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
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(()) 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 = 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 = 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 (p2 == NULL_TREE && 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 (p1 == NULL_TREE
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);
1012 types_match = compparms (p1, p2);
1017 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1019 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl))
1020 != TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)))
1023 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1024 DECL_TEMPLATE_PARMS (olddecl)))
1027 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1028 types_match = same_type_p (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl)),
1029 TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl)));
1031 types_match = decls_match (DECL_TEMPLATE_RESULT (olddecl),
1032 DECL_TEMPLATE_RESULT (newdecl));
1036 /* Need to check scope for variable declaration (VAR_DECL).
1037 For typedef (TYPE_DECL), scope is ignored. */
1038 if (TREE_CODE (newdecl) == VAR_DECL
1039 && CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
1041 Two declarations for an object with C language linkage
1042 with the same name (ignoring the namespace that qualify
1043 it) that appear in different namespace scopes refer to
1045 && !(DECL_EXTERN_C_P (olddecl) && DECL_EXTERN_C_P (newdecl)))
1048 if (TREE_TYPE (newdecl) == error_mark_node)
1049 types_match = TREE_TYPE (olddecl) == error_mark_node;
1050 else if (TREE_TYPE (olddecl) == NULL_TREE)
1051 types_match = TREE_TYPE (newdecl) == NULL_TREE;
1052 else if (TREE_TYPE (newdecl) == NULL_TREE)
1055 types_match = comptypes (TREE_TYPE (newdecl),
1056 TREE_TYPE (olddecl),
1057 COMPARE_REDECLARATION);
1063 /* If NEWDECL is `static' and an `extern' was seen previously,
1064 warn about it. OLDDECL is the previous declaration.
1066 Note that this does not apply to the C++ case of declaring
1067 a variable `extern const' and then later `const'.
1069 Don't complain about built-in functions, since they are beyond
1070 the user's control. */
1073 warn_extern_redeclared_static (tree newdecl, tree olddecl)
1075 if (TREE_CODE (newdecl) == TYPE_DECL
1076 || TREE_CODE (newdecl) == TEMPLATE_DECL
1077 || TREE_CODE (newdecl) == CONST_DECL
1078 || TREE_CODE (newdecl) == NAMESPACE_DECL)
1081 /* Don't get confused by static member functions; that's a different
1083 if (TREE_CODE (newdecl) == FUNCTION_DECL
1084 && DECL_STATIC_FUNCTION_P (newdecl))
1087 /* If the old declaration was `static', or the new one isn't, then
1088 then everything is OK. */
1089 if (DECL_THIS_STATIC (olddecl) || !DECL_THIS_STATIC (newdecl))
1092 /* It's OK to declare a builtin function as `static'. */
1093 if (TREE_CODE (olddecl) == FUNCTION_DECL
1094 && DECL_ARTIFICIAL (olddecl))
1097 permerror (input_location, "%qD was declared %<extern%> and later %<static%>", newdecl);
1098 permerror (input_location, "previous declaration of %q+D", olddecl);
1101 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1102 function templates. If their exception specifications do not
1103 match, issue a diagnostic. */
1106 check_redeclaration_exception_specification (tree new_decl,
1111 tree new_exceptions;
1112 tree old_exceptions;
1114 new_type = TREE_TYPE (new_decl);
1115 new_exceptions = TYPE_RAISES_EXCEPTIONS (new_type);
1116 old_type = TREE_TYPE (old_decl);
1117 old_exceptions = TYPE_RAISES_EXCEPTIONS (old_type);
1121 If any declaration of a function has an exception-specification,
1122 all declarations, including the definition and an explicit
1123 specialization, of that function shall have an
1124 exception-specification with the same set of type-ids. */
1125 if ((pedantic || ! DECL_IN_SYSTEM_HEADER (old_decl))
1126 && ! DECL_IS_BUILTIN (old_decl)
1128 && !comp_except_specs (new_exceptions, old_exceptions, ce_normal))
1130 error ("declaration of %qF has a different exception specifier",
1132 error ("from previous declaration %q+F", old_decl);
1136 /* Return true if OLD_DECL and NEW_DECL agree on constexprness.
1137 Otherwise issue diagnostics. */
1140 validate_constexpr_redeclaration (tree old_decl, tree new_decl)
1142 old_decl = STRIP_TEMPLATE (old_decl);
1143 new_decl = STRIP_TEMPLATE (new_decl);
1144 if (!VAR_OR_FUNCTION_DECL_P (old_decl)
1145 || !VAR_OR_FUNCTION_DECL_P (new_decl))
1147 if (DECL_DECLARED_CONSTEXPR_P (old_decl)
1148 == DECL_DECLARED_CONSTEXPR_P (new_decl))
1150 if (TREE_CODE (old_decl) == FUNCTION_DECL && DECL_BUILT_IN (old_decl))
1152 /* Hide a built-in declaration. */
1153 DECL_DECLARED_CONSTEXPR_P (old_decl)
1154 = DECL_DECLARED_CONSTEXPR_P (new_decl);
1157 error ("redeclaration %qD differs in %<constexpr%>", new_decl);
1158 error ("from previous declaration %q+D", old_decl);
1162 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1163 && lookup_attribute ("gnu_inline", \
1164 DECL_ATTRIBUTES (fn)))
1166 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1167 If the redeclaration is invalid, a diagnostic is issued, and the
1168 error_mark_node is returned. Otherwise, OLDDECL is returned.
1170 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1173 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1176 duplicate_decls (tree newdecl, tree olddecl, bool newdecl_is_friend)
1178 unsigned olddecl_uid = DECL_UID (olddecl);
1179 int olddecl_friend = 0, types_match = 0, hidden_friend = 0;
1180 int new_defines_function = 0;
1181 tree new_template_info;
1183 if (newdecl == olddecl)
1186 types_match = decls_match (newdecl, olddecl);
1188 /* If either the type of the new decl or the type of the old decl is an
1189 error_mark_node, then that implies that we have already issued an
1190 error (earlier) for some bogus type specification, and in that case,
1191 it is rather pointless to harass the user with yet more error message
1192 about the same declaration, so just pretend the types match here. */
1193 if (TREE_TYPE (newdecl) == error_mark_node
1194 || TREE_TYPE (olddecl) == error_mark_node)
1195 return error_mark_node;
1197 if (DECL_P (olddecl)
1198 && TREE_CODE (newdecl) == FUNCTION_DECL
1199 && TREE_CODE (olddecl) == FUNCTION_DECL
1200 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1202 if (DECL_DECLARED_INLINE_P (newdecl)
1203 && DECL_UNINLINABLE (newdecl)
1204 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1205 /* Already warned elsewhere. */;
1206 else if (DECL_DECLARED_INLINE_P (olddecl)
1207 && DECL_UNINLINABLE (olddecl)
1208 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1209 /* Already warned. */;
1210 else if (DECL_DECLARED_INLINE_P (newdecl)
1211 && DECL_UNINLINABLE (olddecl)
1212 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1214 warning (OPT_Wattributes, "function %q+D redeclared as inline",
1216 warning (OPT_Wattributes, "previous declaration of %q+D "
1217 "with attribute noinline", olddecl);
1219 else if (DECL_DECLARED_INLINE_P (olddecl)
1220 && DECL_UNINLINABLE (newdecl)
1221 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1223 warning (OPT_Wattributes, "function %q+D redeclared with "
1224 "attribute noinline", newdecl);
1225 warning (OPT_Wattributes, "previous declaration of %q+D was inline",
1230 /* Check for redeclaration and other discrepancies. */
1231 if (TREE_CODE (olddecl) == FUNCTION_DECL
1232 && DECL_ARTIFICIAL (olddecl))
1234 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl));
1235 if (TREE_CODE (newdecl) != FUNCTION_DECL)
1237 /* Avoid warnings redeclaring built-ins which have not been
1238 explicitly declared. */
1239 if (DECL_ANTICIPATED (olddecl))
1242 /* If you declare a built-in or predefined function name as static,
1243 the old definition is overridden, but optionally warn this was a
1244 bad choice of name. */
1245 if (! TREE_PUBLIC (newdecl))
1247 warning (OPT_Wshadow,
1248 DECL_BUILT_IN (olddecl)
1249 ? G_("shadowing built-in function %q#D")
1250 : G_("shadowing library function %q#D"), olddecl);
1251 /* Discard the old built-in function. */
1254 /* If the built-in is not ansi, then programs can override
1255 it even globally without an error. */
1256 else if (! DECL_BUILT_IN (olddecl))
1257 warning (0, "library function %q#D redeclared as non-function %q#D",
1261 error ("declaration of %q#D", newdecl);
1262 error ("conflicts with built-in declaration %q#D",
1267 else if (!types_match)
1269 /* Avoid warnings redeclaring built-ins which have not been
1270 explicitly declared. */
1271 if (DECL_ANTICIPATED (olddecl))
1273 /* Deal with fileptr_type_node. FILE type is not known
1274 at the time we create the builtins. */
1277 for (t1 = TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1278 t2 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1280 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1283 else if (TREE_VALUE (t2) == fileptr_type_node)
1285 tree t = TREE_VALUE (t1);
1287 if (TREE_CODE (t) == POINTER_TYPE
1288 && TYPE_NAME (TREE_TYPE (t))
1289 && DECL_NAME (TYPE_NAME (TREE_TYPE (t)))
1290 == get_identifier ("FILE")
1291 && compparms (TREE_CHAIN (t1), TREE_CHAIN (t2)))
1293 tree oldargs = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1295 TYPE_ARG_TYPES (TREE_TYPE (olddecl))
1296 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1297 types_match = decls_match (newdecl, olddecl);
1299 return duplicate_decls (newdecl, olddecl,
1301 TYPE_ARG_TYPES (TREE_TYPE (olddecl)) = oldargs;
1304 else if (! same_type_p (TREE_VALUE (t1), TREE_VALUE (t2)))
1307 else if ((DECL_EXTERN_C_P (newdecl)
1308 && DECL_EXTERN_C_P (olddecl))
1309 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1310 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1312 /* A near match; override the builtin. */
1314 if (TREE_PUBLIC (newdecl))
1316 warning (0, "new declaration %q#D", newdecl);
1317 warning (0, "ambiguates built-in declaration %q#D",
1321 warning (OPT_Wshadow,
1322 DECL_BUILT_IN (olddecl)
1323 ? G_("shadowing built-in function %q#D")
1324 : G_("shadowing library function %q#D"), olddecl);
1327 /* Discard the old built-in function. */
1330 /* Replace the old RTL to avoid problems with inlining. */
1331 COPY_DECL_RTL (newdecl, olddecl);
1333 /* Even if the types match, prefer the new declarations type for
1334 built-ins which have not been explicitly declared, for
1335 exception lists, etc... */
1336 else if (DECL_IS_BUILTIN (olddecl))
1338 tree type = TREE_TYPE (newdecl);
1339 tree attribs = (*targetm.merge_type_attributes)
1340 (TREE_TYPE (olddecl), type);
1342 type = cp_build_type_attribute_variant (type, attribs);
1343 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = type;
1346 /* If a function is explicitly declared "throw ()", propagate that to
1347 the corresponding builtin. */
1348 if (DECL_BUILT_IN_CLASS (olddecl) == BUILT_IN_NORMAL
1349 && DECL_ANTICIPATED (olddecl)
1350 && TREE_NOTHROW (newdecl)
1351 && !TREE_NOTHROW (olddecl)
1352 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != NULL_TREE
1353 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != olddecl
1355 TREE_NOTHROW (built_in_decls [DECL_FUNCTION_CODE (olddecl)]) = 1;
1357 /* Whether or not the builtin can throw exceptions has no
1358 bearing on this declarator. */
1359 TREE_NOTHROW (olddecl) = 0;
1361 if (DECL_THIS_STATIC (newdecl) && !DECL_THIS_STATIC (olddecl))
1363 /* If a builtin function is redeclared as `static', merge
1364 the declarations, but make the original one static. */
1365 DECL_THIS_STATIC (olddecl) = 1;
1366 TREE_PUBLIC (olddecl) = 0;
1368 /* Make the old declaration consistent with the new one so
1369 that all remnants of the builtin-ness of this function
1370 will be banished. */
1371 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1372 COPY_DECL_RTL (newdecl, olddecl);
1375 else if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1377 /* C++ Standard, 3.3, clause 4:
1378 "[Note: a namespace name or a class template name must be unique
1379 in its declarative region (7.3.2, clause 14). ]" */
1380 if (TREE_CODE (olddecl) != NAMESPACE_DECL
1381 && TREE_CODE (newdecl) != NAMESPACE_DECL
1382 && (TREE_CODE (olddecl) != TEMPLATE_DECL
1383 || TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) != TYPE_DECL)
1384 && (TREE_CODE (newdecl) != TEMPLATE_DECL
1385 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != TYPE_DECL))
1387 if ((TREE_CODE (olddecl) == TYPE_DECL && DECL_ARTIFICIAL (olddecl)
1388 && TREE_CODE (newdecl) != TYPE_DECL)
1389 || (TREE_CODE (newdecl) == TYPE_DECL && DECL_ARTIFICIAL (newdecl)
1390 && TREE_CODE (olddecl) != TYPE_DECL))
1392 /* We do nothing special here, because C++ does such nasty
1393 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1394 get shadowed, and know that if we need to find a TYPE_DECL
1395 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1396 slot of the identifier. */
1400 if ((TREE_CODE (newdecl) == FUNCTION_DECL
1401 && DECL_FUNCTION_TEMPLATE_P (olddecl))
1402 || (TREE_CODE (olddecl) == FUNCTION_DECL
1403 && DECL_FUNCTION_TEMPLATE_P (newdecl)))
1407 error ("%q#D redeclared as different kind of symbol", newdecl);
1408 if (TREE_CODE (olddecl) == TREE_LIST)
1409 olddecl = TREE_VALUE (olddecl);
1410 error ("previous declaration of %q+#D", olddecl);
1412 return error_mark_node;
1414 else if (!types_match)
1416 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
1417 /* These are certainly not duplicate declarations; they're
1418 from different scopes. */
1421 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1423 /* The name of a class template may not be declared to refer to
1424 any other template, class, function, object, namespace, value,
1425 or type in the same scope. */
1426 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == TYPE_DECL
1427 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1429 error ("declaration of template %q#D", newdecl);
1430 error ("conflicts with previous declaration %q+#D", olddecl);
1432 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == FUNCTION_DECL
1433 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == FUNCTION_DECL
1434 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl))),
1435 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl))))
1436 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1437 DECL_TEMPLATE_PARMS (olddecl))
1438 /* Template functions can be disambiguated by
1440 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl)),
1441 TREE_TYPE (TREE_TYPE (olddecl))))
1443 error ("new declaration %q#D", newdecl);
1444 error ("ambiguates old declaration %q+#D", olddecl);
1448 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1450 if (DECL_EXTERN_C_P (newdecl) && DECL_EXTERN_C_P (olddecl))
1452 error ("declaration of C function %q#D conflicts with",
1454 error ("previous declaration %q+#D here", olddecl);
1456 else if (compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1457 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1459 error ("new declaration %q#D", newdecl);
1460 error ("ambiguates old declaration %q+#D", olddecl);
1461 return error_mark_node;
1468 error ("conflicting declaration %q#D", newdecl);
1469 error ("%q+D has a previous declaration as %q#D", olddecl, olddecl);
1470 return error_mark_node;
1473 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1474 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1475 && (!DECL_TEMPLATE_INFO (newdecl)
1476 || (DECL_TI_TEMPLATE (newdecl)
1477 != DECL_TI_TEMPLATE (olddecl))))
1478 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1479 && (!DECL_TEMPLATE_INFO (olddecl)
1480 || (DECL_TI_TEMPLATE (olddecl)
1481 != DECL_TI_TEMPLATE (newdecl))))))
1482 /* It's OK to have a template specialization and a non-template
1483 with the same type, or to have specializations of two
1484 different templates with the same type. Note that if one is a
1485 specialization, and the other is an instantiation of the same
1486 template, that we do not exit at this point. That situation
1487 can occur if we instantiate a template class, and then
1488 specialize one of its methods. This situation is valid, but
1489 the declarations must be merged in the usual way. */
1491 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1492 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1493 && !DECL_USE_TEMPLATE (newdecl))
1494 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1495 && !DECL_USE_TEMPLATE (olddecl))))
1496 /* One of the declarations is a template instantiation, and the
1497 other is not a template at all. That's OK. */
1499 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1501 /* In [namespace.alias] we have:
1503 In a declarative region, a namespace-alias-definition can be
1504 used to redefine a namespace-alias declared in that declarative
1505 region to refer only to the namespace to which it already
1508 Therefore, if we encounter a second alias directive for the same
1509 alias, we can just ignore the second directive. */
1510 if (DECL_NAMESPACE_ALIAS (newdecl)
1511 && (DECL_NAMESPACE_ALIAS (newdecl)
1512 == DECL_NAMESPACE_ALIAS (olddecl)))
1514 /* [namespace.alias]
1516 A namespace-name or namespace-alias shall not be declared as
1517 the name of any other entity in the same declarative region.
1518 A namespace-name defined at global scope shall not be
1519 declared as the name of any other entity in any global scope
1521 error ("declaration of namespace %qD conflicts with", newdecl);
1522 error ("previous declaration of namespace %q+D here", olddecl);
1523 return error_mark_node;
1527 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1530 error_at (DECL_SOURCE_LOCATION (newdecl), errmsg, newdecl);
1531 if (DECL_NAME (olddecl) != NULL_TREE)
1532 error ((DECL_INITIAL (olddecl) && namespace_bindings_p ())
1533 ? "%q+#D previously defined here"
1534 : "%q+#D previously declared here", olddecl);
1535 return error_mark_node;
1537 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1538 && DECL_INITIAL (olddecl) != NULL_TREE
1539 && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) == NULL_TREE
1540 && TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != NULL_TREE)
1542 /* Prototype decl follows defn w/o prototype. */
1543 warning_at (input_location, 0, "prototype for %q+#D", newdecl);
1544 warning_at (DECL_SOURCE_LOCATION (olddecl), 0,
1545 "follows non-prototype definition here");
1547 else if ((TREE_CODE (olddecl) == FUNCTION_DECL
1548 || TREE_CODE (olddecl) == VAR_DECL)
1549 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1552 If two declarations of the same function or object
1553 specify different linkage-specifications ..., the program
1554 is ill-formed.... Except for functions with C++ linkage,
1555 a function declaration without a linkage specification
1556 shall not precede the first linkage specification for
1557 that function. A function can be declared without a
1558 linkage specification after an explicit linkage
1559 specification has been seen; the linkage explicitly
1560 specified in the earlier declaration is not affected by
1561 such a function declaration.
1563 DR 563 raises the question why the restrictions on
1564 functions should not also apply to objects. Older
1565 versions of G++ silently ignore the linkage-specification
1573 which is clearly wrong. Therefore, we now treat objects
1575 if (current_lang_depth () == 0)
1577 /* There is no explicit linkage-specification, so we use
1578 the linkage from the previous declaration. */
1579 if (!DECL_LANG_SPECIFIC (newdecl))
1580 retrofit_lang_decl (newdecl);
1581 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1585 error ("previous declaration of %q+#D with %qL linkage",
1586 olddecl, DECL_LANGUAGE (olddecl));
1587 error ("conflicts with new declaration with %qL linkage",
1588 DECL_LANGUAGE (newdecl));
1592 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1594 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1596 tree t1 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1597 tree t2 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1600 if (TREE_CODE (TREE_TYPE (newdecl)) == METHOD_TYPE)
1601 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2);
1603 for (; t1 && t1 != void_list_node;
1604 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1605 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1607 if (1 == simple_cst_equal (TREE_PURPOSE (t1),
1610 permerror (input_location, "default argument given for parameter %d of %q#D",
1612 permerror (input_location, "after previous specification in %q+#D", olddecl);
1616 error ("default argument given for parameter %d of %q#D",
1618 error ("after previous specification in %q+#D",
1625 /* Do not merge an implicit typedef with an explicit one. In:
1629 typedef class A A __attribute__ ((foo));
1631 the attribute should apply only to the typedef. */
1632 if (TREE_CODE (olddecl) == TYPE_DECL
1633 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1634 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1637 /* If new decl is `static' and an `extern' was seen previously,
1639 warn_extern_redeclared_static (newdecl, olddecl);
1641 if (!validate_constexpr_redeclaration (olddecl, newdecl))
1642 return error_mark_node;
1644 /* We have committed to returning 1 at this point. */
1645 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1647 /* Now that functions must hold information normally held
1648 by field decls, there is extra work to do so that
1649 declaration information does not get destroyed during
1651 if (DECL_VINDEX (olddecl))
1652 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1653 if (DECL_CONTEXT (olddecl))
1654 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1655 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1656 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1657 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1658 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1659 DECL_INVALID_OVERRIDER_P (newdecl) |= DECL_INVALID_OVERRIDER_P (olddecl);
1660 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1661 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1662 SET_OVERLOADED_OPERATOR_CODE
1663 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1664 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1666 /* Optionally warn about more than one declaration for the same
1667 name, but don't warn about a function declaration followed by a
1669 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1670 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1671 /* Don't warn about extern decl followed by definition. */
1672 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1673 /* Don't warn about friends, let add_friend take care of it. */
1674 && ! (newdecl_is_friend || DECL_FRIEND_P (olddecl)))
1676 warning (OPT_Wredundant_decls, "redundant redeclaration of %qD in same scope", newdecl);
1677 warning (OPT_Wredundant_decls, "previous declaration of %q+D", olddecl);
1680 if (DECL_DELETED_FN (newdecl))
1682 error ("deleted definition of %qD", newdecl);
1683 error ("after previous declaration %q+D", olddecl);
1687 /* Deal with C++: must preserve virtual function table size. */
1688 if (TREE_CODE (olddecl) == TYPE_DECL)
1690 tree newtype = TREE_TYPE (newdecl);
1691 tree oldtype = TREE_TYPE (olddecl);
1693 if (newtype != error_mark_node && oldtype != error_mark_node
1694 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1695 CLASSTYPE_FRIEND_CLASSES (newtype)
1696 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1698 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1701 /* Copy all the DECL_... slots specified in the new decl
1702 except for any that we copy here from the old type. */
1703 DECL_ATTRIBUTES (newdecl)
1704 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1706 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1710 old_result = DECL_TEMPLATE_RESULT (olddecl);
1711 new_result = DECL_TEMPLATE_RESULT (newdecl);
1712 TREE_TYPE (olddecl) = TREE_TYPE (old_result);
1713 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1714 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1715 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1717 DECL_ATTRIBUTES (old_result)
1718 = (*targetm.merge_decl_attributes) (old_result, new_result);
1720 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1722 if (GNU_INLINE_P (old_result) != GNU_INLINE_P (new_result)
1723 && DECL_INITIAL (new_result))
1725 if (DECL_INITIAL (old_result))
1726 DECL_UNINLINABLE (old_result) = 1;
1728 DECL_UNINLINABLE (old_result) = DECL_UNINLINABLE (new_result);
1729 DECL_EXTERNAL (old_result) = DECL_EXTERNAL (new_result);
1730 DECL_NOT_REALLY_EXTERN (old_result)
1731 = DECL_NOT_REALLY_EXTERN (new_result);
1732 DECL_INTERFACE_KNOWN (old_result)
1733 = DECL_INTERFACE_KNOWN (new_result);
1734 DECL_DECLARED_INLINE_P (old_result)
1735 = DECL_DECLARED_INLINE_P (new_result);
1736 DECL_DISREGARD_INLINE_LIMITS (old_result)
1737 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1742 DECL_DECLARED_INLINE_P (old_result)
1743 |= DECL_DECLARED_INLINE_P (new_result);
1744 DECL_DISREGARD_INLINE_LIMITS (old_result)
1745 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1746 check_redeclaration_exception_specification (newdecl, olddecl);
1750 /* If the new declaration is a definition, update the file and
1751 line information on the declaration, and also make
1752 the old declaration the same definition. */
1753 if (DECL_INITIAL (new_result) != NULL_TREE)
1755 DECL_SOURCE_LOCATION (olddecl)
1756 = DECL_SOURCE_LOCATION (old_result)
1757 = DECL_SOURCE_LOCATION (newdecl);
1758 DECL_INITIAL (old_result) = DECL_INITIAL (new_result);
1759 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1762 DECL_ARGUMENTS (old_result)
1763 = DECL_ARGUMENTS (new_result);
1764 for (parm = DECL_ARGUMENTS (old_result); parm;
1765 parm = DECL_CHAIN (parm))
1766 DECL_CONTEXT (parm) = old_result;
1775 /* Automatically handles default parameters. */
1776 tree oldtype = TREE_TYPE (olddecl);
1779 /* Merge the data types specified in the two decls. */
1780 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1782 /* If merge_types produces a non-typedef type, just use the old type. */
1783 if (TREE_CODE (newdecl) == TYPE_DECL
1784 && newtype == DECL_ORIGINAL_TYPE (newdecl))
1787 if (TREE_CODE (newdecl) == VAR_DECL)
1789 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
1790 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
1791 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl)
1792 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl);
1793 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
1794 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
1796 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
1797 if (DECL_LANG_SPECIFIC (olddecl)
1798 && CP_DECL_THREADPRIVATE_P (olddecl))
1800 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
1801 if (!DECL_LANG_SPECIFIC (newdecl))
1802 retrofit_lang_decl (newdecl);
1804 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
1805 CP_DECL_THREADPRIVATE_P (newdecl) = 1;
1809 /* Do this after calling `merge_types' so that default
1810 parameters don't confuse us. */
1811 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1812 check_redeclaration_exception_specification (newdecl, olddecl);
1813 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
1815 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1816 check_default_args (newdecl);
1818 /* Lay the type out, unless already done. */
1819 if (! same_type_p (newtype, oldtype)
1820 && TREE_TYPE (newdecl) != error_mark_node
1821 && !(processing_template_decl && uses_template_parms (newdecl)))
1822 layout_type (TREE_TYPE (newdecl));
1824 if ((TREE_CODE (newdecl) == VAR_DECL
1825 || TREE_CODE (newdecl) == PARM_DECL
1826 || TREE_CODE (newdecl) == RESULT_DECL
1827 || TREE_CODE (newdecl) == FIELD_DECL
1828 || TREE_CODE (newdecl) == TYPE_DECL)
1829 && !(processing_template_decl && uses_template_parms (newdecl)))
1830 layout_decl (newdecl, 0);
1832 /* Merge the type qualifiers. */
1833 if (TREE_READONLY (newdecl))
1834 TREE_READONLY (olddecl) = 1;
1835 if (TREE_THIS_VOLATILE (newdecl))
1836 TREE_THIS_VOLATILE (olddecl) = 1;
1837 if (TREE_NOTHROW (newdecl))
1838 TREE_NOTHROW (olddecl) = 1;
1840 /* Merge deprecatedness. */
1841 if (TREE_DEPRECATED (newdecl))
1842 TREE_DEPRECATED (olddecl) = 1;
1844 /* Preserve function specific target and optimization options */
1845 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1847 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
1848 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
1849 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
1850 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
1852 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
1853 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
1854 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
1855 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
1858 /* Merge the initialization information. */
1859 if (DECL_INITIAL (newdecl) == NULL_TREE
1860 && DECL_INITIAL (olddecl) != NULL_TREE)
1862 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1863 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1864 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1866 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1867 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1871 /* Merge the section attribute.
1872 We want to issue an error if the sections conflict but that must be
1873 done later in decl_attributes since we are called before attributes
1875 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1876 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1878 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1880 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1881 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1882 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1883 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1884 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
1885 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1886 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
1887 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
1888 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1889 DECL_LOOPING_CONST_OR_PURE_P (newdecl)
1890 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl);
1891 /* Keep the old RTL. */
1892 COPY_DECL_RTL (olddecl, newdecl);
1894 else if (TREE_CODE (newdecl) == VAR_DECL
1895 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
1897 /* Keep the old RTL. We cannot keep the old RTL if the old
1898 declaration was for an incomplete object and the new
1899 declaration is not since many attributes of the RTL will
1901 COPY_DECL_RTL (olddecl, newdecl);
1904 /* If cannot merge, then use the new type and qualifiers,
1905 and don't preserve the old rtl. */
1908 /* Clean out any memory we had of the old declaration. */
1909 tree oldstatic = value_member (olddecl, static_aggregates);
1911 TREE_VALUE (oldstatic) = error_mark_node;
1913 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1914 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1915 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1916 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1919 /* Merge the storage class information. */
1920 merge_weak (newdecl, olddecl);
1922 if (DECL_ONE_ONLY (olddecl))
1923 DECL_COMDAT_GROUP (newdecl) = DECL_COMDAT_GROUP (olddecl);
1925 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
1926 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1927 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
1928 if (! DECL_EXTERNAL (olddecl))
1929 DECL_EXTERNAL (newdecl) = 0;
1931 new_template_info = NULL_TREE;
1932 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
1934 bool new_redefines_gnu_inline = false;
1936 if (new_defines_function
1937 && ((DECL_INTERFACE_KNOWN (olddecl)
1938 && TREE_CODE (olddecl) == FUNCTION_DECL)
1939 || (TREE_CODE (olddecl) == TEMPLATE_DECL
1940 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
1941 == FUNCTION_DECL))))
1945 if (TREE_CODE (fn) == TEMPLATE_DECL)
1946 fn = DECL_TEMPLATE_RESULT (olddecl);
1948 new_redefines_gnu_inline = GNU_INLINE_P (fn) && DECL_INITIAL (fn);
1951 if (!new_redefines_gnu_inline)
1953 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
1954 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
1955 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
1957 DECL_TEMPLATE_INSTANTIATED (newdecl)
1958 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
1959 DECL_ODR_USED (newdecl) |= DECL_ODR_USED (olddecl);
1961 /* If the OLDDECL is an instantiation and/or specialization,
1962 then the NEWDECL must be too. But, it may not yet be marked
1963 as such if the caller has created NEWDECL, but has not yet
1964 figured out that it is a redeclaration. */
1965 if (!DECL_USE_TEMPLATE (newdecl))
1966 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
1968 /* Don't really know how much of the language-specific
1969 values we should copy from old to new. */
1970 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
1971 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
1972 DECL_INITIALIZED_IN_CLASS_P (newdecl)
1973 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
1975 if (LANG_DECL_HAS_MIN (newdecl))
1977 DECL_LANG_SPECIFIC (newdecl)->u.min.u2 =
1978 DECL_LANG_SPECIFIC (olddecl)->u.min.u2;
1979 if (DECL_TEMPLATE_INFO (newdecl))
1980 new_template_info = DECL_TEMPLATE_INFO (newdecl);
1981 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
1983 /* Only functions have these fields. */
1984 if (TREE_CODE (newdecl) == FUNCTION_DECL
1985 || DECL_FUNCTION_TEMPLATE_P (newdecl))
1987 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
1988 olddecl_friend = DECL_FRIEND_P (olddecl);
1989 hidden_friend = (DECL_ANTICIPATED (olddecl)
1990 && DECL_HIDDEN_FRIEND_P (olddecl)
1991 && newdecl_is_friend);
1992 DECL_BEFRIENDING_CLASSES (newdecl)
1993 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
1994 DECL_BEFRIENDING_CLASSES (olddecl));
1995 /* DECL_THUNKS is only valid for virtual functions,
1996 otherwise it is a DECL_FRIEND_CONTEXT. */
1997 if (DECL_VIRTUAL_P (newdecl))
1998 DECL_THUNKS (newdecl) = DECL_THUNKS (olddecl);
2000 /* Only variables have this field. */
2001 else if (TREE_CODE (newdecl) == VAR_DECL
2002 && VAR_HAD_UNKNOWN_BOUND (olddecl))
2003 SET_VAR_HAD_UNKNOWN_BOUND (newdecl);
2006 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2010 /* Merge parameter attributes. */
2011 tree oldarg, newarg;
2012 for (oldarg = DECL_ARGUMENTS(olddecl),
2013 newarg = DECL_ARGUMENTS(newdecl);
2015 oldarg = DECL_CHAIN(oldarg), newarg = DECL_CHAIN(newarg)) {
2016 DECL_ATTRIBUTES (newarg)
2017 = (*targetm.merge_decl_attributes) (oldarg, newarg);
2018 DECL_ATTRIBUTES (oldarg) = DECL_ATTRIBUTES (newarg);
2021 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
2022 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
2024 /* If newdecl is not a specialization, then it is not a
2025 template-related function at all. And that means that we
2026 should have exited above, returning 0. */
2027 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
2029 if (DECL_ODR_USED (olddecl))
2030 /* From [temp.expl.spec]:
2032 If a template, a member template or the member of a class
2033 template is explicitly specialized then that
2034 specialization shall be declared before the first use of
2035 that specialization that would cause an implicit
2036 instantiation to take place, in every translation unit in
2037 which such a use occurs. */
2038 error ("explicit specialization of %qD after first use",
2041 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
2043 /* Don't propagate visibility from the template to the
2044 specialization here. We'll do that in determine_visibility if
2046 DECL_VISIBILITY_SPECIFIED (olddecl) = 0;
2048 /* [temp.expl.spec/14] We don't inline explicit specialization
2049 just because the primary template says so. */
2051 else if (new_defines_function && DECL_INITIAL (olddecl))
2053 /* Never inline re-defined extern inline functions.
2054 FIXME: this could be better handled by keeping both
2055 function as separate declarations. */
2056 DECL_UNINLINABLE (newdecl) = 1;
2060 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
2061 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
2063 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
2065 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
2066 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
2068 DECL_DISREGARD_INLINE_LIMITS (newdecl)
2069 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
2070 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
2071 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
2074 /* Preserve abstractness on cloned [cd]tors. */
2075 DECL_ABSTRACT (newdecl) = DECL_ABSTRACT (olddecl);
2077 /* Update newdecl's parms to point at olddecl. */
2078 for (parm = DECL_ARGUMENTS (newdecl); parm;
2079 parm = DECL_CHAIN (parm))
2080 DECL_CONTEXT (parm) = olddecl;
2084 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
2085 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
2086 COPY_DECL_RTL (newdecl, olddecl);
2088 if (! types_match || new_defines_function)
2090 /* These need to be copied so that the names are available.
2091 Note that if the types do match, we'll preserve inline
2092 info and other bits, but if not, we won't. */
2093 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
2094 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
2096 if (new_defines_function)
2097 /* If defining a function declared with other language
2098 linkage, use the previously declared language linkage. */
2099 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
2100 else if (types_match)
2102 /* If redeclaring a builtin function, and not a definition,
2103 it stays built in. */
2104 if (DECL_BUILT_IN (olddecl))
2106 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2107 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2108 /* If we're keeping the built-in definition, keep the rtl,
2109 regardless of declaration matches. */
2110 COPY_DECL_RTL (olddecl, newdecl);
2113 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2114 /* Don't clear out the arguments if we're just redeclaring a
2116 if (DECL_ARGUMENTS (olddecl))
2117 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2120 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
2121 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
2123 /* Now preserve various other info from the definition. */
2124 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
2125 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
2126 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2127 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2129 /* Warn about conflicting visibility specifications. */
2130 if (DECL_VISIBILITY_SPECIFIED (olddecl)
2131 && DECL_VISIBILITY_SPECIFIED (newdecl)
2132 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2134 warning_at (input_location, OPT_Wattributes,
2135 "%q+D: visibility attribute ignored because it", newdecl);
2136 warning_at (DECL_SOURCE_LOCATION (olddecl), OPT_Wattributes,
2137 "conflicts with previous declaration here");
2139 /* Choose the declaration which specified visibility. */
2140 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2142 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2143 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2145 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2146 so keep this behavior. */
2147 if (TREE_CODE (newdecl) == VAR_DECL && DECL_HAS_INIT_PRIORITY_P (newdecl))
2149 SET_DECL_INIT_PRIORITY (olddecl, DECL_INIT_PRIORITY (newdecl));
2150 DECL_HAS_INIT_PRIORITY_P (olddecl) = 1;
2152 /* Likewise for DECL_USER_ALIGN and DECL_PACKED. */
2153 DECL_USER_ALIGN (olddecl) = DECL_USER_ALIGN (newdecl);
2154 if (TREE_CODE (newdecl) == FIELD_DECL)
2155 DECL_PACKED (olddecl) = DECL_PACKED (newdecl);
2157 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2158 with that from NEWDECL below. */
2159 if (DECL_LANG_SPECIFIC (olddecl))
2161 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
2162 != DECL_LANG_SPECIFIC (newdecl));
2163 ggc_free (DECL_LANG_SPECIFIC (olddecl));
2166 /* Merge the USED information. */
2167 if (TREE_USED (olddecl))
2168 TREE_USED (newdecl) = 1;
2169 else if (TREE_USED (newdecl))
2170 TREE_USED (olddecl) = 1;
2171 if (TREE_CODE (newdecl) == VAR_DECL)
2173 if (DECL_READ_P (olddecl))
2174 DECL_READ_P (newdecl) = 1;
2175 else if (DECL_READ_P (newdecl))
2176 DECL_READ_P (olddecl) = 1;
2178 if (DECL_PRESERVE_P (olddecl))
2179 DECL_PRESERVE_P (newdecl) = 1;
2180 else if (DECL_PRESERVE_P (newdecl))
2181 DECL_PRESERVE_P (olddecl) = 1;
2183 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2187 function_size = sizeof (struct tree_decl_common);
2189 memcpy ((char *) olddecl + sizeof (struct tree_common),
2190 (char *) newdecl + sizeof (struct tree_common),
2191 function_size - sizeof (struct tree_common));
2193 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2194 (char *) newdecl + sizeof (struct tree_decl_common),
2195 sizeof (struct tree_function_decl) - sizeof (struct tree_decl_common));
2196 if (new_template_info)
2197 /* If newdecl is a template instantiation, it is possible that
2198 the following sequence of events has occurred:
2200 o A friend function was declared in a class template. The
2201 class template was instantiated.
2203 o The instantiation of the friend declaration was
2204 recorded on the instantiation list, and is newdecl.
2206 o Later, however, instantiate_class_template called pushdecl
2207 on the newdecl to perform name injection. But, pushdecl in
2208 turn called duplicate_decls when it discovered that another
2209 declaration of a global function with the same name already
2212 o Here, in duplicate_decls, we decided to clobber newdecl.
2214 If we're going to do that, we'd better make sure that
2215 olddecl, and not newdecl, is on the list of
2216 instantiations so that if we try to do the instantiation
2217 again we won't get the clobbered declaration. */
2218 reregister_specialization (newdecl,
2224 size_t size = tree_code_size (TREE_CODE (olddecl));
2225 memcpy ((char *) olddecl + sizeof (struct tree_common),
2226 (char *) newdecl + sizeof (struct tree_common),
2227 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2228 switch (TREE_CODE (olddecl))
2238 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2239 (char *) newdecl + sizeof (struct tree_decl_common),
2240 size - sizeof (struct tree_decl_common)
2241 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2245 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2246 (char *) newdecl + sizeof (struct tree_decl_common),
2247 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)
2248 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2252 DECL_UID (olddecl) = olddecl_uid;
2254 DECL_FRIEND_P (olddecl) = 1;
2257 DECL_ANTICIPATED (olddecl) = 1;
2258 DECL_HIDDEN_FRIEND_P (olddecl) = 1;
2261 /* NEWDECL contains the merged attribute lists.
2262 Update OLDDECL to be the same. */
2263 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2265 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2266 so that encode_section_info has a chance to look at the new decl
2267 flags and attributes. */
2268 if (DECL_RTL_SET_P (olddecl)
2269 && (TREE_CODE (olddecl) == FUNCTION_DECL
2270 || (TREE_CODE (olddecl) == VAR_DECL
2271 && TREE_STATIC (olddecl))))
2272 make_decl_rtl (olddecl);
2274 /* The NEWDECL will no longer be needed. Because every out-of-class
2275 declaration of a member results in a call to duplicate_decls,
2276 freeing these nodes represents in a significant savings. */
2282 /* Return zero if the declaration NEWDECL is valid
2283 when the declaration OLDDECL (assumed to be for the same name)
2284 has already been seen.
2285 Otherwise return an error message format string with a %s
2286 where the identifier should go. */
2289 redeclaration_error_message (tree newdecl, tree olddecl)
2291 if (TREE_CODE (newdecl) == TYPE_DECL)
2293 /* Because C++ can put things into name space for free,
2294 constructs like "typedef struct foo { ... } foo"
2295 would look like an erroneous redeclaration. */
2296 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
2299 return G_("redefinition of %q#D");
2301 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2303 /* If this is a pure function, its olddecl will actually be
2304 the original initialization to `0' (which we force to call
2305 abort()). Don't complain about redefinition in this case. */
2306 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
2307 && DECL_INITIAL (olddecl) == NULL_TREE)
2310 /* If both functions come from different namespaces, this is not
2311 a redeclaration - this is a conflict with a used function. */
2312 if (DECL_NAMESPACE_SCOPE_P (olddecl)
2313 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
2314 && ! decls_match (olddecl, newdecl))
2315 return G_("%qD conflicts with used function");
2317 /* We'll complain about linkage mismatches in
2318 warn_extern_redeclared_static. */
2320 /* Defining the same name twice is no good. */
2321 if (DECL_INITIAL (olddecl) != NULL_TREE
2322 && DECL_INITIAL (newdecl) != NULL_TREE)
2324 if (DECL_NAME (olddecl) == NULL_TREE)
2325 return G_("%q#D not declared in class");
2326 else if (!GNU_INLINE_P (olddecl)
2327 || GNU_INLINE_P (newdecl))
2328 return G_("redefinition of %q#D");
2331 if (DECL_DECLARED_INLINE_P (olddecl) && DECL_DECLARED_INLINE_P (newdecl))
2333 bool olda = GNU_INLINE_P (olddecl);
2334 bool newa = GNU_INLINE_P (newdecl);
2339 return G_("%q+D redeclared inline with "
2340 "%<gnu_inline%> attribute");
2342 return G_("%q+D redeclared inline without "
2343 "%<gnu_inline%> attribute");
2349 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
2353 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
2355 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
2356 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
2357 return G_("redefinition of %q#D");
2361 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
2362 || (DECL_TEMPLATE_RESULT (newdecl)
2363 == DECL_TEMPLATE_RESULT (olddecl)))
2366 nt = DECL_TEMPLATE_RESULT (newdecl);
2367 if (DECL_TEMPLATE_INFO (nt))
2368 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
2369 ot = DECL_TEMPLATE_RESULT (olddecl);
2370 if (DECL_TEMPLATE_INFO (ot))
2371 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
2372 if (DECL_INITIAL (nt) && DECL_INITIAL (ot)
2373 && (!GNU_INLINE_P (ot) || GNU_INLINE_P (nt)))
2374 return G_("redefinition of %q#D");
2376 if (DECL_DECLARED_INLINE_P (ot) && DECL_DECLARED_INLINE_P (nt))
2378 bool olda = GNU_INLINE_P (ot);
2379 bool newa = GNU_INLINE_P (nt);
2384 return G_("%q+D redeclared inline with "
2385 "%<gnu_inline%> attribute");
2387 return G_("%q+D redeclared inline without "
2388 "%<gnu_inline%> attribute");
2392 /* Core issue #226 (C++0x):
2394 If a friend function template declaration specifies a
2395 default template-argument, that declaration shall be a
2396 definition and shall be the only declaration of the
2397 function template in the translation unit. */
2398 if ((cxx_dialect != cxx98)
2399 && TREE_CODE (ot) == FUNCTION_DECL && DECL_FRIEND_P (ot)
2400 && !check_default_tmpl_args (nt, DECL_TEMPLATE_PARMS (newdecl),
2401 /*is_primary=*/1, /*is_partial=*/0,
2402 /*is_friend_decl=*/2))
2403 return G_("redeclaration of friend %q#D "
2404 "may not have default template arguments");
2408 else if (TREE_CODE (newdecl) == VAR_DECL
2409 && DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl)
2410 && (! DECL_LANG_SPECIFIC (olddecl)
2411 || ! CP_DECL_THREADPRIVATE_P (olddecl)
2412 || DECL_THREAD_LOCAL_P (newdecl)))
2414 /* Only variables can be thread-local, and all declarations must
2415 agree on this property. */
2416 if (DECL_THREAD_LOCAL_P (newdecl))
2417 return G_("thread-local declaration of %q#D follows "
2418 "non-thread-local declaration");
2420 return G_("non-thread-local declaration of %q#D follows "
2421 "thread-local declaration");
2423 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2425 /* The objects have been declared at namespace scope. If either
2426 is a member of an anonymous union, then this is an invalid
2427 redeclaration. For example:
2433 if ((TREE_CODE (newdecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (newdecl))
2434 || (TREE_CODE (olddecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (olddecl)))
2435 return G_("redeclaration of %q#D");
2436 /* If at least one declaration is a reference, there is no
2437 conflict. For example:
2443 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2445 /* Reject two definitions. */
2446 return G_("redefinition of %q#D");
2450 /* Objects declared with block scope: */
2451 /* Reject two definitions, and reject a definition
2452 together with an external reference. */
2453 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2454 return G_("redeclaration of %q#D");
2459 /* Hash and equality functions for the named_label table. */
2462 named_label_entry_hash (const void *data)
2464 const struct named_label_entry *ent = (const struct named_label_entry *) data;
2465 return DECL_UID (ent->label_decl);
2469 named_label_entry_eq (const void *a, const void *b)
2471 const struct named_label_entry *ent_a = (const struct named_label_entry *) a;
2472 const struct named_label_entry *ent_b = (const struct named_label_entry *) b;
2473 return ent_a->label_decl == ent_b->label_decl;
2476 /* Create a new label, named ID. */
2479 make_label_decl (tree id, int local_p)
2481 struct named_label_entry *ent;
2485 decl = build_decl (input_location, LABEL_DECL, id, void_type_node);
2487 DECL_CONTEXT (decl) = current_function_decl;
2488 DECL_MODE (decl) = VOIDmode;
2489 C_DECLARED_LABEL_FLAG (decl) = local_p;
2491 /* Say where one reference is to the label, for the sake of the
2492 error if it is not defined. */
2493 DECL_SOURCE_LOCATION (decl) = input_location;
2495 /* Record the fact that this identifier is bound to this label. */
2496 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2498 /* Create the label htab for the function on demand. */
2500 named_labels = htab_create_ggc (13, named_label_entry_hash,
2501 named_label_entry_eq, NULL);
2503 /* Record this label on the list of labels used in this function.
2504 We do this before calling make_label_decl so that we get the
2505 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2506 ent = ggc_alloc_cleared_named_label_entry ();
2507 ent->label_decl = decl;
2509 slot = htab_find_slot (named_labels, ent, INSERT);
2510 gcc_assert (*slot == NULL);
2516 /* Look for a label named ID in the current function. If one cannot
2517 be found, create one. (We keep track of used, but undefined,
2518 labels, and complain about them at the end of a function.) */
2521 lookup_label (tree id)
2525 timevar_push (TV_NAME_LOOKUP);
2526 /* You can't use labels at global scope. */
2527 if (current_function_decl == NULL_TREE)
2529 error ("label %qE referenced outside of any function", id);
2530 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, NULL_TREE);
2533 /* See if we've already got this label. */
2534 decl = IDENTIFIER_LABEL_VALUE (id);
2535 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2536 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2538 decl = make_label_decl (id, /*local_p=*/0);
2539 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2542 /* Declare a local label named ID. */
2545 declare_local_label (tree id)
2548 cp_label_binding *bind;
2550 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2551 this scope we can restore the old value of IDENTIFIER_TYPE_VALUE. */
2552 bind = VEC_safe_push (cp_label_binding, gc,
2553 current_binding_level->shadowed_labels, NULL);
2554 bind->prev_value = IDENTIFIER_LABEL_VALUE (id);
2556 decl = make_label_decl (id, /*local_p=*/1);
2562 /* Returns nonzero if it is ill-formed to jump past the declaration of
2563 DECL. Returns 2 if it's also a real problem. */
2566 decl_jump_unsafe (tree decl)
2568 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
2569 with automatic storage duration is not in scope to a point where it is
2570 in scope is ill-formed unless the variable has scalar type, class type
2571 with a trivial default constructor and a trivial destructor, a
2572 cv-qualified version of one of these types, or an array of one of the
2573 preceding types and is declared without an initializer (8.5). */
2574 tree type = TREE_TYPE (decl);
2576 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl)
2577 || type == error_mark_node)
2580 type = strip_array_types (type);
2582 if (type_has_nontrivial_default_init (TREE_TYPE (decl))
2583 || DECL_NONTRIVIALLY_INITIALIZED_P (decl))
2586 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2592 /* A subroutine of check_previous_goto_1 to identify a branch to the user. */
2595 identify_goto (tree decl, const location_t *locus)
2598 permerror (input_location, "jump to label %qD", decl);
2600 permerror (input_location, "jump to case label");
2602 permerror (*locus, " from here");
2605 /* Check that a single previously seen jump to a newly defined label
2606 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2607 the jump context; NAMES are the names in scope in LEVEL at the jump
2608 context; LOCUS is the source position of the jump or 0. Returns
2609 true if all is well. */
2612 check_previous_goto_1 (tree decl, struct cp_binding_level* level, tree names,
2613 bool exited_omp, const location_t *locus)
2615 struct cp_binding_level *b;
2616 bool identified = false, saw_eh = false, saw_omp = false;
2620 identify_goto (decl, locus);
2621 error (" exits OpenMP structured block");
2622 identified = saw_omp = true;
2625 for (b = current_binding_level; b ; b = b->level_chain)
2627 tree new_decls, old_decls = (b == level ? names : NULL_TREE);
2629 for (new_decls = b->names; new_decls != old_decls;
2630 new_decls = DECL_CHAIN (new_decls))
2632 int problem = decl_jump_unsafe (new_decls);
2638 identify_goto (decl, locus);
2642 error (" crosses initialization of %q+#D", new_decls);
2644 permerror (input_location, " enters scope of %q+#D which has "
2645 "non-trivial destructor", new_decls);
2650 if ((b->kind == sk_try || b->kind == sk_catch) && !saw_eh)
2654 identify_goto (decl, locus);
2657 if (b->kind == sk_try)
2658 error (" enters try block");
2660 error (" enters catch block");
2663 if (b->kind == sk_omp && !saw_omp)
2667 identify_goto (decl, locus);
2670 error (" enters OpenMP structured block");
2679 check_previous_goto (tree decl, struct named_label_use_entry *use)
2681 check_previous_goto_1 (decl, use->binding_level,
2682 use->names_in_scope, use->in_omp_scope,
2683 &use->o_goto_locus);
2687 check_switch_goto (struct cp_binding_level* level)
2689 return check_previous_goto_1 (NULL_TREE, level, level->names, false, NULL);
2692 /* Check that a new jump to a label DECL is OK. Called by
2693 finish_goto_stmt. */
2696 check_goto (tree decl)
2698 struct named_label_entry *ent, dummy;
2699 bool saw_catch = false, identified = false;
2703 /* We can't know where a computed goto is jumping.
2704 So we assume that it's OK. */
2705 if (TREE_CODE (decl) != LABEL_DECL)
2708 /* We didn't record any information about this label when we created it,
2709 and there's not much point since it's trivial to analyze as a return. */
2710 if (decl == cdtor_label)
2713 dummy.label_decl = decl;
2714 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2715 gcc_assert (ent != NULL);
2717 /* If the label hasn't been defined yet, defer checking. */
2718 if (! DECL_INITIAL (decl))
2720 struct named_label_use_entry *new_use;
2722 /* Don't bother creating another use if the last goto had the
2723 same data, and will therefore create the same set of errors. */
2725 && ent->uses->names_in_scope == current_binding_level->names)
2728 new_use = ggc_alloc_named_label_use_entry ();
2729 new_use->binding_level = current_binding_level;
2730 new_use->names_in_scope = current_binding_level->names;
2731 new_use->o_goto_locus = input_location;
2732 new_use->in_omp_scope = false;
2734 new_use->next = ent->uses;
2735 ent->uses = new_use;
2739 if (ent->in_try_scope || ent->in_catch_scope
2740 || ent->in_omp_scope || !VEC_empty (tree, ent->bad_decls))
2742 permerror (input_location, "jump to label %q+D", decl);
2743 permerror (input_location, " from here");
2747 FOR_EACH_VEC_ELT (tree, ent->bad_decls, ix, bad)
2749 int u = decl_jump_unsafe (bad);
2751 if (u > 1 && DECL_ARTIFICIAL (bad))
2753 /* Can't skip init of __exception_info. */
2754 error_at (DECL_SOURCE_LOCATION (bad), " enters catch block");
2758 error (" skips initialization of %q+#D", bad);
2760 permerror (input_location, " enters scope of %q+#D which has "
2761 "non-trivial destructor", bad);
2764 if (ent->in_try_scope)
2765 error (" enters try block");
2766 else if (ent->in_catch_scope && !saw_catch)
2767 error (" enters catch block");
2769 if (ent->in_omp_scope)
2770 error (" enters OpenMP structured block");
2771 else if (flag_openmp)
2773 struct cp_binding_level *b;
2774 for (b = current_binding_level; b ; b = b->level_chain)
2776 if (b == ent->binding_level)
2778 if (b->kind == sk_omp)
2782 permerror (input_location, "jump to label %q+D", decl);
2783 permerror (input_location, " from here");
2786 error (" exits OpenMP structured block");
2793 /* Check that a return is ok wrt OpenMP structured blocks.
2794 Called by finish_return_stmt. Returns true if all is well. */
2797 check_omp_return (void)
2799 struct cp_binding_level *b;
2800 for (b = current_binding_level; b ; b = b->level_chain)
2801 if (b->kind == sk_omp)
2803 error ("invalid exit from OpenMP structured block");
2809 /* Define a label, specifying the location in the source file.
2810 Return the LABEL_DECL node for the label. */
2813 define_label (location_t location, tree name)
2815 struct named_label_entry *ent, dummy;
2816 struct cp_binding_level *p;
2819 timevar_push (TV_NAME_LOOKUP);
2821 decl = lookup_label (name);
2823 dummy.label_decl = decl;
2824 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2825 gcc_assert (ent != NULL);
2827 /* After labels, make any new cleanups in the function go into their
2828 own new (temporary) binding contour. */
2829 for (p = current_binding_level;
2830 p->kind != sk_function_parms;
2832 p->more_cleanups_ok = 0;
2834 if (name == get_identifier ("wchar_t"))
2835 permerror (input_location, "label named wchar_t");
2837 if (DECL_INITIAL (decl) != NULL_TREE)
2839 error ("duplicate label %qD", decl);
2840 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
2844 struct named_label_use_entry *use;
2846 /* Mark label as having been defined. */
2847 DECL_INITIAL (decl) = error_mark_node;
2848 /* Say where in the source. */
2849 DECL_SOURCE_LOCATION (decl) = location;
2851 ent->binding_level = current_binding_level;
2852 ent->names_in_scope = current_binding_level->names;
2854 for (use = ent->uses; use ; use = use->next)
2855 check_previous_goto (decl, use);
2859 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2864 struct cp_binding_level *level;
2865 struct cp_switch *next;
2866 /* The SWITCH_STMT being built. */
2868 /* A splay-tree mapping the low element of a case range to the high
2869 element, or NULL_TREE if there is no high element. Used to
2870 determine whether or not a new case label duplicates an old case
2871 label. We need a tree, rather than simply a hash table, because
2872 of the GNU case range extension. */
2876 /* A stack of the currently active switch statements. The innermost
2877 switch statement is on the top of the stack. There is no need to
2878 mark the stack for garbage collection because it is only active
2879 during the processing of the body of a function, and we never
2880 collect at that point. */
2882 static struct cp_switch *switch_stack;
2884 /* Called right after a switch-statement condition is parsed.
2885 SWITCH_STMT is the switch statement being parsed. */
2888 push_switch (tree switch_stmt)
2890 struct cp_switch *p = XNEW (struct cp_switch);
2891 p->level = current_binding_level;
2892 p->next = switch_stack;
2893 p->switch_stmt = switch_stmt;
2894 p->cases = splay_tree_new (case_compare, NULL, NULL);
2901 struct cp_switch *cs = switch_stack;
2902 location_t switch_location;
2904 /* Emit warnings as needed. */
2905 switch_location = EXPR_LOC_OR_HERE (cs->switch_stmt);
2906 if (!processing_template_decl)
2907 c_do_switch_warnings (cs->cases, switch_location,
2908 SWITCH_STMT_TYPE (cs->switch_stmt),
2909 SWITCH_STMT_COND (cs->switch_stmt));
2911 splay_tree_delete (cs->cases);
2912 switch_stack = switch_stack->next;
2916 /* Note that we've seen a definition of a case label, and complain if this
2917 is a bad place for one. */
2920 finish_case_label (location_t loc, tree low_value, tree high_value)
2923 struct cp_binding_level *p;
2925 if (processing_template_decl)
2929 /* For templates, just add the case label; we'll do semantic
2930 analysis at instantiation-time. */
2931 label = build_decl (loc, LABEL_DECL, NULL_TREE, NULL_TREE);
2932 return add_stmt (build_case_label (loc, low_value, high_value, label));
2935 /* Find the condition on which this switch statement depends. */
2936 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
2937 if (cond && TREE_CODE (cond) == TREE_LIST)
2938 cond = TREE_VALUE (cond);
2940 if (!check_switch_goto (switch_stack->level))
2941 return error_mark_node;
2944 low_value = cxx_constant_value (low_value);
2946 high_value = cxx_constant_value (high_value);
2948 r = c_add_case_label (loc, switch_stack->cases, cond,
2949 SWITCH_STMT_TYPE (switch_stack->switch_stmt),
2950 low_value, high_value);
2952 /* After labels, make any new cleanups in the function go into their
2953 own new (temporary) binding contour. */
2954 for (p = current_binding_level;
2955 p->kind != sk_function_parms;
2957 p->more_cleanups_ok = 0;
2962 /* Hash a TYPENAME_TYPE. K is really of type `tree'. */
2965 typename_hash (const void* k)
2968 const_tree const t = (const_tree) k;
2970 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
2971 ^ htab_hash_pointer (DECL_NAME (TYPE_NAME (t))));
2976 typedef struct typename_info {
2984 /* Compare two TYPENAME_TYPEs. K1 is really of type `tree', K2 is
2985 really of type `typename_info*' */
2988 typename_compare (const void * k1, const void * k2)
2990 const_tree const t1 = (const_tree) k1;
2991 const typename_info *const t2 = (const typename_info *) k2;
2993 return (DECL_NAME (TYPE_NAME (t1)) == t2->name
2994 && TYPE_CONTEXT (t1) == t2->scope
2995 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
2996 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
2997 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
3000 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
3001 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
3003 Returns the new TYPENAME_TYPE. */
3005 static GTY ((param_is (union tree_node))) htab_t typename_htab;
3008 build_typename_type (tree context, tree name, tree fullname,
3009 enum tag_types tag_type)
3017 if (typename_htab == NULL)
3018 typename_htab = htab_create_ggc (61, &typename_hash,
3019 &typename_compare, NULL);
3021 ti.scope = FROB_CONTEXT (context);
3023 ti.template_id = fullname;
3024 ti.enum_p = tag_type == enum_type;
3025 ti.class_p = (tag_type == class_type
3026 || tag_type == record_type
3027 || tag_type == union_type);
3028 hash = (htab_hash_pointer (ti.scope)
3029 ^ htab_hash_pointer (ti.name));
3031 /* See if we already have this type. */
3032 e = htab_find_slot_with_hash (typename_htab, &ti, hash, INSERT);
3037 /* Build the TYPENAME_TYPE. */
3038 t = cxx_make_type (TYPENAME_TYPE);
3039 TYPE_CONTEXT (t) = ti.scope;
3040 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
3041 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
3042 TYPENAME_IS_CLASS_P (t) = ti.class_p;
3044 /* Build the corresponding TYPE_DECL. */
3045 d = build_decl (input_location, TYPE_DECL, name, t);
3046 TYPE_NAME (TREE_TYPE (d)) = d;
3047 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3048 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3049 DECL_ARTIFICIAL (d) = 1;
3051 /* Store it in the hash table. */
3054 /* TYPENAME_TYPEs must always be compared structurally, because
3055 they may or may not resolve down to another type depending on
3056 the currently open classes. */
3057 SET_TYPE_STRUCTURAL_EQUALITY (t);
3063 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
3064 provided to name the type. Returns an appropriate type, unless an
3065 error occurs, in which case error_mark_node is returned. If we
3066 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
3067 return that, rather than the _TYPE it corresponds to, in other
3068 cases we look through the type decl. If TF_ERROR is set, complain
3069 about errors, otherwise be quiet. */
3072 make_typename_type (tree context, tree name, enum tag_types tag_type,
3073 tsubst_flags_t complain)
3079 if (name == error_mark_node
3080 || context == NULL_TREE
3081 || context == error_mark_node)
3082 return error_mark_node;
3086 if (!(TYPE_LANG_SPECIFIC (name)
3087 && (CLASSTYPE_IS_TEMPLATE (name)
3088 || CLASSTYPE_USE_TEMPLATE (name))))
3089 name = TYPE_IDENTIFIER (name);
3091 /* Create a TEMPLATE_ID_EXPR for the type. */
3092 name = build_nt (TEMPLATE_ID_EXPR,
3093 CLASSTYPE_TI_TEMPLATE (name),
3094 CLASSTYPE_TI_ARGS (name));
3096 else if (TREE_CODE (name) == TYPE_DECL)
3097 name = DECL_NAME (name);
3101 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
3103 name = TREE_OPERAND (name, 0);
3104 if (TREE_CODE (name) == TEMPLATE_DECL)
3105 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
3106 else if (TREE_CODE (name) == OVERLOAD)
3108 error ("%qD is not a type", name);
3109 return error_mark_node;
3112 if (TREE_CODE (name) == TEMPLATE_DECL)
3114 error ("%qD used without template parameters", name);
3115 return error_mark_node;
3117 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3118 gcc_assert (TYPE_P (context));
3120 if (!MAYBE_CLASS_TYPE_P (context))
3122 if (complain & tf_error)
3123 error ("%q#T is not a class", context);
3124 return error_mark_node;
3127 /* When the CONTEXT is a dependent type, NAME could refer to a
3128 dependent base class of CONTEXT. But look inside it anyway
3129 if CONTEXT is a currently open scope, in case it refers to a
3130 member of the current instantiation or a non-dependent base;
3131 lookup will stop when we hit a dependent base. */
3132 if (!dependent_scope_p (context))
3133 /* We should only set WANT_TYPE when we're a nested typename type.
3134 Then we can give better diagnostics if we find a non-type. */
3135 t = lookup_field (context, name, 2, /*want_type=*/true);
3139 if ((!t || TREE_CODE (t) == TREE_LIST) && dependent_type_p (context))
3140 return build_typename_type (context, name, fullname, tag_type);
3142 want_template = TREE_CODE (fullname) == TEMPLATE_ID_EXPR;
3146 if (complain & tf_error)
3147 error (want_template ? "no class template named %q#T in %q#T"
3148 : "no type named %q#T in %q#T", name, context);
3149 return error_mark_node;
3152 /* Pull out the template from an injected-class-name (or multiple). */
3154 t = maybe_get_template_decl_from_type_decl (t);
3156 if (TREE_CODE (t) == TREE_LIST)
3158 if (complain & tf_error)
3160 error ("lookup of %qT in %qT is ambiguous", name, context);
3161 print_candidates (t);
3163 return error_mark_node;
3166 if (want_template && !DECL_CLASS_TEMPLATE_P (t))
3168 if (complain & tf_error)
3169 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3171 return error_mark_node;
3173 if (!want_template && TREE_CODE (t) != TYPE_DECL)
3175 if (complain & tf_error)
3176 error ("%<typename %T::%D%> names %q#T, which is not a type",
3178 return error_mark_node;
3181 if (complain & tf_error)
3182 perform_or_defer_access_check (TYPE_BINFO (context), t, t);
3184 /* If we are currently parsing a template and if T is a typedef accessed
3185 through CONTEXT then we need to remember and check access of T at
3186 template instantiation time. */
3187 add_typedef_to_current_template_for_access_check (t, context, input_location);
3190 return lookup_template_class (t, TREE_OPERAND (fullname, 1),
3192 /*entering_scope=*/0,
3193 tf_warning_or_error | tf_user);
3195 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
3201 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3202 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3203 in which case error_mark_node is returned.
3205 If PARM_LIST is non-NULL, also make sure that the template parameter
3206 list of TEMPLATE_DECL matches.
3208 If COMPLAIN zero, don't complain about any errors that occur. */
3211 make_unbound_class_template (tree context, tree name, tree parm_list,
3212 tsubst_flags_t complain)
3218 name = TYPE_IDENTIFIER (name);
3219 else if (DECL_P (name))
3220 name = DECL_NAME (name);
3221 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3223 if (!dependent_type_p (context)
3224 || currently_open_class (context))
3226 tree tmpl = NULL_TREE;
3228 if (MAYBE_CLASS_TYPE_P (context))
3229 tmpl = lookup_field (context, name, 0, false);
3231 if (tmpl && TREE_CODE (tmpl) == TYPE_DECL)
3232 tmpl = maybe_get_template_decl_from_type_decl (tmpl);
3234 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
3236 if (complain & tf_error)
3237 error ("no class template named %q#T in %q#T", name, context);
3238 return error_mark_node;
3242 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
3244 if (complain & tf_error)
3246 error ("template parameters do not match template");
3247 error ("%q+D declared here", tmpl);
3249 return error_mark_node;
3252 if (complain & tf_error)
3253 perform_or_defer_access_check (TYPE_BINFO (context), tmpl, tmpl);
3258 /* Build the UNBOUND_CLASS_TEMPLATE. */
3259 t = cxx_make_type (UNBOUND_CLASS_TEMPLATE);
3260 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
3261 TREE_TYPE (t) = NULL_TREE;
3262 SET_TYPE_STRUCTURAL_EQUALITY (t);
3264 /* Build the corresponding TEMPLATE_DECL. */
3265 d = build_decl (input_location, TEMPLATE_DECL, name, t);
3266 TYPE_NAME (TREE_TYPE (d)) = d;
3267 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3268 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3269 DECL_ARTIFICIAL (d) = 1;
3270 DECL_TEMPLATE_PARMS (d) = parm_list;
3277 /* Push the declarations of builtin types into the namespace.
3278 RID_INDEX is the index of the builtin type in the array
3279 RID_POINTERS. NAME is the name used when looking up the builtin
3280 type. TYPE is the _TYPE node for the builtin type. */
3283 record_builtin_type (enum rid rid_index,
3287 tree rname = NULL_TREE, tname = NULL_TREE;
3288 tree tdecl = NULL_TREE;
3290 if ((int) rid_index < (int) RID_MAX)
3291 rname = ridpointers[(int) rid_index];
3293 tname = get_identifier (name);
3295 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
3296 eliminated. Built-in types should not be looked up name; their
3297 names are keywords that the parser can recognize. However, there
3298 is code in c-common.c that uses identifier_global_value to look
3299 up built-in types by name. */
3302 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, tname, type);
3303 DECL_ARTIFICIAL (tdecl) = 1;
3304 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
3310 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, rname, type);
3311 DECL_ARTIFICIAL (tdecl) = 1;
3313 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
3316 if (!TYPE_NAME (type))
3317 TYPE_NAME (type) = tdecl;
3320 debug_hooks->type_decl (tdecl, 0);
3323 /* Record one of the standard Java types.
3324 * Declare it as having the given NAME.
3325 * If SIZE > 0, it is the size of one of the integral types;
3326 * otherwise it is the negative of the size of one of the other types. */
3329 record_builtin_java_type (const char* name, int size)
3333 type = build_nonstandard_integer_type (size, 0);
3334 else if (size > -32)
3337 /* "__java_char" or ""__java_boolean". */
3338 type = build_nonstandard_integer_type (-size, 1);
3339 /* Get the signed type cached and attached to the unsigned type,
3340 so it doesn't get garbage-collected at "random" times,
3341 causing potential codegen differences out of different UIDs
3342 and different alias set numbers. */
3343 stype = build_nonstandard_integer_type (-size, 0);
3344 TREE_CHAIN (type) = stype;
3345 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
3348 { /* "__java_float" or ""__java_double". */
3349 type = make_node (REAL_TYPE);
3350 TYPE_PRECISION (type) = - size;
3353 record_builtin_type (RID_MAX, name, type);
3354 decl = TYPE_NAME (type);
3356 /* Suppress generate debug symbol entries for these types,
3357 since for normal C++ they are just clutter.
3358 However, push_lang_context undoes this if extern "Java" is seen. */
3359 DECL_IGNORED_P (decl) = 1;
3361 TYPE_FOR_JAVA (type) = 1;
3365 /* Push a type into the namespace so that the back ends ignore it. */
3368 record_unknown_type (tree type, const char* name)
3370 tree decl = pushdecl (build_decl (UNKNOWN_LOCATION,
3371 TYPE_DECL, get_identifier (name), type));
3372 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3373 DECL_IGNORED_P (decl) = 1;
3374 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
3375 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
3376 TYPE_ALIGN (type) = 1;
3377 TYPE_USER_ALIGN (type) = 0;
3378 SET_TYPE_MODE (type, TYPE_MODE (void_type_node));
3381 /* A string for which we should create an IDENTIFIER_NODE at
3384 typedef struct predefined_identifier
3386 /* The name of the identifier. */
3387 const char *const name;
3388 /* The place where the IDENTIFIER_NODE should be stored. */
3390 /* Nonzero if this is the name of a constructor or destructor. */
3391 const int ctor_or_dtor_p;
3392 } predefined_identifier;
3394 /* Create all the predefined identifiers. */
3397 initialize_predefined_identifiers (void)
3399 const predefined_identifier *pid;
3401 /* A table of identifiers to create at startup. */
3402 static const predefined_identifier predefined_identifiers[] = {
3403 { "C++", &lang_name_cplusplus, 0 },
3404 { "C", &lang_name_c, 0 },
3405 { "Java", &lang_name_java, 0 },
3406 /* Some of these names have a trailing space so that it is
3407 impossible for them to conflict with names written by users. */
3408 { "__ct ", &ctor_identifier, 1 },
3409 { "__base_ctor ", &base_ctor_identifier, 1 },
3410 { "__comp_ctor ", &complete_ctor_identifier, 1 },
3411 { "__dt ", &dtor_identifier, 1 },
3412 { "__comp_dtor ", &complete_dtor_identifier, 1 },
3413 { "__base_dtor ", &base_dtor_identifier, 1 },
3414 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
3415 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
3416 { "nelts", &nelts_identifier, 0 },
3417 { THIS_NAME, &this_identifier, 0 },
3418 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
3419 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
3420 { "_vptr", &vptr_identifier, 0 },
3421 { "__vtt_parm", &vtt_parm_identifier, 0 },
3422 { "::", &global_scope_name, 0 },
3423 { "std", &std_identifier, 0 },
3427 for (pid = predefined_identifiers; pid->name; ++pid)
3429 *pid->node = get_identifier (pid->name);
3430 if (pid->ctor_or_dtor_p)
3431 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
3435 /* Create the predefined scalar types of C,
3436 and some nodes representing standard constants (0, 1, (void *)0).
3437 Initialize the global binding level.
3438 Make definitions for built-in primitive functions. */
3441 cxx_init_decl_processing (void)
3444 tree void_ftype_ptr;
3446 build_common_tree_nodes (flag_signed_char);
3448 /* Create all the identifiers we need. */
3449 initialize_predefined_identifiers ();
3451 /* Create the global variables. */
3452 push_to_top_level ();
3454 current_function_decl = NULL_TREE;
3455 current_binding_level = NULL;
3456 /* Enter the global namespace. */
3457 gcc_assert (global_namespace == NULL_TREE);
3458 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
3460 DECL_CONTEXT (global_namespace) = build_translation_unit_decl (NULL_TREE);
3461 TREE_PUBLIC (global_namespace) = 1;
3462 begin_scope (sk_namespace, global_namespace);
3464 current_lang_name = NULL_TREE;
3466 if (flag_visibility_ms_compat)
3467 default_visibility = VISIBILITY_HIDDEN;
3470 current_lang_name = lang_name_c;
3472 /* Create the `std' namespace. */
3473 push_namespace (std_identifier);
3474 std_node = current_namespace;
3477 c_common_nodes_and_builtins ();
3479 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
3480 java_short_type_node = record_builtin_java_type ("__java_short", 16);
3481 java_int_type_node = record_builtin_java_type ("__java_int", 32);
3482 java_long_type_node = record_builtin_java_type ("__java_long", 64);
3483 java_float_type_node = record_builtin_java_type ("__java_float", -32);
3484 java_double_type_node = record_builtin_java_type ("__java_double", -64);
3485 java_char_type_node = record_builtin_java_type ("__java_char", -16);
3486 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
3488 integer_two_node = build_int_cst (NULL_TREE, 2);
3490 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
3491 truthvalue_type_node = boolean_type_node;
3492 truthvalue_false_node = boolean_false_node;
3493 truthvalue_true_node = boolean_true_node;
3495 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
3496 noexcept_true_spec = build_tree_list (boolean_true_node, NULL_TREE);
3497 noexcept_false_spec = build_tree_list (boolean_false_node, NULL_TREE);
3500 record_builtin_type (RID_MAX, NULL, string_type_node);
3503 delta_type_node = ptrdiff_type_node;
3504 vtable_index_type = ptrdiff_type_node;
3506 vtt_parm_type = build_pointer_type (const_ptr_type_node);
3507 void_ftype = build_function_type_list (void_type_node, NULL_TREE);
3508 void_ftype_ptr = build_function_type_list (void_type_node,
3509 ptr_type_node, NULL_TREE);
3511 = build_exception_variant (void_ftype_ptr, empty_except_spec);
3513 /* C++ extensions */
3515 unknown_type_node = make_node (LANG_TYPE);
3516 record_unknown_type (unknown_type_node, "unknown type");
3518 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3519 TREE_TYPE (unknown_type_node) = unknown_type_node;
3521 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3523 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
3524 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
3526 init_list_type_node = make_node (LANG_TYPE);
3527 record_unknown_type (init_list_type_node, "init list");
3530 /* Make sure we get a unique function type, so we can give
3531 its pointer type a name. (This wins for gdb.) */
3532 tree vfunc_type = make_node (FUNCTION_TYPE);
3533 TREE_TYPE (vfunc_type) = integer_type_node;
3534 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
3535 layout_type (vfunc_type);
3537 vtable_entry_type = build_pointer_type (vfunc_type);
3539 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
3542 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
3543 layout_type (vtbl_type_node);
3544 vtbl_type_node = cp_build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
3545 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
3546 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
3547 layout_type (vtbl_ptr_type_node);
3548 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
3550 push_namespace (get_identifier ("__cxxabiv1"));
3551 abi_node = current_namespace;
3554 global_type_node = make_node (LANG_TYPE);
3555 record_unknown_type (global_type_node, "global type");
3558 current_lang_name = lang_name_cplusplus;
3561 tree newtype, deltype;
3562 tree ptr_ftype_sizetype;
3566 = build_function_type_list (ptr_type_node, size_type_node, NULL_TREE);
3567 if (cxx_dialect == cxx98)
3570 tree bad_alloc_type_node;
3571 tree bad_alloc_decl;
3573 push_namespace (std_identifier);
3574 bad_alloc_id = get_identifier ("bad_alloc");
3575 bad_alloc_type_node = make_class_type (RECORD_TYPE);
3576 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3578 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3579 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3583 = add_exception_specifier (NULL_TREE, bad_alloc_type_node, -1);
3586 new_eh_spec = noexcept_false_spec;
3588 newtype = build_exception_variant (ptr_ftype_sizetype, new_eh_spec);
3589 deltype = build_exception_variant (void_ftype_ptr, empty_except_spec);
3590 push_cp_library_fn (NEW_EXPR, newtype);
3591 push_cp_library_fn (VEC_NEW_EXPR, newtype);
3592 global_delete_fndecl = push_cp_library_fn (DELETE_EXPR, deltype);
3593 push_cp_library_fn (VEC_DELETE_EXPR, deltype);
3595 nullptr_type_node = make_node (NULLPTR_TYPE);
3596 TYPE_SIZE (nullptr_type_node) = bitsize_int (GET_MODE_BITSIZE (ptr_mode));
3597 TYPE_SIZE_UNIT (nullptr_type_node) = size_int (GET_MODE_SIZE (ptr_mode));
3598 TYPE_UNSIGNED (nullptr_type_node) = 1;
3599 TYPE_PRECISION (nullptr_type_node) = GET_MODE_BITSIZE (ptr_mode);
3600 SET_TYPE_MODE (nullptr_type_node, Pmode);
3601 record_builtin_type (RID_MAX, "decltype(nullptr)", nullptr_type_node);
3602 nullptr_node = build_int_cst (nullptr_type_node, 0);
3606 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype);
3608 /* Perform other language dependent initializations. */
3609 init_class_processing ();
3610 init_rtti_processing ();
3611 init_template_processing ();
3613 if (flag_exceptions)
3614 init_exception_processing ();
3616 if (! supports_one_only ())
3619 make_fname_decl = cp_make_fname_decl;
3620 start_fname_decls ();
3622 /* Show we use EH for cleanups. */
3623 if (flag_exceptions)
3624 using_eh_for_cleanups ();
3627 /* Generate an initializer for a function naming variable from
3628 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
3629 filled in with the type of the init. */
3632 cp_fname_init (const char* name, tree *type_p)
3634 tree domain = NULL_TREE;
3636 tree init = NULL_TREE;
3641 length = strlen (name);
3642 domain = build_index_type (size_int (length));
3643 init = build_string (length + 1, name);
3646 type = cp_build_qualified_type (char_type_node, TYPE_QUAL_CONST);
3647 type = build_cplus_array_type (type, domain);
3652 TREE_TYPE (init) = type;
3654 init = error_mark_node;
3659 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
3660 the decl, LOC is the location to give the decl, NAME is the
3661 initialization string and TYPE_DEP indicates whether NAME depended
3662 on the type of the function. We make use of that to detect
3663 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
3664 at the point of first use, so we mustn't push the decl now. */
3667 cp_make_fname_decl (location_t loc, tree id, int type_dep)
3669 const char *const name = (type_dep && processing_template_decl
3670 ? NULL : fname_as_string (type_dep));
3672 tree init = cp_fname_init (name, &type);
3673 tree decl = build_decl (loc, VAR_DECL, id, type);
3676 free (CONST_CAST (char *, name));
3678 /* As we're using pushdecl_with_scope, we must set the context. */
3679 DECL_CONTEXT (decl) = current_function_decl;
3680 DECL_PRETTY_FUNCTION_P (decl) = type_dep;
3682 TREE_STATIC (decl) = 1;
3683 TREE_READONLY (decl) = 1;
3684 DECL_ARTIFICIAL (decl) = 1;
3686 TREE_USED (decl) = 1;
3688 if (current_function_decl)
3690 struct cp_binding_level *b = current_binding_level;
3691 if (b->kind == sk_function_parms)
3692 return error_mark_node;
3693 while (b->level_chain->kind != sk_function_parms)
3695 pushdecl_with_scope (decl, b, /*is_friend=*/false);
3696 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, NULL_TREE,
3697 LOOKUP_ONLYCONVERTING);
3700 pushdecl_top_level_and_finish (decl, init);
3706 builtin_function_1 (tree decl, tree context, bool is_global)
3708 tree id = DECL_NAME (decl);
3709 const char *name = IDENTIFIER_POINTER (id);
3711 retrofit_lang_decl (decl);
3713 DECL_ARTIFICIAL (decl) = 1;
3714 SET_OVERLOADED_OPERATOR_CODE (decl, ERROR_MARK);
3715 SET_DECL_LANGUAGE (decl, lang_c);
3716 /* Runtime library routines are, by definition, available in an
3717 external shared object. */
3718 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
3719 DECL_VISIBILITY_SPECIFIED (decl) = 1;
3721 DECL_CONTEXT (decl) = context;
3724 pushdecl_top_level (decl);
3728 /* A function in the user's namespace should have an explicit
3729 declaration before it is used. Mark the built-in function as
3730 anticipated but not actually declared. */
3731 if (name[0] != '_' || name[1] != '_')
3732 DECL_ANTICIPATED (decl) = 1;
3733 else if (strncmp (name + 2, "builtin_", strlen ("builtin_")) != 0)
3735 size_t len = strlen (name);
3737 /* Treat __*_chk fortification functions as anticipated as well,
3738 unless they are __builtin_*. */
3739 if (len > strlen ("___chk")
3740 && memcmp (name + len - strlen ("_chk"),
3741 "_chk", strlen ("_chk") + 1) == 0)
3742 DECL_ANTICIPATED (decl) = 1;
3749 cxx_builtin_function (tree decl)
3751 tree id = DECL_NAME (decl);
3752 const char *name = IDENTIFIER_POINTER (id);
3753 /* All builtins that don't begin with an '_' should additionally
3754 go in the 'std' namespace. */
3757 tree decl2 = copy_node(decl);
3758 push_namespace (std_identifier);
3759 builtin_function_1 (decl2, std_node, false);
3763 return builtin_function_1 (decl, NULL_TREE, false);
3766 /* Like cxx_builtin_function, but guarantee the function is added to the global
3767 scope. This is to allow function specific options to add new machine
3768 dependent builtins when the target ISA changes via attribute((target(...)))
3769 which saves space on program startup if the program does not use non-generic
3773 cxx_builtin_function_ext_scope (tree decl)
3776 tree id = DECL_NAME (decl);
3777 const char *name = IDENTIFIER_POINTER (id);
3778 /* All builtins that don't begin with an '_' should additionally
3779 go in the 'std' namespace. */
3782 tree decl2 = copy_node(decl);
3783 push_namespace (std_identifier);
3784 builtin_function_1 (decl2, std_node, true);
3788 return builtin_function_1 (decl, NULL_TREE, true);
3791 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
3792 function. Not called directly. */
3795 build_library_fn_1 (tree name, enum tree_code operator_code, tree type)
3797 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
3798 DECL_EXTERNAL (fn) = 1;
3799 TREE_PUBLIC (fn) = 1;
3800 DECL_ARTIFICIAL (fn) = 1;
3801 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
3802 SET_DECL_LANGUAGE (fn, lang_c);
3803 /* Runtime library routines are, by definition, available in an
3804 external shared object. */
3805 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
3806 DECL_VISIBILITY_SPECIFIED (fn) = 1;
3810 /* Returns the _DECL for a library function with C linkage.
3811 We assume that such functions never throw; if this is incorrect,
3812 callers should unset TREE_NOTHROW. */
3815 build_library_fn (tree name, tree type)
3817 tree fn = build_library_fn_1 (name, ERROR_MARK, type);
3818 TREE_NOTHROW (fn) = 1;
3822 /* Returns the _DECL for a library function with C++ linkage. */
3825 build_cp_library_fn (tree name, enum tree_code operator_code, tree type)
3827 tree fn = build_library_fn_1 (name, operator_code, type);
3828 TREE_NOTHROW (fn) = TYPE_NOTHROW_P (type);
3829 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
3830 SET_DECL_LANGUAGE (fn, lang_cplusplus);
3834 /* Like build_library_fn, but takes a C string instead of an
3838 build_library_fn_ptr (const char* name, tree type)
3840 return build_library_fn (get_identifier (name), type);
3843 /* Like build_cp_library_fn, but takes a C string instead of an
3847 build_cp_library_fn_ptr (const char* name, tree type)
3849 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type);
3852 /* Like build_library_fn, but also pushes the function so that we will
3853 be able to find it via IDENTIFIER_GLOBAL_VALUE. Also, the function
3854 may throw exceptions listed in RAISES. */
3857 push_library_fn (tree name, tree type, tree raises)
3862 type = build_exception_variant (type, raises);
3864 fn = build_library_fn (name, type);
3865 pushdecl_top_level (fn);
3869 /* Like build_cp_library_fn, but also pushes the function so that it
3870 will be found by normal lookup. */
3873 push_cp_library_fn (enum tree_code operator_code, tree type)
3875 tree fn = build_cp_library_fn (ansi_opname (operator_code),
3882 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
3886 push_void_library_fn (tree name, tree parmtypes)
3888 tree type = build_function_type (void_type_node, parmtypes);
3889 return push_library_fn (name, type, NULL_TREE);
3892 /* Like push_library_fn, but also note that this function throws
3893 and does not return. Used for __throw_foo and the like. */
3896 push_throw_library_fn (tree name, tree type)
3898 tree fn = push_library_fn (name, type, NULL_TREE);
3899 TREE_THIS_VOLATILE (fn) = 1;
3900 TREE_NOTHROW (fn) = 0;
3904 /* When we call finish_struct for an anonymous union, we create
3905 default copy constructors and such. But, an anonymous union
3906 shouldn't have such things; this function undoes the damage to the
3907 anonymous union type T.
3909 (The reason that we create the synthesized methods is that we don't
3910 distinguish `union { int i; }' from `typedef union { int i; } U'.
3911 The first is an anonymous union; the second is just an ordinary
3915 fixup_anonymous_aggr (tree t)
3919 /* Wipe out memory of synthesized methods. */
3920 TYPE_HAS_USER_CONSTRUCTOR (t) = 0;
3921 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
3922 TYPE_HAS_COPY_CTOR (t) = 0;
3923 TYPE_HAS_CONST_COPY_CTOR (t) = 0;
3924 TYPE_HAS_COPY_ASSIGN (t) = 0;
3925 TYPE_HAS_CONST_COPY_ASSIGN (t) = 0;
3927 /* Splice the implicitly generated functions out of the TYPE_METHODS
3929 q = &TYPE_METHODS (t);
3932 if (DECL_ARTIFICIAL (*q))
3933 *q = TREE_CHAIN (*q);
3935 q = &DECL_CHAIN (*q);
3938 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
3939 if (TYPE_METHODS (t))
3941 tree decl = TYPE_MAIN_DECL (t);
3943 if (TREE_CODE (t) != UNION_TYPE)
3944 error_at (DECL_SOURCE_LOCATION (decl),
3945 "an anonymous struct cannot have function members");
3947 error_at (DECL_SOURCE_LOCATION (decl),
3948 "an anonymous union cannot have function members");
3951 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
3952 assignment operators (because they cannot have these methods themselves).
3953 For anonymous unions this is already checked because they are not allowed
3954 in any union, otherwise we have to check it. */
3955 if (TREE_CODE (t) != UNION_TYPE)
3959 for (field = TYPE_FIELDS (t); field; field = DECL_CHAIN (field))
3960 if (TREE_CODE (field) == FIELD_DECL)
3962 type = TREE_TYPE (field);
3963 if (CLASS_TYPE_P (type))
3965 if (TYPE_NEEDS_CONSTRUCTING (type))
3966 error ("member %q+#D with constructor not allowed "
3967 "in anonymous aggregate", field);
3968 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
3969 error ("member %q+#D with destructor not allowed "
3970 "in anonymous aggregate", field);
3971 if (TYPE_HAS_COMPLEX_COPY_ASSIGN (type))
3972 error ("member %q+#D with copy assignment operator "
3973 "not allowed in anonymous aggregate", field);
3979 /* Make sure that a declaration with no declarator is well-formed, i.e.
3980 just declares a tagged type or anonymous union.
3982 Returns the type declared; or NULL_TREE if none. */
3985 check_tag_decl (cp_decl_specifier_seq *declspecs)
3987 int saw_friend = declspecs->specs[(int)ds_friend] != 0;
3988 int saw_typedef = declspecs->specs[(int)ds_typedef] != 0;
3989 /* If a class, struct, or enum type is declared by the DECLSPECS
3990 (i.e, if a class-specifier, enum-specifier, or non-typename
3991 elaborated-type-specifier appears in the DECLSPECS),
3992 DECLARED_TYPE is set to the corresponding type. */
3993 tree declared_type = NULL_TREE;
3994 bool error_p = false;
3996 if (declspecs->multiple_types_p)
3997 error ("multiple types in one declaration");
3998 else if (declspecs->redefined_builtin_type)
4000 if (!in_system_header)
4001 permerror (input_location, "redeclaration of C++ built-in type %qT",
4002 declspecs->redefined_builtin_type);
4007 && TYPE_P (declspecs->type)
4008 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
4009 && MAYBE_CLASS_TYPE_P (declspecs->type))
4010 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
4011 declared_type = declspecs->type;
4012 else if (declspecs->type == error_mark_node)
4014 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
4015 permerror (input_location, "declaration does not declare anything");
4016 /* Check for an anonymous union. */
4017 else if (declared_type && RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type))
4018 && TYPE_ANONYMOUS_P (declared_type))
4020 /* 7/3 In a simple-declaration, the optional init-declarator-list
4021 can be omitted only when declaring a class (clause 9) or
4022 enumeration (7.2), that is, when the decl-specifier-seq contains
4023 either a class-specifier, an elaborated-type-specifier with
4024 a class-key (9.1), or an enum-specifier. In these cases and
4025 whenever a class-specifier or enum-specifier is present in the
4026 decl-specifier-seq, the identifiers in these specifiers are among
4027 the names being declared by the declaration (as class-name,
4028 enum-names, or enumerators, depending on the syntax). In such
4029 cases, and except for the declaration of an unnamed bit-field (9.6),
4030 the decl-specifier-seq shall introduce one or more names into the
4031 program, or shall redeclare a name introduced by a previous
4032 declaration. [Example:
4033 enum { }; // ill-formed
4034 typedef class { }; // ill-formed
4038 error ("missing type-name in typedef-declaration");
4041 /* Anonymous unions are objects, so they can have specifiers. */;
4042 SET_ANON_AGGR_TYPE_P (declared_type);
4044 if (TREE_CODE (declared_type) != UNION_TYPE && !in_system_header)
4045 pedwarn (input_location, OPT_pedantic, "ISO C++ prohibits anonymous structs");
4050 if (declspecs->specs[(int)ds_inline]
4051 || declspecs->specs[(int)ds_virtual])
4052 error ("%qs can only be specified for functions",
4053 declspecs->specs[(int)ds_inline]
4054 ? "inline" : "virtual");
4056 && (!current_class_type
4057 || current_scope () != current_class_type))
4058 error ("%<friend%> can only be specified inside a class");
4059 else if (declspecs->specs[(int)ds_explicit])
4060 error ("%<explicit%> can only be specified for constructors");
4061 else if (declspecs->storage_class)
4062 error ("a storage class can only be specified for objects "
4064 else if (declspecs->specs[(int)ds_const]
4065 || declspecs->specs[(int)ds_volatile]
4066 || declspecs->specs[(int)ds_restrict]
4067 || declspecs->specs[(int)ds_thread])
4068 error ("qualifiers can only be specified for objects "
4070 else if (saw_typedef)
4071 warning (0, "%<typedef%> was ignored in this declaration");
4072 else if (declspecs->specs[(int) ds_constexpr])
4073 error ("%<constexpr%> cannot be used for type declarations");
4076 return declared_type;
4079 /* Called when a declaration is seen that contains no names to declare.
4080 If its type is a reference to a structure, union or enum inherited
4081 from a containing scope, shadow that tag name for the current scope
4082 with a forward reference.
4083 If its type defines a new named structure or union
4084 or defines an enum, it is valid but we need not do anything here.
4085 Otherwise, it is an error.
4087 C++: may have to grok the declspecs to learn about static,
4088 complain for anonymous unions.
4090 Returns the TYPE declared -- or NULL_TREE if none. */
4093 shadow_tag (cp_decl_specifier_seq *declspecs)
4095 tree t = check_tag_decl (declspecs);
4100 if (declspecs->attributes)
4102 warning (0, "attribute ignored in declaration of %q+#T", t);
4103 warning (0, "attribute for %q+#T must follow the %qs keyword",
4104 t, class_key_or_enum_as_string (t));
4108 if (maybe_process_partial_specialization (t) == error_mark_node)
4111 /* This is where the variables in an anonymous union are
4112 declared. An anonymous union declaration looks like:
4114 because there is no declarator after the union, the parser
4115 sends that declaration here. */
4116 if (ANON_AGGR_TYPE_P (t))
4118 fixup_anonymous_aggr (t);
4120 if (TYPE_FIELDS (t))
4122 tree decl = grokdeclarator (/*declarator=*/NULL,
4123 declspecs, NORMAL, 0, NULL);
4124 finish_anon_union (decl);
4131 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4134 groktypename (cp_decl_specifier_seq *type_specifiers,
4135 const cp_declarator *declarator,
4136 bool is_template_arg)
4140 enum decl_context context
4141 = is_template_arg ? TEMPLATE_TYPE_ARG : TYPENAME;
4142 attrs = type_specifiers->attributes;
4143 type_specifiers->attributes = NULL_TREE;
4144 type = grokdeclarator (declarator, type_specifiers, context, 0, &attrs);
4145 if (attrs && type != error_mark_node)
4147 if (CLASS_TYPE_P (type))
4148 warning (OPT_Wattributes, "ignoring attributes applied to class type %qT "
4149 "outside of definition", type);
4150 else if (MAYBE_CLASS_TYPE_P (type))
4151 /* A template type parameter or other dependent type. */
4152 warning (OPT_Wattributes, "ignoring attributes applied to dependent "
4153 "type %qT without an associated declaration", type);
4155 cplus_decl_attributes (&type, attrs, 0);
4160 /* Process a DECLARATOR for a function-scope variable declaration,
4161 namespace-scope variable declaration, or function declaration.
4162 (Function definitions go through start_function; class member
4163 declarations appearing in the body of the class go through
4164 grokfield.) The DECL corresponding to the DECLARATOR is returned.
4165 If an error occurs, the error_mark_node is returned instead.
4167 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
4168 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
4169 for an explicitly defaulted function, or SD_DELETED for an explicitly
4170 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
4171 implicitly initialized via a default constructor. ATTRIBUTES and
4172 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
4173 *PUSHED_SCOPE_P is set to the scope entered in this function, if any; if
4174 set, the caller is responsible for calling pop_scope. */
4177 start_decl (const cp_declarator *declarator,
4178 cp_decl_specifier_seq *declspecs,
4181 tree prefix_attributes,
4182 tree *pushed_scope_p)
4190 *pushed_scope_p = NULL_TREE;
4192 /* An object declared as __attribute__((deprecated)) suppresses
4193 warnings of uses of other deprecated items. */
4194 if (lookup_attribute ("deprecated", attributes))
4195 deprecated_state = DEPRECATED_SUPPRESS;
4197 attributes = chainon (attributes, prefix_attributes);
4199 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
4202 deprecated_state = DEPRECATED_NORMAL;
4204 if (decl == NULL_TREE || TREE_CODE (decl) == VOID_TYPE
4205 || decl == error_mark_node)
4206 return error_mark_node;
4208 context = CP_DECL_CONTEXT (decl);
4209 if (context != global_namespace)
4210 *pushed_scope_p = push_scope (context);
4213 /* Is it valid for this decl to have an initializer at all?
4214 If not, set INITIALIZED to zero, which will indirectly
4215 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4216 switch (TREE_CODE (decl))
4219 error ("typedef %qD is initialized (use decltype instead)", decl);
4220 return error_mark_node;
4223 if (initialized == SD_DELETED)
4224 /* We'll handle the rest of the semantics later, but we need to
4225 set this now so it's visible to duplicate_decls. */
4226 DECL_DELETED_FN (decl) = 1;
4235 if (! toplevel_bindings_p ()
4236 && DECL_EXTERNAL (decl))
4237 warning (0, "declaration of %q#D has %<extern%> and is initialized",
4239 DECL_EXTERNAL (decl) = 0;
4240 if (toplevel_bindings_p ())
4241 TREE_STATIC (decl) = 1;
4243 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl)) != 0;
4245 if (alias && TREE_CODE (decl) == FUNCTION_DECL)
4246 record_key_method_defined (decl);
4248 /* If this is a typedef that names the class for linkage purposes
4249 (7.1.3p8), apply any attributes directly to the type. */
4250 if (TREE_CODE (decl) == TYPE_DECL
4251 && TAGGED_TYPE_P (TREE_TYPE (decl))
4252 && decl == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl))))
4253 flags = ATTR_FLAG_TYPE_IN_PLACE;
4257 /* Set attributes here so if duplicate decl, will have proper attributes. */
4258 cplus_decl_attributes (&decl, attributes, flags);
4260 /* Dllimported symbols cannot be defined. Static data members (which
4261 can be initialized in-class and dllimported) go through grokfield,
4262 not here, so we don't need to exclude those decls when checking for
4264 if (initialized && DECL_DLLIMPORT_P (decl))
4266 error ("definition of %q#D is marked %<dllimport%>", decl);
4267 DECL_DLLIMPORT_P (decl) = 0;
4270 /* If #pragma weak was used, mark the decl weak now. */
4271 maybe_apply_pragma_weak (decl);
4273 if (TREE_CODE (decl) == FUNCTION_DECL
4274 && DECL_DECLARED_INLINE_P (decl)
4275 && DECL_UNINLINABLE (decl)
4276 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4277 warning (0, "inline function %q+D given attribute noinline", decl);
4279 if (TYPE_P (context) && COMPLETE_TYPE_P (complete_type (context)))
4281 if (TREE_CODE (decl) == VAR_DECL)
4283 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
4284 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
4285 error ("%q#D is not a static member of %q#T", decl, context);
4288 if (DECL_CONTEXT (field) != context)
4290 if (!same_type_p (DECL_CONTEXT (field), context))
4291 permerror (input_location, "ISO C++ does not permit %<%T::%D%> "
4292 "to be defined as %<%T::%D%>",
4293 DECL_CONTEXT (field), DECL_NAME (decl),
4294 context, DECL_NAME (decl));
4295 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
4297 if (processing_specialization
4298 && template_class_depth (context) == 0
4299 && CLASSTYPE_TEMPLATE_SPECIALIZATION (context))
4300 error ("template header not allowed in member definition "
4301 "of explicitly specialized class");
4302 /* Static data member are tricky; an in-class initialization
4303 still doesn't provide a definition, so the in-class
4304 declaration will have DECL_EXTERNAL set, but will have an
4305 initialization. Thus, duplicate_decls won't warn
4306 about this situation, and so we check here. */
4307 if (initialized && DECL_INITIALIZED_IN_CLASS_P (field))
4308 error ("duplicate initialization of %qD", decl);
4309 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
4311 if (declspecs->specs[(int) ds_constexpr]
4312 && !DECL_DECLARED_CONSTEXPR_P (field))
4313 error ("%qD declared %<constexpr%> outside its class", field);
4318 tree field = check_classfn (context, decl,
4319 (processing_template_decl
4320 > template_class_depth (context))
4321 ? current_template_parms
4323 if (field && field != error_mark_node
4324 && duplicate_decls (decl, field,
4325 /*newdecl_is_friend=*/false))
4329 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
4330 DECL_IN_AGGR_P (decl) = 0;
4331 /* Do not mark DECL as an explicit specialization if it was not
4332 already marked as an instantiation; a declaration should
4333 never be marked as a specialization unless we know what
4334 template is being specialized. */
4335 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
4337 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
4339 /* [temp.expl.spec] An explicit specialization of a static data
4340 member of a template is a definition if the declaration
4341 includes an initializer; otherwise, it is a declaration.
4343 We check for processing_specialization so this only applies
4344 to the new specialization syntax. */
4345 if (!initialized && processing_specialization)
4346 DECL_EXTERNAL (decl) = 1;
4349 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl)
4350 /* Aliases are definitions. */
4352 permerror (input_location, "declaration of %q#D outside of class is not definition",
4356 was_public = TREE_PUBLIC (decl);
4358 /* Enter this declaration into the symbol table. */
4359 decl = maybe_push_decl (decl);
4361 if (processing_template_decl)
4362 decl = push_template_decl (decl);
4363 if (decl == error_mark_node)
4364 return error_mark_node;
4366 /* Tell the back end to use or not use .common as appropriate. If we say
4367 -fconserve-space, we want this to save .data space, at the expense of
4368 wrong semantics. If we say -fno-conserve-space, we want this to
4369 produce errors about redefs; to do this we force variables into the
4371 if (flag_conserve_space
4372 && TREE_CODE (decl) == VAR_DECL
4373 && TREE_PUBLIC (decl)
4374 && !DECL_THREAD_LOCAL_P (decl)
4375 && !have_global_bss_p ())
4376 DECL_COMMON (decl) = 1;
4378 if (TREE_CODE (decl) == VAR_DECL
4379 && DECL_NAMESPACE_SCOPE_P (decl) && !TREE_PUBLIC (decl) && !was_public
4380 && !DECL_THIS_STATIC (decl) && !DECL_ARTIFICIAL (decl))
4382 /* This is a const variable with implicit 'static'. Set
4383 DECL_THIS_STATIC so we can tell it from variables that are
4384 !TREE_PUBLIC because of the anonymous namespace. */
4385 gcc_assert (CP_TYPE_CONST_P (TREE_TYPE (decl)) || errorcount);
4386 DECL_THIS_STATIC (decl) = 1;
4389 if (!processing_template_decl && TREE_CODE (decl) == VAR_DECL)
4390 start_decl_1 (decl, initialized);
4395 /* Process the declaration of a variable DECL. INITIALIZED is true
4396 iff DECL is explicitly initialized. (INITIALIZED is false if the
4397 variable is initialized via an implicitly-called constructor.)
4398 This function must be called for ordinary variables (including, for
4399 example, implicit instantiations of templates), but must not be
4400 called for template declarations. */
4403 start_decl_1 (tree decl, bool initialized)
4407 bool aggregate_definition_p;
4409 gcc_assert (!processing_template_decl);
4411 if (error_operand_p (decl))
4414 gcc_assert (TREE_CODE (decl) == VAR_DECL);
4416 type = TREE_TYPE (decl);
4417 complete_p = COMPLETE_TYPE_P (type);
4418 aggregate_definition_p = MAYBE_CLASS_TYPE_P (type) && !DECL_EXTERNAL (decl);
4420 /* If an explicit initializer is present, or if this is a definition
4421 of an aggregate, then we need a complete type at this point.
4422 (Scalars are always complete types, so there is nothing to
4423 check.) This code just sets COMPLETE_P; errors (if necessary)
4424 are issued below. */
4425 if ((initialized || aggregate_definition_p)
4427 && COMPLETE_TYPE_P (complete_type (type)))
4430 /* We will not yet have set TREE_READONLY on DECL if the type
4431 was "const", but incomplete, before this point. But, now, we
4432 have a complete type, so we can try again. */
4433 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
4437 /* Is it valid for this decl to have an initializer at all? */
4439 /* Don't allow initializations for incomplete types except for
4440 arrays which might be completed by the initialization. */
4442 ; /* A complete type is ok. */
4443 else if (type_uses_auto (type))
4444 ; /* An auto type is ok. */
4445 else if (TREE_CODE (type) != ARRAY_TYPE)
4447 error ("variable %q#D has initializer but incomplete type", decl);
4448 type = TREE_TYPE (decl) = error_mark_node;
4450 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4452 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
4453 error ("elements of array %q#D have incomplete type", decl);
4454 /* else we already gave an error in start_decl. */
4457 else if (aggregate_definition_p && !complete_p)
4459 if (type_uses_auto (type))
4460 error ("declaration of %q#D has no initializer", decl);
4462 error ("aggregate %q#D has incomplete type and cannot be defined",
4464 /* Change the type so that assemble_variable will give
4465 DECL an rtl we can live with: (mem (const_int 0)). */
4466 type = TREE_TYPE (decl) = error_mark_node;
4469 /* Create a new scope to hold this declaration if necessary.
4470 Whether or not a new scope is necessary cannot be determined
4471 until after the type has been completed; if the type is a
4472 specialization of a class template it is not until after
4473 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
4474 will be set correctly. */
4475 maybe_push_cleanup_level (type);
4478 /* Handle initialization of references. DECL, TYPE, and INIT have the
4479 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
4480 but will be set to a new CLEANUP_STMT if a temporary is created
4481 that must be destroyed subsequently.
4483 Returns an initializer expression to use to initialize DECL, or
4484 NULL if the initialization can be performed statically.
4486 Quotes on semantics can be found in ARM 8.4.3. */
4489 grok_reference_init (tree decl, tree type, tree init, tree *cleanup)
4493 if (init == NULL_TREE)
4495 if ((DECL_LANG_SPECIFIC (decl) == 0
4496 || DECL_IN_AGGR_P (decl) == 0)
4497 && ! DECL_THIS_EXTERN (decl))
4498 error ("%qD declared as reference but not initialized", decl);
4502 if (TREE_CODE (init) == TREE_LIST)
4503 init = build_x_compound_expr_from_list (init, ELK_INIT,
4504 tf_warning_or_error);
4506 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
4507 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
4508 /* Note: default conversion is only called in very special cases. */
4509 init = decay_conversion (init);
4511 /* Convert INIT to the reference type TYPE. This may involve the
4512 creation of a temporary, whose lifetime must be the same as that
4513 of the reference. If so, a DECL_EXPR for the temporary will be
4514 added just after the DECL_EXPR for DECL. That's why we don't set
4515 DECL_INITIAL for local references (instead assigning to them
4516 explicitly); we need to allow the temporary to be initialized
4518 tmp = initialize_reference (type, init, decl, cleanup, tf_warning_or_error);
4520 if (tmp == error_mark_node)
4522 else if (tmp == NULL_TREE)
4524 error ("cannot initialize %qT from %qT", type, TREE_TYPE (init));
4528 if (TREE_STATIC (decl) && !TREE_CONSTANT (tmp))
4531 DECL_INITIAL (decl) = tmp;
4536 /* Subroutine of check_initializer. We're initializing a DECL of
4537 std::initializer_list<T> TYPE from a braced-init-list INIT, and need to
4538 extend the lifetime of the underlying array to match that of the decl,
4539 just like for reference initialization. CLEANUP is as for
4540 grok_reference_init. */
4543 build_init_list_var_init (tree decl, tree type, tree init, tree *array_init,
4546 tree aggr_init, array, arrtype;
4547 init = perform_implicit_conversion (type, init, tf_warning_or_error);
4548 if (error_operand_p (init))
4549 return error_mark_node;
4551 aggr_init = TARGET_EXPR_INITIAL (init);
4552 array = AGGR_INIT_EXPR_ARG (aggr_init, 1);
4553 arrtype = TREE_TYPE (array);
4555 gcc_assert (TREE_CODE (array) == ADDR_EXPR);
4556 array = TREE_OPERAND (array, 0);
4557 /* If the array is constant, finish_compound_literal already made it a
4558 static variable and we don't need to do anything here. */
4559 if (decl && TREE_CODE (array) == TARGET_EXPR)
4561 tree var = set_up_extended_ref_temp (decl, array, cleanup, array_init);
4562 var = build_address (var);
4563 var = convert (arrtype, var);
4564 AGGR_INIT_EXPR_ARG (aggr_init, 1) = var;
4569 /* Designated initializers in arrays are not supported in GNU C++.
4570 The parser cannot detect this error since it does not know whether
4571 a given brace-enclosed initializer is for a class type or for an
4572 array. This function checks that CE does not use a designated
4573 initializer. If it does, an error is issued. Returns true if CE
4574 is valid, i.e., does not have a designated initializer. */
4577 check_array_designated_initializer (const constructor_elt *ce)
4579 /* Designated initializers for array elements are not supported. */
4582 /* The parser only allows identifiers as designated
4584 if (ce->index == error_mark_node)
4585 error ("name used in a GNU-style designated "
4586 "initializer for an array");
4589 gcc_assert (TREE_CODE (ce->index) == IDENTIFIER_NODE);
4590 error ("name %qD used in a GNU-style designated "
4591 "initializer for an array", ce->index);
4599 /* When parsing `int a[] = {1, 2};' we don't know the size of the
4600 array until we finish parsing the initializer. If that's the
4601 situation we're in, update DECL accordingly. */
4604 maybe_deduce_size_from_array_init (tree decl, tree init)
4606 tree type = TREE_TYPE (decl);
4608 if (TREE_CODE (type) == ARRAY_TYPE
4609 && TYPE_DOMAIN (type) == NULL_TREE
4610 && TREE_CODE (decl) != TYPE_DECL)
4612 /* do_default is really a C-ism to deal with tentative definitions.
4613 But let's leave it here to ease the eventual merge. */
4614 int do_default = !DECL_EXTERNAL (decl);
4615 tree initializer = init ? init : DECL_INITIAL (decl);
4618 /* Check that there are no designated initializers in INIT, as
4619 those are not supported in GNU C++, and as the middle-end
4620 will crash if presented with a non-numeric designated
4622 if (initializer && TREE_CODE (initializer) == CONSTRUCTOR)
4624 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initializer);
4625 constructor_elt *ce;
4627 FOR_EACH_VEC_ELT (constructor_elt, v, i, ce)
4628 if (!check_array_designated_initializer (ce))
4634 failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
4638 error ("initializer fails to determine size of %qD", decl);
4639 TREE_TYPE (decl) = error_mark_node;
4641 else if (failure == 2)
4645 error ("array size missing in %qD", decl);
4646 TREE_TYPE (decl) = error_mark_node;
4648 /* If a `static' var's size isn't known, make it extern as
4649 well as static, so it does not get allocated. If it's not
4650 `static', then don't mark it extern; finish_incomplete_decl
4651 will give it a default size and it will get allocated. */
4652 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4653 DECL_EXTERNAL (decl) = 1;
4655 else if (failure == 3)
4657 error ("zero-size array %qD", decl);
4658 TREE_TYPE (decl) = error_mark_node;
4662 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
4664 relayout_decl (decl);
4668 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
4669 any appropriate error messages regarding the layout. */
4672 layout_var_decl (tree decl)
4676 type = TREE_TYPE (decl);
4677 if (type == error_mark_node)
4680 /* If we haven't already layed out this declaration, do so now.
4681 Note that we must not call complete type for an external object
4682 because it's type might involve templates that we are not
4683 supposed to instantiate yet. (And it's perfectly valid to say
4684 `extern X x' for some incomplete type `X'.) */
4685 if (!DECL_EXTERNAL (decl))
4686 complete_type (type);
4687 if (!DECL_SIZE (decl)
4688 && TREE_TYPE (decl) != error_mark_node
4689 && (COMPLETE_TYPE_P (type)
4690 || (TREE_CODE (type) == ARRAY_TYPE
4691 && !TYPE_DOMAIN (type)
4692 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
4693 layout_decl (decl, 0);
4695 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
4697 /* An automatic variable with an incomplete type: that is an error.
4698 Don't talk about array types here, since we took care of that
4699 message in grokdeclarator. */
4700 error ("storage size of %qD isn%'t known", decl);
4701 TREE_TYPE (decl) = error_mark_node;
4704 /* Keep this code around in case we later want to control debug info
4705 based on whether a type is "used". (jason 1999-11-11) */
4707 else if (!DECL_EXTERNAL (decl) && MAYBE_CLASS_TYPE_P (ttype))
4708 /* Let debugger know it should output info for this type. */
4709 note_debug_info_needed (ttype);
4711 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4712 note_debug_info_needed (DECL_CONTEXT (decl));
4715 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4716 && DECL_SIZE (decl) != NULL_TREE
4717 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4719 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4720 constant_expression_warning (DECL_SIZE (decl));
4723 error ("storage size of %qD isn%'t constant", decl);
4724 TREE_TYPE (decl) = error_mark_node;
4729 /* If a local static variable is declared in an inline function, or if
4730 we have a weak definition, we must endeavor to create only one
4731 instance of the variable at link-time. */
4734 maybe_commonize_var (tree decl)
4736 /* Static data in a function with comdat linkage also has comdat
4738 if (TREE_STATIC (decl)
4739 /* Don't mess with __FUNCTION__. */
4740 && ! DECL_ARTIFICIAL (decl)
4741 && DECL_FUNCTION_SCOPE_P (decl)
4742 && vague_linkage_p (DECL_CONTEXT (decl)))
4746 /* With weak symbols, we simply make the variable COMDAT;
4747 that will cause copies in multiple translations units to
4749 comdat_linkage (decl);
4753 if (DECL_INITIAL (decl) == NULL_TREE
4754 || DECL_INITIAL (decl) == error_mark_node)
4756 /* Without weak symbols, we can use COMMON to merge
4757 uninitialized variables. */
4758 TREE_PUBLIC (decl) = 1;
4759 DECL_COMMON (decl) = 1;
4763 /* While for initialized variables, we must use internal
4764 linkage -- which means that multiple copies will not
4766 TREE_PUBLIC (decl) = 0;
4767 DECL_COMMON (decl) = 0;
4768 warning_at (input_location, 0,
4769 "sorry: semantics of inline function static "
4770 "data %q+#D are wrong (you%'ll wind up "
4771 "with multiple copies)", decl);
4772 warning_at (DECL_SOURCE_LOCATION (decl), 0,
4773 " you can work around this by removing "
4778 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4779 /* Set it up again; we might have set DECL_INITIAL since the last
4781 comdat_linkage (decl);
4784 /* Issue an error message if DECL is an uninitialized const variable. */
4787 check_for_uninitialized_const_var (tree decl)
4789 tree type = strip_array_types (TREE_TYPE (decl));
4791 /* ``Unless explicitly declared extern, a const object does not have
4792 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4794 if (TREE_CODE (decl) == VAR_DECL
4795 && TREE_CODE (type) != REFERENCE_TYPE
4796 && CP_TYPE_CONST_P (type)
4797 && (!TYPE_NEEDS_CONSTRUCTING (type)
4798 || !type_has_user_provided_default_constructor (type))
4799 && !DECL_INITIAL (decl))
4801 permerror (DECL_SOURCE_LOCATION (decl),
4802 "uninitialized const %qD", decl);
4804 if (CLASS_TYPE_P (type)
4805 && !type_has_user_provided_default_constructor (type))
4807 tree defaulted_ctor;
4809 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (type)),
4810 "%q#T has no user-provided default constructor", type);
4811 defaulted_ctor = in_class_defaulted_default_constructor (type);
4813 inform (DECL_SOURCE_LOCATION (defaulted_ctor),
4814 "constructor is not user-provided because it is "
4815 "explicitly defaulted in the class body");
4820 /* Structure holding the current initializer being processed by reshape_init.
4821 CUR is a pointer to the current element being processed, END is a pointer
4822 after the last element present in the initializer. */
4823 typedef struct reshape_iterator_t
4825 constructor_elt *cur;
4826 constructor_elt *end;
4829 static tree reshape_init_r (tree, reshape_iter *, bool);
4831 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4832 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4833 initialized. If there are no more such fields, the return value
4837 next_initializable_field (tree field)
4840 && (TREE_CODE (field) != FIELD_DECL
4841 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4842 || DECL_ARTIFICIAL (field)))
4843 field = DECL_CHAIN (field);
4848 /* Subroutine of reshape_init_array and reshape_init_vector, which does
4849 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
4850 INTEGER_CST representing the size of the array minus one (the maximum index),
4851 or NULL_TREE if the array was declared without specifying the size. D is
4852 the iterator within the constructor. */
4855 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d)
4858 bool sized_array_p = (max_index != NULL_TREE);
4859 unsigned HOST_WIDE_INT max_index_cst = 0;
4860 unsigned HOST_WIDE_INT index;
4862 /* The initializer for an array is always a CONSTRUCTOR. */
4863 new_init = build_constructor (init_list_type_node, NULL);
4867 /* Minus 1 is used for zero sized arrays. */
4868 if (integer_all_onesp (max_index))
4871 if (host_integerp (max_index, 1))
4872 max_index_cst = tree_low_cst (max_index, 1);
4873 /* sizetype is sign extended, not zero extended. */
4875 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
4879 /* Loop until there are no more initializers. */
4881 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
4886 check_array_designated_initializer (d->cur);
4887 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false);
4888 if (elt_init == error_mark_node)
4889 return error_mark_node;
4890 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), NULL_TREE, elt_init);
4896 /* Subroutine of reshape_init_r, processes the initializers for arrays.
4897 Parameters are the same of reshape_init_r. */
4900 reshape_init_array (tree type, reshape_iter *d)
4902 tree max_index = NULL_TREE;
4904 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
4906 if (TYPE_DOMAIN (type))
4907 max_index = array_type_nelts (type);
4909 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4912 /* Subroutine of reshape_init_r, processes the initializers for vectors.
4913 Parameters are the same of reshape_init_r. */
4916 reshape_init_vector (tree type, reshape_iter *d)
4918 tree max_index = NULL_TREE;
4920 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
4922 if (COMPOUND_LITERAL_P (d->cur->value))
4924 tree value = d->cur->value;
4925 if (!same_type_p (TREE_TYPE (value), type))
4927 error ("invalid type %qT as initializer for a vector of type %qT",
4928 TREE_TYPE (d->cur->value), type);
4929 value = error_mark_node;
4935 /* For a vector, we initialize it as an array of the appropriate size. */
4936 if (TREE_CODE (type) == VECTOR_TYPE)
4937 max_index = size_int (TYPE_VECTOR_SUBPARTS (type) - 1);
4939 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4942 /* Subroutine of reshape_init_r, processes the initializers for classes
4943 or union. Parameters are the same of reshape_init_r. */
4946 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p)
4951 gcc_assert (CLASS_TYPE_P (type));
4953 /* The initializer for a class is always a CONSTRUCTOR. */
4954 new_init = build_constructor (init_list_type_node, NULL);
4955 field = next_initializable_field (TYPE_FIELDS (type));
4961 An initializer for an aggregate member that is an
4962 empty class shall have the form of an empty
4963 initializer-list {}. */
4964 if (!first_initializer_p)
4966 error ("initializer for %qT must be brace-enclosed", type);
4967 return error_mark_node;
4972 /* Loop through the initializable fields, gathering initializers. */
4973 while (d->cur != d->end)
4977 /* Handle designated initializers, as an extension. */
4980 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
4982 if (!field || TREE_CODE (field) != FIELD_DECL)
4984 error ("%qT has no non-static data member named %qD", type,
4986 return error_mark_node;
4990 /* If we processed all the member of the class, we are done. */
4994 field_init = reshape_init_r (TREE_TYPE (field), d,
4995 /*first_initializer_p=*/false);
4996 if (field_init == error_mark_node)
4997 return error_mark_node;
4999 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
5003 When a union is initialized with a brace-enclosed
5004 initializer, the braces shall only contain an
5005 initializer for the first member of the union. */
5006 if (TREE_CODE (type) == UNION_TYPE)
5009 field = next_initializable_field (DECL_CHAIN (field));
5015 /* Subroutine of reshape_init, which processes a single initializer (part of
5016 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
5017 iterator within the CONSTRUCTOR which points to the initializer to process.
5018 FIRST_INITIALIZER_P is true if this is the first initializer of the
5019 outermost CONSTRUCTOR node. */
5022 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p)
5024 tree init = d->cur->value;
5026 if (error_operand_p (init))
5027 return error_mark_node;
5029 /* A non-aggregate type is always initialized with a single
5031 if (!CP_AGGREGATE_TYPE_P (type))
5033 /* It is invalid to initialize a non-aggregate type with a
5034 brace-enclosed initializer before C++0x.
5035 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
5036 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
5037 a CONSTRUCTOR (with a record type). */
5038 if (TREE_CODE (init) == CONSTRUCTOR
5039 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
5041 if (SCALAR_TYPE_P (type))
5043 error ("braces around scalar initializer for type %qT", type);
5044 init = error_mark_node;
5047 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5056 All implicit type conversions (clause _conv_) are considered when
5057 initializing the aggregate member with an initializer from an
5058 initializer-list. If the initializer can initialize a member,
5059 the member is initialized. Otherwise, if the member is itself a
5060 non-empty subaggregate, brace elision is assumed and the
5061 initializer is considered for the initialization of the first
5062 member of the subaggregate. */
5063 if (TREE_CODE (init) != CONSTRUCTOR
5064 /* But don't try this for the first initializer, since that would be
5065 looking through the outermost braces; A a2 = { a1 }; is not a
5066 valid aggregate initialization. */
5067 && !first_initializer_p
5068 && (same_type_ignoring_top_level_qualifiers_p (type, TREE_TYPE (init))
5069 || can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL)))
5075 /* [dcl.init.string]
5077 A char array (whether plain char, signed char, or unsigned char)
5078 can be initialized by a string-literal (optionally enclosed in
5079 braces); a wchar_t array can be initialized by a wide
5080 string-literal (optionally enclosed in braces). */
5081 if (TREE_CODE (type) == ARRAY_TYPE
5082 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
5084 tree str_init = init;
5086 /* Strip one level of braces if and only if they enclose a single
5087 element (as allowed by [dcl.init.string]). */
5088 if (!first_initializer_p
5089 && TREE_CODE (str_init) == CONSTRUCTOR
5090 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (str_init)) == 1)
5092 str_init = VEC_index (constructor_elt,
5093 CONSTRUCTOR_ELTS (str_init), 0)->value;
5096 /* If it's a string literal, then it's the initializer for the array
5097 as a whole. Otherwise, continue with normal initialization for
5098 array types (one value per array element). */
5099 if (TREE_CODE (str_init) == STRING_CST)
5106 /* The following cases are about aggregates. If we are not within a full
5107 initializer already, and there is not a CONSTRUCTOR, it means that there
5108 is a missing set of braces (that is, we are processing the case for
5109 which reshape_init exists). */
5110 if (!first_initializer_p)
5112 if (TREE_CODE (init) == CONSTRUCTOR)
5114 if (TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init)))
5115 /* There is no need to reshape pointer-to-member function
5116 initializers, as they are always constructed correctly
5117 by the front end. */
5119 else if (COMPOUND_LITERAL_P (init))
5120 /* For a nested compound literal, there is no need to reshape since
5121 brace elision is not allowed. Even if we decided to allow it,
5122 we should add a call to reshape_init in finish_compound_literal,
5123 before calling digest_init, so changing this code would still
5124 not be necessary. */
5125 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
5129 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5130 return reshape_init (type, init);
5134 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
5138 /* Dispatch to specialized routines. */
5139 if (CLASS_TYPE_P (type))
5140 return reshape_init_class (type, d, first_initializer_p);
5141 else if (TREE_CODE (type) == ARRAY_TYPE)
5142 return reshape_init_array (type, d);
5143 else if (TREE_CODE (type) == VECTOR_TYPE)
5144 return reshape_init_vector (type, d);
5149 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
5150 brace-enclosed aggregate initializer.
5152 INIT is the CONSTRUCTOR containing the list of initializers describing
5153 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
5154 It may not presently match the shape of the TYPE; for example:
5156 struct S { int a; int b; };
5157 struct S a[] = { 1, 2, 3, 4 };
5159 Here INIT will hold a VEC of four elements, rather than a
5160 VEC of two elements, each itself a VEC of two elements. This
5161 routine transforms INIT from the former form into the latter. The
5162 revised CONSTRUCTOR node is returned. */
5165 reshape_init (tree type, tree init)
5167 VEC(constructor_elt, gc) *v;
5171 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5173 v = CONSTRUCTOR_ELTS (init);
5175 /* An empty constructor does not need reshaping, and it is always a valid
5177 if (VEC_empty (constructor_elt, v))
5180 /* Recurse on this CONSTRUCTOR. */
5181 d.cur = VEC_index (constructor_elt, v, 0);
5182 d.end = d.cur + VEC_length (constructor_elt, v);
5184 new_init = reshape_init_r (type, &d, true);
5185 if (new_init == error_mark_node)
5186 return error_mark_node;
5188 /* Make sure all the element of the constructor were used. Otherwise,
5189 issue an error about exceeding initializers. */
5191 error ("too many initializers for %qT", type);
5196 /* Verify array initializer. Returns true if errors have been reported. */
5199 check_array_initializer (tree decl, tree type, tree init)
5201 tree element_type = TREE_TYPE (type);
5203 /* The array type itself need not be complete, because the
5204 initializer may tell us how many elements are in the array.
5205 But, the elements of the array must be complete. */
5206 if (!COMPLETE_TYPE_P (complete_type (element_type)))
5209 error ("elements of array %q#D have incomplete type", decl);
5211 error ("elements of array %q#T have incomplete type", type);
5214 /* It is not valid to initialize a VLA. */
5216 && ((COMPLETE_TYPE_P (type) && !TREE_CONSTANT (TYPE_SIZE (type)))
5217 || !TREE_CONSTANT (TYPE_SIZE (element_type))))
5220 error ("variable-sized object %qD may not be initialized", decl);
5222 error ("variable-sized compound literal");
5228 /* Subroutine of check_initializer; args are passed down from that function.
5229 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
5232 build_aggr_init_full_exprs (tree decl, tree init, int flags)
5235 int saved_stmts_are_full_exprs_p = 0;
5236 if (building_stmt_tree ())
5238 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5239 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5241 init = build_aggr_init (decl, init, flags, tf_warning_or_error);
5242 if (building_stmt_tree ())
5243 current_stmt_tree ()->stmts_are_full_exprs_p =
5244 saved_stmts_are_full_exprs_p;
5248 /* Verify INIT (the initializer for DECL), and record the
5249 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
5250 grok_reference_init.
5252 If the return value is non-NULL, it is an expression that must be
5253 evaluated dynamically to initialize DECL. */
5256 check_initializer (tree decl, tree init, int flags, tree *cleanup)
5258 tree type = TREE_TYPE (decl);
5259 tree init_code = NULL;
5260 tree extra_init = NULL_TREE;
5263 /* Things that are going to be initialized need to have complete
5265 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
5267 if (type == error_mark_node)
5268 /* We will have already complained. */
5271 if (TREE_CODE (type) == ARRAY_TYPE)
5273 if (check_array_initializer (decl, type, init))
5276 else if (!COMPLETE_TYPE_P (type))
5278 error ("%qD has incomplete type", decl);
5279 TREE_TYPE (decl) = error_mark_node;
5283 /* There is no way to make a variable-sized class type in GNU C++. */
5284 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
5286 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5288 int init_len = VEC_length (constructor_elt, CONSTRUCTOR_ELTS (init));
5289 if (SCALAR_TYPE_P (type))
5293 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5294 init = build_zero_init (type, NULL_TREE, false);
5296 else if (init_len != 1)
5298 error ("scalar object %qD requires one element in initializer",
5300 TREE_TYPE (decl) = error_mark_node;
5306 if (TREE_CODE (decl) == CONST_DECL)
5308 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
5310 DECL_INITIAL (decl) = init;
5312 gcc_assert (init != NULL_TREE);
5315 else if (!init && DECL_REALLY_EXTERN (decl))
5317 else if (TREE_CODE (type) == REFERENCE_TYPE)
5318 init = grok_reference_init (decl, type, init, cleanup);
5319 else if (init || TYPE_NEEDS_CONSTRUCTING (type))
5322 check_for_uninitialized_const_var (decl);
5323 /* Do not reshape constructors of vectors (they don't need to be
5325 else if (BRACE_ENCLOSED_INITIALIZER_P (init))
5327 if (is_std_init_list (type))
5328 init = build_init_list_var_init (decl, type, init,
5329 &extra_init, cleanup);
5330 else if (TYPE_NON_AGGREGATE_CLASS (type))
5332 /* Don't reshape if the class has constructors. */
5333 if (cxx_dialect == cxx98)
5334 error ("in C++98 %qD must be initialized by constructor, "
5338 else if (TREE_CODE (type) == VECTOR_TYPE && TYPE_VECTOR_OPAQUE (type))
5340 error ("opaque vector types cannot be initialized");
5341 init = error_mark_node;
5344 init = reshape_init (type, init);
5347 /* If DECL has an array type without a specific bound, deduce the
5348 array size from the initializer. */
5349 maybe_deduce_size_from_array_init (decl, init);
5350 type = TREE_TYPE (decl);
5351 if (type == error_mark_node)
5354 if (TYPE_NEEDS_CONSTRUCTING (type)
5355 || (CLASS_TYPE_P (type)
5356 && !(init && BRACE_ENCLOSED_INITIALIZER_P (init))))
5358 init_code = build_aggr_init_full_exprs (decl, init, flags);
5360 /* If this is a constexpr initializer, expand_default_init will
5361 have returned an INIT_EXPR rather than a CALL_EXPR. In that
5362 case, pull the initializer back out and pass it down into
5363 store_init_value. */
5364 while (TREE_CODE (init_code) == EXPR_STMT
5365 || TREE_CODE (init_code) == CONVERT_EXPR)
5366 init_code = TREE_OPERAND (init_code, 0);
5367 if (TREE_CODE (init_code) == INIT_EXPR)
5369 init = TREE_OPERAND (init_code, 1);
5370 init_code = NULL_TREE;
5371 /* Don't call digest_init; it's unnecessary and will complain
5372 about aggregate initialization of non-aggregate classes. */
5373 flags |= LOOKUP_ALREADY_DIGESTED;
5375 else if (DECL_DECLARED_CONSTEXPR_P (decl))
5377 /* Declared constexpr, but no suitable initializer; massage
5378 init appropriately so we can pass it into store_init_value
5380 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5381 init = finish_compound_literal (type, init);
5382 else if (CLASS_TYPE_P (type)
5383 && (!init || TREE_CODE (init) == TREE_LIST))
5385 init = build_functional_cast (type, init, tf_none);
5386 if (init != error_mark_node)
5387 TARGET_EXPR_DIRECT_INIT_P (init) = true;
5389 init_code = NULL_TREE;
5395 if (init && TREE_CODE (init) != TREE_VEC)
5397 init_code = store_init_value (decl, init, flags);
5398 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
5399 && DECL_INITIAL (decl)
5400 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
5401 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
5402 warning (0, "array %qD initialized by parenthesized string literal %qE",
5403 decl, DECL_INITIAL (decl));
5409 if (CLASS_TYPE_P (core_type = strip_array_types (type))
5410 && (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type)
5411 || CLASSTYPE_REF_FIELDS_NEED_INIT (core_type)))
5412 diagnose_uninitialized_cst_or_ref_member (core_type, /*using_new=*/false,
5415 check_for_uninitialized_const_var (decl);
5418 if (init && init != error_mark_node)
5419 init_code = build2 (INIT_EXPR, type, decl, init);
5422 init_code = add_stmt_to_compound (extra_init, init_code);
5424 if (init_code && DECL_IN_AGGR_P (decl))
5426 static int explained = 0;
5428 if (cxx_dialect < cxx0x)
5429 error ("initializer invalid for static member with constructor");
5431 error ("non-constant in-class initialization invalid for static "
5432 "member %qD", decl);
5435 error ("(an out of class initialization is required)");
5443 /* If DECL is not a local variable, give it RTL. */
5446 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
5448 int toplev = toplevel_bindings_p ();
5450 const char *filename;
5452 /* Set the DECL_ASSEMBLER_NAME for the object. */
5455 /* The `register' keyword, when used together with an
5456 asm-specification, indicates that the variable should be
5457 placed in a particular register. */
5458 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
5460 set_user_assembler_name (decl, asmspec);
5461 DECL_HARD_REGISTER (decl) = 1;
5465 if (TREE_CODE (decl) == FUNCTION_DECL
5466 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
5467 set_builtin_user_assembler_name (decl, asmspec);
5468 set_user_assembler_name (decl, asmspec);
5472 /* Handle non-variables up front. */
5473 if (TREE_CODE (decl) != VAR_DECL)
5475 rest_of_decl_compilation (decl, toplev, at_eof);
5479 /* If we see a class member here, it should be a static data
5481 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
5483 gcc_assert (TREE_STATIC (decl));
5484 /* An in-class declaration of a static data member should be
5485 external; it is only a declaration, and not a definition. */
5486 if (init == NULL_TREE)
5487 gcc_assert (DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl));
5490 /* We don't create any RTL for local variables. */
5491 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5494 /* We defer emission of local statics until the corresponding
5495 DECL_EXPR is expanded. */
5496 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
5498 /* We try to defer namespace-scope static constants so that they are
5499 not emitted into the object file unnecessarily. */
5500 filename = input_filename;
5501 if (!DECL_VIRTUAL_P (decl)
5502 && TREE_READONLY (decl)
5503 && DECL_INITIAL (decl) != NULL_TREE
5504 && DECL_INITIAL (decl) != error_mark_node
5506 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
5508 && !TREE_PUBLIC (decl))
5510 /* Fool with the linkage of static consts according to #pragma
5512 struct c_fileinfo *finfo = get_fileinfo (filename);
5513 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
5515 TREE_PUBLIC (decl) = 1;
5516 DECL_EXTERNAL (decl) = finfo->interface_only;
5521 /* Likewise for template instantiations. */
5522 else if (DECL_LANG_SPECIFIC (decl)
5523 && DECL_IMPLICIT_INSTANTIATION (decl))
5526 /* If we're not deferring, go ahead and assemble the variable. */
5528 rest_of_decl_compilation (decl, toplev, at_eof);
5531 /* walk_tree helper for wrap_temporary_cleanups, below. */
5534 wrap_cleanups_r (tree *stmt_p, int *walk_subtrees, void *data)
5536 if (TYPE_P (*stmt_p))
5542 if (TREE_CODE (*stmt_p) == TARGET_EXPR)
5544 tree guard = (tree)data;
5545 tree tcleanup = TARGET_EXPR_CLEANUP (*stmt_p);
5547 tcleanup = build2 (TRY_CATCH_EXPR, void_type_node, tcleanup, guard);
5548 /* Tell honor_protect_cleanup_actions to handle this as a separate
5550 TRY_CATCH_IS_CLEANUP (tcleanup) = 1;
5552 TARGET_EXPR_CLEANUP (*stmt_p) = tcleanup;
5558 /* We're initializing a local variable which has a cleanup GUARD. If there
5559 are any temporaries used in the initializer INIT of this variable, we
5560 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
5561 variable will be cleaned up properly if one of them throws.
5563 Unfortunately, there's no way to express this properly in terms of
5564 nesting, as the regions for the temporaries overlap the region for the
5565 variable itself; if there are two temporaries, the variable needs to be
5566 the first thing destroyed if either of them throws. However, we only
5567 want to run the variable's cleanup if it actually got constructed. So
5568 we need to guard the temporary cleanups with the variable's cleanup if
5569 they are run on the normal path, but not if they are run on the
5570 exceptional path. We implement this by telling
5571 honor_protect_cleanup_actions to strip the variable cleanup from the
5572 exceptional path. */
5575 wrap_temporary_cleanups (tree init, tree guard)
5577 cp_walk_tree_without_duplicates (&init, wrap_cleanups_r, (void *)guard);
5580 /* Generate code to initialize DECL (a local variable). */
5583 initialize_local_var (tree decl, tree init)
5585 tree type = TREE_TYPE (decl);
5589 gcc_assert (TREE_CODE (decl) == VAR_DECL
5590 || TREE_CODE (decl) == RESULT_DECL);
5591 gcc_assert (!TREE_STATIC (decl));
5593 if (DECL_SIZE (decl) == NULL_TREE)
5595 /* If we used it already as memory, it must stay in memory. */
5596 DECL_INITIAL (decl) = NULL_TREE;
5597 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
5601 if (type == error_mark_node)
5604 /* Compute and store the initial value. */
5605 already_used = TREE_USED (decl) || TREE_USED (type);
5606 if (TREE_USED (type))
5607 DECL_READ_P (decl) = 1;
5609 /* Generate a cleanup, if necessary. */
5610 cleanup = cxx_maybe_build_cleanup (decl);
5612 /* Perform the initialization. */
5615 int saved_stmts_are_full_exprs_p;
5617 /* If we're only initializing a single object, guard the destructors
5618 of any temporaries used in its initializer with its destructor.
5619 This isn't right for arrays because each element initialization is
5620 a full-expression. */
5621 if (cleanup && TREE_CODE (type) != ARRAY_TYPE)
5622 wrap_temporary_cleanups (init, cleanup);
5624 gcc_assert (building_stmt_tree ());
5625 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5626 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5627 finish_expr_stmt (init);
5628 current_stmt_tree ()->stmts_are_full_exprs_p =
5629 saved_stmts_are_full_exprs_p;
5632 /* Set this to 0 so we can tell whether an aggregate which was
5633 initialized was ever used. Don't do this if it has a
5634 destructor, so we don't complain about the 'resource
5635 allocation is initialization' idiom. Now set
5636 attribute((unused)) on types so decls of that type will be
5637 marked used. (see TREE_USED, above.) */
5638 if (TYPE_NEEDS_CONSTRUCTING (type)
5640 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
5641 && DECL_NAME (decl))
5642 TREE_USED (decl) = 0;
5643 else if (already_used)
5644 TREE_USED (decl) = 1;
5647 finish_decl_cleanup (decl, cleanup);
5650 /* DECL is a VAR_DECL for a compiler-generated variable with static
5651 storage duration (like a virtual table) whose initializer is a
5652 compile-time constant. Initialize the variable and provide it to the
5656 initialize_artificial_var (tree decl, VEC(constructor_elt,gc) *v)
5659 gcc_assert (DECL_ARTIFICIAL (decl));
5660 init = build_constructor (TREE_TYPE (decl), v);
5661 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
5662 DECL_INITIAL (decl) = init;
5663 DECL_INITIALIZED_P (decl) = 1;
5664 determine_visibility (decl);
5665 layout_var_decl (decl);
5666 maybe_commonize_var (decl);
5667 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
5670 /* INIT is the initializer for a variable, as represented by the
5671 parser. Returns true iff INIT is value-dependent. */
5674 value_dependent_init_p (tree init)
5676 if (TREE_CODE (init) == TREE_LIST)
5677 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5678 return any_value_dependent_elements_p (init);
5679 else if (TREE_CODE (init) == CONSTRUCTOR)
5680 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5682 VEC(constructor_elt, gc) *elts;
5686 elts = CONSTRUCTOR_ELTS (init);
5687 nelts = VEC_length (constructor_elt, elts);
5688 for (i = 0; i < nelts; ++i)
5689 if (value_dependent_init_p (VEC_index (constructor_elt,
5694 /* It must be a simple expression, e.g., int i = 3; */
5695 return value_dependent_expression_p (init);
5700 /* Finish processing of a declaration;
5701 install its line number and initial value.
5702 If the length of an array type is not known before,
5703 it must be determined now, from the initial value, or it is an error.
5705 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
5706 true, then INIT is an integral constant expression.
5708 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
5709 if the (init) syntax was used. */
5712 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
5713 tree asmspec_tree, int flags)
5717 const char *asmspec = NULL;
5718 int was_readonly = 0;
5719 bool var_definition_p = false;
5720 int saved_processing_template_decl;
5723 if (decl == error_mark_node)
5728 error ("assignment (not initialization) in declaration");
5732 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
5733 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
5734 gcc_assert (TREE_CODE (decl) != PARM_DECL);
5736 type = TREE_TYPE (decl);
5737 if (type == error_mark_node)
5740 /* Assume no cleanup is required. */
5741 cleanup = NULL_TREE;
5742 saved_processing_template_decl = processing_template_decl;
5744 /* If a name was specified, get the string. */
5745 if (global_scope_p (current_binding_level))
5746 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
5747 if (asmspec_tree && asmspec_tree != error_mark_node)
5748 asmspec = TREE_STRING_POINTER (asmspec_tree);
5750 if (current_class_type
5751 && CP_DECL_CONTEXT (decl) == current_class_type
5752 && TYPE_BEING_DEFINED (current_class_type)
5753 && (DECL_INITIAL (decl) || init))
5754 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
5756 auto_node = type_uses_auto (type);
5760 if (init == NULL_TREE)
5762 error ("declaration of %q#D has no initializer", decl);
5763 TREE_TYPE (decl) = error_mark_node;
5767 if (TREE_CODE (d_init) == TREE_LIST)
5768 d_init = build_x_compound_expr_from_list (d_init, ELK_INIT,
5769 tf_warning_or_error);
5770 d_init = resolve_nondeduced_context (d_init);
5771 if (describable_type (d_init))
5773 type = TREE_TYPE (decl) = do_auto_deduction (type, d_init,
5775 if (type == error_mark_node)
5780 if (TREE_CODE (decl) == FUNCTION_DECL)
5781 validate_constexpr_fundecl (decl);
5783 else if (!ensure_literal_type_for_constexpr_object (decl))
5784 DECL_DECLARED_CONSTEXPR_P (decl) = 0;
5786 if (init && TREE_CODE (decl) == FUNCTION_DECL)
5789 if (init == ridpointers[(int)RID_DELETE])
5791 /* FIXME check this is 1st decl. */
5792 DECL_DELETED_FN (decl) = 1;
5793 DECL_DECLARED_INLINE_P (decl) = 1;
5794 DECL_INITIAL (decl) = error_mark_node;
5795 FOR_EACH_CLONE (clone, decl)
5797 DECL_DELETED_FN (clone) = 1;
5798 DECL_DECLARED_INLINE_P (clone) = 1;
5799 DECL_INITIAL (clone) = error_mark_node;
5803 else if (init == ridpointers[(int)RID_DEFAULT])
5805 if (defaultable_fn_check (decl))
5806 DECL_DEFAULTED_FN (decl) = 1;
5808 DECL_INITIAL (decl) = NULL_TREE;
5812 if (init && TREE_CODE (decl) == VAR_DECL)
5814 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
5815 /* FIXME we rely on TREE_CONSTANT below; basing that on
5816 init_const_expr_p is probably wrong for C++0x. */
5817 if (init_const_expr_p)
5819 /* Set these flags now for C++98 templates. We'll update the
5820 flags in store_init_value for instantiations and C++0x. */
5821 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5822 if (decl_maybe_constant_var_p (decl))
5823 TREE_CONSTANT (decl) = 1;
5827 if (processing_template_decl)
5829 bool type_dependent_p;
5831 /* Add this declaration to the statement-tree. */
5832 if (at_function_scope_p ())
5833 add_decl_expr (decl);
5835 type_dependent_p = dependent_type_p (type);
5837 if (check_for_bare_parameter_packs (init))
5840 DECL_INITIAL (decl) = NULL_TREE;
5843 /* Generally, initializers in templates are expanded when the
5844 template is instantiated. But, if DECL is a variable constant
5845 then it can be used in future constant expressions, so its value
5846 must be available. */
5848 && DECL_CLASS_SCOPE_P (decl)
5849 /* We just set TREE_CONSTANT appropriately; see above. */
5850 && TREE_CONSTANT (decl)
5851 && !type_dependent_p
5852 /* FIXME non-value-dependent constant expression */
5853 && !value_dependent_init_p (init)))
5856 DECL_INITIAL (decl) = init;
5857 if (TREE_CODE (decl) == VAR_DECL
5858 && !DECL_PRETTY_FUNCTION_P (decl)
5859 && !type_dependent_p)
5860 maybe_deduce_size_from_array_init (decl, init);
5864 if (TREE_CODE (init) == TREE_LIST)
5866 /* If the parenthesized-initializer form was used (e.g.,
5867 "int A<N>::i(X)"), then INIT will be a TREE_LIST of initializer
5868 arguments. (There is generally only one.) We convert them
5871 for (; list; list = TREE_CHAIN (list))
5873 tree elt = TREE_VALUE (list);
5874 TREE_VALUE (list) = fold_non_dependent_expr (elt);
5878 init = fold_non_dependent_expr (init);
5879 processing_template_decl = 0;
5882 /* Take care of TYPE_DECLs up front. */
5883 if (TREE_CODE (decl) == TYPE_DECL)
5885 if (type != error_mark_node
5886 && MAYBE_CLASS_TYPE_P (type) && DECL_NAME (decl))
5888 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
5889 warning (0, "shadowing previous type declaration of %q#D", decl);
5890 set_identifier_type_value (DECL_NAME (decl), decl);
5893 /* If we have installed this as the canonical typedef for this
5894 type, and that type has not been defined yet, delay emitting
5895 the debug information for it, as we will emit it later. */
5896 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
5897 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
5898 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
5900 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl),
5905 /* A reference will be modified here, as it is initialized. */
5906 if (! DECL_EXTERNAL (decl)
5907 && TREE_READONLY (decl)
5908 && TREE_CODE (type) == REFERENCE_TYPE)
5911 TREE_READONLY (decl) = 0;
5914 if (TREE_CODE (decl) == VAR_DECL)
5916 /* Only variables with trivial initialization and destruction can
5917 have thread-local storage. */
5918 if (DECL_THREAD_LOCAL_P (decl)
5919 && (type_has_nontrivial_default_init (TREE_TYPE (decl))
5920 || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
5921 error ("%qD cannot be thread-local because it has non-trivial "
5922 "type %qT", decl, TREE_TYPE (decl));
5923 /* If this is a local variable that will need a mangled name,
5924 register it now. We must do this before processing the
5925 initializer for the variable, since the initialization might
5926 require a guard variable, and since the mangled name of the
5927 guard variable will depend on the mangled name of this
5929 if (DECL_FUNCTION_SCOPE_P (decl)
5930 && TREE_STATIC (decl)
5931 && !DECL_ARTIFICIAL (decl))
5933 push_local_name (decl);
5934 if (DECL_CONSTRUCTOR_P (current_function_decl)
5935 || DECL_DESTRUCTOR_P (current_function_decl))
5936 /* Normally local_decls is populated during GIMPLE lowering,
5937 but [cd]tors are never actually compiled directly. We need
5938 to put statics on the list so we can deal with the label
5939 address extension. */
5940 add_local_decl (cfun, decl);
5943 /* Convert the initializer to the type of DECL, if we have not
5944 already initialized DECL. */
5945 if (!DECL_INITIALIZED_P (decl)
5946 /* If !DECL_EXTERNAL then DECL is being defined. In the
5947 case of a static data member initialized inside the
5948 class-specifier, there can be an initializer even if DECL
5949 is *not* defined. */
5950 && (!DECL_EXTERNAL (decl) || init))
5952 if (TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
5955 = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
5956 /* Allow libjava/prims.cc define primitive classes. */
5957 if (init != NULL_TREE
5958 || jclass == NULL_TREE
5959 || TREE_CODE (jclass) != TYPE_DECL
5960 || !POINTER_TYPE_P (TREE_TYPE (jclass))
5961 || !same_type_ignoring_top_level_qualifiers_p
5962 (type, TREE_TYPE (TREE_TYPE (jclass))))
5963 error ("Java object %qD not allocated with %<new%>", decl);
5966 init = check_initializer (decl, init, flags, &cleanup);
5967 /* Thread-local storage cannot be dynamically initialized. */
5968 if (DECL_THREAD_LOCAL_P (decl) && init)
5970 error ("%qD is thread-local and so cannot be dynamically "
5971 "initialized", decl);
5975 /* Check that the initializer for a static data member was a
5976 constant. Although we check in the parser that the
5977 initializer is an integral constant expression, we do not
5978 simplify division-by-zero at the point at which it
5979 occurs. Therefore, in:
5981 struct S { static const int i = 7 / 0; };
5983 we issue an error at this point. It would
5984 probably be better to forbid division by zero in
5985 integral constant expressions. */
5986 if (DECL_EXTERNAL (decl) && init)
5988 error ("%qD cannot be initialized by a non-constant expression"
5989 " when being declared", decl);
5990 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
5998 The memory occupied by any object of static storage
5999 duration is zero-initialized at program startup before
6000 any other initialization takes place.
6002 We cannot create an appropriate initializer until after
6003 the type of DECL is finalized. If DECL_INITIAL is set,
6004 then the DECL is statically initialized, and any
6005 necessary zero-initialization has already been performed. */
6006 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
6007 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
6008 /*nelts=*/NULL_TREE,
6009 /*static_storage_p=*/true);
6010 /* Remember that the initialization for this variable has
6012 DECL_INITIALIZED_P (decl) = 1;
6013 /* This declaration is the definition of this variable,
6014 unless we are initializing a static data member within
6015 the class specifier. */
6016 if (!DECL_EXTERNAL (decl))
6017 var_definition_p = true;
6019 /* If the variable has an array type, lay out the type, even if
6020 there is no initializer. It is valid to index through the
6021 array, and we must get TYPE_ALIGN set correctly on the array
6023 else if (TREE_CODE (type) == ARRAY_TYPE)
6026 if (!processing_template_decl
6027 && TREE_STATIC (decl)
6028 && !at_function_scope_p ()
6029 && current_function_decl == NULL)
6030 /* So decl is a global variable or a static member of a
6031 non local class. Record the types it uses
6032 so that we can decide later to emit debug info for them. */
6033 record_types_used_by_current_var_decl (decl);
6035 else if (TREE_CODE (decl) == FIELD_DECL
6036 && TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6037 error ("non-static data member %qD has Java class type", decl);
6039 /* Add this declaration to the statement-tree. This needs to happen
6040 after the call to check_initializer so that the DECL_EXPR for a
6041 reference temp is added before the DECL_EXPR for the reference itself. */
6042 if (at_function_scope_p ())
6043 add_decl_expr (decl);
6045 /* Let the middle end know about variables and functions -- but not
6046 static data members in uninstantiated class templates. */
6047 if (!saved_processing_template_decl
6048 && (TREE_CODE (decl) == VAR_DECL
6049 || TREE_CODE (decl) == FUNCTION_DECL))
6051 if (TREE_CODE (decl) == VAR_DECL)
6053 layout_var_decl (decl);
6054 maybe_commonize_var (decl);
6057 /* This needs to happen after the linkage is set. */
6058 determine_visibility (decl);
6060 if (var_definition_p && TREE_STATIC (decl))
6062 /* If a TREE_READONLY variable needs initialization
6063 at runtime, it is no longer readonly and we need to
6064 avoid MEM_READONLY_P being set on RTL created for it. */
6067 if (TREE_READONLY (decl))
6068 TREE_READONLY (decl) = 0;
6071 else if (was_readonly)
6072 TREE_READONLY (decl) = 1;
6075 make_rtl_for_nonlocal_decl (decl, init, asmspec);
6077 /* Check for abstractness of the type. Notice that there is no
6078 need to strip array types here since the check for those types
6079 is already done within create_array_type_for_decl. */
6080 if (TREE_CODE (type) == FUNCTION_TYPE
6081 || TREE_CODE (type) == METHOD_TYPE)
6082 abstract_virtuals_error (decl, TREE_TYPE (type));
6084 abstract_virtuals_error (decl, type);
6086 if (TREE_TYPE (decl) == error_mark_node)
6087 /* No initialization required. */
6089 else if (TREE_CODE (decl) == FUNCTION_DECL)
6093 if (init == ridpointers[(int)RID_DEFAULT])
6095 /* An out-of-class default definition is defined at
6096 the point where it is explicitly defaulted. */
6097 if (DECL_INITIAL (decl) == error_mark_node)
6098 synthesize_method (decl);
6101 error ("function %q#D is initialized like a variable", decl);
6103 /* else no initialization required. */
6105 else if (DECL_EXTERNAL (decl)
6106 && ! (DECL_LANG_SPECIFIC (decl)
6107 && DECL_NOT_REALLY_EXTERN (decl)))
6110 DECL_INITIAL (decl) = init;
6112 /* A variable definition. */
6113 else if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
6114 /* Initialize the local variable. */
6115 initialize_local_var (decl, init);
6117 /* If a variable is defined, and then a subsequent
6118 definition with external linkage is encountered, we will
6119 get here twice for the same variable. We want to avoid
6120 calling expand_static_init more than once. For variables
6121 that are not static data members, we can call
6122 expand_static_init only when we actually process the
6123 initializer. It is not legal to redeclare a static data
6124 member, so this issue does not arise in that case. */
6125 else if (var_definition_p && TREE_STATIC (decl))
6126 expand_static_init (decl, init);
6129 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
6130 reference, insert it in the statement-tree now. */
6132 push_cleanup (decl, cleanup, false);
6135 processing_template_decl = saved_processing_template_decl;
6138 TREE_READONLY (decl) = 1;
6141 /* Returns a declaration for a VAR_DECL as if:
6143 extern "C" TYPE NAME;
6145 had been seen. Used to create compiler-generated global
6149 declare_global_var (tree name, tree type)
6153 push_to_top_level ();
6154 decl = build_decl (input_location, VAR_DECL, name, type);
6155 TREE_PUBLIC (decl) = 1;
6156 DECL_EXTERNAL (decl) = 1;
6157 DECL_ARTIFICIAL (decl) = 1;
6158 /* If the user has explicitly declared this variable (perhaps
6159 because the code we are compiling is part of a low-level runtime
6160 library), then it is possible that our declaration will be merged
6161 with theirs by pushdecl. */
6162 decl = pushdecl (decl);
6163 cp_finish_decl (decl, NULL_TREE, false, NULL_TREE, 0);
6164 pop_from_top_level ();
6169 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
6170 if "__cxa_atexit" is not being used) corresponding to the function
6171 to be called when the program exits. */
6174 get_atexit_fn_ptr_type (void)
6178 if (!atexit_fn_ptr_type_node)
6181 if (flag_use_cxa_atexit
6182 && !targetm.cxx.use_atexit_for_cxa_atexit ())
6183 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
6184 arg_type = ptr_type_node;
6186 /* The parameter to "atexit" is "void (*)(void)". */
6187 arg_type = NULL_TREE;
6189 fn_type = build_function_type_list (void_type_node,
6190 arg_type, NULL_TREE);
6191 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
6194 return atexit_fn_ptr_type_node;
6197 /* Returns a pointer to the `atexit' function. Note that if
6198 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
6199 `__cxa_atexit' function specified in the IA64 C++ ABI. */
6202 get_atexit_node (void)
6208 bool use_aeabi_atexit;
6213 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6215 /* The declaration for `__cxa_atexit' is:
6217 int __cxa_atexit (void (*)(void *), void *, void *)
6219 We build up the argument types and then the function type
6221 tree argtype0, argtype1, argtype2;
6223 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
6224 /* First, build the pointer-to-function type for the first
6226 fn_ptr_type = get_atexit_fn_ptr_type ();
6227 /* Then, build the rest of the argument types. */
6228 argtype2 = ptr_type_node;
6229 if (use_aeabi_atexit)
6231 argtype1 = fn_ptr_type;
6232 argtype0 = ptr_type_node;
6236 argtype1 = ptr_type_node;
6237 argtype0 = fn_ptr_type;
6239 /* And the final __cxa_atexit type. */
6240 fn_type = build_function_type_list (integer_type_node,
6241 argtype0, argtype1, argtype2,
6243 fn_ptr_type = build_pointer_type (fn_type);
6244 if (use_aeabi_atexit)
6245 name = "__aeabi_atexit";
6247 name = "__cxa_atexit";
6251 /* The declaration for `atexit' is:
6253 int atexit (void (*)());
6255 We build up the argument types and then the function type
6257 fn_ptr_type = get_atexit_fn_ptr_type ();
6258 /* Build the final atexit type. */
6259 fn_type = build_function_type_list (integer_type_node,
6260 fn_ptr_type, NULL_TREE);
6264 /* Now, build the function declaration. */
6265 push_lang_context (lang_name_c);
6266 atexit_fndecl = build_library_fn_ptr (name, fn_type);
6267 mark_used (atexit_fndecl);
6268 pop_lang_context ();
6269 atexit_node = decay_conversion (atexit_fndecl);
6274 /* Returns the __dso_handle VAR_DECL. */
6277 get_dso_handle_node (void)
6279 if (dso_handle_node)
6280 return dso_handle_node;
6282 /* Declare the variable. */
6283 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
6286 return dso_handle_node;
6289 /* Begin a new function with internal linkage whose job will be simply
6290 to destroy some particular variable. */
6292 static GTY(()) int start_cleanup_cnt;
6295 start_cleanup_fn (void)
6300 bool use_cxa_atexit = flag_use_cxa_atexit
6301 && !targetm.cxx.use_atexit_for_cxa_atexit ();
6303 push_to_top_level ();
6305 /* No need to mangle this. */
6306 push_lang_context (lang_name_c);
6308 /* Build the name of the function. */
6309 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
6310 /* Build the function declaration. */
6311 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
6312 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
6313 /* It's a function with internal linkage, generated by the
6315 TREE_PUBLIC (fndecl) = 0;
6316 DECL_ARTIFICIAL (fndecl) = 1;
6317 /* Make the function `inline' so that it is only emitted if it is
6318 actually needed. It is unlikely that it will be inlined, since
6319 it is only called via a function pointer, but we avoid unnecessary
6320 emissions this way. */
6321 DECL_DECLARED_INLINE_P (fndecl) = 1;
6322 DECL_INTERFACE_KNOWN (fndecl) = 1;
6323 /* Build the parameter. */
6328 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
6329 DECL_CONTEXT (parmdecl) = fndecl;
6330 TREE_USED (parmdecl) = 1;
6331 DECL_READ_P (parmdecl) = 1;
6332 DECL_ARGUMENTS (fndecl) = parmdecl;
6336 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
6338 pop_lang_context ();
6340 return current_function_decl;
6343 /* Finish the cleanup function begun by start_cleanup_fn. */
6346 end_cleanup_fn (void)
6348 expand_or_defer_fn (finish_function (0));
6350 pop_from_top_level ();
6353 /* Generate code to handle the destruction of DECL, an object with
6354 static storage duration. */
6357 register_dtor_fn (tree decl)
6364 tree arg0, arg1 = NULL_TREE, arg2 = NULL_TREE;
6366 type = TREE_TYPE (decl);
6367 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
6368 return void_zero_node;
6370 /* If we're using "__cxa_atexit" (or "__aeabi_atexit"), and DECL is
6371 a class object, we can just pass the destructor to
6372 "__cxa_atexit"; we don't have to build a temporary function to do
6374 use_dtor = (flag_use_cxa_atexit
6375 && !targetm.cxx.use_atexit_for_cxa_atexit ()
6376 && CLASS_TYPE_P (type));
6381 /* Find the destructor. */
6382 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
6383 gcc_assert (idx >= 0);
6384 cleanup = VEC_index (tree, CLASSTYPE_METHOD_VEC (type), idx);
6385 /* Make sure it is accessible. */
6386 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup);
6390 /* Call build_cleanup before we enter the anonymous function so
6391 that any access checks will be done relative to the current
6392 scope, rather than the scope of the anonymous function. */
6393 build_cleanup (decl);
6395 /* Now start the function. */
6396 cleanup = start_cleanup_fn ();
6398 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
6399 to the original function, rather than the anonymous one. That
6400 will make the back end think that nested functions are in use,
6401 which causes confusion. */
6402 push_deferring_access_checks (dk_no_check);
6403 fcall = build_cleanup (decl);
6404 pop_deferring_access_checks ();
6406 /* Create the body of the anonymous function. */
6407 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
6408 finish_expr_stmt (fcall);
6409 finish_compound_stmt (compound_stmt);
6413 /* Call atexit with the cleanup function. */
6414 mark_used (cleanup);
6415 cleanup = build_address (cleanup);
6416 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6422 /* We must convert CLEANUP to the type that "__cxa_atexit"
6424 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
6425 /* "__cxa_atexit" will pass the address of DECL to the
6426 cleanup function. */
6428 addr = build_address (decl);
6429 /* The declared type of the parameter to "__cxa_atexit" is
6430 "void *". For plain "T*", we could just let the
6431 machinery in cp_build_function_call convert it -- but if the
6432 type is "cv-qualified T *", then we need to convert it
6433 before passing it in, to avoid spurious errors. */
6434 addr = build_nop (ptr_type_node, addr);
6437 /* Since the cleanup functions we build ignore the address
6438 they're given, there's no reason to pass the actual address
6439 in, and, in general, it's cheaper to pass NULL than any
6441 addr = null_pointer_node;
6442 arg2 = cp_build_addr_expr (get_dso_handle_node (),
6443 tf_warning_or_error);
6444 if (targetm.cxx.use_aeabi_atexit ())
6457 return cp_build_function_call_nary (get_atexit_node (), tf_warning_or_error,
6458 arg0, arg1, arg2, NULL_TREE);
6461 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
6462 is its initializer. Generate code to handle the construction
6463 and destruction of DECL. */
6466 expand_static_init (tree decl, tree init)
6468 gcc_assert (TREE_CODE (decl) == VAR_DECL);
6469 gcc_assert (TREE_STATIC (decl));
6471 /* Some variables require no dynamic initialization. */
6473 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
6476 if (DECL_FUNCTION_SCOPE_P (decl))
6478 /* Emit code to perform this initialization but once. */
6479 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
6480 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
6481 tree guard, guard_addr;
6482 tree acquire_fn, release_fn, abort_fn;
6485 /* Emit code to perform this initialization but once. This code
6488 static <type> guard;
6489 if (!guard.first_byte) {
6490 if (__cxa_guard_acquire (&guard)) {
6493 // Do initialization.
6494 flag = true; __cxa_guard_release (&guard);
6495 // Register variable for destruction at end of program.
6497 if (!flag) __cxa_guard_abort (&guard);
6501 Note that the `flag' variable is only set to 1 *after* the
6502 initialization is complete. This ensures that an exception,
6503 thrown during the construction, will cause the variable to
6504 reinitialized when we pass through this code again, as per:
6508 If the initialization exits by throwing an exception, the
6509 initialization is not complete, so it will be tried again
6510 the next time control enters the declaration.
6512 This process should be thread-safe, too; multiple threads
6513 should not be able to initialize the variable more than
6516 /* Create the guard variable. */
6517 guard = get_guard (decl);
6519 /* This optimization isn't safe on targets with relaxed memory
6520 consistency. On such targets we force synchronization in
6521 __cxa_guard_acquire. */
6522 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6524 /* Begin the conditional initialization. */
6525 if_stmt = begin_if_stmt ();
6526 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
6527 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6530 if (flag_threadsafe_statics)
6532 guard_addr = build_address (guard);
6534 acquire_fn = get_identifier ("__cxa_guard_acquire");
6535 release_fn = get_identifier ("__cxa_guard_release");
6536 abort_fn = get_identifier ("__cxa_guard_abort");
6537 if (!get_global_value_if_present (acquire_fn, &acquire_fn))
6539 tree vfntype = build_function_type_list (void_type_node,
6540 TREE_TYPE (guard_addr),
6542 acquire_fn = push_library_fn
6543 (acquire_fn, build_function_type_list (integer_type_node,
6544 TREE_TYPE (guard_addr),
6547 release_fn = push_library_fn (release_fn, vfntype, NULL_TREE);
6548 abort_fn = push_library_fn (abort_fn, vfntype, NULL_TREE);
6552 release_fn = identifier_global_value (release_fn);
6553 abort_fn = identifier_global_value (abort_fn);
6556 inner_if_stmt = begin_if_stmt ();
6557 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
6560 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6561 begin = get_target_expr (boolean_false_node);
6562 flag = TARGET_EXPR_SLOT (begin);
6564 TARGET_EXPR_CLEANUP (begin)
6565 = build3 (COND_EXPR, void_type_node, flag,
6567 build_call_n (abort_fn, 1, guard_addr));
6568 CLEANUP_EH_ONLY (begin) = 1;
6570 /* Do the initialization itself. */
6571 init = add_stmt_to_compound (begin, init);
6572 init = add_stmt_to_compound
6573 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
6574 init = add_stmt_to_compound
6575 (init, build_call_n (release_fn, 1, guard_addr));
6578 init = add_stmt_to_compound (init, set_guard (guard));
6580 /* Use atexit to register a function for destroying this static
6582 init = add_stmt_to_compound (init, register_dtor_fn (decl));
6584 finish_expr_stmt (init);
6586 if (flag_threadsafe_statics)
6588 finish_compound_stmt (inner_then_clause);
6589 finish_then_clause (inner_if_stmt);
6590 finish_if_stmt (inner_if_stmt);
6593 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6595 finish_compound_stmt (then_clause);
6596 finish_then_clause (if_stmt);
6597 finish_if_stmt (if_stmt);
6601 static_aggregates = tree_cons (init, decl, static_aggregates);
6605 /* Make TYPE a complete type based on INITIAL_VALUE.
6606 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
6607 2 if there was no information (in which case assume 0 if DO_DEFAULT),
6608 3 if the initializer list is empty (in pedantic mode). */
6611 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
6614 tree type, elt_type;
6618 unsigned HOST_WIDE_INT i;
6621 /* An array of character type can be initialized from a
6622 brace-enclosed string constant.
6624 FIXME: this code is duplicated from reshape_init. Probably
6625 we should just call reshape_init here? */
6626 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
6627 && TREE_CODE (initial_value) == CONSTRUCTOR
6628 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
6630 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
6631 tree value = VEC_index (constructor_elt, v, 0)->value;
6633 if (TREE_CODE (value) == STRING_CST
6634 && VEC_length (constructor_elt, v) == 1)
6635 initial_value = value;
6638 /* If any of the elements are parameter packs, we can't actually
6639 complete this type now because the array size is dependent. */
6640 if (TREE_CODE (initial_value) == CONSTRUCTOR)
6642 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value),
6645 if (PACK_EXPANSION_P (value))
6651 failure = complete_array_type (ptype, initial_value, do_default);
6653 /* We can create the array before the element type is complete, which
6654 means that we didn't have these two bits set in the original type
6655 either. In completing the type, we are expected to propagate these
6656 bits. See also complete_type which does the same thing for arrays
6659 if (TYPE_DOMAIN (type))
6661 elt_type = TREE_TYPE (type);
6662 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
6663 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
6664 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
6670 /* Return zero if something is declared to be a member of type
6671 CTYPE when in the context of CUR_TYPE. STRING is the error
6672 message to print in that case. Otherwise, quietly return 1. */
6675 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
6677 if (ctype && ctype != cur_type)
6679 if (flags == DTOR_FLAG)
6680 error ("destructor for alien class %qT cannot be a member", ctype);
6682 error ("constructor for alien class %qT cannot be a member", ctype);
6688 /* Subroutine of `grokdeclarator'. */
6690 /* Generate errors possibly applicable for a given set of specifiers.
6691 This is for ARM $7.1.2. */
6694 bad_specifiers (tree object,
6695 enum bad_spec_place type,
6706 error ("%qD declared as a %<virtual%> variable", object);
6708 error ("%qD declared as an %<inline%> variable", object);
6710 error ("%<const%> and %<volatile%> function specifiers on "
6711 "%qD invalid in variable declaration", object);
6715 error ("%qD declared as a %<virtual%> parameter", object);
6717 error ("%qD declared as an %<inline%> parameter", object);
6719 error ("%<const%> and %<volatile%> function specifiers on "
6720 "%qD invalid in parameter declaration", object);
6724 error ("%qD declared as a %<virtual%> type", object);
6726 error ("%qD declared as an %<inline%> type", object);
6728 error ("%<const%> and %<volatile%> function specifiers on "
6729 "%qD invalid in type declaration", object);
6733 error ("%qD declared as a %<virtual%> field", object);
6735 error ("%qD declared as an %<inline%> field", object);
6737 error ("%<const%> and %<volatile%> function specifiers on "
6738 "%qD invalid in field declaration", object);
6744 error ("%q+D declared as a friend", object);
6746 && (TREE_CODE (object) == TYPE_DECL
6747 || (!TYPE_PTRFN_P (TREE_TYPE (object))
6748 && !TYPE_REFFN_P (TREE_TYPE (object))
6749 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
6750 error ("%q+D declared with an exception specification", object);
6753 /* DECL is a member function or static data member and is presently
6754 being defined. Check that the definition is taking place in a
6758 check_class_member_definition_namespace (tree decl)
6760 /* These checks only apply to member functions and static data
6762 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
6763 || TREE_CODE (decl) == VAR_DECL);
6764 /* We check for problems with specializations in pt.c in
6765 check_specialization_namespace, where we can issue better
6767 if (processing_specialization)
6769 /* There are no restrictions on the placement of
6770 explicit instantiations. */
6771 if (processing_explicit_instantiation)
6775 A member function definition that appears outside of the
6776 class definition shall appear in a namespace scope enclosing
6777 the class definition.
6781 The definition for a static data member shall appear in a
6782 namespace scope enclosing the member's class definition. */
6783 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
6784 permerror (input_location, "definition of %qD is not in namespace enclosing %qT",
6785 decl, DECL_CONTEXT (decl));
6788 /* Build a PARM_DECL for the "this" parameter. TYPE is the
6789 METHOD_TYPE for a non-static member function; QUALS are the
6790 cv-qualifiers that apply to the function. */
6793 build_this_parm (tree type, cp_cv_quals quals)
6798 cp_cv_quals this_quals;
6800 this_type = TREE_VALUE (TYPE_ARG_TYPES (type));
6801 /* The `this' parameter is implicitly `const'; it cannot be
6803 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
6804 qual_type = cp_build_qualified_type (this_type, this_quals);
6805 parm = build_artificial_parm (this_identifier, qual_type);
6806 cp_apply_type_quals_to_decl (this_quals, parm);
6810 /* CTYPE is class type, or null if non-class.
6811 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
6813 DECLARATOR is the function's name.
6814 PARMS is a chain of PARM_DECLs for the function.
6815 VIRTUALP is truthvalue of whether the function is virtual or not.
6816 FLAGS are to be passed through to `grokclassfn'.
6817 QUALS are qualifiers indicating whether the function is `const'
6819 RAISES is a list of exceptions that this function can raise.
6820 CHECK is 1 if we must find this method in CTYPE, 0 if we should
6821 not look, and -1 if we should not call `grokclassfn' at all.
6823 SFK is the kind of special function (if any) for the new function.
6825 Returns `NULL_TREE' if something goes wrong, after issuing
6826 applicable error messages. */
6829 grokfndecl (tree ctype,
6833 tree orig_declarator,
6835 enum overload_flags flags,
6842 special_function_kind sfk,
6847 location_t location)
6850 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
6854 type = build_exception_variant (type, raises);
6856 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
6858 /* If we have an explicit location, use it, otherwise use whatever
6859 build_lang_decl used (probably input_location). */
6860 if (location != UNKNOWN_LOCATION)
6861 DECL_SOURCE_LOCATION (decl) = location;
6863 if (TREE_CODE (type) == METHOD_TYPE)
6866 parm = build_this_parm (type, quals);
6867 DECL_CHAIN (parm) = parms;
6870 DECL_ARGUMENTS (decl) = parms;
6871 for (t = parms; t; t = DECL_CHAIN (t))
6872 DECL_CONTEXT (t) = decl;
6873 /* Propagate volatile out from type to decl. */
6874 if (TYPE_VOLATILE (type))
6875 TREE_THIS_VOLATILE (decl) = 1;
6877 /* Setup decl according to sfk. */
6880 case sfk_constructor:
6881 case sfk_copy_constructor:
6882 case sfk_move_constructor:
6883 DECL_CONSTRUCTOR_P (decl) = 1;
6885 case sfk_destructor:
6886 DECL_DESTRUCTOR_P (decl) = 1;
6892 /* If pointers to member functions use the least significant bit to
6893 indicate whether a function is virtual, ensure a pointer
6894 to this function will have that bit clear. */
6895 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
6896 && TREE_CODE (type) == METHOD_TYPE
6897 && DECL_ALIGN (decl) < 2 * BITS_PER_UNIT)
6898 DECL_ALIGN (decl) = 2 * BITS_PER_UNIT;
6901 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
6905 ("defining explicit specialization %qD in friend declaration",
6909 tree fns = TREE_OPERAND (orig_declarator, 0);
6910 tree args = TREE_OPERAND (orig_declarator, 1);
6912 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
6914 /* Something like `template <class T> friend void f<T>()'. */
6915 error ("invalid use of template-id %qD in declaration "
6916 "of primary template",
6922 /* A friend declaration of the form friend void f<>(). Record
6923 the information in the TEMPLATE_ID_EXPR. */
6924 SET_DECL_IMPLICIT_INSTANTIATION (decl);
6926 if (TREE_CODE (fns) == COMPONENT_REF)
6928 /* Due to bison parser ickiness, we will have already looked
6929 up an operator_name or PFUNCNAME within the current class
6930 (see template_id in parse.y). If the current class contains
6931 such a name, we'll get a COMPONENT_REF here. Undo that. */
6933 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
6934 == current_class_type);
6935 fns = TREE_OPERAND (fns, 1);
6937 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
6938 || TREE_CODE (fns) == OVERLOAD);
6939 DECL_TEMPLATE_INFO (decl) = build_template_info (fns, args);
6941 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
6942 if (TREE_PURPOSE (t)
6943 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
6945 error ("default arguments are not allowed in declaration "
6946 "of friend template specialization %qD",
6953 error ("%<inline%> is not allowed in declaration of friend "
6954 "template specialization %qD",
6961 /* If this decl has namespace scope, set that up. */
6963 set_decl_namespace (decl, in_namespace, friendp);
6965 DECL_CONTEXT (decl) = FROB_CONTEXT (current_decl_namespace ());
6967 /* `main' and builtins have implicit 'C' linkage. */
6968 if ((MAIN_NAME_P (declarator)
6969 || (IDENTIFIER_LENGTH (declarator) > 10
6970 && IDENTIFIER_POINTER (declarator)[0] == '_'
6971 && IDENTIFIER_POINTER (declarator)[1] == '_'
6972 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
6973 && current_lang_name == lang_name_cplusplus
6974 && ctype == NULL_TREE
6975 && DECL_FILE_SCOPE_P (decl))
6976 SET_DECL_LANGUAGE (decl, lang_c);
6978 /* Should probably propagate const out from type to decl I bet (mrs). */
6981 DECL_STATIC_FUNCTION_P (decl) = 1;
6982 DECL_CONTEXT (decl) = ctype;
6987 DECL_CONTEXT (decl) = ctype;
6989 check_class_member_definition_namespace (decl);
6992 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
6994 if (processing_template_decl)
6995 error ("cannot declare %<::main%> to be a template");
6997 error ("cannot declare %<::main%> to be inline");
6999 error ("cannot declare %<::main%> to be static");
7004 /* Members of anonymous types and local classes have no linkage; make
7005 them internal. If a typedef is made later, this will be changed. */
7006 if (ctype && (TYPE_ANONYMOUS_P (ctype)
7007 || decl_function_context (TYPE_MAIN_DECL (ctype))))
7010 if (publicp && cxx_dialect == cxx98)
7012 /* [basic.link]: A name with no linkage (notably, the name of a class
7013 or enumeration declared in a local scope) shall not be used to
7014 declare an entity with linkage.
7016 DR 757 relaxes this restriction for C++0x. */
7017 t = no_linkage_check (TREE_TYPE (decl),
7018 /*relaxed_p=*/false);
7021 if (TYPE_ANONYMOUS_P (t))
7023 if (DECL_EXTERN_C_P (decl))
7024 /* Allow this; it's pretty common in C. */;
7027 permerror (input_location, "anonymous type with no linkage "
7028 "used to declare function %q#D with linkage",
7030 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7031 permerror (input_location, "%q+#D does not refer to the unqualified "
7032 "type, so it is not used for linkage",
7037 permerror (input_location, "type %qT with no linkage used to "
7038 "declare function %q#D with linkage", t, decl);
7042 TREE_PUBLIC (decl) = publicp;
7045 DECL_INTERFACE_KNOWN (decl) = 1;
7046 DECL_NOT_REALLY_EXTERN (decl) = 1;
7049 /* If the declaration was declared inline, mark it as such. */
7051 DECL_DECLARED_INLINE_P (decl) = 1;
7053 DECL_DECLARED_CONSTEXPR_P (decl) = true;
7055 DECL_EXTERNAL (decl) = 1;
7056 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
7059 ? G_("static member function %qD cannot have cv-qualifier")
7060 : G_("non-member function %qD cannot have cv-qualifier"),
7062 quals = TYPE_UNQUALIFIED;
7065 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
7066 && !grok_op_properties (decl, /*complain=*/true))
7070 /* Make the init_value nonzero so pushdecl knows this is not
7071 tentative. error_mark_node is replaced later with the BLOCK. */
7072 DECL_INITIAL (decl) = error_mark_node;
7074 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
7075 TREE_NOTHROW (decl) = 1;
7077 /* Caller will do the rest of this. */
7081 if (ctype != NULL_TREE)
7082 grokclassfn (ctype, decl, flags);
7084 decl = check_explicit_specialization (orig_declarator, decl,
7087 4 * (friendp != 0));
7088 if (decl == error_mark_node)
7093 cplus_decl_attributes (&decl, *attrlist, 0);
7094 *attrlist = NULL_TREE;
7097 /* Check main's type after attributes have been applied. */
7098 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7100 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
7103 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
7105 error ("%<::main%> must return %<int%>");
7106 newtype = build_function_type (integer_type_node, oldtypeargs);
7107 TREE_TYPE (decl) = newtype;
7110 check_main_parameter_types (decl);
7113 if (ctype != NULL_TREE
7114 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
7117 tree old_decl = check_classfn (ctype, decl,
7118 (processing_template_decl
7119 > template_class_depth (ctype))
7120 ? current_template_parms
7123 if (old_decl == error_mark_node)
7131 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
7132 /* Because grokfndecl is always supposed to return a
7133 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
7134 here. We depend on our callers to figure out that its
7135 really a template that's being returned. */
7136 old_decl = DECL_TEMPLATE_RESULT (old_decl);
7138 if (DECL_STATIC_FUNCTION_P (old_decl)
7139 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
7140 /* Remove the `this' parm added by grokclassfn.
7141 XXX Isn't this done in start_function, too? */
7142 revert_static_member_fn (decl);
7143 if (DECL_ARTIFICIAL (old_decl))
7145 error ("definition of implicitly-declared %qD", old_decl);
7149 /* Since we've smashed OLD_DECL to its
7150 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
7151 if (TREE_CODE (decl) == TEMPLATE_DECL)
7152 decl = DECL_TEMPLATE_RESULT (decl);
7154 /* Attempt to merge the declarations. This can fail, in
7155 the case of some invalid specialization declarations. */
7156 pushed_scope = push_scope (ctype);
7157 ok = duplicate_decls (decl, old_decl, friendp);
7159 pop_scope (pushed_scope);
7162 error ("no %q#D member function declared in class %qT",
7170 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
7173 if (ctype == NULL_TREE || check)
7177 DECL_VIRTUAL_P (decl) = 1;
7182 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
7183 the linkage that DECL will receive in the object file. */
7186 set_linkage_for_static_data_member (tree decl)
7188 /* A static data member always has static storage duration and
7189 external linkage. Note that static data members are forbidden in
7190 local classes -- the only situation in which a class has
7191 non-external linkage. */
7192 TREE_PUBLIC (decl) = 1;
7193 TREE_STATIC (decl) = 1;
7194 /* For non-template classes, static data members are always put
7195 out in exactly those files where they are defined, just as
7196 with ordinary namespace-scope variables. */
7197 if (!processing_template_decl)
7198 DECL_INTERFACE_KNOWN (decl) = 1;
7201 /* Create a VAR_DECL named NAME with the indicated TYPE.
7203 If SCOPE is non-NULL, it is the class type or namespace containing
7204 the variable. If SCOPE is NULL, the variable should is created in
7205 the innermost enclosings scope. */
7208 grokvardecl (tree type,
7210 const cp_decl_specifier_seq *declspecs,
7216 tree explicit_scope;
7218 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
7220 /* Compute the scope in which to place the variable, but remember
7221 whether or not that scope was explicitly specified by the user. */
7222 explicit_scope = scope;
7225 /* An explicit "extern" specifier indicates a namespace-scope
7227 if (declspecs->storage_class == sc_extern)
7228 scope = current_decl_namespace ();
7229 else if (!at_function_scope_p ())
7230 scope = current_scope ();
7234 && (/* If the variable is a namespace-scope variable declared in a
7235 template, we need DECL_LANG_SPECIFIC. */
7236 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
7237 /* Similarly for namespace-scope variables with language linkage
7239 || (TREE_CODE (scope) == NAMESPACE_DECL
7240 && current_lang_name != lang_name_cplusplus)
7241 /* Similarly for static data members. */
7243 decl = build_lang_decl (VAR_DECL, name, type);
7245 decl = build_decl (input_location, VAR_DECL, name, type);
7247 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
7248 set_decl_namespace (decl, explicit_scope, 0);
7250 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
7252 if (declspecs->storage_class == sc_extern)
7254 DECL_THIS_EXTERN (decl) = 1;
7255 DECL_EXTERNAL (decl) = !initialized;
7258 if (DECL_CLASS_SCOPE_P (decl))
7260 set_linkage_for_static_data_member (decl);
7261 /* This function is only called with out-of-class definitions. */
7262 DECL_EXTERNAL (decl) = 0;
7263 check_class_member_definition_namespace (decl);
7265 /* At top level, either `static' or no s.c. makes a definition
7266 (perhaps tentative), and absence of `static' makes it public. */
7267 else if (toplevel_bindings_p ())
7269 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
7270 && (DECL_THIS_EXTERN (decl) || ! constp));
7271 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
7273 /* Not at top level, only `static' makes a static definition. */
7276 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
7277 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
7280 if (declspecs->specs[(int)ds_thread])
7281 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
7283 /* If the type of the decl has no linkage, make sure that we'll
7284 notice that in mark_used. */
7285 if (cxx_dialect > cxx98
7286 && decl_linkage (decl) != lk_none
7287 && DECL_LANG_SPECIFIC (decl) == NULL
7288 && !DECL_EXTERN_C_P (decl)
7289 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
7290 retrofit_lang_decl (decl);
7292 if (TREE_PUBLIC (decl))
7294 /* [basic.link]: A name with no linkage (notably, the name of a class
7295 or enumeration declared in a local scope) shall not be used to
7296 declare an entity with linkage.
7298 DR 757 relaxes this restriction for C++0x. */
7299 tree t = (cxx_dialect > cxx98 ? NULL_TREE
7300 : no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false));
7303 if (TYPE_ANONYMOUS_P (t))
7305 if (DECL_EXTERN_C_P (decl))
7306 /* Allow this; it's pretty common in C. */
7310 /* DRs 132, 319 and 389 seem to indicate types with
7311 no linkage can only be used to declare extern "C"
7312 entities. Since it's not always an error in the
7313 ISO C++ 90 Standard, we only issue a warning. */
7314 warning (0, "anonymous type with no linkage used to declare "
7315 "variable %q#D with linkage", decl);
7316 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7317 warning (0, "%q+#D does not refer to the unqualified "
7318 "type, so it is not used for linkage",
7323 warning (0, "type %qT with no linkage used to declare variable "
7324 "%q#D with linkage", t, decl);
7328 DECL_INTERFACE_KNOWN (decl) = 1;
7333 /* Create and return a canonical pointer to member function type, for
7334 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
7337 build_ptrmemfunc_type (tree type)
7341 tree unqualified_variant = NULL_TREE;
7343 if (type == error_mark_node)
7346 /* If a canonical type already exists for this type, use it. We use
7347 this method instead of type_hash_canon, because it only does a
7348 simple equality check on the list of field members. */
7350 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
7353 /* Make sure that we always have the unqualified pointer-to-member
7355 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7357 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
7359 t = make_class_type (RECORD_TYPE);
7360 xref_basetypes (t, NULL_TREE);
7362 /* Let the front end know this is a pointer to member function... */
7363 TYPE_PTRMEMFUNC_FLAG (t) = 1;
7364 /* ... and not really a class type. */
7365 SET_CLASS_TYPE_P (t, 0);
7367 field = build_decl (input_location, FIELD_DECL, pfn_identifier, type);
7370 field = build_decl (input_location, FIELD_DECL, delta_identifier,
7372 DECL_CHAIN (field) = fields;
7375 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
7377 /* Zap out the name so that the back end will give us the debugging
7378 information for this anonymous RECORD_TYPE. */
7379 TYPE_NAME (t) = NULL_TREE;
7381 /* If this is not the unqualified form of this pointer-to-member
7382 type, set the TYPE_MAIN_VARIANT for this type to be the
7383 unqualified type. Since they are actually RECORD_TYPEs that are
7384 not variants of each other, we must do this manually.
7385 As we just built a new type there is no need to do yet another copy. */
7386 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7388 int type_quals = cp_type_quals (type);
7389 TYPE_READONLY (t) = (type_quals & TYPE_QUAL_CONST) != 0;
7390 TYPE_VOLATILE (t) = (type_quals & TYPE_QUAL_VOLATILE) != 0;
7391 TYPE_RESTRICT (t) = (type_quals & TYPE_QUAL_RESTRICT) != 0;
7392 TYPE_MAIN_VARIANT (t) = unqualified_variant;
7393 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
7394 TYPE_NEXT_VARIANT (unqualified_variant) = t;
7395 TREE_TYPE (TYPE_BINFO (t)) = t;
7398 /* Cache this pointer-to-member type so that we can find it again
7400 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
7402 if (TYPE_STRUCTURAL_EQUALITY_P (type))
7403 SET_TYPE_STRUCTURAL_EQUALITY (t);
7404 else if (TYPE_CANONICAL (type) != type)
7405 TYPE_CANONICAL (t) = build_ptrmemfunc_type (TYPE_CANONICAL (type));
7410 /* Create and return a pointer to data member type. */
7413 build_ptrmem_type (tree class_type, tree member_type)
7415 if (TREE_CODE (member_type) == METHOD_TYPE)
7417 cp_cv_quals quals = type_memfn_quals (member_type);
7418 member_type = build_memfn_type (member_type, class_type, quals);
7419 return build_ptrmemfunc_type (build_pointer_type (member_type));
7423 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
7424 return build_offset_type (class_type, member_type);
7428 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
7429 Check to see that the definition is valid. Issue appropriate error
7430 messages. Return 1 if the definition is particularly bad, or 0
7434 check_static_variable_definition (tree decl, tree type)
7436 /* If DECL is declared constexpr, we'll do the appropriate checks
7437 in check_initializer. */
7438 if (DECL_P (decl) && DECL_DECLARED_CONSTEXPR_P (decl))
7440 else if (cxx_dialect >= cxx0x && !INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7442 if (literal_type_p (type))
7443 error ("%<constexpr%> needed for in-class initialization of static "
7444 "data member %q#D of non-integral type", decl);
7446 error ("in-class initialization of static data member %q#D of "
7447 "non-literal type", decl);
7451 /* Motion 10 at San Diego: If a static const integral data member is
7452 initialized with an integral constant expression, the initializer
7453 may appear either in the declaration (within the class), or in
7454 the definition, but not both. If it appears in the class, the
7455 member is a member constant. The file-scope definition is always
7457 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
7459 error ("invalid in-class initialization of static data member "
7460 "of non-integral type %qT",
7464 else if (!CP_TYPE_CONST_P (type))
7465 error ("ISO C++ forbids in-class initialization of non-const "
7466 "static member %qD",
7468 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7469 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids initialization of member constant "
7470 "%qD of non-integral type %qT", decl, type);
7475 /* Given the SIZE (i.e., number of elements) in an array, compute an
7476 appropriate index type for the array. If non-NULL, NAME is the
7477 name of the thing being declared. */
7480 compute_array_index_type (tree name, tree size, tsubst_flags_t complain)
7485 tree abi_1_itype = NULL_TREE;
7487 if (error_operand_p (size))
7488 return error_mark_node;
7490 type = TREE_TYPE (size);
7491 /* type_dependent_expression_p? */
7492 if (!dependent_type_p (type))
7494 mark_rvalue_use (size);
7496 if (cxx_dialect < cxx0x && TREE_CODE (size) == NOP_EXPR
7497 && TREE_SIDE_EFFECTS (size))
7498 /* In C++98, we mark a non-constant array bound with a magic
7499 NOP_EXPR with TREE_SIDE_EFFECTS; don't fold in that case. */;
7502 size = fold_non_dependent_expr (size);
7504 if (CLASS_TYPE_P (type)
7505 && CLASSTYPE_LITERAL_P (type))
7507 size = build_expr_type_conversion (WANT_INT, size, true);
7508 if (size == error_mark_node)
7509 return error_mark_node;
7510 type = TREE_TYPE (size);
7513 size = maybe_constant_value (size);
7516 if (error_operand_p (size))
7517 return error_mark_node;
7519 /* The array bound must be an integer type. */
7520 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
7522 if (!(complain & tf_error))
7523 return error_mark_node;
7525 error ("size of array %qD has non-integral type %qT", name, type);
7527 error ("size of array has non-integral type %qT", type);
7528 size = integer_one_node;
7529 type = TREE_TYPE (size);
7533 /* A type is dependent if it is...an array type constructed from any
7534 dependent type or whose size is specified by a constant expression
7535 that is value-dependent. */
7536 /* We can only call value_dependent_expression_p on integral constant
7537 expressions; treat non-constant expressions as dependent, too. */
7538 if (processing_template_decl
7539 && (dependent_type_p (type)
7540 || !TREE_CONSTANT (size) || value_dependent_expression_p (size)))
7542 /* We cannot do any checking for a SIZE that isn't known to be
7543 constant. Just build the index type and mark that it requires
7544 structural equality checks. */
7545 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7546 size, integer_one_node));
7547 TYPE_DEPENDENT_P (itype) = 1;
7548 TYPE_DEPENDENT_P_VALID (itype) = 1;
7549 SET_TYPE_STRUCTURAL_EQUALITY (itype);
7553 if (!abi_version_at_least (2) && processing_template_decl)
7554 /* For abi-1, we handled all instances in templates the same way,
7555 even when they were non-dependent. This affects the manglings
7556 produced. So, we do the normal checking for non-dependent
7557 sizes, but at the end we'll return the same type that abi-1
7558 would have, but with TYPE_CANONICAL set to the "right"
7559 value that the current ABI would provide. */
7560 abi_1_itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7561 osize, integer_one_node));
7563 /* Normally, the array-bound will be a constant. */
7564 if (TREE_CODE (size) == INTEGER_CST)
7566 /* Check to see if the array bound overflowed. Make that an
7567 error, no matter how generous we're being. */
7568 constant_expression_error (size);
7570 /* An array must have a positive number of elements. */
7571 if (INT_CST_LT (size, integer_zero_node))
7573 if (!(complain & tf_error))
7574 return error_mark_node;
7576 error ("size of array %qD is negative", name);
7578 error ("size of array is negative");
7579 size = integer_one_node;
7581 /* As an extension we allow zero-sized arrays. */
7582 else if (integer_zerop (size))
7584 if (!(complain & tf_error))
7585 /* We must fail if performing argument deduction (as
7586 indicated by the state of complain), so that
7587 another substitution can be found. */
7588 return error_mark_node;
7589 else if (in_system_header)
7590 /* Allow them in system headers because glibc uses them. */;
7592 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array %qD", name);
7594 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array");
7597 else if (TREE_CONSTANT (size)
7598 /* We don't allow VLAs at non-function scopes, or during
7599 tentative template substitution. */
7600 || !at_function_scope_p () || !(complain & tf_error))
7602 if (!(complain & tf_error))
7603 return error_mark_node;
7604 /* `(int) &fn' is not a valid array bound. */
7606 error ("size of array %qD is not an integral constant-expression",
7609 error ("size of array is not an integral constant-expression");
7610 size = integer_one_node;
7612 else if (pedantic && warn_vla != 0)
7615 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array %qD", name);
7617 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array");
7619 else if (warn_vla > 0)
7623 "variable length array %qD is used", name);
7626 "variable length array is used");
7629 if (processing_template_decl && !TREE_CONSTANT (size))
7630 /* A variable sized array. */
7631 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
7634 HOST_WIDE_INT saved_processing_template_decl;
7636 /* Compute the index of the largest element in the array. It is
7637 one less than the number of elements in the array. We save
7638 and restore PROCESSING_TEMPLATE_DECL so that computations in
7639 cp_build_binary_op will be appropriately folded. */
7640 saved_processing_template_decl = processing_template_decl;
7641 processing_template_decl = 0;
7642 itype = cp_build_binary_op (input_location,
7644 cp_convert (ssizetype, size),
7645 cp_convert (ssizetype, integer_one_node),
7646 tf_warning_or_error);
7647 itype = fold (itype);
7648 processing_template_decl = saved_processing_template_decl;
7650 if (!TREE_CONSTANT (itype))
7651 /* A variable sized array. */
7652 itype = variable_size (itype);
7653 /* Make sure that there was no overflow when creating to a signed
7654 index type. (For example, on a 32-bit machine, an array with
7655 size 2^32 - 1 is too big.) */
7656 else if (TREE_CODE (itype) == INTEGER_CST
7657 && TREE_OVERFLOW (itype))
7659 if (!(complain & tf_error))
7660 return error_mark_node;
7661 error ("overflow in array dimension");
7662 TREE_OVERFLOW (itype) = 0;
7666 /* Create and return the appropriate index type. */
7669 tree t = build_index_type (itype);
7670 TYPE_CANONICAL (abi_1_itype) = TYPE_CANONICAL (t);
7671 itype = abi_1_itype;
7674 itype = build_index_type (itype);
7676 /* If the index type were dependent, we would have returned early, so
7677 remember that it isn't. */
7678 TYPE_DEPENDENT_P (itype) = 0;
7679 TYPE_DEPENDENT_P_VALID (itype) = 1;
7683 /* Returns the scope (if any) in which the entity declared by
7684 DECLARATOR will be located. If the entity was declared with an
7685 unqualified name, NULL_TREE is returned. */
7688 get_scope_of_declarator (const cp_declarator *declarator)
7690 while (declarator && declarator->kind != cdk_id)
7691 declarator = declarator->declarator;
7693 /* If the declarator-id is a SCOPE_REF, the scope in which the
7694 declaration occurs is the first operand. */
7696 && declarator->u.id.qualifying_scope)
7697 return declarator->u.id.qualifying_scope;
7699 /* Otherwise, the declarator is not a qualified name; the entity will
7700 be declared in the current scope. */
7704 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
7705 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
7709 create_array_type_for_decl (tree name, tree type, tree size)
7711 tree itype = NULL_TREE;
7713 /* If things have already gone awry, bail now. */
7714 if (type == error_mark_node || size == error_mark_node)
7715 return error_mark_node;
7717 /* If there are some types which cannot be array elements,
7718 issue an error-message and return. */
7719 switch (TREE_CODE (type))
7723 error ("declaration of %qD as array of void", name);
7725 error ("creating array of void");
7726 return error_mark_node;
7730 error ("declaration of %qD as array of functions", name);
7732 error ("creating array of functions");
7733 return error_mark_node;
7735 case REFERENCE_TYPE:
7737 error ("declaration of %qD as array of references", name);
7739 error ("creating array of references");
7740 return error_mark_node;
7744 error ("declaration of %qD as array of function members", name);
7746 error ("creating array of function members");
7747 return error_mark_node;
7755 The constant expressions that specify the bounds of the arrays
7756 can be omitted only for the first member of the sequence. */
7757 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
7760 error ("declaration of %qD as multidimensional array must "
7761 "have bounds for all dimensions except the first",
7764 error ("multidimensional array must have bounds for all "
7765 "dimensions except the first");
7767 return error_mark_node;
7770 /* Figure out the index type for the array. */
7772 itype = compute_array_index_type (name, size, tf_warning_or_error);
7775 T is called the array element type; this type shall not be [...] an
7776 abstract class type. */
7777 abstract_virtuals_error (name, type);
7779 return build_cplus_array_type (type, itype);
7782 /* Check that it's OK to declare a function with the indicated TYPE.
7783 SFK indicates the kind of special function (if any) that this
7784 function is. OPTYPE is the type given in a conversion operator
7785 declaration, or the class type for a constructor/destructor.
7786 Returns the actual return type of the function; that
7787 may be different than TYPE if an error occurs, or for certain
7788 special functions. */
7791 check_special_function_return_type (special_function_kind sfk,
7797 case sfk_constructor:
7799 error ("return type specification for constructor invalid");
7801 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7802 type = build_pointer_type (optype);
7804 type = void_type_node;
7807 case sfk_destructor:
7809 error ("return type specification for destructor invalid");
7810 /* We can't use the proper return type here because we run into
7811 problems with ambiguous bases and covariant returns.
7812 Java classes are left unchanged because (void *) isn't a valid
7813 Java type, and we don't want to change the Java ABI. */
7814 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7815 type = build_pointer_type (void_type_node);
7817 type = void_type_node;
7820 case sfk_conversion:
7822 error ("return type specified for %<operator %T%>", optype);
7833 /* A variable or data member (whose unqualified name is IDENTIFIER)
7834 has been declared with the indicated TYPE. If the TYPE is not
7835 acceptable, issue an error message and return a type to use for
7836 error-recovery purposes. */
7839 check_var_type (tree identifier, tree type)
7841 if (VOID_TYPE_P (type))
7844 error ("unnamed variable or field declared void");
7845 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
7847 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
7848 error ("variable or field %qE declared void", identifier);
7851 error ("variable or field declared void");
7852 type = error_mark_node;
7858 /* Given declspecs and a declarator (abstract or otherwise), determine
7859 the name and type of the object declared and construct a DECL node
7862 DECLSPECS points to the representation of declaration-specifier
7863 sequence that precedes declarator.
7865 DECL_CONTEXT says which syntactic context this declaration is in:
7866 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
7867 FUNCDEF for a function definition. Like NORMAL but a few different
7868 error messages in each case. Return value may be zero meaning
7869 this definition is too screwy to try to parse.
7870 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
7871 handle member functions (which have FIELD context).
7872 Return value may be zero meaning this definition is too screwy to
7874 PARM for a parameter declaration (either within a function prototype
7875 or before a function body). Make a PARM_DECL, or return void_type_node.
7876 TPARM for a template parameter declaration.
7877 CATCHPARM for a parameter declaration before a catch clause.
7878 TYPENAME if for a typename (in a cast or sizeof).
7879 Don't make a DECL node; just return the ..._TYPE node.
7880 FIELD for a struct or union field; make a FIELD_DECL.
7881 BITFIELD for a field with specified width.
7883 INITIALIZED is as for start_decl.
7885 ATTRLIST is a pointer to the list of attributes, which may be NULL
7886 if there are none; *ATTRLIST may be modified if attributes from inside
7887 the declarator should be applied to the declaration.
7889 When this function is called, scoping variables (such as
7890 CURRENT_CLASS_TYPE) should reflect the scope in which the
7891 declaration occurs, not the scope in which the new declaration will
7892 be placed. For example, on:
7896 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
7899 Returns a DECL (if a declarator is present), a TYPE (if there is no
7900 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
7904 grokdeclarator (const cp_declarator *declarator,
7905 const cp_decl_specifier_seq *declspecs,
7906 enum decl_context decl_context,
7910 tree type = NULL_TREE;
7912 int explicit_int128 = 0;
7913 int virtualp, explicitp, friendp, inlinep, staticp;
7914 int explicit_int = 0;
7915 int explicit_char = 0;
7916 int defaulted_int = 0;
7917 tree dependent_name = NULL_TREE;
7919 tree typedef_decl = NULL_TREE;
7920 const char *name = NULL;
7921 tree typedef_type = NULL_TREE;
7922 /* True if this declarator is a function definition. */
7923 bool funcdef_flag = false;
7924 cp_declarator_kind innermost_code = cdk_error;
7927 /* See the code below that used this. */
7928 tree decl_attr = NULL_TREE;
7931 /* Keep track of what sort of function is being processed
7932 so that we can warn about default return values, or explicit
7933 return values which do not match prescribed defaults. */
7934 special_function_kind sfk = sfk_none;
7936 tree dname = NULL_TREE;
7937 tree ctor_return_type = NULL_TREE;
7938 enum overload_flags flags = NO_SPECIAL;
7939 /* cv-qualifiers that apply to the declarator, for a declaration of
7940 a member function. */
7941 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
7942 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
7944 tree raises = NULL_TREE;
7945 int template_count = 0;
7946 tree returned_attrs = NULL_TREE;
7947 tree parms = NULL_TREE;
7948 const cp_declarator *id_declarator;
7949 /* The unqualified name of the declarator; either an
7950 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
7951 tree unqualified_id;
7952 /* The class type, if any, in which this entity is located,
7953 or NULL_TREE if none. Note that this value may be different from
7954 the current class type; for example if an attempt is made to declare
7955 "A::f" inside "B", this value will be "A". */
7956 tree ctype = current_class_type;
7957 /* The NAMESPACE_DECL for the namespace in which this entity is
7958 located. If an unqualified name is used to declare the entity,
7959 this value will be NULL_TREE, even if the entity is located at
7961 tree in_namespace = NULL_TREE;
7962 cp_storage_class storage_class;
7963 bool unsigned_p, signed_p, short_p, long_p, thread_p;
7964 bool type_was_error_mark_node = false;
7965 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
7966 bool template_type_arg = false;
7967 bool template_parm_flag = false;
7968 bool constexpr_p = declspecs->specs[(int) ds_constexpr];
7971 signed_p = declspecs->specs[(int)ds_signed];
7972 unsigned_p = declspecs->specs[(int)ds_unsigned];
7973 short_p = declspecs->specs[(int)ds_short];
7974 long_p = declspecs->specs[(int)ds_long];
7975 longlong = declspecs->specs[(int)ds_long] >= 2;
7976 explicit_int128 = declspecs->explicit_int128_p;
7977 thread_p = declspecs->specs[(int)ds_thread];
7979 if (decl_context == FUNCDEF)
7980 funcdef_flag = true, decl_context = NORMAL;
7981 else if (decl_context == MEMFUNCDEF)
7982 funcdef_flag = true, decl_context = FIELD;
7983 else if (decl_context == BITFIELD)
7984 bitfield = 1, decl_context = FIELD;
7985 else if (decl_context == TEMPLATE_TYPE_ARG)
7986 template_type_arg = true, decl_context = TYPENAME;
7987 else if (decl_context == TPARM)
7988 template_parm_flag = true, decl_context = PARM;
7990 if (initialized > 1)
7991 funcdef_flag = true;
7993 /* Look inside a declarator for the name being declared
7994 and get it as a string, for an error message. */
7995 for (id_declarator = declarator;
7997 id_declarator = id_declarator->declarator)
7999 if (id_declarator->kind != cdk_id)
8000 innermost_code = id_declarator->kind;
8002 switch (id_declarator->kind)
8005 if (id_declarator->declarator
8006 && id_declarator->declarator->kind == cdk_id)
8008 sfk = id_declarator->declarator->u.id.sfk;
8009 if (sfk == sfk_destructor)
8016 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
8017 tree decl = id_declarator->u.id.unqualified_name;
8020 if (qualifying_scope)
8022 if (at_function_scope_p ())
8026 A declarator-id shall not be qualified except
8029 None of the cases are permitted in block
8031 if (qualifying_scope == global_namespace)
8032 error ("invalid use of qualified-name %<::%D%>",
8034 else if (TYPE_P (qualifying_scope))
8035 error ("invalid use of qualified-name %<%T::%D%>",
8036 qualifying_scope, decl);
8038 error ("invalid use of qualified-name %<%D::%D%>",
8039 qualifying_scope, decl);
8040 return error_mark_node;
8042 else if (TYPE_P (qualifying_scope))
8044 ctype = qualifying_scope;
8045 if (innermost_code != cdk_function
8046 && current_class_type
8047 && !UNIQUELY_DERIVED_FROM_P (ctype,
8048 current_class_type))
8050 error ("type %qT is not derived from type %qT",
8051 ctype, current_class_type);
8052 return error_mark_node;
8055 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
8056 in_namespace = qualifying_scope;
8058 switch (TREE_CODE (decl))
8064 if (innermost_code != cdk_function)
8066 error ("declaration of %qD as non-function", decl);
8067 return error_mark_node;
8069 else if (!qualifying_scope
8070 && !(current_class_type && at_class_scope_p ()))
8072 error ("declaration of %qD as non-member", decl);
8073 return error_mark_node;
8076 type = TREE_OPERAND (decl, 0);
8078 type = constructor_name (type);
8079 name = identifier_to_locale (IDENTIFIER_POINTER (type));
8084 case TEMPLATE_ID_EXPR:
8086 tree fns = TREE_OPERAND (decl, 0);
8089 if (TREE_CODE (dname) != IDENTIFIER_NODE)
8091 gcc_assert (is_overloaded_fn (dname));
8092 dname = DECL_NAME (get_first_fn (dname));
8097 case IDENTIFIER_NODE:
8098 if (TREE_CODE (decl) == IDENTIFIER_NODE)
8101 if (C_IS_RESERVED_WORD (dname))
8103 error ("declarator-id missing; using reserved word %qD",
8105 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8107 else if (!IDENTIFIER_TYPENAME_P (dname))
8108 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8111 gcc_assert (flags == NO_SPECIAL);
8112 flags = TYPENAME_FLAG;
8113 ctor_return_type = TREE_TYPE (dname);
8114 sfk = sfk_conversion;
8115 if (is_typename_at_global_scope (dname))
8116 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8118 name = "<invalid operator>";
8135 return error_mark_node;
8140 if (id_declarator->kind == cdk_id)
8146 The declarator in a function-definition shall have the form
8147 D1 ( parameter-declaration-clause) ... */
8148 if (funcdef_flag && innermost_code != cdk_function)
8150 error ("function definition does not declare parameters");
8151 return error_mark_node;
8154 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
8155 && innermost_code != cdk_function
8156 && ! (ctype && !declspecs->any_specifiers_p))
8158 error ("declaration of %qD as non-function", dname);
8159 return error_mark_node;
8162 /* Anything declared one level down from the top level
8163 must be one of the parameters of a function
8164 (because the body is at least two levels down). */
8166 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
8167 by not allowing C++ class definitions to specify their parameters
8168 with xdecls (must be spec.d in the parmlist).
8170 Since we now wait to push a class scope until we are sure that
8171 we are in a legitimate method context, we must set oldcname
8172 explicitly (since current_class_name is not yet alive).
8174 We also want to avoid calling this a PARM if it is in a namespace. */
8176 if (decl_context == NORMAL && !toplevel_bindings_p ())
8178 struct cp_binding_level *b = current_binding_level;
8179 current_binding_level = b->level_chain;
8180 if (current_binding_level != 0 && toplevel_bindings_p ())
8181 decl_context = PARM;
8182 current_binding_level = b;
8186 name = decl_context == PARM ? "parameter" : "type name";
8188 if (constexpr_p && declspecs->specs[(int)ds_typedef])
8190 error ("%<constexpr%> cannot appear in a typedef declaration");
8191 return error_mark_node;
8194 /* If there were multiple types specified in the decl-specifier-seq,
8195 issue an error message. */
8196 if (declspecs->multiple_types_p)
8198 error ("two or more data types in declaration of %qs", name);
8199 return error_mark_node;
8202 if (declspecs->conflicting_specifiers_p)
8204 error ("conflicting specifiers in declaration of %qs", name);
8205 return error_mark_node;
8208 /* Extract the basic type from the decl-specifier-seq. */
8209 type = declspecs->type;
8210 if (type == error_mark_node)
8213 type_was_error_mark_node = true;
8215 /* If the entire declaration is itself tagged as deprecated then
8216 suppress reports of deprecated items. */
8217 if (type && TREE_DEPRECATED (type)
8218 && deprecated_state != DEPRECATED_SUPPRESS)
8219 warn_deprecated_use (type, NULL_TREE);
8220 if (type && TREE_CODE (type) == TYPE_DECL)
8222 typedef_decl = type;
8223 type = TREE_TYPE (typedef_decl);
8224 if (TREE_DEPRECATED (type)
8225 && DECL_ARTIFICIAL (typedef_decl)
8226 && deprecated_state != DEPRECATED_SUPPRESS)
8227 warn_deprecated_use (type, NULL_TREE);
8229 /* No type at all: default to `int', and set DEFAULTED_INT
8230 because it was not a user-defined typedef. */
8231 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
8233 /* These imply 'int'. */
8234 type = integer_type_node;
8238 explicit_int = declspecs->explicit_int_p;
8239 explicit_char = declspecs->explicit_char_p;
8242 /* See the code below that used this. */
8244 decl_attr = DECL_ATTRIBUTES (typedef_decl);
8246 typedef_type = type;
8249 if (sfk != sfk_conversion)
8250 ctor_return_type = ctype;
8252 if (sfk != sfk_none)
8253 type = check_special_function_return_type (sfk, type,
8255 else if (type == NULL_TREE)
8261 /* We handle `main' specially here, because 'main () { }' is so
8262 common. With no options, it is allowed. With -Wreturn-type,
8263 it is a warning. It is only an error with -pedantic-errors. */
8264 is_main = (funcdef_flag
8265 && dname && TREE_CODE (dname) == IDENTIFIER_NODE
8266 && MAIN_NAME_P (dname)
8267 && ctype == NULL_TREE
8268 && in_namespace == NULL_TREE
8269 && current_namespace == global_namespace);
8271 if (type_was_error_mark_node)
8272 /* We've already issued an error, don't complain more. */;
8273 else if (in_system_header || flag_ms_extensions)
8274 /* Allow it, sigh. */;
8276 permerror (input_location, "ISO C++ forbids declaration of %qs with no type", name);
8278 pedwarn (input_location, OPT_pedantic,
8279 "ISO C++ forbids declaration of %qs with no type", name);
8281 warning (OPT_Wreturn_type,
8282 "ISO C++ forbids declaration of %qs with no type", name);
8284 type = integer_type_node;
8289 /* Now process the modifiers that were specified
8290 and check for invalid combinations. */
8292 /* Long double is a special combination. */
8293 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
8296 type = cp_build_qualified_type (long_double_type_node,
8297 cp_type_quals (type));
8300 /* Check all other uses of type modifiers. */
8302 if (unsigned_p || signed_p || long_p || short_p)
8306 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
8307 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8308 else if (signed_p && unsigned_p)
8309 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
8310 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
8311 error ("%<long long%> invalid for %qs", name);
8312 else if (explicit_int128 && TREE_CODE (type) != INTEGER_TYPE)
8313 error ("%<__int128%> invalid for %qs", name);
8314 else if (long_p && TREE_CODE (type) == REAL_TYPE)
8315 error ("%<long%> invalid for %qs", name);
8316 else if (short_p && TREE_CODE (type) == REAL_TYPE)
8317 error ("%<short%> invalid for %qs", name);
8318 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
8319 error ("%<long%> or %<short%> invalid for %qs", name);
8320 else if ((long_p || short_p || explicit_char || explicit_int) && explicit_int128)
8321 error ("%<long%>, %<int%>, %<short%>, or %<char%> invalid for %qs", name);
8322 else if ((long_p || short_p) && explicit_char)
8323 error ("%<long%> or %<short%> specified with char for %qs", name);
8324 else if (long_p && short_p)
8325 error ("%<long%> and %<short%> specified together for %qs", name);
8326 else if (type == char16_type_node || type == char32_type_node)
8328 if (signed_p || unsigned_p)
8329 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8330 else if (short_p || long_p)
8331 error ("%<short%> or %<long%> invalid for %qs", name);
8336 if (!explicit_int && !defaulted_int && !explicit_char && !explicit_int128 && pedantic)
8338 pedwarn (input_location, OPT_pedantic,
8339 "long, short, signed or unsigned used invalidly for %qs",
8341 if (flag_pedantic_errors)
8344 if (explicit_int128)
8346 if (int128_integer_type_node == NULL_TREE)
8348 error ("%<__int128%> is not supported by this target");
8353 pedwarn (input_location, OPT_pedantic,
8354 "ISO C++ does not support %<__int128%> for %qs",
8356 if (flag_pedantic_errors)
8362 /* Discard the type modifiers if they are invalid. */
8370 explicit_int128 = false;
8374 /* Decide whether an integer type is signed or not.
8375 Optionally treat bitfields as signed by default. */
8379 It is implementation-defined whether a plain (neither
8380 explicitly signed or unsigned) char, short, int, or long
8381 bit-field is signed or unsigned.
8383 Naturally, we extend this to long long as well. Note that
8384 this does not include wchar_t. */
8385 || (bitfield && !flag_signed_bitfields
8387 /* A typedef for plain `int' without `signed' can be
8388 controlled just like plain `int', but a typedef for
8389 `signed int' cannot be so controlled. */
8391 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
8392 && TREE_CODE (type) == INTEGER_TYPE
8393 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
8395 if (explicit_int128)
8396 type = int128_unsigned_type_node;
8398 type = long_long_unsigned_type_node;
8400 type = long_unsigned_type_node;
8402 type = short_unsigned_type_node;
8403 else if (type == char_type_node)
8404 type = unsigned_char_type_node;
8405 else if (typedef_decl)
8406 type = unsigned_type_for (type);
8408 type = unsigned_type_node;
8410 else if (signed_p && type == char_type_node)
8411 type = signed_char_type_node;
8412 else if (explicit_int128)
8413 type = int128_integer_type_node;
8415 type = long_long_integer_type_node;
8417 type = long_integer_type_node;
8419 type = short_integer_type_node;
8421 if (declspecs->specs[(int)ds_complex])
8423 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
8424 error ("complex invalid for %qs", name);
8425 /* If we just have "complex", it is equivalent to
8426 "complex double", but if any modifiers at all are specified it is
8427 the complex form of TYPE. E.g, "complex short" is
8428 "complex short int". */
8429 else if (defaulted_int && ! longlong && ! explicit_int128
8430 && ! (long_p || short_p || signed_p || unsigned_p))
8431 type = complex_double_type_node;
8432 else if (type == integer_type_node)
8433 type = complex_integer_type_node;
8434 else if (type == float_type_node)
8435 type = complex_float_type_node;
8436 else if (type == double_type_node)
8437 type = complex_double_type_node;
8438 else if (type == long_double_type_node)
8439 type = complex_long_double_type_node;
8441 type = build_complex_type (type);
8444 type_quals = TYPE_UNQUALIFIED;
8445 if (declspecs->specs[(int)ds_const])
8446 type_quals |= TYPE_QUAL_CONST;
8447 if (declspecs->specs[(int)ds_volatile])
8448 type_quals |= TYPE_QUAL_VOLATILE;
8449 if (declspecs->specs[(int)ds_restrict])
8450 type_quals |= TYPE_QUAL_RESTRICT;
8451 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
8452 error ("qualifiers are not allowed on declaration of %<operator %T%>",
8455 type_quals |= cp_type_quals (type);
8456 type = cp_build_qualified_type_real
8457 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
8458 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
8459 /* We might have ignored or rejected some of the qualifiers. */
8460 type_quals = cp_type_quals (type);
8463 inlinep = !! declspecs->specs[(int)ds_inline];
8464 virtualp = !! declspecs->specs[(int)ds_virtual];
8465 explicitp = !! declspecs->specs[(int)ds_explicit];
8467 storage_class = declspecs->storage_class;
8468 if (storage_class == sc_static)
8469 staticp = 1 + (decl_context == FIELD);
8471 if (virtualp && staticp == 2)
8473 error ("member %qD cannot be declared both virtual and static", dname);
8474 storage_class = sc_none;
8477 friendp = !! declspecs->specs[(int)ds_friend];
8479 if (dependent_name && !friendp)
8481 error ("%<%T::%D%> is not a valid declarator", ctype, dependent_name);
8482 return error_mark_node;
8485 /* Issue errors about use of storage classes for parameters. */
8486 if (decl_context == PARM)
8488 if (declspecs->specs[(int)ds_typedef])
8490 error ("typedef declaration invalid in parameter declaration");
8491 return error_mark_node;
8493 else if (template_parm_flag && storage_class != sc_none)
8495 error ("storage class specified for template parameter %qs", name);
8496 return error_mark_node;
8498 else if (storage_class == sc_static
8499 || storage_class == sc_extern
8501 error ("storage class specifiers invalid in parameter declarations");
8503 if (type_uses_auto (type))
8505 error ("parameter declared %<auto%>");
8506 type = error_mark_node;
8509 /* Function parameters cannot be constexpr. If we saw one, moan
8510 and pretend it wasn't there. */
8513 error ("a parameter cannot be declared %<constexpr%>");
8518 /* Give error if `virtual' is used outside of class declaration. */
8520 && (current_class_name == NULL_TREE || decl_context != FIELD))
8522 error ("%<virtual%> outside class declaration");
8526 /* Static anonymous unions are dealt with here. */
8527 if (staticp && decl_context == TYPENAME
8529 && ANON_AGGR_TYPE_P (declspecs->type))
8530 decl_context = FIELD;
8532 /* Warn about storage classes that are invalid for certain
8533 kinds of declarations (parameters, typenames, etc.). */
8536 && storage_class != sc_extern
8537 && storage_class != sc_static)
8538 || declspecs->specs[(int)ds_typedef]))
8540 error ("multiple storage classes in declaration of %qs", name);
8543 if (decl_context != NORMAL
8544 && ((storage_class != sc_none
8545 && storage_class != sc_mutable)
8548 if ((decl_context == PARM || decl_context == CATCHPARM)
8549 && (storage_class == sc_register
8550 || storage_class == sc_auto))
8552 else if (declspecs->specs[(int)ds_typedef])
8554 else if (decl_context == FIELD
8555 /* C++ allows static class elements. */
8556 && storage_class == sc_static)
8557 /* C++ also allows inlines and signed and unsigned elements,
8558 but in those cases we don't come in here. */
8562 if (decl_context == FIELD)
8563 error ("storage class specified for %qs", name);
8566 if (decl_context == PARM || decl_context == CATCHPARM)
8567 error ("storage class specified for parameter %qs", name);
8569 error ("storage class specified for typename");
8571 if (storage_class == sc_register
8572 || storage_class == sc_auto
8573 || storage_class == sc_extern
8575 storage_class = sc_none;
8578 else if (storage_class == sc_extern && funcdef_flag
8579 && ! toplevel_bindings_p ())
8580 error ("nested function %qs declared %<extern%>", name);
8581 else if (toplevel_bindings_p ())
8583 if (storage_class == sc_auto)
8584 error ("top-level declaration of %qs specifies %<auto%>", name);
8587 && storage_class != sc_extern
8588 && storage_class != sc_static)
8590 error ("function-scope %qs implicitly auto and declared %<__thread%>",
8595 if (storage_class && friendp)
8597 error ("storage class specifiers invalid in friend function declarations");
8598 storage_class = sc_none;
8603 unqualified_id = NULL_TREE;
8606 unqualified_id = id_declarator->u.id.unqualified_name;
8607 switch (TREE_CODE (unqualified_id))
8610 unqualified_id = TREE_OPERAND (unqualified_id, 0);
8611 if (TYPE_P (unqualified_id))
8612 unqualified_id = constructor_name (unqualified_id);
8615 case IDENTIFIER_NODE:
8616 case TEMPLATE_ID_EXPR:
8624 /* Determine the type of the entity declared by recurring on the
8626 for (; declarator; declarator = declarator->declarator)
8628 const cp_declarator *inner_declarator;
8631 if (type == error_mark_node)
8632 return error_mark_node;
8634 attrs = declarator->attributes;
8640 if (declarator == NULL || declarator->kind == cdk_id)
8641 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
8642 if (declarator->kind == cdk_function)
8643 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
8644 if (declarator->kind == cdk_array)
8645 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
8646 returned_attrs = decl_attributes (&type,
8647 chainon (returned_attrs, attrs),
8651 if (declarator->kind == cdk_id)
8654 inner_declarator = declarator->declarator;
8656 switch (declarator->kind)
8659 type = create_array_type_for_decl (dname, type,
8660 declarator->u.array.bounds);
8668 /* Declaring a function type.
8669 Make sure we have a valid type for the function to return. */
8671 if (type_quals != TYPE_UNQUALIFIED)
8673 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
8674 warning (OPT_Wignored_qualifiers,
8675 "type qualifiers ignored on function return type");
8676 /* We now know that the TYPE_QUALS don't apply to the
8677 decl, but to its return type. */
8678 type_quals = TYPE_UNQUALIFIED;
8680 errmsg = targetm.invalid_return_type (type);
8684 type = integer_type_node;
8687 /* Error about some types functions can't return. */
8689 if (TREE_CODE (type) == FUNCTION_TYPE)
8691 error ("%qs declared as function returning a function", name);
8692 return error_mark_node;
8694 if (TREE_CODE (type) == ARRAY_TYPE)
8696 error ("%qs declared as function returning an array", name);
8697 return error_mark_node;
8700 /* Pick up type qualifiers which should be applied to `this'. */
8701 memfn_quals = declarator->u.function.qualifiers;
8703 /* Pick up the exception specifications. */
8704 raises = declarator->u.function.exception_specification;
8706 /* Say it's a definition only for the CALL_EXPR
8707 closest to the identifier. */
8708 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
8710 /* Handle a late-specified return type. */
8713 if (type_uses_auto (type))
8715 if (!declarator->u.function.late_return_type)
8717 error ("%qs function uses %<auto%> type specifier without"
8718 " late return type", name);
8719 return error_mark_node;
8721 else if (!is_auto (type))
8723 error ("%qs function with late return type has"
8724 " %qT as its type rather than plain %<auto%>",
8726 return error_mark_node;
8729 else if (declarator->u.function.late_return_type)
8731 error ("%qs function with late return type not declared"
8732 " with %<auto%> type specifier", name);
8733 return error_mark_node;
8736 type = splice_late_return_type
8737 (type, declarator->u.function.late_return_type);
8738 if (type == error_mark_node)
8739 return error_mark_node;
8741 if (ctype == NULL_TREE
8742 && decl_context == FIELD
8744 && (friendp == 0 || dname == current_class_name))
8745 ctype = current_class_type;
8747 if (ctype && (sfk == sfk_constructor
8748 || sfk == sfk_destructor))
8750 /* We are within a class's scope. If our declarator name
8751 is the same as the class name, and we are defining
8752 a function, then it is a constructor/destructor, and
8753 therefore returns a void type. */
8755 /* ISO C++ 12.4/2. A destructor may not be declared
8756 const or volatile. A destructor may not be
8759 ISO C++ 12.1. A constructor may not be declared
8760 const or volatile. A constructor may not be
8761 virtual. A constructor may not be static. */
8763 error ((flags == DTOR_FLAG)
8764 ? "destructor cannot be static member function"
8765 : "constructor cannot be static member function");
8768 error ((flags == DTOR_FLAG)
8769 ? "destructors may not be cv-qualified"
8770 : "constructors may not be cv-qualified");
8771 memfn_quals = TYPE_UNQUALIFIED;
8774 if (decl_context == FIELD
8775 && !member_function_or_else (ctype,
8778 return error_mark_node;
8780 if (flags != DTOR_FLAG)
8782 /* It's a constructor. */
8787 permerror (input_location, "constructors cannot be declared virtual");
8790 if (decl_context == FIELD
8791 && sfk != sfk_constructor)
8792 return error_mark_node;
8794 if (decl_context == FIELD)
8800 error ("can%'t initialize friend function %qs", name);
8803 /* Cannot be both friend and virtual. */
8804 error ("virtual functions cannot be friends");
8807 if (decl_context == NORMAL)
8808 error ("friend declaration not in class definition");
8809 if (current_function_decl && funcdef_flag)
8810 error ("can%'t define friend function %qs in a local "
8814 else if (ctype && sfk == sfk_conversion)
8818 maybe_warn_cpp0x (CPP0X_EXPLICIT_CONVERSION);
8823 arg_types = grokparms (declarator->u.function.parameters,
8826 if (inner_declarator
8827 && inner_declarator->kind == cdk_id
8828 && inner_declarator->u.id.sfk == sfk_destructor
8829 && arg_types != void_list_node)
8831 error ("destructors may not have parameters");
8832 arg_types = void_list_node;
8836 type = build_function_type (type, arg_types);
8843 /* Filter out pointers-to-references and references-to-references.
8844 We can get these if a TYPE_DECL is used. */
8846 if (TREE_CODE (type) == REFERENCE_TYPE)
8848 if (declarator->kind != cdk_reference)
8850 error ("cannot declare pointer to %q#T", type);
8851 type = TREE_TYPE (type);
8854 /* In C++0x, we allow reference to reference declarations
8855 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
8856 and template type arguments [14.3.1/4 temp.arg.type]. The
8857 check for direct reference to reference declarations, which
8858 are still forbidden, occurs below. Reasoning behind the change
8859 can be found in DR106, DR540, and the rvalue reference
8861 else if (cxx_dialect == cxx98)
8863 error ("cannot declare reference to %q#T", type);
8864 type = TREE_TYPE (type);
8867 else if (VOID_TYPE_P (type))
8869 if (declarator->kind == cdk_reference)
8870 error ("cannot declare reference to %q#T", type);
8871 else if (declarator->kind == cdk_ptrmem)
8872 error ("cannot declare pointer to %q#T member", type);
8875 /* We now know that the TYPE_QUALS don't apply to the decl,
8876 but to the target of the pointer. */
8877 type_quals = TYPE_UNQUALIFIED;
8879 if (declarator->kind == cdk_ptrmem
8880 && (TREE_CODE (type) == FUNCTION_TYPE
8881 || (memfn_quals && TREE_CODE (type) == METHOD_TYPE)))
8883 memfn_quals |= type_memfn_quals (type);
8884 type = build_memfn_type (type,
8885 declarator->u.pointer.class_type,
8887 if (type == error_mark_node)
8888 return error_mark_node;
8889 memfn_quals = TYPE_UNQUALIFIED;
8892 if (TREE_CODE (type) == FUNCTION_TYPE
8893 && type_memfn_quals (type) != TYPE_UNQUALIFIED)
8894 error (declarator->kind == cdk_reference
8895 ? G_("cannot declare reference to qualified function type %qT")
8896 : G_("cannot declare pointer to qualified function type %qT"),
8899 /* When the pointed-to type involves components of variable size,
8900 care must be taken to ensure that the size evaluation code is
8901 emitted early enough to dominate all the possible later uses
8902 and late enough for the variables on which it depends to have
8905 This is expected to happen automatically when the pointed-to
8906 type has a name/declaration of it's own, but special attention
8907 is required if the type is anonymous.
8909 We handle the NORMAL and FIELD contexts here by inserting a
8910 dummy statement that just evaluates the size at a safe point
8911 and ensures it is not deferred until e.g. within a deeper
8912 conditional context (c++/43555).
8914 We expect nothing to be needed here for PARM or TYPENAME.
8915 Evaluating the size at this point for TYPENAME would
8916 actually be incorrect, as we might be in the middle of an
8917 expression with side effects on the pointed-to type size
8918 "arguments" prior to the pointer declaration point and the
8919 size evaluation could end up prior to the side effects. */
8921 if (!TYPE_NAME (type)
8922 && (decl_context == NORMAL || decl_context == FIELD)
8923 && at_function_scope_p ()
8924 && variably_modified_type_p (type, NULL_TREE))
8925 finish_expr_stmt (TYPE_SIZE (type));
8927 if (declarator->kind == cdk_reference)
8929 /* In C++0x, the type we are creating a reference to might be
8930 a typedef which is itself a reference type. In that case,
8931 we follow the reference collapsing rules in
8932 [7.1.3/8 dcl.typedef] to create the final reference type:
8934 "If a typedef TD names a type that is a reference to a type
8935 T, an attempt to create the type 'lvalue reference to cv TD'
8936 creates the type 'lvalue reference to T,' while an attempt
8937 to create the type "rvalue reference to cv TD' creates the
8940 if (!VOID_TYPE_P (type))
8941 type = cp_build_reference_type
8942 ((TREE_CODE (type) == REFERENCE_TYPE
8943 ? TREE_TYPE (type) : type),
8944 (declarator->u.reference.rvalue_ref
8945 && (TREE_CODE(type) != REFERENCE_TYPE
8946 || TYPE_REF_IS_RVALUE (type))));
8948 /* In C++0x, we need this check for direct reference to
8949 reference declarations, which are forbidden by
8950 [8.3.2/5 dcl.ref]. Reference to reference declarations
8951 are only allowed indirectly through typedefs and template
8952 type arguments. Example:
8954 void foo(int & &); // invalid ref-to-ref decl
8956 typedef int & int_ref;
8957 void foo(int_ref &); // valid ref-to-ref decl
8959 if (inner_declarator && inner_declarator->kind == cdk_reference)
8960 error ("cannot declare reference to %q#T, which is not "
8961 "a typedef or a template type argument", type);
8963 else if (TREE_CODE (type) == METHOD_TYPE)
8964 type = build_ptrmemfunc_type (build_pointer_type (type));
8965 else if (declarator->kind == cdk_ptrmem)
8967 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
8969 if (declarator->u.pointer.class_type == error_mark_node)
8970 /* We will already have complained. */
8971 type = error_mark_node;
8973 type = build_ptrmem_type (declarator->u.pointer.class_type,
8977 type = build_pointer_type (type);
8979 /* Process a list of type modifier keywords (such as
8980 const or volatile) that were given inside the `*' or `&'. */
8982 if (declarator->u.pointer.qualifiers)
8985 = cp_build_qualified_type (type,
8986 declarator->u.pointer.qualifiers);
8987 type_quals = cp_type_quals (type);
9000 /* A `constexpr' specifier used in an object declaration declares
9001 the object as `const'. */
9002 if (constexpr_p && innermost_code != cdk_function)
9004 if (type_quals & TYPE_QUAL_CONST)
9005 error ("both %<const%> and %<constexpr%> cannot be used here");
9006 if (type_quals & TYPE_QUAL_VOLATILE)
9007 error ("both %<volatile%> and %<constexpr%> cannot be used here");
9008 type_quals |= TYPE_QUAL_CONST;
9009 type = cp_build_qualified_type (type, type_quals);
9012 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
9013 && TREE_CODE (type) != FUNCTION_TYPE
9014 && TREE_CODE (type) != METHOD_TYPE)
9016 error ("template-id %qD used as a declarator",
9018 unqualified_id = dname;
9021 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
9022 qualified with a class-name, turn it into a METHOD_TYPE, unless
9023 we know that the function is static. We take advantage of this
9024 opportunity to do other processing that pertains to entities
9025 explicitly declared to be class members. Note that if DECLARATOR
9026 is non-NULL, we know it is a cdk_id declarator; otherwise, we
9027 would not have exited the loop above. */
9029 && declarator->u.id.qualifying_scope
9030 && TYPE_P (declarator->u.id.qualifying_scope))
9034 ctype = declarator->u.id.qualifying_scope;
9035 ctype = TYPE_MAIN_VARIANT (ctype);
9037 while (t != NULL_TREE && CLASS_TYPE_P (t))
9039 /* You're supposed to have one `template <...>' for every
9040 template class, but you don't need one for a full
9041 specialization. For example:
9043 template <class T> struct S{};
9044 template <> struct S<int> { void f(); };
9045 void S<int>::f () {}
9047 is correct; there shouldn't be a `template <>' for the
9048 definition of `S<int>::f'. */
9049 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
9050 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
9051 /* T is an explicit (not partial) specialization. All
9052 containing classes must therefore also be explicitly
9055 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
9056 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
9057 template_count += 1;
9059 t = TYPE_MAIN_DECL (t);
9060 t = DECL_CONTEXT (t);
9063 if (ctype == current_class_type)
9067 permerror (input_location, "member functions are implicitly friends of their class");
9071 permerror (declarator->id_loc,
9072 "extra qualification %<%T::%> on member %qs",
9075 else if (/* If the qualifying type is already complete, then we
9076 can skip the following checks. */
9077 !COMPLETE_TYPE_P (ctype)
9078 && (/* If the function is being defined, then
9079 qualifying type must certainly be complete. */
9081 /* A friend declaration of "T::f" is OK, even if
9082 "T" is a template parameter. But, if this
9083 function is not a friend, the qualifying type
9085 || (!friendp && !CLASS_TYPE_P (ctype))
9086 /* For a declaration, the type need not be
9087 complete, if either it is dependent (since there
9088 is no meaningful definition of complete in that
9089 case) or the qualifying class is currently being
9091 || !(dependent_type_p (ctype)
9092 || currently_open_class (ctype)))
9093 /* Check that the qualifying type is complete. */
9094 && !complete_type_or_else (ctype, NULL_TREE))
9095 return error_mark_node;
9096 else if (TREE_CODE (type) == FUNCTION_TYPE)
9098 if (current_class_type
9099 && (!friendp || funcdef_flag))
9102 ? "cannot define member function %<%T::%s%> within %<%T%>"
9103 : "cannot declare member function %<%T::%s%> within %<%T%>",
9104 ctype, name, current_class_type);
9105 return error_mark_node;
9108 else if (declspecs->specs[(int)ds_typedef]
9109 && current_class_type)
9111 error ("cannot declare member %<%T::%s%> within %qT",
9112 ctype, name, current_class_type);
9113 return error_mark_node;
9117 if (ctype == NULL_TREE && decl_context == FIELD && friendp == 0)
9118 ctype = current_class_type;
9120 /* A constexpr non-static member function is implicitly const. */
9121 if (constexpr_p && ctype && staticp == 0
9122 && TREE_CODE (type) == FUNCTION_TYPE
9123 && sfk != sfk_constructor && sfk != sfk_destructor)
9124 memfn_quals |= TYPE_QUAL_CONST;
9126 /* Now TYPE has the actual type. */
9131 *attrlist = chainon (returned_attrs, *attrlist);
9133 attrlist = &returned_attrs;
9136 /* Handle parameter packs. */
9137 if (parameter_pack_p)
9139 if (decl_context == PARM)
9140 /* Turn the type into a pack expansion.*/
9141 type = make_pack_expansion (type);
9143 error ("non-parameter %qs cannot be a parameter pack", name);
9146 /* Did array size calculations overflow? */
9148 if (TREE_CODE (type) == ARRAY_TYPE
9149 && COMPLETE_TYPE_P (type)
9150 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
9151 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
9153 error ("size of array %qs is too large", name);
9154 /* If we proceed with the array type as it is, we'll eventually
9155 crash in tree_low_cst(). */
9156 type = error_mark_node;
9159 if ((decl_context == FIELD || decl_context == PARM)
9160 && !processing_template_decl
9161 && variably_modified_type_p (type, NULL_TREE))
9163 if (decl_context == FIELD)
9164 error ("data member may not have variably modified type %qT", type);
9166 error ("parameter may not have variably modified type %qT", type);
9167 type = error_mark_node;
9170 if (explicitp == 1 || (explicitp && friendp))
9172 /* [dcl.fct.spec] The explicit specifier shall only be used in
9173 declarations of constructors within a class definition. */
9174 error ("only declarations of constructors can be %<explicit%>");
9178 if (storage_class == sc_mutable)
9180 if (decl_context != FIELD || friendp)
9182 error ("non-member %qs cannot be declared %<mutable%>", name);
9183 storage_class = sc_none;
9185 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
9187 error ("non-object member %qs cannot be declared %<mutable%>", name);
9188 storage_class = sc_none;
9190 else if (TREE_CODE (type) == FUNCTION_TYPE
9191 || TREE_CODE (type) == METHOD_TYPE)
9193 error ("function %qs cannot be declared %<mutable%>", name);
9194 storage_class = sc_none;
9198 error ("static %qs cannot be declared %<mutable%>", name);
9199 storage_class = sc_none;
9201 else if (type_quals & TYPE_QUAL_CONST)
9203 error ("const %qs cannot be declared %<mutable%>", name);
9204 storage_class = sc_none;
9208 /* If this is declaring a typedef name, return a TYPE_DECL. */
9209 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
9213 /* Note that the grammar rejects storage classes
9214 in typenames, fields or parameters. */
9215 if (current_lang_name == lang_name_java)
9216 TYPE_FOR_JAVA (type) = 1;
9218 /* This declaration:
9220 typedef void f(int) const;
9222 declares a function type which is not a member of any
9223 particular class, but which is cv-qualified; for
9224 example "f S::*" declares a pointer to a const-qualified
9225 member function of S. We record the cv-qualification in the
9227 if (memfn_quals && TREE_CODE (type) == FUNCTION_TYPE)
9229 type = apply_memfn_quals (type, memfn_quals);
9231 /* We have now dealt with these qualifiers. */
9232 memfn_quals = TYPE_UNQUALIFIED;
9235 if (decl_context == FIELD)
9236 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
9238 decl = build_decl (input_location, TYPE_DECL, unqualified_id, type);
9239 if (id_declarator && declarator->u.id.qualifying_scope) {
9240 error_at (DECL_SOURCE_LOCATION (decl),
9241 "typedef name may not be a nested-name-specifier");
9242 TREE_TYPE (decl) = error_mark_node;
9245 if (decl_context != FIELD)
9247 if (!current_function_decl)
9248 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
9249 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
9250 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
9251 (current_function_decl)))
9252 /* The TYPE_DECL is "abstract" because there will be
9253 clones of this constructor/destructor, and there will
9254 be copies of this TYPE_DECL generated in those
9256 DECL_ABSTRACT (decl) = 1;
9258 else if (constructor_name_p (unqualified_id, current_class_type))
9259 permerror (input_location, "ISO C++ forbids nested type %qD with same name "
9260 "as enclosing class",
9263 /* If the user declares "typedef struct {...} foo" then the
9264 struct will have an anonymous name. Fill that name in now.
9265 Nothing can refer to it, so nothing needs know about the name
9267 if (type != error_mark_node
9270 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
9271 && TYPE_ANONYMOUS_P (type)
9272 && cp_type_quals (type) == TYPE_UNQUALIFIED)
9276 /* Replace the anonymous name with the real name everywhere. */
9277 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
9279 if (ANON_AGGRNAME_P (TYPE_IDENTIFIER (t)))
9280 /* We do not rename the debug info representing the
9281 anonymous tagged type because the standard says in
9282 [dcl.typedef] that the naming applies only for
9283 linkage purposes. */
9284 /*debug_hooks->set_name (t, decl);*/
9285 TYPE_NAME (t) = decl;
9288 if (TYPE_LANG_SPECIFIC (type))
9289 TYPE_WAS_ANONYMOUS (type) = 1;
9291 /* If this is a typedef within a template class, the nested
9292 type is a (non-primary) template. The name for the
9293 template needs updating as well. */
9294 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
9295 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
9296 = TYPE_IDENTIFIER (type);
9298 /* Adjust linkage now that we aren't anonymous anymore. */
9299 set_linkage_according_to_type (type, TYPE_MAIN_DECL (type));
9300 determine_visibility (TYPE_MAIN_DECL (type));
9302 /* FIXME remangle member functions; member functions of a
9303 type with external linkage have external linkage. */
9307 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
9308 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
9310 bad_specifiers (decl, BSP_TYPE, virtualp,
9311 memfn_quals != TYPE_UNQUALIFIED,
9312 inlinep, friendp, raises != NULL_TREE);
9317 /* Detect the case of an array type of unspecified size
9318 which came, as such, direct from a typedef name.
9319 We must copy the type, so that the array's domain can be
9320 individually set by the object's initializer. */
9322 if (type && typedef_type
9323 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
9324 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
9325 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
9327 /* Detect where we're using a typedef of function type to declare a
9328 function. PARMS will not be set, so we must create it now. */
9330 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
9332 tree decls = NULL_TREE;
9335 for (args = TYPE_ARG_TYPES (type);
9336 args && args != void_list_node;
9337 args = TREE_CHAIN (args))
9339 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
9341 DECL_CHAIN (decl) = decls;
9345 parms = nreverse (decls);
9347 if (decl_context != TYPENAME)
9349 /* A cv-qualifier-seq shall only be part of the function type
9350 for a non-static member function. [8.3.5/4 dcl.fct] */
9351 if (type_memfn_quals (type) != TYPE_UNQUALIFIED
9352 && (current_class_type == NULL_TREE || staticp) )
9355 ? G_("qualified function types cannot be used to "
9356 "declare static member functions")
9357 : G_("qualified function types cannot be used to "
9358 "declare free functions"));
9359 type = TYPE_MAIN_VARIANT (type);
9362 /* The qualifiers on the function type become the qualifiers on
9363 the non-static member function. */
9364 memfn_quals |= type_memfn_quals (type);
9365 type_quals = TYPE_UNQUALIFIED;
9369 /* If this is a type name (such as, in a cast or sizeof),
9370 compute the type and return it now. */
9372 if (decl_context == TYPENAME)
9374 /* Note that the grammar rejects storage classes
9375 in typenames, fields or parameters. */
9376 if (type_quals != TYPE_UNQUALIFIED)
9377 type_quals = TYPE_UNQUALIFIED;
9379 /* Special case: "friend class foo" looks like a TYPENAME context. */
9382 if (type_quals != TYPE_UNQUALIFIED)
9384 error ("type qualifiers specified for friend class declaration");
9385 type_quals = TYPE_UNQUALIFIED;
9389 error ("%<inline%> specified for friend class declaration");
9395 /* Don't allow friend declaration without a class-key. */
9396 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
9397 permerror (input_location, "template parameters cannot be friends");
9398 else if (TREE_CODE (type) == TYPENAME_TYPE)
9399 permerror (input_location, "friend declaration requires class-key, "
9400 "i.e. %<friend class %T::%D%>",
9401 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
9403 permerror (input_location, "friend declaration requires class-key, "
9404 "i.e. %<friend %#T%>",
9408 /* Only try to do this stuff if we didn't already give up. */
9409 if (type != integer_type_node)
9411 /* A friendly class? */
9412 if (current_class_type)
9413 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
9416 error ("trying to make class %qT a friend of global scope",
9419 type = void_type_node;
9422 else if (memfn_quals)
9424 if (ctype == NULL_TREE
9425 && TREE_CODE (type) == METHOD_TYPE)
9426 ctype = TYPE_METHOD_BASETYPE (type);
9429 type = build_memfn_type (type, ctype, memfn_quals);
9430 /* Core issue #547: need to allow this in template type args. */
9431 else if (template_type_arg && TREE_CODE (type) == FUNCTION_TYPE)
9432 type = apply_memfn_quals (type, memfn_quals);
9434 error ("invalid qualifiers on non-member function type");
9439 else if (unqualified_id == NULL_TREE && decl_context != PARM
9440 && decl_context != CATCHPARM
9441 && TREE_CODE (type) != UNION_TYPE
9444 error ("abstract declarator %qT used as declaration", type);
9445 return error_mark_node;
9448 /* Only functions may be declared using an operator-function-id. */
9450 && IDENTIFIER_OPNAME_P (unqualified_id)
9451 && TREE_CODE (type) != FUNCTION_TYPE
9452 && TREE_CODE (type) != METHOD_TYPE)
9454 error ("declaration of %qD as non-function", unqualified_id);
9455 return error_mark_node;
9458 /* We don't check parameter types here because we can emit a better
9459 error message later. */
9460 if (decl_context != PARM)
9462 type = check_var_type (unqualified_id, type);
9463 if (type == error_mark_node)
9464 return error_mark_node;
9467 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
9468 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
9470 if (decl_context == PARM || decl_context == CATCHPARM)
9472 if (ctype || in_namespace)
9473 error ("cannot use %<::%> in parameter declaration");
9475 /* A parameter declared as an array of T is really a pointer to T.
9476 One declared as a function is really a pointer to a function.
9477 One declared as a member is really a pointer to member. */
9479 if (TREE_CODE (type) == ARRAY_TYPE)
9481 /* Transfer const-ness of array into that of type pointed to. */
9482 type = build_pointer_type (TREE_TYPE (type));
9483 type_quals = TYPE_UNQUALIFIED;
9485 else if (TREE_CODE (type) == FUNCTION_TYPE)
9486 type = build_pointer_type (type);
9489 if (ctype && TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
9490 && !NEW_DELETE_OPNAME_P (unqualified_id))
9491 type = build_memfn_type (type, ctype, memfn_quals);
9496 if (decl_context == PARM)
9498 decl = cp_build_parm_decl (unqualified_id, type);
9500 bad_specifiers (decl, BSP_PARM, virtualp,
9501 memfn_quals != TYPE_UNQUALIFIED,
9502 inlinep, friendp, raises != NULL_TREE);
9504 else if (decl_context == FIELD)
9506 /* The C99 flexible array extension. */
9507 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
9508 && TYPE_DOMAIN (type) == NULL_TREE)
9510 tree itype = compute_array_index_type (dname, integer_zero_node,
9511 tf_warning_or_error);
9512 type = build_cplus_array_type (TREE_TYPE (type), itype);
9515 if (type == error_mark_node)
9517 /* Happens when declaring arrays of sizes which
9518 are error_mark_node, for example. */
9521 else if (in_namespace && !friendp)
9523 /* Something like struct S { int N::j; }; */
9524 error ("invalid use of %<::%>");
9525 return error_mark_node;
9527 else if (TREE_CODE (type) == FUNCTION_TYPE
9528 || TREE_CODE (type) == METHOD_TYPE)
9531 tree function_context;
9535 /* This should never happen in pure C++ (the check
9536 could be an assert). It could happen in
9537 Objective-C++ if someone writes invalid code that
9538 uses a function declaration for an instance
9539 variable or property (instance variables and
9540 properties are parsed as FIELD_DECLs, but they are
9541 part of an Objective-C class, not a C++ class).
9542 That code is invalid and is caught by this
9546 error ("declaration of function %qD in invalid context",
9548 return error_mark_node;
9551 /* ``A union may [ ... ] not [ have ] virtual functions.''
9553 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
9555 error ("function %qD declared virtual inside a union",
9557 return error_mark_node;
9560 if (NEW_DELETE_OPNAME_P (unqualified_id))
9564 error ("%qD cannot be declared virtual, since it "
9572 /* Check that the name used for a destructor makes sense. */
9573 if (sfk == sfk_destructor)
9575 tree uqname = id_declarator->u.id.unqualified_name;
9579 gcc_assert (friendp);
9580 error ("expected qualified name in friend declaration "
9581 "for destructor %qD", uqname);
9582 return error_mark_node;
9585 if (!check_dtor_name (ctype, TREE_OPERAND (uqname, 0)))
9587 error ("declaration of %qD as member of %qT",
9589 return error_mark_node;
9593 error ("a destructor cannot be %<constexpr%>");
9594 return error_mark_node;
9597 else if (sfk == sfk_constructor && friendp && !ctype)
9599 error ("expected qualified name in friend declaration "
9600 "for constructor %qD",
9601 id_declarator->u.id.unqualified_name);
9602 return error_mark_node;
9605 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
9606 function_context = (ctype != NULL_TREE) ?
9607 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
9608 publicp = (! friendp || ! staticp)
9609 && function_context == NULL_TREE;
9610 decl = grokfndecl (ctype, type,
9611 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
9612 ? unqualified_id : dname,
9615 virtualp, flags, memfn_quals, raises,
9616 friendp ? -1 : 0, friendp, publicp,
9617 inlinep | (2 * constexpr_p),
9619 funcdef_flag, template_count, in_namespace,
9620 attrlist, declarator->id_loc);
9621 if (decl == NULL_TREE)
9622 return error_mark_node;
9624 /* This clobbers the attrs stored in `decl' from `attrlist'. */
9625 /* The decl and setting of decl_attr is also turned off. */
9626 decl = build_decl_attribute_variant (decl, decl_attr);
9629 /* [class.conv.ctor]
9631 A constructor declared without the function-specifier
9632 explicit that can be called with a single parameter
9633 specifies a conversion from the type of its first
9634 parameter to the type of its class. Such a constructor
9635 is called a converting constructor. */
9637 DECL_NONCONVERTING_P (decl) = 1;
9639 else if (!staticp && !dependent_type_p (type)
9640 && !COMPLETE_TYPE_P (complete_type (type))
9641 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
9644 error ("field %qD has incomplete type", unqualified_id);
9646 error ("name %qT has incomplete type", type);
9648 /* If we're instantiating a template, tell them which
9649 instantiation made the field's type be incomplete. */
9650 if (current_class_type
9651 && TYPE_NAME (current_class_type)
9652 && IDENTIFIER_TEMPLATE (TYPE_IDENTIFIER (current_class_type))
9654 && declspecs->type == type)
9655 error (" in instantiation of template %qT",
9656 current_class_type);
9658 return error_mark_node;
9664 error ("%qE is neither function nor member function; "
9665 "cannot be declared friend", unqualified_id);
9673 /* Friends are treated specially. */
9674 if (ctype == current_class_type)
9675 ; /* We already issued a permerror. */
9676 else if (decl && DECL_NAME (decl))
9678 if (template_class_depth (current_class_type) == 0)
9680 decl = check_explicit_specialization
9681 (unqualified_id, decl, template_count,
9682 2 * funcdef_flag + 4);
9683 if (decl == error_mark_node)
9684 return error_mark_node;
9687 DECL_DECLARED_CONSTEXPR_P (decl) = constexpr_p;
9688 decl = do_friend (ctype, unqualified_id, decl,
9694 return error_mark_node;
9697 /* Structure field. It may not be a function, except for C++. */
9699 if (decl == NULL_TREE)
9705 /* An attempt is being made to initialize a non-static
9706 member. But, from [class.mem]:
9708 4 A member-declarator can contain a
9709 constant-initializer only if it declares a static
9710 member (_class.static_) of integral or enumeration
9711 type, see _class.static.data_.
9713 This used to be relatively common practice, but
9714 the rest of the compiler does not correctly
9715 handle the initialization unless the member is
9716 static so we make it static below. */
9717 if (cxx_dialect >= cxx0x)
9719 sorry ("non-static data member initializers");
9723 permerror (input_location, "ISO C++ forbids initialization of member %qD",
9725 permerror (input_location, "making %qD static", unqualified_id);
9730 if (uses_template_parms (type))
9731 /* We'll check at instantiation time. */
9733 else if (constexpr_p)
9734 /* constexpr has the same requirements. */
9736 else if (check_static_variable_definition (unqualified_id,
9738 /* If we just return the declaration, crashes
9739 will sometimes occur. We therefore return
9740 void_type_node, as if this was a friend
9741 declaration, to cause callers to completely
9742 ignore this declaration. */
9743 return error_mark_node;
9748 /* C++ allows static class members. All other work
9749 for this is done by grokfield. */
9750 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
9751 set_linkage_for_static_data_member (decl);
9752 /* Even if there is an in-class initialization, DECL
9753 is considered undefined until an out-of-class
9754 definition is provided. */
9755 DECL_EXTERNAL (decl) = 1;
9758 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
9764 error ("non-static data member %qE declared %<constexpr%>",
9766 constexpr_p = false;
9768 decl = build_decl (input_location,
9769 FIELD_DECL, unqualified_id, type);
9770 DECL_NONADDRESSABLE_P (decl) = bitfield;
9771 if (bitfield && !unqualified_id)
9772 TREE_NO_WARNING (decl) = 1;
9774 if (storage_class == sc_mutable)
9776 DECL_MUTABLE_P (decl) = 1;
9777 storage_class = sc_none;
9781 bad_specifiers (decl, BSP_FIELD, virtualp,
9782 memfn_quals != TYPE_UNQUALIFIED,
9783 inlinep, friendp, raises != NULL_TREE);
9786 else if (TREE_CODE (type) == FUNCTION_TYPE
9787 || TREE_CODE (type) == METHOD_TYPE)
9792 if (!unqualified_id)
9793 return error_mark_node;
9795 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
9796 original_name = dname;
9798 original_name = unqualified_id;
9800 if (storage_class == sc_auto)
9801 error ("storage class %<auto%> invalid for function %qs", name);
9802 else if (storage_class == sc_register)
9803 error ("storage class %<register%> invalid for function %qs", name);
9805 error ("storage class %<__thread%> invalid for function %qs", name);
9807 /* Function declaration not at top level.
9808 Storage classes other than `extern' are not allowed
9809 and `extern' makes no difference. */
9810 if (! toplevel_bindings_p ()
9811 && (storage_class == sc_static
9812 || declspecs->specs[(int)ds_inline])
9815 if (storage_class == sc_static)
9816 pedwarn (input_location, OPT_pedantic,
9817 "%<static%> specified invalid for function %qs "
9818 "declared out of global scope", name);
9820 pedwarn (input_location, OPT_pedantic,
9821 "%<inline%> specifier invalid for function %qs "
9822 "declared out of global scope", name);
9825 if (ctype != NULL_TREE
9826 && TREE_CODE (ctype) != NAMESPACE_DECL && !MAYBE_CLASS_TYPE_P (ctype))
9828 error ("%q#T is not a class or a namespace", ctype);
9832 if (ctype == NULL_TREE)
9836 error ("virtual non-class function %qs", name);
9839 else if (sfk == sfk_constructor
9840 || sfk == sfk_destructor)
9843 ? "%qs defined in a non-class scope"
9844 : "%qs declared in a non-class scope", name);
9849 /* Record presence of `static'. */
9850 publicp = (ctype != NULL_TREE
9851 || storage_class == sc_extern
9852 || storage_class != sc_static);
9854 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
9855 virtualp, flags, memfn_quals, raises,
9857 publicp, inlinep | (2 * constexpr_p), sfk,
9859 template_count, in_namespace, attrlist,
9860 declarator->id_loc);
9861 if (decl == NULL_TREE)
9862 return error_mark_node;
9866 int invalid_static = 0;
9868 /* Don't allow a static member function in a class, and forbid
9869 declaring main to be static. */
9870 if (TREE_CODE (type) == METHOD_TYPE)
9872 permerror (input_location, "cannot declare member function %qD to have "
9873 "static linkage", decl);
9876 else if (current_function_decl)
9878 /* FIXME need arm citation */
9879 error ("cannot declare static function inside another function");
9886 storage_class = sc_none;
9892 /* It's a variable. */
9894 /* An uninitialized decl with `extern' is a reference. */
9895 decl = grokvardecl (type, unqualified_id,
9898 (type_quals & TYPE_QUAL_CONST) != 0,
9899 ctype ? ctype : in_namespace);
9900 bad_specifiers (decl, BSP_VAR, virtualp,
9901 memfn_quals != TYPE_UNQUALIFIED,
9902 inlinep, friendp, raises != NULL_TREE);
9906 DECL_CONTEXT (decl) = ctype;
9909 permerror (input_location, "%<static%> may not be used when defining "
9910 "(as opposed to declaring) a static data member");
9912 storage_class = sc_none;
9914 if (storage_class == sc_register && TREE_STATIC (decl))
9916 error ("static member %qD declared %<register%>", decl);
9917 storage_class = sc_none;
9919 if (storage_class == sc_extern && pedantic)
9921 pedwarn (input_location, OPT_pedantic,
9922 "cannot explicitly declare member %q#D to have "
9923 "extern linkage", decl);
9924 storage_class = sc_none;
9927 else if (constexpr_p && DECL_EXTERNAL (decl))
9928 error ("declaration of constexpr variable %qD is not a definition",
9932 if (storage_class == sc_extern && initialized && !funcdef_flag)
9934 if (toplevel_bindings_p ())
9936 /* It's common practice (and completely valid) to have a const
9937 be initialized and declared extern. */
9938 if (!(type_quals & TYPE_QUAL_CONST))
9939 warning (0, "%qs initialized and declared %<extern%>", name);
9943 error ("%qs has both %<extern%> and initializer", name);
9944 return error_mark_node;
9948 /* Record `register' declaration for warnings on &
9949 and in case doing stupid register allocation. */
9951 if (storage_class == sc_register)
9952 DECL_REGISTER (decl) = 1;
9953 else if (storage_class == sc_extern)
9954 DECL_THIS_EXTERN (decl) = 1;
9955 else if (storage_class == sc_static)
9956 DECL_THIS_STATIC (decl) = 1;
9958 /* Don't forget constexprness. */
9960 DECL_DECLARED_CONSTEXPR_P (decl) = true;
9962 /* Record constancy and volatility on the DECL itself . There's
9963 no need to do this when processing a template; we'll do this
9964 for the instantiated declaration based on the type of DECL. */
9965 if (!processing_template_decl)
9966 cp_apply_type_quals_to_decl (type_quals, decl);
9972 /* Subroutine of start_function. Ensure that each of the parameter
9973 types (as listed in PARMS) is complete, as is required for a
9974 function definition. */
9977 require_complete_types_for_parms (tree parms)
9979 for (; parms; parms = DECL_CHAIN (parms))
9981 if (dependent_type_p (TREE_TYPE (parms)))
9983 if (!VOID_TYPE_P (TREE_TYPE (parms))
9984 && complete_type_or_else (TREE_TYPE (parms), parms))
9986 relayout_decl (parms);
9987 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
9990 /* grokparms or complete_type_or_else will have already issued
9992 TREE_TYPE (parms) = error_mark_node;
9996 /* Returns nonzero if T is a local variable. */
9999 local_variable_p (const_tree t)
10001 if ((TREE_CODE (t) == VAR_DECL
10002 /* A VAR_DECL with a context that is a _TYPE is a static data
10004 && !TYPE_P (CP_DECL_CONTEXT (t))
10005 /* Any other non-local variable must be at namespace scope. */
10006 && !DECL_NAMESPACE_SCOPE_P (t))
10007 || (TREE_CODE (t) == PARM_DECL))
10013 /* Like local_variable_p, but suitable for use as a tree-walking
10017 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
10018 void *data ATTRIBUTE_UNUSED)
10020 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
10022 else if (TYPE_P (*tp))
10023 *walk_subtrees = 0;
10029 /* Check that ARG, which is a default-argument expression for a
10030 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
10031 something goes wrong. DECL may also be a _TYPE node, rather than a
10032 DECL, if there is no DECL available. */
10035 check_default_argument (tree decl, tree arg)
10040 if (TREE_CODE (arg) == DEFAULT_ARG)
10041 /* We get a DEFAULT_ARG when looking at an in-class declaration
10042 with a default argument. Ignore the argument for now; we'll
10043 deal with it after the class is complete. */
10052 decl_type = TREE_TYPE (decl);
10054 if (arg == error_mark_node
10055 || decl == error_mark_node
10056 || TREE_TYPE (arg) == error_mark_node
10057 || decl_type == error_mark_node)
10058 /* Something already went wrong. There's no need to check
10060 return error_mark_node;
10062 /* [dcl.fct.default]
10064 A default argument expression is implicitly converted to the
10066 if (!TREE_TYPE (arg)
10067 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
10070 error ("default argument for %q#D has type %qT",
10071 decl, TREE_TYPE (arg));
10073 error ("default argument for parameter of type %qT has type %qT",
10074 decl_type, TREE_TYPE (arg));
10076 return error_mark_node;
10079 /* [dcl.fct.default]
10081 Local variables shall not be used in default argument
10084 The keyword `this' shall not be used in a default argument of a
10085 member function. */
10086 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
10089 error ("default argument %qE uses local variable %qD", arg, var);
10090 return error_mark_node;
10097 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
10100 type_is_deprecated (tree type)
10102 enum tree_code code;
10103 if (TREE_DEPRECATED (type))
10105 if (TYPE_NAME (type)
10106 && TREE_DEPRECATED (TYPE_NAME (type)))
10109 /* Do warn about using typedefs to a deprecated class. */
10110 if (TAGGED_TYPE_P (type) && type != TYPE_MAIN_VARIANT (type))
10111 return type_is_deprecated (TYPE_MAIN_VARIANT (type));
10113 code = TREE_CODE (type);
10115 if (code == POINTER_TYPE || code == REFERENCE_TYPE
10116 || code == OFFSET_TYPE || code == FUNCTION_TYPE
10117 || code == METHOD_TYPE || code == ARRAY_TYPE)
10118 return type_is_deprecated (TREE_TYPE (type));
10120 if (TYPE_PTRMEMFUNC_P (type))
10121 return type_is_deprecated
10122 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type))));
10127 /* Decode the list of parameter types for a function type.
10128 Given the list of things declared inside the parens,
10129 return a list of types.
10131 If this parameter does not end with an ellipsis, we append
10134 *PARMS is set to the chain of PARM_DECLs created. */
10137 grokparms (tree parmlist, tree *parms)
10139 tree result = NULL_TREE;
10140 tree decls = NULL_TREE;
10144 for (parm = parmlist; parm != NULL_TREE; parm = TREE_CHAIN (parm))
10146 tree type = NULL_TREE;
10147 tree init = TREE_PURPOSE (parm);
10148 tree decl = TREE_VALUE (parm);
10149 const char *errmsg;
10151 if (parm == void_list_node)
10154 if (! decl || TREE_TYPE (decl) == error_mark_node)
10157 type = TREE_TYPE (decl);
10158 if (VOID_TYPE_P (type))
10160 if (same_type_p (type, void_type_node)
10161 && DECL_SELF_REFERENCE_P (type)
10162 && !DECL_NAME (decl) && !result && TREE_CHAIN (parm) == void_list_node)
10163 /* this is a parmlist of `(void)', which is ok. */
10165 cxx_incomplete_type_error (decl, type);
10166 /* It's not a good idea to actually create parameters of
10167 type `void'; other parts of the compiler assume that a
10168 void type terminates the parameter list. */
10169 type = error_mark_node;
10170 TREE_TYPE (decl) = error_mark_node;
10173 if (type != error_mark_node
10174 && TYPE_FOR_JAVA (type)
10175 && MAYBE_CLASS_TYPE_P (type))
10177 error ("parameter %qD has Java class type", decl);
10178 type = error_mark_node;
10179 TREE_TYPE (decl) = error_mark_node;
10183 if (type != error_mark_node
10184 && (errmsg = targetm.invalid_parameter_type (type)))
10187 type = error_mark_node;
10188 TREE_TYPE (decl) = error_mark_node;
10191 if (type != error_mark_node)
10193 if (deprecated_state != DEPRECATED_SUPPRESS)
10195 tree deptype = type_is_deprecated (type);
10197 warn_deprecated_use (deptype, NULL_TREE);
10200 /* Top-level qualifiers on the parameters are
10201 ignored for function types. */
10202 type = cp_build_qualified_type (type, 0);
10203 if (TREE_CODE (type) == METHOD_TYPE)
10205 error ("parameter %qD invalidly declared method type", decl);
10206 type = build_pointer_type (type);
10207 TREE_TYPE (decl) = type;
10209 else if (abstract_virtuals_error (decl, type))
10210 any_error = 1; /* Seems like a good idea. */
10211 else if (POINTER_TYPE_P (type))
10213 /* [dcl.fct]/6, parameter types cannot contain pointers
10214 (references) to arrays of unknown bound. */
10215 tree t = TREE_TYPE (type);
10216 int ptr = TYPE_PTR_P (type);
10220 if (TYPE_PTR_P (t))
10222 else if (TREE_CODE (t) != ARRAY_TYPE)
10224 else if (!TYPE_DOMAIN (t))
10228 if (TREE_CODE (t) == ARRAY_TYPE)
10230 ? G_("parameter %qD includes pointer to array of "
10231 "unknown bound %qT")
10232 : G_("parameter %qD includes reference to array of "
10233 "unknown bound %qT"),
10239 else if (init && !processing_template_decl)
10240 init = check_default_argument (decl, init);
10243 if (TREE_CODE (decl) == PARM_DECL
10244 && FUNCTION_PARAMETER_PACK_P (decl)
10245 && TREE_CHAIN (parm)
10246 && TREE_CHAIN (parm) != void_list_node)
10247 error ("parameter packs must be at the end of the parameter list");
10249 DECL_CHAIN (decl) = decls;
10251 result = tree_cons (init, type, result);
10253 decls = nreverse (decls);
10254 result = nreverse (result);
10256 result = chainon (result, void_list_node);
10263 /* D is a constructor or overloaded `operator='.
10265 Let T be the class in which D is declared. Then, this function
10268 -1 if D's is an ill-formed constructor or copy assignment operator
10269 whose first parameter is of type `T'.
10270 0 if D is not a copy constructor or copy assignment
10272 1 if D is a copy constructor or copy assignment operator whose
10273 first parameter is a reference to non-const qualified T.
10274 2 if D is a copy constructor or copy assignment operator whose
10275 first parameter is a reference to const qualified T.
10277 This function can be used as a predicate. Positive values indicate
10278 a copy constructor and nonzero values indicate a copy assignment
10282 copy_fn_p (const_tree d)
10288 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10290 if (TREE_CODE (d) == TEMPLATE_DECL
10291 || (DECL_TEMPLATE_INFO (d)
10292 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10293 /* Instantiations of template member functions are never copy
10294 functions. Note that member functions of templated classes are
10295 represented as template functions internally, and we must
10296 accept those as copy functions. */
10299 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10303 arg_type = TREE_VALUE (args);
10304 if (arg_type == error_mark_node)
10307 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
10309 /* Pass by value copy assignment operator. */
10312 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
10313 && !TYPE_REF_IS_RVALUE (arg_type)
10314 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
10316 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
10322 args = TREE_CHAIN (args);
10324 if (args && args != void_list_node && !TREE_PURPOSE (args))
10325 /* There are more non-optional args. */
10331 /* D is a constructor or overloaded `operator='.
10333 Let T be the class in which D is declared. Then, this function
10334 returns true when D is a move constructor or move assignment
10335 operator, false otherwise. */
10338 move_fn_p (const_tree d)
10342 bool result = false;
10344 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10346 if (cxx_dialect == cxx98)
10347 /* There are no move constructors if we are in C++98 mode. */
10350 if (TREE_CODE (d) == TEMPLATE_DECL
10351 || (DECL_TEMPLATE_INFO (d)
10352 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10353 /* Instantiations of template member functions are never copy
10354 functions. Note that member functions of templated classes are
10355 represented as template functions internally, and we must
10356 accept those as copy functions. */
10359 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10363 arg_type = TREE_VALUE (args);
10364 if (arg_type == error_mark_node)
10367 if (TREE_CODE (arg_type) == REFERENCE_TYPE
10368 && TYPE_REF_IS_RVALUE (arg_type)
10369 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
10373 args = TREE_CHAIN (args);
10375 if (args && args != void_list_node && !TREE_PURPOSE (args))
10376 /* There are more non-optional args. */
10382 /* Remember any special properties of member function DECL. */
10385 grok_special_member_properties (tree decl)
10389 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
10392 class_type = DECL_CONTEXT (decl);
10393 if (DECL_CONSTRUCTOR_P (decl))
10395 int ctor = copy_fn_p (decl);
10397 if (!DECL_ARTIFICIAL (decl))
10398 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
10404 A non-template constructor for class X is a copy
10405 constructor if its first parameter is of type X&, const
10406 X&, volatile X& or const volatile X&, and either there
10407 are no other parameters or else all other parameters have
10408 default arguments. */
10409 TYPE_HAS_COPY_CTOR (class_type) = 1;
10410 if (user_provided_p (decl))
10411 TYPE_HAS_COMPLEX_COPY_CTOR (class_type) = 1;
10413 TYPE_HAS_CONST_COPY_CTOR (class_type) = 1;
10415 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
10417 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
10418 if (user_provided_p (decl))
10419 TYPE_HAS_COMPLEX_DFLT (class_type) = 1;
10421 else if (move_fn_p (decl) && user_provided_p (decl))
10422 TYPE_HAS_COMPLEX_MOVE_CTOR (class_type) = 1;
10423 else if (is_list_ctor (decl))
10424 TYPE_HAS_LIST_CTOR (class_type) = 1;
10426 if (DECL_DECLARED_CONSTEXPR_P (decl)
10427 && !copy_fn_p (decl) && !move_fn_p (decl))
10428 TYPE_HAS_CONSTEXPR_CTOR (class_type) = 1;
10430 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
10434 A non-template assignment operator for class X is a copy
10435 assignment operator if its parameter is of type X, X&, const
10436 X&, volatile X& or const volatile X&. */
10438 int assop = copy_fn_p (decl);
10442 TYPE_HAS_COPY_ASSIGN (class_type) = 1;
10443 if (user_provided_p (decl))
10444 TYPE_HAS_COMPLEX_COPY_ASSIGN (class_type) = 1;
10446 TYPE_HAS_CONST_COPY_ASSIGN (class_type) = 1;
10448 else if (move_fn_p (decl) && user_provided_p (decl))
10449 TYPE_HAS_COMPLEX_MOVE_ASSIGN (class_type) = 1;
10451 /* Destructors are handled in check_methods. */
10454 /* Check a constructor DECL has the correct form. Complains
10455 if the class has a constructor of the form X(X). */
10458 grok_ctor_properties (const_tree ctype, const_tree decl)
10460 int ctor_parm = copy_fn_p (decl);
10466 A declaration of a constructor for a class X is ill-formed if
10467 its first parameter is of type (optionally cv-qualified) X
10468 and either there are no other parameters or else all other
10469 parameters have default arguments.
10471 We *don't* complain about member template instantiations that
10472 have this form, though; they can occur as we try to decide
10473 what constructor to use during overload resolution. Since
10474 overload resolution will never prefer such a constructor to
10475 the non-template copy constructor (which is either explicitly
10476 or implicitly defined), there's no need to worry about their
10477 existence. Theoretically, they should never even be
10478 instantiated, but that's hard to forestall. */
10479 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
10487 /* An operator with this code is unary, but can also be binary. */
10490 ambi_op_p (enum tree_code code)
10492 return (code == INDIRECT_REF
10493 || code == ADDR_EXPR
10494 || code == UNARY_PLUS_EXPR
10495 || code == NEGATE_EXPR
10496 || code == PREINCREMENT_EXPR
10497 || code == PREDECREMENT_EXPR);
10500 /* An operator with this name can only be unary. */
10503 unary_op_p (enum tree_code code)
10505 return (code == TRUTH_NOT_EXPR
10506 || code == BIT_NOT_EXPR
10507 || code == COMPONENT_REF
10508 || code == TYPE_EXPR);
10511 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
10512 errors are issued for invalid declarations. */
10515 grok_op_properties (tree decl, bool complain)
10517 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
10519 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
10520 tree name = DECL_NAME (decl);
10521 enum tree_code operator_code;
10526 /* Count the number of arguments and check for ellipsis. */
10527 for (argtype = argtypes, arity = 0;
10528 argtype && argtype != void_list_node;
10529 argtype = TREE_CHAIN (argtype))
10531 ellipsis_p = !argtype;
10533 class_type = DECL_CONTEXT (decl);
10534 if (class_type && !CLASS_TYPE_P (class_type))
10535 class_type = NULL_TREE;
10537 if (DECL_CONV_FN_P (decl))
10538 operator_code = TYPE_EXPR;
10542 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
10543 if (ansi_opname (CODE) == name) \
10545 operator_code = (CODE); \
10548 else if (ansi_assopname (CODE) == name) \
10550 operator_code = (CODE); \
10551 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
10555 #include "operators.def"
10556 #undef DEF_OPERATOR
10558 gcc_unreachable ();
10561 gcc_assert (operator_code != MAX_TREE_CODES);
10562 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10565 switch (operator_code)
10568 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
10572 TYPE_GETS_DELETE (class_type) |= 1;
10576 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
10579 case VEC_DELETE_EXPR:
10580 TYPE_GETS_DELETE (class_type) |= 2;
10587 /* [basic.std.dynamic.allocation]/1:
10589 A program is ill-formed if an allocation function is declared
10590 in a namespace scope other than global scope or declared static
10593 The same also holds true for deallocation functions. */
10594 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
10595 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10597 if (DECL_NAMESPACE_SCOPE_P (decl))
10599 if (CP_DECL_CONTEXT (decl) != global_namespace)
10601 error ("%qD may not be declared within a namespace", decl);
10604 else if (!TREE_PUBLIC (decl))
10606 error ("%qD may not be declared as static", decl);
10612 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
10614 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
10615 DECL_IS_OPERATOR_NEW (decl) = 1;
10617 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10618 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
10621 /* An operator function must either be a non-static member function
10622 or have at least one parameter of a class, a reference to a class,
10623 an enumeration, or a reference to an enumeration. 13.4.0.6 */
10624 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
10626 if (operator_code == TYPE_EXPR
10627 || operator_code == CALL_EXPR
10628 || operator_code == COMPONENT_REF
10629 || operator_code == ARRAY_REF
10630 || operator_code == NOP_EXPR)
10632 error ("%qD must be a nonstatic member function", decl);
10639 if (DECL_STATIC_FUNCTION_P (decl))
10641 error ("%qD must be either a non-static member "
10642 "function or a non-member function", decl);
10646 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
10648 tree arg = non_reference (TREE_VALUE (p));
10649 if (arg == error_mark_node)
10652 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
10653 because these checks are performed even on
10654 template functions. */
10655 if (MAYBE_CLASS_TYPE_P (arg)
10656 || TREE_CODE (arg) == ENUMERAL_TYPE)
10660 if (!p || p == void_list_node)
10663 error ("%qD must have an argument of class or "
10664 "enumerated type", decl);
10670 /* There are no restrictions on the arguments to an overloaded
10672 if (operator_code == CALL_EXPR)
10675 /* Warn about conversion operators that will never be used. */
10676 if (IDENTIFIER_TYPENAME_P (name)
10677 && ! DECL_TEMPLATE_INFO (decl)
10679 /* Warn only declaring the function; there is no need to
10680 warn again about out-of-class definitions. */
10681 && class_type == current_class_type)
10683 tree t = TREE_TYPE (name);
10684 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
10687 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
10689 if (TREE_CODE (t) == VOID_TYPE)
10690 warning (OPT_Wconversion,
10692 ? G_("conversion to a reference to void "
10693 "will never use a type conversion operator")
10694 : G_("conversion to void "
10695 "will never use a type conversion operator"));
10696 else if (class_type)
10698 if (t == class_type)
10699 warning (OPT_Wconversion,
10701 ? G_("conversion to a reference to the same type "
10702 "will never use a type conversion operator")
10703 : G_("conversion to the same type "
10704 "will never use a type conversion operator"));
10705 /* Don't force t to be complete here. */
10706 else if (MAYBE_CLASS_TYPE_P (t)
10707 && COMPLETE_TYPE_P (t)
10708 && DERIVED_FROM_P (t, class_type))
10709 warning (OPT_Wconversion,
10711 ? G_("conversion to a reference to a base class "
10712 "will never use a type conversion operator")
10713 : G_("conversion to a base class "
10714 "will never use a type conversion operator"));
10719 if (operator_code == COND_EXPR)
10722 error ("ISO C++ prohibits overloading operator ?:");
10725 else if (ellipsis_p)
10727 error ("%qD must not have variable number of arguments", decl);
10730 else if (ambi_op_p (operator_code))
10733 /* We pick the one-argument operator codes by default, so
10734 we don't have to change anything. */
10736 else if (arity == 2)
10738 /* If we thought this was a unary operator, we now know
10739 it to be a binary operator. */
10740 switch (operator_code)
10743 operator_code = MULT_EXPR;
10747 operator_code = BIT_AND_EXPR;
10750 case UNARY_PLUS_EXPR:
10751 operator_code = PLUS_EXPR;
10755 operator_code = MINUS_EXPR;
10758 case PREINCREMENT_EXPR:
10759 operator_code = POSTINCREMENT_EXPR;
10762 case PREDECREMENT_EXPR:
10763 operator_code = POSTDECREMENT_EXPR;
10767 gcc_unreachable ();
10770 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10772 if ((operator_code == POSTINCREMENT_EXPR
10773 || operator_code == POSTDECREMENT_EXPR)
10774 && ! processing_template_decl
10775 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
10778 error ("postfix %qD must take %<int%> as its argument",
10781 error ("postfix %qD must take %<int%> as its second "
10789 error ("%qD must take either zero or one argument", decl);
10791 error ("%qD must take either one or two arguments", decl);
10795 /* More Effective C++ rule 6. */
10797 && (operator_code == POSTINCREMENT_EXPR
10798 || operator_code == POSTDECREMENT_EXPR
10799 || operator_code == PREINCREMENT_EXPR
10800 || operator_code == PREDECREMENT_EXPR))
10802 tree arg = TREE_VALUE (argtypes);
10803 tree ret = TREE_TYPE (TREE_TYPE (decl));
10804 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
10805 arg = TREE_TYPE (arg);
10806 arg = TYPE_MAIN_VARIANT (arg);
10807 if (operator_code == PREINCREMENT_EXPR
10808 || operator_code == PREDECREMENT_EXPR)
10810 if (TREE_CODE (ret) != REFERENCE_TYPE
10811 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
10813 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
10814 build_reference_type (arg));
10818 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
10819 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
10823 else if (unary_op_p (operator_code))
10828 error ("%qD must take %<void%>", decl);
10830 error ("%qD must take exactly one argument", decl);
10834 else /* if (binary_op_p (operator_code)) */
10839 error ("%qD must take exactly one argument", decl);
10841 error ("%qD must take exactly two arguments", decl);
10845 /* More Effective C++ rule 7. */
10847 && (operator_code == TRUTH_ANDIF_EXPR
10848 || operator_code == TRUTH_ORIF_EXPR
10849 || operator_code == COMPOUND_EXPR))
10850 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
10854 /* Effective C++ rule 23. */
10857 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
10858 && (operator_code == PLUS_EXPR
10859 || operator_code == MINUS_EXPR
10860 || operator_code == TRUNC_DIV_EXPR
10861 || operator_code == MULT_EXPR
10862 || operator_code == TRUNC_MOD_EXPR)
10863 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
10864 warning (OPT_Weffc__, "%qD should return by value", decl);
10866 /* [over.oper]/8 */
10867 for (; argtypes && argtypes != void_list_node;
10868 argtypes = TREE_CHAIN (argtypes))
10869 if (TREE_PURPOSE (argtypes))
10871 TREE_PURPOSE (argtypes) = NULL_TREE;
10872 if (operator_code == POSTINCREMENT_EXPR
10873 || operator_code == POSTDECREMENT_EXPR)
10875 pedwarn (input_location, OPT_pedantic, "%qD cannot have default arguments",
10880 error ("%qD cannot have default arguments", decl);
10888 /* Return a string giving the keyword associate with CODE. */
10890 static const char *
10891 tag_name (enum tag_types code)
10903 case typename_type:
10906 gcc_unreachable ();
10910 /* Name lookup in an elaborated-type-specifier (after the keyword
10911 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
10912 elaborated-type-specifier is invalid, issue a diagnostic and return
10913 error_mark_node; otherwise, return the *_TYPE to which it referred.
10914 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
10917 check_elaborated_type_specifier (enum tag_types tag_code,
10919 bool allow_template_p)
10925 struct S { struct S *p; };
10927 name lookup will find the TYPE_DECL for the implicit "S::S"
10928 typedef. Adjust for that here. */
10929 if (DECL_SELF_REFERENCE_P (decl))
10930 decl = TYPE_NAME (TREE_TYPE (decl));
10932 type = TREE_TYPE (decl);
10934 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
10935 is false for this case as well. */
10936 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
10938 error ("using template type parameter %qT after %qs",
10939 type, tag_name (tag_code));
10940 return error_mark_node;
10944 If the identifier resolves to a typedef-name or a template
10945 type-parameter, the elaborated-type-specifier is ill-formed.
10947 In other words, the only legitimate declaration to use in the
10948 elaborated type specifier is the implicit typedef created when
10949 the type is declared. */
10950 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
10951 && !DECL_SELF_REFERENCE_P (decl)
10952 && tag_code != typename_type)
10954 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
10955 error ("%q+D has a previous declaration here", decl);
10956 return error_mark_node;
10958 else if (TREE_CODE (type) != RECORD_TYPE
10959 && TREE_CODE (type) != UNION_TYPE
10960 && tag_code != enum_type
10961 && tag_code != typename_type)
10963 error ("%qT referred to as %qs", type, tag_name (tag_code));
10964 error ("%q+T has a previous declaration here", type);
10965 return error_mark_node;
10967 else if (TREE_CODE (type) != ENUMERAL_TYPE
10968 && tag_code == enum_type)
10970 error ("%qT referred to as enum", type);
10971 error ("%q+T has a previous declaration here", type);
10972 return error_mark_node;
10974 else if (!allow_template_p
10975 && TREE_CODE (type) == RECORD_TYPE
10976 && CLASSTYPE_IS_TEMPLATE (type))
10978 /* If a class template appears as elaborated type specifier
10979 without a template header such as:
10981 template <class T> class C {};
10982 void f(class C); // No template header here
10984 then the required template argument is missing. */
10985 error ("template argument required for %<%s %T%>",
10986 tag_name (tag_code),
10987 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
10988 return error_mark_node;
10994 /* Lookup NAME in elaborate type specifier in scope according to
10995 SCOPE and issue diagnostics if necessary.
10996 Return *_TYPE node upon success, NULL_TREE when the NAME is not
10997 found, and ERROR_MARK_NODE for type error. */
11000 lookup_and_check_tag (enum tag_types tag_code, tree name,
11001 tag_scope scope, bool template_header_p)
11005 if (scope == ts_global)
11007 /* First try ordinary name lookup, ignoring hidden class name
11008 injected via friend declaration. */
11009 decl = lookup_name_prefer_type (name, 2);
11010 /* If that fails, the name will be placed in the smallest
11011 non-class, non-function-prototype scope according to 3.3.1/5.
11012 We may already have a hidden name declared as friend in this
11013 scope. So lookup again but not ignoring hidden names.
11014 If we find one, that name will be made visible rather than
11015 creating a new tag. */
11017 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
11020 decl = lookup_type_scope (name, scope);
11022 if (decl && DECL_CLASS_TEMPLATE_P (decl))
11023 decl = DECL_TEMPLATE_RESULT (decl);
11025 if (decl && TREE_CODE (decl) == TYPE_DECL)
11027 /* Look for invalid nested type:
11031 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
11033 error ("%qD has the same name as the class in which it is "
11036 return error_mark_node;
11039 /* Two cases we need to consider when deciding if a class
11040 template is allowed as an elaborated type specifier:
11041 1. It is a self reference to its own class.
11042 2. It comes with a template header.
11046 template <class T> class C {
11047 class C *c1; // DECL_SELF_REFERENCE_P is true
11050 template <class U> class C; // template_header_p is true
11051 template <class T> class C<T>::D {
11052 class C *c2; // DECL_SELF_REFERENCE_P is true
11055 t = check_elaborated_type_specifier (tag_code,
11058 | DECL_SELF_REFERENCE_P (decl));
11061 else if (decl && TREE_CODE (decl) == TREE_LIST)
11063 error ("reference to %qD is ambiguous", name);
11064 print_candidates (decl);
11065 return error_mark_node;
11071 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
11072 Define the tag as a forward-reference if it is not defined.
11074 If a declaration is given, process it here, and report an error if
11075 multiple declarations are not identical.
11077 SCOPE is TS_CURRENT when this is also a definition. Only look in
11078 the current frame for the name (since C++ allows new names in any
11079 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
11080 declaration. Only look beginning from the current scope outward up
11081 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
11083 TEMPLATE_HEADER_P is true when this declaration is preceded by
11084 a set of template parameters. */
11087 xref_tag (enum tag_types tag_code, tree name,
11088 tag_scope scope, bool template_header_p)
11090 enum tree_code code;
11092 tree context = NULL_TREE;
11094 timevar_push (TV_NAME_LOOKUP);
11096 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11102 code = RECORD_TYPE;
11108 code = ENUMERAL_TYPE;
11111 gcc_unreachable ();
11114 /* In case of anonymous name, xref_tag is only called to
11115 make type node and push name. Name lookup is not required. */
11116 if (ANON_AGGRNAME_P (name))
11119 t = lookup_and_check_tag (tag_code, name,
11120 scope, template_header_p);
11122 if (t == error_mark_node)
11123 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
11125 if (scope != ts_current && t && current_class_type
11126 && template_class_depth (current_class_type)
11127 && template_header_p)
11129 /* Since SCOPE is not TS_CURRENT, we are not looking at a
11130 definition of this tag. Since, in addition, we are currently
11131 processing a (member) template declaration of a template
11132 class, we must be very careful; consider:
11139 { template <class V>
11140 friend struct S1; };
11142 Here, the S2::S1 declaration should not be confused with the
11143 outer declaration. In particular, the inner version should
11144 have a template parameter of level 2, not level 1. This
11145 would be particularly important if the member declaration
11148 template <class V = U> friend struct S1;
11150 say, when we should tsubst into `U' when instantiating
11151 S2. On the other hand, when presented with:
11161 we must find the inner binding eventually. We
11162 accomplish this by making sure that the new type we
11163 create to represent this declaration has the right
11165 context = TYPE_CONTEXT (t);
11171 /* If no such tag is yet defined, create a forward-reference node
11172 and record it as the "definition".
11173 When a real declaration of this type is found,
11174 the forward-reference will be altered into a real type. */
11175 if (code == ENUMERAL_TYPE)
11177 error ("use of enum %q#D without previous declaration", name);
11178 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
11182 t = make_class_type (code);
11183 TYPE_CONTEXT (t) = context;
11184 t = pushtag (name, t, scope);
11189 if (template_header_p && MAYBE_CLASS_TYPE_P (t))
11191 if (!redeclare_class_template (t, current_template_parms))
11192 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
11194 else if (!processing_template_decl
11195 && CLASS_TYPE_P (t)
11196 && CLASSTYPE_IS_TEMPLATE (t))
11198 error ("redeclaration of %qT as a non-template", t);
11199 error ("previous declaration %q+D", t);
11200 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
11203 /* Make injected friend class visible. */
11204 if (scope != ts_within_enclosing_non_class
11205 && hidden_name_p (TYPE_NAME (t)))
11207 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
11208 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
11210 if (TYPE_TEMPLATE_INFO (t))
11212 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
11213 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
11218 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t);
11222 xref_tag_from_type (tree old, tree id, tag_scope scope)
11224 enum tag_types tag_kind;
11226 if (TREE_CODE (old) == RECORD_TYPE)
11227 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
11229 tag_kind = union_type;
11231 if (id == NULL_TREE)
11232 id = TYPE_IDENTIFIER (old);
11234 return xref_tag (tag_kind, id, scope, false);
11237 /* Create the binfo hierarchy for REF with (possibly NULL) base list
11238 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
11239 access_* node, and the TREE_VALUE is the type of the base-class.
11240 Non-NULL TREE_TYPE indicates virtual inheritance.
11242 Returns true if the binfo hierarchy was successfully created,
11243 false if an error was detected. */
11246 xref_basetypes (tree ref, tree base_list)
11249 tree binfo, base_binfo;
11250 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
11251 unsigned max_bases = 0; /* Maximum direct bases. */
11253 tree default_access;
11254 tree igo_prev; /* Track Inheritance Graph Order. */
11256 if (ref == error_mark_node)
11259 /* The base of a derived class is private by default, all others are
11261 default_access = (TREE_CODE (ref) == RECORD_TYPE
11262 && CLASSTYPE_DECLARED_CLASS (ref)
11263 ? access_private_node : access_public_node);
11265 /* First, make sure that any templates in base-classes are
11266 instantiated. This ensures that if we call ourselves recursively
11267 we do not get confused about which classes are marked and which
11269 basep = &base_list;
11272 tree basetype = TREE_VALUE (*basep);
11274 if (!(processing_template_decl && uses_template_parms (basetype))
11275 && !complete_type_or_else (basetype, NULL))
11276 /* An incomplete type. Remove it from the list. */
11277 *basep = TREE_CHAIN (*basep);
11281 if (TREE_TYPE (*basep))
11283 if (CLASS_TYPE_P (basetype))
11284 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
11285 basep = &TREE_CHAIN (*basep);
11289 TYPE_MARKED_P (ref) = 1;
11291 /* The binfo slot should be empty, unless this is an (ill-formed)
11293 if (TYPE_BINFO (ref) && !TYPE_SIZE (ref))
11295 error ("redefinition of %q#T", ref);
11299 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
11301 binfo = make_tree_binfo (max_bases);
11303 TYPE_BINFO (ref) = binfo;
11304 BINFO_OFFSET (binfo) = size_zero_node;
11305 BINFO_TYPE (binfo) = ref;
11307 /* Apply base-class info set up to the variants of this type. */
11308 fixup_type_variants (ref);
11312 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
11313 /* An aggregate cannot have baseclasses. */
11314 CLASSTYPE_NON_AGGREGATE (ref) = 1;
11316 if (TREE_CODE (ref) == UNION_TYPE)
11318 error ("derived union %qT invalid", ref);
11325 if (TYPE_FOR_JAVA (ref))
11327 error ("Java class %qT cannot have multiple bases", ref);
11334 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
11336 if (TYPE_FOR_JAVA (ref))
11338 error ("Java class %qT cannot have virtual bases", ref);
11343 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
11345 tree access = TREE_PURPOSE (base_list);
11346 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
11347 tree basetype = TREE_VALUE (base_list);
11349 if (access == access_default_node)
11350 access = default_access;
11352 if (PACK_EXPANSION_P (basetype))
11353 basetype = PACK_EXPANSION_PATTERN (basetype);
11354 if (TREE_CODE (basetype) == TYPE_DECL)
11355 basetype = TREE_TYPE (basetype);
11356 if (!MAYBE_CLASS_TYPE_P (basetype) || TREE_CODE (basetype) == UNION_TYPE)
11358 error ("base type %qT fails to be a struct or class type",
11363 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
11364 TYPE_FOR_JAVA (ref) = 1;
11366 base_binfo = NULL_TREE;
11367 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
11369 base_binfo = TYPE_BINFO (basetype);
11370 /* The original basetype could have been a typedef'd type. */
11371 basetype = BINFO_TYPE (base_binfo);
11373 /* Inherit flags from the base. */
11374 TYPE_HAS_NEW_OPERATOR (ref)
11375 |= TYPE_HAS_NEW_OPERATOR (basetype);
11376 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
11377 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
11378 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
11379 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
11380 CLASSTYPE_DIAMOND_SHAPED_P (ref)
11381 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
11382 CLASSTYPE_REPEATED_BASE_P (ref)
11383 |= CLASSTYPE_REPEATED_BASE_P (basetype);
11386 /* We must do this test after we've seen through a typedef
11388 if (TYPE_MARKED_P (basetype))
11390 if (basetype == ref)
11391 error ("recursive type %qT undefined", basetype);
11393 error ("duplicate base type %qT invalid", basetype);
11397 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
11398 /* Regenerate the pack expansion for the bases. */
11399 basetype = make_pack_expansion (basetype);
11401 TYPE_MARKED_P (basetype) = 1;
11403 base_binfo = copy_binfo (base_binfo, basetype, ref,
11404 &igo_prev, via_virtual);
11405 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
11406 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
11408 BINFO_BASE_APPEND (binfo, base_binfo);
11409 BINFO_BASE_ACCESS_APPEND (binfo, access);
11412 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
11413 /* If we have space in the vbase vector, we must have shared at
11414 least one of them, and are therefore diamond shaped. */
11415 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
11417 /* Unmark all the types. */
11418 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
11419 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11420 TYPE_MARKED_P (ref) = 0;
11422 /* Now see if we have a repeated base type. */
11423 if (!CLASSTYPE_REPEATED_BASE_P (ref))
11425 for (base_binfo = binfo; base_binfo;
11426 base_binfo = TREE_CHAIN (base_binfo))
11428 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11430 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
11433 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
11435 for (base_binfo = binfo; base_binfo;
11436 base_binfo = TREE_CHAIN (base_binfo))
11437 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11438 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11447 /* Copies the enum-related properties from type SRC to type DST.
11448 Used with the underlying type of an enum and the enum itself. */
11450 copy_type_enum (tree dst, tree src)
11452 TYPE_MIN_VALUE (dst) = TYPE_MIN_VALUE (src);
11453 TYPE_MAX_VALUE (dst) = TYPE_MAX_VALUE (src);
11454 TYPE_SIZE (dst) = TYPE_SIZE (src);
11455 TYPE_SIZE_UNIT (dst) = TYPE_SIZE_UNIT (src);
11456 SET_TYPE_MODE (dst, TYPE_MODE (src));
11457 TYPE_PRECISION (dst) = TYPE_PRECISION (src);
11458 TYPE_ALIGN (dst) = TYPE_ALIGN (src);
11459 TYPE_USER_ALIGN (dst) = TYPE_USER_ALIGN (src);
11460 TYPE_UNSIGNED (dst) = TYPE_UNSIGNED (src);
11463 /* Begin compiling the definition of an enumeration type.
11466 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
11468 UNDERLYING_TYPE is the type that will be used as the storage for
11469 the enumeration type. This should be NULL_TREE if no storage type
11472 SCOPED_ENUM_P is true if this is a scoped enumeration type.
11474 if IS_NEW is not NULL, gets TRUE iff a new type is created.
11476 Returns the type object, as yet incomplete.
11477 Also records info about it so that build_enumerator
11478 may be used to declare the individual values as they are read. */
11481 start_enum (tree name, tree enumtype, tree underlying_type,
11482 bool scoped_enum_p, bool *is_new)
11484 tree prevtype = NULL_TREE;
11485 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11489 /* [C++0x dcl.enum]p5:
11491 If not explicitly specified, the underlying type of a scoped
11492 enumeration type is int. */
11493 if (!underlying_type && scoped_enum_p)
11494 underlying_type = integer_type_node;
11496 if (underlying_type)
11497 underlying_type = cv_unqualified (underlying_type);
11499 /* If this is the real definition for a previous forward reference,
11500 fill in the contents in the same object that used to be the
11501 forward reference. */
11503 enumtype = lookup_and_check_tag (enum_type, name,
11504 /*tag_scope=*/ts_current,
11505 /*template_header_p=*/false);
11507 /* In case of a template_decl, the only check that should be deferred
11508 to instantiation time is the comparison of underlying types. */
11509 if (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE)
11511 if (scoped_enum_p != SCOPED_ENUM_P (enumtype))
11513 error_at (input_location, "scoped/unscoped mismatch "
11514 "in enum %q#T", enumtype);
11515 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11516 "previous definition here");
11517 enumtype = error_mark_node;
11519 else if (ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) != !! underlying_type)
11521 error_at (input_location, "underlying type mismatch "
11522 "in enum %q#T", enumtype);
11523 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11524 "previous definition here");
11525 enumtype = error_mark_node;
11527 else if (underlying_type && ENUM_UNDERLYING_TYPE (enumtype)
11528 && !dependent_type_p (underlying_type)
11529 && !dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype))
11530 && !same_type_p (underlying_type,
11531 ENUM_UNDERLYING_TYPE (enumtype)))
11533 error_at (input_location, "different underlying type "
11534 "in enum %q#T", enumtype);
11535 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11536 "previous definition here");
11537 underlying_type = NULL_TREE;
11541 if (!enumtype || TREE_CODE (enumtype) != ENUMERAL_TYPE
11542 || processing_template_decl)
11544 /* In case of error, make a dummy enum to allow parsing to
11546 if (enumtype == error_mark_node)
11548 name = make_anon_name ();
11549 enumtype = NULL_TREE;
11552 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
11553 of an opaque enum, or an opaque enum of an already defined
11554 enumeration (C++0x only).
11555 In any other case, it'll be NULL_TREE. */
11561 prevtype = enumtype;
11562 enumtype = cxx_make_type (ENUMERAL_TYPE);
11563 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
11564 if (enumtype == error_mark_node)
11565 return error_mark_node;
11567 /* The enum is considered opaque until the opening '{' of the
11568 enumerator list. */
11569 SET_OPAQUE_ENUM_P (enumtype, true);
11570 ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) = !! underlying_type;
11573 SET_SCOPED_ENUM_P (enumtype, scoped_enum_p);
11575 if (underlying_type)
11577 if (CP_INTEGRAL_TYPE_P (underlying_type))
11579 copy_type_enum (enumtype, underlying_type);
11580 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
11582 else if (dependent_type_p (underlying_type))
11583 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
11585 error ("underlying type %<%T%> of %<%T%> must be an integral type",
11586 underlying_type, enumtype);
11589 /* If into a template class, the returned enum is always the first
11590 declaration (opaque or not) seen. This way all the references to
11591 this type will be to the same declaration. The following ones are used
11592 only to check for definition errors. */
11593 if (prevtype && processing_template_decl)
11599 /* After processing and defining all the values of an enumeration type,
11600 install their decls in the enumeration type.
11601 ENUMTYPE is the type object. */
11604 finish_enum_value_list (tree enumtype)
11607 tree underlying_type;
11610 tree minnode, maxnode;
11613 bool fixed_underlying_type_p
11614 = ENUM_UNDERLYING_TYPE (enumtype) != NULL_TREE;
11616 /* We built up the VALUES in reverse order. */
11617 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
11619 /* For an enum defined in a template, just set the type of the values;
11620 all further processing is postponed until the template is
11621 instantiated. We need to set the type so that tsubst of a CONST_DECL
11623 if (processing_template_decl)
11625 for (values = TYPE_VALUES (enumtype);
11627 values = TREE_CHAIN (values))
11628 TREE_TYPE (TREE_VALUE (values)) = enumtype;
11632 /* Determine the minimum and maximum values of the enumerators. */
11633 if (TYPE_VALUES (enumtype))
11635 minnode = maxnode = NULL_TREE;
11637 for (values = TYPE_VALUES (enumtype);
11639 values = TREE_CHAIN (values))
11641 decl = TREE_VALUE (values);
11643 /* [dcl.enum]: Following the closing brace of an enum-specifier,
11644 each enumerator has the type of its enumeration. Prior to the
11645 closing brace, the type of each enumerator is the type of its
11646 initializing value. */
11647 TREE_TYPE (decl) = enumtype;
11649 /* Update the minimum and maximum values, if appropriate. */
11650 value = DECL_INITIAL (decl);
11651 if (value == error_mark_node)
11652 value = integer_zero_node;
11653 /* Figure out what the minimum and maximum values of the
11654 enumerators are. */
11656 minnode = maxnode = value;
11657 else if (tree_int_cst_lt (maxnode, value))
11659 else if (tree_int_cst_lt (value, minnode))
11666 If the enumerator-list is empty, the underlying type is as if
11667 the enumeration had a single enumerator with value 0. */
11668 minnode = maxnode = integer_zero_node;
11670 if (!fixed_underlying_type_p)
11672 /* Compute the number of bits require to represent all values of the
11673 enumeration. We must do this before the type of MINNODE and
11674 MAXNODE are transformed, since tree_int_cst_min_precision relies
11675 on the TREE_TYPE of the value it is passed. */
11676 bool unsignedp = tree_int_cst_sgn (minnode) >= 0;
11677 int lowprec = tree_int_cst_min_precision (minnode, unsignedp);
11678 int highprec = tree_int_cst_min_precision (maxnode, unsignedp);
11679 int precision = MAX (lowprec, highprec);
11681 bool use_short_enum;
11683 /* Determine the underlying type of the enumeration.
11687 The underlying type of an enumeration is an integral type that
11688 can represent all the enumerator values defined in the
11689 enumeration. It is implementation-defined which integral type is
11690 used as the underlying type for an enumeration except that the
11691 underlying type shall not be larger than int unless the value of
11692 an enumerator cannot fit in an int or unsigned int.
11694 We use "int" or an "unsigned int" as the underlying type, even if
11695 a smaller integral type would work, unless the user has
11696 explicitly requested that we use the smallest possible type. The
11697 user can request that for all enumerations with a command line
11698 flag, or for just one enumeration with an attribute. */
11700 use_short_enum = flag_short_enums
11701 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
11703 for (itk = (use_short_enum ? itk_char : itk_int);
11707 underlying_type = integer_types[itk];
11708 if (underlying_type != NULL_TREE
11709 && TYPE_PRECISION (underlying_type) >= precision
11710 && TYPE_UNSIGNED (underlying_type) == unsignedp)
11713 if (itk == itk_none)
11717 IF no integral type can represent all the enumerator values, the
11718 enumeration is ill-formed. */
11719 error ("no integral type can represent all of the enumerator values "
11720 "for %qT", enumtype);
11721 precision = TYPE_PRECISION (long_long_integer_type_node);
11722 underlying_type = integer_types[itk_unsigned_long_long];
11727 The value of sizeof() applied to an enumeration type, an object
11728 of an enumeration type, or an enumerator, is the value of sizeof()
11729 applied to the underlying type. */
11730 copy_type_enum (enumtype, underlying_type);
11732 /* Compute the minimum and maximum values for the type.
11736 For an enumeration where emin is the smallest enumerator and emax
11737 is the largest, the values of the enumeration are the values of the
11738 underlying type in the range bmin to bmax, where bmin and bmax are,
11739 respectively, the smallest and largest values of the smallest bit-
11740 field that can store emin and emax. */
11742 /* The middle-end currently assumes that types with TYPE_PRECISION
11743 narrower than their underlying type are suitably zero or sign
11744 extended to fill their mode. Similarly, it assumes that the front
11745 end assures that a value of a particular type must be within
11746 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
11748 We used to set these fields based on bmin and bmax, but that led
11749 to invalid assumptions like optimizing away bounds checking. So
11750 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
11751 TYPE_MAX_VALUE to the values for the mode above and only restrict
11752 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
11753 ENUM_UNDERLYING_TYPE (enumtype)
11754 = build_distinct_type_copy (underlying_type);
11755 TYPE_PRECISION (ENUM_UNDERLYING_TYPE (enumtype)) = precision;
11756 set_min_and_max_values_for_integral_type
11757 (ENUM_UNDERLYING_TYPE (enumtype), precision, unsignedp);
11759 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
11760 if (flag_strict_enums)
11761 set_min_and_max_values_for_integral_type (enumtype, precision,
11765 underlying_type = ENUM_UNDERLYING_TYPE (enumtype);
11767 /* Convert each of the enumerators to the type of the underlying
11768 type of the enumeration. */
11769 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
11771 location_t saved_location;
11773 decl = TREE_VALUE (values);
11774 saved_location = input_location;
11775 input_location = DECL_SOURCE_LOCATION (decl);
11776 if (fixed_underlying_type_p)
11777 /* If the enumeration type has a fixed underlying type, we
11778 already checked all of the enumerator values. */
11779 value = DECL_INITIAL (decl);
11781 value = perform_implicit_conversion (underlying_type,
11782 DECL_INITIAL (decl),
11783 tf_warning_or_error);
11784 input_location = saved_location;
11786 /* Do not clobber shared ints. */
11787 value = copy_node (value);
11789 TREE_TYPE (value) = enumtype;
11790 DECL_INITIAL (decl) = value;
11793 /* Fix up all variant types of this enum type. */
11794 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
11795 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
11797 /* Finish debugging output for this type. */
11798 rest_of_type_compilation (enumtype, namespace_bindings_p ());
11801 /* Finishes the enum type. This is called only the first time an
11802 enumeration is seen, be it opaque or odinary.
11803 ENUMTYPE is the type object. */
11806 finish_enum (tree enumtype)
11808 if (processing_template_decl)
11810 if (at_function_scope_p ())
11811 add_stmt (build_min (TAG_DEFN, enumtype));
11815 /* Here there should not be any variants of this type. */
11816 gcc_assert (enumtype == TYPE_MAIN_VARIANT (enumtype)
11817 && !TYPE_NEXT_VARIANT (enumtype));
11820 /* Build and install a CONST_DECL for an enumeration constant of the
11821 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
11822 LOC is the location of NAME.
11823 Assignment of sequential values by default is handled here. */
11826 build_enumerator (tree name, tree value, tree enumtype, location_t loc)
11832 /* If the VALUE was erroneous, pretend it wasn't there; that will
11833 result in the enum being assigned the next value in sequence. */
11834 if (value == error_mark_node)
11837 /* Remove no-op casts from the value. */
11839 STRIP_TYPE_NOPS (value);
11841 if (! processing_template_decl)
11843 /* Validate and default VALUE. */
11844 if (value != NULL_TREE)
11846 value = cxx_constant_value (value);
11848 if (TREE_CODE (value) == INTEGER_CST)
11850 value = perform_integral_promotions (value);
11854 error ("enumerator value for %qD is not an integer constant", name);
11859 /* Default based on previous value. */
11860 if (value == NULL_TREE)
11862 if (TYPE_VALUES (enumtype))
11865 unsigned HOST_WIDE_INT lo;
11869 /* The next value is the previous value plus one.
11870 add_double doesn't know the type of the target expression,
11871 so we must check with int_fits_type_p as well. */
11872 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
11873 if (error_operand_p (prev_value))
11874 value = error_mark_node;
11877 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
11878 TREE_INT_CST_HIGH (prev_value),
11880 value = build_int_cst_wide (TREE_TYPE (prev_value), lo, hi);
11882 |= !int_fits_type_p (value, TREE_TYPE (prev_value));
11886 error ("overflow in enumeration values at %qD", name);
11887 value = error_mark_node;
11892 value = integer_zero_node;
11895 /* Remove no-op casts from the value. */
11896 STRIP_TYPE_NOPS (value);
11898 /* If the underlying type of the enum is fixed, check whether
11899 the enumerator values fits in the underlying type. If it
11900 does not fit, the program is ill-formed [C++0x dcl.enum]. */
11901 if (ENUM_UNDERLYING_TYPE (enumtype)
11903 && TREE_CODE (value) == INTEGER_CST
11904 && !int_fits_type_p (value, ENUM_UNDERLYING_TYPE (enumtype)))
11906 error ("enumerator value %E is too large for underlying type %<%T%>",
11907 value, ENUM_UNDERLYING_TYPE (enumtype));
11909 /* Silently convert the value so that we can continue. */
11910 value = perform_implicit_conversion (ENUM_UNDERLYING_TYPE (enumtype),
11915 /* C++ associates enums with global, function, or class declarations. */
11916 context = current_scope ();
11918 /* Build the actual enumeration constant. Note that the enumeration
11919 constants have the underlying type of the enum (if it is fixed)
11920 or the type of their initializer (if the underlying type of the
11921 enum is not fixed):
11925 If the underlying type is fixed, the type of each enumerator
11926 prior to the closing brace is the underlying type; if the
11927 initializing value of an enumerator cannot be represented by
11928 the underlying type, the program is ill-formed. If the
11929 underlying type is not fixed, the type of each enumerator is
11930 the type of its initializing value.
11932 If the underlying type is not fixed, it will be computed by
11933 finish_enum and we will reset the type of this enumerator. Of
11934 course, if we're processing a template, there may be no value. */
11935 type = value ? TREE_TYPE (value) : NULL_TREE;
11937 if (context && context == current_class_type)
11938 /* This enum declaration is local to the class. We need the full
11939 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
11940 decl = build_lang_decl_loc (loc, CONST_DECL, name, type);
11942 /* It's a global enum, or it's local to a function. (Note local to
11943 a function could mean local to a class method. */
11944 decl = build_decl (loc, CONST_DECL, name, type);
11946 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
11947 TREE_CONSTANT (decl) = 1;
11948 TREE_READONLY (decl) = 1;
11949 DECL_INITIAL (decl) = value;
11951 if (context && context == current_class_type && !SCOPED_ENUM_P (enumtype))
11952 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
11953 on the TYPE_FIELDS list for `S'. (That's so that you can say
11954 things like `S::i' later.) */
11955 finish_member_declaration (decl);
11959 /* Add this enumeration constant to the list for this type. */
11960 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
11963 /* Look for an enumerator with the given NAME within the enumeration
11964 type ENUMTYPE. This routine is used primarily for qualified name
11965 lookup into an enumerator in C++0x, e.g.,
11967 enum class Color { Red, Green, Blue };
11969 Color color = Color::Red;
11971 Returns the value corresponding to the enumerator, or
11972 NULL_TREE if no such enumerator was found. */
11974 lookup_enumerator (tree enumtype, tree name)
11977 gcc_assert (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE);
11979 e = purpose_member (name, TYPE_VALUES (enumtype));
11980 return e? TREE_VALUE (e) : NULL_TREE;
11984 /* We're defining DECL. Make sure that its type is OK. */
11987 check_function_type (tree decl, tree current_function_parms)
11989 tree fntype = TREE_TYPE (decl);
11990 tree return_type = complete_type (TREE_TYPE (fntype));
11992 /* In a function definition, arg types must be complete. */
11993 require_complete_types_for_parms (current_function_parms);
11995 if (dependent_type_p (return_type))
11997 if (!COMPLETE_OR_VOID_TYPE_P (return_type)
11998 || (TYPE_FOR_JAVA (return_type) && MAYBE_CLASS_TYPE_P (return_type)))
12000 tree args = TYPE_ARG_TYPES (fntype);
12002 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
12003 error ("return type %q#T is incomplete", return_type);
12005 error ("return type has Java class type %q#T", return_type);
12007 /* Make it return void instead. */
12008 if (TREE_CODE (fntype) == METHOD_TYPE)
12009 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
12011 TREE_CHAIN (args));
12013 fntype = build_function_type (void_type_node, args);
12015 = build_exception_variant (fntype,
12016 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
12017 fntype = (cp_build_type_attribute_variant
12018 (fntype, TYPE_ATTRIBUTES (TREE_TYPE (decl))));
12019 TREE_TYPE (decl) = fntype;
12022 abstract_virtuals_error (decl, TREE_TYPE (fntype));
12025 /* Create the FUNCTION_DECL for a function definition.
12026 DECLSPECS and DECLARATOR are the parts of the declaration;
12027 they describe the function's name and the type it returns,
12028 but twisted together in a fashion that parallels the syntax of C.
12030 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
12031 DECLARATOR is really the DECL for the function we are about to
12032 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
12033 indicating that the function is an inline defined in-class.
12035 This function creates a binding context for the function body
12036 as well as setting up the FUNCTION_DECL in current_function_decl.
12038 For C++, we must first check whether that datum makes any sense.
12039 For example, "class A local_a(1,2);" means that variable local_a
12040 is an aggregate of type A, which should have a constructor
12041 applied to it with the argument list [1, 2].
12043 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
12044 or may be a BLOCK if the function has been defined previously
12045 in this translation unit. On exit, DECL_INITIAL (decl1) will be
12046 error_mark_node if the function has never been defined, or
12047 a BLOCK if the function has been defined somewhere. */
12050 start_preparsed_function (tree decl1, tree attrs, int flags)
12052 tree ctype = NULL_TREE;
12055 int doing_friend = 0;
12056 struct cp_binding_level *bl;
12057 tree current_function_parms;
12058 struct c_fileinfo *finfo
12059 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
12060 bool honor_interface;
12062 /* Sanity check. */
12063 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
12064 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
12066 fntype = TREE_TYPE (decl1);
12067 if (TREE_CODE (fntype) == METHOD_TYPE)
12068 ctype = TYPE_METHOD_BASETYPE (fntype);
12070 /* ISO C++ 11.4/5. A friend function defined in a class is in
12071 the (lexical) scope of the class in which it is defined. */
12072 if (!ctype && DECL_FRIEND_P (decl1))
12074 ctype = DECL_FRIEND_CONTEXT (decl1);
12076 /* CTYPE could be null here if we're dealing with a template;
12077 for example, `inline friend float foo()' inside a template
12078 will have no CTYPE set. */
12079 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
12085 if (DECL_DECLARED_INLINE_P (decl1)
12086 && lookup_attribute ("noinline", attrs))
12087 warning (0, "inline function %q+D given attribute noinline", decl1);
12089 /* Handle gnu_inline attribute. */
12090 if (GNU_INLINE_P (decl1))
12092 DECL_EXTERNAL (decl1) = 1;
12093 DECL_NOT_REALLY_EXTERN (decl1) = 0;
12094 DECL_INTERFACE_KNOWN (decl1) = 1;
12095 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
12098 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
12099 /* This is a constructor, we must ensure that any default args
12100 introduced by this definition are propagated to the clones
12101 now. The clones are used directly in overload resolution. */
12102 adjust_clone_args (decl1);
12104 /* Sometimes we don't notice that a function is a static member, and
12105 build a METHOD_TYPE for it. Fix that up now. */
12106 if (ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
12107 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE)
12109 revert_static_member_fn (decl1);
12113 /* Set up current_class_type, and enter the scope of the class, if
12116 push_nested_class (ctype);
12117 else if (DECL_STATIC_FUNCTION_P (decl1))
12118 push_nested_class (DECL_CONTEXT (decl1));
12120 /* Now that we have entered the scope of the class, we must restore
12121 the bindings for any template parameters surrounding DECL1, if it
12122 is an inline member template. (Order is important; consider the
12123 case where a template parameter has the same name as a field of
12124 the class.) It is not until after this point that
12125 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
12126 if (flags & SF_INCLASS_INLINE)
12127 maybe_begin_member_template_processing (decl1);
12129 /* Effective C++ rule 15. */
12131 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
12132 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
12133 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
12135 /* Make the init_value nonzero so pushdecl knows this is not tentative.
12136 error_mark_node is replaced below (in poplevel) with the BLOCK. */
12137 if (!DECL_INITIAL (decl1))
12138 DECL_INITIAL (decl1) = error_mark_node;
12140 /* This function exists in static storage.
12141 (This does not mean `static' in the C sense!) */
12142 TREE_STATIC (decl1) = 1;
12144 /* We must call push_template_decl after current_class_type is set
12145 up. (If we are processing inline definitions after exiting a
12146 class scope, current_class_type will be NULL_TREE until set above
12147 by push_nested_class.) */
12148 if (processing_template_decl)
12150 /* FIXME: Handle error_mark_node more gracefully. */
12151 tree newdecl1 = push_template_decl (decl1);
12152 if (newdecl1 != error_mark_node)
12156 /* We are now in the scope of the function being defined. */
12157 current_function_decl = decl1;
12159 /* Save the parm names or decls from this function's declarator
12160 where store_parm_decls will find them. */
12161 current_function_parms = DECL_ARGUMENTS (decl1);
12163 /* Make sure the parameter and return types are reasonable. When
12164 you declare a function, these types can be incomplete, but they
12165 must be complete when you define the function. */
12166 check_function_type (decl1, current_function_parms);
12168 /* Build the return declaration for the function. */
12169 restype = TREE_TYPE (fntype);
12170 if (DECL_RESULT (decl1) == NULL_TREE)
12174 resdecl = build_decl (input_location, RESULT_DECL, 0, restype);
12175 DECL_ARTIFICIAL (resdecl) = 1;
12176 DECL_IGNORED_P (resdecl) = 1;
12177 DECL_RESULT (decl1) = resdecl;
12179 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
12182 /* Let the user know we're compiling this function. */
12183 announce_function (decl1);
12185 /* Record the decl so that the function name is defined.
12186 If we already have a decl for this name, and it is a FUNCTION_DECL,
12187 use the old decl. */
12188 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
12190 /* A specialization is not used to guide overload resolution. */
12191 if (!DECL_FUNCTION_MEMBER_P (decl1)
12192 && !(DECL_USE_TEMPLATE (decl1) &&
12193 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
12195 tree olddecl = pushdecl (decl1);
12197 if (olddecl == error_mark_node)
12198 /* If something went wrong when registering the declaration,
12199 use DECL1; we have to have a FUNCTION_DECL to use when
12200 parsing the body of the function. */
12204 /* Otherwise, OLDDECL is either a previous declaration
12205 of the same function or DECL1 itself. */
12207 if (warn_missing_declarations
12208 && olddecl == decl1
12209 && !DECL_MAIN_P (decl1)
12210 && TREE_PUBLIC (decl1)
12211 && !DECL_DECLARED_INLINE_P (decl1))
12215 /* Check whether DECL1 is in an anonymous
12217 for (context = DECL_CONTEXT (decl1);
12219 context = DECL_CONTEXT (context))
12221 if (TREE_CODE (context) == NAMESPACE_DECL
12222 && DECL_NAME (context) == NULL_TREE)
12226 if (context == NULL)
12227 warning (OPT_Wmissing_declarations,
12228 "no previous declaration for %q+D", decl1);
12236 /* We need to set the DECL_CONTEXT. */
12237 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
12238 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
12240 fntype = TREE_TYPE (decl1);
12242 /* If #pragma weak applies, mark the decl appropriately now.
12243 The pragma only applies to global functions. Because
12244 determining whether or not the #pragma applies involves
12245 computing the mangled name for the declaration, we cannot
12246 apply the pragma until after we have merged this declaration
12247 with any previous declarations; if the original declaration
12248 has a linkage specification, that specification applies to
12249 the definition as well, and may affect the mangled name. */
12250 if (DECL_FILE_SCOPE_P (decl1))
12251 maybe_apply_pragma_weak (decl1);
12254 /* constexpr functions must have literal argument types and
12255 literal return type. */
12256 validate_constexpr_fundecl (decl1);
12258 /* Reset this in case the call to pushdecl changed it. */
12259 current_function_decl = decl1;
12261 gcc_assert (DECL_INITIAL (decl1));
12263 /* This function may already have been parsed, in which case just
12264 return; our caller will skip over the body without parsing. */
12265 if (DECL_INITIAL (decl1) != error_mark_node)
12268 /* Initialize RTL machinery. We cannot do this until
12269 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
12270 even when processing a template; this is how we get
12271 CFUN set up, and our per-function variables initialized.
12272 FIXME factor out the non-RTL stuff. */
12273 bl = current_binding_level;
12274 allocate_struct_function (decl1, processing_template_decl);
12276 /* Initialize the language data structures. Whenever we start
12277 a new function, we destroy temporaries in the usual way. */
12278 cfun->language = ggc_alloc_cleared_language_function ();
12279 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
12280 current_binding_level = bl;
12282 /* Even though we're inside a function body, we still don't want to
12283 call expand_expr to calculate the size of a variable-sized array.
12284 We haven't necessarily assigned RTL to all variables yet, so it's
12285 not safe to try to expand expressions involving them. */
12286 cfun->dont_save_pending_sizes_p = 1;
12288 /* Start the statement-tree, start the tree now. */
12289 DECL_SAVED_TREE (decl1) = push_stmt_list ();
12291 /* If we are (erroneously) defining a function that we have already
12292 defined before, wipe out what we knew before. */
12293 if (!DECL_PENDING_INLINE_P (decl1))
12294 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
12296 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
12298 /* We know that this was set up by `grokclassfn'. We do not
12299 wait until `store_parm_decls', since evil parse errors may
12300 never get us to that point. Here we keep the consistency
12301 between `current_class_type' and `current_class_ptr'. */
12302 tree t = DECL_ARGUMENTS (decl1);
12304 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
12305 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
12307 cp_function_chain->x_current_class_ref
12308 = cp_build_indirect_ref (t, RO_NULL, tf_warning_or_error);
12309 cp_function_chain->x_current_class_ptr = t;
12311 /* Constructors and destructors need to know whether they're "in
12312 charge" of initializing virtual base classes. */
12313 t = DECL_CHAIN (t);
12314 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
12316 current_in_charge_parm = t;
12317 t = DECL_CHAIN (t);
12319 if (DECL_HAS_VTT_PARM_P (decl1))
12321 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
12322 current_vtt_parm = t;
12326 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
12327 /* Implicitly-defined methods (like the
12328 destructor for a class in which no destructor
12329 is explicitly declared) must not be defined
12330 until their definition is needed. So, we
12331 ignore interface specifications for
12332 compiler-generated functions. */
12333 && !DECL_ARTIFICIAL (decl1));
12335 if (DECL_INTERFACE_KNOWN (decl1))
12337 tree ctx = decl_function_context (decl1);
12339 if (DECL_NOT_REALLY_EXTERN (decl1))
12340 DECL_EXTERNAL (decl1) = 0;
12342 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
12343 && TREE_PUBLIC (ctx))
12344 /* This is a function in a local class in an extern inline
12346 comdat_linkage (decl1);
12348 /* If this function belongs to an interface, it is public.
12349 If it belongs to someone else's interface, it is also external.
12350 This only affects inlines and template instantiations. */
12351 else if (!finfo->interface_unknown && honor_interface)
12353 if (DECL_DECLARED_INLINE_P (decl1)
12354 || DECL_TEMPLATE_INSTANTIATION (decl1)
12355 || processing_template_decl)
12357 DECL_EXTERNAL (decl1)
12358 = (finfo->interface_only
12359 || (DECL_DECLARED_INLINE_P (decl1)
12360 && ! flag_implement_inlines
12361 && !DECL_VINDEX (decl1)));
12363 /* For WIN32 we also want to put these in linkonce sections. */
12364 maybe_make_one_only (decl1);
12367 DECL_EXTERNAL (decl1) = 0;
12368 DECL_INTERFACE_KNOWN (decl1) = 1;
12369 /* If this function is in an interface implemented in this file,
12370 make sure that the back end knows to emit this function
12372 if (!DECL_EXTERNAL (decl1))
12373 mark_needed (decl1);
12375 else if (finfo->interface_unknown && finfo->interface_only
12376 && honor_interface)
12378 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
12379 interface, we will have both finfo->interface_unknown and
12380 finfo->interface_only set. In that case, we don't want to
12381 use the normal heuristics because someone will supply a
12382 #pragma implementation elsewhere, and deducing it here would
12383 produce a conflict. */
12384 comdat_linkage (decl1);
12385 DECL_EXTERNAL (decl1) = 0;
12386 DECL_INTERFACE_KNOWN (decl1) = 1;
12387 DECL_DEFER_OUTPUT (decl1) = 1;
12391 /* This is a definition, not a reference.
12392 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
12393 if (!GNU_INLINE_P (decl1))
12394 DECL_EXTERNAL (decl1) = 0;
12396 if ((DECL_DECLARED_INLINE_P (decl1)
12397 || DECL_TEMPLATE_INSTANTIATION (decl1))
12398 && ! DECL_INTERFACE_KNOWN (decl1))
12399 DECL_DEFER_OUTPUT (decl1) = 1;
12401 DECL_INTERFACE_KNOWN (decl1) = 1;
12404 /* Determine the ELF visibility attribute for the function. We must not
12405 do this before calling "pushdecl", as we must allow "duplicate_decls"
12406 to merge any attributes appropriately. We also need to wait until
12408 if (!DECL_CLONED_FUNCTION_P (decl1))
12409 determine_visibility (decl1);
12411 begin_scope (sk_function_parms, decl1);
12415 if (DECL_DESTRUCTOR_P (decl1)
12416 || (DECL_CONSTRUCTOR_P (decl1)
12417 && targetm.cxx.cdtor_returns_this ()))
12419 cdtor_label = build_decl (input_location,
12420 LABEL_DECL, NULL_TREE, NULL_TREE);
12421 DECL_CONTEXT (cdtor_label) = current_function_decl;
12424 start_fname_decls ();
12426 store_parm_decls (current_function_parms);
12430 /* Like start_preparsed_function, except that instead of a
12431 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
12433 Returns 1 on success. If the DECLARATOR is not suitable for a function
12434 (it defines a datum instead), we return 0, which tells
12435 yyparse to report a parse error. */
12438 start_function (cp_decl_specifier_seq *declspecs,
12439 const cp_declarator *declarator,
12444 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
12445 if (decl1 == error_mark_node)
12447 /* If the declarator is not suitable for a function definition,
12448 cause a syntax error. */
12449 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
12451 error ("invalid function declaration");
12455 if (DECL_MAIN_P (decl1))
12456 /* main must return int. grokfndecl should have corrected it
12457 (and issued a diagnostic) if the user got it wrong. */
12458 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
12459 integer_type_node));
12461 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
12466 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
12470 use_eh_spec_block (tree fn)
12472 return (flag_exceptions && flag_enforce_eh_specs
12473 && !processing_template_decl
12474 && !type_throw_all_p (TREE_TYPE (fn))
12475 /* We insert the EH_SPEC_BLOCK only in the original
12476 function; then, it is copied automatically to the
12478 && !DECL_CLONED_FUNCTION_P (fn)
12479 /* Implicitly-generated constructors and destructors have
12480 exception specifications. However, those specifications
12481 are the union of the possible exceptions specified by the
12482 constructors/destructors for bases and members, so no
12483 unallowed exception will ever reach this function. By
12484 not creating the EH_SPEC_BLOCK we save a little memory,
12485 and we avoid spurious warnings about unreachable
12487 && !DECL_ARTIFICIAL (fn));
12490 /* Store the parameter declarations into the current function declaration.
12491 This is called after parsing the parameter declarations, before
12492 digesting the body of the function.
12494 Also install to binding contour return value identifier, if any. */
12497 store_parm_decls (tree current_function_parms)
12499 tree fndecl = current_function_decl;
12502 /* This is a chain of any other decls that came in among the parm
12503 declarations. If a parm is declared with enum {foo, bar} x;
12504 then CONST_DECLs for foo and bar are put here. */
12505 tree nonparms = NULL_TREE;
12507 if (current_function_parms)
12509 /* This case is when the function was defined with an ANSI prototype.
12510 The parms already have decls, so we need not do anything here
12511 except record them as in effect
12512 and complain if any redundant old-style parm decls were written. */
12514 tree specparms = current_function_parms;
12517 /* Must clear this because it might contain TYPE_DECLs declared
12519 current_binding_level->names = NULL;
12521 /* If we're doing semantic analysis, then we'll call pushdecl
12522 for each of these. We must do them in reverse order so that
12523 they end in the correct forward order. */
12524 specparms = nreverse (specparms);
12526 for (parm = specparms; parm; parm = next)
12528 next = DECL_CHAIN (parm);
12529 if (TREE_CODE (parm) == PARM_DECL)
12531 if (DECL_NAME (parm) == NULL_TREE
12532 || TREE_CODE (parm) != VOID_TYPE)
12535 error ("parameter %qD declared void", parm);
12539 /* If we find an enum constant or a type tag,
12540 put it aside for the moment. */
12541 TREE_CHAIN (parm) = NULL_TREE;
12542 nonparms = chainon (nonparms, parm);
12546 /* Get the decls in their original chain order and record in the
12547 function. This is all and only the PARM_DECLs that were
12548 pushed into scope by the loop above. */
12549 DECL_ARGUMENTS (fndecl) = getdecls ();
12552 DECL_ARGUMENTS (fndecl) = NULL_TREE;
12554 /* Now store the final chain of decls for the arguments
12555 as the decl-chain of the current lexical scope.
12556 Put the enumerators in as well, at the front so that
12557 DECL_ARGUMENTS is not modified. */
12558 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
12560 if (use_eh_spec_block (current_function_decl))
12561 current_eh_spec_block = begin_eh_spec_block ();
12565 /* We have finished doing semantic analysis on DECL, but have not yet
12566 generated RTL for its body. Save away our current state, so that
12567 when we want to generate RTL later we know what to do. */
12570 save_function_data (tree decl)
12572 struct language_function *f;
12574 /* Save the language-specific per-function data so that we can
12575 get it back when we really expand this function. */
12576 gcc_assert (!DECL_PENDING_INLINE_P (decl));
12579 f = ggc_alloc_language_function ();
12580 memcpy (f, cp_function_chain, sizeof (struct language_function));
12581 DECL_SAVED_FUNCTION_DATA (decl) = f;
12583 /* Clear out the bits we don't need. */
12584 f->base.x_stmt_tree.x_cur_stmt_list = NULL_TREE;
12585 f->bindings = NULL;
12586 f->x_local_names = NULL;
12590 /* Set the return value of the constructor (if present). */
12593 finish_constructor_body (void)
12598 if (targetm.cxx.cdtor_returns_this ()
12599 && (! TYPE_FOR_JAVA (current_class_type)))
12601 /* Any return from a constructor will end up here. */
12602 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
12604 val = DECL_ARGUMENTS (current_function_decl);
12605 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
12606 DECL_RESULT (current_function_decl), val);
12607 /* Return the address of the object. */
12608 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
12609 add_stmt (exprstmt);
12613 /* Do all the processing for the beginning of a destructor; set up the
12614 vtable pointers and cleanups for bases and members. */
12617 begin_destructor_body (void)
12619 tree compound_stmt;
12621 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
12622 issued an error message. We still want to try to process the
12623 body of the function, but initialize_vtbl_ptrs will crash if
12624 TYPE_BINFO is NULL. */
12625 if (COMPLETE_TYPE_P (current_class_type))
12627 compound_stmt = begin_compound_stmt (0);
12628 /* Make all virtual function table pointers in non-virtual base
12629 classes point to CURRENT_CLASS_TYPE's virtual function
12631 initialize_vtbl_ptrs (current_class_ptr);
12632 finish_compound_stmt (compound_stmt);
12634 /* And insert cleanups for our bases and members so that they
12635 will be properly destroyed if we throw. */
12636 push_base_cleanups ();
12640 /* At the end of every destructor we generate code to delete the object if
12641 necessary. Do that now. */
12644 finish_destructor_body (void)
12648 /* Any return from a destructor will end up here; that way all base
12649 and member cleanups will be run when the function returns. */
12650 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
12652 /* In a virtual destructor, we must call delete. */
12653 if (DECL_VIRTUAL_P (current_function_decl))
12656 tree virtual_size = cxx_sizeof (current_class_type);
12660 At the point of definition of a virtual destructor (including
12661 an implicit definition), non-placement operator delete shall
12662 be looked up in the scope of the destructor's class and if
12663 found shall be accessible and unambiguous. */
12664 exprstmt = build_op_delete_call(DELETE_EXPR, current_class_ptr,
12666 /*global_p=*/false,
12667 /*placement=*/NULL_TREE,
12668 /*alloc_fn=*/NULL_TREE);
12670 if_stmt = begin_if_stmt ();
12671 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
12672 current_in_charge_parm,
12675 finish_expr_stmt (exprstmt);
12676 finish_then_clause (if_stmt);
12677 finish_if_stmt (if_stmt);
12680 if (targetm.cxx.cdtor_returns_this ())
12684 val = DECL_ARGUMENTS (current_function_decl);
12685 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
12686 DECL_RESULT (current_function_decl), val);
12687 /* Return the address of the object. */
12688 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
12689 add_stmt (exprstmt);
12693 /* Do the necessary processing for the beginning of a function body, which
12694 in this case includes member-initializers, but not the catch clauses of
12695 a function-try-block. Currently, this means opening a binding level
12696 for the member-initializers (in a ctor) and member cleanups (in a dtor). */
12699 begin_function_body (void)
12703 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
12706 if (processing_template_decl)
12707 /* Do nothing now. */;
12709 /* Always keep the BLOCK node associated with the outermost pair of
12710 curly braces of a function. These are needed for correct
12711 operation of dwarfout.c. */
12712 keep_next_level (true);
12714 stmt = begin_compound_stmt (BCS_FN_BODY);
12716 if (processing_template_decl)
12717 /* Do nothing now. */;
12718 else if (DECL_DESTRUCTOR_P (current_function_decl))
12719 begin_destructor_body ();
12724 /* Do the processing for the end of a function body. Currently, this means
12725 closing out the cleanups for fully-constructed bases and members, and in
12726 the case of the destructor, deleting the object if desired. Again, this
12727 is only meaningful for [cd]tors, since they are the only functions where
12728 there is a significant distinction between the main body and any
12729 function catch clauses. Handling, say, main() return semantics here
12730 would be wrong, as flowing off the end of a function catch clause for
12731 main() would also need to return 0. */
12734 finish_function_body (tree compstmt)
12736 if (compstmt == NULL_TREE)
12739 /* Close the block. */
12740 finish_compound_stmt (compstmt);
12742 if (processing_template_decl)
12743 /* Do nothing now. */;
12744 else if (DECL_CONSTRUCTOR_P (current_function_decl))
12745 finish_constructor_body ();
12746 else if (DECL_DESTRUCTOR_P (current_function_decl))
12747 finish_destructor_body ();
12750 /* Given a function, returns the BLOCK corresponding to the outermost level
12751 of curly braces, skipping the artificial block created for constructor
12755 outer_curly_brace_block (tree fndecl)
12757 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
12758 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
12759 /* Skip the artificial function body block. */
12760 block = BLOCK_SUBBLOCKS (block);
12764 /* If FNDECL is a class's key method, add the class to the list of
12765 keyed classes that should be emitted. */
12768 record_key_method_defined (tree fndecl)
12770 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
12771 && DECL_VIRTUAL_P (fndecl)
12772 && !processing_template_decl)
12774 tree fnclass = DECL_CONTEXT (fndecl);
12775 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
12776 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
12780 /* Subroutine of finish_function.
12781 Save the body of constexpr functions for possible
12782 future compile time evaluation. */
12785 maybe_save_function_definition (tree fun)
12787 if (!processing_template_decl
12788 && DECL_DECLARED_CONSTEXPR_P (fun)
12789 && !DECL_CLONED_FUNCTION_P (fun))
12790 register_constexpr_fundef (fun, DECL_SAVED_TREE (fun));
12793 /* Finish up a function declaration and compile that function
12794 all the way to assembler language output. The free the storage
12795 for the function definition.
12797 FLAGS is a bitwise or of the following values:
12799 We just finished processing the body of an in-class inline
12800 function definition. (This processing will have taken place
12801 after the class definition is complete.) */
12804 finish_function (int flags)
12806 tree fndecl = current_function_decl;
12807 tree fntype, ctype = NULL_TREE;
12808 int inclass_inline = (flags & 2) != 0;
12810 /* When we get some parse errors, we can end up without a
12811 current_function_decl, so cope. */
12812 if (fndecl == NULL_TREE)
12813 return error_mark_node;
12815 if (c_dialect_objc ())
12816 objc_finish_function ();
12818 gcc_assert (!defer_mark_used_calls);
12819 defer_mark_used_calls = true;
12821 record_key_method_defined (fndecl);
12823 fntype = TREE_TYPE (fndecl);
12825 /* TREE_READONLY (fndecl) = 1;
12826 This caused &foo to be of type ptr-to-const-function
12827 which then got a warning when stored in a ptr-to-function variable. */
12829 gcc_assert (building_stmt_tree ());
12830 /* The current function is being defined, so its DECL_INITIAL should
12831 be set, and unless there's a multiple definition, it should be
12832 error_mark_node. */
12833 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
12835 /* For a cloned function, we've already got all the code we need;
12836 there's no need to add any extra bits. */
12837 if (!DECL_CLONED_FUNCTION_P (fndecl))
12839 if (DECL_MAIN_P (current_function_decl))
12843 /* Make it so that `main' always returns 0 by default (or
12846 stmt = finish_return_stmt (integer_one_node);
12848 stmt = finish_return_stmt (integer_zero_node);
12850 /* Hack. We don't want the middle-end to warn that this
12851 return is unreachable, so put the statement on the
12854 location_t linezero = linemap_line_start (line_table, 0, 1);
12855 SET_EXPR_LOCATION (stmt, linezero);
12859 if (use_eh_spec_block (current_function_decl))
12860 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
12861 (TREE_TYPE (current_function_decl)),
12862 current_eh_spec_block);
12865 /* If we're saving up tree structure, tie off the function now. */
12866 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
12868 finish_fname_decls ();
12870 /* If this function can't throw any exceptions, remember that. */
12871 if (!processing_template_decl
12872 && !cp_function_chain->can_throw
12873 && !flag_non_call_exceptions
12874 && !decl_replaceable_p (fndecl))
12875 TREE_NOTHROW (fndecl) = 1;
12877 /* This must come after expand_function_end because cleanups might
12878 have declarations (from inline functions) that need to go into
12879 this function's blocks. */
12881 /* If the current binding level isn't the outermost binding level
12882 for this function, either there is a bug, or we have experienced
12883 syntax errors and the statement tree is malformed. */
12884 if (current_binding_level->kind != sk_function_parms)
12886 /* Make sure we have already experienced errors. */
12887 gcc_assert (errorcount);
12889 /* Throw away the broken statement tree and extra binding
12891 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
12893 while (current_binding_level->kind != sk_function_parms)
12895 if (current_binding_level->kind == sk_class)
12896 pop_nested_class ();
12898 poplevel (0, 0, 0);
12901 poplevel (1, 0, 1);
12903 /* Statements should always be full-expressions at the outermost set
12904 of curly braces for a function. */
12905 gcc_assert (stmts_are_full_exprs_p ());
12907 /* Save constexpr function body before it gets munged by
12908 the NRV transformation. */
12909 maybe_save_function_definition (fndecl);
12911 /* Set up the named return value optimization, if we can. Candidate
12912 variables are selected in check_return_expr. */
12913 if (current_function_return_value)
12915 tree r = current_function_return_value;
12918 if (r != error_mark_node
12919 /* This is only worth doing for fns that return in memory--and
12920 simpler, since we don't have to worry about promoted modes. */
12921 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
12922 /* Only allow this for variables declared in the outer scope of
12923 the function so we know that their lifetime always ends with a
12924 return; see g++.dg/opt/nrv6.C. We could be more flexible if
12925 we were to do this optimization in tree-ssa. */
12926 && (outer = outer_curly_brace_block (fndecl))
12927 && chain_member (r, BLOCK_VARS (outer)))
12928 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
12930 current_function_return_value = NULL_TREE;
12933 /* Remember that we were in class scope. */
12934 if (current_class_name)
12935 ctype = current_class_type;
12937 /* Must mark the RESULT_DECL as being in this function. */
12938 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
12940 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
12941 to the FUNCTION_DECL node itself. */
12942 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
12944 /* Save away current state, if appropriate. */
12945 if (!processing_template_decl)
12946 save_function_data (fndecl);
12948 /* Complain if there's just no return statement. */
12949 if (warn_return_type
12950 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
12951 && !dependent_type_p (TREE_TYPE (fntype))
12952 && !current_function_returns_value && !current_function_returns_null
12953 /* Don't complain if we abort or throw. */
12954 && !current_function_returns_abnormally
12955 /* Don't complain if we are declared noreturn. */
12956 && !TREE_THIS_VOLATILE (fndecl)
12957 && !DECL_NAME (DECL_RESULT (fndecl))
12958 && !TREE_NO_WARNING (fndecl)
12959 /* Structor return values (if any) are set by the compiler. */
12960 && !DECL_CONSTRUCTOR_P (fndecl)
12961 && !DECL_DESTRUCTOR_P (fndecl))
12963 warning (OPT_Wreturn_type,
12964 "no return statement in function returning non-void");
12965 TREE_NO_WARNING (fndecl) = 1;
12968 /* Store the end of the function, so that we get good line number
12969 info for the epilogue. */
12970 cfun->function_end_locus = input_location;
12972 /* Complain about parameters that are only set, but never otherwise used. */
12973 if (warn_unused_but_set_parameter
12974 && !processing_template_decl
12975 && errorcount == unused_but_set_errorcount
12976 && !DECL_CLONED_FUNCTION_P (fndecl))
12980 for (decl = DECL_ARGUMENTS (fndecl);
12982 decl = DECL_CHAIN (decl))
12983 if (TREE_USED (decl)
12984 && TREE_CODE (decl) == PARM_DECL
12985 && !DECL_READ_P (decl)
12986 && DECL_NAME (decl)
12987 && !DECL_ARTIFICIAL (decl)
12988 && !TREE_NO_WARNING (decl)
12989 && !DECL_IN_SYSTEM_HEADER (decl)
12990 && TREE_TYPE (decl) != error_mark_node
12991 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
12992 && (!CLASS_TYPE_P (TREE_TYPE (decl))
12993 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
12994 warning (OPT_Wunused_but_set_parameter,
12995 "parameter %q+D set but not used", decl);
12996 unused_but_set_errorcount = errorcount;
12999 /* Genericize before inlining. */
13000 if (!processing_template_decl)
13002 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
13003 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl);
13004 cp_genericize (fndecl);
13005 /* Clear out the bits we don't need. */
13006 f->x_current_class_ptr = NULL;
13007 f->x_current_class_ref = NULL;
13008 f->x_eh_spec_block = NULL;
13009 f->x_in_charge_parm = NULL;
13010 f->x_vtt_parm = NULL;
13011 f->x_return_value = NULL;
13012 f->bindings = NULL;
13013 f->extern_decl_map = NULL;
13015 /* Clear out the bits we don't need. */
13016 local_names = NULL;
13018 /* We're leaving the context of this function, so zap cfun. It's still in
13019 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
13021 current_function_decl = NULL;
13023 /* If this is an in-class inline definition, we may have to pop the
13024 bindings for the template parameters that we added in
13025 maybe_begin_member_template_processing when start_function was
13027 if (inclass_inline)
13028 maybe_end_member_template_processing ();
13030 /* Leave the scope of the class. */
13032 pop_nested_class ();
13037 current_function_decl = NULL_TREE;
13039 defer_mark_used_calls = false;
13040 if (deferred_mark_used_calls)
13045 FOR_EACH_VEC_ELT (tree, deferred_mark_used_calls, i, decl)
13047 VEC_free (tree, gc, deferred_mark_used_calls);
13053 /* Create the FUNCTION_DECL for a function definition.
13054 DECLSPECS and DECLARATOR are the parts of the declaration;
13055 they describe the return type and the name of the function,
13056 but twisted together in a fashion that parallels the syntax of C.
13058 This function creates a binding context for the function body
13059 as well as setting up the FUNCTION_DECL in current_function_decl.
13061 Returns a FUNCTION_DECL on success.
13063 If the DECLARATOR is not suitable for a function (it defines a datum
13064 instead), we return 0, which tells yyparse to report a parse error.
13066 May return void_type_node indicating that this method is actually
13067 a friend. See grokfield for more details.
13069 Came here with a `.pushlevel' .
13071 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
13072 CHANGES TO CODE IN `grokfield'. */
13075 grokmethod (cp_decl_specifier_seq *declspecs,
13076 const cp_declarator *declarator, tree attrlist)
13078 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
13081 if (fndecl == error_mark_node)
13082 return error_mark_node;
13084 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
13086 error ("invalid member function declaration");
13087 return error_mark_node;
13091 cplus_decl_attributes (&fndecl, attrlist, 0);
13093 /* Pass friends other than inline friend functions back. */
13094 if (fndecl == void_type_node)
13097 if (DECL_IN_AGGR_P (fndecl))
13099 if (DECL_CONTEXT (fndecl)
13100 && TREE_CODE (DECL_CONTEXT (fndecl)) != NAMESPACE_DECL)
13101 error ("%qD is already defined in class %qT", fndecl,
13102 DECL_CONTEXT (fndecl));
13103 return error_mark_node;
13106 check_template_shadow (fndecl);
13108 DECL_DECLARED_INLINE_P (fndecl) = 1;
13109 DECL_NO_INLINE_WARNING_P (fndecl) = 1;
13111 /* We process method specializations in finish_struct_1. */
13112 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
13114 fndecl = push_template_decl (fndecl);
13115 if (fndecl == error_mark_node)
13119 if (! DECL_FRIEND_P (fndecl))
13121 if (DECL_CHAIN (fndecl))
13123 fndecl = copy_node (fndecl);
13124 TREE_CHAIN (fndecl) = NULL_TREE;
13128 cp_finish_decl (fndecl, NULL_TREE, false, NULL_TREE, 0);
13130 DECL_IN_AGGR_P (fndecl) = 1;
13135 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
13136 we can lay it out later, when and if its type becomes complete. */
13139 maybe_register_incomplete_var (tree var)
13141 gcc_assert (TREE_CODE (var) == VAR_DECL);
13143 /* Keep track of variables with incomplete types. */
13144 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
13145 && DECL_EXTERNAL (var))
13147 tree inner_type = TREE_TYPE (var);
13149 while (TREE_CODE (inner_type) == ARRAY_TYPE)
13150 inner_type = TREE_TYPE (inner_type);
13151 inner_type = TYPE_MAIN_VARIANT (inner_type);
13153 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
13154 /* RTTI TD entries are created while defining the type_info. */
13155 || (TYPE_LANG_SPECIFIC (inner_type)
13156 && TYPE_BEING_DEFINED (inner_type)))
13159 = VEC_safe_push (incomplete_var, gc, incomplete_vars, NULL);
13161 iv->incomplete_type = inner_type;
13166 /* Called when a class type (given by TYPE) is defined. If there are
13167 any existing VAR_DECLs whose type has been completed by this
13168 declaration, update them now. */
13171 complete_vars (tree type)
13174 incomplete_var *iv;
13176 for (ix = 0; VEC_iterate (incomplete_var, incomplete_vars, ix, iv); )
13178 if (same_type_p (type, iv->incomplete_type))
13180 tree var = iv->decl;
13181 tree type = TREE_TYPE (var);
13182 /* Complete the type of the variable. The VAR_DECL itself
13183 will be laid out in expand_expr. */
13184 complete_type (type);
13185 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
13186 /* Remove this entry from the list. */
13187 VEC_unordered_remove (incomplete_var, incomplete_vars, ix);
13193 /* Check for pending declarations which may have abstract type. */
13194 complete_type_check_abstract (type);
13197 /* If DECL is of a type which needs a cleanup, build and return an
13198 expression to perform that cleanup here. Return NULL_TREE if no
13199 cleanup need be done. */
13202 cxx_maybe_build_cleanup (tree decl)
13208 /* Assume no cleanup is required. */
13209 cleanup = NULL_TREE;
13211 if (error_operand_p (decl))
13214 /* Handle "__attribute__((cleanup))". We run the cleanup function
13215 before the destructor since the destructor is what actually
13216 terminates the lifetime of the object. */
13217 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
13224 /* Get the name specified by the user for the cleanup function. */
13225 id = TREE_VALUE (TREE_VALUE (attr));
13226 /* Look up the name to find the cleanup function to call. It is
13227 important to use lookup_name here because that is what is
13228 used in c-common.c:handle_cleanup_attribute when performing
13229 initial checks on the attribute. Note that those checks
13230 include ensuring that the function found is not an overloaded
13231 function, or an object with an overloaded call operator,
13232 etc.; we can rely on the fact that the function found is an
13233 ordinary FUNCTION_DECL. */
13234 fn = lookup_name (id);
13235 arg = build_address (decl);
13237 cleanup = cp_build_function_call_nary (fn, tf_warning_or_error,
13240 /* Handle ordinary C++ destructors. */
13241 type = TREE_TYPE (decl);
13242 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
13244 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
13245 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
13246 && CLASSTYPE_VBASECLASSES (type));
13250 if (TREE_CODE (type) == ARRAY_TYPE)
13253 addr = build_address (decl);
13255 /* Optimize for space over speed here. */
13256 if (!has_vbases || flag_expensive_optimizations)
13257 flags |= LOOKUP_NONVIRTUAL;
13259 call = build_delete (TREE_TYPE (addr), addr,
13260 sfk_complete_destructor, flags, 0);
13262 cleanup = build_compound_expr (input_location, cleanup, call);
13270 /* When a stmt has been parsed, this function is called. */
13277 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
13278 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
13279 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
13282 static_fn_type (tree memfntype)
13287 if (TYPE_PTRMEMFUNC_P (memfntype))
13288 memfntype = TYPE_PTRMEMFUNC_FN_TYPE (memfntype);
13289 if (POINTER_TYPE_P (memfntype)
13290 || TREE_CODE (memfntype) == FUNCTION_DECL)
13291 memfntype = TREE_TYPE (memfntype);
13292 if (TREE_CODE (memfntype) == FUNCTION_TYPE)
13294 gcc_assert (TREE_CODE (memfntype) == METHOD_TYPE);
13295 args = TYPE_ARG_TYPES (memfntype);
13296 fntype = build_function_type (TREE_TYPE (memfntype), TREE_CHAIN (args));
13297 fntype = apply_memfn_quals (fntype, type_memfn_quals (memfntype));
13298 fntype = (cp_build_type_attribute_variant
13299 (fntype, TYPE_ATTRIBUTES (memfntype)));
13300 fntype = (build_exception_variant
13301 (fntype, TYPE_RAISES_EXCEPTIONS (memfntype)));
13305 /* DECL was originally constructed as a non-static member function,
13306 but turned out to be static. Update it accordingly. */
13309 revert_static_member_fn (tree decl)
13311 TREE_TYPE (decl) = static_fn_type (decl);
13313 if (cp_type_quals (TREE_TYPE (decl)) != TYPE_UNQUALIFIED)
13314 error ("static member function %q#D declared with type qualifiers", decl);
13316 if (DECL_ARGUMENTS (decl))
13317 DECL_ARGUMENTS (decl) = DECL_CHAIN (DECL_ARGUMENTS (decl));
13318 DECL_STATIC_FUNCTION_P (decl) = 1;
13321 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
13322 one of the language-independent trees. */
13324 enum cp_tree_node_structure_enum
13325 cp_tree_node_structure (union lang_tree_node * t)
13327 switch (TREE_CODE (&t->generic))
13329 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
13330 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
13331 case OVERLOAD: return TS_CP_OVERLOAD;
13332 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
13333 case PTRMEM_CST: return TS_CP_PTRMEM;
13334 case BASELINK: return TS_CP_BASELINK;
13335 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
13336 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
13337 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
13338 case LAMBDA_EXPR: return TS_CP_LAMBDA_EXPR;
13339 case TEMPLATE_INFO: return TS_CP_TEMPLATE_INFO;
13340 default: return TS_CP_GENERIC;
13344 /* Build the void_list_node (void_type_node having been created). */
13346 build_void_list_node (void)
13348 tree t = build_tree_list (NULL_TREE, void_type_node);
13353 cp_missing_noreturn_ok_p (tree decl)
13355 /* A missing noreturn is ok for the `main' function. */
13356 return DECL_MAIN_P (decl);
13359 /* Return the COMDAT group into which DECL should be placed. */
13362 cxx_comdat_group (tree decl)
13366 /* Virtual tables, construction virtual tables, and virtual table
13367 tables all go in a single COMDAT group, named after the primary
13369 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
13370 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
13371 /* For all other DECLs, the COMDAT group is the mangled name of the
13372 declaration itself. */
13375 while (DECL_THUNK_P (decl))
13377 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
13378 into the same section as the target function. In that case
13379 we must return target's name. */
13380 tree target = THUNK_TARGET (decl);
13381 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
13382 && DECL_SECTION_NAME (target) != NULL
13383 && DECL_ONE_ONLY (target))
13388 name = DECL_ASSEMBLER_NAME (decl);
13394 #include "gt-cp-decl.h"