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 if (keep == 1 || functionbody)
614 block = make_node (BLOCK);
615 if (block != NULL_TREE)
617 BLOCK_VARS (block) = decls;
618 BLOCK_SUBBLOCKS (block) = subblocks;
621 /* In each subblock, record that this is its superior. */
623 for (link = subblocks; link; link = BLOCK_CHAIN (link))
624 BLOCK_SUPERCONTEXT (link) = block;
626 /* We still support the old for-scope rules, whereby the variables
627 in a for-init statement were in scope after the for-statement
628 ended. We only use the new rules if flag_new_for_scope is
631 = current_binding_level->kind == sk_for && flag_new_for_scope == 1;
633 /* Before we remove the declarations first check for unused variables. */
634 if ((warn_unused_variable || warn_unused_but_set_variable)
635 && current_binding_level->kind != sk_template_parms
636 && !processing_template_decl)
637 for (tree d = getdecls (); d; d = TREE_CHAIN (d))
639 /* There are cases where D itself is a TREE_LIST. See in
640 push_local_binding where the list of decls returned by
641 getdecls is built. */
642 decl = TREE_CODE (d) == TREE_LIST ? TREE_VALUE (d) : d;
643 tree type = TREE_TYPE (decl);
645 && (! TREE_USED (decl) || !DECL_READ_P (decl))
646 && ! DECL_IN_SYSTEM_HEADER (decl)
647 && DECL_NAME (decl) && ! DECL_ARTIFICIAL (decl)
648 && type != error_mark_node
649 && (!CLASS_TYPE_P (type)
650 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
651 || lookup_attribute ("warn_unused",
652 TYPE_ATTRIBUTES (TREE_TYPE (decl)))))
654 if (! TREE_USED (decl))
655 warning (OPT_Wunused_variable, "unused variable %q+D", decl);
656 else if (DECL_CONTEXT (decl) == current_function_decl
657 // For -Wunused-but-set-variable leave references alone.
658 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
659 && errorcount == unused_but_set_errorcount)
661 warning (OPT_Wunused_but_set_variable,
662 "variable %q+D set but not used", decl);
663 unused_but_set_errorcount = errorcount;
668 /* Remove declarations for all the DECLs in this level. */
669 for (link = decls; link; link = TREE_CHAIN (link))
671 if (leaving_for_scope && VAR_P (link)
672 /* It's hard to make this ARM compatibility hack play nicely with
673 lambdas, and it really isn't necessary in C++11 mode. */
674 && cxx_dialect < cxx11
677 tree name = DECL_NAME (link);
681 ob = outer_binding (name,
682 IDENTIFIER_BINDING (name),
685 ns_binding = IDENTIFIER_NAMESPACE_VALUE (name);
687 ns_binding = NULL_TREE;
689 if (ob && ob->scope == current_binding_level->level_chain)
690 /* We have something like:
695 and we are leaving the `for' scope. There's no reason to
696 keep the binding of the inner `i' in this case. */
697 pop_binding (name, link);
698 else if ((ob && (TREE_CODE (ob->value) == TYPE_DECL))
699 || (ns_binding && TREE_CODE (ns_binding) == TYPE_DECL))
700 /* Here, we have something like:
708 We must pop the for-scope binding so we know what's a
709 type and what isn't. */
710 pop_binding (name, link);
713 /* Mark this VAR_DECL as dead so that we can tell we left it
714 there only for backward compatibility. */
715 DECL_DEAD_FOR_LOCAL (link) = 1;
717 /* Keep track of what should have happened when we
718 popped the binding. */
721 SET_DECL_SHADOWED_FOR_VAR (link, ob->value);
722 DECL_HAS_SHADOWED_FOR_VAR_P (link) = 1;
725 /* Add it to the list of dead variables in the next
726 outermost binding to that we can remove these when we
727 leave that binding. */
729 current_binding_level->level_chain->dead_vars_from_for,
732 /* Although we don't pop the cxx_binding, we do clear
733 its SCOPE since the scope is going away now. */
734 IDENTIFIER_BINDING (name)->scope
735 = current_binding_level->level_chain;
742 /* Remove the binding. */
745 if (TREE_CODE (decl) == TREE_LIST)
746 decl = TREE_VALUE (decl);
749 if (TREE_CODE (name) == OVERLOAD)
750 name = OVL_FUNCTION (name);
752 gcc_assert (DECL_P (name));
753 pop_binding (DECL_NAME (name), decl);
757 /* Remove declarations for any `for' variables from inner scopes
758 that we kept around. */
759 FOR_EACH_VEC_SAFE_ELT_REVERSE (current_binding_level->dead_vars_from_for,
761 pop_binding (DECL_NAME (decl), decl);
763 /* Restore the IDENTIFIER_TYPE_VALUEs. */
764 for (link = current_binding_level->type_shadowed;
765 link; link = TREE_CHAIN (link))
766 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (link), TREE_VALUE (link));
768 /* Restore the IDENTIFIER_LABEL_VALUEs for local labels. */
769 FOR_EACH_VEC_SAFE_ELT_REVERSE (current_binding_level->shadowed_labels,
771 pop_local_label (label_bind->label, label_bind->prev_value);
773 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
774 list if a `using' declaration put them there. The debugging
775 back ends won't understand OVERLOAD, so we remove them here.
776 Because the BLOCK_VARS are (temporarily) shared with
777 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
778 popped all the bindings. */
783 for (d = &BLOCK_VARS (block); *d; )
785 if (TREE_CODE (*d) == TREE_LIST)
786 *d = TREE_CHAIN (*d);
788 d = &DECL_CHAIN (*d);
792 /* If the level being exited is the top level of a function,
793 check over all the labels. */
796 /* Since this is the top level block of a function, the vars are
797 the function's parameters. Don't leave them in the BLOCK
798 because they are found in the FUNCTION_DECL instead. */
799 BLOCK_VARS (block) = 0;
803 kind = current_binding_level->kind;
804 if (kind == sk_cleanup)
808 /* If this is a temporary binding created for a cleanup, then we'll
809 have pushed a statement list level. Pop that, create a new
810 BIND_EXPR for the block, and insert it into the stream. */
811 stmt = pop_stmt_list (current_binding_level->statement_list);
812 stmt = c_build_bind_expr (input_location, block, stmt);
819 /* The current function is being defined, so its DECL_INITIAL
820 should be error_mark_node. */
821 gcc_assert (DECL_INITIAL (current_function_decl) == error_mark_node);
822 DECL_INITIAL (current_function_decl) = block;
825 current_binding_level->blocks
826 = block_chainon (current_binding_level->blocks, block);
828 /* If we did not make a block for the level just exited,
829 any blocks made for inner levels
830 (since they cannot be recorded as subblocks in that level)
831 must be carried forward so they will later become subblocks
832 of something else. */
834 current_binding_level->blocks
835 = block_chainon (current_binding_level->blocks, subblocks);
837 /* Each and every BLOCK node created here in `poplevel' is important
838 (e.g. for proper debugging information) so if we created one
839 earlier, mark it as "used". */
841 TREE_USED (block) = 1;
843 /* All temporary bindings created for cleanups are popped silently. */
844 if (kind == sk_cleanup)
847 timevar_cond_stop (TV_NAME_LOOKUP, subtime);
851 /* Walk all the namespaces contained NAMESPACE, including NAMESPACE
852 itself, calling F for each. The DATA is passed to F as well. */
855 walk_namespaces_r (tree name_space, walk_namespaces_fn f, void* data)
858 tree current = NAMESPACE_LEVEL (name_space)->namespaces;
860 result |= (*f) (name_space, data);
862 for (; current; current = DECL_CHAIN (current))
863 result |= walk_namespaces_r (current, f, data);
868 /* Walk all the namespaces, calling F for each. The DATA is passed to
872 walk_namespaces (walk_namespaces_fn f, void* data)
874 return walk_namespaces_r (global_namespace, f, data);
877 /* Call wrapup_globals_declarations for the globals in NAMESPACE. If
878 DATA is non-NULL, this is the last time we will call
879 wrapup_global_declarations for this NAMESPACE. */
882 wrapup_globals_for_namespace (tree name_space, void* data)
884 cp_binding_level *level = NAMESPACE_LEVEL (name_space);
885 vec<tree, va_gc> *statics = level->static_decls;
886 tree *vec = statics->address ();
887 int len = statics->length ();
888 int last_time = (data != 0);
892 check_global_declarations (vec, len);
893 emit_debug_global_declarations (vec, len);
897 /* Write out any globals that need to be output. */
898 return wrapup_global_declarations (vec, len);
902 /* In C++, you don't have to write `struct S' to refer to `S'; you
903 can just use `S'. We accomplish this by creating a TYPE_DECL as
904 if the user had written `typedef struct S S'. Create and return
905 the TYPE_DECL for TYPE. */
908 create_implicit_typedef (tree name, tree type)
912 decl = build_decl (input_location, TYPE_DECL, name, type);
913 DECL_ARTIFICIAL (decl) = 1;
914 /* There are other implicit type declarations, like the one *within*
915 a class that allows you to write `S::S'. We must distinguish
917 SET_DECL_IMPLICIT_TYPEDEF_P (decl);
918 TYPE_NAME (type) = decl;
919 TYPE_STUB_DECL (type) = decl;
924 /* Remember a local name for name-mangling purposes. */
927 push_local_name (tree decl)
932 timevar_start (TV_NAME_LOOKUP);
934 name = DECL_NAME (decl);
936 nelts = vec_safe_length (local_names);
937 for (i = 0; i < nelts; i++)
939 t = (*local_names)[i];
940 if (DECL_NAME (t) == name)
942 if (!DECL_LANG_SPECIFIC (decl))
943 retrofit_lang_decl (decl);
944 DECL_LANG_SPECIFIC (decl)->u.base.u2sel = 1;
945 if (DECL_DISCRIMINATOR_SET_P (t))
946 DECL_DISCRIMINATOR (decl) = DECL_DISCRIMINATOR (t) + 1;
948 DECL_DISCRIMINATOR (decl) = 1;
950 (*local_names)[i] = decl;
951 timevar_stop (TV_NAME_LOOKUP);
956 vec_safe_push (local_names, decl);
957 timevar_stop (TV_NAME_LOOKUP);
960 /* Subroutine of duplicate_decls: return truthvalue of whether
961 or not types of these decls match.
963 For C++, we must compare the parameter list so that `int' can match
964 `int&' in a parameter position, but `int&' is not confused with
968 decls_match (tree newdecl, tree olddecl)
972 if (newdecl == olddecl)
975 if (TREE_CODE (newdecl) != TREE_CODE (olddecl))
976 /* If the two DECLs are not even the same kind of thing, we're not
977 interested in their types. */
980 gcc_assert (DECL_P (newdecl));
982 if (TREE_CODE (newdecl) == FUNCTION_DECL)
984 tree f1 = TREE_TYPE (newdecl);
985 tree f2 = TREE_TYPE (olddecl);
986 tree p1 = TYPE_ARG_TYPES (f1);
987 tree p2 = TYPE_ARG_TYPES (f2);
990 /* Specializations of different templates are different functions
991 even if they have the same type. */
992 tree t1 = (DECL_USE_TEMPLATE (newdecl)
993 ? DECL_TI_TEMPLATE (newdecl)
995 tree t2 = (DECL_USE_TEMPLATE (olddecl)
996 ? DECL_TI_TEMPLATE (olddecl)
1001 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
1002 && ! (DECL_EXTERN_C_P (newdecl)
1003 && DECL_EXTERN_C_P (olddecl)))
1006 /* A new declaration doesn't match a built-in one unless it
1007 is also extern "C". */
1008 if (DECL_IS_BUILTIN (olddecl)
1009 && DECL_EXTERN_C_P (olddecl) && !DECL_EXTERN_C_P (newdecl))
1012 if (TREE_CODE (f1) != TREE_CODE (f2))
1015 /* A declaration with deduced return type should use its pre-deduction
1016 type for declaration matching. */
1017 r2 = fndecl_declared_return_type (olddecl);
1019 if (same_type_p (TREE_TYPE (f1), r2))
1021 if (!prototype_p (f2) && DECL_EXTERN_C_P (olddecl)
1022 && (DECL_BUILT_IN (olddecl)
1023 #ifndef NO_IMPLICIT_EXTERN_C
1024 || (DECL_IN_SYSTEM_HEADER (newdecl) && !DECL_CLASS_SCOPE_P (newdecl))
1025 || (DECL_IN_SYSTEM_HEADER (olddecl) && !DECL_CLASS_SCOPE_P (olddecl))
1029 types_match = self_promoting_args_p (p1);
1030 if (p1 == void_list_node)
1031 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
1033 #ifndef NO_IMPLICIT_EXTERN_C
1034 else if (!prototype_p (f1)
1035 && (DECL_EXTERN_C_P (olddecl)
1036 && DECL_IN_SYSTEM_HEADER (olddecl)
1037 && !DECL_CLASS_SCOPE_P (olddecl))
1038 && (DECL_EXTERN_C_P (newdecl)
1039 && DECL_IN_SYSTEM_HEADER (newdecl)
1040 && !DECL_CLASS_SCOPE_P (newdecl)))
1042 types_match = self_promoting_args_p (p2);
1043 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
1049 && type_memfn_rqual (f1) == type_memfn_rqual (f2)
1050 && (TYPE_ATTRIBUTES (TREE_TYPE (newdecl)) == NULL_TREE
1051 || comp_type_attributes (TREE_TYPE (newdecl),
1052 TREE_TYPE (olddecl)) != 0);
1057 /* The decls dont match if they correspond to two different versions
1058 of the same function. Disallow extern "C" functions to be
1059 versions for now. */
1061 && !DECL_EXTERN_C_P (newdecl)
1062 && !DECL_EXTERN_C_P (olddecl)
1063 && targetm.target_option.function_versions (newdecl, olddecl))
1065 /* Mark functions as versions if necessary. Modify the mangled decl
1066 name if necessary. */
1067 if (DECL_FUNCTION_VERSIONED (newdecl)
1068 && DECL_FUNCTION_VERSIONED (olddecl))
1070 if (!DECL_FUNCTION_VERSIONED (newdecl))
1072 DECL_FUNCTION_VERSIONED (newdecl) = 1;
1073 if (DECL_ASSEMBLER_NAME_SET_P (newdecl))
1074 mangle_decl (newdecl);
1076 if (!DECL_FUNCTION_VERSIONED (olddecl))
1078 DECL_FUNCTION_VERSIONED (olddecl) = 1;
1079 if (DECL_ASSEMBLER_NAME_SET_P (olddecl))
1080 mangle_decl (olddecl);
1082 cgraph_node::record_function_versions (olddecl, newdecl);
1086 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1088 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl))
1089 != TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)))
1092 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1093 DECL_TEMPLATE_PARMS (olddecl)))
1096 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1097 types_match = same_type_p (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl)),
1098 TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl)));
1100 types_match = decls_match (DECL_TEMPLATE_RESULT (olddecl),
1101 DECL_TEMPLATE_RESULT (newdecl));
1105 /* Need to check scope for variable declaration (VAR_DECL).
1106 For typedef (TYPE_DECL), scope is ignored. */
1108 && CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
1110 Two declarations for an object with C language linkage
1111 with the same name (ignoring the namespace that qualify
1112 it) that appear in different namespace scopes refer to
1114 && !(DECL_EXTERN_C_P (olddecl) && DECL_EXTERN_C_P (newdecl)))
1117 if (TREE_TYPE (newdecl) == error_mark_node)
1118 types_match = TREE_TYPE (olddecl) == error_mark_node;
1119 else if (TREE_TYPE (olddecl) == NULL_TREE)
1120 types_match = TREE_TYPE (newdecl) == NULL_TREE;
1121 else if (TREE_TYPE (newdecl) == NULL_TREE)
1124 types_match = comptypes (TREE_TYPE (newdecl),
1125 TREE_TYPE (olddecl),
1126 COMPARE_REDECLARATION);
1132 /* If NEWDECL is `static' and an `extern' was seen previously,
1133 warn about it. OLDDECL is the previous declaration.
1135 Note that this does not apply to the C++ case of declaring
1136 a variable `extern const' and then later `const'.
1138 Don't complain about built-in functions, since they are beyond
1139 the user's control. */
1142 warn_extern_redeclared_static (tree newdecl, tree olddecl)
1144 if (TREE_CODE (newdecl) == TYPE_DECL
1145 || TREE_CODE (newdecl) == TEMPLATE_DECL
1146 || TREE_CODE (newdecl) == CONST_DECL
1147 || TREE_CODE (newdecl) == NAMESPACE_DECL)
1150 /* Don't get confused by static member functions; that's a different
1152 if (TREE_CODE (newdecl) == FUNCTION_DECL
1153 && DECL_STATIC_FUNCTION_P (newdecl))
1156 /* If the old declaration was `static', or the new one isn't, then
1157 everything is OK. */
1158 if (DECL_THIS_STATIC (olddecl) || !DECL_THIS_STATIC (newdecl))
1161 /* It's OK to declare a builtin function as `static'. */
1162 if (TREE_CODE (olddecl) == FUNCTION_DECL
1163 && DECL_ARTIFICIAL (olddecl))
1166 if (permerror (input_location,
1167 "%qD was declared %<extern%> and later %<static%>", newdecl))
1168 inform (input_location, "previous declaration of %q+D", olddecl);
1171 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1172 function templates. If their exception specifications do not
1173 match, issue a diagnostic. */
1176 check_redeclaration_exception_specification (tree new_decl,
1179 tree new_exceptions = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (new_decl));
1180 tree old_exceptions = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (old_decl));
1182 /* Two default specs are equivalent, don't force evaluation. */
1183 if (UNEVALUATED_NOEXCEPT_SPEC_P (new_exceptions)
1184 && UNEVALUATED_NOEXCEPT_SPEC_P (old_exceptions))
1187 maybe_instantiate_noexcept (new_decl);
1188 maybe_instantiate_noexcept (old_decl);
1189 new_exceptions = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (new_decl));
1190 old_exceptions = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (old_decl));
1194 If any declaration of a function has an exception-specification,
1195 all declarations, including the definition and an explicit
1196 specialization, of that function shall have an
1197 exception-specification with the same set of type-ids. */
1198 if ((pedantic || ! DECL_IN_SYSTEM_HEADER (old_decl))
1199 && ! DECL_IS_BUILTIN (old_decl)
1201 && !comp_except_specs (new_exceptions, old_exceptions, ce_normal))
1203 error ("declaration of %qF has a different exception specifier",
1205 error ("from previous declaration %q+F", old_decl);
1209 /* Return true if OLD_DECL and NEW_DECL agree on constexprness.
1210 Otherwise issue diagnostics. */
1213 validate_constexpr_redeclaration (tree old_decl, tree new_decl)
1215 old_decl = STRIP_TEMPLATE (old_decl);
1216 new_decl = STRIP_TEMPLATE (new_decl);
1217 if (!VAR_OR_FUNCTION_DECL_P (old_decl)
1218 || !VAR_OR_FUNCTION_DECL_P (new_decl))
1220 if (DECL_DECLARED_CONSTEXPR_P (old_decl)
1221 == DECL_DECLARED_CONSTEXPR_P (new_decl))
1223 if (TREE_CODE (old_decl) == FUNCTION_DECL)
1225 if (DECL_BUILT_IN (old_decl))
1227 /* Hide a built-in declaration. */
1228 DECL_DECLARED_CONSTEXPR_P (old_decl)
1229 = DECL_DECLARED_CONSTEXPR_P (new_decl);
1232 /* 7.1.5 [dcl.constexpr]
1233 Note: An explicit specialization can differ from the template
1234 declaration with respect to the constexpr specifier. */
1235 if (! DECL_TEMPLATE_SPECIALIZATION (old_decl)
1236 && DECL_TEMPLATE_SPECIALIZATION (new_decl))
1239 error ("redeclaration %qD differs in %<constexpr%>", new_decl);
1240 error ("from previous declaration %q+D", old_decl);
1246 /* DECL is a redeclaration of a function or function template. If
1247 it does have default arguments issue a diagnostic. Note: this
1248 function is used to enforce the requirements in C++11 8.3.6 about
1249 no default arguments in redeclarations. */
1252 check_redeclaration_no_default_args (tree decl)
1254 gcc_assert (DECL_DECLARES_FUNCTION_P (decl));
1256 for (tree t = FUNCTION_FIRST_USER_PARMTYPE (decl);
1257 t && t != void_list_node; t = TREE_CHAIN (t))
1258 if (TREE_PURPOSE (t))
1260 permerror (input_location,
1261 "redeclaration of %q#D may not have default "
1267 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1268 && lookup_attribute ("gnu_inline", \
1269 DECL_ATTRIBUTES (fn)))
1271 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1272 If the redeclaration is invalid, a diagnostic is issued, and the
1273 error_mark_node is returned. Otherwise, OLDDECL is returned.
1275 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1278 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1281 duplicate_decls (tree newdecl, tree olddecl, bool newdecl_is_friend)
1283 unsigned olddecl_uid = DECL_UID (olddecl);
1284 int olddecl_friend = 0, types_match = 0, hidden_friend = 0;
1285 int new_defines_function = 0;
1286 tree new_template_info;
1288 if (newdecl == olddecl)
1291 types_match = decls_match (newdecl, olddecl);
1293 /* If either the type of the new decl or the type of the old decl is an
1294 error_mark_node, then that implies that we have already issued an
1295 error (earlier) for some bogus type specification, and in that case,
1296 it is rather pointless to harass the user with yet more error message
1297 about the same declaration, so just pretend the types match here. */
1298 if (TREE_TYPE (newdecl) == error_mark_node
1299 || TREE_TYPE (olddecl) == error_mark_node)
1300 return error_mark_node;
1302 if (UDLIT_OPER_P (DECL_NAME (newdecl))
1303 && UDLIT_OPER_P (DECL_NAME (olddecl)))
1305 if (TREE_CODE (newdecl) == TEMPLATE_DECL
1306 && TREE_CODE (olddecl) != TEMPLATE_DECL
1307 && check_raw_literal_operator (olddecl))
1308 error ("literal operator template %q+D conflicts with"
1309 " raw literal operator %qD", newdecl, olddecl);
1310 else if (TREE_CODE (newdecl) != TEMPLATE_DECL
1311 && TREE_CODE (olddecl) == TEMPLATE_DECL
1312 && check_raw_literal_operator (newdecl))
1313 error ("raw literal operator %q+D conflicts with"
1314 " literal operator template %qD", newdecl, olddecl);
1317 if (DECL_P (olddecl)
1318 && TREE_CODE (newdecl) == FUNCTION_DECL
1319 && TREE_CODE (olddecl) == FUNCTION_DECL
1320 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1322 if (DECL_DECLARED_INLINE_P (newdecl)
1323 && DECL_UNINLINABLE (newdecl)
1324 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1325 /* Already warned elsewhere. */;
1326 else if (DECL_DECLARED_INLINE_P (olddecl)
1327 && DECL_UNINLINABLE (olddecl)
1328 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1329 /* Already warned. */;
1330 else if (DECL_DECLARED_INLINE_P (newdecl)
1331 && DECL_UNINLINABLE (olddecl)
1332 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1334 if (warning (OPT_Wattributes, "function %q+D redeclared as inline",
1336 inform (DECL_SOURCE_LOCATION (olddecl),
1337 "previous declaration of %qD with attribute noinline",
1340 else if (DECL_DECLARED_INLINE_P (olddecl)
1341 && DECL_UNINLINABLE (newdecl)
1342 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1344 if (warning (OPT_Wattributes, "function %q+D redeclared with "
1345 "attribute noinline", newdecl))
1346 inform (DECL_SOURCE_LOCATION (olddecl),
1347 "previous declaration of %qD was inline",
1352 /* Check for redeclaration and other discrepancies. */
1353 if (TREE_CODE (olddecl) == FUNCTION_DECL
1354 && DECL_ARTIFICIAL (olddecl))
1356 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl));
1357 if (TREE_CODE (newdecl) != FUNCTION_DECL)
1359 /* Avoid warnings redeclaring built-ins which have not been
1360 explicitly declared. */
1361 if (DECL_ANTICIPATED (olddecl))
1364 /* If you declare a built-in or predefined function name as static,
1365 the old definition is overridden, but optionally warn this was a
1366 bad choice of name. */
1367 if (! TREE_PUBLIC (newdecl))
1369 warning (OPT_Wshadow,
1370 DECL_BUILT_IN (olddecl)
1371 ? G_("shadowing built-in function %q#D")
1372 : G_("shadowing library function %q#D"), olddecl);
1373 /* Discard the old built-in function. */
1376 /* If the built-in is not ansi, then programs can override
1377 it even globally without an error. */
1378 else if (! DECL_BUILT_IN (olddecl))
1379 warning (0, "library function %q#D redeclared as non-function %q#D",
1382 error ("declaration of %q#D conflicts with built-in "
1383 "declaration %q#D", newdecl, olddecl);
1386 else if (DECL_OMP_DECLARE_REDUCTION_P (olddecl))
1388 gcc_assert (DECL_OMP_DECLARE_REDUCTION_P (newdecl));
1389 error_at (DECL_SOURCE_LOCATION (newdecl),
1390 "redeclaration of %<pragma omp declare reduction%>");
1391 inform (DECL_SOURCE_LOCATION (olddecl),
1392 "previous %<pragma omp declare reduction%> declaration");
1393 return error_mark_node;
1395 else if (!types_match)
1397 /* Avoid warnings redeclaring built-ins which have not been
1398 explicitly declared. */
1399 if (DECL_ANTICIPATED (olddecl))
1401 /* Deal with fileptr_type_node. FILE type is not known
1402 at the time we create the builtins. */
1405 for (t1 = TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1406 t2 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1408 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1411 else if (TREE_VALUE (t2) == fileptr_type_node)
1413 tree t = TREE_VALUE (t1);
1416 && TYPE_IDENTIFIER (TREE_TYPE (t))
1417 == get_identifier ("FILE")
1418 && compparms (TREE_CHAIN (t1), TREE_CHAIN (t2)))
1420 tree oldargs = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1422 TYPE_ARG_TYPES (TREE_TYPE (olddecl))
1423 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1424 types_match = decls_match (newdecl, olddecl);
1426 return duplicate_decls (newdecl, olddecl,
1428 TYPE_ARG_TYPES (TREE_TYPE (olddecl)) = oldargs;
1431 else if (! same_type_p (TREE_VALUE (t1), TREE_VALUE (t2)))
1434 else if ((DECL_EXTERN_C_P (newdecl)
1435 && DECL_EXTERN_C_P (olddecl))
1436 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1437 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1439 /* A near match; override the builtin. */
1441 if (TREE_PUBLIC (newdecl))
1442 warning (0, "new declaration %q#D ambiguates built-in "
1443 "declaration %q#D", newdecl, olddecl);
1445 warning (OPT_Wshadow,
1446 DECL_BUILT_IN (olddecl)
1447 ? G_("shadowing built-in function %q#D")
1448 : G_("shadowing library function %q#D"), olddecl);
1451 /* Discard the old built-in function. */
1454 /* Replace the old RTL to avoid problems with inlining. */
1455 COPY_DECL_RTL (newdecl, olddecl);
1457 /* Even if the types match, prefer the new declarations type for
1458 built-ins which have not been explicitly declared, for
1459 exception lists, etc... */
1460 else if (DECL_IS_BUILTIN (olddecl))
1462 tree type = TREE_TYPE (newdecl);
1463 tree attribs = (*targetm.merge_type_attributes)
1464 (TREE_TYPE (olddecl), type);
1466 type = cp_build_type_attribute_variant (type, attribs);
1467 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = type;
1470 /* If a function is explicitly declared "throw ()", propagate that to
1471 the corresponding builtin. */
1472 if (DECL_BUILT_IN_CLASS (olddecl) == BUILT_IN_NORMAL
1473 && DECL_ANTICIPATED (olddecl)
1474 && TREE_NOTHROW (newdecl)
1475 && !TREE_NOTHROW (olddecl))
1477 enum built_in_function fncode = DECL_FUNCTION_CODE (olddecl);
1478 tree tmpdecl = builtin_decl_explicit (fncode);
1479 if (tmpdecl && tmpdecl != olddecl && types_match)
1480 TREE_NOTHROW (tmpdecl) = 1;
1483 /* Whether or not the builtin can throw exceptions has no
1484 bearing on this declarator. */
1485 TREE_NOTHROW (olddecl) = 0;
1487 if (DECL_THIS_STATIC (newdecl) && !DECL_THIS_STATIC (olddecl))
1489 /* If a builtin function is redeclared as `static', merge
1490 the declarations, but make the original one static. */
1491 DECL_THIS_STATIC (olddecl) = 1;
1492 TREE_PUBLIC (olddecl) = 0;
1494 /* Make the old declaration consistent with the new one so
1495 that all remnants of the builtin-ness of this function
1496 will be banished. */
1497 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1498 COPY_DECL_RTL (newdecl, olddecl);
1501 else if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1503 /* C++ Standard, 3.3, clause 4:
1504 "[Note: a namespace name or a class template name must be unique
1505 in its declarative region (7.3.2, clause 14). ]" */
1506 if (TREE_CODE (olddecl) != NAMESPACE_DECL
1507 && TREE_CODE (newdecl) != NAMESPACE_DECL
1508 && (TREE_CODE (olddecl) != TEMPLATE_DECL
1509 || TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) != TYPE_DECL)
1510 && (TREE_CODE (newdecl) != TEMPLATE_DECL
1511 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != TYPE_DECL))
1513 if ((TREE_CODE (olddecl) == TYPE_DECL && DECL_ARTIFICIAL (olddecl)
1514 && TREE_CODE (newdecl) != TYPE_DECL)
1515 || (TREE_CODE (newdecl) == TYPE_DECL && DECL_ARTIFICIAL (newdecl)
1516 && TREE_CODE (olddecl) != TYPE_DECL))
1518 /* We do nothing special here, because C++ does such nasty
1519 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1520 get shadowed, and know that if we need to find a TYPE_DECL
1521 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1522 slot of the identifier. */
1526 if ((TREE_CODE (newdecl) == FUNCTION_DECL
1527 && DECL_FUNCTION_TEMPLATE_P (olddecl))
1528 || (TREE_CODE (olddecl) == FUNCTION_DECL
1529 && DECL_FUNCTION_TEMPLATE_P (newdecl)))
1533 error ("%q#D redeclared as different kind of symbol", newdecl);
1534 if (TREE_CODE (olddecl) == TREE_LIST)
1535 olddecl = TREE_VALUE (olddecl);
1536 inform (DECL_SOURCE_LOCATION (olddecl),
1537 "previous declaration %q#D", olddecl);
1539 return error_mark_node;
1541 else if (!types_match)
1543 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
1544 /* These are certainly not duplicate declarations; they're
1545 from different scopes. */
1548 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1550 /* The name of a class template may not be declared to refer to
1551 any other template, class, function, object, namespace, value,
1552 or type in the same scope. */
1553 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == TYPE_DECL
1554 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1556 error ("conflicting declaration of template %q#D", newdecl);
1557 inform (DECL_SOURCE_LOCATION (olddecl),
1558 "previous declaration %q#D", olddecl);
1559 return error_mark_node;
1561 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == FUNCTION_DECL
1562 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == FUNCTION_DECL
1563 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl))),
1564 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl))))
1565 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1566 DECL_TEMPLATE_PARMS (olddecl))
1567 /* Template functions can be disambiguated by
1569 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl)),
1570 TREE_TYPE (TREE_TYPE (olddecl))))
1572 error ("ambiguating new declaration %q#D", newdecl);
1573 inform (DECL_SOURCE_LOCATION (olddecl),
1574 "old declaration %q#D", olddecl);
1578 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1580 if (DECL_EXTERN_C_P (newdecl) && DECL_EXTERN_C_P (olddecl))
1582 error ("conflicting declaration of C function %q#D",
1584 inform (DECL_SOURCE_LOCATION (olddecl),
1585 "previous declaration %q#D", olddecl);
1588 /* For function versions, params and types match, but they
1589 are not ambiguous. */
1590 else if ((!DECL_FUNCTION_VERSIONED (newdecl)
1591 && !DECL_FUNCTION_VERSIONED (olddecl))
1592 && compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1593 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1595 error ("ambiguating new declaration of %q#D", newdecl);
1596 inform (DECL_SOURCE_LOCATION (olddecl),
1597 "old declaration %q#D", olddecl);
1598 return error_mark_node;
1605 error ("conflicting declaration %q#D", newdecl);
1606 inform (DECL_SOURCE_LOCATION (olddecl),
1607 "previous declaration as %q#D", olddecl);
1608 return error_mark_node;
1611 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1612 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1613 && (!DECL_TEMPLATE_INFO (newdecl)
1614 || (DECL_TI_TEMPLATE (newdecl)
1615 != DECL_TI_TEMPLATE (olddecl))))
1616 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1617 && (!DECL_TEMPLATE_INFO (olddecl)
1618 || (DECL_TI_TEMPLATE (olddecl)
1619 != DECL_TI_TEMPLATE (newdecl))))))
1620 /* It's OK to have a template specialization and a non-template
1621 with the same type, or to have specializations of two
1622 different templates with the same type. Note that if one is a
1623 specialization, and the other is an instantiation of the same
1624 template, that we do not exit at this point. That situation
1625 can occur if we instantiate a template class, and then
1626 specialize one of its methods. This situation is valid, but
1627 the declarations must be merged in the usual way. */
1629 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1630 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1631 && !DECL_USE_TEMPLATE (newdecl))
1632 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1633 && !DECL_USE_TEMPLATE (olddecl))))
1634 /* One of the declarations is a template instantiation, and the
1635 other is not a template at all. That's OK. */
1637 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1639 /* In [namespace.alias] we have:
1641 In a declarative region, a namespace-alias-definition can be
1642 used to redefine a namespace-alias declared in that declarative
1643 region to refer only to the namespace to which it already
1646 Therefore, if we encounter a second alias directive for the same
1647 alias, we can just ignore the second directive. */
1648 if (DECL_NAMESPACE_ALIAS (newdecl)
1649 && (DECL_NAMESPACE_ALIAS (newdecl)
1650 == DECL_NAMESPACE_ALIAS (olddecl)))
1652 /* [namespace.alias]
1654 A namespace-name or namespace-alias shall not be declared as
1655 the name of any other entity in the same declarative region.
1656 A namespace-name defined at global scope shall not be
1657 declared as the name of any other entity in any global scope
1659 error ("conflicting declaration of namespace %qD", newdecl);
1660 inform (DECL_SOURCE_LOCATION (olddecl),
1661 "previous declaration of namespace %qD here", olddecl);
1662 return error_mark_node;
1666 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1669 error_at (DECL_SOURCE_LOCATION (newdecl), errmsg, newdecl);
1670 if (DECL_NAME (olddecl) != NULL_TREE)
1671 inform (input_location,
1672 (DECL_INITIAL (olddecl) && namespace_bindings_p ())
1673 ? G_("%q+#D previously defined here")
1674 : G_("%q+#D previously declared here"), olddecl);
1675 return error_mark_node;
1677 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1678 && DECL_INITIAL (olddecl) != NULL_TREE
1679 && !prototype_p (TREE_TYPE (olddecl))
1680 && prototype_p (TREE_TYPE (newdecl)))
1682 /* Prototype decl follows defn w/o prototype. */
1683 if (warning_at (DECL_SOURCE_LOCATION (newdecl), 0,
1684 "prototype specified for %q#D", newdecl))
1685 inform (DECL_SOURCE_LOCATION (olddecl),
1686 "previous non-prototype definition here");
1688 else if (VAR_OR_FUNCTION_DECL_P (olddecl)
1689 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1692 If two declarations of the same function or object
1693 specify different linkage-specifications ..., the program
1694 is ill-formed.... Except for functions with C++ linkage,
1695 a function declaration without a linkage specification
1696 shall not precede the first linkage specification for
1697 that function. A function can be declared without a
1698 linkage specification after an explicit linkage
1699 specification has been seen; the linkage explicitly
1700 specified in the earlier declaration is not affected by
1701 such a function declaration.
1703 DR 563 raises the question why the restrictions on
1704 functions should not also apply to objects. Older
1705 versions of G++ silently ignore the linkage-specification
1713 which is clearly wrong. Therefore, we now treat objects
1715 if (current_lang_depth () == 0)
1717 /* There is no explicit linkage-specification, so we use
1718 the linkage from the previous declaration. */
1719 if (!DECL_LANG_SPECIFIC (newdecl))
1720 retrofit_lang_decl (newdecl);
1721 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1725 error ("conflicting declaration of %q#D with %qL linkage",
1726 newdecl, DECL_LANGUAGE (newdecl));
1727 inform (DECL_SOURCE_LOCATION (olddecl),
1728 "previous declaration with %qL linkage",
1729 DECL_LANGUAGE (olddecl));
1733 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1735 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1737 /* Note: free functions, as TEMPLATE_DECLs, are handled below. */
1738 if (DECL_FUNCTION_MEMBER_P (olddecl)
1739 && (/* grokfndecl passes member function templates too
1740 as FUNCTION_DECLs. */
1741 DECL_TEMPLATE_INFO (olddecl)
1743 Default arguments for a member function of a class
1744 template shall be specified on the initial declaration
1745 of the member function within the class template. */
1746 || CLASSTYPE_TEMPLATE_INFO (CP_DECL_CONTEXT (olddecl))))
1747 check_redeclaration_no_default_args (newdecl);
1750 tree t1 = FUNCTION_FIRST_USER_PARMTYPE (olddecl);
1751 tree t2 = FUNCTION_FIRST_USER_PARMTYPE (newdecl);
1754 for (; t1 && t1 != void_list_node;
1755 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1756 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1758 if (1 == simple_cst_equal (TREE_PURPOSE (t1),
1761 if (permerror (input_location,
1762 "default argument given for parameter "
1763 "%d of %q#D", i, newdecl))
1764 inform (DECL_SOURCE_LOCATION (olddecl),
1765 "previous specification in %q#D here",
1770 error ("default argument given for parameter %d "
1771 "of %q#D", i, newdecl);
1772 inform (DECL_SOURCE_LOCATION (olddecl),
1773 "previous specification in %q#D here",
1781 /* Do not merge an implicit typedef with an explicit one. In:
1785 typedef class A A __attribute__ ((foo));
1787 the attribute should apply only to the typedef. */
1788 if (TREE_CODE (olddecl) == TYPE_DECL
1789 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1790 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1793 /* If new decl is `static' and an `extern' was seen previously,
1795 warn_extern_redeclared_static (newdecl, olddecl);
1797 if (!validate_constexpr_redeclaration (olddecl, newdecl))
1798 return error_mark_node;
1800 /* We have committed to returning 1 at this point. */
1801 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1803 /* Now that functions must hold information normally held
1804 by field decls, there is extra work to do so that
1805 declaration information does not get destroyed during
1807 if (DECL_VINDEX (olddecl))
1808 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1809 if (DECL_CONTEXT (olddecl))
1810 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1811 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1812 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1813 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1814 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1815 DECL_INVALID_OVERRIDER_P (newdecl) |= DECL_INVALID_OVERRIDER_P (olddecl);
1816 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1817 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1818 SET_OVERLOADED_OPERATOR_CODE
1819 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1820 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1822 /* Optionally warn about more than one declaration for the same
1823 name, but don't warn about a function declaration followed by a
1825 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1826 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1827 /* Don't warn about extern decl followed by definition. */
1828 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1829 /* Don't warn about friends, let add_friend take care of it. */
1830 && ! (newdecl_is_friend || DECL_FRIEND_P (olddecl))
1831 /* Don't warn about declaration followed by specialization. */
1832 && (! DECL_TEMPLATE_SPECIALIZATION (newdecl)
1833 || DECL_TEMPLATE_SPECIALIZATION (olddecl)))
1835 if (warning (OPT_Wredundant_decls,
1836 "redundant redeclaration of %qD in same scope",
1838 inform (DECL_SOURCE_LOCATION (olddecl),
1839 "previous declaration of %qD", olddecl);
1842 if (!(DECL_TEMPLATE_INSTANTIATION (olddecl)
1843 && DECL_TEMPLATE_SPECIALIZATION (newdecl)))
1845 if (DECL_DELETED_FN (newdecl))
1847 error ("deleted definition of %qD", newdecl);
1848 inform (DECL_SOURCE_LOCATION (olddecl),
1849 "previous declaration of %qD", olddecl);
1851 DECL_DELETED_FN (newdecl) |= DECL_DELETED_FN (olddecl);
1855 /* Deal with C++: must preserve virtual function table size. */
1856 if (TREE_CODE (olddecl) == TYPE_DECL)
1858 tree newtype = TREE_TYPE (newdecl);
1859 tree oldtype = TREE_TYPE (olddecl);
1861 if (newtype != error_mark_node && oldtype != error_mark_node
1862 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1863 CLASSTYPE_FRIEND_CLASSES (newtype)
1864 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1866 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1869 /* Copy all the DECL_... slots specified in the new decl
1870 except for any that we copy here from the old type. */
1871 DECL_ATTRIBUTES (newdecl)
1872 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1874 if (DECL_DECLARES_FUNCTION_P (olddecl) && DECL_DECLARES_FUNCTION_P (newdecl))
1876 olddecl_friend = DECL_FRIEND_P (olddecl);
1877 hidden_friend = (DECL_ANTICIPATED (olddecl)
1878 && DECL_HIDDEN_FRIEND_P (olddecl)
1879 && newdecl_is_friend);
1882 DECL_ANTICIPATED (olddecl) = 0;
1883 DECL_HIDDEN_FRIEND_P (olddecl) = 0;
1887 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1891 old_result = DECL_TEMPLATE_RESULT (olddecl);
1892 new_result = DECL_TEMPLATE_RESULT (newdecl);
1893 TREE_TYPE (olddecl) = TREE_TYPE (old_result);
1894 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1895 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1896 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1898 DECL_ATTRIBUTES (old_result)
1899 = (*targetm.merge_decl_attributes) (old_result, new_result);
1901 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1903 /* Per C++11 8.3.6/4, default arguments cannot be added in later
1904 declarations of a function template. */
1905 check_redeclaration_no_default_args (newdecl);
1907 check_default_args (newdecl);
1909 if (GNU_INLINE_P (old_result) != GNU_INLINE_P (new_result)
1910 && DECL_INITIAL (new_result))
1912 if (DECL_INITIAL (old_result))
1913 DECL_UNINLINABLE (old_result) = 1;
1915 DECL_UNINLINABLE (old_result) = DECL_UNINLINABLE (new_result);
1916 DECL_EXTERNAL (old_result) = DECL_EXTERNAL (new_result);
1917 DECL_NOT_REALLY_EXTERN (old_result)
1918 = DECL_NOT_REALLY_EXTERN (new_result);
1919 DECL_INTERFACE_KNOWN (old_result)
1920 = DECL_INTERFACE_KNOWN (new_result);
1921 DECL_DECLARED_INLINE_P (old_result)
1922 = DECL_DECLARED_INLINE_P (new_result);
1923 DECL_DISREGARD_INLINE_LIMITS (old_result)
1924 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1929 DECL_DECLARED_INLINE_P (old_result)
1930 |= DECL_DECLARED_INLINE_P (new_result);
1931 DECL_DISREGARD_INLINE_LIMITS (old_result)
1932 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1933 check_redeclaration_exception_specification (newdecl, olddecl);
1937 /* If the new declaration is a definition, update the file and
1938 line information on the declaration, and also make
1939 the old declaration the same definition. */
1940 if (DECL_INITIAL (new_result) != NULL_TREE)
1942 DECL_SOURCE_LOCATION (olddecl)
1943 = DECL_SOURCE_LOCATION (old_result)
1944 = DECL_SOURCE_LOCATION (newdecl);
1945 DECL_INITIAL (old_result) = DECL_INITIAL (new_result);
1946 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1949 DECL_ARGUMENTS (old_result)
1950 = DECL_ARGUMENTS (new_result);
1951 for (parm = DECL_ARGUMENTS (old_result); parm;
1952 parm = DECL_CHAIN (parm))
1953 DECL_CONTEXT (parm) = old_result;
1962 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1963 check_redeclaration_exception_specification (newdecl, olddecl);
1965 /* Automatically handles default parameters. */
1966 tree oldtype = TREE_TYPE (olddecl);
1969 /* For typedefs use the old type, as the new type's DECL_NAME points
1970 at newdecl, which will be ggc_freed. */
1971 if (TREE_CODE (newdecl) == TYPE_DECL)
1974 /* Merge the data types specified in the two decls. */
1975 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1977 if (VAR_P (newdecl))
1979 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
1980 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
1981 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl)
1982 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl);
1983 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
1984 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
1986 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
1987 if (DECL_LANG_SPECIFIC (olddecl)
1988 && CP_DECL_THREADPRIVATE_P (olddecl))
1990 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
1991 if (!DECL_LANG_SPECIFIC (newdecl))
1992 retrofit_lang_decl (newdecl);
1994 CP_DECL_THREADPRIVATE_P (newdecl) = 1;
1998 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
2000 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2001 check_default_args (newdecl);
2003 /* Lay the type out, unless already done. */
2004 if (! same_type_p (newtype, oldtype)
2005 && TREE_TYPE (newdecl) != error_mark_node
2006 && !(processing_template_decl && uses_template_parms (newdecl)))
2007 layout_type (TREE_TYPE (newdecl));
2009 if ((VAR_P (newdecl)
2010 || TREE_CODE (newdecl) == PARM_DECL
2011 || TREE_CODE (newdecl) == RESULT_DECL
2012 || TREE_CODE (newdecl) == FIELD_DECL
2013 || TREE_CODE (newdecl) == TYPE_DECL)
2014 && !(processing_template_decl && uses_template_parms (newdecl)))
2015 layout_decl (newdecl, 0);
2017 /* Merge the type qualifiers. */
2018 if (TREE_READONLY (newdecl))
2019 TREE_READONLY (olddecl) = 1;
2020 if (TREE_THIS_VOLATILE (newdecl))
2021 TREE_THIS_VOLATILE (olddecl) = 1;
2022 if (TREE_NOTHROW (newdecl))
2023 TREE_NOTHROW (olddecl) = 1;
2025 /* Merge deprecatedness. */
2026 if (TREE_DEPRECATED (newdecl))
2027 TREE_DEPRECATED (olddecl) = 1;
2029 /* Preserve function specific target and optimization options */
2030 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2032 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
2033 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
2034 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
2035 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
2037 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
2038 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
2039 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
2040 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
2043 /* Merge the initialization information. */
2044 if (DECL_INITIAL (newdecl) == NULL_TREE
2045 && DECL_INITIAL (olddecl) != NULL_TREE)
2047 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2048 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
2049 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2051 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
2052 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
2056 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2058 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
2059 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
2060 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
2061 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
2062 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
2063 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
2064 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
2065 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
2066 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
2067 DECL_LOOPING_CONST_OR_PURE_P (newdecl)
2068 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl);
2069 /* Keep the old RTL. */
2070 COPY_DECL_RTL (olddecl, newdecl);
2072 else if (VAR_P (newdecl)
2073 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
2075 /* Keep the old RTL. We cannot keep the old RTL if the old
2076 declaration was for an incomplete object and the new
2077 declaration is not since many attributes of the RTL will
2079 COPY_DECL_RTL (olddecl, newdecl);
2082 /* If cannot merge, then use the new type and qualifiers,
2083 and don't preserve the old rtl. */
2086 /* Clean out any memory we had of the old declaration. */
2087 tree oldstatic = value_member (olddecl, static_aggregates);
2089 TREE_VALUE (oldstatic) = error_mark_node;
2091 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
2092 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
2093 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
2094 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
2097 /* Merge the storage class information. */
2098 merge_weak (newdecl, olddecl);
2100 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
2101 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
2102 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
2103 if (! DECL_EXTERNAL (olddecl))
2104 DECL_EXTERNAL (newdecl) = 0;
2106 new_template_info = NULL_TREE;
2107 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
2109 bool new_redefines_gnu_inline = false;
2111 if (new_defines_function
2112 && ((DECL_INTERFACE_KNOWN (olddecl)
2113 && TREE_CODE (olddecl) == FUNCTION_DECL)
2114 || (TREE_CODE (olddecl) == TEMPLATE_DECL
2115 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
2116 == FUNCTION_DECL))))
2120 if (TREE_CODE (fn) == TEMPLATE_DECL)
2121 fn = DECL_TEMPLATE_RESULT (olddecl);
2123 new_redefines_gnu_inline = GNU_INLINE_P (fn) && DECL_INITIAL (fn);
2126 if (!new_redefines_gnu_inline)
2128 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
2129 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
2130 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
2132 DECL_TEMPLATE_INSTANTIATED (newdecl)
2133 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
2134 DECL_ODR_USED (newdecl) |= DECL_ODR_USED (olddecl);
2136 /* If the OLDDECL is an instantiation and/or specialization,
2137 then the NEWDECL must be too. But, it may not yet be marked
2138 as such if the caller has created NEWDECL, but has not yet
2139 figured out that it is a redeclaration. */
2140 if (!DECL_USE_TEMPLATE (newdecl))
2141 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
2143 /* Don't really know how much of the language-specific
2144 values we should copy from old to new. */
2145 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
2146 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
2147 DECL_INITIALIZED_IN_CLASS_P (newdecl)
2148 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
2150 if (LANG_DECL_HAS_MIN (newdecl))
2152 DECL_LANG_SPECIFIC (newdecl)->u.min.u2 =
2153 DECL_LANG_SPECIFIC (olddecl)->u.min.u2;
2154 if (DECL_TEMPLATE_INFO (newdecl))
2156 new_template_info = DECL_TEMPLATE_INFO (newdecl);
2157 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
2158 && DECL_TEMPLATE_SPECIALIZATION (newdecl))
2159 /* Remember the presence of explicit specialization args. */
2160 TINFO_USED_TEMPLATE_ID (DECL_TEMPLATE_INFO (olddecl))
2161 = TINFO_USED_TEMPLATE_ID (new_template_info);
2163 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
2165 /* Only functions have these fields. */
2166 if (DECL_DECLARES_FUNCTION_P (newdecl))
2168 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
2169 DECL_BEFRIENDING_CLASSES (newdecl)
2170 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
2171 DECL_BEFRIENDING_CLASSES (olddecl));
2172 /* DECL_THUNKS is only valid for virtual functions,
2173 otherwise it is a DECL_FRIEND_CONTEXT. */
2174 if (DECL_VIRTUAL_P (newdecl))
2175 SET_DECL_THUNKS (newdecl, DECL_THUNKS (olddecl));
2177 /* Only variables have this field. */
2178 else if (VAR_P (newdecl)
2179 && VAR_HAD_UNKNOWN_BOUND (olddecl))
2180 SET_VAR_HAD_UNKNOWN_BOUND (newdecl);
2183 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2187 /* Merge parameter attributes. */
2188 tree oldarg, newarg;
2189 for (oldarg = DECL_ARGUMENTS(olddecl),
2190 newarg = DECL_ARGUMENTS(newdecl);
2192 oldarg = DECL_CHAIN(oldarg), newarg = DECL_CHAIN(newarg)) {
2193 DECL_ATTRIBUTES (newarg)
2194 = (*targetm.merge_decl_attributes) (oldarg, newarg);
2195 DECL_ATTRIBUTES (oldarg) = DECL_ATTRIBUTES (newarg);
2198 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
2199 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
2201 /* If newdecl is not a specialization, then it is not a
2202 template-related function at all. And that means that we
2203 should have exited above, returning 0. */
2204 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
2206 if (DECL_ODR_USED (olddecl))
2207 /* From [temp.expl.spec]:
2209 If a template, a member template or the member of a class
2210 template is explicitly specialized then that
2211 specialization shall be declared before the first use of
2212 that specialization that would cause an implicit
2213 instantiation to take place, in every translation unit in
2214 which such a use occurs. */
2215 error ("explicit specialization of %qD after first use",
2218 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
2219 DECL_COMDAT (newdecl) = (TREE_PUBLIC (newdecl)
2220 && DECL_DECLARED_INLINE_P (newdecl));
2222 /* Don't propagate visibility from the template to the
2223 specialization here. We'll do that in determine_visibility if
2225 DECL_VISIBILITY_SPECIFIED (olddecl) = 0;
2227 /* [temp.expl.spec/14] We don't inline explicit specialization
2228 just because the primary template says so. */
2230 /* But still keep DECL_DISREGARD_INLINE_LIMITS in sync with
2231 the always_inline attribute. */
2232 if (DECL_DISREGARD_INLINE_LIMITS (olddecl)
2233 && !DECL_DISREGARD_INLINE_LIMITS (newdecl))
2235 if (DECL_DECLARED_INLINE_P (newdecl))
2236 DECL_DISREGARD_INLINE_LIMITS (newdecl) = true;
2238 DECL_ATTRIBUTES (newdecl)
2239 = remove_attribute ("always_inline",
2240 DECL_ATTRIBUTES (newdecl));
2243 else if (new_defines_function && DECL_INITIAL (olddecl))
2245 /* Never inline re-defined extern inline functions.
2246 FIXME: this could be better handled by keeping both
2247 function as separate declarations. */
2248 DECL_UNINLINABLE (newdecl) = 1;
2252 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
2253 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
2255 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
2257 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
2258 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
2260 DECL_DISREGARD_INLINE_LIMITS (newdecl)
2261 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
2262 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
2263 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
2266 /* Preserve abstractness on cloned [cd]tors. */
2267 DECL_ABSTRACT_P (newdecl) = DECL_ABSTRACT_P (olddecl);
2269 /* Update newdecl's parms to point at olddecl. */
2270 for (parm = DECL_ARGUMENTS (newdecl); parm;
2271 parm = DECL_CHAIN (parm))
2272 DECL_CONTEXT (parm) = olddecl;
2276 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
2277 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
2278 COPY_DECL_RTL (newdecl, olddecl);
2280 if (! types_match || new_defines_function)
2282 /* These need to be copied so that the names are available.
2283 Note that if the types do match, we'll preserve inline
2284 info and other bits, but if not, we won't. */
2285 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
2286 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
2288 /* If redeclaring a builtin function, it stays built in
2289 if newdecl is a gnu_inline definition, or if newdecl is just
2291 if (DECL_BUILT_IN (olddecl)
2292 && (new_defines_function ? GNU_INLINE_P (newdecl) : types_match))
2294 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2295 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2296 /* If we're keeping the built-in definition, keep the rtl,
2297 regardless of declaration matches. */
2298 COPY_DECL_RTL (olddecl, newdecl);
2299 if (DECL_BUILT_IN_CLASS (newdecl) == BUILT_IN_NORMAL)
2301 enum built_in_function fncode = DECL_FUNCTION_CODE (newdecl);
2304 /* If a compatible prototype of these builtin functions
2305 is seen, assume the runtime implements it with the
2306 expected semantics. */
2307 case BUILT_IN_STPCPY:
2308 if (builtin_decl_explicit_p (fncode))
2309 set_builtin_decl_implicit_p (fncode, true);
2312 if (builtin_decl_explicit_p (fncode))
2313 set_builtin_decl_declared_p (fncode, true);
2318 if (new_defines_function)
2319 /* If defining a function declared with other language
2320 linkage, use the previously declared language linkage. */
2321 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
2322 else if (types_match)
2324 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2325 /* Don't clear out the arguments if we're just redeclaring a
2327 if (DECL_ARGUMENTS (olddecl))
2328 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2331 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
2332 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
2334 /* Now preserve various other info from the definition. */
2335 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
2336 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
2337 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2338 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2340 /* Warn about conflicting visibility specifications. */
2341 if (DECL_VISIBILITY_SPECIFIED (olddecl)
2342 && DECL_VISIBILITY_SPECIFIED (newdecl)
2343 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2345 if (warning_at (DECL_SOURCE_LOCATION (newdecl), OPT_Wattributes,
2346 "%qD: visibility attribute ignored because it "
2347 "conflicts with previous declaration", newdecl))
2348 inform (DECL_SOURCE_LOCATION (olddecl),
2349 "previous declaration of %qD", olddecl);
2351 /* Choose the declaration which specified visibility. */
2352 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2354 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2355 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2357 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2358 so keep this behavior. */
2359 if (VAR_P (newdecl) && DECL_HAS_INIT_PRIORITY_P (newdecl))
2361 SET_DECL_INIT_PRIORITY (olddecl, DECL_INIT_PRIORITY (newdecl));
2362 DECL_HAS_INIT_PRIORITY_P (olddecl) = 1;
2364 /* Likewise for DECL_ALIGN, DECL_USER_ALIGN and DECL_PACKED. */
2365 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
2367 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
2368 DECL_USER_ALIGN (newdecl) |= DECL_USER_ALIGN (olddecl);
2370 DECL_USER_ALIGN (olddecl) = DECL_USER_ALIGN (newdecl);
2371 if (TREE_CODE (newdecl) == FIELD_DECL)
2372 DECL_PACKED (olddecl) = DECL_PACKED (newdecl);
2374 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2375 with that from NEWDECL below. */
2376 if (DECL_LANG_SPECIFIC (olddecl))
2378 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
2379 != DECL_LANG_SPECIFIC (newdecl));
2380 ggc_free (DECL_LANG_SPECIFIC (olddecl));
2383 /* Merge the USED information. */
2384 if (TREE_USED (olddecl))
2385 TREE_USED (newdecl) = 1;
2386 else if (TREE_USED (newdecl))
2387 TREE_USED (olddecl) = 1;
2388 if (VAR_P (newdecl))
2390 if (DECL_READ_P (olddecl))
2391 DECL_READ_P (newdecl) = 1;
2392 else if (DECL_READ_P (newdecl))
2393 DECL_READ_P (olddecl) = 1;
2395 if (DECL_PRESERVE_P (olddecl))
2396 DECL_PRESERVE_P (newdecl) = 1;
2397 else if (DECL_PRESERVE_P (newdecl))
2398 DECL_PRESERVE_P (olddecl) = 1;
2400 /* Merge the DECL_FUNCTION_VERSIONED information. newdecl will be copied
2401 to olddecl and deleted. */
2402 if (TREE_CODE (newdecl) == FUNCTION_DECL
2403 && DECL_FUNCTION_VERSIONED (olddecl))
2405 /* Set the flag for newdecl so that it gets copied to olddecl. */
2406 DECL_FUNCTION_VERSIONED (newdecl) = 1;
2407 /* newdecl will be purged after copying to olddecl and is no longer
2409 cgraph_node::delete_function_version (newdecl);
2412 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2415 struct symtab_node *snode = symtab_node::get (olddecl);
2417 function_size = sizeof (struct tree_decl_common);
2419 memcpy ((char *) olddecl + sizeof (struct tree_common),
2420 (char *) newdecl + sizeof (struct tree_common),
2421 function_size - sizeof (struct tree_common));
2423 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2424 (char *) newdecl + sizeof (struct tree_decl_common),
2425 sizeof (struct tree_function_decl) - sizeof (struct tree_decl_common));
2427 /* Preserve symtab node mapping. */
2428 olddecl->decl_with_vis.symtab_node = snode;
2430 if (new_template_info)
2431 /* If newdecl is a template instantiation, it is possible that
2432 the following sequence of events has occurred:
2434 o A friend function was declared in a class template. The
2435 class template was instantiated.
2437 o The instantiation of the friend declaration was
2438 recorded on the instantiation list, and is newdecl.
2440 o Later, however, instantiate_class_template called pushdecl
2441 on the newdecl to perform name injection. But, pushdecl in
2442 turn called duplicate_decls when it discovered that another
2443 declaration of a global function with the same name already
2446 o Here, in duplicate_decls, we decided to clobber newdecl.
2448 If we're going to do that, we'd better make sure that
2449 olddecl, and not newdecl, is on the list of
2450 instantiations so that if we try to do the instantiation
2451 again we won't get the clobbered declaration. */
2452 reregister_specialization (newdecl,
2458 size_t size = tree_code_size (TREE_CODE (newdecl));
2460 memcpy ((char *) olddecl + sizeof (struct tree_common),
2461 (char *) newdecl + sizeof (struct tree_common),
2462 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2463 switch (TREE_CODE (newdecl))
2473 struct symtab_node *snode = NULL;
2475 if (TREE_CODE (newdecl) == VAR_DECL
2476 && (TREE_STATIC (olddecl) || TREE_PUBLIC (olddecl) || DECL_EXTERNAL (olddecl)))
2477 snode = symtab_node::get (olddecl);
2478 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2479 (char *) newdecl + sizeof (struct tree_decl_common),
2480 size - sizeof (struct tree_decl_common)
2481 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2482 if (TREE_CODE (newdecl) == VAR_DECL)
2483 olddecl->decl_with_vis.symtab_node = snode;
2487 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2488 (char *) newdecl + sizeof (struct tree_decl_common),
2489 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)
2490 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2495 if (TREE_CODE (newdecl) == FUNCTION_DECL
2496 || TREE_CODE (newdecl) == VAR_DECL)
2498 if (DECL_EXTERNAL (olddecl)
2499 || TREE_PUBLIC (olddecl)
2500 || TREE_STATIC (olddecl))
2502 /* Merge the section attribute.
2503 We want to issue an error if the sections conflict but that must be
2504 done later in decl_attributes since we are called before attributes
2506 if (DECL_SECTION_NAME (newdecl) != NULL)
2507 set_decl_section_name (olddecl, DECL_SECTION_NAME (newdecl));
2509 if (DECL_ONE_ONLY (newdecl))
2511 struct symtab_node *oldsym, *newsym;
2512 if (TREE_CODE (olddecl) == FUNCTION_DECL)
2513 oldsym = cgraph_node::get_create (olddecl);
2515 oldsym = varpool_node::get_create (olddecl);
2516 newsym = symtab_node::get (newdecl);
2517 oldsym->set_comdat_group (newsym->get_comdat_group ());
2521 if (TREE_CODE (newdecl) == VAR_DECL
2522 && DECL_THREAD_LOCAL_P (newdecl))
2523 set_decl_tls_model (olddecl, DECL_TLS_MODEL (newdecl));
2526 DECL_UID (olddecl) = olddecl_uid;
2528 DECL_FRIEND_P (olddecl) = 1;
2531 DECL_ANTICIPATED (olddecl) = 1;
2532 DECL_HIDDEN_FRIEND_P (olddecl) = 1;
2535 /* NEWDECL contains the merged attribute lists.
2536 Update OLDDECL to be the same. */
2537 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2539 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2540 so that encode_section_info has a chance to look at the new decl
2541 flags and attributes. */
2542 if (DECL_RTL_SET_P (olddecl)
2543 && (TREE_CODE (olddecl) == FUNCTION_DECL
2545 && TREE_STATIC (olddecl))))
2546 make_decl_rtl (olddecl);
2548 /* The NEWDECL will no longer be needed. Because every out-of-class
2549 declaration of a member results in a call to duplicate_decls,
2550 freeing these nodes represents in a significant savings.
2552 Before releasing the node, be sore to remove function from symbol
2553 table that might have been inserted there to record comdat group.
2554 Be sure to however do not free DECL_STRUCT_FUNCTION becuase this
2555 structure is shared in between newdecl and oldecl. */
2556 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2557 DECL_STRUCT_FUNCTION (newdecl) = NULL;
2558 if (TREE_CODE (newdecl) == FUNCTION_DECL
2559 || TREE_CODE (newdecl) == VAR_DECL)
2561 struct symtab_node *snode = symtab_node::get (newdecl);
2570 /* Return zero if the declaration NEWDECL is valid
2571 when the declaration OLDDECL (assumed to be for the same name)
2572 has already been seen.
2573 Otherwise return an error message format string with a %s
2574 where the identifier should go. */
2577 redeclaration_error_message (tree newdecl, tree olddecl)
2579 if (TREE_CODE (newdecl) == TYPE_DECL)
2581 /* Because C++ can put things into name space for free,
2582 constructs like "typedef struct foo { ... } foo"
2583 would look like an erroneous redeclaration. */
2584 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
2587 return G_("redefinition of %q#D");
2589 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2591 /* If this is a pure function, its olddecl will actually be
2592 the original initialization to `0' (which we force to call
2593 abort()). Don't complain about redefinition in this case. */
2594 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
2595 && DECL_INITIAL (olddecl) == NULL_TREE)
2598 /* If both functions come from different namespaces, this is not
2599 a redeclaration - this is a conflict with a used function. */
2600 if (DECL_NAMESPACE_SCOPE_P (olddecl)
2601 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
2602 && ! decls_match (olddecl, newdecl))
2603 return G_("%qD conflicts with used function");
2605 /* We'll complain about linkage mismatches in
2606 warn_extern_redeclared_static. */
2608 /* Defining the same name twice is no good. */
2609 if (DECL_INITIAL (olddecl) != NULL_TREE
2610 && DECL_INITIAL (newdecl) != NULL_TREE)
2612 if (DECL_NAME (olddecl) == NULL_TREE)
2613 return G_("%q#D not declared in class");
2614 else if (!GNU_INLINE_P (olddecl)
2615 || GNU_INLINE_P (newdecl))
2616 return G_("redefinition of %q#D");
2619 if (DECL_DECLARED_INLINE_P (olddecl) && DECL_DECLARED_INLINE_P (newdecl))
2621 bool olda = GNU_INLINE_P (olddecl);
2622 bool newa = GNU_INLINE_P (newdecl);
2627 return G_("%q+D redeclared inline with "
2628 "%<gnu_inline%> attribute");
2630 return G_("%q+D redeclared inline without "
2631 "%<gnu_inline%> attribute");
2635 check_abi_tag_redeclaration
2636 (olddecl, lookup_attribute ("abi_tag", DECL_ATTRIBUTES (olddecl)),
2637 lookup_attribute ("abi_tag", DECL_ATTRIBUTES (newdecl)));
2641 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
2645 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
2647 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
2648 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
2649 return G_("redefinition of %q#D");
2653 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
2654 || (DECL_TEMPLATE_RESULT (newdecl)
2655 == DECL_TEMPLATE_RESULT (olddecl)))
2658 nt = DECL_TEMPLATE_RESULT (newdecl);
2659 if (DECL_TEMPLATE_INFO (nt))
2660 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
2661 ot = DECL_TEMPLATE_RESULT (olddecl);
2662 if (DECL_TEMPLATE_INFO (ot))
2663 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
2664 if (DECL_INITIAL (nt) && DECL_INITIAL (ot)
2665 && (!GNU_INLINE_P (ot) || GNU_INLINE_P (nt)))
2666 return G_("redefinition of %q#D");
2668 if (DECL_DECLARED_INLINE_P (ot) && DECL_DECLARED_INLINE_P (nt))
2670 bool olda = GNU_INLINE_P (ot);
2671 bool newa = GNU_INLINE_P (nt);
2676 return G_("%q+D redeclared inline with "
2677 "%<gnu_inline%> attribute");
2679 return G_("%q+D redeclared inline without "
2680 "%<gnu_inline%> attribute");
2684 /* Core issue #226 (C++0x):
2686 If a friend function template declaration specifies a
2687 default template-argument, that declaration shall be a
2688 definition and shall be the only declaration of the
2689 function template in the translation unit. */
2690 if ((cxx_dialect != cxx98)
2691 && TREE_CODE (ot) == FUNCTION_DECL && DECL_FRIEND_P (ot)
2692 && !check_default_tmpl_args (nt, DECL_TEMPLATE_PARMS (newdecl),
2693 /*is_primary=*/true,
2694 /*is_partial=*/false,
2695 /*is_friend_decl=*/2))
2696 return G_("redeclaration of friend %q#D "
2697 "may not have default template arguments");
2701 else if (VAR_P (newdecl)
2702 && DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl)
2703 && (! DECL_LANG_SPECIFIC (olddecl)
2704 || ! CP_DECL_THREADPRIVATE_P (olddecl)
2705 || DECL_THREAD_LOCAL_P (newdecl)))
2707 /* Only variables can be thread-local, and all declarations must
2708 agree on this property. */
2709 if (DECL_THREAD_LOCAL_P (newdecl))
2710 return G_("thread-local declaration of %q#D follows "
2711 "non-thread-local declaration");
2713 return G_("non-thread-local declaration of %q#D follows "
2714 "thread-local declaration");
2716 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2718 /* The objects have been declared at namespace scope. If either
2719 is a member of an anonymous union, then this is an invalid
2720 redeclaration. For example:
2726 if ((VAR_P (newdecl) && DECL_ANON_UNION_VAR_P (newdecl))
2727 || (VAR_P (olddecl) && DECL_ANON_UNION_VAR_P (olddecl)))
2728 return G_("redeclaration of %q#D");
2729 /* If at least one declaration is a reference, there is no
2730 conflict. For example:
2736 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2738 /* Reject two definitions. */
2739 return G_("redefinition of %q#D");
2743 /* Objects declared with block scope: */
2744 /* Reject two definitions, and reject a definition
2745 together with an external reference. */
2746 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2747 return G_("redeclaration of %q#D");
2752 /* Hash and equality functions for the named_label table. */
2755 named_label_hasher::hash (named_label_entry *ent)
2757 return DECL_UID (ent->label_decl);
2761 named_label_hasher::equal (named_label_entry *a, named_label_entry *b)
2763 return a->label_decl == b->label_decl;
2766 /* Create a new label, named ID. */
2769 make_label_decl (tree id, int local_p)
2771 struct named_label_entry *ent;
2774 decl = build_decl (input_location, LABEL_DECL, id, void_type_node);
2776 DECL_CONTEXT (decl) = current_function_decl;
2777 DECL_MODE (decl) = VOIDmode;
2778 C_DECLARED_LABEL_FLAG (decl) = local_p;
2780 /* Say where one reference is to the label, for the sake of the
2781 error if it is not defined. */
2782 DECL_SOURCE_LOCATION (decl) = input_location;
2784 /* Record the fact that this identifier is bound to this label. */
2785 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2787 /* Create the label htab for the function on demand. */
2789 named_labels = hash_table<named_label_hasher>::create_ggc (13);
2791 /* Record this label on the list of labels used in this function.
2792 We do this before calling make_label_decl so that we get the
2793 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2794 ent = ggc_cleared_alloc<named_label_entry> ();
2795 ent->label_decl = decl;
2797 named_label_entry **slot = named_labels->find_slot (ent, INSERT);
2798 gcc_assert (*slot == NULL);
2804 /* Look for a label named ID in the current function. If one cannot
2805 be found, create one. (We keep track of used, but undefined,
2806 labels, and complain about them at the end of a function.) */
2809 lookup_label_1 (tree id)
2813 /* You can't use labels at global scope. */
2814 if (current_function_decl == NULL_TREE)
2816 error ("label %qE referenced outside of any function", id);
2820 /* See if we've already got this label. */
2821 decl = IDENTIFIER_LABEL_VALUE (id);
2822 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2825 decl = make_label_decl (id, /*local_p=*/0);
2829 /* Wrapper for lookup_label_1. */
2832 lookup_label (tree id)
2835 bool subtime = timevar_cond_start (TV_NAME_LOOKUP);
2836 ret = lookup_label_1 (id);
2837 timevar_cond_stop (TV_NAME_LOOKUP, subtime);
2841 /* Declare a local label named ID. */
2844 declare_local_label (tree id)
2847 cp_label_binding bind;
2849 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2850 this scope we can restore the old value of IDENTIFIER_TYPE_VALUE. */
2851 bind.prev_value = IDENTIFIER_LABEL_VALUE (id);
2853 decl = make_label_decl (id, /*local_p=*/1);
2855 vec_safe_push (current_binding_level->shadowed_labels, bind);
2860 /* Returns nonzero if it is ill-formed to jump past the declaration of
2861 DECL. Returns 2 if it's also a real problem. */
2864 decl_jump_unsafe (tree decl)
2866 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
2867 with automatic storage duration is not in scope to a point where it is
2868 in scope is ill-formed unless the variable has scalar type, class type
2869 with a trivial default constructor and a trivial destructor, a
2870 cv-qualified version of one of these types, or an array of one of the
2871 preceding types and is declared without an initializer (8.5). */
2872 tree type = TREE_TYPE (decl);
2874 if (!VAR_P (decl) || TREE_STATIC (decl)
2875 || type == error_mark_node)
2878 if (DECL_NONTRIVIALLY_INITIALIZED_P (decl)
2879 || variably_modified_type_p (type, NULL_TREE))
2882 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
2888 /* A subroutine of check_previous_goto_1 to identify a branch to the user. */
2891 identify_goto (tree decl, const location_t *locus)
2893 bool complained = (decl
2894 ? permerror (input_location, "jump to label %qD", decl)
2895 : permerror (input_location, "jump to case label"));
2896 if (complained && locus)
2897 inform (*locus, " from here");
2901 /* Check that a single previously seen jump to a newly defined label
2902 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2903 the jump context; NAMES are the names in scope in LEVEL at the jump
2904 context; LOCUS is the source position of the jump or 0. Returns
2905 true if all is well. */
2908 check_previous_goto_1 (tree decl, cp_binding_level* level, tree names,
2909 bool exited_omp, const location_t *locus)
2911 cp_binding_level *b;
2912 bool identified = false, complained = false;
2913 bool saw_eh = false, saw_omp = false;
2917 complained = identify_goto (decl, locus);
2919 inform (input_location, " exits OpenMP structured block");
2920 identified = saw_omp = true;
2923 for (b = current_binding_level; b ; b = b->level_chain)
2925 tree new_decls, old_decls = (b == level ? names : NULL_TREE);
2927 for (new_decls = b->names; new_decls != old_decls;
2928 new_decls = (DECL_P (new_decls) ? DECL_CHAIN (new_decls)
2929 : TREE_CHAIN (new_decls)))
2931 int problem = decl_jump_unsafe (new_decls);
2937 complained = identify_goto (decl, locus);
2943 inform (input_location,
2944 " crosses initialization of %q+#D", new_decls);
2946 inform (input_location, " enters scope of %q+#D which has "
2947 "non-trivial destructor", new_decls);
2953 if ((b->kind == sk_try || b->kind == sk_catch) && !saw_eh)
2957 complained = identify_goto (decl, locus);
2962 if (b->kind == sk_try)
2963 inform (input_location, " enters try block");
2965 inform (input_location, " enters catch block");
2969 if (b->kind == sk_omp && !saw_omp)
2973 complained = identify_goto (decl, locus);
2977 inform (input_location, " enters OpenMP structured block");
2986 check_previous_goto (tree decl, struct named_label_use_entry *use)
2988 check_previous_goto_1 (decl, use->binding_level,
2989 use->names_in_scope, use->in_omp_scope,
2990 &use->o_goto_locus);
2994 check_switch_goto (cp_binding_level* level)
2996 return check_previous_goto_1 (NULL_TREE, level, level->names, false, NULL);
2999 /* Check that a new jump to a label DECL is OK. Called by
3000 finish_goto_stmt. */
3003 check_goto (tree decl)
3005 struct named_label_entry *ent, dummy;
3006 bool saw_catch = false, identified = false, complained = false;
3010 /* We can't know where a computed goto is jumping.
3011 So we assume that it's OK. */
3012 if (TREE_CODE (decl) != LABEL_DECL)
3015 /* We didn't record any information about this label when we created it,
3016 and there's not much point since it's trivial to analyze as a return. */
3017 if (decl == cdtor_label)
3020 dummy.label_decl = decl;
3021 ent = named_labels->find (&dummy);
3022 gcc_assert (ent != NULL);
3024 /* If the label hasn't been defined yet, defer checking. */
3025 if (! DECL_INITIAL (decl))
3027 struct named_label_use_entry *new_use;
3029 /* Don't bother creating another use if the last goto had the
3030 same data, and will therefore create the same set of errors. */
3032 && ent->uses->names_in_scope == current_binding_level->names)
3035 new_use = ggc_alloc<named_label_use_entry> ();
3036 new_use->binding_level = current_binding_level;
3037 new_use->names_in_scope = current_binding_level->names;
3038 new_use->o_goto_locus = input_location;
3039 new_use->in_omp_scope = false;
3041 new_use->next = ent->uses;
3042 ent->uses = new_use;
3046 if (ent->in_try_scope || ent->in_catch_scope
3047 || ent->in_omp_scope || !vec_safe_is_empty (ent->bad_decls))
3049 complained = permerror (input_location, "jump to label %q+D", decl);
3051 inform (input_location, " from here");
3055 FOR_EACH_VEC_SAFE_ELT (ent->bad_decls, ix, bad)
3057 int u = decl_jump_unsafe (bad);
3059 if (u > 1 && DECL_ARTIFICIAL (bad))
3061 /* Can't skip init of __exception_info. */
3063 inform (DECL_SOURCE_LOCATION (bad), " enters catch block");
3066 else if (complained)
3069 inform (input_location, " skips initialization of %q+#D", bad);
3071 inform (input_location, " enters scope of %q+#D which has "
3072 "non-trivial destructor", bad);
3078 if (ent->in_try_scope)
3079 inform (input_location, " enters try block");
3080 else if (ent->in_catch_scope && !saw_catch)
3081 inform (input_location, " enters catch block");
3084 if (ent->in_omp_scope)
3087 inform (input_location, " enters OpenMP structured block");
3089 else if (flag_openmp)
3091 cp_binding_level *b;
3092 for (b = current_binding_level; b ; b = b->level_chain)
3094 if (b == ent->binding_level)
3096 if (b->kind == sk_omp)
3100 complained = permerror (input_location,
3101 "jump to label %q+D", decl);
3103 inform (input_location, " from here");
3107 inform (input_location, " exits OpenMP structured block");
3114 /* Check that a return is ok wrt OpenMP structured blocks.
3115 Called by finish_return_stmt. Returns true if all is well. */
3118 check_omp_return (void)
3120 cp_binding_level *b;
3121 for (b = current_binding_level; b ; b = b->level_chain)
3122 if (b->kind == sk_omp)
3124 error ("invalid exit from OpenMP structured block");
3127 else if (b->kind == sk_function_parms)
3132 /* Define a label, specifying the location in the source file.
3133 Return the LABEL_DECL node for the label. */
3136 define_label_1 (location_t location, tree name)
3138 struct named_label_entry *ent, dummy;
3139 cp_binding_level *p;
3142 decl = lookup_label (name);
3144 dummy.label_decl = decl;
3145 ent = named_labels->find (&dummy);
3146 gcc_assert (ent != NULL);
3148 /* After labels, make any new cleanups in the function go into their
3149 own new (temporary) binding contour. */
3150 for (p = current_binding_level;
3151 p->kind != sk_function_parms;
3153 p->more_cleanups_ok = 0;
3155 if (name == get_identifier ("wchar_t"))
3156 permerror (input_location, "label named wchar_t");
3158 if (DECL_INITIAL (decl) != NULL_TREE)
3160 error ("duplicate label %qD", decl);
3161 return error_mark_node;
3165 struct named_label_use_entry *use;
3167 /* Mark label as having been defined. */
3168 DECL_INITIAL (decl) = error_mark_node;
3169 /* Say where in the source. */
3170 DECL_SOURCE_LOCATION (decl) = location;
3172 ent->binding_level = current_binding_level;
3173 ent->names_in_scope = current_binding_level->names;
3175 for (use = ent->uses; use ; use = use->next)
3176 check_previous_goto (decl, use);
3183 /* Wrapper for define_label_1. */
3186 define_label (location_t location, tree name)
3189 bool running = timevar_cond_start (TV_NAME_LOOKUP);
3190 ret = define_label_1 (location, name);
3191 timevar_cond_stop (TV_NAME_LOOKUP, running);
3198 cp_binding_level *level;
3199 struct cp_switch *next;
3200 /* The SWITCH_STMT being built. */
3202 /* A splay-tree mapping the low element of a case range to the high
3203 element, or NULL_TREE if there is no high element. Used to
3204 determine whether or not a new case label duplicates an old case
3205 label. We need a tree, rather than simply a hash table, because
3206 of the GNU case range extension. */
3210 /* A stack of the currently active switch statements. The innermost
3211 switch statement is on the top of the stack. There is no need to
3212 mark the stack for garbage collection because it is only active
3213 during the processing of the body of a function, and we never
3214 collect at that point. */
3216 static struct cp_switch *switch_stack;
3218 /* Called right after a switch-statement condition is parsed.
3219 SWITCH_STMT is the switch statement being parsed. */
3222 push_switch (tree switch_stmt)
3224 struct cp_switch *p = XNEW (struct cp_switch);
3225 p->level = current_binding_level;
3226 p->next = switch_stack;
3227 p->switch_stmt = switch_stmt;
3228 p->cases = splay_tree_new (case_compare, NULL, NULL);
3235 struct cp_switch *cs = switch_stack;
3236 location_t switch_location;
3238 /* Emit warnings as needed. */
3239 switch_location = EXPR_LOC_OR_LOC (cs->switch_stmt, input_location);
3240 if (!processing_template_decl)
3241 c_do_switch_warnings (cs->cases, switch_location,
3242 SWITCH_STMT_TYPE (cs->switch_stmt),
3243 SWITCH_STMT_COND (cs->switch_stmt));
3245 splay_tree_delete (cs->cases);
3246 switch_stack = switch_stack->next;
3250 /* Convert a case constant VALUE in a switch to the type TYPE of the switch
3251 condition. Note that if TYPE and VALUE are already integral we don't
3252 really do the conversion because the language-independent
3253 warning/optimization code will work better that way. */
3256 case_conversion (tree type, tree value)
3258 if (value == NULL_TREE)
3261 if (cxx_dialect >= cxx11
3262 && (SCOPED_ENUM_P (type)
3263 || !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (value))))
3265 if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
3266 type = type_promotes_to (type);
3267 value = (perform_implicit_conversion_flags
3268 (type, value, tf_warning_or_error,
3269 LOOKUP_IMPLICIT | LOOKUP_NO_NON_INTEGRAL));
3271 return cxx_constant_value (value);
3274 /* Note that we've seen a definition of a case label, and complain if this
3275 is a bad place for one. */
3278 finish_case_label (location_t loc, tree low_value, tree high_value)
3281 cp_binding_level *p;
3284 if (processing_template_decl)
3288 /* For templates, just add the case label; we'll do semantic
3289 analysis at instantiation-time. */
3290 label = build_decl (loc, LABEL_DECL, NULL_TREE, NULL_TREE);
3291 return add_stmt (build_case_label (low_value, high_value, label));
3294 /* Find the condition on which this switch statement depends. */
3295 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
3296 if (cond && TREE_CODE (cond) == TREE_LIST)
3297 cond = TREE_VALUE (cond);
3299 if (!check_switch_goto (switch_stack->level))
3300 return error_mark_node;
3302 type = SWITCH_STMT_TYPE (switch_stack->switch_stmt);
3304 low_value = case_conversion (type, low_value);
3305 high_value = case_conversion (type, high_value);
3307 r = c_add_case_label (loc, switch_stack->cases, cond, type,
3308 low_value, high_value);
3310 /* After labels, make any new cleanups in the function go into their
3311 own new (temporary) binding contour. */
3312 for (p = current_binding_level;
3313 p->kind != sk_function_parms;
3315 p->more_cleanups_ok = 0;
3320 struct typename_info {
3328 struct typename_hasher : ggc_hasher<tree>
3330 typedef typename_info *compare_type;
3332 /* Hash a TYPENAME_TYPE. */
3339 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
3340 ^ htab_hash_pointer (TYPE_IDENTIFIER (t)));
3345 /* Compare two TYPENAME_TYPEs. */
3348 equal (tree t1, const typename_info *t2)
3350 return (TYPE_IDENTIFIER (t1) == t2->name
3351 && TYPE_CONTEXT (t1) == t2->scope
3352 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
3353 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
3354 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
3358 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
3359 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
3361 Returns the new TYPENAME_TYPE. */
3363 static GTY (()) hash_table<typename_hasher> *typename_htab;
3366 build_typename_type (tree context, tree name, tree fullname,
3367 enum tag_types tag_type)
3375 if (typename_htab == NULL)
3376 typename_htab = hash_table<typename_hasher>::create_ggc (61);
3378 ti.scope = FROB_CONTEXT (context);
3380 ti.template_id = fullname;
3381 ti.enum_p = tag_type == enum_type;
3382 ti.class_p = (tag_type == class_type
3383 || tag_type == record_type
3384 || tag_type == union_type);
3385 hash = (htab_hash_pointer (ti.scope)
3386 ^ htab_hash_pointer (ti.name));
3388 /* See if we already have this type. */
3389 e = typename_htab->find_slot_with_hash (&ti, hash, INSERT);
3394 /* Build the TYPENAME_TYPE. */
3395 t = cxx_make_type (TYPENAME_TYPE);
3396 TYPE_CONTEXT (t) = ti.scope;
3397 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
3398 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
3399 TYPENAME_IS_CLASS_P (t) = ti.class_p;
3401 /* Build the corresponding TYPE_DECL. */
3402 d = build_decl (input_location, TYPE_DECL, name, t);
3403 TYPE_NAME (TREE_TYPE (d)) = d;
3404 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3405 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3406 DECL_ARTIFICIAL (d) = 1;
3408 /* Store it in the hash table. */
3411 /* TYPENAME_TYPEs must always be compared structurally, because
3412 they may or may not resolve down to another type depending on
3413 the currently open classes. */
3414 SET_TYPE_STRUCTURAL_EQUALITY (t);
3420 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
3421 provided to name the type. Returns an appropriate type, unless an
3422 error occurs, in which case error_mark_node is returned. If we
3423 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
3424 return that, rather than the _TYPE it corresponds to, in other
3425 cases we look through the type decl. If TF_ERROR is set, complain
3426 about errors, otherwise be quiet. */
3429 make_typename_type (tree context, tree name, enum tag_types tag_type,
3430 tsubst_flags_t complain)
3436 if (name == error_mark_node
3437 || context == NULL_TREE
3438 || context == error_mark_node)
3439 return error_mark_node;
3443 if (!(TYPE_LANG_SPECIFIC (name)
3444 && (CLASSTYPE_IS_TEMPLATE (name)
3445 || CLASSTYPE_USE_TEMPLATE (name))))
3446 name = TYPE_IDENTIFIER (name);
3448 /* Create a TEMPLATE_ID_EXPR for the type. */
3449 name = build_nt (TEMPLATE_ID_EXPR,
3450 CLASSTYPE_TI_TEMPLATE (name),
3451 CLASSTYPE_TI_ARGS (name));
3453 else if (TREE_CODE (name) == TYPE_DECL)
3454 name = DECL_NAME (name);
3458 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
3460 name = TREE_OPERAND (name, 0);
3461 if (TREE_CODE (name) == TEMPLATE_DECL)
3462 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
3463 else if (TREE_CODE (name) == OVERLOAD)
3465 if (complain & tf_error)
3466 error ("%qD is not a type", name);
3467 return error_mark_node;
3470 if (TREE_CODE (name) == TEMPLATE_DECL)
3472 if (complain & tf_error)
3473 error ("%qD used without template parameters", name);
3474 return error_mark_node;
3476 gcc_assert (identifier_p (name));
3477 gcc_assert (TYPE_P (context));
3479 if (!MAYBE_CLASS_TYPE_P (context))
3481 if (complain & tf_error)
3482 error ("%q#T is not a class", context);
3483 return error_mark_node;
3486 /* When the CONTEXT is a dependent type, NAME could refer to a
3487 dependent base class of CONTEXT. But look inside it anyway
3488 if CONTEXT is a currently open scope, in case it refers to a
3489 member of the current instantiation or a non-dependent base;
3490 lookup will stop when we hit a dependent base. */
3491 if (!dependent_scope_p (context))
3492 /* We should only set WANT_TYPE when we're a nested typename type.
3493 Then we can give better diagnostics if we find a non-type. */
3494 t = lookup_field (context, name, 2, /*want_type=*/true);
3498 if ((!t || TREE_CODE (t) == TREE_LIST) && dependent_type_p (context))
3499 return build_typename_type (context, name, fullname, tag_type);
3501 want_template = TREE_CODE (fullname) == TEMPLATE_ID_EXPR;
3505 if (complain & tf_error)
3506 error (want_template ? G_("no class template named %q#T in %q#T")
3507 : G_("no type named %q#T in %q#T"), name, context);
3508 return error_mark_node;
3511 /* Pull out the template from an injected-class-name (or multiple). */
3513 t = maybe_get_template_decl_from_type_decl (t);
3515 if (TREE_CODE (t) == TREE_LIST)
3517 if (complain & tf_error)
3519 error ("lookup of %qT in %qT is ambiguous", name, context);
3520 print_candidates (t);
3522 return error_mark_node;
3525 if (want_template && !DECL_TYPE_TEMPLATE_P (t))
3527 if (complain & tf_error)
3528 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3530 return error_mark_node;
3532 if (!want_template && TREE_CODE (t) != TYPE_DECL)
3534 if (complain & tf_error)
3535 error ("%<typename %T::%D%> names %q#T, which is not a type",
3537 return error_mark_node;
3540 if (!perform_or_defer_access_check (TYPE_BINFO (context), t, t, complain))
3541 return error_mark_node;
3543 /* If we are currently parsing a template and if T is a typedef accessed
3544 through CONTEXT then we need to remember and check access of T at
3545 template instantiation time. */
3546 add_typedef_to_current_template_for_access_check (t, context, input_location);
3549 return lookup_template_class (t, TREE_OPERAND (fullname, 1),
3551 /*entering_scope=*/0,
3552 tf_warning_or_error | tf_user);
3554 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
3557 maybe_record_typedef_use (t);
3562 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3563 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3564 in which case error_mark_node is returned.
3566 If PARM_LIST is non-NULL, also make sure that the template parameter
3567 list of TEMPLATE_DECL matches.
3569 If COMPLAIN zero, don't complain about any errors that occur. */
3572 make_unbound_class_template (tree context, tree name, tree parm_list,
3573 tsubst_flags_t complain)
3579 name = TYPE_IDENTIFIER (name);
3580 else if (DECL_P (name))
3581 name = DECL_NAME (name);
3582 gcc_assert (identifier_p (name));
3584 if (!dependent_type_p (context)
3585 || currently_open_class (context))
3587 tree tmpl = NULL_TREE;
3589 if (MAYBE_CLASS_TYPE_P (context))
3590 tmpl = lookup_field (context, name, 0, false);
3592 if (tmpl && TREE_CODE (tmpl) == TYPE_DECL)
3593 tmpl = maybe_get_template_decl_from_type_decl (tmpl);
3595 if (!tmpl || !DECL_TYPE_TEMPLATE_P (tmpl))
3597 if (complain & tf_error)
3598 error ("no class template named %q#T in %q#T", name, context);
3599 return error_mark_node;
3603 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
3605 if (complain & tf_error)
3607 error ("template parameters do not match template %qD", tmpl);
3608 inform (DECL_SOURCE_LOCATION (tmpl),
3609 "%qD declared here", tmpl);
3611 return error_mark_node;
3614 if (!perform_or_defer_access_check (TYPE_BINFO (context), tmpl, tmpl,
3616 return error_mark_node;
3621 /* Build the UNBOUND_CLASS_TEMPLATE. */
3622 t = cxx_make_type (UNBOUND_CLASS_TEMPLATE);
3623 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
3624 TREE_TYPE (t) = NULL_TREE;
3625 SET_TYPE_STRUCTURAL_EQUALITY (t);
3627 /* Build the corresponding TEMPLATE_DECL. */
3628 d = build_decl (input_location, TEMPLATE_DECL, name, t);
3629 TYPE_NAME (TREE_TYPE (d)) = d;
3630 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3631 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3632 DECL_ARTIFICIAL (d) = 1;
3633 DECL_TEMPLATE_PARMS (d) = parm_list;
3640 /* Push the declarations of builtin types into the namespace.
3641 RID_INDEX is the index of the builtin type in the array
3642 RID_POINTERS. NAME is the name used when looking up the builtin
3643 type. TYPE is the _TYPE node for the builtin type. */
3646 record_builtin_type (enum rid rid_index,
3650 tree rname = NULL_TREE, tname = NULL_TREE;
3651 tree tdecl = NULL_TREE;
3653 if ((int) rid_index < (int) RID_MAX)
3654 rname = ridpointers[(int) rid_index];
3656 tname = get_identifier (name);
3658 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
3659 eliminated. Built-in types should not be looked up name; their
3660 names are keywords that the parser can recognize. However, there
3661 is code in c-common.c that uses identifier_global_value to look
3662 up built-in types by name. */
3665 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, tname, type);
3666 DECL_ARTIFICIAL (tdecl) = 1;
3667 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
3673 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, rname, type);
3674 DECL_ARTIFICIAL (tdecl) = 1;
3676 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
3679 if (!TYPE_NAME (type))
3680 TYPE_NAME (type) = tdecl;
3683 debug_hooks->type_decl (tdecl, 0);
3686 /* Record one of the standard Java types.
3687 * Declare it as having the given NAME.
3688 * If SIZE > 0, it is the size of one of the integral types;
3689 * otherwise it is the negative of the size of one of the other types. */
3692 record_builtin_java_type (const char* name, int size)
3697 type = build_nonstandard_integer_type (size, 0);
3698 type = build_distinct_type_copy (type);
3700 else if (size > -32)
3703 /* "__java_char" or ""__java_boolean". */
3704 type = build_nonstandard_integer_type (-size, 1);
3705 type = build_distinct_type_copy (type);
3706 /* Get the signed type cached and attached to the unsigned type,
3707 so it doesn't get garbage-collected at "random" times,
3708 causing potential codegen differences out of different UIDs
3709 and different alias set numbers. */
3710 stype = build_nonstandard_integer_type (-size, 0);
3711 stype = build_distinct_type_copy (stype);
3712 TREE_CHAIN (type) = stype;
3713 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
3716 { /* "__java_float" or ""__java_double". */
3717 type = make_node (REAL_TYPE);
3718 TYPE_PRECISION (type) = - size;
3721 record_builtin_type (RID_MAX, name, type);
3722 decl = TYPE_NAME (type);
3724 /* Suppress generate debug symbol entries for these types,
3725 since for normal C++ they are just clutter.
3726 However, push_lang_context undoes this if extern "Java" is seen. */
3727 DECL_IGNORED_P (decl) = 1;
3729 TYPE_FOR_JAVA (type) = 1;
3733 /* Push a type into the namespace so that the back ends ignore it. */
3736 record_unknown_type (tree type, const char* name)
3738 tree decl = pushdecl (build_decl (UNKNOWN_LOCATION,
3739 TYPE_DECL, get_identifier (name), type));
3740 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3741 DECL_IGNORED_P (decl) = 1;
3742 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
3743 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
3744 TYPE_ALIGN (type) = 1;
3745 TYPE_USER_ALIGN (type) = 0;
3746 SET_TYPE_MODE (type, TYPE_MODE (void_type_node));
3749 /* A string for which we should create an IDENTIFIER_NODE at
3752 typedef struct predefined_identifier
3754 /* The name of the identifier. */
3755 const char *const name;
3756 /* The place where the IDENTIFIER_NODE should be stored. */
3758 /* Nonzero if this is the name of a constructor or destructor. */
3759 const int ctor_or_dtor_p;
3760 } predefined_identifier;
3762 /* Create all the predefined identifiers. */
3765 initialize_predefined_identifiers (void)
3767 const predefined_identifier *pid;
3769 /* A table of identifiers to create at startup. */
3770 static const predefined_identifier predefined_identifiers[] = {
3771 { "C++", &lang_name_cplusplus, 0 },
3772 { "C", &lang_name_c, 0 },
3773 { "Java", &lang_name_java, 0 },
3774 /* Some of these names have a trailing space so that it is
3775 impossible for them to conflict with names written by users. */
3776 { "__ct ", &ctor_identifier, 1 },
3777 { "__base_ctor ", &base_ctor_identifier, 1 },
3778 { "__comp_ctor ", &complete_ctor_identifier, 1 },
3779 { "__dt ", &dtor_identifier, 1 },
3780 { "__comp_dtor ", &complete_dtor_identifier, 1 },
3781 { "__base_dtor ", &base_dtor_identifier, 1 },
3782 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
3783 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
3784 { "nelts", &nelts_identifier, 0 },
3785 { THIS_NAME, &this_identifier, 0 },
3786 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
3787 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
3788 { "_vptr", &vptr_identifier, 0 },
3789 { "__vtt_parm", &vtt_parm_identifier, 0 },
3790 { "::", &global_scope_name, 0 },
3791 { "std", &std_identifier, 0 },
3795 for (pid = predefined_identifiers; pid->name; ++pid)
3797 *pid->node = get_identifier (pid->name);
3798 if (pid->ctor_or_dtor_p)
3799 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
3803 /* Create the predefined scalar types of C,
3804 and some nodes representing standard constants (0, 1, (void *)0).
3805 Initialize the global binding level.
3806 Make definitions for built-in primitive functions. */
3809 cxx_init_decl_processing (void)
3812 tree void_ftype_ptr;
3814 /* Create all the identifiers we need. */
3815 initialize_predefined_identifiers ();
3817 /* Create the global variables. */
3818 push_to_top_level ();
3820 current_function_decl = NULL_TREE;
3821 current_binding_level = NULL;
3822 /* Enter the global namespace. */
3823 gcc_assert (global_namespace == NULL_TREE);
3824 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
3826 DECL_CONTEXT (global_namespace) = build_translation_unit_decl (NULL_TREE);
3827 TREE_PUBLIC (global_namespace) = 1;
3828 begin_scope (sk_namespace, global_namespace);
3830 if (flag_visibility_ms_compat)
3831 default_visibility = VISIBILITY_HIDDEN;
3834 current_lang_name = lang_name_c;
3836 /* Create the `std' namespace. */
3837 push_namespace (std_identifier);
3838 std_node = current_namespace;
3841 c_common_nodes_and_builtins ();
3843 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
3844 java_short_type_node = record_builtin_java_type ("__java_short", 16);
3845 java_int_type_node = record_builtin_java_type ("__java_int", 32);
3846 java_long_type_node = record_builtin_java_type ("__java_long", 64);
3847 java_float_type_node = record_builtin_java_type ("__java_float", -32);
3848 java_double_type_node = record_builtin_java_type ("__java_double", -64);
3849 java_char_type_node = record_builtin_java_type ("__java_char", -16);
3850 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
3852 integer_two_node = build_int_cst (NULL_TREE, 2);
3854 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
3855 truthvalue_type_node = boolean_type_node;
3856 truthvalue_false_node = boolean_false_node;
3857 truthvalue_true_node = boolean_true_node;
3859 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
3860 noexcept_true_spec = build_tree_list (boolean_true_node, NULL_TREE);
3861 noexcept_false_spec = build_tree_list (boolean_false_node, NULL_TREE);
3864 record_builtin_type (RID_MAX, NULL, string_type_node);
3867 delta_type_node = ptrdiff_type_node;
3868 vtable_index_type = ptrdiff_type_node;
3870 vtt_parm_type = build_pointer_type (const_ptr_type_node);
3871 void_ftype = build_function_type_list (void_type_node, NULL_TREE);
3872 void_ftype_ptr = build_function_type_list (void_type_node,
3873 ptr_type_node, NULL_TREE);
3875 = build_exception_variant (void_ftype_ptr, empty_except_spec);
3877 /* C++ extensions */
3879 unknown_type_node = make_node (LANG_TYPE);
3880 record_unknown_type (unknown_type_node, "unknown type");
3882 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3883 TREE_TYPE (unknown_type_node) = unknown_type_node;
3885 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3887 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
3888 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
3890 init_list_type_node = make_node (LANG_TYPE);
3891 record_unknown_type (init_list_type_node, "init list");
3894 /* Make sure we get a unique function type, so we can give
3895 its pointer type a name. (This wins for gdb.) */
3896 tree vfunc_type = make_node (FUNCTION_TYPE);
3897 TREE_TYPE (vfunc_type) = integer_type_node;
3898 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
3899 layout_type (vfunc_type);
3901 vtable_entry_type = build_pointer_type (vfunc_type);
3903 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
3906 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
3907 layout_type (vtbl_type_node);
3908 vtbl_type_node = cp_build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
3909 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
3910 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
3911 layout_type (vtbl_ptr_type_node);
3912 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
3914 push_namespace (get_identifier ("__cxxabiv1"));
3915 abi_node = current_namespace;
3918 global_type_node = make_node (LANG_TYPE);
3919 record_unknown_type (global_type_node, "global type");
3922 current_lang_name = lang_name_cplusplus;
3925 tree newattrs, extvisattr;
3926 tree newtype, deltype;
3927 tree ptr_ftype_sizetype;
3931 = build_function_type_list (ptr_type_node, size_type_node, NULL_TREE);
3932 if (cxx_dialect == cxx98)
3935 tree bad_alloc_type_node;
3936 tree bad_alloc_decl;
3938 push_namespace (std_identifier);
3939 bad_alloc_id = get_identifier ("bad_alloc");
3940 bad_alloc_type_node = make_class_type (RECORD_TYPE);
3941 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3943 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3944 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3948 = add_exception_specifier (NULL_TREE, bad_alloc_type_node, -1);
3951 new_eh_spec = noexcept_false_spec;
3953 /* Ensure attribs.c is initialized. */
3955 extvisattr = build_tree_list (get_identifier ("externally_visible"),
3957 newattrs = tree_cons (get_identifier ("alloc_size"),
3958 build_tree_list (NULL_TREE, integer_one_node),
3960 newtype = cp_build_type_attribute_variant (ptr_ftype_sizetype, newattrs);
3961 newtype = build_exception_variant (newtype, new_eh_spec);
3962 deltype = cp_build_type_attribute_variant (void_ftype_ptr, extvisattr);
3963 deltype = build_exception_variant (deltype, empty_except_spec);
3964 tree opnew = push_cp_library_fn (NEW_EXPR, newtype, 0);
3965 DECL_IS_MALLOC (opnew) = 1;
3966 DECL_IS_OPERATOR_NEW (opnew) = 1;
3967 opnew = push_cp_library_fn (VEC_NEW_EXPR, newtype, 0);
3968 DECL_IS_MALLOC (opnew) = 1;
3969 DECL_IS_OPERATOR_NEW (opnew) = 1;
3970 push_cp_library_fn (DELETE_EXPR, deltype, ECF_NOTHROW);
3971 push_cp_library_fn (VEC_DELETE_EXPR, deltype, ECF_NOTHROW);
3972 if (flag_sized_deallocation)
3974 /* Also push the sized deallocation variants:
3975 void operator delete(void*, std::size_t) throw();
3976 void operator delete[](void*, std::size_t) throw(); */
3977 tree void_ftype_ptr_size
3978 = build_function_type_list (void_type_node, ptr_type_node,
3979 size_type_node, NULL_TREE);
3980 deltype = cp_build_type_attribute_variant (void_ftype_ptr_size,
3982 deltype = build_exception_variant (deltype, empty_except_spec);
3983 push_cp_library_fn (DELETE_EXPR, deltype, ECF_NOTHROW);
3984 push_cp_library_fn (VEC_DELETE_EXPR, deltype, ECF_NOTHROW);
3987 nullptr_type_node = make_node (NULLPTR_TYPE);
3988 TYPE_SIZE (nullptr_type_node) = bitsize_int (GET_MODE_BITSIZE (ptr_mode));
3989 TYPE_SIZE_UNIT (nullptr_type_node) = size_int (GET_MODE_SIZE (ptr_mode));
3990 TYPE_UNSIGNED (nullptr_type_node) = 1;
3991 TYPE_PRECISION (nullptr_type_node) = GET_MODE_BITSIZE (ptr_mode);
3992 SET_TYPE_MODE (nullptr_type_node, ptr_mode);
3993 record_builtin_type (RID_MAX, "decltype(nullptr)", nullptr_type_node);
3994 nullptr_node = build_int_cst (nullptr_type_node, 0);
3998 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype,
3999 ECF_NORETURN | ECF_NOTHROW);
4001 /* Perform other language dependent initializations. */
4002 init_class_processing ();
4003 init_rtti_processing ();
4004 init_template_processing ();
4006 if (flag_exceptions)
4007 init_exception_processing ();
4009 if (! supports_one_only ())
4012 make_fname_decl = cp_make_fname_decl;
4013 start_fname_decls ();
4015 /* Show we use EH for cleanups. */
4016 if (flag_exceptions)
4017 using_eh_for_cleanups ();
4020 /* Generate an initializer for a function naming variable from
4021 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
4022 filled in with the type of the init. */
4025 cp_fname_init (const char* name, tree *type_p)
4027 tree domain = NULL_TREE;
4029 tree init = NULL_TREE;
4034 length = strlen (name);
4035 domain = build_index_type (size_int (length));
4036 init = build_string (length + 1, name);
4039 type = cp_build_qualified_type (char_type_node, TYPE_QUAL_CONST);
4040 type = build_cplus_array_type (type, domain);
4045 TREE_TYPE (init) = type;
4047 init = error_mark_node;
4052 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
4053 the decl, LOC is the location to give the decl, NAME is the
4054 initialization string and TYPE_DEP indicates whether NAME depended
4055 on the type of the function. We make use of that to detect
4056 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
4057 at the point of first use, so we mustn't push the decl now. */
4060 cp_make_fname_decl (location_t loc, tree id, int type_dep)
4062 const char *const name = (type_dep && processing_template_decl
4063 ? NULL : fname_as_string (type_dep));
4065 tree init = cp_fname_init (name, &type);
4066 tree decl = build_decl (loc, VAR_DECL, id, type);
4069 free (CONST_CAST (char *, name));
4071 /* As we're using pushdecl_with_scope, we must set the context. */
4072 DECL_CONTEXT (decl) = current_function_decl;
4074 TREE_STATIC (decl) = 1;
4075 TREE_READONLY (decl) = 1;
4076 DECL_ARTIFICIAL (decl) = 1;
4078 TREE_USED (decl) = 1;
4080 if (current_function_decl)
4082 cp_binding_level *b = current_binding_level;
4083 if (b->kind == sk_function_parms)
4084 return error_mark_node;
4085 while (b->level_chain->kind != sk_function_parms)
4087 pushdecl_with_scope (decl, b, /*is_friend=*/false);
4088 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, NULL_TREE,
4089 LOOKUP_ONLYCONVERTING);
4093 DECL_THIS_STATIC (decl) = true;
4094 pushdecl_top_level_and_finish (decl, init);
4101 builtin_function_1 (tree decl, tree context, bool is_global)
4103 tree id = DECL_NAME (decl);
4104 const char *name = IDENTIFIER_POINTER (id);
4106 retrofit_lang_decl (decl);
4108 DECL_ARTIFICIAL (decl) = 1;
4109 SET_OVERLOADED_OPERATOR_CODE (decl, ERROR_MARK);
4110 SET_DECL_LANGUAGE (decl, lang_c);
4111 /* Runtime library routines are, by definition, available in an
4112 external shared object. */
4113 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
4114 DECL_VISIBILITY_SPECIFIED (decl) = 1;
4116 DECL_CONTEXT (decl) = context;
4119 pushdecl_top_level (decl);
4123 /* A function in the user's namespace should have an explicit
4124 declaration before it is used. Mark the built-in function as
4125 anticipated but not actually declared. */
4126 if (name[0] != '_' || name[1] != '_')
4127 DECL_ANTICIPATED (decl) = 1;
4128 else if (strncmp (name + 2, "builtin_", strlen ("builtin_")) != 0)
4130 size_t len = strlen (name);
4132 /* Treat __*_chk fortification functions as anticipated as well,
4133 unless they are __builtin_*. */
4134 if (len > strlen ("___chk")
4135 && memcmp (name + len - strlen ("_chk"),
4136 "_chk", strlen ("_chk") + 1) == 0)
4137 DECL_ANTICIPATED (decl) = 1;
4144 cxx_builtin_function (tree decl)
4146 tree id = DECL_NAME (decl);
4147 const char *name = IDENTIFIER_POINTER (id);
4148 /* All builtins that don't begin with an '_' should additionally
4149 go in the 'std' namespace. */
4152 tree decl2 = copy_node(decl);
4153 push_namespace (std_identifier);
4154 builtin_function_1 (decl2, std_node, false);
4158 return builtin_function_1 (decl, NULL_TREE, false);
4161 /* Like cxx_builtin_function, but guarantee the function is added to the global
4162 scope. This is to allow function specific options to add new machine
4163 dependent builtins when the target ISA changes via attribute((target(...)))
4164 which saves space on program startup if the program does not use non-generic
4168 cxx_builtin_function_ext_scope (tree decl)
4171 tree id = DECL_NAME (decl);
4172 const char *name = IDENTIFIER_POINTER (id);
4173 /* All builtins that don't begin with an '_' should additionally
4174 go in the 'std' namespace. */
4177 tree decl2 = copy_node(decl);
4178 push_namespace (std_identifier);
4179 builtin_function_1 (decl2, std_node, true);
4183 return builtin_function_1 (decl, NULL_TREE, true);
4186 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
4187 function. Not called directly. */
4190 build_library_fn (tree name, enum tree_code operator_code, tree type,
4193 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
4194 DECL_EXTERNAL (fn) = 1;
4195 TREE_PUBLIC (fn) = 1;
4196 DECL_ARTIFICIAL (fn) = 1;
4197 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
4198 SET_DECL_LANGUAGE (fn, lang_c);
4199 /* Runtime library routines are, by definition, available in an
4200 external shared object. */
4201 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
4202 DECL_VISIBILITY_SPECIFIED (fn) = 1;
4203 set_call_expr_flags (fn, ecf_flags);
4207 /* Returns the _DECL for a library function with C++ linkage. */
4210 build_cp_library_fn (tree name, enum tree_code operator_code, tree type,
4213 tree fn = build_library_fn (name, operator_code, type, ecf_flags);
4214 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
4215 SET_DECL_LANGUAGE (fn, lang_cplusplus);
4219 /* Like build_library_fn, but takes a C string instead of an
4223 build_library_fn_ptr (const char* name, tree type, int ecf_flags)
4225 return build_library_fn (get_identifier (name), ERROR_MARK, type, ecf_flags);
4228 /* Like build_cp_library_fn, but takes a C string instead of an
4232 build_cp_library_fn_ptr (const char* name, tree type, int ecf_flags)
4234 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type,
4238 /* Like build_library_fn, but also pushes the function so that we will
4239 be able to find it via IDENTIFIER_GLOBAL_VALUE. Also, the function
4240 may throw exceptions listed in RAISES. */
4243 push_library_fn (tree name, tree type, tree raises, int ecf_flags)
4248 type = build_exception_variant (type, raises);
4250 fn = build_library_fn (name, ERROR_MARK, type, ecf_flags);
4251 pushdecl_top_level (fn);
4255 /* Like build_cp_library_fn, but also pushes the function so that it
4256 will be found by normal lookup. */
4259 push_cp_library_fn (enum tree_code operator_code, tree type,
4262 tree fn = build_cp_library_fn (ansi_opname (operator_code),
4267 apply_tm_attr (fn, get_identifier ("transaction_safe"));
4271 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
4275 push_void_library_fn (tree name, tree parmtypes, int ecf_flags)
4277 tree type = build_function_type (void_type_node, parmtypes);
4278 return push_library_fn (name, type, NULL_TREE, ecf_flags);
4281 /* Like push_library_fn, but also note that this function throws
4282 and does not return. Used for __throw_foo and the like. */
4285 push_throw_library_fn (tree name, tree type)
4287 tree fn = push_library_fn (name, type, NULL_TREE, ECF_NORETURN);
4291 /* When we call finish_struct for an anonymous union, we create
4292 default copy constructors and such. But, an anonymous union
4293 shouldn't have such things; this function undoes the damage to the
4294 anonymous union type T.
4296 (The reason that we create the synthesized methods is that we don't
4297 distinguish `union { int i; }' from `typedef union { int i; } U'.
4298 The first is an anonymous union; the second is just an ordinary
4302 fixup_anonymous_aggr (tree t)
4306 /* Wipe out memory of synthesized methods. */
4307 TYPE_HAS_USER_CONSTRUCTOR (t) = 0;
4308 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
4309 TYPE_HAS_COPY_CTOR (t) = 0;
4310 TYPE_HAS_CONST_COPY_CTOR (t) = 0;
4311 TYPE_HAS_COPY_ASSIGN (t) = 0;
4312 TYPE_HAS_CONST_COPY_ASSIGN (t) = 0;
4314 /* Splice the implicitly generated functions out of the TYPE_METHODS
4316 q = &TYPE_METHODS (t);
4319 if (DECL_ARTIFICIAL (*q))
4320 *q = TREE_CHAIN (*q);
4322 q = &DECL_CHAIN (*q);
4325 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
4326 if (TYPE_METHODS (t))
4328 tree decl = TYPE_MAIN_DECL (t);
4330 if (TREE_CODE (t) != UNION_TYPE)
4331 error_at (DECL_SOURCE_LOCATION (decl),
4332 "an anonymous struct cannot have function members");
4334 error_at (DECL_SOURCE_LOCATION (decl),
4335 "an anonymous union cannot have function members");
4338 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
4339 assignment operators (because they cannot have these methods themselves).
4340 For anonymous unions this is already checked because they are not allowed
4341 in any union, otherwise we have to check it. */
4342 if (TREE_CODE (t) != UNION_TYPE)
4346 for (field = TYPE_FIELDS (t); field; field = DECL_CHAIN (field))
4347 if (TREE_CODE (field) == FIELD_DECL)
4349 type = TREE_TYPE (field);
4350 if (CLASS_TYPE_P (type))
4352 if (TYPE_NEEDS_CONSTRUCTING (type))
4353 error ("member %q+#D with constructor not allowed "
4354 "in anonymous aggregate", field);
4355 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
4356 error ("member %q+#D with destructor not allowed "
4357 "in anonymous aggregate", field);
4358 if (TYPE_HAS_COMPLEX_COPY_ASSIGN (type))
4359 error ("member %q+#D with copy assignment operator "
4360 "not allowed in anonymous aggregate", field);
4366 /* Warn for an attribute located at LOCATION that appertains to the
4367 class type CLASS_TYPE that has not been properly placed after its
4368 class-key, in it class-specifier. */
4371 warn_misplaced_attr_for_class_type (source_location location,
4374 gcc_assert (OVERLOAD_TYPE_P (class_type));
4376 if (warning_at (location, OPT_Wattributes,
4377 "attribute ignored in declaration "
4378 "of %q#T", class_type))
4380 "attribute for %q#T must follow the %qs keyword",
4381 class_type, class_key_or_enum_as_string (class_type));
4384 /* Make sure that a declaration with no declarator is well-formed, i.e.
4385 just declares a tagged type or anonymous union.
4387 Returns the type declared; or NULL_TREE if none. */
4390 check_tag_decl (cp_decl_specifier_seq *declspecs,
4391 bool explicit_type_instantiation_p)
4393 int saw_friend = decl_spec_seq_has_spec_p (declspecs, ds_friend);
4394 int saw_typedef = decl_spec_seq_has_spec_p (declspecs, ds_typedef);
4395 /* If a class, struct, or enum type is declared by the DECLSPECS
4396 (i.e, if a class-specifier, enum-specifier, or non-typename
4397 elaborated-type-specifier appears in the DECLSPECS),
4398 DECLARED_TYPE is set to the corresponding type. */
4399 tree declared_type = NULL_TREE;
4400 bool error_p = false;
4402 if (declspecs->multiple_types_p)
4403 error ("multiple types in one declaration");
4404 else if (declspecs->redefined_builtin_type)
4406 if (!in_system_header_at (input_location))
4407 permerror (declspecs->locations[ds_redefined_builtin_type_spec],
4408 "redeclaration of C++ built-in type %qT",
4409 declspecs->redefined_builtin_type);
4414 && TYPE_P (declspecs->type)
4415 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
4416 && MAYBE_CLASS_TYPE_P (declspecs->type))
4417 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
4418 declared_type = declspecs->type;
4419 else if (declspecs->type == error_mark_node)
4421 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
4422 permerror (input_location, "declaration does not declare anything");
4423 else if (declared_type != NULL_TREE && type_uses_auto (declared_type))
4425 error ("%<auto%> can only be specified for variables "
4426 "or function declarations");
4427 return error_mark_node;
4429 /* Check for an anonymous union. */
4430 else if (declared_type && RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type))
4431 && TYPE_ANONYMOUS_P (declared_type))
4433 /* 7/3 In a simple-declaration, the optional init-declarator-list
4434 can be omitted only when declaring a class (clause 9) or
4435 enumeration (7.2), that is, when the decl-specifier-seq contains
4436 either a class-specifier, an elaborated-type-specifier with
4437 a class-key (9.1), or an enum-specifier. In these cases and
4438 whenever a class-specifier or enum-specifier is present in the
4439 decl-specifier-seq, the identifiers in these specifiers are among
4440 the names being declared by the declaration (as class-name,
4441 enum-names, or enumerators, depending on the syntax). In such
4442 cases, and except for the declaration of an unnamed bit-field (9.6),
4443 the decl-specifier-seq shall introduce one or more names into the
4444 program, or shall redeclare a name introduced by a previous
4445 declaration. [Example:
4446 enum { }; // ill-formed
4447 typedef class { }; // ill-formed
4451 error ("missing type-name in typedef-declaration");
4454 /* Anonymous unions are objects, so they can have specifiers. */;
4455 SET_ANON_AGGR_TYPE_P (declared_type);
4457 if (TREE_CODE (declared_type) != UNION_TYPE
4458 && !in_system_header_at (input_location))
4459 pedwarn (input_location, OPT_Wpedantic, "ISO C++ prohibits anonymous structs");
4464 if (decl_spec_seq_has_spec_p (declspecs, ds_inline)
4465 || decl_spec_seq_has_spec_p (declspecs, ds_virtual))
4466 error ("%qs can only be specified for functions",
4467 decl_spec_seq_has_spec_p (declspecs, ds_inline)
4468 ? "inline" : "virtual");
4470 && (!current_class_type
4471 || current_scope () != current_class_type))
4472 error ("%<friend%> can only be specified inside a class");
4473 else if (decl_spec_seq_has_spec_p (declspecs, ds_explicit))
4474 error ("%<explicit%> can only be specified for constructors");
4475 else if (declspecs->storage_class)
4476 error ("a storage class can only be specified for objects "
4478 else if (decl_spec_seq_has_spec_p (declspecs, ds_const)
4479 || decl_spec_seq_has_spec_p (declspecs, ds_volatile)
4480 || decl_spec_seq_has_spec_p (declspecs, ds_restrict)
4481 || decl_spec_seq_has_spec_p (declspecs, ds_thread))
4482 error ("qualifiers can only be specified for objects "
4484 else if (saw_typedef)
4485 warning (0, "%<typedef%> was ignored in this declaration");
4486 else if (decl_spec_seq_has_spec_p (declspecs, ds_constexpr))
4487 error ("%<constexpr%> cannot be used for type declarations");
4490 if (declspecs->attributes && warn_attributes && declared_type)
4493 if (!CLASS_TYPE_P (declared_type)
4494 || !CLASSTYPE_TEMPLATE_INSTANTIATION (declared_type))
4495 /* For a non-template class, use the name location. */
4496 loc = location_of (declared_type);
4498 /* For a template class (an explicit instantiation), use the
4499 current location. */
4500 loc = input_location;
4502 if (explicit_type_instantiation_p)
4503 /* [dcl.attr.grammar]/4:
4505 No attribute-specifier-seq shall appertain to an explicit
4508 if (warning_at (loc, OPT_Wattributes,
4509 "attribute ignored in explicit instantiation %q#T",
4512 "no attribute can be applied to "
4513 "an explicit instantiation");
4516 warn_misplaced_attr_for_class_type (loc, declared_type);
4519 return declared_type;
4522 /* Called when a declaration is seen that contains no names to declare.
4523 If its type is a reference to a structure, union or enum inherited
4524 from a containing scope, shadow that tag name for the current scope
4525 with a forward reference.
4526 If its type defines a new named structure or union
4527 or defines an enum, it is valid but we need not do anything here.
4528 Otherwise, it is an error.
4530 C++: may have to grok the declspecs to learn about static,
4531 complain for anonymous unions.
4533 Returns the TYPE declared -- or NULL_TREE if none. */
4536 shadow_tag (cp_decl_specifier_seq *declspecs)
4538 tree t = check_tag_decl (declspecs,
4539 /*explicit_type_instantiation_p=*/false);
4544 if (maybe_process_partial_specialization (t) == error_mark_node)
4547 /* This is where the variables in an anonymous union are
4548 declared. An anonymous union declaration looks like:
4550 because there is no declarator after the union, the parser
4551 sends that declaration here. */
4552 if (ANON_AGGR_TYPE_P (t))
4554 fixup_anonymous_aggr (t);
4556 if (TYPE_FIELDS (t))
4558 tree decl = grokdeclarator (/*declarator=*/NULL,
4559 declspecs, NORMAL, 0, NULL);
4560 finish_anon_union (decl);
4567 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4570 groktypename (cp_decl_specifier_seq *type_specifiers,
4571 const cp_declarator *declarator,
4572 bool is_template_arg)
4576 enum decl_context context
4577 = is_template_arg ? TEMPLATE_TYPE_ARG : TYPENAME;
4578 attrs = type_specifiers->attributes;
4579 type_specifiers->attributes = NULL_TREE;
4580 type = grokdeclarator (declarator, type_specifiers, context, 0, &attrs);
4581 if (attrs && type != error_mark_node)
4583 if (CLASS_TYPE_P (type))
4584 warning (OPT_Wattributes, "ignoring attributes applied to class type %qT "
4585 "outside of definition", type);
4586 else if (MAYBE_CLASS_TYPE_P (type))
4587 /* A template type parameter or other dependent type. */
4588 warning (OPT_Wattributes, "ignoring attributes applied to dependent "
4589 "type %qT without an associated declaration", type);
4591 cplus_decl_attributes (&type, attrs, 0);
4596 /* Process a DECLARATOR for a function-scope variable declaration,
4597 namespace-scope variable declaration, or function declaration.
4598 (Function definitions go through start_function; class member
4599 declarations appearing in the body of the class go through
4600 grokfield.) The DECL corresponding to the DECLARATOR is returned.
4601 If an error occurs, the error_mark_node is returned instead.
4603 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
4604 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
4605 for an explicitly defaulted function, or SD_DELETED for an explicitly
4606 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
4607 implicitly initialized via a default constructor. ATTRIBUTES and
4608 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
4610 The scope represented by the context of the returned DECL is pushed
4611 (if it is not the global namespace) and is assigned to
4612 *PUSHED_SCOPE_P. The caller is then responsible for calling
4613 pop_scope on *PUSHED_SCOPE_P if it is set. */
4616 start_decl (const cp_declarator *declarator,
4617 cp_decl_specifier_seq *declspecs,
4620 tree prefix_attributes,
4621 tree *pushed_scope_p)
4629 *pushed_scope_p = NULL_TREE;
4631 /* An object declared as __attribute__((deprecated)) suppresses
4632 warnings of uses of other deprecated items. */
4633 if (lookup_attribute ("deprecated", attributes))
4634 deprecated_state = DEPRECATED_SUPPRESS;
4636 attributes = chainon (attributes, prefix_attributes);
4638 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
4641 deprecated_state = DEPRECATED_NORMAL;
4643 if (decl == NULL_TREE || VOID_TYPE_P (decl)
4644 || decl == error_mark_node)
4645 return error_mark_node;
4647 context = CP_DECL_CONTEXT (decl);
4648 if (context != global_namespace)
4649 *pushed_scope_p = push_scope (context);
4651 /* Is it valid for this decl to have an initializer at all?
4652 If not, set INITIALIZED to zero, which will indirectly
4653 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4655 && TREE_CODE (decl) == TYPE_DECL)
4657 error ("typedef %qD is initialized (use decltype instead)", decl);
4658 return error_mark_node;
4663 if (! toplevel_bindings_p ()
4664 && DECL_EXTERNAL (decl))
4665 warning (0, "declaration of %q#D has %<extern%> and is initialized",
4667 DECL_EXTERNAL (decl) = 0;
4668 if (toplevel_bindings_p ())
4669 TREE_STATIC (decl) = 1;
4671 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl)) != 0;
4673 if (alias && TREE_CODE (decl) == FUNCTION_DECL)
4674 record_key_method_defined (decl);
4676 /* If this is a typedef that names the class for linkage purposes
4677 (7.1.3p8), apply any attributes directly to the type. */
4678 if (TREE_CODE (decl) == TYPE_DECL
4679 && OVERLOAD_TYPE_P (TREE_TYPE (decl))
4680 && decl == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl))))
4681 flags = ATTR_FLAG_TYPE_IN_PLACE;
4685 /* Set attributes here so if duplicate decl, will have proper attributes. */
4686 cplus_decl_attributes (&decl, attributes, flags);
4688 /* Dllimported symbols cannot be defined. Static data members (which
4689 can be initialized in-class and dllimported) go through grokfield,
4690 not here, so we don't need to exclude those decls when checking for
4692 if (initialized && DECL_DLLIMPORT_P (decl))
4694 error ("definition of %q#D is marked %<dllimport%>", decl);
4695 DECL_DLLIMPORT_P (decl) = 0;
4698 /* If #pragma weak was used, mark the decl weak now. */
4699 if (!processing_template_decl)
4700 maybe_apply_pragma_weak (decl);
4702 if (TREE_CODE (decl) == FUNCTION_DECL
4703 && DECL_DECLARED_INLINE_P (decl)
4704 && DECL_UNINLINABLE (decl)
4705 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4706 warning (0, "inline function %q+D given attribute noinline", decl);
4708 if (TYPE_P (context) && COMPLETE_TYPE_P (complete_type (context)))
4710 bool this_tmpl = (processing_template_decl
4711 > template_class_depth (context));
4714 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
4715 if (field == NULL_TREE
4716 || !(VAR_P (field) || variable_template_p (field)))
4717 error ("%q+#D is not a static data member of %q#T", decl, context);
4718 else if (variable_template_p (field) && !this_tmpl)
4720 if (DECL_LANG_SPECIFIC (decl)
4721 && DECL_TEMPLATE_SPECIALIZATION (decl))
4722 /* OK, specialization was already checked. */;
4725 error_at (DECL_SOURCE_LOCATION (decl),
4726 "non-member-template declaration of %qD", decl);
4727 inform (DECL_SOURCE_LOCATION (field), "does not match "
4728 "member template declaration here");
4729 return error_mark_node;
4734 if (variable_template_p (field))
4735 field = DECL_TEMPLATE_RESULT (field);
4737 if (DECL_CONTEXT (field) != context)
4739 if (!same_type_p (DECL_CONTEXT (field), context))
4740 permerror (input_location, "ISO C++ does not permit %<%T::%D%> "
4741 "to be defined as %<%T::%D%>",
4742 DECL_CONTEXT (field), DECL_NAME (decl),
4743 context, DECL_NAME (decl));
4744 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
4746 /* Static data member are tricky; an in-class initialization
4747 still doesn't provide a definition, so the in-class
4748 declaration will have DECL_EXTERNAL set, but will have an
4749 initialization. Thus, duplicate_decls won't warn
4750 about this situation, and so we check here. */
4751 if (initialized && DECL_INITIALIZED_IN_CLASS_P (field))
4752 error ("duplicate initialization of %qD", decl);
4753 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
4755 if (decl_spec_seq_has_spec_p (declspecs, ds_constexpr)
4756 && !DECL_DECLARED_CONSTEXPR_P (field))
4757 error ("%qD declared %<constexpr%> outside its class", field);
4762 tree field = check_classfn (context, decl,
4764 ? current_template_parms
4766 if (field && field != error_mark_node
4767 && duplicate_decls (decl, field,
4768 /*newdecl_is_friend=*/false))
4772 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
4773 DECL_IN_AGGR_P (decl) = 0;
4774 /* Do not mark DECL as an explicit specialization if it was not
4775 already marked as an instantiation; a declaration should
4776 never be marked as a specialization unless we know what
4777 template is being specialized. */
4778 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
4780 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
4781 if (TREE_CODE (decl) == FUNCTION_DECL)
4782 DECL_COMDAT (decl) = (TREE_PUBLIC (decl)
4783 && DECL_DECLARED_INLINE_P (decl));
4785 DECL_COMDAT (decl) = false;
4787 /* [temp.expl.spec] An explicit specialization of a static data
4788 member of a template is a definition if the declaration
4789 includes an initializer; otherwise, it is a declaration.
4791 We check for processing_specialization so this only applies
4792 to the new specialization syntax. */
4793 if (!initialized && processing_specialization)
4794 DECL_EXTERNAL (decl) = 1;
4797 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl)
4798 /* Aliases are definitions. */
4800 permerror (input_location, "declaration of %q#D outside of class is not definition",
4804 was_public = TREE_PUBLIC (decl);
4806 /* Enter this declaration into the symbol table. */
4807 decl = maybe_push_decl (decl);
4809 if (processing_template_decl)
4810 decl = push_template_decl (decl);
4811 if (decl == error_mark_node)
4812 return error_mark_node;
4815 && DECL_NAMESPACE_SCOPE_P (decl) && !TREE_PUBLIC (decl) && !was_public
4816 && !DECL_THIS_STATIC (decl) && !DECL_ARTIFICIAL (decl))
4818 /* This is a const variable with implicit 'static'. Set
4819 DECL_THIS_STATIC so we can tell it from variables that are
4820 !TREE_PUBLIC because of the anonymous namespace. */
4821 gcc_assert (CP_TYPE_CONST_P (TREE_TYPE (decl)) || errorcount);
4822 DECL_THIS_STATIC (decl) = 1;
4825 if (current_function_decl && VAR_P (decl)
4826 && DECL_DECLARED_CONSTEXPR_P (current_function_decl))
4829 if (DECL_THREAD_LOCAL_P (decl))
4830 error ("%qD declared %<thread_local%> in %<constexpr%> function",
4832 else if (TREE_STATIC (decl))
4833 error ("%qD declared %<static%> in %<constexpr%> function", decl);
4837 cp_function_chain->invalid_constexpr = true;
4840 if (!processing_template_decl && VAR_P (decl))
4841 start_decl_1 (decl, initialized);
4846 /* Process the declaration of a variable DECL. INITIALIZED is true
4847 iff DECL is explicitly initialized. (INITIALIZED is false if the
4848 variable is initialized via an implicitly-called constructor.)
4849 This function must be called for ordinary variables (including, for
4850 example, implicit instantiations of templates), but must not be
4851 called for template declarations. */
4854 start_decl_1 (tree decl, bool initialized)
4858 bool aggregate_definition_p;
4860 gcc_assert (!processing_template_decl);
4862 if (error_operand_p (decl))
4865 gcc_assert (VAR_P (decl));
4867 type = TREE_TYPE (decl);
4868 complete_p = COMPLETE_TYPE_P (type);
4869 aggregate_definition_p = MAYBE_CLASS_TYPE_P (type) && !DECL_EXTERNAL (decl);
4871 /* If an explicit initializer is present, or if this is a definition
4872 of an aggregate, then we need a complete type at this point.
4873 (Scalars are always complete types, so there is nothing to
4874 check.) This code just sets COMPLETE_P; errors (if necessary)
4875 are issued below. */
4876 if ((initialized || aggregate_definition_p)
4878 && COMPLETE_TYPE_P (complete_type (type)))
4881 /* We will not yet have set TREE_READONLY on DECL if the type
4882 was "const", but incomplete, before this point. But, now, we
4883 have a complete type, so we can try again. */
4884 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
4888 /* Is it valid for this decl to have an initializer at all? */
4890 /* Don't allow initializations for incomplete types except for
4891 arrays which might be completed by the initialization. */
4893 ; /* A complete type is ok. */
4894 else if (type_uses_auto (type))
4895 ; /* An auto type is ok. */
4896 else if (TREE_CODE (type) != ARRAY_TYPE)
4898 error ("variable %q#D has initializer but incomplete type", decl);
4899 type = TREE_TYPE (decl) = error_mark_node;
4901 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4903 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
4904 error ("elements of array %q#D have incomplete type", decl);
4905 /* else we already gave an error in start_decl. */
4908 else if (aggregate_definition_p && !complete_p)
4910 if (type_uses_auto (type))
4911 error ("declaration of %q#D has no initializer", decl);
4913 error ("aggregate %q#D has incomplete type and cannot be defined",
4915 /* Change the type so that assemble_variable will give
4916 DECL an rtl we can live with: (mem (const_int 0)). */
4917 type = TREE_TYPE (decl) = error_mark_node;
4920 /* Create a new scope to hold this declaration if necessary.
4921 Whether or not a new scope is necessary cannot be determined
4922 until after the type has been completed; if the type is a
4923 specialization of a class template it is not until after
4924 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
4925 will be set correctly. */
4926 maybe_push_cleanup_level (type);
4929 /* Handle initialization of references. DECL, TYPE, and INIT have the
4930 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
4931 but will be set to a new CLEANUP_STMT if a temporary is created
4932 that must be destroyed subsequently.
4934 Returns an initializer expression to use to initialize DECL, or
4935 NULL if the initialization can be performed statically.
4937 Quotes on semantics can be found in ARM 8.4.3. */
4940 grok_reference_init (tree decl, tree type, tree init, int flags)
4942 if (init == NULL_TREE)
4944 if ((DECL_LANG_SPECIFIC (decl) == 0
4945 || DECL_IN_AGGR_P (decl) == 0)
4946 && ! DECL_THIS_EXTERN (decl))
4947 error ("%qD declared as reference but not initialized", decl);
4951 if (TREE_CODE (init) == TREE_LIST)
4952 init = build_x_compound_expr_from_list (init, ELK_INIT,
4953 tf_warning_or_error);
4955 tree ttype = TREE_TYPE (type);
4956 if (TREE_CODE (ttype) != ARRAY_TYPE
4957 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
4958 /* Note: default conversion is only called in very special cases. */
4959 init = decay_conversion (init, tf_warning_or_error);
4961 /* check_initializer handles this for non-reference variables, but for
4962 references we need to do it here or the initializer will get the
4963 incomplete array type and confuse later calls to
4964 cp_complete_array_type. */
4965 if (TREE_CODE (ttype) == ARRAY_TYPE
4966 && TYPE_DOMAIN (ttype) == NULL_TREE
4967 && (BRACE_ENCLOSED_INITIALIZER_P (init)
4968 || TREE_CODE (init) == STRING_CST))
4970 cp_complete_array_type (&ttype, init, false);
4971 if (ttype != TREE_TYPE (type))
4972 type = cp_build_reference_type (ttype, TYPE_REF_IS_RVALUE (type));
4975 /* Convert INIT to the reference type TYPE. This may involve the
4976 creation of a temporary, whose lifetime must be the same as that
4977 of the reference. If so, a DECL_EXPR for the temporary will be
4978 added just after the DECL_EXPR for DECL. That's why we don't set
4979 DECL_INITIAL for local references (instead assigning to them
4980 explicitly); we need to allow the temporary to be initialized
4982 return initialize_reference (type, init, flags,
4983 tf_warning_or_error);
4986 /* Designated initializers in arrays are not supported in GNU C++.
4987 The parser cannot detect this error since it does not know whether
4988 a given brace-enclosed initializer is for a class type or for an
4989 array. This function checks that CE does not use a designated
4990 initializer. If it does, an error is issued. Returns true if CE
4991 is valid, i.e., does not have a designated initializer. */
4994 check_array_designated_initializer (constructor_elt *ce,
4995 unsigned HOST_WIDE_INT index)
4997 /* Designated initializers for array elements are not supported. */
5000 /* The parser only allows identifiers as designated
5002 if (ce->index == error_mark_node)
5004 error ("name used in a GNU-style designated "
5005 "initializer for an array");
5008 else if (identifier_p (ce->index))
5010 error ("name %qD used in a GNU-style designated "
5011 "initializer for an array", ce->index);
5015 tree ce_index = build_expr_type_conversion (WANT_INT | WANT_ENUM,
5018 && INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (ce_index))
5019 && (TREE_CODE (ce_index = maybe_constant_value (ce_index))
5022 /* A C99 designator is OK if it matches the current index. */
5023 if (wi::eq_p (ce_index, index))
5026 sorry ("non-trivial designated initializers not supported");
5029 error ("C99 designator %qE is not an integral constant-expression",
5038 /* When parsing `int a[] = {1, 2};' we don't know the size of the
5039 array until we finish parsing the initializer. If that's the
5040 situation we're in, update DECL accordingly. */
5043 maybe_deduce_size_from_array_init (tree decl, tree init)
5045 tree type = TREE_TYPE (decl);
5047 if (TREE_CODE (type) == ARRAY_TYPE
5048 && TYPE_DOMAIN (type) == NULL_TREE
5049 && TREE_CODE (decl) != TYPE_DECL)
5051 /* do_default is really a C-ism to deal with tentative definitions.
5052 But let's leave it here to ease the eventual merge. */
5053 int do_default = !DECL_EXTERNAL (decl);
5054 tree initializer = init ? init : DECL_INITIAL (decl);
5057 /* Check that there are no designated initializers in INIT, as
5058 those are not supported in GNU C++, and as the middle-end
5059 will crash if presented with a non-numeric designated
5061 if (initializer && BRACE_ENCLOSED_INITIALIZER_P (initializer))
5063 vec<constructor_elt, va_gc> *v = CONSTRUCTOR_ELTS (initializer);
5064 constructor_elt *ce;
5066 FOR_EACH_VEC_SAFE_ELT (v, i, ce)
5067 if (!check_array_designated_initializer (ce, i))
5073 failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
5077 error ("initializer fails to determine size of %qD", decl);
5079 else if (failure == 2)
5083 error ("array size missing in %qD", decl);
5085 /* If a `static' var's size isn't known, make it extern as
5086 well as static, so it does not get allocated. If it's not
5087 `static', then don't mark it extern; finish_incomplete_decl
5088 will give it a default size and it will get allocated. */
5089 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
5090 DECL_EXTERNAL (decl) = 1;
5092 else if (failure == 3)
5094 error ("zero-size array %qD", decl);
5098 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
5100 relayout_decl (decl);
5104 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
5105 any appropriate error messages regarding the layout. */
5108 layout_var_decl (tree decl)
5112 type = TREE_TYPE (decl);
5113 if (type == error_mark_node)
5116 /* If we haven't already laid out this declaration, do so now.
5117 Note that we must not call complete type for an external object
5118 because it's type might involve templates that we are not
5119 supposed to instantiate yet. (And it's perfectly valid to say
5120 `extern X x' for some incomplete type `X'.) */
5121 if (!DECL_EXTERNAL (decl))
5122 complete_type (type);
5123 if (!DECL_SIZE (decl)
5124 && TREE_TYPE (decl) != error_mark_node
5125 && (COMPLETE_TYPE_P (type)
5126 || (TREE_CODE (type) == ARRAY_TYPE
5127 && !TYPE_DOMAIN (type)
5128 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
5129 layout_decl (decl, 0);
5131 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
5133 /* An automatic variable with an incomplete type: that is an error.
5134 Don't talk about array types here, since we took care of that
5135 message in grokdeclarator. */
5136 error ("storage size of %qD isn%'t known", decl);
5137 TREE_TYPE (decl) = error_mark_node;
5140 /* Keep this code around in case we later want to control debug info
5141 based on whether a type is "used". (jason 1999-11-11) */
5143 else if (!DECL_EXTERNAL (decl) && MAYBE_CLASS_TYPE_P (ttype))
5144 /* Let debugger know it should output info for this type. */
5145 note_debug_info_needed (ttype);
5147 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
5148 note_debug_info_needed (DECL_CONTEXT (decl));
5151 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
5152 && DECL_SIZE (decl) != NULL_TREE
5153 && ! TREE_CONSTANT (DECL_SIZE (decl)))
5155 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
5156 constant_expression_warning (DECL_SIZE (decl));
5159 error ("storage size of %qD isn%'t constant", decl);
5160 TREE_TYPE (decl) = error_mark_node;
5165 /* If a local static variable is declared in an inline function, or if
5166 we have a weak definition, we must endeavor to create only one
5167 instance of the variable at link-time. */
5170 maybe_commonize_var (tree decl)
5172 /* Static data in a function with comdat linkage also has comdat
5174 if (TREE_STATIC (decl)
5175 /* Don't mess with __FUNCTION__. */
5176 && ! DECL_ARTIFICIAL (decl)
5177 && DECL_FUNCTION_SCOPE_P (decl)
5178 && vague_linkage_p (DECL_CONTEXT (decl)))
5182 /* With weak symbols, we simply make the variable COMDAT;
5183 that will cause copies in multiple translations units to
5185 comdat_linkage (decl);
5189 if (DECL_INITIAL (decl) == NULL_TREE
5190 || DECL_INITIAL (decl) == error_mark_node)
5192 /* Without weak symbols, we can use COMMON to merge
5193 uninitialized variables. */
5194 TREE_PUBLIC (decl) = 1;
5195 DECL_COMMON (decl) = 1;
5199 /* While for initialized variables, we must use internal
5200 linkage -- which means that multiple copies will not
5202 TREE_PUBLIC (decl) = 0;
5203 DECL_COMMON (decl) = 0;
5204 if (warning_at (DECL_SOURCE_LOCATION (decl), 0,
5205 "sorry: semantics of inline function static "
5206 "data %q#D are wrong (you%'ll wind up "
5207 "with multiple copies)", decl))
5208 inform (DECL_SOURCE_LOCATION (decl),
5209 "you can work around this by removing the initializer");
5215 /* Issue an error message if DECL is an uninitialized const variable. */
5218 check_for_uninitialized_const_var (tree decl)
5220 tree type = strip_array_types (TREE_TYPE (decl));
5222 /* ``Unless explicitly declared extern, a const object does not have
5223 external linkage and must be initialized. ($8.4; $12.1)'' ARM
5226 && TREE_CODE (type) != REFERENCE_TYPE
5227 && (CP_TYPE_CONST_P (type) || var_in_constexpr_fn (decl))
5228 && !DECL_INITIAL (decl))
5230 tree field = default_init_uninitialized_part (type);
5234 if (CP_TYPE_CONST_P (type))
5235 permerror (DECL_SOURCE_LOCATION (decl),
5236 "uninitialized const %qD", decl);
5239 error_at (DECL_SOURCE_LOCATION (decl),
5240 "uninitialized variable %qD in %<constexpr%> function",
5242 cp_function_chain->invalid_constexpr = true;
5245 if (CLASS_TYPE_P (type))
5247 tree defaulted_ctor;
5249 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (type)),
5250 "%q#T has no user-provided default constructor", type);
5251 defaulted_ctor = in_class_defaulted_default_constructor (type);
5253 inform (DECL_SOURCE_LOCATION (defaulted_ctor),
5254 "constructor is not user-provided because it is "
5255 "explicitly defaulted in the class body");
5256 inform (0, "and the implicitly-defined constructor does not "
5257 "initialize %q+#D", field);
5262 /* Structure holding the current initializer being processed by reshape_init.
5263 CUR is a pointer to the current element being processed, END is a pointer
5264 after the last element present in the initializer. */
5265 typedef struct reshape_iterator_t
5267 constructor_elt *cur;
5268 constructor_elt *end;
5271 static tree reshape_init_r (tree, reshape_iter *, bool, tsubst_flags_t);
5273 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
5274 returned is the next FIELD_DECL (possibly FIELD itself) that can be
5275 initialized. If there are no more such fields, the return value
5279 next_initializable_field (tree field)
5282 && (TREE_CODE (field) != FIELD_DECL
5283 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
5284 || DECL_ARTIFICIAL (field)))
5285 field = DECL_CHAIN (field);
5290 /* Subroutine of reshape_init_array and reshape_init_vector, which does
5291 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
5292 INTEGER_CST representing the size of the array minus one (the maximum index),
5293 or NULL_TREE if the array was declared without specifying the size. D is
5294 the iterator within the constructor. */
5297 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d,
5298 tsubst_flags_t complain)
5301 bool sized_array_p = (max_index && TREE_CONSTANT (max_index));
5302 unsigned HOST_WIDE_INT max_index_cst = 0;
5303 unsigned HOST_WIDE_INT index;
5305 /* The initializer for an array is always a CONSTRUCTOR. */
5306 new_init = build_constructor (init_list_type_node, NULL);
5310 /* Minus 1 is used for zero sized arrays. */
5311 if (integer_all_onesp (max_index))
5314 if (tree_fits_uhwi_p (max_index))
5315 max_index_cst = tree_to_uhwi (max_index);
5316 /* sizetype is sign extended, not zero extended. */
5318 max_index_cst = tree_to_uhwi (fold_convert (size_type_node, max_index));
5321 /* Loop until there are no more initializers. */
5323 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
5327 constructor_elt *old_cur = d->cur;
5329 check_array_designated_initializer (d->cur, index);
5330 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false,
5332 if (elt_init == error_mark_node)
5333 return error_mark_node;
5334 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init),
5335 size_int (index), elt_init);
5336 if (!TREE_CONSTANT (elt_init))
5337 TREE_CONSTANT (new_init) = false;
5339 /* This can happen with an invalid initializer (c++/54501). */
5340 if (d->cur == old_cur && !sized_array_p)
5347 /* Subroutine of reshape_init_r, processes the initializers for arrays.
5348 Parameters are the same of reshape_init_r. */
5351 reshape_init_array (tree type, reshape_iter *d, tsubst_flags_t complain)
5353 tree max_index = NULL_TREE;
5355 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
5357 if (TYPE_DOMAIN (type))
5358 max_index = array_type_nelts (type);
5360 return reshape_init_array_1 (TREE_TYPE (type), max_index, d, complain);
5363 /* Subroutine of reshape_init_r, processes the initializers for vectors.
5364 Parameters are the same of reshape_init_r. */
5367 reshape_init_vector (tree type, reshape_iter *d, tsubst_flags_t complain)
5369 tree max_index = NULL_TREE;
5371 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
5373 if (COMPOUND_LITERAL_P (d->cur->value))
5375 tree value = d->cur->value;
5376 if (!same_type_p (TREE_TYPE (value), type))
5378 if (complain & tf_error)
5379 error ("invalid type %qT as initializer for a vector of type %qT",
5380 TREE_TYPE (d->cur->value), type);
5381 value = error_mark_node;
5387 /* For a vector, we initialize it as an array of the appropriate size. */
5388 if (TREE_CODE (type) == VECTOR_TYPE)
5389 max_index = size_int (TYPE_VECTOR_SUBPARTS (type) - 1);
5391 return reshape_init_array_1 (TREE_TYPE (type), max_index, d, complain);
5394 /* Subroutine of reshape_init_r, processes the initializers for classes
5395 or union. Parameters are the same of reshape_init_r. */
5398 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p,
5399 tsubst_flags_t complain)
5404 gcc_assert (CLASS_TYPE_P (type));
5406 /* The initializer for a class is always a CONSTRUCTOR. */
5407 new_init = build_constructor (init_list_type_node, NULL);
5408 field = next_initializable_field (TYPE_FIELDS (type));
5414 An initializer for an aggregate member that is an
5415 empty class shall have the form of an empty
5416 initializer-list {}. */
5417 if (!first_initializer_p)
5419 if (complain & tf_error)
5420 error ("initializer for %qT must be brace-enclosed", type);
5421 return error_mark_node;
5426 /* Loop through the initializable fields, gathering initializers. */
5427 while (d->cur != d->end)
5430 constructor_elt *old_cur = d->cur;
5432 /* Handle designated initializers, as an extension. */
5435 if (d->cur->index == error_mark_node)
5436 return error_mark_node;
5438 if (TREE_CODE (d->cur->index) == FIELD_DECL)
5439 /* We already reshaped this. */
5440 gcc_assert (d->cur->index == field);
5441 else if (TREE_CODE (d->cur->index) == IDENTIFIER_NODE)
5442 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
5445 if (complain & tf_error)
5446 error ("%<[%E] =%> used in a GNU-style designated initializer"
5447 " for class %qT", d->cur->index, type);
5448 return error_mark_node;
5451 if (!field || TREE_CODE (field) != FIELD_DECL)
5453 if (complain & tf_error)
5454 error ("%qT has no non-static data member named %qD", type,
5456 return error_mark_node;
5460 /* If we processed all the member of the class, we are done. */
5464 field_init = reshape_init_r (TREE_TYPE (field), d,
5465 /*first_initializer_p=*/false, complain);
5466 if (field_init == error_mark_node)
5467 return error_mark_node;
5469 if (d->cur == old_cur && d->cur->index)
5471 /* This can happen with an invalid initializer for a flexible
5472 array member (c++/54441). */
5473 if (complain & tf_error)
5474 error ("invalid initializer for %q#D", field);
5475 return error_mark_node;
5478 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
5482 When a union is initialized with a brace-enclosed
5483 initializer, the braces shall only contain an
5484 initializer for the first member of the union. */
5485 if (TREE_CODE (type) == UNION_TYPE)
5488 field = next_initializable_field (DECL_CHAIN (field));
5494 /* Subroutine of reshape_init_r. We're in a context where C99 initializer
5495 designators are not valid; either complain or return true to indicate
5496 that reshape_init_r should return error_mark_node. */
5499 has_designator_problem (reshape_iter *d, tsubst_flags_t complain)
5503 if (complain & tf_error)
5504 error ("C99 designator %qE outside aggregate initializer",
5512 /* Subroutine of reshape_init, which processes a single initializer (part of
5513 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
5514 iterator within the CONSTRUCTOR which points to the initializer to process.
5515 FIRST_INITIALIZER_P is true if this is the first initializer of the
5516 outermost CONSTRUCTOR node. */
5519 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p,
5520 tsubst_flags_t complain)
5522 tree init = d->cur->value;
5524 if (error_operand_p (init))
5525 return error_mark_node;
5527 if (first_initializer_p && !CP_AGGREGATE_TYPE_P (type)
5528 && has_designator_problem (d, complain))
5529 return error_mark_node;
5531 if (TREE_CODE (type) == COMPLEX_TYPE)
5533 /* A complex type can be initialized from one or two initializers,
5534 but braces are not elided. */
5536 if (BRACE_ENCLOSED_INITIALIZER_P (init))
5538 if (CONSTRUCTOR_NELTS (init) > 2)
5540 if (complain & tf_error)
5541 error ("too many initializers for %qT", type);
5543 return error_mark_node;
5546 else if (first_initializer_p && d->cur != d->end)
5548 vec<constructor_elt, va_gc> *v = 0;
5549 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, init);
5550 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, d->cur->value);
5551 if (has_designator_problem (d, complain))
5552 return error_mark_node;
5554 init = build_constructor (init_list_type_node, v);
5559 /* A non-aggregate type is always initialized with a single
5561 if (!CP_AGGREGATE_TYPE_P (type))
5563 /* It is invalid to initialize a non-aggregate type with a
5564 brace-enclosed initializer before C++0x.
5565 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
5566 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
5567 a CONSTRUCTOR (with a record type). */
5568 if (TREE_CODE (init) == CONSTRUCTOR
5569 /* Don't complain about a capture-init. */
5570 && !CONSTRUCTOR_IS_DIRECT_INIT (init)
5571 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
5573 if (SCALAR_TYPE_P (type))
5575 if (cxx_dialect < cxx11
5576 /* Isn't value-initialization. */
5577 || CONSTRUCTOR_NELTS (init) > 0)
5579 if (complain & tf_error)
5580 error ("braces around scalar initializer for type %qT",
5582 init = error_mark_node;
5586 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5593 /* "If T is a class type and the initializer list has a single element of
5594 type cv U, where U is T or a class derived from T, the object is
5595 initialized from that element." Even if T is an aggregate. */
5596 if (cxx_dialect >= cxx11 && (CLASS_TYPE_P (type) || VECTOR_TYPE_P (type))
5597 && first_initializer_p
5598 && d->end - d->cur == 1
5599 && reference_related_p (type, TREE_TYPE (init)))
5607 All implicit type conversions (clause _conv_) are considered when
5608 initializing the aggregate member with an initializer from an
5609 initializer-list. If the initializer can initialize a member,
5610 the member is initialized. Otherwise, if the member is itself a
5611 non-empty subaggregate, brace elision is assumed and the
5612 initializer is considered for the initialization of the first
5613 member of the subaggregate. */
5614 if (TREE_CODE (init) != CONSTRUCTOR
5615 /* But don't try this for the first initializer, since that would be
5616 looking through the outermost braces; A a2 = { a1 }; is not a
5617 valid aggregate initialization. */
5618 && !first_initializer_p
5619 && (same_type_ignoring_top_level_qualifiers_p (type, TREE_TYPE (init))
5620 || can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL,
5627 /* [dcl.init.string]
5629 A char array (whether plain char, signed char, or unsigned char)
5630 can be initialized by a string-literal (optionally enclosed in
5631 braces); a wchar_t array can be initialized by a wide
5632 string-literal (optionally enclosed in braces). */
5633 if (TREE_CODE (type) == ARRAY_TYPE
5634 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
5636 tree str_init = init;
5638 /* Strip one level of braces if and only if they enclose a single
5639 element (as allowed by [dcl.init.string]). */
5640 if (!first_initializer_p
5641 && TREE_CODE (str_init) == CONSTRUCTOR
5642 && vec_safe_length (CONSTRUCTOR_ELTS (str_init)) == 1)
5644 str_init = (*CONSTRUCTOR_ELTS (str_init))[0].value;
5647 /* If it's a string literal, then it's the initializer for the array
5648 as a whole. Otherwise, continue with normal initialization for
5649 array types (one value per array element). */
5650 if (TREE_CODE (str_init) == STRING_CST)
5652 if (has_designator_problem (d, complain))
5653 return error_mark_node;
5659 /* The following cases are about aggregates. If we are not within a full
5660 initializer already, and there is not a CONSTRUCTOR, it means that there
5661 is a missing set of braces (that is, we are processing the case for
5662 which reshape_init exists). */
5663 if (!first_initializer_p)
5665 if (TREE_CODE (init) == CONSTRUCTOR)
5667 if (TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init)))
5668 /* There is no need to reshape pointer-to-member function
5669 initializers, as they are always constructed correctly
5670 by the front end. */
5672 else if (COMPOUND_LITERAL_P (init))
5673 /* For a nested compound literal, there is no need to reshape since
5674 brace elision is not allowed. Even if we decided to allow it,
5675 we should add a call to reshape_init in finish_compound_literal,
5676 before calling digest_init, so changing this code would still
5677 not be necessary. */
5678 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
5682 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5683 return reshape_init (type, init, complain);
5687 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
5691 /* Dispatch to specialized routines. */
5692 if (CLASS_TYPE_P (type))
5693 return reshape_init_class (type, d, first_initializer_p, complain);
5694 else if (TREE_CODE (type) == ARRAY_TYPE)
5695 return reshape_init_array (type, d, complain);
5696 else if (TREE_CODE (type) == VECTOR_TYPE)
5697 return reshape_init_vector (type, d, complain);
5702 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
5703 brace-enclosed aggregate initializer.
5705 INIT is the CONSTRUCTOR containing the list of initializers describing
5706 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
5707 It may not presently match the shape of the TYPE; for example:
5709 struct S { int a; int b; };
5710 struct S a[] = { 1, 2, 3, 4 };
5712 Here INIT will hold a vector of four elements, rather than a
5713 vector of two elements, each itself a vector of two elements. This
5714 routine transforms INIT from the former form into the latter. The
5715 revised CONSTRUCTOR node is returned. */
5718 reshape_init (tree type, tree init, tsubst_flags_t complain)
5720 vec<constructor_elt, va_gc> *v;
5724 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5726 v = CONSTRUCTOR_ELTS (init);
5728 /* An empty constructor does not need reshaping, and it is always a valid
5730 if (vec_safe_is_empty (v))
5733 /* Recurse on this CONSTRUCTOR. */
5735 d.end = d.cur + v->length ();
5737 new_init = reshape_init_r (type, &d, true, complain);
5738 if (new_init == error_mark_node)
5739 return error_mark_node;
5741 /* Make sure all the element of the constructor were used. Otherwise,
5742 issue an error about exceeding initializers. */
5745 if (complain & tf_error)
5746 error ("too many initializers for %qT", type);
5748 return error_mark_node;
5754 /* Verify array initializer. Returns true if errors have been reported. */
5757 check_array_initializer (tree decl, tree type, tree init)
5759 tree element_type = TREE_TYPE (type);
5761 /* The array type itself need not be complete, because the
5762 initializer may tell us how many elements are in the array.
5763 But, the elements of the array must be complete. */
5764 if (!COMPLETE_TYPE_P (complete_type (element_type)))
5767 error ("elements of array %q#D have incomplete type", decl);
5769 error ("elements of array %q#T have incomplete type", type);
5772 /* A compound literal can't have variable size. */
5774 && ((COMPLETE_TYPE_P (type) && !TREE_CONSTANT (TYPE_SIZE (type)))
5775 || !TREE_CONSTANT (TYPE_SIZE (element_type))))
5777 error ("variable-sized compound literal");
5783 /* Subroutine of check_initializer; args are passed down from that function.
5784 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
5787 build_aggr_init_full_exprs (tree decl, tree init, int flags)
5790 gcc_assert (stmts_are_full_exprs_p ());
5791 return build_aggr_init (decl, init, flags, tf_warning_or_error);
5794 /* Verify INIT (the initializer for DECL), and record the
5795 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
5796 grok_reference_init.
5798 If the return value is non-NULL, it is an expression that must be
5799 evaluated dynamically to initialize DECL. */
5802 check_initializer (tree decl, tree init, int flags, vec<tree, va_gc> **cleanups)
5804 tree type = TREE_TYPE (decl);
5805 tree init_code = NULL;
5808 /* Things that are going to be initialized need to have complete
5810 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
5812 if (DECL_HAS_VALUE_EXPR_P (decl))
5814 /* A variable with DECL_HAS_VALUE_EXPR_P set is just a placeholder,
5815 it doesn't have storage to be initialized. */
5816 gcc_assert (init == NULL_TREE);
5820 if (type == error_mark_node)
5821 /* We will have already complained. */
5824 if (TREE_CODE (type) == ARRAY_TYPE)
5826 if (check_array_initializer (decl, type, init))
5829 else if (!COMPLETE_TYPE_P (type))
5831 error ("%q#D has incomplete type", decl);
5832 TREE_TYPE (decl) = error_mark_node;
5836 /* There is no way to make a variable-sized class type in GNU C++. */
5837 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
5839 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5841 int init_len = vec_safe_length (CONSTRUCTOR_ELTS (init));
5842 if (SCALAR_TYPE_P (type))
5846 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5847 init = build_zero_init (type, NULL_TREE, false);
5849 else if (init_len != 1 && TREE_CODE (type) != COMPLEX_TYPE)
5851 error ("scalar object %qD requires one element in initializer",
5853 TREE_TYPE (decl) = error_mark_node;
5859 if (TREE_CODE (decl) == CONST_DECL)
5861 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
5863 DECL_INITIAL (decl) = init;
5865 gcc_assert (init != NULL_TREE);
5868 else if (!init && DECL_REALLY_EXTERN (decl))
5870 else if (init || type_build_ctor_call (type)
5871 || TREE_CODE (type) == REFERENCE_TYPE)
5873 if (TREE_CODE (type) == REFERENCE_TYPE)
5875 init = grok_reference_init (decl, type, init, flags);
5876 flags |= LOOKUP_ALREADY_DIGESTED;
5879 check_for_uninitialized_const_var (decl);
5880 /* Do not reshape constructors of vectors (they don't need to be
5882 else if (BRACE_ENCLOSED_INITIALIZER_P (init))
5884 if (is_std_init_list (type))
5886 init = perform_implicit_conversion (type, init,
5887 tf_warning_or_error);
5888 flags |= LOOKUP_ALREADY_DIGESTED;
5890 else if (TYPE_NON_AGGREGATE_CLASS (type))
5892 /* Don't reshape if the class has constructors. */
5893 if (cxx_dialect == cxx98)
5894 error ("in C++98 %qD must be initialized by constructor, "
5898 else if (TREE_CODE (type) == VECTOR_TYPE && TYPE_VECTOR_OPAQUE (type))
5900 error ("opaque vector types cannot be initialized");
5901 init = error_mark_node;
5905 init = reshape_init (type, init, tf_warning_or_error);
5906 flags |= LOOKUP_NO_NARROWING;
5909 else if (TREE_CODE (init) == TREE_LIST
5910 && TREE_TYPE (init) != unknown_type_node
5911 && !MAYBE_CLASS_TYPE_P (type))
5913 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
5915 /* We get here with code like `int a (2);' */
5916 init = build_x_compound_expr_from_list (init, ELK_INIT,
5917 tf_warning_or_error);
5920 /* If DECL has an array type without a specific bound, deduce the
5921 array size from the initializer. */
5922 maybe_deduce_size_from_array_init (decl, init);
5923 type = TREE_TYPE (decl);
5924 if (type == error_mark_node)
5927 if ((type_build_ctor_call (type) || CLASS_TYPE_P (type))
5928 && !(flags & LOOKUP_ALREADY_DIGESTED)
5929 && !(init && BRACE_ENCLOSED_INITIALIZER_P (init)
5930 && CP_AGGREGATE_TYPE_P (type)
5931 && (CLASS_TYPE_P (type)
5932 || !TYPE_NEEDS_CONSTRUCTING (type)
5933 || type_has_extended_temps (type))))
5935 init_code = build_aggr_init_full_exprs (decl, init, flags);
5937 /* A constructor call is a non-trivial initializer even if
5938 it isn't explicitly written. */
5939 if (TREE_SIDE_EFFECTS (init_code))
5940 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = true;
5942 /* If this is a constexpr initializer, expand_default_init will
5943 have returned an INIT_EXPR rather than a CALL_EXPR. In that
5944 case, pull the initializer back out and pass it down into
5945 store_init_value. */
5946 while (TREE_CODE (init_code) == EXPR_STMT
5947 || TREE_CODE (init_code) == CONVERT_EXPR)
5948 init_code = TREE_OPERAND (init_code, 0);
5949 if (TREE_CODE (init_code) == INIT_EXPR)
5951 init = TREE_OPERAND (init_code, 1);
5952 init_code = NULL_TREE;
5953 /* Don't call digest_init; it's unnecessary and will complain
5954 about aggregate initialization of non-aggregate classes. */
5955 flags |= LOOKUP_ALREADY_DIGESTED;
5957 else if (DECL_DECLARED_CONSTEXPR_P (decl))
5959 /* Declared constexpr, but no suitable initializer; massage
5960 init appropriately so we can pass it into store_init_value
5962 if (CLASS_TYPE_P (type)
5963 && (!init || TREE_CODE (init) == TREE_LIST))
5965 init = build_functional_cast (type, init, tf_none);
5966 if (TREE_CODE (init) == TARGET_EXPR)
5967 TARGET_EXPR_DIRECT_INIT_P (init) = true;
5969 init_code = NULL_TREE;
5975 if (init && TREE_CODE (init) != TREE_VEC)
5977 /* In aggregate initialization of a variable, each element
5978 initialization is a full-expression because there is no
5979 enclosing expression. */
5980 gcc_assert (stmts_are_full_exprs_p ());
5982 init_code = store_init_value (decl, init, cleanups, flags);
5984 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
5985 && DECL_INITIAL (decl)
5986 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
5987 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
5988 warning (0, "array %qD initialized by parenthesized string literal %qE",
5989 decl, DECL_INITIAL (decl));
5995 if (CLASS_TYPE_P (core_type = strip_array_types (type))
5996 && (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type)
5997 || CLASSTYPE_REF_FIELDS_NEED_INIT (core_type)))
5998 diagnose_uninitialized_cst_or_ref_member (core_type, /*using_new=*/false,
6001 check_for_uninitialized_const_var (decl);
6004 if (init && init != error_mark_node)
6005 init_code = build2 (INIT_EXPR, type, decl, init);
6009 /* We might have set these in cp_finish_decl. */
6010 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = false;
6011 TREE_CONSTANT (decl) = false;
6014 if (init_code && DECL_IN_AGGR_P (decl))
6016 static int explained = 0;
6018 if (cxx_dialect < cxx11)
6019 error ("initializer invalid for static member with constructor");
6021 error ("non-constant in-class initialization invalid for static "
6022 "member %qD", decl);
6025 inform (input_location,
6026 "(an out of class initialization is required)");
6035 /* If DECL is not a local variable, give it RTL. */
6038 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
6040 int toplev = toplevel_bindings_p ();
6042 const char *filename;
6044 /* Set the DECL_ASSEMBLER_NAME for the object. */
6047 /* The `register' keyword, when used together with an
6048 asm-specification, indicates that the variable should be
6049 placed in a particular register. */
6050 if (VAR_P (decl) && DECL_REGISTER (decl))
6052 set_user_assembler_name (decl, asmspec);
6053 DECL_HARD_REGISTER (decl) = 1;
6057 if (TREE_CODE (decl) == FUNCTION_DECL
6058 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
6059 set_builtin_user_assembler_name (decl, asmspec);
6060 set_user_assembler_name (decl, asmspec);
6064 /* Handle non-variables up front. */
6067 rest_of_decl_compilation (decl, toplev, at_eof);
6071 /* If we see a class member here, it should be a static data
6073 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
6075 gcc_assert (TREE_STATIC (decl));
6076 /* An in-class declaration of a static data member should be
6077 external; it is only a declaration, and not a definition. */
6078 if (init == NULL_TREE)
6079 gcc_assert (DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl));
6082 /* We don't create any RTL for local variables. */
6083 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
6086 /* We defer emission of local statics until the corresponding
6087 DECL_EXPR is expanded. */
6088 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
6090 /* We try to defer namespace-scope static constants so that they are
6091 not emitted into the object file unnecessarily. */
6092 filename = LOCATION_FILE (input_location);
6093 if (!DECL_VIRTUAL_P (decl)
6094 && TREE_READONLY (decl)
6095 && DECL_INITIAL (decl) != NULL_TREE
6096 && DECL_INITIAL (decl) != error_mark_node
6098 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
6100 && !TREE_PUBLIC (decl))
6102 /* Fool with the linkage of static consts according to #pragma
6104 struct c_fileinfo *finfo = get_fileinfo (filename);
6105 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
6107 TREE_PUBLIC (decl) = 1;
6108 DECL_EXTERNAL (decl) = finfo->interface_only;
6113 /* Likewise for template instantiations. */
6114 else if (DECL_LANG_SPECIFIC (decl)
6115 && DECL_IMPLICIT_INSTANTIATION (decl))
6118 /* If we're not deferring, go ahead and assemble the variable. */
6120 rest_of_decl_compilation (decl, toplev, at_eof);
6123 /* walk_tree helper for wrap_temporary_cleanups, below. */
6126 wrap_cleanups_r (tree *stmt_p, int *walk_subtrees, void *data)
6128 /* Stop at types or full-expression boundaries. */
6129 if (TYPE_P (*stmt_p)
6130 || TREE_CODE (*stmt_p) == CLEANUP_POINT_EXPR)
6136 if (TREE_CODE (*stmt_p) == TARGET_EXPR)
6138 tree guard = (tree)data;
6139 tree tcleanup = TARGET_EXPR_CLEANUP (*stmt_p);
6141 tcleanup = build2 (TRY_CATCH_EXPR, void_type_node, tcleanup, guard);
6142 /* Tell honor_protect_cleanup_actions to handle this as a separate
6144 TRY_CATCH_IS_CLEANUP (tcleanup) = 1;
6146 TARGET_EXPR_CLEANUP (*stmt_p) = tcleanup;
6152 /* We're initializing a local variable which has a cleanup GUARD. If there
6153 are any temporaries used in the initializer INIT of this variable, we
6154 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
6155 variable will be cleaned up properly if one of them throws.
6157 Unfortunately, there's no way to express this properly in terms of
6158 nesting, as the regions for the temporaries overlap the region for the
6159 variable itself; if there are two temporaries, the variable needs to be
6160 the first thing destroyed if either of them throws. However, we only
6161 want to run the variable's cleanup if it actually got constructed. So
6162 we need to guard the temporary cleanups with the variable's cleanup if
6163 they are run on the normal path, but not if they are run on the
6164 exceptional path. We implement this by telling
6165 honor_protect_cleanup_actions to strip the variable cleanup from the
6166 exceptional path. */
6169 wrap_temporary_cleanups (tree init, tree guard)
6171 cp_walk_tree_without_duplicates (&init, wrap_cleanups_r, (void *)guard);
6174 /* Generate code to initialize DECL (a local variable). */
6177 initialize_local_var (tree decl, tree init)
6179 tree type = TREE_TYPE (decl);
6183 gcc_assert (VAR_P (decl)
6184 || TREE_CODE (decl) == RESULT_DECL);
6185 gcc_assert (!TREE_STATIC (decl));
6187 if (DECL_SIZE (decl) == NULL_TREE)
6189 /* If we used it already as memory, it must stay in memory. */
6190 DECL_INITIAL (decl) = NULL_TREE;
6191 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
6195 if (type == error_mark_node)
6198 /* Compute and store the initial value. */
6199 already_used = TREE_USED (decl) || TREE_USED (type);
6200 if (TREE_USED (type))
6201 DECL_READ_P (decl) = 1;
6203 /* Generate a cleanup, if necessary. */
6204 cleanup = cxx_maybe_build_cleanup (decl, tf_warning_or_error);
6206 /* Perform the initialization. */
6209 tree rinit = (TREE_CODE (init) == INIT_EXPR
6210 ? TREE_OPERAND (init, 1) : NULL_TREE);
6211 if (rinit && !TREE_SIDE_EFFECTS (rinit))
6213 /* Stick simple initializers in DECL_INITIAL so that
6214 -Wno-init-self works (c++/34772). */
6215 gcc_assert (TREE_OPERAND (init, 0) == decl);
6216 DECL_INITIAL (decl) = rinit;
6218 if (warn_init_self && TREE_CODE (type) == REFERENCE_TYPE)
6222 warning_at (DECL_SOURCE_LOCATION (decl),
6224 "reference %qD is initialized with itself", decl);
6229 int saved_stmts_are_full_exprs_p;
6231 /* If we're only initializing a single object, guard the
6232 destructors of any temporaries used in its initializer with
6233 its destructor. This isn't right for arrays because each
6234 element initialization is a full-expression. */
6235 if (cleanup && TREE_CODE (type) != ARRAY_TYPE)
6236 wrap_temporary_cleanups (init, cleanup);
6238 gcc_assert (building_stmt_list_p ());
6239 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
6240 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
6241 finish_expr_stmt (init);
6242 current_stmt_tree ()->stmts_are_full_exprs_p =
6243 saved_stmts_are_full_exprs_p;
6247 /* Set this to 0 so we can tell whether an aggregate which was
6248 initialized was ever used. Don't do this if it has a
6249 destructor, so we don't complain about the 'resource
6250 allocation is initialization' idiom. Now set
6251 attribute((unused)) on types so decls of that type will be
6252 marked used. (see TREE_USED, above.) */
6253 if (TYPE_NEEDS_CONSTRUCTING (type)
6255 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
6256 && DECL_NAME (decl))
6257 TREE_USED (decl) = 0;
6258 else if (already_used)
6259 TREE_USED (decl) = 1;
6262 finish_decl_cleanup (decl, cleanup);
6265 /* DECL is a VAR_DECL for a compiler-generated variable with static
6266 storage duration (like a virtual table) whose initializer is a
6267 compile-time constant. Initialize the variable and provide it to the
6271 initialize_artificial_var (tree decl, vec<constructor_elt, va_gc> *v)
6274 gcc_assert (DECL_ARTIFICIAL (decl));
6275 init = build_constructor (TREE_TYPE (decl), v);
6276 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
6277 DECL_INITIAL (decl) = init;
6278 DECL_INITIALIZED_P (decl) = 1;
6279 determine_visibility (decl);
6280 layout_var_decl (decl);
6281 maybe_commonize_var (decl);
6282 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
6285 /* INIT is the initializer for a variable, as represented by the
6286 parser. Returns true iff INIT is type-dependent. */
6289 type_dependent_init_p (tree init)
6291 if (TREE_CODE (init) == TREE_LIST)
6292 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
6293 return any_type_dependent_elements_p (init);
6294 else if (TREE_CODE (init) == CONSTRUCTOR)
6295 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
6297 vec<constructor_elt, va_gc> *elts;
6301 elts = CONSTRUCTOR_ELTS (init);
6302 nelts = vec_safe_length (elts);
6303 for (i = 0; i < nelts; ++i)
6304 if (type_dependent_init_p ((*elts)[i].value))
6308 /* It must be a simple expression, e.g., int i = 3; */
6309 return type_dependent_expression_p (init);
6314 /* INIT is the initializer for a variable, as represented by the
6315 parser. Returns true iff INIT is value-dependent. */
6318 value_dependent_init_p (tree init)
6320 if (TREE_CODE (init) == TREE_LIST)
6321 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
6322 return any_value_dependent_elements_p (init);
6323 else if (TREE_CODE (init) == CONSTRUCTOR)
6324 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
6326 vec<constructor_elt, va_gc> *elts;
6330 elts = CONSTRUCTOR_ELTS (init);
6331 nelts = vec_safe_length (elts);
6332 for (i = 0; i < nelts; ++i)
6333 if (value_dependent_init_p ((*elts)[i].value))
6337 /* It must be a simple expression, e.g., int i = 3; */
6338 return value_dependent_expression_p (init);
6343 /* Finish processing of a declaration;
6344 install its line number and initial value.
6345 If the length of an array type is not known before,
6346 it must be determined now, from the initial value, or it is an error.
6348 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
6349 true, then INIT is an integral constant expression.
6351 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
6352 if the (init) syntax was used. */
6355 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
6356 tree asmspec_tree, int flags)
6359 vec<tree, va_gc> *cleanups = NULL;
6360 const char *asmspec = NULL;
6361 int was_readonly = 0;
6362 bool var_definition_p = false;
6365 if (decl == error_mark_node)
6370 error ("assignment (not initialization) in declaration");
6374 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
6375 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
6376 gcc_assert (TREE_CODE (decl) != PARM_DECL);
6378 type = TREE_TYPE (decl);
6379 if (type == error_mark_node)
6382 /* If a name was specified, get the string. */
6383 if (at_namespace_scope_p ())
6384 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
6385 if (asmspec_tree && asmspec_tree != error_mark_node)
6386 asmspec = TREE_STRING_POINTER (asmspec_tree);
6388 if (current_class_type
6389 && CP_DECL_CONTEXT (decl) == current_class_type
6390 && TYPE_BEING_DEFINED (current_class_type)
6391 && !CLASSTYPE_TEMPLATE_INSTANTIATION (current_class_type)
6392 && (DECL_INITIAL (decl) || init))
6393 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
6395 if (TREE_CODE (decl) != FUNCTION_DECL
6396 && (auto_node = type_uses_auto (type)))
6399 if (init == NULL_TREE)
6401 if (DECL_LANG_SPECIFIC (decl)
6402 && DECL_TEMPLATE_INSTANTIATION (decl)
6403 && !DECL_TEMPLATE_INSTANTIATED (decl))
6405 /* init is null because we're deferring instantiating the
6406 initializer until we need it. Well, we need it now. */
6407 instantiate_decl (decl, /*defer_ok*/true, /*expl*/false);
6411 error ("declaration of %q#D has no initializer", decl);
6412 TREE_TYPE (decl) = error_mark_node;
6416 if (TREE_CODE (d_init) == TREE_LIST)
6417 d_init = build_x_compound_expr_from_list (d_init, ELK_INIT,
6418 tf_warning_or_error);
6419 d_init = resolve_nondeduced_context (d_init);
6420 type = TREE_TYPE (decl) = do_auto_deduction (type, d_init,
6422 if (type == error_mark_node)
6424 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
6427 if (!ensure_literal_type_for_constexpr_object (decl))
6428 DECL_DECLARED_CONSTEXPR_P (decl) = 0;
6431 && DECL_CLASS_SCOPE_P (decl)
6432 && DECL_INITIALIZED_IN_CLASS_P (decl))
6433 check_static_variable_definition (decl, type);
6435 if (init && TREE_CODE (decl) == FUNCTION_DECL)
6438 if (init == ridpointers[(int)RID_DELETE])
6440 /* FIXME check this is 1st decl. */
6441 DECL_DELETED_FN (decl) = 1;
6442 DECL_DECLARED_INLINE_P (decl) = 1;
6443 DECL_INITIAL (decl) = error_mark_node;
6444 FOR_EACH_CLONE (clone, decl)
6446 DECL_DELETED_FN (clone) = 1;
6447 DECL_DECLARED_INLINE_P (clone) = 1;
6448 DECL_INITIAL (clone) = error_mark_node;
6452 else if (init == ridpointers[(int)RID_DEFAULT])
6454 if (defaultable_fn_check (decl))
6455 DECL_DEFAULTED_FN (decl) = 1;
6457 DECL_INITIAL (decl) = NULL_TREE;
6461 if (init && VAR_P (decl))
6463 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
6464 /* If DECL is a reference, then we want to know whether init is a
6465 reference constant; init_const_expr_p as passed tells us whether
6466 it's an rvalue constant. */
6467 if (TREE_CODE (type) == REFERENCE_TYPE)
6468 init_const_expr_p = potential_constant_expression (init);
6469 if (init_const_expr_p)
6471 /* Set these flags now for templates. We'll update the flags in
6472 store_init_value for instantiations. */
6473 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
6474 if (decl_maybe_constant_var_p (decl))
6475 TREE_CONSTANT (decl) = 1;
6479 if (processing_template_decl)
6481 bool type_dependent_p;
6483 /* Add this declaration to the statement-tree. */
6484 if (at_function_scope_p ())
6485 add_decl_expr (decl);
6487 type_dependent_p = dependent_type_p (type);
6489 if (check_for_bare_parameter_packs (init))
6492 DECL_INITIAL (decl) = NULL_TREE;
6495 /* Generally, initializers in templates are expanded when the
6496 template is instantiated. But, if DECL is a variable constant
6497 then it can be used in future constant expressions, so its value
6498 must be available. */
6500 if (!VAR_P (decl) || dependent_type_p (type))
6501 /* We can't do anything if the decl has dependent type. */;
6503 && init_const_expr_p
6504 && !type_dependent_p
6505 && TREE_CODE (type) != REFERENCE_TYPE
6506 && decl_maybe_constant_var_p (decl)
6507 && !type_dependent_init_p (init)
6508 && !value_dependent_init_p (init))
6510 /* This variable seems to be a non-dependent constant, so process
6511 its initializer. If check_initializer returns non-null the
6512 initialization wasn't constant after all. */
6514 cleanups = make_tree_vector ();
6515 init_code = check_initializer (decl, init, flags, &cleanups);
6516 if (init_code == NULL_TREE)
6518 release_tree_vector (cleanups);
6520 else if (!DECL_PRETTY_FUNCTION_P (decl))
6522 /* Deduce array size even if the initializer is dependent. */
6523 maybe_deduce_size_from_array_init (decl, init);
6524 /* And complain about multiple initializers. */
6525 if (init && TREE_CODE (init) == TREE_LIST && TREE_CHAIN (init)
6526 && !MAYBE_CLASS_TYPE_P (type))
6527 init = build_x_compound_expr_from_list (init, ELK_INIT,
6528 tf_warning_or_error);
6532 DECL_INITIAL (decl) = init;
6536 /* Just store non-static data member initializers for later. */
6537 if (init && TREE_CODE (decl) == FIELD_DECL)
6538 DECL_INITIAL (decl) = init;
6540 /* Take care of TYPE_DECLs up front. */
6541 if (TREE_CODE (decl) == TYPE_DECL)
6543 if (type != error_mark_node
6544 && MAYBE_CLASS_TYPE_P (type) && DECL_NAME (decl))
6546 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
6547 warning (0, "shadowing previous type declaration of %q#D", decl);
6548 set_identifier_type_value (DECL_NAME (decl), decl);
6551 /* If we have installed this as the canonical typedef for this
6552 type, and that type has not been defined yet, delay emitting
6553 the debug information for it, as we will emit it later. */
6554 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
6555 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
6556 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
6558 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl),
6563 /* A reference will be modified here, as it is initialized. */
6564 if (! DECL_EXTERNAL (decl)
6565 && TREE_READONLY (decl)
6566 && TREE_CODE (type) == REFERENCE_TYPE)
6569 TREE_READONLY (decl) = 0;
6574 /* If this is a local variable that will need a mangled name,
6575 register it now. We must do this before processing the
6576 initializer for the variable, since the initialization might
6577 require a guard variable, and since the mangled name of the
6578 guard variable will depend on the mangled name of this
6580 if (DECL_FUNCTION_SCOPE_P (decl)
6581 && TREE_STATIC (decl)
6582 && !DECL_ARTIFICIAL (decl))
6584 push_local_name (decl);
6585 if (DECL_CONSTRUCTOR_P (current_function_decl)
6586 || DECL_DESTRUCTOR_P (current_function_decl))
6587 /* Normally local_decls is populated during GIMPLE lowering,
6588 but [cd]tors are never actually compiled directly. We need
6589 to put statics on the list so we can deal with the label
6590 address extension. FIXME. */
6591 add_local_decl (cfun, decl);
6594 /* Convert the initializer to the type of DECL, if we have not
6595 already initialized DECL. */
6596 if (!DECL_INITIALIZED_P (decl)
6597 /* If !DECL_EXTERNAL then DECL is being defined. In the
6598 case of a static data member initialized inside the
6599 class-specifier, there can be an initializer even if DECL
6600 is *not* defined. */
6601 && (!DECL_EXTERNAL (decl) || init))
6603 if (TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6606 = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
6607 /* Allow libjava/prims.cc define primitive classes. */
6608 if (init != NULL_TREE
6609 || jclass == NULL_TREE
6610 || TREE_CODE (jclass) != TYPE_DECL
6611 || !POINTER_TYPE_P (TREE_TYPE (jclass))
6612 || !same_type_ignoring_top_level_qualifiers_p
6613 (type, TREE_TYPE (TREE_TYPE (jclass))))
6614 error ("Java object %qD not allocated with %<new%>", decl);
6617 cleanups = make_tree_vector ();
6618 init = check_initializer (decl, init, flags, &cleanups);
6624 The memory occupied by any object of static storage
6625 duration is zero-initialized at program startup before
6626 any other initialization takes place.
6628 We cannot create an appropriate initializer until after
6629 the type of DECL is finalized. If DECL_INITIAL is set,
6630 then the DECL is statically initialized, and any
6631 necessary zero-initialization has already been performed. */
6632 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
6633 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
6634 /*nelts=*/NULL_TREE,
6635 /*static_storage_p=*/true);
6636 /* Remember that the initialization for this variable has
6638 DECL_INITIALIZED_P (decl) = 1;
6639 /* This declaration is the definition of this variable,
6640 unless we are initializing a static data member within
6641 the class specifier. */
6642 if (!DECL_EXTERNAL (decl))
6643 var_definition_p = true;
6645 /* If the variable has an array type, lay out the type, even if
6646 there is no initializer. It is valid to index through the
6647 array, and we must get TYPE_ALIGN set correctly on the array
6649 else if (TREE_CODE (type) == ARRAY_TYPE)
6652 if (TREE_STATIC (decl)
6653 && !at_function_scope_p ()
6654 && current_function_decl == NULL)
6655 /* So decl is a global variable or a static member of a
6656 non local class. Record the types it uses
6657 so that we can decide later to emit debug info for them. */
6658 record_types_used_by_current_var_decl (decl);
6660 else if (TREE_CODE (decl) == FIELD_DECL
6661 && TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6662 error ("non-static data member %qD has Java class type", decl);
6664 /* Add this declaration to the statement-tree. This needs to happen
6665 after the call to check_initializer so that the DECL_EXPR for a
6666 reference temp is added before the DECL_EXPR for the reference itself. */
6667 if (DECL_FUNCTION_SCOPE_P (decl))
6669 /* If we're building a variable sized type, and we might be
6670 reachable other than via the top of the current binding
6671 level, then create a new BIND_EXPR so that we deallocate
6672 the object at the right time. */
6675 && !TREE_CONSTANT (DECL_SIZE (decl))
6676 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list))
6679 bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL);
6680 TREE_SIDE_EFFECTS (bind) = 1;
6682 BIND_EXPR_BODY (bind) = push_stmt_list ();
6684 add_decl_expr (decl);
6687 /* Let the middle end know about variables and functions -- but not
6688 static data members in uninstantiated class templates. */
6689 if (VAR_OR_FUNCTION_DECL_P (decl))
6693 layout_var_decl (decl);
6694 maybe_commonize_var (decl);
6697 /* This needs to happen after the linkage is set. */
6698 determine_visibility (decl);
6700 if (var_definition_p && TREE_STATIC (decl))
6702 /* If a TREE_READONLY variable needs initialization
6703 at runtime, it is no longer readonly and we need to
6704 avoid MEM_READONLY_P being set on RTL created for it. */
6707 if (TREE_READONLY (decl))
6708 TREE_READONLY (decl) = 0;
6711 else if (was_readonly)
6712 TREE_READONLY (decl) = 1;
6714 /* Likewise if it needs destruction. */
6715 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
6716 TREE_READONLY (decl) = 0;
6719 make_rtl_for_nonlocal_decl (decl, init, asmspec);
6721 /* Check for abstractness of the type. Notice that there is no
6722 need to strip array types here since the check for those types
6723 is already done within create_array_type_for_decl. */
6724 abstract_virtuals_error (decl, type);
6726 if (TREE_TYPE (decl) == error_mark_node)
6727 /* No initialization required. */
6729 else if (TREE_CODE (decl) == FUNCTION_DECL)
6733 if (init == ridpointers[(int)RID_DEFAULT])
6735 /* An out-of-class default definition is defined at
6736 the point where it is explicitly defaulted. */
6737 if (DECL_DELETED_FN (decl))
6738 maybe_explain_implicit_delete (decl);
6739 else if (DECL_INITIAL (decl) == error_mark_node)
6740 synthesize_method (decl);
6743 error ("function %q#D is initialized like a variable", decl);
6745 /* else no initialization required. */
6747 else if (DECL_EXTERNAL (decl)
6748 && ! (DECL_LANG_SPECIFIC (decl)
6749 && DECL_NOT_REALLY_EXTERN (decl)))
6752 DECL_INITIAL (decl) = init;
6754 /* A variable definition. */
6755 else if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
6756 /* Initialize the local variable. */
6757 initialize_local_var (decl, init);
6759 /* If a variable is defined, and then a subsequent
6760 definition with external linkage is encountered, we will
6761 get here twice for the same variable. We want to avoid
6762 calling expand_static_init more than once. For variables
6763 that are not static data members, we can call
6764 expand_static_init only when we actually process the
6765 initializer. It is not legal to redeclare a static data
6766 member, so this issue does not arise in that case. */
6767 else if (var_definition_p && TREE_STATIC (decl))
6768 expand_static_init (decl, init);
6771 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
6772 reference, insert it in the statement-tree now. */
6776 FOR_EACH_VEC_ELT (*cleanups, i, t)
6777 push_cleanup (decl, t, false);
6778 release_tree_vector (cleanups);
6782 TREE_READONLY (decl) = 1;
6784 invoke_plugin_callbacks (PLUGIN_FINISH_DECL, decl);
6787 /* Returns a declaration for a VAR_DECL as if:
6789 extern "C" TYPE NAME;
6791 had been seen. Used to create compiler-generated global
6795 declare_global_var (tree name, tree type)
6799 push_to_top_level ();
6800 decl = build_decl (input_location, VAR_DECL, name, type);
6801 TREE_PUBLIC (decl) = 1;
6802 DECL_EXTERNAL (decl) = 1;
6803 DECL_ARTIFICIAL (decl) = 1;
6804 /* If the user has explicitly declared this variable (perhaps
6805 because the code we are compiling is part of a low-level runtime
6806 library), then it is possible that our declaration will be merged
6807 with theirs by pushdecl. */
6808 decl = pushdecl (decl);
6809 cp_finish_decl (decl, NULL_TREE, false, NULL_TREE, 0);
6810 pop_from_top_level ();
6815 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
6816 if "__cxa_atexit" is not being used) corresponding to the function
6817 to be called when the program exits. */
6820 get_atexit_fn_ptr_type (void)
6824 if (!atexit_fn_ptr_type_node)
6827 if (flag_use_cxa_atexit
6828 && !targetm.cxx.use_atexit_for_cxa_atexit ())
6829 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
6830 arg_type = ptr_type_node;
6832 /* The parameter to "atexit" is "void (*)(void)". */
6833 arg_type = NULL_TREE;
6835 fn_type = build_function_type_list (void_type_node,
6836 arg_type, NULL_TREE);
6837 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
6840 return atexit_fn_ptr_type_node;
6843 /* Returns a pointer to the `atexit' function. Note that if
6844 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
6845 `__cxa_atexit' function specified in the IA64 C++ ABI. */
6848 get_atexit_node (void)
6854 bool use_aeabi_atexit;
6859 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6861 /* The declaration for `__cxa_atexit' is:
6863 int __cxa_atexit (void (*)(void *), void *, void *)
6865 We build up the argument types and then the function type
6867 tree argtype0, argtype1, argtype2;
6869 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
6870 /* First, build the pointer-to-function type for the first
6872 fn_ptr_type = get_atexit_fn_ptr_type ();
6873 /* Then, build the rest of the argument types. */
6874 argtype2 = ptr_type_node;
6875 if (use_aeabi_atexit)
6877 argtype1 = fn_ptr_type;
6878 argtype0 = ptr_type_node;
6882 argtype1 = ptr_type_node;
6883 argtype0 = fn_ptr_type;
6885 /* And the final __cxa_atexit type. */
6886 fn_type = build_function_type_list (integer_type_node,
6887 argtype0, argtype1, argtype2,
6889 if (use_aeabi_atexit)
6890 name = "__aeabi_atexit";
6892 name = "__cxa_atexit";
6896 /* The declaration for `atexit' is:
6898 int atexit (void (*)());
6900 We build up the argument types and then the function type
6902 fn_ptr_type = get_atexit_fn_ptr_type ();
6903 /* Build the final atexit type. */
6904 fn_type = build_function_type_list (integer_type_node,
6905 fn_ptr_type, NULL_TREE);
6909 /* Now, build the function declaration. */
6910 push_lang_context (lang_name_c);
6911 atexit_fndecl = build_library_fn_ptr (name, fn_type, ECF_LEAF | ECF_NOTHROW);
6912 mark_used (atexit_fndecl);
6913 pop_lang_context ();
6914 atexit_node = decay_conversion (atexit_fndecl, tf_warning_or_error);
6919 /* Like get_atexit_node, but for thread-local cleanups. */
6922 get_thread_atexit_node (void)
6924 /* The declaration for `__cxa_thread_atexit' is:
6926 int __cxa_thread_atexit (void (*)(void *), void *, void *) */
6927 tree fn_type = build_function_type_list (integer_type_node,
6928 get_atexit_fn_ptr_type (),
6929 ptr_type_node, ptr_type_node,
6932 /* Now, build the function declaration. */
6933 tree atexit_fndecl = build_library_fn_ptr ("__cxa_thread_atexit", fn_type,
6934 ECF_LEAF | ECF_NOTHROW);
6935 return decay_conversion (atexit_fndecl, tf_warning_or_error);
6938 /* Returns the __dso_handle VAR_DECL. */
6941 get_dso_handle_node (void)
6943 if (dso_handle_node)
6944 return dso_handle_node;
6946 /* Declare the variable. */
6947 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
6950 #ifdef HAVE_GAS_HIDDEN
6951 if (dso_handle_node != error_mark_node)
6953 DECL_VISIBILITY (dso_handle_node) = VISIBILITY_HIDDEN;
6954 DECL_VISIBILITY_SPECIFIED (dso_handle_node) = 1;
6958 return dso_handle_node;
6961 /* Begin a new function with internal linkage whose job will be simply
6962 to destroy some particular variable. */
6964 static GTY(()) int start_cleanup_cnt;
6967 start_cleanup_fn (void)
6972 bool use_cxa_atexit = flag_use_cxa_atexit
6973 && !targetm.cxx.use_atexit_for_cxa_atexit ();
6975 push_to_top_level ();
6977 /* No need to mangle this. */
6978 push_lang_context (lang_name_c);
6980 /* Build the name of the function. */
6981 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
6982 /* Build the function declaration. */
6983 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
6984 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
6985 /* It's a function with internal linkage, generated by the
6987 TREE_PUBLIC (fndecl) = 0;
6988 DECL_ARTIFICIAL (fndecl) = 1;
6989 /* Make the function `inline' so that it is only emitted if it is
6990 actually needed. It is unlikely that it will be inlined, since
6991 it is only called via a function pointer, but we avoid unnecessary
6992 emissions this way. */
6993 DECL_DECLARED_INLINE_P (fndecl) = 1;
6994 DECL_INTERFACE_KNOWN (fndecl) = 1;
6995 /* Build the parameter. */
7000 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
7001 DECL_CONTEXT (parmdecl) = fndecl;
7002 TREE_USED (parmdecl) = 1;
7003 DECL_READ_P (parmdecl) = 1;
7004 DECL_ARGUMENTS (fndecl) = parmdecl;
7008 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
7010 pop_lang_context ();
7012 return current_function_decl;
7015 /* Finish the cleanup function begun by start_cleanup_fn. */
7018 end_cleanup_fn (void)
7020 expand_or_defer_fn (finish_function (0));
7022 pop_from_top_level ();
7025 /* Generate code to handle the destruction of DECL, an object with
7026 static storage duration. */
7029 register_dtor_fn (tree decl)
7036 bool ob_parm, dso_parm, use_dtor;
7037 tree arg0, arg1, arg2;
7040 type = TREE_TYPE (decl);
7041 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
7044 /* If we're using "__cxa_atexit" (or "__cxa_thread_atexit" or
7045 "__aeabi_atexit"), and DECL is a class object, we can just pass the
7046 destructor to "__cxa_atexit"; we don't have to build a temporary
7047 function to do the cleanup. */
7048 dso_parm = (flag_use_cxa_atexit
7049 && !targetm.cxx.use_atexit_for_cxa_atexit ());
7050 ob_parm = (DECL_THREAD_LOCAL_P (decl) || dso_parm);
7051 use_dtor = ob_parm && CLASS_TYPE_P (type);
7056 /* Find the destructor. */
7057 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
7058 gcc_assert (idx >= 0);
7059 cleanup = (*CLASSTYPE_METHOD_VEC (type))[idx];
7060 /* Make sure it is accessible. */
7061 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup,
7062 tf_warning_or_error);
7066 /* Call build_cleanup before we enter the anonymous function so
7067 that any access checks will be done relative to the current
7068 scope, rather than the scope of the anonymous function. */
7069 build_cleanup (decl);
7071 /* Now start the function. */
7072 cleanup = start_cleanup_fn ();
7074 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
7075 to the original function, rather than the anonymous one. That
7076 will make the back end think that nested functions are in use,
7077 which causes confusion. */
7078 push_deferring_access_checks (dk_no_check);
7079 fcall = build_cleanup (decl);
7080 pop_deferring_access_checks ();
7082 /* Create the body of the anonymous function. */
7083 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
7084 finish_expr_stmt (fcall);
7085 finish_compound_stmt (compound_stmt);
7089 /* Call atexit with the cleanup function. */
7090 mark_used (cleanup);
7091 cleanup = build_address (cleanup);
7093 if (DECL_THREAD_LOCAL_P (decl))
7094 atex_node = get_thread_atexit_node ();
7096 atex_node = get_atexit_node ();
7100 /* We must convert CLEANUP to the type that "__cxa_atexit"
7102 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
7103 /* "__cxa_atexit" will pass the address of DECL to the
7104 cleanup function. */
7106 addr = build_address (decl);
7107 /* The declared type of the parameter to "__cxa_atexit" is
7108 "void *". For plain "T*", we could just let the
7109 machinery in cp_build_function_call convert it -- but if the
7110 type is "cv-qualified T *", then we need to convert it
7111 before passing it in, to avoid spurious errors. */
7112 addr = build_nop (ptr_type_node, addr);
7115 /* Since the cleanup functions we build ignore the address
7116 they're given, there's no reason to pass the actual address
7117 in, and, in general, it's cheaper to pass NULL than any
7119 addr = null_pointer_node;
7122 arg2 = cp_build_addr_expr (get_dso_handle_node (),
7123 tf_warning_or_error);
7125 /* Just pass NULL to the dso handle parm if we don't actually
7126 have a DSO handle on this target. */
7127 arg2 = null_pointer_node;
7133 if (!DECL_THREAD_LOCAL_P (decl)
7134 && targetm.cxx.use_aeabi_atexit ())
7150 return cp_build_function_call_nary (atex_node, tf_warning_or_error,
7151 arg0, arg1, arg2, NULL_TREE);
7154 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
7155 is its initializer. Generate code to handle the construction
7156 and destruction of DECL. */
7159 expand_static_init (tree decl, tree init)
7161 gcc_assert (VAR_P (decl));
7162 gcc_assert (TREE_STATIC (decl));
7164 /* Some variables require no dynamic initialization. */
7166 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
7168 /* Make sure the destructor is callable. */
7169 cxx_maybe_build_cleanup (decl, tf_warning_or_error);
7173 if (DECL_THREAD_LOCAL_P (decl) && DECL_GNU_TLS_P (decl)
7174 && !DECL_FUNCTION_SCOPE_P (decl))
7177 error ("non-local variable %qD declared %<__thread%> "
7178 "needs dynamic initialization", decl);
7180 error ("non-local variable %qD declared %<__thread%> "
7181 "has a non-trivial destructor", decl);
7182 static bool informed;
7185 inform (DECL_SOURCE_LOCATION (decl),
7186 "C++11 %<thread_local%> allows dynamic initialization "
7193 if (DECL_FUNCTION_SCOPE_P (decl))
7195 /* Emit code to perform this initialization but once. */
7196 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
7197 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
7198 tree guard, guard_addr;
7200 /* We don't need thread-safety code for thread-local vars. */
7201 bool thread_guard = (flag_threadsafe_statics
7202 && !DECL_THREAD_LOCAL_P (decl));
7204 /* Emit code to perform this initialization but once. This code
7207 static <type> guard;
7208 if (!guard.first_byte) {
7209 if (__cxa_guard_acquire (&guard)) {
7212 // Do initialization.
7213 flag = true; __cxa_guard_release (&guard);
7214 // Register variable for destruction at end of program.
7216 if (!flag) __cxa_guard_abort (&guard);
7220 Note that the `flag' variable is only set to 1 *after* the
7221 initialization is complete. This ensures that an exception,
7222 thrown during the construction, will cause the variable to
7223 reinitialized when we pass through this code again, as per:
7227 If the initialization exits by throwing an exception, the
7228 initialization is not complete, so it will be tried again
7229 the next time control enters the declaration.
7231 This process should be thread-safe, too; multiple threads
7232 should not be able to initialize the variable more than
7235 /* Create the guard variable. */
7236 guard = get_guard (decl);
7238 /* This optimization isn't safe on targets with relaxed memory
7239 consistency. On such targets we force synchronization in
7240 __cxa_guard_acquire. */
7241 if (!targetm.relaxed_ordering || !thread_guard)
7243 /* Begin the conditional initialization. */
7244 if_stmt = begin_if_stmt ();
7245 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
7246 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
7251 tree vfntype = NULL_TREE;
7252 tree acquire_name, release_name, abort_name;
7253 tree acquire_fn, release_fn, abort_fn;
7254 guard_addr = build_address (guard);
7256 acquire_name = get_identifier ("__cxa_guard_acquire");
7257 release_name = get_identifier ("__cxa_guard_release");
7258 abort_name = get_identifier ("__cxa_guard_abort");
7259 acquire_fn = identifier_global_value (acquire_name);
7260 release_fn = identifier_global_value (release_name);
7261 abort_fn = identifier_global_value (abort_name);
7263 acquire_fn = push_library_fn
7264 (acquire_name, build_function_type_list (integer_type_node,
7265 TREE_TYPE (guard_addr),
7267 NULL_TREE, ECF_NOTHROW | ECF_LEAF);
7268 if (!release_fn || !abort_fn)
7269 vfntype = build_function_type_list (void_type_node,
7270 TREE_TYPE (guard_addr),
7273 release_fn = push_library_fn (release_name, vfntype, NULL_TREE,
7274 ECF_NOTHROW | ECF_LEAF);
7276 abort_fn = push_library_fn (abort_name, vfntype, NULL_TREE,
7277 ECF_NOTHROW | ECF_LEAF);
7279 inner_if_stmt = begin_if_stmt ();
7280 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
7283 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
7284 begin = get_target_expr (boolean_false_node);
7285 flag = TARGET_EXPR_SLOT (begin);
7287 TARGET_EXPR_CLEANUP (begin)
7288 = build3 (COND_EXPR, void_type_node, flag,
7290 build_call_n (abort_fn, 1, guard_addr));
7291 CLEANUP_EH_ONLY (begin) = 1;
7293 /* Do the initialization itself. */
7294 init = add_stmt_to_compound (begin, init);
7295 init = add_stmt_to_compound
7296 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
7297 init = add_stmt_to_compound
7298 (init, build_call_n (release_fn, 1, guard_addr));
7301 init = add_stmt_to_compound (init, set_guard (guard));
7303 /* Use atexit to register a function for destroying this static
7305 init = add_stmt_to_compound (init, register_dtor_fn (decl));
7307 finish_expr_stmt (init);
7311 finish_compound_stmt (inner_then_clause);
7312 finish_then_clause (inner_if_stmt);
7313 finish_if_stmt (inner_if_stmt);
7316 if (!targetm.relaxed_ordering || !thread_guard)
7318 finish_compound_stmt (then_clause);
7319 finish_then_clause (if_stmt);
7320 finish_if_stmt (if_stmt);
7323 else if (DECL_THREAD_LOCAL_P (decl))
7324 tls_aggregates = tree_cons (init, decl, tls_aggregates);
7326 static_aggregates = tree_cons (init, decl, static_aggregates);
7330 /* Make TYPE a complete type based on INITIAL_VALUE.
7331 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
7332 2 if there was no information (in which case assume 0 if DO_DEFAULT),
7333 3 if the initializer list is empty (in pedantic mode). */
7336 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
7339 tree type, elt_type;
7341 /* Don't get confused by a CONSTRUCTOR for some other type. */
7342 if (initial_value && TREE_CODE (initial_value) == CONSTRUCTOR
7343 && !BRACE_ENCLOSED_INITIALIZER_P (initial_value))
7348 unsigned HOST_WIDE_INT i;
7351 /* An array of character type can be initialized from a
7352 brace-enclosed string constant.
7354 FIXME: this code is duplicated from reshape_init. Probably
7355 we should just call reshape_init here? */
7356 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
7357 && TREE_CODE (initial_value) == CONSTRUCTOR
7358 && !vec_safe_is_empty (CONSTRUCTOR_ELTS (initial_value)))
7360 vec<constructor_elt, va_gc> *v = CONSTRUCTOR_ELTS (initial_value);
7361 tree value = (*v)[0].value;
7363 if (TREE_CODE (value) == STRING_CST
7364 && v->length () == 1)
7365 initial_value = value;
7368 /* If any of the elements are parameter packs, we can't actually
7369 complete this type now because the array size is dependent. */
7370 if (TREE_CODE (initial_value) == CONSTRUCTOR)
7372 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value),
7375 if (PACK_EXPANSION_P (value))
7381 failure = complete_array_type (ptype, initial_value, do_default);
7383 /* We can create the array before the element type is complete, which
7384 means that we didn't have these two bits set in the original type
7385 either. In completing the type, we are expected to propagate these
7386 bits. See also complete_type which does the same thing for arrays
7389 if (TYPE_DOMAIN (type))
7391 elt_type = TREE_TYPE (type);
7392 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
7393 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
7394 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
7400 /* As above, but either give an error or reject zero-size arrays, depending
7404 cp_complete_array_type_or_error (tree *ptype, tree initial_value,
7405 bool do_default, tsubst_flags_t complain)
7408 bool sfinae = !(complain & tf_error);
7409 /* In SFINAE context we can't be lenient about zero-size arrays. */
7412 failure = cp_complete_array_type (ptype, initial_value, do_default);
7418 /* Not an error. */;
7419 else if (failure == 1)
7420 error ("initializer fails to determine size of %qT", *ptype);
7421 else if (failure == 2)
7424 error ("array size missing in %qT", *ptype);
7426 else if (failure == 3)
7427 error ("zero-size array %qT", *ptype);
7428 *ptype = error_mark_node;
7433 /* Return zero if something is declared to be a member of type
7434 CTYPE when in the context of CUR_TYPE. STRING is the error
7435 message to print in that case. Otherwise, quietly return 1. */
7438 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
7440 if (ctype && ctype != cur_type)
7442 if (flags == DTOR_FLAG)
7443 error ("destructor for alien class %qT cannot be a member", ctype);
7445 error ("constructor for alien class %qT cannot be a member", ctype);
7451 /* Subroutine of `grokdeclarator'. */
7453 /* Generate errors possibly applicable for a given set of specifiers.
7454 This is for ARM $7.1.2. */
7457 bad_specifiers (tree object,
7458 enum bad_spec_place type,
7469 error ("%qD declared as a %<virtual%> variable", object);
7471 error ("%qD declared as an %<inline%> variable", object);
7473 error ("%<const%> and %<volatile%> function specifiers on "
7474 "%qD invalid in variable declaration", object);
7478 error ("%qD declared as a %<virtual%> parameter", object);
7480 error ("%qD declared as an %<inline%> parameter", object);
7482 error ("%<const%> and %<volatile%> function specifiers on "
7483 "%qD invalid in parameter declaration", object);
7487 error ("%qD declared as a %<virtual%> type", object);
7489 error ("%qD declared as an %<inline%> type", object);
7491 error ("%<const%> and %<volatile%> function specifiers on "
7492 "%qD invalid in type declaration", object);
7496 error ("%qD declared as a %<virtual%> field", object);
7498 error ("%qD declared as an %<inline%> field", object);
7500 error ("%<const%> and %<volatile%> function specifiers on "
7501 "%qD invalid in field declaration", object);
7507 error ("%q+D declared as a friend", object);
7509 && (TREE_CODE (object) == TYPE_DECL
7510 || (!TYPE_PTRFN_P (TREE_TYPE (object))
7511 && !TYPE_REFFN_P (TREE_TYPE (object))
7512 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
7513 error ("%q+D declared with an exception specification", object);
7516 /* DECL is a member function or static data member and is presently
7517 being defined. Check that the definition is taking place in a
7521 check_class_member_definition_namespace (tree decl)
7523 /* These checks only apply to member functions and static data
7525 gcc_assert (VAR_OR_FUNCTION_DECL_P (decl));
7526 /* We check for problems with specializations in pt.c in
7527 check_specialization_namespace, where we can issue better
7529 if (processing_specialization)
7531 /* There are no restrictions on the placement of
7532 explicit instantiations. */
7533 if (processing_explicit_instantiation)
7537 A member function definition that appears outside of the
7538 class definition shall appear in a namespace scope enclosing
7539 the class definition.
7543 The definition for a static data member shall appear in a
7544 namespace scope enclosing the member's class definition. */
7545 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
7546 permerror (input_location, "definition of %qD is not in namespace enclosing %qT",
7547 decl, DECL_CONTEXT (decl));
7550 /* Build a PARM_DECL for the "this" parameter. TYPE is the
7551 METHOD_TYPE for a non-static member function; QUALS are the
7552 cv-qualifiers that apply to the function. */
7555 build_this_parm (tree type, cp_cv_quals quals)
7560 cp_cv_quals this_quals;
7562 if (CLASS_TYPE_P (type))
7565 = cp_build_qualified_type (type, quals & ~TYPE_QUAL_RESTRICT);
7566 this_type = build_pointer_type (this_type);
7569 this_type = type_of_this_parm (type);
7570 /* The `this' parameter is implicitly `const'; it cannot be
7572 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
7573 qual_type = cp_build_qualified_type (this_type, this_quals);
7574 parm = build_artificial_parm (this_identifier, qual_type);
7575 cp_apply_type_quals_to_decl (this_quals, parm);
7579 /* DECL is a static member function. Complain if it was declared
7580 with function-cv-quals. */
7583 check_static_quals (tree decl, cp_cv_quals quals)
7585 if (quals != TYPE_UNQUALIFIED)
7586 error ("static member function %q#D declared with type qualifiers",
7590 /* Helper function. Replace the temporary this parameter injected
7591 during cp_finish_omp_declare_simd with the real this parameter. */
7594 declare_simd_adjust_this (tree *tp, int *walk_subtrees, void *data)
7596 tree this_parm = (tree) data;
7597 if (TREE_CODE (*tp) == PARM_DECL
7598 && DECL_NAME (*tp) == this_identifier
7599 && *tp != this_parm)
7601 else if (TYPE_P (*tp))
7606 /* CTYPE is class type, or null if non-class.
7607 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
7609 DECLARATOR is the function's name.
7610 PARMS is a chain of PARM_DECLs for the function.
7611 VIRTUALP is truthvalue of whether the function is virtual or not.
7612 FLAGS are to be passed through to `grokclassfn'.
7613 QUALS are qualifiers indicating whether the function is `const'
7615 RAISES is a list of exceptions that this function can raise.
7616 CHECK is 1 if we must find this method in CTYPE, 0 if we should
7617 not look, and -1 if we should not call `grokclassfn' at all.
7619 SFK is the kind of special function (if any) for the new function.
7621 Returns `NULL_TREE' if something goes wrong, after issuing
7622 applicable error messages. */
7625 grokfndecl (tree ctype,
7629 tree orig_declarator,
7631 enum overload_flags flags,
7633 cp_ref_qualifier rqual,
7640 special_function_kind sfk,
7645 location_t location)
7648 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
7652 type = build_ref_qualified_type (type, rqual);
7654 type = build_exception_variant (type, raises);
7656 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
7658 /* If we have an explicit location, use it, otherwise use whatever
7659 build_lang_decl used (probably input_location). */
7660 if (location != UNKNOWN_LOCATION)
7661 DECL_SOURCE_LOCATION (decl) = location;
7663 if (TREE_CODE (type) == METHOD_TYPE)
7666 parm = build_this_parm (type, quals);
7667 DECL_CHAIN (parm) = parms;
7670 DECL_ARGUMENTS (decl) = parms;
7671 for (t = parms; t; t = DECL_CHAIN (t))
7672 DECL_CONTEXT (t) = decl;
7673 /* Propagate volatile out from type to decl. */
7674 if (TYPE_VOLATILE (type))
7675 TREE_THIS_VOLATILE (decl) = 1;
7677 /* Setup decl according to sfk. */
7680 case sfk_constructor:
7681 case sfk_copy_constructor:
7682 case sfk_move_constructor:
7683 DECL_CONSTRUCTOR_P (decl) = 1;
7685 case sfk_destructor:
7686 DECL_DESTRUCTOR_P (decl) = 1;
7692 /* If pointers to member functions use the least significant bit to
7693 indicate whether a function is virtual, ensure a pointer
7694 to this function will have that bit clear. */
7695 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
7696 && TREE_CODE (type) == METHOD_TYPE
7697 && DECL_ALIGN (decl) < 2 * BITS_PER_UNIT)
7698 DECL_ALIGN (decl) = 2 * BITS_PER_UNIT;
7701 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
7705 ("defining explicit specialization %qD in friend declaration",
7709 tree fns = TREE_OPERAND (orig_declarator, 0);
7710 tree args = TREE_OPERAND (orig_declarator, 1);
7712 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
7714 /* Something like `template <class T> friend void f<T>()'. */
7715 error ("invalid use of template-id %qD in declaration "
7716 "of primary template",
7722 /* A friend declaration of the form friend void f<>(). Record
7723 the information in the TEMPLATE_ID_EXPR. */
7724 SET_DECL_IMPLICIT_INSTANTIATION (decl);
7726 gcc_assert (identifier_p (fns) || TREE_CODE (fns) == OVERLOAD);
7727 DECL_TEMPLATE_INFO (decl) = build_template_info (fns, args);
7729 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
7730 if (TREE_PURPOSE (t)
7731 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
7733 error ("default arguments are not allowed in declaration "
7734 "of friend template specialization %qD",
7740 error ("%<inline%> is not allowed in declaration of friend "
7741 "template specialization %qD",
7744 error ("%<constexpr%> is not allowed in declaration of friend "
7745 "template specialization %qD",
7752 /* If this decl has namespace scope, set that up. */
7754 set_decl_namespace (decl, in_namespace, friendp);
7756 DECL_CONTEXT (decl) = FROB_CONTEXT (current_decl_namespace ());
7758 /* `main' and builtins have implicit 'C' linkage. */
7759 if ((MAIN_NAME_P (declarator)
7760 || (IDENTIFIER_LENGTH (declarator) > 10
7761 && IDENTIFIER_POINTER (declarator)[0] == '_'
7762 && IDENTIFIER_POINTER (declarator)[1] == '_'
7763 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0)
7764 || (targetcm.cxx_implicit_extern_c
7765 && targetcm.cxx_implicit_extern_c(IDENTIFIER_POINTER (declarator))))
7766 && current_lang_name == lang_name_cplusplus
7767 && ctype == NULL_TREE
7768 && DECL_FILE_SCOPE_P (decl))
7769 SET_DECL_LANGUAGE (decl, lang_c);
7771 /* Should probably propagate const out from type to decl I bet (mrs). */
7774 DECL_STATIC_FUNCTION_P (decl) = 1;
7775 DECL_CONTEXT (decl) = ctype;
7779 DECL_DELETED_FN (decl) = 1;
7783 DECL_CONTEXT (decl) = ctype;
7785 check_class_member_definition_namespace (decl);
7788 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7790 if (PROCESSING_REAL_TEMPLATE_DECL_P())
7791 error ("cannot declare %<::main%> to be a template");
7793 error ("cannot declare %<::main%> to be inline");
7795 error ("cannot declare %<::main%> to be constexpr");
7797 error ("cannot declare %<::main%> to be static");
7802 /* Members of anonymous types and local classes have no linkage; make
7803 them internal. If a typedef is made later, this will be changed. */
7804 if (ctype && (TYPE_ANONYMOUS_P (ctype)
7805 || decl_function_context (TYPE_MAIN_DECL (ctype))))
7808 if (publicp && cxx_dialect == cxx98)
7810 /* [basic.link]: A name with no linkage (notably, the name of a class
7811 or enumeration declared in a local scope) shall not be used to
7812 declare an entity with linkage.
7814 DR 757 relaxes this restriction for C++0x. */
7815 no_linkage_error (decl);
7818 TREE_PUBLIC (decl) = publicp;
7821 DECL_INTERFACE_KNOWN (decl) = 1;
7822 DECL_NOT_REALLY_EXTERN (decl) = 1;
7825 /* If the declaration was declared inline, mark it as such. */
7828 DECL_DECLARED_INLINE_P (decl) = 1;
7830 DECL_COMDAT (decl) = 1;
7833 DECL_DECLARED_CONSTEXPR_P (decl) = true;
7835 DECL_EXTERNAL (decl) = 1;
7836 if (TREE_CODE (type) == FUNCTION_TYPE)
7841 ? G_("static member function %qD cannot have cv-qualifier")
7842 : G_("non-member function %qD cannot have cv-qualifier"),
7844 quals = TYPE_UNQUALIFIED;
7850 ? G_("static member function %qD cannot have ref-qualifier")
7851 : G_("non-member function %qD cannot have ref-qualifier"),
7853 rqual = REF_QUAL_NONE;
7857 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
7858 && !grok_op_properties (decl, /*complain=*/true))
7860 else if (UDLIT_OPER_P (DECL_NAME (decl)))
7862 bool long_long_unsigned_p;
7864 const char *suffix = NULL;
7865 /* [over.literal]/6: Literal operators shall not have C linkage. */
7866 if (DECL_LANGUAGE (decl) == lang_c)
7868 error ("literal operator with C linkage");
7872 if (DECL_NAMESPACE_SCOPE_P (decl))
7874 if (!check_literal_operator_args (decl, &long_long_unsigned_p,
7877 error ("%qD has invalid argument list", decl);
7881 suffix = UDLIT_OP_SUFFIX (DECL_NAME (decl));
7882 if (long_long_unsigned_p)
7884 if (cpp_interpret_int_suffix (parse_in, suffix, strlen (suffix)))
7885 warning (0, "integer suffix %<%s%>"
7886 " shadowed by implementation", suffix);
7888 else if (long_double_p)
7890 if (cpp_interpret_float_suffix (parse_in, suffix, strlen (suffix)))
7891 warning (0, "floating point suffix %<%s%>"
7892 " shadowed by implementation", suffix);
7897 error ("%qD must be a non-member function", decl);
7903 /* Make the init_value nonzero so pushdecl knows this is not
7904 tentative. error_mark_node is replaced later with the BLOCK. */
7905 DECL_INITIAL (decl) = error_mark_node;
7907 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
7908 TREE_NOTHROW (decl) = 1;
7910 if (flag_openmp || flag_cilkplus)
7912 /* Adjust "omp declare simd" attributes. */
7913 tree ods = lookup_attribute ("omp declare simd", *attrlist);
7917 for (attr = ods; attr;
7918 attr = lookup_attribute ("omp declare simd", TREE_CHAIN (attr)))
7920 if (TREE_CODE (type) == METHOD_TYPE)
7921 walk_tree (&TREE_VALUE (attr), declare_simd_adjust_this,
7922 DECL_ARGUMENTS (decl), NULL);
7923 if (TREE_VALUE (attr) != NULL_TREE)
7925 tree cl = TREE_VALUE (TREE_VALUE (attr));
7926 cl = c_omp_declare_simd_clauses_to_numbers
7927 (DECL_ARGUMENTS (decl), cl);
7929 TREE_VALUE (TREE_VALUE (attr)) = cl;
7931 TREE_VALUE (attr) = NULL_TREE;
7937 /* Caller will do the rest of this. */
7941 if (ctype != NULL_TREE)
7942 grokclassfn (ctype, decl, flags);
7945 if (cxx_dialect >= cxx11
7946 && DECL_DESTRUCTOR_P (decl)
7947 && !TYPE_BEING_DEFINED (DECL_CONTEXT (decl))
7948 && !processing_template_decl)
7949 deduce_noexcept_on_destructor (decl);
7951 decl = check_explicit_specialization (orig_declarator, decl,
7954 4 * (friendp != 0));
7955 if (decl == error_mark_node)
7958 if (DECL_STATIC_FUNCTION_P (decl))
7959 check_static_quals (decl, quals);
7963 cplus_decl_attributes (&decl, *attrlist, 0);
7964 *attrlist = NULL_TREE;
7967 /* Check main's type after attributes have been applied. */
7968 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7970 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
7973 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
7975 error ("%<::main%> must return %<int%>");
7976 newtype = build_function_type (integer_type_node, oldtypeargs);
7977 TREE_TYPE (decl) = newtype;
7980 check_main_parameter_types (decl);
7983 if (ctype != NULL_TREE
7984 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
7987 tree old_decl = check_classfn (ctype, decl,
7988 (processing_template_decl
7989 > template_class_depth (ctype))
7990 ? current_template_parms
7993 if (old_decl == error_mark_node)
8001 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
8002 /* Because grokfndecl is always supposed to return a
8003 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
8004 here. We depend on our callers to figure out that its
8005 really a template that's being returned. */
8006 old_decl = DECL_TEMPLATE_RESULT (old_decl);
8008 if (DECL_STATIC_FUNCTION_P (old_decl)
8009 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
8011 /* Remove the `this' parm added by grokclassfn. */
8012 revert_static_member_fn (decl);
8013 check_static_quals (decl, quals);
8015 if (DECL_ARTIFICIAL (old_decl))
8017 error ("definition of implicitly-declared %qD", old_decl);
8020 else if (DECL_DEFAULTED_FN (old_decl))
8022 error ("definition of explicitly-defaulted %q+D", decl);
8023 error ("%q+#D explicitly defaulted here", old_decl);
8027 /* Since we've smashed OLD_DECL to its
8028 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
8029 if (TREE_CODE (decl) == TEMPLATE_DECL)
8030 decl = DECL_TEMPLATE_RESULT (decl);
8032 /* Attempt to merge the declarations. This can fail, in
8033 the case of some invalid specialization declarations. */
8034 pushed_scope = push_scope (ctype);
8035 ok = duplicate_decls (decl, old_decl, friendp);
8037 pop_scope (pushed_scope);
8040 error ("no %q#D member function declared in class %qT",
8044 if (ok == error_mark_node)
8050 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
8053 if (ctype == NULL_TREE || check)
8057 DECL_VIRTUAL_P (decl) = 1;
8062 /* decl is a FUNCTION_DECL.
8063 specifiers are the parsed virt-specifiers.
8065 Set flags to reflect the virt-specifiers.
8070 set_virt_specifiers (tree decl, cp_virt_specifiers specifiers)
8072 if (decl == NULL_TREE)
8074 if (specifiers & VIRT_SPEC_OVERRIDE)
8075 DECL_OVERRIDE_P (decl) = 1;
8076 if (specifiers & VIRT_SPEC_FINAL)
8077 DECL_FINAL_P (decl) = 1;
8081 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
8082 the linkage that DECL will receive in the object file. */
8085 set_linkage_for_static_data_member (tree decl)
8087 /* A static data member always has static storage duration and
8088 external linkage. Note that static data members are forbidden in
8089 local classes -- the only situation in which a class has
8090 non-external linkage. */
8091 TREE_PUBLIC (decl) = 1;
8092 TREE_STATIC (decl) = 1;
8093 /* For non-template classes, static data members are always put
8094 out in exactly those files where they are defined, just as
8095 with ordinary namespace-scope variables. */
8096 if (!processing_template_decl)
8097 DECL_INTERFACE_KNOWN (decl) = 1;
8100 /* Create a VAR_DECL named NAME with the indicated TYPE.
8102 If SCOPE is non-NULL, it is the class type or namespace containing
8103 the variable. If SCOPE is NULL, the variable should is created in
8104 the innermost enclosing scope. */
8107 grokvardecl (tree type,
8109 tree orig_declarator,
8110 const cp_decl_specifier_seq *declspecs,
8117 tree explicit_scope;
8119 gcc_assert (!name || identifier_p (name));
8121 /* Compute the scope in which to place the variable, but remember
8122 whether or not that scope was explicitly specified by the user. */
8123 explicit_scope = scope;
8126 /* An explicit "extern" specifier indicates a namespace-scope
8128 if (declspecs->storage_class == sc_extern)
8129 scope = current_decl_namespace ();
8130 else if (!at_function_scope_p ())
8131 scope = current_scope ();
8135 && (/* If the variable is a namespace-scope variable declared in a
8136 template, we need DECL_LANG_SPECIFIC. */
8137 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
8138 /* Similarly for namespace-scope variables with language linkage
8140 || (TREE_CODE (scope) == NAMESPACE_DECL
8141 && current_lang_name != lang_name_cplusplus)
8142 /* Similarly for static data members. */
8144 /* Similarly for explicit specializations. */
8146 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)))
8147 decl = build_lang_decl (VAR_DECL, name, type);
8149 decl = build_decl (input_location, VAR_DECL, name, type);
8151 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
8152 set_decl_namespace (decl, explicit_scope, 0);
8154 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
8156 if (declspecs->storage_class == sc_extern)
8158 DECL_THIS_EXTERN (decl) = 1;
8159 DECL_EXTERNAL (decl) = !initialized;
8162 if (DECL_CLASS_SCOPE_P (decl))
8164 set_linkage_for_static_data_member (decl);
8165 /* This function is only called with out-of-class definitions. */
8166 DECL_EXTERNAL (decl) = 0;
8167 check_class_member_definition_namespace (decl);
8169 /* At top level, either `static' or no s.c. makes a definition
8170 (perhaps tentative), and absence of `static' makes it public. */
8171 else if (toplevel_bindings_p ())
8173 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
8174 && (DECL_THIS_EXTERN (decl) || ! constp));
8175 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
8177 /* Not at top level, only `static' makes a static definition. */
8180 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
8181 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
8184 if (decl_spec_seq_has_spec_p (declspecs, ds_thread))
8186 if (DECL_EXTERNAL (decl) || TREE_STATIC (decl))
8187 set_decl_tls_model (decl, decl_default_tls_model (decl));
8188 if (declspecs->gnu_thread_keyword_p)
8189 DECL_GNU_TLS_P (decl) = true;
8192 /* If the type of the decl has no linkage, make sure that we'll
8193 notice that in mark_used. */
8194 if (cxx_dialect > cxx98
8195 && decl_linkage (decl) != lk_none
8196 && DECL_LANG_SPECIFIC (decl) == NULL
8197 && !DECL_EXTERN_C_P (decl)
8198 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
8199 retrofit_lang_decl (decl);
8201 if (TREE_PUBLIC (decl))
8203 /* [basic.link]: A name with no linkage (notably, the name of a class
8204 or enumeration declared in a local scope) shall not be used to
8205 declare an entity with linkage.
8207 DR 757 relaxes this restriction for C++0x. */
8208 if (cxx_dialect < cxx11)
8209 no_linkage_error (decl);
8212 DECL_INTERFACE_KNOWN (decl) = 1;
8214 // Handle explicit specializations and instantiations of variable templates.
8215 if (orig_declarator)
8216 decl = check_explicit_specialization (orig_declarator, decl,
8219 return decl != error_mark_node ? decl : NULL_TREE;
8222 /* Create and return a canonical pointer to member function type, for
8223 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
8226 build_ptrmemfunc_type (tree type)
8231 if (type == error_mark_node)
8234 /* If a canonical type already exists for this type, use it. We use
8235 this method instead of type_hash_canon, because it only does a
8236 simple equality check on the list of field members. */
8238 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
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 t = make_node (RECORD_TYPE);
8251 /* Let the front end know this is a pointer to member function. */
8252 TYPE_PTRMEMFUNC_FLAG (t) = 1;
8254 field = build_decl (input_location, FIELD_DECL, pfn_identifier, type);
8257 field = build_decl (input_location, FIELD_DECL, delta_identifier,
8259 DECL_CHAIN (field) = fields;
8262 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
8264 /* Zap out the name so that the back end will give us the debugging
8265 information for this anonymous RECORD_TYPE. */
8266 TYPE_NAME (t) = NULL_TREE;
8268 /* Cache this pointer-to-member type so that we can find it again
8270 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
8272 if (TYPE_STRUCTURAL_EQUALITY_P (type))
8273 SET_TYPE_STRUCTURAL_EQUALITY (t);
8274 else if (TYPE_CANONICAL (type) != type)
8275 TYPE_CANONICAL (t) = build_ptrmemfunc_type (TYPE_CANONICAL (type));
8280 /* Create and return a pointer to data member type. */
8283 build_ptrmem_type (tree class_type, tree member_type)
8285 if (TREE_CODE (member_type) == METHOD_TYPE)
8287 cp_cv_quals quals = type_memfn_quals (member_type);
8288 cp_ref_qualifier rqual = type_memfn_rqual (member_type);
8289 member_type = build_memfn_type (member_type, class_type, quals, rqual);
8290 return build_ptrmemfunc_type (build_pointer_type (member_type));
8294 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
8295 return build_offset_type (class_type, member_type);
8299 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
8300 Check to see that the definition is valid. Issue appropriate error
8301 messages. Return 1 if the definition is particularly bad, or 0
8305 check_static_variable_definition (tree decl, tree type)
8307 /* Can't check yet if we don't know the type. */
8308 if (dependent_type_p (type))
8310 /* If DECL is declared constexpr, we'll do the appropriate checks
8311 in check_initializer. */
8312 if (DECL_P (decl) && DECL_DECLARED_CONSTEXPR_P (decl))
8314 else if (cxx_dialect >= cxx11 && !INTEGRAL_OR_ENUMERATION_TYPE_P (type))
8316 if (!COMPLETE_TYPE_P (type))
8317 error ("in-class initialization of static data member %q#D of "
8318 "incomplete type", decl);
8319 else if (literal_type_p (type))
8320 permerror (input_location,
8321 "%<constexpr%> needed for in-class initialization of "
8322 "static data member %q#D of non-integral type", decl);
8324 error ("in-class initialization of static data member %q#D of "
8325 "non-literal type", decl);
8329 /* Motion 10 at San Diego: If a static const integral data member is
8330 initialized with an integral constant expression, the initializer
8331 may appear either in the declaration (within the class), or in
8332 the definition, but not both. If it appears in the class, the
8333 member is a member constant. The file-scope definition is always
8335 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
8337 error ("invalid in-class initialization of static data member "
8338 "of non-integral type %qT",
8342 else if (!CP_TYPE_CONST_P (type))
8343 error ("ISO C++ forbids in-class initialization of non-const "
8344 "static member %qD",
8346 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type))
8347 pedwarn (input_location, OPT_Wpedantic, "ISO C++ forbids initialization of member constant "
8348 "%qD of non-integral type %qT", decl, type);
8353 /* *expr_p is part of the TYPE_SIZE of a variably-sized array. If any
8354 SAVE_EXPRs in *expr_p wrap expressions with side-effects, break those
8355 expressions out into temporary variables so that walk_tree doesn't
8356 step into them (c++/15764). */
8359 stabilize_save_expr_r (tree *expr_p, int *walk_subtrees, void *data)
8361 hash_set<tree> *pset = (hash_set<tree> *)data;
8362 tree expr = *expr_p;
8363 if (TREE_CODE (expr) == SAVE_EXPR)
8365 tree op = TREE_OPERAND (expr, 0);
8366 cp_walk_tree (&op, stabilize_save_expr_r, data, pset);
8367 if (TREE_SIDE_EFFECTS (op))
8368 TREE_OPERAND (expr, 0) = get_temp_regvar (TREE_TYPE (op), op);
8371 else if (!EXPR_P (expr) || !TREE_SIDE_EFFECTS (expr))
8376 /* Entry point for the above. */
8379 stabilize_vla_size (tree size)
8381 hash_set<tree> pset;
8382 /* Break out any function calls into temporary variables. */
8383 cp_walk_tree (&size, stabilize_save_expr_r, &pset, &pset);
8386 /* Helper function for compute_array_index_type. Look for SIZEOF_EXPR
8387 not inside of SAVE_EXPR and fold them. */
8390 fold_sizeof_expr_r (tree *expr_p, int *walk_subtrees, void *data)
8392 tree expr = *expr_p;
8393 if (TREE_CODE (expr) == SAVE_EXPR || TYPE_P (expr))
8395 else if (TREE_CODE (expr) == SIZEOF_EXPR)
8397 *(bool *)data = true;
8398 if (SIZEOF_EXPR_TYPE_P (expr))
8399 expr = cxx_sizeof_or_alignof_type (TREE_TYPE (TREE_OPERAND (expr, 0)),
8400 SIZEOF_EXPR, false);
8401 else if (TYPE_P (TREE_OPERAND (expr, 0)))
8402 expr = cxx_sizeof_or_alignof_type (TREE_OPERAND (expr, 0), SIZEOF_EXPR,
8405 expr = cxx_sizeof_or_alignof_expr (TREE_OPERAND (expr, 0), SIZEOF_EXPR,
8407 if (expr == error_mark_node)
8408 expr = size_one_node;
8415 /* Given the SIZE (i.e., number of elements) in an array, compute an
8416 appropriate index type for the array. If non-NULL, NAME is the
8417 name of the thing being declared. */
8420 compute_array_index_type (tree name, tree size, tsubst_flags_t complain)
8425 if (error_operand_p (size))
8426 return error_mark_node;
8428 if (!type_dependent_expression_p (size))
8430 tree type = TREE_TYPE (size);
8432 mark_rvalue_use (size);
8434 if (cxx_dialect < cxx11 && TREE_CODE (size) == NOP_EXPR
8435 && TREE_SIDE_EFFECTS (size))
8436 /* In C++98, we mark a non-constant array bound with a magic
8437 NOP_EXPR with TREE_SIDE_EFFECTS; don't fold in that case. */;
8440 size = instantiate_non_dependent_expr_sfinae (size, complain);
8442 if (CLASS_TYPE_P (type)
8443 && CLASSTYPE_LITERAL_P (type))
8445 size = build_expr_type_conversion (WANT_INT, size, true);
8448 if (!(complain & tf_error))
8449 return error_mark_node;
8451 error ("size of array %qD has non-integral type %qT",
8454 error ("size of array has non-integral type %qT", type);
8455 size = integer_one_node;
8457 if (size == error_mark_node)
8458 return error_mark_node;
8459 type = TREE_TYPE (size);
8462 if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
8463 size = maybe_constant_value (size);
8465 if (!TREE_CONSTANT (size))
8469 if (error_operand_p (size))
8470 return error_mark_node;
8472 /* The array bound must be an integer type. */
8473 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
8475 if (!(complain & tf_error))
8476 return error_mark_node;
8478 error ("size of array %qD has non-integral type %qT", name, type);
8480 error ("size of array has non-integral type %qT", type);
8481 size = integer_one_node;
8482 type = TREE_TYPE (size);
8486 /* A type is dependent if it is...an array type constructed from any
8487 dependent type or whose size is specified by a constant expression
8488 that is value-dependent. */
8489 /* We can only call value_dependent_expression_p on integral constant
8490 expressions; treat non-constant expressions as dependent, too. */
8491 if (processing_template_decl
8492 && (type_dependent_expression_p (size)
8493 || !TREE_CONSTANT (size) || value_dependent_expression_p (size)))
8495 /* We cannot do any checking for a SIZE that isn't known to be
8496 constant. Just build the index type and mark that it requires
8497 structural equality checks. */
8498 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
8499 size, size_one_node));
8500 TYPE_DEPENDENT_P (itype) = 1;
8501 TYPE_DEPENDENT_P_VALID (itype) = 1;
8502 SET_TYPE_STRUCTURAL_EQUALITY (itype);
8506 /* Normally, the array-bound will be a constant. */
8507 if (TREE_CODE (size) == INTEGER_CST)
8509 /* Check to see if the array bound overflowed. Make that an
8510 error, no matter how generous we're being. */
8511 constant_expression_error (size);
8513 /* An array must have a positive number of elements. */
8514 if (tree_int_cst_lt (size, integer_zero_node))
8516 if (!(complain & tf_error))
8517 return error_mark_node;
8519 error ("size of array %qD is negative", name);
8521 error ("size of array is negative");
8522 size = integer_one_node;
8524 /* As an extension we allow zero-sized arrays. */
8525 else if (integer_zerop (size))
8527 if (!(complain & tf_error))
8528 /* We must fail if performing argument deduction (as
8529 indicated by the state of complain), so that
8530 another substitution can be found. */
8531 return error_mark_node;
8532 else if (in_system_header_at (input_location))
8533 /* Allow them in system headers because glibc uses them. */;
8535 pedwarn (input_location, OPT_Wpedantic, "ISO C++ forbids zero-size array %qD", name);
8537 pedwarn (input_location, OPT_Wpedantic, "ISO C++ forbids zero-size array");
8540 else if (TREE_CONSTANT (size)
8541 /* We don't allow VLAs at non-function scopes, or during
8542 tentative template substitution. */
8543 || !at_function_scope_p ()
8544 || !(complain & tf_error))
8546 if (!(complain & tf_error))
8547 return error_mark_node;
8548 /* `(int) &fn' is not a valid array bound. */
8550 error ("size of array %qD is not an integral constant-expression",
8553 error ("size of array is not an integral constant-expression");
8554 size = integer_one_node;
8556 else if (pedantic && warn_vla != 0)
8559 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array %qD", name);
8561 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array");
8563 else if (warn_vla > 0)
8567 "variable length array %qD is used", name);
8570 "variable length array is used");
8573 if (processing_template_decl && !TREE_CONSTANT (size))
8574 /* A variable sized array. */
8575 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
8578 HOST_WIDE_INT saved_processing_template_decl;
8580 /* Compute the index of the largest element in the array. It is
8581 one less than the number of elements in the array. We save
8582 and restore PROCESSING_TEMPLATE_DECL so that computations in
8583 cp_build_binary_op will be appropriately folded. */
8584 saved_processing_template_decl = processing_template_decl;
8585 processing_template_decl = 0;
8586 itype = cp_build_binary_op (input_location,
8588 cp_convert (ssizetype, size, complain),
8589 cp_convert (ssizetype, integer_one_node,
8592 itype = fold (itype);
8593 processing_template_decl = saved_processing_template_decl;
8595 if (!TREE_CONSTANT (itype))
8597 /* A variable sized array. */
8598 itype = variable_size (itype);
8600 if (TREE_CODE (itype) != SAVE_EXPR)
8602 /* Look for SIZEOF_EXPRs in itype and fold them, otherwise
8603 they might survive till gimplification. */
8604 tree newitype = itype;
8606 cp_walk_tree_without_duplicates (&newitype,
8607 fold_sizeof_expr_r, &found);
8609 itype = variable_size (fold (newitype));
8612 stabilize_vla_size (itype);
8614 if (flag_sanitize & SANITIZE_VLA
8615 && do_ubsan_in_current_function ())
8617 /* We have to add 1 -- in the ubsan routine we generate
8618 LE_EXPR rather than LT_EXPR. */
8619 tree t = fold_build2 (PLUS_EXPR, TREE_TYPE (itype), itype,
8620 build_one_cst (TREE_TYPE (itype)));
8621 t = ubsan_instrument_vla (input_location, t);
8622 finish_expr_stmt (t);
8625 /* Make sure that there was no overflow when creating to a signed
8626 index type. (For example, on a 32-bit machine, an array with
8627 size 2^32 - 1 is too big.) */
8628 else if (TREE_CODE (itype) == INTEGER_CST
8629 && TREE_OVERFLOW (itype))
8631 if (!(complain & tf_error))
8632 return error_mark_node;
8633 error ("overflow in array dimension");
8634 TREE_OVERFLOW (itype) = 0;
8638 /* Create and return the appropriate index type. */
8639 itype = build_index_type (itype);
8641 /* If the index type were dependent, we would have returned early, so
8642 remember that it isn't. */
8643 TYPE_DEPENDENT_P (itype) = 0;
8644 TYPE_DEPENDENT_P_VALID (itype) = 1;
8648 /* Returns the scope (if any) in which the entity declared by
8649 DECLARATOR will be located. If the entity was declared with an
8650 unqualified name, NULL_TREE is returned. */
8653 get_scope_of_declarator (const cp_declarator *declarator)
8655 while (declarator && declarator->kind != cdk_id)
8656 declarator = declarator->declarator;
8658 /* If the declarator-id is a SCOPE_REF, the scope in which the
8659 declaration occurs is the first operand. */
8661 && declarator->u.id.qualifying_scope)
8662 return declarator->u.id.qualifying_scope;
8664 /* Otherwise, the declarator is not a qualified name; the entity will
8665 be declared in the current scope. */
8669 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
8670 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
8674 create_array_type_for_decl (tree name, tree type, tree size)
8676 tree itype = NULL_TREE;
8678 /* If things have already gone awry, bail now. */
8679 if (type == error_mark_node || size == error_mark_node)
8680 return error_mark_node;
8682 /* 8.3.4/1: If the type of the identifier of D contains the auto
8683 type-specifier, the program is ill-formed. */
8684 if (type_uses_auto (type))
8686 error ("%qD declared as array of %qT", name, type);
8687 return error_mark_node;
8690 /* If there are some types which cannot be array elements,
8691 issue an error-message and return. */
8692 switch (TREE_CODE (type))
8696 error ("declaration of %qD as array of void", name);
8698 error ("creating array of void");
8699 return error_mark_node;
8703 error ("declaration of %qD as array of functions", name);
8705 error ("creating array of functions");
8706 return error_mark_node;
8708 case REFERENCE_TYPE:
8710 error ("declaration of %qD as array of references", name);
8712 error ("creating array of references");
8713 return error_mark_node;
8717 error ("declaration of %qD as array of function members", name);
8719 error ("creating array of function members");
8720 return error_mark_node;
8728 The constant expressions that specify the bounds of the arrays
8729 can be omitted only for the first member of the sequence. */
8730 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
8733 error ("declaration of %qD as multidimensional array must "
8734 "have bounds for all dimensions except the first",
8737 error ("multidimensional array must have bounds for all "
8738 "dimensions except the first");
8740 return error_mark_node;
8743 /* Figure out the index type for the array. */
8745 itype = compute_array_index_type (name, size, tf_warning_or_error);
8748 T is called the array element type; this type shall not be [...] an
8749 abstract class type. */
8750 abstract_virtuals_error (name, type);
8752 return build_cplus_array_type (type, itype);
8755 /* Check that it's OK to declare a function with the indicated TYPE.
8756 SFK indicates the kind of special function (if any) that this
8757 function is. OPTYPE is the type given in a conversion operator
8758 declaration, or the class type for a constructor/destructor.
8759 Returns the actual return type of the function; that
8760 may be different than TYPE if an error occurs, or for certain
8761 special functions. */
8764 check_special_function_return_type (special_function_kind sfk,
8770 case sfk_constructor:
8772 error ("return type specification for constructor invalid");
8774 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
8775 type = build_pointer_type (optype);
8777 type = void_type_node;
8780 case sfk_destructor:
8782 error ("return type specification for destructor invalid");
8783 /* We can't use the proper return type here because we run into
8784 problems with ambiguous bases and covariant returns.
8785 Java classes are left unchanged because (void *) isn't a valid
8786 Java type, and we don't want to change the Java ABI. */
8787 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
8788 type = build_pointer_type (void_type_node);
8790 type = void_type_node;
8793 case sfk_conversion:
8795 error ("return type specified for %<operator %T%>", optype);
8806 /* A variable or data member (whose unqualified name is IDENTIFIER)
8807 has been declared with the indicated TYPE. If the TYPE is not
8808 acceptable, issue an error message and return a type to use for
8809 error-recovery purposes. */
8812 check_var_type (tree identifier, tree type)
8814 if (VOID_TYPE_P (type))
8817 error ("unnamed variable or field declared void");
8818 else if (identifier_p (identifier))
8820 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
8821 error ("variable or field %qE declared void", identifier);
8824 error ("variable or field declared void");
8825 type = error_mark_node;
8831 /* Given declspecs and a declarator (abstract or otherwise), determine
8832 the name and type of the object declared and construct a DECL node
8835 DECLSPECS points to the representation of declaration-specifier
8836 sequence that precedes declarator.
8838 DECL_CONTEXT says which syntactic context this declaration is in:
8839 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
8840 FUNCDEF for a function definition. Like NORMAL but a few different
8841 error messages in each case. Return value may be zero meaning
8842 this definition is too screwy to try to parse.
8843 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
8844 handle member functions (which have FIELD context).
8845 Return value may be zero meaning this definition is too screwy to
8847 PARM for a parameter declaration (either within a function prototype
8848 or before a function body). Make a PARM_DECL, or return void_type_node.
8849 TPARM for a template parameter declaration.
8850 CATCHPARM for a parameter declaration before a catch clause.
8851 TYPENAME if for a typename (in a cast or sizeof).
8852 Don't make a DECL node; just return the ..._TYPE node.
8853 FIELD for a struct or union field; make a FIELD_DECL.
8854 BITFIELD for a field with specified width.
8856 INITIALIZED is as for start_decl.
8858 ATTRLIST is a pointer to the list of attributes, which may be NULL
8859 if there are none; *ATTRLIST may be modified if attributes from inside
8860 the declarator should be applied to the declaration.
8862 When this function is called, scoping variables (such as
8863 CURRENT_CLASS_TYPE) should reflect the scope in which the
8864 declaration occurs, not the scope in which the new declaration will
8865 be placed. For example, on:
8869 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
8872 Returns a DECL (if a declarator is present), a TYPE (if there is no
8873 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
8877 grokdeclarator (const cp_declarator *declarator,
8878 cp_decl_specifier_seq *declspecs,
8879 enum decl_context decl_context,
8883 tree type = NULL_TREE;
8885 int explicit_intN = 0;
8886 int virtualp, explicitp, friendp, inlinep, staticp;
8887 int explicit_int = 0;
8888 int explicit_char = 0;
8889 int defaulted_int = 0;
8891 tree typedef_decl = NULL_TREE;
8892 const char *name = NULL;
8893 tree typedef_type = NULL_TREE;
8894 /* True if this declarator is a function definition. */
8895 bool funcdef_flag = false;
8896 cp_declarator_kind innermost_code = cdk_error;
8899 /* See the code below that used this. */
8900 tree decl_attr = NULL_TREE;
8903 /* Keep track of what sort of function is being processed
8904 so that we can warn about default return values, or explicit
8905 return values which do not match prescribed defaults. */
8906 special_function_kind sfk = sfk_none;
8908 tree dname = NULL_TREE;
8909 tree ctor_return_type = NULL_TREE;
8910 enum overload_flags flags = NO_SPECIAL;
8911 /* cv-qualifiers that apply to the declarator, for a declaration of
8912 a member function. */
8913 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
8914 /* virt-specifiers that apply to the declarator, for a declaration of
8915 a member function. */
8916 cp_virt_specifiers virt_specifiers = VIRT_SPEC_UNSPECIFIED;
8917 /* ref-qualifier that applies to the declarator, for a declaration of
8918 a member function. */
8919 cp_ref_qualifier rqual = REF_QUAL_NONE;
8920 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
8922 tree raises = NULL_TREE;
8923 int template_count = 0;
8924 tree returned_attrs = NULL_TREE;
8925 tree parms = NULL_TREE;
8926 const cp_declarator *id_declarator;
8927 /* The unqualified name of the declarator; either an
8928 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
8929 tree unqualified_id;
8930 /* The class type, if any, in which this entity is located,
8931 or NULL_TREE if none. Note that this value may be different from
8932 the current class type; for example if an attempt is made to declare
8933 "A::f" inside "B", this value will be "A". */
8934 tree ctype = current_class_type;
8935 /* The NAMESPACE_DECL for the namespace in which this entity is
8936 located. If an unqualified name is used to declare the entity,
8937 this value will be NULL_TREE, even if the entity is located at
8939 tree in_namespace = NULL_TREE;
8940 cp_storage_class storage_class;
8941 bool unsigned_p, signed_p, short_p, long_p, thread_p;
8942 bool type_was_error_mark_node = false;
8943 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
8944 bool template_type_arg = false;
8945 bool template_parm_flag = false;
8946 bool typedef_p = decl_spec_seq_has_spec_p (declspecs, ds_typedef);
8947 bool constexpr_p = decl_spec_seq_has_spec_p (declspecs, ds_constexpr);
8948 bool late_return_type_p = false;
8949 bool array_parameter_p = false;
8950 source_location saved_loc = input_location;
8953 signed_p = decl_spec_seq_has_spec_p (declspecs, ds_signed);
8954 unsigned_p = decl_spec_seq_has_spec_p (declspecs, ds_unsigned);
8955 short_p = decl_spec_seq_has_spec_p (declspecs, ds_short);
8956 long_p = decl_spec_seq_has_spec_p (declspecs, ds_long);
8957 longlong = decl_spec_seq_has_spec_p (declspecs, ds_long_long);
8958 explicit_intN = declspecs->explicit_intN_p;
8959 thread_p = decl_spec_seq_has_spec_p (declspecs, ds_thread);
8961 if (decl_context == FUNCDEF)
8962 funcdef_flag = true, decl_context = NORMAL;
8963 else if (decl_context == MEMFUNCDEF)
8964 funcdef_flag = true, decl_context = FIELD;
8965 else if (decl_context == BITFIELD)
8966 bitfield = 1, decl_context = FIELD;
8967 else if (decl_context == TEMPLATE_TYPE_ARG)
8968 template_type_arg = true, decl_context = TYPENAME;
8969 else if (decl_context == TPARM)
8970 template_parm_flag = true, decl_context = PARM;
8972 if (initialized > 1)
8973 funcdef_flag = true;
8975 /* Look inside a declarator for the name being declared
8976 and get it as a string, for an error message. */
8977 for (id_declarator = declarator;
8979 id_declarator = id_declarator->declarator)
8981 if (id_declarator->kind != cdk_id)
8982 innermost_code = id_declarator->kind;
8984 switch (id_declarator->kind)
8987 if (id_declarator->declarator
8988 && id_declarator->declarator->kind == cdk_id)
8990 sfk = id_declarator->declarator->u.id.sfk;
8991 if (sfk == sfk_destructor)
8998 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
8999 tree decl = id_declarator->u.id.unqualified_name;
9002 if (qualifying_scope)
9004 if (at_function_scope_p ())
9008 A declarator-id shall not be qualified except
9011 None of the cases are permitted in block
9013 if (qualifying_scope == global_namespace)
9014 error ("invalid use of qualified-name %<::%D%>",
9016 else if (TYPE_P (qualifying_scope))
9017 error ("invalid use of qualified-name %<%T::%D%>",
9018 qualifying_scope, decl);
9020 error ("invalid use of qualified-name %<%D::%D%>",
9021 qualifying_scope, decl);
9022 return error_mark_node;
9024 else if (TYPE_P (qualifying_scope))
9026 ctype = qualifying_scope;
9027 if (!MAYBE_CLASS_TYPE_P (ctype))
9029 error ("%q#T is not a class or a namespace", ctype);
9032 else if (innermost_code != cdk_function
9033 && current_class_type
9034 && !uniquely_derived_from_p (ctype,
9035 current_class_type))
9037 error ("invalid use of qualified-name %<%T::%D%>",
9038 qualifying_scope, decl);
9039 return error_mark_node;
9042 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
9043 in_namespace = qualifying_scope;
9045 switch (TREE_CODE (decl))
9051 if (innermost_code != cdk_function)
9053 error ("declaration of %qD as non-function", decl);
9054 return error_mark_node;
9056 else if (!qualifying_scope
9057 && !(current_class_type && at_class_scope_p ()))
9059 error ("declaration of %qD as non-member", decl);
9060 return error_mark_node;
9063 type = TREE_OPERAND (decl, 0);
9065 type = constructor_name (type);
9066 name = identifier_to_locale (IDENTIFIER_POINTER (type));
9071 case TEMPLATE_ID_EXPR:
9073 tree fns = TREE_OPERAND (decl, 0);
9076 if (!identifier_p (dname))
9078 if (variable_template_p (dname))
9079 dname = DECL_NAME (dname);
9082 gcc_assert (is_overloaded_fn (dname));
9083 dname = DECL_NAME (get_first_fn (dname));
9089 case IDENTIFIER_NODE:
9090 if (identifier_p (decl))
9093 if (C_IS_RESERVED_WORD (dname))
9095 error ("declarator-id missing; using reserved word %qD",
9097 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
9099 else if (!IDENTIFIER_TYPENAME_P (dname))
9100 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
9103 gcc_assert (flags == NO_SPECIAL);
9104 flags = TYPENAME_FLAG;
9105 ctor_return_type = TREE_TYPE (dname);
9106 sfk = sfk_conversion;
9107 if (is_typename_at_global_scope (dname))
9108 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
9110 name = "<invalid operator>";
9127 return error_mark_node;
9132 if (id_declarator->kind == cdk_id)
9138 The declarator in a function-definition shall have the form
9139 D1 ( parameter-declaration-clause) ... */
9140 if (funcdef_flag && innermost_code != cdk_function)
9142 error ("function definition does not declare parameters");
9143 return error_mark_node;
9146 if (flags == TYPENAME_FLAG
9147 && innermost_code != cdk_function
9148 && ! (ctype && !declspecs->any_specifiers_p))
9150 error ("declaration of %qD as non-function", dname);
9151 return error_mark_node;
9155 && identifier_p (dname)
9156 && UDLIT_OPER_P (dname)
9157 && innermost_code != cdk_function)
9159 error ("declaration of %qD as non-function", dname);
9160 return error_mark_node;
9163 if (dname && IDENTIFIER_OPNAME_P (dname))
9167 error ("declaration of %qD as %<typedef%>", dname);
9168 return error_mark_node;
9170 else if (decl_context == PARM || decl_context == CATCHPARM)
9172 error ("declaration of %qD as parameter", dname);
9173 return error_mark_node;
9177 /* Anything declared one level down from the top level
9178 must be one of the parameters of a function
9179 (because the body is at least two levels down). */
9181 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
9182 by not allowing C++ class definitions to specify their parameters
9183 with xdecls (must be spec.d in the parmlist).
9185 Since we now wait to push a class scope until we are sure that
9186 we are in a legitimate method context, we must set oldcname
9187 explicitly (since current_class_name is not yet alive).
9189 We also want to avoid calling this a PARM if it is in a namespace. */
9191 if (decl_context == NORMAL && !toplevel_bindings_p ())
9193 cp_binding_level *b = current_binding_level;
9194 current_binding_level = b->level_chain;
9195 if (current_binding_level != 0 && toplevel_bindings_p ())
9196 decl_context = PARM;
9197 current_binding_level = b;
9201 name = decl_context == PARM ? "parameter" : "type name";
9203 if (constexpr_p && typedef_p)
9205 error ("%<constexpr%> cannot appear in a typedef declaration");
9206 return error_mark_node;
9209 /* If there were multiple types specified in the decl-specifier-seq,
9210 issue an error message. */
9211 if (declspecs->multiple_types_p)
9213 error ("two or more data types in declaration of %qs", name);
9214 return error_mark_node;
9217 if (declspecs->conflicting_specifiers_p)
9219 error ("conflicting specifiers in declaration of %qs", name);
9220 return error_mark_node;
9223 /* Extract the basic type from the decl-specifier-seq. */
9224 type = declspecs->type;
9225 if (type == error_mark_node)
9228 type_was_error_mark_node = true;
9230 /* If the entire declaration is itself tagged as deprecated then
9231 suppress reports of deprecated items. */
9232 if (type && TREE_DEPRECATED (type)
9233 && deprecated_state != DEPRECATED_SUPPRESS)
9234 warn_deprecated_use (type, NULL_TREE);
9235 if (type && TREE_CODE (type) == TYPE_DECL)
9237 typedef_decl = type;
9238 type = TREE_TYPE (typedef_decl);
9239 if (TREE_DEPRECATED (type)
9240 && DECL_ARTIFICIAL (typedef_decl)
9241 && deprecated_state != DEPRECATED_SUPPRESS)
9242 warn_deprecated_use (type, NULL_TREE);
9244 /* No type at all: default to `int', and set DEFAULTED_INT
9245 because it was not a user-defined typedef. */
9246 if (type == NULL_TREE)
9248 if (signed_p || unsigned_p || long_p || short_p)
9250 /* These imply 'int'. */
9251 type = integer_type_node;
9254 /* If we just have "complex", it is equivalent to "complex double". */
9255 else if (!longlong && !explicit_intN
9256 && decl_spec_seq_has_spec_p (declspecs, ds_complex))
9258 type = double_type_node;
9259 pedwarn (declspecs->locations[ds_complex], OPT_Wpedantic,
9260 "ISO C++ does not support plain %<complex%> meaning "
9261 "%<double complex%>");
9265 explicit_int = declspecs->explicit_int_p;
9266 explicit_char = declspecs->explicit_char_p;
9269 /* See the code below that used this. */
9271 decl_attr = DECL_ATTRIBUTES (typedef_decl);
9273 typedef_type = type;
9276 if (sfk != sfk_conversion)
9277 ctor_return_type = ctype;
9279 if (sfk != sfk_none)
9280 type = check_special_function_return_type (sfk, type,
9282 else if (type == NULL_TREE)
9288 /* We handle `main' specially here, because 'main () { }' is so
9289 common. With no options, it is allowed. With -Wreturn-type,
9290 it is a warning. It is only an error with -pedantic-errors. */
9291 is_main = (funcdef_flag
9292 && dname && identifier_p (dname)
9293 && MAIN_NAME_P (dname)
9294 && ctype == NULL_TREE
9295 && in_namespace == NULL_TREE
9296 && current_namespace == global_namespace);
9298 if (type_was_error_mark_node)
9299 /* We've already issued an error, don't complain more. */;
9300 else if (in_system_header_at (input_location) || flag_ms_extensions)
9301 /* Allow it, sigh. */;
9303 permerror (input_location, "ISO C++ forbids declaration of %qs with no type", name);
9305 pedwarn (input_location, OPT_Wpedantic,
9306 "ISO C++ forbids declaration of %qs with no type", name);
9308 warning (OPT_Wreturn_type,
9309 "ISO C++ forbids declaration of %qs with no type", name);
9311 type = integer_type_node;
9318 if (! int_n_enabled_p[declspecs->int_n_idx])
9320 error ("%<__int%d%> is not supported by this target",
9321 int_n_data[declspecs->int_n_idx].bitsize);
9322 explicit_intN = false;
9324 else if (pedantic && ! in_system_header_at (input_location))
9325 pedwarn (input_location, OPT_Wpedantic,
9326 "ISO C++ does not support %<__int%d%> for %qs",
9327 int_n_data[declspecs->int_n_idx].bitsize, name);
9330 /* Now process the modifiers that were specified
9331 and check for invalid combinations. */
9333 /* Long double is a special combination. */
9334 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
9337 type = cp_build_qualified_type (long_double_type_node,
9338 cp_type_quals (type));
9341 /* Check all other uses of type modifiers. */
9343 if (unsigned_p || signed_p || long_p || short_p)
9347 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
9348 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
9349 else if (signed_p && unsigned_p)
9350 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
9351 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
9352 error ("%<long long%> invalid for %qs", name);
9353 else if (long_p && TREE_CODE (type) == REAL_TYPE)
9354 error ("%<long%> invalid for %qs", name);
9355 else if (short_p && TREE_CODE (type) == REAL_TYPE)
9356 error ("%<short%> invalid for %qs", name);
9357 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
9358 error ("%<long%> or %<short%> invalid for %qs", name);
9359 else if ((long_p || short_p || explicit_char || explicit_int) && explicit_intN)
9360 error ("%<long%>, %<int%>, %<short%>, or %<char%> invalid for %qs", name);
9361 else if ((long_p || short_p) && explicit_char)
9362 error ("%<long%> or %<short%> specified with char for %qs", name);
9363 else if (long_p && short_p)
9364 error ("%<long%> and %<short%> specified together for %qs", name);
9365 else if (type == char16_type_node || type == char32_type_node)
9367 if (signed_p || unsigned_p)
9368 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
9369 else if (short_p || long_p)
9370 error ("%<short%> or %<long%> invalid for %qs", name);
9375 if (!explicit_int && !defaulted_int && !explicit_char && !explicit_intN && pedantic)
9377 pedwarn (input_location, OPT_Wpedantic,
9378 "long, short, signed or unsigned used invalidly for %qs",
9380 if (flag_pedantic_errors)
9385 /* Discard the type modifiers if they are invalid. */
9396 /* Decide whether an integer type is signed or not.
9397 Optionally treat bitfields as signed by default. */
9401 It is implementation-defined whether a plain (neither
9402 explicitly signed or unsigned) char, short, int, or long
9403 bit-field is signed or unsigned.
9405 Naturally, we extend this to long long as well. Note that
9406 this does not include wchar_t. */
9407 || (bitfield && !flag_signed_bitfields
9409 /* A typedef for plain `int' without `signed' can be
9410 controlled just like plain `int', but a typedef for
9411 `signed int' cannot be so controlled. */
9413 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
9414 && TREE_CODE (type) == INTEGER_TYPE
9415 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
9418 type = int_n_trees[declspecs->int_n_idx].unsigned_type;
9420 type = long_long_unsigned_type_node;
9422 type = long_unsigned_type_node;
9424 type = short_unsigned_type_node;
9425 else if (type == char_type_node)
9426 type = unsigned_char_type_node;
9427 else if (typedef_decl)
9428 type = unsigned_type_for (type);
9430 type = unsigned_type_node;
9432 else if (signed_p && type == char_type_node)
9433 type = signed_char_type_node;
9434 else if (explicit_intN)
9435 type = int_n_trees[declspecs->int_n_idx].signed_type;
9437 type = long_long_integer_type_node;
9439 type = long_integer_type_node;
9441 type = short_integer_type_node;
9443 if (decl_spec_seq_has_spec_p (declspecs, ds_complex))
9445 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
9446 error ("complex invalid for %qs", name);
9447 /* If a modifier is specified, the resulting complex is the complex
9448 form of TYPE. E.g, "complex short" is "complex short int". */
9449 else if (type == integer_type_node)
9450 type = complex_integer_type_node;
9451 else if (type == float_type_node)
9452 type = complex_float_type_node;
9453 else if (type == double_type_node)
9454 type = complex_double_type_node;
9455 else if (type == long_double_type_node)
9456 type = complex_long_double_type_node;
9458 type = build_complex_type (type);
9461 type_quals = TYPE_UNQUALIFIED;
9462 if (decl_spec_seq_has_spec_p (declspecs, ds_const))
9463 type_quals |= TYPE_QUAL_CONST;
9464 if (decl_spec_seq_has_spec_p (declspecs, ds_volatile))
9465 type_quals |= TYPE_QUAL_VOLATILE;
9466 if (decl_spec_seq_has_spec_p (declspecs, ds_restrict))
9467 type_quals |= TYPE_QUAL_RESTRICT;
9468 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
9469 error ("qualifiers are not allowed on declaration of %<operator %T%>",
9472 /* If we're using the injected-class-name to form a compound type or a
9473 declaration, replace it with the underlying class so we don't get
9474 redundant typedefs in the debug output. But if we are returning the
9475 type unchanged, leave it alone so that it's available to
9476 maybe_get_template_decl_from_type_decl. */
9477 if (CLASS_TYPE_P (type)
9478 && DECL_SELF_REFERENCE_P (TYPE_NAME (type))
9479 && type == TREE_TYPE (TYPE_NAME (type))
9480 && (declarator || type_quals))
9481 type = DECL_ORIGINAL_TYPE (TYPE_NAME (type));
9483 type_quals |= cp_type_quals (type);
9484 type = cp_build_qualified_type_real
9485 (type, type_quals, ((((typedef_decl && !DECL_ARTIFICIAL (typedef_decl))
9486 || declspecs->decltype_p)
9487 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
9488 /* We might have ignored or rejected some of the qualifiers. */
9489 type_quals = cp_type_quals (type);
9492 inlinep = decl_spec_seq_has_spec_p (declspecs, ds_inline);
9493 virtualp = decl_spec_seq_has_spec_p (declspecs, ds_virtual);
9494 explicitp = decl_spec_seq_has_spec_p (declspecs, ds_explicit);
9496 storage_class = declspecs->storage_class;
9497 if (storage_class == sc_static)
9498 staticp = 1 + (decl_context == FIELD);
9500 if (virtualp && staticp == 2)
9502 error ("member %qD cannot be declared both virtual and static", dname);
9503 storage_class = sc_none;
9506 friendp = decl_spec_seq_has_spec_p (declspecs, ds_friend);
9508 /* Issue errors about use of storage classes for parameters. */
9509 if (decl_context == PARM)
9513 error ("typedef declaration invalid in parameter declaration");
9514 return error_mark_node;
9516 else if (template_parm_flag && storage_class != sc_none)
9518 error ("storage class specified for template parameter %qs", name);
9519 return error_mark_node;
9521 else if (storage_class == sc_static
9522 || storage_class == sc_extern
9524 error ("storage class specifiers invalid in parameter declarations");
9526 /* Function parameters cannot be constexpr. If we saw one, moan
9527 and pretend it wasn't there. */
9530 error ("a parameter cannot be declared %<constexpr%>");
9535 /* Give error if `virtual' is used outside of class declaration. */
9537 && (current_class_name == NULL_TREE || decl_context != FIELD))
9539 error ("%<virtual%> outside class declaration");
9543 /* Static anonymous unions are dealt with here. */
9544 if (staticp && decl_context == TYPENAME
9546 && ANON_AGGR_TYPE_P (declspecs->type))
9547 decl_context = FIELD;
9549 /* Warn about storage classes that are invalid for certain
9550 kinds of declarations (parameters, typenames, etc.). */
9553 && storage_class != sc_extern
9554 && storage_class != sc_static)
9557 error ("multiple storage classes in declaration of %qs", name);
9560 if (decl_context != NORMAL
9561 && ((storage_class != sc_none
9562 && storage_class != sc_mutable)
9565 if ((decl_context == PARM || decl_context == CATCHPARM)
9566 && (storage_class == sc_register
9567 || storage_class == sc_auto))
9571 else if (decl_context == FIELD
9572 /* C++ allows static class elements. */
9573 && storage_class == sc_static)
9574 /* C++ also allows inlines and signed and unsigned elements,
9575 but in those cases we don't come in here. */
9579 if (decl_context == FIELD)
9580 error ("storage class specified for %qs", name);
9583 if (decl_context == PARM || decl_context == CATCHPARM)
9584 error ("storage class specified for parameter %qs", name);
9586 error ("storage class specified for typename");
9588 if (storage_class == sc_register
9589 || storage_class == sc_auto
9590 || storage_class == sc_extern
9592 storage_class = sc_none;
9595 else if (storage_class == sc_extern && funcdef_flag
9596 && ! toplevel_bindings_p ())
9597 error ("nested function %qs declared %<extern%>", name);
9598 else if (toplevel_bindings_p ())
9600 if (storage_class == sc_auto)
9601 error ("top-level declaration of %qs specifies %<auto%>", name);
9604 && storage_class != sc_extern
9605 && storage_class != sc_static)
9607 if (declspecs->gnu_thread_keyword_p)
9608 pedwarn (input_location, 0, "function-scope %qs implicitly auto and "
9609 "declared %<__thread%>", name);
9611 /* When thread_local is applied to a variable of block scope the
9612 storage-class-specifier static is implied if it does not appear
9614 storage_class = declspecs->storage_class = sc_static;
9618 if (storage_class && friendp)
9620 error ("storage class specifiers invalid in friend function declarations");
9621 storage_class = sc_none;
9626 unqualified_id = NULL_TREE;
9629 unqualified_id = id_declarator->u.id.unqualified_name;
9630 switch (TREE_CODE (unqualified_id))
9633 unqualified_id = TREE_OPERAND (unqualified_id, 0);
9634 if (TYPE_P (unqualified_id))
9635 unqualified_id = constructor_name (unqualified_id);
9638 case IDENTIFIER_NODE:
9639 case TEMPLATE_ID_EXPR:
9647 if (declspecs->std_attributes)
9649 /* Apply the c++11 attributes to the type preceding them. */
9650 input_location = declspecs->locations[ds_std_attribute];
9651 decl_attributes (&type, declspecs->std_attributes, 0);
9652 input_location = saved_loc;
9655 /* Determine the type of the entity declared by recurring on the
9657 for (; declarator; declarator = declarator->declarator)
9659 const cp_declarator *inner_declarator;
9662 if (type == error_mark_node)
9663 return error_mark_node;
9665 attrs = declarator->attributes;
9671 if (declarator == NULL || declarator->kind == cdk_id)
9672 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
9673 if (declarator->kind == cdk_function)
9674 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
9675 if (declarator->kind == cdk_array)
9676 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
9677 returned_attrs = decl_attributes (&type,
9678 chainon (returned_attrs, attrs),
9682 if (declarator->kind == cdk_id)
9685 inner_declarator = declarator->declarator;
9687 switch (declarator->kind)
9690 type = create_array_type_for_decl (dname, type,
9691 declarator->u.array.bounds);
9692 if (declarator->std_attributes)
9695 The optional attribute-specifier-seq appertains to the
9697 returned_attrs = chainon (returned_attrs,
9698 declarator->std_attributes);
9706 /* Declaring a function type.
9707 Make sure we have a valid type for the function to return. */
9709 if (type_quals != TYPE_UNQUALIFIED)
9711 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
9712 warning (OPT_Wignored_qualifiers,
9713 "type qualifiers ignored on function return type");
9714 /* We now know that the TYPE_QUALS don't apply to the
9715 decl, but to its return type. */
9716 type_quals = TYPE_UNQUALIFIED;
9718 errmsg = targetm.invalid_return_type (type);
9722 type = integer_type_node;
9725 /* Error about some types functions can't return. */
9727 if (TREE_CODE (type) == FUNCTION_TYPE)
9729 error ("%qs declared as function returning a function", name);
9730 return error_mark_node;
9732 if (TREE_CODE (type) == ARRAY_TYPE)
9734 error ("%qs declared as function returning an array", name);
9735 return error_mark_node;
9738 input_location = declspecs->locations[ds_type_spec];
9739 abstract_virtuals_error (ACU_RETURN, type);
9740 input_location = saved_loc;
9742 /* Pick up type qualifiers which should be applied to `this'. */
9743 memfn_quals = declarator->u.function.qualifiers;
9744 /* Pick up virt-specifiers. */
9745 virt_specifiers = declarator->u.function.virt_specifiers;
9746 /* And ref-qualifier, too */
9747 rqual = declarator->u.function.ref_qualifier;
9748 /* Pick up the exception specifications. */
9749 raises = declarator->u.function.exception_specification;
9750 /* If the exception-specification is ill-formed, let's pretend
9751 there wasn't one. */
9752 if (raises == error_mark_node)
9755 /* Say it's a definition only for the CALL_EXPR
9756 closest to the identifier. */
9757 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
9759 /* Handle a late-specified return type. */
9762 if (type_uses_auto (type))
9764 if (!declarator->u.function.late_return_type)
9766 if (current_class_type
9767 && LAMBDA_TYPE_P (current_class_type))
9768 /* OK for C++11 lambdas. */;
9769 else if (cxx_dialect < cxx14)
9771 error ("%qs function uses "
9772 "%<auto%> type specifier without trailing "
9773 "return type", name);
9774 inform (input_location, "deduced return type "
9775 "only available with -std=c++14 or "
9780 error ("virtual function cannot "
9781 "have deduced return type");
9785 else if (!is_auto (type))
9787 error ("%qs function with trailing return type has"
9788 " %qT as its type rather than plain %<auto%>",
9790 return error_mark_node;
9793 else if (declarator->u.function.late_return_type)
9795 if (cxx_dialect < cxx11)
9796 /* Not using maybe_warn_cpp0x because this should
9797 always be an error. */
9798 error ("trailing return type only available with "
9799 "-std=c++11 or -std=gnu++11");
9801 error ("%qs function with trailing return type not "
9802 "declared with %<auto%> type specifier", name);
9803 return error_mark_node;
9806 type = splice_late_return_type
9807 (type, declarator->u.function.late_return_type);
9808 if (type == error_mark_node)
9809 return error_mark_node;
9811 if (declarator->u.function.late_return_type)
9812 late_return_type_p = true;
9814 if (ctype == NULL_TREE
9815 && decl_context == FIELD
9818 ctype = current_class_type;
9820 if (ctype && (sfk == sfk_constructor
9821 || sfk == sfk_destructor))
9823 /* We are within a class's scope. If our declarator name
9824 is the same as the class name, and we are defining
9825 a function, then it is a constructor/destructor, and
9826 therefore returns a void type. */
9828 /* ISO C++ 12.4/2. A destructor may not be declared
9829 const or volatile. A destructor may not be static.
9830 A destructor may not be declared with ref-qualifier.
9832 ISO C++ 12.1. A constructor may not be declared
9833 const or volatile. A constructor may not be
9834 virtual. A constructor may not be static.
9835 A constructor may not be declared with ref-qualifier. */
9837 error ((flags == DTOR_FLAG)
9838 ? G_("destructor cannot be static member function")
9839 : G_("constructor cannot be static member function"));
9842 error ((flags == DTOR_FLAG)
9843 ? G_("destructors may not be cv-qualified")
9844 : G_("constructors may not be cv-qualified"));
9845 memfn_quals = TYPE_UNQUALIFIED;
9850 maybe_warn_cpp0x (CPP0X_REF_QUALIFIER);
9851 error ((flags == DTOR_FLAG)
9852 ? "destructors may not be ref-qualified"
9853 : "constructors may not be ref-qualified");
9854 rqual = REF_QUAL_NONE;
9857 if (decl_context == FIELD
9858 && !member_function_or_else (ctype,
9861 return error_mark_node;
9863 if (flags != DTOR_FLAG)
9865 /* It's a constructor. */
9870 permerror (input_location, "constructors cannot be declared virtual");
9873 if (decl_context == FIELD
9874 && sfk != sfk_constructor)
9875 return error_mark_node;
9877 if (decl_context == FIELD)
9884 /* Cannot be both friend and virtual. */
9885 error ("virtual functions cannot be friends");
9888 if (decl_context == NORMAL)
9889 error ("friend declaration not in class definition");
9890 if (current_function_decl && funcdef_flag)
9891 error ("can%'t define friend function %qs in a local "
9895 else if (ctype && sfk == sfk_conversion)
9899 maybe_warn_cpp0x (CPP0X_EXPLICIT_CONVERSION);
9904 arg_types = grokparms (declarator->u.function.parameters,
9907 if (inner_declarator
9908 && inner_declarator->kind == cdk_id
9909 && inner_declarator->u.id.sfk == sfk_destructor
9910 && arg_types != void_list_node)
9912 error ("destructors may not have parameters");
9913 arg_types = void_list_node;
9917 type = build_function_type (type, arg_types);
9918 if (declarator->std_attributes)
9921 The optional attribute-specifier-seq appertains to
9922 the function type. */
9923 decl_attributes (&type, declarator->std_attributes,
9931 /* Filter out pointers-to-references and references-to-references.
9932 We can get these if a TYPE_DECL is used. */
9934 if (TREE_CODE (type) == REFERENCE_TYPE)
9936 if (declarator->kind != cdk_reference)
9938 error ("cannot declare pointer to %q#T", type);
9939 type = TREE_TYPE (type);
9942 /* In C++0x, we allow reference to reference declarations
9943 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
9944 and template type arguments [14.3.1/4 temp.arg.type]. The
9945 check for direct reference to reference declarations, which
9946 are still forbidden, occurs below. Reasoning behind the change
9947 can be found in DR106, DR540, and the rvalue reference
9949 else if (cxx_dialect == cxx98)
9951 error ("cannot declare reference to %q#T", type);
9952 type = TREE_TYPE (type);
9955 else if (VOID_TYPE_P (type))
9957 if (declarator->kind == cdk_reference)
9958 error ("cannot declare reference to %q#T", type);
9959 else if (declarator->kind == cdk_ptrmem)
9960 error ("cannot declare pointer to %q#T member", type);
9963 /* We now know that the TYPE_QUALS don't apply to the decl,
9964 but to the target of the pointer. */
9965 type_quals = TYPE_UNQUALIFIED;
9967 /* This code used to handle METHOD_TYPE, but I don't think it's
9968 possible to get it here anymore. */
9969 gcc_assert (TREE_CODE (type) != METHOD_TYPE);
9970 if (declarator->kind == cdk_ptrmem
9971 && TREE_CODE (type) == FUNCTION_TYPE)
9973 memfn_quals |= type_memfn_quals (type);
9974 type = build_memfn_type (type,
9975 declarator->u.pointer.class_type,
9978 if (type == error_mark_node)
9979 return error_mark_node;
9981 rqual = REF_QUAL_NONE;
9982 memfn_quals = TYPE_UNQUALIFIED;
9985 if (TREE_CODE (type) == FUNCTION_TYPE
9986 && (type_memfn_quals (type) != TYPE_UNQUALIFIED
9987 || type_memfn_rqual (type) != REF_QUAL_NONE))
9988 error (declarator->kind == cdk_reference
9989 ? G_("cannot declare reference to qualified function type %qT")
9990 : G_("cannot declare pointer to qualified function type %qT"),
9993 /* When the pointed-to type involves components of variable size,
9994 care must be taken to ensure that the size evaluation code is
9995 emitted early enough to dominate all the possible later uses
9996 and late enough for the variables on which it depends to have
9999 This is expected to happen automatically when the pointed-to
10000 type has a name/declaration of it's own, but special attention
10001 is required if the type is anonymous.
10003 We handle the NORMAL and FIELD contexts here by inserting a
10004 dummy statement that just evaluates the size at a safe point
10005 and ensures it is not deferred until e.g. within a deeper
10006 conditional context (c++/43555).
10008 We expect nothing to be needed here for PARM or TYPENAME.
10009 Evaluating the size at this point for TYPENAME would
10010 actually be incorrect, as we might be in the middle of an
10011 expression with side effects on the pointed-to type size
10012 "arguments" prior to the pointer declaration point and the
10013 size evaluation could end up prior to the side effects. */
10015 if (!TYPE_NAME (type)
10016 && (decl_context == NORMAL || decl_context == FIELD)
10017 && at_function_scope_p ()
10018 && variably_modified_type_p (type, NULL_TREE))
10019 /* Force evaluation of the SAVE_EXPR. */
10020 finish_expr_stmt (TYPE_SIZE (type));
10022 if (declarator->kind == cdk_reference)
10024 /* In C++0x, the type we are creating a reference to might be
10025 a typedef which is itself a reference type. In that case,
10026 we follow the reference collapsing rules in
10027 [7.1.3/8 dcl.typedef] to create the final reference type:
10029 "If a typedef TD names a type that is a reference to a type
10030 T, an attempt to create the type 'lvalue reference to cv TD'
10031 creates the type 'lvalue reference to T,' while an attempt
10032 to create the type "rvalue reference to cv TD' creates the
10035 if (VOID_TYPE_P (type))
10036 /* We already gave an error. */;
10037 else if (TREE_CODE (type) == REFERENCE_TYPE)
10039 if (declarator->u.reference.rvalue_ref)
10040 /* Leave type alone. */;
10042 type = cp_build_reference_type (TREE_TYPE (type), false);
10045 type = cp_build_reference_type
10046 (type, declarator->u.reference.rvalue_ref);
10048 /* In C++0x, we need this check for direct reference to
10049 reference declarations, which are forbidden by
10050 [8.3.2/5 dcl.ref]. Reference to reference declarations
10051 are only allowed indirectly through typedefs and template
10052 type arguments. Example:
10054 void foo(int & &); // invalid ref-to-ref decl
10056 typedef int & int_ref;
10057 void foo(int_ref &); // valid ref-to-ref decl
10059 if (inner_declarator && inner_declarator->kind == cdk_reference)
10060 error ("cannot declare reference to %q#T, which is not "
10061 "a typedef or a template type argument", type);
10063 else if (TREE_CODE (type) == METHOD_TYPE)
10064 type = build_ptrmemfunc_type (build_pointer_type (type));
10065 else if (declarator->kind == cdk_ptrmem)
10067 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
10068 != NAMESPACE_DECL);
10069 if (declarator->u.pointer.class_type == error_mark_node)
10070 /* We will already have complained. */
10071 type = error_mark_node;
10073 type = build_ptrmem_type (declarator->u.pointer.class_type,
10077 type = build_pointer_type (type);
10079 /* Process a list of type modifier keywords (such as
10080 const or volatile) that were given inside the `*' or `&'. */
10082 if (declarator->u.pointer.qualifiers)
10085 = cp_build_qualified_type (type,
10086 declarator->u.pointer.qualifiers);
10087 type_quals = cp_type_quals (type);
10090 /* Apply C++11 attributes to the pointer, and not to the
10091 type pointed to. This is unlike what is done for GNU
10092 attributes above. It is to comply with [dcl.ptr]/1:
10094 [the optional attribute-specifier-seq (7.6.1) appertains
10095 to the pointer and not to the object pointed to]. */
10096 if (declarator->std_attributes)
10097 decl_attributes (&type, declarator->std_attributes,
10107 gcc_unreachable ();
10111 /* A `constexpr' specifier used in an object declaration declares
10112 the object as `const'. */
10113 if (constexpr_p && innermost_code != cdk_function)
10115 if (type_quals & TYPE_QUAL_VOLATILE)
10116 error ("both %<volatile%> and %<constexpr%> cannot be used here");
10117 if (TREE_CODE (type) != REFERENCE_TYPE)
10119 type_quals |= TYPE_QUAL_CONST;
10120 type = cp_build_qualified_type (type, type_quals);
10124 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
10125 && TREE_CODE (type) != FUNCTION_TYPE
10126 && TREE_CODE (type) != METHOD_TYPE
10127 && !variable_template_p (TREE_OPERAND (unqualified_id, 0)))
10129 error ("template-id %qD used as a declarator",
10131 unqualified_id = dname;
10134 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
10135 qualified with a class-name, turn it into a METHOD_TYPE, unless
10136 we know that the function is static. We take advantage of this
10137 opportunity to do other processing that pertains to entities
10138 explicitly declared to be class members. Note that if DECLARATOR
10139 is non-NULL, we know it is a cdk_id declarator; otherwise, we
10140 would not have exited the loop above. */
10142 && declarator->u.id.qualifying_scope
10143 && MAYBE_CLASS_TYPE_P (declarator->u.id.qualifying_scope))
10145 ctype = declarator->u.id.qualifying_scope;
10146 ctype = TYPE_MAIN_VARIANT (ctype);
10147 template_count = num_template_headers_for_class (ctype);
10149 if (ctype == current_class_type)
10153 permerror (input_location, "member functions are implicitly friends of their class");
10157 permerror (declarator->id_loc,
10158 "extra qualification %<%T::%> on member %qs",
10161 else if (/* If the qualifying type is already complete, then we
10162 can skip the following checks. */
10163 !COMPLETE_TYPE_P (ctype)
10164 && (/* If the function is being defined, then
10165 qualifying type must certainly be complete. */
10167 /* A friend declaration of "T::f" is OK, even if
10168 "T" is a template parameter. But, if this
10169 function is not a friend, the qualifying type
10170 must be a class. */
10171 || (!friendp && !CLASS_TYPE_P (ctype))
10172 /* For a declaration, the type need not be
10173 complete, if either it is dependent (since there
10174 is no meaningful definition of complete in that
10175 case) or the qualifying class is currently being
10177 || !(dependent_type_p (ctype)
10178 || currently_open_class (ctype)))
10179 /* Check that the qualifying type is complete. */
10180 && !complete_type_or_else (ctype, NULL_TREE))
10181 return error_mark_node;
10182 else if (TREE_CODE (type) == FUNCTION_TYPE)
10184 if (current_class_type
10185 && (!friendp || funcdef_flag))
10187 error (funcdef_flag
10188 ? G_("cannot define member function %<%T::%s%> "
10190 : G_("cannot declare member function %<%T::%s%> "
10192 ctype, name, current_class_type);
10193 return error_mark_node;
10196 else if (typedef_p && current_class_type)
10198 error ("cannot declare member %<%T::%s%> within %qT",
10199 ctype, name, current_class_type);
10200 return error_mark_node;
10204 if (ctype == NULL_TREE && decl_context == FIELD && friendp == 0)
10205 ctype = current_class_type;
10207 /* Now TYPE has the actual type. */
10209 if (returned_attrs)
10212 *attrlist = chainon (returned_attrs, *attrlist);
10214 attrlist = &returned_attrs;
10218 && declarator->kind == cdk_id
10219 && declarator->std_attributes)
10220 /* [dcl.meaning]/1: The optional attribute-specifier-seq following
10221 a declarator-id appertains to the entity that is declared. */
10222 *attrlist = chainon (*attrlist, declarator->std_attributes);
10224 /* Handle parameter packs. */
10225 if (parameter_pack_p)
10227 if (decl_context == PARM)
10228 /* Turn the type into a pack expansion.*/
10229 type = make_pack_expansion (type);
10231 error ("non-parameter %qs cannot be a parameter pack", name);
10234 /* Did array size calculations overflow or does the array cover more
10235 than half of the address-space? */
10236 if (TREE_CODE (type) == ARRAY_TYPE
10237 && COMPLETE_TYPE_P (type)
10238 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
10239 && ! valid_constant_size_p (TYPE_SIZE_UNIT (type)))
10241 error ("size of array %qs is too large", name);
10242 /* If we proceed with the array type as it is, we'll eventually
10243 crash in tree_to_[su]hwi(). */
10244 type = error_mark_node;
10247 if ((decl_context == FIELD || decl_context == PARM)
10248 && !processing_template_decl
10249 && variably_modified_type_p (type, NULL_TREE))
10251 if (decl_context == FIELD)
10252 error ("data member may not have variably modified type %qT", type);
10254 error ("parameter may not have variably modified type %qT", type);
10255 type = error_mark_node;
10258 if (explicitp == 1 || (explicitp && friendp))
10260 /* [dcl.fct.spec] (C++11) The explicit specifier shall be used only
10261 in the declaration of a constructor or conversion function within
10262 a class definition. */
10263 if (!current_class_type)
10264 error ("%<explicit%> outside class declaration");
10266 error ("%<explicit%> in friend declaration");
10268 error ("only declarations of constructors and conversion operators "
10269 "can be %<explicit%>");
10273 if (storage_class == sc_mutable)
10275 if (decl_context != FIELD || friendp)
10277 error ("non-member %qs cannot be declared %<mutable%>", name);
10278 storage_class = sc_none;
10280 else if (decl_context == TYPENAME || typedef_p)
10282 error ("non-object member %qs cannot be declared %<mutable%>", name);
10283 storage_class = sc_none;
10285 else if (TREE_CODE (type) == FUNCTION_TYPE
10286 || TREE_CODE (type) == METHOD_TYPE)
10288 error ("function %qs cannot be declared %<mutable%>", name);
10289 storage_class = sc_none;
10293 error ("static %qs cannot be declared %<mutable%>", name);
10294 storage_class = sc_none;
10296 else if (type_quals & TYPE_QUAL_CONST)
10298 error ("const %qs cannot be declared %<mutable%>", name);
10299 storage_class = sc_none;
10301 else if (TREE_CODE (type) == REFERENCE_TYPE)
10303 permerror (input_location, "reference %qs cannot be declared "
10304 "%<mutable%>", name);
10305 storage_class = sc_none;
10309 /* If this is declaring a typedef name, return a TYPE_DECL. */
10310 if (typedef_p && decl_context != TYPENAME)
10314 /* Note that the grammar rejects storage classes
10315 in typenames, fields or parameters. */
10316 if (current_lang_name == lang_name_java)
10317 TYPE_FOR_JAVA (type) = 1;
10319 /* This declaration:
10321 typedef void f(int) const;
10323 declares a function type which is not a member of any
10324 particular class, but which is cv-qualified; for
10325 example "f S::*" declares a pointer to a const-qualified
10326 member function of S. We record the cv-qualification in the
10328 if ((rqual || memfn_quals) && TREE_CODE (type) == FUNCTION_TYPE)
10330 type = apply_memfn_quals (type, memfn_quals, rqual);
10332 /* We have now dealt with these qualifiers. */
10333 memfn_quals = TYPE_UNQUALIFIED;
10334 rqual = REF_QUAL_NONE;
10337 if (type_uses_auto (type))
10339 error ("typedef declared %<auto%>");
10340 type = error_mark_node;
10343 if (decl_context == FIELD)
10344 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
10346 decl = build_decl (input_location, TYPE_DECL, unqualified_id, type);
10347 if (id_declarator && declarator->u.id.qualifying_scope) {
10348 error_at (DECL_SOURCE_LOCATION (decl),
10349 "typedef name may not be a nested-name-specifier");
10350 TREE_TYPE (decl) = error_mark_node;
10353 if (decl_context != FIELD)
10355 if (!current_function_decl)
10356 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
10357 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
10358 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
10359 (current_function_decl)))
10360 /* The TYPE_DECL is "abstract" because there will be
10361 clones of this constructor/destructor, and there will
10362 be copies of this TYPE_DECL generated in those
10363 clones. The decloning optimization (for space) may
10364 revert this subsequently if it determines that
10365 the clones should share a common implementation. */
10366 DECL_ABSTRACT_P (decl) = true;
10368 else if (current_class_type
10369 && constructor_name_p (unqualified_id, current_class_type))
10370 permerror (input_location, "ISO C++ forbids nested type %qD with same name "
10371 "as enclosing class",
10374 /* If the user declares "typedef struct {...} foo" then the
10375 struct will have an anonymous name. Fill that name in now.
10376 Nothing can refer to it, so nothing needs know about the name
10378 if (type != error_mark_node
10380 && TYPE_NAME (type)
10381 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
10382 && TYPE_ANONYMOUS_P (type)
10383 && declspecs->type_definition_p
10384 && attributes_naming_typedef_ok (*attrlist)
10385 && cp_type_quals (type) == TYPE_UNQUALIFIED)
10389 /* Replace the anonymous name with the real name everywhere. */
10390 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
10392 if (ANON_AGGRNAME_P (TYPE_IDENTIFIER (t)))
10393 /* We do not rename the debug info representing the
10394 anonymous tagged type because the standard says in
10395 [dcl.typedef] that the naming applies only for
10396 linkage purposes. */
10397 /*debug_hooks->set_name (t, decl);*/
10398 TYPE_NAME (t) = decl;
10401 if (TYPE_LANG_SPECIFIC (type))
10402 TYPE_WAS_ANONYMOUS (type) = 1;
10404 /* If this is a typedef within a template class, the nested
10405 type is a (non-primary) template. The name for the
10406 template needs updating as well. */
10407 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
10408 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
10409 = TYPE_IDENTIFIER (type);
10411 /* Adjust linkage now that we aren't anonymous anymore. */
10412 reset_type_linkage (type);
10414 /* FIXME remangle member functions; member functions of a
10415 type with external linkage have external linkage. */
10419 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
10420 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
10422 bad_specifiers (decl, BSP_TYPE, virtualp,
10423 memfn_quals != TYPE_UNQUALIFIED,
10424 inlinep, friendp, raises != NULL_TREE);
10426 if (decl_spec_seq_has_spec_p (declspecs, ds_alias))
10427 /* Acknowledge that this was written:
10428 `using analias = atype;'. */
10429 TYPE_DECL_ALIAS_P (decl) = 1;
10434 /* Detect the case of an array type of unspecified size
10435 which came, as such, direct from a typedef name.
10436 We must copy the type, so that the array's domain can be
10437 individually set by the object's initializer. */
10439 if (type && typedef_type
10440 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
10441 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
10442 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
10444 /* Detect where we're using a typedef of function type to declare a
10445 function. PARMS will not be set, so we must create it now. */
10447 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
10449 tree decls = NULL_TREE;
10452 for (args = TYPE_ARG_TYPES (type);
10453 args && args != void_list_node;
10454 args = TREE_CHAIN (args))
10456 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
10458 DECL_CHAIN (decl) = decls;
10462 parms = nreverse (decls);
10464 if (decl_context != TYPENAME)
10466 /* The qualifiers on the function type become the qualifiers on
10467 the non-static member function. */
10468 memfn_quals |= type_memfn_quals (type);
10469 rqual = type_memfn_rqual (type);
10470 type_quals = TYPE_UNQUALIFIED;
10474 /* If this is a type name (such as, in a cast or sizeof),
10475 compute the type and return it now. */
10477 if (decl_context == TYPENAME)
10479 /* Note that the grammar rejects storage classes
10480 in typenames, fields or parameters. */
10481 if (type_quals != TYPE_UNQUALIFIED)
10482 type_quals = TYPE_UNQUALIFIED;
10484 /* Special case: "friend class foo" looks like a TYPENAME context. */
10487 if (type_quals != TYPE_UNQUALIFIED)
10489 error ("type qualifiers specified for friend class declaration");
10490 type_quals = TYPE_UNQUALIFIED;
10494 error ("%<inline%> specified for friend class declaration");
10500 /* Don't allow friend declaration without a class-key. */
10501 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
10502 permerror (input_location, "template parameters cannot be friends");
10503 else if (TREE_CODE (type) == TYPENAME_TYPE)
10504 permerror (input_location, "friend declaration requires class-key, "
10505 "i.e. %<friend class %T::%D%>",
10506 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
10508 permerror (input_location, "friend declaration requires class-key, "
10509 "i.e. %<friend %#T%>",
10513 /* Only try to do this stuff if we didn't already give up. */
10514 if (type != integer_type_node)
10516 /* A friendly class? */
10517 if (current_class_type)
10518 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
10519 /*complain=*/true);
10521 error ("trying to make class %qT a friend of global scope",
10524 type = void_type_node;
10527 else if (memfn_quals || rqual)
10529 if (ctype == NULL_TREE
10530 && TREE_CODE (type) == METHOD_TYPE)
10531 ctype = TYPE_METHOD_BASETYPE (type);
10534 type = build_memfn_type (type, ctype, memfn_quals, rqual);
10535 /* Core issue #547: need to allow this in template type args.
10536 Allow it in general in C++11 for alias-declarations. */
10537 else if ((template_type_arg || cxx_dialect >= cxx11)
10538 && TREE_CODE (type) == FUNCTION_TYPE)
10539 type = apply_memfn_quals (type, memfn_quals, rqual);
10541 error ("invalid qualifiers on non-member function type");
10546 else if (unqualified_id == NULL_TREE && decl_context != PARM
10547 && decl_context != CATCHPARM
10548 && TREE_CODE (type) != UNION_TYPE
10551 error ("abstract declarator %qT used as declaration", type);
10552 return error_mark_node;
10555 /* Only functions may be declared using an operator-function-id. */
10557 && IDENTIFIER_OPNAME_P (unqualified_id)
10558 && TREE_CODE (type) != FUNCTION_TYPE
10559 && TREE_CODE (type) != METHOD_TYPE)
10561 error ("declaration of %qD as non-function", unqualified_id);
10562 return error_mark_node;
10565 /* We don't check parameter types here because we can emit a better
10566 error message later. */
10567 if (decl_context != PARM)
10569 type = check_var_type (unqualified_id, type);
10570 if (type == error_mark_node)
10571 return error_mark_node;
10574 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
10575 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
10577 if (decl_context == PARM || decl_context == CATCHPARM)
10579 if (ctype || in_namespace)
10580 error ("cannot use %<::%> in parameter declaration");
10582 if (type_uses_auto (type))
10584 if (cxx_dialect >= cxx14)
10585 error ("%<auto%> parameter not permitted in this context");
10587 error ("parameter declared %<auto%>");
10588 type = error_mark_node;
10591 /* A parameter declared as an array of T is really a pointer to T.
10592 One declared as a function is really a pointer to a function.
10593 One declared as a member is really a pointer to member. */
10595 if (TREE_CODE (type) == ARRAY_TYPE)
10597 /* Transfer const-ness of array into that of type pointed to. */
10598 type = build_pointer_type (TREE_TYPE (type));
10599 type_quals = TYPE_UNQUALIFIED;
10600 array_parameter_p = true;
10602 else if (TREE_CODE (type) == FUNCTION_TYPE)
10603 type = build_pointer_type (type);
10606 if (ctype && TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
10607 && !NEW_DELETE_OPNAME_P (unqualified_id))
10609 cp_cv_quals real_quals = memfn_quals;
10610 if (cxx_dialect < cxx14 && constexpr_p
10611 && sfk != sfk_constructor && sfk != sfk_destructor)
10612 real_quals |= TYPE_QUAL_CONST;
10613 type = build_memfn_type (type, ctype, real_quals, rqual);
10619 if (decl_context == PARM)
10621 decl = cp_build_parm_decl (unqualified_id, type);
10622 DECL_ARRAY_PARAMETER_P (decl) = array_parameter_p;
10624 bad_specifiers (decl, BSP_PARM, virtualp,
10625 memfn_quals != TYPE_UNQUALIFIED,
10626 inlinep, friendp, raises != NULL_TREE);
10628 else if (decl_context == FIELD)
10630 if (!staticp && TREE_CODE (type) != METHOD_TYPE
10631 && type_uses_auto (type))
10633 error ("non-static data member declared %<auto%>");
10634 type = error_mark_node;
10637 /* The C99 flexible array extension. */
10638 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
10639 && TYPE_DOMAIN (type) == NULL_TREE)
10641 tree itype = compute_array_index_type (dname, integer_zero_node,
10642 tf_warning_or_error);
10643 type = build_cplus_array_type (TREE_TYPE (type), itype);
10646 if (type == error_mark_node)
10648 /* Happens when declaring arrays of sizes which
10649 are error_mark_node, for example. */
10652 else if (in_namespace && !friendp)
10654 /* Something like struct S { int N::j; }; */
10655 error ("invalid use of %<::%>");
10656 return error_mark_node;
10658 else if (TREE_CODE (type) == FUNCTION_TYPE
10659 || TREE_CODE (type) == METHOD_TYPE)
10662 tree function_context;
10666 /* This should never happen in pure C++ (the check
10667 could be an assert). It could happen in
10668 Objective-C++ if someone writes invalid code that
10669 uses a function declaration for an instance
10670 variable or property (instance variables and
10671 properties are parsed as FIELD_DECLs, but they are
10672 part of an Objective-C class, not a C++ class).
10673 That code is invalid and is caught by this
10677 error ("declaration of function %qD in invalid context",
10679 return error_mark_node;
10682 /* ``A union may [ ... ] not [ have ] virtual functions.''
10684 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
10686 error ("function %qD declared virtual inside a union",
10688 return error_mark_node;
10691 if (NEW_DELETE_OPNAME_P (unqualified_id))
10695 error ("%qD cannot be declared virtual, since it "
10696 "is always static",
10703 /* Check that the name used for a destructor makes sense. */
10704 if (sfk == sfk_destructor)
10706 tree uqname = id_declarator->u.id.unqualified_name;
10710 gcc_assert (friendp);
10711 error ("expected qualified name in friend declaration "
10712 "for destructor %qD", uqname);
10713 return error_mark_node;
10716 if (!check_dtor_name (ctype, TREE_OPERAND (uqname, 0)))
10718 error ("declaration of %qD as member of %qT",
10720 return error_mark_node;
10724 error ("a destructor cannot be %<constexpr%>");
10725 return error_mark_node;
10728 else if (sfk == sfk_constructor && friendp && !ctype)
10730 error ("expected qualified name in friend declaration "
10731 "for constructor %qD",
10732 id_declarator->u.id.unqualified_name);
10733 return error_mark_node;
10736 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
10738 tree tmpl = TREE_OPERAND (unqualified_id, 0);
10739 if (variable_template_p (tmpl))
10741 error ("specialization of variable template %qD "
10742 "declared as function", tmpl);
10743 inform (DECL_SOURCE_LOCATION (tmpl),
10744 "variable template declared here");
10745 return error_mark_node;
10749 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
10750 function_context = (ctype != NULL_TREE) ?
10751 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
10752 publicp = (! friendp || ! staticp)
10753 && function_context == NULL_TREE;
10755 if (late_return_type_p)
10756 TYPE_HAS_LATE_RETURN_TYPE (type) = 1;
10758 decl = grokfndecl (ctype, type,
10759 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
10760 ? unqualified_id : dname,
10763 virtualp, flags, memfn_quals, rqual, raises,
10764 friendp ? -1 : 0, friendp, publicp,
10765 inlinep | (2 * constexpr_p),
10766 initialized == SD_DELETED, sfk,
10767 funcdef_flag, template_count, in_namespace,
10768 attrlist, declarator->id_loc);
10769 decl = set_virt_specifiers (decl, virt_specifiers);
10770 if (decl == NULL_TREE)
10771 return error_mark_node;
10773 /* This clobbers the attrs stored in `decl' from `attrlist'. */
10774 /* The decl and setting of decl_attr is also turned off. */
10775 decl = build_decl_attribute_variant (decl, decl_attr);
10778 /* [class.conv.ctor]
10780 A constructor declared without the function-specifier
10781 explicit that can be called with a single parameter
10782 specifies a conversion from the type of its first
10783 parameter to the type of its class. Such a constructor
10784 is called a converting constructor. */
10785 if (explicitp == 2)
10786 DECL_NONCONVERTING_P (decl) = 1;
10788 else if (!staticp && !dependent_type_p (type)
10789 && !COMPLETE_TYPE_P (complete_type (type))
10790 && (TREE_CODE (type) != ARRAY_TYPE
10791 || !COMPLETE_TYPE_P (TREE_TYPE (type))
10792 || initialized == 0))
10794 if (unqualified_id)
10796 error ("field %qD has incomplete type %qT",
10797 unqualified_id, type);
10798 cxx_incomplete_type_inform (strip_array_types (type));
10801 error ("name %qT has incomplete type", type);
10803 type = error_mark_node;
10810 error ("%qE is neither function nor member function; "
10811 "cannot be declared friend", unqualified_id);
10819 /* Friends are treated specially. */
10820 if (ctype == current_class_type)
10821 ; /* We already issued a permerror. */
10822 else if (decl && DECL_NAME (decl))
10824 if (template_class_depth (current_class_type) == 0)
10826 decl = check_explicit_specialization
10827 (unqualified_id, decl, template_count,
10828 2 * funcdef_flag + 4);
10829 if (decl == error_mark_node)
10830 return error_mark_node;
10833 decl = do_friend (ctype, unqualified_id, decl,
10839 return error_mark_node;
10842 /* Structure field. It may not be a function, except for C++. */
10844 if (decl == NULL_TREE)
10848 /* C++ allows static class members. All other work
10849 for this is done by grokfield. */
10850 decl = build_lang_decl_loc (declarator
10851 ? declarator->id_loc
10853 VAR_DECL, unqualified_id, type);
10854 set_linkage_for_static_data_member (decl);
10855 /* Even if there is an in-class initialization, DECL
10856 is considered undefined until an out-of-class
10857 definition is provided. */
10858 DECL_EXTERNAL (decl) = 1;
10862 set_decl_tls_model (decl, decl_default_tls_model (decl));
10863 if (declspecs->gnu_thread_keyword_p)
10864 DECL_GNU_TLS_P (decl) = true;
10867 if (constexpr_p && !initialized)
10869 error ("constexpr static data member %qD must have an "
10870 "initializer", decl);
10871 constexpr_p = false;
10878 error ("non-static data member %qE declared %<constexpr%>",
10880 constexpr_p = false;
10882 decl = build_decl (input_location,
10883 FIELD_DECL, unqualified_id, type);
10884 DECL_NONADDRESSABLE_P (decl) = bitfield;
10885 if (bitfield && !unqualified_id)
10886 TREE_NO_WARNING (decl) = 1;
10888 if (storage_class == sc_mutable)
10890 DECL_MUTABLE_P (decl) = 1;
10891 storage_class = sc_none;
10896 /* An attempt is being made to initialize a non-static
10897 member. This is new in C++11. */
10898 maybe_warn_cpp0x (CPP0X_NSDMI);
10900 /* If this has been parsed with static storage class, but
10901 errors forced staticp to be cleared, ensure NSDMI is
10903 if (declspecs->storage_class == sc_static)
10904 DECL_INITIAL (decl) = error_mark_node;
10908 bad_specifiers (decl, BSP_FIELD, virtualp,
10909 memfn_quals != TYPE_UNQUALIFIED,
10910 inlinep, friendp, raises != NULL_TREE);
10913 else if (TREE_CODE (type) == FUNCTION_TYPE
10914 || TREE_CODE (type) == METHOD_TYPE)
10916 tree original_name;
10919 if (!unqualified_id)
10920 return error_mark_node;
10922 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
10923 original_name = dname;
10925 original_name = unqualified_id;
10927 if (storage_class == sc_auto)
10928 error ("storage class %<auto%> invalid for function %qs", name);
10929 else if (storage_class == sc_register)
10930 error ("storage class %<register%> invalid for function %qs", name);
10933 if (declspecs->gnu_thread_keyword_p)
10934 error ("storage class %<__thread%> invalid for function %qs",
10937 error ("storage class %<thread_local%> invalid for function %qs",
10941 if (virt_specifiers)
10942 error ("virt-specifiers in %qs not allowed outside a class definition", name);
10943 /* Function declaration not at top level.
10944 Storage classes other than `extern' are not allowed
10945 and `extern' makes no difference. */
10946 if (! toplevel_bindings_p ()
10947 && (storage_class == sc_static
10948 || decl_spec_seq_has_spec_p (declspecs, ds_inline))
10951 if (storage_class == sc_static)
10952 pedwarn (input_location, OPT_Wpedantic,
10953 "%<static%> specified invalid for function %qs "
10954 "declared out of global scope", name);
10956 pedwarn (input_location, OPT_Wpedantic,
10957 "%<inline%> specifier invalid for function %qs "
10958 "declared out of global scope", name);
10961 if (ctype == NULL_TREE)
10965 error ("virtual non-class function %qs", name);
10968 else if (sfk == sfk_constructor
10969 || sfk == sfk_destructor)
10971 error (funcdef_flag
10972 ? G_("%qs defined in a non-class scope")
10973 : G_("%qs declared in a non-class scope"), name);
10978 /* Record whether the function is public. */
10979 publicp = (ctype != NULL_TREE
10980 || storage_class != sc_static);
10982 if (late_return_type_p)
10983 TYPE_HAS_LATE_RETURN_TYPE (type) = 1;
10985 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
10986 virtualp, flags, memfn_quals, rqual, raises,
10988 publicp, inlinep | (2 * constexpr_p),
10989 initialized == SD_DELETED, sfk,
10991 template_count, in_namespace, attrlist,
10992 declarator->id_loc);
10993 if (decl == NULL_TREE)
10994 return error_mark_node;
10998 int invalid_static = 0;
11000 /* Don't allow a static member function in a class, and forbid
11001 declaring main to be static. */
11002 if (TREE_CODE (type) == METHOD_TYPE)
11004 permerror (input_location, "cannot declare member function %qD to have "
11005 "static linkage", decl);
11006 invalid_static = 1;
11008 else if (current_function_decl)
11010 /* FIXME need arm citation */
11011 error ("cannot declare static function inside another function");
11012 invalid_static = 1;
11015 if (invalid_static)
11018 storage_class = sc_none;
11024 /* It's a variable. */
11026 /* An uninitialized decl with `extern' is a reference. */
11027 decl = grokvardecl (type, dname, unqualified_id,
11030 (type_quals & TYPE_QUAL_CONST) != 0,
11032 ctype ? ctype : in_namespace);
11033 if (decl == NULL_TREE)
11034 return error_mark_node;
11036 bad_specifiers (decl, BSP_VAR, virtualp,
11037 memfn_quals != TYPE_UNQUALIFIED,
11038 inlinep, friendp, raises != NULL_TREE);
11042 DECL_CONTEXT (decl) = ctype;
11045 permerror (input_location, "%<static%> may not be used when defining "
11046 "(as opposed to declaring) a static data member");
11048 storage_class = sc_none;
11050 if (storage_class == sc_register && TREE_STATIC (decl))
11052 error ("static member %qD declared %<register%>", decl);
11053 storage_class = sc_none;
11055 if (storage_class == sc_extern && pedantic)
11057 pedwarn (input_location, OPT_Wpedantic,
11058 "cannot explicitly declare member %q#D to have "
11059 "extern linkage", decl);
11060 storage_class = sc_none;
11063 else if (constexpr_p && DECL_EXTERNAL (decl))
11065 error ("declaration of constexpr variable %qD is not a definition",
11067 constexpr_p = false;
11071 if (storage_class == sc_extern && initialized && !funcdef_flag)
11073 if (toplevel_bindings_p ())
11075 /* It's common practice (and completely valid) to have a const
11076 be initialized and declared extern. */
11077 if (!(type_quals & TYPE_QUAL_CONST))
11078 warning (0, "%qs initialized and declared %<extern%>", name);
11082 error ("%qs has both %<extern%> and initializer", name);
11083 return error_mark_node;
11087 /* Record `register' declaration for warnings on &
11088 and in case doing stupid register allocation. */
11090 if (storage_class == sc_register)
11091 DECL_REGISTER (decl) = 1;
11092 else if (storage_class == sc_extern)
11093 DECL_THIS_EXTERN (decl) = 1;
11094 else if (storage_class == sc_static)
11095 DECL_THIS_STATIC (decl) = 1;
11097 /* Set constexpr flag on vars (functions got it in grokfndecl). */
11098 if (constexpr_p && VAR_P (decl))
11099 DECL_DECLARED_CONSTEXPR_P (decl) = true;
11101 /* Record constancy and volatility on the DECL itself . There's
11102 no need to do this when processing a template; we'll do this
11103 for the instantiated declaration based on the type of DECL. */
11104 if (!processing_template_decl)
11105 cp_apply_type_quals_to_decl (type_quals, decl);
11111 /* Subroutine of start_function. Ensure that each of the parameter
11112 types (as listed in PARMS) is complete, as is required for a
11113 function definition. */
11116 require_complete_types_for_parms (tree parms)
11118 for (; parms; parms = DECL_CHAIN (parms))
11120 if (dependent_type_p (TREE_TYPE (parms)))
11122 if (!VOID_TYPE_P (TREE_TYPE (parms))
11123 && complete_type_or_else (TREE_TYPE (parms), parms))
11125 relayout_decl (parms);
11126 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
11129 /* grokparms or complete_type_or_else will have already issued
11131 TREE_TYPE (parms) = error_mark_node;
11135 /* Returns nonzero if T is a local variable. */
11138 local_variable_p (const_tree t)
11141 /* A VAR_DECL with a context that is a _TYPE is a static data
11143 && !TYPE_P (CP_DECL_CONTEXT (t))
11144 /* Any other non-local variable must be at namespace scope. */
11145 && !DECL_NAMESPACE_SCOPE_P (t))
11146 || (TREE_CODE (t) == PARM_DECL))
11152 /* Like local_variable_p, but suitable for use as a tree-walking
11156 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
11159 if (local_variable_p (*tp)
11160 && (!DECL_ARTIFICIAL (*tp) || DECL_NAME (*tp) == this_identifier))
11162 else if (TYPE_P (*tp))
11163 *walk_subtrees = 0;
11168 /* Check that ARG, which is a default-argument expression for a
11169 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
11170 something goes wrong. DECL may also be a _TYPE node, rather than a
11171 DECL, if there is no DECL available. */
11174 check_default_argument (tree decl, tree arg, tsubst_flags_t complain)
11179 if (TREE_CODE (arg) == DEFAULT_ARG)
11180 /* We get a DEFAULT_ARG when looking at an in-class declaration
11181 with a default argument. Ignore the argument for now; we'll
11182 deal with it after the class is complete. */
11191 decl_type = TREE_TYPE (decl);
11193 if (arg == error_mark_node
11194 || decl == error_mark_node
11195 || TREE_TYPE (arg) == error_mark_node
11196 || decl_type == error_mark_node)
11197 /* Something already went wrong. There's no need to check
11199 return error_mark_node;
11201 /* [dcl.fct.default]
11203 A default argument expression is implicitly converted to the
11205 ++cp_unevaluated_operand;
11206 perform_implicit_conversion_flags (decl_type, arg, complain,
11208 --cp_unevaluated_operand;
11210 if (warn_zero_as_null_pointer_constant
11211 && TYPE_PTR_OR_PTRMEM_P (decl_type)
11212 && null_ptr_cst_p (arg)
11213 && (complain & tf_warning)
11214 && maybe_warn_zero_as_null_pointer_constant (arg, input_location))
11215 return nullptr_node;
11217 /* [dcl.fct.default]
11219 Local variables shall not be used in default argument
11222 The keyword `this' shall not be used in a default argument of a
11223 member function. */
11224 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
11227 if (complain & tf_warning_or_error)
11229 if (DECL_NAME (var) == this_identifier)
11230 permerror (input_location, "default argument %qE uses %qD",
11233 error ("default argument %qE uses local variable %qD", arg, var);
11235 return error_mark_node;
11242 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
11245 type_is_deprecated (tree type)
11247 enum tree_code code;
11248 if (TREE_DEPRECATED (type))
11250 if (TYPE_NAME (type)
11251 && TREE_DEPRECATED (TYPE_NAME (type)))
11254 /* Do warn about using typedefs to a deprecated class. */
11255 if (OVERLOAD_TYPE_P (type) && type != TYPE_MAIN_VARIANT (type))
11256 return type_is_deprecated (TYPE_MAIN_VARIANT (type));
11258 code = TREE_CODE (type);
11260 if (code == POINTER_TYPE || code == REFERENCE_TYPE
11261 || code == OFFSET_TYPE || code == FUNCTION_TYPE
11262 || code == METHOD_TYPE || code == ARRAY_TYPE)
11263 return type_is_deprecated (TREE_TYPE (type));
11265 if (TYPE_PTRMEMFUNC_P (type))
11266 return type_is_deprecated
11267 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type))));
11272 /* Decode the list of parameter types for a function type.
11273 Given the list of things declared inside the parens,
11274 return a list of types.
11276 If this parameter does not end with an ellipsis, we append
11279 *PARMS is set to the chain of PARM_DECLs created. */
11282 grokparms (tree parmlist, tree *parms)
11284 tree result = NULL_TREE;
11285 tree decls = NULL_TREE;
11289 for (parm = parmlist; parm != NULL_TREE; parm = TREE_CHAIN (parm))
11291 tree type = NULL_TREE;
11292 tree init = TREE_PURPOSE (parm);
11293 tree decl = TREE_VALUE (parm);
11294 const char *errmsg;
11296 if (parm == void_list_node)
11299 if (! decl || TREE_TYPE (decl) == error_mark_node)
11302 type = TREE_TYPE (decl);
11303 if (VOID_TYPE_P (type))
11305 if (same_type_p (type, void_type_node)
11307 && !DECL_NAME (decl) && !result
11308 && TREE_CHAIN (parm) == void_list_node)
11309 /* DR 577: A parameter list consisting of a single
11310 unnamed parameter of non-dependent type 'void'. */
11312 else if (cv_qualified_p (type))
11313 error_at (DECL_SOURCE_LOCATION (decl),
11314 "invalid use of cv-qualified type %qT in "
11315 "parameter declaration", type);
11317 error_at (DECL_SOURCE_LOCATION (decl),
11318 "invalid use of type %<void%> in parameter "
11320 /* It's not a good idea to actually create parameters of
11321 type `void'; other parts of the compiler assume that a
11322 void type terminates the parameter list. */
11323 type = error_mark_node;
11324 TREE_TYPE (decl) = error_mark_node;
11327 if (type != error_mark_node
11328 && TYPE_FOR_JAVA (type)
11329 && MAYBE_CLASS_TYPE_P (type))
11331 error ("parameter %qD has Java class type", decl);
11332 type = error_mark_node;
11333 TREE_TYPE (decl) = error_mark_node;
11337 if (type != error_mark_node
11338 && (errmsg = targetm.invalid_parameter_type (type)))
11341 type = error_mark_node;
11342 TREE_TYPE (decl) = error_mark_node;
11345 if (type != error_mark_node)
11347 if (deprecated_state != DEPRECATED_SUPPRESS)
11349 tree deptype = type_is_deprecated (type);
11351 warn_deprecated_use (deptype, NULL_TREE);
11354 /* Top-level qualifiers on the parameters are
11355 ignored for function types. */
11356 type = cp_build_qualified_type (type, 0);
11357 if (TREE_CODE (type) == METHOD_TYPE)
11359 error ("parameter %qD invalidly declared method type", decl);
11360 type = build_pointer_type (type);
11361 TREE_TYPE (decl) = type;
11363 else if (abstract_virtuals_error (decl, type))
11364 any_error = 1; /* Seems like a good idea. */
11365 else if (POINTER_TYPE_P (type))
11367 /* [dcl.fct]/6, parameter types cannot contain pointers
11368 (references) to arrays of unknown bound. */
11369 tree t = TREE_TYPE (type);
11370 int ptr = TYPE_PTR_P (type);
11374 if (TYPE_PTR_P (t))
11376 else if (TREE_CODE (t) != ARRAY_TYPE)
11378 else if (!TYPE_DOMAIN (t))
11382 if (TREE_CODE (t) == ARRAY_TYPE)
11384 ? G_("parameter %qD includes pointer to array of "
11385 "unknown bound %qT")
11386 : G_("parameter %qD includes reference to array of "
11387 "unknown bound %qT"),
11393 else if (init && !processing_template_decl)
11394 init = check_default_argument (decl, init, tf_warning_or_error);
11397 DECL_CHAIN (decl) = decls;
11399 result = tree_cons (init, type, result);
11401 decls = nreverse (decls);
11402 result = nreverse (result);
11404 result = chainon (result, void_list_node);
11411 /* D is a constructor or overloaded `operator='.
11413 Let T be the class in which D is declared. Then, this function
11416 -1 if D's is an ill-formed constructor or copy assignment operator
11417 whose first parameter is of type `T'.
11418 0 if D is not a copy constructor or copy assignment
11420 1 if D is a copy constructor or copy assignment operator whose
11421 first parameter is a reference to non-const qualified T.
11422 2 if D is a copy constructor or copy assignment operator whose
11423 first parameter is a reference to const qualified T.
11425 This function can be used as a predicate. Positive values indicate
11426 a copy constructor and nonzero values indicate a copy assignment
11430 copy_fn_p (const_tree d)
11436 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
11438 if (TREE_CODE (d) == TEMPLATE_DECL
11439 || (DECL_TEMPLATE_INFO (d)
11440 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
11441 /* Instantiations of template member functions are never copy
11442 functions. Note that member functions of templated classes are
11443 represented as template functions internally, and we must
11444 accept those as copy functions. */
11447 args = FUNCTION_FIRST_USER_PARMTYPE (d);
11451 arg_type = TREE_VALUE (args);
11452 if (arg_type == error_mark_node)
11455 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
11457 /* Pass by value copy assignment operator. */
11460 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
11461 && !TYPE_REF_IS_RVALUE (arg_type)
11462 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
11464 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
11470 args = TREE_CHAIN (args);
11472 if (args && args != void_list_node && !TREE_PURPOSE (args))
11473 /* There are more non-optional args. */
11479 /* D is a constructor or overloaded `operator='.
11481 Let T be the class in which D is declared. Then, this function
11482 returns true when D is a move constructor or move assignment
11483 operator, false otherwise. */
11486 move_fn_p (const_tree d)
11488 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
11490 if (cxx_dialect == cxx98)
11491 /* There are no move constructors if we are in C++98 mode. */
11494 if (TREE_CODE (d) == TEMPLATE_DECL
11495 || (DECL_TEMPLATE_INFO (d)
11496 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
11497 /* Instantiations of template member functions are never move
11498 functions. Note that member functions of templated classes are
11499 represented as template functions internally, and we must
11500 accept those as move functions. */
11503 return move_signature_fn_p (d);
11506 /* D is a constructor or overloaded `operator='.
11508 Then, this function returns true when D has the same signature as a move
11509 constructor or move assignment operator (because either it is such a
11510 ctor/op= or it is a template specialization with the same signature),
11511 false otherwise. */
11514 move_signature_fn_p (const_tree d)
11518 bool result = false;
11520 args = FUNCTION_FIRST_USER_PARMTYPE (d);
11524 arg_type = TREE_VALUE (args);
11525 if (arg_type == error_mark_node)
11528 if (TREE_CODE (arg_type) == REFERENCE_TYPE
11529 && TYPE_REF_IS_RVALUE (arg_type)
11530 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
11534 args = TREE_CHAIN (args);
11536 if (args && args != void_list_node && !TREE_PURPOSE (args))
11537 /* There are more non-optional args. */
11543 /* Remember any special properties of member function DECL. */
11546 grok_special_member_properties (tree decl)
11550 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
11553 class_type = DECL_CONTEXT (decl);
11554 if (DECL_CONSTRUCTOR_P (decl))
11556 int ctor = copy_fn_p (decl);
11558 if (!DECL_ARTIFICIAL (decl))
11559 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
11565 A non-template constructor for class X is a copy
11566 constructor if its first parameter is of type X&, const
11567 X&, volatile X& or const volatile X&, and either there
11568 are no other parameters or else all other parameters have
11569 default arguments. */
11570 TYPE_HAS_COPY_CTOR (class_type) = 1;
11571 if (user_provided_p (decl))
11572 TYPE_HAS_COMPLEX_COPY_CTOR (class_type) = 1;
11574 TYPE_HAS_CONST_COPY_CTOR (class_type) = 1;
11576 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
11577 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
11578 else if (move_fn_p (decl) && user_provided_p (decl))
11579 TYPE_HAS_COMPLEX_MOVE_CTOR (class_type) = 1;
11580 else if (is_list_ctor (decl))
11581 TYPE_HAS_LIST_CTOR (class_type) = 1;
11583 if (DECL_DECLARED_CONSTEXPR_P (decl)
11584 && !copy_fn_p (decl) && !move_fn_p (decl))
11585 TYPE_HAS_CONSTEXPR_CTOR (class_type) = 1;
11587 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
11591 A non-template assignment operator for class X is a copy
11592 assignment operator if its parameter is of type X, X&, const
11593 X&, volatile X& or const volatile X&. */
11595 int assop = copy_fn_p (decl);
11599 TYPE_HAS_COPY_ASSIGN (class_type) = 1;
11600 if (user_provided_p (decl))
11601 TYPE_HAS_COMPLEX_COPY_ASSIGN (class_type) = 1;
11603 TYPE_HAS_CONST_COPY_ASSIGN (class_type) = 1;
11605 else if (move_fn_p (decl) && user_provided_p (decl))
11606 TYPE_HAS_COMPLEX_MOVE_ASSIGN (class_type) = 1;
11608 /* Destructors are handled in check_methods. */
11611 /* Check a constructor DECL has the correct form. Complains
11612 if the class has a constructor of the form X(X). */
11615 grok_ctor_properties (const_tree ctype, const_tree decl)
11617 int ctor_parm = copy_fn_p (decl);
11623 A declaration of a constructor for a class X is ill-formed if
11624 its first parameter is of type (optionally cv-qualified) X
11625 and either there are no other parameters or else all other
11626 parameters have default arguments.
11628 We *don't* complain about member template instantiations that
11629 have this form, though; they can occur as we try to decide
11630 what constructor to use during overload resolution. Since
11631 overload resolution will never prefer such a constructor to
11632 the non-template copy constructor (which is either explicitly
11633 or implicitly defined), there's no need to worry about their
11634 existence. Theoretically, they should never even be
11635 instantiated, but that's hard to forestall. */
11636 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
11644 /* An operator with this code is unary, but can also be binary. */
11647 ambi_op_p (enum tree_code code)
11649 return (code == INDIRECT_REF
11650 || code == ADDR_EXPR
11651 || code == UNARY_PLUS_EXPR
11652 || code == NEGATE_EXPR
11653 || code == PREINCREMENT_EXPR
11654 || code == PREDECREMENT_EXPR);
11657 /* An operator with this name can only be unary. */
11660 unary_op_p (enum tree_code code)
11662 return (code == TRUTH_NOT_EXPR
11663 || code == BIT_NOT_EXPR
11664 || code == COMPONENT_REF
11665 || code == TYPE_EXPR);
11668 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
11669 errors are issued for invalid declarations. */
11672 grok_op_properties (tree decl, bool complain)
11674 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
11676 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
11677 tree name = DECL_NAME (decl);
11678 enum tree_code operator_code;
11683 /* Count the number of arguments and check for ellipsis. */
11684 for (argtype = argtypes, arity = 0;
11685 argtype && argtype != void_list_node;
11686 argtype = TREE_CHAIN (argtype))
11688 ellipsis_p = !argtype;
11690 class_type = DECL_CONTEXT (decl);
11691 if (class_type && !CLASS_TYPE_P (class_type))
11692 class_type = NULL_TREE;
11694 if (DECL_CONV_FN_P (decl))
11695 operator_code = TYPE_EXPR;
11699 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
11700 if (ansi_opname (CODE) == name) \
11702 operator_code = (CODE); \
11705 else if (ansi_assopname (CODE) == name) \
11707 operator_code = (CODE); \
11708 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
11712 #include "operators.def"
11713 #undef DEF_OPERATOR
11715 gcc_unreachable ();
11718 gcc_assert (operator_code != MAX_TREE_CODES);
11719 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
11722 switch (operator_code)
11725 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
11729 TYPE_GETS_DELETE (class_type) |= 1;
11733 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
11736 case VEC_DELETE_EXPR:
11737 TYPE_GETS_DELETE (class_type) |= 2;
11744 /* [basic.std.dynamic.allocation]/1:
11746 A program is ill-formed if an allocation function is declared
11747 in a namespace scope other than global scope or declared static
11750 The same also holds true for deallocation functions. */
11751 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
11752 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
11754 if (DECL_NAMESPACE_SCOPE_P (decl))
11756 if (CP_DECL_CONTEXT (decl) != global_namespace)
11758 error ("%qD may not be declared within a namespace", decl);
11761 else if (!TREE_PUBLIC (decl))
11763 error ("%qD may not be declared as static", decl);
11766 if (!flag_sized_deallocation && warn_cxx14_compat)
11768 tree parm = FUNCTION_ARG_CHAIN (decl);
11769 if (parm && same_type_p (TREE_VALUE (parm), size_type_node)
11770 && TREE_CHAIN (parm) == void_list_node)
11771 warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wc__14_compat,
11772 "%qD is a usual (non-placement) deallocation "
11773 "function in C++14 (or with -fsized-deallocation)",
11779 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
11781 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
11782 DECL_IS_OPERATOR_NEW (decl) = 1;
11784 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
11785 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
11788 /* An operator function must either be a non-static member function
11789 or have at least one parameter of a class, a reference to a class,
11790 an enumeration, or a reference to an enumeration. 13.4.0.6 */
11791 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
11793 if (operator_code == TYPE_EXPR
11794 || operator_code == CALL_EXPR
11795 || operator_code == COMPONENT_REF
11796 || operator_code == ARRAY_REF
11797 || operator_code == NOP_EXPR)
11799 error ("%qD must be a nonstatic member function", decl);
11806 if (DECL_STATIC_FUNCTION_P (decl))
11808 error ("%qD must be either a non-static member "
11809 "function or a non-member function", decl);
11813 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
11815 tree arg = non_reference (TREE_VALUE (p));
11816 if (arg == error_mark_node)
11819 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
11820 because these checks are performed even on
11821 template functions. */
11822 if (MAYBE_CLASS_TYPE_P (arg)
11823 || TREE_CODE (arg) == ENUMERAL_TYPE)
11827 if (!p || p == void_list_node)
11830 error ("%qD must have an argument of class or "
11831 "enumerated type", decl);
11837 /* There are no restrictions on the arguments to an overloaded
11839 if (operator_code == CALL_EXPR)
11842 /* Warn about conversion operators that will never be used. */
11843 if (IDENTIFIER_TYPENAME_P (name)
11844 && ! DECL_TEMPLATE_INFO (decl)
11846 /* Warn only declaring the function; there is no need to
11847 warn again about out-of-class definitions. */
11848 && class_type == current_class_type)
11850 tree t = TREE_TYPE (name);
11851 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
11854 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
11856 if (VOID_TYPE_P (t))
11857 warning (OPT_Wconversion,
11859 ? G_("conversion to a reference to void "
11860 "will never use a type conversion operator")
11861 : G_("conversion to void "
11862 "will never use a type conversion operator"));
11863 else if (class_type)
11865 if (t == class_type)
11866 warning (OPT_Wconversion,
11868 ? G_("conversion to a reference to the same type "
11869 "will never use a type conversion operator")
11870 : G_("conversion to the same type "
11871 "will never use a type conversion operator"));
11872 /* Don't force t to be complete here. */
11873 else if (MAYBE_CLASS_TYPE_P (t)
11874 && COMPLETE_TYPE_P (t)
11875 && DERIVED_FROM_P (t, class_type))
11876 warning (OPT_Wconversion,
11878 ? G_("conversion to a reference to a base class "
11879 "will never use a type conversion operator")
11880 : G_("conversion to a base class "
11881 "will never use a type conversion operator"));
11886 if (operator_code == COND_EXPR)
11889 error ("ISO C++ prohibits overloading operator ?:");
11892 else if (ellipsis_p)
11894 error ("%qD must not have variable number of arguments", decl);
11897 else if (ambi_op_p (operator_code))
11900 /* We pick the one-argument operator codes by default, so
11901 we don't have to change anything. */
11903 else if (arity == 2)
11905 /* If we thought this was a unary operator, we now know
11906 it to be a binary operator. */
11907 switch (operator_code)
11910 operator_code = MULT_EXPR;
11914 operator_code = BIT_AND_EXPR;
11917 case UNARY_PLUS_EXPR:
11918 operator_code = PLUS_EXPR;
11922 operator_code = MINUS_EXPR;
11925 case PREINCREMENT_EXPR:
11926 operator_code = POSTINCREMENT_EXPR;
11929 case PREDECREMENT_EXPR:
11930 operator_code = POSTDECREMENT_EXPR;
11934 gcc_unreachable ();
11937 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
11939 if ((operator_code == POSTINCREMENT_EXPR
11940 || operator_code == POSTDECREMENT_EXPR)
11941 && ! processing_template_decl
11942 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
11945 error ("postfix %qD must take %<int%> as its argument",
11948 error ("postfix %qD must take %<int%> as its second "
11956 error ("%qD must take either zero or one argument", decl);
11958 error ("%qD must take either one or two arguments", decl);
11962 /* More Effective C++ rule 6. */
11964 && (operator_code == POSTINCREMENT_EXPR
11965 || operator_code == POSTDECREMENT_EXPR
11966 || operator_code == PREINCREMENT_EXPR
11967 || operator_code == PREDECREMENT_EXPR))
11969 tree arg = TREE_VALUE (argtypes);
11970 tree ret = TREE_TYPE (TREE_TYPE (decl));
11971 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
11972 arg = TREE_TYPE (arg);
11973 arg = TYPE_MAIN_VARIANT (arg);
11974 if (operator_code == PREINCREMENT_EXPR
11975 || operator_code == PREDECREMENT_EXPR)
11977 if (TREE_CODE (ret) != REFERENCE_TYPE
11978 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
11980 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
11981 build_reference_type (arg));
11985 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
11986 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
11990 else if (unary_op_p (operator_code))
11995 error ("%qD must take %<void%>", decl);
11997 error ("%qD must take exactly one argument", decl);
12001 else /* if (binary_op_p (operator_code)) */
12006 error ("%qD must take exactly one argument", decl);
12008 error ("%qD must take exactly two arguments", decl);
12012 /* More Effective C++ rule 7. */
12014 && (operator_code == TRUTH_ANDIF_EXPR
12015 || operator_code == TRUTH_ORIF_EXPR
12016 || operator_code == COMPOUND_EXPR))
12017 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
12021 /* Effective C++ rule 23. */
12024 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
12025 && (operator_code == PLUS_EXPR
12026 || operator_code == MINUS_EXPR
12027 || operator_code == TRUNC_DIV_EXPR
12028 || operator_code == MULT_EXPR
12029 || operator_code == TRUNC_MOD_EXPR)
12030 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
12031 warning (OPT_Weffc__, "%qD should return by value", decl);
12033 /* [over.oper]/8 */
12034 for (; argtypes && argtypes != void_list_node;
12035 argtypes = TREE_CHAIN (argtypes))
12036 if (TREE_PURPOSE (argtypes))
12038 TREE_PURPOSE (argtypes) = NULL_TREE;
12039 if (operator_code == POSTINCREMENT_EXPR
12040 || operator_code == POSTDECREMENT_EXPR)
12042 pedwarn (input_location, OPT_Wpedantic, "%qD cannot have default arguments",
12047 error ("%qD cannot have default arguments", decl);
12055 /* Return a string giving the keyword associate with CODE. */
12057 static const char *
12058 tag_name (enum tag_types code)
12070 case typename_type:
12073 gcc_unreachable ();
12077 /* Name lookup in an elaborated-type-specifier (after the keyword
12078 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
12079 elaborated-type-specifier is invalid, issue a diagnostic and return
12080 error_mark_node; otherwise, return the *_TYPE to which it referred.
12081 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
12084 check_elaborated_type_specifier (enum tag_types tag_code,
12086 bool allow_template_p)
12092 struct S { struct S *p; };
12094 name lookup will find the TYPE_DECL for the implicit "S::S"
12095 typedef. Adjust for that here. */
12096 if (DECL_SELF_REFERENCE_P (decl))
12097 decl = TYPE_NAME (TREE_TYPE (decl));
12099 type = TREE_TYPE (decl);
12101 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
12102 is false for this case as well. */
12103 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
12105 error ("using template type parameter %qT after %qs",
12106 type, tag_name (tag_code));
12107 return error_mark_node;
12109 /* Accept template template parameters. */
12110 else if (allow_template_p
12111 && (TREE_CODE (type) == BOUND_TEMPLATE_TEMPLATE_PARM
12112 || TREE_CODE (type) == TEMPLATE_TEMPLATE_PARM))
12116 If the identifier resolves to a typedef-name or the
12117 simple-template-id resolves to an alias template
12118 specialization, the elaborated-type-specifier is ill-formed.
12120 In other words, the only legitimate declaration to use in the
12121 elaborated type specifier is the implicit typedef created when
12122 the type is declared. */
12123 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
12124 && !DECL_SELF_REFERENCE_P (decl)
12125 && tag_code != typename_type)
12127 if (alias_template_specialization_p (type))
12128 error ("using alias template specialization %qT after %qs",
12129 type, tag_name (tag_code));
12131 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
12132 inform (DECL_SOURCE_LOCATION (decl),
12133 "%qD has a previous declaration here", decl);
12134 return error_mark_node;
12136 else if (TREE_CODE (type) != RECORD_TYPE
12137 && TREE_CODE (type) != UNION_TYPE
12138 && tag_code != enum_type
12139 && tag_code != typename_type)
12141 error ("%qT referred to as %qs", type, tag_name (tag_code));
12142 inform (input_location, "%q+T has a previous declaration here", type);
12143 return error_mark_node;
12145 else if (TREE_CODE (type) != ENUMERAL_TYPE
12146 && tag_code == enum_type)
12148 error ("%qT referred to as enum", type);
12149 inform (input_location, "%q+T has a previous declaration here", type);
12150 return error_mark_node;
12152 else if (!allow_template_p
12153 && TREE_CODE (type) == RECORD_TYPE
12154 && CLASSTYPE_IS_TEMPLATE (type))
12156 /* If a class template appears as elaborated type specifier
12157 without a template header such as:
12159 template <class T> class C {};
12160 void f(class C); // No template header here
12162 then the required template argument is missing. */
12163 error ("template argument required for %<%s %T%>",
12164 tag_name (tag_code),
12165 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
12166 return error_mark_node;
12172 /* Lookup NAME in elaborate type specifier in scope according to
12173 SCOPE and issue diagnostics if necessary.
12174 Return *_TYPE node upon success, NULL_TREE when the NAME is not
12175 found, and ERROR_MARK_NODE for type error. */
12178 lookup_and_check_tag (enum tag_types tag_code, tree name,
12179 tag_scope scope, bool template_header_p)
12183 if (scope == ts_global)
12185 /* First try ordinary name lookup, ignoring hidden class name
12186 injected via friend declaration. */
12187 decl = lookup_name_prefer_type (name, 2);
12188 /* If that fails, the name will be placed in the smallest
12189 non-class, non-function-prototype scope according to 3.3.1/5.
12190 We may already have a hidden name declared as friend in this
12191 scope. So lookup again but not ignoring hidden names.
12192 If we find one, that name will be made visible rather than
12193 creating a new tag. */
12195 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
12198 decl = lookup_type_scope (name, scope);
12201 && (DECL_CLASS_TEMPLATE_P (decl)
12202 /* If scope is ts_current we're defining a class, so ignore a
12203 template template parameter. */
12204 || (scope != ts_current
12205 && DECL_TEMPLATE_TEMPLATE_PARM_P (decl))))
12206 decl = DECL_TEMPLATE_RESULT (decl);
12208 if (decl && TREE_CODE (decl) == TYPE_DECL)
12210 /* Look for invalid nested type:
12214 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
12216 error ("%qD has the same name as the class in which it is "
12219 return error_mark_node;
12222 /* Two cases we need to consider when deciding if a class
12223 template is allowed as an elaborated type specifier:
12224 1. It is a self reference to its own class.
12225 2. It comes with a template header.
12229 template <class T> class C {
12230 class C *c1; // DECL_SELF_REFERENCE_P is true
12233 template <class U> class C; // template_header_p is true
12234 template <class T> class C<T>::D {
12235 class C *c2; // DECL_SELF_REFERENCE_P is true
12238 t = check_elaborated_type_specifier (tag_code,
12241 | DECL_SELF_REFERENCE_P (decl));
12244 else if (decl && TREE_CODE (decl) == TREE_LIST)
12246 error ("reference to %qD is ambiguous", name);
12247 print_candidates (decl);
12248 return error_mark_node;
12254 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
12255 Define the tag as a forward-reference if it is not defined.
12257 If a declaration is given, process it here, and report an error if
12258 multiple declarations are not identical.
12260 SCOPE is TS_CURRENT when this is also a definition. Only look in
12261 the current frame for the name (since C++ allows new names in any
12262 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
12263 declaration. Only look beginning from the current scope outward up
12264 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
12266 TEMPLATE_HEADER_P is true when this declaration is preceded by
12267 a set of template parameters. */
12270 xref_tag_1 (enum tag_types tag_code, tree name,
12271 tag_scope orig_scope, bool template_header_p)
12273 enum tree_code code;
12275 tree context = NULL_TREE;
12278 gcc_assert (identifier_p (name));
12284 code = RECORD_TYPE;
12290 code = ENUMERAL_TYPE;
12293 gcc_unreachable ();
12296 if (orig_scope == ts_lambda)
12297 scope = ts_current;
12299 scope = orig_scope;
12301 /* In case of anonymous name, xref_tag is only called to
12302 make type node and push name. Name lookup is not required. */
12303 if (ANON_AGGRNAME_P (name))
12306 t = lookup_and_check_tag (tag_code, name,
12307 scope, template_header_p);
12309 if (t == error_mark_node)
12310 return error_mark_node;
12312 if (scope != ts_current && t && current_class_type
12313 && template_class_depth (current_class_type)
12314 && template_header_p)
12316 if (TREE_CODE (t) == TEMPLATE_TEMPLATE_PARM)
12319 /* Since SCOPE is not TS_CURRENT, we are not looking at a
12320 definition of this tag. Since, in addition, we are currently
12321 processing a (member) template declaration of a template
12322 class, we must be very careful; consider:
12329 { template <class V>
12330 friend struct S1; };
12332 Here, the S2::S1 declaration should not be confused with the
12333 outer declaration. In particular, the inner version should
12334 have a template parameter of level 2, not level 1. This
12335 would be particularly important if the member declaration
12338 template <class V = U> friend struct S1;
12340 say, when we should tsubst into `U' when instantiating
12341 S2. On the other hand, when presented with:
12351 we must find the inner binding eventually. We
12352 accomplish this by making sure that the new type we
12353 create to represent this declaration has the right
12355 context = TYPE_CONTEXT (t);
12361 /* If no such tag is yet defined, create a forward-reference node
12362 and record it as the "definition".
12363 When a real declaration of this type is found,
12364 the forward-reference will be altered into a real type. */
12365 if (code == ENUMERAL_TYPE)
12367 error ("use of enum %q#D without previous declaration", name);
12368 return error_mark_node;
12372 t = make_class_type (code);
12373 TYPE_CONTEXT (t) = context;
12374 if (orig_scope == ts_lambda)
12375 /* Remember that we're declaring a lambda to avoid bogus errors
12376 in push_template_decl. */
12377 CLASSTYPE_LAMBDA_EXPR (t) = error_mark_node;
12378 t = pushtag (name, t, scope);
12383 if (template_header_p && MAYBE_CLASS_TYPE_P (t))
12385 if (!redeclare_class_template (t, current_template_parms))
12386 return error_mark_node;
12388 else if (!processing_template_decl
12389 && CLASS_TYPE_P (t)
12390 && CLASSTYPE_IS_TEMPLATE (t))
12392 error ("redeclaration of %qT as a non-template", t);
12393 error ("previous declaration %q+D", t);
12394 return error_mark_node;
12397 /* Make injected friend class visible. */
12398 if (scope != ts_within_enclosing_non_class
12399 && hidden_name_p (TYPE_NAME (t)))
12401 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
12402 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
12404 if (TYPE_TEMPLATE_INFO (t))
12406 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
12407 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
12415 /* Wrapper for xref_tag_1. */
12418 xref_tag (enum tag_types tag_code, tree name,
12419 tag_scope scope, bool template_header_p)
12423 subtime = timevar_cond_start (TV_NAME_LOOKUP);
12424 ret = xref_tag_1 (tag_code, name, scope, template_header_p);
12425 timevar_cond_stop (TV_NAME_LOOKUP, subtime);
12431 xref_tag_from_type (tree old, tree id, tag_scope scope)
12433 enum tag_types tag_kind;
12435 if (TREE_CODE (old) == RECORD_TYPE)
12436 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
12438 tag_kind = union_type;
12440 if (id == NULL_TREE)
12441 id = TYPE_IDENTIFIER (old);
12443 return xref_tag (tag_kind, id, scope, false);
12446 /* Create the binfo hierarchy for REF with (possibly NULL) base list
12447 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
12448 access_* node, and the TREE_VALUE is the type of the base-class.
12449 Non-NULL TREE_TYPE indicates virtual inheritance.
12451 Returns true if the binfo hierarchy was successfully created,
12452 false if an error was detected. */
12455 xref_basetypes (tree ref, tree base_list)
12458 tree binfo, base_binfo;
12459 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
12460 unsigned max_bases = 0; /* Maximum direct bases. */
12462 tree default_access;
12463 tree igo_prev; /* Track Inheritance Graph Order. */
12465 if (ref == error_mark_node)
12468 /* The base of a derived class is private by default, all others are
12470 default_access = (TREE_CODE (ref) == RECORD_TYPE
12471 && CLASSTYPE_DECLARED_CLASS (ref)
12472 ? access_private_node : access_public_node);
12474 /* First, make sure that any templates in base-classes are
12475 instantiated. This ensures that if we call ourselves recursively
12476 we do not get confused about which classes are marked and which
12478 basep = &base_list;
12481 tree basetype = TREE_VALUE (*basep);
12483 /* The dependent_type_p call below should really be dependent_scope_p
12484 so that we give a hard error about using an incomplete type as a
12485 base, but we allow it with a pedwarn for backward
12487 if (processing_template_decl
12488 && CLASS_TYPE_P (basetype) && TYPE_BEING_DEFINED (basetype))
12489 cxx_incomplete_type_diagnostic (NULL_TREE, basetype, DK_PEDWARN);
12490 if (!dependent_type_p (basetype)
12491 && !complete_type_or_else (basetype, NULL))
12492 /* An incomplete type. Remove it from the list. */
12493 *basep = TREE_CHAIN (*basep);
12497 if (TREE_TYPE (*basep))
12499 if (CLASS_TYPE_P (basetype))
12500 max_vbases += vec_safe_length (CLASSTYPE_VBASECLASSES (basetype));
12501 basep = &TREE_CHAIN (*basep);
12505 TYPE_MARKED_P (ref) = 1;
12507 /* The binfo slot should be empty, unless this is an (ill-formed)
12509 if (TYPE_BINFO (ref) && !TYPE_SIZE (ref))
12511 error ("redefinition of %q#T", ref);
12515 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
12517 binfo = make_tree_binfo (max_bases);
12519 TYPE_BINFO (ref) = binfo;
12520 BINFO_OFFSET (binfo) = size_zero_node;
12521 BINFO_TYPE (binfo) = ref;
12523 /* Apply base-class info set up to the variants of this type. */
12524 fixup_type_variants (ref);
12528 vec_alloc (BINFO_BASE_ACCESSES (binfo), max_bases);
12529 /* An aggregate cannot have baseclasses. */
12530 CLASSTYPE_NON_AGGREGATE (ref) = 1;
12532 if (TREE_CODE (ref) == UNION_TYPE)
12534 error ("derived union %qT invalid", ref);
12541 if (TYPE_FOR_JAVA (ref))
12543 error ("Java class %qT cannot have multiple bases", ref);
12550 vec_alloc (CLASSTYPE_VBASECLASSES (ref), max_vbases);
12552 if (TYPE_FOR_JAVA (ref))
12554 error ("Java class %qT cannot have virtual bases", ref);
12559 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
12561 tree access = TREE_PURPOSE (base_list);
12562 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
12563 tree basetype = TREE_VALUE (base_list);
12565 if (access == access_default_node)
12566 access = default_access;
12568 if (PACK_EXPANSION_P (basetype))
12569 basetype = PACK_EXPANSION_PATTERN (basetype);
12570 if (TREE_CODE (basetype) == TYPE_DECL)
12571 basetype = TREE_TYPE (basetype);
12572 if (!MAYBE_CLASS_TYPE_P (basetype) || TREE_CODE (basetype) == UNION_TYPE)
12574 error ("base type %qT fails to be a struct or class type",
12579 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
12580 TYPE_FOR_JAVA (ref) = 1;
12582 base_binfo = NULL_TREE;
12583 if (CLASS_TYPE_P (basetype) && !dependent_scope_p (basetype))
12585 base_binfo = TYPE_BINFO (basetype);
12586 /* The original basetype could have been a typedef'd type. */
12587 basetype = BINFO_TYPE (base_binfo);
12589 /* Inherit flags from the base. */
12590 TYPE_HAS_NEW_OPERATOR (ref)
12591 |= TYPE_HAS_NEW_OPERATOR (basetype);
12592 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
12593 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
12594 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
12595 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
12596 CLASSTYPE_DIAMOND_SHAPED_P (ref)
12597 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
12598 CLASSTYPE_REPEATED_BASE_P (ref)
12599 |= CLASSTYPE_REPEATED_BASE_P (basetype);
12602 /* We must do this test after we've seen through a typedef
12604 if (TYPE_MARKED_P (basetype))
12606 if (basetype == ref)
12607 error ("recursive type %qT undefined", basetype);
12609 error ("duplicate base type %qT invalid", basetype);
12613 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
12614 /* Regenerate the pack expansion for the bases. */
12615 basetype = make_pack_expansion (basetype);
12617 TYPE_MARKED_P (basetype) = 1;
12619 base_binfo = copy_binfo (base_binfo, basetype, ref,
12620 &igo_prev, via_virtual);
12621 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
12622 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
12624 BINFO_BASE_APPEND (binfo, base_binfo);
12625 BINFO_BASE_ACCESS_APPEND (binfo, access);
12628 if (vec_safe_length (CLASSTYPE_VBASECLASSES (ref)) < max_vbases)
12629 /* If we didn't get max_vbases vbases, we must have shared at
12630 least one of them, and are therefore diamond shaped. */
12631 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
12633 /* Unmark all the types. */
12634 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
12635 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
12636 TYPE_MARKED_P (ref) = 0;
12638 /* Now see if we have a repeated base type. */
12639 if (!CLASSTYPE_REPEATED_BASE_P (ref))
12641 for (base_binfo = binfo; base_binfo;
12642 base_binfo = TREE_CHAIN (base_binfo))
12644 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
12646 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
12649 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
12651 for (base_binfo = binfo; base_binfo;
12652 base_binfo = TREE_CHAIN (base_binfo))
12653 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
12654 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
12663 /* Copies the enum-related properties from type SRC to type DST.
12664 Used with the underlying type of an enum and the enum itself. */
12666 copy_type_enum (tree dst, tree src)
12669 for (t = dst; t; t = TYPE_NEXT_VARIANT (t))
12671 TYPE_MIN_VALUE (t) = TYPE_MIN_VALUE (src);
12672 TYPE_MAX_VALUE (t) = TYPE_MAX_VALUE (src);
12673 TYPE_SIZE (t) = TYPE_SIZE (src);
12674 TYPE_SIZE_UNIT (t) = TYPE_SIZE_UNIT (src);
12675 SET_TYPE_MODE (dst, TYPE_MODE (src));
12676 TYPE_PRECISION (t) = TYPE_PRECISION (src);
12677 TYPE_ALIGN (t) = TYPE_ALIGN (src);
12678 TYPE_USER_ALIGN (t) = TYPE_USER_ALIGN (src);
12679 TYPE_UNSIGNED (t) = TYPE_UNSIGNED (src);
12683 /* Begin compiling the definition of an enumeration type.
12686 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
12688 UNDERLYING_TYPE is the type that will be used as the storage for
12689 the enumeration type. This should be NULL_TREE if no storage type
12692 SCOPED_ENUM_P is true if this is a scoped enumeration type.
12694 if IS_NEW is not NULL, gets TRUE iff a new type is created.
12696 Returns the type object, as yet incomplete.
12697 Also records info about it so that build_enumerator
12698 may be used to declare the individual values as they are read. */
12701 start_enum (tree name, tree enumtype, tree underlying_type,
12702 bool scoped_enum_p, bool *is_new)
12704 tree prevtype = NULL_TREE;
12705 gcc_assert (identifier_p (name));
12709 /* [C++0x dcl.enum]p5:
12711 If not explicitly specified, the underlying type of a scoped
12712 enumeration type is int. */
12713 if (!underlying_type && scoped_enum_p)
12714 underlying_type = integer_type_node;
12716 if (underlying_type)
12717 underlying_type = cv_unqualified (underlying_type);
12719 /* If this is the real definition for a previous forward reference,
12720 fill in the contents in the same object that used to be the
12721 forward reference. */
12723 enumtype = lookup_and_check_tag (enum_type, name,
12724 /*tag_scope=*/ts_current,
12725 /*template_header_p=*/false);
12727 /* In case of a template_decl, the only check that should be deferred
12728 to instantiation time is the comparison of underlying types. */
12729 if (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE)
12731 if (scoped_enum_p != SCOPED_ENUM_P (enumtype))
12733 error_at (input_location, "scoped/unscoped mismatch "
12734 "in enum %q#T", enumtype);
12735 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
12736 "previous definition here");
12737 enumtype = error_mark_node;
12739 else if (ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) != !! underlying_type)
12741 error_at (input_location, "underlying type 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 (underlying_type && ENUM_UNDERLYING_TYPE (enumtype)
12748 && !dependent_type_p (underlying_type)
12749 && !dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype))
12750 && !same_type_p (underlying_type,
12751 ENUM_UNDERLYING_TYPE (enumtype)))
12753 error_at (input_location, "different underlying type "
12754 "in enum %q#T", enumtype);
12755 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
12756 "previous definition here");
12757 underlying_type = NULL_TREE;
12761 if (!enumtype || TREE_CODE (enumtype) != ENUMERAL_TYPE
12762 || processing_template_decl)
12764 /* In case of error, make a dummy enum to allow parsing to
12766 if (enumtype == error_mark_node)
12768 name = make_anon_name ();
12769 enumtype = NULL_TREE;
12772 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
12773 of an opaque enum, or an opaque enum of an already defined
12774 enumeration (C++0x only).
12775 In any other case, it'll be NULL_TREE. */
12781 prevtype = enumtype;
12783 /* Do not push the decl more than once, unless we need to
12784 compare underlying types at instantiation time */
12786 || TREE_CODE (enumtype) != ENUMERAL_TYPE
12787 || (underlying_type
12788 && dependent_type_p (underlying_type))
12789 || (ENUM_UNDERLYING_TYPE (enumtype)
12790 && dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype))))
12792 enumtype = cxx_make_type (ENUMERAL_TYPE);
12793 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
12796 enumtype = xref_tag (enum_type, name, /*tag_scope=*/ts_current,
12799 if (enumtype == error_mark_node)
12800 return error_mark_node;
12802 /* The enum is considered opaque until the opening '{' of the
12803 enumerator list. */
12804 SET_OPAQUE_ENUM_P (enumtype, true);
12805 ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) = !! underlying_type;
12808 SET_SCOPED_ENUM_P (enumtype, scoped_enum_p);
12810 if (underlying_type)
12812 if (CP_INTEGRAL_TYPE_P (underlying_type))
12814 copy_type_enum (enumtype, underlying_type);
12815 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
12817 else if (dependent_type_p (underlying_type))
12818 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
12820 error ("underlying type %<%T%> of %<%T%> must be an integral type",
12821 underlying_type, enumtype);
12824 /* If into a template class, the returned enum is always the first
12825 declaration (opaque or not) seen. This way all the references to
12826 this type will be to the same declaration. The following ones are used
12827 only to check for definition errors. */
12828 if (prevtype && processing_template_decl)
12834 /* After processing and defining all the values of an enumeration type,
12835 install their decls in the enumeration type.
12836 ENUMTYPE is the type object. */
12839 finish_enum_value_list (tree enumtype)
12842 tree underlying_type;
12845 tree minnode, maxnode;
12848 bool fixed_underlying_type_p
12849 = ENUM_UNDERLYING_TYPE (enumtype) != NULL_TREE;
12851 /* We built up the VALUES in reverse order. */
12852 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
12854 /* For an enum defined in a template, just set the type of the values;
12855 all further processing is postponed until the template is
12856 instantiated. We need to set the type so that tsubst of a CONST_DECL
12858 if (processing_template_decl)
12860 for (values = TYPE_VALUES (enumtype);
12862 values = TREE_CHAIN (values))
12863 TREE_TYPE (TREE_VALUE (values)) = enumtype;
12867 /* Determine the minimum and maximum values of the enumerators. */
12868 if (TYPE_VALUES (enumtype))
12870 minnode = maxnode = NULL_TREE;
12872 for (values = TYPE_VALUES (enumtype);
12874 values = TREE_CHAIN (values))
12876 decl = TREE_VALUE (values);
12878 /* [dcl.enum]: Following the closing brace of an enum-specifier,
12879 each enumerator has the type of its enumeration. Prior to the
12880 closing brace, the type of each enumerator is the type of its
12881 initializing value. */
12882 TREE_TYPE (decl) = enumtype;
12884 /* Update the minimum and maximum values, if appropriate. */
12885 value = DECL_INITIAL (decl);
12886 if (value == error_mark_node)
12887 value = integer_zero_node;
12888 /* Figure out what the minimum and maximum values of the
12889 enumerators are. */
12891 minnode = maxnode = value;
12892 else if (tree_int_cst_lt (maxnode, value))
12894 else if (tree_int_cst_lt (value, minnode))
12901 If the enumerator-list is empty, the underlying type is as if
12902 the enumeration had a single enumerator with value 0. */
12903 minnode = maxnode = integer_zero_node;
12905 if (!fixed_underlying_type_p)
12907 /* Compute the number of bits require to represent all values of the
12908 enumeration. We must do this before the type of MINNODE and
12909 MAXNODE are transformed, since tree_int_cst_min_precision relies
12910 on the TREE_TYPE of the value it is passed. */
12911 signop sgn = tree_int_cst_sgn (minnode) >= 0 ? UNSIGNED : SIGNED;
12912 int lowprec = tree_int_cst_min_precision (minnode, sgn);
12913 int highprec = tree_int_cst_min_precision (maxnode, sgn);
12914 int precision = MAX (lowprec, highprec);
12916 bool use_short_enum;
12918 /* Determine the underlying type of the enumeration.
12922 The underlying type of an enumeration is an integral type that
12923 can represent all the enumerator values defined in the
12924 enumeration. It is implementation-defined which integral type is
12925 used as the underlying type for an enumeration except that the
12926 underlying type shall not be larger than int unless the value of
12927 an enumerator cannot fit in an int or unsigned int.
12929 We use "int" or an "unsigned int" as the underlying type, even if
12930 a smaller integral type would work, unless the user has
12931 explicitly requested that we use the smallest possible type. The
12932 user can request that for all enumerations with a command line
12933 flag, or for just one enumeration with an attribute. */
12935 use_short_enum = flag_short_enums
12936 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
12938 for (itk = (use_short_enum ? itk_char : itk_int);
12942 underlying_type = integer_types[itk];
12943 if (underlying_type != NULL_TREE
12944 && TYPE_PRECISION (underlying_type) >= precision
12945 && TYPE_SIGN (underlying_type) == sgn)
12948 if (itk == itk_none)
12952 IF no integral type can represent all the enumerator values, the
12953 enumeration is ill-formed. */
12954 error ("no integral type can represent all of the enumerator values "
12955 "for %qT", enumtype);
12956 precision = TYPE_PRECISION (long_long_integer_type_node);
12957 underlying_type = integer_types[itk_unsigned_long_long];
12962 The value of sizeof() applied to an enumeration type, an object
12963 of an enumeration type, or an enumerator, is the value of sizeof()
12964 applied to the underlying type. */
12965 copy_type_enum (enumtype, underlying_type);
12967 /* Compute the minimum and maximum values for the type.
12971 For an enumeration where emin is the smallest enumerator and emax
12972 is the largest, the values of the enumeration are the values of the
12973 underlying type in the range bmin to bmax, where bmin and bmax are,
12974 respectively, the smallest and largest values of the smallest bit-
12975 field that can store emin and emax. */
12977 /* The middle-end currently assumes that types with TYPE_PRECISION
12978 narrower than their underlying type are suitably zero or sign
12979 extended to fill their mode. Similarly, it assumes that the front
12980 end assures that a value of a particular type must be within
12981 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
12983 We used to set these fields based on bmin and bmax, but that led
12984 to invalid assumptions like optimizing away bounds checking. So
12985 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
12986 TYPE_MAX_VALUE to the values for the mode above and only restrict
12987 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
12988 ENUM_UNDERLYING_TYPE (enumtype)
12989 = build_distinct_type_copy (underlying_type);
12990 TYPE_PRECISION (ENUM_UNDERLYING_TYPE (enumtype)) = precision;
12991 set_min_and_max_values_for_integral_type
12992 (ENUM_UNDERLYING_TYPE (enumtype), precision, sgn);
12994 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
12995 if (flag_strict_enums)
12996 set_min_and_max_values_for_integral_type (enumtype, precision, sgn);
12999 underlying_type = ENUM_UNDERLYING_TYPE (enumtype);
13001 /* Convert each of the enumerators to the type of the underlying
13002 type of the enumeration. */
13003 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
13005 location_t saved_location;
13007 decl = TREE_VALUE (values);
13008 saved_location = input_location;
13009 input_location = DECL_SOURCE_LOCATION (decl);
13010 if (fixed_underlying_type_p)
13011 /* If the enumeration type has a fixed underlying type, we
13012 already checked all of the enumerator values. */
13013 value = DECL_INITIAL (decl);
13015 value = perform_implicit_conversion (underlying_type,
13016 DECL_INITIAL (decl),
13017 tf_warning_or_error);
13018 input_location = saved_location;
13020 /* Do not clobber shared ints. */
13021 value = copy_node (value);
13023 TREE_TYPE (value) = enumtype;
13024 DECL_INITIAL (decl) = value;
13027 /* Fix up all variant types of this enum type. */
13028 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
13029 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
13031 if (at_class_scope_p ()
13032 && COMPLETE_TYPE_P (current_class_type)
13033 && UNSCOPED_ENUM_P (enumtype))
13034 insert_late_enum_def_into_classtype_sorted_fields (enumtype,
13035 current_class_type);
13037 /* Finish debugging output for this type. */
13038 rest_of_type_compilation (enumtype, namespace_bindings_p ());
13041 /* Finishes the enum type. This is called only the first time an
13042 enumeration is seen, be it opaque or odinary.
13043 ENUMTYPE is the type object. */
13046 finish_enum (tree enumtype)
13048 if (processing_template_decl)
13050 if (at_function_scope_p ())
13051 add_stmt (build_min (TAG_DEFN, enumtype));
13055 /* If this is a forward declaration, there should not be any variants,
13056 though we can get a variant in the middle of an enum-specifier with
13057 wacky code like 'enum E { e = sizeof(const E*) };' */
13058 gcc_assert (enumtype == TYPE_MAIN_VARIANT (enumtype)
13059 && (TYPE_VALUES (enumtype)
13060 || !TYPE_NEXT_VARIANT (enumtype)));
13063 /* Build and install a CONST_DECL for an enumeration constant of the
13064 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
13065 LOC is the location of NAME.
13066 Assignment of sequential values by default is handled here. */
13069 build_enumerator (tree name, tree value, tree enumtype, location_t loc)
13075 /* scalar_constant_value will pull out this expression, so make sure
13076 it's folded as appropriate. */
13077 if (processing_template_decl)
13078 value = fold_non_dependent_expr (value);
13080 /* If the VALUE was erroneous, pretend it wasn't there; that will
13081 result in the enum being assigned the next value in sequence. */
13082 if (value == error_mark_node)
13085 /* Remove no-op casts from the value. */
13087 STRIP_TYPE_NOPS (value);
13089 if (! processing_template_decl)
13091 /* Validate and default VALUE. */
13092 if (value != NULL_TREE)
13094 if (!ENUM_UNDERLYING_TYPE (enumtype))
13096 tree tmp_value = build_expr_type_conversion (WANT_INT | WANT_ENUM,
13101 else if (! INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (value)))
13102 value = perform_implicit_conversion_flags
13103 (ENUM_UNDERLYING_TYPE (enumtype), value, tf_warning_or_error,
13104 LOOKUP_IMPLICIT | LOOKUP_NO_NARROWING);
13106 if (value == error_mark_node)
13109 if (value != NULL_TREE)
13111 value = cxx_constant_value (value);
13113 if (TREE_CODE (value) != INTEGER_CST
13114 || ! INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (value)))
13116 error ("enumerator value for %qD is not an integer constant",
13123 /* Default based on previous value. */
13124 if (value == NULL_TREE)
13126 if (TYPE_VALUES (enumtype))
13131 /* C++03 7.2/4: If no initializer is specified for the first
13132 enumerator, the type is an unspecified integral
13133 type. Otherwise the type is the same as the type of the
13134 initializing value of the preceding enumerator unless the
13135 incremented value is not representable in that type, in
13136 which case the type is an unspecified integral type
13137 sufficient to contain the incremented value. */
13138 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
13139 if (error_operand_p (prev_value))
13140 value = error_mark_node;
13143 tree type = TREE_TYPE (prev_value);
13144 signop sgn = TYPE_SIGN (type);
13145 widest_int wi = wi::add (wi::to_widest (prev_value), 1, sgn,
13149 bool pos = !wi::neg_p (wi, sgn);
13150 if (!wi::fits_to_tree_p (wi, type))
13153 for (itk = itk_int; itk != itk_none; itk++)
13155 type = integer_types[itk];
13156 if (type != NULL_TREE
13157 && (pos || !TYPE_UNSIGNED (type))
13158 && wi::fits_to_tree_p (wi, type))
13161 if (type && cxx_dialect < cxx11
13162 && itk > itk_unsigned_long)
13163 pedwarn (input_location, OPT_Wlong_long, pos ? "\
13164 incremented enumerator value is too large for %<unsigned long%>" : "\
13165 incremented enumerator value is too large for %<long%>");
13167 if (type == NULL_TREE)
13170 value = wide_int_to_tree (type, wi);
13175 error ("overflow in enumeration values at %qD", name);
13176 value = error_mark_node;
13181 value = integer_zero_node;
13184 /* Remove no-op casts from the value. */
13185 STRIP_TYPE_NOPS (value);
13187 /* If the underlying type of the enum is fixed, check whether
13188 the enumerator values fits in the underlying type. If it
13189 does not fit, the program is ill-formed [C++0x dcl.enum]. */
13190 if (ENUM_UNDERLYING_TYPE (enumtype)
13192 && TREE_CODE (value) == INTEGER_CST)
13194 if (!int_fits_type_p (value, ENUM_UNDERLYING_TYPE (enumtype)))
13195 error ("enumerator value %E is outside the range of underlying "
13196 "type %<%T%>", value, ENUM_UNDERLYING_TYPE (enumtype));
13198 /* Convert the value to the appropriate type. */
13199 value = convert (ENUM_UNDERLYING_TYPE (enumtype), value);
13203 /* C++ associates enums with global, function, or class declarations. */
13204 context = current_scope ();
13206 /* Build the actual enumeration constant. Note that the enumeration
13207 constants have the underlying type of the enum (if it is fixed)
13208 or the type of their initializer (if the underlying type of the
13209 enum is not fixed):
13213 If the underlying type is fixed, the type of each enumerator
13214 prior to the closing brace is the underlying type; if the
13215 initializing value of an enumerator cannot be represented by
13216 the underlying type, the program is ill-formed. If the
13217 underlying type is not fixed, the type of each enumerator is
13218 the type of its initializing value.
13220 If the underlying type is not fixed, it will be computed by
13221 finish_enum and we will reset the type of this enumerator. Of
13222 course, if we're processing a template, there may be no value. */
13223 type = value ? TREE_TYPE (value) : NULL_TREE;
13225 decl = build_decl (loc, CONST_DECL, name, type);
13227 DECL_CONTEXT (decl) = enumtype;
13228 TREE_CONSTANT (decl) = 1;
13229 TREE_READONLY (decl) = 1;
13230 DECL_INITIAL (decl) = value;
13232 if (context && context == current_class_type && !SCOPED_ENUM_P (enumtype))
13233 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
13234 on the TYPE_FIELDS list for `S'. (That's so that you can say
13235 things like `S::i' later.) */
13236 finish_member_declaration (decl);
13240 /* Add this enumeration constant to the list for this type. */
13241 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
13244 /* Look for an enumerator with the given NAME within the enumeration
13245 type ENUMTYPE. This routine is used primarily for qualified name
13246 lookup into an enumerator in C++0x, e.g.,
13248 enum class Color { Red, Green, Blue };
13250 Color color = Color::Red;
13252 Returns the value corresponding to the enumerator, or
13253 NULL_TREE if no such enumerator was found. */
13255 lookup_enumerator (tree enumtype, tree name)
13258 gcc_assert (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE);
13260 e = purpose_member (name, TYPE_VALUES (enumtype));
13261 return e? TREE_VALUE (e) : NULL_TREE;
13265 /* We're defining DECL. Make sure that its type is OK. */
13268 check_function_type (tree decl, tree current_function_parms)
13270 tree fntype = TREE_TYPE (decl);
13271 tree return_type = complete_type (TREE_TYPE (fntype));
13273 /* In a function definition, arg types must be complete. */
13274 require_complete_types_for_parms (current_function_parms);
13276 if (dependent_type_p (return_type)
13277 || type_uses_auto (return_type))
13279 if (!COMPLETE_OR_VOID_TYPE_P (return_type)
13280 || (TYPE_FOR_JAVA (return_type) && MAYBE_CLASS_TYPE_P (return_type)))
13282 tree args = TYPE_ARG_TYPES (fntype);
13284 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
13285 error ("return type %q#T is incomplete", return_type);
13287 error ("return type has Java class type %q#T", return_type);
13289 /* Make it return void instead. */
13290 if (TREE_CODE (fntype) == METHOD_TYPE)
13291 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
13293 TREE_CHAIN (args));
13295 fntype = build_function_type (void_type_node, args);
13297 = build_exception_variant (fntype,
13298 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
13299 fntype = (cp_build_type_attribute_variant
13300 (fntype, TYPE_ATTRIBUTES (TREE_TYPE (decl))));
13301 TREE_TYPE (decl) = fntype;
13304 abstract_virtuals_error (decl, TREE_TYPE (fntype));
13307 /* Create the FUNCTION_DECL for a function definition.
13308 DECLSPECS and DECLARATOR are the parts of the declaration;
13309 they describe the function's name and the type it returns,
13310 but twisted together in a fashion that parallels the syntax of C.
13312 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
13313 DECLARATOR is really the DECL for the function we are about to
13314 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
13315 indicating that the function is an inline defined in-class.
13317 This function creates a binding context for the function body
13318 as well as setting up the FUNCTION_DECL in current_function_decl.
13320 For C++, we must first check whether that datum makes any sense.
13321 For example, "class A local_a(1,2);" means that variable local_a
13322 is an aggregate of type A, which should have a constructor
13323 applied to it with the argument list [1, 2].
13325 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
13326 or may be a BLOCK if the function has been defined previously
13327 in this translation unit. On exit, DECL_INITIAL (decl1) will be
13328 error_mark_node if the function has never been defined, or
13329 a BLOCK if the function has been defined somewhere. */
13332 start_preparsed_function (tree decl1, tree attrs, int flags)
13334 tree ctype = NULL_TREE;
13337 int doing_friend = 0;
13338 cp_binding_level *bl;
13339 tree current_function_parms;
13340 struct c_fileinfo *finfo
13341 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
13342 bool honor_interface;
13344 /* Sanity check. */
13345 gcc_assert (VOID_TYPE_P (TREE_VALUE (void_list_node)));
13346 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
13348 fntype = TREE_TYPE (decl1);
13349 if (TREE_CODE (fntype) == METHOD_TYPE)
13350 ctype = TYPE_METHOD_BASETYPE (fntype);
13352 /* ISO C++ 11.4/5. A friend function defined in a class is in
13353 the (lexical) scope of the class in which it is defined. */
13354 if (!ctype && DECL_FRIEND_P (decl1))
13356 ctype = DECL_FRIEND_CONTEXT (decl1);
13358 /* CTYPE could be null here if we're dealing with a template;
13359 for example, `inline friend float foo()' inside a template
13360 will have no CTYPE set. */
13361 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
13367 if (DECL_DECLARED_INLINE_P (decl1)
13368 && lookup_attribute ("noinline", attrs))
13369 warning (0, "inline function %q+D given attribute noinline", decl1);
13371 /* Handle gnu_inline attribute. */
13372 if (GNU_INLINE_P (decl1))
13374 DECL_EXTERNAL (decl1) = 1;
13375 DECL_NOT_REALLY_EXTERN (decl1) = 0;
13376 DECL_INTERFACE_KNOWN (decl1) = 1;
13377 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
13380 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
13381 /* This is a constructor, we must ensure that any default args
13382 introduced by this definition are propagated to the clones
13383 now. The clones are used directly in overload resolution. */
13384 adjust_clone_args (decl1);
13386 /* Sometimes we don't notice that a function is a static member, and
13387 build a METHOD_TYPE for it. Fix that up now. */
13388 gcc_assert (!(ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
13389 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE));
13391 /* Set up current_class_type, and enter the scope of the class, if
13394 push_nested_class (ctype);
13395 else if (DECL_STATIC_FUNCTION_P (decl1))
13396 push_nested_class (DECL_CONTEXT (decl1));
13398 /* Now that we have entered the scope of the class, we must restore
13399 the bindings for any template parameters surrounding DECL1, if it
13400 is an inline member template. (Order is important; consider the
13401 case where a template parameter has the same name as a field of
13402 the class.) It is not until after this point that
13403 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
13404 if (flags & SF_INCLASS_INLINE)
13405 maybe_begin_member_template_processing (decl1);
13407 /* Effective C++ rule 15. */
13409 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
13410 && VOID_TYPE_P (TREE_TYPE (fntype)))
13411 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
13413 /* Make the init_value nonzero so pushdecl knows this is not tentative.
13414 error_mark_node is replaced below (in poplevel) with the BLOCK. */
13415 if (!DECL_INITIAL (decl1))
13416 DECL_INITIAL (decl1) = error_mark_node;
13418 /* This function exists in static storage.
13419 (This does not mean `static' in the C sense!) */
13420 TREE_STATIC (decl1) = 1;
13422 /* We must call push_template_decl after current_class_type is set
13423 up. (If we are processing inline definitions after exiting a
13424 class scope, current_class_type will be NULL_TREE until set above
13425 by push_nested_class.) */
13426 if (processing_template_decl)
13428 tree newdecl1 = push_template_decl (decl1);
13429 if (newdecl1 == error_mark_node)
13431 if (ctype || DECL_STATIC_FUNCTION_P (decl1))
13432 pop_nested_class ();
13438 /* We are now in the scope of the function being defined. */
13439 current_function_decl = decl1;
13441 /* Save the parm names or decls from this function's declarator
13442 where store_parm_decls will find them. */
13443 current_function_parms = DECL_ARGUMENTS (decl1);
13445 /* Make sure the parameter and return types are reasonable. When
13446 you declare a function, these types can be incomplete, but they
13447 must be complete when you define the function. */
13448 check_function_type (decl1, current_function_parms);
13450 /* Build the return declaration for the function. */
13451 restype = TREE_TYPE (fntype);
13453 if (DECL_RESULT (decl1) == NULL_TREE)
13457 resdecl = build_decl (input_location, RESULT_DECL, 0, restype);
13458 DECL_ARTIFICIAL (resdecl) = 1;
13459 DECL_IGNORED_P (resdecl) = 1;
13460 DECL_RESULT (decl1) = resdecl;
13462 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
13465 /* Let the user know we're compiling this function. */
13466 announce_function (decl1);
13468 /* Record the decl so that the function name is defined.
13469 If we already have a decl for this name, and it is a FUNCTION_DECL,
13470 use the old decl. */
13471 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
13473 /* A specialization is not used to guide overload resolution. */
13474 if (!DECL_FUNCTION_MEMBER_P (decl1)
13475 && !(DECL_USE_TEMPLATE (decl1) &&
13476 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
13478 tree olddecl = pushdecl (decl1);
13480 if (olddecl == error_mark_node)
13481 /* If something went wrong when registering the declaration,
13482 use DECL1; we have to have a FUNCTION_DECL to use when
13483 parsing the body of the function. */
13487 /* Otherwise, OLDDECL is either a previous declaration
13488 of the same function or DECL1 itself. */
13490 if (warn_missing_declarations
13491 && olddecl == decl1
13492 && !DECL_MAIN_P (decl1)
13493 && TREE_PUBLIC (decl1)
13494 && !DECL_DECLARED_INLINE_P (decl1))
13498 /* Check whether DECL1 is in an anonymous
13500 for (context = DECL_CONTEXT (decl1);
13502 context = DECL_CONTEXT (context))
13504 if (TREE_CODE (context) == NAMESPACE_DECL
13505 && DECL_NAME (context) == NULL_TREE)
13509 if (context == NULL)
13510 warning (OPT_Wmissing_declarations,
13511 "no previous declaration for %q+D", decl1);
13519 /* We need to set the DECL_CONTEXT. */
13520 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
13521 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
13523 fntype = TREE_TYPE (decl1);
13524 restype = TREE_TYPE (fntype);
13526 /* If #pragma weak applies, mark the decl appropriately now.
13527 The pragma only applies to global functions. Because
13528 determining whether or not the #pragma applies involves
13529 computing the mangled name for the declaration, we cannot
13530 apply the pragma until after we have merged this declaration
13531 with any previous declarations; if the original declaration
13532 has a linkage specification, that specification applies to
13533 the definition as well, and may affect the mangled name. */
13534 if (DECL_FILE_SCOPE_P (decl1))
13535 maybe_apply_pragma_weak (decl1);
13538 /* Reset this in case the call to pushdecl changed it. */
13539 current_function_decl = decl1;
13541 gcc_assert (DECL_INITIAL (decl1));
13543 /* This function may already have been parsed, in which case just
13544 return; our caller will skip over the body without parsing. */
13545 if (DECL_INITIAL (decl1) != error_mark_node)
13548 /* Initialize RTL machinery. We cannot do this until
13549 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
13550 even when processing a template; this is how we get
13551 CFUN set up, and our per-function variables initialized.
13552 FIXME factor out the non-RTL stuff. */
13553 bl = current_binding_level;
13554 allocate_struct_function (decl1, processing_template_decl);
13556 /* Initialize the language data structures. Whenever we start
13557 a new function, we destroy temporaries in the usual way. */
13558 cfun->language = ggc_cleared_alloc<language_function> ();
13559 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
13560 current_binding_level = bl;
13562 if (!processing_template_decl && type_uses_auto (restype))
13564 FNDECL_USED_AUTO (decl1) = true;
13565 current_function_auto_return_pattern = restype;
13568 /* Start the statement-tree, start the tree now. */
13569 DECL_SAVED_TREE (decl1) = push_stmt_list ();
13571 /* If we are (erroneously) defining a function that we have already
13572 defined before, wipe out what we knew before. */
13573 if (!DECL_PENDING_INLINE_P (decl1))
13574 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
13576 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
13578 /* We know that this was set up by `grokclassfn'. We do not
13579 wait until `store_parm_decls', since evil parse errors may
13580 never get us to that point. Here we keep the consistency
13581 between `current_class_type' and `current_class_ptr'. */
13582 tree t = DECL_ARGUMENTS (decl1);
13584 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
13585 gcc_assert (TYPE_PTR_P (TREE_TYPE (t)));
13587 cp_function_chain->x_current_class_ref
13588 = cp_build_indirect_ref (t, RO_NULL, tf_warning_or_error);
13589 /* Set this second to avoid shortcut in cp_build_indirect_ref. */
13590 cp_function_chain->x_current_class_ptr = t;
13592 /* Constructors and destructors need to know whether they're "in
13593 charge" of initializing virtual base classes. */
13594 t = DECL_CHAIN (t);
13595 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
13597 current_in_charge_parm = t;
13598 t = DECL_CHAIN (t);
13600 if (DECL_HAS_VTT_PARM_P (decl1))
13602 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
13603 current_vtt_parm = t;
13607 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
13608 /* Implicitly-defined methods (like the
13609 destructor for a class in which no destructor
13610 is explicitly declared) must not be defined
13611 until their definition is needed. So, we
13612 ignore interface specifications for
13613 compiler-generated functions. */
13614 && !DECL_ARTIFICIAL (decl1));
13616 if (processing_template_decl)
13617 /* Don't mess with interface flags. */;
13618 else if (DECL_INTERFACE_KNOWN (decl1))
13620 tree ctx = decl_function_context (decl1);
13622 if (DECL_NOT_REALLY_EXTERN (decl1))
13623 DECL_EXTERNAL (decl1) = 0;
13625 if (ctx != NULL_TREE && vague_linkage_p (ctx))
13626 /* This is a function in a local class in an extern inline
13627 or template function. */
13628 comdat_linkage (decl1);
13630 /* If this function belongs to an interface, it is public.
13631 If it belongs to someone else's interface, it is also external.
13632 This only affects inlines and template instantiations. */
13633 else if (!finfo->interface_unknown && honor_interface)
13635 if (DECL_DECLARED_INLINE_P (decl1)
13636 || DECL_TEMPLATE_INSTANTIATION (decl1))
13638 DECL_EXTERNAL (decl1)
13639 = (finfo->interface_only
13640 || (DECL_DECLARED_INLINE_P (decl1)
13641 && ! flag_implement_inlines
13642 && !DECL_VINDEX (decl1)));
13644 /* For WIN32 we also want to put these in linkonce sections. */
13645 maybe_make_one_only (decl1);
13648 DECL_EXTERNAL (decl1) = 0;
13649 DECL_INTERFACE_KNOWN (decl1) = 1;
13650 /* If this function is in an interface implemented in this file,
13651 make sure that the back end knows to emit this function
13653 if (!DECL_EXTERNAL (decl1))
13654 mark_needed (decl1);
13656 else if (finfo->interface_unknown && finfo->interface_only
13657 && honor_interface)
13659 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
13660 interface, we will have both finfo->interface_unknown and
13661 finfo->interface_only set. In that case, we don't want to
13662 use the normal heuristics because someone will supply a
13663 #pragma implementation elsewhere, and deducing it here would
13664 produce a conflict. */
13665 comdat_linkage (decl1);
13666 DECL_EXTERNAL (decl1) = 0;
13667 DECL_INTERFACE_KNOWN (decl1) = 1;
13668 DECL_DEFER_OUTPUT (decl1) = 1;
13672 /* This is a definition, not a reference.
13673 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
13674 if (!GNU_INLINE_P (decl1))
13675 DECL_EXTERNAL (decl1) = 0;
13677 if ((DECL_DECLARED_INLINE_P (decl1)
13678 || DECL_TEMPLATE_INSTANTIATION (decl1))
13679 && ! DECL_INTERFACE_KNOWN (decl1))
13680 DECL_DEFER_OUTPUT (decl1) = 1;
13682 DECL_INTERFACE_KNOWN (decl1) = 1;
13685 /* Determine the ELF visibility attribute for the function. We must not
13686 do this before calling "pushdecl", as we must allow "duplicate_decls"
13687 to merge any attributes appropriately. We also need to wait until
13689 if (!DECL_CLONED_FUNCTION_P (decl1))
13690 determine_visibility (decl1);
13692 if (!processing_template_decl)
13693 maybe_instantiate_noexcept (decl1);
13695 begin_scope (sk_function_parms, decl1);
13699 if (DECL_DESTRUCTOR_P (decl1)
13700 || (DECL_CONSTRUCTOR_P (decl1)
13701 && targetm.cxx.cdtor_returns_this ()))
13703 cdtor_label = build_decl (input_location,
13704 LABEL_DECL, NULL_TREE, NULL_TREE);
13705 DECL_CONTEXT (cdtor_label) = current_function_decl;
13708 start_fname_decls ();
13710 store_parm_decls (current_function_parms);
13716 /* Like start_preparsed_function, except that instead of a
13717 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
13719 Returns true on success. If the DECLARATOR is not suitable
13720 for a function, we return false, which tells the parser to
13721 skip the entire function. */
13724 start_function (cp_decl_specifier_seq *declspecs,
13725 const cp_declarator *declarator,
13730 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
13731 if (decl1 == error_mark_node)
13733 /* If the declarator is not suitable for a function definition,
13734 cause a syntax error. */
13735 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
13737 error ("invalid function declaration");
13741 if (DECL_MAIN_P (decl1))
13742 /* main must return int. grokfndecl should have corrected it
13743 (and issued a diagnostic) if the user got it wrong. */
13744 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
13745 integer_type_node));
13747 return start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
13750 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
13754 use_eh_spec_block (tree fn)
13756 return (flag_exceptions && flag_enforce_eh_specs
13757 && !processing_template_decl
13758 && !type_throw_all_p (TREE_TYPE (fn))
13759 /* We insert the EH_SPEC_BLOCK only in the original
13760 function; then, it is copied automatically to the
13762 && !DECL_CLONED_FUNCTION_P (fn)
13763 /* Implicitly-generated constructors and destructors have
13764 exception specifications. However, those specifications
13765 are the union of the possible exceptions specified by the
13766 constructors/destructors for bases and members, so no
13767 unallowed exception will ever reach this function. By
13768 not creating the EH_SPEC_BLOCK we save a little memory,
13769 and we avoid spurious warnings about unreachable
13771 && !DECL_DEFAULTED_FN (fn));
13774 /* Store the parameter declarations into the current function declaration.
13775 This is called after parsing the parameter declarations, before
13776 digesting the body of the function.
13778 Also install to binding contour return value identifier, if any. */
13781 store_parm_decls (tree current_function_parms)
13783 tree fndecl = current_function_decl;
13786 /* This is a chain of any other decls that came in among the parm
13787 declarations. If a parm is declared with enum {foo, bar} x;
13788 then CONST_DECLs for foo and bar are put here. */
13789 tree nonparms = NULL_TREE;
13791 if (current_function_parms)
13793 /* This case is when the function was defined with an ANSI prototype.
13794 The parms already have decls, so we need not do anything here
13795 except record them as in effect
13796 and complain if any redundant old-style parm decls were written. */
13798 tree specparms = current_function_parms;
13801 /* Must clear this because it might contain TYPE_DECLs declared
13803 current_binding_level->names = NULL;
13805 /* If we're doing semantic analysis, then we'll call pushdecl
13806 for each of these. We must do them in reverse order so that
13807 they end in the correct forward order. */
13808 specparms = nreverse (specparms);
13810 for (parm = specparms; parm; parm = next)
13812 next = DECL_CHAIN (parm);
13813 if (TREE_CODE (parm) == PARM_DECL)
13815 if (DECL_NAME (parm) == NULL_TREE
13816 || !VOID_TYPE_P (parm))
13819 error ("parameter %qD declared void", parm);
13823 /* If we find an enum constant or a type tag,
13824 put it aside for the moment. */
13825 TREE_CHAIN (parm) = NULL_TREE;
13826 nonparms = chainon (nonparms, parm);
13830 /* Get the decls in their original chain order and record in the
13831 function. This is all and only the PARM_DECLs that were
13832 pushed into scope by the loop above. */
13833 DECL_ARGUMENTS (fndecl) = getdecls ();
13836 DECL_ARGUMENTS (fndecl) = NULL_TREE;
13838 /* Now store the final chain of decls for the arguments
13839 as the decl-chain of the current lexical scope.
13840 Put the enumerators in as well, at the front so that
13841 DECL_ARGUMENTS is not modified. */
13842 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
13844 if (use_eh_spec_block (current_function_decl))
13845 current_eh_spec_block = begin_eh_spec_block ();
13849 /* We have finished doing semantic analysis on DECL, but have not yet
13850 generated RTL for its body. Save away our current state, so that
13851 when we want to generate RTL later we know what to do. */
13854 save_function_data (tree decl)
13856 struct language_function *f;
13858 /* Save the language-specific per-function data so that we can
13859 get it back when we really expand this function. */
13860 gcc_assert (!DECL_PENDING_INLINE_P (decl));
13863 f = ggc_alloc<language_function> ();
13864 memcpy (f, cp_function_chain, sizeof (struct language_function));
13865 DECL_SAVED_FUNCTION_DATA (decl) = f;
13867 /* Clear out the bits we don't need. */
13868 f->base.x_stmt_tree.x_cur_stmt_list = NULL;
13869 f->bindings = NULL;
13870 f->x_local_names = NULL;
13871 f->base.local_typedefs = NULL;
13875 /* Set the return value of the constructor (if present). */
13878 finish_constructor_body (void)
13883 if (targetm.cxx.cdtor_returns_this ()
13884 && (! TYPE_FOR_JAVA (current_class_type)))
13886 /* Any return from a constructor will end up here. */
13887 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
13889 val = DECL_ARGUMENTS (current_function_decl);
13890 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
13891 DECL_RESULT (current_function_decl), val);
13892 /* Return the address of the object. */
13893 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
13894 add_stmt (exprstmt);
13898 /* Do all the processing for the beginning of a destructor; set up the
13899 vtable pointers and cleanups for bases and members. */
13902 begin_destructor_body (void)
13904 tree compound_stmt;
13906 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
13907 issued an error message. We still want to try to process the
13908 body of the function, but initialize_vtbl_ptrs will crash if
13909 TYPE_BINFO is NULL. */
13910 if (COMPLETE_TYPE_P (current_class_type))
13912 compound_stmt = begin_compound_stmt (0);
13913 /* Make all virtual function table pointers in non-virtual base
13914 classes point to CURRENT_CLASS_TYPE's virtual function
13916 initialize_vtbl_ptrs (current_class_ptr);
13917 finish_compound_stmt (compound_stmt);
13919 /* Insert a cleanup to let the back end know that the object is dead
13920 when we exit the destructor, either normally or via exception. */
13921 tree btype = CLASSTYPE_AS_BASE (current_class_type);
13922 tree clobber = build_constructor (btype, NULL);
13923 TREE_THIS_VOLATILE (clobber) = true;
13924 tree bref = build_nop (build_reference_type (btype), current_class_ptr);
13925 bref = convert_from_reference (bref);
13926 tree exprstmt = build2 (MODIFY_EXPR, btype, bref, clobber);
13927 finish_decl_cleanup (NULL_TREE, exprstmt);
13929 /* And insert cleanups for our bases and members so that they
13930 will be properly destroyed if we throw. */
13931 push_base_cleanups ();
13935 /* At the end of every destructor we generate code to delete the object if
13936 necessary. Do that now. */
13939 finish_destructor_body (void)
13943 /* Any return from a destructor will end up here; that way all base
13944 and member cleanups will be run when the function returns. */
13945 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
13947 /* In a virtual destructor, we must call delete. */
13948 if (DECL_VIRTUAL_P (current_function_decl))
13951 tree virtual_size = cxx_sizeof (current_class_type);
13955 At the point of definition of a virtual destructor (including
13956 an implicit definition), non-placement operator delete shall
13957 be looked up in the scope of the destructor's class and if
13958 found shall be accessible and unambiguous. */
13959 exprstmt = build_op_delete_call (DELETE_EXPR, current_class_ptr,
13961 /*global_p=*/false,
13962 /*placement=*/NULL_TREE,
13963 /*alloc_fn=*/NULL_TREE,
13964 tf_warning_or_error);
13966 if_stmt = begin_if_stmt ();
13967 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
13968 current_in_charge_parm,
13971 finish_expr_stmt (exprstmt);
13972 finish_then_clause (if_stmt);
13973 finish_if_stmt (if_stmt);
13976 if (targetm.cxx.cdtor_returns_this ())
13980 val = DECL_ARGUMENTS (current_function_decl);
13981 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
13982 DECL_RESULT (current_function_decl), val);
13983 /* Return the address of the object. */
13984 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
13985 add_stmt (exprstmt);
13989 /* Do the necessary processing for the beginning of a function body, which
13990 in this case includes member-initializers, but not the catch clauses of
13991 a function-try-block. Currently, this means opening a binding level
13992 for the member-initializers (in a ctor), member cleanups (in a dtor),
13993 and capture proxies (in a lambda operator()). */
13996 begin_function_body (void)
14000 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
14003 if (processing_template_decl)
14004 /* Do nothing now. */;
14006 /* Always keep the BLOCK node associated with the outermost pair of
14007 curly braces of a function. These are needed for correct
14008 operation of dwarfout.c. */
14009 keep_next_level (true);
14011 stmt = begin_compound_stmt (BCS_FN_BODY);
14013 if (processing_template_decl)
14014 /* Do nothing now. */;
14015 else if (DECL_DESTRUCTOR_P (current_function_decl))
14016 begin_destructor_body ();
14021 /* Do the processing for the end of a function body. Currently, this means
14022 closing out the cleanups for fully-constructed bases and members, and in
14023 the case of the destructor, deleting the object if desired. Again, this
14024 is only meaningful for [cd]tors, since they are the only functions where
14025 there is a significant distinction between the main body and any
14026 function catch clauses. Handling, say, main() return semantics here
14027 would be wrong, as flowing off the end of a function catch clause for
14028 main() would also need to return 0. */
14031 finish_function_body (tree compstmt)
14033 if (compstmt == NULL_TREE)
14036 /* Close the block. */
14037 finish_compound_stmt (compstmt);
14039 if (processing_template_decl)
14040 /* Do nothing now. */;
14041 else if (DECL_CONSTRUCTOR_P (current_function_decl))
14042 finish_constructor_body ();
14043 else if (DECL_DESTRUCTOR_P (current_function_decl))
14044 finish_destructor_body ();
14047 /* Given a function, returns the BLOCK corresponding to the outermost level
14048 of curly braces, skipping the artificial block created for constructor
14052 outer_curly_brace_block (tree fndecl)
14054 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
14055 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
14056 /* Skip the artificial function body block. */
14057 block = BLOCK_SUBBLOCKS (block);
14061 /* If FNDECL is a class's key method, add the class to the list of
14062 keyed classes that should be emitted. */
14065 record_key_method_defined (tree fndecl)
14067 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
14068 && DECL_VIRTUAL_P (fndecl)
14069 && !processing_template_decl)
14071 tree fnclass = DECL_CONTEXT (fndecl);
14072 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
14073 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
14077 /* Subroutine of finish_function.
14078 Save the body of constexpr functions for possible
14079 future compile time evaluation. */
14082 maybe_save_function_definition (tree fun)
14084 if (!processing_template_decl
14085 && DECL_DECLARED_CONSTEXPR_P (fun)
14086 && !cp_function_chain->invalid_constexpr
14087 && !DECL_CLONED_FUNCTION_P (fun))
14088 register_constexpr_fundef (fun, DECL_SAVED_TREE (fun));
14091 /* Finish up a function declaration and compile that function
14092 all the way to assembler language output. The free the storage
14093 for the function definition.
14095 FLAGS is a bitwise or of the following values:
14097 We just finished processing the body of an in-class inline
14098 function definition. (This processing will have taken place
14099 after the class definition is complete.) */
14102 finish_function (int flags)
14104 tree fndecl = current_function_decl;
14105 tree fntype, ctype = NULL_TREE;
14106 int inclass_inline = (flags & 2) != 0;
14108 /* When we get some parse errors, we can end up without a
14109 current_function_decl, so cope. */
14110 if (fndecl == NULL_TREE)
14111 return error_mark_node;
14113 if (c_dialect_objc ())
14114 objc_finish_function ();
14116 gcc_assert (!defer_mark_used_calls);
14117 defer_mark_used_calls = true;
14119 record_key_method_defined (fndecl);
14121 fntype = TREE_TYPE (fndecl);
14123 /* TREE_READONLY (fndecl) = 1;
14124 This caused &foo to be of type ptr-to-const-function
14125 which then got a warning when stored in a ptr-to-function variable. */
14127 gcc_assert (building_stmt_list_p ());
14128 /* The current function is being defined, so its DECL_INITIAL should
14129 be set, and unless there's a multiple definition, it should be
14130 error_mark_node. */
14131 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
14133 /* For a cloned function, we've already got all the code we need;
14134 there's no need to add any extra bits. */
14135 if (!DECL_CLONED_FUNCTION_P (fndecl))
14137 /* Make it so that `main' always returns 0 by default. */
14138 if (DECL_MAIN_P (current_function_decl))
14139 finish_return_stmt (integer_zero_node);
14141 if (use_eh_spec_block (current_function_decl))
14142 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
14143 (TREE_TYPE (current_function_decl)),
14144 current_eh_spec_block);
14147 /* If we're saving up tree structure, tie off the function now. */
14148 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
14150 if (fn_contains_cilk_spawn_p (cfun) && !processing_template_decl)
14151 cfun->cilk_frame_decl = insert_cilk_frame (fndecl);
14153 finish_fname_decls ();
14155 /* If this function can't throw any exceptions, remember that. */
14156 if (!processing_template_decl
14157 && !cp_function_chain->can_throw
14158 && !flag_non_call_exceptions
14159 && !decl_replaceable_p (fndecl))
14160 TREE_NOTHROW (fndecl) = 1;
14162 /* This must come after expand_function_end because cleanups might
14163 have declarations (from inline functions) that need to go into
14164 this function's blocks. */
14166 /* If the current binding level isn't the outermost binding level
14167 for this function, either there is a bug, or we have experienced
14168 syntax errors and the statement tree is malformed. */
14169 if (current_binding_level->kind != sk_function_parms)
14171 /* Make sure we have already experienced errors. */
14172 gcc_assert (errorcount);
14174 /* Throw away the broken statement tree and extra binding
14176 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
14178 while (current_binding_level->kind != sk_function_parms)
14180 if (current_binding_level->kind == sk_class)
14181 pop_nested_class ();
14183 poplevel (0, 0, 0);
14186 poplevel (1, 0, 1);
14188 /* Statements should always be full-expressions at the outermost set
14189 of curly braces for a function. */
14190 gcc_assert (stmts_are_full_exprs_p ());
14192 /* If there are no return statements in a function with auto return type,
14193 the return type is void. But if the declared type is something like
14194 auto*, this is an error. */
14195 if (!processing_template_decl && FNDECL_USED_AUTO (fndecl)
14196 && TREE_TYPE (fntype) == current_function_auto_return_pattern)
14198 if (!is_auto (current_function_auto_return_pattern)
14199 && !current_function_returns_value && !current_function_returns_null)
14201 error ("no return statements in function returning %qT",
14202 current_function_auto_return_pattern);
14203 inform (input_location, "only plain %<auto%> return type can be "
14204 "deduced to %<void%>");
14206 apply_deduced_return_type (fndecl, void_type_node);
14207 fntype = TREE_TYPE (fndecl);
14210 /* Save constexpr function body before it gets munged by
14211 the NRV transformation. */
14212 maybe_save_function_definition (fndecl);
14214 /* Set up the named return value optimization, if we can. Candidate
14215 variables are selected in check_return_expr. */
14216 if (current_function_return_value)
14218 tree r = current_function_return_value;
14221 if (r != error_mark_node
14222 /* This is only worth doing for fns that return in memory--and
14223 simpler, since we don't have to worry about promoted modes. */
14224 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
14225 /* Only allow this for variables declared in the outer scope of
14226 the function so we know that their lifetime always ends with a
14227 return; see g++.dg/opt/nrv6.C. We could be more flexible if
14228 we were to do this optimization in tree-ssa. */
14229 && (outer = outer_curly_brace_block (fndecl))
14230 && chain_member (r, BLOCK_VARS (outer)))
14231 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
14233 current_function_return_value = NULL_TREE;
14236 /* Remember that we were in class scope. */
14237 if (current_class_name)
14238 ctype = current_class_type;
14240 /* Must mark the RESULT_DECL as being in this function. */
14241 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
14243 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
14244 to the FUNCTION_DECL node itself. */
14245 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
14247 /* Save away current state, if appropriate. */
14248 if (!processing_template_decl)
14249 save_function_data (fndecl);
14251 /* Complain if there's just no return statement. */
14252 if (warn_return_type
14253 && !VOID_TYPE_P (TREE_TYPE (fntype))
14254 && !dependent_type_p (TREE_TYPE (fntype))
14255 && !current_function_returns_value && !current_function_returns_null
14256 /* Don't complain if we abort or throw. */
14257 && !current_function_returns_abnormally
14258 /* Don't complain if there's an infinite loop. */
14259 && !current_function_infinite_loop
14260 /* Don't complain if we are declared noreturn. */
14261 && !TREE_THIS_VOLATILE (fndecl)
14262 && !DECL_NAME (DECL_RESULT (fndecl))
14263 && !TREE_NO_WARNING (fndecl)
14264 /* Structor return values (if any) are set by the compiler. */
14265 && !DECL_CONSTRUCTOR_P (fndecl)
14266 && !DECL_DESTRUCTOR_P (fndecl)
14267 && targetm.warn_func_return (fndecl))
14269 warning (OPT_Wreturn_type,
14270 "no return statement in function returning non-void");
14271 TREE_NO_WARNING (fndecl) = 1;
14274 /* Store the end of the function, so that we get good line number
14275 info for the epilogue. */
14276 cfun->function_end_locus = input_location;
14278 /* Complain about parameters that are only set, but never otherwise used. */
14279 if (warn_unused_but_set_parameter
14280 && !processing_template_decl
14281 && errorcount == unused_but_set_errorcount
14282 && !DECL_CLONED_FUNCTION_P (fndecl))
14286 for (decl = DECL_ARGUMENTS (fndecl);
14288 decl = DECL_CHAIN (decl))
14289 if (TREE_USED (decl)
14290 && TREE_CODE (decl) == PARM_DECL
14291 && !DECL_READ_P (decl)
14292 && DECL_NAME (decl)
14293 && !DECL_ARTIFICIAL (decl)
14294 && !TREE_NO_WARNING (decl)
14295 && !DECL_IN_SYSTEM_HEADER (decl)
14296 && TREE_TYPE (decl) != error_mark_node
14297 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
14298 && (!CLASS_TYPE_P (TREE_TYPE (decl))
14299 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
14300 warning (OPT_Wunused_but_set_parameter,
14301 "parameter %q+D set but not used", decl);
14302 unused_but_set_errorcount = errorcount;
14305 /* Complain about locally defined typedefs that are not used in this
14307 maybe_warn_unused_local_typedefs ();
14309 /* Genericize before inlining. */
14310 if (!processing_template_decl)
14312 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
14313 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl);
14314 cp_genericize (fndecl);
14315 /* Clear out the bits we don't need. */
14316 f->x_current_class_ptr = NULL;
14317 f->x_current_class_ref = NULL;
14318 f->x_eh_spec_block = NULL;
14319 f->x_in_charge_parm = NULL;
14320 f->x_vtt_parm = NULL;
14321 f->x_return_value = NULL;
14322 f->bindings = NULL;
14323 f->extern_decl_map = NULL;
14324 f->infinite_loops = NULL;
14326 /* Clear out the bits we don't need. */
14327 local_names = NULL;
14329 /* We're leaving the context of this function, so zap cfun. It's still in
14330 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
14332 current_function_decl = NULL;
14334 /* If this is an in-class inline definition, we may have to pop the
14335 bindings for the template parameters that we added in
14336 maybe_begin_member_template_processing when start_function was
14338 if (inclass_inline)
14339 maybe_end_member_template_processing ();
14341 /* Leave the scope of the class. */
14343 pop_nested_class ();
14348 current_function_decl = NULL_TREE;
14350 defer_mark_used_calls = false;
14351 if (deferred_mark_used_calls)
14356 FOR_EACH_VEC_SAFE_ELT (deferred_mark_used_calls, i, decl)
14358 vec_free (deferred_mark_used_calls);
14364 /* Create the FUNCTION_DECL for a function definition.
14365 DECLSPECS and DECLARATOR are the parts of the declaration;
14366 they describe the return type and the name of the function,
14367 but twisted together in a fashion that parallels the syntax of C.
14369 This function creates a binding context for the function body
14370 as well as setting up the FUNCTION_DECL in current_function_decl.
14372 Returns a FUNCTION_DECL on success.
14374 If the DECLARATOR is not suitable for a function (it defines a datum
14375 instead), we return 0, which tells yyparse to report a parse error.
14377 May return void_type_node indicating that this method is actually
14378 a friend. See grokfield for more details.
14380 Came here with a `.pushlevel' .
14382 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
14383 CHANGES TO CODE IN `grokfield'. */
14386 grokmethod (cp_decl_specifier_seq *declspecs,
14387 const cp_declarator *declarator, tree attrlist)
14389 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
14392 if (fndecl == error_mark_node)
14393 return error_mark_node;
14395 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
14397 error ("invalid member function declaration");
14398 return error_mark_node;
14402 cplus_decl_attributes (&fndecl, attrlist, 0);
14404 /* Pass friends other than inline friend functions back. */
14405 if (fndecl == void_type_node)
14408 if (DECL_IN_AGGR_P (fndecl))
14410 if (DECL_CLASS_SCOPE_P (fndecl))
14411 error ("%qD is already defined in class %qT", fndecl,
14412 DECL_CONTEXT (fndecl));
14413 return error_mark_node;
14416 check_template_shadow (fndecl);
14418 DECL_COMDAT (fndecl) = 1;
14419 DECL_DECLARED_INLINE_P (fndecl) = 1;
14420 DECL_NO_INLINE_WARNING_P (fndecl) = 1;
14422 /* We process method specializations in finish_struct_1. */
14423 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
14425 fndecl = push_template_decl (fndecl);
14426 if (fndecl == error_mark_node)
14430 if (! DECL_FRIEND_P (fndecl))
14432 if (DECL_CHAIN (fndecl))
14434 fndecl = copy_node (fndecl);
14435 TREE_CHAIN (fndecl) = NULL_TREE;
14439 cp_finish_decl (fndecl, NULL_TREE, false, NULL_TREE, 0);
14441 DECL_IN_AGGR_P (fndecl) = 1;
14446 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
14447 we can lay it out later, when and if its type becomes complete.
14449 Also handle constexpr variables where the initializer involves
14450 an unlowered PTRMEM_CST because the class isn't complete yet. */
14453 maybe_register_incomplete_var (tree var)
14455 gcc_assert (VAR_P (var));
14457 /* Keep track of variables with incomplete types. */
14458 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
14459 && DECL_EXTERNAL (var))
14461 tree inner_type = TREE_TYPE (var);
14463 while (TREE_CODE (inner_type) == ARRAY_TYPE)
14464 inner_type = TREE_TYPE (inner_type);
14465 inner_type = TYPE_MAIN_VARIANT (inner_type);
14467 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
14468 /* RTTI TD entries are created while defining the type_info. */
14469 || (TYPE_LANG_SPECIFIC (inner_type)
14470 && TYPE_BEING_DEFINED (inner_type)))
14472 incomplete_var iv = {var, inner_type};
14473 vec_safe_push (incomplete_vars, iv);
14475 else if (!(DECL_LANG_SPECIFIC (var) && DECL_TEMPLATE_INFO (var))
14476 && decl_constant_var_p (var)
14477 && (TYPE_PTRMEM_P (inner_type) || CLASS_TYPE_P (inner_type)))
14479 /* When the outermost open class is complete we can resolve any
14480 pointers-to-members. */
14481 tree context = outermost_open_class ();
14482 incomplete_var iv = {var, context};
14483 vec_safe_push (incomplete_vars, iv);
14488 /* Called when a class type (given by TYPE) is defined. If there are
14489 any existing VAR_DECLs whose type has been completed by this
14490 declaration, update them now. */
14493 complete_vars (tree type)
14496 incomplete_var *iv;
14498 for (ix = 0; vec_safe_iterate (incomplete_vars, ix, &iv); )
14500 if (same_type_p (type, iv->incomplete_type))
14502 tree var = iv->decl;
14503 tree type = TREE_TYPE (var);
14505 if (TYPE_MAIN_VARIANT (strip_array_types (type))
14506 == iv->incomplete_type)
14508 /* Complete the type of the variable. The VAR_DECL itself
14509 will be laid out in expand_expr. */
14510 complete_type (type);
14511 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
14514 if (DECL_INITIAL (var)
14515 && decl_constant_var_p (var))
14516 DECL_INITIAL (var) = cplus_expand_constant (DECL_INITIAL (var));
14518 /* Remove this entry from the list. */
14519 incomplete_vars->unordered_remove (ix);
14525 /* Check for pending declarations which may have abstract type. */
14526 complete_type_check_abstract (type);
14529 /* If DECL is of a type which needs a cleanup, build and return an
14530 expression to perform that cleanup here. Return NULL_TREE if no
14531 cleanup need be done. */
14534 cxx_maybe_build_cleanup (tree decl, tsubst_flags_t complain)
14540 /* Assume no cleanup is required. */
14541 cleanup = NULL_TREE;
14543 if (error_operand_p (decl))
14546 /* Handle "__attribute__((cleanup))". We run the cleanup function
14547 before the destructor since the destructor is what actually
14548 terminates the lifetime of the object. */
14549 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
14556 /* Get the name specified by the user for the cleanup function. */
14557 id = TREE_VALUE (TREE_VALUE (attr));
14558 /* Look up the name to find the cleanup function to call. It is
14559 important to use lookup_name here because that is what is
14560 used in c-common.c:handle_cleanup_attribute when performing
14561 initial checks on the attribute. Note that those checks
14562 include ensuring that the function found is not an overloaded
14563 function, or an object with an overloaded call operator,
14564 etc.; we can rely on the fact that the function found is an
14565 ordinary FUNCTION_DECL. */
14566 fn = lookup_name (id);
14567 arg = build_address (decl);
14569 cleanup = cp_build_function_call_nary (fn, complain, arg, NULL_TREE);
14570 if (cleanup == error_mark_node)
14571 return error_mark_node;
14573 /* Handle ordinary C++ destructors. */
14574 type = TREE_TYPE (decl);
14575 if (type_build_dtor_call (type))
14577 int flags = LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR;
14581 if (TREE_CODE (type) == ARRAY_TYPE)
14584 addr = build_address (decl);
14586 call = build_delete (TREE_TYPE (addr), addr,
14587 sfk_complete_destructor, flags, 0, complain);
14588 if (call == error_mark_node)
14589 cleanup = error_mark_node;
14590 else if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
14591 /* Discard the call. */;
14593 cleanup = cp_build_compound_expr (cleanup, call, complain);
14598 /* build_delete sets the location of the destructor call to the
14599 current location, even though the destructor is going to be
14600 called later, at the end of the current scope. This can lead to
14601 a "jumpy" behaviour for users of debuggers when they step around
14602 the end of the block. So let's unset the location of the
14603 destructor call instead. */
14604 if (cleanup != NULL && EXPR_P (cleanup))
14605 SET_EXPR_LOCATION (cleanup, UNKNOWN_LOCATION);
14608 && !lookup_attribute ("warn_unused", TYPE_ATTRIBUTES (TREE_TYPE (decl))))
14609 /* Treat objects with destructors as used; the destructor may do
14610 something substantive. */
14617 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
14618 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
14619 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
14622 static_fn_type (tree memfntype)
14627 if (TYPE_PTRMEMFUNC_P (memfntype))
14628 memfntype = TYPE_PTRMEMFUNC_FN_TYPE (memfntype);
14629 if (POINTER_TYPE_P (memfntype)
14630 || TREE_CODE (memfntype) == FUNCTION_DECL)
14631 memfntype = TREE_TYPE (memfntype);
14632 if (TREE_CODE (memfntype) == FUNCTION_TYPE)
14634 gcc_assert (TREE_CODE (memfntype) == METHOD_TYPE);
14635 args = TYPE_ARG_TYPES (memfntype);
14636 cp_ref_qualifier rqual = type_memfn_rqual (memfntype);
14637 fntype = build_function_type (TREE_TYPE (memfntype), TREE_CHAIN (args));
14638 fntype = apply_memfn_quals (fntype, type_memfn_quals (memfntype), rqual);
14639 fntype = (cp_build_type_attribute_variant
14640 (fntype, TYPE_ATTRIBUTES (memfntype)));
14641 fntype = (build_exception_variant
14642 (fntype, TYPE_RAISES_EXCEPTIONS (memfntype)));
14643 if (TYPE_HAS_LATE_RETURN_TYPE (memfntype))
14644 TYPE_HAS_LATE_RETURN_TYPE (fntype) = 1;
14648 /* DECL was originally constructed as a non-static member function,
14649 but turned out to be static. Update it accordingly. */
14652 revert_static_member_fn (tree decl)
14654 tree stype = static_fn_type (decl);
14655 cp_cv_quals quals = type_memfn_quals (stype);
14656 cp_ref_qualifier rqual = type_memfn_rqual (stype);
14658 if (quals != TYPE_UNQUALIFIED || rqual != REF_QUAL_NONE)
14659 stype = apply_memfn_quals (stype, TYPE_UNQUALIFIED, REF_QUAL_NONE);
14661 TREE_TYPE (decl) = stype;
14663 if (DECL_ARGUMENTS (decl))
14664 DECL_ARGUMENTS (decl) = DECL_CHAIN (DECL_ARGUMENTS (decl));
14665 DECL_STATIC_FUNCTION_P (decl) = 1;
14668 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
14669 one of the language-independent trees. */
14671 enum cp_tree_node_structure_enum
14672 cp_tree_node_structure (union lang_tree_node * t)
14674 switch (TREE_CODE (&t->generic))
14676 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
14677 case DEFERRED_NOEXCEPT: return TS_CP_DEFERRED_NOEXCEPT;
14678 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
14679 case OVERLOAD: return TS_CP_OVERLOAD;
14680 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
14681 case PTRMEM_CST: return TS_CP_PTRMEM;
14682 case BASELINK: return TS_CP_BASELINK;
14683 case TEMPLATE_DECL: return TS_CP_TEMPLATE_DECL;
14684 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
14685 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
14686 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
14687 case LAMBDA_EXPR: return TS_CP_LAMBDA_EXPR;
14688 case TEMPLATE_INFO: return TS_CP_TEMPLATE_INFO;
14689 case USERDEF_LITERAL: return TS_CP_USERDEF_LITERAL;
14690 default: return TS_CP_GENERIC;
14694 /* Build the void_list_node (void_type_node having been created). */
14696 build_void_list_node (void)
14698 tree t = build_tree_list (NULL_TREE, void_type_node);
14703 cp_missing_noreturn_ok_p (tree decl)
14705 /* A missing noreturn is ok for the `main' function. */
14706 return DECL_MAIN_P (decl);
14709 /* Return the decl used to identify the COMDAT group into which DECL should
14713 cxx_comdat_group (tree decl)
14715 /* Virtual tables, construction virtual tables, and virtual table
14716 tables all go in a single COMDAT group, named after the primary
14718 if (VAR_P (decl) && DECL_VTABLE_OR_VTT_P (decl))
14719 decl = CLASSTYPE_VTABLES (DECL_CONTEXT (decl));
14720 /* For all other DECLs, the COMDAT group is the mangled name of the
14721 declaration itself. */
14724 while (DECL_THUNK_P (decl))
14726 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
14727 into the same section as the target function. In that case
14728 we must return target's name. */
14729 tree target = THUNK_TARGET (decl);
14730 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
14731 && DECL_SECTION_NAME (target) != NULL
14732 && DECL_ONE_ONLY (target))
14742 /* Returns the return type for FN as written by the user, which may include
14743 a placeholder for a deduced return type. */
14746 fndecl_declared_return_type (tree fn)
14748 fn = STRIP_TEMPLATE (fn);
14749 if (FNDECL_USED_AUTO (fn))
14751 struct language_function *f = NULL;
14752 if (DECL_STRUCT_FUNCTION (fn))
14753 f = DECL_STRUCT_FUNCTION (fn)->language;
14755 f = DECL_SAVED_FUNCTION_DATA (fn);
14756 return f->x_auto_return_pattern;
14758 return TREE_TYPE (TREE_TYPE (fn));
14761 /* Returns true iff DECL was declared with an auto return type and it has
14762 not yet been deduced to a real type. */
14765 undeduced_auto_decl (tree decl)
14767 if (cxx_dialect < cxx14)
14769 return type_uses_auto (TREE_TYPE (decl));
14772 /* Complain if DECL has an undeduced return type. */
14775 require_deduced_type (tree decl)
14777 if (undeduced_auto_decl (decl))
14778 error ("use of %qD before deduction of %<auto%>", decl);
14781 #include "gt-cp-decl.h"