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' maches 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 namespace, walk_namespaces_fn f, void* data)
806 tree current = NAMESPACE_LEVEL (namespace)->namespaces;
808 result |= (*f) (namespace, 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 namespace, void* data)
832 struct cp_binding_level *level = NAMESPACE_LEVEL (namespace);
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 = cp_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 pedwarn ("%qD was declared %<extern%> and later %<static%>", newdecl);
1059 pedwarn ("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 pedwarn ("default argument given for parameter %d of %q#D",
1544 pedwarn ("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",
1555 if (DECL_DECLARED_INLINE_P (newdecl)
1556 && ! DECL_DECLARED_INLINE_P (olddecl)
1557 && TREE_ADDRESSABLE (olddecl) && warn_inline)
1559 warning (0, "%q#D was used before it was declared inline", newdecl);
1560 warning (0, "%Jprevious non-inline declaration here", olddecl);
1565 /* Do not merge an implicit typedef with an explicit one. In:
1569 typedef class A A __attribute__ ((foo));
1571 the attribute should apply only to the typedef. */
1572 if (TREE_CODE (olddecl) == TYPE_DECL
1573 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1574 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1577 /* If new decl is `static' and an `extern' was seen previously,
1579 warn_extern_redeclared_static (newdecl, olddecl);
1581 /* We have committed to returning 1 at this point. */
1582 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1584 /* Now that functions must hold information normally held
1585 by field decls, there is extra work to do so that
1586 declaration information does not get destroyed during
1588 if (DECL_VINDEX (olddecl))
1589 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1590 if (DECL_CONTEXT (olddecl))
1591 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1592 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1593 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1594 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1595 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1596 DECL_INVALID_OVERRIDER_P (newdecl) |= DECL_INVALID_OVERRIDER_P (olddecl);
1597 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1598 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1599 SET_OVERLOADED_OPERATOR_CODE
1600 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1601 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1603 /* Optionally warn about more than one declaration for the same
1604 name, but don't warn about a function declaration followed by a
1606 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1607 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1608 /* Don't warn about extern decl followed by definition. */
1609 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1610 /* Don't warn about friends, let add_friend take care of it. */
1611 && ! (newdecl_is_friend || DECL_FRIEND_P (olddecl)))
1613 warning (OPT_Wredundant_decls, "redundant redeclaration of %qD in same scope", newdecl);
1614 warning (OPT_Wredundant_decls, "previous declaration of %q+D", olddecl);
1618 /* Deal with C++: must preserve virtual function table size. */
1619 if (TREE_CODE (olddecl) == TYPE_DECL)
1621 tree newtype = TREE_TYPE (newdecl);
1622 tree oldtype = TREE_TYPE (olddecl);
1624 if (newtype != error_mark_node && oldtype != error_mark_node
1625 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1626 CLASSTYPE_FRIEND_CLASSES (newtype)
1627 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1629 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1632 /* Copy all the DECL_... slots specified in the new decl
1633 except for any that we copy here from the old type. */
1634 DECL_ATTRIBUTES (newdecl)
1635 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1637 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1641 old_result = DECL_TEMPLATE_RESULT (olddecl);
1642 new_result = DECL_TEMPLATE_RESULT (newdecl);
1643 TREE_TYPE (olddecl) = TREE_TYPE (old_result);
1644 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1645 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1646 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1648 DECL_ATTRIBUTES (old_result)
1649 = (*targetm.merge_decl_attributes) (old_result, new_result);
1651 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1653 if (GNU_INLINE_P (old_result) != GNU_INLINE_P (new_result)
1654 && DECL_INITIAL (new_result))
1656 if (DECL_INITIAL (old_result))
1658 DECL_INLINE (old_result) = 0;
1659 DECL_UNINLINABLE (old_result) = 1;
1663 DECL_INLINE (old_result) = DECL_INLINE (new_result);
1664 DECL_UNINLINABLE (old_result) = DECL_UNINLINABLE (new_result);
1666 DECL_EXTERNAL (old_result) = DECL_EXTERNAL (new_result);
1667 DECL_NOT_REALLY_EXTERN (old_result)
1668 = DECL_NOT_REALLY_EXTERN (new_result);
1669 DECL_INTERFACE_KNOWN (old_result)
1670 = DECL_INTERFACE_KNOWN (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);
1679 DECL_INLINE (old_result)
1680 |= DECL_INLINE (new_result);
1681 DECL_DECLARED_INLINE_P (old_result)
1682 |= DECL_DECLARED_INLINE_P (new_result);
1683 DECL_DISREGARD_INLINE_LIMITS (old_result)
1684 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1685 check_redeclaration_exception_specification (newdecl, olddecl);
1689 /* If the new declaration is a definition, update the file and
1690 line information on the declaration, and also make
1691 the old declaration the same definition. */
1692 if (DECL_INITIAL (new_result) != NULL_TREE)
1694 DECL_SOURCE_LOCATION (olddecl)
1695 = DECL_SOURCE_LOCATION (old_result)
1696 = DECL_SOURCE_LOCATION (newdecl);
1697 DECL_INITIAL (old_result) = DECL_INITIAL (new_result);
1698 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1699 DECL_ARGUMENTS (old_result)
1700 = DECL_ARGUMENTS (new_result);
1708 /* Automatically handles default parameters. */
1709 tree oldtype = TREE_TYPE (olddecl);
1712 /* Merge the data types specified in the two decls. */
1713 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1715 /* If merge_types produces a non-typedef type, just use the old type. */
1716 if (TREE_CODE (newdecl) == TYPE_DECL
1717 && newtype == DECL_ORIGINAL_TYPE (newdecl))
1720 if (TREE_CODE (newdecl) == VAR_DECL)
1722 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
1723 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
1724 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl)
1725 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl);
1726 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
1727 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
1729 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
1730 if (DECL_LANG_SPECIFIC (olddecl)
1731 && CP_DECL_THREADPRIVATE_P (olddecl))
1733 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
1734 if (!DECL_LANG_SPECIFIC (newdecl))
1735 retrofit_lang_decl (newdecl);
1737 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
1738 CP_DECL_THREADPRIVATE_P (newdecl) = 1;
1742 /* Do this after calling `merge_types' so that default
1743 parameters don't confuse us. */
1744 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1745 check_redeclaration_exception_specification (newdecl, olddecl);
1746 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
1748 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1749 check_default_args (newdecl);
1751 /* Lay the type out, unless already done. */
1752 if (! same_type_p (newtype, oldtype)
1753 && TREE_TYPE (newdecl) != error_mark_node
1754 && !(processing_template_decl && uses_template_parms (newdecl)))
1755 layout_type (TREE_TYPE (newdecl));
1757 if ((TREE_CODE (newdecl) == VAR_DECL
1758 || TREE_CODE (newdecl) == PARM_DECL
1759 || TREE_CODE (newdecl) == RESULT_DECL
1760 || TREE_CODE (newdecl) == FIELD_DECL
1761 || TREE_CODE (newdecl) == TYPE_DECL)
1762 && !(processing_template_decl && uses_template_parms (newdecl)))
1763 layout_decl (newdecl, 0);
1765 /* Merge the type qualifiers. */
1766 if (TREE_READONLY (newdecl))
1767 TREE_READONLY (olddecl) = 1;
1768 if (TREE_THIS_VOLATILE (newdecl))
1769 TREE_THIS_VOLATILE (olddecl) = 1;
1770 if (TREE_NOTHROW (newdecl))
1771 TREE_NOTHROW (olddecl) = 1;
1773 /* Merge deprecatedness. */
1774 if (TREE_DEPRECATED (newdecl))
1775 TREE_DEPRECATED (olddecl) = 1;
1777 /* Merge the initialization information. */
1778 if (DECL_INITIAL (newdecl) == NULL_TREE
1779 && DECL_INITIAL (olddecl) != NULL_TREE)
1781 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1782 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1783 if (CAN_HAVE_FULL_LANG_DECL_P (newdecl)
1784 && DECL_LANG_SPECIFIC (newdecl)
1785 && DECL_LANG_SPECIFIC (olddecl))
1787 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1788 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1792 /* Merge the section attribute.
1793 We want to issue an error if the sections conflict but that must be
1794 done later in decl_attributes since we are called before attributes
1796 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1797 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1799 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1801 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1802 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1803 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1804 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1805 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1806 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
1807 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1808 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
1809 DECL_IS_PURE (newdecl) |= DECL_IS_PURE (olddecl);
1810 /* Keep the old RTL. */
1811 COPY_DECL_RTL (olddecl, newdecl);
1813 else if (TREE_CODE (newdecl) == VAR_DECL
1814 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
1816 /* Keep the old RTL. We cannot keep the old RTL if the old
1817 declaration was for an incomplete object and the new
1818 declaration is not since many attributes of the RTL will
1820 COPY_DECL_RTL (olddecl, newdecl);
1823 /* If cannot merge, then use the new type and qualifiers,
1824 and don't preserve the old rtl. */
1827 /* Clean out any memory we had of the old declaration. */
1828 tree oldstatic = value_member (olddecl, static_aggregates);
1830 TREE_VALUE (oldstatic) = error_mark_node;
1832 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1833 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1834 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1835 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1838 /* Merge the storage class information. */
1839 merge_weak (newdecl, olddecl);
1841 DECL_ONE_ONLY (newdecl) |= DECL_ONE_ONLY (olddecl);
1842 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
1843 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1844 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
1845 if (! DECL_EXTERNAL (olddecl))
1846 DECL_EXTERNAL (newdecl) = 0;
1848 new_template = NULL_TREE;
1849 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
1851 bool new_redefines_gnu_inline = false;
1853 if (new_defines_function
1854 && ((DECL_INTERFACE_KNOWN (olddecl)
1855 && TREE_CODE (olddecl) == FUNCTION_DECL)
1856 || (TREE_CODE (olddecl) == TEMPLATE_DECL
1857 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
1858 == FUNCTION_DECL))))
1862 if (TREE_CODE (fn) == TEMPLATE_DECL)
1863 fn = DECL_TEMPLATE_RESULT (olddecl);
1865 new_redefines_gnu_inline = GNU_INLINE_P (fn) && DECL_INITIAL (fn);
1868 if (!new_redefines_gnu_inline)
1870 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
1871 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
1872 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
1874 DECL_TEMPLATE_INSTANTIATED (newdecl)
1875 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
1877 /* If the OLDDECL is an instantiation and/or specialization,
1878 then the NEWDECL must be too. But, it may not yet be marked
1879 as such if the caller has created NEWDECL, but has not yet
1880 figured out that it is a redeclaration. */
1881 if (!DECL_USE_TEMPLATE (newdecl))
1882 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
1884 /* Don't really know how much of the language-specific
1885 values we should copy from old to new. */
1886 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
1887 DECL_LANG_SPECIFIC (newdecl)->decl_flags.u2 =
1888 DECL_LANG_SPECIFIC (olddecl)->decl_flags.u2;
1889 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
1890 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
1891 if (DECL_TEMPLATE_INFO (newdecl))
1892 new_template = DECL_TI_TEMPLATE (newdecl);
1893 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
1894 DECL_INITIALIZED_IN_CLASS_P (newdecl)
1895 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
1896 olddecl_friend = DECL_FRIEND_P (olddecl);
1897 hidden_friend = (DECL_ANTICIPATED (olddecl)
1898 && DECL_HIDDEN_FRIEND_P (olddecl)
1899 && newdecl_is_friend);
1901 /* Only functions have DECL_BEFRIENDING_CLASSES. */
1902 if (TREE_CODE (newdecl) == FUNCTION_DECL
1903 || DECL_FUNCTION_TEMPLATE_P (newdecl))
1905 DECL_BEFRIENDING_CLASSES (newdecl)
1906 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
1907 DECL_BEFRIENDING_CLASSES (olddecl));
1908 /* DECL_THUNKS is only valid for virtual functions,
1909 otherwise it is a DECL_FRIEND_CONTEXT. */
1910 if (DECL_VIRTUAL_P (newdecl))
1911 DECL_THUNKS (newdecl) = DECL_THUNKS (olddecl);
1915 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1917 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
1918 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
1920 /* If newdecl is not a specialization, then it is not a
1921 template-related function at all. And that means that we
1922 should have exited above, returning 0. */
1923 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
1925 if (TREE_USED (olddecl))
1926 /* From [temp.expl.spec]:
1928 If a template, a member template or the member of a class
1929 template is explicitly specialized then that
1930 specialization shall be declared before the first use of
1931 that specialization that would cause an implicit
1932 instantiation to take place, in every translation unit in
1933 which such a use occurs. */
1934 error ("explicit specialization of %qD after first use",
1937 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
1939 /* Don't propagate visibility from the template to the
1940 specialization here. We'll do that in determine_visibility if
1942 DECL_VISIBILITY_SPECIFIED (olddecl) = 0;
1944 /* [temp.expl.spec/14] We don't inline explicit specialization
1945 just because the primary template says so. */
1947 else if (new_defines_function && DECL_INITIAL (olddecl))
1949 /* C++ is always in in unit-at-a-time mode, so we never
1950 inline re-defined extern inline functions. */
1951 DECL_INLINE (newdecl) = 0;
1952 DECL_UNINLINABLE (newdecl) = 1;
1956 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
1957 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
1959 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
1961 /* If either decl says `inline', this fn is inline, unless
1962 its definition was passed already. */
1963 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == NULL_TREE)
1964 DECL_INLINE (olddecl) = 1;
1965 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1967 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1968 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1970 DECL_DISREGARD_INLINE_LIMITS (newdecl)
1971 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
1972 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
1973 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
1976 /* Preserve abstractness on cloned [cd]tors. */
1977 DECL_ABSTRACT (newdecl) = DECL_ABSTRACT (olddecl);
1981 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1982 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
1983 COPY_DECL_RTL (newdecl, olddecl);
1985 if (! types_match || new_defines_function)
1987 /* These need to be copied so that the names are available.
1988 Note that if the types do match, we'll preserve inline
1989 info and other bits, but if not, we won't. */
1990 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
1991 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
1993 if (new_defines_function)
1994 /* If defining a function declared with other language
1995 linkage, use the previously declared language linkage. */
1996 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1997 else if (types_match)
1999 /* If redeclaring a builtin function, and not a definition,
2000 it stays built in. */
2001 if (DECL_BUILT_IN (olddecl))
2003 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2004 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2005 /* If we're keeping the built-in definition, keep the rtl,
2006 regardless of declaration matches. */
2007 COPY_DECL_RTL (olddecl, newdecl);
2010 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2011 /* Don't clear out the arguments if we're redefining a function. */
2012 if (DECL_ARGUMENTS (olddecl))
2013 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2016 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
2017 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
2019 /* Now preserve various other info from the definition. */
2020 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
2021 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
2022 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2023 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2025 /* Warn about conflicting visibility specifications. */
2026 if (DECL_VISIBILITY_SPECIFIED (olddecl)
2027 && DECL_VISIBILITY_SPECIFIED (newdecl)
2028 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2030 warning (OPT_Wattributes, "%q+D: visibility attribute ignored "
2031 "because it", newdecl);
2032 warning (OPT_Wattributes, "%Jconflicts with previous "
2033 "declaration here", olddecl);
2035 /* Choose the declaration which specified visibility. */
2036 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2038 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2039 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2041 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2042 so keep this behavior. */
2043 if (TREE_CODE (newdecl) == VAR_DECL && DECL_HAS_INIT_PRIORITY_P (newdecl))
2045 SET_DECL_INIT_PRIORITY (olddecl, DECL_INIT_PRIORITY (newdecl));
2046 DECL_HAS_INIT_PRIORITY_P (olddecl) = 1;
2049 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2050 with that from NEWDECL below. */
2051 if (DECL_LANG_SPECIFIC (olddecl))
2053 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
2054 != DECL_LANG_SPECIFIC (newdecl));
2055 ggc_free (DECL_LANG_SPECIFIC (olddecl));
2058 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2062 function_size = sizeof (struct tree_decl_common);
2064 memcpy ((char *) olddecl + sizeof (struct tree_common),
2065 (char *) newdecl + sizeof (struct tree_common),
2066 function_size - sizeof (struct tree_common));
2068 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2069 (char *) newdecl + sizeof (struct tree_decl_common),
2070 sizeof (struct tree_function_decl) - sizeof (struct tree_decl_common));
2072 /* If newdecl is a template instantiation, it is possible that
2073 the following sequence of events has occurred:
2075 o A friend function was declared in a class template. The
2076 class template was instantiated.
2078 o The instantiation of the friend declaration was
2079 recorded on the instantiation list, and is newdecl.
2081 o Later, however, instantiate_class_template called pushdecl
2082 on the newdecl to perform name injection. But, pushdecl in
2083 turn called duplicate_decls when it discovered that another
2084 declaration of a global function with the same name already
2087 o Here, in duplicate_decls, we decided to clobber newdecl.
2089 If we're going to do that, we'd better make sure that
2090 olddecl, and not newdecl, is on the list of
2091 instantiations so that if we try to do the instantiation
2092 again we won't get the clobbered declaration. */
2093 reregister_specialization (newdecl,
2099 size_t size = tree_code_size (TREE_CODE (olddecl));
2100 memcpy ((char *) olddecl + sizeof (struct tree_common),
2101 (char *) newdecl + sizeof (struct tree_common),
2102 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2103 switch (TREE_CODE (olddecl))
2113 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2114 (char *) newdecl + sizeof (struct tree_decl_common),
2115 size - sizeof (struct tree_decl_common)
2116 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2120 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2121 (char *) newdecl + sizeof (struct tree_decl_common),
2122 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)
2123 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2127 DECL_UID (olddecl) = olddecl_uid;
2129 DECL_FRIEND_P (olddecl) = 1;
2132 DECL_ANTICIPATED (olddecl) = 1;
2133 DECL_HIDDEN_FRIEND_P (olddecl) = 1;
2136 /* NEWDECL contains the merged attribute lists.
2137 Update OLDDECL to be the same. */
2138 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2140 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2141 so that encode_section_info has a chance to look at the new decl
2142 flags and attributes. */
2143 if (DECL_RTL_SET_P (olddecl)
2144 && (TREE_CODE (olddecl) == FUNCTION_DECL
2145 || (TREE_CODE (olddecl) == VAR_DECL
2146 && TREE_STATIC (olddecl))))
2147 make_decl_rtl (olddecl);
2149 /* The NEWDECL will no longer be needed. Because every out-of-class
2150 declaration of a member results in a call to duplicate_decls,
2151 freeing these nodes represents in a significant savings. */
2152 remove_decl_from_map (newdecl);
2158 /* Return zero if the declaration NEWDECL is valid
2159 when the declaration OLDDECL (assumed to be for the same name)
2160 has already been seen.
2161 Otherwise return an error message format string with a %s
2162 where the identifier should go. */
2165 redeclaration_error_message (tree newdecl, tree olddecl)
2167 if (TREE_CODE (newdecl) == TYPE_DECL)
2169 /* Because C++ can put things into name space for free,
2170 constructs like "typedef struct foo { ... } foo"
2171 would look like an erroneous redeclaration. */
2172 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
2175 return "redefinition of %q#D";
2177 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2179 /* If this is a pure function, its olddecl will actually be
2180 the original initialization to `0' (which we force to call
2181 abort()). Don't complain about redefinition in this case. */
2182 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
2183 && DECL_INITIAL (olddecl) == NULL_TREE)
2186 /* If both functions come from different namespaces, this is not
2187 a redeclaration - this is a conflict with a used function. */
2188 if (DECL_NAMESPACE_SCOPE_P (olddecl)
2189 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
2190 && ! decls_match (olddecl, newdecl))
2191 return "%qD conflicts with used function";
2193 /* We'll complain about linkage mismatches in
2194 warn_extern_redeclared_static. */
2196 /* Defining the same name twice is no good. */
2197 if (DECL_INITIAL (olddecl) != NULL_TREE
2198 && DECL_INITIAL (newdecl) != NULL_TREE)
2200 if (DECL_NAME (olddecl) == NULL_TREE)
2201 return "%q#D not declared in class";
2202 else if (!GNU_INLINE_P (olddecl)
2203 || GNU_INLINE_P (newdecl))
2204 return "redefinition of %q#D";
2207 if (DECL_DECLARED_INLINE_P (olddecl) && DECL_DECLARED_INLINE_P (newdecl))
2209 bool olda = GNU_INLINE_P (olddecl);
2210 bool newa = GNU_INLINE_P (newdecl);
2215 return "%q+D redeclared inline with %<gnu_inline%> attribute";
2217 return "%q+D redeclared inline without %<gnu_inline%> attribute";
2223 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
2227 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
2229 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
2230 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
2231 return "redefinition of %q#D";
2235 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
2236 || (DECL_TEMPLATE_RESULT (newdecl)
2237 == DECL_TEMPLATE_RESULT (olddecl)))
2240 nt = DECL_TEMPLATE_RESULT (newdecl);
2241 if (DECL_TEMPLATE_INFO (nt))
2242 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
2243 ot = DECL_TEMPLATE_RESULT (olddecl);
2244 if (DECL_TEMPLATE_INFO (ot))
2245 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
2246 if (DECL_INITIAL (nt) && DECL_INITIAL (ot)
2247 && (!GNU_INLINE_P (ot) || GNU_INLINE_P (nt)))
2248 return "redefinition of %q#D";
2250 if (DECL_DECLARED_INLINE_P (ot) && DECL_DECLARED_INLINE_P (nt))
2252 bool olda = GNU_INLINE_P (ot);
2253 bool newa = GNU_INLINE_P (nt);
2258 return "%q+D redeclared inline with %<gnu_inline%> attribute";
2260 return "%q+D redeclared inline without %<gnu_inline%> attribute";
2264 /* Core issue #226 (C++0x):
2266 If a friend function template declaration specifies a
2267 default template-argument, that declaration shall be a
2268 definition and shall be the only declaration of the
2269 function template in the translation unit. */
2270 if ((cxx_dialect != cxx98)
2271 && TREE_CODE (ot) == FUNCTION_DECL && DECL_FRIEND_P (ot)
2272 && !check_default_tmpl_args (nt, DECL_TEMPLATE_PARMS (newdecl),
2273 /*is_primary=*/1, /*is_partial=*/0,
2274 /*is_friend_decl=*/2))
2275 return "redeclaration of friend %q#D may not have default template arguments";
2279 else if (TREE_CODE (newdecl) == VAR_DECL
2280 && DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl)
2281 && (! DECL_LANG_SPECIFIC (olddecl)
2282 || ! CP_DECL_THREADPRIVATE_P (olddecl)
2283 || DECL_THREAD_LOCAL_P (newdecl)))
2285 /* Only variables can be thread-local, and all declarations must
2286 agree on this property. */
2287 if (DECL_THREAD_LOCAL_P (newdecl))
2288 return "thread-local declaration of %q#D follows "
2289 "non-thread-local declaration";
2291 return "non-thread-local declaration of %q#D follows "
2292 "thread-local declaration";
2294 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2296 /* The objects have been declared at namespace scope. If either
2297 is a member of an anonymous union, then this is an invalid
2298 redeclaration. For example:
2304 if ((TREE_CODE (newdecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (newdecl))
2305 || (TREE_CODE (olddecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (olddecl)))
2306 return "redeclaration of %q#D";
2307 /* If at least one declaration is a reference, there is no
2308 conflict. For example:
2314 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2316 /* Reject two definitions. */
2317 return "redefinition of %q#D";
2321 /* Objects declared with block scope: */
2322 /* Reject two definitions, and reject a definition
2323 together with an external reference. */
2324 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2325 return "redeclaration of %q#D";
2330 /* Hash and equality functions for the named_label table. */
2333 named_label_entry_hash (const void *data)
2335 const struct named_label_entry *ent = (const struct named_label_entry *) data;
2336 return DECL_UID (ent->label_decl);
2340 named_label_entry_eq (const void *a, const void *b)
2342 const struct named_label_entry *ent_a = (const struct named_label_entry *) a;
2343 const struct named_label_entry *ent_b = (const struct named_label_entry *) b;
2344 return ent_a->label_decl == ent_b->label_decl;
2347 /* Create a new label, named ID. */
2350 make_label_decl (tree id, int local_p)
2352 struct named_label_entry *ent;
2356 decl = build_decl (LABEL_DECL, id, void_type_node);
2358 DECL_CONTEXT (decl) = current_function_decl;
2359 DECL_MODE (decl) = VOIDmode;
2360 C_DECLARED_LABEL_FLAG (decl) = local_p;
2362 /* Say where one reference is to the label, for the sake of the
2363 error if it is not defined. */
2364 DECL_SOURCE_LOCATION (decl) = input_location;
2366 /* Record the fact that this identifier is bound to this label. */
2367 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2369 /* Create the label htab for the function on demand. */
2371 named_labels = htab_create_ggc (13, named_label_entry_hash,
2372 named_label_entry_eq, NULL);
2374 /* Record this label on the list of labels used in this function.
2375 We do this before calling make_label_decl so that we get the
2376 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2377 ent = GGC_CNEW (struct named_label_entry);
2378 ent->label_decl = decl;
2380 slot = htab_find_slot (named_labels, ent, INSERT);
2381 gcc_assert (*slot == NULL);
2387 /* Look for a label named ID in the current function. If one cannot
2388 be found, create one. (We keep track of used, but undefined,
2389 labels, and complain about them at the end of a function.) */
2392 lookup_label (tree id)
2396 timevar_push (TV_NAME_LOOKUP);
2397 /* You can't use labels at global scope. */
2398 if (current_function_decl == NULL_TREE)
2400 error ("label %qE referenced outside of any function", id);
2401 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, NULL_TREE);
2404 /* See if we've already got this label. */
2405 decl = IDENTIFIER_LABEL_VALUE (id);
2406 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2407 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2409 decl = make_label_decl (id, /*local_p=*/0);
2410 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2413 /* Declare a local label named ID. */
2416 declare_local_label (tree id)
2420 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2421 this scope we can restore the old value of IDENTIFIER_TYPE_VALUE. */
2422 shadow = tree_cons (IDENTIFIER_LABEL_VALUE (id), NULL_TREE,
2423 current_binding_level->shadowed_labels);
2424 current_binding_level->shadowed_labels = shadow;
2426 decl = make_label_decl (id, /*local_p=*/1);
2427 TREE_VALUE (shadow) = decl;
2432 /* Returns nonzero if it is ill-formed to jump past the declaration of
2433 DECL. Returns 2 if it's also a real problem. */
2436 decl_jump_unsafe (tree decl)
2438 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl)
2439 || TREE_TYPE (decl) == error_mark_node)
2442 if (TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))
2443 || DECL_NONTRIVIALLY_INITIALIZED_P (decl))
2446 if (pod_type_p (TREE_TYPE (decl)))
2449 /* The POD stuff is just pedantry; why should it matter if the class
2450 contains a field of pointer to member type? */
2454 /* A subroutine of check_previous_goto_1 to identify a branch to the user. */
2457 identify_goto (tree decl, const location_t *locus)
2460 pedwarn ("jump to label %qD", decl);
2462 pedwarn ("jump to case label");
2464 pedwarn ("%H from here", locus);
2467 /* Check that a single previously seen jump to a newly defined label
2468 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2469 the jump context; NAMES are the names in scope in LEVEL at the jump
2470 context; LOCUS is the source position of the jump or 0. Returns
2471 true if all is well. */
2474 check_previous_goto_1 (tree decl, struct cp_binding_level* level, tree names,
2475 bool exited_omp, const location_t *locus)
2477 struct cp_binding_level *b;
2478 bool identified = false, saw_eh = false, saw_omp = false;
2482 identify_goto (decl, locus);
2483 error (" exits OpenMP structured block");
2484 identified = saw_omp = true;
2487 for (b = current_binding_level; b ; b = b->level_chain)
2489 tree new_decls, old_decls = (b == level ? names : NULL_TREE);
2491 for (new_decls = b->names; new_decls != old_decls;
2492 new_decls = TREE_CHAIN (new_decls))
2494 int problem = decl_jump_unsafe (new_decls);
2500 identify_goto (decl, locus);
2504 error (" crosses initialization of %q+#D", new_decls);
2506 pedwarn (" enters scope of non-POD %q+#D", new_decls);
2511 if ((b->kind == sk_try || b->kind == sk_catch) && !saw_eh)
2515 identify_goto (decl, locus);
2518 if (b->kind == sk_try)
2519 error (" enters try block");
2521 error (" enters catch block");
2524 if (b->kind == sk_omp && !saw_omp)
2528 identify_goto (decl, locus);
2531 error (" enters OpenMP structured block");
2540 check_previous_goto (tree decl, struct named_label_use_entry *use)
2542 check_previous_goto_1 (decl, use->binding_level,
2543 use->names_in_scope, use->in_omp_scope,
2544 &use->o_goto_locus);
2548 check_switch_goto (struct cp_binding_level* level)
2550 return check_previous_goto_1 (NULL_TREE, level, level->names, false, NULL);
2553 /* Check that a new jump to a label DECL is OK. Called by
2554 finish_goto_stmt. */
2557 check_goto (tree decl)
2559 struct named_label_entry *ent, dummy;
2560 bool saw_catch = false, identified = false;
2563 /* We can't know where a computed goto is jumping.
2564 So we assume that it's OK. */
2565 if (TREE_CODE (decl) != LABEL_DECL)
2568 /* We didn't record any information about this label when we created it,
2569 and there's not much point since it's trivial to analyze as a return. */
2570 if (decl == cdtor_label)
2573 dummy.label_decl = decl;
2574 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2575 gcc_assert (ent != NULL);
2577 /* If the label hasn't been defined yet, defer checking. */
2578 if (! DECL_INITIAL (decl))
2580 struct named_label_use_entry *new_use;
2582 /* Don't bother creating another use if the last goto had the
2583 same data, and will therefore create the same set of errors. */
2585 && ent->uses->names_in_scope == current_binding_level->names)
2588 new_use = GGC_NEW (struct named_label_use_entry);
2589 new_use->binding_level = current_binding_level;
2590 new_use->names_in_scope = current_binding_level->names;
2591 new_use->o_goto_locus = input_location;
2592 new_use->in_omp_scope = false;
2594 new_use->next = ent->uses;
2595 ent->uses = new_use;
2599 if (ent->in_try_scope || ent->in_catch_scope
2600 || ent->in_omp_scope || ent->bad_decls)
2602 pedwarn ("jump to label %q+D", decl);
2603 pedwarn (" from here");
2607 for (bad = ent->bad_decls; bad; bad = TREE_CHAIN (bad))
2609 tree b = TREE_VALUE (bad);
2610 int u = decl_jump_unsafe (b);
2612 if (u > 1 && DECL_ARTIFICIAL (b))
2614 /* Can't skip init of __exception_info. */
2615 error ("%J enters catch block", b);
2619 error (" skips initialization of %q+#D", b);
2621 pedwarn (" enters scope of non-POD %q+#D", b);
2624 if (ent->in_try_scope)
2625 error (" enters try block");
2626 else if (ent->in_catch_scope && !saw_catch)
2627 error (" enters catch block");
2629 if (ent->in_omp_scope)
2630 error (" enters OpenMP structured block");
2631 else if (flag_openmp)
2633 struct cp_binding_level *b;
2634 for (b = current_binding_level; b ; b = b->level_chain)
2636 if (b == ent->binding_level)
2638 if (b->kind == sk_omp)
2642 pedwarn ("jump to label %q+D", decl);
2643 pedwarn (" from here");
2646 error (" exits OpenMP structured block");
2653 /* Check that a return is ok wrt OpenMP structured blocks.
2654 Called by finish_return_stmt. Returns true if all is well. */
2657 check_omp_return (void)
2659 struct cp_binding_level *b;
2660 for (b = current_binding_level; b ; b = b->level_chain)
2661 if (b->kind == sk_omp)
2663 error ("invalid exit from OpenMP structured block");
2669 /* Define a label, specifying the location in the source file.
2670 Return the LABEL_DECL node for the label. */
2673 define_label (location_t location, tree name)
2675 struct named_label_entry *ent, dummy;
2676 struct cp_binding_level *p;
2679 timevar_push (TV_NAME_LOOKUP);
2681 decl = lookup_label (name);
2683 dummy.label_decl = decl;
2684 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2685 gcc_assert (ent != NULL);
2687 /* After labels, make any new cleanups in the function go into their
2688 own new (temporary) binding contour. */
2689 for (p = current_binding_level;
2690 p->kind != sk_function_parms;
2692 p->more_cleanups_ok = 0;
2694 if (name == get_identifier ("wchar_t"))
2695 pedwarn ("label named wchar_t");
2697 if (DECL_INITIAL (decl) != NULL_TREE)
2699 error ("duplicate label %qD", decl);
2700 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
2704 struct named_label_use_entry *use;
2706 /* Mark label as having been defined. */
2707 DECL_INITIAL (decl) = error_mark_node;
2708 /* Say where in the source. */
2709 DECL_SOURCE_LOCATION (decl) = location;
2711 ent->binding_level = current_binding_level;
2712 ent->names_in_scope = current_binding_level->names;
2714 for (use = ent->uses; use ; use = use->next)
2715 check_previous_goto (decl, use);
2719 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2724 struct cp_binding_level *level;
2725 struct cp_switch *next;
2726 /* The SWITCH_STMT being built. */
2728 /* A splay-tree mapping the low element of a case range to the high
2729 element, or NULL_TREE if there is no high element. Used to
2730 determine whether or not a new case label duplicates an old case
2731 label. We need a tree, rather than simply a hash table, because
2732 of the GNU case range extension. */
2736 /* A stack of the currently active switch statements. The innermost
2737 switch statement is on the top of the stack. There is no need to
2738 mark the stack for garbage collection because it is only active
2739 during the processing of the body of a function, and we never
2740 collect at that point. */
2742 static struct cp_switch *switch_stack;
2744 /* Called right after a switch-statement condition is parsed.
2745 SWITCH_STMT is the switch statement being parsed. */
2748 push_switch (tree switch_stmt)
2750 struct cp_switch *p = XNEW (struct cp_switch);
2751 p->level = current_binding_level;
2752 p->next = switch_stack;
2753 p->switch_stmt = switch_stmt;
2754 p->cases = splay_tree_new (case_compare, NULL, NULL);
2761 struct cp_switch *cs = switch_stack;
2762 location_t switch_location;
2764 /* Emit warnings as needed. */
2765 if (EXPR_HAS_LOCATION (cs->switch_stmt))
2766 switch_location = EXPR_LOCATION (cs->switch_stmt);
2768 switch_location = input_location;
2769 if (!processing_template_decl)
2770 c_do_switch_warnings (cs->cases, switch_location,
2771 SWITCH_STMT_TYPE (cs->switch_stmt),
2772 SWITCH_STMT_COND (cs->switch_stmt));
2774 splay_tree_delete (cs->cases);
2775 switch_stack = switch_stack->next;
2779 /* Note that we've seen a definition of a case label, and complain if this
2780 is a bad place for one. */
2783 finish_case_label (tree low_value, tree high_value)
2786 struct cp_binding_level *p;
2788 if (processing_template_decl)
2792 /* For templates, just add the case label; we'll do semantic
2793 analysis at instantiation-time. */
2794 label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
2795 return add_stmt (build_case_label (low_value, high_value, label));
2798 /* Find the condition on which this switch statement depends. */
2799 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
2800 if (cond && TREE_CODE (cond) == TREE_LIST)
2801 cond = TREE_VALUE (cond);
2803 if (!check_switch_goto (switch_stack->level))
2804 return error_mark_node;
2806 r = c_add_case_label (switch_stack->cases, cond, TREE_TYPE (cond),
2807 low_value, high_value);
2809 /* After labels, make any new cleanups in the function go into their
2810 own new (temporary) binding contour. */
2811 for (p = current_binding_level;
2812 p->kind != sk_function_parms;
2814 p->more_cleanups_ok = 0;
2819 /* Hash a TYPENAME_TYPE. K is really of type `tree'. */
2822 typename_hash (const void* k)
2825 const_tree const t = (const_tree) k;
2827 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
2828 ^ htab_hash_pointer (DECL_NAME (TYPE_NAME (t))));
2833 typedef struct typename_info {
2841 /* Compare two TYPENAME_TYPEs. K1 is really of type `tree', K2 is
2842 really of type `typename_info*' */
2845 typename_compare (const void * k1, const void * k2)
2847 const_tree const t1 = (const_tree) k1;
2848 const typename_info *const t2 = (const typename_info *) k2;
2850 return (DECL_NAME (TYPE_NAME (t1)) == t2->name
2851 && TYPE_CONTEXT (t1) == t2->scope
2852 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
2853 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
2854 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
2857 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
2858 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
2860 Returns the new TYPENAME_TYPE. */
2862 static GTY ((param_is (union tree_node))) htab_t typename_htab;
2865 build_typename_type (tree context, tree name, tree fullname,
2866 enum tag_types tag_type)
2874 if (typename_htab == NULL)
2875 typename_htab = htab_create_ggc (61, &typename_hash,
2876 &typename_compare, NULL);
2878 ti.scope = FROB_CONTEXT (context);
2880 ti.template_id = fullname;
2881 ti.enum_p = tag_type == enum_type;
2882 ti.class_p = (tag_type == class_type
2883 || tag_type == record_type
2884 || tag_type == union_type);
2885 hash = (htab_hash_pointer (ti.scope)
2886 ^ htab_hash_pointer (ti.name));
2888 /* See if we already have this type. */
2889 e = htab_find_slot_with_hash (typename_htab, &ti, hash, INSERT);
2894 /* Build the TYPENAME_TYPE. */
2895 t = make_aggr_type (TYPENAME_TYPE);
2896 TYPE_CONTEXT (t) = ti.scope;
2897 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
2898 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
2899 TYPENAME_IS_CLASS_P (t) = ti.class_p;
2901 /* Build the corresponding TYPE_DECL. */
2902 d = build_decl (TYPE_DECL, name, t);
2903 TYPE_NAME (TREE_TYPE (d)) = d;
2904 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
2905 DECL_CONTEXT (d) = FROB_CONTEXT (context);
2906 DECL_ARTIFICIAL (d) = 1;
2908 /* Store it in the hash table. */
2911 /* TYPENAME_TYPEs must always be compared structurally, because
2912 they may or may not resolve down to another type depending on
2913 the currently open classes. */
2914 SET_TYPE_STRUCTURAL_EQUALITY (t);
2920 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
2921 provided to name the type. Returns an appropriate type, unless an
2922 error occurs, in which case error_mark_node is returned. If we
2923 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
2924 return that, rather than the _TYPE it corresponds to, in other
2925 cases we look through the type decl. If TF_ERROR is set, complain
2926 about errors, otherwise be quiet. */
2929 make_typename_type (tree context, tree name, enum tag_types tag_type,
2930 tsubst_flags_t complain)
2936 if (name == error_mark_node
2937 || context == NULL_TREE
2938 || context == error_mark_node)
2939 return error_mark_node;
2943 if (!(TYPE_LANG_SPECIFIC (name)
2944 && (CLASSTYPE_IS_TEMPLATE (name)
2945 || CLASSTYPE_USE_TEMPLATE (name))))
2946 name = TYPE_IDENTIFIER (name);
2948 /* Create a TEMPLATE_ID_EXPR for the type. */
2949 name = build_nt (TEMPLATE_ID_EXPR,
2950 CLASSTYPE_TI_TEMPLATE (name),
2951 CLASSTYPE_TI_ARGS (name));
2953 else if (TREE_CODE (name) == TYPE_DECL)
2954 name = DECL_NAME (name);
2958 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
2960 name = TREE_OPERAND (name, 0);
2961 if (TREE_CODE (name) == TEMPLATE_DECL)
2962 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
2963 else if (TREE_CODE (name) == OVERLOAD)
2965 error ("%qD is not a type", name);
2966 return error_mark_node;
2969 if (TREE_CODE (name) == TEMPLATE_DECL)
2971 error ("%qD used without template parameters", name);
2972 return error_mark_node;
2974 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
2975 gcc_assert (TYPE_P (context));
2977 /* When the CONTEXT is a dependent type, NAME could refer to a
2978 dependent base class of CONTEXT. So we cannot peek inside it,
2979 even if CONTEXT is a currently open scope. */
2980 if (dependent_type_p (context))
2981 return build_typename_type (context, name, fullname, tag_type);
2983 if (!IS_AGGR_TYPE (context))
2985 if (complain & tf_error)
2986 error ("%q#T is not a class", context);
2987 return error_mark_node;
2990 want_template = TREE_CODE (fullname) == TEMPLATE_ID_EXPR;
2992 /* We should only set WANT_TYPE when we're a nested typename type.
2993 Then we can give better diagnostics if we find a non-type. */
2994 t = lookup_field (context, name, 0, /*want_type=*/true);
2997 if (complain & tf_error)
2998 error (want_template ? "no class template named %q#T in %q#T"
2999 : "no type named %q#T in %q#T", name, context);
3000 return error_mark_node;
3003 if (want_template && !DECL_CLASS_TEMPLATE_P (t))
3005 if (complain & tf_error)
3006 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3008 return error_mark_node;
3010 if (!want_template && TREE_CODE (t) != TYPE_DECL)
3012 if (complain & tf_error)
3013 error ("%<typename %T::%D%> names %q#T, which is not a type",
3015 return error_mark_node;
3018 if (complain & tf_error)
3019 perform_or_defer_access_check (TYPE_BINFO (context), t, t);
3022 return lookup_template_class (t, TREE_OPERAND (fullname, 1),
3024 /*entering_scope=*/0,
3025 tf_warning_or_error | tf_user);
3027 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
3033 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3034 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3035 in which case error_mark_node is returned.
3037 If PARM_LIST is non-NULL, also make sure that the template parameter
3038 list of TEMPLATE_DECL matches.
3040 If COMPLAIN zero, don't complain about any errors that occur. */
3043 make_unbound_class_template (tree context, tree name, tree parm_list,
3044 tsubst_flags_t complain)
3050 name = TYPE_IDENTIFIER (name);
3051 else if (DECL_P (name))
3052 name = DECL_NAME (name);
3053 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3055 if (!dependent_type_p (context)
3056 || currently_open_class (context))
3058 tree tmpl = NULL_TREE;
3060 if (IS_AGGR_TYPE (context))
3061 tmpl = lookup_field (context, name, 0, false);
3063 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
3065 if (complain & tf_error)
3066 error ("no class template named %q#T in %q#T", name, context);
3067 return error_mark_node;
3071 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
3073 if (complain & tf_error)
3075 error ("template parameters do not match template");
3076 error ("%q+D declared here", tmpl);
3078 return error_mark_node;
3081 if (complain & tf_error)
3082 perform_or_defer_access_check (TYPE_BINFO (context), tmpl, tmpl);
3087 /* Build the UNBOUND_CLASS_TEMPLATE. */
3088 t = make_aggr_type (UNBOUND_CLASS_TEMPLATE);
3089 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
3090 TREE_TYPE (t) = NULL_TREE;
3091 SET_TYPE_STRUCTURAL_EQUALITY (t);
3093 /* Build the corresponding TEMPLATE_DECL. */
3094 d = build_decl (TEMPLATE_DECL, name, t);
3095 TYPE_NAME (TREE_TYPE (d)) = d;
3096 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3097 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3098 DECL_ARTIFICIAL (d) = 1;
3099 DECL_TEMPLATE_PARMS (d) = parm_list;
3106 /* Push the declarations of builtin types into the namespace.
3107 RID_INDEX is the index of the builtin type in the array
3108 RID_POINTERS. NAME is the name used when looking up the builtin
3109 type. TYPE is the _TYPE node for the builtin type. */
3112 record_builtin_type (enum rid rid_index,
3116 tree rname = NULL_TREE, tname = NULL_TREE;
3117 tree tdecl = NULL_TREE;
3119 if ((int) rid_index < (int) RID_MAX)
3120 rname = ridpointers[(int) rid_index];
3122 tname = get_identifier (name);
3124 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
3125 eliminated. Built-in types should not be looked up name; their
3126 names are keywords that the parser can recognize. However, there
3127 is code in c-common.c that uses identifier_global_value to look
3128 up built-in types by name. */
3131 tdecl = build_decl (TYPE_DECL, tname, type);
3132 DECL_ARTIFICIAL (tdecl) = 1;
3133 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
3139 tdecl = build_decl (TYPE_DECL, rname, type);
3140 DECL_ARTIFICIAL (tdecl) = 1;
3142 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
3145 if (!TYPE_NAME (type))
3146 TYPE_NAME (type) = tdecl;
3149 debug_hooks->type_decl (tdecl, 0);
3152 /* Record one of the standard Java types.
3153 * Declare it as having the given NAME.
3154 * If SIZE > 0, it is the size of one of the integral types;
3155 * otherwise it is the negative of the size of one of the other types. */
3158 record_builtin_java_type (const char* name, int size)
3162 type = make_signed_type (size);
3163 else if (size == -1)
3164 { /* "__java_boolean". */
3165 if ((TYPE_MODE (boolean_type_node)
3166 == smallest_mode_for_size (1, MODE_INT)))
3167 type = build_variant_type_copy (boolean_type_node);
3169 /* ppc-darwin has SImode bool, make jboolean a 1-bit
3170 integer type without boolean semantics there. */
3171 type = make_unsigned_type (1);
3173 else if (size > -32)
3174 { /* "__java_char". */
3175 type = make_unsigned_type (-size);
3178 { /* "__java_float" or ""__java_double". */
3179 type = make_node (REAL_TYPE);
3180 TYPE_PRECISION (type) = - size;
3183 record_builtin_type (RID_MAX, name, type);
3184 decl = TYPE_NAME (type);
3186 /* Suppress generate debug symbol entries for these types,
3187 since for normal C++ they are just clutter.
3188 However, push_lang_context undoes this if extern "Java" is seen. */
3189 DECL_IGNORED_P (decl) = 1;
3191 TYPE_FOR_JAVA (type) = 1;
3195 /* Push a type into the namespace so that the back ends ignore it. */
3198 record_unknown_type (tree type, const char* name)
3200 tree decl = pushdecl (build_decl (TYPE_DECL, get_identifier (name), type));
3201 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3202 DECL_IGNORED_P (decl) = 1;
3203 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
3204 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
3205 TYPE_ALIGN (type) = 1;
3206 TYPE_USER_ALIGN (type) = 0;
3207 TYPE_MODE (type) = TYPE_MODE (void_type_node);
3210 /* A string for which we should create an IDENTIFIER_NODE at
3213 typedef struct predefined_identifier
3215 /* The name of the identifier. */
3216 const char *const name;
3217 /* The place where the IDENTIFIER_NODE should be stored. */
3219 /* Nonzero if this is the name of a constructor or destructor. */
3220 const int ctor_or_dtor_p;
3221 } predefined_identifier;
3223 /* Create all the predefined identifiers. */
3226 initialize_predefined_identifiers (void)
3228 const predefined_identifier *pid;
3230 /* A table of identifiers to create at startup. */
3231 static const predefined_identifier predefined_identifiers[] = {
3232 { "C++", &lang_name_cplusplus, 0 },
3233 { "C", &lang_name_c, 0 },
3234 { "Java", &lang_name_java, 0 },
3235 /* Some of these names have a trailing space so that it is
3236 impossible for them to conflict with names written by users. */
3237 { "__ct ", &ctor_identifier, 1 },
3238 { "__base_ctor ", &base_ctor_identifier, 1 },
3239 { "__comp_ctor ", &complete_ctor_identifier, 1 },
3240 { "__dt ", &dtor_identifier, 1 },
3241 { "__comp_dtor ", &complete_dtor_identifier, 1 },
3242 { "__base_dtor ", &base_dtor_identifier, 1 },
3243 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
3244 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
3245 { "nelts", &nelts_identifier, 0 },
3246 { THIS_NAME, &this_identifier, 0 },
3247 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
3248 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
3249 { "_vptr", &vptr_identifier, 0 },
3250 { "__vtt_parm", &vtt_parm_identifier, 0 },
3251 { "::", &global_scope_name, 0 },
3252 { "std", &std_identifier, 0 },
3256 for (pid = predefined_identifiers; pid->name; ++pid)
3258 *pid->node = get_identifier (pid->name);
3259 if (pid->ctor_or_dtor_p)
3260 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
3264 /* Create the predefined scalar types of C,
3265 and some nodes representing standard constants (0, 1, (void *)0).
3266 Initialize the global binding level.
3267 Make definitions for built-in primitive functions. */
3270 cxx_init_decl_processing (void)
3273 tree void_ftype_ptr;
3275 build_common_tree_nodes (flag_signed_char, false);
3277 /* Create all the identifiers we need. */
3278 initialize_predefined_identifiers ();
3280 /* Create the global variables. */
3281 push_to_top_level ();
3283 current_function_decl = NULL_TREE;
3284 current_binding_level = NULL;
3285 /* Enter the global namespace. */
3286 gcc_assert (global_namespace == NULL_TREE);
3287 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
3289 TREE_PUBLIC (global_namespace) = 1;
3290 begin_scope (sk_namespace, global_namespace);
3292 current_lang_name = NULL_TREE;
3294 if (flag_visibility_ms_compat)
3295 default_visibility = VISIBILITY_HIDDEN;
3298 current_lang_name = lang_name_c;
3300 /* Create the `std' namespace. */
3301 push_namespace (std_identifier);
3302 std_node = current_namespace;
3305 c_common_nodes_and_builtins ();
3307 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
3308 java_short_type_node = record_builtin_java_type ("__java_short", 16);
3309 java_int_type_node = record_builtin_java_type ("__java_int", 32);
3310 java_long_type_node = record_builtin_java_type ("__java_long", 64);
3311 java_float_type_node = record_builtin_java_type ("__java_float", -32);
3312 java_double_type_node = record_builtin_java_type ("__java_double", -64);
3313 java_char_type_node = record_builtin_java_type ("__java_char", -16);
3314 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
3316 integer_two_node = build_int_cst (NULL_TREE, 2);
3317 integer_three_node = build_int_cst (NULL_TREE, 3);
3319 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
3320 truthvalue_type_node = boolean_type_node;
3321 truthvalue_false_node = boolean_false_node;
3322 truthvalue_true_node = boolean_true_node;
3324 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
3327 record_builtin_type (RID_MAX, NULL, string_type_node);
3330 delta_type_node = ptrdiff_type_node;
3331 vtable_index_type = ptrdiff_type_node;
3333 vtt_parm_type = build_pointer_type (const_ptr_type_node);
3334 void_ftype = build_function_type (void_type_node, void_list_node);
3335 void_ftype_ptr = build_function_type (void_type_node,
3336 tree_cons (NULL_TREE,
3340 = build_exception_variant (void_ftype_ptr, empty_except_spec);
3342 /* C++ extensions */
3344 unknown_type_node = make_node (UNKNOWN_TYPE);
3345 record_unknown_type (unknown_type_node, "unknown type");
3347 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3348 TREE_TYPE (unknown_type_node) = unknown_type_node;
3350 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3352 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
3353 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
3356 /* Make sure we get a unique function type, so we can give
3357 its pointer type a name. (This wins for gdb.) */
3358 tree vfunc_type = make_node (FUNCTION_TYPE);
3359 TREE_TYPE (vfunc_type) = integer_type_node;
3360 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
3361 layout_type (vfunc_type);
3363 vtable_entry_type = build_pointer_type (vfunc_type);
3365 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
3368 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
3369 layout_type (vtbl_type_node);
3370 vtbl_type_node = build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
3371 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
3372 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
3373 layout_type (vtbl_ptr_type_node);
3374 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
3376 push_namespace (get_identifier ("__cxxabiv1"));
3377 abi_node = current_namespace;
3380 global_type_node = make_node (LANG_TYPE);
3381 record_unknown_type (global_type_node, "global type");
3384 current_lang_name = lang_name_cplusplus;
3388 tree bad_alloc_type_node;
3389 tree bad_alloc_decl;
3390 tree newtype, deltype;
3391 tree ptr_ftype_sizetype;
3393 push_namespace (std_identifier);
3394 bad_alloc_id = get_identifier ("bad_alloc");
3395 bad_alloc_type_node = make_aggr_type (RECORD_TYPE);
3396 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3398 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3399 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3400 TYPE_STUB_DECL (bad_alloc_type_node) = bad_alloc_decl;
3404 = build_function_type (ptr_type_node,
3405 tree_cons (NULL_TREE,
3408 newtype = build_exception_variant
3409 (ptr_ftype_sizetype, add_exception_specifier
3410 (NULL_TREE, bad_alloc_type_node, -1));
3411 deltype = build_exception_variant (void_ftype_ptr, empty_except_spec);
3412 push_cp_library_fn (NEW_EXPR, newtype);
3413 push_cp_library_fn (VEC_NEW_EXPR, newtype);
3414 global_delete_fndecl = push_cp_library_fn (DELETE_EXPR, deltype);
3415 push_cp_library_fn (VEC_DELETE_EXPR, deltype);
3419 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype);
3421 /* Perform other language dependent initializations. */
3422 init_class_processing ();
3423 init_rtti_processing ();
3425 if (flag_exceptions)
3426 init_exception_processing ();
3428 if (! supports_one_only ())
3431 make_fname_decl = cp_make_fname_decl;
3432 start_fname_decls ();
3434 /* Show we use EH for cleanups. */
3435 if (flag_exceptions)
3436 using_eh_for_cleanups ();
3439 /* Generate an initializer for a function naming variable from
3440 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
3441 filled in with the type of the init. */
3444 cp_fname_init (const char* name, tree *type_p)
3446 tree domain = NULL_TREE;
3448 tree init = NULL_TREE;
3453 length = strlen (name);
3454 domain = build_index_type (size_int (length));
3455 init = build_string (length + 1, name);
3458 type = build_qualified_type (char_type_node, TYPE_QUAL_CONST);
3459 type = build_cplus_array_type (type, domain);
3464 TREE_TYPE (init) = type;
3466 init = error_mark_node;
3471 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
3472 decl, NAME is the initialization string and TYPE_DEP indicates whether
3473 NAME depended on the type of the function. We make use of that to detect
3474 __PRETTY_FUNCTION__ inside a template fn. This is being done
3475 lazily at the point of first use, so we mustn't push the decl now. */
3478 cp_make_fname_decl (tree id, int type_dep)
3480 const char *const name = (type_dep && processing_template_decl
3481 ? NULL : fname_as_string (type_dep));
3483 tree init = cp_fname_init (name, &type);
3484 tree decl = build_decl (VAR_DECL, id, type);
3487 free (CONST_CAST (char *, name));
3489 /* As we're using pushdecl_with_scope, we must set the context. */
3490 DECL_CONTEXT (decl) = current_function_decl;
3491 DECL_PRETTY_FUNCTION_P (decl) = type_dep;
3493 TREE_STATIC (decl) = 1;
3494 TREE_READONLY (decl) = 1;
3495 DECL_ARTIFICIAL (decl) = 1;
3497 TREE_USED (decl) = 1;
3499 if (current_function_decl)
3501 struct cp_binding_level *b = current_binding_level;
3502 while (b->level_chain->kind != sk_function_parms)
3504 pushdecl_with_scope (decl, b, /*is_friend=*/false);
3505 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, NULL_TREE,
3506 LOOKUP_ONLYCONVERTING);
3509 pushdecl_top_level_and_finish (decl, init);
3515 builtin_function_1 (tree decl, tree context)
3517 tree id = DECL_NAME (decl);
3518 const char *name = IDENTIFIER_POINTER (id);
3520 retrofit_lang_decl (decl);
3522 /* All nesting of C++ functions is lexical; there is never a "static
3523 chain" in the sense of GNU C nested functions. */
3524 DECL_NO_STATIC_CHAIN (decl) = 1;
3526 DECL_ARTIFICIAL (decl) = 1;
3527 SET_OVERLOADED_OPERATOR_CODE (decl, ERROR_MARK);
3528 SET_DECL_LANGUAGE (decl, lang_c);
3529 /* Runtime library routines are, by definition, available in an
3530 external shared object. */
3531 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
3532 DECL_VISIBILITY_SPECIFIED (decl) = 1;
3534 DECL_CONTEXT (decl) = context;
3538 /* A function in the user's namespace should have an explicit
3539 declaration before it is used. Mark the built-in function as
3540 anticipated but not actually declared. */
3541 if (name[0] != '_' || name[1] != '_')
3542 DECL_ANTICIPATED (decl) = 1;
3543 else if (strncmp (name + 2, "builtin_", strlen ("builtin_")) != 0)
3545 size_t len = strlen (name);
3547 /* Treat __*_chk fortification functions as anticipated as well,
3548 unless they are __builtin_*. */
3549 if (len > strlen ("___chk")
3550 && memcmp (name + len - strlen ("_chk"),
3551 "_chk", strlen ("_chk") + 1) == 0)
3552 DECL_ANTICIPATED (decl) = 1;
3559 cxx_builtin_function (tree decl)
3561 tree id = DECL_NAME (decl);
3562 const char *name = IDENTIFIER_POINTER (id);
3563 /* All builtins that don't begin with an '_' should additionally
3564 go in the 'std' namespace. */
3567 tree decl2 = copy_node(decl);
3568 push_namespace (std_identifier);
3569 builtin_function_1 (decl2, std_node);
3573 return builtin_function_1 (decl, NULL_TREE);
3576 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
3577 function. Not called directly. */
3580 build_library_fn_1 (tree name, enum tree_code operator_code, tree type)
3582 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
3583 DECL_EXTERNAL (fn) = 1;
3584 TREE_PUBLIC (fn) = 1;
3585 DECL_ARTIFICIAL (fn) = 1;
3586 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
3587 SET_DECL_LANGUAGE (fn, lang_c);
3588 /* Runtime library routines are, by definition, available in an
3589 external shared object. */
3590 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
3591 DECL_VISIBILITY_SPECIFIED (fn) = 1;
3595 /* Returns the _DECL for a library function with C linkage.
3596 We assume that such functions never throw; if this is incorrect,
3597 callers should unset TREE_NOTHROW. */
3600 build_library_fn (tree name, tree type)
3602 tree fn = build_library_fn_1 (name, ERROR_MARK, type);
3603 TREE_NOTHROW (fn) = 1;
3607 /* Returns the _DECL for a library function with C++ linkage. */
3610 build_cp_library_fn (tree name, enum tree_code operator_code, tree type)
3612 tree fn = build_library_fn_1 (name, operator_code, type);
3613 TREE_NOTHROW (fn) = TYPE_NOTHROW_P (type);
3614 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
3615 SET_DECL_LANGUAGE (fn, lang_cplusplus);
3619 /* Like build_library_fn, but takes a C string instead of an
3623 build_library_fn_ptr (const char* name, tree type)
3625 return build_library_fn (get_identifier (name), type);
3628 /* Like build_cp_library_fn, but takes a C string instead of an
3632 build_cp_library_fn_ptr (const char* name, tree type)
3634 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type);
3637 /* Like build_library_fn, but also pushes the function so that we will
3638 be able to find it via IDENTIFIER_GLOBAL_VALUE. */
3641 push_library_fn (tree name, tree type)
3643 tree fn = build_library_fn (name, type);
3644 pushdecl_top_level (fn);
3648 /* Like build_cp_library_fn, but also pushes the function so that it
3649 will be found by normal lookup. */
3652 push_cp_library_fn (enum tree_code operator_code, tree type)
3654 tree fn = build_cp_library_fn (ansi_opname (operator_code),
3661 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
3665 push_void_library_fn (tree name, tree parmtypes)
3667 tree type = build_function_type (void_type_node, parmtypes);
3668 return push_library_fn (name, type);
3671 /* Like push_library_fn, but also note that this function throws
3672 and does not return. Used for __throw_foo and the like. */
3675 push_throw_library_fn (tree name, tree type)
3677 tree fn = push_library_fn (name, type);
3678 TREE_THIS_VOLATILE (fn) = 1;
3679 TREE_NOTHROW (fn) = 0;
3683 /* When we call finish_struct for an anonymous union, we create
3684 default copy constructors and such. But, an anonymous union
3685 shouldn't have such things; this function undoes the damage to the
3686 anonymous union type T.
3688 (The reason that we create the synthesized methods is that we don't
3689 distinguish `union { int i; }' from `typedef union { int i; } U'.
3690 The first is an anonymous union; the second is just an ordinary
3694 fixup_anonymous_aggr (tree t)
3698 /* Wipe out memory of synthesized methods. */
3699 TYPE_HAS_USER_CONSTRUCTOR (t) = 0;
3700 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
3701 TYPE_HAS_INIT_REF (t) = 0;
3702 TYPE_HAS_CONST_INIT_REF (t) = 0;
3703 TYPE_HAS_ASSIGN_REF (t) = 0;
3704 TYPE_HAS_CONST_ASSIGN_REF (t) = 0;
3706 /* Splice the implicitly generated functions out of the TYPE_METHODS
3708 q = &TYPE_METHODS (t);
3711 if (DECL_ARTIFICIAL (*q))
3712 *q = TREE_CHAIN (*q);
3714 q = &TREE_CHAIN (*q);
3717 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
3718 if (TYPE_METHODS (t))
3720 tree decl = TYPE_MAIN_DECL (t);
3722 if (TREE_CODE (t) != UNION_TYPE)
3723 error ("%Jan anonymous struct cannot have function members", decl);
3725 error ("%Jan anonymous union cannot have function members", decl);
3728 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
3729 assignment operators (because they cannot have these methods themselves).
3730 For anonymous unions this is already checked because they are not allowed
3731 in any union, otherwise we have to check it. */
3732 if (TREE_CODE (t) != UNION_TYPE)
3736 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
3737 if (TREE_CODE (field) == FIELD_DECL)
3739 type = TREE_TYPE (field);
3740 if (CLASS_TYPE_P (type))
3742 if (TYPE_NEEDS_CONSTRUCTING (type))
3743 error ("member %q+#D with constructor not allowed "
3744 "in anonymous aggregate", field);
3745 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
3746 error ("member %q+#D with destructor not allowed "
3747 "in anonymous aggregate", field);
3748 if (TYPE_HAS_COMPLEX_ASSIGN_REF (type))
3749 error ("member %q+#D with copy assignment operator "
3750 "not allowed in anonymous aggregate", field);
3756 /* Make sure that a declaration with no declarator is well-formed, i.e.
3757 just declares a tagged type or anonymous union.
3759 Returns the type declared; or NULL_TREE if none. */
3762 check_tag_decl (cp_decl_specifier_seq *declspecs)
3764 int saw_friend = declspecs->specs[(int)ds_friend] != 0;
3765 int saw_typedef = declspecs->specs[(int)ds_typedef] != 0;
3766 /* If a class, struct, or enum type is declared by the DECLSPECS
3767 (i.e, if a class-specifier, enum-specifier, or non-typename
3768 elaborated-type-specifier appears in the DECLSPECS),
3769 DECLARED_TYPE is set to the corresponding type. */
3770 tree declared_type = NULL_TREE;
3771 bool error_p = false;
3773 if (declspecs->multiple_types_p)
3774 error ("multiple types in one declaration");
3775 else if (declspecs->redefined_builtin_type)
3777 if (!in_system_header)
3778 pedwarn ("redeclaration of C++ built-in type %qT",
3779 declspecs->redefined_builtin_type);
3784 && TYPE_P (declspecs->type)
3785 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
3786 && IS_AGGR_TYPE (declspecs->type))
3787 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
3788 declared_type = declspecs->type;
3789 else if (declspecs->type == error_mark_node)
3791 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
3792 pedwarn ("declaration does not declare anything");
3793 /* Check for an anonymous union. */
3794 else if (declared_type && IS_AGGR_TYPE_CODE (TREE_CODE (declared_type))
3795 && TYPE_ANONYMOUS_P (declared_type))
3797 /* 7/3 In a simple-declaration, the optional init-declarator-list
3798 can be omitted only when declaring a class (clause 9) or
3799 enumeration (7.2), that is, when the decl-specifier-seq contains
3800 either a class-specifier, an elaborated-type-specifier with
3801 a class-key (9.1), or an enum-specifier. In these cases and
3802 whenever a class-specifier or enum-specifier is present in the
3803 decl-specifier-seq, the identifiers in these specifiers are among
3804 the names being declared by the declaration (as class-name,
3805 enum-names, or enumerators, depending on the syntax). In such
3806 cases, and except for the declaration of an unnamed bit-field (9.6),
3807 the decl-specifier-seq shall introduce one or more names into the
3808 program, or shall redeclare a name introduced by a previous
3809 declaration. [Example:
3810 enum { }; // ill-formed
3811 typedef class { }; // ill-formed
3815 error ("missing type-name in typedef-declaration");
3818 /* Anonymous unions are objects, so they can have specifiers. */;
3819 SET_ANON_AGGR_TYPE_P (declared_type);
3821 if (TREE_CODE (declared_type) != UNION_TYPE && pedantic
3822 && !in_system_header)
3823 pedwarn ("ISO C++ prohibits anonymous structs");
3828 if (declspecs->specs[(int)ds_inline]
3829 || declspecs->specs[(int)ds_virtual])
3830 error ("%qs can only be specified for functions",
3831 declspecs->specs[(int)ds_inline]
3832 ? "inline" : "virtual");
3834 && (!current_class_type
3835 || current_scope () != current_class_type))
3836 error ("%<friend%> can only be specified inside a class");
3837 else if (declspecs->specs[(int)ds_explicit])
3838 error ("%<explicit%> can only be specified for constructors");
3839 else if (declspecs->storage_class)
3840 error ("a storage class can only be specified for objects "
3842 else if (declspecs->specs[(int)ds_const]
3843 || declspecs->specs[(int)ds_volatile]
3844 || declspecs->specs[(int)ds_restrict]
3845 || declspecs->specs[(int)ds_thread])
3846 error ("qualifiers can only be specified for objects "
3848 else if (saw_typedef)
3849 warning (0, "%<typedef%> was ignored in this declaration");
3852 return declared_type;
3855 /* Called when a declaration is seen that contains no names to declare.
3856 If its type is a reference to a structure, union or enum inherited
3857 from a containing scope, shadow that tag name for the current scope
3858 with a forward reference.
3859 If its type defines a new named structure or union
3860 or defines an enum, it is valid but we need not do anything here.
3861 Otherwise, it is an error.
3863 C++: may have to grok the declspecs to learn about static,
3864 complain for anonymous unions.
3866 Returns the TYPE declared -- or NULL_TREE if none. */
3869 shadow_tag (cp_decl_specifier_seq *declspecs)
3871 tree t = check_tag_decl (declspecs);
3876 if (declspecs->attributes)
3878 warning (0, "attribute ignored in declaration of %q+#T", t);
3879 warning (0, "attribute for %q+#T must follow the %qs keyword",
3880 t, class_key_or_enum_as_string (t));
3884 if (maybe_process_partial_specialization (t) == error_mark_node)
3887 /* This is where the variables in an anonymous union are
3888 declared. An anonymous union declaration looks like:
3890 because there is no declarator after the union, the parser
3891 sends that declaration here. */
3892 if (ANON_AGGR_TYPE_P (t))
3894 fixup_anonymous_aggr (t);
3896 if (TYPE_FIELDS (t))
3898 tree decl = grokdeclarator (/*declarator=*/NULL,
3899 declspecs, NORMAL, 0, NULL);
3900 finish_anon_union (decl);
3907 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3910 groktypename (cp_decl_specifier_seq *type_specifiers,
3911 const cp_declarator *declarator)
3915 attrs = type_specifiers->attributes;
3916 type_specifiers->attributes = NULL_TREE;
3917 type = grokdeclarator (declarator, type_specifiers, TYPENAME, 0, &attrs);
3918 if (attrs && type != error_mark_node)
3920 if (CLASS_TYPE_P (type))
3921 warning (OPT_Wattributes, "ignoring attributes applied to class type %qT "
3922 "outside of definition", type);
3923 else if (IS_AGGR_TYPE (type))
3924 /* A template type parameter or other dependent type. */
3925 warning (OPT_Wattributes, "ignoring attributes applied to dependent "
3926 "type %qT without an associated declaration", type);
3928 cplus_decl_attributes (&type, attrs, 0);
3933 /* Process a DECLARATOR for a function-scope variable declaration,
3934 namespace-scope variable declaration, or function declaration.
3935 (Function definitions go through start_function; class member
3936 declarations appearing in the body of the class go through
3937 grokfield.) The DECL corresponding to the DECLARATOR is returned.
3938 If an error occurs, the error_mark_node is returned instead.
3940 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED
3941 is true if an explicit initializer is present, but false if this is
3942 a variable implicitly initialized via a default constructor.
3943 ATTRIBUTES and PREFIX_ATTRIBUTES are GNU attributes associated with
3944 this declaration. *PUSHED_SCOPE_P is set to the scope entered in
3945 this function, if any; if set, the caller is responsible for
3946 calling pop_scope. */
3949 start_decl (const cp_declarator *declarator,
3950 cp_decl_specifier_seq *declspecs,
3953 tree prefix_attributes,
3954 tree *pushed_scope_p)
3961 *pushed_scope_p = NULL_TREE;
3963 /* An object declared as __attribute__((deprecated)) suppresses
3964 warnings of uses of other deprecated items. */
3965 if (lookup_attribute ("deprecated", attributes))
3966 deprecated_state = DEPRECATED_SUPPRESS;
3968 attributes = chainon (attributes, prefix_attributes);
3970 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
3973 deprecated_state = DEPRECATED_NORMAL;
3975 if (decl == NULL_TREE || TREE_CODE (decl) == VOID_TYPE
3976 || decl == error_mark_node)
3977 return error_mark_node;
3979 type = TREE_TYPE (decl);
3981 context = DECL_CONTEXT (decl);
3985 *pushed_scope_p = push_scope (context);
3987 /* We are only interested in class contexts, later. */
3988 if (TREE_CODE (context) == NAMESPACE_DECL)
3989 context = NULL_TREE;
3993 /* Is it valid for this decl to have an initializer at all?
3994 If not, set INITIALIZED to zero, which will indirectly
3995 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
3996 switch (TREE_CODE (decl))
3999 error ("typedef %qD is initialized (use __typeof__ instead)", decl);
4000 return error_mark_node;
4003 error ("function %q#D is initialized like a variable", decl);
4004 return error_mark_node;
4012 if (! toplevel_bindings_p ()
4013 && DECL_EXTERNAL (decl))
4014 warning (0, "declaration of %q#D has %<extern%> and is initialized",
4016 DECL_EXTERNAL (decl) = 0;
4017 if (toplevel_bindings_p ())
4018 TREE_STATIC (decl) = 1;
4021 /* Set attributes here so if duplicate decl, will have proper attributes. */
4022 cplus_decl_attributes (&decl, attributes, 0);
4024 /* Dllimported symbols cannot be defined. Static data members (which
4025 can be initialized in-class and dllimported) go through grokfield,
4026 not here, so we don't need to exclude those decls when checking for
4028 if (initialized && DECL_DLLIMPORT_P (decl))
4030 error ("definition of %q#D is marked %<dllimport%>", decl);
4031 DECL_DLLIMPORT_P (decl) = 0;
4034 /* If #pragma weak was used, mark the decl weak now. */
4035 maybe_apply_pragma_weak (decl);
4037 if (TREE_CODE (decl) == FUNCTION_DECL
4038 && DECL_DECLARED_INLINE_P (decl)
4039 && DECL_UNINLINABLE (decl)
4040 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4041 warning (0, "inline function %q+D given attribute noinline", decl);
4043 if (context && COMPLETE_TYPE_P (complete_type (context)))
4045 if (TREE_CODE (decl) == VAR_DECL)
4047 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
4048 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
4049 error ("%q#D is not a static member of %q#T", decl, context);
4052 if (DECL_CONTEXT (field) != context)
4054 if (!same_type_p (DECL_CONTEXT (field), context))
4055 pedwarn ("ISO C++ does not permit %<%T::%D%> "
4056 "to be defined as %<%T::%D%>",
4057 DECL_CONTEXT (field), DECL_NAME (decl),
4058 context, DECL_NAME (decl));
4059 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
4061 if (processing_specialization
4062 && template_class_depth (context) == 0
4063 && CLASSTYPE_TEMPLATE_SPECIALIZATION (context))
4064 error ("template header not allowed in member definition "
4065 "of explicitly specialized class");
4066 /* Static data member are tricky; an in-class initialization
4067 still doesn't provide a definition, so the in-class
4068 declaration will have DECL_EXTERNAL set, but will have an
4069 initialization. Thus, duplicate_decls won't warn
4070 about this situation, and so we check here. */
4071 if (initialized && DECL_INITIALIZED_IN_CLASS_P (field))
4072 error ("duplicate initialization of %qD", decl);
4073 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
4079 tree field = check_classfn (context, decl,
4080 (processing_template_decl
4081 > template_class_depth (context))
4082 ? current_template_parms
4084 if (field && field != error_mark_node
4085 && duplicate_decls (decl, field,
4086 /*newdecl_is_friend=*/false))
4090 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
4091 DECL_IN_AGGR_P (decl) = 0;
4092 /* Do not mark DECL as an explicit specialization if it was not
4093 already marked as an instantiation; a declaration should
4094 never be marked as a specialization unless we know what
4095 template is being specialized. */
4096 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
4098 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
4100 /* [temp.expl.spec] An explicit specialization of a static data
4101 member of a template is a definition if the declaration
4102 includes an initializer; otherwise, it is a declaration.
4104 We check for processing_specialization so this only applies
4105 to the new specialization syntax. */
4106 if (!initialized && processing_specialization)
4107 DECL_EXTERNAL (decl) = 1;
4110 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl))
4111 pedwarn ("declaration of %q#D outside of class is not definition",
4115 was_public = TREE_PUBLIC (decl);
4117 /* Enter this declaration into the symbol table. */
4118 decl = maybe_push_decl (decl);
4120 if (processing_template_decl)
4121 decl = push_template_decl (decl);
4122 if (decl == error_mark_node)
4123 return error_mark_node;
4125 /* Tell the back end to use or not use .common as appropriate. If we say
4126 -fconserve-space, we want this to save .data space, at the expense of
4127 wrong semantics. If we say -fno-conserve-space, we want this to
4128 produce errors about redefs; to do this we force variables into the
4130 if (flag_conserve_space
4131 && TREE_CODE (decl) == VAR_DECL
4132 && TREE_PUBLIC (decl)
4133 && !DECL_THREAD_LOCAL_P (decl)
4134 && !have_global_bss_p ())
4135 DECL_COMMON (decl) = 1;
4137 if (TREE_CODE (decl) == VAR_DECL
4138 && DECL_NAMESPACE_SCOPE_P (decl) && !TREE_PUBLIC (decl) && !was_public
4139 && !DECL_THIS_STATIC (decl) && !DECL_ARTIFICIAL (decl))
4141 /* This is a const variable with implicit 'static'. Set
4142 DECL_THIS_STATIC so we can tell it from variables that are
4143 !TREE_PUBLIC because of the anonymous namespace. */
4144 gcc_assert (cp_type_readonly (TREE_TYPE (decl)));
4145 DECL_THIS_STATIC (decl) = 1;
4148 if (!processing_template_decl && TREE_CODE (decl) == VAR_DECL)
4149 start_decl_1 (decl, initialized);
4154 /* Process the declaration of a variable DECL. INITIALIZED is true
4155 iff DECL is explicitly initialized. (INITIALIZED is false if the
4156 variable is initialized via an implicitly-called constructor.)
4157 This function must be called for ordinary variables (including, for
4158 example, implicit instantiations of templates), but must not be
4159 called for template declarations. */
4162 start_decl_1 (tree decl, bool initialized)
4166 bool aggregate_definition_p;
4168 gcc_assert (!processing_template_decl);
4170 if (error_operand_p (decl))
4173 gcc_assert (TREE_CODE (decl) == VAR_DECL);
4175 type = TREE_TYPE (decl);
4176 complete_p = COMPLETE_TYPE_P (type);
4177 aggregate_definition_p = IS_AGGR_TYPE (type) && !DECL_EXTERNAL (decl);
4179 /* If an explicit initializer is present, or if this is a definition
4180 of an aggregate, then we need a complete type at this point.
4181 (Scalars are always complete types, so there is nothing to
4182 check.) This code just sets COMPLETE_P; errors (if necessary)
4183 are issued below. */
4184 if ((initialized || aggregate_definition_p)
4186 && COMPLETE_TYPE_P (complete_type (type)))
4189 /* We will not yet have set TREE_READONLY on DECL if the type
4190 was "const", but incomplete, before this point. But, now, we
4191 have a complete type, so we can try again. */
4192 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
4196 /* Is it valid for this decl to have an initializer at all? */
4198 /* Don't allow initializations for incomplete types except for
4199 arrays which might be completed by the initialization. */
4201 ; /* A complete type is ok. */
4202 else if (TREE_CODE (type) != ARRAY_TYPE)
4204 error ("variable %q#D has initializer but incomplete type", decl);
4205 type = TREE_TYPE (decl) = error_mark_node;
4207 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4209 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
4210 error ("elements of array %q#D have incomplete type", decl);
4211 /* else we already gave an error in start_decl. */
4214 else if (aggregate_definition_p && !complete_p)
4216 error ("aggregate %q#D has incomplete type and cannot be defined",
4218 /* Change the type so that assemble_variable will give
4219 DECL an rtl we can live with: (mem (const_int 0)). */
4220 type = TREE_TYPE (decl) = error_mark_node;
4223 /* Create a new scope to hold this declaration if necessary.
4224 Whether or not a new scope is necessary cannot be determined
4225 until after the type has been completed; if the type is a
4226 specialization of a class template it is not until after
4227 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
4228 will be set correctly. */
4229 maybe_push_cleanup_level (type);
4232 /* Handle initialization of references. DECL, TYPE, and INIT have the
4233 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
4234 but will be set to a new CLEANUP_STMT if a temporary is created
4235 that must be destroyed subsequently.
4237 Returns an initializer expression to use to initialize DECL, or
4238 NULL if the initialization can be performed statically.
4240 Quotes on semantics can be found in ARM 8.4.3. */
4243 grok_reference_init (tree decl, tree type, tree init, tree *cleanup)
4247 if (init == NULL_TREE)
4249 if ((DECL_LANG_SPECIFIC (decl) == 0
4250 || DECL_IN_AGGR_P (decl) == 0)
4251 && ! DECL_THIS_EXTERN (decl))
4252 error ("%qD declared as reference but not initialized", decl);
4256 if (TREE_CODE (init) == CONSTRUCTOR)
4258 error ("ISO C++ forbids use of initializer list to "
4259 "initialize reference %qD", decl);
4263 if (TREE_CODE (init) == TREE_LIST)
4264 init = build_x_compound_expr_from_list (init, "initializer");
4266 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
4267 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
4268 /* Note: default conversion is only called in very special cases. */
4269 init = decay_conversion (init);
4271 /* Convert INIT to the reference type TYPE. This may involve the
4272 creation of a temporary, whose lifetime must be the same as that
4273 of the reference. If so, a DECL_EXPR for the temporary will be
4274 added just after the DECL_EXPR for DECL. That's why we don't set
4275 DECL_INITIAL for local references (instead assigning to them
4276 explicitly); we need to allow the temporary to be initialized
4278 tmp = initialize_reference (type, init, decl, cleanup);
4280 if (tmp == error_mark_node)
4282 else if (tmp == NULL_TREE)
4284 error ("cannot initialize %qT from %qT", type, TREE_TYPE (init));
4288 if (TREE_STATIC (decl) && !TREE_CONSTANT (tmp))
4291 DECL_INITIAL (decl) = tmp;
4296 /* Designated initializers in arrays are not supported in GNU C++.
4297 The parser cannot detect this error since it does not know whether
4298 a given brace-enclosed initializer is for a class type or for an
4299 array. This function checks that CE does not use a designated
4300 initializer. If it does, an error is issued. Returns true if CE
4301 is valid, i.e., does not have a designated initializer. */
4304 check_array_designated_initializer (const constructor_elt *ce)
4306 /* Designated initializers for array elements are not supported. */
4309 /* The parser only allows identifiers as designated
4311 gcc_assert (TREE_CODE (ce->index) == IDENTIFIER_NODE);
4312 error ("name %qD used in a GNU-style designated "
4313 "initializer for an array", ce->index);
4320 /* When parsing `int a[] = {1, 2};' we don't know the size of the
4321 array until we finish parsing the initializer. If that's the
4322 situation we're in, update DECL accordingly. */
4325 maybe_deduce_size_from_array_init (tree decl, tree init)
4327 tree type = TREE_TYPE (decl);
4329 if (TREE_CODE (type) == ARRAY_TYPE
4330 && TYPE_DOMAIN (type) == NULL_TREE
4331 && TREE_CODE (decl) != TYPE_DECL)
4333 /* do_default is really a C-ism to deal with tentative definitions.
4334 But let's leave it here to ease the eventual merge. */
4335 int do_default = !DECL_EXTERNAL (decl);
4336 tree initializer = init ? init : DECL_INITIAL (decl);
4339 /* Check that there are no designated initializers in INIT, as
4340 those are not supported in GNU C++, and as the middle-end
4341 will crash if presented with a non-numeric designated
4343 if (initializer && TREE_CODE (initializer) == CONSTRUCTOR)
4345 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initializer);
4346 constructor_elt *ce;
4349 VEC_iterate (constructor_elt, v, i, ce);
4351 if (!check_array_designated_initializer (ce))
4357 failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
4361 error ("initializer fails to determine size of %qD", decl);
4362 TREE_TYPE (decl) = error_mark_node;
4364 else if (failure == 2)
4368 error ("array size missing in %qD", decl);
4369 TREE_TYPE (decl) = error_mark_node;
4371 /* If a `static' var's size isn't known, make it extern as
4372 well as static, so it does not get allocated. If it's not
4373 `static', then don't mark it extern; finish_incomplete_decl
4374 will give it a default size and it will get allocated. */
4375 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4376 DECL_EXTERNAL (decl) = 1;
4378 else if (failure == 3)
4380 error ("zero-size array %qD", decl);
4381 TREE_TYPE (decl) = error_mark_node;
4385 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
4387 layout_decl (decl, 0);
4391 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
4392 any appropriate error messages regarding the layout. */
4395 layout_var_decl (tree decl)
4399 type = TREE_TYPE (decl);
4400 if (type == error_mark_node)
4403 /* If we haven't already layed out this declaration, do so now.
4404 Note that we must not call complete type for an external object
4405 because it's type might involve templates that we are not
4406 supposed to instantiate yet. (And it's perfectly valid to say
4407 `extern X x' for some incomplete type `X'.) */
4408 if (!DECL_EXTERNAL (decl))
4409 complete_type (type);
4410 if (!DECL_SIZE (decl)
4411 && TREE_TYPE (decl) != error_mark_node
4412 && (COMPLETE_TYPE_P (type)
4413 || (TREE_CODE (type) == ARRAY_TYPE
4414 && !TYPE_DOMAIN (type)
4415 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
4416 layout_decl (decl, 0);
4418 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
4420 /* An automatic variable with an incomplete type: that is an error.
4421 Don't talk about array types here, since we took care of that
4422 message in grokdeclarator. */
4423 error ("storage size of %qD isn't known", decl);
4424 TREE_TYPE (decl) = error_mark_node;
4427 /* Keep this code around in case we later want to control debug info
4428 based on whether a type is "used". (jason 1999-11-11) */
4430 else if (!DECL_EXTERNAL (decl) && IS_AGGR_TYPE (ttype))
4431 /* Let debugger know it should output info for this type. */
4432 note_debug_info_needed (ttype);
4434 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4435 note_debug_info_needed (DECL_CONTEXT (decl));
4438 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4439 && DECL_SIZE (decl) != NULL_TREE
4440 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4442 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4443 constant_expression_warning (DECL_SIZE (decl));
4445 error ("storage size of %qD isn't constant", decl);
4449 /* If a local static variable is declared in an inline function, or if
4450 we have a weak definition, we must endeavor to create only one
4451 instance of the variable at link-time. */
4454 maybe_commonize_var (tree decl)
4456 /* Static data in a function with comdat linkage also has comdat
4458 if (TREE_STATIC (decl)
4459 /* Don't mess with __FUNCTION__. */
4460 && ! DECL_ARTIFICIAL (decl)
4461 && DECL_FUNCTION_SCOPE_P (decl)
4462 /* Unfortunately, import_export_decl has not always been called
4463 before the function is processed, so we cannot simply check
4465 && (DECL_COMDAT (DECL_CONTEXT (decl))
4466 || ((DECL_DECLARED_INLINE_P (DECL_CONTEXT (decl))
4467 || DECL_TEMPLATE_INSTANTIATION (DECL_CONTEXT (decl)))
4468 && TREE_PUBLIC (DECL_CONTEXT (decl)))))
4472 /* With weak symbols, we simply make the variable COMDAT;
4473 that will cause copies in multiple translations units to
4475 comdat_linkage (decl);
4479 if (DECL_INITIAL (decl) == NULL_TREE
4480 || DECL_INITIAL (decl) == error_mark_node)
4482 /* Without weak symbols, we can use COMMON to merge
4483 uninitialized variables. */
4484 TREE_PUBLIC (decl) = 1;
4485 DECL_COMMON (decl) = 1;
4489 /* While for initialized variables, we must use internal
4490 linkage -- which means that multiple copies will not
4492 TREE_PUBLIC (decl) = 0;
4493 DECL_COMMON (decl) = 0;
4494 warning (0, "sorry: semantics of inline function static "
4495 "data %q+#D are wrong (you'll wind up "
4496 "with multiple copies)", decl);
4497 warning (0, "%J you can work around this by removing "
4503 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4504 /* Set it up again; we might have set DECL_INITIAL since the last
4506 comdat_linkage (decl);
4509 /* Issue an error message if DECL is an uninitialized const variable. */
4512 check_for_uninitialized_const_var (tree decl)
4514 tree type = TREE_TYPE (decl);
4516 /* ``Unless explicitly declared extern, a const object does not have
4517 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4519 if (TREE_CODE (decl) == VAR_DECL
4520 && TREE_CODE (type) != REFERENCE_TYPE
4521 && CP_TYPE_CONST_P (type)
4522 && !TYPE_NEEDS_CONSTRUCTING (type)
4523 && !DECL_INITIAL (decl))
4524 error ("uninitialized const %qD", decl);
4528 /* Structure holding the current initializer being processed by reshape_init.
4529 CUR is a pointer to the current element being processed, END is a pointer
4530 after the last element present in the initializer. */
4531 typedef struct reshape_iterator_t
4533 constructor_elt *cur;
4534 constructor_elt *end;
4537 static tree reshape_init_r (tree, reshape_iter *, bool);
4539 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4540 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4541 initialized. If there are no more such fields, the return value
4545 next_initializable_field (tree field)
4548 && (TREE_CODE (field) != FIELD_DECL
4549 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4550 || DECL_ARTIFICIAL (field)))
4551 field = TREE_CHAIN (field);
4556 /* Subroutine of reshape_init_array and reshape_init_vector, which does
4557 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
4558 INTEGER_CST representing the size of the array minus one (the maximum index),
4559 or NULL_TREE if the array was declared without specifying the size. D is
4560 the iterator within the constructor. */
4563 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d)
4566 bool sized_array_p = (max_index != NULL_TREE);
4567 unsigned HOST_WIDE_INT max_index_cst = 0;
4568 unsigned HOST_WIDE_INT index;
4570 /* The initializer for an array is always a CONSTRUCTOR. */
4571 new_init = build_constructor (NULL_TREE, NULL);
4575 /* Minus 1 is used for zero sized arrays. */
4576 if (integer_all_onesp (max_index))
4579 if (host_integerp (max_index, 1))
4580 max_index_cst = tree_low_cst (max_index, 1);
4581 /* sizetype is sign extended, not zero extended. */
4583 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
4587 /* Loop until there are no more initializers. */
4589 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
4594 check_array_designated_initializer (d->cur);
4595 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false);
4596 if (elt_init == error_mark_node)
4597 return error_mark_node;
4598 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), NULL_TREE, elt_init);
4604 /* Subroutine of reshape_init_r, processes the initializers for arrays.
4605 Parameters are the same of reshape_init_r. */
4608 reshape_init_array (tree type, reshape_iter *d)
4610 tree max_index = NULL_TREE;
4612 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
4614 if (TYPE_DOMAIN (type))
4615 max_index = array_type_nelts (type);
4617 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4620 /* Subroutine of reshape_init_r, processes the initializers for vectors.
4621 Parameters are the same of reshape_init_r. */
4624 reshape_init_vector (tree type, reshape_iter *d)
4626 tree max_index = NULL_TREE;
4629 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
4631 if (COMPOUND_LITERAL_P (d->cur->value))
4633 tree value = d->cur->value;
4634 if (!same_type_p (TREE_TYPE (value), type))
4636 error ("invalid type %qT as initializer for a vector of type %qT",
4637 TREE_TYPE (d->cur->value), type);
4638 value = error_mark_node;
4644 /* For a vector, the representation type is a struct
4645 containing a single member which is an array of the
4646 appropriate size. */
4647 rtype = TYPE_DEBUG_REPRESENTATION_TYPE (type);
4648 if (rtype && TYPE_DOMAIN (TREE_TYPE (TYPE_FIELDS (rtype))))
4649 max_index = array_type_nelts (TREE_TYPE (TYPE_FIELDS (rtype)));
4651 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4654 /* Subroutine of reshape_init_r, processes the initializers for classes
4655 or union. Parameters are the same of reshape_init_r. */
4658 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p)
4663 gcc_assert (CLASS_TYPE_P (type));
4665 /* The initializer for a class is always a CONSTRUCTOR. */
4666 new_init = build_constructor (NULL_TREE, NULL);
4667 field = next_initializable_field (TYPE_FIELDS (type));
4673 An initializer for an aggregate member that is an
4674 empty class shall have the form of an empty
4675 initializer-list {}. */
4676 if (!first_initializer_p)
4678 error ("initializer for %qT must be brace-enclosed", type);
4679 return error_mark_node;
4684 /* Loop through the initializable fields, gathering initializers. */
4685 while (d->cur != d->end)
4689 /* Handle designated initializers, as an extension. */
4692 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
4694 if (!field || TREE_CODE (field) != FIELD_DECL)
4696 error ("%qT has no non-static data member named %qD", type,
4698 return error_mark_node;
4702 /* If we processed all the member of the class, we are done. */
4706 field_init = reshape_init_r (TREE_TYPE (field), d,
4707 /*first_initializer_p=*/false);
4708 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
4712 When a union is initialized with a brace-enclosed
4713 initializer, the braces shall only contain an
4714 initializer for the first member of the union. */
4715 if (TREE_CODE (type) == UNION_TYPE)
4718 field = next_initializable_field (TREE_CHAIN (field));
4724 /* Subroutine of reshape_init, which processes a single initializer (part of
4725 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
4726 iterator within the CONSTRUCTOR which points to the initializer to process.
4727 FIRST_INITIALIZER_P is true if this is the first initializer of the
4728 CONSTRUCTOR node. */
4731 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p)
4733 tree init = d->cur->value;
4735 /* A non-aggregate type is always initialized with a single
4737 if (!CP_AGGREGATE_TYPE_P (type))
4739 /* It is invalid to initialize a non-aggregate type with a
4740 brace-enclosed initializer.
4741 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
4742 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
4743 a CONSTRUCTOR (with a record type). */
4744 if (TREE_CODE (init) == CONSTRUCTOR
4745 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
4747 error ("braces around scalar initializer for type %qT", type);
4748 init = error_mark_node;
4757 All implicit type conversions (clause _conv_) are considered when
4758 initializing the aggregate member with an initializer from an
4759 initializer-list. If the initializer can initialize a member,
4760 the member is initialized. Otherwise, if the member is itself a
4761 non-empty subaggregate, brace elision is assumed and the
4762 initializer is considered for the initialization of the first
4763 member of the subaggregate. */
4764 if (TREE_CODE (init) != CONSTRUCTOR
4765 && can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL))
4771 /* [dcl.init.string]
4773 A char array (whether plain char, signed char, or unsigned char)
4774 can be initialized by a string-literal (optionally enclosed in
4775 braces); a wchar_t array can be initialized by a wide
4776 string-literal (optionally enclosed in braces). */
4777 if (TREE_CODE (type) == ARRAY_TYPE
4778 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
4780 tree str_init = init;
4782 /* Strip one level of braces if and only if they enclose a single
4783 element (as allowed by [dcl.init.string]). */
4784 if (!first_initializer_p
4785 && TREE_CODE (str_init) == CONSTRUCTOR
4786 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (str_init)) == 1)
4788 str_init = VEC_index (constructor_elt,
4789 CONSTRUCTOR_ELTS (str_init), 0)->value;
4792 /* If it's a string literal, then it's the initializer for the array
4793 as a whole. Otherwise, continue with normal initialization for
4794 array types (one value per array element). */
4795 if (TREE_CODE (str_init) == STRING_CST)
4802 /* The following cases are about aggregates. If we are not within a full
4803 initializer already, and there is not a CONSTRUCTOR, it means that there
4804 is a missing set of braces (that is, we are processing the case for
4805 which reshape_init exists). */
4806 if (!first_initializer_p)
4808 if (TREE_CODE (init) == CONSTRUCTOR)
4810 if (TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init)))
4811 /* There is no need to reshape pointer-to-member function
4812 initializers, as they are always constructed correctly
4813 by the front end. */
4815 else if (COMPOUND_LITERAL_P (init))
4816 /* For a nested compound literal, there is no need to reshape since
4817 brace elision is not allowed. Even if we decided to allow it,
4818 we should add a call to reshape_init in finish_compound_literal,
4819 before calling digest_init, so changing this code would still
4820 not be necessary. */
4821 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
4825 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
4826 return reshape_init (type, init);
4830 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
4834 /* Dispatch to specialized routines. */
4835 if (CLASS_TYPE_P (type))
4836 return reshape_init_class (type, d, first_initializer_p);
4837 else if (TREE_CODE (type) == ARRAY_TYPE)
4838 return reshape_init_array (type, d);
4839 else if (TREE_CODE (type) == VECTOR_TYPE)
4840 return reshape_init_vector (type, d);
4845 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
4846 brace-enclosed aggregate initializer.
4848 INIT is the CONSTRUCTOR containing the list of initializers describing
4849 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
4850 It may not presently match the shape of the TYPE; for example:
4852 struct S { int a; int b; };
4853 struct S a[] = { 1, 2, 3, 4 };
4855 Here INIT will hold a VEC of four elements, rather than a
4856 VEC of two elements, each itself a VEC of two elements. This
4857 routine transforms INIT from the former form into the latter. The
4858 revised CONSTRUCTOR node is returned. */
4861 reshape_init (tree type, tree init)
4863 VEC(constructor_elt, gc) *v;
4867 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
4869 v = CONSTRUCTOR_ELTS (init);
4871 /* An empty constructor does not need reshaping, and it is always a valid
4873 if (VEC_empty (constructor_elt, v))
4876 /* Recurse on this CONSTRUCTOR. */
4877 d.cur = VEC_index (constructor_elt, v, 0);
4878 d.end = d.cur + VEC_length (constructor_elt, v);
4880 new_init = reshape_init_r (type, &d, true);
4881 if (new_init == error_mark_node)
4882 return error_mark_node;
4884 /* Make sure all the element of the constructor were used. Otherwise,
4885 issue an error about exceeding initializers. */
4887 error ("too many initializers for %qT", type);
4892 /* Verify INIT (the initializer for DECL), and record the
4893 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
4894 grok_reference_init.
4896 If the return value is non-NULL, it is an expression that must be
4897 evaluated dynamically to initialize DECL. */
4900 check_initializer (tree decl, tree init, int flags, tree *cleanup)
4902 tree type = TREE_TYPE (decl);
4903 tree init_code = NULL;
4905 /* Things that are going to be initialized need to have complete
4907 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
4909 if (type == error_mark_node)
4910 /* We will have already complained. */
4913 if (TREE_CODE (type) == ARRAY_TYPE)
4915 tree element_type = TREE_TYPE (type);
4917 /* The array type itself need not be complete, because the
4918 initializer may tell us how many elements are in the array.
4919 But, the elements of the array must be complete. */
4920 if (!COMPLETE_TYPE_P (complete_type (element_type)))
4922 error ("elements of array %q#D have incomplete type", decl);
4925 /* It is not valid to initialize a VLA. */
4927 && ((COMPLETE_TYPE_P (type) && !TREE_CONSTANT (TYPE_SIZE (type)))
4928 || !TREE_CONSTANT (TYPE_SIZE (element_type))))
4930 error ("variable-sized object %qD may not be initialized", decl);
4934 else if (!COMPLETE_TYPE_P (type))
4936 error ("%qD has incomplete type", decl);
4937 TREE_TYPE (decl) = error_mark_node;
4941 /* There is no way to make a variable-sized class type in GNU C++. */
4942 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
4944 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
4946 int init_len = VEC_length (constructor_elt, CONSTRUCTOR_ELTS (init));
4947 if (SCALAR_TYPE_P (type))
4951 error ("scalar object %qD requires one element in initializer",
4953 TREE_TYPE (decl) = error_mark_node;
4957 else if ((cxx_dialect == cxx98) && !CP_AGGREGATE_TYPE_P (type))
4959 /* A non-aggregate that is not a scalar cannot be initialized
4960 via an initializer-list in C++98. */
4961 error ("braces around initializer for non-aggregate type %qT",
4963 TREE_TYPE (decl) = error_mark_node;
4968 if (TREE_CODE (decl) == CONST_DECL)
4970 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
4972 DECL_INITIAL (decl) = init;
4974 gcc_assert (init != NULL_TREE);
4977 else if (!DECL_EXTERNAL (decl) && TREE_CODE (type) == REFERENCE_TYPE)
4978 init = grok_reference_init (decl, type, init, cleanup);
4981 /* Do not reshape constructors of vectors (they don't need to be
4983 if (TREE_CODE (init) == CONSTRUCTOR
4984 && !COMPOUND_LITERAL_P (init)
4985 && !TREE_TYPE (init)) /* ptrmemfunc */
4987 init = reshape_init (type, init);
4989 if ((*targetm.vector_opaque_p) (type))
4991 error ("opaque vector types cannot be initialized");
4992 init = error_mark_node;
4996 /* If DECL has an array type without a specific bound, deduce the
4997 array size from the initializer. */
4998 maybe_deduce_size_from_array_init (decl, init);
4999 type = TREE_TYPE (decl);
5000 if (type == error_mark_node)
5003 if (TREE_CODE (type) == ARRAY_TYPE && TYPE_NEEDS_CONSTRUCTING (type))
5004 goto initialize_aggr;
5005 else if (CLASS_TYPE_P (type))
5007 if (TREE_CODE (init) == CONSTRUCTOR)
5009 if (TYPE_NON_AGGREGATE_CLASS (type))
5011 error ("%qD must be initialized by constructor, "
5014 init = error_mark_node;
5017 goto dont_use_constructor;
5021 int saved_stmts_are_full_exprs_p;
5024 saved_stmts_are_full_exprs_p = 0;
5025 if (building_stmt_tree ())
5027 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5028 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5030 init = build_aggr_init (decl, init, flags);
5031 if (building_stmt_tree ())
5032 current_stmt_tree ()->stmts_are_full_exprs_p =
5033 saved_stmts_are_full_exprs_p;
5039 dont_use_constructor:
5040 if (TREE_CODE (init) != TREE_VEC)
5042 init_code = store_init_value (decl, init);
5043 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
5044 && DECL_INITIAL (decl)
5045 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
5046 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
5047 warning (0, "array %qD initialized by parenthesized string literal %qE",
5048 decl, DECL_INITIAL (decl));
5053 else if (DECL_EXTERNAL (decl))
5055 else if (TYPE_P (type) && TYPE_NEEDS_CONSTRUCTING (type))
5056 goto initialize_aggr;
5057 else if (IS_AGGR_TYPE (type))
5059 tree core_type = strip_array_types (type);
5061 if (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type))
5062 error ("structure %qD with uninitialized const members", decl);
5063 if (CLASSTYPE_REF_FIELDS_NEED_INIT (core_type))
5064 error ("structure %qD with uninitialized reference members", decl);
5066 check_for_uninitialized_const_var (decl);
5069 check_for_uninitialized_const_var (decl);
5071 if (init && init != error_mark_node)
5072 init_code = build2 (INIT_EXPR, type, decl, init);
5077 /* If DECL is not a local variable, give it RTL. */
5080 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
5082 int toplev = toplevel_bindings_p ();
5084 const char *filename;
5086 /* Set the DECL_ASSEMBLER_NAME for the object. */
5089 /* The `register' keyword, when used together with an
5090 asm-specification, indicates that the variable should be
5091 placed in a particular register. */
5092 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
5094 set_user_assembler_name (decl, asmspec);
5095 DECL_HARD_REGISTER (decl) = 1;
5099 if (TREE_CODE (decl) == FUNCTION_DECL
5100 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
5101 set_builtin_user_assembler_name (decl, asmspec);
5102 set_user_assembler_name (decl, asmspec);
5106 /* Handle non-variables up front. */
5107 if (TREE_CODE (decl) != VAR_DECL)
5109 rest_of_decl_compilation (decl, toplev, at_eof);
5113 /* If we see a class member here, it should be a static data
5115 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
5117 gcc_assert (TREE_STATIC (decl));
5118 /* An in-class declaration of a static data member should be
5119 external; it is only a declaration, and not a definition. */
5120 if (init == NULL_TREE)
5121 gcc_assert (DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl));
5124 /* We don't create any RTL for local variables. */
5125 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5128 /* We defer emission of local statics until the corresponding
5129 DECL_EXPR is expanded. */
5130 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
5132 /* We try to defer namespace-scope static constants so that they are
5133 not emitted into the object file unnecessarily. */
5134 filename = input_filename;
5135 if (!DECL_VIRTUAL_P (decl)
5136 && TREE_READONLY (decl)
5137 && DECL_INITIAL (decl) != NULL_TREE
5138 && DECL_INITIAL (decl) != error_mark_node
5140 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
5142 && !TREE_PUBLIC (decl))
5144 /* Fool with the linkage of static consts according to #pragma
5146 struct c_fileinfo *finfo = get_fileinfo (filename);
5147 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
5149 TREE_PUBLIC (decl) = 1;
5150 DECL_EXTERNAL (decl) = finfo->interface_only;
5155 /* Likewise for template instantiations. */
5156 else if (DECL_LANG_SPECIFIC (decl)
5157 && DECL_IMPLICIT_INSTANTIATION (decl))
5160 /* If we're not deferring, go ahead and assemble the variable. */
5162 rest_of_decl_compilation (decl, toplev, at_eof);
5165 /* walk_tree helper for wrap_temporary_cleanups, below. */
5168 wrap_cleanups_r (tree *stmt_p, int *walk_subtrees, void *data)
5170 if (TYPE_P (*stmt_p))
5176 if (TREE_CODE (*stmt_p) == TARGET_EXPR)
5178 tree guard = (tree)data;
5179 tree tcleanup = TARGET_EXPR_CLEANUP (*stmt_p);
5181 tcleanup = build2 (TRY_CATCH_EXPR, void_type_node, tcleanup, guard);
5182 /* Tell honor_protect_cleanup_actions to handle this as a separate
5184 TRY_CATCH_IS_CLEANUP (tcleanup) = 1;
5186 TARGET_EXPR_CLEANUP (*stmt_p) = tcleanup;
5192 /* We're initializing a local variable which has a cleanup GUARD. If there
5193 are any temporaries used in the initializer INIT of this variable, we
5194 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
5195 variable will be cleaned up properly if one of them throws.
5197 Unfortunately, there's no way to express this properly in terms of
5198 nesting, as the regions for the temporaries overlap the region for the
5199 variable itself; if there are two temporaries, the variable needs to be
5200 the first thing destroyed if either of them throws. However, we only
5201 want to run the variable's cleanup if it actually got constructed. So
5202 we need to guard the temporary cleanups with the variable's cleanup if
5203 they are run on the normal path, but not if they are run on the
5204 exceptional path. We implement this by telling
5205 honor_protect_cleanup_actions to strip the variable cleanup from the
5206 exceptional path. */
5209 wrap_temporary_cleanups (tree init, tree guard)
5211 cp_walk_tree_without_duplicates (&init, wrap_cleanups_r, (void *)guard);
5214 /* Generate code to initialize DECL (a local variable). */
5217 initialize_local_var (tree decl, tree init)
5219 tree type = TREE_TYPE (decl);
5223 gcc_assert (TREE_CODE (decl) == VAR_DECL
5224 || TREE_CODE (decl) == RESULT_DECL);
5225 gcc_assert (!TREE_STATIC (decl));
5227 if (DECL_SIZE (decl) == NULL_TREE)
5229 /* If we used it already as memory, it must stay in memory. */
5230 DECL_INITIAL (decl) = NULL_TREE;
5231 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
5235 if (type == error_mark_node)
5238 /* Compute and store the initial value. */
5239 already_used = TREE_USED (decl) || TREE_USED (type);
5241 /* Generate a cleanup, if necessary. */
5242 cleanup = cxx_maybe_build_cleanup (decl);
5244 /* Perform the initialization. */
5247 int saved_stmts_are_full_exprs_p;
5249 /* If we're only initializing a single object, guard the destructors
5250 of any temporaries used in its initializer with its destructor.
5251 This isn't right for arrays because each element initialization is
5252 a full-expression. */
5253 if (cleanup && TREE_CODE (type) != ARRAY_TYPE)
5254 wrap_temporary_cleanups (init, cleanup);
5256 gcc_assert (building_stmt_tree ());
5257 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5258 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5259 finish_expr_stmt (init);
5260 current_stmt_tree ()->stmts_are_full_exprs_p =
5261 saved_stmts_are_full_exprs_p;
5264 /* Set this to 0 so we can tell whether an aggregate which was
5265 initialized was ever used. Don't do this if it has a
5266 destructor, so we don't complain about the 'resource
5267 allocation is initialization' idiom. Now set
5268 attribute((unused)) on types so decls of that type will be
5269 marked used. (see TREE_USED, above.) */
5270 if (TYPE_NEEDS_CONSTRUCTING (type)
5272 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
5273 && DECL_NAME (decl))
5274 TREE_USED (decl) = 0;
5275 else if (already_used)
5276 TREE_USED (decl) = 1;
5279 finish_decl_cleanup (decl, cleanup);
5282 /* DECL is a VAR_DECL for a compiler-generated variable with static
5283 storage duration (like a virtual table) whose initializer is a
5284 compile-time constant. INIT must be either a TREE_LIST of values,
5285 or a CONSTRUCTOR. Initialize the variable and provide it to the
5289 initialize_artificial_var (tree decl, tree init)
5291 gcc_assert (DECL_ARTIFICIAL (decl));
5292 if (TREE_CODE (init) == TREE_LIST)
5293 init = build_constructor_from_list (NULL_TREE, init);
5294 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
5295 DECL_INITIAL (decl) = init;
5296 DECL_INITIALIZED_P (decl) = 1;
5297 determine_visibility (decl);
5298 layout_var_decl (decl);
5299 maybe_commonize_var (decl);
5300 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
5303 /* INIT is the initializer for a variable, as represented by the
5304 parser. Returns true iff INIT is value-dependent. */
5307 value_dependent_init_p (tree init)
5309 if (TREE_CODE (init) == TREE_LIST)
5310 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5311 return any_value_dependent_elements_p (init);
5312 else if (TREE_CODE (init) == CONSTRUCTOR)
5313 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5315 VEC(constructor_elt, gc) *elts;
5319 elts = CONSTRUCTOR_ELTS (init);
5320 nelts = VEC_length (constructor_elt, elts);
5321 for (i = 0; i < nelts; ++i)
5322 if (value_dependent_init_p (VEC_index (constructor_elt,
5327 /* It must be a simple expression, e.g., int i = 3; */
5328 return value_dependent_expression_p (init);
5333 /* Finish processing of a declaration;
5334 install its line number and initial value.
5335 If the length of an array type is not known before,
5336 it must be determined now, from the initial value, or it is an error.
5338 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
5339 true, then INIT is an integral constant expression.
5341 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
5342 if the (init) syntax was used. */
5345 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
5346 tree asmspec_tree, int flags)
5350 const char *asmspec = NULL;
5351 int was_readonly = 0;
5352 bool var_definition_p = false;
5353 int saved_processing_template_decl;
5355 if (decl == error_mark_node)
5360 error ("assignment (not initialization) in declaration");
5364 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
5365 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
5366 gcc_assert (TREE_CODE (decl) != PARM_DECL);
5368 type = TREE_TYPE (decl);
5369 if (type == error_mark_node)
5372 /* Assume no cleanup is required. */
5373 cleanup = NULL_TREE;
5374 saved_processing_template_decl = processing_template_decl;
5376 /* If a name was specified, get the string. */
5377 if (global_scope_p (current_binding_level))
5378 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
5379 if (asmspec_tree && asmspec_tree != error_mark_node)
5380 asmspec = TREE_STRING_POINTER (asmspec_tree);
5382 if (current_class_type
5383 && CP_DECL_CONTEXT (decl) == current_class_type
5384 && TYPE_BEING_DEFINED (current_class_type)
5385 && (DECL_INITIAL (decl) || init))
5386 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
5388 if (processing_template_decl)
5390 bool type_dependent_p;
5392 /* Add this declaration to the statement-tree. */
5393 if (at_function_scope_p ())
5394 add_decl_expr (decl);
5396 type_dependent_p = dependent_type_p (type);
5398 if (check_for_bare_parameter_packs (init))
5401 DECL_INITIAL (decl) = NULL_TREE;
5404 if (init && init_const_expr_p)
5406 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5407 if (DECL_INTEGRAL_CONSTANT_VAR_P (decl))
5408 TREE_CONSTANT (decl) = 1;
5411 /* Generally, initializers in templates are expanded when the
5412 template is instantiated. But, if DECL is an integral
5413 constant static data member, then it can be used in future
5414 integral constant expressions, and its value must be
5417 && DECL_CLASS_SCOPE_P (decl)
5418 && DECL_INTEGRAL_CONSTANT_VAR_P (decl)
5419 && !type_dependent_p
5420 && !value_dependent_init_p (init)))
5423 DECL_INITIAL (decl) = init;
5424 if (TREE_CODE (decl) == VAR_DECL
5425 && !DECL_PRETTY_FUNCTION_P (decl)
5426 && !type_dependent_p)
5427 maybe_deduce_size_from_array_init (decl, init);
5431 if (TREE_CODE (init) == TREE_LIST)
5433 /* If the parenthesized-initializer form was used (e.g.,
5434 "int A<N>::i(X)"), then INIT will be a TREE_LIST of initializer
5435 arguments. (There is generally only one.) We convert them
5438 for (; list; list = TREE_CHAIN (list))
5440 tree elt = TREE_VALUE (list);
5441 TREE_VALUE (list) = fold_non_dependent_expr (elt);
5445 init = fold_non_dependent_expr (init);
5446 processing_template_decl = 0;
5449 /* Take care of TYPE_DECLs up front. */
5450 if (TREE_CODE (decl) == TYPE_DECL)
5452 if (type != error_mark_node
5453 && IS_AGGR_TYPE (type) && DECL_NAME (decl))
5455 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
5456 warning (0, "shadowing previous type declaration of %q#D", decl);
5457 set_identifier_type_value (DECL_NAME (decl), decl);
5460 /* If we have installed this as the canonical typedef for this
5461 type, and that type has not been defined yet, delay emitting
5462 the debug information for it, as we will emit it later. */
5463 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
5464 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
5465 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
5467 rest_of_decl_compilation (decl, DECL_CONTEXT (decl) == NULL_TREE,
5472 /* A reference will be modified here, as it is initialized. */
5473 if (! DECL_EXTERNAL (decl)
5474 && TREE_READONLY (decl)
5475 && TREE_CODE (type) == REFERENCE_TYPE)
5478 TREE_READONLY (decl) = 0;
5481 if (TREE_CODE (decl) == VAR_DECL)
5483 /* Only PODs can have thread-local storage. Other types may require
5484 various kinds of non-trivial initialization. */
5485 if (DECL_THREAD_LOCAL_P (decl) && !pod_type_p (TREE_TYPE (decl)))
5486 error ("%qD cannot be thread-local because it has non-POD type %qT",
5487 decl, TREE_TYPE (decl));
5488 /* If this is a local variable that will need a mangled name,
5489 register it now. We must do this before processing the
5490 initializer for the variable, since the initialization might
5491 require a guard variable, and since the mangled name of the
5492 guard variable will depend on the mangled name of this
5494 if (DECL_FUNCTION_SCOPE_P (decl)
5495 && TREE_STATIC (decl)
5496 && !DECL_ARTIFICIAL (decl))
5497 push_local_name (decl);
5498 /* Convert the initializer to the type of DECL, if we have not
5499 already initialized DECL. */
5500 if (!DECL_INITIALIZED_P (decl)
5501 /* If !DECL_EXTERNAL then DECL is being defined. In the
5502 case of a static data member initialized inside the
5503 class-specifier, there can be an initializer even if DECL
5504 is *not* defined. */
5505 && (!DECL_EXTERNAL (decl) || init))
5507 if (TYPE_FOR_JAVA (type) && IS_AGGR_TYPE (type))
5510 = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
5511 /* Allow libjava/prims.cc define primitive classes. */
5512 if (init != NULL_TREE
5513 || jclass == NULL_TREE
5514 || TREE_CODE (jclass) != TYPE_DECL
5515 || !POINTER_TYPE_P (TREE_TYPE (jclass))
5516 || !same_type_ignoring_top_level_qualifiers_p
5517 (type, TREE_TYPE (TREE_TYPE (jclass))))
5518 error ("Java object %qD not allocated with %<new%>", decl);
5523 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
5524 if (init_const_expr_p)
5526 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5527 if (DECL_INTEGRAL_CONSTANT_VAR_P (decl))
5528 TREE_CONSTANT (decl) = 1;
5531 init = check_initializer (decl, init, flags, &cleanup);
5532 /* Thread-local storage cannot be dynamically initialized. */
5533 if (DECL_THREAD_LOCAL_P (decl) && init)
5535 error ("%qD is thread-local and so cannot be dynamically "
5536 "initialized", decl);
5540 /* Check that the initializer for a static data member was a
5541 constant. Although we check in the parser that the
5542 initializer is an integral constant expression, we do not
5543 simplify division-by-zero at the point at which it
5544 occurs. Therefore, in:
5546 struct S { static const int i = 7 / 0; };
5548 we issue an error at this point. It would
5549 probably be better to forbid division by zero in
5550 integral constant expressions. */
5551 if (DECL_EXTERNAL (decl) && init)
5553 error ("%qD cannot be initialized by a non-constant expression"
5554 " when being declared", decl);
5555 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
5563 The memory occupied by any object of static storage
5564 duration is zero-initialized at program startup before
5565 any other initialization takes place.
5567 We cannot create an appropriate initializer until after
5568 the type of DECL is finalized. If DECL_INITIAL is set,
5569 then the DECL is statically initialized, and any
5570 necessary zero-initialization has already been performed. */
5571 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
5572 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
5573 /*nelts=*/NULL_TREE,
5574 /*static_storage_p=*/true);
5575 /* Remember that the initialization for this variable has
5577 DECL_INITIALIZED_P (decl) = 1;
5578 /* This declaration is the definition of this variable,
5579 unless we are initializing a static data member within
5580 the class specifier. */
5581 if (!DECL_EXTERNAL (decl))
5582 var_definition_p = true;
5584 /* If the variable has an array type, lay out the type, even if
5585 there is no initializer. It is valid to index through the
5586 array, and we must get TYPE_ALIGN set correctly on the array
5588 else if (TREE_CODE (type) == ARRAY_TYPE)
5591 else if (TREE_CODE (decl) == FIELD_DECL
5592 && TYPE_FOR_JAVA (type) && IS_AGGR_TYPE (type))
5593 error ("non-static data member %qD has Java class type", decl);
5595 /* Add this declaration to the statement-tree. This needs to happen
5596 after the call to check_initializer so that the DECL_EXPR for a
5597 reference temp is added before the DECL_EXPR for the reference itself. */
5598 if (at_function_scope_p ())
5599 add_decl_expr (decl);
5601 /* Let the middle end know about variables and functions -- but not
5602 static data members in uninstantiated class templates. */
5603 if (!saved_processing_template_decl
5604 && (TREE_CODE (decl) == VAR_DECL
5605 || TREE_CODE (decl) == FUNCTION_DECL))
5607 if (TREE_CODE (decl) == VAR_DECL)
5609 layout_var_decl (decl);
5610 maybe_commonize_var (decl);
5613 /* This needs to happen after the linkage is set. */
5614 determine_visibility (decl);
5616 if (var_definition_p && TREE_STATIC (decl))
5618 /* If a TREE_READONLY variable needs initialization
5619 at runtime, it is no longer readonly and we need to
5620 avoid MEM_READONLY_P being set on RTL created for it. */
5623 if (TREE_READONLY (decl))
5624 TREE_READONLY (decl) = 0;
5627 else if (was_readonly)
5628 TREE_READONLY (decl) = 1;
5631 make_rtl_for_nonlocal_decl (decl, init, asmspec);
5633 /* Check for abstractness of the type. Notice that there is no
5634 need to strip array types here since the check for those types
5635 is already done within create_array_type_for_decl. */
5636 if (TREE_CODE (type) == FUNCTION_TYPE
5637 || TREE_CODE (type) == METHOD_TYPE)
5638 abstract_virtuals_error (decl, TREE_TYPE (type));
5640 abstract_virtuals_error (decl, type);
5642 if (TREE_CODE (decl) == FUNCTION_DECL
5643 || TREE_TYPE (decl) == error_mark_node)
5644 /* No initialization required. */
5646 else if (DECL_EXTERNAL (decl)
5647 && ! (DECL_LANG_SPECIFIC (decl)
5648 && DECL_NOT_REALLY_EXTERN (decl)))
5651 DECL_INITIAL (decl) = init;
5653 /* A variable definition. */
5654 else if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5655 /* Initialize the local variable. */
5656 initialize_local_var (decl, init);
5658 /* If a variable is defined, and then a subsequent
5659 definition with external linkage is encountered, we will
5660 get here twice for the same variable. We want to avoid
5661 calling expand_static_init more than once. For variables
5662 that are not static data members, we can call
5663 expand_static_init only when we actually process the
5664 initializer. It is not legal to redeclare a static data
5665 member, so this issue does not arise in that case. */
5666 else if (var_definition_p && TREE_STATIC (decl))
5667 expand_static_init (decl, init);
5670 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
5671 reference, insert it in the statement-tree now. */
5673 push_cleanup (decl, cleanup, false);
5676 processing_template_decl = saved_processing_template_decl;
5679 TREE_READONLY (decl) = 1;
5681 /* If this was marked 'used', be sure it will be output. */
5682 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
5683 mark_decl_referenced (decl);
5686 /* This is here for a midend callback from c-common.c. */
5689 finish_decl (tree decl, tree init, tree asmspec_tree)
5691 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, asmspec_tree, 0);
5694 /* Returns a declaration for a VAR_DECL as if:
5696 extern "C" TYPE NAME;
5698 had been seen. Used to create compiler-generated global
5702 declare_global_var (tree name, tree type)
5706 push_to_top_level ();
5707 decl = build_decl (VAR_DECL, name, type);
5708 TREE_PUBLIC (decl) = 1;
5709 DECL_EXTERNAL (decl) = 1;
5710 DECL_ARTIFICIAL (decl) = 1;
5711 /* If the user has explicitly declared this variable (perhaps
5712 because the code we are compiling is part of a low-level runtime
5713 library), then it is possible that our declaration will be merged
5714 with theirs by pushdecl. */
5715 decl = pushdecl (decl);
5716 finish_decl (decl, NULL_TREE, NULL_TREE);
5717 pop_from_top_level ();
5722 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
5723 if "__cxa_atexit" is not being used) corresponding to the function
5724 to be called when the program exits. */
5727 get_atexit_fn_ptr_type (void)
5732 if (!atexit_fn_ptr_type_node)
5734 if (flag_use_cxa_atexit
5735 && !targetm.cxx.use_atexit_for_cxa_atexit ())
5736 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
5737 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
5739 /* The parameter to "atexit" is "void (*)(void)". */
5740 arg_types = void_list_node;
5742 fn_type = build_function_type (void_type_node, arg_types);
5743 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
5746 return atexit_fn_ptr_type_node;
5749 /* Returns a pointer to the `atexit' function. Note that if
5750 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
5751 `__cxa_atexit' function specified in the IA64 C++ ABI. */
5754 get_atexit_node (void)
5761 bool use_aeabi_atexit;
5766 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
5768 /* The declaration for `__cxa_atexit' is:
5770 int __cxa_atexit (void (*)(void *), void *, void *)
5772 We build up the argument types and then then function type
5775 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
5776 /* First, build the pointer-to-function type for the first
5778 fn_ptr_type = get_atexit_fn_ptr_type ();
5779 /* Then, build the rest of the argument types. */
5780 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
5781 if (use_aeabi_atexit)
5783 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
5784 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
5788 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
5789 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
5791 /* And the final __cxa_atexit type. */
5792 fn_type = build_function_type (integer_type_node, arg_types);
5793 fn_ptr_type = build_pointer_type (fn_type);
5794 if (use_aeabi_atexit)
5795 name = "__aeabi_atexit";
5797 name = "__cxa_atexit";
5801 /* The declaration for `atexit' is:
5803 int atexit (void (*)());
5805 We build up the argument types and then then function type
5807 fn_ptr_type = get_atexit_fn_ptr_type ();
5808 arg_types = tree_cons (NULL_TREE, fn_ptr_type, void_list_node);
5809 /* Build the final atexit type. */
5810 fn_type = build_function_type (integer_type_node, arg_types);
5814 /* Now, build the function declaration. */
5815 push_lang_context (lang_name_c);
5816 atexit_fndecl = build_library_fn_ptr (name, fn_type);
5817 mark_used (atexit_fndecl);
5818 pop_lang_context ();
5819 atexit_node = decay_conversion (atexit_fndecl);
5824 /* Returns the __dso_handle VAR_DECL. */
5827 get_dso_handle_node (void)
5829 if (dso_handle_node)
5830 return dso_handle_node;
5832 /* Declare the variable. */
5833 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
5836 return dso_handle_node;
5839 /* Begin a new function with internal linkage whose job will be simply
5840 to destroy some particular variable. */
5842 static GTY(()) int start_cleanup_cnt;
5845 start_cleanup_fn (void)
5850 bool use_cxa_atexit = flag_use_cxa_atexit
5851 && !targetm.cxx.use_atexit_for_cxa_atexit ();
5853 push_to_top_level ();
5855 /* No need to mangle this. */
5856 push_lang_context (lang_name_c);
5858 /* Build the name of the function. */
5859 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
5860 /* Build the function declaration. */
5861 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
5862 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
5863 /* It's a function with internal linkage, generated by the
5865 TREE_PUBLIC (fndecl) = 0;
5866 DECL_ARTIFICIAL (fndecl) = 1;
5867 /* Make the function `inline' so that it is only emitted if it is
5868 actually needed. It is unlikely that it will be inlined, since
5869 it is only called via a function pointer, but we avoid unnecessary
5870 emissions this way. */
5871 DECL_INLINE (fndecl) = 1;
5872 DECL_DECLARED_INLINE_P (fndecl) = 1;
5873 DECL_INTERFACE_KNOWN (fndecl) = 1;
5874 /* Build the parameter. */
5879 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
5880 DECL_CONTEXT (parmdecl) = fndecl;
5881 TREE_USED (parmdecl) = 1;
5882 DECL_ARGUMENTS (fndecl) = parmdecl;
5886 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
5888 pop_lang_context ();
5890 return current_function_decl;
5893 /* Finish the cleanup function begun by start_cleanup_fn. */
5896 end_cleanup_fn (void)
5898 expand_or_defer_fn (finish_function (0));
5900 pop_from_top_level ();
5903 /* Generate code to handle the destruction of DECL, an object with
5904 static storage duration. */
5907 register_dtor_fn (tree decl)
5916 type = TREE_TYPE (decl);
5917 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
5918 return void_zero_node;
5920 /* If we're using "__cxa_atexit" (or "__aeabi_atexit"), and DECL is
5921 a class object, we can just pass the destructor to
5922 "__cxa_atexit"; we don't have to build a temporary function to do
5924 use_dtor = (flag_use_cxa_atexit
5925 && !targetm.cxx.use_atexit_for_cxa_atexit ()
5926 && CLASS_TYPE_P (type));
5931 /* Find the destructor. */
5932 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
5933 gcc_assert (idx >= 0);
5934 cleanup = VEC_index (tree, CLASSTYPE_METHOD_VEC (type), idx);
5935 /* Make sure it is accessible. */
5936 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup);
5940 /* Call build_cleanup before we enter the anonymous function so
5941 that any access checks will be done relative to the current
5942 scope, rather than the scope of the anonymous function. */
5943 build_cleanup (decl);
5945 /* Now start the function. */
5946 cleanup = start_cleanup_fn ();
5948 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
5949 to the original function, rather than the anonymous one. That
5950 will make the back end think that nested functions are in use,
5951 which causes confusion. */
5952 push_deferring_access_checks (dk_no_check);
5953 fcall = build_cleanup (decl);
5954 pop_deferring_access_checks ();
5956 /* Create the body of the anonymous function. */
5957 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
5958 finish_expr_stmt (fcall);
5959 finish_compound_stmt (compound_stmt);
5963 /* Call atexit with the cleanup function. */
5964 mark_used (cleanup);
5965 cleanup = build_address (cleanup);
5966 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
5972 /* We must convert CLEANUP to the type that "__cxa_atexit"
5974 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
5975 /* "__cxa_atexit" will pass the address of DECL to the
5976 cleanup function. */
5978 addr = build_address (decl);
5979 /* The declared type of the parameter to "__cxa_atexit" is
5980 "void *". For plain "T*", we could just let the
5981 machinery in build_function_call convert it -- but if the
5982 type is "cv-qualified T *", then we need to convert it
5983 before passing it in, to avoid spurious errors. */
5984 addr = build_nop (ptr_type_node, addr);
5987 /* Since the cleanup functions we build ignore the address
5988 they're given, there's no reason to pass the actual address
5989 in, and, in general, it's cheaper to pass NULL than any
5991 addr = null_pointer_node;
5992 args = tree_cons (NULL_TREE,
5993 build_unary_op (ADDR_EXPR, get_dso_handle_node (), 0),
5995 if (targetm.cxx.use_aeabi_atexit ())
5997 args = tree_cons (NULL_TREE, cleanup, args);
5998 args = tree_cons (NULL_TREE, addr, args);
6002 args = tree_cons (NULL_TREE, addr, args);
6003 args = tree_cons (NULL_TREE, cleanup, args);
6007 args = tree_cons (NULL_TREE, cleanup, NULL_TREE);
6008 return build_function_call (get_atexit_node (), args);
6011 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
6012 is its initializer. Generate code to handle the construction
6013 and destruction of DECL. */
6016 expand_static_init (tree decl, tree init)
6018 gcc_assert (TREE_CODE (decl) == VAR_DECL);
6019 gcc_assert (TREE_STATIC (decl));
6021 /* Some variables require no initialization. */
6023 && !TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))
6024 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
6027 if (DECL_FUNCTION_SCOPE_P (decl))
6029 /* Emit code to perform this initialization but once. */
6030 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
6031 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
6032 tree guard, guard_addr;
6033 tree acquire_fn, release_fn, abort_fn;
6036 /* Emit code to perform this initialization but once. This code
6039 static <type> guard;
6040 if (!guard.first_byte) {
6041 if (__cxa_guard_acquire (&guard)) {
6044 // Do initialization.
6045 flag = true; __cxa_guard_release (&guard);
6046 // Register variable for destruction at end of program.
6048 if (!flag) __cxa_guard_abort (&guard);
6052 Note that the `flag' variable is only set to 1 *after* the
6053 initialization is complete. This ensures that an exception,
6054 thrown during the construction, will cause the variable to
6055 reinitialized when we pass through this code again, as per:
6059 If the initialization exits by throwing an exception, the
6060 initialization is not complete, so it will be tried again
6061 the next time control enters the declaration.
6063 This process should be thread-safe, too; multiple threads
6064 should not be able to initialize the variable more than
6067 /* Create the guard variable. */
6068 guard = get_guard (decl);
6070 /* This optimization isn't safe on targets with relaxed memory
6071 consistency. On such targets we force synchronization in
6072 __cxa_guard_acquire. */
6073 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6075 /* Begin the conditional initialization. */
6076 if_stmt = begin_if_stmt ();
6077 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
6078 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6081 if (flag_threadsafe_statics)
6083 guard_addr = build_address (guard);
6085 acquire_fn = get_identifier ("__cxa_guard_acquire");
6086 release_fn = get_identifier ("__cxa_guard_release");
6087 abort_fn = get_identifier ("__cxa_guard_abort");
6088 if (!get_global_value_if_present (acquire_fn, &acquire_fn))
6090 tree argtypes = tree_cons (NULL_TREE, TREE_TYPE (guard_addr),
6092 tree vfntype = build_function_type (void_type_node, argtypes);
6093 acquire_fn = push_library_fn
6094 (acquire_fn, build_function_type (integer_type_node, argtypes));
6095 release_fn = push_library_fn (release_fn, vfntype);
6096 abort_fn = push_library_fn (abort_fn, vfntype);
6100 release_fn = identifier_global_value (release_fn);
6101 abort_fn = identifier_global_value (abort_fn);
6104 inner_if_stmt = begin_if_stmt ();
6105 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
6108 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6109 begin = get_target_expr (boolean_false_node);
6110 flag = TARGET_EXPR_SLOT (begin);
6112 TARGET_EXPR_CLEANUP (begin)
6113 = build3 (COND_EXPR, void_type_node, flag,
6115 build_call_n (abort_fn, 1, guard_addr));
6116 CLEANUP_EH_ONLY (begin) = 1;
6118 /* Do the initialization itself. */
6119 init = add_stmt_to_compound (begin, init);
6120 init = add_stmt_to_compound
6121 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
6122 init = add_stmt_to_compound
6123 (init, build_call_n (release_fn, 1, guard_addr));
6126 init = add_stmt_to_compound (init, set_guard (guard));
6128 /* Use atexit to register a function for destroying this static
6130 init = add_stmt_to_compound (init, register_dtor_fn (decl));
6132 finish_expr_stmt (init);
6134 if (flag_threadsafe_statics)
6136 finish_compound_stmt (inner_then_clause);
6137 finish_then_clause (inner_if_stmt);
6138 finish_if_stmt (inner_if_stmt);
6141 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6143 finish_compound_stmt (then_clause);
6144 finish_then_clause (if_stmt);
6145 finish_if_stmt (if_stmt);
6149 static_aggregates = tree_cons (init, decl, static_aggregates);
6153 /* Make TYPE a complete type based on INITIAL_VALUE.
6154 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
6155 2 if there was no information (in which case assume 0 if DO_DEFAULT),
6156 3 if the initializer list is empty (in pedantic mode). */
6159 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
6162 tree type, elt_type;
6166 unsigned HOST_WIDE_INT i;
6169 /* An array of character type can be initialized from a
6170 brace-enclosed string constant.
6172 FIXME: this code is duplicated from reshape_init. Probably
6173 we should just call reshape_init here? */
6174 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
6175 && TREE_CODE (initial_value) == CONSTRUCTOR
6176 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
6178 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
6179 tree value = VEC_index (constructor_elt, v, 0)->value;
6181 if (TREE_CODE (value) == STRING_CST
6182 && VEC_length (constructor_elt, v) == 1)
6183 initial_value = value;
6186 /* If any of the elements are parameter packs, we can't actually
6187 complete this type now because the array size is dependent. */
6188 if (TREE_CODE (initial_value) == CONSTRUCTOR)
6190 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value),
6193 if (PACK_EXPANSION_P (value))
6199 failure = complete_array_type (ptype, initial_value, do_default);
6201 /* We can create the array before the element type is complete, which
6202 means that we didn't have these two bits set in the original type
6203 either. In completing the type, we are expected to propagate these
6204 bits. See also complete_type which does the same thing for arrays
6207 if (TYPE_DOMAIN (type))
6209 elt_type = TREE_TYPE (type);
6210 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
6211 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
6212 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
6218 /* Return zero if something is declared to be a member of type
6219 CTYPE when in the context of CUR_TYPE. STRING is the error
6220 message to print in that case. Otherwise, quietly return 1. */
6223 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
6225 if (ctype && ctype != cur_type)
6227 if (flags == DTOR_FLAG)
6228 error ("destructor for alien class %qT cannot be a member", ctype);
6230 error ("constructor for alien class %qT cannot be a member", ctype);
6236 /* Subroutine of `grokdeclarator'. */
6238 /* Generate errors possibly applicable for a given set of specifiers.
6239 This is for ARM $7.1.2. */
6242 bad_specifiers (tree object,
6251 error ("%qD declared as a %<virtual%> %s", object, type);
6253 error ("%qD declared as an %<inline%> %s", object, type);
6255 error ("%<const%> and %<volatile%> function specifiers on "
6256 "%qD invalid in %s declaration",
6259 error ("%q+D declared as a friend", object);
6261 && (TREE_CODE (object) == TYPE_DECL
6262 || (!TYPE_PTRFN_P (TREE_TYPE (object))
6263 && !TYPE_REFFN_P (TREE_TYPE (object))
6264 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
6265 error ("%q+D declared with an exception specification", object);
6268 /* DECL is a member function or static data member and is presently
6269 being defined. Check that the definition is taking place in a
6273 check_class_member_definition_namespace (tree decl)
6275 /* These checks only apply to member functions and static data
6277 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
6278 || TREE_CODE (decl) == VAR_DECL);
6279 /* We check for problems with specializations in pt.c in
6280 check_specialization_namespace, where we can issue better
6282 if (processing_specialization)
6284 /* There are no restrictions on the placement of
6285 explicit instantiations. */
6286 if (processing_explicit_instantiation)
6290 A member function definition that appears outside of the
6291 class definition shall appear in a namespace scope enclosing
6292 the class definition.
6296 The definition for a static data member shall appear in a
6297 namespace scope enclosing the member's class definition. */
6298 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
6299 pedwarn ("definition of %qD is not in namespace enclosing %qT",
6300 decl, DECL_CONTEXT (decl));
6303 /* Build a PARM_DECL for the "this" parameter. TYPE is the
6304 METHOD_TYPE for a non-static member function; QUALS are the
6305 cv-qualifiers that apply to the function. */
6308 build_this_parm (tree type, cp_cv_quals quals)
6313 cp_cv_quals this_quals;
6315 this_type = TREE_VALUE (TYPE_ARG_TYPES (type));
6316 /* The `this' parameter is implicitly `const'; it cannot be
6318 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
6319 qual_type = cp_build_qualified_type (this_type, this_quals);
6320 parm = build_artificial_parm (this_identifier, qual_type);
6321 cp_apply_type_quals_to_decl (this_quals, parm);
6325 /* CTYPE is class type, or null if non-class.
6326 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
6328 DECLARATOR is the function's name.
6329 PARMS is a chain of PARM_DECLs for the function.
6330 VIRTUALP is truthvalue of whether the function is virtual or not.
6331 FLAGS are to be passed through to `grokclassfn'.
6332 QUALS are qualifiers indicating whether the function is `const'
6334 RAISES is a list of exceptions that this function can raise.
6335 CHECK is 1 if we must find this method in CTYPE, 0 if we should
6336 not look, and -1 if we should not call `grokclassfn' at all.
6338 SFK is the kind of special function (if any) for the new function.
6340 Returns `NULL_TREE' if something goes wrong, after issuing
6341 applicable error messages. */
6344 grokfndecl (tree ctype,
6348 tree orig_declarator,
6350 enum overload_flags flags,
6357 special_function_kind sfk,
6364 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
6368 type = build_exception_variant (type, raises);
6370 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
6371 if (TREE_CODE (type) == METHOD_TYPE)
6374 parm = build_this_parm (type, quals);
6375 TREE_CHAIN (parm) = parms;
6378 DECL_ARGUMENTS (decl) = parms;
6379 /* Propagate volatile out from type to decl. */
6380 if (TYPE_VOLATILE (type))
6381 TREE_THIS_VOLATILE (decl) = 1;
6383 /* Setup decl according to sfk. */
6386 case sfk_constructor:
6387 case sfk_copy_constructor:
6388 DECL_CONSTRUCTOR_P (decl) = 1;
6390 case sfk_destructor:
6391 DECL_DESTRUCTOR_P (decl) = 1;
6397 /* If pointers to member functions use the least significant bit to
6398 indicate whether a function is virtual, ensure a pointer
6399 to this function will have that bit clear. */
6400 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
6401 && TREE_CODE (type) == METHOD_TYPE
6402 && DECL_ALIGN (decl) < 2 * BITS_PER_UNIT)
6403 DECL_ALIGN (decl) = 2 * BITS_PER_UNIT;
6406 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
6410 ("defining explicit specialization %qD in friend declaration",
6414 tree fns = TREE_OPERAND (orig_declarator, 0);
6415 tree args = TREE_OPERAND (orig_declarator, 1);
6417 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
6419 /* Something like `template <class T> friend void f<T>()'. */
6420 error ("invalid use of template-id %qD in declaration "
6421 "of primary template",
6427 /* A friend declaration of the form friend void f<>(). Record
6428 the information in the TEMPLATE_ID_EXPR. */
6429 SET_DECL_IMPLICIT_INSTANTIATION (decl);
6431 if (TREE_CODE (fns) == COMPONENT_REF)
6433 /* Due to bison parser ickiness, we will have already looked
6434 up an operator_name or PFUNCNAME within the current class
6435 (see template_id in parse.y). If the current class contains
6436 such a name, we'll get a COMPONENT_REF here. Undo that. */
6438 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
6439 == current_class_type);
6440 fns = TREE_OPERAND (fns, 1);
6442 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
6443 || TREE_CODE (fns) == OVERLOAD);
6444 DECL_TEMPLATE_INFO (decl) = tree_cons (fns, args, NULL_TREE);
6446 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
6447 if (TREE_PURPOSE (t)
6448 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
6450 error ("default arguments are not allowed in declaration "
6451 "of friend template specialization %qD",
6458 error ("%<inline%> is not allowed in declaration of friend "
6459 "template specialization %qD",
6466 /* If this decl has namespace scope, set that up. */
6468 set_decl_namespace (decl, in_namespace, friendp);
6470 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
6472 /* `main' and builtins have implicit 'C' linkage. */
6473 if ((MAIN_NAME_P (declarator)
6474 || (IDENTIFIER_LENGTH (declarator) > 10
6475 && IDENTIFIER_POINTER (declarator)[0] == '_'
6476 && IDENTIFIER_POINTER (declarator)[1] == '_'
6477 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
6478 && current_lang_name == lang_name_cplusplus
6479 && ctype == NULL_TREE
6480 /* NULL_TREE means global namespace. */
6481 && DECL_CONTEXT (decl) == NULL_TREE)
6482 SET_DECL_LANGUAGE (decl, lang_c);
6484 /* Should probably propagate const out from type to decl I bet (mrs). */
6487 DECL_STATIC_FUNCTION_P (decl) = 1;
6488 DECL_CONTEXT (decl) = ctype;
6493 DECL_CONTEXT (decl) = ctype;
6495 check_class_member_definition_namespace (decl);
6498 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
6500 if (processing_template_decl)
6501 error ("cannot declare %<::main%> to be a template");
6503 error ("cannot declare %<::main%> to be inline");
6505 error ("cannot declare %<::main%> to be static");
6510 /* Members of anonymous types and local classes have no linkage; make
6511 them internal. If a typedef is made later, this will be changed. */
6512 if (ctype && (TYPE_ANONYMOUS_P (ctype)
6513 || decl_function_context (TYPE_MAIN_DECL (ctype))))
6518 /* [basic.link]: A name with no linkage (notably, the name of a class
6519 or enumeration declared in a local scope) shall not be used to
6520 declare an entity with linkage.
6522 Only check this for public decls for now. See core 319, 389. */
6523 t = no_linkage_check (TREE_TYPE (decl),
6524 /*relaxed_p=*/false);
6527 if (TYPE_ANONYMOUS_P (t))
6529 if (DECL_EXTERN_C_P (decl))
6530 /* Allow this; it's pretty common in C. */;
6533 pedwarn ("non-local function %q#D uses anonymous type",
6535 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
6536 pedwarn ("%q+#D does not refer to the unqualified "
6537 "type, so it is not used for linkage",
6542 pedwarn ("non-local function %q#D uses local type %qT", decl, t);
6546 TREE_PUBLIC (decl) = publicp;
6549 DECL_INTERFACE_KNOWN (decl) = 1;
6550 DECL_NOT_REALLY_EXTERN (decl) = 1;
6553 /* If the declaration was declared inline, mark it as such. */
6555 DECL_DECLARED_INLINE_P (decl) = 1;
6556 /* We inline functions that are explicitly declared inline, or, when
6557 the user explicitly asks us to, all functions. */
6558 if (DECL_DECLARED_INLINE_P (decl)
6559 || (flag_inline_trees == 2 && !DECL_INLINE (decl) && funcdef_flag))
6560 DECL_INLINE (decl) = 1;
6562 DECL_EXTERNAL (decl) = 1;
6563 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
6566 ? G_("static member function %qD cannot have cv-qualifier")
6567 : G_("non-member function %qD cannot have cv-qualifier"),
6569 quals = TYPE_UNQUALIFIED;
6572 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
6573 && !grok_op_properties (decl, /*complain=*/true))
6576 if (ctype && decl_function_context (decl))
6577 DECL_NO_STATIC_CHAIN (decl) = 1;
6580 /* Make the init_value nonzero so pushdecl knows this is not
6581 tentative. error_mark_node is replaced later with the BLOCK. */
6582 DECL_INITIAL (decl) = error_mark_node;
6584 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
6585 TREE_NOTHROW (decl) = 1;
6587 /* Caller will do the rest of this. */
6591 if (ctype != NULL_TREE)
6592 grokclassfn (ctype, decl, flags);
6594 decl = check_explicit_specialization (orig_declarator, decl,
6597 4 * (friendp != 0));
6598 if (decl == error_mark_node)
6603 cplus_decl_attributes (&decl, *attrlist, 0);
6604 *attrlist = NULL_TREE;
6607 /* Check main's type after attributes have been applied. */
6608 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
6610 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
6613 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
6615 error ("%<::main%> must return %<int%>");
6616 newtype = build_function_type (integer_type_node, oldtypeargs);
6617 TREE_TYPE (decl) = newtype;
6619 check_main_parameter_types (decl);
6622 if (ctype != NULL_TREE
6623 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
6626 tree old_decl = check_classfn (ctype, decl,
6627 (processing_template_decl
6628 > template_class_depth (ctype))
6629 ? current_template_parms
6632 if (old_decl == error_mark_node)
6640 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
6641 /* Because grokfndecl is always supposed to return a
6642 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
6643 here. We depend on our callers to figure out that its
6644 really a template that's being returned. */
6645 old_decl = DECL_TEMPLATE_RESULT (old_decl);
6647 if (DECL_STATIC_FUNCTION_P (old_decl)
6648 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
6649 /* Remove the `this' parm added by grokclassfn.
6650 XXX Isn't this done in start_function, too? */
6651 revert_static_member_fn (decl);
6652 if (DECL_ARTIFICIAL (old_decl))
6654 error ("definition of implicitly-declared %qD", old_decl);
6658 /* Since we've smashed OLD_DECL to its
6659 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
6660 if (TREE_CODE (decl) == TEMPLATE_DECL)
6661 decl = DECL_TEMPLATE_RESULT (decl);
6663 /* Attempt to merge the declarations. This can fail, in
6664 the case of some invalid specialization declarations. */
6665 pushed_scope = push_scope (ctype);
6666 ok = duplicate_decls (decl, old_decl, friendp);
6668 pop_scope (pushed_scope);
6671 error ("no %q#D member function declared in class %qT",
6679 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
6682 if (ctype == NULL_TREE || check)
6686 DECL_VIRTUAL_P (decl) = 1;
6691 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
6692 the linkage that DECL will receive in the object file. */
6695 set_linkage_for_static_data_member (tree decl)
6697 /* A static data member always has static storage duration and
6698 external linkage. Note that static data members are forbidden in
6699 local classes -- the only situation in which a class has
6700 non-external linkage. */
6701 TREE_PUBLIC (decl) = 1;
6702 TREE_STATIC (decl) = 1;
6703 /* For non-template classes, static data members are always put
6704 out in exactly those files where they are defined, just as
6705 with ordinary namespace-scope variables. */
6706 if (!processing_template_decl)
6707 DECL_INTERFACE_KNOWN (decl) = 1;
6710 /* Create a VAR_DECL named NAME with the indicated TYPE.
6712 If SCOPE is non-NULL, it is the class type or namespace containing
6713 the variable. If SCOPE is NULL, the variable should is created in
6714 the innermost enclosings scope. */
6717 grokvardecl (tree type,
6719 const cp_decl_specifier_seq *declspecs,
6725 tree explicit_scope;
6727 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
6729 /* Compute the scope in which to place the variable, but remember
6730 whether or not that scope was explicitly specified by the user. */
6731 explicit_scope = scope;
6734 /* An explicit "extern" specifier indicates a namespace-scope
6736 if (declspecs->storage_class == sc_extern)
6737 scope = current_namespace;
6738 else if (!at_function_scope_p ())
6739 scope = current_scope ();
6743 && (/* If the variable is a namespace-scope variable declared in a
6744 template, we need DECL_LANG_SPECIFIC. */
6745 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
6746 /* Similarly for namespace-scope variables with language linkage
6748 || (TREE_CODE (scope) == NAMESPACE_DECL
6749 && current_lang_name != lang_name_cplusplus)
6750 /* Similarly for static data members. */
6752 decl = build_lang_decl (VAR_DECL, name, type);
6754 decl = build_decl (VAR_DECL, name, type);
6756 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
6757 set_decl_namespace (decl, explicit_scope, 0);
6759 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
6761 if (declspecs->storage_class == sc_extern)
6763 DECL_THIS_EXTERN (decl) = 1;
6764 DECL_EXTERNAL (decl) = !initialized;
6767 if (DECL_CLASS_SCOPE_P (decl))
6769 set_linkage_for_static_data_member (decl);
6770 /* This function is only called with out-of-class definitions. */
6771 DECL_EXTERNAL (decl) = 0;
6772 check_class_member_definition_namespace (decl);
6774 /* At top level, either `static' or no s.c. makes a definition
6775 (perhaps tentative), and absence of `static' makes it public. */
6776 else if (toplevel_bindings_p ())
6778 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
6779 && (DECL_THIS_EXTERN (decl) || ! constp));
6780 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
6782 /* Not at top level, only `static' makes a static definition. */
6785 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
6786 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
6789 if (declspecs->specs[(int)ds_thread])
6790 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
6792 if (TREE_PUBLIC (decl))
6794 /* [basic.link]: A name with no linkage (notably, the name of a class
6795 or enumeration declared in a local scope) shall not be used to
6796 declare an entity with linkage.
6798 Only check this for public decls for now. */
6799 tree t = no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false);
6802 if (TYPE_ANONYMOUS_P (t))
6804 if (DECL_EXTERN_C_P (decl))
6805 /* Allow this; it's pretty common in C. */
6809 /* DRs 132, 319 and 389 seem to indicate types with
6810 no linkage can only be used to declare extern "C"
6811 entities. Since it's not always an error in the
6812 ISO C++ 90 Standard, we only issue a warning. */
6813 warning (0, "non-local variable %q#D uses anonymous type",
6815 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
6816 warning (0, "%q+#D does not refer to the unqualified "
6817 "type, so it is not used for linkage",
6822 warning (0, "non-local variable %q#D uses local type %qT", decl, t);
6826 DECL_INTERFACE_KNOWN (decl) = 1;
6831 /* Create and return a canonical pointer to member function type, for
6832 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
6835 build_ptrmemfunc_type (tree type)
6839 tree unqualified_variant = NULL_TREE;
6841 if (type == error_mark_node)
6844 /* If a canonical type already exists for this type, use it. We use
6845 this method instead of type_hash_canon, because it only does a
6846 simple equality check on the list of field members. */
6848 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
6851 /* Make sure that we always have the unqualified pointer-to-member
6853 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
6855 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
6857 t = make_aggr_type (RECORD_TYPE);
6858 xref_basetypes (t, NULL_TREE);
6860 /* Let the front end know this is a pointer to member function... */
6861 TYPE_PTRMEMFUNC_FLAG (t) = 1;
6862 /* ... and not really an aggregate. */
6863 SET_IS_AGGR_TYPE (t, 0);
6865 field = build_decl (FIELD_DECL, pfn_identifier, type);
6868 field = build_decl (FIELD_DECL, delta_identifier, delta_type_node);
6869 TREE_CHAIN (field) = fields;
6872 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
6874 /* Zap out the name so that the back end will give us the debugging
6875 information for this anonymous RECORD_TYPE. */
6876 TYPE_NAME (t) = NULL_TREE;
6878 /* If this is not the unqualified form of this pointer-to-member
6879 type, set the TYPE_MAIN_VARIANT for this type to be the
6880 unqualified type. Since they are actually RECORD_TYPEs that are
6881 not variants of each other, we must do this manually. */
6882 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
6884 t = build_qualified_type (t, cp_type_quals (type));
6885 TYPE_MAIN_VARIANT (t) = unqualified_variant;
6886 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
6887 TYPE_NEXT_VARIANT (unqualified_variant) = t;
6890 /* Cache this pointer-to-member type so that we can find it again
6892 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
6894 /* Managing canonical types for the RECORD_TYPE behind a
6895 pointer-to-member function is a nightmare, so use structural
6896 equality for now. */
6897 SET_TYPE_STRUCTURAL_EQUALITY (t);
6902 /* Create and return a pointer to data member type. */
6905 build_ptrmem_type (tree class_type, tree member_type)
6907 if (TREE_CODE (member_type) == METHOD_TYPE)
6911 arg_types = TYPE_ARG_TYPES (member_type);
6912 class_type = (cp_build_qualified_type
6914 cp_type_quals (TREE_TYPE (TREE_VALUE (arg_types)))));
6916 = build_method_type_directly (class_type,
6917 TREE_TYPE (member_type),
6918 TREE_CHAIN (arg_types));
6919 return build_ptrmemfunc_type (build_pointer_type (member_type));
6923 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
6924 return build_offset_type (class_type, member_type);
6928 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
6929 Check to see that the definition is valid. Issue appropriate error
6930 messages. Return 1 if the definition is particularly bad, or 0
6934 check_static_variable_definition (tree decl, tree type)
6936 /* Motion 10 at San Diego: If a static const integral data member is
6937 initialized with an integral constant expression, the initializer
6938 may appear either in the declaration (within the class), or in
6939 the definition, but not both. If it appears in the class, the
6940 member is a member constant. The file-scope definition is always
6942 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
6944 error ("invalid in-class initialization of static data member "
6945 "of non-integral type %qT",
6947 /* If we just return the declaration, crashes will sometimes
6948 occur. We therefore return void_type_node, as if this were a
6949 friend declaration, to cause callers to completely ignore
6950 this declaration. */
6953 else if (!CP_TYPE_CONST_P (type))
6954 error ("ISO C++ forbids in-class initialization of non-const "
6955 "static member %qD",
6957 else if (pedantic && !INTEGRAL_TYPE_P (type))
6958 pedwarn ("ISO C++ forbids initialization of member constant "
6959 "%qD of non-integral type %qT", decl, type);
6964 /* Given the SIZE (i.e., number of elements) in an array, compute an
6965 appropriate index type for the array. If non-NULL, NAME is the
6966 name of the thing being declared. */
6969 compute_array_index_type (tree name, tree size)
6973 tree abi_1_itype = NULL_TREE;
6975 if (error_operand_p (size))
6976 return error_mark_node;
6978 type = TREE_TYPE (size);
6979 /* The array bound must be an integer type. */
6980 if (!dependent_type_p (type) && !INTEGRAL_TYPE_P (type))
6983 error ("size of array %qD has non-integral type %qT", name, type);
6985 error ("size of array has non-integral type %qT", type);
6986 size = integer_one_node;
6987 type = TREE_TYPE (size);
6990 if (value_dependent_expression_p (size))
6992 /* We cannot do any checking for a value-dependent SIZE. Just
6993 build the index type and mark that it requires structural
6995 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
6996 size, integer_one_node));
6997 SET_TYPE_STRUCTURAL_EQUALITY (itype);
7001 if (!abi_version_at_least (2) && processing_template_decl)
7002 /* For abi-1, we handled all instances in templates the same way,
7003 even when they were non-dependent. This effects the manglings
7004 produced. So, we do the normal checking for non-dependent
7005 sizes, but at the end we'll return the same type that abi-1
7006 would have, but with TYPE_CANONICAL set to the "right"
7007 value that the current ABI would provide. */
7008 abi_1_itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7009 size, integer_one_node));
7011 /* The size might be the result of a cast. */
7012 STRIP_TYPE_NOPS (size);
7014 /* It might be a const variable or enumeration constant. */
7015 size = integral_constant_value (size);
7017 /* Normally, the array-bound will be a constant. */
7018 if (TREE_CODE (size) == INTEGER_CST)
7020 /* Check to see if the array bound overflowed. Make that an
7021 error, no matter how generous we're being. */
7022 int old_flag_pedantic_errors = flag_pedantic_errors;
7023 int old_pedantic = pedantic;
7024 pedantic = flag_pedantic_errors = 1;
7025 constant_expression_warning (size);
7026 pedantic = old_pedantic;
7027 flag_pedantic_errors = old_flag_pedantic_errors;
7029 /* An array must have a positive number of elements. */
7030 if (INT_CST_LT (size, integer_zero_node))
7033 error ("size of array %qD is negative", name);
7035 error ("size of array is negative");
7036 size = integer_one_node;
7038 /* As an extension we allow zero-sized arrays. We always allow
7039 them in system headers because glibc uses them. */
7040 else if (integer_zerop (size) && pedantic && !in_system_header)
7043 pedwarn ("ISO C++ forbids zero-size array %qD", name);
7045 pedwarn ("ISO C++ forbids zero-size array");
7048 else if (TREE_CONSTANT (size))
7050 /* `(int) &fn' is not a valid array bound. */
7052 error ("size of array %qD is not an integral constant-expression",
7055 error ("size of array is not an integral constant-expression");
7056 size = integer_one_node;
7058 else if (pedantic && warn_vla != 0)
7061 pedwarn ("ISO C++ forbids variable length array %qD", name);
7063 pedwarn ("ISO C++ forbids variable length array");
7065 else if (warn_vla > 0)
7069 "variable length array %qD is used", name);
7072 "variable length array is used");
7075 if (processing_template_decl && !TREE_CONSTANT (size))
7076 /* A variable sized array. */
7077 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
7080 HOST_WIDE_INT saved_processing_template_decl;
7082 /* Compute the index of the largest element in the array. It is
7083 one less than the number of elements in the array. We save
7084 and restore PROCESSING_TEMPLATE_DECL so that computations in
7085 cp_build_binary_op will be appropriately folded. */
7086 saved_processing_template_decl = processing_template_decl;
7087 processing_template_decl = 0;
7088 itype = cp_build_binary_op (MINUS_EXPR,
7089 cp_convert (ssizetype, size),
7090 cp_convert (ssizetype, integer_one_node));
7091 itype = fold (itype);
7092 processing_template_decl = saved_processing_template_decl;
7094 if (!TREE_CONSTANT (itype))
7095 /* A variable sized array. */
7096 itype = variable_size (itype);
7097 /* Make sure that there was no overflow when creating to a signed
7098 index type. (For example, on a 32-bit machine, an array with
7099 size 2^32 - 1 is too big.) */
7100 else if (TREE_CODE (itype) == INTEGER_CST
7101 && TREE_OVERFLOW (itype))
7103 error ("overflow in array dimension");
7104 TREE_OVERFLOW (itype) = 0;
7108 /* Create and return the appropriate index type. */
7111 tree t = build_index_type (itype);
7112 TYPE_CANONICAL (abi_1_itype) = TYPE_CANONICAL (t);
7116 return build_index_type (itype);
7119 /* Returns the scope (if any) in which the entity declared by
7120 DECLARATOR will be located. If the entity was declared with an
7121 unqualified name, NULL_TREE is returned. */
7124 get_scope_of_declarator (const cp_declarator *declarator)
7126 while (declarator && declarator->kind != cdk_id)
7127 declarator = declarator->declarator;
7129 /* If the declarator-id is a SCOPE_REF, the scope in which the
7130 declaration occurs is the first operand. */
7132 && declarator->u.id.qualifying_scope)
7133 return declarator->u.id.qualifying_scope;
7135 /* Otherwise, the declarator is not a qualified name; the entity will
7136 be declared in the current scope. */
7140 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
7141 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
7145 create_array_type_for_decl (tree name, tree type, tree size)
7147 tree itype = NULL_TREE;
7148 const char* error_msg;
7150 /* If things have already gone awry, bail now. */
7151 if (type == error_mark_node || size == error_mark_node)
7152 return error_mark_node;
7154 /* Assume that everything will go OK. */
7157 /* There are some types which cannot be array elements. */
7158 switch (TREE_CODE (type))
7161 error_msg = "array of void";
7165 error_msg = "array of functions";
7168 case REFERENCE_TYPE:
7169 error_msg = "array of references";
7173 error_msg = "array of function members";
7180 /* If something went wrong, issue an error-message and return. */
7184 error ("declaration of %qD as %s", name, error_msg);
7186 error ("creating %s", error_msg);
7188 return error_mark_node;
7193 The constant expressions that specify the bounds of the arrays
7194 can be omitted only for the first member of the sequence. */
7195 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
7198 error ("declaration of %qD as multidimensional array must "
7199 "have bounds for all dimensions except the first",
7202 error ("multidimensional array must have bounds for all "
7203 "dimensions except the first");
7205 return error_mark_node;
7208 /* Figure out the index type for the array. */
7210 itype = compute_array_index_type (name, size);
7213 T is called the array element type; this type shall not be [...] an
7214 abstract class type. */
7215 abstract_virtuals_error (name, type);
7217 return build_cplus_array_type (type, itype);
7220 /* Check that it's OK to declare a function with the indicated TYPE.
7221 SFK indicates the kind of special function (if any) that this
7222 function is. OPTYPE is the type given in a conversion operator
7223 declaration, or the class type for a constructor/destructor.
7224 Returns the actual return type of the function; that
7225 may be different than TYPE if an error occurs, or for certain
7226 special functions. */
7229 check_special_function_return_type (special_function_kind sfk,
7235 case sfk_constructor:
7237 error ("return type specification for constructor invalid");
7239 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7240 type = build_pointer_type (optype);
7242 type = void_type_node;
7245 case sfk_destructor:
7247 error ("return type specification for destructor invalid");
7248 /* We can't use the proper return type here because we run into
7249 problems with ambiguous bases and covariant returns.
7250 Java classes are left unchanged because (void *) isn't a valid
7251 Java type, and we don't want to change the Java ABI. */
7252 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7253 type = build_pointer_type (void_type_node);
7255 type = void_type_node;
7258 case sfk_conversion:
7260 error ("return type specified for %<operator %T%>", optype);
7271 /* A variable or data member (whose unqualified name is IDENTIFIER)
7272 has been declared with the indicated TYPE. If the TYPE is not
7273 acceptable, issue an error message and return a type to use for
7274 error-recovery purposes. */
7277 check_var_type (tree identifier, tree type)
7279 if (VOID_TYPE_P (type))
7282 error ("unnamed variable or field declared void");
7283 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
7285 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
7286 error ("variable or field %qE declared void", identifier);
7289 error ("variable or field declared void");
7290 type = error_mark_node;
7296 /* Given declspecs and a declarator (abstract or otherwise), determine
7297 the name and type of the object declared and construct a DECL node
7300 DECLSPECS points to the representation of declaration-specifier
7301 sequence that precedes declarator.
7303 DECL_CONTEXT says which syntactic context this declaration is in:
7304 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
7305 FUNCDEF for a function definition. Like NORMAL but a few different
7306 error messages in each case. Return value may be zero meaning
7307 this definition is too screwy to try to parse.
7308 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
7309 handle member functions (which have FIELD context).
7310 Return value may be zero meaning this definition is too screwy to
7312 PARM for a parameter declaration (either within a function prototype
7313 or before a function body). Make a PARM_DECL, or return void_type_node.
7314 CATCHPARM for a parameter declaration before a catch clause.
7315 TYPENAME if for a typename (in a cast or sizeof).
7316 Don't make a DECL node; just return the ..._TYPE node.
7317 FIELD for a struct or union field; make a FIELD_DECL.
7318 BITFIELD for a field with specified width.
7319 INITIALIZED is 1 if the decl has an initializer.
7321 ATTRLIST is a pointer to the list of attributes, which may be NULL
7322 if there are none; *ATTRLIST may be modified if attributes from inside
7323 the declarator should be applied to the declaration.
7325 When this function is called, scoping variables (such as
7326 CURRENT_CLASS_TYPE) should reflect the scope in which the
7327 declaration occurs, not the scope in which the new declaration will
7328 be placed. For example, on:
7332 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
7335 Returns a DECL (if a declarator is present), a TYPE (if there is no
7336 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
7340 grokdeclarator (const cp_declarator *declarator,
7341 const cp_decl_specifier_seq *declspecs,
7342 enum decl_context decl_context,
7346 tree type = NULL_TREE;
7348 int virtualp, explicitp, friendp, inlinep, staticp;
7349 int explicit_int = 0;
7350 int explicit_char = 0;
7351 int defaulted_int = 0;
7352 tree dependent_name = NULL_TREE;
7354 tree typedef_decl = NULL_TREE;
7355 const char *name = NULL;
7356 tree typedef_type = NULL_TREE;
7357 /* True if this declarator is a function definition. */
7358 bool funcdef_flag = false;
7359 cp_declarator_kind innermost_code = cdk_error;
7362 /* See the code below that used this. */
7363 tree decl_attr = NULL_TREE;
7366 /* Keep track of what sort of function is being processed
7367 so that we can warn about default return values, or explicit
7368 return values which do not match prescribed defaults. */
7369 special_function_kind sfk = sfk_none;
7371 tree dname = NULL_TREE;
7372 tree ctor_return_type = NULL_TREE;
7373 enum overload_flags flags = NO_SPECIAL;
7374 /* cv-qualifiers that apply to the declarator, for a declaration of
7375 a member function. */
7376 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
7377 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
7379 tree raises = NULL_TREE;
7380 int template_count = 0;
7381 tree returned_attrs = NULL_TREE;
7382 tree parms = NULL_TREE;
7383 const cp_declarator *id_declarator;
7384 /* The unqualified name of the declarator; either an
7385 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
7386 tree unqualified_id;
7387 /* The class type, if any, in which this entity is located,
7388 or NULL_TREE if none. Note that this value may be different from
7389 the current class type; for example if an attempt is made to declare
7390 "A::f" inside "B", this value will be "A". */
7391 tree ctype = current_class_type;
7392 /* The NAMESPACE_DECL for the namespace in which this entity is
7393 located. If an unqualified name is used to declare the entity,
7394 this value will be NULL_TREE, even if the entity is located at
7396 tree in_namespace = NULL_TREE;
7397 cp_storage_class storage_class;
7398 bool unsigned_p, signed_p, short_p, long_p, thread_p;
7399 bool type_was_error_mark_node = false;
7400 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
7401 bool set_no_warning = false;
7403 signed_p = declspecs->specs[(int)ds_signed];
7404 unsigned_p = declspecs->specs[(int)ds_unsigned];
7405 short_p = declspecs->specs[(int)ds_short];
7406 long_p = declspecs->specs[(int)ds_long];
7407 longlong = declspecs->specs[(int)ds_long] >= 2;
7408 thread_p = declspecs->specs[(int)ds_thread];
7410 if (decl_context == FUNCDEF)
7411 funcdef_flag = true, decl_context = NORMAL;
7412 else if (decl_context == MEMFUNCDEF)
7413 funcdef_flag = true, decl_context = FIELD;
7414 else if (decl_context == BITFIELD)
7415 bitfield = 1, decl_context = FIELD;
7417 /* Look inside a declarator for the name being declared
7418 and get it as a string, for an error message. */
7419 for (id_declarator = declarator;
7421 id_declarator = id_declarator->declarator)
7423 if (id_declarator->kind != cdk_id)
7424 innermost_code = id_declarator->kind;
7426 switch (id_declarator->kind)
7429 if (id_declarator->declarator
7430 && id_declarator->declarator->kind == cdk_id)
7432 sfk = id_declarator->declarator->u.id.sfk;
7433 if (sfk == sfk_destructor)
7440 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
7441 tree decl = id_declarator->u.id.unqualified_name;
7444 if (qualifying_scope)
7446 if (at_function_scope_p ())
7450 A declarator-id shall not be qualified except
7453 None of the cases are permitted in block
7455 if (qualifying_scope == global_namespace)
7456 error ("invalid use of qualified-name %<::%D%>",
7458 else if (TYPE_P (qualifying_scope))
7459 error ("invalid use of qualified-name %<%T::%D%>",
7460 qualifying_scope, decl);
7462 error ("invalid use of qualified-name %<%D::%D%>",
7463 qualifying_scope, decl);
7464 return error_mark_node;
7466 else if (TYPE_P (qualifying_scope))
7468 ctype = qualifying_scope;
7469 if (innermost_code != cdk_function
7470 && current_class_type
7471 && !UNIQUELY_DERIVED_FROM_P (ctype,
7472 current_class_type))
7474 error ("type %qT is not derived from type %qT",
7475 ctype, current_class_type);
7476 return error_mark_node;
7479 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
7480 in_namespace = qualifying_scope;
7482 switch (TREE_CODE (decl))
7488 if (innermost_code != cdk_function)
7490 error ("declaration of %qD as non-function", decl);
7491 return error_mark_node;
7493 else if (!qualifying_scope
7494 && !(current_class_type && at_class_scope_p ()))
7496 error ("declaration of %qD as non-member", decl);
7497 return error_mark_node;
7500 type = TREE_OPERAND (decl, 0);
7501 name = IDENTIFIER_POINTER (constructor_name (type));
7506 case TEMPLATE_ID_EXPR:
7508 tree fns = TREE_OPERAND (decl, 0);
7511 if (TREE_CODE (dname) != IDENTIFIER_NODE)
7513 gcc_assert (is_overloaded_fn (dname));
7514 dname = DECL_NAME (get_first_fn (dname));
7519 case IDENTIFIER_NODE:
7520 if (TREE_CODE (decl) == IDENTIFIER_NODE)
7523 if (C_IS_RESERVED_WORD (dname))
7525 error ("declarator-id missing; using reserved word %qD",
7527 name = IDENTIFIER_POINTER (dname);
7529 else if (!IDENTIFIER_TYPENAME_P (dname))
7530 name = IDENTIFIER_POINTER (dname);
7533 gcc_assert (flags == NO_SPECIAL);
7534 flags = TYPENAME_FLAG;
7535 ctor_return_type = TREE_TYPE (dname);
7536 sfk = sfk_conversion;
7537 if (is_typename_at_global_scope (dname))
7538 name = IDENTIFIER_POINTER (dname);
7540 name = "<invalid operator>";
7557 return error_mark_node;
7562 if (id_declarator->kind == cdk_id)
7568 The declarator in a function-definition shall have the form
7569 D1 ( parameter-declaration-clause) ... */
7570 if (funcdef_flag && innermost_code != cdk_function)
7572 error ("function definition does not declare parameters");
7573 return error_mark_node;
7576 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
7577 && innermost_code != cdk_function
7578 && ! (ctype && !declspecs->any_specifiers_p))
7580 error ("declaration of %qD as non-function", dname);
7581 return error_mark_node;
7584 /* Anything declared one level down from the top level
7585 must be one of the parameters of a function
7586 (because the body is at least two levels down). */
7588 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
7589 by not allowing C++ class definitions to specify their parameters
7590 with xdecls (must be spec.d in the parmlist).
7592 Since we now wait to push a class scope until we are sure that
7593 we are in a legitimate method context, we must set oldcname
7594 explicitly (since current_class_name is not yet alive).
7596 We also want to avoid calling this a PARM if it is in a namespace. */
7598 if (decl_context == NORMAL && !toplevel_bindings_p ())
7600 struct cp_binding_level *b = current_binding_level;
7601 current_binding_level = b->level_chain;
7602 if (current_binding_level != 0 && toplevel_bindings_p ())
7603 decl_context = PARM;
7604 current_binding_level = b;
7608 name = decl_context == PARM ? "parameter" : "type name";
7610 /* If there were multiple types specified in the decl-specifier-seq,
7611 issue an error message. */
7612 if (declspecs->multiple_types_p)
7614 error ("two or more data types in declaration of %qs", name);
7615 return error_mark_node;
7618 if (declspecs->conflicting_specifiers_p)
7620 error ("conflicting specifiers in declaration of %qs", name);
7621 return error_mark_node;
7624 /* Extract the basic type from the decl-specifier-seq. */
7625 type = declspecs->type;
7626 if (type == error_mark_node)
7629 type_was_error_mark_node = true;
7631 /* If the entire declaration is itself tagged as deprecated then
7632 suppress reports of deprecated items. */
7633 if (type && TREE_DEPRECATED (type)
7634 && deprecated_state != DEPRECATED_SUPPRESS)
7635 warn_deprecated_use (type);
7636 if (type && TREE_CODE (type) == TYPE_DECL)
7638 typedef_decl = type;
7639 type = TREE_TYPE (typedef_decl);
7640 if (TREE_DEPRECATED (type)
7641 && DECL_ARTIFICIAL (typedef_decl)
7642 && deprecated_state != DEPRECATED_SUPPRESS)
7643 warn_deprecated_use (type);
7645 /* No type at all: default to `int', and set DEFAULTED_INT
7646 because it was not a user-defined typedef. */
7647 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
7649 /* These imply 'int'. */
7650 type = integer_type_node;
7654 explicit_int = declspecs->explicit_int_p;
7655 explicit_char = declspecs->explicit_char_p;
7658 /* See the code below that used this. */
7660 decl_attr = DECL_ATTRIBUTES (typedef_decl);
7662 typedef_type = type;
7665 if (sfk != sfk_conversion)
7666 ctor_return_type = ctype;
7668 if (sfk != sfk_none)
7669 type = check_special_function_return_type (sfk, type,
7671 else if (type == NULL_TREE)
7677 /* We handle `main' specially here, because 'main () { }' is so
7678 common. With no options, it is allowed. With -Wreturn-type,
7679 it is a warning. It is only an error with -pedantic-errors. */
7680 is_main = (funcdef_flag
7681 && dname && MAIN_NAME_P (dname)
7682 && ctype == NULL_TREE
7683 && in_namespace == NULL_TREE
7684 && current_namespace == global_namespace);
7686 if (type_was_error_mark_node)
7687 /* We've already issued an error, don't complain more. */;
7688 else if (in_system_header || flag_ms_extensions)
7689 /* Allow it, sigh. */;
7690 else if (pedantic || ! is_main)
7691 pedwarn ("ISO C++ forbids declaration of %qs with no type", name);
7693 warning (OPT_Wreturn_type,
7694 "ISO C++ forbids declaration of %qs with no type", name);
7696 type = integer_type_node;
7701 /* Now process the modifiers that were specified
7702 and check for invalid combinations. */
7704 /* Long double is a special combination. */
7705 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
7708 type = build_qualified_type (long_double_type_node,
7709 cp_type_quals (type));
7712 /* Check all other uses of type modifiers. */
7714 if (unsigned_p || signed_p || long_p || short_p)
7718 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
7719 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
7720 else if (signed_p && unsigned_p)
7721 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
7722 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
7723 error ("%<long long%> invalid for %qs", name);
7724 else if (long_p && TREE_CODE (type) == REAL_TYPE)
7725 error ("%<long%> invalid for %qs", name);
7726 else if (short_p && TREE_CODE (type) == REAL_TYPE)
7727 error ("%<short%> invalid for %qs", name);
7728 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
7729 error ("%<long%> or %<short%> invalid for %qs", name);
7730 else if ((long_p || short_p) && explicit_char)
7731 error ("%<long%> or %<short%> specified with char for %qs", name);
7732 else if (long_p && short_p)
7733 error ("%<long%> and %<short%> specified together for %qs", name);
7737 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
7739 pedwarn ("long, short, signed or unsigned used invalidly for %qs",
7741 if (flag_pedantic_errors)
7746 /* Discard the type modifiers if they are invalid. */
7757 /* Decide whether an integer type is signed or not.
7758 Optionally treat bitfields as signed by default. */
7762 It is implementation-defined whether a plain (neither
7763 explicitly signed or unsigned) char, short, int, or long
7764 bit-field is signed or unsigned.
7766 Naturally, we extend this to long long as well. Note that
7767 this does not include wchar_t. */
7768 || (bitfield && !flag_signed_bitfields
7770 /* A typedef for plain `int' without `signed' can be
7771 controlled just like plain `int', but a typedef for
7772 `signed int' cannot be so controlled. */
7774 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
7775 && TREE_CODE (type) == INTEGER_TYPE
7776 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
7779 type = long_long_unsigned_type_node;
7781 type = long_unsigned_type_node;
7783 type = short_unsigned_type_node;
7784 else if (type == char_type_node)
7785 type = unsigned_char_type_node;
7786 else if (typedef_decl)
7787 type = unsigned_type_for (type);
7789 type = unsigned_type_node;
7791 else if (signed_p && type == char_type_node)
7792 type = signed_char_type_node;
7794 type = long_long_integer_type_node;
7796 type = long_integer_type_node;
7798 type = short_integer_type_node;
7800 if (declspecs->specs[(int)ds_complex])
7802 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
7803 error ("complex invalid for %qs", name);
7804 /* If we just have "complex", it is equivalent to
7805 "complex double", but if any modifiers at all are specified it is
7806 the complex form of TYPE. E.g, "complex short" is
7807 "complex short int". */
7809 else if (defaulted_int && ! longlong
7810 && ! (long_p || short_p || signed_p || unsigned_p))
7811 type = complex_double_type_node;
7812 else if (type == integer_type_node)
7813 type = complex_integer_type_node;
7814 else if (type == float_type_node)
7815 type = complex_float_type_node;
7816 else if (type == double_type_node)
7817 type = complex_double_type_node;
7818 else if (type == long_double_type_node)
7819 type = complex_long_double_type_node;
7821 type = build_complex_type (type);
7824 type_quals = TYPE_UNQUALIFIED;
7825 if (declspecs->specs[(int)ds_const])
7826 type_quals |= TYPE_QUAL_CONST;
7827 if (declspecs->specs[(int)ds_volatile])
7828 type_quals |= TYPE_QUAL_VOLATILE;
7829 if (declspecs->specs[(int)ds_restrict])
7830 type_quals |= TYPE_QUAL_RESTRICT;
7831 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
7832 error ("qualifiers are not allowed on declaration of %<operator %T%>",
7835 if (TREE_CODE (type) == FUNCTION_TYPE
7836 && type_quals != TYPE_UNQUALIFIED)
7838 /* This was an error in C++98 (cv-qualifiers cannot be added to
7839 a function type), but DR 295 makes the code well-formed by
7840 dropping the extra qualifiers. */
7843 tree bad_type = build_qualified_type (type, type_quals);
7844 pedwarn ("ignoring %qV qualifiers added to function type %qT",
7847 type_quals = TYPE_UNQUALIFIED;
7849 type_quals |= cp_type_quals (type);
7850 type = cp_build_qualified_type_real
7851 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
7852 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
7853 /* We might have ignored or rejected some of the qualifiers. */
7854 type_quals = cp_type_quals (type);
7857 inlinep = !! declspecs->specs[(int)ds_inline];
7858 virtualp = !! declspecs->specs[(int)ds_virtual];
7859 explicitp = !! declspecs->specs[(int)ds_explicit];
7861 storage_class = declspecs->storage_class;
7862 if (storage_class == sc_static)
7863 staticp = 1 + (decl_context == FIELD);
7865 if (virtualp && staticp == 2)
7867 error ("member %qD cannot be declared both virtual and static", dname);
7868 storage_class = sc_none;
7871 friendp = !! declspecs->specs[(int)ds_friend];
7873 if (dependent_name && !friendp)
7875 error ("%<%T::%D%> is not a valid declarator", ctype, dependent_name);
7876 return error_mark_node;
7879 /* Issue errors about use of storage classes for parameters. */
7880 if (decl_context == PARM)
7882 if (declspecs->specs[(int)ds_typedef])
7884 error ("typedef declaration invalid in parameter declaration");
7885 return error_mark_node;
7887 else if (storage_class == sc_static
7888 || storage_class == sc_extern
7890 error ("storage class specifiers invalid in parameter declarations");
7893 /* Give error if `virtual' is used outside of class declaration. */
7895 && (current_class_name == NULL_TREE || decl_context != FIELD))
7897 error ("virtual outside class declaration");
7901 /* Static anonymous unions are dealt with here. */
7902 if (staticp && decl_context == TYPENAME
7904 && ANON_AGGR_TYPE_P (declspecs->type))
7905 decl_context = FIELD;
7907 /* Warn about storage classes that are invalid for certain
7908 kinds of declarations (parameters, typenames, etc.). */
7911 && storage_class != sc_extern
7912 && storage_class != sc_static)
7913 || declspecs->specs[(int)ds_typedef]))
7915 error ("multiple storage classes in declaration of %qs", name);
7918 if (decl_context != NORMAL
7919 && ((storage_class != sc_none
7920 && storage_class != sc_mutable)
7923 if ((decl_context == PARM || decl_context == CATCHPARM)
7924 && (storage_class == sc_register
7925 || storage_class == sc_auto))
7927 else if (declspecs->specs[(int)ds_typedef])
7929 else if (decl_context == FIELD
7930 /* C++ allows static class elements. */
7931 && storage_class == sc_static)
7932 /* C++ also allows inlines and signed and unsigned elements,
7933 but in those cases we don't come in here. */
7937 if (decl_context == FIELD)
7938 error ("storage class specified for %qs", name);
7941 if (decl_context == PARM || decl_context == CATCHPARM)
7942 error ("storage class specified for parameter %qs", name);
7944 error ("storage class specified for typename");
7946 if (storage_class == sc_register
7947 || storage_class == sc_auto
7948 || storage_class == sc_extern
7950 storage_class = sc_none;
7953 else if (storage_class == sc_extern && initialized
7956 if (toplevel_bindings_p ())
7958 /* It's common practice (and completely valid) to have a const
7959 be initialized and declared extern. */
7960 if (!(type_quals & TYPE_QUAL_CONST))
7961 warning (0, "%qs initialized and declared %<extern%>", name);
7964 error ("%qs has both %<extern%> and initializer", name);
7966 else if (storage_class == sc_extern && funcdef_flag
7967 && ! toplevel_bindings_p ())
7968 error ("nested function %qs declared %<extern%>", name);
7969 else if (toplevel_bindings_p ())
7971 if (storage_class == sc_auto)
7972 error ("top-level declaration of %qs specifies %<auto%>", name);
7975 && storage_class != sc_extern
7976 && storage_class != sc_static)
7978 error ("function-scope %qs implicitly auto and declared %<__thread%>",
7983 if (storage_class && friendp)
7984 error ("storage class specifiers invalid in friend function declarations");
7987 unqualified_id = NULL_TREE;
7990 unqualified_id = id_declarator->u.id.unqualified_name;
7991 switch (TREE_CODE (unqualified_id))
7995 = constructor_name (TREE_OPERAND (unqualified_id, 0));
7998 case IDENTIFIER_NODE:
7999 case TEMPLATE_ID_EXPR:
8007 /* Determine the type of the entity declared by recurring on the
8009 for (; declarator; declarator = declarator->declarator)
8011 const cp_declarator *inner_declarator;
8014 if (type == error_mark_node)
8015 return error_mark_node;
8017 attrs = declarator->attributes;
8023 if (declarator == NULL || declarator->kind == cdk_id)
8024 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
8025 if (declarator->kind == cdk_function)
8026 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
8027 if (declarator->kind == cdk_array)
8028 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
8029 returned_attrs = decl_attributes (&type,
8030 chainon (returned_attrs, attrs),
8034 if (declarator->kind == cdk_id)
8037 inner_declarator = declarator->declarator;
8039 switch (declarator->kind)
8042 type = create_array_type_for_decl (dname, type,
8043 declarator->u.array.bounds);
8051 /* Declaring a function type.
8052 Make sure we have a valid type for the function to return. */
8054 if (type_quals != TYPE_UNQUALIFIED)
8056 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
8057 warning (OPT_Wignored_qualifiers,
8058 "type qualifiers ignored on function return type");
8059 /* We now know that the TYPE_QUALS don't apply to the
8060 decl, but to its return type. */
8061 type_quals = TYPE_UNQUALIFIED;
8062 set_no_warning = true;
8065 /* Warn about some types functions can't return. */
8067 if (TREE_CODE (type) == FUNCTION_TYPE)
8069 error ("%qs declared as function returning a function", name);
8070 type = integer_type_node;
8072 if (TREE_CODE (type) == ARRAY_TYPE)
8074 error ("%qs declared as function returning an array", name);
8075 type = integer_type_node;
8078 /* Pick up type qualifiers which should be applied to `this'. */
8079 memfn_quals = declarator->u.function.qualifiers;
8081 /* Pick up the exception specifications. */
8082 raises = declarator->u.function.exception_specification;
8084 /* Say it's a definition only for the CALL_EXPR
8085 closest to the identifier. */
8086 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
8088 if (ctype == NULL_TREE
8089 && decl_context == FIELD
8091 && (friendp == 0 || dname == current_class_name))
8092 ctype = current_class_type;
8094 if (ctype && (sfk == sfk_constructor
8095 || sfk == sfk_destructor))
8097 /* We are within a class's scope. If our declarator name
8098 is the same as the class name, and we are defining
8099 a function, then it is a constructor/destructor, and
8100 therefore returns a void type. */
8102 /* ISO C++ 12.4/2. A destructor may not be declared
8103 const or volatile. A destructor may not be
8106 ISO C++ 12.1. A constructor may not be declared
8107 const or volatile. A constructor may not be
8108 virtual. A constructor may not be static. */
8110 error ((flags == DTOR_FLAG)
8111 ? "destructor cannot be static member function"
8112 : "constructor cannot be static member function");
8115 error ((flags == DTOR_FLAG)
8116 ? "destructors may not be cv-qualified"
8117 : "constructors may not be cv-qualified");
8118 memfn_quals = TYPE_UNQUALIFIED;
8121 if (decl_context == FIELD
8122 && !member_function_or_else (ctype,
8125 return error_mark_node;
8127 if (flags != DTOR_FLAG)
8129 /* It's a constructor. */
8134 pedwarn ("constructors cannot be declared virtual");
8137 if (decl_context == FIELD
8138 && sfk != sfk_constructor)
8139 return error_mark_node;
8141 if (decl_context == FIELD)
8147 error ("can't initialize friend function %qs", name);
8150 /* Cannot be both friend and virtual. */
8151 error ("virtual functions cannot be friends");
8154 if (decl_context == NORMAL)
8155 error ("friend declaration not in class definition");
8156 if (current_function_decl && funcdef_flag)
8157 error ("can't define friend function %qs in a local "
8162 arg_types = grokparms (declarator->u.function.parameters,
8165 if (inner_declarator
8166 && inner_declarator->kind == cdk_id
8167 && inner_declarator->u.id.sfk == sfk_destructor
8168 && arg_types != void_list_node)
8170 error ("destructors may not have parameters");
8171 arg_types = void_list_node;
8175 type = build_function_type (type, arg_types);
8182 /* Filter out pointers-to-references and references-to-references.
8183 We can get these if a TYPE_DECL is used. */
8185 if (TREE_CODE (type) == REFERENCE_TYPE)
8187 if (declarator->kind != cdk_reference)
8189 error ("cannot declare pointer to %q#T", type);
8190 type = TREE_TYPE (type);
8193 /* In C++0x, we allow reference to reference declarations
8194 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
8195 and template type arguments [14.3.1/4 temp.arg.type]. The
8196 check for direct reference to reference declarations, which
8197 are still forbidden, occurs below. Reasoning behind the change
8198 can be found in DR106, DR540, and the rvalue reference
8200 else if (cxx_dialect == cxx98)
8202 error ("cannot declare reference to %q#T", type);
8203 type = TREE_TYPE (type);
8206 else if (VOID_TYPE_P (type))
8208 if (declarator->kind == cdk_reference)
8209 error ("cannot declare reference to %q#T", type);
8210 else if (declarator->kind == cdk_ptrmem)
8211 error ("cannot declare pointer to %q#T member", type);
8214 /* We now know that the TYPE_QUALS don't apply to the decl,
8215 but to the target of the pointer. */
8216 type_quals = TYPE_UNQUALIFIED;
8218 if (declarator->kind == cdk_ptrmem
8219 && (TREE_CODE (type) == FUNCTION_TYPE
8220 || (memfn_quals && TREE_CODE (type) == METHOD_TYPE)))
8222 memfn_quals |= cp_type_quals (type);
8223 type = build_memfn_type (type,
8224 declarator->u.pointer.class_type,
8226 memfn_quals = TYPE_UNQUALIFIED;
8229 if (declarator->kind == cdk_reference)
8231 /* In C++0x, the type we are creating a reference to might be
8232 a typedef which is itself a reference type. In that case,
8233 we follow the reference collapsing rules in
8234 [7.1.3/8 dcl.typedef] to create the final reference type:
8236 "If a typedef TD names a type that is a reference to a type
8237 T, an attempt to create the type 'lvalue reference to cv TD'
8238 creates the type 'lvalue reference to T,' while an attempt
8239 to create the type "rvalue reference to cv TD' creates the
8242 if (!VOID_TYPE_P (type))
8243 type = cp_build_reference_type
8244 ((TREE_CODE (type) == REFERENCE_TYPE
8245 ? TREE_TYPE (type) : type),
8246 (declarator->u.reference.rvalue_ref
8247 && (TREE_CODE(type) != REFERENCE_TYPE
8248 || TYPE_REF_IS_RVALUE (type))));
8250 /* In C++0x, we need this check for direct reference to
8251 reference declarations, which are forbidden by
8252 [8.3.2/5 dcl.ref]. Reference to reference declarations
8253 are only allowed indirectly through typedefs and template
8254 type arguments. Example:
8256 void foo(int & &); // invalid ref-to-ref decl
8258 typedef int & int_ref;
8259 void foo(int_ref &); // valid ref-to-ref decl
8261 if (inner_declarator && inner_declarator->kind == cdk_reference)
8262 error ("cannot declare reference to %q#T, which is not "
8263 "a typedef or a template type argument", type);
8265 else if (TREE_CODE (type) == METHOD_TYPE)
8266 type = build_ptrmemfunc_type (build_pointer_type (type));
8267 else if (declarator->kind == cdk_ptrmem)
8269 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
8271 if (declarator->u.pointer.class_type == error_mark_node)
8272 /* We will already have complained. */
8273 type = error_mark_node;
8275 type = build_ptrmem_type (declarator->u.pointer.class_type,
8279 type = build_pointer_type (type);
8281 /* Process a list of type modifier keywords (such as
8282 const or volatile) that were given inside the `*' or `&'. */
8284 if (declarator->u.pointer.qualifiers)
8287 = cp_build_qualified_type (type,
8288 declarator->u.pointer.qualifiers);
8289 type_quals = cp_type_quals (type);
8302 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
8303 && TREE_CODE (type) != FUNCTION_TYPE
8304 && TREE_CODE (type) != METHOD_TYPE)
8306 error ("template-id %qD used as a declarator",
8308 unqualified_id = dname;
8311 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
8312 qualified with a class-name, turn it into a METHOD_TYPE, unless
8313 we know that the function is static. We take advantage of this
8314 opportunity to do other processing that pertains to entities
8315 explicitly declared to be class members. Note that if DECLARATOR
8316 is non-NULL, we know it is a cdk_id declarator; otherwise, we
8317 would not have exited the loop above. */
8319 && declarator->u.id.qualifying_scope
8320 && TYPE_P (declarator->u.id.qualifying_scope))
8324 ctype = declarator->u.id.qualifying_scope;
8325 ctype = TYPE_MAIN_VARIANT (ctype);
8327 while (t != NULL_TREE && CLASS_TYPE_P (t))
8329 /* You're supposed to have one `template <...>' for every
8330 template class, but you don't need one for a full
8331 specialization. For example:
8333 template <class T> struct S{};
8334 template <> struct S<int> { void f(); };
8335 void S<int>::f () {}
8337 is correct; there shouldn't be a `template <>' for the
8338 definition of `S<int>::f'. */
8339 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
8340 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
8341 /* T is an explicit (not partial) specialization. All
8342 containing classes must therefore also be explicitly
8345 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
8346 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
8347 template_count += 1;
8349 t = TYPE_MAIN_DECL (t);
8350 t = DECL_CONTEXT (t);
8353 if (ctype == current_class_type)
8357 pedwarn ("member functions are implicitly friends of their class");
8361 pedwarn ("extra qualification %<%T::%> on member %qs",
8364 else if (/* If the qualifying type is already complete, then we
8365 can skip the following checks. */
8366 !COMPLETE_TYPE_P (ctype)
8367 && (/* If the function is being defined, then
8368 qualifying type must certainly be complete. */
8370 /* A friend declaration of "T::f" is OK, even if
8371 "T" is a template parameter. But, if this
8372 function is not a friend, the qualifying type
8374 || (!friendp && !CLASS_TYPE_P (ctype))
8375 /* For a declaration, the type need not be
8376 complete, if either it is dependent (since there
8377 is no meaningful definition of complete in that
8378 case) or the qualifying class is currently being
8380 || !(dependent_type_p (ctype)
8381 || currently_open_class (ctype)))
8382 /* Check that the qualifying type is complete. */
8383 && !complete_type_or_else (ctype, NULL_TREE))
8384 return error_mark_node;
8385 else if (TREE_CODE (type) == FUNCTION_TYPE)
8387 tree sname = declarator->u.id.unqualified_name;
8389 if (current_class_type
8390 && (!friendp || funcdef_flag))
8393 ? "cannot define member function %<%T::%s%> within %<%T%>"
8394 : "cannot declare member function %<%T::%s%> within %<%T%>",
8395 ctype, name, current_class_type);
8396 return error_mark_node;
8399 if (TREE_CODE (sname) == IDENTIFIER_NODE
8400 && NEW_DELETE_OPNAME_P (sname))
8401 /* Overloaded operator new and operator delete
8402 are always static functions. */
8405 type = build_memfn_type (type, ctype, memfn_quals);
8407 else if (declspecs->specs[(int)ds_typedef]
8408 && current_class_type)
8410 error ("cannot declare member %<%T::%s%> within %qT",
8411 ctype, name, current_class_type);
8412 return error_mark_node;
8416 /* Now TYPE has the actual type. */
8421 *attrlist = chainon (returned_attrs, *attrlist);
8423 attrlist = &returned_attrs;
8426 /* Handle parameter packs. */
8427 if (parameter_pack_p)
8429 if (decl_context == PARM)
8430 /* Turn the type into a pack expansion.*/
8431 type = make_pack_expansion (type);
8433 error ("non-parameter %qs cannot be a parameter pack", name);
8436 /* Did array size calculations overflow? */
8438 if (TREE_CODE (type) == ARRAY_TYPE
8439 && COMPLETE_TYPE_P (type)
8440 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
8441 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
8443 error ("size of array %qs is too large", name);
8444 /* If we proceed with the array type as it is, we'll eventually
8445 crash in tree_low_cst(). */
8446 type = error_mark_node;
8449 if ((decl_context == FIELD || decl_context == PARM)
8450 && !processing_template_decl
8451 && variably_modified_type_p (type, NULL_TREE))
8453 if (decl_context == FIELD)
8454 error ("data member may not have variably modified type %qT", type);
8456 error ("parameter may not have variably modified type %qT", type);
8457 type = error_mark_node;
8460 if (explicitp == 1 || (explicitp && friendp))
8462 /* [dcl.fct.spec] The explicit specifier shall only be used in
8463 declarations of constructors within a class definition. */
8464 error ("only declarations of constructors can be %<explicit%>");
8468 if (storage_class == sc_mutable)
8470 if (decl_context != FIELD || friendp)
8472 error ("non-member %qs cannot be declared %<mutable%>", name);
8473 storage_class = sc_none;
8475 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
8477 error ("non-object member %qs cannot be declared %<mutable%>", name);
8478 storage_class = sc_none;
8480 else if (TREE_CODE (type) == FUNCTION_TYPE
8481 || TREE_CODE (type) == METHOD_TYPE)
8483 error ("function %qs cannot be declared %<mutable%>", name);
8484 storage_class = sc_none;
8488 error ("static %qs cannot be declared %<mutable%>", name);
8489 storage_class = sc_none;
8491 else if (type_quals & TYPE_QUAL_CONST)
8493 error ("const %qs cannot be declared %<mutable%>", name);
8494 storage_class = sc_none;
8498 /* If this is declaring a typedef name, return a TYPE_DECL. */
8499 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
8503 /* Note that the grammar rejects storage classes
8504 in typenames, fields or parameters. */
8505 if (current_lang_name == lang_name_java)
8506 TYPE_FOR_JAVA (type) = 1;
8508 /* This declaration:
8510 typedef void f(int) const;
8512 declares a function type which is not a member of any
8513 particular class, but which is cv-qualified; for
8514 example "f S::*" declares a pointer to a const-qualified
8515 member function of S. We record the cv-qualification in the
8517 if (memfn_quals && TREE_CODE (type) == FUNCTION_TYPE)
8519 type = cp_build_qualified_type (type, memfn_quals);
8521 /* We have now dealt with these qualifiers. */
8522 memfn_quals = TYPE_UNQUALIFIED;
8525 if (decl_context == FIELD)
8526 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
8528 decl = build_decl (TYPE_DECL, unqualified_id, type);
8529 if (id_declarator && declarator->u.id.qualifying_scope)
8530 error ("%Jtypedef name may not be a nested-name-specifier", decl);
8532 if (decl_context != FIELD)
8534 if (!current_function_decl)
8535 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
8536 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
8537 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
8538 (current_function_decl)))
8539 /* The TYPE_DECL is "abstract" because there will be
8540 clones of this constructor/destructor, and there will
8541 be copies of this TYPE_DECL generated in those
8543 DECL_ABSTRACT (decl) = 1;
8545 else if (constructor_name_p (unqualified_id, current_class_type))
8546 pedwarn ("ISO C++ forbids nested type %qD with same name "
8547 "as enclosing class",
8550 /* If the user declares "typedef struct {...} foo" then the
8551 struct will have an anonymous name. Fill that name in now.
8552 Nothing can refer to it, so nothing needs know about the name
8554 if (type != error_mark_node
8557 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
8558 && TYPE_ANONYMOUS_P (type)
8559 /* Don't do this if there are attributes. */
8560 && (!attrlist || !*attrlist)
8561 && cp_type_quals (type) == TYPE_UNQUALIFIED)
8563 tree oldname = TYPE_NAME (type);
8566 /* Replace the anonymous name with the real name everywhere. */
8567 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
8568 if (TYPE_NAME (t) == oldname)
8569 TYPE_NAME (t) = decl;
8571 if (TYPE_LANG_SPECIFIC (type))
8572 TYPE_WAS_ANONYMOUS (type) = 1;
8574 /* If this is a typedef within a template class, the nested
8575 type is a (non-primary) template. The name for the
8576 template needs updating as well. */
8577 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
8578 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
8579 = TYPE_IDENTIFIER (type);
8581 /* FIXME remangle member functions; member functions of a
8582 type with external linkage have external linkage. */
8586 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
8587 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
8589 bad_specifiers (decl, "type", virtualp,
8590 memfn_quals != TYPE_UNQUALIFIED,
8591 inlinep, friendp, raises != NULL_TREE);
8596 /* Detect the case of an array type of unspecified size
8597 which came, as such, direct from a typedef name.
8598 We must copy the type, so that the array's domain can be
8599 individually set by the object's initializer. */
8601 if (type && typedef_type
8602 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
8603 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
8604 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
8606 /* Detect where we're using a typedef of function type to declare a
8607 function. PARMS will not be set, so we must create it now. */
8609 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
8611 tree decls = NULL_TREE;
8614 for (args = TYPE_ARG_TYPES (type); args; args = TREE_CHAIN (args))
8616 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
8618 TREE_CHAIN (decl) = decls;
8622 parms = nreverse (decls);
8624 if (decl_context != TYPENAME)
8626 /* A cv-qualifier-seq shall only be part of the function type
8627 for a non-static member function. [8.3.5/4 dcl.fct] */
8628 if (cp_type_quals (type) != TYPE_UNQUALIFIED
8629 && (current_class_type == NULL_TREE || staticp) )
8632 ? G_("qualified function types cannot be used to "
8633 "declare static member functions")
8634 : G_("qualified function types cannot be used to "
8635 "declare free functions"));
8636 type = TYPE_MAIN_VARIANT (type);
8639 /* The qualifiers on the function type become the qualifiers on
8640 the non-static member function. */
8641 memfn_quals |= cp_type_quals (type);
8645 /* If this is a type name (such as, in a cast or sizeof),
8646 compute the type and return it now. */
8648 if (decl_context == TYPENAME)
8650 /* Note that the grammar rejects storage classes
8651 in typenames, fields or parameters. */
8652 if (type_quals != TYPE_UNQUALIFIED)
8653 type_quals = TYPE_UNQUALIFIED;
8655 /* Special case: "friend class foo" looks like a TYPENAME context. */
8658 if (type_quals != TYPE_UNQUALIFIED)
8660 error ("type qualifiers specified for friend class declaration");
8661 type_quals = TYPE_UNQUALIFIED;
8665 error ("%<inline%> specified for friend class declaration");
8671 /* Don't allow friend declaration without a class-key. */
8672 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
8673 pedwarn ("template parameters cannot be friends");
8674 else if (TREE_CODE (type) == TYPENAME_TYPE)
8675 pedwarn ("friend declaration requires class-key, "
8676 "i.e. %<friend class %T::%D%>",
8677 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
8679 pedwarn ("friend declaration requires class-key, "
8680 "i.e. %<friend %#T%>",
8684 /* Only try to do this stuff if we didn't already give up. */
8685 if (type != integer_type_node)
8687 /* A friendly class? */
8688 if (current_class_type)
8689 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
8692 error ("trying to make class %qT a friend of global scope",
8695 type = void_type_node;
8698 else if (memfn_quals)
8700 if (ctype == NULL_TREE)
8702 if (TREE_CODE (type) != METHOD_TYPE)
8703 error ("invalid qualifiers on non-member function type");
8705 ctype = TYPE_METHOD_BASETYPE (type);
8708 type = build_memfn_type (type, ctype, memfn_quals);
8713 else if (unqualified_id == NULL_TREE && decl_context != PARM
8714 && decl_context != CATCHPARM
8715 && TREE_CODE (type) != UNION_TYPE
8718 error ("abstract declarator %qT used as declaration", type);
8719 return error_mark_node;
8722 /* Only functions may be declared using an operator-function-id. */
8724 && IDENTIFIER_OPNAME_P (unqualified_id)
8725 && TREE_CODE (type) != FUNCTION_TYPE
8726 && TREE_CODE (type) != METHOD_TYPE)
8728 error ("declaration of %qD as non-function", unqualified_id);
8729 return error_mark_node;
8732 /* We don't check parameter types here because we can emit a better
8733 error message later. */
8734 if (decl_context != PARM)
8736 type = check_var_type (unqualified_id, type);
8737 if (type == error_mark_node)
8738 return error_mark_node;
8741 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
8742 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
8744 if (decl_context == PARM || decl_context == CATCHPARM)
8746 if (ctype || in_namespace)
8747 error ("cannot use %<::%> in parameter declaration");
8749 /* A parameter declared as an array of T is really a pointer to T.
8750 One declared as a function is really a pointer to a function.
8751 One declared as a member is really a pointer to member. */
8753 if (TREE_CODE (type) == ARRAY_TYPE)
8755 /* Transfer const-ness of array into that of type pointed to. */
8756 type = build_pointer_type (TREE_TYPE (type));
8757 type_quals = TYPE_UNQUALIFIED;
8759 else if (TREE_CODE (type) == FUNCTION_TYPE)
8760 type = build_pointer_type (type);
8766 if (decl_context == PARM)
8768 decl = cp_build_parm_decl (unqualified_id, type);
8770 bad_specifiers (decl, "parameter", virtualp,
8771 memfn_quals != TYPE_UNQUALIFIED,
8772 inlinep, friendp, raises != NULL_TREE);
8774 else if (decl_context == FIELD)
8776 /* The C99 flexible array extension. */
8777 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
8778 && TYPE_DOMAIN (type) == NULL_TREE)
8780 tree itype = compute_array_index_type (dname, integer_zero_node);
8781 type = build_cplus_array_type (TREE_TYPE (type), itype);
8784 if (type == error_mark_node)
8786 /* Happens when declaring arrays of sizes which
8787 are error_mark_node, for example. */
8790 else if (in_namespace && !friendp)
8792 /* Something like struct S { int N::j; }; */
8793 error ("invalid use of %<::%>");
8794 return error_mark_node;
8796 else if (TREE_CODE (type) == FUNCTION_TYPE)
8799 tree function_context;
8803 if (ctype == NULL_TREE)
8804 ctype = current_class_type;
8806 if (ctype == NULL_TREE)
8808 error ("can't make %qD into a method -- not in a class",
8810 return error_mark_node;
8813 /* ``A union may [ ... ] not [ have ] virtual functions.''
8815 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
8817 error ("function %qD declared virtual inside a union",
8819 return error_mark_node;
8822 if (NEW_DELETE_OPNAME_P (unqualified_id))
8826 error ("%qD cannot be declared virtual, since it "
8832 else if (staticp < 2)
8833 type = build_memfn_type (type, ctype, memfn_quals);
8836 /* Check that the name used for a destructor makes sense. */
8837 if (sfk == sfk_destructor)
8841 gcc_assert (friendp);
8842 error ("expected qualified name in friend declaration "
8843 "for destructor %qD",
8844 id_declarator->u.id.unqualified_name);
8845 return error_mark_node;
8848 if (!same_type_p (TREE_OPERAND
8849 (id_declarator->u.id.unqualified_name, 0),
8852 error ("declaration of %qD as member of %qT",
8853 id_declarator->u.id.unqualified_name, ctype);
8854 return error_mark_node;
8857 else if (sfk == sfk_constructor && friendp)
8859 error ("expected qualified name in friend declaration "
8860 "for constructor %qD",
8861 id_declarator->u.id.unqualified_name);
8862 return error_mark_node;
8865 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
8866 function_context = (ctype != NULL_TREE) ?
8867 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
8868 publicp = (! friendp || ! staticp)
8869 && function_context == NULL_TREE;
8870 decl = grokfndecl (ctype, type,
8871 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
8872 ? unqualified_id : dname,
8875 virtualp, flags, memfn_quals, raises,
8876 friendp ? -1 : 0, friendp, publicp, inlinep,
8878 funcdef_flag, template_count, in_namespace, attrlist);
8879 if (decl == NULL_TREE)
8880 return error_mark_node;
8882 /* This clobbers the attrs stored in `decl' from `attrlist'. */
8883 /* The decl and setting of decl_attr is also turned off. */
8884 decl = build_decl_attribute_variant (decl, decl_attr);
8887 /* [class.conv.ctor]
8889 A constructor declared without the function-specifier
8890 explicit that can be called with a single parameter
8891 specifies a conversion from the type of its first
8892 parameter to the type of its class. Such a constructor
8893 is called a converting constructor. */
8895 DECL_NONCONVERTING_P (decl) = 1;
8896 else if (DECL_CONSTRUCTOR_P (decl))
8898 /* The constructor can be called with exactly one
8899 parameter if there is at least one parameter, and
8900 any subsequent parameters have default arguments.
8901 Ignore any compiler-added parms. */
8902 tree arg_types = FUNCTION_FIRST_USER_PARMTYPE (decl);
8904 if (arg_types == void_list_node
8906 && TREE_CHAIN (arg_types)
8907 && TREE_CHAIN (arg_types) != void_list_node
8908 && !TREE_PURPOSE (TREE_CHAIN (arg_types))))
8909 DECL_NONCONVERTING_P (decl) = 1;
8912 else if (TREE_CODE (type) == METHOD_TYPE)
8914 /* We only get here for friend declarations of
8915 members of other classes. */
8916 /* All method decls are public, so tell grokfndecl to set
8917 TREE_PUBLIC, also. */
8918 decl = grokfndecl (ctype, type,
8919 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
8920 ? unqualified_id : dname,
8923 virtualp, flags, memfn_quals, raises,
8924 friendp ? -1 : 0, friendp, 1, 0, sfk,
8925 funcdef_flag, template_count, in_namespace,
8927 if (decl == NULL_TREE)
8928 return error_mark_node;
8930 else if (!staticp && !dependent_type_p (type)
8931 && !COMPLETE_TYPE_P (complete_type (type))
8932 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
8935 error ("field %qD has incomplete type", unqualified_id);
8937 error ("name %qT has incomplete type", type);
8939 /* If we're instantiating a template, tell them which
8940 instantiation made the field's type be incomplete. */
8941 if (current_class_type
8942 && TYPE_NAME (current_class_type)
8943 && IDENTIFIER_TEMPLATE (TYPE_IDENTIFIER (current_class_type))
8945 && declspecs->type == type)
8946 error (" in instantiation of template %qT",
8947 current_class_type);
8949 return error_mark_node;
8955 error ("%qE is neither function nor member function; "
8956 "cannot be declared friend", unqualified_id);
8964 /* Friends are treated specially. */
8965 if (ctype == current_class_type)
8966 ; /* We already issued a pedwarn. */
8967 else if (decl && DECL_NAME (decl))
8969 if (template_class_depth (current_class_type) == 0)
8971 decl = check_explicit_specialization
8972 (unqualified_id, decl, template_count,
8973 2 * funcdef_flag + 4);
8974 if (decl == error_mark_node)
8975 return error_mark_node;
8978 decl = do_friend (ctype, unqualified_id, decl,
8984 return error_mark_node;
8987 /* Structure field. It may not be a function, except for C++. */
8989 if (decl == NULL_TREE)
8995 /* An attempt is being made to initialize a non-static
8996 member. But, from [class.mem]:
8998 4 A member-declarator can contain a
8999 constant-initializer only if it declares a static
9000 member (_class.static_) of integral or enumeration
9001 type, see _class.static.data_.
9003 This used to be relatively common practice, but
9004 the rest of the compiler does not correctly
9005 handle the initialization unless the member is
9006 static so we make it static below. */
9007 pedwarn ("ISO C++ forbids initialization of member %qD",
9009 pedwarn ("making %qD static", unqualified_id);
9013 if (uses_template_parms (type))
9014 /* We'll check at instantiation time. */
9016 else if (check_static_variable_definition (unqualified_id,
9018 /* If we just return the declaration, crashes
9019 will sometimes occur. We therefore return
9020 void_type_node, as if this was a friend
9021 declaration, to cause callers to completely
9022 ignore this declaration. */
9023 return error_mark_node;
9028 /* C++ allows static class members. All other work
9029 for this is done by grokfield. */
9030 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
9031 set_linkage_for_static_data_member (decl);
9032 /* Even if there is an in-class initialization, DECL
9033 is considered undefined until an out-of-class
9034 definition is provided. */
9035 DECL_EXTERNAL (decl) = 1;
9038 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
9042 decl = build_decl (FIELD_DECL, unqualified_id, type);
9043 DECL_NONADDRESSABLE_P (decl) = bitfield;
9044 if (bitfield && !unqualified_id)
9045 TREE_NO_WARNING (decl) = 1;
9047 if (storage_class == sc_mutable)
9049 DECL_MUTABLE_P (decl) = 1;
9050 storage_class = sc_none;
9054 bad_specifiers (decl, "field", virtualp,
9055 memfn_quals != TYPE_UNQUALIFIED,
9056 inlinep, friendp, raises != NULL_TREE);
9059 else if (TREE_CODE (type) == FUNCTION_TYPE
9060 || TREE_CODE (type) == METHOD_TYPE)
9065 if (!unqualified_id)
9066 return error_mark_node;
9068 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
9069 original_name = dname;
9071 original_name = unqualified_id;
9073 if (storage_class == sc_auto)
9074 error ("storage class %<auto%> invalid for function %qs", name);
9075 else if (storage_class == sc_register)
9076 error ("storage class %<register%> invalid for function %qs", name);
9078 error ("storage class %<__thread%> invalid for function %qs", name);
9080 /* Function declaration not at top level.
9081 Storage classes other than `extern' are not allowed
9082 and `extern' makes no difference. */
9083 if (! toplevel_bindings_p ()
9084 && (storage_class == sc_static
9085 || declspecs->specs[(int)ds_inline])
9088 if (storage_class == sc_static)
9089 pedwarn ("%<static%> specified invalid for function %qs "
9090 "declared out of global scope", name);
9092 pedwarn ("%<inline%> specifier invalid for function %qs "
9093 "declared out of global scope", name);
9096 if (ctype == NULL_TREE)
9100 error ("virtual non-class function %qs", name);
9104 else if (TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
9105 && !NEW_DELETE_OPNAME_P (original_name))
9106 type = build_method_type_directly (ctype,
9108 TYPE_ARG_TYPES (type));
9110 /* Record presence of `static'. */
9111 publicp = (ctype != NULL_TREE
9112 || storage_class == sc_extern
9113 || storage_class != sc_static);
9115 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
9116 virtualp, flags, memfn_quals, raises,
9118 publicp, inlinep, sfk, funcdef_flag,
9119 template_count, in_namespace, attrlist);
9120 if (decl == NULL_TREE)
9121 return error_mark_node;
9125 int invalid_static = 0;
9127 /* Don't allow a static member function in a class, and forbid
9128 declaring main to be static. */
9129 if (TREE_CODE (type) == METHOD_TYPE)
9131 pedwarn ("cannot declare member function %qD to have "
9132 "static linkage", decl);
9135 else if (current_function_decl)
9137 /* FIXME need arm citation */
9138 error ("cannot declare static function inside another function");
9145 storage_class = sc_none;
9151 /* It's a variable. */
9153 /* An uninitialized decl with `extern' is a reference. */
9154 decl = grokvardecl (type, unqualified_id,
9157 (type_quals & TYPE_QUAL_CONST) != 0,
9158 ctype ? ctype : in_namespace);
9159 bad_specifiers (decl, "variable", virtualp,
9160 memfn_quals != TYPE_UNQUALIFIED,
9161 inlinep, friendp, raises != NULL_TREE);
9165 DECL_CONTEXT (decl) = ctype;
9168 pedwarn ("%<static%> may not be used when defining "
9169 "(as opposed to declaring) a static data member");
9171 storage_class = sc_none;
9173 if (storage_class == sc_register && TREE_STATIC (decl))
9175 error ("static member %qD declared %<register%>", decl);
9176 storage_class = sc_none;
9178 if (storage_class == sc_extern && pedantic)
9180 pedwarn ("cannot explicitly declare member %q#D to have "
9183 storage_class = sc_none;
9188 /* Record `register' declaration for warnings on &
9189 and in case doing stupid register allocation. */
9191 if (storage_class == sc_register)
9192 DECL_REGISTER (decl) = 1;
9193 else if (storage_class == sc_extern)
9194 DECL_THIS_EXTERN (decl) = 1;
9195 else if (storage_class == sc_static)
9196 DECL_THIS_STATIC (decl) = 1;
9198 /* Record constancy and volatility on the DECL itself . There's
9199 no need to do this when processing a template; we'll do this
9200 for the instantiated declaration based on the type of DECL. */
9201 if (!processing_template_decl)
9202 cp_apply_type_quals_to_decl (type_quals, decl);
9205 TREE_NO_WARNING (decl) = 1;
9211 /* Subroutine of start_function. Ensure that each of the parameter
9212 types (as listed in PARMS) is complete, as is required for a
9213 function definition. */
9216 require_complete_types_for_parms (tree parms)
9218 for (; parms; parms = TREE_CHAIN (parms))
9220 if (dependent_type_p (TREE_TYPE (parms)))
9222 if (!VOID_TYPE_P (TREE_TYPE (parms))
9223 && complete_type_or_else (TREE_TYPE (parms), parms))
9225 relayout_decl (parms);
9226 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
9229 /* grokparms or complete_type_or_else will have already issued
9231 TREE_TYPE (parms) = error_mark_node;
9235 /* Returns nonzero if T is a local variable. */
9238 local_variable_p (const_tree t)
9240 if ((TREE_CODE (t) == VAR_DECL
9241 /* A VAR_DECL with a context that is a _TYPE is a static data
9243 && !TYPE_P (CP_DECL_CONTEXT (t))
9244 /* Any other non-local variable must be at namespace scope. */
9245 && !DECL_NAMESPACE_SCOPE_P (t))
9246 || (TREE_CODE (t) == PARM_DECL))
9252 /* Like local_variable_p, but suitable for use as a tree-walking
9256 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
9257 void *data ATTRIBUTE_UNUSED)
9259 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
9261 else if (TYPE_P (*tp))
9268 /* Check that ARG, which is a default-argument expression for a
9269 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
9270 something goes wrong. DECL may also be a _TYPE node, rather than a
9271 DECL, if there is no DECL available. */
9274 check_default_argument (tree decl, tree arg)
9279 if (TREE_CODE (arg) == DEFAULT_ARG)
9280 /* We get a DEFAULT_ARG when looking at an in-class declaration
9281 with a default argument. Ignore the argument for now; we'll
9282 deal with it after the class is complete. */
9291 decl_type = TREE_TYPE (decl);
9293 if (arg == error_mark_node
9294 || decl == error_mark_node
9295 || TREE_TYPE (arg) == error_mark_node
9296 || decl_type == error_mark_node)
9297 /* Something already went wrong. There's no need to check
9299 return error_mark_node;
9301 /* [dcl.fct.default]
9303 A default argument expression is implicitly converted to the
9305 if (!TREE_TYPE (arg)
9306 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
9309 error ("default argument for %q#D has type %qT",
9310 decl, TREE_TYPE (arg));
9312 error ("default argument for parameter of type %qT has type %qT",
9313 decl_type, TREE_TYPE (arg));
9315 return error_mark_node;
9318 /* [dcl.fct.default]
9320 Local variables shall not be used in default argument
9323 The keyword `this' shall not be used in a default argument of a
9325 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
9328 error ("default argument %qE uses local variable %qD", arg, var);
9329 return error_mark_node;
9336 /* Decode the list of parameter types for a function type.
9337 Given the list of things declared inside the parens,
9338 return a list of types.
9340 If this parameter does not end with an ellipsis, we append
9343 *PARMS is set to the chain of PARM_DECLs created. */
9346 grokparms (cp_parameter_declarator *first_parm, tree *parms)
9348 tree result = NULL_TREE;
9349 tree decls = NULL_TREE;
9350 int ellipsis = !first_parm || first_parm->ellipsis_p;
9351 cp_parameter_declarator *parm;
9353 struct pointer_set_t *unique_decls = pointer_set_create ();
9355 for (parm = first_parm; parm != NULL; parm = parm->next)
9357 tree type = NULL_TREE;
9358 tree init = parm->default_argument;
9362 if (parm == no_parameters)
9365 attrs = parm->decl_specifiers.attributes;
9366 parm->decl_specifiers.attributes = NULL_TREE;
9367 decl = grokdeclarator (parm->declarator, &parm->decl_specifiers,
9368 PARM, init != NULL_TREE, &attrs);
9369 if (! decl || TREE_TYPE (decl) == error_mark_node)
9373 cplus_decl_attributes (&decl, attrs, 0);
9375 type = TREE_TYPE (decl);
9376 if (VOID_TYPE_P (type))
9378 if (same_type_p (type, void_type_node)
9379 && DECL_SELF_REFERENCE_P (type)
9380 && !DECL_NAME (decl) && !result && !parm->next && !ellipsis)
9381 /* this is a parmlist of `(void)', which is ok. */
9383 cxx_incomplete_type_error (decl, type);
9384 /* It's not a good idea to actually create parameters of
9385 type `void'; other parts of the compiler assume that a
9386 void type terminates the parameter list. */
9387 type = error_mark_node;
9388 TREE_TYPE (decl) = error_mark_node;
9391 if (type != error_mark_node
9392 && TYPE_FOR_JAVA (type)
9393 && IS_AGGR_TYPE (type))
9395 error ("parameter %qD has Java class type", decl);
9396 type = error_mark_node;
9397 TREE_TYPE (decl) = error_mark_node;
9401 if (type != error_mark_node)
9403 /* Top-level qualifiers on the parameters are
9404 ignored for function types. */
9405 type = cp_build_qualified_type (type, 0);
9406 if (TREE_CODE (type) == METHOD_TYPE)
9408 error ("parameter %qD invalidly declared method type", decl);
9409 type = build_pointer_type (type);
9410 TREE_TYPE (decl) = type;
9412 else if (abstract_virtuals_error (decl, type))
9413 any_error = 1; /* Seems like a good idea. */
9414 else if (POINTER_TYPE_P (type))
9416 /* [dcl.fct]/6, parameter types cannot contain pointers
9417 (references) to arrays of unknown bound. */
9418 tree t = TREE_TYPE (type);
9419 int ptr = TYPE_PTR_P (type);
9425 else if (TREE_CODE (t) != ARRAY_TYPE)
9427 else if (!TYPE_DOMAIN (t))
9431 if (TREE_CODE (t) == ARRAY_TYPE)
9432 error ("parameter %qD includes %s to array of unknown "
9434 decl, ptr ? "pointer" : "reference", t);
9439 else if (init && !processing_template_decl)
9440 init = check_default_argument (decl, init);
9443 if (TREE_CODE (decl) == PARM_DECL
9444 && FUNCTION_PARAMETER_PACK_P (decl)
9446 error ("parameter packs must be at the end of the parameter list");
9448 if (DECL_NAME (decl))
9450 if (pointer_set_contains (unique_decls, DECL_NAME (decl)))
9451 error ("multiple parameters named %qE", DECL_NAME (decl));
9453 pointer_set_insert (unique_decls, DECL_NAME (decl));
9456 TREE_CHAIN (decl) = decls;
9458 result = tree_cons (init, type, result);
9460 decls = nreverse (decls);
9461 result = nreverse (result);
9463 result = chainon (result, void_list_node);
9466 pointer_set_destroy (unique_decls);
9471 /* D is a constructor or overloaded `operator='.
9473 Let T be the class in which D is declared. Then, this function
9476 -1 if D's is an ill-formed constructor or copy assignment operator
9477 whose first parameter is of type `T'.
9478 0 if D is not a copy constructor or copy assignment
9480 1 if D is a copy constructor or copy assignment operator whose
9481 first parameter is a reference to const qualified T.
9482 2 if D is a copy constructor or copy assignment operator whose
9483 first parameter is a reference to non-const qualified T.
9485 This function can be used as a predicate. Positive values indicate
9486 a copy constructor and nonzero values indicate a copy assignment
9490 copy_fn_p (const_tree d)
9496 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
9498 if (TREE_CODE (d) == TEMPLATE_DECL
9499 || (DECL_TEMPLATE_INFO (d)
9500 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
9501 /* Instantiations of template member functions are never copy
9502 functions. Note that member functions of templated classes are
9503 represented as template functions internally, and we must
9504 accept those as copy functions. */
9507 args = FUNCTION_FIRST_USER_PARMTYPE (d);
9511 arg_type = TREE_VALUE (args);
9512 if (arg_type == error_mark_node)
9515 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
9517 /* Pass by value copy assignment operator. */
9520 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
9521 && !TYPE_REF_IS_RVALUE (arg_type)
9522 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
9524 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
9530 args = TREE_CHAIN (args);
9532 if (args && args != void_list_node && !TREE_PURPOSE (args))
9533 /* There are more non-optional args. */
9539 /* D is a constructor or overloaded `operator='.
9541 Let T be the class in which D is declared. Then, this function
9542 returns true when D is a move constructor or move assignment
9543 operator, false otherwise. */
9546 move_fn_p (const_tree d)
9550 bool result = false;
9552 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
9554 if (cxx_dialect == cxx98)
9555 /* There are no move constructors if we are in C++98 mode. */
9558 if (TREE_CODE (d) == TEMPLATE_DECL
9559 || (DECL_TEMPLATE_INFO (d)
9560 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
9561 /* Instantiations of template member functions are never copy
9562 functions. Note that member functions of templated classes are
9563 represented as template functions internally, and we must
9564 accept those as copy functions. */
9567 args = FUNCTION_FIRST_USER_PARMTYPE (d);
9571 arg_type = TREE_VALUE (args);
9572 if (arg_type == error_mark_node)
9575 if (TREE_CODE (arg_type) == REFERENCE_TYPE
9576 && TYPE_REF_IS_RVALUE (arg_type)
9577 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
9581 args = TREE_CHAIN (args);
9583 if (args && args != void_list_node && !TREE_PURPOSE (args))
9584 /* There are more non-optional args. */
9590 /* Remember any special properties of member function DECL. */
9593 grok_special_member_properties (tree decl)
9597 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
9600 class_type = DECL_CONTEXT (decl);
9601 if (DECL_CONSTRUCTOR_P (decl))
9603 int ctor = copy_fn_p (decl);
9605 if (!DECL_ARTIFICIAL (decl))
9606 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
9612 A non-template constructor for class X is a copy
9613 constructor if its first parameter is of type X&, const
9614 X&, volatile X& or const volatile X&, and either there
9615 are no other parameters or else all other parameters have
9616 default arguments. */
9617 TYPE_HAS_INIT_REF (class_type) = 1;
9619 TYPE_HAS_CONST_INIT_REF (class_type) = 1;
9621 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
9622 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
9624 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
9628 A non-template assignment operator for class X is a copy
9629 assignment operator if its parameter is of type X, X&, const
9630 X&, volatile X& or const volatile X&. */
9632 int assop = copy_fn_p (decl);
9636 TYPE_HAS_ASSIGN_REF (class_type) = 1;
9638 TYPE_HAS_CONST_ASSIGN_REF (class_type) = 1;
9643 /* Check a constructor DECL has the correct form. Complains
9644 if the class has a constructor of the form X(X). */
9647 grok_ctor_properties (const_tree ctype, const_tree decl)
9649 int ctor_parm = copy_fn_p (decl);
9655 A declaration of a constructor for a class X is ill-formed if
9656 its first parameter is of type (optionally cv-qualified) X
9657 and either there are no other parameters or else all other
9658 parameters have default arguments.
9660 We *don't* complain about member template instantiations that
9661 have this form, though; they can occur as we try to decide
9662 what constructor to use during overload resolution. Since
9663 overload resolution will never prefer such a constructor to
9664 the non-template copy constructor (which is either explicitly
9665 or implicitly defined), there's no need to worry about their
9666 existence. Theoretically, they should never even be
9667 instantiated, but that's hard to forestall. */
9668 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
9676 /* An operator with this code is unary, but can also be binary. */
9679 ambi_op_p (enum tree_code code)
9681 return (code == INDIRECT_REF
9682 || code == ADDR_EXPR
9683 || code == UNARY_PLUS_EXPR
9684 || code == NEGATE_EXPR
9685 || code == PREINCREMENT_EXPR
9686 || code == PREDECREMENT_EXPR);
9689 /* An operator with this name can only be unary. */
9692 unary_op_p (enum tree_code code)
9694 return (code == TRUTH_NOT_EXPR
9695 || code == BIT_NOT_EXPR
9696 || code == COMPONENT_REF
9697 || code == TYPE_EXPR);
9700 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
9701 errors are issued for invalid declarations. */
9704 grok_op_properties (tree decl, bool complain)
9706 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
9708 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
9709 tree name = DECL_NAME (decl);
9710 enum tree_code operator_code;
9715 /* Count the number of arguments and check for ellipsis. */
9716 for (argtype = argtypes, arity = 0;
9717 argtype && argtype != void_list_node;
9718 argtype = TREE_CHAIN (argtype))
9720 ellipsis_p = !argtype;
9722 class_type = DECL_CONTEXT (decl);
9723 if (class_type && !CLASS_TYPE_P (class_type))
9724 class_type = NULL_TREE;
9726 if (DECL_CONV_FN_P (decl))
9727 operator_code = TYPE_EXPR;
9731 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
9732 if (ansi_opname (CODE) == name) \
9734 operator_code = (CODE); \
9737 else if (ansi_assopname (CODE) == name) \
9739 operator_code = (CODE); \
9740 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
9744 #include "operators.def"
9750 gcc_assert (operator_code != LAST_CPLUS_TREE_CODE);
9751 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
9754 switch (operator_code)
9757 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
9761 TYPE_GETS_DELETE (class_type) |= 1;
9765 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
9768 case VEC_DELETE_EXPR:
9769 TYPE_GETS_DELETE (class_type) |= 2;
9776 /* [basic.std.dynamic.allocation]/1:
9778 A program is ill-formed if an allocation function is declared
9779 in a namespace scope other than global scope or declared static
9782 The same also holds true for deallocation functions. */
9783 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
9784 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
9786 if (DECL_NAMESPACE_SCOPE_P (decl))
9788 if (CP_DECL_CONTEXT (decl) != global_namespace)
9790 error ("%qD may not be declared within a namespace", decl);
9793 else if (!TREE_PUBLIC (decl))
9795 error ("%qD may not be declared as static", decl);
9801 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
9803 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
9804 DECL_IS_OPERATOR_NEW (decl) = 1;
9806 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
9807 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
9810 /* An operator function must either be a non-static member function
9811 or have at least one parameter of a class, a reference to a class,
9812 an enumeration, or a reference to an enumeration. 13.4.0.6 */
9813 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
9815 if (operator_code == TYPE_EXPR
9816 || operator_code == CALL_EXPR
9817 || operator_code == COMPONENT_REF
9818 || operator_code == ARRAY_REF
9819 || operator_code == NOP_EXPR)
9821 error ("%qD must be a nonstatic member function", decl);
9828 if (DECL_STATIC_FUNCTION_P (decl))
9830 error ("%qD must be either a non-static member "
9831 "function or a non-member function", decl);
9835 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
9837 tree arg = non_reference (TREE_VALUE (p));
9838 if (arg == error_mark_node)
9841 /* IS_AGGR_TYPE, rather than CLASS_TYPE_P, is used
9842 because these checks are performed even on
9843 template functions. */
9844 if (IS_AGGR_TYPE (arg) || TREE_CODE (arg) == ENUMERAL_TYPE)
9848 if (!p || p == void_list_node)
9851 error ("%qD must have an argument of class or "
9852 "enumerated type", decl);
9858 /* There are no restrictions on the arguments to an overloaded
9860 if (operator_code == CALL_EXPR)
9863 /* Warn about conversion operators that will never be used. */
9864 if (IDENTIFIER_TYPENAME_P (name)
9865 && ! DECL_TEMPLATE_INFO (decl)
9867 /* Warn only declaring the function; there is no need to
9868 warn again about out-of-class definitions. */
9869 && class_type == current_class_type)
9871 tree t = TREE_TYPE (name);
9872 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
9873 const char *what = 0;
9876 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
9878 if (TREE_CODE (t) == VOID_TYPE)
9880 else if (class_type)
9882 if (t == class_type)
9883 what = "the same type";
9884 /* Don't force t to be complete here. */
9885 else if (IS_AGGR_TYPE (t)
9886 && COMPLETE_TYPE_P (t)
9887 && DERIVED_FROM_P (t, class_type))
9888 what = "a base class";
9892 warning (OPT_Wconversion, "conversion to %s%s will never use a type "
9893 "conversion operator",
9894 ref ? "a reference to " : "", what);
9897 if (operator_code == COND_EXPR)
9900 error ("ISO C++ prohibits overloading operator ?:");
9903 else if (ellipsis_p)
9905 error ("%qD must not have variable number of arguments", decl);
9908 else if (ambi_op_p (operator_code))
9911 /* We pick the one-argument operator codes by default, so
9912 we don't have to change anything. */
9914 else if (arity == 2)
9916 /* If we thought this was a unary operator, we now know
9917 it to be a binary operator. */
9918 switch (operator_code)
9921 operator_code = MULT_EXPR;
9925 operator_code = BIT_AND_EXPR;
9928 case UNARY_PLUS_EXPR:
9929 operator_code = PLUS_EXPR;
9933 operator_code = MINUS_EXPR;
9936 case PREINCREMENT_EXPR:
9937 operator_code = POSTINCREMENT_EXPR;
9940 case PREDECREMENT_EXPR:
9941 operator_code = POSTDECREMENT_EXPR;
9948 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
9950 if ((operator_code == POSTINCREMENT_EXPR
9951 || operator_code == POSTDECREMENT_EXPR)
9952 && ! processing_template_decl
9953 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
9956 error ("postfix %qD must take %<int%> as its argument",
9959 error ("postfix %qD must take %<int%> as its second "
9967 error ("%qD must take either zero or one argument", decl);
9969 error ("%qD must take either one or two arguments", decl);
9973 /* More Effective C++ rule 6. */
9975 && (operator_code == POSTINCREMENT_EXPR
9976 || operator_code == POSTDECREMENT_EXPR
9977 || operator_code == PREINCREMENT_EXPR
9978 || operator_code == PREDECREMENT_EXPR))
9980 tree arg = TREE_VALUE (argtypes);
9981 tree ret = TREE_TYPE (TREE_TYPE (decl));
9982 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
9983 arg = TREE_TYPE (arg);
9984 arg = TYPE_MAIN_VARIANT (arg);
9985 if (operator_code == PREINCREMENT_EXPR
9986 || operator_code == PREDECREMENT_EXPR)
9988 if (TREE_CODE (ret) != REFERENCE_TYPE
9989 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
9991 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
9992 build_reference_type (arg));
9996 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
9997 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
10001 else if (unary_op_p (operator_code))
10006 error ("%qD must take %<void%>", decl);
10008 error ("%qD must take exactly one argument", decl);
10012 else /* if (binary_op_p (operator_code)) */
10017 error ("%qD must take exactly one argument", decl);
10019 error ("%qD must take exactly two arguments", decl);
10023 /* More Effective C++ rule 7. */
10025 && (operator_code == TRUTH_ANDIF_EXPR
10026 || operator_code == TRUTH_ORIF_EXPR
10027 || operator_code == COMPOUND_EXPR))
10028 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
10032 /* Effective C++ rule 23. */
10035 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
10036 && (operator_code == PLUS_EXPR
10037 || operator_code == MINUS_EXPR
10038 || operator_code == TRUNC_DIV_EXPR
10039 || operator_code == MULT_EXPR
10040 || operator_code == TRUNC_MOD_EXPR)
10041 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
10042 warning (OPT_Weffc__, "%qD should return by value", decl);
10044 /* [over.oper]/8 */
10045 for (; argtypes && argtypes != void_list_node;
10046 argtypes = TREE_CHAIN (argtypes))
10047 if (TREE_PURPOSE (argtypes))
10049 TREE_PURPOSE (argtypes) = NULL_TREE;
10050 if (operator_code == POSTINCREMENT_EXPR
10051 || operator_code == POSTDECREMENT_EXPR)
10054 pedwarn ("%qD cannot have default arguments", decl);
10058 error ("%qD cannot have default arguments", decl);
10066 /* Return a string giving the keyword associate with CODE. */
10068 static const char *
10069 tag_name (enum tag_types code)
10081 case typename_type:
10084 gcc_unreachable ();
10088 /* Name lookup in an elaborated-type-specifier (after the keyword
10089 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
10090 elaborated-type-specifier is invalid, issue a diagnostic and return
10091 error_mark_node; otherwise, return the *_TYPE to which it referred.
10092 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
10095 check_elaborated_type_specifier (enum tag_types tag_code,
10097 bool allow_template_p)
10103 struct S { struct S *p; };
10105 name lookup will find the TYPE_DECL for the implicit "S::S"
10106 typedef. Adjust for that here. */
10107 if (DECL_SELF_REFERENCE_P (decl))
10108 decl = TYPE_NAME (TREE_TYPE (decl));
10110 type = TREE_TYPE (decl);
10112 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
10113 is false for this case as well. */
10114 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
10116 error ("using template type parameter %qT after %qs",
10117 type, tag_name (tag_code));
10118 return error_mark_node;
10122 If the identifier resolves to a typedef-name or a template
10123 type-parameter, the elaborated-type-specifier is ill-formed.
10125 In other words, the only legitimate declaration to use in the
10126 elaborated type specifier is the implicit typedef created when
10127 the type is declared. */
10128 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
10129 && tag_code != typename_type)
10131 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
10132 error ("%q+D has a previous declaration here", decl);
10133 return error_mark_node;
10135 else if (TREE_CODE (type) != RECORD_TYPE
10136 && TREE_CODE (type) != UNION_TYPE
10137 && tag_code != enum_type
10138 && tag_code != typename_type)
10140 error ("%qT referred to as %qs", type, tag_name (tag_code));
10141 error ("%q+T has a previous declaration here", type);
10142 return error_mark_node;
10144 else if (TREE_CODE (type) != ENUMERAL_TYPE
10145 && tag_code == enum_type)
10147 error ("%qT referred to as enum", type);
10148 error ("%q+T has a previous declaration here", type);
10149 return error_mark_node;
10151 else if (!allow_template_p
10152 && TREE_CODE (type) == RECORD_TYPE
10153 && CLASSTYPE_IS_TEMPLATE (type))
10155 /* If a class template appears as elaborated type specifier
10156 without a template header such as:
10158 template <class T> class C {};
10159 void f(class C); // No template header here
10161 then the required template argument is missing. */
10162 error ("template argument required for %<%s %T%>",
10163 tag_name (tag_code),
10164 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
10165 return error_mark_node;
10171 /* Lookup NAME in elaborate type specifier in scope according to
10172 SCOPE and issue diagnostics if necessary.
10173 Return *_TYPE node upon success, NULL_TREE when the NAME is not
10174 found, and ERROR_MARK_NODE for type error. */
10177 lookup_and_check_tag (enum tag_types tag_code, tree name,
10178 tag_scope scope, bool template_header_p)
10182 if (scope == ts_global)
10184 /* First try ordinary name lookup, ignoring hidden class name
10185 injected via friend declaration. */
10186 decl = lookup_name_prefer_type (name, 2);
10187 /* If that fails, the name will be placed in the smallest
10188 non-class, non-function-prototype scope according to 3.3.1/5.
10189 We may already have a hidden name declared as friend in this
10190 scope. So lookup again but not ignoring hidden names.
10191 If we find one, that name will be made visible rather than
10192 creating a new tag. */
10194 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
10197 decl = lookup_type_scope (name, scope);
10199 if (decl && DECL_CLASS_TEMPLATE_P (decl))
10200 decl = DECL_TEMPLATE_RESULT (decl);
10202 if (decl && TREE_CODE (decl) == TYPE_DECL)
10204 /* Look for invalid nested type:
10208 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
10210 error ("%qD has the same name as the class in which it is "
10213 return error_mark_node;
10216 /* Two cases we need to consider when deciding if a class
10217 template is allowed as an elaborated type specifier:
10218 1. It is a self reference to its own class.
10219 2. It comes with a template header.
10223 template <class T> class C {
10224 class C *c1; // DECL_SELF_REFERENCE_P is true
10227 template <class U> class C; // template_header_p is true
10228 template <class T> class C<T>::D {
10229 class C *c2; // DECL_SELF_REFERENCE_P is true
10232 t = check_elaborated_type_specifier (tag_code,
10235 | DECL_SELF_REFERENCE_P (decl));
10238 else if (decl && TREE_CODE (decl) == TREE_LIST)
10240 error ("reference to %qD is ambiguous", name);
10241 print_candidates (decl);
10242 return error_mark_node;
10248 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
10249 Define the tag as a forward-reference if it is not defined.
10251 If a declaration is given, process it here, and report an error if
10252 multiple declarations are not identical.
10254 SCOPE is TS_CURRENT when this is also a definition. Only look in
10255 the current frame for the name (since C++ allows new names in any
10256 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
10257 declaration. Only look beginning from the current scope outward up
10258 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
10260 TEMPLATE_HEADER_P is true when this declaration is preceded by
10261 a set of template parameters. */
10264 xref_tag (enum tag_types tag_code, tree name,
10265 tag_scope scope, bool template_header_p)
10267 enum tree_code code;
10269 tree context = NULL_TREE;
10271 timevar_push (TV_NAME_LOOKUP);
10273 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
10279 code = RECORD_TYPE;
10285 code = ENUMERAL_TYPE;
10288 gcc_unreachable ();
10291 /* In case of anonymous name, xref_tag is only called to
10292 make type node and push name. Name lookup is not required. */
10293 if (ANON_AGGRNAME_P (name))
10296 t = lookup_and_check_tag (tag_code, name,
10297 scope, template_header_p);
10299 if (t == error_mark_node)
10300 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10302 if (scope != ts_current && t && current_class_type
10303 && template_class_depth (current_class_type)
10304 && template_header_p)
10306 /* Since SCOPE is not TS_CURRENT, we are not looking at a
10307 definition of this tag. Since, in addition, we are currently
10308 processing a (member) template declaration of a template
10309 class, we must be very careful; consider:
10316 { template <class V>
10317 friend struct S1; };
10319 Here, the S2::S1 declaration should not be confused with the
10320 outer declaration. In particular, the inner version should
10321 have a template parameter of level 2, not level 1. This
10322 would be particularly important if the member declaration
10325 template <class V = U> friend struct S1;
10327 say, when we should tsubst into `U' when instantiating
10328 S2. On the other hand, when presented with:
10338 we must find the inner binding eventually. We
10339 accomplish this by making sure that the new type we
10340 create to represent this declaration has the right
10342 context = TYPE_CONTEXT (t);
10348 /* If no such tag is yet defined, create a forward-reference node
10349 and record it as the "definition".
10350 When a real declaration of this type is found,
10351 the forward-reference will be altered into a real type. */
10352 if (code == ENUMERAL_TYPE)
10354 error ("use of enum %q#D without previous declaration", name);
10355 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10359 t = make_aggr_type (code);
10360 TYPE_CONTEXT (t) = context;
10361 t = pushtag (name, t, scope);
10366 if (template_header_p && IS_AGGR_TYPE (t))
10368 if (!redeclare_class_template (t, current_template_parms))
10369 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10371 else if (!processing_template_decl
10372 && CLASS_TYPE_P (t)
10373 && CLASSTYPE_IS_TEMPLATE (t))
10375 error ("redeclaration of %qT as a non-template", t);
10376 error ("previous declaration %q+D", t);
10377 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10380 /* Make injected friend class visible. */
10381 if (scope != ts_within_enclosing_non_class
10382 && hidden_name_p (TYPE_NAME (t)))
10384 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
10385 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
10387 if (TYPE_TEMPLATE_INFO (t))
10389 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
10390 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
10395 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t);
10399 xref_tag_from_type (tree old, tree id, tag_scope scope)
10401 enum tag_types tag_kind;
10403 if (TREE_CODE (old) == RECORD_TYPE)
10404 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
10406 tag_kind = union_type;
10408 if (id == NULL_TREE)
10409 id = TYPE_IDENTIFIER (old);
10411 return xref_tag (tag_kind, id, scope, false);
10414 /* Create the binfo hierarchy for REF with (possibly NULL) base list
10415 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
10416 access_* node, and the TREE_VALUE is the type of the base-class.
10417 Non-NULL TREE_TYPE indicates virtual inheritance.
10419 Returns true if the binfo hierarchy was successfully created,
10420 false if an error was detected. */
10423 xref_basetypes (tree ref, tree base_list)
10426 tree binfo, base_binfo;
10427 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
10428 unsigned max_bases = 0; /* Maximum direct bases. */
10430 tree default_access;
10431 tree igo_prev; /* Track Inheritance Graph Order. */
10433 if (ref == error_mark_node)
10436 /* The base of a derived class is private by default, all others are
10438 default_access = (TREE_CODE (ref) == RECORD_TYPE
10439 && CLASSTYPE_DECLARED_CLASS (ref)
10440 ? access_private_node : access_public_node);
10442 /* First, make sure that any templates in base-classes are
10443 instantiated. This ensures that if we call ourselves recursively
10444 we do not get confused about which classes are marked and which
10446 basep = &base_list;
10449 tree basetype = TREE_VALUE (*basep);
10451 if (!(processing_template_decl && uses_template_parms (basetype))
10452 && !complete_type_or_else (basetype, NULL))
10453 /* An incomplete type. Remove it from the list. */
10454 *basep = TREE_CHAIN (*basep);
10458 if (TREE_TYPE (*basep))
10460 if (CLASS_TYPE_P (basetype))
10461 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
10462 basep = &TREE_CHAIN (*basep);
10466 TYPE_MARKED_P (ref) = 1;
10468 /* The binfo slot should be empty, unless this is an (ill-formed)
10470 gcc_assert (!TYPE_BINFO (ref) || TYPE_SIZE (ref));
10471 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
10473 binfo = make_tree_binfo (max_bases);
10475 TYPE_BINFO (ref) = binfo;
10476 BINFO_OFFSET (binfo) = size_zero_node;
10477 BINFO_TYPE (binfo) = ref;
10481 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
10482 /* An aggregate cannot have baseclasses. */
10483 CLASSTYPE_NON_AGGREGATE (ref) = 1;
10485 if (TREE_CODE (ref) == UNION_TYPE)
10487 error ("derived union %qT invalid", ref);
10494 if (TYPE_FOR_JAVA (ref))
10496 error ("Java class %qT cannot have multiple bases", ref);
10503 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
10505 if (TYPE_FOR_JAVA (ref))
10507 error ("Java class %qT cannot have virtual bases", ref);
10512 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
10514 tree access = TREE_PURPOSE (base_list);
10515 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
10516 tree basetype = TREE_VALUE (base_list);
10518 if (access == access_default_node)
10519 access = default_access;
10521 if (PACK_EXPANSION_P (basetype))
10522 basetype = PACK_EXPANSION_PATTERN (basetype);
10523 if (TREE_CODE (basetype) == TYPE_DECL)
10524 basetype = TREE_TYPE (basetype);
10525 if (TREE_CODE (basetype) != RECORD_TYPE
10526 && TREE_CODE (basetype) != TYPENAME_TYPE
10527 && TREE_CODE (basetype) != TEMPLATE_TYPE_PARM
10528 && TREE_CODE (basetype) != BOUND_TEMPLATE_TEMPLATE_PARM)
10530 error ("base type %qT fails to be a struct or class type",
10535 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
10536 TYPE_FOR_JAVA (ref) = 1;
10538 base_binfo = NULL_TREE;
10539 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
10541 base_binfo = TYPE_BINFO (basetype);
10542 /* The original basetype could have been a typedef'd type. */
10543 basetype = BINFO_TYPE (base_binfo);
10545 /* Inherit flags from the base. */
10546 TYPE_HAS_NEW_OPERATOR (ref)
10547 |= TYPE_HAS_NEW_OPERATOR (basetype);
10548 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
10549 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
10550 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
10551 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
10552 CLASSTYPE_DIAMOND_SHAPED_P (ref)
10553 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
10554 CLASSTYPE_REPEATED_BASE_P (ref)
10555 |= CLASSTYPE_REPEATED_BASE_P (basetype);
10558 /* We must do this test after we've seen through a typedef
10560 if (TYPE_MARKED_P (basetype))
10562 if (basetype == ref)
10563 error ("recursive type %qT undefined", basetype);
10565 error ("duplicate base type %qT invalid", basetype);
10569 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
10570 /* Regenerate the pack expansion for the bases. */
10571 basetype = make_pack_expansion (basetype);
10573 TYPE_MARKED_P (basetype) = 1;
10575 base_binfo = copy_binfo (base_binfo, basetype, ref,
10576 &igo_prev, via_virtual);
10577 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
10578 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
10580 BINFO_BASE_APPEND (binfo, base_binfo);
10581 BINFO_BASE_ACCESS_APPEND (binfo, access);
10584 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
10585 /* If we have space in the vbase vector, we must have shared at
10586 least one of them, and are therefore diamond shaped. */
10587 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
10589 /* Unmark all the types. */
10590 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
10591 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
10592 TYPE_MARKED_P (ref) = 0;
10594 /* Now see if we have a repeated base type. */
10595 if (!CLASSTYPE_REPEATED_BASE_P (ref))
10597 for (base_binfo = binfo; base_binfo;
10598 base_binfo = TREE_CHAIN (base_binfo))
10600 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
10602 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
10605 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
10607 for (base_binfo = binfo; base_binfo;
10608 base_binfo = TREE_CHAIN (base_binfo))
10609 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
10610 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
10619 /* Begin compiling the definition of an enumeration type.
10621 Returns the type object, as yet incomplete.
10622 Also records info about it so that build_enumerator
10623 may be used to declare the individual values as they are read. */
10626 start_enum (tree name)
10630 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
10632 /* If this is the real definition for a previous forward reference,
10633 fill in the contents in the same object that used to be the
10634 forward reference. */
10636 enumtype = lookup_and_check_tag (enum_type, name,
10637 /*tag_scope=*/ts_current,
10638 /*template_header_p=*/false);
10640 if (enumtype != NULL_TREE && TREE_CODE (enumtype) == ENUMERAL_TYPE)
10642 error ("multiple definition of %q#T", enumtype);
10643 error ("%Jprevious definition here", TYPE_MAIN_DECL (enumtype));
10644 /* Clear out TYPE_VALUES, and start again. */
10645 TYPE_VALUES (enumtype) = NULL_TREE;
10649 /* In case of error, make a dummy enum to allow parsing to
10651 if (enumtype == error_mark_node)
10652 name = make_anon_name ();
10654 enumtype = make_node (ENUMERAL_TYPE);
10655 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
10661 /* After processing and defining all the values of an enumeration type,
10662 install their decls in the enumeration type and finish it off.
10663 ENUMTYPE is the type object and VALUES a list of name-value pairs. */
10666 finish_enum (tree enumtype)
10675 bool use_short_enum;
10679 integer_type_kind itk;
10680 tree underlying_type = NULL_TREE;
10682 /* We built up the VALUES in reverse order. */
10683 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
10685 /* For an enum defined in a template, just set the type of the values;
10686 all further processing is postponed until the template is
10687 instantiated. We need to set the type so that tsubst of a CONST_DECL
10689 if (processing_template_decl)
10691 for (values = TYPE_VALUES (enumtype);
10693 values = TREE_CHAIN (values))
10694 TREE_TYPE (TREE_VALUE (values)) = enumtype;
10695 if (at_function_scope_p ())
10696 add_stmt (build_min (TAG_DEFN, enumtype));
10700 /* Determine the minimum and maximum values of the enumerators. */
10701 if (TYPE_VALUES (enumtype))
10703 minnode = maxnode = NULL_TREE;
10705 for (values = TYPE_VALUES (enumtype);
10707 values = TREE_CHAIN (values))
10709 decl = TREE_VALUE (values);
10711 /* [dcl.enum]: Following the closing brace of an enum-specifier,
10712 each enumerator has the type of its enumeration. Prior to the
10713 closing brace, the type of each enumerator is the type of its
10714 initializing value. */
10715 TREE_TYPE (decl) = enumtype;
10717 /* Update the minimum and maximum values, if appropriate. */
10718 value = DECL_INITIAL (decl);
10719 if (value == error_mark_node)
10720 value = integer_zero_node;
10721 /* Figure out what the minimum and maximum values of the
10722 enumerators are. */
10724 minnode = maxnode = value;
10725 else if (tree_int_cst_lt (maxnode, value))
10727 else if (tree_int_cst_lt (value, minnode))
10734 If the enumerator-list is empty, the underlying type is as if
10735 the enumeration had a single enumerator with value 0. */
10736 minnode = maxnode = integer_zero_node;
10738 /* Compute the number of bits require to represent all values of the
10739 enumeration. We must do this before the type of MINNODE and
10740 MAXNODE are transformed, since min_precision relies on the
10741 TREE_TYPE of the value it is passed. */
10742 unsignedp = tree_int_cst_sgn (minnode) >= 0;
10743 lowprec = min_precision (minnode, unsignedp);
10744 highprec = min_precision (maxnode, unsignedp);
10745 precision = MAX (lowprec, highprec);
10747 /* Determine the underlying type of the enumeration.
10751 The underlying type of an enumeration is an integral type that
10752 can represent all the enumerator values defined in the
10753 enumeration. It is implementation-defined which integral type is
10754 used as the underlying type for an enumeration except that the
10755 underlying type shall not be larger than int unless the value of
10756 an enumerator cannot fit in an int or unsigned int.
10758 We use "int" or an "unsigned int" as the underlying type, even if
10759 a smaller integral type would work, unless the user has
10760 explicitly requested that we use the smallest possible type. The
10761 user can request that for all enumerations with a command line
10762 flag, or for just one enumeration with an attribute. */
10764 use_short_enum = flag_short_enums
10765 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
10767 for (itk = (use_short_enum ? itk_char : itk_int);
10771 underlying_type = integer_types[itk];
10772 if (TYPE_PRECISION (underlying_type) >= precision
10773 && TYPE_UNSIGNED (underlying_type) == unsignedp)
10776 if (itk == itk_none)
10780 IF no integral type can represent all the enumerator values, the
10781 enumeration is ill-formed. */
10782 error ("no integral type can represent all of the enumerator values "
10783 "for %qT", enumtype);
10784 precision = TYPE_PRECISION (long_long_integer_type_node);
10785 underlying_type = integer_types[itk_unsigned_long_long];
10788 /* Compute the minium and maximum values for the type.
10792 For an enumeration where emin is the smallest enumerator and emax
10793 is the largest, the values of the enumeration are the values of the
10794 underlying type in the range bmin to bmax, where bmin and bmax are,
10795 respectively, the smallest and largest values of the smallest bit-
10796 field that can store emin and emax. */
10798 /* The middle-end currently assumes that types with TYPE_PRECISION
10799 narrower than their underlying type are suitably zero or sign
10800 extended to fill their mode. g++ doesn't make these guarantees.
10801 Until the middle-end can represent such paradoxical types, we
10802 set the TYPE_PRECISION to the width of the underlying type. */
10803 TYPE_PRECISION (enumtype) = TYPE_PRECISION (underlying_type);
10805 set_min_and_max_values_for_integral_type (enumtype, precision, unsignedp);
10809 The value of sizeof() applied to an enumeration type, an object
10810 of an enumeration type, or an enumerator, is the value of sizeof()
10811 applied to the underlying type. */
10812 TYPE_SIZE (enumtype) = TYPE_SIZE (underlying_type);
10813 TYPE_SIZE_UNIT (enumtype) = TYPE_SIZE_UNIT (underlying_type);
10814 TYPE_MODE (enumtype) = TYPE_MODE (underlying_type);
10815 TYPE_ALIGN (enumtype) = TYPE_ALIGN (underlying_type);
10816 TYPE_USER_ALIGN (enumtype) = TYPE_USER_ALIGN (underlying_type);
10817 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (underlying_type);
10819 /* Convert each of the enumerators to the type of the underlying
10820 type of the enumeration. */
10821 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
10823 location_t saved_location;
10825 decl = TREE_VALUE (values);
10826 saved_location = input_location;
10827 input_location = DECL_SOURCE_LOCATION (decl);
10828 value = perform_implicit_conversion (underlying_type,
10829 DECL_INITIAL (decl));
10830 input_location = saved_location;
10832 /* Do not clobber shared ints. */
10833 value = copy_node (value);
10835 TREE_TYPE (value) = enumtype;
10836 DECL_INITIAL (decl) = value;
10837 TREE_VALUE (values) = value;
10840 /* Fix up all variant types of this enum type. */
10841 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
10843 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
10844 TYPE_MIN_VALUE (t) = TYPE_MIN_VALUE (enumtype);
10845 TYPE_MAX_VALUE (t) = TYPE_MAX_VALUE (enumtype);
10846 TYPE_SIZE (t) = TYPE_SIZE (enumtype);
10847 TYPE_SIZE_UNIT (t) = TYPE_SIZE_UNIT (enumtype);
10848 TYPE_MODE (t) = TYPE_MODE (enumtype);
10849 TYPE_PRECISION (t) = TYPE_PRECISION (enumtype);
10850 TYPE_ALIGN (t) = TYPE_ALIGN (enumtype);
10851 TYPE_USER_ALIGN (t) = TYPE_USER_ALIGN (enumtype);
10852 TYPE_UNSIGNED (t) = TYPE_UNSIGNED (enumtype);
10855 /* Finish debugging output for this type. */
10856 rest_of_type_compilation (enumtype, namespace_bindings_p ());
10859 /* Build and install a CONST_DECL for an enumeration constant of the
10860 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
10861 Assignment of sequential values by default is handled here. */
10864 build_enumerator (tree name, tree value, tree enumtype)
10870 /* If the VALUE was erroneous, pretend it wasn't there; that will
10871 result in the enum being assigned the next value in sequence. */
10872 if (value == error_mark_node)
10875 /* Remove no-op casts from the value. */
10877 STRIP_TYPE_NOPS (value);
10879 if (! processing_template_decl)
10881 /* Validate and default VALUE. */
10882 if (value != NULL_TREE)
10884 value = integral_constant_value (value);
10886 if (TREE_CODE (value) == INTEGER_CST)
10888 value = perform_integral_promotions (value);
10889 constant_expression_warning (value);
10893 error ("enumerator value for %qD is not an integer constant", name);
10898 /* Default based on previous value. */
10899 if (value == NULL_TREE)
10901 if (TYPE_VALUES (enumtype))
10904 unsigned HOST_WIDE_INT lo;
10908 /* The next value is the previous value plus one. We can
10909 safely assume that the previous value is an INTEGER_CST.
10910 add_double doesn't know the type of the target expression,
10911 so we must check with int_fits_type_p as well. */
10912 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
10913 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
10914 TREE_INT_CST_HIGH (prev_value),
10916 value = build_int_cst_wide (TREE_TYPE (prev_value), lo, hi);
10917 overflowed |= !int_fits_type_p (value, TREE_TYPE (prev_value));
10921 error ("overflow in enumeration values at %qD", name);
10922 value = error_mark_node;
10926 value = integer_zero_node;
10929 /* Remove no-op casts from the value. */
10930 STRIP_TYPE_NOPS (value);
10933 /* C++ associates enums with global, function, or class declarations. */
10934 context = current_scope ();
10936 /* Build the actual enumeration constant. Note that the enumeration
10937 constants have the type of their initializers until the
10938 enumeration is complete:
10942 Following the closing brace of an enum-specifier, each enumer-
10943 ator has the type of its enumeration. Prior to the closing
10944 brace, the type of each enumerator is the type of its
10945 initializing value.
10947 In finish_enum we will reset the type. Of course, if we're
10948 processing a template, there may be no value. */
10949 type = value ? TREE_TYPE (value) : NULL_TREE;
10951 if (context && context == current_class_type)
10952 /* This enum declaration is local to the class. We need the full
10953 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
10954 decl = build_lang_decl (CONST_DECL, name, type);
10956 /* It's a global enum, or it's local to a function. (Note local to
10957 a function could mean local to a class method. */
10958 decl = build_decl (CONST_DECL, name, type);
10960 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
10961 TREE_CONSTANT (decl) = 1;
10962 TREE_INVARIANT (decl) = 1;
10963 TREE_READONLY (decl) = 1;
10964 DECL_INITIAL (decl) = value;
10966 if (context && context == current_class_type)
10967 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
10968 on the TYPE_FIELDS list for `S'. (That's so that you can say
10969 things like `S::i' later.) */
10970 finish_member_declaration (decl);
10974 /* Add this enumeration constant to the list for this type. */
10975 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
10979 /* We're defining DECL. Make sure that it's type is OK. */
10982 check_function_type (tree decl, tree current_function_parms)
10984 tree fntype = TREE_TYPE (decl);
10985 tree return_type = complete_type (TREE_TYPE (fntype));
10987 /* In a function definition, arg types must be complete. */
10988 require_complete_types_for_parms (current_function_parms);
10990 if (dependent_type_p (return_type))
10992 if (!COMPLETE_OR_VOID_TYPE_P (return_type)
10993 || (TYPE_FOR_JAVA (return_type) && IS_AGGR_TYPE (return_type)))
10995 tree args = TYPE_ARG_TYPES (fntype);
10997 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
10998 error ("return type %q#T is incomplete", return_type);
11000 error ("return type has Java class type %q#T", return_type);
11002 /* Make it return void instead. */
11003 if (TREE_CODE (fntype) == METHOD_TYPE)
11004 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
11006 TREE_CHAIN (args));
11008 fntype = build_function_type (void_type_node, args);
11010 = build_exception_variant (fntype,
11011 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
11014 abstract_virtuals_error (decl, TREE_TYPE (fntype));
11017 /* Create the FUNCTION_DECL for a function definition.
11018 DECLSPECS and DECLARATOR are the parts of the declaration;
11019 they describe the function's name and the type it returns,
11020 but twisted together in a fashion that parallels the syntax of C.
11022 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
11023 DECLARATOR is really the DECL for the function we are about to
11024 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
11025 indicating that the function is an inline defined in-class.
11027 This function creates a binding context for the function body
11028 as well as setting up the FUNCTION_DECL in current_function_decl.
11030 For C++, we must first check whether that datum makes any sense.
11031 For example, "class A local_a(1,2);" means that variable local_a
11032 is an aggregate of type A, which should have a constructor
11033 applied to it with the argument list [1, 2].
11035 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
11036 or may be a BLOCK if the function has been defined previously
11037 in this translation unit. On exit, DECL_INITIAL (decl1) will be
11038 error_mark_node if the function has never been defined, or
11039 a BLOCK if the function has been defined somewhere. */
11042 start_preparsed_function (tree decl1, tree attrs, int flags)
11044 tree ctype = NULL_TREE;
11047 int doing_friend = 0;
11048 struct cp_binding_level *bl;
11049 tree current_function_parms;
11050 struct c_fileinfo *finfo
11051 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
11052 bool honor_interface;
11054 /* Sanity check. */
11055 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
11056 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
11058 fntype = TREE_TYPE (decl1);
11059 if (TREE_CODE (fntype) == METHOD_TYPE)
11060 ctype = TYPE_METHOD_BASETYPE (fntype);
11062 /* ISO C++ 11.4/5. A friend function defined in a class is in
11063 the (lexical) scope of the class in which it is defined. */
11064 if (!ctype && DECL_FRIEND_P (decl1))
11066 ctype = DECL_FRIEND_CONTEXT (decl1);
11068 /* CTYPE could be null here if we're dealing with a template;
11069 for example, `inline friend float foo()' inside a template
11070 will have no CTYPE set. */
11071 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
11077 if (DECL_DECLARED_INLINE_P (decl1)
11078 && lookup_attribute ("noinline", attrs))
11079 warning (0, "inline function %q+D given attribute noinline", decl1);
11081 /* Handle gnu_inline attribute. */
11082 if (GNU_INLINE_P (decl1))
11084 DECL_EXTERNAL (decl1) = 1;
11085 DECL_NOT_REALLY_EXTERN (decl1) = 0;
11086 DECL_INTERFACE_KNOWN (decl1) = 1;
11087 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
11090 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
11091 /* This is a constructor, we must ensure that any default args
11092 introduced by this definition are propagated to the clones
11093 now. The clones are used directly in overload resolution. */
11094 adjust_clone_args (decl1);
11096 /* Sometimes we don't notice that a function is a static member, and
11097 build a METHOD_TYPE for it. Fix that up now. */
11098 if (ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
11099 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE)
11101 revert_static_member_fn (decl1);
11105 /* Set up current_class_type, and enter the scope of the class, if
11108 push_nested_class (ctype);
11109 else if (DECL_STATIC_FUNCTION_P (decl1))
11110 push_nested_class (DECL_CONTEXT (decl1));
11112 /* Now that we have entered the scope of the class, we must restore
11113 the bindings for any template parameters surrounding DECL1, if it
11114 is an inline member template. (Order is important; consider the
11115 case where a template parameter has the same name as a field of
11116 the class.) It is not until after this point that
11117 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
11118 if (flags & SF_INCLASS_INLINE)
11119 maybe_begin_member_template_processing (decl1);
11121 /* Effective C++ rule 15. */
11123 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
11124 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
11125 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
11127 /* Make the init_value nonzero so pushdecl knows this is not tentative.
11128 error_mark_node is replaced below (in poplevel) with the BLOCK. */
11129 if (!DECL_INITIAL (decl1))
11130 DECL_INITIAL (decl1) = error_mark_node;
11132 /* This function exists in static storage.
11133 (This does not mean `static' in the C sense!) */
11134 TREE_STATIC (decl1) = 1;
11136 /* We must call push_template_decl after current_class_type is set
11137 up. (If we are processing inline definitions after exiting a
11138 class scope, current_class_type will be NULL_TREE until set above
11139 by push_nested_class.) */
11140 if (processing_template_decl)
11142 /* FIXME: Handle error_mark_node more gracefully. */
11143 tree newdecl1 = push_template_decl (decl1);
11144 if (newdecl1 != error_mark_node)
11148 /* We are now in the scope of the function being defined. */
11149 current_function_decl = decl1;
11151 /* Save the parm names or decls from this function's declarator
11152 where store_parm_decls will find them. */
11153 current_function_parms = DECL_ARGUMENTS (decl1);
11155 /* Make sure the parameter and return types are reasonable. When
11156 you declare a function, these types can be incomplete, but they
11157 must be complete when you define the function. */
11158 check_function_type (decl1, current_function_parms);
11160 /* Build the return declaration for the function. */
11161 restype = TREE_TYPE (fntype);
11162 if (DECL_RESULT (decl1) == NULL_TREE)
11166 resdecl = build_decl (RESULT_DECL, 0, TYPE_MAIN_VARIANT (restype));
11167 DECL_ARTIFICIAL (resdecl) = 1;
11168 DECL_IGNORED_P (resdecl) = 1;
11169 DECL_RESULT (decl1) = resdecl;
11171 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
11174 /* Let the user know we're compiling this function. */
11175 announce_function (decl1);
11177 /* Record the decl so that the function name is defined.
11178 If we already have a decl for this name, and it is a FUNCTION_DECL,
11179 use the old decl. */
11180 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
11182 /* A specialization is not used to guide overload resolution. */
11183 if (!DECL_FUNCTION_MEMBER_P (decl1)
11184 && !(DECL_USE_TEMPLATE (decl1) &&
11185 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
11187 tree olddecl = pushdecl (decl1);
11189 if (olddecl == error_mark_node)
11190 /* If something went wrong when registering the declaration,
11191 use DECL1; we have to have a FUNCTION_DECL to use when
11192 parsing the body of the function. */
11196 /* Otherwise, OLDDECL is either a previous declaration
11197 of the same function or DECL1 itself. */
11199 if (warn_missing_declarations
11200 && olddecl == decl1
11201 && !DECL_MAIN_P (decl1)
11202 && TREE_PUBLIC (decl1)
11203 && !DECL_DECLARED_INLINE_P (decl1))
11207 /* Check whether DECL1 is in an anonymous
11209 for (context = DECL_CONTEXT (decl1);
11211 context = DECL_CONTEXT (context))
11213 if (TREE_CODE (context) == NAMESPACE_DECL
11214 && DECL_NAME (context) == NULL_TREE)
11218 if (context == NULL)
11219 warning (OPT_Wmissing_declarations,
11220 "no previous declaration for %q+D", decl1);
11228 /* We need to set the DECL_CONTEXT. */
11229 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
11230 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
11232 fntype = TREE_TYPE (decl1);
11234 /* If #pragma weak applies, mark the decl appropriately now.
11235 The pragma only applies to global functions. Because
11236 determining whether or not the #pragma applies involves
11237 computing the mangled name for the declaration, we cannot
11238 apply the pragma until after we have merged this declaration
11239 with any previous declarations; if the original declaration
11240 has a linkage specification, that specification applies to
11241 the definition as well, and may affect the mangled name. */
11242 if (!DECL_CONTEXT (decl1))
11243 maybe_apply_pragma_weak (decl1);
11246 /* Reset this in case the call to pushdecl changed it. */
11247 current_function_decl = decl1;
11249 gcc_assert (DECL_INITIAL (decl1));
11251 /* This function may already have been parsed, in which case just
11252 return; our caller will skip over the body without parsing. */
11253 if (DECL_INITIAL (decl1) != error_mark_node)
11256 /* Initialize RTL machinery. We cannot do this until
11257 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
11258 even when processing a template; this is how we get
11259 CFUN set up, and our per-function variables initialized.
11260 FIXME factor out the non-RTL stuff. */
11261 bl = current_binding_level;
11262 allocate_struct_function (decl1, processing_template_decl);
11263 current_binding_level = bl;
11265 /* Even though we're inside a function body, we still don't want to
11266 call expand_expr to calculate the size of a variable-sized array.
11267 We haven't necessarily assigned RTL to all variables yet, so it's
11268 not safe to try to expand expressions involving them. */
11269 cfun->x_dont_save_pending_sizes_p = 1;
11271 /* Start the statement-tree, start the tree now. */
11272 DECL_SAVED_TREE (decl1) = push_stmt_list ();
11274 /* If we are (erroneously) defining a function that we have already
11275 defined before, wipe out what we knew before. */
11276 if (!DECL_PENDING_INLINE_P (decl1))
11277 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
11279 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
11281 /* We know that this was set up by `grokclassfn'. We do not
11282 wait until `store_parm_decls', since evil parse errors may
11283 never get us to that point. Here we keep the consistency
11284 between `current_class_type' and `current_class_ptr'. */
11285 tree t = DECL_ARGUMENTS (decl1);
11287 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
11288 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
11290 cp_function_chain->x_current_class_ref
11291 = build_indirect_ref (t, NULL);
11292 cp_function_chain->x_current_class_ptr = t;
11294 /* Constructors and destructors need to know whether they're "in
11295 charge" of initializing virtual base classes. */
11296 t = TREE_CHAIN (t);
11297 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
11299 current_in_charge_parm = t;
11300 t = TREE_CHAIN (t);
11302 if (DECL_HAS_VTT_PARM_P (decl1))
11304 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
11305 current_vtt_parm = t;
11309 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
11310 /* Implicitly-defined methods (like the
11311 destructor for a class in which no destructor
11312 is explicitly declared) must not be defined
11313 until their definition is needed. So, we
11314 ignore interface specifications for
11315 compiler-generated functions. */
11316 && !DECL_ARTIFICIAL (decl1));
11318 if (DECL_INTERFACE_KNOWN (decl1))
11320 tree ctx = decl_function_context (decl1);
11322 if (DECL_NOT_REALLY_EXTERN (decl1))
11323 DECL_EXTERNAL (decl1) = 0;
11325 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
11326 && TREE_PUBLIC (ctx))
11327 /* This is a function in a local class in an extern inline
11329 comdat_linkage (decl1);
11331 /* If this function belongs to an interface, it is public.
11332 If it belongs to someone else's interface, it is also external.
11333 This only affects inlines and template instantiations. */
11334 else if (!finfo->interface_unknown && honor_interface)
11336 if (DECL_DECLARED_INLINE_P (decl1)
11337 || DECL_TEMPLATE_INSTANTIATION (decl1)
11338 || processing_template_decl)
11340 DECL_EXTERNAL (decl1)
11341 = (finfo->interface_only
11342 || (DECL_DECLARED_INLINE_P (decl1)
11343 && ! flag_implement_inlines
11344 && !DECL_VINDEX (decl1)));
11346 /* For WIN32 we also want to put these in linkonce sections. */
11347 maybe_make_one_only (decl1);
11350 DECL_EXTERNAL (decl1) = 0;
11351 DECL_INTERFACE_KNOWN (decl1) = 1;
11352 /* If this function is in an interface implemented in this file,
11353 make sure that the back end knows to emit this function
11355 if (!DECL_EXTERNAL (decl1))
11356 mark_needed (decl1);
11358 else if (finfo->interface_unknown && finfo->interface_only
11359 && honor_interface)
11361 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
11362 interface, we will have both finfo->interface_unknown and
11363 finfo->interface_only set. In that case, we don't want to
11364 use the normal heuristics because someone will supply a
11365 #pragma implementation elsewhere, and deducing it here would
11366 produce a conflict. */
11367 comdat_linkage (decl1);
11368 DECL_EXTERNAL (decl1) = 0;
11369 DECL_INTERFACE_KNOWN (decl1) = 1;
11370 DECL_DEFER_OUTPUT (decl1) = 1;
11374 /* This is a definition, not a reference.
11375 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
11376 if (!GNU_INLINE_P (decl1))
11377 DECL_EXTERNAL (decl1) = 0;
11379 if ((DECL_DECLARED_INLINE_P (decl1)
11380 || DECL_TEMPLATE_INSTANTIATION (decl1))
11381 && ! DECL_INTERFACE_KNOWN (decl1)
11382 /* Don't try to defer nested functions for now. */
11383 && ! decl_function_context (decl1))
11384 DECL_DEFER_OUTPUT (decl1) = 1;
11386 DECL_INTERFACE_KNOWN (decl1) = 1;
11389 /* Determine the ELF visibility attribute for the function. We must not
11390 do this before calling "pushdecl", as we must allow "duplicate_decls"
11391 to merge any attributes appropriately. We also need to wait until
11393 if (!DECL_CLONED_FUNCTION_P (decl1))
11394 determine_visibility (decl1);
11396 begin_scope (sk_function_parms, decl1);
11400 if (DECL_DESTRUCTOR_P (decl1)
11401 || (DECL_CONSTRUCTOR_P (decl1)
11402 && targetm.cxx.cdtor_returns_this ()))
11404 cdtor_label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
11405 DECL_CONTEXT (cdtor_label) = current_function_decl;
11408 start_fname_decls ();
11410 store_parm_decls (current_function_parms);
11414 /* Like start_preparsed_function, except that instead of a
11415 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
11417 Returns 1 on success. If the DECLARATOR is not suitable for a function
11418 (it defines a datum instead), we return 0, which tells
11419 yyparse to report a parse error. */
11422 start_function (cp_decl_specifier_seq *declspecs,
11423 const cp_declarator *declarator,
11428 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
11429 /* If the declarator is not suitable for a function definition,
11430 cause a syntax error. */
11431 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
11434 if (DECL_MAIN_P (decl1))
11435 /* main must return int. grokfndecl should have corrected it
11436 (and issued a diagnostic) if the user got it wrong. */
11437 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
11438 integer_type_node));
11440 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
11445 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
11449 use_eh_spec_block (tree fn)
11451 return (flag_exceptions && flag_enforce_eh_specs
11452 && !processing_template_decl
11453 && TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn))
11454 /* We insert the EH_SPEC_BLOCK only in the original
11455 function; then, it is copied automatically to the
11457 && !DECL_CLONED_FUNCTION_P (fn)
11458 /* Implicitly-generated constructors and destructors have
11459 exception specifications. However, those specifications
11460 are the union of the possible exceptions specified by the
11461 constructors/destructors for bases and members, so no
11462 unallowed exception will ever reach this function. By
11463 not creating the EH_SPEC_BLOCK we save a little memory,
11464 and we avoid spurious warnings about unreachable
11466 && !DECL_ARTIFICIAL (fn));
11469 /* Store the parameter declarations into the current function declaration.
11470 This is called after parsing the parameter declarations, before
11471 digesting the body of the function.
11473 Also install to binding contour return value identifier, if any. */
11476 store_parm_decls (tree current_function_parms)
11478 tree fndecl = current_function_decl;
11481 /* This is a chain of any other decls that came in among the parm
11482 declarations. If a parm is declared with enum {foo, bar} x;
11483 then CONST_DECLs for foo and bar are put here. */
11484 tree nonparms = NULL_TREE;
11486 if (current_function_parms)
11488 /* This case is when the function was defined with an ANSI prototype.
11489 The parms already have decls, so we need not do anything here
11490 except record them as in effect
11491 and complain if any redundant old-style parm decls were written. */
11493 tree specparms = current_function_parms;
11496 /* Must clear this because it might contain TYPE_DECLs declared
11498 current_binding_level->names = NULL;
11500 /* If we're doing semantic analysis, then we'll call pushdecl
11501 for each of these. We must do them in reverse order so that
11502 they end in the correct forward order. */
11503 specparms = nreverse (specparms);
11505 for (parm = specparms; parm; parm = next)
11507 next = TREE_CHAIN (parm);
11508 if (TREE_CODE (parm) == PARM_DECL)
11510 if (DECL_NAME (parm) == NULL_TREE
11511 || TREE_CODE (parm) != VOID_TYPE)
11514 error ("parameter %qD declared void", parm);
11518 /* If we find an enum constant or a type tag,
11519 put it aside for the moment. */
11520 TREE_CHAIN (parm) = NULL_TREE;
11521 nonparms = chainon (nonparms, parm);
11525 /* Get the decls in their original chain order and record in the
11526 function. This is all and only the PARM_DECLs that were
11527 pushed into scope by the loop above. */
11528 DECL_ARGUMENTS (fndecl) = getdecls ();
11531 DECL_ARGUMENTS (fndecl) = NULL_TREE;
11533 /* Now store the final chain of decls for the arguments
11534 as the decl-chain of the current lexical scope.
11535 Put the enumerators in as well, at the front so that
11536 DECL_ARGUMENTS is not modified. */
11537 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
11539 if (use_eh_spec_block (current_function_decl))
11540 current_eh_spec_block = begin_eh_spec_block ();
11544 /* We have finished doing semantic analysis on DECL, but have not yet
11545 generated RTL for its body. Save away our current state, so that
11546 when we want to generate RTL later we know what to do. */
11549 save_function_data (tree decl)
11551 struct language_function *f;
11553 /* Save the language-specific per-function data so that we can
11554 get it back when we really expand this function. */
11555 gcc_assert (!DECL_PENDING_INLINE_P (decl));
11558 f = GGC_NEW (struct language_function);
11559 memcpy (f, cp_function_chain, sizeof (struct language_function));
11560 DECL_SAVED_FUNCTION_DATA (decl) = f;
11562 /* Clear out the bits we don't need. */
11563 f->base.x_stmt_tree.x_cur_stmt_list = NULL_TREE;
11564 f->bindings = NULL;
11565 f->x_local_names = NULL;
11569 /* Set the return value of the constructor (if present). */
11572 finish_constructor_body (void)
11577 if (targetm.cxx.cdtor_returns_this ())
11579 /* Any return from a constructor will end up here. */
11580 add_stmt (build_stmt (LABEL_EXPR, cdtor_label));
11582 val = DECL_ARGUMENTS (current_function_decl);
11583 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
11584 DECL_RESULT (current_function_decl), val);
11585 /* Return the address of the object. */
11586 exprstmt = build_stmt (RETURN_EXPR, val);
11587 add_stmt (exprstmt);
11591 /* Do all the processing for the beginning of a destructor; set up the
11592 vtable pointers and cleanups for bases and members. */
11595 begin_destructor_body (void)
11597 tree compound_stmt;
11599 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
11600 issued an error message. We still want to try to process the
11601 body of the function, but initialize_vtbl_ptrs will crash if
11602 TYPE_BINFO is NULL. */
11603 if (COMPLETE_TYPE_P (current_class_type))
11605 compound_stmt = begin_compound_stmt (0);
11606 /* Make all virtual function table pointers in non-virtual base
11607 classes point to CURRENT_CLASS_TYPE's virtual function
11609 initialize_vtbl_ptrs (current_class_ptr);
11610 finish_compound_stmt (compound_stmt);
11612 /* And insert cleanups for our bases and members so that they
11613 will be properly destroyed if we throw. */
11614 push_base_cleanups ();
11618 /* At the end of every destructor we generate code to delete the object if
11619 necessary. Do that now. */
11622 finish_destructor_body (void)
11626 /* Any return from a destructor will end up here; that way all base
11627 and member cleanups will be run when the function returns. */
11628 add_stmt (build_stmt (LABEL_EXPR, cdtor_label));
11630 /* In a virtual destructor, we must call delete. */
11631 if (DECL_VIRTUAL_P (current_function_decl))
11634 tree virtual_size = cxx_sizeof (current_class_type);
11638 At the point of definition of a virtual destructor (including
11639 an implicit definition), non-placement operator delete shall
11640 be looked up in the scope of the destructor's class and if
11641 found shall be accessible and unambiguous. */
11642 exprstmt = build_op_delete_call(DELETE_EXPR, current_class_ptr,
11644 /*global_p=*/false,
11645 /*placement=*/NULL_TREE,
11646 /*alloc_fn=*/NULL_TREE);
11648 if_stmt = begin_if_stmt ();
11649 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
11650 current_in_charge_parm,
11653 finish_expr_stmt (exprstmt);
11654 finish_then_clause (if_stmt);
11655 finish_if_stmt (if_stmt);
11658 if (targetm.cxx.cdtor_returns_this ())
11662 val = DECL_ARGUMENTS (current_function_decl);
11663 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
11664 DECL_RESULT (current_function_decl), val);
11665 /* Return the address of the object. */
11666 exprstmt = build_stmt (RETURN_EXPR, val);
11667 add_stmt (exprstmt);
11671 /* Do the necessary processing for the beginning of a function body, which
11672 in this case includes member-initializers, but not the catch clauses of
11673 a function-try-block. Currently, this means opening a binding level
11674 for the member-initializers (in a ctor) and member cleanups (in a dtor). */
11677 begin_function_body (void)
11681 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
11684 if (processing_template_decl)
11685 /* Do nothing now. */;
11687 /* Always keep the BLOCK node associated with the outermost pair of
11688 curly braces of a function. These are needed for correct
11689 operation of dwarfout.c. */
11690 keep_next_level (true);
11692 stmt = begin_compound_stmt (BCS_FN_BODY);
11694 if (processing_template_decl)
11695 /* Do nothing now. */;
11696 else if (DECL_DESTRUCTOR_P (current_function_decl))
11697 begin_destructor_body ();
11702 /* Do the processing for the end of a function body. Currently, this means
11703 closing out the cleanups for fully-constructed bases and members, and in
11704 the case of the destructor, deleting the object if desired. Again, this
11705 is only meaningful for [cd]tors, since they are the only functions where
11706 there is a significant distinction between the main body and any
11707 function catch clauses. Handling, say, main() return semantics here
11708 would be wrong, as flowing off the end of a function catch clause for
11709 main() would also need to return 0. */
11712 finish_function_body (tree compstmt)
11714 if (compstmt == NULL_TREE)
11717 /* Close the block. */
11718 finish_compound_stmt (compstmt);
11720 if (processing_template_decl)
11721 /* Do nothing now. */;
11722 else if (DECL_CONSTRUCTOR_P (current_function_decl))
11723 finish_constructor_body ();
11724 else if (DECL_DESTRUCTOR_P (current_function_decl))
11725 finish_destructor_body ();
11728 /* Given a function, returns the BLOCK corresponding to the outermost level
11729 of curly braces, skipping the artificial block created for constructor
11733 outer_curly_brace_block (tree fndecl)
11735 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
11736 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
11737 /* Skip the artificial function body block. */
11738 block = BLOCK_SUBBLOCKS (block);
11742 /* Finish up a function declaration and compile that function
11743 all the way to assembler language output. The free the storage
11744 for the function definition.
11746 FLAGS is a bitwise or of the following values:
11748 We just finished processing the body of an in-class inline
11749 function definition. (This processing will have taken place
11750 after the class definition is complete.) */
11753 finish_function (int flags)
11755 tree fndecl = current_function_decl;
11756 tree fntype, ctype = NULL_TREE;
11757 int inclass_inline = (flags & 2) != 0;
11760 /* When we get some parse errors, we can end up without a
11761 current_function_decl, so cope. */
11762 if (fndecl == NULL_TREE)
11763 return error_mark_node;
11765 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
11766 && DECL_VIRTUAL_P (fndecl)
11767 && !processing_template_decl)
11769 tree fnclass = DECL_CONTEXT (fndecl);
11770 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
11771 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
11774 nested = function_depth > 1;
11775 fntype = TREE_TYPE (fndecl);
11777 /* TREE_READONLY (fndecl) = 1;
11778 This caused &foo to be of type ptr-to-const-function
11779 which then got a warning when stored in a ptr-to-function variable. */
11781 gcc_assert (building_stmt_tree ());
11782 /* The current function is being defined, so its DECL_INITIAL should
11783 be set, and unless there's a multiple definition, it should be
11784 error_mark_node. */
11785 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
11787 /* For a cloned function, we've already got all the code we need;
11788 there's no need to add any extra bits. */
11789 if (!DECL_CLONED_FUNCTION_P (fndecl))
11791 if (DECL_MAIN_P (current_function_decl))
11795 /* Make it so that `main' always returns 0 by default (or
11798 stmt = finish_return_stmt (integer_one_node);
11800 stmt = finish_return_stmt (integer_zero_node);
11802 /* Hack. We don't want the middle-end to warn that this
11803 return is unreachable, so put the statement on the
11806 location_t linezero = linemap_line_start (line_table, 0, 1);
11807 SET_EXPR_LOCATION (stmt, linezero);
11811 if (use_eh_spec_block (current_function_decl))
11812 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
11813 (TREE_TYPE (current_function_decl)),
11814 current_eh_spec_block);
11817 /* If we're saving up tree structure, tie off the function now. */
11818 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
11820 finish_fname_decls ();
11822 /* If this function can't throw any exceptions, remember that. */
11823 if (!processing_template_decl
11824 && !cp_function_chain->can_throw
11825 && !flag_non_call_exceptions
11826 && !DECL_REPLACEABLE_P (fndecl))
11827 TREE_NOTHROW (fndecl) = 1;
11829 /* This must come after expand_function_end because cleanups might
11830 have declarations (from inline functions) that need to go into
11831 this function's blocks. */
11833 /* If the current binding level isn't the outermost binding level
11834 for this function, either there is a bug, or we have experienced
11835 syntax errors and the statement tree is malformed. */
11836 if (current_binding_level->kind != sk_function_parms)
11838 /* Make sure we have already experienced errors. */
11839 gcc_assert (errorcount);
11841 /* Throw away the broken statement tree and extra binding
11843 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
11845 while (current_binding_level->kind != sk_function_parms)
11847 if (current_binding_level->kind == sk_class)
11848 pop_nested_class ();
11850 poplevel (0, 0, 0);
11853 poplevel (1, 0, 1);
11855 /* Statements should always be full-expressions at the outermost set
11856 of curly braces for a function. */
11857 gcc_assert (stmts_are_full_exprs_p ());
11859 /* Set up the named return value optimization, if we can. Candidate
11860 variables are selected in check_return_expr. */
11861 if (current_function_return_value)
11863 tree r = current_function_return_value;
11866 if (r != error_mark_node
11867 /* This is only worth doing for fns that return in memory--and
11868 simpler, since we don't have to worry about promoted modes. */
11869 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
11870 /* Only allow this for variables declared in the outer scope of
11871 the function so we know that their lifetime always ends with a
11872 return; see g++.dg/opt/nrv6.C. We could be more flexible if
11873 we were to do this optimization in tree-ssa. */
11874 && (outer = outer_curly_brace_block (fndecl))
11875 && chain_member (r, BLOCK_VARS (outer)))
11876 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
11878 current_function_return_value = NULL_TREE;
11881 /* Remember that we were in class scope. */
11882 if (current_class_name)
11883 ctype = current_class_type;
11885 /* Must mark the RESULT_DECL as being in this function. */
11886 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
11888 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
11889 to the FUNCTION_DECL node itself. */
11890 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
11892 /* Save away current state, if appropriate. */
11893 if (!processing_template_decl)
11894 save_function_data (fndecl);
11896 /* Complain if there's just no return statement. */
11897 if (warn_return_type
11898 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
11899 && !dependent_type_p (TREE_TYPE (fntype))
11900 && !current_function_returns_value && !current_function_returns_null
11901 /* Don't complain if we abort or throw. */
11902 && !current_function_returns_abnormally
11903 && !DECL_NAME (DECL_RESULT (fndecl))
11904 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
11905 inline function, as we might never be compiled separately. */
11906 && (DECL_INLINE (fndecl) || processing_template_decl)
11907 /* Structor return values (if any) are set by the compiler. */
11908 && !DECL_CONSTRUCTOR_P (fndecl)
11909 && !DECL_DESTRUCTOR_P (fndecl))
11910 warning (OPT_Wreturn_type, "no return statement in function returning non-void");
11912 /* Store the end of the function, so that we get good line number
11913 info for the epilogue. */
11914 cfun->function_end_locus = input_location;
11916 /* Genericize before inlining. */
11917 if (!processing_template_decl)
11919 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
11920 cp_genericize (fndecl);
11921 /* Clear out the bits we don't need. */
11922 f->x_current_class_ptr = NULL;
11923 f->x_current_class_ref = NULL;
11924 f->x_eh_spec_block = NULL;
11925 f->x_in_charge_parm = NULL;
11926 f->x_vtt_parm = NULL;
11927 f->x_return_value = NULL;
11928 f->bindings = NULL;
11929 f->extern_decl_map = NULL;
11931 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
11932 c_warn_unused_result (&DECL_SAVED_TREE (fndecl));
11934 /* Clear out the bits we don't need. */
11935 local_names = NULL;
11937 /* We're leaving the context of this function, so zap cfun. It's still in
11938 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
11940 current_function_decl = NULL;
11942 /* If this is an in-class inline definition, we may have to pop the
11943 bindings for the template parameters that we added in
11944 maybe_begin_member_template_processing when start_function was
11946 if (inclass_inline)
11947 maybe_end_member_template_processing ();
11949 /* Leave the scope of the class. */
11951 pop_nested_class ();
11957 /* Let the error reporting routines know that we're outside a
11958 function. For a nested function, this value is used in
11959 cxx_pop_function_context and then reset via pop_function_context. */
11960 current_function_decl = NULL_TREE;
11965 /* Create the FUNCTION_DECL for a function definition.
11966 DECLSPECS and DECLARATOR are the parts of the declaration;
11967 they describe the return type and the name of the function,
11968 but twisted together in a fashion that parallels the syntax of C.
11970 This function creates a binding context for the function body
11971 as well as setting up the FUNCTION_DECL in current_function_decl.
11973 Returns a FUNCTION_DECL on success.
11975 If the DECLARATOR is not suitable for a function (it defines a datum
11976 instead), we return 0, which tells yyparse to report a parse error.
11978 May return void_type_node indicating that this method is actually
11979 a friend. See grokfield for more details.
11981 Came here with a `.pushlevel' .
11983 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
11984 CHANGES TO CODE IN `grokfield'. */
11987 start_method (cp_decl_specifier_seq *declspecs,
11988 const cp_declarator *declarator, tree attrlist)
11990 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
11993 if (fndecl == error_mark_node)
11994 return error_mark_node;
11996 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
11998 error ("invalid member function declaration");
11999 return error_mark_node;
12003 cplus_decl_attributes (&fndecl, attrlist, 0);
12005 /* Pass friends other than inline friend functions back. */
12006 if (fndecl == void_type_node)
12009 if (DECL_IN_AGGR_P (fndecl))
12011 if (DECL_CONTEXT (fndecl)
12012 && TREE_CODE (DECL_CONTEXT (fndecl)) != NAMESPACE_DECL)
12013 error ("%qD is already defined in class %qT", fndecl,
12014 DECL_CONTEXT (fndecl));
12015 return error_mark_node;
12018 check_template_shadow (fndecl);
12020 DECL_DECLARED_INLINE_P (fndecl) = 1;
12021 if (flag_default_inline)
12022 DECL_INLINE (fndecl) = 1;
12024 /* We process method specializations in finish_struct_1. */
12025 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
12027 fndecl = push_template_decl (fndecl);
12028 if (fndecl == error_mark_node)
12032 if (! DECL_FRIEND_P (fndecl))
12034 if (TREE_CHAIN (fndecl))
12036 fndecl = copy_node (fndecl);
12037 TREE_CHAIN (fndecl) = NULL_TREE;
12041 finish_decl (fndecl, NULL_TREE, NULL_TREE);
12043 /* Make a place for the parms. */
12044 begin_scope (sk_function_parms, fndecl);
12046 DECL_IN_AGGR_P (fndecl) = 1;
12050 /* Go through the motions of finishing a function definition.
12051 We don't compile this method until after the whole class has
12054 FINISH_METHOD must return something that looks as though it
12055 came from GROKFIELD (since we are defining a method, after all).
12057 This is called after parsing the body of the function definition.
12058 STMTS is the chain of statements that makes up the function body.
12060 DECL is the ..._DECL that `start_method' provided. */
12063 finish_method (tree decl)
12065 tree fndecl = decl;
12070 if (decl == void_type_node)
12073 old_initial = DECL_INITIAL (fndecl);
12075 /* Undo the level for the parms (from start_method).
12076 This is like poplevel, but it causes nothing to be
12077 saved. Saving information here confuses symbol-table
12078 output routines. Besides, this information will
12079 be correctly output when this method is actually
12082 /* Clear out the meanings of the local variables of this level;
12083 also record in each decl which block it belongs to. */
12085 for (link = current_binding_level->names; link; link = TREE_CHAIN (link))
12087 if (DECL_NAME (link) != NULL_TREE)
12088 pop_binding (DECL_NAME (link), link);
12089 gcc_assert (TREE_CODE (link) != FUNCTION_DECL);
12090 DECL_CONTEXT (link) = NULL_TREE;
12093 poplevel (0, 0, 0);
12095 DECL_INITIAL (fndecl) = old_initial;
12097 /* We used to check if the context of FNDECL was different from
12098 current_class_type as another way to get inside here. This didn't work
12099 for String.cc in libg++. */
12100 if (DECL_FRIEND_P (fndecl))
12102 VEC_safe_push (tree, gc, CLASSTYPE_INLINE_FRIENDS (current_class_type),
12104 decl = void_type_node;
12111 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
12112 we can lay it out later, when and if its type becomes complete. */
12115 maybe_register_incomplete_var (tree var)
12117 gcc_assert (TREE_CODE (var) == VAR_DECL);
12119 /* Keep track of variables with incomplete types. */
12120 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
12121 && DECL_EXTERNAL (var))
12123 tree inner_type = TREE_TYPE (var);
12125 while (TREE_CODE (inner_type) == ARRAY_TYPE)
12126 inner_type = TREE_TYPE (inner_type);
12127 inner_type = TYPE_MAIN_VARIANT (inner_type);
12129 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
12130 /* RTTI TD entries are created while defining the type_info. */
12131 || (TYPE_LANG_SPECIFIC (inner_type)
12132 && TYPE_BEING_DEFINED (inner_type)))
12133 incomplete_vars = tree_cons (inner_type, var, incomplete_vars);
12137 /* Called when a class type (given by TYPE) is defined. If there are
12138 any existing VAR_DECLs whose type hsa been completed by this
12139 declaration, update them now. */
12142 complete_vars (tree type)
12144 tree *list = &incomplete_vars;
12146 gcc_assert (CLASS_TYPE_P (type));
12149 if (same_type_p (type, TREE_PURPOSE (*list)))
12151 tree var = TREE_VALUE (*list);
12152 tree type = TREE_TYPE (var);
12153 /* Complete the type of the variable. The VAR_DECL itself
12154 will be laid out in expand_expr. */
12155 complete_type (type);
12156 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
12157 /* Remove this entry from the list. */
12158 *list = TREE_CHAIN (*list);
12161 list = &TREE_CHAIN (*list);
12164 /* Check for pending declarations which may have abstract type. */
12165 complete_type_check_abstract (type);
12168 /* If DECL is of a type which needs a cleanup, build and return an
12169 expression to perform that cleanup here. Return NULL_TREE if no
12170 cleanup need be done. */
12173 cxx_maybe_build_cleanup (tree decl)
12179 /* Assume no cleanup is required. */
12180 cleanup = NULL_TREE;
12182 if (error_operand_p (decl))
12185 /* Handle "__attribute__((cleanup))". We run the cleanup function
12186 before the destructor since the destructor is what actually
12187 terminates the lifetime of the object. */
12188 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
12195 /* Get the name specified by the user for the cleanup function. */
12196 id = TREE_VALUE (TREE_VALUE (attr));
12197 /* Look up the name to find the cleanup function to call. It is
12198 important to use lookup_name here because that is what is
12199 used in c-common.c:handle_cleanup_attribute when performing
12200 initial checks on the attribute. Note that those checks
12201 include ensuring that the function found is not an overloaded
12202 function, or an object with an overloaded call operator,
12203 etc.; we can rely on the fact that the functionfound is an
12204 ordinary FUNCTION_DECL. */
12205 fn = lookup_name (id);
12206 arg = build_address (decl);
12208 cleanup = build_function_call (fn, build_tree_list (NULL_TREE,
12211 /* Handle ordinary C++ destructors. */
12212 type = TREE_TYPE (decl);
12213 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
12215 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
12216 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
12217 && CLASSTYPE_VBASECLASSES (type));
12221 if (TREE_CODE (type) == ARRAY_TYPE)
12224 addr = build_address (decl);
12226 /* Optimize for space over speed here. */
12227 if (!has_vbases || flag_expensive_optimizations)
12228 flags |= LOOKUP_NONVIRTUAL;
12230 call = build_delete (TREE_TYPE (addr), addr,
12231 sfk_complete_destructor, flags, 0);
12233 cleanup = build_compound_expr (cleanup, call);
12241 /* When a stmt has been parsed, this function is called. */
12248 /* DECL was originally constructed as a non-static member function,
12249 but turned out to be static. Update it accordingly. */
12252 revert_static_member_fn (tree decl)
12255 tree function = TREE_TYPE (decl);
12256 tree args = TYPE_ARG_TYPES (function);
12258 if (cp_type_quals (TREE_TYPE (TREE_VALUE (args)))
12259 != TYPE_UNQUALIFIED)
12260 error ("static member function %q#D declared with type qualifiers", decl);
12262 args = TREE_CHAIN (args);
12263 tmp = build_function_type (TREE_TYPE (function), args);
12264 tmp = build_qualified_type (tmp, cp_type_quals (function));
12265 tmp = build_exception_variant (tmp,
12266 TYPE_RAISES_EXCEPTIONS (function));
12267 TREE_TYPE (decl) = tmp;
12268 if (DECL_ARGUMENTS (decl))
12269 DECL_ARGUMENTS (decl) = TREE_CHAIN (DECL_ARGUMENTS (decl));
12270 DECL_STATIC_FUNCTION_P (decl) = 1;
12273 /* Initialize the variables used during compilation of a C++
12277 cxx_push_function_context (struct function * f)
12279 struct language_function *p = GGC_CNEW (struct language_function);
12282 /* Whenever we start a new function, we destroy temporaries in the
12284 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
12290 if (DECL_SAVED_FUNCTION_DATA (fn))
12292 /* If we already parsed this function, and we're just expanding it
12293 now, restore saved state. */
12294 *cp_function_chain = *DECL_SAVED_FUNCTION_DATA (fn);
12296 /* We don't need the saved data anymore. Unless this is an inline
12297 function; we need the named return value info for
12298 declare_return_variable. */
12299 if (! DECL_INLINE (fn))
12300 DECL_SAVED_FUNCTION_DATA (fn) = NULL;
12305 /* Free the language-specific parts of F, now that we've finished
12306 compiling the function. */
12309 cxx_pop_function_context (struct function * f)
12314 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
12315 one of the language-independent trees. */
12317 enum cp_tree_node_structure_enum
12318 cp_tree_node_structure (union lang_tree_node * t)
12320 switch (TREE_CODE (&t->generic))
12322 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
12323 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
12324 case OVERLOAD: return TS_CP_OVERLOAD;
12325 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
12326 case PTRMEM_CST: return TS_CP_PTRMEM;
12327 case BASELINK: return TS_CP_BASELINK;
12328 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
12329 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
12330 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
12331 default: return TS_CP_GENERIC;
12335 /* Build the void_list_node (void_type_node having been created). */
12337 build_void_list_node (void)
12339 tree t = build_tree_list (NULL_TREE, void_type_node);
12344 cp_missing_noreturn_ok_p (tree decl)
12346 /* A missing noreturn is ok for the `main' function. */
12347 return DECL_MAIN_P (decl);
12350 /* Return the COMDAT group into which DECL should be placed. */
12353 cxx_comdat_group (tree decl)
12357 /* Virtual tables, construction virtual tables, and virtual table
12358 tables all go in a single COMDAT group, named after the primary
12360 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
12361 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
12362 /* For all other DECLs, the COMDAT group is the mangled name of the
12363 declaration itself. */
12366 while (DECL_THUNK_P (decl))
12368 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
12369 into the same section as the target function. In that case
12370 we must return target's name. */
12371 tree target = THUNK_TARGET (decl);
12372 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
12373 && DECL_SECTION_NAME (target) != NULL
12374 && DECL_ONE_ONLY (target))
12379 name = DECL_ASSEMBLER_NAME (decl);
12382 return IDENTIFIER_POINTER (name);
12385 #include "gt-cp-decl.h"