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_DELETED_FN (decl))
6098 maybe_explain_implicit_delete (decl);
6099 else if (DECL_INITIAL (decl) == error_mark_node)
6100 synthesize_method (decl);
6103 error ("function %q#D is initialized like a variable", decl);
6105 /* else no initialization required. */
6107 else if (DECL_EXTERNAL (decl)
6108 && ! (DECL_LANG_SPECIFIC (decl)
6109 && DECL_NOT_REALLY_EXTERN (decl)))
6112 DECL_INITIAL (decl) = init;
6114 /* A variable definition. */
6115 else if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
6116 /* Initialize the local variable. */
6117 initialize_local_var (decl, init);
6119 /* If a variable is defined, and then a subsequent
6120 definition with external linkage is encountered, we will
6121 get here twice for the same variable. We want to avoid
6122 calling expand_static_init more than once. For variables
6123 that are not static data members, we can call
6124 expand_static_init only when we actually process the
6125 initializer. It is not legal to redeclare a static data
6126 member, so this issue does not arise in that case. */
6127 else if (var_definition_p && TREE_STATIC (decl))
6128 expand_static_init (decl, init);
6131 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
6132 reference, insert it in the statement-tree now. */
6134 push_cleanup (decl, cleanup, false);
6137 processing_template_decl = saved_processing_template_decl;
6140 TREE_READONLY (decl) = 1;
6143 /* Returns a declaration for a VAR_DECL as if:
6145 extern "C" TYPE NAME;
6147 had been seen. Used to create compiler-generated global
6151 declare_global_var (tree name, tree type)
6155 push_to_top_level ();
6156 decl = build_decl (input_location, VAR_DECL, name, type);
6157 TREE_PUBLIC (decl) = 1;
6158 DECL_EXTERNAL (decl) = 1;
6159 DECL_ARTIFICIAL (decl) = 1;
6160 /* If the user has explicitly declared this variable (perhaps
6161 because the code we are compiling is part of a low-level runtime
6162 library), then it is possible that our declaration will be merged
6163 with theirs by pushdecl. */
6164 decl = pushdecl (decl);
6165 cp_finish_decl (decl, NULL_TREE, false, NULL_TREE, 0);
6166 pop_from_top_level ();
6171 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
6172 if "__cxa_atexit" is not being used) corresponding to the function
6173 to be called when the program exits. */
6176 get_atexit_fn_ptr_type (void)
6180 if (!atexit_fn_ptr_type_node)
6183 if (flag_use_cxa_atexit
6184 && !targetm.cxx.use_atexit_for_cxa_atexit ())
6185 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
6186 arg_type = ptr_type_node;
6188 /* The parameter to "atexit" is "void (*)(void)". */
6189 arg_type = NULL_TREE;
6191 fn_type = build_function_type_list (void_type_node,
6192 arg_type, NULL_TREE);
6193 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
6196 return atexit_fn_ptr_type_node;
6199 /* Returns a pointer to the `atexit' function. Note that if
6200 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
6201 `__cxa_atexit' function specified in the IA64 C++ ABI. */
6204 get_atexit_node (void)
6210 bool use_aeabi_atexit;
6215 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6217 /* The declaration for `__cxa_atexit' is:
6219 int __cxa_atexit (void (*)(void *), void *, void *)
6221 We build up the argument types and then the function type
6223 tree argtype0, argtype1, argtype2;
6225 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
6226 /* First, build the pointer-to-function type for the first
6228 fn_ptr_type = get_atexit_fn_ptr_type ();
6229 /* Then, build the rest of the argument types. */
6230 argtype2 = ptr_type_node;
6231 if (use_aeabi_atexit)
6233 argtype1 = fn_ptr_type;
6234 argtype0 = ptr_type_node;
6238 argtype1 = ptr_type_node;
6239 argtype0 = fn_ptr_type;
6241 /* And the final __cxa_atexit type. */
6242 fn_type = build_function_type_list (integer_type_node,
6243 argtype0, argtype1, argtype2,
6245 fn_ptr_type = build_pointer_type (fn_type);
6246 if (use_aeabi_atexit)
6247 name = "__aeabi_atexit";
6249 name = "__cxa_atexit";
6253 /* The declaration for `atexit' is:
6255 int atexit (void (*)());
6257 We build up the argument types and then the function type
6259 fn_ptr_type = get_atexit_fn_ptr_type ();
6260 /* Build the final atexit type. */
6261 fn_type = build_function_type_list (integer_type_node,
6262 fn_ptr_type, NULL_TREE);
6266 /* Now, build the function declaration. */
6267 push_lang_context (lang_name_c);
6268 atexit_fndecl = build_library_fn_ptr (name, fn_type);
6269 mark_used (atexit_fndecl);
6270 pop_lang_context ();
6271 atexit_node = decay_conversion (atexit_fndecl);
6276 /* Returns the __dso_handle VAR_DECL. */
6279 get_dso_handle_node (void)
6281 if (dso_handle_node)
6282 return dso_handle_node;
6284 /* Declare the variable. */
6285 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
6288 return dso_handle_node;
6291 /* Begin a new function with internal linkage whose job will be simply
6292 to destroy some particular variable. */
6294 static GTY(()) int start_cleanup_cnt;
6297 start_cleanup_fn (void)
6302 bool use_cxa_atexit = flag_use_cxa_atexit
6303 && !targetm.cxx.use_atexit_for_cxa_atexit ();
6305 push_to_top_level ();
6307 /* No need to mangle this. */
6308 push_lang_context (lang_name_c);
6310 /* Build the name of the function. */
6311 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
6312 /* Build the function declaration. */
6313 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
6314 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
6315 /* It's a function with internal linkage, generated by the
6317 TREE_PUBLIC (fndecl) = 0;
6318 DECL_ARTIFICIAL (fndecl) = 1;
6319 /* Make the function `inline' so that it is only emitted if it is
6320 actually needed. It is unlikely that it will be inlined, since
6321 it is only called via a function pointer, but we avoid unnecessary
6322 emissions this way. */
6323 DECL_DECLARED_INLINE_P (fndecl) = 1;
6324 DECL_INTERFACE_KNOWN (fndecl) = 1;
6325 /* Build the parameter. */
6330 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
6331 DECL_CONTEXT (parmdecl) = fndecl;
6332 TREE_USED (parmdecl) = 1;
6333 DECL_READ_P (parmdecl) = 1;
6334 DECL_ARGUMENTS (fndecl) = parmdecl;
6338 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
6340 pop_lang_context ();
6342 return current_function_decl;
6345 /* Finish the cleanup function begun by start_cleanup_fn. */
6348 end_cleanup_fn (void)
6350 expand_or_defer_fn (finish_function (0));
6352 pop_from_top_level ();
6355 /* Generate code to handle the destruction of DECL, an object with
6356 static storage duration. */
6359 register_dtor_fn (tree decl)
6366 tree arg0, arg1 = NULL_TREE, arg2 = NULL_TREE;
6368 type = TREE_TYPE (decl);
6369 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
6370 return void_zero_node;
6372 /* If we're using "__cxa_atexit" (or "__aeabi_atexit"), and DECL is
6373 a class object, we can just pass the destructor to
6374 "__cxa_atexit"; we don't have to build a temporary function to do
6376 use_dtor = (flag_use_cxa_atexit
6377 && !targetm.cxx.use_atexit_for_cxa_atexit ()
6378 && CLASS_TYPE_P (type));
6383 /* Find the destructor. */
6384 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
6385 gcc_assert (idx >= 0);
6386 cleanup = VEC_index (tree, CLASSTYPE_METHOD_VEC (type), idx);
6387 /* Make sure it is accessible. */
6388 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup);
6392 /* Call build_cleanup before we enter the anonymous function so
6393 that any access checks will be done relative to the current
6394 scope, rather than the scope of the anonymous function. */
6395 build_cleanup (decl);
6397 /* Now start the function. */
6398 cleanup = start_cleanup_fn ();
6400 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
6401 to the original function, rather than the anonymous one. That
6402 will make the back end think that nested functions are in use,
6403 which causes confusion. */
6404 push_deferring_access_checks (dk_no_check);
6405 fcall = build_cleanup (decl);
6406 pop_deferring_access_checks ();
6408 /* Create the body of the anonymous function. */
6409 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
6410 finish_expr_stmt (fcall);
6411 finish_compound_stmt (compound_stmt);
6415 /* Call atexit with the cleanup function. */
6416 mark_used (cleanup);
6417 cleanup = build_address (cleanup);
6418 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6424 /* We must convert CLEANUP to the type that "__cxa_atexit"
6426 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
6427 /* "__cxa_atexit" will pass the address of DECL to the
6428 cleanup function. */
6430 addr = build_address (decl);
6431 /* The declared type of the parameter to "__cxa_atexit" is
6432 "void *". For plain "T*", we could just let the
6433 machinery in cp_build_function_call convert it -- but if the
6434 type is "cv-qualified T *", then we need to convert it
6435 before passing it in, to avoid spurious errors. */
6436 addr = build_nop (ptr_type_node, addr);
6439 /* Since the cleanup functions we build ignore the address
6440 they're given, there's no reason to pass the actual address
6441 in, and, in general, it's cheaper to pass NULL than any
6443 addr = null_pointer_node;
6444 arg2 = cp_build_addr_expr (get_dso_handle_node (),
6445 tf_warning_or_error);
6446 if (targetm.cxx.use_aeabi_atexit ())
6459 return cp_build_function_call_nary (get_atexit_node (), tf_warning_or_error,
6460 arg0, arg1, arg2, NULL_TREE);
6463 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
6464 is its initializer. Generate code to handle the construction
6465 and destruction of DECL. */
6468 expand_static_init (tree decl, tree init)
6470 gcc_assert (TREE_CODE (decl) == VAR_DECL);
6471 gcc_assert (TREE_STATIC (decl));
6473 /* Some variables require no dynamic initialization. */
6475 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
6478 if (DECL_FUNCTION_SCOPE_P (decl))
6480 /* Emit code to perform this initialization but once. */
6481 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
6482 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
6483 tree guard, guard_addr;
6484 tree acquire_fn, release_fn, abort_fn;
6487 /* Emit code to perform this initialization but once. This code
6490 static <type> guard;
6491 if (!guard.first_byte) {
6492 if (__cxa_guard_acquire (&guard)) {
6495 // Do initialization.
6496 flag = true; __cxa_guard_release (&guard);
6497 // Register variable for destruction at end of program.
6499 if (!flag) __cxa_guard_abort (&guard);
6503 Note that the `flag' variable is only set to 1 *after* the
6504 initialization is complete. This ensures that an exception,
6505 thrown during the construction, will cause the variable to
6506 reinitialized when we pass through this code again, as per:
6510 If the initialization exits by throwing an exception, the
6511 initialization is not complete, so it will be tried again
6512 the next time control enters the declaration.
6514 This process should be thread-safe, too; multiple threads
6515 should not be able to initialize the variable more than
6518 /* Create the guard variable. */
6519 guard = get_guard (decl);
6521 /* This optimization isn't safe on targets with relaxed memory
6522 consistency. On such targets we force synchronization in
6523 __cxa_guard_acquire. */
6524 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6526 /* Begin the conditional initialization. */
6527 if_stmt = begin_if_stmt ();
6528 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
6529 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6532 if (flag_threadsafe_statics)
6534 guard_addr = build_address (guard);
6536 acquire_fn = get_identifier ("__cxa_guard_acquire");
6537 release_fn = get_identifier ("__cxa_guard_release");
6538 abort_fn = get_identifier ("__cxa_guard_abort");
6539 if (!get_global_value_if_present (acquire_fn, &acquire_fn))
6541 tree vfntype = build_function_type_list (void_type_node,
6542 TREE_TYPE (guard_addr),
6544 acquire_fn = push_library_fn
6545 (acquire_fn, build_function_type_list (integer_type_node,
6546 TREE_TYPE (guard_addr),
6549 release_fn = push_library_fn (release_fn, vfntype, NULL_TREE);
6550 abort_fn = push_library_fn (abort_fn, vfntype, NULL_TREE);
6554 release_fn = identifier_global_value (release_fn);
6555 abort_fn = identifier_global_value (abort_fn);
6558 inner_if_stmt = begin_if_stmt ();
6559 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
6562 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6563 begin = get_target_expr (boolean_false_node);
6564 flag = TARGET_EXPR_SLOT (begin);
6566 TARGET_EXPR_CLEANUP (begin)
6567 = build3 (COND_EXPR, void_type_node, flag,
6569 build_call_n (abort_fn, 1, guard_addr));
6570 CLEANUP_EH_ONLY (begin) = 1;
6572 /* Do the initialization itself. */
6573 init = add_stmt_to_compound (begin, init);
6574 init = add_stmt_to_compound
6575 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
6576 init = add_stmt_to_compound
6577 (init, build_call_n (release_fn, 1, guard_addr));
6580 init = add_stmt_to_compound (init, set_guard (guard));
6582 /* Use atexit to register a function for destroying this static
6584 init = add_stmt_to_compound (init, register_dtor_fn (decl));
6586 finish_expr_stmt (init);
6588 if (flag_threadsafe_statics)
6590 finish_compound_stmt (inner_then_clause);
6591 finish_then_clause (inner_if_stmt);
6592 finish_if_stmt (inner_if_stmt);
6595 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6597 finish_compound_stmt (then_clause);
6598 finish_then_clause (if_stmt);
6599 finish_if_stmt (if_stmt);
6603 static_aggregates = tree_cons (init, decl, static_aggregates);
6607 /* Make TYPE a complete type based on INITIAL_VALUE.
6608 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
6609 2 if there was no information (in which case assume 0 if DO_DEFAULT),
6610 3 if the initializer list is empty (in pedantic mode). */
6613 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
6616 tree type, elt_type;
6620 unsigned HOST_WIDE_INT i;
6623 /* An array of character type can be initialized from a
6624 brace-enclosed string constant.
6626 FIXME: this code is duplicated from reshape_init. Probably
6627 we should just call reshape_init here? */
6628 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
6629 && TREE_CODE (initial_value) == CONSTRUCTOR
6630 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
6632 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
6633 tree value = VEC_index (constructor_elt, v, 0)->value;
6635 if (TREE_CODE (value) == STRING_CST
6636 && VEC_length (constructor_elt, v) == 1)
6637 initial_value = value;
6640 /* If any of the elements are parameter packs, we can't actually
6641 complete this type now because the array size is dependent. */
6642 if (TREE_CODE (initial_value) == CONSTRUCTOR)
6644 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value),
6647 if (PACK_EXPANSION_P (value))
6653 failure = complete_array_type (ptype, initial_value, do_default);
6655 /* We can create the array before the element type is complete, which
6656 means that we didn't have these two bits set in the original type
6657 either. In completing the type, we are expected to propagate these
6658 bits. See also complete_type which does the same thing for arrays
6661 if (TYPE_DOMAIN (type))
6663 elt_type = TREE_TYPE (type);
6664 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
6665 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
6666 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
6672 /* Return zero if something is declared to be a member of type
6673 CTYPE when in the context of CUR_TYPE. STRING is the error
6674 message to print in that case. Otherwise, quietly return 1. */
6677 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
6679 if (ctype && ctype != cur_type)
6681 if (flags == DTOR_FLAG)
6682 error ("destructor for alien class %qT cannot be a member", ctype);
6684 error ("constructor for alien class %qT cannot be a member", ctype);
6690 /* Subroutine of `grokdeclarator'. */
6692 /* Generate errors possibly applicable for a given set of specifiers.
6693 This is for ARM $7.1.2. */
6696 bad_specifiers (tree object,
6697 enum bad_spec_place type,
6708 error ("%qD declared as a %<virtual%> variable", object);
6710 error ("%qD declared as an %<inline%> variable", object);
6712 error ("%<const%> and %<volatile%> function specifiers on "
6713 "%qD invalid in variable declaration", object);
6717 error ("%qD declared as a %<virtual%> parameter", object);
6719 error ("%qD declared as an %<inline%> parameter", object);
6721 error ("%<const%> and %<volatile%> function specifiers on "
6722 "%qD invalid in parameter declaration", object);
6726 error ("%qD declared as a %<virtual%> type", object);
6728 error ("%qD declared as an %<inline%> type", object);
6730 error ("%<const%> and %<volatile%> function specifiers on "
6731 "%qD invalid in type declaration", object);
6735 error ("%qD declared as a %<virtual%> field", object);
6737 error ("%qD declared as an %<inline%> field", object);
6739 error ("%<const%> and %<volatile%> function specifiers on "
6740 "%qD invalid in field declaration", object);
6746 error ("%q+D declared as a friend", object);
6748 && (TREE_CODE (object) == TYPE_DECL
6749 || (!TYPE_PTRFN_P (TREE_TYPE (object))
6750 && !TYPE_REFFN_P (TREE_TYPE (object))
6751 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
6752 error ("%q+D declared with an exception specification", object);
6755 /* DECL is a member function or static data member and is presently
6756 being defined. Check that the definition is taking place in a
6760 check_class_member_definition_namespace (tree decl)
6762 /* These checks only apply to member functions and static data
6764 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
6765 || TREE_CODE (decl) == VAR_DECL);
6766 /* We check for problems with specializations in pt.c in
6767 check_specialization_namespace, where we can issue better
6769 if (processing_specialization)
6771 /* There are no restrictions on the placement of
6772 explicit instantiations. */
6773 if (processing_explicit_instantiation)
6777 A member function definition that appears outside of the
6778 class definition shall appear in a namespace scope enclosing
6779 the class definition.
6783 The definition for a static data member shall appear in a
6784 namespace scope enclosing the member's class definition. */
6785 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
6786 permerror (input_location, "definition of %qD is not in namespace enclosing %qT",
6787 decl, DECL_CONTEXT (decl));
6790 /* Build a PARM_DECL for the "this" parameter. TYPE is the
6791 METHOD_TYPE for a non-static member function; QUALS are the
6792 cv-qualifiers that apply to the function. */
6795 build_this_parm (tree type, cp_cv_quals quals)
6800 cp_cv_quals this_quals;
6802 this_type = TREE_VALUE (TYPE_ARG_TYPES (type));
6803 /* The `this' parameter is implicitly `const'; it cannot be
6805 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
6806 qual_type = cp_build_qualified_type (this_type, this_quals);
6807 parm = build_artificial_parm (this_identifier, qual_type);
6808 cp_apply_type_quals_to_decl (this_quals, parm);
6812 /* CTYPE is class type, or null if non-class.
6813 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
6815 DECLARATOR is the function's name.
6816 PARMS is a chain of PARM_DECLs for the function.
6817 VIRTUALP is truthvalue of whether the function is virtual or not.
6818 FLAGS are to be passed through to `grokclassfn'.
6819 QUALS are qualifiers indicating whether the function is `const'
6821 RAISES is a list of exceptions that this function can raise.
6822 CHECK is 1 if we must find this method in CTYPE, 0 if we should
6823 not look, and -1 if we should not call `grokclassfn' at all.
6825 SFK is the kind of special function (if any) for the new function.
6827 Returns `NULL_TREE' if something goes wrong, after issuing
6828 applicable error messages. */
6831 grokfndecl (tree ctype,
6835 tree orig_declarator,
6837 enum overload_flags flags,
6844 special_function_kind sfk,
6849 location_t location)
6852 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
6856 type = build_exception_variant (type, raises);
6858 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
6860 /* If we have an explicit location, use it, otherwise use whatever
6861 build_lang_decl used (probably input_location). */
6862 if (location != UNKNOWN_LOCATION)
6863 DECL_SOURCE_LOCATION (decl) = location;
6865 if (TREE_CODE (type) == METHOD_TYPE)
6868 parm = build_this_parm (type, quals);
6869 DECL_CHAIN (parm) = parms;
6872 DECL_ARGUMENTS (decl) = parms;
6873 for (t = parms; t; t = DECL_CHAIN (t))
6874 DECL_CONTEXT (t) = decl;
6875 /* Propagate volatile out from type to decl. */
6876 if (TYPE_VOLATILE (type))
6877 TREE_THIS_VOLATILE (decl) = 1;
6879 /* Setup decl according to sfk. */
6882 case sfk_constructor:
6883 case sfk_copy_constructor:
6884 case sfk_move_constructor:
6885 DECL_CONSTRUCTOR_P (decl) = 1;
6887 case sfk_destructor:
6888 DECL_DESTRUCTOR_P (decl) = 1;
6894 /* If pointers to member functions use the least significant bit to
6895 indicate whether a function is virtual, ensure a pointer
6896 to this function will have that bit clear. */
6897 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
6898 && TREE_CODE (type) == METHOD_TYPE
6899 && DECL_ALIGN (decl) < 2 * BITS_PER_UNIT)
6900 DECL_ALIGN (decl) = 2 * BITS_PER_UNIT;
6903 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
6907 ("defining explicit specialization %qD in friend declaration",
6911 tree fns = TREE_OPERAND (orig_declarator, 0);
6912 tree args = TREE_OPERAND (orig_declarator, 1);
6914 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
6916 /* Something like `template <class T> friend void f<T>()'. */
6917 error ("invalid use of template-id %qD in declaration "
6918 "of primary template",
6924 /* A friend declaration of the form friend void f<>(). Record
6925 the information in the TEMPLATE_ID_EXPR. */
6926 SET_DECL_IMPLICIT_INSTANTIATION (decl);
6928 if (TREE_CODE (fns) == COMPONENT_REF)
6930 /* Due to bison parser ickiness, we will have already looked
6931 up an operator_name or PFUNCNAME within the current class
6932 (see template_id in parse.y). If the current class contains
6933 such a name, we'll get a COMPONENT_REF here. Undo that. */
6935 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
6936 == current_class_type);
6937 fns = TREE_OPERAND (fns, 1);
6939 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
6940 || TREE_CODE (fns) == OVERLOAD);
6941 DECL_TEMPLATE_INFO (decl) = build_template_info (fns, args);
6943 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
6944 if (TREE_PURPOSE (t)
6945 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
6947 error ("default arguments are not allowed in declaration "
6948 "of friend template specialization %qD",
6955 error ("%<inline%> is not allowed in declaration of friend "
6956 "template specialization %qD",
6963 /* If this decl has namespace scope, set that up. */
6965 set_decl_namespace (decl, in_namespace, friendp);
6967 DECL_CONTEXT (decl) = FROB_CONTEXT (current_decl_namespace ());
6969 /* `main' and builtins have implicit 'C' linkage. */
6970 if ((MAIN_NAME_P (declarator)
6971 || (IDENTIFIER_LENGTH (declarator) > 10
6972 && IDENTIFIER_POINTER (declarator)[0] == '_'
6973 && IDENTIFIER_POINTER (declarator)[1] == '_'
6974 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
6975 && current_lang_name == lang_name_cplusplus
6976 && ctype == NULL_TREE
6977 && DECL_FILE_SCOPE_P (decl))
6978 SET_DECL_LANGUAGE (decl, lang_c);
6980 /* Should probably propagate const out from type to decl I bet (mrs). */
6983 DECL_STATIC_FUNCTION_P (decl) = 1;
6984 DECL_CONTEXT (decl) = ctype;
6989 DECL_CONTEXT (decl) = ctype;
6991 check_class_member_definition_namespace (decl);
6994 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
6996 if (processing_template_decl)
6997 error ("cannot declare %<::main%> to be a template");
6999 error ("cannot declare %<::main%> to be inline");
7001 error ("cannot declare %<::main%> to be static");
7006 /* Members of anonymous types and local classes have no linkage; make
7007 them internal. If a typedef is made later, this will be changed. */
7008 if (ctype && (TYPE_ANONYMOUS_P (ctype)
7009 || decl_function_context (TYPE_MAIN_DECL (ctype))))
7012 if (publicp && cxx_dialect == cxx98)
7014 /* [basic.link]: A name with no linkage (notably, the name of a class
7015 or enumeration declared in a local scope) shall not be used to
7016 declare an entity with linkage.
7018 DR 757 relaxes this restriction for C++0x. */
7019 t = no_linkage_check (TREE_TYPE (decl),
7020 /*relaxed_p=*/false);
7023 if (TYPE_ANONYMOUS_P (t))
7025 if (DECL_EXTERN_C_P (decl))
7026 /* Allow this; it's pretty common in C. */;
7029 permerror (input_location, "anonymous type with no linkage "
7030 "used to declare function %q#D with linkage",
7032 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7033 permerror (input_location, "%q+#D does not refer to the unqualified "
7034 "type, so it is not used for linkage",
7039 permerror (input_location, "type %qT with no linkage used to "
7040 "declare function %q#D with linkage", t, decl);
7044 TREE_PUBLIC (decl) = publicp;
7047 DECL_INTERFACE_KNOWN (decl) = 1;
7048 DECL_NOT_REALLY_EXTERN (decl) = 1;
7051 /* If the declaration was declared inline, mark it as such. */
7053 DECL_DECLARED_INLINE_P (decl) = 1;
7055 DECL_DECLARED_CONSTEXPR_P (decl) = true;
7057 DECL_EXTERNAL (decl) = 1;
7058 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
7061 ? G_("static member function %qD cannot have cv-qualifier")
7062 : G_("non-member function %qD cannot have cv-qualifier"),
7064 quals = TYPE_UNQUALIFIED;
7067 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
7068 && !grok_op_properties (decl, /*complain=*/true))
7072 /* Make the init_value nonzero so pushdecl knows this is not
7073 tentative. error_mark_node is replaced later with the BLOCK. */
7074 DECL_INITIAL (decl) = error_mark_node;
7076 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
7077 TREE_NOTHROW (decl) = 1;
7079 /* Caller will do the rest of this. */
7083 if (ctype != NULL_TREE)
7084 grokclassfn (ctype, decl, flags);
7086 decl = check_explicit_specialization (orig_declarator, decl,
7089 4 * (friendp != 0));
7090 if (decl == error_mark_node)
7095 cplus_decl_attributes (&decl, *attrlist, 0);
7096 *attrlist = NULL_TREE;
7099 /* Check main's type after attributes have been applied. */
7100 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7102 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
7105 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
7107 error ("%<::main%> must return %<int%>");
7108 newtype = build_function_type (integer_type_node, oldtypeargs);
7109 TREE_TYPE (decl) = newtype;
7112 check_main_parameter_types (decl);
7115 if (ctype != NULL_TREE
7116 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
7119 tree old_decl = check_classfn (ctype, decl,
7120 (processing_template_decl
7121 > template_class_depth (ctype))
7122 ? current_template_parms
7125 if (old_decl == error_mark_node)
7133 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
7134 /* Because grokfndecl is always supposed to return a
7135 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
7136 here. We depend on our callers to figure out that its
7137 really a template that's being returned. */
7138 old_decl = DECL_TEMPLATE_RESULT (old_decl);
7140 if (DECL_STATIC_FUNCTION_P (old_decl)
7141 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
7142 /* Remove the `this' parm added by grokclassfn.
7143 XXX Isn't this done in start_function, too? */
7144 revert_static_member_fn (decl);
7145 if (DECL_ARTIFICIAL (old_decl))
7147 error ("definition of implicitly-declared %qD", old_decl);
7151 /* Since we've smashed OLD_DECL to its
7152 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
7153 if (TREE_CODE (decl) == TEMPLATE_DECL)
7154 decl = DECL_TEMPLATE_RESULT (decl);
7156 /* Attempt to merge the declarations. This can fail, in
7157 the case of some invalid specialization declarations. */
7158 pushed_scope = push_scope (ctype);
7159 ok = duplicate_decls (decl, old_decl, friendp);
7161 pop_scope (pushed_scope);
7164 error ("no %q#D member function declared in class %qT",
7172 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
7175 if (ctype == NULL_TREE || check)
7179 DECL_VIRTUAL_P (decl) = 1;
7184 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
7185 the linkage that DECL will receive in the object file. */
7188 set_linkage_for_static_data_member (tree decl)
7190 /* A static data member always has static storage duration and
7191 external linkage. Note that static data members are forbidden in
7192 local classes -- the only situation in which a class has
7193 non-external linkage. */
7194 TREE_PUBLIC (decl) = 1;
7195 TREE_STATIC (decl) = 1;
7196 /* For non-template classes, static data members are always put
7197 out in exactly those files where they are defined, just as
7198 with ordinary namespace-scope variables. */
7199 if (!processing_template_decl)
7200 DECL_INTERFACE_KNOWN (decl) = 1;
7203 /* Create a VAR_DECL named NAME with the indicated TYPE.
7205 If SCOPE is non-NULL, it is the class type or namespace containing
7206 the variable. If SCOPE is NULL, the variable should is created in
7207 the innermost enclosings scope. */
7210 grokvardecl (tree type,
7212 const cp_decl_specifier_seq *declspecs,
7218 tree explicit_scope;
7220 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
7222 /* Compute the scope in which to place the variable, but remember
7223 whether or not that scope was explicitly specified by the user. */
7224 explicit_scope = scope;
7227 /* An explicit "extern" specifier indicates a namespace-scope
7229 if (declspecs->storage_class == sc_extern)
7230 scope = current_decl_namespace ();
7231 else if (!at_function_scope_p ())
7232 scope = current_scope ();
7236 && (/* If the variable is a namespace-scope variable declared in a
7237 template, we need DECL_LANG_SPECIFIC. */
7238 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
7239 /* Similarly for namespace-scope variables with language linkage
7241 || (TREE_CODE (scope) == NAMESPACE_DECL
7242 && current_lang_name != lang_name_cplusplus)
7243 /* Similarly for static data members. */
7245 decl = build_lang_decl (VAR_DECL, name, type);
7247 decl = build_decl (input_location, VAR_DECL, name, type);
7249 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
7250 set_decl_namespace (decl, explicit_scope, 0);
7252 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
7254 if (declspecs->storage_class == sc_extern)
7256 DECL_THIS_EXTERN (decl) = 1;
7257 DECL_EXTERNAL (decl) = !initialized;
7260 if (DECL_CLASS_SCOPE_P (decl))
7262 set_linkage_for_static_data_member (decl);
7263 /* This function is only called with out-of-class definitions. */
7264 DECL_EXTERNAL (decl) = 0;
7265 check_class_member_definition_namespace (decl);
7267 /* At top level, either `static' or no s.c. makes a definition
7268 (perhaps tentative), and absence of `static' makes it public. */
7269 else if (toplevel_bindings_p ())
7271 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
7272 && (DECL_THIS_EXTERN (decl) || ! constp));
7273 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
7275 /* Not at top level, only `static' makes a static definition. */
7278 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
7279 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
7282 if (declspecs->specs[(int)ds_thread])
7283 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
7285 /* If the type of the decl has no linkage, make sure that we'll
7286 notice that in mark_used. */
7287 if (cxx_dialect > cxx98
7288 && decl_linkage (decl) != lk_none
7289 && DECL_LANG_SPECIFIC (decl) == NULL
7290 && !DECL_EXTERN_C_P (decl)
7291 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
7292 retrofit_lang_decl (decl);
7294 if (TREE_PUBLIC (decl))
7296 /* [basic.link]: A name with no linkage (notably, the name of a class
7297 or enumeration declared in a local scope) shall not be used to
7298 declare an entity with linkage.
7300 DR 757 relaxes this restriction for C++0x. */
7301 tree t = (cxx_dialect > cxx98 ? NULL_TREE
7302 : no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false));
7305 if (TYPE_ANONYMOUS_P (t))
7307 if (DECL_EXTERN_C_P (decl))
7308 /* Allow this; it's pretty common in C. */
7312 /* DRs 132, 319 and 389 seem to indicate types with
7313 no linkage can only be used to declare extern "C"
7314 entities. Since it's not always an error in the
7315 ISO C++ 90 Standard, we only issue a warning. */
7316 warning (0, "anonymous type with no linkage used to declare "
7317 "variable %q#D with linkage", decl);
7318 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7319 warning (0, "%q+#D does not refer to the unqualified "
7320 "type, so it is not used for linkage",
7325 warning (0, "type %qT with no linkage used to declare variable "
7326 "%q#D with linkage", t, decl);
7330 DECL_INTERFACE_KNOWN (decl) = 1;
7335 /* Create and return a canonical pointer to member function type, for
7336 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
7339 build_ptrmemfunc_type (tree type)
7343 tree unqualified_variant = NULL_TREE;
7345 if (type == error_mark_node)
7348 /* If a canonical type already exists for this type, use it. We use
7349 this method instead of type_hash_canon, because it only does a
7350 simple equality check on the list of field members. */
7352 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
7355 /* Make sure that we always have the unqualified pointer-to-member
7357 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7359 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
7361 t = make_class_type (RECORD_TYPE);
7362 xref_basetypes (t, NULL_TREE);
7364 /* Let the front end know this is a pointer to member function... */
7365 TYPE_PTRMEMFUNC_FLAG (t) = 1;
7366 /* ... and not really a class type. */
7367 SET_CLASS_TYPE_P (t, 0);
7369 field = build_decl (input_location, FIELD_DECL, pfn_identifier, type);
7372 field = build_decl (input_location, FIELD_DECL, delta_identifier,
7374 DECL_CHAIN (field) = fields;
7377 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
7379 /* Zap out the name so that the back end will give us the debugging
7380 information for this anonymous RECORD_TYPE. */
7381 TYPE_NAME (t) = NULL_TREE;
7383 /* If this is not the unqualified form of this pointer-to-member
7384 type, set the TYPE_MAIN_VARIANT for this type to be the
7385 unqualified type. Since they are actually RECORD_TYPEs that are
7386 not variants of each other, we must do this manually.
7387 As we just built a new type there is no need to do yet another copy. */
7388 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7390 int type_quals = cp_type_quals (type);
7391 TYPE_READONLY (t) = (type_quals & TYPE_QUAL_CONST) != 0;
7392 TYPE_VOLATILE (t) = (type_quals & TYPE_QUAL_VOLATILE) != 0;
7393 TYPE_RESTRICT (t) = (type_quals & TYPE_QUAL_RESTRICT) != 0;
7394 TYPE_MAIN_VARIANT (t) = unqualified_variant;
7395 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
7396 TYPE_NEXT_VARIANT (unqualified_variant) = t;
7397 TREE_TYPE (TYPE_BINFO (t)) = t;
7400 /* Cache this pointer-to-member type so that we can find it again
7402 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
7404 if (TYPE_STRUCTURAL_EQUALITY_P (type))
7405 SET_TYPE_STRUCTURAL_EQUALITY (t);
7406 else if (TYPE_CANONICAL (type) != type)
7407 TYPE_CANONICAL (t) = build_ptrmemfunc_type (TYPE_CANONICAL (type));
7412 /* Create and return a pointer to data member type. */
7415 build_ptrmem_type (tree class_type, tree member_type)
7417 if (TREE_CODE (member_type) == METHOD_TYPE)
7419 cp_cv_quals quals = type_memfn_quals (member_type);
7420 member_type = build_memfn_type (member_type, class_type, quals);
7421 return build_ptrmemfunc_type (build_pointer_type (member_type));
7425 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
7426 return build_offset_type (class_type, member_type);
7430 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
7431 Check to see that the definition is valid. Issue appropriate error
7432 messages. Return 1 if the definition is particularly bad, or 0
7436 check_static_variable_definition (tree decl, tree type)
7438 /* If DECL is declared constexpr, we'll do the appropriate checks
7439 in check_initializer. */
7440 if (DECL_P (decl) && DECL_DECLARED_CONSTEXPR_P (decl))
7442 else if (cxx_dialect >= cxx0x && !INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7444 if (literal_type_p (type))
7445 error ("%<constexpr%> needed for in-class initialization of static "
7446 "data member %q#D of non-integral type", decl);
7448 error ("in-class initialization of static data member %q#D of "
7449 "non-literal type", decl);
7453 /* Motion 10 at San Diego: If a static const integral data member is
7454 initialized with an integral constant expression, the initializer
7455 may appear either in the declaration (within the class), or in
7456 the definition, but not both. If it appears in the class, the
7457 member is a member constant. The file-scope definition is always
7459 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
7461 error ("invalid in-class initialization of static data member "
7462 "of non-integral type %qT",
7466 else if (!CP_TYPE_CONST_P (type))
7467 error ("ISO C++ forbids in-class initialization of non-const "
7468 "static member %qD",
7470 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7471 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids initialization of member constant "
7472 "%qD of non-integral type %qT", decl, type);
7477 /* Given the SIZE (i.e., number of elements) in an array, compute an
7478 appropriate index type for the array. If non-NULL, NAME is the
7479 name of the thing being declared. */
7482 compute_array_index_type (tree name, tree size, tsubst_flags_t complain)
7487 tree abi_1_itype = NULL_TREE;
7489 if (error_operand_p (size))
7490 return error_mark_node;
7492 type = TREE_TYPE (size);
7493 /* type_dependent_expression_p? */
7494 if (!dependent_type_p (type))
7496 mark_rvalue_use (size);
7498 if (cxx_dialect < cxx0x && TREE_CODE (size) == NOP_EXPR
7499 && TREE_SIDE_EFFECTS (size))
7500 /* In C++98, we mark a non-constant array bound with a magic
7501 NOP_EXPR with TREE_SIDE_EFFECTS; don't fold in that case. */;
7504 size = fold_non_dependent_expr (size);
7506 if (CLASS_TYPE_P (type)
7507 && CLASSTYPE_LITERAL_P (type))
7509 size = build_expr_type_conversion (WANT_INT, size, true);
7510 if (size == error_mark_node)
7511 return error_mark_node;
7512 type = TREE_TYPE (size);
7515 size = maybe_constant_value (size);
7518 if (error_operand_p (size))
7519 return error_mark_node;
7521 /* The array bound must be an integer type. */
7522 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
7524 if (!(complain & tf_error))
7525 return error_mark_node;
7527 error ("size of array %qD has non-integral type %qT", name, type);
7529 error ("size of array has non-integral type %qT", type);
7530 size = integer_one_node;
7531 type = TREE_TYPE (size);
7535 /* A type is dependent if it is...an array type constructed from any
7536 dependent type or whose size is specified by a constant expression
7537 that is value-dependent. */
7538 /* We can only call value_dependent_expression_p on integral constant
7539 expressions; treat non-constant expressions as dependent, too. */
7540 if (processing_template_decl
7541 && (dependent_type_p (type)
7542 || !TREE_CONSTANT (size) || value_dependent_expression_p (size)))
7544 /* We cannot do any checking for a SIZE that isn't known to be
7545 constant. Just build the index type and mark that it requires
7546 structural equality checks. */
7547 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7548 size, integer_one_node));
7549 TYPE_DEPENDENT_P (itype) = 1;
7550 TYPE_DEPENDENT_P_VALID (itype) = 1;
7551 SET_TYPE_STRUCTURAL_EQUALITY (itype);
7555 if (!abi_version_at_least (2) && processing_template_decl)
7556 /* For abi-1, we handled all instances in templates the same way,
7557 even when they were non-dependent. This affects the manglings
7558 produced. So, we do the normal checking for non-dependent
7559 sizes, but at the end we'll return the same type that abi-1
7560 would have, but with TYPE_CANONICAL set to the "right"
7561 value that the current ABI would provide. */
7562 abi_1_itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7563 osize, integer_one_node));
7565 /* Normally, the array-bound will be a constant. */
7566 if (TREE_CODE (size) == INTEGER_CST)
7568 /* Check to see if the array bound overflowed. Make that an
7569 error, no matter how generous we're being. */
7570 constant_expression_error (size);
7572 /* An array must have a positive number of elements. */
7573 if (INT_CST_LT (size, integer_zero_node))
7575 if (!(complain & tf_error))
7576 return error_mark_node;
7578 error ("size of array %qD is negative", name);
7580 error ("size of array is negative");
7581 size = integer_one_node;
7583 /* As an extension we allow zero-sized arrays. */
7584 else if (integer_zerop (size))
7586 if (!(complain & tf_error))
7587 /* We must fail if performing argument deduction (as
7588 indicated by the state of complain), so that
7589 another substitution can be found. */
7590 return error_mark_node;
7591 else if (in_system_header)
7592 /* Allow them in system headers because glibc uses them. */;
7594 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array %qD", name);
7596 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array");
7599 else if (TREE_CONSTANT (size)
7600 /* We don't allow VLAs at non-function scopes, or during
7601 tentative template substitution. */
7602 || !at_function_scope_p () || !(complain & tf_error))
7604 if (!(complain & tf_error))
7605 return error_mark_node;
7606 /* `(int) &fn' is not a valid array bound. */
7608 error ("size of array %qD is not an integral constant-expression",
7611 error ("size of array is not an integral constant-expression");
7612 size = integer_one_node;
7614 else if (pedantic && warn_vla != 0)
7617 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array %qD", name);
7619 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array");
7621 else if (warn_vla > 0)
7625 "variable length array %qD is used", name);
7628 "variable length array is used");
7631 if (processing_template_decl && !TREE_CONSTANT (size))
7632 /* A variable sized array. */
7633 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
7636 HOST_WIDE_INT saved_processing_template_decl;
7638 /* Compute the index of the largest element in the array. It is
7639 one less than the number of elements in the array. We save
7640 and restore PROCESSING_TEMPLATE_DECL so that computations in
7641 cp_build_binary_op will be appropriately folded. */
7642 saved_processing_template_decl = processing_template_decl;
7643 processing_template_decl = 0;
7644 itype = cp_build_binary_op (input_location,
7646 cp_convert (ssizetype, size),
7647 cp_convert (ssizetype, integer_one_node),
7648 tf_warning_or_error);
7649 itype = fold (itype);
7650 processing_template_decl = saved_processing_template_decl;
7652 if (!TREE_CONSTANT (itype))
7653 /* A variable sized array. */
7654 itype = variable_size (itype);
7655 /* Make sure that there was no overflow when creating to a signed
7656 index type. (For example, on a 32-bit machine, an array with
7657 size 2^32 - 1 is too big.) */
7658 else if (TREE_CODE (itype) == INTEGER_CST
7659 && TREE_OVERFLOW (itype))
7661 if (!(complain & tf_error))
7662 return error_mark_node;
7663 error ("overflow in array dimension");
7664 TREE_OVERFLOW (itype) = 0;
7668 /* Create and return the appropriate index type. */
7671 tree t = build_index_type (itype);
7672 TYPE_CANONICAL (abi_1_itype) = TYPE_CANONICAL (t);
7673 itype = abi_1_itype;
7676 itype = build_index_type (itype);
7678 /* If the index type were dependent, we would have returned early, so
7679 remember that it isn't. */
7680 TYPE_DEPENDENT_P (itype) = 0;
7681 TYPE_DEPENDENT_P_VALID (itype) = 1;
7685 /* Returns the scope (if any) in which the entity declared by
7686 DECLARATOR will be located. If the entity was declared with an
7687 unqualified name, NULL_TREE is returned. */
7690 get_scope_of_declarator (const cp_declarator *declarator)
7692 while (declarator && declarator->kind != cdk_id)
7693 declarator = declarator->declarator;
7695 /* If the declarator-id is a SCOPE_REF, the scope in which the
7696 declaration occurs is the first operand. */
7698 && declarator->u.id.qualifying_scope)
7699 return declarator->u.id.qualifying_scope;
7701 /* Otherwise, the declarator is not a qualified name; the entity will
7702 be declared in the current scope. */
7706 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
7707 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
7711 create_array_type_for_decl (tree name, tree type, tree size)
7713 tree itype = NULL_TREE;
7715 /* If things have already gone awry, bail now. */
7716 if (type == error_mark_node || size == error_mark_node)
7717 return error_mark_node;
7719 /* If there are some types which cannot be array elements,
7720 issue an error-message and return. */
7721 switch (TREE_CODE (type))
7725 error ("declaration of %qD as array of void", name);
7727 error ("creating array of void");
7728 return error_mark_node;
7732 error ("declaration of %qD as array of functions", name);
7734 error ("creating array of functions");
7735 return error_mark_node;
7737 case REFERENCE_TYPE:
7739 error ("declaration of %qD as array of references", name);
7741 error ("creating array of references");
7742 return error_mark_node;
7746 error ("declaration of %qD as array of function members", name);
7748 error ("creating array of function members");
7749 return error_mark_node;
7757 The constant expressions that specify the bounds of the arrays
7758 can be omitted only for the first member of the sequence. */
7759 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
7762 error ("declaration of %qD as multidimensional array must "
7763 "have bounds for all dimensions except the first",
7766 error ("multidimensional array must have bounds for all "
7767 "dimensions except the first");
7769 return error_mark_node;
7772 /* Figure out the index type for the array. */
7774 itype = compute_array_index_type (name, size, tf_warning_or_error);
7777 T is called the array element type; this type shall not be [...] an
7778 abstract class type. */
7779 abstract_virtuals_error (name, type);
7781 return build_cplus_array_type (type, itype);
7784 /* Check that it's OK to declare a function with the indicated TYPE.
7785 SFK indicates the kind of special function (if any) that this
7786 function is. OPTYPE is the type given in a conversion operator
7787 declaration, or the class type for a constructor/destructor.
7788 Returns the actual return type of the function; that
7789 may be different than TYPE if an error occurs, or for certain
7790 special functions. */
7793 check_special_function_return_type (special_function_kind sfk,
7799 case sfk_constructor:
7801 error ("return type specification for constructor invalid");
7803 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7804 type = build_pointer_type (optype);
7806 type = void_type_node;
7809 case sfk_destructor:
7811 error ("return type specification for destructor invalid");
7812 /* We can't use the proper return type here because we run into
7813 problems with ambiguous bases and covariant returns.
7814 Java classes are left unchanged because (void *) isn't a valid
7815 Java type, and we don't want to change the Java ABI. */
7816 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7817 type = build_pointer_type (void_type_node);
7819 type = void_type_node;
7822 case sfk_conversion:
7824 error ("return type specified for %<operator %T%>", optype);
7835 /* A variable or data member (whose unqualified name is IDENTIFIER)
7836 has been declared with the indicated TYPE. If the TYPE is not
7837 acceptable, issue an error message and return a type to use for
7838 error-recovery purposes. */
7841 check_var_type (tree identifier, tree type)
7843 if (VOID_TYPE_P (type))
7846 error ("unnamed variable or field declared void");
7847 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
7849 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
7850 error ("variable or field %qE declared void", identifier);
7853 error ("variable or field declared void");
7854 type = error_mark_node;
7860 /* Given declspecs and a declarator (abstract or otherwise), determine
7861 the name and type of the object declared and construct a DECL node
7864 DECLSPECS points to the representation of declaration-specifier
7865 sequence that precedes declarator.
7867 DECL_CONTEXT says which syntactic context this declaration is in:
7868 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
7869 FUNCDEF for a function definition. Like NORMAL but a few different
7870 error messages in each case. Return value may be zero meaning
7871 this definition is too screwy to try to parse.
7872 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
7873 handle member functions (which have FIELD context).
7874 Return value may be zero meaning this definition is too screwy to
7876 PARM for a parameter declaration (either within a function prototype
7877 or before a function body). Make a PARM_DECL, or return void_type_node.
7878 TPARM for a template parameter declaration.
7879 CATCHPARM for a parameter declaration before a catch clause.
7880 TYPENAME if for a typename (in a cast or sizeof).
7881 Don't make a DECL node; just return the ..._TYPE node.
7882 FIELD for a struct or union field; make a FIELD_DECL.
7883 BITFIELD for a field with specified width.
7885 INITIALIZED is as for start_decl.
7887 ATTRLIST is a pointer to the list of attributes, which may be NULL
7888 if there are none; *ATTRLIST may be modified if attributes from inside
7889 the declarator should be applied to the declaration.
7891 When this function is called, scoping variables (such as
7892 CURRENT_CLASS_TYPE) should reflect the scope in which the
7893 declaration occurs, not the scope in which the new declaration will
7894 be placed. For example, on:
7898 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
7901 Returns a DECL (if a declarator is present), a TYPE (if there is no
7902 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
7906 grokdeclarator (const cp_declarator *declarator,
7907 const cp_decl_specifier_seq *declspecs,
7908 enum decl_context decl_context,
7912 tree type = NULL_TREE;
7914 int explicit_int128 = 0;
7915 int virtualp, explicitp, friendp, inlinep, staticp;
7916 int explicit_int = 0;
7917 int explicit_char = 0;
7918 int defaulted_int = 0;
7919 tree dependent_name = NULL_TREE;
7921 tree typedef_decl = NULL_TREE;
7922 const char *name = NULL;
7923 tree typedef_type = NULL_TREE;
7924 /* True if this declarator is a function definition. */
7925 bool funcdef_flag = false;
7926 cp_declarator_kind innermost_code = cdk_error;
7929 /* See the code below that used this. */
7930 tree decl_attr = NULL_TREE;
7933 /* Keep track of what sort of function is being processed
7934 so that we can warn about default return values, or explicit
7935 return values which do not match prescribed defaults. */
7936 special_function_kind sfk = sfk_none;
7938 tree dname = NULL_TREE;
7939 tree ctor_return_type = NULL_TREE;
7940 enum overload_flags flags = NO_SPECIAL;
7941 /* cv-qualifiers that apply to the declarator, for a declaration of
7942 a member function. */
7943 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
7944 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
7946 tree raises = NULL_TREE;
7947 int template_count = 0;
7948 tree returned_attrs = NULL_TREE;
7949 tree parms = NULL_TREE;
7950 const cp_declarator *id_declarator;
7951 /* The unqualified name of the declarator; either an
7952 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
7953 tree unqualified_id;
7954 /* The class type, if any, in which this entity is located,
7955 or NULL_TREE if none. Note that this value may be different from
7956 the current class type; for example if an attempt is made to declare
7957 "A::f" inside "B", this value will be "A". */
7958 tree ctype = current_class_type;
7959 /* The NAMESPACE_DECL for the namespace in which this entity is
7960 located. If an unqualified name is used to declare the entity,
7961 this value will be NULL_TREE, even if the entity is located at
7963 tree in_namespace = NULL_TREE;
7964 cp_storage_class storage_class;
7965 bool unsigned_p, signed_p, short_p, long_p, thread_p;
7966 bool type_was_error_mark_node = false;
7967 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
7968 bool template_type_arg = false;
7969 bool template_parm_flag = false;
7970 bool constexpr_p = declspecs->specs[(int) ds_constexpr];
7973 signed_p = declspecs->specs[(int)ds_signed];
7974 unsigned_p = declspecs->specs[(int)ds_unsigned];
7975 short_p = declspecs->specs[(int)ds_short];
7976 long_p = declspecs->specs[(int)ds_long];
7977 longlong = declspecs->specs[(int)ds_long] >= 2;
7978 explicit_int128 = declspecs->explicit_int128_p;
7979 thread_p = declspecs->specs[(int)ds_thread];
7981 if (decl_context == FUNCDEF)
7982 funcdef_flag = true, decl_context = NORMAL;
7983 else if (decl_context == MEMFUNCDEF)
7984 funcdef_flag = true, decl_context = FIELD;
7985 else if (decl_context == BITFIELD)
7986 bitfield = 1, decl_context = FIELD;
7987 else if (decl_context == TEMPLATE_TYPE_ARG)
7988 template_type_arg = true, decl_context = TYPENAME;
7989 else if (decl_context == TPARM)
7990 template_parm_flag = true, decl_context = PARM;
7992 if (initialized > 1)
7993 funcdef_flag = true;
7995 /* Look inside a declarator for the name being declared
7996 and get it as a string, for an error message. */
7997 for (id_declarator = declarator;
7999 id_declarator = id_declarator->declarator)
8001 if (id_declarator->kind != cdk_id)
8002 innermost_code = id_declarator->kind;
8004 switch (id_declarator->kind)
8007 if (id_declarator->declarator
8008 && id_declarator->declarator->kind == cdk_id)
8010 sfk = id_declarator->declarator->u.id.sfk;
8011 if (sfk == sfk_destructor)
8018 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
8019 tree decl = id_declarator->u.id.unqualified_name;
8022 if (qualifying_scope)
8024 if (at_function_scope_p ())
8028 A declarator-id shall not be qualified except
8031 None of the cases are permitted in block
8033 if (qualifying_scope == global_namespace)
8034 error ("invalid use of qualified-name %<::%D%>",
8036 else if (TYPE_P (qualifying_scope))
8037 error ("invalid use of qualified-name %<%T::%D%>",
8038 qualifying_scope, decl);
8040 error ("invalid use of qualified-name %<%D::%D%>",
8041 qualifying_scope, decl);
8042 return error_mark_node;
8044 else if (TYPE_P (qualifying_scope))
8046 ctype = qualifying_scope;
8047 if (innermost_code != cdk_function
8048 && current_class_type
8049 && !UNIQUELY_DERIVED_FROM_P (ctype,
8050 current_class_type))
8052 error ("type %qT is not derived from type %qT",
8053 ctype, current_class_type);
8054 return error_mark_node;
8057 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
8058 in_namespace = qualifying_scope;
8060 switch (TREE_CODE (decl))
8066 if (innermost_code != cdk_function)
8068 error ("declaration of %qD as non-function", decl);
8069 return error_mark_node;
8071 else if (!qualifying_scope
8072 && !(current_class_type && at_class_scope_p ()))
8074 error ("declaration of %qD as non-member", decl);
8075 return error_mark_node;
8078 type = TREE_OPERAND (decl, 0);
8080 type = constructor_name (type);
8081 name = identifier_to_locale (IDENTIFIER_POINTER (type));
8086 case TEMPLATE_ID_EXPR:
8088 tree fns = TREE_OPERAND (decl, 0);
8091 if (TREE_CODE (dname) != IDENTIFIER_NODE)
8093 gcc_assert (is_overloaded_fn (dname));
8094 dname = DECL_NAME (get_first_fn (dname));
8099 case IDENTIFIER_NODE:
8100 if (TREE_CODE (decl) == IDENTIFIER_NODE)
8103 if (C_IS_RESERVED_WORD (dname))
8105 error ("declarator-id missing; using reserved word %qD",
8107 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8109 else if (!IDENTIFIER_TYPENAME_P (dname))
8110 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8113 gcc_assert (flags == NO_SPECIAL);
8114 flags = TYPENAME_FLAG;
8115 ctor_return_type = TREE_TYPE (dname);
8116 sfk = sfk_conversion;
8117 if (is_typename_at_global_scope (dname))
8118 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8120 name = "<invalid operator>";
8137 return error_mark_node;
8142 if (id_declarator->kind == cdk_id)
8148 The declarator in a function-definition shall have the form
8149 D1 ( parameter-declaration-clause) ... */
8150 if (funcdef_flag && innermost_code != cdk_function)
8152 error ("function definition does not declare parameters");
8153 return error_mark_node;
8156 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
8157 && innermost_code != cdk_function
8158 && ! (ctype && !declspecs->any_specifiers_p))
8160 error ("declaration of %qD as non-function", dname);
8161 return error_mark_node;
8164 /* Anything declared one level down from the top level
8165 must be one of the parameters of a function
8166 (because the body is at least two levels down). */
8168 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
8169 by not allowing C++ class definitions to specify their parameters
8170 with xdecls (must be spec.d in the parmlist).
8172 Since we now wait to push a class scope until we are sure that
8173 we are in a legitimate method context, we must set oldcname
8174 explicitly (since current_class_name is not yet alive).
8176 We also want to avoid calling this a PARM if it is in a namespace. */
8178 if (decl_context == NORMAL && !toplevel_bindings_p ())
8180 struct cp_binding_level *b = current_binding_level;
8181 current_binding_level = b->level_chain;
8182 if (current_binding_level != 0 && toplevel_bindings_p ())
8183 decl_context = PARM;
8184 current_binding_level = b;
8188 name = decl_context == PARM ? "parameter" : "type name";
8190 if (constexpr_p && declspecs->specs[(int)ds_typedef])
8192 error ("%<constexpr%> cannot appear in a typedef declaration");
8193 return error_mark_node;
8196 /* If there were multiple types specified in the decl-specifier-seq,
8197 issue an error message. */
8198 if (declspecs->multiple_types_p)
8200 error ("two or more data types in declaration of %qs", name);
8201 return error_mark_node;
8204 if (declspecs->conflicting_specifiers_p)
8206 error ("conflicting specifiers in declaration of %qs", name);
8207 return error_mark_node;
8210 /* Extract the basic type from the decl-specifier-seq. */
8211 type = declspecs->type;
8212 if (type == error_mark_node)
8215 type_was_error_mark_node = true;
8217 /* If the entire declaration is itself tagged as deprecated then
8218 suppress reports of deprecated items. */
8219 if (type && TREE_DEPRECATED (type)
8220 && deprecated_state != DEPRECATED_SUPPRESS)
8221 warn_deprecated_use (type, NULL_TREE);
8222 if (type && TREE_CODE (type) == TYPE_DECL)
8224 typedef_decl = type;
8225 type = TREE_TYPE (typedef_decl);
8226 if (TREE_DEPRECATED (type)
8227 && DECL_ARTIFICIAL (typedef_decl)
8228 && deprecated_state != DEPRECATED_SUPPRESS)
8229 warn_deprecated_use (type, NULL_TREE);
8231 /* No type at all: default to `int', and set DEFAULTED_INT
8232 because it was not a user-defined typedef. */
8233 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
8235 /* These imply 'int'. */
8236 type = integer_type_node;
8240 explicit_int = declspecs->explicit_int_p;
8241 explicit_char = declspecs->explicit_char_p;
8244 /* See the code below that used this. */
8246 decl_attr = DECL_ATTRIBUTES (typedef_decl);
8248 typedef_type = type;
8251 if (sfk != sfk_conversion)
8252 ctor_return_type = ctype;
8254 if (sfk != sfk_none)
8255 type = check_special_function_return_type (sfk, type,
8257 else if (type == NULL_TREE)
8263 /* We handle `main' specially here, because 'main () { }' is so
8264 common. With no options, it is allowed. With -Wreturn-type,
8265 it is a warning. It is only an error with -pedantic-errors. */
8266 is_main = (funcdef_flag
8267 && dname && TREE_CODE (dname) == IDENTIFIER_NODE
8268 && MAIN_NAME_P (dname)
8269 && ctype == NULL_TREE
8270 && in_namespace == NULL_TREE
8271 && current_namespace == global_namespace);
8273 if (type_was_error_mark_node)
8274 /* We've already issued an error, don't complain more. */;
8275 else if (in_system_header || flag_ms_extensions)
8276 /* Allow it, sigh. */;
8278 permerror (input_location, "ISO C++ forbids declaration of %qs with no type", name);
8280 pedwarn (input_location, OPT_pedantic,
8281 "ISO C++ forbids declaration of %qs with no type", name);
8283 warning (OPT_Wreturn_type,
8284 "ISO C++ forbids declaration of %qs with no type", name);
8286 type = integer_type_node;
8291 /* Now process the modifiers that were specified
8292 and check for invalid combinations. */
8294 /* Long double is a special combination. */
8295 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
8298 type = cp_build_qualified_type (long_double_type_node,
8299 cp_type_quals (type));
8302 /* Check all other uses of type modifiers. */
8304 if (unsigned_p || signed_p || long_p || short_p)
8308 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
8309 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8310 else if (signed_p && unsigned_p)
8311 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
8312 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
8313 error ("%<long long%> invalid for %qs", name);
8314 else if (explicit_int128 && TREE_CODE (type) != INTEGER_TYPE)
8315 error ("%<__int128%> invalid for %qs", name);
8316 else if (long_p && TREE_CODE (type) == REAL_TYPE)
8317 error ("%<long%> invalid for %qs", name);
8318 else if (short_p && TREE_CODE (type) == REAL_TYPE)
8319 error ("%<short%> invalid for %qs", name);
8320 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
8321 error ("%<long%> or %<short%> invalid for %qs", name);
8322 else if ((long_p || short_p || explicit_char || explicit_int) && explicit_int128)
8323 error ("%<long%>, %<int%>, %<short%>, or %<char%> invalid for %qs", name);
8324 else if ((long_p || short_p) && explicit_char)
8325 error ("%<long%> or %<short%> specified with char for %qs", name);
8326 else if (long_p && short_p)
8327 error ("%<long%> and %<short%> specified together for %qs", name);
8328 else if (type == char16_type_node || type == char32_type_node)
8330 if (signed_p || unsigned_p)
8331 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8332 else if (short_p || long_p)
8333 error ("%<short%> or %<long%> invalid for %qs", name);
8338 if (!explicit_int && !defaulted_int && !explicit_char && !explicit_int128 && pedantic)
8340 pedwarn (input_location, OPT_pedantic,
8341 "long, short, signed or unsigned used invalidly for %qs",
8343 if (flag_pedantic_errors)
8346 if (explicit_int128)
8348 if (int128_integer_type_node == NULL_TREE)
8350 error ("%<__int128%> is not supported by this target");
8355 pedwarn (input_location, OPT_pedantic,
8356 "ISO C++ does not support %<__int128%> for %qs",
8358 if (flag_pedantic_errors)
8364 /* Discard the type modifiers if they are invalid. */
8372 explicit_int128 = false;
8376 /* Decide whether an integer type is signed or not.
8377 Optionally treat bitfields as signed by default. */
8381 It is implementation-defined whether a plain (neither
8382 explicitly signed or unsigned) char, short, int, or long
8383 bit-field is signed or unsigned.
8385 Naturally, we extend this to long long as well. Note that
8386 this does not include wchar_t. */
8387 || (bitfield && !flag_signed_bitfields
8389 /* A typedef for plain `int' without `signed' can be
8390 controlled just like plain `int', but a typedef for
8391 `signed int' cannot be so controlled. */
8393 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
8394 && TREE_CODE (type) == INTEGER_TYPE
8395 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
8397 if (explicit_int128)
8398 type = int128_unsigned_type_node;
8400 type = long_long_unsigned_type_node;
8402 type = long_unsigned_type_node;
8404 type = short_unsigned_type_node;
8405 else if (type == char_type_node)
8406 type = unsigned_char_type_node;
8407 else if (typedef_decl)
8408 type = unsigned_type_for (type);
8410 type = unsigned_type_node;
8412 else if (signed_p && type == char_type_node)
8413 type = signed_char_type_node;
8414 else if (explicit_int128)
8415 type = int128_integer_type_node;
8417 type = long_long_integer_type_node;
8419 type = long_integer_type_node;
8421 type = short_integer_type_node;
8423 if (declspecs->specs[(int)ds_complex])
8425 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
8426 error ("complex invalid for %qs", name);
8427 /* If we just have "complex", it is equivalent to
8428 "complex double", but if any modifiers at all are specified it is
8429 the complex form of TYPE. E.g, "complex short" is
8430 "complex short int". */
8431 else if (defaulted_int && ! longlong && ! explicit_int128
8432 && ! (long_p || short_p || signed_p || unsigned_p))
8433 type = complex_double_type_node;
8434 else if (type == integer_type_node)
8435 type = complex_integer_type_node;
8436 else if (type == float_type_node)
8437 type = complex_float_type_node;
8438 else if (type == double_type_node)
8439 type = complex_double_type_node;
8440 else if (type == long_double_type_node)
8441 type = complex_long_double_type_node;
8443 type = build_complex_type (type);
8446 type_quals = TYPE_UNQUALIFIED;
8447 if (declspecs->specs[(int)ds_const])
8448 type_quals |= TYPE_QUAL_CONST;
8449 if (declspecs->specs[(int)ds_volatile])
8450 type_quals |= TYPE_QUAL_VOLATILE;
8451 if (declspecs->specs[(int)ds_restrict])
8452 type_quals |= TYPE_QUAL_RESTRICT;
8453 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
8454 error ("qualifiers are not allowed on declaration of %<operator %T%>",
8457 type_quals |= cp_type_quals (type);
8458 type = cp_build_qualified_type_real
8459 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
8460 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
8461 /* We might have ignored or rejected some of the qualifiers. */
8462 type_quals = cp_type_quals (type);
8465 inlinep = !! declspecs->specs[(int)ds_inline];
8466 virtualp = !! declspecs->specs[(int)ds_virtual];
8467 explicitp = !! declspecs->specs[(int)ds_explicit];
8469 storage_class = declspecs->storage_class;
8470 if (storage_class == sc_static)
8471 staticp = 1 + (decl_context == FIELD);
8473 if (virtualp && staticp == 2)
8475 error ("member %qD cannot be declared both virtual and static", dname);
8476 storage_class = sc_none;
8479 friendp = !! declspecs->specs[(int)ds_friend];
8481 if (dependent_name && !friendp)
8483 error ("%<%T::%D%> is not a valid declarator", ctype, dependent_name);
8484 return error_mark_node;
8487 /* Issue errors about use of storage classes for parameters. */
8488 if (decl_context == PARM)
8490 if (declspecs->specs[(int)ds_typedef])
8492 error ("typedef declaration invalid in parameter declaration");
8493 return error_mark_node;
8495 else if (template_parm_flag && storage_class != sc_none)
8497 error ("storage class specified for template parameter %qs", name);
8498 return error_mark_node;
8500 else if (storage_class == sc_static
8501 || storage_class == sc_extern
8503 error ("storage class specifiers invalid in parameter declarations");
8505 if (type_uses_auto (type))
8507 error ("parameter declared %<auto%>");
8508 type = error_mark_node;
8511 /* Function parameters cannot be constexpr. If we saw one, moan
8512 and pretend it wasn't there. */
8515 error ("a parameter cannot be declared %<constexpr%>");
8520 /* Give error if `virtual' is used outside of class declaration. */
8522 && (current_class_name == NULL_TREE || decl_context != FIELD))
8524 error ("%<virtual%> outside class declaration");
8528 /* Static anonymous unions are dealt with here. */
8529 if (staticp && decl_context == TYPENAME
8531 && ANON_AGGR_TYPE_P (declspecs->type))
8532 decl_context = FIELD;
8534 /* Warn about storage classes that are invalid for certain
8535 kinds of declarations (parameters, typenames, etc.). */
8538 && storage_class != sc_extern
8539 && storage_class != sc_static)
8540 || declspecs->specs[(int)ds_typedef]))
8542 error ("multiple storage classes in declaration of %qs", name);
8545 if (decl_context != NORMAL
8546 && ((storage_class != sc_none
8547 && storage_class != sc_mutable)
8550 if ((decl_context == PARM || decl_context == CATCHPARM)
8551 && (storage_class == sc_register
8552 || storage_class == sc_auto))
8554 else if (declspecs->specs[(int)ds_typedef])
8556 else if (decl_context == FIELD
8557 /* C++ allows static class elements. */
8558 && storage_class == sc_static)
8559 /* C++ also allows inlines and signed and unsigned elements,
8560 but in those cases we don't come in here. */
8564 if (decl_context == FIELD)
8565 error ("storage class specified for %qs", name);
8568 if (decl_context == PARM || decl_context == CATCHPARM)
8569 error ("storage class specified for parameter %qs", name);
8571 error ("storage class specified for typename");
8573 if (storage_class == sc_register
8574 || storage_class == sc_auto
8575 || storage_class == sc_extern
8577 storage_class = sc_none;
8580 else if (storage_class == sc_extern && funcdef_flag
8581 && ! toplevel_bindings_p ())
8582 error ("nested function %qs declared %<extern%>", name);
8583 else if (toplevel_bindings_p ())
8585 if (storage_class == sc_auto)
8586 error ("top-level declaration of %qs specifies %<auto%>", name);
8589 && storage_class != sc_extern
8590 && storage_class != sc_static)
8592 error ("function-scope %qs implicitly auto and declared %<__thread%>",
8597 if (storage_class && friendp)
8599 error ("storage class specifiers invalid in friend function declarations");
8600 storage_class = sc_none;
8605 unqualified_id = NULL_TREE;
8608 unqualified_id = id_declarator->u.id.unqualified_name;
8609 switch (TREE_CODE (unqualified_id))
8612 unqualified_id = TREE_OPERAND (unqualified_id, 0);
8613 if (TYPE_P (unqualified_id))
8614 unqualified_id = constructor_name (unqualified_id);
8617 case IDENTIFIER_NODE:
8618 case TEMPLATE_ID_EXPR:
8626 /* Determine the type of the entity declared by recurring on the
8628 for (; declarator; declarator = declarator->declarator)
8630 const cp_declarator *inner_declarator;
8633 if (type == error_mark_node)
8634 return error_mark_node;
8636 attrs = declarator->attributes;
8642 if (declarator == NULL || declarator->kind == cdk_id)
8643 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
8644 if (declarator->kind == cdk_function)
8645 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
8646 if (declarator->kind == cdk_array)
8647 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
8648 returned_attrs = decl_attributes (&type,
8649 chainon (returned_attrs, attrs),
8653 if (declarator->kind == cdk_id)
8656 inner_declarator = declarator->declarator;
8658 switch (declarator->kind)
8661 type = create_array_type_for_decl (dname, type,
8662 declarator->u.array.bounds);
8670 /* Declaring a function type.
8671 Make sure we have a valid type for the function to return. */
8673 if (type_quals != TYPE_UNQUALIFIED)
8675 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
8676 warning (OPT_Wignored_qualifiers,
8677 "type qualifiers ignored on function return type");
8678 /* We now know that the TYPE_QUALS don't apply to the
8679 decl, but to its return type. */
8680 type_quals = TYPE_UNQUALIFIED;
8682 errmsg = targetm.invalid_return_type (type);
8686 type = integer_type_node;
8689 /* Error about some types functions can't return. */
8691 if (TREE_CODE (type) == FUNCTION_TYPE)
8693 error ("%qs declared as function returning a function", name);
8694 return error_mark_node;
8696 if (TREE_CODE (type) == ARRAY_TYPE)
8698 error ("%qs declared as function returning an array", name);
8699 return error_mark_node;
8702 /* Pick up type qualifiers which should be applied to `this'. */
8703 memfn_quals = declarator->u.function.qualifiers;
8705 /* Pick up the exception specifications. */
8706 raises = declarator->u.function.exception_specification;
8708 /* Say it's a definition only for the CALL_EXPR
8709 closest to the identifier. */
8710 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
8712 /* Handle a late-specified return type. */
8715 if (type_uses_auto (type))
8717 if (!declarator->u.function.late_return_type)
8719 error ("%qs function uses %<auto%> type specifier without"
8720 " late return type", name);
8721 return error_mark_node;
8723 else if (!is_auto (type))
8725 error ("%qs function with late return type has"
8726 " %qT as its type rather than plain %<auto%>",
8728 return error_mark_node;
8731 else if (declarator->u.function.late_return_type)
8733 error ("%qs function with late return type not declared"
8734 " with %<auto%> type specifier", name);
8735 return error_mark_node;
8738 type = splice_late_return_type
8739 (type, declarator->u.function.late_return_type);
8740 if (type == error_mark_node)
8741 return error_mark_node;
8743 if (ctype == NULL_TREE
8744 && decl_context == FIELD
8746 && (friendp == 0 || dname == current_class_name))
8747 ctype = current_class_type;
8749 if (ctype && (sfk == sfk_constructor
8750 || sfk == sfk_destructor))
8752 /* We are within a class's scope. If our declarator name
8753 is the same as the class name, and we are defining
8754 a function, then it is a constructor/destructor, and
8755 therefore returns a void type. */
8757 /* ISO C++ 12.4/2. A destructor may not be declared
8758 const or volatile. A destructor may not be
8761 ISO C++ 12.1. A constructor may not be declared
8762 const or volatile. A constructor may not be
8763 virtual. A constructor may not be static. */
8765 error ((flags == DTOR_FLAG)
8766 ? "destructor cannot be static member function"
8767 : "constructor cannot be static member function");
8770 error ((flags == DTOR_FLAG)
8771 ? "destructors may not be cv-qualified"
8772 : "constructors may not be cv-qualified");
8773 memfn_quals = TYPE_UNQUALIFIED;
8776 if (decl_context == FIELD
8777 && !member_function_or_else (ctype,
8780 return error_mark_node;
8782 if (flags != DTOR_FLAG)
8784 /* It's a constructor. */
8789 permerror (input_location, "constructors cannot be declared virtual");
8792 if (decl_context == FIELD
8793 && sfk != sfk_constructor)
8794 return error_mark_node;
8796 if (decl_context == FIELD)
8802 error ("can%'t initialize friend function %qs", name);
8805 /* Cannot be both friend and virtual. */
8806 error ("virtual functions cannot be friends");
8809 if (decl_context == NORMAL)
8810 error ("friend declaration not in class definition");
8811 if (current_function_decl && funcdef_flag)
8812 error ("can%'t define friend function %qs in a local "
8816 else if (ctype && sfk == sfk_conversion)
8820 maybe_warn_cpp0x (CPP0X_EXPLICIT_CONVERSION);
8825 arg_types = grokparms (declarator->u.function.parameters,
8828 if (inner_declarator
8829 && inner_declarator->kind == cdk_id
8830 && inner_declarator->u.id.sfk == sfk_destructor
8831 && arg_types != void_list_node)
8833 error ("destructors may not have parameters");
8834 arg_types = void_list_node;
8838 type = build_function_type (type, arg_types);
8845 /* Filter out pointers-to-references and references-to-references.
8846 We can get these if a TYPE_DECL is used. */
8848 if (TREE_CODE (type) == REFERENCE_TYPE)
8850 if (declarator->kind != cdk_reference)
8852 error ("cannot declare pointer to %q#T", type);
8853 type = TREE_TYPE (type);
8856 /* In C++0x, we allow reference to reference declarations
8857 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
8858 and template type arguments [14.3.1/4 temp.arg.type]. The
8859 check for direct reference to reference declarations, which
8860 are still forbidden, occurs below. Reasoning behind the change
8861 can be found in DR106, DR540, and the rvalue reference
8863 else if (cxx_dialect == cxx98)
8865 error ("cannot declare reference to %q#T", type);
8866 type = TREE_TYPE (type);
8869 else if (VOID_TYPE_P (type))
8871 if (declarator->kind == cdk_reference)
8872 error ("cannot declare reference to %q#T", type);
8873 else if (declarator->kind == cdk_ptrmem)
8874 error ("cannot declare pointer to %q#T member", type);
8877 /* We now know that the TYPE_QUALS don't apply to the decl,
8878 but to the target of the pointer. */
8879 type_quals = TYPE_UNQUALIFIED;
8881 if (declarator->kind == cdk_ptrmem
8882 && (TREE_CODE (type) == FUNCTION_TYPE
8883 || (memfn_quals && TREE_CODE (type) == METHOD_TYPE)))
8885 memfn_quals |= type_memfn_quals (type);
8886 type = build_memfn_type (type,
8887 declarator->u.pointer.class_type,
8889 if (type == error_mark_node)
8890 return error_mark_node;
8891 memfn_quals = TYPE_UNQUALIFIED;
8894 if (TREE_CODE (type) == FUNCTION_TYPE
8895 && type_memfn_quals (type) != TYPE_UNQUALIFIED)
8896 error (declarator->kind == cdk_reference
8897 ? G_("cannot declare reference to qualified function type %qT")
8898 : G_("cannot declare pointer to qualified function type %qT"),
8901 /* When the pointed-to type involves components of variable size,
8902 care must be taken to ensure that the size evaluation code is
8903 emitted early enough to dominate all the possible later uses
8904 and late enough for the variables on which it depends to have
8907 This is expected to happen automatically when the pointed-to
8908 type has a name/declaration of it's own, but special attention
8909 is required if the type is anonymous.
8911 We handle the NORMAL and FIELD contexts here by inserting a
8912 dummy statement that just evaluates the size at a safe point
8913 and ensures it is not deferred until e.g. within a deeper
8914 conditional context (c++/43555).
8916 We expect nothing to be needed here for PARM or TYPENAME.
8917 Evaluating the size at this point for TYPENAME would
8918 actually be incorrect, as we might be in the middle of an
8919 expression with side effects on the pointed-to type size
8920 "arguments" prior to the pointer declaration point and the
8921 size evaluation could end up prior to the side effects. */
8923 if (!TYPE_NAME (type)
8924 && (decl_context == NORMAL || decl_context == FIELD)
8925 && at_function_scope_p ()
8926 && variably_modified_type_p (type, NULL_TREE))
8927 finish_expr_stmt (TYPE_SIZE (type));
8929 if (declarator->kind == cdk_reference)
8931 /* In C++0x, the type we are creating a reference to might be
8932 a typedef which is itself a reference type. In that case,
8933 we follow the reference collapsing rules in
8934 [7.1.3/8 dcl.typedef] to create the final reference type:
8936 "If a typedef TD names a type that is a reference to a type
8937 T, an attempt to create the type 'lvalue reference to cv TD'
8938 creates the type 'lvalue reference to T,' while an attempt
8939 to create the type "rvalue reference to cv TD' creates the
8942 if (!VOID_TYPE_P (type))
8943 type = cp_build_reference_type
8944 ((TREE_CODE (type) == REFERENCE_TYPE
8945 ? TREE_TYPE (type) : type),
8946 (declarator->u.reference.rvalue_ref
8947 && (TREE_CODE(type) != REFERENCE_TYPE
8948 || TYPE_REF_IS_RVALUE (type))));
8950 /* In C++0x, we need this check for direct reference to
8951 reference declarations, which are forbidden by
8952 [8.3.2/5 dcl.ref]. Reference to reference declarations
8953 are only allowed indirectly through typedefs and template
8954 type arguments. Example:
8956 void foo(int & &); // invalid ref-to-ref decl
8958 typedef int & int_ref;
8959 void foo(int_ref &); // valid ref-to-ref decl
8961 if (inner_declarator && inner_declarator->kind == cdk_reference)
8962 error ("cannot declare reference to %q#T, which is not "
8963 "a typedef or a template type argument", type);
8965 else if (TREE_CODE (type) == METHOD_TYPE)
8966 type = build_ptrmemfunc_type (build_pointer_type (type));
8967 else if (declarator->kind == cdk_ptrmem)
8969 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
8971 if (declarator->u.pointer.class_type == error_mark_node)
8972 /* We will already have complained. */
8973 type = error_mark_node;
8975 type = build_ptrmem_type (declarator->u.pointer.class_type,
8979 type = build_pointer_type (type);
8981 /* Process a list of type modifier keywords (such as
8982 const or volatile) that were given inside the `*' or `&'. */
8984 if (declarator->u.pointer.qualifiers)
8987 = cp_build_qualified_type (type,
8988 declarator->u.pointer.qualifiers);
8989 type_quals = cp_type_quals (type);
9002 /* A `constexpr' specifier used in an object declaration declares
9003 the object as `const'. */
9004 if (constexpr_p && innermost_code != cdk_function)
9006 if (type_quals & TYPE_QUAL_CONST)
9007 error ("both %<const%> and %<constexpr%> cannot be used here");
9008 if (type_quals & TYPE_QUAL_VOLATILE)
9009 error ("both %<volatile%> and %<constexpr%> cannot be used here");
9010 type_quals |= TYPE_QUAL_CONST;
9011 type = cp_build_qualified_type (type, type_quals);
9014 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
9015 && TREE_CODE (type) != FUNCTION_TYPE
9016 && TREE_CODE (type) != METHOD_TYPE)
9018 error ("template-id %qD used as a declarator",
9020 unqualified_id = dname;
9023 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
9024 qualified with a class-name, turn it into a METHOD_TYPE, unless
9025 we know that the function is static. We take advantage of this
9026 opportunity to do other processing that pertains to entities
9027 explicitly declared to be class members. Note that if DECLARATOR
9028 is non-NULL, we know it is a cdk_id declarator; otherwise, we
9029 would not have exited the loop above. */
9031 && declarator->u.id.qualifying_scope
9032 && TYPE_P (declarator->u.id.qualifying_scope))
9036 ctype = declarator->u.id.qualifying_scope;
9037 ctype = TYPE_MAIN_VARIANT (ctype);
9039 while (t != NULL_TREE && CLASS_TYPE_P (t))
9041 /* You're supposed to have one `template <...>' for every
9042 template class, but you don't need one for a full
9043 specialization. For example:
9045 template <class T> struct S{};
9046 template <> struct S<int> { void f(); };
9047 void S<int>::f () {}
9049 is correct; there shouldn't be a `template <>' for the
9050 definition of `S<int>::f'. */
9051 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
9052 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
9053 /* T is an explicit (not partial) specialization. All
9054 containing classes must therefore also be explicitly
9057 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
9058 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
9059 template_count += 1;
9061 t = TYPE_MAIN_DECL (t);
9062 t = DECL_CONTEXT (t);
9065 if (ctype == current_class_type)
9069 permerror (input_location, "member functions are implicitly friends of their class");
9073 permerror (declarator->id_loc,
9074 "extra qualification %<%T::%> on member %qs",
9077 else if (/* If the qualifying type is already complete, then we
9078 can skip the following checks. */
9079 !COMPLETE_TYPE_P (ctype)
9080 && (/* If the function is being defined, then
9081 qualifying type must certainly be complete. */
9083 /* A friend declaration of "T::f" is OK, even if
9084 "T" is a template parameter. But, if this
9085 function is not a friend, the qualifying type
9087 || (!friendp && !CLASS_TYPE_P (ctype))
9088 /* For a declaration, the type need not be
9089 complete, if either it is dependent (since there
9090 is no meaningful definition of complete in that
9091 case) or the qualifying class is currently being
9093 || !(dependent_type_p (ctype)
9094 || currently_open_class (ctype)))
9095 /* Check that the qualifying type is complete. */
9096 && !complete_type_or_else (ctype, NULL_TREE))
9097 return error_mark_node;
9098 else if (TREE_CODE (type) == FUNCTION_TYPE)
9100 if (current_class_type
9101 && (!friendp || funcdef_flag))
9104 ? "cannot define member function %<%T::%s%> within %<%T%>"
9105 : "cannot declare member function %<%T::%s%> within %<%T%>",
9106 ctype, name, current_class_type);
9107 return error_mark_node;
9110 else if (declspecs->specs[(int)ds_typedef]
9111 && current_class_type)
9113 error ("cannot declare member %<%T::%s%> within %qT",
9114 ctype, name, current_class_type);
9115 return error_mark_node;
9119 if (ctype == NULL_TREE && decl_context == FIELD && friendp == 0)
9120 ctype = current_class_type;
9122 /* A constexpr non-static member function is implicitly const. */
9123 if (constexpr_p && ctype && staticp == 0
9124 && TREE_CODE (type) == FUNCTION_TYPE
9125 && sfk != sfk_constructor && sfk != sfk_destructor)
9126 memfn_quals |= TYPE_QUAL_CONST;
9128 /* Now TYPE has the actual type. */
9133 *attrlist = chainon (returned_attrs, *attrlist);
9135 attrlist = &returned_attrs;
9138 /* Handle parameter packs. */
9139 if (parameter_pack_p)
9141 if (decl_context == PARM)
9142 /* Turn the type into a pack expansion.*/
9143 type = make_pack_expansion (type);
9145 error ("non-parameter %qs cannot be a parameter pack", name);
9148 /* Did array size calculations overflow? */
9150 if (TREE_CODE (type) == ARRAY_TYPE
9151 && COMPLETE_TYPE_P (type)
9152 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
9153 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
9155 error ("size of array %qs is too large", name);
9156 /* If we proceed with the array type as it is, we'll eventually
9157 crash in tree_low_cst(). */
9158 type = error_mark_node;
9161 if ((decl_context == FIELD || decl_context == PARM)
9162 && !processing_template_decl
9163 && variably_modified_type_p (type, NULL_TREE))
9165 if (decl_context == FIELD)
9166 error ("data member may not have variably modified type %qT", type);
9168 error ("parameter may not have variably modified type %qT", type);
9169 type = error_mark_node;
9172 if (explicitp == 1 || (explicitp && friendp))
9174 /* [dcl.fct.spec] The explicit specifier shall only be used in
9175 declarations of constructors within a class definition. */
9176 error ("only declarations of constructors can be %<explicit%>");
9180 if (storage_class == sc_mutable)
9182 if (decl_context != FIELD || friendp)
9184 error ("non-member %qs cannot be declared %<mutable%>", name);
9185 storage_class = sc_none;
9187 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
9189 error ("non-object member %qs cannot be declared %<mutable%>", name);
9190 storage_class = sc_none;
9192 else if (TREE_CODE (type) == FUNCTION_TYPE
9193 || TREE_CODE (type) == METHOD_TYPE)
9195 error ("function %qs cannot be declared %<mutable%>", name);
9196 storage_class = sc_none;
9200 error ("static %qs cannot be declared %<mutable%>", name);
9201 storage_class = sc_none;
9203 else if (type_quals & TYPE_QUAL_CONST)
9205 error ("const %qs cannot be declared %<mutable%>", name);
9206 storage_class = sc_none;
9210 /* If this is declaring a typedef name, return a TYPE_DECL. */
9211 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
9215 /* Note that the grammar rejects storage classes
9216 in typenames, fields or parameters. */
9217 if (current_lang_name == lang_name_java)
9218 TYPE_FOR_JAVA (type) = 1;
9220 /* This declaration:
9222 typedef void f(int) const;
9224 declares a function type which is not a member of any
9225 particular class, but which is cv-qualified; for
9226 example "f S::*" declares a pointer to a const-qualified
9227 member function of S. We record the cv-qualification in the
9229 if (memfn_quals && TREE_CODE (type) == FUNCTION_TYPE)
9231 type = apply_memfn_quals (type, memfn_quals);
9233 /* We have now dealt with these qualifiers. */
9234 memfn_quals = TYPE_UNQUALIFIED;
9237 if (decl_context == FIELD)
9238 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
9240 decl = build_decl (input_location, TYPE_DECL, unqualified_id, type);
9241 if (id_declarator && declarator->u.id.qualifying_scope) {
9242 error_at (DECL_SOURCE_LOCATION (decl),
9243 "typedef name may not be a nested-name-specifier");
9244 TREE_TYPE (decl) = error_mark_node;
9247 if (decl_context != FIELD)
9249 if (!current_function_decl)
9250 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
9251 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
9252 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
9253 (current_function_decl)))
9254 /* The TYPE_DECL is "abstract" because there will be
9255 clones of this constructor/destructor, and there will
9256 be copies of this TYPE_DECL generated in those
9258 DECL_ABSTRACT (decl) = 1;
9260 else if (constructor_name_p (unqualified_id, current_class_type))
9261 permerror (input_location, "ISO C++ forbids nested type %qD with same name "
9262 "as enclosing class",
9265 /* If the user declares "typedef struct {...} foo" then the
9266 struct will have an anonymous name. Fill that name in now.
9267 Nothing can refer to it, so nothing needs know about the name
9269 if (type != error_mark_node
9272 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
9273 && TYPE_ANONYMOUS_P (type)
9274 && cp_type_quals (type) == TYPE_UNQUALIFIED)
9278 /* Replace the anonymous name with the real name everywhere. */
9279 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
9281 if (ANON_AGGRNAME_P (TYPE_IDENTIFIER (t)))
9282 /* We do not rename the debug info representing the
9283 anonymous tagged type because the standard says in
9284 [dcl.typedef] that the naming applies only for
9285 linkage purposes. */
9286 /*debug_hooks->set_name (t, decl);*/
9287 TYPE_NAME (t) = decl;
9290 if (TYPE_LANG_SPECIFIC (type))
9291 TYPE_WAS_ANONYMOUS (type) = 1;
9293 /* If this is a typedef within a template class, the nested
9294 type is a (non-primary) template. The name for the
9295 template needs updating as well. */
9296 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
9297 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
9298 = TYPE_IDENTIFIER (type);
9300 /* Adjust linkage now that we aren't anonymous anymore. */
9301 set_linkage_according_to_type (type, TYPE_MAIN_DECL (type));
9302 determine_visibility (TYPE_MAIN_DECL (type));
9304 /* FIXME remangle member functions; member functions of a
9305 type with external linkage have external linkage. */
9309 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
9310 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
9312 bad_specifiers (decl, BSP_TYPE, virtualp,
9313 memfn_quals != TYPE_UNQUALIFIED,
9314 inlinep, friendp, raises != NULL_TREE);
9319 /* Detect the case of an array type of unspecified size
9320 which came, as such, direct from a typedef name.
9321 We must copy the type, so that the array's domain can be
9322 individually set by the object's initializer. */
9324 if (type && typedef_type
9325 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
9326 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
9327 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
9329 /* Detect where we're using a typedef of function type to declare a
9330 function. PARMS will not be set, so we must create it now. */
9332 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
9334 tree decls = NULL_TREE;
9337 for (args = TYPE_ARG_TYPES (type);
9338 args && args != void_list_node;
9339 args = TREE_CHAIN (args))
9341 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
9343 DECL_CHAIN (decl) = decls;
9347 parms = nreverse (decls);
9349 if (decl_context != TYPENAME)
9351 /* A cv-qualifier-seq shall only be part of the function type
9352 for a non-static member function. [8.3.5/4 dcl.fct] */
9353 if (type_memfn_quals (type) != TYPE_UNQUALIFIED
9354 && (current_class_type == NULL_TREE || staticp) )
9357 ? G_("qualified function types cannot be used to "
9358 "declare static member functions")
9359 : G_("qualified function types cannot be used to "
9360 "declare free functions"));
9361 type = TYPE_MAIN_VARIANT (type);
9364 /* The qualifiers on the function type become the qualifiers on
9365 the non-static member function. */
9366 memfn_quals |= type_memfn_quals (type);
9367 type_quals = TYPE_UNQUALIFIED;
9371 /* If this is a type name (such as, in a cast or sizeof),
9372 compute the type and return it now. */
9374 if (decl_context == TYPENAME)
9376 /* Note that the grammar rejects storage classes
9377 in typenames, fields or parameters. */
9378 if (type_quals != TYPE_UNQUALIFIED)
9379 type_quals = TYPE_UNQUALIFIED;
9381 /* Special case: "friend class foo" looks like a TYPENAME context. */
9384 if (type_quals != TYPE_UNQUALIFIED)
9386 error ("type qualifiers specified for friend class declaration");
9387 type_quals = TYPE_UNQUALIFIED;
9391 error ("%<inline%> specified for friend class declaration");
9397 /* Don't allow friend declaration without a class-key. */
9398 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
9399 permerror (input_location, "template parameters cannot be friends");
9400 else if (TREE_CODE (type) == TYPENAME_TYPE)
9401 permerror (input_location, "friend declaration requires class-key, "
9402 "i.e. %<friend class %T::%D%>",
9403 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
9405 permerror (input_location, "friend declaration requires class-key, "
9406 "i.e. %<friend %#T%>",
9410 /* Only try to do this stuff if we didn't already give up. */
9411 if (type != integer_type_node)
9413 /* A friendly class? */
9414 if (current_class_type)
9415 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
9418 error ("trying to make class %qT a friend of global scope",
9421 type = void_type_node;
9424 else if (memfn_quals)
9426 if (ctype == NULL_TREE
9427 && TREE_CODE (type) == METHOD_TYPE)
9428 ctype = TYPE_METHOD_BASETYPE (type);
9431 type = build_memfn_type (type, ctype, memfn_quals);
9432 /* Core issue #547: need to allow this in template type args. */
9433 else if (template_type_arg && TREE_CODE (type) == FUNCTION_TYPE)
9434 type = apply_memfn_quals (type, memfn_quals);
9436 error ("invalid qualifiers on non-member function type");
9441 else if (unqualified_id == NULL_TREE && decl_context != PARM
9442 && decl_context != CATCHPARM
9443 && TREE_CODE (type) != UNION_TYPE
9446 error ("abstract declarator %qT used as declaration", type);
9447 return error_mark_node;
9450 /* Only functions may be declared using an operator-function-id. */
9452 && IDENTIFIER_OPNAME_P (unqualified_id)
9453 && TREE_CODE (type) != FUNCTION_TYPE
9454 && TREE_CODE (type) != METHOD_TYPE)
9456 error ("declaration of %qD as non-function", unqualified_id);
9457 return error_mark_node;
9460 /* We don't check parameter types here because we can emit a better
9461 error message later. */
9462 if (decl_context != PARM)
9464 type = check_var_type (unqualified_id, type);
9465 if (type == error_mark_node)
9466 return error_mark_node;
9469 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
9470 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
9472 if (decl_context == PARM || decl_context == CATCHPARM)
9474 if (ctype || in_namespace)
9475 error ("cannot use %<::%> in parameter declaration");
9477 /* A parameter declared as an array of T is really a pointer to T.
9478 One declared as a function is really a pointer to a function.
9479 One declared as a member is really a pointer to member. */
9481 if (TREE_CODE (type) == ARRAY_TYPE)
9483 /* Transfer const-ness of array into that of type pointed to. */
9484 type = build_pointer_type (TREE_TYPE (type));
9485 type_quals = TYPE_UNQUALIFIED;
9487 else if (TREE_CODE (type) == FUNCTION_TYPE)
9488 type = build_pointer_type (type);
9491 if (ctype && TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
9492 && !NEW_DELETE_OPNAME_P (unqualified_id))
9493 type = build_memfn_type (type, ctype, memfn_quals);
9498 if (decl_context == PARM)
9500 decl = cp_build_parm_decl (unqualified_id, type);
9502 bad_specifiers (decl, BSP_PARM, virtualp,
9503 memfn_quals != TYPE_UNQUALIFIED,
9504 inlinep, friendp, raises != NULL_TREE);
9506 else if (decl_context == FIELD)
9508 /* The C99 flexible array extension. */
9509 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
9510 && TYPE_DOMAIN (type) == NULL_TREE)
9512 tree itype = compute_array_index_type (dname, integer_zero_node,
9513 tf_warning_or_error);
9514 type = build_cplus_array_type (TREE_TYPE (type), itype);
9517 if (type == error_mark_node)
9519 /* Happens when declaring arrays of sizes which
9520 are error_mark_node, for example. */
9523 else if (in_namespace && !friendp)
9525 /* Something like struct S { int N::j; }; */
9526 error ("invalid use of %<::%>");
9527 return error_mark_node;
9529 else if (TREE_CODE (type) == FUNCTION_TYPE
9530 || TREE_CODE (type) == METHOD_TYPE)
9533 tree function_context;
9537 /* This should never happen in pure C++ (the check
9538 could be an assert). It could happen in
9539 Objective-C++ if someone writes invalid code that
9540 uses a function declaration for an instance
9541 variable or property (instance variables and
9542 properties are parsed as FIELD_DECLs, but they are
9543 part of an Objective-C class, not a C++ class).
9544 That code is invalid and is caught by this
9548 error ("declaration of function %qD in invalid context",
9550 return error_mark_node;
9553 /* ``A union may [ ... ] not [ have ] virtual functions.''
9555 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
9557 error ("function %qD declared virtual inside a union",
9559 return error_mark_node;
9562 if (NEW_DELETE_OPNAME_P (unqualified_id))
9566 error ("%qD cannot be declared virtual, since it "
9574 /* Check that the name used for a destructor makes sense. */
9575 if (sfk == sfk_destructor)
9577 tree uqname = id_declarator->u.id.unqualified_name;
9581 gcc_assert (friendp);
9582 error ("expected qualified name in friend declaration "
9583 "for destructor %qD", uqname);
9584 return error_mark_node;
9587 if (!check_dtor_name (ctype, TREE_OPERAND (uqname, 0)))
9589 error ("declaration of %qD as member of %qT",
9591 return error_mark_node;
9595 error ("a destructor cannot be %<constexpr%>");
9596 return error_mark_node;
9599 else if (sfk == sfk_constructor && friendp && !ctype)
9601 error ("expected qualified name in friend declaration "
9602 "for constructor %qD",
9603 id_declarator->u.id.unqualified_name);
9604 return error_mark_node;
9607 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
9608 function_context = (ctype != NULL_TREE) ?
9609 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
9610 publicp = (! friendp || ! staticp)
9611 && function_context == NULL_TREE;
9612 decl = grokfndecl (ctype, type,
9613 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
9614 ? unqualified_id : dname,
9617 virtualp, flags, memfn_quals, raises,
9618 friendp ? -1 : 0, friendp, publicp,
9619 inlinep | (2 * constexpr_p),
9621 funcdef_flag, template_count, in_namespace,
9622 attrlist, declarator->id_loc);
9623 if (decl == NULL_TREE)
9624 return error_mark_node;
9626 /* This clobbers the attrs stored in `decl' from `attrlist'. */
9627 /* The decl and setting of decl_attr is also turned off. */
9628 decl = build_decl_attribute_variant (decl, decl_attr);
9631 /* [class.conv.ctor]
9633 A constructor declared without the function-specifier
9634 explicit that can be called with a single parameter
9635 specifies a conversion from the type of its first
9636 parameter to the type of its class. Such a constructor
9637 is called a converting constructor. */
9639 DECL_NONCONVERTING_P (decl) = 1;
9641 else if (!staticp && !dependent_type_p (type)
9642 && !COMPLETE_TYPE_P (complete_type (type))
9643 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
9646 error ("field %qD has incomplete type", unqualified_id);
9648 error ("name %qT has incomplete type", type);
9650 /* If we're instantiating a template, tell them which
9651 instantiation made the field's type be incomplete. */
9652 if (current_class_type
9653 && TYPE_NAME (current_class_type)
9654 && IDENTIFIER_TEMPLATE (TYPE_IDENTIFIER (current_class_type))
9656 && declspecs->type == type)
9657 error (" in instantiation of template %qT",
9658 current_class_type);
9660 return error_mark_node;
9666 error ("%qE is neither function nor member function; "
9667 "cannot be declared friend", unqualified_id);
9675 /* Friends are treated specially. */
9676 if (ctype == current_class_type)
9677 ; /* We already issued a permerror. */
9678 else if (decl && DECL_NAME (decl))
9680 if (template_class_depth (current_class_type) == 0)
9682 decl = check_explicit_specialization
9683 (unqualified_id, decl, template_count,
9684 2 * funcdef_flag + 4);
9685 if (decl == error_mark_node)
9686 return error_mark_node;
9689 DECL_DECLARED_CONSTEXPR_P (decl) = constexpr_p;
9690 decl = do_friend (ctype, unqualified_id, decl,
9696 return error_mark_node;
9699 /* Structure field. It may not be a function, except for C++. */
9701 if (decl == NULL_TREE)
9707 /* An attempt is being made to initialize a non-static
9708 member. But, from [class.mem]:
9710 4 A member-declarator can contain a
9711 constant-initializer only if it declares a static
9712 member (_class.static_) of integral or enumeration
9713 type, see _class.static.data_.
9715 This used to be relatively common practice, but
9716 the rest of the compiler does not correctly
9717 handle the initialization unless the member is
9718 static so we make it static below. */
9719 if (cxx_dialect >= cxx0x)
9721 sorry ("non-static data member initializers");
9725 permerror (input_location, "ISO C++ forbids initialization of member %qD",
9727 permerror (input_location, "making %qD static", unqualified_id);
9732 if (uses_template_parms (type))
9733 /* We'll check at instantiation time. */
9735 else if (constexpr_p)
9736 /* constexpr has the same requirements. */
9738 else if (check_static_variable_definition (unqualified_id,
9740 /* If we just return the declaration, crashes
9741 will sometimes occur. We therefore return
9742 void_type_node, as if this was a friend
9743 declaration, to cause callers to completely
9744 ignore this declaration. */
9745 return error_mark_node;
9750 /* C++ allows static class members. All other work
9751 for this is done by grokfield. */
9752 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
9753 set_linkage_for_static_data_member (decl);
9754 /* Even if there is an in-class initialization, DECL
9755 is considered undefined until an out-of-class
9756 definition is provided. */
9757 DECL_EXTERNAL (decl) = 1;
9760 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
9766 error ("non-static data member %qE declared %<constexpr%>",
9768 constexpr_p = false;
9770 decl = build_decl (input_location,
9771 FIELD_DECL, unqualified_id, type);
9772 DECL_NONADDRESSABLE_P (decl) = bitfield;
9773 if (bitfield && !unqualified_id)
9774 TREE_NO_WARNING (decl) = 1;
9776 if (storage_class == sc_mutable)
9778 DECL_MUTABLE_P (decl) = 1;
9779 storage_class = sc_none;
9783 bad_specifiers (decl, BSP_FIELD, virtualp,
9784 memfn_quals != TYPE_UNQUALIFIED,
9785 inlinep, friendp, raises != NULL_TREE);
9788 else if (TREE_CODE (type) == FUNCTION_TYPE
9789 || TREE_CODE (type) == METHOD_TYPE)
9794 if (!unqualified_id)
9795 return error_mark_node;
9797 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
9798 original_name = dname;
9800 original_name = unqualified_id;
9802 if (storage_class == sc_auto)
9803 error ("storage class %<auto%> invalid for function %qs", name);
9804 else if (storage_class == sc_register)
9805 error ("storage class %<register%> invalid for function %qs", name);
9807 error ("storage class %<__thread%> invalid for function %qs", name);
9809 /* Function declaration not at top level.
9810 Storage classes other than `extern' are not allowed
9811 and `extern' makes no difference. */
9812 if (! toplevel_bindings_p ()
9813 && (storage_class == sc_static
9814 || declspecs->specs[(int)ds_inline])
9817 if (storage_class == sc_static)
9818 pedwarn (input_location, OPT_pedantic,
9819 "%<static%> specified invalid for function %qs "
9820 "declared out of global scope", name);
9822 pedwarn (input_location, OPT_pedantic,
9823 "%<inline%> specifier invalid for function %qs "
9824 "declared out of global scope", name);
9827 if (ctype != NULL_TREE
9828 && TREE_CODE (ctype) != NAMESPACE_DECL && !MAYBE_CLASS_TYPE_P (ctype))
9830 error ("%q#T is not a class or a namespace", ctype);
9834 if (ctype == NULL_TREE)
9838 error ("virtual non-class function %qs", name);
9841 else if (sfk == sfk_constructor
9842 || sfk == sfk_destructor)
9845 ? "%qs defined in a non-class scope"
9846 : "%qs declared in a non-class scope", name);
9851 /* Record presence of `static'. */
9852 publicp = (ctype != NULL_TREE
9853 || storage_class == sc_extern
9854 || storage_class != sc_static);
9856 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
9857 virtualp, flags, memfn_quals, raises,
9859 publicp, inlinep | (2 * constexpr_p), sfk,
9861 template_count, in_namespace, attrlist,
9862 declarator->id_loc);
9863 if (decl == NULL_TREE)
9864 return error_mark_node;
9868 int invalid_static = 0;
9870 /* Don't allow a static member function in a class, and forbid
9871 declaring main to be static. */
9872 if (TREE_CODE (type) == METHOD_TYPE)
9874 permerror (input_location, "cannot declare member function %qD to have "
9875 "static linkage", decl);
9878 else if (current_function_decl)
9880 /* FIXME need arm citation */
9881 error ("cannot declare static function inside another function");
9888 storage_class = sc_none;
9894 /* It's a variable. */
9896 /* An uninitialized decl with `extern' is a reference. */
9897 decl = grokvardecl (type, unqualified_id,
9900 (type_quals & TYPE_QUAL_CONST) != 0,
9901 ctype ? ctype : in_namespace);
9902 bad_specifiers (decl, BSP_VAR, virtualp,
9903 memfn_quals != TYPE_UNQUALIFIED,
9904 inlinep, friendp, raises != NULL_TREE);
9908 DECL_CONTEXT (decl) = ctype;
9911 permerror (input_location, "%<static%> may not be used when defining "
9912 "(as opposed to declaring) a static data member");
9914 storage_class = sc_none;
9916 if (storage_class == sc_register && TREE_STATIC (decl))
9918 error ("static member %qD declared %<register%>", decl);
9919 storage_class = sc_none;
9921 if (storage_class == sc_extern && pedantic)
9923 pedwarn (input_location, OPT_pedantic,
9924 "cannot explicitly declare member %q#D to have "
9925 "extern linkage", decl);
9926 storage_class = sc_none;
9929 else if (constexpr_p && DECL_EXTERNAL (decl))
9930 error ("declaration of constexpr variable %qD is not a definition",
9934 if (storage_class == sc_extern && initialized && !funcdef_flag)
9936 if (toplevel_bindings_p ())
9938 /* It's common practice (and completely valid) to have a const
9939 be initialized and declared extern. */
9940 if (!(type_quals & TYPE_QUAL_CONST))
9941 warning (0, "%qs initialized and declared %<extern%>", name);
9945 error ("%qs has both %<extern%> and initializer", name);
9946 return error_mark_node;
9950 /* Record `register' declaration for warnings on &
9951 and in case doing stupid register allocation. */
9953 if (storage_class == sc_register)
9954 DECL_REGISTER (decl) = 1;
9955 else if (storage_class == sc_extern)
9956 DECL_THIS_EXTERN (decl) = 1;
9957 else if (storage_class == sc_static)
9958 DECL_THIS_STATIC (decl) = 1;
9960 /* Don't forget constexprness. */
9962 DECL_DECLARED_CONSTEXPR_P (decl) = true;
9964 /* Record constancy and volatility on the DECL itself . There's
9965 no need to do this when processing a template; we'll do this
9966 for the instantiated declaration based on the type of DECL. */
9967 if (!processing_template_decl)
9968 cp_apply_type_quals_to_decl (type_quals, decl);
9974 /* Subroutine of start_function. Ensure that each of the parameter
9975 types (as listed in PARMS) is complete, as is required for a
9976 function definition. */
9979 require_complete_types_for_parms (tree parms)
9981 for (; parms; parms = DECL_CHAIN (parms))
9983 if (dependent_type_p (TREE_TYPE (parms)))
9985 if (!VOID_TYPE_P (TREE_TYPE (parms))
9986 && complete_type_or_else (TREE_TYPE (parms), parms))
9988 relayout_decl (parms);
9989 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
9992 /* grokparms or complete_type_or_else will have already issued
9994 TREE_TYPE (parms) = error_mark_node;
9998 /* Returns nonzero if T is a local variable. */
10001 local_variable_p (const_tree t)
10003 if ((TREE_CODE (t) == VAR_DECL
10004 /* A VAR_DECL with a context that is a _TYPE is a static data
10006 && !TYPE_P (CP_DECL_CONTEXT (t))
10007 /* Any other non-local variable must be at namespace scope. */
10008 && !DECL_NAMESPACE_SCOPE_P (t))
10009 || (TREE_CODE (t) == PARM_DECL))
10015 /* Like local_variable_p, but suitable for use as a tree-walking
10019 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
10020 void *data ATTRIBUTE_UNUSED)
10022 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
10024 else if (TYPE_P (*tp))
10025 *walk_subtrees = 0;
10031 /* Check that ARG, which is a default-argument expression for a
10032 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
10033 something goes wrong. DECL may also be a _TYPE node, rather than a
10034 DECL, if there is no DECL available. */
10037 check_default_argument (tree decl, tree arg)
10042 if (TREE_CODE (arg) == DEFAULT_ARG)
10043 /* We get a DEFAULT_ARG when looking at an in-class declaration
10044 with a default argument. Ignore the argument for now; we'll
10045 deal with it after the class is complete. */
10054 decl_type = TREE_TYPE (decl);
10056 if (arg == error_mark_node
10057 || decl == error_mark_node
10058 || TREE_TYPE (arg) == error_mark_node
10059 || decl_type == error_mark_node)
10060 /* Something already went wrong. There's no need to check
10062 return error_mark_node;
10064 /* [dcl.fct.default]
10066 A default argument expression is implicitly converted to the
10068 if (!TREE_TYPE (arg)
10069 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
10072 error ("default argument for %q#D has type %qT",
10073 decl, TREE_TYPE (arg));
10075 error ("default argument for parameter of type %qT has type %qT",
10076 decl_type, TREE_TYPE (arg));
10078 return error_mark_node;
10081 /* [dcl.fct.default]
10083 Local variables shall not be used in default argument
10086 The keyword `this' shall not be used in a default argument of a
10087 member function. */
10088 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
10091 error ("default argument %qE uses local variable %qD", arg, var);
10092 return error_mark_node;
10099 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
10102 type_is_deprecated (tree type)
10104 enum tree_code code;
10105 if (TREE_DEPRECATED (type))
10107 if (TYPE_NAME (type)
10108 && TREE_DEPRECATED (TYPE_NAME (type)))
10111 /* Do warn about using typedefs to a deprecated class. */
10112 if (TAGGED_TYPE_P (type) && type != TYPE_MAIN_VARIANT (type))
10113 return type_is_deprecated (TYPE_MAIN_VARIANT (type));
10115 code = TREE_CODE (type);
10117 if (code == POINTER_TYPE || code == REFERENCE_TYPE
10118 || code == OFFSET_TYPE || code == FUNCTION_TYPE
10119 || code == METHOD_TYPE || code == ARRAY_TYPE)
10120 return type_is_deprecated (TREE_TYPE (type));
10122 if (TYPE_PTRMEMFUNC_P (type))
10123 return type_is_deprecated
10124 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type))));
10129 /* Decode the list of parameter types for a function type.
10130 Given the list of things declared inside the parens,
10131 return a list of types.
10133 If this parameter does not end with an ellipsis, we append
10136 *PARMS is set to the chain of PARM_DECLs created. */
10139 grokparms (tree parmlist, tree *parms)
10141 tree result = NULL_TREE;
10142 tree decls = NULL_TREE;
10146 for (parm = parmlist; parm != NULL_TREE; parm = TREE_CHAIN (parm))
10148 tree type = NULL_TREE;
10149 tree init = TREE_PURPOSE (parm);
10150 tree decl = TREE_VALUE (parm);
10151 const char *errmsg;
10153 if (parm == void_list_node)
10156 if (! decl || TREE_TYPE (decl) == error_mark_node)
10159 type = TREE_TYPE (decl);
10160 if (VOID_TYPE_P (type))
10162 if (same_type_p (type, void_type_node)
10163 && DECL_SELF_REFERENCE_P (type)
10164 && !DECL_NAME (decl) && !result && TREE_CHAIN (parm) == void_list_node)
10165 /* this is a parmlist of `(void)', which is ok. */
10167 cxx_incomplete_type_error (decl, type);
10168 /* It's not a good idea to actually create parameters of
10169 type `void'; other parts of the compiler assume that a
10170 void type terminates the parameter list. */
10171 type = error_mark_node;
10172 TREE_TYPE (decl) = error_mark_node;
10175 if (type != error_mark_node
10176 && TYPE_FOR_JAVA (type)
10177 && MAYBE_CLASS_TYPE_P (type))
10179 error ("parameter %qD has Java class type", decl);
10180 type = error_mark_node;
10181 TREE_TYPE (decl) = error_mark_node;
10185 if (type != error_mark_node
10186 && (errmsg = targetm.invalid_parameter_type (type)))
10189 type = error_mark_node;
10190 TREE_TYPE (decl) = error_mark_node;
10193 if (type != error_mark_node)
10195 if (deprecated_state != DEPRECATED_SUPPRESS)
10197 tree deptype = type_is_deprecated (type);
10199 warn_deprecated_use (deptype, NULL_TREE);
10202 /* Top-level qualifiers on the parameters are
10203 ignored for function types. */
10204 type = cp_build_qualified_type (type, 0);
10205 if (TREE_CODE (type) == METHOD_TYPE)
10207 error ("parameter %qD invalidly declared method type", decl);
10208 type = build_pointer_type (type);
10209 TREE_TYPE (decl) = type;
10211 else if (abstract_virtuals_error (decl, type))
10212 any_error = 1; /* Seems like a good idea. */
10213 else if (POINTER_TYPE_P (type))
10215 /* [dcl.fct]/6, parameter types cannot contain pointers
10216 (references) to arrays of unknown bound. */
10217 tree t = TREE_TYPE (type);
10218 int ptr = TYPE_PTR_P (type);
10222 if (TYPE_PTR_P (t))
10224 else if (TREE_CODE (t) != ARRAY_TYPE)
10226 else if (!TYPE_DOMAIN (t))
10230 if (TREE_CODE (t) == ARRAY_TYPE)
10232 ? G_("parameter %qD includes pointer to array of "
10233 "unknown bound %qT")
10234 : G_("parameter %qD includes reference to array of "
10235 "unknown bound %qT"),
10241 else if (init && !processing_template_decl)
10242 init = check_default_argument (decl, init);
10245 if (TREE_CODE (decl) == PARM_DECL
10246 && FUNCTION_PARAMETER_PACK_P (decl)
10247 && TREE_CHAIN (parm)
10248 && TREE_CHAIN (parm) != void_list_node)
10249 error ("parameter packs must be at the end of the parameter list");
10251 DECL_CHAIN (decl) = decls;
10253 result = tree_cons (init, type, result);
10255 decls = nreverse (decls);
10256 result = nreverse (result);
10258 result = chainon (result, void_list_node);
10265 /* D is a constructor or overloaded `operator='.
10267 Let T be the class in which D is declared. Then, this function
10270 -1 if D's is an ill-formed constructor or copy assignment operator
10271 whose first parameter is of type `T'.
10272 0 if D is not a copy constructor or copy assignment
10274 1 if D is a copy constructor or copy assignment operator whose
10275 first parameter is a reference to non-const qualified T.
10276 2 if D is a copy constructor or copy assignment operator whose
10277 first parameter is a reference to const qualified T.
10279 This function can be used as a predicate. Positive values indicate
10280 a copy constructor and nonzero values indicate a copy assignment
10284 copy_fn_p (const_tree d)
10290 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10292 if (TREE_CODE (d) == TEMPLATE_DECL
10293 || (DECL_TEMPLATE_INFO (d)
10294 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10295 /* Instantiations of template member functions are never copy
10296 functions. Note that member functions of templated classes are
10297 represented as template functions internally, and we must
10298 accept those as copy functions. */
10301 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10305 arg_type = TREE_VALUE (args);
10306 if (arg_type == error_mark_node)
10309 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
10311 /* Pass by value copy assignment operator. */
10314 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
10315 && !TYPE_REF_IS_RVALUE (arg_type)
10316 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
10318 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
10324 args = TREE_CHAIN (args);
10326 if (args && args != void_list_node && !TREE_PURPOSE (args))
10327 /* There are more non-optional args. */
10333 /* D is a constructor or overloaded `operator='.
10335 Let T be the class in which D is declared. Then, this function
10336 returns true when D is a move constructor or move assignment
10337 operator, false otherwise. */
10340 move_fn_p (const_tree d)
10344 bool result = false;
10346 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10348 if (cxx_dialect == cxx98)
10349 /* There are no move constructors if we are in C++98 mode. */
10352 if (TREE_CODE (d) == TEMPLATE_DECL
10353 || (DECL_TEMPLATE_INFO (d)
10354 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10355 /* Instantiations of template member functions are never copy
10356 functions. Note that member functions of templated classes are
10357 represented as template functions internally, and we must
10358 accept those as copy functions. */
10361 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10365 arg_type = TREE_VALUE (args);
10366 if (arg_type == error_mark_node)
10369 if (TREE_CODE (arg_type) == REFERENCE_TYPE
10370 && TYPE_REF_IS_RVALUE (arg_type)
10371 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
10375 args = TREE_CHAIN (args);
10377 if (args && args != void_list_node && !TREE_PURPOSE (args))
10378 /* There are more non-optional args. */
10384 /* Remember any special properties of member function DECL. */
10387 grok_special_member_properties (tree decl)
10391 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
10394 class_type = DECL_CONTEXT (decl);
10395 if (DECL_CONSTRUCTOR_P (decl))
10397 int ctor = copy_fn_p (decl);
10399 if (!DECL_ARTIFICIAL (decl))
10400 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
10406 A non-template constructor for class X is a copy
10407 constructor if its first parameter is of type X&, const
10408 X&, volatile X& or const volatile X&, and either there
10409 are no other parameters or else all other parameters have
10410 default arguments. */
10411 TYPE_HAS_COPY_CTOR (class_type) = 1;
10412 if (user_provided_p (decl))
10413 TYPE_HAS_COMPLEX_COPY_CTOR (class_type) = 1;
10415 TYPE_HAS_CONST_COPY_CTOR (class_type) = 1;
10417 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
10419 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
10420 if (user_provided_p (decl))
10421 TYPE_HAS_COMPLEX_DFLT (class_type) = 1;
10423 else if (move_fn_p (decl) && user_provided_p (decl))
10424 TYPE_HAS_COMPLEX_MOVE_CTOR (class_type) = 1;
10425 else if (is_list_ctor (decl))
10426 TYPE_HAS_LIST_CTOR (class_type) = 1;
10428 if (DECL_DECLARED_CONSTEXPR_P (decl)
10429 && !copy_fn_p (decl) && !move_fn_p (decl))
10430 TYPE_HAS_CONSTEXPR_CTOR (class_type) = 1;
10432 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
10436 A non-template assignment operator for class X is a copy
10437 assignment operator if its parameter is of type X, X&, const
10438 X&, volatile X& or const volatile X&. */
10440 int assop = copy_fn_p (decl);
10444 TYPE_HAS_COPY_ASSIGN (class_type) = 1;
10445 if (user_provided_p (decl))
10446 TYPE_HAS_COMPLEX_COPY_ASSIGN (class_type) = 1;
10448 TYPE_HAS_CONST_COPY_ASSIGN (class_type) = 1;
10450 else if (move_fn_p (decl) && user_provided_p (decl))
10451 TYPE_HAS_COMPLEX_MOVE_ASSIGN (class_type) = 1;
10453 /* Destructors are handled in check_methods. */
10456 /* Check a constructor DECL has the correct form. Complains
10457 if the class has a constructor of the form X(X). */
10460 grok_ctor_properties (const_tree ctype, const_tree decl)
10462 int ctor_parm = copy_fn_p (decl);
10468 A declaration of a constructor for a class X is ill-formed if
10469 its first parameter is of type (optionally cv-qualified) X
10470 and either there are no other parameters or else all other
10471 parameters have default arguments.
10473 We *don't* complain about member template instantiations that
10474 have this form, though; they can occur as we try to decide
10475 what constructor to use during overload resolution. Since
10476 overload resolution will never prefer such a constructor to
10477 the non-template copy constructor (which is either explicitly
10478 or implicitly defined), there's no need to worry about their
10479 existence. Theoretically, they should never even be
10480 instantiated, but that's hard to forestall. */
10481 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
10489 /* An operator with this code is unary, but can also be binary. */
10492 ambi_op_p (enum tree_code code)
10494 return (code == INDIRECT_REF
10495 || code == ADDR_EXPR
10496 || code == UNARY_PLUS_EXPR
10497 || code == NEGATE_EXPR
10498 || code == PREINCREMENT_EXPR
10499 || code == PREDECREMENT_EXPR);
10502 /* An operator with this name can only be unary. */
10505 unary_op_p (enum tree_code code)
10507 return (code == TRUTH_NOT_EXPR
10508 || code == BIT_NOT_EXPR
10509 || code == COMPONENT_REF
10510 || code == TYPE_EXPR);
10513 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
10514 errors are issued for invalid declarations. */
10517 grok_op_properties (tree decl, bool complain)
10519 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
10521 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
10522 tree name = DECL_NAME (decl);
10523 enum tree_code operator_code;
10528 /* Count the number of arguments and check for ellipsis. */
10529 for (argtype = argtypes, arity = 0;
10530 argtype && argtype != void_list_node;
10531 argtype = TREE_CHAIN (argtype))
10533 ellipsis_p = !argtype;
10535 class_type = DECL_CONTEXT (decl);
10536 if (class_type && !CLASS_TYPE_P (class_type))
10537 class_type = NULL_TREE;
10539 if (DECL_CONV_FN_P (decl))
10540 operator_code = TYPE_EXPR;
10544 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
10545 if (ansi_opname (CODE) == name) \
10547 operator_code = (CODE); \
10550 else if (ansi_assopname (CODE) == name) \
10552 operator_code = (CODE); \
10553 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
10557 #include "operators.def"
10558 #undef DEF_OPERATOR
10560 gcc_unreachable ();
10563 gcc_assert (operator_code != MAX_TREE_CODES);
10564 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10567 switch (operator_code)
10570 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
10574 TYPE_GETS_DELETE (class_type) |= 1;
10578 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
10581 case VEC_DELETE_EXPR:
10582 TYPE_GETS_DELETE (class_type) |= 2;
10589 /* [basic.std.dynamic.allocation]/1:
10591 A program is ill-formed if an allocation function is declared
10592 in a namespace scope other than global scope or declared static
10595 The same also holds true for deallocation functions. */
10596 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
10597 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10599 if (DECL_NAMESPACE_SCOPE_P (decl))
10601 if (CP_DECL_CONTEXT (decl) != global_namespace)
10603 error ("%qD may not be declared within a namespace", decl);
10606 else if (!TREE_PUBLIC (decl))
10608 error ("%qD may not be declared as static", decl);
10614 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
10616 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
10617 DECL_IS_OPERATOR_NEW (decl) = 1;
10619 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10620 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
10623 /* An operator function must either be a non-static member function
10624 or have at least one parameter of a class, a reference to a class,
10625 an enumeration, or a reference to an enumeration. 13.4.0.6 */
10626 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
10628 if (operator_code == TYPE_EXPR
10629 || operator_code == CALL_EXPR
10630 || operator_code == COMPONENT_REF
10631 || operator_code == ARRAY_REF
10632 || operator_code == NOP_EXPR)
10634 error ("%qD must be a nonstatic member function", decl);
10641 if (DECL_STATIC_FUNCTION_P (decl))
10643 error ("%qD must be either a non-static member "
10644 "function or a non-member function", decl);
10648 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
10650 tree arg = non_reference (TREE_VALUE (p));
10651 if (arg == error_mark_node)
10654 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
10655 because these checks are performed even on
10656 template functions. */
10657 if (MAYBE_CLASS_TYPE_P (arg)
10658 || TREE_CODE (arg) == ENUMERAL_TYPE)
10662 if (!p || p == void_list_node)
10665 error ("%qD must have an argument of class or "
10666 "enumerated type", decl);
10672 /* There are no restrictions on the arguments to an overloaded
10674 if (operator_code == CALL_EXPR)
10677 /* Warn about conversion operators that will never be used. */
10678 if (IDENTIFIER_TYPENAME_P (name)
10679 && ! DECL_TEMPLATE_INFO (decl)
10681 /* Warn only declaring the function; there is no need to
10682 warn again about out-of-class definitions. */
10683 && class_type == current_class_type)
10685 tree t = TREE_TYPE (name);
10686 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
10689 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
10691 if (TREE_CODE (t) == VOID_TYPE)
10692 warning (OPT_Wconversion,
10694 ? G_("conversion to a reference to void "
10695 "will never use a type conversion operator")
10696 : G_("conversion to void "
10697 "will never use a type conversion operator"));
10698 else if (class_type)
10700 if (t == class_type)
10701 warning (OPT_Wconversion,
10703 ? G_("conversion to a reference to the same type "
10704 "will never use a type conversion operator")
10705 : G_("conversion to the same type "
10706 "will never use a type conversion operator"));
10707 /* Don't force t to be complete here. */
10708 else if (MAYBE_CLASS_TYPE_P (t)
10709 && COMPLETE_TYPE_P (t)
10710 && DERIVED_FROM_P (t, class_type))
10711 warning (OPT_Wconversion,
10713 ? G_("conversion to a reference to a base class "
10714 "will never use a type conversion operator")
10715 : G_("conversion to a base class "
10716 "will never use a type conversion operator"));
10721 if (operator_code == COND_EXPR)
10724 error ("ISO C++ prohibits overloading operator ?:");
10727 else if (ellipsis_p)
10729 error ("%qD must not have variable number of arguments", decl);
10732 else if (ambi_op_p (operator_code))
10735 /* We pick the one-argument operator codes by default, so
10736 we don't have to change anything. */
10738 else if (arity == 2)
10740 /* If we thought this was a unary operator, we now know
10741 it to be a binary operator. */
10742 switch (operator_code)
10745 operator_code = MULT_EXPR;
10749 operator_code = BIT_AND_EXPR;
10752 case UNARY_PLUS_EXPR:
10753 operator_code = PLUS_EXPR;
10757 operator_code = MINUS_EXPR;
10760 case PREINCREMENT_EXPR:
10761 operator_code = POSTINCREMENT_EXPR;
10764 case PREDECREMENT_EXPR:
10765 operator_code = POSTDECREMENT_EXPR;
10769 gcc_unreachable ();
10772 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10774 if ((operator_code == POSTINCREMENT_EXPR
10775 || operator_code == POSTDECREMENT_EXPR)
10776 && ! processing_template_decl
10777 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
10780 error ("postfix %qD must take %<int%> as its argument",
10783 error ("postfix %qD must take %<int%> as its second "
10791 error ("%qD must take either zero or one argument", decl);
10793 error ("%qD must take either one or two arguments", decl);
10797 /* More Effective C++ rule 6. */
10799 && (operator_code == POSTINCREMENT_EXPR
10800 || operator_code == POSTDECREMENT_EXPR
10801 || operator_code == PREINCREMENT_EXPR
10802 || operator_code == PREDECREMENT_EXPR))
10804 tree arg = TREE_VALUE (argtypes);
10805 tree ret = TREE_TYPE (TREE_TYPE (decl));
10806 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
10807 arg = TREE_TYPE (arg);
10808 arg = TYPE_MAIN_VARIANT (arg);
10809 if (operator_code == PREINCREMENT_EXPR
10810 || operator_code == PREDECREMENT_EXPR)
10812 if (TREE_CODE (ret) != REFERENCE_TYPE
10813 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
10815 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
10816 build_reference_type (arg));
10820 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
10821 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
10825 else if (unary_op_p (operator_code))
10830 error ("%qD must take %<void%>", decl);
10832 error ("%qD must take exactly one argument", decl);
10836 else /* if (binary_op_p (operator_code)) */
10841 error ("%qD must take exactly one argument", decl);
10843 error ("%qD must take exactly two arguments", decl);
10847 /* More Effective C++ rule 7. */
10849 && (operator_code == TRUTH_ANDIF_EXPR
10850 || operator_code == TRUTH_ORIF_EXPR
10851 || operator_code == COMPOUND_EXPR))
10852 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
10856 /* Effective C++ rule 23. */
10859 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
10860 && (operator_code == PLUS_EXPR
10861 || operator_code == MINUS_EXPR
10862 || operator_code == TRUNC_DIV_EXPR
10863 || operator_code == MULT_EXPR
10864 || operator_code == TRUNC_MOD_EXPR)
10865 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
10866 warning (OPT_Weffc__, "%qD should return by value", decl);
10868 /* [over.oper]/8 */
10869 for (; argtypes && argtypes != void_list_node;
10870 argtypes = TREE_CHAIN (argtypes))
10871 if (TREE_PURPOSE (argtypes))
10873 TREE_PURPOSE (argtypes) = NULL_TREE;
10874 if (operator_code == POSTINCREMENT_EXPR
10875 || operator_code == POSTDECREMENT_EXPR)
10877 pedwarn (input_location, OPT_pedantic, "%qD cannot have default arguments",
10882 error ("%qD cannot have default arguments", decl);
10890 /* Return a string giving the keyword associate with CODE. */
10892 static const char *
10893 tag_name (enum tag_types code)
10905 case typename_type:
10908 gcc_unreachable ();
10912 /* Name lookup in an elaborated-type-specifier (after the keyword
10913 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
10914 elaborated-type-specifier is invalid, issue a diagnostic and return
10915 error_mark_node; otherwise, return the *_TYPE to which it referred.
10916 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
10919 check_elaborated_type_specifier (enum tag_types tag_code,
10921 bool allow_template_p)
10927 struct S { struct S *p; };
10929 name lookup will find the TYPE_DECL for the implicit "S::S"
10930 typedef. Adjust for that here. */
10931 if (DECL_SELF_REFERENCE_P (decl))
10932 decl = TYPE_NAME (TREE_TYPE (decl));
10934 type = TREE_TYPE (decl);
10936 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
10937 is false for this case as well. */
10938 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
10940 error ("using template type parameter %qT after %qs",
10941 type, tag_name (tag_code));
10942 return error_mark_node;
10946 If the identifier resolves to a typedef-name or a template
10947 type-parameter, the elaborated-type-specifier is ill-formed.
10949 In other words, the only legitimate declaration to use in the
10950 elaborated type specifier is the implicit typedef created when
10951 the type is declared. */
10952 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
10953 && !DECL_SELF_REFERENCE_P (decl)
10954 && tag_code != typename_type)
10956 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
10957 error ("%q+D has a previous declaration here", decl);
10958 return error_mark_node;
10960 else if (TREE_CODE (type) != RECORD_TYPE
10961 && TREE_CODE (type) != UNION_TYPE
10962 && tag_code != enum_type
10963 && tag_code != typename_type)
10965 error ("%qT referred to as %qs", type, tag_name (tag_code));
10966 error ("%q+T has a previous declaration here", type);
10967 return error_mark_node;
10969 else if (TREE_CODE (type) != ENUMERAL_TYPE
10970 && tag_code == enum_type)
10972 error ("%qT referred to as enum", type);
10973 error ("%q+T has a previous declaration here", type);
10974 return error_mark_node;
10976 else if (!allow_template_p
10977 && TREE_CODE (type) == RECORD_TYPE
10978 && CLASSTYPE_IS_TEMPLATE (type))
10980 /* If a class template appears as elaborated type specifier
10981 without a template header such as:
10983 template <class T> class C {};
10984 void f(class C); // No template header here
10986 then the required template argument is missing. */
10987 error ("template argument required for %<%s %T%>",
10988 tag_name (tag_code),
10989 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
10990 return error_mark_node;
10996 /* Lookup NAME in elaborate type specifier in scope according to
10997 SCOPE and issue diagnostics if necessary.
10998 Return *_TYPE node upon success, NULL_TREE when the NAME is not
10999 found, and ERROR_MARK_NODE for type error. */
11002 lookup_and_check_tag (enum tag_types tag_code, tree name,
11003 tag_scope scope, bool template_header_p)
11007 if (scope == ts_global)
11009 /* First try ordinary name lookup, ignoring hidden class name
11010 injected via friend declaration. */
11011 decl = lookup_name_prefer_type (name, 2);
11012 /* If that fails, the name will be placed in the smallest
11013 non-class, non-function-prototype scope according to 3.3.1/5.
11014 We may already have a hidden name declared as friend in this
11015 scope. So lookup again but not ignoring hidden names.
11016 If we find one, that name will be made visible rather than
11017 creating a new tag. */
11019 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
11022 decl = lookup_type_scope (name, scope);
11024 if (decl && DECL_CLASS_TEMPLATE_P (decl))
11025 decl = DECL_TEMPLATE_RESULT (decl);
11027 if (decl && TREE_CODE (decl) == TYPE_DECL)
11029 /* Look for invalid nested type:
11033 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
11035 error ("%qD has the same name as the class in which it is "
11038 return error_mark_node;
11041 /* Two cases we need to consider when deciding if a class
11042 template is allowed as an elaborated type specifier:
11043 1. It is a self reference to its own class.
11044 2. It comes with a template header.
11048 template <class T> class C {
11049 class C *c1; // DECL_SELF_REFERENCE_P is true
11052 template <class U> class C; // template_header_p is true
11053 template <class T> class C<T>::D {
11054 class C *c2; // DECL_SELF_REFERENCE_P is true
11057 t = check_elaborated_type_specifier (tag_code,
11060 | DECL_SELF_REFERENCE_P (decl));
11063 else if (decl && TREE_CODE (decl) == TREE_LIST)
11065 error ("reference to %qD is ambiguous", name);
11066 print_candidates (decl);
11067 return error_mark_node;
11073 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
11074 Define the tag as a forward-reference if it is not defined.
11076 If a declaration is given, process it here, and report an error if
11077 multiple declarations are not identical.
11079 SCOPE is TS_CURRENT when this is also a definition. Only look in
11080 the current frame for the name (since C++ allows new names in any
11081 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
11082 declaration. Only look beginning from the current scope outward up
11083 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
11085 TEMPLATE_HEADER_P is true when this declaration is preceded by
11086 a set of template parameters. */
11089 xref_tag (enum tag_types tag_code, tree name,
11090 tag_scope scope, bool template_header_p)
11092 enum tree_code code;
11094 tree context = NULL_TREE;
11096 timevar_push (TV_NAME_LOOKUP);
11098 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11104 code = RECORD_TYPE;
11110 code = ENUMERAL_TYPE;
11113 gcc_unreachable ();
11116 /* In case of anonymous name, xref_tag is only called to
11117 make type node and push name. Name lookup is not required. */
11118 if (ANON_AGGRNAME_P (name))
11121 t = lookup_and_check_tag (tag_code, name,
11122 scope, template_header_p);
11124 if (t == error_mark_node)
11125 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
11127 if (scope != ts_current && t && current_class_type
11128 && template_class_depth (current_class_type)
11129 && template_header_p)
11131 /* Since SCOPE is not TS_CURRENT, we are not looking at a
11132 definition of this tag. Since, in addition, we are currently
11133 processing a (member) template declaration of a template
11134 class, we must be very careful; consider:
11141 { template <class V>
11142 friend struct S1; };
11144 Here, the S2::S1 declaration should not be confused with the
11145 outer declaration. In particular, the inner version should
11146 have a template parameter of level 2, not level 1. This
11147 would be particularly important if the member declaration
11150 template <class V = U> friend struct S1;
11152 say, when we should tsubst into `U' when instantiating
11153 S2. On the other hand, when presented with:
11163 we must find the inner binding eventually. We
11164 accomplish this by making sure that the new type we
11165 create to represent this declaration has the right
11167 context = TYPE_CONTEXT (t);
11173 /* If no such tag is yet defined, create a forward-reference node
11174 and record it as the "definition".
11175 When a real declaration of this type is found,
11176 the forward-reference will be altered into a real type. */
11177 if (code == ENUMERAL_TYPE)
11179 error ("use of enum %q#D without previous declaration", name);
11180 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
11184 t = make_class_type (code);
11185 TYPE_CONTEXT (t) = context;
11186 t = pushtag (name, t, scope);
11191 if (template_header_p && MAYBE_CLASS_TYPE_P (t))
11193 if (!redeclare_class_template (t, current_template_parms))
11194 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
11196 else if (!processing_template_decl
11197 && CLASS_TYPE_P (t)
11198 && CLASSTYPE_IS_TEMPLATE (t))
11200 error ("redeclaration of %qT as a non-template", t);
11201 error ("previous declaration %q+D", t);
11202 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
11205 /* Make injected friend class visible. */
11206 if (scope != ts_within_enclosing_non_class
11207 && hidden_name_p (TYPE_NAME (t)))
11209 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
11210 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
11212 if (TYPE_TEMPLATE_INFO (t))
11214 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
11215 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
11220 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t);
11224 xref_tag_from_type (tree old, tree id, tag_scope scope)
11226 enum tag_types tag_kind;
11228 if (TREE_CODE (old) == RECORD_TYPE)
11229 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
11231 tag_kind = union_type;
11233 if (id == NULL_TREE)
11234 id = TYPE_IDENTIFIER (old);
11236 return xref_tag (tag_kind, id, scope, false);
11239 /* Create the binfo hierarchy for REF with (possibly NULL) base list
11240 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
11241 access_* node, and the TREE_VALUE is the type of the base-class.
11242 Non-NULL TREE_TYPE indicates virtual inheritance.
11244 Returns true if the binfo hierarchy was successfully created,
11245 false if an error was detected. */
11248 xref_basetypes (tree ref, tree base_list)
11251 tree binfo, base_binfo;
11252 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
11253 unsigned max_bases = 0; /* Maximum direct bases. */
11255 tree default_access;
11256 tree igo_prev; /* Track Inheritance Graph Order. */
11258 if (ref == error_mark_node)
11261 /* The base of a derived class is private by default, all others are
11263 default_access = (TREE_CODE (ref) == RECORD_TYPE
11264 && CLASSTYPE_DECLARED_CLASS (ref)
11265 ? access_private_node : access_public_node);
11267 /* First, make sure that any templates in base-classes are
11268 instantiated. This ensures that if we call ourselves recursively
11269 we do not get confused about which classes are marked and which
11271 basep = &base_list;
11274 tree basetype = TREE_VALUE (*basep);
11276 if (!(processing_template_decl && uses_template_parms (basetype))
11277 && !complete_type_or_else (basetype, NULL))
11278 /* An incomplete type. Remove it from the list. */
11279 *basep = TREE_CHAIN (*basep);
11283 if (TREE_TYPE (*basep))
11285 if (CLASS_TYPE_P (basetype))
11286 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
11287 basep = &TREE_CHAIN (*basep);
11291 TYPE_MARKED_P (ref) = 1;
11293 /* The binfo slot should be empty, unless this is an (ill-formed)
11295 if (TYPE_BINFO (ref) && !TYPE_SIZE (ref))
11297 error ("redefinition of %q#T", ref);
11301 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
11303 binfo = make_tree_binfo (max_bases);
11305 TYPE_BINFO (ref) = binfo;
11306 BINFO_OFFSET (binfo) = size_zero_node;
11307 BINFO_TYPE (binfo) = ref;
11309 /* Apply base-class info set up to the variants of this type. */
11310 fixup_type_variants (ref);
11314 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
11315 /* An aggregate cannot have baseclasses. */
11316 CLASSTYPE_NON_AGGREGATE (ref) = 1;
11318 if (TREE_CODE (ref) == UNION_TYPE)
11320 error ("derived union %qT invalid", ref);
11327 if (TYPE_FOR_JAVA (ref))
11329 error ("Java class %qT cannot have multiple bases", ref);
11336 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
11338 if (TYPE_FOR_JAVA (ref))
11340 error ("Java class %qT cannot have virtual bases", ref);
11345 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
11347 tree access = TREE_PURPOSE (base_list);
11348 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
11349 tree basetype = TREE_VALUE (base_list);
11351 if (access == access_default_node)
11352 access = default_access;
11354 if (PACK_EXPANSION_P (basetype))
11355 basetype = PACK_EXPANSION_PATTERN (basetype);
11356 if (TREE_CODE (basetype) == TYPE_DECL)
11357 basetype = TREE_TYPE (basetype);
11358 if (!MAYBE_CLASS_TYPE_P (basetype) || TREE_CODE (basetype) == UNION_TYPE)
11360 error ("base type %qT fails to be a struct or class type",
11365 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
11366 TYPE_FOR_JAVA (ref) = 1;
11368 base_binfo = NULL_TREE;
11369 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
11371 base_binfo = TYPE_BINFO (basetype);
11372 /* The original basetype could have been a typedef'd type. */
11373 basetype = BINFO_TYPE (base_binfo);
11375 /* Inherit flags from the base. */
11376 TYPE_HAS_NEW_OPERATOR (ref)
11377 |= TYPE_HAS_NEW_OPERATOR (basetype);
11378 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
11379 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
11380 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
11381 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
11382 CLASSTYPE_DIAMOND_SHAPED_P (ref)
11383 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
11384 CLASSTYPE_REPEATED_BASE_P (ref)
11385 |= CLASSTYPE_REPEATED_BASE_P (basetype);
11388 /* We must do this test after we've seen through a typedef
11390 if (TYPE_MARKED_P (basetype))
11392 if (basetype == ref)
11393 error ("recursive type %qT undefined", basetype);
11395 error ("duplicate base type %qT invalid", basetype);
11399 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
11400 /* Regenerate the pack expansion for the bases. */
11401 basetype = make_pack_expansion (basetype);
11403 TYPE_MARKED_P (basetype) = 1;
11405 base_binfo = copy_binfo (base_binfo, basetype, ref,
11406 &igo_prev, via_virtual);
11407 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
11408 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
11410 BINFO_BASE_APPEND (binfo, base_binfo);
11411 BINFO_BASE_ACCESS_APPEND (binfo, access);
11414 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
11415 /* If we have space in the vbase vector, we must have shared at
11416 least one of them, and are therefore diamond shaped. */
11417 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
11419 /* Unmark all the types. */
11420 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
11421 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11422 TYPE_MARKED_P (ref) = 0;
11424 /* Now see if we have a repeated base type. */
11425 if (!CLASSTYPE_REPEATED_BASE_P (ref))
11427 for (base_binfo = binfo; base_binfo;
11428 base_binfo = TREE_CHAIN (base_binfo))
11430 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11432 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
11435 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
11437 for (base_binfo = binfo; base_binfo;
11438 base_binfo = TREE_CHAIN (base_binfo))
11439 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11440 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11449 /* Copies the enum-related properties from type SRC to type DST.
11450 Used with the underlying type of an enum and the enum itself. */
11452 copy_type_enum (tree dst, tree src)
11454 TYPE_MIN_VALUE (dst) = TYPE_MIN_VALUE (src);
11455 TYPE_MAX_VALUE (dst) = TYPE_MAX_VALUE (src);
11456 TYPE_SIZE (dst) = TYPE_SIZE (src);
11457 TYPE_SIZE_UNIT (dst) = TYPE_SIZE_UNIT (src);
11458 SET_TYPE_MODE (dst, TYPE_MODE (src));
11459 TYPE_PRECISION (dst) = TYPE_PRECISION (src);
11460 TYPE_ALIGN (dst) = TYPE_ALIGN (src);
11461 TYPE_USER_ALIGN (dst) = TYPE_USER_ALIGN (src);
11462 TYPE_UNSIGNED (dst) = TYPE_UNSIGNED (src);
11465 /* Begin compiling the definition of an enumeration type.
11468 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
11470 UNDERLYING_TYPE is the type that will be used as the storage for
11471 the enumeration type. This should be NULL_TREE if no storage type
11474 SCOPED_ENUM_P is true if this is a scoped enumeration type.
11476 if IS_NEW is not NULL, gets TRUE iff a new type is created.
11478 Returns the type object, as yet incomplete.
11479 Also records info about it so that build_enumerator
11480 may be used to declare the individual values as they are read. */
11483 start_enum (tree name, tree enumtype, tree underlying_type,
11484 bool scoped_enum_p, bool *is_new)
11486 tree prevtype = NULL_TREE;
11487 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11491 /* [C++0x dcl.enum]p5:
11493 If not explicitly specified, the underlying type of a scoped
11494 enumeration type is int. */
11495 if (!underlying_type && scoped_enum_p)
11496 underlying_type = integer_type_node;
11498 if (underlying_type)
11499 underlying_type = cv_unqualified (underlying_type);
11501 /* If this is the real definition for a previous forward reference,
11502 fill in the contents in the same object that used to be the
11503 forward reference. */
11505 enumtype = lookup_and_check_tag (enum_type, name,
11506 /*tag_scope=*/ts_current,
11507 /*template_header_p=*/false);
11509 /* In case of a template_decl, the only check that should be deferred
11510 to instantiation time is the comparison of underlying types. */
11511 if (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE)
11513 if (scoped_enum_p != SCOPED_ENUM_P (enumtype))
11515 error_at (input_location, "scoped/unscoped mismatch "
11516 "in enum %q#T", enumtype);
11517 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11518 "previous definition here");
11519 enumtype = error_mark_node;
11521 else if (ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) != !! underlying_type)
11523 error_at (input_location, "underlying type mismatch "
11524 "in enum %q#T", enumtype);
11525 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11526 "previous definition here");
11527 enumtype = error_mark_node;
11529 else if (underlying_type && ENUM_UNDERLYING_TYPE (enumtype)
11530 && !dependent_type_p (underlying_type)
11531 && !dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype))
11532 && !same_type_p (underlying_type,
11533 ENUM_UNDERLYING_TYPE (enumtype)))
11535 error_at (input_location, "different underlying type "
11536 "in enum %q#T", enumtype);
11537 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11538 "previous definition here");
11539 underlying_type = NULL_TREE;
11543 if (!enumtype || TREE_CODE (enumtype) != ENUMERAL_TYPE
11544 || processing_template_decl)
11546 /* In case of error, make a dummy enum to allow parsing to
11548 if (enumtype == error_mark_node)
11550 name = make_anon_name ();
11551 enumtype = NULL_TREE;
11554 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
11555 of an opaque enum, or an opaque enum of an already defined
11556 enumeration (C++0x only).
11557 In any other case, it'll be NULL_TREE. */
11563 prevtype = enumtype;
11564 enumtype = cxx_make_type (ENUMERAL_TYPE);
11565 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
11566 if (enumtype == error_mark_node)
11567 return error_mark_node;
11569 /* The enum is considered opaque until the opening '{' of the
11570 enumerator list. */
11571 SET_OPAQUE_ENUM_P (enumtype, true);
11572 ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) = !! underlying_type;
11575 SET_SCOPED_ENUM_P (enumtype, scoped_enum_p);
11577 if (underlying_type)
11579 if (CP_INTEGRAL_TYPE_P (underlying_type))
11581 copy_type_enum (enumtype, underlying_type);
11582 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
11584 else if (dependent_type_p (underlying_type))
11585 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
11587 error ("underlying type %<%T%> of %<%T%> must be an integral type",
11588 underlying_type, enumtype);
11591 /* If into a template class, the returned enum is always the first
11592 declaration (opaque or not) seen. This way all the references to
11593 this type will be to the same declaration. The following ones are used
11594 only to check for definition errors. */
11595 if (prevtype && processing_template_decl)
11601 /* After processing and defining all the values of an enumeration type,
11602 install their decls in the enumeration type.
11603 ENUMTYPE is the type object. */
11606 finish_enum_value_list (tree enumtype)
11609 tree underlying_type;
11612 tree minnode, maxnode;
11615 bool fixed_underlying_type_p
11616 = ENUM_UNDERLYING_TYPE (enumtype) != NULL_TREE;
11618 /* We built up the VALUES in reverse order. */
11619 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
11621 /* For an enum defined in a template, just set the type of the values;
11622 all further processing is postponed until the template is
11623 instantiated. We need to set the type so that tsubst of a CONST_DECL
11625 if (processing_template_decl)
11627 for (values = TYPE_VALUES (enumtype);
11629 values = TREE_CHAIN (values))
11630 TREE_TYPE (TREE_VALUE (values)) = enumtype;
11634 /* Determine the minimum and maximum values of the enumerators. */
11635 if (TYPE_VALUES (enumtype))
11637 minnode = maxnode = NULL_TREE;
11639 for (values = TYPE_VALUES (enumtype);
11641 values = TREE_CHAIN (values))
11643 decl = TREE_VALUE (values);
11645 /* [dcl.enum]: Following the closing brace of an enum-specifier,
11646 each enumerator has the type of its enumeration. Prior to the
11647 closing brace, the type of each enumerator is the type of its
11648 initializing value. */
11649 TREE_TYPE (decl) = enumtype;
11651 /* Update the minimum and maximum values, if appropriate. */
11652 value = DECL_INITIAL (decl);
11653 if (value == error_mark_node)
11654 value = integer_zero_node;
11655 /* Figure out what the minimum and maximum values of the
11656 enumerators are. */
11658 minnode = maxnode = value;
11659 else if (tree_int_cst_lt (maxnode, value))
11661 else if (tree_int_cst_lt (value, minnode))
11668 If the enumerator-list is empty, the underlying type is as if
11669 the enumeration had a single enumerator with value 0. */
11670 minnode = maxnode = integer_zero_node;
11672 if (!fixed_underlying_type_p)
11674 /* Compute the number of bits require to represent all values of the
11675 enumeration. We must do this before the type of MINNODE and
11676 MAXNODE are transformed, since tree_int_cst_min_precision relies
11677 on the TREE_TYPE of the value it is passed. */
11678 bool unsignedp = tree_int_cst_sgn (minnode) >= 0;
11679 int lowprec = tree_int_cst_min_precision (minnode, unsignedp);
11680 int highprec = tree_int_cst_min_precision (maxnode, unsignedp);
11681 int precision = MAX (lowprec, highprec);
11683 bool use_short_enum;
11685 /* Determine the underlying type of the enumeration.
11689 The underlying type of an enumeration is an integral type that
11690 can represent all the enumerator values defined in the
11691 enumeration. It is implementation-defined which integral type is
11692 used as the underlying type for an enumeration except that the
11693 underlying type shall not be larger than int unless the value of
11694 an enumerator cannot fit in an int or unsigned int.
11696 We use "int" or an "unsigned int" as the underlying type, even if
11697 a smaller integral type would work, unless the user has
11698 explicitly requested that we use the smallest possible type. The
11699 user can request that for all enumerations with a command line
11700 flag, or for just one enumeration with an attribute. */
11702 use_short_enum = flag_short_enums
11703 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
11705 for (itk = (use_short_enum ? itk_char : itk_int);
11709 underlying_type = integer_types[itk];
11710 if (underlying_type != NULL_TREE
11711 && TYPE_PRECISION (underlying_type) >= precision
11712 && TYPE_UNSIGNED (underlying_type) == unsignedp)
11715 if (itk == itk_none)
11719 IF no integral type can represent all the enumerator values, the
11720 enumeration is ill-formed. */
11721 error ("no integral type can represent all of the enumerator values "
11722 "for %qT", enumtype);
11723 precision = TYPE_PRECISION (long_long_integer_type_node);
11724 underlying_type = integer_types[itk_unsigned_long_long];
11729 The value of sizeof() applied to an enumeration type, an object
11730 of an enumeration type, or an enumerator, is the value of sizeof()
11731 applied to the underlying type. */
11732 copy_type_enum (enumtype, underlying_type);
11734 /* Compute the minimum and maximum values for the type.
11738 For an enumeration where emin is the smallest enumerator and emax
11739 is the largest, the values of the enumeration are the values of the
11740 underlying type in the range bmin to bmax, where bmin and bmax are,
11741 respectively, the smallest and largest values of the smallest bit-
11742 field that can store emin and emax. */
11744 /* The middle-end currently assumes that types with TYPE_PRECISION
11745 narrower than their underlying type are suitably zero or sign
11746 extended to fill their mode. Similarly, it assumes that the front
11747 end assures that a value of a particular type must be within
11748 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
11750 We used to set these fields based on bmin and bmax, but that led
11751 to invalid assumptions like optimizing away bounds checking. So
11752 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
11753 TYPE_MAX_VALUE to the values for the mode above and only restrict
11754 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
11755 ENUM_UNDERLYING_TYPE (enumtype)
11756 = build_distinct_type_copy (underlying_type);
11757 TYPE_PRECISION (ENUM_UNDERLYING_TYPE (enumtype)) = precision;
11758 set_min_and_max_values_for_integral_type
11759 (ENUM_UNDERLYING_TYPE (enumtype), precision, unsignedp);
11761 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
11762 if (flag_strict_enums)
11763 set_min_and_max_values_for_integral_type (enumtype, precision,
11767 underlying_type = ENUM_UNDERLYING_TYPE (enumtype);
11769 /* Convert each of the enumerators to the type of the underlying
11770 type of the enumeration. */
11771 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
11773 location_t saved_location;
11775 decl = TREE_VALUE (values);
11776 saved_location = input_location;
11777 input_location = DECL_SOURCE_LOCATION (decl);
11778 if (fixed_underlying_type_p)
11779 /* If the enumeration type has a fixed underlying type, we
11780 already checked all of the enumerator values. */
11781 value = DECL_INITIAL (decl);
11783 value = perform_implicit_conversion (underlying_type,
11784 DECL_INITIAL (decl),
11785 tf_warning_or_error);
11786 input_location = saved_location;
11788 /* Do not clobber shared ints. */
11789 value = copy_node (value);
11791 TREE_TYPE (value) = enumtype;
11792 DECL_INITIAL (decl) = value;
11795 /* Fix up all variant types of this enum type. */
11796 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
11797 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
11799 /* Finish debugging output for this type. */
11800 rest_of_type_compilation (enumtype, namespace_bindings_p ());
11803 /* Finishes the enum type. This is called only the first time an
11804 enumeration is seen, be it opaque or odinary.
11805 ENUMTYPE is the type object. */
11808 finish_enum (tree enumtype)
11810 if (processing_template_decl)
11812 if (at_function_scope_p ())
11813 add_stmt (build_min (TAG_DEFN, enumtype));
11817 /* Here there should not be any variants of this type. */
11818 gcc_assert (enumtype == TYPE_MAIN_VARIANT (enumtype)
11819 && !TYPE_NEXT_VARIANT (enumtype));
11822 /* Build and install a CONST_DECL for an enumeration constant of the
11823 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
11824 LOC is the location of NAME.
11825 Assignment of sequential values by default is handled here. */
11828 build_enumerator (tree name, tree value, tree enumtype, location_t loc)
11834 /* If the VALUE was erroneous, pretend it wasn't there; that will
11835 result in the enum being assigned the next value in sequence. */
11836 if (value == error_mark_node)
11839 /* Remove no-op casts from the value. */
11841 STRIP_TYPE_NOPS (value);
11843 if (! processing_template_decl)
11845 /* Validate and default VALUE. */
11846 if (value != NULL_TREE)
11848 value = cxx_constant_value (value);
11850 if (TREE_CODE (value) == INTEGER_CST)
11852 value = perform_integral_promotions (value);
11856 error ("enumerator value for %qD is not an integer constant", name);
11861 /* Default based on previous value. */
11862 if (value == NULL_TREE)
11864 if (TYPE_VALUES (enumtype))
11867 unsigned HOST_WIDE_INT lo;
11871 /* The next value is the previous value plus one.
11872 add_double doesn't know the type of the target expression,
11873 so we must check with int_fits_type_p as well. */
11874 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
11875 if (error_operand_p (prev_value))
11876 value = error_mark_node;
11879 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
11880 TREE_INT_CST_HIGH (prev_value),
11882 value = build_int_cst_wide (TREE_TYPE (prev_value), lo, hi);
11884 |= !int_fits_type_p (value, TREE_TYPE (prev_value));
11888 error ("overflow in enumeration values at %qD", name);
11889 value = error_mark_node;
11894 value = integer_zero_node;
11897 /* Remove no-op casts from the value. */
11898 STRIP_TYPE_NOPS (value);
11900 /* If the underlying type of the enum is fixed, check whether
11901 the enumerator values fits in the underlying type. If it
11902 does not fit, the program is ill-formed [C++0x dcl.enum]. */
11903 if (ENUM_UNDERLYING_TYPE (enumtype)
11905 && TREE_CODE (value) == INTEGER_CST
11906 && !int_fits_type_p (value, ENUM_UNDERLYING_TYPE (enumtype)))
11908 error ("enumerator value %E is too large for underlying type %<%T%>",
11909 value, ENUM_UNDERLYING_TYPE (enumtype));
11911 /* Silently convert the value so that we can continue. */
11912 value = perform_implicit_conversion (ENUM_UNDERLYING_TYPE (enumtype),
11917 /* C++ associates enums with global, function, or class declarations. */
11918 context = current_scope ();
11920 /* Build the actual enumeration constant. Note that the enumeration
11921 constants have the underlying type of the enum (if it is fixed)
11922 or the type of their initializer (if the underlying type of the
11923 enum is not fixed):
11927 If the underlying type is fixed, the type of each enumerator
11928 prior to the closing brace is the underlying type; if the
11929 initializing value of an enumerator cannot be represented by
11930 the underlying type, the program is ill-formed. If the
11931 underlying type is not fixed, the type of each enumerator is
11932 the type of its initializing value.
11934 If the underlying type is not fixed, it will be computed by
11935 finish_enum and we will reset the type of this enumerator. Of
11936 course, if we're processing a template, there may be no value. */
11937 type = value ? TREE_TYPE (value) : NULL_TREE;
11939 if (context && context == current_class_type)
11940 /* This enum declaration is local to the class. We need the full
11941 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
11942 decl = build_lang_decl_loc (loc, CONST_DECL, name, type);
11944 /* It's a global enum, or it's local to a function. (Note local to
11945 a function could mean local to a class method. */
11946 decl = build_decl (loc, CONST_DECL, name, type);
11948 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
11949 TREE_CONSTANT (decl) = 1;
11950 TREE_READONLY (decl) = 1;
11951 DECL_INITIAL (decl) = value;
11953 if (context && context == current_class_type && !SCOPED_ENUM_P (enumtype))
11954 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
11955 on the TYPE_FIELDS list for `S'. (That's so that you can say
11956 things like `S::i' later.) */
11957 finish_member_declaration (decl);
11961 /* Add this enumeration constant to the list for this type. */
11962 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
11965 /* Look for an enumerator with the given NAME within the enumeration
11966 type ENUMTYPE. This routine is used primarily for qualified name
11967 lookup into an enumerator in C++0x, e.g.,
11969 enum class Color { Red, Green, Blue };
11971 Color color = Color::Red;
11973 Returns the value corresponding to the enumerator, or
11974 NULL_TREE if no such enumerator was found. */
11976 lookup_enumerator (tree enumtype, tree name)
11979 gcc_assert (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE);
11981 e = purpose_member (name, TYPE_VALUES (enumtype));
11982 return e? TREE_VALUE (e) : NULL_TREE;
11986 /* We're defining DECL. Make sure that its type is OK. */
11989 check_function_type (tree decl, tree current_function_parms)
11991 tree fntype = TREE_TYPE (decl);
11992 tree return_type = complete_type (TREE_TYPE (fntype));
11994 /* In a function definition, arg types must be complete. */
11995 require_complete_types_for_parms (current_function_parms);
11997 if (dependent_type_p (return_type))
11999 if (!COMPLETE_OR_VOID_TYPE_P (return_type)
12000 || (TYPE_FOR_JAVA (return_type) && MAYBE_CLASS_TYPE_P (return_type)))
12002 tree args = TYPE_ARG_TYPES (fntype);
12004 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
12005 error ("return type %q#T is incomplete", return_type);
12007 error ("return type has Java class type %q#T", return_type);
12009 /* Make it return void instead. */
12010 if (TREE_CODE (fntype) == METHOD_TYPE)
12011 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
12013 TREE_CHAIN (args));
12015 fntype = build_function_type (void_type_node, args);
12017 = build_exception_variant (fntype,
12018 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
12019 fntype = (cp_build_type_attribute_variant
12020 (fntype, TYPE_ATTRIBUTES (TREE_TYPE (decl))));
12021 TREE_TYPE (decl) = fntype;
12024 abstract_virtuals_error (decl, TREE_TYPE (fntype));
12027 /* Create the FUNCTION_DECL for a function definition.
12028 DECLSPECS and DECLARATOR are the parts of the declaration;
12029 they describe the function's name and the type it returns,
12030 but twisted together in a fashion that parallels the syntax of C.
12032 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
12033 DECLARATOR is really the DECL for the function we are about to
12034 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
12035 indicating that the function is an inline defined in-class.
12037 This function creates a binding context for the function body
12038 as well as setting up the FUNCTION_DECL in current_function_decl.
12040 For C++, we must first check whether that datum makes any sense.
12041 For example, "class A local_a(1,2);" means that variable local_a
12042 is an aggregate of type A, which should have a constructor
12043 applied to it with the argument list [1, 2].
12045 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
12046 or may be a BLOCK if the function has been defined previously
12047 in this translation unit. On exit, DECL_INITIAL (decl1) will be
12048 error_mark_node if the function has never been defined, or
12049 a BLOCK if the function has been defined somewhere. */
12052 start_preparsed_function (tree decl1, tree attrs, int flags)
12054 tree ctype = NULL_TREE;
12057 int doing_friend = 0;
12058 struct cp_binding_level *bl;
12059 tree current_function_parms;
12060 struct c_fileinfo *finfo
12061 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
12062 bool honor_interface;
12064 /* Sanity check. */
12065 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
12066 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
12068 fntype = TREE_TYPE (decl1);
12069 if (TREE_CODE (fntype) == METHOD_TYPE)
12070 ctype = TYPE_METHOD_BASETYPE (fntype);
12072 /* ISO C++ 11.4/5. A friend function defined in a class is in
12073 the (lexical) scope of the class in which it is defined. */
12074 if (!ctype && DECL_FRIEND_P (decl1))
12076 ctype = DECL_FRIEND_CONTEXT (decl1);
12078 /* CTYPE could be null here if we're dealing with a template;
12079 for example, `inline friend float foo()' inside a template
12080 will have no CTYPE set. */
12081 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
12087 if (DECL_DECLARED_INLINE_P (decl1)
12088 && lookup_attribute ("noinline", attrs))
12089 warning (0, "inline function %q+D given attribute noinline", decl1);
12091 /* Handle gnu_inline attribute. */
12092 if (GNU_INLINE_P (decl1))
12094 DECL_EXTERNAL (decl1) = 1;
12095 DECL_NOT_REALLY_EXTERN (decl1) = 0;
12096 DECL_INTERFACE_KNOWN (decl1) = 1;
12097 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
12100 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
12101 /* This is a constructor, we must ensure that any default args
12102 introduced by this definition are propagated to the clones
12103 now. The clones are used directly in overload resolution. */
12104 adjust_clone_args (decl1);
12106 /* Sometimes we don't notice that a function is a static member, and
12107 build a METHOD_TYPE for it. Fix that up now. */
12108 if (ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
12109 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE)
12111 revert_static_member_fn (decl1);
12115 /* Set up current_class_type, and enter the scope of the class, if
12118 push_nested_class (ctype);
12119 else if (DECL_STATIC_FUNCTION_P (decl1))
12120 push_nested_class (DECL_CONTEXT (decl1));
12122 /* Now that we have entered the scope of the class, we must restore
12123 the bindings for any template parameters surrounding DECL1, if it
12124 is an inline member template. (Order is important; consider the
12125 case where a template parameter has the same name as a field of
12126 the class.) It is not until after this point that
12127 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
12128 if (flags & SF_INCLASS_INLINE)
12129 maybe_begin_member_template_processing (decl1);
12131 /* Effective C++ rule 15. */
12133 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
12134 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
12135 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
12137 /* Make the init_value nonzero so pushdecl knows this is not tentative.
12138 error_mark_node is replaced below (in poplevel) with the BLOCK. */
12139 if (!DECL_INITIAL (decl1))
12140 DECL_INITIAL (decl1) = error_mark_node;
12142 /* This function exists in static storage.
12143 (This does not mean `static' in the C sense!) */
12144 TREE_STATIC (decl1) = 1;
12146 /* We must call push_template_decl after current_class_type is set
12147 up. (If we are processing inline definitions after exiting a
12148 class scope, current_class_type will be NULL_TREE until set above
12149 by push_nested_class.) */
12150 if (processing_template_decl)
12152 /* FIXME: Handle error_mark_node more gracefully. */
12153 tree newdecl1 = push_template_decl (decl1);
12154 if (newdecl1 != error_mark_node)
12158 /* We are now in the scope of the function being defined. */
12159 current_function_decl = decl1;
12161 /* Save the parm names or decls from this function's declarator
12162 where store_parm_decls will find them. */
12163 current_function_parms = DECL_ARGUMENTS (decl1);
12165 /* Make sure the parameter and return types are reasonable. When
12166 you declare a function, these types can be incomplete, but they
12167 must be complete when you define the function. */
12168 check_function_type (decl1, current_function_parms);
12170 /* Build the return declaration for the function. */
12171 restype = TREE_TYPE (fntype);
12172 if (DECL_RESULT (decl1) == NULL_TREE)
12176 resdecl = build_decl (input_location, RESULT_DECL, 0, restype);
12177 DECL_ARTIFICIAL (resdecl) = 1;
12178 DECL_IGNORED_P (resdecl) = 1;
12179 DECL_RESULT (decl1) = resdecl;
12181 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
12184 /* Let the user know we're compiling this function. */
12185 announce_function (decl1);
12187 /* Record the decl so that the function name is defined.
12188 If we already have a decl for this name, and it is a FUNCTION_DECL,
12189 use the old decl. */
12190 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
12192 /* A specialization is not used to guide overload resolution. */
12193 if (!DECL_FUNCTION_MEMBER_P (decl1)
12194 && !(DECL_USE_TEMPLATE (decl1) &&
12195 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
12197 tree olddecl = pushdecl (decl1);
12199 if (olddecl == error_mark_node)
12200 /* If something went wrong when registering the declaration,
12201 use DECL1; we have to have a FUNCTION_DECL to use when
12202 parsing the body of the function. */
12206 /* Otherwise, OLDDECL is either a previous declaration
12207 of the same function or DECL1 itself. */
12209 if (warn_missing_declarations
12210 && olddecl == decl1
12211 && !DECL_MAIN_P (decl1)
12212 && TREE_PUBLIC (decl1)
12213 && !DECL_DECLARED_INLINE_P (decl1))
12217 /* Check whether DECL1 is in an anonymous
12219 for (context = DECL_CONTEXT (decl1);
12221 context = DECL_CONTEXT (context))
12223 if (TREE_CODE (context) == NAMESPACE_DECL
12224 && DECL_NAME (context) == NULL_TREE)
12228 if (context == NULL)
12229 warning (OPT_Wmissing_declarations,
12230 "no previous declaration for %q+D", decl1);
12238 /* We need to set the DECL_CONTEXT. */
12239 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
12240 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
12242 fntype = TREE_TYPE (decl1);
12244 /* If #pragma weak applies, mark the decl appropriately now.
12245 The pragma only applies to global functions. Because
12246 determining whether or not the #pragma applies involves
12247 computing the mangled name for the declaration, we cannot
12248 apply the pragma until after we have merged this declaration
12249 with any previous declarations; if the original declaration
12250 has a linkage specification, that specification applies to
12251 the definition as well, and may affect the mangled name. */
12252 if (DECL_FILE_SCOPE_P (decl1))
12253 maybe_apply_pragma_weak (decl1);
12256 /* constexpr functions must have literal argument types and
12257 literal return type. */
12258 validate_constexpr_fundecl (decl1);
12260 /* Reset this in case the call to pushdecl changed it. */
12261 current_function_decl = decl1;
12263 gcc_assert (DECL_INITIAL (decl1));
12265 /* This function may already have been parsed, in which case just
12266 return; our caller will skip over the body without parsing. */
12267 if (DECL_INITIAL (decl1) != error_mark_node)
12270 /* Initialize RTL machinery. We cannot do this until
12271 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
12272 even when processing a template; this is how we get
12273 CFUN set up, and our per-function variables initialized.
12274 FIXME factor out the non-RTL stuff. */
12275 bl = current_binding_level;
12276 allocate_struct_function (decl1, processing_template_decl);
12278 /* Initialize the language data structures. Whenever we start
12279 a new function, we destroy temporaries in the usual way. */
12280 cfun->language = ggc_alloc_cleared_language_function ();
12281 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
12282 current_binding_level = bl;
12284 /* Even though we're inside a function body, we still don't want to
12285 call expand_expr to calculate the size of a variable-sized array.
12286 We haven't necessarily assigned RTL to all variables yet, so it's
12287 not safe to try to expand expressions involving them. */
12288 cfun->dont_save_pending_sizes_p = 1;
12290 /* Start the statement-tree, start the tree now. */
12291 DECL_SAVED_TREE (decl1) = push_stmt_list ();
12293 /* If we are (erroneously) defining a function that we have already
12294 defined before, wipe out what we knew before. */
12295 if (!DECL_PENDING_INLINE_P (decl1))
12296 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
12298 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
12300 /* We know that this was set up by `grokclassfn'. We do not
12301 wait until `store_parm_decls', since evil parse errors may
12302 never get us to that point. Here we keep the consistency
12303 between `current_class_type' and `current_class_ptr'. */
12304 tree t = DECL_ARGUMENTS (decl1);
12306 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
12307 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
12309 cp_function_chain->x_current_class_ref
12310 = cp_build_indirect_ref (t, RO_NULL, tf_warning_or_error);
12311 cp_function_chain->x_current_class_ptr = t;
12313 /* Constructors and destructors need to know whether they're "in
12314 charge" of initializing virtual base classes. */
12315 t = DECL_CHAIN (t);
12316 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
12318 current_in_charge_parm = t;
12319 t = DECL_CHAIN (t);
12321 if (DECL_HAS_VTT_PARM_P (decl1))
12323 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
12324 current_vtt_parm = t;
12328 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
12329 /* Implicitly-defined methods (like the
12330 destructor for a class in which no destructor
12331 is explicitly declared) must not be defined
12332 until their definition is needed. So, we
12333 ignore interface specifications for
12334 compiler-generated functions. */
12335 && !DECL_ARTIFICIAL (decl1));
12337 if (DECL_INTERFACE_KNOWN (decl1))
12339 tree ctx = decl_function_context (decl1);
12341 if (DECL_NOT_REALLY_EXTERN (decl1))
12342 DECL_EXTERNAL (decl1) = 0;
12344 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
12345 && TREE_PUBLIC (ctx))
12346 /* This is a function in a local class in an extern inline
12348 comdat_linkage (decl1);
12350 /* If this function belongs to an interface, it is public.
12351 If it belongs to someone else's interface, it is also external.
12352 This only affects inlines and template instantiations. */
12353 else if (!finfo->interface_unknown && honor_interface)
12355 if (DECL_DECLARED_INLINE_P (decl1)
12356 || DECL_TEMPLATE_INSTANTIATION (decl1)
12357 || processing_template_decl)
12359 DECL_EXTERNAL (decl1)
12360 = (finfo->interface_only
12361 || (DECL_DECLARED_INLINE_P (decl1)
12362 && ! flag_implement_inlines
12363 && !DECL_VINDEX (decl1)));
12365 /* For WIN32 we also want to put these in linkonce sections. */
12366 maybe_make_one_only (decl1);
12369 DECL_EXTERNAL (decl1) = 0;
12370 DECL_INTERFACE_KNOWN (decl1) = 1;
12371 /* If this function is in an interface implemented in this file,
12372 make sure that the back end knows to emit this function
12374 if (!DECL_EXTERNAL (decl1))
12375 mark_needed (decl1);
12377 else if (finfo->interface_unknown && finfo->interface_only
12378 && honor_interface)
12380 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
12381 interface, we will have both finfo->interface_unknown and
12382 finfo->interface_only set. In that case, we don't want to
12383 use the normal heuristics because someone will supply a
12384 #pragma implementation elsewhere, and deducing it here would
12385 produce a conflict. */
12386 comdat_linkage (decl1);
12387 DECL_EXTERNAL (decl1) = 0;
12388 DECL_INTERFACE_KNOWN (decl1) = 1;
12389 DECL_DEFER_OUTPUT (decl1) = 1;
12393 /* This is a definition, not a reference.
12394 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
12395 if (!GNU_INLINE_P (decl1))
12396 DECL_EXTERNAL (decl1) = 0;
12398 if ((DECL_DECLARED_INLINE_P (decl1)
12399 || DECL_TEMPLATE_INSTANTIATION (decl1))
12400 && ! DECL_INTERFACE_KNOWN (decl1))
12401 DECL_DEFER_OUTPUT (decl1) = 1;
12403 DECL_INTERFACE_KNOWN (decl1) = 1;
12406 /* Determine the ELF visibility attribute for the function. We must not
12407 do this before calling "pushdecl", as we must allow "duplicate_decls"
12408 to merge any attributes appropriately. We also need to wait until
12410 if (!DECL_CLONED_FUNCTION_P (decl1))
12411 determine_visibility (decl1);
12413 begin_scope (sk_function_parms, decl1);
12417 if (DECL_DESTRUCTOR_P (decl1)
12418 || (DECL_CONSTRUCTOR_P (decl1)
12419 && targetm.cxx.cdtor_returns_this ()))
12421 cdtor_label = build_decl (input_location,
12422 LABEL_DECL, NULL_TREE, NULL_TREE);
12423 DECL_CONTEXT (cdtor_label) = current_function_decl;
12426 start_fname_decls ();
12428 store_parm_decls (current_function_parms);
12432 /* Like start_preparsed_function, except that instead of a
12433 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
12435 Returns 1 on success. If the DECLARATOR is not suitable for a function
12436 (it defines a datum instead), we return 0, which tells
12437 yyparse to report a parse error. */
12440 start_function (cp_decl_specifier_seq *declspecs,
12441 const cp_declarator *declarator,
12446 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
12447 if (decl1 == error_mark_node)
12449 /* If the declarator is not suitable for a function definition,
12450 cause a syntax error. */
12451 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
12453 error ("invalid function declaration");
12457 if (DECL_MAIN_P (decl1))
12458 /* main must return int. grokfndecl should have corrected it
12459 (and issued a diagnostic) if the user got it wrong. */
12460 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
12461 integer_type_node));
12463 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
12468 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
12472 use_eh_spec_block (tree fn)
12474 return (flag_exceptions && flag_enforce_eh_specs
12475 && !processing_template_decl
12476 && !type_throw_all_p (TREE_TYPE (fn))
12477 /* We insert the EH_SPEC_BLOCK only in the original
12478 function; then, it is copied automatically to the
12480 && !DECL_CLONED_FUNCTION_P (fn)
12481 /* Implicitly-generated constructors and destructors have
12482 exception specifications. However, those specifications
12483 are the union of the possible exceptions specified by the
12484 constructors/destructors for bases and members, so no
12485 unallowed exception will ever reach this function. By
12486 not creating the EH_SPEC_BLOCK we save a little memory,
12487 and we avoid spurious warnings about unreachable
12489 && !DECL_ARTIFICIAL (fn));
12492 /* Store the parameter declarations into the current function declaration.
12493 This is called after parsing the parameter declarations, before
12494 digesting the body of the function.
12496 Also install to binding contour return value identifier, if any. */
12499 store_parm_decls (tree current_function_parms)
12501 tree fndecl = current_function_decl;
12504 /* This is a chain of any other decls that came in among the parm
12505 declarations. If a parm is declared with enum {foo, bar} x;
12506 then CONST_DECLs for foo and bar are put here. */
12507 tree nonparms = NULL_TREE;
12509 if (current_function_parms)
12511 /* This case is when the function was defined with an ANSI prototype.
12512 The parms already have decls, so we need not do anything here
12513 except record them as in effect
12514 and complain if any redundant old-style parm decls were written. */
12516 tree specparms = current_function_parms;
12519 /* Must clear this because it might contain TYPE_DECLs declared
12521 current_binding_level->names = NULL;
12523 /* If we're doing semantic analysis, then we'll call pushdecl
12524 for each of these. We must do them in reverse order so that
12525 they end in the correct forward order. */
12526 specparms = nreverse (specparms);
12528 for (parm = specparms; parm; parm = next)
12530 next = DECL_CHAIN (parm);
12531 if (TREE_CODE (parm) == PARM_DECL)
12533 if (DECL_NAME (parm) == NULL_TREE
12534 || TREE_CODE (parm) != VOID_TYPE)
12537 error ("parameter %qD declared void", parm);
12541 /* If we find an enum constant or a type tag,
12542 put it aside for the moment. */
12543 TREE_CHAIN (parm) = NULL_TREE;
12544 nonparms = chainon (nonparms, parm);
12548 /* Get the decls in their original chain order and record in the
12549 function. This is all and only the PARM_DECLs that were
12550 pushed into scope by the loop above. */
12551 DECL_ARGUMENTS (fndecl) = getdecls ();
12554 DECL_ARGUMENTS (fndecl) = NULL_TREE;
12556 /* Now store the final chain of decls for the arguments
12557 as the decl-chain of the current lexical scope.
12558 Put the enumerators in as well, at the front so that
12559 DECL_ARGUMENTS is not modified. */
12560 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
12562 if (use_eh_spec_block (current_function_decl))
12563 current_eh_spec_block = begin_eh_spec_block ();
12567 /* We have finished doing semantic analysis on DECL, but have not yet
12568 generated RTL for its body. Save away our current state, so that
12569 when we want to generate RTL later we know what to do. */
12572 save_function_data (tree decl)
12574 struct language_function *f;
12576 /* Save the language-specific per-function data so that we can
12577 get it back when we really expand this function. */
12578 gcc_assert (!DECL_PENDING_INLINE_P (decl));
12581 f = ggc_alloc_language_function ();
12582 memcpy (f, cp_function_chain, sizeof (struct language_function));
12583 DECL_SAVED_FUNCTION_DATA (decl) = f;
12585 /* Clear out the bits we don't need. */
12586 f->base.x_stmt_tree.x_cur_stmt_list = NULL_TREE;
12587 f->bindings = NULL;
12588 f->x_local_names = NULL;
12592 /* Set the return value of the constructor (if present). */
12595 finish_constructor_body (void)
12600 if (targetm.cxx.cdtor_returns_this ()
12601 && (! TYPE_FOR_JAVA (current_class_type)))
12603 /* Any return from a constructor will end up here. */
12604 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
12606 val = DECL_ARGUMENTS (current_function_decl);
12607 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
12608 DECL_RESULT (current_function_decl), val);
12609 /* Return the address of the object. */
12610 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
12611 add_stmt (exprstmt);
12615 /* Do all the processing for the beginning of a destructor; set up the
12616 vtable pointers and cleanups for bases and members. */
12619 begin_destructor_body (void)
12621 tree compound_stmt;
12623 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
12624 issued an error message. We still want to try to process the
12625 body of the function, but initialize_vtbl_ptrs will crash if
12626 TYPE_BINFO is NULL. */
12627 if (COMPLETE_TYPE_P (current_class_type))
12629 compound_stmt = begin_compound_stmt (0);
12630 /* Make all virtual function table pointers in non-virtual base
12631 classes point to CURRENT_CLASS_TYPE's virtual function
12633 initialize_vtbl_ptrs (current_class_ptr);
12634 finish_compound_stmt (compound_stmt);
12636 /* And insert cleanups for our bases and members so that they
12637 will be properly destroyed if we throw. */
12638 push_base_cleanups ();
12642 /* At the end of every destructor we generate code to delete the object if
12643 necessary. Do that now. */
12646 finish_destructor_body (void)
12650 /* Any return from a destructor will end up here; that way all base
12651 and member cleanups will be run when the function returns. */
12652 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
12654 /* In a virtual destructor, we must call delete. */
12655 if (DECL_VIRTUAL_P (current_function_decl))
12658 tree virtual_size = cxx_sizeof (current_class_type);
12662 At the point of definition of a virtual destructor (including
12663 an implicit definition), non-placement operator delete shall
12664 be looked up in the scope of the destructor's class and if
12665 found shall be accessible and unambiguous. */
12666 exprstmt = build_op_delete_call(DELETE_EXPR, current_class_ptr,
12668 /*global_p=*/false,
12669 /*placement=*/NULL_TREE,
12670 /*alloc_fn=*/NULL_TREE);
12672 if_stmt = begin_if_stmt ();
12673 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
12674 current_in_charge_parm,
12677 finish_expr_stmt (exprstmt);
12678 finish_then_clause (if_stmt);
12679 finish_if_stmt (if_stmt);
12682 if (targetm.cxx.cdtor_returns_this ())
12686 val = DECL_ARGUMENTS (current_function_decl);
12687 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
12688 DECL_RESULT (current_function_decl), val);
12689 /* Return the address of the object. */
12690 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
12691 add_stmt (exprstmt);
12695 /* Do the necessary processing for the beginning of a function body, which
12696 in this case includes member-initializers, but not the catch clauses of
12697 a function-try-block. Currently, this means opening a binding level
12698 for the member-initializers (in a ctor) and member cleanups (in a dtor). */
12701 begin_function_body (void)
12705 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
12708 if (processing_template_decl)
12709 /* Do nothing now. */;
12711 /* Always keep the BLOCK node associated with the outermost pair of
12712 curly braces of a function. These are needed for correct
12713 operation of dwarfout.c. */
12714 keep_next_level (true);
12716 stmt = begin_compound_stmt (BCS_FN_BODY);
12718 if (processing_template_decl)
12719 /* Do nothing now. */;
12720 else if (DECL_DESTRUCTOR_P (current_function_decl))
12721 begin_destructor_body ();
12726 /* Do the processing for the end of a function body. Currently, this means
12727 closing out the cleanups for fully-constructed bases and members, and in
12728 the case of the destructor, deleting the object if desired. Again, this
12729 is only meaningful for [cd]tors, since they are the only functions where
12730 there is a significant distinction between the main body and any
12731 function catch clauses. Handling, say, main() return semantics here
12732 would be wrong, as flowing off the end of a function catch clause for
12733 main() would also need to return 0. */
12736 finish_function_body (tree compstmt)
12738 if (compstmt == NULL_TREE)
12741 /* Close the block. */
12742 finish_compound_stmt (compstmt);
12744 if (processing_template_decl)
12745 /* Do nothing now. */;
12746 else if (DECL_CONSTRUCTOR_P (current_function_decl))
12747 finish_constructor_body ();
12748 else if (DECL_DESTRUCTOR_P (current_function_decl))
12749 finish_destructor_body ();
12752 /* Given a function, returns the BLOCK corresponding to the outermost level
12753 of curly braces, skipping the artificial block created for constructor
12757 outer_curly_brace_block (tree fndecl)
12759 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
12760 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
12761 /* Skip the artificial function body block. */
12762 block = BLOCK_SUBBLOCKS (block);
12766 /* If FNDECL is a class's key method, add the class to the list of
12767 keyed classes that should be emitted. */
12770 record_key_method_defined (tree fndecl)
12772 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
12773 && DECL_VIRTUAL_P (fndecl)
12774 && !processing_template_decl)
12776 tree fnclass = DECL_CONTEXT (fndecl);
12777 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
12778 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
12782 /* Subroutine of finish_function.
12783 Save the body of constexpr functions for possible
12784 future compile time evaluation. */
12787 maybe_save_function_definition (tree fun)
12789 if (!processing_template_decl
12790 && DECL_DECLARED_CONSTEXPR_P (fun)
12791 && !DECL_CLONED_FUNCTION_P (fun))
12792 register_constexpr_fundef (fun, DECL_SAVED_TREE (fun));
12795 /* Finish up a function declaration and compile that function
12796 all the way to assembler language output. The free the storage
12797 for the function definition.
12799 FLAGS is a bitwise or of the following values:
12801 We just finished processing the body of an in-class inline
12802 function definition. (This processing will have taken place
12803 after the class definition is complete.) */
12806 finish_function (int flags)
12808 tree fndecl = current_function_decl;
12809 tree fntype, ctype = NULL_TREE;
12810 int inclass_inline = (flags & 2) != 0;
12812 /* When we get some parse errors, we can end up without a
12813 current_function_decl, so cope. */
12814 if (fndecl == NULL_TREE)
12815 return error_mark_node;
12817 if (c_dialect_objc ())
12818 objc_finish_function ();
12820 gcc_assert (!defer_mark_used_calls);
12821 defer_mark_used_calls = true;
12823 record_key_method_defined (fndecl);
12825 fntype = TREE_TYPE (fndecl);
12827 /* TREE_READONLY (fndecl) = 1;
12828 This caused &foo to be of type ptr-to-const-function
12829 which then got a warning when stored in a ptr-to-function variable. */
12831 gcc_assert (building_stmt_tree ());
12832 /* The current function is being defined, so its DECL_INITIAL should
12833 be set, and unless there's a multiple definition, it should be
12834 error_mark_node. */
12835 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
12837 /* For a cloned function, we've already got all the code we need;
12838 there's no need to add any extra bits. */
12839 if (!DECL_CLONED_FUNCTION_P (fndecl))
12841 if (DECL_MAIN_P (current_function_decl))
12845 /* Make it so that `main' always returns 0 by default (or
12848 stmt = finish_return_stmt (integer_one_node);
12850 stmt = finish_return_stmt (integer_zero_node);
12852 /* Hack. We don't want the middle-end to warn that this
12853 return is unreachable, so put the statement on the
12856 location_t linezero = linemap_line_start (line_table, 0, 1);
12857 SET_EXPR_LOCATION (stmt, linezero);
12861 if (use_eh_spec_block (current_function_decl))
12862 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
12863 (TREE_TYPE (current_function_decl)),
12864 current_eh_spec_block);
12867 /* If we're saving up tree structure, tie off the function now. */
12868 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
12870 finish_fname_decls ();
12872 /* If this function can't throw any exceptions, remember that. */
12873 if (!processing_template_decl
12874 && !cp_function_chain->can_throw
12875 && !flag_non_call_exceptions
12876 && !decl_replaceable_p (fndecl))
12877 TREE_NOTHROW (fndecl) = 1;
12879 /* This must come after expand_function_end because cleanups might
12880 have declarations (from inline functions) that need to go into
12881 this function's blocks. */
12883 /* If the current binding level isn't the outermost binding level
12884 for this function, either there is a bug, or we have experienced
12885 syntax errors and the statement tree is malformed. */
12886 if (current_binding_level->kind != sk_function_parms)
12888 /* Make sure we have already experienced errors. */
12889 gcc_assert (errorcount);
12891 /* Throw away the broken statement tree and extra binding
12893 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
12895 while (current_binding_level->kind != sk_function_parms)
12897 if (current_binding_level->kind == sk_class)
12898 pop_nested_class ();
12900 poplevel (0, 0, 0);
12903 poplevel (1, 0, 1);
12905 /* Statements should always be full-expressions at the outermost set
12906 of curly braces for a function. */
12907 gcc_assert (stmts_are_full_exprs_p ());
12909 /* Save constexpr function body before it gets munged by
12910 the NRV transformation. */
12911 maybe_save_function_definition (fndecl);
12913 /* Set up the named return value optimization, if we can. Candidate
12914 variables are selected in check_return_expr. */
12915 if (current_function_return_value)
12917 tree r = current_function_return_value;
12920 if (r != error_mark_node
12921 /* This is only worth doing for fns that return in memory--and
12922 simpler, since we don't have to worry about promoted modes. */
12923 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
12924 /* Only allow this for variables declared in the outer scope of
12925 the function so we know that their lifetime always ends with a
12926 return; see g++.dg/opt/nrv6.C. We could be more flexible if
12927 we were to do this optimization in tree-ssa. */
12928 && (outer = outer_curly_brace_block (fndecl))
12929 && chain_member (r, BLOCK_VARS (outer)))
12930 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
12932 current_function_return_value = NULL_TREE;
12935 /* Remember that we were in class scope. */
12936 if (current_class_name)
12937 ctype = current_class_type;
12939 /* Must mark the RESULT_DECL as being in this function. */
12940 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
12942 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
12943 to the FUNCTION_DECL node itself. */
12944 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
12946 /* Save away current state, if appropriate. */
12947 if (!processing_template_decl)
12948 save_function_data (fndecl);
12950 /* Complain if there's just no return statement. */
12951 if (warn_return_type
12952 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
12953 && !dependent_type_p (TREE_TYPE (fntype))
12954 && !current_function_returns_value && !current_function_returns_null
12955 /* Don't complain if we abort or throw. */
12956 && !current_function_returns_abnormally
12957 /* Don't complain if we are declared noreturn. */
12958 && !TREE_THIS_VOLATILE (fndecl)
12959 && !DECL_NAME (DECL_RESULT (fndecl))
12960 && !TREE_NO_WARNING (fndecl)
12961 /* Structor return values (if any) are set by the compiler. */
12962 && !DECL_CONSTRUCTOR_P (fndecl)
12963 && !DECL_DESTRUCTOR_P (fndecl))
12965 warning (OPT_Wreturn_type,
12966 "no return statement in function returning non-void");
12967 TREE_NO_WARNING (fndecl) = 1;
12970 /* Store the end of the function, so that we get good line number
12971 info for the epilogue. */
12972 cfun->function_end_locus = input_location;
12974 /* Complain about parameters that are only set, but never otherwise used. */
12975 if (warn_unused_but_set_parameter
12976 && !processing_template_decl
12977 && errorcount == unused_but_set_errorcount
12978 && !DECL_CLONED_FUNCTION_P (fndecl))
12982 for (decl = DECL_ARGUMENTS (fndecl);
12984 decl = DECL_CHAIN (decl))
12985 if (TREE_USED (decl)
12986 && TREE_CODE (decl) == PARM_DECL
12987 && !DECL_READ_P (decl)
12988 && DECL_NAME (decl)
12989 && !DECL_ARTIFICIAL (decl)
12990 && !TREE_NO_WARNING (decl)
12991 && !DECL_IN_SYSTEM_HEADER (decl)
12992 && TREE_TYPE (decl) != error_mark_node
12993 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
12994 && (!CLASS_TYPE_P (TREE_TYPE (decl))
12995 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
12996 warning (OPT_Wunused_but_set_parameter,
12997 "parameter %q+D set but not used", decl);
12998 unused_but_set_errorcount = errorcount;
13001 /* Genericize before inlining. */
13002 if (!processing_template_decl)
13004 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
13005 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl);
13006 cp_genericize (fndecl);
13007 /* Clear out the bits we don't need. */
13008 f->x_current_class_ptr = NULL;
13009 f->x_current_class_ref = NULL;
13010 f->x_eh_spec_block = NULL;
13011 f->x_in_charge_parm = NULL;
13012 f->x_vtt_parm = NULL;
13013 f->x_return_value = NULL;
13014 f->bindings = NULL;
13015 f->extern_decl_map = NULL;
13017 /* Clear out the bits we don't need. */
13018 local_names = NULL;
13020 /* We're leaving the context of this function, so zap cfun. It's still in
13021 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
13023 current_function_decl = NULL;
13025 /* If this is an in-class inline definition, we may have to pop the
13026 bindings for the template parameters that we added in
13027 maybe_begin_member_template_processing when start_function was
13029 if (inclass_inline)
13030 maybe_end_member_template_processing ();
13032 /* Leave the scope of the class. */
13034 pop_nested_class ();
13039 current_function_decl = NULL_TREE;
13041 defer_mark_used_calls = false;
13042 if (deferred_mark_used_calls)
13047 FOR_EACH_VEC_ELT (tree, deferred_mark_used_calls, i, decl)
13049 VEC_free (tree, gc, deferred_mark_used_calls);
13055 /* Create the FUNCTION_DECL for a function definition.
13056 DECLSPECS and DECLARATOR are the parts of the declaration;
13057 they describe the return type and the name of the function,
13058 but twisted together in a fashion that parallels the syntax of C.
13060 This function creates a binding context for the function body
13061 as well as setting up the FUNCTION_DECL in current_function_decl.
13063 Returns a FUNCTION_DECL on success.
13065 If the DECLARATOR is not suitable for a function (it defines a datum
13066 instead), we return 0, which tells yyparse to report a parse error.
13068 May return void_type_node indicating that this method is actually
13069 a friend. See grokfield for more details.
13071 Came here with a `.pushlevel' .
13073 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
13074 CHANGES TO CODE IN `grokfield'. */
13077 grokmethod (cp_decl_specifier_seq *declspecs,
13078 const cp_declarator *declarator, tree attrlist)
13080 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
13083 if (fndecl == error_mark_node)
13084 return error_mark_node;
13086 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
13088 error ("invalid member function declaration");
13089 return error_mark_node;
13093 cplus_decl_attributes (&fndecl, attrlist, 0);
13095 /* Pass friends other than inline friend functions back. */
13096 if (fndecl == void_type_node)
13099 if (DECL_IN_AGGR_P (fndecl))
13101 if (DECL_CLASS_SCOPE_P (fndecl))
13102 error ("%qD is already defined in class %qT", fndecl,
13103 DECL_CONTEXT (fndecl));
13104 return error_mark_node;
13107 check_template_shadow (fndecl);
13109 DECL_DECLARED_INLINE_P (fndecl) = 1;
13110 DECL_NO_INLINE_WARNING_P (fndecl) = 1;
13112 /* We process method specializations in finish_struct_1. */
13113 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
13115 fndecl = push_template_decl (fndecl);
13116 if (fndecl == error_mark_node)
13120 if (! DECL_FRIEND_P (fndecl))
13122 if (DECL_CHAIN (fndecl))
13124 fndecl = copy_node (fndecl);
13125 TREE_CHAIN (fndecl) = NULL_TREE;
13129 cp_finish_decl (fndecl, NULL_TREE, false, NULL_TREE, 0);
13131 DECL_IN_AGGR_P (fndecl) = 1;
13136 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
13137 we can lay it out later, when and if its type becomes complete. */
13140 maybe_register_incomplete_var (tree var)
13142 gcc_assert (TREE_CODE (var) == VAR_DECL);
13144 /* Keep track of variables with incomplete types. */
13145 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
13146 && DECL_EXTERNAL (var))
13148 tree inner_type = TREE_TYPE (var);
13150 while (TREE_CODE (inner_type) == ARRAY_TYPE)
13151 inner_type = TREE_TYPE (inner_type);
13152 inner_type = TYPE_MAIN_VARIANT (inner_type);
13154 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
13155 /* RTTI TD entries are created while defining the type_info. */
13156 || (TYPE_LANG_SPECIFIC (inner_type)
13157 && TYPE_BEING_DEFINED (inner_type)))
13160 = VEC_safe_push (incomplete_var, gc, incomplete_vars, NULL);
13162 iv->incomplete_type = inner_type;
13167 /* Called when a class type (given by TYPE) is defined. If there are
13168 any existing VAR_DECLs whose type has been completed by this
13169 declaration, update them now. */
13172 complete_vars (tree type)
13175 incomplete_var *iv;
13177 for (ix = 0; VEC_iterate (incomplete_var, incomplete_vars, ix, iv); )
13179 if (same_type_p (type, iv->incomplete_type))
13181 tree var = iv->decl;
13182 tree type = TREE_TYPE (var);
13183 /* Complete the type of the variable. The VAR_DECL itself
13184 will be laid out in expand_expr. */
13185 complete_type (type);
13186 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
13187 /* Remove this entry from the list. */
13188 VEC_unordered_remove (incomplete_var, incomplete_vars, ix);
13194 /* Check for pending declarations which may have abstract type. */
13195 complete_type_check_abstract (type);
13198 /* If DECL is of a type which needs a cleanup, build and return an
13199 expression to perform that cleanup here. Return NULL_TREE if no
13200 cleanup need be done. */
13203 cxx_maybe_build_cleanup (tree decl)
13209 /* Assume no cleanup is required. */
13210 cleanup = NULL_TREE;
13212 if (error_operand_p (decl))
13215 /* Handle "__attribute__((cleanup))". We run the cleanup function
13216 before the destructor since the destructor is what actually
13217 terminates the lifetime of the object. */
13218 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
13225 /* Get the name specified by the user for the cleanup function. */
13226 id = TREE_VALUE (TREE_VALUE (attr));
13227 /* Look up the name to find the cleanup function to call. It is
13228 important to use lookup_name here because that is what is
13229 used in c-common.c:handle_cleanup_attribute when performing
13230 initial checks on the attribute. Note that those checks
13231 include ensuring that the function found is not an overloaded
13232 function, or an object with an overloaded call operator,
13233 etc.; we can rely on the fact that the function found is an
13234 ordinary FUNCTION_DECL. */
13235 fn = lookup_name (id);
13236 arg = build_address (decl);
13238 cleanup = cp_build_function_call_nary (fn, tf_warning_or_error,
13241 /* Handle ordinary C++ destructors. */
13242 type = TREE_TYPE (decl);
13243 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
13245 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
13246 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
13247 && CLASSTYPE_VBASECLASSES (type));
13251 if (TREE_CODE (type) == ARRAY_TYPE)
13254 addr = build_address (decl);
13256 /* Optimize for space over speed here. */
13257 if (!has_vbases || flag_expensive_optimizations)
13258 flags |= LOOKUP_NONVIRTUAL;
13260 call = build_delete (TREE_TYPE (addr), addr,
13261 sfk_complete_destructor, flags, 0);
13263 cleanup = build_compound_expr (input_location, cleanup, call);
13271 /* When a stmt has been parsed, this function is called. */
13278 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
13279 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
13280 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
13283 static_fn_type (tree memfntype)
13288 if (TYPE_PTRMEMFUNC_P (memfntype))
13289 memfntype = TYPE_PTRMEMFUNC_FN_TYPE (memfntype);
13290 if (POINTER_TYPE_P (memfntype)
13291 || TREE_CODE (memfntype) == FUNCTION_DECL)
13292 memfntype = TREE_TYPE (memfntype);
13293 if (TREE_CODE (memfntype) == FUNCTION_TYPE)
13295 gcc_assert (TREE_CODE (memfntype) == METHOD_TYPE);
13296 args = TYPE_ARG_TYPES (memfntype);
13297 fntype = build_function_type (TREE_TYPE (memfntype), TREE_CHAIN (args));
13298 fntype = apply_memfn_quals (fntype, type_memfn_quals (memfntype));
13299 fntype = (cp_build_type_attribute_variant
13300 (fntype, TYPE_ATTRIBUTES (memfntype)));
13301 fntype = (build_exception_variant
13302 (fntype, TYPE_RAISES_EXCEPTIONS (memfntype)));
13306 /* DECL was originally constructed as a non-static member function,
13307 but turned out to be static. Update it accordingly. */
13310 revert_static_member_fn (tree decl)
13312 TREE_TYPE (decl) = static_fn_type (decl);
13314 if (cp_type_quals (TREE_TYPE (decl)) != TYPE_UNQUALIFIED)
13315 error ("static member function %q#D declared with type qualifiers", decl);
13317 if (DECL_ARGUMENTS (decl))
13318 DECL_ARGUMENTS (decl) = DECL_CHAIN (DECL_ARGUMENTS (decl));
13319 DECL_STATIC_FUNCTION_P (decl) = 1;
13322 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
13323 one of the language-independent trees. */
13325 enum cp_tree_node_structure_enum
13326 cp_tree_node_structure (union lang_tree_node * t)
13328 switch (TREE_CODE (&t->generic))
13330 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
13331 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
13332 case OVERLOAD: return TS_CP_OVERLOAD;
13333 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
13334 case PTRMEM_CST: return TS_CP_PTRMEM;
13335 case BASELINK: return TS_CP_BASELINK;
13336 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
13337 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
13338 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
13339 case LAMBDA_EXPR: return TS_CP_LAMBDA_EXPR;
13340 case TEMPLATE_INFO: return TS_CP_TEMPLATE_INFO;
13341 default: return TS_CP_GENERIC;
13345 /* Build the void_list_node (void_type_node having been created). */
13347 build_void_list_node (void)
13349 tree t = build_tree_list (NULL_TREE, void_type_node);
13354 cp_missing_noreturn_ok_p (tree decl)
13356 /* A missing noreturn is ok for the `main' function. */
13357 return DECL_MAIN_P (decl);
13360 /* Return the COMDAT group into which DECL should be placed. */
13363 cxx_comdat_group (tree decl)
13367 /* Virtual tables, construction virtual tables, and virtual table
13368 tables all go in a single COMDAT group, named after the primary
13370 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
13371 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
13372 /* For all other DECLs, the COMDAT group is the mangled name of the
13373 declaration itself. */
13376 while (DECL_THUNK_P (decl))
13378 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
13379 into the same section as the target function. In that case
13380 we must return target's name. */
13381 tree target = THUNK_TARGET (decl);
13382 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
13383 && DECL_SECTION_NAME (target) != NULL
13384 && DECL_ONE_ONLY (target))
13389 name = DECL_ASSEMBLER_NAME (decl);
13395 #include "gt-cp-decl.h"