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 Free Software Foundation, Inc.
4 Contributed by Michael Tiemann (tiemann@cygnus.com)
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2, or (at your option)
13 GCC is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING. If not, write to
20 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
21 Boston, MA 02110-1301, USA. */
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"
53 #include "tree-flow.h"
55 static tree grokparms (cp_parameter_declarator *, tree *);
56 static const char *redeclaration_error_message (tree, tree);
58 static int decl_jump_unsafe (tree);
59 static void require_complete_types_for_parms (tree);
60 static int ambi_op_p (enum tree_code);
61 static int unary_op_p (enum tree_code);
62 static void push_local_name (tree);
63 static tree grok_reference_init (tree, tree, tree, tree *);
64 static tree grokvardecl (tree, tree, const cp_decl_specifier_seq *,
66 static void record_unknown_type (tree, const char *);
67 static tree builtin_function_1 (const char *, tree, tree,
68 enum built_in_function code,
69 enum built_in_class cl, const char *,
71 static tree build_library_fn_1 (tree, enum tree_code, tree);
72 static int member_function_or_else (tree, tree, enum overload_flags);
73 static void bad_specifiers (tree, const char *, int, int, int, int,
75 static void check_for_uninitialized_const_var (tree);
76 static hashval_t typename_hash (const void *);
77 static int typename_compare (const void *, const void *);
78 static tree local_variable_p_walkfn (tree *, int *, void *);
79 static tree record_builtin_java_type (const char *, int);
80 static const char *tag_name (enum tag_types);
81 static tree lookup_and_check_tag (enum tag_types, tree, tag_scope, bool);
82 static int walk_namespaces_r (tree, walk_namespaces_fn, void *);
83 static tree make_label_decl (tree, int);
84 static void use_label (tree);
85 static void check_previous_goto_1 (tree, struct cp_binding_level *, tree,
87 static void check_previous_goto (struct named_label_use_list *);
88 static void check_switch_goto (struct cp_binding_level *);
89 static void check_previous_gotos (tree);
90 static void pop_label (tree, tree);
91 static void pop_labels (tree);
92 static void maybe_deduce_size_from_array_init (tree, tree);
93 static void layout_var_decl (tree);
94 static void maybe_commonize_var (tree);
95 static tree check_initializer (tree, tree, int, tree *);
96 static void make_rtl_for_nonlocal_decl (tree, tree, const char *);
97 static void save_function_data (tree);
98 static void check_function_type (tree, tree);
99 static void finish_constructor_body (void);
100 static void begin_destructor_body (void);
101 static void finish_destructor_body (void);
102 static tree create_array_type_for_decl (tree, tree, tree);
103 static tree get_atexit_node (void);
104 static tree get_dso_handle_node (void);
105 static tree start_cleanup_fn (void);
106 static void end_cleanup_fn (void);
107 static tree cp_make_fname_decl (tree, int);
108 static void initialize_predefined_identifiers (void);
109 static tree check_special_function_return_type
110 (special_function_kind, tree, tree);
111 static tree push_cp_library_fn (enum tree_code, tree);
112 static tree build_cp_library_fn (tree, enum tree_code, tree);
113 static void store_parm_decls (tree);
114 static void initialize_local_var (tree, tree);
115 static void expand_static_init (tree, tree);
116 static tree next_initializable_field (tree);
117 static tree reshape_init (tree, tree);
119 /* Erroneous argument lists can use this *IFF* they do not modify it. */
120 tree error_mark_list;
122 /* The following symbols are subsumed in the cp_global_trees array, and
123 listed here individually for documentation purposes.
126 tree wchar_decl_node;
128 tree vtable_entry_type;
129 tree delta_type_node;
130 tree __t_desc_type_node;
132 tree class_type_node;
133 tree unknown_type_node;
135 Array type `vtable_entry_type[]'
138 tree vtbl_ptr_type_node;
145 A FUNCTION_DECL which can call `abort'. Not necessarily the
146 one that the user will declare, but sufficient to be called
147 by routines that want to abort the program.
151 The FUNCTION_DECL for the default `::operator delete'.
153 tree global_delete_fndecl;
156 tree type_info_type_node, tinfo_decl_id, tinfo_decl_type;
161 tree cp_global_trees[CPTI_MAX];
163 /* Indicates that there is a type value in some namespace, although
164 that is not necessarily in scope at the moment. */
166 tree global_type_node;
168 /* The node that holds the "name" of the global scope. */
169 tree global_scope_name;
171 /* Used only for jumps to as-yet undefined labels, since jumps to
172 defined labels can have their validity checked immediately. */
174 struct named_label_use_list GTY(())
176 struct cp_binding_level *binding_level;
179 location_t o_goto_locus;
180 struct named_label_use_list *next;
183 #define named_label_uses cp_function_chain->x_named_label_uses
185 #define local_names cp_function_chain->x_local_names
187 /* A list of objects which have constructors or destructors
188 which reside in the global scope. The decl is stored in
189 the TREE_VALUE slot and the initializer is stored
190 in the TREE_PURPOSE slot. */
191 tree static_aggregates;
195 /* A node for the integer constants 2, and 3. */
197 tree integer_two_node, integer_three_node;
199 /* A list of all LABEL_DECLs in the function that have names. Here so
200 we can clear out their names' definitions at the end of the
201 function, and so we can check the validity of jumps to these labels. */
203 struct named_label_list GTY(())
205 struct cp_binding_level *binding_level;
210 struct named_label_list *next;
211 unsigned int in_try_scope : 1;
212 unsigned int in_catch_scope : 1;
215 #define named_labels cp_function_chain->x_named_labels
217 /* The number of function bodies which we are currently processing.
218 (Zero if we are at namespace scope, one inside the body of a
219 function, two inside the body of a function in a local class, etc.) */
222 /* States indicating how grokdeclarator() should handle declspecs marked
223 with __attribute__((deprecated)). An object declared as
224 __attribute__((deprecated)) suppresses warnings of uses of other
227 enum deprecated_states {
232 static enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
234 /* True if a declaration with an `extern' linkage specifier is being
236 bool have_extern_spec;
239 /* A TREE_LIST of VAR_DECLs. The TREE_PURPOSE is a RECORD_TYPE or
240 UNION_TYPE; the TREE_VALUE is a VAR_DECL with that type. At the
241 time the VAR_DECL was declared, the type was incomplete. */
243 static GTY(()) tree incomplete_vars;
245 /* Returns the kind of template specialization we are currently
246 processing, given that it's declaration contained N_CLASS_SCOPES
247 explicit scope qualifications. */
250 current_tmpl_spec_kind (int n_class_scopes)
252 int n_template_parm_scopes = 0;
253 int seen_specialization_p = 0;
254 int innermost_specialization_p = 0;
255 struct cp_binding_level *b;
257 /* Scan through the template parameter scopes. */
258 for (b = current_binding_level;
259 b->kind == sk_template_parms;
262 /* If we see a specialization scope inside a parameter scope,
263 then something is wrong. That corresponds to a declaration
266 template <class T> template <> ...
268 which is always invalid since [temp.expl.spec] forbids the
269 specialization of a class member template if the enclosing
270 class templates are not explicitly specialized as well. */
271 if (b->explicit_spec_p)
273 if (n_template_parm_scopes == 0)
274 innermost_specialization_p = 1;
276 seen_specialization_p = 1;
278 else if (seen_specialization_p == 1)
279 return tsk_invalid_member_spec;
281 ++n_template_parm_scopes;
284 /* Handle explicit instantiations. */
285 if (processing_explicit_instantiation)
287 if (n_template_parm_scopes != 0)
288 /* We've seen a template parameter list during an explicit
289 instantiation. For example:
291 template <class T> template void f(int);
293 This is erroneous. */
294 return tsk_invalid_expl_inst;
296 return tsk_expl_inst;
299 if (n_template_parm_scopes < n_class_scopes)
300 /* We've not seen enough template headers to match all the
301 specialized classes present. For example:
303 template <class T> void R<T>::S<T>::f(int);
305 This is invalid; there needs to be one set of template
306 parameters for each class. */
307 return tsk_insufficient_parms;
308 else if (n_template_parm_scopes == n_class_scopes)
309 /* We're processing a non-template declaration (even though it may
310 be a member of a template class.) For example:
312 template <class T> void S<T>::f(int);
314 The `class T' maches the `S<T>', leaving no template headers
315 corresponding to the `f'. */
317 else if (n_template_parm_scopes > n_class_scopes + 1)
318 /* We've got too many template headers. For example:
320 template <> template <class T> void f (T);
322 There need to be more enclosing classes. */
323 return tsk_excessive_parms;
325 /* This must be a template. It's of the form:
327 template <class T> template <class U> void S<T>::f(U);
329 This is a specialization if the innermost level was a
330 specialization; otherwise it's just a definition of the
332 return innermost_specialization_p ? tsk_expl_spec : tsk_template;
335 /* Exit the current scope. */
343 /* When a label goes out of scope, check to see if that label was used
344 in a valid manner, and issue any appropriate warnings or errors. */
347 pop_label (tree label, tree old_value)
349 if (!processing_template_decl)
351 if (DECL_INITIAL (label) == NULL_TREE)
355 error ("label %q+D used but not defined", label);
356 #ifdef USE_MAPPED_LOCATION
357 location = input_location; /* FIXME want (input_filename, (line)0) */
359 location.file = input_filename;
362 /* Avoid crashing later. */
363 define_label (location, DECL_NAME (label));
365 else if (warn_unused_label && !TREE_USED (label))
366 warning (0, "label %q+D defined but not used", label);
369 SET_IDENTIFIER_LABEL_VALUE (DECL_NAME (label), old_value);
372 /* At the end of a function, all labels declared within the function
373 go out of scope. BLOCK is the top-level block for the
377 pop_labels (tree block)
379 struct named_label_list *link;
381 /* Clear out the definitions of all label names, since their scopes
383 for (link = named_labels; link; link = link->next)
385 pop_label (link->label_decl, link->old_value);
386 /* Put the labels into the "variables" of the top-level block,
387 so debugger can see them. */
388 TREE_CHAIN (link->label_decl) = BLOCK_VARS (block);
389 BLOCK_VARS (block) = link->label_decl;
395 /* The following two routines are used to interface to Objective-C++.
396 The binding level is purposely treated as an opaque type. */
399 objc_get_current_scope (void)
401 return current_binding_level;
404 /* The following routine is used by the NeXT-style SJLJ exceptions;
405 variables get marked 'volatile' so as to not be clobbered by
406 _setjmp()/_longjmp() calls. All variables in the current scope,
407 as well as parent scopes up to (but not including) ENCLOSING_BLK
408 shall be thusly marked. */
411 objc_mark_locals_volatile (void *enclosing_blk)
413 struct cp_binding_level *scope;
415 for (scope = current_binding_level;
416 scope && scope != enclosing_blk;
417 scope = scope->level_chain)
421 for (decl = scope->names; decl; decl = TREE_CHAIN (decl))
422 objc_volatilize_decl (decl);
424 /* Do not climb up past the current function. */
425 if (scope->kind == sk_function_parms)
430 /* Exit a binding level.
431 Pop the level off, and restore the state of the identifier-decl mappings
432 that were in effect when this level was entered.
434 If KEEP == 1, this level had explicit declarations, so
435 and create a "block" (a BLOCK node) for the level
436 to record its declarations and subblocks for symbol table output.
438 If FUNCTIONBODY is nonzero, this level is the body of a function,
439 so create a block as if KEEP were set and also clear out all
442 If REVERSE is nonzero, reverse the order of decls before putting
443 them into the BLOCK. */
446 poplevel (int keep, int reverse, int functionbody)
449 /* The chain of decls was accumulated in reverse order.
450 Put it into forward order, just for cleanliness. */
452 int tmp = functionbody;
453 int real_functionbody;
457 int leaving_for_scope;
460 timevar_push (TV_NAME_LOOKUP);
465 gcc_assert (current_binding_level->kind != sk_class);
467 real_functionbody = (current_binding_level->kind == sk_cleanup
468 ? ((functionbody = 0), tmp) : functionbody);
469 subblocks = functionbody >= 0 ? current_binding_level->blocks : 0;
471 gcc_assert (!VEC_length(cp_class_binding,
472 current_binding_level->class_shadowed));
474 /* We used to use KEEP == 2 to indicate that the new block should go
475 at the beginning of the list of blocks at this binding level,
476 rather than the end. This hack is no longer used. */
477 gcc_assert (keep == 0 || keep == 1);
479 if (current_binding_level->keep)
482 /* Any uses of undefined labels, and any defined labels, now operate
483 under constraints of next binding contour. */
484 if (cfun && !functionbody)
486 struct cp_binding_level *level_chain;
487 level_chain = current_binding_level->level_chain;
490 struct named_label_use_list *uses;
491 struct named_label_list *labels;
492 for (labels = named_labels; labels; labels = labels->next)
493 if (labels->binding_level == current_binding_level)
496 if (current_binding_level->kind == sk_try)
497 labels->in_try_scope = 1;
498 if (current_binding_level->kind == sk_catch)
499 labels->in_catch_scope = 1;
500 for (decl = labels->names_in_scope; decl;
501 decl = TREE_CHAIN (decl))
502 if (decl_jump_unsafe (decl))
503 labels->bad_decls = tree_cons (NULL_TREE, decl,
505 labels->binding_level = level_chain;
506 labels->names_in_scope = level_chain->names;
509 for (uses = named_label_uses; uses; uses = uses->next)
510 if (uses->binding_level == current_binding_level)
512 uses->binding_level = level_chain;
513 uses->names_in_scope = level_chain->names;
518 /* Get the decls in the order they were written.
519 Usually current_binding_level->names is in reverse order.
520 But parameter decls were previously put in forward order. */
523 current_binding_level->names
524 = decls = nreverse (current_binding_level->names);
526 decls = current_binding_level->names;
528 /* If there were any declarations or structure tags in that level,
529 or if this level is a function body,
530 create a BLOCK to record them for the life of this function. */
532 if (keep == 1 || functionbody)
533 block = make_node (BLOCK);
534 if (block != NULL_TREE)
536 BLOCK_VARS (block) = decls;
537 BLOCK_SUBBLOCKS (block) = subblocks;
540 /* In each subblock, record that this is its superior. */
542 for (link = subblocks; link; link = TREE_CHAIN (link))
543 BLOCK_SUPERCONTEXT (link) = block;
545 /* We still support the old for-scope rules, whereby the variables
546 in a for-init statement were in scope after the for-statement
547 ended. We only use the new rules if flag_new_for_scope is
550 = current_binding_level->kind == sk_for && flag_new_for_scope == 1;
552 /* Before we remove the declarations first check for unused variables. */
553 if (warn_unused_variable
554 && !processing_template_decl)
555 for (decl = getdecls (); decl; decl = TREE_CHAIN (decl))
556 if (TREE_CODE (decl) == VAR_DECL
557 && ! TREE_USED (decl)
558 && ! DECL_IN_SYSTEM_HEADER (decl)
559 && DECL_NAME (decl) && ! DECL_ARTIFICIAL (decl))
560 warning (0, "unused variable %q+D", decl);
562 /* Remove declarations for all the DECLs in this level. */
563 for (link = decls; link; link = TREE_CHAIN (link))
565 if (leaving_for_scope && TREE_CODE (link) == VAR_DECL
568 tree name = DECL_NAME (link);
572 ob = outer_binding (name,
573 IDENTIFIER_BINDING (name),
576 ns_binding = IDENTIFIER_NAMESPACE_VALUE (name);
578 ns_binding = NULL_TREE;
580 if (ob && ob->scope == current_binding_level->level_chain)
581 /* We have something like:
586 and we are leaving the `for' scope. There's no reason to
587 keep the binding of the inner `i' in this case. */
588 pop_binding (name, link);
589 else if ((ob && (TREE_CODE (ob->value) == TYPE_DECL))
590 || (ns_binding && TREE_CODE (ns_binding) == TYPE_DECL))
591 /* Here, we have something like:
599 We must pop the for-scope binding so we know what's a
600 type and what isn't. */
601 pop_binding (name, link);
604 /* Mark this VAR_DECL as dead so that we can tell we left it
605 there only for backward compatibility. */
606 DECL_DEAD_FOR_LOCAL (link) = 1;
608 /* Keep track of what should have happened when we
609 popped the binding. */
612 SET_DECL_SHADOWED_FOR_VAR (link, ob->value);
613 DECL_HAS_SHADOWED_FOR_VAR_P (link) = 1;
616 /* Add it to the list of dead variables in the next
617 outermost binding to that we can remove these when we
618 leave that binding. */
619 current_binding_level->level_chain->dead_vars_from_for
620 = tree_cons (NULL_TREE, link,
621 current_binding_level->level_chain->
624 /* Although we don't pop the cxx_binding, we do clear
625 its SCOPE since the scope is going away now. */
626 IDENTIFIER_BINDING (name)->scope
627 = current_binding_level->level_chain;
634 /* Remove the binding. */
637 if (TREE_CODE (decl) == TREE_LIST)
638 decl = TREE_VALUE (decl);
641 if (TREE_CODE (name) == OVERLOAD)
642 name = OVL_FUNCTION (name);
644 gcc_assert (DECL_P (name));
645 pop_binding (DECL_NAME (name), decl);
649 /* Remove declarations for any `for' variables from inner scopes
650 that we kept around. */
651 for (link = current_binding_level->dead_vars_from_for;
652 link; link = TREE_CHAIN (link))
653 pop_binding (DECL_NAME (TREE_VALUE (link)), TREE_VALUE (link));
655 /* Restore the IDENTIFIER_TYPE_VALUEs. */
656 for (link = current_binding_level->type_shadowed;
657 link; link = TREE_CHAIN (link))
658 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (link), TREE_VALUE (link));
660 /* Restore the IDENTIFIER_LABEL_VALUEs for local labels. */
661 for (link = current_binding_level->shadowed_labels;
663 link = TREE_CHAIN (link))
664 pop_label (TREE_VALUE (link), TREE_PURPOSE (link));
666 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
667 list if a `using' declaration put them there. The debugging
668 back-ends won't understand OVERLOAD, so we remove them here.
669 Because the BLOCK_VARS are (temporarily) shared with
670 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
671 popped all the bindings. */
676 for (d = &BLOCK_VARS (block); *d; )
678 if (TREE_CODE (*d) == TREE_LIST)
679 *d = TREE_CHAIN (*d);
681 d = &TREE_CHAIN (*d);
685 /* If the level being exited is the top level of a function,
686 check over all the labels. */
689 /* Since this is the top level block of a function, the vars are
690 the function's parameters. Don't leave them in the BLOCK
691 because they are found in the FUNCTION_DECL instead. */
692 BLOCK_VARS (block) = 0;
696 kind = current_binding_level->kind;
697 if (kind == sk_cleanup)
701 /* If this is a temporary binding created for a cleanup, then we'll
702 have pushed a statement list level. Pop that, create a new
703 BIND_EXPR for the block, and insert it into the stream. */
704 stmt = pop_stmt_list (current_binding_level->statement_list);
705 stmt = c_build_bind_expr (block, stmt);
711 DECL_INITIAL (current_function_decl) = block;
713 current_binding_level->blocks
714 = chainon (current_binding_level->blocks, block);
716 /* If we did not make a block for the level just exited,
717 any blocks made for inner levels
718 (since they cannot be recorded as subblocks in that level)
719 must be carried forward so they will later become subblocks
720 of something else. */
722 current_binding_level->blocks
723 = chainon (current_binding_level->blocks, subblocks);
725 /* Each and every BLOCK node created here in `poplevel' is important
726 (e.g. for proper debugging information) so if we created one
727 earlier, mark it as "used". */
729 TREE_USED (block) = 1;
731 /* All temporary bindings created for cleanups are popped silently. */
732 if (kind == sk_cleanup)
735 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, block);
738 /* Insert BLOCK at the end of the list of subblocks of the
739 current binding level. This is used when a BIND_EXPR is expanded,
740 to handle the BLOCK node inside the BIND_EXPR. */
743 insert_block (tree block)
745 TREE_USED (block) = 1;
746 current_binding_level->blocks
747 = chainon (current_binding_level->blocks, block);
750 /* Walk all the namespaces contained NAMESPACE, including NAMESPACE
751 itself, calling F for each. The DATA is passed to F as well. */
754 walk_namespaces_r (tree namespace, walk_namespaces_fn f, void* data)
757 tree current = NAMESPACE_LEVEL (namespace)->namespaces;
759 result |= (*f) (namespace, data);
761 for (; current; current = TREE_CHAIN (current))
762 result |= walk_namespaces_r (current, f, data);
767 /* Walk all the namespaces, calling F for each. The DATA is passed to
771 walk_namespaces (walk_namespaces_fn f, void* data)
773 return walk_namespaces_r (global_namespace, f, data);
776 /* Call wrapup_globals_declarations for the globals in NAMESPACE. If
777 DATA is non-NULL, this is the last time we will call
778 wrapup_global_declarations for this NAMESPACE. */
781 wrapup_globals_for_namespace (tree namespace, void* data)
783 struct cp_binding_level *level = NAMESPACE_LEVEL (namespace);
784 VEC(tree,gc) *statics = level->static_decls;
785 tree *vec = VEC_address (tree, statics);
786 int len = VEC_length (tree, statics);
787 int last_time = (data != 0);
791 check_global_declarations (vec, len);
792 emit_debug_global_declarations (vec, len);
796 /* Write out any globals that need to be output. */
797 return wrapup_global_declarations (vec, len);
801 /* In C++, you don't have to write `struct S' to refer to `S'; you
802 can just use `S'. We accomplish this by creating a TYPE_DECL as
803 if the user had written `typedef struct S S'. Create and return
804 the TYPE_DECL for TYPE. */
807 create_implicit_typedef (tree name, tree type)
811 decl = build_decl (TYPE_DECL, name, type);
812 DECL_ARTIFICIAL (decl) = 1;
813 /* There are other implicit type declarations, like the one *within*
814 a class that allows you to write `S::S'. We must distinguish
816 SET_DECL_IMPLICIT_TYPEDEF_P (decl);
817 TYPE_NAME (type) = decl;
822 /* Remember a local name for name-mangling purposes. */
825 push_local_name (tree decl)
830 timevar_push (TV_NAME_LOOKUP);
832 name = DECL_NAME (decl);
834 nelts = VEC_length (tree, local_names);
835 for (i = 0; i < nelts; i++)
837 t = VEC_index (tree, local_names, i);
838 if (DECL_NAME (t) == name)
840 if (!DECL_LANG_SPECIFIC (decl))
841 retrofit_lang_decl (decl);
842 DECL_LANG_SPECIFIC (decl)->decl_flags.u2sel = 1;
843 if (DECL_LANG_SPECIFIC (t))
844 DECL_DISCRIMINATOR (decl) = DECL_DISCRIMINATOR (t) + 1;
846 DECL_DISCRIMINATOR (decl) = 1;
848 VEC_replace (tree, local_names, i, decl);
849 timevar_pop (TV_NAME_LOOKUP);
854 VEC_safe_push (tree, gc, local_names, decl);
855 timevar_pop (TV_NAME_LOOKUP);
858 /* Subroutine of duplicate_decls: return truthvalue of whether
859 or not types of these decls match.
861 For C++, we must compare the parameter list so that `int' can match
862 `int&' in a parameter position, but `int&' is not confused with
866 decls_match (tree newdecl, tree olddecl)
870 if (newdecl == olddecl)
873 if (TREE_CODE (newdecl) != TREE_CODE (olddecl))
874 /* If the two DECLs are not even the same kind of thing, we're not
875 interested in their types. */
878 if (TREE_CODE (newdecl) == FUNCTION_DECL)
880 tree f1 = TREE_TYPE (newdecl);
881 tree f2 = TREE_TYPE (olddecl);
882 tree p1 = TYPE_ARG_TYPES (f1);
883 tree p2 = TYPE_ARG_TYPES (f2);
885 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
886 && ! (DECL_EXTERN_C_P (newdecl)
887 && DECL_EXTERN_C_P (olddecl)))
890 if (TREE_CODE (f1) != TREE_CODE (f2))
893 if (same_type_p (TREE_TYPE (f1), TREE_TYPE (f2)))
895 if (p2 == NULL_TREE && DECL_EXTERN_C_P (olddecl)
896 && (DECL_BUILT_IN (olddecl)
897 #ifndef NO_IMPLICIT_EXTERN_C
898 || (DECL_IN_SYSTEM_HEADER (newdecl) && !DECL_CLASS_SCOPE_P (newdecl))
899 || (DECL_IN_SYSTEM_HEADER (olddecl) && !DECL_CLASS_SCOPE_P (olddecl))
903 types_match = self_promoting_args_p (p1);
904 if (p1 == void_list_node)
905 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
907 #ifndef NO_IMPLICIT_EXTERN_C
908 else if (p1 == NULL_TREE
909 && (DECL_EXTERN_C_P (olddecl)
910 && DECL_IN_SYSTEM_HEADER (olddecl)
911 && !DECL_CLASS_SCOPE_P (olddecl))
912 && (DECL_EXTERN_C_P (newdecl)
913 && DECL_IN_SYSTEM_HEADER (newdecl)
914 && !DECL_CLASS_SCOPE_P (newdecl)))
916 types_match = self_promoting_args_p (p2);
917 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
921 types_match = compparms (p1, p2);
926 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
928 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl))
929 != TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)))
932 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
933 DECL_TEMPLATE_PARMS (olddecl)))
936 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
937 types_match = same_type_p (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl)),
938 TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl)));
940 types_match = decls_match (DECL_TEMPLATE_RESULT (olddecl),
941 DECL_TEMPLATE_RESULT (newdecl));
945 /* Need to check scope for variable declaration (VAR_DECL).
946 For typedef (TYPE_DECL), scope is ignored. */
947 if (TREE_CODE (newdecl) == VAR_DECL
948 && CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
951 if (TREE_TYPE (newdecl) == error_mark_node)
952 types_match = TREE_TYPE (olddecl) == error_mark_node;
953 else if (TREE_TYPE (olddecl) == NULL_TREE)
954 types_match = TREE_TYPE (newdecl) == NULL_TREE;
955 else if (TREE_TYPE (newdecl) == NULL_TREE)
958 types_match = comptypes (TREE_TYPE (newdecl),
960 COMPARE_REDECLARATION);
966 /* If NEWDECL is `static' and an `extern' was seen previously,
967 warn about it. OLDDECL is the previous declaration.
969 Note that this does not apply to the C++ case of declaring
970 a variable `extern const' and then later `const'.
972 Don't complain about built-in functions, since they are beyond
973 the user's control. */
976 warn_extern_redeclared_static (tree newdecl, tree olddecl)
980 if (TREE_CODE (newdecl) == TYPE_DECL
981 || TREE_CODE (newdecl) == TEMPLATE_DECL
982 || TREE_CODE (newdecl) == CONST_DECL
983 || TREE_CODE (newdecl) == NAMESPACE_DECL)
986 /* Don't get confused by static member functions; that's a different
988 if (TREE_CODE (newdecl) == FUNCTION_DECL
989 && DECL_STATIC_FUNCTION_P (newdecl))
992 /* If the old declaration was `static', or the new one isn't, then
993 then everything is OK. */
994 if (DECL_THIS_STATIC (olddecl) || !DECL_THIS_STATIC (newdecl))
997 /* It's OK to declare a builtin function as `static'. */
998 if (TREE_CODE (olddecl) == FUNCTION_DECL
999 && DECL_ARTIFICIAL (olddecl))
1002 name = DECL_ASSEMBLER_NAME (newdecl);
1003 pedwarn ("%qD was declared %<extern%> and later %<static%>", newdecl);
1004 pedwarn ("previous declaration of %q+D", olddecl);
1007 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1008 If the redeclaration is invalid, a diagnostic is issued, and the
1009 error_mark_node is returned. Otherwise, OLDDECL is returned.
1011 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1014 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1017 duplicate_decls (tree newdecl, tree olddecl, bool newdecl_is_friend)
1019 unsigned olddecl_uid = DECL_UID (olddecl);
1020 int olddecl_friend = 0, types_match = 0, hidden_friend = 0;
1021 int new_defines_function = 0;
1023 if (newdecl == olddecl)
1026 types_match = decls_match (newdecl, olddecl);
1028 /* If either the type of the new decl or the type of the old decl is an
1029 error_mark_node, then that implies that we have already issued an
1030 error (earlier) for some bogus type specification, and in that case,
1031 it is rather pointless to harass the user with yet more error message
1032 about the same declaration, so just pretend the types match here. */
1033 if (TREE_TYPE (newdecl) == error_mark_node
1034 || TREE_TYPE (olddecl) == error_mark_node)
1037 if (DECL_P (olddecl)
1038 && TREE_CODE (newdecl) == FUNCTION_DECL
1039 && TREE_CODE (olddecl) == FUNCTION_DECL
1040 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1042 if (DECL_DECLARED_INLINE_P (newdecl)
1043 && DECL_UNINLINABLE (newdecl)
1044 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1045 /* Already warned elsewhere. */;
1046 else if (DECL_DECLARED_INLINE_P (olddecl)
1047 && DECL_UNINLINABLE (olddecl)
1048 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1049 /* Already warned. */;
1050 else if (DECL_DECLARED_INLINE_P (newdecl)
1051 && DECL_UNINLINABLE (olddecl)
1052 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1054 warning (OPT_Wattributes, "function %q+D redeclared as inline",
1056 warning (OPT_Wattributes, "previous declaration of %q+D "
1057 "with attribute noinline", olddecl);
1059 else if (DECL_DECLARED_INLINE_P (olddecl)
1060 && DECL_UNINLINABLE (newdecl)
1061 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1063 warning (OPT_Wattributes, "function %q+D redeclared with "
1064 "attribute noinline", newdecl);
1065 warning (OPT_Wattributes, "previous declaration of %q+D was inline",
1070 /* Check for redeclaration and other discrepancies. */
1071 if (TREE_CODE (olddecl) == FUNCTION_DECL
1072 && DECL_ARTIFICIAL (olddecl))
1074 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl));
1075 if (TREE_CODE (newdecl) != FUNCTION_DECL)
1077 /* Avoid warnings redeclaring built-ins which have not been
1078 explicitly declared. */
1079 if (DECL_ANTICIPATED (olddecl))
1082 /* If you declare a built-in or predefined function name as static,
1083 the old definition is overridden, but optionally warn this was a
1084 bad choice of name. */
1085 if (! TREE_PUBLIC (newdecl))
1088 warning (0, "shadowing %s function %q#D",
1089 DECL_BUILT_IN (olddecl) ? "built-in" : "library",
1091 /* Discard the old built-in function. */
1094 /* If the built-in is not ansi, then programs can override
1095 it even globally without an error. */
1096 else if (! DECL_BUILT_IN (olddecl))
1097 warning (0, "library function %q#D redeclared as non-function %q#D",
1101 error ("declaration of %q#D", newdecl);
1102 error ("conflicts with built-in declaration %q#D",
1107 else if (!types_match)
1109 /* Avoid warnings redeclaring built-ins which have not been
1110 explicitly declared. */
1111 if (DECL_ANTICIPATED (olddecl))
1113 /* Deal with fileptr_type_node. FILE type is not known
1114 at the time we create the builtins. */
1117 for (t1 = TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1118 t2 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1120 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1123 else if (TREE_VALUE (t2) == fileptr_type_node)
1125 tree t = TREE_VALUE (t1);
1127 if (TREE_CODE (t) == POINTER_TYPE
1128 && TYPE_NAME (TREE_TYPE (t))
1129 && DECL_NAME (TYPE_NAME (TREE_TYPE (t)))
1130 == get_identifier ("FILE")
1131 && compparms (TREE_CHAIN (t1), TREE_CHAIN (t2)))
1133 tree oldargs = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1135 TYPE_ARG_TYPES (TREE_TYPE (olddecl))
1136 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1137 types_match = decls_match (newdecl, olddecl);
1139 return duplicate_decls (newdecl, olddecl,
1141 TYPE_ARG_TYPES (TREE_TYPE (olddecl)) = oldargs;
1144 else if (! same_type_p (TREE_VALUE (t1), TREE_VALUE (t2)))
1147 else if ((DECL_EXTERN_C_P (newdecl)
1148 && DECL_EXTERN_C_P (olddecl))
1149 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1150 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1152 /* A near match; override the builtin. */
1154 if (TREE_PUBLIC (newdecl))
1156 warning (0, "new declaration %q#D", newdecl);
1157 warning (0, "ambiguates built-in declaration %q#D",
1160 else if (warn_shadow)
1161 warning (0, "shadowing %s function %q#D",
1162 DECL_BUILT_IN (olddecl) ? "built-in" : "library",
1166 /* Discard the old built-in function. */
1169 /* Replace the old RTL to avoid problems with inlining. */
1170 COPY_DECL_RTL (newdecl, olddecl);
1172 /* Even if the types match, prefer the new declarations type for
1173 built-ins which have not been explicitly declared, for
1174 exception lists, etc... */
1175 else if (DECL_ANTICIPATED (olddecl))
1177 tree type = TREE_TYPE (newdecl);
1178 tree attribs = (*targetm.merge_type_attributes)
1179 (TREE_TYPE (olddecl), type);
1181 type = cp_build_type_attribute_variant (type, attribs);
1182 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = type;
1185 /* Whether or not the builtin can throw exceptions has no
1186 bearing on this declarator. */
1187 TREE_NOTHROW (olddecl) = 0;
1189 if (DECL_THIS_STATIC (newdecl) && !DECL_THIS_STATIC (olddecl))
1191 /* If a builtin function is redeclared as `static', merge
1192 the declarations, but make the original one static. */
1193 DECL_THIS_STATIC (olddecl) = 1;
1194 TREE_PUBLIC (olddecl) = 0;
1196 /* Make the old declaration consistent with the new one so
1197 that all remnants of the builtin-ness of this function
1198 will be banished. */
1199 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1200 COPY_DECL_RTL (newdecl, olddecl);
1203 else if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1205 if ((TREE_CODE (olddecl) == TYPE_DECL && DECL_ARTIFICIAL (olddecl)
1206 && TREE_CODE (newdecl) != TYPE_DECL
1207 && ! (TREE_CODE (newdecl) == TEMPLATE_DECL
1208 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL))
1209 || (TREE_CODE (newdecl) == TYPE_DECL && DECL_ARTIFICIAL (newdecl)
1210 && TREE_CODE (olddecl) != TYPE_DECL
1211 && ! (TREE_CODE (olddecl) == TEMPLATE_DECL
1212 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
1215 /* We do nothing special here, because C++ does such nasty
1216 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1217 get shadowed, and know that if we need to find a TYPE_DECL
1218 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1219 slot of the identifier. */
1223 if ((TREE_CODE (newdecl) == FUNCTION_DECL
1224 && DECL_FUNCTION_TEMPLATE_P (olddecl))
1225 || (TREE_CODE (olddecl) == FUNCTION_DECL
1226 && DECL_FUNCTION_TEMPLATE_P (newdecl)))
1229 error ("%q#D redeclared as different kind of symbol", newdecl);
1230 if (TREE_CODE (olddecl) == TREE_LIST)
1231 olddecl = TREE_VALUE (olddecl);
1232 error ("previous declaration of %q+#D", olddecl);
1234 return error_mark_node;
1236 else if (!types_match)
1238 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
1239 /* These are certainly not duplicate declarations; they're
1240 from different scopes. */
1243 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1245 /* The name of a class template may not be declared to refer to
1246 any other template, class, function, object, namespace, value,
1247 or type in the same scope. */
1248 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == TYPE_DECL
1249 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1251 error ("declaration of template %q#D", newdecl);
1252 error ("conflicts with previous declaration %q+#D", olddecl);
1254 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == FUNCTION_DECL
1255 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == FUNCTION_DECL
1256 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl))),
1257 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl))))
1258 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1259 DECL_TEMPLATE_PARMS (olddecl))
1260 /* Template functions can be disambiguated by
1262 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl)),
1263 TREE_TYPE (TREE_TYPE (olddecl))))
1265 error ("new declaration %q#D", newdecl);
1266 error ("ambiguates old declaration %q+#D", olddecl);
1270 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1272 if (DECL_EXTERN_C_P (newdecl) && DECL_EXTERN_C_P (olddecl))
1274 error ("declaration of C function %q#D conflicts with",
1276 error ("previous declaration %q+#D here", olddecl);
1278 else if (compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1279 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1281 error ("new declaration %q#D", newdecl);
1282 error ("ambiguates old declaration %q+#D", olddecl);
1289 error ("conflicting declaration %q#D", newdecl);
1290 error ("%q+D has a previous declaration as %q#D", olddecl, olddecl);
1291 return error_mark_node;
1294 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1295 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1296 && (!DECL_TEMPLATE_INFO (newdecl)
1297 || (DECL_TI_TEMPLATE (newdecl)
1298 != DECL_TI_TEMPLATE (olddecl))))
1299 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1300 && (!DECL_TEMPLATE_INFO (olddecl)
1301 || (DECL_TI_TEMPLATE (olddecl)
1302 != DECL_TI_TEMPLATE (newdecl))))))
1303 /* It's OK to have a template specialization and a non-template
1304 with the same type, or to have specializations of two
1305 different templates with the same type. Note that if one is a
1306 specialization, and the other is an instantiation of the same
1307 template, that we do not exit at this point. That situation
1308 can occur if we instantiate a template class, and then
1309 specialize one of its methods. This situation is valid, but
1310 the declarations must be merged in the usual way. */
1312 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1313 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1314 && !DECL_USE_TEMPLATE (newdecl))
1315 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1316 && !DECL_USE_TEMPLATE (olddecl))))
1317 /* One of the declarations is a template instantiation, and the
1318 other is not a template at all. That's OK. */
1320 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1322 /* In [namespace.alias] we have:
1324 In a declarative region, a namespace-alias-definition can be
1325 used to redefine a namespace-alias declared in that declarative
1326 region to refer only to the namespace to which it already
1329 Therefore, if we encounter a second alias directive for the same
1330 alias, we can just ignore the second directive. */
1331 if (DECL_NAMESPACE_ALIAS (newdecl)
1332 && (DECL_NAMESPACE_ALIAS (newdecl)
1333 == DECL_NAMESPACE_ALIAS (olddecl)))
1335 /* [namespace.alias]
1337 A namespace-name or namespace-alias shall not be declared as
1338 the name of any other entity in the same declarative region.
1339 A namespace-name defined at global scope shall not be
1340 declared as the name of any other entity in any global scope
1342 error ("declaration of namespace %qD conflicts with", newdecl);
1343 error ("previous declaration of namespace %q+D here", olddecl);
1344 return error_mark_node;
1348 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1351 error (errmsg, newdecl);
1352 if (DECL_NAME (olddecl) != NULL_TREE)
1353 error ((DECL_INITIAL (olddecl) && namespace_bindings_p ())
1354 ? "%q+#D previously defined here"
1355 : "%q+#D previously declared here", olddecl);
1356 return error_mark_node;
1358 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1359 && DECL_INITIAL (olddecl) != NULL_TREE
1360 && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) == NULL_TREE
1361 && TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != NULL_TREE)
1363 /* Prototype decl follows defn w/o prototype. */
1364 warning (0, "prototype for %q+#D", newdecl);
1365 warning (0, "%Jfollows non-prototype definition here", olddecl);
1367 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1368 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1370 /* extern "C" int foo ();
1371 int foo () { bar (); }
1373 if (current_lang_depth () == 0)
1374 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1377 error ("previous declaration of %q+#D with %qL linkage",
1378 olddecl, DECL_LANGUAGE (olddecl));
1379 error ("conflicts with new declaration with %qL linkage",
1380 DECL_LANGUAGE (newdecl));
1384 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1386 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1388 tree t1 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1389 tree t2 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1392 if (TREE_CODE (TREE_TYPE (newdecl)) == METHOD_TYPE)
1393 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2);
1395 for (; t1 && t1 != void_list_node;
1396 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1397 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1399 if (1 == simple_cst_equal (TREE_PURPOSE (t1),
1402 pedwarn ("default argument given for parameter %d of %q#D",
1404 pedwarn ("after previous specification in %q+#D", olddecl);
1408 error ("default argument given for parameter %d of %q#D",
1410 error ("after previous specification in %q+#D",
1415 if (DECL_DECLARED_INLINE_P (newdecl)
1416 && ! DECL_DECLARED_INLINE_P (olddecl)
1417 && TREE_ADDRESSABLE (olddecl) && warn_inline)
1419 warning (0, "%q#D was used before it was declared inline", newdecl);
1420 warning (0, "%Jprevious non-inline declaration here", olddecl);
1425 /* Do not merge an implicit typedef with an explicit one. In:
1429 typedef class A A __attribute__ ((foo));
1431 the attribute should apply only to the typedef. */
1432 if (TREE_CODE (olddecl) == TYPE_DECL
1433 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1434 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1437 /* If new decl is `static' and an `extern' was seen previously,
1439 warn_extern_redeclared_static (newdecl, olddecl);
1441 /* We have committed to returning 1 at this point. */
1442 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1444 /* Now that functions must hold information normally held
1445 by field decls, there is extra work to do so that
1446 declaration information does not get destroyed during
1448 if (DECL_VINDEX (olddecl))
1449 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1450 if (DECL_CONTEXT (olddecl))
1451 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1452 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1453 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1454 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1455 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1456 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1457 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1458 SET_OVERLOADED_OPERATOR_CODE
1459 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1460 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1462 /* Optionally warn about more than one declaration for the same
1463 name, but don't warn about a function declaration followed by a
1465 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1466 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1467 /* Don't warn about extern decl followed by definition. */
1468 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1469 /* Don't warn about friends, let add_friend take care of it. */
1470 && ! (newdecl_is_friend || DECL_FRIEND_P (olddecl)))
1472 warning (0, "redundant redeclaration of %qD in same scope", newdecl);
1473 warning (0, "previous declaration of %q+D", olddecl);
1477 /* Deal with C++: must preserve virtual function table size. */
1478 if (TREE_CODE (olddecl) == TYPE_DECL)
1480 tree newtype = TREE_TYPE (newdecl);
1481 tree oldtype = TREE_TYPE (olddecl);
1483 if (newtype != error_mark_node && oldtype != error_mark_node
1484 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1485 CLASSTYPE_FRIEND_CLASSES (newtype)
1486 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1488 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1491 /* Copy all the DECL_... slots specified in the new decl
1492 except for any that we copy here from the old type. */
1493 DECL_ATTRIBUTES (newdecl)
1494 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1496 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1498 TREE_TYPE (olddecl) = TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl));
1499 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1500 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1501 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1503 /* If the new declaration is a definition, update the file and
1504 line information on the declaration. */
1505 if (DECL_INITIAL (DECL_TEMPLATE_RESULT (olddecl)) == NULL_TREE
1506 && DECL_INITIAL (DECL_TEMPLATE_RESULT (newdecl)) != NULL_TREE)
1508 DECL_SOURCE_LOCATION (olddecl)
1509 = DECL_SOURCE_LOCATION (DECL_TEMPLATE_RESULT (olddecl))
1510 = DECL_SOURCE_LOCATION (newdecl);
1511 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1512 DECL_ARGUMENTS (DECL_TEMPLATE_RESULT (olddecl))
1513 = DECL_ARGUMENTS (DECL_TEMPLATE_RESULT (newdecl));
1516 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1518 DECL_INLINE (DECL_TEMPLATE_RESULT (olddecl))
1519 |= DECL_INLINE (DECL_TEMPLATE_RESULT (newdecl));
1520 DECL_DECLARED_INLINE_P (DECL_TEMPLATE_RESULT (olddecl))
1521 |= DECL_DECLARED_INLINE_P (DECL_TEMPLATE_RESULT (newdecl));
1529 /* Automatically handles default parameters. */
1530 tree oldtype = TREE_TYPE (olddecl);
1533 /* Merge the data types specified in the two decls. */
1534 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1536 /* If merge_types produces a non-typedef type, just use the old type. */
1537 if (TREE_CODE (newdecl) == TYPE_DECL
1538 && newtype == DECL_ORIGINAL_TYPE (newdecl))
1541 if (TREE_CODE (newdecl) == VAR_DECL)
1543 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
1544 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
1545 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl)
1546 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl);
1547 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
1548 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
1551 /* Do this after calling `merge_types' so that default
1552 parameters don't confuse us. */
1553 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1554 && (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (newdecl))
1555 != TYPE_RAISES_EXCEPTIONS (TREE_TYPE (olddecl))))
1557 TREE_TYPE (newdecl) = build_exception_variant (newtype,
1558 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (newdecl)));
1559 TREE_TYPE (olddecl) = build_exception_variant (newtype,
1560 TYPE_RAISES_EXCEPTIONS (oldtype));
1562 if ((pedantic || ! DECL_IN_SYSTEM_HEADER (olddecl))
1563 && ! DECL_IS_BUILTIN (olddecl)
1565 && !comp_except_specs (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (newdecl)),
1566 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (olddecl)), 1))
1568 error ("declaration of %qF throws different exceptions",
1570 error ("than previous declaration %q+F", olddecl);
1573 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
1575 /* Lay the type out, unless already done. */
1576 if (! same_type_p (newtype, oldtype)
1577 && TREE_TYPE (newdecl) != error_mark_node
1578 && !(processing_template_decl && uses_template_parms (newdecl)))
1579 layout_type (TREE_TYPE (newdecl));
1581 if ((TREE_CODE (newdecl) == VAR_DECL
1582 || TREE_CODE (newdecl) == PARM_DECL
1583 || TREE_CODE (newdecl) == RESULT_DECL
1584 || TREE_CODE (newdecl) == FIELD_DECL
1585 || TREE_CODE (newdecl) == TYPE_DECL)
1586 && !(processing_template_decl && uses_template_parms (newdecl)))
1587 layout_decl (newdecl, 0);
1589 /* Merge the type qualifiers. */
1590 if (TREE_READONLY (newdecl))
1591 TREE_READONLY (olddecl) = 1;
1592 if (TREE_THIS_VOLATILE (newdecl))
1593 TREE_THIS_VOLATILE (olddecl) = 1;
1594 if (TREE_NOTHROW (newdecl))
1595 TREE_NOTHROW (olddecl) = 1;
1597 /* Merge deprecatedness. */
1598 if (TREE_DEPRECATED (newdecl))
1599 TREE_DEPRECATED (olddecl) = 1;
1601 /* Merge the initialization information. */
1602 if (DECL_INITIAL (newdecl) == NULL_TREE
1603 && DECL_INITIAL (olddecl) != NULL_TREE)
1605 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1606 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1607 if (CAN_HAVE_FULL_LANG_DECL_P (newdecl)
1608 && DECL_LANG_SPECIFIC (newdecl)
1609 && DECL_LANG_SPECIFIC (olddecl))
1611 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1612 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1616 /* Merge the section attribute.
1617 We want to issue an error if the sections conflict but that must be
1618 done later in decl_attributes since we are called before attributes
1620 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1621 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1623 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1625 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1626 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1627 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1628 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1629 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1630 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
1631 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1632 DECL_IS_PURE (newdecl) |= DECL_IS_PURE (olddecl);
1633 /* Keep the old RTL. */
1634 COPY_DECL_RTL (olddecl, newdecl);
1636 else if (TREE_CODE (newdecl) == VAR_DECL
1637 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
1639 /* Keep the old RTL. We cannot keep the old RTL if the old
1640 declaration was for an incomplete object and the new
1641 declaration is not since many attributes of the RTL will
1643 COPY_DECL_RTL (olddecl, newdecl);
1646 /* If cannot merge, then use the new type and qualifiers,
1647 and don't preserve the old rtl. */
1650 /* Clean out any memory we had of the old declaration. */
1651 tree oldstatic = value_member (olddecl, static_aggregates);
1653 TREE_VALUE (oldstatic) = error_mark_node;
1655 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1656 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1657 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1658 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1661 /* Merge the storage class information. */
1662 merge_weak (newdecl, olddecl);
1664 DECL_ONE_ONLY (newdecl) |= DECL_ONE_ONLY (olddecl);
1665 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
1666 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1667 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
1668 if (! DECL_EXTERNAL (olddecl))
1669 DECL_EXTERNAL (newdecl) = 0;
1671 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
1673 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
1674 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
1675 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
1676 DECL_TEMPLATE_INSTANTIATED (newdecl)
1677 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
1679 /* If the OLDDECL is an instantiation and/or specialization,
1680 then the NEWDECL must be too. But, it may not yet be marked
1681 as such if the caller has created NEWDECL, but has not yet
1682 figured out that it is a redeclaration. */
1683 if (!DECL_USE_TEMPLATE (newdecl))
1684 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
1686 /* Don't really know how much of the language-specific
1687 values we should copy from old to new. */
1688 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
1689 DECL_LANG_SPECIFIC (newdecl)->decl_flags.u2 =
1690 DECL_LANG_SPECIFIC (olddecl)->decl_flags.u2;
1691 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
1692 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
1693 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
1694 DECL_INITIALIZED_IN_CLASS_P (newdecl)
1695 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
1696 olddecl_friend = DECL_FRIEND_P (olddecl);
1697 hidden_friend = (DECL_ANTICIPATED (olddecl)
1698 && DECL_HIDDEN_FRIEND_P (olddecl)
1699 && newdecl_is_friend);
1701 /* Only functions have DECL_BEFRIENDING_CLASSES. */
1702 if (TREE_CODE (newdecl) == FUNCTION_DECL
1703 || DECL_FUNCTION_TEMPLATE_P (newdecl))
1705 DECL_BEFRIENDING_CLASSES (newdecl)
1706 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
1707 DECL_BEFRIENDING_CLASSES (olddecl));
1708 /* DECL_THUNKS is only valid for virtual functions,
1709 otherwise it is a DECL_FRIEND_CONTEXT. */
1710 if (DECL_VIRTUAL_P (newdecl))
1711 DECL_THUNKS (newdecl) = DECL_THUNKS (olddecl);
1715 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1717 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
1718 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
1720 /* If newdecl is not a specialization, then it is not a
1721 template-related function at all. And that means that we
1722 should have exited above, returning 0. */
1723 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
1725 if (TREE_USED (olddecl))
1726 /* From [temp.expl.spec]:
1728 If a template, a member template or the member of a class
1729 template is explicitly specialized then that
1730 specialization shall be declared before the first use of
1731 that specialization that would cause an implicit
1732 instantiation to take place, in every translation unit in
1733 which such a use occurs. */
1734 error ("explicit specialization of %qD after first use",
1737 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
1739 /* [temp.expl.spec/14] We don't inline explicit specialization
1740 just because the primary template says so. */
1744 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
1745 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
1747 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
1749 /* If either decl says `inline', this fn is inline, unless
1750 its definition was passed already. */
1751 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == NULL_TREE)
1752 DECL_INLINE (olddecl) = 1;
1753 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1755 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1756 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1759 /* Preserve abstractness on cloned [cd]tors. */
1760 DECL_ABSTRACT (newdecl) = DECL_ABSTRACT (olddecl);
1764 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1765 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
1766 COPY_DECL_RTL (newdecl, olddecl);
1768 if (! types_match || new_defines_function)
1770 /* These need to be copied so that the names are available.
1771 Note that if the types do match, we'll preserve inline
1772 info and other bits, but if not, we won't. */
1773 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
1774 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
1776 if (new_defines_function)
1777 /* If defining a function declared with other language
1778 linkage, use the previously declared language linkage. */
1779 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1780 else if (types_match)
1782 /* If redeclaring a builtin function, and not a definition,
1783 it stays built in. */
1784 if (DECL_BUILT_IN (olddecl))
1786 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1787 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1788 /* If we're keeping the built-in definition, keep the rtl,
1789 regardless of declaration matches. */
1790 COPY_DECL_RTL (olddecl, newdecl);
1793 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1794 /* Don't clear out the arguments if we're redefining a function. */
1795 if (DECL_ARGUMENTS (olddecl))
1796 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1799 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1800 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
1802 /* Now preserve various other info from the definition. */
1803 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
1804 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
1805 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
1806 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1808 /* Warn about conflicting visibility specifications. */
1809 if (DECL_VISIBILITY_SPECIFIED (olddecl)
1810 && DECL_VISIBILITY_SPECIFIED (newdecl)
1811 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
1813 warning (OPT_Wattributes, "%q+D: visibility attribute ignored "
1814 "because it", newdecl);
1815 warning (OPT_Wattributes, "%Jconflicts with previous "
1816 "declaration here", olddecl);
1818 /* Choose the declaration which specified visibility. */
1819 if (DECL_VISIBILITY_SPECIFIED (olddecl))
1821 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
1822 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
1824 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
1825 so keep this behavior. */
1826 if (TREE_CODE (newdecl) == VAR_DECL && DECL_HAS_INIT_PRIORITY_P (newdecl))
1828 SET_DECL_INIT_PRIORITY (olddecl, DECL_INIT_PRIORITY (newdecl));
1829 DECL_HAS_INIT_PRIORITY_P (olddecl) = 1;
1832 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
1833 with that from NEWDECL below. */
1834 if (DECL_LANG_SPECIFIC (olddecl))
1836 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
1837 != DECL_LANG_SPECIFIC (newdecl));
1838 ggc_free (DECL_LANG_SPECIFIC (olddecl));
1841 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1845 function_size = sizeof (struct tree_decl_common);
1847 memcpy ((char *) olddecl + sizeof (struct tree_common),
1848 (char *) newdecl + sizeof (struct tree_common),
1849 function_size - sizeof (struct tree_common));
1851 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
1852 (char *) newdecl + sizeof (struct tree_decl_common),
1853 sizeof (struct tree_function_decl) - sizeof (struct tree_decl_common));
1854 if (DECL_TEMPLATE_INFO (newdecl))
1855 /* If newdecl is a template instantiation, it is possible that
1856 the following sequence of events has occurred:
1858 o A friend function was declared in a class template. The
1859 class template was instantiated.
1861 o The instantiation of the friend declaration was
1862 recorded on the instantiation list, and is newdecl.
1864 o Later, however, instantiate_class_template called pushdecl
1865 on the newdecl to perform name injection. But, pushdecl in
1866 turn called duplicate_decls when it discovered that another
1867 declaration of a global function with the same name already
1870 o Here, in duplicate_decls, we decided to clobber newdecl.
1872 If we're going to do that, we'd better make sure that
1873 olddecl, and not newdecl, is on the list of
1874 instantiations so that if we try to do the instantiation
1875 again we won't get the clobbered declaration. */
1876 reregister_specialization (newdecl,
1877 DECL_TI_TEMPLATE (newdecl),
1882 size_t size = tree_code_size (TREE_CODE (olddecl));
1883 memcpy ((char *) olddecl + sizeof (struct tree_common),
1884 (char *) newdecl + sizeof (struct tree_common),
1885 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
1886 switch (TREE_CODE (olddecl))
1896 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
1897 (char *) newdecl + sizeof (struct tree_decl_common),
1898 size - sizeof (struct tree_decl_common)
1899 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
1903 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
1904 (char *) newdecl + sizeof (struct tree_decl_common),
1905 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)
1906 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
1910 DECL_UID (olddecl) = olddecl_uid;
1912 DECL_FRIEND_P (olddecl) = 1;
1915 DECL_ANTICIPATED (olddecl) = 1;
1916 DECL_HIDDEN_FRIEND_P (olddecl) = 1;
1919 /* NEWDECL contains the merged attribute lists.
1920 Update OLDDECL to be the same. */
1921 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
1923 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
1924 so that encode_section_info has a chance to look at the new decl
1925 flags and attributes. */
1926 if (DECL_RTL_SET_P (olddecl)
1927 && (TREE_CODE (olddecl) == FUNCTION_DECL
1928 || (TREE_CODE (olddecl) == VAR_DECL
1929 && TREE_STATIC (olddecl))))
1930 make_decl_rtl (olddecl);
1932 /* The NEWDECL will no longer be needed. Because every out-of-class
1933 declaration of a member results in a call to duplicate_decls,
1934 freeing these nodes represents in a significant savings. */
1940 /* Return zero if the declaration NEWDECL is valid
1941 when the declaration OLDDECL (assumed to be for the same name)
1942 has already been seen.
1943 Otherwise return an error message format string with a %s
1944 where the identifier should go. */
1947 redeclaration_error_message (tree newdecl, tree olddecl)
1949 if (TREE_CODE (newdecl) == TYPE_DECL)
1951 /* Because C++ can put things into name space for free,
1952 constructs like "typedef struct foo { ... } foo"
1953 would look like an erroneous redeclaration. */
1954 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
1957 return "redefinition of %q#D";
1959 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1961 /* If this is a pure function, its olddecl will actually be
1962 the original initialization to `0' (which we force to call
1963 abort()). Don't complain about redefinition in this case. */
1964 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
1965 && DECL_INITIAL (olddecl) == NULL_TREE)
1968 /* If both functions come from different namespaces, this is not
1969 a redeclaration - this is a conflict with a used function. */
1970 if (DECL_NAMESPACE_SCOPE_P (olddecl)
1971 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
1972 && ! decls_match (olddecl, newdecl))
1973 return "%qD conflicts with used function";
1975 /* We'll complain about linkage mismatches in
1976 warn_extern_redeclared_static. */
1978 /* Defining the same name twice is no good. */
1979 if (DECL_INITIAL (olddecl) != NULL_TREE
1980 && DECL_INITIAL (newdecl) != NULL_TREE)
1982 if (DECL_NAME (olddecl) == NULL_TREE)
1983 return "%q#D not declared in class";
1985 return "redefinition of %q#D";
1989 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1993 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1995 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
1996 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
1997 return "redefinition of %q#D";
2001 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
2002 || (DECL_TEMPLATE_RESULT (newdecl)
2003 == DECL_TEMPLATE_RESULT (olddecl)))
2006 nt = DECL_TEMPLATE_RESULT (newdecl);
2007 if (DECL_TEMPLATE_INFO (nt))
2008 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
2009 ot = DECL_TEMPLATE_RESULT (olddecl);
2010 if (DECL_TEMPLATE_INFO (ot))
2011 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
2012 if (DECL_INITIAL (nt) && DECL_INITIAL (ot))
2013 return "redefinition of %q#D";
2017 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2019 /* Objects declared at top level: */
2020 /* If at least one is a reference, it's ok. */
2021 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2023 /* Reject two definitions. */
2024 return "redefinition of %q#D";
2028 /* Objects declared with block scope: */
2029 /* Reject two definitions, and reject a definition
2030 together with an external reference. */
2031 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2032 return "redeclaration of %q#D";
2037 /* Create a new label, named ID. */
2040 make_label_decl (tree id, int local_p)
2044 decl = build_decl (LABEL_DECL, id, void_type_node);
2046 DECL_CONTEXT (decl) = current_function_decl;
2047 DECL_MODE (decl) = VOIDmode;
2048 C_DECLARED_LABEL_FLAG (decl) = local_p;
2050 /* Say where one reference is to the label, for the sake of the
2051 error if it is not defined. */
2052 DECL_SOURCE_LOCATION (decl) = input_location;
2054 /* Record the fact that this identifier is bound to this label. */
2055 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2060 /* Record this label on the list of used labels so that we can check
2061 at the end of the function to see whether or not the label was
2062 actually defined, and so we can check when the label is defined whether
2063 this use is valid. */
2066 use_label (tree decl)
2068 if (named_label_uses == NULL
2069 || named_label_uses->names_in_scope != current_binding_level->names
2070 || named_label_uses->label_decl != decl)
2072 struct named_label_use_list *new_ent;
2073 new_ent = GGC_NEW (struct named_label_use_list);
2074 new_ent->label_decl = decl;
2075 new_ent->names_in_scope = current_binding_level->names;
2076 new_ent->binding_level = current_binding_level;
2077 new_ent->o_goto_locus = input_location;
2078 new_ent->next = named_label_uses;
2079 named_label_uses = new_ent;
2083 /* Look for a label named ID in the current function. If one cannot
2084 be found, create one. (We keep track of used, but undefined,
2085 labels, and complain about them at the end of a function.) */
2088 lookup_label (tree id)
2091 struct named_label_list *ent;
2093 timevar_push (TV_NAME_LOOKUP);
2094 /* You can't use labels at global scope. */
2095 if (current_function_decl == NULL_TREE)
2097 error ("label %qE referenced outside of any function", id);
2098 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, NULL_TREE);
2101 /* See if we've already got this label. */
2102 decl = IDENTIFIER_LABEL_VALUE (id);
2103 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2104 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2106 /* Record this label on the list of labels used in this function.
2107 We do this before calling make_label_decl so that we get the
2108 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2109 ent = GGC_CNEW (struct named_label_list);
2110 ent->old_value = IDENTIFIER_LABEL_VALUE (id);
2111 ent->next = named_labels;
2114 /* We need a new label. */
2115 decl = make_label_decl (id, /*local_p=*/0);
2117 /* Now fill in the information we didn't have before. */
2118 ent->label_decl = decl;
2120 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2123 /* Declare a local label named ID. */
2126 declare_local_label (tree id)
2130 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2131 this scope we can restore the old value of
2132 IDENTIFIER_TYPE_VALUE. */
2133 current_binding_level->shadowed_labels
2134 = tree_cons (IDENTIFIER_LABEL_VALUE (id), NULL_TREE,
2135 current_binding_level->shadowed_labels);
2136 /* Look for the label. */
2137 decl = make_label_decl (id, /*local_p=*/1);
2138 /* Now fill in the information we didn't have before. */
2139 TREE_VALUE (current_binding_level->shadowed_labels) = decl;
2144 /* Returns nonzero if it is ill-formed to jump past the declaration of
2145 DECL. Returns 2 if it's also a real problem. */
2148 decl_jump_unsafe (tree decl)
2150 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl))
2153 if (TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))
2154 || DECL_NONTRIVIALLY_INITIALIZED_P (decl))
2157 if (pod_type_p (TREE_TYPE (decl)))
2160 /* The POD stuff is just pedantry; why should it matter if the class
2161 contains a field of pointer to member type? */
2165 /* Check that a single previously seen jump to a newly defined label
2166 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2167 the jump context; NAMES are the names in scope in LEVEL at the jump
2168 context; FILE and LINE are the source position of the jump or 0. */
2171 check_previous_goto_1 (tree decl,
2172 struct cp_binding_level* level,
2173 tree names, const location_t *locus)
2177 struct cp_binding_level *b = current_binding_level;
2178 for (; b; b = b->level_chain)
2180 tree new_decls = b->names;
2181 tree old_decls = (b == level ? names : NULL_TREE);
2182 for (; new_decls != old_decls;
2183 new_decls = TREE_CHAIN (new_decls))
2185 int problem = decl_jump_unsafe (new_decls);
2192 pedwarn ("jump to label %qD", decl);
2194 pedwarn ("jump to case label");
2197 pedwarn ("%H from here", locus);
2202 error (" crosses initialization of %q+#D", new_decls);
2204 pedwarn (" enters scope of non-POD %q+#D", new_decls);
2209 if ((b->kind == sk_try || b->kind == sk_catch) && ! saw_eh)
2214 pedwarn ("jump to label %qD", decl);
2216 pedwarn ("jump to case label");
2219 pedwarn ("%H from here", locus);
2222 if (b->kind == sk_try)
2223 error (" enters try block");
2225 error (" enters catch block");
2232 check_previous_goto (struct named_label_use_list* use)
2234 check_previous_goto_1 (use->label_decl, use->binding_level,
2235 use->names_in_scope, &use->o_goto_locus);
2239 check_switch_goto (struct cp_binding_level* level)
2241 check_previous_goto_1 (NULL_TREE, level, level->names, NULL);
2244 /* Check that any previously seen jumps to a newly defined label DECL
2245 are OK. Called by define_label. */
2248 check_previous_gotos (tree decl)
2250 struct named_label_use_list **usep;
2252 if (! TREE_USED (decl))
2255 for (usep = &named_label_uses; *usep; )
2257 struct named_label_use_list *use = *usep;
2258 if (use->label_decl == decl)
2260 check_previous_goto (use);
2264 usep = &(use->next);
2268 /* Check that a new jump to a label DECL is OK. Called by
2269 finish_goto_stmt. */
2272 check_goto (tree decl)
2276 struct named_label_list *lab;
2278 /* We can't know where a computed goto is jumping. So we assume
2280 if (! DECL_P (decl))
2283 /* If the label hasn't been defined yet, defer checking. */
2284 if (! DECL_INITIAL (decl))
2290 for (lab = named_labels; lab; lab = lab->next)
2291 if (decl == lab->label_decl)
2294 /* If the label is not on named_labels it's a gcc local label, so
2295 it must be in an outer scope, so jumping to it is always OK. */
2299 if ((lab->in_try_scope || lab->in_catch_scope || lab->bad_decls)
2302 pedwarn ("jump to label %q+D", decl);
2303 pedwarn (" from here");
2307 for (bad = lab->bad_decls; bad; bad = TREE_CHAIN (bad))
2309 tree b = TREE_VALUE (bad);
2310 int u = decl_jump_unsafe (b);
2312 if (u > 1 && DECL_ARTIFICIAL (b))
2313 /* Can't skip init of __exception_info. */
2314 error ("%J enters catch block", b);
2316 error (" skips initialization of %q+#D", b);
2318 pedwarn (" enters scope of non-POD %q+#D", b);
2321 if (lab->in_try_scope)
2322 error (" enters try block");
2323 else if (lab->in_catch_scope)
2324 error (" enters catch block");
2327 /* Define a label, specifying the location in the source file.
2328 Return the LABEL_DECL node for the label. */
2331 define_label (location_t location, tree name)
2333 tree decl = lookup_label (name);
2334 struct named_label_list *ent;
2335 struct cp_binding_level *p;
2337 timevar_push (TV_NAME_LOOKUP);
2338 for (ent = named_labels; ent; ent = ent->next)
2339 if (ent->label_decl == decl)
2342 /* After labels, make any new cleanups in the function go into their
2343 own new (temporary) binding contour. */
2344 for (p = current_binding_level;
2345 p->kind != sk_function_parms;
2347 p->more_cleanups_ok = 0;
2349 if (name == get_identifier ("wchar_t"))
2350 pedwarn ("label named wchar_t");
2352 if (DECL_INITIAL (decl) != NULL_TREE)
2353 error ("duplicate label %qD", decl);
2356 /* Mark label as having been defined. */
2357 DECL_INITIAL (decl) = error_mark_node;
2358 /* Say where in the source. */
2359 DECL_SOURCE_LOCATION (decl) = location;
2362 ent->names_in_scope = current_binding_level->names;
2363 ent->binding_level = current_binding_level;
2365 check_previous_gotos (decl);
2368 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2373 struct cp_binding_level *level;
2374 struct cp_switch *next;
2375 /* The SWITCH_STMT being built. */
2377 /* A splay-tree mapping the low element of a case range to the high
2378 element, or NULL_TREE if there is no high element. Used to
2379 determine whether or not a new case label duplicates an old case
2380 label. We need a tree, rather than simply a hash table, because
2381 of the GNU case range extension. */
2385 /* A stack of the currently active switch statements. The innermost
2386 switch statement is on the top of the stack. There is no need to
2387 mark the stack for garbage collection because it is only active
2388 during the processing of the body of a function, and we never
2389 collect at that point. */
2391 static struct cp_switch *switch_stack;
2393 /* Called right after a switch-statement condition is parsed.
2394 SWITCH_STMT is the switch statement being parsed. */
2397 push_switch (tree switch_stmt)
2399 struct cp_switch *p = xmalloc (sizeof (struct cp_switch));
2400 p->level = current_binding_level;
2401 p->next = switch_stack;
2402 p->switch_stmt = switch_stmt;
2403 p->cases = splay_tree_new (case_compare, NULL, NULL);
2410 struct cp_switch *cs = switch_stack;
2411 location_t switch_location;
2413 /* Emit warnings as needed. */
2414 if (EXPR_HAS_LOCATION (cs->switch_stmt))
2415 switch_location = EXPR_LOCATION (cs->switch_stmt);
2417 switch_location = input_location;
2418 if (!processing_template_decl)
2419 c_do_switch_warnings (cs->cases, switch_location,
2420 SWITCH_STMT_TYPE (cs->switch_stmt),
2421 SWITCH_STMT_COND (cs->switch_stmt));
2423 splay_tree_delete (cs->cases);
2424 switch_stack = switch_stack->next;
2428 /* Note that we've seen a definition of a case label, and complain if this
2429 is a bad place for one. */
2432 finish_case_label (tree low_value, tree high_value)
2435 struct cp_binding_level *p;
2437 if (processing_template_decl)
2441 /* For templates, just add the case label; we'll do semantic
2442 analysis at instantiation-time. */
2443 label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
2444 return add_stmt (build_case_label (low_value, high_value, label));
2447 /* Find the condition on which this switch statement depends. */
2448 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
2449 if (cond && TREE_CODE (cond) == TREE_LIST)
2450 cond = TREE_VALUE (cond);
2452 r = c_add_case_label (switch_stack->cases, cond, TREE_TYPE (cond),
2453 low_value, high_value);
2455 check_switch_goto (switch_stack->level);
2457 /* After labels, make any new cleanups in the function go into their
2458 own new (temporary) binding contour. */
2459 for (p = current_binding_level;
2460 p->kind != sk_function_parms;
2462 p->more_cleanups_ok = 0;
2467 /* Hash a TYPENAME_TYPE. K is really of type `tree'. */
2470 typename_hash (const void* k)
2475 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
2476 ^ htab_hash_pointer (DECL_NAME (TYPE_NAME (t))));
2481 typedef struct typename_info {
2489 /* Compare two TYPENAME_TYPEs. K1 and K2 are really of type `tree'. */
2492 typename_compare (const void * k1, const void * k2)
2495 const typename_info *t2;
2498 t2 = (const typename_info *) k2;
2500 return (DECL_NAME (TYPE_NAME (t1)) == t2->name
2501 && TYPE_CONTEXT (t1) == t2->scope
2502 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
2503 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
2504 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
2507 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
2508 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
2510 Returns the new TYPENAME_TYPE. */
2512 static GTY ((param_is (union tree_node))) htab_t typename_htab;
2515 build_typename_type (tree context, tree name, tree fullname,
2516 enum tag_types tag_type)
2524 if (typename_htab == NULL)
2525 typename_htab = htab_create_ggc (61, &typename_hash,
2526 &typename_compare, NULL);
2528 ti.scope = FROB_CONTEXT (context);
2530 ti.template_id = fullname;
2531 ti.enum_p = tag_type == enum_type;
2532 ti.class_p = (tag_type == class_type
2533 || tag_type == record_type
2534 || tag_type == union_type);
2535 hash = (htab_hash_pointer (ti.scope)
2536 ^ htab_hash_pointer (ti.name));
2538 /* See if we already have this type. */
2539 e = htab_find_slot_with_hash (typename_htab, &ti, hash, INSERT);
2544 /* Build the TYPENAME_TYPE. */
2545 t = make_aggr_type (TYPENAME_TYPE);
2546 TYPE_CONTEXT (t) = ti.scope;
2547 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
2548 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
2549 TYPENAME_IS_CLASS_P (t) = ti.class_p;
2551 /* Build the corresponding TYPE_DECL. */
2552 d = build_decl (TYPE_DECL, name, t);
2553 TYPE_NAME (TREE_TYPE (d)) = d;
2554 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
2555 DECL_CONTEXT (d) = FROB_CONTEXT (context);
2556 DECL_ARTIFICIAL (d) = 1;
2558 /* Store it in the hash table. */
2565 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
2566 provided to name the type. Returns an appropriate type, unless an
2567 error occurs, in which case error_mark_node is returned. If we
2568 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
2569 return that, rather than the _TYPE it corresponds to, in other
2570 cases we look through the type decl. If TF_ERROR is set, complain
2571 about errors, otherwise be quiet. */
2574 make_typename_type (tree context, tree name, enum tag_types tag_type,
2575 tsubst_flags_t complain)
2579 if (name == error_mark_node
2580 || context == NULL_TREE
2581 || context == error_mark_node)
2582 return error_mark_node;
2586 if (!(TYPE_LANG_SPECIFIC (name)
2587 && (CLASSTYPE_IS_TEMPLATE (name)
2588 || CLASSTYPE_USE_TEMPLATE (name))))
2589 name = TYPE_IDENTIFIER (name);
2591 /* Create a TEMPLATE_ID_EXPR for the type. */
2592 name = build_nt (TEMPLATE_ID_EXPR,
2593 CLASSTYPE_TI_TEMPLATE (name),
2594 CLASSTYPE_TI_ARGS (name));
2596 else if (TREE_CODE (name) == TYPE_DECL)
2597 name = DECL_NAME (name);
2601 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
2603 name = TREE_OPERAND (name, 0);
2604 if (TREE_CODE (name) == TEMPLATE_DECL)
2605 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
2607 if (TREE_CODE (name) == TEMPLATE_DECL)
2609 error ("%qD used without template parameters", name);
2610 return error_mark_node;
2612 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
2613 gcc_assert (TYPE_P (context));
2615 if (!dependent_type_p (context)
2616 || currently_open_class (context))
2618 if (TREE_CODE (fullname) == TEMPLATE_ID_EXPR)
2620 tree tmpl = NULL_TREE;
2621 if (IS_AGGR_TYPE (context))
2622 tmpl = lookup_field (context, name, 0, false);
2623 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
2625 if (complain & tf_error)
2626 error ("no class template named %q#T in %q#T",
2628 return error_mark_node;
2631 if (complain & tf_error)
2632 perform_or_defer_access_check (TYPE_BINFO (context), tmpl);
2634 return lookup_template_class (tmpl,
2635 TREE_OPERAND (fullname, 1),
2637 /*entering_scope=*/0,
2638 tf_error | tf_warning | tf_user);
2644 if (!IS_AGGR_TYPE (context))
2646 if (complain & tf_error)
2647 error ("no type named %q#T in %q#T", name, context);
2648 return error_mark_node;
2651 t = lookup_field (context, name, 0, true);
2654 if (TREE_CODE (t) != TYPE_DECL)
2656 if (complain & tf_error)
2657 error ("no type named %q#T in %q#T", name, context);
2658 return error_mark_node;
2661 if (complain & tf_error)
2662 perform_or_defer_access_check (TYPE_BINFO (context), t);
2664 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
2672 /* If the CONTEXT is not a template type, then either the field is
2673 there now or its never going to be. */
2674 if (!dependent_type_p (context))
2676 if (complain & tf_error)
2677 error ("no type named %q#T in %q#T", name, context);
2678 return error_mark_node;
2681 return build_typename_type (context, name, fullname, tag_type);
2684 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
2685 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
2686 in which case error_mark_node is returned.
2688 If PARM_LIST is non-NULL, also make sure that the template parameter
2689 list of TEMPLATE_DECL matches.
2691 If COMPLAIN zero, don't complain about any errors that occur. */
2694 make_unbound_class_template (tree context, tree name, tree parm_list,
2695 tsubst_flags_t complain)
2701 name = TYPE_IDENTIFIER (name);
2702 else if (DECL_P (name))
2703 name = DECL_NAME (name);
2704 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
2706 if (!dependent_type_p (context)
2707 || currently_open_class (context))
2709 tree tmpl = NULL_TREE;
2711 if (IS_AGGR_TYPE (context))
2712 tmpl = lookup_field (context, name, 0, false);
2714 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
2716 if (complain & tf_error)
2717 error ("no class template named %q#T in %q#T", name, context);
2718 return error_mark_node;
2722 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
2724 if (complain & tf_error)
2726 error ("template parameters do not match template");
2727 error ("%q+D declared here", tmpl);
2729 return error_mark_node;
2732 if (complain & tf_error)
2733 perform_or_defer_access_check (TYPE_BINFO (context), tmpl);
2738 /* Build the UNBOUND_CLASS_TEMPLATE. */
2739 t = make_aggr_type (UNBOUND_CLASS_TEMPLATE);
2740 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
2741 TREE_TYPE (t) = NULL_TREE;
2743 /* Build the corresponding TEMPLATE_DECL. */
2744 d = build_decl (TEMPLATE_DECL, name, t);
2745 TYPE_NAME (TREE_TYPE (d)) = d;
2746 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
2747 DECL_CONTEXT (d) = FROB_CONTEXT (context);
2748 DECL_ARTIFICIAL (d) = 1;
2749 DECL_TEMPLATE_PARMS (d) = parm_list;
2756 /* Push the declarations of builtin types into the namespace.
2757 RID_INDEX is the index of the builtin type in the array
2758 RID_POINTERS. NAME is the name used when looking up the builtin
2759 type. TYPE is the _TYPE node for the builtin type. */
2762 record_builtin_type (enum rid rid_index,
2766 tree rname = NULL_TREE, tname = NULL_TREE;
2767 tree tdecl = NULL_TREE;
2769 if ((int) rid_index < (int) RID_MAX)
2770 rname = ridpointers[(int) rid_index];
2772 tname = get_identifier (name);
2774 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
2775 eliminated. Built-in types should not be looked up name; their
2776 names are keywords that the parser can recognize. However, there
2777 is code in c-common.c that uses identifier_global_value to look
2778 up built-in types by name. */
2781 tdecl = build_decl (TYPE_DECL, tname, type);
2782 DECL_ARTIFICIAL (tdecl) = 1;
2783 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
2789 tdecl = build_decl (TYPE_DECL, rname, type);
2790 DECL_ARTIFICIAL (tdecl) = 1;
2792 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
2795 if (!TYPE_NAME (type))
2796 TYPE_NAME (type) = tdecl;
2799 debug_hooks->type_decl (tdecl, 0);
2802 /* Record one of the standard Java types.
2803 * Declare it as having the given NAME.
2804 * If SIZE > 0, it is the size of one of the integral types;
2805 * otherwise it is the negative of the size of one of the other types. */
2808 record_builtin_java_type (const char* name, int size)
2812 type = make_signed_type (size);
2813 else if (size > -32)
2814 { /* "__java_char" or ""__java_boolean". */
2815 type = make_unsigned_type (-size);
2816 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
2819 { /* "__java_float" or ""__java_double". */
2820 type = make_node (REAL_TYPE);
2821 TYPE_PRECISION (type) = - size;
2824 record_builtin_type (RID_MAX, name, type);
2825 decl = TYPE_NAME (type);
2827 /* Suppress generate debug symbol entries for these types,
2828 since for normal C++ they are just clutter.
2829 However, push_lang_context undoes this if extern "Java" is seen. */
2830 DECL_IGNORED_P (decl) = 1;
2832 TYPE_FOR_JAVA (type) = 1;
2836 /* Push a type into the namespace so that the back-ends ignore it. */
2839 record_unknown_type (tree type, const char* name)
2841 tree decl = pushdecl (build_decl (TYPE_DECL, get_identifier (name), type));
2842 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
2843 DECL_IGNORED_P (decl) = 1;
2844 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
2845 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
2846 TYPE_ALIGN (type) = 1;
2847 TYPE_USER_ALIGN (type) = 0;
2848 TYPE_MODE (type) = TYPE_MODE (void_type_node);
2851 /* A string for which we should create an IDENTIFIER_NODE at
2854 typedef struct predefined_identifier
2856 /* The name of the identifier. */
2857 const char *const name;
2858 /* The place where the IDENTIFIER_NODE should be stored. */
2860 /* Nonzero if this is the name of a constructor or destructor. */
2861 const int ctor_or_dtor_p;
2862 } predefined_identifier;
2864 /* Create all the predefined identifiers. */
2867 initialize_predefined_identifiers (void)
2869 const predefined_identifier *pid;
2871 /* A table of identifiers to create at startup. */
2872 static const predefined_identifier predefined_identifiers[] = {
2873 { "C++", &lang_name_cplusplus, 0 },
2874 { "C", &lang_name_c, 0 },
2875 { "Java", &lang_name_java, 0 },
2876 /* Some of these names have a trailing space so that it is
2877 impossible for them to conflict with names written by users. */
2878 { "__ct ", &ctor_identifier, 1 },
2879 { "__base_ctor ", &base_ctor_identifier, 1 },
2880 { "__comp_ctor ", &complete_ctor_identifier, 1 },
2881 { "__dt ", &dtor_identifier, 1 },
2882 { "__comp_dtor ", &complete_dtor_identifier, 1 },
2883 { "__base_dtor ", &base_dtor_identifier, 1 },
2884 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
2885 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
2886 { "nelts", &nelts_identifier, 0 },
2887 { THIS_NAME, &this_identifier, 0 },
2888 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
2889 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
2890 { "_vptr", &vptr_identifier, 0 },
2891 { "__vtt_parm", &vtt_parm_identifier, 0 },
2892 { "::", &global_scope_name, 0 },
2893 { "std", &std_identifier, 0 },
2897 for (pid = predefined_identifiers; pid->name; ++pid)
2899 *pid->node = get_identifier (pid->name);
2900 if (pid->ctor_or_dtor_p)
2901 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
2905 /* Create the predefined scalar types of C,
2906 and some nodes representing standard constants (0, 1, (void *)0).
2907 Initialize the global binding level.
2908 Make definitions for built-in primitive functions. */
2911 cxx_init_decl_processing (void)
2914 tree void_ftype_ptr;
2916 build_common_tree_nodes (flag_signed_char, false);
2918 /* Create all the identifiers we need. */
2919 initialize_predefined_identifiers ();
2921 /* Create the global variables. */
2922 push_to_top_level ();
2924 current_function_decl = NULL_TREE;
2925 current_binding_level = NULL;
2926 /* Enter the global namespace. */
2927 gcc_assert (global_namespace == NULL_TREE);
2928 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
2930 begin_scope (sk_namespace, global_namespace);
2932 current_lang_name = NULL_TREE;
2934 /* Adjust various flags based on command-line settings. */
2935 if (!flag_permissive)
2936 flag_pedantic_errors = 1;
2937 if (!flag_no_inline)
2939 flag_inline_trees = 1;
2942 if (flag_inline_functions)
2943 flag_inline_trees = 2;
2945 /* Force minimum function alignment if using the least significant
2946 bit of function pointers to store the virtual bit. */
2947 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
2948 && force_align_functions_log < 1)
2949 force_align_functions_log = 1;
2952 current_lang_name = lang_name_c;
2954 error_mark_list = build_tree_list (error_mark_node, error_mark_node);
2955 TREE_TYPE (error_mark_list) = error_mark_node;
2957 /* Create the `std' namespace. */
2958 push_namespace (std_identifier);
2959 std_node = current_namespace;
2962 c_common_nodes_and_builtins ();
2964 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
2965 java_short_type_node = record_builtin_java_type ("__java_short", 16);
2966 java_int_type_node = record_builtin_java_type ("__java_int", 32);
2967 java_long_type_node = record_builtin_java_type ("__java_long", 64);
2968 java_float_type_node = record_builtin_java_type ("__java_float", -32);
2969 java_double_type_node = record_builtin_java_type ("__java_double", -64);
2970 java_char_type_node = record_builtin_java_type ("__java_char", -16);
2971 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
2973 integer_two_node = build_int_cst (NULL_TREE, 2);
2974 integer_three_node = build_int_cst (NULL_TREE, 3);
2976 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
2977 truthvalue_type_node = boolean_type_node;
2978 truthvalue_false_node = boolean_false_node;
2979 truthvalue_true_node = boolean_true_node;
2981 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
2984 record_builtin_type (RID_MAX, NULL, string_type_node);
2987 delta_type_node = ptrdiff_type_node;
2988 vtable_index_type = ptrdiff_type_node;
2990 vtt_parm_type = build_pointer_type (const_ptr_type_node);
2991 void_ftype = build_function_type (void_type_node, void_list_node);
2992 void_ftype_ptr = build_function_type (void_type_node,
2993 tree_cons (NULL_TREE,
2997 = build_exception_variant (void_ftype_ptr, empty_except_spec);
2999 /* C++ extensions */
3001 unknown_type_node = make_node (UNKNOWN_TYPE);
3002 record_unknown_type (unknown_type_node, "unknown type");
3004 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3005 TREE_TYPE (unknown_type_node) = unknown_type_node;
3007 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3009 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
3010 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
3013 /* Make sure we get a unique function type, so we can give
3014 its pointer type a name. (This wins for gdb.) */
3015 tree vfunc_type = make_node (FUNCTION_TYPE);
3016 TREE_TYPE (vfunc_type) = integer_type_node;
3017 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
3018 layout_type (vfunc_type);
3020 vtable_entry_type = build_pointer_type (vfunc_type);
3022 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
3025 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
3026 layout_type (vtbl_type_node);
3027 vtbl_type_node = build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
3028 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
3029 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
3030 layout_type (vtbl_ptr_type_node);
3031 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
3033 push_namespace (get_identifier ("__cxxabiv1"));
3034 abi_node = current_namespace;
3037 global_type_node = make_node (LANG_TYPE);
3038 record_unknown_type (global_type_node, "global type");
3041 current_lang_name = lang_name_cplusplus;
3045 tree bad_alloc_type_node;
3046 tree bad_alloc_decl;
3047 tree newtype, deltype;
3048 tree ptr_ftype_sizetype;
3050 push_namespace (std_identifier);
3051 bad_alloc_id = get_identifier ("bad_alloc");
3052 bad_alloc_type_node = make_aggr_type (RECORD_TYPE);
3053 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3055 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3056 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3057 TYPE_STUB_DECL (bad_alloc_type_node) = bad_alloc_decl;
3061 = build_function_type (ptr_type_node,
3062 tree_cons (NULL_TREE,
3065 newtype = build_exception_variant
3066 (ptr_ftype_sizetype, add_exception_specifier
3067 (NULL_TREE, bad_alloc_type_node, -1));
3068 deltype = build_exception_variant (void_ftype_ptr, empty_except_spec);
3069 push_cp_library_fn (NEW_EXPR, newtype);
3070 push_cp_library_fn (VEC_NEW_EXPR, newtype);
3071 global_delete_fndecl = push_cp_library_fn (DELETE_EXPR, deltype);
3072 push_cp_library_fn (VEC_DELETE_EXPR, deltype);
3076 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype);
3078 /* Perform other language dependent initializations. */
3079 init_class_processing ();
3080 init_rtti_processing ();
3082 if (flag_exceptions)
3083 init_exception_processing ();
3085 if (! supports_one_only ())
3088 make_fname_decl = cp_make_fname_decl;
3089 start_fname_decls ();
3091 /* Show we use EH for cleanups. */
3092 if (flag_exceptions)
3093 using_eh_for_cleanups ();
3096 /* Generate an initializer for a function naming variable from
3097 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
3098 filled in with the type of the init. */
3101 cp_fname_init (const char* name, tree *type_p)
3103 tree domain = NULL_TREE;
3105 tree init = NULL_TREE;
3110 length = strlen (name);
3111 domain = build_index_type (size_int (length));
3112 init = build_string (length + 1, name);
3115 type = build_qualified_type (char_type_node, TYPE_QUAL_CONST);
3116 type = build_cplus_array_type (type, domain);
3121 TREE_TYPE (init) = type;
3123 init = error_mark_node;
3128 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
3129 decl, NAME is the initialization string and TYPE_DEP indicates whether
3130 NAME depended on the type of the function. We make use of that to detect
3131 __PRETTY_FUNCTION__ inside a template fn. This is being done
3132 lazily at the point of first use, so we mustn't push the decl now. */
3135 cp_make_fname_decl (tree id, int type_dep)
3137 const char *const name = (type_dep && processing_template_decl
3138 ? NULL : fname_as_string (type_dep));
3140 tree init = cp_fname_init (name, &type);
3141 tree decl = build_decl (VAR_DECL, id, type);
3144 free ((char *) name);
3146 /* As we're using pushdecl_with_scope, we must set the context. */
3147 DECL_CONTEXT (decl) = current_function_decl;
3148 DECL_PRETTY_FUNCTION_P (decl) = type_dep;
3150 TREE_STATIC (decl) = 1;
3151 TREE_READONLY (decl) = 1;
3152 DECL_ARTIFICIAL (decl) = 1;
3153 DECL_INITIAL (decl) = init;
3155 TREE_USED (decl) = 1;
3157 if (current_function_decl)
3159 struct cp_binding_level *b = current_binding_level;
3160 while (b->level_chain->kind != sk_function_parms)
3162 pushdecl_with_scope (decl, b, /*is_friend=*/false);
3163 cp_finish_decl (decl, init, NULL_TREE, LOOKUP_ONLYCONVERTING);
3166 pushdecl_top_level_and_finish (decl, init);
3171 /* Make a definition for a builtin function named NAME in the current
3172 namespace, whose data type is TYPE and whose context is CONTEXT.
3173 TYPE should be a function type with argument types.
3175 CLASS and CODE tell later passes how to compile calls to this function.
3176 See tree.h for possible values.
3178 If LIBNAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3179 the name to be called if we can't opencode the function.
3180 If ATTRS is nonzero, use that for the function's attribute
3184 builtin_function_1 (const char* name,
3187 enum built_in_function code,
3188 enum built_in_class class,
3189 const char* libname,
3192 tree decl = build_library_fn_1 (get_identifier (name), ERROR_MARK, type);
3193 DECL_BUILT_IN_CLASS (decl) = class;
3194 DECL_FUNCTION_CODE (decl) = code;
3195 DECL_CONTEXT (decl) = context;
3199 /* Since `pushdecl' relies on DECL_ASSEMBLER_NAME instead of DECL_NAME,
3200 we cannot change DECL_ASSEMBLER_NAME until we have installed this
3201 function in the namespace. */
3203 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (libname));
3205 /* A function in the user's namespace should have an explicit
3206 declaration before it is used. Mark the built-in function as
3207 anticipated but not actually declared. */
3208 if (name[0] != '_' || name[1] != '_')
3209 DECL_ANTICIPATED (decl) = 1;
3211 /* Possibly apply some default attributes to this built-in function. */
3213 decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
3215 decl_attributes (&decl, NULL_TREE, 0);
3220 /* Entry point for the benefit of c_common_nodes_and_builtins.
3222 Make a definition for a builtin function named NAME and whose data type
3223 is TYPE. TYPE should be a function type with argument types. This
3224 function places the anticipated declaration in the global namespace
3225 and additionally in the std namespace if appropriate.
3227 CLASS and CODE tell later passes how to compile calls to this function.
3228 See tree.h for possible values.
3230 If LIBNAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3231 the name to be called if we can't opencode the function.
3233 If ATTRS is nonzero, use that for the function's attribute
3237 builtin_function (const char* name,
3240 enum built_in_class cl,
3241 const char* libname,
3244 /* All builtins that don't begin with an '_' should additionally
3245 go in the 'std' namespace. */
3248 push_namespace (std_identifier);
3249 builtin_function_1 (name, type, std_node, code, cl, libname, attrs);
3253 return builtin_function_1 (name, type, NULL_TREE, code,
3254 cl, libname, attrs);
3257 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
3258 function. Not called directly. */
3261 build_library_fn_1 (tree name, enum tree_code operator_code, tree type)
3263 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
3264 DECL_EXTERNAL (fn) = 1;
3265 TREE_PUBLIC (fn) = 1;
3266 DECL_ARTIFICIAL (fn) = 1;
3267 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
3268 SET_DECL_LANGUAGE (fn, lang_c);
3269 /* Runtime library routines are, by definition, available in an
3270 external shared object. */
3271 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
3272 DECL_VISIBILITY_SPECIFIED (fn) = 1;
3276 /* Returns the _DECL for a library function with C linkage.
3277 We assume that such functions never throw; if this is incorrect,
3278 callers should unset TREE_NOTHROW. */
3281 build_library_fn (tree name, tree type)
3283 tree fn = build_library_fn_1 (name, ERROR_MARK, type);
3284 TREE_NOTHROW (fn) = 1;
3288 /* Returns the _DECL for a library function with C++ linkage. */
3291 build_cp_library_fn (tree name, enum tree_code operator_code, tree type)
3293 tree fn = build_library_fn_1 (name, operator_code, type);
3294 TREE_NOTHROW (fn) = TYPE_NOTHROW_P (type);
3295 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
3296 SET_DECL_LANGUAGE (fn, lang_cplusplus);
3300 /* Like build_library_fn, but takes a C string instead of an
3304 build_library_fn_ptr (const char* name, tree type)
3306 return build_library_fn (get_identifier (name), type);
3309 /* Like build_cp_library_fn, but takes a C string instead of an
3313 build_cp_library_fn_ptr (const char* name, tree type)
3315 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type);
3318 /* Like build_library_fn, but also pushes the function so that we will
3319 be able to find it via IDENTIFIER_GLOBAL_VALUE. */
3322 push_library_fn (tree name, tree type)
3324 tree fn = build_library_fn (name, type);
3325 pushdecl_top_level (fn);
3329 /* Like build_cp_library_fn, but also pushes the function so that it
3330 will be found by normal lookup. */
3333 push_cp_library_fn (enum tree_code operator_code, tree type)
3335 tree fn = build_cp_library_fn (ansi_opname (operator_code),
3342 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
3346 push_void_library_fn (tree name, tree parmtypes)
3348 tree type = build_function_type (void_type_node, parmtypes);
3349 return push_library_fn (name, type);
3352 /* Like push_library_fn, but also note that this function throws
3353 and does not return. Used for __throw_foo and the like. */
3356 push_throw_library_fn (tree name, tree type)
3358 tree fn = push_library_fn (name, type);
3359 TREE_THIS_VOLATILE (fn) = 1;
3360 TREE_NOTHROW (fn) = 0;
3364 /* When we call finish_struct for an anonymous union, we create
3365 default copy constructors and such. But, an anonymous union
3366 shouldn't have such things; this function undoes the damage to the
3367 anonymous union type T.
3369 (The reason that we create the synthesized methods is that we don't
3370 distinguish `union { int i; }' from `typedef union { int i; } U'.
3371 The first is an anonymous union; the second is just an ordinary
3375 fixup_anonymous_aggr (tree t)
3379 /* Wipe out memory of synthesized methods. */
3380 TYPE_HAS_CONSTRUCTOR (t) = 0;
3381 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
3382 TYPE_HAS_INIT_REF (t) = 0;
3383 TYPE_HAS_CONST_INIT_REF (t) = 0;
3384 TYPE_HAS_ASSIGN_REF (t) = 0;
3385 TYPE_HAS_CONST_ASSIGN_REF (t) = 0;
3387 /* Splice the implicitly generated functions out of the TYPE_METHODS
3389 q = &TYPE_METHODS (t);
3392 if (DECL_ARTIFICIAL (*q))
3393 *q = TREE_CHAIN (*q);
3395 q = &TREE_CHAIN (*q);
3398 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
3399 if (TYPE_METHODS (t))
3400 error ("%Jan anonymous union cannot have function members",
3401 TYPE_MAIN_DECL (t));
3403 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
3404 assignment operators (because they cannot have these methods themselves).
3405 For anonymous unions this is already checked because they are not allowed
3406 in any union, otherwise we have to check it. */
3407 if (TREE_CODE (t) != UNION_TYPE)
3411 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
3412 if (TREE_CODE (field) == FIELD_DECL)
3414 type = TREE_TYPE (field);
3415 if (CLASS_TYPE_P (type))
3417 if (TYPE_NEEDS_CONSTRUCTING (type))
3418 error ("member %q+#D with constructor not allowed "
3419 "in anonymous aggregate", field);
3420 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
3421 error ("member %q+#D with destructor not allowed "
3422 "in anonymous aggregate", field);
3423 if (TYPE_HAS_COMPLEX_ASSIGN_REF (type))
3424 error ("member %q+#D with copy assignment operator "
3425 "not allowed in anonymous aggregate", field);
3431 /* Make sure that a declaration with no declarator is well-formed, i.e.
3432 just declares a tagged type or anonymous union.
3434 Returns the type declared; or NULL_TREE if none. */
3437 check_tag_decl (cp_decl_specifier_seq *declspecs)
3439 int saw_friend = declspecs->specs[(int)ds_friend] != 0;
3440 int saw_typedef = declspecs->specs[(int)ds_typedef] != 0;
3441 /* If a class, struct, or enum type is declared by the DECLSPECS
3442 (i.e, if a class-specifier, enum-specifier, or non-typename
3443 elaborated-type-specifier appears in the DECLSPECS),
3444 DECLARED_TYPE is set to the corresponding type. */
3445 tree declared_type = NULL_TREE;
3446 bool error_p = false;
3448 if (declspecs->multiple_types_p)
3449 error ("multiple types in one declaration");
3450 else if (declspecs->redefined_builtin_type)
3452 if (!in_system_header)
3453 pedwarn ("redeclaration of C++ built-in type %qT",
3454 declspecs->redefined_builtin_type);
3459 && TYPE_P (declspecs->type)
3460 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
3461 && IS_AGGR_TYPE (declspecs->type))
3462 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
3463 declared_type = declspecs->type;
3464 else if (declspecs->type == error_mark_node)
3466 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
3467 pedwarn ("declaration does not declare anything");
3468 /* Check for an anonymous union. */
3469 else if (declared_type && IS_AGGR_TYPE_CODE (TREE_CODE (declared_type))
3470 && TYPE_ANONYMOUS_P (declared_type))
3472 /* 7/3 In a simple-declaration, the optional init-declarator-list
3473 can be omitted only when declaring a class (clause 9) or
3474 enumeration (7.2), that is, when the decl-specifier-seq contains
3475 either a class-specifier, an elaborated-type-specifier with
3476 a class-key (9.1), or an enum-specifier. In these cases and
3477 whenever a class-specifier or enum-specifier is present in the
3478 decl-specifier-seq, the identifiers in these specifiers are among
3479 the names being declared by the declaration (as class-name,
3480 enum-names, or enumerators, depending on the syntax). In such
3481 cases, and except for the declaration of an unnamed bit-field (9.6),
3482 the decl-specifier-seq shall introduce one or more names into the
3483 program, or shall redeclare a name introduced by a previous
3484 declaration. [Example:
3485 enum { }; // ill-formed
3486 typedef class { }; // ill-formed
3490 error ("missing type-name in typedef-declaration");
3493 /* Anonymous unions are objects, so they can have specifiers. */;
3494 SET_ANON_AGGR_TYPE_P (declared_type);
3496 if (TREE_CODE (declared_type) != UNION_TYPE && pedantic
3497 && !in_system_header)
3498 pedwarn ("ISO C++ prohibits anonymous structs");
3503 if (declspecs->specs[(int)ds_inline]
3504 || declspecs->specs[(int)ds_virtual])
3505 error ("%qs can only be specified for functions",
3506 declspecs->specs[(int)ds_inline]
3507 ? "inline" : "virtual");
3509 && (!current_class_type
3510 || current_scope () != current_class_type))
3511 error ("%<friend%> can only be specified inside a class");
3512 else if (declspecs->specs[(int)ds_explicit])
3513 error ("%<explicit%> can only be specified for constructors");
3514 else if (declspecs->storage_class)
3515 error ("a storage class can only be specified for objects "
3517 else if (declspecs->specs[(int)ds_const]
3518 || declspecs->specs[(int)ds_volatile]
3519 || declspecs->specs[(int)ds_restrict]
3520 || declspecs->specs[(int)ds_thread])
3521 error ("qualifiers can only be specified for objects "
3525 return declared_type;
3528 /* Called when a declaration is seen that contains no names to declare.
3529 If its type is a reference to a structure, union or enum inherited
3530 from a containing scope, shadow that tag name for the current scope
3531 with a forward reference.
3532 If its type defines a new named structure or union
3533 or defines an enum, it is valid but we need not do anything here.
3534 Otherwise, it is an error.
3536 C++: may have to grok the declspecs to learn about static,
3537 complain for anonymous unions.
3539 Returns the TYPE declared -- or NULL_TREE if none. */
3542 shadow_tag (cp_decl_specifier_seq *declspecs)
3544 tree t = check_tag_decl (declspecs);
3549 if (declspecs->attributes)
3551 warning (0, "attribute ignored in declaration of %q+#T", t);
3552 warning (0, "attribute for %q+#T must follow the %qs keyword",
3553 t, class_key_or_enum_as_string (t));
3557 maybe_process_partial_specialization (t);
3559 /* This is where the variables in an anonymous union are
3560 declared. An anonymous union declaration looks like:
3562 because there is no declarator after the union, the parser
3563 sends that declaration here. */
3564 if (ANON_AGGR_TYPE_P (t))
3566 fixup_anonymous_aggr (t);
3568 if (TYPE_FIELDS (t))
3570 tree decl = grokdeclarator (/*declarator=*/NULL,
3571 declspecs, NORMAL, 0, NULL);
3572 finish_anon_union (decl);
3579 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3582 groktypename (cp_decl_specifier_seq *type_specifiers,
3583 const cp_declarator *declarator)
3587 attrs = type_specifiers->attributes;
3588 type_specifiers->attributes = NULL_TREE;
3589 type = grokdeclarator (declarator, type_specifiers, TYPENAME, 0, &attrs);
3591 cplus_decl_attributes (&type, attrs, 0);
3595 /* Decode a declarator in an ordinary declaration or data definition.
3596 This is called as soon as the type information and variable name
3597 have been parsed, before parsing the initializer if any.
3598 Here we create the ..._DECL node, fill in its type,
3599 and put it on the list of decls for the current context.
3600 The ..._DECL node is returned as the value.
3602 Exception: for arrays where the length is not specified,
3603 the type is left null, to be filled in by `cp_finish_decl'.
3605 Function definitions do not come here; they go to start_function
3606 instead. However, external and forward declarations of functions
3607 do go through here. Structure field declarations are done by
3608 grokfield and not through here. */
3611 start_decl (const cp_declarator *declarator,
3612 cp_decl_specifier_seq *declspecs,
3615 tree prefix_attributes,
3616 tree *pushed_scope_p)
3622 *pushed_scope_p = NULL_TREE;
3624 /* This should only be done once on the top most decl. */
3625 if (have_extern_spec)
3627 declspecs->storage_class = sc_extern;
3628 have_extern_spec = false;
3631 /* An object declared as __attribute__((deprecated)) suppresses
3632 warnings of uses of other deprecated items. */
3633 if (lookup_attribute ("deprecated", attributes))
3634 deprecated_state = DEPRECATED_SUPPRESS;
3636 attributes = chainon (attributes, prefix_attributes);
3638 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
3641 deprecated_state = DEPRECATED_NORMAL;
3643 if (decl == NULL_TREE || TREE_CODE (decl) == VOID_TYPE
3644 || decl == error_mark_node)
3645 return error_mark_node;
3647 type = TREE_TYPE (decl);
3649 context = DECL_CONTEXT (decl);
3653 *pushed_scope_p = push_scope (context);
3655 /* We are only interested in class contexts, later. */
3656 if (TREE_CODE (context) == NAMESPACE_DECL)
3657 context = NULL_TREE;
3661 /* Is it valid for this decl to have an initializer at all?
3662 If not, set INITIALIZED to zero, which will indirectly
3663 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
3664 switch (TREE_CODE (decl))
3667 error ("typedef %qD is initialized (use __typeof__ instead)", decl);
3672 error ("function %q#D is initialized like a variable", decl);
3682 if (! toplevel_bindings_p ()
3683 && DECL_EXTERNAL (decl))
3684 warning (0, "declaration of %q#D has %<extern%> and is initialized",
3686 DECL_EXTERNAL (decl) = 0;
3687 if (toplevel_bindings_p ())
3688 TREE_STATIC (decl) = 1;
3690 /* Tell `pushdecl' this is an initialized decl
3691 even though we don't yet have the initializer expression.
3692 Also tell `cp_finish_decl' it may store the real initializer. */
3693 DECL_INITIAL (decl) = error_mark_node;
3696 /* Set attributes here so if duplicate decl, will have proper attributes. */
3697 cplus_decl_attributes (&decl, attributes, 0);
3699 /* If #pragma weak was used, mark the decl weak now. */
3700 maybe_apply_pragma_weak (decl);
3702 if (TREE_CODE (decl) == FUNCTION_DECL
3703 && DECL_DECLARED_INLINE_P (decl)
3704 && DECL_UNINLINABLE (decl)
3705 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
3706 warning (0, "inline function %q+D given attribute noinline", decl);
3708 if (context && COMPLETE_TYPE_P (complete_type (context)))
3710 if (TREE_CODE (decl) == VAR_DECL)
3712 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
3713 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
3714 error ("%q#D is not a static member of %q#T", decl, context);
3717 if (DECL_CONTEXT (field) != context)
3719 if (!same_type_p (DECL_CONTEXT (field), context))
3720 pedwarn ("ISO C++ does not permit %<%T::%D%> "
3721 "to be defined as %<%T::%D%>",
3722 DECL_CONTEXT (field), DECL_NAME (decl),
3723 context, DECL_NAME (decl));
3724 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
3726 if (processing_specialization
3727 && template_class_depth (context) == 0
3728 && CLASSTYPE_TEMPLATE_SPECIALIZATION (context))
3729 error ("template header not allowed in member definition "
3730 "of explicitly specialized class");
3731 /* Static data member are tricky; an in-class initialization
3732 still doesn't provide a definition, so the in-class
3733 declaration will have DECL_EXTERNAL set, but will have an
3734 initialization. Thus, duplicate_decls won't warn
3735 about this situation, and so we check here. */
3736 if (DECL_INITIAL (decl)
3737 && DECL_INITIALIZED_IN_CLASS_P (field))
3738 error ("duplicate initialization of %qD", decl);
3739 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
3745 tree field = check_classfn (context, decl,
3746 (processing_template_decl
3747 > template_class_depth (context))
3748 ? current_template_parms
3750 if (field && duplicate_decls (decl, field,
3751 /*newdecl_is_friend=*/false))
3755 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
3756 DECL_IN_AGGR_P (decl) = 0;
3757 /* Do not mark DECL as an explicit specialization if it was not
3758 already marked as an instantiation; a declaration should
3759 never be marked as a specialization unless we know what
3760 template is being specialized. */
3761 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
3763 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
3765 /* [temp.expl.spec] An explicit specialization of a static data
3766 member of a template is a definition if the declaration
3767 includes an initializer; otherwise, it is a declaration.
3769 We check for processing_specialization so this only applies
3770 to the new specialization syntax. */
3771 if (!DECL_INITIAL (decl)
3772 && processing_specialization)
3773 DECL_EXTERNAL (decl) = 1;
3776 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl))
3777 pedwarn ("declaration of %q#D outside of class is not definition",
3781 /* Enter this declaration into the symbol table. */
3782 tem = maybe_push_decl (decl);
3784 if (processing_template_decl)
3785 tem = push_template_decl (tem);
3786 if (tem == error_mark_node)
3787 return error_mark_node;
3789 #if ! defined (ASM_OUTPUT_BSS) && ! defined (ASM_OUTPUT_ALIGNED_BSS)
3790 /* Tell the back-end to use or not use .common as appropriate. If we say
3791 -fconserve-space, we want this to save .data space, at the expense of
3792 wrong semantics. If we say -fno-conserve-space, we want this to
3793 produce errors about redefs; to do this we force variables into the
3795 DECL_COMMON (tem) = ((TREE_CODE (tem) != VAR_DECL
3796 || !DECL_THREAD_LOCAL_P (tem))
3797 && (flag_conserve_space || ! TREE_PUBLIC (tem)));
3800 if (! processing_template_decl)
3807 start_decl_1 (tree decl)
3809 tree type = TREE_TYPE (decl);
3810 int initialized = (DECL_INITIAL (decl) != NULL_TREE);
3812 if (type == error_mark_node)
3816 /* Is it valid for this decl to have an initializer at all?
3817 If not, set INITIALIZED to zero, which will indirectly
3818 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
3820 /* Don't allow initializations for incomplete types except for
3821 arrays which might be completed by the initialization. */
3822 if (COMPLETE_TYPE_P (complete_type (type)))
3823 ; /* A complete type is ok. */
3824 else if (TREE_CODE (type) != ARRAY_TYPE)
3826 error ("variable %q#D has initializer but incomplete type", decl);
3828 type = TREE_TYPE (decl) = error_mark_node;
3830 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
3832 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
3833 error ("elements of array %q#D have incomplete type", decl);
3834 /* else we already gave an error in start_decl. */
3840 && TREE_CODE (decl) != TYPE_DECL
3841 && TREE_CODE (decl) != TEMPLATE_DECL
3842 && type != error_mark_node
3843 && IS_AGGR_TYPE (type)
3844 && ! DECL_EXTERNAL (decl))
3846 if ((! processing_template_decl || ! uses_template_parms (type))
3847 && !COMPLETE_TYPE_P (complete_type (type)))
3849 error ("aggregate %q#D has incomplete type and cannot be defined",
3851 /* Change the type so that assemble_variable will give
3852 DECL an rtl we can live with: (mem (const_int 0)). */
3853 type = TREE_TYPE (decl) = error_mark_node;
3857 /* If any base type in the hierarchy of TYPE needs a constructor,
3858 then we set initialized to 1. This way any nodes which are
3859 created for the purposes of initializing this aggregate
3860 will live as long as it does. This is necessary for global
3861 aggregates which do not have their initializers processed until
3862 the end of the file. */
3863 initialized = TYPE_NEEDS_CONSTRUCTING (type);
3868 DECL_INITIAL (decl) = NULL_TREE;
3870 /* Create a new scope to hold this declaration if necessary.
3871 Whether or not a new scope is necessary cannot be determined
3872 until after the type has been completed; if the type is a
3873 specialization of a class template it is not until after
3874 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
3875 will be set correctly. */
3876 maybe_push_cleanup_level (type);
3879 /* Handle initialization of references. DECL, TYPE, and INIT have the
3880 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
3881 but will be set to a new CLEANUP_STMT if a temporary is created
3882 that must be destroyed subsequently.
3884 Returns an initializer expression to use to initialize DECL, or
3885 NULL if the initialization can be performed statically.
3887 Quotes on semantics can be found in ARM 8.4.3. */
3890 grok_reference_init (tree decl, tree type, tree init, tree *cleanup)
3894 if (init == NULL_TREE)
3896 if ((DECL_LANG_SPECIFIC (decl) == 0
3897 || DECL_IN_AGGR_P (decl) == 0)
3898 && ! DECL_THIS_EXTERN (decl))
3899 error ("%qD declared as reference but not initialized", decl);
3903 if (TREE_CODE (init) == CONSTRUCTOR)
3905 error ("ISO C++ forbids use of initializer list to "
3906 "initialize reference %qD", decl);
3910 if (TREE_CODE (init) == TREE_LIST)
3911 init = build_x_compound_expr_from_list (init, "initializer");
3913 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
3914 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
3915 /* Note: default conversion is only called in very special cases. */
3916 init = decay_conversion (init);
3918 /* Convert INIT to the reference type TYPE. This may involve the
3919 creation of a temporary, whose lifetime must be the same as that
3920 of the reference. If so, a DECL_EXPR for the temporary will be
3921 added just after the DECL_EXPR for DECL. That's why we don't set
3922 DECL_INITIAL for local references (instead assigning to them
3923 explicitly); we need to allow the temporary to be initialized
3925 tmp = initialize_reference (type, init, decl, cleanup);
3927 if (tmp == error_mark_node)
3929 else if (tmp == NULL_TREE)
3931 error ("cannot initialize %qT from %qT", type, TREE_TYPE (init));
3935 if (TREE_STATIC (decl) && !TREE_CONSTANT (tmp))
3938 DECL_INITIAL (decl) = tmp;
3943 /* When parsing `int a[] = {1, 2};' we don't know the size of the
3944 array until we finish parsing the initializer. If that's the
3945 situation we're in, update DECL accordingly. */
3948 maybe_deduce_size_from_array_init (tree decl, tree init)
3950 tree type = TREE_TYPE (decl);
3952 if (TREE_CODE (type) == ARRAY_TYPE
3953 && TYPE_DOMAIN (type) == NULL_TREE
3954 && TREE_CODE (decl) != TYPE_DECL)
3956 /* do_default is really a C-ism to deal with tentative definitions.
3957 But let's leave it here to ease the eventual merge. */
3958 int do_default = !DECL_EXTERNAL (decl);
3959 tree initializer = init ? init : DECL_INITIAL (decl);
3960 int failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
3964 error ("initializer fails to determine size of %qD", decl);
3969 error ("array size missing in %qD", decl);
3970 /* If a `static' var's size isn't known, make it extern as
3971 well as static, so it does not get allocated. If it's not
3972 `static', then don't mark it extern; finish_incomplete_decl
3973 will give it a default size and it will get allocated. */
3974 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
3975 DECL_EXTERNAL (decl) = 1;
3979 error ("zero-size array %qD", decl);
3981 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
3983 layout_decl (decl, 0);
3987 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
3988 any appropriate error messages regarding the layout. */
3991 layout_var_decl (tree decl)
3993 tree type = TREE_TYPE (decl);
3995 /* If we haven't already layed out this declaration, do so now.
3996 Note that we must not call complete type for an external object
3997 because it's type might involve templates that we are not
3998 supposed to instantiate yet. (And it's perfectly valid to say
3999 `extern X x' for some incomplete type `X'.) */
4000 if (!DECL_EXTERNAL (decl))
4001 complete_type (type);
4002 if (!DECL_SIZE (decl)
4003 && TREE_TYPE (decl) != error_mark_node
4004 && (COMPLETE_TYPE_P (type)
4005 || (TREE_CODE (type) == ARRAY_TYPE
4006 && !TYPE_DOMAIN (type)
4007 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
4008 layout_decl (decl, 0);
4010 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
4012 /* An automatic variable with an incomplete type: that is an error.
4013 Don't talk about array types here, since we took care of that
4014 message in grokdeclarator. */
4015 error ("storage size of %qD isn't known", decl);
4016 TREE_TYPE (decl) = error_mark_node;
4019 /* Keep this code around in case we later want to control debug info
4020 based on whether a type is "used". (jason 1999-11-11) */
4022 else if (!DECL_EXTERNAL (decl) && IS_AGGR_TYPE (ttype))
4023 /* Let debugger know it should output info for this type. */
4024 note_debug_info_needed (ttype);
4026 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4027 note_debug_info_needed (DECL_CONTEXT (decl));
4030 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4031 && DECL_SIZE (decl) != NULL_TREE
4032 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4034 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4035 constant_expression_warning (DECL_SIZE (decl));
4037 error ("storage size of %qD isn't constant", decl);
4040 if (TREE_STATIC (decl)
4041 && !DECL_ARTIFICIAL (decl)
4042 && current_function_decl
4043 && DECL_CONTEXT (decl) == current_function_decl)
4044 push_local_name (decl);
4047 /* If a local static variable is declared in an inline function, or if
4048 we have a weak definition, we must endeavor to create only one
4049 instance of the variable at link-time. */
4052 maybe_commonize_var (tree decl)
4054 /* Static data in a function with comdat linkage also has comdat
4056 if (TREE_STATIC (decl)
4057 /* Don't mess with __FUNCTION__. */
4058 && ! DECL_ARTIFICIAL (decl)
4059 && DECL_FUNCTION_SCOPE_P (decl)
4060 /* Unfortunately, import_export_decl has not always been called
4061 before the function is processed, so we cannot simply check
4063 && (DECL_COMDAT (DECL_CONTEXT (decl))
4064 || ((DECL_DECLARED_INLINE_P (DECL_CONTEXT (decl))
4065 || DECL_TEMPLATE_INSTANTIATION (DECL_CONTEXT (decl)))
4066 && TREE_PUBLIC (DECL_CONTEXT (decl)))))
4070 /* With weak symbols, we simply make the variable COMDAT;
4071 that will cause copies in multiple translations units to
4073 comdat_linkage (decl);
4077 if (DECL_INITIAL (decl) == NULL_TREE
4078 || DECL_INITIAL (decl) == error_mark_node)
4080 /* Without weak symbols, we can use COMMON to merge
4081 uninitialized variables. */
4082 TREE_PUBLIC (decl) = 1;
4083 DECL_COMMON (decl) = 1;
4087 /* While for initialized variables, we must use internal
4088 linkage -- which means that multiple copies will not
4090 TREE_PUBLIC (decl) = 0;
4091 DECL_COMMON (decl) = 0;
4092 warning (0, "sorry: semantics of inline function static "
4093 "data %q+#D are wrong (you'll wind up "
4094 "with multiple copies)", decl);
4095 warning (0, "%J you can work around this by removing "
4101 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4102 /* Set it up again; we might have set DECL_INITIAL since the last
4104 comdat_linkage (decl);
4107 /* Issue an error message if DECL is an uninitialized const variable. */
4110 check_for_uninitialized_const_var (tree decl)
4112 tree type = TREE_TYPE (decl);
4114 /* ``Unless explicitly declared extern, a const object does not have
4115 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4117 if (TREE_CODE (decl) == VAR_DECL
4118 && TREE_CODE (type) != REFERENCE_TYPE
4119 && CP_TYPE_CONST_P (type)
4120 && !TYPE_NEEDS_CONSTRUCTING (type)
4121 && !DECL_INITIAL (decl))
4122 error ("uninitialized const %qD", decl);
4126 /* Structure holding the current initializer being processed by reshape_init.
4127 CUR is a pointer to the current element being processed, END is a pointer
4128 after the last element present in the initializer. */
4129 typedef struct reshape_iterator_t
4131 constructor_elt *cur;
4132 constructor_elt *end;
4135 static tree reshape_init_r (tree, reshape_iter *, bool);
4137 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4138 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4139 initialized. If there are no more such fields, the return value
4143 next_initializable_field (tree field)
4146 && (TREE_CODE (field) != FIELD_DECL
4147 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4148 || DECL_ARTIFICIAL (field)))
4149 field = TREE_CHAIN (field);
4154 /* Subroutine of reshape_init_array and reshape_init_vector, which does
4155 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
4156 INTEGER_CST representing the size of the array minus one (the maximum index),
4157 or NULL_TREE if the array was declared without specifying the size. D is
4158 the iterator within the constructor. */
4161 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d)
4164 bool sized_array_p = (max_index != NULL_TREE);
4165 unsigned HOST_WIDE_INT max_index_cst = 0;
4166 unsigned HOST_WIDE_INT index;
4168 /* The initializer for an array is always a CONSTRUCTOR. */
4169 new_init = build_constructor (NULL_TREE, NULL);
4173 if (host_integerp (max_index, 1))
4174 max_index_cst = tree_low_cst (max_index, 1);
4175 /* sizetype is sign extended, not zero extended. */
4177 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
4181 /* Loop until there are no more initializers. */
4183 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
4190 /* Handle array designated initializers (GNU extension). */
4191 if (TREE_CODE (d->cur->index) == IDENTIFIER_NODE)
4193 error ("name %qD used in a GNU-style designated "
4194 "initializer for an array", d->cur->index);
4200 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false);
4201 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), NULL_TREE, elt_init);
4207 /* Subroutine of reshape_init_r, processes the initializers for arrays.
4208 Parameters are the same of reshape_init_r. */
4211 reshape_init_array (tree type, reshape_iter *d)
4213 tree max_index = NULL_TREE;
4215 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
4217 if (TYPE_DOMAIN (type))
4218 max_index = array_type_nelts (type);
4220 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4223 /* Subroutine of reshape_init_r, processes the initializers for vectors.
4224 Parameters are the same of reshape_init_r. */
4227 reshape_init_vector (tree type, reshape_iter *d)
4229 tree max_index = NULL_TREE;
4232 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
4234 if (TREE_CODE (d->cur->value) == CONSTRUCTOR
4235 && TREE_HAS_CONSTRUCTOR (d->cur->value))
4237 tree value = d->cur->value;
4238 if (!same_type_p (TREE_TYPE (value), type))
4240 error ("invalid type %qT as initializer for a vector of type %qT",
4241 TREE_TYPE (d->cur->value), type);
4242 value = error_mark_node;
4248 /* For a vector, the representation type is a struct
4249 containing a single member which is an array of the
4250 appropriate size. */
4251 rtype = TYPE_DEBUG_REPRESENTATION_TYPE (type);
4252 if (rtype && TYPE_DOMAIN (TREE_TYPE (TYPE_FIELDS (rtype))))
4253 max_index = array_type_nelts (TREE_TYPE (TYPE_FIELDS (rtype)));
4255 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4258 /* Subroutine of reshape_init_r, processes the initializers for classes
4259 or union. Parameters are the same of reshape_init_r. */
4262 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p)
4267 gcc_assert (CLASS_TYPE_P (type));
4269 /* The initializer for a class is always a CONSTRUCTOR. */
4270 new_init = build_constructor (NULL_TREE, NULL);
4271 field = next_initializable_field (TYPE_FIELDS (type));
4277 An initializer for an aggregate member that is an
4278 empty class shall have the form of an empty
4279 initializer-list {}. */
4280 if (!first_initializer_p)
4282 error ("initializer for %qT must be brace-enclosed", type);
4283 return error_mark_node;
4288 /* Loop through the initializable fields, gathering initializers. */
4289 while (d->cur != d->end)
4293 /* Handle designated initializers, as an extension. */
4297 pedwarn ("ISO C++ does not allow designated initializers");
4299 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
4301 if (!field || TREE_CODE (field) != FIELD_DECL)
4302 error ("%qT has no non-static data member named %qD", type,
4306 /* If we processed all the member of the class, we are done. */
4310 field_init = reshape_init_r (TREE_TYPE (field), d,
4311 /*first_initializer_p=*/false);
4312 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
4316 When a union is initialized with a brace-enclosed
4317 initializer, the braces shall only contain an
4318 initializer for the first member of the union. */
4319 if (TREE_CODE (type) == UNION_TYPE)
4322 field = next_initializable_field (TREE_CHAIN (field));
4328 /* Subroutine of reshape_init, which processes a single initializer (part of
4329 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
4330 iterator within the CONSTRUCTOR which points to the initializer to process.
4331 FIRST_INITIALIZER_P is true if this is the first initializer of the
4332 CONSTRUCTOR node. */
4335 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p)
4337 tree init = d->cur->value;
4339 /* A non-aggregate type is always initialized with a single
4341 if (!CP_AGGREGATE_TYPE_P (type))
4343 /* It is invalid to initialize a non-aggregate type with a
4344 brace-enclosed initializer.
4345 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
4346 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
4347 a CONSTRUCTOR (with a record type). */
4348 if (TREE_CODE (init) == CONSTRUCTOR
4349 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
4351 error ("braces around scalar initializer for type %qT", type);
4352 init = error_mark_node;
4361 All implicit type conversions (clause _conv_) are considered when
4362 initializing the aggregate member with an initializer from an
4363 initializer-list. If the initializer can initialize a member,
4364 the member is initialized. Otherwise, if the member is itself a
4365 non-empty subaggregate, brace elision is assumed and the
4366 initializer is considered for the initialization of the first
4367 member of the subaggregate. */
4368 if (TREE_CODE (init) != CONSTRUCTOR
4369 && can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL))
4375 /* [dcl.init.string]
4377 A char array (whether plain char, signed char, or unsigned char)
4378 can be initialized by a string-literal (optionally enclosed in
4379 braces); a wchar_t array can be initialized by a wide
4380 string-literal (optionally enclosed in braces). */
4381 if (TREE_CODE (type) == ARRAY_TYPE
4382 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
4384 tree str_init = init;
4386 /* Strip one level of braces if and only if they enclose a single
4387 element (as allowed by [dcl.init.string]). */
4388 if (!first_initializer_p
4389 && TREE_CODE (str_init) == CONSTRUCTOR
4390 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (str_init)) == 1)
4392 str_init = VEC_index (constructor_elt,
4393 CONSTRUCTOR_ELTS (str_init), 0)->value;
4396 /* If it's a string literal, then it's the initializer for the array
4397 as a whole. Otherwise, continue with normal initialization for
4398 array types (one value per array element). */
4399 if (TREE_CODE (str_init) == STRING_CST)
4406 /* The following cases are about aggregates. If we are not within a full
4407 initializer already, and there is not a CONSTRUCTOR, it means that there
4408 is a missing set of braces (that is, we are processing the case for
4409 which reshape_init exists). */
4410 if (!first_initializer_p)
4412 if (TREE_CODE (init) == CONSTRUCTOR)
4414 /* For a nested compound literal, there is no need to reshape since
4415 brace elision is not allowed. Even if we decided to allow it,
4416 we should add a call to reshape_init in finish_compound_literal,
4417 before calling digest_init, so changing this code would still
4418 not be necessary. */
4419 if (!TREE_HAS_CONSTRUCTOR (init))
4422 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
4423 return reshape_init (type, init);
4426 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
4429 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
4433 /* Dispatch to specialized routines. */
4434 if (CLASS_TYPE_P (type))
4435 return reshape_init_class (type, d, first_initializer_p);
4436 else if (TREE_CODE (type) == ARRAY_TYPE)
4437 return reshape_init_array (type, d);
4438 else if (TREE_CODE (type) == VECTOR_TYPE)
4439 return reshape_init_vector (type, d);
4444 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
4445 brace-enclosed aggregate initializer.
4447 INIT is the CONSTRUCTOR containing the list of initializers describing
4448 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
4449 It may not presently match the shape of the TYPE; for example:
4451 struct S { int a; int b; };
4452 struct S a[] = { 1, 2, 3, 4 };
4454 Here INIT will hold a VEC of four elements, rather than a
4455 VEC of two elements, each itself a VEC of two elements. This
4456 routine transforms INIT from the former form into the latter. The
4457 revised CONSTRUCTOR node is returned. */
4460 reshape_init (tree type, tree init)
4462 VEC(constructor_elt, gc) *v;
4466 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
4467 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
4469 v = CONSTRUCTOR_ELTS (init);
4471 /* An empty constructor does not need reshaping, and it is always a valid
4473 if (VEC_empty (constructor_elt, v))
4476 /* Recurse on this CONSTRUCTOR. */
4477 d.cur = VEC_index (constructor_elt, v, 0);
4478 d.end = d.cur + VEC_length (constructor_elt, v);
4480 new_init = reshape_init_r (type, &d, true);
4482 /* Make sure all the element of the constructor were used. Otherwise,
4483 issue an error about exceeding initializers. */
4485 error ("too many initializers for %qT", type);
4490 /* Verify INIT (the initializer for DECL), and record the
4491 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
4492 grok_reference_init.
4494 If the return value is non-NULL, it is an expression that must be
4495 evaluated dynamically to initialize DECL. */
4498 check_initializer (tree decl, tree init, int flags, tree *cleanup)
4500 tree type = TREE_TYPE (decl);
4501 tree init_code = NULL;
4503 /* If `start_decl' didn't like having an initialization, ignore it now. */
4504 if (init != NULL_TREE && DECL_INITIAL (decl) == NULL_TREE)
4507 /* If an initializer is present, DECL_INITIAL has been
4508 error_mark_node, to indicate that an as-of-yet unevaluated
4509 initialization will occur. From now on, DECL_INITIAL reflects
4510 the static initialization -- if any -- of DECL. */
4511 DECL_INITIAL (decl) = NULL_TREE;
4513 /* Things that are going to be initialized need to have complete
4515 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
4517 if (type == error_mark_node)
4518 /* We will have already complained. */
4520 else if (init && COMPLETE_TYPE_P (type)
4521 && !TREE_CONSTANT (TYPE_SIZE (type)))
4523 error ("variable-sized object %qD may not be initialized", decl);
4526 else if (TREE_CODE (type) == ARRAY_TYPE
4527 && !COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4529 error ("elements of array %q#D have incomplete type", decl);
4532 else if (TREE_CODE (type) != ARRAY_TYPE && !COMPLETE_TYPE_P (type))
4534 error ("%qD has incomplete type", decl);
4535 TREE_TYPE (decl) = error_mark_node;
4539 if (TREE_CODE (decl) == CONST_DECL)
4541 gcc_assert (TREE_CODE (decl) != REFERENCE_TYPE);
4543 DECL_INITIAL (decl) = init;
4545 gcc_assert (init != NULL_TREE);
4548 else if (!DECL_EXTERNAL (decl) && TREE_CODE (type) == REFERENCE_TYPE)
4549 init = grok_reference_init (decl, type, init, cleanup);
4552 /* Do not reshape constructors of vectors (they don't need to be
4554 if (TREE_CODE (init) == CONSTRUCTOR
4555 && !TREE_HAS_CONSTRUCTOR (init)
4556 && !TREE_TYPE (init)) /* ptrmemfunc */
4558 init = reshape_init (type, init);
4560 if ((*targetm.vector_opaque_p) (type))
4562 error ("opaque vector types cannot be initialized");
4563 init = error_mark_node;
4567 /* If DECL has an array type without a specific bound, deduce the
4568 array size from the initializer. */
4569 maybe_deduce_size_from_array_init (decl, init);
4570 type = TREE_TYPE (decl);
4572 if (TYPE_HAS_CONSTRUCTOR (type) || TYPE_NEEDS_CONSTRUCTING (type))
4574 if (TREE_CODE (type) == ARRAY_TYPE)
4575 goto initialize_aggr;
4576 else if (TREE_CODE (init) == CONSTRUCTOR)
4578 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
4579 if (TYPE_NON_AGGREGATE_CLASS (type))
4581 error ("%qD must be initialized by constructor, "
4584 init = error_mark_node;
4587 goto dont_use_constructor;
4591 int saved_stmts_are_full_exprs_p;
4594 saved_stmts_are_full_exprs_p = 0;
4595 if (building_stmt_tree ())
4597 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
4598 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
4600 init = build_aggr_init (decl, init, flags);
4601 if (building_stmt_tree ())
4602 current_stmt_tree ()->stmts_are_full_exprs_p =
4603 saved_stmts_are_full_exprs_p;
4609 dont_use_constructor:
4610 if (TREE_CODE (init) != TREE_VEC)
4612 init_code = store_init_value (decl, init);
4613 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
4614 && DECL_INITIAL (decl)
4615 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
4616 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
4617 warning (0, "array %qD initialized by parenthesized string literal %qE",
4618 decl, DECL_INITIAL (decl));
4623 else if (DECL_EXTERNAL (decl))
4625 else if (TYPE_P (type) && TYPE_NEEDS_CONSTRUCTING (type))
4626 goto initialize_aggr;
4627 else if (IS_AGGR_TYPE (type))
4629 tree core_type = strip_array_types (type);
4631 if (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type))
4632 error ("structure %qD with uninitialized const members", decl);
4633 if (CLASSTYPE_REF_FIELDS_NEED_INIT (core_type))
4634 error ("structure %qD with uninitialized reference members", decl);
4636 check_for_uninitialized_const_var (decl);
4639 check_for_uninitialized_const_var (decl);
4641 if (init && init != error_mark_node)
4642 init_code = build2 (INIT_EXPR, type, decl, init);
4647 /* If DECL is not a local variable, give it RTL. */
4650 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
4652 int toplev = toplevel_bindings_p ();
4654 const char *filename;
4656 /* Set the DECL_ASSEMBLER_NAME for the object. */
4659 /* The `register' keyword, when used together with an
4660 asm-specification, indicates that the variable should be
4661 placed in a particular register. */
4662 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
4664 set_user_assembler_name (decl, asmspec);
4665 DECL_HARD_REGISTER (decl) = 1;
4669 if (TREE_CODE (decl) == FUNCTION_DECL
4670 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
4671 set_builtin_user_assembler_name (decl, asmspec);
4672 set_user_assembler_name (decl, asmspec);
4676 /* Handle non-variables up front. */
4677 if (TREE_CODE (decl) != VAR_DECL)
4679 rest_of_decl_compilation (decl, toplev, at_eof);
4683 /* If we see a class member here, it should be a static data
4685 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
4687 gcc_assert (TREE_STATIC (decl));
4688 /* An in-class declaration of a static data member should be
4689 external; it is only a declaration, and not a definition. */
4690 if (init == NULL_TREE)
4691 gcc_assert (DECL_EXTERNAL (decl));
4694 /* We don't create any RTL for local variables. */
4695 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
4698 /* We defer emission of local statics until the corresponding
4699 DECL_EXPR is expanded. */
4700 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
4702 /* We try to defer namespace-scope static constants so that they are
4703 not emitted into the object file unnecessarily. */
4704 filename = input_filename;
4705 if (!DECL_VIRTUAL_P (decl)
4706 && TREE_READONLY (decl)
4707 && DECL_INITIAL (decl) != NULL_TREE
4708 && DECL_INITIAL (decl) != error_mark_node
4710 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
4712 && !TREE_PUBLIC (decl))
4714 /* Fool with the linkage of static consts according to #pragma
4716 struct c_fileinfo *finfo = get_fileinfo (lbasename (filename));
4717 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
4719 TREE_PUBLIC (decl) = 1;
4720 DECL_EXTERNAL (decl) = finfo->interface_only;
4725 /* Likewise for template instantiations. */
4726 else if (DECL_LANG_SPECIFIC (decl)
4727 && DECL_IMPLICIT_INSTANTIATION (decl))
4730 /* If we're not deferring, go ahead and assemble the variable. */
4732 rest_of_decl_compilation (decl, toplev, at_eof);
4735 /* Generate code to initialize DECL (a local variable). */
4738 initialize_local_var (tree decl, tree init)
4740 tree type = TREE_TYPE (decl);
4743 gcc_assert (TREE_CODE (decl) == VAR_DECL
4744 || TREE_CODE (decl) == RESULT_DECL);
4745 gcc_assert (!TREE_STATIC (decl));
4747 if (DECL_SIZE (decl) == NULL_TREE)
4749 /* If we used it already as memory, it must stay in memory. */
4750 DECL_INITIAL (decl) = NULL_TREE;
4751 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
4754 if (DECL_SIZE (decl) && type != error_mark_node)
4758 /* Compute and store the initial value. */
4759 already_used = TREE_USED (decl) || TREE_USED (type);
4761 /* Perform the initialization. */
4764 int saved_stmts_are_full_exprs_p;
4766 gcc_assert (building_stmt_tree ());
4767 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
4768 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
4769 finish_expr_stmt (init);
4770 current_stmt_tree ()->stmts_are_full_exprs_p =
4771 saved_stmts_are_full_exprs_p;
4774 /* Set this to 0 so we can tell whether an aggregate which was
4775 initialized was ever used. Don't do this if it has a
4776 destructor, so we don't complain about the 'resource
4777 allocation is initialization' idiom. Now set
4778 attribute((unused)) on types so decls of that type will be
4779 marked used. (see TREE_USED, above.) */
4780 if (TYPE_NEEDS_CONSTRUCTING (type)
4782 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
4783 && DECL_NAME (decl))
4784 TREE_USED (decl) = 0;
4785 else if (already_used)
4786 TREE_USED (decl) = 1;
4789 /* Generate a cleanup, if necessary. */
4790 cleanup = cxx_maybe_build_cleanup (decl);
4791 if (DECL_SIZE (decl) && cleanup)
4792 finish_decl_cleanup (decl, cleanup);
4795 /* DECL is a VAR_DECL for a compiler-generated variable with static
4796 storage duration (like a virtual table) whose initializer is a
4797 compile-time constant. Initialize the variable and provide it to
4801 initialize_artificial_var (tree decl, tree init)
4803 DECL_INITIAL (decl) = build_constructor_from_list (NULL_TREE, init);
4804 DECL_INITIALIZED_P (decl) = 1;
4805 determine_visibility (decl);
4806 layout_var_decl (decl);
4807 maybe_commonize_var (decl);
4808 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
4811 /* Finish processing of a declaration;
4812 install its line number and initial value.
4813 If the length of an array type is not known before,
4814 it must be determined now, from the initial value, or it is an error.
4816 INIT holds the value of an initializer that should be allowed to escape
4819 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
4820 if the (init) syntax was used. */
4823 cp_finish_decl (tree decl, tree init, tree asmspec_tree, int flags)
4827 const char *asmspec = NULL;
4828 int was_readonly = 0;
4829 bool var_definition_p = false;
4831 if (decl == error_mark_node)
4836 error ("assignment (not initialization) in declaration");
4840 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
4842 /* Assume no cleanup is required. */
4843 cleanup = NULL_TREE;
4845 /* If a name was specified, get the string. */
4846 if (global_scope_p (current_binding_level))
4847 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
4849 asmspec = TREE_STRING_POINTER (asmspec_tree);
4851 if (init && TREE_CODE (init) == NAMESPACE_DECL)
4853 error ("cannot initialize %qD to namespace %qD", decl, init);
4857 if (current_class_type
4858 && CP_DECL_CONTEXT (decl) == current_class_type
4859 && TYPE_BEING_DEFINED (current_class_type)
4860 && (DECL_INITIAL (decl) || init))
4861 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
4863 type = TREE_TYPE (decl);
4865 if (type == error_mark_node)
4868 if (processing_template_decl)
4870 /* Add this declaration to the statement-tree. */
4871 if (at_function_scope_p ())
4872 add_decl_expr (decl);
4874 if (init && DECL_INITIAL (decl))
4875 DECL_INITIAL (decl) = init;
4876 if (TREE_CODE (decl) == VAR_DECL
4877 && !DECL_PRETTY_FUNCTION_P (decl)
4878 && !dependent_type_p (TREE_TYPE (decl)))
4879 maybe_deduce_size_from_array_init (decl, init);
4884 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
4885 gcc_assert (TREE_CODE (decl) != PARM_DECL);
4887 /* Take care of TYPE_DECLs up front. */
4888 if (TREE_CODE (decl) == TYPE_DECL)
4890 if (type != error_mark_node
4891 && IS_AGGR_TYPE (type) && DECL_NAME (decl))
4893 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
4894 warning (0, "shadowing previous type declaration of %q#D", decl);
4895 set_identifier_type_value (DECL_NAME (decl), decl);
4898 /* If we have installed this as the canonical typedef for this
4899 type, and that type has not been defined yet, delay emitting
4900 the debug information for it, as we will emit it later. */
4901 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
4902 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
4903 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
4905 rest_of_decl_compilation (decl, DECL_CONTEXT (decl) == NULL_TREE,
4910 /* A reference will be modified here, as it is initialized. */
4911 if (! DECL_EXTERNAL (decl)
4912 && TREE_READONLY (decl)
4913 && TREE_CODE (type) == REFERENCE_TYPE)
4916 TREE_READONLY (decl) = 0;
4919 if (TREE_CODE (decl) == VAR_DECL)
4921 /* Only PODs can have thread-local storage. Other types may require
4922 various kinds of non-trivial initialization. */
4923 if (DECL_THREAD_LOCAL_P (decl) && !pod_type_p (TREE_TYPE (decl)))
4924 error ("%qD cannot be thread-local because it has non-POD type %qT",
4925 decl, TREE_TYPE (decl));
4926 /* Convert the initializer to the type of DECL, if we have not
4927 already initialized DECL. */
4928 if (!DECL_INITIALIZED_P (decl)
4929 /* If !DECL_EXTERNAL then DECL is being defined. In the
4930 case of a static data member initialized inside the
4931 class-specifier, there can be an initializer even if DECL
4932 is *not* defined. */
4933 && (!DECL_EXTERNAL (decl) || init))
4936 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
4937 init = check_initializer (decl, init, flags, &cleanup);
4938 /* Thread-local storage cannot be dynamically initialized. */
4939 if (DECL_THREAD_LOCAL_P (decl) && init)
4941 error ("%qD is thread-local and so cannot be dynamically "
4942 "initialized", decl);
4946 /* Check that the initializer for a static data member was a
4947 constant. Although we check in the parser that the
4948 initializer is an integral constant expression, we do not
4949 simplify division-by-zero at the point at which it
4950 occurs. Therefore, in:
4952 struct S { static const int i = 7 / 0; };
4954 we issue an error at this point. It would
4955 probably be better to forbid division by zero in
4956 integral constant expressions. */
4957 if (DECL_EXTERNAL (decl) && init)
4959 error ("%qD cannot be initialized by a non-constant expression"
4960 " when being declared", decl);
4961 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
4969 The memory occupied by any object of static storage
4970 duration is zero-initialized at program startup before
4971 any other initialization takes place.
4973 We cannot create an appropriate initializer until after
4974 the type of DECL is finalized. If DECL_INITIAL is set,
4975 then the DECL is statically initialized, and any
4976 necessary zero-initialization has already been performed. */
4977 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
4978 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
4979 /*nelts=*/NULL_TREE,
4980 /*static_storage_p=*/true);
4981 /* Remember that the initialization for this variable has
4983 DECL_INITIALIZED_P (decl) = 1;
4984 /* This declaration is the definition of this variable,
4985 unless we are initializing a static data member within
4986 the class specifier. */
4987 if (!DECL_EXTERNAL (decl))
4988 var_definition_p = true;
4989 /* The variable is being defined, so determine its
4991 determine_visibility (decl);
4993 /* If the variable has an array type, lay out the type, even if
4994 there is no initializer. It is valid to index through the
4995 array, and we must get TYPE_ALIGN set correctly on the array
4997 else if (TREE_CODE (type) == ARRAY_TYPE)
5001 /* Add this declaration to the statement-tree. This needs to happen
5002 after the call to check_initializer so that the DECL_EXPR for a
5003 reference temp is added before the DECL_EXPR for the reference itself. */
5004 if (at_function_scope_p ())
5005 add_decl_expr (decl);
5007 if (TREE_CODE (decl) == VAR_DECL)
5008 layout_var_decl (decl);
5010 /* Output the assembler code and/or RTL code for variables and functions,
5011 unless the type is an undefined structure or union.
5012 If not, it will get done when the type is completed. */
5013 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
5015 if (TREE_CODE (decl) == VAR_DECL)
5016 maybe_commonize_var (decl);
5018 make_rtl_for_nonlocal_decl (decl, init, asmspec);
5020 /* Check for abstractness of the type. Notice that there is no
5021 need to strip array types here since the check for those types
5022 is already done within create_array_type_for_decl. */
5023 if (TREE_CODE (type) == FUNCTION_TYPE
5024 || TREE_CODE (type) == METHOD_TYPE)
5025 abstract_virtuals_error (decl, TREE_TYPE (type));
5027 abstract_virtuals_error (decl, type);
5029 if (TREE_CODE (decl) == FUNCTION_DECL
5030 || TREE_TYPE (decl) == error_mark_node)
5031 /* No initialization required. */
5033 else if (DECL_EXTERNAL (decl)
5034 && ! (DECL_LANG_SPECIFIC (decl)
5035 && DECL_NOT_REALLY_EXTERN (decl)))
5038 DECL_INITIAL (decl) = init;
5042 /* A variable definition. */
5043 if (DECL_FUNCTION_SCOPE_P (decl))
5045 /* Initialize the local variable. */
5046 if (processing_template_decl)
5048 if (init || DECL_INITIAL (decl) == error_mark_node)
5049 DECL_INITIAL (decl) = init;
5051 else if (!TREE_STATIC (decl))
5052 initialize_local_var (decl, init);
5055 /* If a variable is defined, and then a subsequent
5056 definition with external linkage is encountered, we will
5057 get here twice for the same variable. We want to avoid
5058 calling expand_static_init more than once. For variables
5059 that are not static data members, we can call
5060 expand_static_init only when we actually process the
5061 initializer. It is not legal to redeclare a static data
5062 member, so this issue does not arise in that case. */
5063 if (var_definition_p && TREE_STATIC (decl))
5064 expand_static_init (decl, init);
5068 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
5069 reference, insert it in the statement-tree now. */
5071 push_cleanup (decl, cleanup, false);
5076 TREE_READONLY (decl) = 1;
5078 /* If this was marked 'used', be sure it will be output. */
5079 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
5080 mark_decl_referenced (decl);
5083 /* This is here for a midend callback from c-common.c. */
5086 finish_decl (tree decl, tree init, tree asmspec_tree)
5088 cp_finish_decl (decl, init, asmspec_tree, 0);
5091 /* Returns a declaration for a VAR_DECL as if:
5093 extern "C" TYPE NAME;
5095 had been seen. Used to create compiler-generated global
5099 declare_global_var (tree name, tree type)
5103 push_to_top_level ();
5104 decl = build_decl (VAR_DECL, name, type);
5105 TREE_PUBLIC (decl) = 1;
5106 DECL_EXTERNAL (decl) = 1;
5107 DECL_ARTIFICIAL (decl) = 1;
5108 /* If the user has explicitly declared this variable (perhaps
5109 because the code we are compiling is part of a low-level runtime
5110 library), then it is possible that our declaration will be merged
5111 with theirs by pushdecl. */
5112 decl = pushdecl (decl);
5113 cp_finish_decl (decl, NULL_TREE, NULL_TREE, 0);
5114 pop_from_top_level ();
5119 /* Returns a pointer to the `atexit' function. Note that if
5120 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
5121 `__cxa_atexit' function specified in the IA64 C++ ABI. */
5124 get_atexit_node (void)
5131 bool use_aeabi_atexit;
5136 if (flag_use_cxa_atexit)
5138 /* The declaration for `__cxa_atexit' is:
5140 int __cxa_atexit (void (*)(void *), void *, void *)
5142 We build up the argument types and then then function type
5145 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
5146 /* First, build the pointer-to-function type for the first
5148 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
5149 fn_type = build_function_type (void_type_node, arg_types);
5150 fn_ptr_type = build_pointer_type (fn_type);
5151 /* Then, build the rest of the argument types. */
5152 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
5153 if (use_aeabi_atexit)
5155 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
5156 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
5160 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
5161 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
5163 /* And the final __cxa_atexit type. */
5164 fn_type = build_function_type (integer_type_node, arg_types);
5165 fn_ptr_type = build_pointer_type (fn_type);
5166 if (use_aeabi_atexit)
5167 name = "__aeabi_atexit";
5169 name = "__cxa_atexit";
5173 /* The declaration for `atexit' is:
5175 int atexit (void (*)());
5177 We build up the argument types and then then function type
5179 fn_type = build_function_type (void_type_node, void_list_node);
5180 fn_ptr_type = build_pointer_type (fn_type);
5181 arg_types = tree_cons (NULL_TREE, fn_ptr_type, void_list_node);
5182 /* Build the final atexit type. */
5183 fn_type = build_function_type (integer_type_node, arg_types);
5187 /* Now, build the function declaration. */
5188 push_lang_context (lang_name_c);
5189 atexit_fndecl = build_library_fn_ptr (name, fn_type);
5190 mark_used (atexit_fndecl);
5191 pop_lang_context ();
5192 atexit_node = decay_conversion (atexit_fndecl);
5197 /* Returns the __dso_handle VAR_DECL. */
5200 get_dso_handle_node (void)
5202 if (dso_handle_node)
5203 return dso_handle_node;
5205 /* Declare the variable. */
5206 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
5209 return dso_handle_node;
5212 /* Begin a new function with internal linkage whose job will be simply
5213 to destroy some particular variable. */
5215 static GTY(()) int start_cleanup_cnt;
5218 start_cleanup_fn (void)
5225 push_to_top_level ();
5227 /* No need to mangle this. */
5228 push_lang_context (lang_name_c);
5230 /* Build the parameter-types. */
5231 parmtypes = void_list_node;
5232 /* Functions passed to __cxa_atexit take an additional parameter.
5233 We'll just ignore it. After we implement the new calling
5234 convention for destructors, we can eliminate the use of
5235 additional cleanup functions entirely in the -fnew-abi case. */
5236 if (flag_use_cxa_atexit)
5237 parmtypes = tree_cons (NULL_TREE, ptr_type_node, parmtypes);
5238 /* Build the function type itself. */
5239 fntype = build_function_type (void_type_node, parmtypes);
5240 /* Build the name of the function. */
5241 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
5242 /* Build the function declaration. */
5243 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
5244 /* It's a function with internal linkage, generated by the
5246 TREE_PUBLIC (fndecl) = 0;
5247 DECL_ARTIFICIAL (fndecl) = 1;
5248 /* Make the function `inline' so that it is only emitted if it is
5249 actually needed. It is unlikely that it will be inlined, since
5250 it is only called via a function pointer, but we avoid unnecessary
5251 emissions this way. */
5252 DECL_INLINE (fndecl) = 1;
5253 DECL_DECLARED_INLINE_P (fndecl) = 1;
5254 DECL_INTERFACE_KNOWN (fndecl) = 1;
5255 /* Build the parameter. */
5256 if (flag_use_cxa_atexit)
5260 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
5261 DECL_CONTEXT (parmdecl) = fndecl;
5262 TREE_USED (parmdecl) = 1;
5263 DECL_ARGUMENTS (fndecl) = parmdecl;
5267 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
5269 pop_lang_context ();
5271 return current_function_decl;
5274 /* Finish the cleanup function begun by start_cleanup_fn. */
5277 end_cleanup_fn (void)
5279 expand_or_defer_fn (finish_function (0));
5281 pop_from_top_level ();
5284 /* Generate code to handle the destruction of DECL, an object with
5285 static storage duration. */
5288 register_dtor_fn (tree decl)
5295 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
5296 return void_zero_node;
5298 /* Call build_cleanup before we enter the anonymous function so that
5299 any access checks will be done relative to the current scope,
5300 rather than the scope of the anonymous function. */
5301 build_cleanup (decl);
5303 /* Now start the function. */
5304 cleanup = start_cleanup_fn ();
5306 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
5307 to the original function, rather than the anonymous one. That
5308 will make the back-end think that nested functions are in use,
5309 which causes confusion. */
5311 push_deferring_access_checks (dk_no_check);
5312 fcall = build_cleanup (decl);
5313 pop_deferring_access_checks ();
5315 /* Create the body of the anonymous function. */
5316 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
5317 finish_expr_stmt (fcall);
5318 finish_compound_stmt (compound_stmt);
5321 /* Call atexit with the cleanup function. */
5322 cxx_mark_addressable (cleanup);
5323 mark_used (cleanup);
5324 cleanup = build_unary_op (ADDR_EXPR, cleanup, 0);
5325 if (flag_use_cxa_atexit)
5327 args = tree_cons (NULL_TREE,
5328 build_unary_op (ADDR_EXPR, get_dso_handle_node (), 0),
5330 if (targetm.cxx.use_aeabi_atexit ())
5332 args = tree_cons (NULL_TREE, cleanup, args);
5333 args = tree_cons (NULL_TREE, null_pointer_node, args);
5337 args = tree_cons (NULL_TREE, null_pointer_node, args);
5338 args = tree_cons (NULL_TREE, cleanup, args);
5342 args = tree_cons (NULL_TREE, cleanup, NULL_TREE);
5343 return build_function_call (get_atexit_node (), args);
5346 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
5347 is its initializer. Generate code to handle the construction
5348 and destruction of DECL. */
5351 expand_static_init (tree decl, tree init)
5353 gcc_assert (TREE_CODE (decl) == VAR_DECL);
5354 gcc_assert (TREE_STATIC (decl));
5356 /* Some variables require no initialization. */
5358 && !TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))
5359 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
5362 if (DECL_FUNCTION_SCOPE_P (decl))
5364 /* Emit code to perform this initialization but once. */
5365 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
5366 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
5367 tree guard, guard_addr, guard_addr_list;
5368 tree acquire_fn, release_fn, abort_fn;
5371 /* Emit code to perform this initialization but once. This code
5374 static <type> guard;
5375 if (!guard.first_byte) {
5376 if (__cxa_guard_acquire (&guard)) {
5379 // Do initialization.
5380 flag = true; __cxa_guard_release (&guard);
5381 // Register variable for destruction at end of program.
5383 if (!flag) __cxa_guard_abort (&guard);
5387 Note that the `flag' variable is only set to 1 *after* the
5388 initialization is complete. This ensures that an exception,
5389 thrown during the construction, will cause the variable to
5390 reinitialized when we pass through this code again, as per:
5394 If the initialization exits by throwing an exception, the
5395 initialization is not complete, so it will be tried again
5396 the next time control enters the declaration.
5398 This process should be thread-safe, too; multiple threads
5399 should not be able to initialize the variable more than
5402 /* Create the guard variable. */
5403 guard = get_guard (decl);
5405 /* This optimization isn't safe on targets with relaxed memory
5406 consistency. On such targets we force synchronization in
5407 __cxa_guard_acquire. */
5408 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
5410 /* Begin the conditional initialization. */
5411 if_stmt = begin_if_stmt ();
5412 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
5413 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
5416 if (flag_threadsafe_statics)
5418 guard_addr = build_address (guard);
5419 guard_addr_list = build_tree_list (NULL_TREE, guard_addr);
5421 acquire_fn = get_identifier ("__cxa_guard_acquire");
5422 release_fn = get_identifier ("__cxa_guard_release");
5423 abort_fn = get_identifier ("__cxa_guard_abort");
5424 if (!get_global_value_if_present (acquire_fn, &acquire_fn))
5426 tree argtypes = tree_cons (NULL_TREE, TREE_TYPE (guard_addr),
5428 tree vfntype = build_function_type (void_type_node, argtypes);
5429 acquire_fn = push_library_fn
5430 (acquire_fn, build_function_type (integer_type_node, argtypes));
5431 release_fn = push_library_fn (release_fn, vfntype);
5432 abort_fn = push_library_fn (abort_fn, vfntype);
5436 release_fn = identifier_global_value (release_fn);
5437 abort_fn = identifier_global_value (abort_fn);
5440 inner_if_stmt = begin_if_stmt ();
5441 finish_if_stmt_cond (build_call (acquire_fn, guard_addr_list),
5444 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
5445 begin = get_target_expr (boolean_false_node);
5446 flag = TARGET_EXPR_SLOT (begin);
5448 TARGET_EXPR_CLEANUP (begin)
5449 = build3 (COND_EXPR, void_type_node, flag,
5451 build_call (abort_fn, guard_addr_list));
5452 CLEANUP_EH_ONLY (begin) = 1;
5454 /* Do the initialization itself. */
5455 init = add_stmt_to_compound (begin, init);
5456 init = add_stmt_to_compound
5457 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
5458 init = add_stmt_to_compound
5459 (init, build_call (release_fn, guard_addr_list));
5462 init = add_stmt_to_compound (init, set_guard (guard));
5464 /* Use atexit to register a function for destroying this static
5466 init = add_stmt_to_compound (init, register_dtor_fn (decl));
5468 finish_expr_stmt (init);
5470 if (flag_threadsafe_statics)
5472 finish_compound_stmt (inner_then_clause);
5473 finish_then_clause (inner_if_stmt);
5474 finish_if_stmt (inner_if_stmt);
5477 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
5479 finish_compound_stmt (then_clause);
5480 finish_then_clause (if_stmt);
5481 finish_if_stmt (if_stmt);
5485 static_aggregates = tree_cons (init, decl, static_aggregates);
5489 /* Make TYPE a complete type based on INITIAL_VALUE.
5490 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
5491 2 if there was no information (in which case assume 0 if DO_DEFAULT),
5492 3 if the initializer list is empty (in pedantic mode). */
5495 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
5498 tree type, elt_type;
5502 /* An array of character type can be initialized from a
5503 brace-enclosed string constant.
5505 FIXME: this code is duplicated from reshape_init. Probably
5506 we should just call reshape_init here? */
5507 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
5508 && TREE_CODE (initial_value) == CONSTRUCTOR
5509 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
5511 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
5512 tree value = VEC_index (constructor_elt, v, 0)->value;
5514 if (TREE_CODE (value) == STRING_CST
5515 && VEC_length (constructor_elt, v) == 1)
5516 initial_value = value;
5520 failure = complete_array_type (ptype, initial_value, do_default);
5522 /* We can create the array before the element type is complete, which
5523 means that we didn't have these two bits set in the original type
5524 either. In completing the type, we are expected to propagate these
5525 bits. See also complete_type which does the same thing for arrays
5528 if (TYPE_DOMAIN (type))
5530 elt_type = TREE_TYPE (type);
5531 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
5532 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
5533 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
5539 /* Return zero if something is declared to be a member of type
5540 CTYPE when in the context of CUR_TYPE. STRING is the error
5541 message to print in that case. Otherwise, quietly return 1. */
5544 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
5546 if (ctype && ctype != cur_type)
5548 if (flags == DTOR_FLAG)
5549 error ("destructor for alien class %qT cannot be a member", ctype);
5551 error ("constructor for alien class %qT cannot be a member", ctype);
5557 /* Subroutine of `grokdeclarator'. */
5559 /* Generate errors possibly applicable for a given set of specifiers.
5560 This is for ARM $7.1.2. */
5563 bad_specifiers (tree object,
5572 error ("%qD declared as a %<virtual%> %s", object, type);
5574 error ("%qD declared as an %<inline%> %s", object, type);
5576 error ("%<const%> and %<volatile%> function specifiers on "
5577 "%qD invalid in %s declaration",
5580 error ("%q+D declared as a friend", object);
5582 && (TREE_CODE (object) == TYPE_DECL
5583 || (!TYPE_PTRFN_P (TREE_TYPE (object))
5584 && !TYPE_REFFN_P (TREE_TYPE (object))
5585 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
5586 error ("%q+D declared with an exception specification", object);
5589 /* DECL is a member function or static data member and is presently
5590 being defined. Check that the definition is taking place in a
5594 check_class_member_definition_namespace (tree decl)
5596 /* These checks only apply to member functions and static data
5598 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
5599 || TREE_CODE (decl) == VAR_DECL);
5600 /* We check for problems with specializations in pt.c in
5601 check_specialization_namespace, where we can issue better
5603 if (processing_specialization)
5605 /* There are no restrictions on the placement of
5606 explicit instantiations. */
5607 if (processing_explicit_instantiation)
5611 A member function definition that appears outside of the
5612 class definition shall appear in a namespace scope enclosing
5613 the class definition.
5617 The definition for a static data member shall appear in a
5618 namespace scope enclosing the member's class definition. */
5619 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
5620 pedwarn ("definition of %qD is not in namespace enclosing %qT",
5621 decl, DECL_CONTEXT (decl));
5624 /* CTYPE is class type, or null if non-class.
5625 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
5627 DECLARATOR is the function's name.
5628 PARMS is a chain of PARM_DECLs for the function.
5629 VIRTUALP is truthvalue of whether the function is virtual or not.
5630 FLAGS are to be passed through to `grokclassfn'.
5631 QUALS are qualifiers indicating whether the function is `const'
5633 RAISES is a list of exceptions that this function can raise.
5634 CHECK is 1 if we must find this method in CTYPE, 0 if we should
5635 not look, and -1 if we should not call `grokclassfn' at all.
5637 SFK is the kind of special function (if any) for the new function.
5639 Returns `NULL_TREE' if something goes wrong, after issuing
5640 applicable error messages. */
5643 grokfndecl (tree ctype,
5647 tree orig_declarator,
5649 enum overload_flags flags,
5656 special_function_kind sfk,
5663 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
5664 int has_default_arg = 0;
5668 type = build_exception_variant (type, raises);
5670 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
5671 DECL_ARGUMENTS (decl) = parms;
5672 /* Propagate volatile out from type to decl. */
5673 if (TYPE_VOLATILE (type))
5674 TREE_THIS_VOLATILE (decl) = 1;
5676 /* If this decl has namespace scope, set that up. */
5678 set_decl_namespace (decl, in_namespace, friendp);
5680 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
5682 /* `main' and builtins have implicit 'C' linkage. */
5683 if ((MAIN_NAME_P (declarator)
5684 || (IDENTIFIER_LENGTH (declarator) > 10
5685 && IDENTIFIER_POINTER (declarator)[0] == '_'
5686 && IDENTIFIER_POINTER (declarator)[1] == '_'
5687 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
5688 && current_lang_name == lang_name_cplusplus
5689 && ctype == NULL_TREE
5690 /* NULL_TREE means global namespace. */
5691 && DECL_CONTEXT (decl) == NULL_TREE)
5692 SET_DECL_LANGUAGE (decl, lang_c);
5694 /* Should probably propagate const out from type to decl I bet (mrs). */
5697 DECL_STATIC_FUNCTION_P (decl) = 1;
5698 DECL_CONTEXT (decl) = ctype;
5703 DECL_CONTEXT (decl) = ctype;
5705 check_class_member_definition_namespace (decl);
5708 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
5710 if (processing_template_decl)
5711 error ("cannot declare %<::main%> to be a template");
5713 error ("cannot declare %<::main%> to be inline");
5715 error ("cannot declare %<::main%> to be static");
5716 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
5719 error ("%<::main%> must return %<int%>");
5720 TREE_TYPE (TREE_TYPE (decl)) = integer_type_node;
5726 /* Members of anonymous types and local classes have no linkage; make
5727 them internal. If a typedef is made later, this will be changed. */
5728 if (ctype && (TYPE_ANONYMOUS_P (ctype)
5729 || decl_function_context (TYPE_MAIN_DECL (ctype))))
5734 /* [basic.link]: A name with no linkage (notably, the name of a class
5735 or enumeration declared in a local scope) shall not be used to
5736 declare an entity with linkage.
5738 Only check this for public decls for now. See core 319, 389. */
5739 t = no_linkage_check (TREE_TYPE (decl),
5740 /*relaxed_p=*/false);
5743 if (TYPE_ANONYMOUS_P (t))
5745 if (DECL_EXTERN_C_P (decl))
5746 /* Allow this; it's pretty common in C. */;
5749 pedwarn ("non-local function %q#D uses anonymous type",
5751 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
5752 pedwarn ("%q+#D does not refer to the unqualified "
5753 "type, so it is not used for linkage",
5758 pedwarn ("non-local function %q#D uses local type %qT", decl, t);
5762 TREE_PUBLIC (decl) = publicp;
5765 DECL_INTERFACE_KNOWN (decl) = 1;
5766 DECL_NOT_REALLY_EXTERN (decl) = 1;
5769 /* If the declaration was declared inline, mark it as such. */
5771 DECL_DECLARED_INLINE_P (decl) = 1;
5772 /* We inline functions that are explicitly declared inline, or, when
5773 the user explicitly asks us to, all functions. */
5774 if (DECL_DECLARED_INLINE_P (decl)
5775 || (flag_inline_trees == 2 && !DECL_INLINE (decl) && funcdef_flag))
5776 DECL_INLINE (decl) = 1;
5778 DECL_EXTERNAL (decl) = 1;
5779 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
5781 error ("%smember function %qD cannot have cv-qualifier",
5782 (ctype ? "static " : "non-"), decl);
5783 quals = TYPE_UNQUALIFIED;
5786 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl)))
5787 grok_op_properties (decl, /*complain=*/true);
5789 if (ctype && decl_function_context (decl))
5790 DECL_NO_STATIC_CHAIN (decl) = 1;
5792 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
5793 if (TREE_PURPOSE (t)
5794 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
5796 has_default_arg = 1;
5801 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
5805 ("defining explicit specialization %qD in friend declaration",
5809 tree fns = TREE_OPERAND (orig_declarator, 0);
5810 tree args = TREE_OPERAND (orig_declarator, 1);
5812 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
5814 /* Something like `template <class T> friend void f<T>()'. */
5815 error ("invalid use of template-id %qD in declaration "
5816 "of primary template",
5822 /* A friend declaration of the form friend void f<>(). Record
5823 the information in the TEMPLATE_ID_EXPR. */
5824 SET_DECL_IMPLICIT_INSTANTIATION (decl);
5826 if (TREE_CODE (fns) == COMPONENT_REF)
5828 /* Due to bison parser ickiness, we will have already looked
5829 up an operator_name or PFUNCNAME within the current class
5830 (see template_id in parse.y). If the current class contains
5831 such a name, we'll get a COMPONENT_REF here. Undo that. */
5833 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
5834 == current_class_type);
5835 fns = TREE_OPERAND (fns, 1);
5837 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
5838 || TREE_CODE (fns) == OVERLOAD);
5839 DECL_TEMPLATE_INFO (decl) = tree_cons (fns, args, NULL_TREE);
5841 if (has_default_arg)
5843 error ("default arguments are not allowed in declaration "
5844 "of friend template specialization %qD",
5851 error ("%<inline%> is not allowed in declaration of friend "
5852 "template specialization %qD",
5860 /* Make the init_value nonzero so pushdecl knows this is not
5861 tentative. error_mark_node is replaced later with the BLOCK. */
5862 DECL_INITIAL (decl) = error_mark_node;
5864 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
5865 TREE_NOTHROW (decl) = 1;
5867 /* Caller will do the rest of this. */
5871 if (ctype != NULL_TREE)
5873 if (sfk == sfk_constructor)
5874 DECL_CONSTRUCTOR_P (decl) = 1;
5876 grokclassfn (ctype, decl, flags, quals);
5879 decl = check_explicit_specialization (orig_declarator, decl,
5881 2 * (funcdef_flag != 0) +
5882 4 * (friendp != 0));
5883 if (decl == error_mark_node)
5888 cplus_decl_attributes (&decl, *attrlist, 0);
5889 *attrlist = NULL_TREE;
5892 if (ctype != NULL_TREE
5893 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
5898 old_decl = check_classfn (ctype, decl,
5899 (processing_template_decl
5900 > template_class_depth (ctype))
5901 ? current_template_parms
5904 if (old_decl && TREE_CODE (old_decl) == TEMPLATE_DECL)
5905 /* Because grokfndecl is always supposed to return a
5906 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
5907 here. We depend on our callers to figure out that its
5908 really a template that's being returned. */
5909 old_decl = DECL_TEMPLATE_RESULT (old_decl);
5911 if (old_decl && DECL_STATIC_FUNCTION_P (old_decl)
5912 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
5913 /* Remove the `this' parm added by grokclassfn.
5914 XXX Isn't this done in start_function, too? */
5915 revert_static_member_fn (decl);
5916 if (old_decl && DECL_ARTIFICIAL (old_decl))
5917 error ("definition of implicitly-declared %qD", old_decl);
5924 /* Since we've smashed OLD_DECL to its
5925 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
5926 if (TREE_CODE (decl) == TEMPLATE_DECL)
5927 decl = DECL_TEMPLATE_RESULT (decl);
5929 /* Attempt to merge the declarations. This can fail, in
5930 the case of some invalid specialization declarations. */
5931 pushed_scope = push_scope (ctype);
5932 ok = duplicate_decls (decl, old_decl, friendp);
5934 pop_scope (pushed_scope);
5937 error ("no %q#D member function declared in class %qT",
5945 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
5948 if (ctype == NULL_TREE || check)
5952 DECL_VIRTUAL_P (decl) = 1;
5957 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
5958 the linkage that DECL will receive in the object file. */
5961 set_linkage_for_static_data_member (tree decl)
5963 /* A static data member always has static storage duration and
5964 external linkage. Note that static data members are forbidden in
5965 local classes -- the only situation in which a class has
5966 non-external linkage. */
5967 TREE_PUBLIC (decl) = 1;
5968 TREE_STATIC (decl) = 1;
5969 /* For non-template classes, static data members are always put
5970 out in exactly those files where they are defined, just as
5971 with ordinary namespace-scope variables. */
5972 if (!processing_template_decl)
5973 DECL_INTERFACE_KNOWN (decl) = 1;
5976 /* Create a VAR_DECL named NAME with the indicated TYPE.
5978 If SCOPE is non-NULL, it is the class type or namespace containing
5979 the variable. If SCOPE is NULL, the variable should is created in
5980 the innermost enclosings scope. */
5983 grokvardecl (tree type,
5985 const cp_decl_specifier_seq *declspecs,
5991 tree explicit_scope;
5993 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
5995 /* Compute the scope in which to place the variable, but remember
5996 whether or not that scope was explicitly specified by the user. */
5997 explicit_scope = scope;
6000 /* An explicit "extern" specifier indicates a namespace-scope
6002 if (declspecs->storage_class == sc_extern)
6003 scope = current_namespace;
6004 else if (!at_function_scope_p ())
6005 scope = current_scope ();
6009 && (/* If the variable is a namespace-scope variable declared in a
6010 template, we need DECL_LANG_SPECIFIC. */
6011 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
6012 /* Similarly for namespace-scope variables with language linkage
6014 || (TREE_CODE (scope) == NAMESPACE_DECL
6015 && current_lang_name != lang_name_cplusplus)
6016 /* Similarly for static data members. */
6018 decl = build_lang_decl (VAR_DECL, name, type);
6020 decl = build_decl (VAR_DECL, name, type);
6022 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
6023 set_decl_namespace (decl, explicit_scope, 0);
6025 DECL_CONTEXT (decl) = scope;
6027 if (declspecs->storage_class == sc_extern)
6029 DECL_THIS_EXTERN (decl) = 1;
6030 DECL_EXTERNAL (decl) = !initialized;
6033 if (DECL_CLASS_SCOPE_P (decl))
6035 set_linkage_for_static_data_member (decl);
6036 /* This function is only called with out-of-class definitions. */
6037 DECL_EXTERNAL (decl) = 0;
6038 check_class_member_definition_namespace (decl);
6040 /* At top level, either `static' or no s.c. makes a definition
6041 (perhaps tentative), and absence of `static' makes it public. */
6042 else if (toplevel_bindings_p ())
6044 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
6045 && (DECL_THIS_EXTERN (decl) || ! constp));
6046 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
6048 /* Not at top level, only `static' makes a static definition. */
6051 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
6052 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
6055 if (declspecs->specs[(int)ds_thread])
6057 if (targetm.have_tls)
6058 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
6060 /* A mere warning is sure to result in improper semantics
6061 at runtime. Don't bother to allow this to compile. */
6062 error ("thread-local storage not supported for this target");
6065 if (TREE_PUBLIC (decl))
6067 /* [basic.link]: A name with no linkage (notably, the name of a class
6068 or enumeration declared in a local scope) shall not be used to
6069 declare an entity with linkage.
6071 Only check this for public decls for now. */
6072 tree t = no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false);
6075 if (TYPE_ANONYMOUS_P (t))
6077 if (DECL_EXTERN_C_P (decl))
6078 /* Allow this; it's pretty common in C. */
6082 /* DRs 132, 319 and 389 seem to indicate types with
6083 no linkage can only be used to declare extern "C"
6084 entities. Since it's not always an error in the
6085 ISO C++ 90 Standard, we only issue a warning. */
6086 warning (0, "non-local variable %q#D uses anonymous type",
6088 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
6089 warning (0, "%q+#D does not refer to the unqualified "
6090 "type, so it is not used for linkage",
6095 warning (0, "non-local variable %q#D uses local type %qT", decl, t);
6099 DECL_INTERFACE_KNOWN (decl) = 1;
6104 /* Create and return a canonical pointer to member function type, for
6105 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
6108 build_ptrmemfunc_type (tree type)
6112 tree unqualified_variant = NULL_TREE;
6114 if (type == error_mark_node)
6117 /* If a canonical type already exists for this type, use it. We use
6118 this method instead of type_hash_canon, because it only does a
6119 simple equality check on the list of field members. */
6121 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
6124 /* Make sure that we always have the unqualified pointer-to-member
6126 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
6128 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
6130 t = make_aggr_type (RECORD_TYPE);
6131 xref_basetypes (t, NULL_TREE);
6133 /* Let the front-end know this is a pointer to member function... */
6134 TYPE_PTRMEMFUNC_FLAG (t) = 1;
6135 /* ... and not really an aggregate. */
6136 SET_IS_AGGR_TYPE (t, 0);
6138 field = build_decl (FIELD_DECL, pfn_identifier, type);
6141 field = build_decl (FIELD_DECL, delta_identifier, delta_type_node);
6142 TREE_CHAIN (field) = fields;
6145 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
6147 /* Zap out the name so that the back-end will give us the debugging
6148 information for this anonymous RECORD_TYPE. */
6149 TYPE_NAME (t) = NULL_TREE;
6151 /* If this is not the unqualified form of this pointer-to-member
6152 type, set the TYPE_MAIN_VARIANT for this type to be the
6153 unqualified type. Since they are actually RECORD_TYPEs that are
6154 not variants of each other, we must do this manually. */
6155 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
6157 t = build_qualified_type (t, cp_type_quals (type));
6158 TYPE_MAIN_VARIANT (t) = unqualified_variant;
6159 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
6160 TYPE_NEXT_VARIANT (unqualified_variant) = t;
6163 /* Cache this pointer-to-member type so that we can find it again
6165 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
6170 /* Create and return a pointer to data member type. */
6173 build_ptrmem_type (tree class_type, tree member_type)
6175 if (TREE_CODE (member_type) == METHOD_TYPE)
6179 arg_types = TYPE_ARG_TYPES (member_type);
6180 class_type = (cp_build_qualified_type
6182 cp_type_quals (TREE_TYPE (TREE_VALUE (arg_types)))));
6184 = build_method_type_directly (class_type,
6185 TREE_TYPE (member_type),
6186 TREE_CHAIN (arg_types));
6187 return build_ptrmemfunc_type (build_pointer_type (member_type));
6191 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
6192 return build_offset_type (class_type, member_type);
6196 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
6197 Check to see that the definition is valid. Issue appropriate error
6198 messages. Return 1 if the definition is particularly bad, or 0
6202 check_static_variable_definition (tree decl, tree type)
6204 /* Motion 10 at San Diego: If a static const integral data member is
6205 initialized with an integral constant expression, the initializer
6206 may appear either in the declaration (within the class), or in
6207 the definition, but not both. If it appears in the class, the
6208 member is a member constant. The file-scope definition is always
6210 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
6212 error ("invalid in-class initialization of static data member "
6213 "of non-integral type %qT",
6215 /* If we just return the declaration, crashes will sometimes
6216 occur. We therefore return void_type_node, as if this were a
6217 friend declaration, to cause callers to completely ignore
6218 this declaration. */
6221 else if (!CP_TYPE_CONST_P (type))
6222 error ("ISO C++ forbids in-class initialization of non-const "
6223 "static member %qD",
6225 else if (pedantic && !INTEGRAL_TYPE_P (type))
6226 pedwarn ("ISO C++ forbids initialization of member constant "
6227 "%qD of non-integral type %qT", decl, type);
6232 /* Given the SIZE (i.e., number of elements) in an array, compute an
6233 appropriate index type for the array. If non-NULL, NAME is the
6234 name of the thing being declared. */
6237 compute_array_index_type (tree name, tree size)
6239 tree type = TREE_TYPE (size);
6242 /* The array bound must be an integer type. */
6243 if (!dependent_type_p (type) && !INTEGRAL_TYPE_P (type))
6246 error ("size of array %qD has non-integral type %qT", name, type);
6248 error ("size of array has non-integral type %qT", type);
6249 size = integer_one_node;
6250 type = TREE_TYPE (size);
6253 if (abi_version_at_least (2)
6254 /* We should only handle value dependent expressions specially. */
6255 ? value_dependent_expression_p (size)
6256 /* But for abi-1, we handled all instances in templates. This
6257 effects the manglings produced. */
6258 : processing_template_decl)
6259 return build_index_type (build_min (MINUS_EXPR, sizetype,
6260 size, integer_one_node));
6262 /* The size might be the result of a cast. */
6263 STRIP_TYPE_NOPS (size);
6265 /* It might be a const variable or enumeration constant. */
6266 size = integral_constant_value (size);
6268 /* Normally, the array-bound will be a constant. */
6269 if (TREE_CODE (size) == INTEGER_CST)
6271 /* Check to see if the array bound overflowed. Make that an
6272 error, no matter how generous we're being. */
6273 int old_flag_pedantic_errors = flag_pedantic_errors;
6274 int old_pedantic = pedantic;
6275 pedantic = flag_pedantic_errors = 1;
6276 constant_expression_warning (size);
6277 pedantic = old_pedantic;
6278 flag_pedantic_errors = old_flag_pedantic_errors;
6280 /* An array must have a positive number of elements. */
6281 if (INT_CST_LT (size, integer_zero_node))
6284 error ("size of array %qD is negative", name);
6286 error ("size of array is negative");
6287 size = integer_one_node;
6289 /* As an extension we allow zero-sized arrays. We always allow
6290 them in system headers because glibc uses them. */
6291 else if (integer_zerop (size) && pedantic && !in_system_header)
6294 pedwarn ("ISO C++ forbids zero-size array %qD", name);
6296 pedwarn ("ISO C++ forbids zero-size array");
6299 else if (TREE_CONSTANT (size))
6301 /* `(int) &fn' is not a valid array bound. */
6303 error ("size of array %qD is not an integral constant-expression",
6306 error ("size of array is not an integral constant-expression");
6311 pedwarn ("ISO C++ forbids variable-size array %qD", name);
6313 pedwarn ("ISO C++ forbids variable-size array");
6316 if (processing_template_decl && !TREE_CONSTANT (size))
6317 /* A variable sized array. */
6318 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
6321 HOST_WIDE_INT saved_processing_template_decl;
6323 /* Compute the index of the largest element in the array. It is
6324 one less than the number of elements in the array. We save
6325 and restore PROCESSING_TEMPLATE_DECL so that computations in
6326 cp_build_binary_op will be appropriately folded. */
6327 saved_processing_template_decl = processing_template_decl;
6328 processing_template_decl = 0;
6329 itype = cp_build_binary_op (MINUS_EXPR,
6330 cp_convert (ssizetype, size),
6331 cp_convert (ssizetype, integer_one_node));
6332 itype = fold (itype);
6333 processing_template_decl = saved_processing_template_decl;
6335 if (!TREE_CONSTANT (itype))
6336 /* A variable sized array. */
6337 itype = variable_size (itype);
6338 /* Make sure that there was no overflow when creating to a signed
6339 index type. (For example, on a 32-bit machine, an array with
6340 size 2^32 - 1 is too big.) */
6341 else if (TREE_OVERFLOW (itype))
6343 error ("overflow in array dimension");
6344 TREE_OVERFLOW (itype) = 0;
6348 /* Create and return the appropriate index type. */
6349 return build_index_type (itype);
6352 /* Returns the scope (if any) in which the entity declared by
6353 DECLARATOR will be located. If the entity was declared with an
6354 unqualified name, NULL_TREE is returned. */
6357 get_scope_of_declarator (const cp_declarator *declarator)
6359 while (declarator && declarator->kind != cdk_id)
6360 declarator = declarator->declarator;
6362 /* If the declarator-id is a SCOPE_REF, the scope in which the
6363 declaration occurs is the first operand. */
6365 && declarator->u.id.qualifying_scope)
6366 return declarator->u.id.qualifying_scope;
6368 /* Otherwise, the declarator is not a qualified name; the entity will
6369 be declared in the current scope. */
6373 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
6374 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
6378 create_array_type_for_decl (tree name, tree type, tree size)
6380 tree itype = NULL_TREE;
6381 const char* error_msg;
6383 /* If things have already gone awry, bail now. */
6384 if (type == error_mark_node || size == error_mark_node)
6385 return error_mark_node;
6387 /* Assume that everything will go OK. */
6390 /* There are some types which cannot be array elements. */
6391 switch (TREE_CODE (type))
6394 error_msg = "array of void";
6398 error_msg = "array of functions";
6401 case REFERENCE_TYPE:
6402 error_msg = "array of references";
6406 error_msg = "array of function members";
6413 /* If something went wrong, issue an error-message and return. */
6417 error ("declaration of %qD as %s", name, error_msg);
6419 error ("creating %s", error_msg);
6421 return error_mark_node;
6426 The constant expressions that specify the bounds of the arrays
6427 can be omitted only for the first member of the sequence. */
6428 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
6431 error ("declaration of %qD as multidimensional array must "
6432 "have bounds for all dimensions except the first",
6435 error ("multidimensional array must have bounds for all "
6436 "dimensions except the first");
6438 return error_mark_node;
6441 /* Figure out the index type for the array. */
6443 itype = compute_array_index_type (name, size);
6446 T is called the array element type; this type shall not be [...] an
6447 abstract class type. */
6448 abstract_virtuals_error (name, type);
6450 return build_cplus_array_type (type, itype);
6453 /* Check that it's OK to declare a function with the indicated TYPE.
6454 SFK indicates the kind of special function (if any) that this
6455 function is. OPTYPE is the type given in a conversion operator
6456 declaration, or the class type for a constructor/destructor.
6457 Returns the actual return type of the function; that
6458 may be different than TYPE if an error occurs, or for certain
6459 special functions. */
6462 check_special_function_return_type (special_function_kind sfk,
6468 case sfk_constructor:
6470 error ("return type specification for constructor invalid");
6472 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
6473 type = build_pointer_type (optype);
6475 type = void_type_node;
6478 case sfk_destructor:
6480 error ("return type specification for destructor invalid");
6481 /* We can't use the proper return type here because we run into
6482 problems with ambiguous bases and covariant returns.
6483 Java classes are left unchanged because (void *) isn't a valid
6484 Java type, and we don't want to change the Java ABI. */
6485 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
6486 type = build_pointer_type (void_type_node);
6488 type = void_type_node;
6491 case sfk_conversion:
6492 if (type && !same_type_p (type, optype))
6493 error ("operator %qT declared to return %qT", optype, type);
6495 pedwarn ("return type specified for %<operator %T%>", optype);
6506 /* A variable or data member (whose unqualified name is IDENTIFIER)
6507 has been declared with the indicated TYPE. If the TYPE is not
6508 acceptable, issue an error message and return a type to use for
6509 error-recovery purposes. */
6512 check_var_type (tree identifier, tree type)
6514 if (VOID_TYPE_P (type))
6517 error ("unnamed variable or field declared void");
6518 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
6520 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
6521 error ("variable or field %qE declared void", identifier);
6524 error ("variable or field declared void");
6525 type = integer_type_node;
6531 /* Given declspecs and a declarator (abstract or otherwise), determine
6532 the name and type of the object declared and construct a DECL node
6535 DECLSPECS is a chain of tree_list nodes whose value fields
6536 are the storage classes and type specifiers.
6538 DECL_CONTEXT says which syntactic context this declaration is in:
6539 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
6540 FUNCDEF for a function definition. Like NORMAL but a few different
6541 error messages in each case. Return value may be zero meaning
6542 this definition is too screwy to try to parse.
6543 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
6544 handle member functions (which have FIELD context).
6545 Return value may be zero meaning this definition is too screwy to
6547 PARM for a parameter declaration (either within a function prototype
6548 or before a function body). Make a PARM_DECL, or return void_type_node.
6549 CATCHPARM for a parameter declaration before a catch clause.
6550 TYPENAME if for a typename (in a cast or sizeof).
6551 Don't make a DECL node; just return the ..._TYPE node.
6552 FIELD for a struct or union field; make a FIELD_DECL.
6553 BITFIELD for a field with specified width.
6554 INITIALIZED is 1 if the decl has an initializer.
6556 ATTRLIST is a pointer to the list of attributes, which may be NULL
6557 if there are none; *ATTRLIST may be modified if attributes from inside
6558 the declarator should be applied to the declaration.
6560 When this function is called, scoping variables (such as
6561 CURRENT_CLASS_TYPE) should reflect the scope in which the
6562 declaration occurs, not the scope in which the new declaration will
6563 be placed. For example, on:
6567 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
6568 should not be `S'. */
6571 grokdeclarator (const cp_declarator *declarator,
6572 const cp_decl_specifier_seq *declspecs,
6573 enum decl_context decl_context,
6577 tree type = NULL_TREE;
6580 int virtualp, explicitp, friendp, inlinep, staticp;
6581 int explicit_int = 0;
6582 int explicit_char = 0;
6583 int defaulted_int = 0;
6584 tree dependant_name = NULL_TREE;
6586 tree typedef_decl = NULL_TREE;
6587 const char *name = NULL;
6588 tree typedef_type = NULL_TREE;
6589 int funcdef_flag = 0;
6590 cp_declarator_kind innermost_code = cdk_error;
6593 /* See the code below that used this. */
6594 tree decl_attr = NULL_TREE;
6597 /* Keep track of what sort of function is being processed
6598 so that we can warn about default return values, or explicit
6599 return values which do not match prescribed defaults. */
6600 special_function_kind sfk = sfk_none;
6602 tree dname = NULL_TREE;
6603 tree ctor_return_type = NULL_TREE;
6604 enum overload_flags flags = NO_SPECIAL;
6605 cp_cv_quals quals = TYPE_UNQUALIFIED;
6606 tree raises = NULL_TREE;
6607 int template_count = 0;
6608 tree returned_attrs = NULL_TREE;
6609 tree parms = NULL_TREE;
6610 const cp_declarator *id_declarator;
6611 /* The unqualified name of the declarator; either an
6612 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
6613 tree unqualified_id;
6614 /* The class type, if any, in which this entity is located,
6615 or NULL_TREE if none. Note that this value may be different from
6616 the current class type; for example if an attempt is made to declare
6617 "A::f" inside "B", this value will be "A". */
6618 tree ctype = current_class_type;
6619 /* The NAMESPACE_DECL for the namespace in which this entity is
6620 located. If an unqualified name is used to declare the entity,
6621 this value will be NULL_TREE, even if the entity is located at
6623 tree in_namespace = NULL_TREE;
6625 cp_storage_class storage_class;
6626 bool unsigned_p, signed_p, short_p, long_p, thread_p;
6627 bool type_was_error_mark_node = false;
6629 signed_p = declspecs->specs[(int)ds_signed];
6630 unsigned_p = declspecs->specs[(int)ds_unsigned];
6631 short_p = declspecs->specs[(int)ds_short];
6632 long_p = declspecs->specs[(int)ds_long];
6633 thread_p = declspecs->specs[(int)ds_thread];
6635 if (decl_context == FUNCDEF)
6636 funcdef_flag = 1, decl_context = NORMAL;
6637 else if (decl_context == MEMFUNCDEF)
6638 funcdef_flag = -1, decl_context = FIELD;
6639 else if (decl_context == BITFIELD)
6640 bitfield = 1, decl_context = FIELD;
6642 /* Look inside a declarator for the name being declared
6643 and get it as a string, for an error message. */
6644 for (id_declarator = declarator;
6646 id_declarator = id_declarator->declarator)
6648 if (id_declarator->kind != cdk_id)
6649 innermost_code = id_declarator->kind;
6651 switch (id_declarator->kind)
6654 if (id_declarator->declarator
6655 && id_declarator->declarator->kind == cdk_id)
6657 sfk = id_declarator->declarator->u.id.sfk;
6658 if (sfk == sfk_destructor)
6665 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
6666 tree decl = id_declarator->u.id.unqualified_name;
6669 if (qualifying_scope)
6671 if (TYPE_P (qualifying_scope))
6673 ctype = qualifying_scope;
6674 if (innermost_code != cdk_function
6675 && current_class_type
6676 && !UNIQUELY_DERIVED_FROM_P (ctype,
6677 current_class_type))
6679 error ("type %qT is not derived from type %qT",
6680 ctype, current_class_type);
6681 return error_mark_node;
6684 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
6685 in_namespace = qualifying_scope;
6687 if (TREE_CODE (decl) == BASELINK)
6688 decl = BASELINK_FUNCTIONS (decl);
6689 if (decl == error_mark_node)
6690 return error_mark_node;
6691 switch (TREE_CODE (decl))
6697 if (innermost_code != cdk_function)
6699 error ("declaration of %qD as non-function", decl);
6700 return error_mark_node;
6702 else if (!qualifying_scope
6703 && !(current_class_type && at_class_scope_p ()))
6705 error ("declaration of %qD as non-member", decl);
6706 return error_mark_node;
6709 type = TREE_OPERAND (decl, 0);
6710 name = IDENTIFIER_POINTER (constructor_name (type));
6714 case TEMPLATE_ID_EXPR:
6716 tree fns = TREE_OPERAND (decl, 0);
6719 if (TREE_CODE (dname) == COMPONENT_REF)
6720 dname = TREE_OPERAND (dname, 1);
6721 if (TREE_CODE (dname) != IDENTIFIER_NODE)
6723 gcc_assert (is_overloaded_fn (dname));
6724 dname = DECL_NAME (get_first_fn (dname));
6729 case IDENTIFIER_NODE:
6730 if (TREE_CODE (decl) == IDENTIFIER_NODE)
6733 if (C_IS_RESERVED_WORD (dname))
6735 error ("declarator-id missing; using reserved word %qD",
6737 name = IDENTIFIER_POINTER (dname);
6739 else if (!IDENTIFIER_TYPENAME_P (dname))
6740 name = IDENTIFIER_POINTER (dname);
6743 gcc_assert (flags == NO_SPECIAL);
6744 flags = TYPENAME_FLAG;
6745 ctor_return_type = TREE_TYPE (dname);
6746 sfk = sfk_conversion;
6747 if (is_typename_at_global_scope (dname))
6748 name = IDENTIFIER_POINTER (dname);
6750 name = "<invalid operator>";
6755 dname = constructor_name (TREE_TYPE (decl));
6756 name = IDENTIFIER_POINTER (dname);
6777 if (id_declarator->kind == cdk_id)
6781 /* A function definition's declarator must have the form of
6782 a function declarator. */
6784 if (funcdef_flag && innermost_code != cdk_function)
6787 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
6788 && innermost_code != cdk_function
6789 && ! (ctype && !declspecs->any_specifiers_p))
6791 error ("declaration of %qD as non-function", dname);
6792 return error_mark_node;
6795 /* Anything declared one level down from the top level
6796 must be one of the parameters of a function
6797 (because the body is at least two levels down). */
6799 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
6800 by not allowing C++ class definitions to specify their parameters
6801 with xdecls (must be spec.d in the parmlist).
6803 Since we now wait to push a class scope until we are sure that
6804 we are in a legitimate method context, we must set oldcname
6805 explicitly (since current_class_name is not yet alive).
6807 We also want to avoid calling this a PARM if it is in a namespace. */
6809 if (decl_context == NORMAL && !toplevel_bindings_p ())
6811 struct cp_binding_level *b = current_binding_level;
6812 current_binding_level = b->level_chain;
6813 if (current_binding_level != 0 && toplevel_bindings_p ())
6814 decl_context = PARM;
6815 current_binding_level = b;
6819 name = decl_context == PARM ? "parameter" : "type name";
6821 /* If there were multiple types specified in the decl-specifier-seq,
6822 issue an error message. */
6823 if (declspecs->multiple_types_p)
6824 error ("two or more data types in declaration of %qs", name);
6825 /* Extract the basic type from the decl-specifier-seq. */
6826 type = declspecs->type;
6827 if (type == error_mark_node)
6830 type_was_error_mark_node = true;
6832 /* If the entire declaration is itself tagged as deprecated then
6833 suppress reports of deprecated items. */
6834 if (type && TREE_DEPRECATED (type)
6835 && deprecated_state != DEPRECATED_SUPPRESS)
6836 warn_deprecated_use (type);
6837 if (type && TREE_CODE (type) == TYPE_DECL)
6839 typedef_decl = type;
6840 type = TREE_TYPE (typedef_decl);
6842 /* No type at all: default to `int', and set DEFAULTED_INT
6843 because it was not a user-defined typedef. */
6844 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
6846 /* These imply 'int'. */
6847 type = integer_type_node;
6851 explicit_int = declspecs->explicit_int_p;
6852 explicit_char = declspecs->explicit_char_p;
6854 /* Check for repeated decl-specifiers. */
6855 for (ds = ds_first; ds != ds_last; ++ds)
6857 unsigned count = declspecs->specs[(int)ds];
6860 /* The "long" specifier is a special case because of
6865 error ("%<long long long%> is too long for GCC");
6866 else if (pedantic && !in_system_header && warn_long_long)
6867 pedwarn ("ISO C++ does not support %<long long%>");
6871 else if (declspecs->specs[(int)ds] > 1)
6873 static const char *const decl_spec_names[] = {
6889 error ("duplicate %qs", decl_spec_names[(int)ds]);
6894 /* See the code below that used this. */
6896 decl_attr = DECL_ATTRIBUTES (typedef_decl);
6898 typedef_type = type;
6901 if (sfk != sfk_conversion)
6902 ctor_return_type = ctype;
6904 if (sfk != sfk_none)
6905 type = check_special_function_return_type (sfk, type,
6907 else if (type == NULL_TREE)
6913 /* We handle `main' specially here, because 'main () { }' is so
6914 common. With no options, it is allowed. With -Wreturn-type,
6915 it is a warning. It is only an error with -pedantic-errors. */
6916 is_main = (funcdef_flag
6917 && dname && MAIN_NAME_P (dname)
6918 && ctype == NULL_TREE
6919 && in_namespace == NULL_TREE
6920 && current_namespace == global_namespace);
6922 if (type_was_error_mark_node)
6923 /* We've already issued an error, don't complain more. */;
6924 else if (in_system_header || flag_ms_extensions)
6925 /* Allow it, sigh. */;
6926 else if (pedantic || ! is_main)
6927 pedwarn ("ISO C++ forbids declaration of %qs with no type", name);
6928 else if (warn_return_type)
6929 warning (0, "ISO C++ forbids declaration of %qs with no type", name);
6931 type = integer_type_node;
6936 /* Now process the modifiers that were specified
6937 and check for invalid combinations. */
6939 /* Long double is a special combination. */
6940 if (long_p && TYPE_MAIN_VARIANT (type) == double_type_node)
6943 type = build_qualified_type (long_double_type_node,
6944 cp_type_quals (type));
6947 /* Check all other uses of type modifiers. */
6949 if (unsigned_p || signed_p || long_p || short_p)
6953 if (TREE_CODE (type) == REAL_TYPE)
6954 error ("short, signed or unsigned invalid for %qs", name);
6955 else if (TREE_CODE (type) != INTEGER_TYPE)
6956 error ("long, short, signed or unsigned invalid for %qs", name);
6957 else if (long_p && short_p)
6958 error ("long and short specified together for %qs", name);
6959 else if ((long_p || short_p) && explicit_char)
6960 error ("long or short specified with char for %qs", name);
6961 else if ((long_p|| short_p) && TREE_CODE (type) == REAL_TYPE)
6962 error ("long or short specified with floating type for %qs", name);
6963 else if (signed_p && unsigned_p)
6964 error ("signed and unsigned given together for %qs", name);
6968 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
6970 pedwarn ("long, short, signed or unsigned used invalidly for %qs",
6972 if (flag_pedantic_errors)
6977 /* Discard the type modifiers if they are invalid. */
6988 /* Decide whether an integer type is signed or not.
6989 Optionally treat bitfields as signed by default. */
6993 It is implementation-defined whether a plain (neither
6994 explicitly signed or unsigned) char, short, int, or long
6995 bit-field is signed or unsigned.
6997 Naturally, we extend this to long long as well. Note that
6998 this does not include wchar_t. */
6999 || (bitfield && !flag_signed_bitfields
7001 /* A typedef for plain `int' without `signed' can be
7002 controlled just like plain `int', but a typedef for
7003 `signed int' cannot be so controlled. */
7005 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
7006 && (TREE_CODE (type) == INTEGER_TYPE
7007 || TREE_CODE (type) == CHAR_TYPE)
7008 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
7011 type = long_long_unsigned_type_node;
7013 type = long_unsigned_type_node;
7015 type = short_unsigned_type_node;
7016 else if (type == char_type_node)
7017 type = unsigned_char_type_node;
7018 else if (typedef_decl)
7019 type = c_common_unsigned_type (type);
7021 type = unsigned_type_node;
7023 else if (signed_p && type == char_type_node)
7024 type = signed_char_type_node;
7026 type = long_long_integer_type_node;
7028 type = long_integer_type_node;
7030 type = short_integer_type_node;
7032 if (declspecs->specs[(int)ds_complex])
7034 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
7035 error ("complex invalid for %qs", name);
7036 /* If we just have "complex", it is equivalent to
7037 "complex double", but if any modifiers at all are specified it is
7038 the complex form of TYPE. E.g, "complex short" is
7039 "complex short int". */
7041 else if (defaulted_int && ! longlong
7042 && ! (long_p || short_p || signed_p || unsigned_p))
7043 type = complex_double_type_node;
7044 else if (type == integer_type_node)
7045 type = complex_integer_type_node;
7046 else if (type == float_type_node)
7047 type = complex_float_type_node;
7048 else if (type == double_type_node)
7049 type = complex_double_type_node;
7050 else if (type == long_double_type_node)
7051 type = complex_long_double_type_node;
7053 type = build_complex_type (type);
7056 type_quals = TYPE_UNQUALIFIED;
7057 if (declspecs->specs[(int)ds_const])
7058 type_quals |= TYPE_QUAL_CONST;
7059 if (declspecs->specs[(int)ds_volatile])
7060 type_quals |= TYPE_QUAL_VOLATILE;
7061 if (declspecs->specs[(int)ds_restrict])
7062 type_quals |= TYPE_QUAL_RESTRICT;
7063 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
7064 error ("qualifiers are not allowed on declaration of %<operator %T%>",
7067 if (TREE_CODE (type) == FUNCTION_TYPE
7068 && type_quals != TYPE_UNQUALIFIED)
7070 /* This was an error in C++98 (cv-qualifiers cannot be added to
7071 a function type), but DR 295 makes the code well-formed by
7072 dropping the extra qualifiers. */
7075 tree bad_type = build_qualified_type (type, type_quals);
7076 pedwarn ("ignoring %qV qualifiers added to function type %qT",
7079 type_quals = TYPE_UNQUALIFIED;
7081 type_quals |= cp_type_quals (type);
7082 type = cp_build_qualified_type_real
7083 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
7084 ? tf_ignore_bad_quals : 0) | tf_error | tf_warning));
7085 /* We might have ignored or rejected some of the qualifiers. */
7086 type_quals = cp_type_quals (type);
7089 inlinep = !! declspecs->specs[(int)ds_inline];
7090 virtualp = !! declspecs->specs[(int)ds_virtual];
7091 explicitp = !! declspecs->specs[(int)ds_explicit];
7093 storage_class = declspecs->storage_class;
7094 if (storage_class == sc_static)
7095 staticp = 1 + (decl_context == FIELD);
7097 if (virtualp && staticp == 2)
7099 error ("member %qD cannot be declared both virtual and static", dname);
7102 friendp = !! declspecs->specs[(int)ds_friend];
7104 if (dependant_name && !friendp)
7106 error ("%<%T::%D%> is not a valid declarator", ctype, dependant_name);
7107 return void_type_node;
7110 /* Issue errors about use of storage classes for parameters. */
7111 if (decl_context == PARM)
7113 if (declspecs->specs[(int)ds_typedef])
7114 error ("typedef declaration invalid in parameter declaration");
7115 else if (storage_class == sc_static
7116 || storage_class == sc_extern
7118 error ("storage class specifiers invalid in parameter declarations");
7121 /* Give error if `virtual' is used outside of class declaration. */
7123 && (current_class_name == NULL_TREE || decl_context != FIELD))
7125 error ("virtual outside class declaration");
7129 /* Static anonymous unions are dealt with here. */
7130 if (staticp && decl_context == TYPENAME
7132 && ANON_AGGR_TYPE_P (declspecs->type))
7133 decl_context = FIELD;
7135 /* Warn about storage classes that are invalid for certain
7136 kinds of declarations (parameters, typenames, etc.). */
7137 if (declspecs->multiple_storage_classes_p)
7139 error ("multiple storage classes in declaration of %qs", name);
7140 storage_class = sc_none;
7144 && storage_class != sc_extern
7145 && storage_class != sc_static)
7146 || declspecs->specs[(int)ds_typedef]))
7148 error ("multiple storage classes in declaration of %qs", name);
7151 else if (decl_context != NORMAL
7152 && ((storage_class != sc_none
7153 && storage_class != sc_mutable)
7156 if ((decl_context == PARM || decl_context == CATCHPARM)
7157 && (storage_class == sc_register
7158 || storage_class == sc_auto))
7160 else if (declspecs->specs[(int)ds_typedef])
7162 else if (decl_context == FIELD
7163 /* C++ allows static class elements. */
7164 && storage_class == sc_static)
7165 /* C++ also allows inlines and signed and unsigned elements,
7166 but in those cases we don't come in here. */
7170 if (decl_context == FIELD)
7171 error ("storage class specified for %qs", name);
7174 if (decl_context == PARM || decl_context == CATCHPARM)
7175 error ("storage class specified for parameter %qs", name);
7177 error ("storage class specified for typename");
7179 if (storage_class == sc_register
7180 || storage_class == sc_auto
7181 || storage_class == sc_extern
7183 storage_class = sc_none;
7186 else if (storage_class == sc_extern && initialized
7189 if (toplevel_bindings_p ())
7191 /* It's common practice (and completely valid) to have a const
7192 be initialized and declared extern. */
7193 if (!(type_quals & TYPE_QUAL_CONST))
7194 warning (0, "%qs initialized and declared %<extern%>", name);
7197 error ("%qs has both %<extern%> and initializer", name);
7199 else if (storage_class == sc_extern && funcdef_flag
7200 && ! toplevel_bindings_p ())
7201 error ("nested function %qs declared %<extern%>", name);
7202 else if (toplevel_bindings_p ())
7204 if (storage_class == sc_auto)
7205 error ("top-level declaration of %qs specifies %<auto%>", name);
7208 && storage_class != sc_extern
7209 && storage_class != sc_static)
7211 error ("function-scope %qs implicitly auto and declared %<__thread%>",
7216 if (storage_class && friendp)
7217 error ("storage class specifiers invalid in friend function declarations");
7220 unqualified_id = NULL_TREE;
7223 unqualified_id = id_declarator->u.id.unqualified_name;
7224 if (TREE_CODE (unqualified_id) == BASELINK)
7225 unqualified_id = BASELINK_FUNCTIONS (unqualified_id);
7226 switch (TREE_CODE (unqualified_id))
7230 = constructor_name (TREE_OPERAND (unqualified_id, 0));
7235 = constructor_name (TREE_TYPE (unqualified_id));
7238 case IDENTIFIER_NODE:
7239 case TEMPLATE_ID_EXPR:
7247 /* Determine the type of the entity declared by recurring on the
7249 for (; declarator; declarator = declarator->declarator)
7251 const cp_declarator *inner_declarator;
7254 if (type == error_mark_node)
7255 return error_mark_node;
7257 attrs = declarator->attributes;
7263 if (declarator == NULL || declarator->kind == cdk_id)
7264 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
7265 if (declarator->kind == cdk_function)
7266 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
7267 if (declarator->kind == cdk_array)
7268 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
7269 returned_attrs = decl_attributes (&type,
7270 chainon (returned_attrs, attrs),
7274 if (declarator->kind == cdk_id)
7277 inner_declarator = declarator->declarator;
7279 switch (declarator->kind)
7282 type = create_array_type_for_decl (dname, type,
7283 declarator->u.array.bounds);
7291 /* Declaring a function type.
7292 Make sure we have a valid type for the function to return. */
7294 /* We now know that the TYPE_QUALS don't apply to the
7295 decl, but to its return type. */
7296 type_quals = TYPE_UNQUALIFIED;
7298 /* Warn about some types functions can't return. */
7300 if (TREE_CODE (type) == FUNCTION_TYPE)
7302 error ("%qs declared as function returning a function", name);
7303 type = integer_type_node;
7305 if (TREE_CODE (type) == ARRAY_TYPE)
7307 error ("%qs declared as function returning an array", name);
7308 type = integer_type_node;
7311 /* Pick up type qualifiers which should be applied to `this'. */
7312 quals = declarator->u.function.qualifiers;
7314 /* Pick up the exception specifications. */
7315 raises = declarator->u.function.exception_specification;
7317 /* Say it's a definition only for the CALL_EXPR
7318 closest to the identifier. */
7319 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
7321 if (ctype == NULL_TREE
7322 && decl_context == FIELD
7324 && (friendp == 0 || dname == current_class_name))
7325 ctype = current_class_type;
7327 if (ctype && sfk == sfk_conversion)
7328 TYPE_HAS_CONVERSION (ctype) = 1;
7329 if (ctype && (sfk == sfk_constructor
7330 || sfk == sfk_destructor))
7332 /* We are within a class's scope. If our declarator name
7333 is the same as the class name, and we are defining
7334 a function, then it is a constructor/destructor, and
7335 therefore returns a void type. */
7337 if (flags == DTOR_FLAG)
7339 /* ISO C++ 12.4/2. A destructor may not be
7340 declared const or volatile. A destructor may
7343 error ("destructor cannot be static member function");
7346 error ("destructors may not be cv-qualified");
7347 quals = TYPE_UNQUALIFIED;
7349 if (decl_context == FIELD)
7351 if (! member_function_or_else (ctype,
7354 return void_type_node;
7357 else /* It's a constructor. */
7361 /* ISO C++ 12.1. A constructor may not be
7362 declared const or volatile. A constructor may
7363 not be virtual. A constructor may not be
7366 error ("constructor cannot be static member function");
7369 pedwarn ("constructors cannot be declared virtual");
7374 error ("constructors may not be cv-qualified");
7375 quals = TYPE_UNQUALIFIED;
7377 if (decl_context == FIELD)
7379 if (! member_function_or_else (ctype,
7382 return void_type_node;
7383 TYPE_HAS_CONSTRUCTOR (ctype) = 1;
7384 if (sfk != sfk_constructor)
7388 if (decl_context == FIELD)
7394 error ("can't initialize friend function %qs", name);
7397 /* Cannot be both friend and virtual. */
7398 error ("virtual functions cannot be friends");
7401 if (decl_context == NORMAL)
7402 error ("friend declaration not in class definition");
7403 if (current_function_decl && funcdef_flag)
7404 error ("can't define friend function %qs in a local "
7409 arg_types = grokparms (declarator->u.function.parameters,
7412 if (inner_declarator
7413 && inner_declarator->kind == cdk_id
7414 && inner_declarator->u.id.sfk == sfk_destructor
7415 && arg_types != void_list_node)
7417 error ("destructors may not have parameters");
7418 arg_types = void_list_node;
7422 type = build_function_type (type, arg_types);
7423 type = cp_build_qualified_type (type, quals);
7430 /* Filter out pointers-to-references and references-to-references.
7431 We can get these if a TYPE_DECL is used. */
7433 if (TREE_CODE (type) == REFERENCE_TYPE)
7435 error (declarator->kind == cdk_reference
7436 ? "cannot declare reference to %q#T"
7437 : "cannot declare pointer to %q#T", type);
7438 type = TREE_TYPE (type);
7440 else if (VOID_TYPE_P (type))
7442 if (declarator->kind == cdk_reference)
7443 error ("cannot declare reference to %q#T", type);
7444 else if (declarator->kind == cdk_ptrmem)
7445 error ("cannot declare pointer to %q#T member", type);
7448 /* We now know that the TYPE_QUALS don't apply to the decl,
7449 but to the target of the pointer. */
7450 type_quals = TYPE_UNQUALIFIED;
7452 if (declarator->kind == cdk_ptrmem
7453 && (TREE_CODE (type) == FUNCTION_TYPE
7454 || (quals && TREE_CODE (type) == METHOD_TYPE)))
7458 /* If the type is a FUNCTION_TYPE, pick up the
7459 qualifiers from that function type. No other
7460 qualifiers may be supplied. */
7461 if (TREE_CODE (type) == FUNCTION_TYPE)
7462 quals = cp_type_quals (type);
7464 dummy = build_decl (TYPE_DECL, NULL_TREE, type);
7465 grok_method_quals (declarator->u.pointer.class_type,
7467 type = TREE_TYPE (dummy);
7468 quals = TYPE_UNQUALIFIED;
7471 if (declarator->kind == cdk_reference)
7473 if (!VOID_TYPE_P (type))
7474 type = build_reference_type (type);
7476 else if (TREE_CODE (type) == METHOD_TYPE)
7477 type = build_ptrmemfunc_type (build_pointer_type (type));
7478 else if (declarator->kind == cdk_ptrmem)
7480 /* We might have parsed a namespace as the class type. */
7481 if (TREE_CODE (declarator->u.pointer.class_type)
7484 error ("%qD is a namespace",
7485 declarator->u.pointer.class_type);
7486 type = build_pointer_type (type);
7488 else if (declarator->u.pointer.class_type == error_mark_node)
7489 /* We will already have complained. */
7490 type = error_mark_node;
7492 type = build_ptrmem_type (declarator->u.pointer.class_type,
7496 type = build_pointer_type (type);
7498 /* Process a list of type modifier keywords (such as
7499 const or volatile) that were given inside the `*' or `&'. */
7501 if (declarator->u.pointer.qualifiers)
7504 = cp_build_qualified_type (type,
7505 declarator->u.pointer.qualifiers);
7506 type_quals = cp_type_quals (type);
7519 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
7520 && TREE_CODE (type) != FUNCTION_TYPE
7521 && TREE_CODE (type) != METHOD_TYPE)
7523 error ("template-id %qD used as a declarator",
7525 unqualified_id = dname;
7528 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
7529 qualified with a class-name, turn it into a METHOD_TYPE, unless
7530 we know that the function is static. We take advantage of this
7531 opportunity to do other processing that pertains to entities
7532 explicitly declared to be class members. Note that if DECLARATOR
7533 is non-NULL, we know it is a cdk_id declarator; otherwise, we
7534 would not have exited the loop above. */
7536 && declarator->u.id.qualifying_scope
7537 && TYPE_P (declarator->u.id.qualifying_scope))
7541 ctype = declarator->u.id.qualifying_scope;
7542 ctype = TYPE_MAIN_VARIANT (ctype);
7544 while (t != NULL_TREE && CLASS_TYPE_P (t))
7546 /* You're supposed to have one `template <...>' for every
7547 template class, but you don't need one for a full
7548 specialization. For example:
7550 template <class T> struct S{};
7551 template <> struct S<int> { void f(); };
7552 void S<int>::f () {}
7554 is correct; there shouldn't be a `template <>' for the
7555 definition of `S<int>::f'. */
7556 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
7557 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
7558 /* T is an explicit (not partial) specialization. All
7559 containing classes must therefore also be explicitly
7562 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
7563 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
7564 template_count += 1;
7566 t = TYPE_MAIN_DECL (t);
7567 t = DECL_CONTEXT (t);
7570 if (ctype == current_class_type)
7571 pedwarn ("extra qualification %<%T::%> on member %qs",
7573 else if (TREE_CODE (type) == FUNCTION_TYPE)
7575 tree sname = declarator->u.id.unqualified_name;
7577 if (TREE_CODE (sname) == IDENTIFIER_NODE
7578 && NEW_DELETE_OPNAME_P (sname))
7579 /* Overloaded operator new and operator delete
7580 are always static functions. */
7582 else if (current_class_type == NULL_TREE || friendp)
7584 = build_method_type_directly (ctype,
7586 TYPE_ARG_TYPES (type));
7589 error ("cannot declare member function %<%T::%s%> within %<%T%>",
7590 ctype, name, current_class_type);
7591 return error_mark_node;
7594 else if (declspecs->specs[(int)ds_typedef]
7595 || COMPLETE_TYPE_P (complete_type (ctype)))
7597 /* Have to move this code elsewhere in this function.
7598 this code is used for i.e., typedef int A::M; M *pm;
7600 It is? How? jason 10/2/94 */
7602 if (current_class_type)
7604 error ("cannot declare member %<%T::%s%> within %qT",
7605 ctype, name, current_class_type);
7606 return void_type_node;
7611 cxx_incomplete_type_error (NULL_TREE, ctype);
7612 return error_mark_node;
7616 /* Now TYPE has the actual type. */
7621 *attrlist = chainon (returned_attrs, *attrlist);
7623 attrlist = &returned_attrs;
7626 /* Did array size calculations overflow? */
7628 if (TREE_CODE (type) == ARRAY_TYPE
7629 && COMPLETE_TYPE_P (type)
7630 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
7631 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
7633 error ("size of array %qs is too large", name);
7634 /* If we proceed with the array type as it is, we'll eventually
7635 crash in tree_low_cst(). */
7636 type = error_mark_node;
7639 if ((decl_context == FIELD || decl_context == PARM)
7640 && !processing_template_decl
7641 && variably_modified_type_p (type, NULL_TREE))
7643 if (decl_context == FIELD)
7644 error ("data member may not have variably modified type %qT", type);
7646 error ("parameter may not have variably modified type %qT", type);
7647 type = error_mark_node;
7650 if (explicitp == 1 || (explicitp && friendp))
7652 /* [dcl.fct.spec] The explicit specifier shall only be used in
7653 declarations of constructors within a class definition. */
7654 error ("only declarations of constructors can be %<explicit%>");
7658 if (storage_class == sc_mutable)
7660 if (decl_context != FIELD || friendp)
7662 error ("non-member %qs cannot be declared %<mutable%>", name);
7663 storage_class = sc_none;
7665 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
7667 error ("non-object member %qs cannot be declared %<mutable%>", name);
7668 storage_class = sc_none;
7670 else if (TREE_CODE (type) == FUNCTION_TYPE
7671 || TREE_CODE (type) == METHOD_TYPE)
7673 error ("function %qs cannot be declared %<mutable%>", name);
7674 storage_class = sc_none;
7678 error ("static %qs cannot be declared %<mutable%>", name);
7679 storage_class = sc_none;
7681 else if (type_quals & TYPE_QUAL_CONST)
7683 error ("const %qs cannot be declared %<mutable%>", name);
7684 storage_class = sc_none;
7688 /* If this is declaring a typedef name, return a TYPE_DECL. */
7689 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
7693 /* Note that the grammar rejects storage classes
7694 in typenames, fields or parameters. */
7695 if (current_lang_name == lang_name_java)
7696 TYPE_FOR_JAVA (type) = 1;
7698 if (decl_context == FIELD)
7699 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
7701 decl = build_decl (TYPE_DECL, unqualified_id, type);
7702 if (id_declarator && declarator->u.id.qualifying_scope)
7703 error ("%Jtypedef name may not be a nested-name-specifier", decl);
7705 if (decl_context != FIELD)
7707 if (!current_function_decl)
7708 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
7709 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
7710 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
7711 (current_function_decl)))
7712 /* The TYPE_DECL is "abstract" because there will be
7713 clones of this constructor/destructor, and there will
7714 be copies of this TYPE_DECL generated in those
7716 DECL_ABSTRACT (decl) = 1;
7718 else if (constructor_name_p (unqualified_id, current_class_type))
7719 pedwarn ("ISO C++ forbids nested type %qD with same name "
7720 "as enclosing class",
7723 /* If the user declares "typedef struct {...} foo" then the
7724 struct will have an anonymous name. Fill that name in now.
7725 Nothing can refer to it, so nothing needs know about the name
7727 if (type != error_mark_node
7730 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
7731 && TYPE_ANONYMOUS_P (type)
7732 /* Don't do this if there are attributes. */
7733 && (!attrlist || !*attrlist)
7734 && cp_type_quals (type) == TYPE_UNQUALIFIED)
7736 tree oldname = TYPE_NAME (type);
7739 /* Replace the anonymous name with the real name everywhere. */
7740 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
7741 if (TYPE_NAME (t) == oldname)
7742 TYPE_NAME (t) = decl;
7744 if (TYPE_LANG_SPECIFIC (type))
7745 TYPE_WAS_ANONYMOUS (type) = 1;
7747 /* If this is a typedef within a template class, the nested
7748 type is a (non-primary) template. The name for the
7749 template needs updating as well. */
7750 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
7751 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
7752 = TYPE_IDENTIFIER (type);
7754 /* FIXME remangle member functions; member functions of a
7755 type with external linkage have external linkage. */
7760 if (ctype == NULL_TREE)
7762 if (TREE_CODE (type) == METHOD_TYPE)
7763 ctype = TYPE_METHOD_BASETYPE (type);
7764 /* Any qualifiers on a function type typedef have
7765 already been dealt with. */
7766 else if (TREE_CODE (type) == FUNCTION_TYPE)
7767 quals = TYPE_UNQUALIFIED;
7769 if (ctype != NULL_TREE)
7770 grok_method_quals (ctype, decl, quals);
7774 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
7775 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
7777 bad_specifiers (decl, "type", virtualp, quals != TYPE_UNQUALIFIED,
7778 inlinep, friendp, raises != NULL_TREE);
7783 /* Detect the case of an array type of unspecified size
7784 which came, as such, direct from a typedef name.
7785 We must copy the type, so that the array's domain can be
7786 individually set by the object's initializer. */
7788 if (type && typedef_type
7789 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
7790 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
7791 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
7793 /* Detect where we're using a typedef of function type to declare a
7794 function. PARMS will not be set, so we must create it now. */
7796 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
7798 tree decls = NULL_TREE;
7801 for (args = TYPE_ARG_TYPES (type); args; args = TREE_CHAIN (args))
7803 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
7805 TREE_CHAIN (decl) = decls;
7809 parms = nreverse (decls);
7811 if (decl_context != TYPENAME)
7813 /* A cv-qualifier-seq shall only be part of the function type
7814 for a non-static member function. [8.3.5/4 dcl.fct] */
7815 if (cp_type_quals (type) != TYPE_UNQUALIFIED
7816 && (current_class_type == NULL_TREE || staticp) )
7818 error ("qualified function types cannot be used to declare %s functions",
7819 (staticp? "static member" : "free"));
7820 type = TYPE_MAIN_VARIANT (type);
7823 /* The qualifiers on the function type become the qualifiers on
7824 the non-static member function. */
7825 quals |= cp_type_quals (type);
7829 /* If this is a type name (such as, in a cast or sizeof),
7830 compute the type and return it now. */
7832 if (decl_context == TYPENAME)
7834 /* Note that the grammar rejects storage classes
7835 in typenames, fields or parameters. */
7836 if (type_quals != TYPE_UNQUALIFIED)
7837 type_quals = TYPE_UNQUALIFIED;
7839 /* Special case: "friend class foo" looks like a TYPENAME context. */
7842 if (type_quals != TYPE_UNQUALIFIED)
7844 error ("type qualifiers specified for friend class declaration");
7845 type_quals = TYPE_UNQUALIFIED;
7849 error ("%<inline%> specified for friend class declaration");
7855 /* Don't allow friend declaration without a class-key. */
7856 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
7857 pedwarn ("template parameters cannot be friends");
7858 else if (TREE_CODE (type) == TYPENAME_TYPE)
7859 pedwarn ("friend declaration requires class-key, "
7860 "i.e. %<friend class %T::%D%>",
7861 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
7863 pedwarn ("friend declaration requires class-key, "
7864 "i.e. %<friend %#T%>",
7868 /* Only try to do this stuff if we didn't already give up. */
7869 if (type != integer_type_node)
7871 /* A friendly class? */
7872 if (current_class_type)
7873 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
7876 error ("trying to make class %qT a friend of global scope",
7879 type = void_type_node;
7884 if (ctype == NULL_TREE)
7886 if (TREE_CODE (type) != METHOD_TYPE)
7887 error ("invalid qualifiers on non-member function type");
7889 ctype = TYPE_METHOD_BASETYPE (type);
7893 tree dummy = build_decl (TYPE_DECL, unqualified_id, type);
7894 grok_method_quals (ctype, dummy, quals);
7895 type = TREE_TYPE (dummy);
7901 else if (unqualified_id == NULL_TREE && decl_context != PARM
7902 && decl_context != CATCHPARM
7903 && TREE_CODE (type) != UNION_TYPE
7906 error ("abstract declarator %qT used as declaration", type);
7907 return error_mark_node;
7910 /* Only functions may be declared using an operator-function-id. */
7912 && IDENTIFIER_OPNAME_P (unqualified_id)
7913 && TREE_CODE (type) != FUNCTION_TYPE
7914 && TREE_CODE (type) != METHOD_TYPE)
7916 error ("declaration of %qD as non-function", unqualified_id);
7917 return error_mark_node;
7920 /* We don't check parameter types here because we can emit a better
7921 error message later. */
7922 if (decl_context != PARM)
7923 type = check_var_type (unqualified_id, type);
7925 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
7926 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
7928 if (decl_context == PARM || decl_context == CATCHPARM)
7930 if (ctype || in_namespace)
7931 error ("cannot use %<::%> in parameter declaration");
7933 /* A parameter declared as an array of T is really a pointer to T.
7934 One declared as a function is really a pointer to a function.
7935 One declared as a member is really a pointer to member. */
7937 if (TREE_CODE (type) == ARRAY_TYPE)
7939 /* Transfer const-ness of array into that of type pointed to. */
7940 type = build_pointer_type (TREE_TYPE (type));
7941 type_quals = TYPE_UNQUALIFIED;
7943 else if (TREE_CODE (type) == FUNCTION_TYPE)
7944 type = build_pointer_type (type);
7950 if (decl_context == PARM)
7952 decl = cp_build_parm_decl (unqualified_id, type);
7954 bad_specifiers (decl, "parameter", virtualp, quals != TYPE_UNQUALIFIED,
7955 inlinep, friendp, raises != NULL_TREE);
7957 else if (decl_context == FIELD)
7959 /* The C99 flexible array extension. */
7960 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
7961 && TYPE_DOMAIN (type) == NULL_TREE)
7963 tree itype = compute_array_index_type (dname, integer_zero_node);
7964 type = build_cplus_array_type (TREE_TYPE (type), itype);
7967 if (type == error_mark_node)
7969 /* Happens when declaring arrays of sizes which
7970 are error_mark_node, for example. */
7973 else if (in_namespace && !friendp)
7975 /* Something like struct S { int N::j; }; */
7976 error ("invalid use of %<::%>");
7979 else if (TREE_CODE (type) == FUNCTION_TYPE)
7982 tree function_context;
7986 if (ctype == NULL_TREE)
7987 ctype = current_class_type;
7989 if (ctype == NULL_TREE)
7991 error ("can't make %qD into a method -- not in a class",
7993 return void_type_node;
7996 /* ``A union may [ ... ] not [ have ] virtual functions.''
7998 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
8000 error ("function %qD declared virtual inside a union",
8002 return void_type_node;
8005 if (NEW_DELETE_OPNAME_P (unqualified_id))
8009 error ("%qD cannot be declared virtual, since it "
8015 else if (staticp < 2)
8016 type = build_method_type_directly (ctype,
8018 TYPE_ARG_TYPES (type));
8021 /* Check that the name used for a destructor makes sense. */
8022 if (sfk == sfk_destructor)
8026 gcc_assert (friendp);
8027 error ("expected qualified name in friend declaration "
8028 "for destructor %qD",
8029 id_declarator->u.id.unqualified_name);
8030 return error_mark_node;
8033 if (!same_type_p (TREE_OPERAND
8034 (id_declarator->u.id.unqualified_name, 0),
8037 error ("declaration of %qD as member of %qT",
8038 id_declarator->u.id.unqualified_name, ctype);
8039 return error_mark_node;
8043 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
8044 function_context = (ctype != NULL_TREE) ?
8045 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
8046 publicp = (! friendp || ! staticp)
8047 && function_context == NULL_TREE;
8048 decl = grokfndecl (ctype, type,
8049 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
8050 ? unqualified_id : dname,
8053 virtualp, flags, quals, raises,
8054 friendp ? -1 : 0, friendp, publicp, inlinep,
8056 funcdef_flag, template_count, in_namespace, attrlist);
8057 if (decl == NULL_TREE)
8060 /* This clobbers the attrs stored in `decl' from `attrlist'. */
8061 /* The decl and setting of decl_attr is also turned off. */
8062 decl = build_decl_attribute_variant (decl, decl_attr);
8065 /* [class.conv.ctor]
8067 A constructor declared without the function-specifier
8068 explicit that can be called with a single parameter
8069 specifies a conversion from the type of its first
8070 parameter to the type of its class. Such a constructor
8071 is called a converting constructor. */
8073 DECL_NONCONVERTING_P (decl) = 1;
8074 else if (DECL_CONSTRUCTOR_P (decl))
8076 /* The constructor can be called with exactly one
8077 parameter if there is at least one parameter, and
8078 any subsequent parameters have default arguments.
8079 Ignore any compiler-added parms. */
8080 tree arg_types = FUNCTION_FIRST_USER_PARMTYPE (decl);
8082 if (arg_types == void_list_node
8084 && TREE_CHAIN (arg_types)
8085 && TREE_CHAIN (arg_types) != void_list_node
8086 && !TREE_PURPOSE (TREE_CHAIN (arg_types))))
8087 DECL_NONCONVERTING_P (decl) = 1;
8090 else if (TREE_CODE (type) == METHOD_TYPE)
8092 /* We only get here for friend declarations of
8093 members of other classes. */
8094 /* All method decls are public, so tell grokfndecl to set
8095 TREE_PUBLIC, also. */
8096 decl = grokfndecl (ctype, type,
8097 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
8098 ? unqualified_id : dname,
8101 virtualp, flags, quals, raises,
8102 friendp ? -1 : 0, friendp, 1, 0, sfk,
8103 funcdef_flag, template_count, in_namespace,
8105 if (decl == NULL_TREE)
8108 else if (!staticp && !dependent_type_p (type)
8109 && !COMPLETE_TYPE_P (complete_type (type))
8110 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
8113 error ("field %qD has incomplete type", unqualified_id);
8115 error ("name %qT has incomplete type", type);
8117 /* If we're instantiating a template, tell them which
8118 instantiation made the field's type be incomplete. */
8119 if (current_class_type
8120 && TYPE_NAME (current_class_type)
8121 && IDENTIFIER_TEMPLATE (TYPE_IDENTIFIER (current_class_type))
8123 && declspecs->type == type)
8124 error (" in instantiation of template %qT",
8125 current_class_type);
8127 type = error_mark_node;
8134 error ("%qE is neither function nor member function; "
8135 "cannot be declared friend", unqualified_id);
8143 /* Friends are treated specially. */
8144 if (ctype == current_class_type)
8145 warning (0, "member functions are implicitly friends of their class");
8146 else if (decl && DECL_NAME (decl))
8148 if (template_class_depth (current_class_type) == 0)
8150 decl = check_explicit_specialization
8151 (unqualified_id, decl, template_count,
8152 2 * (funcdef_flag != 0) + 4);
8153 if (decl == error_mark_node)
8154 return error_mark_node;
8157 decl = do_friend (ctype, unqualified_id, decl,
8158 *attrlist, flags, quals, funcdef_flag);
8162 return void_type_node;
8165 /* Structure field. It may not be a function, except for C++. */
8167 if (decl == NULL_TREE)
8173 /* An attempt is being made to initialize a non-static
8174 member. But, from [class.mem]:
8176 4 A member-declarator can contain a
8177 constant-initializer only if it declares a static
8178 member (_class.static_) of integral or enumeration
8179 type, see _class.static.data_.
8181 This used to be relatively common practice, but
8182 the rest of the compiler does not correctly
8183 handle the initialization unless the member is
8184 static so we make it static below. */
8185 pedwarn ("ISO C++ forbids initialization of member %qD",
8187 pedwarn ("making %qD static", unqualified_id);
8191 if (uses_template_parms (type))
8192 /* We'll check at instantiation time. */
8194 else if (check_static_variable_definition (unqualified_id,
8196 /* If we just return the declaration, crashes
8197 will sometimes occur. We therefore return
8198 void_type_node, as if this was a friend
8199 declaration, to cause callers to completely
8200 ignore this declaration. */
8201 return void_type_node;
8206 /* C++ allows static class members. All other work
8207 for this is done by grokfield. */
8208 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
8209 set_linkage_for_static_data_member (decl);
8210 /* Even if there is an in-class initialization, DECL
8211 is considered undefined until an out-of-class
8212 definition is provided. */
8213 DECL_EXTERNAL (decl) = 1;
8217 decl = build_decl (FIELD_DECL, unqualified_id, type);
8218 DECL_NONADDRESSABLE_P (decl) = bitfield;
8219 if (storage_class == sc_mutable)
8221 DECL_MUTABLE_P (decl) = 1;
8222 storage_class = sc_none;
8226 bad_specifiers (decl, "field", virtualp, quals != TYPE_UNQUALIFIED,
8227 inlinep, friendp, raises != NULL_TREE);
8230 else if (TREE_CODE (type) == FUNCTION_TYPE
8231 || TREE_CODE (type) == METHOD_TYPE)
8236 if (!unqualified_id)
8239 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
8240 original_name = dname;
8242 original_name = unqualified_id;
8244 if (storage_class == sc_auto)
8245 error ("storage class %<auto%> invalid for function %qs", name);
8246 else if (storage_class == sc_register)
8247 error ("storage class %<register%> invalid for function %qs", name);
8249 error ("storage class %<__thread%> invalid for function %qs", name);
8251 /* Function declaration not at top level.
8252 Storage classes other than `extern' are not allowed
8253 and `extern' makes no difference. */
8254 if (! toplevel_bindings_p ()
8255 && (storage_class == sc_static
8256 || declspecs->specs[(int)ds_inline])
8259 if (storage_class == sc_static)
8260 pedwarn ("%<static%> specified invalid for function %qs "
8261 "declared out of global scope", name);
8263 pedwarn ("%<inline%> specifier invalid for function %qs "
8264 "declared out of global scope", name);
8267 if (ctype == NULL_TREE)
8271 error ("virtual non-class function %qs", name);
8275 else if (TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
8276 && !NEW_DELETE_OPNAME_P (original_name))
8277 type = build_method_type_directly (ctype,
8279 TYPE_ARG_TYPES (type));
8281 /* Record presence of `static'. */
8282 publicp = (ctype != NULL_TREE
8283 || storage_class == sc_extern
8284 || storage_class != sc_static);
8286 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
8287 virtualp, flags, quals, raises,
8289 publicp, inlinep, sfk, funcdef_flag,
8290 template_count, in_namespace, attrlist);
8291 if (decl == NULL_TREE)
8296 int invalid_static = 0;
8298 /* Don't allow a static member function in a class, and forbid
8299 declaring main to be static. */
8300 if (TREE_CODE (type) == METHOD_TYPE)
8302 pedwarn ("cannot declare member function %qD to have "
8303 "static linkage", decl);
8306 else if (current_function_decl)
8308 /* FIXME need arm citation */
8309 error ("cannot declare static function inside another function");
8316 storage_class = sc_none;
8322 /* It's a variable. */
8324 /* An uninitialized decl with `extern' is a reference. */
8325 decl = grokvardecl (type, unqualified_id,
8328 (type_quals & TYPE_QUAL_CONST) != 0,
8329 ctype ? ctype : in_namespace);
8330 bad_specifiers (decl, "variable", virtualp, quals != TYPE_UNQUALIFIED,
8331 inlinep, friendp, raises != NULL_TREE);
8335 DECL_CONTEXT (decl) = ctype;
8338 pedwarn ("%<static%> may not be used when defining "
8339 "(as opposed to declaring) a static data member");
8341 storage_class = sc_none;
8343 if (storage_class == sc_register && TREE_STATIC (decl))
8345 error ("static member %qD declared %<register%>", decl);
8346 storage_class = sc_none;
8348 if (storage_class == sc_extern && pedantic)
8350 pedwarn ("cannot explicitly declare member %q#D to have "
8353 storage_class = sc_none;
8358 /* Record `register' declaration for warnings on &
8359 and in case doing stupid register allocation. */
8361 if (storage_class == sc_register)
8362 DECL_REGISTER (decl) = 1;
8363 else if (storage_class == sc_extern)
8364 DECL_THIS_EXTERN (decl) = 1;
8365 else if (storage_class == sc_static)
8366 DECL_THIS_STATIC (decl) = 1;
8368 /* Record constancy and volatility. There's no need to do this
8369 when processing a template; we'll do this for the instantiated
8370 declaration based on the type of DECL. */
8371 if (!processing_template_decl)
8372 cp_apply_type_quals_to_decl (type_quals, decl);
8378 /* Subroutine of start_function. Ensure that each of the parameter
8379 types (as listed in PARMS) is complete, as is required for a
8380 function definition. */
8383 require_complete_types_for_parms (tree parms)
8385 for (; parms; parms = TREE_CHAIN (parms))
8387 if (dependent_type_p (TREE_TYPE (parms)))
8389 if (!VOID_TYPE_P (TREE_TYPE (parms))
8390 && complete_type_or_else (TREE_TYPE (parms), parms))
8392 relayout_decl (parms);
8393 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
8396 /* grokparms or complete_type_or_else will have already issued
8398 TREE_TYPE (parms) = error_mark_node;
8402 /* Returns nonzero if T is a local variable. */
8405 local_variable_p (tree t)
8407 if ((TREE_CODE (t) == VAR_DECL
8408 /* A VAR_DECL with a context that is a _TYPE is a static data
8410 && !TYPE_P (CP_DECL_CONTEXT (t))
8411 /* Any other non-local variable must be at namespace scope. */
8412 && !DECL_NAMESPACE_SCOPE_P (t))
8413 || (TREE_CODE (t) == PARM_DECL))
8419 /* Returns nonzero if T is an automatic local variable or a label.
8420 (These are the declarations that need to be remapped when the code
8421 containing them is duplicated.) */
8424 nonstatic_local_decl_p (tree t)
8426 return ((local_variable_p (t) && !TREE_STATIC (t))
8427 || TREE_CODE (t) == LABEL_DECL
8428 || TREE_CODE (t) == RESULT_DECL);
8431 /* Like local_variable_p, but suitable for use as a tree-walking
8435 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
8436 void *data ATTRIBUTE_UNUSED)
8438 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
8440 else if (TYPE_P (*tp))
8447 /* Check that ARG, which is a default-argument expression for a
8448 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
8449 something goes wrong. DECL may also be a _TYPE node, rather than a
8450 DECL, if there is no DECL available. */
8453 check_default_argument (tree decl, tree arg)
8458 if (TREE_CODE (arg) == DEFAULT_ARG)
8459 /* We get a DEFAULT_ARG when looking at an in-class declaration
8460 with a default argument. Ignore the argument for now; we'll
8461 deal with it after the class is complete. */
8470 decl_type = TREE_TYPE (decl);
8472 if (arg == error_mark_node
8473 || decl == error_mark_node
8474 || TREE_TYPE (arg) == error_mark_node
8475 || decl_type == error_mark_node)
8476 /* Something already went wrong. There's no need to check
8478 return error_mark_node;
8480 /* [dcl.fct.default]
8482 A default argument expression is implicitly converted to the
8484 if (!TREE_TYPE (arg)
8485 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
8488 error ("default argument for %q#D has type %qT",
8489 decl, TREE_TYPE (arg));
8491 error ("default argument for parameter of type %qT has type %qT",
8492 decl_type, TREE_TYPE (arg));
8494 return error_mark_node;
8497 /* [dcl.fct.default]
8499 Local variables shall not be used in default argument
8502 The keyword `this' shall not be used in a default argument of a
8504 var = walk_tree_without_duplicates (&arg, local_variable_p_walkfn,
8508 error ("default argument %qE uses local variable %qD", arg, var);
8509 return error_mark_node;
8516 /* Decode the list of parameter types for a function type.
8517 Given the list of things declared inside the parens,
8518 return a list of types.
8520 If this parameter does not end with an ellipsis, we append
8523 *PARMS is set to the chain of PARM_DECLs created. */
8526 grokparms (cp_parameter_declarator *first_parm, tree *parms)
8528 tree result = NULL_TREE;
8529 tree decls = NULL_TREE;
8530 int ellipsis = !first_parm || first_parm->ellipsis_p;
8531 cp_parameter_declarator *parm;
8534 for (parm = first_parm; parm != NULL; parm = parm->next)
8536 tree type = NULL_TREE;
8537 tree init = parm->default_argument;
8541 if (parm == no_parameters)
8544 attrs = parm->decl_specifiers.attributes;
8545 parm->decl_specifiers.attributes = NULL_TREE;
8546 decl = grokdeclarator (parm->declarator, &parm->decl_specifiers,
8547 PARM, init != NULL_TREE, &attrs);
8548 if (! decl || TREE_TYPE (decl) == error_mark_node)
8552 cplus_decl_attributes (&decl, attrs, 0);
8554 type = TREE_TYPE (decl);
8555 if (VOID_TYPE_P (type))
8557 if (same_type_p (type, void_type_node)
8558 && !DECL_NAME (decl) && !result && !parm->next && !ellipsis)
8559 /* this is a parmlist of `(void)', which is ok. */
8561 cxx_incomplete_type_error (decl, type);
8562 /* It's not a good idea to actually create parameters of
8563 type `void'; other parts of the compiler assume that a
8564 void type terminates the parameter list. */
8565 type = error_mark_node;
8566 TREE_TYPE (decl) = error_mark_node;
8569 if (type != error_mark_node)
8571 /* Top-level qualifiers on the parameters are
8572 ignored for function types. */
8573 type = cp_build_qualified_type (type, 0);
8574 if (TREE_CODE (type) == METHOD_TYPE)
8576 error ("parameter %qD invalidly declared method type", decl);
8577 type = build_pointer_type (type);
8578 TREE_TYPE (decl) = type;
8580 else if (abstract_virtuals_error (decl, type))
8581 any_error = 1; /* Seems like a good idea. */
8582 else if (POINTER_TYPE_P (type))
8584 /* [dcl.fct]/6, parameter types cannot contain pointers
8585 (references) to arrays of unknown bound. */
8586 tree t = TREE_TYPE (type);
8587 int ptr = TYPE_PTR_P (type);
8593 else if (TREE_CODE (t) != ARRAY_TYPE)
8595 else if (!TYPE_DOMAIN (t))
8599 if (TREE_CODE (t) == ARRAY_TYPE)
8600 error ("parameter %qD includes %s to array of unknown "
8602 decl, ptr ? "pointer" : "reference", t);
8607 else if (init && !processing_template_decl)
8608 init = check_default_argument (decl, init);
8611 TREE_CHAIN (decl) = decls;
8613 result = tree_cons (init, type, result);
8615 decls = nreverse (decls);
8616 result = nreverse (result);
8618 result = chainon (result, void_list_node);
8625 /* D is a constructor or overloaded `operator='.
8627 Let T be the class in which D is declared. Then, this function
8630 -1 if D's is an ill-formed constructor or copy assignment operator
8631 whose first parameter is of type `T'.
8632 0 if D is not a copy constructor or copy assignment
8634 1 if D is a copy constructor or copy assignment operator whose
8635 first parameter is a reference to const qualified T.
8636 2 if D is a copy constructor or copy assignment operator whose
8637 first parameter is a reference to non-const qualified T.
8639 This function can be used as a predicate. Positive values indicate
8640 a copy constructor and nonzero values indicate a copy assignment
8650 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
8652 if (DECL_TEMPLATE_INFO (d)
8653 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d)))
8654 /* Instantiations of template member functions are never copy
8655 functions. Note that member functions of templated classes are
8656 represented as template functions internally, and we must
8657 accept those as copy functions. */
8660 args = FUNCTION_FIRST_USER_PARMTYPE (d);
8664 arg_type = TREE_VALUE (args);
8666 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
8668 /* Pass by value copy assignment operator. */
8671 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
8672 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
8674 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
8680 args = TREE_CHAIN (args);
8682 if (args && args != void_list_node && !TREE_PURPOSE (args))
8683 /* There are more non-optional args. */
8689 /* Remember any special properties of member function DECL. */
8691 void grok_special_member_properties (tree decl)
8693 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P(decl))
8694 ; /* Not special. */
8695 else if (DECL_CONSTRUCTOR_P (decl))
8697 int ctor = copy_fn_p (decl);
8703 A non-template constructor for class X is a copy
8704 constructor if its first parameter is of type X&, const
8705 X&, volatile X& or const volatile X&, and either there
8706 are no other parameters or else all other parameters have
8707 default arguments. */
8708 TYPE_HAS_INIT_REF (DECL_CONTEXT (decl)) = 1;
8710 TYPE_HAS_CONST_INIT_REF (DECL_CONTEXT (decl)) = 1;
8712 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
8713 TYPE_HAS_DEFAULT_CONSTRUCTOR (DECL_CONTEXT (decl)) = 1;
8715 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
8719 A non-template assignment operator for class X is a copy
8720 assignment operator if its parameter is of type X, X&, const
8721 X&, volatile X& or const volatile X&. */
8723 int assop = copy_fn_p (decl);
8727 TYPE_HAS_ASSIGN_REF (DECL_CONTEXT (decl)) = 1;
8729 TYPE_HAS_CONST_ASSIGN_REF (DECL_CONTEXT (decl)) = 1;
8734 /* Check a constructor DECL has the correct form. Complains
8735 if the class has a constructor of the form X(X). */
8738 grok_ctor_properties (tree ctype, tree decl)
8740 int ctor_parm = copy_fn_p (decl);
8746 A declaration of a constructor for a class X is ill-formed if
8747 its first parameter is of type (optionally cv-qualified) X
8748 and either there are no other parameters or else all other
8749 parameters have default arguments.
8751 We *don't* complain about member template instantiations that
8752 have this form, though; they can occur as we try to decide
8753 what constructor to use during overload resolution. Since
8754 overload resolution will never prefer such a constructor to
8755 the non-template copy constructor (which is either explicitly
8756 or implicitly defined), there's no need to worry about their
8757 existence. Theoretically, they should never even be
8758 instantiated, but that's hard to forestall. */
8759 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
8767 /* An operator with this code is unary, but can also be binary. */
8770 ambi_op_p (enum tree_code code)
8772 return (code == INDIRECT_REF
8773 || code == ADDR_EXPR
8774 || code == UNARY_PLUS_EXPR
8775 || code == NEGATE_EXPR
8776 || code == PREINCREMENT_EXPR
8777 || code == PREDECREMENT_EXPR);
8780 /* An operator with this name can only be unary. */
8783 unary_op_p (enum tree_code code)
8785 return (code == TRUTH_NOT_EXPR
8786 || code == BIT_NOT_EXPR
8787 || code == COMPONENT_REF
8788 || code == TYPE_EXPR);
8791 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
8792 errors are issued for invalid declarations. */
8795 grok_op_properties (tree decl, bool complain)
8797 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
8799 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
8800 tree name = DECL_NAME (decl);
8801 enum tree_code operator_code;
8805 /* Count the number of arguments. */
8806 for (argtype = argtypes, arity = 0;
8807 argtype && argtype != void_list_node;
8808 argtype = TREE_CHAIN (argtype))
8811 class_type = DECL_CONTEXT (decl);
8812 if (class_type && !CLASS_TYPE_P (class_type))
8813 class_type = NULL_TREE;
8815 if (DECL_CONV_FN_P (decl))
8816 operator_code = TYPE_EXPR;
8820 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
8821 if (ansi_opname (CODE) == name) \
8823 operator_code = (CODE); \
8826 else if (ansi_assopname (CODE) == name) \
8828 operator_code = (CODE); \
8829 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
8833 #include "operators.def"
8839 gcc_assert (operator_code != LAST_CPLUS_TREE_CODE);
8840 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
8843 switch (operator_code)
8846 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
8850 TYPE_GETS_DELETE (class_type) |= 1;
8854 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
8857 case VEC_DELETE_EXPR:
8858 TYPE_GETS_DELETE (class_type) |= 2;
8865 /* [basic.std.dynamic.allocation]/1:
8867 A program is ill-formed if an allocation function is declared
8868 in a namespace scope other than global scope or declared static
8871 The same also holds true for deallocation functions. */
8872 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
8873 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
8875 if (DECL_NAMESPACE_SCOPE_P (decl))
8877 if (CP_DECL_CONTEXT (decl) != global_namespace)
8878 error ("%qD may not be declared within a namespace", decl);
8879 else if (!TREE_PUBLIC (decl))
8880 error ("%qD may not be declared as static", decl);
8884 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
8885 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
8886 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
8887 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
8890 /* An operator function must either be a non-static member function
8891 or have at least one parameter of a class, a reference to a class,
8892 an enumeration, or a reference to an enumeration. 13.4.0.6 */
8893 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
8895 if (operator_code == TYPE_EXPR
8896 || operator_code == CALL_EXPR
8897 || operator_code == COMPONENT_REF
8898 || operator_code == ARRAY_REF
8899 || operator_code == NOP_EXPR)
8901 error ("%qD must be a nonstatic member function", decl);
8908 if (DECL_STATIC_FUNCTION_P (decl))
8910 error ("%qD must be either a non-static member "
8911 "function or a non-member function", decl);
8915 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
8917 tree arg = non_reference (TREE_VALUE (p));
8918 /* IS_AGGR_TYPE, rather than CLASS_TYPE_P, is used
8919 because these checks are performed even on
8920 template functions. */
8921 if (IS_AGGR_TYPE (arg) || TREE_CODE (arg) == ENUMERAL_TYPE)
8925 if (!p || p == void_list_node)
8930 error ("%qD must have an argument of class or "
8937 /* There are no restrictions on the arguments to an overloaded
8939 if (operator_code == CALL_EXPR)
8942 /* Warn about conversion operators that will never be used. */
8943 if (IDENTIFIER_TYPENAME_P (name)
8944 && ! DECL_TEMPLATE_INFO (decl)
8946 /* Warn only declaring the function; there is no need to
8947 warn again about out-of-class definitions. */
8948 && class_type == current_class_type)
8950 tree t = TREE_TYPE (name);
8951 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
8952 const char *what = 0;
8955 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
8957 if (TREE_CODE (t) == VOID_TYPE)
8959 else if (class_type)
8961 if (t == class_type)
8962 what = "the same type";
8963 /* Don't force t to be complete here. */
8964 else if (IS_AGGR_TYPE (t)
8965 && COMPLETE_TYPE_P (t)
8966 && DERIVED_FROM_P (t, class_type))
8967 what = "a base class";
8971 warning (0, "conversion to %s%s will never use a type "
8972 "conversion operator",
8973 ref ? "a reference to " : "", what);
8975 if (operator_code == COND_EXPR)
8978 error ("ISO C++ prohibits overloading operator ?:");
8980 else if (ambi_op_p (operator_code))
8983 /* We pick the one-argument operator codes by default, so
8984 we don't have to change anything. */
8986 else if (arity == 2)
8988 /* If we thought this was a unary operator, we now know
8989 it to be a binary operator. */
8990 switch (operator_code)
8993 operator_code = MULT_EXPR;
8997 operator_code = BIT_AND_EXPR;
9000 case UNARY_PLUS_EXPR:
9001 operator_code = PLUS_EXPR;
9005 operator_code = MINUS_EXPR;
9008 case PREINCREMENT_EXPR:
9009 operator_code = POSTINCREMENT_EXPR;
9012 case PREDECREMENT_EXPR:
9013 operator_code = POSTDECREMENT_EXPR;
9020 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
9022 if ((operator_code == POSTINCREMENT_EXPR
9023 || operator_code == POSTDECREMENT_EXPR)
9024 && ! processing_template_decl
9025 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
9028 error ("postfix %qD must take %<int%> as its argument",
9032 ("postfix %qD must take %<int%> as its second argument",
9039 error ("%qD must take either zero or one argument", decl);
9041 error ("%qD must take either one or two arguments", decl);
9044 /* More Effective C++ rule 6. */
9046 && (operator_code == POSTINCREMENT_EXPR
9047 || operator_code == POSTDECREMENT_EXPR
9048 || operator_code == PREINCREMENT_EXPR
9049 || operator_code == PREDECREMENT_EXPR))
9051 tree arg = TREE_VALUE (argtypes);
9052 tree ret = TREE_TYPE (TREE_TYPE (decl));
9053 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
9054 arg = TREE_TYPE (arg);
9055 arg = TYPE_MAIN_VARIANT (arg);
9056 if (operator_code == PREINCREMENT_EXPR
9057 || operator_code == PREDECREMENT_EXPR)
9059 if (TREE_CODE (ret) != REFERENCE_TYPE
9060 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
9062 warning (0, "prefix %qD should return %qT", decl,
9063 build_reference_type (arg));
9067 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
9068 warning (0, "postfix %qD should return %qT", decl, arg);
9072 else if (unary_op_p (operator_code))
9077 error ("%qD must take %<void%>", decl);
9079 error ("%qD must take exactly one argument", decl);
9082 else /* if (binary_op_p (operator_code)) */
9087 error ("%qD must take exactly one argument", decl);
9089 error ("%qD must take exactly two arguments", decl);
9092 /* More Effective C++ rule 7. */
9094 && (operator_code == TRUTH_ANDIF_EXPR
9095 || operator_code == TRUTH_ORIF_EXPR
9096 || operator_code == COMPOUND_EXPR))
9097 warning (0, "user-defined %qD always evaluates both arguments",
9101 /* Effective C++ rule 23. */
9104 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
9105 && (operator_code == PLUS_EXPR
9106 || operator_code == MINUS_EXPR
9107 || operator_code == TRUNC_DIV_EXPR
9108 || operator_code == MULT_EXPR
9109 || operator_code == TRUNC_MOD_EXPR)
9110 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
9111 warning (0, "%qD should return by value", decl);
9114 for (; argtypes && argtypes != void_list_node;
9115 argtypes = TREE_CHAIN (argtypes))
9116 if (TREE_PURPOSE (argtypes))
9118 TREE_PURPOSE (argtypes) = NULL_TREE;
9119 if (operator_code == POSTINCREMENT_EXPR
9120 || operator_code == POSTDECREMENT_EXPR)
9123 pedwarn ("%qD cannot have default arguments", decl);
9126 error ("%qD cannot have default arguments", decl);
9133 /* Return a string giving the keyword associate with CODE. */
9136 tag_name (enum tag_types code)
9155 /* Name lookup in an elaborated-type-specifier (after the keyword
9156 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
9157 elaborated-type-specifier is invalid, issue a diagnostic and return
9158 error_mark_node; otherwise, return the *_TYPE to which it referred.
9159 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
9162 check_elaborated_type_specifier (enum tag_types tag_code,
9164 bool allow_template_p)
9170 struct S { struct S *p; };
9172 name lookup will find the TYPE_DECL for the implicit "S::S"
9173 typedef. Adjust for that here. */
9174 if (DECL_SELF_REFERENCE_P (decl))
9175 decl = TYPE_NAME (TREE_TYPE (decl));
9177 type = TREE_TYPE (decl);
9179 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
9180 is false for this case as well. */
9181 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
9183 error ("using template type parameter %qT after %qs",
9184 type, tag_name (tag_code));
9185 return error_mark_node;
9189 If the identifier resolves to a typedef-name or a template
9190 type-parameter, the elaborated-type-specifier is ill-formed.
9192 In other words, the only legitimate declaration to use in the
9193 elaborated type specifier is the implicit typedef created when
9194 the type is declared. */
9195 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
9196 && tag_code != typename_type)
9198 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
9199 error ("%q+D has a previous declaration here", decl);
9200 return error_mark_node;
9202 else if (TREE_CODE (type) != RECORD_TYPE
9203 && TREE_CODE (type) != UNION_TYPE
9204 && tag_code != enum_type
9205 && tag_code != typename_type)
9207 error ("%qT referred to as %qs", type, tag_name (tag_code));
9208 error ("%q+T has a previous declaration here", type);
9209 return error_mark_node;
9211 else if (TREE_CODE (type) != ENUMERAL_TYPE
9212 && tag_code == enum_type)
9214 error ("%qT referred to as enum", type);
9215 error ("%q+T has a previous declaration here", type);
9216 return error_mark_node;
9218 else if (!allow_template_p
9219 && TREE_CODE (type) == RECORD_TYPE
9220 && CLASSTYPE_IS_TEMPLATE (type))
9222 /* If a class template appears as elaborated type specifier
9223 without a template header such as:
9225 template <class T> class C {};
9226 void f(class C); // No template header here
9228 then the required template argument is missing. */
9229 error ("template argument required for %<%s %T%>",
9230 tag_name (tag_code),
9231 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
9232 return error_mark_node;
9238 /* Lookup NAME in elaborate type specifier in scope according to
9239 SCOPE and issue diagnostics if necessary.
9240 Return *_TYPE node upon success, NULL_TREE when the NAME is not
9241 found, and ERROR_MARK_NODE for type error. */
9244 lookup_and_check_tag (enum tag_types tag_code, tree name,
9245 tag_scope scope, bool template_header_p)
9249 if (scope == ts_global)
9251 /* First try ordinary name lookup, ignoring hidden class name
9252 injected via friend declaration. */
9253 decl = lookup_name (name, 2);
9254 /* If that fails, the name will be placed in the smallest
9255 non-class, non-function-prototype scope according to 3.3.1/5.
9256 We may already have a hidden name declared as friend in this
9257 scope. So lookup again but not ignoring hidden name.
9258 If we find one, that name will be made visible rather than
9259 creating a new tag. */
9261 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
9264 decl = lookup_type_scope (name, scope);
9266 if (decl && DECL_CLASS_TEMPLATE_P (decl))
9267 decl = DECL_TEMPLATE_RESULT (decl);
9269 if (decl && TREE_CODE (decl) == TYPE_DECL)
9271 /* Look for invalid nested type:
9275 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
9277 error ("%qD has the same name as the class in which it is "
9280 return error_mark_node;
9283 /* Two cases we need to consider when deciding if a class
9284 template is allowed as an elaborated type specifier:
9285 1. It is a self reference to its own class.
9286 2. It comes with a template header.
9290 template <class T> class C {
9291 class C *c1; // DECL_SELF_REFERENCE_P is true
9294 template <class U> class C; // template_header_p is true
9295 template <class T> class C<T>::D {
9296 class C *c2; // DECL_SELF_REFERENCE_P is true
9299 t = check_elaborated_type_specifier (tag_code,
9302 | DECL_SELF_REFERENCE_P (decl));
9309 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
9310 Define the tag as a forward-reference if it is not defined.
9312 If a declaration is given, process it here, and report an error if
9313 multiple declarations are not identical.
9315 SCOPE is TS_CURRENT when this is also a definition. Only look in
9316 the current frame for the name (since C++ allows new names in any
9317 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
9318 declaration. Only look beginning from the current scope outward up
9319 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
9321 TEMPLATE_HEADER_P is true when this declaration is preceded by
9322 a set of template parameters. */
9325 xref_tag (enum tag_types tag_code, tree name,
9326 tag_scope scope, bool template_header_p)
9328 enum tree_code code;
9330 tree context = NULL_TREE;
9332 timevar_push (TV_NAME_LOOKUP);
9334 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
9346 code = ENUMERAL_TYPE;
9352 /* In case of anonymous name, xref_tag is only called to
9353 make type node and push name. Name lookup is not required. */
9354 if (ANON_AGGRNAME_P (name))
9357 t = lookup_and_check_tag (tag_code, name,
9358 scope, template_header_p);
9360 if (t == error_mark_node)
9361 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
9363 if (scope != ts_current && t && current_class_type
9364 && template_class_depth (current_class_type)
9365 && template_header_p)
9367 /* Since SCOPE is not TS_CURRENT, we are not looking at a
9368 definition of this tag. Since, in addition, we are currently
9369 processing a (member) template declaration of a template
9370 class, we must be very careful; consider:
9377 { template <class V>
9378 friend struct S1; };
9380 Here, the S2::S1 declaration should not be confused with the
9381 outer declaration. In particular, the inner version should
9382 have a template parameter of level 2, not level 1. This
9383 would be particularly important if the member declaration
9386 template <class V = U> friend struct S1;
9388 say, when we should tsubst into `U' when instantiating
9389 S2. On the other hand, when presented with:
9399 we must find the inner binding eventually. We
9400 accomplish this by making sure that the new type we
9401 create to represent this declaration has the right
9403 context = TYPE_CONTEXT (t);
9409 /* If no such tag is yet defined, create a forward-reference node
9410 and record it as the "definition".
9411 When a real declaration of this type is found,
9412 the forward-reference will be altered into a real type. */
9413 if (code == ENUMERAL_TYPE)
9415 error ("use of enum %q#D without previous declaration", name);
9416 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
9420 t = make_aggr_type (code);
9421 TYPE_CONTEXT (t) = context;
9422 t = pushtag (name, t, scope);
9427 if (template_header_p && IS_AGGR_TYPE (t))
9428 redeclare_class_template (t, current_template_parms);
9429 else if (!processing_template_decl
9431 && CLASSTYPE_IS_TEMPLATE (t))
9433 error ("redeclaration of %qT as a non-template", t);
9434 t = error_mark_node;
9437 /* Make injected friend class visible. */
9438 if (scope != ts_within_enclosing_non_class
9439 && hidden_name_p (TYPE_NAME (t)))
9441 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
9442 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
9444 if (TYPE_TEMPLATE_INFO (t))
9446 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
9447 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
9452 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t);
9456 xref_tag_from_type (tree old, tree id, tag_scope scope)
9458 enum tag_types tag_kind;
9460 if (TREE_CODE (old) == RECORD_TYPE)
9461 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
9463 tag_kind = union_type;
9465 if (id == NULL_TREE)
9466 id = TYPE_IDENTIFIER (old);
9468 return xref_tag (tag_kind, id, scope, false);
9471 /* Create the binfo hierarchy for REF with (possibly NULL) base list
9472 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
9473 access_* node, and the TREE_VALUE is the type of the base-class.
9474 Non-NULL TREE_TYPE indicates virtual inheritance. */
9477 xref_basetypes (tree ref, tree base_list)
9480 tree binfo, base_binfo;
9481 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
9482 unsigned max_bases = 0; /* Maximum direct bases. */
9484 tree default_access;
9485 tree igo_prev; /* Track Inheritance Graph Order. */
9487 if (ref == error_mark_node)
9490 /* The base of a derived class is private by default, all others are
9492 default_access = (TREE_CODE (ref) == RECORD_TYPE
9493 && CLASSTYPE_DECLARED_CLASS (ref)
9494 ? access_private_node : access_public_node);
9496 /* First, make sure that any templates in base-classes are
9497 instantiated. This ensures that if we call ourselves recursively
9498 we do not get confused about which classes are marked and which
9503 tree basetype = TREE_VALUE (*basep);
9505 if (!(processing_template_decl && uses_template_parms (basetype))
9506 && !complete_type_or_else (basetype, NULL))
9507 /* An incomplete type. Remove it from the list. */
9508 *basep = TREE_CHAIN (*basep);
9512 if (TREE_TYPE (*basep))
9514 if (CLASS_TYPE_P (basetype))
9515 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
9516 basep = &TREE_CHAIN (*basep);
9520 TYPE_MARKED_P (ref) = 1;
9522 /* The binfo slot should be empty, unless this is an (ill-formed)
9524 gcc_assert (!TYPE_BINFO (ref) || TYPE_SIZE (ref));
9525 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
9527 binfo = make_tree_binfo (max_bases);
9529 TYPE_BINFO (ref) = binfo;
9530 BINFO_OFFSET (binfo) = size_zero_node;
9531 BINFO_TYPE (binfo) = ref;
9535 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
9536 /* An aggregate cannot have baseclasses. */
9537 CLASSTYPE_NON_AGGREGATE (ref) = 1;
9539 if (TREE_CODE (ref) == UNION_TYPE)
9540 error ("derived union %qT invalid", ref);
9545 if (TYPE_FOR_JAVA (ref))
9546 error ("Java class %qT cannot have multiple bases", ref);
9551 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
9553 if (TYPE_FOR_JAVA (ref))
9554 error ("Java class %qT cannot have virtual bases", ref);
9557 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
9559 tree access = TREE_PURPOSE (base_list);
9560 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
9561 tree basetype = TREE_VALUE (base_list);
9563 if (access == access_default_node)
9564 access = default_access;
9566 if (TREE_CODE (basetype) == TYPE_DECL)
9567 basetype = TREE_TYPE (basetype);
9568 if (TREE_CODE (basetype) != RECORD_TYPE
9569 && TREE_CODE (basetype) != TYPENAME_TYPE
9570 && TREE_CODE (basetype) != TEMPLATE_TYPE_PARM
9571 && TREE_CODE (basetype) != BOUND_TEMPLATE_TEMPLATE_PARM)
9573 error ("base type %qT fails to be a struct or class type",
9578 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
9579 TYPE_FOR_JAVA (ref) = 1;
9581 base_binfo = NULL_TREE;
9582 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
9584 base_binfo = TYPE_BINFO (basetype);
9585 /* The original basetype could have been a typedef'd type. */
9586 basetype = BINFO_TYPE (base_binfo);
9588 /* Inherit flags from the base. */
9589 TYPE_HAS_NEW_OPERATOR (ref)
9590 |= TYPE_HAS_NEW_OPERATOR (basetype);
9591 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
9592 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
9593 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
9594 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
9595 CLASSTYPE_DIAMOND_SHAPED_P (ref)
9596 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
9597 CLASSTYPE_REPEATED_BASE_P (ref)
9598 |= CLASSTYPE_REPEATED_BASE_P (basetype);
9601 /* We must do this test after we've seen through a typedef
9603 if (TYPE_MARKED_P (basetype))
9605 if (basetype == ref)
9606 error ("recursive type %qT undefined", basetype);
9608 error ("duplicate base type %qT invalid", basetype);
9611 TYPE_MARKED_P (basetype) = 1;
9613 base_binfo = copy_binfo (base_binfo, basetype, ref,
9614 &igo_prev, via_virtual);
9615 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
9616 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
9618 BINFO_BASE_APPEND (binfo, base_binfo);
9619 BINFO_BASE_ACCESS_APPEND (binfo, access);
9622 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
9623 /* If we have space in the vbase vector, we must have shared at
9624 least one of them, and are therefore diamond shaped. */
9625 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
9627 /* Unmark all the types. */
9628 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
9629 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
9630 TYPE_MARKED_P (ref) = 0;
9632 /* Now see if we have a repeated base type. */
9633 if (!CLASSTYPE_REPEATED_BASE_P (ref))
9635 for (base_binfo = binfo; base_binfo;
9636 base_binfo = TREE_CHAIN (base_binfo))
9638 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
9640 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
9643 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
9645 for (base_binfo = binfo; base_binfo;
9646 base_binfo = TREE_CHAIN (base_binfo))
9647 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
9648 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
9655 /* Begin compiling the definition of an enumeration type.
9657 Returns the type object, as yet incomplete.
9658 Also records info about it so that build_enumerator
9659 may be used to declare the individual values as they are read. */
9662 start_enum (tree name)
9666 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
9668 /* If this is the real definition for a previous forward reference,
9669 fill in the contents in the same object that used to be the
9670 forward reference. */
9672 enumtype = lookup_and_check_tag (enum_type, name,
9673 /*tag_scope=*/ts_current,
9674 /*template_header_p=*/false);
9676 if (enumtype != NULL_TREE && TREE_CODE (enumtype) == ENUMERAL_TYPE)
9678 error ("multiple definition of %q#T", enumtype);
9679 error ("%Jprevious definition here", TYPE_MAIN_DECL (enumtype));
9680 /* Clear out TYPE_VALUES, and start again. */
9681 TYPE_VALUES (enumtype) = NULL_TREE;
9685 /* In case of error, make a dummy enum to allow parsing to
9687 if (enumtype == error_mark_node)
9688 name = make_anon_name ();
9690 enumtype = make_node (ENUMERAL_TYPE);
9691 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
9697 /* After processing and defining all the values of an enumeration type,
9698 install their decls in the enumeration type and finish it off.
9699 ENUMTYPE is the type object and VALUES a list of name-value pairs. */
9702 finish_enum (tree enumtype)
9711 bool use_short_enum;
9715 integer_type_kind itk;
9716 tree underlying_type = NULL_TREE;
9718 /* We built up the VALUES in reverse order. */
9719 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
9721 /* For an enum defined in a template, just set the type of the values;
9722 all further processing is postponed until the template is
9723 instantiated. We need to set the type so that tsubst of a CONST_DECL
9725 if (processing_template_decl)
9727 for (values = TYPE_VALUES (enumtype);
9729 values = TREE_CHAIN (values))
9730 TREE_TYPE (TREE_VALUE (values)) = enumtype;
9731 if (at_function_scope_p ())
9732 add_stmt (build_min (TAG_DEFN, enumtype));
9736 /* Determine the minimum and maximum values of the enumerators. */
9737 if (TYPE_VALUES (enumtype))
9739 minnode = maxnode = NULL_TREE;
9741 for (values = TYPE_VALUES (enumtype);
9743 values = TREE_CHAIN (values))
9745 decl = TREE_VALUE (values);
9747 /* [dcl.enum]: Following the closing brace of an enum-specifier,
9748 each enumerator has the type of its enumeration. Prior to the
9749 closing brace, the type of each enumerator is the type of its
9750 initializing value. */
9751 TREE_TYPE (decl) = enumtype;
9753 /* Update the minimum and maximum values, if appropriate. */
9754 value = DECL_INITIAL (decl);
9755 if (value == error_mark_node)
9756 value = integer_zero_node;
9757 /* Figure out what the minimum and maximum values of the
9760 minnode = maxnode = value;
9761 else if (tree_int_cst_lt (maxnode, value))
9763 else if (tree_int_cst_lt (value, minnode))
9770 If the enumerator-list is empty, the underlying type is as if
9771 the enumeration had a single enumerator with value 0. */
9772 minnode = maxnode = integer_zero_node;
9774 /* Compute the number of bits require to represent all values of the
9775 enumeration. We must do this before the type of MINNODE and
9776 MAXNODE are transformed, since min_precision relies on the
9777 TREE_TYPE of the value it is passed. */
9778 unsignedp = tree_int_cst_sgn (minnode) >= 0;
9779 lowprec = min_precision (minnode, unsignedp);
9780 highprec = min_precision (maxnode, unsignedp);
9781 precision = MAX (lowprec, highprec);
9783 /* Determine the underlying type of the enumeration.
9787 The underlying type of an enumeration is an integral type that
9788 can represent all the enumerator values defined in the
9789 enumeration. It is implementation-defined which integral type is
9790 used as the underlying type for an enumeration except that the
9791 underlying type shall not be larger than int unless the value of
9792 an enumerator cannot fit in an int or unsigned int.
9794 We use "int" or an "unsigned int" as the underlying type, even if
9795 a smaller integral type would work, unless the user has
9796 explicitly requested that we use the smallest possible type. The
9797 user can request that for all enumerations with a command line
9798 flag, or for just one enumeration with an attribute. */
9800 use_short_enum = flag_short_enums
9801 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
9803 for (itk = (use_short_enum ? itk_char : itk_int);
9807 underlying_type = integer_types[itk];
9808 if (TYPE_PRECISION (underlying_type) >= precision
9809 && TYPE_UNSIGNED (underlying_type) == unsignedp)
9812 if (itk == itk_none)
9816 IF no integral type can represent all the enumerator values, the
9817 enumeration is ill-formed. */
9818 error ("no integral type can represent all of the enumerator values "
9819 "for %qT", enumtype);
9820 precision = TYPE_PRECISION (long_long_integer_type_node);
9821 underlying_type = integer_types[itk_unsigned_long_long];
9824 /* Compute the minium and maximum values for the type.
9828 For an enumeration where emin is the smallest enumerator and emax
9829 is the largest, the values of the enumeration are the values of the
9830 underlying type in the range bmin to bmax, where bmin and bmax are,
9831 respectively, the smallest and largest values of the smallest bit-
9832 field that can store emin and emax. */
9834 /* The middle-end currently assumes that types with TYPE_PRECISION
9835 narrower than their underlying type are suitably zero or sign
9836 extended to fill their mode. g++ doesn't make these guarantees.
9837 Until the middle-end can represent such paradoxical types, we
9838 set the TYPE_PRECISION to the width of the underlying type. */
9839 TYPE_PRECISION (enumtype) = TYPE_PRECISION (underlying_type);
9841 set_min_and_max_values_for_integral_type (enumtype, precision, unsignedp);
9845 The value of sizeof() applied to an enumeration type, an object
9846 of an enumeration type, or an enumerator, is the value of sizeof()
9847 applied to the underlying type. */
9848 TYPE_SIZE (enumtype) = TYPE_SIZE (underlying_type);
9849 TYPE_SIZE_UNIT (enumtype) = TYPE_SIZE_UNIT (underlying_type);
9850 TYPE_MODE (enumtype) = TYPE_MODE (underlying_type);
9851 TYPE_ALIGN (enumtype) = TYPE_ALIGN (underlying_type);
9852 TYPE_USER_ALIGN (enumtype) = TYPE_USER_ALIGN (underlying_type);
9853 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (underlying_type);
9855 /* Convert each of the enumerators to the type of the underlying
9856 type of the enumeration. */
9857 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
9859 location_t saved_location;
9861 decl = TREE_VALUE (values);
9862 saved_location = input_location;
9863 input_location = DECL_SOURCE_LOCATION (decl);
9864 value = perform_implicit_conversion (underlying_type,
9865 DECL_INITIAL (decl));
9866 input_location = saved_location;
9868 /* Do not clobber shared ints. */
9869 value = copy_node (value);
9871 TREE_TYPE (value) = enumtype;
9872 DECL_INITIAL (decl) = value;
9873 TREE_VALUE (values) = value;
9876 /* Fix up all variant types of this enum type. */
9877 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
9879 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
9880 TYPE_MIN_VALUE (t) = TYPE_MIN_VALUE (enumtype);
9881 TYPE_MAX_VALUE (t) = TYPE_MAX_VALUE (enumtype);
9882 TYPE_SIZE (t) = TYPE_SIZE (enumtype);
9883 TYPE_SIZE_UNIT (t) = TYPE_SIZE_UNIT (enumtype);
9884 TYPE_MODE (t) = TYPE_MODE (enumtype);
9885 TYPE_PRECISION (t) = TYPE_PRECISION (enumtype);
9886 TYPE_ALIGN (t) = TYPE_ALIGN (enumtype);
9887 TYPE_USER_ALIGN (t) = TYPE_USER_ALIGN (enumtype);
9888 TYPE_UNSIGNED (t) = TYPE_UNSIGNED (enumtype);
9891 /* Finish debugging output for this type. */
9892 rest_of_type_compilation (enumtype, namespace_bindings_p ());
9895 /* Build and install a CONST_DECL for an enumeration constant of the
9896 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
9897 Assignment of sequential values by default is handled here. */
9900 build_enumerator (tree name, tree value, tree enumtype)
9906 /* If the VALUE was erroneous, pretend it wasn't there; that will
9907 result in the enum being assigned the next value in sequence. */
9908 if (value == error_mark_node)
9911 /* Remove no-op casts from the value. */
9913 STRIP_TYPE_NOPS (value);
9915 if (! processing_template_decl)
9917 /* Validate and default VALUE. */
9918 if (value != NULL_TREE)
9920 value = integral_constant_value (value);
9922 if (TREE_CODE (value) == INTEGER_CST)
9924 value = perform_integral_promotions (value);
9925 constant_expression_warning (value);
9929 error ("enumerator value for %qD not integer constant", name);
9934 /* Default based on previous value. */
9935 if (value == NULL_TREE)
9937 if (TYPE_VALUES (enumtype))
9940 unsigned HOST_WIDE_INT lo;
9944 /* The next value is the previous value plus one. We can
9945 safely assume that the previous value is an INTEGER_CST.
9946 add_double doesn't know the type of the target expression,
9947 so we must check with int_fits_type_p as well. */
9948 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
9949 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
9950 TREE_INT_CST_HIGH (prev_value),
9952 value = build_int_cst_wide (TREE_TYPE (prev_value), lo, hi);
9953 overflowed |= !int_fits_type_p (value, TREE_TYPE (prev_value));
9957 error ("overflow in enumeration values at %qD", name);
9958 value = error_mark_node;
9962 value = integer_zero_node;
9965 /* Remove no-op casts from the value. */
9966 STRIP_TYPE_NOPS (value);
9969 /* C++ associates enums with global, function, or class declarations. */
9970 context = current_scope ();
9972 /* Build the actual enumeration constant. Note that the enumeration
9973 constants have the type of their initializers until the
9974 enumeration is complete:
9978 Following the closing brace of an enum-specifier, each enumer-
9979 ator has the type of its enumeration. Prior to the closing
9980 brace, the type of each enumerator is the type of its
9983 In finish_enum we will reset the type. Of course, if we're
9984 processing a template, there may be no value. */
9985 type = value ? TREE_TYPE (value) : NULL_TREE;
9987 if (context && context == current_class_type)
9988 /* This enum declaration is local to the class. We need the full
9989 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
9990 decl = build_lang_decl (CONST_DECL, name, type);
9992 /* It's a global enum, or it's local to a function. (Note local to
9993 a function could mean local to a class method. */
9994 decl = build_decl (CONST_DECL, name, type);
9996 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
9997 TREE_CONSTANT (decl) = 1;
9998 TREE_INVARIANT (decl) = 1;
9999 TREE_READONLY (decl) = 1;
10000 DECL_INITIAL (decl) = value;
10002 if (context && context == current_class_type)
10003 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
10004 on the TYPE_FIELDS list for `S'. (That's so that you can say
10005 things like `S::i' later.) */
10006 finish_member_declaration (decl);
10010 /* Add this enumeration constant to the list for this type. */
10011 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
10015 /* We're defining DECL. Make sure that it's type is OK. */
10018 check_function_type (tree decl, tree current_function_parms)
10020 tree fntype = TREE_TYPE (decl);
10021 tree return_type = complete_type (TREE_TYPE (fntype));
10023 /* In a function definition, arg types must be complete. */
10024 require_complete_types_for_parms (current_function_parms);
10026 if (dependent_type_p (return_type))
10028 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
10030 tree args = TYPE_ARG_TYPES (fntype);
10032 error ("return type %q#T is incomplete", return_type);
10034 /* Make it return void instead. */
10035 if (TREE_CODE (fntype) == METHOD_TYPE)
10036 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
10038 TREE_CHAIN (args));
10040 fntype = build_function_type (void_type_node, args);
10042 = build_exception_variant (fntype,
10043 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
10046 abstract_virtuals_error (decl, TREE_TYPE (fntype));
10049 /* Create the FUNCTION_DECL for a function definition.
10050 DECLSPECS and DECLARATOR are the parts of the declaration;
10051 they describe the function's name and the type it returns,
10052 but twisted together in a fashion that parallels the syntax of C.
10054 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
10055 DECLARATOR is really the DECL for the function we are about to
10056 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
10057 indicating that the function is an inline defined in-class.
10059 This function creates a binding context for the function body
10060 as well as setting up the FUNCTION_DECL in current_function_decl.
10062 For C++, we must first check whether that datum makes any sense.
10063 For example, "class A local_a(1,2);" means that variable local_a
10064 is an aggregate of type A, which should have a constructor
10065 applied to it with the argument list [1, 2]. */
10068 start_preparsed_function (tree decl1, tree attrs, int flags)
10070 tree ctype = NULL_TREE;
10073 int doing_friend = 0;
10074 struct cp_binding_level *bl;
10075 tree current_function_parms;
10076 struct c_fileinfo *finfo
10077 = get_fileinfo (lbasename (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1))));
10078 bool honor_interface;
10080 /* Sanity check. */
10081 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
10082 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
10084 fntype = TREE_TYPE (decl1);
10085 if (TREE_CODE (fntype) == METHOD_TYPE)
10086 ctype = TYPE_METHOD_BASETYPE (fntype);
10088 /* ISO C++ 11.4/5. A friend function defined in a class is in
10089 the (lexical) scope of the class in which it is defined. */
10090 if (!ctype && DECL_FRIEND_P (decl1))
10092 ctype = DECL_FRIEND_CONTEXT (decl1);
10094 /* CTYPE could be null here if we're dealing with a template;
10095 for example, `inline friend float foo()' inside a template
10096 will have no CTYPE set. */
10097 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
10103 if (DECL_DECLARED_INLINE_P (decl1)
10104 && lookup_attribute ("noinline", attrs))
10105 warning (0, "inline function %q+D given attribute noinline", decl1);
10107 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
10108 /* This is a constructor, we must ensure that any default args
10109 introduced by this definition are propagated to the clones
10110 now. The clones are used directly in overload resolution. */
10111 adjust_clone_args (decl1);
10113 /* Sometimes we don't notice that a function is a static member, and
10114 build a METHOD_TYPE for it. Fix that up now. */
10115 if (ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
10116 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE)
10118 revert_static_member_fn (decl1);
10122 /* Set up current_class_type, and enter the scope of the class, if
10125 push_nested_class (ctype);
10126 else if (DECL_STATIC_FUNCTION_P (decl1))
10127 push_nested_class (DECL_CONTEXT (decl1));
10129 /* Now that we have entered the scope of the class, we must restore
10130 the bindings for any template parameters surrounding DECL1, if it
10131 is an inline member template. (Order is important; consider the
10132 case where a template parameter has the same name as a field of
10133 the class.) It is not until after this point that
10134 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
10135 if (flags & SF_INCLASS_INLINE)
10136 maybe_begin_member_template_processing (decl1);
10138 /* Effective C++ rule 15. */
10140 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
10141 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
10142 warning (0, "%<operator=%> should return a reference to %<*this%>");
10144 /* Make the init_value nonzero so pushdecl knows this is not tentative.
10145 error_mark_node is replaced below (in poplevel) with the BLOCK. */
10146 if (!DECL_INITIAL (decl1))
10147 DECL_INITIAL (decl1) = error_mark_node;
10149 /* This function exists in static storage.
10150 (This does not mean `static' in the C sense!) */
10151 TREE_STATIC (decl1) = 1;
10153 /* We must call push_template_decl after current_class_type is set
10154 up. (If we are processing inline definitions after exiting a
10155 class scope, current_class_type will be NULL_TREE until set above
10156 by push_nested_class.) */
10157 if (processing_template_decl)
10159 /* FIXME: Handle error_mark_node more gracefully. */
10160 tree newdecl1 = push_template_decl (decl1);
10161 if (newdecl1 != error_mark_node)
10165 /* We are now in the scope of the function being defined. */
10166 current_function_decl = decl1;
10168 /* Save the parm names or decls from this function's declarator
10169 where store_parm_decls will find them. */
10170 current_function_parms = DECL_ARGUMENTS (decl1);
10172 /* Make sure the parameter and return types are reasonable. When
10173 you declare a function, these types can be incomplete, but they
10174 must be complete when you define the function. */
10175 check_function_type (decl1, current_function_parms);
10177 /* Build the return declaration for the function. */
10178 restype = TREE_TYPE (fntype);
10179 /* Promote the value to int before returning it. */
10180 if (c_promoting_integer_type_p (restype))
10181 restype = type_promotes_to (restype);
10182 if (DECL_RESULT (decl1) == NULL_TREE)
10186 resdecl = build_decl (RESULT_DECL, 0, TYPE_MAIN_VARIANT (restype));
10187 DECL_ARTIFICIAL (resdecl) = 1;
10188 DECL_IGNORED_P (resdecl) = 1;
10189 DECL_RESULT (decl1) = resdecl;
10191 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
10194 /* Initialize RTL machinery. We cannot do this until
10195 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
10196 even when processing a template; this is how we get
10197 CFUN set up, and our per-function variables initialized.
10198 FIXME factor out the non-RTL stuff. */
10199 bl = current_binding_level;
10200 allocate_struct_function (decl1);
10201 current_binding_level = bl;
10203 /* Even though we're inside a function body, we still don't want to
10204 call expand_expr to calculate the size of a variable-sized array.
10205 We haven't necessarily assigned RTL to all variables yet, so it's
10206 not safe to try to expand expressions involving them. */
10207 cfun->x_dont_save_pending_sizes_p = 1;
10209 /* Start the statement-tree, start the tree now. */
10210 DECL_SAVED_TREE (decl1) = push_stmt_list ();
10212 /* Let the user know we're compiling this function. */
10213 announce_function (decl1);
10215 /* Record the decl so that the function name is defined.
10216 If we already have a decl for this name, and it is a FUNCTION_DECL,
10217 use the old decl. */
10218 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
10220 /* A specialization is not used to guide overload resolution. */
10221 if (!DECL_FUNCTION_MEMBER_P (decl1)
10222 && !(DECL_USE_TEMPLATE (decl1) &&
10223 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
10225 tree olddecl = pushdecl (decl1);
10227 if (olddecl == error_mark_node)
10228 /* If something went wrong when registering the declaration,
10229 use DECL1; we have to have a FUNCTION_DECL to use when
10230 parsing the body of the function. */
10233 /* Otherwise, OLDDECL is either a previous declaration of
10234 the same function or DECL1 itself. */
10239 /* We need to set the DECL_CONTEXT. */
10240 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
10241 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
10242 /* And make sure we have enough default args. */
10243 check_default_args (decl1);
10245 fntype = TREE_TYPE (decl1);
10248 /* Determine the ELF visibility attribute for the function. We must
10249 not do this before calling "pushdecl", as we must allow
10250 "duplicate_decls" to merge any attributes appropriately. */
10251 if (!DECL_CLONED_FUNCTION_P (decl1))
10252 determine_visibility (decl1);
10254 /* Reset these in case the call to pushdecl changed them. */
10255 current_function_decl = decl1;
10256 cfun->decl = decl1;
10258 /* If we are (erroneously) defining a function that we have already
10259 defined before, wipe out what we knew before. */
10260 if (!DECL_PENDING_INLINE_P (decl1))
10261 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
10263 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
10265 /* We know that this was set up by `grokclassfn'. We do not
10266 wait until `store_parm_decls', since evil parse errors may
10267 never get us to that point. Here we keep the consistency
10268 between `current_class_type' and `current_class_ptr'. */
10269 tree t = DECL_ARGUMENTS (decl1);
10271 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
10272 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
10274 cp_function_chain->x_current_class_ref
10275 = build_indirect_ref (t, NULL);
10276 cp_function_chain->x_current_class_ptr = t;
10278 /* Constructors and destructors need to know whether they're "in
10279 charge" of initializing virtual base classes. */
10280 t = TREE_CHAIN (t);
10281 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
10283 current_in_charge_parm = t;
10284 t = TREE_CHAIN (t);
10286 if (DECL_HAS_VTT_PARM_P (decl1))
10288 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
10289 current_vtt_parm = t;
10293 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
10294 /* Implicitly-defined methods (like the
10295 destructor for a class in which no destructor
10296 is explicitly declared) must not be defined
10297 until their definition is needed. So, we
10298 ignore interface specifications for
10299 compiler-generated functions. */
10300 && !DECL_ARTIFICIAL (decl1));
10302 if (DECL_INTERFACE_KNOWN (decl1))
10304 tree ctx = decl_function_context (decl1);
10306 if (DECL_NOT_REALLY_EXTERN (decl1))
10307 DECL_EXTERNAL (decl1) = 0;
10309 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
10310 && TREE_PUBLIC (ctx))
10311 /* This is a function in a local class in an extern inline
10313 comdat_linkage (decl1);
10315 /* If this function belongs to an interface, it is public.
10316 If it belongs to someone else's interface, it is also external.
10317 This only affects inlines and template instantiations. */
10318 else if (!finfo->interface_unknown && honor_interface)
10320 if (DECL_DECLARED_INLINE_P (decl1)
10321 || DECL_TEMPLATE_INSTANTIATION (decl1)
10322 || processing_template_decl)
10324 DECL_EXTERNAL (decl1)
10325 = (finfo->interface_only
10326 || (DECL_DECLARED_INLINE_P (decl1)
10327 && ! flag_implement_inlines
10328 && !DECL_VINDEX (decl1)));
10330 /* For WIN32 we also want to put these in linkonce sections. */
10331 maybe_make_one_only (decl1);
10334 DECL_EXTERNAL (decl1) = 0;
10335 DECL_INTERFACE_KNOWN (decl1) = 1;
10336 /* If this function is in an interface implemented in this file,
10337 make sure that the backend knows to emit this function
10339 if (!DECL_EXTERNAL (decl1))
10340 mark_needed (decl1);
10342 else if (finfo->interface_unknown && finfo->interface_only
10343 && honor_interface)
10345 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
10346 interface, we will have both finfo->interface_unknown and
10347 finfo->interface_only set. In that case, we don't want to
10348 use the normal heuristics because someone will supply a
10349 #pragma implementation elsewhere, and deducing it here would
10350 produce a conflict. */
10351 comdat_linkage (decl1);
10352 DECL_EXTERNAL (decl1) = 0;
10353 DECL_INTERFACE_KNOWN (decl1) = 1;
10354 DECL_DEFER_OUTPUT (decl1) = 1;
10358 /* This is a definition, not a reference.
10359 So clear DECL_EXTERNAL. */
10360 DECL_EXTERNAL (decl1) = 0;
10362 if ((DECL_DECLARED_INLINE_P (decl1)
10363 || DECL_TEMPLATE_INSTANTIATION (decl1))
10364 && ! DECL_INTERFACE_KNOWN (decl1)
10365 /* Don't try to defer nested functions for now. */
10366 && ! decl_function_context (decl1))
10367 DECL_DEFER_OUTPUT (decl1) = 1;
10369 DECL_INTERFACE_KNOWN (decl1) = 1;
10372 begin_scope (sk_function_parms, decl1);
10376 if (DECL_DESTRUCTOR_P (decl1)
10377 || (DECL_CONSTRUCTOR_P (decl1)
10378 && targetm.cxx.cdtor_returns_this ()))
10380 cdtor_label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
10381 DECL_CONTEXT (cdtor_label) = current_function_decl;
10384 start_fname_decls ();
10386 store_parm_decls (current_function_parms);
10390 /* Like start_preparsed_function, except that instead of a
10391 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
10393 Returns 1 on success. If the DECLARATOR is not suitable for a function
10394 (it defines a datum instead), we return 0, which tells
10395 yyparse to report a parse error. */
10398 start_function (cp_decl_specifier_seq *declspecs,
10399 const cp_declarator *declarator,
10404 if (have_extern_spec)
10406 declspecs->storage_class = sc_extern;
10407 /* This should only be done once on the outermost decl. */
10408 have_extern_spec = false;
10411 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
10412 /* If the declarator is not suitable for a function definition,
10413 cause a syntax error. */
10414 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
10417 /* If #pragma weak was used, mark the decl weak now. */
10418 if (global_scope_p (current_binding_level))
10419 maybe_apply_pragma_weak (decl1);
10421 if (DECL_MAIN_P (decl1))
10422 /* main must return int. grokfndecl should have corrected it
10423 (and issued a diagnostic) if the user got it wrong. */
10424 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
10425 integer_type_node));
10427 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
10432 /* Store the parameter declarations into the current function declaration.
10433 This is called after parsing the parameter declarations, before
10434 digesting the body of the function.
10436 Also install to binding contour return value identifier, if any. */
10439 store_parm_decls (tree current_function_parms)
10441 tree fndecl = current_function_decl;
10444 /* This is a chain of any other decls that came in among the parm
10445 declarations. If a parm is declared with enum {foo, bar} x;
10446 then CONST_DECLs for foo and bar are put here. */
10447 tree nonparms = NULL_TREE;
10449 if (current_function_parms)
10451 /* This case is when the function was defined with an ANSI prototype.
10452 The parms already have decls, so we need not do anything here
10453 except record them as in effect
10454 and complain if any redundant old-style parm decls were written. */
10456 tree specparms = current_function_parms;
10459 /* Must clear this because it might contain TYPE_DECLs declared
10461 current_binding_level->names = NULL;
10463 /* If we're doing semantic analysis, then we'll call pushdecl
10464 for each of these. We must do them in reverse order so that
10465 they end in the correct forward order. */
10466 specparms = nreverse (specparms);
10468 for (parm = specparms; parm; parm = next)
10470 next = TREE_CHAIN (parm);
10471 if (TREE_CODE (parm) == PARM_DECL)
10473 if (DECL_NAME (parm) == NULL_TREE
10474 || TREE_CODE (parm) != VOID_TYPE)
10477 error ("parameter %qD declared void", parm);
10481 /* If we find an enum constant or a type tag,
10482 put it aside for the moment. */
10483 TREE_CHAIN (parm) = NULL_TREE;
10484 nonparms = chainon (nonparms, parm);
10488 /* Get the decls in their original chain order and record in the
10489 function. This is all and only the PARM_DECLs that were
10490 pushed into scope by the loop above. */
10491 DECL_ARGUMENTS (fndecl) = getdecls ();
10494 DECL_ARGUMENTS (fndecl) = NULL_TREE;
10496 /* Now store the final chain of decls for the arguments
10497 as the decl-chain of the current lexical scope.
10498 Put the enumerators in as well, at the front so that
10499 DECL_ARGUMENTS is not modified. */
10500 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
10502 /* For a cloned function, we've already got all the code we need;
10503 there's no need to add any extra bits. */
10504 if (!DECL_CLONED_FUNCTION_P (fndecl))
10506 /* Do the starting of the exception specifications, if we have any. */
10507 if (flag_exceptions && !processing_template_decl
10508 && flag_enforce_eh_specs
10509 && TYPE_RAISES_EXCEPTIONS (TREE_TYPE (current_function_decl)))
10510 current_eh_spec_block = begin_eh_spec_block ();
10515 /* We have finished doing semantic analysis on DECL, but have not yet
10516 generated RTL for its body. Save away our current state, so that
10517 when we want to generate RTL later we know what to do. */
10520 save_function_data (tree decl)
10522 struct language_function *f;
10524 /* Save the language-specific per-function data so that we can
10525 get it back when we really expand this function. */
10526 gcc_assert (!DECL_PENDING_INLINE_P (decl));
10529 f = GGC_NEW (struct language_function);
10530 memcpy (f, cp_function_chain, sizeof (struct language_function));
10531 DECL_SAVED_FUNCTION_DATA (decl) = f;
10533 /* Clear out the bits we don't need. */
10534 f->base.x_stmt_tree.x_cur_stmt_list = NULL_TREE;
10535 f->x_named_label_uses = NULL;
10536 f->bindings = NULL;
10537 f->x_local_names = NULL;
10541 /* Set the return value of the constructor (if present). */
10544 finish_constructor_body (void)
10549 if (targetm.cxx.cdtor_returns_this ())
10551 /* Any return from a constructor will end up here. */
10552 add_stmt (build_stmt (LABEL_EXPR, cdtor_label));
10554 val = DECL_ARGUMENTS (current_function_decl);
10555 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
10556 DECL_RESULT (current_function_decl), val);
10557 /* Return the address of the object. */
10558 exprstmt = build_stmt (RETURN_EXPR, val);
10559 add_stmt (exprstmt);
10563 /* Do all the processing for the beginning of a destructor; set up the
10564 vtable pointers and cleanups for bases and members. */
10567 begin_destructor_body (void)
10570 tree compound_stmt;
10572 /* If the dtor is empty, and we know there is not any possible
10573 way we could use any vtable entries, before they are possibly
10574 set by a base class dtor, we don't have to setup the vtables,
10575 as we know that any base class dtor will set up any vtables
10576 it needs. We avoid MI, because one base class dtor can do a
10577 virtual dispatch to an overridden function that would need to
10578 have a non-related vtable set up, we cannot avoid setting up
10579 vtables in that case. We could change this to see if there
10580 is just one vtable.
10582 ??? In the destructor for a class, the vtables are set
10583 appropriately for that class. There will be no non-related
10584 vtables. jason 2001-12-11. */
10585 if_stmt = begin_if_stmt ();
10587 /* If it is not safe to avoid setting up the vtables, then
10588 someone will change the condition to be boolean_true_node.
10589 (Actually, for now, we do not have code to set the condition
10590 appropriately, so we just assume that we always need to
10591 initialize the vtables.) */
10592 finish_if_stmt_cond (boolean_true_node, if_stmt);
10594 compound_stmt = begin_compound_stmt (0);
10596 /* Make all virtual function table pointers in non-virtual base
10597 classes point to CURRENT_CLASS_TYPE's virtual function
10599 initialize_vtbl_ptrs (current_class_ptr);
10601 finish_compound_stmt (compound_stmt);
10602 finish_then_clause (if_stmt);
10603 finish_if_stmt (if_stmt);
10605 /* And insert cleanups for our bases and members so that they
10606 will be properly destroyed if we throw. */
10607 push_base_cleanups ();
10610 /* At the end of every destructor we generate code to delete the object if
10611 necessary. Do that now. */
10614 finish_destructor_body (void)
10618 /* Any return from a destructor will end up here; that way all base
10619 and member cleanups will be run when the function returns. */
10620 add_stmt (build_stmt (LABEL_EXPR, cdtor_label));
10622 /* In a virtual destructor, we must call delete. */
10623 if (DECL_VIRTUAL_P (current_function_decl))
10626 tree virtual_size = cxx_sizeof (current_class_type);
10630 At the point of definition of a virtual destructor (including
10631 an implicit definition), non-placement operator delete shall
10632 be looked up in the scope of the destructor's class and if
10633 found shall be accessible and unambiguous. */
10634 exprstmt = build_op_delete_call
10635 (DELETE_EXPR, current_class_ptr, virtual_size,
10636 /*global_p=*/false, NULL_TREE);
10638 if_stmt = begin_if_stmt ();
10639 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
10640 current_in_charge_parm,
10643 finish_expr_stmt (exprstmt);
10644 finish_then_clause (if_stmt);
10645 finish_if_stmt (if_stmt);
10648 if (targetm.cxx.cdtor_returns_this ())
10652 val = DECL_ARGUMENTS (current_function_decl);
10653 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
10654 DECL_RESULT (current_function_decl), val);
10655 /* Return the address of the object. */
10656 exprstmt = build_stmt (RETURN_EXPR, val);
10657 add_stmt (exprstmt);
10661 /* Do the necessary processing for the beginning of a function body, which
10662 in this case includes member-initializers, but not the catch clauses of
10663 a function-try-block. Currently, this means opening a binding level
10664 for the member-initializers (in a ctor) and member cleanups (in a dtor). */
10667 begin_function_body (void)
10671 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
10674 if (processing_template_decl)
10675 /* Do nothing now. */;
10677 /* Always keep the BLOCK node associated with the outermost pair of
10678 curly braces of a function. These are needed for correct
10679 operation of dwarfout.c. */
10680 keep_next_level (true);
10682 stmt = begin_compound_stmt (BCS_FN_BODY);
10684 if (processing_template_decl)
10685 /* Do nothing now. */;
10686 else if (DECL_DESTRUCTOR_P (current_function_decl))
10687 begin_destructor_body ();
10692 /* Do the processing for the end of a function body. Currently, this means
10693 closing out the cleanups for fully-constructed bases and members, and in
10694 the case of the destructor, deleting the object if desired. Again, this
10695 is only meaningful for [cd]tors, since they are the only functions where
10696 there is a significant distinction between the main body and any
10697 function catch clauses. Handling, say, main() return semantics here
10698 would be wrong, as flowing off the end of a function catch clause for
10699 main() would also need to return 0. */
10702 finish_function_body (tree compstmt)
10704 if (compstmt == NULL_TREE)
10707 /* Close the block. */
10708 finish_compound_stmt (compstmt);
10710 if (processing_template_decl)
10711 /* Do nothing now. */;
10712 else if (DECL_CONSTRUCTOR_P (current_function_decl))
10713 finish_constructor_body ();
10714 else if (DECL_DESTRUCTOR_P (current_function_decl))
10715 finish_destructor_body ();
10718 /* Given a function, returns the BLOCK corresponding to the outermost level
10719 of curly braces, skipping the artificial block created for constructor
10723 outer_curly_brace_block (tree fndecl)
10725 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
10726 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
10727 /* Skip the artificial function body block. */
10728 block = BLOCK_SUBBLOCKS (block);
10732 /* Finish up a function declaration and compile that function
10733 all the way to assembler language output. The free the storage
10734 for the function definition.
10736 FLAGS is a bitwise or of the following values:
10738 We just finished processing the body of an in-class inline
10739 function definition. (This processing will have taken place
10740 after the class definition is complete.) */
10743 finish_function (int flags)
10745 tree fndecl = current_function_decl;
10746 tree fntype, ctype = NULL_TREE;
10747 int inclass_inline = (flags & 2) != 0;
10750 /* When we get some parse errors, we can end up without a
10751 current_function_decl, so cope. */
10752 if (fndecl == NULL_TREE)
10753 return error_mark_node;
10755 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
10756 && DECL_VIRTUAL_P (fndecl)
10757 && !processing_template_decl)
10759 tree fnclass = DECL_CONTEXT (fndecl);
10760 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
10761 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
10764 nested = function_depth > 1;
10765 fntype = TREE_TYPE (fndecl);
10767 /* TREE_READONLY (fndecl) = 1;
10768 This caused &foo to be of type ptr-to-const-function
10769 which then got a warning when stored in a ptr-to-function variable. */
10771 gcc_assert (building_stmt_tree ());
10773 /* For a cloned function, we've already got all the code we need;
10774 there's no need to add any extra bits. */
10775 if (!DECL_CLONED_FUNCTION_P (fndecl))
10777 if (DECL_MAIN_P (current_function_decl))
10781 /* Make it so that `main' always returns 0 by default (or
10784 stmt = finish_return_stmt (integer_one_node);
10786 stmt = finish_return_stmt (integer_zero_node);
10788 /* Hack. We don't want the middle-end to warn that this
10789 return is unreachable, so put the statement on the
10791 #ifdef USE_MAPPED_LOCATION
10792 SET_EXPR_LOCATION (stmt, UNKNOWN_LOCATION);
10794 annotate_with_file_line (stmt, input_filename, 0);
10798 /* Finish dealing with exception specifiers. */
10799 if (flag_exceptions && !processing_template_decl
10800 && flag_enforce_eh_specs
10801 && TYPE_RAISES_EXCEPTIONS (TREE_TYPE (current_function_decl)))
10802 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
10803 (TREE_TYPE (current_function_decl)),
10804 current_eh_spec_block);
10807 /* If we're saving up tree structure, tie off the function now. */
10808 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
10810 finish_fname_decls ();
10812 /* If this function can't throw any exceptions, remember that. */
10813 if (!processing_template_decl
10814 && !cp_function_chain->can_throw
10815 && !flag_non_call_exceptions)
10816 TREE_NOTHROW (fndecl) = 1;
10818 /* This must come after expand_function_end because cleanups might
10819 have declarations (from inline functions) that need to go into
10820 this function's blocks. */
10822 /* If the current binding level isn't the outermost binding level
10823 for this function, either there is a bug, or we have experienced
10824 syntax errors and the statement tree is malformed. */
10825 if (current_binding_level->kind != sk_function_parms)
10827 /* Make sure we have already experienced errors. */
10828 gcc_assert (errorcount);
10830 /* Throw away the broken statement tree and extra binding
10832 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
10834 while (current_binding_level->kind != sk_function_parms)
10836 if (current_binding_level->kind == sk_class)
10837 pop_nested_class ();
10839 poplevel (0, 0, 0);
10842 poplevel (1, 0, 1);
10844 /* Statements should always be full-expressions at the outermost set
10845 of curly braces for a function. */
10846 gcc_assert (stmts_are_full_exprs_p ());
10848 /* Set up the named return value optimization, if we can. Candidate
10849 variables are selected in check_return_value. */
10850 if (current_function_return_value)
10852 tree r = current_function_return_value;
10855 if (r != error_mark_node
10856 /* This is only worth doing for fns that return in memory--and
10857 simpler, since we don't have to worry about promoted modes. */
10858 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
10859 /* Only allow this for variables declared in the outer scope of
10860 the function so we know that their lifetime always ends with a
10861 return; see g++.dg/opt/nrv6.C. We could be more flexible if
10862 we were to do this optimization in tree-ssa. */
10863 && (outer = outer_curly_brace_block (fndecl))
10864 && chain_member (r, BLOCK_VARS (outer)))
10865 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
10867 current_function_return_value = NULL_TREE;
10870 /* Remember that we were in class scope. */
10871 if (current_class_name)
10872 ctype = current_class_type;
10874 /* Must mark the RESULT_DECL as being in this function. */
10875 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
10877 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
10878 to the FUNCTION_DECL node itself. */
10879 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
10881 /* Save away current state, if appropriate. */
10882 if (!processing_template_decl)
10883 save_function_data (fndecl);
10885 /* Complain if there's just no return statement. */
10886 if (warn_return_type
10887 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
10888 && !dependent_type_p (TREE_TYPE (fntype))
10889 && !current_function_returns_value && !current_function_returns_null
10890 /* Don't complain if we abort or throw. */
10891 && !current_function_returns_abnormally
10892 && !DECL_NAME (DECL_RESULT (fndecl))
10893 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
10894 inline function, as we might never be compiled separately. */
10895 && (DECL_INLINE (fndecl) || processing_template_decl)
10896 /* Structor return values (if any) are set by the compiler. */
10897 && !DECL_CONSTRUCTOR_P (fndecl)
10898 && !DECL_DESTRUCTOR_P (fndecl))
10899 warning (0, "no return statement in function returning non-void");
10901 /* Store the end of the function, so that we get good line number
10902 info for the epilogue. */
10903 cfun->function_end_locus = input_location;
10905 /* Genericize before inlining. */
10906 if (!processing_template_decl)
10908 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
10909 cp_genericize (fndecl);
10910 /* Clear out the bits we don't need. */
10911 f->x_current_class_ptr = NULL;
10912 f->x_current_class_ref = NULL;
10913 f->x_eh_spec_block = NULL;
10914 f->x_in_charge_parm = NULL;
10915 f->x_vtt_parm = NULL;
10916 f->x_return_value = NULL;
10917 f->bindings = NULL;
10919 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
10920 c_warn_unused_result (&DECL_SAVED_TREE (fndecl));
10922 /* Clear out the bits we don't need. */
10923 local_names = NULL;
10924 named_label_uses = NULL;
10926 /* We're leaving the context of this function, so zap cfun. It's still in
10927 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
10929 current_function_decl = NULL;
10931 /* If this is an in-class inline definition, we may have to pop the
10932 bindings for the template parameters that we added in
10933 maybe_begin_member_template_processing when start_function was
10935 if (inclass_inline)
10936 maybe_end_member_template_processing ();
10938 /* Leave the scope of the class. */
10940 pop_nested_class ();
10946 /* Let the error reporting routines know that we're outside a
10947 function. For a nested function, this value is used in
10948 cxx_pop_function_context and then reset via pop_function_context. */
10949 current_function_decl = NULL_TREE;
10954 /* Create the FUNCTION_DECL for a function definition.
10955 DECLSPECS and DECLARATOR are the parts of the declaration;
10956 they describe the return type and the name of the function,
10957 but twisted together in a fashion that parallels the syntax of C.
10959 This function creates a binding context for the function body
10960 as well as setting up the FUNCTION_DECL in current_function_decl.
10962 Returns a FUNCTION_DECL on success.
10964 If the DECLARATOR is not suitable for a function (it defines a datum
10965 instead), we return 0, which tells yyparse to report a parse error.
10967 May return void_type_node indicating that this method is actually
10968 a friend. See grokfield for more details.
10970 Came here with a `.pushlevel' .
10972 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
10973 CHANGES TO CODE IN `grokfield'. */
10976 start_method (cp_decl_specifier_seq *declspecs,
10977 const cp_declarator *declarator, tree attrlist)
10979 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
10982 if (fndecl == error_mark_node)
10983 return error_mark_node;
10985 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
10987 error ("invalid member function declaration");
10988 return error_mark_node;
10992 cplus_decl_attributes (&fndecl, attrlist, 0);
10994 /* Pass friends other than inline friend functions back. */
10995 if (fndecl == void_type_node)
10998 if (DECL_IN_AGGR_P (fndecl))
11000 if (DECL_CONTEXT (fndecl)
11001 && TREE_CODE( DECL_CONTEXT (fndecl)) != NAMESPACE_DECL)
11002 error ("%qD is already defined in class %qT", fndecl,
11003 DECL_CONTEXT (fndecl));
11004 return error_mark_node;
11007 check_template_shadow (fndecl);
11009 DECL_DECLARED_INLINE_P (fndecl) = 1;
11010 if (flag_default_inline)
11011 DECL_INLINE (fndecl) = 1;
11013 /* We process method specializations in finish_struct_1. */
11014 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
11016 fndecl = push_template_decl (fndecl);
11017 if (fndecl == error_mark_node)
11021 if (! DECL_FRIEND_P (fndecl))
11023 if (TREE_CHAIN (fndecl))
11025 fndecl = copy_node (fndecl);
11026 TREE_CHAIN (fndecl) = NULL_TREE;
11028 grok_special_member_properties (fndecl);
11031 cp_finish_decl (fndecl, NULL_TREE, NULL_TREE, 0);
11033 /* Make a place for the parms. */
11034 begin_scope (sk_function_parms, fndecl);
11036 DECL_IN_AGGR_P (fndecl) = 1;
11040 /* Go through the motions of finishing a function definition.
11041 We don't compile this method until after the whole class has
11044 FINISH_METHOD must return something that looks as though it
11045 came from GROKFIELD (since we are defining a method, after all).
11047 This is called after parsing the body of the function definition.
11048 STMTS is the chain of statements that makes up the function body.
11050 DECL is the ..._DECL that `start_method' provided. */
11053 finish_method (tree decl)
11055 tree fndecl = decl;
11060 if (decl == void_type_node)
11063 old_initial = DECL_INITIAL (fndecl);
11065 /* Undo the level for the parms (from start_method).
11066 This is like poplevel, but it causes nothing to be
11067 saved. Saving information here confuses symbol-table
11068 output routines. Besides, this information will
11069 be correctly output when this method is actually
11072 /* Clear out the meanings of the local variables of this level;
11073 also record in each decl which block it belongs to. */
11075 for (link = current_binding_level->names; link; link = TREE_CHAIN (link))
11077 if (DECL_NAME (link) != NULL_TREE)
11078 pop_binding (DECL_NAME (link), link);
11079 gcc_assert (TREE_CODE (link) != FUNCTION_DECL);
11080 DECL_CONTEXT (link) = NULL_TREE;
11083 poplevel (0, 0, 0);
11085 DECL_INITIAL (fndecl) = old_initial;
11087 /* We used to check if the context of FNDECL was different from
11088 current_class_type as another way to get inside here. This didn't work
11089 for String.cc in libg++. */
11090 if (DECL_FRIEND_P (fndecl))
11092 VEC_safe_push (tree, gc, CLASSTYPE_INLINE_FRIENDS (current_class_type),
11094 decl = void_type_node;
11101 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
11102 we can lay it out later, when and if its type becomes complete. */
11105 maybe_register_incomplete_var (tree var)
11107 gcc_assert (TREE_CODE (var) == VAR_DECL);
11109 /* Keep track of variables with incomplete types. */
11110 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
11111 && DECL_EXTERNAL (var))
11113 tree inner_type = TREE_TYPE (var);
11115 while (TREE_CODE (inner_type) == ARRAY_TYPE)
11116 inner_type = TREE_TYPE (inner_type);
11117 inner_type = TYPE_MAIN_VARIANT (inner_type);
11119 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
11120 /* RTTI TD entries are created while defining the type_info. */
11121 || (TYPE_LANG_SPECIFIC (inner_type)
11122 && TYPE_BEING_DEFINED (inner_type)))
11123 incomplete_vars = tree_cons (inner_type, var, incomplete_vars);
11127 /* Called when a class type (given by TYPE) is defined. If there are
11128 any existing VAR_DECLs whose type hsa been completed by this
11129 declaration, update them now. */
11132 complete_vars (tree type)
11134 tree *list = &incomplete_vars;
11136 gcc_assert (CLASS_TYPE_P (type));
11139 if (same_type_p (type, TREE_PURPOSE (*list)))
11141 tree var = TREE_VALUE (*list);
11142 tree type = TREE_TYPE (var);
11143 /* Complete the type of the variable. The VAR_DECL itself
11144 will be laid out in expand_expr. */
11145 complete_type (type);
11146 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
11147 /* Remove this entry from the list. */
11148 *list = TREE_CHAIN (*list);
11151 list = &TREE_CHAIN (*list);
11154 /* Check for pending declarations which may have abstract type. */
11155 complete_type_check_abstract (type);
11158 /* If DECL is of a type which needs a cleanup, build that cleanup
11162 cxx_maybe_build_cleanup (tree decl)
11164 tree type = TREE_TYPE (decl);
11166 if (type != error_mark_node && TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
11168 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
11170 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
11171 && CLASSTYPE_VBASECLASSES (type));
11173 if (TREE_CODE (type) == ARRAY_TYPE)
11177 cxx_mark_addressable (decl);
11178 rval = build_unary_op (ADDR_EXPR, decl, 0);
11181 /* Optimize for space over speed here. */
11182 if (!has_vbases || flag_expensive_optimizations)
11183 flags |= LOOKUP_NONVIRTUAL;
11185 rval = build_delete (TREE_TYPE (rval), rval,
11186 sfk_complete_destructor, flags, 0);
11193 /* When a stmt has been parsed, this function is called. */
11200 /* DECL was originally constructed as a non-static member function,
11201 but turned out to be static. Update it accordingly. */
11204 revert_static_member_fn (tree decl)
11207 tree function = TREE_TYPE (decl);
11208 tree args = TYPE_ARG_TYPES (function);
11210 if (cp_type_quals (TREE_TYPE (TREE_VALUE (args)))
11211 != TYPE_UNQUALIFIED)
11212 error ("static member function %q#D declared with type qualifiers", decl);
11214 args = TREE_CHAIN (args);
11215 tmp = build_function_type (TREE_TYPE (function), args);
11216 tmp = build_qualified_type (tmp, cp_type_quals (function));
11217 tmp = build_exception_variant (tmp,
11218 TYPE_RAISES_EXCEPTIONS (function));
11219 TREE_TYPE (decl) = tmp;
11220 if (DECL_ARGUMENTS (decl))
11221 DECL_ARGUMENTS (decl) = TREE_CHAIN (DECL_ARGUMENTS (decl));
11222 DECL_STATIC_FUNCTION_P (decl) = 1;
11225 /* Initialize the variables used during compilation of a C++
11229 cxx_push_function_context (struct function * f)
11231 struct language_function *p = GGC_CNEW (struct language_function);
11234 /* Whenever we start a new function, we destroy temporaries in the
11236 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
11242 if (DECL_SAVED_FUNCTION_DATA (fn))
11244 /* If we already parsed this function, and we're just expanding it
11245 now, restore saved state. */
11246 *cp_function_chain = *DECL_SAVED_FUNCTION_DATA (fn);
11248 /* We don't need the saved data anymore. Unless this is an inline
11249 function; we need the named return value info for
11250 declare_return_variable. */
11251 if (! DECL_INLINE (fn))
11252 DECL_SAVED_FUNCTION_DATA (fn) = NULL;
11257 /* Free the language-specific parts of F, now that we've finished
11258 compiling the function. */
11261 cxx_pop_function_context (struct function * f)
11266 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
11267 one of the language-independent trees. */
11269 enum cp_tree_node_structure_enum
11270 cp_tree_node_structure (union lang_tree_node * t)
11272 switch (TREE_CODE (&t->generic))
11274 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
11275 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
11276 case OVERLOAD: return TS_CP_OVERLOAD;
11277 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
11278 case TINST_LEVEL: return TS_CP_TINST_LEVEL;
11279 case PTRMEM_CST: return TS_CP_PTRMEM;
11280 case BASELINK: return TS_CP_BASELINK;
11281 default: return TS_CP_GENERIC;
11285 /* Build the void_list_node (void_type_node having been created). */
11287 build_void_list_node (void)
11289 tree t = build_tree_list (NULL_TREE, void_type_node);
11294 cp_missing_noreturn_ok_p (tree decl)
11296 /* A missing noreturn is ok for the `main' function. */
11297 return DECL_MAIN_P (decl);
11300 /* Return the COMDAT group into which DECL should be placed. */
11303 cxx_comdat_group (tree decl)
11307 /* Virtual tables, construction virtual tables, and virtual table
11308 tables all go in a single COMDAT group, named after the primary
11310 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
11311 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
11312 /* For all other DECLs, the COMDAT group is the mangled name of the
11313 declaration itself. */
11316 while (DECL_THUNK_P (decl))
11318 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
11319 into the same section as the target function. In that case
11320 we must return target's name. */
11321 tree target = THUNK_TARGET (decl);
11322 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
11323 && DECL_SECTION_NAME (target) != NULL
11324 && DECL_ONE_ONLY (target))
11329 name = DECL_ASSEMBLER_NAME (decl);
11332 return IDENTIFIER_POINTER (name);
11335 #include "gt-cp-decl.h"