1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
4 Contributed by Michael Tiemann (tiemann@cygnus.com)
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2, or (at your option)
13 GCC is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING. If not, write to
20 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
21 Boston, MA 02110-1301, USA. */
24 /* Process declarations and symbol lookup for C++ front end.
25 Also constructs types; the standard scalar types at initialization,
26 and structure, union, array and enum types when they are declared. */
28 /* ??? not all decl nodes are given the most useful possible
29 line numbers. For example, the CONST_DECLs for enum values. */
33 #include "coretypes.h"
40 #include "tree-inline.h"
50 #include "diagnostic.h"
53 #include "tree-flow.h"
55 static tree grokparms (cp_parameter_declarator *, tree *);
56 static const char *redeclaration_error_message (tree, tree);
58 static int decl_jump_unsafe (tree);
59 static void require_complete_types_for_parms (tree);
60 static int ambi_op_p (enum tree_code);
61 static int unary_op_p (enum tree_code);
62 static void push_local_name (tree);
63 static tree grok_reference_init (tree, tree, tree, tree *);
64 static tree grokvardecl (tree, tree, const cp_decl_specifier_seq *,
66 static void record_unknown_type (tree, const char *);
67 static tree builtin_function_1 (const char *, tree, tree,
68 enum built_in_function code,
69 enum built_in_class cl, const char *,
71 static tree build_library_fn_1 (tree, enum tree_code, tree);
72 static int member_function_or_else (tree, tree, enum overload_flags);
73 static void bad_specifiers (tree, const char *, int, int, int, int,
75 static void check_for_uninitialized_const_var (tree);
76 static hashval_t typename_hash (const void *);
77 static int typename_compare (const void *, const void *);
78 static tree local_variable_p_walkfn (tree *, int *, void *);
79 static tree record_builtin_java_type (const char *, int);
80 static const char *tag_name (enum tag_types);
81 static tree lookup_and_check_tag (enum tag_types, tree, tag_scope, bool);
82 static int walk_namespaces_r (tree, walk_namespaces_fn, void *);
83 static tree make_label_decl (tree, int);
84 static void use_label (tree);
85 static void check_previous_goto_1 (tree, struct cp_binding_level *, tree,
87 static void check_previous_goto (struct named_label_use_list *);
88 static void check_switch_goto (struct cp_binding_level *);
89 static void check_previous_gotos (tree);
90 static void pop_label (tree, tree);
91 static void pop_labels (tree);
92 static void maybe_deduce_size_from_array_init (tree, tree);
93 static void layout_var_decl (tree);
94 static void maybe_commonize_var (tree);
95 static tree check_initializer (tree, tree, int, tree *);
96 static void make_rtl_for_nonlocal_decl (tree, tree, const char *);
97 static void save_function_data (tree);
98 static void check_function_type (tree, tree);
99 static void finish_constructor_body (void);
100 static void begin_destructor_body (void);
101 static void finish_destructor_body (void);
102 static tree create_array_type_for_decl (tree, tree, tree);
103 static tree get_atexit_node (void);
104 static tree get_dso_handle_node (void);
105 static tree start_cleanup_fn (void);
106 static void end_cleanup_fn (void);
107 static tree cp_make_fname_decl (tree, int);
108 static void initialize_predefined_identifiers (void);
109 static tree check_special_function_return_type
110 (special_function_kind, tree, tree);
111 static tree push_cp_library_fn (enum tree_code, tree);
112 static tree build_cp_library_fn (tree, enum tree_code, tree);
113 static void store_parm_decls (tree);
114 static void initialize_local_var (tree, tree);
115 static void expand_static_init (tree, tree);
116 static tree next_initializable_field (tree);
117 static tree reshape_init (tree, tree);
119 /* Erroneous argument lists can use this *IFF* they do not modify it. */
120 tree error_mark_list;
122 /* The following symbols are subsumed in the cp_global_trees array, and
123 listed here individually for documentation purposes.
126 tree wchar_decl_node;
128 tree vtable_entry_type;
129 tree delta_type_node;
130 tree __t_desc_type_node;
132 tree class_type_node;
133 tree unknown_type_node;
135 Array type `vtable_entry_type[]'
138 tree vtbl_ptr_type_node;
145 A FUNCTION_DECL which can call `abort'. Not necessarily the
146 one that the user will declare, but sufficient to be called
147 by routines that want to abort the program.
151 The FUNCTION_DECL for the default `::operator delete'.
153 tree global_delete_fndecl;
156 tree type_info_type_node, tinfo_decl_id, tinfo_decl_type;
161 tree cp_global_trees[CPTI_MAX];
163 /* Indicates that there is a type value in some namespace, although
164 that is not necessarily in scope at the moment. */
166 tree global_type_node;
168 /* The node that holds the "name" of the global scope. */
169 tree global_scope_name;
171 /* Used only for jumps to as-yet undefined labels, since jumps to
172 defined labels can have their validity checked immediately. */
174 struct named_label_use_list GTY(())
176 struct cp_binding_level *binding_level;
179 location_t o_goto_locus;
180 struct named_label_use_list *next;
183 #define named_label_uses cp_function_chain->x_named_label_uses
185 #define local_names cp_function_chain->x_local_names
187 /* A list of objects which have constructors or destructors
188 which reside in the global scope. The decl is stored in
189 the TREE_VALUE slot and the initializer is stored
190 in the TREE_PURPOSE slot. */
191 tree static_aggregates;
195 /* A node for the integer constants 2, and 3. */
197 tree integer_two_node, integer_three_node;
199 /* A list of all LABEL_DECLs in the function that have names. Here so
200 we can clear out their names' definitions at the end of the
201 function, and so we can check the validity of jumps to these labels. */
203 struct named_label_list GTY(())
205 struct cp_binding_level *binding_level;
210 struct named_label_list *next;
211 unsigned int in_try_scope : 1;
212 unsigned int in_catch_scope : 1;
215 #define named_labels cp_function_chain->x_named_labels
217 /* The number of function bodies which we are currently processing.
218 (Zero if we are at namespace scope, one inside the body of a
219 function, two inside the body of a function in a local class, etc.) */
222 /* States indicating how grokdeclarator() should handle declspecs marked
223 with __attribute__((deprecated)). An object declared as
224 __attribute__((deprecated)) suppresses warnings of uses of other
227 enum deprecated_states {
232 static enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
234 /* True if a declaration with an `extern' linkage specifier is being
236 bool have_extern_spec;
239 /* A TREE_LIST of VAR_DECLs. The TREE_PURPOSE is a RECORD_TYPE or
240 UNION_TYPE; the TREE_VALUE is a VAR_DECL with that type. At the
241 time the VAR_DECL was declared, the type was incomplete. */
243 static GTY(()) tree incomplete_vars;
245 /* Returns the kind of template specialization we are currently
246 processing, given that it's declaration contained N_CLASS_SCOPES
247 explicit scope qualifications. */
250 current_tmpl_spec_kind (int n_class_scopes)
252 int n_template_parm_scopes = 0;
253 int seen_specialization_p = 0;
254 int innermost_specialization_p = 0;
255 struct cp_binding_level *b;
257 /* Scan through the template parameter scopes. */
258 for (b = current_binding_level;
259 b->kind == sk_template_parms;
262 /* If we see a specialization scope inside a parameter scope,
263 then something is wrong. That corresponds to a declaration
266 template <class T> template <> ...
268 which is always invalid since [temp.expl.spec] forbids the
269 specialization of a class member template if the enclosing
270 class templates are not explicitly specialized as well. */
271 if (b->explicit_spec_p)
273 if (n_template_parm_scopes == 0)
274 innermost_specialization_p = 1;
276 seen_specialization_p = 1;
278 else if (seen_specialization_p == 1)
279 return tsk_invalid_member_spec;
281 ++n_template_parm_scopes;
284 /* Handle explicit instantiations. */
285 if (processing_explicit_instantiation)
287 if (n_template_parm_scopes != 0)
288 /* We've seen a template parameter list during an explicit
289 instantiation. For example:
291 template <class T> template void f(int);
293 This is erroneous. */
294 return tsk_invalid_expl_inst;
296 return tsk_expl_inst;
299 if (n_template_parm_scopes < n_class_scopes)
300 /* We've not seen enough template headers to match all the
301 specialized classes present. For example:
303 template <class T> void R<T>::S<T>::f(int);
305 This is invalid; there needs to be one set of template
306 parameters for each class. */
307 return tsk_insufficient_parms;
308 else if (n_template_parm_scopes == n_class_scopes)
309 /* We're processing a non-template declaration (even though it may
310 be a member of a template class.) For example:
312 template <class T> void S<T>::f(int);
314 The `class T' maches the `S<T>', leaving no template headers
315 corresponding to the `f'. */
317 else if (n_template_parm_scopes > n_class_scopes + 1)
318 /* We've got too many template headers. For example:
320 template <> template <class T> void f (T);
322 There need to be more enclosing classes. */
323 return tsk_excessive_parms;
325 /* This must be a template. It's of the form:
327 template <class T> template <class U> void S<T>::f(U);
329 This is a specialization if the innermost level was a
330 specialization; otherwise it's just a definition of the
332 return innermost_specialization_p ? tsk_expl_spec : tsk_template;
335 /* Exit the current scope. */
343 /* When a label goes out of scope, check to see if that label was used
344 in a valid manner, and issue any appropriate warnings or errors. */
347 pop_label (tree label, tree old_value)
349 if (!processing_template_decl)
351 if (DECL_INITIAL (label) == NULL_TREE)
355 error ("label %q+D used but not defined", label);
356 #ifdef USE_MAPPED_LOCATION
357 location = input_location; /* FIXME want (input_filename, (line)0) */
359 location.file = input_filename;
362 /* Avoid crashing later. */
363 define_label (location, DECL_NAME (label));
365 else if (warn_unused_label && !TREE_USED (label))
366 warning (0, "label %q+D defined but not used", label);
369 SET_IDENTIFIER_LABEL_VALUE (DECL_NAME (label), old_value);
372 /* At the end of a function, all labels declared within the function
373 go out of scope. BLOCK is the top-level block for the
377 pop_labels (tree block)
379 struct named_label_list *link;
381 /* Clear out the definitions of all label names, since their scopes
383 for (link = named_labels; link; link = link->next)
385 pop_label (link->label_decl, link->old_value);
386 /* Put the labels into the "variables" of the top-level block,
387 so debugger can see them. */
388 TREE_CHAIN (link->label_decl) = BLOCK_VARS (block);
389 BLOCK_VARS (block) = link->label_decl;
395 /* The following two routines are used to interface to Objective-C++.
396 The binding level is purposely treated as an opaque type. */
399 objc_get_current_scope (void)
401 return current_binding_level;
404 /* The following routine is used by the NeXT-style SJLJ exceptions;
405 variables get marked 'volatile' so as to not be clobbered by
406 _setjmp()/_longjmp() calls. All variables in the current scope,
407 as well as parent scopes up to (but not including) ENCLOSING_BLK
408 shall be thusly marked. */
411 objc_mark_locals_volatile (void *enclosing_blk)
413 struct cp_binding_level *scope;
415 for (scope = current_binding_level;
416 scope && scope != enclosing_blk;
417 scope = scope->level_chain)
421 for (decl = scope->names; decl; decl = TREE_CHAIN (decl))
422 objc_volatilize_decl (decl);
424 /* Do not climb up past the current function. */
425 if (scope->kind == sk_function_parms)
430 /* Exit a binding level.
431 Pop the level off, and restore the state of the identifier-decl mappings
432 that were in effect when this level was entered.
434 If KEEP == 1, this level had explicit declarations, so
435 and create a "block" (a BLOCK node) for the level
436 to record its declarations and subblocks for symbol table output.
438 If FUNCTIONBODY is nonzero, this level is the body of a function,
439 so create a block as if KEEP were set and also clear out all
442 If REVERSE is nonzero, reverse the order of decls before putting
443 them into the BLOCK. */
446 poplevel (int keep, int reverse, int functionbody)
449 /* The chain of decls was accumulated in reverse order.
450 Put it into forward order, just for cleanliness. */
452 int tmp = functionbody;
453 int real_functionbody;
457 int leaving_for_scope;
460 timevar_push (TV_NAME_LOOKUP);
465 gcc_assert (current_binding_level->kind != sk_class);
467 real_functionbody = (current_binding_level->kind == sk_cleanup
468 ? ((functionbody = 0), tmp) : functionbody);
469 subblocks = functionbody >= 0 ? current_binding_level->blocks : 0;
471 gcc_assert (!VEC_length(cp_class_binding,
472 current_binding_level->class_shadowed));
474 /* We used to use KEEP == 2 to indicate that the new block should go
475 at the beginning of the list of blocks at this binding level,
476 rather than the end. This hack is no longer used. */
477 gcc_assert (keep == 0 || keep == 1);
479 if (current_binding_level->keep)
482 /* Any uses of undefined labels, and any defined labels, now operate
483 under constraints of next binding contour. */
484 if (cfun && !functionbody)
486 struct cp_binding_level *level_chain;
487 level_chain = current_binding_level->level_chain;
490 struct named_label_use_list *uses;
491 struct named_label_list *labels;
492 for (labels = named_labels; labels; labels = labels->next)
493 if (labels->binding_level == current_binding_level)
496 if (current_binding_level->kind == sk_try)
497 labels->in_try_scope = 1;
498 if (current_binding_level->kind == sk_catch)
499 labels->in_catch_scope = 1;
500 for (decl = labels->names_in_scope; decl;
501 decl = TREE_CHAIN (decl))
502 if (decl_jump_unsafe (decl))
503 labels->bad_decls = tree_cons (NULL_TREE, decl,
505 labels->binding_level = level_chain;
506 labels->names_in_scope = level_chain->names;
509 for (uses = named_label_uses; uses; uses = uses->next)
510 if (uses->binding_level == current_binding_level)
512 uses->binding_level = level_chain;
513 uses->names_in_scope = level_chain->names;
518 /* Get the decls in the order they were written.
519 Usually current_binding_level->names is in reverse order.
520 But parameter decls were previously put in forward order. */
523 current_binding_level->names
524 = decls = nreverse (current_binding_level->names);
526 decls = current_binding_level->names;
528 /* If there were any declarations or structure tags in that level,
529 or if this level is a function body,
530 create a BLOCK to record them for the life of this function. */
532 if (keep == 1 || functionbody)
533 block = make_node (BLOCK);
534 if (block != NULL_TREE)
536 BLOCK_VARS (block) = decls;
537 BLOCK_SUBBLOCKS (block) = subblocks;
540 /* In each subblock, record that this is its superior. */
542 for (link = subblocks; link; link = TREE_CHAIN (link))
543 BLOCK_SUPERCONTEXT (link) = block;
545 /* We still support the old for-scope rules, whereby the variables
546 in a for-init statement were in scope after the for-statement
547 ended. We only use the new rules if flag_new_for_scope is
550 = current_binding_level->kind == sk_for && flag_new_for_scope == 1;
552 /* Before we remove the declarations first check for unused variables. */
553 if (warn_unused_variable
554 && !processing_template_decl)
555 for (decl = getdecls (); decl; decl = TREE_CHAIN (decl))
556 if (TREE_CODE (decl) == VAR_DECL
557 && ! TREE_USED (decl)
558 && ! DECL_IN_SYSTEM_HEADER (decl)
559 && DECL_NAME (decl) && ! DECL_ARTIFICIAL (decl))
560 warning (0, "unused variable %q+D", decl);
562 /* Remove declarations for all the DECLs in this level. */
563 for (link = decls; link; link = TREE_CHAIN (link))
565 if (leaving_for_scope && TREE_CODE (link) == VAR_DECL
568 tree name = DECL_NAME (link);
572 ob = outer_binding (name,
573 IDENTIFIER_BINDING (name),
576 ns_binding = IDENTIFIER_NAMESPACE_VALUE (name);
578 ns_binding = NULL_TREE;
580 if (ob && ob->scope == current_binding_level->level_chain)
581 /* We have something like:
586 and we are leaving the `for' scope. There's no reason to
587 keep the binding of the inner `i' in this case. */
588 pop_binding (name, link);
589 else if ((ob && (TREE_CODE (ob->value) == TYPE_DECL))
590 || (ns_binding && TREE_CODE (ns_binding) == TYPE_DECL))
591 /* Here, we have something like:
599 We must pop the for-scope binding so we know what's a
600 type and what isn't. */
601 pop_binding (name, link);
604 /* Mark this VAR_DECL as dead so that we can tell we left it
605 there only for backward compatibility. */
606 DECL_DEAD_FOR_LOCAL (link) = 1;
608 /* Keep track of what should have happened when we
609 popped the binding. */
612 SET_DECL_SHADOWED_FOR_VAR (link, ob->value);
613 DECL_HAS_SHADOWED_FOR_VAR_P (link) = 1;
616 /* Add it to the list of dead variables in the next
617 outermost binding to that we can remove these when we
618 leave that binding. */
619 current_binding_level->level_chain->dead_vars_from_for
620 = tree_cons (NULL_TREE, link,
621 current_binding_level->level_chain->
624 /* Although we don't pop the cxx_binding, we do clear
625 its SCOPE since the scope is going away now. */
626 IDENTIFIER_BINDING (name)->scope
627 = current_binding_level->level_chain;
634 /* Remove the binding. */
637 if (TREE_CODE (decl) == TREE_LIST)
638 decl = TREE_VALUE (decl);
641 if (TREE_CODE (name) == OVERLOAD)
642 name = OVL_FUNCTION (name);
644 gcc_assert (DECL_P (name));
645 pop_binding (DECL_NAME (name), decl);
649 /* Remove declarations for any `for' variables from inner scopes
650 that we kept around. */
651 for (link = current_binding_level->dead_vars_from_for;
652 link; link = TREE_CHAIN (link))
653 pop_binding (DECL_NAME (TREE_VALUE (link)), TREE_VALUE (link));
655 /* Restore the IDENTIFIER_TYPE_VALUEs. */
656 for (link = current_binding_level->type_shadowed;
657 link; link = TREE_CHAIN (link))
658 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (link), TREE_VALUE (link));
660 /* Restore the IDENTIFIER_LABEL_VALUEs for local labels. */
661 for (link = current_binding_level->shadowed_labels;
663 link = TREE_CHAIN (link))
664 pop_label (TREE_VALUE (link), TREE_PURPOSE (link));
666 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
667 list if a `using' declaration put them there. The debugging
668 back-ends won't understand OVERLOAD, so we remove them here.
669 Because the BLOCK_VARS are (temporarily) shared with
670 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
671 popped all the bindings. */
676 for (d = &BLOCK_VARS (block); *d; )
678 if (TREE_CODE (*d) == TREE_LIST)
679 *d = TREE_CHAIN (*d);
681 d = &TREE_CHAIN (*d);
685 /* If the level being exited is the top level of a function,
686 check over all the labels. */
689 /* Since this is the top level block of a function, the vars are
690 the function's parameters. Don't leave them in the BLOCK
691 because they are found in the FUNCTION_DECL instead. */
692 BLOCK_VARS (block) = 0;
696 kind = current_binding_level->kind;
697 if (kind == sk_cleanup)
701 /* If this is a temporary binding created for a cleanup, then we'll
702 have pushed a statement list level. Pop that, create a new
703 BIND_EXPR for the block, and insert it into the stream. */
704 stmt = pop_stmt_list (current_binding_level->statement_list);
705 stmt = c_build_bind_expr (block, stmt);
711 DECL_INITIAL (current_function_decl) = block;
713 current_binding_level->blocks
714 = chainon (current_binding_level->blocks, block);
716 /* If we did not make a block for the level just exited,
717 any blocks made for inner levels
718 (since they cannot be recorded as subblocks in that level)
719 must be carried forward so they will later become subblocks
720 of something else. */
722 current_binding_level->blocks
723 = chainon (current_binding_level->blocks, subblocks);
725 /* Each and every BLOCK node created here in `poplevel' is important
726 (e.g. for proper debugging information) so if we created one
727 earlier, mark it as "used". */
729 TREE_USED (block) = 1;
731 /* All temporary bindings created for cleanups are popped silently. */
732 if (kind == sk_cleanup)
735 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, block);
738 /* Insert BLOCK at the end of the list of subblocks of the
739 current binding level. This is used when a BIND_EXPR is expanded,
740 to handle the BLOCK node inside the BIND_EXPR. */
743 insert_block (tree block)
745 TREE_USED (block) = 1;
746 current_binding_level->blocks
747 = chainon (current_binding_level->blocks, block);
750 /* Walk all the namespaces contained NAMESPACE, including NAMESPACE
751 itself, calling F for each. The DATA is passed to F as well. */
754 walk_namespaces_r (tree namespace, walk_namespaces_fn f, void* data)
757 tree current = NAMESPACE_LEVEL (namespace)->namespaces;
759 result |= (*f) (namespace, data);
761 for (; current; current = TREE_CHAIN (current))
762 result |= walk_namespaces_r (current, f, data);
767 /* Walk all the namespaces, calling F for each. The DATA is passed to
771 walk_namespaces (walk_namespaces_fn f, void* data)
773 return walk_namespaces_r (global_namespace, f, data);
776 /* Call wrapup_globals_declarations for the globals in NAMESPACE. If
777 DATA is non-NULL, this is the last time we will call
778 wrapup_global_declarations for this NAMESPACE. */
781 wrapup_globals_for_namespace (tree namespace, void* data)
783 struct cp_binding_level *level = NAMESPACE_LEVEL (namespace);
784 VEC(tree,gc) *statics = level->static_decls;
785 tree *vec = VEC_address (tree, statics);
786 int len = VEC_length (tree, statics);
787 int last_time = (data != 0);
791 check_global_declarations (vec, len);
792 emit_debug_global_declarations (vec, len);
796 /* Write out any globals that need to be output. */
797 return wrapup_global_declarations (vec, len);
801 /* In C++, you don't have to write `struct S' to refer to `S'; you
802 can just use `S'. We accomplish this by creating a TYPE_DECL as
803 if the user had written `typedef struct S S'. Create and return
804 the TYPE_DECL for TYPE. */
807 create_implicit_typedef (tree name, tree type)
811 decl = build_decl (TYPE_DECL, name, type);
812 DECL_ARTIFICIAL (decl) = 1;
813 /* There are other implicit type declarations, like the one *within*
814 a class that allows you to write `S::S'. We must distinguish
816 SET_DECL_IMPLICIT_TYPEDEF_P (decl);
817 TYPE_NAME (type) = decl;
822 /* Remember a local name for name-mangling purposes. */
825 push_local_name (tree decl)
830 timevar_push (TV_NAME_LOOKUP);
832 name = DECL_NAME (decl);
834 nelts = VEC_length (tree, local_names);
835 for (i = 0; i < nelts; i++)
837 t = VEC_index (tree, local_names, i);
838 if (DECL_NAME (t) == name)
840 if (!DECL_LANG_SPECIFIC (decl))
841 retrofit_lang_decl (decl);
842 DECL_LANG_SPECIFIC (decl)->decl_flags.u2sel = 1;
843 if (DECL_LANG_SPECIFIC (t))
844 DECL_DISCRIMINATOR (decl) = DECL_DISCRIMINATOR (t) + 1;
846 DECL_DISCRIMINATOR (decl) = 1;
848 VEC_replace (tree, local_names, i, decl);
849 timevar_pop (TV_NAME_LOOKUP);
854 VEC_safe_push (tree, gc, local_names, decl);
855 timevar_pop (TV_NAME_LOOKUP);
858 /* Subroutine of duplicate_decls: return truthvalue of whether
859 or not types of these decls match.
861 For C++, we must compare the parameter list so that `int' can match
862 `int&' in a parameter position, but `int&' is not confused with
866 decls_match (tree newdecl, tree olddecl)
870 if (newdecl == olddecl)
873 if (TREE_CODE (newdecl) != TREE_CODE (olddecl))
874 /* If the two DECLs are not even the same kind of thing, we're not
875 interested in their types. */
878 if (TREE_CODE (newdecl) == FUNCTION_DECL)
880 tree f1 = TREE_TYPE (newdecl);
881 tree f2 = TREE_TYPE (olddecl);
882 tree p1 = TYPE_ARG_TYPES (f1);
883 tree p2 = TYPE_ARG_TYPES (f2);
885 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
886 && ! (DECL_EXTERN_C_P (newdecl)
887 && DECL_EXTERN_C_P (olddecl)))
890 if (TREE_CODE (f1) != TREE_CODE (f2))
893 if (same_type_p (TREE_TYPE (f1), TREE_TYPE (f2)))
895 if (p2 == NULL_TREE && DECL_EXTERN_C_P (olddecl)
896 && (DECL_BUILT_IN (olddecl)
897 #ifndef NO_IMPLICIT_EXTERN_C
898 || (DECL_IN_SYSTEM_HEADER (newdecl) && !DECL_CLASS_SCOPE_P (newdecl))
899 || (DECL_IN_SYSTEM_HEADER (olddecl) && !DECL_CLASS_SCOPE_P (olddecl))
903 types_match = self_promoting_args_p (p1);
904 if (p1 == void_list_node)
905 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
907 #ifndef NO_IMPLICIT_EXTERN_C
908 else if (p1 == NULL_TREE
909 && (DECL_EXTERN_C_P (olddecl)
910 && DECL_IN_SYSTEM_HEADER (olddecl)
911 && !DECL_CLASS_SCOPE_P (olddecl))
912 && (DECL_EXTERN_C_P (newdecl)
913 && DECL_IN_SYSTEM_HEADER (newdecl)
914 && !DECL_CLASS_SCOPE_P (newdecl)))
916 types_match = self_promoting_args_p (p2);
917 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
921 types_match = compparms (p1, p2);
926 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
928 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl))
929 != TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)))
932 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
933 DECL_TEMPLATE_PARMS (olddecl)))
936 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
937 types_match = same_type_p (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl)),
938 TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl)));
940 types_match = decls_match (DECL_TEMPLATE_RESULT (olddecl),
941 DECL_TEMPLATE_RESULT (newdecl));
945 /* Need to check scope for variable declaration (VAR_DECL).
946 For typedef (TYPE_DECL), scope is ignored. */
947 if (TREE_CODE (newdecl) == VAR_DECL
948 && CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
951 if (TREE_TYPE (newdecl) == error_mark_node)
952 types_match = TREE_TYPE (olddecl) == error_mark_node;
953 else if (TREE_TYPE (olddecl) == NULL_TREE)
954 types_match = TREE_TYPE (newdecl) == NULL_TREE;
955 else if (TREE_TYPE (newdecl) == NULL_TREE)
958 types_match = comptypes (TREE_TYPE (newdecl),
960 COMPARE_REDECLARATION);
966 /* If NEWDECL is `static' and an `extern' was seen previously,
967 warn about it. OLDDECL is the previous declaration.
969 Note that this does not apply to the C++ case of declaring
970 a variable `extern const' and then later `const'.
972 Don't complain about built-in functions, since they are beyond
973 the user's control. */
976 warn_extern_redeclared_static (tree newdecl, tree olddecl)
980 if (TREE_CODE (newdecl) == TYPE_DECL
981 || TREE_CODE (newdecl) == TEMPLATE_DECL
982 || TREE_CODE (newdecl) == CONST_DECL
983 || TREE_CODE (newdecl) == NAMESPACE_DECL)
986 /* Don't get confused by static member functions; that's a different
988 if (TREE_CODE (newdecl) == FUNCTION_DECL
989 && DECL_STATIC_FUNCTION_P (newdecl))
992 /* If the old declaration was `static', or the new one isn't, then
993 then everything is OK. */
994 if (DECL_THIS_STATIC (olddecl) || !DECL_THIS_STATIC (newdecl))
997 /* It's OK to declare a builtin function as `static'. */
998 if (TREE_CODE (olddecl) == FUNCTION_DECL
999 && DECL_ARTIFICIAL (olddecl))
1002 name = DECL_ASSEMBLER_NAME (newdecl);
1003 pedwarn ("%qD was declared %<extern%> and later %<static%>", newdecl);
1004 pedwarn ("previous declaration of %q+D", olddecl);
1007 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1008 If the redeclaration is invalid, a diagnostic is issued, and the
1009 error_mark_node is returned. Otherwise, OLDDECL is returned.
1011 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1014 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1017 duplicate_decls (tree newdecl, tree olddecl, bool newdecl_is_friend)
1019 unsigned olddecl_uid = DECL_UID (olddecl);
1020 int olddecl_friend = 0, types_match = 0, hidden_friend = 0;
1021 int new_defines_function = 0;
1023 if (newdecl == olddecl)
1026 types_match = decls_match (newdecl, olddecl);
1028 /* If either the type of the new decl or the type of the old decl is an
1029 error_mark_node, then that implies that we have already issued an
1030 error (earlier) for some bogus type specification, and in that case,
1031 it is rather pointless to harass the user with yet more error message
1032 about the same declaration, so just pretend the types match here. */
1033 if (TREE_TYPE (newdecl) == error_mark_node
1034 || TREE_TYPE (olddecl) == error_mark_node)
1037 if (DECL_P (olddecl)
1038 && TREE_CODE (newdecl) == FUNCTION_DECL
1039 && TREE_CODE (olddecl) == FUNCTION_DECL
1040 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1042 if (DECL_DECLARED_INLINE_P (newdecl)
1043 && DECL_UNINLINABLE (newdecl)
1044 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1045 /* Already warned elsewhere. */;
1046 else if (DECL_DECLARED_INLINE_P (olddecl)
1047 && DECL_UNINLINABLE (olddecl)
1048 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1049 /* Already warned. */;
1050 else if (DECL_DECLARED_INLINE_P (newdecl)
1051 && DECL_UNINLINABLE (olddecl)
1052 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1054 warning (OPT_Wattributes, "function %q+D redeclared as inline",
1056 warning (OPT_Wattributes, "previous declaration of %q+D "
1057 "with attribute noinline", olddecl);
1059 else if (DECL_DECLARED_INLINE_P (olddecl)
1060 && DECL_UNINLINABLE (newdecl)
1061 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1063 warning (OPT_Wattributes, "function %q+D redeclared with "
1064 "attribute noinline", newdecl);
1065 warning (OPT_Wattributes, "previous declaration of %q+D was inline",
1070 /* Check for redeclaration and other discrepancies. */
1071 if (TREE_CODE (olddecl) == FUNCTION_DECL
1072 && DECL_ARTIFICIAL (olddecl))
1074 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl));
1075 if (TREE_CODE (newdecl) != FUNCTION_DECL)
1077 /* Avoid warnings redeclaring built-ins which have not been
1078 explicitly declared. */
1079 if (DECL_ANTICIPATED (olddecl))
1082 /* If you declare a built-in or predefined function name as static,
1083 the old definition is overridden, but optionally warn this was a
1084 bad choice of name. */
1085 if (! TREE_PUBLIC (newdecl))
1088 warning (0, "shadowing %s function %q#D",
1089 DECL_BUILT_IN (olddecl) ? "built-in" : "library",
1091 /* Discard the old built-in function. */
1094 /* If the built-in is not ansi, then programs can override
1095 it even globally without an error. */
1096 else if (! DECL_BUILT_IN (olddecl))
1097 warning (0, "library function %q#D redeclared as non-function %q#D",
1101 error ("declaration of %q#D", newdecl);
1102 error ("conflicts with built-in declaration %q#D",
1107 else if (!types_match)
1109 /* Avoid warnings redeclaring built-ins which have not been
1110 explicitly declared. */
1111 if (DECL_ANTICIPATED (olddecl))
1113 /* Deal with fileptr_type_node. FILE type is not known
1114 at the time we create the builtins. */
1117 for (t1 = TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1118 t2 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1120 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1123 else if (TREE_VALUE (t2) == fileptr_type_node)
1125 tree t = TREE_VALUE (t1);
1127 if (TREE_CODE (t) == POINTER_TYPE
1128 && TYPE_NAME (TREE_TYPE (t))
1129 && DECL_NAME (TYPE_NAME (TREE_TYPE (t)))
1130 == get_identifier ("FILE")
1131 && compparms (TREE_CHAIN (t1), TREE_CHAIN (t2)))
1133 tree oldargs = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1135 TYPE_ARG_TYPES (TREE_TYPE (olddecl))
1136 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1137 types_match = decls_match (newdecl, olddecl);
1139 return duplicate_decls (newdecl, olddecl,
1141 TYPE_ARG_TYPES (TREE_TYPE (olddecl)) = oldargs;
1144 else if (! same_type_p (TREE_VALUE (t1), TREE_VALUE (t2)))
1147 else if ((DECL_EXTERN_C_P (newdecl)
1148 && DECL_EXTERN_C_P (olddecl))
1149 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1150 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1152 /* A near match; override the builtin. */
1154 if (TREE_PUBLIC (newdecl))
1156 warning (0, "new declaration %q#D", newdecl);
1157 warning (0, "ambiguates built-in declaration %q#D",
1160 else if (warn_shadow)
1161 warning (0, "shadowing %s function %q#D",
1162 DECL_BUILT_IN (olddecl) ? "built-in" : "library",
1166 /* Discard the old built-in function. */
1169 /* Replace the old RTL to avoid problems with inlining. */
1170 COPY_DECL_RTL (newdecl, olddecl);
1172 /* Even if the types match, prefer the new declarations type for
1173 built-ins which have not been explicitly declared, for
1174 exception lists, etc... */
1175 else if (DECL_ANTICIPATED (olddecl))
1177 tree type = TREE_TYPE (newdecl);
1178 tree attribs = (*targetm.merge_type_attributes)
1179 (TREE_TYPE (olddecl), type);
1181 type = cp_build_type_attribute_variant (type, attribs);
1182 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = type;
1185 /* Whether or not the builtin can throw exceptions has no
1186 bearing on this declarator. */
1187 TREE_NOTHROW (olddecl) = 0;
1189 if (DECL_THIS_STATIC (newdecl) && !DECL_THIS_STATIC (olddecl))
1191 /* If a builtin function is redeclared as `static', merge
1192 the declarations, but make the original one static. */
1193 DECL_THIS_STATIC (olddecl) = 1;
1194 TREE_PUBLIC (olddecl) = 0;
1196 /* Make the old declaration consistent with the new one so
1197 that all remnants of the builtin-ness of this function
1198 will be banished. */
1199 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1200 COPY_DECL_RTL (newdecl, olddecl);
1203 else if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1205 if ((TREE_CODE (olddecl) == TYPE_DECL && DECL_ARTIFICIAL (olddecl)
1206 && TREE_CODE (newdecl) != TYPE_DECL
1207 && ! (TREE_CODE (newdecl) == TEMPLATE_DECL
1208 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL))
1209 || (TREE_CODE (newdecl) == TYPE_DECL && DECL_ARTIFICIAL (newdecl)
1210 && TREE_CODE (olddecl) != TYPE_DECL
1211 && ! (TREE_CODE (olddecl) == TEMPLATE_DECL
1212 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
1215 /* We do nothing special here, because C++ does such nasty
1216 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1217 get shadowed, and know that if we need to find a TYPE_DECL
1218 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1219 slot of the identifier. */
1223 if ((TREE_CODE (newdecl) == FUNCTION_DECL
1224 && DECL_FUNCTION_TEMPLATE_P (olddecl))
1225 || (TREE_CODE (olddecl) == FUNCTION_DECL
1226 && DECL_FUNCTION_TEMPLATE_P (newdecl)))
1229 error ("%q#D redeclared as different kind of symbol", newdecl);
1230 if (TREE_CODE (olddecl) == TREE_LIST)
1231 olddecl = TREE_VALUE (olddecl);
1232 error ("previous declaration of %q+#D", olddecl);
1234 return error_mark_node;
1236 else if (!types_match)
1238 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
1239 /* These are certainly not duplicate declarations; they're
1240 from different scopes. */
1243 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1245 /* The name of a class template may not be declared to refer to
1246 any other template, class, function, object, namespace, value,
1247 or type in the same scope. */
1248 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == TYPE_DECL
1249 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1251 error ("declaration of template %q#D", newdecl);
1252 error ("conflicts with previous declaration %q+#D", olddecl);
1254 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == FUNCTION_DECL
1255 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == FUNCTION_DECL
1256 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl))),
1257 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl))))
1258 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1259 DECL_TEMPLATE_PARMS (olddecl))
1260 /* Template functions can be disambiguated by
1262 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl)),
1263 TREE_TYPE (TREE_TYPE (olddecl))))
1265 error ("new declaration %q#D", newdecl);
1266 error ("ambiguates old declaration %q+#D", olddecl);
1270 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1272 if (DECL_EXTERN_C_P (newdecl) && DECL_EXTERN_C_P (olddecl))
1274 error ("declaration of C function %q#D conflicts with",
1276 error ("previous declaration %q+#D here", olddecl);
1278 else if (compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1279 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1281 error ("new declaration %q#D", newdecl);
1282 error ("ambiguates old declaration %q+#D", olddecl);
1289 error ("conflicting declaration %q#D", newdecl);
1290 error ("%q+D has a previous declaration as %q#D", olddecl, olddecl);
1291 return error_mark_node;
1294 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1295 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1296 && (!DECL_TEMPLATE_INFO (newdecl)
1297 || (DECL_TI_TEMPLATE (newdecl)
1298 != DECL_TI_TEMPLATE (olddecl))))
1299 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1300 && (!DECL_TEMPLATE_INFO (olddecl)
1301 || (DECL_TI_TEMPLATE (olddecl)
1302 != DECL_TI_TEMPLATE (newdecl))))))
1303 /* It's OK to have a template specialization and a non-template
1304 with the same type, or to have specializations of two
1305 different templates with the same type. Note that if one is a
1306 specialization, and the other is an instantiation of the same
1307 template, that we do not exit at this point. That situation
1308 can occur if we instantiate a template class, and then
1309 specialize one of its methods. This situation is valid, but
1310 the declarations must be merged in the usual way. */
1312 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1313 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1314 && !DECL_USE_TEMPLATE (newdecl))
1315 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1316 && !DECL_USE_TEMPLATE (olddecl))))
1317 /* One of the declarations is a template instantiation, and the
1318 other is not a template at all. That's OK. */
1320 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1322 /* In [namespace.alias] we have:
1324 In a declarative region, a namespace-alias-definition can be
1325 used to redefine a namespace-alias declared in that declarative
1326 region to refer only to the namespace to which it already
1329 Therefore, if we encounter a second alias directive for the same
1330 alias, we can just ignore the second directive. */
1331 if (DECL_NAMESPACE_ALIAS (newdecl)
1332 && (DECL_NAMESPACE_ALIAS (newdecl)
1333 == DECL_NAMESPACE_ALIAS (olddecl)))
1335 /* [namespace.alias]
1337 A namespace-name or namespace-alias shall not be declared as
1338 the name of any other entity in the same declarative region.
1339 A namespace-name defined at global scope shall not be
1340 declared as the name of any other entity in any global scope
1342 error ("declaration of namespace %qD conflicts with", newdecl);
1343 error ("previous declaration of namespace %q+D here", olddecl);
1344 return error_mark_node;
1348 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1351 error (errmsg, newdecl);
1352 if (DECL_NAME (olddecl) != NULL_TREE)
1353 error ((DECL_INITIAL (olddecl) && namespace_bindings_p ())
1354 ? "%q+#D previously defined here"
1355 : "%q+#D previously declared here", olddecl);
1356 return error_mark_node;
1358 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1359 && DECL_INITIAL (olddecl) != NULL_TREE
1360 && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) == NULL_TREE
1361 && TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != NULL_TREE)
1363 /* Prototype decl follows defn w/o prototype. */
1364 warning (0, "prototype for %q+#D", newdecl);
1365 warning (0, "%Jfollows non-prototype definition here", olddecl);
1367 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1368 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1370 /* extern "C" int foo ();
1371 int foo () { bar (); }
1373 if (current_lang_depth () == 0)
1374 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1377 error ("previous declaration of %q+#D with %qL linkage",
1378 olddecl, DECL_LANGUAGE (olddecl));
1379 error ("conflicts with new declaration with %qL linkage",
1380 DECL_LANGUAGE (newdecl));
1384 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1386 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1388 tree t1 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1389 tree t2 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1392 if (TREE_CODE (TREE_TYPE (newdecl)) == METHOD_TYPE)
1393 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2);
1395 for (; t1 && t1 != void_list_node;
1396 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1397 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1399 if (1 == simple_cst_equal (TREE_PURPOSE (t1),
1402 pedwarn ("default argument given for parameter %d of %q#D",
1404 pedwarn ("after previous specification in %q+#D", olddecl);
1408 error ("default argument given for parameter %d of %q#D",
1410 error ("after previous specification in %q+#D",
1415 if (DECL_DECLARED_INLINE_P (newdecl)
1416 && ! DECL_DECLARED_INLINE_P (olddecl)
1417 && TREE_ADDRESSABLE (olddecl) && warn_inline)
1419 warning (0, "%q#D was used before it was declared inline", newdecl);
1420 warning (0, "%Jprevious non-inline declaration here", olddecl);
1425 /* Do not merge an implicit typedef with an explicit one. In:
1429 typedef class A A __attribute__ ((foo));
1431 the attribute should apply only to the typedef. */
1432 if (TREE_CODE (olddecl) == TYPE_DECL
1433 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1434 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1437 /* If new decl is `static' and an `extern' was seen previously,
1439 warn_extern_redeclared_static (newdecl, olddecl);
1441 /* We have committed to returning 1 at this point. */
1442 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1444 /* Now that functions must hold information normally held
1445 by field decls, there is extra work to do so that
1446 declaration information does not get destroyed during
1448 if (DECL_VINDEX (olddecl))
1449 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1450 if (DECL_CONTEXT (olddecl))
1451 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1452 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1453 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1454 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1455 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1456 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1457 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1458 SET_OVERLOADED_OPERATOR_CODE
1459 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1460 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1462 /* Optionally warn about more than one declaration for the same
1463 name, but don't warn about a function declaration followed by a
1465 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1466 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1467 /* Don't warn about extern decl followed by definition. */
1468 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1469 /* Don't warn about friends, let add_friend take care of it. */
1470 && ! (newdecl_is_friend || DECL_FRIEND_P (olddecl)))
1472 warning (0, "redundant redeclaration of %qD in same scope", newdecl);
1473 warning (0, "previous declaration of %q+D", olddecl);
1477 /* Deal with C++: must preserve virtual function table size. */
1478 if (TREE_CODE (olddecl) == TYPE_DECL)
1480 tree newtype = TREE_TYPE (newdecl);
1481 tree oldtype = TREE_TYPE (olddecl);
1483 if (newtype != error_mark_node && oldtype != error_mark_node
1484 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1485 CLASSTYPE_FRIEND_CLASSES (newtype)
1486 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1488 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1491 /* Copy all the DECL_... slots specified in the new decl
1492 except for any that we copy here from the old type. */
1493 DECL_ATTRIBUTES (newdecl)
1494 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1496 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1498 TREE_TYPE (olddecl) = TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl));
1499 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1500 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1501 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1503 /* If the new declaration is a definition, update the file and
1504 line information on the declaration. */
1505 if (DECL_INITIAL (DECL_TEMPLATE_RESULT (olddecl)) == NULL_TREE
1506 && DECL_INITIAL (DECL_TEMPLATE_RESULT (newdecl)) != NULL_TREE)
1508 DECL_SOURCE_LOCATION (olddecl)
1509 = DECL_SOURCE_LOCATION (DECL_TEMPLATE_RESULT (olddecl))
1510 = DECL_SOURCE_LOCATION (newdecl);
1511 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1512 DECL_ARGUMENTS (DECL_TEMPLATE_RESULT (olddecl))
1513 = DECL_ARGUMENTS (DECL_TEMPLATE_RESULT (newdecl));
1516 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1518 DECL_INLINE (DECL_TEMPLATE_RESULT (olddecl))
1519 |= DECL_INLINE (DECL_TEMPLATE_RESULT (newdecl));
1520 DECL_DECLARED_INLINE_P (DECL_TEMPLATE_RESULT (olddecl))
1521 |= DECL_DECLARED_INLINE_P (DECL_TEMPLATE_RESULT (newdecl));
1529 /* Automatically handles default parameters. */
1530 tree oldtype = TREE_TYPE (olddecl);
1533 /* Merge the data types specified in the two decls. */
1534 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1536 /* If merge_types produces a non-typedef type, just use the old type. */
1537 if (TREE_CODE (newdecl) == TYPE_DECL
1538 && newtype == DECL_ORIGINAL_TYPE (newdecl))
1541 if (TREE_CODE (newdecl) == VAR_DECL)
1543 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
1544 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
1545 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
1546 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
1549 /* Do this after calling `merge_types' so that default
1550 parameters don't confuse us. */
1551 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1552 && (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (newdecl))
1553 != TYPE_RAISES_EXCEPTIONS (TREE_TYPE (olddecl))))
1555 TREE_TYPE (newdecl) = build_exception_variant (newtype,
1556 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (newdecl)));
1557 TREE_TYPE (olddecl) = build_exception_variant (newtype,
1558 TYPE_RAISES_EXCEPTIONS (oldtype));
1560 if ((pedantic || ! DECL_IN_SYSTEM_HEADER (olddecl))
1561 && ! DECL_IS_BUILTIN (olddecl)
1563 && !comp_except_specs (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (newdecl)),
1564 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (olddecl)), 1))
1566 error ("declaration of %qF throws different exceptions",
1568 error ("than previous declaration %q+F", olddecl);
1571 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
1573 /* Lay the type out, unless already done. */
1574 if (! same_type_p (newtype, oldtype)
1575 && TREE_TYPE (newdecl) != error_mark_node
1576 && !(processing_template_decl && uses_template_parms (newdecl)))
1577 layout_type (TREE_TYPE (newdecl));
1579 if ((TREE_CODE (newdecl) == VAR_DECL
1580 || TREE_CODE (newdecl) == PARM_DECL
1581 || TREE_CODE (newdecl) == RESULT_DECL
1582 || TREE_CODE (newdecl) == FIELD_DECL
1583 || TREE_CODE (newdecl) == TYPE_DECL)
1584 && !(processing_template_decl && uses_template_parms (newdecl)))
1585 layout_decl (newdecl, 0);
1587 /* Merge the type qualifiers. */
1588 if (TREE_READONLY (newdecl))
1589 TREE_READONLY (olddecl) = 1;
1590 if (TREE_THIS_VOLATILE (newdecl))
1591 TREE_THIS_VOLATILE (olddecl) = 1;
1592 if (TREE_NOTHROW (newdecl))
1593 TREE_NOTHROW (olddecl) = 1;
1595 /* Merge deprecatedness. */
1596 if (TREE_DEPRECATED (newdecl))
1597 TREE_DEPRECATED (olddecl) = 1;
1599 /* Merge the initialization information. */
1600 if (DECL_INITIAL (newdecl) == NULL_TREE
1601 && DECL_INITIAL (olddecl) != NULL_TREE)
1603 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1604 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1605 if (CAN_HAVE_FULL_LANG_DECL_P (newdecl)
1606 && DECL_LANG_SPECIFIC (newdecl)
1607 && DECL_LANG_SPECIFIC (olddecl))
1609 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1610 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1614 /* Merge the section attribute.
1615 We want to issue an error if the sections conflict but that must be
1616 done later in decl_attributes since we are called before attributes
1618 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1619 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1621 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1623 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1624 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1625 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1626 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1627 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1628 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
1629 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1630 DECL_IS_PURE (newdecl) |= DECL_IS_PURE (olddecl);
1631 /* Keep the old RTL. */
1632 COPY_DECL_RTL (olddecl, newdecl);
1634 else if (TREE_CODE (newdecl) == VAR_DECL
1635 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
1637 /* Keep the old RTL. We cannot keep the old RTL if the old
1638 declaration was for an incomplete object and the new
1639 declaration is not since many attributes of the RTL will
1641 COPY_DECL_RTL (olddecl, newdecl);
1644 /* If cannot merge, then use the new type and qualifiers,
1645 and don't preserve the old rtl. */
1648 /* Clean out any memory we had of the old declaration. */
1649 tree oldstatic = value_member (olddecl, static_aggregates);
1651 TREE_VALUE (oldstatic) = error_mark_node;
1653 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1654 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1655 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1656 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1659 /* Merge the storage class information. */
1660 merge_weak (newdecl, olddecl);
1662 DECL_ONE_ONLY (newdecl) |= DECL_ONE_ONLY (olddecl);
1663 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
1664 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1665 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
1666 if (! DECL_EXTERNAL (olddecl))
1667 DECL_EXTERNAL (newdecl) = 0;
1669 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
1671 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
1672 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
1673 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
1674 DECL_TEMPLATE_INSTANTIATED (newdecl)
1675 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
1677 /* If the OLDDECL is an instantiation and/or specialization,
1678 then the NEWDECL must be too. But, it may not yet be marked
1679 as such if the caller has created NEWDECL, but has not yet
1680 figured out that it is a redeclaration. */
1681 if (!DECL_USE_TEMPLATE (newdecl))
1682 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
1684 /* Don't really know how much of the language-specific
1685 values we should copy from old to new. */
1686 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
1687 DECL_LANG_SPECIFIC (newdecl)->decl_flags.u2 =
1688 DECL_LANG_SPECIFIC (olddecl)->decl_flags.u2;
1689 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
1690 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
1691 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
1692 DECL_INITIALIZED_IN_CLASS_P (newdecl)
1693 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
1694 olddecl_friend = DECL_FRIEND_P (olddecl);
1695 hidden_friend = (DECL_ANTICIPATED (olddecl)
1696 && DECL_HIDDEN_FRIEND_P (olddecl)
1697 && newdecl_is_friend);
1699 /* Only functions have DECL_BEFRIENDING_CLASSES. */
1700 if (TREE_CODE (newdecl) == FUNCTION_DECL
1701 || DECL_FUNCTION_TEMPLATE_P (newdecl))
1703 DECL_BEFRIENDING_CLASSES (newdecl)
1704 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
1705 DECL_BEFRIENDING_CLASSES (olddecl));
1706 /* DECL_THUNKS is only valid for virtual functions,
1707 otherwise it is a DECL_FRIEND_CONTEXT. */
1708 if (DECL_VIRTUAL_P (newdecl))
1709 DECL_THUNKS (newdecl) = DECL_THUNKS (olddecl);
1713 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1715 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
1716 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
1718 /* If newdecl is not a specialization, then it is not a
1719 template-related function at all. And that means that we
1720 should have exited above, returning 0. */
1721 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
1723 if (TREE_USED (olddecl))
1724 /* From [temp.expl.spec]:
1726 If a template, a member template or the member of a class
1727 template is explicitly specialized then that
1728 specialization shall be declared before the first use of
1729 that specialization that would cause an implicit
1730 instantiation to take place, in every translation unit in
1731 which such a use occurs. */
1732 error ("explicit specialization of %qD after first use",
1735 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
1737 /* [temp.expl.spec/14] We don't inline explicit specialization
1738 just because the primary template says so. */
1742 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
1743 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
1745 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
1747 /* If either decl says `inline', this fn is inline, unless
1748 its definition was passed already. */
1749 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == NULL_TREE)
1750 DECL_INLINE (olddecl) = 1;
1751 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1753 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1754 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1757 /* Preserve abstractness on cloned [cd]tors. */
1758 DECL_ABSTRACT (newdecl) = DECL_ABSTRACT (olddecl);
1762 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1763 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
1764 COPY_DECL_RTL (newdecl, olddecl);
1766 if (! types_match || new_defines_function)
1768 /* These need to be copied so that the names are available.
1769 Note that if the types do match, we'll preserve inline
1770 info and other bits, but if not, we won't. */
1771 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
1772 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
1774 if (new_defines_function)
1775 /* If defining a function declared with other language
1776 linkage, use the previously declared language linkage. */
1777 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1778 else if (types_match)
1780 /* If redeclaring a builtin function, and not a definition,
1781 it stays built in. */
1782 if (DECL_BUILT_IN (olddecl))
1784 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1785 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1786 /* If we're keeping the built-in definition, keep the rtl,
1787 regardless of declaration matches. */
1788 COPY_DECL_RTL (olddecl, newdecl);
1791 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1792 /* Don't clear out the arguments if we're redefining a function. */
1793 if (DECL_ARGUMENTS (olddecl))
1794 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1797 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1798 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
1800 /* Now preserve various other info from the definition. */
1801 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
1802 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
1803 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
1804 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1806 /* Warn about conflicting visibility specifications. */
1807 if (DECL_VISIBILITY_SPECIFIED (olddecl)
1808 && DECL_VISIBILITY_SPECIFIED (newdecl)
1809 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
1811 warning (OPT_Wattributes, "%q+D: visibility attribute ignored "
1812 "because it", newdecl);
1813 warning (OPT_Wattributes, "%Jconflicts with previous "
1814 "declaration here", olddecl);
1816 /* Choose the declaration which specified visibility. */
1817 if (DECL_VISIBILITY_SPECIFIED (olddecl))
1819 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
1820 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
1822 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
1823 so keep this behavior. */
1824 if (TREE_CODE (newdecl) == VAR_DECL && DECL_HAS_INIT_PRIORITY_P (newdecl))
1826 SET_DECL_INIT_PRIORITY (olddecl, DECL_INIT_PRIORITY (newdecl));
1827 DECL_HAS_INIT_PRIORITY_P (olddecl) = 1;
1830 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
1831 with that from NEWDECL below. */
1832 if (DECL_LANG_SPECIFIC (olddecl))
1834 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
1835 != DECL_LANG_SPECIFIC (newdecl));
1836 ggc_free (DECL_LANG_SPECIFIC (olddecl));
1839 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1843 function_size = sizeof (struct tree_decl_common);
1845 memcpy ((char *) olddecl + sizeof (struct tree_common),
1846 (char *) newdecl + sizeof (struct tree_common),
1847 function_size - sizeof (struct tree_common));
1849 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
1850 (char *) newdecl + sizeof (struct tree_decl_common),
1851 sizeof (struct tree_function_decl) - sizeof (struct tree_decl_common));
1852 if (DECL_TEMPLATE_INFO (newdecl))
1853 /* If newdecl is a template instantiation, it is possible that
1854 the following sequence of events has occurred:
1856 o A friend function was declared in a class template. The
1857 class template was instantiated.
1859 o The instantiation of the friend declaration was
1860 recorded on the instantiation list, and is newdecl.
1862 o Later, however, instantiate_class_template called pushdecl
1863 on the newdecl to perform name injection. But, pushdecl in
1864 turn called duplicate_decls when it discovered that another
1865 declaration of a global function with the same name already
1868 o Here, in duplicate_decls, we decided to clobber newdecl.
1870 If we're going to do that, we'd better make sure that
1871 olddecl, and not newdecl, is on the list of
1872 instantiations so that if we try to do the instantiation
1873 again we won't get the clobbered declaration. */
1874 reregister_specialization (newdecl,
1875 DECL_TI_TEMPLATE (newdecl),
1880 size_t size = tree_code_size (TREE_CODE (olddecl));
1881 memcpy ((char *) olddecl + sizeof (struct tree_common),
1882 (char *) newdecl + sizeof (struct tree_common),
1883 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
1884 switch (TREE_CODE (olddecl))
1894 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
1895 (char *) newdecl + sizeof (struct tree_decl_common),
1896 size - sizeof (struct tree_decl_common)
1897 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
1901 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
1902 (char *) newdecl + sizeof (struct tree_decl_common),
1903 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)
1904 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
1908 DECL_UID (olddecl) = olddecl_uid;
1910 DECL_FRIEND_P (olddecl) = 1;
1913 DECL_ANTICIPATED (olddecl) = 1;
1914 DECL_HIDDEN_FRIEND_P (olddecl) = 1;
1917 /* NEWDECL contains the merged attribute lists.
1918 Update OLDDECL to be the same. */
1919 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
1921 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
1922 so that encode_section_info has a chance to look at the new decl
1923 flags and attributes. */
1924 if (DECL_RTL_SET_P (olddecl)
1925 && (TREE_CODE (olddecl) == FUNCTION_DECL
1926 || (TREE_CODE (olddecl) == VAR_DECL
1927 && TREE_STATIC (olddecl))))
1928 make_decl_rtl (olddecl);
1930 /* The NEWDECL will no longer be needed. Because every out-of-class
1931 declaration of a member results in a call to duplicate_decls,
1932 freeing these nodes represents in a significant savings. */
1938 /* Return zero if the declaration NEWDECL is valid
1939 when the declaration OLDDECL (assumed to be for the same name)
1940 has already been seen.
1941 Otherwise return an error message format string with a %s
1942 where the identifier should go. */
1945 redeclaration_error_message (tree newdecl, tree olddecl)
1947 if (TREE_CODE (newdecl) == TYPE_DECL)
1949 /* Because C++ can put things into name space for free,
1950 constructs like "typedef struct foo { ... } foo"
1951 would look like an erroneous redeclaration. */
1952 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
1955 return "redefinition of %q#D";
1957 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1959 /* If this is a pure function, its olddecl will actually be
1960 the original initialization to `0' (which we force to call
1961 abort()). Don't complain about redefinition in this case. */
1962 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
1963 && DECL_INITIAL (olddecl) == NULL_TREE)
1966 /* If both functions come from different namespaces, this is not
1967 a redeclaration - this is a conflict with a used function. */
1968 if (DECL_NAMESPACE_SCOPE_P (olddecl)
1969 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
1970 && ! decls_match (olddecl, newdecl))
1971 return "%qD conflicts with used function";
1973 /* We'll complain about linkage mismatches in
1974 warn_extern_redeclared_static. */
1976 /* Defining the same name twice is no good. */
1977 if (DECL_INITIAL (olddecl) != NULL_TREE
1978 && DECL_INITIAL (newdecl) != NULL_TREE)
1980 if (DECL_NAME (olddecl) == NULL_TREE)
1981 return "%q#D not declared in class";
1983 return "redefinition of %q#D";
1987 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1991 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1993 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
1994 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
1995 return "redefinition of %q#D";
1999 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
2000 || (DECL_TEMPLATE_RESULT (newdecl)
2001 == DECL_TEMPLATE_RESULT (olddecl)))
2004 nt = DECL_TEMPLATE_RESULT (newdecl);
2005 if (DECL_TEMPLATE_INFO (nt))
2006 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
2007 ot = DECL_TEMPLATE_RESULT (olddecl);
2008 if (DECL_TEMPLATE_INFO (ot))
2009 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
2010 if (DECL_INITIAL (nt) && DECL_INITIAL (ot))
2011 return "redefinition of %q#D";
2015 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2017 /* Objects declared at top level: */
2018 /* If at least one is a reference, it's ok. */
2019 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2021 /* Reject two definitions. */
2022 return "redefinition of %q#D";
2026 /* Objects declared with block scope: */
2027 /* Reject two definitions, and reject a definition
2028 together with an external reference. */
2029 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2030 return "redeclaration of %q#D";
2035 /* Create a new label, named ID. */
2038 make_label_decl (tree id, int local_p)
2042 decl = build_decl (LABEL_DECL, id, void_type_node);
2044 DECL_CONTEXT (decl) = current_function_decl;
2045 DECL_MODE (decl) = VOIDmode;
2046 C_DECLARED_LABEL_FLAG (decl) = local_p;
2048 /* Say where one reference is to the label, for the sake of the
2049 error if it is not defined. */
2050 DECL_SOURCE_LOCATION (decl) = input_location;
2052 /* Record the fact that this identifier is bound to this label. */
2053 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2058 /* Record this label on the list of used labels so that we can check
2059 at the end of the function to see whether or not the label was
2060 actually defined, and so we can check when the label is defined whether
2061 this use is valid. */
2064 use_label (tree decl)
2066 if (named_label_uses == NULL
2067 || named_label_uses->names_in_scope != current_binding_level->names
2068 || named_label_uses->label_decl != decl)
2070 struct named_label_use_list *new_ent;
2071 new_ent = GGC_NEW (struct named_label_use_list);
2072 new_ent->label_decl = decl;
2073 new_ent->names_in_scope = current_binding_level->names;
2074 new_ent->binding_level = current_binding_level;
2075 new_ent->o_goto_locus = input_location;
2076 new_ent->next = named_label_uses;
2077 named_label_uses = new_ent;
2081 /* Look for a label named ID in the current function. If one cannot
2082 be found, create one. (We keep track of used, but undefined,
2083 labels, and complain about them at the end of a function.) */
2086 lookup_label (tree id)
2089 struct named_label_list *ent;
2091 timevar_push (TV_NAME_LOOKUP);
2092 /* You can't use labels at global scope. */
2093 if (current_function_decl == NULL_TREE)
2095 error ("label %qE referenced outside of any function", id);
2096 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, NULL_TREE);
2099 /* See if we've already got this label. */
2100 decl = IDENTIFIER_LABEL_VALUE (id);
2101 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2102 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2104 /* Record this label on the list of labels used in this function.
2105 We do this before calling make_label_decl so that we get the
2106 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2107 ent = GGC_CNEW (struct named_label_list);
2108 ent->old_value = IDENTIFIER_LABEL_VALUE (id);
2109 ent->next = named_labels;
2112 /* We need a new label. */
2113 decl = make_label_decl (id, /*local_p=*/0);
2115 /* Now fill in the information we didn't have before. */
2116 ent->label_decl = decl;
2118 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2121 /* Declare a local label named ID. */
2124 declare_local_label (tree id)
2128 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2129 this scope we can restore the old value of
2130 IDENTIFIER_TYPE_VALUE. */
2131 current_binding_level->shadowed_labels
2132 = tree_cons (IDENTIFIER_LABEL_VALUE (id), NULL_TREE,
2133 current_binding_level->shadowed_labels);
2134 /* Look for the label. */
2135 decl = make_label_decl (id, /*local_p=*/1);
2136 /* Now fill in the information we didn't have before. */
2137 TREE_VALUE (current_binding_level->shadowed_labels) = decl;
2142 /* Returns nonzero if it is ill-formed to jump past the declaration of
2143 DECL. Returns 2 if it's also a real problem. */
2146 decl_jump_unsafe (tree decl)
2148 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl))
2151 if (DECL_INITIAL (decl) == NULL_TREE
2152 && pod_type_p (TREE_TYPE (decl)))
2155 /* This is really only important if we're crossing an initialization.
2156 The POD stuff is just pedantry; why should it matter if the class
2157 contains a field of pointer to member type? */
2158 if (DECL_INITIAL (decl)
2159 || (TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))))
2164 /* Check that a single previously seen jump to a newly defined label
2165 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2166 the jump context; NAMES are the names in scope in LEVEL at the jump
2167 context; FILE and LINE are the source position of the jump or 0. */
2170 check_previous_goto_1 (tree decl,
2171 struct cp_binding_level* level,
2172 tree names, const location_t *locus)
2176 struct cp_binding_level *b = current_binding_level;
2177 for (; b; b = b->level_chain)
2179 tree new_decls = b->names;
2180 tree old_decls = (b == level ? names : NULL_TREE);
2181 for (; new_decls != old_decls;
2182 new_decls = TREE_CHAIN (new_decls))
2184 int problem = decl_jump_unsafe (new_decls);
2191 pedwarn ("jump to label %qD", decl);
2193 pedwarn ("jump to case label");
2196 pedwarn ("%H from here", locus);
2201 error (" crosses initialization of %q+#D", new_decls);
2203 pedwarn (" enters scope of non-POD %q+#D", new_decls);
2208 if ((b->kind == sk_try || b->kind == sk_catch) && ! saw_eh)
2213 pedwarn ("jump to label %qD", decl);
2215 pedwarn ("jump to case label");
2218 pedwarn ("%H from here", locus);
2221 if (b->kind == sk_try)
2222 error (" enters try block");
2224 error (" enters catch block");
2231 check_previous_goto (struct named_label_use_list* use)
2233 check_previous_goto_1 (use->label_decl, use->binding_level,
2234 use->names_in_scope, &use->o_goto_locus);
2238 check_switch_goto (struct cp_binding_level* level)
2240 check_previous_goto_1 (NULL_TREE, level, level->names, NULL);
2243 /* Check that any previously seen jumps to a newly defined label DECL
2244 are OK. Called by define_label. */
2247 check_previous_gotos (tree decl)
2249 struct named_label_use_list **usep;
2251 if (! TREE_USED (decl))
2254 for (usep = &named_label_uses; *usep; )
2256 struct named_label_use_list *use = *usep;
2257 if (use->label_decl == decl)
2259 check_previous_goto (use);
2263 usep = &(use->next);
2267 /* Check that a new jump to a label DECL is OK. Called by
2268 finish_goto_stmt. */
2271 check_goto (tree decl)
2275 struct named_label_list *lab;
2277 /* We can't know where a computed goto is jumping. So we assume
2279 if (! DECL_P (decl))
2282 /* If the label hasn't been defined yet, defer checking. */
2283 if (! DECL_INITIAL (decl))
2289 for (lab = named_labels; lab; lab = lab->next)
2290 if (decl == lab->label_decl)
2293 /* If the label is not on named_labels it's a gcc local label, so
2294 it must be in an outer scope, so jumping to it is always OK. */
2298 if ((lab->in_try_scope || lab->in_catch_scope || lab->bad_decls)
2301 pedwarn ("jump to label %q+D", decl);
2302 pedwarn (" from here");
2306 for (bad = lab->bad_decls; bad; bad = TREE_CHAIN (bad))
2308 tree b = TREE_VALUE (bad);
2309 int u = decl_jump_unsafe (b);
2311 if (u > 1 && DECL_ARTIFICIAL (b))
2312 /* Can't skip init of __exception_info. */
2313 error ("%J enters catch block", b);
2315 error (" skips initialization of %q+#D", b);
2317 pedwarn (" enters scope of non-POD %q+#D", b);
2320 if (lab->in_try_scope)
2321 error (" enters try block");
2322 else if (lab->in_catch_scope)
2323 error (" enters catch block");
2326 /* Define a label, specifying the location in the source file.
2327 Return the LABEL_DECL node for the label. */
2330 define_label (location_t location, tree name)
2332 tree decl = lookup_label (name);
2333 struct named_label_list *ent;
2334 struct cp_binding_level *p;
2336 timevar_push (TV_NAME_LOOKUP);
2337 for (ent = named_labels; ent; ent = ent->next)
2338 if (ent->label_decl == decl)
2341 /* After labels, make any new cleanups in the function go into their
2342 own new (temporary) binding contour. */
2343 for (p = current_binding_level;
2344 p->kind != sk_function_parms;
2346 p->more_cleanups_ok = 0;
2348 if (name == get_identifier ("wchar_t"))
2349 pedwarn ("label named wchar_t");
2351 if (DECL_INITIAL (decl) != NULL_TREE)
2352 error ("duplicate label %qD", decl);
2355 /* Mark label as having been defined. */
2356 DECL_INITIAL (decl) = error_mark_node;
2357 /* Say where in the source. */
2358 DECL_SOURCE_LOCATION (decl) = location;
2361 ent->names_in_scope = current_binding_level->names;
2362 ent->binding_level = current_binding_level;
2364 check_previous_gotos (decl);
2367 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2372 struct cp_binding_level *level;
2373 struct cp_switch *next;
2374 /* The SWITCH_STMT being built. */
2376 /* A splay-tree mapping the low element of a case range to the high
2377 element, or NULL_TREE if there is no high element. Used to
2378 determine whether or not a new case label duplicates an old case
2379 label. We need a tree, rather than simply a hash table, because
2380 of the GNU case range extension. */
2384 /* A stack of the currently active switch statements. The innermost
2385 switch statement is on the top of the stack. There is no need to
2386 mark the stack for garbage collection because it is only active
2387 during the processing of the body of a function, and we never
2388 collect at that point. */
2390 static struct cp_switch *switch_stack;
2392 /* Called right after a switch-statement condition is parsed.
2393 SWITCH_STMT is the switch statement being parsed. */
2396 push_switch (tree switch_stmt)
2398 struct cp_switch *p = xmalloc (sizeof (struct cp_switch));
2399 p->level = current_binding_level;
2400 p->next = switch_stack;
2401 p->switch_stmt = switch_stmt;
2402 p->cases = splay_tree_new (case_compare, NULL, NULL);
2409 struct cp_switch *cs = switch_stack;
2410 location_t switch_location;
2412 /* Emit warnings as needed. */
2413 if (EXPR_HAS_LOCATION (cs->switch_stmt))
2414 switch_location = EXPR_LOCATION (cs->switch_stmt);
2416 switch_location = input_location;
2417 c_do_switch_warnings (cs->cases, switch_location,
2418 SWITCH_STMT_TYPE (cs->switch_stmt),
2419 SWITCH_STMT_COND (cs->switch_stmt));
2421 splay_tree_delete (cs->cases);
2422 switch_stack = switch_stack->next;
2426 /* Note that we've seen a definition of a case label, and complain if this
2427 is a bad place for one. */
2430 finish_case_label (tree low_value, tree high_value)
2433 struct cp_binding_level *p;
2435 if (processing_template_decl)
2439 /* For templates, just add the case label; we'll do semantic
2440 analysis at instantiation-time. */
2441 label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
2442 return add_stmt (build_case_label (low_value, high_value, label));
2445 /* Find the condition on which this switch statement depends. */
2446 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
2447 if (cond && TREE_CODE (cond) == TREE_LIST)
2448 cond = TREE_VALUE (cond);
2450 r = c_add_case_label (switch_stack->cases, cond, TREE_TYPE (cond),
2451 low_value, high_value);
2453 check_switch_goto (switch_stack->level);
2455 /* After labels, make any new cleanups in the function go into their
2456 own new (temporary) binding contour. */
2457 for (p = current_binding_level;
2458 p->kind != sk_function_parms;
2460 p->more_cleanups_ok = 0;
2465 /* Hash a TYPENAME_TYPE. K is really of type `tree'. */
2468 typename_hash (const void* k)
2473 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
2474 ^ htab_hash_pointer (DECL_NAME (TYPE_NAME (t))));
2479 typedef struct typename_info {
2487 /* Compare two TYPENAME_TYPEs. K1 and K2 are really of type `tree'. */
2490 typename_compare (const void * k1, const void * k2)
2493 const typename_info *t2;
2496 t2 = (const typename_info *) k2;
2498 return (DECL_NAME (TYPE_NAME (t1)) == t2->name
2499 && TYPE_CONTEXT (t1) == t2->scope
2500 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
2501 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
2502 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
2505 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
2506 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
2508 Returns the new TYPENAME_TYPE. */
2510 static GTY ((param_is (union tree_node))) htab_t typename_htab;
2513 build_typename_type (tree context, tree name, tree fullname,
2514 enum tag_types tag_type)
2522 if (typename_htab == NULL)
2523 typename_htab = htab_create_ggc (61, &typename_hash,
2524 &typename_compare, NULL);
2526 ti.scope = FROB_CONTEXT (context);
2528 ti.template_id = fullname;
2529 ti.enum_p = tag_type == enum_type;
2530 ti.class_p = (tag_type == class_type
2531 || tag_type == record_type
2532 || tag_type == union_type);
2533 hash = (htab_hash_pointer (ti.scope)
2534 ^ htab_hash_pointer (ti.name));
2536 /* See if we already have this type. */
2537 e = htab_find_slot_with_hash (typename_htab, &ti, hash, INSERT);
2542 /* Build the TYPENAME_TYPE. */
2543 t = make_aggr_type (TYPENAME_TYPE);
2544 TYPE_CONTEXT (t) = ti.scope;
2545 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
2546 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
2547 TYPENAME_IS_CLASS_P (t) = ti.class_p;
2549 /* Build the corresponding TYPE_DECL. */
2550 d = build_decl (TYPE_DECL, name, t);
2551 TYPE_NAME (TREE_TYPE (d)) = d;
2552 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
2553 DECL_CONTEXT (d) = FROB_CONTEXT (context);
2554 DECL_ARTIFICIAL (d) = 1;
2556 /* Store it in the hash table. */
2563 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
2564 provided to name the type. Returns an appropriate type, unless an
2565 error occurs, in which case error_mark_node is returned. If we
2566 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
2567 return that, rather than the _TYPE it corresponds to, in other
2568 cases we look through the type decl. If TF_ERROR is set, complain
2569 about errors, otherwise be quiet. */
2572 make_typename_type (tree context, tree name, enum tag_types tag_type,
2573 tsubst_flags_t complain)
2577 if (name == error_mark_node
2578 || context == NULL_TREE
2579 || context == error_mark_node)
2580 return error_mark_node;
2584 if (!(TYPE_LANG_SPECIFIC (name)
2585 && (CLASSTYPE_IS_TEMPLATE (name)
2586 || CLASSTYPE_USE_TEMPLATE (name))))
2587 name = TYPE_IDENTIFIER (name);
2589 /* Create a TEMPLATE_ID_EXPR for the type. */
2590 name = build_nt (TEMPLATE_ID_EXPR,
2591 CLASSTYPE_TI_TEMPLATE (name),
2592 CLASSTYPE_TI_ARGS (name));
2594 else if (TREE_CODE (name) == TYPE_DECL)
2595 name = DECL_NAME (name);
2599 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
2601 name = TREE_OPERAND (name, 0);
2602 if (TREE_CODE (name) == TEMPLATE_DECL)
2603 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
2605 if (TREE_CODE (name) == TEMPLATE_DECL)
2607 error ("%qD used without template parameters", name);
2608 return error_mark_node;
2610 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
2611 gcc_assert (TYPE_P (context));
2613 if (!dependent_type_p (context)
2614 || currently_open_class (context))
2616 if (TREE_CODE (fullname) == TEMPLATE_ID_EXPR)
2618 tree tmpl = NULL_TREE;
2619 if (IS_AGGR_TYPE (context))
2620 tmpl = lookup_field (context, name, 0, false);
2621 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
2623 if (complain & tf_error)
2624 error ("no class template named %q#T in %q#T",
2626 return error_mark_node;
2629 if (complain & tf_error)
2630 perform_or_defer_access_check (TYPE_BINFO (context), tmpl);
2632 return lookup_template_class (tmpl,
2633 TREE_OPERAND (fullname, 1),
2635 /*entering_scope=*/0,
2636 tf_error | tf_warning | tf_user);
2642 if (!IS_AGGR_TYPE (context))
2644 if (complain & tf_error)
2645 error ("no type named %q#T in %q#T", name, context);
2646 return error_mark_node;
2649 t = lookup_field (context, name, 0, true);
2652 if (TREE_CODE (t) != TYPE_DECL)
2654 if (complain & tf_error)
2655 error ("no type named %q#T in %q#T", name, context);
2656 return error_mark_node;
2659 if (complain & tf_error)
2660 perform_or_defer_access_check (TYPE_BINFO (context), t);
2662 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
2670 /* If the CONTEXT is not a template type, then either the field is
2671 there now or its never going to be. */
2672 if (!dependent_type_p (context))
2674 if (complain & tf_error)
2675 error ("no type named %q#T in %q#T", name, context);
2676 return error_mark_node;
2679 return build_typename_type (context, name, fullname, tag_type);
2682 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
2683 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
2684 in which case error_mark_node is returned.
2686 If PARM_LIST is non-NULL, also make sure that the template parameter
2687 list of TEMPLATE_DECL matches.
2689 If COMPLAIN zero, don't complain about any errors that occur. */
2692 make_unbound_class_template (tree context, tree name, tree parm_list,
2693 tsubst_flags_t complain)
2699 name = TYPE_IDENTIFIER (name);
2700 else if (DECL_P (name))
2701 name = DECL_NAME (name);
2702 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
2704 if (!dependent_type_p (context)
2705 || currently_open_class (context))
2707 tree tmpl = NULL_TREE;
2709 if (IS_AGGR_TYPE (context))
2710 tmpl = lookup_field (context, name, 0, false);
2712 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
2714 if (complain & tf_error)
2715 error ("no class template named %q#T in %q#T", name, context);
2716 return error_mark_node;
2720 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
2722 if (complain & tf_error)
2724 error ("template parameters do not match template");
2725 error ("%q+D declared here", tmpl);
2727 return error_mark_node;
2730 if (complain & tf_error)
2731 perform_or_defer_access_check (TYPE_BINFO (context), tmpl);
2736 /* Build the UNBOUND_CLASS_TEMPLATE. */
2737 t = make_aggr_type (UNBOUND_CLASS_TEMPLATE);
2738 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
2739 TREE_TYPE (t) = NULL_TREE;
2741 /* Build the corresponding TEMPLATE_DECL. */
2742 d = build_decl (TEMPLATE_DECL, name, t);
2743 TYPE_NAME (TREE_TYPE (d)) = d;
2744 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
2745 DECL_CONTEXT (d) = FROB_CONTEXT (context);
2746 DECL_ARTIFICIAL (d) = 1;
2747 DECL_TEMPLATE_PARMS (d) = parm_list;
2754 /* Push the declarations of builtin types into the namespace.
2755 RID_INDEX is the index of the builtin type in the array
2756 RID_POINTERS. NAME is the name used when looking up the builtin
2757 type. TYPE is the _TYPE node for the builtin type. */
2760 record_builtin_type (enum rid rid_index,
2764 tree rname = NULL_TREE, tname = NULL_TREE;
2765 tree tdecl = NULL_TREE;
2767 if ((int) rid_index < (int) RID_MAX)
2768 rname = ridpointers[(int) rid_index];
2770 tname = get_identifier (name);
2772 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
2773 eliminated. Built-in types should not be looked up name; their
2774 names are keywords that the parser can recognize. However, there
2775 is code in c-common.c that uses identifier_global_value to look
2776 up built-in types by name. */
2779 tdecl = build_decl (TYPE_DECL, tname, type);
2780 DECL_ARTIFICIAL (tdecl) = 1;
2781 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
2787 tdecl = build_decl (TYPE_DECL, rname, type);
2788 DECL_ARTIFICIAL (tdecl) = 1;
2790 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
2793 if (!TYPE_NAME (type))
2794 TYPE_NAME (type) = tdecl;
2797 debug_hooks->type_decl (tdecl, 0);
2800 /* Record one of the standard Java types.
2801 * Declare it as having the given NAME.
2802 * If SIZE > 0, it is the size of one of the integral types;
2803 * otherwise it is the negative of the size of one of the other types. */
2806 record_builtin_java_type (const char* name, int size)
2810 type = make_signed_type (size);
2811 else if (size > -32)
2812 { /* "__java_char" or ""__java_boolean". */
2813 type = make_unsigned_type (-size);
2814 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
2817 { /* "__java_float" or ""__java_double". */
2818 type = make_node (REAL_TYPE);
2819 TYPE_PRECISION (type) = - size;
2822 record_builtin_type (RID_MAX, name, type);
2823 decl = TYPE_NAME (type);
2825 /* Suppress generate debug symbol entries for these types,
2826 since for normal C++ they are just clutter.
2827 However, push_lang_context undoes this if extern "Java" is seen. */
2828 DECL_IGNORED_P (decl) = 1;
2830 TYPE_FOR_JAVA (type) = 1;
2834 /* Push a type into the namespace so that the back-ends ignore it. */
2837 record_unknown_type (tree type, const char* name)
2839 tree decl = pushdecl (build_decl (TYPE_DECL, get_identifier (name), type));
2840 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
2841 DECL_IGNORED_P (decl) = 1;
2842 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
2843 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
2844 TYPE_ALIGN (type) = 1;
2845 TYPE_USER_ALIGN (type) = 0;
2846 TYPE_MODE (type) = TYPE_MODE (void_type_node);
2849 /* A string for which we should create an IDENTIFIER_NODE at
2852 typedef struct predefined_identifier
2854 /* The name of the identifier. */
2855 const char *const name;
2856 /* The place where the IDENTIFIER_NODE should be stored. */
2858 /* Nonzero if this is the name of a constructor or destructor. */
2859 const int ctor_or_dtor_p;
2860 } predefined_identifier;
2862 /* Create all the predefined identifiers. */
2865 initialize_predefined_identifiers (void)
2867 const predefined_identifier *pid;
2869 /* A table of identifiers to create at startup. */
2870 static const predefined_identifier predefined_identifiers[] = {
2871 { "C++", &lang_name_cplusplus, 0 },
2872 { "C", &lang_name_c, 0 },
2873 { "Java", &lang_name_java, 0 },
2874 /* Some of these names have a trailing space so that it is
2875 impossible for them to conflict with names written by users. */
2876 { "__ct ", &ctor_identifier, 1 },
2877 { "__base_ctor ", &base_ctor_identifier, 1 },
2878 { "__comp_ctor ", &complete_ctor_identifier, 1 },
2879 { "__dt ", &dtor_identifier, 1 },
2880 { "__comp_dtor ", &complete_dtor_identifier, 1 },
2881 { "__base_dtor ", &base_dtor_identifier, 1 },
2882 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
2883 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
2884 { "nelts", &nelts_identifier, 0 },
2885 { THIS_NAME, &this_identifier, 0 },
2886 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
2887 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
2888 { "_vptr", &vptr_identifier, 0 },
2889 { "__vtt_parm", &vtt_parm_identifier, 0 },
2890 { "::", &global_scope_name, 0 },
2891 { "std", &std_identifier, 0 },
2895 for (pid = predefined_identifiers; pid->name; ++pid)
2897 *pid->node = get_identifier (pid->name);
2898 if (pid->ctor_or_dtor_p)
2899 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
2903 /* Create the predefined scalar types of C,
2904 and some nodes representing standard constants (0, 1, (void *)0).
2905 Initialize the global binding level.
2906 Make definitions for built-in primitive functions. */
2909 cxx_init_decl_processing (void)
2912 tree void_ftype_ptr;
2914 build_common_tree_nodes (flag_signed_char, false);
2916 /* Create all the identifiers we need. */
2917 initialize_predefined_identifiers ();
2919 /* Create the global variables. */
2920 push_to_top_level ();
2922 current_function_decl = NULL_TREE;
2923 current_binding_level = NULL;
2924 /* Enter the global namespace. */
2925 gcc_assert (global_namespace == NULL_TREE);
2926 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
2928 begin_scope (sk_namespace, global_namespace);
2930 current_lang_name = NULL_TREE;
2932 /* Adjust various flags based on command-line settings. */
2933 if (!flag_permissive)
2934 flag_pedantic_errors = 1;
2935 if (!flag_no_inline)
2937 flag_inline_trees = 1;
2940 if (flag_inline_functions)
2941 flag_inline_trees = 2;
2943 /* Force minimum function alignment if using the least significant
2944 bit of function pointers to store the virtual bit. */
2945 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
2946 && force_align_functions_log < 1)
2947 force_align_functions_log = 1;
2950 current_lang_name = lang_name_c;
2952 error_mark_list = build_tree_list (error_mark_node, error_mark_node);
2953 TREE_TYPE (error_mark_list) = error_mark_node;
2955 /* Create the `std' namespace. */
2956 push_namespace (std_identifier);
2957 std_node = current_namespace;
2960 c_common_nodes_and_builtins ();
2962 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
2963 java_short_type_node = record_builtin_java_type ("__java_short", 16);
2964 java_int_type_node = record_builtin_java_type ("__java_int", 32);
2965 java_long_type_node = record_builtin_java_type ("__java_long", 64);
2966 java_float_type_node = record_builtin_java_type ("__java_float", -32);
2967 java_double_type_node = record_builtin_java_type ("__java_double", -64);
2968 java_char_type_node = record_builtin_java_type ("__java_char", -16);
2969 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
2971 integer_two_node = build_int_cst (NULL_TREE, 2);
2972 integer_three_node = build_int_cst (NULL_TREE, 3);
2974 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
2975 truthvalue_type_node = boolean_type_node;
2976 truthvalue_false_node = boolean_false_node;
2977 truthvalue_true_node = boolean_true_node;
2979 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
2982 record_builtin_type (RID_MAX, NULL, string_type_node);
2985 delta_type_node = ptrdiff_type_node;
2986 vtable_index_type = ptrdiff_type_node;
2988 vtt_parm_type = build_pointer_type (const_ptr_type_node);
2989 void_ftype = build_function_type (void_type_node, void_list_node);
2990 void_ftype_ptr = build_function_type (void_type_node,
2991 tree_cons (NULL_TREE,
2995 = build_exception_variant (void_ftype_ptr, empty_except_spec);
2997 /* C++ extensions */
2999 unknown_type_node = make_node (UNKNOWN_TYPE);
3000 record_unknown_type (unknown_type_node, "unknown type");
3002 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3003 TREE_TYPE (unknown_type_node) = unknown_type_node;
3005 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3007 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
3008 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
3011 /* Make sure we get a unique function type, so we can give
3012 its pointer type a name. (This wins for gdb.) */
3013 tree vfunc_type = make_node (FUNCTION_TYPE);
3014 TREE_TYPE (vfunc_type) = integer_type_node;
3015 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
3016 layout_type (vfunc_type);
3018 vtable_entry_type = build_pointer_type (vfunc_type);
3020 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
3023 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
3024 layout_type (vtbl_type_node);
3025 vtbl_type_node = build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
3026 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
3027 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
3028 layout_type (vtbl_ptr_type_node);
3029 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
3031 push_namespace (get_identifier ("__cxxabiv1"));
3032 abi_node = current_namespace;
3035 global_type_node = make_node (LANG_TYPE);
3036 record_unknown_type (global_type_node, "global type");
3039 current_lang_name = lang_name_cplusplus;
3043 tree bad_alloc_type_node;
3044 tree bad_alloc_decl;
3045 tree newtype, deltype;
3046 tree ptr_ftype_sizetype;
3048 push_namespace (std_identifier);
3049 bad_alloc_id = get_identifier ("bad_alloc");
3050 bad_alloc_type_node = make_aggr_type (RECORD_TYPE);
3051 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3053 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3054 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3055 TYPE_STUB_DECL (bad_alloc_type_node) = bad_alloc_decl;
3059 = build_function_type (ptr_type_node,
3060 tree_cons (NULL_TREE,
3063 newtype = build_exception_variant
3064 (ptr_ftype_sizetype, add_exception_specifier
3065 (NULL_TREE, bad_alloc_type_node, -1));
3066 deltype = build_exception_variant (void_ftype_ptr, empty_except_spec);
3067 push_cp_library_fn (NEW_EXPR, newtype);
3068 push_cp_library_fn (VEC_NEW_EXPR, newtype);
3069 global_delete_fndecl = push_cp_library_fn (DELETE_EXPR, deltype);
3070 push_cp_library_fn (VEC_DELETE_EXPR, deltype);
3074 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype);
3076 /* Perform other language dependent initializations. */
3077 init_class_processing ();
3078 init_rtti_processing ();
3080 if (flag_exceptions)
3081 init_exception_processing ();
3083 if (! supports_one_only ())
3086 make_fname_decl = cp_make_fname_decl;
3087 start_fname_decls ();
3089 /* Show we use EH for cleanups. */
3090 if (flag_exceptions)
3091 using_eh_for_cleanups ();
3094 /* Generate an initializer for a function naming variable from
3095 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
3096 filled in with the type of the init. */
3099 cp_fname_init (const char* name, tree *type_p)
3101 tree domain = NULL_TREE;
3103 tree init = NULL_TREE;
3108 length = strlen (name);
3109 domain = build_index_type (size_int (length));
3110 init = build_string (length + 1, name);
3113 type = build_qualified_type (char_type_node, TYPE_QUAL_CONST);
3114 type = build_cplus_array_type (type, domain);
3119 TREE_TYPE (init) = type;
3121 init = error_mark_node;
3126 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
3127 decl, NAME is the initialization string and TYPE_DEP indicates whether
3128 NAME depended on the type of the function. We make use of that to detect
3129 __PRETTY_FUNCTION__ inside a template fn. This is being done
3130 lazily at the point of first use, so we mustn't push the decl now. */
3133 cp_make_fname_decl (tree id, int type_dep)
3135 const char *const name = (type_dep && processing_template_decl
3136 ? NULL : fname_as_string (type_dep));
3138 tree init = cp_fname_init (name, &type);
3139 tree decl = build_decl (VAR_DECL, id, type);
3142 free ((char *) name);
3144 /* As we're using pushdecl_with_scope, we must set the context. */
3145 DECL_CONTEXT (decl) = current_function_decl;
3146 DECL_PRETTY_FUNCTION_P (decl) = type_dep;
3148 TREE_STATIC (decl) = 1;
3149 TREE_READONLY (decl) = 1;
3150 DECL_ARTIFICIAL (decl) = 1;
3151 DECL_INITIAL (decl) = init;
3153 TREE_USED (decl) = 1;
3155 if (current_function_decl)
3157 struct cp_binding_level *b = current_binding_level;
3158 while (b->level_chain->kind != sk_function_parms)
3160 pushdecl_with_scope (decl, b, /*is_friend=*/false);
3161 cp_finish_decl (decl, init, NULL_TREE, LOOKUP_ONLYCONVERTING);
3164 pushdecl_top_level_and_finish (decl, init);
3169 /* Make a definition for a builtin function named NAME in the current
3170 namespace, whose data type is TYPE and whose context is CONTEXT.
3171 TYPE should be a function type with argument types.
3173 CLASS and CODE tell later passes how to compile calls to this function.
3174 See tree.h for possible values.
3176 If LIBNAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3177 the name to be called if we can't opencode the function.
3178 If ATTRS is nonzero, use that for the function's attribute
3182 builtin_function_1 (const char* name,
3185 enum built_in_function code,
3186 enum built_in_class class,
3187 const char* libname,
3190 tree decl = build_library_fn_1 (get_identifier (name), ERROR_MARK, type);
3191 DECL_BUILT_IN_CLASS (decl) = class;
3192 DECL_FUNCTION_CODE (decl) = code;
3193 DECL_CONTEXT (decl) = context;
3197 /* Since `pushdecl' relies on DECL_ASSEMBLER_NAME instead of DECL_NAME,
3198 we cannot change DECL_ASSEMBLER_NAME until we have installed this
3199 function in the namespace. */
3201 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (libname));
3203 /* A function in the user's namespace should have an explicit
3204 declaration before it is used. Mark the built-in function as
3205 anticipated but not actually declared. */
3206 if (name[0] != '_' || name[1] != '_')
3207 DECL_ANTICIPATED (decl) = 1;
3209 /* Possibly apply some default attributes to this built-in function. */
3211 decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
3213 decl_attributes (&decl, NULL_TREE, 0);
3218 /* Entry point for the benefit of c_common_nodes_and_builtins.
3220 Make a definition for a builtin function named NAME and whose data type
3221 is TYPE. TYPE should be a function type with argument types. This
3222 function places the anticipated declaration in the global namespace
3223 and additionally in the std namespace if appropriate.
3225 CLASS and CODE tell later passes how to compile calls to this function.
3226 See tree.h for possible values.
3228 If LIBNAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3229 the name to be called if we can't opencode the function.
3231 If ATTRS is nonzero, use that for the function's attribute
3235 builtin_function (const char* name,
3238 enum built_in_class cl,
3239 const char* libname,
3242 /* All builtins that don't begin with an '_' should additionally
3243 go in the 'std' namespace. */
3246 push_namespace (std_identifier);
3247 builtin_function_1 (name, type, std_node, code, cl, libname, attrs);
3251 return builtin_function_1 (name, type, NULL_TREE, code,
3252 cl, libname, attrs);
3255 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
3256 function. Not called directly. */
3259 build_library_fn_1 (tree name, enum tree_code operator_code, tree type)
3261 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
3262 DECL_EXTERNAL (fn) = 1;
3263 TREE_PUBLIC (fn) = 1;
3264 DECL_ARTIFICIAL (fn) = 1;
3265 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
3266 SET_DECL_LANGUAGE (fn, lang_c);
3267 /* Runtime library routines are, by definition, available in an
3268 external shared object. */
3269 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
3270 DECL_VISIBILITY_SPECIFIED (fn) = 1;
3274 /* Returns the _DECL for a library function with C linkage.
3275 We assume that such functions never throw; if this is incorrect,
3276 callers should unset TREE_NOTHROW. */
3279 build_library_fn (tree name, tree type)
3281 tree fn = build_library_fn_1 (name, ERROR_MARK, type);
3282 TREE_NOTHROW (fn) = 1;
3286 /* Returns the _DECL for a library function with C++ linkage. */
3289 build_cp_library_fn (tree name, enum tree_code operator_code, tree type)
3291 tree fn = build_library_fn_1 (name, operator_code, type);
3292 TREE_NOTHROW (fn) = TYPE_NOTHROW_P (type);
3293 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
3294 SET_DECL_LANGUAGE (fn, lang_cplusplus);
3298 /* Like build_library_fn, but takes a C string instead of an
3302 build_library_fn_ptr (const char* name, tree type)
3304 return build_library_fn (get_identifier (name), type);
3307 /* Like build_cp_library_fn, but takes a C string instead of an
3311 build_cp_library_fn_ptr (const char* name, tree type)
3313 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type);
3316 /* Like build_library_fn, but also pushes the function so that we will
3317 be able to find it via IDENTIFIER_GLOBAL_VALUE. */
3320 push_library_fn (tree name, tree type)
3322 tree fn = build_library_fn (name, type);
3323 pushdecl_top_level (fn);
3327 /* Like build_cp_library_fn, but also pushes the function so that it
3328 will be found by normal lookup. */
3331 push_cp_library_fn (enum tree_code operator_code, tree type)
3333 tree fn = build_cp_library_fn (ansi_opname (operator_code),
3340 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
3344 push_void_library_fn (tree name, tree parmtypes)
3346 tree type = build_function_type (void_type_node, parmtypes);
3347 return push_library_fn (name, type);
3350 /* Like push_library_fn, but also note that this function throws
3351 and does not return. Used for __throw_foo and the like. */
3354 push_throw_library_fn (tree name, tree type)
3356 tree fn = push_library_fn (name, type);
3357 TREE_THIS_VOLATILE (fn) = 1;
3358 TREE_NOTHROW (fn) = 0;
3362 /* When we call finish_struct for an anonymous union, we create
3363 default copy constructors and such. But, an anonymous union
3364 shouldn't have such things; this function undoes the damage to the
3365 anonymous union type T.
3367 (The reason that we create the synthesized methods is that we don't
3368 distinguish `union { int i; }' from `typedef union { int i; } U'.
3369 The first is an anonymous union; the second is just an ordinary
3373 fixup_anonymous_aggr (tree t)
3377 /* Wipe out memory of synthesized methods. */
3378 TYPE_HAS_CONSTRUCTOR (t) = 0;
3379 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
3380 TYPE_HAS_INIT_REF (t) = 0;
3381 TYPE_HAS_CONST_INIT_REF (t) = 0;
3382 TYPE_HAS_ASSIGN_REF (t) = 0;
3383 TYPE_HAS_CONST_ASSIGN_REF (t) = 0;
3385 /* Splice the implicitly generated functions out of the TYPE_METHODS
3387 q = &TYPE_METHODS (t);
3390 if (DECL_ARTIFICIAL (*q))
3391 *q = TREE_CHAIN (*q);
3393 q = &TREE_CHAIN (*q);
3396 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
3397 if (TYPE_METHODS (t))
3398 error ("%Jan anonymous union cannot have function members",
3399 TYPE_MAIN_DECL (t));
3401 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
3402 assignment operators (because they cannot have these methods themselves).
3403 For anonymous unions this is already checked because they are not allowed
3404 in any union, otherwise we have to check it. */
3405 if (TREE_CODE (t) != UNION_TYPE)
3409 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
3410 if (TREE_CODE (field) == FIELD_DECL)
3412 type = TREE_TYPE (field);
3413 if (CLASS_TYPE_P (type))
3415 if (TYPE_NEEDS_CONSTRUCTING (type))
3416 error ("member %q+#D with constructor not allowed "
3417 "in anonymous aggregate", field);
3418 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
3419 error ("member %q+#D with destructor not allowed "
3420 "in anonymous aggregate", field);
3421 if (TYPE_HAS_COMPLEX_ASSIGN_REF (type))
3422 error ("member %q+#D with copy assignment operator "
3423 "not allowed in anonymous aggregate", field);
3429 /* Make sure that a declaration with no declarator is well-formed, i.e.
3430 just declares a tagged type or anonymous union.
3432 Returns the type declared; or NULL_TREE if none. */
3435 check_tag_decl (cp_decl_specifier_seq *declspecs)
3437 int saw_friend = declspecs->specs[(int)ds_friend] != 0;
3438 int saw_typedef = declspecs->specs[(int)ds_typedef] != 0;
3439 /* If a class, struct, or enum type is declared by the DECLSPECS
3440 (i.e, if a class-specifier, enum-specifier, or non-typename
3441 elaborated-type-specifier appears in the DECLSPECS),
3442 DECLARED_TYPE is set to the corresponding type. */
3443 tree declared_type = NULL_TREE;
3444 bool error_p = false;
3446 if (declspecs->multiple_types_p)
3447 error ("multiple types in one declaration");
3448 else if (declspecs->redefined_builtin_type)
3450 if (!in_system_header)
3451 pedwarn ("redeclaration of C++ built-in type %qT",
3452 declspecs->redefined_builtin_type);
3457 && TYPE_P (declspecs->type)
3458 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
3459 && IS_AGGR_TYPE (declspecs->type))
3460 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
3461 declared_type = declspecs->type;
3462 else if (declspecs->type == error_mark_node)
3464 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
3465 pedwarn ("declaration does not declare anything");
3466 /* Check for an anonymous union. */
3467 else if (declared_type && IS_AGGR_TYPE_CODE (TREE_CODE (declared_type))
3468 && TYPE_ANONYMOUS_P (declared_type))
3470 /* 7/3 In a simple-declaration, the optional init-declarator-list
3471 can be omitted only when declaring a class (clause 9) or
3472 enumeration (7.2), that is, when the decl-specifier-seq contains
3473 either a class-specifier, an elaborated-type-specifier with
3474 a class-key (9.1), or an enum-specifier. In these cases and
3475 whenever a class-specifier or enum-specifier is present in the
3476 decl-specifier-seq, the identifiers in these specifiers are among
3477 the names being declared by the declaration (as class-name,
3478 enum-names, or enumerators, depending on the syntax). In such
3479 cases, and except for the declaration of an unnamed bit-field (9.6),
3480 the decl-specifier-seq shall introduce one or more names into the
3481 program, or shall redeclare a name introduced by a previous
3482 declaration. [Example:
3483 enum { }; // ill-formed
3484 typedef class { }; // ill-formed
3488 error ("missing type-name in typedef-declaration");
3491 /* Anonymous unions are objects, so they can have specifiers. */;
3492 SET_ANON_AGGR_TYPE_P (declared_type);
3494 if (TREE_CODE (declared_type) != UNION_TYPE && pedantic
3495 && !in_system_header)
3496 pedwarn ("ISO C++ prohibits anonymous structs");
3501 if (declspecs->specs[(int)ds_inline]
3502 || declspecs->specs[(int)ds_virtual])
3503 error ("%qs can only be specified for functions",
3504 declspecs->specs[(int)ds_inline]
3505 ? "inline" : "virtual");
3507 && (!current_class_type
3508 || current_scope () != current_class_type))
3509 error ("%<friend%> can only be specified inside a class");
3510 else if (declspecs->specs[(int)ds_explicit])
3511 error ("%<explicit%> can only be specified for constructors");
3512 else if (declspecs->storage_class)
3513 error ("a storage class can only be specified for objects "
3515 else if (declspecs->specs[(int)ds_const]
3516 || declspecs->specs[(int)ds_volatile]
3517 || declspecs->specs[(int)ds_restrict]
3518 || declspecs->specs[(int)ds_thread])
3519 error ("qualifiers can only be specified for objects "
3523 return declared_type;
3526 /* Called when a declaration is seen that contains no names to declare.
3527 If its type is a reference to a structure, union or enum inherited
3528 from a containing scope, shadow that tag name for the current scope
3529 with a forward reference.
3530 If its type defines a new named structure or union
3531 or defines an enum, it is valid but we need not do anything here.
3532 Otherwise, it is an error.
3534 C++: may have to grok the declspecs to learn about static,
3535 complain for anonymous unions.
3537 Returns the TYPE declared -- or NULL_TREE if none. */
3540 shadow_tag (cp_decl_specifier_seq *declspecs)
3542 tree t = check_tag_decl (declspecs);
3547 if (declspecs->attributes)
3549 warning (0, "attribute ignored in declaration of %q+#T", t);
3550 warning (0, "attribute for %q+#T must follow the %qs keyword",
3551 t, class_key_or_enum_as_string (t));
3555 maybe_process_partial_specialization (t);
3557 /* This is where the variables in an anonymous union are
3558 declared. An anonymous union declaration looks like:
3560 because there is no declarator after the union, the parser
3561 sends that declaration here. */
3562 if (ANON_AGGR_TYPE_P (t))
3564 fixup_anonymous_aggr (t);
3566 if (TYPE_FIELDS (t))
3568 tree decl = grokdeclarator (/*declarator=*/NULL,
3569 declspecs, NORMAL, 0, NULL);
3570 finish_anon_union (decl);
3577 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3580 groktypename (cp_decl_specifier_seq *type_specifiers,
3581 const cp_declarator *declarator)
3585 attrs = type_specifiers->attributes;
3586 type_specifiers->attributes = NULL_TREE;
3587 type = grokdeclarator (declarator, type_specifiers, TYPENAME, 0, &attrs);
3589 cplus_decl_attributes (&type, attrs, 0);
3593 /* Decode a declarator in an ordinary declaration or data definition.
3594 This is called as soon as the type information and variable name
3595 have been parsed, before parsing the initializer if any.
3596 Here we create the ..._DECL node, fill in its type,
3597 and put it on the list of decls for the current context.
3598 The ..._DECL node is returned as the value.
3600 Exception: for arrays where the length is not specified,
3601 the type is left null, to be filled in by `cp_finish_decl'.
3603 Function definitions do not come here; they go to start_function
3604 instead. However, external and forward declarations of functions
3605 do go through here. Structure field declarations are done by
3606 grokfield and not through here. */
3609 start_decl (const cp_declarator *declarator,
3610 cp_decl_specifier_seq *declspecs,
3613 tree prefix_attributes,
3614 tree *pushed_scope_p)
3620 *pushed_scope_p = NULL_TREE;
3622 /* This should only be done once on the top most decl. */
3623 if (have_extern_spec)
3625 declspecs->storage_class = sc_extern;
3626 have_extern_spec = false;
3629 /* An object declared as __attribute__((deprecated)) suppresses
3630 warnings of uses of other deprecated items. */
3631 if (lookup_attribute ("deprecated", attributes))
3632 deprecated_state = DEPRECATED_SUPPRESS;
3634 attributes = chainon (attributes, prefix_attributes);
3636 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
3639 deprecated_state = DEPRECATED_NORMAL;
3641 if (decl == NULL_TREE || TREE_CODE (decl) == VOID_TYPE)
3642 return error_mark_node;
3644 type = TREE_TYPE (decl);
3646 if (type == error_mark_node)
3647 return error_mark_node;
3649 context = DECL_CONTEXT (decl);
3653 *pushed_scope_p = push_scope (context);
3655 /* We are only interested in class contexts, later. */
3656 if (TREE_CODE (context) == NAMESPACE_DECL)
3657 context = NULL_TREE;
3661 /* Is it valid for this decl to have an initializer at all?
3662 If not, set INITIALIZED to zero, which will indirectly
3663 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
3664 switch (TREE_CODE (decl))
3667 error ("typedef %qD is initialized (use __typeof__ instead)", decl);
3672 error ("function %q#D is initialized like a variable", decl);
3682 if (! toplevel_bindings_p ()
3683 && DECL_EXTERNAL (decl))
3684 warning (0, "declaration of %q#D has %<extern%> and is initialized",
3686 DECL_EXTERNAL (decl) = 0;
3687 if (toplevel_bindings_p ())
3688 TREE_STATIC (decl) = 1;
3690 /* Tell `pushdecl' this is an initialized decl
3691 even though we don't yet have the initializer expression.
3692 Also tell `cp_finish_decl' it may store the real initializer. */
3693 DECL_INITIAL (decl) = error_mark_node;
3696 /* Set attributes here so if duplicate decl, will have proper attributes. */
3697 cplus_decl_attributes (&decl, attributes, 0);
3699 /* If #pragma weak was used, mark the decl weak now. */
3700 maybe_apply_pragma_weak (decl);
3702 if (TREE_CODE (decl) == FUNCTION_DECL
3703 && DECL_DECLARED_INLINE_P (decl)
3704 && DECL_UNINLINABLE (decl)
3705 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
3706 warning (0, "inline function %q+D given attribute noinline", decl);
3708 if (context && COMPLETE_TYPE_P (complete_type (context)))
3710 if (TREE_CODE (decl) == VAR_DECL)
3712 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
3713 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
3714 error ("%q#D is not a static member of %q#T", decl, context);
3717 if (DECL_CONTEXT (field) != context)
3719 if (!same_type_p (DECL_CONTEXT (field), context))
3720 pedwarn ("ISO C++ does not permit %<%T::%D%> "
3721 "to be defined as %<%T::%D%>",
3722 DECL_CONTEXT (field), DECL_NAME (decl),
3723 context, DECL_NAME (decl));
3724 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
3726 if (processing_specialization
3727 && template_class_depth (context) == 0
3728 && CLASSTYPE_TEMPLATE_SPECIALIZATION (context))
3729 error ("template header not allowed in member definition "
3730 "of explicitly specialized class");
3731 /* Static data member are tricky; an in-class initialization
3732 still doesn't provide a definition, so the in-class
3733 declaration will have DECL_EXTERNAL set, but will have an
3734 initialization. Thus, duplicate_decls won't warn
3735 about this situation, and so we check here. */
3736 if (DECL_INITIAL (decl)
3737 && DECL_INITIALIZED_IN_CLASS_P (field))
3738 error ("duplicate initialization of %qD", decl);
3739 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
3745 tree field = check_classfn (context, decl,
3746 (processing_template_decl
3747 > template_class_depth (context))
3748 ? current_template_parms
3750 if (field && duplicate_decls (decl, field,
3751 /*newdecl_is_friend=*/false))
3755 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
3756 DECL_IN_AGGR_P (decl) = 0;
3757 /* Do not mark DECL as an explicit specialization if it was not
3758 already marked as an instantiation; a declaration should
3759 never be marked as a specialization unless we know what
3760 template is being specialized. */
3761 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
3763 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
3765 /* [temp.expl.spec] An explicit specialization of a static data
3766 member of a template is a definition if the declaration
3767 includes an initializer; otherwise, it is a declaration.
3769 We check for processing_specialization so this only applies
3770 to the new specialization syntax. */
3771 if (!DECL_INITIAL (decl)
3772 && processing_specialization)
3773 DECL_EXTERNAL (decl) = 1;
3776 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl))
3777 pedwarn ("declaration of %q#D outside of class is not definition",
3781 /* Enter this declaration into the symbol table. */
3782 tem = maybe_push_decl (decl);
3784 if (processing_template_decl)
3785 tem = push_template_decl (tem);
3786 if (tem == error_mark_node)
3787 return error_mark_node;
3789 #if ! defined (ASM_OUTPUT_BSS) && ! defined (ASM_OUTPUT_ALIGNED_BSS)
3790 /* Tell the back-end to use or not use .common as appropriate. If we say
3791 -fconserve-space, we want this to save .data space, at the expense of
3792 wrong semantics. If we say -fno-conserve-space, we want this to
3793 produce errors about redefs; to do this we force variables into the
3795 DECL_COMMON (tem) = ((TREE_CODE (tem) != VAR_DECL
3796 || !DECL_THREAD_LOCAL_P (tem))
3797 && (flag_conserve_space || ! TREE_PUBLIC (tem)));
3800 if (! processing_template_decl)
3807 start_decl_1 (tree decl)
3809 tree type = TREE_TYPE (decl);
3810 int initialized = (DECL_INITIAL (decl) != NULL_TREE);
3812 if (type == error_mark_node)
3816 /* Is it valid for this decl to have an initializer at all?
3817 If not, set INITIALIZED to zero, which will indirectly
3818 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
3820 /* Don't allow initializations for incomplete types except for
3821 arrays which might be completed by the initialization. */
3822 if (COMPLETE_TYPE_P (complete_type (type)))
3823 ; /* A complete type is ok. */
3824 else if (TREE_CODE (type) != ARRAY_TYPE)
3826 error ("variable %q#D has initializer but incomplete type", decl);
3828 type = TREE_TYPE (decl) = error_mark_node;
3830 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
3832 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
3833 error ("elements of array %q#D have incomplete type", decl);
3834 /* else we already gave an error in start_decl. */
3840 && TREE_CODE (decl) != TYPE_DECL
3841 && TREE_CODE (decl) != TEMPLATE_DECL
3842 && type != error_mark_node
3843 && IS_AGGR_TYPE (type)
3844 && ! DECL_EXTERNAL (decl))
3846 if ((! processing_template_decl || ! uses_template_parms (type))
3847 && !COMPLETE_TYPE_P (complete_type (type)))
3849 error ("aggregate %q#D has incomplete type and cannot be defined",
3851 /* Change the type so that assemble_variable will give
3852 DECL an rtl we can live with: (mem (const_int 0)). */
3853 type = TREE_TYPE (decl) = error_mark_node;
3857 /* If any base type in the hierarchy of TYPE needs a constructor,
3858 then we set initialized to 1. This way any nodes which are
3859 created for the purposes of initializing this aggregate
3860 will live as long as it does. This is necessary for global
3861 aggregates which do not have their initializers processed until
3862 the end of the file. */
3863 initialized = TYPE_NEEDS_CONSTRUCTING (type);
3868 DECL_INITIAL (decl) = NULL_TREE;
3870 /* Create a new scope to hold this declaration if necessary.
3871 Whether or not a new scope is necessary cannot be determined
3872 until after the type has been completed; if the type is a
3873 specialization of a class template it is not until after
3874 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
3875 will be set correctly. */
3876 maybe_push_cleanup_level (type);
3879 /* Handle initialization of references. DECL, TYPE, and INIT have the
3880 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
3881 but will be set to a new CLEANUP_STMT if a temporary is created
3882 that must be destroyed subsequently.
3884 Returns an initializer expression to use to initialize DECL, or
3885 NULL if the initialization can be performed statically.
3887 Quotes on semantics can be found in ARM 8.4.3. */
3890 grok_reference_init (tree decl, tree type, tree init, tree *cleanup)
3894 if (init == NULL_TREE)
3896 if ((DECL_LANG_SPECIFIC (decl) == 0
3897 || DECL_IN_AGGR_P (decl) == 0)
3898 && ! DECL_THIS_EXTERN (decl))
3899 error ("%qD declared as reference but not initialized", decl);
3903 if (TREE_CODE (init) == CONSTRUCTOR)
3905 error ("ISO C++ forbids use of initializer list to "
3906 "initialize reference %qD", decl);
3910 if (TREE_CODE (init) == TREE_LIST)
3911 init = build_x_compound_expr_from_list (init, "initializer");
3913 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
3914 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
3915 /* Note: default conversion is only called in very special cases. */
3916 init = decay_conversion (init);
3918 /* Convert INIT to the reference type TYPE. This may involve the
3919 creation of a temporary, whose lifetime must be the same as that
3920 of the reference. If so, a DECL_EXPR for the temporary will be
3921 added just after the DECL_EXPR for DECL. That's why we don't set
3922 DECL_INITIAL for local references (instead assigning to them
3923 explicitly); we need to allow the temporary to be initialized
3925 tmp = initialize_reference (type, init, decl, cleanup);
3927 if (tmp == error_mark_node)
3929 else if (tmp == NULL_TREE)
3931 error ("cannot initialize %qT from %qT", type, TREE_TYPE (init));
3935 if (TREE_STATIC (decl) && !TREE_CONSTANT (tmp))
3938 DECL_INITIAL (decl) = tmp;
3943 /* When parsing `int a[] = {1, 2};' we don't know the size of the
3944 array until we finish parsing the initializer. If that's the
3945 situation we're in, update DECL accordingly. */
3948 maybe_deduce_size_from_array_init (tree decl, tree init)
3950 tree type = TREE_TYPE (decl);
3952 if (TREE_CODE (type) == ARRAY_TYPE
3953 && TYPE_DOMAIN (type) == NULL_TREE
3954 && TREE_CODE (decl) != TYPE_DECL)
3956 /* do_default is really a C-ism to deal with tentative definitions.
3957 But let's leave it here to ease the eventual merge. */
3958 int do_default = !DECL_EXTERNAL (decl);
3959 tree initializer = init ? init : DECL_INITIAL (decl);
3960 int failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
3964 error ("initializer fails to determine size of %qD", decl);
3969 error ("array size missing in %qD", decl);
3970 /* If a `static' var's size isn't known, make it extern as
3971 well as static, so it does not get allocated. If it's not
3972 `static', then don't mark it extern; finish_incomplete_decl
3973 will give it a default size and it will get allocated. */
3974 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
3975 DECL_EXTERNAL (decl) = 1;
3979 error ("zero-size array %qD", decl);
3981 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
3983 layout_decl (decl, 0);
3987 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
3988 any appropriate error messages regarding the layout. */
3991 layout_var_decl (tree decl)
3993 tree type = TREE_TYPE (decl);
3995 /* If we haven't already layed out this declaration, do so now.
3996 Note that we must not call complete type for an external object
3997 because it's type might involve templates that we are not
3998 supposed to instantiate yet. (And it's perfectly valid to say
3999 `extern X x' for some incomplete type `X'.) */
4000 if (!DECL_EXTERNAL (decl))
4001 complete_type (type);
4002 if (!DECL_SIZE (decl)
4003 && TREE_TYPE (decl) != error_mark_node
4004 && (COMPLETE_TYPE_P (type)
4005 || (TREE_CODE (type) == ARRAY_TYPE
4006 && !TYPE_DOMAIN (type)
4007 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
4008 layout_decl (decl, 0);
4010 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
4012 /* An automatic variable with an incomplete type: that is an error.
4013 Don't talk about array types here, since we took care of that
4014 message in grokdeclarator. */
4015 error ("storage size of %qD isn't known", decl);
4016 TREE_TYPE (decl) = error_mark_node;
4019 /* Keep this code around in case we later want to control debug info
4020 based on whether a type is "used". (jason 1999-11-11) */
4022 else if (!DECL_EXTERNAL (decl) && IS_AGGR_TYPE (ttype))
4023 /* Let debugger know it should output info for this type. */
4024 note_debug_info_needed (ttype);
4026 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4027 note_debug_info_needed (DECL_CONTEXT (decl));
4030 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4031 && DECL_SIZE (decl) != NULL_TREE
4032 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4034 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4035 constant_expression_warning (DECL_SIZE (decl));
4037 error ("storage size of %qD isn't constant", decl);
4040 if (TREE_STATIC (decl)
4041 && !DECL_ARTIFICIAL (decl)
4042 && current_function_decl
4043 && DECL_CONTEXT (decl) == current_function_decl)
4044 push_local_name (decl);
4047 /* If a local static variable is declared in an inline function, or if
4048 we have a weak definition, we must endeavor to create only one
4049 instance of the variable at link-time. */
4052 maybe_commonize_var (tree decl)
4054 /* Static data in a function with comdat linkage also has comdat
4056 if (TREE_STATIC (decl)
4057 /* Don't mess with __FUNCTION__. */
4058 && ! DECL_ARTIFICIAL (decl)
4059 && DECL_FUNCTION_SCOPE_P (decl)
4060 /* Unfortunately, import_export_decl has not always been called
4061 before the function is processed, so we cannot simply check
4063 && (DECL_COMDAT (DECL_CONTEXT (decl))
4064 || ((DECL_DECLARED_INLINE_P (DECL_CONTEXT (decl))
4065 || DECL_TEMPLATE_INSTANTIATION (DECL_CONTEXT (decl)))
4066 && TREE_PUBLIC (DECL_CONTEXT (decl)))))
4070 /* With weak symbols, we simply make the variable COMDAT;
4071 that will cause copies in multiple translations units to
4073 comdat_linkage (decl);
4077 if (DECL_INITIAL (decl) == NULL_TREE
4078 || DECL_INITIAL (decl) == error_mark_node)
4080 /* Without weak symbols, we can use COMMON to merge
4081 uninitialized variables. */
4082 TREE_PUBLIC (decl) = 1;
4083 DECL_COMMON (decl) = 1;
4087 /* While for initialized variables, we must use internal
4088 linkage -- which means that multiple copies will not
4090 TREE_PUBLIC (decl) = 0;
4091 DECL_COMMON (decl) = 0;
4092 warning (0, "sorry: semantics of inline function static "
4093 "data %q+#D are wrong (you'll wind up "
4094 "with multiple copies)", decl);
4095 warning (0, "%J you can work around this by removing "
4101 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4102 /* Set it up again; we might have set DECL_INITIAL since the last
4104 comdat_linkage (decl);
4107 /* Issue an error message if DECL is an uninitialized const variable. */
4110 check_for_uninitialized_const_var (tree decl)
4112 tree type = TREE_TYPE (decl);
4114 /* ``Unless explicitly declared extern, a const object does not have
4115 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4117 if (TREE_CODE (decl) == VAR_DECL
4118 && TREE_CODE (type) != REFERENCE_TYPE
4119 && CP_TYPE_CONST_P (type)
4120 && !TYPE_NEEDS_CONSTRUCTING (type)
4121 && !DECL_INITIAL (decl))
4122 error ("uninitialized const %qD", decl);
4126 /* Structure holding the current initializer being processed by reshape_init.
4127 CUR is a pointer to the current element being processed, END is a pointer
4128 after the last element present in the initializer. */
4129 typedef struct reshape_iterator_t
4131 constructor_elt *cur;
4132 constructor_elt *end;
4135 static tree reshape_init_r (tree, reshape_iter *, bool);
4137 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4138 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4139 initialized. If there are no more such fields, the return value
4143 next_initializable_field (tree field)
4146 && (TREE_CODE (field) != FIELD_DECL
4147 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4148 || DECL_ARTIFICIAL (field)))
4149 field = TREE_CHAIN (field);
4154 /* Subroutine of reshape_init_array and reshape_init_vector, which does
4155 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
4156 INTEGER_CST representing the size of the array minus one (the maximum index),
4157 or NULL_TREE if the array was declared without specifying the size. D is
4158 the iterator within the constructor. */
4161 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d)
4164 bool sized_array_p = (max_index != NULL_TREE);
4165 unsigned HOST_WIDE_INT max_index_cst = 0;
4166 unsigned HOST_WIDE_INT index;
4168 /* The initializer for an array is always a CONSTRUCTOR. */
4169 new_init = build_constructor (NULL_TREE, NULL);
4173 if (host_integerp (max_index, 1))
4174 max_index_cst = tree_low_cst (max_index, 1);
4175 /* sizetype is sign extended, not zero extended. */
4177 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
4181 /* Loop until there are no more initializers. */
4183 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
4190 /* Handle array designated initializers (GNU extension). */
4191 if (TREE_CODE (d->cur->index) == IDENTIFIER_NODE)
4193 error ("name %qD used in a GNU-style designated "
4194 "initializer for an array", d->cur->index);
4200 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false);
4201 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), NULL_TREE, elt_init);
4207 /* Subroutine of reshape_init_r, processes the initializers for arrays.
4208 Parameters are the same of reshape_init_r. */
4211 reshape_init_array (tree type, reshape_iter *d)
4213 tree max_index = NULL_TREE;
4215 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
4217 if (TYPE_DOMAIN (type))
4218 max_index = array_type_nelts (type);
4220 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4223 /* Subroutine of reshape_init_r, processes the initializers for vectors.
4224 Parameters are the same of reshape_init_r. */
4227 reshape_init_vector (tree type, reshape_iter *d)
4229 tree max_index = NULL_TREE;
4232 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
4234 if (TREE_CODE (d->cur->value) == CONSTRUCTOR
4235 && TREE_HAS_CONSTRUCTOR (d->cur->value))
4237 tree value = d->cur->value;
4238 if (!same_type_p (TREE_TYPE (value), type))
4240 error ("invalid type %qT as initializer for a vector of type %qT",
4241 TREE_TYPE (d->cur->value), type);
4242 value = error_mark_node;
4248 /* For a vector, the representation type is a struct
4249 containing a single member which is an array of the
4250 appropriate size. */
4251 rtype = TYPE_DEBUG_REPRESENTATION_TYPE (type);
4252 if (rtype && TYPE_DOMAIN (TREE_TYPE (TYPE_FIELDS (rtype))))
4253 max_index = array_type_nelts (TREE_TYPE (TYPE_FIELDS (rtype)));
4255 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4258 /* Subroutine of reshape_init_r, processes the initializers for classes
4259 or union. Parameters are the same of reshape_init_r. */
4262 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p)
4267 gcc_assert (CLASS_TYPE_P (type));
4269 /* The initializer for a class is always a CONSTRUCTOR. */
4270 new_init = build_constructor (NULL_TREE, NULL);
4271 field = next_initializable_field (TYPE_FIELDS (type));
4277 An initializer for an aggregate member that is an
4278 empty class shall have the form of an empty
4279 initializer-list {}. */
4280 if (!first_initializer_p)
4282 error ("initializer for %qT must be brace-enclosed", type);
4283 return error_mark_node;
4288 /* Loop through the initializable fields, gathering initializers. */
4289 while (d->cur != d->end)
4293 /* Handle designated initializers, as an extension. */
4297 pedwarn ("ISO C++ does not allow designated initializers");
4299 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
4301 if (!field || TREE_CODE (field) != FIELD_DECL)
4302 error ("%qT has no non-static data member named %qD", type,
4306 /* If we processed all the member of the class, we are done. */
4310 field_init = reshape_init_r (TREE_TYPE (field), d,
4311 /*first_initializer_p=*/false);
4312 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
4316 When a union is initialized with a brace-enclosed
4317 initializer, the braces shall only contain an
4318 initializer for the first member of the union. */
4319 if (TREE_CODE (type) == UNION_TYPE)
4322 field = next_initializable_field (TREE_CHAIN (field));
4328 /* Subroutine of reshape_init, which processes a single initializer (part of
4329 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
4330 iterator within the CONSTRUCTOR which points to the initializer to process.
4331 FIRST_INITIALIZER_P is true if this is the first initializer of the
4332 CONSTRUCTOR node. */
4335 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p)
4337 tree init = d->cur->value;
4339 /* A non-aggregate type is always initialized with a single
4341 if (!CP_AGGREGATE_TYPE_P (type))
4343 /* It is invalid to initialize a non-aggregate type with a
4344 brace-enclosed initializer.
4345 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
4346 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
4347 a CONSTRUCTOR (with a record type). */
4348 if (TREE_CODE (init) == CONSTRUCTOR
4349 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
4351 error ("braces around scalar initializer for type %qT", type);
4352 init = error_mark_node;
4361 All implicit type conversions (clause _conv_) are considered when
4362 initializing the aggregate member with an initializer from an
4363 initializer-list. If the initializer can initialize a member,
4364 the member is initialized. Otherwise, if the member is itself a
4365 non-empty subaggregate, brace elision is assumed and the
4366 initializer is considered for the initialization of the first
4367 member of the subaggregate. */
4368 if (TREE_CODE (init) != CONSTRUCTOR
4369 && can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL))
4375 /* [dcl.init.string]
4377 A char array (whether plain char, signed char, or unsigned char)
4378 can be initialized by a string-literal (optionally enclosed in
4379 braces); a wchar_t array can be initialized by a wide
4380 string-literal (optionally enclosed in braces). */
4381 if (TREE_CODE (type) == ARRAY_TYPE
4382 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
4384 tree str_init = init;
4386 /* Strip one level of braces if and only if they enclose a single
4387 element (as allowed by [dcl.init.string]). */
4388 if (!first_initializer_p
4389 && TREE_CODE (str_init) == CONSTRUCTOR
4390 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (str_init)) == 1)
4392 str_init = VEC_index (constructor_elt,
4393 CONSTRUCTOR_ELTS (str_init), 0)->value;
4396 /* If it's a string literal, then it's the initializer for the array
4397 as a whole. Otherwise, continue with normal initialization for
4398 array types (one value per array element). */
4399 if (TREE_CODE (str_init) == STRING_CST)
4406 /* The following cases are about aggregates. If we are not within a full
4407 initializer already, and there is not a CONSTRUCTOR, it means that there
4408 is a missing set of braces (that is, we are processing the case for
4409 which reshape_init exists). */
4410 if (!first_initializer_p)
4412 if (TREE_CODE (init) == CONSTRUCTOR)
4414 /* For a nested compound literal, there is no need to reshape since
4415 brace elision is not allowed. Even if we decided to allow it,
4416 we should add a call to reshape_init in finish_compound_literal,
4417 before calling digest_init, so changing this code would still
4418 not be necessary. */
4419 if (!TREE_HAS_CONSTRUCTOR (init))
4422 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
4423 return reshape_init (type, init);
4426 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
4429 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
4433 /* Dispatch to specialized routines. */
4434 if (CLASS_TYPE_P (type))
4435 return reshape_init_class (type, d, first_initializer_p);
4436 else if (TREE_CODE (type) == ARRAY_TYPE)
4437 return reshape_init_array (type, d);
4438 else if (TREE_CODE (type) == VECTOR_TYPE)
4439 return reshape_init_vector (type, d);
4444 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
4445 brace-enclosed aggregate initializer.
4447 INIT is the CONSTRUCTOR containing the list of initializers describing
4448 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
4449 It may not presently match the shape of the TYPE; for example:
4451 struct S { int a; int b; };
4452 struct S a[] = { 1, 2, 3, 4 };
4454 Here INIT will hold a VEC of four elements, rather than a
4455 VEC of two elements, each itself a VEC of two elements. This
4456 routine transforms INIT from the former form into the latter. The
4457 revised CONSTRUCTOR node is returned. */
4460 reshape_init (tree type, tree init)
4462 VEC(constructor_elt, gc) *v;
4466 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
4467 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
4469 v = CONSTRUCTOR_ELTS (init);
4471 /* An empty constructor does not need reshaping, and it is always a valid
4473 if (VEC_empty (constructor_elt, v))
4476 /* Recurse on this CONSTRUCTOR. */
4477 d.cur = VEC_index (constructor_elt, v, 0);
4478 d.end = d.cur + VEC_length (constructor_elt, v);
4480 new_init = reshape_init_r (type, &d, true);
4482 /* Make sure all the element of the constructor were used. Otherwise,
4483 issue an error about exceeding initializers. */
4485 error ("too many initializers for %qT", type);
4490 /* Verify INIT (the initializer for DECL), and record the
4491 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
4492 grok_reference_init.
4494 If the return value is non-NULL, it is an expression that must be
4495 evaluated dynamically to initialize DECL. */
4498 check_initializer (tree decl, tree init, int flags, tree *cleanup)
4500 tree type = TREE_TYPE (decl);
4501 tree init_code = NULL;
4503 /* If `start_decl' didn't like having an initialization, ignore it now. */
4504 if (init != NULL_TREE && DECL_INITIAL (decl) == NULL_TREE)
4507 /* If an initializer is present, DECL_INITIAL has been
4508 error_mark_node, to indicate that an as-of-yet unevaluated
4509 initialization will occur. From now on, DECL_INITIAL reflects
4510 the static initialization -- if any -- of DECL. */
4511 DECL_INITIAL (decl) = NULL_TREE;
4513 /* Things that are going to be initialized need to have complete
4515 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
4517 if (type == error_mark_node)
4518 /* We will have already complained. */
4520 else if (init && COMPLETE_TYPE_P (type)
4521 && !TREE_CONSTANT (TYPE_SIZE (type)))
4523 error ("variable-sized object %qD may not be initialized", decl);
4526 else if (TREE_CODE (type) == ARRAY_TYPE
4527 && !COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4529 error ("elements of array %q#D have incomplete type", decl);
4532 else if (TREE_CODE (type) != ARRAY_TYPE && !COMPLETE_TYPE_P (type))
4534 error ("%qD has incomplete type", decl);
4535 TREE_TYPE (decl) = error_mark_node;
4539 if (TREE_CODE (decl) == CONST_DECL)
4541 gcc_assert (TREE_CODE (decl) != REFERENCE_TYPE);
4543 DECL_INITIAL (decl) = init;
4545 gcc_assert (init != NULL_TREE);
4548 else if (!DECL_EXTERNAL (decl) && TREE_CODE (type) == REFERENCE_TYPE)
4549 init = grok_reference_init (decl, type, init, cleanup);
4552 /* Do not reshape constructors of vectors (they don't need to be
4554 if (TREE_CODE (init) == CONSTRUCTOR
4555 && !TREE_HAS_CONSTRUCTOR (init)
4556 && !TREE_TYPE (init)) /* ptrmemfunc */
4558 init = reshape_init (type, init);
4560 if ((*targetm.vector_opaque_p) (type))
4562 error ("opaque vector types cannot be initialized");
4563 init = error_mark_node;
4567 /* If DECL has an array type without a specific bound, deduce the
4568 array size from the initializer. */
4569 maybe_deduce_size_from_array_init (decl, init);
4570 type = TREE_TYPE (decl);
4572 if (TYPE_HAS_CONSTRUCTOR (type) || TYPE_NEEDS_CONSTRUCTING (type))
4574 if (TREE_CODE (type) == ARRAY_TYPE)
4575 goto initialize_aggr;
4576 else if (TREE_CODE (init) == CONSTRUCTOR)
4578 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
4579 if (TYPE_NON_AGGREGATE_CLASS (type))
4581 error ("%qD must be initialized by constructor, "
4584 init = error_mark_node;
4587 goto dont_use_constructor;
4591 int saved_stmts_are_full_exprs_p;
4594 saved_stmts_are_full_exprs_p = 0;
4595 if (building_stmt_tree ())
4597 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
4598 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
4600 init = build_aggr_init (decl, init, flags);
4601 if (building_stmt_tree ())
4602 current_stmt_tree ()->stmts_are_full_exprs_p =
4603 saved_stmts_are_full_exprs_p;
4609 dont_use_constructor:
4610 if (TREE_CODE (init) != TREE_VEC)
4612 init_code = store_init_value (decl, init);
4613 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
4614 && DECL_INITIAL (decl)
4615 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
4616 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
4617 warning (0, "array %qD initialized by parenthesized string literal %qE",
4618 decl, DECL_INITIAL (decl));
4623 else if (DECL_EXTERNAL (decl))
4625 else if (TYPE_P (type) && TYPE_NEEDS_CONSTRUCTING (type))
4626 goto initialize_aggr;
4627 else if (IS_AGGR_TYPE (type))
4629 tree core_type = strip_array_types (type);
4631 if (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type))
4632 error ("structure %qD with uninitialized const members", decl);
4633 if (CLASSTYPE_REF_FIELDS_NEED_INIT (core_type))
4634 error ("structure %qD with uninitialized reference members", decl);
4636 check_for_uninitialized_const_var (decl);
4639 check_for_uninitialized_const_var (decl);
4641 if (init && init != error_mark_node)
4642 init_code = build2 (INIT_EXPR, type, decl, init);
4647 /* If DECL is not a local variable, give it RTL. */
4650 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
4652 int toplev = toplevel_bindings_p ();
4654 const char *filename;
4656 /* Set the DECL_ASSEMBLER_NAME for the object. */
4659 /* The `register' keyword, when used together with an
4660 asm-specification, indicates that the variable should be
4661 placed in a particular register. */
4662 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
4664 set_user_assembler_name (decl, asmspec);
4665 DECL_HARD_REGISTER (decl) = 1;
4669 if (TREE_CODE (decl) == FUNCTION_DECL
4670 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
4671 set_builtin_user_assembler_name (decl, asmspec);
4672 set_user_assembler_name (decl, asmspec);
4676 /* Handle non-variables up front. */
4677 if (TREE_CODE (decl) != VAR_DECL)
4679 rest_of_decl_compilation (decl, toplev, at_eof);
4683 /* If we see a class member here, it should be a static data
4685 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
4687 gcc_assert (TREE_STATIC (decl));
4688 /* An in-class declaration of a static data member should be
4689 external; it is only a declaration, and not a definition. */
4690 if (init == NULL_TREE)
4691 gcc_assert (DECL_EXTERNAL (decl));
4694 /* We don't create any RTL for local variables. */
4695 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
4698 /* We defer emission of local statics until the corresponding
4699 DECL_EXPR is expanded. */
4700 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
4702 /* We try to defer namespace-scope static constants so that they are
4703 not emitted into the object file unnecessarily. */
4704 filename = input_filename;
4705 if (!DECL_VIRTUAL_P (decl)
4706 && TREE_READONLY (decl)
4707 && DECL_INITIAL (decl) != NULL_TREE
4708 && DECL_INITIAL (decl) != error_mark_node
4710 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
4712 && !TREE_PUBLIC (decl))
4714 /* Fool with the linkage of static consts according to #pragma
4716 struct c_fileinfo *finfo = get_fileinfo (lbasename (filename));
4717 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
4719 TREE_PUBLIC (decl) = 1;
4720 DECL_EXTERNAL (decl) = finfo->interface_only;
4725 /* Likewise for template instantiations. */
4726 else if (DECL_LANG_SPECIFIC (decl)
4727 && DECL_IMPLICIT_INSTANTIATION (decl))
4730 /* If we're not deferring, go ahead and assemble the variable. */
4732 rest_of_decl_compilation (decl, toplev, at_eof);
4735 /* Generate code to initialize DECL (a local variable). */
4738 initialize_local_var (tree decl, tree init)
4740 tree type = TREE_TYPE (decl);
4743 gcc_assert (TREE_CODE (decl) == VAR_DECL
4744 || TREE_CODE (decl) == RESULT_DECL);
4745 gcc_assert (!TREE_STATIC (decl));
4747 if (DECL_SIZE (decl) == NULL_TREE)
4749 /* If we used it already as memory, it must stay in memory. */
4750 DECL_INITIAL (decl) = NULL_TREE;
4751 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
4754 if (DECL_SIZE (decl) && type != error_mark_node)
4758 /* Compute and store the initial value. */
4759 already_used = TREE_USED (decl) || TREE_USED (type);
4761 /* Perform the initialization. */
4764 int saved_stmts_are_full_exprs_p;
4766 gcc_assert (building_stmt_tree ());
4767 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
4768 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
4769 finish_expr_stmt (init);
4770 current_stmt_tree ()->stmts_are_full_exprs_p =
4771 saved_stmts_are_full_exprs_p;
4774 /* Set this to 0 so we can tell whether an aggregate which was
4775 initialized was ever used. Don't do this if it has a
4776 destructor, so we don't complain about the 'resource
4777 allocation is initialization' idiom. Now set
4778 attribute((unused)) on types so decls of that type will be
4779 marked used. (see TREE_USED, above.) */
4780 if (TYPE_NEEDS_CONSTRUCTING (type)
4782 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
4783 && DECL_NAME (decl))
4784 TREE_USED (decl) = 0;
4785 else if (already_used)
4786 TREE_USED (decl) = 1;
4789 /* Generate a cleanup, if necessary. */
4790 cleanup = cxx_maybe_build_cleanup (decl);
4791 if (DECL_SIZE (decl) && cleanup)
4792 finish_decl_cleanup (decl, cleanup);
4795 /* DECL is a VAR_DECL for a compiler-generated variable with static
4796 storage duration (like a virtual table) whose initializer is a
4797 compile-time constant. Initialize the variable and provide it to
4801 initialize_artificial_var (tree decl, tree init)
4803 DECL_INITIAL (decl) = build_constructor_from_list (NULL_TREE, init);
4804 DECL_INITIALIZED_P (decl) = 1;
4805 determine_visibility (decl);
4806 layout_var_decl (decl);
4807 maybe_commonize_var (decl);
4808 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
4811 /* Finish processing of a declaration;
4812 install its line number and initial value.
4813 If the length of an array type is not known before,
4814 it must be determined now, from the initial value, or it is an error.
4816 INIT holds the value of an initializer that should be allowed to escape
4819 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
4820 if the (init) syntax was used. */
4823 cp_finish_decl (tree decl, tree init, tree asmspec_tree, int flags)
4827 const char *asmspec = NULL;
4828 int was_readonly = 0;
4829 bool var_definition_p = false;
4831 if (decl == error_mark_node)
4836 error ("assignment (not initialization) in declaration");
4840 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
4842 /* Assume no cleanup is required. */
4843 cleanup = NULL_TREE;
4845 /* If a name was specified, get the string. */
4846 if (global_scope_p (current_binding_level))
4847 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
4849 asmspec = TREE_STRING_POINTER (asmspec_tree);
4851 if (init && TREE_CODE (init) == NAMESPACE_DECL)
4853 error ("cannot initialize %qD to namespace %qD", decl, init);
4857 if (current_class_type
4858 && CP_DECL_CONTEXT (decl) == current_class_type
4859 && TYPE_BEING_DEFINED (current_class_type)
4860 && (DECL_INITIAL (decl) || init))
4861 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
4863 type = TREE_TYPE (decl);
4865 if (type == error_mark_node)
4868 if (processing_template_decl)
4870 /* Add this declaration to the statement-tree. */
4871 if (at_function_scope_p ())
4872 add_decl_expr (decl);
4874 if (init && DECL_INITIAL (decl))
4875 DECL_INITIAL (decl) = init;
4876 if (TREE_CODE (decl) == VAR_DECL
4877 && !DECL_PRETTY_FUNCTION_P (decl)
4878 && !dependent_type_p (TREE_TYPE (decl)))
4879 maybe_deduce_size_from_array_init (decl, init);
4884 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
4885 gcc_assert (TREE_CODE (decl) != PARM_DECL);
4887 /* Take care of TYPE_DECLs up front. */
4888 if (TREE_CODE (decl) == TYPE_DECL)
4890 if (type != error_mark_node
4891 && IS_AGGR_TYPE (type) && DECL_NAME (decl))
4893 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
4894 warning (0, "shadowing previous type declaration of %q#D", decl);
4895 set_identifier_type_value (DECL_NAME (decl), decl);
4898 /* If we have installed this as the canonical typedef for this
4899 type, and that type has not been defined yet, delay emitting
4900 the debug information for it, as we will emit it later. */
4901 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
4902 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
4903 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
4905 rest_of_decl_compilation (decl, DECL_CONTEXT (decl) == NULL_TREE,
4910 /* A reference will be modified here, as it is initialized. */
4911 if (! DECL_EXTERNAL (decl)
4912 && TREE_READONLY (decl)
4913 && TREE_CODE (type) == REFERENCE_TYPE)
4916 TREE_READONLY (decl) = 0;
4919 if (TREE_CODE (decl) == VAR_DECL)
4921 /* Only PODs can have thread-local storage. Other types may require
4922 various kinds of non-trivial initialization. */
4923 if (DECL_THREAD_LOCAL_P (decl) && !pod_type_p (TREE_TYPE (decl)))
4924 error ("%qD cannot be thread-local because it has non-POD type %qT",
4925 decl, TREE_TYPE (decl));
4926 /* Convert the initializer to the type of DECL, if we have not
4927 already initialized DECL. */
4928 if (!DECL_INITIALIZED_P (decl)
4929 /* If !DECL_EXTERNAL then DECL is being defined. In the
4930 case of a static data member initialized inside the
4931 class-specifier, there can be an initializer even if DECL
4932 is *not* defined. */
4933 && (!DECL_EXTERNAL (decl) || init))
4935 init = check_initializer (decl, init, flags, &cleanup);
4936 /* Thread-local storage cannot be dynamically initialized. */
4937 if (DECL_THREAD_LOCAL_P (decl) && init)
4939 error ("%qD is thread-local and so cannot be dynamically "
4940 "initialized", decl);
4944 /* Check that the initializer for a static data member was a
4945 constant. Although we check in the parser that the
4946 initializer is an integral constant expression, we do not
4947 simplify division-by-zero at the point at which it
4948 occurs. Therefore, in:
4950 struct S { static const int i = 7 / 0; };
4952 we issue an error at this point. It would
4953 probably be better to forbid division by zero in
4954 integral constant expressions. */
4955 if (DECL_EXTERNAL (decl) && init)
4957 error ("%qD cannot be initialized by a non-constant expression"
4958 " when being declared", decl);
4959 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
4967 The memory occupied by any object of static storage
4968 duration is zero-initialized at program startup before
4969 any other initialization takes place.
4971 We cannot create an appropriate initializer until after
4972 the type of DECL is finalized. If DECL_INITIAL is set,
4973 then the DECL is statically initialized, and any
4974 necessary zero-initialization has already been performed. */
4975 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
4976 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
4977 /*nelts=*/NULL_TREE,
4978 /*static_storage_p=*/true);
4979 /* Remember that the initialization for this variable has
4981 DECL_INITIALIZED_P (decl) = 1;
4982 /* This declaration is the definition of this variable,
4983 unless we are initializing a static data member within
4984 the class specifier. */
4985 if (!DECL_EXTERNAL (decl))
4986 var_definition_p = true;
4987 /* The variable is being defined, so determine its
4989 determine_visibility (decl);
4991 /* If the variable has an array type, lay out the type, even if
4992 there is no initializer. It is valid to index through the
4993 array, and we must get TYPE_ALIGN set correctly on the array
4995 else if (TREE_CODE (type) == ARRAY_TYPE)
4999 /* Add this declaration to the statement-tree. This needs to happen
5000 after the call to check_initializer so that the DECL_EXPR for a
5001 reference temp is added before the DECL_EXPR for the reference itself. */
5002 if (at_function_scope_p ())
5003 add_decl_expr (decl);
5005 if (TREE_CODE (decl) == VAR_DECL)
5006 layout_var_decl (decl);
5008 /* Output the assembler code and/or RTL code for variables and functions,
5009 unless the type is an undefined structure or union.
5010 If not, it will get done when the type is completed. */
5011 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
5013 if (TREE_CODE (decl) == VAR_DECL)
5014 maybe_commonize_var (decl);
5016 make_rtl_for_nonlocal_decl (decl, init, asmspec);
5018 /* Check for abstractness of the type. Notice that there is no
5019 need to strip array types here since the check for those types
5020 is already done within create_array_type_for_decl. */
5021 if (TREE_CODE (type) == FUNCTION_TYPE
5022 || TREE_CODE (type) == METHOD_TYPE)
5023 abstract_virtuals_error (decl, TREE_TYPE (type));
5025 abstract_virtuals_error (decl, type);
5027 if (TREE_CODE (decl) == FUNCTION_DECL
5028 || TREE_TYPE (decl) == error_mark_node)
5029 /* No initialization required. */
5031 else if (DECL_EXTERNAL (decl)
5032 && ! (DECL_LANG_SPECIFIC (decl)
5033 && DECL_NOT_REALLY_EXTERN (decl)))
5036 DECL_INITIAL (decl) = init;
5040 /* A variable definition. */
5041 if (DECL_FUNCTION_SCOPE_P (decl))
5043 /* Initialize the local variable. */
5044 if (processing_template_decl)
5046 if (init || DECL_INITIAL (decl) == error_mark_node)
5047 DECL_INITIAL (decl) = init;
5049 else if (!TREE_STATIC (decl))
5050 initialize_local_var (decl, init);
5053 /* If a variable is defined, and then a subsequent
5054 definition with external linkage is encountered, we will
5055 get here twice for the same variable. We want to avoid
5056 calling expand_static_init more than once. For variables
5057 that are not static data members, we can call
5058 expand_static_init only when we actually process the
5059 initializer. It is not legal to redeclare a static data
5060 member, so this issue does not arise in that case. */
5061 if (var_definition_p && TREE_STATIC (decl))
5062 expand_static_init (decl, init);
5066 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
5067 reference, insert it in the statement-tree now. */
5069 push_cleanup (decl, cleanup, false);
5074 TREE_READONLY (decl) = 1;
5076 /* If this was marked 'used', be sure it will be output. */
5077 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
5078 mark_decl_referenced (decl);
5081 /* This is here for a midend callback from c-common.c. */
5084 finish_decl (tree decl, tree init, tree asmspec_tree)
5086 cp_finish_decl (decl, init, asmspec_tree, 0);
5089 /* Returns a declaration for a VAR_DECL as if:
5091 extern "C" TYPE NAME;
5093 had been seen. Used to create compiler-generated global
5097 declare_global_var (tree name, tree type)
5101 push_to_top_level ();
5102 decl = build_decl (VAR_DECL, name, type);
5103 TREE_PUBLIC (decl) = 1;
5104 DECL_EXTERNAL (decl) = 1;
5105 DECL_ARTIFICIAL (decl) = 1;
5106 /* If the user has explicitly declared this variable (perhaps
5107 because the code we are compiling is part of a low-level runtime
5108 library), then it is possible that our declaration will be merged
5109 with theirs by pushdecl. */
5110 decl = pushdecl (decl);
5111 cp_finish_decl (decl, NULL_TREE, NULL_TREE, 0);
5112 pop_from_top_level ();
5117 /* Returns a pointer to the `atexit' function. Note that if
5118 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
5119 `__cxa_atexit' function specified in the IA64 C++ ABI. */
5122 get_atexit_node (void)
5129 bool use_aeabi_atexit;
5134 if (flag_use_cxa_atexit)
5136 /* The declaration for `__cxa_atexit' is:
5138 int __cxa_atexit (void (*)(void *), void *, void *)
5140 We build up the argument types and then then function type
5143 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
5144 /* First, build the pointer-to-function type for the first
5146 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
5147 fn_type = build_function_type (void_type_node, arg_types);
5148 fn_ptr_type = build_pointer_type (fn_type);
5149 /* Then, build the rest of the argument types. */
5150 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
5151 if (use_aeabi_atexit)
5153 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
5154 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
5158 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
5159 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
5161 /* And the final __cxa_atexit type. */
5162 fn_type = build_function_type (integer_type_node, arg_types);
5163 fn_ptr_type = build_pointer_type (fn_type);
5164 if (use_aeabi_atexit)
5165 name = "__aeabi_atexit";
5167 name = "__cxa_atexit";
5171 /* The declaration for `atexit' is:
5173 int atexit (void (*)());
5175 We build up the argument types and then then function type
5177 fn_type = build_function_type (void_type_node, void_list_node);
5178 fn_ptr_type = build_pointer_type (fn_type);
5179 arg_types = tree_cons (NULL_TREE, fn_ptr_type, void_list_node);
5180 /* Build the final atexit type. */
5181 fn_type = build_function_type (integer_type_node, arg_types);
5185 /* Now, build the function declaration. */
5186 push_lang_context (lang_name_c);
5187 atexit_fndecl = build_library_fn_ptr (name, fn_type);
5188 mark_used (atexit_fndecl);
5189 pop_lang_context ();
5190 atexit_node = decay_conversion (atexit_fndecl);
5195 /* Returns the __dso_handle VAR_DECL. */
5198 get_dso_handle_node (void)
5200 if (dso_handle_node)
5201 return dso_handle_node;
5203 /* Declare the variable. */
5204 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
5207 return dso_handle_node;
5210 /* Begin a new function with internal linkage whose job will be simply
5211 to destroy some particular variable. */
5213 static GTY(()) int start_cleanup_cnt;
5216 start_cleanup_fn (void)
5223 push_to_top_level ();
5225 /* No need to mangle this. */
5226 push_lang_context (lang_name_c);
5228 /* Build the parameter-types. */
5229 parmtypes = void_list_node;
5230 /* Functions passed to __cxa_atexit take an additional parameter.
5231 We'll just ignore it. After we implement the new calling
5232 convention for destructors, we can eliminate the use of
5233 additional cleanup functions entirely in the -fnew-abi case. */
5234 if (flag_use_cxa_atexit)
5235 parmtypes = tree_cons (NULL_TREE, ptr_type_node, parmtypes);
5236 /* Build the function type itself. */
5237 fntype = build_function_type (void_type_node, parmtypes);
5238 /* Build the name of the function. */
5239 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
5240 /* Build the function declaration. */
5241 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
5242 /* It's a function with internal linkage, generated by the
5244 TREE_PUBLIC (fndecl) = 0;
5245 DECL_ARTIFICIAL (fndecl) = 1;
5246 /* Make the function `inline' so that it is only emitted if it is
5247 actually needed. It is unlikely that it will be inlined, since
5248 it is only called via a function pointer, but we avoid unnecessary
5249 emissions this way. */
5250 DECL_INLINE (fndecl) = 1;
5251 DECL_DECLARED_INLINE_P (fndecl) = 1;
5252 DECL_INTERFACE_KNOWN (fndecl) = 1;
5253 /* Build the parameter. */
5254 if (flag_use_cxa_atexit)
5258 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
5259 DECL_CONTEXT (parmdecl) = fndecl;
5260 TREE_USED (parmdecl) = 1;
5261 DECL_ARGUMENTS (fndecl) = parmdecl;
5265 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
5267 pop_lang_context ();
5269 return current_function_decl;
5272 /* Finish the cleanup function begun by start_cleanup_fn. */
5275 end_cleanup_fn (void)
5277 expand_or_defer_fn (finish_function (0));
5279 pop_from_top_level ();
5282 /* Generate code to handle the destruction of DECL, an object with
5283 static storage duration. */
5286 register_dtor_fn (tree decl)
5293 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
5294 return void_zero_node;
5296 /* Call build_cleanup before we enter the anonymous function so that
5297 any access checks will be done relative to the current scope,
5298 rather than the scope of the anonymous function. */
5299 build_cleanup (decl);
5301 /* Now start the function. */
5302 cleanup = start_cleanup_fn ();
5304 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
5305 to the original function, rather than the anonymous one. That
5306 will make the back-end think that nested functions are in use,
5307 which causes confusion. */
5309 push_deferring_access_checks (dk_no_check);
5310 fcall = build_cleanup (decl);
5311 pop_deferring_access_checks ();
5313 /* Create the body of the anonymous function. */
5314 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
5315 finish_expr_stmt (fcall);
5316 finish_compound_stmt (compound_stmt);
5319 /* Call atexit with the cleanup function. */
5320 cxx_mark_addressable (cleanup);
5321 mark_used (cleanup);
5322 cleanup = build_unary_op (ADDR_EXPR, cleanup, 0);
5323 if (flag_use_cxa_atexit)
5325 args = tree_cons (NULL_TREE,
5326 build_unary_op (ADDR_EXPR, get_dso_handle_node (), 0),
5328 if (targetm.cxx.use_aeabi_atexit ())
5330 args = tree_cons (NULL_TREE, cleanup, args);
5331 args = tree_cons (NULL_TREE, null_pointer_node, args);
5335 args = tree_cons (NULL_TREE, null_pointer_node, args);
5336 args = tree_cons (NULL_TREE, cleanup, args);
5340 args = tree_cons (NULL_TREE, cleanup, NULL_TREE);
5341 return build_function_call (get_atexit_node (), args);
5344 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
5345 is its initializer. Generate code to handle the construction
5346 and destruction of DECL. */
5349 expand_static_init (tree decl, tree init)
5351 gcc_assert (TREE_CODE (decl) == VAR_DECL);
5352 gcc_assert (TREE_STATIC (decl));
5354 /* Some variables require no initialization. */
5356 && !TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))
5357 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
5360 if (DECL_FUNCTION_SCOPE_P (decl))
5362 /* Emit code to perform this initialization but once. */
5363 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
5364 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
5365 tree guard, guard_addr, guard_addr_list;
5366 tree acquire_fn, release_fn, abort_fn;
5369 /* Emit code to perform this initialization but once. This code
5372 static <type> guard;
5373 if (!guard.first_byte) {
5374 if (__cxa_guard_acquire (&guard)) {
5377 // Do initialization.
5378 flag = true; __cxa_guard_release (&guard);
5379 // Register variable for destruction at end of program.
5381 if (!flag) __cxa_guard_abort (&guard);
5385 Note that the `flag' variable is only set to 1 *after* the
5386 initialization is complete. This ensures that an exception,
5387 thrown during the construction, will cause the variable to
5388 reinitialized when we pass through this code again, as per:
5392 If the initialization exits by throwing an exception, the
5393 initialization is not complete, so it will be tried again
5394 the next time control enters the declaration.
5396 This process should be thread-safe, too; multiple threads
5397 should not be able to initialize the variable more than
5400 /* Create the guard variable. */
5401 guard = get_guard (decl);
5403 /* This optimization isn't safe on targets with relaxed memory
5404 consistency. On such targets we force synchronization in
5405 __cxa_guard_acquire. */
5406 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
5408 /* Begin the conditional initialization. */
5409 if_stmt = begin_if_stmt ();
5410 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
5411 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
5414 if (flag_threadsafe_statics)
5416 guard_addr = build_address (guard);
5417 guard_addr_list = build_tree_list (NULL_TREE, guard_addr);
5419 acquire_fn = get_identifier ("__cxa_guard_acquire");
5420 release_fn = get_identifier ("__cxa_guard_release");
5421 abort_fn = get_identifier ("__cxa_guard_abort");
5422 if (!get_global_value_if_present (acquire_fn, &acquire_fn))
5424 tree argtypes = tree_cons (NULL_TREE, TREE_TYPE (guard_addr),
5426 tree vfntype = build_function_type (void_type_node, argtypes);
5427 acquire_fn = push_library_fn
5428 (acquire_fn, build_function_type (integer_type_node, argtypes));
5429 release_fn = push_library_fn (release_fn, vfntype);
5430 abort_fn = push_library_fn (abort_fn, vfntype);
5434 release_fn = identifier_global_value (release_fn);
5435 abort_fn = identifier_global_value (abort_fn);
5438 inner_if_stmt = begin_if_stmt ();
5439 finish_if_stmt_cond (build_call (acquire_fn, guard_addr_list),
5442 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
5443 begin = get_target_expr (boolean_false_node);
5444 flag = TARGET_EXPR_SLOT (begin);
5446 TARGET_EXPR_CLEANUP (begin)
5447 = build3 (COND_EXPR, void_type_node, flag,
5449 build_call (abort_fn, guard_addr_list));
5450 CLEANUP_EH_ONLY (begin) = 1;
5452 /* Do the initialization itself. */
5453 init = add_stmt_to_compound (begin, init);
5454 init = add_stmt_to_compound
5455 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
5456 init = add_stmt_to_compound
5457 (init, build_call (release_fn, guard_addr_list));
5460 init = add_stmt_to_compound (init, set_guard (guard));
5462 /* Use atexit to register a function for destroying this static
5464 init = add_stmt_to_compound (init, register_dtor_fn (decl));
5466 finish_expr_stmt (init);
5468 if (flag_threadsafe_statics)
5470 finish_compound_stmt (inner_then_clause);
5471 finish_then_clause (inner_if_stmt);
5472 finish_if_stmt (inner_if_stmt);
5475 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
5477 finish_compound_stmt (then_clause);
5478 finish_then_clause (if_stmt);
5479 finish_if_stmt (if_stmt);
5483 static_aggregates = tree_cons (init, decl, static_aggregates);
5487 /* Make TYPE a complete type based on INITIAL_VALUE.
5488 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
5489 2 if there was no information (in which case assume 0 if DO_DEFAULT),
5490 3 if the initializer list is empty (in pedantic mode). */
5493 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
5496 tree type, elt_type;
5500 /* An array of character type can be initialized from a
5501 brace-enclosed string constant.
5503 FIXME: this code is duplicated from reshape_init. Probably
5504 we should just call reshape_init here? */
5505 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
5506 && TREE_CODE (initial_value) == CONSTRUCTOR
5507 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
5509 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
5510 tree value = VEC_index (constructor_elt, v, 0)->value;
5512 if (TREE_CODE (value) == STRING_CST
5513 && VEC_length (constructor_elt, v) == 1)
5514 initial_value = value;
5518 failure = complete_array_type (ptype, initial_value, do_default);
5520 /* We can create the array before the element type is complete, which
5521 means that we didn't have these two bits set in the original type
5522 either. In completing the type, we are expected to propagate these
5523 bits. See also complete_type which does the same thing for arrays
5526 if (TYPE_DOMAIN (type))
5528 elt_type = TREE_TYPE (type);
5529 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
5530 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
5531 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
5537 /* Return zero if something is declared to be a member of type
5538 CTYPE when in the context of CUR_TYPE. STRING is the error
5539 message to print in that case. Otherwise, quietly return 1. */
5542 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
5544 if (ctype && ctype != cur_type)
5546 if (flags == DTOR_FLAG)
5547 error ("destructor for alien class %qT cannot be a member", ctype);
5549 error ("constructor for alien class %qT cannot be a member", ctype);
5555 /* Subroutine of `grokdeclarator'. */
5557 /* Generate errors possibly applicable for a given set of specifiers.
5558 This is for ARM $7.1.2. */
5561 bad_specifiers (tree object,
5570 error ("%qD declared as a %<virtual%> %s", object, type);
5572 error ("%qD declared as an %<inline%> %s", object, type);
5574 error ("%<const%> and %<volatile%> function specifiers on "
5575 "%qD invalid in %s declaration",
5578 error ("%q+D declared as a friend", object);
5580 && (TREE_CODE (object) == TYPE_DECL
5581 || (!TYPE_PTRFN_P (TREE_TYPE (object))
5582 && !TYPE_REFFN_P (TREE_TYPE (object))
5583 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
5584 error ("%q+D declared with an exception specification", object);
5587 /* DECL is a member function or static data member and is presently
5588 being defined. Check that the definition is taking place in a
5592 check_class_member_definition_namespace (tree decl)
5594 /* These checks only apply to member functions and static data
5596 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
5597 || TREE_CODE (decl) == VAR_DECL);
5598 /* We check for problems with specializations in pt.c in
5599 check_specialization_namespace, where we can issue better
5601 if (processing_specialization)
5603 /* There are no restrictions on the placement of
5604 explicit instantiations. */
5605 if (processing_explicit_instantiation)
5609 A member function definition that appears outside of the
5610 class definition shall appear in a namespace scope enclosing
5611 the class definition.
5615 The definition for a static data member shall appear in a
5616 namespace scope enclosing the member's class definition. */
5617 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
5618 pedwarn ("definition of %qD is not in namespace enclosing %qT",
5619 decl, DECL_CONTEXT (decl));
5622 /* CTYPE is class type, or null if non-class.
5623 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
5625 DECLARATOR is the function's name.
5626 PARMS is a chain of PARM_DECLs for the function.
5627 VIRTUALP is truthvalue of whether the function is virtual or not.
5628 FLAGS are to be passed through to `grokclassfn'.
5629 QUALS are qualifiers indicating whether the function is `const'
5631 RAISES is a list of exceptions that this function can raise.
5632 CHECK is 1 if we must find this method in CTYPE, 0 if we should
5633 not look, and -1 if we should not call `grokclassfn' at all.
5635 SFK is the kind of special function (if any) for the new function.
5637 Returns `NULL_TREE' if something goes wrong, after issuing
5638 applicable error messages. */
5641 grokfndecl (tree ctype,
5645 tree orig_declarator,
5647 enum overload_flags flags,
5654 special_function_kind sfk,
5661 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
5662 int has_default_arg = 0;
5666 type = build_exception_variant (type, raises);
5668 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
5669 DECL_ARGUMENTS (decl) = parms;
5670 /* Propagate volatile out from type to decl. */
5671 if (TYPE_VOLATILE (type))
5672 TREE_THIS_VOLATILE (decl) = 1;
5674 /* If this decl has namespace scope, set that up. */
5676 set_decl_namespace (decl, in_namespace, friendp);
5678 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
5680 /* `main' and builtins have implicit 'C' linkage. */
5681 if ((MAIN_NAME_P (declarator)
5682 || (IDENTIFIER_LENGTH (declarator) > 10
5683 && IDENTIFIER_POINTER (declarator)[0] == '_'
5684 && IDENTIFIER_POINTER (declarator)[1] == '_'
5685 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
5686 && current_lang_name == lang_name_cplusplus
5687 && ctype == NULL_TREE
5688 /* NULL_TREE means global namespace. */
5689 && DECL_CONTEXT (decl) == NULL_TREE)
5690 SET_DECL_LANGUAGE (decl, lang_c);
5692 /* Should probably propagate const out from type to decl I bet (mrs). */
5695 DECL_STATIC_FUNCTION_P (decl) = 1;
5696 DECL_CONTEXT (decl) = ctype;
5701 DECL_CONTEXT (decl) = ctype;
5703 check_class_member_definition_namespace (decl);
5706 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
5708 if (processing_template_decl)
5709 error ("cannot declare %<::main%> to be a template");
5711 error ("cannot declare %<::main%> to be inline");
5713 error ("cannot declare %<::main%> to be static");
5714 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
5717 error ("%<::main%> must return %<int%>");
5718 TREE_TYPE (TREE_TYPE (decl)) = integer_type_node;
5724 /* Members of anonymous types and local classes have no linkage; make
5725 them internal. If a typedef is made later, this will be changed. */
5726 if (ctype && (TYPE_ANONYMOUS_P (ctype)
5727 || decl_function_context (TYPE_MAIN_DECL (ctype))))
5732 /* [basic.link]: A name with no linkage (notably, the name of a class
5733 or enumeration declared in a local scope) shall not be used to
5734 declare an entity with linkage.
5736 Only check this for public decls for now. See core 319, 389. */
5737 t = no_linkage_check (TREE_TYPE (decl),
5738 /*relaxed_p=*/false);
5741 if (TYPE_ANONYMOUS_P (t))
5743 if (DECL_EXTERN_C_P (decl))
5744 /* Allow this; it's pretty common in C. */;
5747 pedwarn ("non-local function %q#D uses anonymous type",
5749 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
5750 pedwarn ("%q+#D does not refer to the unqualified "
5751 "type, so it is not used for linkage",
5756 pedwarn ("non-local function %q#D uses local type %qT", decl, t);
5760 TREE_PUBLIC (decl) = publicp;
5763 DECL_INTERFACE_KNOWN (decl) = 1;
5764 DECL_NOT_REALLY_EXTERN (decl) = 1;
5767 /* If the declaration was declared inline, mark it as such. */
5769 DECL_DECLARED_INLINE_P (decl) = 1;
5770 /* We inline functions that are explicitly declared inline, or, when
5771 the user explicitly asks us to, all functions. */
5772 if (DECL_DECLARED_INLINE_P (decl)
5773 || (flag_inline_trees == 2 && !DECL_INLINE (decl) && funcdef_flag))
5774 DECL_INLINE (decl) = 1;
5776 DECL_EXTERNAL (decl) = 1;
5777 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
5779 error ("%smember function %qD cannot have cv-qualifier",
5780 (ctype ? "static " : "non-"), decl);
5781 quals = TYPE_UNQUALIFIED;
5784 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl)))
5785 grok_op_properties (decl, /*complain=*/true);
5787 if (ctype && decl_function_context (decl))
5788 DECL_NO_STATIC_CHAIN (decl) = 1;
5790 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
5791 if (TREE_PURPOSE (t)
5792 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
5794 has_default_arg = 1;
5799 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
5803 ("defining explicit specialization %qD in friend declaration",
5807 tree fns = TREE_OPERAND (orig_declarator, 0);
5808 tree args = TREE_OPERAND (orig_declarator, 1);
5810 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
5812 /* Something like `template <class T> friend void f<T>()'. */
5813 error ("invalid use of template-id %qD in declaration "
5814 "of primary template",
5820 /* A friend declaration of the form friend void f<>(). Record
5821 the information in the TEMPLATE_ID_EXPR. */
5822 SET_DECL_IMPLICIT_INSTANTIATION (decl);
5824 if (TREE_CODE (fns) == COMPONENT_REF)
5826 /* Due to bison parser ickiness, we will have already looked
5827 up an operator_name or PFUNCNAME within the current class
5828 (see template_id in parse.y). If the current class contains
5829 such a name, we'll get a COMPONENT_REF here. Undo that. */
5831 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
5832 == current_class_type);
5833 fns = TREE_OPERAND (fns, 1);
5835 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
5836 || TREE_CODE (fns) == OVERLOAD);
5837 DECL_TEMPLATE_INFO (decl) = tree_cons (fns, args, NULL_TREE);
5839 if (has_default_arg)
5841 error ("default arguments are not allowed in declaration "
5842 "of friend template specialization %qD",
5849 error ("%<inline%> is not allowed in declaration of friend "
5850 "template specialization %qD",
5858 /* Make the init_value nonzero so pushdecl knows this is not
5859 tentative. error_mark_node is replaced later with the BLOCK. */
5860 DECL_INITIAL (decl) = error_mark_node;
5862 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
5863 TREE_NOTHROW (decl) = 1;
5865 /* Caller will do the rest of this. */
5869 if (ctype != NULL_TREE)
5871 if (sfk == sfk_constructor)
5872 DECL_CONSTRUCTOR_P (decl) = 1;
5874 grokclassfn (ctype, decl, flags, quals);
5877 decl = check_explicit_specialization (orig_declarator, decl,
5879 2 * (funcdef_flag != 0) +
5880 4 * (friendp != 0));
5881 if (decl == error_mark_node)
5886 cplus_decl_attributes (&decl, *attrlist, 0);
5887 *attrlist = NULL_TREE;
5890 if (ctype != NULL_TREE
5891 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
5896 old_decl = check_classfn (ctype, decl,
5897 (processing_template_decl
5898 > template_class_depth (ctype))
5899 ? current_template_parms
5902 if (old_decl && TREE_CODE (old_decl) == TEMPLATE_DECL)
5903 /* Because grokfndecl is always supposed to return a
5904 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
5905 here. We depend on our callers to figure out that its
5906 really a template that's being returned. */
5907 old_decl = DECL_TEMPLATE_RESULT (old_decl);
5909 if (old_decl && DECL_STATIC_FUNCTION_P (old_decl)
5910 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
5911 /* Remove the `this' parm added by grokclassfn.
5912 XXX Isn't this done in start_function, too? */
5913 revert_static_member_fn (decl);
5914 if (old_decl && DECL_ARTIFICIAL (old_decl))
5915 error ("definition of implicitly-declared %qD", old_decl);
5922 /* Since we've smashed OLD_DECL to its
5923 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
5924 if (TREE_CODE (decl) == TEMPLATE_DECL)
5925 decl = DECL_TEMPLATE_RESULT (decl);
5927 /* Attempt to merge the declarations. This can fail, in
5928 the case of some invalid specialization declarations. */
5929 pushed_scope = push_scope (ctype);
5930 ok = duplicate_decls (decl, old_decl, friendp);
5932 pop_scope (pushed_scope);
5935 error ("no %q#D member function declared in class %qT",
5943 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
5946 if (ctype == NULL_TREE || check)
5950 DECL_VIRTUAL_P (decl) = 1;
5955 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
5956 the linkage that DECL will receive in the object file. */
5959 set_linkage_for_static_data_member (tree decl)
5961 /* A static data member always has static storage duration and
5962 external linkage. Note that static data members are forbidden in
5963 local classes -- the only situation in which a class has
5964 non-external linkage. */
5965 TREE_PUBLIC (decl) = 1;
5966 TREE_STATIC (decl) = 1;
5967 /* For non-template classes, static data members are always put
5968 out in exactly those files where they are defined, just as
5969 with ordinary namespace-scope variables. */
5970 if (!processing_template_decl)
5971 DECL_INTERFACE_KNOWN (decl) = 1;
5974 /* Create a VAR_DECL named NAME with the indicated TYPE.
5976 If SCOPE is non-NULL, it is the class type or namespace containing
5977 the variable. If SCOPE is NULL, the variable should is created in
5978 the innermost enclosings scope. */
5981 grokvardecl (tree type,
5983 const cp_decl_specifier_seq *declspecs,
5989 tree explicit_scope;
5991 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
5993 /* Compute the scope in which to place the variable, but remember
5994 whether or not that scope was explicitly specified by the user. */
5995 explicit_scope = scope;
5998 /* An explicit "extern" specifier indicates a namespace-scope
6000 if (declspecs->storage_class == sc_extern)
6001 scope = current_namespace;
6002 else if (!at_function_scope_p ())
6003 scope = current_scope ();
6007 && (/* If the variable is a namespace-scope variable declared in a
6008 template, we need DECL_LANG_SPECIFIC. */
6009 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
6010 /* Similarly for namespace-scope variables with language linkage
6012 || (TREE_CODE (scope) == NAMESPACE_DECL
6013 && current_lang_name != lang_name_cplusplus)
6014 /* Similarly for static data members. */
6016 decl = build_lang_decl (VAR_DECL, name, type);
6018 decl = build_decl (VAR_DECL, name, type);
6020 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
6021 set_decl_namespace (decl, explicit_scope, 0);
6023 DECL_CONTEXT (decl) = scope;
6025 if (declspecs->storage_class == sc_extern)
6027 DECL_THIS_EXTERN (decl) = 1;
6028 DECL_EXTERNAL (decl) = !initialized;
6031 if (DECL_CLASS_SCOPE_P (decl))
6033 set_linkage_for_static_data_member (decl);
6034 /* This function is only called with out-of-class definitions. */
6035 DECL_EXTERNAL (decl) = 0;
6036 check_class_member_definition_namespace (decl);
6038 /* At top level, either `static' or no s.c. makes a definition
6039 (perhaps tentative), and absence of `static' makes it public. */
6040 else if (toplevel_bindings_p ())
6042 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
6043 && (DECL_THIS_EXTERN (decl) || ! constp));
6044 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
6046 /* Not at top level, only `static' makes a static definition. */
6049 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
6050 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
6053 if (declspecs->specs[(int)ds_thread])
6055 if (targetm.have_tls)
6056 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
6058 /* A mere warning is sure to result in improper semantics
6059 at runtime. Don't bother to allow this to compile. */
6060 error ("thread-local storage not supported for this target");
6063 if (TREE_PUBLIC (decl))
6065 /* [basic.link]: A name with no linkage (notably, the name of a class
6066 or enumeration declared in a local scope) shall not be used to
6067 declare an entity with linkage.
6069 Only check this for public decls for now. */
6070 tree t = no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false);
6073 if (TYPE_ANONYMOUS_P (t))
6075 if (DECL_EXTERN_C_P (decl))
6076 /* Allow this; it's pretty common in C. */
6080 /* DRs 132, 319 and 389 seem to indicate types with
6081 no linkage can only be used to declare extern "C"
6082 entities. Since it's not always an error in the
6083 ISO C++ 90 Standard, we only issue a warning. */
6084 warning (0, "non-local variable %q#D uses anonymous type",
6086 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
6087 warning (0, "%q+#D does not refer to the unqualified "
6088 "type, so it is not used for linkage",
6093 warning (0, "non-local variable %q#D uses local type %qT", decl, t);
6097 DECL_INTERFACE_KNOWN (decl) = 1;
6102 /* Create and return a canonical pointer to member function type, for
6103 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
6106 build_ptrmemfunc_type (tree type)
6110 tree unqualified_variant = NULL_TREE;
6112 if (type == error_mark_node)
6115 /* If a canonical type already exists for this type, use it. We use
6116 this method instead of type_hash_canon, because it only does a
6117 simple equality check on the list of field members. */
6119 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
6122 /* Make sure that we always have the unqualified pointer-to-member
6124 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
6126 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
6128 t = make_aggr_type (RECORD_TYPE);
6129 xref_basetypes (t, NULL_TREE);
6131 /* Let the front-end know this is a pointer to member function... */
6132 TYPE_PTRMEMFUNC_FLAG (t) = 1;
6133 /* ... and not really an aggregate. */
6134 SET_IS_AGGR_TYPE (t, 0);
6136 field = build_decl (FIELD_DECL, pfn_identifier, type);
6139 field = build_decl (FIELD_DECL, delta_identifier, delta_type_node);
6140 TREE_CHAIN (field) = fields;
6143 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
6145 /* Zap out the name so that the back-end will give us the debugging
6146 information for this anonymous RECORD_TYPE. */
6147 TYPE_NAME (t) = NULL_TREE;
6149 /* If this is not the unqualified form of this pointer-to-member
6150 type, set the TYPE_MAIN_VARIANT for this type to be the
6151 unqualified type. Since they are actually RECORD_TYPEs that are
6152 not variants of each other, we must do this manually. */
6153 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
6155 t = build_qualified_type (t, cp_type_quals (type));
6156 TYPE_MAIN_VARIANT (t) = unqualified_variant;
6157 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
6158 TYPE_NEXT_VARIANT (unqualified_variant) = t;
6161 /* Cache this pointer-to-member type so that we can find it again
6163 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
6168 /* Create and return a pointer to data member type. */
6171 build_ptrmem_type (tree class_type, tree member_type)
6173 if (TREE_CODE (member_type) == METHOD_TYPE)
6177 arg_types = TYPE_ARG_TYPES (member_type);
6178 class_type = (cp_build_qualified_type
6180 cp_type_quals (TREE_TYPE (TREE_VALUE (arg_types)))));
6182 = build_method_type_directly (class_type,
6183 TREE_TYPE (member_type),
6184 TREE_CHAIN (arg_types));
6185 return build_ptrmemfunc_type (build_pointer_type (member_type));
6189 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
6190 return build_offset_type (class_type, member_type);
6194 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
6195 Check to see that the definition is valid. Issue appropriate error
6196 messages. Return 1 if the definition is particularly bad, or 0
6200 check_static_variable_definition (tree decl, tree type)
6202 /* Motion 10 at San Diego: If a static const integral data member is
6203 initialized with an integral constant expression, the initializer
6204 may appear either in the declaration (within the class), or in
6205 the definition, but not both. If it appears in the class, the
6206 member is a member constant. The file-scope definition is always
6208 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
6210 error ("invalid in-class initialization of static data member "
6211 "of non-integral type %qT",
6213 /* If we just return the declaration, crashes will sometimes
6214 occur. We therefore return void_type_node, as if this were a
6215 friend declaration, to cause callers to completely ignore
6216 this declaration. */
6219 else if (!CP_TYPE_CONST_P (type))
6220 error ("ISO C++ forbids in-class initialization of non-const "
6221 "static member %qD",
6223 else if (pedantic && !INTEGRAL_TYPE_P (type))
6224 pedwarn ("ISO C++ forbids initialization of member constant "
6225 "%qD of non-integral type %qT", decl, type);
6230 /* Given the SIZE (i.e., number of elements) in an array, compute an
6231 appropriate index type for the array. If non-NULL, NAME is the
6232 name of the thing being declared. */
6235 compute_array_index_type (tree name, tree size)
6237 tree type = TREE_TYPE (size);
6240 /* The array bound must be an integer type. */
6241 if (!dependent_type_p (type) && !INTEGRAL_TYPE_P (type))
6244 error ("size of array %qD has non-integral type %qT", name, type);
6246 error ("size of array has non-integral type %qT", type);
6247 size = integer_one_node;
6248 type = TREE_TYPE (size);
6251 if (abi_version_at_least (2)
6252 /* We should only handle value dependent expressions specially. */
6253 ? value_dependent_expression_p (size)
6254 /* But for abi-1, we handled all instances in templates. This
6255 effects the manglings produced. */
6256 : processing_template_decl)
6257 return build_index_type (build_min (MINUS_EXPR, sizetype,
6258 size, integer_one_node));
6260 /* The size might be the result of a cast. */
6261 STRIP_TYPE_NOPS (size);
6263 /* It might be a const variable or enumeration constant. */
6264 size = integral_constant_value (size);
6266 /* Normally, the array-bound will be a constant. */
6267 if (TREE_CODE (size) == INTEGER_CST)
6269 /* Check to see if the array bound overflowed. Make that an
6270 error, no matter how generous we're being. */
6271 int old_flag_pedantic_errors = flag_pedantic_errors;
6272 int old_pedantic = pedantic;
6273 pedantic = flag_pedantic_errors = 1;
6274 constant_expression_warning (size);
6275 pedantic = old_pedantic;
6276 flag_pedantic_errors = old_flag_pedantic_errors;
6278 /* An array must have a positive number of elements. */
6279 if (INT_CST_LT (size, integer_zero_node))
6282 error ("size of array %qD is negative", name);
6284 error ("size of array is negative");
6285 size = integer_one_node;
6287 /* As an extension we allow zero-sized arrays. We always allow
6288 them in system headers because glibc uses them. */
6289 else if (integer_zerop (size) && pedantic && !in_system_header)
6292 pedwarn ("ISO C++ forbids zero-size array %qD", name);
6294 pedwarn ("ISO C++ forbids zero-size array");
6297 else if (TREE_CONSTANT (size))
6299 /* `(int) &fn' is not a valid array bound. */
6301 error ("size of array %qD is not an integral constant-expression",
6304 error ("size of array is not an integral constant-expression");
6309 pedwarn ("ISO C++ forbids variable-size array %qD", name);
6311 pedwarn ("ISO C++ forbids variable-size array");
6314 if (processing_template_decl && !TREE_CONSTANT (size))
6315 /* A variable sized array. */
6316 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
6319 HOST_WIDE_INT saved_processing_template_decl;
6321 /* Compute the index of the largest element in the array. It is
6322 one less than the number of elements in the array. We save
6323 and restore PROCESSING_TEMPLATE_DECL so that computations in
6324 cp_build_binary_op will be appropriately folded. */
6325 saved_processing_template_decl = processing_template_decl;
6326 processing_template_decl = 0;
6327 itype = cp_build_binary_op (MINUS_EXPR,
6328 cp_convert (ssizetype, size),
6329 cp_convert (ssizetype, integer_one_node));
6330 itype = fold (itype);
6331 processing_template_decl = saved_processing_template_decl;
6333 if (!TREE_CONSTANT (itype))
6334 /* A variable sized array. */
6335 itype = variable_size (itype);
6336 /* Make sure that there was no overflow when creating to a signed
6337 index type. (For example, on a 32-bit machine, an array with
6338 size 2^32 - 1 is too big.) */
6339 else if (TREE_OVERFLOW (itype))
6341 error ("overflow in array dimension");
6342 TREE_OVERFLOW (itype) = 0;
6346 /* Create and return the appropriate index type. */
6347 return build_index_type (itype);
6350 /* Returns the scope (if any) in which the entity declared by
6351 DECLARATOR will be located. If the entity was declared with an
6352 unqualified name, NULL_TREE is returned. */
6355 get_scope_of_declarator (const cp_declarator *declarator)
6357 while (declarator && declarator->kind != cdk_id)
6358 declarator = declarator->declarator;
6360 /* If the declarator-id is a SCOPE_REF, the scope in which the
6361 declaration occurs is the first operand. */
6363 && declarator->u.id.qualifying_scope)
6364 return declarator->u.id.qualifying_scope;
6366 /* Otherwise, the declarator is not a qualified name; the entity will
6367 be declared in the current scope. */
6371 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
6372 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
6376 create_array_type_for_decl (tree name, tree type, tree size)
6378 tree itype = NULL_TREE;
6379 const char* error_msg;
6381 /* If things have already gone awry, bail now. */
6382 if (type == error_mark_node || size == error_mark_node)
6383 return error_mark_node;
6385 /* Assume that everything will go OK. */
6388 /* There are some types which cannot be array elements. */
6389 switch (TREE_CODE (type))
6392 error_msg = "array of void";
6396 error_msg = "array of functions";
6399 case REFERENCE_TYPE:
6400 error_msg = "array of references";
6404 error_msg = "array of function members";
6411 /* If something went wrong, issue an error-message and return. */
6415 error ("declaration of %qD as %s", name, error_msg);
6417 error ("creating %s", error_msg);
6419 return error_mark_node;
6424 The constant expressions that specify the bounds of the arrays
6425 can be omitted only for the first member of the sequence. */
6426 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
6429 error ("declaration of %qD as multidimensional array must "
6430 "have bounds for all dimensions except the first",
6433 error ("multidimensional array must have bounds for all "
6434 "dimensions except the first");
6436 return error_mark_node;
6439 /* Figure out the index type for the array. */
6441 itype = compute_array_index_type (name, size);
6444 T is called the array element type; this type shall not be [...] an
6445 abstract class type. */
6446 abstract_virtuals_error (name, type);
6448 return build_cplus_array_type (type, itype);
6451 /* Check that it's OK to declare a function with the indicated TYPE.
6452 SFK indicates the kind of special function (if any) that this
6453 function is. OPTYPE is the type given in a conversion operator
6454 declaration, or the class type for a constructor/destructor.
6455 Returns the actual return type of the function; that
6456 may be different than TYPE if an error occurs, or for certain
6457 special functions. */
6460 check_special_function_return_type (special_function_kind sfk,
6466 case sfk_constructor:
6468 error ("return type specification for constructor invalid");
6470 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
6471 type = build_pointer_type (optype);
6473 type = void_type_node;
6476 case sfk_destructor:
6478 error ("return type specification for destructor invalid");
6479 /* We can't use the proper return type here because we run into
6480 problems with ambiguous bases and covariant returns.
6481 Java classes are left unchanged because (void *) isn't a valid
6482 Java type, and we don't want to change the Java ABI. */
6483 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
6484 type = build_pointer_type (void_type_node);
6486 type = void_type_node;
6489 case sfk_conversion:
6490 if (type && !same_type_p (type, optype))
6491 error ("operator %qT declared to return %qT", optype, type);
6493 pedwarn ("return type specified for %<operator %T%>", optype);
6504 /* A variable or data member (whose unqualified name is IDENTIFIER)
6505 has been declared with the indicated TYPE. If the TYPE is not
6506 acceptable, issue an error message and return a type to use for
6507 error-recovery purposes. */
6510 check_var_type (tree identifier, tree type)
6512 if (VOID_TYPE_P (type))
6515 error ("unnamed variable or field declared void");
6516 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
6518 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
6519 error ("variable or field %qE declared void", identifier);
6522 error ("variable or field declared void");
6523 type = integer_type_node;
6529 /* Given declspecs and a declarator (abstract or otherwise), determine
6530 the name and type of the object declared and construct a DECL node
6533 DECLSPECS is a chain of tree_list nodes whose value fields
6534 are the storage classes and type specifiers.
6536 DECL_CONTEXT says which syntactic context this declaration is in:
6537 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
6538 FUNCDEF for a function definition. Like NORMAL but a few different
6539 error messages in each case. Return value may be zero meaning
6540 this definition is too screwy to try to parse.
6541 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
6542 handle member functions (which have FIELD context).
6543 Return value may be zero meaning this definition is too screwy to
6545 PARM for a parameter declaration (either within a function prototype
6546 or before a function body). Make a PARM_DECL, or return void_type_node.
6547 CATCHPARM for a parameter declaration before a catch clause.
6548 TYPENAME if for a typename (in a cast or sizeof).
6549 Don't make a DECL node; just return the ..._TYPE node.
6550 FIELD for a struct or union field; make a FIELD_DECL.
6551 BITFIELD for a field with specified width.
6552 INITIALIZED is 1 if the decl has an initializer.
6554 ATTRLIST is a pointer to the list of attributes, which may be NULL
6555 if there are none; *ATTRLIST may be modified if attributes from inside
6556 the declarator should be applied to the declaration.
6558 When this function is called, scoping variables (such as
6559 CURRENT_CLASS_TYPE) should reflect the scope in which the
6560 declaration occurs, not the scope in which the new declaration will
6561 be placed. For example, on:
6565 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
6566 should not be `S'. */
6569 grokdeclarator (const cp_declarator *declarator,
6570 const cp_decl_specifier_seq *declspecs,
6571 enum decl_context decl_context,
6575 tree type = NULL_TREE;
6578 int virtualp, explicitp, friendp, inlinep, staticp;
6579 int explicit_int = 0;
6580 int explicit_char = 0;
6581 int defaulted_int = 0;
6582 tree dependant_name = NULL_TREE;
6584 tree typedef_decl = NULL_TREE;
6585 const char *name = NULL;
6586 tree typedef_type = NULL_TREE;
6587 int funcdef_flag = 0;
6588 cp_declarator_kind innermost_code = cdk_error;
6591 /* See the code below that used this. */
6592 tree decl_attr = NULL_TREE;
6595 /* Keep track of what sort of function is being processed
6596 so that we can warn about default return values, or explicit
6597 return values which do not match prescribed defaults. */
6598 special_function_kind sfk = sfk_none;
6600 tree dname = NULL_TREE;
6601 tree ctor_return_type = NULL_TREE;
6602 enum overload_flags flags = NO_SPECIAL;
6603 cp_cv_quals quals = TYPE_UNQUALIFIED;
6604 tree raises = NULL_TREE;
6605 int template_count = 0;
6606 tree returned_attrs = NULL_TREE;
6607 tree parms = NULL_TREE;
6608 const cp_declarator *id_declarator;
6609 /* The unqualified name of the declarator; either an
6610 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
6611 tree unqualified_id;
6612 /* The class type, if any, in which this entity is located,
6613 or NULL_TREE if none. Note that this value may be different from
6614 the current class type; for example if an attempt is made to declare
6615 "A::f" inside "B", this value will be "A". */
6616 tree ctype = current_class_type;
6617 /* The NAMESPACE_DECL for the namespace in which this entity is
6618 located. If an unqualified name is used to declare the entity,
6619 this value will be NULL_TREE, even if the entity is located at
6621 tree in_namespace = NULL_TREE;
6623 cp_storage_class storage_class;
6624 bool unsigned_p, signed_p, short_p, long_p, thread_p;
6625 bool type_was_error_mark_node = false;
6627 signed_p = declspecs->specs[(int)ds_signed];
6628 unsigned_p = declspecs->specs[(int)ds_unsigned];
6629 short_p = declspecs->specs[(int)ds_short];
6630 long_p = declspecs->specs[(int)ds_long];
6631 thread_p = declspecs->specs[(int)ds_thread];
6633 if (decl_context == FUNCDEF)
6634 funcdef_flag = 1, decl_context = NORMAL;
6635 else if (decl_context == MEMFUNCDEF)
6636 funcdef_flag = -1, decl_context = FIELD;
6637 else if (decl_context == BITFIELD)
6638 bitfield = 1, decl_context = FIELD;
6640 /* Look inside a declarator for the name being declared
6641 and get it as a string, for an error message. */
6642 for (id_declarator = declarator;
6644 id_declarator = id_declarator->declarator)
6646 if (id_declarator->kind != cdk_id)
6647 innermost_code = id_declarator->kind;
6649 switch (id_declarator->kind)
6652 if (id_declarator->declarator
6653 && id_declarator->declarator->kind == cdk_id)
6655 sfk = id_declarator->declarator->u.id.sfk;
6656 if (sfk == sfk_destructor)
6663 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
6664 tree decl = id_declarator->u.id.unqualified_name;
6667 if (qualifying_scope)
6669 if (TYPE_P (qualifying_scope))
6671 ctype = qualifying_scope;
6672 if (innermost_code != cdk_function
6673 && current_class_type
6674 && !UNIQUELY_DERIVED_FROM_P (ctype,
6675 current_class_type))
6677 error ("type %qT is not derived from type %qT",
6678 ctype, current_class_type);
6679 return error_mark_node;
6682 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
6683 in_namespace = qualifying_scope;
6685 if (TREE_CODE (decl) == BASELINK)
6686 decl = BASELINK_FUNCTIONS (decl);
6687 if (decl == error_mark_node)
6688 return error_mark_node;
6689 switch (TREE_CODE (decl))
6695 if (innermost_code != cdk_function)
6697 error ("declaration of %qD as non-function", decl);
6698 return error_mark_node;
6700 else if (!qualifying_scope
6701 && !(current_class_type && at_class_scope_p ()))
6703 error ("declaration of %qD as non-member", decl);
6704 return error_mark_node;
6707 type = TREE_OPERAND (decl, 0);
6708 name = IDENTIFIER_POINTER (constructor_name (type));
6712 case TEMPLATE_ID_EXPR:
6714 tree fns = TREE_OPERAND (decl, 0);
6717 if (TREE_CODE (dname) == COMPONENT_REF)
6718 dname = TREE_OPERAND (dname, 1);
6719 if (TREE_CODE (dname) != IDENTIFIER_NODE)
6721 gcc_assert (is_overloaded_fn (dname));
6722 dname = DECL_NAME (get_first_fn (dname));
6727 case IDENTIFIER_NODE:
6728 if (TREE_CODE (decl) == IDENTIFIER_NODE)
6731 if (C_IS_RESERVED_WORD (dname))
6733 error ("declarator-id missing; using reserved word %qD",
6735 name = IDENTIFIER_POINTER (dname);
6737 else if (!IDENTIFIER_TYPENAME_P (dname))
6738 name = IDENTIFIER_POINTER (dname);
6741 gcc_assert (flags == NO_SPECIAL);
6742 flags = TYPENAME_FLAG;
6743 ctor_return_type = TREE_TYPE (dname);
6744 sfk = sfk_conversion;
6745 if (is_typename_at_global_scope (dname))
6746 name = IDENTIFIER_POINTER (dname);
6748 name = "<invalid operator>";
6753 dname = constructor_name (TREE_TYPE (decl));
6754 name = IDENTIFIER_POINTER (dname);
6775 if (id_declarator->kind == cdk_id)
6779 /* A function definition's declarator must have the form of
6780 a function declarator. */
6782 if (funcdef_flag && innermost_code != cdk_function)
6785 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
6786 && innermost_code != cdk_function
6787 && ! (ctype && !declspecs->any_specifiers_p))
6789 error ("declaration of %qD as non-function", dname);
6790 return error_mark_node;
6793 /* Anything declared one level down from the top level
6794 must be one of the parameters of a function
6795 (because the body is at least two levels down). */
6797 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
6798 by not allowing C++ class definitions to specify their parameters
6799 with xdecls (must be spec.d in the parmlist).
6801 Since we now wait to push a class scope until we are sure that
6802 we are in a legitimate method context, we must set oldcname
6803 explicitly (since current_class_name is not yet alive).
6805 We also want to avoid calling this a PARM if it is in a namespace. */
6807 if (decl_context == NORMAL && !toplevel_bindings_p ())
6809 struct cp_binding_level *b = current_binding_level;
6810 current_binding_level = b->level_chain;
6811 if (current_binding_level != 0 && toplevel_bindings_p ())
6812 decl_context = PARM;
6813 current_binding_level = b;
6817 name = decl_context == PARM ? "parameter" : "type name";
6819 /* If there were multiple types specified in the decl-specifier-seq,
6820 issue an error message. */
6821 if (declspecs->multiple_types_p)
6822 error ("two or more data types in declaration of %qs", name);
6823 /* Extract the basic type from the decl-specifier-seq. */
6824 type = declspecs->type;
6825 if (type == error_mark_node)
6828 type_was_error_mark_node = true;
6830 /* If the entire declaration is itself tagged as deprecated then
6831 suppress reports of deprecated items. */
6832 if (type && TREE_DEPRECATED (type)
6833 && deprecated_state != DEPRECATED_SUPPRESS)
6834 warn_deprecated_use (type);
6835 if (type && TREE_CODE (type) == TYPE_DECL)
6837 typedef_decl = type;
6838 type = TREE_TYPE (typedef_decl);
6840 /* No type at all: default to `int', and set DEFAULTED_INT
6841 because it was not a user-defined typedef. */
6842 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
6844 /* These imply 'int'. */
6845 type = integer_type_node;
6849 explicit_int = declspecs->explicit_int_p;
6850 explicit_char = declspecs->explicit_char_p;
6852 /* Check for repeated decl-specifiers. */
6853 for (ds = ds_first; ds != ds_last; ++ds)
6855 unsigned count = declspecs->specs[(int)ds];
6858 /* The "long" specifier is a special case because of
6863 error ("%<long long long%> is too long for GCC");
6864 else if (pedantic && !in_system_header && warn_long_long)
6865 pedwarn ("ISO C++ does not support %<long long%>");
6869 else if (declspecs->specs[(int)ds] > 1)
6871 static const char *const decl_spec_names[] = {
6887 error ("duplicate %qs", decl_spec_names[(int)ds]);
6892 /* See the code below that used this. */
6894 decl_attr = DECL_ATTRIBUTES (typedef_decl);
6896 typedef_type = type;
6899 if (sfk != sfk_conversion)
6900 ctor_return_type = ctype;
6902 if (sfk != sfk_none)
6903 type = check_special_function_return_type (sfk, type,
6905 else if (type == NULL_TREE)
6911 /* We handle `main' specially here, because 'main () { }' is so
6912 common. With no options, it is allowed. With -Wreturn-type,
6913 it is a warning. It is only an error with -pedantic-errors. */
6914 is_main = (funcdef_flag
6915 && dname && MAIN_NAME_P (dname)
6916 && ctype == NULL_TREE
6917 && in_namespace == NULL_TREE
6918 && current_namespace == global_namespace);
6920 if (type_was_error_mark_node)
6921 /* We've already issued an error, don't complain more. */;
6922 else if (in_system_header || flag_ms_extensions)
6923 /* Allow it, sigh. */;
6924 else if (pedantic || ! is_main)
6925 pedwarn ("ISO C++ forbids declaration of %qs with no type", name);
6926 else if (warn_return_type)
6927 warning (0, "ISO C++ forbids declaration of %qs with no type", name);
6929 type = integer_type_node;
6934 /* Now process the modifiers that were specified
6935 and check for invalid combinations. */
6937 /* Long double is a special combination. */
6938 if (long_p && TYPE_MAIN_VARIANT (type) == double_type_node)
6941 type = build_qualified_type (long_double_type_node,
6942 cp_type_quals (type));
6945 /* Check all other uses of type modifiers. */
6947 if (unsigned_p || signed_p || long_p || short_p)
6951 if (TREE_CODE (type) == REAL_TYPE)
6952 error ("short, signed or unsigned invalid for %qs", name);
6953 else if (TREE_CODE (type) != INTEGER_TYPE)
6954 error ("long, short, signed or unsigned invalid for %qs", name);
6955 else if (long_p && short_p)
6956 error ("long and short specified together for %qs", name);
6957 else if ((long_p || short_p) && explicit_char)
6958 error ("long or short specified with char for %qs", name);
6959 else if ((long_p|| short_p) && TREE_CODE (type) == REAL_TYPE)
6960 error ("long or short specified with floating type for %qs", name);
6961 else if (signed_p && unsigned_p)
6962 error ("signed and unsigned given together for %qs", name);
6966 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
6968 pedwarn ("long, short, signed or unsigned used invalidly for %qs",
6970 if (flag_pedantic_errors)
6975 /* Discard the type modifiers if they are invalid. */
6986 /* Decide whether an integer type is signed or not.
6987 Optionally treat bitfields as signed by default. */
6991 It is implementation-defined whether a plain (neither
6992 explicitly signed or unsigned) char, short, int, or long
6993 bit-field is signed or unsigned.
6995 Naturally, we extend this to long long as well. Note that
6996 this does not include wchar_t. */
6997 || (bitfield && !flag_signed_bitfields
6999 /* A typedef for plain `int' without `signed' can be
7000 controlled just like plain `int', but a typedef for
7001 `signed int' cannot be so controlled. */
7003 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
7004 && (TREE_CODE (type) == INTEGER_TYPE
7005 || TREE_CODE (type) == CHAR_TYPE)
7006 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
7009 type = long_long_unsigned_type_node;
7011 type = long_unsigned_type_node;
7013 type = short_unsigned_type_node;
7014 else if (type == char_type_node)
7015 type = unsigned_char_type_node;
7016 else if (typedef_decl)
7017 type = c_common_unsigned_type (type);
7019 type = unsigned_type_node;
7021 else if (signed_p && type == char_type_node)
7022 type = signed_char_type_node;
7024 type = long_long_integer_type_node;
7026 type = long_integer_type_node;
7028 type = short_integer_type_node;
7030 if (declspecs->specs[(int)ds_complex])
7032 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
7033 error ("complex invalid for %qs", name);
7034 /* If we just have "complex", it is equivalent to
7035 "complex double", but if any modifiers at all are specified it is
7036 the complex form of TYPE. E.g, "complex short" is
7037 "complex short int". */
7039 else if (defaulted_int && ! longlong
7040 && ! (long_p || short_p || signed_p || unsigned_p))
7041 type = complex_double_type_node;
7042 else if (type == integer_type_node)
7043 type = complex_integer_type_node;
7044 else if (type == float_type_node)
7045 type = complex_float_type_node;
7046 else if (type == double_type_node)
7047 type = complex_double_type_node;
7048 else if (type == long_double_type_node)
7049 type = complex_long_double_type_node;
7051 type = build_complex_type (type);
7054 type_quals = TYPE_UNQUALIFIED;
7055 if (declspecs->specs[(int)ds_const])
7056 type_quals |= TYPE_QUAL_CONST;
7057 if (declspecs->specs[(int)ds_volatile])
7058 type_quals |= TYPE_QUAL_VOLATILE;
7059 if (declspecs->specs[(int)ds_restrict])
7060 type_quals |= TYPE_QUAL_RESTRICT;
7061 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
7062 error ("qualifiers are not allowed on declaration of %<operator %T%>",
7065 if (TREE_CODE (type) == FUNCTION_TYPE
7066 && type_quals != TYPE_UNQUALIFIED)
7068 /* This was an error in C++98 (cv-qualifiers cannot be added to
7069 a function type), but DR 295 makes the code well-formed by
7070 dropping the extra qualifiers. */
7073 tree bad_type = build_qualified_type (type, type_quals);
7074 pedwarn ("ignoring %qV qualifiers added to function type %qT",
7077 type_quals = TYPE_UNQUALIFIED;
7079 type_quals |= cp_type_quals (type);
7080 type = cp_build_qualified_type_real
7081 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
7082 ? tf_ignore_bad_quals : 0) | tf_error | tf_warning));
7083 /* We might have ignored or rejected some of the qualifiers. */
7084 type_quals = cp_type_quals (type);
7087 inlinep = !! declspecs->specs[(int)ds_inline];
7088 virtualp = !! declspecs->specs[(int)ds_virtual];
7089 explicitp = !! declspecs->specs[(int)ds_explicit];
7091 storage_class = declspecs->storage_class;
7092 if (storage_class == sc_static)
7093 staticp = 1 + (decl_context == FIELD);
7095 if (virtualp && staticp == 2)
7097 error ("member %qD cannot be declared both virtual and static", dname);
7100 friendp = !! declspecs->specs[(int)ds_friend];
7102 if (dependant_name && !friendp)
7104 error ("%<%T::%D%> is not a valid declarator", ctype, dependant_name);
7105 return void_type_node;
7108 /* Issue errors about use of storage classes for parameters. */
7109 if (decl_context == PARM)
7111 if (declspecs->specs[(int)ds_typedef])
7112 error ("typedef declaration invalid in parameter declaration");
7113 else if (storage_class == sc_static
7114 || storage_class == sc_extern
7116 error ("storage class specifiers invalid in parameter declarations");
7119 /* Give error if `virtual' is used outside of class declaration. */
7121 && (current_class_name == NULL_TREE || decl_context != FIELD))
7123 error ("virtual outside class declaration");
7127 /* Static anonymous unions are dealt with here. */
7128 if (staticp && decl_context == TYPENAME
7130 && ANON_AGGR_TYPE_P (declspecs->type))
7131 decl_context = FIELD;
7133 /* Warn about storage classes that are invalid for certain
7134 kinds of declarations (parameters, typenames, etc.). */
7135 if (declspecs->multiple_storage_classes_p)
7137 error ("multiple storage classes in declaration of %qs", name);
7138 storage_class = sc_none;
7142 && storage_class != sc_extern
7143 && storage_class != sc_static)
7144 || declspecs->specs[(int)ds_typedef]))
7146 error ("multiple storage classes in declaration of %qs", name);
7149 else if (decl_context != NORMAL
7150 && ((storage_class != sc_none
7151 && storage_class != sc_mutable)
7154 if ((decl_context == PARM || decl_context == CATCHPARM)
7155 && (storage_class == sc_register
7156 || storage_class == sc_auto))
7158 else if (declspecs->specs[(int)ds_typedef])
7160 else if (decl_context == FIELD
7161 /* C++ allows static class elements. */
7162 && storage_class == sc_static)
7163 /* C++ also allows inlines and signed and unsigned elements,
7164 but in those cases we don't come in here. */
7168 if (decl_context == FIELD)
7169 error ("storage class specified for %qs", name);
7172 if (decl_context == PARM || decl_context == CATCHPARM)
7173 error ("storage class specified for parameter %qs", name);
7175 error ("storage class specified for typename");
7177 if (storage_class == sc_register
7178 || storage_class == sc_auto
7179 || storage_class == sc_extern
7181 storage_class = sc_none;
7184 else if (storage_class == sc_extern && initialized
7187 if (toplevel_bindings_p ())
7189 /* It's common practice (and completely valid) to have a const
7190 be initialized and declared extern. */
7191 if (!(type_quals & TYPE_QUAL_CONST))
7192 warning (0, "%qs initialized and declared %<extern%>", name);
7195 error ("%qs has both %<extern%> and initializer", name);
7197 else if (storage_class == sc_extern && funcdef_flag
7198 && ! toplevel_bindings_p ())
7199 error ("nested function %qs declared %<extern%>", name);
7200 else if (toplevel_bindings_p ())
7202 if (storage_class == sc_auto)
7203 error ("top-level declaration of %qs specifies %<auto%>", name);
7206 && storage_class != sc_extern
7207 && storage_class != sc_static)
7209 error ("function-scope %qs implicitly auto and declared %<__thread%>",
7214 if (storage_class && friendp)
7215 error ("storage class specifiers invalid in friend function declarations");
7218 unqualified_id = NULL_TREE;
7221 unqualified_id = id_declarator->u.id.unqualified_name;
7222 if (TREE_CODE (unqualified_id) == BASELINK)
7223 unqualified_id = BASELINK_FUNCTIONS (unqualified_id);
7224 switch (TREE_CODE (unqualified_id))
7228 = constructor_name (TREE_OPERAND (unqualified_id, 0));
7233 = constructor_name (TREE_TYPE (unqualified_id));
7236 case IDENTIFIER_NODE:
7237 case TEMPLATE_ID_EXPR:
7245 /* Determine the type of the entity declared by recurring on the
7247 for (; declarator; declarator = declarator->declarator)
7249 const cp_declarator *inner_declarator;
7252 if (type == error_mark_node)
7253 return error_mark_node;
7255 attrs = declarator->attributes;
7261 if (declarator == NULL || declarator->kind == cdk_id)
7262 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
7263 if (declarator->kind == cdk_function)
7264 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
7265 if (declarator->kind == cdk_array)
7266 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
7267 returned_attrs = decl_attributes (&type,
7268 chainon (returned_attrs, attrs),
7272 if (declarator->kind == cdk_id)
7275 inner_declarator = declarator->declarator;
7277 switch (declarator->kind)
7280 type = create_array_type_for_decl (dname, type,
7281 declarator->u.array.bounds);
7289 /* Declaring a function type.
7290 Make sure we have a valid type for the function to return. */
7292 /* We now know that the TYPE_QUALS don't apply to the
7293 decl, but to its return type. */
7294 type_quals = TYPE_UNQUALIFIED;
7296 /* Warn about some types functions can't return. */
7298 if (TREE_CODE (type) == FUNCTION_TYPE)
7300 error ("%qs declared as function returning a function", name);
7301 type = integer_type_node;
7303 if (TREE_CODE (type) == ARRAY_TYPE)
7305 error ("%qs declared as function returning an array", name);
7306 type = integer_type_node;
7309 /* Pick up type qualifiers which should be applied to `this'. */
7310 quals = declarator->u.function.qualifiers;
7312 /* Pick up the exception specifications. */
7313 raises = declarator->u.function.exception_specification;
7315 /* Say it's a definition only for the CALL_EXPR
7316 closest to the identifier. */
7317 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
7319 if (ctype == NULL_TREE
7320 && decl_context == FIELD
7322 && (friendp == 0 || dname == current_class_name))
7323 ctype = current_class_type;
7325 if (ctype && sfk == sfk_conversion)
7326 TYPE_HAS_CONVERSION (ctype) = 1;
7327 if (ctype && (sfk == sfk_constructor
7328 || sfk == sfk_destructor))
7330 /* We are within a class's scope. If our declarator name
7331 is the same as the class name, and we are defining
7332 a function, then it is a constructor/destructor, and
7333 therefore returns a void type. */
7335 if (flags == DTOR_FLAG)
7337 /* ISO C++ 12.4/2. A destructor may not be
7338 declared const or volatile. A destructor may
7341 error ("destructor cannot be static member function");
7344 error ("destructors may not be cv-qualified");
7345 quals = TYPE_UNQUALIFIED;
7347 if (decl_context == FIELD)
7349 if (! member_function_or_else (ctype,
7352 return void_type_node;
7355 else /* It's a constructor. */
7359 /* ISO C++ 12.1. A constructor may not be
7360 declared const or volatile. A constructor may
7361 not be virtual. A constructor may not be
7364 error ("constructor cannot be static member function");
7367 pedwarn ("constructors cannot be declared virtual");
7372 error ("constructors may not be cv-qualified");
7373 quals = TYPE_UNQUALIFIED;
7375 if (decl_context == FIELD)
7377 if (! member_function_or_else (ctype,
7380 return void_type_node;
7381 TYPE_HAS_CONSTRUCTOR (ctype) = 1;
7382 if (sfk != sfk_constructor)
7386 if (decl_context == FIELD)
7392 error ("can't initialize friend function %qs", name);
7395 /* Cannot be both friend and virtual. */
7396 error ("virtual functions cannot be friends");
7399 if (decl_context == NORMAL)
7400 error ("friend declaration not in class definition");
7401 if (current_function_decl && funcdef_flag)
7402 error ("can't define friend function %qs in a local "
7407 arg_types = grokparms (declarator->u.function.parameters,
7410 if (inner_declarator
7411 && inner_declarator->kind == cdk_id
7412 && inner_declarator->u.id.sfk == sfk_destructor
7413 && arg_types != void_list_node)
7415 error ("destructors may not have parameters");
7416 arg_types = void_list_node;
7420 type = build_function_type (type, arg_types);
7421 type = cp_build_qualified_type (type, quals);
7428 /* Filter out pointers-to-references and references-to-references.
7429 We can get these if a TYPE_DECL is used. */
7431 if (TREE_CODE (type) == REFERENCE_TYPE)
7433 error (declarator->kind == cdk_reference
7434 ? "cannot declare reference to %q#T"
7435 : "cannot declare pointer to %q#T", type);
7436 type = TREE_TYPE (type);
7438 else if (VOID_TYPE_P (type))
7440 if (declarator->kind == cdk_reference)
7441 error ("cannot declare reference to %q#T", type);
7442 else if (declarator->kind == cdk_ptrmem)
7443 error ("cannot declare pointer to %q#T member", type);
7446 /* We now know that the TYPE_QUALS don't apply to the decl,
7447 but to the target of the pointer. */
7448 type_quals = TYPE_UNQUALIFIED;
7450 if (declarator->kind == cdk_ptrmem
7451 && (TREE_CODE (type) == FUNCTION_TYPE
7452 || (quals && TREE_CODE (type) == METHOD_TYPE)))
7456 /* If the type is a FUNCTION_TYPE, pick up the
7457 qualifiers from that function type. No other
7458 qualifiers may be supplied. */
7459 if (TREE_CODE (type) == FUNCTION_TYPE)
7460 quals = cp_type_quals (type);
7462 dummy = build_decl (TYPE_DECL, NULL_TREE, type);
7463 grok_method_quals (declarator->u.pointer.class_type,
7465 type = TREE_TYPE (dummy);
7466 quals = TYPE_UNQUALIFIED;
7469 if (declarator->kind == cdk_reference)
7471 if (!VOID_TYPE_P (type))
7472 type = build_reference_type (type);
7474 else if (TREE_CODE (type) == METHOD_TYPE)
7475 type = build_ptrmemfunc_type (build_pointer_type (type));
7476 else if (declarator->kind == cdk_ptrmem)
7478 /* We might have parsed a namespace as the class type. */
7479 if (TREE_CODE (declarator->u.pointer.class_type)
7482 error ("%qD is a namespace",
7483 declarator->u.pointer.class_type);
7484 type = build_pointer_type (type);
7486 else if (declarator->u.pointer.class_type == error_mark_node)
7487 /* We will already have complained. */
7488 type = error_mark_node;
7490 type = build_ptrmem_type (declarator->u.pointer.class_type,
7494 type = build_pointer_type (type);
7496 /* Process a list of type modifier keywords (such as
7497 const or volatile) that were given inside the `*' or `&'. */
7499 if (declarator->u.pointer.qualifiers)
7502 = cp_build_qualified_type (type,
7503 declarator->u.pointer.qualifiers);
7504 type_quals = cp_type_quals (type);
7517 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
7518 && TREE_CODE (type) != FUNCTION_TYPE
7519 && TREE_CODE (type) != METHOD_TYPE)
7521 error ("template-id %qD used as a declarator",
7523 unqualified_id = dname;
7526 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
7527 qualified with a class-name, turn it into a METHOD_TYPE, unless
7528 we know that the function is static. We take advantage of this
7529 opportunity to do other processing that pertains to entities
7530 explicitly declared to be class members. Note that if DECLARATOR
7531 is non-NULL, we know it is a cdk_id declarator; otherwise, we
7532 would not have exited the loop above. */
7534 && declarator->u.id.qualifying_scope
7535 && TYPE_P (declarator->u.id.qualifying_scope))
7539 ctype = declarator->u.id.qualifying_scope;
7540 ctype = TYPE_MAIN_VARIANT (ctype);
7542 while (t != NULL_TREE && CLASS_TYPE_P (t))
7544 /* You're supposed to have one `template <...>' for every
7545 template class, but you don't need one for a full
7546 specialization. For example:
7548 template <class T> struct S{};
7549 template <> struct S<int> { void f(); };
7550 void S<int>::f () {}
7552 is correct; there shouldn't be a `template <>' for the
7553 definition of `S<int>::f'. */
7554 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
7555 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
7556 /* T is an explicit (not partial) specialization. All
7557 containing classes must therefore also be explicitly
7560 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
7561 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
7562 template_count += 1;
7564 t = TYPE_MAIN_DECL (t);
7565 t = DECL_CONTEXT (t);
7568 if (ctype == current_class_type)
7569 pedwarn ("extra qualification %<%T::%> on member %qs ignored",
7571 else if (TREE_CODE (type) == FUNCTION_TYPE)
7573 tree sname = declarator->u.id.unqualified_name;
7575 if (TREE_CODE (sname) == IDENTIFIER_NODE
7576 && NEW_DELETE_OPNAME_P (sname))
7577 /* Overloaded operator new and operator delete
7578 are always static functions. */
7580 else if (current_class_type == NULL_TREE || friendp)
7582 = build_method_type_directly (ctype,
7584 TYPE_ARG_TYPES (type));
7587 error ("cannot declare member function %<%T::%s%> within %<%T%>",
7588 ctype, name, current_class_type);
7589 return error_mark_node;
7592 else if (declspecs->specs[(int)ds_typedef]
7593 || COMPLETE_TYPE_P (complete_type (ctype)))
7595 /* Have to move this code elsewhere in this function.
7596 this code is used for i.e., typedef int A::M; M *pm;
7598 It is? How? jason 10/2/94 */
7600 if (current_class_type)
7602 error ("cannot declare member %<%T::%s%> within %qT",
7603 ctype, name, current_class_type);
7604 return void_type_node;
7609 cxx_incomplete_type_error (NULL_TREE, ctype);
7610 return error_mark_node;
7614 /* Now TYPE has the actual type. */
7619 *attrlist = chainon (returned_attrs, *attrlist);
7621 attrlist = &returned_attrs;
7624 /* Did array size calculations overflow? */
7626 if (TREE_CODE (type) == ARRAY_TYPE
7627 && COMPLETE_TYPE_P (type)
7628 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
7629 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
7631 error ("size of array %qs is too large", name);
7632 /* If we proceed with the array type as it is, we'll eventually
7633 crash in tree_low_cst(). */
7634 type = error_mark_node;
7637 if ((decl_context == FIELD || decl_context == PARM)
7638 && !processing_template_decl
7639 && variably_modified_type_p (type, NULL_TREE))
7641 if (decl_context == FIELD)
7642 error ("data member may not have variably modified type %qT", type);
7644 error ("parameter may not have variably modified type %qT", type);
7645 type = error_mark_node;
7648 if (explicitp == 1 || (explicitp && friendp))
7650 /* [dcl.fct.spec] The explicit specifier shall only be used in
7651 declarations of constructors within a class definition. */
7652 error ("only declarations of constructors can be %<explicit%>");
7656 if (storage_class == sc_mutable)
7658 if (decl_context != FIELD || friendp)
7660 error ("non-member %qs cannot be declared %<mutable%>", name);
7661 storage_class = sc_none;
7663 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
7665 error ("non-object member %qs cannot be declared %<mutable%>", name);
7666 storage_class = sc_none;
7668 else if (TREE_CODE (type) == FUNCTION_TYPE
7669 || TREE_CODE (type) == METHOD_TYPE)
7671 error ("function %qs cannot be declared %<mutable%>", name);
7672 storage_class = sc_none;
7676 error ("static %qs cannot be declared %<mutable%>", name);
7677 storage_class = sc_none;
7679 else if (type_quals & TYPE_QUAL_CONST)
7681 error ("const %qs cannot be declared %<mutable%>", name);
7682 storage_class = sc_none;
7686 /* If this is declaring a typedef name, return a TYPE_DECL. */
7687 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
7691 /* Note that the grammar rejects storage classes
7692 in typenames, fields or parameters. */
7693 if (current_lang_name == lang_name_java)
7694 TYPE_FOR_JAVA (type) = 1;
7696 if (decl_context == FIELD)
7697 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
7699 decl = build_decl (TYPE_DECL, unqualified_id, type);
7700 if (id_declarator && declarator->u.id.qualifying_scope)
7701 error ("%Jtypedef name may not be a nested-name-specifier", decl);
7703 if (decl_context != FIELD)
7705 if (!current_function_decl)
7706 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
7707 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
7708 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
7709 (current_function_decl)))
7710 /* The TYPE_DECL is "abstract" because there will be
7711 clones of this constructor/destructor, and there will
7712 be copies of this TYPE_DECL generated in those
7714 DECL_ABSTRACT (decl) = 1;
7716 else if (constructor_name_p (unqualified_id, current_class_type))
7717 pedwarn ("ISO C++ forbids nested type %qD with same name "
7718 "as enclosing class",
7721 /* If the user declares "typedef struct {...} foo" then the
7722 struct will have an anonymous name. Fill that name in now.
7723 Nothing can refer to it, so nothing needs know about the name
7725 if (type != error_mark_node
7728 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
7729 && TYPE_ANONYMOUS_P (type)
7730 /* Don't do this if there are attributes. */
7731 && (!attrlist || !*attrlist)
7732 && cp_type_quals (type) == TYPE_UNQUALIFIED)
7734 tree oldname = TYPE_NAME (type);
7737 /* Replace the anonymous name with the real name everywhere. */
7738 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
7739 if (TYPE_NAME (t) == oldname)
7740 TYPE_NAME (t) = decl;
7742 if (TYPE_LANG_SPECIFIC (type))
7743 TYPE_WAS_ANONYMOUS (type) = 1;
7745 /* If this is a typedef within a template class, the nested
7746 type is a (non-primary) template. The name for the
7747 template needs updating as well. */
7748 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
7749 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
7750 = TYPE_IDENTIFIER (type);
7752 /* FIXME remangle member functions; member functions of a
7753 type with external linkage have external linkage. */
7758 if (ctype == NULL_TREE)
7760 if (TREE_CODE (type) == METHOD_TYPE)
7761 ctype = TYPE_METHOD_BASETYPE (type);
7762 /* Any qualifiers on a function type typedef have
7763 already been dealt with. */
7764 else if (TREE_CODE (type) == FUNCTION_TYPE)
7765 quals = TYPE_UNQUALIFIED;
7767 if (ctype != NULL_TREE)
7768 grok_method_quals (ctype, decl, quals);
7772 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
7773 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
7775 bad_specifiers (decl, "type", virtualp, quals != TYPE_UNQUALIFIED,
7776 inlinep, friendp, raises != NULL_TREE);
7781 /* Detect the case of an array type of unspecified size
7782 which came, as such, direct from a typedef name.
7783 We must copy the type, so that the array's domain can be
7784 individually set by the object's initializer. */
7786 if (type && typedef_type
7787 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
7788 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
7789 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
7791 /* Detect where we're using a typedef of function type to declare a
7792 function. PARMS will not be set, so we must create it now. */
7794 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
7796 tree decls = NULL_TREE;
7799 for (args = TYPE_ARG_TYPES (type); args; args = TREE_CHAIN (args))
7801 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
7803 TREE_CHAIN (decl) = decls;
7807 parms = nreverse (decls);
7809 if (decl_context != TYPENAME)
7811 /* A cv-qualifier-seq shall only be part of the function type
7812 for a non-static member function. [8.3.5/4 dcl.fct] */
7813 if (cp_type_quals (type) != TYPE_UNQUALIFIED
7814 && (current_class_type == NULL_TREE || staticp) )
7816 error ("qualified function types cannot be used to declare %s functions",
7817 (staticp? "static member" : "free"));
7818 type = TYPE_MAIN_VARIANT (type);
7821 /* The qualifiers on the function type become the qualifiers on
7822 the non-static member function. */
7823 quals |= cp_type_quals (type);
7827 /* If this is a type name (such as, in a cast or sizeof),
7828 compute the type and return it now. */
7830 if (decl_context == TYPENAME)
7832 /* Note that the grammar rejects storage classes
7833 in typenames, fields or parameters. */
7834 if (type_quals != TYPE_UNQUALIFIED)
7835 type_quals = TYPE_UNQUALIFIED;
7837 /* Special case: "friend class foo" looks like a TYPENAME context. */
7840 if (type_quals != TYPE_UNQUALIFIED)
7842 error ("type qualifiers specified for friend class declaration");
7843 type_quals = TYPE_UNQUALIFIED;
7847 error ("%<inline%> specified for friend class declaration");
7853 /* Don't allow friend declaration without a class-key. */
7854 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
7855 pedwarn ("template parameters cannot be friends");
7856 else if (TREE_CODE (type) == TYPENAME_TYPE)
7857 pedwarn ("friend declaration requires class-key, "
7858 "i.e. %<friend class %T::%D%>",
7859 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
7861 pedwarn ("friend declaration requires class-key, "
7862 "i.e. %<friend %#T%>",
7866 /* Only try to do this stuff if we didn't already give up. */
7867 if (type != integer_type_node)
7869 /* A friendly class? */
7870 if (current_class_type)
7871 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
7874 error ("trying to make class %qT a friend of global scope",
7877 type = void_type_node;
7882 if (ctype == NULL_TREE)
7884 if (TREE_CODE (type) != METHOD_TYPE)
7885 error ("invalid qualifiers on non-member function type");
7887 ctype = TYPE_METHOD_BASETYPE (type);
7891 tree dummy = build_decl (TYPE_DECL, unqualified_id, type);
7892 grok_method_quals (ctype, dummy, quals);
7893 type = TREE_TYPE (dummy);
7899 else if (unqualified_id == NULL_TREE && decl_context != PARM
7900 && decl_context != CATCHPARM
7901 && TREE_CODE (type) != UNION_TYPE
7904 error ("abstract declarator %qT used as declaration", type);
7905 return error_mark_node;
7908 /* Only functions may be declared using an operator-function-id. */
7910 && IDENTIFIER_OPNAME_P (unqualified_id)
7911 && TREE_CODE (type) != FUNCTION_TYPE
7912 && TREE_CODE (type) != METHOD_TYPE)
7914 error ("declaration of %qD as non-function", unqualified_id);
7915 return error_mark_node;
7918 /* We don't check parameter types here because we can emit a better
7919 error message later. */
7920 if (decl_context != PARM)
7921 type = check_var_type (unqualified_id, type);
7923 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
7924 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
7926 if (decl_context == PARM || decl_context == CATCHPARM)
7928 if (ctype || in_namespace)
7929 error ("cannot use %<::%> in parameter declaration");
7931 /* A parameter declared as an array of T is really a pointer to T.
7932 One declared as a function is really a pointer to a function.
7933 One declared as a member is really a pointer to member. */
7935 if (TREE_CODE (type) == ARRAY_TYPE)
7937 /* Transfer const-ness of array into that of type pointed to. */
7938 type = build_pointer_type (TREE_TYPE (type));
7939 type_quals = TYPE_UNQUALIFIED;
7941 else if (TREE_CODE (type) == FUNCTION_TYPE)
7942 type = build_pointer_type (type);
7948 if (decl_context == PARM)
7950 decl = cp_build_parm_decl (unqualified_id, type);
7952 bad_specifiers (decl, "parameter", virtualp, quals != TYPE_UNQUALIFIED,
7953 inlinep, friendp, raises != NULL_TREE);
7955 else if (decl_context == FIELD)
7957 /* The C99 flexible array extension. */
7958 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
7959 && TYPE_DOMAIN (type) == NULL_TREE)
7961 tree itype = compute_array_index_type (dname, integer_zero_node);
7962 type = build_cplus_array_type (TREE_TYPE (type), itype);
7965 if (type == error_mark_node)
7967 /* Happens when declaring arrays of sizes which
7968 are error_mark_node, for example. */
7971 else if (in_namespace && !friendp)
7973 /* Something like struct S { int N::j; }; */
7974 error ("invalid use of %<::%>");
7977 else if (TREE_CODE (type) == FUNCTION_TYPE)
7980 tree function_context;
7984 if (ctype == NULL_TREE)
7985 ctype = current_class_type;
7987 if (ctype == NULL_TREE)
7989 error ("can't make %qD into a method -- not in a class",
7991 return void_type_node;
7994 /* ``A union may [ ... ] not [ have ] virtual functions.''
7996 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
7998 error ("function %qD declared virtual inside a union",
8000 return void_type_node;
8003 if (NEW_DELETE_OPNAME_P (unqualified_id))
8007 error ("%qD cannot be declared virtual, since it "
8013 else if (staticp < 2)
8014 type = build_method_type_directly (ctype,
8016 TYPE_ARG_TYPES (type));
8019 /* Check that the name used for a destructor makes sense. */
8020 if (sfk == sfk_destructor
8021 && !same_type_p (TREE_OPERAND
8022 (id_declarator->u.id.unqualified_name, 0),
8025 error ("declaration of %qD as member of %qT",
8026 id_declarator->u.id.unqualified_name,
8028 return error_mark_node;
8031 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
8032 function_context = (ctype != NULL_TREE) ?
8033 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
8034 publicp = (! friendp || ! staticp)
8035 && function_context == NULL_TREE;
8036 decl = grokfndecl (ctype, type,
8037 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
8038 ? unqualified_id : dname,
8041 virtualp, flags, quals, raises,
8042 friendp ? -1 : 0, friendp, publicp, inlinep,
8044 funcdef_flag, template_count, in_namespace, attrlist);
8045 if (decl == NULL_TREE)
8048 /* This clobbers the attrs stored in `decl' from `attrlist'. */
8049 /* The decl and setting of decl_attr is also turned off. */
8050 decl = build_decl_attribute_variant (decl, decl_attr);
8053 /* [class.conv.ctor]
8055 A constructor declared without the function-specifier
8056 explicit that can be called with a single parameter
8057 specifies a conversion from the type of its first
8058 parameter to the type of its class. Such a constructor
8059 is called a converting constructor. */
8061 DECL_NONCONVERTING_P (decl) = 1;
8062 else if (DECL_CONSTRUCTOR_P (decl))
8064 /* The constructor can be called with exactly one
8065 parameter if there is at least one parameter, and
8066 any subsequent parameters have default arguments.
8067 Ignore any compiler-added parms. */
8068 tree arg_types = FUNCTION_FIRST_USER_PARMTYPE (decl);
8070 if (arg_types == void_list_node
8072 && TREE_CHAIN (arg_types)
8073 && TREE_CHAIN (arg_types) != void_list_node
8074 && !TREE_PURPOSE (TREE_CHAIN (arg_types))))
8075 DECL_NONCONVERTING_P (decl) = 1;
8078 else if (TREE_CODE (type) == METHOD_TYPE)
8080 /* We only get here for friend declarations of
8081 members of other classes. */
8082 /* All method decls are public, so tell grokfndecl to set
8083 TREE_PUBLIC, also. */
8084 decl = grokfndecl (ctype, type,
8085 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
8086 ? unqualified_id : dname,
8089 virtualp, flags, quals, raises,
8090 friendp ? -1 : 0, friendp, 1, 0, sfk,
8091 funcdef_flag, template_count, in_namespace,
8093 if (decl == NULL_TREE)
8096 else if (!staticp && !dependent_type_p (type)
8097 && !COMPLETE_TYPE_P (complete_type (type))
8098 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
8101 error ("field %qD has incomplete type", unqualified_id);
8103 error ("name %qT has incomplete type", type);
8105 /* If we're instantiating a template, tell them which
8106 instantiation made the field's type be incomplete. */
8107 if (current_class_type
8108 && TYPE_NAME (current_class_type)
8109 && IDENTIFIER_TEMPLATE (TYPE_IDENTIFIER (current_class_type))
8111 && declspecs->type == type)
8112 error (" in instantiation of template %qT",
8113 current_class_type);
8115 type = error_mark_node;
8122 error ("%qE is neither function nor member function; "
8123 "cannot be declared friend", unqualified_id);
8131 /* Friends are treated specially. */
8132 if (ctype == current_class_type)
8133 warning (0, "member functions are implicitly friends of their class");
8134 else if (decl && DECL_NAME (decl))
8136 if (template_class_depth (current_class_type) == 0)
8138 decl = check_explicit_specialization
8139 (unqualified_id, decl, template_count,
8140 2 * (funcdef_flag != 0) + 4);
8141 if (decl == error_mark_node)
8142 return error_mark_node;
8145 decl = do_friend (ctype, unqualified_id, decl,
8146 *attrlist, flags, quals, funcdef_flag);
8150 return void_type_node;
8153 /* Structure field. It may not be a function, except for C++. */
8155 if (decl == NULL_TREE)
8161 /* An attempt is being made to initialize a non-static
8162 member. But, from [class.mem]:
8164 4 A member-declarator can contain a
8165 constant-initializer only if it declares a static
8166 member (_class.static_) of integral or enumeration
8167 type, see _class.static.data_.
8169 This used to be relatively common practice, but
8170 the rest of the compiler does not correctly
8171 handle the initialization unless the member is
8172 static so we make it static below. */
8173 pedwarn ("ISO C++ forbids initialization of member %qD",
8175 pedwarn ("making %qD static", unqualified_id);
8179 if (uses_template_parms (type))
8180 /* We'll check at instantiation time. */
8182 else if (check_static_variable_definition (unqualified_id,
8184 /* If we just return the declaration, crashes
8185 will sometimes occur. We therefore return
8186 void_type_node, as if this was a friend
8187 declaration, to cause callers to completely
8188 ignore this declaration. */
8189 return void_type_node;
8194 /* C++ allows static class members. All other work
8195 for this is done by grokfield. */
8196 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
8197 set_linkage_for_static_data_member (decl);
8198 /* Even if there is an in-class initialization, DECL
8199 is considered undefined until an out-of-class
8200 definition is provided. */
8201 DECL_EXTERNAL (decl) = 1;
8205 decl = build_decl (FIELD_DECL, unqualified_id, type);
8206 DECL_NONADDRESSABLE_P (decl) = bitfield;
8207 if (storage_class == sc_mutable)
8209 DECL_MUTABLE_P (decl) = 1;
8210 storage_class = sc_none;
8214 bad_specifiers (decl, "field", virtualp, quals != TYPE_UNQUALIFIED,
8215 inlinep, friendp, raises != NULL_TREE);
8218 else if (TREE_CODE (type) == FUNCTION_TYPE
8219 || TREE_CODE (type) == METHOD_TYPE)
8224 if (!unqualified_id)
8227 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
8228 original_name = dname;
8230 original_name = unqualified_id;
8232 if (storage_class == sc_auto)
8233 error ("storage class %<auto%> invalid for function %qs", name);
8234 else if (storage_class == sc_register)
8235 error ("storage class %<register%> invalid for function %qs", name);
8237 error ("storage class %<__thread%> invalid for function %qs", name);
8239 /* Function declaration not at top level.
8240 Storage classes other than `extern' are not allowed
8241 and `extern' makes no difference. */
8242 if (! toplevel_bindings_p ()
8243 && (storage_class == sc_static
8244 || declspecs->specs[(int)ds_inline])
8247 if (storage_class == sc_static)
8248 pedwarn ("%<static%> specified invalid for function %qs "
8249 "declared out of global scope", name);
8251 pedwarn ("%<inline%> specifier invalid for function %qs "
8252 "declared out of global scope", name);
8255 if (ctype == NULL_TREE)
8259 error ("virtual non-class function %qs", name);
8263 else if (TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
8264 && !NEW_DELETE_OPNAME_P (original_name))
8265 type = build_method_type_directly (ctype,
8267 TYPE_ARG_TYPES (type));
8269 /* Record presence of `static'. */
8270 publicp = (ctype != NULL_TREE
8271 || storage_class == sc_extern
8272 || storage_class != sc_static);
8274 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
8275 virtualp, flags, quals, raises,
8277 publicp, inlinep, sfk, funcdef_flag,
8278 template_count, in_namespace, attrlist);
8279 if (decl == NULL_TREE)
8284 int invalid_static = 0;
8286 /* Don't allow a static member function in a class, and forbid
8287 declaring main to be static. */
8288 if (TREE_CODE (type) == METHOD_TYPE)
8290 pedwarn ("cannot declare member function %qD to have "
8291 "static linkage", decl);
8294 else if (current_function_decl)
8296 /* FIXME need arm citation */
8297 error ("cannot declare static function inside another function");
8304 storage_class = sc_none;
8310 /* It's a variable. */
8312 /* An uninitialized decl with `extern' is a reference. */
8313 decl = grokvardecl (type, unqualified_id,
8316 (type_quals & TYPE_QUAL_CONST) != 0,
8317 ctype ? ctype : in_namespace);
8318 bad_specifiers (decl, "variable", virtualp, quals != TYPE_UNQUALIFIED,
8319 inlinep, friendp, raises != NULL_TREE);
8323 DECL_CONTEXT (decl) = ctype;
8326 pedwarn ("%<static%> may not be used when defining "
8327 "(as opposed to declaring) a static data member");
8329 storage_class = sc_none;
8331 if (storage_class == sc_register && TREE_STATIC (decl))
8333 error ("static member %qD declared %<register%>", decl);
8334 storage_class = sc_none;
8336 if (storage_class == sc_extern && pedantic)
8338 pedwarn ("cannot explicitly declare member %q#D to have "
8341 storage_class = sc_none;
8346 /* Record `register' declaration for warnings on &
8347 and in case doing stupid register allocation. */
8349 if (storage_class == sc_register)
8350 DECL_REGISTER (decl) = 1;
8351 else if (storage_class == sc_extern)
8352 DECL_THIS_EXTERN (decl) = 1;
8353 else if (storage_class == sc_static)
8354 DECL_THIS_STATIC (decl) = 1;
8356 /* Record constancy and volatility. There's no need to do this
8357 when processing a template; we'll do this for the instantiated
8358 declaration based on the type of DECL. */
8359 if (!processing_template_decl)
8360 cp_apply_type_quals_to_decl (type_quals, decl);
8366 /* Subroutine of start_function. Ensure that each of the parameter
8367 types (as listed in PARMS) is complete, as is required for a
8368 function definition. */
8371 require_complete_types_for_parms (tree parms)
8373 for (; parms; parms = TREE_CHAIN (parms))
8375 if (dependent_type_p (TREE_TYPE (parms)))
8377 if (!VOID_TYPE_P (TREE_TYPE (parms))
8378 && complete_type_or_else (TREE_TYPE (parms), parms))
8380 relayout_decl (parms);
8381 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
8384 /* grokparms or complete_type_or_else will have already issued
8386 TREE_TYPE (parms) = error_mark_node;
8390 /* Returns nonzero if T is a local variable. */
8393 local_variable_p (tree t)
8395 if ((TREE_CODE (t) == VAR_DECL
8396 /* A VAR_DECL with a context that is a _TYPE is a static data
8398 && !TYPE_P (CP_DECL_CONTEXT (t))
8399 /* Any other non-local variable must be at namespace scope. */
8400 && !DECL_NAMESPACE_SCOPE_P (t))
8401 || (TREE_CODE (t) == PARM_DECL))
8407 /* Returns nonzero if T is an automatic local variable or a label.
8408 (These are the declarations that need to be remapped when the code
8409 containing them is duplicated.) */
8412 nonstatic_local_decl_p (tree t)
8414 return ((local_variable_p (t) && !TREE_STATIC (t))
8415 || TREE_CODE (t) == LABEL_DECL
8416 || TREE_CODE (t) == RESULT_DECL);
8419 /* Like local_variable_p, but suitable for use as a tree-walking
8423 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
8424 void *data ATTRIBUTE_UNUSED)
8426 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
8428 else if (TYPE_P (*tp))
8435 /* Check that ARG, which is a default-argument expression for a
8436 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
8437 something goes wrong. DECL may also be a _TYPE node, rather than a
8438 DECL, if there is no DECL available. */
8441 check_default_argument (tree decl, tree arg)
8446 if (TREE_CODE (arg) == DEFAULT_ARG)
8447 /* We get a DEFAULT_ARG when looking at an in-class declaration
8448 with a default argument. Ignore the argument for now; we'll
8449 deal with it after the class is complete. */
8452 if (processing_template_decl || uses_template_parms (arg))
8453 /* We don't do anything checking until instantiation-time. Note
8454 that there may be uninstantiated arguments even for an
8455 instantiated function, since default arguments are not
8456 instantiated until they are needed. */
8465 decl_type = TREE_TYPE (decl);
8467 if (arg == error_mark_node
8468 || decl == error_mark_node
8469 || TREE_TYPE (arg) == error_mark_node
8470 || decl_type == error_mark_node)
8471 /* Something already went wrong. There's no need to check
8473 return error_mark_node;
8475 /* [dcl.fct.default]
8477 A default argument expression is implicitly converted to the
8479 if (!TREE_TYPE (arg)
8480 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
8483 error ("default argument for %q#D has type %qT",
8484 decl, TREE_TYPE (arg));
8486 error ("default argument for parameter of type %qT has type %qT",
8487 decl_type, TREE_TYPE (arg));
8489 return error_mark_node;
8492 /* [dcl.fct.default]
8494 Local variables shall not be used in default argument
8497 The keyword `this' shall not be used in a default argument of a
8499 var = walk_tree_without_duplicates (&arg, local_variable_p_walkfn,
8503 error ("default argument %qE uses local variable %qD", arg, var);
8504 return error_mark_node;
8511 /* Decode the list of parameter types for a function type.
8512 Given the list of things declared inside the parens,
8513 return a list of types.
8515 If this parameter does not end with an ellipsis, we append
8518 *PARMS is set to the chain of PARM_DECLs created. */
8521 grokparms (cp_parameter_declarator *first_parm, tree *parms)
8523 tree result = NULL_TREE;
8524 tree decls = NULL_TREE;
8525 int ellipsis = !first_parm || first_parm->ellipsis_p;
8526 cp_parameter_declarator *parm;
8529 for (parm = first_parm; parm != NULL; parm = parm->next)
8531 tree type = NULL_TREE;
8532 tree init = parm->default_argument;
8536 if (parm == no_parameters)
8539 attrs = parm->decl_specifiers.attributes;
8540 parm->decl_specifiers.attributes = NULL_TREE;
8541 decl = grokdeclarator (parm->declarator, &parm->decl_specifiers,
8542 PARM, init != NULL_TREE, &attrs);
8543 if (! decl || TREE_TYPE (decl) == error_mark_node)
8547 cplus_decl_attributes (&decl, attrs, 0);
8549 type = TREE_TYPE (decl);
8550 if (VOID_TYPE_P (type))
8552 if (same_type_p (type, void_type_node)
8553 && !DECL_NAME (decl) && !result && !parm->next && !ellipsis)
8554 /* this is a parmlist of `(void)', which is ok. */
8556 cxx_incomplete_type_error (decl, type);
8557 /* It's not a good idea to actually create parameters of
8558 type `void'; other parts of the compiler assume that a
8559 void type terminates the parameter list. */
8560 type = error_mark_node;
8561 TREE_TYPE (decl) = error_mark_node;
8564 if (type != error_mark_node)
8566 /* Top-level qualifiers on the parameters are
8567 ignored for function types. */
8568 type = cp_build_qualified_type (type, 0);
8569 if (TREE_CODE (type) == METHOD_TYPE)
8571 error ("parameter %qD invalidly declared method type", decl);
8572 type = build_pointer_type (type);
8573 TREE_TYPE (decl) = type;
8575 else if (abstract_virtuals_error (decl, type))
8576 any_error = 1; /* Seems like a good idea. */
8577 else if (POINTER_TYPE_P (type))
8579 /* [dcl.fct]/6, parameter types cannot contain pointers
8580 (references) to arrays of unknown bound. */
8581 tree t = TREE_TYPE (type);
8582 int ptr = TYPE_PTR_P (type);
8588 else if (TREE_CODE (t) != ARRAY_TYPE)
8590 else if (!TYPE_DOMAIN (t))
8594 if (TREE_CODE (t) == ARRAY_TYPE)
8595 error ("parameter %qD includes %s to array of unknown "
8597 decl, ptr ? "pointer" : "reference", t);
8600 if (!any_error && init)
8601 init = check_default_argument (decl, init);
8606 TREE_CHAIN (decl) = decls;
8608 result = tree_cons (init, type, result);
8610 decls = nreverse (decls);
8611 result = nreverse (result);
8613 result = chainon (result, void_list_node);
8620 /* D is a constructor or overloaded `operator='.
8622 Let T be the class in which D is declared. Then, this function
8625 -1 if D's is an ill-formed constructor or copy assignment operator
8626 whose first parameter is of type `T'.
8627 0 if D is not a copy constructor or copy assignment
8629 1 if D is a copy constructor or copy assignment operator whose
8630 first parameter is a reference to const qualified T.
8631 2 if D is a copy constructor or copy assignment operator whose
8632 first parameter is a reference to non-const qualified T.
8634 This function can be used as a predicate. Positive values indicate
8635 a copy constructor and nonzero values indicate a copy assignment
8645 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
8647 if (DECL_TEMPLATE_INFO (d)
8648 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d)))
8649 /* Instantiations of template member functions are never copy
8650 functions. Note that member functions of templated classes are
8651 represented as template functions internally, and we must
8652 accept those as copy functions. */
8655 args = FUNCTION_FIRST_USER_PARMTYPE (d);
8659 arg_type = TREE_VALUE (args);
8661 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
8663 /* Pass by value copy assignment operator. */
8666 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
8667 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
8669 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
8675 args = TREE_CHAIN (args);
8677 if (args && args != void_list_node && !TREE_PURPOSE (args))
8678 /* There are more non-optional args. */
8684 /* Remember any special properties of member function DECL. */
8686 void grok_special_member_properties (tree decl)
8688 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P(decl))
8689 ; /* Not special. */
8690 else if (DECL_CONSTRUCTOR_P (decl))
8692 int ctor = copy_fn_p (decl);
8698 A non-template constructor for class X is a copy
8699 constructor if its first parameter is of type X&, const
8700 X&, volatile X& or const volatile X&, and either there
8701 are no other parameters or else all other parameters have
8702 default arguments. */
8703 TYPE_HAS_INIT_REF (DECL_CONTEXT (decl)) = 1;
8705 TYPE_HAS_CONST_INIT_REF (DECL_CONTEXT (decl)) = 1;
8707 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
8708 TYPE_HAS_DEFAULT_CONSTRUCTOR (DECL_CONTEXT (decl)) = 1;
8710 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
8714 A non-template assignment operator for class X is a copy
8715 assignment operator if its parameter is of type X, X&, const
8716 X&, volatile X& or const volatile X&. */
8718 int assop = copy_fn_p (decl);
8722 TYPE_HAS_ASSIGN_REF (DECL_CONTEXT (decl)) = 1;
8724 TYPE_HAS_CONST_ASSIGN_REF (DECL_CONTEXT (decl)) = 1;
8729 /* Check a constructor DECL has the correct form. Complains
8730 if the class has a constructor of the form X(X). */
8733 grok_ctor_properties (tree ctype, tree decl)
8735 int ctor_parm = copy_fn_p (decl);
8741 A declaration of a constructor for a class X is ill-formed if
8742 its first parameter is of type (optionally cv-qualified) X
8743 and either there are no other parameters or else all other
8744 parameters have default arguments.
8746 We *don't* complain about member template instantiations that
8747 have this form, though; they can occur as we try to decide
8748 what constructor to use during overload resolution. Since
8749 overload resolution will never prefer such a constructor to
8750 the non-template copy constructor (which is either explicitly
8751 or implicitly defined), there's no need to worry about their
8752 existence. Theoretically, they should never even be
8753 instantiated, but that's hard to forestall. */
8754 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
8762 /* An operator with this code is unary, but can also be binary. */
8765 ambi_op_p (enum tree_code code)
8767 return (code == INDIRECT_REF
8768 || code == ADDR_EXPR
8769 || code == UNARY_PLUS_EXPR
8770 || code == NEGATE_EXPR
8771 || code == PREINCREMENT_EXPR
8772 || code == PREDECREMENT_EXPR);
8775 /* An operator with this name can only be unary. */
8778 unary_op_p (enum tree_code code)
8780 return (code == TRUTH_NOT_EXPR
8781 || code == BIT_NOT_EXPR
8782 || code == COMPONENT_REF
8783 || code == TYPE_EXPR);
8786 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
8787 errors are issued for invalid declarations. */
8790 grok_op_properties (tree decl, bool complain)
8792 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
8794 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
8795 tree name = DECL_NAME (decl);
8796 enum tree_code operator_code;
8800 /* Count the number of arguments. */
8801 for (argtype = argtypes, arity = 0;
8802 argtype && argtype != void_list_node;
8803 argtype = TREE_CHAIN (argtype))
8806 class_type = DECL_CONTEXT (decl);
8807 if (class_type && !CLASS_TYPE_P (class_type))
8808 class_type = NULL_TREE;
8810 if (DECL_CONV_FN_P (decl))
8811 operator_code = TYPE_EXPR;
8815 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
8816 if (ansi_opname (CODE) == name) \
8818 operator_code = (CODE); \
8821 else if (ansi_assopname (CODE) == name) \
8823 operator_code = (CODE); \
8824 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
8828 #include "operators.def"
8834 gcc_assert (operator_code != LAST_CPLUS_TREE_CODE);
8835 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
8838 switch (operator_code)
8841 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
8845 TYPE_GETS_DELETE (class_type) |= 1;
8849 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
8852 case VEC_DELETE_EXPR:
8853 TYPE_GETS_DELETE (class_type) |= 2;
8860 /* [basic.std.dynamic.allocation]/1:
8862 A program is ill-formed if an allocation function is declared
8863 in a namespace scope other than global scope or declared static
8866 The same also holds true for deallocation functions. */
8867 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
8868 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
8870 if (DECL_NAMESPACE_SCOPE_P (decl))
8872 if (CP_DECL_CONTEXT (decl) != global_namespace)
8873 error ("%qD may not be declared within a namespace", decl);
8874 else if (!TREE_PUBLIC (decl))
8875 error ("%qD may not be declared as static", decl);
8879 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
8880 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
8881 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
8882 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
8885 /* An operator function must either be a non-static member function
8886 or have at least one parameter of a class, a reference to a class,
8887 an enumeration, or a reference to an enumeration. 13.4.0.6 */
8888 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
8890 if (operator_code == TYPE_EXPR
8891 || operator_code == CALL_EXPR
8892 || operator_code == COMPONENT_REF
8893 || operator_code == ARRAY_REF
8894 || operator_code == NOP_EXPR)
8896 error ("%qD must be a nonstatic member function", decl);
8903 if (DECL_STATIC_FUNCTION_P (decl))
8905 error ("%qD must be either a non-static member "
8906 "function or a non-member function", decl);
8910 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
8912 tree arg = non_reference (TREE_VALUE (p));
8913 /* IS_AGGR_TYPE, rather than CLASS_TYPE_P, is used
8914 because these checks are performed even on
8915 template functions. */
8916 if (IS_AGGR_TYPE (arg) || TREE_CODE (arg) == ENUMERAL_TYPE)
8920 if (!p || p == void_list_node)
8925 error ("%qD must have an argument of class or "
8932 /* There are no restrictions on the arguments to an overloaded
8934 if (operator_code == CALL_EXPR)
8937 /* Warn about conversion operators that will never be used. */
8938 if (IDENTIFIER_TYPENAME_P (name)
8939 && ! DECL_TEMPLATE_INFO (decl)
8941 /* Warn only declaring the function; there is no need to
8942 warn again about out-of-class definitions. */
8943 && class_type == current_class_type)
8945 tree t = TREE_TYPE (name);
8946 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
8947 const char *what = 0;
8950 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
8952 if (TREE_CODE (t) == VOID_TYPE)
8954 else if (class_type)
8956 if (t == class_type)
8957 what = "the same type";
8958 /* Don't force t to be complete here. */
8959 else if (IS_AGGR_TYPE (t)
8960 && COMPLETE_TYPE_P (t)
8961 && DERIVED_FROM_P (t, class_type))
8962 what = "a base class";
8966 warning (0, "conversion to %s%s will never use a type "
8967 "conversion operator",
8968 ref ? "a reference to " : "", what);
8970 if (operator_code == COND_EXPR)
8973 error ("ISO C++ prohibits overloading operator ?:");
8975 else if (ambi_op_p (operator_code))
8978 /* We pick the one-argument operator codes by default, so
8979 we don't have to change anything. */
8981 else if (arity == 2)
8983 /* If we thought this was a unary operator, we now know
8984 it to be a binary operator. */
8985 switch (operator_code)
8988 operator_code = MULT_EXPR;
8992 operator_code = BIT_AND_EXPR;
8995 case UNARY_PLUS_EXPR:
8996 operator_code = PLUS_EXPR;
9000 operator_code = MINUS_EXPR;
9003 case PREINCREMENT_EXPR:
9004 operator_code = POSTINCREMENT_EXPR;
9007 case PREDECREMENT_EXPR:
9008 operator_code = POSTDECREMENT_EXPR;
9015 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
9017 if ((operator_code == POSTINCREMENT_EXPR
9018 || operator_code == POSTDECREMENT_EXPR)
9019 && ! processing_template_decl
9020 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
9023 error ("postfix %qD must take %<int%> as its argument",
9027 ("postfix %qD must take %<int%> as its second argument",
9034 error ("%qD must take either zero or one argument", decl);
9036 error ("%qD must take either one or two arguments", decl);
9039 /* More Effective C++ rule 6. */
9041 && (operator_code == POSTINCREMENT_EXPR
9042 || operator_code == POSTDECREMENT_EXPR
9043 || operator_code == PREINCREMENT_EXPR
9044 || operator_code == PREDECREMENT_EXPR))
9046 tree arg = TREE_VALUE (argtypes);
9047 tree ret = TREE_TYPE (TREE_TYPE (decl));
9048 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
9049 arg = TREE_TYPE (arg);
9050 arg = TYPE_MAIN_VARIANT (arg);
9051 if (operator_code == PREINCREMENT_EXPR
9052 || operator_code == PREDECREMENT_EXPR)
9054 if (TREE_CODE (ret) != REFERENCE_TYPE
9055 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
9057 warning (0, "prefix %qD should return %qT", decl,
9058 build_reference_type (arg));
9062 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
9063 warning (0, "postfix %qD should return %qT", decl, arg);
9067 else if (unary_op_p (operator_code))
9072 error ("%qD must take %<void%>", decl);
9074 error ("%qD must take exactly one argument", decl);
9077 else /* if (binary_op_p (operator_code)) */
9082 error ("%qD must take exactly one argument", decl);
9084 error ("%qD must take exactly two arguments", decl);
9087 /* More Effective C++ rule 7. */
9089 && (operator_code == TRUTH_ANDIF_EXPR
9090 || operator_code == TRUTH_ORIF_EXPR
9091 || operator_code == COMPOUND_EXPR))
9092 warning (0, "user-defined %qD always evaluates both arguments",
9096 /* Effective C++ rule 23. */
9099 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
9100 && (operator_code == PLUS_EXPR
9101 || operator_code == MINUS_EXPR
9102 || operator_code == TRUNC_DIV_EXPR
9103 || operator_code == MULT_EXPR
9104 || operator_code == TRUNC_MOD_EXPR)
9105 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
9106 warning (0, "%qD should return by value", decl);
9109 for (; argtypes && argtypes != void_list_node;
9110 argtypes = TREE_CHAIN (argtypes))
9111 if (TREE_PURPOSE (argtypes))
9113 TREE_PURPOSE (argtypes) = NULL_TREE;
9114 if (operator_code == POSTINCREMENT_EXPR
9115 || operator_code == POSTDECREMENT_EXPR)
9118 pedwarn ("%qD cannot have default arguments", decl);
9121 error ("%qD cannot have default arguments", decl);
9128 /* Return a string giving the keyword associate with CODE. */
9131 tag_name (enum tag_types code)
9150 /* Name lookup in an elaborated-type-specifier (after the keyword
9151 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
9152 elaborated-type-specifier is invalid, issue a diagnostic and return
9153 error_mark_node; otherwise, return the *_TYPE to which it referred.
9154 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
9157 check_elaborated_type_specifier (enum tag_types tag_code,
9159 bool allow_template_p)
9165 struct S { struct S *p; };
9167 name lookup will find the TYPE_DECL for the implicit "S::S"
9168 typedef. Adjust for that here. */
9169 if (DECL_SELF_REFERENCE_P (decl))
9170 decl = TYPE_NAME (TREE_TYPE (decl));
9172 type = TREE_TYPE (decl);
9174 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
9175 is false for this case as well. */
9176 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
9178 error ("using template type parameter %qT after %qs",
9179 type, tag_name (tag_code));
9180 return error_mark_node;
9184 If the identifier resolves to a typedef-name or a template
9185 type-parameter, the elaborated-type-specifier is ill-formed.
9187 In other words, the only legitimate declaration to use in the
9188 elaborated type specifier is the implicit typedef created when
9189 the type is declared. */
9190 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
9191 && tag_code != typename_type)
9193 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
9194 error ("%q+D has a previous declaration here", decl);
9195 return error_mark_node;
9197 else if (TREE_CODE (type) != RECORD_TYPE
9198 && TREE_CODE (type) != UNION_TYPE
9199 && tag_code != enum_type
9200 && tag_code != typename_type)
9202 error ("%qT referred to as %qs", type, tag_name (tag_code));
9203 error ("%q+T has a previous declaration here", type);
9204 return error_mark_node;
9206 else if (TREE_CODE (type) != ENUMERAL_TYPE
9207 && tag_code == enum_type)
9209 error ("%qT referred to as enum", type);
9210 error ("%q+T has a previous declaration here", type);
9211 return error_mark_node;
9213 else if (!allow_template_p
9214 && TREE_CODE (type) == RECORD_TYPE
9215 && CLASSTYPE_IS_TEMPLATE (type))
9217 /* If a class template appears as elaborated type specifier
9218 without a template header such as:
9220 template <class T> class C {};
9221 void f(class C); // No template header here
9223 then the required template argument is missing. */
9224 error ("template argument required for %<%s %T%>",
9225 tag_name (tag_code),
9226 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
9227 return error_mark_node;
9233 /* Lookup NAME in elaborate type specifier in scope according to
9234 SCOPE and issue diagnostics if necessary.
9235 Return *_TYPE node upon success, NULL_TREE when the NAME is not
9236 found, and ERROR_MARK_NODE for type error. */
9239 lookup_and_check_tag (enum tag_types tag_code, tree name,
9240 tag_scope scope, bool template_header_p)
9244 if (scope == ts_global)
9246 /* First try ordinary name lookup, ignoring hidden class name
9247 injected via friend declaration. */
9248 decl = lookup_name (name, 2);
9249 /* If that fails, the name will be placed in the smallest
9250 non-class, non-function-prototype scope according to 3.3.1/5.
9251 We may already have a hidden name declared as friend in this
9252 scope. So lookup again but not ignoring hidden name.
9253 If we find one, that name will be made visible rather than
9254 creating a new tag. */
9256 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
9259 decl = lookup_type_scope (name, scope);
9261 if (decl && DECL_CLASS_TEMPLATE_P (decl))
9262 decl = DECL_TEMPLATE_RESULT (decl);
9264 if (decl && TREE_CODE (decl) == TYPE_DECL)
9266 /* Look for invalid nested type:
9270 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
9272 error ("%qD has the same name as the class in which it is "
9275 return error_mark_node;
9278 /* Two cases we need to consider when deciding if a class
9279 template is allowed as an elaborated type specifier:
9280 1. It is a self reference to its own class.
9281 2. It comes with a template header.
9285 template <class T> class C {
9286 class C *c1; // DECL_SELF_REFERENCE_P is true
9289 template <class U> class C; // template_header_p is true
9290 template <class T> class C<T>::D {
9291 class C *c2; // DECL_SELF_REFERENCE_P is true
9294 t = check_elaborated_type_specifier (tag_code,
9297 | DECL_SELF_REFERENCE_P (decl));
9304 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
9305 Define the tag as a forward-reference if it is not defined.
9307 If a declaration is given, process it here, and report an error if
9308 multiple declarations are not identical.
9310 SCOPE is TS_CURRENT when this is also a definition. Only look in
9311 the current frame for the name (since C++ allows new names in any
9312 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
9313 declaration. Only look beginning from the current scope outward up
9314 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
9316 TEMPLATE_HEADER_P is true when this declaration is preceded by
9317 a set of template parameters. */
9320 xref_tag (enum tag_types tag_code, tree name,
9321 tag_scope scope, bool template_header_p)
9323 enum tree_code code;
9325 tree context = NULL_TREE;
9327 timevar_push (TV_NAME_LOOKUP);
9329 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
9341 code = ENUMERAL_TYPE;
9347 /* In case of anonymous name, xref_tag is only called to
9348 make type node and push name. Name lookup is not required. */
9349 if (ANON_AGGRNAME_P (name))
9352 t = lookup_and_check_tag (tag_code, name,
9353 scope, template_header_p);
9355 if (t == error_mark_node)
9356 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
9358 if (scope != ts_current && t && current_class_type
9359 && template_class_depth (current_class_type)
9360 && template_header_p)
9362 /* Since SCOPE is not TS_CURRENT, we are not looking at a
9363 definition of this tag. Since, in addition, we are currently
9364 processing a (member) template declaration of a template
9365 class, we must be very careful; consider:
9372 { template <class V>
9373 friend struct S1; };
9375 Here, the S2::S1 declaration should not be confused with the
9376 outer declaration. In particular, the inner version should
9377 have a template parameter of level 2, not level 1. This
9378 would be particularly important if the member declaration
9381 template <class V = U> friend struct S1;
9383 say, when we should tsubst into `U' when instantiating
9384 S2. On the other hand, when presented with:
9394 we must find the inner binding eventually. We
9395 accomplish this by making sure that the new type we
9396 create to represent this declaration has the right
9398 context = TYPE_CONTEXT (t);
9404 /* If no such tag is yet defined, create a forward-reference node
9405 and record it as the "definition".
9406 When a real declaration of this type is found,
9407 the forward-reference will be altered into a real type. */
9408 if (code == ENUMERAL_TYPE)
9410 error ("use of enum %q#D without previous declaration", name);
9411 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
9415 t = make_aggr_type (code);
9416 TYPE_CONTEXT (t) = context;
9417 t = pushtag (name, t, scope);
9422 if (template_header_p && IS_AGGR_TYPE (t))
9423 redeclare_class_template (t, current_template_parms);
9424 else if (!processing_template_decl
9426 && CLASSTYPE_IS_TEMPLATE (t))
9428 error ("redeclaration of %qT as a non-template", t);
9429 t = error_mark_node;
9432 /* Make injected friend class visible. */
9433 if (scope != ts_within_enclosing_non_class
9434 && hidden_name_p (TYPE_NAME (t)))
9436 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
9437 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
9439 if (TYPE_TEMPLATE_INFO (t))
9441 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
9442 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
9447 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t);
9451 xref_tag_from_type (tree old, tree id, tag_scope scope)
9453 enum tag_types tag_kind;
9455 if (TREE_CODE (old) == RECORD_TYPE)
9456 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
9458 tag_kind = union_type;
9460 if (id == NULL_TREE)
9461 id = TYPE_IDENTIFIER (old);
9463 return xref_tag (tag_kind, id, scope, false);
9466 /* Create the binfo hierarchy for REF with (possibly NULL) base list
9467 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
9468 access_* node, and the TREE_VALUE is the type of the base-class.
9469 Non-NULL TREE_TYPE indicates virtual inheritance. */
9472 xref_basetypes (tree ref, tree base_list)
9475 tree binfo, base_binfo;
9476 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
9477 unsigned max_bases = 0; /* Maximum direct bases. */
9479 tree default_access;
9480 tree igo_prev; /* Track Inheritance Graph Order. */
9482 if (ref == error_mark_node)
9485 /* The base of a derived class is private by default, all others are
9487 default_access = (TREE_CODE (ref) == RECORD_TYPE
9488 && CLASSTYPE_DECLARED_CLASS (ref)
9489 ? access_private_node : access_public_node);
9491 /* First, make sure that any templates in base-classes are
9492 instantiated. This ensures that if we call ourselves recursively
9493 we do not get confused about which classes are marked and which
9498 tree basetype = TREE_VALUE (*basep);
9500 if (!(processing_template_decl && uses_template_parms (basetype))
9501 && !complete_type_or_else (basetype, NULL))
9502 /* An incomplete type. Remove it from the list. */
9503 *basep = TREE_CHAIN (*basep);
9507 if (TREE_TYPE (*basep))
9509 if (CLASS_TYPE_P (basetype))
9510 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
9511 basep = &TREE_CHAIN (*basep);
9515 TYPE_MARKED_P (ref) = 1;
9517 /* The binfo slot should be empty, unless this is an (ill-formed)
9519 gcc_assert (!TYPE_BINFO (ref) || TYPE_SIZE (ref));
9520 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
9522 binfo = make_tree_binfo (max_bases);
9524 TYPE_BINFO (ref) = binfo;
9525 BINFO_OFFSET (binfo) = size_zero_node;
9526 BINFO_TYPE (binfo) = ref;
9530 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
9531 /* An aggregate cannot have baseclasses. */
9532 CLASSTYPE_NON_AGGREGATE (ref) = 1;
9534 if (TREE_CODE (ref) == UNION_TYPE)
9535 error ("derived union %qT invalid", ref);
9540 if (TYPE_FOR_JAVA (ref))
9541 error ("Java class %qT cannot have multiple bases", ref);
9546 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
9548 if (TYPE_FOR_JAVA (ref))
9549 error ("Java class %qT cannot have virtual bases", ref);
9552 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
9554 tree access = TREE_PURPOSE (base_list);
9555 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
9556 tree basetype = TREE_VALUE (base_list);
9558 if (access == access_default_node)
9559 access = default_access;
9561 if (TREE_CODE (basetype) == TYPE_DECL)
9562 basetype = TREE_TYPE (basetype);
9563 if (TREE_CODE (basetype) != RECORD_TYPE
9564 && TREE_CODE (basetype) != TYPENAME_TYPE
9565 && TREE_CODE (basetype) != TEMPLATE_TYPE_PARM
9566 && TREE_CODE (basetype) != BOUND_TEMPLATE_TEMPLATE_PARM)
9568 error ("base type %qT fails to be a struct or class type",
9573 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
9574 TYPE_FOR_JAVA (ref) = 1;
9576 base_binfo = NULL_TREE;
9577 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
9579 base_binfo = TYPE_BINFO (basetype);
9580 /* The original basetype could have been a typedef'd type. */
9581 basetype = BINFO_TYPE (base_binfo);
9583 /* Inherit flags from the base. */
9584 TYPE_HAS_NEW_OPERATOR (ref)
9585 |= TYPE_HAS_NEW_OPERATOR (basetype);
9586 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
9587 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
9588 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
9589 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
9590 CLASSTYPE_DIAMOND_SHAPED_P (ref)
9591 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
9592 CLASSTYPE_REPEATED_BASE_P (ref)
9593 |= CLASSTYPE_REPEATED_BASE_P (basetype);
9596 /* We must do this test after we've seen through a typedef
9598 if (TYPE_MARKED_P (basetype))
9600 if (basetype == ref)
9601 error ("recursive type %qT undefined", basetype);
9603 error ("duplicate base type %qT invalid", basetype);
9606 TYPE_MARKED_P (basetype) = 1;
9608 base_binfo = copy_binfo (base_binfo, basetype, ref,
9609 &igo_prev, via_virtual);
9610 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
9611 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
9613 BINFO_BASE_APPEND (binfo, base_binfo);
9614 BINFO_BASE_ACCESS_APPEND (binfo, access);
9617 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
9618 /* If we have space in the vbase vector, we must have shared at
9619 least one of them, and are therefore diamond shaped. */
9620 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
9622 /* Unmark all the types. */
9623 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
9624 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
9625 TYPE_MARKED_P (ref) = 0;
9627 /* Now see if we have a repeated base type. */
9628 if (!CLASSTYPE_REPEATED_BASE_P (ref))
9630 for (base_binfo = binfo; base_binfo;
9631 base_binfo = TREE_CHAIN (base_binfo))
9633 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
9635 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
9638 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
9640 for (base_binfo = binfo; base_binfo;
9641 base_binfo = TREE_CHAIN (base_binfo))
9642 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
9643 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
9650 /* Begin compiling the definition of an enumeration type.
9652 Returns the type object, as yet incomplete.
9653 Also records info about it so that build_enumerator
9654 may be used to declare the individual values as they are read. */
9657 start_enum (tree name)
9661 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
9663 /* If this is the real definition for a previous forward reference,
9664 fill in the contents in the same object that used to be the
9665 forward reference. */
9667 enumtype = lookup_and_check_tag (enum_type, name,
9668 /*tag_scope=*/ts_current,
9669 /*template_header_p=*/false);
9671 if (enumtype != NULL_TREE && TREE_CODE (enumtype) == ENUMERAL_TYPE)
9673 error ("multiple definition of %q#T", enumtype);
9674 error ("%Jprevious definition here", TYPE_MAIN_DECL (enumtype));
9675 /* Clear out TYPE_VALUES, and start again. */
9676 TYPE_VALUES (enumtype) = NULL_TREE;
9680 /* In case of error, make a dummy enum to allow parsing to
9682 if (enumtype == error_mark_node)
9683 name = make_anon_name ();
9685 enumtype = make_node (ENUMERAL_TYPE);
9686 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
9692 /* After processing and defining all the values of an enumeration type,
9693 install their decls in the enumeration type and finish it off.
9694 ENUMTYPE is the type object and VALUES a list of name-value pairs. */
9697 finish_enum (tree enumtype)
9706 bool use_short_enum;
9710 integer_type_kind itk;
9711 tree underlying_type = NULL_TREE;
9713 /* We built up the VALUES in reverse order. */
9714 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
9716 /* For an enum defined in a template, just set the type of the values;
9717 all further processing is postponed until the template is
9718 instantiated. We need to set the type so that tsubst of a CONST_DECL
9720 if (processing_template_decl)
9722 for (values = TYPE_VALUES (enumtype);
9724 values = TREE_CHAIN (values))
9725 TREE_TYPE (TREE_VALUE (values)) = enumtype;
9726 if (at_function_scope_p ())
9727 add_stmt (build_min (TAG_DEFN, enumtype));
9731 /* Determine the minimum and maximum values of the enumerators. */
9732 if (TYPE_VALUES (enumtype))
9734 minnode = maxnode = NULL_TREE;
9736 for (values = TYPE_VALUES (enumtype);
9738 values = TREE_CHAIN (values))
9740 decl = TREE_VALUE (values);
9742 /* [dcl.enum]: Following the closing brace of an enum-specifier,
9743 each enumerator has the type of its enumeration. Prior to the
9744 closing brace, the type of each enumerator is the type of its
9745 initializing value. */
9746 TREE_TYPE (decl) = enumtype;
9748 /* Update the minimum and maximum values, if appropriate. */
9749 value = DECL_INITIAL (decl);
9750 /* Figure out what the minimum and maximum values of the
9753 minnode = maxnode = value;
9754 else if (tree_int_cst_lt (maxnode, value))
9756 else if (tree_int_cst_lt (value, minnode))
9763 If the enumerator-list is empty, the underlying type is as if
9764 the enumeration had a single enumerator with value 0. */
9765 minnode = maxnode = integer_zero_node;
9767 /* Compute the number of bits require to represent all values of the
9768 enumeration. We must do this before the type of MINNODE and
9769 MAXNODE are transformed, since min_precision relies on the
9770 TREE_TYPE of the value it is passed. */
9771 unsignedp = tree_int_cst_sgn (minnode) >= 0;
9772 lowprec = min_precision (minnode, unsignedp);
9773 highprec = min_precision (maxnode, unsignedp);
9774 precision = MAX (lowprec, highprec);
9776 /* Determine the underlying type of the enumeration.
9780 The underlying type of an enumeration is an integral type that
9781 can represent all the enumerator values defined in the
9782 enumeration. It is implementation-defined which integral type is
9783 used as the underlying type for an enumeration except that the
9784 underlying type shall not be larger than int unless the value of
9785 an enumerator cannot fit in an int or unsigned int.
9787 We use "int" or an "unsigned int" as the underlying type, even if
9788 a smaller integral type would work, unless the user has
9789 explicitly requested that we use the smallest possible type. The
9790 user can request that for all enumerations with a command line
9791 flag, or for just one enumeration with an attribute. */
9793 use_short_enum = flag_short_enums
9794 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
9796 for (itk = (use_short_enum ? itk_char : itk_int);
9800 underlying_type = integer_types[itk];
9801 if (TYPE_PRECISION (underlying_type) >= precision
9802 && TYPE_UNSIGNED (underlying_type) == unsignedp)
9805 if (itk == itk_none)
9809 IF no integral type can represent all the enumerator values, the
9810 enumeration is ill-formed. */
9811 error ("no integral type can represent all of the enumerator values "
9812 "for %qT", enumtype);
9813 precision = TYPE_PRECISION (long_long_integer_type_node);
9814 underlying_type = integer_types[itk_unsigned_long_long];
9817 /* Compute the minium and maximum values for the type.
9821 For an enumeration where emin is the smallest enumerator and emax
9822 is the largest, the values of the enumeration are the values of the
9823 underlying type in the range bmin to bmax, where bmin and bmax are,
9824 respectively, the smallest and largest values of the smallest bit-
9825 field that can store emin and emax. */
9827 /* The middle-end currently assumes that types with TYPE_PRECISION
9828 narrower than their underlying type are suitably zero or sign
9829 extended to fill their mode. g++ doesn't make these guarantees.
9830 Until the middle-end can represent such paradoxical types, we
9831 set the TYPE_PRECISION to the width of the underlying type. */
9832 TYPE_PRECISION (enumtype) = TYPE_PRECISION (underlying_type);
9834 set_min_and_max_values_for_integral_type (enumtype, precision, unsignedp);
9838 The value of sizeof() applied to an enumeration type, an object
9839 of an enumeration type, or an enumerator, is the value of sizeof()
9840 applied to the underlying type. */
9841 TYPE_SIZE (enumtype) = TYPE_SIZE (underlying_type);
9842 TYPE_SIZE_UNIT (enumtype) = TYPE_SIZE_UNIT (underlying_type);
9843 TYPE_MODE (enumtype) = TYPE_MODE (underlying_type);
9844 TYPE_ALIGN (enumtype) = TYPE_ALIGN (underlying_type);
9845 TYPE_USER_ALIGN (enumtype) = TYPE_USER_ALIGN (underlying_type);
9846 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (underlying_type);
9848 /* Convert each of the enumerators to the type of the underlying
9849 type of the enumeration. */
9850 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
9852 decl = TREE_VALUE (values);
9853 value = perform_implicit_conversion (underlying_type,
9854 DECL_INITIAL (decl));
9856 /* Do not clobber shared ints. */
9857 value = copy_node (value);
9859 TREE_TYPE (value) = enumtype;
9860 DECL_INITIAL (decl) = value;
9861 TREE_VALUE (values) = value;
9864 /* Fix up all variant types of this enum type. */
9865 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
9867 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
9868 TYPE_MIN_VALUE (t) = TYPE_MIN_VALUE (enumtype);
9869 TYPE_MAX_VALUE (t) = TYPE_MAX_VALUE (enumtype);
9870 TYPE_SIZE (t) = TYPE_SIZE (enumtype);
9871 TYPE_SIZE_UNIT (t) = TYPE_SIZE_UNIT (enumtype);
9872 TYPE_MODE (t) = TYPE_MODE (enumtype);
9873 TYPE_PRECISION (t) = TYPE_PRECISION (enumtype);
9874 TYPE_ALIGN (t) = TYPE_ALIGN (enumtype);
9875 TYPE_USER_ALIGN (t) = TYPE_USER_ALIGN (enumtype);
9876 TYPE_UNSIGNED (t) = TYPE_UNSIGNED (enumtype);
9879 /* Finish debugging output for this type. */
9880 rest_of_type_compilation (enumtype, namespace_bindings_p ());
9883 /* Build and install a CONST_DECL for an enumeration constant of the
9884 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
9885 Assignment of sequential values by default is handled here. */
9888 build_enumerator (tree name, tree value, tree enumtype)
9894 /* If the VALUE was erroneous, pretend it wasn't there; that will
9895 result in the enum being assigned the next value in sequence. */
9896 if (value == error_mark_node)
9899 /* Remove no-op casts from the value. */
9901 STRIP_TYPE_NOPS (value);
9903 if (! processing_template_decl)
9905 /* Validate and default VALUE. */
9906 if (value != NULL_TREE)
9908 value = integral_constant_value (value);
9910 if (TREE_CODE (value) == INTEGER_CST)
9912 value = perform_integral_promotions (value);
9913 constant_expression_warning (value);
9917 error ("enumerator value for %qD not integer constant", name);
9922 /* Default based on previous value. */
9923 if (value == NULL_TREE)
9925 if (TYPE_VALUES (enumtype))
9928 unsigned HOST_WIDE_INT lo;
9932 /* The next value is the previous value plus one. We can
9933 safely assume that the previous value is an INTEGER_CST.
9934 add_double doesn't know the type of the target expression,
9935 so we must check with int_fits_type_p as well. */
9936 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
9937 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
9938 TREE_INT_CST_HIGH (prev_value),
9940 value = build_int_cst_wide (TREE_TYPE (prev_value), lo, hi);
9941 overflowed |= !int_fits_type_p (value, TREE_TYPE (prev_value));
9944 error ("overflow in enumeration values at %qD", name);
9947 value = integer_zero_node;
9950 /* Remove no-op casts from the value. */
9951 STRIP_TYPE_NOPS (value);
9954 /* C++ associates enums with global, function, or class declarations. */
9955 context = current_scope ();
9957 /* Build the actual enumeration constant. Note that the enumeration
9958 constants have the type of their initializers until the
9959 enumeration is complete:
9963 Following the closing brace of an enum-specifier, each enumer-
9964 ator has the type of its enumeration. Prior to the closing
9965 brace, the type of each enumerator is the type of its
9968 In finish_enum we will reset the type. Of course, if we're
9969 processing a template, there may be no value. */
9970 type = value ? TREE_TYPE (value) : NULL_TREE;
9972 if (context && context == current_class_type)
9973 /* This enum declaration is local to the class. We need the full
9974 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
9975 decl = build_lang_decl (CONST_DECL, name, type);
9977 /* It's a global enum, or it's local to a function. (Note local to
9978 a function could mean local to a class method. */
9979 decl = build_decl (CONST_DECL, name, type);
9981 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
9982 TREE_CONSTANT (decl) = 1;
9983 TREE_INVARIANT (decl) = 1;
9984 TREE_READONLY (decl) = 1;
9985 DECL_INITIAL (decl) = value;
9987 if (context && context == current_class_type)
9988 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
9989 on the TYPE_FIELDS list for `S'. (That's so that you can say
9990 things like `S::i' later.) */
9991 finish_member_declaration (decl);
9995 /* Add this enumeration constant to the list for this type. */
9996 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
10000 /* We're defining DECL. Make sure that it's type is OK. */
10003 check_function_type (tree decl, tree current_function_parms)
10005 tree fntype = TREE_TYPE (decl);
10006 tree return_type = complete_type (TREE_TYPE (fntype));
10008 /* In a function definition, arg types must be complete. */
10009 require_complete_types_for_parms (current_function_parms);
10011 if (dependent_type_p (return_type))
10013 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
10015 tree args = TYPE_ARG_TYPES (fntype);
10017 error ("return type %q#T is incomplete", return_type);
10019 /* Make it return void instead. */
10020 if (TREE_CODE (fntype) == METHOD_TYPE)
10021 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
10023 TREE_CHAIN (args));
10025 fntype = build_function_type (void_type_node, args);
10027 = build_exception_variant (fntype,
10028 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
10031 abstract_virtuals_error (decl, TREE_TYPE (fntype));
10034 /* Create the FUNCTION_DECL for a function definition.
10035 DECLSPECS and DECLARATOR are the parts of the declaration;
10036 they describe the function's name and the type it returns,
10037 but twisted together in a fashion that parallels the syntax of C.
10039 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
10040 DECLARATOR is really the DECL for the function we are about to
10041 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
10042 indicating that the function is an inline defined in-class.
10044 This function creates a binding context for the function body
10045 as well as setting up the FUNCTION_DECL in current_function_decl.
10047 For C++, we must first check whether that datum makes any sense.
10048 For example, "class A local_a(1,2);" means that variable local_a
10049 is an aggregate of type A, which should have a constructor
10050 applied to it with the argument list [1, 2]. */
10053 start_preparsed_function (tree decl1, tree attrs, int flags)
10055 tree ctype = NULL_TREE;
10058 int doing_friend = 0;
10059 struct cp_binding_level *bl;
10060 tree current_function_parms;
10061 struct c_fileinfo *finfo
10062 = get_fileinfo (lbasename (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1))));
10063 bool honor_interface;
10065 /* Sanity check. */
10066 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
10067 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
10069 fntype = TREE_TYPE (decl1);
10070 if (TREE_CODE (fntype) == METHOD_TYPE)
10071 ctype = TYPE_METHOD_BASETYPE (fntype);
10073 /* ISO C++ 11.4/5. A friend function defined in a class is in
10074 the (lexical) scope of the class in which it is defined. */
10075 if (!ctype && DECL_FRIEND_P (decl1))
10077 ctype = DECL_FRIEND_CONTEXT (decl1);
10079 /* CTYPE could be null here if we're dealing with a template;
10080 for example, `inline friend float foo()' inside a template
10081 will have no CTYPE set. */
10082 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
10088 if (DECL_DECLARED_INLINE_P (decl1)
10089 && lookup_attribute ("noinline", attrs))
10090 warning (0, "inline function %q+D given attribute noinline", decl1);
10092 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
10093 /* This is a constructor, we must ensure that any default args
10094 introduced by this definition are propagated to the clones
10095 now. The clones are used directly in overload resolution. */
10096 adjust_clone_args (decl1);
10098 /* Sometimes we don't notice that a function is a static member, and
10099 build a METHOD_TYPE for it. Fix that up now. */
10100 if (ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
10101 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE)
10103 revert_static_member_fn (decl1);
10107 /* Set up current_class_type, and enter the scope of the class, if
10110 push_nested_class (ctype);
10111 else if (DECL_STATIC_FUNCTION_P (decl1))
10112 push_nested_class (DECL_CONTEXT (decl1));
10114 /* Now that we have entered the scope of the class, we must restore
10115 the bindings for any template parameters surrounding DECL1, if it
10116 is an inline member template. (Order is important; consider the
10117 case where a template parameter has the same name as a field of
10118 the class.) It is not until after this point that
10119 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
10120 if (flags & SF_INCLASS_INLINE)
10121 maybe_begin_member_template_processing (decl1);
10123 /* Effective C++ rule 15. */
10125 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
10126 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
10127 warning (0, "%<operator=%> should return a reference to %<*this%>");
10129 /* Make the init_value nonzero so pushdecl knows this is not tentative.
10130 error_mark_node is replaced below (in poplevel) with the BLOCK. */
10131 if (!DECL_INITIAL (decl1))
10132 DECL_INITIAL (decl1) = error_mark_node;
10134 /* This function exists in static storage.
10135 (This does not mean `static' in the C sense!) */
10136 TREE_STATIC (decl1) = 1;
10138 /* We must call push_template_decl after current_class_type is set
10139 up. (If we are processing inline definitions after exiting a
10140 class scope, current_class_type will be NULL_TREE until set above
10141 by push_nested_class.) */
10142 if (processing_template_decl)
10144 /* FIXME: Handle error_mark_node more gracefully. */
10145 tree newdecl1 = push_template_decl (decl1);
10146 if (newdecl1 != error_mark_node)
10150 /* We are now in the scope of the function being defined. */
10151 current_function_decl = decl1;
10153 /* Save the parm names or decls from this function's declarator
10154 where store_parm_decls will find them. */
10155 current_function_parms = DECL_ARGUMENTS (decl1);
10157 /* Make sure the parameter and return types are reasonable. When
10158 you declare a function, these types can be incomplete, but they
10159 must be complete when you define the function. */
10160 check_function_type (decl1, current_function_parms);
10162 /* Build the return declaration for the function. */
10163 restype = TREE_TYPE (fntype);
10164 /* Promote the value to int before returning it. */
10165 if (c_promoting_integer_type_p (restype))
10166 restype = type_promotes_to (restype);
10167 if (DECL_RESULT (decl1) == NULL_TREE)
10171 resdecl = build_decl (RESULT_DECL, 0, TYPE_MAIN_VARIANT (restype));
10172 DECL_ARTIFICIAL (resdecl) = 1;
10173 DECL_IGNORED_P (resdecl) = 1;
10174 DECL_RESULT (decl1) = resdecl;
10176 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
10179 /* Initialize RTL machinery. We cannot do this until
10180 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
10181 even when processing a template; this is how we get
10182 CFUN set up, and our per-function variables initialized.
10183 FIXME factor out the non-RTL stuff. */
10184 bl = current_binding_level;
10185 allocate_struct_function (decl1);
10186 current_binding_level = bl;
10188 /* Even though we're inside a function body, we still don't want to
10189 call expand_expr to calculate the size of a variable-sized array.
10190 We haven't necessarily assigned RTL to all variables yet, so it's
10191 not safe to try to expand expressions involving them. */
10192 cfun->x_dont_save_pending_sizes_p = 1;
10194 /* Start the statement-tree, start the tree now. */
10195 DECL_SAVED_TREE (decl1) = push_stmt_list ();
10197 /* Let the user know we're compiling this function. */
10198 announce_function (decl1);
10200 /* Record the decl so that the function name is defined.
10201 If we already have a decl for this name, and it is a FUNCTION_DECL,
10202 use the old decl. */
10203 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
10205 /* A specialization is not used to guide overload resolution. */
10206 if (!DECL_FUNCTION_MEMBER_P (decl1)
10207 && !(DECL_USE_TEMPLATE (decl1) &&
10208 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
10210 tree olddecl = pushdecl (decl1);
10212 if (olddecl == error_mark_node)
10213 /* If something went wrong when registering the declaration,
10214 use DECL1; we have to have a FUNCTION_DECL to use when
10215 parsing the body of the function. */
10218 /* Otherwise, OLDDECL is either a previous declaration of
10219 the same function or DECL1 itself. */
10224 /* We need to set the DECL_CONTEXT. */
10225 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
10226 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
10227 /* And make sure we have enough default args. */
10228 check_default_args (decl1);
10230 fntype = TREE_TYPE (decl1);
10233 /* Determine the ELF visibility attribute for the function. We must
10234 not do this before calling "pushdecl", as we must allow
10235 "duplicate_decls" to merge any attributes appropriately. */
10236 if (!DECL_CLONED_FUNCTION_P (decl1))
10237 determine_visibility (decl1);
10239 /* Reset these in case the call to pushdecl changed them. */
10240 current_function_decl = decl1;
10241 cfun->decl = decl1;
10243 /* If we are (erroneously) defining a function that we have already
10244 defined before, wipe out what we knew before. */
10245 if (!DECL_PENDING_INLINE_P (decl1))
10246 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
10248 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
10250 /* We know that this was set up by `grokclassfn'. We do not
10251 wait until `store_parm_decls', since evil parse errors may
10252 never get us to that point. Here we keep the consistency
10253 between `current_class_type' and `current_class_ptr'. */
10254 tree t = DECL_ARGUMENTS (decl1);
10256 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
10257 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
10259 cp_function_chain->x_current_class_ref
10260 = build_indirect_ref (t, NULL);
10261 cp_function_chain->x_current_class_ptr = t;
10263 /* Constructors and destructors need to know whether they're "in
10264 charge" of initializing virtual base classes. */
10265 t = TREE_CHAIN (t);
10266 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
10268 current_in_charge_parm = t;
10269 t = TREE_CHAIN (t);
10271 if (DECL_HAS_VTT_PARM_P (decl1))
10273 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
10274 current_vtt_parm = t;
10278 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
10279 /* Implicitly-defined methods (like the
10280 destructor for a class in which no destructor
10281 is explicitly declared) must not be defined
10282 until their definition is needed. So, we
10283 ignore interface specifications for
10284 compiler-generated functions. */
10285 && !DECL_ARTIFICIAL (decl1));
10287 if (DECL_INTERFACE_KNOWN (decl1))
10289 tree ctx = decl_function_context (decl1);
10291 if (DECL_NOT_REALLY_EXTERN (decl1))
10292 DECL_EXTERNAL (decl1) = 0;
10294 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
10295 && TREE_PUBLIC (ctx))
10296 /* This is a function in a local class in an extern inline
10298 comdat_linkage (decl1);
10300 /* If this function belongs to an interface, it is public.
10301 If it belongs to someone else's interface, it is also external.
10302 This only affects inlines and template instantiations. */
10303 else if (!finfo->interface_unknown && honor_interface)
10305 if (DECL_DECLARED_INLINE_P (decl1)
10306 || DECL_TEMPLATE_INSTANTIATION (decl1)
10307 || processing_template_decl)
10309 DECL_EXTERNAL (decl1)
10310 = (finfo->interface_only
10311 || (DECL_DECLARED_INLINE_P (decl1)
10312 && ! flag_implement_inlines
10313 && !DECL_VINDEX (decl1)));
10315 /* For WIN32 we also want to put these in linkonce sections. */
10316 maybe_make_one_only (decl1);
10319 DECL_EXTERNAL (decl1) = 0;
10320 DECL_INTERFACE_KNOWN (decl1) = 1;
10321 /* If this function is in an interface implemented in this file,
10322 make sure that the backend knows to emit this function
10324 if (!DECL_EXTERNAL (decl1))
10325 mark_needed (decl1);
10327 else if (finfo->interface_unknown && finfo->interface_only
10328 && honor_interface)
10330 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
10331 interface, we will have both finfo->interface_unknown and
10332 finfo->interface_only set. In that case, we don't want to
10333 use the normal heuristics because someone will supply a
10334 #pragma implementation elsewhere, and deducing it here would
10335 produce a conflict. */
10336 comdat_linkage (decl1);
10337 DECL_EXTERNAL (decl1) = 0;
10338 DECL_INTERFACE_KNOWN (decl1) = 1;
10339 DECL_DEFER_OUTPUT (decl1) = 1;
10343 /* This is a definition, not a reference.
10344 So clear DECL_EXTERNAL. */
10345 DECL_EXTERNAL (decl1) = 0;
10347 if ((DECL_DECLARED_INLINE_P (decl1)
10348 || DECL_TEMPLATE_INSTANTIATION (decl1))
10349 && ! DECL_INTERFACE_KNOWN (decl1)
10350 /* Don't try to defer nested functions for now. */
10351 && ! decl_function_context (decl1))
10352 DECL_DEFER_OUTPUT (decl1) = 1;
10354 DECL_INTERFACE_KNOWN (decl1) = 1;
10357 begin_scope (sk_function_parms, decl1);
10361 if (DECL_DESTRUCTOR_P (decl1)
10362 || (DECL_CONSTRUCTOR_P (decl1)
10363 && targetm.cxx.cdtor_returns_this ()))
10365 cdtor_label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
10366 DECL_CONTEXT (cdtor_label) = current_function_decl;
10369 start_fname_decls ();
10371 store_parm_decls (current_function_parms);
10375 /* Like start_preparsed_function, except that instead of a
10376 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
10378 Returns 1 on success. If the DECLARATOR is not suitable for a function
10379 (it defines a datum instead), we return 0, which tells
10380 yyparse to report a parse error. */
10383 start_function (cp_decl_specifier_seq *declspecs,
10384 const cp_declarator *declarator,
10389 if (have_extern_spec)
10391 declspecs->storage_class = sc_extern;
10392 /* This should only be done once on the outermost decl. */
10393 have_extern_spec = false;
10396 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
10397 /* If the declarator is not suitable for a function definition,
10398 cause a syntax error. */
10399 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
10402 /* If #pragma weak was used, mark the decl weak now. */
10403 if (global_scope_p (current_binding_level))
10404 maybe_apply_pragma_weak (decl1);
10406 if (DECL_MAIN_P (decl1))
10407 /* main must return int. grokfndecl should have corrected it
10408 (and issued a diagnostic) if the user got it wrong. */
10409 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
10410 integer_type_node));
10412 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
10417 /* Store the parameter declarations into the current function declaration.
10418 This is called after parsing the parameter declarations, before
10419 digesting the body of the function.
10421 Also install to binding contour return value identifier, if any. */
10424 store_parm_decls (tree current_function_parms)
10426 tree fndecl = current_function_decl;
10429 /* This is a chain of any other decls that came in among the parm
10430 declarations. If a parm is declared with enum {foo, bar} x;
10431 then CONST_DECLs for foo and bar are put here. */
10432 tree nonparms = NULL_TREE;
10434 if (current_function_parms)
10436 /* This case is when the function was defined with an ANSI prototype.
10437 The parms already have decls, so we need not do anything here
10438 except record them as in effect
10439 and complain if any redundant old-style parm decls were written. */
10441 tree specparms = current_function_parms;
10444 /* Must clear this because it might contain TYPE_DECLs declared
10446 current_binding_level->names = NULL;
10448 /* If we're doing semantic analysis, then we'll call pushdecl
10449 for each of these. We must do them in reverse order so that
10450 they end in the correct forward order. */
10451 specparms = nreverse (specparms);
10453 for (parm = specparms; parm; parm = next)
10455 next = TREE_CHAIN (parm);
10456 if (TREE_CODE (parm) == PARM_DECL)
10458 if (DECL_NAME (parm) == NULL_TREE
10459 || TREE_CODE (parm) != VOID_TYPE)
10462 error ("parameter %qD declared void", parm);
10466 /* If we find an enum constant or a type tag,
10467 put it aside for the moment. */
10468 TREE_CHAIN (parm) = NULL_TREE;
10469 nonparms = chainon (nonparms, parm);
10473 /* Get the decls in their original chain order and record in the
10474 function. This is all and only the PARM_DECLs that were
10475 pushed into scope by the loop above. */
10476 DECL_ARGUMENTS (fndecl) = getdecls ();
10479 DECL_ARGUMENTS (fndecl) = NULL_TREE;
10481 /* Now store the final chain of decls for the arguments
10482 as the decl-chain of the current lexical scope.
10483 Put the enumerators in as well, at the front so that
10484 DECL_ARGUMENTS is not modified. */
10485 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
10487 /* For a cloned function, we've already got all the code we need;
10488 there's no need to add any extra bits. */
10489 if (!DECL_CLONED_FUNCTION_P (fndecl))
10491 /* Do the starting of the exception specifications, if we have any. */
10492 if (flag_exceptions && !processing_template_decl
10493 && flag_enforce_eh_specs
10494 && TYPE_RAISES_EXCEPTIONS (TREE_TYPE (current_function_decl)))
10495 current_eh_spec_block = begin_eh_spec_block ();
10500 /* We have finished doing semantic analysis on DECL, but have not yet
10501 generated RTL for its body. Save away our current state, so that
10502 when we want to generate RTL later we know what to do. */
10505 save_function_data (tree decl)
10507 struct language_function *f;
10509 /* Save the language-specific per-function data so that we can
10510 get it back when we really expand this function. */
10511 gcc_assert (!DECL_PENDING_INLINE_P (decl));
10514 f = GGC_NEW (struct language_function);
10515 memcpy (f, cp_function_chain, sizeof (struct language_function));
10516 DECL_SAVED_FUNCTION_DATA (decl) = f;
10518 /* Clear out the bits we don't need. */
10519 f->base.x_stmt_tree.x_cur_stmt_list = NULL_TREE;
10520 f->x_named_label_uses = NULL;
10521 f->bindings = NULL;
10522 f->x_local_names = NULL;
10526 /* Set the return value of the constructor (if present). */
10529 finish_constructor_body (void)
10534 if (targetm.cxx.cdtor_returns_this ())
10536 /* Any return from a constructor will end up here. */
10537 add_stmt (build_stmt (LABEL_EXPR, cdtor_label));
10539 val = DECL_ARGUMENTS (current_function_decl);
10540 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
10541 DECL_RESULT (current_function_decl), val);
10542 /* Return the address of the object. */
10543 exprstmt = build_stmt (RETURN_EXPR, val);
10544 add_stmt (exprstmt);
10548 /* Do all the processing for the beginning of a destructor; set up the
10549 vtable pointers and cleanups for bases and members. */
10552 begin_destructor_body (void)
10555 tree compound_stmt;
10557 /* If the dtor is empty, and we know there is not any possible
10558 way we could use any vtable entries, before they are possibly
10559 set by a base class dtor, we don't have to setup the vtables,
10560 as we know that any base class dtor will set up any vtables
10561 it needs. We avoid MI, because one base class dtor can do a
10562 virtual dispatch to an overridden function that would need to
10563 have a non-related vtable set up, we cannot avoid setting up
10564 vtables in that case. We could change this to see if there
10565 is just one vtable.
10567 ??? In the destructor for a class, the vtables are set
10568 appropriately for that class. There will be no non-related
10569 vtables. jason 2001-12-11. */
10570 if_stmt = begin_if_stmt ();
10572 /* If it is not safe to avoid setting up the vtables, then
10573 someone will change the condition to be boolean_true_node.
10574 (Actually, for now, we do not have code to set the condition
10575 appropriately, so we just assume that we always need to
10576 initialize the vtables.) */
10577 finish_if_stmt_cond (boolean_true_node, if_stmt);
10579 compound_stmt = begin_compound_stmt (0);
10581 /* Make all virtual function table pointers in non-virtual base
10582 classes point to CURRENT_CLASS_TYPE's virtual function
10584 initialize_vtbl_ptrs (current_class_ptr);
10586 finish_compound_stmt (compound_stmt);
10587 finish_then_clause (if_stmt);
10588 finish_if_stmt (if_stmt);
10590 /* And insert cleanups for our bases and members so that they
10591 will be properly destroyed if we throw. */
10592 push_base_cleanups ();
10595 /* At the end of every destructor we generate code to delete the object if
10596 necessary. Do that now. */
10599 finish_destructor_body (void)
10603 /* Any return from a destructor will end up here; that way all base
10604 and member cleanups will be run when the function returns. */
10605 add_stmt (build_stmt (LABEL_EXPR, cdtor_label));
10607 /* In a virtual destructor, we must call delete. */
10608 if (DECL_VIRTUAL_P (current_function_decl))
10611 tree virtual_size = cxx_sizeof (current_class_type);
10615 At the point of definition of a virtual destructor (including
10616 an implicit definition), non-placement operator delete shall
10617 be looked up in the scope of the destructor's class and if
10618 found shall be accessible and unambiguous. */
10619 exprstmt = build_op_delete_call
10620 (DELETE_EXPR, current_class_ptr, virtual_size,
10621 /*global_p=*/false, NULL_TREE);
10623 if_stmt = begin_if_stmt ();
10624 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
10625 current_in_charge_parm,
10628 finish_expr_stmt (exprstmt);
10629 finish_then_clause (if_stmt);
10630 finish_if_stmt (if_stmt);
10633 if (targetm.cxx.cdtor_returns_this ())
10637 val = DECL_ARGUMENTS (current_function_decl);
10638 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
10639 DECL_RESULT (current_function_decl), val);
10640 /* Return the address of the object. */
10641 exprstmt = build_stmt (RETURN_EXPR, val);
10642 add_stmt (exprstmt);
10646 /* Do the necessary processing for the beginning of a function body, which
10647 in this case includes member-initializers, but not the catch clauses of
10648 a function-try-block. Currently, this means opening a binding level
10649 for the member-initializers (in a ctor) and member cleanups (in a dtor). */
10652 begin_function_body (void)
10656 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
10659 if (processing_template_decl)
10660 /* Do nothing now. */;
10662 /* Always keep the BLOCK node associated with the outermost pair of
10663 curly braces of a function. These are needed for correct
10664 operation of dwarfout.c. */
10665 keep_next_level (true);
10667 stmt = begin_compound_stmt (BCS_FN_BODY);
10669 if (processing_template_decl)
10670 /* Do nothing now. */;
10671 else if (DECL_DESTRUCTOR_P (current_function_decl))
10672 begin_destructor_body ();
10677 /* Do the processing for the end of a function body. Currently, this means
10678 closing out the cleanups for fully-constructed bases and members, and in
10679 the case of the destructor, deleting the object if desired. Again, this
10680 is only meaningful for [cd]tors, since they are the only functions where
10681 there is a significant distinction between the main body and any
10682 function catch clauses. Handling, say, main() return semantics here
10683 would be wrong, as flowing off the end of a function catch clause for
10684 main() would also need to return 0. */
10687 finish_function_body (tree compstmt)
10689 if (compstmt == NULL_TREE)
10692 /* Close the block. */
10693 finish_compound_stmt (compstmt);
10695 if (processing_template_decl)
10696 /* Do nothing now. */;
10697 else if (DECL_CONSTRUCTOR_P (current_function_decl))
10698 finish_constructor_body ();
10699 else if (DECL_DESTRUCTOR_P (current_function_decl))
10700 finish_destructor_body ();
10703 /* Given a function, returns the BLOCK corresponding to the outermost level
10704 of curly braces, skipping the artificial block created for constructor
10708 outer_curly_brace_block (tree fndecl)
10710 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
10711 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
10712 /* Skip the artificial function body block. */
10713 block = BLOCK_SUBBLOCKS (block);
10717 /* Finish up a function declaration and compile that function
10718 all the way to assembler language output. The free the storage
10719 for the function definition.
10721 FLAGS is a bitwise or of the following values:
10723 We just finished processing the body of an in-class inline
10724 function definition. (This processing will have taken place
10725 after the class definition is complete.) */
10728 finish_function (int flags)
10730 tree fndecl = current_function_decl;
10731 tree fntype, ctype = NULL_TREE;
10732 int inclass_inline = (flags & 2) != 0;
10735 /* When we get some parse errors, we can end up without a
10736 current_function_decl, so cope. */
10737 if (fndecl == NULL_TREE)
10738 return error_mark_node;
10740 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
10741 && DECL_VIRTUAL_P (fndecl)
10742 && !processing_template_decl)
10744 tree fnclass = DECL_CONTEXT (fndecl);
10745 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
10746 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
10749 nested = function_depth > 1;
10750 fntype = TREE_TYPE (fndecl);
10752 /* TREE_READONLY (fndecl) = 1;
10753 This caused &foo to be of type ptr-to-const-function
10754 which then got a warning when stored in a ptr-to-function variable. */
10756 gcc_assert (building_stmt_tree ());
10758 /* For a cloned function, we've already got all the code we need;
10759 there's no need to add any extra bits. */
10760 if (!DECL_CLONED_FUNCTION_P (fndecl))
10762 if (DECL_MAIN_P (current_function_decl))
10766 /* Make it so that `main' always returns 0 by default (or
10769 stmt = finish_return_stmt (integer_one_node);
10771 stmt = finish_return_stmt (integer_zero_node);
10773 /* Hack. We don't want the middle-end to warn that this
10774 return is unreachable, so put the statement on the
10776 #ifdef USE_MAPPED_LOCATION
10777 SET_EXPR_LOCATION (stmt, UNKNOWN_LOCATION);
10779 annotate_with_file_line (stmt, input_filename, 0);
10783 /* Finish dealing with exception specifiers. */
10784 if (flag_exceptions && !processing_template_decl
10785 && flag_enforce_eh_specs
10786 && TYPE_RAISES_EXCEPTIONS (TREE_TYPE (current_function_decl)))
10787 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
10788 (TREE_TYPE (current_function_decl)),
10789 current_eh_spec_block);
10792 /* If we're saving up tree structure, tie off the function now. */
10793 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
10795 finish_fname_decls ();
10797 /* If this function can't throw any exceptions, remember that. */
10798 if (!processing_template_decl
10799 && !cp_function_chain->can_throw
10800 && !flag_non_call_exceptions)
10801 TREE_NOTHROW (fndecl) = 1;
10803 /* This must come after expand_function_end because cleanups might
10804 have declarations (from inline functions) that need to go into
10805 this function's blocks. */
10807 /* If the current binding level isn't the outermost binding level
10808 for this function, either there is a bug, or we have experienced
10809 syntax errors and the statement tree is malformed. */
10810 if (current_binding_level->kind != sk_function_parms)
10812 /* Make sure we have already experienced errors. */
10813 gcc_assert (errorcount);
10815 /* Throw away the broken statement tree and extra binding
10817 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
10819 while (current_binding_level->kind != sk_function_parms)
10821 if (current_binding_level->kind == sk_class)
10822 pop_nested_class ();
10824 poplevel (0, 0, 0);
10827 poplevel (1, 0, 1);
10829 /* Statements should always be full-expressions at the outermost set
10830 of curly braces for a function. */
10831 gcc_assert (stmts_are_full_exprs_p ());
10833 /* Set up the named return value optimization, if we can. Candidate
10834 variables are selected in check_return_value. */
10835 if (current_function_return_value)
10837 tree r = current_function_return_value;
10840 if (r != error_mark_node
10841 /* This is only worth doing for fns that return in memory--and
10842 simpler, since we don't have to worry about promoted modes. */
10843 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
10844 /* Only allow this for variables declared in the outer scope of
10845 the function so we know that their lifetime always ends with a
10846 return; see g++.dg/opt/nrv6.C. We could be more flexible if
10847 we were to do this optimization in tree-ssa. */
10848 && (outer = outer_curly_brace_block (fndecl))
10849 && chain_member (r, BLOCK_VARS (outer)))
10850 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
10852 current_function_return_value = NULL_TREE;
10855 /* Remember that we were in class scope. */
10856 if (current_class_name)
10857 ctype = current_class_type;
10859 /* Must mark the RESULT_DECL as being in this function. */
10860 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
10862 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
10863 to the FUNCTION_DECL node itself. */
10864 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
10866 /* Save away current state, if appropriate. */
10867 if (!processing_template_decl)
10868 save_function_data (fndecl);
10870 /* Complain if there's just no return statement. */
10871 if (warn_return_type
10872 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
10873 && !dependent_type_p (TREE_TYPE (fntype))
10874 && !current_function_returns_value && !current_function_returns_null
10875 /* Don't complain if we abort or throw. */
10876 && !current_function_returns_abnormally
10877 && !DECL_NAME (DECL_RESULT (fndecl))
10878 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
10879 inline function, as we might never be compiled separately. */
10880 && (DECL_INLINE (fndecl) || processing_template_decl)
10881 /* Structor return values (if any) are set by the compiler. */
10882 && !DECL_CONSTRUCTOR_P (fndecl)
10883 && !DECL_DESTRUCTOR_P (fndecl))
10884 warning (0, "no return statement in function returning non-void");
10886 /* Store the end of the function, so that we get good line number
10887 info for the epilogue. */
10888 cfun->function_end_locus = input_location;
10890 /* Genericize before inlining. */
10891 if (!processing_template_decl)
10893 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
10894 cp_genericize (fndecl);
10895 /* Clear out the bits we don't need. */
10896 f->x_current_class_ptr = NULL;
10897 f->x_current_class_ref = NULL;
10898 f->x_eh_spec_block = NULL;
10899 f->x_in_charge_parm = NULL;
10900 f->x_vtt_parm = NULL;
10901 f->x_return_value = NULL;
10902 f->bindings = NULL;
10904 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
10905 c_warn_unused_result (&DECL_SAVED_TREE (fndecl));
10907 /* Clear out the bits we don't need. */
10908 local_names = NULL;
10909 named_label_uses = NULL;
10911 /* We're leaving the context of this function, so zap cfun. It's still in
10912 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
10914 current_function_decl = NULL;
10916 /* If this is an in-class inline definition, we may have to pop the
10917 bindings for the template parameters that we added in
10918 maybe_begin_member_template_processing when start_function was
10920 if (inclass_inline)
10921 maybe_end_member_template_processing ();
10923 /* Leave the scope of the class. */
10925 pop_nested_class ();
10931 /* Let the error reporting routines know that we're outside a
10932 function. For a nested function, this value is used in
10933 cxx_pop_function_context and then reset via pop_function_context. */
10934 current_function_decl = NULL_TREE;
10939 /* Create the FUNCTION_DECL for a function definition.
10940 DECLSPECS and DECLARATOR are the parts of the declaration;
10941 they describe the return type and the name of the function,
10942 but twisted together in a fashion that parallels the syntax of C.
10944 This function creates a binding context for the function body
10945 as well as setting up the FUNCTION_DECL in current_function_decl.
10947 Returns a FUNCTION_DECL on success.
10949 If the DECLARATOR is not suitable for a function (it defines a datum
10950 instead), we return 0, which tells yyparse to report a parse error.
10952 May return void_type_node indicating that this method is actually
10953 a friend. See grokfield for more details.
10955 Came here with a `.pushlevel' .
10957 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
10958 CHANGES TO CODE IN `grokfield'. */
10961 start_method (cp_decl_specifier_seq *declspecs,
10962 const cp_declarator *declarator, tree attrlist)
10964 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
10967 if (fndecl == error_mark_node)
10968 return error_mark_node;
10970 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
10972 error ("invalid member function declaration");
10973 return error_mark_node;
10977 cplus_decl_attributes (&fndecl, attrlist, 0);
10979 /* Pass friends other than inline friend functions back. */
10980 if (fndecl == void_type_node)
10983 if (DECL_IN_AGGR_P (fndecl))
10985 if (DECL_CONTEXT (fndecl)
10986 && TREE_CODE( DECL_CONTEXT (fndecl)) != NAMESPACE_DECL)
10987 error ("%qD is already defined in class %qT", fndecl,
10988 DECL_CONTEXT (fndecl));
10989 return error_mark_node;
10992 check_template_shadow (fndecl);
10994 DECL_DECLARED_INLINE_P (fndecl) = 1;
10995 if (flag_default_inline)
10996 DECL_INLINE (fndecl) = 1;
10998 /* We process method specializations in finish_struct_1. */
10999 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
11001 fndecl = push_template_decl (fndecl);
11002 if (fndecl == error_mark_node)
11006 if (! DECL_FRIEND_P (fndecl))
11008 if (TREE_CHAIN (fndecl))
11010 fndecl = copy_node (fndecl);
11011 TREE_CHAIN (fndecl) = NULL_TREE;
11013 grok_special_member_properties (fndecl);
11016 cp_finish_decl (fndecl, NULL_TREE, NULL_TREE, 0);
11018 /* Make a place for the parms. */
11019 begin_scope (sk_function_parms, fndecl);
11021 DECL_IN_AGGR_P (fndecl) = 1;
11025 /* Go through the motions of finishing a function definition.
11026 We don't compile this method until after the whole class has
11029 FINISH_METHOD must return something that looks as though it
11030 came from GROKFIELD (since we are defining a method, after all).
11032 This is called after parsing the body of the function definition.
11033 STMTS is the chain of statements that makes up the function body.
11035 DECL is the ..._DECL that `start_method' provided. */
11038 finish_method (tree decl)
11040 tree fndecl = decl;
11045 if (decl == void_type_node)
11048 old_initial = DECL_INITIAL (fndecl);
11050 /* Undo the level for the parms (from start_method).
11051 This is like poplevel, but it causes nothing to be
11052 saved. Saving information here confuses symbol-table
11053 output routines. Besides, this information will
11054 be correctly output when this method is actually
11057 /* Clear out the meanings of the local variables of this level;
11058 also record in each decl which block it belongs to. */
11060 for (link = current_binding_level->names; link; link = TREE_CHAIN (link))
11062 if (DECL_NAME (link) != NULL_TREE)
11063 pop_binding (DECL_NAME (link), link);
11064 gcc_assert (TREE_CODE (link) != FUNCTION_DECL);
11065 DECL_CONTEXT (link) = NULL_TREE;
11068 poplevel (0, 0, 0);
11070 DECL_INITIAL (fndecl) = old_initial;
11072 /* We used to check if the context of FNDECL was different from
11073 current_class_type as another way to get inside here. This didn't work
11074 for String.cc in libg++. */
11075 if (DECL_FRIEND_P (fndecl))
11077 VEC_safe_push (tree, gc, CLASSTYPE_INLINE_FRIENDS (current_class_type),
11079 decl = void_type_node;
11086 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
11087 we can lay it out later, when and if its type becomes complete. */
11090 maybe_register_incomplete_var (tree var)
11092 gcc_assert (TREE_CODE (var) == VAR_DECL);
11094 /* Keep track of variables with incomplete types. */
11095 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
11096 && DECL_EXTERNAL (var))
11098 tree inner_type = TREE_TYPE (var);
11100 while (TREE_CODE (inner_type) == ARRAY_TYPE)
11101 inner_type = TREE_TYPE (inner_type);
11102 inner_type = TYPE_MAIN_VARIANT (inner_type);
11104 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
11105 /* RTTI TD entries are created while defining the type_info. */
11106 || (TYPE_LANG_SPECIFIC (inner_type)
11107 && TYPE_BEING_DEFINED (inner_type)))
11108 incomplete_vars = tree_cons (inner_type, var, incomplete_vars);
11112 /* Called when a class type (given by TYPE) is defined. If there are
11113 any existing VAR_DECLs whose type hsa been completed by this
11114 declaration, update them now. */
11117 complete_vars (tree type)
11119 tree *list = &incomplete_vars;
11121 gcc_assert (CLASS_TYPE_P (type));
11124 if (same_type_p (type, TREE_PURPOSE (*list)))
11126 tree var = TREE_VALUE (*list);
11127 tree type = TREE_TYPE (var);
11128 /* Complete the type of the variable. The VAR_DECL itself
11129 will be laid out in expand_expr. */
11130 complete_type (type);
11131 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
11132 /* Remove this entry from the list. */
11133 *list = TREE_CHAIN (*list);
11136 list = &TREE_CHAIN (*list);
11139 /* Check for pending declarations which may have abstract type. */
11140 complete_type_check_abstract (type);
11143 /* If DECL is of a type which needs a cleanup, build that cleanup
11147 cxx_maybe_build_cleanup (tree decl)
11149 tree type = TREE_TYPE (decl);
11151 if (type != error_mark_node && TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
11153 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
11155 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
11156 && CLASSTYPE_VBASECLASSES (type));
11158 if (TREE_CODE (type) == ARRAY_TYPE)
11162 cxx_mark_addressable (decl);
11163 rval = build_unary_op (ADDR_EXPR, decl, 0);
11166 /* Optimize for space over speed here. */
11167 if (!has_vbases || flag_expensive_optimizations)
11168 flags |= LOOKUP_NONVIRTUAL;
11170 rval = build_delete (TREE_TYPE (rval), rval,
11171 sfk_complete_destructor, flags, 0);
11178 /* When a stmt has been parsed, this function is called. */
11185 /* DECL was originally constructed as a non-static member function,
11186 but turned out to be static. Update it accordingly. */
11189 revert_static_member_fn (tree decl)
11192 tree function = TREE_TYPE (decl);
11193 tree args = TYPE_ARG_TYPES (function);
11195 if (cp_type_quals (TREE_TYPE (TREE_VALUE (args)))
11196 != TYPE_UNQUALIFIED)
11197 error ("static member function %q#D declared with type qualifiers", decl);
11199 args = TREE_CHAIN (args);
11200 tmp = build_function_type (TREE_TYPE (function), args);
11201 tmp = build_qualified_type (tmp, cp_type_quals (function));
11202 tmp = build_exception_variant (tmp,
11203 TYPE_RAISES_EXCEPTIONS (function));
11204 TREE_TYPE (decl) = tmp;
11205 if (DECL_ARGUMENTS (decl))
11206 DECL_ARGUMENTS (decl) = TREE_CHAIN (DECL_ARGUMENTS (decl));
11207 DECL_STATIC_FUNCTION_P (decl) = 1;
11210 /* Initialize the variables used during compilation of a C++
11214 cxx_push_function_context (struct function * f)
11216 struct language_function *p = GGC_CNEW (struct language_function);
11219 /* Whenever we start a new function, we destroy temporaries in the
11221 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
11227 if (DECL_SAVED_FUNCTION_DATA (fn))
11229 /* If we already parsed this function, and we're just expanding it
11230 now, restore saved state. */
11231 *cp_function_chain = *DECL_SAVED_FUNCTION_DATA (fn);
11233 /* We don't need the saved data anymore. Unless this is an inline
11234 function; we need the named return value info for
11235 declare_return_variable. */
11236 if (! DECL_INLINE (fn))
11237 DECL_SAVED_FUNCTION_DATA (fn) = NULL;
11242 /* Free the language-specific parts of F, now that we've finished
11243 compiling the function. */
11246 cxx_pop_function_context (struct function * f)
11251 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
11252 one of the language-independent trees. */
11254 enum cp_tree_node_structure_enum
11255 cp_tree_node_structure (union lang_tree_node * t)
11257 switch (TREE_CODE (&t->generic))
11259 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
11260 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
11261 case OVERLOAD: return TS_CP_OVERLOAD;
11262 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
11263 case TINST_LEVEL: return TS_CP_TINST_LEVEL;
11264 case PTRMEM_CST: return TS_CP_PTRMEM;
11265 case BASELINK: return TS_CP_BASELINK;
11266 default: return TS_CP_GENERIC;
11270 /* Build the void_list_node (void_type_node having been created). */
11272 build_void_list_node (void)
11274 tree t = build_tree_list (NULL_TREE, void_type_node);
11279 cp_missing_noreturn_ok_p (tree decl)
11281 /* A missing noreturn is ok for the `main' function. */
11282 return DECL_MAIN_P (decl);
11285 /* Return the COMDAT group into which DECL should be placed. */
11288 cxx_comdat_group (tree decl)
11292 /* Virtual tables, construction virtual tables, and virtual table
11293 tables all go in a single COMDAT group, named after the primary
11295 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
11296 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
11297 /* For all other DECLs, the COMDAT group is the mangled name of the
11298 declaration itself. */
11301 while (DECL_THUNK_P (decl))
11303 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
11304 into the same section as the target function. In that case
11305 we must return target's name. */
11306 tree target = THUNK_TARGET (decl);
11307 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
11308 && DECL_SECTION_NAME (target) != NULL
11309 && DECL_ONE_ONLY (target))
11314 name = DECL_ASSEMBLER_NAME (decl);
11317 return IDENTIFIER_POINTER (name);
11320 #include "gt-cp-decl.h"