 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
5177 note_debug_info_needed (DECL_CONTEXT (decl));
5180 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
5181 && DECL_SIZE (decl) != NULL_TREE
5182 && ! TREE_CONSTANT (DECL_SIZE (decl)))
5184 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
5185 constant_expression_warning (DECL_SIZE (decl));
5188 error ("storage size of %qD isn%'t constant", decl);
5189 TREE_TYPE (decl) = error_mark_node;
5194 /* If a local static variable is declared in an inline function, or if
5195 we have a weak definition, we must endeavor to create only one
5196 instance of the variable at link-time. */
5199 maybe_commonize_var (tree decl)
5201 /* Static data in a function with comdat linkage also has comdat
5203 if (TREE_STATIC (decl)
5204 /* Don't mess with __FUNCTION__. */
5205 && ! DECL_ARTIFICIAL (decl)
5206 && DECL_FUNCTION_SCOPE_P (decl)
5207 && vague_linkage_p (DECL_CONTEXT (decl)))
5211 /* With weak symbols, we simply make the variable COMDAT;
5212 that will cause copies in multiple translations units to
5214 comdat_linkage (decl);
5218 if (DECL_INITIAL (decl) == NULL_TREE
5219 || DECL_INITIAL (decl) == error_mark_node)
5221 /* Without weak symbols, we can use COMMON to merge
5222 uninitialized variables. */
5223 TREE_PUBLIC (decl) = 1;
5224 DECL_COMMON (decl) = 1;
5228 /* While for initialized variables, we must use internal
5229 linkage -- which means that multiple copies will not
5231 TREE_PUBLIC (decl) = 0;
5232 DECL_COMMON (decl) = 0;
5233 if (warning_at (DECL_SOURCE_LOCATION (decl), 0,
5234 "sorry: semantics of inline function static "
5235 "data %q#D are wrong (you%'ll wind up "
5236 "with multiple copies)", decl))
5237 inform (DECL_SOURCE_LOCATION (decl),
5238 "you can work around this by removing the initializer");
5244 /* Issue an error message if DECL is an uninitialized const variable. */
5247 check_for_uninitialized_const_var (tree decl)
5249 tree type = strip_array_types (TREE_TYPE (decl));
5251 /* ``Unless explicitly declared extern, a const object does not have
5252 external linkage and must be initialized. ($8.4; $12.1)'' ARM
5255 && TREE_CODE (type) != REFERENCE_TYPE
5256 && (CP_TYPE_CONST_P (type) || var_in_constexpr_fn (decl))
5257 && !DECL_INITIAL (decl))
5259 tree field = default_init_uninitialized_part (type);
5263 if (CP_TYPE_CONST_P (type))
5264 permerror (DECL_SOURCE_LOCATION (decl),
5265 "uninitialized const %qD", decl);
5268 error_at (DECL_SOURCE_LOCATION (decl),
5269 "uninitialized variable %qD in %<constexpr%> function",
5271 cp_function_chain->invalid_constexpr = true;
5274 if (CLASS_TYPE_P (type))
5276 tree defaulted_ctor;
5278 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (type)),
5279 "%q#T has no user-provided default constructor", type);
5280 defaulted_ctor = in_class_defaulted_default_constructor (type);
5282 inform (DECL_SOURCE_LOCATION (defaulted_ctor),
5283 "constructor is not user-provided because it is "
5284 "explicitly defaulted in the class body");
5285 inform (0, "and the implicitly-defined constructor does not "
5286 "initialize %q+#D", field);
5291 /* Structure holding the current initializer being processed by reshape_init.
5292 CUR is a pointer to the current element being processed, END is a pointer
5293 after the last element present in the initializer. */
5294 typedef struct reshape_iterator_t
5296 constructor_elt *cur;
5297 constructor_elt *end;
5300 static tree reshape_init_r (tree, reshape_iter *, bool, tsubst_flags_t);
5302 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
5303 returned is the next FIELD_DECL (possibly FIELD itself) that can be
5304 initialized. If there are no more such fields, the return value
5308 next_initializable_field (tree field)
5311 && (TREE_CODE (field) != FIELD_DECL
5312 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
5313 || DECL_ARTIFICIAL (field)))
5314 field = DECL_CHAIN (field);
5319 /* Subroutine of reshape_init_array and reshape_init_vector, which does
5320 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
5321 INTEGER_CST representing the size of the array minus one (the maximum index),
5322 or NULL_TREE if the array was declared without specifying the size. D is
5323 the iterator within the constructor. */
5326 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d,
5327 tsubst_flags_t complain)
5330 bool sized_array_p = (max_index && TREE_CONSTANT (max_index));
5331 unsigned HOST_WIDE_INT max_index_cst = 0;
5332 unsigned HOST_WIDE_INT index;
5334 /* The initializer for an array is always a CONSTRUCTOR. */
5335 new_init = build_constructor (init_list_type_node, NULL);
5339 /* Minus 1 is used for zero sized arrays. */
5340 if (integer_all_onesp (max_index))
5343 if (tree_fits_uhwi_p (max_index))
5344 max_index_cst = tree_to_uhwi (max_index);
5345 /* sizetype is sign extended, not zero extended. */
5347 max_index_cst = tree_to_uhwi (fold_convert (size_type_node, max_index));
5350 /* Loop until there are no more initializers. */
5352 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
5356 constructor_elt *old_cur = d->cur;
5358 check_array_designated_initializer (d->cur, index);
5359 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false,
5361 if (elt_init == error_mark_node)
5362 return error_mark_node;
5363 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init),
5364 size_int (index), elt_init);
5365 if (!TREE_CONSTANT (elt_init))
5366 TREE_CONSTANT (new_init) = false;
5368 /* This can happen with an invalid initializer (c++/54501). */
5369 if (d->cur == old_cur && !sized_array_p)
5376 /* Subroutine of reshape_init_r, processes the initializers for arrays.
5377 Parameters are the same of reshape_init_r. */
5380 reshape_init_array (tree type, reshape_iter *d, tsubst_flags_t complain)
5382 tree max_index = NULL_TREE;
5384 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
5386 if (TYPE_DOMAIN (type))
5387 max_index = array_type_nelts (type);
5389 return reshape_init_array_1 (TREE_TYPE (type), max_index, d, complain);
5392 /* Subroutine of reshape_init_r, processes the initializers for vectors.
5393 Parameters are the same of reshape_init_r. */
5396 reshape_init_vector (tree type, reshape_iter *d, tsubst_flags_t complain)
5398 tree max_index = NULL_TREE;
5400 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
5402 if (COMPOUND_LITERAL_P (d->cur->value))
5404 tree value = d->cur->value;
5405 if (!same_type_p (TREE_TYPE (value), type))
5407 if (complain & tf_error)
5408 error ("invalid type %qT as initializer for a vector of type %qT",
5409 TREE_TYPE (d->cur->value), type);
5410 value = error_mark_node;
5416 /* For a vector, we initialize it as an array of the appropriate size. */
5417 if (TREE_CODE (type) == VECTOR_TYPE)
5418 max_index = size_int (TYPE_VECTOR_SUBPARTS (type) - 1);
5420 return reshape_init_array_1 (TREE_TYPE (type), max_index, d, complain);
5423 /* Subroutine of reshape_init_r, processes the initializers for classes
5424 or union. Parameters are the same of reshape_init_r. */
5427 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p,
5428 tsubst_flags_t complain)
5433 gcc_assert (CLASS_TYPE_P (type));
5435 /* The initializer for a class is always a CONSTRUCTOR. */
5436 new_init = build_constructor (init_list_type_node, NULL);
5437 field = next_initializable_field (TYPE_FIELDS (type));
5443 An initializer for an aggregate member that is an
5444 empty class shall have the form of an empty
5445 initializer-list {}. */
5446 if (!first_initializer_p)
5448 if (complain & tf_error)
5449 error ("initializer for %qT must be brace-enclosed", type);
5450 return error_mark_node;
5455 /* Loop through the initializable fields, gathering initializers. */
5456 while (d->cur != d->end)
5459 constructor_elt *old_cur = d->cur;
5461 /* Handle designated initializers, as an extension. */
5464 if (d->cur->index == error_mark_node)
5465 return error_mark_node;
5467 if (TREE_CODE (d->cur->index) == FIELD_DECL)
5468 /* We already reshaped this. */
5469 gcc_assert (d->cur->index == field);
5470 else if (TREE_CODE (d->cur->index) == IDENTIFIER_NODE)
5471 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
5474 if (complain & tf_error)
5475 error ("%<[%E] =%> used in a GNU-style designated initializer"
5476 " for class %qT", d->cur->index, type);
5477 return error_mark_node;
5480 if (!field || TREE_CODE (field) != FIELD_DECL)
5482 if (complain & tf_error)
5483 error ("%qT has no non-static data member named %qD", type,
5485 return error_mark_node;
5489 /* If we processed all the member of the class, we are done. */
5493 field_init = reshape_init_r (TREE_TYPE (field), d,
5494 /*first_initializer_p=*/false, complain);
5495 if (field_init == error_mark_node)
5496 return error_mark_node;
5498 if (d->cur == old_cur && d->cur->index)
5500 /* This can happen with an invalid initializer for a flexible
5501 array member (c++/54441). */
5502 if (complain & tf_error)
5503 error ("invalid initializer for %q#D", field);
5504 return error_mark_node;
5507 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
5511 When a union is initialized with a brace-enclosed
5512 initializer, the braces shall only contain an
5513 initializer for the first member of the union. */
5514 if (TREE_CODE (type) == UNION_TYPE)
5517 field = next_initializable_field (DECL_CHAIN (field));
5523 /* Subroutine of reshape_init_r. We're in a context where C99 initializer
5524 designators are not valid; either complain or return true to indicate
5525 that reshape_init_r should return error_mark_node. */
5528 has_designator_problem (reshape_iter *d, tsubst_flags_t complain)
5532 if (complain & tf_error)
5533 error ("C99 designator %qE outside aggregate initializer",
5541 /* Subroutine of reshape_init, which processes a single initializer (part of
5542 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
5543 iterator within the CONSTRUCTOR which points to the initializer to process.
5544 FIRST_INITIALIZER_P is true if this is the first initializer of the
5545 outermost CONSTRUCTOR node. */
5548 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p,
5549 tsubst_flags_t complain)
5551 tree init = d->cur->value;
5553 if (error_operand_p (init))
5554 return error_mark_node;
5556 if (first_initializer_p && !CP_AGGREGATE_TYPE_P (type)
5557 && has_designator_problem (d, complain))
5558 return error_mark_node;
5560 if (TREE_CODE (type) == COMPLEX_TYPE)
5562 /* A complex type can be initialized from one or two initializers,
5563 but braces are not elided. */
5565 if (BRACE_ENCLOSED_INITIALIZER_P (init))
5567 if (CONSTRUCTOR_NELTS (init) > 2)
5569 if (complain & tf_error)
5570 error ("too many initializers for %qT", type);
5572 return error_mark_node;
5575 else if (first_initializer_p && d->cur != d->end)
5577 vec<constructor_elt, va_gc> *v = 0;
5578 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, init);
5579 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, d->cur->value);
5580 if (has_designator_problem (d, complain))
5581 return error_mark_node;
5583 init = build_constructor (init_list_type_node, v);
5588 /* A non-aggregate type is always initialized with a single
5590 if (!CP_AGGREGATE_TYPE_P (type))
5592 /* It is invalid to initialize a non-aggregate type with a
5593 brace-enclosed initializer before C++0x.
5594 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
5595 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
5596 a CONSTRUCTOR (with a record type). */
5597 if (TREE_CODE (init) == CONSTRUCTOR
5598 /* Don't complain about a capture-init. */
5599 && !CONSTRUCTOR_IS_DIRECT_INIT (init)
5600 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
5602 if (SCALAR_TYPE_P (type))
5604 if (cxx_dialect < cxx11
5605 /* Isn't value-initialization. */
5606 || CONSTRUCTOR_NELTS (init) > 0)
5608 if (complain & tf_error)
5609 error ("braces around scalar initializer for type %qT",
5611 init = error_mark_node;
5615 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5622 /* "If T is a class type and the initializer list has a single element of
5623 type cv U, where U is T or a class derived from T, the object is
5624 initialized from that element." Even if T is an aggregate. */
5625 if (cxx_dialect >= cxx11 && (CLASS_TYPE_P (type) || VECTOR_TYPE_P (type))
5626 && first_initializer_p
5627 && d->end - d->cur == 1
5628 && reference_related_p (type, TREE_TYPE (init)))
5636 All implicit type conversions (clause _conv_) are considered when
5637 initializing the aggregate member with an initializer from an
5638 initializer-list. If the initializer can initialize a member,
5639 the member is initialized. Otherwise, if the member is itself a
5640 non-empty subaggregate, brace elision is assumed and the
5641 initializer is considered for the initialization of the first
5642 member of the subaggregate. */
5643 if (TREE_CODE (init) != CONSTRUCTOR
5644 /* But don't try this for the first initializer, since that would be
5645 looking through the outermost braces; A a2 = { a1 }; is not a
5646 valid aggregate initialization. */
5647 && !first_initializer_p
5648 && (same_type_ignoring_top_level_qualifiers_p (type, TREE_TYPE (init))
5649 || can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL,
5656 /* [dcl.init.string]
5658 A char array (whether plain char, signed char, or unsigned char)
5659 can be initialized by a string-literal (optionally enclosed in
5660 braces); a wchar_t array can be initialized by a wide
5661 string-literal (optionally enclosed in braces). */
5662 if (TREE_CODE (type) == ARRAY_TYPE
5663 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
5665 tree str_init = init;
5667 /* Strip one level of braces if and only if they enclose a single
5668 element (as allowed by [dcl.init.string]). */
5669 if (!first_initializer_p
5670 && TREE_CODE (str_init) == CONSTRUCTOR
5671 && vec_safe_length (CONSTRUCTOR_ELTS (str_init)) == 1)
5673 str_init = (*CONSTRUCTOR_ELTS (str_init))[0].value;
5676 /* If it's a string literal, then it's the initializer for the array
5677 as a whole. Otherwise, continue with normal initialization for
5678 array types (one value per array element). */
5679 if (TREE_CODE (str_init) == STRING_CST)
5681 if (has_designator_problem (d, complain))
5682 return error_mark_node;
5688 /* The following cases are about aggregates. If we are not within a full
5689 initializer already, and there is not a CONSTRUCTOR, it means that there
5690 is a missing set of braces (that is, we are processing the case for
5691 which reshape_init exists). */
5692 if (!first_initializer_p)
5694 if (TREE_CODE (init) == CONSTRUCTOR)
5696 if (TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init)))
5697 /* There is no need to reshape pointer-to-member function
5698 initializers, as they are always constructed correctly
5699 by the front end. */
5701 else if (COMPOUND_LITERAL_P (init))
5702 /* For a nested compound literal, there is no need to reshape since
5703 brace elision is not allowed. Even if we decided to allow it,
5704 we should add a call to reshape_init in finish_compound_literal,
5705 before calling digest_init, so changing this code would still
5706 not be necessary. */
5707 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
5711 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5712 return reshape_init (type, init, complain);
5716 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
5720 /* Dispatch to specialized routines. */
5721 if (CLASS_TYPE_P (type))
5722 return reshape_init_class (type, d, first_initializer_p, complain);
5723 else if (TREE_CODE (type) == ARRAY_TYPE)
5724 return reshape_init_array (type, d, complain);
5725 else if (TREE_CODE (type) == VECTOR_TYPE)
5726 return reshape_init_vector (type, d, complain);
5731 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
5732 brace-enclosed aggregate initializer.
5734 INIT is the CONSTRUCTOR containing the list of initializers describing
5735 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
5736 It may not presently match the shape of the TYPE; for example:
5738 struct S { int a; int b; };
5739 struct S a[] = { 1, 2, 3, 4 };
5741 Here INIT will hold a vector of four elements, rather than a
5742 vector of two elements, each itself a vector of two elements. This
5743 routine transforms INIT from the former form into the latter. The
5744 revised CONSTRUCTOR node is returned. */
5747 reshape_init (tree type, tree init, tsubst_flags_t complain)
5749 vec<constructor_elt, va_gc> *v;
5753 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5755 v = CONSTRUCTOR_ELTS (init);
5757 /* An empty constructor does not need reshaping, and it is always a valid
5759 if (vec_safe_is_empty (v))
5762 /* Recurse on this CONSTRUCTOR. */
5764 d.end = d.cur + v->length ();
5766 new_init = reshape_init_r (type, &d, true, complain);
5767 if (new_init == error_mark_node)
5768 return error_mark_node;
5770 /* Make sure all the element of the constructor were used. Otherwise,
5771 issue an error about exceeding initializers. */
5774 if (complain & tf_error)
5775 error ("too many initializers for %qT", type);
5777 return error_mark_node;
5783 /* Verify array initializer. Returns true if errors have been reported. */
5786 check_array_initializer (tree decl, tree type, tree init)
5788 tree element_type = TREE_TYPE (type);
5790 /* The array type itself need not be complete, because the
5791 initializer may tell us how many elements are in the array.
5792 But, the elements of the array must be complete. */
5793 if (!COMPLETE_TYPE_P (complete_type (element_type)))
5796 error ("elements of array %q#D have incomplete type", decl);
5798 error ("elements of array %q#T have incomplete type", type);
5801 /* A compound literal can't have variable size. */
5803 && ((COMPLETE_TYPE_P (type) && !TREE_CONSTANT (TYPE_SIZE (type)))
5804 || !TREE_CONSTANT (TYPE_SIZE (element_type))))
5806 error ("variable-sized compound literal");
5812 /* Subroutine of check_initializer; args are passed down from that function.
5813 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
5816 build_aggr_init_full_exprs (tree decl, tree init, int flags)
5819 gcc_assert (stmts_are_full_exprs_p ());
5820 return build_aggr_init (decl, init, flags, tf_warning_or_error);
5823 /* Verify INIT (the initializer for DECL), and record the
5824 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
5825 grok_reference_init.
5827 If the return value is non-NULL, it is an expression that must be
5828 evaluated dynamically to initialize DECL. */
5831 check_initializer (tree decl, tree init, int flags, vec<tree, va_gc> **cleanups)
5833 tree type = TREE_TYPE (decl);
5834 tree init_code = NULL;
5837 /* Things that are going to be initialized need to have complete
5839 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
5841 if (DECL_HAS_VALUE_EXPR_P (decl))
5843 /* A variable with DECL_HAS_VALUE_EXPR_P set is just a placeholder,
5844 it doesn't have storage to be initialized. */
5845 gcc_assert (init == NULL_TREE);
5849 if (type == error_mark_node)
5850 /* We will have already complained. */
5853 if (TREE_CODE (type) == ARRAY_TYPE)
5855 if (check_array_initializer (decl, type, init))
5858 else if (!COMPLETE_TYPE_P (type))
5860 error ("%q#D has incomplete type", decl);
5861 TREE_TYPE (decl) = error_mark_node;
5865 /* There is no way to make a variable-sized class type in GNU C++. */
5866 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
5868 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5870 int init_len = vec_safe_length (CONSTRUCTOR_ELTS (init));
5871 if (SCALAR_TYPE_P (type))
5875 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5876 init = build_zero_init (type, NULL_TREE, false);
5878 else if (init_len != 1 && TREE_CODE (type) != COMPLEX_TYPE)
5880 error ("scalar object %qD requires one element in initializer",
5882 TREE_TYPE (decl) = error_mark_node;
5888 if (TREE_CODE (decl) == CONST_DECL)
5890 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
5892 DECL_INITIAL (decl) = init;
5894 gcc_assert (init != NULL_TREE);
5897 else if (!init && DECL_REALLY_EXTERN (decl))
5899 else if (init || type_build_ctor_call (type)
5900 || TREE_CODE (type) == REFERENCE_TYPE)
5902 if (TREE_CODE (type) == REFERENCE_TYPE)
5904 init = grok_reference_init (decl, type, init, flags);
5905 flags |= LOOKUP_ALREADY_DIGESTED;
5908 check_for_uninitialized_const_var (decl);
5909 /* Do not reshape constructors of vectors (they don't need to be
5911 else if (BRACE_ENCLOSED_INITIALIZER_P (init))
5913 if (is_std_init_list (type))
5915 init = perform_implicit_conversion (type, init,
5916 tf_warning_or_error);
5917 flags |= LOOKUP_ALREADY_DIGESTED;
5919 else if (TYPE_NON_AGGREGATE_CLASS (type))
5921 /* Don't reshape if the class has constructors. */
5922 if (cxx_dialect == cxx98)
5923 error ("in C++98 %qD must be initialized by constructor, "
5927 else if (TREE_CODE (type) == VECTOR_TYPE && TYPE_VECTOR_OPAQUE (type))
5929 error ("opaque vector types cannot be initialized");
5930 init = error_mark_node;
5934 init = reshape_init (type, init, tf_warning_or_error);
5935 flags |= LOOKUP_NO_NARROWING;
5938 else if (TREE_CODE (init) == TREE_LIST
5939 && TREE_TYPE (init) != unknown_type_node
5940 && !MAYBE_CLASS_TYPE_P (type))
5942 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
5944 /* We get here with code like `int a (2);' */
5945 init = build_x_compound_expr_from_list (init, ELK_INIT,
5946 tf_warning_or_error);
5949 /* If DECL has an array type without a specific bound, deduce the
5950 array size from the initializer. */
5951 maybe_deduce_size_from_array_init (decl, init);
5952 type = TREE_TYPE (decl);
5953 if (type == error_mark_node)
5956 if ((type_build_ctor_call (type) || CLASS_TYPE_P (type))
5957 && !(flags & LOOKUP_ALREADY_DIGESTED)
5958 && !(init && BRACE_ENCLOSED_INITIALIZER_P (init)
5959 && CP_AGGREGATE_TYPE_P (type)
5960 && (CLASS_TYPE_P (type)
5961 || !TYPE_NEEDS_CONSTRUCTING (type)
5962 || type_has_extended_temps (type))))
5964 init_code = build_aggr_init_full_exprs (decl, init, flags);
5966 /* A constructor call is a non-trivial initializer even if
5967 it isn't explicitly written. */
5968 if (TREE_SIDE_EFFECTS (init_code))
5969 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = true;
5971 /* If this is a constexpr initializer, expand_default_init will
5972 have returned an INIT_EXPR rather than a CALL_EXPR. In that
5973 case, pull the initializer back out and pass it down into
5974 store_init_value. */
5975 while (TREE_CODE (init_code) == EXPR_STMT
5976 || TREE_CODE (init_code) == CONVERT_EXPR)
5977 init_code = TREE_OPERAND (init_code, 0);
5978 if (TREE_CODE (init_code) == INIT_EXPR)
5980 init = TREE_OPERAND (init_code, 1);
5981 init_code = NULL_TREE;
5982 /* Don't call digest_init; it's unnecessary and will complain
5983 about aggregate initialization of non-aggregate classes. */
5984 flags |= LOOKUP_ALREADY_DIGESTED;
5986 else if (DECL_DECLARED_CONSTEXPR_P (decl))
5988 /* Declared constexpr, but no suitable initializer; massage
5989 init appropriately so we can pass it into store_init_value
5991 if (CLASS_TYPE_P (type)
5992 && (!init || TREE_CODE (init) == TREE_LIST))
5994 init = build_functional_cast (type, init, tf_none);
5995 if (TREE_CODE (init) == TARGET_EXPR)
5996 TARGET_EXPR_DIRECT_INIT_P (init) = true;
5998 init_code = NULL_TREE;
6004 if (init && TREE_CODE (init) != TREE_VEC)
6006 /* In aggregate initialization of a variable, each element
6007 initialization is a full-expression because there is no
6008 enclosing expression. */
6009 gcc_assert (stmts_are_full_exprs_p ());
6011 init_code = store_init_value (decl, init, cleanups, flags);
6013 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
6014 && DECL_INITIAL (decl)
6015 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
6016 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
6017 warning (0, "array %qD initialized by parenthesized string literal %qE",
6018 decl, DECL_INITIAL (decl));
6024 if (CLASS_TYPE_P (core_type = strip_array_types (type))
6025 && (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type)
6026 || CLASSTYPE_REF_FIELDS_NEED_INIT (core_type)))
6027 diagnose_uninitialized_cst_or_ref_member (core_type, /*using_new=*/false,
6030 check_for_uninitialized_const_var (decl);
6033 if (init && init != error_mark_node)
6034 init_code = build2 (INIT_EXPR, type, decl, init);
6038 /* We might have set these in cp_finish_decl. */
6039 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = false;
6040 TREE_CONSTANT (decl) = false;
6043 if (init_code && DECL_IN_AGGR_P (decl))
6045 static int explained = 0;
6047 if (cxx_dialect < cxx11)
6048 error ("initializer invalid for static member with constructor");
6050 error ("non-constant in-class initialization invalid for static "
6051 "member %qD", decl);
6054 inform (input_location,
6055 "(an out of class initialization is required)");
6064 /* If DECL is not a local variable, give it RTL. */
6067 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
6069 int toplev = toplevel_bindings_p ();
6072 /* Set the DECL_ASSEMBLER_NAME for the object. */
6075 /* The `register' keyword, when used together with an
6076 asm-specification, indicates that the variable should be
6077 placed in a particular register. */
6078 if (VAR_P (decl) && DECL_REGISTER (decl))
6080 set_user_assembler_name (decl, asmspec);
6081 DECL_HARD_REGISTER (decl) = 1;
6085 if (TREE_CODE (decl) == FUNCTION_DECL
6086 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
6087 set_builtin_user_assembler_name (decl, asmspec);
6088 set_user_assembler_name (decl, asmspec);
6092 /* Handle non-variables up front. */
6095 rest_of_decl_compilation (decl, toplev, at_eof);
6099 /* If we see a class member here, it should be a static data
6101 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
6103 gcc_assert (TREE_STATIC (decl));
6104 /* An in-class declaration of a static data member should be
6105 external; it is only a declaration, and not a definition. */
6106 if (init == NULL_TREE)
6107 gcc_assert (DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl));
6110 /* We don't create any RTL for local variables. */
6111 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
6114 /* We defer emission of local statics until the corresponding
6115 DECL_EXPR is expanded. */
6116 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
6118 /* Defer template instantiations. */
6119 if (DECL_LANG_SPECIFIC (decl)
6120 && DECL_IMPLICIT_INSTANTIATION (decl))
6123 /* If we're not deferring, go ahead and assemble the variable. */
6125 rest_of_decl_compilation (decl, toplev, at_eof);
6128 /* walk_tree helper for wrap_temporary_cleanups, below. */
6131 wrap_cleanups_r (tree *stmt_p, int *walk_subtrees, void *data)
6133 /* Stop at types or full-expression boundaries. */
6134 if (TYPE_P (*stmt_p)
6135 || TREE_CODE (*stmt_p) == CLEANUP_POINT_EXPR)
6141 if (TREE_CODE (*stmt_p) == TARGET_EXPR)
6143 tree guard = (tree)data;
6144 tree tcleanup = TARGET_EXPR_CLEANUP (*stmt_p);
6146 tcleanup = build2 (TRY_CATCH_EXPR, void_type_node, tcleanup, guard);
6147 /* Tell honor_protect_cleanup_actions to handle this as a separate
6149 TRY_CATCH_IS_CLEANUP (tcleanup) = 1;
6151 TARGET_EXPR_CLEANUP (*stmt_p) = tcleanup;
6157 /* We're initializing a local variable which has a cleanup GUARD. If there
6158 are any temporaries used in the initializer INIT of this variable, we
6159 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
6160 variable will be cleaned up properly if one of them throws.
6162 Unfortunately, there's no way to express this properly in terms of
6163 nesting, as the regions for the temporaries overlap the region for the
6164 variable itself; if there are two temporaries, the variable needs to be
6165 the first thing destroyed if either of them throws. However, we only
6166 want to run the variable's cleanup if it actually got constructed. So
6167 we need to guard the temporary cleanups with the variable's cleanup if
6168 they are run on the normal path, but not if they are run on the
6169 exceptional path. We implement this by telling
6170 honor_protect_cleanup_actions to strip the variable cleanup from the
6171 exceptional path. */
6174 wrap_temporary_cleanups (tree init, tree guard)
6176 cp_walk_tree_without_duplicates (&init, wrap_cleanups_r, (void *)guard);
6179 /* Generate code to initialize DECL (a local variable). */
6182 initialize_local_var (tree decl, tree init)
6184 tree type = TREE_TYPE (decl);
6188 gcc_assert (VAR_P (decl)
6189 || TREE_CODE (decl) == RESULT_DECL);
6190 gcc_assert (!TREE_STATIC (decl));
6192 if (DECL_SIZE (decl) == NULL_TREE)
6194 /* If we used it already as memory, it must stay in memory. */
6195 DECL_INITIAL (decl) = NULL_TREE;
6196 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
6200 if (type == error_mark_node)
6203 /* Compute and store the initial value. */
6204 already_used = TREE_USED (decl) || TREE_USED (type);
6205 if (TREE_USED (type))
6206 DECL_READ_P (decl) = 1;
6208 /* Generate a cleanup, if necessary. */
6209 cleanup = cxx_maybe_build_cleanup (decl, tf_warning_or_error);
6211 /* Perform the initialization. */
6214 tree rinit = (TREE_CODE (init) == INIT_EXPR
6215 ? TREE_OPERAND (init, 1) : NULL_TREE);
6216 if (rinit && !TREE_SIDE_EFFECTS (rinit))
6218 /* Stick simple initializers in DECL_INITIAL so that
6219 -Wno-init-self works (c++/34772). */
6220 gcc_assert (TREE_OPERAND (init, 0) == decl);
6221 DECL_INITIAL (decl) = rinit;
6223 if (warn_init_self && TREE_CODE (type) == REFERENCE_TYPE)
6227 warning_at (DECL_SOURCE_LOCATION (decl),
6229 "reference %qD is initialized with itself", decl);
6234 int saved_stmts_are_full_exprs_p;
6236 /* If we're only initializing a single object, guard the
6237 destructors of any temporaries used in its initializer with
6238 its destructor. This isn't right for arrays because each
6239 element initialization is a full-expression. */
6240 if (cleanup && TREE_CODE (type) != ARRAY_TYPE)
6241 wrap_temporary_cleanups (init, cleanup);
6243 gcc_assert (building_stmt_list_p ());
6244 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
6245 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
6246 finish_expr_stmt (init);
6247 current_stmt_tree ()->stmts_are_full_exprs_p =
6248 saved_stmts_are_full_exprs_p;
6252 /* Set this to 0 so we can tell whether an aggregate which was
6253 initialized was ever used. Don't do this if it has a
6254 destructor, so we don't complain about the 'resource
6255 allocation is initialization' idiom. Now set
6256 attribute((unused)) on types so decls of that type will be
6257 marked used. (see TREE_USED, above.) */
6258 if (TYPE_NEEDS_CONSTRUCTING (type)
6260 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
6261 && DECL_NAME (decl))
6262 TREE_USED (decl) = 0;
6263 else if (already_used)
6264 TREE_USED (decl) = 1;
6267 finish_decl_cleanup (decl, cleanup);
6270 /* DECL is a VAR_DECL for a compiler-generated variable with static
6271 storage duration (like a virtual table) whose initializer is a
6272 compile-time constant. Initialize the variable and provide it to the
6276 initialize_artificial_var (tree decl, vec<constructor_elt, va_gc> *v)
6279 gcc_assert (DECL_ARTIFICIAL (decl));
6280 init = build_constructor (TREE_TYPE (decl), v);
6281 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
6282 DECL_INITIAL (decl) = init;
6283 DECL_INITIALIZED_P (decl) = 1;
6284 determine_visibility (decl);
6285 layout_var_decl (decl);
6286 maybe_commonize_var (decl);
6287 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
6290 /* INIT is the initializer for a variable, as represented by the
6291 parser. Returns true iff INIT is type-dependent. */
6294 type_dependent_init_p (tree init)
6296 if (TREE_CODE (init) == TREE_LIST)
6297 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
6298 return any_type_dependent_elements_p (init);
6299 else if (TREE_CODE (init) == CONSTRUCTOR)
6300 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
6302 vec<constructor_elt, va_gc> *elts;
6306 elts = CONSTRUCTOR_ELTS (init);
6307 nelts = vec_safe_length (elts);
6308 for (i = 0; i < nelts; ++i)
6309 if (type_dependent_init_p ((*elts)[i].value))
6313 /* It must be a simple expression, e.g., int i = 3; */
6314 return type_dependent_expression_p (init);
6319 /* INIT is the initializer for a variable, as represented by the
6320 parser. Returns true iff INIT is value-dependent. */
6323 value_dependent_init_p (tree init)
6325 if (TREE_CODE (init) == TREE_LIST)
6326 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
6327 return any_value_dependent_elements_p (init);
6328 else if (TREE_CODE (init) == CONSTRUCTOR)
6329 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
6331 vec<constructor_elt, va_gc> *elts;
6335 elts = CONSTRUCTOR_ELTS (init);
6336 nelts = vec_safe_length (elts);
6337 for (i = 0; i < nelts; ++i)
6338 if (value_dependent_init_p ((*elts)[i].value))
6342 /* It must be a simple expression, e.g., int i = 3; */
6343 return value_dependent_expression_p (init);
6348 /* Finish processing of a declaration;
6349 install its line number and initial value.
6350 If the length of an array type is not known before,
6351 it must be determined now, from the initial value, or it is an error.
6353 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
6354 true, then INIT is an integral constant expression.
6356 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
6357 if the (init) syntax was used. */
6360 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
6361 tree asmspec_tree, int flags)
6364 vec<tree, va_gc> *cleanups = NULL;
6365 const char *asmspec = NULL;
6366 int was_readonly = 0;
6367 bool var_definition_p = false;
6370 if (decl == error_mark_node)
6375 error ("assignment (not initialization) in declaration");
6379 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
6380 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
6381 gcc_assert (TREE_CODE (decl) != PARM_DECL);
6383 type = TREE_TYPE (decl);
6384 if (type == error_mark_node)
6387 /* If a name was specified, get the string. */
6388 if (at_namespace_scope_p ())
6389 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
6390 if (asmspec_tree && asmspec_tree != error_mark_node)
6391 asmspec = TREE_STRING_POINTER (asmspec_tree);
6393 if (current_class_type
6394 && CP_DECL_CONTEXT (decl) == current_class_type
6395 && TYPE_BEING_DEFINED (current_class_type)
6396 && !CLASSTYPE_TEMPLATE_INSTANTIATION (current_class_type)
6397 && (DECL_INITIAL (decl) || init))
6398 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
6400 if (TREE_CODE (decl) != FUNCTION_DECL
6401 && (auto_node = type_uses_auto (type)))
6404 if (init == NULL_TREE)
6406 if (DECL_LANG_SPECIFIC (decl)
6407 && DECL_TEMPLATE_INSTANTIATION (decl)
6408 && !DECL_TEMPLATE_INSTANTIATED (decl))
6410 /* init is null because we're deferring instantiating the
6411 initializer until we need it. Well, we need it now. */
6412 instantiate_decl (decl, /*defer_ok*/true, /*expl*/false);
6416 error ("declaration of %q#D has no initializer", decl);
6417 TREE_TYPE (decl) = error_mark_node;
6421 if (TREE_CODE (d_init) == TREE_LIST)
6422 d_init = build_x_compound_expr_from_list (d_init, ELK_INIT,
6423 tf_warning_or_error);
6424 d_init = resolve_nondeduced_context (d_init);
6425 type = TREE_TYPE (decl) = do_auto_deduction (type, d_init,
6427 if (type == error_mark_node)
6429 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
6432 if (!ensure_literal_type_for_constexpr_object (decl))
6433 DECL_DECLARED_CONSTEXPR_P (decl) = 0;
6436 && DECL_CLASS_SCOPE_P (decl)
6437 && DECL_INITIALIZED_IN_CLASS_P (decl))
6438 check_static_variable_definition (decl, type);
6440 if (init && TREE_CODE (decl) == FUNCTION_DECL)
6443 if (init == ridpointers[(int)RID_DELETE])
6445 /* FIXME check this is 1st decl. */
6446 DECL_DELETED_FN (decl) = 1;
6447 DECL_DECLARED_INLINE_P (decl) = 1;
6448 DECL_INITIAL (decl) = error_mark_node;
6449 FOR_EACH_CLONE (clone, decl)
6451 DECL_DELETED_FN (clone) = 1;
6452 DECL_DECLARED_INLINE_P (clone) = 1;
6453 DECL_INITIAL (clone) = error_mark_node;
6457 else if (init == ridpointers[(int)RID_DEFAULT])
6459 if (defaultable_fn_check (decl))
6460 DECL_DEFAULTED_FN (decl) = 1;
6462 DECL_INITIAL (decl) = NULL_TREE;
6466 if (init && VAR_P (decl))
6468 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
6469 /* If DECL is a reference, then we want to know whether init is a
6470 reference constant; init_const_expr_p as passed tells us whether
6471 it's an rvalue constant. */
6472 if (TREE_CODE (type) == REFERENCE_TYPE)
6473 init_const_expr_p = potential_constant_expression (init);
6474 if (init_const_expr_p)
6476 /* Set these flags now for templates. We'll update the flags in
6477 store_init_value for instantiations. */
6478 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
6479 if (decl_maybe_constant_var_p (decl))
6480 TREE_CONSTANT (decl) = 1;
6484 if (processing_template_decl)
6486 bool type_dependent_p;
6488 /* Add this declaration to the statement-tree. */
6489 if (at_function_scope_p ())
6490 add_decl_expr (decl);
6492 type_dependent_p = dependent_type_p (type);
6494 if (check_for_bare_parameter_packs (init))
6497 DECL_INITIAL (decl) = NULL_TREE;
6500 /* Generally, initializers in templates are expanded when the
6501 template is instantiated. But, if DECL is a variable constant
6502 then it can be used in future constant expressions, so its value
6503 must be available. */
6505 if (!VAR_P (decl) || dependent_type_p (type))
6506 /* We can't do anything if the decl has dependent type. */;
6508 && init_const_expr_p
6509 && !type_dependent_p
6510 && TREE_CODE (type) != REFERENCE_TYPE
6511 && decl_maybe_constant_var_p (decl)
6512 && !type_dependent_init_p (init)
6513 && !value_dependent_init_p (init))
6515 /* This variable seems to be a non-dependent constant, so process
6516 its initializer. If check_initializer returns non-null the
6517 initialization wasn't constant after all. */
6519 cleanups = make_tree_vector ();
6520 init_code = check_initializer (decl, init, flags, &cleanups);
6521 if (init_code == NULL_TREE)
6523 release_tree_vector (cleanups);
6525 else if (!DECL_PRETTY_FUNCTION_P (decl))
6527 /* Deduce array size even if the initializer is dependent. */
6528 maybe_deduce_size_from_array_init (decl, init);
6529 /* And complain about multiple initializers. */
6530 if (init && TREE_CODE (init) == TREE_LIST && TREE_CHAIN (init)
6531 && !MAYBE_CLASS_TYPE_P (type))
6532 init = build_x_compound_expr_from_list (init, ELK_INIT,
6533 tf_warning_or_error);
6537 DECL_INITIAL (decl) = init;
6541 /* Just store non-static data member initializers for later. */
6542 if (init && TREE_CODE (decl) == FIELD_DECL)
6543 DECL_INITIAL (decl) = init;
6545 /* Take care of TYPE_DECLs up front. */
6546 if (TREE_CODE (decl) == TYPE_DECL)
6548 if (type != error_mark_node
6549 && MAYBE_CLASS_TYPE_P (type) && DECL_NAME (decl))
6551 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
6552 warning (0, "shadowing previous type declaration of %q#D", decl);
6553 set_identifier_type_value (DECL_NAME (decl), decl);
6556 /* If we have installed this as the canonical typedef for this
6557 type, and that type has not been defined yet, delay emitting
6558 the debug information for it, as we will emit it later. */
6559 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
6560 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
6561 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
6563 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl),
6568 /* A reference will be modified here, as it is initialized. */
6569 if (! DECL_EXTERNAL (decl)
6570 && TREE_READONLY (decl)
6571 && TREE_CODE (type) == REFERENCE_TYPE)
6574 TREE_READONLY (decl) = 0;
6579 /* If this is a local variable that will need a mangled name,
6580 register it now. We must do this before processing the
6581 initializer for the variable, since the initialization might
6582 require a guard variable, and since the mangled name of the
6583 guard variable will depend on the mangled name of this
6585 if (DECL_FUNCTION_SCOPE_P (decl)
6586 && TREE_STATIC (decl)
6587 && !DECL_ARTIFICIAL (decl))
6589 push_local_name (decl);
6590 if (DECL_CONSTRUCTOR_P (current_function_decl)
6591 || DECL_DESTRUCTOR_P (current_function_decl))
6592 /* Normally local_decls is populated during GIMPLE lowering,
6593 but [cd]tors are never actually compiled directly. We need
6594 to put statics on the list so we can deal with the label
6595 address extension. FIXME. */
6596 add_local_decl (cfun, decl);
6599 /* Convert the initializer to the type of DECL, if we have not
6600 already initialized DECL. */
6601 if (!DECL_INITIALIZED_P (decl)
6602 /* If !DECL_EXTERNAL then DECL is being defined. In the
6603 case of a static data member initialized inside the
6604 class-specifier, there can be an initializer even if DECL
6605 is *not* defined. */
6606 && (!DECL_EXTERNAL (decl) || init))
6608 if (TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6611 = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
6612 /* Allow libjava/prims.cc define primitive classes. */
6613 if (init != NULL_TREE
6614 || jclass == NULL_TREE
6615 || TREE_CODE (jclass) != TYPE_DECL
6616 || !POINTER_TYPE_P (TREE_TYPE (jclass))
6617 || !same_type_ignoring_top_level_qualifiers_p
6618 (type, TREE_TYPE (TREE_TYPE (jclass))))
6619 error ("Java object %qD not allocated with %<new%>", decl);
6622 cleanups = make_tree_vector ();
6623 init = check_initializer (decl, init, flags, &cleanups);
6629 The memory occupied by any object of static storage
6630 duration is zero-initialized at program startup before
6631 any other initialization takes place.
6633 We cannot create an appropriate initializer until after
6634 the type of DECL is finalized. If DECL_INITIAL is set,
6635 then the DECL is statically initialized, and any
6636 necessary zero-initialization has already been performed. */
6637 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
6638 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
6639 /*nelts=*/NULL_TREE,
6640 /*static_storage_p=*/true);
6641 /* Remember that the initialization for this variable has
6643 DECL_INITIALIZED_P (decl) = 1;
6644 /* This declaration is the definition of this variable,
6645 unless we are initializing a static data member within
6646 the class specifier. */
6647 if (!DECL_EXTERNAL (decl))
6648 var_definition_p = true;
6650 /* If the variable has an array type, lay out the type, even if
6651 there is no initializer. It is valid to index through the
6652 array, and we must get TYPE_ALIGN set correctly on the array
6654 else if (TREE_CODE (type) == ARRAY_TYPE)
6657 if (TREE_STATIC (decl)
6658 && !at_function_scope_p ()
6659 && current_function_decl == NULL)
6660 /* So decl is a global variable or a static member of a
6661 non local class. Record the types it uses
6662 so that we can decide later to emit debug info for them. */
6663 record_types_used_by_current_var_decl (decl);
6665 else if (TREE_CODE (decl) == FIELD_DECL
6666 && TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6667 error ("non-static data member %qD has Java class type", decl);
6669 /* Add this declaration to the statement-tree. This needs to happen
6670 after the call to check_initializer so that the DECL_EXPR for a
6671 reference temp is added before the DECL_EXPR for the reference itself. */
6672 if (DECL_FUNCTION_SCOPE_P (decl))
6674 /* If we're building a variable sized type, and we might be
6675 reachable other than via the top of the current binding
6676 level, then create a new BIND_EXPR so that we deallocate
6677 the object at the right time. */
6680 && !TREE_CONSTANT (DECL_SIZE (decl))
6681 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list))
6684 bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL);
6685 TREE_SIDE_EFFECTS (bind) = 1;
6687 BIND_EXPR_BODY (bind) = push_stmt_list ();
6689 add_decl_expr (decl);
6692 /* Let the middle end know about variables and functions -- but not
6693 static data members in uninstantiated class templates. */
6694 if (VAR_OR_FUNCTION_DECL_P (decl))
6698 layout_var_decl (decl);
6699 maybe_commonize_var (decl);
6702 /* This needs to happen after the linkage is set. */
6703 determine_visibility (decl);
6705 if (var_definition_p && TREE_STATIC (decl))
6707 /* If a TREE_READONLY variable needs initialization
6708 at runtime, it is no longer readonly and we need to
6709 avoid MEM_READONLY_P being set on RTL created for it. */
6712 if (TREE_READONLY (decl))
6713 TREE_READONLY (decl) = 0;
6716 else if (was_readonly)
6717 TREE_READONLY (decl) = 1;
6719 /* Likewise if it needs destruction. */
6720 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
6721 TREE_READONLY (decl) = 0;
6724 make_rtl_for_nonlocal_decl (decl, init, asmspec);
6726 /* Check for abstractness of the type. Notice that there is no
6727 need to strip array types here since the check for those types
6728 is already done within create_array_type_for_decl. */
6729 abstract_virtuals_error (decl, type);
6731 if (TREE_TYPE (decl) == error_mark_node)
6732 /* No initialization required. */
6734 else if (TREE_CODE (decl) == FUNCTION_DECL)
6738 if (init == ridpointers[(int)RID_DEFAULT])
6740 /* An out-of-class default definition is defined at
6741 the point where it is explicitly defaulted. */
6742 if (DECL_DELETED_FN (decl))
6743 maybe_explain_implicit_delete (decl);
6744 else if (DECL_INITIAL (decl) == error_mark_node)
6745 synthesize_method (decl);
6748 error ("function %q#D is initialized like a variable", decl);
6750 /* else no initialization required. */
6752 else if (DECL_EXTERNAL (decl)
6753 && ! (DECL_LANG_SPECIFIC (decl)
6754 && DECL_NOT_REALLY_EXTERN (decl)))
6757 DECL_INITIAL (decl) = init;
6759 /* A variable definition. */
6760 else if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
6761 /* Initialize the local variable. */
6762 initialize_local_var (decl, init);
6764 /* If a variable is defined, and then a subsequent
6765 definition with external linkage is encountered, we will
6766 get here twice for the same variable. We want to avoid
6767 calling expand_static_init more than once. For variables
6768 that are not static data members, we can call
6769 expand_static_init only when we actually process the
6770 initializer. It is not legal to redeclare a static data
6771 member, so this issue does not arise in that case. */
6772 else if (var_definition_p && TREE_STATIC (decl))
6773 expand_static_init (decl, init);
6776 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
6777 reference, insert it in the statement-tree now. */
6781 FOR_EACH_VEC_ELT (*cleanups, i, t)
6782 push_cleanup (decl, t, false);
6783 release_tree_vector (cleanups);
6787 TREE_READONLY (decl) = 1;
6789 invoke_plugin_callbacks (PLUGIN_FINISH_DECL, decl);
6792 /* Returns a declaration for a VAR_DECL as if:
6794 extern "C" TYPE NAME;
6796 had been seen. Used to create compiler-generated global
6800 declare_global_var (tree name, tree type)
6804 push_to_top_level ();
6805 decl = build_decl (input_location, VAR_DECL, name, type);
6806 TREE_PUBLIC (decl) = 1;
6807 DECL_EXTERNAL (decl) = 1;
6808 DECL_ARTIFICIAL (decl) = 1;
6809 /* If the user has explicitly declared this variable (perhaps
6810 because the code we are compiling is part of a low-level runtime
6811 library), then it is possible that our declaration will be merged
6812 with theirs by pushdecl. */
6813 decl = pushdecl (decl);
6814 cp_finish_decl (decl, NULL_TREE, false, NULL_TREE, 0);
6815 pop_from_top_level ();
6820 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
6821 if "__cxa_atexit" is not being used) corresponding to the function
6822 to be called when the program exits. */
6825 get_atexit_fn_ptr_type (void)
6829 if (!atexit_fn_ptr_type_node)
6832 if (flag_use_cxa_atexit
6833 && !targetm.cxx.use_atexit_for_cxa_atexit ())
6834 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
6835 arg_type = ptr_type_node;
6837 /* The parameter to "atexit" is "void (*)(void)". */
6838 arg_type = NULL_TREE;
6840 fn_type = build_function_type_list (void_type_node,
6841 arg_type, NULL_TREE);
6842 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
6845 return atexit_fn_ptr_type_node;
6848 /* Returns a pointer to the `atexit' function. Note that if
6849 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
6850 `__cxa_atexit' function specified in the IA64 C++ ABI. */
6853 get_atexit_node (void)
6859 bool use_aeabi_atexit;
6864 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6866 /* The declaration for `__cxa_atexit' is:
6868 int __cxa_atexit (void (*)(void *), void *, void *)
6870 We build up the argument types and then the function type
6872 tree argtype0, argtype1, argtype2;
6874 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
6875 /* First, build the pointer-to-function type for the first
6877 fn_ptr_type = get_atexit_fn_ptr_type ();
6878 /* Then, build the rest of the argument types. */
6879 argtype2 = ptr_type_node;
6880 if (use_aeabi_atexit)
6882 argtype1 = fn_ptr_type;
6883 argtype0 = ptr_type_node;
6887 argtype1 = ptr_type_node;
6888 argtype0 = fn_ptr_type;
6890 /* And the final __cxa_atexit type. */
6891 fn_type = build_function_type_list (integer_type_node,
6892 argtype0, argtype1, argtype2,
6894 if (use_aeabi_atexit)
6895 name = "__aeabi_atexit";
6897 name = "__cxa_atexit";
6901 /* The declaration for `atexit' is:
6903 int atexit (void (*)());
6905 We build up the argument types and then the function type
6907 fn_ptr_type = get_atexit_fn_ptr_type ();
6908 /* Build the final atexit type. */
6909 fn_type = build_function_type_list (integer_type_node,
6910 fn_ptr_type, NULL_TREE);
6914 /* Now, build the function declaration. */
6915 push_lang_context (lang_name_c);
6916 atexit_fndecl = build_library_fn_ptr (name, fn_type, ECF_LEAF | ECF_NOTHROW);
6917 mark_used (atexit_fndecl);
6918 pop_lang_context ();
6919 atexit_node = decay_conversion (atexit_fndecl, tf_warning_or_error);
6924 /* Like get_atexit_node, but for thread-local cleanups. */
6927 get_thread_atexit_node (void)
6929 /* The declaration for `__cxa_thread_atexit' is:
6931 int __cxa_thread_atexit (void (*)(void *), void *, void *) */
6932 tree fn_type = build_function_type_list (integer_type_node,
6933 get_atexit_fn_ptr_type (),
6934 ptr_type_node, ptr_type_node,
6937 /* Now, build the function declaration. */
6938 tree atexit_fndecl = build_library_fn_ptr ("__cxa_thread_atexit", fn_type,
6939 ECF_LEAF | ECF_NOTHROW);
6940 return decay_conversion (atexit_fndecl, tf_warning_or_error);
6943 /* Returns the __dso_handle VAR_DECL. */
6946 get_dso_handle_node (void)
6948 if (dso_handle_node)
6949 return dso_handle_node;
6951 /* Declare the variable. */
6952 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
6955 #ifdef HAVE_GAS_HIDDEN
6956 if (dso_handle_node != error_mark_node)
6958 DECL_VISIBILITY (dso_handle_node) = VISIBILITY_HIDDEN;
6959 DECL_VISIBILITY_SPECIFIED (dso_handle_node) = 1;
6963 return dso_handle_node;
6966 /* Begin a new function with internal linkage whose job will be simply
6967 to destroy some particular variable. */
6969 static GTY(()) int start_cleanup_cnt;
6972 start_cleanup_fn (void)
6977 bool use_cxa_atexit = flag_use_cxa_atexit
6978 && !targetm.cxx.use_atexit_for_cxa_atexit ();
6980 push_to_top_level ();
6982 /* No need to mangle this. */
6983 push_lang_context (lang_name_c);
6985 /* Build the name of the function. */
6986 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
6987 /* Build the function declaration. */
6988 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
6989 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
6990 /* It's a function with internal linkage, generated by the
6992 TREE_PUBLIC (fndecl) = 0;
6993 DECL_ARTIFICIAL (fndecl) = 1;
6994 /* Make the function `inline' so that it is only emitted if it is
6995 actually needed. It is unlikely that it will be inlined, since
6996 it is only called via a function pointer, but we avoid unnecessary
6997 emissions this way. */
6998 DECL_DECLARED_INLINE_P (fndecl) = 1;
6999 DECL_INTERFACE_KNOWN (fndecl) = 1;
7000 /* Build the parameter. */
7005 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
7006 DECL_CONTEXT (parmdecl) = fndecl;
7007 TREE_USED (parmdecl) = 1;
7008 DECL_READ_P (parmdecl) = 1;
7009 DECL_ARGUMENTS (fndecl) = parmdecl;
7013 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
7015 pop_lang_context ();
7017 return current_function_decl;
7020 /* Finish the cleanup function begun by start_cleanup_fn. */
7023 end_cleanup_fn (void)
7025 expand_or_defer_fn (finish_function (0));
7027 pop_from_top_level ();
7030 /* Generate code to handle the destruction of DECL, an object with
7031 static storage duration. */
7034 register_dtor_fn (tree decl)
7041 bool ob_parm, dso_parm, use_dtor;
7042 tree arg0, arg1, arg2;
7045 type = TREE_TYPE (decl);
7046 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
7049 /* If we're using "__cxa_atexit" (or "__cxa_thread_atexit" or
7050 "__aeabi_atexit"), and DECL is a class object, we can just pass the
7051 destructor to "__cxa_atexit"; we don't have to build a temporary
7052 function to do the cleanup. */
7053 dso_parm = (flag_use_cxa_atexit
7054 && !targetm.cxx.use_atexit_for_cxa_atexit ());
7055 ob_parm = (DECL_THREAD_LOCAL_P (decl) || dso_parm);
7056 use_dtor = ob_parm && CLASS_TYPE_P (type);
7061 /* Find the destructor. */
7062 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
7063 gcc_assert (idx >= 0);
7064 cleanup = (*CLASSTYPE_METHOD_VEC (type))[idx];
7065 /* Make sure it is accessible. */
7066 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup,
7067 tf_warning_or_error);
7071 /* Call build_cleanup before we enter the anonymous function so
7072 that any access checks will be done relative to the current
7073 scope, rather than the scope of the anonymous function. */
7074 build_cleanup (decl);
7076 /* Now start the function. */
7077 cleanup = start_cleanup_fn ();
7079 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
7080 to the original function, rather than the anonymous one. That
7081 will make the back end think that nested functions are in use,
7082 which causes confusion. */
7083 push_deferring_access_checks (dk_no_check);
7084 fcall = build_cleanup (decl);
7085 pop_deferring_access_checks ();
7087 /* Create the body of the anonymous function. */
7088 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
7089 finish_expr_stmt (fcall);
7090 finish_compound_stmt (compound_stmt);
7094 /* Call atexit with the cleanup function. */
7095 mark_used (cleanup);
7096 cleanup = build_address (cleanup);
7098 if (DECL_THREAD_LOCAL_P (decl))
7099 atex_node = get_thread_atexit_node ();
7101 atex_node = get_atexit_node ();
7105 /* We must convert CLEANUP to the type that "__cxa_atexit"
7107 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
7108 /* "__cxa_atexit" will pass the address of DECL to the
7109 cleanup function. */
7111 addr = build_address (decl);
7112 /* The declared type of the parameter to "__cxa_atexit" is
7113 "void *". For plain "T*", we could just let the
7114 machinery in cp_build_function_call convert it -- but if the
7115 type is "cv-qualified T *", then we need to convert it
7116 before passing it in, to avoid spurious errors. */
7117 addr = build_nop (ptr_type_node, addr);
7120 /* Since the cleanup functions we build ignore the address
7121 they're given, there's no reason to pass the actual address
7122 in, and, in general, it's cheaper to pass NULL than any
7124 addr = null_pointer_node;
7127 arg2 = cp_build_addr_expr (get_dso_handle_node (),
7128 tf_warning_or_error);
7130 /* Just pass NULL to the dso handle parm if we don't actually
7131 have a DSO handle on this target. */
7132 arg2 = null_pointer_node;
7138 if (!DECL_THREAD_LOCAL_P (decl)
7139 && targetm.cxx.use_aeabi_atexit ())
7155 return cp_build_function_call_nary (atex_node, tf_warning_or_error,
7156 arg0, arg1, arg2, NULL_TREE);
7159 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
7160 is its initializer. Generate code to handle the construction
7161 and destruction of DECL. */
7164 expand_static_init (tree decl, tree init)
7166 gcc_assert (VAR_P (decl));
7167 gcc_assert (TREE_STATIC (decl));
7169 /* Some variables require no dynamic initialization. */
7171 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
7173 /* Make sure the destructor is callable. */
7174 cxx_maybe_build_cleanup (decl, tf_warning_or_error);
7178 if (DECL_THREAD_LOCAL_P (decl) && DECL_GNU_TLS_P (decl)
7179 && !DECL_FUNCTION_SCOPE_P (decl))
7182 error ("non-local variable %qD declared %<__thread%> "
7183 "needs dynamic initialization", decl);
7185 error ("non-local variable %qD declared %<__thread%> "
7186 "has a non-trivial destructor", decl);
7187 static bool informed;
7190 inform (DECL_SOURCE_LOCATION (decl),
7191 "C++11 %<thread_local%> allows dynamic initialization "
7198 if (DECL_FUNCTION_SCOPE_P (decl))
7200 /* Emit code to perform this initialization but once. */
7201 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
7202 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
7203 tree guard, guard_addr;
7205 /* We don't need thread-safety code for thread-local vars. */
7206 bool thread_guard = (flag_threadsafe_statics
7207 && !DECL_THREAD_LOCAL_P (decl));
7209 /* Emit code to perform this initialization but once. This code
7212 static <type> guard;
7213 if (!guard.first_byte) {
7214 if (__cxa_guard_acquire (&guard)) {
7217 // Do initialization.
7218 flag = true; __cxa_guard_release (&guard);
7219 // Register variable for destruction at end of program.
7221 if (!flag) __cxa_guard_abort (&guard);
7225 Note that the `flag' variable is only set to 1 *after* the
7226 initialization is complete. This ensures that an exception,
7227 thrown during the construction, will cause the variable to
7228 reinitialized when we pass through this code again, as per:
7232 If the initialization exits by throwing an exception, the
7233 initialization is not complete, so it will be tried again
7234 the next time control enters the declaration.
7236 This process should be thread-safe, too; multiple threads
7237 should not be able to initialize the variable more than
7240 /* Create the guard variable. */
7241 guard = get_guard (decl);
7243 /* This optimization isn't safe on targets with relaxed memory
7244 consistency. On such targets we force synchronization in
7245 __cxa_guard_acquire. */
7246 if (!targetm.relaxed_ordering || !thread_guard)
7248 /* Begin the conditional initialization. */
7249 if_stmt = begin_if_stmt ();
7250 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
7251 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
7256 tree vfntype = NULL_TREE;
7257 tree acquire_name, release_name, abort_name;
7258 tree acquire_fn, release_fn, abort_fn;
7259 guard_addr = build_address (guard);
7261 acquire_name = get_identifier ("__cxa_guard_acquire");
7262 release_name = get_identifier ("__cxa_guard_release");
7263 abort_name = get_identifier ("__cxa_guard_abort");
7264 acquire_fn = identifier_global_value (acquire_name);
7265 release_fn = identifier_global_value (release_name);
7266 abort_fn = identifier_global_value (abort_name);
7268 acquire_fn = push_library_fn
7269 (acquire_name, build_function_type_list (integer_type_node,
7270 TREE_TYPE (guard_addr),
7272 NULL_TREE, ECF_NOTHROW | ECF_LEAF);
7273 if (!release_fn || !abort_fn)
7274 vfntype = build_function_type_list (void_type_node,
7275 TREE_TYPE (guard_addr),
7278 release_fn = push_library_fn (release_name, vfntype, NULL_TREE,
7279 ECF_NOTHROW | ECF_LEAF);
7281 abort_fn = push_library_fn (abort_name, vfntype, NULL_TREE,
7282 ECF_NOTHROW | ECF_LEAF);
7284 inner_if_stmt = begin_if_stmt ();
7285 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
7288 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
7289 begin = get_target_expr (boolean_false_node);
7290 flag = TARGET_EXPR_SLOT (begin);
7292 TARGET_EXPR_CLEANUP (begin)
7293 = build3 (COND_EXPR, void_type_node, flag,
7295 build_call_n (abort_fn, 1, guard_addr));
7296 CLEANUP_EH_ONLY (begin) = 1;
7298 /* Do the initialization itself. */
7299 init = add_stmt_to_compound (begin, init);
7300 init = add_stmt_to_compound
7301 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
7302 init = add_stmt_to_compound
7303 (init, build_call_n (release_fn, 1, guard_addr));
7306 init = add_stmt_to_compound (init, set_guard (guard));
7308 /* Use atexit to register a function for destroying this static
7310 init = add_stmt_to_compound (init, register_dtor_fn (decl));
7312 finish_expr_stmt (init);
7316 finish_compound_stmt (inner_then_clause);
7317 finish_then_clause (inner_if_stmt);
7318 finish_if_stmt (inner_if_stmt);
7321 if (!targetm.relaxed_ordering || !thread_guard)
7323 finish_compound_stmt (then_clause);
7324 finish_then_clause (if_stmt);
7325 finish_if_stmt (if_stmt);
7328 else if (DECL_THREAD_LOCAL_P (decl))
7329 tls_aggregates = tree_cons (init, decl, tls_aggregates);
7331 static_aggregates = tree_cons (init, decl, static_aggregates);
7335 /* Make TYPE a complete type based on INITIAL_VALUE.
7336 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
7337 2 if there was no information (in which case assume 0 if DO_DEFAULT),
7338 3 if the initializer list is empty (in pedantic mode). */
7341 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
7344 tree type, elt_type;
7346 /* Don't get confused by a CONSTRUCTOR for some other type. */
7347 if (initial_value && TREE_CODE (initial_value) == CONSTRUCTOR
7348 && !BRACE_ENCLOSED_INITIALIZER_P (initial_value))
7353 unsigned HOST_WIDE_INT i;
7356 /* An array of character type can be initialized from a
7357 brace-enclosed string constant.
7359 FIXME: this code is duplicated from reshape_init. Probably
7360 we should just call reshape_init here? */
7361 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
7362 && TREE_CODE (initial_value) == CONSTRUCTOR
7363 && !vec_safe_is_empty (CONSTRUCTOR_ELTS (initial_value)))
7365 vec<constructor_elt, va_gc> *v = CONSTRUCTOR_ELTS (initial_value);
7366 tree value = (*v)[0].value;
7368 if (TREE_CODE (value) == STRING_CST
7369 && v->length () == 1)
7370 initial_value = value;
7373 /* If any of the elements are parameter packs, we can't actually
7374 complete this type now because the array size is dependent. */
7375 if (TREE_CODE (initial_value) == CONSTRUCTOR)
7377 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value),
7380 if (PACK_EXPANSION_P (value))
7386 failure = complete_array_type (ptype, initial_value, do_default);
7388 /* We can create the array before the element type is complete, which
7389 means that we didn't have these two bits set in the original type
7390 either. In completing the type, we are expected to propagate these
7391 bits. See also complete_type which does the same thing for arrays
7394 if (TYPE_DOMAIN (type))
7396 elt_type = TREE_TYPE (type);
7397 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
7398 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
7399 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
7405 /* As above, but either give an error or reject zero-size arrays, depending
7409 cp_complete_array_type_or_error (tree *ptype, tree initial_value,
7410 bool do_default, tsubst_flags_t complain)
7413 bool sfinae = !(complain & tf_error);
7414 /* In SFINAE context we can't be lenient about zero-size arrays. */
7417 failure = cp_complete_array_type (ptype, initial_value, do_default);
7423 /* Not an error. */;
7424 else if (failure == 1)
7425 error ("initializer fails to determine size of %qT", *ptype);
7426 else if (failure == 2)
7429 error ("array size missing in %qT", *ptype);
7431 else if (failure == 3)
7432 error ("zero-size array %qT", *ptype);
7433 *ptype = error_mark_node;
7438 /* Return zero if something is declared to be a member of type
7439 CTYPE when in the context of CUR_TYPE. STRING is the error
7440 message to print in that case. Otherwise, quietly return 1. */
7443 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
7445 if (ctype && ctype != cur_type)
7447 if (flags == DTOR_FLAG)
7448 error ("destructor for alien class %qT cannot be a member", ctype);
7450 error ("constructor for alien class %qT cannot be a member", ctype);
7456 /* Subroutine of `grokdeclarator'. */
7458 /* Generate errors possibly applicable for a given set of specifiers.
7459 This is for ARM $7.1.2. */
7462 bad_specifiers (tree object,
7463 enum bad_spec_place type,
7474 error ("%qD declared as a %<virtual%> variable", object);
7476 error ("%qD declared as an %<inline%> variable", object);
7478 error ("%<const%> and %<volatile%> function specifiers on "
7479 "%qD invalid in variable declaration", object);
7483 error ("%qD declared as a %<virtual%> parameter", object);
7485 error ("%qD declared as an %<inline%> parameter", object);
7487 error ("%<const%> and %<volatile%> function specifiers on "
7488 "%qD invalid in parameter declaration", object);
7492 error ("%qD declared as a %<virtual%> type", object);
7494 error ("%qD declared as an %<inline%> type", object);
7496 error ("%<const%> and %<volatile%> function specifiers on "
7497 "%qD invalid in type declaration", object);
7501 error ("%qD declared as a %<virtual%> field", object);
7503 error ("%qD declared as an %<inline%> field", object);
7505 error ("%<const%> and %<volatile%> function specifiers on "
7506 "%qD invalid in field declaration", object);
7512 error ("%q+D declared as a friend", object);
7514 && (TREE_CODE (object) == TYPE_DECL
7515 || (!TYPE_PTRFN_P (TREE_TYPE (object))
7516 && !TYPE_REFFN_P (TREE_TYPE (object))
7517 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
7518 error ("%q+D declared with an exception specification", object);
7521 /* DECL is a member function or static data member and is presently
7522 being defined. Check that the definition is taking place in a
7526 check_class_member_definition_namespace (tree decl)
7528 /* These checks only apply to member functions and static data
7530 gcc_assert (VAR_OR_FUNCTION_DECL_P (decl));
7531 /* We check for problems with specializations in pt.c in
7532 check_specialization_namespace, where we can issue better
7534 if (processing_specialization)
7536 /* There are no restrictions on the placement of
7537 explicit instantiations. */
7538 if (processing_explicit_instantiation)
7542 A member function definition that appears outside of the
7543 class definition shall appear in a namespace scope enclosing
7544 the class definition.
7548 The definition for a static data member shall appear in a
7549 namespace scope enclosing the member's class definition. */
7550 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
7551 permerror (input_location, "definition of %qD is not in namespace enclosing %qT",
7552 decl, DECL_CONTEXT (decl));
7555 /* Build a PARM_DECL for the "this" parameter. TYPE is the
7556 METHOD_TYPE for a non-static member function; QUALS are the
7557 cv-qualifiers that apply to the function. */
7560 build_this_parm (tree type, cp_cv_quals quals)
7565 cp_cv_quals this_quals;
7567 if (CLASS_TYPE_P (type))
7570 = cp_build_qualified_type (type, quals & ~TYPE_QUAL_RESTRICT);
7571 this_type = build_pointer_type (this_type);
7574 this_type = type_of_this_parm (type);
7575 /* The `this' parameter is implicitly `const'; it cannot be
7577 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
7578 qual_type = cp_build_qualified_type (this_type, this_quals);
7579 parm = build_artificial_parm (this_identifier, qual_type);
7580 cp_apply_type_quals_to_decl (this_quals, parm);
7584 /* DECL is a static member function. Complain if it was declared
7585 with function-cv-quals. */
7588 check_static_quals (tree decl, cp_cv_quals quals)
7590 if (quals != TYPE_UNQUALIFIED)
7591 error ("static member function %q#D declared with type qualifiers",
7595 /* Helper function. Replace the temporary this parameter injected
7596 during cp_finish_omp_declare_simd with the real this parameter. */
7599 declare_simd_adjust_this (tree *tp, int *walk_subtrees, void *data)
7601 tree this_parm = (tree) data;
7602 if (TREE_CODE (*tp) == PARM_DECL
7603 && DECL_NAME (*tp) == this_identifier
7604 && *tp != this_parm)
7606 else if (TYPE_P (*tp))
7611 /* CTYPE is class type, or null if non-class.
7612 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
7614 DECLARATOR is the function's name.
7615 PARMS is a chain of PARM_DECLs for the function.
7616 VIRTUALP is truthvalue of whether the function is virtual or not.
7617 FLAGS are to be passed through to `grokclassfn'.
7618 QUALS are qualifiers indicating whether the function is `const'
7620 RAISES is a list of exceptions that this function can raise.
7621 CHECK is 1 if we must find this method in CTYPE, 0 if we should
7622 not look, and -1 if we should not call `grokclassfn' at all.
7624 SFK is the kind of special function (if any) for the new function.
7626 Returns `NULL_TREE' if something goes wrong, after issuing
7627 applicable error messages. */
7630 grokfndecl (tree ctype,
7634 tree orig_declarator,
7636 enum overload_flags flags,
7638 cp_ref_qualifier rqual,
7645 special_function_kind sfk,
7650 location_t location)
7653 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
7657 type = build_ref_qualified_type (type, rqual);
7659 type = build_exception_variant (type, raises);
7661 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
7663 /* If we have an explicit location, use it, otherwise use whatever
7664 build_lang_decl used (probably input_location). */
7665 if (location != UNKNOWN_LOCATION)
7666 DECL_SOURCE_LOCATION (decl) = location;
7668 if (TREE_CODE (type) == METHOD_TYPE)
7671 parm = build_this_parm (type, quals);
7672 DECL_CHAIN (parm) = parms;
7675 DECL_ARGUMENTS (decl) = parms;
7676 for (t = parms; t; t = DECL_CHAIN (t))
7677 DECL_CONTEXT (t) = decl;
7678 /* Propagate volatile out from type to decl. */
7679 if (TYPE_VOLATILE (type))
7680 TREE_THIS_VOLATILE (decl) = 1;
7682 /* Setup decl according to sfk. */
7685 case sfk_constructor:
7686 case sfk_copy_constructor:
7687 case sfk_move_constructor:
7688 DECL_CONSTRUCTOR_P (decl) = 1;
7690 case sfk_destructor:
7691 DECL_DESTRUCTOR_P (decl) = 1;
7697 /* If pointers to member functions use the least significant bit to
7698 indicate whether a function is virtual, ensure a pointer
7699 to this function will have that bit clear. */
7700 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
7701 && TREE_CODE (type) == METHOD_TYPE
7702 && DECL_ALIGN (decl) < 2 * BITS_PER_UNIT)
7703 DECL_ALIGN (decl) = 2 * BITS_PER_UNIT;
7706 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
7710 ("defining explicit specialization %qD in friend declaration",
7714 tree fns = TREE_OPERAND (orig_declarator, 0);
7715 tree args = TREE_OPERAND (orig_declarator, 1);
7717 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
7719 /* Something like `template <class T> friend void f<T>()'. */
7720 error ("invalid use of template-id %qD in declaration "
7721 "of primary template",
7727 /* A friend declaration of the form friend void f<>(). Record
7728 the information in the TEMPLATE_ID_EXPR. */
7729 SET_DECL_IMPLICIT_INSTANTIATION (decl);
7731 gcc_assert (identifier_p (fns) || TREE_CODE (fns) == OVERLOAD);
7732 DECL_TEMPLATE_INFO (decl) = build_template_info (fns, args);
7734 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
7735 if (TREE_PURPOSE (t)
7736 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
7738 error ("default arguments are not allowed in declaration "
7739 "of friend template specialization %qD",
7745 error ("%<inline%> is not allowed in declaration of friend "
7746 "template specialization %qD",
7749 error ("%<constexpr%> is not allowed in declaration of friend "
7750 "template specialization %qD",
7757 /* If this decl has namespace scope, set that up. */
7759 set_decl_namespace (decl, in_namespace, friendp);
7761 DECL_CONTEXT (decl) = FROB_CONTEXT (current_decl_namespace ());
7763 /* `main' and builtins have implicit 'C' linkage. */
7764 if ((MAIN_NAME_P (declarator)
7765 || (IDENTIFIER_LENGTH (declarator) > 10
7766 && IDENTIFIER_POINTER (declarator)[0] == '_'
7767 && IDENTIFIER_POINTER (declarator)[1] == '_'
7768 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0)
7769 || (targetcm.cxx_implicit_extern_c
7770 && targetcm.cxx_implicit_extern_c(IDENTIFIER_POINTER (declarator))))
7771 && current_lang_name == lang_name_cplusplus
7772 && ctype == NULL_TREE
7773 && DECL_FILE_SCOPE_P (decl))
7774 SET_DECL_LANGUAGE (decl, lang_c);
7776 /* Should probably propagate const out from type to decl I bet (mrs). */
7779 DECL_STATIC_FUNCTION_P (decl) = 1;
7780 DECL_CONTEXT (decl) = ctype;
7784 DECL_DELETED_FN (decl) = 1;
7788 DECL_CONTEXT (decl) = ctype;
7790 check_class_member_definition_namespace (decl);
7793 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7795 if (PROCESSING_REAL_TEMPLATE_DECL_P())
7796 error ("cannot declare %<::main%> to be a template");
7798 error ("cannot declare %<::main%> to be inline");
7800 error ("cannot declare %<::main%> to be constexpr");
7802 error ("cannot declare %<::main%> to be static");
7807 /* Members of anonymous types and local classes have no linkage; make
7808 them internal. If a typedef is made later, this will be changed. */
7809 if (ctype && (TYPE_ANONYMOUS_P (ctype)
7810 || decl_function_context (TYPE_MAIN_DECL (ctype))))
7813 if (publicp && cxx_dialect == cxx98)
7815 /* [basic.link]: A name with no linkage (notably, the name of a class
7816 or enumeration declared in a local scope) shall not be used to
7817 declare an entity with linkage.
7819 DR 757 relaxes this restriction for C++0x. */
7820 no_linkage_error (decl);
7823 TREE_PUBLIC (decl) = publicp;
7826 DECL_INTERFACE_KNOWN (decl) = 1;
7827 DECL_NOT_REALLY_EXTERN (decl) = 1;
7830 /* If the declaration was declared inline, mark it as such. */
7833 DECL_DECLARED_INLINE_P (decl) = 1;
7835 DECL_COMDAT (decl) = 1;
7838 DECL_DECLARED_CONSTEXPR_P (decl) = true;
7840 DECL_EXTERNAL (decl) = 1;
7841 if (TREE_CODE (type) == FUNCTION_TYPE)
7846 ? G_("static member function %qD cannot have cv-qualifier")
7847 : G_("non-member function %qD cannot have cv-qualifier"),
7849 quals = TYPE_UNQUALIFIED;
7855 ? G_("static member function %qD cannot have ref-qualifier")
7856 : G_("non-member function %qD cannot have ref-qualifier"),
7858 rqual = REF_QUAL_NONE;
7862 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
7863 && !grok_op_properties (decl, /*complain=*/true))
7865 else if (UDLIT_OPER_P (DECL_NAME (decl)))
7867 bool long_long_unsigned_p;
7869 const char *suffix = NULL;
7870 /* [over.literal]/6: Literal operators shall not have C linkage. */
7871 if (DECL_LANGUAGE (decl) == lang_c)
7873 error ("literal operator with C linkage");
7877 if (DECL_NAMESPACE_SCOPE_P (decl))
7879 if (!check_literal_operator_args (decl, &long_long_unsigned_p,
7882 error ("%qD has invalid argument list", decl);
7886 suffix = UDLIT_OP_SUFFIX (DECL_NAME (decl));
7887 if (long_long_unsigned_p)
7889 if (cpp_interpret_int_suffix (parse_in, suffix, strlen (suffix)))
7890 warning (0, "integer suffix %<%s%>"
7891 " shadowed by implementation", suffix);
7893 else if (long_double_p)
7895 if (cpp_interpret_float_suffix (parse_in, suffix, strlen (suffix)))
7896 warning (0, "floating point suffix %<%s%>"
7897 " shadowed by implementation", suffix);
7902 error ("%qD must be a non-member function", decl);
7908 /* Make the init_value nonzero so pushdecl knows this is not
7909 tentative. error_mark_node is replaced later with the BLOCK. */
7910 DECL_INITIAL (decl) = error_mark_node;
7912 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
7913 TREE_NOTHROW (decl) = 1;
7915 if (flag_openmp || flag_openmp_simd || flag_cilkplus)
7917 /* Adjust "omp declare simd" attributes. */
7918 tree ods = lookup_attribute ("omp declare simd", *attrlist);
7922 for (attr = ods; attr;
7923 attr = lookup_attribute ("omp declare simd", TREE_CHAIN (attr)))
7925 if (TREE_CODE (type) == METHOD_TYPE)
7926 walk_tree (&TREE_VALUE (attr), declare_simd_adjust_this,
7927 DECL_ARGUMENTS (decl), NULL);
7928 if (TREE_VALUE (attr) != NULL_TREE)
7930 tree cl = TREE_VALUE (TREE_VALUE (attr));
7931 cl = c_omp_declare_simd_clauses_to_numbers
7932 (DECL_ARGUMENTS (decl), cl);
7934 TREE_VALUE (TREE_VALUE (attr)) = cl;
7936 TREE_VALUE (attr) = NULL_TREE;
7942 /* Caller will do the rest of this. */
7946 if (ctype != NULL_TREE)
7947 grokclassfn (ctype, decl, flags);
7950 if (cxx_dialect >= cxx11
7951 && DECL_DESTRUCTOR_P (decl)
7952 && !TYPE_BEING_DEFINED (DECL_CONTEXT (decl))
7953 && !processing_template_decl)
7954 deduce_noexcept_on_destructor (decl);
7956 decl = check_explicit_specialization (orig_declarator, decl,
7959 4 * (friendp != 0));
7960 if (decl == error_mark_node)
7963 if (DECL_STATIC_FUNCTION_P (decl))
7964 check_static_quals (decl, quals);
7968 cplus_decl_attributes (&decl, *attrlist, 0);
7969 *attrlist = NULL_TREE;
7972 /* Check main's type after attributes have been applied. */
7973 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7975 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
7978 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
7980 error ("%<::main%> must return %<int%>");
7981 newtype = build_function_type (integer_type_node, oldtypeargs);
7982 TREE_TYPE (decl) = newtype;
7985 check_main_parameter_types (decl);
7988 if (ctype != NULL_TREE
7989 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
7992 tree old_decl = check_classfn (ctype, decl,
7993 (processing_template_decl
7994 > template_class_depth (ctype))
7995 ? current_template_parms
7998 if (old_decl == error_mark_node)
8006 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
8007 /* Because grokfndecl is always supposed to return a
8008 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
8009 here. We depend on our callers to figure out that its
8010 really a template that's being returned. */
8011 old_decl = DECL_TEMPLATE_RESULT (old_decl);
8013 if (DECL_STATIC_FUNCTION_P (old_decl)
8014 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
8016 /* Remove the `this' parm added by grokclassfn. */
8017 revert_static_member_fn (decl);
8018 check_static_quals (decl, quals);
8020 if (DECL_ARTIFICIAL (old_decl))
8022 error ("definition of implicitly-declared %qD", old_decl);
8025 else if (DECL_DEFAULTED_FN (old_decl))
8027 error ("definition of explicitly-defaulted %q+D", decl);
8028 error ("%q+#D explicitly defaulted here", old_decl);
8032 /* Since we've smashed OLD_DECL to its
8033 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
8034 if (TREE_CODE (decl) == TEMPLATE_DECL)
8035 decl = DECL_TEMPLATE_RESULT (decl);
8037 /* Attempt to merge the declarations. This can fail, in
8038 the case of some invalid specialization declarations. */
8039 pushed_scope = push_scope (ctype);
8040 ok = duplicate_decls (decl, old_decl, friendp);
8042 pop_scope (pushed_scope);
8045 error ("no %q#D member function declared in class %qT",
8049 if (ok == error_mark_node)
8055 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
8058 if (ctype == NULL_TREE || check)
8062 DECL_VIRTUAL_P (decl) = 1;
8067 /* decl is a FUNCTION_DECL.
8068 specifiers are the parsed virt-specifiers.
8070 Set flags to reflect the virt-specifiers.
8075 set_virt_specifiers (tree decl, cp_virt_specifiers specifiers)
8077 if (decl == NULL_TREE)
8079 if (specifiers & VIRT_SPEC_OVERRIDE)
8080 DECL_OVERRIDE_P (decl) = 1;
8081 if (specifiers & VIRT_SPEC_FINAL)
8082 DECL_FINAL_P (decl) = 1;
8086 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
8087 the linkage that DECL will receive in the object file. */
8090 set_linkage_for_static_data_member (tree decl)
8092 /* A static data member always has static storage duration and
8093 external linkage. Note that static data members are forbidden in
8094 local classes -- the only situation in which a class has
8095 non-external linkage. */
8096 TREE_PUBLIC (decl) = 1;
8097 TREE_STATIC (decl) = 1;
8098 /* For non-template classes, static data members are always put
8099 out in exactly those files where they are defined, just as
8100 with ordinary namespace-scope variables. */
8101 if (!processing_template_decl)
8102 DECL_INTERFACE_KNOWN (decl) = 1;
8105 /* Create a VAR_DECL named NAME with the indicated TYPE.
8107 If SCOPE is non-NULL, it is the class type or namespace containing
8108 the variable. If SCOPE is NULL, the variable should is created in
8109 the innermost enclosing scope. */
8112 grokvardecl (tree type,
8114 tree orig_declarator,
8115 const cp_decl_specifier_seq *declspecs,
8122 tree explicit_scope;
8124 gcc_assert (!name || identifier_p (name));
8126 /* Compute the scope in which to place the variable, but remember
8127 whether or not that scope was explicitly specified by the user. */
8128 explicit_scope = scope;
8131 /* An explicit "extern" specifier indicates a namespace-scope
8133 if (declspecs->storage_class == sc_extern)
8134 scope = current_decl_namespace ();
8135 else if (!at_function_scope_p ())
8136 scope = current_scope ();
8140 && (/* If the variable is a namespace-scope variable declared in a
8141 template, we need DECL_LANG_SPECIFIC. */
8142 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
8143 /* Similarly for namespace-scope variables with language linkage
8145 || (TREE_CODE (scope) == NAMESPACE_DECL
8146 && current_lang_name != lang_name_cplusplus)
8147 /* Similarly for static data members. */
8149 /* Similarly for explicit specializations. */
8151 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)))
8152 decl = build_lang_decl (VAR_DECL, name, type);
8154 decl = build_decl (input_location, VAR_DECL, name, type);
8156 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
8157 set_decl_namespace (decl, explicit_scope, 0);
8159 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
8161 if (declspecs->storage_class == sc_extern)
8163 DECL_THIS_EXTERN (decl) = 1;
8164 DECL_EXTERNAL (decl) = !initialized;
8167 if (DECL_CLASS_SCOPE_P (decl))
8169 set_linkage_for_static_data_member (decl);
8170 /* This function is only called with out-of-class definitions. */
8171 DECL_EXTERNAL (decl) = 0;
8172 check_class_member_definition_namespace (decl);
8174 /* At top level, either `static' or no s.c. makes a definition
8175 (perhaps tentative), and absence of `static' makes it public. */
8176 else if (toplevel_bindings_p ())
8178 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
8179 && (DECL_THIS_EXTERN (decl) || ! constp));
8180 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
8182 /* Not at top level, only `static' makes a static definition. */
8185 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
8186 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
8189 if (decl_spec_seq_has_spec_p (declspecs, ds_thread))
8191 if (DECL_EXTERNAL (decl) || TREE_STATIC (decl))
8192 set_decl_tls_model (decl, decl_default_tls_model (decl));
8193 if (declspecs->gnu_thread_keyword_p)
8194 DECL_GNU_TLS_P (decl) = true;
8197 /* If the type of the decl has no linkage, make sure that we'll
8198 notice that in mark_used. */
8199 if (cxx_dialect > cxx98
8200 && decl_linkage (decl) != lk_none
8201 && DECL_LANG_SPECIFIC (decl) == NULL
8202 && !DECL_EXTERN_C_P (decl)
8203 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
8204 retrofit_lang_decl (decl);
8206 if (TREE_PUBLIC (decl))
8208 /* [basic.link]: A name with no linkage (notably, the name of a class
8209 or enumeration declared in a local scope) shall not be used to
8210 declare an entity with linkage.
8212 DR 757 relaxes this restriction for C++0x. */
8213 if (cxx_dialect < cxx11)
8214 no_linkage_error (decl);
8217 DECL_INTERFACE_KNOWN (decl) = 1;
8219 // Handle explicit specializations and instantiations of variable templates.
8221 /* For GCC 5 fix 65646 this way. */
8222 && current_tmpl_spec_kind (template_count) != tsk_none)
8223 decl = check_explicit_specialization (orig_declarator, decl,
8226 return decl != error_mark_node ? decl : NULL_TREE;
8229 /* Create and return a canonical pointer to member function type, for
8230 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
8233 build_ptrmemfunc_type (tree type)
8238 if (type == error_mark_node)
8241 /* Make sure that we always have the unqualified pointer-to-member
8243 if (cp_cv_quals quals = cp_type_quals (type))
8245 tree unqual = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
8246 return cp_build_qualified_type (unqual, quals);
8249 /* If a canonical type already exists for this type, use it. We use
8250 this method instead of type_hash_canon, because it only does a
8251 simple equality check on the list of field members. */
8253 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
8256 t = make_node (RECORD_TYPE);
8258 /* Let the front end know this is a pointer to member function. */
8259 TYPE_PTRMEMFUNC_FLAG (t) = 1;
8261 field = build_decl (input_location, FIELD_DECL, pfn_identifier, type);
8264 field = build_decl (input_location, FIELD_DECL, delta_identifier,
8266 DECL_CHAIN (field) = fields;
8269 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
8271 /* Zap out the name so that the back end will give us the debugging
8272 information for this anonymous RECORD_TYPE. */
8273 TYPE_NAME (t) = NULL_TREE;
8275 /* Cache this pointer-to-member type so that we can find it again
8277 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
8279 if (TYPE_STRUCTURAL_EQUALITY_P (type))
8280 SET_TYPE_STRUCTURAL_EQUALITY (t);
8281 else if (TYPE_CANONICAL (type) != type)
8282 TYPE_CANONICAL (t) = build_ptrmemfunc_type (TYPE_CANONICAL (type));
8287 /* Create and return a pointer to data member type. */
8290 build_ptrmem_type (tree class_type, tree member_type)
8292 if (TREE_CODE (member_type) == METHOD_TYPE)
8294 cp_cv_quals quals = type_memfn_quals (member_type);
8295 cp_ref_qualifier rqual = type_memfn_rqual (member_type);
8296 member_type = build_memfn_type (member_type, class_type, quals, rqual);
8297 return build_ptrmemfunc_type (build_pointer_type (member_type));
8301 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
8302 return build_offset_type (class_type, member_type);
8306 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
8307 Check to see that the definition is valid. Issue appropriate error
8308 messages. Return 1 if the definition is particularly bad, or 0
8312 check_static_variable_definition (tree decl, tree type)
8314 /* Can't check yet if we don't know the type. */
8315 if (dependent_type_p (type))
8317 /* If DECL is declared constexpr, we'll do the appropriate checks
8318 in check_initializer. */
8319 if (DECL_P (decl) && DECL_DECLARED_CONSTEXPR_P (decl))
8321 else if (cxx_dialect >= cxx11 && !INTEGRAL_OR_ENUMERATION_TYPE_P (type))
8323 if (!COMPLETE_TYPE_P (type))
8324 error ("in-class initialization of static data member %q#D of "
8325 "incomplete type", decl);
8326 else if (literal_type_p (type))
8327 permerror (input_location,
8328 "%<constexpr%> needed for in-class initialization of "
8329 "static data member %q#D of non-integral type", decl);
8331 error ("in-class initialization of static data member %q#D of "
8332 "non-literal type", decl);
8336 /* Motion 10 at San Diego: If a static const integral data member is
8337 initialized with an integral constant expression, the initializer
8338 may appear either in the declaration (within the class), or in
8339 the definition, but not both. If it appears in the class, the
8340 member is a member constant. The file-scope definition is always
8342 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
8344 error ("invalid in-class initialization of static data member "
8345 "of non-integral type %qT",
8349 else if (!CP_TYPE_CONST_P (type))
8350 error ("ISO C++ forbids in-class initialization of non-const "
8351 "static member %qD",
8353 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type))
8354 pedwarn (input_location, OPT_Wpedantic, "ISO C++ forbids initialization of member constant "
8355 "%qD of non-integral type %qT", decl, type);
8360 /* *expr_p is part of the TYPE_SIZE of a variably-sized array. If any
8361 SAVE_EXPRs in *expr_p wrap expressions with side-effects, break those
8362 expressions out into temporary variables so that walk_tree doesn't
8363 step into them (c++/15764). */
8366 stabilize_save_expr_r (tree *expr_p, int *walk_subtrees, void *data)
8368 hash_set<tree> *pset = (hash_set<tree> *)data;
8369 tree expr = *expr_p;
8370 if (TREE_CODE (expr) == SAVE_EXPR)
8372 tree op = TREE_OPERAND (expr, 0);
8373 cp_walk_tree (&op, stabilize_save_expr_r, data, pset);
8374 if (TREE_SIDE_EFFECTS (op))
8375 TREE_OPERAND (expr, 0) = get_temp_regvar (TREE_TYPE (op), op);
8378 else if (!EXPR_P (expr) || !TREE_SIDE_EFFECTS (expr))
8383 /* Entry point for the above. */
8386 stabilize_vla_size (tree size)
8388 hash_set<tree> pset;
8389 /* Break out any function calls into temporary variables. */
8390 cp_walk_tree (&size, stabilize_save_expr_r, &pset, &pset);
8393 /* Helper function for compute_array_index_type. Look for SIZEOF_EXPR
8394 not inside of SAVE_EXPR and fold them. */
8397 fold_sizeof_expr_r (tree *expr_p, int *walk_subtrees, void *data)
8399 tree expr = *expr_p;
8400 if (TREE_CODE (expr) == SAVE_EXPR || TYPE_P (expr))
8402 else if (TREE_CODE (expr) == SIZEOF_EXPR)
8404 *(bool *)data = true;
8405 if (SIZEOF_EXPR_TYPE_P (expr))
8406 expr = cxx_sizeof_or_alignof_type (TREE_TYPE (TREE_OPERAND (expr, 0)),
8407 SIZEOF_EXPR, false);
8408 else if (TYPE_P (TREE_OPERAND (expr, 0)))
8409 expr = cxx_sizeof_or_alignof_type (TREE_OPERAND (expr, 0), SIZEOF_EXPR,
8412 expr = cxx_sizeof_or_alignof_expr (TREE_OPERAND (expr, 0), SIZEOF_EXPR,
8414 if (expr == error_mark_node)
8415 expr = size_one_node;
8422 /* Given the SIZE (i.e., number of elements) in an array, compute an
8423 appropriate index type for the array. If non-NULL, NAME is the
8424 name of the thing being declared. */
8427 compute_array_index_type (tree name, tree size, tsubst_flags_t complain)
8432 if (error_operand_p (size))
8433 return error_mark_node;
8435 if (!type_dependent_expression_p (size))
8437 tree type = TREE_TYPE (size);
8439 mark_rvalue_use (size);
8441 if (cxx_dialect < cxx11 && TREE_CODE (size) == NOP_EXPR
8442 && TREE_SIDE_EFFECTS (size))
8443 /* In C++98, we mark a non-constant array bound with a magic
8444 NOP_EXPR with TREE_SIDE_EFFECTS; don't fold in that case. */;
8447 size = instantiate_non_dependent_expr_sfinae (size, complain);
8449 if (CLASS_TYPE_P (type)
8450 && CLASSTYPE_LITERAL_P (type))
8452 size = build_expr_type_conversion (WANT_INT, size, true);
8455 if (!(complain & tf_error))
8456 return error_mark_node;
8458 error ("size of array %qD has non-integral type %qT",
8461 error ("size of array has non-integral type %qT", type);
8462 size = integer_one_node;
8464 if (size == error_mark_node)
8465 return error_mark_node;
8466 type = TREE_TYPE (size);
8469 if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
8470 size = maybe_constant_value (size);
8472 if (!TREE_CONSTANT (size))
8476 if (error_operand_p (size))
8477 return error_mark_node;
8479 /* The array bound must be an integer type. */
8480 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
8482 if (!(complain & tf_error))
8483 return error_mark_node;
8485 error ("size of array %qD has non-integral type %qT", name, type);
8487 error ("size of array has non-integral type %qT", type);
8488 size = integer_one_node;
8489 type = TREE_TYPE (size);
8493 /* A type is dependent if it is...an array type constructed from any
8494 dependent type or whose size is specified by a constant expression
8495 that is value-dependent. */
8496 /* We can only call value_dependent_expression_p on integral constant
8497 expressions; treat non-constant expressions as dependent, too. */
8498 if (processing_template_decl
8499 && (type_dependent_expression_p (size)
8500 || !TREE_CONSTANT (size) || value_dependent_expression_p (size)))
8502 /* We cannot do any checking for a SIZE that isn't known to be
8503 constant. Just build the index type and mark that it requires
8504 structural equality checks. */
8505 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
8506 size, size_one_node));
8507 TYPE_DEPENDENT_P (itype) = 1;
8508 TYPE_DEPENDENT_P_VALID (itype) = 1;
8509 SET_TYPE_STRUCTURAL_EQUALITY (itype);
8513 /* Normally, the array-bound will be a constant. */
8514 if (TREE_CODE (size) == INTEGER_CST)
8516 /* Check to see if the array bound overflowed. Make that an
8517 error, no matter how generous we're being. */
8518 constant_expression_error (size);
8520 /* An array must have a positive number of elements. */
8521 if (tree_int_cst_lt (size, integer_zero_node))
8523 if (!(complain & tf_error))
8524 return error_mark_node;
8526 error ("size of array %qD is negative", name);
8528 error ("size of array is negative");
8529 size = integer_one_node;
8531 /* As an extension we allow zero-sized arrays. */
8532 else if (integer_zerop (size))
8534 if (!(complain & tf_error))
8535 /* We must fail if performing argument deduction (as
8536 indicated by the state of complain), so that
8537 another substitution can be found. */
8538 return error_mark_node;
8539 else if (in_system_header_at (input_location))
8540 /* Allow them in system headers because glibc uses them. */;
8542 pedwarn (input_location, OPT_Wpedantic, "ISO C++ forbids zero-size array %qD", name);
8544 pedwarn (input_location, OPT_Wpedantic, "ISO C++ forbids zero-size array");
8547 else if (TREE_CONSTANT (size)
8548 /* We don't allow VLAs at non-function scopes, or during
8549 tentative template substitution. */
8550 || !at_function_scope_p ()
8551 || !(complain & tf_error))
8553 if (!(complain & tf_error))
8554 return error_mark_node;
8555 /* `(int) &fn' is not a valid array bound. */
8557 error ("size of array %qD is not an integral constant-expression",
8560 error ("size of array is not an integral constant-expression");
8561 size = integer_one_node;
8563 else if (pedantic && warn_vla != 0)
8566 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array %qD", name);
8568 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array");
8570 else if (warn_vla > 0)
8574 "variable length array %qD is used", name);
8577 "variable length array is used");
8580 if (processing_template_decl && !TREE_CONSTANT (size))
8581 /* A variable sized array. */
8582 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
8585 HOST_WIDE_INT saved_processing_template_decl;
8587 /* Compute the index of the largest element in the array. It is
8588 one less than the number of elements in the array. We save
8589 and restore PROCESSING_TEMPLATE_DECL so that computations in
8590 cp_build_binary_op will be appropriately folded. */
8591 saved_processing_template_decl = processing_template_decl;
8592 processing_template_decl = 0;
8593 itype = cp_build_binary_op (input_location,
8595 cp_convert (ssizetype, size, complain),
8596 cp_convert (ssizetype, integer_one_node,
8599 itype = fold (itype);
8600 processing_template_decl = saved_processing_template_decl;
8602 if (!TREE_CONSTANT (itype))
8604 /* A variable sized array. */
8605 itype = variable_size (itype);
8607 if (TREE_CODE (itype) != SAVE_EXPR)
8609 /* Look for SIZEOF_EXPRs in itype and fold them, otherwise
8610 they might survive till gimplification. */
8611 tree newitype = itype;
8613 cp_walk_tree_without_duplicates (&newitype,
8614 fold_sizeof_expr_r, &found);
8616 itype = variable_size (fold (newitype));
8619 stabilize_vla_size (itype);
8621 if (flag_sanitize & SANITIZE_VLA
8622 && do_ubsan_in_current_function ())
8624 /* We have to add 1 -- in the ubsan routine we generate
8625 LE_EXPR rather than LT_EXPR. */
8626 tree t = fold_build2 (PLUS_EXPR, TREE_TYPE (itype), itype,
8627 build_one_cst (TREE_TYPE (itype)));
8628 t = ubsan_instrument_vla (input_location, t);
8629 finish_expr_stmt (t);
8632 /* Make sure that there was no overflow when creating to a signed
8633 index type. (For example, on a 32-bit machine, an array with
8634 size 2^32 - 1 is too big.) */
8635 else if (TREE_CODE (itype) == INTEGER_CST
8636 && TREE_OVERFLOW (itype))
8638 if (!(complain & tf_error))
8639 return error_mark_node;
8640 error ("overflow in array dimension");
8641 TREE_OVERFLOW (itype) = 0;
8645 /* Create and return the appropriate index type. */
8646 itype = build_index_type (itype);
8648 /* If the index type were dependent, we would have returned early, so
8649 remember that it isn't. */
8650 TYPE_DEPENDENT_P (itype) = 0;
8651 TYPE_DEPENDENT_P_VALID (itype) = 1;
8655 /* Returns the scope (if any) in which the entity declared by
8656 DECLARATOR will be located. If the entity was declared with an
8657 unqualified name, NULL_TREE is returned. */
8660 get_scope_of_declarator (const cp_declarator *declarator)
8662 while (declarator && declarator->kind != cdk_id)
8663 declarator = declarator->declarator;
8665 /* If the declarator-id is a SCOPE_REF, the scope in which the
8666 declaration occurs is the first operand. */
8668 && declarator->u.id.qualifying_scope)
8669 return declarator->u.id.qualifying_scope;
8671 /* Otherwise, the declarator is not a qualified name; the entity will
8672 be declared in the current scope. */
8676 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
8677 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
8681 create_array_type_for_decl (tree name, tree type, tree size)
8683 tree itype = NULL_TREE;
8685 /* If things have already gone awry, bail now. */
8686 if (type == error_mark_node || size == error_mark_node)
8687 return error_mark_node;
8689 /* 8.3.4/1: If the type of the identifier of D contains the auto
8690 type-specifier, the program is ill-formed. */
8691 if (type_uses_auto (type))
8693 error ("%qD declared as array of %qT", name, type);
8694 return error_mark_node;
8697 /* If there are some types which cannot be array elements,
8698 issue an error-message and return. */
8699 switch (TREE_CODE (type))
8703 error ("declaration of %qD as array of void", name);
8705 error ("creating array of void");
8706 return error_mark_node;
8710 error ("declaration of %qD as array of functions", name);
8712 error ("creating array of functions");
8713 return error_mark_node;
8715 case REFERENCE_TYPE:
8717 error ("declaration of %qD as array of references", name);
8719 error ("creating array of references");
8720 return error_mark_node;
8724 error ("declaration of %qD as array of function members", name);
8726 error ("creating array of function members");
8727 return error_mark_node;
8735 The constant expressions that specify the bounds of the arrays
8736 can be omitted only for the first member of the sequence. */
8737 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
8740 error ("declaration of %qD as multidimensional array must "
8741 "have bounds for all dimensions except the first",
8744 error ("multidimensional array must have bounds for all "
8745 "dimensions except the first");
8747 return error_mark_node;
8750 /* Figure out the index type for the array. */
8752 itype = compute_array_index_type (name, size, tf_warning_or_error);
8755 T is called the array element type; this type shall not be [...] an
8756 abstract class type. */
8757 abstract_virtuals_error (name, type);
8759 return build_cplus_array_type (type, itype);
8762 /* Check that it's OK to declare a function with the indicated TYPE.
8763 SFK indicates the kind of special function (if any) that this
8764 function is. OPTYPE is the type given in a conversion operator
8765 declaration, or the class type for a constructor/destructor.
8766 Returns the actual return type of the function; that
8767 may be different than TYPE if an error occurs, or for certain
8768 special functions. */
8771 check_special_function_return_type (special_function_kind sfk,
8777 case sfk_constructor:
8779 error ("return type specification for constructor invalid");
8781 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
8782 type = build_pointer_type (optype);
8784 type = void_type_node;
8787 case sfk_destructor:
8789 error ("return type specification for destructor invalid");
8790 /* We can't use the proper return type here because we run into
8791 problems with ambiguous bases and covariant returns.
8792 Java classes are left unchanged because (void *) isn't a valid
8793 Java type, and we don't want to change the Java ABI. */
8794 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
8795 type = build_pointer_type (void_type_node);
8797 type = void_type_node;
8800 case sfk_conversion:
8802 error ("return type specified for %<operator %T%>", optype);
8813 /* A variable or data member (whose unqualified name is IDENTIFIER)
8814 has been declared with the indicated TYPE. If the TYPE is not
8815 acceptable, issue an error message and return a type to use for
8816 error-recovery purposes. */
8819 check_var_type (tree identifier, tree type)
8821 if (VOID_TYPE_P (type))
8824 error ("unnamed variable or field declared void");
8825 else if (identifier_p (identifier))
8827 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
8828 error ("variable or field %qE declared void", identifier);
8831 error ("variable or field declared void");
8832 type = error_mark_node;
8838 /* Given declspecs and a declarator (abstract or otherwise), determine
8839 the name and type of the object declared and construct a DECL node
8842 DECLSPECS points to the representation of declaration-specifier
8843 sequence that precedes declarator.
8845 DECL_CONTEXT says which syntactic context this declaration is in:
8846 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
8847 FUNCDEF for a function definition. Like NORMAL but a few different
8848 error messages in each case. Return value may be zero meaning
8849 this definition is too screwy to try to parse.
8850 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
8851 handle member functions (which have FIELD context).
8852 Return value may be zero meaning this definition is too screwy to
8854 PARM for a parameter declaration (either within a function prototype
8855 or before a function body). Make a PARM_DECL, or return void_type_node.
8856 TPARM for a template parameter declaration.
8857 CATCHPARM for a parameter declaration before a catch clause.
8858 TYPENAME if for a typename (in a cast or sizeof).
8859 Don't make a DECL node; just return the ..._TYPE node.
8860 FIELD for a struct or union field; make a FIELD_DECL.
8861 BITFIELD for a field with specified width.
8863 INITIALIZED is as for start_decl.
8865 ATTRLIST is a pointer to the list of attributes, which may be NULL
8866 if there are none; *ATTRLIST may be modified if attributes from inside
8867 the declarator should be applied to the declaration.
8869 When this function is called, scoping variables (such as
8870 CURRENT_CLASS_TYPE) should reflect the scope in which the
8871 declaration occurs, not the scope in which the new declaration will
8872 be placed. For example, on:
8876 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
8879 Returns a DECL (if a declarator is present), a TYPE (if there is no
8880 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
8884 grokdeclarator (const cp_declarator *declarator,
8885 cp_decl_specifier_seq *declspecs,
8886 enum decl_context decl_context,
8890 tree type = NULL_TREE;
8892 int explicit_intN = 0;
8893 int virtualp, explicitp, friendp, inlinep, staticp;
8894 int explicit_int = 0;
8895 int explicit_char = 0;
8896 int defaulted_int = 0;
8898 tree typedef_decl = NULL_TREE;
8899 const char *name = NULL;
8900 tree typedef_type = NULL_TREE;
8901 /* True if this declarator is a function definition. */
8902 bool funcdef_flag = false;
8903 cp_declarator_kind innermost_code = cdk_error;
8906 /* See the code below that used this. */
8907 tree decl_attr = NULL_TREE;
8910 /* Keep track of what sort of function is being processed
8911 so that we can warn about default return values, or explicit
8912 return values which do not match prescribed defaults. */
8913 special_function_kind sfk = sfk_none;
8915 tree dname = NULL_TREE;
8916 tree ctor_return_type = NULL_TREE;
8917 enum overload_flags flags = NO_SPECIAL;
8918 /* cv-qualifiers that apply to the declarator, for a declaration of
8919 a member function. */
8920 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
8921 /* virt-specifiers that apply to the declarator, for a declaration of
8922 a member function. */
8923 cp_virt_specifiers virt_specifiers = VIRT_SPEC_UNSPECIFIED;
8924 /* ref-qualifier that applies to the declarator, for a declaration of
8925 a member function. */
8926 cp_ref_qualifier rqual = REF_QUAL_NONE;
8927 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
8929 tree raises = NULL_TREE;
8930 int template_count = 0;
8931 tree returned_attrs = NULL_TREE;
8932 tree parms = NULL_TREE;
8933 const cp_declarator *id_declarator;
8934 /* The unqualified name of the declarator; either an
8935 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
8936 tree unqualified_id;
8937 /* The class type, if any, in which this entity is located,
8938 or NULL_TREE if none. Note that this value may be different from
8939 the current class type; for example if an attempt is made to declare
8940 "A::f" inside "B", this value will be "A". */
8941 tree ctype = current_class_type;
8942 /* The NAMESPACE_DECL for the namespace in which this entity is
8943 located. If an unqualified name is used to declare the entity,
8944 this value will be NULL_TREE, even if the entity is located at
8946 tree in_namespace = NULL_TREE;
8947 cp_storage_class storage_class;
8948 bool unsigned_p, signed_p, short_p, long_p, thread_p;
8949 bool type_was_error_mark_node = false;
8950 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
8951 bool template_type_arg = false;
8952 bool template_parm_flag = false;
8953 bool typedef_p = decl_spec_seq_has_spec_p (declspecs, ds_typedef);
8954 bool constexpr_p = decl_spec_seq_has_spec_p (declspecs, ds_constexpr);
8955 bool late_return_type_p = false;
8956 bool array_parameter_p = false;
8957 source_location saved_loc = input_location;
8960 signed_p = decl_spec_seq_has_spec_p (declspecs, ds_signed);
8961 unsigned_p = decl_spec_seq_has_spec_p (declspecs, ds_unsigned);
8962 short_p = decl_spec_seq_has_spec_p (declspecs, ds_short);
8963 long_p = decl_spec_seq_has_spec_p (declspecs, ds_long);
8964 longlong = decl_spec_seq_has_spec_p (declspecs, ds_long_long);
8965 explicit_intN = declspecs->explicit_intN_p;
8966 thread_p = decl_spec_seq_has_spec_p (declspecs, ds_thread);
8968 if (decl_context == FUNCDEF)
8969 funcdef_flag = true, decl_context = NORMAL;
8970 else if (decl_context == MEMFUNCDEF)
8971 funcdef_flag = true, decl_context = FIELD;
8972 else if (decl_context == BITFIELD)
8973 bitfield = 1, decl_context = FIELD;
8974 else if (decl_context == TEMPLATE_TYPE_ARG)
8975 template_type_arg = true, decl_context = TYPENAME;
8976 else if (decl_context == TPARM)
8977 template_parm_flag = true, decl_context = PARM;
8979 if (initialized > 1)
8980 funcdef_flag = true;
8982 /* Look inside a declarator for the name being declared
8983 and get it as a string, for an error message. */
8984 for (id_declarator = declarator;
8986 id_declarator = id_declarator->declarator)
8988 if (id_declarator->kind != cdk_id)
8989 innermost_code = id_declarator->kind;
8991 switch (id_declarator->kind)
8994 if (id_declarator->declarator
8995 && id_declarator->declarator->kind == cdk_id)
8997 sfk = id_declarator->declarator->u.id.sfk;
8998 if (sfk == sfk_destructor)
9005 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
9006 tree decl = id_declarator->u.id.unqualified_name;
9009 if (qualifying_scope)
9011 if (at_function_scope_p ())
9015 A declarator-id shall not be qualified except
9018 None of the cases are permitted in block
9020 if (qualifying_scope == global_namespace)
9021 error ("invalid use of qualified-name %<::%D%>",
9023 else if (TYPE_P (qualifying_scope))
9024 error ("invalid use of qualified-name %<%T::%D%>",
9025 qualifying_scope, decl);
9027 error ("invalid use of qualified-name %<%D::%D%>",
9028 qualifying_scope, decl);
9029 return error_mark_node;
9031 else if (TYPE_P (qualifying_scope))
9033 ctype = qualifying_scope;
9034 if (!MAYBE_CLASS_TYPE_P (ctype))
9036 error ("%q#T is not a class or a namespace", ctype);
9039 else if (innermost_code != cdk_function
9040 && current_class_type
9041 && !uniquely_derived_from_p (ctype,
9042 current_class_type))
9044 error ("invalid use of qualified-name %<%T::%D%>",
9045 qualifying_scope, decl);
9046 return error_mark_node;
9049 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
9050 in_namespace = qualifying_scope;
9052 switch (TREE_CODE (decl))
9058 if (innermost_code != cdk_function)
9060 error ("declaration of %qD as non-function", decl);
9061 return error_mark_node;
9063 else if (!qualifying_scope
9064 && !(current_class_type && at_class_scope_p ()))
9066 error ("declaration of %qD as non-member", decl);
9067 return error_mark_node;
9070 type = TREE_OPERAND (decl, 0);
9072 type = constructor_name (type);
9073 name = identifier_to_locale (IDENTIFIER_POINTER (type));
9078 case TEMPLATE_ID_EXPR:
9080 tree fns = TREE_OPERAND (decl, 0);
9083 if (!identifier_p (dname))
9085 if (variable_template_p (dname))
9086 dname = DECL_NAME (dname);
9089 gcc_assert (is_overloaded_fn (dname));
9090 dname = DECL_NAME (get_first_fn (dname));
9096 case IDENTIFIER_NODE:
9097 if (identifier_p (decl))
9100 if (C_IS_RESERVED_WORD (dname))
9102 error ("declarator-id missing; using reserved word %qD",
9104 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
9106 else if (!IDENTIFIER_TYPENAME_P (dname))
9107 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
9110 gcc_assert (flags == NO_SPECIAL);
9111 flags = TYPENAME_FLAG;
9112 ctor_return_type = TREE_TYPE (dname);
9113 sfk = sfk_conversion;
9114 if (is_typename_at_global_scope (dname))
9115 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
9117 name = "<invalid operator>";
9134 return error_mark_node;
9139 if (id_declarator->kind == cdk_id)
9145 The declarator in a function-definition shall have the form
9146 D1 ( parameter-declaration-clause) ... */
9147 if (funcdef_flag && innermost_code != cdk_function)
9149 error ("function definition does not declare parameters");
9150 return error_mark_node;
9153 if (flags == TYPENAME_FLAG
9154 && innermost_code != cdk_function
9155 && ! (ctype && !declspecs->any_specifiers_p))
9157 error ("declaration of %qD as non-function", dname);
9158 return error_mark_node;
9162 && identifier_p (dname)
9163 && UDLIT_OPER_P (dname)
9164 && innermost_code != cdk_function)
9166 error ("declaration of %qD as non-function", dname);
9167 return error_mark_node;
9170 if (dname && IDENTIFIER_OPNAME_P (dname))
9174 error ("declaration of %qD as %<typedef%>", dname);
9175 return error_mark_node;
9177 else if (decl_context == PARM || decl_context == CATCHPARM)
9179 error ("declaration of %qD as parameter", dname);
9180 return error_mark_node;
9184 /* Anything declared one level down from the top level
9185 must be one of the parameters of a function
9186 (because the body is at least two levels down). */
9188 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
9189 by not allowing C++ class definitions to specify their parameters
9190 with xdecls (must be spec.d in the parmlist).
9192 Since we now wait to push a class scope until we are sure that
9193 we are in a legitimate method context, we must set oldcname
9194 explicitly (since current_class_name is not yet alive).
9196 We also want to avoid calling this a PARM if it is in a namespace. */
9198 if (decl_context == NORMAL && !toplevel_bindings_p ())
9200 cp_binding_level *b = current_binding_level;
9201 current_binding_level = b->level_chain;
9202 if (current_binding_level != 0 && toplevel_bindings_p ())
9203 decl_context = PARM;
9204 current_binding_level = b;
9208 name = decl_context == PARM ? "parameter" : "type name";
9210 if (constexpr_p && typedef_p)
9212 error ("%<constexpr%> cannot appear in a typedef declaration");
9213 return error_mark_node;
9216 /* If there were multiple types specified in the decl-specifier-seq,
9217 issue an error message. */
9218 if (declspecs->multiple_types_p)
9220 error ("two or more data types in declaration of %qs", name);
9221 return error_mark_node;
9224 if (declspecs->conflicting_specifiers_p)
9226 error ("conflicting specifiers in declaration of %qs", name);
9227 return error_mark_node;
9230 /* Extract the basic type from the decl-specifier-seq. */
9231 type = declspecs->type;
9232 if (type == error_mark_node)
9235 type_was_error_mark_node = true;
9237 /* If the entire declaration is itself tagged as deprecated then
9238 suppress reports of deprecated items. */
9239 if (type && TREE_DEPRECATED (type)
9240 && deprecated_state != DEPRECATED_SUPPRESS)
9241 warn_deprecated_use (type, NULL_TREE);
9242 if (type && TREE_CODE (type) == TYPE_DECL)
9244 typedef_decl = type;
9245 type = TREE_TYPE (typedef_decl);
9246 if (TREE_DEPRECATED (type)
9247 && DECL_ARTIFICIAL (typedef_decl)
9248 && deprecated_state != DEPRECATED_SUPPRESS)
9249 warn_deprecated_use (type, NULL_TREE);
9251 /* No type at all: default to `int', and set DEFAULTED_INT
9252 because it was not a user-defined typedef. */
9253 if (type == NULL_TREE)
9255 if (signed_p || unsigned_p || long_p || short_p)
9257 /* These imply 'int'. */
9258 type = integer_type_node;
9261 /* If we just have "complex", it is equivalent to "complex double". */
9262 else if (!longlong && !explicit_intN
9263 && decl_spec_seq_has_spec_p (declspecs, ds_complex))
9265 type = double_type_node;
9266 pedwarn (declspecs->locations[ds_complex], OPT_Wpedantic,
9267 "ISO C++ does not support plain %<complex%> meaning "
9268 "%<double complex%>");
9272 explicit_int = declspecs->explicit_int_p;
9273 explicit_char = declspecs->explicit_char_p;
9276 /* See the code below that used this. */
9278 decl_attr = DECL_ATTRIBUTES (typedef_decl);
9280 typedef_type = type;
9283 if (sfk != sfk_conversion)
9284 ctor_return_type = ctype;
9286 if (sfk != sfk_none)
9287 type = check_special_function_return_type (sfk, type,
9289 else if (type == NULL_TREE)
9295 /* We handle `main' specially here, because 'main () { }' is so
9296 common. With no options, it is allowed. With -Wreturn-type,
9297 it is a warning. It is only an error with -pedantic-errors. */
9298 is_main = (funcdef_flag
9299 && dname && identifier_p (dname)
9300 && MAIN_NAME_P (dname)
9301 && ctype == NULL_TREE
9302 && in_namespace == NULL_TREE
9303 && current_namespace == global_namespace);
9305 if (type_was_error_mark_node)
9306 /* We've already issued an error, don't complain more. */;
9307 else if (in_system_header_at (input_location) || flag_ms_extensions)
9308 /* Allow it, sigh. */;
9310 permerror (input_location, "ISO C++ forbids declaration of %qs with no type", name);
9312 pedwarn (input_location, OPT_Wpedantic,
9313 "ISO C++ forbids declaration of %qs with no type", name);
9315 warning (OPT_Wreturn_type,
9316 "ISO C++ forbids declaration of %qs with no type", name);
9318 type = integer_type_node;
9325 if (! int_n_enabled_p[declspecs->int_n_idx])
9327 error ("%<__int%d%> is not supported by this target",
9328 int_n_data[declspecs->int_n_idx].bitsize);
9329 explicit_intN = false;
9331 else if (pedantic && ! in_system_header_at (input_location))
9332 pedwarn (input_location, OPT_Wpedantic,
9333 "ISO C++ does not support %<__int%d%> for %qs",
9334 int_n_data[declspecs->int_n_idx].bitsize, name);
9337 /* Now process the modifiers that were specified
9338 and check for invalid combinations. */
9340 /* Long double is a special combination. */
9341 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
9344 type = cp_build_qualified_type (long_double_type_node,
9345 cp_type_quals (type));
9348 /* Check all other uses of type modifiers. */
9350 if (unsigned_p || signed_p || long_p || short_p)
9354 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
9355 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
9356 else if (signed_p && unsigned_p)
9357 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
9358 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
9359 error ("%<long long%> invalid for %qs", name);
9360 else if (long_p && TREE_CODE (type) == REAL_TYPE)
9361 error ("%<long%> invalid for %qs", name);
9362 else if (short_p && TREE_CODE (type) == REAL_TYPE)
9363 error ("%<short%> invalid for %qs", name);
9364 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
9365 error ("%<long%> or %<short%> invalid for %qs", name);
9366 else if ((long_p || short_p || explicit_char || explicit_int) && explicit_intN)
9367 error ("%<long%>, %<int%>, %<short%>, or %<char%> invalid for %qs", name);
9368 else if ((long_p || short_p) && explicit_char)
9369 error ("%<long%> or %<short%> specified with char for %qs", name);
9370 else if (long_p && short_p)
9371 error ("%<long%> and %<short%> specified together for %qs", name);
9372 else if (type == char16_type_node || type == char32_type_node)
9374 if (signed_p || unsigned_p)
9375 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
9376 else if (short_p || long_p)
9377 error ("%<short%> or %<long%> invalid for %qs", name);
9382 if (!explicit_int && !defaulted_int && !explicit_char && !explicit_intN && pedantic)
9384 pedwarn (input_location, OPT_Wpedantic,
9385 "long, short, signed or unsigned used invalidly for %qs",
9387 if (flag_pedantic_errors)
9392 /* Discard the type modifiers if they are invalid. */
9403 /* Decide whether an integer type is signed or not.
9404 Optionally treat bitfields as signed by default. */
9408 It is implementation-defined whether a plain (neither
9409 explicitly signed or unsigned) char, short, int, or long
9410 bit-field is signed or unsigned.
9412 Naturally, we extend this to long long as well. Note that
9413 this does not include wchar_t. */
9414 || (bitfield && !flag_signed_bitfields
9416 /* A typedef for plain `int' without `signed' can be
9417 controlled just like plain `int', but a typedef for
9418 `signed int' cannot be so controlled. */
9420 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
9421 && TREE_CODE (type) == INTEGER_TYPE
9422 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
9425 type = int_n_trees[declspecs->int_n_idx].unsigned_type;
9427 type = long_long_unsigned_type_node;
9429 type = long_unsigned_type_node;
9431 type = short_unsigned_type_node;
9432 else if (type == char_type_node)
9433 type = unsigned_char_type_node;
9434 else if (typedef_decl)
9435 type = unsigned_type_for (type);
9437 type = unsigned_type_node;
9439 else if (signed_p && type == char_type_node)
9440 type = signed_char_type_node;
9441 else if (explicit_intN)
9442 type = int_n_trees[declspecs->int_n_idx].signed_type;
9444 type = long_long_integer_type_node;
9446 type = long_integer_type_node;
9448 type = short_integer_type_node;
9450 if (decl_spec_seq_has_spec_p (declspecs, ds_complex))
9452 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
9453 error ("complex invalid for %qs", name);
9454 /* If a modifier is specified, the resulting complex is the complex
9455 form of TYPE. E.g, "complex short" is "complex short int". */
9456 else if (type == integer_type_node)
9457 type = complex_integer_type_node;
9458 else if (type == float_type_node)
9459 type = complex_float_type_node;
9460 else if (type == double_type_node)
9461 type = complex_double_type_node;
9462 else if (type == long_double_type_node)
9463 type = complex_long_double_type_node;
9465 type = build_complex_type (type);
9468 type_quals = TYPE_UNQUALIFIED;
9469 if (decl_spec_seq_has_spec_p (declspecs, ds_const))
9470 type_quals |= TYPE_QUAL_CONST;
9471 if (decl_spec_seq_has_spec_p (declspecs, ds_volatile))
9472 type_quals |= TYPE_QUAL_VOLATILE;
9473 if (decl_spec_seq_has_spec_p (declspecs, ds_restrict))
9474 type_quals |= TYPE_QUAL_RESTRICT;
9475 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
9476 error ("qualifiers are not allowed on declaration of %<operator %T%>",
9479 /* If we're using the injected-class-name to form a compound type or a
9480 declaration, replace it with the underlying class so we don't get
9481 redundant typedefs in the debug output. But if we are returning the
9482 type unchanged, leave it alone so that it's available to
9483 maybe_get_template_decl_from_type_decl. */
9484 if (CLASS_TYPE_P (type)
9485 && DECL_SELF_REFERENCE_P (TYPE_NAME (type))
9486 && type == TREE_TYPE (TYPE_NAME (type))
9487 && (declarator || type_quals))
9488 type = DECL_ORIGINAL_TYPE (TYPE_NAME (type));
9490 type_quals |= cp_type_quals (type);
9491 type = cp_build_qualified_type_real
9492 (type, type_quals, ((((typedef_decl && !DECL_ARTIFICIAL (typedef_decl))
9493 || declspecs->decltype_p)
9494 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
9495 /* We might have ignored or rejected some of the qualifiers. */
9496 type_quals = cp_type_quals (type);
9499 inlinep = decl_spec_seq_has_spec_p (declspecs, ds_inline);
9500 virtualp = decl_spec_seq_has_spec_p (declspecs, ds_virtual);
9501 explicitp = decl_spec_seq_has_spec_p (declspecs, ds_explicit);
9503 storage_class = declspecs->storage_class;
9504 if (storage_class == sc_static)
9505 staticp = 1 + (decl_context == FIELD);
9507 if (virtualp && staticp == 2)
9509 error ("member %qD cannot be declared both virtual and static", dname);
9510 storage_class = sc_none;
9513 friendp = decl_spec_seq_has_spec_p (declspecs, ds_friend);
9515 /* Issue errors about use of storage classes for parameters. */
9516 if (decl_context == PARM)
9520 error ("typedef declaration invalid in parameter declaration");
9521 return error_mark_node;
9523 else if (template_parm_flag && storage_class != sc_none)
9525 error ("storage class specified for template parameter %qs", name);
9526 return error_mark_node;
9528 else if (storage_class == sc_static
9529 || storage_class == sc_extern
9531 error ("storage class specifiers invalid in parameter declarations");
9533 /* Function parameters cannot be constexpr. If we saw one, moan
9534 and pretend it wasn't there. */
9537 error ("a parameter cannot be declared %<constexpr%>");
9542 /* Give error if `virtual' is used outside of class declaration. */
9544 && (current_class_name == NULL_TREE || decl_context != FIELD))
9546 error ("%<virtual%> outside class declaration");
9550 /* Static anonymous unions are dealt with here. */
9551 if (staticp && decl_context == TYPENAME
9553 && ANON_AGGR_TYPE_P (declspecs->type))
9554 decl_context = FIELD;
9556 /* Warn about storage classes that are invalid for certain
9557 kinds of declarations (parameters, typenames, etc.). */
9560 && storage_class != sc_extern
9561 && storage_class != sc_static)
9564 error ("multiple storage classes in declaration of %qs", name);
9567 if (decl_context != NORMAL
9568 && ((storage_class != sc_none
9569 && storage_class != sc_mutable)
9572 if ((decl_context == PARM || decl_context == CATCHPARM)
9573 && (storage_class == sc_register
9574 || storage_class == sc_auto))
9578 else if (decl_context == FIELD
9579 /* C++ allows static class elements. */
9580 && storage_class == sc_static)
9581 /* C++ also allows inlines and signed and unsigned elements,
9582 but in those cases we don't come in here. */
9586 if (decl_context == FIELD)
9587 error ("storage class specified for %qs", name);
9590 if (decl_context == PARM || decl_context == CATCHPARM)
9591 error ("storage class specified for parameter %qs", name);
9593 error ("storage class specified for typename");
9595 if (storage_class == sc_register
9596 || storage_class == sc_auto
9597 || storage_class == sc_extern
9599 storage_class = sc_none;
9602 else if (storage_class == sc_extern && funcdef_flag
9603 && ! toplevel_bindings_p ())
9604 error ("nested function %qs declared %<extern%>", name);
9605 else if (toplevel_bindings_p ())
9607 if (storage_class == sc_auto)
9608 error ("top-level declaration of %qs specifies %<auto%>", name);
9611 && storage_class != sc_extern
9612 && storage_class != sc_static)
9614 if (declspecs->gnu_thread_keyword_p)
9615 pedwarn (input_location, 0, "function-scope %qs implicitly auto and "
9616 "declared %<__thread%>", name);
9618 /* When thread_local is applied to a variable of block scope the
9619 storage-class-specifier static is implied if it does not appear
9621 storage_class = declspecs->storage_class = sc_static;
9625 if (storage_class && friendp)
9627 error ("storage class specifiers invalid in friend function declarations");
9628 storage_class = sc_none;
9633 unqualified_id = NULL_TREE;
9636 unqualified_id = id_declarator->u.id.unqualified_name;
9637 switch (TREE_CODE (unqualified_id))
9640 unqualified_id = TREE_OPERAND (unqualified_id, 0);
9641 if (TYPE_P (unqualified_id))
9642 unqualified_id = constructor_name (unqualified_id);
9645 case IDENTIFIER_NODE:
9646 case TEMPLATE_ID_EXPR:
9654 if (declspecs->std_attributes)
9656 /* Apply the c++11 attributes to the type preceding them. */
9657 input_location = declspecs->locations[ds_std_attribute];
9658 decl_attributes (&type, declspecs->std_attributes, 0);
9659 input_location = saved_loc;
9662 /* Determine the type of the entity declared by recurring on the
9664 for (; declarator; declarator = declarator->declarator)
9666 const cp_declarator *inner_declarator;
9669 if (type == error_mark_node)
9670 return error_mark_node;
9672 attrs = declarator->attributes;
9678 if (declarator == NULL || declarator->kind == cdk_id)
9679 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
9680 if (declarator->kind == cdk_function)
9681 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
9682 if (declarator->kind == cdk_array)
9683 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
9684 returned_attrs = decl_attributes (&type,
9685 chainon (returned_attrs, attrs),
9689 if (declarator->kind == cdk_id)
9692 inner_declarator = declarator->declarator;
9694 switch (declarator->kind)
9697 type = create_array_type_for_decl (dname, type,
9698 declarator->u.array.bounds);
9699 if (declarator->std_attributes)
9702 The optional attribute-specifier-seq appertains to the
9704 returned_attrs = chainon (returned_attrs,
9705 declarator->std_attributes);
9713 /* Declaring a function type.
9714 Make sure we have a valid type for the function to return. */
9716 if (type_quals != TYPE_UNQUALIFIED)
9718 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
9719 warning (OPT_Wignored_qualifiers,
9720 "type qualifiers ignored on function return type");
9721 /* We now know that the TYPE_QUALS don't apply to the
9722 decl, but to its return type. */
9723 type_quals = TYPE_UNQUALIFIED;
9725 errmsg = targetm.invalid_return_type (type);
9729 type = integer_type_node;
9732 /* Error about some types functions can't return. */
9734 if (TREE_CODE (type) == FUNCTION_TYPE)
9736 error ("%qs declared as function returning a function", name);
9737 return error_mark_node;
9739 if (TREE_CODE (type) == ARRAY_TYPE)
9741 error ("%qs declared as function returning an array", name);
9742 return error_mark_node;
9745 input_location = declspecs->locations[ds_type_spec];
9746 abstract_virtuals_error (ACU_RETURN, type);
9747 input_location = saved_loc;
9749 /* Pick up type qualifiers which should be applied to `this'. */
9750 memfn_quals = declarator->u.function.qualifiers;
9751 /* Pick up virt-specifiers. */
9752 virt_specifiers = declarator->u.function.virt_specifiers;
9753 /* And ref-qualifier, too */
9754 rqual = declarator->u.function.ref_qualifier;
9755 /* Pick up the exception specifications. */
9756 raises = declarator->u.function.exception_specification;
9757 /* If the exception-specification is ill-formed, let's pretend
9758 there wasn't one. */
9759 if (raises == error_mark_node)
9762 /* Say it's a definition only for the CALL_EXPR
9763 closest to the identifier. */
9764 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
9766 /* Handle a late-specified return type. */
9769 if (type_uses_auto (type))
9771 if (!declarator->u.function.late_return_type)
9773 if (current_class_type
9774 && LAMBDA_TYPE_P (current_class_type))
9775 /* OK for C++11 lambdas. */;
9776 else if (cxx_dialect < cxx14)
9778 error ("%qs function uses "
9779 "%<auto%> type specifier without trailing "
9780 "return type", name);
9781 inform (input_location, "deduced return type "
9782 "only available with -std=c++14 or "
9787 error ("virtual function cannot "
9788 "have deduced return type");
9792 else if (!is_auto (type))
9794 error ("%qs function with trailing return type has"
9795 " %qT as its type rather than plain %<auto%>",
9797 return error_mark_node;
9800 else if (declarator->u.function.late_return_type)
9802 if (cxx_dialect < cxx11)
9803 /* Not using maybe_warn_cpp0x because this should
9804 always be an error. */
9805 error ("trailing return type only available with "
9806 "-std=c++11 or -std=gnu++11");
9808 error ("%qs function with trailing return type not "
9809 "declared with %<auto%> type specifier", name);
9810 return error_mark_node;
9813 type = splice_late_return_type
9814 (type, declarator->u.function.late_return_type);
9815 if (type == error_mark_node)
9816 return error_mark_node;
9818 if (declarator->u.function.late_return_type)
9819 late_return_type_p = true;
9821 if (ctype == NULL_TREE
9822 && decl_context == FIELD
9825 ctype = current_class_type;
9827 if (ctype && (sfk == sfk_constructor
9828 || sfk == sfk_destructor))
9830 /* We are within a class's scope. If our declarator name
9831 is the same as the class name, and we are defining
9832 a function, then it is a constructor/destructor, and
9833 therefore returns a void type. */
9835 /* ISO C++ 12.4/2. A destructor may not be declared
9836 const or volatile. A destructor may not be static.
9837 A destructor may not be declared with ref-qualifier.
9839 ISO C++ 12.1. A constructor may not be declared
9840 const or volatile. A constructor may not be
9841 virtual. A constructor may not be static.
9842 A constructor may not be declared with ref-qualifier. */
9844 error ((flags == DTOR_FLAG)
9845 ? G_("destructor cannot be static member function")
9846 : G_("constructor cannot be static member function"));
9849 error ((flags == DTOR_FLAG)
9850 ? G_("destructors may not be cv-qualified")
9851 : G_("constructors may not be cv-qualified"));
9852 memfn_quals = TYPE_UNQUALIFIED;
9857 maybe_warn_cpp0x (CPP0X_REF_QUALIFIER);
9858 error ((flags == DTOR_FLAG)
9859 ? "destructors may not be ref-qualified"
9860 : "constructors may not be ref-qualified");
9861 rqual = REF_QUAL_NONE;
9864 if (decl_context == FIELD
9865 && !member_function_or_else (ctype,
9868 return error_mark_node;
9870 if (flags != DTOR_FLAG)
9872 /* It's a constructor. */
9877 permerror (input_location, "constructors cannot be declared virtual");
9880 if (decl_context == FIELD
9881 && sfk != sfk_constructor)
9882 return error_mark_node;
9884 if (decl_context == FIELD)
9891 /* Cannot be both friend and virtual. */
9892 error ("virtual functions cannot be friends");
9895 if (decl_context == NORMAL)
9896 error ("friend declaration not in class definition");
9897 if (current_function_decl && funcdef_flag)
9898 error ("can%'t define friend function %qs in a local "
9902 else if (ctype && sfk == sfk_conversion)
9906 maybe_warn_cpp0x (CPP0X_EXPLICIT_CONVERSION);
9911 arg_types = grokparms (declarator->u.function.parameters,
9914 if (inner_declarator
9915 && inner_declarator->kind == cdk_id
9916 && inner_declarator->u.id.sfk == sfk_destructor
9917 && arg_types != void_list_node)
9919 error ("destructors may not have parameters");
9920 arg_types = void_list_node;
9924 type = build_function_type (type, arg_types);
9925 if (declarator->std_attributes)
9928 The optional attribute-specifier-seq appertains to
9929 the function type. */
9930 decl_attributes (&type, declarator->std_attributes,
9938 /* Filter out pointers-to-references and references-to-references.
9939 We can get these if a TYPE_DECL is used. */
9941 if (TREE_CODE (type) == REFERENCE_TYPE)
9943 if (declarator->kind != cdk_reference)
9945 error ("cannot declare pointer to %q#T", type);
9946 type = TREE_TYPE (type);
9949 /* In C++0x, we allow reference to reference declarations
9950 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
9951 and template type arguments [14.3.1/4 temp.arg.type]. The
9952 check for direct reference to reference declarations, which
9953 are still forbidden, occurs below. Reasoning behind the change
9954 can be found in DR106, DR540, and the rvalue reference
9956 else if (cxx_dialect == cxx98)
9958 error ("cannot declare reference to %q#T", type);
9959 type = TREE_TYPE (type);
9962 else if (VOID_TYPE_P (type))
9964 if (declarator->kind == cdk_reference)
9965 error ("cannot declare reference to %q#T", type);
9966 else if (declarator->kind == cdk_ptrmem)
9967 error ("cannot declare pointer to %q#T member", type);
9970 /* We now know that the TYPE_QUALS don't apply to the decl,
9971 but to the target of the pointer. */
9972 type_quals = TYPE_UNQUALIFIED;
9974 /* This code used to handle METHOD_TYPE, but I don't think it's
9975 possible to get it here anymore. */
9976 gcc_assert (TREE_CODE (type) != METHOD_TYPE);
9977 if (declarator->kind == cdk_ptrmem
9978 && TREE_CODE (type) == FUNCTION_TYPE)
9980 memfn_quals |= type_memfn_quals (type);
9981 type = build_memfn_type (type,
9982 declarator->u.pointer.class_type,
9985 if (type == error_mark_node)
9986 return error_mark_node;
9988 rqual = REF_QUAL_NONE;
9989 memfn_quals = TYPE_UNQUALIFIED;
9992 if (TREE_CODE (type) == FUNCTION_TYPE
9993 && (type_memfn_quals (type) != TYPE_UNQUALIFIED
9994 || type_memfn_rqual (type) != REF_QUAL_NONE))
9995 error (declarator->kind == cdk_reference
9996 ? G_("cannot declare reference to qualified function type %qT")
9997 : G_("cannot declare pointer to qualified function type %qT"),
10000 /* When the pointed-to type involves components of variable size,
10001 care must be taken to ensure that the size evaluation code is
10002 emitted early enough to dominate all the possible later uses
10003 and late enough for the variables on which it depends to have
10006 This is expected to happen automatically when the pointed-to
10007 type has a name/declaration of it's own, but special attention
10008 is required if the type is anonymous.
10010 We handle the NORMAL and FIELD contexts here by inserting a
10011 dummy statement that just evaluates the size at a safe point
10012 and ensures it is not deferred until e.g. within a deeper
10013 conditional context (c++/43555).
10015 We expect nothing to be needed here for PARM or TYPENAME.
10016 Evaluating the size at this point for TYPENAME would
10017 actually be incorrect, as we might be in the middle of an
10018 expression with side effects on the pointed-to type size
10019 "arguments" prior to the pointer declaration point and the
10020 size evaluation could end up prior to the side effects. */
10022 if (!TYPE_NAME (type)
10023 && (decl_context == NORMAL || decl_context == FIELD)
10024 && at_function_scope_p ()
10025 && variably_modified_type_p (type, NULL_TREE))
10026 /* Force evaluation of the SAVE_EXPR. */
10027 finish_expr_stmt (TYPE_SIZE (type));
10029 if (declarator->kind == cdk_reference)
10031 /* In C++0x, the type we are creating a reference to might be
10032 a typedef which is itself a reference type. In that case,
10033 we follow the reference collapsing rules in
10034 [7.1.3/8 dcl.typedef] to create the final reference type:
10036 "If a typedef TD names a type that is a reference to a type
10037 T, an attempt to create the type 'lvalue reference to cv TD'
10038 creates the type 'lvalue reference to T,' while an attempt
10039 to create the type "rvalue reference to cv TD' creates the
10042 if (VOID_TYPE_P (type))
10043 /* We already gave an error. */;
10044 else if (TREE_CODE (type) == REFERENCE_TYPE)
10046 if (declarator->u.reference.rvalue_ref)
10047 /* Leave type alone. */;
10049 type = cp_build_reference_type (TREE_TYPE (type), false);
10052 type = cp_build_reference_type
10053 (type, declarator->u.reference.rvalue_ref);
10055 /* In C++0x, we need this check for direct reference to
10056 reference declarations, which are forbidden by
10057 [8.3.2/5 dcl.ref]. Reference to reference declarations
10058 are only allowed indirectly through typedefs and template
10059 type arguments. Example:
10061 void foo(int & &); // invalid ref-to-ref decl
10063 typedef int & int_ref;
10064 void foo(int_ref &); // valid ref-to-ref decl
10066 if (inner_declarator && inner_declarator->kind == cdk_reference)
10067 error ("cannot declare reference to %q#T, which is not "
10068 "a typedef or a template type argument", type);
10070 else if (TREE_CODE (type) == METHOD_TYPE)
10071 type = build_ptrmemfunc_type (build_pointer_type (type));
10072 else if (declarator->kind == cdk_ptrmem)
10074 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
10075 != NAMESPACE_DECL);
10076 if (declarator->u.pointer.class_type == error_mark_node)
10077 /* We will already have complained. */
10078 type = error_mark_node;
10080 type = build_ptrmem_type (declarator->u.pointer.class_type,
10084 type = build_pointer_type (type);
10086 /* Process a list of type modifier keywords (such as
10087 const or volatile) that were given inside the `*' or `&'. */
10089 if (declarator->u.pointer.qualifiers)
10092 = cp_build_qualified_type (type,
10093 declarator->u.pointer.qualifiers);
10094 type_quals = cp_type_quals (type);
10097 /* Apply C++11 attributes to the pointer, and not to the
10098 type pointed to. This is unlike what is done for GNU
10099 attributes above. It is to comply with [dcl.ptr]/1:
10101 [the optional attribute-specifier-seq (7.6.1) appertains
10102 to the pointer and not to the object pointed to]. */
10103 if (declarator->std_attributes)
10104 decl_attributes (&type, declarator->std_attributes,
10114 gcc_unreachable ();
10118 /* A `constexpr' specifier used in an object declaration declares
10119 the object as `const'. */
10120 if (constexpr_p && innermost_code != cdk_function)
10122 /* DR1688 says that a `constexpr' specifier in combination with
10123 `volatile' is valid. */
10125 if (TREE_CODE (type) != REFERENCE_TYPE)
10127 type_quals |= TYPE_QUAL_CONST;
10128 type = cp_build_qualified_type (type, type_quals);
10132 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
10133 && TREE_CODE (type) != FUNCTION_TYPE
10134 && TREE_CODE (type) != METHOD_TYPE
10135 && !variable_template_p (TREE_OPERAND (unqualified_id, 0)))
10137 error ("template-id %qD used as a declarator",
10139 unqualified_id = dname;
10142 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
10143 qualified with a class-name, turn it into a METHOD_TYPE, unless
10144 we know that the function is static. We take advantage of this
10145 opportunity to do other processing that pertains to entities
10146 explicitly declared to be class members. Note that if DECLARATOR
10147 is non-NULL, we know it is a cdk_id declarator; otherwise, we
10148 would not have exited the loop above. */
10150 && declarator->u.id.qualifying_scope
10151 && MAYBE_CLASS_TYPE_P (declarator->u.id.qualifying_scope))
10153 ctype = declarator->u.id.qualifying_scope;
10154 ctype = TYPE_MAIN_VARIANT (ctype);
10155 template_count = num_template_headers_for_class (ctype);
10157 if (ctype == current_class_type)
10161 permerror (input_location, "member functions are implicitly friends of their class");
10165 permerror (declarator->id_loc,
10166 "extra qualification %<%T::%> on member %qs",
10169 else if (/* If the qualifying type is already complete, then we
10170 can skip the following checks. */
10171 !COMPLETE_TYPE_P (ctype)
10172 && (/* If the function is being defined, then
10173 qualifying type must certainly be complete. */
10175 /* A friend declaration of "T::f" is OK, even if
10176 "T" is a template parameter. But, if this
10177 function is not a friend, the qualifying type
10178 must be a class. */
10179 || (!friendp && !CLASS_TYPE_P (ctype))
10180 /* For a declaration, the type need not be
10181 complete, if either it is dependent (since there
10182 is no meaningful definition of complete in that
10183 case) or the qualifying class is currently being
10185 || !(dependent_type_p (ctype)
10186 || currently_open_class (ctype)))
10187 /* Check that the qualifying type is complete. */
10188 && !complete_type_or_else (ctype, NULL_TREE))
10189 return error_mark_node;
10190 else if (TREE_CODE (type) == FUNCTION_TYPE)
10192 if (current_class_type
10193 && (!friendp || funcdef_flag))
10195 error (funcdef_flag
10196 ? G_("cannot define member function %<%T::%s%> "
10198 : G_("cannot declare member function %<%T::%s%> "
10200 ctype, name, current_class_type);
10201 return error_mark_node;
10204 else if (typedef_p && current_class_type)
10206 error ("cannot declare member %<%T::%s%> within %qT",
10207 ctype, name, current_class_type);
10208 return error_mark_node;
10212 if (ctype == NULL_TREE && decl_context == FIELD && friendp == 0)
10213 ctype = current_class_type;
10215 /* Now TYPE has the actual type. */
10217 if (returned_attrs)
10220 *attrlist = chainon (returned_attrs, *attrlist);
10222 attrlist = &returned_attrs;
10226 && declarator->kind == cdk_id
10227 && declarator->std_attributes)
10228 /* [dcl.meaning]/1: The optional attribute-specifier-seq following
10229 a declarator-id appertains to the entity that is declared. */
10230 *attrlist = chainon (*attrlist, declarator->std_attributes);
10232 /* Handle parameter packs. */
10233 if (parameter_pack_p)
10235 if (decl_context == PARM)
10236 /* Turn the type into a pack expansion.*/
10237 type = make_pack_expansion (type);
10239 error ("non-parameter %qs cannot be a parameter pack", name);
10242 /* Did array size calculations overflow or does the array cover more
10243 than half of the address-space? */
10244 if (TREE_CODE (type) == ARRAY_TYPE
10245 && COMPLETE_TYPE_P (type)
10246 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
10247 && ! valid_constant_size_p (TYPE_SIZE_UNIT (type)))
10249 error ("size of array %qs is too large", name);
10250 /* If we proceed with the array type as it is, we'll eventually
10251 crash in tree_to_[su]hwi(). */
10252 type = error_mark_node;
10255 if ((decl_context == FIELD || decl_context == PARM)
10256 && !processing_template_decl
10257 && variably_modified_type_p (type, NULL_TREE))
10259 if (decl_context == FIELD)
10260 error ("data member may not have variably modified type %qT", type);
10262 error ("parameter may not have variably modified type %qT", type);
10263 type = error_mark_node;
10266 if (explicitp == 1 || (explicitp && friendp))
10268 /* [dcl.fct.spec] (C++11) The explicit specifier shall be used only
10269 in the declaration of a constructor or conversion function within
10270 a class definition. */
10271 if (!current_class_type)
10272 error ("%<explicit%> outside class declaration");
10274 error ("%<explicit%> in friend declaration");
10276 error ("only declarations of constructors and conversion operators "
10277 "can be %<explicit%>");
10281 if (storage_class == sc_mutable)
10283 if (decl_context != FIELD || friendp)
10285 error ("non-member %qs cannot be declared %<mutable%>", name);
10286 storage_class = sc_none;
10288 else if (decl_context == TYPENAME || typedef_p)
10290 error ("non-object member %qs cannot be declared %<mutable%>", name);
10291 storage_class = sc_none;
10293 else if (TREE_CODE (type) == FUNCTION_TYPE
10294 || TREE_CODE (type) == METHOD_TYPE)
10296 error ("function %qs cannot be declared %<mutable%>", name);
10297 storage_class = sc_none;
10301 error ("static %qs cannot be declared %<mutable%>", name);
10302 storage_class = sc_none;
10304 else if (type_quals & TYPE_QUAL_CONST)
10306 error ("const %qs cannot be declared %<mutable%>", name);
10307 storage_class = sc_none;
10309 else if (TREE_CODE (type) == REFERENCE_TYPE)
10311 permerror (input_location, "reference %qs cannot be declared "
10312 "%<mutable%>", name);
10313 storage_class = sc_none;
10317 /* If this is declaring a typedef name, return a TYPE_DECL. */
10318 if (typedef_p && decl_context != TYPENAME)
10322 /* Note that the grammar rejects storage classes
10323 in typenames, fields or parameters. */
10324 if (current_lang_name == lang_name_java)
10325 TYPE_FOR_JAVA (type) = 1;
10327 /* This declaration:
10329 typedef void f(int) const;
10331 declares a function type which is not a member of any
10332 particular class, but which is cv-qualified; for
10333 example "f S::*" declares a pointer to a const-qualified
10334 member function of S. We record the cv-qualification in the
10336 if ((rqual || memfn_quals) && TREE_CODE (type) == FUNCTION_TYPE)
10338 type = apply_memfn_quals (type, memfn_quals, rqual);
10340 /* We have now dealt with these qualifiers. */
10341 memfn_quals = TYPE_UNQUALIFIED;
10342 rqual = REF_QUAL_NONE;
10345 if (type_uses_auto (type))
10347 error ("typedef declared %<auto%>");
10348 type = error_mark_node;
10351 if (decl_context == FIELD)
10352 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
10354 decl = build_decl (input_location, TYPE_DECL, unqualified_id, type);
10355 if (id_declarator && declarator->u.id.qualifying_scope) {
10356 error_at (DECL_SOURCE_LOCATION (decl),
10357 "typedef name may not be a nested-name-specifier");
10358 TREE_TYPE (decl) = error_mark_node;
10361 if (decl_context != FIELD)
10363 if (!current_function_decl)
10364 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
10365 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
10366 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
10367 (current_function_decl)))
10368 /* The TYPE_DECL is "abstract" because there will be
10369 clones of this constructor/destructor, and there will
10370 be copies of this TYPE_DECL generated in those
10371 clones. The decloning optimization (for space) may
10372 revert this subsequently if it determines that
10373 the clones should share a common implementation. */
10374 DECL_ABSTRACT_P (decl) = true;
10376 else if (current_class_type
10377 && constructor_name_p (unqualified_id, current_class_type))
10378 permerror (input_location, "ISO C++ forbids nested type %qD with same name "
10379 "as enclosing class",
10382 /* If the user declares "typedef struct {...} foo" then the
10383 struct will have an anonymous name. Fill that name in now.
10384 Nothing can refer to it, so nothing needs know about the name
10386 if (type != error_mark_node
10388 && TYPE_NAME (type)
10389 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
10390 && TYPE_ANONYMOUS_P (type)
10391 && declspecs->type_definition_p
10392 && attributes_naming_typedef_ok (*attrlist)
10393 && cp_type_quals (type) == TYPE_UNQUALIFIED)
10397 /* Replace the anonymous name with the real name everywhere. */
10398 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
10400 if (ANON_AGGRNAME_P (TYPE_IDENTIFIER (t)))
10401 /* We do not rename the debug info representing the
10402 anonymous tagged type because the standard says in
10403 [dcl.typedef] that the naming applies only for
10404 linkage purposes. */
10405 /*debug_hooks->set_name (t, decl);*/
10406 TYPE_NAME (t) = decl;
10409 if (TYPE_LANG_SPECIFIC (type))
10410 TYPE_WAS_ANONYMOUS (type) = 1;
10412 /* If this is a typedef within a template class, the nested
10413 type is a (non-primary) template. The name for the
10414 template needs updating as well. */
10415 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
10416 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
10417 = TYPE_IDENTIFIER (type);
10419 /* Adjust linkage now that we aren't anonymous anymore. */
10420 reset_type_linkage (type);
10422 /* FIXME remangle member functions; member functions of a
10423 type with external linkage have external linkage. */
10427 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
10428 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
10430 bad_specifiers (decl, BSP_TYPE, virtualp,
10431 memfn_quals != TYPE_UNQUALIFIED,
10432 inlinep, friendp, raises != NULL_TREE);
10434 if (decl_spec_seq_has_spec_p (declspecs, ds_alias))
10435 /* Acknowledge that this was written:
10436 `using analias = atype;'. */
10437 TYPE_DECL_ALIAS_P (decl) = 1;
10442 /* Detect the case of an array type of unspecified size
10443 which came, as such, direct from a typedef name.
10444 We must copy the type, so that the array's domain can be
10445 individually set by the object's initializer. */
10447 if (type && typedef_type
10448 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
10449 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
10450 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
10452 /* Detect where we're using a typedef of function type to declare a
10453 function. PARMS will not be set, so we must create it now. */
10455 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
10457 tree decls = NULL_TREE;
10460 for (args = TYPE_ARG_TYPES (type);
10461 args && args != void_list_node;
10462 args = TREE_CHAIN (args))
10464 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
10466 DECL_CHAIN (decl) = decls;
10470 parms = nreverse (decls);
10472 if (decl_context != TYPENAME)
10474 /* The qualifiers on the function type become the qualifiers on
10475 the non-static member function. */
10476 memfn_quals |= type_memfn_quals (type);
10477 rqual = type_memfn_rqual (type);
10478 type_quals = TYPE_UNQUALIFIED;
10482 /* If this is a type name (such as, in a cast or sizeof),
10483 compute the type and return it now. */
10485 if (decl_context == TYPENAME)
10487 /* Note that the grammar rejects storage classes
10488 in typenames, fields or parameters. */
10489 if (type_quals != TYPE_UNQUALIFIED)
10490 type_quals = TYPE_UNQUALIFIED;
10492 /* Special case: "friend class foo" looks like a TYPENAME context. */
10495 if (type_quals != TYPE_UNQUALIFIED)
10497 error ("type qualifiers specified for friend class declaration");
10498 type_quals = TYPE_UNQUALIFIED;
10502 error ("%<inline%> specified for friend class declaration");
10508 /* Don't allow friend declaration without a class-key. */
10509 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
10510 permerror (input_location, "template parameters cannot be friends");
10511 else if (TREE_CODE (type) == TYPENAME_TYPE)
10512 permerror (input_location, "friend declaration requires class-key, "
10513 "i.e. %<friend class %T::%D%>",
10514 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
10516 permerror (input_location, "friend declaration requires class-key, "
10517 "i.e. %<friend %#T%>",
10521 /* Only try to do this stuff if we didn't already give up. */
10522 if (type != integer_type_node)
10524 /* A friendly class? */
10525 if (current_class_type)
10526 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
10527 /*complain=*/true);
10529 error ("trying to make class %qT a friend of global scope",
10532 type = void_type_node;
10535 else if (memfn_quals || rqual)
10537 if (ctype == NULL_TREE
10538 && TREE_CODE (type) == METHOD_TYPE)
10539 ctype = TYPE_METHOD_BASETYPE (type);
10542 type = build_memfn_type (type, ctype, memfn_quals, rqual);
10543 /* Core issue #547: need to allow this in template type args.
10544 Allow it in general in C++11 for alias-declarations. */
10545 else if ((template_type_arg || cxx_dialect >= cxx11)
10546 && TREE_CODE (type) == FUNCTION_TYPE)
10547 type = apply_memfn_quals (type, memfn_quals, rqual);
10549 error ("invalid qualifiers on non-member function type");
10554 else if (unqualified_id == NULL_TREE && decl_context != PARM
10555 && decl_context != CATCHPARM
10556 && TREE_CODE (type) != UNION_TYPE
10559 error ("abstract declarator %qT used as declaration", type);
10560 return error_mark_node;
10563 /* Only functions may be declared using an operator-function-id. */
10565 && IDENTIFIER_OPNAME_P (unqualified_id)
10566 && TREE_CODE (type) != FUNCTION_TYPE
10567 && TREE_CODE (type) != METHOD_TYPE)
10569 error ("declaration of %qD as non-function", unqualified_id);
10570 return error_mark_node;
10573 /* We don't check parameter types here because we can emit a better
10574 error message later. */
10575 if (decl_context != PARM)
10577 type = check_var_type (unqualified_id, type);
10578 if (type == error_mark_node)
10579 return error_mark_node;
10582 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
10583 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
10585 if (decl_context == PARM || decl_context == CATCHPARM)
10587 if (ctype || in_namespace)
10588 error ("cannot use %<::%> in parameter declaration");
10590 if (type_uses_auto (type))
10592 if (cxx_dialect >= cxx14)
10593 error ("%<auto%> parameter not permitted in this context");
10595 error ("parameter declared %<auto%>");
10596 type = error_mark_node;
10599 /* A parameter declared as an array of T is really a pointer to T.
10600 One declared as a function is really a pointer to a function.
10601 One declared as a member is really a pointer to member. */
10603 if (TREE_CODE (type) == ARRAY_TYPE)
10605 /* Transfer const-ness of array into that of type pointed to. */
10606 type = build_pointer_type (TREE_TYPE (type));
10607 type_quals = TYPE_UNQUALIFIED;
10608 array_parameter_p = true;
10610 else if (TREE_CODE (type) == FUNCTION_TYPE)
10611 type = build_pointer_type (type);
10614 if (ctype && TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
10615 && !NEW_DELETE_OPNAME_P (unqualified_id))
10617 cp_cv_quals real_quals = memfn_quals;
10618 if (cxx_dialect < cxx14 && constexpr_p
10619 && sfk != sfk_constructor && sfk != sfk_destructor)
10620 real_quals |= TYPE_QUAL_CONST;
10621 type = build_memfn_type (type, ctype, real_quals, rqual);
10627 if (decl_context == PARM)
10629 decl = cp_build_parm_decl (unqualified_id, type);
10630 DECL_ARRAY_PARAMETER_P (decl) = array_parameter_p;
10632 bad_specifiers (decl, BSP_PARM, virtualp,
10633 memfn_quals != TYPE_UNQUALIFIED,
10634 inlinep, friendp, raises != NULL_TREE);
10636 else if (decl_context == FIELD)
10638 if (!staticp && !friendp && TREE_CODE (type) != METHOD_TYPE
10639 && type_uses_auto (type))
10641 error ("non-static data member declared %<auto%>");
10642 type = error_mark_node;
10645 /* The C99 flexible array extension. */
10646 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
10647 && TYPE_DOMAIN (type) == NULL_TREE)
10649 tree itype = compute_array_index_type (dname, integer_zero_node,
10650 tf_warning_or_error);
10651 type = build_cplus_array_type (TREE_TYPE (type), itype);
10654 if (type == error_mark_node)
10656 /* Happens when declaring arrays of sizes which
10657 are error_mark_node, for example. */
10660 else if (in_namespace && !friendp)
10662 /* Something like struct S { int N::j; }; */
10663 error ("invalid use of %<::%>");
10664 return error_mark_node;
10666 else if (TREE_CODE (type) == FUNCTION_TYPE
10667 || TREE_CODE (type) == METHOD_TYPE)
10670 tree function_context;
10674 /* This should never happen in pure C++ (the check
10675 could be an assert). It could happen in
10676 Objective-C++ if someone writes invalid code that
10677 uses a function declaration for an instance
10678 variable or property (instance variables and
10679 properties are parsed as FIELD_DECLs, but they are
10680 part of an Objective-C class, not a C++ class).
10681 That code is invalid and is caught by this
10685 error ("declaration of function %qD in invalid context",
10687 return error_mark_node;
10690 /* ``A union may [ ... ] not [ have ] virtual functions.''
10692 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
10694 error ("function %qD declared virtual inside a union",
10696 return error_mark_node;
10699 if (NEW_DELETE_OPNAME_P (unqualified_id))
10703 error ("%qD cannot be declared virtual, since it "
10704 "is always static",
10711 /* Check that the name used for a destructor makes sense. */
10712 if (sfk == sfk_destructor)
10714 tree uqname = id_declarator->u.id.unqualified_name;
10718 gcc_assert (friendp);
10719 error ("expected qualified name in friend declaration "
10720 "for destructor %qD", uqname);
10721 return error_mark_node;
10724 if (!check_dtor_name (ctype, TREE_OPERAND (uqname, 0)))
10726 error ("declaration of %qD as member of %qT",
10728 return error_mark_node;
10732 error ("a destructor cannot be %<constexpr%>");
10733 return error_mark_node;
10736 else if (sfk == sfk_constructor && friendp && !ctype)
10738 error ("expected qualified name in friend declaration "
10739 "for constructor %qD",
10740 id_declarator->u.id.unqualified_name);
10741 return error_mark_node;
10744 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
10746 tree tmpl = TREE_OPERAND (unqualified_id, 0);
10747 if (variable_template_p (tmpl))
10749 error ("specialization of variable template %qD "
10750 "declared as function", tmpl);
10751 inform (DECL_SOURCE_LOCATION (tmpl),
10752 "variable template declared here");
10753 return error_mark_node;
10757 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
10758 function_context = (ctype != NULL_TREE) ?
10759 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
10760 publicp = (! friendp || ! staticp)
10761 && function_context == NULL_TREE;
10763 if (late_return_type_p)
10764 TYPE_HAS_LATE_RETURN_TYPE (type) = 1;
10766 decl = grokfndecl (ctype, type,
10767 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
10768 ? unqualified_id : dname,
10771 virtualp, flags, memfn_quals, rqual, raises,
10772 friendp ? -1 : 0, friendp, publicp,
10773 inlinep | (2 * constexpr_p),
10774 initialized == SD_DELETED, sfk,
10775 funcdef_flag, template_count, in_namespace,
10776 attrlist, declarator->id_loc);
10777 decl = set_virt_specifiers (decl, virt_specifiers);
10778 if (decl == NULL_TREE)
10779 return error_mark_node;
10781 /* This clobbers the attrs stored in `decl' from `attrlist'. */
10782 /* The decl and setting of decl_attr is also turned off. */
10783 decl = build_decl_attribute_variant (decl, decl_attr);
10786 /* [class.conv.ctor]
10788 A constructor declared without the function-specifier
10789 explicit that can be called with a single parameter
10790 specifies a conversion from the type of its first
10791 parameter to the type of its class. Such a constructor
10792 is called a converting constructor. */
10793 if (explicitp == 2)
10794 DECL_NONCONVERTING_P (decl) = 1;
10796 else if (!staticp && !dependent_type_p (type)
10797 && !COMPLETE_TYPE_P (complete_type (type))
10798 && (TREE_CODE (type) != ARRAY_TYPE
10799 || !COMPLETE_TYPE_P (TREE_TYPE (type))
10800 || initialized == 0))
10802 if (unqualified_id)
10804 error ("field %qD has incomplete type %qT",
10805 unqualified_id, type);
10806 cxx_incomplete_type_inform (strip_array_types (type));
10809 error ("name %qT has incomplete type", type);
10811 type = error_mark_node;
10818 error ("%qE is neither function nor member function; "
10819 "cannot be declared friend", unqualified_id);
10827 /* Friends are treated specially. */
10828 if (ctype == current_class_type)
10829 ; /* We already issued a permerror. */
10830 else if (decl && DECL_NAME (decl))
10832 if (template_class_depth (current_class_type) == 0)
10834 decl = check_explicit_specialization
10835 (unqualified_id, decl, template_count,
10836 2 * funcdef_flag + 4);
10837 if (decl == error_mark_node)
10838 return error_mark_node;
10841 decl = do_friend (ctype, unqualified_id, decl,
10847 return error_mark_node;
10850 /* Structure field. It may not be a function, except for C++. */
10852 if (decl == NULL_TREE)
10856 /* C++ allows static class members. All other work
10857 for this is done by grokfield. */
10858 decl = build_lang_decl_loc (declarator
10859 ? declarator->id_loc
10861 VAR_DECL, unqualified_id, type);
10862 set_linkage_for_static_data_member (decl);
10863 /* Even if there is an in-class initialization, DECL
10864 is considered undefined until an out-of-class
10865 definition is provided. */
10866 DECL_EXTERNAL (decl) = 1;
10870 set_decl_tls_model (decl, decl_default_tls_model (decl));
10871 if (declspecs->gnu_thread_keyword_p)
10872 DECL_GNU_TLS_P (decl) = true;
10875 if (constexpr_p && !initialized)
10877 error ("constexpr static data member %qD must have an "
10878 "initializer", decl);
10879 constexpr_p = false;
10886 error ("non-static data member %qE declared %<constexpr%>",
10888 constexpr_p = false;
10890 decl = build_decl (input_location,
10891 FIELD_DECL, unqualified_id, type);
10892 DECL_NONADDRESSABLE_P (decl) = bitfield;
10893 if (bitfield && !unqualified_id)
10894 TREE_NO_WARNING (decl) = 1;
10896 if (storage_class == sc_mutable)
10898 DECL_MUTABLE_P (decl) = 1;
10899 storage_class = sc_none;
10904 /* An attempt is being made to initialize a non-static
10905 member. This is new in C++11. */
10906 maybe_warn_cpp0x (CPP0X_NSDMI);
10908 /* If this has been parsed with static storage class, but
10909 errors forced staticp to be cleared, ensure NSDMI is
10911 if (declspecs->storage_class == sc_static)
10912 DECL_INITIAL (decl) = error_mark_node;
10916 bad_specifiers (decl, BSP_FIELD, virtualp,
10917 memfn_quals != TYPE_UNQUALIFIED,
10918 inlinep, friendp, raises != NULL_TREE);
10921 else if (TREE_CODE (type) == FUNCTION_TYPE
10922 || TREE_CODE (type) == METHOD_TYPE)
10924 tree original_name;
10927 if (!unqualified_id)
10928 return error_mark_node;
10930 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
10931 original_name = dname;
10933 original_name = unqualified_id;
10935 if (storage_class == sc_auto)
10936 error ("storage class %<auto%> invalid for function %qs", name);
10937 else if (storage_class == sc_register)
10938 error ("storage class %<register%> invalid for function %qs", name);
10941 if (declspecs->gnu_thread_keyword_p)
10942 error ("storage class %<__thread%> invalid for function %qs",
10945 error ("storage class %<thread_local%> invalid for function %qs",
10949 if (virt_specifiers)
10950 error ("virt-specifiers in %qs not allowed outside a class definition", name);
10951 /* Function declaration not at top level.
10952 Storage classes other than `extern' are not allowed
10953 and `extern' makes no difference. */
10954 if (! toplevel_bindings_p ()
10955 && (storage_class == sc_static
10956 || decl_spec_seq_has_spec_p (declspecs, ds_inline))
10959 if (storage_class == sc_static)
10960 pedwarn (input_location, OPT_Wpedantic,
10961 "%<static%> specified invalid for function %qs "
10962 "declared out of global scope", name);
10964 pedwarn (input_location, OPT_Wpedantic,
10965 "%<inline%> specifier invalid for function %qs "
10966 "declared out of global scope", name);
10969 if (ctype == NULL_TREE)
10973 error ("virtual non-class function %qs", name);
10976 else if (sfk == sfk_constructor
10977 || sfk == sfk_destructor)
10979 error (funcdef_flag
10980 ? G_("%qs defined in a non-class scope")
10981 : G_("%qs declared in a non-class scope"), name);
10986 /* Record whether the function is public. */
10987 publicp = (ctype != NULL_TREE
10988 || storage_class != sc_static);
10990 if (late_return_type_p)
10991 TYPE_HAS_LATE_RETURN_TYPE (type) = 1;
10993 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
10994 virtualp, flags, memfn_quals, rqual, raises,
10996 publicp, inlinep | (2 * constexpr_p),
10997 initialized == SD_DELETED, sfk,
10999 template_count, in_namespace, attrlist,
11000 declarator->id_loc);
11001 if (decl == NULL_TREE)
11002 return error_mark_node;
11006 int invalid_static = 0;
11008 /* Don't allow a static member function in a class, and forbid
11009 declaring main to be static. */
11010 if (TREE_CODE (type) == METHOD_TYPE)
11012 permerror (input_location, "cannot declare member function %qD to have "
11013 "static linkage", decl);
11014 invalid_static = 1;
11016 else if (current_function_decl)
11018 /* FIXME need arm citation */
11019 error ("cannot declare static function inside another function");
11020 invalid_static = 1;
11023 if (invalid_static)
11026 storage_class = sc_none;
11032 /* It's a variable. */
11034 /* An uninitialized decl with `extern' is a reference. */
11035 decl = grokvardecl (type, dname, unqualified_id,
11038 (type_quals & TYPE_QUAL_CONST) != 0,
11040 ctype ? ctype : in_namespace);
11041 if (decl == NULL_TREE)
11042 return error_mark_node;
11044 bad_specifiers (decl, BSP_VAR, virtualp,
11045 memfn_quals != TYPE_UNQUALIFIED,
11046 inlinep, friendp, raises != NULL_TREE);
11050 DECL_CONTEXT (decl) = ctype;
11053 permerror (input_location, "%<static%> may not be used when defining "
11054 "(as opposed to declaring) a static data member");
11056 storage_class = sc_none;
11058 if (storage_class == sc_register && TREE_STATIC (decl))
11060 error ("static member %qD declared %<register%>", decl);
11061 storage_class = sc_none;
11063 if (storage_class == sc_extern && pedantic)
11065 pedwarn (input_location, OPT_Wpedantic,
11066 "cannot explicitly declare member %q#D to have "
11067 "extern linkage", decl);
11068 storage_class = sc_none;
11071 else if (constexpr_p && DECL_EXTERNAL (decl))
11073 error ("declaration of constexpr variable %qD is not a definition",
11075 constexpr_p = false;
11079 if (storage_class == sc_extern && initialized && !funcdef_flag)
11081 if (toplevel_bindings_p ())
11083 /* It's common practice (and completely valid) to have a const
11084 be initialized and declared extern. */
11085 if (!(type_quals & TYPE_QUAL_CONST))
11086 warning (0, "%qs initialized and declared %<extern%>", name);
11090 error ("%qs has both %<extern%> and initializer", name);
11091 return error_mark_node;
11095 /* Record `register' declaration for warnings on &
11096 and in case doing stupid register allocation. */
11098 if (storage_class == sc_register)
11099 DECL_REGISTER (decl) = 1;
11100 else if (storage_class == sc_extern)
11101 DECL_THIS_EXTERN (decl) = 1;
11102 else if (storage_class == sc_static)
11103 DECL_THIS_STATIC (decl) = 1;
11105 /* Set constexpr flag on vars (functions got it in grokfndecl). */
11106 if (constexpr_p && VAR_P (decl))
11107 DECL_DECLARED_CONSTEXPR_P (decl) = true;
11109 /* Record constancy and volatility on the DECL itself . There's
11110 no need to do this when processing a template; we'll do this
11111 for the instantiated declaration based on the type of DECL. */
11112 if (!processing_template_decl)
11113 cp_apply_type_quals_to_decl (type_quals, decl);
11119 /* Subroutine of start_function. Ensure that each of the parameter
11120 types (as listed in PARMS) is complete, as is required for a
11121 function definition. */
11124 require_complete_types_for_parms (tree parms)
11126 for (; parms; parms = DECL_CHAIN (parms))
11128 if (dependent_type_p (TREE_TYPE (parms)))
11130 if (!VOID_TYPE_P (TREE_TYPE (parms))
11131 && complete_type_or_else (TREE_TYPE (parms), parms))
11133 relayout_decl (parms);
11134 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
11137 /* grokparms or complete_type_or_else will have already issued
11139 TREE_TYPE (parms) = error_mark_node;
11143 /* Returns nonzero if T is a local variable. */
11146 local_variable_p (const_tree t)
11149 /* A VAR_DECL with a context that is a _TYPE is a static data
11151 && !TYPE_P (CP_DECL_CONTEXT (t))
11152 /* Any other non-local variable must be at namespace scope. */
11153 && !DECL_NAMESPACE_SCOPE_P (t))
11154 || (TREE_CODE (t) == PARM_DECL))
11160 /* Like local_variable_p, but suitable for use as a tree-walking
11164 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
11167 if (local_variable_p (*tp)
11168 && (!DECL_ARTIFICIAL (*tp) || DECL_NAME (*tp) == this_identifier))
11170 else if (TYPE_P (*tp))
11171 *walk_subtrees = 0;
11176 /* Check that ARG, which is a default-argument expression for a
11177 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
11178 something goes wrong. DECL may also be a _TYPE node, rather than a
11179 DECL, if there is no DECL available. */
11182 check_default_argument (tree decl, tree arg, tsubst_flags_t complain)
11187 if (TREE_CODE (arg) == DEFAULT_ARG)
11188 /* We get a DEFAULT_ARG when looking at an in-class declaration
11189 with a default argument. Ignore the argument for now; we'll
11190 deal with it after the class is complete. */
11199 decl_type = TREE_TYPE (decl);
11201 if (arg == error_mark_node
11202 || decl == error_mark_node
11203 || TREE_TYPE (arg) == error_mark_node
11204 || decl_type == error_mark_node)
11205 /* Something already went wrong. There's no need to check
11207 return error_mark_node;
11209 /* [dcl.fct.default]
11211 A default argument expression is implicitly converted to the
11213 ++cp_unevaluated_operand;
11214 perform_implicit_conversion_flags (decl_type, arg, complain,
11216 --cp_unevaluated_operand;
11218 /* Avoid redundant -Wzero-as-null-pointer-constant warnings at
11220 if (TYPE_PTR_OR_PTRMEM_P (decl_type)
11221 && null_ptr_cst_p (arg))
11222 return nullptr_node;
11224 /* [dcl.fct.default]
11226 Local variables shall not be used in default argument
11229 The keyword `this' shall not be used in a default argument of a
11230 member function. */
11231 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
11234 if (complain & tf_warning_or_error)
11236 if (DECL_NAME (var) == this_identifier)
11237 permerror (input_location, "default argument %qE uses %qD",
11240 error ("default argument %qE uses local variable %qD", arg, var);
11242 return error_mark_node;
11249 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
11252 type_is_deprecated (tree type)
11254 enum tree_code code;
11255 if (TREE_DEPRECATED (type))
11257 if (TYPE_NAME (type)
11258 && TREE_DEPRECATED (TYPE_NAME (type)))
11261 /* Do warn about using typedefs to a deprecated class. */
11262 if (OVERLOAD_TYPE_P (type) && type != TYPE_MAIN_VARIANT (type))
11263 return type_is_deprecated (TYPE_MAIN_VARIANT (type));
11265 code = TREE_CODE (type);
11267 if (code == POINTER_TYPE || code == REFERENCE_TYPE
11268 || code == OFFSET_TYPE || code == FUNCTION_TYPE
11269 || code == METHOD_TYPE || code == ARRAY_TYPE)
11270 return type_is_deprecated (TREE_TYPE (type));
11272 if (TYPE_PTRMEMFUNC_P (type))
11273 return type_is_deprecated
11274 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type))));
11279 /* Decode the list of parameter types for a function type.
11280 Given the list of things declared inside the parens,
11281 return a list of types.
11283 If this parameter does not end with an ellipsis, we append
11286 *PARMS is set to the chain of PARM_DECLs created. */
11289 grokparms (tree parmlist, tree *parms)
11291 tree result = NULL_TREE;
11292 tree decls = NULL_TREE;
11296 for (parm = parmlist; parm != NULL_TREE; parm = TREE_CHAIN (parm))
11298 tree type = NULL_TREE;
11299 tree init = TREE_PURPOSE (parm);
11300 tree decl = TREE_VALUE (parm);
11301 const char *errmsg;
11303 if (parm == void_list_node)
11306 if (! decl || TREE_TYPE (decl) == error_mark_node)
11309 type = TREE_TYPE (decl);
11310 if (VOID_TYPE_P (type))
11312 if (same_type_p (type, void_type_node)
11314 && !DECL_NAME (decl) && !result
11315 && TREE_CHAIN (parm) == void_list_node)
11316 /* DR 577: A parameter list consisting of a single
11317 unnamed parameter of non-dependent type 'void'. */
11319 else if (cv_qualified_p (type))
11320 error_at (DECL_SOURCE_LOCATION (decl),
11321 "invalid use of cv-qualified type %qT in "
11322 "parameter declaration", type);
11324 error_at (DECL_SOURCE_LOCATION (decl),
11325 "invalid use of type %<void%> in parameter "
11327 /* It's not a good idea to actually create parameters of
11328 type `void'; other parts of the compiler assume that a
11329 void type terminates the parameter list. */
11330 type = error_mark_node;
11331 TREE_TYPE (decl) = error_mark_node;
11334 if (type != error_mark_node
11335 && TYPE_FOR_JAVA (type)
11336 && MAYBE_CLASS_TYPE_P (type))
11338 error ("parameter %qD has Java class type", decl);
11339 type = error_mark_node;
11340 TREE_TYPE (decl) = error_mark_node;
11344 if (type != error_mark_node
11345 && (errmsg = targetm.invalid_parameter_type (type)))
11348 type = error_mark_node;
11349 TREE_TYPE (decl) = error_mark_node;
11352 if (type != error_mark_node)
11354 if (deprecated_state != DEPRECATED_SUPPRESS)
11356 tree deptype = type_is_deprecated (type);
11358 warn_deprecated_use (deptype, NULL_TREE);
11361 /* Top-level qualifiers on the parameters are
11362 ignored for function types. */
11363 type = cp_build_qualified_type (type, 0);
11364 if (TREE_CODE (type) == METHOD_TYPE)
11366 error ("parameter %qD invalidly declared method type", decl);
11367 type = build_pointer_type (type);
11368 TREE_TYPE (decl) = type;
11370 else if (abstract_virtuals_error (decl, type))
11371 any_error = 1; /* Seems like a good idea. */
11372 else if (POINTER_TYPE_P (type))
11374 /* [dcl.fct]/6, parameter types cannot contain pointers
11375 (references) to arrays of unknown bound. */
11376 tree t = TREE_TYPE (type);
11377 int ptr = TYPE_PTR_P (type);
11381 if (TYPE_PTR_P (t))
11383 else if (TREE_CODE (t) != ARRAY_TYPE)
11385 else if (!TYPE_DOMAIN (t))
11389 if (TREE_CODE (t) == ARRAY_TYPE)
11391 ? G_("parameter %qD includes pointer to array of "
11392 "unknown bound %qT")
11393 : G_("parameter %qD includes reference to array of "
11394 "unknown bound %qT"),
11400 else if (init && !processing_template_decl)
11401 init = check_default_argument (decl, init, tf_warning_or_error);
11404 DECL_CHAIN (decl) = decls;
11406 result = tree_cons (init, type, result);
11408 decls = nreverse (decls);
11409 result = nreverse (result);
11411 result = chainon (result, void_list_node);
11418 /* D is a constructor or overloaded `operator='.
11420 Let T be the class in which D is declared. Then, this function
11423 -1 if D's is an ill-formed constructor or copy assignment operator
11424 whose first parameter is of type `T'.
11425 0 if D is not a copy constructor or copy assignment
11427 1 if D is a copy constructor or copy assignment operator whose
11428 first parameter is a reference to non-const qualified T.
11429 2 if D is a copy constructor or copy assignment operator whose
11430 first parameter is a reference to const qualified T.
11432 This function can be used as a predicate. Positive values indicate
11433 a copy constructor and nonzero values indicate a copy assignment
11437 copy_fn_p (const_tree d)
11443 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
11445 if (TREE_CODE (d) == TEMPLATE_DECL
11446 || (DECL_TEMPLATE_INFO (d)
11447 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
11448 /* Instantiations of template member functions are never copy
11449 functions. Note that member functions of templated classes are
11450 represented as template functions internally, and we must
11451 accept those as copy functions. */
11454 args = FUNCTION_FIRST_USER_PARMTYPE (d);
11458 arg_type = TREE_VALUE (args);
11459 if (arg_type == error_mark_node)
11462 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
11464 /* Pass by value copy assignment operator. */
11467 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
11468 && !TYPE_REF_IS_RVALUE (arg_type)
11469 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
11471 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
11477 args = TREE_CHAIN (args);
11479 if (args && args != void_list_node && !TREE_PURPOSE (args))
11480 /* There are more non-optional args. */
11486 /* D is a constructor or overloaded `operator='.
11488 Let T be the class in which D is declared. Then, this function
11489 returns true when D is a move constructor or move assignment
11490 operator, false otherwise. */
11493 move_fn_p (const_tree d)
11495 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
11497 if (cxx_dialect == cxx98)
11498 /* There are no move constructors if we are in C++98 mode. */
11501 if (TREE_CODE (d) == TEMPLATE_DECL
11502 || (DECL_TEMPLATE_INFO (d)
11503 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
11504 /* Instantiations of template member functions are never move
11505 functions. Note that member functions of templated classes are
11506 represented as template functions internally, and we must
11507 accept those as move functions. */
11510 return move_signature_fn_p (d);
11513 /* D is a constructor or overloaded `operator='.
11515 Then, this function returns true when D has the same signature as a move
11516 constructor or move assignment operator (because either it is such a
11517 ctor/op= or it is a template specialization with the same signature),
11518 false otherwise. */
11521 move_signature_fn_p (const_tree d)
11525 bool result = false;
11527 args = FUNCTION_FIRST_USER_PARMTYPE (d);
11531 arg_type = TREE_VALUE (args);
11532 if (arg_type == error_mark_node)
11535 if (TREE_CODE (arg_type) == REFERENCE_TYPE
11536 && TYPE_REF_IS_RVALUE (arg_type)
11537 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
11541 args = TREE_CHAIN (args);
11543 if (args && args != void_list_node && !TREE_PURPOSE (args))
11544 /* There are more non-optional args. */
11550 /* Remember any special properties of member function DECL. */
11553 grok_special_member_properties (tree decl)
11557 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
11560 class_type = DECL_CONTEXT (decl);
11561 if (DECL_CONSTRUCTOR_P (decl))
11563 int ctor = copy_fn_p (decl);
11565 if (!DECL_ARTIFICIAL (decl))
11566 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
11572 A non-template constructor for class X is a copy
11573 constructor if its first parameter is of type X&, const
11574 X&, volatile X& or const volatile X&, and either there
11575 are no other parameters or else all other parameters have
11576 default arguments. */
11577 TYPE_HAS_COPY_CTOR (class_type) = 1;
11578 if (user_provided_p (decl))
11579 TYPE_HAS_COMPLEX_COPY_CTOR (class_type) = 1;
11581 TYPE_HAS_CONST_COPY_CTOR (class_type) = 1;
11583 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
11584 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
11585 else if (move_fn_p (decl) && user_provided_p (decl))
11586 TYPE_HAS_COMPLEX_MOVE_CTOR (class_type) = 1;
11587 else if (is_list_ctor (decl))
11588 TYPE_HAS_LIST_CTOR (class_type) = 1;
11590 if (DECL_DECLARED_CONSTEXPR_P (decl)
11591 && !copy_fn_p (decl) && !move_fn_p (decl))
11592 TYPE_HAS_CONSTEXPR_CTOR (class_type) = 1;
11594 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
11598 A non-template assignment operator for class X is a copy
11599 assignment operator if its parameter is of type X, X&, const
11600 X&, volatile X& or const volatile X&. */
11602 int assop = copy_fn_p (decl);
11606 TYPE_HAS_COPY_ASSIGN (class_type) = 1;
11607 if (user_provided_p (decl))
11608 TYPE_HAS_COMPLEX_COPY_ASSIGN (class_type) = 1;
11610 TYPE_HAS_CONST_COPY_ASSIGN (class_type) = 1;
11612 else if (move_fn_p (decl) && user_provided_p (decl))
11613 TYPE_HAS_COMPLEX_MOVE_ASSIGN (class_type) = 1;
11615 /* Destructors are handled in check_methods. */
11618 /* Check a constructor DECL has the correct form. Complains
11619 if the class has a constructor of the form X(X). */
11622 grok_ctor_properties (const_tree ctype, const_tree decl)
11624 int ctor_parm = copy_fn_p (decl);
11630 A declaration of a constructor for a class X is ill-formed if
11631 its first parameter is of type (optionally cv-qualified) X
11632 and either there are no other parameters or else all other
11633 parameters have default arguments.
11635 We *don't* complain about member template instantiations that
11636 have this form, though; they can occur as we try to decide
11637 what constructor to use during overload resolution. Since
11638 overload resolution will never prefer such a constructor to
11639 the non-template copy constructor (which is either explicitly
11640 or implicitly defined), there's no need to worry about their
11641 existence. Theoretically, they should never even be
11642 instantiated, but that's hard to forestall. */
11643 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
11651 /* An operator with this code is unary, but can also be binary. */
11654 ambi_op_p (enum tree_code code)
11656 return (code == INDIRECT_REF
11657 || code == ADDR_EXPR
11658 || code == UNARY_PLUS_EXPR
11659 || code == NEGATE_EXPR
11660 || code == PREINCREMENT_EXPR
11661 || code == PREDECREMENT_EXPR);
11664 /* An operator with this name can only be unary. */
11667 unary_op_p (enum tree_code code)
11669 return (code == TRUTH_NOT_EXPR
11670 || code == BIT_NOT_EXPR
11671 || code == COMPONENT_REF
11672 || code == TYPE_EXPR);
11675 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
11676 errors are issued for invalid declarations. */
11679 grok_op_properties (tree decl, bool complain)
11681 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
11683 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
11684 tree name = DECL_NAME (decl);
11685 enum tree_code operator_code;
11690 /* Count the number of arguments and check for ellipsis. */
11691 for (argtype = argtypes, arity = 0;
11692 argtype && argtype != void_list_node;
11693 argtype = TREE_CHAIN (argtype))
11695 ellipsis_p = !argtype;
11697 class_type = DECL_CONTEXT (decl);
11698 if (class_type && !CLASS_TYPE_P (class_type))
11699 class_type = NULL_TREE;
11701 if (DECL_CONV_FN_P (decl))
11702 operator_code = TYPE_EXPR;
11706 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
11707 if (ansi_opname (CODE) == name) \
11709 operator_code = (CODE); \
11712 else if (ansi_assopname (CODE) == name) \
11714 operator_code = (CODE); \
11715 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
11719 #include "operators.def"
11720 #undef DEF_OPERATOR
11722 gcc_unreachable ();
11725 gcc_assert (operator_code != MAX_TREE_CODES);
11726 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
11729 switch (operator_code)
11732 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
11736 TYPE_GETS_DELETE (class_type) |= 1;
11740 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
11743 case VEC_DELETE_EXPR:
11744 TYPE_GETS_DELETE (class_type) |= 2;
11751 /* [basic.std.dynamic.allocation]/1:
11753 A program is ill-formed if an allocation function is declared
11754 in a namespace scope other than global scope or declared static
11757 The same also holds true for deallocation functions. */
11758 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
11759 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
11761 if (DECL_NAMESPACE_SCOPE_P (decl))
11763 if (CP_DECL_CONTEXT (decl) != global_namespace)
11765 error ("%qD may not be declared within a namespace", decl);
11768 else if (!TREE_PUBLIC (decl))
11770 error ("%qD may not be declared as static", decl);
11773 if (!flag_sized_deallocation && warn_cxx14_compat)
11775 tree parm = FUNCTION_ARG_CHAIN (decl);
11776 if (parm && same_type_p (TREE_VALUE (parm), size_type_node)
11777 && TREE_CHAIN (parm) == void_list_node)
11778 warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wc__14_compat,
11779 "%qD is a usual (non-placement) deallocation "
11780 "function in C++14 (or with -fsized-deallocation)",
11786 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
11788 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
11789 DECL_IS_OPERATOR_NEW (decl) = 1;
11791 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
11792 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
11795 /* An operator function must either be a non-static member function
11796 or have at least one parameter of a class, a reference to a class,
11797 an enumeration, or a reference to an enumeration. 13.4.0.6 */
11798 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
11800 if (operator_code == TYPE_EXPR
11801 || operator_code == CALL_EXPR
11802 || operator_code == COMPONENT_REF
11803 || operator_code == ARRAY_REF
11804 || operator_code == NOP_EXPR)
11806 error ("%qD must be a nonstatic member function", decl);
11813 if (DECL_STATIC_FUNCTION_P (decl))
11815 error ("%qD must be either a non-static member "
11816 "function or a non-member function", decl);
11820 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
11822 tree arg = non_reference (TREE_VALUE (p));
11823 if (arg == error_mark_node)
11826 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
11827 because these checks are performed even on
11828 template functions. */
11829 if (MAYBE_CLASS_TYPE_P (arg)
11830 || TREE_CODE (arg) == ENUMERAL_TYPE)
11834 if (!p || p == void_list_node)
11837 error ("%qD must have an argument of class or "
11838 "enumerated type", decl);
11844 /* There are no restrictions on the arguments to an overloaded
11846 if (operator_code == CALL_EXPR)
11849 /* Warn about conversion operators that will never be used. */
11850 if (IDENTIFIER_TYPENAME_P (name)
11851 && ! DECL_TEMPLATE_INFO (decl)
11853 /* Warn only declaring the function; there is no need to
11854 warn again about out-of-class definitions. */
11855 && class_type == current_class_type)
11857 tree t = TREE_TYPE (name);
11858 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
11861 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
11863 if (VOID_TYPE_P (t))
11864 warning (OPT_Wconversion,
11866 ? G_("conversion to a reference to void "
11867 "will never use a type conversion operator")
11868 : G_("conversion to void "
11869 "will never use a type conversion operator"));
11870 else if (class_type)
11872 if (t == class_type)
11873 warning (OPT_Wconversion,
11875 ? G_("conversion to a reference to the same type "
11876 "will never use a type conversion operator")
11877 : G_("conversion to the same type "
11878 "will never use a type conversion operator"));
11879 /* Don't force t to be complete here. */
11880 else if (MAYBE_CLASS_TYPE_P (t)
11881 && COMPLETE_TYPE_P (t)
11882 && DERIVED_FROM_P (t, class_type))
11883 warning (OPT_Wconversion,
11885 ? G_("conversion to a reference to a base class "
11886 "will never use a type conversion operator")
11887 : G_("conversion to a base class "
11888 "will never use a type conversion operator"));
11893 if (operator_code == COND_EXPR)
11896 error ("ISO C++ prohibits overloading operator ?:");
11899 else if (ellipsis_p)
11901 error ("%qD must not have variable number of arguments", decl);
11904 else if (ambi_op_p (operator_code))
11907 /* We pick the one-argument operator codes by default, so
11908 we don't have to change anything. */
11910 else if (arity == 2)
11912 /* If we thought this was a unary operator, we now know
11913 it to be a binary operator. */
11914 switch (operator_code)
11917 operator_code = MULT_EXPR;
11921 operator_code = BIT_AND_EXPR;
11924 case UNARY_PLUS_EXPR:
11925 operator_code = PLUS_EXPR;
11929 operator_code = MINUS_EXPR;
11932 case PREINCREMENT_EXPR:
11933 operator_code = POSTINCREMENT_EXPR;
11936 case PREDECREMENT_EXPR:
11937 operator_code = POSTDECREMENT_EXPR;
11941 gcc_unreachable ();
11944 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
11946 if ((operator_code == POSTINCREMENT_EXPR
11947 || operator_code == POSTDECREMENT_EXPR)
11948 && ! processing_template_decl
11949 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
11952 error ("postfix %qD must take %<int%> as its argument",
11955 error ("postfix %qD must take %<int%> as its second "
11963 error ("%qD must take either zero or one argument", decl);
11965 error ("%qD must take either one or two arguments", decl);
11969 /* More Effective C++ rule 6. */
11971 && (operator_code == POSTINCREMENT_EXPR
11972 || operator_code == POSTDECREMENT_EXPR
11973 || operator_code == PREINCREMENT_EXPR
11974 || operator_code == PREDECREMENT_EXPR))
11976 tree arg = TREE_VALUE (argtypes);
11977 tree ret = TREE_TYPE (TREE_TYPE (decl));
11978 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
11979 arg = TREE_TYPE (arg);
11980 arg = TYPE_MAIN_VARIANT (arg);
11981 if (operator_code == PREINCREMENT_EXPR
11982 || operator_code == PREDECREMENT_EXPR)
11984 if (TREE_CODE (ret) != REFERENCE_TYPE
11985 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
11987 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
11988 build_reference_type (arg));
11992 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
11993 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
11997 else if (unary_op_p (operator_code))
12002 error ("%qD must take %<void%>", decl);
12004 error ("%qD must take exactly one argument", decl);
12008 else /* if (binary_op_p (operator_code)) */
12013 error ("%qD must take exactly one argument", decl);
12015 error ("%qD must take exactly two arguments", decl);
12019 /* More Effective C++ rule 7. */
12021 && (operator_code == TRUTH_ANDIF_EXPR
12022 || operator_code == TRUTH_ORIF_EXPR
12023 || operator_code == COMPOUND_EXPR))
12024 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
12028 /* Effective C++ rule 23. */
12031 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
12032 && (operator_code == PLUS_EXPR
12033 || operator_code == MINUS_EXPR
12034 || operator_code == TRUNC_DIV_EXPR
12035 || operator_code == MULT_EXPR
12036 || operator_code == TRUNC_MOD_EXPR)
12037 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
12038 warning (OPT_Weffc__, "%qD should return by value", decl);
12040 /* [over.oper]/8 */
12041 for (; argtypes && argtypes != void_list_node;
12042 argtypes = TREE_CHAIN (argtypes))
12043 if (TREE_PURPOSE (argtypes))
12045 TREE_PURPOSE (argtypes) = NULL_TREE;
12046 if (operator_code == POSTINCREMENT_EXPR
12047 || operator_code == POSTDECREMENT_EXPR)
12049 pedwarn (input_location, OPT_Wpedantic, "%qD cannot have default arguments",
12054 error ("%qD cannot have default arguments", decl);
12062 /* Return a string giving the keyword associate with CODE. */
12064 static const char *
12065 tag_name (enum tag_types code)
12077 case typename_type:
12080 gcc_unreachable ();
12084 /* Name lookup in an elaborated-type-specifier (after the keyword
12085 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
12086 elaborated-type-specifier is invalid, issue a diagnostic and return
12087 error_mark_node; otherwise, return the *_TYPE to which it referred.
12088 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
12091 check_elaborated_type_specifier (enum tag_types tag_code,
12093 bool allow_template_p)
12099 struct S { struct S *p; };
12101 name lookup will find the TYPE_DECL for the implicit "S::S"
12102 typedef. Adjust for that here. */
12103 if (DECL_SELF_REFERENCE_P (decl))
12104 decl = TYPE_NAME (TREE_TYPE (decl));
12106 type = TREE_TYPE (decl);
12108 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
12109 is false for this case as well. */
12110 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
12112 error ("using template type parameter %qT after %qs",
12113 type, tag_name (tag_code));
12114 return error_mark_node;
12116 /* Accept template template parameters. */
12117 else if (allow_template_p
12118 && (TREE_CODE (type) == BOUND_TEMPLATE_TEMPLATE_PARM
12119 || TREE_CODE (type) == TEMPLATE_TEMPLATE_PARM))
12123 If the identifier resolves to a typedef-name or the
12124 simple-template-id resolves to an alias template
12125 specialization, the elaborated-type-specifier is ill-formed.
12127 In other words, the only legitimate declaration to use in the
12128 elaborated type specifier is the implicit typedef created when
12129 the type is declared. */
12130 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
12131 && !DECL_SELF_REFERENCE_P (decl)
12132 && tag_code != typename_type)
12134 if (alias_template_specialization_p (type))
12135 error ("using alias template specialization %qT after %qs",
12136 type, tag_name (tag_code));
12138 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
12139 inform (DECL_SOURCE_LOCATION (decl),
12140 "%qD has a previous declaration here", decl);
12141 return error_mark_node;
12143 else if (TREE_CODE (type) != RECORD_TYPE
12144 && TREE_CODE (type) != UNION_TYPE
12145 && tag_code != enum_type
12146 && tag_code != typename_type)
12148 error ("%qT referred to as %qs", type, tag_name (tag_code));
12149 inform (input_location, "%q+T has a previous declaration here", type);
12150 return error_mark_node;
12152 else if (TREE_CODE (type) != ENUMERAL_TYPE
12153 && tag_code == enum_type)
12155 error ("%qT referred to as enum", type);
12156 inform (input_location, "%q+T has a previous declaration here", type);
12157 return error_mark_node;
12159 else if (!allow_template_p
12160 && TREE_CODE (type) == RECORD_TYPE
12161 && CLASSTYPE_IS_TEMPLATE (type))
12163 /* If a class template appears as elaborated type specifier
12164 without a template header such as:
12166 template <class T> class C {};
12167 void f(class C); // No template header here
12169 then the required template argument is missing. */
12170 error ("template argument required for %<%s %T%>",
12171 tag_name (tag_code),
12172 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
12173 return error_mark_node;
12179 /* Lookup NAME in elaborate type specifier in scope according to
12180 SCOPE and issue diagnostics if necessary.
12181 Return *_TYPE node upon success, NULL_TREE when the NAME is not
12182 found, and ERROR_MARK_NODE for type error. */
12185 lookup_and_check_tag (enum tag_types tag_code, tree name,
12186 tag_scope scope, bool template_header_p)
12190 if (scope == ts_global)
12192 /* First try ordinary name lookup, ignoring hidden class name
12193 injected via friend declaration. */
12194 decl = lookup_name_prefer_type (name, 2);
12195 decl = strip_using_decl (decl);
12196 /* If that fails, the name will be placed in the smallest
12197 non-class, non-function-prototype scope according to 3.3.1/5.
12198 We may already have a hidden name declared as friend in this
12199 scope. So lookup again but not ignoring hidden names.
12200 If we find one, that name will be made visible rather than
12201 creating a new tag. */
12203 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
12206 decl = lookup_type_scope (name, scope);
12209 && (DECL_CLASS_TEMPLATE_P (decl)
12210 /* If scope is ts_current we're defining a class, so ignore a
12211 template template parameter. */
12212 || (scope != ts_current
12213 && DECL_TEMPLATE_TEMPLATE_PARM_P (decl))))
12214 decl = DECL_TEMPLATE_RESULT (decl);
12216 if (decl && TREE_CODE (decl) == TYPE_DECL)
12218 /* Look for invalid nested type:
12222 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
12224 error ("%qD has the same name as the class in which it is "
12227 return error_mark_node;
12230 /* Two cases we need to consider when deciding if a class
12231 template is allowed as an elaborated type specifier:
12232 1. It is a self reference to its own class.
12233 2. It comes with a template header.
12237 template <class T> class C {
12238 class C *c1; // DECL_SELF_REFERENCE_P is true
12241 template <class U> class C; // template_header_p is true
12242 template <class T> class C<T>::D {
12243 class C *c2; // DECL_SELF_REFERENCE_P is true
12246 t = check_elaborated_type_specifier (tag_code,
12249 | DECL_SELF_REFERENCE_P (decl));
12252 else if (decl && TREE_CODE (decl) == TREE_LIST)
12254 error ("reference to %qD is ambiguous", name);
12255 print_candidates (decl);
12256 return error_mark_node;
12262 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
12263 Define the tag as a forward-reference if it is not defined.
12265 If a declaration is given, process it here, and report an error if
12266 multiple declarations are not identical.
12268 SCOPE is TS_CURRENT when this is also a definition. Only look in
12269 the current frame for the name (since C++ allows new names in any
12270 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
12271 declaration. Only look beginning from the current scope outward up
12272 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
12274 TEMPLATE_HEADER_P is true when this declaration is preceded by
12275 a set of template parameters. */
12278 xref_tag_1 (enum tag_types tag_code, tree name,
12279 tag_scope orig_scope, bool template_header_p)
12281 enum tree_code code;
12283 tree context = NULL_TREE;
12286 gcc_assert (identifier_p (name));
12292 code = RECORD_TYPE;
12298 code = ENUMERAL_TYPE;
12301 gcc_unreachable ();
12304 if (orig_scope == ts_lambda)
12305 scope = ts_current;
12307 scope = orig_scope;
12309 /* In case of anonymous name, xref_tag is only called to
12310 make type node and push name. Name lookup is not required. */
12311 if (ANON_AGGRNAME_P (name))
12314 t = lookup_and_check_tag (tag_code, name,
12315 scope, template_header_p);
12317 if (t == error_mark_node)
12318 return error_mark_node;
12320 if (scope != ts_current && t && current_class_type
12321 && template_class_depth (current_class_type)
12322 && template_header_p)
12324 if (TREE_CODE (t) == TEMPLATE_TEMPLATE_PARM)
12327 /* Since SCOPE is not TS_CURRENT, we are not looking at a
12328 definition of this tag. Since, in addition, we are currently
12329 processing a (member) template declaration of a template
12330 class, we must be very careful; consider:
12337 { template <class V>
12338 friend struct S1; };
12340 Here, the S2::S1 declaration should not be confused with the
12341 outer declaration. In particular, the inner version should
12342 have a template parameter of level 2, not level 1. This
12343 would be particularly important if the member declaration
12346 template <class V = U> friend struct S1;
12348 say, when we should tsubst into `U' when instantiating
12349 S2. On the other hand, when presented with:
12359 we must find the inner binding eventually. We
12360 accomplish this by making sure that the new type we
12361 create to represent this declaration has the right
12363 context = TYPE_CONTEXT (t);
12369 /* If no such tag is yet defined, create a forward-reference node
12370 and record it as the "definition".
12371 When a real declaration of this type is found,
12372 the forward-reference will be altered into a real type. */
12373 if (code == ENUMERAL_TYPE)
12375 error ("use of enum %q#D without previous declaration", name);
12376 return error_mark_node;
12380 t = make_class_type (code);
12381 TYPE_CONTEXT (t) = context;
12382 if (orig_scope == ts_lambda)
12383 /* Remember that we're declaring a lambda to avoid bogus errors
12384 in push_template_decl. */
12385 CLASSTYPE_LAMBDA_EXPR (t) = error_mark_node;
12386 t = pushtag (name, t, scope);
12391 if (template_header_p && MAYBE_CLASS_TYPE_P (t))
12393 if (!redeclare_class_template (t, current_template_parms))
12394 return error_mark_node;
12396 else if (!processing_template_decl
12397 && CLASS_TYPE_P (t)
12398 && CLASSTYPE_IS_TEMPLATE (t))
12400 error ("redeclaration of %qT as a non-template", t);
12401 error ("previous declaration %q+D", t);
12402 return error_mark_node;
12405 /* Make injected friend class visible. */
12406 if (scope != ts_within_enclosing_non_class
12407 && hidden_name_p (TYPE_NAME (t)))
12409 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
12410 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
12412 if (TYPE_TEMPLATE_INFO (t))
12414 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
12415 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
12423 /* Wrapper for xref_tag_1. */
12426 xref_tag (enum tag_types tag_code, tree name,
12427 tag_scope scope, bool template_header_p)
12431 subtime = timevar_cond_start (TV_NAME_LOOKUP);
12432 ret = xref_tag_1 (tag_code, name, scope, template_header_p);
12433 timevar_cond_stop (TV_NAME_LOOKUP, subtime);
12439 xref_tag_from_type (tree old, tree id, tag_scope scope)
12441 enum tag_types tag_kind;
12443 if (TREE_CODE (old) == RECORD_TYPE)
12444 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
12446 tag_kind = union_type;
12448 if (id == NULL_TREE)
12449 id = TYPE_IDENTIFIER (old);
12451 return xref_tag (tag_kind, id, scope, false);
12454 /* Create the binfo hierarchy for REF with (possibly NULL) base list
12455 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
12456 access_* node, and the TREE_VALUE is the type of the base-class.
12457 Non-NULL TREE_TYPE indicates virtual inheritance.
12459 Returns true if the binfo hierarchy was successfully created,
12460 false if an error was detected. */
12463 xref_basetypes (tree ref, tree base_list)
12466 tree binfo, base_binfo;
12467 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
12468 unsigned max_bases = 0; /* Maximum direct bases. */
12470 tree default_access;
12471 tree igo_prev; /* Track Inheritance Graph Order. */
12473 if (ref == error_mark_node)
12476 /* The base of a derived class is private by default, all others are
12478 default_access = (TREE_CODE (ref) == RECORD_TYPE
12479 && CLASSTYPE_DECLARED_CLASS (ref)
12480 ? access_private_node : access_public_node);
12482 /* First, make sure that any templates in base-classes are
12483 instantiated. This ensures that if we call ourselves recursively
12484 we do not get confused about which classes are marked and which
12486 basep = &base_list;
12489 tree basetype = TREE_VALUE (*basep);
12491 /* The dependent_type_p call below should really be dependent_scope_p
12492 so that we give a hard error about using an incomplete type as a
12493 base, but we allow it with a pedwarn for backward
12495 if (processing_template_decl
12496 && CLASS_TYPE_P (basetype) && TYPE_BEING_DEFINED (basetype))
12497 cxx_incomplete_type_diagnostic (NULL_TREE, basetype, DK_PEDWARN);
12498 if (!dependent_type_p (basetype)
12499 && !complete_type_or_else (basetype, NULL))
12500 /* An incomplete type. Remove it from the list. */
12501 *basep = TREE_CHAIN (*basep);
12505 if (TREE_TYPE (*basep))
12507 if (CLASS_TYPE_P (basetype))
12508 max_vbases += vec_safe_length (CLASSTYPE_VBASECLASSES (basetype));
12509 basep = &TREE_CHAIN (*basep);
12513 TYPE_MARKED_P (ref) = 1;
12515 /* The binfo slot should be empty, unless this is an (ill-formed)
12517 if (TYPE_BINFO (ref) && !TYPE_SIZE (ref))
12519 error ("redefinition of %q#T", ref);
12523 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
12525 binfo = make_tree_binfo (max_bases);
12527 TYPE_BINFO (ref) = binfo;
12528 BINFO_OFFSET (binfo) = size_zero_node;
12529 BINFO_TYPE (binfo) = ref;
12531 /* Apply base-class info set up to the variants of this type. */
12532 fixup_type_variants (ref);
12536 vec_alloc (BINFO_BASE_ACCESSES (binfo), max_bases);
12537 /* An aggregate cannot have baseclasses. */
12538 CLASSTYPE_NON_AGGREGATE (ref) = 1;
12540 if (TREE_CODE (ref) == UNION_TYPE)
12542 error ("derived union %qT invalid", ref);
12549 if (TYPE_FOR_JAVA (ref))
12551 error ("Java class %qT cannot have multiple bases", ref);
12558 vec_alloc (CLASSTYPE_VBASECLASSES (ref), max_vbases);
12560 if (TYPE_FOR_JAVA (ref))
12562 error ("Java class %qT cannot have virtual bases", ref);
12567 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
12569 tree access = TREE_PURPOSE (base_list);
12570 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
12571 tree basetype = TREE_VALUE (base_list);
12573 if (access == access_default_node)
12574 access = default_access;
12576 if (PACK_EXPANSION_P (basetype))
12577 basetype = PACK_EXPANSION_PATTERN (basetype);
12578 if (TREE_CODE (basetype) == TYPE_DECL)
12579 basetype = TREE_TYPE (basetype);
12580 if (!MAYBE_CLASS_TYPE_P (basetype) || TREE_CODE (basetype) == UNION_TYPE)
12582 error ("base type %qT fails to be a struct or class type",
12587 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
12588 TYPE_FOR_JAVA (ref) = 1;
12590 base_binfo = NULL_TREE;
12591 if (CLASS_TYPE_P (basetype) && !dependent_scope_p (basetype))
12593 base_binfo = TYPE_BINFO (basetype);
12594 /* The original basetype could have been a typedef'd type. */
12595 basetype = BINFO_TYPE (base_binfo);
12597 /* Inherit flags from the base. */
12598 TYPE_HAS_NEW_OPERATOR (ref)
12599 |= TYPE_HAS_NEW_OPERATOR (basetype);
12600 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
12601 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
12602 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
12603 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
12604 CLASSTYPE_DIAMOND_SHAPED_P (ref)
12605 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
12606 CLASSTYPE_REPEATED_BASE_P (ref)
12607 |= CLASSTYPE_REPEATED_BASE_P (basetype);
12610 /* We must do this test after we've seen through a typedef
12612 if (TYPE_MARKED_P (basetype))
12614 if (basetype == ref)
12615 error ("recursive type %qT undefined", basetype);
12617 error ("duplicate base type %qT invalid", basetype);
12621 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
12622 /* Regenerate the pack expansion for the bases. */
12623 basetype = make_pack_expansion (basetype);
12625 TYPE_MARKED_P (basetype) = 1;
12627 base_binfo = copy_binfo (base_binfo, basetype, ref,
12628 &igo_prev, via_virtual);
12629 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
12630 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
12632 BINFO_BASE_APPEND (binfo, base_binfo);
12633 BINFO_BASE_ACCESS_APPEND (binfo, access);
12636 if (vec_safe_length (CLASSTYPE_VBASECLASSES (ref)) < max_vbases)
12637 /* If we didn't get max_vbases vbases, we must have shared at
12638 least one of them, and are therefore diamond shaped. */
12639 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
12641 /* Unmark all the types. */
12642 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
12643 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
12644 TYPE_MARKED_P (ref) = 0;
12646 /* Now see if we have a repeated base type. */
12647 if (!CLASSTYPE_REPEATED_BASE_P (ref))
12649 for (base_binfo = binfo; base_binfo;
12650 base_binfo = TREE_CHAIN (base_binfo))
12652 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
12654 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
12657 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
12659 for (base_binfo = binfo; base_binfo;
12660 base_binfo = TREE_CHAIN (base_binfo))
12661 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
12662 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
12671 /* Copies the enum-related properties from type SRC to type DST.
12672 Used with the underlying type of an enum and the enum itself. */
12674 copy_type_enum (tree dst, tree src)
12677 for (t = dst; t; t = TYPE_NEXT_VARIANT (t))
12679 TYPE_MIN_VALUE (t) = TYPE_MIN_VALUE (src);
12680 TYPE_MAX_VALUE (t) = TYPE_MAX_VALUE (src);
12681 TYPE_SIZE (t) = TYPE_SIZE (src);
12682 TYPE_SIZE_UNIT (t) = TYPE_SIZE_UNIT (src);
12683 SET_TYPE_MODE (dst, TYPE_MODE (src));
12684 TYPE_PRECISION (t) = TYPE_PRECISION (src);
12685 TYPE_ALIGN (t) = TYPE_ALIGN (src);
12686 TYPE_USER_ALIGN (t) = TYPE_USER_ALIGN (src);
12687 TYPE_UNSIGNED (t) = TYPE_UNSIGNED (src);
12691 /* Begin compiling the definition of an enumeration type.
12694 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
12696 UNDERLYING_TYPE is the type that will be used as the storage for
12697 the enumeration type. This should be NULL_TREE if no storage type
12700 SCOPED_ENUM_P is true if this is a scoped enumeration type.
12702 if IS_NEW is not NULL, gets TRUE iff a new type is created.
12704 Returns the type object, as yet incomplete.
12705 Also records info about it so that build_enumerator
12706 may be used to declare the individual values as they are read. */
12709 start_enum (tree name, tree enumtype, tree underlying_type,
12710 bool scoped_enum_p, bool *is_new)
12712 tree prevtype = NULL_TREE;
12713 gcc_assert (identifier_p (name));
12717 /* [C++0x dcl.enum]p5:
12719 If not explicitly specified, the underlying type of a scoped
12720 enumeration type is int. */
12721 if (!underlying_type && scoped_enum_p)
12722 underlying_type = integer_type_node;
12724 if (underlying_type)
12725 underlying_type = cv_unqualified (underlying_type);
12727 /* If this is the real definition for a previous forward reference,
12728 fill in the contents in the same object that used to be the
12729 forward reference. */
12731 enumtype = lookup_and_check_tag (enum_type, name,
12732 /*tag_scope=*/ts_current,
12733 /*template_header_p=*/false);
12735 /* In case of a template_decl, the only check that should be deferred
12736 to instantiation time is the comparison of underlying types. */
12737 if (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE)
12739 if (scoped_enum_p != SCOPED_ENUM_P (enumtype))
12741 error_at (input_location, "scoped/unscoped mismatch "
12742 "in enum %q#T", enumtype);
12743 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
12744 "previous definition here");
12745 enumtype = error_mark_node;
12747 else if (ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) != !! underlying_type)
12749 error_at (input_location, "underlying type mismatch "
12750 "in enum %q#T", enumtype);
12751 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
12752 "previous definition here");
12753 enumtype = error_mark_node;
12755 else if (underlying_type && ENUM_UNDERLYING_TYPE (enumtype)
12756 && !dependent_type_p (underlying_type)
12757 && !dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype))
12758 && !same_type_p (underlying_type,
12759 ENUM_UNDERLYING_TYPE (enumtype)))
12761 error_at (input_location, "different underlying type "
12762 "in enum %q#T", enumtype);
12763 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
12764 "previous definition here");
12765 underlying_type = NULL_TREE;
12769 if (!enumtype || TREE_CODE (enumtype) != ENUMERAL_TYPE
12770 || processing_template_decl)
12772 /* In case of error, make a dummy enum to allow parsing to
12774 if (enumtype == error_mark_node)
12776 name = make_anon_name ();
12777 enumtype = NULL_TREE;
12780 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
12781 of an opaque enum, or an opaque enum of an already defined
12782 enumeration (C++0x only).
12783 In any other case, it'll be NULL_TREE. */
12789 prevtype = enumtype;
12791 /* Do not push the decl more than once, unless we need to
12792 compare underlying types at instantiation time */
12794 || TREE_CODE (enumtype) != ENUMERAL_TYPE
12795 || (underlying_type
12796 && dependent_type_p (underlying_type))
12797 || (ENUM_UNDERLYING_TYPE (enumtype)
12798 && dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype))))
12800 enumtype = cxx_make_type (ENUMERAL_TYPE);
12801 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
12804 enumtype = xref_tag (enum_type, name, /*tag_scope=*/ts_current,
12807 if (enumtype == error_mark_node)
12808 return error_mark_node;
12810 /* The enum is considered opaque until the opening '{' of the
12811 enumerator list. */
12812 SET_OPAQUE_ENUM_P (enumtype, true);
12813 ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) = !! underlying_type;
12816 SET_SCOPED_ENUM_P (enumtype, scoped_enum_p);
12818 if (underlying_type)
12820 if (CP_INTEGRAL_TYPE_P (underlying_type))
12822 copy_type_enum (enumtype, underlying_type);
12823 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
12825 else if (dependent_type_p (underlying_type))
12826 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
12828 error ("underlying type %<%T%> of %<%T%> must be an integral type",
12829 underlying_type, enumtype);
12832 /* If into a template class, the returned enum is always the first
12833 declaration (opaque or not) seen. This way all the references to
12834 this type will be to the same declaration. The following ones are used
12835 only to check for definition errors. */
12836 if (prevtype && processing_template_decl)
12842 /* After processing and defining all the values of an enumeration type,
12843 install their decls in the enumeration type.
12844 ENUMTYPE is the type object. */
12847 finish_enum_value_list (tree enumtype)
12850 tree underlying_type;
12853 tree minnode, maxnode;
12856 bool fixed_underlying_type_p
12857 = ENUM_UNDERLYING_TYPE (enumtype) != NULL_TREE;
12859 /* We built up the VALUES in reverse order. */
12860 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
12862 /* For an enum defined in a template, just set the type of the values;
12863 all further processing is postponed until the template is
12864 instantiated. We need to set the type so that tsubst of a CONST_DECL
12866 if (processing_template_decl)
12868 for (values = TYPE_VALUES (enumtype);
12870 values = TREE_CHAIN (values))
12871 TREE_TYPE (TREE_VALUE (values)) = enumtype;
12875 /* Determine the minimum and maximum values of the enumerators. */
12876 if (TYPE_VALUES (enumtype))
12878 minnode = maxnode = NULL_TREE;
12880 for (values = TYPE_VALUES (enumtype);
12882 values = TREE_CHAIN (values))
12884 decl = TREE_VALUE (values);
12886 /* [dcl.enum]: Following the closing brace of an enum-specifier,
12887 each enumerator has the type of its enumeration. Prior to the
12888 closing brace, the type of each enumerator is the type of its
12889 initializing value. */
12890 TREE_TYPE (decl) = enumtype;
12892 /* Update the minimum and maximum values, if appropriate. */
12893 value = DECL_INITIAL (decl);
12894 if (value == error_mark_node)
12895 value = integer_zero_node;
12896 /* Figure out what the minimum and maximum values of the
12897 enumerators are. */
12899 minnode = maxnode = value;
12900 else if (tree_int_cst_lt (maxnode, value))
12902 else if (tree_int_cst_lt (value, minnode))
12909 If the enumerator-list is empty, the underlying type is as if
12910 the enumeration had a single enumerator with value 0. */
12911 minnode = maxnode = integer_zero_node;
12913 if (!fixed_underlying_type_p)
12915 /* Compute the number of bits require to represent all values of the
12916 enumeration. We must do this before the type of MINNODE and
12917 MAXNODE are transformed, since tree_int_cst_min_precision relies
12918 on the TREE_TYPE of the value it is passed. */
12919 signop sgn = tree_int_cst_sgn (minnode) >= 0 ? UNSIGNED : SIGNED;
12920 int lowprec = tree_int_cst_min_precision (minnode, sgn);
12921 int highprec = tree_int_cst_min_precision (maxnode, sgn);
12922 int precision = MAX (lowprec, highprec);
12924 bool use_short_enum;
12926 /* Determine the underlying type of the enumeration.
12930 The underlying type of an enumeration is an integral type that
12931 can represent all the enumerator values defined in the
12932 enumeration. It is implementation-defined which integral type is
12933 used as the underlying type for an enumeration except that the
12934 underlying type shall not be larger than int unless the value of
12935 an enumerator cannot fit in an int or unsigned int.
12937 We use "int" or an "unsigned int" as the underlying type, even if
12938 a smaller integral type would work, unless the user has
12939 explicitly requested that we use the smallest possible type. The
12940 user can request that for all enumerations with a command line
12941 flag, or for just one enumeration with an attribute. */
12943 use_short_enum = flag_short_enums
12944 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
12946 for (itk = (use_short_enum ? itk_char : itk_int);
12950 underlying_type = integer_types[itk];
12951 if (underlying_type != NULL_TREE
12952 && TYPE_PRECISION (underlying_type) >= precision
12953 && TYPE_SIGN (underlying_type) == sgn)
12956 if (itk == itk_none)
12960 IF no integral type can represent all the enumerator values, the
12961 enumeration is ill-formed. */
12962 error ("no integral type can represent all of the enumerator values "
12963 "for %qT", enumtype);
12964 precision = TYPE_PRECISION (long_long_integer_type_node);
12965 underlying_type = integer_types[itk_unsigned_long_long];
12970 The value of sizeof() applied to an enumeration type, an object
12971 of an enumeration type, or an enumerator, is the value of sizeof()
12972 applied to the underlying type. */
12973 copy_type_enum (enumtype, underlying_type);
12975 /* Compute the minimum and maximum values for the type.
12979 For an enumeration where emin is the smallest enumerator and emax
12980 is the largest, the values of the enumeration are the values of the
12981 underlying type in the range bmin to bmax, where bmin and bmax are,
12982 respectively, the smallest and largest values of the smallest bit-
12983 field that can store emin and emax. */
12985 /* The middle-end currently assumes that types with TYPE_PRECISION
12986 narrower than their underlying type are suitably zero or sign
12987 extended to fill their mode. Similarly, it assumes that the front
12988 end assures that a value of a particular type must be within
12989 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
12991 We used to set these fields based on bmin and bmax, but that led
12992 to invalid assumptions like optimizing away bounds checking. So
12993 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
12994 TYPE_MAX_VALUE to the values for the mode above and only restrict
12995 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
12996 ENUM_UNDERLYING_TYPE (enumtype)
12997 = build_distinct_type_copy (underlying_type);
12998 TYPE_PRECISION (ENUM_UNDERLYING_TYPE (enumtype)) = precision;
12999 set_min_and_max_values_for_integral_type
13000 (ENUM_UNDERLYING_TYPE (enumtype), precision, sgn);
13002 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
13003 if (flag_strict_enums)
13004 set_min_and_max_values_for_integral_type (enumtype, precision, sgn);
13007 underlying_type = ENUM_UNDERLYING_TYPE (enumtype);
13009 /* Convert each of the enumerators to the type of the underlying
13010 type of the enumeration. */
13011 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
13013 location_t saved_location;
13015 decl = TREE_VALUE (values);
13016 saved_location = input_location;
13017 input_location = DECL_SOURCE_LOCATION (decl);
13018 if (fixed_underlying_type_p)
13019 /* If the enumeration type has a fixed underlying type, we
13020 already checked all of the enumerator values. */
13021 value = DECL_INITIAL (decl);
13023 value = perform_implicit_conversion (underlying_type,
13024 DECL_INITIAL (decl),
13025 tf_warning_or_error);
13026 input_location = saved_location;
13028 /* Do not clobber shared ints. */
13029 value = copy_node (value);
13031 TREE_TYPE (value) = enumtype;
13032 DECL_INITIAL (decl) = value;
13035 /* Fix up all variant types of this enum type. */
13036 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
13037 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
13039 if (at_class_scope_p ()
13040 && COMPLETE_TYPE_P (current_class_type)
13041 && UNSCOPED_ENUM_P (enumtype))
13042 insert_late_enum_def_into_classtype_sorted_fields (enumtype,
13043 current_class_type);
13045 /* Finish debugging output for this type. */
13046 rest_of_type_compilation (enumtype, namespace_bindings_p ());
13049 /* Finishes the enum type. This is called only the first time an
13050 enumeration is seen, be it opaque or odinary.
13051 ENUMTYPE is the type object. */
13054 finish_enum (tree enumtype)
13056 if (processing_template_decl)
13058 if (at_function_scope_p ())
13059 add_stmt (build_min (TAG_DEFN, enumtype));
13063 /* If this is a forward declaration, there should not be any variants,
13064 though we can get a variant in the middle of an enum-specifier with
13065 wacky code like 'enum E { e = sizeof(const E*) };' */
13066 gcc_assert (enumtype == TYPE_MAIN_VARIANT (enumtype)
13067 && (TYPE_VALUES (enumtype)
13068 || !TYPE_NEXT_VARIANT (enumtype)));
13071 /* Build and install a CONST_DECL for an enumeration constant of the
13072 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
13073 LOC is the location of NAME.
13074 Assignment of sequential values by default is handled here. */
13077 build_enumerator (tree name, tree value, tree enumtype, location_t loc)
13083 /* scalar_constant_value will pull out this expression, so make sure
13084 it's folded as appropriate. */
13085 if (processing_template_decl)
13086 value = fold_non_dependent_expr (value);
13088 /* If the VALUE was erroneous, pretend it wasn't there; that will
13089 result in the enum being assigned the next value in sequence. */
13090 if (value == error_mark_node)
13093 /* Remove no-op casts from the value. */
13095 STRIP_TYPE_NOPS (value);
13097 if (! processing_template_decl)
13099 /* Validate and default VALUE. */
13100 if (value != NULL_TREE)
13102 if (!ENUM_UNDERLYING_TYPE (enumtype))
13104 tree tmp_value = build_expr_type_conversion (WANT_INT | WANT_ENUM,
13109 else if (! INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (value)))
13110 value = perform_implicit_conversion_flags
13111 (ENUM_UNDERLYING_TYPE (enumtype), value, tf_warning_or_error,
13112 LOOKUP_IMPLICIT | LOOKUP_NO_NARROWING);
13114 if (value == error_mark_node)
13117 if (value != NULL_TREE)
13119 value = cxx_constant_value (value);
13121 if (TREE_CODE (value) != INTEGER_CST
13122 || ! INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (value)))
13124 error ("enumerator value for %qD is not an integer constant",
13131 /* Default based on previous value. */
13132 if (value == NULL_TREE)
13134 if (TYPE_VALUES (enumtype))
13139 /* C++03 7.2/4: If no initializer is specified for the first
13140 enumerator, the type is an unspecified integral
13141 type. Otherwise the type is the same as the type of the
13142 initializing value of the preceding enumerator unless the
13143 incremented value is not representable in that type, in
13144 which case the type is an unspecified integral type
13145 sufficient to contain the incremented value. */
13146 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
13147 if (error_operand_p (prev_value))
13148 value = error_mark_node;
13151 tree type = TREE_TYPE (prev_value);
13152 signop sgn = TYPE_SIGN (type);
13153 widest_int wi = wi::add (wi::to_widest (prev_value), 1, sgn,
13157 bool pos = !wi::neg_p (wi, sgn);
13158 if (!wi::fits_to_tree_p (wi, type))
13161 for (itk = itk_int; itk != itk_none; itk++)
13163 type = integer_types[itk];
13164 if (type != NULL_TREE
13165 && (pos || !TYPE_UNSIGNED (type))
13166 && wi::fits_to_tree_p (wi, type))
13169 if (type && cxx_dialect < cxx11
13170 && itk > itk_unsigned_long)
13171 pedwarn (input_location, OPT_Wlong_long, pos ? "\
13172 incremented enumerator value is too large for %<unsigned long%>" : "\
13173 incremented enumerator value is too large for %<long%>");
13175 if (type == NULL_TREE)
13178 value = wide_int_to_tree (type, wi);
13183 error ("overflow in enumeration values at %qD", name);
13184 value = error_mark_node;
13189 value = integer_zero_node;
13192 /* Remove no-op casts from the value. */
13193 STRIP_TYPE_NOPS (value);
13195 /* If the underlying type of the enum is fixed, check whether
13196 the enumerator values fits in the underlying type. If it
13197 does not fit, the program is ill-formed [C++0x dcl.enum]. */
13198 if (ENUM_UNDERLYING_TYPE (enumtype)
13200 && TREE_CODE (value) == INTEGER_CST)
13202 if (!int_fits_type_p (value, ENUM_UNDERLYING_TYPE (enumtype)))
13203 error ("enumerator value %E is outside the range of underlying "
13204 "type %<%T%>", value, ENUM_UNDERLYING_TYPE (enumtype));
13206 /* Convert the value to the appropriate type. */
13207 value = convert (ENUM_UNDERLYING_TYPE (enumtype), value);
13211 /* C++ associates enums with global, function, or class declarations. */
13212 context = current_scope ();
13214 /* Build the actual enumeration constant. Note that the enumeration
13215 constants have the underlying type of the enum (if it is fixed)
13216 or the type of their initializer (if the underlying type of the
13217 enum is not fixed):
13221 If the underlying type is fixed, the type of each enumerator
13222 prior to the closing brace is the underlying type; if the
13223 initializing value of an enumerator cannot be represented by
13224 the underlying type, the program is ill-formed. If the
13225 underlying type is not fixed, the type of each enumerator is
13226 the type of its initializing value.
13228 If the underlying type is not fixed, it will be computed by
13229 finish_enum and we will reset the type of this enumerator. Of
13230 course, if we're processing a template, there may be no value. */
13231 type = value ? TREE_TYPE (value) : NULL_TREE;
13233 decl = build_decl (loc, CONST_DECL, name, type);
13235 DECL_CONTEXT (decl) = enumtype;
13236 TREE_CONSTANT (decl) = 1;
13237 TREE_READONLY (decl) = 1;
13238 DECL_INITIAL (decl) = value;
13240 if (context && context == current_class_type && !SCOPED_ENUM_P (enumtype))
13241 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
13242 on the TYPE_FIELDS list for `S'. (That's so that you can say
13243 things like `S::i' later.) */
13244 finish_member_declaration (decl);
13248 /* Add this enumeration constant to the list for this type. */
13249 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
13252 /* Look for an enumerator with the given NAME within the enumeration
13253 type ENUMTYPE. This routine is used primarily for qualified name
13254 lookup into an enumerator in C++0x, e.g.,
13256 enum class Color { Red, Green, Blue };
13258 Color color = Color::Red;
13260 Returns the value corresponding to the enumerator, or
13261 NULL_TREE if no such enumerator was found. */
13263 lookup_enumerator (tree enumtype, tree name)
13266 gcc_assert (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE);
13268 e = purpose_member (name, TYPE_VALUES (enumtype));
13269 return e? TREE_VALUE (e) : NULL_TREE;
13273 /* We're defining DECL. Make sure that its type is OK. */
13276 check_function_type (tree decl, tree current_function_parms)
13278 tree fntype = TREE_TYPE (decl);
13279 tree return_type = complete_type (TREE_TYPE (fntype));
13281 /* In a function definition, arg types must be complete. */
13282 require_complete_types_for_parms (current_function_parms);
13284 if (dependent_type_p (return_type)
13285 || type_uses_auto (return_type))
13287 if (!COMPLETE_OR_VOID_TYPE_P (return_type)
13288 || (TYPE_FOR_JAVA (return_type) && MAYBE_CLASS_TYPE_P (return_type)))
13290 tree args = TYPE_ARG_TYPES (fntype);
13292 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
13293 error ("return type %q#T is incomplete", return_type);
13295 error ("return type has Java class type %q#T", return_type);
13297 /* Make it return void instead. */
13298 if (TREE_CODE (fntype) == METHOD_TYPE)
13299 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
13301 TREE_CHAIN (args));
13303 fntype = build_function_type (void_type_node, args);
13305 = build_exception_variant (fntype,
13306 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
13307 fntype = (cp_build_type_attribute_variant
13308 (fntype, TYPE_ATTRIBUTES (TREE_TYPE (decl))));
13309 TREE_TYPE (decl) = fntype;
13312 abstract_virtuals_error (decl, TREE_TYPE (fntype));
13315 /* Create the FUNCTION_DECL for a function definition.
13316 DECLSPECS and DECLARATOR are the parts of the declaration;
13317 they describe the function's name and the type it returns,
13318 but twisted together in a fashion that parallels the syntax of C.
13320 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
13321 DECLARATOR is really the DECL for the function we are about to
13322 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
13323 indicating that the function is an inline defined in-class.
13325 This function creates a binding context for the function body
13326 as well as setting up the FUNCTION_DECL in current_function_decl.
13328 For C++, we must first check whether that datum makes any sense.
13329 For example, "class A local_a(1,2);" means that variable local_a
13330 is an aggregate of type A, which should have a constructor
13331 applied to it with the argument list [1, 2].
13333 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
13334 or may be a BLOCK if the function has been defined previously
13335 in this translation unit. On exit, DECL_INITIAL (decl1) will be
13336 error_mark_node if the function has never been defined, or
13337 a BLOCK if the function has been defined somewhere. */
13340 start_preparsed_function (tree decl1, tree attrs, int flags)
13342 tree ctype = NULL_TREE;
13345 int doing_friend = 0;
13346 cp_binding_level *bl;
13347 tree current_function_parms;
13348 struct c_fileinfo *finfo
13349 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
13350 bool honor_interface;
13352 /* Sanity check. */
13353 gcc_assert (VOID_TYPE_P (TREE_VALUE (void_list_node)));
13354 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
13356 fntype = TREE_TYPE (decl1);
13357 if (TREE_CODE (fntype) == METHOD_TYPE)
13358 ctype = TYPE_METHOD_BASETYPE (fntype);
13360 /* ISO C++ 11.4/5. A friend function defined in a class is in
13361 the (lexical) scope of the class in which it is defined. */
13362 if (!ctype && DECL_FRIEND_P (decl1))
13364 ctype = DECL_FRIEND_CONTEXT (decl1);
13366 /* CTYPE could be null here if we're dealing with a template;
13367 for example, `inline friend float foo()' inside a template
13368 will have no CTYPE set. */
13369 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
13375 if (DECL_DECLARED_INLINE_P (decl1)
13376 && lookup_attribute ("noinline", attrs))
13377 warning (0, "inline function %q+D given attribute noinline", decl1);
13379 /* Handle gnu_inline attribute. */
13380 if (GNU_INLINE_P (decl1))
13382 DECL_EXTERNAL (decl1) = 1;
13383 DECL_NOT_REALLY_EXTERN (decl1) = 0;
13384 DECL_INTERFACE_KNOWN (decl1) = 1;
13385 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
13388 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
13389 /* This is a constructor, we must ensure that any default args
13390 introduced by this definition are propagated to the clones
13391 now. The clones are used directly in overload resolution. */
13392 adjust_clone_args (decl1);
13394 /* Sometimes we don't notice that a function is a static member, and
13395 build a METHOD_TYPE for it. Fix that up now. */
13396 gcc_assert (!(ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
13397 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE));
13399 /* Set up current_class_type, and enter the scope of the class, if
13402 push_nested_class (ctype);
13403 else if (DECL_STATIC_FUNCTION_P (decl1))
13404 push_nested_class (DECL_CONTEXT (decl1));
13406 /* Now that we have entered the scope of the class, we must restore
13407 the bindings for any template parameters surrounding DECL1, if it
13408 is an inline member template. (Order is important; consider the
13409 case where a template parameter has the same name as a field of
13410 the class.) It is not until after this point that
13411 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
13412 if (flags & SF_INCLASS_INLINE)
13413 maybe_begin_member_template_processing (decl1);
13415 /* Effective C++ rule 15. */
13417 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
13418 && VOID_TYPE_P (TREE_TYPE (fntype)))
13419 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
13421 /* Make the init_value nonzero so pushdecl knows this is not tentative.
13422 error_mark_node is replaced below (in poplevel) with the BLOCK. */
13423 if (!DECL_INITIAL (decl1))
13424 DECL_INITIAL (decl1) = error_mark_node;
13426 /* This function exists in static storage.
13427 (This does not mean `static' in the C sense!) */
13428 TREE_STATIC (decl1) = 1;
13430 /* We must call push_template_decl after current_class_type is set
13431 up. (If we are processing inline definitions after exiting a
13432 class scope, current_class_type will be NULL_TREE until set above
13433 by push_nested_class.) */
13434 if (processing_template_decl)
13436 tree newdecl1 = push_template_decl (decl1);
13437 if (newdecl1 == error_mark_node)
13439 if (ctype || DECL_STATIC_FUNCTION_P (decl1))
13440 pop_nested_class ();
13446 /* We are now in the scope of the function being defined. */
13447 current_function_decl = decl1;
13449 /* Save the parm names or decls from this function's declarator
13450 where store_parm_decls will find them. */
13451 current_function_parms = DECL_ARGUMENTS (decl1);
13453 /* Make sure the parameter and return types are reasonable. When
13454 you declare a function, these types can be incomplete, but they
13455 must be complete when you define the function. */
13456 check_function_type (decl1, current_function_parms);
13458 /* Build the return declaration for the function. */
13459 restype = TREE_TYPE (fntype);
13461 if (DECL_RESULT (decl1) == NULL_TREE)
13465 resdecl = build_decl (input_location, RESULT_DECL, 0, restype);
13466 DECL_ARTIFICIAL (resdecl) = 1;
13467 DECL_IGNORED_P (resdecl) = 1;
13468 DECL_RESULT (decl1) = resdecl;
13470 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
13473 /* Let the user know we're compiling this function. */
13474 announce_function (decl1);
13476 /* Record the decl so that the function name is defined.
13477 If we already have a decl for this name, and it is a FUNCTION_DECL,
13478 use the old decl. */
13479 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
13481 /* A specialization is not used to guide overload resolution. */
13482 if (!DECL_FUNCTION_MEMBER_P (decl1)
13483 && !(DECL_USE_TEMPLATE (decl1) &&
13484 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
13486 tree olddecl = pushdecl (decl1);
13488 if (olddecl == error_mark_node)
13489 /* If something went wrong when registering the declaration,
13490 use DECL1; we have to have a FUNCTION_DECL to use when
13491 parsing the body of the function. */
13495 /* Otherwise, OLDDECL is either a previous declaration
13496 of the same function or DECL1 itself. */
13498 if (warn_missing_declarations
13499 && olddecl == decl1
13500 && !DECL_MAIN_P (decl1)
13501 && TREE_PUBLIC (decl1)
13502 && !DECL_DECLARED_INLINE_P (decl1))
13506 /* Check whether DECL1 is in an anonymous
13508 for (context = DECL_CONTEXT (decl1);
13510 context = DECL_CONTEXT (context))
13512 if (TREE_CODE (context) == NAMESPACE_DECL
13513 && DECL_NAME (context) == NULL_TREE)
13517 if (context == NULL)
13518 warning (OPT_Wmissing_declarations,
13519 "no previous declaration for %q+D", decl1);
13527 /* We need to set the DECL_CONTEXT. */
13528 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
13529 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
13531 fntype = TREE_TYPE (decl1);
13532 restype = TREE_TYPE (fntype);
13534 /* If #pragma weak applies, mark the decl appropriately now.
13535 The pragma only applies to global functions. Because
13536 determining whether or not the #pragma applies involves
13537 computing the mangled name for the declaration, we cannot
13538 apply the pragma until after we have merged this declaration
13539 with any previous declarations; if the original declaration
13540 has a linkage specification, that specification applies to
13541 the definition as well, and may affect the mangled name. */
13542 if (DECL_FILE_SCOPE_P (decl1))
13543 maybe_apply_pragma_weak (decl1);
13546 /* Reset this in case the call to pushdecl changed it. */
13547 current_function_decl = decl1;
13549 gcc_assert (DECL_INITIAL (decl1));
13551 /* This function may already have been parsed, in which case just
13552 return; our caller will skip over the body without parsing. */
13553 if (DECL_INITIAL (decl1) != error_mark_node)
13556 /* Initialize RTL machinery. We cannot do this until
13557 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
13558 even when processing a template; this is how we get
13559 CFUN set up, and our per-function variables initialized.
13560 FIXME factor out the non-RTL stuff. */
13561 bl = current_binding_level;
13562 allocate_struct_function (decl1, processing_template_decl);
13564 /* Initialize the language data structures. Whenever we start
13565 a new function, we destroy temporaries in the usual way. */
13566 cfun->language = ggc_cleared_alloc<language_function> ();
13567 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
13568 current_binding_level = bl;
13570 if (!processing_template_decl && type_uses_auto (restype))
13572 FNDECL_USED_AUTO (decl1) = true;
13573 current_function_auto_return_pattern = restype;
13576 /* Start the statement-tree, start the tree now. */
13577 DECL_SAVED_TREE (decl1) = push_stmt_list ();
13579 /* If we are (erroneously) defining a function that we have already
13580 defined before, wipe out what we knew before. */
13581 if (!DECL_PENDING_INLINE_P (decl1))
13582 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
13584 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
13586 /* We know that this was set up by `grokclassfn'. We do not
13587 wait until `store_parm_decls', since evil parse errors may
13588 never get us to that point. Here we keep the consistency
13589 between `current_class_type' and `current_class_ptr'. */
13590 tree t = DECL_ARGUMENTS (decl1);
13592 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
13593 gcc_assert (TYPE_PTR_P (TREE_TYPE (t)));
13595 cp_function_chain->x_current_class_ref
13596 = cp_build_indirect_ref (t, RO_NULL, tf_warning_or_error);
13597 /* Set this second to avoid shortcut in cp_build_indirect_ref. */
13598 cp_function_chain->x_current_class_ptr = t;
13600 /* Constructors and destructors need to know whether they're "in
13601 charge" of initializing virtual base classes. */
13602 t = DECL_CHAIN (t);
13603 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
13605 current_in_charge_parm = t;
13606 t = DECL_CHAIN (t);
13608 if (DECL_HAS_VTT_PARM_P (decl1))
13610 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
13611 current_vtt_parm = t;
13615 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
13616 /* Implicitly-defined methods (like the
13617 destructor for a class in which no destructor
13618 is explicitly declared) must not be defined
13619 until their definition is needed. So, we
13620 ignore interface specifications for
13621 compiler-generated functions. */
13622 && !DECL_ARTIFICIAL (decl1));
13624 if (processing_template_decl)
13625 /* Don't mess with interface flags. */;
13626 else if (DECL_INTERFACE_KNOWN (decl1))
13628 tree ctx = decl_function_context (decl1);
13630 if (DECL_NOT_REALLY_EXTERN (decl1))
13631 DECL_EXTERNAL (decl1) = 0;
13633 if (ctx != NULL_TREE && vague_linkage_p (ctx))
13634 /* This is a function in a local class in an extern inline
13635 or template function. */
13636 comdat_linkage (decl1);
13638 /* If this function belongs to an interface, it is public.
13639 If it belongs to someone else's interface, it is also external.
13640 This only affects inlines and template instantiations. */
13641 else if (!finfo->interface_unknown && honor_interface)
13643 if (DECL_DECLARED_INLINE_P (decl1)
13644 || DECL_TEMPLATE_INSTANTIATION (decl1))
13646 DECL_EXTERNAL (decl1)
13647 = (finfo->interface_only
13648 || (DECL_DECLARED_INLINE_P (decl1)
13649 && ! flag_implement_inlines
13650 && !DECL_VINDEX (decl1)));
13652 /* For WIN32 we also want to put these in linkonce sections. */
13653 maybe_make_one_only (decl1);
13656 DECL_EXTERNAL (decl1) = 0;
13657 DECL_INTERFACE_KNOWN (decl1) = 1;
13658 /* If this function is in an interface implemented in this file,
13659 make sure that the back end knows to emit this function
13661 if (!DECL_EXTERNAL (decl1))
13662 mark_needed (decl1);
13664 else if (finfo->interface_unknown && finfo->interface_only
13665 && honor_interface)
13667 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
13668 interface, we will have both finfo->interface_unknown and
13669 finfo->interface_only set. In that case, we don't want to
13670 use the normal heuristics because someone will supply a
13671 #pragma implementation elsewhere, and deducing it here would
13672 produce a conflict. */
13673 comdat_linkage (decl1);
13674 DECL_EXTERNAL (decl1) = 0;
13675 DECL_INTERFACE_KNOWN (decl1) = 1;
13676 DECL_DEFER_OUTPUT (decl1) = 1;
13680 /* This is a definition, not a reference.
13681 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
13682 if (!GNU_INLINE_P (decl1))
13683 DECL_EXTERNAL (decl1) = 0;
13685 if ((DECL_DECLARED_INLINE_P (decl1)
13686 || DECL_TEMPLATE_INSTANTIATION (decl1))
13687 && ! DECL_INTERFACE_KNOWN (decl1))
13688 DECL_DEFER_OUTPUT (decl1) = 1;
13690 DECL_INTERFACE_KNOWN (decl1) = 1;
13693 /* Determine the ELF visibility attribute for the function. We must not
13694 do this before calling "pushdecl", as we must allow "duplicate_decls"
13695 to merge any attributes appropriately. We also need to wait until
13697 if (!DECL_CLONED_FUNCTION_P (decl1))
13698 determine_visibility (decl1);
13700 if (!processing_template_decl)
13701 maybe_instantiate_noexcept (decl1);
13703 begin_scope (sk_function_parms, decl1);
13707 if (DECL_DESTRUCTOR_P (decl1)
13708 || (DECL_CONSTRUCTOR_P (decl1)
13709 && targetm.cxx.cdtor_returns_this ()))
13711 cdtor_label = create_artificial_label (input_location);
13714 start_fname_decls ();
13716 store_parm_decls (current_function_parms);
13722 /* Like start_preparsed_function, except that instead of a
13723 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
13725 Returns true on success. If the DECLARATOR is not suitable
13726 for a function, we return false, which tells the parser to
13727 skip the entire function. */
13730 start_function (cp_decl_specifier_seq *declspecs,
13731 const cp_declarator *declarator,
13736 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
13737 if (decl1 == error_mark_node)
13739 /* If the declarator is not suitable for a function definition,
13740 cause a syntax error. */
13741 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
13743 error ("invalid function declaration");
13747 if (DECL_MAIN_P (decl1))
13748 /* main must return int. grokfndecl should have corrected it
13749 (and issued a diagnostic) if the user got it wrong. */
13750 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
13751 integer_type_node));
13753 return start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
13756 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
13760 use_eh_spec_block (tree fn)
13762 return (flag_exceptions && flag_enforce_eh_specs
13763 && !processing_template_decl
13764 && !type_throw_all_p (TREE_TYPE (fn))
13765 /* We insert the EH_SPEC_BLOCK only in the original
13766 function; then, it is copied automatically to the
13768 && !DECL_CLONED_FUNCTION_P (fn)
13769 /* Implicitly-generated constructors and destructors have
13770 exception specifications. However, those specifications
13771 are the union of the possible exceptions specified by the
13772 constructors/destructors for bases and members, so no
13773 unallowed exception will ever reach this function. By
13774 not creating the EH_SPEC_BLOCK we save a little memory,
13775 and we avoid spurious warnings about unreachable
13777 && !DECL_DEFAULTED_FN (fn));
13780 /* Store the parameter declarations into the current function declaration.
13781 This is called after parsing the parameter declarations, before
13782 digesting the body of the function.
13784 Also install to binding contour return value identifier, if any. */
13787 store_parm_decls (tree current_function_parms)
13789 tree fndecl = current_function_decl;
13792 /* This is a chain of any other decls that came in among the parm
13793 declarations. If a parm is declared with enum {foo, bar} x;
13794 then CONST_DECLs for foo and bar are put here. */
13795 tree nonparms = NULL_TREE;
13797 if (current_function_parms)
13799 /* This case is when the function was defined with an ANSI prototype.
13800 The parms already have decls, so we need not do anything here
13801 except record them as in effect
13802 and complain if any redundant old-style parm decls were written. */
13804 tree specparms = current_function_parms;
13807 /* Must clear this because it might contain TYPE_DECLs declared
13809 current_binding_level->names = NULL;
13811 /* If we're doing semantic analysis, then we'll call pushdecl
13812 for each of these. We must do them in reverse order so that
13813 they end in the correct forward order. */
13814 specparms = nreverse (specparms);
13816 for (parm = specparms; parm; parm = next)
13818 next = DECL_CHAIN (parm);
13819 if (TREE_CODE (parm) == PARM_DECL)
13821 if (DECL_NAME (parm) == NULL_TREE
13822 || !VOID_TYPE_P (parm))
13825 error ("parameter %qD declared void", parm);
13829 /* If we find an enum constant or a type tag,
13830 put it aside for the moment. */
13831 TREE_CHAIN (parm) = NULL_TREE;
13832 nonparms = chainon (nonparms, parm);
13836 /* Get the decls in their original chain order and record in the
13837 function. This is all and only the PARM_DECLs that were
13838 pushed into scope by the loop above. */
13839 DECL_ARGUMENTS (fndecl) = getdecls ();
13842 DECL_ARGUMENTS (fndecl) = NULL_TREE;
13844 /* Now store the final chain of decls for the arguments
13845 as the decl-chain of the current lexical scope.
13846 Put the enumerators in as well, at the front so that
13847 DECL_ARGUMENTS is not modified. */
13848 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
13850 if (use_eh_spec_block (current_function_decl))
13851 current_eh_spec_block = begin_eh_spec_block ();
13855 /* We have finished doing semantic analysis on DECL, but have not yet
13856 generated RTL for its body. Save away our current state, so that
13857 when we want to generate RTL later we know what to do. */
13860 save_function_data (tree decl)
13862 struct language_function *f;
13864 /* Save the language-specific per-function data so that we can
13865 get it back when we really expand this function. */
13866 gcc_assert (!DECL_PENDING_INLINE_P (decl));
13869 f = ggc_alloc<language_function> ();
13870 memcpy (f, cp_function_chain, sizeof (struct language_function));
13871 DECL_SAVED_FUNCTION_DATA (decl) = f;
13873 /* Clear out the bits we don't need. */
13874 f->base.x_stmt_tree.x_cur_stmt_list = NULL;
13875 f->bindings = NULL;
13876 f->x_local_names = NULL;
13877 f->base.local_typedefs = NULL;
13881 /* Set the return value of the constructor (if present). */
13884 finish_constructor_body (void)
13889 if (targetm.cxx.cdtor_returns_this ()
13890 && (! TYPE_FOR_JAVA (current_class_type)))
13892 /* Any return from a constructor will end up here. */
13893 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
13895 val = DECL_ARGUMENTS (current_function_decl);
13896 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
13897 DECL_RESULT (current_function_decl), val);
13898 /* Return the address of the object. */
13899 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
13900 add_stmt (exprstmt);
13904 /* Do all the processing for the beginning of a destructor; set up the
13905 vtable pointers and cleanups for bases and members. */
13908 begin_destructor_body (void)
13910 tree compound_stmt;
13912 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
13913 issued an error message. We still want to try to process the
13914 body of the function, but initialize_vtbl_ptrs will crash if
13915 TYPE_BINFO is NULL. */
13916 if (COMPLETE_TYPE_P (current_class_type))
13918 compound_stmt = begin_compound_stmt (0);
13919 /* Make all virtual function table pointers in non-virtual base
13920 classes point to CURRENT_CLASS_TYPE's virtual function
13922 initialize_vtbl_ptrs (current_class_ptr);
13923 finish_compound_stmt (compound_stmt);
13925 if (flag_lifetime_dse)
13927 /* Insert a cleanup to let the back end know that the object is dead
13928 when we exit the destructor, either normally or via exception. */
13929 tree btype = CLASSTYPE_AS_BASE (current_class_type);
13930 tree clobber = build_constructor (btype, NULL);
13931 TREE_THIS_VOLATILE (clobber) = true;
13932 tree bref = build_nop (build_reference_type (btype),
13933 current_class_ptr);
13934 bref = convert_from_reference (bref);
13935 tree exprstmt = build2 (MODIFY_EXPR, btype, bref, clobber);
13936 finish_decl_cleanup (NULL_TREE, exprstmt);
13939 /* And insert cleanups for our bases and members so that they
13940 will be properly destroyed if we throw. */
13941 push_base_cleanups ();
13945 /* At the end of every destructor we generate code to delete the object if
13946 necessary. Do that now. */
13949 finish_destructor_body (void)
13953 /* Any return from a destructor will end up here; that way all base
13954 and member cleanups will be run when the function returns. */
13955 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
13957 /* In a virtual destructor, we must call delete. */
13958 if (DECL_VIRTUAL_P (current_function_decl))
13961 tree virtual_size = cxx_sizeof (current_class_type);
13965 At the point of definition of a virtual destructor (including
13966 an implicit definition), non-placement operator delete shall
13967 be looked up in the scope of the destructor's class and if
13968 found shall be accessible and unambiguous. */
13969 exprstmt = build_op_delete_call (DELETE_EXPR, current_class_ptr,
13971 /*global_p=*/false,
13972 /*placement=*/NULL_TREE,
13973 /*alloc_fn=*/NULL_TREE,
13974 tf_warning_or_error);
13976 if_stmt = begin_if_stmt ();
13977 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
13978 current_in_charge_parm,
13981 finish_expr_stmt (exprstmt);
13982 finish_then_clause (if_stmt);
13983 finish_if_stmt (if_stmt);
13986 if (targetm.cxx.cdtor_returns_this ())
13990 val = DECL_ARGUMENTS (current_function_decl);
13991 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
13992 DECL_RESULT (current_function_decl), val);
13993 /* Return the address of the object. */
13994 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
13995 add_stmt (exprstmt);
13999 /* Do the necessary processing for the beginning of a function body, which
14000 in this case includes member-initializers, but not the catch clauses of
14001 a function-try-block. Currently, this means opening a binding level
14002 for the member-initializers (in a ctor), member cleanups (in a dtor),
14003 and capture proxies (in a lambda operator()). */
14006 begin_function_body (void)
14010 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
14013 if (processing_template_decl)
14014 /* Do nothing now. */;
14016 /* Always keep the BLOCK node associated with the outermost pair of
14017 curly braces of a function. These are needed for correct
14018 operation of dwarfout.c. */
14019 keep_next_level (true);
14021 stmt = begin_compound_stmt (BCS_FN_BODY);
14023 if (processing_template_decl)
14024 /* Do nothing now. */;
14025 else if (DECL_DESTRUCTOR_P (current_function_decl))
14026 begin_destructor_body ();
14031 /* Do the processing for the end of a function body. Currently, this means
14032 closing out the cleanups for fully-constructed bases and members, and in
14033 the case of the destructor, deleting the object if desired. Again, this
14034 is only meaningful for [cd]tors, since they are the only functions where
14035 there is a significant distinction between the main body and any
14036 function catch clauses. Handling, say, main() return semantics here
14037 would be wrong, as flowing off the end of a function catch clause for
14038 main() would also need to return 0. */
14041 finish_function_body (tree compstmt)
14043 if (compstmt == NULL_TREE)
14046 /* Close the block. */
14047 finish_compound_stmt (compstmt);
14049 if (processing_template_decl)
14050 /* Do nothing now. */;
14051 else if (DECL_CONSTRUCTOR_P (current_function_decl))
14052 finish_constructor_body ();
14053 else if (DECL_DESTRUCTOR_P (current_function_decl))
14054 finish_destructor_body ();
14057 /* Given a function, returns the BLOCK corresponding to the outermost level
14058 of curly braces, skipping the artificial block created for constructor
14062 outer_curly_brace_block (tree fndecl)
14064 tree block = DECL_INITIAL (fndecl);
14065 if (BLOCK_OUTER_CURLY_BRACE_P (block))
14067 block = BLOCK_SUBBLOCKS (block);
14068 if (BLOCK_OUTER_CURLY_BRACE_P (block))
14070 block = BLOCK_SUBBLOCKS (block);
14071 gcc_assert (BLOCK_OUTER_CURLY_BRACE_P (block));
14075 /* If FNDECL is a class's key method, add the class to the list of
14076 keyed classes that should be emitted. */
14079 record_key_method_defined (tree fndecl)
14081 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
14082 && DECL_VIRTUAL_P (fndecl)
14083 && !processing_template_decl)
14085 tree fnclass = DECL_CONTEXT (fndecl);
14086 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
14087 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
14091 /* Subroutine of finish_function.
14092 Save the body of constexpr functions for possible
14093 future compile time evaluation. */
14096 maybe_save_function_definition (tree fun)
14098 if (!processing_template_decl
14099 && DECL_DECLARED_CONSTEXPR_P (fun)
14100 && !cp_function_chain->invalid_constexpr
14101 && !DECL_CLONED_FUNCTION_P (fun))
14102 register_constexpr_fundef (fun, DECL_SAVED_TREE (fun));
14105 /* Finish up a function declaration and compile that function
14106 all the way to assembler language output. The free the storage
14107 for the function definition.
14109 FLAGS is a bitwise or of the following values:
14111 We just finished processing the body of an in-class inline
14112 function definition. (This processing will have taken place
14113 after the class definition is complete.) */
14116 finish_function (int flags)
14118 tree fndecl = current_function_decl;
14119 tree fntype, ctype = NULL_TREE;
14120 int inclass_inline = (flags & 2) != 0;
14122 /* When we get some parse errors, we can end up without a
14123 current_function_decl, so cope. */
14124 if (fndecl == NULL_TREE)
14125 return error_mark_node;
14127 if (c_dialect_objc ())
14128 objc_finish_function ();
14130 gcc_assert (!defer_mark_used_calls);
14131 defer_mark_used_calls = true;
14133 record_key_method_defined (fndecl);
14135 fntype = TREE_TYPE (fndecl);
14137 /* TREE_READONLY (fndecl) = 1;
14138 This caused &foo to be of type ptr-to-const-function
14139 which then got a warning when stored in a ptr-to-function variable. */
14141 gcc_assert (building_stmt_list_p ());
14142 /* The current function is being defined, so its DECL_INITIAL should
14143 be set, and unless there's a multiple definition, it should be
14144 error_mark_node. */
14145 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
14147 /* For a cloned function, we've already got all the code we need;
14148 there's no need to add any extra bits. */
14149 if (!DECL_CLONED_FUNCTION_P (fndecl))
14151 /* Make it so that `main' always returns 0 by default. */
14152 if (DECL_MAIN_P (current_function_decl))
14153 finish_return_stmt (integer_zero_node);
14155 if (use_eh_spec_block (current_function_decl))
14156 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
14157 (TREE_TYPE (current_function_decl)),
14158 current_eh_spec_block);
14161 /* If we're saving up tree structure, tie off the function now. */
14162 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
14164 if (fn_contains_cilk_spawn_p (cfun) && !processing_template_decl)
14165 cfun->cilk_frame_decl = insert_cilk_frame (fndecl);
14167 finish_fname_decls ();
14169 /* If this function can't throw any exceptions, remember that. */
14170 if (!processing_template_decl
14171 && !cp_function_chain->can_throw
14172 && !flag_non_call_exceptions
14173 && !decl_replaceable_p (fndecl))
14174 TREE_NOTHROW (fndecl) = 1;
14176 /* This must come after expand_function_end because cleanups might
14177 have declarations (from inline functions) that need to go into
14178 this function's blocks. */
14180 /* If the current binding level isn't the outermost binding level
14181 for this function, either there is a bug, or we have experienced
14182 syntax errors and the statement tree is malformed. */
14183 if (current_binding_level->kind != sk_function_parms)
14185 /* Make sure we have already experienced errors. */
14186 gcc_assert (errorcount);
14188 /* Throw away the broken statement tree and extra binding
14190 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
14192 while (current_binding_level->kind != sk_function_parms)
14194 if (current_binding_level->kind == sk_class)
14195 pop_nested_class ();
14197 poplevel (0, 0, 0);
14200 poplevel (1, 0, 1);
14202 /* Statements should always be full-expressions at the outermost set
14203 of curly braces for a function. */
14204 gcc_assert (stmts_are_full_exprs_p ());
14206 /* If there are no return statements in a function with auto return type,
14207 the return type is void. But if the declared type is something like
14208 auto*, this is an error. */
14209 if (!processing_template_decl && FNDECL_USED_AUTO (fndecl)
14210 && TREE_TYPE (fntype) == current_function_auto_return_pattern)
14212 if (!is_auto (current_function_auto_return_pattern)
14213 && !current_function_returns_value && !current_function_returns_null)
14215 error ("no return statements in function returning %qT",
14216 current_function_auto_return_pattern);
14217 inform (input_location, "only plain %<auto%> return type can be "
14218 "deduced to %<void%>");
14220 apply_deduced_return_type (fndecl, void_type_node);
14221 fntype = TREE_TYPE (fndecl);
14224 /* Save constexpr function body before it gets munged by
14225 the NRV transformation. */
14226 maybe_save_function_definition (fndecl);
14228 /* Set up the named return value optimization, if we can. Candidate
14229 variables are selected in check_return_expr. */
14230 if (current_function_return_value)
14232 tree r = current_function_return_value;
14235 if (r != error_mark_node
14236 /* This is only worth doing for fns that return in memory--and
14237 simpler, since we don't have to worry about promoted modes. */
14238 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
14239 /* Only allow this for variables declared in the outer scope of
14240 the function so we know that their lifetime always ends with a
14241 return; see g++.dg/opt/nrv6.C. We could be more flexible if
14242 we were to do this optimization in tree-ssa. */
14243 && (outer = outer_curly_brace_block (fndecl))
14244 && chain_member (r, BLOCK_VARS (outer)))
14245 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
14247 current_function_return_value = NULL_TREE;
14250 /* Remember that we were in class scope. */
14251 if (current_class_name)
14252 ctype = current_class_type;
14254 /* Must mark the RESULT_DECL as being in this function. */
14255 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
14257 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
14258 to the FUNCTION_DECL node itself. */
14259 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
14261 /* Save away current state, if appropriate. */
14262 if (!processing_template_decl)
14263 save_function_data (fndecl);
14265 /* Complain if there's just no return statement. */
14266 if (warn_return_type
14267 && !VOID_TYPE_P (TREE_TYPE (fntype))
14268 && !dependent_type_p (TREE_TYPE (fntype))
14269 && !current_function_returns_value && !current_function_returns_null
14270 /* Don't complain if we abort or throw. */
14271 && !current_function_returns_abnormally
14272 /* Don't complain if there's an infinite loop. */
14273 && !current_function_infinite_loop
14274 /* Don't complain if we are declared noreturn. */
14275 && !TREE_THIS_VOLATILE (fndecl)
14276 && !DECL_NAME (DECL_RESULT (fndecl))
14277 && !TREE_NO_WARNING (fndecl)
14278 /* Structor return values (if any) are set by the compiler. */
14279 && !DECL_CONSTRUCTOR_P (fndecl)
14280 && !DECL_DESTRUCTOR_P (fndecl)
14281 && targetm.warn_func_return (fndecl))
14283 warning (OPT_Wreturn_type,
14284 "no return statement in function returning non-void");
14285 TREE_NO_WARNING (fndecl) = 1;
14288 /* Store the end of the function, so that we get good line number
14289 info for the epilogue. */
14290 cfun->function_end_locus = input_location;
14292 /* Complain about parameters that are only set, but never otherwise used. */
14293 if (warn_unused_but_set_parameter
14294 && !processing_template_decl
14295 && errorcount == unused_but_set_errorcount
14296 && !DECL_CLONED_FUNCTION_P (fndecl))
14300 for (decl = DECL_ARGUMENTS (fndecl);
14302 decl = DECL_CHAIN (decl))
14303 if (TREE_USED (decl)
14304 && TREE_CODE (decl) == PARM_DECL
14305 && !DECL_READ_P (decl)
14306 && DECL_NAME (decl)
14307 && !DECL_ARTIFICIAL (decl)
14308 && !TREE_NO_WARNING (decl)
14309 && !DECL_IN_SYSTEM_HEADER (decl)
14310 && TREE_TYPE (decl) != error_mark_node
14311 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
14312 && (!CLASS_TYPE_P (TREE_TYPE (decl))
14313 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
14314 warning (OPT_Wunused_but_set_parameter,
14315 "parameter %q+D set but not used", decl);
14316 unused_but_set_errorcount = errorcount;
14319 /* Complain about locally defined typedefs that are not used in this
14321 maybe_warn_unused_local_typedefs ();
14323 /* Genericize before inlining. */
14324 if (!processing_template_decl)
14326 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
14327 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl);
14328 cp_genericize (fndecl);
14329 /* Clear out the bits we don't need. */
14330 f->x_current_class_ptr = NULL;
14331 f->x_current_class_ref = NULL;
14332 f->x_eh_spec_block = NULL;
14333 f->x_in_charge_parm = NULL;
14334 f->x_vtt_parm = NULL;
14335 f->x_return_value = NULL;
14336 f->bindings = NULL;
14337 f->extern_decl_map = NULL;
14338 f->infinite_loops = NULL;
14340 /* Clear out the bits we don't need. */
14341 local_names = NULL;
14343 /* We're leaving the context of this function, so zap cfun. It's still in
14344 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
14346 current_function_decl = NULL;
14348 /* If this is an in-class inline definition, we may have to pop the
14349 bindings for the template parameters that we added in
14350 maybe_begin_member_template_processing when start_function was
14352 if (inclass_inline)
14353 maybe_end_member_template_processing ();
14355 /* Leave the scope of the class. */
14357 pop_nested_class ();
14362 current_function_decl = NULL_TREE;
14364 defer_mark_used_calls = false;
14365 if (deferred_mark_used_calls)
14370 FOR_EACH_VEC_SAFE_ELT (deferred_mark_used_calls, i, decl)
14372 vec_free (deferred_mark_used_calls);
14378 /* Create the FUNCTION_DECL for a function definition.
14379 DECLSPECS and DECLARATOR are the parts of the declaration;
14380 they describe the return type and the name of the function,
14381 but twisted together in a fashion that parallels the syntax of C.
14383 This function creates a binding context for the function body
14384 as well as setting up the FUNCTION_DECL in current_function_decl.
14386 Returns a FUNCTION_DECL on success.
14388 If the DECLARATOR is not suitable for a function (it defines a datum
14389 instead), we return 0, which tells yyparse to report a parse error.
14391 May return void_type_node indicating that this method is actually
14392 a friend. See grokfield for more details.
14394 Came here with a `.pushlevel' .
14396 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
14397 CHANGES TO CODE IN `grokfield'. */
14400 grokmethod (cp_decl_specifier_seq *declspecs,
14401 const cp_declarator *declarator, tree attrlist)
14403 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
14406 if (fndecl == error_mark_node)
14407 return error_mark_node;
14409 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
14411 error ("invalid member function declaration");
14412 return error_mark_node;
14416 cplus_decl_attributes (&fndecl, attrlist, 0);
14418 /* Pass friends other than inline friend functions back. */
14419 if (fndecl == void_type_node)
14422 if (DECL_IN_AGGR_P (fndecl))
14424 if (DECL_CLASS_SCOPE_P (fndecl))
14425 error ("%qD is already defined in class %qT", fndecl,
14426 DECL_CONTEXT (fndecl));
14427 return error_mark_node;
14430 check_template_shadow (fndecl);
14432 DECL_COMDAT (fndecl) = 1;
14433 DECL_DECLARED_INLINE_P (fndecl) = 1;
14434 DECL_NO_INLINE_WARNING_P (fndecl) = 1;
14436 /* We process method specializations in finish_struct_1. */
14437 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
14439 fndecl = push_template_decl (fndecl);
14440 if (fndecl == error_mark_node)
14444 if (! DECL_FRIEND_P (fndecl))
14446 if (DECL_CHAIN (fndecl))
14448 fndecl = copy_node (fndecl);
14449 TREE_CHAIN (fndecl) = NULL_TREE;
14453 cp_finish_decl (fndecl, NULL_TREE, false, NULL_TREE, 0);
14455 DECL_IN_AGGR_P (fndecl) = 1;
14460 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
14461 we can lay it out later, when and if its type becomes complete.
14463 Also handle constexpr variables where the initializer involves
14464 an unlowered PTRMEM_CST because the class isn't complete yet. */
14467 maybe_register_incomplete_var (tree var)
14469 gcc_assert (VAR_P (var));
14471 /* Keep track of variables with incomplete types. */
14472 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
14473 && DECL_EXTERNAL (var))
14475 tree inner_type = TREE_TYPE (var);
14477 while (TREE_CODE (inner_type) == ARRAY_TYPE)
14478 inner_type = TREE_TYPE (inner_type);
14479 inner_type = TYPE_MAIN_VARIANT (inner_type);
14481 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
14482 /* RTTI TD entries are created while defining the type_info. */
14483 || (TYPE_LANG_SPECIFIC (inner_type)
14484 && TYPE_BEING_DEFINED (inner_type)))
14486 incomplete_var iv = {var, inner_type};
14487 vec_safe_push (incomplete_vars, iv);
14489 else if (!(DECL_LANG_SPECIFIC (var) && DECL_TEMPLATE_INFO (var))
14490 && decl_constant_var_p (var)
14491 && (TYPE_PTRMEM_P (inner_type) || CLASS_TYPE_P (inner_type)))
14493 /* When the outermost open class is complete we can resolve any
14494 pointers-to-members. */
14495 tree context = outermost_open_class ();
14496 incomplete_var iv = {var, context};
14497 vec_safe_push (incomplete_vars, iv);
14502 /* Called when a class type (given by TYPE) is defined. If there are
14503 any existing VAR_DECLs whose type has been completed by this
14504 declaration, update them now. */
14507 complete_vars (tree type)
14510 incomplete_var *iv;
14512 for (ix = 0; vec_safe_iterate (incomplete_vars, ix, &iv); )
14514 if (same_type_p (type, iv->incomplete_type))
14516 tree var = iv->decl;
14517 tree type = TREE_TYPE (var);
14519 if (TYPE_MAIN_VARIANT (strip_array_types (type))
14520 == iv->incomplete_type)
14522 /* Complete the type of the variable. The VAR_DECL itself
14523 will be laid out in expand_expr. */
14524 complete_type (type);
14525 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
14528 if (DECL_INITIAL (var)
14529 && decl_constant_var_p (var))
14530 DECL_INITIAL (var) = cplus_expand_constant (DECL_INITIAL (var));
14532 /* Remove this entry from the list. */
14533 incomplete_vars->unordered_remove (ix);
14539 /* Check for pending declarations which may have abstract type. */
14540 complete_type_check_abstract (type);
14543 /* If DECL is of a type which needs a cleanup, build and return an
14544 expression to perform that cleanup here. Return NULL_TREE if no
14545 cleanup need be done. */
14548 cxx_maybe_build_cleanup (tree decl, tsubst_flags_t complain)
14554 /* Assume no cleanup is required. */
14555 cleanup = NULL_TREE;
14557 if (error_operand_p (decl))
14560 /* Handle "__attribute__((cleanup))". We run the cleanup function
14561 before the destructor since the destructor is what actually
14562 terminates the lifetime of the object. */
14563 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
14570 /* Get the name specified by the user for the cleanup function. */
14571 id = TREE_VALUE (TREE_VALUE (attr));
14572 /* Look up the name to find the cleanup function to call. It is
14573 important to use lookup_name here because that is what is
14574 used in c-common.c:handle_cleanup_attribute when performing
14575 initial checks on the attribute. Note that those checks
14576 include ensuring that the function found is not an overloaded
14577 function, or an object with an overloaded call operator,
14578 etc.; we can rely on the fact that the function found is an
14579 ordinary FUNCTION_DECL. */
14580 fn = lookup_name (id);
14581 arg = build_address (decl);
14583 cleanup = cp_build_function_call_nary (fn, complain, arg, NULL_TREE);
14584 if (cleanup == error_mark_node)
14585 return error_mark_node;
14587 /* Handle ordinary C++ destructors. */
14588 type = TREE_TYPE (decl);
14589 if (type_build_dtor_call (type))
14591 int flags = LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR;
14595 if (TREE_CODE (type) == ARRAY_TYPE)
14598 addr = build_address (decl);
14600 call = build_delete (TREE_TYPE (addr), addr,
14601 sfk_complete_destructor, flags, 0, complain);
14602 if (call == error_mark_node)
14603 cleanup = error_mark_node;
14604 else if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
14605 /* Discard the call. */;
14607 cleanup = cp_build_compound_expr (cleanup, call, complain);
14612 /* build_delete sets the location of the destructor call to the
14613 current location, even though the destructor is going to be
14614 called later, at the end of the current scope. This can lead to
14615 a "jumpy" behaviour for users of debuggers when they step around
14616 the end of the block. So let's unset the location of the
14617 destructor call instead. */
14618 if (cleanup != NULL && EXPR_P (cleanup))
14619 SET_EXPR_LOCATION (cleanup, UNKNOWN_LOCATION);
14622 && !lookup_attribute ("warn_unused", TYPE_ATTRIBUTES (TREE_TYPE (decl))))
14623 /* Treat objects with destructors as used; the destructor may do
14624 something substantive. */
14631 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
14632 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
14633 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
14636 static_fn_type (tree memfntype)
14641 if (TYPE_PTRMEMFUNC_P (memfntype))
14642 memfntype = TYPE_PTRMEMFUNC_FN_TYPE (memfntype);
14643 if (POINTER_TYPE_P (memfntype)
14644 || TREE_CODE (memfntype) == FUNCTION_DECL)
14645 memfntype = TREE_TYPE (memfntype);
14646 if (TREE_CODE (memfntype) == FUNCTION_TYPE)
14648 gcc_assert (TREE_CODE (memfntype) == METHOD_TYPE);
14649 args = TYPE_ARG_TYPES (memfntype);
14650 cp_ref_qualifier rqual = type_memfn_rqual (memfntype);
14651 fntype = build_function_type (TREE_TYPE (memfntype), TREE_CHAIN (args));
14652 fntype = apply_memfn_quals (fntype, type_memfn_quals (memfntype), rqual);
14653 fntype = (cp_build_type_attribute_variant
14654 (fntype, TYPE_ATTRIBUTES (memfntype)));
14655 fntype = (build_exception_variant
14656 (fntype, TYPE_RAISES_EXCEPTIONS (memfntype)));
14657 if (TYPE_HAS_LATE_RETURN_TYPE (memfntype))
14658 TYPE_HAS_LATE_RETURN_TYPE (fntype) = 1;
14662 /* DECL was originally constructed as a non-static member function,
14663 but turned out to be static. Update it accordingly. */
14666 revert_static_member_fn (tree decl)
14668 tree stype = static_fn_type (decl);
14669 cp_cv_quals quals = type_memfn_quals (stype);
14670 cp_ref_qualifier rqual = type_memfn_rqual (stype);
14672 if (quals != TYPE_UNQUALIFIED || rqual != REF_QUAL_NONE)
14673 stype = apply_memfn_quals (stype, TYPE_UNQUALIFIED, REF_QUAL_NONE);
14675 TREE_TYPE (decl) = stype;
14677 if (DECL_ARGUMENTS (decl))
14678 DECL_ARGUMENTS (decl) = DECL_CHAIN (DECL_ARGUMENTS (decl));
14679 DECL_STATIC_FUNCTION_P (decl) = 1;
14682 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
14683 one of the language-independent trees. */
14685 enum cp_tree_node_structure_enum
14686 cp_tree_node_structure (union lang_tree_node * t)
14688 switch (TREE_CODE (&t->generic))
14690 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
14691 case DEFERRED_NOEXCEPT: return TS_CP_DEFERRED_NOEXCEPT;
14692 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
14693 case OVERLOAD: return TS_CP_OVERLOAD;
14694 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
14695 case PTRMEM_CST: return TS_CP_PTRMEM;
14696 case BASELINK: return TS_CP_BASELINK;
14697 case TEMPLATE_DECL: return TS_CP_TEMPLATE_DECL;
14698 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
14699 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
14700 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
14701 case LAMBDA_EXPR: return TS_CP_LAMBDA_EXPR;
14702 case TEMPLATE_INFO: return TS_CP_TEMPLATE_INFO;
14703 case USERDEF_LITERAL: return TS_CP_USERDEF_LITERAL;
14704 default: return TS_CP_GENERIC;
14708 /* Build the void_list_node (void_type_node having been created). */
14710 build_void_list_node (void)
14712 tree t = build_tree_list (NULL_TREE, void_type_node);
14717 cp_missing_noreturn_ok_p (tree decl)
14719 /* A missing noreturn is ok for the `main' function. */
14720 return DECL_MAIN_P (decl);
14723 /* Return the decl used to identify the COMDAT group into which DECL should
14727 cxx_comdat_group (tree decl)
14729 /* Virtual tables, construction virtual tables, and virtual table
14730 tables all go in a single COMDAT group, named after the primary
14732 if (VAR_P (decl) && DECL_VTABLE_OR_VTT_P (decl))
14733 decl = CLASSTYPE_VTABLES (DECL_CONTEXT (decl));
14734 /* For all other DECLs, the COMDAT group is the mangled name of the
14735 declaration itself. */
14738 while (DECL_THUNK_P (decl))
14740 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
14741 into the same section as the target function. In that case
14742 we must return target's name. */
14743 tree target = THUNK_TARGET (decl);
14744 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
14745 && DECL_SECTION_NAME (target) != NULL
14746 && DECL_ONE_ONLY (target))
14756 /* Returns the return type for FN as written by the user, which may include
14757 a placeholder for a deduced return type. */
14760 fndecl_declared_return_type (tree fn)
14762 fn = STRIP_TEMPLATE (fn);
14763 if (FNDECL_USED_AUTO (fn))
14765 struct language_function *f = NULL;
14766 if (DECL_STRUCT_FUNCTION (fn))
14767 f = DECL_STRUCT_FUNCTION (fn)->language;
14769 f = DECL_SAVED_FUNCTION_DATA (fn);
14770 return f->x_auto_return_pattern;
14772 return TREE_TYPE (TREE_TYPE (fn));
14775 /* Returns true iff DECL was declared with an auto return type and it has
14776 not yet been deduced to a real type. */
14779 undeduced_auto_decl (tree decl)
14781 if (cxx_dialect < cxx14)
14783 return type_uses_auto (TREE_TYPE (decl));
14786 /* Complain if DECL has an undeduced return type. */
14789 require_deduced_type (tree decl)
14791 if (undeduced_auto_decl (decl))
14792 error ("use of %qD before deduction of %<auto%>", decl);
14795 #include "gt-cp-decl.h"