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
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"
40 #include "tree-inline.h"
50 #include "diagnostic.h"
54 #include "tree-flow.h"
55 #include "pointer-set.h"
57 static tree grokparms (cp_parameter_declarator *, tree *);
58 static const char *redeclaration_error_message (tree, tree);
60 static int decl_jump_unsafe (tree);
61 static void require_complete_types_for_parms (tree);
62 static int ambi_op_p (enum tree_code);
63 static int unary_op_p (enum tree_code);
64 static void push_local_name (tree);
65 static tree grok_reference_init (tree, tree, tree, tree *);
66 static tree grokvardecl (tree, tree, const cp_decl_specifier_seq *,
68 static void record_unknown_type (tree, const char *);
69 static tree builtin_function_1 (tree, tree);
70 static tree build_library_fn_1 (tree, enum tree_code, tree);
71 static int member_function_or_else (tree, tree, enum overload_flags);
72 static void bad_specifiers (tree, const char *, int, int, int, int,
74 static void check_for_uninitialized_const_var (tree);
75 static hashval_t typename_hash (const void *);
76 static int typename_compare (const void *, const void *);
77 static tree local_variable_p_walkfn (tree *, int *, void *);
78 static tree record_builtin_java_type (const char *, int);
79 static const char *tag_name (enum tag_types);
80 static tree lookup_and_check_tag (enum tag_types, tree, tag_scope, bool);
81 static int walk_namespaces_r (tree, walk_namespaces_fn, void *);
82 static void maybe_deduce_size_from_array_init (tree, tree);
83 static void layout_var_decl (tree);
84 static void maybe_commonize_var (tree);
85 static tree check_initializer (tree, tree, int, tree *);
86 static void make_rtl_for_nonlocal_decl (tree, tree, const char *);
87 static void save_function_data (tree);
88 static void check_function_type (tree, tree);
89 static void finish_constructor_body (void);
90 static void begin_destructor_body (void);
91 static void finish_destructor_body (void);
92 static tree create_array_type_for_decl (tree, tree, tree);
93 static tree get_atexit_node (void);
94 static tree get_dso_handle_node (void);
95 static tree start_cleanup_fn (void);
96 static void end_cleanup_fn (void);
97 static tree cp_make_fname_decl (tree, int);
98 static void initialize_predefined_identifiers (void);
99 static tree check_special_function_return_type
100 (special_function_kind, tree, tree);
101 static tree push_cp_library_fn (enum tree_code, tree);
102 static tree build_cp_library_fn (tree, enum tree_code, tree);
103 static void store_parm_decls (tree);
104 static void initialize_local_var (tree, tree);
105 static void expand_static_init (tree, tree);
106 static tree next_initializable_field (tree);
108 /* The following symbols are subsumed in the cp_global_trees array, and
109 listed here individually for documentation purposes.
112 tree wchar_decl_node;
114 tree vtable_entry_type;
115 tree delta_type_node;
116 tree __t_desc_type_node;
118 tree class_type_node;
119 tree unknown_type_node;
121 Array type `vtable_entry_type[]'
124 tree vtbl_ptr_type_node;
131 A FUNCTION_DECL which can call `abort'. Not necessarily the
132 one that the user will declare, but sufficient to be called
133 by routines that want to abort the program.
137 The FUNCTION_DECL for the default `::operator delete'.
139 tree global_delete_fndecl;
142 tree type_info_type_node, tinfo_decl_id, tinfo_decl_type;
143 tree tinfo_var_id; */
145 tree cp_global_trees[CPTI_MAX];
147 /* Indicates that there is a type value in some namespace, although
148 that is not necessarily in scope at the moment. */
150 tree global_type_node;
152 /* The node that holds the "name" of the global scope. */
153 tree global_scope_name;
155 #define local_names cp_function_chain->x_local_names
157 /* A list of objects which have constructors or destructors
158 which reside in the global scope. The decl is stored in
159 the TREE_VALUE slot and the initializer is stored
160 in the TREE_PURPOSE slot. */
161 tree static_aggregates;
165 /* A node for the integer constants 2, and 3. */
167 tree integer_two_node, integer_three_node;
169 /* Used only for jumps to as-yet undefined labels, since jumps to
170 defined labels can have their validity checked immediately. */
172 struct named_label_use_entry GTY(())
174 struct named_label_use_entry *next;
175 /* The binding level to which this entry is *currently* attached.
176 This is initially the binding level in which the goto appeared,
177 but is modified as scopes are closed. */
178 struct cp_binding_level *binding_level;
179 /* The head of the names list that was current when the goto appeared,
180 or the inner scope popped. These are the decls that will *not* be
181 skipped when jumping to the label. */
183 /* The location of the goto, for error reporting. */
184 location_t o_goto_locus;
185 /* True if an OpenMP structured block scope has been closed since
186 the goto appeared. This means that the branch from the label will
187 illegally exit an OpenMP scope. */
191 /* A list of all LABEL_DECLs in the function that have names. Here so
192 we can clear out their names' definitions at the end of the
193 function, and so we can check the validity of jumps to these labels. */
195 struct named_label_entry GTY(())
197 /* The decl itself. */
200 /* The binding level to which the label is *currently* attached.
201 This is initially set to the binding level in which the label
202 is defined, but is modified as scopes are closed. */
203 struct cp_binding_level *binding_level;
204 /* The head of the names list that was current when the label was
205 defined, or the inner scope popped. These are the decls that will
206 be skipped when jumping to the label. */
208 /* A tree list of all decls from all binding levels that would be
209 crossed by a backward branch to the label. */
212 /* A list of uses of the label, before the label is defined. */
213 struct named_label_use_entry *uses;
215 /* The following bits are set after the label is defined, and are
216 updated as scopes are popped. They indicate that a backward jump
217 to the label will illegally enter a scope of the given flavor. */
223 #define named_labels cp_function_chain->x_named_labels
225 /* The number of function bodies which we are currently processing.
226 (Zero if we are at namespace scope, one inside the body of a
227 function, two inside the body of a function in a local class, etc.) */
230 /* States indicating how grokdeclarator() should handle declspecs marked
231 with __attribute__((deprecated)). An object declared as
232 __attribute__((deprecated)) suppresses warnings of uses of other
235 enum deprecated_states {
240 static enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
243 /* A TREE_LIST of VAR_DECLs. The TREE_PURPOSE is a RECORD_TYPE or
244 UNION_TYPE; the TREE_VALUE is a VAR_DECL with that type. At the
245 time the VAR_DECL was declared, the type was incomplete. */
247 static GTY(()) tree incomplete_vars;
249 /* Returns the kind of template specialization we are currently
250 processing, given that it's declaration contained N_CLASS_SCOPES
251 explicit scope qualifications. */
254 current_tmpl_spec_kind (int n_class_scopes)
256 int n_template_parm_scopes = 0;
257 int seen_specialization_p = 0;
258 int innermost_specialization_p = 0;
259 struct cp_binding_level *b;
261 /* Scan through the template parameter scopes. */
262 for (b = current_binding_level;
263 b->kind == sk_template_parms;
266 /* If we see a specialization scope inside a parameter scope,
267 then something is wrong. That corresponds to a declaration
270 template <class T> template <> ...
272 which is always invalid since [temp.expl.spec] forbids the
273 specialization of a class member template if the enclosing
274 class templates are not explicitly specialized as well. */
275 if (b->explicit_spec_p)
277 if (n_template_parm_scopes == 0)
278 innermost_specialization_p = 1;
280 seen_specialization_p = 1;
282 else if (seen_specialization_p == 1)
283 return tsk_invalid_member_spec;
285 ++n_template_parm_scopes;
288 /* Handle explicit instantiations. */
289 if (processing_explicit_instantiation)
291 if (n_template_parm_scopes != 0)
292 /* We've seen a template parameter list during an explicit
293 instantiation. For example:
295 template <class T> template void f(int);
297 This is erroneous. */
298 return tsk_invalid_expl_inst;
300 return tsk_expl_inst;
303 if (n_template_parm_scopes < n_class_scopes)
304 /* We've not seen enough template headers to match all the
305 specialized classes present. For example:
307 template <class T> void R<T>::S<T>::f(int);
309 This is invalid; there needs to be one set of template
310 parameters for each class. */
311 return tsk_insufficient_parms;
312 else if (n_template_parm_scopes == n_class_scopes)
313 /* We're processing a non-template declaration (even though it may
314 be a member of a template class.) For example:
316 template <class T> void S<T>::f(int);
318 The `class T' matches the `S<T>', leaving no template headers
319 corresponding to the `f'. */
321 else if (n_template_parm_scopes > n_class_scopes + 1)
322 /* We've got too many template headers. For example:
324 template <> template <class T> void f (T);
326 There need to be more enclosing classes. */
327 return tsk_excessive_parms;
329 /* This must be a template. It's of the form:
331 template <class T> template <class U> void S<T>::f(U);
333 This is a specialization if the innermost level was a
334 specialization; otherwise it's just a definition of the
336 return innermost_specialization_p ? tsk_expl_spec : tsk_template;
339 /* Exit the current scope. */
347 /* When a label goes out of scope, check to see if that label was used
348 in a valid manner, and issue any appropriate warnings or errors. */
351 pop_label (tree label, tree old_value)
353 if (!processing_template_decl)
355 if (DECL_INITIAL (label) == NULL_TREE)
359 error ("label %q+D used but not defined", label);
360 location = input_location; /* FIXME want (input_filename, (line)0) */
361 /* Avoid crashing later. */
362 define_label (location, DECL_NAME (label));
365 warn_for_unused_label (label);
368 SET_IDENTIFIER_LABEL_VALUE (DECL_NAME (label), old_value);
371 /* At the end of a function, all labels declared within the function
372 go out of scope. BLOCK is the top-level block for the
376 pop_labels_1 (void **slot, void *data)
378 struct named_label_entry *ent = (struct named_label_entry *) *slot;
379 tree block = (tree) data;
381 pop_label (ent->label_decl, NULL_TREE);
383 /* Put the labels into the "variables" of the top-level block,
384 so debugger can see them. */
385 TREE_CHAIN (ent->label_decl) = BLOCK_VARS (block);
386 BLOCK_VARS (block) = ent->label_decl;
388 htab_clear_slot (named_labels, slot);
394 pop_labels (tree block)
398 htab_traverse (named_labels, pop_labels_1, block);
403 /* At the end of a block with local labels, restore the outer definition. */
406 pop_local_label (tree label, tree old_value)
408 struct named_label_entry dummy;
411 pop_label (label, old_value);
413 dummy.label_decl = label;
414 slot = htab_find_slot (named_labels, &dummy, NO_INSERT);
415 htab_clear_slot (named_labels, slot);
418 /* The following two routines are used to interface to Objective-C++.
419 The binding level is purposely treated as an opaque type. */
422 objc_get_current_scope (void)
424 return current_binding_level;
427 /* The following routine is used by the NeXT-style SJLJ exceptions;
428 variables get marked 'volatile' so as to not be clobbered by
429 _setjmp()/_longjmp() calls. All variables in the current scope,
430 as well as parent scopes up to (but not including) ENCLOSING_BLK
431 shall be thusly marked. */
434 objc_mark_locals_volatile (void *enclosing_blk)
436 struct cp_binding_level *scope;
438 for (scope = current_binding_level;
439 scope && scope != enclosing_blk;
440 scope = scope->level_chain)
444 for (decl = scope->names; decl; decl = TREE_CHAIN (decl))
445 objc_volatilize_decl (decl);
447 /* Do not climb up past the current function. */
448 if (scope->kind == sk_function_parms)
453 /* Update data for defined and undefined labels when leaving a scope. */
456 poplevel_named_label_1 (void **slot, void *data)
458 struct named_label_entry *ent = (struct named_label_entry *) *slot;
459 struct cp_binding_level *bl = (struct cp_binding_level *) data;
460 struct cp_binding_level *obl = bl->level_chain;
462 if (ent->binding_level == bl)
466 for (decl = ent->names_in_scope; decl; decl = TREE_CHAIN (decl))
467 if (decl_jump_unsafe (decl))
468 ent->bad_decls = tree_cons (NULL, decl, ent->bad_decls);
470 ent->binding_level = obl;
471 ent->names_in_scope = obl->names;
475 ent->in_try_scope = true;
478 ent->in_catch_scope = true;
481 ent->in_omp_scope = true;
489 struct named_label_use_entry *use;
491 for (use = ent->uses; use ; use = use->next)
492 if (use->binding_level == bl)
494 use->binding_level = obl;
495 use->names_in_scope = obl->names;
496 if (bl->kind == sk_omp)
497 use->in_omp_scope = true;
504 /* Exit a binding level.
505 Pop the level off, and restore the state of the identifier-decl mappings
506 that were in effect when this level was entered.
508 If KEEP == 1, this level had explicit declarations, so
509 and create a "block" (a BLOCK node) for the level
510 to record its declarations and subblocks for symbol table output.
512 If FUNCTIONBODY is nonzero, this level is the body of a function,
513 so create a block as if KEEP were set and also clear out all
516 If REVERSE is nonzero, reverse the order of decls before putting
517 them into the BLOCK. */
520 poplevel (int keep, int reverse, int functionbody)
523 /* The chain of decls was accumulated in reverse order.
524 Put it into forward order, just for cleanliness. */
526 int tmp = functionbody;
527 int real_functionbody;
531 int leaving_for_scope;
534 timevar_push (TV_NAME_LOOKUP);
539 gcc_assert (current_binding_level->kind != sk_class);
541 real_functionbody = (current_binding_level->kind == sk_cleanup
542 ? ((functionbody = 0), tmp) : functionbody);
543 subblocks = functionbody >= 0 ? current_binding_level->blocks : 0;
545 gcc_assert (!VEC_length(cp_class_binding,
546 current_binding_level->class_shadowed));
548 /* We used to use KEEP == 2 to indicate that the new block should go
549 at the beginning of the list of blocks at this binding level,
550 rather than the end. This hack is no longer used. */
551 gcc_assert (keep == 0 || keep == 1);
553 if (current_binding_level->keep)
556 /* Any uses of undefined labels, and any defined labels, now operate
557 under constraints of next binding contour. */
558 if (cfun && !functionbody && named_labels)
559 htab_traverse (named_labels, poplevel_named_label_1,
560 current_binding_level);
562 /* Get the decls in the order they were written.
563 Usually current_binding_level->names is in reverse order.
564 But parameter decls were previously put in forward order. */
567 current_binding_level->names
568 = decls = nreverse (current_binding_level->names);
570 decls = current_binding_level->names;
572 /* If there were any declarations or structure tags in that level,
573 or if this level is a function body,
574 create a BLOCK to record them for the life of this function. */
576 if (keep == 1 || functionbody)
577 block = make_node (BLOCK);
578 if (block != NULL_TREE)
580 BLOCK_VARS (block) = decls;
581 BLOCK_SUBBLOCKS (block) = subblocks;
584 /* In each subblock, record that this is its superior. */
586 for (link = subblocks; link; link = BLOCK_CHAIN (link))
587 BLOCK_SUPERCONTEXT (link) = block;
589 /* We still support the old for-scope rules, whereby the variables
590 in a for-init statement were in scope after the for-statement
591 ended. We only use the new rules if flag_new_for_scope is
594 = current_binding_level->kind == sk_for && flag_new_for_scope == 1;
596 /* Before we remove the declarations first check for unused variables. */
597 if (warn_unused_variable
598 && !processing_template_decl)
599 for (decl = getdecls (); decl; decl = TREE_CHAIN (decl))
600 if (TREE_CODE (decl) == VAR_DECL
601 && ! TREE_USED (decl)
602 && ! DECL_IN_SYSTEM_HEADER (decl)
603 && DECL_NAME (decl) && ! DECL_ARTIFICIAL (decl))
604 warning (OPT_Wunused_variable, "unused variable %q+D", decl);
606 /* Remove declarations for all the DECLs in this level. */
607 for (link = decls; link; link = TREE_CHAIN (link))
609 if (leaving_for_scope && TREE_CODE (link) == VAR_DECL
612 tree name = DECL_NAME (link);
616 ob = outer_binding (name,
617 IDENTIFIER_BINDING (name),
620 ns_binding = IDENTIFIER_NAMESPACE_VALUE (name);
622 ns_binding = NULL_TREE;
624 if (ob && ob->scope == current_binding_level->level_chain)
625 /* We have something like:
630 and we are leaving the `for' scope. There's no reason to
631 keep the binding of the inner `i' in this case. */
632 pop_binding (name, link);
633 else if ((ob && (TREE_CODE (ob->value) == TYPE_DECL))
634 || (ns_binding && TREE_CODE (ns_binding) == TYPE_DECL))
635 /* Here, we have something like:
643 We must pop the for-scope binding so we know what's a
644 type and what isn't. */
645 pop_binding (name, link);
648 /* Mark this VAR_DECL as dead so that we can tell we left it
649 there only for backward compatibility. */
650 DECL_DEAD_FOR_LOCAL (link) = 1;
652 /* Keep track of what should have happened when we
653 popped the binding. */
656 SET_DECL_SHADOWED_FOR_VAR (link, ob->value);
657 DECL_HAS_SHADOWED_FOR_VAR_P (link) = 1;
660 /* Add it to the list of dead variables in the next
661 outermost binding to that we can remove these when we
662 leave that binding. */
663 current_binding_level->level_chain->dead_vars_from_for
664 = tree_cons (NULL_TREE, link,
665 current_binding_level->level_chain->
668 /* Although we don't pop the cxx_binding, we do clear
669 its SCOPE since the scope is going away now. */
670 IDENTIFIER_BINDING (name)->scope
671 = current_binding_level->level_chain;
678 /* Remove the binding. */
681 if (TREE_CODE (decl) == TREE_LIST)
682 decl = TREE_VALUE (decl);
685 if (TREE_CODE (name) == OVERLOAD)
686 name = OVL_FUNCTION (name);
688 gcc_assert (DECL_P (name));
689 pop_binding (DECL_NAME (name), decl);
693 /* Remove declarations for any `for' variables from inner scopes
694 that we kept around. */
695 for (link = current_binding_level->dead_vars_from_for;
696 link; link = TREE_CHAIN (link))
697 pop_binding (DECL_NAME (TREE_VALUE (link)), TREE_VALUE (link));
699 /* Restore the IDENTIFIER_TYPE_VALUEs. */
700 for (link = current_binding_level->type_shadowed;
701 link; link = TREE_CHAIN (link))
702 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (link), TREE_VALUE (link));
704 /* Restore the IDENTIFIER_LABEL_VALUEs for local labels. */
705 for (link = current_binding_level->shadowed_labels;
707 link = TREE_CHAIN (link))
708 pop_local_label (TREE_VALUE (link), TREE_PURPOSE (link));
710 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
711 list if a `using' declaration put them there. The debugging
712 back ends won't understand OVERLOAD, so we remove them here.
713 Because the BLOCK_VARS are (temporarily) shared with
714 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
715 popped all the bindings. */
720 for (d = &BLOCK_VARS (block); *d; )
722 if (TREE_CODE (*d) == TREE_LIST)
723 *d = TREE_CHAIN (*d);
725 d = &TREE_CHAIN (*d);
729 /* If the level being exited is the top level of a function,
730 check over all the labels. */
733 /* Since this is the top level block of a function, the vars are
734 the function's parameters. Don't leave them in the BLOCK
735 because they are found in the FUNCTION_DECL instead. */
736 BLOCK_VARS (block) = 0;
740 kind = current_binding_level->kind;
741 if (kind == sk_cleanup)
745 /* If this is a temporary binding created for a cleanup, then we'll
746 have pushed a statement list level. Pop that, create a new
747 BIND_EXPR for the block, and insert it into the stream. */
748 stmt = pop_stmt_list (current_binding_level->statement_list);
749 stmt = c_build_bind_expr (block, stmt);
756 /* The current function is being defined, so its DECL_INITIAL
757 should be error_mark_node. */
758 gcc_assert (DECL_INITIAL (current_function_decl) == error_mark_node);
759 DECL_INITIAL (current_function_decl) = block;
762 current_binding_level->blocks
763 = chainon (current_binding_level->blocks, block);
765 /* If we did not make a block for the level just exited,
766 any blocks made for inner levels
767 (since they cannot be recorded as subblocks in that level)
768 must be carried forward so they will later become subblocks
769 of something else. */
771 current_binding_level->blocks
772 = chainon (current_binding_level->blocks, subblocks);
774 /* Each and every BLOCK node created here in `poplevel' is important
775 (e.g. for proper debugging information) so if we created one
776 earlier, mark it as "used". */
778 TREE_USED (block) = 1;
780 /* All temporary bindings created for cleanups are popped silently. */
781 if (kind == sk_cleanup)
784 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, block);
787 /* Insert BLOCK at the end of the list of subblocks of the
788 current binding level. This is used when a BIND_EXPR is expanded,
789 to handle the BLOCK node inside the BIND_EXPR. */
792 insert_block (tree block)
794 TREE_USED (block) = 1;
795 current_binding_level->blocks
796 = chainon (current_binding_level->blocks, block);
799 /* Walk all the namespaces contained NAMESPACE, including NAMESPACE
800 itself, calling F for each. The DATA is passed to F as well. */
803 walk_namespaces_r (tree name_space, walk_namespaces_fn f, void* data)
806 tree current = NAMESPACE_LEVEL (name_space)->namespaces;
808 result |= (*f) (name_space, data);
810 for (; current; current = TREE_CHAIN (current))
811 result |= walk_namespaces_r (current, f, data);
816 /* Walk all the namespaces, calling F for each. The DATA is passed to
820 walk_namespaces (walk_namespaces_fn f, void* data)
822 return walk_namespaces_r (global_namespace, f, data);
825 /* Call wrapup_globals_declarations for the globals in NAMESPACE. If
826 DATA is non-NULL, this is the last time we will call
827 wrapup_global_declarations for this NAMESPACE. */
830 wrapup_globals_for_namespace (tree name_space, void* data)
832 struct cp_binding_level *level = NAMESPACE_LEVEL (name_space);
833 VEC(tree,gc) *statics = level->static_decls;
834 tree *vec = VEC_address (tree, statics);
835 int len = VEC_length (tree, statics);
836 int last_time = (data != 0);
840 check_global_declarations (vec, len);
841 emit_debug_global_declarations (vec, len);
845 /* Write out any globals that need to be output. */
846 return wrapup_global_declarations (vec, len);
850 /* In C++, you don't have to write `struct S' to refer to `S'; you
851 can just use `S'. We accomplish this by creating a TYPE_DECL as
852 if the user had written `typedef struct S S'. Create and return
853 the TYPE_DECL for TYPE. */
856 create_implicit_typedef (tree name, tree type)
860 decl = build_decl (TYPE_DECL, name, type);
861 DECL_ARTIFICIAL (decl) = 1;
862 /* There are other implicit type declarations, like the one *within*
863 a class that allows you to write `S::S'. We must distinguish
865 SET_DECL_IMPLICIT_TYPEDEF_P (decl);
866 TYPE_NAME (type) = decl;
871 /* Remember a local name for name-mangling purposes. */
874 push_local_name (tree decl)
879 timevar_push (TV_NAME_LOOKUP);
881 name = DECL_NAME (decl);
883 nelts = VEC_length (tree, local_names);
884 for (i = 0; i < nelts; i++)
886 t = VEC_index (tree, local_names, i);
887 if (DECL_NAME (t) == name)
889 if (!DECL_LANG_SPECIFIC (decl))
890 retrofit_lang_decl (decl);
891 DECL_LANG_SPECIFIC (decl)->decl_flags.u2sel = 1;
892 if (DECL_LANG_SPECIFIC (t))
893 DECL_DISCRIMINATOR (decl) = DECL_DISCRIMINATOR (t) + 1;
895 DECL_DISCRIMINATOR (decl) = 1;
897 VEC_replace (tree, local_names, i, decl);
898 timevar_pop (TV_NAME_LOOKUP);
903 VEC_safe_push (tree, gc, local_names, decl);
904 timevar_pop (TV_NAME_LOOKUP);
907 /* Subroutine of duplicate_decls: return truthvalue of whether
908 or not types of these decls match.
910 For C++, we must compare the parameter list so that `int' can match
911 `int&' in a parameter position, but `int&' is not confused with
915 decls_match (tree newdecl, tree olddecl)
919 if (newdecl == olddecl)
922 if (TREE_CODE (newdecl) != TREE_CODE (olddecl))
923 /* If the two DECLs are not even the same kind of thing, we're not
924 interested in their types. */
927 if (TREE_CODE (newdecl) == FUNCTION_DECL)
929 tree f1 = TREE_TYPE (newdecl);
930 tree f2 = TREE_TYPE (olddecl);
931 tree p1 = TYPE_ARG_TYPES (f1);
932 tree p2 = TYPE_ARG_TYPES (f2);
934 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
935 && ! (DECL_EXTERN_C_P (newdecl)
936 && DECL_EXTERN_C_P (olddecl)))
939 if (TREE_CODE (f1) != TREE_CODE (f2))
942 if (same_type_p (TREE_TYPE (f1), TREE_TYPE (f2)))
944 if (p2 == NULL_TREE && DECL_EXTERN_C_P (olddecl)
945 && (DECL_BUILT_IN (olddecl)
946 #ifndef NO_IMPLICIT_EXTERN_C
947 || (DECL_IN_SYSTEM_HEADER (newdecl) && !DECL_CLASS_SCOPE_P (newdecl))
948 || (DECL_IN_SYSTEM_HEADER (olddecl) && !DECL_CLASS_SCOPE_P (olddecl))
952 types_match = self_promoting_args_p (p1);
953 if (p1 == void_list_node)
954 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
956 #ifndef NO_IMPLICIT_EXTERN_C
957 else if (p1 == NULL_TREE
958 && (DECL_EXTERN_C_P (olddecl)
959 && DECL_IN_SYSTEM_HEADER (olddecl)
960 && !DECL_CLASS_SCOPE_P (olddecl))
961 && (DECL_EXTERN_C_P (newdecl)
962 && DECL_IN_SYSTEM_HEADER (newdecl)
963 && !DECL_CLASS_SCOPE_P (newdecl)))
965 types_match = self_promoting_args_p (p2);
966 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
970 types_match = compparms (p1, p2);
975 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
977 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl))
978 != TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)))
981 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
982 DECL_TEMPLATE_PARMS (olddecl)))
985 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
986 types_match = same_type_p (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl)),
987 TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl)));
989 types_match = decls_match (DECL_TEMPLATE_RESULT (olddecl),
990 DECL_TEMPLATE_RESULT (newdecl));
994 /* Need to check scope for variable declaration (VAR_DECL).
995 For typedef (TYPE_DECL), scope is ignored. */
996 if (TREE_CODE (newdecl) == VAR_DECL
997 && CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
999 Two declarations for an object with C language linkage
1000 with the same name (ignoring the namespace that qualify
1001 it) that appear in different namespace scopes refer to
1003 && !(DECL_EXTERN_C_P (olddecl) && DECL_EXTERN_C_P (newdecl)))
1006 if (TREE_TYPE (newdecl) == error_mark_node)
1007 types_match = TREE_TYPE (olddecl) == error_mark_node;
1008 else if (TREE_TYPE (olddecl) == NULL_TREE)
1009 types_match = TREE_TYPE (newdecl) == NULL_TREE;
1010 else if (TREE_TYPE (newdecl) == NULL_TREE)
1013 types_match = comptypes (TREE_TYPE (newdecl),
1014 TREE_TYPE (olddecl),
1015 COMPARE_REDECLARATION);
1021 /* If NEWDECL is `static' and an `extern' was seen previously,
1022 warn about it. OLDDECL is the previous declaration.
1024 Note that this does not apply to the C++ case of declaring
1025 a variable `extern const' and then later `const'.
1027 Don't complain about built-in functions, since they are beyond
1028 the user's control. */
1031 warn_extern_redeclared_static (tree newdecl, tree olddecl)
1035 if (TREE_CODE (newdecl) == TYPE_DECL
1036 || TREE_CODE (newdecl) == TEMPLATE_DECL
1037 || TREE_CODE (newdecl) == CONST_DECL
1038 || TREE_CODE (newdecl) == NAMESPACE_DECL)
1041 /* Don't get confused by static member functions; that's a different
1043 if (TREE_CODE (newdecl) == FUNCTION_DECL
1044 && DECL_STATIC_FUNCTION_P (newdecl))
1047 /* If the old declaration was `static', or the new one isn't, then
1048 then everything is OK. */
1049 if (DECL_THIS_STATIC (olddecl) || !DECL_THIS_STATIC (newdecl))
1052 /* It's OK to declare a builtin function as `static'. */
1053 if (TREE_CODE (olddecl) == FUNCTION_DECL
1054 && DECL_ARTIFICIAL (olddecl))
1057 name = DECL_ASSEMBLER_NAME (newdecl);
1058 permerror (input_location, "%qD was declared %<extern%> and later %<static%>", newdecl);
1059 permerror (input_location, "previous declaration of %q+D", olddecl);
1062 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1063 function templates. If their exception specifications do not
1064 match, issue a diagnostic. */
1067 check_redeclaration_exception_specification (tree new_decl,
1072 tree new_exceptions;
1073 tree old_exceptions;
1075 new_type = TREE_TYPE (new_decl);
1076 new_exceptions = TYPE_RAISES_EXCEPTIONS (new_type);
1077 old_type = TREE_TYPE (old_decl);
1078 old_exceptions = TYPE_RAISES_EXCEPTIONS (old_type);
1082 If any declaration of a function has an exception-specification,
1083 all declarations, including the definition and an explicit
1084 specialization, of that function shall have an
1085 exception-specification with the same set of type-ids. */
1086 if ((pedantic || ! DECL_IN_SYSTEM_HEADER (old_decl))
1087 && ! DECL_IS_BUILTIN (old_decl)
1089 && !comp_except_specs (new_exceptions, old_exceptions,
1092 error ("declaration of %qF throws different exceptions", new_decl);
1093 error ("from previous declaration %q+F", old_decl);
1097 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1098 && lookup_attribute ("gnu_inline", \
1099 DECL_ATTRIBUTES (fn)))
1101 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1102 If the redeclaration is invalid, a diagnostic is issued, and the
1103 error_mark_node is returned. Otherwise, OLDDECL is returned.
1105 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1108 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1111 duplicate_decls (tree newdecl, tree olddecl, bool newdecl_is_friend)
1113 unsigned olddecl_uid = DECL_UID (olddecl);
1114 int olddecl_friend = 0, types_match = 0, hidden_friend = 0;
1115 int new_defines_function = 0;
1118 if (newdecl == olddecl)
1121 types_match = decls_match (newdecl, olddecl);
1123 /* If either the type of the new decl or the type of the old decl is an
1124 error_mark_node, then that implies that we have already issued an
1125 error (earlier) for some bogus type specification, and in that case,
1126 it is rather pointless to harass the user with yet more error message
1127 about the same declaration, so just pretend the types match here. */
1128 if (TREE_TYPE (newdecl) == error_mark_node
1129 || TREE_TYPE (olddecl) == error_mark_node)
1130 return error_mark_node;
1132 if (DECL_P (olddecl)
1133 && TREE_CODE (newdecl) == FUNCTION_DECL
1134 && TREE_CODE (olddecl) == FUNCTION_DECL
1135 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1137 if (DECL_DECLARED_INLINE_P (newdecl)
1138 && DECL_UNINLINABLE (newdecl)
1139 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1140 /* Already warned elsewhere. */;
1141 else if (DECL_DECLARED_INLINE_P (olddecl)
1142 && DECL_UNINLINABLE (olddecl)
1143 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1144 /* Already warned. */;
1145 else if (DECL_DECLARED_INLINE_P (newdecl)
1146 && DECL_UNINLINABLE (olddecl)
1147 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1149 warning (OPT_Wattributes, "function %q+D redeclared as inline",
1151 warning (OPT_Wattributes, "previous declaration of %q+D "
1152 "with attribute noinline", olddecl);
1154 else if (DECL_DECLARED_INLINE_P (olddecl)
1155 && DECL_UNINLINABLE (newdecl)
1156 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1158 warning (OPT_Wattributes, "function %q+D redeclared with "
1159 "attribute noinline", newdecl);
1160 warning (OPT_Wattributes, "previous declaration of %q+D was inline",
1165 /* Check for redeclaration and other discrepancies. */
1166 if (TREE_CODE (olddecl) == FUNCTION_DECL
1167 && DECL_ARTIFICIAL (olddecl))
1169 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl));
1170 if (TREE_CODE (newdecl) != FUNCTION_DECL)
1172 /* Avoid warnings redeclaring built-ins which have not been
1173 explicitly declared. */
1174 if (DECL_ANTICIPATED (olddecl))
1177 /* If you declare a built-in or predefined function name as static,
1178 the old definition is overridden, but optionally warn this was a
1179 bad choice of name. */
1180 if (! TREE_PUBLIC (newdecl))
1182 warning (OPT_Wshadow, "shadowing %s function %q#D",
1183 DECL_BUILT_IN (olddecl) ? "built-in" : "library",
1185 /* Discard the old built-in function. */
1188 /* If the built-in is not ansi, then programs can override
1189 it even globally without an error. */
1190 else if (! DECL_BUILT_IN (olddecl))
1191 warning (0, "library function %q#D redeclared as non-function %q#D",
1195 error ("declaration of %q#D", newdecl);
1196 error ("conflicts with built-in declaration %q#D",
1201 else if (!types_match)
1203 /* Avoid warnings redeclaring built-ins which have not been
1204 explicitly declared. */
1205 if (DECL_ANTICIPATED (olddecl))
1207 /* Deal with fileptr_type_node. FILE type is not known
1208 at the time we create the builtins. */
1211 for (t1 = TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1212 t2 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1214 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1217 else if (TREE_VALUE (t2) == fileptr_type_node)
1219 tree t = TREE_VALUE (t1);
1221 if (TREE_CODE (t) == POINTER_TYPE
1222 && TYPE_NAME (TREE_TYPE (t))
1223 && DECL_NAME (TYPE_NAME (TREE_TYPE (t)))
1224 == get_identifier ("FILE")
1225 && compparms (TREE_CHAIN (t1), TREE_CHAIN (t2)))
1227 tree oldargs = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1229 TYPE_ARG_TYPES (TREE_TYPE (olddecl))
1230 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1231 types_match = decls_match (newdecl, olddecl);
1233 return duplicate_decls (newdecl, olddecl,
1235 TYPE_ARG_TYPES (TREE_TYPE (olddecl)) = oldargs;
1238 else if (! same_type_p (TREE_VALUE (t1), TREE_VALUE (t2)))
1241 else if ((DECL_EXTERN_C_P (newdecl)
1242 && DECL_EXTERN_C_P (olddecl))
1243 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1244 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1246 /* A near match; override the builtin. */
1248 if (TREE_PUBLIC (newdecl))
1250 warning (0, "new declaration %q#D", newdecl);
1251 warning (0, "ambiguates built-in declaration %q#D",
1255 warning (OPT_Wshadow, "shadowing %s function %q#D",
1256 DECL_BUILT_IN (olddecl) ? "built-in" : "library",
1260 /* Discard the old built-in function. */
1263 /* Replace the old RTL to avoid problems with inlining. */
1264 COPY_DECL_RTL (newdecl, olddecl);
1266 /* Even if the types match, prefer the new declarations type for
1267 built-ins which have not been explicitly declared, for
1268 exception lists, etc... */
1269 else if (DECL_ANTICIPATED (olddecl))
1271 tree type = TREE_TYPE (newdecl);
1272 tree attribs = (*targetm.merge_type_attributes)
1273 (TREE_TYPE (olddecl), type);
1275 type = cp_build_type_attribute_variant (type, attribs);
1276 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = type;
1279 /* If a function is explicitly declared "throw ()", propagate that to
1280 the corresponding builtin. */
1281 if (DECL_BUILT_IN_CLASS (olddecl) == BUILT_IN_NORMAL
1282 && DECL_ANTICIPATED (olddecl)
1283 && TREE_NOTHROW (newdecl)
1284 && !TREE_NOTHROW (olddecl)
1285 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != NULL_TREE
1286 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != olddecl
1288 TREE_NOTHROW (built_in_decls [DECL_FUNCTION_CODE (olddecl)]) = 1;
1290 /* Whether or not the builtin can throw exceptions has no
1291 bearing on this declarator. */
1292 TREE_NOTHROW (olddecl) = 0;
1294 if (DECL_THIS_STATIC (newdecl) && !DECL_THIS_STATIC (olddecl))
1296 /* If a builtin function is redeclared as `static', merge
1297 the declarations, but make the original one static. */
1298 DECL_THIS_STATIC (olddecl) = 1;
1299 TREE_PUBLIC (olddecl) = 0;
1301 /* Make the old declaration consistent with the new one so
1302 that all remnants of the builtin-ness of this function
1303 will be banished. */
1304 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1305 COPY_DECL_RTL (newdecl, olddecl);
1308 else if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1310 /* C++ Standard, 3.3, clause 4:
1311 "[Note: a namespace name or a class template name must be unique
1312 in its declarative region (7.3.2, clause 14). ]" */
1313 if (TREE_CODE (olddecl) != NAMESPACE_DECL
1314 && TREE_CODE (newdecl) != NAMESPACE_DECL
1315 && (TREE_CODE (olddecl) != TEMPLATE_DECL
1316 || TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) != TYPE_DECL)
1317 && (TREE_CODE (newdecl) != TEMPLATE_DECL
1318 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != TYPE_DECL))
1320 if ((TREE_CODE (olddecl) == TYPE_DECL && DECL_ARTIFICIAL (olddecl)
1321 && TREE_CODE (newdecl) != TYPE_DECL)
1322 || (TREE_CODE (newdecl) == TYPE_DECL && DECL_ARTIFICIAL (newdecl)
1323 && TREE_CODE (olddecl) != TYPE_DECL))
1325 /* We do nothing special here, because C++ does such nasty
1326 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1327 get shadowed, and know that if we need to find a TYPE_DECL
1328 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1329 slot of the identifier. */
1333 if ((TREE_CODE (newdecl) == FUNCTION_DECL
1334 && DECL_FUNCTION_TEMPLATE_P (olddecl))
1335 || (TREE_CODE (olddecl) == FUNCTION_DECL
1336 && DECL_FUNCTION_TEMPLATE_P (newdecl)))
1340 error ("%q#D redeclared as different kind of symbol", newdecl);
1341 if (TREE_CODE (olddecl) == TREE_LIST)
1342 olddecl = TREE_VALUE (olddecl);
1343 error ("previous declaration of %q+#D", olddecl);
1345 return error_mark_node;
1347 else if (!types_match)
1349 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
1350 /* These are certainly not duplicate declarations; they're
1351 from different scopes. */
1354 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1356 /* The name of a class template may not be declared to refer to
1357 any other template, class, function, object, namespace, value,
1358 or type in the same scope. */
1359 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == TYPE_DECL
1360 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1362 error ("declaration of template %q#D", newdecl);
1363 error ("conflicts with previous declaration %q+#D", olddecl);
1365 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == FUNCTION_DECL
1366 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == FUNCTION_DECL
1367 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl))),
1368 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl))))
1369 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1370 DECL_TEMPLATE_PARMS (olddecl))
1371 /* Template functions can be disambiguated by
1373 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl)),
1374 TREE_TYPE (TREE_TYPE (olddecl))))
1376 error ("new declaration %q#D", newdecl);
1377 error ("ambiguates old declaration %q+#D", olddecl);
1381 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1383 if (DECL_EXTERN_C_P (newdecl) && DECL_EXTERN_C_P (olddecl))
1385 error ("declaration of C function %q#D conflicts with",
1387 error ("previous declaration %q+#D here", olddecl);
1389 else if (compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1390 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1392 error ("new declaration %q#D", newdecl);
1393 error ("ambiguates old declaration %q+#D", olddecl);
1394 return error_mark_node;
1401 error ("conflicting declaration %q#D", newdecl);
1402 error ("%q+D has a previous declaration as %q#D", olddecl, olddecl);
1403 return error_mark_node;
1406 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1407 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1408 && (!DECL_TEMPLATE_INFO (newdecl)
1409 || (DECL_TI_TEMPLATE (newdecl)
1410 != DECL_TI_TEMPLATE (olddecl))))
1411 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1412 && (!DECL_TEMPLATE_INFO (olddecl)
1413 || (DECL_TI_TEMPLATE (olddecl)
1414 != DECL_TI_TEMPLATE (newdecl))))))
1415 /* It's OK to have a template specialization and a non-template
1416 with the same type, or to have specializations of two
1417 different templates with the same type. Note that if one is a
1418 specialization, and the other is an instantiation of the same
1419 template, that we do not exit at this point. That situation
1420 can occur if we instantiate a template class, and then
1421 specialize one of its methods. This situation is valid, but
1422 the declarations must be merged in the usual way. */
1424 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1425 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1426 && !DECL_USE_TEMPLATE (newdecl))
1427 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1428 && !DECL_USE_TEMPLATE (olddecl))))
1429 /* One of the declarations is a template instantiation, and the
1430 other is not a template at all. That's OK. */
1432 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1434 /* In [namespace.alias] we have:
1436 In a declarative region, a namespace-alias-definition can be
1437 used to redefine a namespace-alias declared in that declarative
1438 region to refer only to the namespace to which it already
1441 Therefore, if we encounter a second alias directive for the same
1442 alias, we can just ignore the second directive. */
1443 if (DECL_NAMESPACE_ALIAS (newdecl)
1444 && (DECL_NAMESPACE_ALIAS (newdecl)
1445 == DECL_NAMESPACE_ALIAS (olddecl)))
1447 /* [namespace.alias]
1449 A namespace-name or namespace-alias shall not be declared as
1450 the name of any other entity in the same declarative region.
1451 A namespace-name defined at global scope shall not be
1452 declared as the name of any other entity in any global scope
1454 error ("declaration of namespace %qD conflicts with", newdecl);
1455 error ("previous declaration of namespace %q+D here", olddecl);
1456 return error_mark_node;
1460 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1463 error (errmsg, newdecl);
1464 if (DECL_NAME (olddecl) != NULL_TREE)
1465 error ((DECL_INITIAL (olddecl) && namespace_bindings_p ())
1466 ? "%q+#D previously defined here"
1467 : "%q+#D previously declared here", olddecl);
1468 return error_mark_node;
1470 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1471 && DECL_INITIAL (olddecl) != NULL_TREE
1472 && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) == NULL_TREE
1473 && TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != NULL_TREE)
1475 /* Prototype decl follows defn w/o prototype. */
1476 warning (0, "prototype for %q+#D", newdecl);
1477 warning (0, "%Jfollows non-prototype definition here", olddecl);
1479 else if ((TREE_CODE (olddecl) == FUNCTION_DECL
1480 || TREE_CODE (olddecl) == VAR_DECL)
1481 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1484 If two declarations of the same function or object
1485 specify different linkage-specifications ..., the program
1486 is ill-formed.... Except for functions with C++ linkage,
1487 a function declaration without a linkage specification
1488 shall not precede the first linkage specification for
1489 that function. A function can be declared without a
1490 linkage specification after an explicit linkage
1491 specification has been seen; the linkage explicitly
1492 specified in the earlier declaration is not affected by
1493 such a function declaration.
1495 DR 563 raises the question why the restrictions on
1496 functions should not also apply to objects. Older
1497 versions of G++ silently ignore the linkage-specification
1505 which is clearly wrong. Therefore, we now treat objects
1507 if (current_lang_depth () == 0)
1509 /* There is no explicit linkage-specification, so we use
1510 the linkage from the previous declaration. */
1511 if (!DECL_LANG_SPECIFIC (newdecl))
1512 retrofit_lang_decl (newdecl);
1513 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1517 error ("previous declaration of %q+#D with %qL linkage",
1518 olddecl, DECL_LANGUAGE (olddecl));
1519 error ("conflicts with new declaration with %qL linkage",
1520 DECL_LANGUAGE (newdecl));
1524 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1526 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1528 tree t1 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1529 tree t2 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1532 if (TREE_CODE (TREE_TYPE (newdecl)) == METHOD_TYPE)
1533 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2);
1535 for (; t1 && t1 != void_list_node;
1536 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1537 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1539 if (1 == simple_cst_equal (TREE_PURPOSE (t1),
1542 permerror (input_location, "default argument given for parameter %d of %q#D",
1544 permerror (input_location, "after previous specification in %q+#D", olddecl);
1548 error ("default argument given for parameter %d of %q#D",
1550 error ("after previous specification in %q+#D",
1557 /* Do not merge an implicit typedef with an explicit one. In:
1561 typedef class A A __attribute__ ((foo));
1563 the attribute should apply only to the typedef. */
1564 if (TREE_CODE (olddecl) == TYPE_DECL
1565 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1566 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1569 /* If new decl is `static' and an `extern' was seen previously,
1571 warn_extern_redeclared_static (newdecl, olddecl);
1573 /* We have committed to returning 1 at this point. */
1574 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1576 /* Now that functions must hold information normally held
1577 by field decls, there is extra work to do so that
1578 declaration information does not get destroyed during
1580 if (DECL_VINDEX (olddecl))
1581 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1582 if (DECL_CONTEXT (olddecl))
1583 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1584 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1585 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1586 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1587 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1588 DECL_INVALID_OVERRIDER_P (newdecl) |= DECL_INVALID_OVERRIDER_P (olddecl);
1589 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1590 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1591 SET_OVERLOADED_OPERATOR_CODE
1592 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1593 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1595 /* Optionally warn about more than one declaration for the same
1596 name, but don't warn about a function declaration followed by a
1598 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1599 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1600 /* Don't warn about extern decl followed by definition. */
1601 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1602 /* Don't warn about friends, let add_friend take care of it. */
1603 && ! (newdecl_is_friend || DECL_FRIEND_P (olddecl)))
1605 warning (OPT_Wredundant_decls, "redundant redeclaration of %qD in same scope", newdecl);
1606 warning (OPT_Wredundant_decls, "previous declaration of %q+D", olddecl);
1609 if (DECL_DELETED_FN (newdecl))
1611 error ("deleted definition of %qD", newdecl);
1612 error ("after previous declaration %q+D", olddecl);
1616 /* Deal with C++: must preserve virtual function table size. */
1617 if (TREE_CODE (olddecl) == TYPE_DECL)
1619 tree newtype = TREE_TYPE (newdecl);
1620 tree oldtype = TREE_TYPE (olddecl);
1622 if (newtype != error_mark_node && oldtype != error_mark_node
1623 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1624 CLASSTYPE_FRIEND_CLASSES (newtype)
1625 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1627 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1630 /* Copy all the DECL_... slots specified in the new decl
1631 except for any that we copy here from the old type. */
1632 DECL_ATTRIBUTES (newdecl)
1633 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1635 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1639 old_result = DECL_TEMPLATE_RESULT (olddecl);
1640 new_result = DECL_TEMPLATE_RESULT (newdecl);
1641 TREE_TYPE (olddecl) = TREE_TYPE (old_result);
1642 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1643 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1644 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1646 DECL_ATTRIBUTES (old_result)
1647 = (*targetm.merge_decl_attributes) (old_result, new_result);
1649 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1651 if (GNU_INLINE_P (old_result) != GNU_INLINE_P (new_result)
1652 && DECL_INITIAL (new_result))
1654 if (DECL_INITIAL (old_result))
1655 DECL_UNINLINABLE (old_result) = 1;
1657 DECL_UNINLINABLE (old_result) = DECL_UNINLINABLE (new_result);
1658 DECL_EXTERNAL (old_result) = DECL_EXTERNAL (new_result);
1659 DECL_NOT_REALLY_EXTERN (old_result)
1660 = DECL_NOT_REALLY_EXTERN (new_result);
1661 DECL_INTERFACE_KNOWN (old_result)
1662 = DECL_INTERFACE_KNOWN (new_result);
1663 DECL_DECLARED_INLINE_P (old_result)
1664 = DECL_DECLARED_INLINE_P (new_result);
1665 DECL_DISREGARD_INLINE_LIMITS (old_result)
1666 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1671 DECL_DECLARED_INLINE_P (old_result)
1672 |= DECL_DECLARED_INLINE_P (new_result);
1673 DECL_DISREGARD_INLINE_LIMITS (old_result)
1674 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1675 check_redeclaration_exception_specification (newdecl, olddecl);
1679 /* If the new declaration is a definition, update the file and
1680 line information on the declaration, and also make
1681 the old declaration the same definition. */
1682 if (DECL_INITIAL (new_result) != NULL_TREE)
1684 DECL_SOURCE_LOCATION (olddecl)
1685 = DECL_SOURCE_LOCATION (old_result)
1686 = DECL_SOURCE_LOCATION (newdecl);
1687 DECL_INITIAL (old_result) = DECL_INITIAL (new_result);
1688 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1689 DECL_ARGUMENTS (old_result)
1690 = DECL_ARGUMENTS (new_result);
1698 /* Automatically handles default parameters. */
1699 tree oldtype = TREE_TYPE (olddecl);
1702 /* Merge the data types specified in the two decls. */
1703 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1705 /* If merge_types produces a non-typedef type, just use the old type. */
1706 if (TREE_CODE (newdecl) == TYPE_DECL
1707 && newtype == DECL_ORIGINAL_TYPE (newdecl))
1710 if (TREE_CODE (newdecl) == VAR_DECL)
1712 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
1713 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
1714 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl)
1715 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl);
1716 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
1717 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
1719 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
1720 if (DECL_LANG_SPECIFIC (olddecl)
1721 && CP_DECL_THREADPRIVATE_P (olddecl))
1723 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
1724 if (!DECL_LANG_SPECIFIC (newdecl))
1725 retrofit_lang_decl (newdecl);
1727 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
1728 CP_DECL_THREADPRIVATE_P (newdecl) = 1;
1732 /* Do this after calling `merge_types' so that default
1733 parameters don't confuse us. */
1734 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1735 check_redeclaration_exception_specification (newdecl, olddecl);
1736 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
1738 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1739 check_default_args (newdecl);
1741 /* Lay the type out, unless already done. */
1742 if (! same_type_p (newtype, oldtype)
1743 && TREE_TYPE (newdecl) != error_mark_node
1744 && !(processing_template_decl && uses_template_parms (newdecl)))
1745 layout_type (TREE_TYPE (newdecl));
1747 if ((TREE_CODE (newdecl) == VAR_DECL
1748 || TREE_CODE (newdecl) == PARM_DECL
1749 || TREE_CODE (newdecl) == RESULT_DECL
1750 || TREE_CODE (newdecl) == FIELD_DECL
1751 || TREE_CODE (newdecl) == TYPE_DECL)
1752 && !(processing_template_decl && uses_template_parms (newdecl)))
1753 layout_decl (newdecl, 0);
1755 /* Merge the type qualifiers. */
1756 if (TREE_READONLY (newdecl))
1757 TREE_READONLY (olddecl) = 1;
1758 if (TREE_THIS_VOLATILE (newdecl))
1759 TREE_THIS_VOLATILE (olddecl) = 1;
1760 if (TREE_NOTHROW (newdecl))
1761 TREE_NOTHROW (olddecl) = 1;
1763 /* Merge deprecatedness. */
1764 if (TREE_DEPRECATED (newdecl))
1765 TREE_DEPRECATED (olddecl) = 1;
1767 /* Merge the initialization information. */
1768 if (DECL_INITIAL (newdecl) == NULL_TREE
1769 && DECL_INITIAL (olddecl) != NULL_TREE)
1771 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1772 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1773 if (CAN_HAVE_FULL_LANG_DECL_P (newdecl)
1774 && DECL_LANG_SPECIFIC (newdecl)
1775 && DECL_LANG_SPECIFIC (olddecl))
1777 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1778 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1782 /* Merge the section attribute.
1783 We want to issue an error if the sections conflict but that must be
1784 done later in decl_attributes since we are called before attributes
1786 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1787 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1789 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1791 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1792 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1793 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1794 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1795 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
1796 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1797 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
1798 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
1799 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1800 DECL_LOOPING_CONST_OR_PURE_P (newdecl)
1801 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl);
1802 /* Keep the old RTL. */
1803 COPY_DECL_RTL (olddecl, newdecl);
1805 else if (TREE_CODE (newdecl) == VAR_DECL
1806 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
1808 /* Keep the old RTL. We cannot keep the old RTL if the old
1809 declaration was for an incomplete object and the new
1810 declaration is not since many attributes of the RTL will
1812 COPY_DECL_RTL (olddecl, newdecl);
1815 /* If cannot merge, then use the new type and qualifiers,
1816 and don't preserve the old rtl. */
1819 /* Clean out any memory we had of the old declaration. */
1820 tree oldstatic = value_member (olddecl, static_aggregates);
1822 TREE_VALUE (oldstatic) = error_mark_node;
1824 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1825 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1826 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1827 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1830 /* Merge the storage class information. */
1831 merge_weak (newdecl, olddecl);
1833 DECL_ONE_ONLY (newdecl) |= DECL_ONE_ONLY (olddecl);
1834 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
1835 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1836 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
1837 if (! DECL_EXTERNAL (olddecl))
1838 DECL_EXTERNAL (newdecl) = 0;
1840 new_template = NULL_TREE;
1841 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
1843 bool new_redefines_gnu_inline = false;
1845 if (new_defines_function
1846 && ((DECL_INTERFACE_KNOWN (olddecl)
1847 && TREE_CODE (olddecl) == FUNCTION_DECL)
1848 || (TREE_CODE (olddecl) == TEMPLATE_DECL
1849 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
1850 == FUNCTION_DECL))))
1854 if (TREE_CODE (fn) == TEMPLATE_DECL)
1855 fn = DECL_TEMPLATE_RESULT (olddecl);
1857 new_redefines_gnu_inline = GNU_INLINE_P (fn) && DECL_INITIAL (fn);
1860 if (!new_redefines_gnu_inline)
1862 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
1863 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
1864 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
1866 DECL_TEMPLATE_INSTANTIATED (newdecl)
1867 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
1869 /* If the OLDDECL is an instantiation and/or specialization,
1870 then the NEWDECL must be too. But, it may not yet be marked
1871 as such if the caller has created NEWDECL, but has not yet
1872 figured out that it is a redeclaration. */
1873 if (!DECL_USE_TEMPLATE (newdecl))
1874 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
1876 /* Don't really know how much of the language-specific
1877 values we should copy from old to new. */
1878 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
1879 DECL_LANG_SPECIFIC (newdecl)->decl_flags.u2 =
1880 DECL_LANG_SPECIFIC (olddecl)->decl_flags.u2;
1881 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
1882 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
1883 if (DECL_TEMPLATE_INFO (newdecl))
1884 new_template = DECL_TI_TEMPLATE (newdecl);
1885 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
1886 DECL_INITIALIZED_IN_CLASS_P (newdecl)
1887 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
1888 olddecl_friend = DECL_FRIEND_P (olddecl);
1889 hidden_friend = (DECL_ANTICIPATED (olddecl)
1890 && DECL_HIDDEN_FRIEND_P (olddecl)
1891 && newdecl_is_friend);
1893 /* Only functions have DECL_BEFRIENDING_CLASSES. */
1894 if (TREE_CODE (newdecl) == FUNCTION_DECL
1895 || DECL_FUNCTION_TEMPLATE_P (newdecl))
1897 DECL_BEFRIENDING_CLASSES (newdecl)
1898 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
1899 DECL_BEFRIENDING_CLASSES (olddecl));
1900 /* DECL_THUNKS is only valid for virtual functions,
1901 otherwise it is a DECL_FRIEND_CONTEXT. */
1902 if (DECL_VIRTUAL_P (newdecl))
1903 DECL_THUNKS (newdecl) = DECL_THUNKS (olddecl);
1907 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1909 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
1910 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
1912 /* If newdecl is not a specialization, then it is not a
1913 template-related function at all. And that means that we
1914 should have exited above, returning 0. */
1915 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
1917 if (TREE_USED (olddecl))
1918 /* From [temp.expl.spec]:
1920 If a template, a member template or the member of a class
1921 template is explicitly specialized then that
1922 specialization shall be declared before the first use of
1923 that specialization that would cause an implicit
1924 instantiation to take place, in every translation unit in
1925 which such a use occurs. */
1926 error ("explicit specialization of %qD after first use",
1929 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
1931 /* Don't propagate visibility from the template to the
1932 specialization here. We'll do that in determine_visibility if
1934 DECL_VISIBILITY_SPECIFIED (olddecl) = 0;
1936 /* [temp.expl.spec/14] We don't inline explicit specialization
1937 just because the primary template says so. */
1939 else if (new_defines_function && DECL_INITIAL (olddecl))
1941 /* Never inline re-defined extern inline functions.
1942 FIXME: this could be better handled by keeping both
1943 function as separate declarations. */
1944 DECL_UNINLINABLE (newdecl) = 1;
1948 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
1949 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
1951 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
1953 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1954 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1956 DECL_DISREGARD_INLINE_LIMITS (newdecl)
1957 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
1958 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
1959 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
1962 /* Preserve abstractness on cloned [cd]tors. */
1963 DECL_ABSTRACT (newdecl) = DECL_ABSTRACT (olddecl);
1967 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1968 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
1969 COPY_DECL_RTL (newdecl, olddecl);
1971 if (! types_match || new_defines_function)
1973 /* These need to be copied so that the names are available.
1974 Note that if the types do match, we'll preserve inline
1975 info and other bits, but if not, we won't. */
1976 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
1977 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
1979 if (new_defines_function)
1980 /* If defining a function declared with other language
1981 linkage, use the previously declared language linkage. */
1982 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1983 else if (types_match)
1985 /* If redeclaring a builtin function, and not a definition,
1986 it stays built in. */
1987 if (DECL_BUILT_IN (olddecl))
1989 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1990 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1991 /* If we're keeping the built-in definition, keep the rtl,
1992 regardless of declaration matches. */
1993 COPY_DECL_RTL (olddecl, newdecl);
1996 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1997 /* Don't clear out the arguments if we're redefining a function. */
1998 if (DECL_ARGUMENTS (olddecl))
1999 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2002 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
2003 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
2005 /* Now preserve various other info from the definition. */
2006 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
2007 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
2008 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2009 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2011 /* Warn about conflicting visibility specifications. */
2012 if (DECL_VISIBILITY_SPECIFIED (olddecl)
2013 && DECL_VISIBILITY_SPECIFIED (newdecl)
2014 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2016 warning (OPT_Wattributes, "%q+D: visibility attribute ignored "
2017 "because it", newdecl);
2018 warning (OPT_Wattributes, "%Jconflicts with previous "
2019 "declaration here", olddecl);
2021 /* Choose the declaration which specified visibility. */
2022 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2024 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2025 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2027 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2028 so keep this behavior. */
2029 if (TREE_CODE (newdecl) == VAR_DECL && DECL_HAS_INIT_PRIORITY_P (newdecl))
2031 SET_DECL_INIT_PRIORITY (olddecl, DECL_INIT_PRIORITY (newdecl));
2032 DECL_HAS_INIT_PRIORITY_P (olddecl) = 1;
2035 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2036 with that from NEWDECL below. */
2037 if (DECL_LANG_SPECIFIC (olddecl))
2039 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
2040 != DECL_LANG_SPECIFIC (newdecl));
2041 ggc_free (DECL_LANG_SPECIFIC (olddecl));
2044 /* Merge the USED information. */
2045 if (TREE_USED (olddecl))
2046 TREE_USED (newdecl) = 1;
2047 else if (TREE_USED (newdecl))
2048 TREE_USED (olddecl) = 1;
2050 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2054 function_size = sizeof (struct tree_decl_common);
2056 memcpy ((char *) olddecl + sizeof (struct tree_common),
2057 (char *) newdecl + sizeof (struct tree_common),
2058 function_size - sizeof (struct tree_common));
2060 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2061 (char *) newdecl + sizeof (struct tree_decl_common),
2062 sizeof (struct tree_function_decl) - sizeof (struct tree_decl_common));
2064 /* If newdecl is a template instantiation, it is possible that
2065 the following sequence of events has occurred:
2067 o A friend function was declared in a class template. The
2068 class template was instantiated.
2070 o The instantiation of the friend declaration was
2071 recorded on the instantiation list, and is newdecl.
2073 o Later, however, instantiate_class_template called pushdecl
2074 on the newdecl to perform name injection. But, pushdecl in
2075 turn called duplicate_decls when it discovered that another
2076 declaration of a global function with the same name already
2079 o Here, in duplicate_decls, we decided to clobber newdecl.
2081 If we're going to do that, we'd better make sure that
2082 olddecl, and not newdecl, is on the list of
2083 instantiations so that if we try to do the instantiation
2084 again we won't get the clobbered declaration. */
2085 reregister_specialization (newdecl,
2091 size_t size = tree_code_size (TREE_CODE (olddecl));
2092 memcpy ((char *) olddecl + sizeof (struct tree_common),
2093 (char *) newdecl + sizeof (struct tree_common),
2094 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2095 switch (TREE_CODE (olddecl))
2105 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2106 (char *) newdecl + sizeof (struct tree_decl_common),
2107 size - sizeof (struct tree_decl_common)
2108 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2112 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2113 (char *) newdecl + sizeof (struct tree_decl_common),
2114 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)
2115 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2119 DECL_UID (olddecl) = olddecl_uid;
2121 DECL_FRIEND_P (olddecl) = 1;
2124 DECL_ANTICIPATED (olddecl) = 1;
2125 DECL_HIDDEN_FRIEND_P (olddecl) = 1;
2128 /* NEWDECL contains the merged attribute lists.
2129 Update OLDDECL to be the same. */
2130 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2132 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2133 so that encode_section_info has a chance to look at the new decl
2134 flags and attributes. */
2135 if (DECL_RTL_SET_P (olddecl)
2136 && (TREE_CODE (olddecl) == FUNCTION_DECL
2137 || (TREE_CODE (olddecl) == VAR_DECL
2138 && TREE_STATIC (olddecl))))
2139 make_decl_rtl (olddecl);
2141 /* The NEWDECL will no longer be needed. Because every out-of-class
2142 declaration of a member results in a call to duplicate_decls,
2143 freeing these nodes represents in a significant savings. */
2149 /* Return zero if the declaration NEWDECL is valid
2150 when the declaration OLDDECL (assumed to be for the same name)
2151 has already been seen.
2152 Otherwise return an error message format string with a %s
2153 where the identifier should go. */
2156 redeclaration_error_message (tree newdecl, tree olddecl)
2158 if (TREE_CODE (newdecl) == TYPE_DECL)
2160 /* Because C++ can put things into name space for free,
2161 constructs like "typedef struct foo { ... } foo"
2162 would look like an erroneous redeclaration. */
2163 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
2166 return "redefinition of %q#D";
2168 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2170 /* If this is a pure function, its olddecl will actually be
2171 the original initialization to `0' (which we force to call
2172 abort()). Don't complain about redefinition in this case. */
2173 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
2174 && DECL_INITIAL (olddecl) == NULL_TREE)
2177 /* If both functions come from different namespaces, this is not
2178 a redeclaration - this is a conflict with a used function. */
2179 if (DECL_NAMESPACE_SCOPE_P (olddecl)
2180 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
2181 && ! decls_match (olddecl, newdecl))
2182 return "%qD conflicts with used function";
2184 /* We'll complain about linkage mismatches in
2185 warn_extern_redeclared_static. */
2187 /* Defining the same name twice is no good. */
2188 if (DECL_INITIAL (olddecl) != NULL_TREE
2189 && DECL_INITIAL (newdecl) != NULL_TREE)
2191 if (DECL_NAME (olddecl) == NULL_TREE)
2192 return "%q#D not declared in class";
2193 else if (!GNU_INLINE_P (olddecl)
2194 || GNU_INLINE_P (newdecl))
2195 return "redefinition of %q#D";
2198 if (DECL_DECLARED_INLINE_P (olddecl) && DECL_DECLARED_INLINE_P (newdecl))
2200 bool olda = GNU_INLINE_P (olddecl);
2201 bool newa = GNU_INLINE_P (newdecl);
2206 return "%q+D redeclared inline with %<gnu_inline%> attribute";
2208 return "%q+D redeclared inline without %<gnu_inline%> attribute";
2214 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
2218 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
2220 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
2221 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
2222 return "redefinition of %q#D";
2226 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
2227 || (DECL_TEMPLATE_RESULT (newdecl)
2228 == DECL_TEMPLATE_RESULT (olddecl)))
2231 nt = DECL_TEMPLATE_RESULT (newdecl);
2232 if (DECL_TEMPLATE_INFO (nt))
2233 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
2234 ot = DECL_TEMPLATE_RESULT (olddecl);
2235 if (DECL_TEMPLATE_INFO (ot))
2236 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
2237 if (DECL_INITIAL (nt) && DECL_INITIAL (ot)
2238 && (!GNU_INLINE_P (ot) || GNU_INLINE_P (nt)))
2239 return "redefinition of %q#D";
2241 if (DECL_DECLARED_INLINE_P (ot) && DECL_DECLARED_INLINE_P (nt))
2243 bool olda = GNU_INLINE_P (ot);
2244 bool newa = GNU_INLINE_P (nt);
2249 return "%q+D redeclared inline with %<gnu_inline%> attribute";
2251 return "%q+D redeclared inline without %<gnu_inline%> attribute";
2255 /* Core issue #226 (C++0x):
2257 If a friend function template declaration specifies a
2258 default template-argument, that declaration shall be a
2259 definition and shall be the only declaration of the
2260 function template in the translation unit. */
2261 if ((cxx_dialect != cxx98)
2262 && TREE_CODE (ot) == FUNCTION_DECL && DECL_FRIEND_P (ot)
2263 && !check_default_tmpl_args (nt, DECL_TEMPLATE_PARMS (newdecl),
2264 /*is_primary=*/1, /*is_partial=*/0,
2265 /*is_friend_decl=*/2))
2266 return "redeclaration of friend %q#D may not have default template arguments";
2270 else if (TREE_CODE (newdecl) == VAR_DECL
2271 && DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl)
2272 && (! DECL_LANG_SPECIFIC (olddecl)
2273 || ! CP_DECL_THREADPRIVATE_P (olddecl)
2274 || DECL_THREAD_LOCAL_P (newdecl)))
2276 /* Only variables can be thread-local, and all declarations must
2277 agree on this property. */
2278 if (DECL_THREAD_LOCAL_P (newdecl))
2279 return "thread-local declaration of %q#D follows "
2280 "non-thread-local declaration";
2282 return "non-thread-local declaration of %q#D follows "
2283 "thread-local declaration";
2285 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2287 /* The objects have been declared at namespace scope. If either
2288 is a member of an anonymous union, then this is an invalid
2289 redeclaration. For example:
2295 if ((TREE_CODE (newdecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (newdecl))
2296 || (TREE_CODE (olddecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (olddecl)))
2297 return "redeclaration of %q#D";
2298 /* If at least one declaration is a reference, there is no
2299 conflict. For example:
2305 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2307 /* Reject two definitions. */
2308 return "redefinition of %q#D";
2312 /* Objects declared with block scope: */
2313 /* Reject two definitions, and reject a definition
2314 together with an external reference. */
2315 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2316 return "redeclaration of %q#D";
2321 /* Hash and equality functions for the named_label table. */
2324 named_label_entry_hash (const void *data)
2326 const struct named_label_entry *ent = (const struct named_label_entry *) data;
2327 return DECL_UID (ent->label_decl);
2331 named_label_entry_eq (const void *a, const void *b)
2333 const struct named_label_entry *ent_a = (const struct named_label_entry *) a;
2334 const struct named_label_entry *ent_b = (const struct named_label_entry *) b;
2335 return ent_a->label_decl == ent_b->label_decl;
2338 /* Create a new label, named ID. */
2341 make_label_decl (tree id, int local_p)
2343 struct named_label_entry *ent;
2347 decl = build_decl (LABEL_DECL, id, void_type_node);
2349 DECL_CONTEXT (decl) = current_function_decl;
2350 DECL_MODE (decl) = VOIDmode;
2351 C_DECLARED_LABEL_FLAG (decl) = local_p;
2353 /* Say where one reference is to the label, for the sake of the
2354 error if it is not defined. */
2355 DECL_SOURCE_LOCATION (decl) = input_location;
2357 /* Record the fact that this identifier is bound to this label. */
2358 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2360 /* Create the label htab for the function on demand. */
2362 named_labels = htab_create_ggc (13, named_label_entry_hash,
2363 named_label_entry_eq, NULL);
2365 /* Record this label on the list of labels used in this function.
2366 We do this before calling make_label_decl so that we get the
2367 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2368 ent = GGC_CNEW (struct named_label_entry);
2369 ent->label_decl = decl;
2371 slot = htab_find_slot (named_labels, ent, INSERT);
2372 gcc_assert (*slot == NULL);
2378 /* Look for a label named ID in the current function. If one cannot
2379 be found, create one. (We keep track of used, but undefined,
2380 labels, and complain about them at the end of a function.) */
2383 lookup_label (tree id)
2387 timevar_push (TV_NAME_LOOKUP);
2388 /* You can't use labels at global scope. */
2389 if (current_function_decl == NULL_TREE)
2391 error ("label %qE referenced outside of any function", id);
2392 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, NULL_TREE);
2395 /* See if we've already got this label. */
2396 decl = IDENTIFIER_LABEL_VALUE (id);
2397 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2398 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2400 decl = make_label_decl (id, /*local_p=*/0);
2401 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2404 /* Declare a local label named ID. */
2407 declare_local_label (tree id)
2411 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2412 this scope we can restore the old value of IDENTIFIER_TYPE_VALUE. */
2413 shadow = tree_cons (IDENTIFIER_LABEL_VALUE (id), NULL_TREE,
2414 current_binding_level->shadowed_labels);
2415 current_binding_level->shadowed_labels = shadow;
2417 decl = make_label_decl (id, /*local_p=*/1);
2418 TREE_VALUE (shadow) = decl;
2423 /* Returns nonzero if it is ill-formed to jump past the declaration of
2424 DECL. Returns 2 if it's also a real problem. */
2427 decl_jump_unsafe (tree decl)
2429 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl)
2430 || TREE_TYPE (decl) == error_mark_node)
2433 if (TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))
2434 || DECL_NONTRIVIALLY_INITIALIZED_P (decl))
2437 if (pod_type_p (TREE_TYPE (decl)))
2440 /* The POD stuff is just pedantry; why should it matter if the class
2441 contains a field of pointer to member type? */
2445 /* A subroutine of check_previous_goto_1 to identify a branch to the user. */
2448 identify_goto (tree decl, const location_t *locus)
2451 permerror (input_location, "jump to label %qD", decl);
2453 permerror (input_location, "jump to case label");
2455 permerror (input_location, "%H from here", locus);
2458 /* Check that a single previously seen jump to a newly defined label
2459 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2460 the jump context; NAMES are the names in scope in LEVEL at the jump
2461 context; LOCUS is the source position of the jump or 0. Returns
2462 true if all is well. */
2465 check_previous_goto_1 (tree decl, struct cp_binding_level* level, tree names,
2466 bool exited_omp, const location_t *locus)
2468 struct cp_binding_level *b;
2469 bool identified = false, saw_eh = false, saw_omp = false;
2473 identify_goto (decl, locus);
2474 error (" exits OpenMP structured block");
2475 identified = saw_omp = true;
2478 for (b = current_binding_level; b ; b = b->level_chain)
2480 tree new_decls, old_decls = (b == level ? names : NULL_TREE);
2482 for (new_decls = b->names; new_decls != old_decls;
2483 new_decls = TREE_CHAIN (new_decls))
2485 int problem = decl_jump_unsafe (new_decls);
2491 identify_goto (decl, locus);
2495 error (" crosses initialization of %q+#D", new_decls);
2497 permerror (input_location, " enters scope of non-POD %q+#D", new_decls);
2502 if ((b->kind == sk_try || b->kind == sk_catch) && !saw_eh)
2506 identify_goto (decl, locus);
2509 if (b->kind == sk_try)
2510 error (" enters try block");
2512 error (" enters catch block");
2515 if (b->kind == sk_omp && !saw_omp)
2519 identify_goto (decl, locus);
2522 error (" enters OpenMP structured block");
2531 check_previous_goto (tree decl, struct named_label_use_entry *use)
2533 check_previous_goto_1 (decl, use->binding_level,
2534 use->names_in_scope, use->in_omp_scope,
2535 &use->o_goto_locus);
2539 check_switch_goto (struct cp_binding_level* level)
2541 return check_previous_goto_1 (NULL_TREE, level, level->names, false, NULL);
2544 /* Check that a new jump to a label DECL is OK. Called by
2545 finish_goto_stmt. */
2548 check_goto (tree decl)
2550 struct named_label_entry *ent, dummy;
2551 bool saw_catch = false, identified = false;
2554 /* We can't know where a computed goto is jumping.
2555 So we assume that it's OK. */
2556 if (TREE_CODE (decl) != LABEL_DECL)
2559 /* We didn't record any information about this label when we created it,
2560 and there's not much point since it's trivial to analyze as a return. */
2561 if (decl == cdtor_label)
2564 dummy.label_decl = decl;
2565 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2566 gcc_assert (ent != NULL);
2568 /* If the label hasn't been defined yet, defer checking. */
2569 if (! DECL_INITIAL (decl))
2571 struct named_label_use_entry *new_use;
2573 /* Don't bother creating another use if the last goto had the
2574 same data, and will therefore create the same set of errors. */
2576 && ent->uses->names_in_scope == current_binding_level->names)
2579 new_use = GGC_NEW (struct named_label_use_entry);
2580 new_use->binding_level = current_binding_level;
2581 new_use->names_in_scope = current_binding_level->names;
2582 new_use->o_goto_locus = input_location;
2583 new_use->in_omp_scope = false;
2585 new_use->next = ent->uses;
2586 ent->uses = new_use;
2590 if (ent->in_try_scope || ent->in_catch_scope
2591 || ent->in_omp_scope || ent->bad_decls)
2593 permerror (input_location, "jump to label %q+D", decl);
2594 permerror (input_location, " from here");
2598 for (bad = ent->bad_decls; bad; bad = TREE_CHAIN (bad))
2600 tree b = TREE_VALUE (bad);
2601 int u = decl_jump_unsafe (b);
2603 if (u > 1 && DECL_ARTIFICIAL (b))
2605 /* Can't skip init of __exception_info. */
2606 error ("%J enters catch block", b);
2610 error (" skips initialization of %q+#D", b);
2612 permerror (input_location, " enters scope of non-POD %q+#D", b);
2615 if (ent->in_try_scope)
2616 error (" enters try block");
2617 else if (ent->in_catch_scope && !saw_catch)
2618 error (" enters catch block");
2620 if (ent->in_omp_scope)
2621 error (" enters OpenMP structured block");
2622 else if (flag_openmp)
2624 struct cp_binding_level *b;
2625 for (b = current_binding_level; b ; b = b->level_chain)
2627 if (b == ent->binding_level)
2629 if (b->kind == sk_omp)
2633 permerror (input_location, "jump to label %q+D", decl);
2634 permerror (input_location, " from here");
2637 error (" exits OpenMP structured block");
2644 /* Check that a return is ok wrt OpenMP structured blocks.
2645 Called by finish_return_stmt. Returns true if all is well. */
2648 check_omp_return (void)
2650 struct cp_binding_level *b;
2651 for (b = current_binding_level; b ; b = b->level_chain)
2652 if (b->kind == sk_omp)
2654 error ("invalid exit from OpenMP structured block");
2660 /* Define a label, specifying the location in the source file.
2661 Return the LABEL_DECL node for the label. */
2664 define_label (location_t location, tree name)
2666 struct named_label_entry *ent, dummy;
2667 struct cp_binding_level *p;
2670 timevar_push (TV_NAME_LOOKUP);
2672 decl = lookup_label (name);
2674 dummy.label_decl = decl;
2675 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2676 gcc_assert (ent != NULL);
2678 /* After labels, make any new cleanups in the function go into their
2679 own new (temporary) binding contour. */
2680 for (p = current_binding_level;
2681 p->kind != sk_function_parms;
2683 p->more_cleanups_ok = 0;
2685 if (name == get_identifier ("wchar_t"))
2686 permerror (input_location, "label named wchar_t");
2688 if (DECL_INITIAL (decl) != NULL_TREE)
2690 error ("duplicate label %qD", decl);
2691 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
2695 struct named_label_use_entry *use;
2697 /* Mark label as having been defined. */
2698 DECL_INITIAL (decl) = error_mark_node;
2699 /* Say where in the source. */
2700 DECL_SOURCE_LOCATION (decl) = location;
2702 ent->binding_level = current_binding_level;
2703 ent->names_in_scope = current_binding_level->names;
2705 for (use = ent->uses; use ; use = use->next)
2706 check_previous_goto (decl, use);
2710 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2715 struct cp_binding_level *level;
2716 struct cp_switch *next;
2717 /* The SWITCH_STMT being built. */
2719 /* A splay-tree mapping the low element of a case range to the high
2720 element, or NULL_TREE if there is no high element. Used to
2721 determine whether or not a new case label duplicates an old case
2722 label. We need a tree, rather than simply a hash table, because
2723 of the GNU case range extension. */
2727 /* A stack of the currently active switch statements. The innermost
2728 switch statement is on the top of the stack. There is no need to
2729 mark the stack for garbage collection because it is only active
2730 during the processing of the body of a function, and we never
2731 collect at that point. */
2733 static struct cp_switch *switch_stack;
2735 /* Called right after a switch-statement condition is parsed.
2736 SWITCH_STMT is the switch statement being parsed. */
2739 push_switch (tree switch_stmt)
2741 struct cp_switch *p = XNEW (struct cp_switch);
2742 p->level = current_binding_level;
2743 p->next = switch_stack;
2744 p->switch_stmt = switch_stmt;
2745 p->cases = splay_tree_new (case_compare, NULL, NULL);
2752 struct cp_switch *cs = switch_stack;
2753 location_t switch_location;
2755 /* Emit warnings as needed. */
2756 if (EXPR_HAS_LOCATION (cs->switch_stmt))
2757 switch_location = EXPR_LOCATION (cs->switch_stmt);
2759 switch_location = input_location;
2760 if (!processing_template_decl)
2761 c_do_switch_warnings (cs->cases, switch_location,
2762 SWITCH_STMT_TYPE (cs->switch_stmt),
2763 SWITCH_STMT_COND (cs->switch_stmt));
2765 splay_tree_delete (cs->cases);
2766 switch_stack = switch_stack->next;
2770 /* Note that we've seen a definition of a case label, and complain if this
2771 is a bad place for one. */
2774 finish_case_label (tree low_value, tree high_value)
2777 struct cp_binding_level *p;
2779 if (processing_template_decl)
2783 /* For templates, just add the case label; we'll do semantic
2784 analysis at instantiation-time. */
2785 label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
2786 return add_stmt (build_case_label (low_value, high_value, label));
2789 /* Find the condition on which this switch statement depends. */
2790 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
2791 if (cond && TREE_CODE (cond) == TREE_LIST)
2792 cond = TREE_VALUE (cond);
2794 if (!check_switch_goto (switch_stack->level))
2795 return error_mark_node;
2797 r = c_add_case_label (switch_stack->cases, cond, TREE_TYPE (cond),
2798 low_value, high_value);
2800 /* After labels, make any new cleanups in the function go into their
2801 own new (temporary) binding contour. */
2802 for (p = current_binding_level;
2803 p->kind != sk_function_parms;
2805 p->more_cleanups_ok = 0;
2810 /* Hash a TYPENAME_TYPE. K is really of type `tree'. */
2813 typename_hash (const void* k)
2816 const_tree const t = (const_tree) k;
2818 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
2819 ^ htab_hash_pointer (DECL_NAME (TYPE_NAME (t))));
2824 typedef struct typename_info {
2832 /* Compare two TYPENAME_TYPEs. K1 is really of type `tree', K2 is
2833 really of type `typename_info*' */
2836 typename_compare (const void * k1, const void * k2)
2838 const_tree const t1 = (const_tree) k1;
2839 const typename_info *const t2 = (const typename_info *) k2;
2841 return (DECL_NAME (TYPE_NAME (t1)) == t2->name
2842 && TYPE_CONTEXT (t1) == t2->scope
2843 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
2844 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
2845 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
2848 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
2849 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
2851 Returns the new TYPENAME_TYPE. */
2853 static GTY ((param_is (union tree_node))) htab_t typename_htab;
2856 build_typename_type (tree context, tree name, tree fullname,
2857 enum tag_types tag_type)
2865 if (typename_htab == NULL)
2866 typename_htab = htab_create_ggc (61, &typename_hash,
2867 &typename_compare, NULL);
2869 ti.scope = FROB_CONTEXT (context);
2871 ti.template_id = fullname;
2872 ti.enum_p = tag_type == enum_type;
2873 ti.class_p = (tag_type == class_type
2874 || tag_type == record_type
2875 || tag_type == union_type);
2876 hash = (htab_hash_pointer (ti.scope)
2877 ^ htab_hash_pointer (ti.name));
2879 /* See if we already have this type. */
2880 e = htab_find_slot_with_hash (typename_htab, &ti, hash, INSERT);
2885 /* Build the TYPENAME_TYPE. */
2886 t = cxx_make_type (TYPENAME_TYPE);
2887 TYPE_CONTEXT (t) = ti.scope;
2888 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
2889 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
2890 TYPENAME_IS_CLASS_P (t) = ti.class_p;
2892 /* Build the corresponding TYPE_DECL. */
2893 d = build_decl (TYPE_DECL, name, t);
2894 TYPE_NAME (TREE_TYPE (d)) = d;
2895 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
2896 DECL_CONTEXT (d) = FROB_CONTEXT (context);
2897 DECL_ARTIFICIAL (d) = 1;
2899 /* Store it in the hash table. */
2902 /* TYPENAME_TYPEs must always be compared structurally, because
2903 they may or may not resolve down to another type depending on
2904 the currently open classes. */
2905 SET_TYPE_STRUCTURAL_EQUALITY (t);
2911 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
2912 provided to name the type. Returns an appropriate type, unless an
2913 error occurs, in which case error_mark_node is returned. If we
2914 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
2915 return that, rather than the _TYPE it corresponds to, in other
2916 cases we look through the type decl. If TF_ERROR is set, complain
2917 about errors, otherwise be quiet. */
2920 make_typename_type (tree context, tree name, enum tag_types tag_type,
2921 tsubst_flags_t complain)
2927 if (name == error_mark_node
2928 || context == NULL_TREE
2929 || context == error_mark_node)
2930 return error_mark_node;
2934 if (!(TYPE_LANG_SPECIFIC (name)
2935 && (CLASSTYPE_IS_TEMPLATE (name)
2936 || CLASSTYPE_USE_TEMPLATE (name))))
2937 name = TYPE_IDENTIFIER (name);
2939 /* Create a TEMPLATE_ID_EXPR for the type. */
2940 name = build_nt (TEMPLATE_ID_EXPR,
2941 CLASSTYPE_TI_TEMPLATE (name),
2942 CLASSTYPE_TI_ARGS (name));
2944 else if (TREE_CODE (name) == TYPE_DECL)
2945 name = DECL_NAME (name);
2949 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
2951 name = TREE_OPERAND (name, 0);
2952 if (TREE_CODE (name) == TEMPLATE_DECL)
2953 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
2954 else if (TREE_CODE (name) == OVERLOAD)
2956 error ("%qD is not a type", name);
2957 return error_mark_node;
2960 if (TREE_CODE (name) == TEMPLATE_DECL)
2962 error ("%qD used without template parameters", name);
2963 return error_mark_node;
2965 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
2966 gcc_assert (TYPE_P (context));
2968 /* When the CONTEXT is a dependent type, NAME could refer to a
2969 dependent base class of CONTEXT. So we cannot peek inside it,
2970 even if CONTEXT is a currently open scope. */
2971 if (dependent_type_p (context))
2972 return build_typename_type (context, name, fullname, tag_type);
2974 if (!MAYBE_CLASS_TYPE_P (context))
2976 if (complain & tf_error)
2977 error ("%q#T is not a class", context);
2978 return error_mark_node;
2981 want_template = TREE_CODE (fullname) == TEMPLATE_ID_EXPR;
2983 /* We should only set WANT_TYPE when we're a nested typename type.
2984 Then we can give better diagnostics if we find a non-type. */
2985 t = lookup_field (context, name, 0, /*want_type=*/true);
2988 if (complain & tf_error)
2989 error (want_template ? "no class template named %q#T in %q#T"
2990 : "no type named %q#T in %q#T", name, context);
2991 return error_mark_node;
2994 if (want_template && !DECL_CLASS_TEMPLATE_P (t))
2996 if (complain & tf_error)
2997 error ("%<typename %T::%D%> names %q#T, which is not a class template",
2999 return error_mark_node;
3001 if (!want_template && TREE_CODE (t) != TYPE_DECL)
3003 if (complain & tf_error)
3004 error ("%<typename %T::%D%> names %q#T, which is not a type",
3006 return error_mark_node;
3009 if (complain & tf_error)
3010 perform_or_defer_access_check (TYPE_BINFO (context), t, t);
3013 return lookup_template_class (t, TREE_OPERAND (fullname, 1),
3015 /*entering_scope=*/0,
3016 tf_warning_or_error | tf_user);
3018 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
3024 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3025 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3026 in which case error_mark_node is returned.
3028 If PARM_LIST is non-NULL, also make sure that the template parameter
3029 list of TEMPLATE_DECL matches.
3031 If COMPLAIN zero, don't complain about any errors that occur. */
3034 make_unbound_class_template (tree context, tree name, tree parm_list,
3035 tsubst_flags_t complain)
3041 name = TYPE_IDENTIFIER (name);
3042 else if (DECL_P (name))
3043 name = DECL_NAME (name);
3044 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3046 if (!dependent_type_p (context)
3047 || currently_open_class (context))
3049 tree tmpl = NULL_TREE;
3051 if (MAYBE_CLASS_TYPE_P (context))
3052 tmpl = lookup_field (context, name, 0, false);
3054 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
3056 if (complain & tf_error)
3057 error ("no class template named %q#T in %q#T", name, context);
3058 return error_mark_node;
3062 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
3064 if (complain & tf_error)
3066 error ("template parameters do not match template");
3067 error ("%q+D declared here", tmpl);
3069 return error_mark_node;
3072 if (complain & tf_error)
3073 perform_or_defer_access_check (TYPE_BINFO (context), tmpl, tmpl);
3078 /* Build the UNBOUND_CLASS_TEMPLATE. */
3079 t = cxx_make_type (UNBOUND_CLASS_TEMPLATE);
3080 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
3081 TREE_TYPE (t) = NULL_TREE;
3082 SET_TYPE_STRUCTURAL_EQUALITY (t);
3084 /* Build the corresponding TEMPLATE_DECL. */
3085 d = build_decl (TEMPLATE_DECL, name, t);
3086 TYPE_NAME (TREE_TYPE (d)) = d;
3087 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3088 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3089 DECL_ARTIFICIAL (d) = 1;
3090 DECL_TEMPLATE_PARMS (d) = parm_list;
3097 /* Push the declarations of builtin types into the namespace.
3098 RID_INDEX is the index of the builtin type in the array
3099 RID_POINTERS. NAME is the name used when looking up the builtin
3100 type. TYPE is the _TYPE node for the builtin type. */
3103 record_builtin_type (enum rid rid_index,
3107 tree rname = NULL_TREE, tname = NULL_TREE;
3108 tree tdecl = NULL_TREE;
3110 if ((int) rid_index < (int) RID_MAX)
3111 rname = ridpointers[(int) rid_index];
3113 tname = get_identifier (name);
3115 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
3116 eliminated. Built-in types should not be looked up name; their
3117 names are keywords that the parser can recognize. However, there
3118 is code in c-common.c that uses identifier_global_value to look
3119 up built-in types by name. */
3122 tdecl = build_decl (TYPE_DECL, tname, type);
3123 DECL_ARTIFICIAL (tdecl) = 1;
3124 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
3130 tdecl = build_decl (TYPE_DECL, rname, type);
3131 DECL_ARTIFICIAL (tdecl) = 1;
3133 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
3136 if (!TYPE_NAME (type))
3137 TYPE_NAME (type) = tdecl;
3140 debug_hooks->type_decl (tdecl, 0);
3143 /* Record one of the standard Java types.
3144 * Declare it as having the given NAME.
3145 * If SIZE > 0, it is the size of one of the integral types;
3146 * otherwise it is the negative of the size of one of the other types. */
3149 record_builtin_java_type (const char* name, int size)
3153 type = make_signed_type (size);
3154 else if (size > -32)
3155 { /* "__java_char" or ""__java_boolean". */
3156 type = make_unsigned_type (-size);
3157 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
3160 { /* "__java_float" or ""__java_double". */
3161 type = make_node (REAL_TYPE);
3162 TYPE_PRECISION (type) = - size;
3165 record_builtin_type (RID_MAX, name, type);
3166 decl = TYPE_NAME (type);
3168 /* Suppress generate debug symbol entries for these types,
3169 since for normal C++ they are just clutter.
3170 However, push_lang_context undoes this if extern "Java" is seen. */
3171 DECL_IGNORED_P (decl) = 1;
3173 TYPE_FOR_JAVA (type) = 1;
3177 /* Push a type into the namespace so that the back ends ignore it. */
3180 record_unknown_type (tree type, const char* name)
3182 tree decl = pushdecl (build_decl (TYPE_DECL, get_identifier (name), type));
3183 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3184 DECL_IGNORED_P (decl) = 1;
3185 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
3186 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
3187 TYPE_ALIGN (type) = 1;
3188 TYPE_USER_ALIGN (type) = 0;
3189 TYPE_MODE (type) = TYPE_MODE (void_type_node);
3192 /* A string for which we should create an IDENTIFIER_NODE at
3195 typedef struct predefined_identifier
3197 /* The name of the identifier. */
3198 const char *const name;
3199 /* The place where the IDENTIFIER_NODE should be stored. */
3201 /* Nonzero if this is the name of a constructor or destructor. */
3202 const int ctor_or_dtor_p;
3203 } predefined_identifier;
3205 /* Create all the predefined identifiers. */
3208 initialize_predefined_identifiers (void)
3210 const predefined_identifier *pid;
3212 /* A table of identifiers to create at startup. */
3213 static const predefined_identifier predefined_identifiers[] = {
3214 { "C++", &lang_name_cplusplus, 0 },
3215 { "C", &lang_name_c, 0 },
3216 { "Java", &lang_name_java, 0 },
3217 /* Some of these names have a trailing space so that it is
3218 impossible for them to conflict with names written by users. */
3219 { "__ct ", &ctor_identifier, 1 },
3220 { "__base_ctor ", &base_ctor_identifier, 1 },
3221 { "__comp_ctor ", &complete_ctor_identifier, 1 },
3222 { "__dt ", &dtor_identifier, 1 },
3223 { "__comp_dtor ", &complete_dtor_identifier, 1 },
3224 { "__base_dtor ", &base_dtor_identifier, 1 },
3225 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
3226 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
3227 { "nelts", &nelts_identifier, 0 },
3228 { THIS_NAME, &this_identifier, 0 },
3229 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
3230 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
3231 { "_vptr", &vptr_identifier, 0 },
3232 { "__vtt_parm", &vtt_parm_identifier, 0 },
3233 { "::", &global_scope_name, 0 },
3234 { "std", &std_identifier, 0 },
3238 for (pid = predefined_identifiers; pid->name; ++pid)
3240 *pid->node = get_identifier (pid->name);
3241 if (pid->ctor_or_dtor_p)
3242 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
3246 /* Create the predefined scalar types of C,
3247 and some nodes representing standard constants (0, 1, (void *)0).
3248 Initialize the global binding level.
3249 Make definitions for built-in primitive functions. */
3252 cxx_init_decl_processing (void)
3255 tree void_ftype_ptr;
3257 build_common_tree_nodes (flag_signed_char, false);
3259 /* Create all the identifiers we need. */
3260 initialize_predefined_identifiers ();
3262 /* Create the global variables. */
3263 push_to_top_level ();
3265 current_function_decl = NULL_TREE;
3266 current_binding_level = NULL;
3267 /* Enter the global namespace. */
3268 gcc_assert (global_namespace == NULL_TREE);
3269 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
3271 TREE_PUBLIC (global_namespace) = 1;
3272 begin_scope (sk_namespace, global_namespace);
3274 current_lang_name = NULL_TREE;
3276 if (flag_visibility_ms_compat)
3277 default_visibility = VISIBILITY_HIDDEN;
3280 current_lang_name = lang_name_c;
3282 /* Create the `std' namespace. */
3283 push_namespace (std_identifier);
3284 std_node = current_namespace;
3287 c_common_nodes_and_builtins ();
3289 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
3290 java_short_type_node = record_builtin_java_type ("__java_short", 16);
3291 java_int_type_node = record_builtin_java_type ("__java_int", 32);
3292 java_long_type_node = record_builtin_java_type ("__java_long", 64);
3293 java_float_type_node = record_builtin_java_type ("__java_float", -32);
3294 java_double_type_node = record_builtin_java_type ("__java_double", -64);
3295 java_char_type_node = record_builtin_java_type ("__java_char", -16);
3296 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
3298 integer_two_node = build_int_cst (NULL_TREE, 2);
3299 integer_three_node = build_int_cst (NULL_TREE, 3);
3301 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
3302 truthvalue_type_node = boolean_type_node;
3303 truthvalue_false_node = boolean_false_node;
3304 truthvalue_true_node = boolean_true_node;
3306 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
3309 record_builtin_type (RID_MAX, NULL, string_type_node);
3312 delta_type_node = ptrdiff_type_node;
3313 vtable_index_type = ptrdiff_type_node;
3315 vtt_parm_type = build_pointer_type (const_ptr_type_node);
3316 void_ftype = build_function_type (void_type_node, void_list_node);
3317 void_ftype_ptr = build_function_type (void_type_node,
3318 tree_cons (NULL_TREE,
3322 = build_exception_variant (void_ftype_ptr, empty_except_spec);
3324 /* C++ extensions */
3326 unknown_type_node = make_node (UNKNOWN_TYPE);
3327 record_unknown_type (unknown_type_node, "unknown type");
3329 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3330 TREE_TYPE (unknown_type_node) = unknown_type_node;
3332 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3334 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
3335 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
3337 init_list_type_node = make_node (UNKNOWN_TYPE);
3338 record_unknown_type (init_list_type_node, "init list");
3341 /* Make sure we get a unique function type, so we can give
3342 its pointer type a name. (This wins for gdb.) */
3343 tree vfunc_type = make_node (FUNCTION_TYPE);
3344 TREE_TYPE (vfunc_type) = integer_type_node;
3345 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
3346 layout_type (vfunc_type);
3348 vtable_entry_type = build_pointer_type (vfunc_type);
3350 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
3353 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
3354 layout_type (vtbl_type_node);
3355 vtbl_type_node = build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
3356 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
3357 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
3358 layout_type (vtbl_ptr_type_node);
3359 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
3361 push_namespace (get_identifier ("__cxxabiv1"));
3362 abi_node = current_namespace;
3365 global_type_node = make_node (LANG_TYPE);
3366 record_unknown_type (global_type_node, "global type");
3369 current_lang_name = lang_name_cplusplus;
3373 tree bad_alloc_type_node;
3374 tree bad_alloc_decl;
3375 tree newtype, deltype;
3376 tree ptr_ftype_sizetype;
3378 push_namespace (std_identifier);
3379 bad_alloc_id = get_identifier ("bad_alloc");
3380 bad_alloc_type_node = make_class_type (RECORD_TYPE);
3381 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3383 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3384 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3385 TYPE_STUB_DECL (bad_alloc_type_node) = bad_alloc_decl;
3389 = build_function_type (ptr_type_node,
3390 tree_cons (NULL_TREE,
3393 newtype = build_exception_variant
3394 (ptr_ftype_sizetype, add_exception_specifier
3395 (NULL_TREE, bad_alloc_type_node, -1));
3396 deltype = build_exception_variant (void_ftype_ptr, empty_except_spec);
3397 push_cp_library_fn (NEW_EXPR, newtype);
3398 push_cp_library_fn (VEC_NEW_EXPR, newtype);
3399 global_delete_fndecl = push_cp_library_fn (DELETE_EXPR, deltype);
3400 push_cp_library_fn (VEC_DELETE_EXPR, deltype);
3404 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype);
3406 /* Perform other language dependent initializations. */
3407 init_class_processing ();
3408 init_rtti_processing ();
3410 if (flag_exceptions)
3411 init_exception_processing ();
3413 if (! supports_one_only ())
3416 make_fname_decl = cp_make_fname_decl;
3417 start_fname_decls ();
3419 /* Show we use EH for cleanups. */
3420 if (flag_exceptions)
3421 using_eh_for_cleanups ();
3424 /* Generate an initializer for a function naming variable from
3425 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
3426 filled in with the type of the init. */
3429 cp_fname_init (const char* name, tree *type_p)
3431 tree domain = NULL_TREE;
3433 tree init = NULL_TREE;
3438 length = strlen (name);
3439 domain = build_index_type (size_int (length));
3440 init = build_string (length + 1, name);
3443 type = build_qualified_type (char_type_node, TYPE_QUAL_CONST);
3444 type = build_cplus_array_type (type, domain);
3449 TREE_TYPE (init) = type;
3451 init = error_mark_node;
3456 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
3457 decl, NAME is the initialization string and TYPE_DEP indicates whether
3458 NAME depended on the type of the function. We make use of that to detect
3459 __PRETTY_FUNCTION__ inside a template fn. This is being done
3460 lazily at the point of first use, so we mustn't push the decl now. */
3463 cp_make_fname_decl (tree id, int type_dep)
3465 const char *const name = (type_dep && processing_template_decl
3466 ? NULL : fname_as_string (type_dep));
3468 tree init = cp_fname_init (name, &type);
3469 tree decl = build_decl (VAR_DECL, id, type);
3472 free (CONST_CAST (char *, name));
3474 /* As we're using pushdecl_with_scope, we must set the context. */
3475 DECL_CONTEXT (decl) = current_function_decl;
3476 DECL_PRETTY_FUNCTION_P (decl) = type_dep;
3478 TREE_STATIC (decl) = 1;
3479 TREE_READONLY (decl) = 1;
3480 DECL_ARTIFICIAL (decl) = 1;
3482 TREE_USED (decl) = 1;
3484 if (current_function_decl)
3486 struct cp_binding_level *b = current_binding_level;
3487 while (b->level_chain->kind != sk_function_parms)
3489 pushdecl_with_scope (decl, b, /*is_friend=*/false);
3490 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, NULL_TREE,
3491 LOOKUP_ONLYCONVERTING);
3494 pushdecl_top_level_and_finish (decl, init);
3500 builtin_function_1 (tree decl, tree context)
3502 tree id = DECL_NAME (decl);
3503 const char *name = IDENTIFIER_POINTER (id);
3505 retrofit_lang_decl (decl);
3507 /* All nesting of C++ functions is lexical; there is never a "static
3508 chain" in the sense of GNU C nested functions. */
3509 DECL_NO_STATIC_CHAIN (decl) = 1;
3511 DECL_ARTIFICIAL (decl) = 1;
3512 SET_OVERLOADED_OPERATOR_CODE (decl, ERROR_MARK);
3513 SET_DECL_LANGUAGE (decl, lang_c);
3514 /* Runtime library routines are, by definition, available in an
3515 external shared object. */
3516 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
3517 DECL_VISIBILITY_SPECIFIED (decl) = 1;
3519 DECL_CONTEXT (decl) = context;
3523 /* A function in the user's namespace should have an explicit
3524 declaration before it is used. Mark the built-in function as
3525 anticipated but not actually declared. */
3526 if (name[0] != '_' || name[1] != '_')
3527 DECL_ANTICIPATED (decl) = 1;
3528 else if (strncmp (name + 2, "builtin_", strlen ("builtin_")) != 0)
3530 size_t len = strlen (name);
3532 /* Treat __*_chk fortification functions as anticipated as well,
3533 unless they are __builtin_*. */
3534 if (len > strlen ("___chk")
3535 && memcmp (name + len - strlen ("_chk"),
3536 "_chk", strlen ("_chk") + 1) == 0)
3537 DECL_ANTICIPATED (decl) = 1;
3544 cxx_builtin_function (tree decl)
3546 tree id = DECL_NAME (decl);
3547 const char *name = IDENTIFIER_POINTER (id);
3548 /* All builtins that don't begin with an '_' should additionally
3549 go in the 'std' namespace. */
3552 tree decl2 = copy_node(decl);
3553 push_namespace (std_identifier);
3554 builtin_function_1 (decl2, std_node);
3558 return builtin_function_1 (decl, NULL_TREE);
3561 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
3562 function. Not called directly. */
3565 build_library_fn_1 (tree name, enum tree_code operator_code, tree type)
3567 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
3568 DECL_EXTERNAL (fn) = 1;
3569 TREE_PUBLIC (fn) = 1;
3570 DECL_ARTIFICIAL (fn) = 1;
3571 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
3572 SET_DECL_LANGUAGE (fn, lang_c);
3573 /* Runtime library routines are, by definition, available in an
3574 external shared object. */
3575 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
3576 DECL_VISIBILITY_SPECIFIED (fn) = 1;
3580 /* Returns the _DECL for a library function with C linkage.
3581 We assume that such functions never throw; if this is incorrect,
3582 callers should unset TREE_NOTHROW. */
3585 build_library_fn (tree name, tree type)
3587 tree fn = build_library_fn_1 (name, ERROR_MARK, type);
3588 TREE_NOTHROW (fn) = 1;
3592 /* Returns the _DECL for a library function with C++ linkage. */
3595 build_cp_library_fn (tree name, enum tree_code operator_code, tree type)
3597 tree fn = build_library_fn_1 (name, operator_code, type);
3598 TREE_NOTHROW (fn) = TYPE_NOTHROW_P (type);
3599 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
3600 SET_DECL_LANGUAGE (fn, lang_cplusplus);
3604 /* Like build_library_fn, but takes a C string instead of an
3608 build_library_fn_ptr (const char* name, tree type)
3610 return build_library_fn (get_identifier (name), type);
3613 /* Like build_cp_library_fn, but takes a C string instead of an
3617 build_cp_library_fn_ptr (const char* name, tree type)
3619 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type);
3622 /* Like build_library_fn, but also pushes the function so that we will
3623 be able to find it via IDENTIFIER_GLOBAL_VALUE. Also, the function
3624 may throw exceptions listed in RAISES. */
3627 push_library_fn (tree name, tree type, tree raises)
3632 type = build_exception_variant (type, raises);
3634 fn = build_library_fn (name, type);
3635 pushdecl_top_level (fn);
3639 /* Like build_cp_library_fn, but also pushes the function so that it
3640 will be found by normal lookup. */
3643 push_cp_library_fn (enum tree_code operator_code, tree type)
3645 tree fn = build_cp_library_fn (ansi_opname (operator_code),
3652 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
3656 push_void_library_fn (tree name, tree parmtypes)
3658 tree type = build_function_type (void_type_node, parmtypes);
3659 return push_library_fn (name, type, NULL_TREE);
3662 /* Like push_library_fn, but also note that this function throws
3663 and does not return. Used for __throw_foo and the like. */
3666 push_throw_library_fn (tree name, tree type)
3668 tree fn = push_library_fn (name, type, NULL_TREE);
3669 TREE_THIS_VOLATILE (fn) = 1;
3670 TREE_NOTHROW (fn) = 0;
3674 /* When we call finish_struct for an anonymous union, we create
3675 default copy constructors and such. But, an anonymous union
3676 shouldn't have such things; this function undoes the damage to the
3677 anonymous union type T.
3679 (The reason that we create the synthesized methods is that we don't
3680 distinguish `union { int i; }' from `typedef union { int i; } U'.
3681 The first is an anonymous union; the second is just an ordinary
3685 fixup_anonymous_aggr (tree t)
3689 /* Wipe out memory of synthesized methods. */
3690 TYPE_HAS_USER_CONSTRUCTOR (t) = 0;
3691 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
3692 TYPE_HAS_INIT_REF (t) = 0;
3693 TYPE_HAS_CONST_INIT_REF (t) = 0;
3694 TYPE_HAS_ASSIGN_REF (t) = 0;
3695 TYPE_HAS_CONST_ASSIGN_REF (t) = 0;
3697 /* Splice the implicitly generated functions out of the TYPE_METHODS
3699 q = &TYPE_METHODS (t);
3702 if (DECL_ARTIFICIAL (*q))
3703 *q = TREE_CHAIN (*q);
3705 q = &TREE_CHAIN (*q);
3708 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
3709 if (TYPE_METHODS (t))
3711 tree decl = TYPE_MAIN_DECL (t);
3713 if (TREE_CODE (t) != UNION_TYPE)
3714 error ("%Jan anonymous struct cannot have function members", decl);
3716 error ("%Jan anonymous union cannot have function members", decl);
3719 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
3720 assignment operators (because they cannot have these methods themselves).
3721 For anonymous unions this is already checked because they are not allowed
3722 in any union, otherwise we have to check it. */
3723 if (TREE_CODE (t) != UNION_TYPE)
3727 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
3728 if (TREE_CODE (field) == FIELD_DECL)
3730 type = TREE_TYPE (field);
3731 if (CLASS_TYPE_P (type))
3733 if (TYPE_NEEDS_CONSTRUCTING (type))
3734 error ("member %q+#D with constructor not allowed "
3735 "in anonymous aggregate", field);
3736 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
3737 error ("member %q+#D with destructor not allowed "
3738 "in anonymous aggregate", field);
3739 if (TYPE_HAS_COMPLEX_ASSIGN_REF (type))
3740 error ("member %q+#D with copy assignment operator "
3741 "not allowed in anonymous aggregate", field);
3747 /* Make sure that a declaration with no declarator is well-formed, i.e.
3748 just declares a tagged type or anonymous union.
3750 Returns the type declared; or NULL_TREE if none. */
3753 check_tag_decl (cp_decl_specifier_seq *declspecs)
3755 int saw_friend = declspecs->specs[(int)ds_friend] != 0;
3756 int saw_typedef = declspecs->specs[(int)ds_typedef] != 0;
3757 /* If a class, struct, or enum type is declared by the DECLSPECS
3758 (i.e, if a class-specifier, enum-specifier, or non-typename
3759 elaborated-type-specifier appears in the DECLSPECS),
3760 DECLARED_TYPE is set to the corresponding type. */
3761 tree declared_type = NULL_TREE;
3762 bool error_p = false;
3764 if (declspecs->multiple_types_p)
3765 error ("multiple types in one declaration");
3766 else if (declspecs->redefined_builtin_type)
3768 if (!in_system_header)
3769 permerror (input_location, "redeclaration of C++ built-in type %qT",
3770 declspecs->redefined_builtin_type);
3775 && TYPE_P (declspecs->type)
3776 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
3777 && MAYBE_CLASS_TYPE_P (declspecs->type))
3778 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
3779 declared_type = declspecs->type;
3780 else if (declspecs->type == error_mark_node)
3782 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
3783 permerror (input_location, "declaration does not declare anything");
3784 /* Check for an anonymous union. */
3785 else if (declared_type && RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type))
3786 && TYPE_ANONYMOUS_P (declared_type))
3788 /* 7/3 In a simple-declaration, the optional init-declarator-list
3789 can be omitted only when declaring a class (clause 9) or
3790 enumeration (7.2), that is, when the decl-specifier-seq contains
3791 either a class-specifier, an elaborated-type-specifier with
3792 a class-key (9.1), or an enum-specifier. In these cases and
3793 whenever a class-specifier or enum-specifier is present in the
3794 decl-specifier-seq, the identifiers in these specifiers are among
3795 the names being declared by the declaration (as class-name,
3796 enum-names, or enumerators, depending on the syntax). In such
3797 cases, and except for the declaration of an unnamed bit-field (9.6),
3798 the decl-specifier-seq shall introduce one or more names into the
3799 program, or shall redeclare a name introduced by a previous
3800 declaration. [Example:
3801 enum { }; // ill-formed
3802 typedef class { }; // ill-formed
3806 error ("missing type-name in typedef-declaration");
3809 /* Anonymous unions are objects, so they can have specifiers. */;
3810 SET_ANON_AGGR_TYPE_P (declared_type);
3812 if (TREE_CODE (declared_type) != UNION_TYPE && !in_system_header)
3813 pedwarn (input_location, OPT_pedantic, "ISO C++ prohibits anonymous structs");
3818 if (declspecs->specs[(int)ds_inline]
3819 || declspecs->specs[(int)ds_virtual])
3820 error ("%qs can only be specified for functions",
3821 declspecs->specs[(int)ds_inline]
3822 ? "inline" : "virtual");
3824 && (!current_class_type
3825 || current_scope () != current_class_type))
3826 error ("%<friend%> can only be specified inside a class");
3827 else if (declspecs->specs[(int)ds_explicit])
3828 error ("%<explicit%> can only be specified for constructors");
3829 else if (declspecs->storage_class)
3830 error ("a storage class can only be specified for objects "
3832 else if (declspecs->specs[(int)ds_const]
3833 || declspecs->specs[(int)ds_volatile]
3834 || declspecs->specs[(int)ds_restrict]
3835 || declspecs->specs[(int)ds_thread])
3836 error ("qualifiers can only be specified for objects "
3838 else if (saw_typedef)
3839 warning (0, "%<typedef%> was ignored in this declaration");
3842 return declared_type;
3845 /* Called when a declaration is seen that contains no names to declare.
3846 If its type is a reference to a structure, union or enum inherited
3847 from a containing scope, shadow that tag name for the current scope
3848 with a forward reference.
3849 If its type defines a new named structure or union
3850 or defines an enum, it is valid but we need not do anything here.
3851 Otherwise, it is an error.
3853 C++: may have to grok the declspecs to learn about static,
3854 complain for anonymous unions.
3856 Returns the TYPE declared -- or NULL_TREE if none. */
3859 shadow_tag (cp_decl_specifier_seq *declspecs)
3861 tree t = check_tag_decl (declspecs);
3866 if (declspecs->attributes)
3868 warning (0, "attribute ignored in declaration of %q+#T", t);
3869 warning (0, "attribute for %q+#T must follow the %qs keyword",
3870 t, class_key_or_enum_as_string (t));
3874 if (maybe_process_partial_specialization (t) == error_mark_node)
3877 /* This is where the variables in an anonymous union are
3878 declared. An anonymous union declaration looks like:
3880 because there is no declarator after the union, the parser
3881 sends that declaration here. */
3882 if (ANON_AGGR_TYPE_P (t))
3884 fixup_anonymous_aggr (t);
3886 if (TYPE_FIELDS (t))
3888 tree decl = grokdeclarator (/*declarator=*/NULL,
3889 declspecs, NORMAL, 0, NULL);
3890 finish_anon_union (decl);
3897 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3900 groktypename (cp_decl_specifier_seq *type_specifiers,
3901 const cp_declarator *declarator)
3905 attrs = type_specifiers->attributes;
3906 type_specifiers->attributes = NULL_TREE;
3907 type = grokdeclarator (declarator, type_specifiers, TYPENAME, 0, &attrs);
3908 if (attrs && type != error_mark_node)
3910 if (CLASS_TYPE_P (type))
3911 warning (OPT_Wattributes, "ignoring attributes applied to class type %qT "
3912 "outside of definition", type);
3913 else if (MAYBE_CLASS_TYPE_P (type))
3914 /* A template type parameter or other dependent type. */
3915 warning (OPT_Wattributes, "ignoring attributes applied to dependent "
3916 "type %qT without an associated declaration", type);
3918 cplus_decl_attributes (&type, attrs, 0);
3923 /* Process a DECLARATOR for a function-scope variable declaration,
3924 namespace-scope variable declaration, or function declaration.
3925 (Function definitions go through start_function; class member
3926 declarations appearing in the body of the class go through
3927 grokfield.) The DECL corresponding to the DECLARATOR is returned.
3928 If an error occurs, the error_mark_node is returned instead.
3930 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is 1
3931 if an explicit initializer is present, or 2 for an explicitly defaulted
3932 function, or 3 for an explicitly deleted function, but 0 if this is a
3933 variable implicitly initialized via a default constructor. ATTRIBUTES
3934 and PREFIX_ATTRIBUTES are GNU attributes associated with this
3935 declaration. *PUSHED_SCOPE_P is set to the scope entered in this
3936 function, if any; if set, the caller is responsible for calling
3940 start_decl (const cp_declarator *declarator,
3941 cp_decl_specifier_seq *declspecs,
3944 tree prefix_attributes,
3945 tree *pushed_scope_p)
3953 *pushed_scope_p = NULL_TREE;
3955 /* An object declared as __attribute__((deprecated)) suppresses
3956 warnings of uses of other deprecated items. */
3957 if (lookup_attribute ("deprecated", attributes))
3958 deprecated_state = DEPRECATED_SUPPRESS;
3960 attributes = chainon (attributes, prefix_attributes);
3962 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
3965 deprecated_state = DEPRECATED_NORMAL;
3967 if (decl == NULL_TREE || TREE_CODE (decl) == VOID_TYPE
3968 || decl == error_mark_node)
3969 return error_mark_node;
3971 type = TREE_TYPE (decl);
3973 context = DECL_CONTEXT (decl);
3977 *pushed_scope_p = push_scope (context);
3979 /* We are only interested in class contexts, later. */
3980 if (TREE_CODE (context) == NAMESPACE_DECL)
3981 context = NULL_TREE;
3985 /* Is it valid for this decl to have an initializer at all?
3986 If not, set INITIALIZED to zero, which will indirectly
3987 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
3988 switch (TREE_CODE (decl))
3991 error ("typedef %qD is initialized (use decltype instead)", decl);
3992 return error_mark_node;
3995 if (initialized == 3)
3996 /* We'll handle the rest of the semantics later, but we need to
3997 set this now so it's visible to duplicate_decls. */
3998 DECL_DELETED_FN (decl) = 1;
4007 if (! toplevel_bindings_p ()
4008 && DECL_EXTERNAL (decl))
4009 warning (0, "declaration of %q#D has %<extern%> and is initialized",
4011 DECL_EXTERNAL (decl) = 0;
4012 if (toplevel_bindings_p ())
4013 TREE_STATIC (decl) = 1;
4016 /* If this is a typedef that names the class for linkage purposes
4017 (7.1.3p8), apply any attributes directly to the type. */
4018 if (TREE_CODE (decl) == TYPE_DECL
4019 && TAGGED_TYPE_P (TREE_TYPE (decl))
4020 && decl == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl))))
4021 flags = ATTR_FLAG_TYPE_IN_PLACE;
4025 /* Set attributes here so if duplicate decl, will have proper attributes. */
4026 cplus_decl_attributes (&decl, attributes, flags);
4028 /* Dllimported symbols cannot be defined. Static data members (which
4029 can be initialized in-class and dllimported) go through grokfield,
4030 not here, so we don't need to exclude those decls when checking for
4032 if (initialized && DECL_DLLIMPORT_P (decl))
4034 error ("definition of %q#D is marked %<dllimport%>", decl);
4035 DECL_DLLIMPORT_P (decl) = 0;
4038 /* If #pragma weak was used, mark the decl weak now. */
4039 maybe_apply_pragma_weak (decl);
4041 if (TREE_CODE (decl) == FUNCTION_DECL
4042 && DECL_DECLARED_INLINE_P (decl)
4043 && DECL_UNINLINABLE (decl)
4044 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4045 warning (0, "inline function %q+D given attribute noinline", decl);
4047 if (context && COMPLETE_TYPE_P (complete_type (context)))
4049 if (TREE_CODE (decl) == VAR_DECL)
4051 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
4052 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
4053 error ("%q#D is not a static member of %q#T", decl, context);
4056 if (DECL_CONTEXT (field) != context)
4058 if (!same_type_p (DECL_CONTEXT (field), context))
4059 permerror (input_location, "ISO C++ does not permit %<%T::%D%> "
4060 "to be defined as %<%T::%D%>",
4061 DECL_CONTEXT (field), DECL_NAME (decl),
4062 context, DECL_NAME (decl));
4063 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
4065 if (processing_specialization
4066 && template_class_depth (context) == 0
4067 && CLASSTYPE_TEMPLATE_SPECIALIZATION (context))
4068 error ("template header not allowed in member definition "
4069 "of explicitly specialized class");
4070 /* Static data member are tricky; an in-class initialization
4071 still doesn't provide a definition, so the in-class
4072 declaration will have DECL_EXTERNAL set, but will have an
4073 initialization. Thus, duplicate_decls won't warn
4074 about this situation, and so we check here. */
4075 if (initialized && DECL_INITIALIZED_IN_CLASS_P (field))
4076 error ("duplicate initialization of %qD", decl);
4077 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
4083 tree field = check_classfn (context, decl,
4084 (processing_template_decl
4085 > template_class_depth (context))
4086 ? current_template_parms
4088 if (field && field != error_mark_node
4089 && duplicate_decls (decl, field,
4090 /*newdecl_is_friend=*/false))
4094 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
4095 DECL_IN_AGGR_P (decl) = 0;
4096 /* Do not mark DECL as an explicit specialization if it was not
4097 already marked as an instantiation; a declaration should
4098 never be marked as a specialization unless we know what
4099 template is being specialized. */
4100 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
4102 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
4104 /* [temp.expl.spec] An explicit specialization of a static data
4105 member of a template is a definition if the declaration
4106 includes an initializer; otherwise, it is a declaration.
4108 We check for processing_specialization so this only applies
4109 to the new specialization syntax. */
4110 if (!initialized && processing_specialization)
4111 DECL_EXTERNAL (decl) = 1;
4114 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl))
4115 permerror (input_location, "declaration of %q#D outside of class is not definition",
4119 was_public = TREE_PUBLIC (decl);
4121 /* Enter this declaration into the symbol table. */
4122 decl = maybe_push_decl (decl);
4124 if (processing_template_decl)
4125 decl = push_template_decl (decl);
4126 if (decl == error_mark_node)
4127 return error_mark_node;
4129 /* Tell the back end to use or not use .common as appropriate. If we say
4130 -fconserve-space, we want this to save .data space, at the expense of
4131 wrong semantics. If we say -fno-conserve-space, we want this to
4132 produce errors about redefs; to do this we force variables into the
4134 if (flag_conserve_space
4135 && TREE_CODE (decl) == VAR_DECL
4136 && TREE_PUBLIC (decl)
4137 && !DECL_THREAD_LOCAL_P (decl)
4138 && !have_global_bss_p ())
4139 DECL_COMMON (decl) = 1;
4141 if (TREE_CODE (decl) == VAR_DECL
4142 && DECL_NAMESPACE_SCOPE_P (decl) && !TREE_PUBLIC (decl) && !was_public
4143 && !DECL_THIS_STATIC (decl) && !DECL_ARTIFICIAL (decl))
4145 /* This is a const variable with implicit 'static'. Set
4146 DECL_THIS_STATIC so we can tell it from variables that are
4147 !TREE_PUBLIC because of the anonymous namespace. */
4148 gcc_assert (cp_type_readonly (TREE_TYPE (decl)));
4149 DECL_THIS_STATIC (decl) = 1;
4152 if (!processing_template_decl && TREE_CODE (decl) == VAR_DECL)
4153 start_decl_1 (decl, initialized);
4158 /* Process the declaration of a variable DECL. INITIALIZED is true
4159 iff DECL is explicitly initialized. (INITIALIZED is false if the
4160 variable is initialized via an implicitly-called constructor.)
4161 This function must be called for ordinary variables (including, for
4162 example, implicit instantiations of templates), but must not be
4163 called for template declarations. */
4166 start_decl_1 (tree decl, bool initialized)
4170 bool aggregate_definition_p;
4172 gcc_assert (!processing_template_decl);
4174 if (error_operand_p (decl))
4177 gcc_assert (TREE_CODE (decl) == VAR_DECL);
4179 type = TREE_TYPE (decl);
4180 complete_p = COMPLETE_TYPE_P (type);
4181 aggregate_definition_p = MAYBE_CLASS_TYPE_P (type) && !DECL_EXTERNAL (decl);
4183 /* If an explicit initializer is present, or if this is a definition
4184 of an aggregate, then we need a complete type at this point.
4185 (Scalars are always complete types, so there is nothing to
4186 check.) This code just sets COMPLETE_P; errors (if necessary)
4187 are issued below. */
4188 if ((initialized || aggregate_definition_p)
4190 && COMPLETE_TYPE_P (complete_type (type)))
4193 /* We will not yet have set TREE_READONLY on DECL if the type
4194 was "const", but incomplete, before this point. But, now, we
4195 have a complete type, so we can try again. */
4196 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
4200 /* Is it valid for this decl to have an initializer at all? */
4202 /* Don't allow initializations for incomplete types except for
4203 arrays which might be completed by the initialization. */
4205 ; /* A complete type is ok. */
4206 else if (TREE_CODE (type) != ARRAY_TYPE)
4208 error ("variable %q#D has initializer but incomplete type", decl);
4209 type = TREE_TYPE (decl) = error_mark_node;
4211 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4213 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
4214 error ("elements of array %q#D have incomplete type", decl);
4215 /* else we already gave an error in start_decl. */
4218 else if (aggregate_definition_p && !complete_p)
4220 error ("aggregate %q#D has incomplete type and cannot be defined",
4222 /* Change the type so that assemble_variable will give
4223 DECL an rtl we can live with: (mem (const_int 0)). */
4224 type = TREE_TYPE (decl) = error_mark_node;
4227 /* Create a new scope to hold this declaration if necessary.
4228 Whether or not a new scope is necessary cannot be determined
4229 until after the type has been completed; if the type is a
4230 specialization of a class template it is not until after
4231 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
4232 will be set correctly. */
4233 maybe_push_cleanup_level (type);
4236 /* Handle initialization of references. DECL, TYPE, and INIT have the
4237 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
4238 but will be set to a new CLEANUP_STMT if a temporary is created
4239 that must be destroyed subsequently.
4241 Returns an initializer expression to use to initialize DECL, or
4242 NULL if the initialization can be performed statically.
4244 Quotes on semantics can be found in ARM 8.4.3. */
4247 grok_reference_init (tree decl, tree type, tree init, tree *cleanup)
4251 if (init == NULL_TREE)
4253 if ((DECL_LANG_SPECIFIC (decl) == 0
4254 || DECL_IN_AGGR_P (decl) == 0)
4255 && ! DECL_THIS_EXTERN (decl))
4256 error ("%qD declared as reference but not initialized", decl);
4260 if (TREE_CODE (init) == CONSTRUCTOR)
4262 error ("ISO C++ forbids use of initializer list to "
4263 "initialize reference %qD", decl);
4267 if (TREE_CODE (init) == TREE_LIST)
4268 init = build_x_compound_expr_from_list (init, "initializer");
4270 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
4271 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
4272 /* Note: default conversion is only called in very special cases. */
4273 init = decay_conversion (init);
4275 /* Convert INIT to the reference type TYPE. This may involve the
4276 creation of a temporary, whose lifetime must be the same as that
4277 of the reference. If so, a DECL_EXPR for the temporary will be
4278 added just after the DECL_EXPR for DECL. That's why we don't set
4279 DECL_INITIAL for local references (instead assigning to them
4280 explicitly); we need to allow the temporary to be initialized
4282 tmp = initialize_reference (type, init, decl, cleanup);
4284 if (tmp == error_mark_node)
4286 else if (tmp == NULL_TREE)
4288 error ("cannot initialize %qT from %qT", type, TREE_TYPE (init));
4292 if (TREE_STATIC (decl) && !TREE_CONSTANT (tmp))
4295 DECL_INITIAL (decl) = tmp;
4300 /* Subroutine of check_initializer. We're initializing a DECL of
4301 std::initializer_list<T> TYPE from a braced-init-list INIT, and need to
4302 extend the lifetime of the underlying array to match that of the decl,
4303 just like for reference initialization. CLEANUP is as for
4304 grok_reference_init. */
4307 build_init_list_var_init (tree decl, tree type, tree init, tree *cleanup)
4309 tree aggr_init, array, arrtype;
4310 init = perform_implicit_conversion (type, init, tf_warning_or_error);
4311 aggr_init = TARGET_EXPR_INITIAL (init);
4312 init = build2 (INIT_EXPR, type, decl, init);
4314 array = AGGR_INIT_EXPR_ARG (aggr_init, 1);
4315 arrtype = TREE_TYPE (array);
4317 gcc_assert (TREE_CODE (array) == ADDR_EXPR);
4318 array = TREE_OPERAND (array, 0);
4319 /* If the array is constant, finish_compound_literal already made it a
4320 static variable and we don't need to do anything here. */
4321 if (decl && TREE_CODE (array) == TARGET_EXPR)
4324 tree var = set_up_extended_ref_temp (decl, array, cleanup, &subinit);
4325 var = build_address (var);
4326 var = convert (arrtype, var);
4327 AGGR_INIT_EXPR_ARG (aggr_init, 1) = var;
4328 init = build2 (COMPOUND_EXPR, TREE_TYPE (init), subinit, init);
4333 /* Designated initializers in arrays are not supported in GNU C++.
4334 The parser cannot detect this error since it does not know whether
4335 a given brace-enclosed initializer is for a class type or for an
4336 array. This function checks that CE does not use a designated
4337 initializer. If it does, an error is issued. Returns true if CE
4338 is valid, i.e., does not have a designated initializer. */
4341 check_array_designated_initializer (const constructor_elt *ce)
4343 /* Designated initializers for array elements are not supported. */
4346 /* The parser only allows identifiers as designated
4348 gcc_assert (TREE_CODE (ce->index) == IDENTIFIER_NODE);
4349 error ("name %qD used in a GNU-style designated "
4350 "initializer for an array", ce->index);
4357 /* When parsing `int a[] = {1, 2};' we don't know the size of the
4358 array until we finish parsing the initializer. If that's the
4359 situation we're in, update DECL accordingly. */
4362 maybe_deduce_size_from_array_init (tree decl, tree init)
4364 tree type = TREE_TYPE (decl);
4366 if (TREE_CODE (type) == ARRAY_TYPE
4367 && TYPE_DOMAIN (type) == NULL_TREE
4368 && TREE_CODE (decl) != TYPE_DECL)
4370 /* do_default is really a C-ism to deal with tentative definitions.
4371 But let's leave it here to ease the eventual merge. */
4372 int do_default = !DECL_EXTERNAL (decl);
4373 tree initializer = init ? init : DECL_INITIAL (decl);
4376 /* Check that there are no designated initializers in INIT, as
4377 those are not supported in GNU C++, and as the middle-end
4378 will crash if presented with a non-numeric designated
4380 if (initializer && TREE_CODE (initializer) == CONSTRUCTOR)
4382 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initializer);
4383 constructor_elt *ce;
4386 VEC_iterate (constructor_elt, v, i, ce);
4388 if (!check_array_designated_initializer (ce))
4394 failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
4398 error ("initializer fails to determine size of %qD", decl);
4399 TREE_TYPE (decl) = error_mark_node;
4401 else if (failure == 2)
4405 error ("array size missing in %qD", decl);
4406 TREE_TYPE (decl) = error_mark_node;
4408 /* If a `static' var's size isn't known, make it extern as
4409 well as static, so it does not get allocated. If it's not
4410 `static', then don't mark it extern; finish_incomplete_decl
4411 will give it a default size and it will get allocated. */
4412 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4413 DECL_EXTERNAL (decl) = 1;
4415 else if (failure == 3)
4417 error ("zero-size array %qD", decl);
4418 TREE_TYPE (decl) = error_mark_node;
4422 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
4424 layout_decl (decl, 0);
4428 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
4429 any appropriate error messages regarding the layout. */
4432 layout_var_decl (tree decl)
4436 type = TREE_TYPE (decl);
4437 if (type == error_mark_node)
4440 /* If we haven't already layed out this declaration, do so now.
4441 Note that we must not call complete type for an external object
4442 because it's type might involve templates that we are not
4443 supposed to instantiate yet. (And it's perfectly valid to say
4444 `extern X x' for some incomplete type `X'.) */
4445 if (!DECL_EXTERNAL (decl))
4446 complete_type (type);
4447 if (!DECL_SIZE (decl)
4448 && TREE_TYPE (decl) != error_mark_node
4449 && (COMPLETE_TYPE_P (type)
4450 || (TREE_CODE (type) == ARRAY_TYPE
4451 && !TYPE_DOMAIN (type)
4452 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
4453 layout_decl (decl, 0);
4455 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
4457 /* An automatic variable with an incomplete type: that is an error.
4458 Don't talk about array types here, since we took care of that
4459 message in grokdeclarator. */
4460 error ("storage size of %qD isn't known", decl);
4461 TREE_TYPE (decl) = error_mark_node;
4464 /* Keep this code around in case we later want to control debug info
4465 based on whether a type is "used". (jason 1999-11-11) */
4467 else if (!DECL_EXTERNAL (decl) && MAYBE_CLASS_TYPE_P (ttype))
4468 /* Let debugger know it should output info for this type. */
4469 note_debug_info_needed (ttype);
4471 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4472 note_debug_info_needed (DECL_CONTEXT (decl));
4475 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4476 && DECL_SIZE (decl) != NULL_TREE
4477 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4479 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4480 constant_expression_warning (DECL_SIZE (decl));
4483 error ("storage size of %qD isn't constant", decl);
4484 TREE_TYPE (decl) = error_mark_node;
4489 /* If a local static variable is declared in an inline function, or if
4490 we have a weak definition, we must endeavor to create only one
4491 instance of the variable at link-time. */
4494 maybe_commonize_var (tree decl)
4496 /* Static data in a function with comdat linkage also has comdat
4498 if (TREE_STATIC (decl)
4499 /* Don't mess with __FUNCTION__. */
4500 && ! DECL_ARTIFICIAL (decl)
4501 && DECL_FUNCTION_SCOPE_P (decl)
4502 /* Unfortunately, import_export_decl has not always been called
4503 before the function is processed, so we cannot simply check
4505 && (DECL_COMDAT (DECL_CONTEXT (decl))
4506 || ((DECL_DECLARED_INLINE_P (DECL_CONTEXT (decl))
4507 || DECL_TEMPLATE_INSTANTIATION (DECL_CONTEXT (decl)))
4508 && TREE_PUBLIC (DECL_CONTEXT (decl)))))
4512 /* With weak symbols, we simply make the variable COMDAT;
4513 that will cause copies in multiple translations units to
4515 comdat_linkage (decl);
4519 if (DECL_INITIAL (decl) == NULL_TREE
4520 || DECL_INITIAL (decl) == error_mark_node)
4522 /* Without weak symbols, we can use COMMON to merge
4523 uninitialized variables. */
4524 TREE_PUBLIC (decl) = 1;
4525 DECL_COMMON (decl) = 1;
4529 /* While for initialized variables, we must use internal
4530 linkage -- which means that multiple copies will not
4532 TREE_PUBLIC (decl) = 0;
4533 DECL_COMMON (decl) = 0;
4534 warning (0, "sorry: semantics of inline function static "
4535 "data %q+#D are wrong (you'll wind up "
4536 "with multiple copies)", decl);
4537 warning (0, "%J you can work around this by removing "
4543 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4544 /* Set it up again; we might have set DECL_INITIAL since the last
4546 comdat_linkage (decl);
4549 /* Issue an error message if DECL is an uninitialized const variable. */
4552 check_for_uninitialized_const_var (tree decl)
4554 tree type = TREE_TYPE (decl);
4556 /* ``Unless explicitly declared extern, a const object does not have
4557 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4559 if (TREE_CODE (decl) == VAR_DECL
4560 && TREE_CODE (type) != REFERENCE_TYPE
4561 && CP_TYPE_CONST_P (type)
4562 && !TYPE_NEEDS_CONSTRUCTING (type)
4563 && !DECL_INITIAL (decl))
4564 error ("uninitialized const %qD", decl);
4568 /* Structure holding the current initializer being processed by reshape_init.
4569 CUR is a pointer to the current element being processed, END is a pointer
4570 after the last element present in the initializer. */
4571 typedef struct reshape_iterator_t
4573 constructor_elt *cur;
4574 constructor_elt *end;
4577 static tree reshape_init_r (tree, reshape_iter *, bool);
4579 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4580 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4581 initialized. If there are no more such fields, the return value
4585 next_initializable_field (tree field)
4588 && (TREE_CODE (field) != FIELD_DECL
4589 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4590 || DECL_ARTIFICIAL (field)))
4591 field = TREE_CHAIN (field);
4596 /* Subroutine of reshape_init_array and reshape_init_vector, which does
4597 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
4598 INTEGER_CST representing the size of the array minus one (the maximum index),
4599 or NULL_TREE if the array was declared without specifying the size. D is
4600 the iterator within the constructor. */
4603 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d)
4606 bool sized_array_p = (max_index != NULL_TREE);
4607 unsigned HOST_WIDE_INT max_index_cst = 0;
4608 unsigned HOST_WIDE_INT index;
4610 /* The initializer for an array is always a CONSTRUCTOR. */
4611 new_init = build_constructor (init_list_type_node, NULL);
4615 /* Minus 1 is used for zero sized arrays. */
4616 if (integer_all_onesp (max_index))
4619 if (host_integerp (max_index, 1))
4620 max_index_cst = tree_low_cst (max_index, 1);
4621 /* sizetype is sign extended, not zero extended. */
4623 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
4627 /* Loop until there are no more initializers. */
4629 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
4634 check_array_designated_initializer (d->cur);
4635 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false);
4636 if (elt_init == error_mark_node)
4637 return error_mark_node;
4638 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), NULL_TREE, elt_init);
4644 /* Subroutine of reshape_init_r, processes the initializers for arrays.
4645 Parameters are the same of reshape_init_r. */
4648 reshape_init_array (tree type, reshape_iter *d)
4650 tree max_index = NULL_TREE;
4652 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
4654 if (TYPE_DOMAIN (type))
4655 max_index = array_type_nelts (type);
4657 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4660 /* Subroutine of reshape_init_r, processes the initializers for vectors.
4661 Parameters are the same of reshape_init_r. */
4664 reshape_init_vector (tree type, reshape_iter *d)
4666 tree max_index = NULL_TREE;
4669 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
4671 if (COMPOUND_LITERAL_P (d->cur->value))
4673 tree value = d->cur->value;
4674 if (!same_type_p (TREE_TYPE (value), type))
4676 error ("invalid type %qT as initializer for a vector of type %qT",
4677 TREE_TYPE (d->cur->value), type);
4678 value = error_mark_node;
4684 /* For a vector, the representation type is a struct
4685 containing a single member which is an array of the
4686 appropriate size. */
4687 rtype = TYPE_DEBUG_REPRESENTATION_TYPE (type);
4688 if (rtype && TYPE_DOMAIN (TREE_TYPE (TYPE_FIELDS (rtype))))
4689 max_index = array_type_nelts (TREE_TYPE (TYPE_FIELDS (rtype)));
4691 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4694 /* Subroutine of reshape_init_r, processes the initializers for classes
4695 or union. Parameters are the same of reshape_init_r. */
4698 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p)
4703 gcc_assert (CLASS_TYPE_P (type));
4705 /* The initializer for a class is always a CONSTRUCTOR. */
4706 new_init = build_constructor (init_list_type_node, NULL);
4707 field = next_initializable_field (TYPE_FIELDS (type));
4713 An initializer for an aggregate member that is an
4714 empty class shall have the form of an empty
4715 initializer-list {}. */
4716 if (!first_initializer_p)
4718 error ("initializer for %qT must be brace-enclosed", type);
4719 return error_mark_node;
4724 /* Loop through the initializable fields, gathering initializers. */
4725 while (d->cur != d->end)
4729 /* Handle designated initializers, as an extension. */
4732 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
4734 if (!field || TREE_CODE (field) != FIELD_DECL)
4736 error ("%qT has no non-static data member named %qD", type,
4738 return error_mark_node;
4742 /* If we processed all the member of the class, we are done. */
4746 field_init = reshape_init_r (TREE_TYPE (field), d,
4747 /*first_initializer_p=*/false);
4748 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
4752 When a union is initialized with a brace-enclosed
4753 initializer, the braces shall only contain an
4754 initializer for the first member of the union. */
4755 if (TREE_CODE (type) == UNION_TYPE)
4758 field = next_initializable_field (TREE_CHAIN (field));
4764 /* Subroutine of reshape_init, which processes a single initializer (part of
4765 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
4766 iterator within the CONSTRUCTOR which points to the initializer to process.
4767 FIRST_INITIALIZER_P is true if this is the first initializer of the
4768 CONSTRUCTOR node. */
4771 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p)
4773 tree init = d->cur->value;
4775 if (error_operand_p (init))
4776 return error_mark_node;
4778 /* A non-aggregate type is always initialized with a single
4780 if (!CP_AGGREGATE_TYPE_P (type))
4782 /* It is invalid to initialize a non-aggregate type with a
4783 brace-enclosed initializer before C++0x.
4784 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
4785 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
4786 a CONSTRUCTOR (with a record type). */
4787 if (TREE_CODE (init) == CONSTRUCTOR
4788 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
4790 if (SCALAR_TYPE_P (type))
4792 error ("braces around scalar initializer for type %qT", type);
4793 init = error_mark_node;
4796 maybe_warn_cpp0x ("extended initializer lists");
4805 All implicit type conversions (clause _conv_) are considered when
4806 initializing the aggregate member with an initializer from an
4807 initializer-list. If the initializer can initialize a member,
4808 the member is initialized. Otherwise, if the member is itself a
4809 non-empty subaggregate, brace elision is assumed and the
4810 initializer is considered for the initialization of the first
4811 member of the subaggregate. */
4812 if (TREE_CODE (init) != CONSTRUCTOR
4813 && can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL))
4819 /* [dcl.init.string]
4821 A char array (whether plain char, signed char, or unsigned char)
4822 can be initialized by a string-literal (optionally enclosed in
4823 braces); a wchar_t array can be initialized by a wide
4824 string-literal (optionally enclosed in braces). */
4825 if (TREE_CODE (type) == ARRAY_TYPE
4826 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
4828 tree str_init = init;
4830 /* Strip one level of braces if and only if they enclose a single
4831 element (as allowed by [dcl.init.string]). */
4832 if (!first_initializer_p
4833 && TREE_CODE (str_init) == CONSTRUCTOR
4834 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (str_init)) == 1)
4836 str_init = VEC_index (constructor_elt,
4837 CONSTRUCTOR_ELTS (str_init), 0)->value;
4840 /* If it's a string literal, then it's the initializer for the array
4841 as a whole. Otherwise, continue with normal initialization for
4842 array types (one value per array element). */
4843 if (TREE_CODE (str_init) == STRING_CST)
4850 /* The following cases are about aggregates. If we are not within a full
4851 initializer already, and there is not a CONSTRUCTOR, it means that there
4852 is a missing set of braces (that is, we are processing the case for
4853 which reshape_init exists). */
4854 if (!first_initializer_p)
4856 if (TREE_CODE (init) == CONSTRUCTOR)
4858 if (TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init)))
4859 /* There is no need to reshape pointer-to-member function
4860 initializers, as they are always constructed correctly
4861 by the front end. */
4863 else if (COMPOUND_LITERAL_P (init))
4864 /* For a nested compound literal, there is no need to reshape since
4865 brace elision is not allowed. Even if we decided to allow it,
4866 we should add a call to reshape_init in finish_compound_literal,
4867 before calling digest_init, so changing this code would still
4868 not be necessary. */
4869 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
4873 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
4874 return reshape_init (type, init);
4878 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
4882 /* Dispatch to specialized routines. */
4883 if (CLASS_TYPE_P (type))
4884 return reshape_init_class (type, d, first_initializer_p);
4885 else if (TREE_CODE (type) == ARRAY_TYPE)
4886 return reshape_init_array (type, d);
4887 else if (TREE_CODE (type) == VECTOR_TYPE)
4888 return reshape_init_vector (type, d);
4893 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
4894 brace-enclosed aggregate initializer.
4896 INIT is the CONSTRUCTOR containing the list of initializers describing
4897 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
4898 It may not presently match the shape of the TYPE; for example:
4900 struct S { int a; int b; };
4901 struct S a[] = { 1, 2, 3, 4 };
4903 Here INIT will hold a VEC of four elements, rather than a
4904 VEC of two elements, each itself a VEC of two elements. This
4905 routine transforms INIT from the former form into the latter. The
4906 revised CONSTRUCTOR node is returned. */
4909 reshape_init (tree type, tree init)
4911 VEC(constructor_elt, gc) *v;
4915 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
4917 v = CONSTRUCTOR_ELTS (init);
4919 /* An empty constructor does not need reshaping, and it is always a valid
4921 if (VEC_empty (constructor_elt, v))
4924 /* Recurse on this CONSTRUCTOR. */
4925 d.cur = VEC_index (constructor_elt, v, 0);
4926 d.end = d.cur + VEC_length (constructor_elt, v);
4928 new_init = reshape_init_r (type, &d, true);
4929 if (new_init == error_mark_node)
4930 return error_mark_node;
4932 /* Make sure all the element of the constructor were used. Otherwise,
4933 issue an error about exceeding initializers. */
4935 error ("too many initializers for %qT", type);
4940 /* Verify array initializer. Returns true if errors have been reported. */
4943 check_array_initializer (tree decl, tree type, tree init)
4945 tree element_type = TREE_TYPE (type);
4947 /* The array type itself need not be complete, because the
4948 initializer may tell us how many elements are in the array.
4949 But, the elements of the array must be complete. */
4950 if (!COMPLETE_TYPE_P (complete_type (element_type)))
4953 error ("elements of array %q#D have incomplete type", decl);
4955 error ("elements of array %q#T have incomplete type", type);
4958 /* It is not valid to initialize a VLA. */
4960 && ((COMPLETE_TYPE_P (type) && !TREE_CONSTANT (TYPE_SIZE (type)))
4961 || !TREE_CONSTANT (TYPE_SIZE (element_type))))
4964 error ("variable-sized object %qD may not be initialized", decl);
4966 error ("variable-sized compound literal");
4972 /* Subroutine of check_initializer; args are passed down from that function.
4973 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
4976 build_aggr_init_full_exprs (tree decl, tree init, int flags)
4979 int saved_stmts_are_full_exprs_p = 0;
4980 if (building_stmt_tree ())
4982 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
4983 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
4985 init = build_aggr_init (decl, init, flags, tf_warning_or_error);
4986 if (building_stmt_tree ())
4987 current_stmt_tree ()->stmts_are_full_exprs_p =
4988 saved_stmts_are_full_exprs_p;
4992 /* Verify INIT (the initializer for DECL), and record the
4993 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
4994 grok_reference_init.
4996 If the return value is non-NULL, it is an expression that must be
4997 evaluated dynamically to initialize DECL. */
5000 check_initializer (tree decl, tree init, int flags, tree *cleanup)
5002 tree type = TREE_TYPE (decl);
5003 tree init_code = NULL;
5005 /* Things that are going to be initialized need to have complete
5007 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
5009 if (type == error_mark_node)
5010 /* We will have already complained. */
5013 if (TREE_CODE (type) == ARRAY_TYPE)
5015 if (check_array_initializer (decl, type, init))
5018 else if (!COMPLETE_TYPE_P (type))
5020 error ("%qD has incomplete type", decl);
5021 TREE_TYPE (decl) = error_mark_node;
5025 /* There is no way to make a variable-sized class type in GNU C++. */
5026 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
5028 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5030 int init_len = VEC_length (constructor_elt, CONSTRUCTOR_ELTS (init));
5031 if (SCALAR_TYPE_P (type))
5035 maybe_warn_cpp0x ("extended initializer lists");
5036 init = build_zero_init (type, NULL_TREE, false);
5038 else if (init_len != 1)
5040 error ("scalar object %qD requires one element in initializer",
5042 TREE_TYPE (decl) = error_mark_node;
5048 if (TREE_CODE (decl) == CONST_DECL)
5050 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
5052 DECL_INITIAL (decl) = init;
5054 gcc_assert (init != NULL_TREE);
5057 else if (!DECL_EXTERNAL (decl) && TREE_CODE (type) == REFERENCE_TYPE)
5058 init = grok_reference_init (decl, type, init, cleanup);
5061 /* Do not reshape constructors of vectors (they don't need to be
5063 if (BRACE_ENCLOSED_INITIALIZER_P (init))
5065 if (is_std_init_list (type))
5066 return build_init_list_var_init (decl, type, init, cleanup);
5067 else if (TYPE_NON_AGGREGATE_CLASS (type))
5069 /* Don't reshape if the class has constructors. */
5070 if (cxx_dialect == cxx98)
5071 error ("in C++98 %qD must be initialized by constructor, "
5074 init = build_tree_list (NULL_TREE, init);
5076 else if ((*targetm.vector_opaque_p) (type))
5078 error ("opaque vector types cannot be initialized");
5079 init = error_mark_node;
5082 init = reshape_init (type, init);
5085 /* If DECL has an array type without a specific bound, deduce the
5086 array size from the initializer. */
5087 maybe_deduce_size_from_array_init (decl, init);
5088 type = TREE_TYPE (decl);
5089 if (type == error_mark_node)
5092 if (TYPE_NEEDS_CONSTRUCTING (type)
5093 || (CLASS_TYPE_P (type)
5094 && !BRACE_ENCLOSED_INITIALIZER_P (init)))
5095 return build_aggr_init_full_exprs (decl, init, flags);
5096 else if (TREE_CODE (init) != TREE_VEC)
5098 init_code = store_init_value (decl, init);
5099 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
5100 && DECL_INITIAL (decl)
5101 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
5102 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
5103 warning (0, "array %qD initialized by parenthesized string literal %qE",
5104 decl, DECL_INITIAL (decl));
5108 else if (DECL_EXTERNAL (decl))
5110 else if (TYPE_P (type) && TYPE_NEEDS_CONSTRUCTING (type))
5111 return build_aggr_init_full_exprs (decl, init, flags);
5112 else if (MAYBE_CLASS_TYPE_P (type))
5114 tree core_type = strip_array_types (type);
5116 if (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type))
5117 error ("structure %qD with uninitialized const members", decl);
5118 if (CLASSTYPE_REF_FIELDS_NEED_INIT (core_type))
5119 error ("structure %qD with uninitialized reference members", decl);
5121 check_for_uninitialized_const_var (decl);
5124 check_for_uninitialized_const_var (decl);
5126 if (init && init != error_mark_node)
5127 init_code = build2 (INIT_EXPR, type, decl, init);
5132 /* If DECL is not a local variable, give it RTL. */
5135 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
5137 int toplev = toplevel_bindings_p ();
5139 const char *filename;
5141 /* Set the DECL_ASSEMBLER_NAME for the object. */
5144 /* The `register' keyword, when used together with an
5145 asm-specification, indicates that the variable should be
5146 placed in a particular register. */
5147 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
5149 set_user_assembler_name (decl, asmspec);
5150 DECL_HARD_REGISTER (decl) = 1;
5154 if (TREE_CODE (decl) == FUNCTION_DECL
5155 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
5156 set_builtin_user_assembler_name (decl, asmspec);
5157 set_user_assembler_name (decl, asmspec);
5161 /* Handle non-variables up front. */
5162 if (TREE_CODE (decl) != VAR_DECL)
5164 rest_of_decl_compilation (decl, toplev, at_eof);
5168 /* If we see a class member here, it should be a static data
5170 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
5172 gcc_assert (TREE_STATIC (decl));
5173 /* An in-class declaration of a static data member should be
5174 external; it is only a declaration, and not a definition. */
5175 if (init == NULL_TREE)
5176 gcc_assert (DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl));
5179 /* We don't create any RTL for local variables. */
5180 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5183 /* We defer emission of local statics until the corresponding
5184 DECL_EXPR is expanded. */
5185 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
5187 /* We try to defer namespace-scope static constants so that they are
5188 not emitted into the object file unnecessarily. */
5189 filename = input_filename;
5190 if (!DECL_VIRTUAL_P (decl)
5191 && TREE_READONLY (decl)
5192 && DECL_INITIAL (decl) != NULL_TREE
5193 && DECL_INITIAL (decl) != error_mark_node
5195 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
5197 && !TREE_PUBLIC (decl))
5199 /* Fool with the linkage of static consts according to #pragma
5201 struct c_fileinfo *finfo = get_fileinfo (filename);
5202 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
5204 TREE_PUBLIC (decl) = 1;
5205 DECL_EXTERNAL (decl) = finfo->interface_only;
5210 /* Likewise for template instantiations. */
5211 else if (DECL_LANG_SPECIFIC (decl)
5212 && DECL_IMPLICIT_INSTANTIATION (decl))
5215 /* If we're not deferring, go ahead and assemble the variable. */
5217 rest_of_decl_compilation (decl, toplev, at_eof);
5220 /* walk_tree helper for wrap_temporary_cleanups, below. */
5223 wrap_cleanups_r (tree *stmt_p, int *walk_subtrees, void *data)
5225 if (TYPE_P (*stmt_p))
5231 if (TREE_CODE (*stmt_p) == TARGET_EXPR)
5233 tree guard = (tree)data;
5234 tree tcleanup = TARGET_EXPR_CLEANUP (*stmt_p);
5236 tcleanup = build2 (TRY_CATCH_EXPR, void_type_node, tcleanup, guard);
5237 /* Tell honor_protect_cleanup_actions to handle this as a separate
5239 TRY_CATCH_IS_CLEANUP (tcleanup) = 1;
5241 TARGET_EXPR_CLEANUP (*stmt_p) = tcleanup;
5247 /* We're initializing a local variable which has a cleanup GUARD. If there
5248 are any temporaries used in the initializer INIT of this variable, we
5249 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
5250 variable will be cleaned up properly if one of them throws.
5252 Unfortunately, there's no way to express this properly in terms of
5253 nesting, as the regions for the temporaries overlap the region for the
5254 variable itself; if there are two temporaries, the variable needs to be
5255 the first thing destroyed if either of them throws. However, we only
5256 want to run the variable's cleanup if it actually got constructed. So
5257 we need to guard the temporary cleanups with the variable's cleanup if
5258 they are run on the normal path, but not if they are run on the
5259 exceptional path. We implement this by telling
5260 honor_protect_cleanup_actions to strip the variable cleanup from the
5261 exceptional path. */
5264 wrap_temporary_cleanups (tree init, tree guard)
5266 cp_walk_tree_without_duplicates (&init, wrap_cleanups_r, (void *)guard);
5269 /* Generate code to initialize DECL (a local variable). */
5272 initialize_local_var (tree decl, tree init)
5274 tree type = TREE_TYPE (decl);
5278 gcc_assert (TREE_CODE (decl) == VAR_DECL
5279 || TREE_CODE (decl) == RESULT_DECL);
5280 gcc_assert (!TREE_STATIC (decl));
5282 if (DECL_SIZE (decl) == NULL_TREE)
5284 /* If we used it already as memory, it must stay in memory. */
5285 DECL_INITIAL (decl) = NULL_TREE;
5286 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
5290 if (type == error_mark_node)
5293 /* Compute and store the initial value. */
5294 already_used = TREE_USED (decl) || TREE_USED (type);
5296 /* Generate a cleanup, if necessary. */
5297 cleanup = cxx_maybe_build_cleanup (decl);
5299 /* Perform the initialization. */
5302 int saved_stmts_are_full_exprs_p;
5304 /* If we're only initializing a single object, guard the destructors
5305 of any temporaries used in its initializer with its destructor.
5306 This isn't right for arrays because each element initialization is
5307 a full-expression. */
5308 if (cleanup && TREE_CODE (type) != ARRAY_TYPE)
5309 wrap_temporary_cleanups (init, cleanup);
5311 gcc_assert (building_stmt_tree ());
5312 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5313 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5314 finish_expr_stmt (init);
5315 current_stmt_tree ()->stmts_are_full_exprs_p =
5316 saved_stmts_are_full_exprs_p;
5319 /* Set this to 0 so we can tell whether an aggregate which was
5320 initialized was ever used. Don't do this if it has a
5321 destructor, so we don't complain about the 'resource
5322 allocation is initialization' idiom. Now set
5323 attribute((unused)) on types so decls of that type will be
5324 marked used. (see TREE_USED, above.) */
5325 if (TYPE_NEEDS_CONSTRUCTING (type)
5327 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
5328 && DECL_NAME (decl))
5329 TREE_USED (decl) = 0;
5330 else if (already_used)
5331 TREE_USED (decl) = 1;
5334 finish_decl_cleanup (decl, cleanup);
5337 /* DECL is a VAR_DECL for a compiler-generated variable with static
5338 storage duration (like a virtual table) whose initializer is a
5339 compile-time constant. INIT must be either a TREE_LIST of values,
5340 or a CONSTRUCTOR. Initialize the variable and provide it to the
5344 initialize_artificial_var (tree decl, tree init)
5346 gcc_assert (DECL_ARTIFICIAL (decl));
5347 if (TREE_CODE (init) == TREE_LIST)
5348 init = build_constructor_from_list (TREE_TYPE (decl), init);
5349 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
5350 DECL_INITIAL (decl) = init;
5351 DECL_INITIALIZED_P (decl) = 1;
5352 determine_visibility (decl);
5353 layout_var_decl (decl);
5354 maybe_commonize_var (decl);
5355 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
5358 /* INIT is the initializer for a variable, as represented by the
5359 parser. Returns true iff INIT is value-dependent. */
5362 value_dependent_init_p (tree init)
5364 if (TREE_CODE (init) == TREE_LIST)
5365 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5366 return any_value_dependent_elements_p (init);
5367 else if (TREE_CODE (init) == CONSTRUCTOR)
5368 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5370 VEC(constructor_elt, gc) *elts;
5374 elts = CONSTRUCTOR_ELTS (init);
5375 nelts = VEC_length (constructor_elt, elts);
5376 for (i = 0; i < nelts; ++i)
5377 if (value_dependent_init_p (VEC_index (constructor_elt,
5382 /* It must be a simple expression, e.g., int i = 3; */
5383 return value_dependent_expression_p (init);
5388 /* Finish processing of a declaration;
5389 install its line number and initial value.
5390 If the length of an array type is not known before,
5391 it must be determined now, from the initial value, or it is an error.
5393 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
5394 true, then INIT is an integral constant expression.
5396 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
5397 if the (init) syntax was used. */
5400 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
5401 tree asmspec_tree, int flags)
5405 const char *asmspec = NULL;
5406 int was_readonly = 0;
5407 bool var_definition_p = false;
5408 int saved_processing_template_decl;
5410 if (decl == error_mark_node)
5415 error ("assignment (not initialization) in declaration");
5419 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
5420 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
5421 gcc_assert (TREE_CODE (decl) != PARM_DECL);
5423 type = TREE_TYPE (decl);
5424 if (type == error_mark_node)
5427 /* Assume no cleanup is required. */
5428 cleanup = NULL_TREE;
5429 saved_processing_template_decl = processing_template_decl;
5431 /* If a name was specified, get the string. */
5432 if (global_scope_p (current_binding_level))
5433 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
5434 if (asmspec_tree && asmspec_tree != error_mark_node)
5435 asmspec = TREE_STRING_POINTER (asmspec_tree);
5437 if (current_class_type
5438 && CP_DECL_CONTEXT (decl) == current_class_type
5439 && TYPE_BEING_DEFINED (current_class_type)
5440 && (DECL_INITIAL (decl) || init))
5441 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
5443 if (processing_template_decl)
5445 bool type_dependent_p;
5447 /* Add this declaration to the statement-tree. */
5448 if (at_function_scope_p ())
5449 add_decl_expr (decl);
5451 type_dependent_p = dependent_type_p (type);
5453 if (check_for_bare_parameter_packs (init))
5456 DECL_INITIAL (decl) = NULL_TREE;
5459 if (init && init_const_expr_p)
5461 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5462 if (DECL_INTEGRAL_CONSTANT_VAR_P (decl))
5463 TREE_CONSTANT (decl) = 1;
5466 /* Generally, initializers in templates are expanded when the
5467 template is instantiated. But, if DECL is an integral
5468 constant static data member, then it can be used in future
5469 integral constant expressions, and its value must be
5472 && DECL_CLASS_SCOPE_P (decl)
5473 && DECL_INTEGRAL_CONSTANT_VAR_P (decl)
5474 && !type_dependent_p
5475 && !value_dependent_init_p (init)))
5478 DECL_INITIAL (decl) = init;
5479 if (TREE_CODE (decl) == VAR_DECL
5480 && !DECL_PRETTY_FUNCTION_P (decl)
5481 && !type_dependent_p)
5482 maybe_deduce_size_from_array_init (decl, init);
5486 if (TREE_CODE (init) == TREE_LIST)
5488 /* If the parenthesized-initializer form was used (e.g.,
5489 "int A<N>::i(X)"), then INIT will be a TREE_LIST of initializer
5490 arguments. (There is generally only one.) We convert them
5493 for (; list; list = TREE_CHAIN (list))
5495 tree elt = TREE_VALUE (list);
5496 TREE_VALUE (list) = fold_non_dependent_expr (elt);
5500 init = fold_non_dependent_expr (init);
5501 processing_template_decl = 0;
5504 /* Take care of TYPE_DECLs up front. */
5505 if (TREE_CODE (decl) == TYPE_DECL)
5507 if (type != error_mark_node
5508 && MAYBE_CLASS_TYPE_P (type) && DECL_NAME (decl))
5510 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
5511 warning (0, "shadowing previous type declaration of %q#D", decl);
5512 set_identifier_type_value (DECL_NAME (decl), decl);
5515 /* If we have installed this as the canonical typedef for this
5516 type, and that type has not been defined yet, delay emitting
5517 the debug information for it, as we will emit it later. */
5518 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
5519 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
5520 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
5522 rest_of_decl_compilation (decl, DECL_CONTEXT (decl) == NULL_TREE,
5527 /* A reference will be modified here, as it is initialized. */
5528 if (! DECL_EXTERNAL (decl)
5529 && TREE_READONLY (decl)
5530 && TREE_CODE (type) == REFERENCE_TYPE)
5533 TREE_READONLY (decl) = 0;
5536 if (TREE_CODE (decl) == VAR_DECL)
5538 /* Only PODs can have thread-local storage. Other types may require
5539 various kinds of non-trivial initialization. */
5540 if (DECL_THREAD_LOCAL_P (decl) && !pod_type_p (TREE_TYPE (decl)))
5541 error ("%qD cannot be thread-local because it has non-POD type %qT",
5542 decl, TREE_TYPE (decl));
5543 /* If this is a local variable that will need a mangled name,
5544 register it now. We must do this before processing the
5545 initializer for the variable, since the initialization might
5546 require a guard variable, and since the mangled name of the
5547 guard variable will depend on the mangled name of this
5549 if (DECL_FUNCTION_SCOPE_P (decl)
5550 && TREE_STATIC (decl)
5551 && !DECL_ARTIFICIAL (decl))
5552 push_local_name (decl);
5553 /* Convert the initializer to the type of DECL, if we have not
5554 already initialized DECL. */
5555 if (!DECL_INITIALIZED_P (decl)
5556 /* If !DECL_EXTERNAL then DECL is being defined. In the
5557 case of a static data member initialized inside the
5558 class-specifier, there can be an initializer even if DECL
5559 is *not* defined. */
5560 && (!DECL_EXTERNAL (decl) || init))
5562 if (TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
5565 = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
5566 /* Allow libjava/prims.cc define primitive classes. */
5567 if (init != NULL_TREE
5568 || jclass == NULL_TREE
5569 || TREE_CODE (jclass) != TYPE_DECL
5570 || !POINTER_TYPE_P (TREE_TYPE (jclass))
5571 || !same_type_ignoring_top_level_qualifiers_p
5572 (type, TREE_TYPE (TREE_TYPE (jclass))))
5573 error ("Java object %qD not allocated with %<new%>", decl);
5578 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
5579 if (init_const_expr_p)
5581 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5582 if (DECL_INTEGRAL_CONSTANT_VAR_P (decl))
5583 TREE_CONSTANT (decl) = 1;
5586 init = check_initializer (decl, init, flags, &cleanup);
5587 /* Thread-local storage cannot be dynamically initialized. */
5588 if (DECL_THREAD_LOCAL_P (decl) && init)
5590 error ("%qD is thread-local and so cannot be dynamically "
5591 "initialized", decl);
5595 /* Check that the initializer for a static data member was a
5596 constant. Although we check in the parser that the
5597 initializer is an integral constant expression, we do not
5598 simplify division-by-zero at the point at which it
5599 occurs. Therefore, in:
5601 struct S { static const int i = 7 / 0; };
5603 we issue an error at this point. It would
5604 probably be better to forbid division by zero in
5605 integral constant expressions. */
5606 if (DECL_EXTERNAL (decl) && init)
5608 error ("%qD cannot be initialized by a non-constant expression"
5609 " when being declared", decl);
5610 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
5618 The memory occupied by any object of static storage
5619 duration is zero-initialized at program startup before
5620 any other initialization takes place.
5622 We cannot create an appropriate initializer until after
5623 the type of DECL is finalized. If DECL_INITIAL is set,
5624 then the DECL is statically initialized, and any
5625 necessary zero-initialization has already been performed. */
5626 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
5627 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
5628 /*nelts=*/NULL_TREE,
5629 /*static_storage_p=*/true);
5630 /* Remember that the initialization for this variable has
5632 DECL_INITIALIZED_P (decl) = 1;
5633 /* This declaration is the definition of this variable,
5634 unless we are initializing a static data member within
5635 the class specifier. */
5636 if (!DECL_EXTERNAL (decl))
5637 var_definition_p = true;
5639 /* If the variable has an array type, lay out the type, even if
5640 there is no initializer. It is valid to index through the
5641 array, and we must get TYPE_ALIGN set correctly on the array
5643 else if (TREE_CODE (type) == ARRAY_TYPE)
5646 else if (TREE_CODE (decl) == FIELD_DECL
5647 && TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
5648 error ("non-static data member %qD has Java class type", decl);
5650 /* Add this declaration to the statement-tree. This needs to happen
5651 after the call to check_initializer so that the DECL_EXPR for a
5652 reference temp is added before the DECL_EXPR for the reference itself. */
5653 if (at_function_scope_p ())
5654 add_decl_expr (decl);
5656 /* Let the middle end know about variables and functions -- but not
5657 static data members in uninstantiated class templates. */
5658 if (!saved_processing_template_decl
5659 && (TREE_CODE (decl) == VAR_DECL
5660 || TREE_CODE (decl) == FUNCTION_DECL))
5662 if (TREE_CODE (decl) == VAR_DECL)
5664 layout_var_decl (decl);
5665 maybe_commonize_var (decl);
5668 /* This needs to happen after the linkage is set. */
5669 determine_visibility (decl);
5671 if (var_definition_p && TREE_STATIC (decl))
5673 /* If a TREE_READONLY variable needs initialization
5674 at runtime, it is no longer readonly and we need to
5675 avoid MEM_READONLY_P being set on RTL created for it. */
5678 if (TREE_READONLY (decl))
5679 TREE_READONLY (decl) = 0;
5682 else if (was_readonly)
5683 TREE_READONLY (decl) = 1;
5686 make_rtl_for_nonlocal_decl (decl, init, asmspec);
5688 /* Check for abstractness of the type. Notice that there is no
5689 need to strip array types here since the check for those types
5690 is already done within create_array_type_for_decl. */
5691 if (TREE_CODE (type) == FUNCTION_TYPE
5692 || TREE_CODE (type) == METHOD_TYPE)
5693 abstract_virtuals_error (decl, TREE_TYPE (type));
5695 abstract_virtuals_error (decl, type);
5697 if (TREE_TYPE (decl) == error_mark_node)
5698 /* No initialization required. */
5700 else if (TREE_CODE (decl) == FUNCTION_DECL)
5704 if (init == ridpointers[(int)RID_DELETE])
5706 /* fixme check this is 1st decl */
5707 DECL_DELETED_FN (decl) = 1;
5708 DECL_DECLARED_INLINE_P (decl) = 1;
5709 DECL_INITIAL (decl) = error_mark_node;
5711 else if (init == ridpointers[(int)RID_DEFAULT])
5713 if (!defaultable_fn_p (decl))
5714 error ("%qD cannot be defaulted", decl);
5717 /* An out-of-class default definition is defined at
5718 the point where it is explicitly defaulted. */
5719 DECL_DEFAULTED_FN (decl) = 1;
5720 if (DECL_INITIAL (decl) == error_mark_node)
5721 synthesize_method (decl);
5725 error ("function %q#D is initialized like a variable", decl);
5727 /* else no initialization required. */
5729 else if (DECL_EXTERNAL (decl)
5730 && ! (DECL_LANG_SPECIFIC (decl)
5731 && DECL_NOT_REALLY_EXTERN (decl)))
5734 DECL_INITIAL (decl) = init;
5736 /* A variable definition. */
5737 else if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5738 /* Initialize the local variable. */
5739 initialize_local_var (decl, init);
5741 /* If a variable is defined, and then a subsequent
5742 definition with external linkage is encountered, we will
5743 get here twice for the same variable. We want to avoid
5744 calling expand_static_init more than once. For variables
5745 that are not static data members, we can call
5746 expand_static_init only when we actually process the
5747 initializer. It is not legal to redeclare a static data
5748 member, so this issue does not arise in that case. */
5749 else if (var_definition_p && TREE_STATIC (decl))
5750 expand_static_init (decl, init);
5753 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
5754 reference, insert it in the statement-tree now. */
5756 push_cleanup (decl, cleanup, false);
5759 processing_template_decl = saved_processing_template_decl;
5762 TREE_READONLY (decl) = 1;
5764 /* If this was marked 'used', be sure it will be output. */
5765 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
5766 mark_decl_referenced (decl);
5769 /* This is here for a midend callback from c-common.c. */
5772 finish_decl (tree decl, tree init, tree asmspec_tree)
5774 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, asmspec_tree, 0);
5777 /* Returns a declaration for a VAR_DECL as if:
5779 extern "C" TYPE NAME;
5781 had been seen. Used to create compiler-generated global
5785 declare_global_var (tree name, tree type)
5789 push_to_top_level ();
5790 decl = build_decl (VAR_DECL, name, type);
5791 TREE_PUBLIC (decl) = 1;
5792 DECL_EXTERNAL (decl) = 1;
5793 DECL_ARTIFICIAL (decl) = 1;
5794 /* If the user has explicitly declared this variable (perhaps
5795 because the code we are compiling is part of a low-level runtime
5796 library), then it is possible that our declaration will be merged
5797 with theirs by pushdecl. */
5798 decl = pushdecl (decl);
5799 finish_decl (decl, NULL_TREE, NULL_TREE);
5800 pop_from_top_level ();
5805 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
5806 if "__cxa_atexit" is not being used) corresponding to the function
5807 to be called when the program exits. */
5810 get_atexit_fn_ptr_type (void)
5815 if (!atexit_fn_ptr_type_node)
5817 if (flag_use_cxa_atexit
5818 && !targetm.cxx.use_atexit_for_cxa_atexit ())
5819 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
5820 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
5822 /* The parameter to "atexit" is "void (*)(void)". */
5823 arg_types = void_list_node;
5825 fn_type = build_function_type (void_type_node, arg_types);
5826 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
5829 return atexit_fn_ptr_type_node;
5832 /* Returns a pointer to the `atexit' function. Note that if
5833 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
5834 `__cxa_atexit' function specified in the IA64 C++ ABI. */
5837 get_atexit_node (void)
5844 bool use_aeabi_atexit;
5849 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
5851 /* The declaration for `__cxa_atexit' is:
5853 int __cxa_atexit (void (*)(void *), void *, void *)
5855 We build up the argument types and then then function type
5858 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
5859 /* First, build the pointer-to-function type for the first
5861 fn_ptr_type = get_atexit_fn_ptr_type ();
5862 /* Then, build the rest of the argument types. */
5863 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
5864 if (use_aeabi_atexit)
5866 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
5867 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
5871 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
5872 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
5874 /* And the final __cxa_atexit type. */
5875 fn_type = build_function_type (integer_type_node, arg_types);
5876 fn_ptr_type = build_pointer_type (fn_type);
5877 if (use_aeabi_atexit)
5878 name = "__aeabi_atexit";
5880 name = "__cxa_atexit";
5884 /* The declaration for `atexit' is:
5886 int atexit (void (*)());
5888 We build up the argument types and then then function type
5890 fn_ptr_type = get_atexit_fn_ptr_type ();
5891 arg_types = tree_cons (NULL_TREE, fn_ptr_type, void_list_node);
5892 /* Build the final atexit type. */
5893 fn_type = build_function_type (integer_type_node, arg_types);
5897 /* Now, build the function declaration. */
5898 push_lang_context (lang_name_c);
5899 atexit_fndecl = build_library_fn_ptr (name, fn_type);
5900 mark_used (atexit_fndecl);
5901 pop_lang_context ();
5902 atexit_node = decay_conversion (atexit_fndecl);
5907 /* Returns the __dso_handle VAR_DECL. */
5910 get_dso_handle_node (void)
5912 if (dso_handle_node)
5913 return dso_handle_node;
5915 /* Declare the variable. */
5916 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
5919 return dso_handle_node;
5922 /* Begin a new function with internal linkage whose job will be simply
5923 to destroy some particular variable. */
5925 static GTY(()) int start_cleanup_cnt;
5928 start_cleanup_fn (void)
5933 bool use_cxa_atexit = flag_use_cxa_atexit
5934 && !targetm.cxx.use_atexit_for_cxa_atexit ();
5936 push_to_top_level ();
5938 /* No need to mangle this. */
5939 push_lang_context (lang_name_c);
5941 /* Build the name of the function. */
5942 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
5943 /* Build the function declaration. */
5944 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
5945 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
5946 /* It's a function with internal linkage, generated by the
5948 TREE_PUBLIC (fndecl) = 0;
5949 DECL_ARTIFICIAL (fndecl) = 1;
5950 /* Make the function `inline' so that it is only emitted if it is
5951 actually needed. It is unlikely that it will be inlined, since
5952 it is only called via a function pointer, but we avoid unnecessary
5953 emissions this way. */
5954 DECL_INTERFACE_KNOWN (fndecl) = 1;
5955 /* Build the parameter. */
5960 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
5961 DECL_CONTEXT (parmdecl) = fndecl;
5962 TREE_USED (parmdecl) = 1;
5963 DECL_ARGUMENTS (fndecl) = parmdecl;
5967 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
5969 pop_lang_context ();
5971 return current_function_decl;
5974 /* Finish the cleanup function begun by start_cleanup_fn. */
5977 end_cleanup_fn (void)
5979 expand_or_defer_fn (finish_function (0));
5981 pop_from_top_level ();
5984 /* Generate code to handle the destruction of DECL, an object with
5985 static storage duration. */
5988 register_dtor_fn (tree decl)
5997 type = TREE_TYPE (decl);
5998 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
5999 return void_zero_node;
6001 /* If we're using "__cxa_atexit" (or "__aeabi_atexit"), and DECL is
6002 a class object, we can just pass the destructor to
6003 "__cxa_atexit"; we don't have to build a temporary function to do
6005 use_dtor = (flag_use_cxa_atexit
6006 && !targetm.cxx.use_atexit_for_cxa_atexit ()
6007 && CLASS_TYPE_P (type));
6012 /* Find the destructor. */
6013 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
6014 gcc_assert (idx >= 0);
6015 cleanup = VEC_index (tree, CLASSTYPE_METHOD_VEC (type), idx);
6016 /* Make sure it is accessible. */
6017 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup);
6021 /* Call build_cleanup before we enter the anonymous function so
6022 that any access checks will be done relative to the current
6023 scope, rather than the scope of the anonymous function. */
6024 build_cleanup (decl);
6026 /* Now start the function. */
6027 cleanup = start_cleanup_fn ();
6029 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
6030 to the original function, rather than the anonymous one. That
6031 will make the back end think that nested functions are in use,
6032 which causes confusion. */
6033 push_deferring_access_checks (dk_no_check);
6034 fcall = build_cleanup (decl);
6035 pop_deferring_access_checks ();
6037 /* Create the body of the anonymous function. */
6038 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
6039 finish_expr_stmt (fcall);
6040 finish_compound_stmt (compound_stmt);
6044 /* Call atexit with the cleanup function. */
6045 mark_used (cleanup);
6046 cleanup = build_address (cleanup);
6047 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6053 /* We must convert CLEANUP to the type that "__cxa_atexit"
6055 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
6056 /* "__cxa_atexit" will pass the address of DECL to the
6057 cleanup function. */
6059 addr = build_address (decl);
6060 /* The declared type of the parameter to "__cxa_atexit" is
6061 "void *". For plain "T*", we could just let the
6062 machinery in cp_build_function_call convert it -- but if the
6063 type is "cv-qualified T *", then we need to convert it
6064 before passing it in, to avoid spurious errors. */
6065 addr = build_nop (ptr_type_node, addr);
6068 /* Since the cleanup functions we build ignore the address
6069 they're given, there's no reason to pass the actual address
6070 in, and, in general, it's cheaper to pass NULL than any
6072 addr = null_pointer_node;
6073 args = tree_cons (NULL_TREE,
6074 cp_build_unary_op (ADDR_EXPR, get_dso_handle_node (), 0,
6075 tf_warning_or_error),
6077 if (targetm.cxx.use_aeabi_atexit ())
6079 args = tree_cons (NULL_TREE, cleanup, args);
6080 args = tree_cons (NULL_TREE, addr, args);
6084 args = tree_cons (NULL_TREE, addr, args);
6085 args = tree_cons (NULL_TREE, cleanup, args);
6089 args = tree_cons (NULL_TREE, cleanup, NULL_TREE);
6090 return cp_build_function_call (get_atexit_node (), args,
6091 tf_warning_or_error);
6094 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
6095 is its initializer. Generate code to handle the construction
6096 and destruction of DECL. */
6099 expand_static_init (tree decl, tree init)
6101 gcc_assert (TREE_CODE (decl) == VAR_DECL);
6102 gcc_assert (TREE_STATIC (decl));
6104 /* Some variables require no initialization. */
6106 && !TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))
6107 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
6110 if (DECL_FUNCTION_SCOPE_P (decl))
6112 /* Emit code to perform this initialization but once. */
6113 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
6114 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
6115 tree guard, guard_addr;
6116 tree acquire_fn, release_fn, abort_fn;
6119 /* Emit code to perform this initialization but once. This code
6122 static <type> guard;
6123 if (!guard.first_byte) {
6124 if (__cxa_guard_acquire (&guard)) {
6127 // Do initialization.
6128 flag = true; __cxa_guard_release (&guard);
6129 // Register variable for destruction at end of program.
6131 if (!flag) __cxa_guard_abort (&guard);
6135 Note that the `flag' variable is only set to 1 *after* the
6136 initialization is complete. This ensures that an exception,
6137 thrown during the construction, will cause the variable to
6138 reinitialized when we pass through this code again, as per:
6142 If the initialization exits by throwing an exception, the
6143 initialization is not complete, so it will be tried again
6144 the next time control enters the declaration.
6146 This process should be thread-safe, too; multiple threads
6147 should not be able to initialize the variable more than
6150 /* Create the guard variable. */
6151 guard = get_guard (decl);
6153 /* This optimization isn't safe on targets with relaxed memory
6154 consistency. On such targets we force synchronization in
6155 __cxa_guard_acquire. */
6156 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6158 /* Begin the conditional initialization. */
6159 if_stmt = begin_if_stmt ();
6160 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
6161 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6164 if (flag_threadsafe_statics)
6166 guard_addr = build_address (guard);
6168 acquire_fn = get_identifier ("__cxa_guard_acquire");
6169 release_fn = get_identifier ("__cxa_guard_release");
6170 abort_fn = get_identifier ("__cxa_guard_abort");
6171 if (!get_global_value_if_present (acquire_fn, &acquire_fn))
6173 tree argtypes = tree_cons (NULL_TREE, TREE_TYPE (guard_addr),
6175 tree vfntype = build_function_type (void_type_node, argtypes);
6176 acquire_fn = push_library_fn
6177 (acquire_fn, build_function_type (integer_type_node, argtypes),
6179 release_fn = push_library_fn (release_fn, vfntype, NULL_TREE);
6180 abort_fn = push_library_fn (abort_fn, vfntype, NULL_TREE);
6184 release_fn = identifier_global_value (release_fn);
6185 abort_fn = identifier_global_value (abort_fn);
6188 inner_if_stmt = begin_if_stmt ();
6189 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
6192 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6193 begin = get_target_expr (boolean_false_node);
6194 flag = TARGET_EXPR_SLOT (begin);
6196 TARGET_EXPR_CLEANUP (begin)
6197 = build3 (COND_EXPR, void_type_node, flag,
6199 build_call_n (abort_fn, 1, guard_addr));
6200 CLEANUP_EH_ONLY (begin) = 1;
6202 /* Do the initialization itself. */
6203 init = add_stmt_to_compound (begin, init);
6204 init = add_stmt_to_compound
6205 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
6206 init = add_stmt_to_compound
6207 (init, build_call_n (release_fn, 1, guard_addr));
6210 init = add_stmt_to_compound (init, set_guard (guard));
6212 /* Use atexit to register a function for destroying this static
6214 init = add_stmt_to_compound (init, register_dtor_fn (decl));
6216 finish_expr_stmt (init);
6218 if (flag_threadsafe_statics)
6220 finish_compound_stmt (inner_then_clause);
6221 finish_then_clause (inner_if_stmt);
6222 finish_if_stmt (inner_if_stmt);
6225 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6227 finish_compound_stmt (then_clause);
6228 finish_then_clause (if_stmt);
6229 finish_if_stmt (if_stmt);
6233 static_aggregates = tree_cons (init, decl, static_aggregates);
6237 /* Make TYPE a complete type based on INITIAL_VALUE.
6238 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
6239 2 if there was no information (in which case assume 0 if DO_DEFAULT),
6240 3 if the initializer list is empty (in pedantic mode). */
6243 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
6246 tree type, elt_type;
6250 unsigned HOST_WIDE_INT i;
6253 /* An array of character type can be initialized from a
6254 brace-enclosed string constant.
6256 FIXME: this code is duplicated from reshape_init. Probably
6257 we should just call reshape_init here? */
6258 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
6259 && TREE_CODE (initial_value) == CONSTRUCTOR
6260 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
6262 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
6263 tree value = VEC_index (constructor_elt, v, 0)->value;
6265 if (TREE_CODE (value) == STRING_CST
6266 && VEC_length (constructor_elt, v) == 1)
6267 initial_value = value;
6270 /* If any of the elements are parameter packs, we can't actually
6271 complete this type now because the array size is dependent. */
6272 if (TREE_CODE (initial_value) == CONSTRUCTOR)
6274 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value),
6277 if (PACK_EXPANSION_P (value))
6283 failure = complete_array_type (ptype, initial_value, do_default);
6285 /* We can create the array before the element type is complete, which
6286 means that we didn't have these two bits set in the original type
6287 either. In completing the type, we are expected to propagate these
6288 bits. See also complete_type which does the same thing for arrays
6291 if (TYPE_DOMAIN (type))
6293 elt_type = TREE_TYPE (type);
6294 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
6295 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
6296 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
6302 /* Return zero if something is declared to be a member of type
6303 CTYPE when in the context of CUR_TYPE. STRING is the error
6304 message to print in that case. Otherwise, quietly return 1. */
6307 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
6309 if (ctype && ctype != cur_type)
6311 if (flags == DTOR_FLAG)
6312 error ("destructor for alien class %qT cannot be a member", ctype);
6314 error ("constructor for alien class %qT cannot be a member", ctype);
6320 /* Subroutine of `grokdeclarator'. */
6322 /* Generate errors possibly applicable for a given set of specifiers.
6323 This is for ARM $7.1.2. */
6326 bad_specifiers (tree object,
6335 error ("%qD declared as a %<virtual%> %s", object, type);
6337 error ("%qD declared as an %<inline%> %s", object, type);
6339 error ("%<const%> and %<volatile%> function specifiers on "
6340 "%qD invalid in %s declaration",
6343 error ("%q+D declared as a friend", object);
6345 && (TREE_CODE (object) == TYPE_DECL
6346 || (!TYPE_PTRFN_P (TREE_TYPE (object))
6347 && !TYPE_REFFN_P (TREE_TYPE (object))
6348 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
6349 error ("%q+D declared with an exception specification", object);
6352 /* DECL is a member function or static data member and is presently
6353 being defined. Check that the definition is taking place in a
6357 check_class_member_definition_namespace (tree decl)
6359 /* These checks only apply to member functions and static data
6361 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
6362 || TREE_CODE (decl) == VAR_DECL);
6363 /* We check for problems with specializations in pt.c in
6364 check_specialization_namespace, where we can issue better
6366 if (processing_specialization)
6368 /* There are no restrictions on the placement of
6369 explicit instantiations. */
6370 if (processing_explicit_instantiation)
6374 A member function definition that appears outside of the
6375 class definition shall appear in a namespace scope enclosing
6376 the class definition.
6380 The definition for a static data member shall appear in a
6381 namespace scope enclosing the member's class definition. */
6382 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
6383 permerror (input_location, "definition of %qD is not in namespace enclosing %qT",
6384 decl, DECL_CONTEXT (decl));
6387 /* Build a PARM_DECL for the "this" parameter. TYPE is the
6388 METHOD_TYPE for a non-static member function; QUALS are the
6389 cv-qualifiers that apply to the function. */
6392 build_this_parm (tree type, cp_cv_quals quals)
6397 cp_cv_quals this_quals;
6399 this_type = TREE_VALUE (TYPE_ARG_TYPES (type));
6400 /* The `this' parameter is implicitly `const'; it cannot be
6402 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
6403 qual_type = cp_build_qualified_type (this_type, this_quals);
6404 parm = build_artificial_parm (this_identifier, qual_type);
6405 cp_apply_type_quals_to_decl (this_quals, parm);
6409 /* CTYPE is class type, or null if non-class.
6410 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
6412 DECLARATOR is the function's name.
6413 PARMS is a chain of PARM_DECLs for the function.
6414 VIRTUALP is truthvalue of whether the function is virtual or not.
6415 FLAGS are to be passed through to `grokclassfn'.
6416 QUALS are qualifiers indicating whether the function is `const'
6418 RAISES is a list of exceptions that this function can raise.
6419 CHECK is 1 if we must find this method in CTYPE, 0 if we should
6420 not look, and -1 if we should not call `grokclassfn' at all.
6422 SFK is the kind of special function (if any) for the new function.
6424 Returns `NULL_TREE' if something goes wrong, after issuing
6425 applicable error messages. */
6428 grokfndecl (tree ctype,
6432 tree orig_declarator,
6434 enum overload_flags flags,
6441 special_function_kind sfk,
6448 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
6452 type = build_exception_variant (type, raises);
6454 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
6455 if (TREE_CODE (type) == METHOD_TYPE)
6458 parm = build_this_parm (type, quals);
6459 TREE_CHAIN (parm) = parms;
6462 DECL_ARGUMENTS (decl) = parms;
6463 /* Propagate volatile out from type to decl. */
6464 if (TYPE_VOLATILE (type))
6465 TREE_THIS_VOLATILE (decl) = 1;
6467 /* Setup decl according to sfk. */
6470 case sfk_constructor:
6471 case sfk_copy_constructor:
6472 DECL_CONSTRUCTOR_P (decl) = 1;
6474 case sfk_destructor:
6475 DECL_DESTRUCTOR_P (decl) = 1;
6481 /* If pointers to member functions use the least significant bit to
6482 indicate whether a function is virtual, ensure a pointer
6483 to this function will have that bit clear. */
6484 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
6485 && TREE_CODE (type) == METHOD_TYPE
6486 && DECL_ALIGN (decl) < 2 * BITS_PER_UNIT)
6487 DECL_ALIGN (decl) = 2 * BITS_PER_UNIT;
6490 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
6494 ("defining explicit specialization %qD in friend declaration",
6498 tree fns = TREE_OPERAND (orig_declarator, 0);
6499 tree args = TREE_OPERAND (orig_declarator, 1);
6501 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
6503 /* Something like `template <class T> friend void f<T>()'. */
6504 error ("invalid use of template-id %qD in declaration "
6505 "of primary template",
6511 /* A friend declaration of the form friend void f<>(). Record
6512 the information in the TEMPLATE_ID_EXPR. */
6513 SET_DECL_IMPLICIT_INSTANTIATION (decl);
6515 if (TREE_CODE (fns) == COMPONENT_REF)
6517 /* Due to bison parser ickiness, we will have already looked
6518 up an operator_name or PFUNCNAME within the current class
6519 (see template_id in parse.y). If the current class contains
6520 such a name, we'll get a COMPONENT_REF here. Undo that. */
6522 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
6523 == current_class_type);
6524 fns = TREE_OPERAND (fns, 1);
6526 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
6527 || TREE_CODE (fns) == OVERLOAD);
6528 DECL_TEMPLATE_INFO (decl) = tree_cons (fns, args, NULL_TREE);
6530 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
6531 if (TREE_PURPOSE (t)
6532 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
6534 error ("default arguments are not allowed in declaration "
6535 "of friend template specialization %qD",
6542 error ("%<inline%> is not allowed in declaration of friend "
6543 "template specialization %qD",
6550 /* If this decl has namespace scope, set that up. */
6552 set_decl_namespace (decl, in_namespace, friendp);
6554 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
6556 /* `main' and builtins have implicit 'C' linkage. */
6557 if ((MAIN_NAME_P (declarator)
6558 || (IDENTIFIER_LENGTH (declarator) > 10
6559 && IDENTIFIER_POINTER (declarator)[0] == '_'
6560 && IDENTIFIER_POINTER (declarator)[1] == '_'
6561 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
6562 && current_lang_name == lang_name_cplusplus
6563 && ctype == NULL_TREE
6564 /* NULL_TREE means global namespace. */
6565 && DECL_CONTEXT (decl) == NULL_TREE)
6566 SET_DECL_LANGUAGE (decl, lang_c);
6568 /* Should probably propagate const out from type to decl I bet (mrs). */
6571 DECL_STATIC_FUNCTION_P (decl) = 1;
6572 DECL_CONTEXT (decl) = ctype;
6577 DECL_CONTEXT (decl) = ctype;
6579 check_class_member_definition_namespace (decl);
6582 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
6584 if (processing_template_decl)
6585 error ("cannot declare %<::main%> to be a template");
6587 error ("cannot declare %<::main%> to be inline");
6589 error ("cannot declare %<::main%> to be static");
6594 /* Members of anonymous types and local classes have no linkage; make
6595 them internal. If a typedef is made later, this will be changed. */
6596 if (ctype && (TYPE_ANONYMOUS_P (ctype)
6597 || decl_function_context (TYPE_MAIN_DECL (ctype))))
6602 /* [basic.link]: A name with no linkage (notably, the name of a class
6603 or enumeration declared in a local scope) shall not be used to
6604 declare an entity with linkage.
6606 Only check this for public decls for now. See core 319, 389. */
6607 t = no_linkage_check (TREE_TYPE (decl),
6608 /*relaxed_p=*/false);
6611 if (TYPE_ANONYMOUS_P (t))
6613 if (DECL_EXTERN_C_P (decl))
6614 /* Allow this; it's pretty common in C. */;
6617 permerror (input_location, "non-local function %q#D uses anonymous type",
6619 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
6620 permerror (input_location, "%q+#D does not refer to the unqualified "
6621 "type, so it is not used for linkage",
6626 permerror (input_location, "non-local function %q#D uses local type %qT", decl, t);
6630 TREE_PUBLIC (decl) = publicp;
6633 DECL_INTERFACE_KNOWN (decl) = 1;
6634 DECL_NOT_REALLY_EXTERN (decl) = 1;
6637 /* If the declaration was declared inline, mark it as such. */
6639 DECL_DECLARED_INLINE_P (decl) = 1;
6641 DECL_EXTERNAL (decl) = 1;
6642 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
6645 ? G_("static member function %qD cannot have cv-qualifier")
6646 : G_("non-member function %qD cannot have cv-qualifier"),
6648 quals = TYPE_UNQUALIFIED;
6651 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
6652 && !grok_op_properties (decl, /*complain=*/true))
6655 if (ctype && decl_function_context (decl))
6656 DECL_NO_STATIC_CHAIN (decl) = 1;
6659 /* Make the init_value nonzero so pushdecl knows this is not
6660 tentative. error_mark_node is replaced later with the BLOCK. */
6661 DECL_INITIAL (decl) = error_mark_node;
6663 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
6664 TREE_NOTHROW (decl) = 1;
6666 /* Caller will do the rest of this. */
6670 if (ctype != NULL_TREE)
6671 grokclassfn (ctype, decl, flags);
6673 decl = check_explicit_specialization (orig_declarator, decl,
6676 4 * (friendp != 0));
6677 if (decl == error_mark_node)
6682 cplus_decl_attributes (&decl, *attrlist, 0);
6683 *attrlist = NULL_TREE;
6686 /* Check main's type after attributes have been applied. */
6687 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
6689 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
6692 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
6694 error ("%<::main%> must return %<int%>");
6695 newtype = build_function_type (integer_type_node, oldtypeargs);
6696 TREE_TYPE (decl) = newtype;
6699 check_main_parameter_types (decl);
6702 if (ctype != NULL_TREE
6703 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
6706 tree old_decl = check_classfn (ctype, decl,
6707 (processing_template_decl
6708 > template_class_depth (ctype))
6709 ? current_template_parms
6712 if (old_decl == error_mark_node)
6720 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
6721 /* Because grokfndecl is always supposed to return a
6722 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
6723 here. We depend on our callers to figure out that its
6724 really a template that's being returned. */
6725 old_decl = DECL_TEMPLATE_RESULT (old_decl);
6727 if (DECL_STATIC_FUNCTION_P (old_decl)
6728 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
6729 /* Remove the `this' parm added by grokclassfn.
6730 XXX Isn't this done in start_function, too? */
6731 revert_static_member_fn (decl);
6732 if (DECL_ARTIFICIAL (old_decl))
6734 error ("definition of implicitly-declared %qD", old_decl);
6738 /* Since we've smashed OLD_DECL to its
6739 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
6740 if (TREE_CODE (decl) == TEMPLATE_DECL)
6741 decl = DECL_TEMPLATE_RESULT (decl);
6743 /* Attempt to merge the declarations. This can fail, in
6744 the case of some invalid specialization declarations. */
6745 pushed_scope = push_scope (ctype);
6746 ok = duplicate_decls (decl, old_decl, friendp);
6748 pop_scope (pushed_scope);
6751 error ("no %q#D member function declared in class %qT",
6759 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
6762 if (ctype == NULL_TREE || check)
6766 DECL_VIRTUAL_P (decl) = 1;
6771 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
6772 the linkage that DECL will receive in the object file. */
6775 set_linkage_for_static_data_member (tree decl)
6777 /* A static data member always has static storage duration and
6778 external linkage. Note that static data members are forbidden in
6779 local classes -- the only situation in which a class has
6780 non-external linkage. */
6781 TREE_PUBLIC (decl) = 1;
6782 TREE_STATIC (decl) = 1;
6783 /* For non-template classes, static data members are always put
6784 out in exactly those files where they are defined, just as
6785 with ordinary namespace-scope variables. */
6786 if (!processing_template_decl)
6787 DECL_INTERFACE_KNOWN (decl) = 1;
6790 /* Create a VAR_DECL named NAME with the indicated TYPE.
6792 If SCOPE is non-NULL, it is the class type or namespace containing
6793 the variable. If SCOPE is NULL, the variable should is created in
6794 the innermost enclosings scope. */
6797 grokvardecl (tree type,
6799 const cp_decl_specifier_seq *declspecs,
6805 tree explicit_scope;
6807 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
6809 /* Compute the scope in which to place the variable, but remember
6810 whether or not that scope was explicitly specified by the user. */
6811 explicit_scope = scope;
6814 /* An explicit "extern" specifier indicates a namespace-scope
6816 if (declspecs->storage_class == sc_extern)
6817 scope = current_namespace;
6818 else if (!at_function_scope_p ())
6819 scope = current_scope ();
6823 && (/* If the variable is a namespace-scope variable declared in a
6824 template, we need DECL_LANG_SPECIFIC. */
6825 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
6826 /* Similarly for namespace-scope variables with language linkage
6828 || (TREE_CODE (scope) == NAMESPACE_DECL
6829 && current_lang_name != lang_name_cplusplus)
6830 /* Similarly for static data members. */
6832 decl = build_lang_decl (VAR_DECL, name, type);
6834 decl = build_decl (VAR_DECL, name, type);
6836 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
6837 set_decl_namespace (decl, explicit_scope, 0);
6839 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
6841 if (declspecs->storage_class == sc_extern)
6843 DECL_THIS_EXTERN (decl) = 1;
6844 DECL_EXTERNAL (decl) = !initialized;
6847 if (DECL_CLASS_SCOPE_P (decl))
6849 set_linkage_for_static_data_member (decl);
6850 /* This function is only called with out-of-class definitions. */
6851 DECL_EXTERNAL (decl) = 0;
6852 check_class_member_definition_namespace (decl);
6854 /* At top level, either `static' or no s.c. makes a definition
6855 (perhaps tentative), and absence of `static' makes it public. */
6856 else if (toplevel_bindings_p ())
6858 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
6859 && (DECL_THIS_EXTERN (decl) || ! constp));
6860 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
6862 /* Not at top level, only `static' makes a static definition. */
6865 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
6866 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
6869 if (declspecs->specs[(int)ds_thread])
6870 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
6872 if (TREE_PUBLIC (decl))
6874 /* [basic.link]: A name with no linkage (notably, the name of a class
6875 or enumeration declared in a local scope) shall not be used to
6876 declare an entity with linkage.
6878 Only check this for public decls for now. */
6879 tree t = no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false);
6882 if (TYPE_ANONYMOUS_P (t))
6884 if (DECL_EXTERN_C_P (decl))
6885 /* Allow this; it's pretty common in C. */
6889 /* DRs 132, 319 and 389 seem to indicate types with
6890 no linkage can only be used to declare extern "C"
6891 entities. Since it's not always an error in the
6892 ISO C++ 90 Standard, we only issue a warning. */
6893 warning (0, "non-local variable %q#D uses anonymous type",
6895 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
6896 warning (0, "%q+#D does not refer to the unqualified "
6897 "type, so it is not used for linkage",
6902 warning (0, "non-local variable %q#D uses local type %qT", decl, t);
6906 DECL_INTERFACE_KNOWN (decl) = 1;
6911 /* Create and return a canonical pointer to member function type, for
6912 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
6915 build_ptrmemfunc_type (tree type)
6919 tree unqualified_variant = NULL_TREE;
6921 if (type == error_mark_node)
6924 /* If a canonical type already exists for this type, use it. We use
6925 this method instead of type_hash_canon, because it only does a
6926 simple equality check on the list of field members. */
6928 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
6931 /* Make sure that we always have the unqualified pointer-to-member
6933 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
6935 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
6937 t = make_class_type (RECORD_TYPE);
6938 xref_basetypes (t, NULL_TREE);
6940 /* Let the front end know this is a pointer to member function... */
6941 TYPE_PTRMEMFUNC_FLAG (t) = 1;
6942 /* ... and not really a class type. */
6943 SET_CLASS_TYPE_P (t, 0);
6945 field = build_decl (FIELD_DECL, pfn_identifier, type);
6948 field = build_decl (FIELD_DECL, delta_identifier, delta_type_node);
6949 TREE_CHAIN (field) = fields;
6952 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
6954 /* Zap out the name so that the back end will give us the debugging
6955 information for this anonymous RECORD_TYPE. */
6956 TYPE_NAME (t) = NULL_TREE;
6958 /* If this is not the unqualified form of this pointer-to-member
6959 type, set the TYPE_MAIN_VARIANT for this type to be the
6960 unqualified type. Since they are actually RECORD_TYPEs that are
6961 not variants of each other, we must do this manually. */
6962 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
6964 t = build_qualified_type (t, cp_type_quals (type));
6965 TYPE_MAIN_VARIANT (t) = unqualified_variant;
6966 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
6967 TYPE_NEXT_VARIANT (unqualified_variant) = t;
6968 TREE_TYPE (TYPE_BINFO (t)) = t;
6971 /* Cache this pointer-to-member type so that we can find it again
6973 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
6975 if (TYPE_STRUCTURAL_EQUALITY_P (type))
6976 SET_TYPE_STRUCTURAL_EQUALITY (t);
6977 else if (TYPE_CANONICAL (type) != type)
6978 TYPE_CANONICAL (t) = build_ptrmemfunc_type (TYPE_CANONICAL (type));
6983 /* Create and return a pointer to data member type. */
6986 build_ptrmem_type (tree class_type, tree member_type)
6988 if (TREE_CODE (member_type) == METHOD_TYPE)
6992 arg_types = TYPE_ARG_TYPES (member_type);
6993 class_type = (cp_build_qualified_type
6995 cp_type_quals (TREE_TYPE (TREE_VALUE (arg_types)))));
6997 = build_method_type_directly (class_type,
6998 TREE_TYPE (member_type),
6999 TREE_CHAIN (arg_types));
7000 return build_ptrmemfunc_type (build_pointer_type (member_type));
7004 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
7005 return build_offset_type (class_type, member_type);
7009 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
7010 Check to see that the definition is valid. Issue appropriate error
7011 messages. Return 1 if the definition is particularly bad, or 0
7015 check_static_variable_definition (tree decl, tree type)
7017 /* Motion 10 at San Diego: If a static const integral data member is
7018 initialized with an integral constant expression, the initializer
7019 may appear either in the declaration (within the class), or in
7020 the definition, but not both. If it appears in the class, the
7021 member is a member constant. The file-scope definition is always
7023 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
7025 error ("invalid in-class initialization of static data member "
7026 "of non-integral type %qT",
7028 /* If we just return the declaration, crashes will sometimes
7029 occur. We therefore return void_type_node, as if this were a
7030 friend declaration, to cause callers to completely ignore
7031 this declaration. */
7034 else if (!CP_TYPE_CONST_P (type))
7035 error ("ISO C++ forbids in-class initialization of non-const "
7036 "static member %qD",
7038 else if (!INTEGRAL_TYPE_P (type))
7039 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids initialization of member constant "
7040 "%qD of non-integral type %qT", decl, type);
7045 /* Given the SIZE (i.e., number of elements) in an array, compute an
7046 appropriate index type for the array. If non-NULL, NAME is the
7047 name of the thing being declared. */
7050 compute_array_index_type (tree name, tree size)
7054 tree abi_1_itype = NULL_TREE;
7056 if (error_operand_p (size))
7057 return error_mark_node;
7059 type = TREE_TYPE (size);
7060 /* The array bound must be an integer type. */
7061 if (!dependent_type_p (type) && !INTEGRAL_TYPE_P (type))
7064 error ("size of array %qD has non-integral type %qT", name, type);
7066 error ("size of array has non-integral type %qT", type);
7067 size = integer_one_node;
7068 type = TREE_TYPE (size);
7071 if (value_dependent_expression_p (size))
7073 /* We cannot do any checking for a value-dependent SIZE. Just
7074 build the index type and mark that it requires structural
7076 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7077 size, integer_one_node));
7078 SET_TYPE_STRUCTURAL_EQUALITY (itype);
7082 if (!abi_version_at_least (2) && processing_template_decl)
7083 /* For abi-1, we handled all instances in templates the same way,
7084 even when they were non-dependent. This affects the manglings
7085 produced. So, we do the normal checking for non-dependent
7086 sizes, but at the end we'll return the same type that abi-1
7087 would have, but with TYPE_CANONICAL set to the "right"
7088 value that the current ABI would provide. */
7089 abi_1_itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7090 size, integer_one_node));
7092 /* The size might be the result of a cast. */
7093 STRIP_TYPE_NOPS (size);
7095 /* It might be a const variable or enumeration constant. */
7096 size = integral_constant_value (size);
7098 /* Normally, the array-bound will be a constant. */
7099 if (TREE_CODE (size) == INTEGER_CST)
7101 /* Check to see if the array bound overflowed. Make that an
7102 error, no matter how generous we're being. */
7103 constant_expression_error (size);
7105 /* An array must have a positive number of elements. */
7106 if (INT_CST_LT (size, integer_zero_node))
7109 error ("size of array %qD is negative", name);
7111 error ("size of array is negative");
7112 size = integer_one_node;
7114 /* As an extension we allow zero-sized arrays. We always allow
7115 them in system headers because glibc uses them. */
7116 else if (integer_zerop (size) && !in_system_header)
7119 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array %qD", name);
7121 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array");
7124 else if (TREE_CONSTANT (size))
7126 /* `(int) &fn' is not a valid array bound. */
7128 error ("size of array %qD is not an integral constant-expression",
7131 error ("size of array is not an integral constant-expression");
7132 size = integer_one_node;
7134 else if (pedantic && warn_vla != 0)
7137 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array %qD", name);
7139 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array");
7141 else if (warn_vla > 0)
7145 "variable length array %qD is used", name);
7148 "variable length array is used");
7151 if (processing_template_decl && !TREE_CONSTANT (size))
7152 /* A variable sized array. */
7153 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
7156 HOST_WIDE_INT saved_processing_template_decl;
7158 /* Compute the index of the largest element in the array. It is
7159 one less than the number of elements in the array. We save
7160 and restore PROCESSING_TEMPLATE_DECL so that computations in
7161 cp_build_binary_op will be appropriately folded. */
7162 saved_processing_template_decl = processing_template_decl;
7163 processing_template_decl = 0;
7164 itype = cp_build_binary_op (MINUS_EXPR,
7165 cp_convert (ssizetype, size),
7166 cp_convert (ssizetype, integer_one_node),
7167 tf_warning_or_error);
7168 itype = fold (itype);
7169 processing_template_decl = saved_processing_template_decl;
7171 if (!TREE_CONSTANT (itype))
7172 /* A variable sized array. */
7173 itype = variable_size (itype);
7174 /* Make sure that there was no overflow when creating to a signed
7175 index type. (For example, on a 32-bit machine, an array with
7176 size 2^32 - 1 is too big.) */
7177 else if (TREE_CODE (itype) == INTEGER_CST
7178 && TREE_OVERFLOW (itype))
7180 error ("overflow in array dimension");
7181 TREE_OVERFLOW (itype) = 0;
7185 /* Create and return the appropriate index type. */
7188 tree t = build_index_type (itype);
7189 TYPE_CANONICAL (abi_1_itype) = TYPE_CANONICAL (t);
7193 return build_index_type (itype);
7196 /* Returns the scope (if any) in which the entity declared by
7197 DECLARATOR will be located. If the entity was declared with an
7198 unqualified name, NULL_TREE is returned. */
7201 get_scope_of_declarator (const cp_declarator *declarator)
7203 while (declarator && declarator->kind != cdk_id)
7204 declarator = declarator->declarator;
7206 /* If the declarator-id is a SCOPE_REF, the scope in which the
7207 declaration occurs is the first operand. */
7209 && declarator->u.id.qualifying_scope)
7210 return declarator->u.id.qualifying_scope;
7212 /* Otherwise, the declarator is not a qualified name; the entity will
7213 be declared in the current scope. */
7217 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
7218 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
7222 create_array_type_for_decl (tree name, tree type, tree size)
7224 tree itype = NULL_TREE;
7225 const char* error_msg;
7227 /* If things have already gone awry, bail now. */
7228 if (type == error_mark_node || size == error_mark_node)
7229 return error_mark_node;
7231 /* Assume that everything will go OK. */
7234 /* There are some types which cannot be array elements. */
7235 switch (TREE_CODE (type))
7238 error_msg = "array of void";
7242 error_msg = "array of functions";
7245 case REFERENCE_TYPE:
7246 error_msg = "array of references";
7250 error_msg = "array of function members";
7257 /* If something went wrong, issue an error-message and return. */
7261 error ("declaration of %qD as %s", name, error_msg);
7263 error ("creating %s", error_msg);
7265 return error_mark_node;
7270 The constant expressions that specify the bounds of the arrays
7271 can be omitted only for the first member of the sequence. */
7272 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
7275 error ("declaration of %qD as multidimensional array must "
7276 "have bounds for all dimensions except the first",
7279 error ("multidimensional array must have bounds for all "
7280 "dimensions except the first");
7282 return error_mark_node;
7285 /* Figure out the index type for the array. */
7287 itype = compute_array_index_type (name, size);
7290 T is called the array element type; this type shall not be [...] an
7291 abstract class type. */
7292 abstract_virtuals_error (name, type);
7294 return build_cplus_array_type (type, itype);
7297 /* Check that it's OK to declare a function with the indicated TYPE.
7298 SFK indicates the kind of special function (if any) that this
7299 function is. OPTYPE is the type given in a conversion operator
7300 declaration, or the class type for a constructor/destructor.
7301 Returns the actual return type of the function; that
7302 may be different than TYPE if an error occurs, or for certain
7303 special functions. */
7306 check_special_function_return_type (special_function_kind sfk,
7312 case sfk_constructor:
7314 error ("return type specification for constructor invalid");
7316 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7317 type = build_pointer_type (optype);
7319 type = void_type_node;
7322 case sfk_destructor:
7324 error ("return type specification for destructor invalid");
7325 /* We can't use the proper return type here because we run into
7326 problems with ambiguous bases and covariant returns.
7327 Java classes are left unchanged because (void *) isn't a valid
7328 Java type, and we don't want to change the Java ABI. */
7329 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7330 type = build_pointer_type (void_type_node);
7332 type = void_type_node;
7335 case sfk_conversion:
7337 error ("return type specified for %<operator %T%>", optype);
7348 /* A variable or data member (whose unqualified name is IDENTIFIER)
7349 has been declared with the indicated TYPE. If the TYPE is not
7350 acceptable, issue an error message and return a type to use for
7351 error-recovery purposes. */
7354 check_var_type (tree identifier, tree type)
7356 if (VOID_TYPE_P (type))
7359 error ("unnamed variable or field declared void");
7360 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
7362 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
7363 error ("variable or field %qE declared void", identifier);
7366 error ("variable or field declared void");
7367 type = error_mark_node;
7373 /* Given declspecs and a declarator (abstract or otherwise), determine
7374 the name and type of the object declared and construct a DECL node
7377 DECLSPECS points to the representation of declaration-specifier
7378 sequence that precedes declarator.
7380 DECL_CONTEXT says which syntactic context this declaration is in:
7381 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
7382 FUNCDEF for a function definition. Like NORMAL but a few different
7383 error messages in each case. Return value may be zero meaning
7384 this definition is too screwy to try to parse.
7385 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
7386 handle member functions (which have FIELD context).
7387 Return value may be zero meaning this definition is too screwy to
7389 PARM for a parameter declaration (either within a function prototype
7390 or before a function body). Make a PARM_DECL, or return void_type_node.
7391 CATCHPARM for a parameter declaration before a catch clause.
7392 TYPENAME if for a typename (in a cast or sizeof).
7393 Don't make a DECL node; just return the ..._TYPE node.
7394 FIELD for a struct or union field; make a FIELD_DECL.
7395 BITFIELD for a field with specified width.
7396 INITIALIZED is as for start_decl.
7398 ATTRLIST is a pointer to the list of attributes, which may be NULL
7399 if there are none; *ATTRLIST may be modified if attributes from inside
7400 the declarator should be applied to the declaration.
7402 When this function is called, scoping variables (such as
7403 CURRENT_CLASS_TYPE) should reflect the scope in which the
7404 declaration occurs, not the scope in which the new declaration will
7405 be placed. For example, on:
7409 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
7412 Returns a DECL (if a declarator is present), a TYPE (if there is no
7413 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
7417 grokdeclarator (const cp_declarator *declarator,
7418 const cp_decl_specifier_seq *declspecs,
7419 enum decl_context decl_context,
7423 tree type = NULL_TREE;
7425 int virtualp, explicitp, friendp, inlinep, staticp;
7426 int explicit_int = 0;
7427 int explicit_char = 0;
7428 int defaulted_int = 0;
7429 tree dependent_name = NULL_TREE;
7431 tree typedef_decl = NULL_TREE;
7432 const char *name = NULL;
7433 tree typedef_type = NULL_TREE;
7434 /* True if this declarator is a function definition. */
7435 bool funcdef_flag = false;
7436 cp_declarator_kind innermost_code = cdk_error;
7439 /* See the code below that used this. */
7440 tree decl_attr = NULL_TREE;
7443 /* Keep track of what sort of function is being processed
7444 so that we can warn about default return values, or explicit
7445 return values which do not match prescribed defaults. */
7446 special_function_kind sfk = sfk_none;
7448 tree dname = NULL_TREE;
7449 tree ctor_return_type = NULL_TREE;
7450 enum overload_flags flags = NO_SPECIAL;
7451 /* cv-qualifiers that apply to the declarator, for a declaration of
7452 a member function. */
7453 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
7454 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
7456 tree raises = NULL_TREE;
7457 int template_count = 0;
7458 tree returned_attrs = NULL_TREE;
7459 tree parms = NULL_TREE;
7460 const cp_declarator *id_declarator;
7461 /* The unqualified name of the declarator; either an
7462 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
7463 tree unqualified_id;
7464 /* The class type, if any, in which this entity is located,
7465 or NULL_TREE if none. Note that this value may be different from
7466 the current class type; for example if an attempt is made to declare
7467 "A::f" inside "B", this value will be "A". */
7468 tree ctype = current_class_type;
7469 /* The NAMESPACE_DECL for the namespace in which this entity is
7470 located. If an unqualified name is used to declare the entity,
7471 this value will be NULL_TREE, even if the entity is located at
7473 tree in_namespace = NULL_TREE;
7474 cp_storage_class storage_class;
7475 bool unsigned_p, signed_p, short_p, long_p, thread_p;
7476 bool type_was_error_mark_node = false;
7477 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
7478 bool set_no_warning = false;
7480 signed_p = declspecs->specs[(int)ds_signed];
7481 unsigned_p = declspecs->specs[(int)ds_unsigned];
7482 short_p = declspecs->specs[(int)ds_short];
7483 long_p = declspecs->specs[(int)ds_long];
7484 longlong = declspecs->specs[(int)ds_long] >= 2;
7485 thread_p = declspecs->specs[(int)ds_thread];
7487 if (decl_context == FUNCDEF)
7488 funcdef_flag = true, decl_context = NORMAL;
7489 else if (decl_context == MEMFUNCDEF)
7490 funcdef_flag = true, decl_context = FIELD;
7491 else if (decl_context == BITFIELD)
7492 bitfield = 1, decl_context = FIELD;
7494 if (initialized > 1)
7495 funcdef_flag = true;
7497 /* Look inside a declarator for the name being declared
7498 and get it as a string, for an error message. */
7499 for (id_declarator = declarator;
7501 id_declarator = id_declarator->declarator)
7503 if (id_declarator->kind != cdk_id)
7504 innermost_code = id_declarator->kind;
7506 switch (id_declarator->kind)
7509 if (id_declarator->declarator
7510 && id_declarator->declarator->kind == cdk_id)
7512 sfk = id_declarator->declarator->u.id.sfk;
7513 if (sfk == sfk_destructor)
7520 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
7521 tree decl = id_declarator->u.id.unqualified_name;
7524 if (qualifying_scope)
7526 if (at_function_scope_p ())
7530 A declarator-id shall not be qualified except
7533 None of the cases are permitted in block
7535 if (qualifying_scope == global_namespace)
7536 error ("invalid use of qualified-name %<::%D%>",
7538 else if (TYPE_P (qualifying_scope))
7539 error ("invalid use of qualified-name %<%T::%D%>",
7540 qualifying_scope, decl);
7542 error ("invalid use of qualified-name %<%D::%D%>",
7543 qualifying_scope, decl);
7544 return error_mark_node;
7546 else if (TYPE_P (qualifying_scope))
7548 ctype = qualifying_scope;
7549 if (innermost_code != cdk_function
7550 && current_class_type
7551 && !UNIQUELY_DERIVED_FROM_P (ctype,
7552 current_class_type))
7554 error ("type %qT is not derived from type %qT",
7555 ctype, current_class_type);
7556 return error_mark_node;
7559 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
7560 in_namespace = qualifying_scope;
7562 switch (TREE_CODE (decl))
7568 if (innermost_code != cdk_function)
7570 error ("declaration of %qD as non-function", decl);
7571 return error_mark_node;
7573 else if (!qualifying_scope
7574 && !(current_class_type && at_class_scope_p ()))
7576 error ("declaration of %qD as non-member", decl);
7577 return error_mark_node;
7580 type = TREE_OPERAND (decl, 0);
7581 name = IDENTIFIER_POINTER (constructor_name (type));
7586 case TEMPLATE_ID_EXPR:
7588 tree fns = TREE_OPERAND (decl, 0);
7591 if (TREE_CODE (dname) != IDENTIFIER_NODE)
7593 gcc_assert (is_overloaded_fn (dname));
7594 dname = DECL_NAME (get_first_fn (dname));
7599 case IDENTIFIER_NODE:
7600 if (TREE_CODE (decl) == IDENTIFIER_NODE)
7603 if (C_IS_RESERVED_WORD (dname))
7605 error ("declarator-id missing; using reserved word %qD",
7607 name = IDENTIFIER_POINTER (dname);
7609 else if (!IDENTIFIER_TYPENAME_P (dname))
7610 name = IDENTIFIER_POINTER (dname);
7613 gcc_assert (flags == NO_SPECIAL);
7614 flags = TYPENAME_FLAG;
7615 ctor_return_type = TREE_TYPE (dname);
7616 sfk = sfk_conversion;
7617 if (is_typename_at_global_scope (dname))
7618 name = IDENTIFIER_POINTER (dname);
7620 name = "<invalid operator>";
7637 return error_mark_node;
7642 if (id_declarator->kind == cdk_id)
7648 The declarator in a function-definition shall have the form
7649 D1 ( parameter-declaration-clause) ... */
7650 if (funcdef_flag && innermost_code != cdk_function)
7652 error ("function definition does not declare parameters");
7653 return error_mark_node;
7656 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
7657 && innermost_code != cdk_function
7658 && ! (ctype && !declspecs->any_specifiers_p))
7660 error ("declaration of %qD as non-function", dname);
7661 return error_mark_node;
7664 /* Anything declared one level down from the top level
7665 must be one of the parameters of a function
7666 (because the body is at least two levels down). */
7668 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
7669 by not allowing C++ class definitions to specify their parameters
7670 with xdecls (must be spec.d in the parmlist).
7672 Since we now wait to push a class scope until we are sure that
7673 we are in a legitimate method context, we must set oldcname
7674 explicitly (since current_class_name is not yet alive).
7676 We also want to avoid calling this a PARM if it is in a namespace. */
7678 if (decl_context == NORMAL && !toplevel_bindings_p ())
7680 struct cp_binding_level *b = current_binding_level;
7681 current_binding_level = b->level_chain;
7682 if (current_binding_level != 0 && toplevel_bindings_p ())
7683 decl_context = PARM;
7684 current_binding_level = b;
7688 name = decl_context == PARM ? "parameter" : "type name";
7690 /* If there were multiple types specified in the decl-specifier-seq,
7691 issue an error message. */
7692 if (declspecs->multiple_types_p)
7694 error ("two or more data types in declaration of %qs", name);
7695 return error_mark_node;
7698 if (declspecs->conflicting_specifiers_p)
7700 error ("conflicting specifiers in declaration of %qs", name);
7701 return error_mark_node;
7704 /* Extract the basic type from the decl-specifier-seq. */
7705 type = declspecs->type;
7706 if (type == error_mark_node)
7709 type_was_error_mark_node = true;
7711 /* If the entire declaration is itself tagged as deprecated then
7712 suppress reports of deprecated items. */
7713 if (type && TREE_DEPRECATED (type)
7714 && deprecated_state != DEPRECATED_SUPPRESS)
7715 warn_deprecated_use (type);
7716 if (type && TREE_CODE (type) == TYPE_DECL)
7718 typedef_decl = type;
7719 type = TREE_TYPE (typedef_decl);
7720 if (TREE_DEPRECATED (type)
7721 && DECL_ARTIFICIAL (typedef_decl)
7722 && deprecated_state != DEPRECATED_SUPPRESS)
7723 warn_deprecated_use (type);
7725 /* No type at all: default to `int', and set DEFAULTED_INT
7726 because it was not a user-defined typedef. */
7727 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
7729 /* These imply 'int'. */
7730 type = integer_type_node;
7734 explicit_int = declspecs->explicit_int_p;
7735 explicit_char = declspecs->explicit_char_p;
7738 /* See the code below that used this. */
7740 decl_attr = DECL_ATTRIBUTES (typedef_decl);
7742 typedef_type = type;
7745 if (sfk != sfk_conversion)
7746 ctor_return_type = ctype;
7748 if (sfk != sfk_none)
7749 type = check_special_function_return_type (sfk, type,
7751 else if (type == NULL_TREE)
7757 /* We handle `main' specially here, because 'main () { }' is so
7758 common. With no options, it is allowed. With -Wreturn-type,
7759 it is a warning. It is only an error with -pedantic-errors. */
7760 is_main = (funcdef_flag
7761 && dname && MAIN_NAME_P (dname)
7762 && ctype == NULL_TREE
7763 && in_namespace == NULL_TREE
7764 && current_namespace == global_namespace);
7766 if (type_was_error_mark_node)
7767 /* We've already issued an error, don't complain more. */;
7768 else if (in_system_header || flag_ms_extensions)
7769 /* Allow it, sigh. */;
7771 permerror (input_location, "ISO C++ forbids declaration of %qs with no type", name);
7773 pedwarn (input_location, OPT_pedantic,
7774 "ISO C++ forbids declaration of %qs with no type", name);
7776 warning (OPT_Wreturn_type,
7777 "ISO C++ forbids declaration of %qs with no type", name);
7779 type = integer_type_node;
7784 /* Now process the modifiers that were specified
7785 and check for invalid combinations. */
7787 /* Long double is a special combination. */
7788 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
7791 type = build_qualified_type (long_double_type_node,
7792 cp_type_quals (type));
7795 /* Check all other uses of type modifiers. */
7797 if (unsigned_p || signed_p || long_p || short_p)
7801 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
7802 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
7803 else if (signed_p && unsigned_p)
7804 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
7805 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
7806 error ("%<long long%> invalid for %qs", name);
7807 else if (long_p && TREE_CODE (type) == REAL_TYPE)
7808 error ("%<long%> invalid for %qs", name);
7809 else if (short_p && TREE_CODE (type) == REAL_TYPE)
7810 error ("%<short%> invalid for %qs", name);
7811 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
7812 error ("%<long%> or %<short%> invalid for %qs", name);
7813 else if ((long_p || short_p) && explicit_char)
7814 error ("%<long%> or %<short%> specified with char for %qs", name);
7815 else if (long_p && short_p)
7816 error ("%<long%> and %<short%> specified together for %qs", name);
7817 else if (type == char16_type_node || type == char32_type_node)
7819 if (signed_p || unsigned_p)
7820 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
7821 else if (short_p || long_p)
7822 error ("%<short%> or %<long%> invalid for %qs", name);
7827 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
7829 pedwarn (input_location, OPT_pedantic,
7830 "long, short, signed or unsigned used invalidly for %qs",
7832 if (flag_pedantic_errors)
7837 /* Discard the type modifiers if they are invalid. */
7848 /* Decide whether an integer type is signed or not.
7849 Optionally treat bitfields as signed by default. */
7853 It is implementation-defined whether a plain (neither
7854 explicitly signed or unsigned) char, short, int, or long
7855 bit-field is signed or unsigned.
7857 Naturally, we extend this to long long as well. Note that
7858 this does not include wchar_t. */
7859 || (bitfield && !flag_signed_bitfields
7861 /* A typedef for plain `int' without `signed' can be
7862 controlled just like plain `int', but a typedef for
7863 `signed int' cannot be so controlled. */
7865 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
7866 && TREE_CODE (type) == INTEGER_TYPE
7867 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
7870 type = long_long_unsigned_type_node;
7872 type = long_unsigned_type_node;
7874 type = short_unsigned_type_node;
7875 else if (type == char_type_node)
7876 type = unsigned_char_type_node;
7877 else if (typedef_decl)
7878 type = unsigned_type_for (type);
7880 type = unsigned_type_node;
7882 else if (signed_p && type == char_type_node)
7883 type = signed_char_type_node;
7885 type = long_long_integer_type_node;
7887 type = long_integer_type_node;
7889 type = short_integer_type_node;
7891 if (declspecs->specs[(int)ds_complex])
7893 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
7894 error ("complex invalid for %qs", name);
7895 /* If we just have "complex", it is equivalent to
7896 "complex double", but if any modifiers at all are specified it is
7897 the complex form of TYPE. E.g, "complex short" is
7898 "complex short int". */
7900 else if (defaulted_int && ! longlong
7901 && ! (long_p || short_p || signed_p || unsigned_p))
7902 type = complex_double_type_node;
7903 else if (type == integer_type_node)
7904 type = complex_integer_type_node;
7905 else if (type == float_type_node)
7906 type = complex_float_type_node;
7907 else if (type == double_type_node)
7908 type = complex_double_type_node;
7909 else if (type == long_double_type_node)
7910 type = complex_long_double_type_node;
7912 type = build_complex_type (type);
7915 type_quals = TYPE_UNQUALIFIED;
7916 if (declspecs->specs[(int)ds_const])
7917 type_quals |= TYPE_QUAL_CONST;
7918 if (declspecs->specs[(int)ds_volatile])
7919 type_quals |= TYPE_QUAL_VOLATILE;
7920 if (declspecs->specs[(int)ds_restrict])
7921 type_quals |= TYPE_QUAL_RESTRICT;
7922 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
7923 error ("qualifiers are not allowed on declaration of %<operator %T%>",
7926 if (TREE_CODE (type) == FUNCTION_TYPE
7927 && type_quals != TYPE_UNQUALIFIED)
7929 /* This was an error in C++98 (cv-qualifiers cannot be added to
7930 a function type), but DR 295 makes the code well-formed by
7931 dropping the extra qualifiers. */
7934 tree bad_type = build_qualified_type (type, type_quals);
7935 pedwarn (input_location, OPT_pedantic,
7936 "ignoring %qV qualifiers added to function type %qT",
7939 type_quals = TYPE_UNQUALIFIED;
7941 type_quals |= cp_type_quals (type);
7942 type = cp_build_qualified_type_real
7943 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
7944 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
7945 /* We might have ignored or rejected some of the qualifiers. */
7946 type_quals = cp_type_quals (type);
7949 inlinep = !! declspecs->specs[(int)ds_inline];
7950 virtualp = !! declspecs->specs[(int)ds_virtual];
7951 explicitp = !! declspecs->specs[(int)ds_explicit];
7953 storage_class = declspecs->storage_class;
7954 if (storage_class == sc_static)
7955 staticp = 1 + (decl_context == FIELD);
7957 if (virtualp && staticp == 2)
7959 error ("member %qD cannot be declared both virtual and static", dname);
7960 storage_class = sc_none;
7963 friendp = !! declspecs->specs[(int)ds_friend];
7965 if (dependent_name && !friendp)
7967 error ("%<%T::%D%> is not a valid declarator", ctype, dependent_name);
7968 return error_mark_node;
7971 /* Issue errors about use of storage classes for parameters. */
7972 if (decl_context == PARM)
7974 if (declspecs->specs[(int)ds_typedef])
7976 error ("typedef declaration invalid in parameter declaration");
7977 return error_mark_node;
7979 else if (storage_class == sc_static
7980 || storage_class == sc_extern
7982 error ("storage class specifiers invalid in parameter declarations");
7985 /* Give error if `virtual' is used outside of class declaration. */
7987 && (current_class_name == NULL_TREE || decl_context != FIELD))
7989 error ("%<virtual%> outside class declaration");
7993 /* Static anonymous unions are dealt with here. */
7994 if (staticp && decl_context == TYPENAME
7996 && ANON_AGGR_TYPE_P (declspecs->type))
7997 decl_context = FIELD;
7999 /* Warn about storage classes that are invalid for certain
8000 kinds of declarations (parameters, typenames, etc.). */
8003 && storage_class != sc_extern
8004 && storage_class != sc_static)
8005 || declspecs->specs[(int)ds_typedef]))
8007 error ("multiple storage classes in declaration of %qs", name);
8010 if (decl_context != NORMAL
8011 && ((storage_class != sc_none
8012 && storage_class != sc_mutable)
8015 if ((decl_context == PARM || decl_context == CATCHPARM)
8016 && (storage_class == sc_register
8017 || storage_class == sc_auto))
8019 else if (declspecs->specs[(int)ds_typedef])
8021 else if (decl_context == FIELD
8022 /* C++ allows static class elements. */
8023 && storage_class == sc_static)
8024 /* C++ also allows inlines and signed and unsigned elements,
8025 but in those cases we don't come in here. */
8029 if (decl_context == FIELD)
8030 error ("storage class specified for %qs", name);
8033 if (decl_context == PARM || decl_context == CATCHPARM)
8034 error ("storage class specified for parameter %qs", name);
8036 error ("storage class specified for typename");
8038 if (storage_class == sc_register
8039 || storage_class == sc_auto
8040 || storage_class == sc_extern
8042 storage_class = sc_none;
8045 else if (storage_class == sc_extern && funcdef_flag
8046 && ! toplevel_bindings_p ())
8047 error ("nested function %qs declared %<extern%>", name);
8048 else if (toplevel_bindings_p ())
8050 if (storage_class == sc_auto)
8051 error ("top-level declaration of %qs specifies %<auto%>", name);
8054 && storage_class != sc_extern
8055 && storage_class != sc_static)
8057 error ("function-scope %qs implicitly auto and declared %<__thread%>",
8062 if (storage_class && friendp)
8064 error ("storage class specifiers invalid in friend function declarations");
8065 storage_class = sc_none;
8070 unqualified_id = NULL_TREE;
8073 unqualified_id = id_declarator->u.id.unqualified_name;
8074 switch (TREE_CODE (unqualified_id))
8078 = constructor_name (TREE_OPERAND (unqualified_id, 0));
8081 case IDENTIFIER_NODE:
8082 case TEMPLATE_ID_EXPR:
8090 /* Determine the type of the entity declared by recurring on the
8092 for (; declarator; declarator = declarator->declarator)
8094 const cp_declarator *inner_declarator;
8097 if (type == error_mark_node)
8098 return error_mark_node;
8100 attrs = declarator->attributes;
8106 if (declarator == NULL || declarator->kind == cdk_id)
8107 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
8108 if (declarator->kind == cdk_function)
8109 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
8110 if (declarator->kind == cdk_array)
8111 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
8112 returned_attrs = decl_attributes (&type,
8113 chainon (returned_attrs, attrs),
8117 if (declarator->kind == cdk_id)
8120 inner_declarator = declarator->declarator;
8122 switch (declarator->kind)
8125 type = create_array_type_for_decl (dname, type,
8126 declarator->u.array.bounds);
8134 /* Declaring a function type.
8135 Make sure we have a valid type for the function to return. */
8137 if (type_quals != TYPE_UNQUALIFIED)
8139 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
8140 warning (OPT_Wignored_qualifiers,
8141 "type qualifiers ignored on function return type");
8142 /* We now know that the TYPE_QUALS don't apply to the
8143 decl, but to its return type. */
8144 type_quals = TYPE_UNQUALIFIED;
8145 set_no_warning = true;
8148 /* Error about some types functions can't return. */
8150 if (TREE_CODE (type) == FUNCTION_TYPE)
8152 error ("%qs declared as function returning a function", name);
8153 return error_mark_node;
8155 if (TREE_CODE (type) == ARRAY_TYPE)
8157 error ("%qs declared as function returning an array", name);
8158 return error_mark_node;
8161 /* Pick up type qualifiers which should be applied to `this'. */
8162 memfn_quals = declarator->u.function.qualifiers;
8164 /* Pick up the exception specifications. */
8165 raises = declarator->u.function.exception_specification;
8167 /* Say it's a definition only for the CALL_EXPR
8168 closest to the identifier. */
8169 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
8171 if (ctype == NULL_TREE
8172 && decl_context == FIELD
8174 && (friendp == 0 || dname == current_class_name))
8175 ctype = current_class_type;
8177 if (ctype && (sfk == sfk_constructor
8178 || sfk == sfk_destructor))
8180 /* We are within a class's scope. If our declarator name
8181 is the same as the class name, and we are defining
8182 a function, then it is a constructor/destructor, and
8183 therefore returns a void type. */
8185 /* ISO C++ 12.4/2. A destructor may not be declared
8186 const or volatile. A destructor may not be
8189 ISO C++ 12.1. A constructor may not be declared
8190 const or volatile. A constructor may not be
8191 virtual. A constructor may not be static. */
8193 error ((flags == DTOR_FLAG)
8194 ? "destructor cannot be static member function"
8195 : "constructor cannot be static member function");
8198 error ((flags == DTOR_FLAG)
8199 ? "destructors may not be cv-qualified"
8200 : "constructors may not be cv-qualified");
8201 memfn_quals = TYPE_UNQUALIFIED;
8204 if (decl_context == FIELD
8205 && !member_function_or_else (ctype,
8208 return error_mark_node;
8210 if (flags != DTOR_FLAG)
8212 /* It's a constructor. */
8217 permerror (input_location, "constructors cannot be declared virtual");
8220 if (decl_context == FIELD
8221 && sfk != sfk_constructor)
8222 return error_mark_node;
8224 if (decl_context == FIELD)
8230 error ("can't initialize friend function %qs", name);
8233 /* Cannot be both friend and virtual. */
8234 error ("virtual functions cannot be friends");
8237 if (decl_context == NORMAL)
8238 error ("friend declaration not in class definition");
8239 if (current_function_decl && funcdef_flag)
8240 error ("can't define friend function %qs in a local "
8245 arg_types = grokparms (declarator->u.function.parameters,
8248 if (inner_declarator
8249 && inner_declarator->kind == cdk_id
8250 && inner_declarator->u.id.sfk == sfk_destructor
8251 && arg_types != void_list_node)
8253 error ("destructors may not have parameters");
8254 arg_types = void_list_node;
8258 type = build_function_type (type, arg_types);
8265 /* Filter out pointers-to-references and references-to-references.
8266 We can get these if a TYPE_DECL is used. */
8268 if (TREE_CODE (type) == REFERENCE_TYPE)
8270 if (declarator->kind != cdk_reference)
8272 error ("cannot declare pointer to %q#T", type);
8273 type = TREE_TYPE (type);
8276 /* In C++0x, we allow reference to reference declarations
8277 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
8278 and template type arguments [14.3.1/4 temp.arg.type]. The
8279 check for direct reference to reference declarations, which
8280 are still forbidden, occurs below. Reasoning behind the change
8281 can be found in DR106, DR540, and the rvalue reference
8283 else if (cxx_dialect == cxx98)
8285 error ("cannot declare reference to %q#T", type);
8286 type = TREE_TYPE (type);
8289 else if (VOID_TYPE_P (type))
8291 if (declarator->kind == cdk_reference)
8292 error ("cannot declare reference to %q#T", type);
8293 else if (declarator->kind == cdk_ptrmem)
8294 error ("cannot declare pointer to %q#T member", type);
8297 /* We now know that the TYPE_QUALS don't apply to the decl,
8298 but to the target of the pointer. */
8299 type_quals = TYPE_UNQUALIFIED;
8301 if (declarator->kind == cdk_ptrmem
8302 && (TREE_CODE (type) == FUNCTION_TYPE
8303 || (memfn_quals && TREE_CODE (type) == METHOD_TYPE)))
8305 memfn_quals |= cp_type_quals (type);
8306 type = build_memfn_type (type,
8307 declarator->u.pointer.class_type,
8309 memfn_quals = TYPE_UNQUALIFIED;
8312 if (declarator->kind == cdk_reference)
8314 /* In C++0x, the type we are creating a reference to might be
8315 a typedef which is itself a reference type. In that case,
8316 we follow the reference collapsing rules in
8317 [7.1.3/8 dcl.typedef] to create the final reference type:
8319 "If a typedef TD names a type that is a reference to a type
8320 T, an attempt to create the type 'lvalue reference to cv TD'
8321 creates the type 'lvalue reference to T,' while an attempt
8322 to create the type "rvalue reference to cv TD' creates the
8325 if (!VOID_TYPE_P (type))
8326 type = cp_build_reference_type
8327 ((TREE_CODE (type) == REFERENCE_TYPE
8328 ? TREE_TYPE (type) : type),
8329 (declarator->u.reference.rvalue_ref
8330 && (TREE_CODE(type) != REFERENCE_TYPE
8331 || TYPE_REF_IS_RVALUE (type))));
8333 /* In C++0x, we need this check for direct reference to
8334 reference declarations, which are forbidden by
8335 [8.3.2/5 dcl.ref]. Reference to reference declarations
8336 are only allowed indirectly through typedefs and template
8337 type arguments. Example:
8339 void foo(int & &); // invalid ref-to-ref decl
8341 typedef int & int_ref;
8342 void foo(int_ref &); // valid ref-to-ref decl
8344 if (inner_declarator && inner_declarator->kind == cdk_reference)
8345 error ("cannot declare reference to %q#T, which is not "
8346 "a typedef or a template type argument", type);
8348 else if (TREE_CODE (type) == METHOD_TYPE)
8349 type = build_ptrmemfunc_type (build_pointer_type (type));
8350 else if (declarator->kind == cdk_ptrmem)
8352 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
8354 if (declarator->u.pointer.class_type == error_mark_node)
8355 /* We will already have complained. */
8356 type = error_mark_node;
8358 type = build_ptrmem_type (declarator->u.pointer.class_type,
8362 type = build_pointer_type (type);
8364 /* Process a list of type modifier keywords (such as
8365 const or volatile) that were given inside the `*' or `&'. */
8367 if (declarator->u.pointer.qualifiers)
8370 = cp_build_qualified_type (type,
8371 declarator->u.pointer.qualifiers);
8372 type_quals = cp_type_quals (type);
8385 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
8386 && TREE_CODE (type) != FUNCTION_TYPE
8387 && TREE_CODE (type) != METHOD_TYPE)
8389 error ("template-id %qD used as a declarator",
8391 unqualified_id = dname;
8394 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
8395 qualified with a class-name, turn it into a METHOD_TYPE, unless
8396 we know that the function is static. We take advantage of this
8397 opportunity to do other processing that pertains to entities
8398 explicitly declared to be class members. Note that if DECLARATOR
8399 is non-NULL, we know it is a cdk_id declarator; otherwise, we
8400 would not have exited the loop above. */
8402 && declarator->u.id.qualifying_scope
8403 && TYPE_P (declarator->u.id.qualifying_scope))
8407 ctype = declarator->u.id.qualifying_scope;
8408 ctype = TYPE_MAIN_VARIANT (ctype);
8410 while (t != NULL_TREE && CLASS_TYPE_P (t))
8412 /* You're supposed to have one `template <...>' for every
8413 template class, but you don't need one for a full
8414 specialization. For example:
8416 template <class T> struct S{};
8417 template <> struct S<int> { void f(); };
8418 void S<int>::f () {}
8420 is correct; there shouldn't be a `template <>' for the
8421 definition of `S<int>::f'. */
8422 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
8423 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
8424 /* T is an explicit (not partial) specialization. All
8425 containing classes must therefore also be explicitly
8428 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
8429 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
8430 template_count += 1;
8432 t = TYPE_MAIN_DECL (t);
8433 t = DECL_CONTEXT (t);
8436 if (ctype == current_class_type)
8440 permerror (input_location, "member functions are implicitly friends of their class");
8444 permerror (declarator->id_loc,
8445 "extra qualification %<%T::%> on member %qs",
8448 else if (/* If the qualifying type is already complete, then we
8449 can skip the following checks. */
8450 !COMPLETE_TYPE_P (ctype)
8451 && (/* If the function is being defined, then
8452 qualifying type must certainly be complete. */
8454 /* A friend declaration of "T::f" is OK, even if
8455 "T" is a template parameter. But, if this
8456 function is not a friend, the qualifying type
8458 || (!friendp && !CLASS_TYPE_P (ctype))
8459 /* For a declaration, the type need not be
8460 complete, if either it is dependent (since there
8461 is no meaningful definition of complete in that
8462 case) or the qualifying class is currently being
8464 || !(dependent_type_p (ctype)
8465 || currently_open_class (ctype)))
8466 /* Check that the qualifying type is complete. */
8467 && !complete_type_or_else (ctype, NULL_TREE))
8468 return error_mark_node;
8469 else if (TREE_CODE (type) == FUNCTION_TYPE)
8471 tree sname = declarator->u.id.unqualified_name;
8473 if (current_class_type
8474 && (!friendp || funcdef_flag))
8477 ? "cannot define member function %<%T::%s%> within %<%T%>"
8478 : "cannot declare member function %<%T::%s%> within %<%T%>",
8479 ctype, name, current_class_type);
8480 return error_mark_node;
8483 if (TREE_CODE (sname) == IDENTIFIER_NODE
8484 && NEW_DELETE_OPNAME_P (sname))
8485 /* Overloaded operator new and operator delete
8486 are always static functions. */
8489 type = build_memfn_type (type, ctype, memfn_quals);
8491 else if (declspecs->specs[(int)ds_typedef]
8492 && current_class_type)
8494 error ("cannot declare member %<%T::%s%> within %qT",
8495 ctype, name, current_class_type);
8496 return error_mark_node;
8500 /* Now TYPE has the actual type. */
8505 *attrlist = chainon (returned_attrs, *attrlist);
8507 attrlist = &returned_attrs;
8510 /* Handle parameter packs. */
8511 if (parameter_pack_p)
8513 if (decl_context == PARM)
8514 /* Turn the type into a pack expansion.*/
8515 type = make_pack_expansion (type);
8517 error ("non-parameter %qs cannot be a parameter pack", name);
8520 /* Did array size calculations overflow? */
8522 if (TREE_CODE (type) == ARRAY_TYPE
8523 && COMPLETE_TYPE_P (type)
8524 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
8525 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
8527 error ("size of array %qs is too large", name);
8528 /* If we proceed with the array type as it is, we'll eventually
8529 crash in tree_low_cst(). */
8530 type = error_mark_node;
8533 if ((decl_context == FIELD || decl_context == PARM)
8534 && !processing_template_decl
8535 && variably_modified_type_p (type, NULL_TREE))
8537 if (decl_context == FIELD)
8538 error ("data member may not have variably modified type %qT", type);
8540 error ("parameter may not have variably modified type %qT", type);
8541 type = error_mark_node;
8544 if (explicitp == 1 || (explicitp && friendp))
8546 /* [dcl.fct.spec] The explicit specifier shall only be used in
8547 declarations of constructors within a class definition. */
8548 error ("only declarations of constructors can be %<explicit%>");
8552 if (storage_class == sc_mutable)
8554 if (decl_context != FIELD || friendp)
8556 error ("non-member %qs cannot be declared %<mutable%>", name);
8557 storage_class = sc_none;
8559 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
8561 error ("non-object member %qs cannot be declared %<mutable%>", name);
8562 storage_class = sc_none;
8564 else if (TREE_CODE (type) == FUNCTION_TYPE
8565 || TREE_CODE (type) == METHOD_TYPE)
8567 error ("function %qs cannot be declared %<mutable%>", name);
8568 storage_class = sc_none;
8572 error ("static %qs cannot be declared %<mutable%>", name);
8573 storage_class = sc_none;
8575 else if (type_quals & TYPE_QUAL_CONST)
8577 error ("const %qs cannot be declared %<mutable%>", name);
8578 storage_class = sc_none;
8582 /* If this is declaring a typedef name, return a TYPE_DECL. */
8583 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
8587 /* Note that the grammar rejects storage classes
8588 in typenames, fields or parameters. */
8589 if (current_lang_name == lang_name_java)
8590 TYPE_FOR_JAVA (type) = 1;
8592 /* This declaration:
8594 typedef void f(int) const;
8596 declares a function type which is not a member of any
8597 particular class, but which is cv-qualified; for
8598 example "f S::*" declares a pointer to a const-qualified
8599 member function of S. We record the cv-qualification in the
8601 if (memfn_quals && TREE_CODE (type) == FUNCTION_TYPE)
8603 type = cp_build_qualified_type (type, memfn_quals);
8605 /* We have now dealt with these qualifiers. */
8606 memfn_quals = TYPE_UNQUALIFIED;
8609 if (decl_context == FIELD)
8610 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
8612 decl = build_decl (TYPE_DECL, unqualified_id, type);
8613 if (id_declarator && declarator->u.id.qualifying_scope)
8614 error ("%Jtypedef name may not be a nested-name-specifier", decl);
8616 if (decl_context != FIELD)
8618 if (!current_function_decl)
8619 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
8620 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
8621 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
8622 (current_function_decl)))
8623 /* The TYPE_DECL is "abstract" because there will be
8624 clones of this constructor/destructor, and there will
8625 be copies of this TYPE_DECL generated in those
8627 DECL_ABSTRACT (decl) = 1;
8629 else if (constructor_name_p (unqualified_id, current_class_type))
8630 permerror (input_location, "ISO C++ forbids nested type %qD with same name "
8631 "as enclosing class",
8634 /* If the user declares "typedef struct {...} foo" then the
8635 struct will have an anonymous name. Fill that name in now.
8636 Nothing can refer to it, so nothing needs know about the name
8638 if (type != error_mark_node
8641 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
8642 && TYPE_ANONYMOUS_P (type)
8643 && cp_type_quals (type) == TYPE_UNQUALIFIED)
8645 tree oldname = TYPE_NAME (type);
8648 /* Replace the anonymous name with the real name everywhere. */
8649 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
8650 if (TYPE_NAME (t) == oldname)
8651 TYPE_NAME (t) = decl;
8653 if (TYPE_LANG_SPECIFIC (type))
8654 TYPE_WAS_ANONYMOUS (type) = 1;
8656 /* If this is a typedef within a template class, the nested
8657 type is a (non-primary) template. The name for the
8658 template needs updating as well. */
8659 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
8660 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
8661 = TYPE_IDENTIFIER (type);
8663 /* FIXME remangle member functions; member functions of a
8664 type with external linkage have external linkage. */
8668 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
8669 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
8671 bad_specifiers (decl, "type", virtualp,
8672 memfn_quals != TYPE_UNQUALIFIED,
8673 inlinep, friendp, raises != NULL_TREE);
8678 /* Detect the case of an array type of unspecified size
8679 which came, as such, direct from a typedef name.
8680 We must copy the type, so that the array's domain can be
8681 individually set by the object's initializer. */
8683 if (type && typedef_type
8684 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
8685 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
8686 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
8688 /* Detect where we're using a typedef of function type to declare a
8689 function. PARMS will not be set, so we must create it now. */
8691 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
8693 tree decls = NULL_TREE;
8696 for (args = TYPE_ARG_TYPES (type); args; args = TREE_CHAIN (args))
8698 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
8700 TREE_CHAIN (decl) = decls;
8704 parms = nreverse (decls);
8706 if (decl_context != TYPENAME)
8708 /* A cv-qualifier-seq shall only be part of the function type
8709 for a non-static member function. [8.3.5/4 dcl.fct] */
8710 if (cp_type_quals (type) != TYPE_UNQUALIFIED
8711 && (current_class_type == NULL_TREE || staticp) )
8714 ? G_("qualified function types cannot be used to "
8715 "declare static member functions")
8716 : G_("qualified function types cannot be used to "
8717 "declare free functions"));
8718 type = TYPE_MAIN_VARIANT (type);
8721 /* The qualifiers on the function type become the qualifiers on
8722 the non-static member function. */
8723 memfn_quals |= cp_type_quals (type);
8727 /* If this is a type name (such as, in a cast or sizeof),
8728 compute the type and return it now. */
8730 if (decl_context == TYPENAME)
8732 /* Note that the grammar rejects storage classes
8733 in typenames, fields or parameters. */
8734 if (type_quals != TYPE_UNQUALIFIED)
8735 type_quals = TYPE_UNQUALIFIED;
8737 /* Special case: "friend class foo" looks like a TYPENAME context. */
8740 if (type_quals != TYPE_UNQUALIFIED)
8742 error ("type qualifiers specified for friend class declaration");
8743 type_quals = TYPE_UNQUALIFIED;
8747 error ("%<inline%> specified for friend class declaration");
8753 /* Don't allow friend declaration without a class-key. */
8754 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
8755 permerror (input_location, "template parameters cannot be friends");
8756 else if (TREE_CODE (type) == TYPENAME_TYPE)
8757 permerror (input_location, "friend declaration requires class-key, "
8758 "i.e. %<friend class %T::%D%>",
8759 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
8761 permerror (input_location, "friend declaration requires class-key, "
8762 "i.e. %<friend %#T%>",
8766 /* Only try to do this stuff if we didn't already give up. */
8767 if (type != integer_type_node)
8769 /* A friendly class? */
8770 if (current_class_type)
8771 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
8774 error ("trying to make class %qT a friend of global scope",
8777 type = void_type_node;
8780 else if (memfn_quals)
8782 if (ctype == NULL_TREE)
8784 if (TREE_CODE (type) != METHOD_TYPE)
8785 error ("invalid qualifiers on non-member function type");
8787 ctype = TYPE_METHOD_BASETYPE (type);
8790 type = build_memfn_type (type, ctype, memfn_quals);
8795 else if (unqualified_id == NULL_TREE && decl_context != PARM
8796 && decl_context != CATCHPARM
8797 && TREE_CODE (type) != UNION_TYPE
8800 error ("abstract declarator %qT used as declaration", type);
8801 return error_mark_node;
8804 /* Only functions may be declared using an operator-function-id. */
8806 && IDENTIFIER_OPNAME_P (unqualified_id)
8807 && TREE_CODE (type) != FUNCTION_TYPE
8808 && TREE_CODE (type) != METHOD_TYPE)
8810 error ("declaration of %qD as non-function", unqualified_id);
8811 return error_mark_node;
8814 /* We don't check parameter types here because we can emit a better
8815 error message later. */
8816 if (decl_context != PARM)
8818 type = check_var_type (unqualified_id, type);
8819 if (type == error_mark_node)
8820 return error_mark_node;
8823 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
8824 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
8826 if (decl_context == PARM || decl_context == CATCHPARM)
8828 if (ctype || in_namespace)
8829 error ("cannot use %<::%> in parameter declaration");
8831 /* A parameter declared as an array of T is really a pointer to T.
8832 One declared as a function is really a pointer to a function.
8833 One declared as a member is really a pointer to member. */
8835 if (TREE_CODE (type) == ARRAY_TYPE)
8837 /* Transfer const-ness of array into that of type pointed to. */
8838 type = build_pointer_type (TREE_TYPE (type));
8839 type_quals = TYPE_UNQUALIFIED;
8841 else if (TREE_CODE (type) == FUNCTION_TYPE)
8842 type = build_pointer_type (type);
8848 if (decl_context == PARM)
8850 decl = cp_build_parm_decl (unqualified_id, type);
8852 bad_specifiers (decl, "parameter", virtualp,
8853 memfn_quals != TYPE_UNQUALIFIED,
8854 inlinep, friendp, raises != NULL_TREE);
8856 else if (decl_context == FIELD)
8858 /* The C99 flexible array extension. */
8859 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
8860 && TYPE_DOMAIN (type) == NULL_TREE)
8862 tree itype = compute_array_index_type (dname, integer_zero_node);
8863 type = build_cplus_array_type (TREE_TYPE (type), itype);
8866 if (type == error_mark_node)
8868 /* Happens when declaring arrays of sizes which
8869 are error_mark_node, for example. */
8872 else if (in_namespace && !friendp)
8874 /* Something like struct S { int N::j; }; */
8875 error ("invalid use of %<::%>");
8876 return error_mark_node;
8878 else if (TREE_CODE (type) == FUNCTION_TYPE)
8881 tree function_context;
8885 if (ctype == NULL_TREE)
8886 ctype = current_class_type;
8888 if (ctype == NULL_TREE)
8890 error ("can't make %qD into a method -- not in a class",
8892 return error_mark_node;
8895 /* ``A union may [ ... ] not [ have ] virtual functions.''
8897 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
8899 error ("function %qD declared virtual inside a union",
8901 return error_mark_node;
8904 if (NEW_DELETE_OPNAME_P (unqualified_id))
8908 error ("%qD cannot be declared virtual, since it "
8914 else if (staticp < 2)
8915 type = build_memfn_type (type, ctype, memfn_quals);
8918 /* Check that the name used for a destructor makes sense. */
8919 if (sfk == sfk_destructor)
8923 gcc_assert (friendp);
8924 error ("expected qualified name in friend declaration "
8925 "for destructor %qD",
8926 id_declarator->u.id.unqualified_name);
8927 return error_mark_node;
8930 if (!same_type_p (TREE_OPERAND
8931 (id_declarator->u.id.unqualified_name, 0),
8934 error ("declaration of %qD as member of %qT",
8935 id_declarator->u.id.unqualified_name, ctype);
8936 return error_mark_node;
8939 else if (sfk == sfk_constructor && friendp)
8941 error ("expected qualified name in friend declaration "
8942 "for constructor %qD",
8943 id_declarator->u.id.unqualified_name);
8944 return error_mark_node;
8947 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
8948 function_context = (ctype != NULL_TREE) ?
8949 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
8950 publicp = (! friendp || ! staticp)
8951 && function_context == NULL_TREE;
8952 decl = grokfndecl (ctype, type,
8953 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
8954 ? unqualified_id : dname,
8957 virtualp, flags, memfn_quals, raises,
8958 friendp ? -1 : 0, friendp, publicp, inlinep,
8960 funcdef_flag, template_count, in_namespace, attrlist);
8961 if (decl == NULL_TREE)
8962 return error_mark_node;
8964 /* This clobbers the attrs stored in `decl' from `attrlist'. */
8965 /* The decl and setting of decl_attr is also turned off. */
8966 decl = build_decl_attribute_variant (decl, decl_attr);
8969 /* [class.conv.ctor]
8971 A constructor declared without the function-specifier
8972 explicit that can be called with a single parameter
8973 specifies a conversion from the type of its first
8974 parameter to the type of its class. Such a constructor
8975 is called a converting constructor. */
8977 DECL_NONCONVERTING_P (decl) = 1;
8978 else if (DECL_CONSTRUCTOR_P (decl))
8980 /* A constructor with no parms is not a conversion.
8981 Ignore any compiler-added parms. */
8982 tree arg_types = FUNCTION_FIRST_USER_PARMTYPE (decl);
8984 if (arg_types == void_list_node)
8985 DECL_NONCONVERTING_P (decl) = 1;
8988 else if (TREE_CODE (type) == METHOD_TYPE)
8990 /* We only get here for friend declarations of
8991 members of other classes. */
8992 /* All method decls are public, so tell grokfndecl to set
8993 TREE_PUBLIC, also. */
8994 decl = grokfndecl (ctype, type,
8995 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
8996 ? unqualified_id : dname,
8999 virtualp, flags, memfn_quals, raises,
9000 friendp ? -1 : 0, friendp, 1, 0, sfk,
9001 funcdef_flag, template_count, in_namespace,
9003 if (decl == NULL_TREE)
9004 return error_mark_node;
9006 else if (!staticp && !dependent_type_p (type)
9007 && !COMPLETE_TYPE_P (complete_type (type))
9008 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
9011 error ("field %qD has incomplete type", unqualified_id);
9013 error ("name %qT has incomplete type", type);
9015 /* If we're instantiating a template, tell them which
9016 instantiation made the field's type be incomplete. */
9017 if (current_class_type
9018 && TYPE_NAME (current_class_type)
9019 && IDENTIFIER_TEMPLATE (TYPE_IDENTIFIER (current_class_type))
9021 && declspecs->type == type)
9022 error (" in instantiation of template %qT",
9023 current_class_type);
9025 return error_mark_node;
9031 error ("%qE is neither function nor member function; "
9032 "cannot be declared friend", unqualified_id);
9040 /* Friends are treated specially. */
9041 if (ctype == current_class_type)
9042 ; /* We already issued a permerror. */
9043 else if (decl && DECL_NAME (decl))
9045 if (template_class_depth (current_class_type) == 0)
9047 decl = check_explicit_specialization
9048 (unqualified_id, decl, template_count,
9049 2 * funcdef_flag + 4);
9050 if (decl == error_mark_node)
9051 return error_mark_node;
9054 decl = do_friend (ctype, unqualified_id, decl,
9060 return error_mark_node;
9063 /* Structure field. It may not be a function, except for C++. */
9065 if (decl == NULL_TREE)
9071 /* An attempt is being made to initialize a non-static
9072 member. But, from [class.mem]:
9074 4 A member-declarator can contain a
9075 constant-initializer only if it declares a static
9076 member (_class.static_) of integral or enumeration
9077 type, see _class.static.data_.
9079 This used to be relatively common practice, but
9080 the rest of the compiler does not correctly
9081 handle the initialization unless the member is
9082 static so we make it static below. */
9083 permerror (input_location, "ISO C++ forbids initialization of member %qD",
9085 permerror (input_location, "making %qD static", unqualified_id);
9089 if (uses_template_parms (type))
9090 /* We'll check at instantiation time. */
9092 else if (check_static_variable_definition (unqualified_id,
9094 /* If we just return the declaration, crashes
9095 will sometimes occur. We therefore return
9096 void_type_node, as if this was a friend
9097 declaration, to cause callers to completely
9098 ignore this declaration. */
9099 return error_mark_node;
9104 /* C++ allows static class members. All other work
9105 for this is done by grokfield. */
9106 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
9107 set_linkage_for_static_data_member (decl);
9108 /* Even if there is an in-class initialization, DECL
9109 is considered undefined until an out-of-class
9110 definition is provided. */
9111 DECL_EXTERNAL (decl) = 1;
9114 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
9118 decl = build_decl (FIELD_DECL, unqualified_id, type);
9119 DECL_NONADDRESSABLE_P (decl) = bitfield;
9120 if (bitfield && !unqualified_id)
9121 TREE_NO_WARNING (decl) = 1;
9123 if (storage_class == sc_mutable)
9125 DECL_MUTABLE_P (decl) = 1;
9126 storage_class = sc_none;
9130 bad_specifiers (decl, "field", virtualp,
9131 memfn_quals != TYPE_UNQUALIFIED,
9132 inlinep, friendp, raises != NULL_TREE);
9135 else if (TREE_CODE (type) == FUNCTION_TYPE
9136 || TREE_CODE (type) == METHOD_TYPE)
9141 if (!unqualified_id)
9142 return error_mark_node;
9144 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
9145 original_name = dname;
9147 original_name = unqualified_id;
9149 if (storage_class == sc_auto)
9150 error ("storage class %<auto%> invalid for function %qs", name);
9151 else if (storage_class == sc_register)
9152 error ("storage class %<register%> invalid for function %qs", name);
9154 error ("storage class %<__thread%> invalid for function %qs", name);
9156 /* Function declaration not at top level.
9157 Storage classes other than `extern' are not allowed
9158 and `extern' makes no difference. */
9159 if (! toplevel_bindings_p ()
9160 && (storage_class == sc_static
9161 || declspecs->specs[(int)ds_inline])
9164 if (storage_class == sc_static)
9165 pedwarn (input_location, OPT_pedantic,
9166 "%<static%> specified invalid for function %qs "
9167 "declared out of global scope", name);
9169 pedwarn (input_location, OPT_pedantic,
9170 "%<inline%> specifier invalid for function %qs "
9171 "declared out of global scope", name);
9174 if (ctype == NULL_TREE)
9178 error ("virtual non-class function %qs", name);
9182 else if (TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
9183 && !NEW_DELETE_OPNAME_P (original_name))
9184 type = build_method_type_directly (ctype,
9186 TYPE_ARG_TYPES (type));
9188 /* Record presence of `static'. */
9189 publicp = (ctype != NULL_TREE
9190 || storage_class == sc_extern
9191 || storage_class != sc_static);
9193 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
9194 virtualp, flags, memfn_quals, raises,
9196 publicp, inlinep, sfk, funcdef_flag,
9197 template_count, in_namespace, attrlist);
9198 if (decl == NULL_TREE)
9199 return error_mark_node;
9203 int invalid_static = 0;
9205 /* Don't allow a static member function in a class, and forbid
9206 declaring main to be static. */
9207 if (TREE_CODE (type) == METHOD_TYPE)
9209 permerror (input_location, "cannot declare member function %qD to have "
9210 "static linkage", decl);
9213 else if (current_function_decl)
9215 /* FIXME need arm citation */
9216 error ("cannot declare static function inside another function");
9223 storage_class = sc_none;
9229 /* It's a variable. */
9231 /* An uninitialized decl with `extern' is a reference. */
9232 decl = grokvardecl (type, unqualified_id,
9235 (type_quals & TYPE_QUAL_CONST) != 0,
9236 ctype ? ctype : in_namespace);
9237 bad_specifiers (decl, "variable", virtualp,
9238 memfn_quals != TYPE_UNQUALIFIED,
9239 inlinep, friendp, raises != NULL_TREE);
9243 DECL_CONTEXT (decl) = ctype;
9246 permerror (input_location, "%<static%> may not be used when defining "
9247 "(as opposed to declaring) a static data member");
9249 storage_class = sc_none;
9251 if (storage_class == sc_register && TREE_STATIC (decl))
9253 error ("static member %qD declared %<register%>", decl);
9254 storage_class = sc_none;
9256 if (storage_class == sc_extern && pedantic)
9258 pedwarn (input_location, OPT_pedantic,
9259 "cannot explicitly declare member %q#D to have "
9260 "extern linkage", decl);
9261 storage_class = sc_none;
9266 if (storage_class == sc_extern && initialized && !funcdef_flag)
9268 if (toplevel_bindings_p ())
9270 /* It's common practice (and completely valid) to have a const
9271 be initialized and declared extern. */
9272 if (!(type_quals & TYPE_QUAL_CONST))
9273 warning (0, "%qs initialized and declared %<extern%>", name);
9277 error ("%qs has both %<extern%> and initializer", name);
9278 return error_mark_node;
9282 /* Record `register' declaration for warnings on &
9283 and in case doing stupid register allocation. */
9285 if (storage_class == sc_register)
9286 DECL_REGISTER (decl) = 1;
9287 else if (storage_class == sc_extern)
9288 DECL_THIS_EXTERN (decl) = 1;
9289 else if (storage_class == sc_static)
9290 DECL_THIS_STATIC (decl) = 1;
9292 /* Record constancy and volatility on the DECL itself . There's
9293 no need to do this when processing a template; we'll do this
9294 for the instantiated declaration based on the type of DECL. */
9295 if (!processing_template_decl)
9296 cp_apply_type_quals_to_decl (type_quals, decl);
9299 TREE_NO_WARNING (decl) = 1;
9305 /* Subroutine of start_function. Ensure that each of the parameter
9306 types (as listed in PARMS) is complete, as is required for a
9307 function definition. */
9310 require_complete_types_for_parms (tree parms)
9312 for (; parms; parms = TREE_CHAIN (parms))
9314 if (dependent_type_p (TREE_TYPE (parms)))
9316 if (!VOID_TYPE_P (TREE_TYPE (parms))
9317 && complete_type_or_else (TREE_TYPE (parms), parms))
9319 relayout_decl (parms);
9320 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
9323 /* grokparms or complete_type_or_else will have already issued
9325 TREE_TYPE (parms) = error_mark_node;
9329 /* Returns nonzero if T is a local variable. */
9332 local_variable_p (const_tree t)
9334 if ((TREE_CODE (t) == VAR_DECL
9335 /* A VAR_DECL with a context that is a _TYPE is a static data
9337 && !TYPE_P (CP_DECL_CONTEXT (t))
9338 /* Any other non-local variable must be at namespace scope. */
9339 && !DECL_NAMESPACE_SCOPE_P (t))
9340 || (TREE_CODE (t) == PARM_DECL))
9346 /* Like local_variable_p, but suitable for use as a tree-walking
9350 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
9351 void *data ATTRIBUTE_UNUSED)
9353 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
9355 else if (TYPE_P (*tp))
9362 /* Check that ARG, which is a default-argument expression for a
9363 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
9364 something goes wrong. DECL may also be a _TYPE node, rather than a
9365 DECL, if there is no DECL available. */
9368 check_default_argument (tree decl, tree arg)
9373 if (TREE_CODE (arg) == DEFAULT_ARG)
9374 /* We get a DEFAULT_ARG when looking at an in-class declaration
9375 with a default argument. Ignore the argument for now; we'll
9376 deal with it after the class is complete. */
9385 decl_type = TREE_TYPE (decl);
9387 if (arg == error_mark_node
9388 || decl == error_mark_node
9389 || TREE_TYPE (arg) == error_mark_node
9390 || decl_type == error_mark_node)
9391 /* Something already went wrong. There's no need to check
9393 return error_mark_node;
9395 /* [dcl.fct.default]
9397 A default argument expression is implicitly converted to the
9399 if (!TREE_TYPE (arg)
9400 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
9403 error ("default argument for %q#D has type %qT",
9404 decl, TREE_TYPE (arg));
9406 error ("default argument for parameter of type %qT has type %qT",
9407 decl_type, TREE_TYPE (arg));
9409 return error_mark_node;
9412 /* [dcl.fct.default]
9414 Local variables shall not be used in default argument
9417 The keyword `this' shall not be used in a default argument of a
9419 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
9422 error ("default argument %qE uses local variable %qD", arg, var);
9423 return error_mark_node;
9430 /* Decode the list of parameter types for a function type.
9431 Given the list of things declared inside the parens,
9432 return a list of types.
9434 If this parameter does not end with an ellipsis, we append
9437 *PARMS is set to the chain of PARM_DECLs created. */
9440 grokparms (cp_parameter_declarator *first_parm, tree *parms)
9442 tree result = NULL_TREE;
9443 tree decls = NULL_TREE;
9444 int ellipsis = !first_parm || first_parm->ellipsis_p;
9445 cp_parameter_declarator *parm;
9447 struct pointer_set_t *unique_decls = pointer_set_create ();
9449 for (parm = first_parm; parm != NULL; parm = parm->next)
9451 tree type = NULL_TREE;
9452 tree init = parm->default_argument;
9456 if (parm == no_parameters)
9459 attrs = parm->decl_specifiers.attributes;
9460 parm->decl_specifiers.attributes = NULL_TREE;
9461 decl = grokdeclarator (parm->declarator, &parm->decl_specifiers,
9462 PARM, init != NULL_TREE, &attrs);
9463 if (! decl || TREE_TYPE (decl) == error_mark_node)
9467 cplus_decl_attributes (&decl, attrs, 0);
9469 type = TREE_TYPE (decl);
9470 if (VOID_TYPE_P (type))
9472 if (same_type_p (type, void_type_node)
9473 && DECL_SELF_REFERENCE_P (type)
9474 && !DECL_NAME (decl) && !result && !parm->next && !ellipsis)
9475 /* this is a parmlist of `(void)', which is ok. */
9477 cxx_incomplete_type_error (decl, type);
9478 /* It's not a good idea to actually create parameters of
9479 type `void'; other parts of the compiler assume that a
9480 void type terminates the parameter list. */
9481 type = error_mark_node;
9482 TREE_TYPE (decl) = error_mark_node;
9485 if (type != error_mark_node
9486 && TYPE_FOR_JAVA (type)
9487 && MAYBE_CLASS_TYPE_P (type))
9489 error ("parameter %qD has Java class type", decl);
9490 type = error_mark_node;
9491 TREE_TYPE (decl) = error_mark_node;
9495 if (type != error_mark_node)
9497 /* Top-level qualifiers on the parameters are
9498 ignored for function types. */
9499 type = cp_build_qualified_type (type, 0);
9500 if (TREE_CODE (type) == METHOD_TYPE)
9502 error ("parameter %qD invalidly declared method type", decl);
9503 type = build_pointer_type (type);
9504 TREE_TYPE (decl) = type;
9506 else if (abstract_virtuals_error (decl, type))
9507 any_error = 1; /* Seems like a good idea. */
9508 else if (POINTER_TYPE_P (type))
9510 /* [dcl.fct]/6, parameter types cannot contain pointers
9511 (references) to arrays of unknown bound. */
9512 tree t = TREE_TYPE (type);
9513 int ptr = TYPE_PTR_P (type);
9519 else if (TREE_CODE (t) != ARRAY_TYPE)
9521 else if (!TYPE_DOMAIN (t))
9525 if (TREE_CODE (t) == ARRAY_TYPE)
9526 error ("parameter %qD includes %s to array of unknown "
9528 decl, ptr ? "pointer" : "reference", t);
9533 else if (init && !processing_template_decl)
9534 init = check_default_argument (decl, init);
9537 if (TREE_CODE (decl) == PARM_DECL
9538 && FUNCTION_PARAMETER_PACK_P (decl)
9540 error ("parameter packs must be at the end of the parameter list");
9542 if (DECL_NAME (decl))
9544 if (pointer_set_contains (unique_decls, DECL_NAME (decl)))
9545 error ("multiple parameters named %qE", DECL_NAME (decl));
9547 pointer_set_insert (unique_decls, DECL_NAME (decl));
9550 TREE_CHAIN (decl) = decls;
9552 result = tree_cons (init, type, result);
9554 decls = nreverse (decls);
9555 result = nreverse (result);
9557 result = chainon (result, void_list_node);
9560 pointer_set_destroy (unique_decls);
9565 /* D is a constructor or overloaded `operator='.
9567 Let T be the class in which D is declared. Then, this function
9570 -1 if D's is an ill-formed constructor or copy assignment operator
9571 whose first parameter is of type `T'.
9572 0 if D is not a copy constructor or copy assignment
9574 1 if D is a copy constructor or copy assignment operator whose
9575 first parameter is a reference to const qualified T.
9576 2 if D is a copy constructor or copy assignment operator whose
9577 first parameter is a reference to non-const qualified T.
9579 This function can be used as a predicate. Positive values indicate
9580 a copy constructor and nonzero values indicate a copy assignment
9584 copy_fn_p (const_tree d)
9590 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
9592 if (TREE_CODE (d) == TEMPLATE_DECL
9593 || (DECL_TEMPLATE_INFO (d)
9594 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
9595 /* Instantiations of template member functions are never copy
9596 functions. Note that member functions of templated classes are
9597 represented as template functions internally, and we must
9598 accept those as copy functions. */
9601 args = FUNCTION_FIRST_USER_PARMTYPE (d);
9605 arg_type = TREE_VALUE (args);
9606 if (arg_type == error_mark_node)
9609 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
9611 /* Pass by value copy assignment operator. */
9614 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
9615 && !TYPE_REF_IS_RVALUE (arg_type)
9616 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
9618 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
9624 args = TREE_CHAIN (args);
9626 if (args && args != void_list_node && !TREE_PURPOSE (args))
9627 /* There are more non-optional args. */
9633 /* D is a constructor or overloaded `operator='.
9635 Let T be the class in which D is declared. Then, this function
9636 returns true when D is a move constructor or move assignment
9637 operator, false otherwise. */
9640 move_fn_p (const_tree d)
9644 bool result = false;
9646 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
9648 if (cxx_dialect == cxx98)
9649 /* There are no move constructors if we are in C++98 mode. */
9652 if (TREE_CODE (d) == TEMPLATE_DECL
9653 || (DECL_TEMPLATE_INFO (d)
9654 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
9655 /* Instantiations of template member functions are never copy
9656 functions. Note that member functions of templated classes are
9657 represented as template functions internally, and we must
9658 accept those as copy functions. */
9661 args = FUNCTION_FIRST_USER_PARMTYPE (d);
9665 arg_type = TREE_VALUE (args);
9666 if (arg_type == error_mark_node)
9669 if (TREE_CODE (arg_type) == REFERENCE_TYPE
9670 && TYPE_REF_IS_RVALUE (arg_type)
9671 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
9675 args = TREE_CHAIN (args);
9677 if (args && args != void_list_node && !TREE_PURPOSE (args))
9678 /* There are more non-optional args. */
9684 /* Remember any special properties of member function DECL. */
9687 grok_special_member_properties (tree decl)
9691 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
9694 class_type = DECL_CONTEXT (decl);
9695 if (DECL_CONSTRUCTOR_P (decl))
9697 int ctor = copy_fn_p (decl);
9699 if (!DECL_ARTIFICIAL (decl))
9700 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
9706 A non-template constructor for class X is a copy
9707 constructor if its first parameter is of type X&, const
9708 X&, volatile X& or const volatile X&, and either there
9709 are no other parameters or else all other parameters have
9710 default arguments. */
9711 TYPE_HAS_INIT_REF (class_type) = 1;
9712 if (!DECL_DEFAULTED_FN (decl))
9713 TYPE_HAS_COMPLEX_INIT_REF (class_type) = 1;
9715 TYPE_HAS_CONST_INIT_REF (class_type) = 1;
9717 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
9718 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
9719 else if (is_list_ctor (decl))
9720 TYPE_HAS_LIST_CTOR (class_type) = 1;
9722 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
9726 A non-template assignment operator for class X is a copy
9727 assignment operator if its parameter is of type X, X&, const
9728 X&, volatile X& or const volatile X&. */
9730 int assop = copy_fn_p (decl);
9734 TYPE_HAS_ASSIGN_REF (class_type) = 1;
9735 if (!DECL_DEFAULTED_FN (decl))
9736 TYPE_HAS_COMPLEX_ASSIGN_REF (class_type) = 1;
9738 TYPE_HAS_CONST_ASSIGN_REF (class_type) = 1;
9743 /* Check a constructor DECL has the correct form. Complains
9744 if the class has a constructor of the form X(X). */
9747 grok_ctor_properties (const_tree ctype, const_tree decl)
9749 int ctor_parm = copy_fn_p (decl);
9755 A declaration of a constructor for a class X is ill-formed if
9756 its first parameter is of type (optionally cv-qualified) X
9757 and either there are no other parameters or else all other
9758 parameters have default arguments.
9760 We *don't* complain about member template instantiations that
9761 have this form, though; they can occur as we try to decide
9762 what constructor to use during overload resolution. Since
9763 overload resolution will never prefer such a constructor to
9764 the non-template copy constructor (which is either explicitly
9765 or implicitly defined), there's no need to worry about their
9766 existence. Theoretically, they should never even be
9767 instantiated, but that's hard to forestall. */
9768 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
9776 /* An operator with this code is unary, but can also be binary. */
9779 ambi_op_p (enum tree_code code)
9781 return (code == INDIRECT_REF
9782 || code == ADDR_EXPR
9783 || code == UNARY_PLUS_EXPR
9784 || code == NEGATE_EXPR
9785 || code == PREINCREMENT_EXPR
9786 || code == PREDECREMENT_EXPR);
9789 /* An operator with this name can only be unary. */
9792 unary_op_p (enum tree_code code)
9794 return (code == TRUTH_NOT_EXPR
9795 || code == BIT_NOT_EXPR
9796 || code == COMPONENT_REF
9797 || code == TYPE_EXPR);
9800 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
9801 errors are issued for invalid declarations. */
9804 grok_op_properties (tree decl, bool complain)
9806 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
9808 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
9809 tree name = DECL_NAME (decl);
9810 enum tree_code operator_code;
9815 /* Count the number of arguments and check for ellipsis. */
9816 for (argtype = argtypes, arity = 0;
9817 argtype && argtype != void_list_node;
9818 argtype = TREE_CHAIN (argtype))
9820 ellipsis_p = !argtype;
9822 class_type = DECL_CONTEXT (decl);
9823 if (class_type && !CLASS_TYPE_P (class_type))
9824 class_type = NULL_TREE;
9826 if (DECL_CONV_FN_P (decl))
9827 operator_code = TYPE_EXPR;
9831 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
9832 if (ansi_opname (CODE) == name) \
9834 operator_code = (CODE); \
9837 else if (ansi_assopname (CODE) == name) \
9839 operator_code = (CODE); \
9840 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
9844 #include "operators.def"
9850 gcc_assert (operator_code != MAX_TREE_CODES);
9851 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
9854 switch (operator_code)
9857 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
9861 TYPE_GETS_DELETE (class_type) |= 1;
9865 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
9868 case VEC_DELETE_EXPR:
9869 TYPE_GETS_DELETE (class_type) |= 2;
9876 /* [basic.std.dynamic.allocation]/1:
9878 A program is ill-formed if an allocation function is declared
9879 in a namespace scope other than global scope or declared static
9882 The same also holds true for deallocation functions. */
9883 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
9884 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
9886 if (DECL_NAMESPACE_SCOPE_P (decl))
9888 if (CP_DECL_CONTEXT (decl) != global_namespace)
9890 error ("%qD may not be declared within a namespace", decl);
9893 else if (!TREE_PUBLIC (decl))
9895 error ("%qD may not be declared as static", decl);
9901 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
9903 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
9904 DECL_IS_OPERATOR_NEW (decl) = 1;
9906 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
9907 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
9910 /* An operator function must either be a non-static member function
9911 or have at least one parameter of a class, a reference to a class,
9912 an enumeration, or a reference to an enumeration. 13.4.0.6 */
9913 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
9915 if (operator_code == TYPE_EXPR
9916 || operator_code == CALL_EXPR
9917 || operator_code == COMPONENT_REF
9918 || operator_code == ARRAY_REF
9919 || operator_code == NOP_EXPR)
9921 error ("%qD must be a nonstatic member function", decl);
9928 if (DECL_STATIC_FUNCTION_P (decl))
9930 error ("%qD must be either a non-static member "
9931 "function or a non-member function", decl);
9935 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
9937 tree arg = non_reference (TREE_VALUE (p));
9938 if (arg == error_mark_node)
9941 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
9942 because these checks are performed even on
9943 template functions. */
9944 if (MAYBE_CLASS_TYPE_P (arg)
9945 || TREE_CODE (arg) == ENUMERAL_TYPE)
9949 if (!p || p == void_list_node)
9952 error ("%qD must have an argument of class or "
9953 "enumerated type", decl);
9959 /* There are no restrictions on the arguments to an overloaded
9961 if (operator_code == CALL_EXPR)
9964 /* Warn about conversion operators that will never be used. */
9965 if (IDENTIFIER_TYPENAME_P (name)
9966 && ! DECL_TEMPLATE_INFO (decl)
9968 /* Warn only declaring the function; there is no need to
9969 warn again about out-of-class definitions. */
9970 && class_type == current_class_type)
9972 tree t = TREE_TYPE (name);
9973 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
9974 const char *what = 0;
9977 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
9979 if (TREE_CODE (t) == VOID_TYPE)
9981 else if (class_type)
9983 if (t == class_type)
9984 what = "the same type";
9985 /* Don't force t to be complete here. */
9986 else if (MAYBE_CLASS_TYPE_P (t)
9987 && COMPLETE_TYPE_P (t)
9988 && DERIVED_FROM_P (t, class_type))
9989 what = "a base class";
9993 warning (OPT_Wconversion, "conversion to %s%s will never use a type "
9994 "conversion operator",
9995 ref ? "a reference to " : "", what);
9998 if (operator_code == COND_EXPR)
10001 error ("ISO C++ prohibits overloading operator ?:");
10004 else if (ellipsis_p)
10006 error ("%qD must not have variable number of arguments", decl);
10009 else if (ambi_op_p (operator_code))
10012 /* We pick the one-argument operator codes by default, so
10013 we don't have to change anything. */
10015 else if (arity == 2)
10017 /* If we thought this was a unary operator, we now know
10018 it to be a binary operator. */
10019 switch (operator_code)
10022 operator_code = MULT_EXPR;
10026 operator_code = BIT_AND_EXPR;
10029 case UNARY_PLUS_EXPR:
10030 operator_code = PLUS_EXPR;
10034 operator_code = MINUS_EXPR;
10037 case PREINCREMENT_EXPR:
10038 operator_code = POSTINCREMENT_EXPR;
10041 case PREDECREMENT_EXPR:
10042 operator_code = POSTDECREMENT_EXPR;
10046 gcc_unreachable ();
10049 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10051 if ((operator_code == POSTINCREMENT_EXPR
10052 || operator_code == POSTDECREMENT_EXPR)
10053 && ! processing_template_decl
10054 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
10057 error ("postfix %qD must take %<int%> as its argument",
10060 error ("postfix %qD must take %<int%> as its second "
10068 error ("%qD must take either zero or one argument", decl);
10070 error ("%qD must take either one or two arguments", decl);
10074 /* More Effective C++ rule 6. */
10076 && (operator_code == POSTINCREMENT_EXPR
10077 || operator_code == POSTDECREMENT_EXPR
10078 || operator_code == PREINCREMENT_EXPR
10079 || operator_code == PREDECREMENT_EXPR))
10081 tree arg = TREE_VALUE (argtypes);
10082 tree ret = TREE_TYPE (TREE_TYPE (decl));
10083 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
10084 arg = TREE_TYPE (arg);
10085 arg = TYPE_MAIN_VARIANT (arg);
10086 if (operator_code == PREINCREMENT_EXPR
10087 || operator_code == PREDECREMENT_EXPR)
10089 if (TREE_CODE (ret) != REFERENCE_TYPE
10090 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
10092 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
10093 build_reference_type (arg));
10097 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
10098 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
10102 else if (unary_op_p (operator_code))
10107 error ("%qD must take %<void%>", decl);
10109 error ("%qD must take exactly one argument", decl);
10113 else /* if (binary_op_p (operator_code)) */
10118 error ("%qD must take exactly one argument", decl);
10120 error ("%qD must take exactly two arguments", decl);
10124 /* More Effective C++ rule 7. */
10126 && (operator_code == TRUTH_ANDIF_EXPR
10127 || operator_code == TRUTH_ORIF_EXPR
10128 || operator_code == COMPOUND_EXPR))
10129 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
10133 /* Effective C++ rule 23. */
10136 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
10137 && (operator_code == PLUS_EXPR
10138 || operator_code == MINUS_EXPR
10139 || operator_code == TRUNC_DIV_EXPR
10140 || operator_code == MULT_EXPR
10141 || operator_code == TRUNC_MOD_EXPR)
10142 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
10143 warning (OPT_Weffc__, "%qD should return by value", decl);
10145 /* [over.oper]/8 */
10146 for (; argtypes && argtypes != void_list_node;
10147 argtypes = TREE_CHAIN (argtypes))
10148 if (TREE_PURPOSE (argtypes))
10150 TREE_PURPOSE (argtypes) = NULL_TREE;
10151 if (operator_code == POSTINCREMENT_EXPR
10152 || operator_code == POSTDECREMENT_EXPR)
10154 pedwarn (input_location, OPT_pedantic, "%qD cannot have default arguments",
10159 error ("%qD cannot have default arguments", decl);
10167 /* Return a string giving the keyword associate with CODE. */
10169 static const char *
10170 tag_name (enum tag_types code)
10182 case typename_type:
10185 gcc_unreachable ();
10189 /* Name lookup in an elaborated-type-specifier (after the keyword
10190 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
10191 elaborated-type-specifier is invalid, issue a diagnostic and return
10192 error_mark_node; otherwise, return the *_TYPE to which it referred.
10193 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
10196 check_elaborated_type_specifier (enum tag_types tag_code,
10198 bool allow_template_p)
10204 struct S { struct S *p; };
10206 name lookup will find the TYPE_DECL for the implicit "S::S"
10207 typedef. Adjust for that here. */
10208 if (DECL_SELF_REFERENCE_P (decl))
10209 decl = TYPE_NAME (TREE_TYPE (decl));
10211 type = TREE_TYPE (decl);
10213 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
10214 is false for this case as well. */
10215 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
10217 error ("using template type parameter %qT after %qs",
10218 type, tag_name (tag_code));
10219 return error_mark_node;
10223 If the identifier resolves to a typedef-name or a template
10224 type-parameter, the elaborated-type-specifier is ill-formed.
10226 In other words, the only legitimate declaration to use in the
10227 elaborated type specifier is the implicit typedef created when
10228 the type is declared. */
10229 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
10230 && tag_code != typename_type)
10232 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
10233 error ("%q+D has a previous declaration here", decl);
10234 return error_mark_node;
10236 else if (TREE_CODE (type) != RECORD_TYPE
10237 && TREE_CODE (type) != UNION_TYPE
10238 && tag_code != enum_type
10239 && tag_code != typename_type)
10241 error ("%qT referred to as %qs", type, tag_name (tag_code));
10242 error ("%q+T has a previous declaration here", type);
10243 return error_mark_node;
10245 else if (TREE_CODE (type) != ENUMERAL_TYPE
10246 && tag_code == enum_type)
10248 error ("%qT referred to as enum", type);
10249 error ("%q+T has a previous declaration here", type);
10250 return error_mark_node;
10252 else if (!allow_template_p
10253 && TREE_CODE (type) == RECORD_TYPE
10254 && CLASSTYPE_IS_TEMPLATE (type))
10256 /* If a class template appears as elaborated type specifier
10257 without a template header such as:
10259 template <class T> class C {};
10260 void f(class C); // No template header here
10262 then the required template argument is missing. */
10263 error ("template argument required for %<%s %T%>",
10264 tag_name (tag_code),
10265 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
10266 return error_mark_node;
10272 /* Lookup NAME in elaborate type specifier in scope according to
10273 SCOPE and issue diagnostics if necessary.
10274 Return *_TYPE node upon success, NULL_TREE when the NAME is not
10275 found, and ERROR_MARK_NODE for type error. */
10278 lookup_and_check_tag (enum tag_types tag_code, tree name,
10279 tag_scope scope, bool template_header_p)
10283 if (scope == ts_global)
10285 /* First try ordinary name lookup, ignoring hidden class name
10286 injected via friend declaration. */
10287 decl = lookup_name_prefer_type (name, 2);
10288 /* If that fails, the name will be placed in the smallest
10289 non-class, non-function-prototype scope according to 3.3.1/5.
10290 We may already have a hidden name declared as friend in this
10291 scope. So lookup again but not ignoring hidden names.
10292 If we find one, that name will be made visible rather than
10293 creating a new tag. */
10295 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
10298 decl = lookup_type_scope (name, scope);
10300 if (decl && DECL_CLASS_TEMPLATE_P (decl))
10301 decl = DECL_TEMPLATE_RESULT (decl);
10303 if (decl && TREE_CODE (decl) == TYPE_DECL)
10305 /* Look for invalid nested type:
10309 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
10311 error ("%qD has the same name as the class in which it is "
10314 return error_mark_node;
10317 /* Two cases we need to consider when deciding if a class
10318 template is allowed as an elaborated type specifier:
10319 1. It is a self reference to its own class.
10320 2. It comes with a template header.
10324 template <class T> class C {
10325 class C *c1; // DECL_SELF_REFERENCE_P is true
10328 template <class U> class C; // template_header_p is true
10329 template <class T> class C<T>::D {
10330 class C *c2; // DECL_SELF_REFERENCE_P is true
10333 t = check_elaborated_type_specifier (tag_code,
10336 | DECL_SELF_REFERENCE_P (decl));
10339 else if (decl && TREE_CODE (decl) == TREE_LIST)
10341 error ("reference to %qD is ambiguous", name);
10342 print_candidates (decl);
10343 return error_mark_node;
10349 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
10350 Define the tag as a forward-reference if it is not defined.
10352 If a declaration is given, process it here, and report an error if
10353 multiple declarations are not identical.
10355 SCOPE is TS_CURRENT when this is also a definition. Only look in
10356 the current frame for the name (since C++ allows new names in any
10357 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
10358 declaration. Only look beginning from the current scope outward up
10359 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
10361 TEMPLATE_HEADER_P is true when this declaration is preceded by
10362 a set of template parameters. */
10365 xref_tag (enum tag_types tag_code, tree name,
10366 tag_scope scope, bool template_header_p)
10368 enum tree_code code;
10370 tree context = NULL_TREE;
10372 timevar_push (TV_NAME_LOOKUP);
10374 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
10380 code = RECORD_TYPE;
10386 code = ENUMERAL_TYPE;
10389 gcc_unreachable ();
10392 /* In case of anonymous name, xref_tag is only called to
10393 make type node and push name. Name lookup is not required. */
10394 if (ANON_AGGRNAME_P (name))
10397 t = lookup_and_check_tag (tag_code, name,
10398 scope, template_header_p);
10400 if (t == error_mark_node)
10401 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10403 if (scope != ts_current && t && current_class_type
10404 && template_class_depth (current_class_type)
10405 && template_header_p)
10407 /* Since SCOPE is not TS_CURRENT, we are not looking at a
10408 definition of this tag. Since, in addition, we are currently
10409 processing a (member) template declaration of a template
10410 class, we must be very careful; consider:
10417 { template <class V>
10418 friend struct S1; };
10420 Here, the S2::S1 declaration should not be confused with the
10421 outer declaration. In particular, the inner version should
10422 have a template parameter of level 2, not level 1. This
10423 would be particularly important if the member declaration
10426 template <class V = U> friend struct S1;
10428 say, when we should tsubst into `U' when instantiating
10429 S2. On the other hand, when presented with:
10439 we must find the inner binding eventually. We
10440 accomplish this by making sure that the new type we
10441 create to represent this declaration has the right
10443 context = TYPE_CONTEXT (t);
10449 /* If no such tag is yet defined, create a forward-reference node
10450 and record it as the "definition".
10451 When a real declaration of this type is found,
10452 the forward-reference will be altered into a real type. */
10453 if (code == ENUMERAL_TYPE)
10455 error ("use of enum %q#D without previous declaration", name);
10456 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10460 t = make_class_type (code);
10461 TYPE_CONTEXT (t) = context;
10462 t = pushtag (name, t, scope);
10467 if (template_header_p && MAYBE_CLASS_TYPE_P (t))
10469 if (!redeclare_class_template (t, current_template_parms))
10470 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10472 else if (!processing_template_decl
10473 && CLASS_TYPE_P (t)
10474 && CLASSTYPE_IS_TEMPLATE (t))
10476 error ("redeclaration of %qT as a non-template", t);
10477 error ("previous declaration %q+D", t);
10478 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10481 /* Make injected friend class visible. */
10482 if (scope != ts_within_enclosing_non_class
10483 && hidden_name_p (TYPE_NAME (t)))
10485 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
10486 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
10488 if (TYPE_TEMPLATE_INFO (t))
10490 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
10491 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
10496 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t);
10500 xref_tag_from_type (tree old, tree id, tag_scope scope)
10502 enum tag_types tag_kind;
10504 if (TREE_CODE (old) == RECORD_TYPE)
10505 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
10507 tag_kind = union_type;
10509 if (id == NULL_TREE)
10510 id = TYPE_IDENTIFIER (old);
10512 return xref_tag (tag_kind, id, scope, false);
10515 /* Create the binfo hierarchy for REF with (possibly NULL) base list
10516 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
10517 access_* node, and the TREE_VALUE is the type of the base-class.
10518 Non-NULL TREE_TYPE indicates virtual inheritance.
10520 Returns true if the binfo hierarchy was successfully created,
10521 false if an error was detected. */
10524 xref_basetypes (tree ref, tree base_list)
10527 tree binfo, base_binfo;
10528 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
10529 unsigned max_bases = 0; /* Maximum direct bases. */
10531 tree default_access;
10532 tree igo_prev; /* Track Inheritance Graph Order. */
10534 if (ref == error_mark_node)
10537 /* The base of a derived class is private by default, all others are
10539 default_access = (TREE_CODE (ref) == RECORD_TYPE
10540 && CLASSTYPE_DECLARED_CLASS (ref)
10541 ? access_private_node : access_public_node);
10543 /* First, make sure that any templates in base-classes are
10544 instantiated. This ensures that if we call ourselves recursively
10545 we do not get confused about which classes are marked and which
10547 basep = &base_list;
10550 tree basetype = TREE_VALUE (*basep);
10552 if (!(processing_template_decl && uses_template_parms (basetype))
10553 && !complete_type_or_else (basetype, NULL))
10554 /* An incomplete type. Remove it from the list. */
10555 *basep = TREE_CHAIN (*basep);
10559 if (TREE_TYPE (*basep))
10561 if (CLASS_TYPE_P (basetype))
10562 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
10563 basep = &TREE_CHAIN (*basep);
10567 TYPE_MARKED_P (ref) = 1;
10569 /* The binfo slot should be empty, unless this is an (ill-formed)
10571 gcc_assert (!TYPE_BINFO (ref) || TYPE_SIZE (ref));
10572 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
10574 binfo = make_tree_binfo (max_bases);
10576 TYPE_BINFO (ref) = binfo;
10577 BINFO_OFFSET (binfo) = size_zero_node;
10578 BINFO_TYPE (binfo) = ref;
10582 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
10583 /* An aggregate cannot have baseclasses. */
10584 CLASSTYPE_NON_AGGREGATE (ref) = 1;
10586 if (TREE_CODE (ref) == UNION_TYPE)
10588 error ("derived union %qT invalid", ref);
10595 if (TYPE_FOR_JAVA (ref))
10597 error ("Java class %qT cannot have multiple bases", ref);
10604 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
10606 if (TYPE_FOR_JAVA (ref))
10608 error ("Java class %qT cannot have virtual bases", ref);
10613 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
10615 tree access = TREE_PURPOSE (base_list);
10616 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
10617 tree basetype = TREE_VALUE (base_list);
10619 if (access == access_default_node)
10620 access = default_access;
10622 if (PACK_EXPANSION_P (basetype))
10623 basetype = PACK_EXPANSION_PATTERN (basetype);
10624 if (TREE_CODE (basetype) == TYPE_DECL)
10625 basetype = TREE_TYPE (basetype);
10626 if (!MAYBE_CLASS_TYPE_P (basetype) || TREE_CODE (basetype) == UNION_TYPE)
10628 error ("base type %qT fails to be a struct or class type",
10633 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
10634 TYPE_FOR_JAVA (ref) = 1;
10636 base_binfo = NULL_TREE;
10637 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
10639 base_binfo = TYPE_BINFO (basetype);
10640 /* The original basetype could have been a typedef'd type. */
10641 basetype = BINFO_TYPE (base_binfo);
10643 /* Inherit flags from the base. */
10644 TYPE_HAS_NEW_OPERATOR (ref)
10645 |= TYPE_HAS_NEW_OPERATOR (basetype);
10646 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
10647 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
10648 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
10649 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
10650 CLASSTYPE_DIAMOND_SHAPED_P (ref)
10651 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
10652 CLASSTYPE_REPEATED_BASE_P (ref)
10653 |= CLASSTYPE_REPEATED_BASE_P (basetype);
10656 /* We must do this test after we've seen through a typedef
10658 if (TYPE_MARKED_P (basetype))
10660 if (basetype == ref)
10661 error ("recursive type %qT undefined", basetype);
10663 error ("duplicate base type %qT invalid", basetype);
10667 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
10668 /* Regenerate the pack expansion for the bases. */
10669 basetype = make_pack_expansion (basetype);
10671 TYPE_MARKED_P (basetype) = 1;
10673 base_binfo = copy_binfo (base_binfo, basetype, ref,
10674 &igo_prev, via_virtual);
10675 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
10676 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
10678 BINFO_BASE_APPEND (binfo, base_binfo);
10679 BINFO_BASE_ACCESS_APPEND (binfo, access);
10682 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
10683 /* If we have space in the vbase vector, we must have shared at
10684 least one of them, and are therefore diamond shaped. */
10685 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
10687 /* Unmark all the types. */
10688 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
10689 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
10690 TYPE_MARKED_P (ref) = 0;
10692 /* Now see if we have a repeated base type. */
10693 if (!CLASSTYPE_REPEATED_BASE_P (ref))
10695 for (base_binfo = binfo; base_binfo;
10696 base_binfo = TREE_CHAIN (base_binfo))
10698 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
10700 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
10703 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
10705 for (base_binfo = binfo; base_binfo;
10706 base_binfo = TREE_CHAIN (base_binfo))
10707 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
10708 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
10717 /* Begin compiling the definition of an enumeration type.
10720 UNDERLYING_TYPE is the type that will be used as the storage for
10721 the enumeration type. This should be NULL_TREE if no storage type
10724 SCOPED_ENUM_P is true if this is a scoped enumeration type.
10726 Returns the type object, as yet incomplete.
10727 Also records info about it so that build_enumerator
10728 may be used to declare the individual values as they are read. */
10731 start_enum (tree name, tree underlying_type, bool scoped_enum_p)
10735 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
10737 /* If this is the real definition for a previous forward reference,
10738 fill in the contents in the same object that used to be the
10739 forward reference. */
10741 enumtype = lookup_and_check_tag (enum_type, name,
10742 /*tag_scope=*/ts_current,
10743 /*template_header_p=*/false);
10745 if (enumtype != NULL_TREE && TREE_CODE (enumtype) == ENUMERAL_TYPE)
10747 error ("multiple definition of %q#T", enumtype);
10748 error ("%Jprevious definition here", TYPE_MAIN_DECL (enumtype));
10749 /* Clear out TYPE_VALUES, and start again. */
10750 TYPE_VALUES (enumtype) = NULL_TREE;
10754 /* In case of error, make a dummy enum to allow parsing to
10756 if (enumtype == error_mark_node)
10757 name = make_anon_name ();
10759 enumtype = make_node (ENUMERAL_TYPE);
10760 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
10765 SET_SCOPED_ENUM_P (enumtype, 1);
10766 begin_scope (sk_scoped_enum, enumtype);
10768 /* [C++0x dcl.enum]p5:
10770 If not explicitly specified, the underlying type of a scoped
10771 enumeration type is int. */
10772 if (!underlying_type)
10773 underlying_type = integer_type_node;
10776 if (underlying_type)
10778 if (CP_INTEGRAL_TYPE_P (underlying_type))
10780 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (underlying_type);
10781 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (underlying_type);
10782 TYPE_SIZE (enumtype) = TYPE_SIZE (underlying_type);
10783 TYPE_SIZE_UNIT (enumtype) = TYPE_SIZE_UNIT (underlying_type);
10784 TYPE_MODE (enumtype) = TYPE_MODE (underlying_type);
10785 TYPE_PRECISION (enumtype) = TYPE_PRECISION (underlying_type);
10786 TYPE_ALIGN (enumtype) = TYPE_ALIGN (underlying_type);
10787 TYPE_USER_ALIGN (enumtype) = TYPE_USER_ALIGN (underlying_type);
10788 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (underlying_type);
10789 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
10792 error ("underlying type %<%T%> of %<%T%> must be an integral type",
10793 underlying_type, enumtype);
10799 /* After processing and defining all the values of an enumeration type,
10800 install their decls in the enumeration type and finish it off.
10801 ENUMTYPE is the type object and VALUES a list of name-value pairs. */
10804 finish_enum (tree enumtype)
10813 bool use_short_enum;
10817 integer_type_kind itk;
10818 tree underlying_type = NULL_TREE;
10819 bool fixed_underlying_type_p
10820 = ENUM_UNDERLYING_TYPE (enumtype) != NULL_TREE;
10822 /* We built up the VALUES in reverse order. */
10823 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
10825 /* For an enum defined in a template, just set the type of the values;
10826 all further processing is postponed until the template is
10827 instantiated. We need to set the type so that tsubst of a CONST_DECL
10829 if (processing_template_decl)
10831 for (values = TYPE_VALUES (enumtype);
10833 values = TREE_CHAIN (values))
10834 TREE_TYPE (TREE_VALUE (values)) = enumtype;
10835 if (at_function_scope_p ())
10836 add_stmt (build_min (TAG_DEFN, enumtype));
10840 /* Determine the minimum and maximum values of the enumerators. */
10841 if (TYPE_VALUES (enumtype))
10843 minnode = maxnode = NULL_TREE;
10845 for (values = TYPE_VALUES (enumtype);
10847 values = TREE_CHAIN (values))
10849 decl = TREE_VALUE (values);
10851 /* [dcl.enum]: Following the closing brace of an enum-specifier,
10852 each enumerator has the type of its enumeration. Prior to the
10853 closing brace, the type of each enumerator is the type of its
10854 initializing value. */
10855 TREE_TYPE (decl) = enumtype;
10857 /* Update the minimum and maximum values, if appropriate. */
10858 value = DECL_INITIAL (decl);
10859 if (value == error_mark_node)
10860 value = integer_zero_node;
10861 /* Figure out what the minimum and maximum values of the
10862 enumerators are. */
10864 minnode = maxnode = value;
10865 else if (tree_int_cst_lt (maxnode, value))
10867 else if (tree_int_cst_lt (value, minnode))
10874 If the enumerator-list is empty, the underlying type is as if
10875 the enumeration had a single enumerator with value 0. */
10876 minnode = maxnode = integer_zero_node;
10878 /* Compute the number of bits require to represent all values of the
10879 enumeration. We must do this before the type of MINNODE and
10880 MAXNODE are transformed, since min_precision relies on the
10881 TREE_TYPE of the value it is passed. */
10882 unsignedp = tree_int_cst_sgn (minnode) >= 0;
10883 lowprec = min_precision (minnode, unsignedp);
10884 highprec = min_precision (maxnode, unsignedp);
10885 precision = MAX (lowprec, highprec);
10887 if (!fixed_underlying_type_p)
10889 /* Determine the underlying type of the enumeration.
10893 The underlying type of an enumeration is an integral type that
10894 can represent all the enumerator values defined in the
10895 enumeration. It is implementation-defined which integral type is
10896 used as the underlying type for an enumeration except that the
10897 underlying type shall not be larger than int unless the value of
10898 an enumerator cannot fit in an int or unsigned int.
10900 We use "int" or an "unsigned int" as the underlying type, even if
10901 a smaller integral type would work, unless the user has
10902 explicitly requested that we use the smallest possible type. The
10903 user can request that for all enumerations with a command line
10904 flag, or for just one enumeration with an attribute. */
10906 use_short_enum = flag_short_enums
10907 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
10909 for (itk = (use_short_enum ? itk_char : itk_int);
10913 underlying_type = integer_types[itk];
10914 if (TYPE_PRECISION (underlying_type) >= precision
10915 && TYPE_UNSIGNED (underlying_type) == unsignedp)
10918 if (itk == itk_none)
10922 IF no integral type can represent all the enumerator values, the
10923 enumeration is ill-formed. */
10924 error ("no integral type can represent all of the enumerator values "
10925 "for %qT", enumtype);
10926 precision = TYPE_PRECISION (long_long_integer_type_node);
10927 underlying_type = integer_types[itk_unsigned_long_long];
10932 The value of sizeof() applied to an enumeration type, an object
10933 of an enumeration type, or an enumerator, is the value of sizeof()
10934 applied to the underlying type. */
10935 TYPE_SIZE (enumtype) = TYPE_SIZE (underlying_type);
10936 TYPE_SIZE_UNIT (enumtype) = TYPE_SIZE_UNIT (underlying_type);
10937 TYPE_MODE (enumtype) = TYPE_MODE (underlying_type);
10938 TYPE_ALIGN (enumtype) = TYPE_ALIGN (underlying_type);
10939 TYPE_USER_ALIGN (enumtype) = TYPE_USER_ALIGN (underlying_type);
10940 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (underlying_type);
10942 /* Set the underlying type of the enumeration type to the
10943 computed enumeration type, restricted to the enumerator
10945 ENUM_UNDERLYING_TYPE (enumtype) = copy_node (underlying_type);
10946 set_min_and_max_values_for_integral_type
10947 (ENUM_UNDERLYING_TYPE (enumtype), precision, unsignedp);
10950 underlying_type = ENUM_UNDERLYING_TYPE (enumtype);
10952 /* Compute the minimum and maximum values for the type.
10956 For an enumeration where emin is the smallest enumerator and emax
10957 is the largest, the values of the enumeration are the values of the
10958 underlying type in the range bmin to bmax, where bmin and bmax are,
10959 respectively, the smallest and largest values of the smallest bit-
10960 field that can store emin and emax. */
10962 /* The middle-end currently assumes that types with TYPE_PRECISION
10963 narrower than their underlying type are suitably zero or sign
10964 extended to fill their mode. g++ doesn't make these guarantees.
10965 Until the middle-end can represent such paradoxical types, we
10966 set the TYPE_PRECISION to the width of the underlying type. */
10967 TYPE_PRECISION (enumtype) = TYPE_PRECISION (underlying_type);
10969 set_min_and_max_values_for_integral_type (enumtype, precision, unsignedp);
10971 /* Convert each of the enumerators to the type of the underlying
10972 type of the enumeration. */
10973 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
10975 location_t saved_location;
10977 decl = TREE_VALUE (values);
10978 saved_location = input_location;
10979 input_location = DECL_SOURCE_LOCATION (decl);
10980 if (fixed_underlying_type_p)
10981 /* If the enumeration type has a fixed underlying type, we
10982 already checked all of the enumerator values. */
10983 value = DECL_INITIAL (decl);
10985 value = perform_implicit_conversion (underlying_type,
10986 DECL_INITIAL (decl),
10987 tf_warning_or_error);
10988 input_location = saved_location;
10990 /* Do not clobber shared ints. */
10991 value = copy_node (value);
10993 TREE_TYPE (value) = enumtype;
10994 DECL_INITIAL (decl) = value;
10997 /* Fix up all variant types of this enum type. */
10998 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
11000 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
11001 TYPE_MIN_VALUE (t) = TYPE_MIN_VALUE (enumtype);
11002 TYPE_MAX_VALUE (t) = TYPE_MAX_VALUE (enumtype);
11003 TYPE_SIZE (t) = TYPE_SIZE (enumtype);
11004 TYPE_SIZE_UNIT (t) = TYPE_SIZE_UNIT (enumtype);
11005 TYPE_MODE (t) = TYPE_MODE (enumtype);
11006 TYPE_PRECISION (t) = TYPE_PRECISION (enumtype);
11007 TYPE_ALIGN (t) = TYPE_ALIGN (enumtype);
11008 TYPE_USER_ALIGN (t) = TYPE_USER_ALIGN (enumtype);
11009 TYPE_UNSIGNED (t) = TYPE_UNSIGNED (enumtype);
11010 ENUM_UNDERLYING_TYPE (t) = ENUM_UNDERLYING_TYPE (enumtype);
11013 /* Finish up the scope of a scoped enumeration. */
11014 if (SCOPED_ENUM_P (enumtype))
11017 /* Finish debugging output for this type. */
11018 rest_of_type_compilation (enumtype, namespace_bindings_p ());
11021 /* Build and install a CONST_DECL for an enumeration constant of the
11022 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
11023 Assignment of sequential values by default is handled here. */
11026 build_enumerator (tree name, tree value, tree enumtype)
11032 /* If the VALUE was erroneous, pretend it wasn't there; that will
11033 result in the enum being assigned the next value in sequence. */
11034 if (value == error_mark_node)
11037 /* Remove no-op casts from the value. */
11039 STRIP_TYPE_NOPS (value);
11041 if (! processing_template_decl)
11043 /* Validate and default VALUE. */
11044 if (value != NULL_TREE)
11046 value = integral_constant_value (value);
11048 if (TREE_CODE (value) == INTEGER_CST)
11050 value = perform_integral_promotions (value);
11051 constant_expression_warning (value);
11055 error ("enumerator value for %qD is not an integer constant", name);
11060 /* Default based on previous value. */
11061 if (value == NULL_TREE)
11063 if (TYPE_VALUES (enumtype))
11066 unsigned HOST_WIDE_INT lo;
11070 /* The next value is the previous value plus one. We can
11071 safely assume that the previous value is an INTEGER_CST.
11072 add_double doesn't know the type of the target expression,
11073 so we must check with int_fits_type_p as well. */
11074 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
11075 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
11076 TREE_INT_CST_HIGH (prev_value),
11078 value = build_int_cst_wide (TREE_TYPE (prev_value), lo, hi);
11079 overflowed |= !int_fits_type_p (value, TREE_TYPE (prev_value));
11083 error ("overflow in enumeration values at %qD", name);
11084 value = error_mark_node;
11088 value = integer_zero_node;
11091 /* Remove no-op casts from the value. */
11092 STRIP_TYPE_NOPS (value);
11094 /* If the underlying type of the enum is fixed, check whether
11095 the enumerator values fits in the underlying type. If it
11096 does not fit, the program is ill-formed [C++0x dcl.enum]. */
11097 if (ENUM_UNDERLYING_TYPE (enumtype)
11099 && TREE_CODE (value) == INTEGER_CST
11100 && !int_fits_type_p (value, ENUM_UNDERLYING_TYPE (enumtype)))
11102 error ("enumerator value %E is too large for underlying type %<%T%>",
11103 value, ENUM_UNDERLYING_TYPE (enumtype));
11105 /* Silently convert the value so that we can continue. */
11106 value = perform_implicit_conversion (ENUM_UNDERLYING_TYPE (enumtype),
11108 if (value == error_mark_node)
11113 /* C++ associates enums with global, function, or class declarations. */
11114 context = current_scope ();
11116 /* Build the actual enumeration constant. Note that the enumeration
11117 constants have the underlying type of the enum (if it is fixed)
11118 or the type of their initializer (if the underlying type of the
11119 enum is not fixed):
11123 If the underlying type is fixed, the type of each enumerator
11124 prior to the closing brace is the underlying type; if the
11125 initializing value of an enumerator cannot be represented by
11126 the underlying type, the program is ill-formed. If the
11127 underlying type is not fixed, the type of each enumerator is
11128 the type of its initializing value.
11130 If the underlying type is not fixed, it will be computed by
11131 finish_enum and we will reset the type of this enumerator. Of
11132 course, if we're processing a template, there may be no value. */
11133 type = value ? TREE_TYPE (value) : NULL_TREE;
11135 if (context && context == current_class_type)
11136 /* This enum declaration is local to the class. We need the full
11137 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
11138 decl = build_lang_decl (CONST_DECL, name, type);
11140 /* It's a global enum, or it's local to a function. (Note local to
11141 a function could mean local to a class method. */
11142 decl = build_decl (CONST_DECL, name, type);
11144 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
11145 TREE_CONSTANT (decl) = 1;
11146 TREE_READONLY (decl) = 1;
11147 DECL_INITIAL (decl) = value;
11149 if (context && context == current_class_type)
11150 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
11151 on the TYPE_FIELDS list for `S'. (That's so that you can say
11152 things like `S::i' later.) */
11153 finish_member_declaration (decl);
11157 /* Add this enumeration constant to the list for this type. */
11158 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
11161 /* Look for an enumerator with the given NAME within the enumeration
11162 type ENUMTYPE. This routine is used primarily for qualified name
11163 lookup into an enumerator in C++0x, e.g.,
11165 enum class Color { Red, Green, Blue };
11167 Color color = Color::Red;
11169 Returns the value corresponding to the enumerator, or
11170 NULL_TREE if no such enumerator was found. */
11172 lookup_enumerator (tree enumtype, tree name)
11175 gcc_assert (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE);
11177 e = purpose_member (name, TYPE_VALUES (enumtype));
11178 return e? TREE_VALUE (e) : NULL_TREE;
11182 /* We're defining DECL. Make sure that it's type is OK. */
11185 check_function_type (tree decl, tree current_function_parms)
11187 tree fntype = TREE_TYPE (decl);
11188 tree return_type = complete_type (TREE_TYPE (fntype));
11190 /* In a function definition, arg types must be complete. */
11191 require_complete_types_for_parms (current_function_parms);
11193 if (dependent_type_p (return_type))
11195 if (!COMPLETE_OR_VOID_TYPE_P (return_type)
11196 || (TYPE_FOR_JAVA (return_type) && MAYBE_CLASS_TYPE_P (return_type)))
11198 tree args = TYPE_ARG_TYPES (fntype);
11200 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
11201 error ("return type %q#T is incomplete", return_type);
11203 error ("return type has Java class type %q#T", return_type);
11205 /* Make it return void instead. */
11206 if (TREE_CODE (fntype) == METHOD_TYPE)
11207 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
11209 TREE_CHAIN (args));
11211 fntype = build_function_type (void_type_node, args);
11213 = build_exception_variant (fntype,
11214 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
11217 abstract_virtuals_error (decl, TREE_TYPE (fntype));
11220 /* Create the FUNCTION_DECL for a function definition.
11221 DECLSPECS and DECLARATOR are the parts of the declaration;
11222 they describe the function's name and the type it returns,
11223 but twisted together in a fashion that parallels the syntax of C.
11225 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
11226 DECLARATOR is really the DECL for the function we are about to
11227 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
11228 indicating that the function is an inline defined in-class.
11230 This function creates a binding context for the function body
11231 as well as setting up the FUNCTION_DECL in current_function_decl.
11233 For C++, we must first check whether that datum makes any sense.
11234 For example, "class A local_a(1,2);" means that variable local_a
11235 is an aggregate of type A, which should have a constructor
11236 applied to it with the argument list [1, 2].
11238 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
11239 or may be a BLOCK if the function has been defined previously
11240 in this translation unit. On exit, DECL_INITIAL (decl1) will be
11241 error_mark_node if the function has never been defined, or
11242 a BLOCK if the function has been defined somewhere. */
11245 start_preparsed_function (tree decl1, tree attrs, int flags)
11247 tree ctype = NULL_TREE;
11250 int doing_friend = 0;
11251 struct cp_binding_level *bl;
11252 tree current_function_parms;
11253 struct c_fileinfo *finfo
11254 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
11255 bool honor_interface;
11257 /* Sanity check. */
11258 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
11259 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
11261 fntype = TREE_TYPE (decl1);
11262 if (TREE_CODE (fntype) == METHOD_TYPE)
11263 ctype = TYPE_METHOD_BASETYPE (fntype);
11265 /* ISO C++ 11.4/5. A friend function defined in a class is in
11266 the (lexical) scope of the class in which it is defined. */
11267 if (!ctype && DECL_FRIEND_P (decl1))
11269 ctype = DECL_FRIEND_CONTEXT (decl1);
11271 /* CTYPE could be null here if we're dealing with a template;
11272 for example, `inline friend float foo()' inside a template
11273 will have no CTYPE set. */
11274 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
11280 if (DECL_DECLARED_INLINE_P (decl1)
11281 && lookup_attribute ("noinline", attrs))
11282 warning (0, "inline function %q+D given attribute noinline", decl1);
11284 /* Handle gnu_inline attribute. */
11285 if (GNU_INLINE_P (decl1))
11287 DECL_EXTERNAL (decl1) = 1;
11288 DECL_NOT_REALLY_EXTERN (decl1) = 0;
11289 DECL_INTERFACE_KNOWN (decl1) = 1;
11290 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
11293 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
11294 /* This is a constructor, we must ensure that any default args
11295 introduced by this definition are propagated to the clones
11296 now. The clones are used directly in overload resolution. */
11297 adjust_clone_args (decl1);
11299 /* Sometimes we don't notice that a function is a static member, and
11300 build a METHOD_TYPE for it. Fix that up now. */
11301 if (ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
11302 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE)
11304 revert_static_member_fn (decl1);
11308 /* Set up current_class_type, and enter the scope of the class, if
11311 push_nested_class (ctype);
11312 else if (DECL_STATIC_FUNCTION_P (decl1))
11313 push_nested_class (DECL_CONTEXT (decl1));
11315 /* Now that we have entered the scope of the class, we must restore
11316 the bindings for any template parameters surrounding DECL1, if it
11317 is an inline member template. (Order is important; consider the
11318 case where a template parameter has the same name as a field of
11319 the class.) It is not until after this point that
11320 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
11321 if (flags & SF_INCLASS_INLINE)
11322 maybe_begin_member_template_processing (decl1);
11324 /* Effective C++ rule 15. */
11326 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
11327 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
11328 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
11330 /* Make the init_value nonzero so pushdecl knows this is not tentative.
11331 error_mark_node is replaced below (in poplevel) with the BLOCK. */
11332 if (!DECL_INITIAL (decl1))
11333 DECL_INITIAL (decl1) = error_mark_node;
11335 /* This function exists in static storage.
11336 (This does not mean `static' in the C sense!) */
11337 TREE_STATIC (decl1) = 1;
11339 /* We must call push_template_decl after current_class_type is set
11340 up. (If we are processing inline definitions after exiting a
11341 class scope, current_class_type will be NULL_TREE until set above
11342 by push_nested_class.) */
11343 if (processing_template_decl)
11345 /* FIXME: Handle error_mark_node more gracefully. */
11346 tree newdecl1 = push_template_decl (decl1);
11347 if (newdecl1 != error_mark_node)
11351 /* We are now in the scope of the function being defined. */
11352 current_function_decl = decl1;
11354 /* Save the parm names or decls from this function's declarator
11355 where store_parm_decls will find them. */
11356 current_function_parms = DECL_ARGUMENTS (decl1);
11358 /* Make sure the parameter and return types are reasonable. When
11359 you declare a function, these types can be incomplete, but they
11360 must be complete when you define the function. */
11361 check_function_type (decl1, current_function_parms);
11363 /* Build the return declaration for the function. */
11364 restype = TREE_TYPE (fntype);
11365 if (DECL_RESULT (decl1) == NULL_TREE)
11369 resdecl = build_decl (RESULT_DECL, 0, TYPE_MAIN_VARIANT (restype));
11370 DECL_ARTIFICIAL (resdecl) = 1;
11371 DECL_IGNORED_P (resdecl) = 1;
11372 DECL_RESULT (decl1) = resdecl;
11374 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
11377 /* Let the user know we're compiling this function. */
11378 announce_function (decl1);
11380 /* Record the decl so that the function name is defined.
11381 If we already have a decl for this name, and it is a FUNCTION_DECL,
11382 use the old decl. */
11383 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
11385 /* A specialization is not used to guide overload resolution. */
11386 if (!DECL_FUNCTION_MEMBER_P (decl1)
11387 && !(DECL_USE_TEMPLATE (decl1) &&
11388 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
11390 tree olddecl = pushdecl (decl1);
11392 if (olddecl == error_mark_node)
11393 /* If something went wrong when registering the declaration,
11394 use DECL1; we have to have a FUNCTION_DECL to use when
11395 parsing the body of the function. */
11399 /* Otherwise, OLDDECL is either a previous declaration
11400 of the same function or DECL1 itself. */
11402 if (warn_missing_declarations
11403 && olddecl == decl1
11404 && !DECL_MAIN_P (decl1)
11405 && TREE_PUBLIC (decl1)
11406 && !DECL_DECLARED_INLINE_P (decl1))
11410 /* Check whether DECL1 is in an anonymous
11412 for (context = DECL_CONTEXT (decl1);
11414 context = DECL_CONTEXT (context))
11416 if (TREE_CODE (context) == NAMESPACE_DECL
11417 && DECL_NAME (context) == NULL_TREE)
11421 if (context == NULL)
11422 warning (OPT_Wmissing_declarations,
11423 "no previous declaration for %q+D", decl1);
11431 /* We need to set the DECL_CONTEXT. */
11432 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
11433 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
11435 fntype = TREE_TYPE (decl1);
11437 /* If #pragma weak applies, mark the decl appropriately now.
11438 The pragma only applies to global functions. Because
11439 determining whether or not the #pragma applies involves
11440 computing the mangled name for the declaration, we cannot
11441 apply the pragma until after we have merged this declaration
11442 with any previous declarations; if the original declaration
11443 has a linkage specification, that specification applies to
11444 the definition as well, and may affect the mangled name. */
11445 if (!DECL_CONTEXT (decl1))
11446 maybe_apply_pragma_weak (decl1);
11449 /* Reset this in case the call to pushdecl changed it. */
11450 current_function_decl = decl1;
11452 gcc_assert (DECL_INITIAL (decl1));
11454 /* This function may already have been parsed, in which case just
11455 return; our caller will skip over the body without parsing. */
11456 if (DECL_INITIAL (decl1) != error_mark_node)
11459 /* Initialize RTL machinery. We cannot do this until
11460 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
11461 even when processing a template; this is how we get
11462 CFUN set up, and our per-function variables initialized.
11463 FIXME factor out the non-RTL stuff. */
11464 bl = current_binding_level;
11465 allocate_struct_function (decl1, processing_template_decl);
11467 /* Initialize the language data structures. Whenever we start
11468 a new function, we destroy temporaries in the usual way. */
11469 cfun->language = GGC_CNEW (struct language_function);
11470 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
11471 current_binding_level = bl;
11473 /* Even though we're inside a function body, we still don't want to
11474 call expand_expr to calculate the size of a variable-sized array.
11475 We haven't necessarily assigned RTL to all variables yet, so it's
11476 not safe to try to expand expressions involving them. */
11477 cfun->dont_save_pending_sizes_p = 1;
11479 /* Start the statement-tree, start the tree now. */
11480 DECL_SAVED_TREE (decl1) = push_stmt_list ();
11482 /* If we are (erroneously) defining a function that we have already
11483 defined before, wipe out what we knew before. */
11484 if (!DECL_PENDING_INLINE_P (decl1))
11485 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
11487 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
11489 /* We know that this was set up by `grokclassfn'. We do not
11490 wait until `store_parm_decls', since evil parse errors may
11491 never get us to that point. Here we keep the consistency
11492 between `current_class_type' and `current_class_ptr'. */
11493 tree t = DECL_ARGUMENTS (decl1);
11495 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
11496 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
11498 cp_function_chain->x_current_class_ref
11499 = cp_build_indirect_ref (t, NULL, tf_warning_or_error);
11500 cp_function_chain->x_current_class_ptr = t;
11502 /* Constructors and destructors need to know whether they're "in
11503 charge" of initializing virtual base classes. */
11504 t = TREE_CHAIN (t);
11505 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
11507 current_in_charge_parm = t;
11508 t = TREE_CHAIN (t);
11510 if (DECL_HAS_VTT_PARM_P (decl1))
11512 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
11513 current_vtt_parm = t;
11517 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
11518 /* Implicitly-defined methods (like the
11519 destructor for a class in which no destructor
11520 is explicitly declared) must not be defined
11521 until their definition is needed. So, we
11522 ignore interface specifications for
11523 compiler-generated functions. */
11524 && !DECL_ARTIFICIAL (decl1));
11526 if (DECL_INTERFACE_KNOWN (decl1))
11528 tree ctx = decl_function_context (decl1);
11530 if (DECL_NOT_REALLY_EXTERN (decl1))
11531 DECL_EXTERNAL (decl1) = 0;
11533 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
11534 && TREE_PUBLIC (ctx))
11535 /* This is a function in a local class in an extern inline
11537 comdat_linkage (decl1);
11539 /* If this function belongs to an interface, it is public.
11540 If it belongs to someone else's interface, it is also external.
11541 This only affects inlines and template instantiations. */
11542 else if (!finfo->interface_unknown && honor_interface)
11544 if (DECL_DECLARED_INLINE_P (decl1)
11545 || DECL_TEMPLATE_INSTANTIATION (decl1)
11546 || processing_template_decl)
11548 DECL_EXTERNAL (decl1)
11549 = (finfo->interface_only
11550 || (DECL_DECLARED_INLINE_P (decl1)
11551 && ! flag_implement_inlines
11552 && !DECL_VINDEX (decl1)));
11554 /* For WIN32 we also want to put these in linkonce sections. */
11555 maybe_make_one_only (decl1);
11558 DECL_EXTERNAL (decl1) = 0;
11559 DECL_INTERFACE_KNOWN (decl1) = 1;
11560 /* If this function is in an interface implemented in this file,
11561 make sure that the back end knows to emit this function
11563 if (!DECL_EXTERNAL (decl1))
11564 mark_needed (decl1);
11566 else if (finfo->interface_unknown && finfo->interface_only
11567 && honor_interface)
11569 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
11570 interface, we will have both finfo->interface_unknown and
11571 finfo->interface_only set. In that case, we don't want to
11572 use the normal heuristics because someone will supply a
11573 #pragma implementation elsewhere, and deducing it here would
11574 produce a conflict. */
11575 comdat_linkage (decl1);
11576 DECL_EXTERNAL (decl1) = 0;
11577 DECL_INTERFACE_KNOWN (decl1) = 1;
11578 DECL_DEFER_OUTPUT (decl1) = 1;
11582 /* This is a definition, not a reference.
11583 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
11584 if (!GNU_INLINE_P (decl1))
11585 DECL_EXTERNAL (decl1) = 0;
11587 if ((DECL_DECLARED_INLINE_P (decl1)
11588 || DECL_TEMPLATE_INSTANTIATION (decl1))
11589 && ! DECL_INTERFACE_KNOWN (decl1)
11590 /* Don't try to defer nested functions for now. */
11591 && ! decl_function_context (decl1))
11592 DECL_DEFER_OUTPUT (decl1) = 1;
11594 DECL_INTERFACE_KNOWN (decl1) = 1;
11597 /* Determine the ELF visibility attribute for the function. We must not
11598 do this before calling "pushdecl", as we must allow "duplicate_decls"
11599 to merge any attributes appropriately. We also need to wait until
11601 if (!DECL_CLONED_FUNCTION_P (decl1))
11602 determine_visibility (decl1);
11604 begin_scope (sk_function_parms, decl1);
11608 if (DECL_DESTRUCTOR_P (decl1)
11609 || (DECL_CONSTRUCTOR_P (decl1)
11610 && targetm.cxx.cdtor_returns_this ()))
11612 cdtor_label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
11613 DECL_CONTEXT (cdtor_label) = current_function_decl;
11616 start_fname_decls ();
11618 store_parm_decls (current_function_parms);
11622 /* Like start_preparsed_function, except that instead of a
11623 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
11625 Returns 1 on success. If the DECLARATOR is not suitable for a function
11626 (it defines a datum instead), we return 0, which tells
11627 yyparse to report a parse error. */
11630 start_function (cp_decl_specifier_seq *declspecs,
11631 const cp_declarator *declarator,
11636 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
11637 /* If the declarator is not suitable for a function definition,
11638 cause a syntax error. */
11639 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
11642 if (DECL_MAIN_P (decl1))
11643 /* main must return int. grokfndecl should have corrected it
11644 (and issued a diagnostic) if the user got it wrong. */
11645 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
11646 integer_type_node));
11648 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
11653 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
11657 use_eh_spec_block (tree fn)
11659 return (flag_exceptions && flag_enforce_eh_specs
11660 && !processing_template_decl
11661 && TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn))
11662 /* We insert the EH_SPEC_BLOCK only in the original
11663 function; then, it is copied automatically to the
11665 && !DECL_CLONED_FUNCTION_P (fn)
11666 /* Implicitly-generated constructors and destructors have
11667 exception specifications. However, those specifications
11668 are the union of the possible exceptions specified by the
11669 constructors/destructors for bases and members, so no
11670 unallowed exception will ever reach this function. By
11671 not creating the EH_SPEC_BLOCK we save a little memory,
11672 and we avoid spurious warnings about unreachable
11674 && !DECL_ARTIFICIAL (fn));
11677 /* Store the parameter declarations into the current function declaration.
11678 This is called after parsing the parameter declarations, before
11679 digesting the body of the function.
11681 Also install to binding contour return value identifier, if any. */
11684 store_parm_decls (tree current_function_parms)
11686 tree fndecl = current_function_decl;
11689 /* This is a chain of any other decls that came in among the parm
11690 declarations. If a parm is declared with enum {foo, bar} x;
11691 then CONST_DECLs for foo and bar are put here. */
11692 tree nonparms = NULL_TREE;
11694 if (current_function_parms)
11696 /* This case is when the function was defined with an ANSI prototype.
11697 The parms already have decls, so we need not do anything here
11698 except record them as in effect
11699 and complain if any redundant old-style parm decls were written. */
11701 tree specparms = current_function_parms;
11704 /* Must clear this because it might contain TYPE_DECLs declared
11706 current_binding_level->names = NULL;
11708 /* If we're doing semantic analysis, then we'll call pushdecl
11709 for each of these. We must do them in reverse order so that
11710 they end in the correct forward order. */
11711 specparms = nreverse (specparms);
11713 for (parm = specparms; parm; parm = next)
11715 next = TREE_CHAIN (parm);
11716 if (TREE_CODE (parm) == PARM_DECL)
11718 if (DECL_NAME (parm) == NULL_TREE
11719 || TREE_CODE (parm) != VOID_TYPE)
11722 error ("parameter %qD declared void", parm);
11726 /* If we find an enum constant or a type tag,
11727 put it aside for the moment. */
11728 TREE_CHAIN (parm) = NULL_TREE;
11729 nonparms = chainon (nonparms, parm);
11733 /* Get the decls in their original chain order and record in the
11734 function. This is all and only the PARM_DECLs that were
11735 pushed into scope by the loop above. */
11736 DECL_ARGUMENTS (fndecl) = getdecls ();
11739 DECL_ARGUMENTS (fndecl) = NULL_TREE;
11741 /* Now store the final chain of decls for the arguments
11742 as the decl-chain of the current lexical scope.
11743 Put the enumerators in as well, at the front so that
11744 DECL_ARGUMENTS is not modified. */
11745 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
11747 if (use_eh_spec_block (current_function_decl))
11748 current_eh_spec_block = begin_eh_spec_block ();
11752 /* We have finished doing semantic analysis on DECL, but have not yet
11753 generated RTL for its body. Save away our current state, so that
11754 when we want to generate RTL later we know what to do. */
11757 save_function_data (tree decl)
11759 struct language_function *f;
11761 /* Save the language-specific per-function data so that we can
11762 get it back when we really expand this function. */
11763 gcc_assert (!DECL_PENDING_INLINE_P (decl));
11766 f = GGC_NEW (struct language_function);
11767 memcpy (f, cp_function_chain, sizeof (struct language_function));
11768 DECL_SAVED_FUNCTION_DATA (decl) = f;
11770 /* Clear out the bits we don't need. */
11771 f->base.x_stmt_tree.x_cur_stmt_list = NULL_TREE;
11772 f->bindings = NULL;
11773 f->x_local_names = NULL;
11777 /* Set the return value of the constructor (if present). */
11780 finish_constructor_body (void)
11785 if (targetm.cxx.cdtor_returns_this ()
11786 && (! TYPE_FOR_JAVA (current_class_type)))
11788 /* Any return from a constructor will end up here. */
11789 add_stmt (build_stmt (LABEL_EXPR, cdtor_label));
11791 val = DECL_ARGUMENTS (current_function_decl);
11792 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
11793 DECL_RESULT (current_function_decl), val);
11794 /* Return the address of the object. */
11795 exprstmt = build_stmt (RETURN_EXPR, val);
11796 add_stmt (exprstmt);
11800 /* Do all the processing for the beginning of a destructor; set up the
11801 vtable pointers and cleanups for bases and members. */
11804 begin_destructor_body (void)
11806 tree compound_stmt;
11808 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
11809 issued an error message. We still want to try to process the
11810 body of the function, but initialize_vtbl_ptrs will crash if
11811 TYPE_BINFO is NULL. */
11812 if (COMPLETE_TYPE_P (current_class_type))
11814 compound_stmt = begin_compound_stmt (0);
11815 /* Make all virtual function table pointers in non-virtual base
11816 classes point to CURRENT_CLASS_TYPE's virtual function
11818 initialize_vtbl_ptrs (current_class_ptr);
11819 finish_compound_stmt (compound_stmt);
11821 /* And insert cleanups for our bases and members so that they
11822 will be properly destroyed if we throw. */
11823 push_base_cleanups ();
11827 /* At the end of every destructor we generate code to delete the object if
11828 necessary. Do that now. */
11831 finish_destructor_body (void)
11835 /* Any return from a destructor will end up here; that way all base
11836 and member cleanups will be run when the function returns. */
11837 add_stmt (build_stmt (LABEL_EXPR, cdtor_label));
11839 /* In a virtual destructor, we must call delete. */
11840 if (DECL_VIRTUAL_P (current_function_decl))
11843 tree virtual_size = cxx_sizeof (current_class_type);
11847 At the point of definition of a virtual destructor (including
11848 an implicit definition), non-placement operator delete shall
11849 be looked up in the scope of the destructor's class and if
11850 found shall be accessible and unambiguous. */
11851 exprstmt = build_op_delete_call(DELETE_EXPR, current_class_ptr,
11853 /*global_p=*/false,
11854 /*placement=*/NULL_TREE,
11855 /*alloc_fn=*/NULL_TREE);
11857 if_stmt = begin_if_stmt ();
11858 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
11859 current_in_charge_parm,
11862 finish_expr_stmt (exprstmt);
11863 finish_then_clause (if_stmt);
11864 finish_if_stmt (if_stmt);
11867 if (targetm.cxx.cdtor_returns_this ())
11871 val = DECL_ARGUMENTS (current_function_decl);
11872 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
11873 DECL_RESULT (current_function_decl), val);
11874 /* Return the address of the object. */
11875 exprstmt = build_stmt (RETURN_EXPR, val);
11876 add_stmt (exprstmt);
11880 /* Do the necessary processing for the beginning of a function body, which
11881 in this case includes member-initializers, but not the catch clauses of
11882 a function-try-block. Currently, this means opening a binding level
11883 for the member-initializers (in a ctor) and member cleanups (in a dtor). */
11886 begin_function_body (void)
11890 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
11893 if (processing_template_decl)
11894 /* Do nothing now. */;
11896 /* Always keep the BLOCK node associated with the outermost pair of
11897 curly braces of a function. These are needed for correct
11898 operation of dwarfout.c. */
11899 keep_next_level (true);
11901 stmt = begin_compound_stmt (BCS_FN_BODY);
11903 if (processing_template_decl)
11904 /* Do nothing now. */;
11905 else if (DECL_DESTRUCTOR_P (current_function_decl))
11906 begin_destructor_body ();
11911 /* Do the processing for the end of a function body. Currently, this means
11912 closing out the cleanups for fully-constructed bases and members, and in
11913 the case of the destructor, deleting the object if desired. Again, this
11914 is only meaningful for [cd]tors, since they are the only functions where
11915 there is a significant distinction between the main body and any
11916 function catch clauses. Handling, say, main() return semantics here
11917 would be wrong, as flowing off the end of a function catch clause for
11918 main() would also need to return 0. */
11921 finish_function_body (tree compstmt)
11923 if (compstmt == NULL_TREE)
11926 /* Close the block. */
11927 finish_compound_stmt (compstmt);
11929 if (processing_template_decl)
11930 /* Do nothing now. */;
11931 else if (DECL_CONSTRUCTOR_P (current_function_decl))
11932 finish_constructor_body ();
11933 else if (DECL_DESTRUCTOR_P (current_function_decl))
11934 finish_destructor_body ();
11937 /* Given a function, returns the BLOCK corresponding to the outermost level
11938 of curly braces, skipping the artificial block created for constructor
11942 outer_curly_brace_block (tree fndecl)
11944 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
11945 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
11946 /* Skip the artificial function body block. */
11947 block = BLOCK_SUBBLOCKS (block);
11951 /* Finish up a function declaration and compile that function
11952 all the way to assembler language output. The free the storage
11953 for the function definition.
11955 FLAGS is a bitwise or of the following values:
11957 We just finished processing the body of an in-class inline
11958 function definition. (This processing will have taken place
11959 after the class definition is complete.) */
11962 finish_function (int flags)
11964 tree fndecl = current_function_decl;
11965 tree fntype, ctype = NULL_TREE;
11966 int inclass_inline = (flags & 2) != 0;
11969 /* When we get some parse errors, we can end up without a
11970 current_function_decl, so cope. */
11971 if (fndecl == NULL_TREE)
11972 return error_mark_node;
11974 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
11975 && DECL_VIRTUAL_P (fndecl)
11976 && !processing_template_decl)
11978 tree fnclass = DECL_CONTEXT (fndecl);
11979 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
11980 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
11983 nested = function_depth > 1;
11984 fntype = TREE_TYPE (fndecl);
11986 /* TREE_READONLY (fndecl) = 1;
11987 This caused &foo to be of type ptr-to-const-function
11988 which then got a warning when stored in a ptr-to-function variable. */
11990 gcc_assert (building_stmt_tree ());
11991 /* The current function is being defined, so its DECL_INITIAL should
11992 be set, and unless there's a multiple definition, it should be
11993 error_mark_node. */
11994 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
11996 /* For a cloned function, we've already got all the code we need;
11997 there's no need to add any extra bits. */
11998 if (!DECL_CLONED_FUNCTION_P (fndecl))
12000 if (DECL_MAIN_P (current_function_decl))
12004 /* Make it so that `main' always returns 0 by default (or
12007 stmt = finish_return_stmt (integer_one_node);
12009 stmt = finish_return_stmt (integer_zero_node);
12011 /* Hack. We don't want the middle-end to warn that this
12012 return is unreachable, so put the statement on the
12015 location_t linezero = linemap_line_start (line_table, 0, 1);
12016 SET_EXPR_LOCATION (stmt, linezero);
12020 if (use_eh_spec_block (current_function_decl))
12021 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
12022 (TREE_TYPE (current_function_decl)),
12023 current_eh_spec_block);
12026 /* If we're saving up tree structure, tie off the function now. */
12027 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
12029 finish_fname_decls ();
12031 /* If this function can't throw any exceptions, remember that. */
12032 if (!processing_template_decl
12033 && !cp_function_chain->can_throw
12034 && !flag_non_call_exceptions
12035 && !DECL_REPLACEABLE_P (fndecl))
12036 TREE_NOTHROW (fndecl) = 1;
12038 /* This must come after expand_function_end because cleanups might
12039 have declarations (from inline functions) that need to go into
12040 this function's blocks. */
12042 /* If the current binding level isn't the outermost binding level
12043 for this function, either there is a bug, or we have experienced
12044 syntax errors and the statement tree is malformed. */
12045 if (current_binding_level->kind != sk_function_parms)
12047 /* Make sure we have already experienced errors. */
12048 gcc_assert (errorcount);
12050 /* Throw away the broken statement tree and extra binding
12052 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
12054 while (current_binding_level->kind != sk_function_parms)
12056 if (current_binding_level->kind == sk_class)
12057 pop_nested_class ();
12059 poplevel (0, 0, 0);
12062 poplevel (1, 0, 1);
12064 /* Statements should always be full-expressions at the outermost set
12065 of curly braces for a function. */
12066 gcc_assert (stmts_are_full_exprs_p ());
12068 /* Set up the named return value optimization, if we can. Candidate
12069 variables are selected in check_return_expr. */
12070 if (current_function_return_value)
12072 tree r = current_function_return_value;
12075 if (r != error_mark_node
12076 /* This is only worth doing for fns that return in memory--and
12077 simpler, since we don't have to worry about promoted modes. */
12078 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
12079 /* Only allow this for variables declared in the outer scope of
12080 the function so we know that their lifetime always ends with a
12081 return; see g++.dg/opt/nrv6.C. We could be more flexible if
12082 we were to do this optimization in tree-ssa. */
12083 && (outer = outer_curly_brace_block (fndecl))
12084 && chain_member (r, BLOCK_VARS (outer)))
12085 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
12087 current_function_return_value = NULL_TREE;
12090 /* Remember that we were in class scope. */
12091 if (current_class_name)
12092 ctype = current_class_type;
12094 /* Must mark the RESULT_DECL as being in this function. */
12095 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
12097 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
12098 to the FUNCTION_DECL node itself. */
12099 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
12101 /* Save away current state, if appropriate. */
12102 if (!processing_template_decl)
12103 save_function_data (fndecl);
12105 /* Complain if there's just no return statement. */
12106 if (warn_return_type
12107 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
12108 && !dependent_type_p (TREE_TYPE (fntype))
12109 && !current_function_returns_value && !current_function_returns_null
12110 /* Don't complain if we abort or throw. */
12111 && !current_function_returns_abnormally
12112 && !DECL_NAME (DECL_RESULT (fndecl))
12113 && !TREE_NO_WARNING (fndecl)
12114 /* Structor return values (if any) are set by the compiler. */
12115 && !DECL_CONSTRUCTOR_P (fndecl)
12116 && !DECL_DESTRUCTOR_P (fndecl))
12118 warning (OPT_Wreturn_type,
12119 "no return statement in function returning non-void");
12120 TREE_NO_WARNING (fndecl) = 1;
12123 /* Store the end of the function, so that we get good line number
12124 info for the epilogue. */
12125 cfun->function_end_locus = input_location;
12127 /* Genericize before inlining. */
12128 if (!processing_template_decl)
12130 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
12131 cp_genericize (fndecl);
12132 /* Clear out the bits we don't need. */
12133 f->x_current_class_ptr = NULL;
12134 f->x_current_class_ref = NULL;
12135 f->x_eh_spec_block = NULL;
12136 f->x_in_charge_parm = NULL;
12137 f->x_vtt_parm = NULL;
12138 f->x_return_value = NULL;
12139 f->bindings = NULL;
12140 f->extern_decl_map = NULL;
12142 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
12143 c_warn_unused_result (gimple_body (fndecl));
12145 /* Clear out the bits we don't need. */
12146 local_names = NULL;
12148 /* We're leaving the context of this function, so zap cfun. It's still in
12149 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
12151 current_function_decl = NULL;
12153 /* If this is an in-class inline definition, we may have to pop the
12154 bindings for the template parameters that we added in
12155 maybe_begin_member_template_processing when start_function was
12157 if (inclass_inline)
12158 maybe_end_member_template_processing ();
12160 /* Leave the scope of the class. */
12162 pop_nested_class ();
12168 /* Let the error reporting routines know that we're outside a
12169 function. For a nested function, this value is used in
12170 cxx_pop_function_context and then reset via pop_function_context. */
12171 current_function_decl = NULL_TREE;
12176 /* Create the FUNCTION_DECL for a function definition.
12177 DECLSPECS and DECLARATOR are the parts of the declaration;
12178 they describe the return type and the name of the function,
12179 but twisted together in a fashion that parallels the syntax of C.
12181 This function creates a binding context for the function body
12182 as well as setting up the FUNCTION_DECL in current_function_decl.
12184 Returns a FUNCTION_DECL on success.
12186 If the DECLARATOR is not suitable for a function (it defines a datum
12187 instead), we return 0, which tells yyparse to report a parse error.
12189 May return void_type_node indicating that this method is actually
12190 a friend. See grokfield for more details.
12192 Came here with a `.pushlevel' .
12194 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
12195 CHANGES TO CODE IN `grokfield'. */
12198 start_method (cp_decl_specifier_seq *declspecs,
12199 const cp_declarator *declarator, tree attrlist)
12201 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
12204 if (fndecl == error_mark_node)
12205 return error_mark_node;
12207 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
12209 error ("invalid member function declaration");
12210 return error_mark_node;
12214 cplus_decl_attributes (&fndecl, attrlist, 0);
12216 /* Pass friends other than inline friend functions back. */
12217 if (fndecl == void_type_node)
12220 if (DECL_IN_AGGR_P (fndecl))
12222 if (DECL_CONTEXT (fndecl)
12223 && TREE_CODE (DECL_CONTEXT (fndecl)) != NAMESPACE_DECL)
12224 error ("%qD is already defined in class %qT", fndecl,
12225 DECL_CONTEXT (fndecl));
12226 return error_mark_node;
12229 check_template_shadow (fndecl);
12231 DECL_DECLARED_INLINE_P (fndecl) = 1;
12233 /* We process method specializations in finish_struct_1. */
12234 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
12236 fndecl = push_template_decl (fndecl);
12237 if (fndecl == error_mark_node)
12241 if (! DECL_FRIEND_P (fndecl))
12243 if (TREE_CHAIN (fndecl))
12245 fndecl = copy_node (fndecl);
12246 TREE_CHAIN (fndecl) = NULL_TREE;
12250 finish_decl (fndecl, NULL_TREE, NULL_TREE);
12252 /* Make a place for the parms. */
12253 begin_scope (sk_function_parms, fndecl);
12255 DECL_IN_AGGR_P (fndecl) = 1;
12259 /* Go through the motions of finishing a function definition.
12260 We don't compile this method until after the whole class has
12263 FINISH_METHOD must return something that looks as though it
12264 came from GROKFIELD (since we are defining a method, after all).
12266 This is called after parsing the body of the function definition.
12267 STMTS is the chain of statements that makes up the function body.
12269 DECL is the ..._DECL that `start_method' provided. */
12272 finish_method (tree decl)
12274 tree fndecl = decl;
12279 if (decl == void_type_node)
12282 old_initial = DECL_INITIAL (fndecl);
12284 /* Undo the level for the parms (from start_method).
12285 This is like poplevel, but it causes nothing to be
12286 saved. Saving information here confuses symbol-table
12287 output routines. Besides, this information will
12288 be correctly output when this method is actually
12291 /* Clear out the meanings of the local variables of this level;
12292 also record in each decl which block it belongs to. */
12294 for (link = current_binding_level->names; link; link = TREE_CHAIN (link))
12296 if (DECL_NAME (link) != NULL_TREE)
12297 pop_binding (DECL_NAME (link), link);
12298 gcc_assert (TREE_CODE (link) != FUNCTION_DECL);
12299 DECL_CONTEXT (link) = NULL_TREE;
12302 poplevel (0, 0, 0);
12304 DECL_INITIAL (fndecl) = old_initial;
12306 /* We used to check if the context of FNDECL was different from
12307 current_class_type as another way to get inside here. This didn't work
12308 for String.cc in libg++. */
12309 if (DECL_FRIEND_P (fndecl))
12311 VEC_safe_push (tree, gc, CLASSTYPE_INLINE_FRIENDS (current_class_type),
12313 decl = void_type_node;
12320 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
12321 we can lay it out later, when and if its type becomes complete. */
12324 maybe_register_incomplete_var (tree var)
12326 gcc_assert (TREE_CODE (var) == VAR_DECL);
12328 /* Keep track of variables with incomplete types. */
12329 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
12330 && DECL_EXTERNAL (var))
12332 tree inner_type = TREE_TYPE (var);
12334 while (TREE_CODE (inner_type) == ARRAY_TYPE)
12335 inner_type = TREE_TYPE (inner_type);
12336 inner_type = TYPE_MAIN_VARIANT (inner_type);
12338 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
12339 /* RTTI TD entries are created while defining the type_info. */
12340 || (TYPE_LANG_SPECIFIC (inner_type)
12341 && TYPE_BEING_DEFINED (inner_type)))
12342 incomplete_vars = tree_cons (inner_type, var, incomplete_vars);
12346 /* Called when a class type (given by TYPE) is defined. If there are
12347 any existing VAR_DECLs whose type has been completed by this
12348 declaration, update them now. */
12351 complete_vars (tree type)
12353 tree *list = &incomplete_vars;
12355 gcc_assert (CLASS_TYPE_P (type));
12358 if (same_type_p (type, TREE_PURPOSE (*list)))
12360 tree var = TREE_VALUE (*list);
12361 tree type = TREE_TYPE (var);
12362 /* Complete the type of the variable. The VAR_DECL itself
12363 will be laid out in expand_expr. */
12364 complete_type (type);
12365 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
12366 /* Remove this entry from the list. */
12367 *list = TREE_CHAIN (*list);
12370 list = &TREE_CHAIN (*list);
12373 /* Check for pending declarations which may have abstract type. */
12374 complete_type_check_abstract (type);
12377 /* If DECL is of a type which needs a cleanup, build and return an
12378 expression to perform that cleanup here. Return NULL_TREE if no
12379 cleanup need be done. */
12382 cxx_maybe_build_cleanup (tree decl)
12388 /* Assume no cleanup is required. */
12389 cleanup = NULL_TREE;
12391 if (error_operand_p (decl))
12394 /* Handle "__attribute__((cleanup))". We run the cleanup function
12395 before the destructor since the destructor is what actually
12396 terminates the lifetime of the object. */
12397 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
12404 /* Get the name specified by the user for the cleanup function. */
12405 id = TREE_VALUE (TREE_VALUE (attr));
12406 /* Look up the name to find the cleanup function to call. It is
12407 important to use lookup_name here because that is what is
12408 used in c-common.c:handle_cleanup_attribute when performing
12409 initial checks on the attribute. Note that those checks
12410 include ensuring that the function found is not an overloaded
12411 function, or an object with an overloaded call operator,
12412 etc.; we can rely on the fact that the function found is an
12413 ordinary FUNCTION_DECL. */
12414 fn = lookup_name (id);
12415 arg = build_address (decl);
12417 cleanup = cp_build_function_call (fn, build_tree_list (NULL_TREE,
12419 tf_warning_or_error);
12421 /* Handle ordinary C++ destructors. */
12422 type = TREE_TYPE (decl);
12423 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
12425 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
12426 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
12427 && CLASSTYPE_VBASECLASSES (type));
12431 if (TREE_CODE (type) == ARRAY_TYPE)
12434 addr = build_address (decl);
12436 /* Optimize for space over speed here. */
12437 if (!has_vbases || flag_expensive_optimizations)
12438 flags |= LOOKUP_NONVIRTUAL;
12440 call = build_delete (TREE_TYPE (addr), addr,
12441 sfk_complete_destructor, flags, 0);
12443 cleanup = build_compound_expr (cleanup, call);
12451 /* When a stmt has been parsed, this function is called. */
12458 /* DECL was originally constructed as a non-static member function,
12459 but turned out to be static. Update it accordingly. */
12462 revert_static_member_fn (tree decl)
12465 tree function = TREE_TYPE (decl);
12466 tree args = TYPE_ARG_TYPES (function);
12468 if (cp_type_quals (TREE_TYPE (TREE_VALUE (args)))
12469 != TYPE_UNQUALIFIED)
12470 error ("static member function %q#D declared with type qualifiers", decl);
12472 args = TREE_CHAIN (args);
12473 tmp = build_function_type (TREE_TYPE (function), args);
12474 tmp = build_qualified_type (tmp, cp_type_quals (function));
12475 tmp = build_exception_variant (tmp,
12476 TYPE_RAISES_EXCEPTIONS (function));
12477 TREE_TYPE (decl) = tmp;
12478 if (DECL_ARGUMENTS (decl))
12479 DECL_ARGUMENTS (decl) = TREE_CHAIN (DECL_ARGUMENTS (decl));
12480 DECL_STATIC_FUNCTION_P (decl) = 1;
12483 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
12484 one of the language-independent trees. */
12486 enum cp_tree_node_structure_enum
12487 cp_tree_node_structure (union lang_tree_node * t)
12489 switch (TREE_CODE (&t->generic))
12491 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
12492 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
12493 case OVERLOAD: return TS_CP_OVERLOAD;
12494 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
12495 case PTRMEM_CST: return TS_CP_PTRMEM;
12496 case BASELINK: return TS_CP_BASELINK;
12497 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
12498 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
12499 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
12500 default: return TS_CP_GENERIC;
12504 /* Build the void_list_node (void_type_node having been created). */
12506 build_void_list_node (void)
12508 tree t = build_tree_list (NULL_TREE, void_type_node);
12513 cp_missing_noreturn_ok_p (tree decl)
12515 /* A missing noreturn is ok for the `main' function. */
12516 return DECL_MAIN_P (decl);
12519 /* Return the COMDAT group into which DECL should be placed. */
12522 cxx_comdat_group (tree decl)
12526 /* Virtual tables, construction virtual tables, and virtual table
12527 tables all go in a single COMDAT group, named after the primary
12529 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
12530 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
12531 /* For all other DECLs, the COMDAT group is the mangled name of the
12532 declaration itself. */
12535 while (DECL_THUNK_P (decl))
12537 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
12538 into the same section as the target function. In that case
12539 we must return target's name. */
12540 tree target = THUNK_TARGET (decl);
12541 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
12542 && DECL_SECTION_NAME (target) != NULL
12543 && DECL_ONE_ONLY (target))
12548 name = DECL_ASSEMBLER_NAME (decl);
12551 return IDENTIFIER_POINTER (name);
12554 #include "gt-cp-decl.h"