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
1015 duplicate_decls (tree newdecl, tree olddecl)
1017 unsigned olddecl_uid = DECL_UID (olddecl);
1018 int olddecl_friend = 0, types_match = 0;
1019 int new_defines_function = 0;
1021 if (newdecl == olddecl)
1024 types_match = decls_match (newdecl, olddecl);
1026 /* If either the type of the new decl or the type of the old decl is an
1027 error_mark_node, then that implies that we have already issued an
1028 error (earlier) for some bogus type specification, and in that case,
1029 it is rather pointless to harass the user with yet more error message
1030 about the same declaration, so just pretend the types match here. */
1031 if (TREE_TYPE (newdecl) == error_mark_node
1032 || TREE_TYPE (olddecl) == error_mark_node)
1035 if (DECL_P (olddecl)
1036 && TREE_CODE (newdecl) == FUNCTION_DECL
1037 && TREE_CODE (olddecl) == FUNCTION_DECL
1038 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1040 if (DECL_DECLARED_INLINE_P (newdecl)
1041 && DECL_UNINLINABLE (newdecl)
1042 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1043 /* Already warned elsewhere. */;
1044 else if (DECL_DECLARED_INLINE_P (olddecl)
1045 && DECL_UNINLINABLE (olddecl)
1046 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1047 /* Already warned. */;
1048 else if (DECL_DECLARED_INLINE_P (newdecl)
1049 && DECL_UNINLINABLE (olddecl)
1050 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1052 warning (OPT_Wattributes, "function %q+D redeclared as inline",
1054 warning (OPT_Wattributes, "previous declaration of %q+D "
1055 "with attribute noinline", olddecl);
1057 else if (DECL_DECLARED_INLINE_P (olddecl)
1058 && DECL_UNINLINABLE (newdecl)
1059 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1061 warning (OPT_Wattributes, "function %q+D redeclared with "
1062 "attribute noinline", newdecl);
1063 warning (OPT_Wattributes, "previous declaration of %q+D was inline",
1068 /* Check for redeclaration and other discrepancies. */
1069 if (TREE_CODE (olddecl) == FUNCTION_DECL
1070 && DECL_ARTIFICIAL (olddecl))
1072 if (TREE_CODE (newdecl) != FUNCTION_DECL)
1074 /* Avoid warnings redeclaring anticipated built-ins. */
1075 if (DECL_ANTICIPATED (olddecl))
1078 /* If you declare a built-in or predefined function name as static,
1079 the old definition is overridden, but optionally warn this was a
1080 bad choice of name. */
1081 if (! TREE_PUBLIC (newdecl))
1084 warning (0, "shadowing %s function %q#D",
1085 DECL_BUILT_IN (olddecl) ? "built-in" : "library",
1087 /* Discard the old built-in function. */
1090 /* If the built-in is not ansi, then programs can override
1091 it even globally without an error. */
1092 else if (! DECL_BUILT_IN (olddecl))
1093 warning (0, "library function %q#D redeclared as non-function %q#D",
1097 error ("declaration of %q#D", newdecl);
1098 error ("conflicts with built-in declaration %q#D",
1103 else if (!types_match)
1105 /* Avoid warnings redeclaring anticipated built-ins. */
1106 if (DECL_ANTICIPATED (olddecl))
1108 /* Deal with fileptr_type_node. FILE type is not known
1109 at the time we create the builtins. */
1112 for (t1 = TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1113 t2 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1115 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1118 else if (TREE_VALUE (t2) == fileptr_type_node)
1120 tree t = TREE_VALUE (t1);
1122 if (TREE_CODE (t) == POINTER_TYPE
1123 && TYPE_NAME (TREE_TYPE (t))
1124 && DECL_NAME (TYPE_NAME (TREE_TYPE (t)))
1125 == get_identifier ("FILE")
1126 && compparms (TREE_CHAIN (t1), TREE_CHAIN (t2)))
1128 tree oldargs = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1130 TYPE_ARG_TYPES (TREE_TYPE (olddecl))
1131 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1132 types_match = decls_match (newdecl, olddecl);
1134 return duplicate_decls (newdecl, olddecl);
1135 TYPE_ARG_TYPES (TREE_TYPE (olddecl)) = oldargs;
1138 else if (! same_type_p (TREE_VALUE (t1), TREE_VALUE (t2)))
1141 else if ((DECL_EXTERN_C_P (newdecl)
1142 && DECL_EXTERN_C_P (olddecl))
1143 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1144 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1146 /* A near match; override the builtin. */
1148 if (TREE_PUBLIC (newdecl))
1150 warning (0, "new declaration %q#D", newdecl);
1151 warning (0, "ambiguates built-in declaration %q#D",
1154 else if (warn_shadow)
1155 warning (0, "shadowing %s function %q#D",
1156 DECL_BUILT_IN (olddecl) ? "built-in" : "library",
1160 /* Discard the old built-in function. */
1163 /* Replace the old RTL to avoid problems with inlining. */
1164 COPY_DECL_RTL (newdecl, olddecl);
1166 /* Even if the types match, prefer the new declarations type
1167 for anticipated built-ins, for exception lists, etc... */
1168 else if (DECL_ANTICIPATED (olddecl))
1170 tree type = TREE_TYPE (newdecl);
1171 tree attribs = (*targetm.merge_type_attributes)
1172 (TREE_TYPE (olddecl), type);
1174 type = cp_build_type_attribute_variant (type, attribs);
1175 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = type;
1178 /* Whether or not the builtin can throw exceptions has no
1179 bearing on this declarator. */
1180 TREE_NOTHROW (olddecl) = 0;
1182 if (DECL_THIS_STATIC (newdecl) && !DECL_THIS_STATIC (olddecl))
1184 /* If a builtin function is redeclared as `static', merge
1185 the declarations, but make the original one static. */
1186 DECL_THIS_STATIC (olddecl) = 1;
1187 TREE_PUBLIC (olddecl) = 0;
1189 /* Make the old declaration consistent with the new one so
1190 that all remnants of the builtin-ness of this function
1191 will be banished. */
1192 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1193 COPY_DECL_RTL (newdecl, olddecl);
1196 else if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1198 if ((TREE_CODE (olddecl) == TYPE_DECL && DECL_ARTIFICIAL (olddecl)
1199 && TREE_CODE (newdecl) != TYPE_DECL
1200 && ! (TREE_CODE (newdecl) == TEMPLATE_DECL
1201 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL))
1202 || (TREE_CODE (newdecl) == TYPE_DECL && DECL_ARTIFICIAL (newdecl)
1203 && TREE_CODE (olddecl) != TYPE_DECL
1204 && ! (TREE_CODE (olddecl) == TEMPLATE_DECL
1205 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
1208 /* We do nothing special here, because C++ does such nasty
1209 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1210 get shadowed, and know that if we need to find a TYPE_DECL
1211 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1212 slot of the identifier. */
1216 if ((TREE_CODE (newdecl) == FUNCTION_DECL
1217 && DECL_FUNCTION_TEMPLATE_P (olddecl))
1218 || (TREE_CODE (olddecl) == FUNCTION_DECL
1219 && DECL_FUNCTION_TEMPLATE_P (newdecl)))
1222 error ("%q#D redeclared as different kind of symbol", newdecl);
1223 if (TREE_CODE (olddecl) == TREE_LIST)
1224 olddecl = TREE_VALUE (olddecl);
1225 error ("previous declaration of %q+#D", olddecl);
1227 return error_mark_node;
1229 else if (!types_match)
1231 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
1232 /* These are certainly not duplicate declarations; they're
1233 from different scopes. */
1236 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1238 /* The name of a class template may not be declared to refer to
1239 any other template, class, function, object, namespace, value,
1240 or type in the same scope. */
1241 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == TYPE_DECL
1242 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1244 error ("declaration of template %q#D", newdecl);
1245 error ("conflicts with previous declaration %q+#D", olddecl);
1247 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == FUNCTION_DECL
1248 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == FUNCTION_DECL
1249 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl))),
1250 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl))))
1251 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1252 DECL_TEMPLATE_PARMS (olddecl))
1253 /* Template functions can be disambiguated by
1255 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl)),
1256 TREE_TYPE (TREE_TYPE (olddecl))))
1258 error ("new declaration %q#D", newdecl);
1259 error ("ambiguates old declaration %q+#D", olddecl);
1263 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1265 if (DECL_EXTERN_C_P (newdecl) && DECL_EXTERN_C_P (olddecl))
1267 error ("declaration of C function %q#D conflicts with",
1269 error ("previous declaration %q+#D here", olddecl);
1271 else if (compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1272 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1274 error ("new declaration %q#D", newdecl);
1275 error ("ambiguates old declaration %q+#D", olddecl);
1282 error ("conflicting declaration %q#D", newdecl);
1283 error ("%q+D has a previous declaration as %q#D", olddecl, olddecl);
1284 return error_mark_node;
1287 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1288 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1289 && (!DECL_TEMPLATE_INFO (newdecl)
1290 || (DECL_TI_TEMPLATE (newdecl)
1291 != DECL_TI_TEMPLATE (olddecl))))
1292 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1293 && (!DECL_TEMPLATE_INFO (olddecl)
1294 || (DECL_TI_TEMPLATE (olddecl)
1295 != DECL_TI_TEMPLATE (newdecl))))))
1296 /* It's OK to have a template specialization and a non-template
1297 with the same type, or to have specializations of two
1298 different templates with the same type. Note that if one is a
1299 specialization, and the other is an instantiation of the same
1300 template, that we do not exit at this point. That situation
1301 can occur if we instantiate a template class, and then
1302 specialize one of its methods. This situation is valid, but
1303 the declarations must be merged in the usual way. */
1305 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1306 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1307 && !DECL_USE_TEMPLATE (newdecl))
1308 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1309 && !DECL_USE_TEMPLATE (olddecl))))
1310 /* One of the declarations is a template instantiation, and the
1311 other is not a template at all. That's OK. */
1313 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1315 /* In [namespace.alias] we have:
1317 In a declarative region, a namespace-alias-definition can be
1318 used to redefine a namespace-alias declared in that declarative
1319 region to refer only to the namespace to which it already
1322 Therefore, if we encounter a second alias directive for the same
1323 alias, we can just ignore the second directive. */
1324 if (DECL_NAMESPACE_ALIAS (newdecl)
1325 && (DECL_NAMESPACE_ALIAS (newdecl)
1326 == DECL_NAMESPACE_ALIAS (olddecl)))
1328 /* [namespace.alias]
1330 A namespace-name or namespace-alias shall not be declared as
1331 the name of any other entity in the same declarative region.
1332 A namespace-name defined at global scope shall not be
1333 declared as the name of any other entity in any global scope
1335 error ("declaration of namespace %qD conflicts with", newdecl);
1336 error ("previous declaration of namespace %q+D here", olddecl);
1337 return error_mark_node;
1341 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1344 error (errmsg, newdecl);
1345 if (DECL_NAME (olddecl) != NULL_TREE)
1346 error ((DECL_INITIAL (olddecl) && namespace_bindings_p ())
1347 ? "%q+#D previously defined here"
1348 : "%q+#D previously declared here", olddecl);
1349 return error_mark_node;
1351 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1352 && DECL_INITIAL (olddecl) != NULL_TREE
1353 && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) == NULL_TREE
1354 && TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != NULL_TREE)
1356 /* Prototype decl follows defn w/o prototype. */
1357 warning (0, "prototype for %q+#D", newdecl);
1358 warning (0, "%Jfollows non-prototype definition here", olddecl);
1360 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1361 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1363 /* extern "C" int foo ();
1364 int foo () { bar (); }
1366 if (current_lang_depth () == 0)
1367 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1370 error ("previous declaration of %q+#D with %qL linkage",
1371 olddecl, DECL_LANGUAGE (olddecl));
1372 error ("conflicts with new declaration with %qL linkage",
1373 DECL_LANGUAGE (newdecl));
1377 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1379 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1381 tree t1 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1382 tree t2 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1385 if (TREE_CODE (TREE_TYPE (newdecl)) == METHOD_TYPE)
1386 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2);
1388 for (; t1 && t1 != void_list_node;
1389 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1390 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1392 if (1 == simple_cst_equal (TREE_PURPOSE (t1),
1395 pedwarn ("default argument given for parameter %d of %q#D",
1397 pedwarn ("after previous specification in %q+#D", olddecl);
1401 error ("default argument given for parameter %d of %q#D",
1403 error ("after previous specification in %q+#D",
1408 if (DECL_DECLARED_INLINE_P (newdecl)
1409 && ! DECL_DECLARED_INLINE_P (olddecl)
1410 && TREE_ADDRESSABLE (olddecl) && warn_inline)
1412 warning (0, "%q#D was used before it was declared inline", newdecl);
1413 warning (0, "%Jprevious non-inline declaration here", olddecl);
1418 /* Do not merge an implicit typedef with an explicit one. In:
1422 typedef class A A __attribute__ ((foo));
1424 the attribute should apply only to the typedef. */
1425 if (TREE_CODE (olddecl) == TYPE_DECL
1426 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1427 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1430 /* If new decl is `static' and an `extern' was seen previously,
1432 warn_extern_redeclared_static (newdecl, olddecl);
1434 /* We have committed to returning 1 at this point. */
1435 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1437 /* Now that functions must hold information normally held
1438 by field decls, there is extra work to do so that
1439 declaration information does not get destroyed during
1441 if (DECL_VINDEX (olddecl))
1442 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1443 if (DECL_CONTEXT (olddecl))
1444 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1445 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1446 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1447 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1448 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1449 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1450 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1451 SET_OVERLOADED_OPERATOR_CODE
1452 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1453 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1455 /* Optionally warn about more than one declaration for the same
1456 name, but don't warn about a function declaration followed by a
1458 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1459 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1460 /* Don't warn about extern decl followed by definition. */
1461 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1462 /* Don't warn about friends, let add_friend take care of it. */
1463 && ! (DECL_FRIEND_P (newdecl) || DECL_FRIEND_P (olddecl)))
1465 warning (0, "redundant redeclaration of %qD in same scope", newdecl);
1466 warning (0, "previous declaration of %q+D", olddecl);
1470 /* Deal with C++: must preserve virtual function table size. */
1471 if (TREE_CODE (olddecl) == TYPE_DECL)
1473 tree newtype = TREE_TYPE (newdecl);
1474 tree oldtype = TREE_TYPE (olddecl);
1476 if (newtype != error_mark_node && oldtype != error_mark_node
1477 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1478 CLASSTYPE_FRIEND_CLASSES (newtype)
1479 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1481 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1484 /* Copy all the DECL_... slots specified in the new decl
1485 except for any that we copy here from the old type. */
1486 DECL_ATTRIBUTES (newdecl)
1487 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1489 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1491 TREE_TYPE (olddecl) = TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl));
1492 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1493 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1494 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1496 /* If the new declaration is a definition, update the file and
1497 line information on the declaration. */
1498 if (DECL_INITIAL (DECL_TEMPLATE_RESULT (olddecl)) == NULL_TREE
1499 && DECL_INITIAL (DECL_TEMPLATE_RESULT (newdecl)) != NULL_TREE)
1501 DECL_SOURCE_LOCATION (olddecl)
1502 = DECL_SOURCE_LOCATION (DECL_TEMPLATE_RESULT (olddecl))
1503 = DECL_SOURCE_LOCATION (newdecl);
1504 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1505 DECL_ARGUMENTS (DECL_TEMPLATE_RESULT (olddecl))
1506 = DECL_ARGUMENTS (DECL_TEMPLATE_RESULT (newdecl));
1509 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1511 DECL_INLINE (DECL_TEMPLATE_RESULT (olddecl))
1512 |= DECL_INLINE (DECL_TEMPLATE_RESULT (newdecl));
1513 DECL_DECLARED_INLINE_P (DECL_TEMPLATE_RESULT (olddecl))
1514 |= DECL_DECLARED_INLINE_P (DECL_TEMPLATE_RESULT (newdecl));
1522 /* Automatically handles default parameters. */
1523 tree oldtype = TREE_TYPE (olddecl);
1526 /* Merge the data types specified in the two decls. */
1527 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1529 /* If merge_types produces a non-typedef type, just use the old type. */
1530 if (TREE_CODE (newdecl) == TYPE_DECL
1531 && newtype == DECL_ORIGINAL_TYPE (newdecl))
1534 if (TREE_CODE (newdecl) == VAR_DECL)
1536 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
1537 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
1538 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
1539 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
1542 /* Do this after calling `merge_types' so that default
1543 parameters don't confuse us. */
1544 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1545 && (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (newdecl))
1546 != TYPE_RAISES_EXCEPTIONS (TREE_TYPE (olddecl))))
1548 TREE_TYPE (newdecl) = build_exception_variant (newtype,
1549 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (newdecl)));
1550 TREE_TYPE (olddecl) = build_exception_variant (newtype,
1551 TYPE_RAISES_EXCEPTIONS (oldtype));
1553 if ((pedantic || ! DECL_IN_SYSTEM_HEADER (olddecl))
1554 && ! DECL_IS_BUILTIN (olddecl)
1556 && !comp_except_specs (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (newdecl)),
1557 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (olddecl)), 1))
1559 error ("declaration of %qF throws different exceptions",
1561 error ("than previous declaration %q+F", olddecl);
1564 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
1566 /* Lay the type out, unless already done. */
1567 if (! same_type_p (newtype, oldtype)
1568 && TREE_TYPE (newdecl) != error_mark_node
1569 && !(processing_template_decl && uses_template_parms (newdecl)))
1570 layout_type (TREE_TYPE (newdecl));
1572 if ((TREE_CODE (newdecl) == VAR_DECL
1573 || TREE_CODE (newdecl) == PARM_DECL
1574 || TREE_CODE (newdecl) == RESULT_DECL
1575 || TREE_CODE (newdecl) == FIELD_DECL
1576 || TREE_CODE (newdecl) == TYPE_DECL)
1577 && !(processing_template_decl && uses_template_parms (newdecl)))
1578 layout_decl (newdecl, 0);
1580 /* Merge the type qualifiers. */
1581 if (TREE_READONLY (newdecl))
1582 TREE_READONLY (olddecl) = 1;
1583 if (TREE_THIS_VOLATILE (newdecl))
1584 TREE_THIS_VOLATILE (olddecl) = 1;
1585 if (TREE_NOTHROW (newdecl))
1586 TREE_NOTHROW (olddecl) = 1;
1588 /* Merge deprecatedness. */
1589 if (TREE_DEPRECATED (newdecl))
1590 TREE_DEPRECATED (olddecl) = 1;
1592 /* Merge the initialization information. */
1593 if (DECL_INITIAL (newdecl) == NULL_TREE
1594 && DECL_INITIAL (olddecl) != NULL_TREE)
1596 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1597 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1598 if (CAN_HAVE_FULL_LANG_DECL_P (newdecl)
1599 && DECL_LANG_SPECIFIC (newdecl)
1600 && DECL_LANG_SPECIFIC (olddecl))
1602 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1603 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1607 /* Merge the section attribute.
1608 We want to issue an error if the sections conflict but that must be
1609 done later in decl_attributes since we are called before attributes
1611 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1612 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1614 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1616 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1617 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1618 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1619 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1620 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1621 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
1622 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1623 DECL_IS_PURE (newdecl) |= DECL_IS_PURE (olddecl);
1624 /* Keep the old RTL. */
1625 COPY_DECL_RTL (olddecl, newdecl);
1627 else if (TREE_CODE (newdecl) == VAR_DECL
1628 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
1630 /* Keep the old RTL. We cannot keep the old RTL if the old
1631 declaration was for an incomplete object and the new
1632 declaration is not since many attributes of the RTL will
1634 COPY_DECL_RTL (olddecl, newdecl);
1637 /* If cannot merge, then use the new type and qualifiers,
1638 and don't preserve the old rtl. */
1641 /* Clean out any memory we had of the old declaration. */
1642 tree oldstatic = value_member (olddecl, static_aggregates);
1644 TREE_VALUE (oldstatic) = error_mark_node;
1646 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1647 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1648 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1649 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1652 /* Merge the storage class information. */
1653 merge_weak (newdecl, olddecl);
1655 DECL_ONE_ONLY (newdecl) |= DECL_ONE_ONLY (olddecl);
1656 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
1657 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1658 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
1659 if (! DECL_EXTERNAL (olddecl))
1660 DECL_EXTERNAL (newdecl) = 0;
1662 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
1664 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
1665 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
1666 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
1667 DECL_TEMPLATE_INSTANTIATED (newdecl)
1668 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
1670 /* If the OLDDECL is an instantiation and/or specialization,
1671 then the NEWDECL must be too. But, it may not yet be marked
1672 as such if the caller has created NEWDECL, but has not yet
1673 figured out that it is a redeclaration. */
1674 if (!DECL_USE_TEMPLATE (newdecl))
1675 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
1677 /* Don't really know how much of the language-specific
1678 values we should copy from old to new. */
1679 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
1680 DECL_LANG_SPECIFIC (newdecl)->decl_flags.u2 =
1681 DECL_LANG_SPECIFIC (olddecl)->decl_flags.u2;
1682 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
1683 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
1684 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
1685 DECL_INITIALIZED_IN_CLASS_P (newdecl)
1686 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
1687 olddecl_friend = DECL_FRIEND_P (olddecl);
1689 /* Only functions have DECL_BEFRIENDING_CLASSES. */
1690 if (TREE_CODE (newdecl) == FUNCTION_DECL
1691 || DECL_FUNCTION_TEMPLATE_P (newdecl))
1693 DECL_BEFRIENDING_CLASSES (newdecl)
1694 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
1695 DECL_BEFRIENDING_CLASSES (olddecl));
1696 /* DECL_THUNKS is only valid for virtual functions,
1697 otherwise it is a DECL_FRIEND_CONTEXT. */
1698 if (DECL_VIRTUAL_P (newdecl))
1699 DECL_THUNKS (newdecl) = DECL_THUNKS (olddecl);
1703 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1705 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
1706 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
1708 /* If newdecl is not a specialization, then it is not a
1709 template-related function at all. And that means that we
1710 should have exited above, returning 0. */
1711 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
1713 if (TREE_USED (olddecl))
1714 /* From [temp.expl.spec]:
1716 If a template, a member template or the member of a class
1717 template is explicitly specialized then that
1718 specialization shall be declared before the first use of
1719 that specialization that would cause an implicit
1720 instantiation to take place, in every translation unit in
1721 which such a use occurs. */
1722 error ("explicit specialization of %qD after first use",
1725 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
1727 /* [temp.expl.spec/14] We don't inline explicit specialization
1728 just because the primary template says so. */
1732 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
1733 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
1735 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
1737 /* If either decl says `inline', this fn is inline, unless
1738 its definition was passed already. */
1739 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == NULL_TREE)
1740 DECL_INLINE (olddecl) = 1;
1741 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1743 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1744 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1747 /* Preserve abstractness on cloned [cd]tors. */
1748 DECL_ABSTRACT (newdecl) = DECL_ABSTRACT (olddecl);
1752 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1753 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
1754 COPY_DECL_RTL (newdecl, olddecl);
1756 if (! types_match || new_defines_function)
1758 /* These need to be copied so that the names are available.
1759 Note that if the types do match, we'll preserve inline
1760 info and other bits, but if not, we won't. */
1761 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
1762 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
1764 if (new_defines_function)
1765 /* If defining a function declared with other language
1766 linkage, use the previously declared language linkage. */
1767 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1768 else if (types_match)
1770 /* If redeclaring a builtin function, and not a definition,
1771 it stays built in. */
1772 if (DECL_BUILT_IN (olddecl))
1774 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1775 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1776 /* If we're keeping the built-in definition, keep the rtl,
1777 regardless of declaration matches. */
1778 COPY_DECL_RTL (olddecl, newdecl);
1781 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1782 /* Don't clear out the arguments if we're redefining a function. */
1783 if (DECL_ARGUMENTS (olddecl))
1784 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1787 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1788 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
1790 /* Now preserve various other info from the definition. */
1791 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
1792 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
1793 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
1794 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1796 /* Warn about conflicting visibility specifications. */
1797 if (DECL_VISIBILITY_SPECIFIED (olddecl)
1798 && DECL_VISIBILITY_SPECIFIED (newdecl)
1799 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
1801 warning (OPT_Wattributes, "%q+D: visibility attribute ignored "
1802 "because it", newdecl);
1803 warning (OPT_Wattributes, "%Jconflicts with previous "
1804 "declaration here", olddecl);
1806 /* Choose the declaration which specified visibility. */
1807 if (DECL_VISIBILITY_SPECIFIED (olddecl))
1809 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
1810 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
1812 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
1813 so keep this behavior. */
1814 if (TREE_CODE (newdecl) == VAR_DECL && DECL_HAS_INIT_PRIORITY_P (newdecl))
1816 SET_DECL_INIT_PRIORITY (olddecl, DECL_INIT_PRIORITY (newdecl));
1817 DECL_HAS_INIT_PRIORITY_P (olddecl) = 1;
1820 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
1821 with that from NEWDECL below. */
1822 if (DECL_LANG_SPECIFIC (olddecl))
1824 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
1825 != DECL_LANG_SPECIFIC (newdecl));
1826 ggc_free (DECL_LANG_SPECIFIC (olddecl));
1829 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1833 function_size = sizeof (struct tree_decl_common);
1835 memcpy ((char *) olddecl + sizeof (struct tree_common),
1836 (char *) newdecl + sizeof (struct tree_common),
1837 function_size - sizeof (struct tree_common));
1839 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
1840 (char *) newdecl + sizeof (struct tree_decl_common),
1841 sizeof (struct tree_function_decl) - sizeof (struct tree_decl_common));
1842 if (DECL_TEMPLATE_INFO (newdecl))
1843 /* If newdecl is a template instantiation, it is possible that
1844 the following sequence of events has occurred:
1846 o A friend function was declared in a class template. The
1847 class template was instantiated.
1849 o The instantiation of the friend declaration was
1850 recorded on the instantiation list, and is newdecl.
1852 o Later, however, instantiate_class_template called pushdecl
1853 on the newdecl to perform name injection. But, pushdecl in
1854 turn called duplicate_decls when it discovered that another
1855 declaration of a global function with the same name already
1858 o Here, in duplicate_decls, we decided to clobber newdecl.
1860 If we're going to do that, we'd better make sure that
1861 olddecl, and not newdecl, is on the list of
1862 instantiations so that if we try to do the instantiation
1863 again we won't get the clobbered declaration. */
1864 reregister_specialization (newdecl,
1865 DECL_TI_TEMPLATE (newdecl),
1870 size_t size = tree_code_size (TREE_CODE (olddecl));
1871 memcpy ((char *) olddecl + sizeof (struct tree_common),
1872 (char *) newdecl + sizeof (struct tree_common),
1873 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
1874 switch (TREE_CODE (olddecl))
1884 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
1885 (char *) newdecl + sizeof (struct tree_decl_common),
1886 size - sizeof (struct tree_decl_common)
1887 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
1891 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
1892 (char *) newdecl + sizeof (struct tree_decl_common),
1893 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)
1894 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
1898 DECL_UID (olddecl) = olddecl_uid;
1900 DECL_FRIEND_P (olddecl) = 1;
1902 /* NEWDECL contains the merged attribute lists.
1903 Update OLDDECL to be the same. */
1904 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
1906 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
1907 so that encode_section_info has a chance to look at the new decl
1908 flags and attributes. */
1909 if (DECL_RTL_SET_P (olddecl)
1910 && (TREE_CODE (olddecl) == FUNCTION_DECL
1911 || (TREE_CODE (olddecl) == VAR_DECL
1912 && TREE_STATIC (olddecl))))
1913 make_decl_rtl (olddecl);
1915 /* The NEWDECL will no longer be needed. Because every out-of-class
1916 declaration of a member results in a call to duplicate_decls,
1917 freeing these nodes represents in a significant savings. */
1923 /* Return zero if the declaration NEWDECL is valid
1924 when the declaration OLDDECL (assumed to be for the same name)
1925 has already been seen.
1926 Otherwise return an error message format string with a %s
1927 where the identifier should go. */
1930 redeclaration_error_message (tree newdecl, tree olddecl)
1932 if (TREE_CODE (newdecl) == TYPE_DECL)
1934 /* Because C++ can put things into name space for free,
1935 constructs like "typedef struct foo { ... } foo"
1936 would look like an erroneous redeclaration. */
1937 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
1940 return "redefinition of %q#D";
1942 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1944 /* If this is a pure function, its olddecl will actually be
1945 the original initialization to `0' (which we force to call
1946 abort()). Don't complain about redefinition in this case. */
1947 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
1948 && DECL_INITIAL (olddecl) == NULL_TREE)
1951 /* If both functions come from different namespaces, this is not
1952 a redeclaration - this is a conflict with a used function. */
1953 if (DECL_NAMESPACE_SCOPE_P (olddecl)
1954 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
1955 && ! decls_match (olddecl, newdecl))
1956 return "%qD conflicts with used function";
1958 /* We'll complain about linkage mismatches in
1959 warn_extern_redeclared_static. */
1961 /* Defining the same name twice is no good. */
1962 if (DECL_INITIAL (olddecl) != NULL_TREE
1963 && DECL_INITIAL (newdecl) != NULL_TREE)
1965 if (DECL_NAME (olddecl) == NULL_TREE)
1966 return "%q#D not declared in class";
1968 return "redefinition of %q#D";
1972 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1976 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1978 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
1979 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
1980 return "redefinition of %q#D";
1984 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
1985 || (DECL_TEMPLATE_RESULT (newdecl)
1986 == DECL_TEMPLATE_RESULT (olddecl)))
1989 nt = DECL_TEMPLATE_RESULT (newdecl);
1990 if (DECL_TEMPLATE_INFO (nt))
1991 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
1992 ot = DECL_TEMPLATE_RESULT (olddecl);
1993 if (DECL_TEMPLATE_INFO (ot))
1994 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
1995 if (DECL_INITIAL (nt) && DECL_INITIAL (ot))
1996 return "redefinition of %q#D";
2000 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2002 /* Objects declared at top level: */
2003 /* If at least one is a reference, it's ok. */
2004 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2006 /* Reject two definitions. */
2007 return "redefinition of %q#D";
2011 /* Objects declared with block scope: */
2012 /* Reject two definitions, and reject a definition
2013 together with an external reference. */
2014 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2015 return "redeclaration of %q#D";
2020 /* Create a new label, named ID. */
2023 make_label_decl (tree id, int local_p)
2027 decl = build_decl (LABEL_DECL, id, void_type_node);
2029 DECL_CONTEXT (decl) = current_function_decl;
2030 DECL_MODE (decl) = VOIDmode;
2031 C_DECLARED_LABEL_FLAG (decl) = local_p;
2033 /* Say where one reference is to the label, for the sake of the
2034 error if it is not defined. */
2035 DECL_SOURCE_LOCATION (decl) = input_location;
2037 /* Record the fact that this identifier is bound to this label. */
2038 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2043 /* Record this label on the list of used labels so that we can check
2044 at the end of the function to see whether or not the label was
2045 actually defined, and so we can check when the label is defined whether
2046 this use is valid. */
2049 use_label (tree decl)
2051 if (named_label_uses == NULL
2052 || named_label_uses->names_in_scope != current_binding_level->names
2053 || named_label_uses->label_decl != decl)
2055 struct named_label_use_list *new_ent;
2056 new_ent = GGC_NEW (struct named_label_use_list);
2057 new_ent->label_decl = decl;
2058 new_ent->names_in_scope = current_binding_level->names;
2059 new_ent->binding_level = current_binding_level;
2060 new_ent->o_goto_locus = input_location;
2061 new_ent->next = named_label_uses;
2062 named_label_uses = new_ent;
2066 /* Look for a label named ID in the current function. If one cannot
2067 be found, create one. (We keep track of used, but undefined,
2068 labels, and complain about them at the end of a function.) */
2071 lookup_label (tree id)
2074 struct named_label_list *ent;
2076 timevar_push (TV_NAME_LOOKUP);
2077 /* You can't use labels at global scope. */
2078 if (current_function_decl == NULL_TREE)
2080 error ("label %qE referenced outside of any function", id);
2081 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, NULL_TREE);
2084 /* See if we've already got this label. */
2085 decl = IDENTIFIER_LABEL_VALUE (id);
2086 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2087 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2089 /* Record this label on the list of labels used in this function.
2090 We do this before calling make_label_decl so that we get the
2091 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2092 ent = GGC_CNEW (struct named_label_list);
2093 ent->old_value = IDENTIFIER_LABEL_VALUE (id);
2094 ent->next = named_labels;
2097 /* We need a new label. */
2098 decl = make_label_decl (id, /*local_p=*/0);
2100 /* Now fill in the information we didn't have before. */
2101 ent->label_decl = decl;
2103 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2106 /* Declare a local label named ID. */
2109 declare_local_label (tree id)
2113 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2114 this scope we can restore the old value of
2115 IDENTIFIER_TYPE_VALUE. */
2116 current_binding_level->shadowed_labels
2117 = tree_cons (IDENTIFIER_LABEL_VALUE (id), NULL_TREE,
2118 current_binding_level->shadowed_labels);
2119 /* Look for the label. */
2120 decl = make_label_decl (id, /*local_p=*/1);
2121 /* Now fill in the information we didn't have before. */
2122 TREE_VALUE (current_binding_level->shadowed_labels) = decl;
2127 /* Returns nonzero if it is ill-formed to jump past the declaration of
2128 DECL. Returns 2 if it's also a real problem. */
2131 decl_jump_unsafe (tree decl)
2133 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl))
2136 if (DECL_INITIAL (decl) == NULL_TREE
2137 && pod_type_p (TREE_TYPE (decl)))
2140 /* This is really only important if we're crossing an initialization.
2141 The POD stuff is just pedantry; why should it matter if the class
2142 contains a field of pointer to member type? */
2143 if (DECL_INITIAL (decl)
2144 || (TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))))
2149 /* Check that a single previously seen jump to a newly defined label
2150 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2151 the jump context; NAMES are the names in scope in LEVEL at the jump
2152 context; FILE and LINE are the source position of the jump or 0. */
2155 check_previous_goto_1 (tree decl,
2156 struct cp_binding_level* level,
2157 tree names, const location_t *locus)
2161 struct cp_binding_level *b = current_binding_level;
2162 for (; b; b = b->level_chain)
2164 tree new_decls = b->names;
2165 tree old_decls = (b == level ? names : NULL_TREE);
2166 for (; new_decls != old_decls;
2167 new_decls = TREE_CHAIN (new_decls))
2169 int problem = decl_jump_unsafe (new_decls);
2176 pedwarn ("jump to label %qD", decl);
2178 pedwarn ("jump to case label");
2181 pedwarn ("%H from here", locus);
2186 error (" crosses initialization of %q+#D", new_decls);
2188 pedwarn (" enters scope of non-POD %q+#D", new_decls);
2193 if ((b->kind == sk_try || b->kind == sk_catch) && ! saw_eh)
2198 pedwarn ("jump to label %qD", decl);
2200 pedwarn ("jump to case label");
2203 pedwarn ("%H from here", locus);
2206 if (b->kind == sk_try)
2207 error (" enters try block");
2209 error (" enters catch block");
2216 check_previous_goto (struct named_label_use_list* use)
2218 check_previous_goto_1 (use->label_decl, use->binding_level,
2219 use->names_in_scope, &use->o_goto_locus);
2223 check_switch_goto (struct cp_binding_level* level)
2225 check_previous_goto_1 (NULL_TREE, level, level->names, NULL);
2228 /* Check that any previously seen jumps to a newly defined label DECL
2229 are OK. Called by define_label. */
2232 check_previous_gotos (tree decl)
2234 struct named_label_use_list **usep;
2236 if (! TREE_USED (decl))
2239 for (usep = &named_label_uses; *usep; )
2241 struct named_label_use_list *use = *usep;
2242 if (use->label_decl == decl)
2244 check_previous_goto (use);
2248 usep = &(use->next);
2252 /* Check that a new jump to a label DECL is OK. Called by
2253 finish_goto_stmt. */
2256 check_goto (tree decl)
2260 struct named_label_list *lab;
2262 /* We can't know where a computed goto is jumping. So we assume
2264 if (! DECL_P (decl))
2267 /* If the label hasn't been defined yet, defer checking. */
2268 if (! DECL_INITIAL (decl))
2274 for (lab = named_labels; lab; lab = lab->next)
2275 if (decl == lab->label_decl)
2278 /* If the label is not on named_labels it's a gcc local label, so
2279 it must be in an outer scope, so jumping to it is always OK. */
2283 if ((lab->in_try_scope || lab->in_catch_scope || lab->bad_decls)
2286 pedwarn ("jump to label %q+D", decl);
2287 pedwarn (" from here");
2291 for (bad = lab->bad_decls; bad; bad = TREE_CHAIN (bad))
2293 tree b = TREE_VALUE (bad);
2294 int u = decl_jump_unsafe (b);
2296 if (u > 1 && DECL_ARTIFICIAL (b))
2297 /* Can't skip init of __exception_info. */
2298 error ("%J enters catch block", b);
2300 error (" skips initialization of %q+#D", b);
2302 pedwarn (" enters scope of non-POD %q+#D", b);
2305 if (lab->in_try_scope)
2306 error (" enters try block");
2307 else if (lab->in_catch_scope)
2308 error (" enters catch block");
2311 /* Define a label, specifying the location in the source file.
2312 Return the LABEL_DECL node for the label. */
2315 define_label (location_t location, tree name)
2317 tree decl = lookup_label (name);
2318 struct named_label_list *ent;
2319 struct cp_binding_level *p;
2321 timevar_push (TV_NAME_LOOKUP);
2322 for (ent = named_labels; ent; ent = ent->next)
2323 if (ent->label_decl == decl)
2326 /* After labels, make any new cleanups in the function go into their
2327 own new (temporary) binding contour. */
2328 for (p = current_binding_level;
2329 p->kind != sk_function_parms;
2331 p->more_cleanups_ok = 0;
2333 if (name == get_identifier ("wchar_t"))
2334 pedwarn ("label named wchar_t");
2336 if (DECL_INITIAL (decl) != NULL_TREE)
2337 error ("duplicate label %qD", decl);
2340 /* Mark label as having been defined. */
2341 DECL_INITIAL (decl) = error_mark_node;
2342 /* Say where in the source. */
2343 DECL_SOURCE_LOCATION (decl) = location;
2346 ent->names_in_scope = current_binding_level->names;
2347 ent->binding_level = current_binding_level;
2349 check_previous_gotos (decl);
2352 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2357 struct cp_binding_level *level;
2358 struct cp_switch *next;
2359 /* The SWITCH_STMT being built. */
2361 /* A splay-tree mapping the low element of a case range to the high
2362 element, or NULL_TREE if there is no high element. Used to
2363 determine whether or not a new case label duplicates an old case
2364 label. We need a tree, rather than simply a hash table, because
2365 of the GNU case range extension. */
2369 /* A stack of the currently active switch statements. The innermost
2370 switch statement is on the top of the stack. There is no need to
2371 mark the stack for garbage collection because it is only active
2372 during the processing of the body of a function, and we never
2373 collect at that point. */
2375 static struct cp_switch *switch_stack;
2377 /* Called right after a switch-statement condition is parsed.
2378 SWITCH_STMT is the switch statement being parsed. */
2381 push_switch (tree switch_stmt)
2383 struct cp_switch *p = xmalloc (sizeof (struct cp_switch));
2384 p->level = current_binding_level;
2385 p->next = switch_stack;
2386 p->switch_stmt = switch_stmt;
2387 p->cases = splay_tree_new (case_compare, NULL, NULL);
2394 struct cp_switch *cs = switch_stack;
2395 location_t switch_location;
2397 /* Emit warnings as needed. */
2398 if (EXPR_HAS_LOCATION (cs->switch_stmt))
2399 switch_location = EXPR_LOCATION (cs->switch_stmt);
2401 switch_location = input_location;
2402 c_do_switch_warnings (cs->cases, switch_location,
2403 SWITCH_STMT_TYPE (cs->switch_stmt),
2404 SWITCH_STMT_COND (cs->switch_stmt));
2406 splay_tree_delete (cs->cases);
2407 switch_stack = switch_stack->next;
2411 /* Note that we've seen a definition of a case label, and complain if this
2412 is a bad place for one. */
2415 finish_case_label (tree low_value, tree high_value)
2418 struct cp_binding_level *p;
2420 if (processing_template_decl)
2424 /* For templates, just add the case label; we'll do semantic
2425 analysis at instantiation-time. */
2426 label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
2427 return add_stmt (build_case_label (low_value, high_value, label));
2430 /* Find the condition on which this switch statement depends. */
2431 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
2432 if (cond && TREE_CODE (cond) == TREE_LIST)
2433 cond = TREE_VALUE (cond);
2435 r = c_add_case_label (switch_stack->cases, cond, TREE_TYPE (cond),
2436 low_value, high_value);
2438 check_switch_goto (switch_stack->level);
2440 /* After labels, make any new cleanups in the function go into their
2441 own new (temporary) binding contour. */
2442 for (p = current_binding_level;
2443 p->kind != sk_function_parms;
2445 p->more_cleanups_ok = 0;
2450 /* Hash a TYPENAME_TYPE. K is really of type `tree'. */
2453 typename_hash (const void* k)
2458 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
2459 ^ htab_hash_pointer (DECL_NAME (TYPE_NAME (t))));
2464 typedef struct typename_info {
2472 /* Compare two TYPENAME_TYPEs. K1 and K2 are really of type `tree'. */
2475 typename_compare (const void * k1, const void * k2)
2478 const typename_info *t2;
2481 t2 = (const typename_info *) k2;
2483 return (DECL_NAME (TYPE_NAME (t1)) == t2->name
2484 && TYPE_CONTEXT (t1) == t2->scope
2485 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
2486 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
2487 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
2490 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
2491 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
2493 Returns the new TYPENAME_TYPE. */
2495 static GTY ((param_is (union tree_node))) htab_t typename_htab;
2498 build_typename_type (tree context, tree name, tree fullname,
2499 enum tag_types tag_type)
2507 if (typename_htab == NULL)
2508 typename_htab = htab_create_ggc (61, &typename_hash,
2509 &typename_compare, NULL);
2511 ti.scope = FROB_CONTEXT (context);
2513 ti.template_id = fullname;
2514 ti.enum_p = tag_type == enum_type;
2515 ti.class_p = (tag_type == class_type
2516 || tag_type == record_type
2517 || tag_type == union_type);
2518 hash = (htab_hash_pointer (ti.scope)
2519 ^ htab_hash_pointer (ti.name));
2521 /* See if we already have this type. */
2522 e = htab_find_slot_with_hash (typename_htab, &ti, hash, INSERT);
2527 /* Build the TYPENAME_TYPE. */
2528 t = make_aggr_type (TYPENAME_TYPE);
2529 TYPE_CONTEXT (t) = ti.scope;
2530 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
2531 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
2532 TYPENAME_IS_CLASS_P (t) = ti.class_p;
2534 /* Build the corresponding TYPE_DECL. */
2535 d = build_decl (TYPE_DECL, name, t);
2536 TYPE_NAME (TREE_TYPE (d)) = d;
2537 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
2538 DECL_CONTEXT (d) = FROB_CONTEXT (context);
2539 DECL_ARTIFICIAL (d) = 1;
2541 /* Store it in the hash table. */
2548 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
2549 provided to name the type. Returns an appropriate type, unless an
2550 error occurs, in which case error_mark_node is returned. If we
2551 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
2552 return that, rather than the _TYPE it corresponds to, in other
2553 cases we look through the type decl. If TF_ERROR is set, complain
2554 about errors, otherwise be quiet. */
2557 make_typename_type (tree context, tree name, enum tag_types tag_type,
2558 tsubst_flags_t complain)
2562 if (name == error_mark_node
2563 || context == NULL_TREE
2564 || context == error_mark_node)
2565 return error_mark_node;
2569 if (!(TYPE_LANG_SPECIFIC (name)
2570 && (CLASSTYPE_IS_TEMPLATE (name)
2571 || CLASSTYPE_USE_TEMPLATE (name))))
2572 name = TYPE_IDENTIFIER (name);
2574 /* Create a TEMPLATE_ID_EXPR for the type. */
2575 name = build_nt (TEMPLATE_ID_EXPR,
2576 CLASSTYPE_TI_TEMPLATE (name),
2577 CLASSTYPE_TI_ARGS (name));
2579 else if (TREE_CODE (name) == TYPE_DECL)
2580 name = DECL_NAME (name);
2584 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
2586 name = TREE_OPERAND (name, 0);
2587 if (TREE_CODE (name) == TEMPLATE_DECL)
2588 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
2590 if (TREE_CODE (name) == TEMPLATE_DECL)
2592 error ("%qD used without template parameters", name);
2593 return error_mark_node;
2595 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
2596 gcc_assert (TYPE_P (context));
2598 if (!dependent_type_p (context)
2599 || currently_open_class (context))
2601 if (TREE_CODE (fullname) == TEMPLATE_ID_EXPR)
2603 tree tmpl = NULL_TREE;
2604 if (IS_AGGR_TYPE (context))
2605 tmpl = lookup_field (context, name, 0, false);
2606 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
2608 if (complain & tf_error)
2609 error ("no class template named %q#T in %q#T",
2611 return error_mark_node;
2614 if (complain & tf_error)
2615 perform_or_defer_access_check (TYPE_BINFO (context), tmpl);
2617 return lookup_template_class (tmpl,
2618 TREE_OPERAND (fullname, 1),
2620 /*entering_scope=*/0,
2621 tf_error | tf_warning | tf_user);
2627 if (!IS_AGGR_TYPE (context))
2629 if (complain & tf_error)
2630 error ("no type named %q#T in %q#T", name, context);
2631 return error_mark_node;
2634 t = lookup_field (context, name, 0, true);
2637 if (TREE_CODE (t) != TYPE_DECL)
2639 if (complain & tf_error)
2640 error ("no type named %q#T in %q#T", name, context);
2641 return error_mark_node;
2644 if (complain & tf_error)
2645 perform_or_defer_access_check (TYPE_BINFO (context), t);
2647 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
2655 /* If the CONTEXT is not a template type, then either the field is
2656 there now or its never going to be. */
2657 if (!dependent_type_p (context))
2659 if (complain & tf_error)
2660 error ("no type named %q#T in %q#T", name, context);
2661 return error_mark_node;
2664 return build_typename_type (context, name, fullname, tag_type);
2667 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
2668 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
2669 in which case error_mark_node is returned.
2671 If PARM_LIST is non-NULL, also make sure that the template parameter
2672 list of TEMPLATE_DECL matches.
2674 If COMPLAIN zero, don't complain about any errors that occur. */
2677 make_unbound_class_template (tree context, tree name, tree parm_list,
2678 tsubst_flags_t complain)
2684 name = TYPE_IDENTIFIER (name);
2685 else if (DECL_P (name))
2686 name = DECL_NAME (name);
2687 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
2689 if (!dependent_type_p (context)
2690 || currently_open_class (context))
2692 tree tmpl = NULL_TREE;
2694 if (IS_AGGR_TYPE (context))
2695 tmpl = lookup_field (context, name, 0, false);
2697 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
2699 if (complain & tf_error)
2700 error ("no class template named %q#T in %q#T", name, context);
2701 return error_mark_node;
2705 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
2707 if (complain & tf_error)
2709 error ("template parameters do not match template");
2710 error ("%q+D declared here", tmpl);
2712 return error_mark_node;
2715 if (complain & tf_error)
2716 perform_or_defer_access_check (TYPE_BINFO (context), tmpl);
2721 /* Build the UNBOUND_CLASS_TEMPLATE. */
2722 t = make_aggr_type (UNBOUND_CLASS_TEMPLATE);
2723 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
2724 TREE_TYPE (t) = NULL_TREE;
2726 /* Build the corresponding TEMPLATE_DECL. */
2727 d = build_decl (TEMPLATE_DECL, name, t);
2728 TYPE_NAME (TREE_TYPE (d)) = d;
2729 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
2730 DECL_CONTEXT (d) = FROB_CONTEXT (context);
2731 DECL_ARTIFICIAL (d) = 1;
2732 DECL_TEMPLATE_PARMS (d) = parm_list;
2739 /* Push the declarations of builtin types into the namespace.
2740 RID_INDEX is the index of the builtin type in the array
2741 RID_POINTERS. NAME is the name used when looking up the builtin
2742 type. TYPE is the _TYPE node for the builtin type. */
2745 record_builtin_type (enum rid rid_index,
2749 tree rname = NULL_TREE, tname = NULL_TREE;
2750 tree tdecl = NULL_TREE;
2752 if ((int) rid_index < (int) RID_MAX)
2753 rname = ridpointers[(int) rid_index];
2755 tname = get_identifier (name);
2757 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
2758 eliminated. Built-in types should not be looked up name; their
2759 names are keywords that the parser can recognize. However, there
2760 is code in c-common.c that uses identifier_global_value to look
2761 up built-in types by name. */
2764 tdecl = build_decl (TYPE_DECL, tname, type);
2765 DECL_ARTIFICIAL (tdecl) = 1;
2766 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
2772 tdecl = build_decl (TYPE_DECL, rname, type);
2773 DECL_ARTIFICIAL (tdecl) = 1;
2775 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
2778 if (!TYPE_NAME (type))
2779 TYPE_NAME (type) = tdecl;
2782 debug_hooks->type_decl (tdecl, 0);
2785 /* Record one of the standard Java types.
2786 * Declare it as having the given NAME.
2787 * If SIZE > 0, it is the size of one of the integral types;
2788 * otherwise it is the negative of the size of one of the other types. */
2791 record_builtin_java_type (const char* name, int size)
2795 type = make_signed_type (size);
2796 else if (size > -32)
2797 { /* "__java_char" or ""__java_boolean". */
2798 type = make_unsigned_type (-size);
2799 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
2802 { /* "__java_float" or ""__java_double". */
2803 type = make_node (REAL_TYPE);
2804 TYPE_PRECISION (type) = - size;
2807 record_builtin_type (RID_MAX, name, type);
2808 decl = TYPE_NAME (type);
2810 /* Suppress generate debug symbol entries for these types,
2811 since for normal C++ they are just clutter.
2812 However, push_lang_context undoes this if extern "Java" is seen. */
2813 DECL_IGNORED_P (decl) = 1;
2815 TYPE_FOR_JAVA (type) = 1;
2819 /* Push a type into the namespace so that the back-ends ignore it. */
2822 record_unknown_type (tree type, const char* name)
2824 tree decl = pushdecl (build_decl (TYPE_DECL, get_identifier (name), type));
2825 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
2826 DECL_IGNORED_P (decl) = 1;
2827 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
2828 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
2829 TYPE_ALIGN (type) = 1;
2830 TYPE_USER_ALIGN (type) = 0;
2831 TYPE_MODE (type) = TYPE_MODE (void_type_node);
2834 /* A string for which we should create an IDENTIFIER_NODE at
2837 typedef struct predefined_identifier
2839 /* The name of the identifier. */
2840 const char *const name;
2841 /* The place where the IDENTIFIER_NODE should be stored. */
2843 /* Nonzero if this is the name of a constructor or destructor. */
2844 const int ctor_or_dtor_p;
2845 } predefined_identifier;
2847 /* Create all the predefined identifiers. */
2850 initialize_predefined_identifiers (void)
2852 const predefined_identifier *pid;
2854 /* A table of identifiers to create at startup. */
2855 static const predefined_identifier predefined_identifiers[] = {
2856 { "C++", &lang_name_cplusplus, 0 },
2857 { "C", &lang_name_c, 0 },
2858 { "Java", &lang_name_java, 0 },
2859 /* Some of these names have a trailing space so that it is
2860 impossible for them to conflict with names written by users. */
2861 { "__ct ", &ctor_identifier, 1 },
2862 { "__base_ctor ", &base_ctor_identifier, 1 },
2863 { "__comp_ctor ", &complete_ctor_identifier, 1 },
2864 { "__dt ", &dtor_identifier, 1 },
2865 { "__comp_dtor ", &complete_dtor_identifier, 1 },
2866 { "__base_dtor ", &base_dtor_identifier, 1 },
2867 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
2868 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
2869 { "nelts", &nelts_identifier, 0 },
2870 { THIS_NAME, &this_identifier, 0 },
2871 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
2872 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
2873 { "_vptr", &vptr_identifier, 0 },
2874 { "__vtt_parm", &vtt_parm_identifier, 0 },
2875 { "::", &global_scope_name, 0 },
2876 { "std", &std_identifier, 0 },
2880 for (pid = predefined_identifiers; pid->name; ++pid)
2882 *pid->node = get_identifier (pid->name);
2883 if (pid->ctor_or_dtor_p)
2884 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
2888 /* Create the predefined scalar types of C,
2889 and some nodes representing standard constants (0, 1, (void *)0).
2890 Initialize the global binding level.
2891 Make definitions for built-in primitive functions. */
2894 cxx_init_decl_processing (void)
2897 tree void_ftype_ptr;
2899 build_common_tree_nodes (flag_signed_char, false);
2901 /* Create all the identifiers we need. */
2902 initialize_predefined_identifiers ();
2904 /* Create the global variables. */
2905 push_to_top_level ();
2907 current_function_decl = NULL_TREE;
2908 current_binding_level = NULL;
2909 /* Enter the global namespace. */
2910 gcc_assert (global_namespace == NULL_TREE);
2911 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
2913 begin_scope (sk_namespace, global_namespace);
2915 current_lang_name = NULL_TREE;
2917 /* Adjust various flags based on command-line settings. */
2918 if (!flag_permissive)
2919 flag_pedantic_errors = 1;
2920 if (!flag_no_inline)
2922 flag_inline_trees = 1;
2925 if (flag_inline_functions)
2926 flag_inline_trees = 2;
2928 /* Force minimum function alignment if using the least significant
2929 bit of function pointers to store the virtual bit. */
2930 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
2931 && force_align_functions_log < 1)
2932 force_align_functions_log = 1;
2935 current_lang_name = lang_name_c;
2937 error_mark_list = build_tree_list (error_mark_node, error_mark_node);
2938 TREE_TYPE (error_mark_list) = error_mark_node;
2940 /* Create the `std' namespace. */
2941 push_namespace (std_identifier);
2942 std_node = current_namespace;
2945 c_common_nodes_and_builtins ();
2947 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
2948 java_short_type_node = record_builtin_java_type ("__java_short", 16);
2949 java_int_type_node = record_builtin_java_type ("__java_int", 32);
2950 java_long_type_node = record_builtin_java_type ("__java_long", 64);
2951 java_float_type_node = record_builtin_java_type ("__java_float", -32);
2952 java_double_type_node = record_builtin_java_type ("__java_double", -64);
2953 java_char_type_node = record_builtin_java_type ("__java_char", -16);
2954 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
2956 integer_two_node = build_int_cst (NULL_TREE, 2);
2957 integer_three_node = build_int_cst (NULL_TREE, 3);
2959 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
2960 truthvalue_type_node = boolean_type_node;
2961 truthvalue_false_node = boolean_false_node;
2962 truthvalue_true_node = boolean_true_node;
2964 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
2967 record_builtin_type (RID_MAX, NULL, string_type_node);
2970 delta_type_node = ptrdiff_type_node;
2971 vtable_index_type = ptrdiff_type_node;
2973 vtt_parm_type = build_pointer_type (const_ptr_type_node);
2974 void_ftype = build_function_type (void_type_node, void_list_node);
2975 void_ftype_ptr = build_function_type (void_type_node,
2976 tree_cons (NULL_TREE,
2980 = build_exception_variant (void_ftype_ptr, empty_except_spec);
2982 /* C++ extensions */
2984 unknown_type_node = make_node (UNKNOWN_TYPE);
2985 record_unknown_type (unknown_type_node, "unknown type");
2987 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
2988 TREE_TYPE (unknown_type_node) = unknown_type_node;
2990 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
2992 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
2993 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
2996 /* Make sure we get a unique function type, so we can give
2997 its pointer type a name. (This wins for gdb.) */
2998 tree vfunc_type = make_node (FUNCTION_TYPE);
2999 TREE_TYPE (vfunc_type) = integer_type_node;
3000 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
3001 layout_type (vfunc_type);
3003 vtable_entry_type = build_pointer_type (vfunc_type);
3005 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
3008 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
3009 layout_type (vtbl_type_node);
3010 vtbl_type_node = build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
3011 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
3012 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
3013 layout_type (vtbl_ptr_type_node);
3014 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
3016 push_namespace (get_identifier ("__cxxabiv1"));
3017 abi_node = current_namespace;
3020 global_type_node = make_node (LANG_TYPE);
3021 record_unknown_type (global_type_node, "global type");
3024 current_lang_name = lang_name_cplusplus;
3028 tree bad_alloc_type_node;
3029 tree bad_alloc_decl;
3030 tree newtype, deltype;
3031 tree ptr_ftype_sizetype;
3033 push_namespace (std_identifier);
3034 bad_alloc_id = get_identifier ("bad_alloc");
3035 bad_alloc_type_node = make_aggr_type (RECORD_TYPE);
3036 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3038 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3039 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3040 TYPE_STUB_DECL (bad_alloc_type_node) = bad_alloc_decl;
3044 = build_function_type (ptr_type_node,
3045 tree_cons (NULL_TREE,
3048 newtype = build_exception_variant
3049 (ptr_ftype_sizetype, add_exception_specifier
3050 (NULL_TREE, bad_alloc_type_node, -1));
3051 deltype = build_exception_variant (void_ftype_ptr, empty_except_spec);
3052 push_cp_library_fn (NEW_EXPR, newtype);
3053 push_cp_library_fn (VEC_NEW_EXPR, newtype);
3054 global_delete_fndecl = push_cp_library_fn (DELETE_EXPR, deltype);
3055 push_cp_library_fn (VEC_DELETE_EXPR, deltype);
3059 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype);
3061 /* Perform other language dependent initializations. */
3062 init_class_processing ();
3063 init_rtti_processing ();
3065 if (flag_exceptions)
3066 init_exception_processing ();
3068 if (! supports_one_only ())
3071 make_fname_decl = cp_make_fname_decl;
3072 start_fname_decls ();
3074 /* Show we use EH for cleanups. */
3075 if (flag_exceptions)
3076 using_eh_for_cleanups ();
3079 /* Generate an initializer for a function naming variable from
3080 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
3081 filled in with the type of the init. */
3084 cp_fname_init (const char* name, tree *type_p)
3086 tree domain = NULL_TREE;
3088 tree init = NULL_TREE;
3093 length = strlen (name);
3094 domain = build_index_type (size_int (length));
3095 init = build_string (length + 1, name);
3098 type = build_qualified_type (char_type_node, TYPE_QUAL_CONST);
3099 type = build_cplus_array_type (type, domain);
3104 TREE_TYPE (init) = type;
3106 init = error_mark_node;
3111 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
3112 decl, NAME is the initialization string and TYPE_DEP indicates whether
3113 NAME depended on the type of the function. We make use of that to detect
3114 __PRETTY_FUNCTION__ inside a template fn. This is being done
3115 lazily at the point of first use, so we mustn't push the decl now. */
3118 cp_make_fname_decl (tree id, int type_dep)
3120 const char *const name = (type_dep && processing_template_decl
3121 ? NULL : fname_as_string (type_dep));
3123 tree init = cp_fname_init (name, &type);
3124 tree decl = build_decl (VAR_DECL, id, type);
3127 free ((char *) name);
3129 /* As we're using pushdecl_with_scope, we must set the context. */
3130 DECL_CONTEXT (decl) = current_function_decl;
3131 DECL_PRETTY_FUNCTION_P (decl) = type_dep;
3133 TREE_STATIC (decl) = 1;
3134 TREE_READONLY (decl) = 1;
3135 DECL_ARTIFICIAL (decl) = 1;
3136 DECL_INITIAL (decl) = init;
3138 TREE_USED (decl) = 1;
3140 if (current_function_decl)
3142 struct cp_binding_level *b = current_binding_level;
3143 while (b->level_chain->kind != sk_function_parms)
3145 pushdecl_with_scope (decl, b);
3146 cp_finish_decl (decl, init, NULL_TREE, LOOKUP_ONLYCONVERTING);
3149 pushdecl_top_level_and_finish (decl, init);
3154 /* Make a definition for a builtin function named NAME in the current
3155 namespace, whose data type is TYPE and whose context is CONTEXT.
3156 TYPE should be a function type with argument types.
3158 CLASS and CODE tell later passes how to compile calls to this function.
3159 See tree.h for possible values.
3161 If LIBNAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3162 the name to be called if we can't opencode the function.
3163 If ATTRS is nonzero, use that for the function's attribute
3167 builtin_function_1 (const char* name,
3170 enum built_in_function code,
3171 enum built_in_class class,
3172 const char* libname,
3175 tree decl = build_library_fn_1 (get_identifier (name), ERROR_MARK, type);
3176 DECL_BUILT_IN_CLASS (decl) = class;
3177 DECL_FUNCTION_CODE (decl) = code;
3178 DECL_CONTEXT (decl) = context;
3182 /* Since `pushdecl' relies on DECL_ASSEMBLER_NAME instead of DECL_NAME,
3183 we cannot change DECL_ASSEMBLER_NAME until we have installed this
3184 function in the namespace. */
3186 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (libname));
3188 /* Warn if a function in the namespace for users
3189 is used without an occasion to consider it declared. */
3190 if (name[0] != '_' || name[1] != '_')
3191 DECL_ANTICIPATED (decl) = 1;
3193 /* Possibly apply some default attributes to this built-in function. */
3195 decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
3197 decl_attributes (&decl, NULL_TREE, 0);
3202 /* Entry point for the benefit of c_common_nodes_and_builtins.
3204 Make a definition for a builtin function named NAME and whose data type
3205 is TYPE. TYPE should be a function type with argument types. This
3206 function places the anticipated declaration in the global namespace
3207 and additionally in the std namespace if appropriate.
3209 CLASS and CODE tell later passes how to compile calls to this function.
3210 See tree.h for possible values.
3212 If LIBNAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3213 the name to be called if we can't opencode the function.
3215 If ATTRS is nonzero, use that for the function's attribute
3219 builtin_function (const char* name,
3222 enum built_in_class cl,
3223 const char* libname,
3226 /* All builtins that don't begin with an '_' should additionally
3227 go in the 'std' namespace. */
3230 push_namespace (std_identifier);
3231 builtin_function_1 (name, type, std_node, code, cl, libname, attrs);
3235 return builtin_function_1 (name, type, NULL_TREE, code,
3236 cl, libname, attrs);
3239 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
3240 function. Not called directly. */
3243 build_library_fn_1 (tree name, enum tree_code operator_code, tree type)
3245 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
3246 DECL_EXTERNAL (fn) = 1;
3247 TREE_PUBLIC (fn) = 1;
3248 DECL_ARTIFICIAL (fn) = 1;
3249 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
3250 SET_DECL_LANGUAGE (fn, lang_c);
3251 /* Runtime library routines are, by definition, available in an
3252 external shared object. */
3253 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
3254 DECL_VISIBILITY_SPECIFIED (fn) = 1;
3258 /* Returns the _DECL for a library function with C linkage.
3259 We assume that such functions never throw; if this is incorrect,
3260 callers should unset TREE_NOTHROW. */
3263 build_library_fn (tree name, tree type)
3265 tree fn = build_library_fn_1 (name, ERROR_MARK, type);
3266 TREE_NOTHROW (fn) = 1;
3270 /* Returns the _DECL for a library function with C++ linkage. */
3273 build_cp_library_fn (tree name, enum tree_code operator_code, tree type)
3275 tree fn = build_library_fn_1 (name, operator_code, type);
3276 TREE_NOTHROW (fn) = TYPE_NOTHROW_P (type);
3277 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
3278 SET_DECL_LANGUAGE (fn, lang_cplusplus);
3282 /* Like build_library_fn, but takes a C string instead of an
3286 build_library_fn_ptr (const char* name, tree type)
3288 return build_library_fn (get_identifier (name), type);
3291 /* Like build_cp_library_fn, but takes a C string instead of an
3295 build_cp_library_fn_ptr (const char* name, tree type)
3297 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type);
3300 /* Like build_library_fn, but also pushes the function so that we will
3301 be able to find it via IDENTIFIER_GLOBAL_VALUE. */
3304 push_library_fn (tree name, tree type)
3306 tree fn = build_library_fn (name, type);
3307 pushdecl_top_level (fn);
3311 /* Like build_cp_library_fn, but also pushes the function so that it
3312 will be found by normal lookup. */
3315 push_cp_library_fn (enum tree_code operator_code, tree type)
3317 tree fn = build_cp_library_fn (ansi_opname (operator_code),
3324 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
3328 push_void_library_fn (tree name, tree parmtypes)
3330 tree type = build_function_type (void_type_node, parmtypes);
3331 return push_library_fn (name, type);
3334 /* Like push_library_fn, but also note that this function throws
3335 and does not return. Used for __throw_foo and the like. */
3338 push_throw_library_fn (tree name, tree type)
3340 tree fn = push_library_fn (name, type);
3341 TREE_THIS_VOLATILE (fn) = 1;
3342 TREE_NOTHROW (fn) = 0;
3346 /* When we call finish_struct for an anonymous union, we create
3347 default copy constructors and such. But, an anonymous union
3348 shouldn't have such things; this function undoes the damage to the
3349 anonymous union type T.
3351 (The reason that we create the synthesized methods is that we don't
3352 distinguish `union { int i; }' from `typedef union { int i; } U'.
3353 The first is an anonymous union; the second is just an ordinary
3357 fixup_anonymous_aggr (tree t)
3361 /* Wipe out memory of synthesized methods. */
3362 TYPE_HAS_CONSTRUCTOR (t) = 0;
3363 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
3364 TYPE_HAS_INIT_REF (t) = 0;
3365 TYPE_HAS_CONST_INIT_REF (t) = 0;
3366 TYPE_HAS_ASSIGN_REF (t) = 0;
3367 TYPE_HAS_CONST_ASSIGN_REF (t) = 0;
3369 /* Splice the implicitly generated functions out of the TYPE_METHODS
3371 q = &TYPE_METHODS (t);
3374 if (DECL_ARTIFICIAL (*q))
3375 *q = TREE_CHAIN (*q);
3377 q = &TREE_CHAIN (*q);
3380 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
3381 if (TYPE_METHODS (t))
3382 error ("%Jan anonymous union cannot have function members",
3383 TYPE_MAIN_DECL (t));
3385 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
3386 assignment operators (because they cannot have these methods themselves).
3387 For anonymous unions this is already checked because they are not allowed
3388 in any union, otherwise we have to check it. */
3389 if (TREE_CODE (t) != UNION_TYPE)
3393 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
3394 if (TREE_CODE (field) == FIELD_DECL)
3396 type = TREE_TYPE (field);
3397 if (CLASS_TYPE_P (type))
3399 if (TYPE_NEEDS_CONSTRUCTING (type))
3400 error ("member %q+#D with constructor not allowed "
3401 "in anonymous aggregate", field);
3402 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
3403 error ("member %q+#D with destructor not allowed "
3404 "in anonymous aggregate", field);
3405 if (TYPE_HAS_COMPLEX_ASSIGN_REF (type))
3406 error ("member %q+#D with copy assignment operator "
3407 "not allowed in anonymous aggregate", field);
3413 /* Make sure that a declaration with no declarator is well-formed, i.e.
3414 just declares a tagged type or anonymous union.
3416 Returns the type declared; or NULL_TREE if none. */
3419 check_tag_decl (cp_decl_specifier_seq *declspecs)
3421 int saw_friend = declspecs->specs[(int)ds_friend] != 0;
3422 int saw_typedef = declspecs->specs[(int)ds_typedef] != 0;
3423 /* If a class, struct, or enum type is declared by the DECLSPECS
3424 (i.e, if a class-specifier, enum-specifier, or non-typename
3425 elaborated-type-specifier appears in the DECLSPECS),
3426 DECLARED_TYPE is set to the corresponding type. */
3427 tree declared_type = NULL_TREE;
3428 bool error_p = false;
3430 if (declspecs->multiple_types_p)
3431 error ("multiple types in one declaration");
3432 else if (declspecs->redefined_builtin_type)
3434 if (!in_system_header)
3435 pedwarn ("redeclaration of C++ built-in type %qT",
3436 declspecs->redefined_builtin_type);
3441 && TYPE_P (declspecs->type)
3442 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
3443 && IS_AGGR_TYPE (declspecs->type))
3444 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
3445 declared_type = declspecs->type;
3446 else if (declspecs->type == error_mark_node)
3448 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
3449 pedwarn ("declaration does not declare anything");
3450 /* Check for an anonymous union. */
3451 else if (declared_type && IS_AGGR_TYPE_CODE (TREE_CODE (declared_type))
3452 && TYPE_ANONYMOUS_P (declared_type))
3454 /* 7/3 In a simple-declaration, the optional init-declarator-list
3455 can be omitted only when declaring a class (clause 9) or
3456 enumeration (7.2), that is, when the decl-specifier-seq contains
3457 either a class-specifier, an elaborated-type-specifier with
3458 a class-key (9.1), or an enum-specifier. In these cases and
3459 whenever a class-specifier or enum-specifier is present in the
3460 decl-specifier-seq, the identifiers in these specifiers are among
3461 the names being declared by the declaration (as class-name,
3462 enum-names, or enumerators, depending on the syntax). In such
3463 cases, and except for the declaration of an unnamed bit-field (9.6),
3464 the decl-specifier-seq shall introduce one or more names into the
3465 program, or shall redeclare a name introduced by a previous
3466 declaration. [Example:
3467 enum { }; // ill-formed
3468 typedef class { }; // ill-formed
3472 error ("missing type-name in typedef-declaration");
3475 /* Anonymous unions are objects, so they can have specifiers. */;
3476 SET_ANON_AGGR_TYPE_P (declared_type);
3478 if (TREE_CODE (declared_type) != UNION_TYPE && pedantic
3479 && !in_system_header)
3480 pedwarn ("ISO C++ prohibits anonymous structs");
3485 if (declspecs->specs[(int)ds_inline]
3486 || declspecs->specs[(int)ds_virtual])
3487 error ("%qs can only be specified for functions",
3488 declspecs->specs[(int)ds_inline]
3489 ? "inline" : "virtual");
3491 && (!current_class_type
3492 || current_scope () != current_class_type))
3493 error ("%<friend%> can only be specified inside a class");
3494 else if (declspecs->specs[(int)ds_explicit])
3495 error ("%<explicit%> can only be specified for constructors");
3496 else if (declspecs->storage_class)
3497 error ("a storage class can only be specified for objects "
3499 else if (declspecs->specs[(int)ds_const]
3500 || declspecs->specs[(int)ds_volatile]
3501 || declspecs->specs[(int)ds_restrict]
3502 || declspecs->specs[(int)ds_thread])
3503 error ("qualifiers can only be specified for objects "
3507 return declared_type;
3510 /* Called when a declaration is seen that contains no names to declare.
3511 If its type is a reference to a structure, union or enum inherited
3512 from a containing scope, shadow that tag name for the current scope
3513 with a forward reference.
3514 If its type defines a new named structure or union
3515 or defines an enum, it is valid but we need not do anything here.
3516 Otherwise, it is an error.
3518 C++: may have to grok the declspecs to learn about static,
3519 complain for anonymous unions.
3521 Returns the TYPE declared -- or NULL_TREE if none. */
3524 shadow_tag (cp_decl_specifier_seq *declspecs)
3526 tree t = check_tag_decl (declspecs);
3531 if (declspecs->attributes)
3533 warning (0, "attribute ignored in declaration of %q+#T", t);
3534 warning (0, "attribute for %q+#T must follow the %qs keyword",
3535 t, class_key_or_enum_as_string (t));
3539 maybe_process_partial_specialization (t);
3541 /* This is where the variables in an anonymous union are
3542 declared. An anonymous union declaration looks like:
3544 because there is no declarator after the union, the parser
3545 sends that declaration here. */
3546 if (ANON_AGGR_TYPE_P (t))
3548 fixup_anonymous_aggr (t);
3550 if (TYPE_FIELDS (t))
3552 tree decl = grokdeclarator (/*declarator=*/NULL,
3553 declspecs, NORMAL, 0, NULL);
3554 finish_anon_union (decl);
3561 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3564 groktypename (cp_decl_specifier_seq *type_specifiers,
3565 const cp_declarator *declarator)
3569 attrs = type_specifiers->attributes;
3570 type_specifiers->attributes = NULL_TREE;
3571 type = grokdeclarator (declarator, type_specifiers, TYPENAME, 0, &attrs);
3573 cplus_decl_attributes (&type, attrs, 0);
3577 /* Decode a declarator in an ordinary declaration or data definition.
3578 This is called as soon as the type information and variable name
3579 have been parsed, before parsing the initializer if any.
3580 Here we create the ..._DECL node, fill in its type,
3581 and put it on the list of decls for the current context.
3582 The ..._DECL node is returned as the value.
3584 Exception: for arrays where the length is not specified,
3585 the type is left null, to be filled in by `cp_finish_decl'.
3587 Function definitions do not come here; they go to start_function
3588 instead. However, external and forward declarations of functions
3589 do go through here. Structure field declarations are done by
3590 grokfield and not through here. */
3593 start_decl (const cp_declarator *declarator,
3594 cp_decl_specifier_seq *declspecs,
3597 tree prefix_attributes,
3598 tree *pushed_scope_p)
3604 *pushed_scope_p = NULL_TREE;
3606 /* This should only be done once on the top most decl. */
3607 if (have_extern_spec)
3609 declspecs->storage_class = sc_extern;
3610 have_extern_spec = false;
3613 /* An object declared as __attribute__((deprecated)) suppresses
3614 warnings of uses of other deprecated items. */
3615 if (lookup_attribute ("deprecated", attributes))
3616 deprecated_state = DEPRECATED_SUPPRESS;
3618 attributes = chainon (attributes, prefix_attributes);
3620 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
3623 deprecated_state = DEPRECATED_NORMAL;
3625 if (decl == NULL_TREE || TREE_CODE (decl) == VOID_TYPE)
3626 return error_mark_node;
3628 type = TREE_TYPE (decl);
3630 if (type == error_mark_node)
3631 return error_mark_node;
3633 context = DECL_CONTEXT (decl);
3637 *pushed_scope_p = push_scope (context);
3639 /* We are only interested in class contexts, later. */
3640 if (TREE_CODE (context) == NAMESPACE_DECL)
3641 context = NULL_TREE;
3645 /* Is it valid for this decl to have an initializer at all?
3646 If not, set INITIALIZED to zero, which will indirectly
3647 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
3648 switch (TREE_CODE (decl))
3651 error ("typedef %qD is initialized (use __typeof__ instead)", decl);
3656 error ("function %q#D is initialized like a variable", decl);
3666 if (! toplevel_bindings_p ()
3667 && DECL_EXTERNAL (decl))
3668 warning (0, "declaration of %q#D has %<extern%> and is initialized",
3670 DECL_EXTERNAL (decl) = 0;
3671 if (toplevel_bindings_p ())
3672 TREE_STATIC (decl) = 1;
3674 /* Tell `pushdecl' this is an initialized decl
3675 even though we don't yet have the initializer expression.
3676 Also tell `cp_finish_decl' it may store the real initializer. */
3677 DECL_INITIAL (decl) = error_mark_node;
3680 /* Set attributes here so if duplicate decl, will have proper attributes. */
3681 cplus_decl_attributes (&decl, attributes, 0);
3683 /* If #pragma weak was used, mark the decl weak now. */
3684 maybe_apply_pragma_weak (decl);
3686 if (TREE_CODE (decl) == FUNCTION_DECL
3687 && DECL_DECLARED_INLINE_P (decl)
3688 && DECL_UNINLINABLE (decl)
3689 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
3690 warning (0, "inline function %q+D given attribute noinline", decl);
3692 if (context && COMPLETE_TYPE_P (complete_type (context)))
3694 if (TREE_CODE (decl) == VAR_DECL)
3696 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
3697 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
3698 error ("%q#D is not a static member of %q#T", decl, context);
3701 if (DECL_CONTEXT (field) != context)
3703 if (!same_type_p (DECL_CONTEXT (field), context))
3704 pedwarn ("ISO C++ does not permit %<%T::%D%> "
3705 "to be defined as %<%T::%D%>",
3706 DECL_CONTEXT (field), DECL_NAME (decl),
3707 context, DECL_NAME (decl));
3708 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
3710 if (processing_specialization
3711 && template_class_depth (context) == 0
3712 && CLASSTYPE_TEMPLATE_SPECIALIZATION (context))
3713 error ("template header not allowed in member definition "
3714 "of explicitly specialized class");
3715 /* Static data member are tricky; an in-class initialization
3716 still doesn't provide a definition, so the in-class
3717 declaration will have DECL_EXTERNAL set, but will have an
3718 initialization. Thus, duplicate_decls won't warn
3719 about this situation, and so we check here. */
3720 if (DECL_INITIAL (decl)
3721 && DECL_INITIALIZED_IN_CLASS_P (field))
3722 error ("duplicate initialization of %qD", decl);
3723 if (duplicate_decls (decl, field))
3729 tree field = check_classfn (context, decl,
3730 (processing_template_decl
3731 > template_class_depth (context))
3732 ? current_template_parms
3734 if (field && duplicate_decls (decl, field))
3738 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
3739 DECL_IN_AGGR_P (decl) = 0;
3740 /* Do not mark DECL as an explicit specialization if it was not
3741 already marked as an instantiation; a declaration should
3742 never be marked as a specialization unless we know what
3743 template is being specialized. */
3744 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
3746 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
3748 /* [temp.expl.spec] An explicit specialization of a static data
3749 member of a template is a definition if the declaration
3750 includes an initializer; otherwise, it is a declaration.
3752 We check for processing_specialization so this only applies
3753 to the new specialization syntax. */
3754 if (!DECL_INITIAL (decl)
3755 && processing_specialization)
3756 DECL_EXTERNAL (decl) = 1;
3759 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl))
3760 pedwarn ("declaration of %q#D outside of class is not definition",
3764 /* Enter this declaration into the symbol table. */
3765 tem = maybe_push_decl (decl);
3767 if (processing_template_decl)
3768 tem = push_template_decl (tem);
3769 if (tem == error_mark_node)
3770 return error_mark_node;
3772 #if ! defined (ASM_OUTPUT_BSS) && ! defined (ASM_OUTPUT_ALIGNED_BSS)
3773 /* Tell the back-end to use or not use .common as appropriate. If we say
3774 -fconserve-space, we want this to save .data space, at the expense of
3775 wrong semantics. If we say -fno-conserve-space, we want this to
3776 produce errors about redefs; to do this we force variables into the
3778 DECL_COMMON (tem) = ((TREE_CODE (tem) != VAR_DECL
3779 || !DECL_THREAD_LOCAL_P (tem))
3780 && (flag_conserve_space || ! TREE_PUBLIC (tem)));
3783 if (! processing_template_decl)
3790 start_decl_1 (tree decl)
3792 tree type = TREE_TYPE (decl);
3793 int initialized = (DECL_INITIAL (decl) != NULL_TREE);
3795 if (type == error_mark_node)
3799 /* Is it valid for this decl to have an initializer at all?
3800 If not, set INITIALIZED to zero, which will indirectly
3801 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
3803 /* Don't allow initializations for incomplete types except for
3804 arrays which might be completed by the initialization. */
3805 if (COMPLETE_TYPE_P (complete_type (type)))
3806 ; /* A complete type is ok. */
3807 else if (TREE_CODE (type) != ARRAY_TYPE)
3809 error ("variable %q#D has initializer but incomplete type", decl);
3811 type = TREE_TYPE (decl) = error_mark_node;
3813 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
3815 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
3816 error ("elements of array %q#D have incomplete type", decl);
3817 /* else we already gave an error in start_decl. */
3823 && TREE_CODE (decl) != TYPE_DECL
3824 && TREE_CODE (decl) != TEMPLATE_DECL
3825 && type != error_mark_node
3826 && IS_AGGR_TYPE (type)
3827 && ! DECL_EXTERNAL (decl))
3829 if ((! processing_template_decl || ! uses_template_parms (type))
3830 && !COMPLETE_TYPE_P (complete_type (type)))
3832 error ("aggregate %q#D has incomplete type and cannot be defined",
3834 /* Change the type so that assemble_variable will give
3835 DECL an rtl we can live with: (mem (const_int 0)). */
3836 type = TREE_TYPE (decl) = error_mark_node;
3840 /* If any base type in the hierarchy of TYPE needs a constructor,
3841 then we set initialized to 1. This way any nodes which are
3842 created for the purposes of initializing this aggregate
3843 will live as long as it does. This is necessary for global
3844 aggregates which do not have their initializers processed until
3845 the end of the file. */
3846 initialized = TYPE_NEEDS_CONSTRUCTING (type);
3851 DECL_INITIAL (decl) = NULL_TREE;
3853 /* Create a new scope to hold this declaration if necessary.
3854 Whether or not a new scope is necessary cannot be determined
3855 until after the type has been completed; if the type is a
3856 specialization of a class template it is not until after
3857 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
3858 will be set correctly. */
3859 maybe_push_cleanup_level (type);
3862 /* Handle initialization of references. DECL, TYPE, and INIT have the
3863 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
3864 but will be set to a new CLEANUP_STMT if a temporary is created
3865 that must be destroyed subsequently.
3867 Returns an initializer expression to use to initialize DECL, or
3868 NULL if the initialization can be performed statically.
3870 Quotes on semantics can be found in ARM 8.4.3. */
3873 grok_reference_init (tree decl, tree type, tree init, tree *cleanup)
3877 if (init == NULL_TREE)
3879 if ((DECL_LANG_SPECIFIC (decl) == 0
3880 || DECL_IN_AGGR_P (decl) == 0)
3881 && ! DECL_THIS_EXTERN (decl))
3882 error ("%qD declared as reference but not initialized", decl);
3886 if (TREE_CODE (init) == CONSTRUCTOR)
3888 error ("ISO C++ forbids use of initializer list to "
3889 "initialize reference %qD", decl);
3893 if (TREE_CODE (init) == TREE_LIST)
3894 init = build_x_compound_expr_from_list (init, "initializer");
3896 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
3897 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
3898 /* Note: default conversion is only called in very special cases. */
3899 init = decay_conversion (init);
3901 /* Convert INIT to the reference type TYPE. This may involve the
3902 creation of a temporary, whose lifetime must be the same as that
3903 of the reference. If so, a DECL_EXPR for the temporary will be
3904 added just after the DECL_EXPR for DECL. That's why we don't set
3905 DECL_INITIAL for local references (instead assigning to them
3906 explicitly); we need to allow the temporary to be initialized
3908 tmp = initialize_reference (type, init, decl, cleanup);
3910 if (tmp == error_mark_node)
3912 else if (tmp == NULL_TREE)
3914 error ("cannot initialize %qT from %qT", type, TREE_TYPE (init));
3918 if (TREE_STATIC (decl) && !TREE_CONSTANT (tmp))
3921 DECL_INITIAL (decl) = tmp;
3926 /* When parsing `int a[] = {1, 2};' we don't know the size of the
3927 array until we finish parsing the initializer. If that's the
3928 situation we're in, update DECL accordingly. */
3931 maybe_deduce_size_from_array_init (tree decl, tree init)
3933 tree type = TREE_TYPE (decl);
3935 if (TREE_CODE (type) == ARRAY_TYPE
3936 && TYPE_DOMAIN (type) == NULL_TREE
3937 && TREE_CODE (decl) != TYPE_DECL)
3939 /* do_default is really a C-ism to deal with tentative definitions.
3940 But let's leave it here to ease the eventual merge. */
3941 int do_default = !DECL_EXTERNAL (decl);
3942 tree initializer = init ? init : DECL_INITIAL (decl);
3943 int failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
3947 error ("initializer fails to determine size of %qD", decl);
3952 error ("array size missing in %qD", decl);
3953 /* If a `static' var's size isn't known, make it extern as
3954 well as static, so it does not get allocated. If it's not
3955 `static', then don't mark it extern; finish_incomplete_decl
3956 will give it a default size and it will get allocated. */
3957 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
3958 DECL_EXTERNAL (decl) = 1;
3962 error ("zero-size array %qD", decl);
3964 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
3966 layout_decl (decl, 0);
3970 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
3971 any appropriate error messages regarding the layout. */
3974 layout_var_decl (tree decl)
3976 tree type = TREE_TYPE (decl);
3978 /* If we haven't already layed out this declaration, do so now.
3979 Note that we must not call complete type for an external object
3980 because it's type might involve templates that we are not
3981 supposed to instantiate yet. (And it's perfectly valid to say
3982 `extern X x' for some incomplete type `X'.) */
3983 if (!DECL_EXTERNAL (decl))
3984 complete_type (type);
3985 if (!DECL_SIZE (decl)
3986 && TREE_TYPE (decl) != error_mark_node
3987 && (COMPLETE_TYPE_P (type)
3988 || (TREE_CODE (type) == ARRAY_TYPE
3989 && !TYPE_DOMAIN (type)
3990 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
3991 layout_decl (decl, 0);
3993 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
3995 /* An automatic variable with an incomplete type: that is an error.
3996 Don't talk about array types here, since we took care of that
3997 message in grokdeclarator. */
3998 error ("storage size of %qD isn't known", decl);
3999 TREE_TYPE (decl) = error_mark_node;
4002 /* Keep this code around in case we later want to control debug info
4003 based on whether a type is "used". (jason 1999-11-11) */
4005 else if (!DECL_EXTERNAL (decl) && IS_AGGR_TYPE (ttype))
4006 /* Let debugger know it should output info for this type. */
4007 note_debug_info_needed (ttype);
4009 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4010 note_debug_info_needed (DECL_CONTEXT (decl));
4013 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4014 && DECL_SIZE (decl) != NULL_TREE
4015 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4017 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4018 constant_expression_warning (DECL_SIZE (decl));
4020 error ("storage size of %qD isn't constant", decl);
4023 if (TREE_STATIC (decl)
4024 && !DECL_ARTIFICIAL (decl)
4025 && current_function_decl
4026 && DECL_CONTEXT (decl) == current_function_decl)
4027 push_local_name (decl);
4030 /* If a local static variable is declared in an inline function, or if
4031 we have a weak definition, we must endeavor to create only one
4032 instance of the variable at link-time. */
4035 maybe_commonize_var (tree decl)
4037 /* Static data in a function with comdat linkage also has comdat
4039 if (TREE_STATIC (decl)
4040 /* Don't mess with __FUNCTION__. */
4041 && ! DECL_ARTIFICIAL (decl)
4042 && DECL_FUNCTION_SCOPE_P (decl)
4043 /* Unfortunately, import_export_decl has not always been called
4044 before the function is processed, so we cannot simply check
4046 && (DECL_COMDAT (DECL_CONTEXT (decl))
4047 || ((DECL_DECLARED_INLINE_P (DECL_CONTEXT (decl))
4048 || DECL_TEMPLATE_INSTANTIATION (DECL_CONTEXT (decl)))
4049 && TREE_PUBLIC (DECL_CONTEXT (decl)))))
4053 /* With weak symbols, we simply make the variable COMDAT;
4054 that will cause copies in multiple translations units to
4056 comdat_linkage (decl);
4060 if (DECL_INITIAL (decl) == NULL_TREE
4061 || DECL_INITIAL (decl) == error_mark_node)
4063 /* Without weak symbols, we can use COMMON to merge
4064 uninitialized variables. */
4065 TREE_PUBLIC (decl) = 1;
4066 DECL_COMMON (decl) = 1;
4070 /* While for initialized variables, we must use internal
4071 linkage -- which means that multiple copies will not
4073 TREE_PUBLIC (decl) = 0;
4074 DECL_COMMON (decl) = 0;
4075 warning (0, "sorry: semantics of inline function static "
4076 "data %q+#D are wrong (you'll wind up "
4077 "with multiple copies)", decl);
4078 warning (0, "%J you can work around this by removing "
4084 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4085 /* Set it up again; we might have set DECL_INITIAL since the last
4087 comdat_linkage (decl);
4090 /* Issue an error message if DECL is an uninitialized const variable. */
4093 check_for_uninitialized_const_var (tree decl)
4095 tree type = TREE_TYPE (decl);
4097 /* ``Unless explicitly declared extern, a const object does not have
4098 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4100 if (TREE_CODE (decl) == VAR_DECL
4101 && TREE_CODE (type) != REFERENCE_TYPE
4102 && CP_TYPE_CONST_P (type)
4103 && !TYPE_NEEDS_CONSTRUCTING (type)
4104 && !DECL_INITIAL (decl))
4105 error ("uninitialized const %qD", decl);
4109 /* Structure holding the current initializer being processed by reshape_init.
4110 CUR is a pointer to the current element being processed, END is a pointer
4111 after the last element present in the initializer. */
4112 typedef struct reshape_iterator_t
4114 constructor_elt *cur;
4115 constructor_elt *end;
4118 static tree reshape_init_r (tree, reshape_iter *, bool);
4120 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4121 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4122 initialized. If there are no more such fields, the return value
4126 next_initializable_field (tree field)
4129 && (TREE_CODE (field) != FIELD_DECL
4130 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4131 || DECL_ARTIFICIAL (field)))
4132 field = TREE_CHAIN (field);
4137 /* Subroutine of reshape_init_array and reshape_init_vector, which does
4138 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
4139 INTEGER_CST representing the size of the array minus one (the maximum index),
4140 or NULL_TREE if the array was declared without specifying the size. D is
4141 the iterator within the constructor. */
4144 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d)
4147 bool sized_array_p = (max_index != NULL_TREE);
4148 unsigned HOST_WIDE_INT max_index_cst = 0;
4149 unsigned HOST_WIDE_INT index;
4151 /* The initializer for an array is always a CONSTRUCTOR. */
4152 new_init = build_constructor (NULL_TREE, NULL);
4156 if (host_integerp (max_index, 1))
4157 max_index_cst = tree_low_cst (max_index, 1);
4158 /* sizetype is sign extended, not zero extended. */
4160 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
4164 /* Loop until there are no more initializers. */
4166 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
4173 /* Handle array designated initializers (GNU extension). */
4174 if (TREE_CODE (d->cur->index) == IDENTIFIER_NODE)
4176 error ("name %qD used in a GNU-style designated "
4177 "initializer for an array", d->cur->index);
4183 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false);
4184 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), NULL_TREE, elt_init);
4190 /* Subroutine of reshape_init_r, processes the initializers for arrays.
4191 Parameters are the same of reshape_init_r. */
4194 reshape_init_array (tree type, reshape_iter *d)
4196 tree max_index = NULL_TREE;
4198 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
4200 if (TYPE_DOMAIN (type))
4201 max_index = array_type_nelts (type);
4203 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4206 /* Subroutine of reshape_init_r, processes the initializers for vectors.
4207 Parameters are the same of reshape_init_r. */
4210 reshape_init_vector (tree type, reshape_iter *d)
4212 tree max_index = NULL_TREE;
4215 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
4217 if (TREE_CODE (d->cur->value) == CONSTRUCTOR
4218 && TREE_HAS_CONSTRUCTOR (d->cur->value))
4220 tree value = d->cur->value;
4221 if (!same_type_p (TREE_TYPE (value), type))
4223 error ("invalid type %qT as initializer for a vector of type %qT",
4224 TREE_TYPE (d->cur->value), type);
4225 value = error_mark_node;
4231 /* For a vector, the representation type is a struct
4232 containing a single member which is an array of the
4233 appropriate size. */
4234 rtype = TYPE_DEBUG_REPRESENTATION_TYPE (type);
4235 if (rtype && TYPE_DOMAIN (TREE_TYPE (TYPE_FIELDS (rtype))))
4236 max_index = array_type_nelts (TREE_TYPE (TYPE_FIELDS (rtype)));
4238 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4241 /* Subroutine of reshape_init_r, processes the initializers for classes
4242 or union. Parameters are the same of reshape_init_r. */
4245 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p)
4250 gcc_assert (CLASS_TYPE_P (type));
4252 /* The initializer for a class is always a CONSTRUCTOR. */
4253 new_init = build_constructor (NULL_TREE, NULL);
4254 field = next_initializable_field (TYPE_FIELDS (type));
4260 An initializer for an aggregate member that is an
4261 empty class shall have the form of an empty
4262 initializer-list {}. */
4263 if (!first_initializer_p)
4265 error ("initializer for %qT must be brace-enclosed", type);
4266 return error_mark_node;
4271 /* Loop through the initializable fields, gathering initializers. */
4272 while (d->cur != d->end)
4276 /* Handle designated initializers, as an extension. */
4280 pedwarn ("ISO C++ does not allow designated initializers");
4282 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
4284 if (!field || TREE_CODE (field) != FIELD_DECL)
4285 error ("%qT has no non-static data member named %qD", type,
4289 /* If we processed all the member of the class, we are done. */
4293 field_init = reshape_init_r (TREE_TYPE (field), d,
4294 /*first_initializer_p=*/false);
4295 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
4299 When a union is initialized with a brace-enclosed
4300 initializer, the braces shall only contain an
4301 initializer for the first member of the union. */
4302 if (TREE_CODE (type) == UNION_TYPE)
4305 field = next_initializable_field (TREE_CHAIN (field));
4311 /* Subroutine of reshape_init, which processes a single initializer (part of
4312 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
4313 iterator within the CONSTRUCTOR which points to the initializer to process.
4314 FIRST_INITIALIZER_P is true if this is the first initializer of the
4315 CONSTRUCTOR node. */
4318 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p)
4320 tree init = d->cur->value;
4322 /* A non-aggregate type is always initialized with a single
4324 if (!CP_AGGREGATE_TYPE_P (type))
4326 /* It is invalid to initialize a non-aggregate type with a
4327 brace-enclosed initializer.
4328 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
4329 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
4330 a CONSTRUCTOR (with a record type). */
4331 if (TREE_CODE (init) == CONSTRUCTOR
4332 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
4334 error ("braces around scalar initializer for type %qT", type);
4335 init = error_mark_node;
4344 All implicit type conversions (clause _conv_) are considered when
4345 initializing the aggregate member with an initializer from an
4346 initializer-list. If the initializer can initialize a member,
4347 the member is initialized. Otherwise, if the member is itself a
4348 non-empty subaggregate, brace elision is assumed and the
4349 initializer is considered for the initialization of the first
4350 member of the subaggregate. */
4351 if (TREE_CODE (init) != CONSTRUCTOR
4352 && can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL))
4358 /* [dcl.init.string]
4360 A char array (whether plain char, signed char, or unsigned char)
4361 can be initialized by a string-literal (optionally enclosed in
4362 braces); a wchar_t array can be initialized by a wide
4363 string-literal (optionally enclosed in braces). */
4364 if (TREE_CODE (type) == ARRAY_TYPE
4365 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
4367 tree str_init = init;
4369 /* Strip one level of braces if and only if they enclose a single
4370 element (as allowed by [dcl.init.string]). */
4371 if (!first_initializer_p
4372 && TREE_CODE (str_init) == CONSTRUCTOR
4373 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (str_init)) == 1)
4375 str_init = VEC_index (constructor_elt,
4376 CONSTRUCTOR_ELTS (str_init), 0)->value;
4379 /* If it's a string literal, then it's the initializer for the array
4380 as a whole. Otherwise, continue with normal initialization for
4381 array types (one value per array element). */
4382 if (TREE_CODE (str_init) == STRING_CST)
4389 /* The following cases are about aggregates. If we are not within a full
4390 initializer already, and there is not a CONSTRUCTOR, it means that there
4391 is a missing set of braces (that is, we are processing the case for
4392 which reshape_init exists). */
4393 if (!first_initializer_p)
4395 if (TREE_CODE (init) == CONSTRUCTOR)
4397 /* For a nested compound literal, there is no need to reshape since
4398 brace elision is not allowed. Even if we decided to allow it,
4399 we should add a call to reshape_init in finish_compound_literal,
4400 before calling digest_init, so changing this code would still
4401 not be necessary. */
4402 if (!TREE_HAS_CONSTRUCTOR (init))
4405 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
4406 return reshape_init (type, init);
4409 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
4412 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
4416 /* Dispatch to specialized routines. */
4417 if (CLASS_TYPE_P (type))
4418 return reshape_init_class (type, d, first_initializer_p);
4419 else if (TREE_CODE (type) == ARRAY_TYPE)
4420 return reshape_init_array (type, d);
4421 else if (TREE_CODE (type) == VECTOR_TYPE)
4422 return reshape_init_vector (type, d);
4427 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
4428 brace-enclosed aggregate initializer.
4430 INIT is the CONSTRUCTOR containing the list of initializers describing
4431 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
4432 It may not presently match the shape of the TYPE; for example:
4434 struct S { int a; int b; };
4435 struct S a[] = { 1, 2, 3, 4 };
4437 Here INIT will hold a VEC of four elements, rather than a
4438 VEC of two elements, each itself a VEC of two elements. This
4439 routine transforms INIT from the former form into the latter. The
4440 revised CONSTRUCTOR node is returned. */
4443 reshape_init (tree type, tree init)
4445 VEC(constructor_elt, gc) *v;
4449 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
4450 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
4452 v = CONSTRUCTOR_ELTS (init);
4454 /* An empty constructor does not need reshaping, and it is always a valid
4456 if (VEC_empty (constructor_elt, v))
4459 /* Recurse on this CONSTRUCTOR. */
4460 d.cur = VEC_index (constructor_elt, v, 0);
4461 d.end = d.cur + VEC_length (constructor_elt, v);
4463 new_init = reshape_init_r (type, &d, true);
4465 /* Make sure all the element of the constructor were used. Otherwise,
4466 issue an error about exceeding initializers. */
4468 error ("too many initializers for %qT", type);
4473 /* Verify INIT (the initializer for DECL), and record the
4474 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
4475 grok_reference_init.
4477 If the return value is non-NULL, it is an expression that must be
4478 evaluated dynamically to initialize DECL. */
4481 check_initializer (tree decl, tree init, int flags, tree *cleanup)
4483 tree type = TREE_TYPE (decl);
4484 tree init_code = NULL;
4486 /* If `start_decl' didn't like having an initialization, ignore it now. */
4487 if (init != NULL_TREE && DECL_INITIAL (decl) == NULL_TREE)
4490 /* If an initializer is present, DECL_INITIAL has been
4491 error_mark_node, to indicate that an as-of-yet unevaluated
4492 initialization will occur. From now on, DECL_INITIAL reflects
4493 the static initialization -- if any -- of DECL. */
4494 DECL_INITIAL (decl) = NULL_TREE;
4496 /* Things that are going to be initialized need to have complete
4498 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
4500 if (type == error_mark_node)
4501 /* We will have already complained. */
4503 else if (init && COMPLETE_TYPE_P (type)
4504 && !TREE_CONSTANT (TYPE_SIZE (type)))
4506 error ("variable-sized object %qD may not be initialized", decl);
4509 else if (TREE_CODE (type) == ARRAY_TYPE
4510 && !COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4512 error ("elements of array %q#D have incomplete type", decl);
4515 else if (TREE_CODE (type) != ARRAY_TYPE && !COMPLETE_TYPE_P (type))
4517 error ("%qD has incomplete type", decl);
4518 TREE_TYPE (decl) = error_mark_node;
4522 if (TREE_CODE (decl) == CONST_DECL)
4524 gcc_assert (TREE_CODE (decl) != REFERENCE_TYPE);
4526 DECL_INITIAL (decl) = init;
4528 gcc_assert (init != NULL_TREE);
4531 else if (!DECL_EXTERNAL (decl) && TREE_CODE (type) == REFERENCE_TYPE)
4532 init = grok_reference_init (decl, type, init, cleanup);
4535 /* Do not reshape constructors of vectors (they don't need to be
4537 if (TREE_CODE (init) == CONSTRUCTOR
4538 && !TREE_HAS_CONSTRUCTOR (init)
4539 && !TREE_TYPE (init)) /* ptrmemfunc */
4541 init = reshape_init (type, init);
4543 if ((*targetm.vector_opaque_p) (type))
4545 error ("opaque vector types cannot be initialized");
4546 init = error_mark_node;
4550 /* If DECL has an array type without a specific bound, deduce the
4551 array size from the initializer. */
4552 maybe_deduce_size_from_array_init (decl, init);
4553 type = TREE_TYPE (decl);
4555 if (TYPE_HAS_CONSTRUCTOR (type) || TYPE_NEEDS_CONSTRUCTING (type))
4557 if (TREE_CODE (type) == ARRAY_TYPE)
4558 goto initialize_aggr;
4559 else if (TREE_CODE (init) == CONSTRUCTOR)
4561 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
4562 if (TYPE_NON_AGGREGATE_CLASS (type))
4564 error ("%qD must be initialized by constructor, "
4567 init = error_mark_node;
4570 goto dont_use_constructor;
4574 int saved_stmts_are_full_exprs_p;
4577 saved_stmts_are_full_exprs_p = 0;
4578 if (building_stmt_tree ())
4580 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
4581 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
4583 init = build_aggr_init (decl, init, flags);
4584 if (building_stmt_tree ())
4585 current_stmt_tree ()->stmts_are_full_exprs_p =
4586 saved_stmts_are_full_exprs_p;
4592 dont_use_constructor:
4593 if (TREE_CODE (init) != TREE_VEC)
4595 init_code = store_init_value (decl, init);
4596 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
4597 && DECL_INITIAL (decl)
4598 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
4599 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
4600 warning (0, "array %qD initialized by parenthesized string literal %qE",
4601 decl, DECL_INITIAL (decl));
4606 else if (DECL_EXTERNAL (decl))
4608 else if (TYPE_P (type) && TYPE_NEEDS_CONSTRUCTING (type))
4609 goto initialize_aggr;
4610 else if (IS_AGGR_TYPE (type))
4612 tree core_type = strip_array_types (type);
4614 if (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type))
4615 error ("structure %qD with uninitialized const members", decl);
4616 if (CLASSTYPE_REF_FIELDS_NEED_INIT (core_type))
4617 error ("structure %qD with uninitialized reference members", decl);
4619 check_for_uninitialized_const_var (decl);
4622 check_for_uninitialized_const_var (decl);
4624 if (init && init != error_mark_node)
4625 init_code = build2 (INIT_EXPR, type, decl, init);
4630 /* If DECL is not a local variable, give it RTL. */
4633 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
4635 int toplev = toplevel_bindings_p ();
4637 const char *filename;
4639 /* Set the DECL_ASSEMBLER_NAME for the object. */
4642 /* The `register' keyword, when used together with an
4643 asm-specification, indicates that the variable should be
4644 placed in a particular register. */
4645 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
4647 change_decl_assembler_name (decl, get_identifier (asmspec));
4648 DECL_HARD_REGISTER (decl) = 1;
4652 if (TREE_CODE (decl) == FUNCTION_DECL
4653 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
4654 set_builtin_user_assembler_name (decl, asmspec);
4655 set_user_assembler_name (decl, asmspec);
4659 /* Handle non-variables up front. */
4660 if (TREE_CODE (decl) != VAR_DECL)
4662 rest_of_decl_compilation (decl, toplev, at_eof);
4666 /* If we see a class member here, it should be a static data
4668 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
4670 gcc_assert (TREE_STATIC (decl));
4671 /* An in-class declaration of a static data member should be
4672 external; it is only a declaration, and not a definition. */
4673 if (init == NULL_TREE)
4674 gcc_assert (DECL_EXTERNAL (decl));
4677 /* We don't create any RTL for local variables. */
4678 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
4681 /* We defer emission of local statics until the corresponding
4682 DECL_EXPR is expanded. */
4683 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
4685 /* We try to defer namespace-scope static constants so that they are
4686 not emitted into the object file unnecessarily. */
4687 filename = input_filename;
4688 if (!DECL_VIRTUAL_P (decl)
4689 && TREE_READONLY (decl)
4690 && DECL_INITIAL (decl) != NULL_TREE
4691 && DECL_INITIAL (decl) != error_mark_node
4693 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
4695 && !TREE_PUBLIC (decl))
4697 /* Fool with the linkage of static consts according to #pragma
4699 struct c_fileinfo *finfo = get_fileinfo (lbasename (filename));
4700 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
4702 TREE_PUBLIC (decl) = 1;
4703 DECL_EXTERNAL (decl) = finfo->interface_only;
4708 /* Likewise for template instantiations. */
4709 else if (DECL_LANG_SPECIFIC (decl)
4710 && DECL_IMPLICIT_INSTANTIATION (decl))
4713 /* If we're not deferring, go ahead and assemble the variable. */
4715 rest_of_decl_compilation (decl, toplev, at_eof);
4718 /* Generate code to initialize DECL (a local variable). */
4721 initialize_local_var (tree decl, tree init)
4723 tree type = TREE_TYPE (decl);
4726 gcc_assert (TREE_CODE (decl) == VAR_DECL
4727 || TREE_CODE (decl) == RESULT_DECL);
4728 gcc_assert (!TREE_STATIC (decl));
4730 if (DECL_SIZE (decl) == NULL_TREE)
4732 /* If we used it already as memory, it must stay in memory. */
4733 DECL_INITIAL (decl) = NULL_TREE;
4734 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
4737 if (DECL_SIZE (decl) && type != error_mark_node)
4741 /* Compute and store the initial value. */
4742 already_used = TREE_USED (decl) || TREE_USED (type);
4744 /* Perform the initialization. */
4747 int saved_stmts_are_full_exprs_p;
4749 gcc_assert (building_stmt_tree ());
4750 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
4751 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
4752 finish_expr_stmt (init);
4753 current_stmt_tree ()->stmts_are_full_exprs_p =
4754 saved_stmts_are_full_exprs_p;
4757 /* Set this to 0 so we can tell whether an aggregate which was
4758 initialized was ever used. Don't do this if it has a
4759 destructor, so we don't complain about the 'resource
4760 allocation is initialization' idiom. Now set
4761 attribute((unused)) on types so decls of that type will be
4762 marked used. (see TREE_USED, above.) */
4763 if (TYPE_NEEDS_CONSTRUCTING (type)
4765 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
4766 && DECL_NAME (decl))
4767 TREE_USED (decl) = 0;
4768 else if (already_used)
4769 TREE_USED (decl) = 1;
4772 /* Generate a cleanup, if necessary. */
4773 cleanup = cxx_maybe_build_cleanup (decl);
4774 if (DECL_SIZE (decl) && cleanup)
4775 finish_decl_cleanup (decl, cleanup);
4778 /* DECL is a VAR_DECL for a compiler-generated variable with static
4779 storage duration (like a virtual table) whose initializer is a
4780 compile-time constant. Initialize the variable and provide it to
4784 initialize_artificial_var (tree decl, tree init)
4786 DECL_INITIAL (decl) = build_constructor_from_list (NULL_TREE, init);
4787 DECL_INITIALIZED_P (decl) = 1;
4788 determine_visibility (decl);
4789 layout_var_decl (decl);
4790 maybe_commonize_var (decl);
4791 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
4794 /* Finish processing of a declaration;
4795 install its line number and initial value.
4796 If the length of an array type is not known before,
4797 it must be determined now, from the initial value, or it is an error.
4799 INIT holds the value of an initializer that should be allowed to escape
4802 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
4803 if the (init) syntax was used. */
4806 cp_finish_decl (tree decl, tree init, tree asmspec_tree, int flags)
4810 const char *asmspec = NULL;
4811 int was_readonly = 0;
4812 bool var_definition_p = false;
4814 if (decl == error_mark_node)
4819 error ("assignment (not initialization) in declaration");
4823 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
4825 /* Assume no cleanup is required. */
4826 cleanup = NULL_TREE;
4828 /* If a name was specified, get the string. */
4829 if (global_scope_p (current_binding_level))
4830 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
4832 asmspec = TREE_STRING_POINTER (asmspec_tree);
4834 if (init && TREE_CODE (init) == NAMESPACE_DECL)
4836 error ("cannot initialize %qD to namespace %qD", decl, init);
4840 if (current_class_type
4841 && CP_DECL_CONTEXT (decl) == current_class_type
4842 && TYPE_BEING_DEFINED (current_class_type)
4843 && (DECL_INITIAL (decl) || init))
4844 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
4846 type = TREE_TYPE (decl);
4848 if (type == error_mark_node)
4851 if (processing_template_decl)
4853 /* Add this declaration to the statement-tree. */
4854 if (at_function_scope_p ())
4855 add_decl_expr (decl);
4857 if (init && DECL_INITIAL (decl))
4858 DECL_INITIAL (decl) = init;
4859 if (TREE_CODE (decl) == VAR_DECL
4860 && !DECL_PRETTY_FUNCTION_P (decl)
4861 && !dependent_type_p (TREE_TYPE (decl)))
4862 maybe_deduce_size_from_array_init (decl, init);
4867 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
4868 gcc_assert (TREE_CODE (decl) != PARM_DECL);
4870 /* Take care of TYPE_DECLs up front. */
4871 if (TREE_CODE (decl) == TYPE_DECL)
4873 if (type != error_mark_node
4874 && IS_AGGR_TYPE (type) && DECL_NAME (decl))
4876 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
4877 warning (0, "shadowing previous type declaration of %q#D", decl);
4878 set_identifier_type_value (DECL_NAME (decl), decl);
4881 /* If we have installed this as the canonical typedef for this
4882 type, and that type has not been defined yet, delay emitting
4883 the debug information for it, as we will emit it later. */
4884 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
4885 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
4886 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
4888 rest_of_decl_compilation (decl, DECL_CONTEXT (decl) == NULL_TREE,
4893 /* A reference will be modified here, as it is initialized. */
4894 if (! DECL_EXTERNAL (decl)
4895 && TREE_READONLY (decl)
4896 && TREE_CODE (type) == REFERENCE_TYPE)
4899 TREE_READONLY (decl) = 0;
4902 if (TREE_CODE (decl) == VAR_DECL)
4904 /* Only PODs can have thread-local storage. Other types may require
4905 various kinds of non-trivial initialization. */
4906 if (DECL_THREAD_LOCAL_P (decl) && !pod_type_p (TREE_TYPE (decl)))
4907 error ("%qD cannot be thread-local because it has non-POD type %qT",
4908 decl, TREE_TYPE (decl));
4909 /* Convert the initializer to the type of DECL, if we have not
4910 already initialized DECL. */
4911 if (!DECL_INITIALIZED_P (decl)
4912 /* If !DECL_EXTERNAL then DECL is being defined. In the
4913 case of a static data member initialized inside the
4914 class-specifier, there can be an initializer even if DECL
4915 is *not* defined. */
4916 && (!DECL_EXTERNAL (decl) || init))
4918 init = check_initializer (decl, init, flags, &cleanup);
4919 /* Thread-local storage cannot be dynamically initialized. */
4920 if (DECL_THREAD_LOCAL_P (decl) && init)
4922 error ("%qD is thread-local and so cannot be dynamically "
4923 "initialized", decl);
4927 /* Check that the initializer for a static data member was a
4928 constant. Although we check in the parser that the
4929 initializer is an integral constant expression, we do not
4930 simplify division-by-zero at the point at which it
4931 occurs. Therefore, in:
4933 struct S { static const int i = 7 / 0; };
4935 we issue an error at this point. It would
4936 probably be better to forbid division by zero in
4937 integral constant expressions. */
4938 if (DECL_EXTERNAL (decl) && init)
4940 error ("%qD cannot be initialized by a non-constant expression"
4941 " when being declared", decl);
4942 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
4950 The memory occupied by any object of static storage
4951 duration is zero-initialized at program startup before
4952 any other initialization takes place.
4954 We cannot create an appropriate initializer until after
4955 the type of DECL is finalized. If DECL_INITIAL is set,
4956 then the DECL is statically initialized, and any
4957 necessary zero-initialization has already been performed. */
4958 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
4959 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
4960 /*nelts=*/NULL_TREE,
4961 /*static_storage_p=*/true);
4962 /* Remember that the initialization for this variable has
4964 DECL_INITIALIZED_P (decl) = 1;
4965 /* This declaration is the definition of this variable,
4966 unless we are initializing a static data member within
4967 the class specifier. */
4968 if (!DECL_EXTERNAL (decl))
4969 var_definition_p = true;
4970 /* The variable is being defined, so determine its
4972 determine_visibility (decl);
4974 /* If the variable has an array type, lay out the type, even if
4975 there is no initializer. It is valid to index through the
4976 array, and we must get TYPE_ALIGN set correctly on the array
4978 else if (TREE_CODE (type) == ARRAY_TYPE)
4982 /* Add this declaration to the statement-tree. This needs to happen
4983 after the call to check_initializer so that the DECL_EXPR for a
4984 reference temp is added before the DECL_EXPR for the reference itself. */
4985 if (at_function_scope_p ())
4986 add_decl_expr (decl);
4988 if (TREE_CODE (decl) == VAR_DECL)
4989 layout_var_decl (decl);
4991 /* Output the assembler code and/or RTL code for variables and functions,
4992 unless the type is an undefined structure or union.
4993 If not, it will get done when the type is completed. */
4994 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
4996 if (TREE_CODE (decl) == VAR_DECL)
4997 maybe_commonize_var (decl);
4999 make_rtl_for_nonlocal_decl (decl, init, asmspec);
5001 /* Check for abstractness of the type. Notice that there is no
5002 need to strip array types here since the check for those types
5003 is already done within create_array_type_for_decl. */
5004 if (TREE_CODE (type) == FUNCTION_TYPE
5005 || TREE_CODE (type) == METHOD_TYPE)
5006 abstract_virtuals_error (decl, TREE_TYPE (type));
5008 abstract_virtuals_error (decl, type);
5010 if (TREE_CODE (decl) == FUNCTION_DECL
5011 || TREE_TYPE (decl) == error_mark_node)
5012 /* No initialization required. */
5014 else if (DECL_EXTERNAL (decl)
5015 && ! (DECL_LANG_SPECIFIC (decl)
5016 && DECL_NOT_REALLY_EXTERN (decl)))
5019 DECL_INITIAL (decl) = init;
5023 /* A variable definition. */
5024 if (DECL_FUNCTION_SCOPE_P (decl))
5026 /* Initialize the local variable. */
5027 if (processing_template_decl)
5029 if (init || DECL_INITIAL (decl) == error_mark_node)
5030 DECL_INITIAL (decl) = init;
5032 else if (!TREE_STATIC (decl))
5033 initialize_local_var (decl, init);
5036 /* If a variable is defined, and then a subsequent
5037 definition with external linkage is encountered, we will
5038 get here twice for the same variable. We want to avoid
5039 calling expand_static_init more than once. For variables
5040 that are not static data members, we can call
5041 expand_static_init only when we actually process the
5042 initializer. It is not legal to redeclare a static data
5043 member, so this issue does not arise in that case. */
5044 if (var_definition_p && TREE_STATIC (decl))
5045 expand_static_init (decl, init);
5049 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
5050 reference, insert it in the statement-tree now. */
5052 push_cleanup (decl, cleanup, false);
5057 TREE_READONLY (decl) = 1;
5059 /* If this was marked 'used', be sure it will be output. */
5060 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
5061 mark_decl_referenced (decl);
5064 /* This is here for a midend callback from c-common.c. */
5067 finish_decl (tree decl, tree init, tree asmspec_tree)
5069 cp_finish_decl (decl, init, asmspec_tree, 0);
5072 /* Returns a declaration for a VAR_DECL as if:
5074 extern "C" TYPE NAME;
5076 had been seen. Used to create compiler-generated global
5080 declare_global_var (tree name, tree type)
5084 push_to_top_level ();
5085 decl = build_decl (VAR_DECL, name, type);
5086 TREE_PUBLIC (decl) = 1;
5087 DECL_EXTERNAL (decl) = 1;
5088 DECL_ARTIFICIAL (decl) = 1;
5089 /* If the user has explicitly declared this variable (perhaps
5090 because the code we are compiling is part of a low-level runtime
5091 library), then it is possible that our declaration will be merged
5092 with theirs by pushdecl. */
5093 decl = pushdecl (decl);
5094 cp_finish_decl (decl, NULL_TREE, NULL_TREE, 0);
5095 pop_from_top_level ();
5100 /* Returns a pointer to the `atexit' function. Note that if
5101 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
5102 `__cxa_atexit' function specified in the IA64 C++ ABI. */
5105 get_atexit_node (void)
5112 bool use_aeabi_atexit;
5117 if (flag_use_cxa_atexit)
5119 /* The declaration for `__cxa_atexit' is:
5121 int __cxa_atexit (void (*)(void *), void *, void *)
5123 We build up the argument types and then then function type
5126 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
5127 /* First, build the pointer-to-function type for the first
5129 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
5130 fn_type = build_function_type (void_type_node, arg_types);
5131 fn_ptr_type = build_pointer_type (fn_type);
5132 /* Then, build the rest of the argument types. */
5133 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
5134 if (use_aeabi_atexit)
5136 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
5137 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
5141 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
5142 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
5144 /* And the final __cxa_atexit type. */
5145 fn_type = build_function_type (integer_type_node, arg_types);
5146 fn_ptr_type = build_pointer_type (fn_type);
5147 if (use_aeabi_atexit)
5148 name = "__aeabi_atexit";
5150 name = "__cxa_atexit";
5154 /* The declaration for `atexit' is:
5156 int atexit (void (*)());
5158 We build up the argument types and then then function type
5160 fn_type = build_function_type (void_type_node, void_list_node);
5161 fn_ptr_type = build_pointer_type (fn_type);
5162 arg_types = tree_cons (NULL_TREE, fn_ptr_type, void_list_node);
5163 /* Build the final atexit type. */
5164 fn_type = build_function_type (integer_type_node, arg_types);
5168 /* Now, build the function declaration. */
5169 push_lang_context (lang_name_c);
5170 atexit_fndecl = build_library_fn_ptr (name, fn_type);
5171 mark_used (atexit_fndecl);
5172 pop_lang_context ();
5173 atexit_node = decay_conversion (atexit_fndecl);
5178 /* Returns the __dso_handle VAR_DECL. */
5181 get_dso_handle_node (void)
5183 if (dso_handle_node)
5184 return dso_handle_node;
5186 /* Declare the variable. */
5187 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
5190 return dso_handle_node;
5193 /* Begin a new function with internal linkage whose job will be simply
5194 to destroy some particular variable. */
5196 static GTY(()) int start_cleanup_cnt;
5199 start_cleanup_fn (void)
5206 push_to_top_level ();
5208 /* No need to mangle this. */
5209 push_lang_context (lang_name_c);
5211 /* Build the parameter-types. */
5212 parmtypes = void_list_node;
5213 /* Functions passed to __cxa_atexit take an additional parameter.
5214 We'll just ignore it. After we implement the new calling
5215 convention for destructors, we can eliminate the use of
5216 additional cleanup functions entirely in the -fnew-abi case. */
5217 if (flag_use_cxa_atexit)
5218 parmtypes = tree_cons (NULL_TREE, ptr_type_node, parmtypes);
5219 /* Build the function type itself. */
5220 fntype = build_function_type (void_type_node, parmtypes);
5221 /* Build the name of the function. */
5222 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
5223 /* Build the function declaration. */
5224 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
5225 /* It's a function with internal linkage, generated by the
5227 TREE_PUBLIC (fndecl) = 0;
5228 DECL_ARTIFICIAL (fndecl) = 1;
5229 /* Make the function `inline' so that it is only emitted if it is
5230 actually needed. It is unlikely that it will be inlined, since
5231 it is only called via a function pointer, but we avoid unnecessary
5232 emissions this way. */
5233 DECL_INLINE (fndecl) = 1;
5234 DECL_DECLARED_INLINE_P (fndecl) = 1;
5235 DECL_INTERFACE_KNOWN (fndecl) = 1;
5236 /* Build the parameter. */
5237 if (flag_use_cxa_atexit)
5241 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
5242 DECL_CONTEXT (parmdecl) = fndecl;
5243 TREE_USED (parmdecl) = 1;
5244 DECL_ARGUMENTS (fndecl) = parmdecl;
5248 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
5250 pop_lang_context ();
5252 return current_function_decl;
5255 /* Finish the cleanup function begun by start_cleanup_fn. */
5258 end_cleanup_fn (void)
5260 expand_or_defer_fn (finish_function (0));
5262 pop_from_top_level ();
5265 /* Generate code to handle the destruction of DECL, an object with
5266 static storage duration. */
5269 register_dtor_fn (tree decl)
5276 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
5277 return void_zero_node;
5279 /* Call build_cleanup before we enter the anonymous function so that
5280 any access checks will be done relative to the current scope,
5281 rather than the scope of the anonymous function. */
5282 build_cleanup (decl);
5284 /* Now start the function. */
5285 cleanup = start_cleanup_fn ();
5287 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
5288 to the original function, rather than the anonymous one. That
5289 will make the back-end think that nested functions are in use,
5290 which causes confusion. */
5292 push_deferring_access_checks (dk_no_check);
5293 fcall = build_cleanup (decl);
5294 pop_deferring_access_checks ();
5296 /* Create the body of the anonymous function. */
5297 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
5298 finish_expr_stmt (fcall);
5299 finish_compound_stmt (compound_stmt);
5302 /* Call atexit with the cleanup function. */
5303 cxx_mark_addressable (cleanup);
5304 mark_used (cleanup);
5305 cleanup = build_unary_op (ADDR_EXPR, cleanup, 0);
5306 if (flag_use_cxa_atexit)
5308 args = tree_cons (NULL_TREE,
5309 build_unary_op (ADDR_EXPR, get_dso_handle_node (), 0),
5311 if (targetm.cxx.use_aeabi_atexit ())
5313 args = tree_cons (NULL_TREE, cleanup, args);
5314 args = tree_cons (NULL_TREE, null_pointer_node, args);
5318 args = tree_cons (NULL_TREE, null_pointer_node, args);
5319 args = tree_cons (NULL_TREE, cleanup, args);
5323 args = tree_cons (NULL_TREE, cleanup, NULL_TREE);
5324 return build_function_call (get_atexit_node (), args);
5327 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
5328 is its initializer. Generate code to handle the construction
5329 and destruction of DECL. */
5332 expand_static_init (tree decl, tree init)
5334 gcc_assert (TREE_CODE (decl) == VAR_DECL);
5335 gcc_assert (TREE_STATIC (decl));
5337 /* Some variables require no initialization. */
5339 && !TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))
5340 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
5343 if (DECL_FUNCTION_SCOPE_P (decl))
5345 /* Emit code to perform this initialization but once. */
5346 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
5347 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
5348 tree guard, guard_addr, guard_addr_list;
5349 tree acquire_fn, release_fn, abort_fn;
5352 /* Emit code to perform this initialization but once. This code
5355 static <type> guard;
5356 if (!guard.first_byte) {
5357 if (__cxa_guard_acquire (&guard)) {
5360 // Do initialization.
5361 flag = true; __cxa_guard_release (&guard);
5362 // Register variable for destruction at end of program.
5364 if (!flag) __cxa_guard_abort (&guard);
5368 Note that the `flag' variable is only set to 1 *after* the
5369 initialization is complete. This ensures that an exception,
5370 thrown during the construction, will cause the variable to
5371 reinitialized when we pass through this code again, as per:
5375 If the initialization exits by throwing an exception, the
5376 initialization is not complete, so it will be tried again
5377 the next time control enters the declaration.
5379 This process should be thread-safe, too; multiple threads
5380 should not be able to initialize the variable more than
5383 /* Create the guard variable. */
5384 guard = get_guard (decl);
5386 /* This optimization isn't safe on targets with relaxed memory
5387 consistency. On such targets we force synchronization in
5388 __cxa_guard_acquire. */
5389 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
5391 /* Begin the conditional initialization. */
5392 if_stmt = begin_if_stmt ();
5393 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
5394 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
5397 if (flag_threadsafe_statics)
5399 guard_addr = build_address (guard);
5400 guard_addr_list = build_tree_list (NULL_TREE, guard_addr);
5402 acquire_fn = get_identifier ("__cxa_guard_acquire");
5403 release_fn = get_identifier ("__cxa_guard_release");
5404 abort_fn = get_identifier ("__cxa_guard_abort");
5405 if (!get_global_value_if_present (acquire_fn, &acquire_fn))
5407 tree argtypes = tree_cons (NULL_TREE, TREE_TYPE (guard_addr),
5409 tree vfntype = build_function_type (void_type_node, argtypes);
5410 acquire_fn = push_library_fn
5411 (acquire_fn, build_function_type (integer_type_node, argtypes));
5412 release_fn = push_library_fn (release_fn, vfntype);
5413 abort_fn = push_library_fn (abort_fn, vfntype);
5417 release_fn = identifier_global_value (release_fn);
5418 abort_fn = identifier_global_value (abort_fn);
5421 inner_if_stmt = begin_if_stmt ();
5422 finish_if_stmt_cond (build_call (acquire_fn, guard_addr_list),
5425 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
5426 begin = get_target_expr (boolean_false_node);
5427 flag = TARGET_EXPR_SLOT (begin);
5429 TARGET_EXPR_CLEANUP (begin)
5430 = build3 (COND_EXPR, void_type_node, flag,
5432 build_call (abort_fn, guard_addr_list));
5433 CLEANUP_EH_ONLY (begin) = 1;
5435 /* Do the initialization itself. */
5436 init = add_stmt_to_compound (begin, init);
5437 init = add_stmt_to_compound
5438 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
5439 init = add_stmt_to_compound
5440 (init, build_call (release_fn, guard_addr_list));
5443 init = add_stmt_to_compound (init, set_guard (guard));
5445 /* Use atexit to register a function for destroying this static
5447 init = add_stmt_to_compound (init, register_dtor_fn (decl));
5449 finish_expr_stmt (init);
5451 if (flag_threadsafe_statics)
5453 finish_compound_stmt (inner_then_clause);
5454 finish_then_clause (inner_if_stmt);
5455 finish_if_stmt (inner_if_stmt);
5458 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
5460 finish_compound_stmt (then_clause);
5461 finish_then_clause (if_stmt);
5462 finish_if_stmt (if_stmt);
5466 static_aggregates = tree_cons (init, decl, static_aggregates);
5470 /* Make TYPE a complete type based on INITIAL_VALUE.
5471 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
5472 2 if there was no information (in which case assume 0 if DO_DEFAULT),
5473 3 if the initializer list is empty (in pedantic mode). */
5476 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
5479 tree type, elt_type;
5483 /* An array of character type can be initialized from a
5484 brace-enclosed string constant.
5486 FIXME: this code is duplicated from reshape_init. Probably
5487 we should just call reshape_init here? */
5488 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
5489 && TREE_CODE (initial_value) == CONSTRUCTOR
5490 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
5492 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
5493 tree value = VEC_index (constructor_elt, v, 0)->value;
5495 if (TREE_CODE (value) == STRING_CST
5496 && VEC_length (constructor_elt, v) == 1)
5497 initial_value = value;
5501 failure = complete_array_type (ptype, initial_value, do_default);
5503 /* We can create the array before the element type is complete, which
5504 means that we didn't have these two bits set in the original type
5505 either. In completing the type, we are expected to propagate these
5506 bits. See also complete_type which does the same thing for arrays
5509 if (TYPE_DOMAIN (type))
5511 elt_type = TREE_TYPE (type);
5512 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
5513 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
5514 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
5520 /* Return zero if something is declared to be a member of type
5521 CTYPE when in the context of CUR_TYPE. STRING is the error
5522 message to print in that case. Otherwise, quietly return 1. */
5525 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
5527 if (ctype && ctype != cur_type)
5529 if (flags == DTOR_FLAG)
5530 error ("destructor for alien class %qT cannot be a member", ctype);
5532 error ("constructor for alien class %qT cannot be a member", ctype);
5538 /* Subroutine of `grokdeclarator'. */
5540 /* Generate errors possibly applicable for a given set of specifiers.
5541 This is for ARM $7.1.2. */
5544 bad_specifiers (tree object,
5553 error ("%qD declared as a %<virtual%> %s", object, type);
5555 error ("%qD declared as an %<inline%> %s", object, type);
5557 error ("%<const%> and %<volatile%> function specifiers on "
5558 "%qD invalid in %s declaration",
5561 error ("%q+D declared as a friend", object);
5563 && (TREE_CODE (object) == TYPE_DECL
5564 || (!TYPE_PTRFN_P (TREE_TYPE (object))
5565 && !TYPE_REFFN_P (TREE_TYPE (object))
5566 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
5567 error ("%q+D declared with an exception specification", object);
5570 /* CTYPE is class type, or null if non-class.
5571 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
5573 DECLARATOR is the function's name.
5574 PARMS is a chain of PARM_DECLs for the function.
5575 VIRTUALP is truthvalue of whether the function is virtual or not.
5576 FLAGS are to be passed through to `grokclassfn'.
5577 QUALS are qualifiers indicating whether the function is `const'
5579 RAISES is a list of exceptions that this function can raise.
5580 CHECK is 1 if we must find this method in CTYPE, 0 if we should
5581 not look, and -1 if we should not call `grokclassfn' at all.
5583 SFK is the kind of special function (if any) for the new function.
5585 Returns `NULL_TREE' if something goes wrong, after issuing
5586 applicable error messages. */
5589 grokfndecl (tree ctype,
5593 tree orig_declarator,
5595 enum overload_flags flags,
5602 special_function_kind sfk,
5609 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
5610 int has_default_arg = 0;
5614 type = build_exception_variant (type, raises);
5616 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
5617 DECL_ARGUMENTS (decl) = parms;
5618 /* Propagate volatile out from type to decl. */
5619 if (TYPE_VOLATILE (type))
5620 TREE_THIS_VOLATILE (decl) = 1;
5622 /* If this decl has namespace scope, set that up. */
5624 set_decl_namespace (decl, in_namespace, friendp);
5626 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
5628 /* `main' and builtins have implicit 'C' linkage. */
5629 if ((MAIN_NAME_P (declarator)
5630 || (IDENTIFIER_LENGTH (declarator) > 10
5631 && IDENTIFIER_POINTER (declarator)[0] == '_'
5632 && IDENTIFIER_POINTER (declarator)[1] == '_'
5633 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
5634 && current_lang_name == lang_name_cplusplus
5635 && ctype == NULL_TREE
5636 /* NULL_TREE means global namespace. */
5637 && DECL_CONTEXT (decl) == NULL_TREE)
5638 SET_DECL_LANGUAGE (decl, lang_c);
5640 /* Should probably propagate const out from type to decl I bet (mrs). */
5643 DECL_STATIC_FUNCTION_P (decl) = 1;
5644 DECL_CONTEXT (decl) = ctype;
5648 DECL_CONTEXT (decl) = ctype;
5650 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
5652 if (processing_template_decl)
5653 error ("cannot declare %<::main%> to be a template");
5655 error ("cannot declare %<::main%> to be inline");
5657 error ("cannot declare %<::main%> to be static");
5658 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
5661 error ("%<::main%> must return %<int%>");
5662 TREE_TYPE (TREE_TYPE (decl)) = integer_type_node;
5668 /* Members of anonymous types and local classes have no linkage; make
5669 them internal. If a typedef is made later, this will be changed. */
5670 if (ctype && (TYPE_ANONYMOUS_P (ctype)
5671 || decl_function_context (TYPE_MAIN_DECL (ctype))))
5676 /* [basic.link]: A name with no linkage (notably, the name of a class
5677 or enumeration declared in a local scope) shall not be used to
5678 declare an entity with linkage.
5680 Only check this for public decls for now. See core 319, 389. */
5681 t = no_linkage_check (TREE_TYPE (decl),
5682 /*relaxed_p=*/false);
5685 if (TYPE_ANONYMOUS_P (t))
5687 if (DECL_EXTERN_C_P (decl))
5688 /* Allow this; it's pretty common in C. */;
5691 pedwarn ("non-local function %q#D uses anonymous type",
5693 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
5694 pedwarn ("%q+#D does not refer to the unqualified "
5695 "type, so it is not used for linkage",
5700 pedwarn ("non-local function %q#D uses local type %qT", decl, t);
5704 TREE_PUBLIC (decl) = publicp;
5707 DECL_INTERFACE_KNOWN (decl) = 1;
5708 DECL_NOT_REALLY_EXTERN (decl) = 1;
5711 /* If the declaration was declared inline, mark it as such. */
5713 DECL_DECLARED_INLINE_P (decl) = 1;
5714 /* We inline functions that are explicitly declared inline, or, when
5715 the user explicitly asks us to, all functions. */
5716 if (DECL_DECLARED_INLINE_P (decl)
5717 || (flag_inline_trees == 2 && !DECL_INLINE (decl) && funcdef_flag))
5718 DECL_INLINE (decl) = 1;
5720 DECL_EXTERNAL (decl) = 1;
5721 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
5723 error ("%smember function %qD cannot have cv-qualifier",
5724 (ctype ? "static " : "non-"), decl);
5725 quals = TYPE_UNQUALIFIED;
5728 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl)))
5729 grok_op_properties (decl, /*complain=*/true);
5731 if (ctype && decl_function_context (decl))
5732 DECL_NO_STATIC_CHAIN (decl) = 1;
5734 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
5735 if (TREE_PURPOSE (t)
5736 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
5738 has_default_arg = 1;
5743 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
5747 ("defining explicit specialization %qD in friend declaration",
5751 tree fns = TREE_OPERAND (orig_declarator, 0);
5752 tree args = TREE_OPERAND (orig_declarator, 1);
5754 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
5756 /* Something like `template <class T> friend void f<T>()'. */
5757 error ("invalid use of template-id %qD in declaration "
5758 "of primary template",
5764 /* A friend declaration of the form friend void f<>(). Record
5765 the information in the TEMPLATE_ID_EXPR. */
5766 SET_DECL_IMPLICIT_INSTANTIATION (decl);
5768 if (TREE_CODE (fns) == COMPONENT_REF)
5770 /* Due to bison parser ickiness, we will have already looked
5771 up an operator_name or PFUNCNAME within the current class
5772 (see template_id in parse.y). If the current class contains
5773 such a name, we'll get a COMPONENT_REF here. Undo that. */
5775 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
5776 == current_class_type);
5777 fns = TREE_OPERAND (fns, 1);
5779 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
5780 || TREE_CODE (fns) == OVERLOAD);
5781 DECL_TEMPLATE_INFO (decl) = tree_cons (fns, args, NULL_TREE);
5783 if (has_default_arg)
5785 error ("default arguments are not allowed in declaration "
5786 "of friend template specialization %qD",
5793 error ("%<inline%> is not allowed in declaration of friend "
5794 "template specialization %qD",
5802 /* Make the init_value nonzero so pushdecl knows this is not
5803 tentative. error_mark_node is replaced later with the BLOCK. */
5804 DECL_INITIAL (decl) = error_mark_node;
5806 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
5807 TREE_NOTHROW (decl) = 1;
5809 /* Caller will do the rest of this. */
5813 if (ctype != NULL_TREE)
5815 if (sfk == sfk_constructor)
5816 DECL_CONSTRUCTOR_P (decl) = 1;
5818 grokclassfn (ctype, decl, flags, quals);
5821 decl = check_explicit_specialization (orig_declarator, decl,
5823 2 * (funcdef_flag != 0) +
5824 4 * (friendp != 0));
5825 if (decl == error_mark_node)
5830 cplus_decl_attributes (&decl, *attrlist, 0);
5831 *attrlist = NULL_TREE;
5834 if (ctype != NULL_TREE
5835 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
5840 old_decl = check_classfn (ctype, decl,
5841 (processing_template_decl
5842 > template_class_depth (ctype))
5843 ? current_template_parms
5846 if (old_decl && TREE_CODE (old_decl) == TEMPLATE_DECL)
5847 /* Because grokfndecl is always supposed to return a
5848 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
5849 here. We depend on our callers to figure out that its
5850 really a template that's being returned. */
5851 old_decl = DECL_TEMPLATE_RESULT (old_decl);
5853 if (old_decl && DECL_STATIC_FUNCTION_P (old_decl)
5854 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
5855 /* Remove the `this' parm added by grokclassfn.
5856 XXX Isn't this done in start_function, too? */
5857 revert_static_member_fn (decl);
5858 if (old_decl && DECL_ARTIFICIAL (old_decl))
5859 error ("definition of implicitly-declared %qD", old_decl);
5866 /* Since we've smashed OLD_DECL to its
5867 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
5868 if (TREE_CODE (decl) == TEMPLATE_DECL)
5869 decl = DECL_TEMPLATE_RESULT (decl);
5871 /* Attempt to merge the declarations. This can fail, in
5872 the case of some invalid specialization declarations. */
5873 pushed_scope = push_scope (ctype);
5874 ok = duplicate_decls (decl, old_decl);
5876 pop_scope (pushed_scope);
5879 error ("no %q#D member function declared in class %qT",
5887 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
5890 if (ctype == NULL_TREE || check)
5894 DECL_VIRTUAL_P (decl) = 1;
5899 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
5900 the linkage that DECL will receive in the object file. */
5903 set_linkage_for_static_data_member (tree decl)
5905 /* A static data member always has static storage duration and
5906 external linkage. Note that static data members are forbidden in
5907 local classes -- the only situation in which a class has
5908 non-external linkage. */
5909 TREE_PUBLIC (decl) = 1;
5910 TREE_STATIC (decl) = 1;
5911 /* For non-template classes, static data members are always put
5912 out in exactly those files where they are defined, just as
5913 with ordinary namespace-scope variables. */
5914 if (!processing_template_decl)
5915 DECL_INTERFACE_KNOWN (decl) = 1;
5918 /* Create a VAR_DECL named NAME with the indicated TYPE.
5920 If SCOPE is non-NULL, it is the class type or namespace containing
5921 the variable. If SCOPE is NULL, the variable should is created in
5922 the innermost enclosings scope. */
5925 grokvardecl (tree type,
5927 const cp_decl_specifier_seq *declspecs,
5933 tree explicit_scope;
5935 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
5937 /* Compute the scope in which to place the variable, but remember
5938 whether or not that scope was explicitly specified by the user. */
5939 explicit_scope = scope;
5942 /* An explicit "extern" specifier indicates a namespace-scope
5944 if (declspecs->storage_class == sc_extern)
5945 scope = current_namespace;
5946 else if (!at_function_scope_p ())
5947 scope = current_scope ();
5951 && (/* If the variable is a namespace-scope variable declared in a
5952 template, we need DECL_LANG_SPECIFIC. */
5953 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
5954 /* Similarly for namespace-scope variables with language linkage
5956 || (TREE_CODE (scope) == NAMESPACE_DECL
5957 && current_lang_name != lang_name_cplusplus)
5958 /* Similarly for static data members. */
5960 decl = build_lang_decl (VAR_DECL, name, type);
5962 decl = build_decl (VAR_DECL, name, type);
5964 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
5965 set_decl_namespace (decl, explicit_scope, 0);
5967 DECL_CONTEXT (decl) = scope;
5969 if (declspecs->storage_class == sc_extern)
5971 DECL_THIS_EXTERN (decl) = 1;
5972 DECL_EXTERNAL (decl) = !initialized;
5975 if (DECL_CLASS_SCOPE_P (decl))
5977 set_linkage_for_static_data_member (decl);
5978 /* This function is only called with out-of-class definitions. */
5979 DECL_EXTERNAL (decl) = 0;
5981 /* At top level, either `static' or no s.c. makes a definition
5982 (perhaps tentative), and absence of `static' makes it public. */
5983 else if (toplevel_bindings_p ())
5985 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
5986 && (DECL_THIS_EXTERN (decl) || ! constp));
5987 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
5989 /* Not at top level, only `static' makes a static definition. */
5992 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
5993 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
5996 if (declspecs->specs[(int)ds_thread])
5998 if (targetm.have_tls)
5999 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
6001 /* A mere warning is sure to result in improper semantics
6002 at runtime. Don't bother to allow this to compile. */
6003 error ("thread-local storage not supported for this target");
6006 if (TREE_PUBLIC (decl))
6008 /* [basic.link]: A name with no linkage (notably, the name of a class
6009 or enumeration declared in a local scope) shall not be used to
6010 declare an entity with linkage.
6012 Only check this for public decls for now. */
6013 tree t = no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false);
6016 if (TYPE_ANONYMOUS_P (t))
6018 if (DECL_EXTERN_C_P (decl))
6019 /* Allow this; it's pretty common in C. */
6023 /* DRs 132, 319 and 389 seem to indicate types with
6024 no linkage can only be used to declare extern "C"
6025 entities. Since it's not always an error in the
6026 ISO C++ 90 Standard, we only issue a warning. */
6027 warning (0, "non-local variable %q#D uses anonymous type",
6029 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
6030 warning (0, "%q+#D does not refer to the unqualified "
6031 "type, so it is not used for linkage",
6036 warning (0, "non-local variable %q#D uses local type %qT", decl, t);
6040 DECL_INTERFACE_KNOWN (decl) = 1;
6045 /* Create and return a canonical pointer to member function type, for
6046 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
6049 build_ptrmemfunc_type (tree type)
6053 tree unqualified_variant = NULL_TREE;
6055 if (type == error_mark_node)
6058 /* If a canonical type already exists for this type, use it. We use
6059 this method instead of type_hash_canon, because it only does a
6060 simple equality check on the list of field members. */
6062 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
6065 /* Make sure that we always have the unqualified pointer-to-member
6067 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
6069 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
6071 t = make_aggr_type (RECORD_TYPE);
6072 xref_basetypes (t, NULL_TREE);
6074 /* Let the front-end know this is a pointer to member function... */
6075 TYPE_PTRMEMFUNC_FLAG (t) = 1;
6076 /* ... and not really an aggregate. */
6077 SET_IS_AGGR_TYPE (t, 0);
6079 field = build_decl (FIELD_DECL, pfn_identifier, type);
6082 field = build_decl (FIELD_DECL, delta_identifier, delta_type_node);
6083 TREE_CHAIN (field) = fields;
6086 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
6088 /* Zap out the name so that the back-end will give us the debugging
6089 information for this anonymous RECORD_TYPE. */
6090 TYPE_NAME (t) = NULL_TREE;
6092 /* If this is not the unqualified form of this pointer-to-member
6093 type, set the TYPE_MAIN_VARIANT for this type to be the
6094 unqualified type. Since they are actually RECORD_TYPEs that are
6095 not variants of each other, we must do this manually. */
6096 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
6098 t = build_qualified_type (t, cp_type_quals (type));
6099 TYPE_MAIN_VARIANT (t) = unqualified_variant;
6100 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
6101 TYPE_NEXT_VARIANT (unqualified_variant) = t;
6104 /* Cache this pointer-to-member type so that we can find it again
6106 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
6111 /* Create and return a pointer to data member type. */
6114 build_ptrmem_type (tree class_type, tree member_type)
6116 if (TREE_CODE (member_type) == METHOD_TYPE)
6120 arg_types = TYPE_ARG_TYPES (member_type);
6121 class_type = (cp_build_qualified_type
6123 cp_type_quals (TREE_TYPE (TREE_VALUE (arg_types)))));
6125 = build_method_type_directly (class_type,
6126 TREE_TYPE (member_type),
6127 TREE_CHAIN (arg_types));
6128 return build_ptrmemfunc_type (build_pointer_type (member_type));
6132 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
6133 return build_offset_type (class_type, member_type);
6137 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
6138 Check to see that the definition is valid. Issue appropriate error
6139 messages. Return 1 if the definition is particularly bad, or 0
6143 check_static_variable_definition (tree decl, tree type)
6145 /* Motion 10 at San Diego: If a static const integral data member is
6146 initialized with an integral constant expression, the initializer
6147 may appear either in the declaration (within the class), or in
6148 the definition, but not both. If it appears in the class, the
6149 member is a member constant. The file-scope definition is always
6151 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
6153 error ("invalid in-class initialization of static data member "
6154 "of non-integral type %qT",
6156 /* If we just return the declaration, crashes will sometimes
6157 occur. We therefore return void_type_node, as if this were a
6158 friend declaration, to cause callers to completely ignore
6159 this declaration. */
6162 else if (!CP_TYPE_CONST_P (type))
6163 error ("ISO C++ forbids in-class initialization of non-const "
6164 "static member %qD",
6166 else if (pedantic && !INTEGRAL_TYPE_P (type))
6167 pedwarn ("ISO C++ forbids initialization of member constant "
6168 "%qD of non-integral type %qT", decl, type);
6173 /* Given the SIZE (i.e., number of elements) in an array, compute an
6174 appropriate index type for the array. If non-NULL, NAME is the
6175 name of the thing being declared. */
6178 compute_array_index_type (tree name, tree size)
6180 tree type = TREE_TYPE (size);
6183 /* The array bound must be an integer type. */
6184 if (!dependent_type_p (type) && !INTEGRAL_TYPE_P (type))
6187 error ("size of array %qD has non-integral type %qT", name, type);
6189 error ("size of array has non-integral type %qT", type);
6190 size = integer_one_node;
6191 type = TREE_TYPE (size);
6194 if (abi_version_at_least (2)
6195 /* We should only handle value dependent expressions specially. */
6196 ? value_dependent_expression_p (size)
6197 /* But for abi-1, we handled all instances in templates. This
6198 effects the manglings produced. */
6199 : processing_template_decl)
6200 return build_index_type (build_min (MINUS_EXPR, sizetype,
6201 size, integer_one_node));
6203 /* The size might be the result of a cast. */
6204 STRIP_TYPE_NOPS (size);
6206 /* It might be a const variable or enumeration constant. */
6207 size = integral_constant_value (size);
6209 /* Normally, the array-bound will be a constant. */
6210 if (TREE_CODE (size) == INTEGER_CST)
6212 /* Check to see if the array bound overflowed. Make that an
6213 error, no matter how generous we're being. */
6214 int old_flag_pedantic_errors = flag_pedantic_errors;
6215 int old_pedantic = pedantic;
6216 pedantic = flag_pedantic_errors = 1;
6217 constant_expression_warning (size);
6218 pedantic = old_pedantic;
6219 flag_pedantic_errors = old_flag_pedantic_errors;
6221 /* An array must have a positive number of elements. */
6222 if (INT_CST_LT (size, integer_zero_node))
6225 error ("size of array %qD is negative", name);
6227 error ("size of array is negative");
6228 size = integer_one_node;
6230 /* As an extension we allow zero-sized arrays. We always allow
6231 them in system headers because glibc uses them. */
6232 else if (integer_zerop (size) && pedantic && !in_system_header)
6235 pedwarn ("ISO C++ forbids zero-size array %qD", name);
6237 pedwarn ("ISO C++ forbids zero-size array");
6240 else if (TREE_CONSTANT (size))
6242 /* `(int) &fn' is not a valid array bound. */
6244 error ("size of array %qD is not an integral constant-expression",
6247 error ("size of array is not an integral constant-expression");
6252 pedwarn ("ISO C++ forbids variable-size array %qD", name);
6254 pedwarn ("ISO C++ forbids variable-size array");
6257 if (processing_template_decl && !TREE_CONSTANT (size))
6258 /* A variable sized array. */
6259 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
6262 HOST_WIDE_INT saved_processing_template_decl;
6264 /* Compute the index of the largest element in the array. It is
6265 one less than the number of elements in the array. We save
6266 and restore PROCESSING_TEMPLATE_DECL so that computations in
6267 cp_build_binary_op will be appropriately folded. */
6268 saved_processing_template_decl = processing_template_decl;
6269 processing_template_decl = 0;
6270 itype = cp_build_binary_op (MINUS_EXPR,
6271 cp_convert (ssizetype, size),
6272 cp_convert (ssizetype, integer_one_node));
6273 itype = fold (itype);
6274 processing_template_decl = saved_processing_template_decl;
6276 if (!TREE_CONSTANT (itype))
6277 /* A variable sized array. */
6278 itype = variable_size (itype);
6279 /* Make sure that there was no overflow when creating to a signed
6280 index type. (For example, on a 32-bit machine, an array with
6281 size 2^32 - 1 is too big.) */
6282 else if (TREE_OVERFLOW (itype))
6284 error ("overflow in array dimension");
6285 TREE_OVERFLOW (itype) = 0;
6289 /* Create and return the appropriate index type. */
6290 return build_index_type (itype);
6293 /* Returns the scope (if any) in which the entity declared by
6294 DECLARATOR will be located. If the entity was declared with an
6295 unqualified name, NULL_TREE is returned. */
6298 get_scope_of_declarator (const cp_declarator *declarator)
6300 while (declarator && declarator->kind != cdk_id)
6301 declarator = declarator->declarator;
6303 /* If the declarator-id is a SCOPE_REF, the scope in which the
6304 declaration occurs is the first operand. */
6306 && declarator->u.id.qualifying_scope)
6307 return declarator->u.id.qualifying_scope;
6309 /* Otherwise, the declarator is not a qualified name; the entity will
6310 be declared in the current scope. */
6314 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
6315 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
6319 create_array_type_for_decl (tree name, tree type, tree size)
6321 tree itype = NULL_TREE;
6322 const char* error_msg;
6324 /* If things have already gone awry, bail now. */
6325 if (type == error_mark_node || size == error_mark_node)
6326 return error_mark_node;
6328 /* Assume that everything will go OK. */
6331 /* There are some types which cannot be array elements. */
6332 switch (TREE_CODE (type))
6335 error_msg = "array of void";
6339 error_msg = "array of functions";
6342 case REFERENCE_TYPE:
6343 error_msg = "array of references";
6347 error_msg = "array of function members";
6354 /* If something went wrong, issue an error-message and return. */
6358 error ("declaration of %qD as %s", name, error_msg);
6360 error ("creating %s", error_msg);
6362 return error_mark_node;
6367 The constant expressions that specify the bounds of the arrays
6368 can be omitted only for the first member of the sequence. */
6369 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
6372 error ("declaration of %qD as multidimensional array must "
6373 "have bounds for all dimensions except the first",
6376 error ("multidimensional array must have bounds for all "
6377 "dimensions except the first");
6379 return error_mark_node;
6382 /* Figure out the index type for the array. */
6384 itype = compute_array_index_type (name, size);
6387 T is called the array element type; this type shall not be [...] an
6388 abstract class type. */
6389 abstract_virtuals_error (name, type);
6391 return build_cplus_array_type (type, itype);
6394 /* Check that it's OK to declare a function with the indicated TYPE.
6395 SFK indicates the kind of special function (if any) that this
6396 function is. OPTYPE is the type given in a conversion operator
6397 declaration, or the class type for a constructor/destructor.
6398 Returns the actual return type of the function; that
6399 may be different than TYPE if an error occurs, or for certain
6400 special functions. */
6403 check_special_function_return_type (special_function_kind sfk,
6409 case sfk_constructor:
6411 error ("return type specification for constructor invalid");
6413 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
6414 type = build_pointer_type (optype);
6416 type = void_type_node;
6419 case sfk_destructor:
6421 error ("return type specification for destructor invalid");
6422 /* We can't use the proper return type here because we run into
6423 problems with ambiguous bases and covariant returns.
6424 Java classes are left unchanged because (void *) isn't a valid
6425 Java type, and we don't want to change the Java ABI. */
6426 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
6427 type = build_pointer_type (void_type_node);
6429 type = void_type_node;
6432 case sfk_conversion:
6433 if (type && !same_type_p (type, optype))
6434 error ("operator %qT declared to return %qT", optype, type);
6436 pedwarn ("return type specified for %<operator %T%>", optype);
6447 /* A variable or data member (whose unqualified name is IDENTIFIER)
6448 has been declared with the indicated TYPE. If the TYPE is not
6449 acceptable, issue an error message and return a type to use for
6450 error-recovery purposes. */
6453 check_var_type (tree identifier, tree type)
6455 if (VOID_TYPE_P (type))
6458 error ("unnamed variable or field declared void");
6459 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
6461 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
6462 error ("variable or field %qE declared void", identifier);
6465 error ("variable or field declared void");
6466 type = integer_type_node;
6472 /* Given declspecs and a declarator (abstract or otherwise), determine
6473 the name and type of the object declared and construct a DECL node
6476 DECLSPECS is a chain of tree_list nodes whose value fields
6477 are the storage classes and type specifiers.
6479 DECL_CONTEXT says which syntactic context this declaration is in:
6480 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
6481 FUNCDEF for a function definition. Like NORMAL but a few different
6482 error messages in each case. Return value may be zero meaning
6483 this definition is too screwy to try to parse.
6484 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
6485 handle member functions (which have FIELD context).
6486 Return value may be zero meaning this definition is too screwy to
6488 PARM for a parameter declaration (either within a function prototype
6489 or before a function body). Make a PARM_DECL, or return void_type_node.
6490 CATCHPARM for a parameter declaration before a catch clause.
6491 TYPENAME if for a typename (in a cast or sizeof).
6492 Don't make a DECL node; just return the ..._TYPE node.
6493 FIELD for a struct or union field; make a FIELD_DECL.
6494 BITFIELD for a field with specified width.
6495 INITIALIZED is 1 if the decl has an initializer.
6497 ATTRLIST is a pointer to the list of attributes, which may be NULL
6498 if there are none; *ATTRLIST may be modified if attributes from inside
6499 the declarator should be applied to the declaration.
6501 When this function is called, scoping variables (such as
6502 CURRENT_CLASS_TYPE) should reflect the scope in which the
6503 declaration occurs, not the scope in which the new declaration will
6504 be placed. For example, on:
6508 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
6509 should not be `S'. */
6512 grokdeclarator (const cp_declarator *declarator,
6513 const cp_decl_specifier_seq *declspecs,
6514 enum decl_context decl_context,
6518 tree type = NULL_TREE;
6521 int virtualp, explicitp, friendp, inlinep, staticp;
6522 int explicit_int = 0;
6523 int explicit_char = 0;
6524 int defaulted_int = 0;
6525 tree dependant_name = NULL_TREE;
6527 tree typedef_decl = NULL_TREE;
6528 const char *name = NULL;
6529 tree typedef_type = NULL_TREE;
6530 int funcdef_flag = 0;
6531 cp_declarator_kind innermost_code = cdk_error;
6534 /* See the code below that used this. */
6535 tree decl_attr = NULL_TREE;
6538 /* Keep track of what sort of function is being processed
6539 so that we can warn about default return values, or explicit
6540 return values which do not match prescribed defaults. */
6541 special_function_kind sfk = sfk_none;
6543 tree dname = NULL_TREE;
6544 tree ctor_return_type = NULL_TREE;
6545 enum overload_flags flags = NO_SPECIAL;
6546 cp_cv_quals quals = TYPE_UNQUALIFIED;
6547 tree raises = NULL_TREE;
6548 int template_count = 0;
6549 tree returned_attrs = NULL_TREE;
6550 tree parms = NULL_TREE;
6551 const cp_declarator *id_declarator;
6552 /* The unqualified name of the declarator; either an
6553 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
6554 tree unqualified_id;
6555 /* The class type, if any, in which this entity is located,
6556 or NULL_TREE if none. Note that this value may be different from
6557 the current class type; for example if an attempt is made to declare
6558 "A::f" inside "B", this value will be "A". */
6559 tree ctype = current_class_type;
6560 /* The NAMESPACE_DECL for the namespace in which this entity is
6561 located. If an unqualified name is used to declare the entity,
6562 this value will be NULL_TREE, even if the entity is located at
6564 tree in_namespace = NULL_TREE;
6566 cp_storage_class storage_class;
6567 bool unsigned_p, signed_p, short_p, long_p, thread_p;
6568 bool type_was_error_mark_node = false;
6570 signed_p = declspecs->specs[(int)ds_signed];
6571 unsigned_p = declspecs->specs[(int)ds_unsigned];
6572 short_p = declspecs->specs[(int)ds_short];
6573 long_p = declspecs->specs[(int)ds_long];
6574 thread_p = declspecs->specs[(int)ds_thread];
6576 if (decl_context == FUNCDEF)
6577 funcdef_flag = 1, decl_context = NORMAL;
6578 else if (decl_context == MEMFUNCDEF)
6579 funcdef_flag = -1, decl_context = FIELD;
6580 else if (decl_context == BITFIELD)
6581 bitfield = 1, decl_context = FIELD;
6583 /* Look inside a declarator for the name being declared
6584 and get it as a string, for an error message. */
6585 for (id_declarator = declarator;
6587 id_declarator = id_declarator->declarator)
6589 if (id_declarator->kind != cdk_id)
6590 innermost_code = id_declarator->kind;
6592 switch (id_declarator->kind)
6595 if (id_declarator->declarator
6596 && id_declarator->declarator->kind == cdk_id)
6598 sfk = id_declarator->declarator->u.id.sfk;
6599 if (sfk == sfk_destructor)
6606 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
6607 tree decl = id_declarator->u.id.unqualified_name;
6610 if (qualifying_scope)
6612 if (TYPE_P (qualifying_scope))
6614 ctype = qualifying_scope;
6615 if (innermost_code != cdk_function
6616 && current_class_type
6617 && !UNIQUELY_DERIVED_FROM_P (ctype,
6618 current_class_type))
6620 error ("type %qT is not derived from type %qT",
6621 ctype, current_class_type);
6622 return error_mark_node;
6625 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
6626 in_namespace = qualifying_scope;
6628 if (TREE_CODE (decl) == BASELINK)
6629 decl = BASELINK_FUNCTIONS (decl);
6630 if (decl == error_mark_node)
6631 return error_mark_node;
6632 switch (TREE_CODE (decl))
6638 if (innermost_code != cdk_function)
6640 error ("declaration of %qD as non-function", decl);
6641 return error_mark_node;
6643 else if (!qualifying_scope
6644 && !(current_class_type && at_class_scope_p ()))
6646 error ("declaration of %qD as non-member", decl);
6647 return error_mark_node;
6650 type = TREE_OPERAND (decl, 0);
6651 name = IDENTIFIER_POINTER (constructor_name (type));
6655 case TEMPLATE_ID_EXPR:
6657 tree fns = TREE_OPERAND (decl, 0);
6660 if (TREE_CODE (dname) == COMPONENT_REF)
6661 dname = TREE_OPERAND (dname, 1);
6662 if (TREE_CODE (dname) != IDENTIFIER_NODE)
6664 gcc_assert (is_overloaded_fn (dname));
6665 dname = DECL_NAME (get_first_fn (dname));
6670 case IDENTIFIER_NODE:
6671 if (TREE_CODE (decl) == IDENTIFIER_NODE)
6674 if (C_IS_RESERVED_WORD (dname))
6676 error ("declarator-id missing; using reserved word %qD",
6678 name = IDENTIFIER_POINTER (dname);
6680 else if (!IDENTIFIER_TYPENAME_P (dname))
6681 name = IDENTIFIER_POINTER (dname);
6684 gcc_assert (flags == NO_SPECIAL);
6685 flags = TYPENAME_FLAG;
6686 ctor_return_type = TREE_TYPE (dname);
6687 sfk = sfk_conversion;
6688 if (is_typename_at_global_scope (dname))
6689 name = IDENTIFIER_POINTER (dname);
6691 name = "<invalid operator>";
6696 dname = constructor_name (TREE_TYPE (decl));
6697 name = IDENTIFIER_POINTER (dname);
6718 if (id_declarator->kind == cdk_id)
6722 /* A function definition's declarator must have the form of
6723 a function declarator. */
6725 if (funcdef_flag && innermost_code != cdk_function)
6728 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
6729 && innermost_code != cdk_function
6730 && ! (ctype && !declspecs->any_specifiers_p))
6732 error ("declaration of %qD as non-function", dname);
6733 return error_mark_node;
6736 /* Anything declared one level down from the top level
6737 must be one of the parameters of a function
6738 (because the body is at least two levels down). */
6740 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
6741 by not allowing C++ class definitions to specify their parameters
6742 with xdecls (must be spec.d in the parmlist).
6744 Since we now wait to push a class scope until we are sure that
6745 we are in a legitimate method context, we must set oldcname
6746 explicitly (since current_class_name is not yet alive).
6748 We also want to avoid calling this a PARM if it is in a namespace. */
6750 if (decl_context == NORMAL && !toplevel_bindings_p ())
6752 struct cp_binding_level *b = current_binding_level;
6753 current_binding_level = b->level_chain;
6754 if (current_binding_level != 0 && toplevel_bindings_p ())
6755 decl_context = PARM;
6756 current_binding_level = b;
6760 name = decl_context == PARM ? "parameter" : "type name";
6762 /* If there were multiple types specified in the decl-specifier-seq,
6763 issue an error message. */
6764 if (declspecs->multiple_types_p)
6765 error ("two or more data types in declaration of %qs", name);
6766 /* Extract the basic type from the decl-specifier-seq. */
6767 type = declspecs->type;
6768 if (type == error_mark_node)
6771 type_was_error_mark_node = true;
6773 /* If the entire declaration is itself tagged as deprecated then
6774 suppress reports of deprecated items. */
6775 if (type && TREE_DEPRECATED (type)
6776 && deprecated_state != DEPRECATED_SUPPRESS)
6777 warn_deprecated_use (type);
6778 if (type && TREE_CODE (type) == TYPE_DECL)
6780 typedef_decl = type;
6781 type = TREE_TYPE (typedef_decl);
6783 /* No type at all: default to `int', and set DEFAULTED_INT
6784 because it was not a user-defined typedef. */
6785 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
6787 /* These imply 'int'. */
6788 type = integer_type_node;
6792 explicit_int = declspecs->explicit_int_p;
6793 explicit_char = declspecs->explicit_char_p;
6795 /* Check for repeated decl-specifiers. */
6796 for (ds = ds_first; ds != ds_last; ++ds)
6798 unsigned count = declspecs->specs[(int)ds];
6801 /* The "long" specifier is a special case because of
6806 error ("%<long long long%> is too long for GCC");
6807 else if (pedantic && !in_system_header && warn_long_long)
6808 pedwarn ("ISO C++ does not support %<long long%>");
6812 else if (declspecs->specs[(int)ds] > 1)
6814 static const char *const decl_spec_names[] = {
6830 error ("duplicate %qs", decl_spec_names[(int)ds]);
6835 /* See the code below that used this. */
6837 decl_attr = DECL_ATTRIBUTES (typedef_decl);
6839 typedef_type = type;
6842 if (sfk != sfk_conversion)
6843 ctor_return_type = ctype;
6845 if (sfk != sfk_none)
6846 type = check_special_function_return_type (sfk, type,
6848 else if (type == NULL_TREE)
6854 /* We handle `main' specially here, because 'main () { }' is so
6855 common. With no options, it is allowed. With -Wreturn-type,
6856 it is a warning. It is only an error with -pedantic-errors. */
6857 is_main = (funcdef_flag
6858 && dname && MAIN_NAME_P (dname)
6859 && ctype == NULL_TREE
6860 && in_namespace == NULL_TREE
6861 && current_namespace == global_namespace);
6863 if (type_was_error_mark_node)
6864 /* We've already issued an error, don't complain more. */;
6865 else if (in_system_header || flag_ms_extensions)
6866 /* Allow it, sigh. */;
6867 else if (pedantic || ! is_main)
6868 pedwarn ("ISO C++ forbids declaration of %qs with no type", name);
6869 else if (warn_return_type)
6870 warning (0, "ISO C++ forbids declaration of %qs with no type", name);
6872 type = integer_type_node;
6877 /* Now process the modifiers that were specified
6878 and check for invalid combinations. */
6880 /* Long double is a special combination. */
6881 if (long_p && TYPE_MAIN_VARIANT (type) == double_type_node)
6884 type = build_qualified_type (long_double_type_node,
6885 cp_type_quals (type));
6888 /* Check all other uses of type modifiers. */
6890 if (unsigned_p || signed_p || long_p || short_p)
6894 if (TREE_CODE (type) == REAL_TYPE)
6895 error ("short, signed or unsigned invalid for %qs", name);
6896 else if (TREE_CODE (type) != INTEGER_TYPE)
6897 error ("long, short, signed or unsigned invalid for %qs", name);
6898 else if (long_p && short_p)
6899 error ("long and short specified together for %qs", name);
6900 else if ((long_p || short_p) && explicit_char)
6901 error ("long or short specified with char for %qs", name);
6902 else if ((long_p|| short_p) && TREE_CODE (type) == REAL_TYPE)
6903 error ("long or short specified with floating type for %qs", name);
6904 else if (signed_p && unsigned_p)
6905 error ("signed and unsigned given together for %qs", name);
6909 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
6911 pedwarn ("long, short, signed or unsigned used invalidly for %qs",
6913 if (flag_pedantic_errors)
6918 /* Discard the type modifiers if they are invalid. */
6929 /* Decide whether an integer type is signed or not.
6930 Optionally treat bitfields as signed by default. */
6934 It is implementation-defined whether a plain (neither
6935 explicitly signed or unsigned) char, short, int, or long
6936 bit-field is signed or unsigned.
6938 Naturally, we extend this to long long as well. Note that
6939 this does not include wchar_t. */
6940 || (bitfield && !flag_signed_bitfields
6942 /* A typedef for plain `int' without `signed' can be
6943 controlled just like plain `int', but a typedef for
6944 `signed int' cannot be so controlled. */
6946 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
6947 && (TREE_CODE (type) == INTEGER_TYPE
6948 || TREE_CODE (type) == CHAR_TYPE)
6949 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
6952 type = long_long_unsigned_type_node;
6954 type = long_unsigned_type_node;
6956 type = short_unsigned_type_node;
6957 else if (type == char_type_node)
6958 type = unsigned_char_type_node;
6959 else if (typedef_decl)
6960 type = c_common_unsigned_type (type);
6962 type = unsigned_type_node;
6964 else if (signed_p && type == char_type_node)
6965 type = signed_char_type_node;
6967 type = long_long_integer_type_node;
6969 type = long_integer_type_node;
6971 type = short_integer_type_node;
6973 if (declspecs->specs[(int)ds_complex])
6975 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
6976 error ("complex invalid for %qs", name);
6977 /* If we just have "complex", it is equivalent to
6978 "complex double", but if any modifiers at all are specified it is
6979 the complex form of TYPE. E.g, "complex short" is
6980 "complex short int". */
6982 else if (defaulted_int && ! longlong
6983 && ! (long_p || short_p || signed_p || unsigned_p))
6984 type = complex_double_type_node;
6985 else if (type == integer_type_node)
6986 type = complex_integer_type_node;
6987 else if (type == float_type_node)
6988 type = complex_float_type_node;
6989 else if (type == double_type_node)
6990 type = complex_double_type_node;
6991 else if (type == long_double_type_node)
6992 type = complex_long_double_type_node;
6994 type = build_complex_type (type);
6997 type_quals = TYPE_UNQUALIFIED;
6998 if (declspecs->specs[(int)ds_const])
6999 type_quals |= TYPE_QUAL_CONST;
7000 if (declspecs->specs[(int)ds_volatile])
7001 type_quals |= TYPE_QUAL_VOLATILE;
7002 if (declspecs->specs[(int)ds_restrict])
7003 type_quals |= TYPE_QUAL_RESTRICT;
7004 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
7005 error ("qualifiers are not allowed on declaration of %<operator %T%>",
7008 if (TREE_CODE (type) == FUNCTION_TYPE
7009 && type_quals != TYPE_UNQUALIFIED)
7011 /* This was an error in C++98 (cv-qualifiers cannot be added to
7012 a function type), but DR 295 makes the code well-formed by
7013 dropping the extra qualifiers. */
7016 tree bad_type = build_qualified_type (type, type_quals);
7017 pedwarn ("ignoring %qV qualifiers added to function type %qT",
7020 type_quals = TYPE_UNQUALIFIED;
7022 type_quals |= cp_type_quals (type);
7023 type = cp_build_qualified_type_real
7024 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
7025 ? tf_ignore_bad_quals : 0) | tf_error | tf_warning));
7026 /* We might have ignored or rejected some of the qualifiers. */
7027 type_quals = cp_type_quals (type);
7030 inlinep = !! declspecs->specs[(int)ds_inline];
7031 virtualp = !! declspecs->specs[(int)ds_virtual];
7032 explicitp = !! declspecs->specs[(int)ds_explicit];
7034 storage_class = declspecs->storage_class;
7035 if (storage_class == sc_static)
7036 staticp = 1 + (decl_context == FIELD);
7038 if (virtualp && staticp == 2)
7040 error ("member %qD cannot be declared both virtual and static", dname);
7043 friendp = !! declspecs->specs[(int)ds_friend];
7045 if (dependant_name && !friendp)
7047 error ("%<%T::%D%> is not a valid declarator", ctype, dependant_name);
7048 return void_type_node;
7051 /* Issue errors about use of storage classes for parameters. */
7052 if (decl_context == PARM)
7054 if (declspecs->specs[(int)ds_typedef])
7055 error ("typedef declaration invalid in parameter declaration");
7056 else if (storage_class == sc_static
7057 || storage_class == sc_extern
7059 error ("storage class specifiers invalid in parameter declarations");
7062 /* Give error if `virtual' is used outside of class declaration. */
7064 && (current_class_name == NULL_TREE || decl_context != FIELD))
7066 error ("virtual outside class declaration");
7070 /* Static anonymous unions are dealt with here. */
7071 if (staticp && decl_context == TYPENAME
7073 && ANON_AGGR_TYPE_P (declspecs->type))
7074 decl_context = FIELD;
7076 /* Warn about storage classes that are invalid for certain
7077 kinds of declarations (parameters, typenames, etc.). */
7078 if (declspecs->multiple_storage_classes_p)
7080 error ("multiple storage classes in declaration of %qs", name);
7081 storage_class = sc_none;
7085 && storage_class != sc_extern
7086 && storage_class != sc_static)
7087 || declspecs->specs[(int)ds_typedef]))
7089 error ("multiple storage classes in declaration of %qs", name);
7092 else if (decl_context != NORMAL
7093 && ((storage_class != sc_none
7094 && storage_class != sc_mutable)
7097 if ((decl_context == PARM || decl_context == CATCHPARM)
7098 && (storage_class == sc_register
7099 || storage_class == sc_auto))
7101 else if (declspecs->specs[(int)ds_typedef])
7103 else if (decl_context == FIELD
7104 /* C++ allows static class elements. */
7105 && storage_class == sc_static)
7106 /* C++ also allows inlines and signed and unsigned elements,
7107 but in those cases we don't come in here. */
7111 if (decl_context == FIELD)
7112 error ("storage class specified for %qs", name);
7115 if (decl_context == PARM || decl_context == CATCHPARM)
7116 error ("storage class specified for parameter %qs", name);
7118 error ("storage class specified for typename");
7120 if (storage_class == sc_register
7121 || storage_class == sc_auto
7122 || storage_class == sc_extern
7124 storage_class = sc_none;
7127 else if (storage_class == sc_extern && initialized
7130 if (toplevel_bindings_p ())
7132 /* It's common practice (and completely valid) to have a const
7133 be initialized and declared extern. */
7134 if (!(type_quals & TYPE_QUAL_CONST))
7135 warning (0, "%qs initialized and declared %<extern%>", name);
7138 error ("%qs has both %<extern%> and initializer", name);
7140 else if (storage_class == sc_extern && funcdef_flag
7141 && ! toplevel_bindings_p ())
7142 error ("nested function %qs declared %<extern%>", name);
7143 else if (toplevel_bindings_p ())
7145 if (storage_class == sc_auto)
7146 error ("top-level declaration of %qs specifies %<auto%>", name);
7149 && storage_class != sc_extern
7150 && storage_class != sc_static)
7152 error ("function-scope %qs implicitly auto and declared %<__thread%>",
7157 if (storage_class && friendp)
7158 error ("storage class specifiers invalid in friend function declarations");
7161 unqualified_id = NULL_TREE;
7164 unqualified_id = id_declarator->u.id.unqualified_name;
7165 if (TREE_CODE (unqualified_id) == BASELINK)
7166 unqualified_id = BASELINK_FUNCTIONS (unqualified_id);
7167 switch (TREE_CODE (unqualified_id))
7171 = constructor_name (TREE_OPERAND (unqualified_id, 0));
7176 = constructor_name (TREE_TYPE (unqualified_id));
7179 case IDENTIFIER_NODE:
7180 case TEMPLATE_ID_EXPR:
7188 /* Determine the type of the entity declared by recurring on the
7190 for (; declarator; declarator = declarator->declarator)
7192 const cp_declarator *inner_declarator;
7195 if (type == error_mark_node)
7196 return error_mark_node;
7198 attrs = declarator->attributes;
7204 if (declarator == NULL || declarator->kind == cdk_id)
7205 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
7206 if (declarator->kind == cdk_function)
7207 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
7208 if (declarator->kind == cdk_array)
7209 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
7210 returned_attrs = decl_attributes (&type,
7211 chainon (returned_attrs, attrs),
7215 if (declarator->kind == cdk_id)
7218 inner_declarator = declarator->declarator;
7220 switch (declarator->kind)
7223 type = create_array_type_for_decl (dname, type,
7224 declarator->u.array.bounds);
7232 /* Declaring a function type.
7233 Make sure we have a valid type for the function to return. */
7235 /* We now know that the TYPE_QUALS don't apply to the
7236 decl, but to its return type. */
7237 type_quals = TYPE_UNQUALIFIED;
7239 /* Warn about some types functions can't return. */
7241 if (TREE_CODE (type) == FUNCTION_TYPE)
7243 error ("%qs declared as function returning a function", name);
7244 type = integer_type_node;
7246 if (TREE_CODE (type) == ARRAY_TYPE)
7248 error ("%qs declared as function returning an array", name);
7249 type = integer_type_node;
7252 /* Pick up type qualifiers which should be applied to `this'. */
7253 quals = declarator->u.function.qualifiers;
7255 /* Pick up the exception specifications. */
7256 raises = declarator->u.function.exception_specification;
7258 /* Say it's a definition only for the CALL_EXPR
7259 closest to the identifier. */
7260 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
7262 if (ctype == NULL_TREE
7263 && decl_context == FIELD
7265 && (friendp == 0 || dname == current_class_name))
7266 ctype = current_class_type;
7268 if (ctype && sfk == sfk_conversion)
7269 TYPE_HAS_CONVERSION (ctype) = 1;
7270 if (ctype && (sfk == sfk_constructor
7271 || sfk == sfk_destructor))
7273 /* We are within a class's scope. If our declarator name
7274 is the same as the class name, and we are defining
7275 a function, then it is a constructor/destructor, and
7276 therefore returns a void type. */
7278 if (flags == DTOR_FLAG)
7280 /* ISO C++ 12.4/2. A destructor may not be
7281 declared const or volatile. A destructor may
7284 error ("destructor cannot be static member function");
7287 error ("destructors may not be cv-qualified");
7288 quals = TYPE_UNQUALIFIED;
7290 if (decl_context == FIELD)
7292 if (! member_function_or_else (ctype,
7295 return void_type_node;
7298 else /* It's a constructor. */
7302 /* ISO C++ 12.1. A constructor may not be
7303 declared const or volatile. A constructor may
7304 not be virtual. A constructor may not be
7307 error ("constructor cannot be static member function");
7310 pedwarn ("constructors cannot be declared virtual");
7315 error ("constructors may not be cv-qualified");
7316 quals = TYPE_UNQUALIFIED;
7318 if (decl_context == FIELD)
7320 if (! member_function_or_else (ctype,
7323 return void_type_node;
7324 TYPE_HAS_CONSTRUCTOR (ctype) = 1;
7325 if (sfk != sfk_constructor)
7329 if (decl_context == FIELD)
7335 error ("can't initialize friend function %qs", name);
7338 /* Cannot be both friend and virtual. */
7339 error ("virtual functions cannot be friends");
7342 if (decl_context == NORMAL)
7343 error ("friend declaration not in class definition");
7344 if (current_function_decl && funcdef_flag)
7345 error ("can't define friend function %qs in a local "
7350 arg_types = grokparms (declarator->u.function.parameters,
7353 if (inner_declarator
7354 && inner_declarator->kind == cdk_id
7355 && inner_declarator->u.id.sfk == sfk_destructor
7356 && arg_types != void_list_node)
7358 error ("destructors may not have parameters");
7359 arg_types = void_list_node;
7363 type = build_function_type (type, arg_types);
7364 type = cp_build_qualified_type (type, quals);
7371 /* Filter out pointers-to-references and references-to-references.
7372 We can get these if a TYPE_DECL is used. */
7374 if (TREE_CODE (type) == REFERENCE_TYPE)
7376 error (declarator->kind == cdk_reference
7377 ? "cannot declare reference to %q#T"
7378 : "cannot declare pointer to %q#T", type);
7379 type = TREE_TYPE (type);
7381 else if (VOID_TYPE_P (type))
7383 if (declarator->kind == cdk_reference)
7384 error ("cannot declare reference to %q#T", type);
7385 else if (declarator->kind == cdk_ptrmem)
7386 error ("cannot declare pointer to %q#T member", type);
7389 /* We now know that the TYPE_QUALS don't apply to the decl,
7390 but to the target of the pointer. */
7391 type_quals = TYPE_UNQUALIFIED;
7393 if (declarator->kind == cdk_ptrmem
7394 && (TREE_CODE (type) == FUNCTION_TYPE
7395 || (quals && TREE_CODE (type) == METHOD_TYPE)))
7399 /* If the type is a FUNCTION_TYPE, pick up the
7400 qualifiers from that function type. No other
7401 qualifiers may be supplied. */
7402 if (TREE_CODE (type) == FUNCTION_TYPE)
7403 quals = cp_type_quals (type);
7405 dummy = build_decl (TYPE_DECL, NULL_TREE, type);
7406 grok_method_quals (declarator->u.pointer.class_type,
7408 type = TREE_TYPE (dummy);
7409 quals = TYPE_UNQUALIFIED;
7412 if (declarator->kind == cdk_reference)
7414 if (!VOID_TYPE_P (type))
7415 type = build_reference_type (type);
7417 else if (TREE_CODE (type) == METHOD_TYPE)
7418 type = build_ptrmemfunc_type (build_pointer_type (type));
7419 else if (declarator->kind == cdk_ptrmem)
7421 /* We might have parsed a namespace as the class type. */
7422 if (TREE_CODE (declarator->u.pointer.class_type)
7425 error ("%qD is a namespace",
7426 declarator->u.pointer.class_type);
7427 type = build_pointer_type (type);
7429 else if (declarator->u.pointer.class_type == error_mark_node)
7430 /* We will already have complained. */
7431 type = error_mark_node;
7433 type = build_ptrmem_type (declarator->u.pointer.class_type,
7437 type = build_pointer_type (type);
7439 /* Process a list of type modifier keywords (such as
7440 const or volatile) that were given inside the `*' or `&'. */
7442 if (declarator->u.pointer.qualifiers)
7445 = cp_build_qualified_type (type,
7446 declarator->u.pointer.qualifiers);
7447 type_quals = cp_type_quals (type);
7460 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
7461 && TREE_CODE (type) != FUNCTION_TYPE
7462 && TREE_CODE (type) != METHOD_TYPE)
7464 error ("template-id %qD used as a declarator",
7466 unqualified_id = dname;
7469 /* If DECLARATOR is non-NULL, we know it is a cdk_id declarator;
7470 otherwise, we would not have exited the loop above. */
7472 && declarator->u.id.qualifying_scope
7473 && TYPE_P (declarator->u.id.qualifying_scope))
7477 ctype = declarator->u.id.qualifying_scope;
7478 ctype = TYPE_MAIN_VARIANT (ctype);
7480 while (t != NULL_TREE && CLASS_TYPE_P (t))
7482 /* You're supposed to have one `template <...>' for every
7483 template class, but you don't need one for a full
7484 specialization. For example:
7486 template <class T> struct S{};
7487 template <> struct S<int> { void f(); };
7488 void S<int>::f () {}
7490 is correct; there shouldn't be a `template <>' for the
7491 definition of `S<int>::f'. */
7492 if (CLASSTYPE_TEMPLATE_INFO (t)
7493 && (CLASSTYPE_TEMPLATE_INSTANTIATION (t)
7494 || uses_template_parms (CLASSTYPE_TI_ARGS (t)))
7495 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
7496 template_count += 1;
7498 t = TYPE_MAIN_DECL (t);
7499 t = DECL_CONTEXT (t);
7502 if (ctype == current_class_type)
7508 Is this ill-formed? */
7511 pedwarn ("extra qualification %<%T::%> on member %qs ignored",
7514 else if (TREE_CODE (type) == FUNCTION_TYPE)
7516 tree sname = declarator->u.id.unqualified_name;
7518 if (TREE_CODE (sname) == IDENTIFIER_NODE
7519 && NEW_DELETE_OPNAME_P (sname))
7520 /* Overloaded operator new and operator delete
7521 are always static functions. */
7523 else if (current_class_type == NULL_TREE || friendp)
7525 = build_method_type_directly (ctype,
7527 TYPE_ARG_TYPES (type));
7530 error ("cannot declare member function %<%T::%s%> within %<%T%>",
7531 ctype, name, current_class_type);
7532 return error_mark_node;
7535 else if (declspecs->specs[(int)ds_typedef]
7536 || COMPLETE_TYPE_P (complete_type (ctype)))
7538 /* Have to move this code elsewhere in this function.
7539 this code is used for i.e., typedef int A::M; M *pm;
7541 It is? How? jason 10/2/94 */
7543 if (current_class_type)
7545 error ("cannot declare member %<%T::%s%> within %qT",
7546 ctype, name, current_class_type);
7547 return void_type_node;
7552 cxx_incomplete_type_error (NULL_TREE, ctype);
7553 return error_mark_node;
7560 *attrlist = chainon (returned_attrs, *attrlist);
7562 attrlist = &returned_attrs;
7565 /* Now TYPE has the actual type. */
7567 /* Did array size calculations overflow? */
7569 if (TREE_CODE (type) == ARRAY_TYPE
7570 && COMPLETE_TYPE_P (type)
7571 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
7572 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
7574 error ("size of array %qs is too large", name);
7575 /* If we proceed with the array type as it is, we'll eventually
7576 crash in tree_low_cst(). */
7577 type = error_mark_node;
7580 if ((decl_context == FIELD || decl_context == PARM)
7581 && !processing_template_decl
7582 && variably_modified_type_p (type, NULL_TREE))
7584 if (decl_context == FIELD)
7585 error ("data member may not have variably modified type %qT", type);
7587 error ("parameter may not have variably modified type %qT", type);
7588 type = error_mark_node;
7591 if (explicitp == 1 || (explicitp && friendp))
7593 /* [dcl.fct.spec] The explicit specifier shall only be used in
7594 declarations of constructors within a class definition. */
7595 error ("only declarations of constructors can be %<explicit%>");
7599 if (storage_class == sc_mutable)
7601 if (decl_context != FIELD || friendp)
7603 error ("non-member %qs cannot be declared %<mutable%>", name);
7604 storage_class = sc_none;
7606 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
7608 error ("non-object member %qs cannot be declared %<mutable%>", name);
7609 storage_class = sc_none;
7611 else if (TREE_CODE (type) == FUNCTION_TYPE
7612 || TREE_CODE (type) == METHOD_TYPE)
7614 error ("function %qs cannot be declared %<mutable%>", name);
7615 storage_class = sc_none;
7619 error ("static %qs cannot be declared %<mutable%>", name);
7620 storage_class = sc_none;
7622 else if (type_quals & TYPE_QUAL_CONST)
7624 error ("const %qs cannot be declared %<mutable%>", name);
7625 storage_class = sc_none;
7629 /* If this is declaring a typedef name, return a TYPE_DECL. */
7630 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
7634 /* Note that the grammar rejects storage classes
7635 in typenames, fields or parameters. */
7636 if (current_lang_name == lang_name_java)
7637 TYPE_FOR_JAVA (type) = 1;
7639 if (decl_context == FIELD)
7640 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
7642 decl = build_decl (TYPE_DECL, unqualified_id, type);
7643 if (id_declarator && declarator->u.id.qualifying_scope)
7644 error ("%Jtypedef name may not be a nested-name-specifier", decl);
7646 if (decl_context != FIELD)
7648 if (!current_function_decl)
7649 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
7650 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
7651 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
7652 (current_function_decl)))
7653 /* The TYPE_DECL is "abstract" because there will be
7654 clones of this constructor/destructor, and there will
7655 be copies of this TYPE_DECL generated in those
7657 DECL_ABSTRACT (decl) = 1;
7659 else if (constructor_name_p (unqualified_id, current_class_type))
7660 pedwarn ("ISO C++ forbids nested type %qD with same name "
7661 "as enclosing class",
7664 /* If the user declares "typedef struct {...} foo" then the
7665 struct will have an anonymous name. Fill that name in now.
7666 Nothing can refer to it, so nothing needs know about the name
7668 if (type != error_mark_node
7671 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
7672 && TYPE_ANONYMOUS_P (type)
7673 /* Don't do this if there are attributes. */
7674 && (!attrlist || !*attrlist)
7675 && cp_type_quals (type) == TYPE_UNQUALIFIED)
7677 tree oldname = TYPE_NAME (type);
7680 /* Replace the anonymous name with the real name everywhere. */
7681 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
7682 if (TYPE_NAME (t) == oldname)
7683 TYPE_NAME (t) = decl;
7685 if (TYPE_LANG_SPECIFIC (type))
7686 TYPE_WAS_ANONYMOUS (type) = 1;
7688 /* If this is a typedef within a template class, the nested
7689 type is a (non-primary) template. The name for the
7690 template needs updating as well. */
7691 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
7692 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
7693 = TYPE_IDENTIFIER (type);
7695 /* FIXME remangle member functions; member functions of a
7696 type with external linkage have external linkage. */
7701 if (ctype == NULL_TREE)
7703 if (TREE_CODE (type) == METHOD_TYPE)
7704 ctype = TYPE_METHOD_BASETYPE (type);
7705 /* Any qualifiers on a function type typedef have
7706 already been dealt with. */
7707 else if (TREE_CODE (type) == FUNCTION_TYPE)
7708 quals = TYPE_UNQUALIFIED;
7710 if (ctype != NULL_TREE)
7711 grok_method_quals (ctype, decl, quals);
7715 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
7716 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
7718 bad_specifiers (decl, "type", virtualp, quals != TYPE_UNQUALIFIED,
7719 inlinep, friendp, raises != NULL_TREE);
7724 /* Detect the case of an array type of unspecified size
7725 which came, as such, direct from a typedef name.
7726 We must copy the type, so that the array's domain can be
7727 individually set by the object's initializer. */
7729 if (type && typedef_type
7730 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
7731 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
7732 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
7734 /* Detect where we're using a typedef of function type to declare a
7735 function. PARMS will not be set, so we must create it now. */
7737 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
7739 tree decls = NULL_TREE;
7742 for (args = TYPE_ARG_TYPES (type); args; args = TREE_CHAIN (args))
7744 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
7746 TREE_CHAIN (decl) = decls;
7750 parms = nreverse (decls);
7752 if (decl_context != TYPENAME)
7754 /* A cv-qualifier-seq shall only be part of the function type
7755 for a non-static member function. [8.3.5/4 dcl.fct] */
7756 if (cp_type_quals (type) != TYPE_UNQUALIFIED
7757 && (current_class_type == NULL_TREE || staticp) )
7759 error ("qualified function types cannot be used to declare %s functions",
7760 (staticp? "static member" : "free"));
7761 type = TYPE_MAIN_VARIANT (type);
7764 /* The qualifiers on the function type become the qualifiers on
7765 the non-static member function. */
7766 quals |= cp_type_quals (type);
7770 /* If this is a type name (such as, in a cast or sizeof),
7771 compute the type and return it now. */
7773 if (decl_context == TYPENAME)
7775 /* Note that the grammar rejects storage classes
7776 in typenames, fields or parameters. */
7777 if (type_quals != TYPE_UNQUALIFIED)
7778 type_quals = TYPE_UNQUALIFIED;
7780 /* Special case: "friend class foo" looks like a TYPENAME context. */
7783 if (type_quals != TYPE_UNQUALIFIED)
7785 error ("type qualifiers specified for friend class declaration");
7786 type_quals = TYPE_UNQUALIFIED;
7790 error ("%<inline%> specified for friend class declaration");
7796 /* Don't allow friend declaration without a class-key. */
7797 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
7798 pedwarn ("template parameters cannot be friends");
7799 else if (TREE_CODE (type) == TYPENAME_TYPE)
7800 pedwarn ("friend declaration requires class-key, "
7801 "i.e. %<friend class %T::%D%>",
7802 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
7804 pedwarn ("friend declaration requires class-key, "
7805 "i.e. %<friend %#T%>",
7809 /* Only try to do this stuff if we didn't already give up. */
7810 if (type != integer_type_node)
7812 /* A friendly class? */
7813 if (current_class_type)
7814 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
7817 error ("trying to make class %qT a friend of global scope",
7820 type = void_type_node;
7825 if (ctype == NULL_TREE)
7827 if (TREE_CODE (type) != METHOD_TYPE)
7828 error ("invalid qualifiers on non-member function type");
7830 ctype = TYPE_METHOD_BASETYPE (type);
7834 tree dummy = build_decl (TYPE_DECL, unqualified_id, type);
7835 grok_method_quals (ctype, dummy, quals);
7836 type = TREE_TYPE (dummy);
7842 else if (unqualified_id == NULL_TREE && decl_context != PARM
7843 && decl_context != CATCHPARM
7844 && TREE_CODE (type) != UNION_TYPE
7847 error ("abstract declarator %qT used as declaration", type);
7848 return error_mark_node;
7851 /* Only functions may be declared using an operator-function-id. */
7853 && IDENTIFIER_OPNAME_P (unqualified_id)
7854 && TREE_CODE (type) != FUNCTION_TYPE
7855 && TREE_CODE (type) != METHOD_TYPE)
7857 error ("declaration of %qD as non-function", unqualified_id);
7858 return error_mark_node;
7861 /* We don't check parameter types here because we can emit a better
7862 error message later. */
7863 if (decl_context != PARM)
7864 type = check_var_type (unqualified_id, type);
7866 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
7867 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
7869 if (decl_context == PARM || decl_context == CATCHPARM)
7871 if (ctype || in_namespace)
7872 error ("cannot use %<::%> in parameter declaration");
7874 /* A parameter declared as an array of T is really a pointer to T.
7875 One declared as a function is really a pointer to a function.
7876 One declared as a member is really a pointer to member. */
7878 if (TREE_CODE (type) == ARRAY_TYPE)
7880 /* Transfer const-ness of array into that of type pointed to. */
7881 type = build_pointer_type (TREE_TYPE (type));
7882 type_quals = TYPE_UNQUALIFIED;
7884 else if (TREE_CODE (type) == FUNCTION_TYPE)
7885 type = build_pointer_type (type);
7891 if (decl_context == PARM)
7893 decl = cp_build_parm_decl (unqualified_id, type);
7895 bad_specifiers (decl, "parameter", virtualp, quals != TYPE_UNQUALIFIED,
7896 inlinep, friendp, raises != NULL_TREE);
7898 else if (decl_context == FIELD)
7900 /* The C99 flexible array extension. */
7901 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
7902 && TYPE_DOMAIN (type) == NULL_TREE)
7904 tree itype = compute_array_index_type (dname, integer_zero_node);
7905 type = build_cplus_array_type (TREE_TYPE (type), itype);
7908 if (type == error_mark_node)
7910 /* Happens when declaring arrays of sizes which
7911 are error_mark_node, for example. */
7914 else if (in_namespace && !friendp)
7916 /* Something like struct S { int N::j; }; */
7917 error ("invalid use of %<::%>");
7920 else if (TREE_CODE (type) == FUNCTION_TYPE)
7923 tree function_context;
7927 if (ctype == NULL_TREE)
7928 ctype = current_class_type;
7930 if (ctype == NULL_TREE)
7932 error ("can't make %qD into a method -- not in a class",
7934 return void_type_node;
7937 /* ``A union may [ ... ] not [ have ] virtual functions.''
7939 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
7941 error ("function %qD declared virtual inside a union",
7943 return void_type_node;
7946 if (NEW_DELETE_OPNAME_P (unqualified_id))
7950 error ("%qD cannot be declared virtual, since it "
7956 else if (staticp < 2)
7957 type = build_method_type_directly (ctype,
7959 TYPE_ARG_TYPES (type));
7962 /* Check that the name used for a destructor makes sense. */
7963 if (sfk == sfk_destructor
7964 && !same_type_p (TREE_OPERAND
7965 (id_declarator->u.id.unqualified_name, 0),
7968 error ("declaration of %qD as member of %qT",
7969 id_declarator->u.id.unqualified_name,
7971 return error_mark_node;
7974 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
7975 function_context = (ctype != NULL_TREE) ?
7976 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
7977 publicp = (! friendp || ! staticp)
7978 && function_context == NULL_TREE;
7979 decl = grokfndecl (ctype, type,
7980 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
7981 ? unqualified_id : dname,
7984 virtualp, flags, quals, raises,
7985 friendp ? -1 : 0, friendp, publicp, inlinep,
7987 funcdef_flag, template_count, in_namespace, attrlist);
7988 if (decl == NULL_TREE)
7991 /* This clobbers the attrs stored in `decl' from `attrlist'. */
7992 /* The decl and setting of decl_attr is also turned off. */
7993 decl = build_decl_attribute_variant (decl, decl_attr);
7996 /* [class.conv.ctor]
7998 A constructor declared without the function-specifier
7999 explicit that can be called with a single parameter
8000 specifies a conversion from the type of its first
8001 parameter to the type of its class. Such a constructor
8002 is called a converting constructor. */
8004 DECL_NONCONVERTING_P (decl) = 1;
8005 else if (DECL_CONSTRUCTOR_P (decl))
8007 /* The constructor can be called with exactly one
8008 parameter if there is at least one parameter, and
8009 any subsequent parameters have default arguments.
8010 Ignore any compiler-added parms. */
8011 tree arg_types = FUNCTION_FIRST_USER_PARMTYPE (decl);
8013 if (arg_types == void_list_node
8015 && TREE_CHAIN (arg_types)
8016 && TREE_CHAIN (arg_types) != void_list_node
8017 && !TREE_PURPOSE (TREE_CHAIN (arg_types))))
8018 DECL_NONCONVERTING_P (decl) = 1;
8021 else if (TREE_CODE (type) == METHOD_TYPE)
8023 /* We only get here for friend declarations of
8024 members of other classes. */
8025 /* All method decls are public, so tell grokfndecl to set
8026 TREE_PUBLIC, also. */
8027 decl = grokfndecl (ctype, type,
8028 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
8029 ? unqualified_id : dname,
8032 virtualp, flags, quals, raises,
8033 friendp ? -1 : 0, friendp, 1, 0, sfk,
8034 funcdef_flag, template_count, in_namespace,
8036 if (decl == NULL_TREE)
8039 else if (!staticp && !dependent_type_p (type)
8040 && !COMPLETE_TYPE_P (complete_type (type))
8041 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
8044 error ("field %qD has incomplete type", unqualified_id);
8046 error ("name %qT has incomplete type", type);
8048 /* If we're instantiating a template, tell them which
8049 instantiation made the field's type be incomplete. */
8050 if (current_class_type
8051 && TYPE_NAME (current_class_type)
8052 && IDENTIFIER_TEMPLATE (TYPE_IDENTIFIER (current_class_type))
8054 && declspecs->type == type)
8055 error (" in instantiation of template %qT",
8056 current_class_type);
8058 type = error_mark_node;
8065 error ("%qE is neither function nor member function; "
8066 "cannot be declared friend", unqualified_id);
8074 /* Friends are treated specially. */
8075 if (ctype == current_class_type)
8076 warning (0, "member functions are implicitly friends of their class");
8077 else if (decl && DECL_NAME (decl))
8079 if (template_class_depth (current_class_type) == 0)
8081 decl = check_explicit_specialization
8082 (unqualified_id, decl, template_count,
8083 2 * (funcdef_flag != 0) + 4);
8084 if (decl == error_mark_node)
8085 return error_mark_node;
8088 decl = do_friend (ctype, unqualified_id, decl,
8089 *attrlist, flags, quals, funcdef_flag);
8093 return void_type_node;
8096 /* Structure field. It may not be a function, except for C++. */
8098 if (decl == NULL_TREE)
8104 /* An attempt is being made to initialize a non-static
8105 member. But, from [class.mem]:
8107 4 A member-declarator can contain a
8108 constant-initializer only if it declares a static
8109 member (_class.static_) of integral or enumeration
8110 type, see _class.static.data_.
8112 This used to be relatively common practice, but
8113 the rest of the compiler does not correctly
8114 handle the initialization unless the member is
8115 static so we make it static below. */
8116 pedwarn ("ISO C++ forbids initialization of member %qD",
8118 pedwarn ("making %qD static", unqualified_id);
8122 if (uses_template_parms (type))
8123 /* We'll check at instantiation time. */
8125 else if (check_static_variable_definition (unqualified_id,
8127 /* If we just return the declaration, crashes
8128 will sometimes occur. We therefore return
8129 void_type_node, as if this was a friend
8130 declaration, to cause callers to completely
8131 ignore this declaration. */
8132 return void_type_node;
8137 /* C++ allows static class members. All other work
8138 for this is done by grokfield. */
8139 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
8140 set_linkage_for_static_data_member (decl);
8141 /* Even if there is an in-class initialization, DECL
8142 is considered undefined until an out-of-class
8143 definition is provided. */
8144 DECL_EXTERNAL (decl) = 1;
8148 decl = build_decl (FIELD_DECL, unqualified_id, type);
8149 DECL_NONADDRESSABLE_P (decl) = bitfield;
8150 if (storage_class == sc_mutable)
8152 DECL_MUTABLE_P (decl) = 1;
8153 storage_class = sc_none;
8157 bad_specifiers (decl, "field", virtualp, quals != TYPE_UNQUALIFIED,
8158 inlinep, friendp, raises != NULL_TREE);
8161 else if (TREE_CODE (type) == FUNCTION_TYPE
8162 || TREE_CODE (type) == METHOD_TYPE)
8167 if (!unqualified_id)
8170 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
8171 original_name = dname;
8173 original_name = unqualified_id;
8175 if (storage_class == sc_auto)
8176 error ("storage class %<auto%> invalid for function %qs", name);
8177 else if (storage_class == sc_register)
8178 error ("storage class %<register%> invalid for function %qs", name);
8180 error ("storage class %<__thread%> invalid for function %qs", name);
8182 /* Function declaration not at top level.
8183 Storage classes other than `extern' are not allowed
8184 and `extern' makes no difference. */
8185 if (! toplevel_bindings_p ()
8186 && (storage_class == sc_static
8187 || declspecs->specs[(int)ds_inline])
8190 if (storage_class == sc_static)
8191 pedwarn ("%<static%> specified invalid for function %qs "
8192 "declared out of global scope", name);
8194 pedwarn ("%<inline%> specifier invalid for function %qs "
8195 "declared out of global scope", name);
8198 if (ctype == NULL_TREE)
8202 error ("virtual non-class function %qs", name);
8206 else if (TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
8207 && !NEW_DELETE_OPNAME_P (original_name))
8208 type = build_method_type_directly (ctype,
8210 TYPE_ARG_TYPES (type));
8212 /* Record presence of `static'. */
8213 publicp = (ctype != NULL_TREE
8214 || storage_class == sc_extern
8215 || storage_class != sc_static);
8217 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
8218 virtualp, flags, quals, raises,
8220 publicp, inlinep, sfk, funcdef_flag,
8221 template_count, in_namespace, attrlist);
8222 if (decl == NULL_TREE)
8227 int invalid_static = 0;
8229 /* Don't allow a static member function in a class, and forbid
8230 declaring main to be static. */
8231 if (TREE_CODE (type) == METHOD_TYPE)
8233 pedwarn ("cannot declare member function %qD to have "
8234 "static linkage", decl);
8237 else if (current_function_decl)
8239 /* FIXME need arm citation */
8240 error ("cannot declare static function inside another function");
8247 storage_class = sc_none;
8253 /* It's a variable. */
8255 /* An uninitialized decl with `extern' is a reference. */
8256 decl = grokvardecl (type, unqualified_id,
8259 (type_quals & TYPE_QUAL_CONST) != 0,
8260 ctype ? ctype : in_namespace);
8261 bad_specifiers (decl, "variable", virtualp, quals != TYPE_UNQUALIFIED,
8262 inlinep, friendp, raises != NULL_TREE);
8266 DECL_CONTEXT (decl) = ctype;
8269 pedwarn ("%<static%> may not be used when defining "
8270 "(as opposed to declaring) a static data member");
8272 storage_class = sc_none;
8274 if (storage_class == sc_register && TREE_STATIC (decl))
8276 error ("static member %qD declared %<register%>", decl);
8277 storage_class = sc_none;
8279 if (storage_class == sc_extern && pedantic)
8281 pedwarn ("cannot explicitly declare member %q#D to have "
8284 storage_class = sc_none;
8289 /* Record `register' declaration for warnings on &
8290 and in case doing stupid register allocation. */
8292 if (storage_class == sc_register)
8293 DECL_REGISTER (decl) = 1;
8294 else if (storage_class == sc_extern)
8295 DECL_THIS_EXTERN (decl) = 1;
8296 else if (storage_class == sc_static)
8297 DECL_THIS_STATIC (decl) = 1;
8299 /* Record constancy and volatility. There's no need to do this
8300 when processing a template; we'll do this for the instantiated
8301 declaration based on the type of DECL. */
8302 if (!processing_template_decl)
8303 cp_apply_type_quals_to_decl (type_quals, decl);
8309 /* Subroutine of start_function. Ensure that each of the parameter
8310 types (as listed in PARMS) is complete, as is required for a
8311 function definition. */
8314 require_complete_types_for_parms (tree parms)
8316 for (; parms; parms = TREE_CHAIN (parms))
8318 if (dependent_type_p (TREE_TYPE (parms)))
8320 if (!VOID_TYPE_P (TREE_TYPE (parms))
8321 && complete_type_or_else (TREE_TYPE (parms), parms))
8323 relayout_decl (parms);
8324 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
8327 /* grokparms or complete_type_or_else will have already issued
8329 TREE_TYPE (parms) = error_mark_node;
8333 /* Returns nonzero if T is a local variable. */
8336 local_variable_p (tree t)
8338 if ((TREE_CODE (t) == VAR_DECL
8339 /* A VAR_DECL with a context that is a _TYPE is a static data
8341 && !TYPE_P (CP_DECL_CONTEXT (t))
8342 /* Any other non-local variable must be at namespace scope. */
8343 && !DECL_NAMESPACE_SCOPE_P (t))
8344 || (TREE_CODE (t) == PARM_DECL))
8350 /* Returns nonzero if T is an automatic local variable or a label.
8351 (These are the declarations that need to be remapped when the code
8352 containing them is duplicated.) */
8355 nonstatic_local_decl_p (tree t)
8357 return ((local_variable_p (t) && !TREE_STATIC (t))
8358 || TREE_CODE (t) == LABEL_DECL
8359 || TREE_CODE (t) == RESULT_DECL);
8362 /* Like local_variable_p, but suitable for use as a tree-walking
8366 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
8367 void *data ATTRIBUTE_UNUSED)
8369 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
8371 else if (TYPE_P (*tp))
8378 /* Check that ARG, which is a default-argument expression for a
8379 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
8380 something goes wrong. DECL may also be a _TYPE node, rather than a
8381 DECL, if there is no DECL available. */
8384 check_default_argument (tree decl, tree arg)
8389 if (TREE_CODE (arg) == DEFAULT_ARG)
8390 /* We get a DEFAULT_ARG when looking at an in-class declaration
8391 with a default argument. Ignore the argument for now; we'll
8392 deal with it after the class is complete. */
8395 if (processing_template_decl || uses_template_parms (arg))
8396 /* We don't do anything checking until instantiation-time. Note
8397 that there may be uninstantiated arguments even for an
8398 instantiated function, since default arguments are not
8399 instantiated until they are needed. */
8408 decl_type = TREE_TYPE (decl);
8410 if (arg == error_mark_node
8411 || decl == error_mark_node
8412 || TREE_TYPE (arg) == error_mark_node
8413 || decl_type == error_mark_node)
8414 /* Something already went wrong. There's no need to check
8416 return error_mark_node;
8418 /* [dcl.fct.default]
8420 A default argument expression is implicitly converted to the
8422 if (!TREE_TYPE (arg)
8423 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
8426 error ("default argument for %q#D has type %qT",
8427 decl, TREE_TYPE (arg));
8429 error ("default argument for parameter of type %qT has type %qT",
8430 decl_type, TREE_TYPE (arg));
8432 return error_mark_node;
8435 /* [dcl.fct.default]
8437 Local variables shall not be used in default argument
8440 The keyword `this' shall not be used in a default argument of a
8442 var = walk_tree_without_duplicates (&arg, local_variable_p_walkfn,
8446 error ("default argument %qE uses local variable %qD", arg, var);
8447 return error_mark_node;
8454 /* Decode the list of parameter types for a function type.
8455 Given the list of things declared inside the parens,
8456 return a list of types.
8458 If this parameter does not end with an ellipsis, we append
8461 *PARMS is set to the chain of PARM_DECLs created. */
8464 grokparms (cp_parameter_declarator *first_parm, tree *parms)
8466 tree result = NULL_TREE;
8467 tree decls = NULL_TREE;
8468 int ellipsis = !first_parm || first_parm->ellipsis_p;
8469 cp_parameter_declarator *parm;
8472 for (parm = first_parm; parm != NULL; parm = parm->next)
8474 tree type = NULL_TREE;
8475 tree init = parm->default_argument;
8479 if (parm == no_parameters)
8482 attrs = parm->decl_specifiers.attributes;
8483 parm->decl_specifiers.attributes = NULL_TREE;
8484 decl = grokdeclarator (parm->declarator, &parm->decl_specifiers,
8485 PARM, init != NULL_TREE, &attrs);
8486 if (! decl || TREE_TYPE (decl) == error_mark_node)
8490 cplus_decl_attributes (&decl, attrs, 0);
8492 type = TREE_TYPE (decl);
8493 if (VOID_TYPE_P (type))
8495 if (same_type_p (type, void_type_node)
8496 && !DECL_NAME (decl) && !result && !parm->next && !ellipsis)
8497 /* this is a parmlist of `(void)', which is ok. */
8499 cxx_incomplete_type_error (decl, type);
8500 /* It's not a good idea to actually create parameters of
8501 type `void'; other parts of the compiler assume that a
8502 void type terminates the parameter list. */
8503 type = error_mark_node;
8504 TREE_TYPE (decl) = error_mark_node;
8507 if (type != error_mark_node)
8509 /* Top-level qualifiers on the parameters are
8510 ignored for function types. */
8511 type = cp_build_qualified_type (type, 0);
8512 if (TREE_CODE (type) == METHOD_TYPE)
8514 error ("parameter %qD invalidly declared method type", decl);
8515 type = build_pointer_type (type);
8516 TREE_TYPE (decl) = type;
8518 else if (abstract_virtuals_error (decl, type))
8519 any_error = 1; /* Seems like a good idea. */
8520 else if (POINTER_TYPE_P (type))
8522 /* [dcl.fct]/6, parameter types cannot contain pointers
8523 (references) to arrays of unknown bound. */
8524 tree t = TREE_TYPE (type);
8525 int ptr = TYPE_PTR_P (type);
8531 else if (TREE_CODE (t) != ARRAY_TYPE)
8533 else if (!TYPE_DOMAIN (t))
8537 if (TREE_CODE (t) == ARRAY_TYPE)
8538 error ("parameter %qD includes %s to array of unknown "
8540 decl, ptr ? "pointer" : "reference", t);
8543 if (!any_error && init)
8544 init = check_default_argument (decl, init);
8549 TREE_CHAIN (decl) = decls;
8551 result = tree_cons (init, type, result);
8553 decls = nreverse (decls);
8554 result = nreverse (result);
8556 result = chainon (result, void_list_node);
8563 /* D is a constructor or overloaded `operator='.
8565 Let T be the class in which D is declared. Then, this function
8568 -1 if D's is an ill-formed constructor or copy assignment operator
8569 whose first parameter is of type `T'.
8570 0 if D is not a copy constructor or copy assignment
8572 1 if D is a copy constructor or copy assignment operator whose
8573 first parameter is a reference to const qualified T.
8574 2 if D is a copy constructor or copy assignment operator whose
8575 first parameter is a reference to non-const qualified T.
8577 This function can be used as a predicate. Positive values indicate
8578 a copy constructor and nonzero values indicate a copy assignment
8588 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
8590 if (DECL_TEMPLATE_INFO (d)
8591 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d)))
8592 /* Instantiations of template member functions are never copy
8593 functions. Note that member functions of templated classes are
8594 represented as template functions internally, and we must
8595 accept those as copy functions. */
8598 args = FUNCTION_FIRST_USER_PARMTYPE (d);
8602 arg_type = TREE_VALUE (args);
8604 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
8606 /* Pass by value copy assignment operator. */
8609 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
8610 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
8612 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
8618 args = TREE_CHAIN (args);
8620 if (args && args != void_list_node && !TREE_PURPOSE (args))
8621 /* There are more non-optional args. */
8627 /* Remember any special properties of member function DECL. */
8629 void grok_special_member_properties (tree decl)
8631 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P(decl))
8632 ; /* Not special. */
8633 else if (DECL_CONSTRUCTOR_P (decl))
8635 int ctor = copy_fn_p (decl);
8641 A non-template constructor for class X is a copy
8642 constructor if its first parameter is of type X&, const
8643 X&, volatile X& or const volatile X&, and either there
8644 are no other parameters or else all other parameters have
8645 default arguments. */
8646 TYPE_HAS_INIT_REF (DECL_CONTEXT (decl)) = 1;
8648 TYPE_HAS_CONST_INIT_REF (DECL_CONTEXT (decl)) = 1;
8650 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
8651 TYPE_HAS_DEFAULT_CONSTRUCTOR (DECL_CONTEXT (decl)) = 1;
8653 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
8657 A non-template assignment operator for class X is a copy
8658 assignment operator if its parameter is of type X, X&, const
8659 X&, volatile X& or const volatile X&. */
8661 int assop = copy_fn_p (decl);
8665 TYPE_HAS_ASSIGN_REF (DECL_CONTEXT (decl)) = 1;
8667 TYPE_HAS_CONST_ASSIGN_REF (DECL_CONTEXT (decl)) = 1;
8672 /* Check a constructor DECL has the correct form. Complains
8673 if the class has a constructor of the form X(X). */
8676 grok_ctor_properties (tree ctype, tree decl)
8678 int ctor_parm = copy_fn_p (decl);
8684 A declaration of a constructor for a class X is ill-formed if
8685 its first parameter is of type (optionally cv-qualified) X
8686 and either there are no other parameters or else all other
8687 parameters have default arguments.
8689 We *don't* complain about member template instantiations that
8690 have this form, though; they can occur as we try to decide
8691 what constructor to use during overload resolution. Since
8692 overload resolution will never prefer such a constructor to
8693 the non-template copy constructor (which is either explicitly
8694 or implicitly defined), there's no need to worry about their
8695 existence. Theoretically, they should never even be
8696 instantiated, but that's hard to forestall. */
8697 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
8705 /* An operator with this code is unary, but can also be binary. */
8708 ambi_op_p (enum tree_code code)
8710 return (code == INDIRECT_REF
8711 || code == ADDR_EXPR
8712 || code == UNARY_PLUS_EXPR
8713 || code == NEGATE_EXPR
8714 || code == PREINCREMENT_EXPR
8715 || code == PREDECREMENT_EXPR);
8718 /* An operator with this name can only be unary. */
8721 unary_op_p (enum tree_code code)
8723 return (code == TRUTH_NOT_EXPR
8724 || code == BIT_NOT_EXPR
8725 || code == COMPONENT_REF
8726 || code == TYPE_EXPR);
8729 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
8730 errors are issued for invalid declarations. */
8733 grok_op_properties (tree decl, bool complain)
8735 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
8737 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
8738 tree name = DECL_NAME (decl);
8739 enum tree_code operator_code;
8743 /* Count the number of arguments. */
8744 for (argtype = argtypes, arity = 0;
8745 argtype && argtype != void_list_node;
8746 argtype = TREE_CHAIN (argtype))
8749 class_type = DECL_CONTEXT (decl);
8750 if (class_type && !CLASS_TYPE_P (class_type))
8751 class_type = NULL_TREE;
8753 if (DECL_CONV_FN_P (decl))
8754 operator_code = TYPE_EXPR;
8758 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
8759 if (ansi_opname (CODE) == name) \
8761 operator_code = (CODE); \
8764 else if (ansi_assopname (CODE) == name) \
8766 operator_code = (CODE); \
8767 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
8771 #include "operators.def"
8777 gcc_assert (operator_code != LAST_CPLUS_TREE_CODE);
8778 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
8781 switch (operator_code)
8784 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
8788 TYPE_GETS_DELETE (class_type) |= 1;
8792 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
8795 case VEC_DELETE_EXPR:
8796 TYPE_GETS_DELETE (class_type) |= 2;
8803 /* [basic.std.dynamic.allocation]/1:
8805 A program is ill-formed if an allocation function is declared
8806 in a namespace scope other than global scope or declared static
8809 The same also holds true for deallocation functions. */
8810 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
8811 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
8813 if (DECL_NAMESPACE_SCOPE_P (decl))
8815 if (CP_DECL_CONTEXT (decl) != global_namespace)
8816 error ("%qD may not be declared within a namespace", decl);
8817 else if (!TREE_PUBLIC (decl))
8818 error ("%qD may not be declared as static", decl);
8822 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
8823 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
8824 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
8825 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
8828 /* An operator function must either be a non-static member function
8829 or have at least one parameter of a class, a reference to a class,
8830 an enumeration, or a reference to an enumeration. 13.4.0.6 */
8831 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
8833 if (operator_code == TYPE_EXPR
8834 || operator_code == CALL_EXPR
8835 || operator_code == COMPONENT_REF
8836 || operator_code == ARRAY_REF
8837 || operator_code == NOP_EXPR)
8839 error ("%qD must be a nonstatic member function", decl);
8846 if (DECL_STATIC_FUNCTION_P (decl))
8848 error ("%qD must be either a non-static member "
8849 "function or a non-member function", decl);
8853 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
8855 tree arg = non_reference (TREE_VALUE (p));
8856 /* IS_AGGR_TYPE, rather than CLASS_TYPE_P, is used
8857 because these checks are performed even on
8858 template functions. */
8859 if (IS_AGGR_TYPE (arg) || TREE_CODE (arg) == ENUMERAL_TYPE)
8863 if (!p || p == void_list_node)
8868 error ("%qD must have an argument of class or "
8875 /* There are no restrictions on the arguments to an overloaded
8877 if (operator_code == CALL_EXPR)
8880 /* Warn about conversion operators that will never be used. */
8881 if (IDENTIFIER_TYPENAME_P (name)
8882 && ! DECL_TEMPLATE_INFO (decl)
8884 /* Warn only declaring the function; there is no need to
8885 warn again about out-of-class definitions. */
8886 && class_type == current_class_type)
8888 tree t = TREE_TYPE (name);
8889 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
8890 const char *what = 0;
8893 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
8895 if (TREE_CODE (t) == VOID_TYPE)
8897 else if (class_type)
8899 if (t == class_type)
8900 what = "the same type";
8901 /* Don't force t to be complete here. */
8902 else if (IS_AGGR_TYPE (t)
8903 && COMPLETE_TYPE_P (t)
8904 && DERIVED_FROM_P (t, class_type))
8905 what = "a base class";
8909 warning (0, "conversion to %s%s will never use a type "
8910 "conversion operator",
8911 ref ? "a reference to " : "", what);
8913 if (operator_code == COND_EXPR)
8916 error ("ISO C++ prohibits overloading operator ?:");
8918 else if (ambi_op_p (operator_code))
8921 /* We pick the one-argument operator codes by default, so
8922 we don't have to change anything. */
8924 else if (arity == 2)
8926 /* If we thought this was a unary operator, we now know
8927 it to be a binary operator. */
8928 switch (operator_code)
8931 operator_code = MULT_EXPR;
8935 operator_code = BIT_AND_EXPR;
8938 case UNARY_PLUS_EXPR:
8939 operator_code = PLUS_EXPR;
8943 operator_code = MINUS_EXPR;
8946 case PREINCREMENT_EXPR:
8947 operator_code = POSTINCREMENT_EXPR;
8950 case PREDECREMENT_EXPR:
8951 operator_code = POSTDECREMENT_EXPR;
8958 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
8960 if ((operator_code == POSTINCREMENT_EXPR
8961 || operator_code == POSTDECREMENT_EXPR)
8962 && ! processing_template_decl
8963 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
8966 error ("postfix %qD must take %<int%> as its argument",
8970 ("postfix %qD must take %<int%> as its second argument",
8977 error ("%qD must take either zero or one argument", decl);
8979 error ("%qD must take either one or two arguments", decl);
8982 /* More Effective C++ rule 6. */
8984 && (operator_code == POSTINCREMENT_EXPR
8985 || operator_code == POSTDECREMENT_EXPR
8986 || operator_code == PREINCREMENT_EXPR
8987 || operator_code == PREDECREMENT_EXPR))
8989 tree arg = TREE_VALUE (argtypes);
8990 tree ret = TREE_TYPE (TREE_TYPE (decl));
8991 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
8992 arg = TREE_TYPE (arg);
8993 arg = TYPE_MAIN_VARIANT (arg);
8994 if (operator_code == PREINCREMENT_EXPR
8995 || operator_code == PREDECREMENT_EXPR)
8997 if (TREE_CODE (ret) != REFERENCE_TYPE
8998 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
9000 warning (0, "prefix %qD should return %qT", decl,
9001 build_reference_type (arg));
9005 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
9006 warning (0, "postfix %qD should return %qT", decl, arg);
9010 else if (unary_op_p (operator_code))
9015 error ("%qD must take %<void%>", decl);
9017 error ("%qD must take exactly one argument", decl);
9020 else /* if (binary_op_p (operator_code)) */
9025 error ("%qD must take exactly one argument", decl);
9027 error ("%qD must take exactly two arguments", decl);
9030 /* More Effective C++ rule 7. */
9032 && (operator_code == TRUTH_ANDIF_EXPR
9033 || operator_code == TRUTH_ORIF_EXPR
9034 || operator_code == COMPOUND_EXPR))
9035 warning (0, "user-defined %qD always evaluates both arguments",
9039 /* Effective C++ rule 23. */
9042 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
9043 && (operator_code == PLUS_EXPR
9044 || operator_code == MINUS_EXPR
9045 || operator_code == TRUNC_DIV_EXPR
9046 || operator_code == MULT_EXPR
9047 || operator_code == TRUNC_MOD_EXPR)
9048 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
9049 warning (0, "%qD should return by value", decl);
9052 for (; argtypes && argtypes != void_list_node;
9053 argtypes = TREE_CHAIN (argtypes))
9054 if (TREE_PURPOSE (argtypes))
9056 TREE_PURPOSE (argtypes) = NULL_TREE;
9057 if (operator_code == POSTINCREMENT_EXPR
9058 || operator_code == POSTDECREMENT_EXPR)
9061 pedwarn ("%qD cannot have default arguments", decl);
9064 error ("%qD cannot have default arguments", decl);
9071 /* Return a string giving the keyword associate with CODE. */
9074 tag_name (enum tag_types code)
9093 /* Name lookup in an elaborated-type-specifier (after the keyword
9094 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
9095 elaborated-type-specifier is invalid, issue a diagnostic and return
9096 error_mark_node; otherwise, return the *_TYPE to which it referred.
9097 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
9100 check_elaborated_type_specifier (enum tag_types tag_code,
9102 bool allow_template_p)
9108 struct S { struct S *p; };
9110 name lookup will find the TYPE_DECL for the implicit "S::S"
9111 typedef. Adjust for that here. */
9112 if (DECL_SELF_REFERENCE_P (decl))
9113 decl = TYPE_NAME (TREE_TYPE (decl));
9115 type = TREE_TYPE (decl);
9117 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
9118 is false for this case as well. */
9119 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
9121 error ("using template type parameter %qT after %qs",
9122 type, tag_name (tag_code));
9123 return error_mark_node;
9127 If the identifier resolves to a typedef-name or a template
9128 type-parameter, the elaborated-type-specifier is ill-formed.
9130 In other words, the only legitimate declaration to use in the
9131 elaborated type specifier is the implicit typedef created when
9132 the type is declared. */
9133 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
9134 && tag_code != typename_type)
9136 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
9137 error ("%q+D has a previous declaration here", decl);
9138 return error_mark_node;
9140 else if (TREE_CODE (type) != RECORD_TYPE
9141 && TREE_CODE (type) != UNION_TYPE
9142 && tag_code != enum_type
9143 && tag_code != typename_type)
9145 error ("%qT referred to as %qs", type, tag_name (tag_code));
9146 error ("%q+T has a previous declaration here", type);
9147 return error_mark_node;
9149 else if (TREE_CODE (type) != ENUMERAL_TYPE
9150 && tag_code == enum_type)
9152 error ("%qT referred to as enum", type);
9153 error ("%q+T has a previous declaration here", type);
9154 return error_mark_node;
9156 else if (!allow_template_p
9157 && TREE_CODE (type) == RECORD_TYPE
9158 && CLASSTYPE_IS_TEMPLATE (type))
9160 /* If a class template appears as elaborated type specifier
9161 without a template header such as:
9163 template <class T> class C {};
9164 void f(class C); // No template header here
9166 then the required template argument is missing. */
9167 error ("template argument required for %<%s %T%>",
9168 tag_name (tag_code),
9169 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
9170 return error_mark_node;
9176 /* Lookup NAME in elaborate type specifier in scope according to
9177 SCOPE and issue diagnostics if necessary.
9178 Return *_TYPE node upon success, NULL_TREE when the NAME is not
9179 found, and ERROR_MARK_NODE for type error. */
9182 lookup_and_check_tag (enum tag_types tag_code, tree name,
9183 tag_scope scope, bool template_header_p)
9187 if (scope == ts_global)
9189 /* First try ordinary name lookup, ignoring hidden class name
9190 injected via friend declaration. */
9191 decl = lookup_name (name, 2);
9192 /* If that fails, the name will be placed in the smallest
9193 non-class, non-function-prototype scope according to 3.3.1/5.
9194 We may already have a hidden name declared as friend in this
9195 scope. So lookup again but not ignoring hidden name.
9196 If we find one, that name will be made visible rather than
9197 creating a new tag. */
9199 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
9202 decl = lookup_type_scope (name, scope);
9204 if (decl && DECL_CLASS_TEMPLATE_P (decl))
9205 decl = DECL_TEMPLATE_RESULT (decl);
9207 if (decl && TREE_CODE (decl) == TYPE_DECL)
9209 /* Look for invalid nested type:
9213 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
9215 error ("%qD has the same name as the class in which it is "
9218 return error_mark_node;
9221 /* Two cases we need to consider when deciding if a class
9222 template is allowed as an elaborated type specifier:
9223 1. It is a self reference to its own class.
9224 2. It comes with a template header.
9228 template <class T> class C {
9229 class C *c1; // DECL_SELF_REFERENCE_P is true
9232 template <class U> class C; // template_header_p is true
9233 template <class T> class C<T>::D {
9234 class C *c2; // DECL_SELF_REFERENCE_P is true
9237 t = check_elaborated_type_specifier (tag_code,
9240 | DECL_SELF_REFERENCE_P (decl));
9247 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
9248 Define the tag as a forward-reference if it is not defined.
9250 If a declaration is given, process it here, and report an error if
9251 multiple declarations are not identical.
9253 SCOPE is TS_CURRENT when this is also a definition. Only look in
9254 the current frame for the name (since C++ allows new names in any
9255 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
9256 declaration. Only look beginning from the current scope outward up
9257 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
9259 TEMPLATE_HEADER_P is true when this declaration is preceded by
9260 a set of template parameters. */
9263 xref_tag (enum tag_types tag_code, tree name,
9264 tag_scope scope, bool template_header_p)
9266 enum tree_code code;
9268 tree context = NULL_TREE;
9270 timevar_push (TV_NAME_LOOKUP);
9272 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
9284 code = ENUMERAL_TYPE;
9290 /* In case of anonymous name, xref_tag is only called to
9291 make type node and push name. Name lookup is not required. */
9292 if (ANON_AGGRNAME_P (name))
9295 t = lookup_and_check_tag (tag_code, name,
9296 scope, template_header_p);
9298 if (t == error_mark_node)
9299 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
9301 if (scope != ts_current && t && current_class_type
9302 && template_class_depth (current_class_type)
9303 && template_header_p)
9305 /* Since SCOPE is not TS_CURRENT, we are not looking at a
9306 definition of this tag. Since, in addition, we are currently
9307 processing a (member) template declaration of a template
9308 class, we must be very careful; consider:
9315 { template <class V>
9316 friend struct S1; };
9318 Here, the S2::S1 declaration should not be confused with the
9319 outer declaration. In particular, the inner version should
9320 have a template parameter of level 2, not level 1. This
9321 would be particularly important if the member declaration
9324 template <class V = U> friend struct S1;
9326 say, when we should tsubst into `U' when instantiating
9327 S2. On the other hand, when presented with:
9337 we must find the inner binding eventually. We
9338 accomplish this by making sure that the new type we
9339 create to represent this declaration has the right
9341 context = TYPE_CONTEXT (t);
9347 /* If no such tag is yet defined, create a forward-reference node
9348 and record it as the "definition".
9349 When a real declaration of this type is found,
9350 the forward-reference will be altered into a real type. */
9351 if (code == ENUMERAL_TYPE)
9353 error ("use of enum %q#D without previous declaration", name);
9354 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
9358 t = make_aggr_type (code);
9359 TYPE_CONTEXT (t) = context;
9360 t = pushtag (name, t, scope);
9365 if (template_header_p && IS_AGGR_TYPE (t))
9366 redeclare_class_template (t, current_template_parms);
9367 else if (!processing_template_decl
9369 && CLASSTYPE_IS_TEMPLATE (t))
9371 error ("redeclaration of %qT as a non-template", t);
9372 t = error_mark_node;
9375 /* Make injected friend class visible. */
9376 if (scope != ts_within_enclosing_non_class
9377 && hidden_name_p (TYPE_NAME (t)))
9379 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
9380 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
9382 if (TYPE_TEMPLATE_INFO (t))
9384 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
9385 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
9390 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t);
9394 xref_tag_from_type (tree old, tree id, tag_scope scope)
9396 enum tag_types tag_kind;
9398 if (TREE_CODE (old) == RECORD_TYPE)
9399 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
9401 tag_kind = union_type;
9403 if (id == NULL_TREE)
9404 id = TYPE_IDENTIFIER (old);
9406 return xref_tag (tag_kind, id, scope, false);
9409 /* Create the binfo hierarchy for REF with (possibly NULL) base list
9410 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
9411 access_* node, and the TREE_VALUE is the type of the base-class.
9412 Non-NULL TREE_TYPE indicates virtual inheritance. */
9415 xref_basetypes (tree ref, tree base_list)
9418 tree binfo, base_binfo;
9419 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
9420 unsigned max_bases = 0; /* Maximum direct bases. */
9422 tree default_access;
9423 tree igo_prev; /* Track Inheritance Graph Order. */
9425 if (ref == error_mark_node)
9428 /* The base of a derived class is private by default, all others are
9430 default_access = (TREE_CODE (ref) == RECORD_TYPE
9431 && CLASSTYPE_DECLARED_CLASS (ref)
9432 ? access_private_node : access_public_node);
9434 /* First, make sure that any templates in base-classes are
9435 instantiated. This ensures that if we call ourselves recursively
9436 we do not get confused about which classes are marked and which
9441 tree basetype = TREE_VALUE (*basep);
9443 if (!(processing_template_decl && uses_template_parms (basetype))
9444 && !complete_type_or_else (basetype, NULL))
9445 /* An incomplete type. Remove it from the list. */
9446 *basep = TREE_CHAIN (*basep);
9450 if (TREE_TYPE (*basep))
9452 if (CLASS_TYPE_P (basetype))
9453 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
9454 basep = &TREE_CHAIN (*basep);
9458 TYPE_MARKED_P (ref) = 1;
9460 /* The binfo slot should be empty, unless this is an (ill-formed)
9462 gcc_assert (!TYPE_BINFO (ref) || TYPE_SIZE (ref));
9463 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
9465 binfo = make_tree_binfo (max_bases);
9467 TYPE_BINFO (ref) = binfo;
9468 BINFO_OFFSET (binfo) = size_zero_node;
9469 BINFO_TYPE (binfo) = ref;
9473 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
9474 /* An aggregate cannot have baseclasses. */
9475 CLASSTYPE_NON_AGGREGATE (ref) = 1;
9477 if (TREE_CODE (ref) == UNION_TYPE)
9478 error ("derived union %qT invalid", ref);
9483 if (TYPE_FOR_JAVA (ref))
9484 error ("Java class %qT cannot have multiple bases", ref);
9489 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
9491 if (TYPE_FOR_JAVA (ref))
9492 error ("Java class %qT cannot have virtual bases", ref);
9495 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
9497 tree access = TREE_PURPOSE (base_list);
9498 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
9499 tree basetype = TREE_VALUE (base_list);
9501 if (access == access_default_node)
9502 access = default_access;
9504 if (TREE_CODE (basetype) == TYPE_DECL)
9505 basetype = TREE_TYPE (basetype);
9506 if (TREE_CODE (basetype) != RECORD_TYPE
9507 && TREE_CODE (basetype) != TYPENAME_TYPE
9508 && TREE_CODE (basetype) != TEMPLATE_TYPE_PARM
9509 && TREE_CODE (basetype) != BOUND_TEMPLATE_TEMPLATE_PARM)
9511 error ("base type %qT fails to be a struct or class type",
9516 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
9517 TYPE_FOR_JAVA (ref) = 1;
9519 base_binfo = NULL_TREE;
9520 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
9522 base_binfo = TYPE_BINFO (basetype);
9523 /* The original basetype could have been a typedef'd type. */
9524 basetype = BINFO_TYPE (base_binfo);
9526 /* Inherit flags from the base. */
9527 TYPE_HAS_NEW_OPERATOR (ref)
9528 |= TYPE_HAS_NEW_OPERATOR (basetype);
9529 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
9530 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
9531 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
9532 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
9533 CLASSTYPE_DIAMOND_SHAPED_P (ref)
9534 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
9535 CLASSTYPE_REPEATED_BASE_P (ref)
9536 |= CLASSTYPE_REPEATED_BASE_P (basetype);
9539 /* We must do this test after we've seen through a typedef
9541 if (TYPE_MARKED_P (basetype))
9543 if (basetype == ref)
9544 error ("recursive type %qT undefined", basetype);
9546 error ("duplicate base type %qT invalid", basetype);
9549 TYPE_MARKED_P (basetype) = 1;
9551 base_binfo = copy_binfo (base_binfo, basetype, ref,
9552 &igo_prev, via_virtual);
9553 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
9554 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
9556 BINFO_BASE_APPEND (binfo, base_binfo);
9557 BINFO_BASE_ACCESS_APPEND (binfo, access);
9560 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
9561 /* If we have space in the vbase vector, we must have shared at
9562 least one of them, and are therefore diamond shaped. */
9563 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
9565 /* Unmark all the types. */
9566 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
9567 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
9568 TYPE_MARKED_P (ref) = 0;
9570 /* Now see if we have a repeated base type. */
9571 if (!CLASSTYPE_REPEATED_BASE_P (ref))
9573 for (base_binfo = binfo; base_binfo;
9574 base_binfo = TREE_CHAIN (base_binfo))
9576 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
9578 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
9581 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
9583 for (base_binfo = binfo; base_binfo;
9584 base_binfo = TREE_CHAIN (base_binfo))
9585 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
9586 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
9593 /* Begin compiling the definition of an enumeration type.
9595 Returns the type object, as yet incomplete.
9596 Also records info about it so that build_enumerator
9597 may be used to declare the individual values as they are read. */
9600 start_enum (tree name)
9604 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
9606 /* If this is the real definition for a previous forward reference,
9607 fill in the contents in the same object that used to be the
9608 forward reference. */
9610 enumtype = lookup_and_check_tag (enum_type, name,
9611 /*tag_scope=*/ts_current,
9612 /*template_header_p=*/false);
9614 if (enumtype != NULL_TREE && TREE_CODE (enumtype) == ENUMERAL_TYPE)
9616 error ("multiple definition of %q#T", enumtype);
9617 error ("%Jprevious definition here", TYPE_MAIN_DECL (enumtype));
9618 /* Clear out TYPE_VALUES, and start again. */
9619 TYPE_VALUES (enumtype) = NULL_TREE;
9623 /* In case of error, make a dummy enum to allow parsing to
9625 if (enumtype == error_mark_node)
9626 name = make_anon_name ();
9628 enumtype = make_node (ENUMERAL_TYPE);
9629 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
9635 /* After processing and defining all the values of an enumeration type,
9636 install their decls in the enumeration type and finish it off.
9637 ENUMTYPE is the type object and VALUES a list of name-value pairs. */
9640 finish_enum (tree enumtype)
9649 bool use_short_enum;
9653 integer_type_kind itk;
9654 tree underlying_type = NULL_TREE;
9656 /* We built up the VALUES in reverse order. */
9657 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
9659 /* For an enum defined in a template, just set the type of the values;
9660 all further processing is postponed until the template is
9661 instantiated. We need to set the type so that tsubst of a CONST_DECL
9663 if (processing_template_decl)
9665 for (values = TYPE_VALUES (enumtype);
9667 values = TREE_CHAIN (values))
9668 TREE_TYPE (TREE_VALUE (values)) = enumtype;
9669 if (at_function_scope_p ())
9670 add_stmt (build_min (TAG_DEFN, enumtype));
9674 /* Determine the minimum and maximum values of the enumerators. */
9675 if (TYPE_VALUES (enumtype))
9677 minnode = maxnode = NULL_TREE;
9679 for (values = TYPE_VALUES (enumtype);
9681 values = TREE_CHAIN (values))
9683 decl = TREE_VALUE (values);
9685 /* [dcl.enum]: Following the closing brace of an enum-specifier,
9686 each enumerator has the type of its enumeration. Prior to the
9687 closing brace, the type of each enumerator is the type of its
9688 initializing value. */
9689 TREE_TYPE (decl) = enumtype;
9691 /* Update the minimum and maximum values, if appropriate. */
9692 value = DECL_INITIAL (decl);
9693 /* Figure out what the minimum and maximum values of the
9696 minnode = maxnode = value;
9697 else if (tree_int_cst_lt (maxnode, value))
9699 else if (tree_int_cst_lt (value, minnode))
9706 If the enumerator-list is empty, the underlying type is as if
9707 the enumeration had a single enumerator with value 0. */
9708 minnode = maxnode = integer_zero_node;
9710 /* Compute the number of bits require to represent all values of the
9711 enumeration. We must do this before the type of MINNODE and
9712 MAXNODE are transformed, since min_precision relies on the
9713 TREE_TYPE of the value it is passed. */
9714 unsignedp = tree_int_cst_sgn (minnode) >= 0;
9715 lowprec = min_precision (minnode, unsignedp);
9716 highprec = min_precision (maxnode, unsignedp);
9717 precision = MAX (lowprec, highprec);
9719 /* Determine the underlying type of the enumeration.
9723 The underlying type of an enumeration is an integral type that
9724 can represent all the enumerator values defined in the
9725 enumeration. It is implementation-defined which integral type is
9726 used as the underlying type for an enumeration except that the
9727 underlying type shall not be larger than int unless the value of
9728 an enumerator cannot fit in an int or unsigned int.
9730 We use "int" or an "unsigned int" as the underlying type, even if
9731 a smaller integral type would work, unless the user has
9732 explicitly requested that we use the smallest possible type. The
9733 user can request that for all enumerations with a command line
9734 flag, or for just one enumeration with an attribute. */
9736 use_short_enum = flag_short_enums
9737 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
9739 for (itk = (use_short_enum ? itk_char : itk_int);
9743 underlying_type = integer_types[itk];
9744 if (TYPE_PRECISION (underlying_type) >= precision
9745 && TYPE_UNSIGNED (underlying_type) == unsignedp)
9748 if (itk == itk_none)
9752 IF no integral type can represent all the enumerator values, the
9753 enumeration is ill-formed. */
9754 error ("no integral type can represent all of the enumerator values "
9755 "for %qT", enumtype);
9756 precision = TYPE_PRECISION (long_long_integer_type_node);
9757 underlying_type = integer_types[itk_unsigned_long_long];
9760 /* Compute the minium and maximum values for the type.
9764 For an enumeration where emin is the smallest enumerator and emax
9765 is the largest, the values of the enumeration are the values of the
9766 underlying type in the range bmin to bmax, where bmin and bmax are,
9767 respectively, the smallest and largest values of the smallest bit-
9768 field that can store emin and emax. */
9770 /* The middle-end currently assumes that types with TYPE_PRECISION
9771 narrower than their underlying type are suitably zero or sign
9772 extended to fill their mode. g++ doesn't make these guarantees.
9773 Until the middle-end can represent such paradoxical types, we
9774 set the TYPE_PRECISION to the width of the underlying type. */
9775 TYPE_PRECISION (enumtype) = TYPE_PRECISION (underlying_type);
9777 set_min_and_max_values_for_integral_type (enumtype, precision, unsignedp);
9781 The value of sizeof() applied to an enumeration type, an object
9782 of an enumeration type, or an enumerator, is the value of sizeof()
9783 applied to the underlying type. */
9784 TYPE_SIZE (enumtype) = TYPE_SIZE (underlying_type);
9785 TYPE_SIZE_UNIT (enumtype) = TYPE_SIZE_UNIT (underlying_type);
9786 TYPE_MODE (enumtype) = TYPE_MODE (underlying_type);
9787 TYPE_ALIGN (enumtype) = TYPE_ALIGN (underlying_type);
9788 TYPE_USER_ALIGN (enumtype) = TYPE_USER_ALIGN (underlying_type);
9789 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (underlying_type);
9791 /* Convert each of the enumerators to the type of the underlying
9792 type of the enumeration. */
9793 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
9795 decl = TREE_VALUE (values);
9796 value = perform_implicit_conversion (underlying_type,
9797 DECL_INITIAL (decl));
9799 /* Do not clobber shared ints. */
9800 value = copy_node (value);
9802 TREE_TYPE (value) = enumtype;
9803 DECL_INITIAL (decl) = value;
9804 TREE_VALUE (values) = value;
9807 /* Fix up all variant types of this enum type. */
9808 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
9810 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
9811 TYPE_MIN_VALUE (t) = TYPE_MIN_VALUE (enumtype);
9812 TYPE_MAX_VALUE (t) = TYPE_MAX_VALUE (enumtype);
9813 TYPE_SIZE (t) = TYPE_SIZE (enumtype);
9814 TYPE_SIZE_UNIT (t) = TYPE_SIZE_UNIT (enumtype);
9815 TYPE_MODE (t) = TYPE_MODE (enumtype);
9816 TYPE_PRECISION (t) = TYPE_PRECISION (enumtype);
9817 TYPE_ALIGN (t) = TYPE_ALIGN (enumtype);
9818 TYPE_USER_ALIGN (t) = TYPE_USER_ALIGN (enumtype);
9819 TYPE_UNSIGNED (t) = TYPE_UNSIGNED (enumtype);
9822 /* Finish debugging output for this type. */
9823 rest_of_type_compilation (enumtype, namespace_bindings_p ());
9826 /* Build and install a CONST_DECL for an enumeration constant of the
9827 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
9828 Assignment of sequential values by default is handled here. */
9831 build_enumerator (tree name, tree value, tree enumtype)
9837 /* If the VALUE was erroneous, pretend it wasn't there; that will
9838 result in the enum being assigned the next value in sequence. */
9839 if (value == error_mark_node)
9842 /* Remove no-op casts from the value. */
9844 STRIP_TYPE_NOPS (value);
9846 if (! processing_template_decl)
9848 /* Validate and default VALUE. */
9849 if (value != NULL_TREE)
9851 value = integral_constant_value (value);
9853 if (TREE_CODE (value) == INTEGER_CST)
9855 value = perform_integral_promotions (value);
9856 constant_expression_warning (value);
9860 error ("enumerator value for %qD not integer constant", name);
9865 /* Default based on previous value. */
9866 if (value == NULL_TREE)
9868 if (TYPE_VALUES (enumtype))
9871 unsigned HOST_WIDE_INT lo;
9875 /* The next value is the previous value plus one. We can
9876 safely assume that the previous value is an INTEGER_CST.
9877 add_double doesn't know the type of the target expression,
9878 so we must check with int_fits_type_p as well. */
9879 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
9880 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
9881 TREE_INT_CST_HIGH (prev_value),
9883 value = build_int_cst_wide (TREE_TYPE (prev_value), lo, hi);
9884 overflowed |= !int_fits_type_p (value, TREE_TYPE (prev_value));
9887 error ("overflow in enumeration values at %qD", name);
9890 value = integer_zero_node;
9893 /* Remove no-op casts from the value. */
9894 STRIP_TYPE_NOPS (value);
9897 /* C++ associates enums with global, function, or class declarations. */
9898 context = current_scope ();
9900 /* Build the actual enumeration constant. Note that the enumeration
9901 constants have the type of their initializers until the
9902 enumeration is complete:
9906 Following the closing brace of an enum-specifier, each enumer-
9907 ator has the type of its enumeration. Prior to the closing
9908 brace, the type of each enumerator is the type of its
9911 In finish_enum we will reset the type. Of course, if we're
9912 processing a template, there may be no value. */
9913 type = value ? TREE_TYPE (value) : NULL_TREE;
9915 if (context && context == current_class_type)
9916 /* This enum declaration is local to the class. We need the full
9917 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
9918 decl = build_lang_decl (CONST_DECL, name, type);
9920 /* It's a global enum, or it's local to a function. (Note local to
9921 a function could mean local to a class method. */
9922 decl = build_decl (CONST_DECL, name, type);
9924 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
9925 TREE_CONSTANT (decl) = 1;
9926 TREE_INVARIANT (decl) = 1;
9927 TREE_READONLY (decl) = 1;
9928 DECL_INITIAL (decl) = value;
9930 if (context && context == current_class_type)
9931 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
9932 on the TYPE_FIELDS list for `S'. (That's so that you can say
9933 things like `S::i' later.) */
9934 finish_member_declaration (decl);
9938 /* Add this enumeration constant to the list for this type. */
9939 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
9943 /* We're defining DECL. Make sure that it's type is OK. */
9946 check_function_type (tree decl, tree current_function_parms)
9948 tree fntype = TREE_TYPE (decl);
9949 tree return_type = complete_type (TREE_TYPE (fntype));
9951 /* In a function definition, arg types must be complete. */
9952 require_complete_types_for_parms (current_function_parms);
9954 if (dependent_type_p (return_type))
9956 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
9958 error ("return type %q#T is incomplete", TREE_TYPE (fntype));
9960 /* Make it return void instead, but don't change the
9961 type of the DECL_RESULT, in case we have a named return value. */
9962 if (TREE_CODE (fntype) == METHOD_TYPE)
9964 tree ctype = TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (fntype)));
9966 = build_method_type_directly (ctype,
9968 FUNCTION_ARG_CHAIN (decl));
9972 = build_function_type (void_type_node,
9973 TYPE_ARG_TYPES (TREE_TYPE (decl)));
9975 = build_exception_variant (fntype,
9976 TYPE_RAISES_EXCEPTIONS (fntype));
9979 abstract_virtuals_error (decl, TREE_TYPE (fntype));
9982 /* Create the FUNCTION_DECL for a function definition.
9983 DECLSPECS and DECLARATOR are the parts of the declaration;
9984 they describe the function's name and the type it returns,
9985 but twisted together in a fashion that parallels the syntax of C.
9987 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
9988 DECLARATOR is really the DECL for the function we are about to
9989 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
9990 indicating that the function is an inline defined in-class.
9992 This function creates a binding context for the function body
9993 as well as setting up the FUNCTION_DECL in current_function_decl.
9995 For C++, we must first check whether that datum makes any sense.
9996 For example, "class A local_a(1,2);" means that variable local_a
9997 is an aggregate of type A, which should have a constructor
9998 applied to it with the argument list [1, 2]. */
10001 start_preparsed_function (tree decl1, tree attrs, int flags)
10003 tree ctype = NULL_TREE;
10006 int doing_friend = 0;
10007 struct cp_binding_level *bl;
10008 tree current_function_parms;
10009 struct c_fileinfo *finfo
10010 = get_fileinfo (lbasename (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1))));
10012 /* Sanity check. */
10013 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
10014 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
10016 fntype = TREE_TYPE (decl1);
10017 if (TREE_CODE (fntype) == METHOD_TYPE)
10018 ctype = TYPE_METHOD_BASETYPE (fntype);
10020 /* ISO C++ 11.4/5. A friend function defined in a class is in
10021 the (lexical) scope of the class in which it is defined. */
10022 if (!ctype && DECL_FRIEND_P (decl1))
10024 ctype = DECL_FRIEND_CONTEXT (decl1);
10026 /* CTYPE could be null here if we're dealing with a template;
10027 for example, `inline friend float foo()' inside a template
10028 will have no CTYPE set. */
10029 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
10035 if (DECL_DECLARED_INLINE_P (decl1)
10036 && lookup_attribute ("noinline", attrs))
10037 warning (0, "inline function %q+D given attribute noinline", decl1);
10039 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
10040 /* This is a constructor, we must ensure that any default args
10041 introduced by this definition are propagated to the clones
10042 now. The clones are used directly in overload resolution. */
10043 adjust_clone_args (decl1);
10045 /* Sometimes we don't notice that a function is a static member, and
10046 build a METHOD_TYPE for it. Fix that up now. */
10047 if (ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
10048 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE)
10050 revert_static_member_fn (decl1);
10054 /* Set up current_class_type, and enter the scope of the class, if
10057 push_nested_class (ctype);
10058 else if (DECL_STATIC_FUNCTION_P (decl1))
10059 push_nested_class (DECL_CONTEXT (decl1));
10061 /* Now that we have entered the scope of the class, we must restore
10062 the bindings for any template parameters surrounding DECL1, if it
10063 is an inline member template. (Order is important; consider the
10064 case where a template parameter has the same name as a field of
10065 the class.) It is not until after this point that
10066 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
10067 if (flags & SF_INCLASS_INLINE)
10068 maybe_begin_member_template_processing (decl1);
10070 /* Effective C++ rule 15. */
10072 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
10073 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
10074 warning (0, "%<operator=%> should return a reference to %<*this%>");
10076 /* Make the init_value nonzero so pushdecl knows this is not tentative.
10077 error_mark_node is replaced below (in poplevel) with the BLOCK. */
10078 if (!DECL_INITIAL (decl1))
10079 DECL_INITIAL (decl1) = error_mark_node;
10081 /* This function exists in static storage.
10082 (This does not mean `static' in the C sense!) */
10083 TREE_STATIC (decl1) = 1;
10085 /* We must call push_template_decl after current_class_type is set
10086 up. (If we are processing inline definitions after exiting a
10087 class scope, current_class_type will be NULL_TREE until set above
10088 by push_nested_class.) */
10089 if (processing_template_decl)
10091 /* FIXME: Handle error_mark_node more gracefully. */
10092 tree newdecl1 = push_template_decl (decl1);
10093 if (newdecl1 != error_mark_node)
10097 /* We are now in the scope of the function being defined. */
10098 current_function_decl = decl1;
10100 /* Save the parm names or decls from this function's declarator
10101 where store_parm_decls will find them. */
10102 current_function_parms = DECL_ARGUMENTS (decl1);
10104 /* Make sure the parameter and return types are reasonable. When
10105 you declare a function, these types can be incomplete, but they
10106 must be complete when you define the function. */
10107 check_function_type (decl1, current_function_parms);
10109 /* Build the return declaration for the function. */
10110 restype = TREE_TYPE (fntype);
10111 /* Promote the value to int before returning it. */
10112 if (c_promoting_integer_type_p (restype))
10113 restype = type_promotes_to (restype);
10114 if (DECL_RESULT (decl1) == NULL_TREE)
10118 resdecl = build_decl (RESULT_DECL, 0, TYPE_MAIN_VARIANT (restype));
10119 DECL_ARTIFICIAL (resdecl) = 1;
10120 DECL_IGNORED_P (resdecl) = 1;
10121 DECL_RESULT (decl1) = resdecl;
10123 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
10126 /* Initialize RTL machinery. We cannot do this until
10127 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
10128 even when processing a template; this is how we get
10129 CFUN set up, and our per-function variables initialized.
10130 FIXME factor out the non-RTL stuff. */
10131 bl = current_binding_level;
10132 allocate_struct_function (decl1);
10133 current_binding_level = bl;
10135 /* Even though we're inside a function body, we still don't want to
10136 call expand_expr to calculate the size of a variable-sized array.
10137 We haven't necessarily assigned RTL to all variables yet, so it's
10138 not safe to try to expand expressions involving them. */
10139 cfun->x_dont_save_pending_sizes_p = 1;
10141 /* Start the statement-tree, start the tree now. */
10142 DECL_SAVED_TREE (decl1) = push_stmt_list ();
10144 /* Let the user know we're compiling this function. */
10145 announce_function (decl1);
10147 /* Record the decl so that the function name is defined.
10148 If we already have a decl for this name, and it is a FUNCTION_DECL,
10149 use the old decl. */
10150 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
10152 /* A specialization is not used to guide overload resolution. */
10153 if (!DECL_FUNCTION_MEMBER_P (decl1)
10154 && !(DECL_USE_TEMPLATE (decl1) &&
10155 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
10157 tree olddecl = pushdecl (decl1);
10159 if (olddecl == error_mark_node)
10160 /* If something went wrong when registering the declaration,
10161 use DECL1; we have to have a FUNCTION_DECL to use when
10162 parsing the body of the function. */
10165 /* Otherwise, OLDDECL is either a previous declaration of
10166 the same function or DECL1 itself. */
10171 /* We need to set the DECL_CONTEXT. */
10172 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
10173 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
10174 /* And make sure we have enough default args. */
10175 check_default_args (decl1);
10177 fntype = TREE_TYPE (decl1);
10180 /* Determine the ELF visibility attribute for the function. We must
10181 not do this before calling "pushdecl", as we must allow
10182 "duplicate_decls" to merge any attributes appropriately. */
10183 if (!DECL_CLONED_FUNCTION_P (decl1))
10184 determine_visibility (decl1);
10186 /* Reset these in case the call to pushdecl changed them. */
10187 current_function_decl = decl1;
10188 cfun->decl = decl1;
10190 /* If we are (erroneously) defining a function that we have already
10191 defined before, wipe out what we knew before. */
10192 if (!DECL_PENDING_INLINE_P (decl1))
10193 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
10195 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
10197 /* We know that this was set up by `grokclassfn'. We do not
10198 wait until `store_parm_decls', since evil parse errors may
10199 never get us to that point. Here we keep the consistency
10200 between `current_class_type' and `current_class_ptr'. */
10201 tree t = DECL_ARGUMENTS (decl1);
10203 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
10204 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
10206 cp_function_chain->x_current_class_ref
10207 = build_indirect_ref (t, NULL);
10208 cp_function_chain->x_current_class_ptr = t;
10210 /* Constructors and destructors need to know whether they're "in
10211 charge" of initializing virtual base classes. */
10212 t = TREE_CHAIN (t);
10213 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
10215 current_in_charge_parm = t;
10216 t = TREE_CHAIN (t);
10218 if (DECL_HAS_VTT_PARM_P (decl1))
10220 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
10221 current_vtt_parm = t;
10225 if (DECL_INTERFACE_KNOWN (decl1))
10227 tree ctx = decl_function_context (decl1);
10229 if (DECL_NOT_REALLY_EXTERN (decl1))
10230 DECL_EXTERNAL (decl1) = 0;
10232 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
10233 && TREE_PUBLIC (ctx))
10234 /* This is a function in a local class in an extern inline
10236 comdat_linkage (decl1);
10238 /* If this function belongs to an interface, it is public.
10239 If it belongs to someone else's interface, it is also external.
10240 This only affects inlines and template instantiations. */
10241 else if (finfo->interface_unknown == 0
10242 && ! DECL_TEMPLATE_INSTANTIATION (decl1))
10244 if (DECL_DECLARED_INLINE_P (decl1)
10245 || DECL_TEMPLATE_INSTANTIATION (decl1)
10246 || processing_template_decl)
10248 DECL_EXTERNAL (decl1)
10249 = (finfo->interface_only
10250 || (DECL_DECLARED_INLINE_P (decl1)
10251 && ! flag_implement_inlines
10252 && !DECL_VINDEX (decl1)));
10254 /* For WIN32 we also want to put these in linkonce sections. */
10255 maybe_make_one_only (decl1);
10258 DECL_EXTERNAL (decl1) = 0;
10259 DECL_NOT_REALLY_EXTERN (decl1) = 0;
10260 DECL_INTERFACE_KNOWN (decl1) = 1;
10261 /* If this function is in an interface implemented in this file,
10262 make sure that the backend knows to emit this function
10264 if (!DECL_EXTERNAL (decl1))
10265 mark_needed (decl1);
10267 else if (finfo->interface_unknown && finfo->interface_only
10268 && ! DECL_TEMPLATE_INSTANTIATION (decl1))
10270 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
10271 interface, we will have both finfo->interface_unknown and
10272 finfo->interface_only set. In that case, we don't want to
10273 use the normal heuristics because someone will supply a
10274 #pragma implementation elsewhere, and deducing it here would
10275 produce a conflict. */
10276 comdat_linkage (decl1);
10277 DECL_EXTERNAL (decl1) = 0;
10278 DECL_INTERFACE_KNOWN (decl1) = 1;
10279 DECL_DEFER_OUTPUT (decl1) = 1;
10283 /* This is a definition, not a reference.
10284 So clear DECL_EXTERNAL. */
10285 DECL_EXTERNAL (decl1) = 0;
10287 if ((DECL_DECLARED_INLINE_P (decl1)
10288 || DECL_TEMPLATE_INSTANTIATION (decl1))
10289 && ! DECL_INTERFACE_KNOWN (decl1)
10290 /* Don't try to defer nested functions for now. */
10291 && ! decl_function_context (decl1))
10292 DECL_DEFER_OUTPUT (decl1) = 1;
10294 DECL_INTERFACE_KNOWN (decl1) = 1;
10297 begin_scope (sk_function_parms, decl1);
10301 if (DECL_DESTRUCTOR_P (decl1)
10302 || (DECL_CONSTRUCTOR_P (decl1)
10303 && targetm.cxx.cdtor_returns_this ()))
10305 cdtor_label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
10306 DECL_CONTEXT (cdtor_label) = current_function_decl;
10309 start_fname_decls ();
10311 store_parm_decls (current_function_parms);
10315 /* Like start_preparsed_function, except that instead of a
10316 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
10318 Returns 1 on success. If the DECLARATOR is not suitable for a function
10319 (it defines a datum instead), we return 0, which tells
10320 yyparse to report a parse error. */
10323 start_function (cp_decl_specifier_seq *declspecs,
10324 const cp_declarator *declarator,
10329 if (have_extern_spec)
10331 declspecs->storage_class = sc_extern;
10332 /* This should only be done once on the outermost decl. */
10333 have_extern_spec = false;
10336 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
10337 /* If the declarator is not suitable for a function definition,
10338 cause a syntax error. */
10339 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
10342 /* If #pragma weak was used, mark the decl weak now. */
10343 if (global_scope_p (current_binding_level))
10344 maybe_apply_pragma_weak (decl1);
10346 if (DECL_MAIN_P (decl1))
10347 /* main must return int. grokfndecl should have corrected it
10348 (and issued a diagnostic) if the user got it wrong. */
10349 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
10350 integer_type_node));
10352 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
10357 /* Store the parameter declarations into the current function declaration.
10358 This is called after parsing the parameter declarations, before
10359 digesting the body of the function.
10361 Also install to binding contour return value identifier, if any. */
10364 store_parm_decls (tree current_function_parms)
10366 tree fndecl = current_function_decl;
10369 /* This is a chain of any other decls that came in among the parm
10370 declarations. If a parm is declared with enum {foo, bar} x;
10371 then CONST_DECLs for foo and bar are put here. */
10372 tree nonparms = NULL_TREE;
10374 if (current_function_parms)
10376 /* This case is when the function was defined with an ANSI prototype.
10377 The parms already have decls, so we need not do anything here
10378 except record them as in effect
10379 and complain if any redundant old-style parm decls were written. */
10381 tree specparms = current_function_parms;
10384 /* Must clear this because it might contain TYPE_DECLs declared
10386 current_binding_level->names = NULL;
10388 /* If we're doing semantic analysis, then we'll call pushdecl
10389 for each of these. We must do them in reverse order so that
10390 they end in the correct forward order. */
10391 specparms = nreverse (specparms);
10393 for (parm = specparms; parm; parm = next)
10395 next = TREE_CHAIN (parm);
10396 if (TREE_CODE (parm) == PARM_DECL)
10398 if (DECL_NAME (parm) == NULL_TREE
10399 || TREE_CODE (parm) != VOID_TYPE)
10402 error ("parameter %qD declared void", parm);
10406 /* If we find an enum constant or a type tag,
10407 put it aside for the moment. */
10408 TREE_CHAIN (parm) = NULL_TREE;
10409 nonparms = chainon (nonparms, parm);
10413 /* Get the decls in their original chain order and record in the
10414 function. This is all and only the PARM_DECLs that were
10415 pushed into scope by the loop above. */
10416 DECL_ARGUMENTS (fndecl) = getdecls ();
10419 DECL_ARGUMENTS (fndecl) = NULL_TREE;
10421 /* Now store the final chain of decls for the arguments
10422 as the decl-chain of the current lexical scope.
10423 Put the enumerators in as well, at the front so that
10424 DECL_ARGUMENTS is not modified. */
10425 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
10427 /* For a cloned function, we've already got all the code we need;
10428 there's no need to add any extra bits. */
10429 if (!DECL_CLONED_FUNCTION_P (fndecl))
10431 /* Do the starting of the exception specifications, if we have any. */
10432 if (flag_exceptions && !processing_template_decl
10433 && flag_enforce_eh_specs
10434 && TYPE_RAISES_EXCEPTIONS (TREE_TYPE (current_function_decl)))
10435 current_eh_spec_block = begin_eh_spec_block ();
10440 /* We have finished doing semantic analysis on DECL, but have not yet
10441 generated RTL for its body. Save away our current state, so that
10442 when we want to generate RTL later we know what to do. */
10445 save_function_data (tree decl)
10447 struct language_function *f;
10449 /* Save the language-specific per-function data so that we can
10450 get it back when we really expand this function. */
10451 gcc_assert (!DECL_PENDING_INLINE_P (decl));
10454 f = GGC_NEW (struct language_function);
10455 memcpy (f, cp_function_chain, sizeof (struct language_function));
10456 DECL_SAVED_FUNCTION_DATA (decl) = f;
10458 /* Clear out the bits we don't need. */
10459 f->base.x_stmt_tree.x_cur_stmt_list = NULL_TREE;
10460 f->x_named_label_uses = NULL;
10461 f->bindings = NULL;
10462 f->x_local_names = NULL;
10466 /* Set the return value of the constructor (if present). */
10469 finish_constructor_body (void)
10474 if (targetm.cxx.cdtor_returns_this ())
10476 /* Any return from a constructor will end up here. */
10477 add_stmt (build_stmt (LABEL_EXPR, cdtor_label));
10479 val = DECL_ARGUMENTS (current_function_decl);
10480 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
10481 DECL_RESULT (current_function_decl), val);
10482 /* Return the address of the object. */
10483 exprstmt = build_stmt (RETURN_EXPR, val);
10484 add_stmt (exprstmt);
10488 /* Do all the processing for the beginning of a destructor; set up the
10489 vtable pointers and cleanups for bases and members. */
10492 begin_destructor_body (void)
10495 tree compound_stmt;
10497 /* If the dtor is empty, and we know there is not any possible
10498 way we could use any vtable entries, before they are possibly
10499 set by a base class dtor, we don't have to setup the vtables,
10500 as we know that any base class dtor will set up any vtables
10501 it needs. We avoid MI, because one base class dtor can do a
10502 virtual dispatch to an overridden function that would need to
10503 have a non-related vtable set up, we cannot avoid setting up
10504 vtables in that case. We could change this to see if there
10505 is just one vtable.
10507 ??? In the destructor for a class, the vtables are set
10508 appropriately for that class. There will be no non-related
10509 vtables. jason 2001-12-11. */
10510 if_stmt = begin_if_stmt ();
10512 /* If it is not safe to avoid setting up the vtables, then
10513 someone will change the condition to be boolean_true_node.
10514 (Actually, for now, we do not have code to set the condition
10515 appropriately, so we just assume that we always need to
10516 initialize the vtables.) */
10517 finish_if_stmt_cond (boolean_true_node, if_stmt);
10519 compound_stmt = begin_compound_stmt (0);
10521 /* Make all virtual function table pointers in non-virtual base
10522 classes point to CURRENT_CLASS_TYPE's virtual function
10524 initialize_vtbl_ptrs (current_class_ptr);
10526 finish_compound_stmt (compound_stmt);
10527 finish_then_clause (if_stmt);
10528 finish_if_stmt (if_stmt);
10530 /* And insert cleanups for our bases and members so that they
10531 will be properly destroyed if we throw. */
10532 push_base_cleanups ();
10535 /* At the end of every destructor we generate code to delete the object if
10536 necessary. Do that now. */
10539 finish_destructor_body (void)
10543 /* Any return from a destructor will end up here; that way all base
10544 and member cleanups will be run when the function returns. */
10545 add_stmt (build_stmt (LABEL_EXPR, cdtor_label));
10547 /* In a virtual destructor, we must call delete. */
10548 if (DECL_VIRTUAL_P (current_function_decl))
10551 tree virtual_size = cxx_sizeof (current_class_type);
10555 At the point of definition of a virtual destructor (including
10556 an implicit definition), non-placement operator delete shall
10557 be looked up in the scope of the destructor's class and if
10558 found shall be accessible and unambiguous. */
10559 exprstmt = build_op_delete_call
10560 (DELETE_EXPR, current_class_ptr, virtual_size,
10561 /*global_p=*/false, NULL_TREE);
10563 if_stmt = begin_if_stmt ();
10564 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
10565 current_in_charge_parm,
10568 finish_expr_stmt (exprstmt);
10569 finish_then_clause (if_stmt);
10570 finish_if_stmt (if_stmt);
10573 if (targetm.cxx.cdtor_returns_this ())
10577 val = DECL_ARGUMENTS (current_function_decl);
10578 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
10579 DECL_RESULT (current_function_decl), val);
10580 /* Return the address of the object. */
10581 exprstmt = build_stmt (RETURN_EXPR, val);
10582 add_stmt (exprstmt);
10586 /* Do the necessary processing for the beginning of a function body, which
10587 in this case includes member-initializers, but not the catch clauses of
10588 a function-try-block. Currently, this means opening a binding level
10589 for the member-initializers (in a ctor) and member cleanups (in a dtor).
10590 In other functions, this isn't necessary, but it doesn't hurt. */
10593 begin_function_body (void)
10597 if (processing_template_decl)
10598 /* Do nothing now. */;
10600 /* Always keep the BLOCK node associated with the outermost pair of
10601 curly braces of a function. These are needed for correct
10602 operation of dwarfout.c. */
10603 keep_next_level (true);
10605 stmt = begin_compound_stmt (BCS_FN_BODY);
10607 if (processing_template_decl)
10608 /* Do nothing now. */;
10609 else if (DECL_DESTRUCTOR_P (current_function_decl))
10610 begin_destructor_body ();
10615 /* Do the processing for the end of a function body. Currently, this means
10616 closing out the cleanups for fully-constructed bases and members, and in
10617 the case of the destructor, deleting the object if desired. Again, this
10618 is only meaningful for [cd]tors, since they are the only functions where
10619 there is a significant distinction between the main body and any
10620 function catch clauses. Handling, say, main() return semantics here
10621 would be wrong, as flowing off the end of a function catch clause for
10622 main() would also need to return 0. */
10625 finish_function_body (tree compstmt)
10627 /* Close the block. */
10628 finish_compound_stmt (compstmt);
10630 if (processing_template_decl)
10631 /* Do nothing now. */;
10632 else if (DECL_CONSTRUCTOR_P (current_function_decl))
10633 finish_constructor_body ();
10634 else if (DECL_DESTRUCTOR_P (current_function_decl))
10635 finish_destructor_body ();
10638 /* Finish up a function declaration and compile that function
10639 all the way to assembler language output. The free the storage
10640 for the function definition.
10642 FLAGS is a bitwise or of the following values:
10644 We just finished processing the body of an in-class inline
10645 function definition. (This processing will have taken place
10646 after the class definition is complete.) */
10649 finish_function (int flags)
10651 tree fndecl = current_function_decl;
10652 tree fntype, ctype = NULL_TREE;
10653 int inclass_inline = (flags & 2) != 0;
10656 /* When we get some parse errors, we can end up without a
10657 current_function_decl, so cope. */
10658 if (fndecl == NULL_TREE)
10659 return error_mark_node;
10661 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
10662 && DECL_VIRTUAL_P (fndecl)
10663 && !processing_template_decl)
10665 tree fnclass = DECL_CONTEXT (fndecl);
10666 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
10667 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
10670 nested = function_depth > 1;
10671 fntype = TREE_TYPE (fndecl);
10673 /* TREE_READONLY (fndecl) = 1;
10674 This caused &foo to be of type ptr-to-const-function
10675 which then got a warning when stored in a ptr-to-function variable. */
10677 gcc_assert (building_stmt_tree ());
10679 /* For a cloned function, we've already got all the code we need;
10680 there's no need to add any extra bits. */
10681 if (!DECL_CLONED_FUNCTION_P (fndecl))
10683 if (DECL_MAIN_P (current_function_decl))
10687 /* Make it so that `main' always returns 0 by default (or
10690 stmt = finish_return_stmt (integer_one_node);
10692 stmt = finish_return_stmt (integer_zero_node);
10694 /* Hack. We don't want the middle-end to warn that this
10695 return is unreachable, so put the statement on the
10697 #ifdef USE_MAPPED_LOCATION
10698 SET_EXPR_LOCATION (stmt, UNKNOWN_LOCATION);
10700 annotate_with_file_line (stmt, input_filename, 0);
10704 /* Finish dealing with exception specifiers. */
10705 if (flag_exceptions && !processing_template_decl
10706 && flag_enforce_eh_specs
10707 && TYPE_RAISES_EXCEPTIONS (TREE_TYPE (current_function_decl)))
10708 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
10709 (TREE_TYPE (current_function_decl)),
10710 current_eh_spec_block);
10713 /* If we're saving up tree structure, tie off the function now. */
10714 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
10716 finish_fname_decls ();
10718 /* If this function can't throw any exceptions, remember that. */
10719 if (!processing_template_decl
10720 && !cp_function_chain->can_throw
10721 && !flag_non_call_exceptions)
10722 TREE_NOTHROW (fndecl) = 1;
10724 /* This must come after expand_function_end because cleanups might
10725 have declarations (from inline functions) that need to go into
10726 this function's blocks. */
10728 /* If the current binding level isn't the outermost binding level
10729 for this function, either there is a bug, or we have experienced
10730 syntax errors and the statement tree is malformed. */
10731 if (current_binding_level->kind != sk_function_parms)
10733 /* Make sure we have already experienced errors. */
10734 gcc_assert (errorcount);
10736 /* Throw away the broken statement tree and extra binding
10738 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
10740 while (current_binding_level->kind != sk_function_parms)
10742 if (current_binding_level->kind == sk_class)
10743 pop_nested_class ();
10745 poplevel (0, 0, 0);
10748 poplevel (1, 0, 1);
10750 /* Statements should always be full-expressions at the outermost set
10751 of curly braces for a function. */
10752 gcc_assert (stmts_are_full_exprs_p ());
10754 /* Set up the named return value optimization, if we can. Candidate
10755 variables are selected in check_return_value. */
10756 if (current_function_return_value)
10758 tree r = current_function_return_value;
10761 if (r != error_mark_node
10762 /* This is only worth doing for fns that return in memory--and
10763 simpler, since we don't have to worry about promoted modes. */
10764 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
10765 /* Only allow this for variables declared in the outer scope of
10766 the function so we know that their lifetime always ends with a
10767 return; see g++.dg/opt/nrv6.C. We could be more flexible if
10768 we were to do this optimization in tree-ssa. */
10769 && (outer = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl)))
10770 /* Skip the artificial function body block. */
10771 && (outer = BLOCK_SUBBLOCKS (outer))
10772 && chain_member (r, BLOCK_VARS (outer)))
10773 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
10775 current_function_return_value = NULL_TREE;
10778 /* Remember that we were in class scope. */
10779 if (current_class_name)
10780 ctype = current_class_type;
10782 /* Must mark the RESULT_DECL as being in this function. */
10783 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
10785 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
10786 to the FUNCTION_DECL node itself. */
10787 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
10789 /* Save away current state, if appropriate. */
10790 if (!processing_template_decl)
10791 save_function_data (fndecl);
10793 /* Complain if there's just no return statement. */
10794 if (warn_return_type
10795 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
10796 && !dependent_type_p (TREE_TYPE (fntype))
10797 && !current_function_returns_value && !current_function_returns_null
10798 /* Don't complain if we abort or throw. */
10799 && !current_function_returns_abnormally
10800 && !DECL_NAME (DECL_RESULT (fndecl))
10801 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
10802 inline function, as we might never be compiled separately. */
10803 && (DECL_INLINE (fndecl) || processing_template_decl)
10804 /* Structor return values (if any) are set by the compiler. */
10805 && !DECL_CONSTRUCTOR_P (fndecl)
10806 && !DECL_DESTRUCTOR_P (fndecl))
10807 warning (0, "no return statement in function returning non-void");
10809 /* Store the end of the function, so that we get good line number
10810 info for the epilogue. */
10811 cfun->function_end_locus = input_location;
10813 /* Genericize before inlining. */
10814 if (!processing_template_decl)
10816 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
10817 cp_genericize (fndecl);
10818 /* Clear out the bits we don't need. */
10819 f->x_current_class_ptr = NULL;
10820 f->x_current_class_ref = NULL;
10821 f->x_eh_spec_block = NULL;
10822 f->x_in_charge_parm = NULL;
10823 f->x_vtt_parm = NULL;
10824 f->x_return_value = NULL;
10825 f->bindings = NULL;
10827 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
10828 c_warn_unused_result (&DECL_SAVED_TREE (fndecl));
10830 /* Clear out the bits we don't need. */
10831 local_names = NULL;
10832 named_label_uses = NULL;
10834 /* We're leaving the context of this function, so zap cfun. It's still in
10835 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
10837 current_function_decl = NULL;
10839 /* If this is an in-class inline definition, we may have to pop the
10840 bindings for the template parameters that we added in
10841 maybe_begin_member_template_processing when start_function was
10843 if (inclass_inline)
10844 maybe_end_member_template_processing ();
10846 /* Leave the scope of the class. */
10848 pop_nested_class ();
10854 /* Let the error reporting routines know that we're outside a
10855 function. For a nested function, this value is used in
10856 cxx_pop_function_context and then reset via pop_function_context. */
10857 current_function_decl = NULL_TREE;
10862 /* Create the FUNCTION_DECL for a function definition.
10863 DECLSPECS and DECLARATOR are the parts of the declaration;
10864 they describe the return type and the name of the function,
10865 but twisted together in a fashion that parallels the syntax of C.
10867 This function creates a binding context for the function body
10868 as well as setting up the FUNCTION_DECL in current_function_decl.
10870 Returns a FUNCTION_DECL on success.
10872 If the DECLARATOR is not suitable for a function (it defines a datum
10873 instead), we return 0, which tells yyparse to report a parse error.
10875 May return void_type_node indicating that this method is actually
10876 a friend. See grokfield for more details.
10878 Came here with a `.pushlevel' .
10880 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
10881 CHANGES TO CODE IN `grokfield'. */
10884 start_method (cp_decl_specifier_seq *declspecs,
10885 const cp_declarator *declarator, tree attrlist)
10887 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
10890 if (fndecl == error_mark_node)
10891 return error_mark_node;
10893 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
10895 error ("invalid member function declaration");
10896 return error_mark_node;
10900 cplus_decl_attributes (&fndecl, attrlist, 0);
10902 /* Pass friends other than inline friend functions back. */
10903 if (fndecl == void_type_node)
10906 if (DECL_IN_AGGR_P (fndecl))
10908 if (DECL_CONTEXT (fndecl)
10909 && TREE_CODE( DECL_CONTEXT (fndecl)) != NAMESPACE_DECL)
10910 error ("%qD is already defined in class %qT", fndecl,
10911 DECL_CONTEXT (fndecl));
10912 return void_type_node;
10915 check_template_shadow (fndecl);
10917 DECL_DECLARED_INLINE_P (fndecl) = 1;
10918 if (flag_default_inline)
10919 DECL_INLINE (fndecl) = 1;
10921 /* We process method specializations in finish_struct_1. */
10922 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
10924 fndecl = push_template_decl (fndecl);
10925 if (fndecl == error_mark_node)
10929 if (! DECL_FRIEND_P (fndecl))
10931 if (TREE_CHAIN (fndecl))
10933 fndecl = copy_node (fndecl);
10934 TREE_CHAIN (fndecl) = NULL_TREE;
10936 grok_special_member_properties (fndecl);
10939 cp_finish_decl (fndecl, NULL_TREE, NULL_TREE, 0);
10941 /* Make a place for the parms. */
10942 begin_scope (sk_function_parms, fndecl);
10944 DECL_IN_AGGR_P (fndecl) = 1;
10948 /* Go through the motions of finishing a function definition.
10949 We don't compile this method until after the whole class has
10952 FINISH_METHOD must return something that looks as though it
10953 came from GROKFIELD (since we are defining a method, after all).
10955 This is called after parsing the body of the function definition.
10956 STMTS is the chain of statements that makes up the function body.
10958 DECL is the ..._DECL that `start_method' provided. */
10961 finish_method (tree decl)
10963 tree fndecl = decl;
10968 if (decl == void_type_node)
10971 old_initial = DECL_INITIAL (fndecl);
10973 /* Undo the level for the parms (from start_method).
10974 This is like poplevel, but it causes nothing to be
10975 saved. Saving information here confuses symbol-table
10976 output routines. Besides, this information will
10977 be correctly output when this method is actually
10980 /* Clear out the meanings of the local variables of this level;
10981 also record in each decl which block it belongs to. */
10983 for (link = current_binding_level->names; link; link = TREE_CHAIN (link))
10985 if (DECL_NAME (link) != NULL_TREE)
10986 pop_binding (DECL_NAME (link), link);
10987 gcc_assert (TREE_CODE (link) != FUNCTION_DECL);
10988 DECL_CONTEXT (link) = NULL_TREE;
10991 poplevel (0, 0, 0);
10993 DECL_INITIAL (fndecl) = old_initial;
10995 /* We used to check if the context of FNDECL was different from
10996 current_class_type as another way to get inside here. This didn't work
10997 for String.cc in libg++. */
10998 if (DECL_FRIEND_P (fndecl))
11000 VEC_safe_push (tree, gc, CLASSTYPE_INLINE_FRIENDS (current_class_type),
11002 decl = void_type_node;
11009 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
11010 we can lay it out later, when and if its type becomes complete. */
11013 maybe_register_incomplete_var (tree var)
11015 gcc_assert (TREE_CODE (var) == VAR_DECL);
11017 /* Keep track of variables with incomplete types. */
11018 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
11019 && DECL_EXTERNAL (var))
11021 tree inner_type = TREE_TYPE (var);
11023 while (TREE_CODE (inner_type) == ARRAY_TYPE)
11024 inner_type = TREE_TYPE (inner_type);
11025 inner_type = TYPE_MAIN_VARIANT (inner_type);
11027 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
11028 /* RTTI TD entries are created while defining the type_info. */
11029 || (TYPE_LANG_SPECIFIC (inner_type)
11030 && TYPE_BEING_DEFINED (inner_type)))
11031 incomplete_vars = tree_cons (inner_type, var, incomplete_vars);
11035 /* Called when a class type (given by TYPE) is defined. If there are
11036 any existing VAR_DECLs whose type hsa been completed by this
11037 declaration, update them now. */
11040 complete_vars (tree type)
11042 tree *list = &incomplete_vars;
11044 gcc_assert (CLASS_TYPE_P (type));
11047 if (same_type_p (type, TREE_PURPOSE (*list)))
11049 tree var = TREE_VALUE (*list);
11050 tree type = TREE_TYPE (var);
11051 /* Complete the type of the variable. The VAR_DECL itself
11052 will be laid out in expand_expr. */
11053 complete_type (type);
11054 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
11055 /* Remove this entry from the list. */
11056 *list = TREE_CHAIN (*list);
11059 list = &TREE_CHAIN (*list);
11062 /* Check for pending declarations which may have abstract type. */
11063 complete_type_check_abstract (type);
11066 /* If DECL is of a type which needs a cleanup, build that cleanup
11070 cxx_maybe_build_cleanup (tree decl)
11072 tree type = TREE_TYPE (decl);
11074 if (type != error_mark_node && TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
11076 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
11078 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
11079 && CLASSTYPE_VBASECLASSES (type));
11081 if (TREE_CODE (type) == ARRAY_TYPE)
11085 cxx_mark_addressable (decl);
11086 rval = build_unary_op (ADDR_EXPR, decl, 0);
11089 /* Optimize for space over speed here. */
11090 if (!has_vbases || flag_expensive_optimizations)
11091 flags |= LOOKUP_NONVIRTUAL;
11093 rval = build_delete (TREE_TYPE (rval), rval,
11094 sfk_complete_destructor, flags, 0);
11101 /* When a stmt has been parsed, this function is called. */
11108 /* DECL was originally constructed as a non-static member function,
11109 but turned out to be static. Update it accordingly. */
11112 revert_static_member_fn (tree decl)
11115 tree function = TREE_TYPE (decl);
11116 tree args = TYPE_ARG_TYPES (function);
11118 if (cp_type_quals (TREE_TYPE (TREE_VALUE (args)))
11119 != TYPE_UNQUALIFIED)
11120 error ("static member function %q#D declared with type qualifiers", decl);
11122 args = TREE_CHAIN (args);
11123 tmp = build_function_type (TREE_TYPE (function), args);
11124 tmp = build_qualified_type (tmp, cp_type_quals (function));
11125 tmp = build_exception_variant (tmp,
11126 TYPE_RAISES_EXCEPTIONS (function));
11127 TREE_TYPE (decl) = tmp;
11128 if (DECL_ARGUMENTS (decl))
11129 DECL_ARGUMENTS (decl) = TREE_CHAIN (DECL_ARGUMENTS (decl));
11130 DECL_STATIC_FUNCTION_P (decl) = 1;
11133 /* Initialize the variables used during compilation of a C++
11137 cxx_push_function_context (struct function * f)
11139 struct language_function *p = GGC_CNEW (struct language_function);
11142 /* Whenever we start a new function, we destroy temporaries in the
11144 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
11150 if (DECL_SAVED_FUNCTION_DATA (fn))
11152 /* If we already parsed this function, and we're just expanding it
11153 now, restore saved state. */
11154 *cp_function_chain = *DECL_SAVED_FUNCTION_DATA (fn);
11156 /* We don't need the saved data anymore. Unless this is an inline
11157 function; we need the named return value info for
11158 declare_return_variable. */
11159 if (! DECL_INLINE (fn))
11160 DECL_SAVED_FUNCTION_DATA (fn) = NULL;
11165 /* Free the language-specific parts of F, now that we've finished
11166 compiling the function. */
11169 cxx_pop_function_context (struct function * f)
11174 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
11175 one of the language-independent trees. */
11177 enum cp_tree_node_structure_enum
11178 cp_tree_node_structure (union lang_tree_node * t)
11180 switch (TREE_CODE (&t->generic))
11182 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
11183 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
11184 case OVERLOAD: return TS_CP_OVERLOAD;
11185 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
11186 case TINST_LEVEL: return TS_CP_TINST_LEVEL;
11187 case PTRMEM_CST: return TS_CP_PTRMEM;
11188 case BASELINK: return TS_CP_BASELINK;
11189 default: return TS_CP_GENERIC;
11193 /* Build the void_list_node (void_type_node having been created). */
11195 build_void_list_node (void)
11197 tree t = build_tree_list (NULL_TREE, void_type_node);
11202 cp_missing_noreturn_ok_p (tree decl)
11204 /* A missing noreturn is ok for the `main' function. */
11205 return DECL_MAIN_P (decl);
11208 /* Return the COMDAT group into which DECL should be placed. */
11211 cxx_comdat_group (tree decl)
11215 /* Virtual tables, construction virtual tables, and virtual table
11216 tables all go in a single COMDAT group, named after the primary
11218 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
11219 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
11220 /* For all other DECLs, the COMDAT group is the mangled name of the
11221 declaration itself. */
11224 while (DECL_THUNK_P (decl))
11226 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
11227 into the same section as the target function. In that case
11228 we must return target's name. */
11229 tree target = THUNK_TARGET (decl);
11230 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
11231 && DECL_SECTION_NAME (target) != NULL
11232 && DECL_ONE_ONLY (target))
11237 name = DECL_ASSEMBLER_NAME (decl);
11240 return IDENTIFIER_POINTER (name);
11243 #include "gt-cp-decl.h"