1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
4 Free Software Foundation, Inc.
5 Contributed by Michael Tiemann (tiemann@cygnus.com)
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3, or (at your option)
14 GCC is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
24 /* Process declarations and symbol lookup for C++ front end.
25 Also constructs types; the standard scalar types at initialization,
26 and structure, union, array and enum types when they are declared. */
28 /* ??? not all decl nodes are given the most useful possible
29 line numbers. For example, the CONST_DECLs for enum values. */
33 #include "coretypes.h"
38 #include "tree-iterator.h"
39 #include "tree-inline.h"
47 #include "c-family/c-common.h"
48 #include "c-family/c-objc.h"
49 #include "c-family/c-pragma.h"
50 #include "diagnostic.h"
54 #include "pointer-set.h"
55 #include "splay-tree.h"
58 /* Possible cases of bad specifiers type used by bad_specifiers. */
60 BSP_VAR, /* variable */
61 BSP_PARM, /* parameter */
66 static tree grokparms (tree parmlist, tree *);
67 static const char *redeclaration_error_message (tree, tree);
69 static int decl_jump_unsafe (tree);
70 static void require_complete_types_for_parms (tree);
71 static int ambi_op_p (enum tree_code);
72 static int unary_op_p (enum tree_code);
73 static void push_local_name (tree);
74 static tree grok_reference_init (tree, tree, tree, tree *);
75 static tree grokvardecl (tree, tree, const cp_decl_specifier_seq *,
77 static void record_unknown_type (tree, const char *);
78 static tree builtin_function_1 (tree, tree, bool);
79 static tree build_library_fn_1 (tree, enum tree_code, tree);
80 static int member_function_or_else (tree, tree, enum overload_flags);
81 static void bad_specifiers (tree, enum bad_spec_place, int, int, int, int,
83 static void check_for_uninitialized_const_var (tree);
84 static hashval_t typename_hash (const void *);
85 static int typename_compare (const void *, const void *);
86 static tree local_variable_p_walkfn (tree *, int *, void *);
87 static tree record_builtin_java_type (const char *, int);
88 static const char *tag_name (enum tag_types);
89 static tree lookup_and_check_tag (enum tag_types, tree, tag_scope, bool);
90 static int walk_namespaces_r (tree, walk_namespaces_fn, void *);
91 static void maybe_deduce_size_from_array_init (tree, tree);
92 static void layout_var_decl (tree);
93 static tree check_initializer (tree, tree, int, tree *);
94 static void make_rtl_for_nonlocal_decl (tree, tree, const char *);
95 static void save_function_data (tree);
96 static void copy_type_enum (tree , tree);
97 static void check_function_type (tree, tree);
98 static void finish_constructor_body (void);
99 static void begin_destructor_body (void);
100 static void finish_destructor_body (void);
101 static void record_key_method_defined (tree);
102 static tree create_array_type_for_decl (tree, tree, tree);
103 static tree get_atexit_node (void);
104 static tree get_dso_handle_node (void);
105 static tree start_cleanup_fn (void);
106 static void end_cleanup_fn (void);
107 static tree cp_make_fname_decl (location_t, tree, int);
108 static void initialize_predefined_identifiers (void);
109 static tree check_special_function_return_type
110 (special_function_kind, tree, tree);
111 static tree push_cp_library_fn (enum tree_code, tree);
112 static tree build_cp_library_fn (tree, enum tree_code, tree);
113 static void store_parm_decls (tree);
114 static void initialize_local_var (tree, tree);
115 static void expand_static_init (tree, tree);
117 /* The following symbols are subsumed in the cp_global_trees array, and
118 listed here individually for documentation purposes.
121 tree wchar_decl_node;
123 tree vtable_entry_type;
124 tree delta_type_node;
125 tree __t_desc_type_node;
127 tree class_type_node;
128 tree unknown_type_node;
130 Array type `vtable_entry_type[]'
133 tree vtbl_ptr_type_node;
140 A FUNCTION_DECL which can call `abort'. Not necessarily the
141 one that the user will declare, but sufficient to be called
142 by routines that want to abort the program.
146 The FUNCTION_DECL for the default `::operator delete'.
148 tree global_delete_fndecl;
151 tree type_info_type_node, tinfo_decl_id, tinfo_decl_type;
152 tree tinfo_var_id; */
154 tree cp_global_trees[CPTI_MAX];
156 /* Indicates that there is a type value in some namespace, although
157 that is not necessarily in scope at the moment. */
159 tree global_type_node;
161 /* The node that holds the "name" of the global scope. */
162 tree global_scope_name;
164 #define local_names cp_function_chain->x_local_names
166 /* A list of objects which have constructors or destructors
167 which reside in the global scope. The decl is stored in
168 the TREE_VALUE slot and the initializer is stored
169 in the TREE_PURPOSE slot. */
170 tree static_aggregates;
174 /* A node for the integer constant 2. */
176 tree integer_two_node;
178 /* Used only for jumps to as-yet undefined labels, since jumps to
179 defined labels can have their validity checked immediately. */
181 struct GTY((chain_next ("%h.next"))) named_label_use_entry {
182 struct named_label_use_entry *next;
183 /* The binding level to which this entry is *currently* attached.
184 This is initially the binding level in which the goto appeared,
185 but is modified as scopes are closed. */
186 struct cp_binding_level *binding_level;
187 /* The head of the names list that was current when the goto appeared,
188 or the inner scope popped. These are the decls that will *not* be
189 skipped when jumping to the label. */
191 /* The location of the goto, for error reporting. */
192 location_t o_goto_locus;
193 /* True if an OpenMP structured block scope has been closed since
194 the goto appeared. This means that the branch from the label will
195 illegally exit an OpenMP scope. */
199 /* A list of all LABEL_DECLs in the function that have names. Here so
200 we can clear out their names' definitions at the end of the
201 function, and so we can check the validity of jumps to these labels. */
203 struct GTY(()) named_label_entry {
204 /* The decl itself. */
207 /* The binding level to which the label is *currently* attached.
208 This is initially set to the binding level in which the label
209 is defined, but is modified as scopes are closed. */
210 struct cp_binding_level *binding_level;
211 /* The head of the names list that was current when the label was
212 defined, or the inner scope popped. These are the decls that will
213 be skipped when jumping to the label. */
215 /* A vector of all decls from all binding levels that would be
216 crossed by a backward branch to the label. */
217 VEC(tree,gc) *bad_decls;
219 /* A list of uses of the label, before the label is defined. */
220 struct named_label_use_entry *uses;
222 /* The following bits are set after the label is defined, and are
223 updated as scopes are popped. They indicate that a backward jump
224 to the label will illegally enter a scope of the given flavor. */
230 #define named_labels cp_function_chain->x_named_labels
232 /* The number of function bodies which we are currently processing.
233 (Zero if we are at namespace scope, one inside the body of a
234 function, two inside the body of a function in a local class, etc.) */
237 /* To avoid unwanted recursion, finish_function defers all mark_used calls
238 encountered during its execution until it finishes. */
239 bool defer_mark_used_calls;
240 VEC(tree, gc) *deferred_mark_used_calls;
242 /* States indicating how grokdeclarator() should handle declspecs marked
243 with __attribute__((deprecated)). An object declared as
244 __attribute__((deprecated)) suppresses warnings of uses of other
246 enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
249 /* A list of VAR_DECLs whose type was incomplete at the time the
250 variable was declared. */
252 typedef struct GTY(()) incomplete_var_d {
254 tree incomplete_type;
257 DEF_VEC_O(incomplete_var);
258 DEF_VEC_ALLOC_O(incomplete_var,gc);
260 static GTY(()) VEC(incomplete_var,gc) *incomplete_vars;
262 /* Returns the kind of template specialization we are currently
263 processing, given that it's declaration contained N_CLASS_SCOPES
264 explicit scope qualifications. */
267 current_tmpl_spec_kind (int n_class_scopes)
269 int n_template_parm_scopes = 0;
270 int seen_specialization_p = 0;
271 int innermost_specialization_p = 0;
272 struct cp_binding_level *b;
274 /* Scan through the template parameter scopes. */
275 for (b = current_binding_level;
276 b->kind == sk_template_parms;
279 /* If we see a specialization scope inside a parameter scope,
280 then something is wrong. That corresponds to a declaration
283 template <class T> template <> ...
285 which is always invalid since [temp.expl.spec] forbids the
286 specialization of a class member template if the enclosing
287 class templates are not explicitly specialized as well. */
288 if (b->explicit_spec_p)
290 if (n_template_parm_scopes == 0)
291 innermost_specialization_p = 1;
293 seen_specialization_p = 1;
295 else if (seen_specialization_p == 1)
296 return tsk_invalid_member_spec;
298 ++n_template_parm_scopes;
301 /* Handle explicit instantiations. */
302 if (processing_explicit_instantiation)
304 if (n_template_parm_scopes != 0)
305 /* We've seen a template parameter list during an explicit
306 instantiation. For example:
308 template <class T> template void f(int);
310 This is erroneous. */
311 return tsk_invalid_expl_inst;
313 return tsk_expl_inst;
316 if (n_template_parm_scopes < n_class_scopes)
317 /* We've not seen enough template headers to match all the
318 specialized classes present. For example:
320 template <class T> void R<T>::S<T>::f(int);
322 This is invalid; there needs to be one set of template
323 parameters for each class. */
324 return tsk_insufficient_parms;
325 else if (n_template_parm_scopes == n_class_scopes)
326 /* We're processing a non-template declaration (even though it may
327 be a member of a template class.) For example:
329 template <class T> void S<T>::f(int);
331 The `class T' matches the `S<T>', leaving no template headers
332 corresponding to the `f'. */
334 else if (n_template_parm_scopes > n_class_scopes + 1)
335 /* We've got too many template headers. For example:
337 template <> template <class T> void f (T);
339 There need to be more enclosing classes. */
340 return tsk_excessive_parms;
342 /* This must be a template. It's of the form:
344 template <class T> template <class U> void S<T>::f(U);
346 This is a specialization if the innermost level was a
347 specialization; otherwise it's just a definition of the
349 return innermost_specialization_p ? tsk_expl_spec : tsk_template;
352 /* Exit the current scope. */
360 /* When a label goes out of scope, check to see if that label was used
361 in a valid manner, and issue any appropriate warnings or errors. */
364 pop_label (tree label, tree old_value)
366 if (!processing_template_decl)
368 if (DECL_INITIAL (label) == NULL_TREE)
372 error ("label %q+D used but not defined", label);
373 location = input_location; /* FIXME want (input_filename, (line)0) */
374 /* Avoid crashing later. */
375 define_label (location, DECL_NAME (label));
378 warn_for_unused_label (label);
381 SET_IDENTIFIER_LABEL_VALUE (DECL_NAME (label), old_value);
384 /* At the end of a function, all labels declared within the function
385 go out of scope. BLOCK is the top-level block for the
389 pop_labels_1 (void **slot, void *data)
391 struct named_label_entry *ent = (struct named_label_entry *) *slot;
392 tree block = (tree) data;
394 pop_label (ent->label_decl, NULL_TREE);
396 /* Put the labels into the "variables" of the top-level block,
397 so debugger can see them. */
398 DECL_CHAIN (ent->label_decl) = BLOCK_VARS (block);
399 BLOCK_VARS (block) = ent->label_decl;
401 htab_clear_slot (named_labels, slot);
407 pop_labels (tree block)
411 htab_traverse (named_labels, pop_labels_1, block);
416 /* At the end of a block with local labels, restore the outer definition. */
419 pop_local_label (tree label, tree old_value)
421 struct named_label_entry dummy;
424 pop_label (label, old_value);
426 dummy.label_decl = label;
427 slot = htab_find_slot (named_labels, &dummy, NO_INSERT);
428 htab_clear_slot (named_labels, slot);
431 /* The following two routines are used to interface to Objective-C++.
432 The binding level is purposely treated as an opaque type. */
435 objc_get_current_scope (void)
437 return current_binding_level;
440 /* The following routine is used by the NeXT-style SJLJ exceptions;
441 variables get marked 'volatile' so as to not be clobbered by
442 _setjmp()/_longjmp() calls. All variables in the current scope,
443 as well as parent scopes up to (but not including) ENCLOSING_BLK
444 shall be thusly marked. */
447 objc_mark_locals_volatile (void *enclosing_blk)
449 struct cp_binding_level *scope;
451 for (scope = current_binding_level;
452 scope && scope != enclosing_blk;
453 scope = scope->level_chain)
457 for (decl = scope->names; decl; decl = TREE_CHAIN (decl))
458 objc_volatilize_decl (decl);
460 /* Do not climb up past the current function. */
461 if (scope->kind == sk_function_parms)
466 /* Update data for defined and undefined labels when leaving a scope. */
469 poplevel_named_label_1 (void **slot, void *data)
471 struct named_label_entry *ent = (struct named_label_entry *) *slot;
472 struct cp_binding_level *bl = (struct cp_binding_level *) data;
473 struct cp_binding_level *obl = bl->level_chain;
475 if (ent->binding_level == bl)
479 /* ENT->NAMES_IN_SCOPE may contain a mixture of DECLs and
480 TREE_LISTs representing OVERLOADs, so be careful. */
481 for (decl = ent->names_in_scope; decl; decl = (DECL_P (decl)
483 : TREE_CHAIN (decl)))
484 if (decl_jump_unsafe (decl))
485 VEC_safe_push (tree, gc, ent->bad_decls, decl);
487 ent->binding_level = obl;
488 ent->names_in_scope = obl->names;
492 ent->in_try_scope = true;
495 ent->in_catch_scope = true;
498 ent->in_omp_scope = true;
506 struct named_label_use_entry *use;
508 for (use = ent->uses; use ; use = use->next)
509 if (use->binding_level == bl)
511 use->binding_level = obl;
512 use->names_in_scope = obl->names;
513 if (bl->kind == sk_omp)
514 use->in_omp_scope = true;
521 /* Saved errorcount to avoid -Wunused-but-set-{parameter,variable} warnings
522 when errors were reported, except for -Werror-unused-but-set-*. */
523 static int unused_but_set_errorcount;
525 /* Exit a binding level.
526 Pop the level off, and restore the state of the identifier-decl mappings
527 that were in effect when this level was entered.
529 If KEEP == 1, this level had explicit declarations, so
530 and create a "block" (a BLOCK node) for the level
531 to record its declarations and subblocks for symbol table output.
533 If FUNCTIONBODY is nonzero, this level is the body of a function,
534 so create a block as if KEEP were set and also clear out all
537 If REVERSE is nonzero, reverse the order of decls before putting
538 them into the BLOCK. */
541 poplevel (int keep, int reverse, int functionbody)
544 /* The chain of decls was accumulated in reverse order.
545 Put it into forward order, just for cleanliness. */
550 int leaving_for_scope;
553 cp_label_binding *label_bind;
555 timevar_push (TV_NAME_LOOKUP);
560 gcc_assert (current_binding_level->kind != sk_class);
562 if (current_binding_level->kind == sk_cleanup)
564 subblocks = functionbody >= 0 ? current_binding_level->blocks : 0;
566 gcc_assert (!VEC_length(cp_class_binding,
567 current_binding_level->class_shadowed));
569 /* We used to use KEEP == 2 to indicate that the new block should go
570 at the beginning of the list of blocks at this binding level,
571 rather than the end. This hack is no longer used. */
572 gcc_assert (keep == 0 || keep == 1);
574 if (current_binding_level->keep)
577 /* Any uses of undefined labels, and any defined labels, now operate
578 under constraints of next binding contour. */
579 if (cfun && !functionbody && named_labels)
580 htab_traverse (named_labels, poplevel_named_label_1,
581 current_binding_level);
583 /* Get the decls in the order they were written.
584 Usually current_binding_level->names is in reverse order.
585 But parameter decls were previously put in forward order. */
588 current_binding_level->names
589 = decls = nreverse (current_binding_level->names);
591 decls = current_binding_level->names;
593 /* If there were any declarations or structure tags in that level,
594 or if this level is a function body,
595 create a BLOCK to record them for the life of this function. */
597 if (keep == 1 || functionbody)
598 block = make_node (BLOCK);
599 if (block != NULL_TREE)
601 BLOCK_VARS (block) = decls;
602 BLOCK_SUBBLOCKS (block) = subblocks;
605 /* In each subblock, record that this is its superior. */
607 for (link = subblocks; link; link = BLOCK_CHAIN (link))
608 BLOCK_SUPERCONTEXT (link) = block;
610 /* We still support the old for-scope rules, whereby the variables
611 in a for-init statement were in scope after the for-statement
612 ended. We only use the new rules if flag_new_for_scope is
615 = current_binding_level->kind == sk_for && flag_new_for_scope == 1;
617 /* Before we remove the declarations first check for unused variables. */
618 if ((warn_unused_variable || warn_unused_but_set_variable)
619 && !processing_template_decl)
620 for (decl = getdecls (); decl; decl = TREE_CHAIN (decl))
621 if (TREE_CODE (decl) == VAR_DECL
622 && (! TREE_USED (decl) || !DECL_READ_P (decl))
623 && ! DECL_IN_SYSTEM_HEADER (decl)
624 && DECL_NAME (decl) && ! DECL_ARTIFICIAL (decl))
626 if (! TREE_USED (decl))
627 warning (OPT_Wunused_variable, "unused variable %q+D", decl);
628 else if (DECL_CONTEXT (decl) == current_function_decl
629 && TREE_TYPE (decl) != error_mark_node
630 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
631 && errorcount == unused_but_set_errorcount
632 && (!CLASS_TYPE_P (TREE_TYPE (decl))
633 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
635 warning (OPT_Wunused_but_set_variable,
636 "variable %q+D set but not used", decl);
637 unused_but_set_errorcount = errorcount;
641 /* Remove declarations for all the DECLs in this level. */
642 for (link = decls; link; link = TREE_CHAIN (link))
644 if (leaving_for_scope && TREE_CODE (link) == VAR_DECL
647 tree name = DECL_NAME (link);
651 ob = outer_binding (name,
652 IDENTIFIER_BINDING (name),
655 ns_binding = IDENTIFIER_NAMESPACE_VALUE (name);
657 ns_binding = NULL_TREE;
659 if (ob && ob->scope == current_binding_level->level_chain)
660 /* We have something like:
665 and we are leaving the `for' scope. There's no reason to
666 keep the binding of the inner `i' in this case. */
667 pop_binding (name, link);
668 else if ((ob && (TREE_CODE (ob->value) == TYPE_DECL))
669 || (ns_binding && TREE_CODE (ns_binding) == TYPE_DECL))
670 /* Here, we have something like:
678 We must pop the for-scope binding so we know what's a
679 type and what isn't. */
680 pop_binding (name, link);
683 /* Mark this VAR_DECL as dead so that we can tell we left it
684 there only for backward compatibility. */
685 DECL_DEAD_FOR_LOCAL (link) = 1;
687 /* Keep track of what should have happened when we
688 popped the binding. */
691 SET_DECL_SHADOWED_FOR_VAR (link, ob->value);
692 DECL_HAS_SHADOWED_FOR_VAR_P (link) = 1;
695 /* Add it to the list of dead variables in the next
696 outermost binding to that we can remove these when we
697 leave that binding. */
698 VEC_safe_push (tree, gc,
699 current_binding_level->level_chain->dead_vars_from_for,
702 /* Although we don't pop the cxx_binding, we do clear
703 its SCOPE since the scope is going away now. */
704 IDENTIFIER_BINDING (name)->scope
705 = current_binding_level->level_chain;
712 /* Remove the binding. */
715 if (TREE_CODE (decl) == TREE_LIST)
716 decl = TREE_VALUE (decl);
719 if (TREE_CODE (name) == OVERLOAD)
720 name = OVL_FUNCTION (name);
722 gcc_assert (DECL_P (name));
723 pop_binding (DECL_NAME (name), decl);
727 /* Remove declarations for any `for' variables from inner scopes
728 that we kept around. */
729 FOR_EACH_VEC_ELT_REVERSE (tree, current_binding_level->dead_vars_from_for,
731 pop_binding (DECL_NAME (decl), decl);
733 /* Restore the IDENTIFIER_TYPE_VALUEs. */
734 for (link = current_binding_level->type_shadowed;
735 link; link = TREE_CHAIN (link))
736 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (link), TREE_VALUE (link));
738 /* Restore the IDENTIFIER_LABEL_VALUEs for local labels. */
739 FOR_EACH_VEC_ELT_REVERSE (cp_label_binding,
740 current_binding_level->shadowed_labels,
742 pop_local_label (label_bind->label, label_bind->prev_value);
744 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
745 list if a `using' declaration put them there. The debugging
746 back ends won't understand OVERLOAD, so we remove them here.
747 Because the BLOCK_VARS are (temporarily) shared with
748 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
749 popped all the bindings. */
754 for (d = &BLOCK_VARS (block); *d; )
756 if (TREE_CODE (*d) == TREE_LIST)
757 *d = TREE_CHAIN (*d);
759 d = &DECL_CHAIN (*d);
763 /* If the level being exited is the top level of a function,
764 check over all the labels. */
767 /* Since this is the top level block of a function, the vars are
768 the function's parameters. Don't leave them in the BLOCK
769 because they are found in the FUNCTION_DECL instead. */
770 BLOCK_VARS (block) = 0;
774 kind = current_binding_level->kind;
775 if (kind == sk_cleanup)
779 /* If this is a temporary binding created for a cleanup, then we'll
780 have pushed a statement list level. Pop that, create a new
781 BIND_EXPR for the block, and insert it into the stream. */
782 stmt = pop_stmt_list (current_binding_level->statement_list);
783 stmt = c_build_bind_expr (input_location, block, stmt);
790 /* The current function is being defined, so its DECL_INITIAL
791 should be error_mark_node. */
792 gcc_assert (DECL_INITIAL (current_function_decl) == error_mark_node);
793 DECL_INITIAL (current_function_decl) = block;
796 current_binding_level->blocks
797 = block_chainon (current_binding_level->blocks, block);
799 /* If we did not make a block for the level just exited,
800 any blocks made for inner levels
801 (since they cannot be recorded as subblocks in that level)
802 must be carried forward so they will later become subblocks
803 of something else. */
805 current_binding_level->blocks
806 = block_chainon (current_binding_level->blocks, subblocks);
808 /* Each and every BLOCK node created here in `poplevel' is important
809 (e.g. for proper debugging information) so if we created one
810 earlier, mark it as "used". */
812 TREE_USED (block) = 1;
814 /* All temporary bindings created for cleanups are popped silently. */
815 if (kind == sk_cleanup)
818 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, block);
821 /* Walk all the namespaces contained NAMESPACE, including NAMESPACE
822 itself, calling F for each. The DATA is passed to F as well. */
825 walk_namespaces_r (tree name_space, walk_namespaces_fn f, void* data)
828 tree current = NAMESPACE_LEVEL (name_space)->namespaces;
830 result |= (*f) (name_space, data);
832 for (; current; current = DECL_CHAIN (current))
833 result |= walk_namespaces_r (current, f, data);
838 /* Walk all the namespaces, calling F for each. The DATA is passed to
842 walk_namespaces (walk_namespaces_fn f, void* data)
844 return walk_namespaces_r (global_namespace, f, data);
847 /* Call wrapup_globals_declarations for the globals in NAMESPACE. If
848 DATA is non-NULL, this is the last time we will call
849 wrapup_global_declarations for this NAMESPACE. */
852 wrapup_globals_for_namespace (tree name_space, void* data)
854 struct cp_binding_level *level = NAMESPACE_LEVEL (name_space);
855 VEC(tree,gc) *statics = level->static_decls;
856 tree *vec = VEC_address (tree, statics);
857 int len = VEC_length (tree, statics);
858 int last_time = (data != 0);
862 check_global_declarations (vec, len);
863 emit_debug_global_declarations (vec, len);
867 /* Write out any globals that need to be output. */
868 return wrapup_global_declarations (vec, len);
872 /* In C++, you don't have to write `struct S' to refer to `S'; you
873 can just use `S'. We accomplish this by creating a TYPE_DECL as
874 if the user had written `typedef struct S S'. Create and return
875 the TYPE_DECL for TYPE. */
878 create_implicit_typedef (tree name, tree type)
882 decl = build_decl (input_location, TYPE_DECL, name, type);
883 DECL_ARTIFICIAL (decl) = 1;
884 /* There are other implicit type declarations, like the one *within*
885 a class that allows you to write `S::S'. We must distinguish
887 SET_DECL_IMPLICIT_TYPEDEF_P (decl);
888 TYPE_NAME (type) = decl;
889 TYPE_STUB_DECL (type) = decl;
894 /* Remember a local name for name-mangling purposes. */
897 push_local_name (tree decl)
902 timevar_push (TV_NAME_LOOKUP);
904 name = DECL_NAME (decl);
906 nelts = VEC_length (tree, local_names);
907 for (i = 0; i < nelts; i++)
909 t = VEC_index (tree, local_names, i);
910 if (DECL_NAME (t) == name)
912 if (!DECL_LANG_SPECIFIC (decl))
913 retrofit_lang_decl (decl);
914 DECL_LANG_SPECIFIC (decl)->u.base.u2sel = 1;
915 if (DECL_LANG_SPECIFIC (t))
916 DECL_DISCRIMINATOR (decl) = DECL_DISCRIMINATOR (t) + 1;
918 DECL_DISCRIMINATOR (decl) = 1;
920 VEC_replace (tree, local_names, i, decl);
921 timevar_pop (TV_NAME_LOOKUP);
926 VEC_safe_push (tree, gc, local_names, decl);
927 timevar_pop (TV_NAME_LOOKUP);
930 /* Subroutine of duplicate_decls: return truthvalue of whether
931 or not types of these decls match.
933 For C++, we must compare the parameter list so that `int' can match
934 `int&' in a parameter position, but `int&' is not confused with
938 decls_match (tree newdecl, tree olddecl)
942 if (newdecl == olddecl)
945 if (TREE_CODE (newdecl) != TREE_CODE (olddecl))
946 /* If the two DECLs are not even the same kind of thing, we're not
947 interested in their types. */
950 if (TREE_CODE (newdecl) == FUNCTION_DECL)
952 tree f1 = TREE_TYPE (newdecl);
953 tree f2 = TREE_TYPE (olddecl);
954 tree p1 = TYPE_ARG_TYPES (f1);
955 tree p2 = TYPE_ARG_TYPES (f2);
957 /* Specializations of different templates are different functions
958 even if they have the same type. */
959 tree t1 = (DECL_USE_TEMPLATE (newdecl)
960 ? DECL_TI_TEMPLATE (newdecl)
962 tree t2 = (DECL_USE_TEMPLATE (olddecl)
963 ? DECL_TI_TEMPLATE (olddecl)
968 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
969 && ! (DECL_EXTERN_C_P (newdecl)
970 && DECL_EXTERN_C_P (olddecl)))
973 #ifdef NO_IMPLICIT_EXTERN_C
974 /* A new declaration doesn't match a built-in one unless it
975 is also extern "C". */
976 if (DECL_IS_BUILTIN (olddecl)
977 && DECL_EXTERN_C_P (olddecl) && !DECL_EXTERN_C_P (newdecl))
981 if (TREE_CODE (f1) != TREE_CODE (f2))
984 if (same_type_p (TREE_TYPE (f1), TREE_TYPE (f2)))
986 if (!prototype_p (f2) && DECL_EXTERN_C_P (olddecl)
987 && (DECL_BUILT_IN (olddecl)
988 #ifndef NO_IMPLICIT_EXTERN_C
989 || (DECL_IN_SYSTEM_HEADER (newdecl) && !DECL_CLASS_SCOPE_P (newdecl))
990 || (DECL_IN_SYSTEM_HEADER (olddecl) && !DECL_CLASS_SCOPE_P (olddecl))
994 types_match = self_promoting_args_p (p1);
995 if (p1 == void_list_node)
996 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
998 #ifndef NO_IMPLICIT_EXTERN_C
999 else if (!prototype_p (f1)
1000 && (DECL_EXTERN_C_P (olddecl)
1001 && DECL_IN_SYSTEM_HEADER (olddecl)
1002 && !DECL_CLASS_SCOPE_P (olddecl))
1003 && (DECL_EXTERN_C_P (newdecl)
1004 && DECL_IN_SYSTEM_HEADER (newdecl)
1005 && !DECL_CLASS_SCOPE_P (newdecl)))
1007 types_match = self_promoting_args_p (p2);
1008 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
1014 && (TYPE_ATTRIBUTES (TREE_TYPE (newdecl)) == NULL_TREE
1015 || comp_type_attributes (TREE_TYPE (newdecl),
1016 TREE_TYPE (olddecl)) != 0);
1021 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1023 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl))
1024 != TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)))
1027 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1028 DECL_TEMPLATE_PARMS (olddecl)))
1031 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1032 types_match = same_type_p (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl)),
1033 TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl)));
1035 types_match = decls_match (DECL_TEMPLATE_RESULT (olddecl),
1036 DECL_TEMPLATE_RESULT (newdecl));
1040 /* Need to check scope for variable declaration (VAR_DECL).
1041 For typedef (TYPE_DECL), scope is ignored. */
1042 if (TREE_CODE (newdecl) == VAR_DECL
1043 && CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
1045 Two declarations for an object with C language linkage
1046 with the same name (ignoring the namespace that qualify
1047 it) that appear in different namespace scopes refer to
1049 && !(DECL_EXTERN_C_P (olddecl) && DECL_EXTERN_C_P (newdecl)))
1052 if (TREE_TYPE (newdecl) == error_mark_node)
1053 types_match = TREE_TYPE (olddecl) == error_mark_node;
1054 else if (TREE_TYPE (olddecl) == NULL_TREE)
1055 types_match = TREE_TYPE (newdecl) == NULL_TREE;
1056 else if (TREE_TYPE (newdecl) == NULL_TREE)
1059 types_match = comptypes (TREE_TYPE (newdecl),
1060 TREE_TYPE (olddecl),
1061 COMPARE_REDECLARATION);
1067 /* If NEWDECL is `static' and an `extern' was seen previously,
1068 warn about it. OLDDECL is the previous declaration.
1070 Note that this does not apply to the C++ case of declaring
1071 a variable `extern const' and then later `const'.
1073 Don't complain about built-in functions, since they are beyond
1074 the user's control. */
1077 warn_extern_redeclared_static (tree newdecl, tree olddecl)
1079 if (TREE_CODE (newdecl) == TYPE_DECL
1080 || TREE_CODE (newdecl) == TEMPLATE_DECL
1081 || TREE_CODE (newdecl) == CONST_DECL
1082 || TREE_CODE (newdecl) == NAMESPACE_DECL)
1085 /* Don't get confused by static member functions; that's a different
1087 if (TREE_CODE (newdecl) == FUNCTION_DECL
1088 && DECL_STATIC_FUNCTION_P (newdecl))
1091 /* If the old declaration was `static', or the new one isn't, then
1092 everything is OK. */
1093 if (DECL_THIS_STATIC (olddecl) || !DECL_THIS_STATIC (newdecl))
1096 /* It's OK to declare a builtin function as `static'. */
1097 if (TREE_CODE (olddecl) == FUNCTION_DECL
1098 && DECL_ARTIFICIAL (olddecl))
1101 permerror (input_location, "%qD was declared %<extern%> and later %<static%>", newdecl);
1102 permerror (input_location, "previous declaration of %q+D", olddecl);
1105 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1106 function templates. If their exception specifications do not
1107 match, issue a diagnostic. */
1110 check_redeclaration_exception_specification (tree new_decl,
1115 tree new_exceptions;
1116 tree old_exceptions;
1118 new_type = TREE_TYPE (new_decl);
1119 new_exceptions = TYPE_RAISES_EXCEPTIONS (new_type);
1120 old_type = TREE_TYPE (old_decl);
1121 old_exceptions = TYPE_RAISES_EXCEPTIONS (old_type);
1125 If any declaration of a function has an exception-specification,
1126 all declarations, including the definition and an explicit
1127 specialization, of that function shall have an
1128 exception-specification with the same set of type-ids. */
1129 if ((pedantic || ! DECL_IN_SYSTEM_HEADER (old_decl))
1130 && ! DECL_IS_BUILTIN (old_decl)
1132 && !comp_except_specs (new_exceptions, old_exceptions, ce_normal))
1134 error ("declaration of %qF has a different exception specifier",
1136 error ("from previous declaration %q+F", old_decl);
1140 /* Return true if OLD_DECL and NEW_DECL agree on constexprness.
1141 Otherwise issue diagnostics. */
1144 validate_constexpr_redeclaration (tree old_decl, tree new_decl)
1146 old_decl = STRIP_TEMPLATE (old_decl);
1147 new_decl = STRIP_TEMPLATE (new_decl);
1148 if (!VAR_OR_FUNCTION_DECL_P (old_decl)
1149 || !VAR_OR_FUNCTION_DECL_P (new_decl))
1151 if (DECL_DECLARED_CONSTEXPR_P (old_decl)
1152 == DECL_DECLARED_CONSTEXPR_P (new_decl))
1154 if (TREE_CODE (old_decl) == FUNCTION_DECL && DECL_BUILT_IN (old_decl))
1156 /* Hide a built-in declaration. */
1157 DECL_DECLARED_CONSTEXPR_P (old_decl)
1158 = DECL_DECLARED_CONSTEXPR_P (new_decl);
1161 error ("redeclaration %qD differs in %<constexpr%>", new_decl);
1162 error ("from previous declaration %q+D", old_decl);
1166 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1167 && lookup_attribute ("gnu_inline", \
1168 DECL_ATTRIBUTES (fn)))
1170 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1171 If the redeclaration is invalid, a diagnostic is issued, and the
1172 error_mark_node is returned. Otherwise, OLDDECL is returned.
1174 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1177 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1180 duplicate_decls (tree newdecl, tree olddecl, bool newdecl_is_friend)
1182 unsigned olddecl_uid = DECL_UID (olddecl);
1183 int olddecl_friend = 0, types_match = 0, hidden_friend = 0;
1184 int new_defines_function = 0;
1185 tree new_template_info;
1187 if (newdecl == olddecl)
1190 types_match = decls_match (newdecl, olddecl);
1192 /* If either the type of the new decl or the type of the old decl is an
1193 error_mark_node, then that implies that we have already issued an
1194 error (earlier) for some bogus type specification, and in that case,
1195 it is rather pointless to harass the user with yet more error message
1196 about the same declaration, so just pretend the types match here. */
1197 if (TREE_TYPE (newdecl) == error_mark_node
1198 || TREE_TYPE (olddecl) == error_mark_node)
1199 return error_mark_node;
1201 if (DECL_P (olddecl)
1202 && TREE_CODE (newdecl) == FUNCTION_DECL
1203 && TREE_CODE (olddecl) == FUNCTION_DECL
1204 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1206 if (DECL_DECLARED_INLINE_P (newdecl)
1207 && DECL_UNINLINABLE (newdecl)
1208 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1209 /* Already warned elsewhere. */;
1210 else if (DECL_DECLARED_INLINE_P (olddecl)
1211 && DECL_UNINLINABLE (olddecl)
1212 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1213 /* Already warned. */;
1214 else if (DECL_DECLARED_INLINE_P (newdecl)
1215 && DECL_UNINLINABLE (olddecl)
1216 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1218 warning (OPT_Wattributes, "function %q+D redeclared as inline",
1220 warning (OPT_Wattributes, "previous declaration of %q+D "
1221 "with attribute noinline", olddecl);
1223 else if (DECL_DECLARED_INLINE_P (olddecl)
1224 && DECL_UNINLINABLE (newdecl)
1225 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1227 warning (OPT_Wattributes, "function %q+D redeclared with "
1228 "attribute noinline", newdecl);
1229 warning (OPT_Wattributes, "previous declaration of %q+D was inline",
1234 /* Check for redeclaration and other discrepancies. */
1235 if (TREE_CODE (olddecl) == FUNCTION_DECL
1236 && DECL_ARTIFICIAL (olddecl))
1238 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl));
1239 if (TREE_CODE (newdecl) != FUNCTION_DECL)
1241 /* Avoid warnings redeclaring built-ins which have not been
1242 explicitly declared. */
1243 if (DECL_ANTICIPATED (olddecl))
1246 /* If you declare a built-in or predefined function name as static,
1247 the old definition is overridden, but optionally warn this was a
1248 bad choice of name. */
1249 if (! TREE_PUBLIC (newdecl))
1251 warning (OPT_Wshadow,
1252 DECL_BUILT_IN (olddecl)
1253 ? G_("shadowing built-in function %q#D")
1254 : G_("shadowing library function %q#D"), olddecl);
1255 /* Discard the old built-in function. */
1258 /* If the built-in is not ansi, then programs can override
1259 it even globally without an error. */
1260 else if (! DECL_BUILT_IN (olddecl))
1261 warning (0, "library function %q#D redeclared as non-function %q#D",
1265 error ("declaration of %q#D", newdecl);
1266 error ("conflicts with built-in declaration %q#D",
1271 else if (!types_match)
1273 /* Avoid warnings redeclaring built-ins which have not been
1274 explicitly declared. */
1275 if (DECL_ANTICIPATED (olddecl))
1277 /* Deal with fileptr_type_node. FILE type is not known
1278 at the time we create the builtins. */
1281 for (t1 = TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1282 t2 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1284 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1287 else if (TREE_VALUE (t2) == fileptr_type_node)
1289 tree t = TREE_VALUE (t1);
1291 if (TREE_CODE (t) == POINTER_TYPE
1292 && TYPE_NAME (TREE_TYPE (t))
1293 && DECL_NAME (TYPE_NAME (TREE_TYPE (t)))
1294 == get_identifier ("FILE")
1295 && compparms (TREE_CHAIN (t1), TREE_CHAIN (t2)))
1297 tree oldargs = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1299 TYPE_ARG_TYPES (TREE_TYPE (olddecl))
1300 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1301 types_match = decls_match (newdecl, olddecl);
1303 return duplicate_decls (newdecl, olddecl,
1305 TYPE_ARG_TYPES (TREE_TYPE (olddecl)) = oldargs;
1308 else if (! same_type_p (TREE_VALUE (t1), TREE_VALUE (t2)))
1311 else if ((DECL_EXTERN_C_P (newdecl)
1312 && DECL_EXTERN_C_P (olddecl))
1313 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1314 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1316 /* A near match; override the builtin. */
1318 if (TREE_PUBLIC (newdecl))
1320 warning (0, "new declaration %q#D", newdecl);
1321 warning (0, "ambiguates built-in declaration %q#D",
1325 warning (OPT_Wshadow,
1326 DECL_BUILT_IN (olddecl)
1327 ? G_("shadowing built-in function %q#D")
1328 : G_("shadowing library function %q#D"), olddecl);
1331 /* Discard the old built-in function. */
1334 /* Replace the old RTL to avoid problems with inlining. */
1335 COPY_DECL_RTL (newdecl, olddecl);
1337 /* Even if the types match, prefer the new declarations type for
1338 built-ins which have not been explicitly declared, for
1339 exception lists, etc... */
1340 else if (DECL_IS_BUILTIN (olddecl))
1342 tree type = TREE_TYPE (newdecl);
1343 tree attribs = (*targetm.merge_type_attributes)
1344 (TREE_TYPE (olddecl), type);
1346 type = cp_build_type_attribute_variant (type, attribs);
1347 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = type;
1350 /* If a function is explicitly declared "throw ()", propagate that to
1351 the corresponding builtin. */
1352 if (DECL_BUILT_IN_CLASS (olddecl) == BUILT_IN_NORMAL
1353 && DECL_ANTICIPATED (olddecl)
1354 && TREE_NOTHROW (newdecl)
1355 && !TREE_NOTHROW (olddecl)
1356 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != NULL_TREE
1357 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != olddecl
1359 TREE_NOTHROW (built_in_decls [DECL_FUNCTION_CODE (olddecl)]) = 1;
1361 /* Whether or not the builtin can throw exceptions has no
1362 bearing on this declarator. */
1363 TREE_NOTHROW (olddecl) = 0;
1365 if (DECL_THIS_STATIC (newdecl) && !DECL_THIS_STATIC (olddecl))
1367 /* If a builtin function is redeclared as `static', merge
1368 the declarations, but make the original one static. */
1369 DECL_THIS_STATIC (olddecl) = 1;
1370 TREE_PUBLIC (olddecl) = 0;
1372 /* Make the old declaration consistent with the new one so
1373 that all remnants of the builtin-ness of this function
1374 will be banished. */
1375 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1376 COPY_DECL_RTL (newdecl, olddecl);
1379 else if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1381 /* C++ Standard, 3.3, clause 4:
1382 "[Note: a namespace name or a class template name must be unique
1383 in its declarative region (7.3.2, clause 14). ]" */
1384 if (TREE_CODE (olddecl) != NAMESPACE_DECL
1385 && TREE_CODE (newdecl) != NAMESPACE_DECL
1386 && (TREE_CODE (olddecl) != TEMPLATE_DECL
1387 || TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) != TYPE_DECL)
1388 && (TREE_CODE (newdecl) != TEMPLATE_DECL
1389 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != TYPE_DECL))
1391 if ((TREE_CODE (olddecl) == TYPE_DECL && DECL_ARTIFICIAL (olddecl)
1392 && TREE_CODE (newdecl) != TYPE_DECL)
1393 || (TREE_CODE (newdecl) == TYPE_DECL && DECL_ARTIFICIAL (newdecl)
1394 && TREE_CODE (olddecl) != TYPE_DECL))
1396 /* We do nothing special here, because C++ does such nasty
1397 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1398 get shadowed, and know that if we need to find a TYPE_DECL
1399 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1400 slot of the identifier. */
1404 if ((TREE_CODE (newdecl) == FUNCTION_DECL
1405 && DECL_FUNCTION_TEMPLATE_P (olddecl))
1406 || (TREE_CODE (olddecl) == FUNCTION_DECL
1407 && DECL_FUNCTION_TEMPLATE_P (newdecl)))
1411 error ("%q#D redeclared as different kind of symbol", newdecl);
1412 if (TREE_CODE (olddecl) == TREE_LIST)
1413 olddecl = TREE_VALUE (olddecl);
1414 error ("previous declaration of %q+#D", olddecl);
1416 return error_mark_node;
1418 else if (!types_match)
1420 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
1421 /* These are certainly not duplicate declarations; they're
1422 from different scopes. */
1425 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1427 /* The name of a class template may not be declared to refer to
1428 any other template, class, function, object, namespace, value,
1429 or type in the same scope. */
1430 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == TYPE_DECL
1431 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1433 error ("declaration of template %q#D", newdecl);
1434 error ("conflicts with previous declaration %q+#D", olddecl);
1436 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == FUNCTION_DECL
1437 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == FUNCTION_DECL
1438 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl))),
1439 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl))))
1440 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1441 DECL_TEMPLATE_PARMS (olddecl))
1442 /* Template functions can be disambiguated by
1444 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl)),
1445 TREE_TYPE (TREE_TYPE (olddecl))))
1447 error ("new declaration %q#D", newdecl);
1448 error ("ambiguates old declaration %q+#D", olddecl);
1452 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1454 if (DECL_EXTERN_C_P (newdecl) && DECL_EXTERN_C_P (olddecl))
1456 error ("declaration of C function %q#D conflicts with",
1458 error ("previous declaration %q+#D here", olddecl);
1461 else if (compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1462 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1464 error ("new declaration %q#D", newdecl);
1465 error ("ambiguates old declaration %q+#D", olddecl);
1466 return error_mark_node;
1473 error ("conflicting declaration %q#D", newdecl);
1474 error ("%q+D has a previous declaration as %q#D", olddecl, olddecl);
1475 return error_mark_node;
1478 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1479 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1480 && (!DECL_TEMPLATE_INFO (newdecl)
1481 || (DECL_TI_TEMPLATE (newdecl)
1482 != DECL_TI_TEMPLATE (olddecl))))
1483 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1484 && (!DECL_TEMPLATE_INFO (olddecl)
1485 || (DECL_TI_TEMPLATE (olddecl)
1486 != DECL_TI_TEMPLATE (newdecl))))))
1487 /* It's OK to have a template specialization and a non-template
1488 with the same type, or to have specializations of two
1489 different templates with the same type. Note that if one is a
1490 specialization, and the other is an instantiation of the same
1491 template, that we do not exit at this point. That situation
1492 can occur if we instantiate a template class, and then
1493 specialize one of its methods. This situation is valid, but
1494 the declarations must be merged in the usual way. */
1496 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1497 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1498 && !DECL_USE_TEMPLATE (newdecl))
1499 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1500 && !DECL_USE_TEMPLATE (olddecl))))
1501 /* One of the declarations is a template instantiation, and the
1502 other is not a template at all. That's OK. */
1504 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1506 /* In [namespace.alias] we have:
1508 In a declarative region, a namespace-alias-definition can be
1509 used to redefine a namespace-alias declared in that declarative
1510 region to refer only to the namespace to which it already
1513 Therefore, if we encounter a second alias directive for the same
1514 alias, we can just ignore the second directive. */
1515 if (DECL_NAMESPACE_ALIAS (newdecl)
1516 && (DECL_NAMESPACE_ALIAS (newdecl)
1517 == DECL_NAMESPACE_ALIAS (olddecl)))
1519 /* [namespace.alias]
1521 A namespace-name or namespace-alias shall not be declared as
1522 the name of any other entity in the same declarative region.
1523 A namespace-name defined at global scope shall not be
1524 declared as the name of any other entity in any global scope
1526 error ("declaration of namespace %qD conflicts with", newdecl);
1527 error ("previous declaration of namespace %q+D here", olddecl);
1528 return error_mark_node;
1532 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1535 error_at (DECL_SOURCE_LOCATION (newdecl), errmsg, newdecl);
1536 if (DECL_NAME (olddecl) != NULL_TREE)
1537 error ((DECL_INITIAL (olddecl) && namespace_bindings_p ())
1538 ? "%q+#D previously defined here"
1539 : "%q+#D previously declared here", olddecl);
1540 return error_mark_node;
1542 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1543 && DECL_INITIAL (olddecl) != NULL_TREE
1544 && !prototype_p (TREE_TYPE (olddecl))
1545 && prototype_p (TREE_TYPE (newdecl)))
1547 /* Prototype decl follows defn w/o prototype. */
1548 warning_at (input_location, 0, "prototype for %q+#D", newdecl);
1549 warning_at (DECL_SOURCE_LOCATION (olddecl), 0,
1550 "follows non-prototype definition here");
1552 else if ((TREE_CODE (olddecl) == FUNCTION_DECL
1553 || TREE_CODE (olddecl) == VAR_DECL)
1554 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1557 If two declarations of the same function or object
1558 specify different linkage-specifications ..., the program
1559 is ill-formed.... Except for functions with C++ linkage,
1560 a function declaration without a linkage specification
1561 shall not precede the first linkage specification for
1562 that function. A function can be declared without a
1563 linkage specification after an explicit linkage
1564 specification has been seen; the linkage explicitly
1565 specified in the earlier declaration is not affected by
1566 such a function declaration.
1568 DR 563 raises the question why the restrictions on
1569 functions should not also apply to objects. Older
1570 versions of G++ silently ignore the linkage-specification
1578 which is clearly wrong. Therefore, we now treat objects
1580 if (current_lang_depth () == 0)
1582 /* There is no explicit linkage-specification, so we use
1583 the linkage from the previous declaration. */
1584 if (!DECL_LANG_SPECIFIC (newdecl))
1585 retrofit_lang_decl (newdecl);
1586 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1590 error ("previous declaration of %q+#D with %qL linkage",
1591 olddecl, DECL_LANGUAGE (olddecl));
1592 error ("conflicts with new declaration with %qL linkage",
1593 DECL_LANGUAGE (newdecl));
1597 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1599 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1601 tree t1 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1602 tree t2 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1605 if (TREE_CODE (TREE_TYPE (newdecl)) == METHOD_TYPE)
1606 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2);
1608 for (; t1 && t1 != void_list_node;
1609 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1610 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1612 if (1 == simple_cst_equal (TREE_PURPOSE (t1),
1615 permerror (input_location, "default argument given for parameter %d of %q#D",
1617 permerror (input_location, "after previous specification in %q+#D", olddecl);
1621 error ("default argument given for parameter %d of %q#D",
1623 error ("after previous specification in %q+#D",
1630 /* Do not merge an implicit typedef with an explicit one. In:
1634 typedef class A A __attribute__ ((foo));
1636 the attribute should apply only to the typedef. */
1637 if (TREE_CODE (olddecl) == TYPE_DECL
1638 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1639 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1642 /* If new decl is `static' and an `extern' was seen previously,
1644 warn_extern_redeclared_static (newdecl, olddecl);
1646 if (!validate_constexpr_redeclaration (olddecl, newdecl))
1647 return error_mark_node;
1649 /* We have committed to returning 1 at this point. */
1650 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1652 /* Now that functions must hold information normally held
1653 by field decls, there is extra work to do so that
1654 declaration information does not get destroyed during
1656 if (DECL_VINDEX (olddecl))
1657 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1658 if (DECL_CONTEXT (olddecl))
1659 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1660 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1661 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1662 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1663 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1664 DECL_INVALID_OVERRIDER_P (newdecl) |= DECL_INVALID_OVERRIDER_P (olddecl);
1665 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1666 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1667 SET_OVERLOADED_OPERATOR_CODE
1668 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1669 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1671 /* Optionally warn about more than one declaration for the same
1672 name, but don't warn about a function declaration followed by a
1674 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1675 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1676 /* Don't warn about extern decl followed by definition. */
1677 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1678 /* Don't warn about friends, let add_friend take care of it. */
1679 && ! (newdecl_is_friend || DECL_FRIEND_P (olddecl)))
1681 warning (OPT_Wredundant_decls, "redundant redeclaration of %qD in same scope", newdecl);
1682 warning (OPT_Wredundant_decls, "previous declaration of %q+D", olddecl);
1685 if (DECL_DELETED_FN (newdecl))
1687 error ("deleted definition of %qD", newdecl);
1688 error ("after previous declaration %q+D", olddecl);
1692 /* Deal with C++: must preserve virtual function table size. */
1693 if (TREE_CODE (olddecl) == TYPE_DECL)
1695 tree newtype = TREE_TYPE (newdecl);
1696 tree oldtype = TREE_TYPE (olddecl);
1698 if (newtype != error_mark_node && oldtype != error_mark_node
1699 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1700 CLASSTYPE_FRIEND_CLASSES (newtype)
1701 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1703 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1706 /* Copy all the DECL_... slots specified in the new decl
1707 except for any that we copy here from the old type. */
1708 DECL_ATTRIBUTES (newdecl)
1709 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1711 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1715 old_result = DECL_TEMPLATE_RESULT (olddecl);
1716 new_result = DECL_TEMPLATE_RESULT (newdecl);
1717 TREE_TYPE (olddecl) = TREE_TYPE (old_result);
1718 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1719 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1720 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1722 DECL_ATTRIBUTES (old_result)
1723 = (*targetm.merge_decl_attributes) (old_result, new_result);
1725 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1727 if (GNU_INLINE_P (old_result) != GNU_INLINE_P (new_result)
1728 && DECL_INITIAL (new_result))
1730 if (DECL_INITIAL (old_result))
1731 DECL_UNINLINABLE (old_result) = 1;
1733 DECL_UNINLINABLE (old_result) = DECL_UNINLINABLE (new_result);
1734 DECL_EXTERNAL (old_result) = DECL_EXTERNAL (new_result);
1735 DECL_NOT_REALLY_EXTERN (old_result)
1736 = DECL_NOT_REALLY_EXTERN (new_result);
1737 DECL_INTERFACE_KNOWN (old_result)
1738 = DECL_INTERFACE_KNOWN (new_result);
1739 DECL_DECLARED_INLINE_P (old_result)
1740 = DECL_DECLARED_INLINE_P (new_result);
1741 DECL_DISREGARD_INLINE_LIMITS (old_result)
1742 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1747 DECL_DECLARED_INLINE_P (old_result)
1748 |= DECL_DECLARED_INLINE_P (new_result);
1749 DECL_DISREGARD_INLINE_LIMITS (old_result)
1750 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1751 check_redeclaration_exception_specification (newdecl, olddecl);
1755 /* If the new declaration is a definition, update the file and
1756 line information on the declaration, and also make
1757 the old declaration the same definition. */
1758 if (DECL_INITIAL (new_result) != NULL_TREE)
1760 DECL_SOURCE_LOCATION (olddecl)
1761 = DECL_SOURCE_LOCATION (old_result)
1762 = DECL_SOURCE_LOCATION (newdecl);
1763 DECL_INITIAL (old_result) = DECL_INITIAL (new_result);
1764 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1767 DECL_ARGUMENTS (old_result)
1768 = DECL_ARGUMENTS (new_result);
1769 for (parm = DECL_ARGUMENTS (old_result); parm;
1770 parm = DECL_CHAIN (parm))
1771 DECL_CONTEXT (parm) = old_result;
1780 /* Automatically handles default parameters. */
1781 tree oldtype = TREE_TYPE (olddecl);
1784 /* Merge the data types specified in the two decls. */
1785 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1787 /* If merge_types produces a non-typedef type, just use the old type. */
1788 if (TREE_CODE (newdecl) == TYPE_DECL
1789 && newtype == DECL_ORIGINAL_TYPE (newdecl))
1792 if (TREE_CODE (newdecl) == VAR_DECL)
1794 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
1795 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
1796 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl)
1797 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl);
1798 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
1799 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
1801 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
1802 if (DECL_LANG_SPECIFIC (olddecl)
1803 && CP_DECL_THREADPRIVATE_P (olddecl))
1805 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
1806 if (!DECL_LANG_SPECIFIC (newdecl))
1807 retrofit_lang_decl (newdecl);
1809 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
1810 CP_DECL_THREADPRIVATE_P (newdecl) = 1;
1814 /* Do this after calling `merge_types' so that default
1815 parameters don't confuse us. */
1816 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1817 check_redeclaration_exception_specification (newdecl, olddecl);
1818 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
1820 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1821 check_default_args (newdecl);
1823 /* Lay the type out, unless already done. */
1824 if (! same_type_p (newtype, oldtype)
1825 && TREE_TYPE (newdecl) != error_mark_node
1826 && !(processing_template_decl && uses_template_parms (newdecl)))
1827 layout_type (TREE_TYPE (newdecl));
1829 if ((TREE_CODE (newdecl) == VAR_DECL
1830 || TREE_CODE (newdecl) == PARM_DECL
1831 || TREE_CODE (newdecl) == RESULT_DECL
1832 || TREE_CODE (newdecl) == FIELD_DECL
1833 || TREE_CODE (newdecl) == TYPE_DECL)
1834 && !(processing_template_decl && uses_template_parms (newdecl)))
1835 layout_decl (newdecl, 0);
1837 /* Merge the type qualifiers. */
1838 if (TREE_READONLY (newdecl))
1839 TREE_READONLY (olddecl) = 1;
1840 if (TREE_THIS_VOLATILE (newdecl))
1841 TREE_THIS_VOLATILE (olddecl) = 1;
1842 if (TREE_NOTHROW (newdecl))
1843 TREE_NOTHROW (olddecl) = 1;
1845 /* Merge deprecatedness. */
1846 if (TREE_DEPRECATED (newdecl))
1847 TREE_DEPRECATED (olddecl) = 1;
1849 /* Preserve function specific target and optimization options */
1850 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1852 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
1853 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
1854 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
1855 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
1857 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
1858 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
1859 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
1860 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
1863 /* Merge the initialization information. */
1864 if (DECL_INITIAL (newdecl) == NULL_TREE
1865 && DECL_INITIAL (olddecl) != NULL_TREE)
1867 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1868 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1869 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1871 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1872 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1876 /* Merge the section attribute.
1877 We want to issue an error if the sections conflict but that must be
1878 done later in decl_attributes since we are called before attributes
1880 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1881 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1883 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1885 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1886 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1887 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1888 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1889 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
1890 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1891 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
1892 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
1893 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1894 DECL_LOOPING_CONST_OR_PURE_P (newdecl)
1895 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl);
1896 /* Keep the old RTL. */
1897 COPY_DECL_RTL (olddecl, newdecl);
1899 else if (TREE_CODE (newdecl) == VAR_DECL
1900 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
1902 /* Keep the old RTL. We cannot keep the old RTL if the old
1903 declaration was for an incomplete object and the new
1904 declaration is not since many attributes of the RTL will
1906 COPY_DECL_RTL (olddecl, newdecl);
1909 /* If cannot merge, then use the new type and qualifiers,
1910 and don't preserve the old rtl. */
1913 /* Clean out any memory we had of the old declaration. */
1914 tree oldstatic = value_member (olddecl, static_aggregates);
1916 TREE_VALUE (oldstatic) = error_mark_node;
1918 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1919 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1920 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1921 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1924 /* Merge the storage class information. */
1925 merge_weak (newdecl, olddecl);
1927 if (DECL_ONE_ONLY (olddecl))
1928 DECL_COMDAT_GROUP (newdecl) = DECL_COMDAT_GROUP (olddecl);
1930 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
1931 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1932 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
1933 if (! DECL_EXTERNAL (olddecl))
1934 DECL_EXTERNAL (newdecl) = 0;
1936 new_template_info = NULL_TREE;
1937 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
1939 bool new_redefines_gnu_inline = false;
1941 if (new_defines_function
1942 && ((DECL_INTERFACE_KNOWN (olddecl)
1943 && TREE_CODE (olddecl) == FUNCTION_DECL)
1944 || (TREE_CODE (olddecl) == TEMPLATE_DECL
1945 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
1946 == FUNCTION_DECL))))
1950 if (TREE_CODE (fn) == TEMPLATE_DECL)
1951 fn = DECL_TEMPLATE_RESULT (olddecl);
1953 new_redefines_gnu_inline = GNU_INLINE_P (fn) && DECL_INITIAL (fn);
1956 if (!new_redefines_gnu_inline)
1958 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
1959 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
1960 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
1962 DECL_TEMPLATE_INSTANTIATED (newdecl)
1963 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
1964 DECL_ODR_USED (newdecl) |= DECL_ODR_USED (olddecl);
1966 /* If the OLDDECL is an instantiation and/or specialization,
1967 then the NEWDECL must be too. But, it may not yet be marked
1968 as such if the caller has created NEWDECL, but has not yet
1969 figured out that it is a redeclaration. */
1970 if (!DECL_USE_TEMPLATE (newdecl))
1971 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
1973 /* Don't really know how much of the language-specific
1974 values we should copy from old to new. */
1975 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
1976 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
1977 DECL_INITIALIZED_IN_CLASS_P (newdecl)
1978 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
1980 if (LANG_DECL_HAS_MIN (newdecl))
1982 DECL_LANG_SPECIFIC (newdecl)->u.min.u2 =
1983 DECL_LANG_SPECIFIC (olddecl)->u.min.u2;
1984 if (DECL_TEMPLATE_INFO (newdecl))
1985 new_template_info = DECL_TEMPLATE_INFO (newdecl);
1986 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
1988 /* Only functions have these fields. */
1989 if (TREE_CODE (newdecl) == FUNCTION_DECL
1990 || DECL_FUNCTION_TEMPLATE_P (newdecl))
1992 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
1993 olddecl_friend = DECL_FRIEND_P (olddecl);
1994 hidden_friend = (DECL_ANTICIPATED (olddecl)
1995 && DECL_HIDDEN_FRIEND_P (olddecl)
1996 && newdecl_is_friend);
1997 DECL_BEFRIENDING_CLASSES (newdecl)
1998 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
1999 DECL_BEFRIENDING_CLASSES (olddecl));
2000 /* DECL_THUNKS is only valid for virtual functions,
2001 otherwise it is a DECL_FRIEND_CONTEXT. */
2002 if (DECL_VIRTUAL_P (newdecl))
2003 DECL_THUNKS (newdecl) = DECL_THUNKS (olddecl);
2005 /* Only variables have this field. */
2006 else if (TREE_CODE (newdecl) == VAR_DECL
2007 && VAR_HAD_UNKNOWN_BOUND (olddecl))
2008 SET_VAR_HAD_UNKNOWN_BOUND (newdecl);
2011 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2015 /* Merge parameter attributes. */
2016 tree oldarg, newarg;
2017 for (oldarg = DECL_ARGUMENTS(olddecl),
2018 newarg = DECL_ARGUMENTS(newdecl);
2020 oldarg = DECL_CHAIN(oldarg), newarg = DECL_CHAIN(newarg)) {
2021 DECL_ATTRIBUTES (newarg)
2022 = (*targetm.merge_decl_attributes) (oldarg, newarg);
2023 DECL_ATTRIBUTES (oldarg) = DECL_ATTRIBUTES (newarg);
2026 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
2027 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
2029 /* If newdecl is not a specialization, then it is not a
2030 template-related function at all. And that means that we
2031 should have exited above, returning 0. */
2032 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
2034 if (DECL_ODR_USED (olddecl))
2035 /* From [temp.expl.spec]:
2037 If a template, a member template or the member of a class
2038 template is explicitly specialized then that
2039 specialization shall be declared before the first use of
2040 that specialization that would cause an implicit
2041 instantiation to take place, in every translation unit in
2042 which such a use occurs. */
2043 error ("explicit specialization of %qD after first use",
2046 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
2048 /* Don't propagate visibility from the template to the
2049 specialization here. We'll do that in determine_visibility if
2051 DECL_VISIBILITY_SPECIFIED (olddecl) = 0;
2053 /* [temp.expl.spec/14] We don't inline explicit specialization
2054 just because the primary template says so. */
2056 else if (new_defines_function && DECL_INITIAL (olddecl))
2058 /* Never inline re-defined extern inline functions.
2059 FIXME: this could be better handled by keeping both
2060 function as separate declarations. */
2061 DECL_UNINLINABLE (newdecl) = 1;
2065 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
2066 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
2068 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
2070 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
2071 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
2073 DECL_DISREGARD_INLINE_LIMITS (newdecl)
2074 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
2075 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
2076 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
2079 /* Preserve abstractness on cloned [cd]tors. */
2080 DECL_ABSTRACT (newdecl) = DECL_ABSTRACT (olddecl);
2082 /* Update newdecl's parms to point at olddecl. */
2083 for (parm = DECL_ARGUMENTS (newdecl); parm;
2084 parm = DECL_CHAIN (parm))
2085 DECL_CONTEXT (parm) = olddecl;
2089 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
2090 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
2091 COPY_DECL_RTL (newdecl, olddecl);
2093 if (! types_match || new_defines_function)
2095 /* These need to be copied so that the names are available.
2096 Note that if the types do match, we'll preserve inline
2097 info and other bits, but if not, we won't. */
2098 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
2099 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
2101 if (new_defines_function)
2102 /* If defining a function declared with other language
2103 linkage, use the previously declared language linkage. */
2104 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
2105 else if (types_match)
2107 /* If redeclaring a builtin function, and not a definition,
2108 it stays built in. */
2109 if (DECL_BUILT_IN (olddecl))
2111 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2112 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2113 /* If we're keeping the built-in definition, keep the rtl,
2114 regardless of declaration matches. */
2115 COPY_DECL_RTL (olddecl, newdecl);
2118 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2119 /* Don't clear out the arguments if we're just redeclaring a
2121 if (DECL_ARGUMENTS (olddecl))
2122 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2125 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
2126 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
2128 /* Now preserve various other info from the definition. */
2129 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
2130 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
2131 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2132 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2134 /* Warn about conflicting visibility specifications. */
2135 if (DECL_VISIBILITY_SPECIFIED (olddecl)
2136 && DECL_VISIBILITY_SPECIFIED (newdecl)
2137 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2139 warning_at (input_location, OPT_Wattributes,
2140 "%q+D: visibility attribute ignored because it", newdecl);
2141 warning_at (DECL_SOURCE_LOCATION (olddecl), OPT_Wattributes,
2142 "conflicts with previous declaration here");
2144 /* Choose the declaration which specified visibility. */
2145 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2147 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2148 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2150 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2151 so keep this behavior. */
2152 if (TREE_CODE (newdecl) == VAR_DECL && DECL_HAS_INIT_PRIORITY_P (newdecl))
2154 SET_DECL_INIT_PRIORITY (olddecl, DECL_INIT_PRIORITY (newdecl));
2155 DECL_HAS_INIT_PRIORITY_P (olddecl) = 1;
2157 /* Likewise for DECL_USER_ALIGN and DECL_PACKED. */
2158 DECL_USER_ALIGN (olddecl) = DECL_USER_ALIGN (newdecl);
2159 if (TREE_CODE (newdecl) == FIELD_DECL)
2160 DECL_PACKED (olddecl) = DECL_PACKED (newdecl);
2162 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2163 with that from NEWDECL below. */
2164 if (DECL_LANG_SPECIFIC (olddecl))
2166 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
2167 != DECL_LANG_SPECIFIC (newdecl));
2168 ggc_free (DECL_LANG_SPECIFIC (olddecl));
2171 /* Merge the USED information. */
2172 if (TREE_USED (olddecl))
2173 TREE_USED (newdecl) = 1;
2174 else if (TREE_USED (newdecl))
2175 TREE_USED (olddecl) = 1;
2176 if (TREE_CODE (newdecl) == VAR_DECL)
2178 if (DECL_READ_P (olddecl))
2179 DECL_READ_P (newdecl) = 1;
2180 else if (DECL_READ_P (newdecl))
2181 DECL_READ_P (olddecl) = 1;
2183 if (DECL_PRESERVE_P (olddecl))
2184 DECL_PRESERVE_P (newdecl) = 1;
2185 else if (DECL_PRESERVE_P (newdecl))
2186 DECL_PRESERVE_P (olddecl) = 1;
2188 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2192 function_size = sizeof (struct tree_decl_common);
2194 memcpy ((char *) olddecl + sizeof (struct tree_common),
2195 (char *) newdecl + sizeof (struct tree_common),
2196 function_size - sizeof (struct tree_common));
2198 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2199 (char *) newdecl + sizeof (struct tree_decl_common),
2200 sizeof (struct tree_function_decl) - sizeof (struct tree_decl_common));
2201 if (new_template_info)
2202 /* If newdecl is a template instantiation, it is possible that
2203 the following sequence of events has occurred:
2205 o A friend function was declared in a class template. The
2206 class template was instantiated.
2208 o The instantiation of the friend declaration was
2209 recorded on the instantiation list, and is newdecl.
2211 o Later, however, instantiate_class_template called pushdecl
2212 on the newdecl to perform name injection. But, pushdecl in
2213 turn called duplicate_decls when it discovered that another
2214 declaration of a global function with the same name already
2217 o Here, in duplicate_decls, we decided to clobber newdecl.
2219 If we're going to do that, we'd better make sure that
2220 olddecl, and not newdecl, is on the list of
2221 instantiations so that if we try to do the instantiation
2222 again we won't get the clobbered declaration. */
2223 reregister_specialization (newdecl,
2229 size_t size = tree_code_size (TREE_CODE (olddecl));
2230 memcpy ((char *) olddecl + sizeof (struct tree_common),
2231 (char *) newdecl + sizeof (struct tree_common),
2232 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2233 switch (TREE_CODE (olddecl))
2243 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2244 (char *) newdecl + sizeof (struct tree_decl_common),
2245 size - sizeof (struct tree_decl_common)
2246 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2250 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2251 (char *) newdecl + sizeof (struct tree_decl_common),
2252 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)
2253 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2257 DECL_UID (olddecl) = olddecl_uid;
2259 DECL_FRIEND_P (olddecl) = 1;
2262 DECL_ANTICIPATED (olddecl) = 1;
2263 DECL_HIDDEN_FRIEND_P (olddecl) = 1;
2266 /* NEWDECL contains the merged attribute lists.
2267 Update OLDDECL to be the same. */
2268 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2270 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2271 so that encode_section_info has a chance to look at the new decl
2272 flags and attributes. */
2273 if (DECL_RTL_SET_P (olddecl)
2274 && (TREE_CODE (olddecl) == FUNCTION_DECL
2275 || (TREE_CODE (olddecl) == VAR_DECL
2276 && TREE_STATIC (olddecl))))
2277 make_decl_rtl (olddecl);
2279 /* The NEWDECL will no longer be needed. Because every out-of-class
2280 declaration of a member results in a call to duplicate_decls,
2281 freeing these nodes represents in a significant savings. */
2287 /* Return zero if the declaration NEWDECL is valid
2288 when the declaration OLDDECL (assumed to be for the same name)
2289 has already been seen.
2290 Otherwise return an error message format string with a %s
2291 where the identifier should go. */
2294 redeclaration_error_message (tree newdecl, tree olddecl)
2296 if (TREE_CODE (newdecl) == TYPE_DECL)
2298 /* Because C++ can put things into name space for free,
2299 constructs like "typedef struct foo { ... } foo"
2300 would look like an erroneous redeclaration. */
2301 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
2304 return G_("redefinition of %q#D");
2306 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2308 /* If this is a pure function, its olddecl will actually be
2309 the original initialization to `0' (which we force to call
2310 abort()). Don't complain about redefinition in this case. */
2311 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
2312 && DECL_INITIAL (olddecl) == NULL_TREE)
2315 /* If both functions come from different namespaces, this is not
2316 a redeclaration - this is a conflict with a used function. */
2317 if (DECL_NAMESPACE_SCOPE_P (olddecl)
2318 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
2319 && ! decls_match (olddecl, newdecl))
2320 return G_("%qD conflicts with used function");
2322 /* We'll complain about linkage mismatches in
2323 warn_extern_redeclared_static. */
2325 /* Defining the same name twice is no good. */
2326 if (DECL_INITIAL (olddecl) != NULL_TREE
2327 && DECL_INITIAL (newdecl) != NULL_TREE)
2329 if (DECL_NAME (olddecl) == NULL_TREE)
2330 return G_("%q#D not declared in class");
2331 else if (!GNU_INLINE_P (olddecl)
2332 || GNU_INLINE_P (newdecl))
2333 return G_("redefinition of %q#D");
2336 if (DECL_DECLARED_INLINE_P (olddecl) && DECL_DECLARED_INLINE_P (newdecl))
2338 bool olda = GNU_INLINE_P (olddecl);
2339 bool newa = GNU_INLINE_P (newdecl);
2344 return G_("%q+D redeclared inline with "
2345 "%<gnu_inline%> attribute");
2347 return G_("%q+D redeclared inline without "
2348 "%<gnu_inline%> attribute");
2354 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
2358 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
2360 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
2361 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
2362 return G_("redefinition of %q#D");
2366 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
2367 || (DECL_TEMPLATE_RESULT (newdecl)
2368 == DECL_TEMPLATE_RESULT (olddecl)))
2371 nt = DECL_TEMPLATE_RESULT (newdecl);
2372 if (DECL_TEMPLATE_INFO (nt))
2373 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
2374 ot = DECL_TEMPLATE_RESULT (olddecl);
2375 if (DECL_TEMPLATE_INFO (ot))
2376 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
2377 if (DECL_INITIAL (nt) && DECL_INITIAL (ot)
2378 && (!GNU_INLINE_P (ot) || GNU_INLINE_P (nt)))
2379 return G_("redefinition of %q#D");
2381 if (DECL_DECLARED_INLINE_P (ot) && DECL_DECLARED_INLINE_P (nt))
2383 bool olda = GNU_INLINE_P (ot);
2384 bool newa = GNU_INLINE_P (nt);
2389 return G_("%q+D redeclared inline with "
2390 "%<gnu_inline%> attribute");
2392 return G_("%q+D redeclared inline without "
2393 "%<gnu_inline%> attribute");
2397 /* Core issue #226 (C++0x):
2399 If a friend function template declaration specifies a
2400 default template-argument, that declaration shall be a
2401 definition and shall be the only declaration of the
2402 function template in the translation unit. */
2403 if ((cxx_dialect != cxx98)
2404 && TREE_CODE (ot) == FUNCTION_DECL && DECL_FRIEND_P (ot)
2405 && !check_default_tmpl_args (nt, DECL_TEMPLATE_PARMS (newdecl),
2406 /*is_primary=*/1, /*is_partial=*/0,
2407 /*is_friend_decl=*/2))
2408 return G_("redeclaration of friend %q#D "
2409 "may not have default template arguments");
2413 else if (TREE_CODE (newdecl) == VAR_DECL
2414 && DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl)
2415 && (! DECL_LANG_SPECIFIC (olddecl)
2416 || ! CP_DECL_THREADPRIVATE_P (olddecl)
2417 || DECL_THREAD_LOCAL_P (newdecl)))
2419 /* Only variables can be thread-local, and all declarations must
2420 agree on this property. */
2421 if (DECL_THREAD_LOCAL_P (newdecl))
2422 return G_("thread-local declaration of %q#D follows "
2423 "non-thread-local declaration");
2425 return G_("non-thread-local declaration of %q#D follows "
2426 "thread-local declaration");
2428 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2430 /* The objects have been declared at namespace scope. If either
2431 is a member of an anonymous union, then this is an invalid
2432 redeclaration. For example:
2438 if ((TREE_CODE (newdecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (newdecl))
2439 || (TREE_CODE (olddecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (olddecl)))
2440 return G_("redeclaration of %q#D");
2441 /* If at least one declaration is a reference, there is no
2442 conflict. For example:
2448 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2450 /* Reject two definitions. */
2451 return G_("redefinition of %q#D");
2455 /* Objects declared with block scope: */
2456 /* Reject two definitions, and reject a definition
2457 together with an external reference. */
2458 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2459 return G_("redeclaration of %q#D");
2464 /* Hash and equality functions for the named_label table. */
2467 named_label_entry_hash (const void *data)
2469 const struct named_label_entry *ent = (const struct named_label_entry *) data;
2470 return DECL_UID (ent->label_decl);
2474 named_label_entry_eq (const void *a, const void *b)
2476 const struct named_label_entry *ent_a = (const struct named_label_entry *) a;
2477 const struct named_label_entry *ent_b = (const struct named_label_entry *) b;
2478 return ent_a->label_decl == ent_b->label_decl;
2481 /* Create a new label, named ID. */
2484 make_label_decl (tree id, int local_p)
2486 struct named_label_entry *ent;
2490 decl = build_decl (input_location, LABEL_DECL, id, void_type_node);
2492 DECL_CONTEXT (decl) = current_function_decl;
2493 DECL_MODE (decl) = VOIDmode;
2494 C_DECLARED_LABEL_FLAG (decl) = local_p;
2496 /* Say where one reference is to the label, for the sake of the
2497 error if it is not defined. */
2498 DECL_SOURCE_LOCATION (decl) = input_location;
2500 /* Record the fact that this identifier is bound to this label. */
2501 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2503 /* Create the label htab for the function on demand. */
2505 named_labels = htab_create_ggc (13, named_label_entry_hash,
2506 named_label_entry_eq, NULL);
2508 /* Record this label on the list of labels used in this function.
2509 We do this before calling make_label_decl so that we get the
2510 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2511 ent = ggc_alloc_cleared_named_label_entry ();
2512 ent->label_decl = decl;
2514 slot = htab_find_slot (named_labels, ent, INSERT);
2515 gcc_assert (*slot == NULL);
2521 /* Look for a label named ID in the current function. If one cannot
2522 be found, create one. (We keep track of used, but undefined,
2523 labels, and complain about them at the end of a function.) */
2526 lookup_label (tree id)
2530 timevar_push (TV_NAME_LOOKUP);
2531 /* You can't use labels at global scope. */
2532 if (current_function_decl == NULL_TREE)
2534 error ("label %qE referenced outside of any function", id);
2535 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, NULL_TREE);
2538 /* See if we've already got this label. */
2539 decl = IDENTIFIER_LABEL_VALUE (id);
2540 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2541 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2543 decl = make_label_decl (id, /*local_p=*/0);
2544 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2547 /* Declare a local label named ID. */
2550 declare_local_label (tree id)
2553 cp_label_binding *bind;
2555 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2556 this scope we can restore the old value of IDENTIFIER_TYPE_VALUE. */
2557 bind = VEC_safe_push (cp_label_binding, gc,
2558 current_binding_level->shadowed_labels, NULL);
2559 bind->prev_value = IDENTIFIER_LABEL_VALUE (id);
2561 decl = make_label_decl (id, /*local_p=*/1);
2567 /* Returns nonzero if it is ill-formed to jump past the declaration of
2568 DECL. Returns 2 if it's also a real problem. */
2571 decl_jump_unsafe (tree decl)
2573 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
2574 with automatic storage duration is not in scope to a point where it is
2575 in scope is ill-formed unless the variable has scalar type, class type
2576 with a trivial default constructor and a trivial destructor, a
2577 cv-qualified version of one of these types, or an array of one of the
2578 preceding types and is declared without an initializer (8.5). */
2579 tree type = TREE_TYPE (decl);
2581 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl)
2582 || type == error_mark_node)
2585 type = strip_array_types (type);
2587 if (type_has_nontrivial_default_init (TREE_TYPE (decl))
2588 || DECL_NONTRIVIALLY_INITIALIZED_P (decl))
2591 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2597 /* A subroutine of check_previous_goto_1 to identify a branch to the user. */
2600 identify_goto (tree decl, const location_t *locus)
2603 permerror (input_location, "jump to label %qD", decl);
2605 permerror (input_location, "jump to case label");
2607 permerror (*locus, " from here");
2610 /* Check that a single previously seen jump to a newly defined label
2611 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2612 the jump context; NAMES are the names in scope in LEVEL at the jump
2613 context; LOCUS is the source position of the jump or 0. Returns
2614 true if all is well. */
2617 check_previous_goto_1 (tree decl, struct cp_binding_level* level, tree names,
2618 bool exited_omp, const location_t *locus)
2620 struct cp_binding_level *b;
2621 bool identified = false, saw_eh = false, saw_omp = false;
2625 identify_goto (decl, locus);
2626 error (" exits OpenMP structured block");
2627 identified = saw_omp = true;
2630 for (b = current_binding_level; b ; b = b->level_chain)
2632 tree new_decls, old_decls = (b == level ? names : NULL_TREE);
2634 for (new_decls = b->names; new_decls != old_decls;
2635 new_decls = DECL_CHAIN (new_decls))
2637 int problem = decl_jump_unsafe (new_decls);
2643 identify_goto (decl, locus);
2647 error (" crosses initialization of %q+#D", new_decls);
2649 permerror (input_location, " enters scope of %q+#D which has "
2650 "non-trivial destructor", new_decls);
2655 if ((b->kind == sk_try || b->kind == sk_catch) && !saw_eh)
2659 identify_goto (decl, locus);
2662 if (b->kind == sk_try)
2663 error (" enters try block");
2665 error (" enters catch block");
2668 if (b->kind == sk_omp && !saw_omp)
2672 identify_goto (decl, locus);
2675 error (" enters OpenMP structured block");
2684 check_previous_goto (tree decl, struct named_label_use_entry *use)
2686 check_previous_goto_1 (decl, use->binding_level,
2687 use->names_in_scope, use->in_omp_scope,
2688 &use->o_goto_locus);
2692 check_switch_goto (struct cp_binding_level* level)
2694 return check_previous_goto_1 (NULL_TREE, level, level->names, false, NULL);
2697 /* Check that a new jump to a label DECL is OK. Called by
2698 finish_goto_stmt. */
2701 check_goto (tree decl)
2703 struct named_label_entry *ent, dummy;
2704 bool saw_catch = false, identified = false;
2708 /* We can't know where a computed goto is jumping.
2709 So we assume that it's OK. */
2710 if (TREE_CODE (decl) != LABEL_DECL)
2713 /* We didn't record any information about this label when we created it,
2714 and there's not much point since it's trivial to analyze as a return. */
2715 if (decl == cdtor_label)
2718 dummy.label_decl = decl;
2719 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2720 gcc_assert (ent != NULL);
2722 /* If the label hasn't been defined yet, defer checking. */
2723 if (! DECL_INITIAL (decl))
2725 struct named_label_use_entry *new_use;
2727 /* Don't bother creating another use if the last goto had the
2728 same data, and will therefore create the same set of errors. */
2730 && ent->uses->names_in_scope == current_binding_level->names)
2733 new_use = ggc_alloc_named_label_use_entry ();
2734 new_use->binding_level = current_binding_level;
2735 new_use->names_in_scope = current_binding_level->names;
2736 new_use->o_goto_locus = input_location;
2737 new_use->in_omp_scope = false;
2739 new_use->next = ent->uses;
2740 ent->uses = new_use;
2744 if (ent->in_try_scope || ent->in_catch_scope
2745 || ent->in_omp_scope || !VEC_empty (tree, ent->bad_decls))
2747 permerror (input_location, "jump to label %q+D", decl);
2748 permerror (input_location, " from here");
2752 FOR_EACH_VEC_ELT (tree, ent->bad_decls, ix, bad)
2754 int u = decl_jump_unsafe (bad);
2756 if (u > 1 && DECL_ARTIFICIAL (bad))
2758 /* Can't skip init of __exception_info. */
2759 error_at (DECL_SOURCE_LOCATION (bad), " enters catch block");
2763 error (" skips initialization of %q+#D", bad);
2765 permerror (input_location, " enters scope of %q+#D which has "
2766 "non-trivial destructor", bad);
2769 if (ent->in_try_scope)
2770 error (" enters try block");
2771 else if (ent->in_catch_scope && !saw_catch)
2772 error (" enters catch block");
2774 if (ent->in_omp_scope)
2775 error (" enters OpenMP structured block");
2776 else if (flag_openmp)
2778 struct cp_binding_level *b;
2779 for (b = current_binding_level; b ; b = b->level_chain)
2781 if (b == ent->binding_level)
2783 if (b->kind == sk_omp)
2787 permerror (input_location, "jump to label %q+D", decl);
2788 permerror (input_location, " from here");
2791 error (" exits OpenMP structured block");
2798 /* Check that a return is ok wrt OpenMP structured blocks.
2799 Called by finish_return_stmt. Returns true if all is well. */
2802 check_omp_return (void)
2804 struct cp_binding_level *b;
2805 for (b = current_binding_level; b ; b = b->level_chain)
2806 if (b->kind == sk_omp)
2808 error ("invalid exit from OpenMP structured block");
2814 /* Define a label, specifying the location in the source file.
2815 Return the LABEL_DECL node for the label. */
2818 define_label (location_t location, tree name)
2820 struct named_label_entry *ent, dummy;
2821 struct cp_binding_level *p;
2824 timevar_push (TV_NAME_LOOKUP);
2826 decl = lookup_label (name);
2828 dummy.label_decl = decl;
2829 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2830 gcc_assert (ent != NULL);
2832 /* After labels, make any new cleanups in the function go into their
2833 own new (temporary) binding contour. */
2834 for (p = current_binding_level;
2835 p->kind != sk_function_parms;
2837 p->more_cleanups_ok = 0;
2839 if (name == get_identifier ("wchar_t"))
2840 permerror (input_location, "label named wchar_t");
2842 if (DECL_INITIAL (decl) != NULL_TREE)
2844 error ("duplicate label %qD", decl);
2845 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
2849 struct named_label_use_entry *use;
2851 /* Mark label as having been defined. */
2852 DECL_INITIAL (decl) = error_mark_node;
2853 /* Say where in the source. */
2854 DECL_SOURCE_LOCATION (decl) = location;
2856 ent->binding_level = current_binding_level;
2857 ent->names_in_scope = current_binding_level->names;
2859 for (use = ent->uses; use ; use = use->next)
2860 check_previous_goto (decl, use);
2864 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2869 struct cp_binding_level *level;
2870 struct cp_switch *next;
2871 /* The SWITCH_STMT being built. */
2873 /* A splay-tree mapping the low element of a case range to the high
2874 element, or NULL_TREE if there is no high element. Used to
2875 determine whether or not a new case label duplicates an old case
2876 label. We need a tree, rather than simply a hash table, because
2877 of the GNU case range extension. */
2881 /* A stack of the currently active switch statements. The innermost
2882 switch statement is on the top of the stack. There is no need to
2883 mark the stack for garbage collection because it is only active
2884 during the processing of the body of a function, and we never
2885 collect at that point. */
2887 static struct cp_switch *switch_stack;
2889 /* Called right after a switch-statement condition is parsed.
2890 SWITCH_STMT is the switch statement being parsed. */
2893 push_switch (tree switch_stmt)
2895 struct cp_switch *p = XNEW (struct cp_switch);
2896 p->level = current_binding_level;
2897 p->next = switch_stack;
2898 p->switch_stmt = switch_stmt;
2899 p->cases = splay_tree_new (case_compare, NULL, NULL);
2906 struct cp_switch *cs = switch_stack;
2907 location_t switch_location;
2909 /* Emit warnings as needed. */
2910 switch_location = EXPR_LOC_OR_HERE (cs->switch_stmt);
2911 if (!processing_template_decl)
2912 c_do_switch_warnings (cs->cases, switch_location,
2913 SWITCH_STMT_TYPE (cs->switch_stmt),
2914 SWITCH_STMT_COND (cs->switch_stmt));
2916 splay_tree_delete (cs->cases);
2917 switch_stack = switch_stack->next;
2921 /* Note that we've seen a definition of a case label, and complain if this
2922 is a bad place for one. */
2925 finish_case_label (location_t loc, tree low_value, tree high_value)
2928 struct cp_binding_level *p;
2930 if (processing_template_decl)
2934 /* For templates, just add the case label; we'll do semantic
2935 analysis at instantiation-time. */
2936 label = build_decl (loc, LABEL_DECL, NULL_TREE, NULL_TREE);
2937 return add_stmt (build_case_label (loc, low_value, high_value, label));
2940 /* Find the condition on which this switch statement depends. */
2941 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
2942 if (cond && TREE_CODE (cond) == TREE_LIST)
2943 cond = TREE_VALUE (cond);
2945 if (!check_switch_goto (switch_stack->level))
2946 return error_mark_node;
2949 low_value = cxx_constant_value (low_value);
2951 high_value = cxx_constant_value (high_value);
2953 r = c_add_case_label (loc, switch_stack->cases, cond,
2954 SWITCH_STMT_TYPE (switch_stack->switch_stmt),
2955 low_value, high_value);
2957 /* After labels, make any new cleanups in the function go into their
2958 own new (temporary) binding contour. */
2959 for (p = current_binding_level;
2960 p->kind != sk_function_parms;
2962 p->more_cleanups_ok = 0;
2967 /* Hash a TYPENAME_TYPE. K is really of type `tree'. */
2970 typename_hash (const void* k)
2973 const_tree const t = (const_tree) k;
2975 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
2976 ^ htab_hash_pointer (DECL_NAME (TYPE_NAME (t))));
2981 typedef struct typename_info {
2989 /* Compare two TYPENAME_TYPEs. K1 is really of type `tree', K2 is
2990 really of type `typename_info*' */
2993 typename_compare (const void * k1, const void * k2)
2995 const_tree const t1 = (const_tree) k1;
2996 const typename_info *const t2 = (const typename_info *) k2;
2998 return (DECL_NAME (TYPE_NAME (t1)) == t2->name
2999 && TYPE_CONTEXT (t1) == t2->scope
3000 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
3001 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
3002 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
3005 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
3006 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
3008 Returns the new TYPENAME_TYPE. */
3010 static GTY ((param_is (union tree_node))) htab_t typename_htab;
3013 build_typename_type (tree context, tree name, tree fullname,
3014 enum tag_types tag_type)
3022 if (typename_htab == NULL)
3023 typename_htab = htab_create_ggc (61, &typename_hash,
3024 &typename_compare, NULL);
3026 ti.scope = FROB_CONTEXT (context);
3028 ti.template_id = fullname;
3029 ti.enum_p = tag_type == enum_type;
3030 ti.class_p = (tag_type == class_type
3031 || tag_type == record_type
3032 || tag_type == union_type);
3033 hash = (htab_hash_pointer (ti.scope)
3034 ^ htab_hash_pointer (ti.name));
3036 /* See if we already have this type. */
3037 e = htab_find_slot_with_hash (typename_htab, &ti, hash, INSERT);
3042 /* Build the TYPENAME_TYPE. */
3043 t = cxx_make_type (TYPENAME_TYPE);
3044 TYPE_CONTEXT (t) = ti.scope;
3045 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
3046 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
3047 TYPENAME_IS_CLASS_P (t) = ti.class_p;
3049 /* Build the corresponding TYPE_DECL. */
3050 d = build_decl (input_location, TYPE_DECL, name, t);
3051 TYPE_NAME (TREE_TYPE (d)) = d;
3052 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3053 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3054 DECL_ARTIFICIAL (d) = 1;
3056 /* Store it in the hash table. */
3059 /* TYPENAME_TYPEs must always be compared structurally, because
3060 they may or may not resolve down to another type depending on
3061 the currently open classes. */
3062 SET_TYPE_STRUCTURAL_EQUALITY (t);
3068 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
3069 provided to name the type. Returns an appropriate type, unless an
3070 error occurs, in which case error_mark_node is returned. If we
3071 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
3072 return that, rather than the _TYPE it corresponds to, in other
3073 cases we look through the type decl. If TF_ERROR is set, complain
3074 about errors, otherwise be quiet. */
3077 make_typename_type (tree context, tree name, enum tag_types tag_type,
3078 tsubst_flags_t complain)
3084 if (name == error_mark_node
3085 || context == NULL_TREE
3086 || context == error_mark_node)
3087 return error_mark_node;
3091 if (!(TYPE_LANG_SPECIFIC (name)
3092 && (CLASSTYPE_IS_TEMPLATE (name)
3093 || CLASSTYPE_USE_TEMPLATE (name))))
3094 name = TYPE_IDENTIFIER (name);
3096 /* Create a TEMPLATE_ID_EXPR for the type. */
3097 name = build_nt (TEMPLATE_ID_EXPR,
3098 CLASSTYPE_TI_TEMPLATE (name),
3099 CLASSTYPE_TI_ARGS (name));
3101 else if (TREE_CODE (name) == TYPE_DECL)
3102 name = DECL_NAME (name);
3106 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
3108 name = TREE_OPERAND (name, 0);
3109 if (TREE_CODE (name) == TEMPLATE_DECL)
3110 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
3111 else if (TREE_CODE (name) == OVERLOAD)
3113 error ("%qD is not a type", name);
3114 return error_mark_node;
3117 if (TREE_CODE (name) == TEMPLATE_DECL)
3119 error ("%qD used without template parameters", name);
3120 return error_mark_node;
3122 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3123 gcc_assert (TYPE_P (context));
3125 if (!MAYBE_CLASS_TYPE_P (context))
3127 if (complain & tf_error)
3128 error ("%q#T is not a class", context);
3129 return error_mark_node;
3132 /* When the CONTEXT is a dependent type, NAME could refer to a
3133 dependent base class of CONTEXT. But look inside it anyway
3134 if CONTEXT is a currently open scope, in case it refers to a
3135 member of the current instantiation or a non-dependent base;
3136 lookup will stop when we hit a dependent base. */
3137 if (!dependent_scope_p (context))
3138 /* We should only set WANT_TYPE when we're a nested typename type.
3139 Then we can give better diagnostics if we find a non-type. */
3140 t = lookup_field (context, name, 2, /*want_type=*/true);
3144 if ((!t || TREE_CODE (t) == TREE_LIST) && dependent_type_p (context))
3145 return build_typename_type (context, name, fullname, tag_type);
3147 want_template = TREE_CODE (fullname) == TEMPLATE_ID_EXPR;
3151 if (complain & tf_error)
3152 error (want_template ? "no class template named %q#T in %q#T"
3153 : "no type named %q#T in %q#T", name, context);
3154 return error_mark_node;
3157 /* Pull out the template from an injected-class-name (or multiple). */
3159 t = maybe_get_template_decl_from_type_decl (t);
3161 if (TREE_CODE (t) == TREE_LIST)
3163 if (complain & tf_error)
3165 error ("lookup of %qT in %qT is ambiguous", name, context);
3166 print_candidates (t);
3168 return error_mark_node;
3171 if (want_template && !DECL_CLASS_TEMPLATE_P (t))
3173 if (complain & tf_error)
3174 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3176 return error_mark_node;
3178 if (!want_template && TREE_CODE (t) != TYPE_DECL)
3180 if (complain & tf_error)
3181 error ("%<typename %T::%D%> names %q#T, which is not a type",
3183 return error_mark_node;
3186 if (complain & tf_error)
3187 perform_or_defer_access_check (TYPE_BINFO (context), t, t);
3189 /* If we are currently parsing a template and if T is a typedef accessed
3190 through CONTEXT then we need to remember and check access of T at
3191 template instantiation time. */
3192 add_typedef_to_current_template_for_access_check (t, context, input_location);
3195 return lookup_template_class (t, TREE_OPERAND (fullname, 1),
3197 /*entering_scope=*/0,
3198 tf_warning_or_error | tf_user);
3200 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
3206 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3207 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3208 in which case error_mark_node is returned.
3210 If PARM_LIST is non-NULL, also make sure that the template parameter
3211 list of TEMPLATE_DECL matches.
3213 If COMPLAIN zero, don't complain about any errors that occur. */
3216 make_unbound_class_template (tree context, tree name, tree parm_list,
3217 tsubst_flags_t complain)
3223 name = TYPE_IDENTIFIER (name);
3224 else if (DECL_P (name))
3225 name = DECL_NAME (name);
3226 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3228 if (!dependent_type_p (context)
3229 || currently_open_class (context))
3231 tree tmpl = NULL_TREE;
3233 if (MAYBE_CLASS_TYPE_P (context))
3234 tmpl = lookup_field (context, name, 0, false);
3236 if (tmpl && TREE_CODE (tmpl) == TYPE_DECL)
3237 tmpl = maybe_get_template_decl_from_type_decl (tmpl);
3239 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
3241 if (complain & tf_error)
3242 error ("no class template named %q#T in %q#T", name, context);
3243 return error_mark_node;
3247 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
3249 if (complain & tf_error)
3251 error ("template parameters do not match template");
3252 error ("%q+D declared here", tmpl);
3254 return error_mark_node;
3257 if (complain & tf_error)
3258 perform_or_defer_access_check (TYPE_BINFO (context), tmpl, tmpl);
3263 /* Build the UNBOUND_CLASS_TEMPLATE. */
3264 t = cxx_make_type (UNBOUND_CLASS_TEMPLATE);
3265 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
3266 TREE_TYPE (t) = NULL_TREE;
3267 SET_TYPE_STRUCTURAL_EQUALITY (t);
3269 /* Build the corresponding TEMPLATE_DECL. */
3270 d = build_decl (input_location, TEMPLATE_DECL, name, t);
3271 TYPE_NAME (TREE_TYPE (d)) = d;
3272 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3273 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3274 DECL_ARTIFICIAL (d) = 1;
3275 DECL_TEMPLATE_PARMS (d) = parm_list;
3282 /* Push the declarations of builtin types into the namespace.
3283 RID_INDEX is the index of the builtin type in the array
3284 RID_POINTERS. NAME is the name used when looking up the builtin
3285 type. TYPE is the _TYPE node for the builtin type. */
3288 record_builtin_type (enum rid rid_index,
3292 tree rname = NULL_TREE, tname = NULL_TREE;
3293 tree tdecl = NULL_TREE;
3295 if ((int) rid_index < (int) RID_MAX)
3296 rname = ridpointers[(int) rid_index];
3298 tname = get_identifier (name);
3300 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
3301 eliminated. Built-in types should not be looked up name; their
3302 names are keywords that the parser can recognize. However, there
3303 is code in c-common.c that uses identifier_global_value to look
3304 up built-in types by name. */
3307 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, tname, type);
3308 DECL_ARTIFICIAL (tdecl) = 1;
3309 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
3315 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, rname, type);
3316 DECL_ARTIFICIAL (tdecl) = 1;
3318 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
3321 if (!TYPE_NAME (type))
3322 TYPE_NAME (type) = tdecl;
3325 debug_hooks->type_decl (tdecl, 0);
3328 /* Record one of the standard Java types.
3329 * Declare it as having the given NAME.
3330 * If SIZE > 0, it is the size of one of the integral types;
3331 * otherwise it is the negative of the size of one of the other types. */
3334 record_builtin_java_type (const char* name, int size)
3339 type = build_nonstandard_integer_type (size, 0);
3340 type = build_distinct_type_copy (type);
3342 else if (size > -32)
3345 /* "__java_char" or ""__java_boolean". */
3346 type = build_nonstandard_integer_type (-size, 1);
3347 type = build_distinct_type_copy (type);
3348 /* Get the signed type cached and attached to the unsigned type,
3349 so it doesn't get garbage-collected at "random" times,
3350 causing potential codegen differences out of different UIDs
3351 and different alias set numbers. */
3352 stype = build_nonstandard_integer_type (-size, 0);
3353 stype = build_distinct_type_copy (stype);
3354 TREE_CHAIN (type) = stype;
3355 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
3358 { /* "__java_float" or ""__java_double". */
3359 type = make_node (REAL_TYPE);
3360 TYPE_PRECISION (type) = - size;
3363 record_builtin_type (RID_MAX, name, type);
3364 decl = TYPE_NAME (type);
3366 /* Suppress generate debug symbol entries for these types,
3367 since for normal C++ they are just clutter.
3368 However, push_lang_context undoes this if extern "Java" is seen. */
3369 DECL_IGNORED_P (decl) = 1;
3371 TYPE_FOR_JAVA (type) = 1;
3375 /* Push a type into the namespace so that the back ends ignore it. */
3378 record_unknown_type (tree type, const char* name)
3380 tree decl = pushdecl (build_decl (UNKNOWN_LOCATION,
3381 TYPE_DECL, get_identifier (name), type));
3382 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3383 DECL_IGNORED_P (decl) = 1;
3384 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
3385 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
3386 TYPE_ALIGN (type) = 1;
3387 TYPE_USER_ALIGN (type) = 0;
3388 SET_TYPE_MODE (type, TYPE_MODE (void_type_node));
3391 /* A string for which we should create an IDENTIFIER_NODE at
3394 typedef struct predefined_identifier
3396 /* The name of the identifier. */
3397 const char *const name;
3398 /* The place where the IDENTIFIER_NODE should be stored. */
3400 /* Nonzero if this is the name of a constructor or destructor. */
3401 const int ctor_or_dtor_p;
3402 } predefined_identifier;
3404 /* Create all the predefined identifiers. */
3407 initialize_predefined_identifiers (void)
3409 const predefined_identifier *pid;
3411 /* A table of identifiers to create at startup. */
3412 static const predefined_identifier predefined_identifiers[] = {
3413 { "C++", &lang_name_cplusplus, 0 },
3414 { "C", &lang_name_c, 0 },
3415 { "Java", &lang_name_java, 0 },
3416 /* Some of these names have a trailing space so that it is
3417 impossible for them to conflict with names written by users. */
3418 { "__ct ", &ctor_identifier, 1 },
3419 { "__base_ctor ", &base_ctor_identifier, 1 },
3420 { "__comp_ctor ", &complete_ctor_identifier, 1 },
3421 { "__dt ", &dtor_identifier, 1 },
3422 { "__comp_dtor ", &complete_dtor_identifier, 1 },
3423 { "__base_dtor ", &base_dtor_identifier, 1 },
3424 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
3425 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
3426 { "nelts", &nelts_identifier, 0 },
3427 { THIS_NAME, &this_identifier, 0 },
3428 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
3429 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
3430 { "_vptr", &vptr_identifier, 0 },
3431 { "__vtt_parm", &vtt_parm_identifier, 0 },
3432 { "::", &global_scope_name, 0 },
3433 { "std", &std_identifier, 0 },
3437 for (pid = predefined_identifiers; pid->name; ++pid)
3439 *pid->node = get_identifier (pid->name);
3440 if (pid->ctor_or_dtor_p)
3441 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
3445 /* Create the predefined scalar types of C,
3446 and some nodes representing standard constants (0, 1, (void *)0).
3447 Initialize the global binding level.
3448 Make definitions for built-in primitive functions. */
3451 cxx_init_decl_processing (void)
3454 tree void_ftype_ptr;
3456 build_common_tree_nodes (flag_signed_char);
3458 /* Create all the identifiers we need. */
3459 initialize_predefined_identifiers ();
3461 /* Create the global variables. */
3462 push_to_top_level ();
3464 current_function_decl = NULL_TREE;
3465 current_binding_level = NULL;
3466 /* Enter the global namespace. */
3467 gcc_assert (global_namespace == NULL_TREE);
3468 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
3470 DECL_CONTEXT (global_namespace) = build_translation_unit_decl (NULL_TREE);
3471 TREE_PUBLIC (global_namespace) = 1;
3472 begin_scope (sk_namespace, global_namespace);
3474 current_lang_name = NULL_TREE;
3476 if (flag_visibility_ms_compat)
3477 default_visibility = VISIBILITY_HIDDEN;
3480 current_lang_name = lang_name_c;
3482 /* Create the `std' namespace. */
3483 push_namespace (std_identifier);
3484 std_node = current_namespace;
3487 c_common_nodes_and_builtins ();
3489 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
3490 java_short_type_node = record_builtin_java_type ("__java_short", 16);
3491 java_int_type_node = record_builtin_java_type ("__java_int", 32);
3492 java_long_type_node = record_builtin_java_type ("__java_long", 64);
3493 java_float_type_node = record_builtin_java_type ("__java_float", -32);
3494 java_double_type_node = record_builtin_java_type ("__java_double", -64);
3495 java_char_type_node = record_builtin_java_type ("__java_char", -16);
3496 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
3498 integer_two_node = build_int_cst (NULL_TREE, 2);
3500 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
3501 truthvalue_type_node = boolean_type_node;
3502 truthvalue_false_node = boolean_false_node;
3503 truthvalue_true_node = boolean_true_node;
3505 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
3506 noexcept_true_spec = build_tree_list (boolean_true_node, NULL_TREE);
3507 noexcept_false_spec = build_tree_list (boolean_false_node, NULL_TREE);
3510 record_builtin_type (RID_MAX, NULL, string_type_node);
3513 delta_type_node = ptrdiff_type_node;
3514 vtable_index_type = ptrdiff_type_node;
3516 vtt_parm_type = build_pointer_type (const_ptr_type_node);
3517 void_ftype = build_function_type_list (void_type_node, NULL_TREE);
3518 void_ftype_ptr = build_function_type_list (void_type_node,
3519 ptr_type_node, NULL_TREE);
3521 = build_exception_variant (void_ftype_ptr, empty_except_spec);
3523 /* C++ extensions */
3525 unknown_type_node = make_node (LANG_TYPE);
3526 record_unknown_type (unknown_type_node, "unknown type");
3528 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3529 TREE_TYPE (unknown_type_node) = unknown_type_node;
3531 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3533 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
3534 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
3536 init_list_type_node = make_node (LANG_TYPE);
3537 record_unknown_type (init_list_type_node, "init list");
3540 /* Make sure we get a unique function type, so we can give
3541 its pointer type a name. (This wins for gdb.) */
3542 tree vfunc_type = make_node (FUNCTION_TYPE);
3543 TREE_TYPE (vfunc_type) = integer_type_node;
3544 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
3545 layout_type (vfunc_type);
3547 vtable_entry_type = build_pointer_type (vfunc_type);
3549 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
3552 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
3553 layout_type (vtbl_type_node);
3554 vtbl_type_node = cp_build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
3555 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
3556 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
3557 layout_type (vtbl_ptr_type_node);
3558 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
3560 push_namespace (get_identifier ("__cxxabiv1"));
3561 abi_node = current_namespace;
3564 global_type_node = make_node (LANG_TYPE);
3565 record_unknown_type (global_type_node, "global type");
3568 current_lang_name = lang_name_cplusplus;
3571 tree newtype, deltype;
3572 tree ptr_ftype_sizetype;
3576 = build_function_type_list (ptr_type_node, size_type_node, NULL_TREE);
3577 if (cxx_dialect == cxx98)
3580 tree bad_alloc_type_node;
3581 tree bad_alloc_decl;
3583 push_namespace (std_identifier);
3584 bad_alloc_id = get_identifier ("bad_alloc");
3585 bad_alloc_type_node = make_class_type (RECORD_TYPE);
3586 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3588 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3589 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3593 = add_exception_specifier (NULL_TREE, bad_alloc_type_node, -1);
3596 new_eh_spec = noexcept_false_spec;
3598 newtype = build_exception_variant (ptr_ftype_sizetype, new_eh_spec);
3599 deltype = build_exception_variant (void_ftype_ptr, empty_except_spec);
3600 push_cp_library_fn (NEW_EXPR, newtype);
3601 push_cp_library_fn (VEC_NEW_EXPR, newtype);
3602 global_delete_fndecl = push_cp_library_fn (DELETE_EXPR, deltype);
3603 push_cp_library_fn (VEC_DELETE_EXPR, deltype);
3605 nullptr_type_node = make_node (NULLPTR_TYPE);
3606 TYPE_SIZE (nullptr_type_node) = bitsize_int (GET_MODE_BITSIZE (ptr_mode));
3607 TYPE_SIZE_UNIT (nullptr_type_node) = size_int (GET_MODE_SIZE (ptr_mode));
3608 TYPE_UNSIGNED (nullptr_type_node) = 1;
3609 TYPE_PRECISION (nullptr_type_node) = GET_MODE_BITSIZE (ptr_mode);
3610 SET_TYPE_MODE (nullptr_type_node, Pmode);
3611 record_builtin_type (RID_MAX, "decltype(nullptr)", nullptr_type_node);
3612 nullptr_node = build_int_cst (nullptr_type_node, 0);
3616 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype);
3618 /* Perform other language dependent initializations. */
3619 init_class_processing ();
3620 init_rtti_processing ();
3621 init_template_processing ();
3623 if (flag_exceptions)
3624 init_exception_processing ();
3626 if (! supports_one_only ())
3629 make_fname_decl = cp_make_fname_decl;
3630 start_fname_decls ();
3632 /* Show we use EH for cleanups. */
3633 if (flag_exceptions)
3634 using_eh_for_cleanups ();
3637 /* Generate an initializer for a function naming variable from
3638 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
3639 filled in with the type of the init. */
3642 cp_fname_init (const char* name, tree *type_p)
3644 tree domain = NULL_TREE;
3646 tree init = NULL_TREE;
3651 length = strlen (name);
3652 domain = build_index_type (size_int (length));
3653 init = build_string (length + 1, name);
3656 type = cp_build_qualified_type (char_type_node, TYPE_QUAL_CONST);
3657 type = build_cplus_array_type (type, domain);
3662 TREE_TYPE (init) = type;
3664 init = error_mark_node;
3669 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
3670 the decl, LOC is the location to give the decl, NAME is the
3671 initialization string and TYPE_DEP indicates whether NAME depended
3672 on the type of the function. We make use of that to detect
3673 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
3674 at the point of first use, so we mustn't push the decl now. */
3677 cp_make_fname_decl (location_t loc, tree id, int type_dep)
3679 const char *const name = (type_dep && processing_template_decl
3680 ? NULL : fname_as_string (type_dep));
3682 tree init = cp_fname_init (name, &type);
3683 tree decl = build_decl (loc, VAR_DECL, id, type);
3686 free (CONST_CAST (char *, name));
3688 /* As we're using pushdecl_with_scope, we must set the context. */
3689 DECL_CONTEXT (decl) = current_function_decl;
3690 DECL_PRETTY_FUNCTION_P (decl) = type_dep;
3692 TREE_STATIC (decl) = 1;
3693 TREE_READONLY (decl) = 1;
3694 DECL_ARTIFICIAL (decl) = 1;
3696 TREE_USED (decl) = 1;
3698 if (current_function_decl)
3700 struct cp_binding_level *b = current_binding_level;
3701 if (b->kind == sk_function_parms)
3702 return error_mark_node;
3703 while (b->level_chain->kind != sk_function_parms)
3705 pushdecl_with_scope (decl, b, /*is_friend=*/false);
3706 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, NULL_TREE,
3707 LOOKUP_ONLYCONVERTING);
3711 DECL_THIS_STATIC (decl) = true;
3712 pushdecl_top_level_and_finish (decl, init);
3719 builtin_function_1 (tree decl, tree context, bool is_global)
3721 tree id = DECL_NAME (decl);
3722 const char *name = IDENTIFIER_POINTER (id);
3724 retrofit_lang_decl (decl);
3726 DECL_ARTIFICIAL (decl) = 1;
3727 SET_OVERLOADED_OPERATOR_CODE (decl, ERROR_MARK);
3728 SET_DECL_LANGUAGE (decl, lang_c);
3729 /* Runtime library routines are, by definition, available in an
3730 external shared object. */
3731 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
3732 DECL_VISIBILITY_SPECIFIED (decl) = 1;
3734 DECL_CONTEXT (decl) = context;
3737 pushdecl_top_level (decl);
3741 /* A function in the user's namespace should have an explicit
3742 declaration before it is used. Mark the built-in function as
3743 anticipated but not actually declared. */
3744 if (name[0] != '_' || name[1] != '_')
3745 DECL_ANTICIPATED (decl) = 1;
3746 else if (strncmp (name + 2, "builtin_", strlen ("builtin_")) != 0)
3748 size_t len = strlen (name);
3750 /* Treat __*_chk fortification functions as anticipated as well,
3751 unless they are __builtin_*. */
3752 if (len > strlen ("___chk")
3753 && memcmp (name + len - strlen ("_chk"),
3754 "_chk", strlen ("_chk") + 1) == 0)
3755 DECL_ANTICIPATED (decl) = 1;
3762 cxx_builtin_function (tree decl)
3764 tree id = DECL_NAME (decl);
3765 const char *name = IDENTIFIER_POINTER (id);
3766 /* All builtins that don't begin with an '_' should additionally
3767 go in the 'std' namespace. */
3770 tree decl2 = copy_node(decl);
3771 push_namespace (std_identifier);
3772 builtin_function_1 (decl2, std_node, false);
3776 return builtin_function_1 (decl, NULL_TREE, false);
3779 /* Like cxx_builtin_function, but guarantee the function is added to the global
3780 scope. This is to allow function specific options to add new machine
3781 dependent builtins when the target ISA changes via attribute((target(...)))
3782 which saves space on program startup if the program does not use non-generic
3786 cxx_builtin_function_ext_scope (tree decl)
3789 tree id = DECL_NAME (decl);
3790 const char *name = IDENTIFIER_POINTER (id);
3791 /* All builtins that don't begin with an '_' should additionally
3792 go in the 'std' namespace. */
3795 tree decl2 = copy_node(decl);
3796 push_namespace (std_identifier);
3797 builtin_function_1 (decl2, std_node, true);
3801 return builtin_function_1 (decl, NULL_TREE, true);
3804 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
3805 function. Not called directly. */
3808 build_library_fn_1 (tree name, enum tree_code operator_code, tree type)
3810 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
3811 DECL_EXTERNAL (fn) = 1;
3812 TREE_PUBLIC (fn) = 1;
3813 DECL_ARTIFICIAL (fn) = 1;
3814 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
3815 SET_DECL_LANGUAGE (fn, lang_c);
3816 /* Runtime library routines are, by definition, available in an
3817 external shared object. */
3818 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
3819 DECL_VISIBILITY_SPECIFIED (fn) = 1;
3823 /* Returns the _DECL for a library function with C linkage.
3824 We assume that such functions never throw; if this is incorrect,
3825 callers should unset TREE_NOTHROW. */
3828 build_library_fn (tree name, tree type)
3830 tree fn = build_library_fn_1 (name, ERROR_MARK, type);
3831 TREE_NOTHROW (fn) = 1;
3835 /* Returns the _DECL for a library function with C++ linkage. */
3838 build_cp_library_fn (tree name, enum tree_code operator_code, tree type)
3840 tree fn = build_library_fn_1 (name, operator_code, type);
3841 TREE_NOTHROW (fn) = TYPE_NOTHROW_P (type);
3842 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
3843 SET_DECL_LANGUAGE (fn, lang_cplusplus);
3847 /* Like build_library_fn, but takes a C string instead of an
3851 build_library_fn_ptr (const char* name, tree type)
3853 return build_library_fn (get_identifier (name), type);
3856 /* Like build_cp_library_fn, but takes a C string instead of an
3860 build_cp_library_fn_ptr (const char* name, tree type)
3862 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type);
3865 /* Like build_library_fn, but also pushes the function so that we will
3866 be able to find it via IDENTIFIER_GLOBAL_VALUE. Also, the function
3867 may throw exceptions listed in RAISES. */
3870 push_library_fn (tree name, tree type, tree raises)
3875 type = build_exception_variant (type, raises);
3877 fn = build_library_fn (name, type);
3878 pushdecl_top_level (fn);
3882 /* Like build_cp_library_fn, but also pushes the function so that it
3883 will be found by normal lookup. */
3886 push_cp_library_fn (enum tree_code operator_code, tree type)
3888 tree fn = build_cp_library_fn (ansi_opname (operator_code),
3895 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
3899 push_void_library_fn (tree name, tree parmtypes)
3901 tree type = build_function_type (void_type_node, parmtypes);
3902 return push_library_fn (name, type, NULL_TREE);
3905 /* Like push_library_fn, but also note that this function throws
3906 and does not return. Used for __throw_foo and the like. */
3909 push_throw_library_fn (tree name, tree type)
3911 tree fn = push_library_fn (name, type, NULL_TREE);
3912 TREE_THIS_VOLATILE (fn) = 1;
3913 TREE_NOTHROW (fn) = 0;
3917 /* When we call finish_struct for an anonymous union, we create
3918 default copy constructors and such. But, an anonymous union
3919 shouldn't have such things; this function undoes the damage to the
3920 anonymous union type T.
3922 (The reason that we create the synthesized methods is that we don't
3923 distinguish `union { int i; }' from `typedef union { int i; } U'.
3924 The first is an anonymous union; the second is just an ordinary
3928 fixup_anonymous_aggr (tree t)
3932 /* Wipe out memory of synthesized methods. */
3933 TYPE_HAS_USER_CONSTRUCTOR (t) = 0;
3934 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
3935 TYPE_HAS_COPY_CTOR (t) = 0;
3936 TYPE_HAS_CONST_COPY_CTOR (t) = 0;
3937 TYPE_HAS_COPY_ASSIGN (t) = 0;
3938 TYPE_HAS_CONST_COPY_ASSIGN (t) = 0;
3940 /* Splice the implicitly generated functions out of the TYPE_METHODS
3942 q = &TYPE_METHODS (t);
3945 if (DECL_ARTIFICIAL (*q))
3946 *q = TREE_CHAIN (*q);
3948 q = &DECL_CHAIN (*q);
3951 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
3952 if (TYPE_METHODS (t))
3954 tree decl = TYPE_MAIN_DECL (t);
3956 if (TREE_CODE (t) != UNION_TYPE)
3957 error_at (DECL_SOURCE_LOCATION (decl),
3958 "an anonymous struct cannot have function members");
3960 error_at (DECL_SOURCE_LOCATION (decl),
3961 "an anonymous union cannot have function members");
3964 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
3965 assignment operators (because they cannot have these methods themselves).
3966 For anonymous unions this is already checked because they are not allowed
3967 in any union, otherwise we have to check it. */
3968 if (TREE_CODE (t) != UNION_TYPE)
3972 for (field = TYPE_FIELDS (t); field; field = DECL_CHAIN (field))
3973 if (TREE_CODE (field) == FIELD_DECL)
3975 type = TREE_TYPE (field);
3976 if (CLASS_TYPE_P (type))
3978 if (TYPE_NEEDS_CONSTRUCTING (type))
3979 error ("member %q+#D with constructor not allowed "
3980 "in anonymous aggregate", field);
3981 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
3982 error ("member %q+#D with destructor not allowed "
3983 "in anonymous aggregate", field);
3984 if (TYPE_HAS_COMPLEX_COPY_ASSIGN (type))
3985 error ("member %q+#D with copy assignment operator "
3986 "not allowed in anonymous aggregate", field);
3992 /* Make sure that a declaration with no declarator is well-formed, i.e.
3993 just declares a tagged type or anonymous union.
3995 Returns the type declared; or NULL_TREE if none. */
3998 check_tag_decl (cp_decl_specifier_seq *declspecs)
4000 int saw_friend = declspecs->specs[(int)ds_friend] != 0;
4001 int saw_typedef = declspecs->specs[(int)ds_typedef] != 0;
4002 /* If a class, struct, or enum type is declared by the DECLSPECS
4003 (i.e, if a class-specifier, enum-specifier, or non-typename
4004 elaborated-type-specifier appears in the DECLSPECS),
4005 DECLARED_TYPE is set to the corresponding type. */
4006 tree declared_type = NULL_TREE;
4007 bool error_p = false;
4009 if (declspecs->multiple_types_p)
4010 error ("multiple types in one declaration");
4011 else if (declspecs->redefined_builtin_type)
4013 if (!in_system_header)
4014 permerror (input_location, "redeclaration of C++ built-in type %qT",
4015 declspecs->redefined_builtin_type);
4020 && TYPE_P (declspecs->type)
4021 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
4022 && MAYBE_CLASS_TYPE_P (declspecs->type))
4023 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
4024 declared_type = declspecs->type;
4025 else if (declspecs->type == error_mark_node)
4027 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
4028 permerror (input_location, "declaration does not declare anything");
4029 /* Check for an anonymous union. */
4030 else if (declared_type && RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type))
4031 && TYPE_ANONYMOUS_P (declared_type))
4033 /* 7/3 In a simple-declaration, the optional init-declarator-list
4034 can be omitted only when declaring a class (clause 9) or
4035 enumeration (7.2), that is, when the decl-specifier-seq contains
4036 either a class-specifier, an elaborated-type-specifier with
4037 a class-key (9.1), or an enum-specifier. In these cases and
4038 whenever a class-specifier or enum-specifier is present in the
4039 decl-specifier-seq, the identifiers in these specifiers are among
4040 the names being declared by the declaration (as class-name,
4041 enum-names, or enumerators, depending on the syntax). In such
4042 cases, and except for the declaration of an unnamed bit-field (9.6),
4043 the decl-specifier-seq shall introduce one or more names into the
4044 program, or shall redeclare a name introduced by a previous
4045 declaration. [Example:
4046 enum { }; // ill-formed
4047 typedef class { }; // ill-formed
4051 error ("missing type-name in typedef-declaration");
4054 /* Anonymous unions are objects, so they can have specifiers. */;
4055 SET_ANON_AGGR_TYPE_P (declared_type);
4057 if (TREE_CODE (declared_type) != UNION_TYPE && !in_system_header)
4058 pedwarn (input_location, OPT_pedantic, "ISO C++ prohibits anonymous structs");
4063 if (declspecs->specs[(int)ds_inline]
4064 || declspecs->specs[(int)ds_virtual])
4065 error ("%qs can only be specified for functions",
4066 declspecs->specs[(int)ds_inline]
4067 ? "inline" : "virtual");
4069 && (!current_class_type
4070 || current_scope () != current_class_type))
4071 error ("%<friend%> can only be specified inside a class");
4072 else if (declspecs->specs[(int)ds_explicit])
4073 error ("%<explicit%> can only be specified for constructors");
4074 else if (declspecs->storage_class)
4075 error ("a storage class can only be specified for objects "
4077 else if (declspecs->specs[(int)ds_const]
4078 || declspecs->specs[(int)ds_volatile]
4079 || declspecs->specs[(int)ds_restrict]
4080 || declspecs->specs[(int)ds_thread])
4081 error ("qualifiers can only be specified for objects "
4083 else if (saw_typedef)
4084 warning (0, "%<typedef%> was ignored in this declaration");
4085 else if (declspecs->specs[(int) ds_constexpr])
4086 error ("%<constexpr%> cannot be used for type declarations");
4089 return declared_type;
4092 /* Called when a declaration is seen that contains no names to declare.
4093 If its type is a reference to a structure, union or enum inherited
4094 from a containing scope, shadow that tag name for the current scope
4095 with a forward reference.
4096 If its type defines a new named structure or union
4097 or defines an enum, it is valid but we need not do anything here.
4098 Otherwise, it is an error.
4100 C++: may have to grok the declspecs to learn about static,
4101 complain for anonymous unions.
4103 Returns the TYPE declared -- or NULL_TREE if none. */
4106 shadow_tag (cp_decl_specifier_seq *declspecs)
4108 tree t = check_tag_decl (declspecs);
4113 if (declspecs->attributes)
4115 warning (0, "attribute ignored in declaration of %q+#T", t);
4116 warning (0, "attribute for %q+#T must follow the %qs keyword",
4117 t, class_key_or_enum_as_string (t));
4121 if (maybe_process_partial_specialization (t) == error_mark_node)
4124 /* This is where the variables in an anonymous union are
4125 declared. An anonymous union declaration looks like:
4127 because there is no declarator after the union, the parser
4128 sends that declaration here. */
4129 if (ANON_AGGR_TYPE_P (t))
4131 fixup_anonymous_aggr (t);
4133 if (TYPE_FIELDS (t))
4135 tree decl = grokdeclarator (/*declarator=*/NULL,
4136 declspecs, NORMAL, 0, NULL);
4137 finish_anon_union (decl);
4144 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4147 groktypename (cp_decl_specifier_seq *type_specifiers,
4148 const cp_declarator *declarator,
4149 bool is_template_arg)
4153 enum decl_context context
4154 = is_template_arg ? TEMPLATE_TYPE_ARG : TYPENAME;
4155 attrs = type_specifiers->attributes;
4156 type_specifiers->attributes = NULL_TREE;
4157 type = grokdeclarator (declarator, type_specifiers, context, 0, &attrs);
4158 if (attrs && type != error_mark_node)
4160 if (CLASS_TYPE_P (type))
4161 warning (OPT_Wattributes, "ignoring attributes applied to class type %qT "
4162 "outside of definition", type);
4163 else if (MAYBE_CLASS_TYPE_P (type))
4164 /* A template type parameter or other dependent type. */
4165 warning (OPT_Wattributes, "ignoring attributes applied to dependent "
4166 "type %qT without an associated declaration", type);
4168 cplus_decl_attributes (&type, attrs, 0);
4173 /* Process a DECLARATOR for a function-scope variable declaration,
4174 namespace-scope variable declaration, or function declaration.
4175 (Function definitions go through start_function; class member
4176 declarations appearing in the body of the class go through
4177 grokfield.) The DECL corresponding to the DECLARATOR is returned.
4178 If an error occurs, the error_mark_node is returned instead.
4180 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
4181 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
4182 for an explicitly defaulted function, or SD_DELETED for an explicitly
4183 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
4184 implicitly initialized via a default constructor. ATTRIBUTES and
4185 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
4186 *PUSHED_SCOPE_P is set to the scope entered in this function, if any; if
4187 set, the caller is responsible for calling pop_scope. */
4190 start_decl (const cp_declarator *declarator,
4191 cp_decl_specifier_seq *declspecs,
4194 tree prefix_attributes,
4195 tree *pushed_scope_p)
4203 *pushed_scope_p = NULL_TREE;
4205 /* An object declared as __attribute__((deprecated)) suppresses
4206 warnings of uses of other deprecated items. */
4207 if (lookup_attribute ("deprecated", attributes))
4208 deprecated_state = DEPRECATED_SUPPRESS;
4210 attributes = chainon (attributes, prefix_attributes);
4212 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
4215 deprecated_state = DEPRECATED_NORMAL;
4217 if (decl == NULL_TREE || TREE_CODE (decl) == VOID_TYPE
4218 || decl == error_mark_node)
4219 return error_mark_node;
4221 context = CP_DECL_CONTEXT (decl);
4222 if (context != global_namespace)
4223 *pushed_scope_p = push_scope (context);
4226 /* Is it valid for this decl to have an initializer at all?
4227 If not, set INITIALIZED to zero, which will indirectly
4228 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4229 switch (TREE_CODE (decl))
4232 error ("typedef %qD is initialized (use decltype instead)", decl);
4233 return error_mark_node;
4236 if (initialized == SD_DELETED)
4237 /* We'll handle the rest of the semantics later, but we need to
4238 set this now so it's visible to duplicate_decls. */
4239 DECL_DELETED_FN (decl) = 1;
4248 if (! toplevel_bindings_p ()
4249 && DECL_EXTERNAL (decl))
4250 warning (0, "declaration of %q#D has %<extern%> and is initialized",
4252 DECL_EXTERNAL (decl) = 0;
4253 if (toplevel_bindings_p ())
4254 TREE_STATIC (decl) = 1;
4256 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl)) != 0;
4258 if (alias && TREE_CODE (decl) == FUNCTION_DECL)
4259 record_key_method_defined (decl);
4261 /* If this is a typedef that names the class for linkage purposes
4262 (7.1.3p8), apply any attributes directly to the type. */
4263 if (TREE_CODE (decl) == TYPE_DECL
4264 && TAGGED_TYPE_P (TREE_TYPE (decl))
4265 && decl == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl))))
4266 flags = ATTR_FLAG_TYPE_IN_PLACE;
4270 /* Set attributes here so if duplicate decl, will have proper attributes. */
4271 cplus_decl_attributes (&decl, attributes, flags);
4273 /* Dllimported symbols cannot be defined. Static data members (which
4274 can be initialized in-class and dllimported) go through grokfield,
4275 not here, so we don't need to exclude those decls when checking for
4277 if (initialized && DECL_DLLIMPORT_P (decl))
4279 error ("definition of %q#D is marked %<dllimport%>", decl);
4280 DECL_DLLIMPORT_P (decl) = 0;
4283 /* If #pragma weak was used, mark the decl weak now. */
4284 maybe_apply_pragma_weak (decl);
4286 if (TREE_CODE (decl) == FUNCTION_DECL
4287 && DECL_DECLARED_INLINE_P (decl)
4288 && DECL_UNINLINABLE (decl)
4289 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4290 warning (0, "inline function %q+D given attribute noinline", decl);
4292 if (TYPE_P (context) && COMPLETE_TYPE_P (complete_type (context)))
4294 if (TREE_CODE (decl) == VAR_DECL)
4296 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
4297 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
4298 error ("%q#D is not a static member of %q#T", decl, context);
4301 if (DECL_CONTEXT (field) != context)
4303 if (!same_type_p (DECL_CONTEXT (field), context))
4304 permerror (input_location, "ISO C++ does not permit %<%T::%D%> "
4305 "to be defined as %<%T::%D%>",
4306 DECL_CONTEXT (field), DECL_NAME (decl),
4307 context, DECL_NAME (decl));
4308 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
4310 if (processing_specialization
4311 && template_class_depth (context) == 0
4312 && CLASSTYPE_TEMPLATE_SPECIALIZATION (context))
4313 error ("template header not allowed in member definition "
4314 "of explicitly specialized class");
4315 /* Static data member are tricky; an in-class initialization
4316 still doesn't provide a definition, so the in-class
4317 declaration will have DECL_EXTERNAL set, but will have an
4318 initialization. Thus, duplicate_decls won't warn
4319 about this situation, and so we check here. */
4320 if (initialized && DECL_INITIALIZED_IN_CLASS_P (field))
4321 error ("duplicate initialization of %qD", decl);
4322 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
4324 if (declspecs->specs[(int) ds_constexpr]
4325 && !DECL_DECLARED_CONSTEXPR_P (field))
4326 error ("%qD declared %<constexpr%> outside its class", field);
4331 tree field = check_classfn (context, decl,
4332 (processing_template_decl
4333 > template_class_depth (context))
4334 ? current_template_parms
4336 if (field && field != error_mark_node
4337 && duplicate_decls (decl, field,
4338 /*newdecl_is_friend=*/false))
4342 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
4343 DECL_IN_AGGR_P (decl) = 0;
4344 /* Do not mark DECL as an explicit specialization if it was not
4345 already marked as an instantiation; a declaration should
4346 never be marked as a specialization unless we know what
4347 template is being specialized. */
4348 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
4350 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
4352 /* [temp.expl.spec] An explicit specialization of a static data
4353 member of a template is a definition if the declaration
4354 includes an initializer; otherwise, it is a declaration.
4356 We check for processing_specialization so this only applies
4357 to the new specialization syntax. */
4358 if (!initialized && processing_specialization)
4359 DECL_EXTERNAL (decl) = 1;
4362 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl)
4363 /* Aliases are definitions. */
4365 permerror (input_location, "declaration of %q#D outside of class is not definition",
4369 was_public = TREE_PUBLIC (decl);
4371 /* Enter this declaration into the symbol table. */
4372 decl = maybe_push_decl (decl);
4374 if (processing_template_decl)
4375 decl = push_template_decl (decl);
4376 if (decl == error_mark_node)
4377 return error_mark_node;
4379 /* Tell the back end to use or not use .common as appropriate. If we say
4380 -fconserve-space, we want this to save .data space, at the expense of
4381 wrong semantics. If we say -fno-conserve-space, we want this to
4382 produce errors about redefs; to do this we force variables into the
4384 if (flag_conserve_space
4385 && TREE_CODE (decl) == VAR_DECL
4386 && TREE_PUBLIC (decl)
4387 && !DECL_THREAD_LOCAL_P (decl)
4388 && !have_global_bss_p ())
4389 DECL_COMMON (decl) = 1;
4391 if (TREE_CODE (decl) == VAR_DECL
4392 && DECL_NAMESPACE_SCOPE_P (decl) && !TREE_PUBLIC (decl) && !was_public
4393 && !DECL_THIS_STATIC (decl) && !DECL_ARTIFICIAL (decl))
4395 /* This is a const variable with implicit 'static'. Set
4396 DECL_THIS_STATIC so we can tell it from variables that are
4397 !TREE_PUBLIC because of the anonymous namespace. */
4398 gcc_assert (CP_TYPE_CONST_P (TREE_TYPE (decl)) || errorcount);
4399 DECL_THIS_STATIC (decl) = 1;
4402 if (!processing_template_decl && TREE_CODE (decl) == VAR_DECL)
4403 start_decl_1 (decl, initialized);
4408 /* Process the declaration of a variable DECL. INITIALIZED is true
4409 iff DECL is explicitly initialized. (INITIALIZED is false if the
4410 variable is initialized via an implicitly-called constructor.)
4411 This function must be called for ordinary variables (including, for
4412 example, implicit instantiations of templates), but must not be
4413 called for template declarations. */
4416 start_decl_1 (tree decl, bool initialized)
4420 bool aggregate_definition_p;
4422 gcc_assert (!processing_template_decl);
4424 if (error_operand_p (decl))
4427 gcc_assert (TREE_CODE (decl) == VAR_DECL);
4429 type = TREE_TYPE (decl);
4430 complete_p = COMPLETE_TYPE_P (type);
4431 aggregate_definition_p = MAYBE_CLASS_TYPE_P (type) && !DECL_EXTERNAL (decl);
4433 /* If an explicit initializer is present, or if this is a definition
4434 of an aggregate, then we need a complete type at this point.
4435 (Scalars are always complete types, so there is nothing to
4436 check.) This code just sets COMPLETE_P; errors (if necessary)
4437 are issued below. */
4438 if ((initialized || aggregate_definition_p)
4440 && COMPLETE_TYPE_P (complete_type (type)))
4443 /* We will not yet have set TREE_READONLY on DECL if the type
4444 was "const", but incomplete, before this point. But, now, we
4445 have a complete type, so we can try again. */
4446 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
4450 /* Is it valid for this decl to have an initializer at all? */
4452 /* Don't allow initializations for incomplete types except for
4453 arrays which might be completed by the initialization. */
4455 ; /* A complete type is ok. */
4456 else if (type_uses_auto (type))
4457 ; /* An auto type is ok. */
4458 else if (TREE_CODE (type) != ARRAY_TYPE)
4460 error ("variable %q#D has initializer but incomplete type", decl);
4461 type = TREE_TYPE (decl) = error_mark_node;
4463 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4465 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
4466 error ("elements of array %q#D have incomplete type", decl);
4467 /* else we already gave an error in start_decl. */
4470 else if (aggregate_definition_p && !complete_p)
4472 if (type_uses_auto (type))
4473 error ("declaration of %q#D has no initializer", decl);
4475 error ("aggregate %q#D has incomplete type and cannot be defined",
4477 /* Change the type so that assemble_variable will give
4478 DECL an rtl we can live with: (mem (const_int 0)). */
4479 type = TREE_TYPE (decl) = error_mark_node;
4482 /* Create a new scope to hold this declaration if necessary.
4483 Whether or not a new scope is necessary cannot be determined
4484 until after the type has been completed; if the type is a
4485 specialization of a class template it is not until after
4486 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
4487 will be set correctly. */
4488 maybe_push_cleanup_level (type);
4491 /* Handle initialization of references. DECL, TYPE, and INIT have the
4492 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
4493 but will be set to a new CLEANUP_STMT if a temporary is created
4494 that must be destroyed subsequently.
4496 Returns an initializer expression to use to initialize DECL, or
4497 NULL if the initialization can be performed statically.
4499 Quotes on semantics can be found in ARM 8.4.3. */
4502 grok_reference_init (tree decl, tree type, tree init, tree *cleanup)
4506 if (init == NULL_TREE)
4508 if ((DECL_LANG_SPECIFIC (decl) == 0
4509 || DECL_IN_AGGR_P (decl) == 0)
4510 && ! DECL_THIS_EXTERN (decl))
4511 error ("%qD declared as reference but not initialized", decl);
4515 if (TREE_CODE (init) == TREE_LIST)
4516 init = build_x_compound_expr_from_list (init, ELK_INIT,
4517 tf_warning_or_error);
4519 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
4520 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
4521 /* Note: default conversion is only called in very special cases. */
4522 init = decay_conversion (init);
4524 /* Convert INIT to the reference type TYPE. This may involve the
4525 creation of a temporary, whose lifetime must be the same as that
4526 of the reference. If so, a DECL_EXPR for the temporary will be
4527 added just after the DECL_EXPR for DECL. That's why we don't set
4528 DECL_INITIAL for local references (instead assigning to them
4529 explicitly); we need to allow the temporary to be initialized
4531 tmp = initialize_reference (type, init, decl, cleanup, tf_warning_or_error);
4533 if (tmp == error_mark_node)
4535 else if (tmp == NULL_TREE)
4537 error ("cannot initialize %qT from %qT", type, TREE_TYPE (init));
4541 if (TREE_STATIC (decl) && !TREE_CONSTANT (tmp))
4544 DECL_INITIAL (decl) = tmp;
4549 /* Subroutine of check_initializer. We're initializing a DECL of
4550 std::initializer_list<T> TYPE from a braced-init-list INIT, and need to
4551 extend the lifetime of the underlying array to match that of the decl,
4552 just like for reference initialization. CLEANUP is as for
4553 grok_reference_init. */
4556 build_init_list_var_init (tree decl, tree type, tree init, tree *array_init,
4559 tree aggr_init, array, arrtype;
4560 init = perform_implicit_conversion (type, init, tf_warning_or_error);
4561 if (error_operand_p (init))
4562 return error_mark_node;
4564 aggr_init = TARGET_EXPR_INITIAL (init);
4565 array = CONSTRUCTOR_ELT (aggr_init, 0)->value;
4566 arrtype = TREE_TYPE (array);
4568 gcc_assert (TREE_CODE (array) == ADDR_EXPR);
4569 array = TREE_OPERAND (array, 0);
4570 /* If the array is constant, finish_compound_literal already made it a
4571 static variable and we don't need to do anything here. */
4572 if (decl && TREE_CODE (array) == TARGET_EXPR)
4574 tree var = set_up_extended_ref_temp (decl, array, cleanup, array_init);
4575 var = build_address (var);
4576 var = convert (arrtype, var);
4577 CONSTRUCTOR_ELT (aggr_init, 0)->value = var;
4582 /* Designated initializers in arrays are not supported in GNU C++.
4583 The parser cannot detect this error since it does not know whether
4584 a given brace-enclosed initializer is for a class type or for an
4585 array. This function checks that CE does not use a designated
4586 initializer. If it does, an error is issued. Returns true if CE
4587 is valid, i.e., does not have a designated initializer. */
4590 check_array_designated_initializer (const constructor_elt *ce)
4592 /* Designated initializers for array elements are not supported. */
4595 /* The parser only allows identifiers as designated
4597 if (ce->index == error_mark_node)
4598 error ("name used in a GNU-style designated "
4599 "initializer for an array");
4600 else if (TREE_CODE (ce->index) == INTEGER_CST)
4601 /* An index added by reshape_init. */
4605 gcc_assert (TREE_CODE (ce->index) == IDENTIFIER_NODE);
4606 error ("name %qD used in a GNU-style designated "
4607 "initializer for an array", ce->index);
4615 /* When parsing `int a[] = {1, 2};' we don't know the size of the
4616 array until we finish parsing the initializer. If that's the
4617 situation we're in, update DECL accordingly. */
4620 maybe_deduce_size_from_array_init (tree decl, tree init)
4622 tree type = TREE_TYPE (decl);
4624 if (TREE_CODE (type) == ARRAY_TYPE
4625 && TYPE_DOMAIN (type) == NULL_TREE
4626 && TREE_CODE (decl) != TYPE_DECL)
4628 /* do_default is really a C-ism to deal with tentative definitions.
4629 But let's leave it here to ease the eventual merge. */
4630 int do_default = !DECL_EXTERNAL (decl);
4631 tree initializer = init ? init : DECL_INITIAL (decl);
4634 /* Check that there are no designated initializers in INIT, as
4635 those are not supported in GNU C++, and as the middle-end
4636 will crash if presented with a non-numeric designated
4638 if (initializer && TREE_CODE (initializer) == CONSTRUCTOR)
4640 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initializer);
4641 constructor_elt *ce;
4643 FOR_EACH_VEC_ELT (constructor_elt, v, i, ce)
4644 if (!check_array_designated_initializer (ce))
4650 failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
4654 error ("initializer fails to determine size of %qD", decl);
4655 TREE_TYPE (decl) = error_mark_node;
4657 else if (failure == 2)
4661 error ("array size missing in %qD", decl);
4662 TREE_TYPE (decl) = error_mark_node;
4664 /* If a `static' var's size isn't known, make it extern as
4665 well as static, so it does not get allocated. If it's not
4666 `static', then don't mark it extern; finish_incomplete_decl
4667 will give it a default size and it will get allocated. */
4668 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4669 DECL_EXTERNAL (decl) = 1;
4671 else if (failure == 3)
4673 error ("zero-size array %qD", decl);
4674 TREE_TYPE (decl) = error_mark_node;
4678 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
4680 relayout_decl (decl);
4684 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
4685 any appropriate error messages regarding the layout. */
4688 layout_var_decl (tree decl)
4692 type = TREE_TYPE (decl);
4693 if (type == error_mark_node)
4696 /* If we haven't already layed out this declaration, do so now.
4697 Note that we must not call complete type for an external object
4698 because it's type might involve templates that we are not
4699 supposed to instantiate yet. (And it's perfectly valid to say
4700 `extern X x' for some incomplete type `X'.) */
4701 if (!DECL_EXTERNAL (decl))
4702 complete_type (type);
4703 if (!DECL_SIZE (decl)
4704 && TREE_TYPE (decl) != error_mark_node
4705 && (COMPLETE_TYPE_P (type)
4706 || (TREE_CODE (type) == ARRAY_TYPE
4707 && !TYPE_DOMAIN (type)
4708 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
4709 layout_decl (decl, 0);
4711 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
4713 /* An automatic variable with an incomplete type: that is an error.
4714 Don't talk about array types here, since we took care of that
4715 message in grokdeclarator. */
4716 error ("storage size of %qD isn%'t known", decl);
4717 TREE_TYPE (decl) = error_mark_node;
4720 /* Keep this code around in case we later want to control debug info
4721 based on whether a type is "used". (jason 1999-11-11) */
4723 else if (!DECL_EXTERNAL (decl) && MAYBE_CLASS_TYPE_P (ttype))
4724 /* Let debugger know it should output info for this type. */
4725 note_debug_info_needed (ttype);
4727 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4728 note_debug_info_needed (DECL_CONTEXT (decl));
4731 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4732 && DECL_SIZE (decl) != NULL_TREE
4733 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4735 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4736 constant_expression_warning (DECL_SIZE (decl));
4739 error ("storage size of %qD isn%'t constant", decl);
4740 TREE_TYPE (decl) = error_mark_node;
4745 /* If a local static variable is declared in an inline function, or if
4746 we have a weak definition, we must endeavor to create only one
4747 instance of the variable at link-time. */
4750 maybe_commonize_var (tree decl)
4752 /* Static data in a function with comdat linkage also has comdat
4754 if (TREE_STATIC (decl)
4755 /* Don't mess with __FUNCTION__. */
4756 && ! DECL_ARTIFICIAL (decl)
4757 && DECL_FUNCTION_SCOPE_P (decl)
4758 && vague_linkage_p (DECL_CONTEXT (decl)))
4762 /* With weak symbols, we simply make the variable COMDAT;
4763 that will cause copies in multiple translations units to
4765 comdat_linkage (decl);
4769 if (DECL_INITIAL (decl) == NULL_TREE
4770 || DECL_INITIAL (decl) == error_mark_node)
4772 /* Without weak symbols, we can use COMMON to merge
4773 uninitialized variables. */
4774 TREE_PUBLIC (decl) = 1;
4775 DECL_COMMON (decl) = 1;
4779 /* While for initialized variables, we must use internal
4780 linkage -- which means that multiple copies will not
4782 TREE_PUBLIC (decl) = 0;
4783 DECL_COMMON (decl) = 0;
4784 warning_at (input_location, 0,
4785 "sorry: semantics of inline function static "
4786 "data %q+#D are wrong (you%'ll wind up "
4787 "with multiple copies)", decl);
4788 warning_at (DECL_SOURCE_LOCATION (decl), 0,
4789 " you can work around this by removing "
4794 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4795 /* Set it up again; we might have set DECL_INITIAL since the last
4797 comdat_linkage (decl);
4800 /* Issue an error message if DECL is an uninitialized const variable. */
4803 check_for_uninitialized_const_var (tree decl)
4805 tree type = strip_array_types (TREE_TYPE (decl));
4807 /* ``Unless explicitly declared extern, a const object does not have
4808 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4810 if (TREE_CODE (decl) == VAR_DECL
4811 && TREE_CODE (type) != REFERENCE_TYPE
4812 && CP_TYPE_CONST_P (type)
4813 && (!TYPE_NEEDS_CONSTRUCTING (type)
4814 || !type_has_user_provided_default_constructor (type))
4815 && !DECL_INITIAL (decl))
4817 permerror (DECL_SOURCE_LOCATION (decl),
4818 "uninitialized const %qD", decl);
4820 if (CLASS_TYPE_P (type)
4821 && !type_has_user_provided_default_constructor (type))
4823 tree defaulted_ctor;
4825 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (type)),
4826 "%q#T has no user-provided default constructor", type);
4827 defaulted_ctor = in_class_defaulted_default_constructor (type);
4829 inform (DECL_SOURCE_LOCATION (defaulted_ctor),
4830 "constructor is not user-provided because it is "
4831 "explicitly defaulted in the class body");
4836 /* Structure holding the current initializer being processed by reshape_init.
4837 CUR is a pointer to the current element being processed, END is a pointer
4838 after the last element present in the initializer. */
4839 typedef struct reshape_iterator_t
4841 constructor_elt *cur;
4842 constructor_elt *end;
4845 static tree reshape_init_r (tree, reshape_iter *, bool);
4847 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4848 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4849 initialized. If there are no more such fields, the return value
4853 next_initializable_field (tree field)
4856 && (TREE_CODE (field) != FIELD_DECL
4857 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4858 || DECL_ARTIFICIAL (field)))
4859 field = DECL_CHAIN (field);
4864 /* Subroutine of reshape_init_array and reshape_init_vector, which does
4865 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
4866 INTEGER_CST representing the size of the array minus one (the maximum index),
4867 or NULL_TREE if the array was declared without specifying the size. D is
4868 the iterator within the constructor. */
4871 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d)
4874 bool sized_array_p = (max_index != NULL_TREE);
4875 unsigned HOST_WIDE_INT max_index_cst = 0;
4876 unsigned HOST_WIDE_INT index;
4878 /* The initializer for an array is always a CONSTRUCTOR. */
4879 new_init = build_constructor (init_list_type_node, NULL);
4883 /* Minus 1 is used for zero sized arrays. */
4884 if (integer_all_onesp (max_index))
4887 if (host_integerp (max_index, 1))
4888 max_index_cst = tree_low_cst (max_index, 1);
4889 /* sizetype is sign extended, not zero extended. */
4891 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
4895 /* Loop until there are no more initializers. */
4897 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
4902 check_array_designated_initializer (d->cur);
4903 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false);
4904 if (elt_init == error_mark_node)
4905 return error_mark_node;
4906 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init),
4907 size_int (index), elt_init);
4908 if (!TREE_CONSTANT (elt_init))
4909 TREE_CONSTANT (new_init) = false;
4915 /* Subroutine of reshape_init_r, processes the initializers for arrays.
4916 Parameters are the same of reshape_init_r. */
4919 reshape_init_array (tree type, reshape_iter *d)
4921 tree max_index = NULL_TREE;
4923 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
4925 if (TYPE_DOMAIN (type))
4926 max_index = array_type_nelts (type);
4928 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4931 /* Subroutine of reshape_init_r, processes the initializers for vectors.
4932 Parameters are the same of reshape_init_r. */
4935 reshape_init_vector (tree type, reshape_iter *d)
4937 tree max_index = NULL_TREE;
4939 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
4941 if (COMPOUND_LITERAL_P (d->cur->value))
4943 tree value = d->cur->value;
4944 if (!same_type_p (TREE_TYPE (value), type))
4946 error ("invalid type %qT as initializer for a vector of type %qT",
4947 TREE_TYPE (d->cur->value), type);
4948 value = error_mark_node;
4954 /* For a vector, we initialize it as an array of the appropriate size. */
4955 if (TREE_CODE (type) == VECTOR_TYPE)
4956 max_index = size_int (TYPE_VECTOR_SUBPARTS (type) - 1);
4958 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4961 /* Subroutine of reshape_init_r, processes the initializers for classes
4962 or union. Parameters are the same of reshape_init_r. */
4965 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p)
4970 gcc_assert (CLASS_TYPE_P (type));
4972 /* The initializer for a class is always a CONSTRUCTOR. */
4973 new_init = build_constructor (init_list_type_node, NULL);
4974 field = next_initializable_field (TYPE_FIELDS (type));
4980 An initializer for an aggregate member that is an
4981 empty class shall have the form of an empty
4982 initializer-list {}. */
4983 if (!first_initializer_p)
4985 error ("initializer for %qT must be brace-enclosed", type);
4986 return error_mark_node;
4991 /* Loop through the initializable fields, gathering initializers. */
4992 while (d->cur != d->end)
4996 /* Handle designated initializers, as an extension. */
4999 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
5001 if (!field || TREE_CODE (field) != FIELD_DECL)
5003 error ("%qT has no non-static data member named %qD", type,
5005 return error_mark_node;
5009 /* If we processed all the member of the class, we are done. */
5013 field_init = reshape_init_r (TREE_TYPE (field), d,
5014 /*first_initializer_p=*/false);
5015 if (field_init == error_mark_node)
5016 return error_mark_node;
5018 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
5022 When a union is initialized with a brace-enclosed
5023 initializer, the braces shall only contain an
5024 initializer for the first member of the union. */
5025 if (TREE_CODE (type) == UNION_TYPE)
5028 field = next_initializable_field (DECL_CHAIN (field));
5034 /* Subroutine of reshape_init, which processes a single initializer (part of
5035 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
5036 iterator within the CONSTRUCTOR which points to the initializer to process.
5037 FIRST_INITIALIZER_P is true if this is the first initializer of the
5038 outermost CONSTRUCTOR node. */
5041 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p)
5043 tree init = d->cur->value;
5045 if (error_operand_p (init))
5046 return error_mark_node;
5048 /* A non-aggregate type is always initialized with a single
5050 if (!CP_AGGREGATE_TYPE_P (type))
5052 /* It is invalid to initialize a non-aggregate type with a
5053 brace-enclosed initializer before C++0x.
5054 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
5055 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
5056 a CONSTRUCTOR (with a record type). */
5057 if (TREE_CODE (init) == CONSTRUCTOR
5058 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
5060 if (SCALAR_TYPE_P (type))
5062 error ("braces around scalar initializer for type %qT", type);
5063 init = error_mark_node;
5066 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5075 All implicit type conversions (clause _conv_) are considered when
5076 initializing the aggregate member with an initializer from an
5077 initializer-list. If the initializer can initialize a member,
5078 the member is initialized. Otherwise, if the member is itself a
5079 non-empty subaggregate, brace elision is assumed and the
5080 initializer is considered for the initialization of the first
5081 member of the subaggregate. */
5082 if (TREE_CODE (init) != CONSTRUCTOR
5083 /* But don't try this for the first initializer, since that would be
5084 looking through the outermost braces; A a2 = { a1 }; is not a
5085 valid aggregate initialization. */
5086 && !first_initializer_p
5087 && (same_type_ignoring_top_level_qualifiers_p (type, TREE_TYPE (init))
5088 || can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL)))
5094 /* [dcl.init.string]
5096 A char array (whether plain char, signed char, or unsigned char)
5097 can be initialized by a string-literal (optionally enclosed in
5098 braces); a wchar_t array can be initialized by a wide
5099 string-literal (optionally enclosed in braces). */
5100 if (TREE_CODE (type) == ARRAY_TYPE
5101 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
5103 tree str_init = init;
5105 /* Strip one level of braces if and only if they enclose a single
5106 element (as allowed by [dcl.init.string]). */
5107 if (!first_initializer_p
5108 && TREE_CODE (str_init) == CONSTRUCTOR
5109 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (str_init)) == 1)
5111 str_init = VEC_index (constructor_elt,
5112 CONSTRUCTOR_ELTS (str_init), 0)->value;
5115 /* If it's a string literal, then it's the initializer for the array
5116 as a whole. Otherwise, continue with normal initialization for
5117 array types (one value per array element). */
5118 if (TREE_CODE (str_init) == STRING_CST)
5125 /* The following cases are about aggregates. If we are not within a full
5126 initializer already, and there is not a CONSTRUCTOR, it means that there
5127 is a missing set of braces (that is, we are processing the case for
5128 which reshape_init exists). */
5129 if (!first_initializer_p)
5131 if (TREE_CODE (init) == CONSTRUCTOR)
5133 if (TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init)))
5134 /* There is no need to reshape pointer-to-member function
5135 initializers, as they are always constructed correctly
5136 by the front end. */
5138 else if (COMPOUND_LITERAL_P (init))
5139 /* For a nested compound literal, there is no need to reshape since
5140 brace elision is not allowed. Even if we decided to allow it,
5141 we should add a call to reshape_init in finish_compound_literal,
5142 before calling digest_init, so changing this code would still
5143 not be necessary. */
5144 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
5148 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5149 return reshape_init (type, init);
5153 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
5157 /* Dispatch to specialized routines. */
5158 if (CLASS_TYPE_P (type))
5159 return reshape_init_class (type, d, first_initializer_p);
5160 else if (TREE_CODE (type) == ARRAY_TYPE)
5161 return reshape_init_array (type, d);
5162 else if (TREE_CODE (type) == VECTOR_TYPE)
5163 return reshape_init_vector (type, d);
5168 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
5169 brace-enclosed aggregate initializer.
5171 INIT is the CONSTRUCTOR containing the list of initializers describing
5172 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
5173 It may not presently match the shape of the TYPE; for example:
5175 struct S { int a; int b; };
5176 struct S a[] = { 1, 2, 3, 4 };
5178 Here INIT will hold a VEC of four elements, rather than a
5179 VEC of two elements, each itself a VEC of two elements. This
5180 routine transforms INIT from the former form into the latter. The
5181 revised CONSTRUCTOR node is returned. */
5184 reshape_init (tree type, tree init)
5186 VEC(constructor_elt, gc) *v;
5190 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5192 v = CONSTRUCTOR_ELTS (init);
5194 /* An empty constructor does not need reshaping, and it is always a valid
5196 if (VEC_empty (constructor_elt, v))
5199 /* Recurse on this CONSTRUCTOR. */
5200 d.cur = VEC_index (constructor_elt, v, 0);
5201 d.end = d.cur + VEC_length (constructor_elt, v);
5203 new_init = reshape_init_r (type, &d, true);
5204 if (new_init == error_mark_node)
5205 return error_mark_node;
5207 /* Make sure all the element of the constructor were used. Otherwise,
5208 issue an error about exceeding initializers. */
5210 error ("too many initializers for %qT", type);
5215 /* Verify array initializer. Returns true if errors have been reported. */
5218 check_array_initializer (tree decl, tree type, tree init)
5220 tree element_type = TREE_TYPE (type);
5222 /* The array type itself need not be complete, because the
5223 initializer may tell us how many elements are in the array.
5224 But, the elements of the array must be complete. */
5225 if (!COMPLETE_TYPE_P (complete_type (element_type)))
5228 error ("elements of array %q#D have incomplete type", decl);
5230 error ("elements of array %q#T have incomplete type", type);
5233 /* It is not valid to initialize a VLA. */
5235 && ((COMPLETE_TYPE_P (type) && !TREE_CONSTANT (TYPE_SIZE (type)))
5236 || !TREE_CONSTANT (TYPE_SIZE (element_type))))
5239 error ("variable-sized object %qD may not be initialized", decl);
5241 error ("variable-sized compound literal");
5247 /* Subroutine of check_initializer; args are passed down from that function.
5248 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
5251 build_aggr_init_full_exprs (tree decl, tree init, int flags)
5254 int saved_stmts_are_full_exprs_p = 0;
5255 if (building_stmt_tree ())
5257 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5258 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5260 init = build_aggr_init (decl, init, flags, tf_warning_or_error);
5261 if (building_stmt_tree ())
5262 current_stmt_tree ()->stmts_are_full_exprs_p =
5263 saved_stmts_are_full_exprs_p;
5267 /* Verify INIT (the initializer for DECL), and record the
5268 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
5269 grok_reference_init.
5271 If the return value is non-NULL, it is an expression that must be
5272 evaluated dynamically to initialize DECL. */
5275 check_initializer (tree decl, tree init, int flags, tree *cleanup)
5277 tree type = TREE_TYPE (decl);
5278 tree init_code = NULL;
5279 tree extra_init = NULL_TREE;
5282 /* Things that are going to be initialized need to have complete
5284 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
5286 if (type == error_mark_node)
5287 /* We will have already complained. */
5290 if (TREE_CODE (type) == ARRAY_TYPE)
5292 if (check_array_initializer (decl, type, init))
5295 else if (!COMPLETE_TYPE_P (type))
5297 error ("%qD has incomplete type", decl);
5298 TREE_TYPE (decl) = error_mark_node;
5302 /* There is no way to make a variable-sized class type in GNU C++. */
5303 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
5305 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5307 int init_len = VEC_length (constructor_elt, CONSTRUCTOR_ELTS (init));
5308 if (SCALAR_TYPE_P (type))
5312 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5313 init = build_zero_init (type, NULL_TREE, false);
5315 else if (init_len != 1)
5317 error ("scalar object %qD requires one element in initializer",
5319 TREE_TYPE (decl) = error_mark_node;
5325 if (TREE_CODE (decl) == CONST_DECL)
5327 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
5329 DECL_INITIAL (decl) = init;
5331 gcc_assert (init != NULL_TREE);
5334 else if (!init && DECL_REALLY_EXTERN (decl))
5336 else if (TREE_CODE (type) == REFERENCE_TYPE)
5337 init = grok_reference_init (decl, type, init, cleanup);
5338 else if (init || TYPE_NEEDS_CONSTRUCTING (type))
5341 check_for_uninitialized_const_var (decl);
5342 /* Do not reshape constructors of vectors (they don't need to be
5344 else if (BRACE_ENCLOSED_INITIALIZER_P (init))
5346 if (is_std_init_list (type))
5347 init = build_init_list_var_init (decl, type, init,
5348 &extra_init, cleanup);
5349 else if (TYPE_NON_AGGREGATE_CLASS (type))
5351 /* Don't reshape if the class has constructors. */
5352 if (cxx_dialect == cxx98)
5353 error ("in C++98 %qD must be initialized by constructor, "
5357 else if (TREE_CODE (type) == VECTOR_TYPE && TYPE_VECTOR_OPAQUE (type))
5359 error ("opaque vector types cannot be initialized");
5360 init = error_mark_node;
5363 init = reshape_init (type, init);
5366 /* If DECL has an array type without a specific bound, deduce the
5367 array size from the initializer. */
5368 maybe_deduce_size_from_array_init (decl, init);
5369 type = TREE_TYPE (decl);
5370 if (type == error_mark_node)
5373 if (TYPE_NEEDS_CONSTRUCTING (type)
5374 || (CLASS_TYPE_P (type)
5375 && !(init && BRACE_ENCLOSED_INITIALIZER_P (init))))
5377 init_code = build_aggr_init_full_exprs (decl, init, flags);
5379 /* If this is a constexpr initializer, expand_default_init will
5380 have returned an INIT_EXPR rather than a CALL_EXPR. In that
5381 case, pull the initializer back out and pass it down into
5382 store_init_value. */
5383 while (TREE_CODE (init_code) == EXPR_STMT
5384 || TREE_CODE (init_code) == CONVERT_EXPR)
5385 init_code = TREE_OPERAND (init_code, 0);
5386 if (TREE_CODE (init_code) == INIT_EXPR)
5388 init = TREE_OPERAND (init_code, 1);
5389 init_code = NULL_TREE;
5390 /* Don't call digest_init; it's unnecessary and will complain
5391 about aggregate initialization of non-aggregate classes. */
5392 flags |= LOOKUP_ALREADY_DIGESTED;
5394 else if (DECL_DECLARED_CONSTEXPR_P (decl))
5396 /* Declared constexpr, but no suitable initializer; massage
5397 init appropriately so we can pass it into store_init_value
5399 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5400 init = finish_compound_literal (type, init,
5401 tf_warning_or_error);
5402 else if (CLASS_TYPE_P (type)
5403 && (!init || TREE_CODE (init) == TREE_LIST))
5405 init = build_functional_cast (type, init, tf_none);
5406 if (init != error_mark_node)
5407 TARGET_EXPR_DIRECT_INIT_P (init) = true;
5409 init_code = NULL_TREE;
5415 if (init && TREE_CODE (init) != TREE_VEC)
5417 init_code = store_init_value (decl, init, flags);
5418 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
5419 && DECL_INITIAL (decl)
5420 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
5421 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
5422 warning (0, "array %qD initialized by parenthesized string literal %qE",
5423 decl, DECL_INITIAL (decl));
5429 if (CLASS_TYPE_P (core_type = strip_array_types (type))
5430 && (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type)
5431 || CLASSTYPE_REF_FIELDS_NEED_INIT (core_type)))
5432 diagnose_uninitialized_cst_or_ref_member (core_type, /*using_new=*/false,
5435 check_for_uninitialized_const_var (decl);
5438 if (init && init != error_mark_node)
5439 init_code = build2 (INIT_EXPR, type, decl, init);
5442 init_code = add_stmt_to_compound (extra_init, init_code);
5444 if (init_code && DECL_IN_AGGR_P (decl))
5446 static int explained = 0;
5448 if (cxx_dialect < cxx0x)
5449 error ("initializer invalid for static member with constructor");
5451 error ("non-constant in-class initialization invalid for static "
5452 "member %qD", decl);
5455 error ("(an out of class initialization is required)");
5463 /* If DECL is not a local variable, give it RTL. */
5466 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
5468 int toplev = toplevel_bindings_p ();
5470 const char *filename;
5472 /* Set the DECL_ASSEMBLER_NAME for the object. */
5475 /* The `register' keyword, when used together with an
5476 asm-specification, indicates that the variable should be
5477 placed in a particular register. */
5478 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
5480 set_user_assembler_name (decl, asmspec);
5481 DECL_HARD_REGISTER (decl) = 1;
5485 if (TREE_CODE (decl) == FUNCTION_DECL
5486 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
5487 set_builtin_user_assembler_name (decl, asmspec);
5488 set_user_assembler_name (decl, asmspec);
5492 /* Handle non-variables up front. */
5493 if (TREE_CODE (decl) != VAR_DECL)
5495 rest_of_decl_compilation (decl, toplev, at_eof);
5499 /* If we see a class member here, it should be a static data
5501 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
5503 gcc_assert (TREE_STATIC (decl));
5504 /* An in-class declaration of a static data member should be
5505 external; it is only a declaration, and not a definition. */
5506 if (init == NULL_TREE)
5507 gcc_assert (DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl));
5510 /* We don't create any RTL for local variables. */
5511 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5514 /* We defer emission of local statics until the corresponding
5515 DECL_EXPR is expanded. */
5516 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
5518 /* We try to defer namespace-scope static constants so that they are
5519 not emitted into the object file unnecessarily. */
5520 filename = input_filename;
5521 if (!DECL_VIRTUAL_P (decl)
5522 && TREE_READONLY (decl)
5523 && DECL_INITIAL (decl) != NULL_TREE
5524 && DECL_INITIAL (decl) != error_mark_node
5526 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
5528 && !TREE_PUBLIC (decl))
5530 /* Fool with the linkage of static consts according to #pragma
5532 struct c_fileinfo *finfo = get_fileinfo (filename);
5533 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
5535 TREE_PUBLIC (decl) = 1;
5536 DECL_EXTERNAL (decl) = finfo->interface_only;
5541 /* Likewise for template instantiations. */
5542 else if (DECL_LANG_SPECIFIC (decl)
5543 && DECL_IMPLICIT_INSTANTIATION (decl))
5546 /* If we're not deferring, go ahead and assemble the variable. */
5548 rest_of_decl_compilation (decl, toplev, at_eof);
5551 /* walk_tree helper for wrap_temporary_cleanups, below. */
5554 wrap_cleanups_r (tree *stmt_p, int *walk_subtrees, void *data)
5556 if (TYPE_P (*stmt_p))
5562 if (TREE_CODE (*stmt_p) == TARGET_EXPR)
5564 tree guard = (tree)data;
5565 tree tcleanup = TARGET_EXPR_CLEANUP (*stmt_p);
5567 tcleanup = build2 (TRY_CATCH_EXPR, void_type_node, tcleanup, guard);
5568 /* Tell honor_protect_cleanup_actions to handle this as a separate
5570 TRY_CATCH_IS_CLEANUP (tcleanup) = 1;
5572 TARGET_EXPR_CLEANUP (*stmt_p) = tcleanup;
5578 /* We're initializing a local variable which has a cleanup GUARD. If there
5579 are any temporaries used in the initializer INIT of this variable, we
5580 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
5581 variable will be cleaned up properly if one of them throws.
5583 Unfortunately, there's no way to express this properly in terms of
5584 nesting, as the regions for the temporaries overlap the region for the
5585 variable itself; if there are two temporaries, the variable needs to be
5586 the first thing destroyed if either of them throws. However, we only
5587 want to run the variable's cleanup if it actually got constructed. So
5588 we need to guard the temporary cleanups with the variable's cleanup if
5589 they are run on the normal path, but not if they are run on the
5590 exceptional path. We implement this by telling
5591 honor_protect_cleanup_actions to strip the variable cleanup from the
5592 exceptional path. */
5595 wrap_temporary_cleanups (tree init, tree guard)
5597 cp_walk_tree_without_duplicates (&init, wrap_cleanups_r, (void *)guard);
5600 /* Generate code to initialize DECL (a local variable). */
5603 initialize_local_var (tree decl, tree init)
5605 tree type = TREE_TYPE (decl);
5609 gcc_assert (TREE_CODE (decl) == VAR_DECL
5610 || TREE_CODE (decl) == RESULT_DECL);
5611 gcc_assert (!TREE_STATIC (decl));
5613 if (DECL_SIZE (decl) == NULL_TREE)
5615 /* If we used it already as memory, it must stay in memory. */
5616 DECL_INITIAL (decl) = NULL_TREE;
5617 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
5621 if (type == error_mark_node)
5624 /* Compute and store the initial value. */
5625 already_used = TREE_USED (decl) || TREE_USED (type);
5626 if (TREE_USED (type))
5627 DECL_READ_P (decl) = 1;
5629 /* Generate a cleanup, if necessary. */
5630 cleanup = cxx_maybe_build_cleanup (decl);
5632 /* Perform the initialization. */
5635 int saved_stmts_are_full_exprs_p;
5637 /* If we're only initializing a single object, guard the destructors
5638 of any temporaries used in its initializer with its destructor.
5639 This isn't right for arrays because each element initialization is
5640 a full-expression. */
5641 if (cleanup && TREE_CODE (type) != ARRAY_TYPE)
5642 wrap_temporary_cleanups (init, cleanup);
5644 gcc_assert (building_stmt_tree ());
5645 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5646 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5647 finish_expr_stmt (init);
5648 current_stmt_tree ()->stmts_are_full_exprs_p =
5649 saved_stmts_are_full_exprs_p;
5652 /* Set this to 0 so we can tell whether an aggregate which was
5653 initialized was ever used. Don't do this if it has a
5654 destructor, so we don't complain about the 'resource
5655 allocation is initialization' idiom. Now set
5656 attribute((unused)) on types so decls of that type will be
5657 marked used. (see TREE_USED, above.) */
5658 if (TYPE_NEEDS_CONSTRUCTING (type)
5660 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
5661 && DECL_NAME (decl))
5662 TREE_USED (decl) = 0;
5663 else if (already_used)
5664 TREE_USED (decl) = 1;
5667 finish_decl_cleanup (decl, cleanup);
5670 /* DECL is a VAR_DECL for a compiler-generated variable with static
5671 storage duration (like a virtual table) whose initializer is a
5672 compile-time constant. Initialize the variable and provide it to the
5676 initialize_artificial_var (tree decl, VEC(constructor_elt,gc) *v)
5679 gcc_assert (DECL_ARTIFICIAL (decl));
5680 init = build_constructor (TREE_TYPE (decl), v);
5681 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
5682 DECL_INITIAL (decl) = init;
5683 DECL_INITIALIZED_P (decl) = 1;
5684 determine_visibility (decl);
5685 layout_var_decl (decl);
5686 maybe_commonize_var (decl);
5687 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
5690 /* INIT is the initializer for a variable, as represented by the
5691 parser. Returns true iff INIT is value-dependent. */
5694 value_dependent_init_p (tree init)
5696 if (TREE_CODE (init) == TREE_LIST)
5697 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5698 return any_value_dependent_elements_p (init);
5699 else if (TREE_CODE (init) == CONSTRUCTOR)
5700 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5702 VEC(constructor_elt, gc) *elts;
5706 elts = CONSTRUCTOR_ELTS (init);
5707 nelts = VEC_length (constructor_elt, elts);
5708 for (i = 0; i < nelts; ++i)
5709 if (value_dependent_init_p (VEC_index (constructor_elt,
5714 /* It must be a simple expression, e.g., int i = 3; */
5715 return value_dependent_expression_p (init);
5720 /* Finish processing of a declaration;
5721 install its line number and initial value.
5722 If the length of an array type is not known before,
5723 it must be determined now, from the initial value, or it is an error.
5725 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
5726 true, then INIT is an integral constant expression.
5728 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
5729 if the (init) syntax was used. */
5732 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
5733 tree asmspec_tree, int flags)
5737 const char *asmspec = NULL;
5738 int was_readonly = 0;
5739 bool var_definition_p = false;
5740 int saved_processing_template_decl;
5743 if (decl == error_mark_node)
5748 error ("assignment (not initialization) in declaration");
5752 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
5753 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
5754 gcc_assert (TREE_CODE (decl) != PARM_DECL);
5756 type = TREE_TYPE (decl);
5757 if (type == error_mark_node)
5760 /* Assume no cleanup is required. */
5761 cleanup = NULL_TREE;
5762 saved_processing_template_decl = processing_template_decl;
5764 /* If a name was specified, get the string. */
5765 if (global_scope_p (current_binding_level))
5766 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
5767 if (asmspec_tree && asmspec_tree != error_mark_node)
5768 asmspec = TREE_STRING_POINTER (asmspec_tree);
5770 if (current_class_type
5771 && CP_DECL_CONTEXT (decl) == current_class_type
5772 && TYPE_BEING_DEFINED (current_class_type)
5773 && (DECL_INITIAL (decl) || init))
5774 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
5776 auto_node = type_uses_auto (type);
5780 if (init == NULL_TREE)
5782 error ("declaration of %q#D has no initializer", decl);
5783 TREE_TYPE (decl) = error_mark_node;
5787 if (TREE_CODE (d_init) == TREE_LIST)
5788 d_init = build_x_compound_expr_from_list (d_init, ELK_INIT,
5789 tf_warning_or_error);
5790 d_init = resolve_nondeduced_context (d_init);
5791 if (describable_type (d_init))
5793 type = TREE_TYPE (decl) = do_auto_deduction (type, d_init,
5795 if (type == error_mark_node)
5800 if (TREE_CODE (decl) == FUNCTION_DECL
5801 /* For members, defer until finalize_literal_type_property. */
5802 && (!DECL_CLASS_SCOPE_P (decl)
5803 || !TYPE_BEING_DEFINED (DECL_CONTEXT (decl))))
5804 validate_constexpr_fundecl (decl);
5806 else if (!ensure_literal_type_for_constexpr_object (decl))
5807 DECL_DECLARED_CONSTEXPR_P (decl) = 0;
5809 if (init && TREE_CODE (decl) == FUNCTION_DECL)
5812 if (init == ridpointers[(int)RID_DELETE])
5814 /* FIXME check this is 1st decl. */
5815 DECL_DELETED_FN (decl) = 1;
5816 DECL_DECLARED_INLINE_P (decl) = 1;
5817 DECL_INITIAL (decl) = error_mark_node;
5818 FOR_EACH_CLONE (clone, decl)
5820 DECL_DELETED_FN (clone) = 1;
5821 DECL_DECLARED_INLINE_P (clone) = 1;
5822 DECL_INITIAL (clone) = error_mark_node;
5826 else if (init == ridpointers[(int)RID_DEFAULT])
5828 if (defaultable_fn_check (decl))
5829 DECL_DEFAULTED_FN (decl) = 1;
5831 DECL_INITIAL (decl) = NULL_TREE;
5835 if (init && TREE_CODE (decl) == VAR_DECL)
5837 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
5838 if (init_const_expr_p)
5840 /* Set these flags now for templates. We'll update the flags in
5841 store_init_value for instantiations. */
5842 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5843 if (decl_maybe_constant_var_p (decl))
5844 TREE_CONSTANT (decl) = 1;
5848 if (processing_template_decl)
5850 bool type_dependent_p;
5852 /* Add this declaration to the statement-tree. */
5853 if (at_function_scope_p ())
5854 add_decl_expr (decl);
5856 type_dependent_p = dependent_type_p (type);
5858 if (check_for_bare_parameter_packs (init))
5861 DECL_INITIAL (decl) = NULL_TREE;
5864 /* Generally, initializers in templates are expanded when the
5865 template is instantiated. But, if DECL is a variable constant
5866 then it can be used in future constant expressions, so its value
5867 must be available. */
5869 && DECL_CLASS_SCOPE_P (decl)
5870 /* We just set TREE_CONSTANT appropriately; see above. */
5871 && TREE_CONSTANT (decl)
5872 && !type_dependent_p
5873 /* FIXME non-value-dependent constant expression */
5874 && !value_dependent_init_p (init)))
5877 DECL_INITIAL (decl) = init;
5878 if (TREE_CODE (decl) == VAR_DECL
5879 && !DECL_PRETTY_FUNCTION_P (decl)
5880 && !type_dependent_p)
5881 maybe_deduce_size_from_array_init (decl, init);
5885 if (TREE_CODE (init) == TREE_LIST)
5887 /* If the parenthesized-initializer form was used (e.g.,
5888 "int A<N>::i(X)"), then INIT will be a TREE_LIST of initializer
5889 arguments. (There is generally only one.) We convert them
5892 for (; list; list = TREE_CHAIN (list))
5894 tree elt = TREE_VALUE (list);
5895 TREE_VALUE (list) = fold_non_dependent_expr (elt);
5899 init = fold_non_dependent_expr (init);
5900 processing_template_decl = 0;
5903 /* Take care of TYPE_DECLs up front. */
5904 if (TREE_CODE (decl) == TYPE_DECL)
5906 if (type != error_mark_node
5907 && MAYBE_CLASS_TYPE_P (type) && DECL_NAME (decl))
5909 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
5910 warning (0, "shadowing previous type declaration of %q#D", decl);
5911 set_identifier_type_value (DECL_NAME (decl), decl);
5914 /* If we have installed this as the canonical typedef for this
5915 type, and that type has not been defined yet, delay emitting
5916 the debug information for it, as we will emit it later. */
5917 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
5918 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
5919 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
5921 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl),
5926 /* A reference will be modified here, as it is initialized. */
5927 if (! DECL_EXTERNAL (decl)
5928 && TREE_READONLY (decl)
5929 && TREE_CODE (type) == REFERENCE_TYPE)
5932 TREE_READONLY (decl) = 0;
5935 if (TREE_CODE (decl) == VAR_DECL)
5937 /* Only variables with trivial initialization and destruction can
5938 have thread-local storage. */
5939 if (DECL_THREAD_LOCAL_P (decl)
5940 && (type_has_nontrivial_default_init (TREE_TYPE (decl))
5941 || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
5942 error ("%qD cannot be thread-local because it has non-trivial "
5943 "type %qT", decl, TREE_TYPE (decl));
5944 /* If this is a local variable that will need a mangled name,
5945 register it now. We must do this before processing the
5946 initializer for the variable, since the initialization might
5947 require a guard variable, and since the mangled name of the
5948 guard variable will depend on the mangled name of this
5950 if (DECL_FUNCTION_SCOPE_P (decl)
5951 && TREE_STATIC (decl)
5952 && !DECL_ARTIFICIAL (decl))
5954 push_local_name (decl);
5955 if (DECL_CONSTRUCTOR_P (current_function_decl)
5956 || DECL_DESTRUCTOR_P (current_function_decl))
5957 /* Normally local_decls is populated during GIMPLE lowering,
5958 but [cd]tors are never actually compiled directly. We need
5959 to put statics on the list so we can deal with the label
5960 address extension. */
5961 add_local_decl (cfun, decl);
5964 /* Convert the initializer to the type of DECL, if we have not
5965 already initialized DECL. */
5966 if (!DECL_INITIALIZED_P (decl)
5967 /* If !DECL_EXTERNAL then DECL is being defined. In the
5968 case of a static data member initialized inside the
5969 class-specifier, there can be an initializer even if DECL
5970 is *not* defined. */
5971 && (!DECL_EXTERNAL (decl) || init))
5973 if (TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
5976 = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
5977 /* Allow libjava/prims.cc define primitive classes. */
5978 if (init != NULL_TREE
5979 || jclass == NULL_TREE
5980 || TREE_CODE (jclass) != TYPE_DECL
5981 || !POINTER_TYPE_P (TREE_TYPE (jclass))
5982 || !same_type_ignoring_top_level_qualifiers_p
5983 (type, TREE_TYPE (TREE_TYPE (jclass))))
5984 error ("Java object %qD not allocated with %<new%>", decl);
5987 init = check_initializer (decl, init, flags, &cleanup);
5988 /* Thread-local storage cannot be dynamically initialized. */
5989 if (DECL_THREAD_LOCAL_P (decl) && init)
5991 error ("%qD is thread-local and so cannot be dynamically "
5992 "initialized", decl);
5996 /* Check that the initializer for a static data member was a
5997 constant. Although we check in the parser that the
5998 initializer is an integral constant expression, we do not
5999 simplify division-by-zero at the point at which it
6000 occurs. Therefore, in:
6002 struct S { static const int i = 7 / 0; };
6004 we issue an error at this point. It would
6005 probably be better to forbid division by zero in
6006 integral constant expressions. */
6007 if (DECL_EXTERNAL (decl) && init)
6009 error ("%qD cannot be initialized by a non-constant expression"
6010 " when being declared", decl);
6011 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
6019 The memory occupied by any object of static storage
6020 duration is zero-initialized at program startup before
6021 any other initialization takes place.
6023 We cannot create an appropriate initializer until after
6024 the type of DECL is finalized. If DECL_INITIAL is set,
6025 then the DECL is statically initialized, and any
6026 necessary zero-initialization has already been performed. */
6027 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
6028 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
6029 /*nelts=*/NULL_TREE,
6030 /*static_storage_p=*/true);
6031 /* Remember that the initialization for this variable has
6033 DECL_INITIALIZED_P (decl) = 1;
6034 /* This declaration is the definition of this variable,
6035 unless we are initializing a static data member within
6036 the class specifier. */
6037 if (!DECL_EXTERNAL (decl))
6038 var_definition_p = true;
6040 /* If the variable has an array type, lay out the type, even if
6041 there is no initializer. It is valid to index through the
6042 array, and we must get TYPE_ALIGN set correctly on the array
6044 else if (TREE_CODE (type) == ARRAY_TYPE)
6047 if (!processing_template_decl
6048 && TREE_STATIC (decl)
6049 && !at_function_scope_p ()
6050 && current_function_decl == NULL)
6051 /* So decl is a global variable or a static member of a
6052 non local class. Record the types it uses
6053 so that we can decide later to emit debug info for them. */
6054 record_types_used_by_current_var_decl (decl);
6056 else if (TREE_CODE (decl) == FIELD_DECL
6057 && TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6058 error ("non-static data member %qD has Java class type", decl);
6060 /* Add this declaration to the statement-tree. This needs to happen
6061 after the call to check_initializer so that the DECL_EXPR for a
6062 reference temp is added before the DECL_EXPR for the reference itself. */
6063 if (at_function_scope_p ())
6064 add_decl_expr (decl);
6066 /* Let the middle end know about variables and functions -- but not
6067 static data members in uninstantiated class templates. */
6068 if (!saved_processing_template_decl
6069 && (TREE_CODE (decl) == VAR_DECL
6070 || TREE_CODE (decl) == FUNCTION_DECL))
6072 if (TREE_CODE (decl) == VAR_DECL)
6074 layout_var_decl (decl);
6075 maybe_commonize_var (decl);
6078 /* This needs to happen after the linkage is set. */
6079 determine_visibility (decl);
6081 if (var_definition_p && TREE_STATIC (decl))
6083 /* If a TREE_READONLY variable needs initialization
6084 at runtime, it is no longer readonly and we need to
6085 avoid MEM_READONLY_P being set on RTL created for it. */
6088 if (TREE_READONLY (decl))
6089 TREE_READONLY (decl) = 0;
6092 else if (was_readonly)
6093 TREE_READONLY (decl) = 1;
6096 make_rtl_for_nonlocal_decl (decl, init, asmspec);
6098 /* Check for abstractness of the type. Notice that there is no
6099 need to strip array types here since the check for those types
6100 is already done within create_array_type_for_decl. */
6101 if (TREE_CODE (type) == FUNCTION_TYPE
6102 || TREE_CODE (type) == METHOD_TYPE)
6103 abstract_virtuals_error (decl, TREE_TYPE (type));
6105 abstract_virtuals_error (decl, type);
6107 if (TREE_TYPE (decl) == error_mark_node)
6108 /* No initialization required. */
6110 else if (TREE_CODE (decl) == FUNCTION_DECL)
6114 if (init == ridpointers[(int)RID_DEFAULT])
6116 /* An out-of-class default definition is defined at
6117 the point where it is explicitly defaulted. */
6118 if (DECL_DELETED_FN (decl))
6119 maybe_explain_implicit_delete (decl);
6120 else if (DECL_INITIAL (decl) == error_mark_node)
6121 synthesize_method (decl);
6124 error ("function %q#D is initialized like a variable", decl);
6126 /* else no initialization required. */
6128 else if (DECL_EXTERNAL (decl)
6129 && ! (DECL_LANG_SPECIFIC (decl)
6130 && DECL_NOT_REALLY_EXTERN (decl)))
6133 DECL_INITIAL (decl) = init;
6135 /* A variable definition. */
6136 else if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
6137 /* Initialize the local variable. */
6138 initialize_local_var (decl, init);
6140 /* If a variable is defined, and then a subsequent
6141 definition with external linkage is encountered, we will
6142 get here twice for the same variable. We want to avoid
6143 calling expand_static_init more than once. For variables
6144 that are not static data members, we can call
6145 expand_static_init only when we actually process the
6146 initializer. It is not legal to redeclare a static data
6147 member, so this issue does not arise in that case. */
6148 else if (var_definition_p && TREE_STATIC (decl))
6149 expand_static_init (decl, init);
6152 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
6153 reference, insert it in the statement-tree now. */
6155 push_cleanup (decl, cleanup, false);
6158 processing_template_decl = saved_processing_template_decl;
6161 TREE_READONLY (decl) = 1;
6164 /* Returns a declaration for a VAR_DECL as if:
6166 extern "C" TYPE NAME;
6168 had been seen. Used to create compiler-generated global
6172 declare_global_var (tree name, tree type)
6176 push_to_top_level ();
6177 decl = build_decl (input_location, VAR_DECL, name, type);
6178 TREE_PUBLIC (decl) = 1;
6179 DECL_EXTERNAL (decl) = 1;
6180 DECL_ARTIFICIAL (decl) = 1;
6181 /* If the user has explicitly declared this variable (perhaps
6182 because the code we are compiling is part of a low-level runtime
6183 library), then it is possible that our declaration will be merged
6184 with theirs by pushdecl. */
6185 decl = pushdecl (decl);
6186 cp_finish_decl (decl, NULL_TREE, false, NULL_TREE, 0);
6187 pop_from_top_level ();
6192 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
6193 if "__cxa_atexit" is not being used) corresponding to the function
6194 to be called when the program exits. */
6197 get_atexit_fn_ptr_type (void)
6201 if (!atexit_fn_ptr_type_node)
6204 if (flag_use_cxa_atexit
6205 && !targetm.cxx.use_atexit_for_cxa_atexit ())
6206 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
6207 arg_type = ptr_type_node;
6209 /* The parameter to "atexit" is "void (*)(void)". */
6210 arg_type = NULL_TREE;
6212 fn_type = build_function_type_list (void_type_node,
6213 arg_type, NULL_TREE);
6214 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
6217 return atexit_fn_ptr_type_node;
6220 /* Returns a pointer to the `atexit' function. Note that if
6221 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
6222 `__cxa_atexit' function specified in the IA64 C++ ABI. */
6225 get_atexit_node (void)
6231 bool use_aeabi_atexit;
6236 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6238 /* The declaration for `__cxa_atexit' is:
6240 int __cxa_atexit (void (*)(void *), void *, void *)
6242 We build up the argument types and then the function type
6244 tree argtype0, argtype1, argtype2;
6246 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
6247 /* First, build the pointer-to-function type for the first
6249 fn_ptr_type = get_atexit_fn_ptr_type ();
6250 /* Then, build the rest of the argument types. */
6251 argtype2 = ptr_type_node;
6252 if (use_aeabi_atexit)
6254 argtype1 = fn_ptr_type;
6255 argtype0 = ptr_type_node;
6259 argtype1 = ptr_type_node;
6260 argtype0 = fn_ptr_type;
6262 /* And the final __cxa_atexit type. */
6263 fn_type = build_function_type_list (integer_type_node,
6264 argtype0, argtype1, argtype2,
6266 fn_ptr_type = build_pointer_type (fn_type);
6267 if (use_aeabi_atexit)
6268 name = "__aeabi_atexit";
6270 name = "__cxa_atexit";
6274 /* The declaration for `atexit' is:
6276 int atexit (void (*)());
6278 We build up the argument types and then the function type
6280 fn_ptr_type = get_atexit_fn_ptr_type ();
6281 /* Build the final atexit type. */
6282 fn_type = build_function_type_list (integer_type_node,
6283 fn_ptr_type, NULL_TREE);
6287 /* Now, build the function declaration. */
6288 push_lang_context (lang_name_c);
6289 atexit_fndecl = build_library_fn_ptr (name, fn_type);
6290 mark_used (atexit_fndecl);
6291 pop_lang_context ();
6292 atexit_node = decay_conversion (atexit_fndecl);
6297 /* Returns the __dso_handle VAR_DECL. */
6300 get_dso_handle_node (void)
6302 if (dso_handle_node)
6303 return dso_handle_node;
6305 /* Declare the variable. */
6306 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
6309 return dso_handle_node;
6312 /* Begin a new function with internal linkage whose job will be simply
6313 to destroy some particular variable. */
6315 static GTY(()) int start_cleanup_cnt;
6318 start_cleanup_fn (void)
6323 bool use_cxa_atexit = flag_use_cxa_atexit
6324 && !targetm.cxx.use_atexit_for_cxa_atexit ();
6326 push_to_top_level ();
6328 /* No need to mangle this. */
6329 push_lang_context (lang_name_c);
6331 /* Build the name of the function. */
6332 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
6333 /* Build the function declaration. */
6334 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
6335 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
6336 /* It's a function with internal linkage, generated by the
6338 TREE_PUBLIC (fndecl) = 0;
6339 DECL_ARTIFICIAL (fndecl) = 1;
6340 /* Make the function `inline' so that it is only emitted if it is
6341 actually needed. It is unlikely that it will be inlined, since
6342 it is only called via a function pointer, but we avoid unnecessary
6343 emissions this way. */
6344 DECL_DECLARED_INLINE_P (fndecl) = 1;
6345 DECL_INTERFACE_KNOWN (fndecl) = 1;
6346 /* Build the parameter. */
6351 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
6352 DECL_CONTEXT (parmdecl) = fndecl;
6353 TREE_USED (parmdecl) = 1;
6354 DECL_READ_P (parmdecl) = 1;
6355 DECL_ARGUMENTS (fndecl) = parmdecl;
6359 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
6361 pop_lang_context ();
6363 return current_function_decl;
6366 /* Finish the cleanup function begun by start_cleanup_fn. */
6369 end_cleanup_fn (void)
6371 expand_or_defer_fn (finish_function (0));
6373 pop_from_top_level ();
6376 /* Generate code to handle the destruction of DECL, an object with
6377 static storage duration. */
6380 register_dtor_fn (tree decl)
6387 tree arg0, arg1 = NULL_TREE, arg2 = NULL_TREE;
6389 type = TREE_TYPE (decl);
6390 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
6391 return void_zero_node;
6393 /* If we're using "__cxa_atexit" (or "__aeabi_atexit"), and DECL is
6394 a class object, we can just pass the destructor to
6395 "__cxa_atexit"; we don't have to build a temporary function to do
6397 use_dtor = (flag_use_cxa_atexit
6398 && !targetm.cxx.use_atexit_for_cxa_atexit ()
6399 && CLASS_TYPE_P (type));
6404 /* Find the destructor. */
6405 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
6406 gcc_assert (idx >= 0);
6407 cleanup = VEC_index (tree, CLASSTYPE_METHOD_VEC (type), idx);
6408 /* Make sure it is accessible. */
6409 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup);
6413 /* Call build_cleanup before we enter the anonymous function so
6414 that any access checks will be done relative to the current
6415 scope, rather than the scope of the anonymous function. */
6416 build_cleanup (decl);
6418 /* Now start the function. */
6419 cleanup = start_cleanup_fn ();
6421 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
6422 to the original function, rather than the anonymous one. That
6423 will make the back end think that nested functions are in use,
6424 which causes confusion. */
6425 push_deferring_access_checks (dk_no_check);
6426 fcall = build_cleanup (decl);
6427 pop_deferring_access_checks ();
6429 /* Create the body of the anonymous function. */
6430 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
6431 finish_expr_stmt (fcall);
6432 finish_compound_stmt (compound_stmt);
6436 /* Call atexit with the cleanup function. */
6437 mark_used (cleanup);
6438 cleanup = build_address (cleanup);
6439 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6445 /* We must convert CLEANUP to the type that "__cxa_atexit"
6447 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
6448 /* "__cxa_atexit" will pass the address of DECL to the
6449 cleanup function. */
6451 addr = build_address (decl);
6452 /* The declared type of the parameter to "__cxa_atexit" is
6453 "void *". For plain "T*", we could just let the
6454 machinery in cp_build_function_call convert it -- but if the
6455 type is "cv-qualified T *", then we need to convert it
6456 before passing it in, to avoid spurious errors. */
6457 addr = build_nop (ptr_type_node, addr);
6460 /* Since the cleanup functions we build ignore the address
6461 they're given, there's no reason to pass the actual address
6462 in, and, in general, it's cheaper to pass NULL than any
6464 addr = null_pointer_node;
6465 arg2 = cp_build_addr_expr (get_dso_handle_node (),
6466 tf_warning_or_error);
6467 if (targetm.cxx.use_aeabi_atexit ())
6480 return cp_build_function_call_nary (get_atexit_node (), tf_warning_or_error,
6481 arg0, arg1, arg2, NULL_TREE);
6484 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
6485 is its initializer. Generate code to handle the construction
6486 and destruction of DECL. */
6489 expand_static_init (tree decl, tree init)
6491 gcc_assert (TREE_CODE (decl) == VAR_DECL);
6492 gcc_assert (TREE_STATIC (decl));
6494 /* Some variables require no dynamic initialization. */
6496 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
6499 if (DECL_FUNCTION_SCOPE_P (decl))
6501 /* Emit code to perform this initialization but once. */
6502 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
6503 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
6504 tree guard, guard_addr;
6505 tree acquire_fn, release_fn, abort_fn;
6508 /* Emit code to perform this initialization but once. This code
6511 static <type> guard;
6512 if (!guard.first_byte) {
6513 if (__cxa_guard_acquire (&guard)) {
6516 // Do initialization.
6517 flag = true; __cxa_guard_release (&guard);
6518 // Register variable for destruction at end of program.
6520 if (!flag) __cxa_guard_abort (&guard);
6524 Note that the `flag' variable is only set to 1 *after* the
6525 initialization is complete. This ensures that an exception,
6526 thrown during the construction, will cause the variable to
6527 reinitialized when we pass through this code again, as per:
6531 If the initialization exits by throwing an exception, the
6532 initialization is not complete, so it will be tried again
6533 the next time control enters the declaration.
6535 This process should be thread-safe, too; multiple threads
6536 should not be able to initialize the variable more than
6539 /* Create the guard variable. */
6540 guard = get_guard (decl);
6542 /* This optimization isn't safe on targets with relaxed memory
6543 consistency. On such targets we force synchronization in
6544 __cxa_guard_acquire. */
6545 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6547 /* Begin the conditional initialization. */
6548 if_stmt = begin_if_stmt ();
6549 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
6550 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6553 if (flag_threadsafe_statics)
6555 guard_addr = build_address (guard);
6557 acquire_fn = get_identifier ("__cxa_guard_acquire");
6558 release_fn = get_identifier ("__cxa_guard_release");
6559 abort_fn = get_identifier ("__cxa_guard_abort");
6560 if (!get_global_value_if_present (acquire_fn, &acquire_fn))
6562 tree vfntype = build_function_type_list (void_type_node,
6563 TREE_TYPE (guard_addr),
6565 acquire_fn = push_library_fn
6566 (acquire_fn, build_function_type_list (integer_type_node,
6567 TREE_TYPE (guard_addr),
6570 release_fn = push_library_fn (release_fn, vfntype, NULL_TREE);
6571 abort_fn = push_library_fn (abort_fn, vfntype, NULL_TREE);
6575 release_fn = identifier_global_value (release_fn);
6576 abort_fn = identifier_global_value (abort_fn);
6579 inner_if_stmt = begin_if_stmt ();
6580 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
6583 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6584 begin = get_target_expr (boolean_false_node);
6585 flag = TARGET_EXPR_SLOT (begin);
6587 TARGET_EXPR_CLEANUP (begin)
6588 = build3 (COND_EXPR, void_type_node, flag,
6590 build_call_n (abort_fn, 1, guard_addr));
6591 CLEANUP_EH_ONLY (begin) = 1;
6593 /* Do the initialization itself. */
6594 init = add_stmt_to_compound (begin, init);
6595 init = add_stmt_to_compound
6596 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
6597 init = add_stmt_to_compound
6598 (init, build_call_n (release_fn, 1, guard_addr));
6601 init = add_stmt_to_compound (init, set_guard (guard));
6603 /* Use atexit to register a function for destroying this static
6605 init = add_stmt_to_compound (init, register_dtor_fn (decl));
6607 finish_expr_stmt (init);
6609 if (flag_threadsafe_statics)
6611 finish_compound_stmt (inner_then_clause);
6612 finish_then_clause (inner_if_stmt);
6613 finish_if_stmt (inner_if_stmt);
6616 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6618 finish_compound_stmt (then_clause);
6619 finish_then_clause (if_stmt);
6620 finish_if_stmt (if_stmt);
6624 static_aggregates = tree_cons (init, decl, static_aggregates);
6628 /* Make TYPE a complete type based on INITIAL_VALUE.
6629 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
6630 2 if there was no information (in which case assume 0 if DO_DEFAULT),
6631 3 if the initializer list is empty (in pedantic mode). */
6634 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
6637 tree type, elt_type;
6641 unsigned HOST_WIDE_INT i;
6644 /* An array of character type can be initialized from a
6645 brace-enclosed string constant.
6647 FIXME: this code is duplicated from reshape_init. Probably
6648 we should just call reshape_init here? */
6649 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
6650 && TREE_CODE (initial_value) == CONSTRUCTOR
6651 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
6653 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
6654 tree value = VEC_index (constructor_elt, v, 0)->value;
6656 if (TREE_CODE (value) == STRING_CST
6657 && VEC_length (constructor_elt, v) == 1)
6658 initial_value = value;
6661 /* If any of the elements are parameter packs, we can't actually
6662 complete this type now because the array size is dependent. */
6663 if (TREE_CODE (initial_value) == CONSTRUCTOR)
6665 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value),
6668 if (PACK_EXPANSION_P (value))
6674 failure = complete_array_type (ptype, initial_value, do_default);
6676 /* We can create the array before the element type is complete, which
6677 means that we didn't have these two bits set in the original type
6678 either. In completing the type, we are expected to propagate these
6679 bits. See also complete_type which does the same thing for arrays
6682 if (TYPE_DOMAIN (type))
6684 elt_type = TREE_TYPE (type);
6685 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
6686 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
6687 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
6693 /* As above, but either give an error or reject zero-size arrays, depending
6697 cp_complete_array_type_or_error (tree *ptype, tree initial_value,
6698 bool do_default, tsubst_flags_t complain)
6701 bool sfinae = !(complain & tf_error);
6702 /* In SFINAE context we can't be lenient about zero-size arrays. */
6705 failure = cp_complete_array_type (ptype, initial_value, do_default);
6711 /* Not an error. */;
6712 else if (failure == 1)
6713 error ("initializer fails to determine size of %qT", *ptype);
6714 else if (failure == 2)
6717 error ("array size missing in %qT", *ptype);
6719 else if (failure == 3)
6720 error ("zero-size array %qT", *ptype);
6721 *ptype = error_mark_node;
6726 /* Return zero if something is declared to be a member of type
6727 CTYPE when in the context of CUR_TYPE. STRING is the error
6728 message to print in that case. Otherwise, quietly return 1. */
6731 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
6733 if (ctype && ctype != cur_type)
6735 if (flags == DTOR_FLAG)
6736 error ("destructor for alien class %qT cannot be a member", ctype);
6738 error ("constructor for alien class %qT cannot be a member", ctype);
6744 /* Subroutine of `grokdeclarator'. */
6746 /* Generate errors possibly applicable for a given set of specifiers.
6747 This is for ARM $7.1.2. */
6750 bad_specifiers (tree object,
6751 enum bad_spec_place type,
6762 error ("%qD declared as a %<virtual%> variable", object);
6764 error ("%qD declared as an %<inline%> variable", object);
6766 error ("%<const%> and %<volatile%> function specifiers on "
6767 "%qD invalid in variable declaration", object);
6771 error ("%qD declared as a %<virtual%> parameter", object);
6773 error ("%qD declared as an %<inline%> parameter", object);
6775 error ("%<const%> and %<volatile%> function specifiers on "
6776 "%qD invalid in parameter declaration", object);
6780 error ("%qD declared as a %<virtual%> type", object);
6782 error ("%qD declared as an %<inline%> type", object);
6784 error ("%<const%> and %<volatile%> function specifiers on "
6785 "%qD invalid in type declaration", object);
6789 error ("%qD declared as a %<virtual%> field", object);
6791 error ("%qD declared as an %<inline%> field", object);
6793 error ("%<const%> and %<volatile%> function specifiers on "
6794 "%qD invalid in field declaration", object);
6800 error ("%q+D declared as a friend", object);
6802 && (TREE_CODE (object) == TYPE_DECL
6803 || (!TYPE_PTRFN_P (TREE_TYPE (object))
6804 && !TYPE_REFFN_P (TREE_TYPE (object))
6805 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
6806 error ("%q+D declared with an exception specification", object);
6809 /* DECL is a member function or static data member and is presently
6810 being defined. Check that the definition is taking place in a
6814 check_class_member_definition_namespace (tree decl)
6816 /* These checks only apply to member functions and static data
6818 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
6819 || TREE_CODE (decl) == VAR_DECL);
6820 /* We check for problems with specializations in pt.c in
6821 check_specialization_namespace, where we can issue better
6823 if (processing_specialization)
6825 /* There are no restrictions on the placement of
6826 explicit instantiations. */
6827 if (processing_explicit_instantiation)
6831 A member function definition that appears outside of the
6832 class definition shall appear in a namespace scope enclosing
6833 the class definition.
6837 The definition for a static data member shall appear in a
6838 namespace scope enclosing the member's class definition. */
6839 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
6840 permerror (input_location, "definition of %qD is not in namespace enclosing %qT",
6841 decl, DECL_CONTEXT (decl));
6844 /* Build a PARM_DECL for the "this" parameter. TYPE is the
6845 METHOD_TYPE for a non-static member function; QUALS are the
6846 cv-qualifiers that apply to the function. */
6849 build_this_parm (tree type, cp_cv_quals quals)
6854 cp_cv_quals this_quals;
6856 this_type = TREE_VALUE (TYPE_ARG_TYPES (type));
6857 /* The `this' parameter is implicitly `const'; it cannot be
6859 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
6860 qual_type = cp_build_qualified_type (this_type, this_quals);
6861 parm = build_artificial_parm (this_identifier, qual_type);
6862 cp_apply_type_quals_to_decl (this_quals, parm);
6866 /* CTYPE is class type, or null if non-class.
6867 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
6869 DECLARATOR is the function's name.
6870 PARMS is a chain of PARM_DECLs for the function.
6871 VIRTUALP is truthvalue of whether the function is virtual or not.
6872 FLAGS are to be passed through to `grokclassfn'.
6873 QUALS are qualifiers indicating whether the function is `const'
6875 RAISES is a list of exceptions that this function can raise.
6876 CHECK is 1 if we must find this method in CTYPE, 0 if we should
6877 not look, and -1 if we should not call `grokclassfn' at all.
6879 SFK is the kind of special function (if any) for the new function.
6881 Returns `NULL_TREE' if something goes wrong, after issuing
6882 applicable error messages. */
6885 grokfndecl (tree ctype,
6889 tree orig_declarator,
6891 enum overload_flags flags,
6898 special_function_kind sfk,
6903 location_t location)
6906 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
6910 type = build_exception_variant (type, raises);
6912 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
6914 /* If we have an explicit location, use it, otherwise use whatever
6915 build_lang_decl used (probably input_location). */
6916 if (location != UNKNOWN_LOCATION)
6917 DECL_SOURCE_LOCATION (decl) = location;
6919 if (TREE_CODE (type) == METHOD_TYPE)
6922 parm = build_this_parm (type, quals);
6923 DECL_CHAIN (parm) = parms;
6926 DECL_ARGUMENTS (decl) = parms;
6927 for (t = parms; t; t = DECL_CHAIN (t))
6928 DECL_CONTEXT (t) = decl;
6929 /* Propagate volatile out from type to decl. */
6930 if (TYPE_VOLATILE (type))
6931 TREE_THIS_VOLATILE (decl) = 1;
6933 /* Setup decl according to sfk. */
6936 case sfk_constructor:
6937 case sfk_copy_constructor:
6938 case sfk_move_constructor:
6939 DECL_CONSTRUCTOR_P (decl) = 1;
6941 case sfk_destructor:
6942 DECL_DESTRUCTOR_P (decl) = 1;
6948 /* If pointers to member functions use the least significant bit to
6949 indicate whether a function is virtual, ensure a pointer
6950 to this function will have that bit clear. */
6951 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
6952 && TREE_CODE (type) == METHOD_TYPE
6953 && DECL_ALIGN (decl) < 2 * BITS_PER_UNIT)
6954 DECL_ALIGN (decl) = 2 * BITS_PER_UNIT;
6957 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
6961 ("defining explicit specialization %qD in friend declaration",
6965 tree fns = TREE_OPERAND (orig_declarator, 0);
6966 tree args = TREE_OPERAND (orig_declarator, 1);
6968 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
6970 /* Something like `template <class T> friend void f<T>()'. */
6971 error ("invalid use of template-id %qD in declaration "
6972 "of primary template",
6978 /* A friend declaration of the form friend void f<>(). Record
6979 the information in the TEMPLATE_ID_EXPR. */
6980 SET_DECL_IMPLICIT_INSTANTIATION (decl);
6982 if (TREE_CODE (fns) == COMPONENT_REF)
6984 /* Due to bison parser ickiness, we will have already looked
6985 up an operator_name or PFUNCNAME within the current class
6986 (see template_id in parse.y). If the current class contains
6987 such a name, we'll get a COMPONENT_REF here. Undo that. */
6989 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
6990 == current_class_type);
6991 fns = TREE_OPERAND (fns, 1);
6993 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
6994 || TREE_CODE (fns) == OVERLOAD);
6995 DECL_TEMPLATE_INFO (decl) = build_template_info (fns, args);
6997 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
6998 if (TREE_PURPOSE (t)
6999 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
7001 error ("default arguments are not allowed in declaration "
7002 "of friend template specialization %qD",
7009 error ("%<inline%> is not allowed in declaration of friend "
7010 "template specialization %qD",
7017 /* If this decl has namespace scope, set that up. */
7019 set_decl_namespace (decl, in_namespace, friendp);
7021 DECL_CONTEXT (decl) = FROB_CONTEXT (current_decl_namespace ());
7023 /* `main' and builtins have implicit 'C' linkage. */
7024 if ((MAIN_NAME_P (declarator)
7025 || (IDENTIFIER_LENGTH (declarator) > 10
7026 && IDENTIFIER_POINTER (declarator)[0] == '_'
7027 && IDENTIFIER_POINTER (declarator)[1] == '_'
7028 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
7029 && current_lang_name == lang_name_cplusplus
7030 && ctype == NULL_TREE
7031 && DECL_FILE_SCOPE_P (decl))
7032 SET_DECL_LANGUAGE (decl, lang_c);
7034 /* Should probably propagate const out from type to decl I bet (mrs). */
7037 DECL_STATIC_FUNCTION_P (decl) = 1;
7038 DECL_CONTEXT (decl) = ctype;
7043 DECL_CONTEXT (decl) = ctype;
7045 check_class_member_definition_namespace (decl);
7048 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7050 if (processing_template_decl)
7051 error ("cannot declare %<::main%> to be a template");
7053 error ("cannot declare %<::main%> to be inline");
7055 error ("cannot declare %<::main%> to be static");
7060 /* Members of anonymous types and local classes have no linkage; make
7061 them internal. If a typedef is made later, this will be changed. */
7062 if (ctype && (TYPE_ANONYMOUS_P (ctype)
7063 || decl_function_context (TYPE_MAIN_DECL (ctype))))
7066 if (publicp && cxx_dialect == cxx98)
7068 /* [basic.link]: A name with no linkage (notably, the name of a class
7069 or enumeration declared in a local scope) shall not be used to
7070 declare an entity with linkage.
7072 DR 757 relaxes this restriction for C++0x. */
7073 t = no_linkage_check (TREE_TYPE (decl),
7074 /*relaxed_p=*/false);
7077 if (TYPE_ANONYMOUS_P (t))
7079 if (DECL_EXTERN_C_P (decl))
7080 /* Allow this; it's pretty common in C. */;
7083 permerror (input_location, "anonymous type with no linkage "
7084 "used to declare function %q#D with linkage",
7086 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7087 permerror (input_location, "%q+#D does not refer to the unqualified "
7088 "type, so it is not used for linkage",
7093 permerror (input_location, "type %qT with no linkage used to "
7094 "declare function %q#D with linkage", t, decl);
7098 TREE_PUBLIC (decl) = publicp;
7101 DECL_INTERFACE_KNOWN (decl) = 1;
7102 DECL_NOT_REALLY_EXTERN (decl) = 1;
7105 /* If the declaration was declared inline, mark it as such. */
7107 DECL_DECLARED_INLINE_P (decl) = 1;
7109 DECL_DECLARED_CONSTEXPR_P (decl) = true;
7111 DECL_EXTERNAL (decl) = 1;
7112 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
7115 ? G_("static member function %qD cannot have cv-qualifier")
7116 : G_("non-member function %qD cannot have cv-qualifier"),
7118 quals = TYPE_UNQUALIFIED;
7121 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
7122 && !grok_op_properties (decl, /*complain=*/true))
7126 /* Make the init_value nonzero so pushdecl knows this is not
7127 tentative. error_mark_node is replaced later with the BLOCK. */
7128 DECL_INITIAL (decl) = error_mark_node;
7130 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
7131 TREE_NOTHROW (decl) = 1;
7133 /* Caller will do the rest of this. */
7137 if (ctype != NULL_TREE)
7138 grokclassfn (ctype, decl, flags);
7140 decl = check_explicit_specialization (orig_declarator, decl,
7143 4 * (friendp != 0));
7144 if (decl == error_mark_node)
7149 cplus_decl_attributes (&decl, *attrlist, 0);
7150 *attrlist = NULL_TREE;
7153 /* Check main's type after attributes have been applied. */
7154 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7156 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
7159 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
7161 error ("%<::main%> must return %<int%>");
7162 newtype = build_function_type (integer_type_node, oldtypeargs);
7163 TREE_TYPE (decl) = newtype;
7166 check_main_parameter_types (decl);
7169 if (ctype != NULL_TREE
7170 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
7173 tree old_decl = check_classfn (ctype, decl,
7174 (processing_template_decl
7175 > template_class_depth (ctype))
7176 ? current_template_parms
7179 if (old_decl == error_mark_node)
7187 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
7188 /* Because grokfndecl is always supposed to return a
7189 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
7190 here. We depend on our callers to figure out that its
7191 really a template that's being returned. */
7192 old_decl = DECL_TEMPLATE_RESULT (old_decl);
7194 if (DECL_STATIC_FUNCTION_P (old_decl)
7195 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
7196 /* Remove the `this' parm added by grokclassfn.
7197 XXX Isn't this done in start_function, too? */
7198 revert_static_member_fn (decl);
7199 if (DECL_ARTIFICIAL (old_decl))
7201 error ("definition of implicitly-declared %qD", old_decl);
7205 /* Since we've smashed OLD_DECL to its
7206 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
7207 if (TREE_CODE (decl) == TEMPLATE_DECL)
7208 decl = DECL_TEMPLATE_RESULT (decl);
7210 /* Attempt to merge the declarations. This can fail, in
7211 the case of some invalid specialization declarations. */
7212 pushed_scope = push_scope (ctype);
7213 ok = duplicate_decls (decl, old_decl, friendp);
7215 pop_scope (pushed_scope);
7218 error ("no %q#D member function declared in class %qT",
7226 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
7229 if (ctype == NULL_TREE || check)
7233 DECL_VIRTUAL_P (decl) = 1;
7238 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
7239 the linkage that DECL will receive in the object file. */
7242 set_linkage_for_static_data_member (tree decl)
7244 /* A static data member always has static storage duration and
7245 external linkage. Note that static data members are forbidden in
7246 local classes -- the only situation in which a class has
7247 non-external linkage. */
7248 TREE_PUBLIC (decl) = 1;
7249 TREE_STATIC (decl) = 1;
7250 /* For non-template classes, static data members are always put
7251 out in exactly those files where they are defined, just as
7252 with ordinary namespace-scope variables. */
7253 if (!processing_template_decl)
7254 DECL_INTERFACE_KNOWN (decl) = 1;
7257 /* Create a VAR_DECL named NAME with the indicated TYPE.
7259 If SCOPE is non-NULL, it is the class type or namespace containing
7260 the variable. If SCOPE is NULL, the variable should is created in
7261 the innermost enclosings scope. */
7264 grokvardecl (tree type,
7266 const cp_decl_specifier_seq *declspecs,
7272 tree explicit_scope;
7274 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
7276 /* Compute the scope in which to place the variable, but remember
7277 whether or not that scope was explicitly specified by the user. */
7278 explicit_scope = scope;
7281 /* An explicit "extern" specifier indicates a namespace-scope
7283 if (declspecs->storage_class == sc_extern)
7284 scope = current_decl_namespace ();
7285 else if (!at_function_scope_p ())
7286 scope = current_scope ();
7290 && (/* If the variable is a namespace-scope variable declared in a
7291 template, we need DECL_LANG_SPECIFIC. */
7292 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
7293 /* Similarly for namespace-scope variables with language linkage
7295 || (TREE_CODE (scope) == NAMESPACE_DECL
7296 && current_lang_name != lang_name_cplusplus)
7297 /* Similarly for static data members. */
7299 decl = build_lang_decl (VAR_DECL, name, type);
7301 decl = build_decl (input_location, VAR_DECL, name, type);
7303 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
7304 set_decl_namespace (decl, explicit_scope, 0);
7306 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
7308 if (declspecs->storage_class == sc_extern)
7310 DECL_THIS_EXTERN (decl) = 1;
7311 DECL_EXTERNAL (decl) = !initialized;
7314 if (DECL_CLASS_SCOPE_P (decl))
7316 set_linkage_for_static_data_member (decl);
7317 /* This function is only called with out-of-class definitions. */
7318 DECL_EXTERNAL (decl) = 0;
7319 check_class_member_definition_namespace (decl);
7321 /* At top level, either `static' or no s.c. makes a definition
7322 (perhaps tentative), and absence of `static' makes it public. */
7323 else if (toplevel_bindings_p ())
7325 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
7326 && (DECL_THIS_EXTERN (decl) || ! constp));
7327 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
7329 /* Not at top level, only `static' makes a static definition. */
7332 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
7333 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
7336 if (declspecs->specs[(int)ds_thread])
7337 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
7339 /* If the type of the decl has no linkage, make sure that we'll
7340 notice that in mark_used. */
7341 if (cxx_dialect > cxx98
7342 && decl_linkage (decl) != lk_none
7343 && DECL_LANG_SPECIFIC (decl) == NULL
7344 && !DECL_EXTERN_C_P (decl)
7345 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
7346 retrofit_lang_decl (decl);
7348 if (TREE_PUBLIC (decl))
7350 /* [basic.link]: A name with no linkage (notably, the name of a class
7351 or enumeration declared in a local scope) shall not be used to
7352 declare an entity with linkage.
7354 DR 757 relaxes this restriction for C++0x. */
7355 tree t = (cxx_dialect > cxx98 ? NULL_TREE
7356 : no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false));
7359 if (TYPE_ANONYMOUS_P (t))
7361 if (DECL_EXTERN_C_P (decl))
7362 /* Allow this; it's pretty common in C. */
7366 /* DRs 132, 319 and 389 seem to indicate types with
7367 no linkage can only be used to declare extern "C"
7368 entities. Since it's not always an error in the
7369 ISO C++ 90 Standard, we only issue a warning. */
7370 warning (0, "anonymous type with no linkage used to declare "
7371 "variable %q#D with linkage", decl);
7372 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7373 warning (0, "%q+#D does not refer to the unqualified "
7374 "type, so it is not used for linkage",
7379 warning (0, "type %qT with no linkage used to declare variable "
7380 "%q#D with linkage", t, decl);
7384 DECL_INTERFACE_KNOWN (decl) = 1;
7389 /* Create and return a canonical pointer to member function type, for
7390 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
7393 build_ptrmemfunc_type (tree type)
7397 tree unqualified_variant = NULL_TREE;
7399 if (type == error_mark_node)
7402 /* If a canonical type already exists for this type, use it. We use
7403 this method instead of type_hash_canon, because it only does a
7404 simple equality check on the list of field members. */
7406 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
7409 /* Make sure that we always have the unqualified pointer-to-member
7411 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7413 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
7415 t = make_class_type (RECORD_TYPE);
7416 xref_basetypes (t, NULL_TREE);
7418 /* Let the front end know this is a pointer to member function... */
7419 TYPE_PTRMEMFUNC_FLAG (t) = 1;
7420 /* ... and not really a class type. */
7421 SET_CLASS_TYPE_P (t, 0);
7423 field = build_decl (input_location, FIELD_DECL, pfn_identifier, type);
7426 field = build_decl (input_location, FIELD_DECL, delta_identifier,
7428 DECL_CHAIN (field) = fields;
7431 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
7433 /* Zap out the name so that the back end will give us the debugging
7434 information for this anonymous RECORD_TYPE. */
7435 TYPE_NAME (t) = NULL_TREE;
7437 /* If this is not the unqualified form of this pointer-to-member
7438 type, set the TYPE_MAIN_VARIANT for this type to be the
7439 unqualified type. Since they are actually RECORD_TYPEs that are
7440 not variants of each other, we must do this manually.
7441 As we just built a new type there is no need to do yet another copy. */
7442 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7444 int type_quals = cp_type_quals (type);
7445 TYPE_READONLY (t) = (type_quals & TYPE_QUAL_CONST) != 0;
7446 TYPE_VOLATILE (t) = (type_quals & TYPE_QUAL_VOLATILE) != 0;
7447 TYPE_RESTRICT (t) = (type_quals & TYPE_QUAL_RESTRICT) != 0;
7448 TYPE_MAIN_VARIANT (t) = unqualified_variant;
7449 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
7450 TYPE_NEXT_VARIANT (unqualified_variant) = t;
7451 TREE_TYPE (TYPE_BINFO (t)) = t;
7454 /* Cache this pointer-to-member type so that we can find it again
7456 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
7458 if (TYPE_STRUCTURAL_EQUALITY_P (type))
7459 SET_TYPE_STRUCTURAL_EQUALITY (t);
7460 else if (TYPE_CANONICAL (type) != type)
7461 TYPE_CANONICAL (t) = build_ptrmemfunc_type (TYPE_CANONICAL (type));
7466 /* Create and return a pointer to data member type. */
7469 build_ptrmem_type (tree class_type, tree member_type)
7471 if (TREE_CODE (member_type) == METHOD_TYPE)
7473 cp_cv_quals quals = type_memfn_quals (member_type);
7474 member_type = build_memfn_type (member_type, class_type, quals);
7475 return build_ptrmemfunc_type (build_pointer_type (member_type));
7479 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
7480 return build_offset_type (class_type, member_type);
7484 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
7485 Check to see that the definition is valid. Issue appropriate error
7486 messages. Return 1 if the definition is particularly bad, or 0
7490 check_static_variable_definition (tree decl, tree type)
7492 /* If DECL is declared constexpr, we'll do the appropriate checks
7493 in check_initializer. */
7494 if (DECL_P (decl) && DECL_DECLARED_CONSTEXPR_P (decl))
7496 else if (cxx_dialect >= cxx0x && !INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7498 if (literal_type_p (type))
7499 error ("%<constexpr%> needed for in-class initialization of static "
7500 "data member %q#D of non-integral type", decl);
7502 error ("in-class initialization of static data member %q#D of "
7503 "non-literal type", decl);
7507 /* Motion 10 at San Diego: If a static const integral data member is
7508 initialized with an integral constant expression, the initializer
7509 may appear either in the declaration (within the class), or in
7510 the definition, but not both. If it appears in the class, the
7511 member is a member constant. The file-scope definition is always
7513 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
7515 error ("invalid in-class initialization of static data member "
7516 "of non-integral type %qT",
7520 else if (!CP_TYPE_CONST_P (type))
7521 error ("ISO C++ forbids in-class initialization of non-const "
7522 "static member %qD",
7524 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7525 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids initialization of member constant "
7526 "%qD of non-integral type %qT", decl, type);
7531 /* Given the SIZE (i.e., number of elements) in an array, compute an
7532 appropriate index type for the array. If non-NULL, NAME is the
7533 name of the thing being declared. */
7536 compute_array_index_type (tree name, tree size, tsubst_flags_t complain)
7541 tree abi_1_itype = NULL_TREE;
7543 if (error_operand_p (size))
7544 return error_mark_node;
7546 type = TREE_TYPE (size);
7547 /* type_dependent_expression_p? */
7548 if (!dependent_type_p (type))
7550 mark_rvalue_use (size);
7552 if (cxx_dialect < cxx0x && TREE_CODE (size) == NOP_EXPR
7553 && TREE_SIDE_EFFECTS (size))
7554 /* In C++98, we mark a non-constant array bound with a magic
7555 NOP_EXPR with TREE_SIDE_EFFECTS; don't fold in that case. */;
7558 size = fold_non_dependent_expr (size);
7560 if (CLASS_TYPE_P (type)
7561 && CLASSTYPE_LITERAL_P (type))
7563 size = build_expr_type_conversion (WANT_INT, size, true);
7564 if (size == error_mark_node)
7565 return error_mark_node;
7566 type = TREE_TYPE (size);
7567 /* We didn't support this case in GCC 3.2, so don't bother
7568 trying to model it now in ABI v1. */
7569 abi_1_itype = error_mark_node;
7572 size = maybe_constant_value (size);
7573 if (!TREE_CONSTANT (size))
7577 if (error_operand_p (size))
7578 return error_mark_node;
7580 /* The array bound must be an integer type. */
7581 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
7583 if (!(complain & tf_error))
7584 return error_mark_node;
7586 error ("size of array %qD has non-integral type %qT", name, type);
7588 error ("size of array has non-integral type %qT", type);
7589 size = integer_one_node;
7590 type = TREE_TYPE (size);
7594 /* A type is dependent if it is...an array type constructed from any
7595 dependent type or whose size is specified by a constant expression
7596 that is value-dependent. */
7597 /* We can only call value_dependent_expression_p on integral constant
7598 expressions; treat non-constant expressions as dependent, too. */
7599 if (processing_template_decl
7600 && (dependent_type_p (type)
7601 || !TREE_CONSTANT (size) || value_dependent_expression_p (size)))
7603 /* We cannot do any checking for a SIZE that isn't known to be
7604 constant. Just build the index type and mark that it requires
7605 structural equality checks. */
7606 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7607 size, integer_one_node));
7608 TYPE_DEPENDENT_P (itype) = 1;
7609 TYPE_DEPENDENT_P_VALID (itype) = 1;
7610 SET_TYPE_STRUCTURAL_EQUALITY (itype);
7614 if (!abi_version_at_least (2) && processing_template_decl
7615 && abi_1_itype == NULL_TREE)
7616 /* For abi-1, we handled all instances in templates the same way,
7617 even when they were non-dependent. This affects the manglings
7618 produced. So, we do the normal checking for non-dependent
7619 sizes, but at the end we'll return the same type that abi-1
7620 would have, but with TYPE_CANONICAL set to the "right"
7621 value that the current ABI would provide. */
7622 abi_1_itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7623 osize, integer_one_node));
7625 /* Normally, the array-bound will be a constant. */
7626 if (TREE_CODE (size) == INTEGER_CST)
7628 /* Check to see if the array bound overflowed. Make that an
7629 error, no matter how generous we're being. */
7630 constant_expression_error (size);
7632 /* An array must have a positive number of elements. */
7633 if (INT_CST_LT (size, integer_zero_node))
7635 if (!(complain & tf_error))
7636 return error_mark_node;
7638 error ("size of array %qD is negative", name);
7640 error ("size of array is negative");
7641 size = integer_one_node;
7643 /* As an extension we allow zero-sized arrays. */
7644 else if (integer_zerop (size))
7646 if (!(complain & tf_error))
7647 /* We must fail if performing argument deduction (as
7648 indicated by the state of complain), so that
7649 another substitution can be found. */
7650 return error_mark_node;
7651 else if (in_system_header)
7652 /* Allow them in system headers because glibc uses them. */;
7654 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array %qD", name);
7656 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array");
7659 else if (TREE_CONSTANT (size)
7660 /* We don't allow VLAs at non-function scopes, or during
7661 tentative template substitution. */
7662 || !at_function_scope_p () || !(complain & tf_error))
7664 if (!(complain & tf_error))
7665 return error_mark_node;
7666 /* `(int) &fn' is not a valid array bound. */
7668 error ("size of array %qD is not an integral constant-expression",
7671 error ("size of array is not an integral constant-expression");
7672 size = integer_one_node;
7674 else if (pedantic && warn_vla != 0)
7677 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array %qD", name);
7679 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array");
7681 else if (warn_vla > 0)
7685 "variable length array %qD is used", name);
7688 "variable length array is used");
7691 if (processing_template_decl && !TREE_CONSTANT (size))
7692 /* A variable sized array. */
7693 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
7696 HOST_WIDE_INT saved_processing_template_decl;
7698 /* Compute the index of the largest element in the array. It is
7699 one less than the number of elements in the array. We save
7700 and restore PROCESSING_TEMPLATE_DECL so that computations in
7701 cp_build_binary_op will be appropriately folded. */
7702 saved_processing_template_decl = processing_template_decl;
7703 processing_template_decl = 0;
7704 itype = cp_build_binary_op (input_location,
7706 cp_convert (ssizetype, size),
7707 cp_convert (ssizetype, integer_one_node),
7708 tf_warning_or_error);
7709 itype = fold (itype);
7710 processing_template_decl = saved_processing_template_decl;
7712 if (!TREE_CONSTANT (itype))
7714 /* A variable sized array. */
7715 if (TREE_SIDE_EFFECTS (itype))
7716 /* Use get_temp_regvar rather than variable_size here so that
7717 people walking expressions that use a variable of this type
7718 don't walk into this expression. */
7719 itype = get_temp_regvar (TREE_TYPE (itype), itype);
7721 itype = variable_size (itype);
7723 /* Make sure that there was no overflow when creating to a signed
7724 index type. (For example, on a 32-bit machine, an array with
7725 size 2^32 - 1 is too big.) */
7726 else if (TREE_CODE (itype) == INTEGER_CST
7727 && TREE_OVERFLOW (itype))
7729 if (!(complain & tf_error))
7730 return error_mark_node;
7731 error ("overflow in array dimension");
7732 TREE_OVERFLOW (itype) = 0;
7736 /* Create and return the appropriate index type. */
7737 if (abi_1_itype && abi_1_itype != error_mark_node)
7739 tree t = build_index_type (itype);
7740 TYPE_CANONICAL (abi_1_itype) = TYPE_CANONICAL (t);
7741 itype = abi_1_itype;
7744 itype = build_index_type (itype);
7746 /* If the index type were dependent, we would have returned early, so
7747 remember that it isn't. */
7748 TYPE_DEPENDENT_P (itype) = 0;
7749 TYPE_DEPENDENT_P_VALID (itype) = 1;
7753 /* Returns the scope (if any) in which the entity declared by
7754 DECLARATOR will be located. If the entity was declared with an
7755 unqualified name, NULL_TREE is returned. */
7758 get_scope_of_declarator (const cp_declarator *declarator)
7760 while (declarator && declarator->kind != cdk_id)
7761 declarator = declarator->declarator;
7763 /* If the declarator-id is a SCOPE_REF, the scope in which the
7764 declaration occurs is the first operand. */
7766 && declarator->u.id.qualifying_scope)
7767 return declarator->u.id.qualifying_scope;
7769 /* Otherwise, the declarator is not a qualified name; the entity will
7770 be declared in the current scope. */
7774 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
7775 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
7779 create_array_type_for_decl (tree name, tree type, tree size)
7781 tree itype = NULL_TREE;
7783 /* If things have already gone awry, bail now. */
7784 if (type == error_mark_node || size == error_mark_node)
7785 return error_mark_node;
7787 /* If there are some types which cannot be array elements,
7788 issue an error-message and return. */
7789 switch (TREE_CODE (type))
7793 error ("declaration of %qD as array of void", name);
7795 error ("creating array of void");
7796 return error_mark_node;
7800 error ("declaration of %qD as array of functions", name);
7802 error ("creating array of functions");
7803 return error_mark_node;
7805 case REFERENCE_TYPE:
7807 error ("declaration of %qD as array of references", name);
7809 error ("creating array of references");
7810 return error_mark_node;
7814 error ("declaration of %qD as array of function members", name);
7816 error ("creating array of function members");
7817 return error_mark_node;
7825 The constant expressions that specify the bounds of the arrays
7826 can be omitted only for the first member of the sequence. */
7827 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
7830 error ("declaration of %qD as multidimensional array must "
7831 "have bounds for all dimensions except the first",
7834 error ("multidimensional array must have bounds for all "
7835 "dimensions except the first");
7837 return error_mark_node;
7840 /* Figure out the index type for the array. */
7842 itype = compute_array_index_type (name, size, tf_warning_or_error);
7845 T is called the array element type; this type shall not be [...] an
7846 abstract class type. */
7847 abstract_virtuals_error (name, type);
7849 return build_cplus_array_type (type, itype);
7852 /* Check that it's OK to declare a function with the indicated TYPE.
7853 SFK indicates the kind of special function (if any) that this
7854 function is. OPTYPE is the type given in a conversion operator
7855 declaration, or the class type for a constructor/destructor.
7856 Returns the actual return type of the function; that
7857 may be different than TYPE if an error occurs, or for certain
7858 special functions. */
7861 check_special_function_return_type (special_function_kind sfk,
7867 case sfk_constructor:
7869 error ("return type specification for constructor invalid");
7871 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7872 type = build_pointer_type (optype);
7874 type = void_type_node;
7877 case sfk_destructor:
7879 error ("return type specification for destructor invalid");
7880 /* We can't use the proper return type here because we run into
7881 problems with ambiguous bases and covariant returns.
7882 Java classes are left unchanged because (void *) isn't a valid
7883 Java type, and we don't want to change the Java ABI. */
7884 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7885 type = build_pointer_type (void_type_node);
7887 type = void_type_node;
7890 case sfk_conversion:
7892 error ("return type specified for %<operator %T%>", optype);
7903 /* A variable or data member (whose unqualified name is IDENTIFIER)
7904 has been declared with the indicated TYPE. If the TYPE is not
7905 acceptable, issue an error message and return a type to use for
7906 error-recovery purposes. */
7909 check_var_type (tree identifier, tree type)
7911 if (VOID_TYPE_P (type))
7914 error ("unnamed variable or field declared void");
7915 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
7917 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
7918 error ("variable or field %qE declared void", identifier);
7921 error ("variable or field declared void");
7922 type = error_mark_node;
7928 /* Given declspecs and a declarator (abstract or otherwise), determine
7929 the name and type of the object declared and construct a DECL node
7932 DECLSPECS points to the representation of declaration-specifier
7933 sequence that precedes declarator.
7935 DECL_CONTEXT says which syntactic context this declaration is in:
7936 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
7937 FUNCDEF for a function definition. Like NORMAL but a few different
7938 error messages in each case. Return value may be zero meaning
7939 this definition is too screwy to try to parse.
7940 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
7941 handle member functions (which have FIELD context).
7942 Return value may be zero meaning this definition is too screwy to
7944 PARM for a parameter declaration (either within a function prototype
7945 or before a function body). Make a PARM_DECL, or return void_type_node.
7946 TPARM for a template parameter declaration.
7947 CATCHPARM for a parameter declaration before a catch clause.
7948 TYPENAME if for a typename (in a cast or sizeof).
7949 Don't make a DECL node; just return the ..._TYPE node.
7950 FIELD for a struct or union field; make a FIELD_DECL.
7951 BITFIELD for a field with specified width.
7953 INITIALIZED is as for start_decl.
7955 ATTRLIST is a pointer to the list of attributes, which may be NULL
7956 if there are none; *ATTRLIST may be modified if attributes from inside
7957 the declarator should be applied to the declaration.
7959 When this function is called, scoping variables (such as
7960 CURRENT_CLASS_TYPE) should reflect the scope in which the
7961 declaration occurs, not the scope in which the new declaration will
7962 be placed. For example, on:
7966 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
7969 Returns a DECL (if a declarator is present), a TYPE (if there is no
7970 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
7974 grokdeclarator (const cp_declarator *declarator,
7975 const cp_decl_specifier_seq *declspecs,
7976 enum decl_context decl_context,
7980 tree type = NULL_TREE;
7982 int explicit_int128 = 0;
7983 int virtualp, explicitp, friendp, inlinep, staticp;
7984 int explicit_int = 0;
7985 int explicit_char = 0;
7986 int defaulted_int = 0;
7987 tree dependent_name = NULL_TREE;
7989 tree typedef_decl = NULL_TREE;
7990 const char *name = NULL;
7991 tree typedef_type = NULL_TREE;
7992 /* True if this declarator is a function definition. */
7993 bool funcdef_flag = false;
7994 cp_declarator_kind innermost_code = cdk_error;
7997 /* See the code below that used this. */
7998 tree decl_attr = NULL_TREE;
8001 /* Keep track of what sort of function is being processed
8002 so that we can warn about default return values, or explicit
8003 return values which do not match prescribed defaults. */
8004 special_function_kind sfk = sfk_none;
8006 tree dname = NULL_TREE;
8007 tree ctor_return_type = NULL_TREE;
8008 enum overload_flags flags = NO_SPECIAL;
8009 /* cv-qualifiers that apply to the declarator, for a declaration of
8010 a member function. */
8011 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
8012 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
8014 tree raises = NULL_TREE;
8015 int template_count = 0;
8016 tree returned_attrs = NULL_TREE;
8017 tree parms = NULL_TREE;
8018 const cp_declarator *id_declarator;
8019 /* The unqualified name of the declarator; either an
8020 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
8021 tree unqualified_id;
8022 /* The class type, if any, in which this entity is located,
8023 or NULL_TREE if none. Note that this value may be different from
8024 the current class type; for example if an attempt is made to declare
8025 "A::f" inside "B", this value will be "A". */
8026 tree ctype = current_class_type;
8027 /* The NAMESPACE_DECL for the namespace in which this entity is
8028 located. If an unqualified name is used to declare the entity,
8029 this value will be NULL_TREE, even if the entity is located at
8031 tree in_namespace = NULL_TREE;
8032 cp_storage_class storage_class;
8033 bool unsigned_p, signed_p, short_p, long_p, thread_p;
8034 bool type_was_error_mark_node = false;
8035 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
8036 bool template_type_arg = false;
8037 bool template_parm_flag = false;
8038 bool constexpr_p = declspecs->specs[(int) ds_constexpr];
8041 signed_p = declspecs->specs[(int)ds_signed];
8042 unsigned_p = declspecs->specs[(int)ds_unsigned];
8043 short_p = declspecs->specs[(int)ds_short];
8044 long_p = declspecs->specs[(int)ds_long];
8045 longlong = declspecs->specs[(int)ds_long] >= 2;
8046 explicit_int128 = declspecs->explicit_int128_p;
8047 thread_p = declspecs->specs[(int)ds_thread];
8049 if (decl_context == FUNCDEF)
8050 funcdef_flag = true, decl_context = NORMAL;
8051 else if (decl_context == MEMFUNCDEF)
8052 funcdef_flag = true, decl_context = FIELD;
8053 else if (decl_context == BITFIELD)
8054 bitfield = 1, decl_context = FIELD;
8055 else if (decl_context == TEMPLATE_TYPE_ARG)
8056 template_type_arg = true, decl_context = TYPENAME;
8057 else if (decl_context == TPARM)
8058 template_parm_flag = true, decl_context = PARM;
8060 if (initialized > 1)
8061 funcdef_flag = true;
8063 /* Look inside a declarator for the name being declared
8064 and get it as a string, for an error message. */
8065 for (id_declarator = declarator;
8067 id_declarator = id_declarator->declarator)
8069 if (id_declarator->kind != cdk_id)
8070 innermost_code = id_declarator->kind;
8072 switch (id_declarator->kind)
8075 if (id_declarator->declarator
8076 && id_declarator->declarator->kind == cdk_id)
8078 sfk = id_declarator->declarator->u.id.sfk;
8079 if (sfk == sfk_destructor)
8086 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
8087 tree decl = id_declarator->u.id.unqualified_name;
8090 if (qualifying_scope)
8092 if (at_function_scope_p ())
8096 A declarator-id shall not be qualified except
8099 None of the cases are permitted in block
8101 if (qualifying_scope == global_namespace)
8102 error ("invalid use of qualified-name %<::%D%>",
8104 else if (TYPE_P (qualifying_scope))
8105 error ("invalid use of qualified-name %<%T::%D%>",
8106 qualifying_scope, decl);
8108 error ("invalid use of qualified-name %<%D::%D%>",
8109 qualifying_scope, decl);
8110 return error_mark_node;
8112 else if (TYPE_P (qualifying_scope))
8114 ctype = qualifying_scope;
8115 if (innermost_code != cdk_function
8116 && current_class_type
8117 && !UNIQUELY_DERIVED_FROM_P (ctype,
8118 current_class_type))
8120 error ("type %qT is not derived from type %qT",
8121 ctype, current_class_type);
8122 return error_mark_node;
8125 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
8126 in_namespace = qualifying_scope;
8128 switch (TREE_CODE (decl))
8134 if (innermost_code != cdk_function)
8136 error ("declaration of %qD as non-function", decl);
8137 return error_mark_node;
8139 else if (!qualifying_scope
8140 && !(current_class_type && at_class_scope_p ()))
8142 error ("declaration of %qD as non-member", decl);
8143 return error_mark_node;
8146 type = TREE_OPERAND (decl, 0);
8148 type = constructor_name (type);
8149 name = identifier_to_locale (IDENTIFIER_POINTER (type));
8154 case TEMPLATE_ID_EXPR:
8156 tree fns = TREE_OPERAND (decl, 0);
8159 if (TREE_CODE (dname) != IDENTIFIER_NODE)
8161 gcc_assert (is_overloaded_fn (dname));
8162 dname = DECL_NAME (get_first_fn (dname));
8167 case IDENTIFIER_NODE:
8168 if (TREE_CODE (decl) == IDENTIFIER_NODE)
8171 if (C_IS_RESERVED_WORD (dname))
8173 error ("declarator-id missing; using reserved word %qD",
8175 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8177 else if (!IDENTIFIER_TYPENAME_P (dname))
8178 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8181 gcc_assert (flags == NO_SPECIAL);
8182 flags = TYPENAME_FLAG;
8183 ctor_return_type = TREE_TYPE (dname);
8184 sfk = sfk_conversion;
8185 if (is_typename_at_global_scope (dname))
8186 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8188 name = "<invalid operator>";
8205 return error_mark_node;
8210 if (id_declarator->kind == cdk_id)
8216 The declarator in a function-definition shall have the form
8217 D1 ( parameter-declaration-clause) ... */
8218 if (funcdef_flag && innermost_code != cdk_function)
8220 error ("function definition does not declare parameters");
8221 return error_mark_node;
8224 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
8225 && innermost_code != cdk_function
8226 && ! (ctype && !declspecs->any_specifiers_p))
8228 error ("declaration of %qD as non-function", dname);
8229 return error_mark_node;
8232 /* Anything declared one level down from the top level
8233 must be one of the parameters of a function
8234 (because the body is at least two levels down). */
8236 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
8237 by not allowing C++ class definitions to specify their parameters
8238 with xdecls (must be spec.d in the parmlist).
8240 Since we now wait to push a class scope until we are sure that
8241 we are in a legitimate method context, we must set oldcname
8242 explicitly (since current_class_name is not yet alive).
8244 We also want to avoid calling this a PARM if it is in a namespace. */
8246 if (decl_context == NORMAL && !toplevel_bindings_p ())
8248 struct cp_binding_level *b = current_binding_level;
8249 current_binding_level = b->level_chain;
8250 if (current_binding_level != 0 && toplevel_bindings_p ())
8251 decl_context = PARM;
8252 current_binding_level = b;
8256 name = decl_context == PARM ? "parameter" : "type name";
8258 if (constexpr_p && declspecs->specs[(int)ds_typedef])
8260 error ("%<constexpr%> cannot appear in a typedef declaration");
8261 return error_mark_node;
8264 /* If there were multiple types specified in the decl-specifier-seq,
8265 issue an error message. */
8266 if (declspecs->multiple_types_p)
8268 error ("two or more data types in declaration of %qs", name);
8269 return error_mark_node;
8272 if (declspecs->conflicting_specifiers_p)
8274 error ("conflicting specifiers in declaration of %qs", name);
8275 return error_mark_node;
8278 /* Extract the basic type from the decl-specifier-seq. */
8279 type = declspecs->type;
8280 if (type == error_mark_node)
8283 type_was_error_mark_node = true;
8285 /* If the entire declaration is itself tagged as deprecated then
8286 suppress reports of deprecated items. */
8287 if (type && TREE_DEPRECATED (type)
8288 && deprecated_state != DEPRECATED_SUPPRESS)
8289 warn_deprecated_use (type, NULL_TREE);
8290 if (type && TREE_CODE (type) == TYPE_DECL)
8292 typedef_decl = type;
8293 type = TREE_TYPE (typedef_decl);
8294 if (TREE_DEPRECATED (type)
8295 && DECL_ARTIFICIAL (typedef_decl)
8296 && deprecated_state != DEPRECATED_SUPPRESS)
8297 warn_deprecated_use (type, NULL_TREE);
8299 /* No type at all: default to `int', and set DEFAULTED_INT
8300 because it was not a user-defined typedef. */
8301 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
8303 /* These imply 'int'. */
8304 type = integer_type_node;
8308 explicit_int = declspecs->explicit_int_p;
8309 explicit_char = declspecs->explicit_char_p;
8312 /* See the code below that used this. */
8314 decl_attr = DECL_ATTRIBUTES (typedef_decl);
8316 typedef_type = type;
8319 if (sfk != sfk_conversion)
8320 ctor_return_type = ctype;
8322 if (sfk != sfk_none)
8323 type = check_special_function_return_type (sfk, type,
8325 else if (type == NULL_TREE)
8331 /* We handle `main' specially here, because 'main () { }' is so
8332 common. With no options, it is allowed. With -Wreturn-type,
8333 it is a warning. It is only an error with -pedantic-errors. */
8334 is_main = (funcdef_flag
8335 && dname && TREE_CODE (dname) == IDENTIFIER_NODE
8336 && MAIN_NAME_P (dname)
8337 && ctype == NULL_TREE
8338 && in_namespace == NULL_TREE
8339 && current_namespace == global_namespace);
8341 if (type_was_error_mark_node)
8342 /* We've already issued an error, don't complain more. */;
8343 else if (in_system_header || flag_ms_extensions)
8344 /* Allow it, sigh. */;
8346 permerror (input_location, "ISO C++ forbids declaration of %qs with no type", name);
8348 pedwarn (input_location, OPT_pedantic,
8349 "ISO C++ forbids declaration of %qs with no type", name);
8351 warning (OPT_Wreturn_type,
8352 "ISO C++ forbids declaration of %qs with no type", name);
8354 type = integer_type_node;
8359 /* Now process the modifiers that were specified
8360 and check for invalid combinations. */
8362 /* Long double is a special combination. */
8363 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
8366 type = cp_build_qualified_type (long_double_type_node,
8367 cp_type_quals (type));
8370 /* Check all other uses of type modifiers. */
8372 if (unsigned_p || signed_p || long_p || short_p)
8376 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
8377 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8378 else if (signed_p && unsigned_p)
8379 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
8380 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
8381 error ("%<long long%> invalid for %qs", name);
8382 else if (explicit_int128 && TREE_CODE (type) != INTEGER_TYPE)
8383 error ("%<__int128%> invalid for %qs", name);
8384 else if (long_p && TREE_CODE (type) == REAL_TYPE)
8385 error ("%<long%> invalid for %qs", name);
8386 else if (short_p && TREE_CODE (type) == REAL_TYPE)
8387 error ("%<short%> invalid for %qs", name);
8388 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
8389 error ("%<long%> or %<short%> invalid for %qs", name);
8390 else if ((long_p || short_p || explicit_char || explicit_int) && explicit_int128)
8391 error ("%<long%>, %<int%>, %<short%>, or %<char%> invalid for %qs", name);
8392 else if ((long_p || short_p) && explicit_char)
8393 error ("%<long%> or %<short%> specified with char for %qs", name);
8394 else if (long_p && short_p)
8395 error ("%<long%> and %<short%> specified together for %qs", name);
8396 else if (type == char16_type_node || type == char32_type_node)
8398 if (signed_p || unsigned_p)
8399 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8400 else if (short_p || long_p)
8401 error ("%<short%> or %<long%> invalid for %qs", name);
8406 if (!explicit_int && !defaulted_int && !explicit_char && !explicit_int128 && pedantic)
8408 pedwarn (input_location, OPT_pedantic,
8409 "long, short, signed or unsigned used invalidly for %qs",
8411 if (flag_pedantic_errors)
8414 if (explicit_int128)
8416 if (int128_integer_type_node == NULL_TREE)
8418 error ("%<__int128%> is not supported by this target");
8423 pedwarn (input_location, OPT_pedantic,
8424 "ISO C++ does not support %<__int128%> for %qs",
8426 if (flag_pedantic_errors)
8432 /* Discard the type modifiers if they are invalid. */
8440 explicit_int128 = false;
8444 /* Decide whether an integer type is signed or not.
8445 Optionally treat bitfields as signed by default. */
8449 It is implementation-defined whether a plain (neither
8450 explicitly signed or unsigned) char, short, int, or long
8451 bit-field is signed or unsigned.
8453 Naturally, we extend this to long long as well. Note that
8454 this does not include wchar_t. */
8455 || (bitfield && !flag_signed_bitfields
8457 /* A typedef for plain `int' without `signed' can be
8458 controlled just like plain `int', but a typedef for
8459 `signed int' cannot be so controlled. */
8461 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
8462 && TREE_CODE (type) == INTEGER_TYPE
8463 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
8465 if (explicit_int128)
8466 type = int128_unsigned_type_node;
8468 type = long_long_unsigned_type_node;
8470 type = long_unsigned_type_node;
8472 type = short_unsigned_type_node;
8473 else if (type == char_type_node)
8474 type = unsigned_char_type_node;
8475 else if (typedef_decl)
8476 type = unsigned_type_for (type);
8478 type = unsigned_type_node;
8480 else if (signed_p && type == char_type_node)
8481 type = signed_char_type_node;
8482 else if (explicit_int128)
8483 type = int128_integer_type_node;
8485 type = long_long_integer_type_node;
8487 type = long_integer_type_node;
8489 type = short_integer_type_node;
8491 if (declspecs->specs[(int)ds_complex])
8493 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
8494 error ("complex invalid for %qs", name);
8495 /* If we just have "complex", it is equivalent to
8496 "complex double", but if any modifiers at all are specified it is
8497 the complex form of TYPE. E.g, "complex short" is
8498 "complex short int". */
8499 else if (defaulted_int && ! longlong && ! explicit_int128
8500 && ! (long_p || short_p || signed_p || unsigned_p))
8501 type = complex_double_type_node;
8502 else if (type == integer_type_node)
8503 type = complex_integer_type_node;
8504 else if (type == float_type_node)
8505 type = complex_float_type_node;
8506 else if (type == double_type_node)
8507 type = complex_double_type_node;
8508 else if (type == long_double_type_node)
8509 type = complex_long_double_type_node;
8511 type = build_complex_type (type);
8514 type_quals = TYPE_UNQUALIFIED;
8515 if (declspecs->specs[(int)ds_const])
8516 type_quals |= TYPE_QUAL_CONST;
8517 if (declspecs->specs[(int)ds_volatile])
8518 type_quals |= TYPE_QUAL_VOLATILE;
8519 if (declspecs->specs[(int)ds_restrict])
8520 type_quals |= TYPE_QUAL_RESTRICT;
8521 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
8522 error ("qualifiers are not allowed on declaration of %<operator %T%>",
8525 type_quals |= cp_type_quals (type);
8526 type = cp_build_qualified_type_real
8527 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
8528 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
8529 /* We might have ignored or rejected some of the qualifiers. */
8530 type_quals = cp_type_quals (type);
8533 inlinep = !! declspecs->specs[(int)ds_inline];
8534 virtualp = !! declspecs->specs[(int)ds_virtual];
8535 explicitp = !! declspecs->specs[(int)ds_explicit];
8537 storage_class = declspecs->storage_class;
8538 if (storage_class == sc_static)
8539 staticp = 1 + (decl_context == FIELD);
8541 if (virtualp && staticp == 2)
8543 error ("member %qD cannot be declared both virtual and static", dname);
8544 storage_class = sc_none;
8547 friendp = !! declspecs->specs[(int)ds_friend];
8549 if (dependent_name && !friendp)
8551 error ("%<%T::%D%> is not a valid declarator", ctype, dependent_name);
8552 return error_mark_node;
8555 /* Issue errors about use of storage classes for parameters. */
8556 if (decl_context == PARM)
8558 if (declspecs->specs[(int)ds_typedef])
8560 error ("typedef declaration invalid in parameter declaration");
8561 return error_mark_node;
8563 else if (template_parm_flag && storage_class != sc_none)
8565 error ("storage class specified for template parameter %qs", name);
8566 return error_mark_node;
8568 else if (storage_class == sc_static
8569 || storage_class == sc_extern
8571 error ("storage class specifiers invalid in parameter declarations");
8573 if (type_uses_auto (type))
8575 error ("parameter declared %<auto%>");
8576 type = error_mark_node;
8579 /* Function parameters cannot be constexpr. If we saw one, moan
8580 and pretend it wasn't there. */
8583 error ("a parameter cannot be declared %<constexpr%>");
8588 /* Give error if `virtual' is used outside of class declaration. */
8590 && (current_class_name == NULL_TREE || decl_context != FIELD))
8592 error ("%<virtual%> outside class declaration");
8596 /* Static anonymous unions are dealt with here. */
8597 if (staticp && decl_context == TYPENAME
8599 && ANON_AGGR_TYPE_P (declspecs->type))
8600 decl_context = FIELD;
8602 /* Warn about storage classes that are invalid for certain
8603 kinds of declarations (parameters, typenames, etc.). */
8606 && storage_class != sc_extern
8607 && storage_class != sc_static)
8608 || declspecs->specs[(int)ds_typedef]))
8610 error ("multiple storage classes in declaration of %qs", name);
8613 if (decl_context != NORMAL
8614 && ((storage_class != sc_none
8615 && storage_class != sc_mutable)
8618 if ((decl_context == PARM || decl_context == CATCHPARM)
8619 && (storage_class == sc_register
8620 || storage_class == sc_auto))
8622 else if (declspecs->specs[(int)ds_typedef])
8624 else if (decl_context == FIELD
8625 /* C++ allows static class elements. */
8626 && storage_class == sc_static)
8627 /* C++ also allows inlines and signed and unsigned elements,
8628 but in those cases we don't come in here. */
8632 if (decl_context == FIELD)
8633 error ("storage class specified for %qs", name);
8636 if (decl_context == PARM || decl_context == CATCHPARM)
8637 error ("storage class specified for parameter %qs", name);
8639 error ("storage class specified for typename");
8641 if (storage_class == sc_register
8642 || storage_class == sc_auto
8643 || storage_class == sc_extern
8645 storage_class = sc_none;
8648 else if (storage_class == sc_extern && funcdef_flag
8649 && ! toplevel_bindings_p ())
8650 error ("nested function %qs declared %<extern%>", name);
8651 else if (toplevel_bindings_p ())
8653 if (storage_class == sc_auto)
8654 error ("top-level declaration of %qs specifies %<auto%>", name);
8657 && storage_class != sc_extern
8658 && storage_class != sc_static)
8660 error ("function-scope %qs implicitly auto and declared %<__thread%>",
8665 if (storage_class && friendp)
8667 error ("storage class specifiers invalid in friend function declarations");
8668 storage_class = sc_none;
8673 unqualified_id = NULL_TREE;
8676 unqualified_id = id_declarator->u.id.unqualified_name;
8677 switch (TREE_CODE (unqualified_id))
8680 unqualified_id = TREE_OPERAND (unqualified_id, 0);
8681 if (TYPE_P (unqualified_id))
8682 unqualified_id = constructor_name (unqualified_id);
8685 case IDENTIFIER_NODE:
8686 case TEMPLATE_ID_EXPR:
8694 /* Determine the type of the entity declared by recurring on the
8696 for (; declarator; declarator = declarator->declarator)
8698 const cp_declarator *inner_declarator;
8701 if (type == error_mark_node)
8702 return error_mark_node;
8704 attrs = declarator->attributes;
8710 if (declarator == NULL || declarator->kind == cdk_id)
8711 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
8712 if (declarator->kind == cdk_function)
8713 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
8714 if (declarator->kind == cdk_array)
8715 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
8716 returned_attrs = decl_attributes (&type,
8717 chainon (returned_attrs, attrs),
8721 if (declarator->kind == cdk_id)
8724 inner_declarator = declarator->declarator;
8726 switch (declarator->kind)
8729 type = create_array_type_for_decl (dname, type,
8730 declarator->u.array.bounds);
8738 /* Declaring a function type.
8739 Make sure we have a valid type for the function to return. */
8741 if (type_quals != TYPE_UNQUALIFIED)
8743 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
8744 warning (OPT_Wignored_qualifiers,
8745 "type qualifiers ignored on function return type");
8746 /* We now know that the TYPE_QUALS don't apply to the
8747 decl, but to its return type. */
8748 type_quals = TYPE_UNQUALIFIED;
8750 errmsg = targetm.invalid_return_type (type);
8754 type = integer_type_node;
8757 /* Error about some types functions can't return. */
8759 if (TREE_CODE (type) == FUNCTION_TYPE)
8761 error ("%qs declared as function returning a function", name);
8762 return error_mark_node;
8764 if (TREE_CODE (type) == ARRAY_TYPE)
8766 error ("%qs declared as function returning an array", name);
8767 return error_mark_node;
8770 /* Pick up type qualifiers which should be applied to `this'. */
8771 memfn_quals = declarator->u.function.qualifiers;
8773 /* Pick up the exception specifications. */
8774 raises = declarator->u.function.exception_specification;
8776 /* Say it's a definition only for the CALL_EXPR
8777 closest to the identifier. */
8778 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
8780 /* Handle a late-specified return type. */
8783 if (type_uses_auto (type))
8785 if (!declarator->u.function.late_return_type)
8787 error ("%qs function uses %<auto%> type specifier without"
8788 " late return type", name);
8789 return error_mark_node;
8791 else if (!is_auto (type))
8793 error ("%qs function with late return type has"
8794 " %qT as its type rather than plain %<auto%>",
8796 return error_mark_node;
8799 else if (declarator->u.function.late_return_type)
8801 error ("%qs function with late return type not declared"
8802 " with %<auto%> type specifier", name);
8803 return error_mark_node;
8806 type = splice_late_return_type
8807 (type, declarator->u.function.late_return_type);
8808 if (type == error_mark_node)
8809 return error_mark_node;
8811 if (ctype == NULL_TREE
8812 && decl_context == FIELD
8814 && (friendp == 0 || dname == current_class_name))
8815 ctype = current_class_type;
8817 if (ctype && (sfk == sfk_constructor
8818 || sfk == sfk_destructor))
8820 /* We are within a class's scope. If our declarator name
8821 is the same as the class name, and we are defining
8822 a function, then it is a constructor/destructor, and
8823 therefore returns a void type. */
8825 /* ISO C++ 12.4/2. A destructor may not be declared
8826 const or volatile. A destructor may not be
8829 ISO C++ 12.1. A constructor may not be declared
8830 const or volatile. A constructor may not be
8831 virtual. A constructor may not be static. */
8833 error ((flags == DTOR_FLAG)
8834 ? "destructor cannot be static member function"
8835 : "constructor cannot be static member function");
8838 error ((flags == DTOR_FLAG)
8839 ? "destructors may not be cv-qualified"
8840 : "constructors may not be cv-qualified");
8841 memfn_quals = TYPE_UNQUALIFIED;
8844 if (decl_context == FIELD
8845 && !member_function_or_else (ctype,
8848 return error_mark_node;
8850 if (flags != DTOR_FLAG)
8852 /* It's a constructor. */
8857 permerror (input_location, "constructors cannot be declared virtual");
8860 if (decl_context == FIELD
8861 && sfk != sfk_constructor)
8862 return error_mark_node;
8864 if (decl_context == FIELD)
8870 error ("can%'t initialize friend function %qs", name);
8873 /* Cannot be both friend and virtual. */
8874 error ("virtual functions cannot be friends");
8877 if (decl_context == NORMAL)
8878 error ("friend declaration not in class definition");
8879 if (current_function_decl && funcdef_flag)
8880 error ("can%'t define friend function %qs in a local "
8884 else if (ctype && sfk == sfk_conversion)
8888 maybe_warn_cpp0x (CPP0X_EXPLICIT_CONVERSION);
8893 arg_types = grokparms (declarator->u.function.parameters,
8896 if (inner_declarator
8897 && inner_declarator->kind == cdk_id
8898 && inner_declarator->u.id.sfk == sfk_destructor
8899 && arg_types != void_list_node)
8901 error ("destructors may not have parameters");
8902 arg_types = void_list_node;
8906 type = build_function_type (type, arg_types);
8913 /* Filter out pointers-to-references and references-to-references.
8914 We can get these if a TYPE_DECL is used. */
8916 if (TREE_CODE (type) == REFERENCE_TYPE)
8918 if (declarator->kind != cdk_reference)
8920 error ("cannot declare pointer to %q#T", type);
8921 type = TREE_TYPE (type);
8924 /* In C++0x, we allow reference to reference declarations
8925 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
8926 and template type arguments [14.3.1/4 temp.arg.type]. The
8927 check for direct reference to reference declarations, which
8928 are still forbidden, occurs below. Reasoning behind the change
8929 can be found in DR106, DR540, and the rvalue reference
8931 else if (cxx_dialect == cxx98)
8933 error ("cannot declare reference to %q#T", type);
8934 type = TREE_TYPE (type);
8937 else if (VOID_TYPE_P (type))
8939 if (declarator->kind == cdk_reference)
8940 error ("cannot declare reference to %q#T", type);
8941 else if (declarator->kind == cdk_ptrmem)
8942 error ("cannot declare pointer to %q#T member", type);
8945 /* We now know that the TYPE_QUALS don't apply to the decl,
8946 but to the target of the pointer. */
8947 type_quals = TYPE_UNQUALIFIED;
8949 if (declarator->kind == cdk_ptrmem
8950 && (TREE_CODE (type) == FUNCTION_TYPE
8951 || (memfn_quals && TREE_CODE (type) == METHOD_TYPE)))
8953 memfn_quals |= type_memfn_quals (type);
8954 type = build_memfn_type (type,
8955 declarator->u.pointer.class_type,
8957 if (type == error_mark_node)
8958 return error_mark_node;
8959 memfn_quals = TYPE_UNQUALIFIED;
8962 if (TREE_CODE (type) == FUNCTION_TYPE
8963 && type_memfn_quals (type) != TYPE_UNQUALIFIED)
8964 error (declarator->kind == cdk_reference
8965 ? G_("cannot declare reference to qualified function type %qT")
8966 : G_("cannot declare pointer to qualified function type %qT"),
8969 /* When the pointed-to type involves components of variable size,
8970 care must be taken to ensure that the size evaluation code is
8971 emitted early enough to dominate all the possible later uses
8972 and late enough for the variables on which it depends to have
8975 This is expected to happen automatically when the pointed-to
8976 type has a name/declaration of it's own, but special attention
8977 is required if the type is anonymous.
8979 We handle the NORMAL and FIELD contexts here by inserting a
8980 dummy statement that just evaluates the size at a safe point
8981 and ensures it is not deferred until e.g. within a deeper
8982 conditional context (c++/43555).
8984 We expect nothing to be needed here for PARM or TYPENAME.
8985 Evaluating the size at this point for TYPENAME would
8986 actually be incorrect, as we might be in the middle of an
8987 expression with side effects on the pointed-to type size
8988 "arguments" prior to the pointer declaration point and the
8989 size evaluation could end up prior to the side effects. */
8991 if (!TYPE_NAME (type)
8992 && (decl_context == NORMAL || decl_context == FIELD)
8993 && at_function_scope_p ()
8994 && variably_modified_type_p (type, NULL_TREE))
8995 finish_expr_stmt (TYPE_SIZE (type));
8997 if (declarator->kind == cdk_reference)
8999 /* In C++0x, the type we are creating a reference to might be
9000 a typedef which is itself a reference type. In that case,
9001 we follow the reference collapsing rules in
9002 [7.1.3/8 dcl.typedef] to create the final reference type:
9004 "If a typedef TD names a type that is a reference to a type
9005 T, an attempt to create the type 'lvalue reference to cv TD'
9006 creates the type 'lvalue reference to T,' while an attempt
9007 to create the type "rvalue reference to cv TD' creates the
9010 if (!VOID_TYPE_P (type))
9011 type = cp_build_reference_type
9012 ((TREE_CODE (type) == REFERENCE_TYPE
9013 ? TREE_TYPE (type) : type),
9014 (declarator->u.reference.rvalue_ref
9015 && (TREE_CODE(type) != REFERENCE_TYPE
9016 || TYPE_REF_IS_RVALUE (type))));
9018 /* In C++0x, we need this check for direct reference to
9019 reference declarations, which are forbidden by
9020 [8.3.2/5 dcl.ref]. Reference to reference declarations
9021 are only allowed indirectly through typedefs and template
9022 type arguments. Example:
9024 void foo(int & &); // invalid ref-to-ref decl
9026 typedef int & int_ref;
9027 void foo(int_ref &); // valid ref-to-ref decl
9029 if (inner_declarator && inner_declarator->kind == cdk_reference)
9030 error ("cannot declare reference to %q#T, which is not "
9031 "a typedef or a template type argument", type);
9033 else if (TREE_CODE (type) == METHOD_TYPE)
9034 type = build_ptrmemfunc_type (build_pointer_type (type));
9035 else if (declarator->kind == cdk_ptrmem)
9037 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
9039 if (declarator->u.pointer.class_type == error_mark_node)
9040 /* We will already have complained. */
9041 type = error_mark_node;
9043 type = build_ptrmem_type (declarator->u.pointer.class_type,
9047 type = build_pointer_type (type);
9049 /* Process a list of type modifier keywords (such as
9050 const or volatile) that were given inside the `*' or `&'. */
9052 if (declarator->u.pointer.qualifiers)
9055 = cp_build_qualified_type (type,
9056 declarator->u.pointer.qualifiers);
9057 type_quals = cp_type_quals (type);
9070 /* A `constexpr' specifier used in an object declaration declares
9071 the object as `const'. */
9072 if (constexpr_p && innermost_code != cdk_function)
9074 if (type_quals & TYPE_QUAL_CONST)
9075 error ("both %<const%> and %<constexpr%> cannot be used here");
9076 if (type_quals & TYPE_QUAL_VOLATILE)
9077 error ("both %<volatile%> and %<constexpr%> cannot be used here");
9078 type_quals |= TYPE_QUAL_CONST;
9079 type = cp_build_qualified_type (type, type_quals);
9082 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
9083 && TREE_CODE (type) != FUNCTION_TYPE
9084 && TREE_CODE (type) != METHOD_TYPE)
9086 error ("template-id %qD used as a declarator",
9088 unqualified_id = dname;
9091 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
9092 qualified with a class-name, turn it into a METHOD_TYPE, unless
9093 we know that the function is static. We take advantage of this
9094 opportunity to do other processing that pertains to entities
9095 explicitly declared to be class members. Note that if DECLARATOR
9096 is non-NULL, we know it is a cdk_id declarator; otherwise, we
9097 would not have exited the loop above. */
9099 && declarator->u.id.qualifying_scope
9100 && TYPE_P (declarator->u.id.qualifying_scope))
9104 ctype = declarator->u.id.qualifying_scope;
9105 ctype = TYPE_MAIN_VARIANT (ctype);
9107 while (t != NULL_TREE && CLASS_TYPE_P (t))
9109 /* You're supposed to have one `template <...>' for every
9110 template class, but you don't need one for a full
9111 specialization. For example:
9113 template <class T> struct S{};
9114 template <> struct S<int> { void f(); };
9115 void S<int>::f () {}
9117 is correct; there shouldn't be a `template <>' for the
9118 definition of `S<int>::f'. */
9119 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
9120 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
9121 /* T is an explicit (not partial) specialization. All
9122 containing classes must therefore also be explicitly
9125 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
9126 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
9127 template_count += 1;
9129 t = TYPE_MAIN_DECL (t);
9130 t = DECL_CONTEXT (t);
9133 if (ctype == current_class_type)
9137 permerror (input_location, "member functions are implicitly friends of their class");
9141 permerror (declarator->id_loc,
9142 "extra qualification %<%T::%> on member %qs",
9145 else if (/* If the qualifying type is already complete, then we
9146 can skip the following checks. */
9147 !COMPLETE_TYPE_P (ctype)
9148 && (/* If the function is being defined, then
9149 qualifying type must certainly be complete. */
9151 /* A friend declaration of "T::f" is OK, even if
9152 "T" is a template parameter. But, if this
9153 function is not a friend, the qualifying type
9155 || (!friendp && !CLASS_TYPE_P (ctype))
9156 /* For a declaration, the type need not be
9157 complete, if either it is dependent (since there
9158 is no meaningful definition of complete in that
9159 case) or the qualifying class is currently being
9161 || !(dependent_type_p (ctype)
9162 || currently_open_class (ctype)))
9163 /* Check that the qualifying type is complete. */
9164 && !complete_type_or_else (ctype, NULL_TREE))
9165 return error_mark_node;
9166 else if (TREE_CODE (type) == FUNCTION_TYPE)
9168 if (current_class_type
9169 && (!friendp || funcdef_flag))
9172 ? "cannot define member function %<%T::%s%> within %<%T%>"
9173 : "cannot declare member function %<%T::%s%> within %<%T%>",
9174 ctype, name, current_class_type);
9175 return error_mark_node;
9178 else if (declspecs->specs[(int)ds_typedef]
9179 && current_class_type)
9181 error ("cannot declare member %<%T::%s%> within %qT",
9182 ctype, name, current_class_type);
9183 return error_mark_node;
9187 if (ctype == NULL_TREE && decl_context == FIELD && friendp == 0)
9188 ctype = current_class_type;
9190 /* A constexpr non-static member function is implicitly const. */
9191 if (constexpr_p && ctype && staticp == 0
9192 && TREE_CODE (type) == FUNCTION_TYPE
9193 && sfk != sfk_constructor && sfk != sfk_destructor)
9194 memfn_quals |= TYPE_QUAL_CONST;
9196 /* Now TYPE has the actual type. */
9201 *attrlist = chainon (returned_attrs, *attrlist);
9203 attrlist = &returned_attrs;
9206 /* Handle parameter packs. */
9207 if (parameter_pack_p)
9209 if (decl_context == PARM)
9210 /* Turn the type into a pack expansion.*/
9211 type = make_pack_expansion (type);
9213 error ("non-parameter %qs cannot be a parameter pack", name);
9216 /* Did array size calculations overflow? */
9218 if (TREE_CODE (type) == ARRAY_TYPE
9219 && COMPLETE_TYPE_P (type)
9220 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
9221 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
9223 error ("size of array %qs is too large", name);
9224 /* If we proceed with the array type as it is, we'll eventually
9225 crash in tree_low_cst(). */
9226 type = error_mark_node;
9229 if ((decl_context == FIELD || decl_context == PARM)
9230 && !processing_template_decl
9231 && variably_modified_type_p (type, NULL_TREE))
9233 if (decl_context == FIELD)
9234 error ("data member may not have variably modified type %qT", type);
9236 error ("parameter may not have variably modified type %qT", type);
9237 type = error_mark_node;
9240 if (explicitp == 1 || (explicitp && friendp))
9242 /* [dcl.fct.spec] The explicit specifier shall only be used in
9243 declarations of constructors within a class definition. */
9244 error ("only declarations of constructors can be %<explicit%>");
9248 if (storage_class == sc_mutable)
9250 if (decl_context != FIELD || friendp)
9252 error ("non-member %qs cannot be declared %<mutable%>", name);
9253 storage_class = sc_none;
9255 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
9257 error ("non-object member %qs cannot be declared %<mutable%>", name);
9258 storage_class = sc_none;
9260 else if (TREE_CODE (type) == FUNCTION_TYPE
9261 || TREE_CODE (type) == METHOD_TYPE)
9263 error ("function %qs cannot be declared %<mutable%>", name);
9264 storage_class = sc_none;
9268 error ("static %qs cannot be declared %<mutable%>", name);
9269 storage_class = sc_none;
9271 else if (type_quals & TYPE_QUAL_CONST)
9273 error ("const %qs cannot be declared %<mutable%>", name);
9274 storage_class = sc_none;
9276 else if (TREE_CODE (type) == REFERENCE_TYPE)
9278 permerror (input_location, "reference %qs cannot be declared "
9279 "%<mutable%>", name);
9280 storage_class = sc_none;
9284 /* If this is declaring a typedef name, return a TYPE_DECL. */
9285 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
9289 /* Note that the grammar rejects storage classes
9290 in typenames, fields or parameters. */
9291 if (current_lang_name == lang_name_java)
9292 TYPE_FOR_JAVA (type) = 1;
9294 /* This declaration:
9296 typedef void f(int) const;
9298 declares a function type which is not a member of any
9299 particular class, but which is cv-qualified; for
9300 example "f S::*" declares a pointer to a const-qualified
9301 member function of S. We record the cv-qualification in the
9303 if (memfn_quals && TREE_CODE (type) == FUNCTION_TYPE)
9305 type = apply_memfn_quals (type, memfn_quals);
9307 /* We have now dealt with these qualifiers. */
9308 memfn_quals = TYPE_UNQUALIFIED;
9311 if (decl_context == FIELD)
9312 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
9314 decl = build_decl (input_location, TYPE_DECL, unqualified_id, type);
9315 if (id_declarator && declarator->u.id.qualifying_scope) {
9316 error_at (DECL_SOURCE_LOCATION (decl),
9317 "typedef name may not be a nested-name-specifier");
9318 TREE_TYPE (decl) = error_mark_node;
9321 if (decl_context != FIELD)
9323 if (!current_function_decl)
9324 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
9325 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
9326 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
9327 (current_function_decl)))
9328 /* The TYPE_DECL is "abstract" because there will be
9329 clones of this constructor/destructor, and there will
9330 be copies of this TYPE_DECL generated in those
9332 DECL_ABSTRACT (decl) = 1;
9334 else if (constructor_name_p (unqualified_id, current_class_type))
9335 permerror (input_location, "ISO C++ forbids nested type %qD with same name "
9336 "as enclosing class",
9339 /* If the user declares "typedef struct {...} foo" then the
9340 struct will have an anonymous name. Fill that name in now.
9341 Nothing can refer to it, so nothing needs know about the name
9343 if (type != error_mark_node
9346 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
9347 && TYPE_ANONYMOUS_P (type)
9348 && cp_type_quals (type) == TYPE_UNQUALIFIED)
9352 /* Replace the anonymous name with the real name everywhere. */
9353 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
9355 if (ANON_AGGRNAME_P (TYPE_IDENTIFIER (t)))
9356 /* We do not rename the debug info representing the
9357 anonymous tagged type because the standard says in
9358 [dcl.typedef] that the naming applies only for
9359 linkage purposes. */
9360 /*debug_hooks->set_name (t, decl);*/
9361 TYPE_NAME (t) = decl;
9364 if (TYPE_LANG_SPECIFIC (type))
9365 TYPE_WAS_ANONYMOUS (type) = 1;
9367 /* If this is a typedef within a template class, the nested
9368 type is a (non-primary) template. The name for the
9369 template needs updating as well. */
9370 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
9371 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
9372 = TYPE_IDENTIFIER (type);
9374 /* Adjust linkage now that we aren't anonymous anymore. */
9375 set_linkage_according_to_type (type, TYPE_MAIN_DECL (type));
9376 determine_visibility (TYPE_MAIN_DECL (type));
9378 /* FIXME remangle member functions; member functions of a
9379 type with external linkage have external linkage. */
9383 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
9384 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
9386 bad_specifiers (decl, BSP_TYPE, virtualp,
9387 memfn_quals != TYPE_UNQUALIFIED,
9388 inlinep, friendp, raises != NULL_TREE);
9393 /* Detect the case of an array type of unspecified size
9394 which came, as such, direct from a typedef name.
9395 We must copy the type, so that the array's domain can be
9396 individually set by the object's initializer. */
9398 if (type && typedef_type
9399 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
9400 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
9401 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
9403 /* Detect where we're using a typedef of function type to declare a
9404 function. PARMS will not be set, so we must create it now. */
9406 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
9408 tree decls = NULL_TREE;
9411 for (args = TYPE_ARG_TYPES (type);
9412 args && args != void_list_node;
9413 args = TREE_CHAIN (args))
9415 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
9417 DECL_CHAIN (decl) = decls;
9421 parms = nreverse (decls);
9423 if (decl_context != TYPENAME)
9425 /* A cv-qualifier-seq shall only be part of the function type
9426 for a non-static member function. [8.3.5/4 dcl.fct] */
9427 if (type_memfn_quals (type) != TYPE_UNQUALIFIED
9428 && (current_class_type == NULL_TREE || staticp) )
9431 ? G_("qualified function types cannot be used to "
9432 "declare static member functions")
9433 : G_("qualified function types cannot be used to "
9434 "declare free functions"));
9435 type = TYPE_MAIN_VARIANT (type);
9438 /* The qualifiers on the function type become the qualifiers on
9439 the non-static member function. */
9440 memfn_quals |= type_memfn_quals (type);
9441 type_quals = TYPE_UNQUALIFIED;
9445 /* If this is a type name (such as, in a cast or sizeof),
9446 compute the type and return it now. */
9448 if (decl_context == TYPENAME)
9450 /* Note that the grammar rejects storage classes
9451 in typenames, fields or parameters. */
9452 if (type_quals != TYPE_UNQUALIFIED)
9453 type_quals = TYPE_UNQUALIFIED;
9455 /* Special case: "friend class foo" looks like a TYPENAME context. */
9458 if (type_quals != TYPE_UNQUALIFIED)
9460 error ("type qualifiers specified for friend class declaration");
9461 type_quals = TYPE_UNQUALIFIED;
9465 error ("%<inline%> specified for friend class declaration");
9471 /* Don't allow friend declaration without a class-key. */
9472 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
9473 permerror (input_location, "template parameters cannot be friends");
9474 else if (TREE_CODE (type) == TYPENAME_TYPE)
9475 permerror (input_location, "friend declaration requires class-key, "
9476 "i.e. %<friend class %T::%D%>",
9477 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
9479 permerror (input_location, "friend declaration requires class-key, "
9480 "i.e. %<friend %#T%>",
9484 /* Only try to do this stuff if we didn't already give up. */
9485 if (type != integer_type_node)
9487 /* A friendly class? */
9488 if (current_class_type)
9489 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
9492 error ("trying to make class %qT a friend of global scope",
9495 type = void_type_node;
9498 else if (memfn_quals)
9500 if (ctype == NULL_TREE
9501 && TREE_CODE (type) == METHOD_TYPE)
9502 ctype = TYPE_METHOD_BASETYPE (type);
9505 type = build_memfn_type (type, ctype, memfn_quals);
9506 /* Core issue #547: need to allow this in template type args. */
9507 else if (template_type_arg && TREE_CODE (type) == FUNCTION_TYPE)
9508 type = apply_memfn_quals (type, memfn_quals);
9510 error ("invalid qualifiers on non-member function type");
9515 else if (unqualified_id == NULL_TREE && decl_context != PARM
9516 && decl_context != CATCHPARM
9517 && TREE_CODE (type) != UNION_TYPE
9520 error ("abstract declarator %qT used as declaration", type);
9521 return error_mark_node;
9524 /* Only functions may be declared using an operator-function-id. */
9526 && IDENTIFIER_OPNAME_P (unqualified_id)
9527 && TREE_CODE (type) != FUNCTION_TYPE
9528 && TREE_CODE (type) != METHOD_TYPE)
9530 error ("declaration of %qD as non-function", unqualified_id);
9531 return error_mark_node;
9534 /* We don't check parameter types here because we can emit a better
9535 error message later. */
9536 if (decl_context != PARM)
9538 type = check_var_type (unqualified_id, type);
9539 if (type == error_mark_node)
9540 return error_mark_node;
9543 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
9544 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
9546 if (decl_context == PARM || decl_context == CATCHPARM)
9548 if (ctype || in_namespace)
9549 error ("cannot use %<::%> in parameter declaration");
9551 /* A parameter declared as an array of T is really a pointer to T.
9552 One declared as a function is really a pointer to a function.
9553 One declared as a member is really a pointer to member. */
9555 if (TREE_CODE (type) == ARRAY_TYPE)
9557 /* Transfer const-ness of array into that of type pointed to. */
9558 type = build_pointer_type (TREE_TYPE (type));
9559 type_quals = TYPE_UNQUALIFIED;
9561 else if (TREE_CODE (type) == FUNCTION_TYPE)
9562 type = build_pointer_type (type);
9565 if (ctype && TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
9566 && !NEW_DELETE_OPNAME_P (unqualified_id))
9567 type = build_memfn_type (type, ctype, memfn_quals);
9572 if (decl_context == PARM)
9574 decl = cp_build_parm_decl (unqualified_id, type);
9576 bad_specifiers (decl, BSP_PARM, virtualp,
9577 memfn_quals != TYPE_UNQUALIFIED,
9578 inlinep, friendp, raises != NULL_TREE);
9580 else if (decl_context == FIELD)
9582 /* The C99 flexible array extension. */
9583 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
9584 && TYPE_DOMAIN (type) == NULL_TREE)
9586 tree itype = compute_array_index_type (dname, integer_zero_node,
9587 tf_warning_or_error);
9588 type = build_cplus_array_type (TREE_TYPE (type), itype);
9591 if (type == error_mark_node)
9593 /* Happens when declaring arrays of sizes which
9594 are error_mark_node, for example. */
9597 else if (in_namespace && !friendp)
9599 /* Something like struct S { int N::j; }; */
9600 error ("invalid use of %<::%>");
9601 return error_mark_node;
9603 else if (TREE_CODE (type) == FUNCTION_TYPE
9604 || TREE_CODE (type) == METHOD_TYPE)
9607 tree function_context;
9611 /* This should never happen in pure C++ (the check
9612 could be an assert). It could happen in
9613 Objective-C++ if someone writes invalid code that
9614 uses a function declaration for an instance
9615 variable or property (instance variables and
9616 properties are parsed as FIELD_DECLs, but they are
9617 part of an Objective-C class, not a C++ class).
9618 That code is invalid and is caught by this
9622 error ("declaration of function %qD in invalid context",
9624 return error_mark_node;
9627 /* ``A union may [ ... ] not [ have ] virtual functions.''
9629 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
9631 error ("function %qD declared virtual inside a union",
9633 return error_mark_node;
9636 if (NEW_DELETE_OPNAME_P (unqualified_id))
9640 error ("%qD cannot be declared virtual, since it "
9648 /* Check that the name used for a destructor makes sense. */
9649 if (sfk == sfk_destructor)
9651 tree uqname = id_declarator->u.id.unqualified_name;
9655 gcc_assert (friendp);
9656 error ("expected qualified name in friend declaration "
9657 "for destructor %qD", uqname);
9658 return error_mark_node;
9661 if (!check_dtor_name (ctype, TREE_OPERAND (uqname, 0)))
9663 error ("declaration of %qD as member of %qT",
9665 return error_mark_node;
9669 error ("a destructor cannot be %<constexpr%>");
9670 return error_mark_node;
9673 else if (sfk == sfk_constructor && friendp && !ctype)
9675 error ("expected qualified name in friend declaration "
9676 "for constructor %qD",
9677 id_declarator->u.id.unqualified_name);
9678 return error_mark_node;
9681 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
9682 function_context = (ctype != NULL_TREE) ?
9683 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
9684 publicp = (! friendp || ! staticp)
9685 && function_context == NULL_TREE;
9686 decl = grokfndecl (ctype, type,
9687 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
9688 ? unqualified_id : dname,
9691 virtualp, flags, memfn_quals, raises,
9692 friendp ? -1 : 0, friendp, publicp,
9693 inlinep | (2 * constexpr_p),
9695 funcdef_flag, template_count, in_namespace,
9696 attrlist, declarator->id_loc);
9697 if (decl == NULL_TREE)
9698 return error_mark_node;
9700 /* This clobbers the attrs stored in `decl' from `attrlist'. */
9701 /* The decl and setting of decl_attr is also turned off. */
9702 decl = build_decl_attribute_variant (decl, decl_attr);
9705 /* [class.conv.ctor]
9707 A constructor declared without the function-specifier
9708 explicit that can be called with a single parameter
9709 specifies a conversion from the type of its first
9710 parameter to the type of its class. Such a constructor
9711 is called a converting constructor. */
9713 DECL_NONCONVERTING_P (decl) = 1;
9715 else if (!staticp && !dependent_type_p (type)
9716 && !COMPLETE_TYPE_P (complete_type (type))
9717 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
9720 error ("field %qD has incomplete type", unqualified_id);
9722 error ("name %qT has incomplete type", type);
9724 /* If we're instantiating a template, tell them which
9725 instantiation made the field's type be incomplete. */
9726 if (current_class_type
9727 && TYPE_NAME (current_class_type)
9728 && IDENTIFIER_TEMPLATE (TYPE_IDENTIFIER (current_class_type))
9730 && declspecs->type == type)
9731 error (" in instantiation of template %qT",
9732 current_class_type);
9734 return error_mark_node;
9740 error ("%qE is neither function nor member function; "
9741 "cannot be declared friend", unqualified_id);
9749 /* Friends are treated specially. */
9750 if (ctype == current_class_type)
9751 ; /* We already issued a permerror. */
9752 else if (decl && DECL_NAME (decl))
9754 if (template_class_depth (current_class_type) == 0)
9756 decl = check_explicit_specialization
9757 (unqualified_id, decl, template_count,
9758 2 * funcdef_flag + 4);
9759 if (decl == error_mark_node)
9760 return error_mark_node;
9763 DECL_DECLARED_CONSTEXPR_P (decl) = constexpr_p;
9764 decl = do_friend (ctype, unqualified_id, decl,
9770 return error_mark_node;
9773 /* Structure field. It may not be a function, except for C++. */
9775 if (decl == NULL_TREE)
9781 /* An attempt is being made to initialize a non-static
9782 member. But, from [class.mem]:
9784 4 A member-declarator can contain a
9785 constant-initializer only if it declares a static
9786 member (_class.static_) of integral or enumeration
9787 type, see _class.static.data_.
9789 This used to be relatively common practice, but
9790 the rest of the compiler does not correctly
9791 handle the initialization unless the member is
9792 static so we make it static below. */
9793 if (cxx_dialect >= cxx0x)
9795 sorry ("non-static data member initializers");
9799 permerror (input_location, "ISO C++ forbids initialization of member %qD",
9801 permerror (input_location, "making %qD static", unqualified_id);
9806 if (uses_template_parms (type))
9807 /* We'll check at instantiation time. */
9809 else if (constexpr_p)
9810 /* constexpr has the same requirements. */
9812 else if (check_static_variable_definition (unqualified_id,
9814 /* If we just return the declaration, crashes
9815 will sometimes occur. We therefore return
9816 void_type_node, as if this was a friend
9817 declaration, to cause callers to completely
9818 ignore this declaration. */
9819 return error_mark_node;
9824 /* C++ allows static class members. All other work
9825 for this is done by grokfield. */
9826 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
9827 set_linkage_for_static_data_member (decl);
9828 /* Even if there is an in-class initialization, DECL
9829 is considered undefined until an out-of-class
9830 definition is provided. */
9831 DECL_EXTERNAL (decl) = 1;
9834 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
9836 if (constexpr_p && !initialized)
9838 error ("constexpr static data member %qD must have an "
9839 "initializer", decl);
9840 constexpr_p = false;
9847 error ("non-static data member %qE declared %<constexpr%>",
9849 constexpr_p = false;
9851 decl = build_decl (input_location,
9852 FIELD_DECL, unqualified_id, type);
9853 DECL_NONADDRESSABLE_P (decl) = bitfield;
9854 if (bitfield && !unqualified_id)
9855 TREE_NO_WARNING (decl) = 1;
9857 if (storage_class == sc_mutable)
9859 DECL_MUTABLE_P (decl) = 1;
9860 storage_class = sc_none;
9864 bad_specifiers (decl, BSP_FIELD, virtualp,
9865 memfn_quals != TYPE_UNQUALIFIED,
9866 inlinep, friendp, raises != NULL_TREE);
9869 else if (TREE_CODE (type) == FUNCTION_TYPE
9870 || TREE_CODE (type) == METHOD_TYPE)
9875 if (!unqualified_id)
9876 return error_mark_node;
9878 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
9879 original_name = dname;
9881 original_name = unqualified_id;
9883 if (storage_class == sc_auto)
9884 error ("storage class %<auto%> invalid for function %qs", name);
9885 else if (storage_class == sc_register)
9886 error ("storage class %<register%> invalid for function %qs", name);
9888 error ("storage class %<__thread%> invalid for function %qs", name);
9890 /* Function declaration not at top level.
9891 Storage classes other than `extern' are not allowed
9892 and `extern' makes no difference. */
9893 if (! toplevel_bindings_p ()
9894 && (storage_class == sc_static
9895 || declspecs->specs[(int)ds_inline])
9898 if (storage_class == sc_static)
9899 pedwarn (input_location, OPT_pedantic,
9900 "%<static%> specified invalid for function %qs "
9901 "declared out of global scope", name);
9903 pedwarn (input_location, OPT_pedantic,
9904 "%<inline%> specifier invalid for function %qs "
9905 "declared out of global scope", name);
9908 if (ctype != NULL_TREE
9909 && TREE_CODE (ctype) != NAMESPACE_DECL && !MAYBE_CLASS_TYPE_P (ctype))
9911 error ("%q#T is not a class or a namespace", ctype);
9915 if (ctype == NULL_TREE)
9919 error ("virtual non-class function %qs", name);
9922 else if (sfk == sfk_constructor
9923 || sfk == sfk_destructor)
9926 ? "%qs defined in a non-class scope"
9927 : "%qs declared in a non-class scope", name);
9932 /* Record presence of `static'. */
9933 publicp = (ctype != NULL_TREE
9934 || storage_class == sc_extern
9935 || storage_class != sc_static);
9937 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
9938 virtualp, flags, memfn_quals, raises,
9940 publicp, inlinep | (2 * constexpr_p), sfk,
9942 template_count, in_namespace, attrlist,
9943 declarator->id_loc);
9944 if (decl == NULL_TREE)
9945 return error_mark_node;
9949 int invalid_static = 0;
9951 /* Don't allow a static member function in a class, and forbid
9952 declaring main to be static. */
9953 if (TREE_CODE (type) == METHOD_TYPE)
9955 permerror (input_location, "cannot declare member function %qD to have "
9956 "static linkage", decl);
9959 else if (current_function_decl)
9961 /* FIXME need arm citation */
9962 error ("cannot declare static function inside another function");
9969 storage_class = sc_none;
9975 /* It's a variable. */
9977 /* An uninitialized decl with `extern' is a reference. */
9978 decl = grokvardecl (type, unqualified_id,
9981 (type_quals & TYPE_QUAL_CONST) != 0,
9982 ctype ? ctype : in_namespace);
9983 bad_specifiers (decl, BSP_VAR, virtualp,
9984 memfn_quals != TYPE_UNQUALIFIED,
9985 inlinep, friendp, raises != NULL_TREE);
9989 DECL_CONTEXT (decl) = ctype;
9992 permerror (input_location, "%<static%> may not be used when defining "
9993 "(as opposed to declaring) a static data member");
9995 storage_class = sc_none;
9997 if (storage_class == sc_register && TREE_STATIC (decl))
9999 error ("static member %qD declared %<register%>", decl);
10000 storage_class = sc_none;
10002 if (storage_class == sc_extern && pedantic)
10004 pedwarn (input_location, OPT_pedantic,
10005 "cannot explicitly declare member %q#D to have "
10006 "extern linkage", decl);
10007 storage_class = sc_none;
10010 else if (constexpr_p && DECL_EXTERNAL (decl))
10011 error ("declaration of constexpr variable %qD is not a definition",
10015 if (storage_class == sc_extern && initialized && !funcdef_flag)
10017 if (toplevel_bindings_p ())
10019 /* It's common practice (and completely valid) to have a const
10020 be initialized and declared extern. */
10021 if (!(type_quals & TYPE_QUAL_CONST))
10022 warning (0, "%qs initialized and declared %<extern%>", name);
10026 error ("%qs has both %<extern%> and initializer", name);
10027 return error_mark_node;
10031 /* Record `register' declaration for warnings on &
10032 and in case doing stupid register allocation. */
10034 if (storage_class == sc_register)
10035 DECL_REGISTER (decl) = 1;
10036 else if (storage_class == sc_extern)
10037 DECL_THIS_EXTERN (decl) = 1;
10038 else if (storage_class == sc_static)
10039 DECL_THIS_STATIC (decl) = 1;
10041 /* Don't forget constexprness. */
10043 DECL_DECLARED_CONSTEXPR_P (decl) = true;
10045 /* Record constancy and volatility on the DECL itself . There's
10046 no need to do this when processing a template; we'll do this
10047 for the instantiated declaration based on the type of DECL. */
10048 if (!processing_template_decl)
10049 cp_apply_type_quals_to_decl (type_quals, decl);
10055 /* Subroutine of start_function. Ensure that each of the parameter
10056 types (as listed in PARMS) is complete, as is required for a
10057 function definition. */
10060 require_complete_types_for_parms (tree parms)
10062 for (; parms; parms = DECL_CHAIN (parms))
10064 if (dependent_type_p (TREE_TYPE (parms)))
10066 if (!VOID_TYPE_P (TREE_TYPE (parms))
10067 && complete_type_or_else (TREE_TYPE (parms), parms))
10069 relayout_decl (parms);
10070 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
10073 /* grokparms or complete_type_or_else will have already issued
10075 TREE_TYPE (parms) = error_mark_node;
10079 /* Returns nonzero if T is a local variable. */
10082 local_variable_p (const_tree t)
10084 if ((TREE_CODE (t) == VAR_DECL
10085 /* A VAR_DECL with a context that is a _TYPE is a static data
10087 && !TYPE_P (CP_DECL_CONTEXT (t))
10088 /* Any other non-local variable must be at namespace scope. */
10089 && !DECL_NAMESPACE_SCOPE_P (t))
10090 || (TREE_CODE (t) == PARM_DECL))
10096 /* Like local_variable_p, but suitable for use as a tree-walking
10100 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
10101 void *data ATTRIBUTE_UNUSED)
10103 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
10105 else if (TYPE_P (*tp))
10106 *walk_subtrees = 0;
10112 /* Check that ARG, which is a default-argument expression for a
10113 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
10114 something goes wrong. DECL may also be a _TYPE node, rather than a
10115 DECL, if there is no DECL available. */
10118 check_default_argument (tree decl, tree arg)
10123 if (TREE_CODE (arg) == DEFAULT_ARG)
10124 /* We get a DEFAULT_ARG when looking at an in-class declaration
10125 with a default argument. Ignore the argument for now; we'll
10126 deal with it after the class is complete. */
10135 decl_type = TREE_TYPE (decl);
10137 if (arg == error_mark_node
10138 || decl == error_mark_node
10139 || TREE_TYPE (arg) == error_mark_node
10140 || decl_type == error_mark_node)
10141 /* Something already went wrong. There's no need to check
10143 return error_mark_node;
10145 /* [dcl.fct.default]
10147 A default argument expression is implicitly converted to the
10149 if (!TREE_TYPE (arg)
10150 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
10153 error ("default argument for %q#D has type %qT",
10154 decl, TREE_TYPE (arg));
10156 error ("default argument for parameter of type %qT has type %qT",
10157 decl_type, TREE_TYPE (arg));
10159 return error_mark_node;
10162 /* [dcl.fct.default]
10164 Local variables shall not be used in default argument
10167 The keyword `this' shall not be used in a default argument of a
10168 member function. */
10169 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
10172 error ("default argument %qE uses local variable %qD", arg, var);
10173 return error_mark_node;
10180 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
10183 type_is_deprecated (tree type)
10185 enum tree_code code;
10186 if (TREE_DEPRECATED (type))
10188 if (TYPE_NAME (type)
10189 && TREE_DEPRECATED (TYPE_NAME (type)))
10192 /* Do warn about using typedefs to a deprecated class. */
10193 if (TAGGED_TYPE_P (type) && type != TYPE_MAIN_VARIANT (type))
10194 return type_is_deprecated (TYPE_MAIN_VARIANT (type));
10196 code = TREE_CODE (type);
10198 if (code == POINTER_TYPE || code == REFERENCE_TYPE
10199 || code == OFFSET_TYPE || code == FUNCTION_TYPE
10200 || code == METHOD_TYPE || code == ARRAY_TYPE)
10201 return type_is_deprecated (TREE_TYPE (type));
10203 if (TYPE_PTRMEMFUNC_P (type))
10204 return type_is_deprecated
10205 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type))));
10210 /* Decode the list of parameter types for a function type.
10211 Given the list of things declared inside the parens,
10212 return a list of types.
10214 If this parameter does not end with an ellipsis, we append
10217 *PARMS is set to the chain of PARM_DECLs created. */
10220 grokparms (tree parmlist, tree *parms)
10222 tree result = NULL_TREE;
10223 tree decls = NULL_TREE;
10227 for (parm = parmlist; parm != NULL_TREE; parm = TREE_CHAIN (parm))
10229 tree type = NULL_TREE;
10230 tree init = TREE_PURPOSE (parm);
10231 tree decl = TREE_VALUE (parm);
10232 const char *errmsg;
10234 if (parm == void_list_node)
10237 if (! decl || TREE_TYPE (decl) == error_mark_node)
10240 type = TREE_TYPE (decl);
10241 if (VOID_TYPE_P (type))
10243 if (same_type_p (type, void_type_node)
10244 && DECL_SELF_REFERENCE_P (type)
10245 && !DECL_NAME (decl) && !result && TREE_CHAIN (parm) == void_list_node)
10246 /* this is a parmlist of `(void)', which is ok. */
10248 cxx_incomplete_type_error (decl, type);
10249 /* It's not a good idea to actually create parameters of
10250 type `void'; other parts of the compiler assume that a
10251 void type terminates the parameter list. */
10252 type = error_mark_node;
10253 TREE_TYPE (decl) = error_mark_node;
10256 if (type != error_mark_node
10257 && TYPE_FOR_JAVA (type)
10258 && MAYBE_CLASS_TYPE_P (type))
10260 error ("parameter %qD has Java class type", decl);
10261 type = error_mark_node;
10262 TREE_TYPE (decl) = error_mark_node;
10266 if (type != error_mark_node
10267 && (errmsg = targetm.invalid_parameter_type (type)))
10270 type = error_mark_node;
10271 TREE_TYPE (decl) = error_mark_node;
10274 if (type != error_mark_node)
10276 if (deprecated_state != DEPRECATED_SUPPRESS)
10278 tree deptype = type_is_deprecated (type);
10280 warn_deprecated_use (deptype, NULL_TREE);
10283 /* Top-level qualifiers on the parameters are
10284 ignored for function types. */
10285 type = cp_build_qualified_type (type, 0);
10286 if (TREE_CODE (type) == METHOD_TYPE)
10288 error ("parameter %qD invalidly declared method type", decl);
10289 type = build_pointer_type (type);
10290 TREE_TYPE (decl) = type;
10292 else if (abstract_virtuals_error (decl, type))
10293 any_error = 1; /* Seems like a good idea. */
10294 else if (POINTER_TYPE_P (type))
10296 /* [dcl.fct]/6, parameter types cannot contain pointers
10297 (references) to arrays of unknown bound. */
10298 tree t = TREE_TYPE (type);
10299 int ptr = TYPE_PTR_P (type);
10303 if (TYPE_PTR_P (t))
10305 else if (TREE_CODE (t) != ARRAY_TYPE)
10307 else if (!TYPE_DOMAIN (t))
10311 if (TREE_CODE (t) == ARRAY_TYPE)
10313 ? G_("parameter %qD includes pointer to array of "
10314 "unknown bound %qT")
10315 : G_("parameter %qD includes reference to array of "
10316 "unknown bound %qT"),
10322 else if (init && !processing_template_decl)
10323 init = check_default_argument (decl, init);
10326 if (TREE_CODE (decl) == PARM_DECL
10327 && FUNCTION_PARAMETER_PACK_P (decl)
10328 && TREE_CHAIN (parm)
10329 && TREE_CHAIN (parm) != void_list_node)
10330 error ("parameter packs must be at the end of the parameter list");
10332 DECL_CHAIN (decl) = decls;
10334 result = tree_cons (init, type, result);
10336 decls = nreverse (decls);
10337 result = nreverse (result);
10339 result = chainon (result, void_list_node);
10346 /* D is a constructor or overloaded `operator='.
10348 Let T be the class in which D is declared. Then, this function
10351 -1 if D's is an ill-formed constructor or copy assignment operator
10352 whose first parameter is of type `T'.
10353 0 if D is not a copy constructor or copy assignment
10355 1 if D is a copy constructor or copy assignment operator whose
10356 first parameter is a reference to non-const qualified T.
10357 2 if D is a copy constructor or copy assignment operator whose
10358 first parameter is a reference to const qualified T.
10360 This function can be used as a predicate. Positive values indicate
10361 a copy constructor and nonzero values indicate a copy assignment
10365 copy_fn_p (const_tree d)
10371 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10373 if (TREE_CODE (d) == TEMPLATE_DECL
10374 || (DECL_TEMPLATE_INFO (d)
10375 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10376 /* Instantiations of template member functions are never copy
10377 functions. Note that member functions of templated classes are
10378 represented as template functions internally, and we must
10379 accept those as copy functions. */
10382 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10386 arg_type = TREE_VALUE (args);
10387 if (arg_type == error_mark_node)
10390 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
10392 /* Pass by value copy assignment operator. */
10395 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
10396 && !TYPE_REF_IS_RVALUE (arg_type)
10397 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
10399 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
10405 args = TREE_CHAIN (args);
10407 if (args && args != void_list_node && !TREE_PURPOSE (args))
10408 /* There are more non-optional args. */
10414 /* D is a constructor or overloaded `operator='.
10416 Let T be the class in which D is declared. Then, this function
10417 returns true when D is a move constructor or move assignment
10418 operator, false otherwise. */
10421 move_fn_p (const_tree d)
10425 bool result = false;
10427 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10429 if (cxx_dialect == cxx98)
10430 /* There are no move constructors if we are in C++98 mode. */
10433 if (TREE_CODE (d) == TEMPLATE_DECL
10434 || (DECL_TEMPLATE_INFO (d)
10435 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10436 /* Instantiations of template member functions are never copy
10437 functions. Note that member functions of templated classes are
10438 represented as template functions internally, and we must
10439 accept those as copy functions. */
10442 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10446 arg_type = TREE_VALUE (args);
10447 if (arg_type == error_mark_node)
10450 if (TREE_CODE (arg_type) == REFERENCE_TYPE
10451 && TYPE_REF_IS_RVALUE (arg_type)
10452 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
10456 args = TREE_CHAIN (args);
10458 if (args && args != void_list_node && !TREE_PURPOSE (args))
10459 /* There are more non-optional args. */
10465 /* Remember any special properties of member function DECL. */
10468 grok_special_member_properties (tree decl)
10472 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
10475 class_type = DECL_CONTEXT (decl);
10476 if (DECL_CONSTRUCTOR_P (decl))
10478 int ctor = copy_fn_p (decl);
10480 if (!DECL_ARTIFICIAL (decl))
10481 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
10487 A non-template constructor for class X is a copy
10488 constructor if its first parameter is of type X&, const
10489 X&, volatile X& or const volatile X&, and either there
10490 are no other parameters or else all other parameters have
10491 default arguments. */
10492 TYPE_HAS_COPY_CTOR (class_type) = 1;
10493 if (user_provided_p (decl))
10494 TYPE_HAS_COMPLEX_COPY_CTOR (class_type) = 1;
10496 TYPE_HAS_CONST_COPY_CTOR (class_type) = 1;
10498 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
10500 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
10501 if (user_provided_p (decl))
10502 TYPE_HAS_COMPLEX_DFLT (class_type) = 1;
10504 else if (move_fn_p (decl) && user_provided_p (decl))
10505 TYPE_HAS_COMPLEX_MOVE_CTOR (class_type) = 1;
10506 else if (is_list_ctor (decl))
10507 TYPE_HAS_LIST_CTOR (class_type) = 1;
10509 if (DECL_DECLARED_CONSTEXPR_P (decl)
10510 && !copy_fn_p (decl) && !move_fn_p (decl))
10511 TYPE_HAS_CONSTEXPR_CTOR (class_type) = 1;
10513 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
10517 A non-template assignment operator for class X is a copy
10518 assignment operator if its parameter is of type X, X&, const
10519 X&, volatile X& or const volatile X&. */
10521 int assop = copy_fn_p (decl);
10525 TYPE_HAS_COPY_ASSIGN (class_type) = 1;
10526 if (user_provided_p (decl))
10527 TYPE_HAS_COMPLEX_COPY_ASSIGN (class_type) = 1;
10529 TYPE_HAS_CONST_COPY_ASSIGN (class_type) = 1;
10531 else if (move_fn_p (decl) && user_provided_p (decl))
10532 TYPE_HAS_COMPLEX_MOVE_ASSIGN (class_type) = 1;
10534 /* Destructors are handled in check_methods. */
10537 /* Check a constructor DECL has the correct form. Complains
10538 if the class has a constructor of the form X(X). */
10541 grok_ctor_properties (const_tree ctype, const_tree decl)
10543 int ctor_parm = copy_fn_p (decl);
10549 A declaration of a constructor for a class X is ill-formed if
10550 its first parameter is of type (optionally cv-qualified) X
10551 and either there are no other parameters or else all other
10552 parameters have default arguments.
10554 We *don't* complain about member template instantiations that
10555 have this form, though; they can occur as we try to decide
10556 what constructor to use during overload resolution. Since
10557 overload resolution will never prefer such a constructor to
10558 the non-template copy constructor (which is either explicitly
10559 or implicitly defined), there's no need to worry about their
10560 existence. Theoretically, they should never even be
10561 instantiated, but that's hard to forestall. */
10562 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
10570 /* An operator with this code is unary, but can also be binary. */
10573 ambi_op_p (enum tree_code code)
10575 return (code == INDIRECT_REF
10576 || code == ADDR_EXPR
10577 || code == UNARY_PLUS_EXPR
10578 || code == NEGATE_EXPR
10579 || code == PREINCREMENT_EXPR
10580 || code == PREDECREMENT_EXPR);
10583 /* An operator with this name can only be unary. */
10586 unary_op_p (enum tree_code code)
10588 return (code == TRUTH_NOT_EXPR
10589 || code == BIT_NOT_EXPR
10590 || code == COMPONENT_REF
10591 || code == TYPE_EXPR);
10594 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
10595 errors are issued for invalid declarations. */
10598 grok_op_properties (tree decl, bool complain)
10600 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
10602 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
10603 tree name = DECL_NAME (decl);
10604 enum tree_code operator_code;
10609 /* Count the number of arguments and check for ellipsis. */
10610 for (argtype = argtypes, arity = 0;
10611 argtype && argtype != void_list_node;
10612 argtype = TREE_CHAIN (argtype))
10614 ellipsis_p = !argtype;
10616 class_type = DECL_CONTEXT (decl);
10617 if (class_type && !CLASS_TYPE_P (class_type))
10618 class_type = NULL_TREE;
10620 if (DECL_CONV_FN_P (decl))
10621 operator_code = TYPE_EXPR;
10625 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
10626 if (ansi_opname (CODE) == name) \
10628 operator_code = (CODE); \
10631 else if (ansi_assopname (CODE) == name) \
10633 operator_code = (CODE); \
10634 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
10638 #include "operators.def"
10639 #undef DEF_OPERATOR
10641 gcc_unreachable ();
10644 gcc_assert (operator_code != MAX_TREE_CODES);
10645 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10648 switch (operator_code)
10651 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
10655 TYPE_GETS_DELETE (class_type) |= 1;
10659 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
10662 case VEC_DELETE_EXPR:
10663 TYPE_GETS_DELETE (class_type) |= 2;
10670 /* [basic.std.dynamic.allocation]/1:
10672 A program is ill-formed if an allocation function is declared
10673 in a namespace scope other than global scope or declared static
10676 The same also holds true for deallocation functions. */
10677 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
10678 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10680 if (DECL_NAMESPACE_SCOPE_P (decl))
10682 if (CP_DECL_CONTEXT (decl) != global_namespace)
10684 error ("%qD may not be declared within a namespace", decl);
10687 else if (!TREE_PUBLIC (decl))
10689 error ("%qD may not be declared as static", decl);
10695 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
10697 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
10698 DECL_IS_OPERATOR_NEW (decl) = 1;
10700 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10701 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
10704 /* An operator function must either be a non-static member function
10705 or have at least one parameter of a class, a reference to a class,
10706 an enumeration, or a reference to an enumeration. 13.4.0.6 */
10707 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
10709 if (operator_code == TYPE_EXPR
10710 || operator_code == CALL_EXPR
10711 || operator_code == COMPONENT_REF
10712 || operator_code == ARRAY_REF
10713 || operator_code == NOP_EXPR)
10715 error ("%qD must be a nonstatic member function", decl);
10722 if (DECL_STATIC_FUNCTION_P (decl))
10724 error ("%qD must be either a non-static member "
10725 "function or a non-member function", decl);
10729 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
10731 tree arg = non_reference (TREE_VALUE (p));
10732 if (arg == error_mark_node)
10735 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
10736 because these checks are performed even on
10737 template functions. */
10738 if (MAYBE_CLASS_TYPE_P (arg)
10739 || TREE_CODE (arg) == ENUMERAL_TYPE)
10743 if (!p || p == void_list_node)
10746 error ("%qD must have an argument of class or "
10747 "enumerated type", decl);
10753 /* There are no restrictions on the arguments to an overloaded
10755 if (operator_code == CALL_EXPR)
10758 /* Warn about conversion operators that will never be used. */
10759 if (IDENTIFIER_TYPENAME_P (name)
10760 && ! DECL_TEMPLATE_INFO (decl)
10762 /* Warn only declaring the function; there is no need to
10763 warn again about out-of-class definitions. */
10764 && class_type == current_class_type)
10766 tree t = TREE_TYPE (name);
10767 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
10770 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
10772 if (TREE_CODE (t) == VOID_TYPE)
10773 warning (OPT_Wconversion,
10775 ? G_("conversion to a reference to void "
10776 "will never use a type conversion operator")
10777 : G_("conversion to void "
10778 "will never use a type conversion operator"));
10779 else if (class_type)
10781 if (t == class_type)
10782 warning (OPT_Wconversion,
10784 ? G_("conversion to a reference to the same type "
10785 "will never use a type conversion operator")
10786 : G_("conversion to the same type "
10787 "will never use a type conversion operator"));
10788 /* Don't force t to be complete here. */
10789 else if (MAYBE_CLASS_TYPE_P (t)
10790 && COMPLETE_TYPE_P (t)
10791 && DERIVED_FROM_P (t, class_type))
10792 warning (OPT_Wconversion,
10794 ? G_("conversion to a reference to a base class "
10795 "will never use a type conversion operator")
10796 : G_("conversion to a base class "
10797 "will never use a type conversion operator"));
10802 if (operator_code == COND_EXPR)
10805 error ("ISO C++ prohibits overloading operator ?:");
10808 else if (ellipsis_p)
10810 error ("%qD must not have variable number of arguments", decl);
10813 else if (ambi_op_p (operator_code))
10816 /* We pick the one-argument operator codes by default, so
10817 we don't have to change anything. */
10819 else if (arity == 2)
10821 /* If we thought this was a unary operator, we now know
10822 it to be a binary operator. */
10823 switch (operator_code)
10826 operator_code = MULT_EXPR;
10830 operator_code = BIT_AND_EXPR;
10833 case UNARY_PLUS_EXPR:
10834 operator_code = PLUS_EXPR;
10838 operator_code = MINUS_EXPR;
10841 case PREINCREMENT_EXPR:
10842 operator_code = POSTINCREMENT_EXPR;
10845 case PREDECREMENT_EXPR:
10846 operator_code = POSTDECREMENT_EXPR;
10850 gcc_unreachable ();
10853 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10855 if ((operator_code == POSTINCREMENT_EXPR
10856 || operator_code == POSTDECREMENT_EXPR)
10857 && ! processing_template_decl
10858 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
10861 error ("postfix %qD must take %<int%> as its argument",
10864 error ("postfix %qD must take %<int%> as its second "
10872 error ("%qD must take either zero or one argument", decl);
10874 error ("%qD must take either one or two arguments", decl);
10878 /* More Effective C++ rule 6. */
10880 && (operator_code == POSTINCREMENT_EXPR
10881 || operator_code == POSTDECREMENT_EXPR
10882 || operator_code == PREINCREMENT_EXPR
10883 || operator_code == PREDECREMENT_EXPR))
10885 tree arg = TREE_VALUE (argtypes);
10886 tree ret = TREE_TYPE (TREE_TYPE (decl));
10887 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
10888 arg = TREE_TYPE (arg);
10889 arg = TYPE_MAIN_VARIANT (arg);
10890 if (operator_code == PREINCREMENT_EXPR
10891 || operator_code == PREDECREMENT_EXPR)
10893 if (TREE_CODE (ret) != REFERENCE_TYPE
10894 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
10896 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
10897 build_reference_type (arg));
10901 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
10902 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
10906 else if (unary_op_p (operator_code))
10911 error ("%qD must take %<void%>", decl);
10913 error ("%qD must take exactly one argument", decl);
10917 else /* if (binary_op_p (operator_code)) */
10922 error ("%qD must take exactly one argument", decl);
10924 error ("%qD must take exactly two arguments", decl);
10928 /* More Effective C++ rule 7. */
10930 && (operator_code == TRUTH_ANDIF_EXPR
10931 || operator_code == TRUTH_ORIF_EXPR
10932 || operator_code == COMPOUND_EXPR))
10933 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
10937 /* Effective C++ rule 23. */
10940 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
10941 && (operator_code == PLUS_EXPR
10942 || operator_code == MINUS_EXPR
10943 || operator_code == TRUNC_DIV_EXPR
10944 || operator_code == MULT_EXPR
10945 || operator_code == TRUNC_MOD_EXPR)
10946 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
10947 warning (OPT_Weffc__, "%qD should return by value", decl);
10949 /* [over.oper]/8 */
10950 for (; argtypes && argtypes != void_list_node;
10951 argtypes = TREE_CHAIN (argtypes))
10952 if (TREE_PURPOSE (argtypes))
10954 TREE_PURPOSE (argtypes) = NULL_TREE;
10955 if (operator_code == POSTINCREMENT_EXPR
10956 || operator_code == POSTDECREMENT_EXPR)
10958 pedwarn (input_location, OPT_pedantic, "%qD cannot have default arguments",
10963 error ("%qD cannot have default arguments", decl);
10971 /* Return a string giving the keyword associate with CODE. */
10973 static const char *
10974 tag_name (enum tag_types code)
10986 case typename_type:
10989 gcc_unreachable ();
10993 /* Name lookup in an elaborated-type-specifier (after the keyword
10994 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
10995 elaborated-type-specifier is invalid, issue a diagnostic and return
10996 error_mark_node; otherwise, return the *_TYPE to which it referred.
10997 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
11000 check_elaborated_type_specifier (enum tag_types tag_code,
11002 bool allow_template_p)
11008 struct S { struct S *p; };
11010 name lookup will find the TYPE_DECL for the implicit "S::S"
11011 typedef. Adjust for that here. */
11012 if (DECL_SELF_REFERENCE_P (decl))
11013 decl = TYPE_NAME (TREE_TYPE (decl));
11015 type = TREE_TYPE (decl);
11017 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
11018 is false for this case as well. */
11019 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
11021 error ("using template type parameter %qT after %qs",
11022 type, tag_name (tag_code));
11023 return error_mark_node;
11027 If the identifier resolves to a typedef-name or a template
11028 type-parameter, the elaborated-type-specifier is ill-formed.
11030 In other words, the only legitimate declaration to use in the
11031 elaborated type specifier is the implicit typedef created when
11032 the type is declared. */
11033 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
11034 && !DECL_SELF_REFERENCE_P (decl)
11035 && tag_code != typename_type)
11037 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
11038 error ("%q+D has a previous declaration here", decl);
11039 return error_mark_node;
11041 else if (TREE_CODE (type) != RECORD_TYPE
11042 && TREE_CODE (type) != UNION_TYPE
11043 && tag_code != enum_type
11044 && tag_code != typename_type)
11046 error ("%qT referred to as %qs", type, tag_name (tag_code));
11047 error ("%q+T has a previous declaration here", type);
11048 return error_mark_node;
11050 else if (TREE_CODE (type) != ENUMERAL_TYPE
11051 && tag_code == enum_type)
11053 error ("%qT referred to as enum", type);
11054 error ("%q+T has a previous declaration here", type);
11055 return error_mark_node;
11057 else if (!allow_template_p
11058 && TREE_CODE (type) == RECORD_TYPE
11059 && CLASSTYPE_IS_TEMPLATE (type))
11061 /* If a class template appears as elaborated type specifier
11062 without a template header such as:
11064 template <class T> class C {};
11065 void f(class C); // No template header here
11067 then the required template argument is missing. */
11068 error ("template argument required for %<%s %T%>",
11069 tag_name (tag_code),
11070 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
11071 return error_mark_node;
11077 /* Lookup NAME in elaborate type specifier in scope according to
11078 SCOPE and issue diagnostics if necessary.
11079 Return *_TYPE node upon success, NULL_TREE when the NAME is not
11080 found, and ERROR_MARK_NODE for type error. */
11083 lookup_and_check_tag (enum tag_types tag_code, tree name,
11084 tag_scope scope, bool template_header_p)
11088 if (scope == ts_global)
11090 /* First try ordinary name lookup, ignoring hidden class name
11091 injected via friend declaration. */
11092 decl = lookup_name_prefer_type (name, 2);
11093 /* If that fails, the name will be placed in the smallest
11094 non-class, non-function-prototype scope according to 3.3.1/5.
11095 We may already have a hidden name declared as friend in this
11096 scope. So lookup again but not ignoring hidden names.
11097 If we find one, that name will be made visible rather than
11098 creating a new tag. */
11100 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
11103 decl = lookup_type_scope (name, scope);
11105 if (decl && DECL_CLASS_TEMPLATE_P (decl))
11106 decl = DECL_TEMPLATE_RESULT (decl);
11108 if (decl && TREE_CODE (decl) == TYPE_DECL)
11110 /* Look for invalid nested type:
11114 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
11116 error ("%qD has the same name as the class in which it is "
11119 return error_mark_node;
11122 /* Two cases we need to consider when deciding if a class
11123 template is allowed as an elaborated type specifier:
11124 1. It is a self reference to its own class.
11125 2. It comes with a template header.
11129 template <class T> class C {
11130 class C *c1; // DECL_SELF_REFERENCE_P is true
11133 template <class U> class C; // template_header_p is true
11134 template <class T> class C<T>::D {
11135 class C *c2; // DECL_SELF_REFERENCE_P is true
11138 t = check_elaborated_type_specifier (tag_code,
11141 | DECL_SELF_REFERENCE_P (decl));
11144 else if (decl && TREE_CODE (decl) == TREE_LIST)
11146 error ("reference to %qD is ambiguous", name);
11147 print_candidates (decl);
11148 return error_mark_node;
11154 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
11155 Define the tag as a forward-reference if it is not defined.
11157 If a declaration is given, process it here, and report an error if
11158 multiple declarations are not identical.
11160 SCOPE is TS_CURRENT when this is also a definition. Only look in
11161 the current frame for the name (since C++ allows new names in any
11162 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
11163 declaration. Only look beginning from the current scope outward up
11164 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
11166 TEMPLATE_HEADER_P is true when this declaration is preceded by
11167 a set of template parameters. */
11170 xref_tag (enum tag_types tag_code, tree name,
11171 tag_scope scope, bool template_header_p)
11173 enum tree_code code;
11175 tree context = NULL_TREE;
11177 timevar_push (TV_NAME_LOOKUP);
11179 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11185 code = RECORD_TYPE;
11191 code = ENUMERAL_TYPE;
11194 gcc_unreachable ();
11197 /* In case of anonymous name, xref_tag is only called to
11198 make type node and push name. Name lookup is not required. */
11199 if (ANON_AGGRNAME_P (name))
11202 t = lookup_and_check_tag (tag_code, name,
11203 scope, template_header_p);
11205 if (t == error_mark_node)
11206 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
11208 if (scope != ts_current && t && current_class_type
11209 && template_class_depth (current_class_type)
11210 && template_header_p)
11212 /* Since SCOPE is not TS_CURRENT, we are not looking at a
11213 definition of this tag. Since, in addition, we are currently
11214 processing a (member) template declaration of a template
11215 class, we must be very careful; consider:
11222 { template <class V>
11223 friend struct S1; };
11225 Here, the S2::S1 declaration should not be confused with the
11226 outer declaration. In particular, the inner version should
11227 have a template parameter of level 2, not level 1. This
11228 would be particularly important if the member declaration
11231 template <class V = U> friend struct S1;
11233 say, when we should tsubst into `U' when instantiating
11234 S2. On the other hand, when presented with:
11244 we must find the inner binding eventually. We
11245 accomplish this by making sure that the new type we
11246 create to represent this declaration has the right
11248 context = TYPE_CONTEXT (t);
11254 /* If no such tag is yet defined, create a forward-reference node
11255 and record it as the "definition".
11256 When a real declaration of this type is found,
11257 the forward-reference will be altered into a real type. */
11258 if (code == ENUMERAL_TYPE)
11260 error ("use of enum %q#D without previous declaration", name);
11261 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
11265 t = make_class_type (code);
11266 TYPE_CONTEXT (t) = context;
11267 t = pushtag (name, t, scope);
11272 if (template_header_p && MAYBE_CLASS_TYPE_P (t))
11274 if (!redeclare_class_template (t, current_template_parms))
11275 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
11277 else if (!processing_template_decl
11278 && CLASS_TYPE_P (t)
11279 && CLASSTYPE_IS_TEMPLATE (t))
11281 error ("redeclaration of %qT as a non-template", t);
11282 error ("previous declaration %q+D", t);
11283 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
11286 /* Make injected friend class visible. */
11287 if (scope != ts_within_enclosing_non_class
11288 && hidden_name_p (TYPE_NAME (t)))
11290 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
11291 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
11293 if (TYPE_TEMPLATE_INFO (t))
11295 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
11296 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
11301 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t);
11305 xref_tag_from_type (tree old, tree id, tag_scope scope)
11307 enum tag_types tag_kind;
11309 if (TREE_CODE (old) == RECORD_TYPE)
11310 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
11312 tag_kind = union_type;
11314 if (id == NULL_TREE)
11315 id = TYPE_IDENTIFIER (old);
11317 return xref_tag (tag_kind, id, scope, false);
11320 /* Create the binfo hierarchy for REF with (possibly NULL) base list
11321 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
11322 access_* node, and the TREE_VALUE is the type of the base-class.
11323 Non-NULL TREE_TYPE indicates virtual inheritance.
11325 Returns true if the binfo hierarchy was successfully created,
11326 false if an error was detected. */
11329 xref_basetypes (tree ref, tree base_list)
11332 tree binfo, base_binfo;
11333 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
11334 unsigned max_bases = 0; /* Maximum direct bases. */
11336 tree default_access;
11337 tree igo_prev; /* Track Inheritance Graph Order. */
11339 if (ref == error_mark_node)
11342 /* The base of a derived class is private by default, all others are
11344 default_access = (TREE_CODE (ref) == RECORD_TYPE
11345 && CLASSTYPE_DECLARED_CLASS (ref)
11346 ? access_private_node : access_public_node);
11348 /* First, make sure that any templates in base-classes are
11349 instantiated. This ensures that if we call ourselves recursively
11350 we do not get confused about which classes are marked and which
11352 basep = &base_list;
11355 tree basetype = TREE_VALUE (*basep);
11357 if (!(processing_template_decl && uses_template_parms (basetype))
11358 && !complete_type_or_else (basetype, NULL))
11359 /* An incomplete type. Remove it from the list. */
11360 *basep = TREE_CHAIN (*basep);
11364 if (TREE_TYPE (*basep))
11366 if (CLASS_TYPE_P (basetype))
11367 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
11368 basep = &TREE_CHAIN (*basep);
11372 TYPE_MARKED_P (ref) = 1;
11374 /* The binfo slot should be empty, unless this is an (ill-formed)
11376 if (TYPE_BINFO (ref) && !TYPE_SIZE (ref))
11378 error ("redefinition of %q#T", ref);
11382 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
11384 binfo = make_tree_binfo (max_bases);
11386 TYPE_BINFO (ref) = binfo;
11387 BINFO_OFFSET (binfo) = size_zero_node;
11388 BINFO_TYPE (binfo) = ref;
11390 /* Apply base-class info set up to the variants of this type. */
11391 fixup_type_variants (ref);
11395 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
11396 /* An aggregate cannot have baseclasses. */
11397 CLASSTYPE_NON_AGGREGATE (ref) = 1;
11399 if (TREE_CODE (ref) == UNION_TYPE)
11401 error ("derived union %qT invalid", ref);
11408 if (TYPE_FOR_JAVA (ref))
11410 error ("Java class %qT cannot have multiple bases", ref);
11417 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
11419 if (TYPE_FOR_JAVA (ref))
11421 error ("Java class %qT cannot have virtual bases", ref);
11426 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
11428 tree access = TREE_PURPOSE (base_list);
11429 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
11430 tree basetype = TREE_VALUE (base_list);
11432 if (access == access_default_node)
11433 access = default_access;
11435 if (PACK_EXPANSION_P (basetype))
11436 basetype = PACK_EXPANSION_PATTERN (basetype);
11437 if (TREE_CODE (basetype) == TYPE_DECL)
11438 basetype = TREE_TYPE (basetype);
11439 if (!MAYBE_CLASS_TYPE_P (basetype) || TREE_CODE (basetype) == UNION_TYPE)
11441 error ("base type %qT fails to be a struct or class type",
11446 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
11447 TYPE_FOR_JAVA (ref) = 1;
11449 base_binfo = NULL_TREE;
11450 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
11452 base_binfo = TYPE_BINFO (basetype);
11453 /* The original basetype could have been a typedef'd type. */
11454 basetype = BINFO_TYPE (base_binfo);
11456 /* Inherit flags from the base. */
11457 TYPE_HAS_NEW_OPERATOR (ref)
11458 |= TYPE_HAS_NEW_OPERATOR (basetype);
11459 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
11460 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
11461 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
11462 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
11463 CLASSTYPE_DIAMOND_SHAPED_P (ref)
11464 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
11465 CLASSTYPE_REPEATED_BASE_P (ref)
11466 |= CLASSTYPE_REPEATED_BASE_P (basetype);
11469 /* We must do this test after we've seen through a typedef
11471 if (TYPE_MARKED_P (basetype))
11473 if (basetype == ref)
11474 error ("recursive type %qT undefined", basetype);
11476 error ("duplicate base type %qT invalid", basetype);
11480 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
11481 /* Regenerate the pack expansion for the bases. */
11482 basetype = make_pack_expansion (basetype);
11484 TYPE_MARKED_P (basetype) = 1;
11486 base_binfo = copy_binfo (base_binfo, basetype, ref,
11487 &igo_prev, via_virtual);
11488 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
11489 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
11491 BINFO_BASE_APPEND (binfo, base_binfo);
11492 BINFO_BASE_ACCESS_APPEND (binfo, access);
11495 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
11496 /* If we have space in the vbase vector, we must have shared at
11497 least one of them, and are therefore diamond shaped. */
11498 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
11500 /* Unmark all the types. */
11501 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
11502 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11503 TYPE_MARKED_P (ref) = 0;
11505 /* Now see if we have a repeated base type. */
11506 if (!CLASSTYPE_REPEATED_BASE_P (ref))
11508 for (base_binfo = binfo; base_binfo;
11509 base_binfo = TREE_CHAIN (base_binfo))
11511 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11513 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
11516 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
11518 for (base_binfo = binfo; base_binfo;
11519 base_binfo = TREE_CHAIN (base_binfo))
11520 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11521 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11530 /* Copies the enum-related properties from type SRC to type DST.
11531 Used with the underlying type of an enum and the enum itself. */
11533 copy_type_enum (tree dst, tree src)
11535 TYPE_MIN_VALUE (dst) = TYPE_MIN_VALUE (src);
11536 TYPE_MAX_VALUE (dst) = TYPE_MAX_VALUE (src);
11537 TYPE_SIZE (dst) = TYPE_SIZE (src);
11538 TYPE_SIZE_UNIT (dst) = TYPE_SIZE_UNIT (src);
11539 SET_TYPE_MODE (dst, TYPE_MODE (src));
11540 TYPE_PRECISION (dst) = TYPE_PRECISION (src);
11541 TYPE_ALIGN (dst) = TYPE_ALIGN (src);
11542 TYPE_USER_ALIGN (dst) = TYPE_USER_ALIGN (src);
11543 TYPE_UNSIGNED (dst) = TYPE_UNSIGNED (src);
11546 /* Begin compiling the definition of an enumeration type.
11549 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
11551 UNDERLYING_TYPE is the type that will be used as the storage for
11552 the enumeration type. This should be NULL_TREE if no storage type
11555 SCOPED_ENUM_P is true if this is a scoped enumeration type.
11557 if IS_NEW is not NULL, gets TRUE iff a new type is created.
11559 Returns the type object, as yet incomplete.
11560 Also records info about it so that build_enumerator
11561 may be used to declare the individual values as they are read. */
11564 start_enum (tree name, tree enumtype, tree underlying_type,
11565 bool scoped_enum_p, bool *is_new)
11567 tree prevtype = NULL_TREE;
11568 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11572 /* [C++0x dcl.enum]p5:
11574 If not explicitly specified, the underlying type of a scoped
11575 enumeration type is int. */
11576 if (!underlying_type && scoped_enum_p)
11577 underlying_type = integer_type_node;
11579 if (underlying_type)
11580 underlying_type = cv_unqualified (underlying_type);
11582 /* If this is the real definition for a previous forward reference,
11583 fill in the contents in the same object that used to be the
11584 forward reference. */
11586 enumtype = lookup_and_check_tag (enum_type, name,
11587 /*tag_scope=*/ts_current,
11588 /*template_header_p=*/false);
11590 /* In case of a template_decl, the only check that should be deferred
11591 to instantiation time is the comparison of underlying types. */
11592 if (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE)
11594 if (scoped_enum_p != SCOPED_ENUM_P (enumtype))
11596 error_at (input_location, "scoped/unscoped mismatch "
11597 "in enum %q#T", enumtype);
11598 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11599 "previous definition here");
11600 enumtype = error_mark_node;
11602 else if (ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) != !! underlying_type)
11604 error_at (input_location, "underlying type mismatch "
11605 "in enum %q#T", enumtype);
11606 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11607 "previous definition here");
11608 enumtype = error_mark_node;
11610 else if (underlying_type && ENUM_UNDERLYING_TYPE (enumtype)
11611 && !dependent_type_p (underlying_type)
11612 && !dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype))
11613 && !same_type_p (underlying_type,
11614 ENUM_UNDERLYING_TYPE (enumtype)))
11616 error_at (input_location, "different underlying type "
11617 "in enum %q#T", enumtype);
11618 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11619 "previous definition here");
11620 underlying_type = NULL_TREE;
11624 if (!enumtype || TREE_CODE (enumtype) != ENUMERAL_TYPE
11625 || processing_template_decl)
11627 /* In case of error, make a dummy enum to allow parsing to
11629 if (enumtype == error_mark_node)
11631 name = make_anon_name ();
11632 enumtype = NULL_TREE;
11635 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
11636 of an opaque enum, or an opaque enum of an already defined
11637 enumeration (C++0x only).
11638 In any other case, it'll be NULL_TREE. */
11644 prevtype = enumtype;
11645 enumtype = cxx_make_type (ENUMERAL_TYPE);
11646 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
11647 if (enumtype == error_mark_node)
11648 return error_mark_node;
11650 /* The enum is considered opaque until the opening '{' of the
11651 enumerator list. */
11652 SET_OPAQUE_ENUM_P (enumtype, true);
11653 ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) = !! underlying_type;
11656 SET_SCOPED_ENUM_P (enumtype, scoped_enum_p);
11658 if (underlying_type)
11660 if (CP_INTEGRAL_TYPE_P (underlying_type))
11662 copy_type_enum (enumtype, underlying_type);
11663 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
11665 else if (dependent_type_p (underlying_type))
11666 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
11668 error ("underlying type %<%T%> of %<%T%> must be an integral type",
11669 underlying_type, enumtype);
11672 /* If into a template class, the returned enum is always the first
11673 declaration (opaque or not) seen. This way all the references to
11674 this type will be to the same declaration. The following ones are used
11675 only to check for definition errors. */
11676 if (prevtype && processing_template_decl)
11682 /* After processing and defining all the values of an enumeration type,
11683 install their decls in the enumeration type.
11684 ENUMTYPE is the type object. */
11687 finish_enum_value_list (tree enumtype)
11690 tree underlying_type;
11693 tree minnode, maxnode;
11696 bool fixed_underlying_type_p
11697 = ENUM_UNDERLYING_TYPE (enumtype) != NULL_TREE;
11699 /* We built up the VALUES in reverse order. */
11700 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
11702 /* For an enum defined in a template, just set the type of the values;
11703 all further processing is postponed until the template is
11704 instantiated. We need to set the type so that tsubst of a CONST_DECL
11706 if (processing_template_decl)
11708 for (values = TYPE_VALUES (enumtype);
11710 values = TREE_CHAIN (values))
11711 TREE_TYPE (TREE_VALUE (values)) = enumtype;
11715 /* Determine the minimum and maximum values of the enumerators. */
11716 if (TYPE_VALUES (enumtype))
11718 minnode = maxnode = NULL_TREE;
11720 for (values = TYPE_VALUES (enumtype);
11722 values = TREE_CHAIN (values))
11724 decl = TREE_VALUE (values);
11726 /* [dcl.enum]: Following the closing brace of an enum-specifier,
11727 each enumerator has the type of its enumeration. Prior to the
11728 closing brace, the type of each enumerator is the type of its
11729 initializing value. */
11730 TREE_TYPE (decl) = enumtype;
11732 /* Update the minimum and maximum values, if appropriate. */
11733 value = DECL_INITIAL (decl);
11734 if (value == error_mark_node)
11735 value = integer_zero_node;
11736 /* Figure out what the minimum and maximum values of the
11737 enumerators are. */
11739 minnode = maxnode = value;
11740 else if (tree_int_cst_lt (maxnode, value))
11742 else if (tree_int_cst_lt (value, minnode))
11749 If the enumerator-list is empty, the underlying type is as if
11750 the enumeration had a single enumerator with value 0. */
11751 minnode = maxnode = integer_zero_node;
11753 if (!fixed_underlying_type_p)
11755 /* Compute the number of bits require to represent all values of the
11756 enumeration. We must do this before the type of MINNODE and
11757 MAXNODE are transformed, since tree_int_cst_min_precision relies
11758 on the TREE_TYPE of the value it is passed. */
11759 bool unsignedp = tree_int_cst_sgn (minnode) >= 0;
11760 int lowprec = tree_int_cst_min_precision (minnode, unsignedp);
11761 int highprec = tree_int_cst_min_precision (maxnode, unsignedp);
11762 int precision = MAX (lowprec, highprec);
11764 bool use_short_enum;
11766 /* Determine the underlying type of the enumeration.
11770 The underlying type of an enumeration is an integral type that
11771 can represent all the enumerator values defined in the
11772 enumeration. It is implementation-defined which integral type is
11773 used as the underlying type for an enumeration except that the
11774 underlying type shall not be larger than int unless the value of
11775 an enumerator cannot fit in an int or unsigned int.
11777 We use "int" or an "unsigned int" as the underlying type, even if
11778 a smaller integral type would work, unless the user has
11779 explicitly requested that we use the smallest possible type. The
11780 user can request that for all enumerations with a command line
11781 flag, or for just one enumeration with an attribute. */
11783 use_short_enum = flag_short_enums
11784 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
11786 for (itk = (use_short_enum ? itk_char : itk_int);
11790 underlying_type = integer_types[itk];
11791 if (underlying_type != NULL_TREE
11792 && TYPE_PRECISION (underlying_type) >= precision
11793 && TYPE_UNSIGNED (underlying_type) == unsignedp)
11796 if (itk == itk_none)
11800 IF no integral type can represent all the enumerator values, the
11801 enumeration is ill-formed. */
11802 error ("no integral type can represent all of the enumerator values "
11803 "for %qT", enumtype);
11804 precision = TYPE_PRECISION (long_long_integer_type_node);
11805 underlying_type = integer_types[itk_unsigned_long_long];
11810 The value of sizeof() applied to an enumeration type, an object
11811 of an enumeration type, or an enumerator, is the value of sizeof()
11812 applied to the underlying type. */
11813 copy_type_enum (enumtype, underlying_type);
11815 /* Compute the minimum and maximum values for the type.
11819 For an enumeration where emin is the smallest enumerator and emax
11820 is the largest, the values of the enumeration are the values of the
11821 underlying type in the range bmin to bmax, where bmin and bmax are,
11822 respectively, the smallest and largest values of the smallest bit-
11823 field that can store emin and emax. */
11825 /* The middle-end currently assumes that types with TYPE_PRECISION
11826 narrower than their underlying type are suitably zero or sign
11827 extended to fill their mode. Similarly, it assumes that the front
11828 end assures that a value of a particular type must be within
11829 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
11831 We used to set these fields based on bmin and bmax, but that led
11832 to invalid assumptions like optimizing away bounds checking. So
11833 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
11834 TYPE_MAX_VALUE to the values for the mode above and only restrict
11835 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
11836 ENUM_UNDERLYING_TYPE (enumtype)
11837 = build_distinct_type_copy (underlying_type);
11838 TYPE_PRECISION (ENUM_UNDERLYING_TYPE (enumtype)) = precision;
11839 set_min_and_max_values_for_integral_type
11840 (ENUM_UNDERLYING_TYPE (enumtype), precision, unsignedp);
11842 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
11843 if (flag_strict_enums)
11844 set_min_and_max_values_for_integral_type (enumtype, precision,
11848 underlying_type = ENUM_UNDERLYING_TYPE (enumtype);
11850 /* Convert each of the enumerators to the type of the underlying
11851 type of the enumeration. */
11852 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
11854 location_t saved_location;
11856 decl = TREE_VALUE (values);
11857 saved_location = input_location;
11858 input_location = DECL_SOURCE_LOCATION (decl);
11859 if (fixed_underlying_type_p)
11860 /* If the enumeration type has a fixed underlying type, we
11861 already checked all of the enumerator values. */
11862 value = DECL_INITIAL (decl);
11864 value = perform_implicit_conversion (underlying_type,
11865 DECL_INITIAL (decl),
11866 tf_warning_or_error);
11867 input_location = saved_location;
11869 /* Do not clobber shared ints. */
11870 value = copy_node (value);
11872 TREE_TYPE (value) = enumtype;
11873 DECL_INITIAL (decl) = value;
11876 /* Fix up all variant types of this enum type. */
11877 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
11878 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
11880 /* Finish debugging output for this type. */
11881 rest_of_type_compilation (enumtype, namespace_bindings_p ());
11884 /* Finishes the enum type. This is called only the first time an
11885 enumeration is seen, be it opaque or odinary.
11886 ENUMTYPE is the type object. */
11889 finish_enum (tree enumtype)
11891 if (processing_template_decl)
11893 if (at_function_scope_p ())
11894 add_stmt (build_min (TAG_DEFN, enumtype));
11898 /* Here there should not be any variants of this type. */
11899 gcc_assert (enumtype == TYPE_MAIN_VARIANT (enumtype)
11900 && !TYPE_NEXT_VARIANT (enumtype));
11903 /* Build and install a CONST_DECL for an enumeration constant of the
11904 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
11905 LOC is the location of NAME.
11906 Assignment of sequential values by default is handled here. */
11909 build_enumerator (tree name, tree value, tree enumtype, location_t loc)
11915 /* If the VALUE was erroneous, pretend it wasn't there; that will
11916 result in the enum being assigned the next value in sequence. */
11917 if (value == error_mark_node)
11920 /* Remove no-op casts from the value. */
11922 STRIP_TYPE_NOPS (value);
11924 if (! processing_template_decl)
11926 /* Validate and default VALUE. */
11927 if (value != NULL_TREE)
11929 value = cxx_constant_value (value);
11931 if (TREE_CODE (value) == INTEGER_CST
11932 && INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (value)))
11934 value = perform_integral_promotions (value);
11938 error ("enumerator value for %qD is not an integer constant", name);
11943 /* Default based on previous value. */
11944 if (value == NULL_TREE)
11946 if (TYPE_VALUES (enumtype))
11949 unsigned HOST_WIDE_INT lo;
11953 /* The next value is the previous value plus one.
11954 add_double doesn't know the type of the target expression,
11955 so we must check with int_fits_type_p as well. */
11956 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
11957 if (error_operand_p (prev_value))
11958 value = error_mark_node;
11961 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
11962 TREE_INT_CST_HIGH (prev_value),
11964 value = build_int_cst_wide (TREE_TYPE (prev_value), lo, hi);
11966 |= !int_fits_type_p (value, TREE_TYPE (prev_value));
11970 error ("overflow in enumeration values at %qD", name);
11971 value = error_mark_node;
11976 value = integer_zero_node;
11979 /* Remove no-op casts from the value. */
11980 STRIP_TYPE_NOPS (value);
11982 /* If the underlying type of the enum is fixed, check whether
11983 the enumerator values fits in the underlying type. If it
11984 does not fit, the program is ill-formed [C++0x dcl.enum]. */
11985 if (ENUM_UNDERLYING_TYPE (enumtype)
11987 && TREE_CODE (value) == INTEGER_CST
11988 && !int_fits_type_p (value, ENUM_UNDERLYING_TYPE (enumtype)))
11990 error ("enumerator value %E is too large for underlying type %<%T%>",
11991 value, ENUM_UNDERLYING_TYPE (enumtype));
11993 /* Silently convert the value so that we can continue. */
11994 value = perform_implicit_conversion (ENUM_UNDERLYING_TYPE (enumtype),
11999 /* C++ associates enums with global, function, or class declarations. */
12000 context = current_scope ();
12002 /* Build the actual enumeration constant. Note that the enumeration
12003 constants have the underlying type of the enum (if it is fixed)
12004 or the type of their initializer (if the underlying type of the
12005 enum is not fixed):
12009 If the underlying type is fixed, the type of each enumerator
12010 prior to the closing brace is the underlying type; if the
12011 initializing value of an enumerator cannot be represented by
12012 the underlying type, the program is ill-formed. If the
12013 underlying type is not fixed, the type of each enumerator is
12014 the type of its initializing value.
12016 If the underlying type is not fixed, it will be computed by
12017 finish_enum and we will reset the type of this enumerator. Of
12018 course, if we're processing a template, there may be no value. */
12019 type = value ? TREE_TYPE (value) : NULL_TREE;
12021 if (context && context == current_class_type)
12022 /* This enum declaration is local to the class. We need the full
12023 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
12024 decl = build_lang_decl_loc (loc, CONST_DECL, name, type);
12026 /* It's a global enum, or it's local to a function. (Note local to
12027 a function could mean local to a class method. */
12028 decl = build_decl (loc, CONST_DECL, name, type);
12030 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
12031 TREE_CONSTANT (decl) = 1;
12032 TREE_READONLY (decl) = 1;
12033 DECL_INITIAL (decl) = value;
12035 if (context && context == current_class_type && !SCOPED_ENUM_P (enumtype))
12036 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
12037 on the TYPE_FIELDS list for `S'. (That's so that you can say
12038 things like `S::i' later.) */
12039 finish_member_declaration (decl);
12043 /* Add this enumeration constant to the list for this type. */
12044 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
12047 /* Look for an enumerator with the given NAME within the enumeration
12048 type ENUMTYPE. This routine is used primarily for qualified name
12049 lookup into an enumerator in C++0x, e.g.,
12051 enum class Color { Red, Green, Blue };
12053 Color color = Color::Red;
12055 Returns the value corresponding to the enumerator, or
12056 NULL_TREE if no such enumerator was found. */
12058 lookup_enumerator (tree enumtype, tree name)
12061 gcc_assert (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE);
12063 e = purpose_member (name, TYPE_VALUES (enumtype));
12064 return e? TREE_VALUE (e) : NULL_TREE;
12068 /* We're defining DECL. Make sure that its type is OK. */
12071 check_function_type (tree decl, tree current_function_parms)
12073 tree fntype = TREE_TYPE (decl);
12074 tree return_type = complete_type (TREE_TYPE (fntype));
12076 /* In a function definition, arg types must be complete. */
12077 require_complete_types_for_parms (current_function_parms);
12079 if (dependent_type_p (return_type))
12081 if (!COMPLETE_OR_VOID_TYPE_P (return_type)
12082 || (TYPE_FOR_JAVA (return_type) && MAYBE_CLASS_TYPE_P (return_type)))
12084 tree args = TYPE_ARG_TYPES (fntype);
12086 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
12087 error ("return type %q#T is incomplete", return_type);
12089 error ("return type has Java class type %q#T", return_type);
12091 /* Make it return void instead. */
12092 if (TREE_CODE (fntype) == METHOD_TYPE)
12093 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
12095 TREE_CHAIN (args));
12097 fntype = build_function_type (void_type_node, args);
12099 = build_exception_variant (fntype,
12100 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
12101 fntype = (cp_build_type_attribute_variant
12102 (fntype, TYPE_ATTRIBUTES (TREE_TYPE (decl))));
12103 TREE_TYPE (decl) = fntype;
12106 abstract_virtuals_error (decl, TREE_TYPE (fntype));
12109 /* Create the FUNCTION_DECL for a function definition.
12110 DECLSPECS and DECLARATOR are the parts of the declaration;
12111 they describe the function's name and the type it returns,
12112 but twisted together in a fashion that parallels the syntax of C.
12114 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
12115 DECLARATOR is really the DECL for the function we are about to
12116 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
12117 indicating that the function is an inline defined in-class.
12119 This function creates a binding context for the function body
12120 as well as setting up the FUNCTION_DECL in current_function_decl.
12122 For C++, we must first check whether that datum makes any sense.
12123 For example, "class A local_a(1,2);" means that variable local_a
12124 is an aggregate of type A, which should have a constructor
12125 applied to it with the argument list [1, 2].
12127 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
12128 or may be a BLOCK if the function has been defined previously
12129 in this translation unit. On exit, DECL_INITIAL (decl1) will be
12130 error_mark_node if the function has never been defined, or
12131 a BLOCK if the function has been defined somewhere. */
12134 start_preparsed_function (tree decl1, tree attrs, int flags)
12136 tree ctype = NULL_TREE;
12139 int doing_friend = 0;
12140 struct cp_binding_level *bl;
12141 tree current_function_parms;
12142 struct c_fileinfo *finfo
12143 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
12144 bool honor_interface;
12146 /* Sanity check. */
12147 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
12148 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
12150 fntype = TREE_TYPE (decl1);
12151 if (TREE_CODE (fntype) == METHOD_TYPE)
12152 ctype = TYPE_METHOD_BASETYPE (fntype);
12154 /* ISO C++ 11.4/5. A friend function defined in a class is in
12155 the (lexical) scope of the class in which it is defined. */
12156 if (!ctype && DECL_FRIEND_P (decl1))
12158 ctype = DECL_FRIEND_CONTEXT (decl1);
12160 /* CTYPE could be null here if we're dealing with a template;
12161 for example, `inline friend float foo()' inside a template
12162 will have no CTYPE set. */
12163 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
12169 if (DECL_DECLARED_INLINE_P (decl1)
12170 && lookup_attribute ("noinline", attrs))
12171 warning (0, "inline function %q+D given attribute noinline", decl1);
12173 /* Handle gnu_inline attribute. */
12174 if (GNU_INLINE_P (decl1))
12176 DECL_EXTERNAL (decl1) = 1;
12177 DECL_NOT_REALLY_EXTERN (decl1) = 0;
12178 DECL_INTERFACE_KNOWN (decl1) = 1;
12179 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
12182 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
12183 /* This is a constructor, we must ensure that any default args
12184 introduced by this definition are propagated to the clones
12185 now. The clones are used directly in overload resolution. */
12186 adjust_clone_args (decl1);
12188 /* Sometimes we don't notice that a function is a static member, and
12189 build a METHOD_TYPE for it. Fix that up now. */
12190 if (ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
12191 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE)
12193 revert_static_member_fn (decl1);
12197 /* Set up current_class_type, and enter the scope of the class, if
12200 push_nested_class (ctype);
12201 else if (DECL_STATIC_FUNCTION_P (decl1))
12202 push_nested_class (DECL_CONTEXT (decl1));
12204 /* Now that we have entered the scope of the class, we must restore
12205 the bindings for any template parameters surrounding DECL1, if it
12206 is an inline member template. (Order is important; consider the
12207 case where a template parameter has the same name as a field of
12208 the class.) It is not until after this point that
12209 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
12210 if (flags & SF_INCLASS_INLINE)
12211 maybe_begin_member_template_processing (decl1);
12213 /* Effective C++ rule 15. */
12215 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
12216 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
12217 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
12219 /* Make the init_value nonzero so pushdecl knows this is not tentative.
12220 error_mark_node is replaced below (in poplevel) with the BLOCK. */
12221 if (!DECL_INITIAL (decl1))
12222 DECL_INITIAL (decl1) = error_mark_node;
12224 /* This function exists in static storage.
12225 (This does not mean `static' in the C sense!) */
12226 TREE_STATIC (decl1) = 1;
12228 /* We must call push_template_decl after current_class_type is set
12229 up. (If we are processing inline definitions after exiting a
12230 class scope, current_class_type will be NULL_TREE until set above
12231 by push_nested_class.) */
12232 if (processing_template_decl)
12234 /* FIXME: Handle error_mark_node more gracefully. */
12235 tree newdecl1 = push_template_decl (decl1);
12236 if (newdecl1 != error_mark_node)
12240 /* We are now in the scope of the function being defined. */
12241 current_function_decl = decl1;
12243 /* Save the parm names or decls from this function's declarator
12244 where store_parm_decls will find them. */
12245 current_function_parms = DECL_ARGUMENTS (decl1);
12247 /* Make sure the parameter and return types are reasonable. When
12248 you declare a function, these types can be incomplete, but they
12249 must be complete when you define the function. */
12250 check_function_type (decl1, current_function_parms);
12252 /* Build the return declaration for the function. */
12253 restype = TREE_TYPE (fntype);
12254 if (DECL_RESULT (decl1) == NULL_TREE)
12258 resdecl = build_decl (input_location, RESULT_DECL, 0, restype);
12259 DECL_ARTIFICIAL (resdecl) = 1;
12260 DECL_IGNORED_P (resdecl) = 1;
12261 DECL_RESULT (decl1) = resdecl;
12263 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
12266 /* Let the user know we're compiling this function. */
12267 announce_function (decl1);
12269 /* Record the decl so that the function name is defined.
12270 If we already have a decl for this name, and it is a FUNCTION_DECL,
12271 use the old decl. */
12272 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
12274 /* A specialization is not used to guide overload resolution. */
12275 if (!DECL_FUNCTION_MEMBER_P (decl1)
12276 && !(DECL_USE_TEMPLATE (decl1) &&
12277 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
12279 tree olddecl = pushdecl (decl1);
12281 if (olddecl == error_mark_node)
12282 /* If something went wrong when registering the declaration,
12283 use DECL1; we have to have a FUNCTION_DECL to use when
12284 parsing the body of the function. */
12288 /* Otherwise, OLDDECL is either a previous declaration
12289 of the same function or DECL1 itself. */
12291 if (warn_missing_declarations
12292 && olddecl == decl1
12293 && !DECL_MAIN_P (decl1)
12294 && TREE_PUBLIC (decl1)
12295 && !DECL_DECLARED_INLINE_P (decl1))
12299 /* Check whether DECL1 is in an anonymous
12301 for (context = DECL_CONTEXT (decl1);
12303 context = DECL_CONTEXT (context))
12305 if (TREE_CODE (context) == NAMESPACE_DECL
12306 && DECL_NAME (context) == NULL_TREE)
12310 if (context == NULL)
12311 warning (OPT_Wmissing_declarations,
12312 "no previous declaration for %q+D", decl1);
12320 /* We need to set the DECL_CONTEXT. */
12321 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
12322 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
12324 fntype = TREE_TYPE (decl1);
12326 /* If #pragma weak applies, mark the decl appropriately now.
12327 The pragma only applies to global functions. Because
12328 determining whether or not the #pragma applies involves
12329 computing the mangled name for the declaration, we cannot
12330 apply the pragma until after we have merged this declaration
12331 with any previous declarations; if the original declaration
12332 has a linkage specification, that specification applies to
12333 the definition as well, and may affect the mangled name. */
12334 if (DECL_FILE_SCOPE_P (decl1))
12335 maybe_apply_pragma_weak (decl1);
12338 /* constexpr functions must have literal argument types and
12339 literal return type. */
12340 validate_constexpr_fundecl (decl1);
12342 /* Reset this in case the call to pushdecl changed it. */
12343 current_function_decl = decl1;
12345 gcc_assert (DECL_INITIAL (decl1));
12347 /* This function may already have been parsed, in which case just
12348 return; our caller will skip over the body without parsing. */
12349 if (DECL_INITIAL (decl1) != error_mark_node)
12352 /* Initialize RTL machinery. We cannot do this until
12353 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
12354 even when processing a template; this is how we get
12355 CFUN set up, and our per-function variables initialized.
12356 FIXME factor out the non-RTL stuff. */
12357 bl = current_binding_level;
12358 allocate_struct_function (decl1, processing_template_decl);
12360 /* Initialize the language data structures. Whenever we start
12361 a new function, we destroy temporaries in the usual way. */
12362 cfun->language = ggc_alloc_cleared_language_function ();
12363 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
12364 current_binding_level = bl;
12366 /* Even though we're inside a function body, we still don't want to
12367 call expand_expr to calculate the size of a variable-sized array.
12368 We haven't necessarily assigned RTL to all variables yet, so it's
12369 not safe to try to expand expressions involving them. */
12370 cfun->dont_save_pending_sizes_p = 1;
12372 /* Start the statement-tree, start the tree now. */
12373 DECL_SAVED_TREE (decl1) = push_stmt_list ();
12375 /* If we are (erroneously) defining a function that we have already
12376 defined before, wipe out what we knew before. */
12377 if (!DECL_PENDING_INLINE_P (decl1))
12378 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
12380 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
12382 /* We know that this was set up by `grokclassfn'. We do not
12383 wait until `store_parm_decls', since evil parse errors may
12384 never get us to that point. Here we keep the consistency
12385 between `current_class_type' and `current_class_ptr'. */
12386 tree t = DECL_ARGUMENTS (decl1);
12388 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
12389 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
12391 cp_function_chain->x_current_class_ref
12392 = cp_build_indirect_ref (t, RO_NULL, tf_warning_or_error);
12393 cp_function_chain->x_current_class_ptr = t;
12395 /* Constructors and destructors need to know whether they're "in
12396 charge" of initializing virtual base classes. */
12397 t = DECL_CHAIN (t);
12398 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
12400 current_in_charge_parm = t;
12401 t = DECL_CHAIN (t);
12403 if (DECL_HAS_VTT_PARM_P (decl1))
12405 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
12406 current_vtt_parm = t;
12410 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
12411 /* Implicitly-defined methods (like the
12412 destructor for a class in which no destructor
12413 is explicitly declared) must not be defined
12414 until their definition is needed. So, we
12415 ignore interface specifications for
12416 compiler-generated functions. */
12417 && !DECL_ARTIFICIAL (decl1));
12419 if (DECL_INTERFACE_KNOWN (decl1))
12421 tree ctx = decl_function_context (decl1);
12423 if (DECL_NOT_REALLY_EXTERN (decl1))
12424 DECL_EXTERNAL (decl1) = 0;
12426 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
12427 && TREE_PUBLIC (ctx))
12428 /* This is a function in a local class in an extern inline
12430 comdat_linkage (decl1);
12432 /* If this function belongs to an interface, it is public.
12433 If it belongs to someone else's interface, it is also external.
12434 This only affects inlines and template instantiations. */
12435 else if (!finfo->interface_unknown && honor_interface)
12437 if (DECL_DECLARED_INLINE_P (decl1)
12438 || DECL_TEMPLATE_INSTANTIATION (decl1)
12439 || processing_template_decl)
12441 DECL_EXTERNAL (decl1)
12442 = (finfo->interface_only
12443 || (DECL_DECLARED_INLINE_P (decl1)
12444 && ! flag_implement_inlines
12445 && !DECL_VINDEX (decl1)));
12447 /* For WIN32 we also want to put these in linkonce sections. */
12448 maybe_make_one_only (decl1);
12451 DECL_EXTERNAL (decl1) = 0;
12452 DECL_INTERFACE_KNOWN (decl1) = 1;
12453 /* If this function is in an interface implemented in this file,
12454 make sure that the back end knows to emit this function
12456 if (!DECL_EXTERNAL (decl1))
12457 mark_needed (decl1);
12459 else if (finfo->interface_unknown && finfo->interface_only
12460 && honor_interface)
12462 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
12463 interface, we will have both finfo->interface_unknown and
12464 finfo->interface_only set. In that case, we don't want to
12465 use the normal heuristics because someone will supply a
12466 #pragma implementation elsewhere, and deducing it here would
12467 produce a conflict. */
12468 comdat_linkage (decl1);
12469 DECL_EXTERNAL (decl1) = 0;
12470 DECL_INTERFACE_KNOWN (decl1) = 1;
12471 DECL_DEFER_OUTPUT (decl1) = 1;
12475 /* This is a definition, not a reference.
12476 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
12477 if (!GNU_INLINE_P (decl1))
12478 DECL_EXTERNAL (decl1) = 0;
12480 if ((DECL_DECLARED_INLINE_P (decl1)
12481 || DECL_TEMPLATE_INSTANTIATION (decl1))
12482 && ! DECL_INTERFACE_KNOWN (decl1))
12483 DECL_DEFER_OUTPUT (decl1) = 1;
12485 DECL_INTERFACE_KNOWN (decl1) = 1;
12488 /* Determine the ELF visibility attribute for the function. We must not
12489 do this before calling "pushdecl", as we must allow "duplicate_decls"
12490 to merge any attributes appropriately. We also need to wait until
12492 if (!DECL_CLONED_FUNCTION_P (decl1))
12493 determine_visibility (decl1);
12495 begin_scope (sk_function_parms, decl1);
12499 if (DECL_DESTRUCTOR_P (decl1)
12500 || (DECL_CONSTRUCTOR_P (decl1)
12501 && targetm.cxx.cdtor_returns_this ()))
12503 cdtor_label = build_decl (input_location,
12504 LABEL_DECL, NULL_TREE, NULL_TREE);
12505 DECL_CONTEXT (cdtor_label) = current_function_decl;
12508 start_fname_decls ();
12510 store_parm_decls (current_function_parms);
12514 /* Like start_preparsed_function, except that instead of a
12515 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
12517 Returns 1 on success. If the DECLARATOR is not suitable for a function
12518 (it defines a datum instead), we return 0, which tells
12519 yyparse to report a parse error. */
12522 start_function (cp_decl_specifier_seq *declspecs,
12523 const cp_declarator *declarator,
12528 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
12529 if (decl1 == error_mark_node)
12531 /* If the declarator is not suitable for a function definition,
12532 cause a syntax error. */
12533 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
12535 error ("invalid function declaration");
12539 if (DECL_MAIN_P (decl1))
12540 /* main must return int. grokfndecl should have corrected it
12541 (and issued a diagnostic) if the user got it wrong. */
12542 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
12543 integer_type_node));
12545 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
12550 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
12554 use_eh_spec_block (tree fn)
12556 return (flag_exceptions && flag_enforce_eh_specs
12557 && !processing_template_decl
12558 && !type_throw_all_p (TREE_TYPE (fn))
12559 /* We insert the EH_SPEC_BLOCK only in the original
12560 function; then, it is copied automatically to the
12562 && !DECL_CLONED_FUNCTION_P (fn)
12563 /* Implicitly-generated constructors and destructors have
12564 exception specifications. However, those specifications
12565 are the union of the possible exceptions specified by the
12566 constructors/destructors for bases and members, so no
12567 unallowed exception will ever reach this function. By
12568 not creating the EH_SPEC_BLOCK we save a little memory,
12569 and we avoid spurious warnings about unreachable
12571 && !DECL_ARTIFICIAL (fn));
12574 /* Store the parameter declarations into the current function declaration.
12575 This is called after parsing the parameter declarations, before
12576 digesting the body of the function.
12578 Also install to binding contour return value identifier, if any. */
12581 store_parm_decls (tree current_function_parms)
12583 tree fndecl = current_function_decl;
12586 /* This is a chain of any other decls that came in among the parm
12587 declarations. If a parm is declared with enum {foo, bar} x;
12588 then CONST_DECLs for foo and bar are put here. */
12589 tree nonparms = NULL_TREE;
12591 if (current_function_parms)
12593 /* This case is when the function was defined with an ANSI prototype.
12594 The parms already have decls, so we need not do anything here
12595 except record them as in effect
12596 and complain if any redundant old-style parm decls were written. */
12598 tree specparms = current_function_parms;
12601 /* Must clear this because it might contain TYPE_DECLs declared
12603 current_binding_level->names = NULL;
12605 /* If we're doing semantic analysis, then we'll call pushdecl
12606 for each of these. We must do them in reverse order so that
12607 they end in the correct forward order. */
12608 specparms = nreverse (specparms);
12610 for (parm = specparms; parm; parm = next)
12612 next = DECL_CHAIN (parm);
12613 if (TREE_CODE (parm) == PARM_DECL)
12615 if (DECL_NAME (parm) == NULL_TREE
12616 || TREE_CODE (parm) != VOID_TYPE)
12619 error ("parameter %qD declared void", parm);
12623 /* If we find an enum constant or a type tag,
12624 put it aside for the moment. */
12625 TREE_CHAIN (parm) = NULL_TREE;
12626 nonparms = chainon (nonparms, parm);
12630 /* Get the decls in their original chain order and record in the
12631 function. This is all and only the PARM_DECLs that were
12632 pushed into scope by the loop above. */
12633 DECL_ARGUMENTS (fndecl) = getdecls ();
12636 DECL_ARGUMENTS (fndecl) = NULL_TREE;
12638 /* Now store the final chain of decls for the arguments
12639 as the decl-chain of the current lexical scope.
12640 Put the enumerators in as well, at the front so that
12641 DECL_ARGUMENTS is not modified. */
12642 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
12644 if (use_eh_spec_block (current_function_decl))
12645 current_eh_spec_block = begin_eh_spec_block ();
12649 /* We have finished doing semantic analysis on DECL, but have not yet
12650 generated RTL for its body. Save away our current state, so that
12651 when we want to generate RTL later we know what to do. */
12654 save_function_data (tree decl)
12656 struct language_function *f;
12658 /* Save the language-specific per-function data so that we can
12659 get it back when we really expand this function. */
12660 gcc_assert (!DECL_PENDING_INLINE_P (decl));
12663 f = ggc_alloc_language_function ();
12664 memcpy (f, cp_function_chain, sizeof (struct language_function));
12665 DECL_SAVED_FUNCTION_DATA (decl) = f;
12667 /* Clear out the bits we don't need. */
12668 f->base.x_stmt_tree.x_cur_stmt_list = NULL_TREE;
12669 f->bindings = NULL;
12670 f->x_local_names = NULL;
12674 /* Set the return value of the constructor (if present). */
12677 finish_constructor_body (void)
12682 if (targetm.cxx.cdtor_returns_this ()
12683 && (! TYPE_FOR_JAVA (current_class_type)))
12685 /* Any return from a constructor will end up here. */
12686 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
12688 val = DECL_ARGUMENTS (current_function_decl);
12689 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
12690 DECL_RESULT (current_function_decl), val);
12691 /* Return the address of the object. */
12692 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
12693 add_stmt (exprstmt);
12697 /* Do all the processing for the beginning of a destructor; set up the
12698 vtable pointers and cleanups for bases and members. */
12701 begin_destructor_body (void)
12703 tree compound_stmt;
12705 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
12706 issued an error message. We still want to try to process the
12707 body of the function, but initialize_vtbl_ptrs will crash if
12708 TYPE_BINFO is NULL. */
12709 if (COMPLETE_TYPE_P (current_class_type))
12711 compound_stmt = begin_compound_stmt (0);
12712 /* Make all virtual function table pointers in non-virtual base
12713 classes point to CURRENT_CLASS_TYPE's virtual function
12715 initialize_vtbl_ptrs (current_class_ptr);
12716 finish_compound_stmt (compound_stmt);
12718 /* And insert cleanups for our bases and members so that they
12719 will be properly destroyed if we throw. */
12720 push_base_cleanups ();
12724 /* At the end of every destructor we generate code to delete the object if
12725 necessary. Do that now. */
12728 finish_destructor_body (void)
12732 /* Any return from a destructor will end up here; that way all base
12733 and member cleanups will be run when the function returns. */
12734 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
12736 /* In a virtual destructor, we must call delete. */
12737 if (DECL_VIRTUAL_P (current_function_decl))
12740 tree virtual_size = cxx_sizeof (current_class_type);
12744 At the point of definition of a virtual destructor (including
12745 an implicit definition), non-placement operator delete shall
12746 be looked up in the scope of the destructor's class and if
12747 found shall be accessible and unambiguous. */
12748 exprstmt = build_op_delete_call(DELETE_EXPR, current_class_ptr,
12750 /*global_p=*/false,
12751 /*placement=*/NULL_TREE,
12752 /*alloc_fn=*/NULL_TREE);
12754 if_stmt = begin_if_stmt ();
12755 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
12756 current_in_charge_parm,
12759 finish_expr_stmt (exprstmt);
12760 finish_then_clause (if_stmt);
12761 finish_if_stmt (if_stmt);
12764 if (targetm.cxx.cdtor_returns_this ())
12768 val = DECL_ARGUMENTS (current_function_decl);
12769 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
12770 DECL_RESULT (current_function_decl), val);
12771 /* Return the address of the object. */
12772 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
12773 add_stmt (exprstmt);
12777 /* Do the necessary processing for the beginning of a function body, which
12778 in this case includes member-initializers, but not the catch clauses of
12779 a function-try-block. Currently, this means opening a binding level
12780 for the member-initializers (in a ctor) and member cleanups (in a dtor). */
12783 begin_function_body (void)
12787 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
12790 if (processing_template_decl)
12791 /* Do nothing now. */;
12793 /* Always keep the BLOCK node associated with the outermost pair of
12794 curly braces of a function. These are needed for correct
12795 operation of dwarfout.c. */
12796 keep_next_level (true);
12798 stmt = begin_compound_stmt (BCS_FN_BODY);
12800 if (processing_template_decl)
12801 /* Do nothing now. */;
12802 else if (DECL_DESTRUCTOR_P (current_function_decl))
12803 begin_destructor_body ();
12808 /* Do the processing for the end of a function body. Currently, this means
12809 closing out the cleanups for fully-constructed bases and members, and in
12810 the case of the destructor, deleting the object if desired. Again, this
12811 is only meaningful for [cd]tors, since they are the only functions where
12812 there is a significant distinction between the main body and any
12813 function catch clauses. Handling, say, main() return semantics here
12814 would be wrong, as flowing off the end of a function catch clause for
12815 main() would also need to return 0. */
12818 finish_function_body (tree compstmt)
12820 if (compstmt == NULL_TREE)
12823 /* Close the block. */
12824 finish_compound_stmt (compstmt);
12826 if (processing_template_decl)
12827 /* Do nothing now. */;
12828 else if (DECL_CONSTRUCTOR_P (current_function_decl))
12829 finish_constructor_body ();
12830 else if (DECL_DESTRUCTOR_P (current_function_decl))
12831 finish_destructor_body ();
12834 /* Given a function, returns the BLOCK corresponding to the outermost level
12835 of curly braces, skipping the artificial block created for constructor
12839 outer_curly_brace_block (tree fndecl)
12841 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
12842 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
12843 /* Skip the artificial function body block. */
12844 block = BLOCK_SUBBLOCKS (block);
12848 /* If FNDECL is a class's key method, add the class to the list of
12849 keyed classes that should be emitted. */
12852 record_key_method_defined (tree fndecl)
12854 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
12855 && DECL_VIRTUAL_P (fndecl)
12856 && !processing_template_decl)
12858 tree fnclass = DECL_CONTEXT (fndecl);
12859 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
12860 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
12864 /* Subroutine of finish_function.
12865 Save the body of constexpr functions for possible
12866 future compile time evaluation. */
12869 maybe_save_function_definition (tree fun)
12871 if (!processing_template_decl
12872 && DECL_DECLARED_CONSTEXPR_P (fun)
12873 && !DECL_CLONED_FUNCTION_P (fun))
12874 register_constexpr_fundef (fun, DECL_SAVED_TREE (fun));
12877 /* Finish up a function declaration and compile that function
12878 all the way to assembler language output. The free the storage
12879 for the function definition.
12881 FLAGS is a bitwise or of the following values:
12883 We just finished processing the body of an in-class inline
12884 function definition. (This processing will have taken place
12885 after the class definition is complete.) */
12888 finish_function (int flags)
12890 tree fndecl = current_function_decl;
12891 tree fntype, ctype = NULL_TREE;
12892 int inclass_inline = (flags & 2) != 0;
12894 /* When we get some parse errors, we can end up without a
12895 current_function_decl, so cope. */
12896 if (fndecl == NULL_TREE)
12897 return error_mark_node;
12899 if (c_dialect_objc ())
12900 objc_finish_function ();
12902 gcc_assert (!defer_mark_used_calls);
12903 defer_mark_used_calls = true;
12905 record_key_method_defined (fndecl);
12907 fntype = TREE_TYPE (fndecl);
12909 /* TREE_READONLY (fndecl) = 1;
12910 This caused &foo to be of type ptr-to-const-function
12911 which then got a warning when stored in a ptr-to-function variable. */
12913 gcc_assert (building_stmt_tree ());
12914 /* The current function is being defined, so its DECL_INITIAL should
12915 be set, and unless there's a multiple definition, it should be
12916 error_mark_node. */
12917 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
12919 /* For a cloned function, we've already got all the code we need;
12920 there's no need to add any extra bits. */
12921 if (!DECL_CLONED_FUNCTION_P (fndecl))
12923 if (DECL_MAIN_P (current_function_decl))
12927 /* Make it so that `main' always returns 0 by default (or
12930 stmt = finish_return_stmt (integer_one_node);
12932 stmt = finish_return_stmt (integer_zero_node);
12934 /* Hack. We don't want the middle-end to warn that this
12935 return is unreachable, so put the statement on the
12938 location_t linezero = linemap_line_start (line_table, 0, 1);
12939 SET_EXPR_LOCATION (stmt, linezero);
12943 if (use_eh_spec_block (current_function_decl))
12944 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
12945 (TREE_TYPE (current_function_decl)),
12946 current_eh_spec_block);
12949 /* If we're saving up tree structure, tie off the function now. */
12950 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
12952 finish_fname_decls ();
12954 /* If this function can't throw any exceptions, remember that. */
12955 if (!processing_template_decl
12956 && !cp_function_chain->can_throw
12957 && !flag_non_call_exceptions
12958 && !decl_replaceable_p (fndecl))
12959 TREE_NOTHROW (fndecl) = 1;
12961 /* This must come after expand_function_end because cleanups might
12962 have declarations (from inline functions) that need to go into
12963 this function's blocks. */
12965 /* If the current binding level isn't the outermost binding level
12966 for this function, either there is a bug, or we have experienced
12967 syntax errors and the statement tree is malformed. */
12968 if (current_binding_level->kind != sk_function_parms)
12970 /* Make sure we have already experienced errors. */
12971 gcc_assert (errorcount);
12973 /* Throw away the broken statement tree and extra binding
12975 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
12977 while (current_binding_level->kind != sk_function_parms)
12979 if (current_binding_level->kind == sk_class)
12980 pop_nested_class ();
12982 poplevel (0, 0, 0);
12985 poplevel (1, 0, 1);
12987 /* Statements should always be full-expressions at the outermost set
12988 of curly braces for a function. */
12989 gcc_assert (stmts_are_full_exprs_p ());
12991 /* Save constexpr function body before it gets munged by
12992 the NRV transformation. */
12993 maybe_save_function_definition (fndecl);
12995 /* Set up the named return value optimization, if we can. Candidate
12996 variables are selected in check_return_expr. */
12997 if (current_function_return_value)
12999 tree r = current_function_return_value;
13002 if (r != error_mark_node
13003 /* This is only worth doing for fns that return in memory--and
13004 simpler, since we don't have to worry about promoted modes. */
13005 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
13006 /* Only allow this for variables declared in the outer scope of
13007 the function so we know that their lifetime always ends with a
13008 return; see g++.dg/opt/nrv6.C. We could be more flexible if
13009 we were to do this optimization in tree-ssa. */
13010 && (outer = outer_curly_brace_block (fndecl))
13011 && chain_member (r, BLOCK_VARS (outer)))
13012 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
13014 current_function_return_value = NULL_TREE;
13017 /* Remember that we were in class scope. */
13018 if (current_class_name)
13019 ctype = current_class_type;
13021 /* Must mark the RESULT_DECL as being in this function. */
13022 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
13024 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
13025 to the FUNCTION_DECL node itself. */
13026 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
13028 /* Save away current state, if appropriate. */
13029 if (!processing_template_decl)
13030 save_function_data (fndecl);
13032 /* Complain if there's just no return statement. */
13033 if (warn_return_type
13034 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
13035 && !dependent_type_p (TREE_TYPE (fntype))
13036 && !current_function_returns_value && !current_function_returns_null
13037 /* Don't complain if we abort or throw. */
13038 && !current_function_returns_abnormally
13039 /* Don't complain if we are declared noreturn. */
13040 && !TREE_THIS_VOLATILE (fndecl)
13041 && !DECL_NAME (DECL_RESULT (fndecl))
13042 && !TREE_NO_WARNING (fndecl)
13043 /* Structor return values (if any) are set by the compiler. */
13044 && !DECL_CONSTRUCTOR_P (fndecl)
13045 && !DECL_DESTRUCTOR_P (fndecl))
13047 warning (OPT_Wreturn_type,
13048 "no return statement in function returning non-void");
13049 TREE_NO_WARNING (fndecl) = 1;
13052 /* Store the end of the function, so that we get good line number
13053 info for the epilogue. */
13054 cfun->function_end_locus = input_location;
13056 /* Complain about parameters that are only set, but never otherwise used. */
13057 if (warn_unused_but_set_parameter
13058 && !processing_template_decl
13059 && errorcount == unused_but_set_errorcount
13060 && !DECL_CLONED_FUNCTION_P (fndecl))
13064 for (decl = DECL_ARGUMENTS (fndecl);
13066 decl = DECL_CHAIN (decl))
13067 if (TREE_USED (decl)
13068 && TREE_CODE (decl) == PARM_DECL
13069 && !DECL_READ_P (decl)
13070 && DECL_NAME (decl)
13071 && !DECL_ARTIFICIAL (decl)
13072 && !TREE_NO_WARNING (decl)
13073 && !DECL_IN_SYSTEM_HEADER (decl)
13074 && TREE_TYPE (decl) != error_mark_node
13075 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
13076 && (!CLASS_TYPE_P (TREE_TYPE (decl))
13077 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
13078 warning (OPT_Wunused_but_set_parameter,
13079 "parameter %q+D set but not used", decl);
13080 unused_but_set_errorcount = errorcount;
13083 /* Genericize before inlining. */
13084 if (!processing_template_decl)
13086 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
13087 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl);
13088 cp_genericize (fndecl);
13089 /* Clear out the bits we don't need. */
13090 f->x_current_class_ptr = NULL;
13091 f->x_current_class_ref = NULL;
13092 f->x_eh_spec_block = NULL;
13093 f->x_in_charge_parm = NULL;
13094 f->x_vtt_parm = NULL;
13095 f->x_return_value = NULL;
13096 f->bindings = NULL;
13097 f->extern_decl_map = NULL;
13099 /* Clear out the bits we don't need. */
13100 local_names = NULL;
13102 /* We're leaving the context of this function, so zap cfun. It's still in
13103 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
13105 current_function_decl = NULL;
13107 /* If this is an in-class inline definition, we may have to pop the
13108 bindings for the template parameters that we added in
13109 maybe_begin_member_template_processing when start_function was
13111 if (inclass_inline)
13112 maybe_end_member_template_processing ();
13114 /* Leave the scope of the class. */
13116 pop_nested_class ();
13121 current_function_decl = NULL_TREE;
13123 defer_mark_used_calls = false;
13124 if (deferred_mark_used_calls)
13129 FOR_EACH_VEC_ELT (tree, deferred_mark_used_calls, i, decl)
13131 VEC_free (tree, gc, deferred_mark_used_calls);
13137 /* Create the FUNCTION_DECL for a function definition.
13138 DECLSPECS and DECLARATOR are the parts of the declaration;
13139 they describe the return type and the name of the function,
13140 but twisted together in a fashion that parallels the syntax of C.
13142 This function creates a binding context for the function body
13143 as well as setting up the FUNCTION_DECL in current_function_decl.
13145 Returns a FUNCTION_DECL on success.
13147 If the DECLARATOR is not suitable for a function (it defines a datum
13148 instead), we return 0, which tells yyparse to report a parse error.
13150 May return void_type_node indicating that this method is actually
13151 a friend. See grokfield for more details.
13153 Came here with a `.pushlevel' .
13155 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
13156 CHANGES TO CODE IN `grokfield'. */
13159 grokmethod (cp_decl_specifier_seq *declspecs,
13160 const cp_declarator *declarator, tree attrlist)
13162 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
13165 if (fndecl == error_mark_node)
13166 return error_mark_node;
13168 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
13170 error ("invalid member function declaration");
13171 return error_mark_node;
13175 cplus_decl_attributes (&fndecl, attrlist, 0);
13177 /* Pass friends other than inline friend functions back. */
13178 if (fndecl == void_type_node)
13181 if (DECL_IN_AGGR_P (fndecl))
13183 if (DECL_CLASS_SCOPE_P (fndecl))
13184 error ("%qD is already defined in class %qT", fndecl,
13185 DECL_CONTEXT (fndecl));
13186 return error_mark_node;
13189 check_template_shadow (fndecl);
13191 DECL_DECLARED_INLINE_P (fndecl) = 1;
13192 DECL_NO_INLINE_WARNING_P (fndecl) = 1;
13194 /* We process method specializations in finish_struct_1. */
13195 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
13197 fndecl = push_template_decl (fndecl);
13198 if (fndecl == error_mark_node)
13202 if (! DECL_FRIEND_P (fndecl))
13204 if (DECL_CHAIN (fndecl))
13206 fndecl = copy_node (fndecl);
13207 TREE_CHAIN (fndecl) = NULL_TREE;
13211 cp_finish_decl (fndecl, NULL_TREE, false, NULL_TREE, 0);
13213 DECL_IN_AGGR_P (fndecl) = 1;
13218 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
13219 we can lay it out later, when and if its type becomes complete. */
13222 maybe_register_incomplete_var (tree var)
13224 gcc_assert (TREE_CODE (var) == VAR_DECL);
13226 /* Keep track of variables with incomplete types. */
13227 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
13228 && DECL_EXTERNAL (var))
13230 tree inner_type = TREE_TYPE (var);
13232 while (TREE_CODE (inner_type) == ARRAY_TYPE)
13233 inner_type = TREE_TYPE (inner_type);
13234 inner_type = TYPE_MAIN_VARIANT (inner_type);
13236 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
13237 /* RTTI TD entries are created while defining the type_info. */
13238 || (TYPE_LANG_SPECIFIC (inner_type)
13239 && TYPE_BEING_DEFINED (inner_type)))
13242 = VEC_safe_push (incomplete_var, gc, incomplete_vars, NULL);
13244 iv->incomplete_type = inner_type;
13249 /* Called when a class type (given by TYPE) is defined. If there are
13250 any existing VAR_DECLs whose type has been completed by this
13251 declaration, update them now. */
13254 complete_vars (tree type)
13257 incomplete_var *iv;
13259 for (ix = 0; VEC_iterate (incomplete_var, incomplete_vars, ix, iv); )
13261 if (same_type_p (type, iv->incomplete_type))
13263 tree var = iv->decl;
13264 tree type = TREE_TYPE (var);
13265 /* Complete the type of the variable. The VAR_DECL itself
13266 will be laid out in expand_expr. */
13267 complete_type (type);
13268 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
13269 /* Remove this entry from the list. */
13270 VEC_unordered_remove (incomplete_var, incomplete_vars, ix);
13276 /* Check for pending declarations which may have abstract type. */
13277 complete_type_check_abstract (type);
13280 /* If DECL is of a type which needs a cleanup, build and return an
13281 expression to perform that cleanup here. Return NULL_TREE if no
13282 cleanup need be done. */
13285 cxx_maybe_build_cleanup (tree decl)
13291 /* Assume no cleanup is required. */
13292 cleanup = NULL_TREE;
13294 if (error_operand_p (decl))
13297 /* Handle "__attribute__((cleanup))". We run the cleanup function
13298 before the destructor since the destructor is what actually
13299 terminates the lifetime of the object. */
13300 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
13307 /* Get the name specified by the user for the cleanup function. */
13308 id = TREE_VALUE (TREE_VALUE (attr));
13309 /* Look up the name to find the cleanup function to call. It is
13310 important to use lookup_name here because that is what is
13311 used in c-common.c:handle_cleanup_attribute when performing
13312 initial checks on the attribute. Note that those checks
13313 include ensuring that the function found is not an overloaded
13314 function, or an object with an overloaded call operator,
13315 etc.; we can rely on the fact that the function found is an
13316 ordinary FUNCTION_DECL. */
13317 fn = lookup_name (id);
13318 arg = build_address (decl);
13320 cleanup = cp_build_function_call_nary (fn, tf_warning_or_error,
13323 /* Handle ordinary C++ destructors. */
13324 type = TREE_TYPE (decl);
13325 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
13327 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
13328 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
13329 && CLASSTYPE_VBASECLASSES (type));
13333 if (TREE_CODE (type) == ARRAY_TYPE)
13336 addr = build_address (decl);
13338 /* Optimize for space over speed here. */
13339 if (!has_vbases || flag_expensive_optimizations)
13340 flags |= LOOKUP_NONVIRTUAL;
13342 call = build_delete (TREE_TYPE (addr), addr,
13343 sfk_complete_destructor, flags, 0);
13345 cleanup = build_compound_expr (input_location, cleanup, call);
13353 /* When a stmt has been parsed, this function is called. */
13360 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
13361 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
13362 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
13365 static_fn_type (tree memfntype)
13370 if (TYPE_PTRMEMFUNC_P (memfntype))
13371 memfntype = TYPE_PTRMEMFUNC_FN_TYPE (memfntype);
13372 if (POINTER_TYPE_P (memfntype)
13373 || TREE_CODE (memfntype) == FUNCTION_DECL)
13374 memfntype = TREE_TYPE (memfntype);
13375 if (TREE_CODE (memfntype) == FUNCTION_TYPE)
13377 gcc_assert (TREE_CODE (memfntype) == METHOD_TYPE);
13378 args = TYPE_ARG_TYPES (memfntype);
13379 fntype = build_function_type (TREE_TYPE (memfntype), TREE_CHAIN (args));
13380 fntype = apply_memfn_quals (fntype, type_memfn_quals (memfntype));
13381 fntype = (cp_build_type_attribute_variant
13382 (fntype, TYPE_ATTRIBUTES (memfntype)));
13383 fntype = (build_exception_variant
13384 (fntype, TYPE_RAISES_EXCEPTIONS (memfntype)));
13388 /* DECL was originally constructed as a non-static member function,
13389 but turned out to be static. Update it accordingly. */
13392 revert_static_member_fn (tree decl)
13394 tree stype = static_fn_type (decl);
13396 if (type_memfn_quals (stype) != TYPE_UNQUALIFIED)
13398 error ("static member function %q#D declared with type qualifiers", decl);
13399 stype = apply_memfn_quals (stype, TYPE_UNQUALIFIED);
13401 TREE_TYPE (decl) = stype;
13403 if (DECL_ARGUMENTS (decl))
13404 DECL_ARGUMENTS (decl) = DECL_CHAIN (DECL_ARGUMENTS (decl));
13405 DECL_STATIC_FUNCTION_P (decl) = 1;
13408 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
13409 one of the language-independent trees. */
13411 enum cp_tree_node_structure_enum
13412 cp_tree_node_structure (union lang_tree_node * t)
13414 switch (TREE_CODE (&t->generic))
13416 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
13417 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
13418 case OVERLOAD: return TS_CP_OVERLOAD;
13419 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
13420 case PTRMEM_CST: return TS_CP_PTRMEM;
13421 case BASELINK: return TS_CP_BASELINK;
13422 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
13423 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
13424 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
13425 case LAMBDA_EXPR: return TS_CP_LAMBDA_EXPR;
13426 case TEMPLATE_INFO: return TS_CP_TEMPLATE_INFO;
13427 default: return TS_CP_GENERIC;
13431 /* Build the void_list_node (void_type_node having been created). */
13433 build_void_list_node (void)
13435 tree t = build_tree_list (NULL_TREE, void_type_node);
13440 cp_missing_noreturn_ok_p (tree decl)
13442 /* A missing noreturn is ok for the `main' function. */
13443 return DECL_MAIN_P (decl);
13446 /* Return the COMDAT group into which DECL should be placed. */
13449 cxx_comdat_group (tree decl)
13453 /* Virtual tables, construction virtual tables, and virtual table
13454 tables all go in a single COMDAT group, named after the primary
13456 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
13457 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
13458 /* For all other DECLs, the COMDAT group is the mangled name of the
13459 declaration itself. */
13462 while (DECL_THUNK_P (decl))
13464 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
13465 into the same section as the target function. In that case
13466 we must return target's name. */
13467 tree target = THUNK_TARGET (decl);
13468 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
13469 && DECL_SECTION_NAME (target) != NULL
13470 && DECL_ONE_ONLY (target))
13475 name = DECL_ASSEMBLER_NAME (decl);
13481 #include "gt-cp-decl.h"