1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
4 Contributed by Michael Tiemann (tiemann@cygnus.com)
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2, or (at your option)
13 GCC is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING. If not, write to
20 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
21 Boston, MA 02110-1301, USA. */
24 /* Process declarations and symbol lookup for C++ front end.
25 Also constructs types; the standard scalar types at initialization,
26 and structure, union, array and enum types when they are declared. */
28 /* ??? not all decl nodes are given the most useful possible
29 line numbers. For example, the CONST_DECLs for enum values. */
33 #include "coretypes.h"
40 #include "tree-inline.h"
50 #include "diagnostic.h"
53 #include "tree-flow.h"
55 static tree grokparms (cp_parameter_declarator *, tree *);
56 static const char *redeclaration_error_message (tree, tree);
58 static int decl_jump_unsafe (tree);
59 static void require_complete_types_for_parms (tree);
60 static int ambi_op_p (enum tree_code);
61 static int unary_op_p (enum tree_code);
62 static void push_local_name (tree);
63 static tree grok_reference_init (tree, tree, tree, tree *);
64 static tree grokvardecl (tree, tree, const cp_decl_specifier_seq *,
66 static void record_unknown_type (tree, const char *);
67 static tree builtin_function_1 (const char *, tree, tree,
68 enum built_in_function code,
69 enum built_in_class cl, const char *,
71 static tree build_library_fn_1 (tree, enum tree_code, tree);
72 static int member_function_or_else (tree, tree, enum overload_flags);
73 static void bad_specifiers (tree, const char *, int, int, int, int,
75 static void check_for_uninitialized_const_var (tree);
76 static hashval_t typename_hash (const void *);
77 static int typename_compare (const void *, const void *);
78 static tree local_variable_p_walkfn (tree *, int *, void *);
79 static tree record_builtin_java_type (const char *, int);
80 static const char *tag_name (enum tag_types);
81 static tree lookup_and_check_tag (enum tag_types, tree, tag_scope, bool);
82 static int walk_namespaces_r (tree, walk_namespaces_fn, void *);
83 static tree make_label_decl (tree, int);
84 static void use_label (tree);
85 static void check_previous_goto_1 (tree, struct cp_binding_level *, tree,
87 static void check_previous_goto (struct named_label_use_list *);
88 static void check_switch_goto (struct cp_binding_level *);
89 static void check_previous_gotos (tree);
90 static void pop_label (tree, tree);
91 static void pop_labels (tree);
92 static void maybe_deduce_size_from_array_init (tree, tree);
93 static void layout_var_decl (tree);
94 static void maybe_commonize_var (tree);
95 static tree check_initializer (tree, tree, int, tree *);
96 static void make_rtl_for_nonlocal_decl (tree, tree, const char *);
97 static void save_function_data (tree);
98 static void check_function_type (tree, tree);
99 static void finish_constructor_body (void);
100 static void begin_destructor_body (void);
101 static void finish_destructor_body (void);
102 static tree create_array_type_for_decl (tree, tree, tree);
103 static tree get_atexit_node (void);
104 static tree get_dso_handle_node (void);
105 static tree start_cleanup_fn (void);
106 static void end_cleanup_fn (void);
107 static tree cp_make_fname_decl (tree, int);
108 static void initialize_predefined_identifiers (void);
109 static tree check_special_function_return_type
110 (special_function_kind, tree, tree);
111 static tree push_cp_library_fn (enum tree_code, tree);
112 static tree build_cp_library_fn (tree, enum tree_code, tree);
113 static void store_parm_decls (tree);
114 static void initialize_local_var (tree, tree);
115 static void expand_static_init (tree, tree);
116 static tree next_initializable_field (tree);
117 static tree reshape_init (tree, tree);
119 /* Erroneous argument lists can use this *IFF* they do not modify it. */
120 tree error_mark_list;
122 /* The following symbols are subsumed in the cp_global_trees array, and
123 listed here individually for documentation purposes.
126 tree wchar_decl_node;
128 tree vtable_entry_type;
129 tree delta_type_node;
130 tree __t_desc_type_node;
132 tree class_type_node;
133 tree unknown_type_node;
135 Array type `vtable_entry_type[]'
138 tree vtbl_ptr_type_node;
145 A FUNCTION_DECL which can call `abort'. Not necessarily the
146 one that the user will declare, but sufficient to be called
147 by routines that want to abort the program.
151 The FUNCTION_DECL for the default `::operator delete'.
153 tree global_delete_fndecl;
156 tree type_info_type_node, tinfo_decl_id, tinfo_decl_type;
161 tree cp_global_trees[CPTI_MAX];
163 /* Indicates that there is a type value in some namespace, although
164 that is not necessarily in scope at the moment. */
166 tree global_type_node;
168 /* The node that holds the "name" of the global scope. */
169 tree global_scope_name;
171 /* Used only for jumps to as-yet undefined labels, since jumps to
172 defined labels can have their validity checked immediately. */
174 struct named_label_use_list GTY(())
176 struct cp_binding_level *binding_level;
179 location_t o_goto_locus;
180 struct named_label_use_list *next;
183 #define named_label_uses cp_function_chain->x_named_label_uses
185 #define local_names cp_function_chain->x_local_names
187 /* A list of objects which have constructors or destructors
188 which reside in the global scope. The decl is stored in
189 the TREE_VALUE slot and the initializer is stored
190 in the TREE_PURPOSE slot. */
191 tree static_aggregates;
195 /* A node for the integer constants 2, and 3. */
197 tree integer_two_node, integer_three_node;
199 /* A list of all LABEL_DECLs in the function that have names. Here so
200 we can clear out their names' definitions at the end of the
201 function, and so we can check the validity of jumps to these labels. */
203 struct named_label_list GTY(())
205 struct cp_binding_level *binding_level;
210 struct named_label_list *next;
211 unsigned int in_try_scope : 1;
212 unsigned int in_catch_scope : 1;
215 #define named_labels cp_function_chain->x_named_labels
217 /* The number of function bodies which we are currently processing.
218 (Zero if we are at namespace scope, one inside the body of a
219 function, two inside the body of a function in a local class, etc.) */
222 /* States indicating how grokdeclarator() should handle declspecs marked
223 with __attribute__((deprecated)). An object declared as
224 __attribute__((deprecated)) suppresses warnings of uses of other
227 enum deprecated_states {
232 static enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
234 /* True if a declaration with an `extern' linkage specifier is being
236 bool have_extern_spec;
239 /* A TREE_LIST of VAR_DECLs. The TREE_PURPOSE is a RECORD_TYPE or
240 UNION_TYPE; the TREE_VALUE is a VAR_DECL with that type. At the
241 time the VAR_DECL was declared, the type was incomplete. */
243 static GTY(()) tree incomplete_vars;
245 /* Returns the kind of template specialization we are currently
246 processing, given that it's declaration contained N_CLASS_SCOPES
247 explicit scope qualifications. */
250 current_tmpl_spec_kind (int n_class_scopes)
252 int n_template_parm_scopes = 0;
253 int seen_specialization_p = 0;
254 int innermost_specialization_p = 0;
255 struct cp_binding_level *b;
257 /* Scan through the template parameter scopes. */
258 for (b = current_binding_level;
259 b->kind == sk_template_parms;
262 /* If we see a specialization scope inside a parameter scope,
263 then something is wrong. That corresponds to a declaration
266 template <class T> template <> ...
268 which is always invalid since [temp.expl.spec] forbids the
269 specialization of a class member template if the enclosing
270 class templates are not explicitly specialized as well. */
271 if (b->explicit_spec_p)
273 if (n_template_parm_scopes == 0)
274 innermost_specialization_p = 1;
276 seen_specialization_p = 1;
278 else if (seen_specialization_p == 1)
279 return tsk_invalid_member_spec;
281 ++n_template_parm_scopes;
284 /* Handle explicit instantiations. */
285 if (processing_explicit_instantiation)
287 if (n_template_parm_scopes != 0)
288 /* We've seen a template parameter list during an explicit
289 instantiation. For example:
291 template <class T> template void f(int);
293 This is erroneous. */
294 return tsk_invalid_expl_inst;
296 return tsk_expl_inst;
299 if (n_template_parm_scopes < n_class_scopes)
300 /* We've not seen enough template headers to match all the
301 specialized classes present. For example:
303 template <class T> void R<T>::S<T>::f(int);
305 This is invalid; there needs to be one set of template
306 parameters for each class. */
307 return tsk_insufficient_parms;
308 else if (n_template_parm_scopes == n_class_scopes)
309 /* We're processing a non-template declaration (even though it may
310 be a member of a template class.) For example:
312 template <class T> void S<T>::f(int);
314 The `class T' maches the `S<T>', leaving no template headers
315 corresponding to the `f'. */
317 else if (n_template_parm_scopes > n_class_scopes + 1)
318 /* We've got too many template headers. For example:
320 template <> template <class T> void f (T);
322 There need to be more enclosing classes. */
323 return tsk_excessive_parms;
325 /* This must be a template. It's of the form:
327 template <class T> template <class U> void S<T>::f(U);
329 This is a specialization if the innermost level was a
330 specialization; otherwise it's just a definition of the
332 return innermost_specialization_p ? tsk_expl_spec : tsk_template;
335 /* Exit the current scope. */
343 /* When a label goes out of scope, check to see if that label was used
344 in a valid manner, and issue any appropriate warnings or errors. */
347 pop_label (tree label, tree old_value)
349 if (!processing_template_decl)
351 if (DECL_INITIAL (label) == NULL_TREE)
355 error ("label %q+D used but not defined", label);
356 #ifdef USE_MAPPED_LOCATION
357 location = input_location; /* FIXME want (input_filename, (line)0) */
359 location.file = input_filename;
362 /* Avoid crashing later. */
363 define_label (location, DECL_NAME (label));
365 else if (warn_unused_label && !TREE_USED (label))
366 warning (0, "label %q+D defined but not used", label);
369 SET_IDENTIFIER_LABEL_VALUE (DECL_NAME (label), old_value);
372 /* At the end of a function, all labels declared within the function
373 go out of scope. BLOCK is the top-level block for the
377 pop_labels (tree block)
379 struct named_label_list *link;
381 /* Clear out the definitions of all label names, since their scopes
383 for (link = named_labels; link; link = link->next)
385 pop_label (link->label_decl, link->old_value);
386 /* Put the labels into the "variables" of the top-level block,
387 so debugger can see them. */
388 TREE_CHAIN (link->label_decl) = BLOCK_VARS (block);
389 BLOCK_VARS (block) = link->label_decl;
395 /* The following two routines are used to interface to Objective-C++.
396 The binding level is purposely treated as an opaque type. */
399 objc_get_current_scope (void)
401 return current_binding_level;
404 /* The following routine is used by the NeXT-style SJLJ exceptions;
405 variables get marked 'volatile' so as to not be clobbered by
406 _setjmp()/_longjmp() calls. All variables in the current scope,
407 as well as parent scopes up to (but not including) ENCLOSING_BLK
408 shall be thusly marked. */
411 objc_mark_locals_volatile (void *enclosing_blk)
413 struct cp_binding_level *scope;
415 for (scope = current_binding_level;
416 scope && scope != enclosing_blk;
417 scope = scope->level_chain)
421 for (decl = scope->names; decl; decl = TREE_CHAIN (decl))
422 objc_volatilize_decl (decl);
424 /* Do not climb up past the current function. */
425 if (scope->kind == sk_function_parms)
430 /* Exit a binding level.
431 Pop the level off, and restore the state of the identifier-decl mappings
432 that were in effect when this level was entered.
434 If KEEP == 1, this level had explicit declarations, so
435 and create a "block" (a BLOCK node) for the level
436 to record its declarations and subblocks for symbol table output.
438 If FUNCTIONBODY is nonzero, this level is the body of a function,
439 so create a block as if KEEP were set and also clear out all
442 If REVERSE is nonzero, reverse the order of decls before putting
443 them into the BLOCK. */
446 poplevel (int keep, int reverse, int functionbody)
449 /* The chain of decls was accumulated in reverse order.
450 Put it into forward order, just for cleanliness. */
452 int tmp = functionbody;
453 int real_functionbody;
457 int leaving_for_scope;
460 timevar_push (TV_NAME_LOOKUP);
465 gcc_assert (current_binding_level->kind != sk_class);
467 real_functionbody = (current_binding_level->kind == sk_cleanup
468 ? ((functionbody = 0), tmp) : functionbody);
469 subblocks = functionbody >= 0 ? current_binding_level->blocks : 0;
471 gcc_assert (!VEC_length(cp_class_binding,
472 current_binding_level->class_shadowed));
474 /* We used to use KEEP == 2 to indicate that the new block should go
475 at the beginning of the list of blocks at this binding level,
476 rather than the end. This hack is no longer used. */
477 gcc_assert (keep == 0 || keep == 1);
479 if (current_binding_level->keep)
482 /* Any uses of undefined labels, and any defined labels, now operate
483 under constraints of next binding contour. */
484 if (cfun && !functionbody)
486 struct cp_binding_level *level_chain;
487 level_chain = current_binding_level->level_chain;
490 struct named_label_use_list *uses;
491 struct named_label_list *labels;
492 for (labels = named_labels; labels; labels = labels->next)
493 if (labels->binding_level == current_binding_level)
496 if (current_binding_level->kind == sk_try)
497 labels->in_try_scope = 1;
498 if (current_binding_level->kind == sk_catch)
499 labels->in_catch_scope = 1;
500 for (decl = labels->names_in_scope; decl;
501 decl = TREE_CHAIN (decl))
502 if (decl_jump_unsafe (decl))
503 labels->bad_decls = tree_cons (NULL_TREE, decl,
505 labels->binding_level = level_chain;
506 labels->names_in_scope = level_chain->names;
509 for (uses = named_label_uses; uses; uses = uses->next)
510 if (uses->binding_level == current_binding_level)
512 uses->binding_level = level_chain;
513 uses->names_in_scope = level_chain->names;
518 /* Get the decls in the order they were written.
519 Usually current_binding_level->names is in reverse order.
520 But parameter decls were previously put in forward order. */
523 current_binding_level->names
524 = decls = nreverse (current_binding_level->names);
526 decls = current_binding_level->names;
528 /* If there were any declarations or structure tags in that level,
529 or if this level is a function body,
530 create a BLOCK to record them for the life of this function. */
532 if (keep == 1 || functionbody)
533 block = make_node (BLOCK);
534 if (block != NULL_TREE)
536 BLOCK_VARS (block) = decls;
537 BLOCK_SUBBLOCKS (block) = subblocks;
540 /* In each subblock, record that this is its superior. */
542 for (link = subblocks; link; link = TREE_CHAIN (link))
543 BLOCK_SUPERCONTEXT (link) = block;
545 /* We still support the old for-scope rules, whereby the variables
546 in a for-init statement were in scope after the for-statement
547 ended. We only use the new rules if flag_new_for_scope is
550 = current_binding_level->kind == sk_for && flag_new_for_scope == 1;
552 /* Before we remove the declarations first check for unused variables. */
553 if (warn_unused_variable
554 && !processing_template_decl)
555 for (decl = getdecls (); decl; decl = TREE_CHAIN (decl))
556 if (TREE_CODE (decl) == VAR_DECL
557 && ! TREE_USED (decl)
558 && ! DECL_IN_SYSTEM_HEADER (decl)
559 && DECL_NAME (decl) && ! DECL_ARTIFICIAL (decl))
560 warning (0, "unused variable %q+D", decl);
562 /* Remove declarations for all the DECLs in this level. */
563 for (link = decls; link; link = TREE_CHAIN (link))
565 if (leaving_for_scope && TREE_CODE (link) == VAR_DECL
568 tree name = DECL_NAME (link);
572 ob = outer_binding (name,
573 IDENTIFIER_BINDING (name),
576 ns_binding = IDENTIFIER_NAMESPACE_VALUE (name);
578 ns_binding = NULL_TREE;
580 if (ob && ob->scope == current_binding_level->level_chain)
581 /* We have something like:
586 and we are leaving the `for' scope. There's no reason to
587 keep the binding of the inner `i' in this case. */
588 pop_binding (name, link);
589 else if ((ob && (TREE_CODE (ob->value) == TYPE_DECL))
590 || (ns_binding && TREE_CODE (ns_binding) == TYPE_DECL))
591 /* Here, we have something like:
599 We must pop the for-scope binding so we know what's a
600 type and what isn't. */
601 pop_binding (name, link);
604 /* Mark this VAR_DECL as dead so that we can tell we left it
605 there only for backward compatibility. */
606 DECL_DEAD_FOR_LOCAL (link) = 1;
608 /* Keep track of what should have happened when we
609 popped the binding. */
612 SET_DECL_SHADOWED_FOR_VAR (link, ob->value);
613 DECL_HAS_SHADOWED_FOR_VAR_P (link) = 1;
616 /* Add it to the list of dead variables in the next
617 outermost binding to that we can remove these when we
618 leave that binding. */
619 current_binding_level->level_chain->dead_vars_from_for
620 = tree_cons (NULL_TREE, link,
621 current_binding_level->level_chain->
624 /* Although we don't pop the cxx_binding, we do clear
625 its SCOPE since the scope is going away now. */
626 IDENTIFIER_BINDING (name)->scope
627 = current_binding_level->level_chain;
634 /* Remove the binding. */
637 if (TREE_CODE (decl) == TREE_LIST)
638 decl = TREE_VALUE (decl);
641 if (TREE_CODE (name) == OVERLOAD)
642 name = OVL_FUNCTION (name);
644 gcc_assert (DECL_P (name));
645 pop_binding (DECL_NAME (name), decl);
649 /* Remove declarations for any `for' variables from inner scopes
650 that we kept around. */
651 for (link = current_binding_level->dead_vars_from_for;
652 link; link = TREE_CHAIN (link))
653 pop_binding (DECL_NAME (TREE_VALUE (link)), TREE_VALUE (link));
655 /* Restore the IDENTIFIER_TYPE_VALUEs. */
656 for (link = current_binding_level->type_shadowed;
657 link; link = TREE_CHAIN (link))
658 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (link), TREE_VALUE (link));
660 /* Restore the IDENTIFIER_LABEL_VALUEs for local labels. */
661 for (link = current_binding_level->shadowed_labels;
663 link = TREE_CHAIN (link))
664 pop_label (TREE_VALUE (link), TREE_PURPOSE (link));
666 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
667 list if a `using' declaration put them there. The debugging
668 back-ends won't understand OVERLOAD, so we remove them here.
669 Because the BLOCK_VARS are (temporarily) shared with
670 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
671 popped all the bindings. */
676 for (d = &BLOCK_VARS (block); *d; )
678 if (TREE_CODE (*d) == TREE_LIST)
679 *d = TREE_CHAIN (*d);
681 d = &TREE_CHAIN (*d);
685 /* If the level being exited is the top level of a function,
686 check over all the labels. */
689 /* Since this is the top level block of a function, the vars are
690 the function's parameters. Don't leave them in the BLOCK
691 because they are found in the FUNCTION_DECL instead. */
692 BLOCK_VARS (block) = 0;
696 kind = current_binding_level->kind;
697 if (kind == sk_cleanup)
701 /* If this is a temporary binding created for a cleanup, then we'll
702 have pushed a statement list level. Pop that, create a new
703 BIND_EXPR for the block, and insert it into the stream. */
704 stmt = pop_stmt_list (current_binding_level->statement_list);
705 stmt = c_build_bind_expr (block, stmt);
711 DECL_INITIAL (current_function_decl) = block;
713 current_binding_level->blocks
714 = chainon (current_binding_level->blocks, block);
716 /* If we did not make a block for the level just exited,
717 any blocks made for inner levels
718 (since they cannot be recorded as subblocks in that level)
719 must be carried forward so they will later become subblocks
720 of something else. */
722 current_binding_level->blocks
723 = chainon (current_binding_level->blocks, subblocks);
725 /* Each and every BLOCK node created here in `poplevel' is important
726 (e.g. for proper debugging information) so if we created one
727 earlier, mark it as "used". */
729 TREE_USED (block) = 1;
731 /* All temporary bindings created for cleanups are popped silently. */
732 if (kind == sk_cleanup)
735 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, block);
738 /* Insert BLOCK at the end of the list of subblocks of the
739 current binding level. This is used when a BIND_EXPR is expanded,
740 to handle the BLOCK node inside the BIND_EXPR. */
743 insert_block (tree block)
745 TREE_USED (block) = 1;
746 current_binding_level->blocks
747 = chainon (current_binding_level->blocks, block);
750 /* Walk all the namespaces contained NAMESPACE, including NAMESPACE
751 itself, calling F for each. The DATA is passed to F as well. */
754 walk_namespaces_r (tree namespace, walk_namespaces_fn f, void* data)
757 tree current = NAMESPACE_LEVEL (namespace)->namespaces;
759 result |= (*f) (namespace, data);
761 for (; current; current = TREE_CHAIN (current))
762 result |= walk_namespaces_r (current, f, data);
767 /* Walk all the namespaces, calling F for each. The DATA is passed to
771 walk_namespaces (walk_namespaces_fn f, void* data)
773 return walk_namespaces_r (global_namespace, f, data);
776 /* Call wrapup_globals_declarations for the globals in NAMESPACE. If
777 DATA is non-NULL, this is the last time we will call
778 wrapup_global_declarations for this NAMESPACE. */
781 wrapup_globals_for_namespace (tree namespace, void* data)
783 struct cp_binding_level *level = NAMESPACE_LEVEL (namespace);
784 VEC(tree,gc) *statics = level->static_decls;
785 tree *vec = VEC_address (tree, statics);
786 int len = VEC_length (tree, statics);
787 int last_time = (data != 0);
791 check_global_declarations (vec, len);
792 emit_debug_global_declarations (vec, len);
796 /* Write out any globals that need to be output. */
797 return wrapup_global_declarations (vec, len);
801 /* In C++, you don't have to write `struct S' to refer to `S'; you
802 can just use `S'. We accomplish this by creating a TYPE_DECL as
803 if the user had written `typedef struct S S'. Create and return
804 the TYPE_DECL for TYPE. */
807 create_implicit_typedef (tree name, tree type)
811 decl = build_decl (TYPE_DECL, name, type);
812 DECL_ARTIFICIAL (decl) = 1;
813 /* There are other implicit type declarations, like the one *within*
814 a class that allows you to write `S::S'. We must distinguish
816 SET_DECL_IMPLICIT_TYPEDEF_P (decl);
817 TYPE_NAME (type) = decl;
822 /* Remember a local name for name-mangling purposes. */
825 push_local_name (tree decl)
830 timevar_push (TV_NAME_LOOKUP);
832 name = DECL_NAME (decl);
834 nelts = VEC_length (tree, local_names);
835 for (i = 0; i < nelts; i++)
837 t = VEC_index (tree, local_names, i);
838 if (DECL_NAME (t) == name)
840 if (!DECL_LANG_SPECIFIC (decl))
841 retrofit_lang_decl (decl);
842 DECL_LANG_SPECIFIC (decl)->decl_flags.u2sel = 1;
843 if (DECL_LANG_SPECIFIC (t))
844 DECL_DISCRIMINATOR (decl) = DECL_DISCRIMINATOR (t) + 1;
846 DECL_DISCRIMINATOR (decl) = 1;
848 VEC_replace (tree, local_names, i, decl);
849 timevar_pop (TV_NAME_LOOKUP);
854 VEC_safe_push (tree, gc, local_names, decl);
855 timevar_pop (TV_NAME_LOOKUP);
858 /* Subroutine of duplicate_decls: return truthvalue of whether
859 or not types of these decls match.
861 For C++, we must compare the parameter list so that `int' can match
862 `int&' in a parameter position, but `int&' is not confused with
866 decls_match (tree newdecl, tree olddecl)
870 if (newdecl == olddecl)
873 if (TREE_CODE (newdecl) != TREE_CODE (olddecl))
874 /* If the two DECLs are not even the same kind of thing, we're not
875 interested in their types. */
878 if (TREE_CODE (newdecl) == FUNCTION_DECL)
880 tree f1 = TREE_TYPE (newdecl);
881 tree f2 = TREE_TYPE (olddecl);
882 tree p1 = TYPE_ARG_TYPES (f1);
883 tree p2 = TYPE_ARG_TYPES (f2);
885 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
886 && ! (DECL_EXTERN_C_P (newdecl)
887 && DECL_EXTERN_C_P (olddecl)))
890 if (TREE_CODE (f1) != TREE_CODE (f2))
893 if (same_type_p (TREE_TYPE (f1), TREE_TYPE (f2)))
895 if (p2 == NULL_TREE && DECL_EXTERN_C_P (olddecl)
896 && (DECL_BUILT_IN (olddecl)
897 #ifndef NO_IMPLICIT_EXTERN_C
898 || (DECL_IN_SYSTEM_HEADER (newdecl) && !DECL_CLASS_SCOPE_P (newdecl))
899 || (DECL_IN_SYSTEM_HEADER (olddecl) && !DECL_CLASS_SCOPE_P (olddecl))
903 types_match = self_promoting_args_p (p1);
904 if (p1 == void_list_node)
905 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
907 #ifndef NO_IMPLICIT_EXTERN_C
908 else if (p1 == NULL_TREE
909 && (DECL_EXTERN_C_P (olddecl)
910 && DECL_IN_SYSTEM_HEADER (olddecl)
911 && !DECL_CLASS_SCOPE_P (olddecl))
912 && (DECL_EXTERN_C_P (newdecl)
913 && DECL_IN_SYSTEM_HEADER (newdecl)
914 && !DECL_CLASS_SCOPE_P (newdecl)))
916 types_match = self_promoting_args_p (p2);
917 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
921 types_match = compparms (p1, p2);
926 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
928 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl))
929 != TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)))
932 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
933 DECL_TEMPLATE_PARMS (olddecl)))
936 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
937 types_match = same_type_p (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl)),
938 TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl)));
940 types_match = decls_match (DECL_TEMPLATE_RESULT (olddecl),
941 DECL_TEMPLATE_RESULT (newdecl));
945 /* Need to check scope for variable declaration (VAR_DECL).
946 For typedef (TYPE_DECL), scope is ignored. */
947 if (TREE_CODE (newdecl) == VAR_DECL
948 && CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
951 if (TREE_TYPE (newdecl) == error_mark_node)
952 types_match = TREE_TYPE (olddecl) == error_mark_node;
953 else if (TREE_TYPE (olddecl) == NULL_TREE)
954 types_match = TREE_TYPE (newdecl) == NULL_TREE;
955 else if (TREE_TYPE (newdecl) == NULL_TREE)
958 types_match = comptypes (TREE_TYPE (newdecl),
960 COMPARE_REDECLARATION);
966 /* If NEWDECL is `static' and an `extern' was seen previously,
967 warn about it. OLDDECL is the previous declaration.
969 Note that this does not apply to the C++ case of declaring
970 a variable `extern const' and then later `const'.
972 Don't complain about built-in functions, since they are beyond
973 the user's control. */
976 warn_extern_redeclared_static (tree newdecl, tree olddecl)
980 if (TREE_CODE (newdecl) == TYPE_DECL
981 || TREE_CODE (newdecl) == TEMPLATE_DECL
982 || TREE_CODE (newdecl) == CONST_DECL
983 || TREE_CODE (newdecl) == NAMESPACE_DECL)
986 /* Don't get confused by static member functions; that's a different
988 if (TREE_CODE (newdecl) == FUNCTION_DECL
989 && DECL_STATIC_FUNCTION_P (newdecl))
992 /* If the old declaration was `static', or the new one isn't, then
993 then everything is OK. */
994 if (DECL_THIS_STATIC (olddecl) || !DECL_THIS_STATIC (newdecl))
997 /* It's OK to declare a builtin function as `static'. */
998 if (TREE_CODE (olddecl) == FUNCTION_DECL
999 && DECL_ARTIFICIAL (olddecl))
1002 name = DECL_ASSEMBLER_NAME (newdecl);
1003 pedwarn ("%qD was declared %<extern%> and later %<static%>", newdecl);
1004 pedwarn ("previous declaration of %q+D", olddecl);
1007 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1008 If the redeclaration is invalid, a diagnostic is issued, and the
1009 error_mark_node is returned. Otherwise, OLDDECL is returned.
1011 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1014 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1017 duplicate_decls (tree newdecl, tree olddecl, bool newdecl_is_friend)
1019 unsigned olddecl_uid = DECL_UID (olddecl);
1020 int olddecl_friend = 0, types_match = 0, hidden_friend = 0;
1021 int new_defines_function = 0;
1023 if (newdecl == olddecl)
1026 types_match = decls_match (newdecl, olddecl);
1028 /* If either the type of the new decl or the type of the old decl is an
1029 error_mark_node, then that implies that we have already issued an
1030 error (earlier) for some bogus type specification, and in that case,
1031 it is rather pointless to harass the user with yet more error message
1032 about the same declaration, so just pretend the types match here. */
1033 if (TREE_TYPE (newdecl) == error_mark_node
1034 || TREE_TYPE (olddecl) == error_mark_node)
1037 if (DECL_P (olddecl)
1038 && TREE_CODE (newdecl) == FUNCTION_DECL
1039 && TREE_CODE (olddecl) == FUNCTION_DECL
1040 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1042 if (DECL_DECLARED_INLINE_P (newdecl)
1043 && DECL_UNINLINABLE (newdecl)
1044 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1045 /* Already warned elsewhere. */;
1046 else if (DECL_DECLARED_INLINE_P (olddecl)
1047 && DECL_UNINLINABLE (olddecl)
1048 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1049 /* Already warned. */;
1050 else if (DECL_DECLARED_INLINE_P (newdecl)
1051 && DECL_UNINLINABLE (olddecl)
1052 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1054 warning (OPT_Wattributes, "function %q+D redeclared as inline",
1056 warning (OPT_Wattributes, "previous declaration of %q+D "
1057 "with attribute noinline", olddecl);
1059 else if (DECL_DECLARED_INLINE_P (olddecl)
1060 && DECL_UNINLINABLE (newdecl)
1061 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1063 warning (OPT_Wattributes, "function %q+D redeclared with "
1064 "attribute noinline", newdecl);
1065 warning (OPT_Wattributes, "previous declaration of %q+D was inline",
1070 /* Check for redeclaration and other discrepancies. */
1071 if (TREE_CODE (olddecl) == FUNCTION_DECL
1072 && DECL_ARTIFICIAL (olddecl))
1074 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl));
1075 if (TREE_CODE (newdecl) != FUNCTION_DECL)
1077 /* Avoid warnings redeclaring built-ins which have not been
1078 explicitly declared. */
1079 if (DECL_ANTICIPATED (olddecl))
1082 /* If you declare a built-in or predefined function name as static,
1083 the old definition is overridden, but optionally warn this was a
1084 bad choice of name. */
1085 if (! TREE_PUBLIC (newdecl))
1088 warning (0, "shadowing %s function %q#D",
1089 DECL_BUILT_IN (olddecl) ? "built-in" : "library",
1091 /* Discard the old built-in function. */
1094 /* If the built-in is not ansi, then programs can override
1095 it even globally without an error. */
1096 else if (! DECL_BUILT_IN (olddecl))
1097 warning (0, "library function %q#D redeclared as non-function %q#D",
1101 error ("declaration of %q#D", newdecl);
1102 error ("conflicts with built-in declaration %q#D",
1107 else if (!types_match)
1109 /* Avoid warnings redeclaring built-ins which have not been
1110 explicitly declared. */
1111 if (DECL_ANTICIPATED (olddecl))
1113 /* Deal with fileptr_type_node. FILE type is not known
1114 at the time we create the builtins. */
1117 for (t1 = TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1118 t2 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1120 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1123 else if (TREE_VALUE (t2) == fileptr_type_node)
1125 tree t = TREE_VALUE (t1);
1127 if (TREE_CODE (t) == POINTER_TYPE
1128 && TYPE_NAME (TREE_TYPE (t))
1129 && DECL_NAME (TYPE_NAME (TREE_TYPE (t)))
1130 == get_identifier ("FILE")
1131 && compparms (TREE_CHAIN (t1), TREE_CHAIN (t2)))
1133 tree oldargs = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1135 TYPE_ARG_TYPES (TREE_TYPE (olddecl))
1136 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1137 types_match = decls_match (newdecl, olddecl);
1139 return duplicate_decls (newdecl, olddecl,
1141 TYPE_ARG_TYPES (TREE_TYPE (olddecl)) = oldargs;
1144 else if (! same_type_p (TREE_VALUE (t1), TREE_VALUE (t2)))
1147 else if ((DECL_EXTERN_C_P (newdecl)
1148 && DECL_EXTERN_C_P (olddecl))
1149 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1150 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1152 /* A near match; override the builtin. */
1154 if (TREE_PUBLIC (newdecl))
1156 warning (0, "new declaration %q#D", newdecl);
1157 warning (0, "ambiguates built-in declaration %q#D",
1160 else if (warn_shadow)
1161 warning (0, "shadowing %s function %q#D",
1162 DECL_BUILT_IN (olddecl) ? "built-in" : "library",
1166 /* Discard the old built-in function. */
1169 /* Replace the old RTL to avoid problems with inlining. */
1170 COPY_DECL_RTL (newdecl, olddecl);
1172 /* Even if the types match, prefer the new declarations type for
1173 built-ins which have not been explicitly declared, for
1174 exception lists, etc... */
1175 else if (DECL_ANTICIPATED (olddecl))
1177 tree type = TREE_TYPE (newdecl);
1178 tree attribs = (*targetm.merge_type_attributes)
1179 (TREE_TYPE (olddecl), type);
1181 type = cp_build_type_attribute_variant (type, attribs);
1182 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = type;
1185 /* Whether or not the builtin can throw exceptions has no
1186 bearing on this declarator. */
1187 TREE_NOTHROW (olddecl) = 0;
1189 if (DECL_THIS_STATIC (newdecl) && !DECL_THIS_STATIC (olddecl))
1191 /* If a builtin function is redeclared as `static', merge
1192 the declarations, but make the original one static. */
1193 DECL_THIS_STATIC (olddecl) = 1;
1194 TREE_PUBLIC (olddecl) = 0;
1196 /* Make the old declaration consistent with the new one so
1197 that all remnants of the builtin-ness of this function
1198 will be banished. */
1199 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1200 COPY_DECL_RTL (newdecl, olddecl);
1203 else if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1205 if ((TREE_CODE (olddecl) == TYPE_DECL && DECL_ARTIFICIAL (olddecl)
1206 && TREE_CODE (newdecl) != TYPE_DECL
1207 && ! (TREE_CODE (newdecl) == TEMPLATE_DECL
1208 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL))
1209 || (TREE_CODE (newdecl) == TYPE_DECL && DECL_ARTIFICIAL (newdecl)
1210 && TREE_CODE (olddecl) != TYPE_DECL
1211 && ! (TREE_CODE (olddecl) == TEMPLATE_DECL
1212 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
1215 /* We do nothing special here, because C++ does such nasty
1216 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1217 get shadowed, and know that if we need to find a TYPE_DECL
1218 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1219 slot of the identifier. */
1223 if ((TREE_CODE (newdecl) == FUNCTION_DECL
1224 && DECL_FUNCTION_TEMPLATE_P (olddecl))
1225 || (TREE_CODE (olddecl) == FUNCTION_DECL
1226 && DECL_FUNCTION_TEMPLATE_P (newdecl)))
1229 error ("%q#D redeclared as different kind of symbol", newdecl);
1230 if (TREE_CODE (olddecl) == TREE_LIST)
1231 olddecl = TREE_VALUE (olddecl);
1232 error ("previous declaration of %q+#D", olddecl);
1234 return error_mark_node;
1236 else if (!types_match)
1238 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
1239 /* These are certainly not duplicate declarations; they're
1240 from different scopes. */
1243 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1245 /* The name of a class template may not be declared to refer to
1246 any other template, class, function, object, namespace, value,
1247 or type in the same scope. */
1248 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == TYPE_DECL
1249 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1251 error ("declaration of template %q#D", newdecl);
1252 error ("conflicts with previous declaration %q+#D", olddecl);
1254 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == FUNCTION_DECL
1255 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == FUNCTION_DECL
1256 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl))),
1257 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl))))
1258 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1259 DECL_TEMPLATE_PARMS (olddecl))
1260 /* Template functions can be disambiguated by
1262 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl)),
1263 TREE_TYPE (TREE_TYPE (olddecl))))
1265 error ("new declaration %q#D", newdecl);
1266 error ("ambiguates old declaration %q+#D", olddecl);
1270 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1272 if (DECL_EXTERN_C_P (newdecl) && DECL_EXTERN_C_P (olddecl))
1274 error ("declaration of C function %q#D conflicts with",
1276 error ("previous declaration %q+#D here", olddecl);
1278 else if (compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1279 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1281 error ("new declaration %q#D", newdecl);
1282 error ("ambiguates old declaration %q+#D", olddecl);
1289 error ("conflicting declaration %q#D", newdecl);
1290 error ("%q+D has a previous declaration as %q#D", olddecl, olddecl);
1291 return error_mark_node;
1294 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1295 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1296 && (!DECL_TEMPLATE_INFO (newdecl)
1297 || (DECL_TI_TEMPLATE (newdecl)
1298 != DECL_TI_TEMPLATE (olddecl))))
1299 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1300 && (!DECL_TEMPLATE_INFO (olddecl)
1301 || (DECL_TI_TEMPLATE (olddecl)
1302 != DECL_TI_TEMPLATE (newdecl))))))
1303 /* It's OK to have a template specialization and a non-template
1304 with the same type, or to have specializations of two
1305 different templates with the same type. Note that if one is a
1306 specialization, and the other is an instantiation of the same
1307 template, that we do not exit at this point. That situation
1308 can occur if we instantiate a template class, and then
1309 specialize one of its methods. This situation is valid, but
1310 the declarations must be merged in the usual way. */
1312 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1313 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1314 && !DECL_USE_TEMPLATE (newdecl))
1315 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1316 && !DECL_USE_TEMPLATE (olddecl))))
1317 /* One of the declarations is a template instantiation, and the
1318 other is not a template at all. That's OK. */
1320 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1322 /* In [namespace.alias] we have:
1324 In a declarative region, a namespace-alias-definition can be
1325 used to redefine a namespace-alias declared in that declarative
1326 region to refer only to the namespace to which it already
1329 Therefore, if we encounter a second alias directive for the same
1330 alias, we can just ignore the second directive. */
1331 if (DECL_NAMESPACE_ALIAS (newdecl)
1332 && (DECL_NAMESPACE_ALIAS (newdecl)
1333 == DECL_NAMESPACE_ALIAS (olddecl)))
1335 /* [namespace.alias]
1337 A namespace-name or namespace-alias shall not be declared as
1338 the name of any other entity in the same declarative region.
1339 A namespace-name defined at global scope shall not be
1340 declared as the name of any other entity in any global scope
1342 error ("declaration of namespace %qD conflicts with", newdecl);
1343 error ("previous declaration of namespace %q+D here", olddecl);
1344 return error_mark_node;
1348 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1351 error (errmsg, newdecl);
1352 if (DECL_NAME (olddecl) != NULL_TREE)
1353 error ((DECL_INITIAL (olddecl) && namespace_bindings_p ())
1354 ? "%q+#D previously defined here"
1355 : "%q+#D previously declared here", olddecl);
1356 return error_mark_node;
1358 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1359 && DECL_INITIAL (olddecl) != NULL_TREE
1360 && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) == NULL_TREE
1361 && TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != NULL_TREE)
1363 /* Prototype decl follows defn w/o prototype. */
1364 warning (0, "prototype for %q+#D", newdecl);
1365 warning (0, "%Jfollows non-prototype definition here", olddecl);
1367 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1368 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1370 /* extern "C" int foo ();
1371 int foo () { bar (); }
1373 if (current_lang_depth () == 0)
1374 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1377 error ("previous declaration of %q+#D with %qL linkage",
1378 olddecl, DECL_LANGUAGE (olddecl));
1379 error ("conflicts with new declaration with %qL linkage",
1380 DECL_LANGUAGE (newdecl));
1384 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1386 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1388 tree t1 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1389 tree t2 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1392 if (TREE_CODE (TREE_TYPE (newdecl)) == METHOD_TYPE)
1393 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2);
1395 for (; t1 && t1 != void_list_node;
1396 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1397 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1399 if (1 == simple_cst_equal (TREE_PURPOSE (t1),
1402 pedwarn ("default argument given for parameter %d of %q#D",
1404 pedwarn ("after previous specification in %q+#D", olddecl);
1408 error ("default argument given for parameter %d of %q#D",
1410 error ("after previous specification in %q+#D",
1415 if (DECL_DECLARED_INLINE_P (newdecl)
1416 && ! DECL_DECLARED_INLINE_P (olddecl)
1417 && TREE_ADDRESSABLE (olddecl) && warn_inline)
1419 warning (0, "%q#D was used before it was declared inline", newdecl);
1420 warning (0, "%Jprevious non-inline declaration here", olddecl);
1425 /* Do not merge an implicit typedef with an explicit one. In:
1429 typedef class A A __attribute__ ((foo));
1431 the attribute should apply only to the typedef. */
1432 if (TREE_CODE (olddecl) == TYPE_DECL
1433 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1434 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1437 /* If new decl is `static' and an `extern' was seen previously,
1439 warn_extern_redeclared_static (newdecl, olddecl);
1441 /* We have committed to returning 1 at this point. */
1442 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1444 /* Now that functions must hold information normally held
1445 by field decls, there is extra work to do so that
1446 declaration information does not get destroyed during
1448 if (DECL_VINDEX (olddecl))
1449 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1450 if (DECL_CONTEXT (olddecl))
1451 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1452 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1453 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1454 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1455 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1456 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1457 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1458 SET_OVERLOADED_OPERATOR_CODE
1459 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1460 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1462 /* Optionally warn about more than one declaration for the same
1463 name, but don't warn about a function declaration followed by a
1465 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1466 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1467 /* Don't warn about extern decl followed by definition. */
1468 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1469 /* Don't warn about friends, let add_friend take care of it. */
1470 && ! (newdecl_is_friend || DECL_FRIEND_P (olddecl)))
1472 warning (0, "redundant redeclaration of %qD in same scope", newdecl);
1473 warning (0, "previous declaration of %q+D", olddecl);
1477 /* Deal with C++: must preserve virtual function table size. */
1478 if (TREE_CODE (olddecl) == TYPE_DECL)
1480 tree newtype = TREE_TYPE (newdecl);
1481 tree oldtype = TREE_TYPE (olddecl);
1483 if (newtype != error_mark_node && oldtype != error_mark_node
1484 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1485 CLASSTYPE_FRIEND_CLASSES (newtype)
1486 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1488 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1491 /* Copy all the DECL_... slots specified in the new decl
1492 except for any that we copy here from the old type. */
1493 DECL_ATTRIBUTES (newdecl)
1494 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1496 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1498 TREE_TYPE (olddecl) = TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl));
1499 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1500 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1501 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1503 /* If the new declaration is a definition, update the file and
1504 line information on the declaration. */
1505 if (DECL_INITIAL (DECL_TEMPLATE_RESULT (olddecl)) == NULL_TREE
1506 && DECL_INITIAL (DECL_TEMPLATE_RESULT (newdecl)) != NULL_TREE)
1508 DECL_SOURCE_LOCATION (olddecl)
1509 = DECL_SOURCE_LOCATION (DECL_TEMPLATE_RESULT (olddecl))
1510 = DECL_SOURCE_LOCATION (newdecl);
1511 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1512 DECL_ARGUMENTS (DECL_TEMPLATE_RESULT (olddecl))
1513 = DECL_ARGUMENTS (DECL_TEMPLATE_RESULT (newdecl));
1516 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1518 DECL_INLINE (DECL_TEMPLATE_RESULT (olddecl))
1519 |= DECL_INLINE (DECL_TEMPLATE_RESULT (newdecl));
1520 DECL_DECLARED_INLINE_P (DECL_TEMPLATE_RESULT (olddecl))
1521 |= DECL_DECLARED_INLINE_P (DECL_TEMPLATE_RESULT (newdecl));
1529 /* Automatically handles default parameters. */
1530 tree oldtype = TREE_TYPE (olddecl);
1533 /* Merge the data types specified in the two decls. */
1534 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1536 /* If merge_types produces a non-typedef type, just use the old type. */
1537 if (TREE_CODE (newdecl) == TYPE_DECL
1538 && newtype == DECL_ORIGINAL_TYPE (newdecl))
1541 if (TREE_CODE (newdecl) == VAR_DECL)
1543 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
1544 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
1545 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl)
1546 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl);
1547 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
1548 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
1551 /* Do this after calling `merge_types' so that default
1552 parameters don't confuse us. */
1553 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1554 && (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (newdecl))
1555 != TYPE_RAISES_EXCEPTIONS (TREE_TYPE (olddecl))))
1557 TREE_TYPE (newdecl) = build_exception_variant (newtype,
1558 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (newdecl)));
1559 TREE_TYPE (olddecl) = build_exception_variant (newtype,
1560 TYPE_RAISES_EXCEPTIONS (oldtype));
1562 if ((pedantic || ! DECL_IN_SYSTEM_HEADER (olddecl))
1563 && ! DECL_IS_BUILTIN (olddecl)
1565 && !comp_except_specs (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (newdecl)),
1566 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (olddecl)), 1))
1568 error ("declaration of %qF throws different exceptions",
1570 error ("than previous declaration %q+F", olddecl);
1573 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
1575 /* Lay the type out, unless already done. */
1576 if (! same_type_p (newtype, oldtype)
1577 && TREE_TYPE (newdecl) != error_mark_node
1578 && !(processing_template_decl && uses_template_parms (newdecl)))
1579 layout_type (TREE_TYPE (newdecl));
1581 if ((TREE_CODE (newdecl) == VAR_DECL
1582 || TREE_CODE (newdecl) == PARM_DECL
1583 || TREE_CODE (newdecl) == RESULT_DECL
1584 || TREE_CODE (newdecl) == FIELD_DECL
1585 || TREE_CODE (newdecl) == TYPE_DECL)
1586 && !(processing_template_decl && uses_template_parms (newdecl)))
1587 layout_decl (newdecl, 0);
1589 /* Merge the type qualifiers. */
1590 if (TREE_READONLY (newdecl))
1591 TREE_READONLY (olddecl) = 1;
1592 if (TREE_THIS_VOLATILE (newdecl))
1593 TREE_THIS_VOLATILE (olddecl) = 1;
1594 if (TREE_NOTHROW (newdecl))
1595 TREE_NOTHROW (olddecl) = 1;
1597 /* Merge deprecatedness. */
1598 if (TREE_DEPRECATED (newdecl))
1599 TREE_DEPRECATED (olddecl) = 1;
1601 /* Merge the initialization information. */
1602 if (DECL_INITIAL (newdecl) == NULL_TREE
1603 && DECL_INITIAL (olddecl) != NULL_TREE)
1605 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1606 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1607 if (CAN_HAVE_FULL_LANG_DECL_P (newdecl)
1608 && DECL_LANG_SPECIFIC (newdecl)
1609 && DECL_LANG_SPECIFIC (olddecl))
1611 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1612 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1616 /* Merge the section attribute.
1617 We want to issue an error if the sections conflict but that must be
1618 done later in decl_attributes since we are called before attributes
1620 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1621 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1623 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1625 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1626 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1627 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1628 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1629 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1630 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
1631 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1632 DECL_IS_PURE (newdecl) |= DECL_IS_PURE (olddecl);
1633 /* Keep the old RTL. */
1634 COPY_DECL_RTL (olddecl, newdecl);
1636 else if (TREE_CODE (newdecl) == VAR_DECL
1637 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
1639 /* Keep the old RTL. We cannot keep the old RTL if the old
1640 declaration was for an incomplete object and the new
1641 declaration is not since many attributes of the RTL will
1643 COPY_DECL_RTL (olddecl, newdecl);
1646 /* If cannot merge, then use the new type and qualifiers,
1647 and don't preserve the old rtl. */
1650 /* Clean out any memory we had of the old declaration. */
1651 tree oldstatic = value_member (olddecl, static_aggregates);
1653 TREE_VALUE (oldstatic) = error_mark_node;
1655 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1656 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1657 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1658 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1661 /* Merge the storage class information. */
1662 merge_weak (newdecl, olddecl);
1664 DECL_ONE_ONLY (newdecl) |= DECL_ONE_ONLY (olddecl);
1665 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
1666 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1667 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
1668 if (! DECL_EXTERNAL (olddecl))
1669 DECL_EXTERNAL (newdecl) = 0;
1671 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
1673 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
1674 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
1675 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
1676 DECL_TEMPLATE_INSTANTIATED (newdecl)
1677 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
1679 /* If the OLDDECL is an instantiation and/or specialization,
1680 then the NEWDECL must be too. But, it may not yet be marked
1681 as such if the caller has created NEWDECL, but has not yet
1682 figured out that it is a redeclaration. */
1683 if (!DECL_USE_TEMPLATE (newdecl))
1684 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
1686 /* Don't really know how much of the language-specific
1687 values we should copy from old to new. */
1688 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
1689 DECL_LANG_SPECIFIC (newdecl)->decl_flags.u2 =
1690 DECL_LANG_SPECIFIC (olddecl)->decl_flags.u2;
1691 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
1692 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
1693 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
1694 DECL_INITIALIZED_IN_CLASS_P (newdecl)
1695 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
1696 olddecl_friend = DECL_FRIEND_P (olddecl);
1697 hidden_friend = (DECL_ANTICIPATED (olddecl)
1698 && DECL_HIDDEN_FRIEND_P (olddecl)
1699 && newdecl_is_friend);
1701 /* Only functions have DECL_BEFRIENDING_CLASSES. */
1702 if (TREE_CODE (newdecl) == FUNCTION_DECL
1703 || DECL_FUNCTION_TEMPLATE_P (newdecl))
1705 DECL_BEFRIENDING_CLASSES (newdecl)
1706 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
1707 DECL_BEFRIENDING_CLASSES (olddecl));
1708 /* DECL_THUNKS is only valid for virtual functions,
1709 otherwise it is a DECL_FRIEND_CONTEXT. */
1710 if (DECL_VIRTUAL_P (newdecl))
1711 DECL_THUNKS (newdecl) = DECL_THUNKS (olddecl);
1715 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1717 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
1718 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
1720 /* If newdecl is not a specialization, then it is not a
1721 template-related function at all. And that means that we
1722 should have exited above, returning 0. */
1723 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
1725 if (TREE_USED (olddecl))
1726 /* From [temp.expl.spec]:
1728 If a template, a member template or the member of a class
1729 template is explicitly specialized then that
1730 specialization shall be declared before the first use of
1731 that specialization that would cause an implicit
1732 instantiation to take place, in every translation unit in
1733 which such a use occurs. */
1734 error ("explicit specialization of %qD after first use",
1737 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
1739 /* [temp.expl.spec/14] We don't inline explicit specialization
1740 just because the primary template says so. */
1744 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
1745 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
1747 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
1749 /* If either decl says `inline', this fn is inline, unless
1750 its definition was passed already. */
1751 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == NULL_TREE)
1752 DECL_INLINE (olddecl) = 1;
1753 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1755 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1756 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1759 /* Preserve abstractness on cloned [cd]tors. */
1760 DECL_ABSTRACT (newdecl) = DECL_ABSTRACT (olddecl);
1764 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1765 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
1766 COPY_DECL_RTL (newdecl, olddecl);
1768 if (! types_match || new_defines_function)
1770 /* These need to be copied so that the names are available.
1771 Note that if the types do match, we'll preserve inline
1772 info and other bits, but if not, we won't. */
1773 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
1774 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
1776 if (new_defines_function)
1777 /* If defining a function declared with other language
1778 linkage, use the previously declared language linkage. */
1779 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1780 else if (types_match)
1782 /* If redeclaring a builtin function, and not a definition,
1783 it stays built in. */
1784 if (DECL_BUILT_IN (olddecl))
1786 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1787 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1788 /* If we're keeping the built-in definition, keep the rtl,
1789 regardless of declaration matches. */
1790 COPY_DECL_RTL (olddecl, newdecl);
1793 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1794 /* Don't clear out the arguments if we're redefining a function. */
1795 if (DECL_ARGUMENTS (olddecl))
1796 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1799 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1800 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
1802 /* Now preserve various other info from the definition. */
1803 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
1804 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
1805 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
1806 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1808 /* Warn about conflicting visibility specifications. */
1809 if (DECL_VISIBILITY_SPECIFIED (olddecl)
1810 && DECL_VISIBILITY_SPECIFIED (newdecl)
1811 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
1813 warning (OPT_Wattributes, "%q+D: visibility attribute ignored "
1814 "because it", newdecl);
1815 warning (OPT_Wattributes, "%Jconflicts with previous "
1816 "declaration here", olddecl);
1818 /* Choose the declaration which specified visibility. */
1819 if (DECL_VISIBILITY_SPECIFIED (olddecl))
1821 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
1822 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
1824 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
1825 so keep this behavior. */
1826 if (TREE_CODE (newdecl) == VAR_DECL && DECL_HAS_INIT_PRIORITY_P (newdecl))
1828 SET_DECL_INIT_PRIORITY (olddecl, DECL_INIT_PRIORITY (newdecl));
1829 DECL_HAS_INIT_PRIORITY_P (olddecl) = 1;
1832 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
1833 with that from NEWDECL below. */
1834 if (DECL_LANG_SPECIFIC (olddecl))
1836 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
1837 != DECL_LANG_SPECIFIC (newdecl));
1838 ggc_free (DECL_LANG_SPECIFIC (olddecl));
1841 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1845 function_size = sizeof (struct tree_decl_common);
1847 memcpy ((char *) olddecl + sizeof (struct tree_common),
1848 (char *) newdecl + sizeof (struct tree_common),
1849 function_size - sizeof (struct tree_common));
1851 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
1852 (char *) newdecl + sizeof (struct tree_decl_common),
1853 sizeof (struct tree_function_decl) - sizeof (struct tree_decl_common));
1854 if (DECL_TEMPLATE_INFO (newdecl))
1855 /* If newdecl is a template instantiation, it is possible that
1856 the following sequence of events has occurred:
1858 o A friend function was declared in a class template. The
1859 class template was instantiated.
1861 o The instantiation of the friend declaration was
1862 recorded on the instantiation list, and is newdecl.
1864 o Later, however, instantiate_class_template called pushdecl
1865 on the newdecl to perform name injection. But, pushdecl in
1866 turn called duplicate_decls when it discovered that another
1867 declaration of a global function with the same name already
1870 o Here, in duplicate_decls, we decided to clobber newdecl.
1872 If we're going to do that, we'd better make sure that
1873 olddecl, and not newdecl, is on the list of
1874 instantiations so that if we try to do the instantiation
1875 again we won't get the clobbered declaration. */
1876 reregister_specialization (newdecl,
1877 DECL_TI_TEMPLATE (newdecl),
1882 size_t size = tree_code_size (TREE_CODE (olddecl));
1883 memcpy ((char *) olddecl + sizeof (struct tree_common),
1884 (char *) newdecl + sizeof (struct tree_common),
1885 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
1886 switch (TREE_CODE (olddecl))
1896 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
1897 (char *) newdecl + sizeof (struct tree_decl_common),
1898 size - sizeof (struct tree_decl_common)
1899 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
1903 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
1904 (char *) newdecl + sizeof (struct tree_decl_common),
1905 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)
1906 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
1910 DECL_UID (olddecl) = olddecl_uid;
1912 DECL_FRIEND_P (olddecl) = 1;
1915 DECL_ANTICIPATED (olddecl) = 1;
1916 DECL_HIDDEN_FRIEND_P (olddecl) = 1;
1919 /* NEWDECL contains the merged attribute lists.
1920 Update OLDDECL to be the same. */
1921 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
1923 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
1924 so that encode_section_info has a chance to look at the new decl
1925 flags and attributes. */
1926 if (DECL_RTL_SET_P (olddecl)
1927 && (TREE_CODE (olddecl) == FUNCTION_DECL
1928 || (TREE_CODE (olddecl) == VAR_DECL
1929 && TREE_STATIC (olddecl))))
1930 make_decl_rtl (olddecl);
1932 /* The NEWDECL will no longer be needed. Because every out-of-class
1933 declaration of a member results in a call to duplicate_decls,
1934 freeing these nodes represents in a significant savings. */
1940 /* Return zero if the declaration NEWDECL is valid
1941 when the declaration OLDDECL (assumed to be for the same name)
1942 has already been seen.
1943 Otherwise return an error message format string with a %s
1944 where the identifier should go. */
1947 redeclaration_error_message (tree newdecl, tree olddecl)
1949 if (TREE_CODE (newdecl) == TYPE_DECL)
1951 /* Because C++ can put things into name space for free,
1952 constructs like "typedef struct foo { ... } foo"
1953 would look like an erroneous redeclaration. */
1954 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
1957 return "redefinition of %q#D";
1959 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1961 /* If this is a pure function, its olddecl will actually be
1962 the original initialization to `0' (which we force to call
1963 abort()). Don't complain about redefinition in this case. */
1964 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
1965 && DECL_INITIAL (olddecl) == NULL_TREE)
1968 /* If both functions come from different namespaces, this is not
1969 a redeclaration - this is a conflict with a used function. */
1970 if (DECL_NAMESPACE_SCOPE_P (olddecl)
1971 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
1972 && ! decls_match (olddecl, newdecl))
1973 return "%qD conflicts with used function";
1975 /* We'll complain about linkage mismatches in
1976 warn_extern_redeclared_static. */
1978 /* Defining the same name twice is no good. */
1979 if (DECL_INITIAL (olddecl) != NULL_TREE
1980 && DECL_INITIAL (newdecl) != NULL_TREE)
1982 if (DECL_NAME (olddecl) == NULL_TREE)
1983 return "%q#D not declared in class";
1985 return "redefinition of %q#D";
1989 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1993 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1995 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
1996 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
1997 return "redefinition of %q#D";
2001 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
2002 || (DECL_TEMPLATE_RESULT (newdecl)
2003 == DECL_TEMPLATE_RESULT (olddecl)))
2006 nt = DECL_TEMPLATE_RESULT (newdecl);
2007 if (DECL_TEMPLATE_INFO (nt))
2008 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
2009 ot = DECL_TEMPLATE_RESULT (olddecl);
2010 if (DECL_TEMPLATE_INFO (ot))
2011 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
2012 if (DECL_INITIAL (nt) && DECL_INITIAL (ot))
2013 return "redefinition of %q#D";
2017 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2019 /* Objects declared at top level: */
2020 /* If at least one is a reference, it's ok. */
2021 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2023 /* Reject two definitions. */
2024 return "redefinition of %q#D";
2028 /* Objects declared with block scope: */
2029 /* Reject two definitions, and reject a definition
2030 together with an external reference. */
2031 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2032 return "redeclaration of %q#D";
2037 /* Create a new label, named ID. */
2040 make_label_decl (tree id, int local_p)
2044 decl = build_decl (LABEL_DECL, id, void_type_node);
2046 DECL_CONTEXT (decl) = current_function_decl;
2047 DECL_MODE (decl) = VOIDmode;
2048 C_DECLARED_LABEL_FLAG (decl) = local_p;
2050 /* Say where one reference is to the label, for the sake of the
2051 error if it is not defined. */
2052 DECL_SOURCE_LOCATION (decl) = input_location;
2054 /* Record the fact that this identifier is bound to this label. */
2055 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2060 /* Record this label on the list of used labels so that we can check
2061 at the end of the function to see whether or not the label was
2062 actually defined, and so we can check when the label is defined whether
2063 this use is valid. */
2066 use_label (tree decl)
2068 if (named_label_uses == NULL
2069 || named_label_uses->names_in_scope != current_binding_level->names
2070 || named_label_uses->label_decl != decl)
2072 struct named_label_use_list *new_ent;
2073 new_ent = GGC_NEW (struct named_label_use_list);
2074 new_ent->label_decl = decl;
2075 new_ent->names_in_scope = current_binding_level->names;
2076 new_ent->binding_level = current_binding_level;
2077 new_ent->o_goto_locus = input_location;
2078 new_ent->next = named_label_uses;
2079 named_label_uses = new_ent;
2083 /* Look for a label named ID in the current function. If one cannot
2084 be found, create one. (We keep track of used, but undefined,
2085 labels, and complain about them at the end of a function.) */
2088 lookup_label (tree id)
2091 struct named_label_list *ent;
2093 timevar_push (TV_NAME_LOOKUP);
2094 /* You can't use labels at global scope. */
2095 if (current_function_decl == NULL_TREE)
2097 error ("label %qE referenced outside of any function", id);
2098 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, NULL_TREE);
2101 /* See if we've already got this label. */
2102 decl = IDENTIFIER_LABEL_VALUE (id);
2103 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2104 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2106 /* Record this label on the list of labels used in this function.
2107 We do this before calling make_label_decl so that we get the
2108 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2109 ent = GGC_CNEW (struct named_label_list);
2110 ent->old_value = IDENTIFIER_LABEL_VALUE (id);
2111 ent->next = named_labels;
2114 /* We need a new label. */
2115 decl = make_label_decl (id, /*local_p=*/0);
2117 /* Now fill in the information we didn't have before. */
2118 ent->label_decl = decl;
2120 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2123 /* Declare a local label named ID. */
2126 declare_local_label (tree id)
2130 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2131 this scope we can restore the old value of
2132 IDENTIFIER_TYPE_VALUE. */
2133 current_binding_level->shadowed_labels
2134 = tree_cons (IDENTIFIER_LABEL_VALUE (id), NULL_TREE,
2135 current_binding_level->shadowed_labels);
2136 /* Look for the label. */
2137 decl = make_label_decl (id, /*local_p=*/1);
2138 /* Now fill in the information we didn't have before. */
2139 TREE_VALUE (current_binding_level->shadowed_labels) = decl;
2144 /* Returns nonzero if it is ill-formed to jump past the declaration of
2145 DECL. Returns 2 if it's also a real problem. */
2148 decl_jump_unsafe (tree decl)
2150 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl))
2153 if (TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))
2154 || DECL_NONTRIVIALLY_INITIALIZED_P (decl))
2157 if (pod_type_p (TREE_TYPE (decl)))
2160 /* The POD stuff is just pedantry; why should it matter if the class
2161 contains a field of pointer to member type? */
2165 /* Check that a single previously seen jump to a newly defined label
2166 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2167 the jump context; NAMES are the names in scope in LEVEL at the jump
2168 context; FILE and LINE are the source position of the jump or 0. */
2171 check_previous_goto_1 (tree decl,
2172 struct cp_binding_level* level,
2173 tree names, const location_t *locus)
2177 struct cp_binding_level *b = current_binding_level;
2178 for (; b; b = b->level_chain)
2180 tree new_decls = b->names;
2181 tree old_decls = (b == level ? names : NULL_TREE);
2182 for (; new_decls != old_decls;
2183 new_decls = TREE_CHAIN (new_decls))
2185 int problem = decl_jump_unsafe (new_decls);
2192 pedwarn ("jump to label %qD", decl);
2194 pedwarn ("jump to case label");
2197 pedwarn ("%H from here", locus);
2202 error (" crosses initialization of %q+#D", new_decls);
2204 pedwarn (" enters scope of non-POD %q+#D", new_decls);
2209 if ((b->kind == sk_try || b->kind == sk_catch) && ! saw_eh)
2214 pedwarn ("jump to label %qD", decl);
2216 pedwarn ("jump to case label");
2219 pedwarn ("%H from here", locus);
2222 if (b->kind == sk_try)
2223 error (" enters try block");
2225 error (" enters catch block");
2232 check_previous_goto (struct named_label_use_list* use)
2234 check_previous_goto_1 (use->label_decl, use->binding_level,
2235 use->names_in_scope, &use->o_goto_locus);
2239 check_switch_goto (struct cp_binding_level* level)
2241 check_previous_goto_1 (NULL_TREE, level, level->names, NULL);
2244 /* Check that any previously seen jumps to a newly defined label DECL
2245 are OK. Called by define_label. */
2248 check_previous_gotos (tree decl)
2250 struct named_label_use_list **usep;
2252 if (! TREE_USED (decl))
2255 for (usep = &named_label_uses; *usep; )
2257 struct named_label_use_list *use = *usep;
2258 if (use->label_decl == decl)
2260 check_previous_goto (use);
2264 usep = &(use->next);
2268 /* Check that a new jump to a label DECL is OK. Called by
2269 finish_goto_stmt. */
2272 check_goto (tree decl)
2276 struct named_label_list *lab;
2278 /* We can't know where a computed goto is jumping. So we assume
2280 if (! DECL_P (decl))
2283 /* If the label hasn't been defined yet, defer checking. */
2284 if (! DECL_INITIAL (decl))
2290 for (lab = named_labels; lab; lab = lab->next)
2291 if (decl == lab->label_decl)
2294 /* If the label is not on named_labels it's a gcc local label, so
2295 it must be in an outer scope, so jumping to it is always OK. */
2299 if ((lab->in_try_scope || lab->in_catch_scope || lab->bad_decls)
2302 pedwarn ("jump to label %q+D", decl);
2303 pedwarn (" from here");
2307 for (bad = lab->bad_decls; bad; bad = TREE_CHAIN (bad))
2309 tree b = TREE_VALUE (bad);
2310 int u = decl_jump_unsafe (b);
2312 if (u > 1 && DECL_ARTIFICIAL (b))
2313 /* Can't skip init of __exception_info. */
2314 error ("%J enters catch block", b);
2316 error (" skips initialization of %q+#D", b);
2318 pedwarn (" enters scope of non-POD %q+#D", b);
2321 if (lab->in_try_scope)
2322 error (" enters try block");
2323 else if (lab->in_catch_scope)
2324 error (" enters catch block");
2327 /* Define a label, specifying the location in the source file.
2328 Return the LABEL_DECL node for the label. */
2331 define_label (location_t location, tree name)
2333 tree decl = lookup_label (name);
2334 struct named_label_list *ent;
2335 struct cp_binding_level *p;
2337 timevar_push (TV_NAME_LOOKUP);
2338 for (ent = named_labels; ent; ent = ent->next)
2339 if (ent->label_decl == decl)
2342 /* After labels, make any new cleanups in the function go into their
2343 own new (temporary) binding contour. */
2344 for (p = current_binding_level;
2345 p->kind != sk_function_parms;
2347 p->more_cleanups_ok = 0;
2349 if (name == get_identifier ("wchar_t"))
2350 pedwarn ("label named wchar_t");
2352 if (DECL_INITIAL (decl) != NULL_TREE)
2353 error ("duplicate label %qD", decl);
2356 /* Mark label as having been defined. */
2357 DECL_INITIAL (decl) = error_mark_node;
2358 /* Say where in the source. */
2359 DECL_SOURCE_LOCATION (decl) = location;
2362 ent->names_in_scope = current_binding_level->names;
2363 ent->binding_level = current_binding_level;
2365 check_previous_gotos (decl);
2368 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2373 struct cp_binding_level *level;
2374 struct cp_switch *next;
2375 /* The SWITCH_STMT being built. */
2377 /* A splay-tree mapping the low element of a case range to the high
2378 element, or NULL_TREE if there is no high element. Used to
2379 determine whether or not a new case label duplicates an old case
2380 label. We need a tree, rather than simply a hash table, because
2381 of the GNU case range extension. */
2385 /* A stack of the currently active switch statements. The innermost
2386 switch statement is on the top of the stack. There is no need to
2387 mark the stack for garbage collection because it is only active
2388 during the processing of the body of a function, and we never
2389 collect at that point. */
2391 static struct cp_switch *switch_stack;
2393 /* Called right after a switch-statement condition is parsed.
2394 SWITCH_STMT is the switch statement being parsed. */
2397 push_switch (tree switch_stmt)
2399 struct cp_switch *p = xmalloc (sizeof (struct cp_switch));
2400 p->level = current_binding_level;
2401 p->next = switch_stack;
2402 p->switch_stmt = switch_stmt;
2403 p->cases = splay_tree_new (case_compare, NULL, NULL);
2410 struct cp_switch *cs = switch_stack;
2411 location_t switch_location;
2413 /* Emit warnings as needed. */
2414 if (EXPR_HAS_LOCATION (cs->switch_stmt))
2415 switch_location = EXPR_LOCATION (cs->switch_stmt);
2417 switch_location = input_location;
2418 if (!processing_template_decl)
2419 c_do_switch_warnings (cs->cases, switch_location,
2420 SWITCH_STMT_TYPE (cs->switch_stmt),
2421 SWITCH_STMT_COND (cs->switch_stmt));
2423 splay_tree_delete (cs->cases);
2424 switch_stack = switch_stack->next;
2428 /* Note that we've seen a definition of a case label, and complain if this
2429 is a bad place for one. */
2432 finish_case_label (tree low_value, tree high_value)
2435 struct cp_binding_level *p;
2437 if (processing_template_decl)
2441 /* For templates, just add the case label; we'll do semantic
2442 analysis at instantiation-time. */
2443 label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
2444 return add_stmt (build_case_label (low_value, high_value, label));
2447 /* Find the condition on which this switch statement depends. */
2448 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
2449 if (cond && TREE_CODE (cond) == TREE_LIST)
2450 cond = TREE_VALUE (cond);
2452 r = c_add_case_label (switch_stack->cases, cond, TREE_TYPE (cond),
2453 low_value, high_value);
2455 check_switch_goto (switch_stack->level);
2457 /* After labels, make any new cleanups in the function go into their
2458 own new (temporary) binding contour. */
2459 for (p = current_binding_level;
2460 p->kind != sk_function_parms;
2462 p->more_cleanups_ok = 0;
2467 /* Hash a TYPENAME_TYPE. K is really of type `tree'. */
2470 typename_hash (const void* k)
2475 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
2476 ^ htab_hash_pointer (DECL_NAME (TYPE_NAME (t))));
2481 typedef struct typename_info {
2489 /* Compare two TYPENAME_TYPEs. K1 and K2 are really of type `tree'. */
2492 typename_compare (const void * k1, const void * k2)
2495 const typename_info *t2;
2498 t2 = (const typename_info *) k2;
2500 return (DECL_NAME (TYPE_NAME (t1)) == t2->name
2501 && TYPE_CONTEXT (t1) == t2->scope
2502 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
2503 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
2504 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
2507 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
2508 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
2510 Returns the new TYPENAME_TYPE. */
2512 static GTY ((param_is (union tree_node))) htab_t typename_htab;
2515 build_typename_type (tree context, tree name, tree fullname,
2516 enum tag_types tag_type)
2524 if (typename_htab == NULL)
2525 typename_htab = htab_create_ggc (61, &typename_hash,
2526 &typename_compare, NULL);
2528 ti.scope = FROB_CONTEXT (context);
2530 ti.template_id = fullname;
2531 ti.enum_p = tag_type == enum_type;
2532 ti.class_p = (tag_type == class_type
2533 || tag_type == record_type
2534 || tag_type == union_type);
2535 hash = (htab_hash_pointer (ti.scope)
2536 ^ htab_hash_pointer (ti.name));
2538 /* See if we already have this type. */
2539 e = htab_find_slot_with_hash (typename_htab, &ti, hash, INSERT);
2544 /* Build the TYPENAME_TYPE. */
2545 t = make_aggr_type (TYPENAME_TYPE);
2546 TYPE_CONTEXT (t) = ti.scope;
2547 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
2548 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
2549 TYPENAME_IS_CLASS_P (t) = ti.class_p;
2551 /* Build the corresponding TYPE_DECL. */
2552 d = build_decl (TYPE_DECL, name, t);
2553 TYPE_NAME (TREE_TYPE (d)) = d;
2554 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
2555 DECL_CONTEXT (d) = FROB_CONTEXT (context);
2556 DECL_ARTIFICIAL (d) = 1;
2558 /* Store it in the hash table. */
2565 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
2566 provided to name the type. Returns an appropriate type, unless an
2567 error occurs, in which case error_mark_node is returned. If we
2568 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
2569 return that, rather than the _TYPE it corresponds to, in other
2570 cases we look through the type decl. If TF_ERROR is set, complain
2571 about errors, otherwise be quiet. */
2574 make_typename_type (tree context, tree name, enum tag_types tag_type,
2575 tsubst_flags_t complain)
2579 if (name == error_mark_node
2580 || context == NULL_TREE
2581 || context == error_mark_node)
2582 return error_mark_node;
2586 if (!(TYPE_LANG_SPECIFIC (name)
2587 && (CLASSTYPE_IS_TEMPLATE (name)
2588 || CLASSTYPE_USE_TEMPLATE (name))))
2589 name = TYPE_IDENTIFIER (name);
2591 /* Create a TEMPLATE_ID_EXPR for the type. */
2592 name = build_nt (TEMPLATE_ID_EXPR,
2593 CLASSTYPE_TI_TEMPLATE (name),
2594 CLASSTYPE_TI_ARGS (name));
2596 else if (TREE_CODE (name) == TYPE_DECL)
2597 name = DECL_NAME (name);
2601 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
2603 name = TREE_OPERAND (name, 0);
2604 if (TREE_CODE (name) == TEMPLATE_DECL)
2605 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
2607 if (TREE_CODE (name) == TEMPLATE_DECL)
2609 error ("%qD used without template parameters", name);
2610 return error_mark_node;
2612 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
2613 gcc_assert (TYPE_P (context));
2615 if (!dependent_type_p (context)
2616 || currently_open_class (context))
2618 if (TREE_CODE (fullname) == TEMPLATE_ID_EXPR)
2620 tree tmpl = NULL_TREE;
2621 if (IS_AGGR_TYPE (context))
2622 tmpl = lookup_field (context, name, 0, false);
2623 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
2625 if (complain & tf_error)
2626 error ("no class template named %q#T in %q#T",
2628 return error_mark_node;
2631 if (complain & tf_error)
2632 perform_or_defer_access_check (TYPE_BINFO (context), tmpl);
2634 return lookup_template_class (tmpl,
2635 TREE_OPERAND (fullname, 1),
2637 /*entering_scope=*/0,
2638 tf_error | tf_warning | tf_user);
2644 if (!IS_AGGR_TYPE (context))
2646 if (complain & tf_error)
2647 error ("no type named %q#T in %q#T", name, context);
2648 return error_mark_node;
2651 t = lookup_field (context, name, 0, true);
2654 if (TREE_CODE (t) != TYPE_DECL)
2656 if (complain & tf_error)
2657 error ("no type named %q#T in %q#T", name, context);
2658 return error_mark_node;
2661 if (complain & tf_error)
2662 perform_or_defer_access_check (TYPE_BINFO (context), t);
2664 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
2672 /* If the CONTEXT is not a template type, then either the field is
2673 there now or its never going to be. */
2674 if (!dependent_type_p (context))
2676 if (complain & tf_error)
2677 error ("no type named %q#T in %q#T", name, context);
2678 return error_mark_node;
2681 return build_typename_type (context, name, fullname, tag_type);
2684 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
2685 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
2686 in which case error_mark_node is returned.
2688 If PARM_LIST is non-NULL, also make sure that the template parameter
2689 list of TEMPLATE_DECL matches.
2691 If COMPLAIN zero, don't complain about any errors that occur. */
2694 make_unbound_class_template (tree context, tree name, tree parm_list,
2695 tsubst_flags_t complain)
2701 name = TYPE_IDENTIFIER (name);
2702 else if (DECL_P (name))
2703 name = DECL_NAME (name);
2704 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
2706 if (!dependent_type_p (context)
2707 || currently_open_class (context))
2709 tree tmpl = NULL_TREE;
2711 if (IS_AGGR_TYPE (context))
2712 tmpl = lookup_field (context, name, 0, false);
2714 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
2716 if (complain & tf_error)
2717 error ("no class template named %q#T in %q#T", name, context);
2718 return error_mark_node;
2722 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
2724 if (complain & tf_error)
2726 error ("template parameters do not match template");
2727 error ("%q+D declared here", tmpl);
2729 return error_mark_node;
2732 if (complain & tf_error)
2733 perform_or_defer_access_check (TYPE_BINFO (context), tmpl);
2738 /* Build the UNBOUND_CLASS_TEMPLATE. */
2739 t = make_aggr_type (UNBOUND_CLASS_TEMPLATE);
2740 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
2741 TREE_TYPE (t) = NULL_TREE;
2743 /* Build the corresponding TEMPLATE_DECL. */
2744 d = build_decl (TEMPLATE_DECL, name, t);
2745 TYPE_NAME (TREE_TYPE (d)) = d;
2746 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
2747 DECL_CONTEXT (d) = FROB_CONTEXT (context);
2748 DECL_ARTIFICIAL (d) = 1;
2749 DECL_TEMPLATE_PARMS (d) = parm_list;
2756 /* Push the declarations of builtin types into the namespace.
2757 RID_INDEX is the index of the builtin type in the array
2758 RID_POINTERS. NAME is the name used when looking up the builtin
2759 type. TYPE is the _TYPE node for the builtin type. */
2762 record_builtin_type (enum rid rid_index,
2766 tree rname = NULL_TREE, tname = NULL_TREE;
2767 tree tdecl = NULL_TREE;
2769 if ((int) rid_index < (int) RID_MAX)
2770 rname = ridpointers[(int) rid_index];
2772 tname = get_identifier (name);
2774 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
2775 eliminated. Built-in types should not be looked up name; their
2776 names are keywords that the parser can recognize. However, there
2777 is code in c-common.c that uses identifier_global_value to look
2778 up built-in types by name. */
2781 tdecl = build_decl (TYPE_DECL, tname, type);
2782 DECL_ARTIFICIAL (tdecl) = 1;
2783 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
2789 tdecl = build_decl (TYPE_DECL, rname, type);
2790 DECL_ARTIFICIAL (tdecl) = 1;
2792 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
2795 if (!TYPE_NAME (type))
2796 TYPE_NAME (type) = tdecl;
2799 debug_hooks->type_decl (tdecl, 0);
2802 /* Record one of the standard Java types.
2803 * Declare it as having the given NAME.
2804 * If SIZE > 0, it is the size of one of the integral types;
2805 * otherwise it is the negative of the size of one of the other types. */
2808 record_builtin_java_type (const char* name, int size)
2812 type = make_signed_type (size);
2813 else if (size > -32)
2814 { /* "__java_char" or ""__java_boolean". */
2815 type = make_unsigned_type (-size);
2816 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
2819 { /* "__java_float" or ""__java_double". */
2820 type = make_node (REAL_TYPE);
2821 TYPE_PRECISION (type) = - size;
2824 record_builtin_type (RID_MAX, name, type);
2825 decl = TYPE_NAME (type);
2827 /* Suppress generate debug symbol entries for these types,
2828 since for normal C++ they are just clutter.
2829 However, push_lang_context undoes this if extern "Java" is seen. */
2830 DECL_IGNORED_P (decl) = 1;
2832 TYPE_FOR_JAVA (type) = 1;
2836 /* Push a type into the namespace so that the back-ends ignore it. */
2839 record_unknown_type (tree type, const char* name)
2841 tree decl = pushdecl (build_decl (TYPE_DECL, get_identifier (name), type));
2842 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
2843 DECL_IGNORED_P (decl) = 1;
2844 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
2845 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
2846 TYPE_ALIGN (type) = 1;
2847 TYPE_USER_ALIGN (type) = 0;
2848 TYPE_MODE (type) = TYPE_MODE (void_type_node);
2851 /* A string for which we should create an IDENTIFIER_NODE at
2854 typedef struct predefined_identifier
2856 /* The name of the identifier. */
2857 const char *const name;
2858 /* The place where the IDENTIFIER_NODE should be stored. */
2860 /* Nonzero if this is the name of a constructor or destructor. */
2861 const int ctor_or_dtor_p;
2862 } predefined_identifier;
2864 /* Create all the predefined identifiers. */
2867 initialize_predefined_identifiers (void)
2869 const predefined_identifier *pid;
2871 /* A table of identifiers to create at startup. */
2872 static const predefined_identifier predefined_identifiers[] = {
2873 { "C++", &lang_name_cplusplus, 0 },
2874 { "C", &lang_name_c, 0 },
2875 { "Java", &lang_name_java, 0 },
2876 /* Some of these names have a trailing space so that it is
2877 impossible for them to conflict with names written by users. */
2878 { "__ct ", &ctor_identifier, 1 },
2879 { "__base_ctor ", &base_ctor_identifier, 1 },
2880 { "__comp_ctor ", &complete_ctor_identifier, 1 },
2881 { "__dt ", &dtor_identifier, 1 },
2882 { "__comp_dtor ", &complete_dtor_identifier, 1 },
2883 { "__base_dtor ", &base_dtor_identifier, 1 },
2884 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
2885 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
2886 { "nelts", &nelts_identifier, 0 },
2887 { THIS_NAME, &this_identifier, 0 },
2888 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
2889 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
2890 { "_vptr", &vptr_identifier, 0 },
2891 { "__vtt_parm", &vtt_parm_identifier, 0 },
2892 { "::", &global_scope_name, 0 },
2893 { "std", &std_identifier, 0 },
2897 for (pid = predefined_identifiers; pid->name; ++pid)
2899 *pid->node = get_identifier (pid->name);
2900 if (pid->ctor_or_dtor_p)
2901 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
2905 /* Create the predefined scalar types of C,
2906 and some nodes representing standard constants (0, 1, (void *)0).
2907 Initialize the global binding level.
2908 Make definitions for built-in primitive functions. */
2911 cxx_init_decl_processing (void)
2914 tree void_ftype_ptr;
2916 build_common_tree_nodes (flag_signed_char, false);
2918 /* Create all the identifiers we need. */
2919 initialize_predefined_identifiers ();
2921 /* Create the global variables. */
2922 push_to_top_level ();
2924 current_function_decl = NULL_TREE;
2925 current_binding_level = NULL;
2926 /* Enter the global namespace. */
2927 gcc_assert (global_namespace == NULL_TREE);
2928 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
2930 begin_scope (sk_namespace, global_namespace);
2932 current_lang_name = NULL_TREE;
2934 /* Adjust various flags based on command-line settings. */
2935 if (!flag_permissive)
2936 flag_pedantic_errors = 1;
2937 if (!flag_no_inline)
2939 flag_inline_trees = 1;
2942 if (flag_inline_functions)
2943 flag_inline_trees = 2;
2945 /* Force minimum function alignment if using the least significant
2946 bit of function pointers to store the virtual bit. */
2947 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
2948 && force_align_functions_log < 1)
2949 force_align_functions_log = 1;
2952 current_lang_name = lang_name_c;
2954 error_mark_list = build_tree_list (error_mark_node, error_mark_node);
2955 TREE_TYPE (error_mark_list) = error_mark_node;
2957 /* Create the `std' namespace. */
2958 push_namespace (std_identifier);
2959 std_node = current_namespace;
2962 c_common_nodes_and_builtins ();
2964 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
2965 java_short_type_node = record_builtin_java_type ("__java_short", 16);
2966 java_int_type_node = record_builtin_java_type ("__java_int", 32);
2967 java_long_type_node = record_builtin_java_type ("__java_long", 64);
2968 java_float_type_node = record_builtin_java_type ("__java_float", -32);
2969 java_double_type_node = record_builtin_java_type ("__java_double", -64);
2970 java_char_type_node = record_builtin_java_type ("__java_char", -16);
2971 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
2973 integer_two_node = build_int_cst (NULL_TREE, 2);
2974 integer_three_node = build_int_cst (NULL_TREE, 3);
2976 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
2977 truthvalue_type_node = boolean_type_node;
2978 truthvalue_false_node = boolean_false_node;
2979 truthvalue_true_node = boolean_true_node;
2981 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
2984 record_builtin_type (RID_MAX, NULL, string_type_node);
2987 delta_type_node = ptrdiff_type_node;
2988 vtable_index_type = ptrdiff_type_node;
2990 vtt_parm_type = build_pointer_type (const_ptr_type_node);
2991 void_ftype = build_function_type (void_type_node, void_list_node);
2992 void_ftype_ptr = build_function_type (void_type_node,
2993 tree_cons (NULL_TREE,
2997 = build_exception_variant (void_ftype_ptr, empty_except_spec);
2999 /* C++ extensions */
3001 unknown_type_node = make_node (UNKNOWN_TYPE);
3002 record_unknown_type (unknown_type_node, "unknown type");
3004 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3005 TREE_TYPE (unknown_type_node) = unknown_type_node;
3007 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3009 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
3010 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
3013 /* Make sure we get a unique function type, so we can give
3014 its pointer type a name. (This wins for gdb.) */
3015 tree vfunc_type = make_node (FUNCTION_TYPE);
3016 TREE_TYPE (vfunc_type) = integer_type_node;
3017 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
3018 layout_type (vfunc_type);
3020 vtable_entry_type = build_pointer_type (vfunc_type);
3022 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
3025 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
3026 layout_type (vtbl_type_node);
3027 vtbl_type_node = build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
3028 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
3029 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
3030 layout_type (vtbl_ptr_type_node);
3031 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
3033 push_namespace (get_identifier ("__cxxabiv1"));
3034 abi_node = current_namespace;
3037 global_type_node = make_node (LANG_TYPE);
3038 record_unknown_type (global_type_node, "global type");
3041 current_lang_name = lang_name_cplusplus;
3045 tree bad_alloc_type_node;
3046 tree bad_alloc_decl;
3047 tree newtype, deltype;
3048 tree ptr_ftype_sizetype;
3050 push_namespace (std_identifier);
3051 bad_alloc_id = get_identifier ("bad_alloc");
3052 bad_alloc_type_node = make_aggr_type (RECORD_TYPE);
3053 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3055 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3056 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3057 TYPE_STUB_DECL (bad_alloc_type_node) = bad_alloc_decl;
3061 = build_function_type (ptr_type_node,
3062 tree_cons (NULL_TREE,
3065 newtype = build_exception_variant
3066 (ptr_ftype_sizetype, add_exception_specifier
3067 (NULL_TREE, bad_alloc_type_node, -1));
3068 deltype = build_exception_variant (void_ftype_ptr, empty_except_spec);
3069 push_cp_library_fn (NEW_EXPR, newtype);
3070 push_cp_library_fn (VEC_NEW_EXPR, newtype);
3071 global_delete_fndecl = push_cp_library_fn (DELETE_EXPR, deltype);
3072 push_cp_library_fn (VEC_DELETE_EXPR, deltype);
3076 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype);
3078 /* Perform other language dependent initializations. */
3079 init_class_processing ();
3080 init_rtti_processing ();
3082 if (flag_exceptions)
3083 init_exception_processing ();
3085 if (! supports_one_only ())
3088 make_fname_decl = cp_make_fname_decl;
3089 start_fname_decls ();
3091 /* Show we use EH for cleanups. */
3092 if (flag_exceptions)
3093 using_eh_for_cleanups ();
3096 /* Generate an initializer for a function naming variable from
3097 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
3098 filled in with the type of the init. */
3101 cp_fname_init (const char* name, tree *type_p)
3103 tree domain = NULL_TREE;
3105 tree init = NULL_TREE;
3110 length = strlen (name);
3111 domain = build_index_type (size_int (length));
3112 init = build_string (length + 1, name);
3115 type = build_qualified_type (char_type_node, TYPE_QUAL_CONST);
3116 type = build_cplus_array_type (type, domain);
3121 TREE_TYPE (init) = type;
3123 init = error_mark_node;
3128 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
3129 decl, NAME is the initialization string and TYPE_DEP indicates whether
3130 NAME depended on the type of the function. We make use of that to detect
3131 __PRETTY_FUNCTION__ inside a template fn. This is being done
3132 lazily at the point of first use, so we mustn't push the decl now. */
3135 cp_make_fname_decl (tree id, int type_dep)
3137 const char *const name = (type_dep && processing_template_decl
3138 ? NULL : fname_as_string (type_dep));
3140 tree init = cp_fname_init (name, &type);
3141 tree decl = build_decl (VAR_DECL, id, type);
3144 free ((char *) name);
3146 /* As we're using pushdecl_with_scope, we must set the context. */
3147 DECL_CONTEXT (decl) = current_function_decl;
3148 DECL_PRETTY_FUNCTION_P (decl) = type_dep;
3150 TREE_STATIC (decl) = 1;
3151 TREE_READONLY (decl) = 1;
3152 DECL_ARTIFICIAL (decl) = 1;
3153 DECL_INITIAL (decl) = init;
3155 TREE_USED (decl) = 1;
3157 if (current_function_decl)
3159 struct cp_binding_level *b = current_binding_level;
3160 while (b->level_chain->kind != sk_function_parms)
3162 pushdecl_with_scope (decl, b, /*is_friend=*/false);
3163 cp_finish_decl (decl, init, NULL_TREE, LOOKUP_ONLYCONVERTING);
3166 pushdecl_top_level_and_finish (decl, init);
3171 /* Make a definition for a builtin function named NAME in the current
3172 namespace, whose data type is TYPE and whose context is CONTEXT.
3173 TYPE should be a function type with argument types.
3175 CLASS and CODE tell later passes how to compile calls to this function.
3176 See tree.h for possible values.
3178 If LIBNAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3179 the name to be called if we can't opencode the function.
3180 If ATTRS is nonzero, use that for the function's attribute
3184 builtin_function_1 (const char* name,
3187 enum built_in_function code,
3188 enum built_in_class class,
3189 const char* libname,
3192 tree decl = build_library_fn_1 (get_identifier (name), ERROR_MARK, type);
3193 DECL_BUILT_IN_CLASS (decl) = class;
3194 DECL_FUNCTION_CODE (decl) = code;
3195 DECL_CONTEXT (decl) = context;
3199 /* Since `pushdecl' relies on DECL_ASSEMBLER_NAME instead of DECL_NAME,
3200 we cannot change DECL_ASSEMBLER_NAME until we have installed this
3201 function in the namespace. */
3203 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (libname));
3205 /* A function in the user's namespace should have an explicit
3206 declaration before it is used. Mark the built-in function as
3207 anticipated but not actually declared. */
3208 if (name[0] != '_' || name[1] != '_')
3209 DECL_ANTICIPATED (decl) = 1;
3211 /* Possibly apply some default attributes to this built-in function. */
3213 decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
3215 decl_attributes (&decl, NULL_TREE, 0);
3220 /* Entry point for the benefit of c_common_nodes_and_builtins.
3222 Make a definition for a builtin function named NAME and whose data type
3223 is TYPE. TYPE should be a function type with argument types. This
3224 function places the anticipated declaration in the global namespace
3225 and additionally in the std namespace if appropriate.
3227 CLASS and CODE tell later passes how to compile calls to this function.
3228 See tree.h for possible values.
3230 If LIBNAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3231 the name to be called if we can't opencode the function.
3233 If ATTRS is nonzero, use that for the function's attribute
3237 builtin_function (const char* name,
3240 enum built_in_class cl,
3241 const char* libname,
3244 /* All builtins that don't begin with an '_' should additionally
3245 go in the 'std' namespace. */
3248 push_namespace (std_identifier);
3249 builtin_function_1 (name, type, std_node, code, cl, libname, attrs);
3253 return builtin_function_1 (name, type, NULL_TREE, code,
3254 cl, libname, attrs);
3257 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
3258 function. Not called directly. */
3261 build_library_fn_1 (tree name, enum tree_code operator_code, tree type)
3263 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
3264 DECL_EXTERNAL (fn) = 1;
3265 TREE_PUBLIC (fn) = 1;
3266 DECL_ARTIFICIAL (fn) = 1;
3267 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
3268 SET_DECL_LANGUAGE (fn, lang_c);
3269 /* Runtime library routines are, by definition, available in an
3270 external shared object. */
3271 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
3272 DECL_VISIBILITY_SPECIFIED (fn) = 1;
3276 /* Returns the _DECL for a library function with C linkage.
3277 We assume that such functions never throw; if this is incorrect,
3278 callers should unset TREE_NOTHROW. */
3281 build_library_fn (tree name, tree type)
3283 tree fn = build_library_fn_1 (name, ERROR_MARK, type);
3284 TREE_NOTHROW (fn) = 1;
3288 /* Returns the _DECL for a library function with C++ linkage. */
3291 build_cp_library_fn (tree name, enum tree_code operator_code, tree type)
3293 tree fn = build_library_fn_1 (name, operator_code, type);
3294 TREE_NOTHROW (fn) = TYPE_NOTHROW_P (type);
3295 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
3296 SET_DECL_LANGUAGE (fn, lang_cplusplus);
3300 /* Like build_library_fn, but takes a C string instead of an
3304 build_library_fn_ptr (const char* name, tree type)
3306 return build_library_fn (get_identifier (name), type);
3309 /* Like build_cp_library_fn, but takes a C string instead of an
3313 build_cp_library_fn_ptr (const char* name, tree type)
3315 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type);
3318 /* Like build_library_fn, but also pushes the function so that we will
3319 be able to find it via IDENTIFIER_GLOBAL_VALUE. */
3322 push_library_fn (tree name, tree type)
3324 tree fn = build_library_fn (name, type);
3325 pushdecl_top_level (fn);
3329 /* Like build_cp_library_fn, but also pushes the function so that it
3330 will be found by normal lookup. */
3333 push_cp_library_fn (enum tree_code operator_code, tree type)
3335 tree fn = build_cp_library_fn (ansi_opname (operator_code),
3342 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
3346 push_void_library_fn (tree name, tree parmtypes)
3348 tree type = build_function_type (void_type_node, parmtypes);
3349 return push_library_fn (name, type);
3352 /* Like push_library_fn, but also note that this function throws
3353 and does not return. Used for __throw_foo and the like. */
3356 push_throw_library_fn (tree name, tree type)
3358 tree fn = push_library_fn (name, type);
3359 TREE_THIS_VOLATILE (fn) = 1;
3360 TREE_NOTHROW (fn) = 0;
3364 /* When we call finish_struct for an anonymous union, we create
3365 default copy constructors and such. But, an anonymous union
3366 shouldn't have such things; this function undoes the damage to the
3367 anonymous union type T.
3369 (The reason that we create the synthesized methods is that we don't
3370 distinguish `union { int i; }' from `typedef union { int i; } U'.
3371 The first is an anonymous union; the second is just an ordinary
3375 fixup_anonymous_aggr (tree t)
3379 /* Wipe out memory of synthesized methods. */
3380 TYPE_HAS_CONSTRUCTOR (t) = 0;
3381 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
3382 TYPE_HAS_INIT_REF (t) = 0;
3383 TYPE_HAS_CONST_INIT_REF (t) = 0;
3384 TYPE_HAS_ASSIGN_REF (t) = 0;
3385 TYPE_HAS_CONST_ASSIGN_REF (t) = 0;
3387 /* Splice the implicitly generated functions out of the TYPE_METHODS
3389 q = &TYPE_METHODS (t);
3392 if (DECL_ARTIFICIAL (*q))
3393 *q = TREE_CHAIN (*q);
3395 q = &TREE_CHAIN (*q);
3398 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
3399 if (TYPE_METHODS (t))
3400 error ("%Jan anonymous union cannot have function members",
3401 TYPE_MAIN_DECL (t));
3403 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
3404 assignment operators (because they cannot have these methods themselves).
3405 For anonymous unions this is already checked because they are not allowed
3406 in any union, otherwise we have to check it. */
3407 if (TREE_CODE (t) != UNION_TYPE)
3411 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
3412 if (TREE_CODE (field) == FIELD_DECL)
3414 type = TREE_TYPE (field);
3415 if (CLASS_TYPE_P (type))
3417 if (TYPE_NEEDS_CONSTRUCTING (type))
3418 error ("member %q+#D with constructor not allowed "
3419 "in anonymous aggregate", field);
3420 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
3421 error ("member %q+#D with destructor not allowed "
3422 "in anonymous aggregate", field);
3423 if (TYPE_HAS_COMPLEX_ASSIGN_REF (type))
3424 error ("member %q+#D with copy assignment operator "
3425 "not allowed in anonymous aggregate", field);
3431 /* Make sure that a declaration with no declarator is well-formed, i.e.
3432 just declares a tagged type or anonymous union.
3434 Returns the type declared; or NULL_TREE if none. */
3437 check_tag_decl (cp_decl_specifier_seq *declspecs)
3439 int saw_friend = declspecs->specs[(int)ds_friend] != 0;
3440 int saw_typedef = declspecs->specs[(int)ds_typedef] != 0;
3441 /* If a class, struct, or enum type is declared by the DECLSPECS
3442 (i.e, if a class-specifier, enum-specifier, or non-typename
3443 elaborated-type-specifier appears in the DECLSPECS),
3444 DECLARED_TYPE is set to the corresponding type. */
3445 tree declared_type = NULL_TREE;
3446 bool error_p = false;
3448 if (declspecs->multiple_types_p)
3449 error ("multiple types in one declaration");
3450 else if (declspecs->redefined_builtin_type)
3452 if (!in_system_header)
3453 pedwarn ("redeclaration of C++ built-in type %qT",
3454 declspecs->redefined_builtin_type);
3459 && TYPE_P (declspecs->type)
3460 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
3461 && IS_AGGR_TYPE (declspecs->type))
3462 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
3463 declared_type = declspecs->type;
3464 else if (declspecs->type == error_mark_node)
3466 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
3467 pedwarn ("declaration does not declare anything");
3468 /* Check for an anonymous union. */
3469 else if (declared_type && IS_AGGR_TYPE_CODE (TREE_CODE (declared_type))
3470 && TYPE_ANONYMOUS_P (declared_type))
3472 /* 7/3 In a simple-declaration, the optional init-declarator-list
3473 can be omitted only when declaring a class (clause 9) or
3474 enumeration (7.2), that is, when the decl-specifier-seq contains
3475 either a class-specifier, an elaborated-type-specifier with
3476 a class-key (9.1), or an enum-specifier. In these cases and
3477 whenever a class-specifier or enum-specifier is present in the
3478 decl-specifier-seq, the identifiers in these specifiers are among
3479 the names being declared by the declaration (as class-name,
3480 enum-names, or enumerators, depending on the syntax). In such
3481 cases, and except for the declaration of an unnamed bit-field (9.6),
3482 the decl-specifier-seq shall introduce one or more names into the
3483 program, or shall redeclare a name introduced by a previous
3484 declaration. [Example:
3485 enum { }; // ill-formed
3486 typedef class { }; // ill-formed
3490 error ("missing type-name in typedef-declaration");
3493 /* Anonymous unions are objects, so they can have specifiers. */;
3494 SET_ANON_AGGR_TYPE_P (declared_type);
3496 if (TREE_CODE (declared_type) != UNION_TYPE && pedantic
3497 && !in_system_header)
3498 pedwarn ("ISO C++ prohibits anonymous structs");
3503 if (declspecs->specs[(int)ds_inline]
3504 || declspecs->specs[(int)ds_virtual])
3505 error ("%qs can only be specified for functions",
3506 declspecs->specs[(int)ds_inline]
3507 ? "inline" : "virtual");
3509 && (!current_class_type
3510 || current_scope () != current_class_type))
3511 error ("%<friend%> can only be specified inside a class");
3512 else if (declspecs->specs[(int)ds_explicit])
3513 error ("%<explicit%> can only be specified for constructors");
3514 else if (declspecs->storage_class)
3515 error ("a storage class can only be specified for objects "
3517 else if (declspecs->specs[(int)ds_const]
3518 || declspecs->specs[(int)ds_volatile]
3519 || declspecs->specs[(int)ds_restrict]
3520 || declspecs->specs[(int)ds_thread])
3521 error ("qualifiers can only be specified for objects "
3525 return declared_type;
3528 /* Called when a declaration is seen that contains no names to declare.
3529 If its type is a reference to a structure, union or enum inherited
3530 from a containing scope, shadow that tag name for the current scope
3531 with a forward reference.
3532 If its type defines a new named structure or union
3533 or defines an enum, it is valid but we need not do anything here.
3534 Otherwise, it is an error.
3536 C++: may have to grok the declspecs to learn about static,
3537 complain for anonymous unions.
3539 Returns the TYPE declared -- or NULL_TREE if none. */
3542 shadow_tag (cp_decl_specifier_seq *declspecs)
3544 tree t = check_tag_decl (declspecs);
3549 if (declspecs->attributes)
3551 warning (0, "attribute ignored in declaration of %q+#T", t);
3552 warning (0, "attribute for %q+#T must follow the %qs keyword",
3553 t, class_key_or_enum_as_string (t));
3557 maybe_process_partial_specialization (t);
3559 /* This is where the variables in an anonymous union are
3560 declared. An anonymous union declaration looks like:
3562 because there is no declarator after the union, the parser
3563 sends that declaration here. */
3564 if (ANON_AGGR_TYPE_P (t))
3566 fixup_anonymous_aggr (t);
3568 if (TYPE_FIELDS (t))
3570 tree decl = grokdeclarator (/*declarator=*/NULL,
3571 declspecs, NORMAL, 0, NULL);
3572 finish_anon_union (decl);
3579 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3582 groktypename (cp_decl_specifier_seq *type_specifiers,
3583 const cp_declarator *declarator)
3587 attrs = type_specifiers->attributes;
3588 type_specifiers->attributes = NULL_TREE;
3589 type = grokdeclarator (declarator, type_specifiers, TYPENAME, 0, &attrs);
3591 cplus_decl_attributes (&type, attrs, 0);
3595 /* Decode a declarator in an ordinary declaration or data definition.
3596 This is called as soon as the type information and variable name
3597 have been parsed, before parsing the initializer if any.
3598 Here we create the ..._DECL node, fill in its type,
3599 and put it on the list of decls for the current context.
3600 The ..._DECL node is returned as the value.
3602 Exception: for arrays where the length is not specified,
3603 the type is left null, to be filled in by `cp_finish_decl'.
3605 Function definitions do not come here; they go to start_function
3606 instead. However, external and forward declarations of functions
3607 do go through here. Structure field declarations are done by
3608 grokfield and not through here. */
3611 start_decl (const cp_declarator *declarator,
3612 cp_decl_specifier_seq *declspecs,
3615 tree prefix_attributes,
3616 tree *pushed_scope_p)
3622 *pushed_scope_p = NULL_TREE;
3624 /* This should only be done once on the top most decl. */
3625 if (have_extern_spec)
3627 declspecs->storage_class = sc_extern;
3628 have_extern_spec = false;
3631 /* An object declared as __attribute__((deprecated)) suppresses
3632 warnings of uses of other deprecated items. */
3633 if (lookup_attribute ("deprecated", attributes))
3634 deprecated_state = DEPRECATED_SUPPRESS;
3636 attributes = chainon (attributes, prefix_attributes);
3638 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
3641 deprecated_state = DEPRECATED_NORMAL;
3643 if (decl == NULL_TREE || TREE_CODE (decl) == VOID_TYPE)
3644 return error_mark_node;
3646 type = TREE_TYPE (decl);
3648 if (type == error_mark_node)
3649 return error_mark_node;
3651 context = DECL_CONTEXT (decl);
3655 *pushed_scope_p = push_scope (context);
3657 /* We are only interested in class contexts, later. */
3658 if (TREE_CODE (context) == NAMESPACE_DECL)
3659 context = NULL_TREE;
3663 /* Is it valid for this decl to have an initializer at all?
3664 If not, set INITIALIZED to zero, which will indirectly
3665 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
3666 switch (TREE_CODE (decl))
3669 error ("typedef %qD is initialized (use __typeof__ instead)", decl);
3674 error ("function %q#D is initialized like a variable", decl);
3684 if (! toplevel_bindings_p ()
3685 && DECL_EXTERNAL (decl))
3686 warning (0, "declaration of %q#D has %<extern%> and is initialized",
3688 DECL_EXTERNAL (decl) = 0;
3689 if (toplevel_bindings_p ())
3690 TREE_STATIC (decl) = 1;
3692 /* Tell `pushdecl' this is an initialized decl
3693 even though we don't yet have the initializer expression.
3694 Also tell `cp_finish_decl' it may store the real initializer. */
3695 DECL_INITIAL (decl) = error_mark_node;
3698 /* Set attributes here so if duplicate decl, will have proper attributes. */
3699 cplus_decl_attributes (&decl, attributes, 0);
3701 /* If #pragma weak was used, mark the decl weak now. */
3702 maybe_apply_pragma_weak (decl);
3704 if (TREE_CODE (decl) == FUNCTION_DECL
3705 && DECL_DECLARED_INLINE_P (decl)
3706 && DECL_UNINLINABLE (decl)
3707 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
3708 warning (0, "inline function %q+D given attribute noinline", decl);
3710 if (context && COMPLETE_TYPE_P (complete_type (context)))
3712 if (TREE_CODE (decl) == VAR_DECL)
3714 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
3715 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
3716 error ("%q#D is not a static member of %q#T", decl, context);
3719 if (DECL_CONTEXT (field) != context)
3721 if (!same_type_p (DECL_CONTEXT (field), context))
3722 pedwarn ("ISO C++ does not permit %<%T::%D%> "
3723 "to be defined as %<%T::%D%>",
3724 DECL_CONTEXT (field), DECL_NAME (decl),
3725 context, DECL_NAME (decl));
3726 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
3728 if (processing_specialization
3729 && template_class_depth (context) == 0
3730 && CLASSTYPE_TEMPLATE_SPECIALIZATION (context))
3731 error ("template header not allowed in member definition "
3732 "of explicitly specialized class");
3733 /* Static data member are tricky; an in-class initialization
3734 still doesn't provide a definition, so the in-class
3735 declaration will have DECL_EXTERNAL set, but will have an
3736 initialization. Thus, duplicate_decls won't warn
3737 about this situation, and so we check here. */
3738 if (DECL_INITIAL (decl)
3739 && DECL_INITIALIZED_IN_CLASS_P (field))
3740 error ("duplicate initialization of %qD", decl);
3741 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
3747 tree field = check_classfn (context, decl,
3748 (processing_template_decl
3749 > template_class_depth (context))
3750 ? current_template_parms
3752 if (field && duplicate_decls (decl, field,
3753 /*newdecl_is_friend=*/false))
3757 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
3758 DECL_IN_AGGR_P (decl) = 0;
3759 /* Do not mark DECL as an explicit specialization if it was not
3760 already marked as an instantiation; a declaration should
3761 never be marked as a specialization unless we know what
3762 template is being specialized. */
3763 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
3765 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
3767 /* [temp.expl.spec] An explicit specialization of a static data
3768 member of a template is a definition if the declaration
3769 includes an initializer; otherwise, it is a declaration.
3771 We check for processing_specialization so this only applies
3772 to the new specialization syntax. */
3773 if (!DECL_INITIAL (decl)
3774 && processing_specialization)
3775 DECL_EXTERNAL (decl) = 1;
3778 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl))
3779 pedwarn ("declaration of %q#D outside of class is not definition",
3783 /* Enter this declaration into the symbol table. */
3784 tem = maybe_push_decl (decl);
3786 if (processing_template_decl)
3787 tem = push_template_decl (tem);
3788 if (tem == error_mark_node)
3789 return error_mark_node;
3791 #if ! defined (ASM_OUTPUT_BSS) && ! defined (ASM_OUTPUT_ALIGNED_BSS)
3792 /* Tell the back-end to use or not use .common as appropriate. If we say
3793 -fconserve-space, we want this to save .data space, at the expense of
3794 wrong semantics. If we say -fno-conserve-space, we want this to
3795 produce errors about redefs; to do this we force variables into the
3797 DECL_COMMON (tem) = ((TREE_CODE (tem) != VAR_DECL
3798 || !DECL_THREAD_LOCAL_P (tem))
3799 && (flag_conserve_space || ! TREE_PUBLIC (tem)));
3802 if (! processing_template_decl)
3809 start_decl_1 (tree decl)
3811 tree type = TREE_TYPE (decl);
3812 int initialized = (DECL_INITIAL (decl) != NULL_TREE);
3814 if (type == error_mark_node)
3818 /* Is it valid for this decl to have an initializer at all?
3819 If not, set INITIALIZED to zero, which will indirectly
3820 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
3822 /* Don't allow initializations for incomplete types except for
3823 arrays which might be completed by the initialization. */
3824 if (COMPLETE_TYPE_P (complete_type (type)))
3825 ; /* A complete type is ok. */
3826 else if (TREE_CODE (type) != ARRAY_TYPE)
3828 error ("variable %q#D has initializer but incomplete type", decl);
3830 type = TREE_TYPE (decl) = error_mark_node;
3832 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
3834 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
3835 error ("elements of array %q#D have incomplete type", decl);
3836 /* else we already gave an error in start_decl. */
3842 && TREE_CODE (decl) != TYPE_DECL
3843 && TREE_CODE (decl) != TEMPLATE_DECL
3844 && type != error_mark_node
3845 && IS_AGGR_TYPE (type)
3846 && ! DECL_EXTERNAL (decl))
3848 if ((! processing_template_decl || ! uses_template_parms (type))
3849 && !COMPLETE_TYPE_P (complete_type (type)))
3851 error ("aggregate %q#D has incomplete type and cannot be defined",
3853 /* Change the type so that assemble_variable will give
3854 DECL an rtl we can live with: (mem (const_int 0)). */
3855 type = TREE_TYPE (decl) = error_mark_node;
3859 /* If any base type in the hierarchy of TYPE needs a constructor,
3860 then we set initialized to 1. This way any nodes which are
3861 created for the purposes of initializing this aggregate
3862 will live as long as it does. This is necessary for global
3863 aggregates which do not have their initializers processed until
3864 the end of the file. */
3865 initialized = TYPE_NEEDS_CONSTRUCTING (type);
3870 DECL_INITIAL (decl) = NULL_TREE;
3872 /* Create a new scope to hold this declaration if necessary.
3873 Whether or not a new scope is necessary cannot be determined
3874 until after the type has been completed; if the type is a
3875 specialization of a class template it is not until after
3876 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
3877 will be set correctly. */
3878 maybe_push_cleanup_level (type);
3881 /* Handle initialization of references. DECL, TYPE, and INIT have the
3882 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
3883 but will be set to a new CLEANUP_STMT if a temporary is created
3884 that must be destroyed subsequently.
3886 Returns an initializer expression to use to initialize DECL, or
3887 NULL if the initialization can be performed statically.
3889 Quotes on semantics can be found in ARM 8.4.3. */
3892 grok_reference_init (tree decl, tree type, tree init, tree *cleanup)
3896 if (init == NULL_TREE)
3898 if ((DECL_LANG_SPECIFIC (decl) == 0
3899 || DECL_IN_AGGR_P (decl) == 0)
3900 && ! DECL_THIS_EXTERN (decl))
3901 error ("%qD declared as reference but not initialized", decl);
3905 if (TREE_CODE (init) == CONSTRUCTOR)
3907 error ("ISO C++ forbids use of initializer list to "
3908 "initialize reference %qD", decl);
3912 if (TREE_CODE (init) == TREE_LIST)
3913 init = build_x_compound_expr_from_list (init, "initializer");
3915 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
3916 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
3917 /* Note: default conversion is only called in very special cases. */
3918 init = decay_conversion (init);
3920 /* Convert INIT to the reference type TYPE. This may involve the
3921 creation of a temporary, whose lifetime must be the same as that
3922 of the reference. If so, a DECL_EXPR for the temporary will be
3923 added just after the DECL_EXPR for DECL. That's why we don't set
3924 DECL_INITIAL for local references (instead assigning to them
3925 explicitly); we need to allow the temporary to be initialized
3927 tmp = initialize_reference (type, init, decl, cleanup);
3929 if (tmp == error_mark_node)
3931 else if (tmp == NULL_TREE)
3933 error ("cannot initialize %qT from %qT", type, TREE_TYPE (init));
3937 if (TREE_STATIC (decl) && !TREE_CONSTANT (tmp))
3940 DECL_INITIAL (decl) = tmp;
3945 /* When parsing `int a[] = {1, 2};' we don't know the size of the
3946 array until we finish parsing the initializer. If that's the
3947 situation we're in, update DECL accordingly. */
3950 maybe_deduce_size_from_array_init (tree decl, tree init)
3952 tree type = TREE_TYPE (decl);
3954 if (TREE_CODE (type) == ARRAY_TYPE
3955 && TYPE_DOMAIN (type) == NULL_TREE
3956 && TREE_CODE (decl) != TYPE_DECL)
3958 /* do_default is really a C-ism to deal with tentative definitions.
3959 But let's leave it here to ease the eventual merge. */
3960 int do_default = !DECL_EXTERNAL (decl);
3961 tree initializer = init ? init : DECL_INITIAL (decl);
3962 int failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
3966 error ("initializer fails to determine size of %qD", decl);
3971 error ("array size missing in %qD", decl);
3972 /* If a `static' var's size isn't known, make it extern as
3973 well as static, so it does not get allocated. If it's not
3974 `static', then don't mark it extern; finish_incomplete_decl
3975 will give it a default size and it will get allocated. */
3976 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
3977 DECL_EXTERNAL (decl) = 1;
3981 error ("zero-size array %qD", decl);
3983 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
3985 layout_decl (decl, 0);
3989 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
3990 any appropriate error messages regarding the layout. */
3993 layout_var_decl (tree decl)
3995 tree type = TREE_TYPE (decl);
3997 /* If we haven't already layed out this declaration, do so now.
3998 Note that we must not call complete type for an external object
3999 because it's type might involve templates that we are not
4000 supposed to instantiate yet. (And it's perfectly valid to say
4001 `extern X x' for some incomplete type `X'.) */
4002 if (!DECL_EXTERNAL (decl))
4003 complete_type (type);
4004 if (!DECL_SIZE (decl)
4005 && TREE_TYPE (decl) != error_mark_node
4006 && (COMPLETE_TYPE_P (type)
4007 || (TREE_CODE (type) == ARRAY_TYPE
4008 && !TYPE_DOMAIN (type)
4009 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
4010 layout_decl (decl, 0);
4012 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
4014 /* An automatic variable with an incomplete type: that is an error.
4015 Don't talk about array types here, since we took care of that
4016 message in grokdeclarator. */
4017 error ("storage size of %qD isn't known", decl);
4018 TREE_TYPE (decl) = error_mark_node;
4021 /* Keep this code around in case we later want to control debug info
4022 based on whether a type is "used". (jason 1999-11-11) */
4024 else if (!DECL_EXTERNAL (decl) && IS_AGGR_TYPE (ttype))
4025 /* Let debugger know it should output info for this type. */
4026 note_debug_info_needed (ttype);
4028 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4029 note_debug_info_needed (DECL_CONTEXT (decl));
4032 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4033 && DECL_SIZE (decl) != NULL_TREE
4034 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4036 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4037 constant_expression_warning (DECL_SIZE (decl));
4039 error ("storage size of %qD isn't constant", decl);
4042 if (TREE_STATIC (decl)
4043 && !DECL_ARTIFICIAL (decl)
4044 && current_function_decl
4045 && DECL_CONTEXT (decl) == current_function_decl)
4046 push_local_name (decl);
4049 /* If a local static variable is declared in an inline function, or if
4050 we have a weak definition, we must endeavor to create only one
4051 instance of the variable at link-time. */
4054 maybe_commonize_var (tree decl)
4056 /* Static data in a function with comdat linkage also has comdat
4058 if (TREE_STATIC (decl)
4059 /* Don't mess with __FUNCTION__. */
4060 && ! DECL_ARTIFICIAL (decl)
4061 && DECL_FUNCTION_SCOPE_P (decl)
4062 /* Unfortunately, import_export_decl has not always been called
4063 before the function is processed, so we cannot simply check
4065 && (DECL_COMDAT (DECL_CONTEXT (decl))
4066 || ((DECL_DECLARED_INLINE_P (DECL_CONTEXT (decl))
4067 || DECL_TEMPLATE_INSTANTIATION (DECL_CONTEXT (decl)))
4068 && TREE_PUBLIC (DECL_CONTEXT (decl)))))
4072 /* With weak symbols, we simply make the variable COMDAT;
4073 that will cause copies in multiple translations units to
4075 comdat_linkage (decl);
4079 if (DECL_INITIAL (decl) == NULL_TREE
4080 || DECL_INITIAL (decl) == error_mark_node)
4082 /* Without weak symbols, we can use COMMON to merge
4083 uninitialized variables. */
4084 TREE_PUBLIC (decl) = 1;
4085 DECL_COMMON (decl) = 1;
4089 /* While for initialized variables, we must use internal
4090 linkage -- which means that multiple copies will not
4092 TREE_PUBLIC (decl) = 0;
4093 DECL_COMMON (decl) = 0;
4094 warning (0, "sorry: semantics of inline function static "
4095 "data %q+#D are wrong (you'll wind up "
4096 "with multiple copies)", decl);
4097 warning (0, "%J you can work around this by removing "
4103 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4104 /* Set it up again; we might have set DECL_INITIAL since the last
4106 comdat_linkage (decl);
4109 /* Issue an error message if DECL is an uninitialized const variable. */
4112 check_for_uninitialized_const_var (tree decl)
4114 tree type = TREE_TYPE (decl);
4116 /* ``Unless explicitly declared extern, a const object does not have
4117 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4119 if (TREE_CODE (decl) == VAR_DECL
4120 && TREE_CODE (type) != REFERENCE_TYPE
4121 && CP_TYPE_CONST_P (type)
4122 && !TYPE_NEEDS_CONSTRUCTING (type)
4123 && !DECL_INITIAL (decl))
4124 error ("uninitialized const %qD", decl);
4128 /* Structure holding the current initializer being processed by reshape_init.
4129 CUR is a pointer to the current element being processed, END is a pointer
4130 after the last element present in the initializer. */
4131 typedef struct reshape_iterator_t
4133 constructor_elt *cur;
4134 constructor_elt *end;
4137 static tree reshape_init_r (tree, reshape_iter *, bool);
4139 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4140 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4141 initialized. If there are no more such fields, the return value
4145 next_initializable_field (tree field)
4148 && (TREE_CODE (field) != FIELD_DECL
4149 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4150 || DECL_ARTIFICIAL (field)))
4151 field = TREE_CHAIN (field);
4156 /* Subroutine of reshape_init_array and reshape_init_vector, which does
4157 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
4158 INTEGER_CST representing the size of the array minus one (the maximum index),
4159 or NULL_TREE if the array was declared without specifying the size. D is
4160 the iterator within the constructor. */
4163 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d)
4166 bool sized_array_p = (max_index != NULL_TREE);
4167 unsigned HOST_WIDE_INT max_index_cst = 0;
4168 unsigned HOST_WIDE_INT index;
4170 /* The initializer for an array is always a CONSTRUCTOR. */
4171 new_init = build_constructor (NULL_TREE, NULL);
4175 if (host_integerp (max_index, 1))
4176 max_index_cst = tree_low_cst (max_index, 1);
4177 /* sizetype is sign extended, not zero extended. */
4179 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
4183 /* Loop until there are no more initializers. */
4185 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
4192 /* Handle array designated initializers (GNU extension). */
4193 if (TREE_CODE (d->cur->index) == IDENTIFIER_NODE)
4195 error ("name %qD used in a GNU-style designated "
4196 "initializer for an array", d->cur->index);
4202 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false);
4203 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), NULL_TREE, elt_init);
4209 /* Subroutine of reshape_init_r, processes the initializers for arrays.
4210 Parameters are the same of reshape_init_r. */
4213 reshape_init_array (tree type, reshape_iter *d)
4215 tree max_index = NULL_TREE;
4217 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
4219 if (TYPE_DOMAIN (type))
4220 max_index = array_type_nelts (type);
4222 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4225 /* Subroutine of reshape_init_r, processes the initializers for vectors.
4226 Parameters are the same of reshape_init_r. */
4229 reshape_init_vector (tree type, reshape_iter *d)
4231 tree max_index = NULL_TREE;
4234 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
4236 if (TREE_CODE (d->cur->value) == CONSTRUCTOR
4237 && TREE_HAS_CONSTRUCTOR (d->cur->value))
4239 tree value = d->cur->value;
4240 if (!same_type_p (TREE_TYPE (value), type))
4242 error ("invalid type %qT as initializer for a vector of type %qT",
4243 TREE_TYPE (d->cur->value), type);
4244 value = error_mark_node;
4250 /* For a vector, the representation type is a struct
4251 containing a single member which is an array of the
4252 appropriate size. */
4253 rtype = TYPE_DEBUG_REPRESENTATION_TYPE (type);
4254 if (rtype && TYPE_DOMAIN (TREE_TYPE (TYPE_FIELDS (rtype))))
4255 max_index = array_type_nelts (TREE_TYPE (TYPE_FIELDS (rtype)));
4257 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4260 /* Subroutine of reshape_init_r, processes the initializers for classes
4261 or union. Parameters are the same of reshape_init_r. */
4264 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p)
4269 gcc_assert (CLASS_TYPE_P (type));
4271 /* The initializer for a class is always a CONSTRUCTOR. */
4272 new_init = build_constructor (NULL_TREE, NULL);
4273 field = next_initializable_field (TYPE_FIELDS (type));
4279 An initializer for an aggregate member that is an
4280 empty class shall have the form of an empty
4281 initializer-list {}. */
4282 if (!first_initializer_p)
4284 error ("initializer for %qT must be brace-enclosed", type);
4285 return error_mark_node;
4290 /* Loop through the initializable fields, gathering initializers. */
4291 while (d->cur != d->end)
4295 /* Handle designated initializers, as an extension. */
4299 pedwarn ("ISO C++ does not allow designated initializers");
4301 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
4303 if (!field || TREE_CODE (field) != FIELD_DECL)
4304 error ("%qT has no non-static data member named %qD", type,
4308 /* If we processed all the member of the class, we are done. */
4312 field_init = reshape_init_r (TREE_TYPE (field), d,
4313 /*first_initializer_p=*/false);
4314 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
4318 When a union is initialized with a brace-enclosed
4319 initializer, the braces shall only contain an
4320 initializer for the first member of the union. */
4321 if (TREE_CODE (type) == UNION_TYPE)
4324 field = next_initializable_field (TREE_CHAIN (field));
4330 /* Subroutine of reshape_init, which processes a single initializer (part of
4331 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
4332 iterator within the CONSTRUCTOR which points to the initializer to process.
4333 FIRST_INITIALIZER_P is true if this is the first initializer of the
4334 CONSTRUCTOR node. */
4337 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p)
4339 tree init = d->cur->value;
4341 /* A non-aggregate type is always initialized with a single
4343 if (!CP_AGGREGATE_TYPE_P (type))
4345 /* It is invalid to initialize a non-aggregate type with a
4346 brace-enclosed initializer.
4347 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
4348 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
4349 a CONSTRUCTOR (with a record type). */
4350 if (TREE_CODE (init) == CONSTRUCTOR
4351 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
4353 error ("braces around scalar initializer for type %qT", type);
4354 init = error_mark_node;
4363 All implicit type conversions (clause _conv_) are considered when
4364 initializing the aggregate member with an initializer from an
4365 initializer-list. If the initializer can initialize a member,
4366 the member is initialized. Otherwise, if the member is itself a
4367 non-empty subaggregate, brace elision is assumed and the
4368 initializer is considered for the initialization of the first
4369 member of the subaggregate. */
4370 if (TREE_CODE (init) != CONSTRUCTOR
4371 && can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL))
4377 /* [dcl.init.string]
4379 A char array (whether plain char, signed char, or unsigned char)
4380 can be initialized by a string-literal (optionally enclosed in
4381 braces); a wchar_t array can be initialized by a wide
4382 string-literal (optionally enclosed in braces). */
4383 if (TREE_CODE (type) == ARRAY_TYPE
4384 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
4386 tree str_init = init;
4388 /* Strip one level of braces if and only if they enclose a single
4389 element (as allowed by [dcl.init.string]). */
4390 if (!first_initializer_p
4391 && TREE_CODE (str_init) == CONSTRUCTOR
4392 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (str_init)) == 1)
4394 str_init = VEC_index (constructor_elt,
4395 CONSTRUCTOR_ELTS (str_init), 0)->value;
4398 /* If it's a string literal, then it's the initializer for the array
4399 as a whole. Otherwise, continue with normal initialization for
4400 array types (one value per array element). */
4401 if (TREE_CODE (str_init) == STRING_CST)
4408 /* The following cases are about aggregates. If we are not within a full
4409 initializer already, and there is not a CONSTRUCTOR, it means that there
4410 is a missing set of braces (that is, we are processing the case for
4411 which reshape_init exists). */
4412 if (!first_initializer_p)
4414 if (TREE_CODE (init) == CONSTRUCTOR)
4416 /* For a nested compound literal, there is no need to reshape since
4417 brace elision is not allowed. Even if we decided to allow it,
4418 we should add a call to reshape_init in finish_compound_literal,
4419 before calling digest_init, so changing this code would still
4420 not be necessary. */
4421 if (!TREE_HAS_CONSTRUCTOR (init))
4424 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
4425 return reshape_init (type, init);
4428 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
4431 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
4435 /* Dispatch to specialized routines. */
4436 if (CLASS_TYPE_P (type))
4437 return reshape_init_class (type, d, first_initializer_p);
4438 else if (TREE_CODE (type) == ARRAY_TYPE)
4439 return reshape_init_array (type, d);
4440 else if (TREE_CODE (type) == VECTOR_TYPE)
4441 return reshape_init_vector (type, d);
4446 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
4447 brace-enclosed aggregate initializer.
4449 INIT is the CONSTRUCTOR containing the list of initializers describing
4450 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
4451 It may not presently match the shape of the TYPE; for example:
4453 struct S { int a; int b; };
4454 struct S a[] = { 1, 2, 3, 4 };
4456 Here INIT will hold a VEC of four elements, rather than a
4457 VEC of two elements, each itself a VEC of two elements. This
4458 routine transforms INIT from the former form into the latter. The
4459 revised CONSTRUCTOR node is returned. */
4462 reshape_init (tree type, tree init)
4464 VEC(constructor_elt, gc) *v;
4468 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
4469 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
4471 v = CONSTRUCTOR_ELTS (init);
4473 /* An empty constructor does not need reshaping, and it is always a valid
4475 if (VEC_empty (constructor_elt, v))
4478 /* Recurse on this CONSTRUCTOR. */
4479 d.cur = VEC_index (constructor_elt, v, 0);
4480 d.end = d.cur + VEC_length (constructor_elt, v);
4482 new_init = reshape_init_r (type, &d, true);
4484 /* Make sure all the element of the constructor were used. Otherwise,
4485 issue an error about exceeding initializers. */
4487 error ("too many initializers for %qT", type);
4492 /* Verify INIT (the initializer for DECL), and record the
4493 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
4494 grok_reference_init.
4496 If the return value is non-NULL, it is an expression that must be
4497 evaluated dynamically to initialize DECL. */
4500 check_initializer (tree decl, tree init, int flags, tree *cleanup)
4502 tree type = TREE_TYPE (decl);
4503 tree init_code = NULL;
4505 /* If `start_decl' didn't like having an initialization, ignore it now. */
4506 if (init != NULL_TREE && DECL_INITIAL (decl) == NULL_TREE)
4509 /* If an initializer is present, DECL_INITIAL has been
4510 error_mark_node, to indicate that an as-of-yet unevaluated
4511 initialization will occur. From now on, DECL_INITIAL reflects
4512 the static initialization -- if any -- of DECL. */
4513 DECL_INITIAL (decl) = NULL_TREE;
4515 /* Things that are going to be initialized need to have complete
4517 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
4519 if (type == error_mark_node)
4520 /* We will have already complained. */
4522 else if (init && COMPLETE_TYPE_P (type)
4523 && !TREE_CONSTANT (TYPE_SIZE (type)))
4525 error ("variable-sized object %qD may not be initialized", decl);
4528 else if (TREE_CODE (type) == ARRAY_TYPE
4529 && !COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4531 error ("elements of array %q#D have incomplete type", decl);
4534 else if (TREE_CODE (type) != ARRAY_TYPE && !COMPLETE_TYPE_P (type))
4536 error ("%qD has incomplete type", decl);
4537 TREE_TYPE (decl) = error_mark_node;
4541 if (TREE_CODE (decl) == CONST_DECL)
4543 gcc_assert (TREE_CODE (decl) != REFERENCE_TYPE);
4545 DECL_INITIAL (decl) = init;
4547 gcc_assert (init != NULL_TREE);
4550 else if (!DECL_EXTERNAL (decl) && TREE_CODE (type) == REFERENCE_TYPE)
4551 init = grok_reference_init (decl, type, init, cleanup);
4554 /* Do not reshape constructors of vectors (they don't need to be
4556 if (TREE_CODE (init) == CONSTRUCTOR
4557 && !TREE_HAS_CONSTRUCTOR (init)
4558 && !TREE_TYPE (init)) /* ptrmemfunc */
4560 init = reshape_init (type, init);
4562 if ((*targetm.vector_opaque_p) (type))
4564 error ("opaque vector types cannot be initialized");
4565 init = error_mark_node;
4569 /* If DECL has an array type without a specific bound, deduce the
4570 array size from the initializer. */
4571 maybe_deduce_size_from_array_init (decl, init);
4572 type = TREE_TYPE (decl);
4574 if (TYPE_HAS_CONSTRUCTOR (type) || TYPE_NEEDS_CONSTRUCTING (type))
4576 if (TREE_CODE (type) == ARRAY_TYPE)
4577 goto initialize_aggr;
4578 else if (TREE_CODE (init) == CONSTRUCTOR)
4580 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
4581 if (TYPE_NON_AGGREGATE_CLASS (type))
4583 error ("%qD must be initialized by constructor, "
4586 init = error_mark_node;
4589 goto dont_use_constructor;
4593 int saved_stmts_are_full_exprs_p;
4596 saved_stmts_are_full_exprs_p = 0;
4597 if (building_stmt_tree ())
4599 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
4600 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
4602 init = build_aggr_init (decl, init, flags);
4603 if (building_stmt_tree ())
4604 current_stmt_tree ()->stmts_are_full_exprs_p =
4605 saved_stmts_are_full_exprs_p;
4611 dont_use_constructor:
4612 if (TREE_CODE (init) != TREE_VEC)
4614 init_code = store_init_value (decl, init);
4615 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
4616 && DECL_INITIAL (decl)
4617 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
4618 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
4619 warning (0, "array %qD initialized by parenthesized string literal %qE",
4620 decl, DECL_INITIAL (decl));
4625 else if (DECL_EXTERNAL (decl))
4627 else if (TYPE_P (type) && TYPE_NEEDS_CONSTRUCTING (type))
4628 goto initialize_aggr;
4629 else if (IS_AGGR_TYPE (type))
4631 tree core_type = strip_array_types (type);
4633 if (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type))
4634 error ("structure %qD with uninitialized const members", decl);
4635 if (CLASSTYPE_REF_FIELDS_NEED_INIT (core_type))
4636 error ("structure %qD with uninitialized reference members", decl);
4638 check_for_uninitialized_const_var (decl);
4641 check_for_uninitialized_const_var (decl);
4643 if (init && init != error_mark_node)
4644 init_code = build2 (INIT_EXPR, type, decl, init);
4649 /* If DECL is not a local variable, give it RTL. */
4652 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
4654 int toplev = toplevel_bindings_p ();
4656 const char *filename;
4658 /* Set the DECL_ASSEMBLER_NAME for the object. */
4661 /* The `register' keyword, when used together with an
4662 asm-specification, indicates that the variable should be
4663 placed in a particular register. */
4664 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
4666 set_user_assembler_name (decl, asmspec);
4667 DECL_HARD_REGISTER (decl) = 1;
4671 if (TREE_CODE (decl) == FUNCTION_DECL
4672 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
4673 set_builtin_user_assembler_name (decl, asmspec);
4674 set_user_assembler_name (decl, asmspec);
4678 /* Handle non-variables up front. */
4679 if (TREE_CODE (decl) != VAR_DECL)
4681 rest_of_decl_compilation (decl, toplev, at_eof);
4685 /* If we see a class member here, it should be a static data
4687 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
4689 gcc_assert (TREE_STATIC (decl));
4690 /* An in-class declaration of a static data member should be
4691 external; it is only a declaration, and not a definition. */
4692 if (init == NULL_TREE)
4693 gcc_assert (DECL_EXTERNAL (decl));
4696 /* We don't create any RTL for local variables. */
4697 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
4700 /* We defer emission of local statics until the corresponding
4701 DECL_EXPR is expanded. */
4702 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
4704 /* We try to defer namespace-scope static constants so that they are
4705 not emitted into the object file unnecessarily. */
4706 filename = input_filename;
4707 if (!DECL_VIRTUAL_P (decl)
4708 && TREE_READONLY (decl)
4709 && DECL_INITIAL (decl) != NULL_TREE
4710 && DECL_INITIAL (decl) != error_mark_node
4712 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
4714 && !TREE_PUBLIC (decl))
4716 /* Fool with the linkage of static consts according to #pragma
4718 struct c_fileinfo *finfo = get_fileinfo (lbasename (filename));
4719 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
4721 TREE_PUBLIC (decl) = 1;
4722 DECL_EXTERNAL (decl) = finfo->interface_only;
4727 /* Likewise for template instantiations. */
4728 else if (DECL_LANG_SPECIFIC (decl)
4729 && DECL_IMPLICIT_INSTANTIATION (decl))
4732 /* If we're not deferring, go ahead and assemble the variable. */
4734 rest_of_decl_compilation (decl, toplev, at_eof);
4737 /* Generate code to initialize DECL (a local variable). */
4740 initialize_local_var (tree decl, tree init)
4742 tree type = TREE_TYPE (decl);
4745 gcc_assert (TREE_CODE (decl) == VAR_DECL
4746 || TREE_CODE (decl) == RESULT_DECL);
4747 gcc_assert (!TREE_STATIC (decl));
4749 if (DECL_SIZE (decl) == NULL_TREE)
4751 /* If we used it already as memory, it must stay in memory. */
4752 DECL_INITIAL (decl) = NULL_TREE;
4753 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
4756 if (DECL_SIZE (decl) && type != error_mark_node)
4760 /* Compute and store the initial value. */
4761 already_used = TREE_USED (decl) || TREE_USED (type);
4763 /* Perform the initialization. */
4766 int saved_stmts_are_full_exprs_p;
4768 gcc_assert (building_stmt_tree ());
4769 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
4770 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
4771 finish_expr_stmt (init);
4772 current_stmt_tree ()->stmts_are_full_exprs_p =
4773 saved_stmts_are_full_exprs_p;
4776 /* Set this to 0 so we can tell whether an aggregate which was
4777 initialized was ever used. Don't do this if it has a
4778 destructor, so we don't complain about the 'resource
4779 allocation is initialization' idiom. Now set
4780 attribute((unused)) on types so decls of that type will be
4781 marked used. (see TREE_USED, above.) */
4782 if (TYPE_NEEDS_CONSTRUCTING (type)
4784 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
4785 && DECL_NAME (decl))
4786 TREE_USED (decl) = 0;
4787 else if (already_used)
4788 TREE_USED (decl) = 1;
4791 /* Generate a cleanup, if necessary. */
4792 cleanup = cxx_maybe_build_cleanup (decl);
4793 if (DECL_SIZE (decl) && cleanup)
4794 finish_decl_cleanup (decl, cleanup);
4797 /* DECL is a VAR_DECL for a compiler-generated variable with static
4798 storage duration (like a virtual table) whose initializer is a
4799 compile-time constant. Initialize the variable and provide it to
4803 initialize_artificial_var (tree decl, tree init)
4805 DECL_INITIAL (decl) = build_constructor_from_list (NULL_TREE, init);
4806 DECL_INITIALIZED_P (decl) = 1;
4807 determine_visibility (decl);
4808 layout_var_decl (decl);
4809 maybe_commonize_var (decl);
4810 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
4813 /* Finish processing of a declaration;
4814 install its line number and initial value.
4815 If the length of an array type is not known before,
4816 it must be determined now, from the initial value, or it is an error.
4818 INIT holds the value of an initializer that should be allowed to escape
4821 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
4822 if the (init) syntax was used. */
4825 cp_finish_decl (tree decl, tree init, tree asmspec_tree, int flags)
4829 const char *asmspec = NULL;
4830 int was_readonly = 0;
4831 bool var_definition_p = false;
4833 if (decl == error_mark_node)
4838 error ("assignment (not initialization) in declaration");
4842 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
4844 /* Assume no cleanup is required. */
4845 cleanup = NULL_TREE;
4847 /* If a name was specified, get the string. */
4848 if (global_scope_p (current_binding_level))
4849 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
4851 asmspec = TREE_STRING_POINTER (asmspec_tree);
4853 if (init && TREE_CODE (init) == NAMESPACE_DECL)
4855 error ("cannot initialize %qD to namespace %qD", decl, init);
4859 if (current_class_type
4860 && CP_DECL_CONTEXT (decl) == current_class_type
4861 && TYPE_BEING_DEFINED (current_class_type)
4862 && (DECL_INITIAL (decl) || init))
4863 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
4865 type = TREE_TYPE (decl);
4867 if (type == error_mark_node)
4870 if (processing_template_decl)
4872 /* Add this declaration to the statement-tree. */
4873 if (at_function_scope_p ())
4874 add_decl_expr (decl);
4876 if (init && DECL_INITIAL (decl))
4877 DECL_INITIAL (decl) = init;
4878 if (TREE_CODE (decl) == VAR_DECL
4879 && !DECL_PRETTY_FUNCTION_P (decl)
4880 && !dependent_type_p (TREE_TYPE (decl)))
4881 maybe_deduce_size_from_array_init (decl, init);
4886 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
4887 gcc_assert (TREE_CODE (decl) != PARM_DECL);
4889 /* Take care of TYPE_DECLs up front. */
4890 if (TREE_CODE (decl) == TYPE_DECL)
4892 if (type != error_mark_node
4893 && IS_AGGR_TYPE (type) && DECL_NAME (decl))
4895 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
4896 warning (0, "shadowing previous type declaration of %q#D", decl);
4897 set_identifier_type_value (DECL_NAME (decl), decl);
4900 /* If we have installed this as the canonical typedef for this
4901 type, and that type has not been defined yet, delay emitting
4902 the debug information for it, as we will emit it later. */
4903 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
4904 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
4905 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
4907 rest_of_decl_compilation (decl, DECL_CONTEXT (decl) == NULL_TREE,
4912 /* A reference will be modified here, as it is initialized. */
4913 if (! DECL_EXTERNAL (decl)
4914 && TREE_READONLY (decl)
4915 && TREE_CODE (type) == REFERENCE_TYPE)
4918 TREE_READONLY (decl) = 0;
4921 if (TREE_CODE (decl) == VAR_DECL)
4923 /* Only PODs can have thread-local storage. Other types may require
4924 various kinds of non-trivial initialization. */
4925 if (DECL_THREAD_LOCAL_P (decl) && !pod_type_p (TREE_TYPE (decl)))
4926 error ("%qD cannot be thread-local because it has non-POD type %qT",
4927 decl, TREE_TYPE (decl));
4928 /* Convert the initializer to the type of DECL, if we have not
4929 already initialized DECL. */
4930 if (!DECL_INITIALIZED_P (decl)
4931 /* If !DECL_EXTERNAL then DECL is being defined. In the
4932 case of a static data member initialized inside the
4933 class-specifier, there can be an initializer even if DECL
4934 is *not* defined. */
4935 && (!DECL_EXTERNAL (decl) || init))
4938 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
4939 init = check_initializer (decl, init, flags, &cleanup);
4940 /* Thread-local storage cannot be dynamically initialized. */
4941 if (DECL_THREAD_LOCAL_P (decl) && init)
4943 error ("%qD is thread-local and so cannot be dynamically "
4944 "initialized", decl);
4948 /* Check that the initializer for a static data member was a
4949 constant. Although we check in the parser that the
4950 initializer is an integral constant expression, we do not
4951 simplify division-by-zero at the point at which it
4952 occurs. Therefore, in:
4954 struct S { static const int i = 7 / 0; };
4956 we issue an error at this point. It would
4957 probably be better to forbid division by zero in
4958 integral constant expressions. */
4959 if (DECL_EXTERNAL (decl) && init)
4961 error ("%qD cannot be initialized by a non-constant expression"
4962 " when being declared", decl);
4963 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
4971 The memory occupied by any object of static storage
4972 duration is zero-initialized at program startup before
4973 any other initialization takes place.
4975 We cannot create an appropriate initializer until after
4976 the type of DECL is finalized. If DECL_INITIAL is set,
4977 then the DECL is statically initialized, and any
4978 necessary zero-initialization has already been performed. */
4979 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
4980 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
4981 /*nelts=*/NULL_TREE,
4982 /*static_storage_p=*/true);
4983 /* Remember that the initialization for this variable has
4985 DECL_INITIALIZED_P (decl) = 1;
4986 /* This declaration is the definition of this variable,
4987 unless we are initializing a static data member within
4988 the class specifier. */
4989 if (!DECL_EXTERNAL (decl))
4990 var_definition_p = true;
4991 /* The variable is being defined, so determine its
4993 determine_visibility (decl);
4995 /* If the variable has an array type, lay out the type, even if
4996 there is no initializer. It is valid to index through the
4997 array, and we must get TYPE_ALIGN set correctly on the array
4999 else if (TREE_CODE (type) == ARRAY_TYPE)
5003 /* Add this declaration to the statement-tree. This needs to happen
5004 after the call to check_initializer so that the DECL_EXPR for a
5005 reference temp is added before the DECL_EXPR for the reference itself. */
5006 if (at_function_scope_p ())
5007 add_decl_expr (decl);
5009 if (TREE_CODE (decl) == VAR_DECL)
5010 layout_var_decl (decl);
5012 /* Output the assembler code and/or RTL code for variables and functions,
5013 unless the type is an undefined structure or union.
5014 If not, it will get done when the type is completed. */
5015 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
5017 if (TREE_CODE (decl) == VAR_DECL)
5018 maybe_commonize_var (decl);
5020 make_rtl_for_nonlocal_decl (decl, init, asmspec);
5022 /* Check for abstractness of the type. Notice that there is no
5023 need to strip array types here since the check for those types
5024 is already done within create_array_type_for_decl. */
5025 if (TREE_CODE (type) == FUNCTION_TYPE
5026 || TREE_CODE (type) == METHOD_TYPE)
5027 abstract_virtuals_error (decl, TREE_TYPE (type));
5029 abstract_virtuals_error (decl, type);
5031 if (TREE_CODE (decl) == FUNCTION_DECL
5032 || TREE_TYPE (decl) == error_mark_node)
5033 /* No initialization required. */
5035 else if (DECL_EXTERNAL (decl)
5036 && ! (DECL_LANG_SPECIFIC (decl)
5037 && DECL_NOT_REALLY_EXTERN (decl)))
5040 DECL_INITIAL (decl) = init;
5044 /* A variable definition. */
5045 if (DECL_FUNCTION_SCOPE_P (decl))
5047 /* Initialize the local variable. */
5048 if (processing_template_decl)
5050 if (init || DECL_INITIAL (decl) == error_mark_node)
5051 DECL_INITIAL (decl) = init;
5053 else if (!TREE_STATIC (decl))
5054 initialize_local_var (decl, init);
5057 /* If a variable is defined, and then a subsequent
5058 definition with external linkage is encountered, we will
5059 get here twice for the same variable. We want to avoid
5060 calling expand_static_init more than once. For variables
5061 that are not static data members, we can call
5062 expand_static_init only when we actually process the
5063 initializer. It is not legal to redeclare a static data
5064 member, so this issue does not arise in that case. */
5065 if (var_definition_p && TREE_STATIC (decl))
5066 expand_static_init (decl, init);
5070 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
5071 reference, insert it in the statement-tree now. */
5073 push_cleanup (decl, cleanup, false);
5078 TREE_READONLY (decl) = 1;
5080 /* If this was marked 'used', be sure it will be output. */
5081 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
5082 mark_decl_referenced (decl);
5085 /* This is here for a midend callback from c-common.c. */
5088 finish_decl (tree decl, tree init, tree asmspec_tree)
5090 cp_finish_decl (decl, init, asmspec_tree, 0);
5093 /* Returns a declaration for a VAR_DECL as if:
5095 extern "C" TYPE NAME;
5097 had been seen. Used to create compiler-generated global
5101 declare_global_var (tree name, tree type)
5105 push_to_top_level ();
5106 decl = build_decl (VAR_DECL, name, type);
5107 TREE_PUBLIC (decl) = 1;
5108 DECL_EXTERNAL (decl) = 1;
5109 DECL_ARTIFICIAL (decl) = 1;
5110 /* If the user has explicitly declared this variable (perhaps
5111 because the code we are compiling is part of a low-level runtime
5112 library), then it is possible that our declaration will be merged
5113 with theirs by pushdecl. */
5114 decl = pushdecl (decl);
5115 cp_finish_decl (decl, NULL_TREE, NULL_TREE, 0);
5116 pop_from_top_level ();
5121 /* Returns a pointer to the `atexit' function. Note that if
5122 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
5123 `__cxa_atexit' function specified in the IA64 C++ ABI. */
5126 get_atexit_node (void)
5133 bool use_aeabi_atexit;
5138 if (flag_use_cxa_atexit)
5140 /* The declaration for `__cxa_atexit' is:
5142 int __cxa_atexit (void (*)(void *), void *, void *)
5144 We build up the argument types and then then function type
5147 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
5148 /* First, build the pointer-to-function type for the first
5150 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
5151 fn_type = build_function_type (void_type_node, arg_types);
5152 fn_ptr_type = build_pointer_type (fn_type);
5153 /* Then, build the rest of the argument types. */
5154 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
5155 if (use_aeabi_atexit)
5157 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
5158 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
5162 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
5163 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
5165 /* And the final __cxa_atexit type. */
5166 fn_type = build_function_type (integer_type_node, arg_types);
5167 fn_ptr_type = build_pointer_type (fn_type);
5168 if (use_aeabi_atexit)
5169 name = "__aeabi_atexit";
5171 name = "__cxa_atexit";
5175 /* The declaration for `atexit' is:
5177 int atexit (void (*)());
5179 We build up the argument types and then then function type
5181 fn_type = build_function_type (void_type_node, void_list_node);
5182 fn_ptr_type = build_pointer_type (fn_type);
5183 arg_types = tree_cons (NULL_TREE, fn_ptr_type, void_list_node);
5184 /* Build the final atexit type. */
5185 fn_type = build_function_type (integer_type_node, arg_types);
5189 /* Now, build the function declaration. */
5190 push_lang_context (lang_name_c);
5191 atexit_fndecl = build_library_fn_ptr (name, fn_type);
5192 mark_used (atexit_fndecl);
5193 pop_lang_context ();
5194 atexit_node = decay_conversion (atexit_fndecl);
5199 /* Returns the __dso_handle VAR_DECL. */
5202 get_dso_handle_node (void)
5204 if (dso_handle_node)
5205 return dso_handle_node;
5207 /* Declare the variable. */
5208 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
5211 return dso_handle_node;
5214 /* Begin a new function with internal linkage whose job will be simply
5215 to destroy some particular variable. */
5217 static GTY(()) int start_cleanup_cnt;
5220 start_cleanup_fn (void)
5227 push_to_top_level ();
5229 /* No need to mangle this. */
5230 push_lang_context (lang_name_c);
5232 /* Build the parameter-types. */
5233 parmtypes = void_list_node;
5234 /* Functions passed to __cxa_atexit take an additional parameter.
5235 We'll just ignore it. After we implement the new calling
5236 convention for destructors, we can eliminate the use of
5237 additional cleanup functions entirely in the -fnew-abi case. */
5238 if (flag_use_cxa_atexit)
5239 parmtypes = tree_cons (NULL_TREE, ptr_type_node, parmtypes);
5240 /* Build the function type itself. */
5241 fntype = build_function_type (void_type_node, parmtypes);
5242 /* Build the name of the function. */
5243 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
5244 /* Build the function declaration. */
5245 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
5246 /* It's a function with internal linkage, generated by the
5248 TREE_PUBLIC (fndecl) = 0;
5249 DECL_ARTIFICIAL (fndecl) = 1;
5250 /* Make the function `inline' so that it is only emitted if it is
5251 actually needed. It is unlikely that it will be inlined, since
5252 it is only called via a function pointer, but we avoid unnecessary
5253 emissions this way. */
5254 DECL_INLINE (fndecl) = 1;
5255 DECL_DECLARED_INLINE_P (fndecl) = 1;
5256 DECL_INTERFACE_KNOWN (fndecl) = 1;
5257 /* Build the parameter. */
5258 if (flag_use_cxa_atexit)
5262 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
5263 DECL_CONTEXT (parmdecl) = fndecl;
5264 TREE_USED (parmdecl) = 1;
5265 DECL_ARGUMENTS (fndecl) = parmdecl;
5269 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
5271 pop_lang_context ();
5273 return current_function_decl;
5276 /* Finish the cleanup function begun by start_cleanup_fn. */
5279 end_cleanup_fn (void)
5281 expand_or_defer_fn (finish_function (0));
5283 pop_from_top_level ();
5286 /* Generate code to handle the destruction of DECL, an object with
5287 static storage duration. */
5290 register_dtor_fn (tree decl)
5297 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
5298 return void_zero_node;
5300 /* Call build_cleanup before we enter the anonymous function so that
5301 any access checks will be done relative to the current scope,
5302 rather than the scope of the anonymous function. */
5303 build_cleanup (decl);
5305 /* Now start the function. */
5306 cleanup = start_cleanup_fn ();
5308 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
5309 to the original function, rather than the anonymous one. That
5310 will make the back-end think that nested functions are in use,
5311 which causes confusion. */
5313 push_deferring_access_checks (dk_no_check);
5314 fcall = build_cleanup (decl);
5315 pop_deferring_access_checks ();
5317 /* Create the body of the anonymous function. */
5318 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
5319 finish_expr_stmt (fcall);
5320 finish_compound_stmt (compound_stmt);
5323 /* Call atexit with the cleanup function. */
5324 cxx_mark_addressable (cleanup);
5325 mark_used (cleanup);
5326 cleanup = build_unary_op (ADDR_EXPR, cleanup, 0);
5327 if (flag_use_cxa_atexit)
5329 args = tree_cons (NULL_TREE,
5330 build_unary_op (ADDR_EXPR, get_dso_handle_node (), 0),
5332 if (targetm.cxx.use_aeabi_atexit ())
5334 args = tree_cons (NULL_TREE, cleanup, args);
5335 args = tree_cons (NULL_TREE, null_pointer_node, args);
5339 args = tree_cons (NULL_TREE, null_pointer_node, args);
5340 args = tree_cons (NULL_TREE, cleanup, args);
5344 args = tree_cons (NULL_TREE, cleanup, NULL_TREE);
5345 return build_function_call (get_atexit_node (), args);
5348 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
5349 is its initializer. Generate code to handle the construction
5350 and destruction of DECL. */
5353 expand_static_init (tree decl, tree init)
5355 gcc_assert (TREE_CODE (decl) == VAR_DECL);
5356 gcc_assert (TREE_STATIC (decl));
5358 /* Some variables require no initialization. */
5360 && !TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))
5361 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
5364 if (DECL_FUNCTION_SCOPE_P (decl))
5366 /* Emit code to perform this initialization but once. */
5367 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
5368 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
5369 tree guard, guard_addr, guard_addr_list;
5370 tree acquire_fn, release_fn, abort_fn;
5373 /* Emit code to perform this initialization but once. This code
5376 static <type> guard;
5377 if (!guard.first_byte) {
5378 if (__cxa_guard_acquire (&guard)) {
5381 // Do initialization.
5382 flag = true; __cxa_guard_release (&guard);
5383 // Register variable for destruction at end of program.
5385 if (!flag) __cxa_guard_abort (&guard);
5389 Note that the `flag' variable is only set to 1 *after* the
5390 initialization is complete. This ensures that an exception,
5391 thrown during the construction, will cause the variable to
5392 reinitialized when we pass through this code again, as per:
5396 If the initialization exits by throwing an exception, the
5397 initialization is not complete, so it will be tried again
5398 the next time control enters the declaration.
5400 This process should be thread-safe, too; multiple threads
5401 should not be able to initialize the variable more than
5404 /* Create the guard variable. */
5405 guard = get_guard (decl);
5407 /* This optimization isn't safe on targets with relaxed memory
5408 consistency. On such targets we force synchronization in
5409 __cxa_guard_acquire. */
5410 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
5412 /* Begin the conditional initialization. */
5413 if_stmt = begin_if_stmt ();
5414 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
5415 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
5418 if (flag_threadsafe_statics)
5420 guard_addr = build_address (guard);
5421 guard_addr_list = build_tree_list (NULL_TREE, guard_addr);
5423 acquire_fn = get_identifier ("__cxa_guard_acquire");
5424 release_fn = get_identifier ("__cxa_guard_release");
5425 abort_fn = get_identifier ("__cxa_guard_abort");
5426 if (!get_global_value_if_present (acquire_fn, &acquire_fn))
5428 tree argtypes = tree_cons (NULL_TREE, TREE_TYPE (guard_addr),
5430 tree vfntype = build_function_type (void_type_node, argtypes);
5431 acquire_fn = push_library_fn
5432 (acquire_fn, build_function_type (integer_type_node, argtypes));
5433 release_fn = push_library_fn (release_fn, vfntype);
5434 abort_fn = push_library_fn (abort_fn, vfntype);
5438 release_fn = identifier_global_value (release_fn);
5439 abort_fn = identifier_global_value (abort_fn);
5442 inner_if_stmt = begin_if_stmt ();
5443 finish_if_stmt_cond (build_call (acquire_fn, guard_addr_list),
5446 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
5447 begin = get_target_expr (boolean_false_node);
5448 flag = TARGET_EXPR_SLOT (begin);
5450 TARGET_EXPR_CLEANUP (begin)
5451 = build3 (COND_EXPR, void_type_node, flag,
5453 build_call (abort_fn, guard_addr_list));
5454 CLEANUP_EH_ONLY (begin) = 1;
5456 /* Do the initialization itself. */
5457 init = add_stmt_to_compound (begin, init);
5458 init = add_stmt_to_compound
5459 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
5460 init = add_stmt_to_compound
5461 (init, build_call (release_fn, guard_addr_list));
5464 init = add_stmt_to_compound (init, set_guard (guard));
5466 /* Use atexit to register a function for destroying this static
5468 init = add_stmt_to_compound (init, register_dtor_fn (decl));
5470 finish_expr_stmt (init);
5472 if (flag_threadsafe_statics)
5474 finish_compound_stmt (inner_then_clause);
5475 finish_then_clause (inner_if_stmt);
5476 finish_if_stmt (inner_if_stmt);
5479 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
5481 finish_compound_stmt (then_clause);
5482 finish_then_clause (if_stmt);
5483 finish_if_stmt (if_stmt);
5487 static_aggregates = tree_cons (init, decl, static_aggregates);
5491 /* Make TYPE a complete type based on INITIAL_VALUE.
5492 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
5493 2 if there was no information (in which case assume 0 if DO_DEFAULT),
5494 3 if the initializer list is empty (in pedantic mode). */
5497 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
5500 tree type, elt_type;
5504 /* An array of character type can be initialized from a
5505 brace-enclosed string constant.
5507 FIXME: this code is duplicated from reshape_init. Probably
5508 we should just call reshape_init here? */
5509 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
5510 && TREE_CODE (initial_value) == CONSTRUCTOR
5511 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
5513 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
5514 tree value = VEC_index (constructor_elt, v, 0)->value;
5516 if (TREE_CODE (value) == STRING_CST
5517 && VEC_length (constructor_elt, v) == 1)
5518 initial_value = value;
5522 failure = complete_array_type (ptype, initial_value, do_default);
5524 /* We can create the array before the element type is complete, which
5525 means that we didn't have these two bits set in the original type
5526 either. In completing the type, we are expected to propagate these
5527 bits. See also complete_type which does the same thing for arrays
5530 if (TYPE_DOMAIN (type))
5532 elt_type = TREE_TYPE (type);
5533 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
5534 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
5535 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
5541 /* Return zero if something is declared to be a member of type
5542 CTYPE when in the context of CUR_TYPE. STRING is the error
5543 message to print in that case. Otherwise, quietly return 1. */
5546 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
5548 if (ctype && ctype != cur_type)
5550 if (flags == DTOR_FLAG)
5551 error ("destructor for alien class %qT cannot be a member", ctype);
5553 error ("constructor for alien class %qT cannot be a member", ctype);
5559 /* Subroutine of `grokdeclarator'. */
5561 /* Generate errors possibly applicable for a given set of specifiers.
5562 This is for ARM $7.1.2. */
5565 bad_specifiers (tree object,
5574 error ("%qD declared as a %<virtual%> %s", object, type);
5576 error ("%qD declared as an %<inline%> %s", object, type);
5578 error ("%<const%> and %<volatile%> function specifiers on "
5579 "%qD invalid in %s declaration",
5582 error ("%q+D declared as a friend", object);
5584 && (TREE_CODE (object) == TYPE_DECL
5585 || (!TYPE_PTRFN_P (TREE_TYPE (object))
5586 && !TYPE_REFFN_P (TREE_TYPE (object))
5587 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
5588 error ("%q+D declared with an exception specification", object);
5591 /* DECL is a member function or static data member and is presently
5592 being defined. Check that the definition is taking place in a
5596 check_class_member_definition_namespace (tree decl)
5598 /* These checks only apply to member functions and static data
5600 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
5601 || TREE_CODE (decl) == VAR_DECL);
5602 /* We check for problems with specializations in pt.c in
5603 check_specialization_namespace, where we can issue better
5605 if (processing_specialization)
5607 /* There are no restrictions on the placement of
5608 explicit instantiations. */
5609 if (processing_explicit_instantiation)
5613 A member function definition that appears outside of the
5614 class definition shall appear in a namespace scope enclosing
5615 the class definition.
5619 The definition for a static data member shall appear in a
5620 namespace scope enclosing the member's class definition. */
5621 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
5622 pedwarn ("definition of %qD is not in namespace enclosing %qT",
5623 decl, DECL_CONTEXT (decl));
5626 /* CTYPE is class type, or null if non-class.
5627 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
5629 DECLARATOR is the function's name.
5630 PARMS is a chain of PARM_DECLs for the function.
5631 VIRTUALP is truthvalue of whether the function is virtual or not.
5632 FLAGS are to be passed through to `grokclassfn'.
5633 QUALS are qualifiers indicating whether the function is `const'
5635 RAISES is a list of exceptions that this function can raise.
5636 CHECK is 1 if we must find this method in CTYPE, 0 if we should
5637 not look, and -1 if we should not call `grokclassfn' at all.
5639 SFK is the kind of special function (if any) for the new function.
5641 Returns `NULL_TREE' if something goes wrong, after issuing
5642 applicable error messages. */
5645 grokfndecl (tree ctype,
5649 tree orig_declarator,
5651 enum overload_flags flags,
5658 special_function_kind sfk,
5665 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
5666 int has_default_arg = 0;
5670 type = build_exception_variant (type, raises);
5672 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
5673 DECL_ARGUMENTS (decl) = parms;
5674 /* Propagate volatile out from type to decl. */
5675 if (TYPE_VOLATILE (type))
5676 TREE_THIS_VOLATILE (decl) = 1;
5678 /* If this decl has namespace scope, set that up. */
5680 set_decl_namespace (decl, in_namespace, friendp);
5682 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
5684 /* `main' and builtins have implicit 'C' linkage. */
5685 if ((MAIN_NAME_P (declarator)
5686 || (IDENTIFIER_LENGTH (declarator) > 10
5687 && IDENTIFIER_POINTER (declarator)[0] == '_'
5688 && IDENTIFIER_POINTER (declarator)[1] == '_'
5689 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
5690 && current_lang_name == lang_name_cplusplus
5691 && ctype == NULL_TREE
5692 /* NULL_TREE means global namespace. */
5693 && DECL_CONTEXT (decl) == NULL_TREE)
5694 SET_DECL_LANGUAGE (decl, lang_c);
5696 /* Should probably propagate const out from type to decl I bet (mrs). */
5699 DECL_STATIC_FUNCTION_P (decl) = 1;
5700 DECL_CONTEXT (decl) = ctype;
5705 DECL_CONTEXT (decl) = ctype;
5707 check_class_member_definition_namespace (decl);
5710 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
5712 if (processing_template_decl)
5713 error ("cannot declare %<::main%> to be a template");
5715 error ("cannot declare %<::main%> to be inline");
5717 error ("cannot declare %<::main%> to be static");
5718 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
5721 error ("%<::main%> must return %<int%>");
5722 TREE_TYPE (TREE_TYPE (decl)) = integer_type_node;
5728 /* Members of anonymous types and local classes have no linkage; make
5729 them internal. If a typedef is made later, this will be changed. */
5730 if (ctype && (TYPE_ANONYMOUS_P (ctype)
5731 || decl_function_context (TYPE_MAIN_DECL (ctype))))
5736 /* [basic.link]: A name with no linkage (notably, the name of a class
5737 or enumeration declared in a local scope) shall not be used to
5738 declare an entity with linkage.
5740 Only check this for public decls for now. See core 319, 389. */
5741 t = no_linkage_check (TREE_TYPE (decl),
5742 /*relaxed_p=*/false);
5745 if (TYPE_ANONYMOUS_P (t))
5747 if (DECL_EXTERN_C_P (decl))
5748 /* Allow this; it's pretty common in C. */;
5751 pedwarn ("non-local function %q#D uses anonymous type",
5753 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
5754 pedwarn ("%q+#D does not refer to the unqualified "
5755 "type, so it is not used for linkage",
5760 pedwarn ("non-local function %q#D uses local type %qT", decl, t);
5764 TREE_PUBLIC (decl) = publicp;
5767 DECL_INTERFACE_KNOWN (decl) = 1;
5768 DECL_NOT_REALLY_EXTERN (decl) = 1;
5771 /* If the declaration was declared inline, mark it as such. */
5773 DECL_DECLARED_INLINE_P (decl) = 1;
5774 /* We inline functions that are explicitly declared inline, or, when
5775 the user explicitly asks us to, all functions. */
5776 if (DECL_DECLARED_INLINE_P (decl)
5777 || (flag_inline_trees == 2 && !DECL_INLINE (decl) && funcdef_flag))
5778 DECL_INLINE (decl) = 1;
5780 DECL_EXTERNAL (decl) = 1;
5781 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
5783 error ("%smember function %qD cannot have cv-qualifier",
5784 (ctype ? "static " : "non-"), decl);
5785 quals = TYPE_UNQUALIFIED;
5788 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl)))
5789 grok_op_properties (decl, /*complain=*/true);
5791 if (ctype && decl_function_context (decl))
5792 DECL_NO_STATIC_CHAIN (decl) = 1;
5794 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
5795 if (TREE_PURPOSE (t)
5796 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
5798 has_default_arg = 1;
5803 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
5807 ("defining explicit specialization %qD in friend declaration",
5811 tree fns = TREE_OPERAND (orig_declarator, 0);
5812 tree args = TREE_OPERAND (orig_declarator, 1);
5814 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
5816 /* Something like `template <class T> friend void f<T>()'. */
5817 error ("invalid use of template-id %qD in declaration "
5818 "of primary template",
5824 /* A friend declaration of the form friend void f<>(). Record
5825 the information in the TEMPLATE_ID_EXPR. */
5826 SET_DECL_IMPLICIT_INSTANTIATION (decl);
5828 if (TREE_CODE (fns) == COMPONENT_REF)
5830 /* Due to bison parser ickiness, we will have already looked
5831 up an operator_name or PFUNCNAME within the current class
5832 (see template_id in parse.y). If the current class contains
5833 such a name, we'll get a COMPONENT_REF here. Undo that. */
5835 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
5836 == current_class_type);
5837 fns = TREE_OPERAND (fns, 1);
5839 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
5840 || TREE_CODE (fns) == OVERLOAD);
5841 DECL_TEMPLATE_INFO (decl) = tree_cons (fns, args, NULL_TREE);
5843 if (has_default_arg)
5845 error ("default arguments are not allowed in declaration "
5846 "of friend template specialization %qD",
5853 error ("%<inline%> is not allowed in declaration of friend "
5854 "template specialization %qD",
5862 /* Make the init_value nonzero so pushdecl knows this is not
5863 tentative. error_mark_node is replaced later with the BLOCK. */
5864 DECL_INITIAL (decl) = error_mark_node;
5866 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
5867 TREE_NOTHROW (decl) = 1;
5869 /* Caller will do the rest of this. */
5873 if (ctype != NULL_TREE)
5875 if (sfk == sfk_constructor)
5876 DECL_CONSTRUCTOR_P (decl) = 1;
5878 grokclassfn (ctype, decl, flags, quals);
5881 decl = check_explicit_specialization (orig_declarator, decl,
5883 2 * (funcdef_flag != 0) +
5884 4 * (friendp != 0));
5885 if (decl == error_mark_node)
5890 cplus_decl_attributes (&decl, *attrlist, 0);
5891 *attrlist = NULL_TREE;
5894 if (ctype != NULL_TREE
5895 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
5900 old_decl = check_classfn (ctype, decl,
5901 (processing_template_decl
5902 > template_class_depth (ctype))
5903 ? current_template_parms
5906 if (old_decl && TREE_CODE (old_decl) == TEMPLATE_DECL)
5907 /* Because grokfndecl is always supposed to return a
5908 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
5909 here. We depend on our callers to figure out that its
5910 really a template that's being returned. */
5911 old_decl = DECL_TEMPLATE_RESULT (old_decl);
5913 if (old_decl && DECL_STATIC_FUNCTION_P (old_decl)
5914 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
5915 /* Remove the `this' parm added by grokclassfn.
5916 XXX Isn't this done in start_function, too? */
5917 revert_static_member_fn (decl);
5918 if (old_decl && DECL_ARTIFICIAL (old_decl))
5919 error ("definition of implicitly-declared %qD", old_decl);
5926 /* Since we've smashed OLD_DECL to its
5927 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
5928 if (TREE_CODE (decl) == TEMPLATE_DECL)
5929 decl = DECL_TEMPLATE_RESULT (decl);
5931 /* Attempt to merge the declarations. This can fail, in
5932 the case of some invalid specialization declarations. */
5933 pushed_scope = push_scope (ctype);
5934 ok = duplicate_decls (decl, old_decl, friendp);
5936 pop_scope (pushed_scope);
5939 error ("no %q#D member function declared in class %qT",
5947 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
5950 if (ctype == NULL_TREE || check)
5954 DECL_VIRTUAL_P (decl) = 1;
5959 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
5960 the linkage that DECL will receive in the object file. */
5963 set_linkage_for_static_data_member (tree decl)
5965 /* A static data member always has static storage duration and
5966 external linkage. Note that static data members are forbidden in
5967 local classes -- the only situation in which a class has
5968 non-external linkage. */
5969 TREE_PUBLIC (decl) = 1;
5970 TREE_STATIC (decl) = 1;
5971 /* For non-template classes, static data members are always put
5972 out in exactly those files where they are defined, just as
5973 with ordinary namespace-scope variables. */
5974 if (!processing_template_decl)
5975 DECL_INTERFACE_KNOWN (decl) = 1;
5978 /* Create a VAR_DECL named NAME with the indicated TYPE.
5980 If SCOPE is non-NULL, it is the class type or namespace containing
5981 the variable. If SCOPE is NULL, the variable should is created in
5982 the innermost enclosings scope. */
5985 grokvardecl (tree type,
5987 const cp_decl_specifier_seq *declspecs,
5993 tree explicit_scope;
5995 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
5997 /* Compute the scope in which to place the variable, but remember
5998 whether or not that scope was explicitly specified by the user. */
5999 explicit_scope = scope;
6002 /* An explicit "extern" specifier indicates a namespace-scope
6004 if (declspecs->storage_class == sc_extern)
6005 scope = current_namespace;
6006 else if (!at_function_scope_p ())
6007 scope = current_scope ();
6011 && (/* If the variable is a namespace-scope variable declared in a
6012 template, we need DECL_LANG_SPECIFIC. */
6013 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
6014 /* Similarly for namespace-scope variables with language linkage
6016 || (TREE_CODE (scope) == NAMESPACE_DECL
6017 && current_lang_name != lang_name_cplusplus)
6018 /* Similarly for static data members. */
6020 decl = build_lang_decl (VAR_DECL, name, type);
6022 decl = build_decl (VAR_DECL, name, type);
6024 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
6025 set_decl_namespace (decl, explicit_scope, 0);
6027 DECL_CONTEXT (decl) = scope;
6029 if (declspecs->storage_class == sc_extern)
6031 DECL_THIS_EXTERN (decl) = 1;
6032 DECL_EXTERNAL (decl) = !initialized;
6035 if (DECL_CLASS_SCOPE_P (decl))
6037 set_linkage_for_static_data_member (decl);
6038 /* This function is only called with out-of-class definitions. */
6039 DECL_EXTERNAL (decl) = 0;
6040 check_class_member_definition_namespace (decl);
6042 /* At top level, either `static' or no s.c. makes a definition
6043 (perhaps tentative), and absence of `static' makes it public. */
6044 else if (toplevel_bindings_p ())
6046 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
6047 && (DECL_THIS_EXTERN (decl) || ! constp));
6048 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
6050 /* Not at top level, only `static' makes a static definition. */
6053 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
6054 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
6057 if (declspecs->specs[(int)ds_thread])
6059 if (targetm.have_tls)
6060 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
6062 /* A mere warning is sure to result in improper semantics
6063 at runtime. Don't bother to allow this to compile. */
6064 error ("thread-local storage not supported for this target");
6067 if (TREE_PUBLIC (decl))
6069 /* [basic.link]: A name with no linkage (notably, the name of a class
6070 or enumeration declared in a local scope) shall not be used to
6071 declare an entity with linkage.
6073 Only check this for public decls for now. */
6074 tree t = no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false);
6077 if (TYPE_ANONYMOUS_P (t))
6079 if (DECL_EXTERN_C_P (decl))
6080 /* Allow this; it's pretty common in C. */
6084 /* DRs 132, 319 and 389 seem to indicate types with
6085 no linkage can only be used to declare extern "C"
6086 entities. Since it's not always an error in the
6087 ISO C++ 90 Standard, we only issue a warning. */
6088 warning (0, "non-local variable %q#D uses anonymous type",
6090 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
6091 warning (0, "%q+#D does not refer to the unqualified "
6092 "type, so it is not used for linkage",
6097 warning (0, "non-local variable %q#D uses local type %qT", decl, t);
6101 DECL_INTERFACE_KNOWN (decl) = 1;
6106 /* Create and return a canonical pointer to member function type, for
6107 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
6110 build_ptrmemfunc_type (tree type)
6114 tree unqualified_variant = NULL_TREE;
6116 if (type == error_mark_node)
6119 /* If a canonical type already exists for this type, use it. We use
6120 this method instead of type_hash_canon, because it only does a
6121 simple equality check on the list of field members. */
6123 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
6126 /* Make sure that we always have the unqualified pointer-to-member
6128 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
6130 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
6132 t = make_aggr_type (RECORD_TYPE);
6133 xref_basetypes (t, NULL_TREE);
6135 /* Let the front-end know this is a pointer to member function... */
6136 TYPE_PTRMEMFUNC_FLAG (t) = 1;
6137 /* ... and not really an aggregate. */
6138 SET_IS_AGGR_TYPE (t, 0);
6140 field = build_decl (FIELD_DECL, pfn_identifier, type);
6143 field = build_decl (FIELD_DECL, delta_identifier, delta_type_node);
6144 TREE_CHAIN (field) = fields;
6147 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
6149 /* Zap out the name so that the back-end will give us the debugging
6150 information for this anonymous RECORD_TYPE. */
6151 TYPE_NAME (t) = NULL_TREE;
6153 /* If this is not the unqualified form of this pointer-to-member
6154 type, set the TYPE_MAIN_VARIANT for this type to be the
6155 unqualified type. Since they are actually RECORD_TYPEs that are
6156 not variants of each other, we must do this manually. */
6157 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
6159 t = build_qualified_type (t, cp_type_quals (type));
6160 TYPE_MAIN_VARIANT (t) = unqualified_variant;
6161 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
6162 TYPE_NEXT_VARIANT (unqualified_variant) = t;
6165 /* Cache this pointer-to-member type so that we can find it again
6167 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
6172 /* Create and return a pointer to data member type. */
6175 build_ptrmem_type (tree class_type, tree member_type)
6177 if (TREE_CODE (member_type) == METHOD_TYPE)
6181 arg_types = TYPE_ARG_TYPES (member_type);
6182 class_type = (cp_build_qualified_type
6184 cp_type_quals (TREE_TYPE (TREE_VALUE (arg_types)))));
6186 = build_method_type_directly (class_type,
6187 TREE_TYPE (member_type),
6188 TREE_CHAIN (arg_types));
6189 return build_ptrmemfunc_type (build_pointer_type (member_type));
6193 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
6194 return build_offset_type (class_type, member_type);
6198 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
6199 Check to see that the definition is valid. Issue appropriate error
6200 messages. Return 1 if the definition is particularly bad, or 0
6204 check_static_variable_definition (tree decl, tree type)
6206 /* Motion 10 at San Diego: If a static const integral data member is
6207 initialized with an integral constant expression, the initializer
6208 may appear either in the declaration (within the class), or in
6209 the definition, but not both. If it appears in the class, the
6210 member is a member constant. The file-scope definition is always
6212 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
6214 error ("invalid in-class initialization of static data member "
6215 "of non-integral type %qT",
6217 /* If we just return the declaration, crashes will sometimes
6218 occur. We therefore return void_type_node, as if this were a
6219 friend declaration, to cause callers to completely ignore
6220 this declaration. */
6223 else if (!CP_TYPE_CONST_P (type))
6224 error ("ISO C++ forbids in-class initialization of non-const "
6225 "static member %qD",
6227 else if (pedantic && !INTEGRAL_TYPE_P (type))
6228 pedwarn ("ISO C++ forbids initialization of member constant "
6229 "%qD of non-integral type %qT", decl, type);
6234 /* Given the SIZE (i.e., number of elements) in an array, compute an
6235 appropriate index type for the array. If non-NULL, NAME is the
6236 name of the thing being declared. */
6239 compute_array_index_type (tree name, tree size)
6241 tree type = TREE_TYPE (size);
6244 /* The array bound must be an integer type. */
6245 if (!dependent_type_p (type) && !INTEGRAL_TYPE_P (type))
6248 error ("size of array %qD has non-integral type %qT", name, type);
6250 error ("size of array has non-integral type %qT", type);
6251 size = integer_one_node;
6252 type = TREE_TYPE (size);
6255 if (abi_version_at_least (2)
6256 /* We should only handle value dependent expressions specially. */
6257 ? value_dependent_expression_p (size)
6258 /* But for abi-1, we handled all instances in templates. This
6259 effects the manglings produced. */
6260 : processing_template_decl)
6261 return build_index_type (build_min (MINUS_EXPR, sizetype,
6262 size, integer_one_node));
6264 /* The size might be the result of a cast. */
6265 STRIP_TYPE_NOPS (size);
6267 /* It might be a const variable or enumeration constant. */
6268 size = integral_constant_value (size);
6270 /* Normally, the array-bound will be a constant. */
6271 if (TREE_CODE (size) == INTEGER_CST)
6273 /* Check to see if the array bound overflowed. Make that an
6274 error, no matter how generous we're being. */
6275 int old_flag_pedantic_errors = flag_pedantic_errors;
6276 int old_pedantic = pedantic;
6277 pedantic = flag_pedantic_errors = 1;
6278 constant_expression_warning (size);
6279 pedantic = old_pedantic;
6280 flag_pedantic_errors = old_flag_pedantic_errors;
6282 /* An array must have a positive number of elements. */
6283 if (INT_CST_LT (size, integer_zero_node))
6286 error ("size of array %qD is negative", name);
6288 error ("size of array is negative");
6289 size = integer_one_node;
6291 /* As an extension we allow zero-sized arrays. We always allow
6292 them in system headers because glibc uses them. */
6293 else if (integer_zerop (size) && pedantic && !in_system_header)
6296 pedwarn ("ISO C++ forbids zero-size array %qD", name);
6298 pedwarn ("ISO C++ forbids zero-size array");
6301 else if (TREE_CONSTANT (size))
6303 /* `(int) &fn' is not a valid array bound. */
6305 error ("size of array %qD is not an integral constant-expression",
6308 error ("size of array is not an integral constant-expression");
6313 pedwarn ("ISO C++ forbids variable-size array %qD", name);
6315 pedwarn ("ISO C++ forbids variable-size array");
6318 if (processing_template_decl && !TREE_CONSTANT (size))
6319 /* A variable sized array. */
6320 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
6323 HOST_WIDE_INT saved_processing_template_decl;
6325 /* Compute the index of the largest element in the array. It is
6326 one less than the number of elements in the array. We save
6327 and restore PROCESSING_TEMPLATE_DECL so that computations in
6328 cp_build_binary_op will be appropriately folded. */
6329 saved_processing_template_decl = processing_template_decl;
6330 processing_template_decl = 0;
6331 itype = cp_build_binary_op (MINUS_EXPR,
6332 cp_convert (ssizetype, size),
6333 cp_convert (ssizetype, integer_one_node));
6334 itype = fold (itype);
6335 processing_template_decl = saved_processing_template_decl;
6337 if (!TREE_CONSTANT (itype))
6338 /* A variable sized array. */
6339 itype = variable_size (itype);
6340 /* Make sure that there was no overflow when creating to a signed
6341 index type. (For example, on a 32-bit machine, an array with
6342 size 2^32 - 1 is too big.) */
6343 else if (TREE_OVERFLOW (itype))
6345 error ("overflow in array dimension");
6346 TREE_OVERFLOW (itype) = 0;
6350 /* Create and return the appropriate index type. */
6351 return build_index_type (itype);
6354 /* Returns the scope (if any) in which the entity declared by
6355 DECLARATOR will be located. If the entity was declared with an
6356 unqualified name, NULL_TREE is returned. */
6359 get_scope_of_declarator (const cp_declarator *declarator)
6361 while (declarator && declarator->kind != cdk_id)
6362 declarator = declarator->declarator;
6364 /* If the declarator-id is a SCOPE_REF, the scope in which the
6365 declaration occurs is the first operand. */
6367 && declarator->u.id.qualifying_scope)
6368 return declarator->u.id.qualifying_scope;
6370 /* Otherwise, the declarator is not a qualified name; the entity will
6371 be declared in the current scope. */
6375 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
6376 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
6380 create_array_type_for_decl (tree name, tree type, tree size)
6382 tree itype = NULL_TREE;
6383 const char* error_msg;
6385 /* If things have already gone awry, bail now. */
6386 if (type == error_mark_node || size == error_mark_node)
6387 return error_mark_node;
6389 /* Assume that everything will go OK. */
6392 /* There are some types which cannot be array elements. */
6393 switch (TREE_CODE (type))
6396 error_msg = "array of void";
6400 error_msg = "array of functions";
6403 case REFERENCE_TYPE:
6404 error_msg = "array of references";
6408 error_msg = "array of function members";
6415 /* If something went wrong, issue an error-message and return. */
6419 error ("declaration of %qD as %s", name, error_msg);
6421 error ("creating %s", error_msg);
6423 return error_mark_node;
6428 The constant expressions that specify the bounds of the arrays
6429 can be omitted only for the first member of the sequence. */
6430 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
6433 error ("declaration of %qD as multidimensional array must "
6434 "have bounds for all dimensions except the first",
6437 error ("multidimensional array must have bounds for all "
6438 "dimensions except the first");
6440 return error_mark_node;
6443 /* Figure out the index type for the array. */
6445 itype = compute_array_index_type (name, size);
6448 T is called the array element type; this type shall not be [...] an
6449 abstract class type. */
6450 abstract_virtuals_error (name, type);
6452 return build_cplus_array_type (type, itype);
6455 /* Check that it's OK to declare a function with the indicated TYPE.
6456 SFK indicates the kind of special function (if any) that this
6457 function is. OPTYPE is the type given in a conversion operator
6458 declaration, or the class type for a constructor/destructor.
6459 Returns the actual return type of the function; that
6460 may be different than TYPE if an error occurs, or for certain
6461 special functions. */
6464 check_special_function_return_type (special_function_kind sfk,
6470 case sfk_constructor:
6472 error ("return type specification for constructor invalid");
6474 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
6475 type = build_pointer_type (optype);
6477 type = void_type_node;
6480 case sfk_destructor:
6482 error ("return type specification for destructor invalid");
6483 /* We can't use the proper return type here because we run into
6484 problems with ambiguous bases and covariant returns.
6485 Java classes are left unchanged because (void *) isn't a valid
6486 Java type, and we don't want to change the Java ABI. */
6487 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
6488 type = build_pointer_type (void_type_node);
6490 type = void_type_node;
6493 case sfk_conversion:
6494 if (type && !same_type_p (type, optype))
6495 error ("operator %qT declared to return %qT", optype, type);
6497 pedwarn ("return type specified for %<operator %T%>", optype);
6508 /* A variable or data member (whose unqualified name is IDENTIFIER)
6509 has been declared with the indicated TYPE. If the TYPE is not
6510 acceptable, issue an error message and return a type to use for
6511 error-recovery purposes. */
6514 check_var_type (tree identifier, tree type)
6516 if (VOID_TYPE_P (type))
6519 error ("unnamed variable or field declared void");
6520 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
6522 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
6523 error ("variable or field %qE declared void", identifier);
6526 error ("variable or field declared void");
6527 type = integer_type_node;
6533 /* Given declspecs and a declarator (abstract or otherwise), determine
6534 the name and type of the object declared and construct a DECL node
6537 DECLSPECS is a chain of tree_list nodes whose value fields
6538 are the storage classes and type specifiers.
6540 DECL_CONTEXT says which syntactic context this declaration is in:
6541 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
6542 FUNCDEF for a function definition. Like NORMAL but a few different
6543 error messages in each case. Return value may be zero meaning
6544 this definition is too screwy to try to parse.
6545 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
6546 handle member functions (which have FIELD context).
6547 Return value may be zero meaning this definition is too screwy to
6549 PARM for a parameter declaration (either within a function prototype
6550 or before a function body). Make a PARM_DECL, or return void_type_node.
6551 CATCHPARM for a parameter declaration before a catch clause.
6552 TYPENAME if for a typename (in a cast or sizeof).
6553 Don't make a DECL node; just return the ..._TYPE node.
6554 FIELD for a struct or union field; make a FIELD_DECL.
6555 BITFIELD for a field with specified width.
6556 INITIALIZED is 1 if the decl has an initializer.
6558 ATTRLIST is a pointer to the list of attributes, which may be NULL
6559 if there are none; *ATTRLIST may be modified if attributes from inside
6560 the declarator should be applied to the declaration.
6562 When this function is called, scoping variables (such as
6563 CURRENT_CLASS_TYPE) should reflect the scope in which the
6564 declaration occurs, not the scope in which the new declaration will
6565 be placed. For example, on:
6569 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
6570 should not be `S'. */
6573 grokdeclarator (const cp_declarator *declarator,
6574 const cp_decl_specifier_seq *declspecs,
6575 enum decl_context decl_context,
6579 tree type = NULL_TREE;
6582 int virtualp, explicitp, friendp, inlinep, staticp;
6583 int explicit_int = 0;
6584 int explicit_char = 0;
6585 int defaulted_int = 0;
6586 tree dependant_name = NULL_TREE;
6588 tree typedef_decl = NULL_TREE;
6589 const char *name = NULL;
6590 tree typedef_type = NULL_TREE;
6591 int funcdef_flag = 0;
6592 cp_declarator_kind innermost_code = cdk_error;
6595 /* See the code below that used this. */
6596 tree decl_attr = NULL_TREE;
6599 /* Keep track of what sort of function is being processed
6600 so that we can warn about default return values, or explicit
6601 return values which do not match prescribed defaults. */
6602 special_function_kind sfk = sfk_none;
6604 tree dname = NULL_TREE;
6605 tree ctor_return_type = NULL_TREE;
6606 enum overload_flags flags = NO_SPECIAL;
6607 cp_cv_quals quals = TYPE_UNQUALIFIED;
6608 tree raises = NULL_TREE;
6609 int template_count = 0;
6610 tree returned_attrs = NULL_TREE;
6611 tree parms = NULL_TREE;
6612 const cp_declarator *id_declarator;
6613 /* The unqualified name of the declarator; either an
6614 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
6615 tree unqualified_id;
6616 /* The class type, if any, in which this entity is located,
6617 or NULL_TREE if none. Note that this value may be different from
6618 the current class type; for example if an attempt is made to declare
6619 "A::f" inside "B", this value will be "A". */
6620 tree ctype = current_class_type;
6621 /* The NAMESPACE_DECL for the namespace in which this entity is
6622 located. If an unqualified name is used to declare the entity,
6623 this value will be NULL_TREE, even if the entity is located at
6625 tree in_namespace = NULL_TREE;
6627 cp_storage_class storage_class;
6628 bool unsigned_p, signed_p, short_p, long_p, thread_p;
6629 bool type_was_error_mark_node = false;
6631 signed_p = declspecs->specs[(int)ds_signed];
6632 unsigned_p = declspecs->specs[(int)ds_unsigned];
6633 short_p = declspecs->specs[(int)ds_short];
6634 long_p = declspecs->specs[(int)ds_long];
6635 thread_p = declspecs->specs[(int)ds_thread];
6637 if (decl_context == FUNCDEF)
6638 funcdef_flag = 1, decl_context = NORMAL;
6639 else if (decl_context == MEMFUNCDEF)
6640 funcdef_flag = -1, decl_context = FIELD;
6641 else if (decl_context == BITFIELD)
6642 bitfield = 1, decl_context = FIELD;
6644 /* Look inside a declarator for the name being declared
6645 and get it as a string, for an error message. */
6646 for (id_declarator = declarator;
6648 id_declarator = id_declarator->declarator)
6650 if (id_declarator->kind != cdk_id)
6651 innermost_code = id_declarator->kind;
6653 switch (id_declarator->kind)
6656 if (id_declarator->declarator
6657 && id_declarator->declarator->kind == cdk_id)
6659 sfk = id_declarator->declarator->u.id.sfk;
6660 if (sfk == sfk_destructor)
6667 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
6668 tree decl = id_declarator->u.id.unqualified_name;
6671 if (qualifying_scope)
6673 if (TYPE_P (qualifying_scope))
6675 ctype = qualifying_scope;
6676 if (innermost_code != cdk_function
6677 && current_class_type
6678 && !UNIQUELY_DERIVED_FROM_P (ctype,
6679 current_class_type))
6681 error ("type %qT is not derived from type %qT",
6682 ctype, current_class_type);
6683 return error_mark_node;
6686 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
6687 in_namespace = qualifying_scope;
6689 if (TREE_CODE (decl) == BASELINK)
6690 decl = BASELINK_FUNCTIONS (decl);
6691 if (decl == error_mark_node)
6692 return error_mark_node;
6693 switch (TREE_CODE (decl))
6699 if (innermost_code != cdk_function)
6701 error ("declaration of %qD as non-function", decl);
6702 return error_mark_node;
6704 else if (!qualifying_scope
6705 && !(current_class_type && at_class_scope_p ()))
6707 error ("declaration of %qD as non-member", decl);
6708 return error_mark_node;
6711 type = TREE_OPERAND (decl, 0);
6712 name = IDENTIFIER_POINTER (constructor_name (type));
6716 case TEMPLATE_ID_EXPR:
6718 tree fns = TREE_OPERAND (decl, 0);
6721 if (TREE_CODE (dname) == COMPONENT_REF)
6722 dname = TREE_OPERAND (dname, 1);
6723 if (TREE_CODE (dname) != IDENTIFIER_NODE)
6725 gcc_assert (is_overloaded_fn (dname));
6726 dname = DECL_NAME (get_first_fn (dname));
6731 case IDENTIFIER_NODE:
6732 if (TREE_CODE (decl) == IDENTIFIER_NODE)
6735 if (C_IS_RESERVED_WORD (dname))
6737 error ("declarator-id missing; using reserved word %qD",
6739 name = IDENTIFIER_POINTER (dname);
6741 else if (!IDENTIFIER_TYPENAME_P (dname))
6742 name = IDENTIFIER_POINTER (dname);
6745 gcc_assert (flags == NO_SPECIAL);
6746 flags = TYPENAME_FLAG;
6747 ctor_return_type = TREE_TYPE (dname);
6748 sfk = sfk_conversion;
6749 if (is_typename_at_global_scope (dname))
6750 name = IDENTIFIER_POINTER (dname);
6752 name = "<invalid operator>";
6757 dname = constructor_name (TREE_TYPE (decl));
6758 name = IDENTIFIER_POINTER (dname);
6779 if (id_declarator->kind == cdk_id)
6783 /* A function definition's declarator must have the form of
6784 a function declarator. */
6786 if (funcdef_flag && innermost_code != cdk_function)
6789 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
6790 && innermost_code != cdk_function
6791 && ! (ctype && !declspecs->any_specifiers_p))
6793 error ("declaration of %qD as non-function", dname);
6794 return error_mark_node;
6797 /* Anything declared one level down from the top level
6798 must be one of the parameters of a function
6799 (because the body is at least two levels down). */
6801 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
6802 by not allowing C++ class definitions to specify their parameters
6803 with xdecls (must be spec.d in the parmlist).
6805 Since we now wait to push a class scope until we are sure that
6806 we are in a legitimate method context, we must set oldcname
6807 explicitly (since current_class_name is not yet alive).
6809 We also want to avoid calling this a PARM if it is in a namespace. */
6811 if (decl_context == NORMAL && !toplevel_bindings_p ())
6813 struct cp_binding_level *b = current_binding_level;
6814 current_binding_level = b->level_chain;
6815 if (current_binding_level != 0 && toplevel_bindings_p ())
6816 decl_context = PARM;
6817 current_binding_level = b;
6821 name = decl_context == PARM ? "parameter" : "type name";
6823 /* If there were multiple types specified in the decl-specifier-seq,
6824 issue an error message. */
6825 if (declspecs->multiple_types_p)
6826 error ("two or more data types in declaration of %qs", name);
6827 /* Extract the basic type from the decl-specifier-seq. */
6828 type = declspecs->type;
6829 if (type == error_mark_node)
6832 type_was_error_mark_node = true;
6834 /* If the entire declaration is itself tagged as deprecated then
6835 suppress reports of deprecated items. */
6836 if (type && TREE_DEPRECATED (type)
6837 && deprecated_state != DEPRECATED_SUPPRESS)
6838 warn_deprecated_use (type);
6839 if (type && TREE_CODE (type) == TYPE_DECL)
6841 typedef_decl = type;
6842 type = TREE_TYPE (typedef_decl);
6844 /* No type at all: default to `int', and set DEFAULTED_INT
6845 because it was not a user-defined typedef. */
6846 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
6848 /* These imply 'int'. */
6849 type = integer_type_node;
6853 explicit_int = declspecs->explicit_int_p;
6854 explicit_char = declspecs->explicit_char_p;
6856 /* Check for repeated decl-specifiers. */
6857 for (ds = ds_first; ds != ds_last; ++ds)
6859 unsigned count = declspecs->specs[(int)ds];
6862 /* The "long" specifier is a special case because of
6867 error ("%<long long long%> is too long for GCC");
6868 else if (pedantic && !in_system_header && warn_long_long)
6869 pedwarn ("ISO C++ does not support %<long long%>");
6873 else if (declspecs->specs[(int)ds] > 1)
6875 static const char *const decl_spec_names[] = {
6891 error ("duplicate %qs", decl_spec_names[(int)ds]);
6896 /* See the code below that used this. */
6898 decl_attr = DECL_ATTRIBUTES (typedef_decl);
6900 typedef_type = type;
6903 if (sfk != sfk_conversion)
6904 ctor_return_type = ctype;
6906 if (sfk != sfk_none)
6907 type = check_special_function_return_type (sfk, type,
6909 else if (type == NULL_TREE)
6915 /* We handle `main' specially here, because 'main () { }' is so
6916 common. With no options, it is allowed. With -Wreturn-type,
6917 it is a warning. It is only an error with -pedantic-errors. */
6918 is_main = (funcdef_flag
6919 && dname && MAIN_NAME_P (dname)
6920 && ctype == NULL_TREE
6921 && in_namespace == NULL_TREE
6922 && current_namespace == global_namespace);
6924 if (type_was_error_mark_node)
6925 /* We've already issued an error, don't complain more. */;
6926 else if (in_system_header || flag_ms_extensions)
6927 /* Allow it, sigh. */;
6928 else if (pedantic || ! is_main)
6929 pedwarn ("ISO C++ forbids declaration of %qs with no type", name);
6930 else if (warn_return_type)
6931 warning (0, "ISO C++ forbids declaration of %qs with no type", name);
6933 type = integer_type_node;
6938 /* Now process the modifiers that were specified
6939 and check for invalid combinations. */
6941 /* Long double is a special combination. */
6942 if (long_p && TYPE_MAIN_VARIANT (type) == double_type_node)
6945 type = build_qualified_type (long_double_type_node,
6946 cp_type_quals (type));
6949 /* Check all other uses of type modifiers. */
6951 if (unsigned_p || signed_p || long_p || short_p)
6955 if (TREE_CODE (type) == REAL_TYPE)
6956 error ("short, signed or unsigned invalid for %qs", name);
6957 else if (TREE_CODE (type) != INTEGER_TYPE)
6958 error ("long, short, signed or unsigned invalid for %qs", name);
6959 else if (long_p && short_p)
6960 error ("long and short specified together for %qs", name);
6961 else if ((long_p || short_p) && explicit_char)
6962 error ("long or short specified with char for %qs", name);
6963 else if ((long_p|| short_p) && TREE_CODE (type) == REAL_TYPE)
6964 error ("long or short specified with floating type for %qs", name);
6965 else if (signed_p && unsigned_p)
6966 error ("signed and unsigned given together for %qs", name);
6970 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
6972 pedwarn ("long, short, signed or unsigned used invalidly for %qs",
6974 if (flag_pedantic_errors)
6979 /* Discard the type modifiers if they are invalid. */
6990 /* Decide whether an integer type is signed or not.
6991 Optionally treat bitfields as signed by default. */
6995 It is implementation-defined whether a plain (neither
6996 explicitly signed or unsigned) char, short, int, or long
6997 bit-field is signed or unsigned.
6999 Naturally, we extend this to long long as well. Note that
7000 this does not include wchar_t. */
7001 || (bitfield && !flag_signed_bitfields
7003 /* A typedef for plain `int' without `signed' can be
7004 controlled just like plain `int', but a typedef for
7005 `signed int' cannot be so controlled. */
7007 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
7008 && (TREE_CODE (type) == INTEGER_TYPE
7009 || TREE_CODE (type) == CHAR_TYPE)
7010 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
7013 type = long_long_unsigned_type_node;
7015 type = long_unsigned_type_node;
7017 type = short_unsigned_type_node;
7018 else if (type == char_type_node)
7019 type = unsigned_char_type_node;
7020 else if (typedef_decl)
7021 type = c_common_unsigned_type (type);
7023 type = unsigned_type_node;
7025 else if (signed_p && type == char_type_node)
7026 type = signed_char_type_node;
7028 type = long_long_integer_type_node;
7030 type = long_integer_type_node;
7032 type = short_integer_type_node;
7034 if (declspecs->specs[(int)ds_complex])
7036 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
7037 error ("complex invalid for %qs", name);
7038 /* If we just have "complex", it is equivalent to
7039 "complex double", but if any modifiers at all are specified it is
7040 the complex form of TYPE. E.g, "complex short" is
7041 "complex short int". */
7043 else if (defaulted_int && ! longlong
7044 && ! (long_p || short_p || signed_p || unsigned_p))
7045 type = complex_double_type_node;
7046 else if (type == integer_type_node)
7047 type = complex_integer_type_node;
7048 else if (type == float_type_node)
7049 type = complex_float_type_node;
7050 else if (type == double_type_node)
7051 type = complex_double_type_node;
7052 else if (type == long_double_type_node)
7053 type = complex_long_double_type_node;
7055 type = build_complex_type (type);
7058 type_quals = TYPE_UNQUALIFIED;
7059 if (declspecs->specs[(int)ds_const])
7060 type_quals |= TYPE_QUAL_CONST;
7061 if (declspecs->specs[(int)ds_volatile])
7062 type_quals |= TYPE_QUAL_VOLATILE;
7063 if (declspecs->specs[(int)ds_restrict])
7064 type_quals |= TYPE_QUAL_RESTRICT;
7065 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
7066 error ("qualifiers are not allowed on declaration of %<operator %T%>",
7069 if (TREE_CODE (type) == FUNCTION_TYPE
7070 && type_quals != TYPE_UNQUALIFIED)
7072 /* This was an error in C++98 (cv-qualifiers cannot be added to
7073 a function type), but DR 295 makes the code well-formed by
7074 dropping the extra qualifiers. */
7077 tree bad_type = build_qualified_type (type, type_quals);
7078 pedwarn ("ignoring %qV qualifiers added to function type %qT",
7081 type_quals = TYPE_UNQUALIFIED;
7083 type_quals |= cp_type_quals (type);
7084 type = cp_build_qualified_type_real
7085 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
7086 ? tf_ignore_bad_quals : 0) | tf_error | tf_warning));
7087 /* We might have ignored or rejected some of the qualifiers. */
7088 type_quals = cp_type_quals (type);
7091 inlinep = !! declspecs->specs[(int)ds_inline];
7092 virtualp = !! declspecs->specs[(int)ds_virtual];
7093 explicitp = !! declspecs->specs[(int)ds_explicit];
7095 storage_class = declspecs->storage_class;
7096 if (storage_class == sc_static)
7097 staticp = 1 + (decl_context == FIELD);
7099 if (virtualp && staticp == 2)
7101 error ("member %qD cannot be declared both virtual and static", dname);
7104 friendp = !! declspecs->specs[(int)ds_friend];
7106 if (dependant_name && !friendp)
7108 error ("%<%T::%D%> is not a valid declarator", ctype, dependant_name);
7109 return void_type_node;
7112 /* Issue errors about use of storage classes for parameters. */
7113 if (decl_context == PARM)
7115 if (declspecs->specs[(int)ds_typedef])
7116 error ("typedef declaration invalid in parameter declaration");
7117 else if (storage_class == sc_static
7118 || storage_class == sc_extern
7120 error ("storage class specifiers invalid in parameter declarations");
7123 /* Give error if `virtual' is used outside of class declaration. */
7125 && (current_class_name == NULL_TREE || decl_context != FIELD))
7127 error ("virtual outside class declaration");
7131 /* Static anonymous unions are dealt with here. */
7132 if (staticp && decl_context == TYPENAME
7134 && ANON_AGGR_TYPE_P (declspecs->type))
7135 decl_context = FIELD;
7137 /* Warn about storage classes that are invalid for certain
7138 kinds of declarations (parameters, typenames, etc.). */
7139 if (declspecs->multiple_storage_classes_p)
7141 error ("multiple storage classes in declaration of %qs", name);
7142 storage_class = sc_none;
7146 && storage_class != sc_extern
7147 && storage_class != sc_static)
7148 || declspecs->specs[(int)ds_typedef]))
7150 error ("multiple storage classes in declaration of %qs", name);
7153 else if (decl_context != NORMAL
7154 && ((storage_class != sc_none
7155 && storage_class != sc_mutable)
7158 if ((decl_context == PARM || decl_context == CATCHPARM)
7159 && (storage_class == sc_register
7160 || storage_class == sc_auto))
7162 else if (declspecs->specs[(int)ds_typedef])
7164 else if (decl_context == FIELD
7165 /* C++ allows static class elements. */
7166 && storage_class == sc_static)
7167 /* C++ also allows inlines and signed and unsigned elements,
7168 but in those cases we don't come in here. */
7172 if (decl_context == FIELD)
7173 error ("storage class specified for %qs", name);
7176 if (decl_context == PARM || decl_context == CATCHPARM)
7177 error ("storage class specified for parameter %qs", name);
7179 error ("storage class specified for typename");
7181 if (storage_class == sc_register
7182 || storage_class == sc_auto
7183 || storage_class == sc_extern
7185 storage_class = sc_none;
7188 else if (storage_class == sc_extern && initialized
7191 if (toplevel_bindings_p ())
7193 /* It's common practice (and completely valid) to have a const
7194 be initialized and declared extern. */
7195 if (!(type_quals & TYPE_QUAL_CONST))
7196 warning (0, "%qs initialized and declared %<extern%>", name);
7199 error ("%qs has both %<extern%> and initializer", name);
7201 else if (storage_class == sc_extern && funcdef_flag
7202 && ! toplevel_bindings_p ())
7203 error ("nested function %qs declared %<extern%>", name);
7204 else if (toplevel_bindings_p ())
7206 if (storage_class == sc_auto)
7207 error ("top-level declaration of %qs specifies %<auto%>", name);
7210 && storage_class != sc_extern
7211 && storage_class != sc_static)
7213 error ("function-scope %qs implicitly auto and declared %<__thread%>",
7218 if (storage_class && friendp)
7219 error ("storage class specifiers invalid in friend function declarations");
7222 unqualified_id = NULL_TREE;
7225 unqualified_id = id_declarator->u.id.unqualified_name;
7226 if (TREE_CODE (unqualified_id) == BASELINK)
7227 unqualified_id = BASELINK_FUNCTIONS (unqualified_id);
7228 switch (TREE_CODE (unqualified_id))
7232 = constructor_name (TREE_OPERAND (unqualified_id, 0));
7237 = constructor_name (TREE_TYPE (unqualified_id));
7240 case IDENTIFIER_NODE:
7241 case TEMPLATE_ID_EXPR:
7249 /* Determine the type of the entity declared by recurring on the
7251 for (; declarator; declarator = declarator->declarator)
7253 const cp_declarator *inner_declarator;
7256 if (type == error_mark_node)
7257 return error_mark_node;
7259 attrs = declarator->attributes;
7265 if (declarator == NULL || declarator->kind == cdk_id)
7266 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
7267 if (declarator->kind == cdk_function)
7268 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
7269 if (declarator->kind == cdk_array)
7270 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
7271 returned_attrs = decl_attributes (&type,
7272 chainon (returned_attrs, attrs),
7276 if (declarator->kind == cdk_id)
7279 inner_declarator = declarator->declarator;
7281 switch (declarator->kind)
7284 type = create_array_type_for_decl (dname, type,
7285 declarator->u.array.bounds);
7293 /* Declaring a function type.
7294 Make sure we have a valid type for the function to return. */
7296 /* We now know that the TYPE_QUALS don't apply to the
7297 decl, but to its return type. */
7298 type_quals = TYPE_UNQUALIFIED;
7300 /* Warn about some types functions can't return. */
7302 if (TREE_CODE (type) == FUNCTION_TYPE)
7304 error ("%qs declared as function returning a function", name);
7305 type = integer_type_node;
7307 if (TREE_CODE (type) == ARRAY_TYPE)
7309 error ("%qs declared as function returning an array", name);
7310 type = integer_type_node;
7313 /* Pick up type qualifiers which should be applied to `this'. */
7314 quals = declarator->u.function.qualifiers;
7316 /* Pick up the exception specifications. */
7317 raises = declarator->u.function.exception_specification;
7319 /* Say it's a definition only for the CALL_EXPR
7320 closest to the identifier. */
7321 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
7323 if (ctype == NULL_TREE
7324 && decl_context == FIELD
7326 && (friendp == 0 || dname == current_class_name))
7327 ctype = current_class_type;
7329 if (ctype && sfk == sfk_conversion)
7330 TYPE_HAS_CONVERSION (ctype) = 1;
7331 if (ctype && (sfk == sfk_constructor
7332 || sfk == sfk_destructor))
7334 /* We are within a class's scope. If our declarator name
7335 is the same as the class name, and we are defining
7336 a function, then it is a constructor/destructor, and
7337 therefore returns a void type. */
7339 if (flags == DTOR_FLAG)
7341 /* ISO C++ 12.4/2. A destructor may not be
7342 declared const or volatile. A destructor may
7345 error ("destructor cannot be static member function");
7348 error ("destructors may not be cv-qualified");
7349 quals = TYPE_UNQUALIFIED;
7351 if (decl_context == FIELD)
7353 if (! member_function_or_else (ctype,
7356 return void_type_node;
7359 else /* It's a constructor. */
7363 /* ISO C++ 12.1. A constructor may not be
7364 declared const or volatile. A constructor may
7365 not be virtual. A constructor may not be
7368 error ("constructor cannot be static member function");
7371 pedwarn ("constructors cannot be declared virtual");
7376 error ("constructors may not be cv-qualified");
7377 quals = TYPE_UNQUALIFIED;
7379 if (decl_context == FIELD)
7381 if (! member_function_or_else (ctype,
7384 return void_type_node;
7385 TYPE_HAS_CONSTRUCTOR (ctype) = 1;
7386 if (sfk != sfk_constructor)
7390 if (decl_context == FIELD)
7396 error ("can't initialize friend function %qs", name);
7399 /* Cannot be both friend and virtual. */
7400 error ("virtual functions cannot be friends");
7403 if (decl_context == NORMAL)
7404 error ("friend declaration not in class definition");
7405 if (current_function_decl && funcdef_flag)
7406 error ("can't define friend function %qs in a local "
7411 arg_types = grokparms (declarator->u.function.parameters,
7414 if (inner_declarator
7415 && inner_declarator->kind == cdk_id
7416 && inner_declarator->u.id.sfk == sfk_destructor
7417 && arg_types != void_list_node)
7419 error ("destructors may not have parameters");
7420 arg_types = void_list_node;
7424 type = build_function_type (type, arg_types);
7425 type = cp_build_qualified_type (type, quals);
7432 /* Filter out pointers-to-references and references-to-references.
7433 We can get these if a TYPE_DECL is used. */
7435 if (TREE_CODE (type) == REFERENCE_TYPE)
7437 error (declarator->kind == cdk_reference
7438 ? "cannot declare reference to %q#T"
7439 : "cannot declare pointer to %q#T", type);
7440 type = TREE_TYPE (type);
7442 else if (VOID_TYPE_P (type))
7444 if (declarator->kind == cdk_reference)
7445 error ("cannot declare reference to %q#T", type);
7446 else if (declarator->kind == cdk_ptrmem)
7447 error ("cannot declare pointer to %q#T member", type);
7450 /* We now know that the TYPE_QUALS don't apply to the decl,
7451 but to the target of the pointer. */
7452 type_quals = TYPE_UNQUALIFIED;
7454 if (declarator->kind == cdk_ptrmem
7455 && (TREE_CODE (type) == FUNCTION_TYPE
7456 || (quals && TREE_CODE (type) == METHOD_TYPE)))
7460 /* If the type is a FUNCTION_TYPE, pick up the
7461 qualifiers from that function type. No other
7462 qualifiers may be supplied. */
7463 if (TREE_CODE (type) == FUNCTION_TYPE)
7464 quals = cp_type_quals (type);
7466 dummy = build_decl (TYPE_DECL, NULL_TREE, type);
7467 grok_method_quals (declarator->u.pointer.class_type,
7469 type = TREE_TYPE (dummy);
7470 quals = TYPE_UNQUALIFIED;
7473 if (declarator->kind == cdk_reference)
7475 if (!VOID_TYPE_P (type))
7476 type = build_reference_type (type);
7478 else if (TREE_CODE (type) == METHOD_TYPE)
7479 type = build_ptrmemfunc_type (build_pointer_type (type));
7480 else if (declarator->kind == cdk_ptrmem)
7482 /* We might have parsed a namespace as the class type. */
7483 if (TREE_CODE (declarator->u.pointer.class_type)
7486 error ("%qD is a namespace",
7487 declarator->u.pointer.class_type);
7488 type = build_pointer_type (type);
7490 else if (declarator->u.pointer.class_type == error_mark_node)
7491 /* We will already have complained. */
7492 type = error_mark_node;
7494 type = build_ptrmem_type (declarator->u.pointer.class_type,
7498 type = build_pointer_type (type);
7500 /* Process a list of type modifier keywords (such as
7501 const or volatile) that were given inside the `*' or `&'. */
7503 if (declarator->u.pointer.qualifiers)
7506 = cp_build_qualified_type (type,
7507 declarator->u.pointer.qualifiers);
7508 type_quals = cp_type_quals (type);
7521 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
7522 && TREE_CODE (type) != FUNCTION_TYPE
7523 && TREE_CODE (type) != METHOD_TYPE)
7525 error ("template-id %qD used as a declarator",
7527 unqualified_id = dname;
7530 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
7531 qualified with a class-name, turn it into a METHOD_TYPE, unless
7532 we know that the function is static. We take advantage of this
7533 opportunity to do other processing that pertains to entities
7534 explicitly declared to be class members. Note that if DECLARATOR
7535 is non-NULL, we know it is a cdk_id declarator; otherwise, we
7536 would not have exited the loop above. */
7538 && declarator->u.id.qualifying_scope
7539 && TYPE_P (declarator->u.id.qualifying_scope))
7543 ctype = declarator->u.id.qualifying_scope;
7544 ctype = TYPE_MAIN_VARIANT (ctype);
7546 while (t != NULL_TREE && CLASS_TYPE_P (t))
7548 /* You're supposed to have one `template <...>' for every
7549 template class, but you don't need one for a full
7550 specialization. For example:
7552 template <class T> struct S{};
7553 template <> struct S<int> { void f(); };
7554 void S<int>::f () {}
7556 is correct; there shouldn't be a `template <>' for the
7557 definition of `S<int>::f'. */
7558 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
7559 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
7560 /* T is an explicit (not partial) specialization. All
7561 containing classes must therefore also be explicitly
7564 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
7565 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
7566 template_count += 1;
7568 t = TYPE_MAIN_DECL (t);
7569 t = DECL_CONTEXT (t);
7572 if (ctype == current_class_type)
7573 pedwarn ("extra qualification %<%T::%> on member %qs ignored",
7575 else if (TREE_CODE (type) == FUNCTION_TYPE)
7577 tree sname = declarator->u.id.unqualified_name;
7579 if (TREE_CODE (sname) == IDENTIFIER_NODE
7580 && NEW_DELETE_OPNAME_P (sname))
7581 /* Overloaded operator new and operator delete
7582 are always static functions. */
7584 else if (current_class_type == NULL_TREE || friendp)
7586 = build_method_type_directly (ctype,
7588 TYPE_ARG_TYPES (type));
7591 error ("cannot declare member function %<%T::%s%> within %<%T%>",
7592 ctype, name, current_class_type);
7593 return error_mark_node;
7596 else if (declspecs->specs[(int)ds_typedef]
7597 || COMPLETE_TYPE_P (complete_type (ctype)))
7599 /* Have to move this code elsewhere in this function.
7600 this code is used for i.e., typedef int A::M; M *pm;
7602 It is? How? jason 10/2/94 */
7604 if (current_class_type)
7606 error ("cannot declare member %<%T::%s%> within %qT",
7607 ctype, name, current_class_type);
7608 return void_type_node;
7613 cxx_incomplete_type_error (NULL_TREE, ctype);
7614 return error_mark_node;
7618 /* Now TYPE has the actual type. */
7623 *attrlist = chainon (returned_attrs, *attrlist);
7625 attrlist = &returned_attrs;
7628 /* Did array size calculations overflow? */
7630 if (TREE_CODE (type) == ARRAY_TYPE
7631 && COMPLETE_TYPE_P (type)
7632 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
7633 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
7635 error ("size of array %qs is too large", name);
7636 /* If we proceed with the array type as it is, we'll eventually
7637 crash in tree_low_cst(). */
7638 type = error_mark_node;
7641 if ((decl_context == FIELD || decl_context == PARM)
7642 && !processing_template_decl
7643 && variably_modified_type_p (type, NULL_TREE))
7645 if (decl_context == FIELD)
7646 error ("data member may not have variably modified type %qT", type);
7648 error ("parameter may not have variably modified type %qT", type);
7649 type = error_mark_node;
7652 if (explicitp == 1 || (explicitp && friendp))
7654 /* [dcl.fct.spec] The explicit specifier shall only be used in
7655 declarations of constructors within a class definition. */
7656 error ("only declarations of constructors can be %<explicit%>");
7660 if (storage_class == sc_mutable)
7662 if (decl_context != FIELD || friendp)
7664 error ("non-member %qs cannot be declared %<mutable%>", name);
7665 storage_class = sc_none;
7667 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
7669 error ("non-object member %qs cannot be declared %<mutable%>", name);
7670 storage_class = sc_none;
7672 else if (TREE_CODE (type) == FUNCTION_TYPE
7673 || TREE_CODE (type) == METHOD_TYPE)
7675 error ("function %qs cannot be declared %<mutable%>", name);
7676 storage_class = sc_none;
7680 error ("static %qs cannot be declared %<mutable%>", name);
7681 storage_class = sc_none;
7683 else if (type_quals & TYPE_QUAL_CONST)
7685 error ("const %qs cannot be declared %<mutable%>", name);
7686 storage_class = sc_none;
7690 /* If this is declaring a typedef name, return a TYPE_DECL. */
7691 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
7695 /* Note that the grammar rejects storage classes
7696 in typenames, fields or parameters. */
7697 if (current_lang_name == lang_name_java)
7698 TYPE_FOR_JAVA (type) = 1;
7700 if (decl_context == FIELD)
7701 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
7703 decl = build_decl (TYPE_DECL, unqualified_id, type);
7704 if (id_declarator && declarator->u.id.qualifying_scope)
7705 error ("%Jtypedef name may not be a nested-name-specifier", decl);
7707 if (decl_context != FIELD)
7709 if (!current_function_decl)
7710 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
7711 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
7712 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
7713 (current_function_decl)))
7714 /* The TYPE_DECL is "abstract" because there will be
7715 clones of this constructor/destructor, and there will
7716 be copies of this TYPE_DECL generated in those
7718 DECL_ABSTRACT (decl) = 1;
7720 else if (constructor_name_p (unqualified_id, current_class_type))
7721 pedwarn ("ISO C++ forbids nested type %qD with same name "
7722 "as enclosing class",
7725 /* If the user declares "typedef struct {...} foo" then the
7726 struct will have an anonymous name. Fill that name in now.
7727 Nothing can refer to it, so nothing needs know about the name
7729 if (type != error_mark_node
7732 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
7733 && TYPE_ANONYMOUS_P (type)
7734 /* Don't do this if there are attributes. */
7735 && (!attrlist || !*attrlist)
7736 && cp_type_quals (type) == TYPE_UNQUALIFIED)
7738 tree oldname = TYPE_NAME (type);
7741 /* Replace the anonymous name with the real name everywhere. */
7742 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
7743 if (TYPE_NAME (t) == oldname)
7744 TYPE_NAME (t) = decl;
7746 if (TYPE_LANG_SPECIFIC (type))
7747 TYPE_WAS_ANONYMOUS (type) = 1;
7749 /* If this is a typedef within a template class, the nested
7750 type is a (non-primary) template. The name for the
7751 template needs updating as well. */
7752 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
7753 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
7754 = TYPE_IDENTIFIER (type);
7756 /* FIXME remangle member functions; member functions of a
7757 type with external linkage have external linkage. */
7762 if (ctype == NULL_TREE)
7764 if (TREE_CODE (type) == METHOD_TYPE)
7765 ctype = TYPE_METHOD_BASETYPE (type);
7766 /* Any qualifiers on a function type typedef have
7767 already been dealt with. */
7768 else if (TREE_CODE (type) == FUNCTION_TYPE)
7769 quals = TYPE_UNQUALIFIED;
7771 if (ctype != NULL_TREE)
7772 grok_method_quals (ctype, decl, quals);
7776 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
7777 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
7779 bad_specifiers (decl, "type", virtualp, quals != TYPE_UNQUALIFIED,
7780 inlinep, friendp, raises != NULL_TREE);
7785 /* Detect the case of an array type of unspecified size
7786 which came, as such, direct from a typedef name.
7787 We must copy the type, so that the array's domain can be
7788 individually set by the object's initializer. */
7790 if (type && typedef_type
7791 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
7792 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
7793 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
7795 /* Detect where we're using a typedef of function type to declare a
7796 function. PARMS will not be set, so we must create it now. */
7798 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
7800 tree decls = NULL_TREE;
7803 for (args = TYPE_ARG_TYPES (type); args; args = TREE_CHAIN (args))
7805 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
7807 TREE_CHAIN (decl) = decls;
7811 parms = nreverse (decls);
7813 if (decl_context != TYPENAME)
7815 /* A cv-qualifier-seq shall only be part of the function type
7816 for a non-static member function. [8.3.5/4 dcl.fct] */
7817 if (cp_type_quals (type) != TYPE_UNQUALIFIED
7818 && (current_class_type == NULL_TREE || staticp) )
7820 error ("qualified function types cannot be used to declare %s functions",
7821 (staticp? "static member" : "free"));
7822 type = TYPE_MAIN_VARIANT (type);
7825 /* The qualifiers on the function type become the qualifiers on
7826 the non-static member function. */
7827 quals |= cp_type_quals (type);
7831 /* If this is a type name (such as, in a cast or sizeof),
7832 compute the type and return it now. */
7834 if (decl_context == TYPENAME)
7836 /* Note that the grammar rejects storage classes
7837 in typenames, fields or parameters. */
7838 if (type_quals != TYPE_UNQUALIFIED)
7839 type_quals = TYPE_UNQUALIFIED;
7841 /* Special case: "friend class foo" looks like a TYPENAME context. */
7844 if (type_quals != TYPE_UNQUALIFIED)
7846 error ("type qualifiers specified for friend class declaration");
7847 type_quals = TYPE_UNQUALIFIED;
7851 error ("%<inline%> specified for friend class declaration");
7857 /* Don't allow friend declaration without a class-key. */
7858 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
7859 pedwarn ("template parameters cannot be friends");
7860 else if (TREE_CODE (type) == TYPENAME_TYPE)
7861 pedwarn ("friend declaration requires class-key, "
7862 "i.e. %<friend class %T::%D%>",
7863 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
7865 pedwarn ("friend declaration requires class-key, "
7866 "i.e. %<friend %#T%>",
7870 /* Only try to do this stuff if we didn't already give up. */
7871 if (type != integer_type_node)
7873 /* A friendly class? */
7874 if (current_class_type)
7875 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
7878 error ("trying to make class %qT a friend of global scope",
7881 type = void_type_node;
7886 if (ctype == NULL_TREE)
7888 if (TREE_CODE (type) != METHOD_TYPE)
7889 error ("invalid qualifiers on non-member function type");
7891 ctype = TYPE_METHOD_BASETYPE (type);
7895 tree dummy = build_decl (TYPE_DECL, unqualified_id, type);
7896 grok_method_quals (ctype, dummy, quals);
7897 type = TREE_TYPE (dummy);
7903 else if (unqualified_id == NULL_TREE && decl_context != PARM
7904 && decl_context != CATCHPARM
7905 && TREE_CODE (type) != UNION_TYPE
7908 error ("abstract declarator %qT used as declaration", type);
7909 return error_mark_node;
7912 /* Only functions may be declared using an operator-function-id. */
7914 && IDENTIFIER_OPNAME_P (unqualified_id)
7915 && TREE_CODE (type) != FUNCTION_TYPE
7916 && TREE_CODE (type) != METHOD_TYPE)
7918 error ("declaration of %qD as non-function", unqualified_id);
7919 return error_mark_node;
7922 /* We don't check parameter types here because we can emit a better
7923 error message later. */
7924 if (decl_context != PARM)
7925 type = check_var_type (unqualified_id, type);
7927 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
7928 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
7930 if (decl_context == PARM || decl_context == CATCHPARM)
7932 if (ctype || in_namespace)
7933 error ("cannot use %<::%> in parameter declaration");
7935 /* A parameter declared as an array of T is really a pointer to T.
7936 One declared as a function is really a pointer to a function.
7937 One declared as a member is really a pointer to member. */
7939 if (TREE_CODE (type) == ARRAY_TYPE)
7941 /* Transfer const-ness of array into that of type pointed to. */
7942 type = build_pointer_type (TREE_TYPE (type));
7943 type_quals = TYPE_UNQUALIFIED;
7945 else if (TREE_CODE (type) == FUNCTION_TYPE)
7946 type = build_pointer_type (type);
7952 if (decl_context == PARM)
7954 decl = cp_build_parm_decl (unqualified_id, type);
7956 bad_specifiers (decl, "parameter", virtualp, quals != TYPE_UNQUALIFIED,
7957 inlinep, friendp, raises != NULL_TREE);
7959 else if (decl_context == FIELD)
7961 /* The C99 flexible array extension. */
7962 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
7963 && TYPE_DOMAIN (type) == NULL_TREE)
7965 tree itype = compute_array_index_type (dname, integer_zero_node);
7966 type = build_cplus_array_type (TREE_TYPE (type), itype);
7969 if (type == error_mark_node)
7971 /* Happens when declaring arrays of sizes which
7972 are error_mark_node, for example. */
7975 else if (in_namespace && !friendp)
7977 /* Something like struct S { int N::j; }; */
7978 error ("invalid use of %<::%>");
7981 else if (TREE_CODE (type) == FUNCTION_TYPE)
7984 tree function_context;
7988 if (ctype == NULL_TREE)
7989 ctype = current_class_type;
7991 if (ctype == NULL_TREE)
7993 error ("can't make %qD into a method -- not in a class",
7995 return void_type_node;
7998 /* ``A union may [ ... ] not [ have ] virtual functions.''
8000 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
8002 error ("function %qD declared virtual inside a union",
8004 return void_type_node;
8007 if (NEW_DELETE_OPNAME_P (unqualified_id))
8011 error ("%qD cannot be declared virtual, since it "
8017 else if (staticp < 2)
8018 type = build_method_type_directly (ctype,
8020 TYPE_ARG_TYPES (type));
8023 /* Check that the name used for a destructor makes sense. */
8024 if (sfk == sfk_destructor
8025 && !same_type_p (TREE_OPERAND
8026 (id_declarator->u.id.unqualified_name, 0),
8029 error ("declaration of %qD as member of %qT",
8030 id_declarator->u.id.unqualified_name,
8032 return error_mark_node;
8035 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
8036 function_context = (ctype != NULL_TREE) ?
8037 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
8038 publicp = (! friendp || ! staticp)
8039 && function_context == NULL_TREE;
8040 decl = grokfndecl (ctype, type,
8041 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
8042 ? unqualified_id : dname,
8045 virtualp, flags, quals, raises,
8046 friendp ? -1 : 0, friendp, publicp, inlinep,
8048 funcdef_flag, template_count, in_namespace, attrlist);
8049 if (decl == NULL_TREE)
8052 /* This clobbers the attrs stored in `decl' from `attrlist'. */
8053 /* The decl and setting of decl_attr is also turned off. */
8054 decl = build_decl_attribute_variant (decl, decl_attr);
8057 /* [class.conv.ctor]
8059 A constructor declared without the function-specifier
8060 explicit that can be called with a single parameter
8061 specifies a conversion from the type of its first
8062 parameter to the type of its class. Such a constructor
8063 is called a converting constructor. */
8065 DECL_NONCONVERTING_P (decl) = 1;
8066 else if (DECL_CONSTRUCTOR_P (decl))
8068 /* The constructor can be called with exactly one
8069 parameter if there is at least one parameter, and
8070 any subsequent parameters have default arguments.
8071 Ignore any compiler-added parms. */
8072 tree arg_types = FUNCTION_FIRST_USER_PARMTYPE (decl);
8074 if (arg_types == void_list_node
8076 && TREE_CHAIN (arg_types)
8077 && TREE_CHAIN (arg_types) != void_list_node
8078 && !TREE_PURPOSE (TREE_CHAIN (arg_types))))
8079 DECL_NONCONVERTING_P (decl) = 1;
8082 else if (TREE_CODE (type) == METHOD_TYPE)
8084 /* We only get here for friend declarations of
8085 members of other classes. */
8086 /* All method decls are public, so tell grokfndecl to set
8087 TREE_PUBLIC, also. */
8088 decl = grokfndecl (ctype, type,
8089 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
8090 ? unqualified_id : dname,
8093 virtualp, flags, quals, raises,
8094 friendp ? -1 : 0, friendp, 1, 0, sfk,
8095 funcdef_flag, template_count, in_namespace,
8097 if (decl == NULL_TREE)
8100 else if (!staticp && !dependent_type_p (type)
8101 && !COMPLETE_TYPE_P (complete_type (type))
8102 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
8105 error ("field %qD has incomplete type", unqualified_id);
8107 error ("name %qT has incomplete type", type);
8109 /* If we're instantiating a template, tell them which
8110 instantiation made the field's type be incomplete. */
8111 if (current_class_type
8112 && TYPE_NAME (current_class_type)
8113 && IDENTIFIER_TEMPLATE (TYPE_IDENTIFIER (current_class_type))
8115 && declspecs->type == type)
8116 error (" in instantiation of template %qT",
8117 current_class_type);
8119 type = error_mark_node;
8126 error ("%qE is neither function nor member function; "
8127 "cannot be declared friend", unqualified_id);
8135 /* Friends are treated specially. */
8136 if (ctype == current_class_type)
8137 warning (0, "member functions are implicitly friends of their class");
8138 else if (decl && DECL_NAME (decl))
8140 if (template_class_depth (current_class_type) == 0)
8142 decl = check_explicit_specialization
8143 (unqualified_id, decl, template_count,
8144 2 * (funcdef_flag != 0) + 4);
8145 if (decl == error_mark_node)
8146 return error_mark_node;
8149 decl = do_friend (ctype, unqualified_id, decl,
8150 *attrlist, flags, quals, funcdef_flag);
8154 return void_type_node;
8157 /* Structure field. It may not be a function, except for C++. */
8159 if (decl == NULL_TREE)
8165 /* An attempt is being made to initialize a non-static
8166 member. But, from [class.mem]:
8168 4 A member-declarator can contain a
8169 constant-initializer only if it declares a static
8170 member (_class.static_) of integral or enumeration
8171 type, see _class.static.data_.
8173 This used to be relatively common practice, but
8174 the rest of the compiler does not correctly
8175 handle the initialization unless the member is
8176 static so we make it static below. */
8177 pedwarn ("ISO C++ forbids initialization of member %qD",
8179 pedwarn ("making %qD static", unqualified_id);
8183 if (uses_template_parms (type))
8184 /* We'll check at instantiation time. */
8186 else if (check_static_variable_definition (unqualified_id,
8188 /* If we just return the declaration, crashes
8189 will sometimes occur. We therefore return
8190 void_type_node, as if this was a friend
8191 declaration, to cause callers to completely
8192 ignore this declaration. */
8193 return void_type_node;
8198 /* C++ allows static class members. All other work
8199 for this is done by grokfield. */
8200 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
8201 set_linkage_for_static_data_member (decl);
8202 /* Even if there is an in-class initialization, DECL
8203 is considered undefined until an out-of-class
8204 definition is provided. */
8205 DECL_EXTERNAL (decl) = 1;
8209 decl = build_decl (FIELD_DECL, unqualified_id, type);
8210 DECL_NONADDRESSABLE_P (decl) = bitfield;
8211 if (storage_class == sc_mutable)
8213 DECL_MUTABLE_P (decl) = 1;
8214 storage_class = sc_none;
8218 bad_specifiers (decl, "field", virtualp, quals != TYPE_UNQUALIFIED,
8219 inlinep, friendp, raises != NULL_TREE);
8222 else if (TREE_CODE (type) == FUNCTION_TYPE
8223 || TREE_CODE (type) == METHOD_TYPE)
8228 if (!unqualified_id)
8231 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
8232 original_name = dname;
8234 original_name = unqualified_id;
8236 if (storage_class == sc_auto)
8237 error ("storage class %<auto%> invalid for function %qs", name);
8238 else if (storage_class == sc_register)
8239 error ("storage class %<register%> invalid for function %qs", name);
8241 error ("storage class %<__thread%> invalid for function %qs", name);
8243 /* Function declaration not at top level.
8244 Storage classes other than `extern' are not allowed
8245 and `extern' makes no difference. */
8246 if (! toplevel_bindings_p ()
8247 && (storage_class == sc_static
8248 || declspecs->specs[(int)ds_inline])
8251 if (storage_class == sc_static)
8252 pedwarn ("%<static%> specified invalid for function %qs "
8253 "declared out of global scope", name);
8255 pedwarn ("%<inline%> specifier invalid for function %qs "
8256 "declared out of global scope", name);
8259 if (ctype == NULL_TREE)
8263 error ("virtual non-class function %qs", name);
8267 else if (TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
8268 && !NEW_DELETE_OPNAME_P (original_name))
8269 type = build_method_type_directly (ctype,
8271 TYPE_ARG_TYPES (type));
8273 /* Record presence of `static'. */
8274 publicp = (ctype != NULL_TREE
8275 || storage_class == sc_extern
8276 || storage_class != sc_static);
8278 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
8279 virtualp, flags, quals, raises,
8281 publicp, inlinep, sfk, funcdef_flag,
8282 template_count, in_namespace, attrlist);
8283 if (decl == NULL_TREE)
8288 int invalid_static = 0;
8290 /* Don't allow a static member function in a class, and forbid
8291 declaring main to be static. */
8292 if (TREE_CODE (type) == METHOD_TYPE)
8294 pedwarn ("cannot declare member function %qD to have "
8295 "static linkage", decl);
8298 else if (current_function_decl)
8300 /* FIXME need arm citation */
8301 error ("cannot declare static function inside another function");
8308 storage_class = sc_none;
8314 /* It's a variable. */
8316 /* An uninitialized decl with `extern' is a reference. */
8317 decl = grokvardecl (type, unqualified_id,
8320 (type_quals & TYPE_QUAL_CONST) != 0,
8321 ctype ? ctype : in_namespace);
8322 bad_specifiers (decl, "variable", virtualp, quals != TYPE_UNQUALIFIED,
8323 inlinep, friendp, raises != NULL_TREE);
8327 DECL_CONTEXT (decl) = ctype;
8330 pedwarn ("%<static%> may not be used when defining "
8331 "(as opposed to declaring) a static data member");
8333 storage_class = sc_none;
8335 if (storage_class == sc_register && TREE_STATIC (decl))
8337 error ("static member %qD declared %<register%>", decl);
8338 storage_class = sc_none;
8340 if (storage_class == sc_extern && pedantic)
8342 pedwarn ("cannot explicitly declare member %q#D to have "
8345 storage_class = sc_none;
8350 /* Record `register' declaration for warnings on &
8351 and in case doing stupid register allocation. */
8353 if (storage_class == sc_register)
8354 DECL_REGISTER (decl) = 1;
8355 else if (storage_class == sc_extern)
8356 DECL_THIS_EXTERN (decl) = 1;
8357 else if (storage_class == sc_static)
8358 DECL_THIS_STATIC (decl) = 1;
8360 /* Record constancy and volatility. There's no need to do this
8361 when processing a template; we'll do this for the instantiated
8362 declaration based on the type of DECL. */
8363 if (!processing_template_decl)
8364 cp_apply_type_quals_to_decl (type_quals, decl);
8370 /* Subroutine of start_function. Ensure that each of the parameter
8371 types (as listed in PARMS) is complete, as is required for a
8372 function definition. */
8375 require_complete_types_for_parms (tree parms)
8377 for (; parms; parms = TREE_CHAIN (parms))
8379 if (dependent_type_p (TREE_TYPE (parms)))
8381 if (!VOID_TYPE_P (TREE_TYPE (parms))
8382 && complete_type_or_else (TREE_TYPE (parms), parms))
8384 relayout_decl (parms);
8385 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
8388 /* grokparms or complete_type_or_else will have already issued
8390 TREE_TYPE (parms) = error_mark_node;
8394 /* Returns nonzero if T is a local variable. */
8397 local_variable_p (tree t)
8399 if ((TREE_CODE (t) == VAR_DECL
8400 /* A VAR_DECL with a context that is a _TYPE is a static data
8402 && !TYPE_P (CP_DECL_CONTEXT (t))
8403 /* Any other non-local variable must be at namespace scope. */
8404 && !DECL_NAMESPACE_SCOPE_P (t))
8405 || (TREE_CODE (t) == PARM_DECL))
8411 /* Returns nonzero if T is an automatic local variable or a label.
8412 (These are the declarations that need to be remapped when the code
8413 containing them is duplicated.) */
8416 nonstatic_local_decl_p (tree t)
8418 return ((local_variable_p (t) && !TREE_STATIC (t))
8419 || TREE_CODE (t) == LABEL_DECL
8420 || TREE_CODE (t) == RESULT_DECL);
8423 /* Like local_variable_p, but suitable for use as a tree-walking
8427 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
8428 void *data ATTRIBUTE_UNUSED)
8430 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
8432 else if (TYPE_P (*tp))
8439 /* Check that ARG, which is a default-argument expression for a
8440 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
8441 something goes wrong. DECL may also be a _TYPE node, rather than a
8442 DECL, if there is no DECL available. */
8445 check_default_argument (tree decl, tree arg)
8450 if (TREE_CODE (arg) == DEFAULT_ARG)
8451 /* We get a DEFAULT_ARG when looking at an in-class declaration
8452 with a default argument. Ignore the argument for now; we'll
8453 deal with it after the class is complete. */
8462 decl_type = TREE_TYPE (decl);
8464 if (arg == error_mark_node
8465 || decl == error_mark_node
8466 || TREE_TYPE (arg) == error_mark_node
8467 || decl_type == error_mark_node)
8468 /* Something already went wrong. There's no need to check
8470 return error_mark_node;
8472 /* [dcl.fct.default]
8474 A default argument expression is implicitly converted to the
8476 if (!TREE_TYPE (arg)
8477 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
8480 error ("default argument for %q#D has type %qT",
8481 decl, TREE_TYPE (arg));
8483 error ("default argument for parameter of type %qT has type %qT",
8484 decl_type, TREE_TYPE (arg));
8486 return error_mark_node;
8489 /* [dcl.fct.default]
8491 Local variables shall not be used in default argument
8494 The keyword `this' shall not be used in a default argument of a
8496 var = walk_tree_without_duplicates (&arg, local_variable_p_walkfn,
8500 error ("default argument %qE uses local variable %qD", arg, var);
8501 return error_mark_node;
8508 /* Decode the list of parameter types for a function type.
8509 Given the list of things declared inside the parens,
8510 return a list of types.
8512 If this parameter does not end with an ellipsis, we append
8515 *PARMS is set to the chain of PARM_DECLs created. */
8518 grokparms (cp_parameter_declarator *first_parm, tree *parms)
8520 tree result = NULL_TREE;
8521 tree decls = NULL_TREE;
8522 int ellipsis = !first_parm || first_parm->ellipsis_p;
8523 cp_parameter_declarator *parm;
8526 for (parm = first_parm; parm != NULL; parm = parm->next)
8528 tree type = NULL_TREE;
8529 tree init = parm->default_argument;
8533 if (parm == no_parameters)
8536 attrs = parm->decl_specifiers.attributes;
8537 parm->decl_specifiers.attributes = NULL_TREE;
8538 decl = grokdeclarator (parm->declarator, &parm->decl_specifiers,
8539 PARM, init != NULL_TREE, &attrs);
8540 if (! decl || TREE_TYPE (decl) == error_mark_node)
8544 cplus_decl_attributes (&decl, attrs, 0);
8546 type = TREE_TYPE (decl);
8547 if (VOID_TYPE_P (type))
8549 if (same_type_p (type, void_type_node)
8550 && !DECL_NAME (decl) && !result && !parm->next && !ellipsis)
8551 /* this is a parmlist of `(void)', which is ok. */
8553 cxx_incomplete_type_error (decl, type);
8554 /* It's not a good idea to actually create parameters of
8555 type `void'; other parts of the compiler assume that a
8556 void type terminates the parameter list. */
8557 type = error_mark_node;
8558 TREE_TYPE (decl) = error_mark_node;
8561 if (type != error_mark_node)
8563 /* Top-level qualifiers on the parameters are
8564 ignored for function types. */
8565 type = cp_build_qualified_type (type, 0);
8566 if (TREE_CODE (type) == METHOD_TYPE)
8568 error ("parameter %qD invalidly declared method type", decl);
8569 type = build_pointer_type (type);
8570 TREE_TYPE (decl) = type;
8572 else if (abstract_virtuals_error (decl, type))
8573 any_error = 1; /* Seems like a good idea. */
8574 else if (POINTER_TYPE_P (type))
8576 /* [dcl.fct]/6, parameter types cannot contain pointers
8577 (references) to arrays of unknown bound. */
8578 tree t = TREE_TYPE (type);
8579 int ptr = TYPE_PTR_P (type);
8585 else if (TREE_CODE (t) != ARRAY_TYPE)
8587 else if (!TYPE_DOMAIN (t))
8591 if (TREE_CODE (t) == ARRAY_TYPE)
8592 error ("parameter %qD includes %s to array of unknown "
8594 decl, ptr ? "pointer" : "reference", t);
8599 else if (init && !processing_template_decl)
8600 init = check_default_argument (decl, init);
8603 TREE_CHAIN (decl) = decls;
8605 result = tree_cons (init, type, result);
8607 decls = nreverse (decls);
8608 result = nreverse (result);
8610 result = chainon (result, void_list_node);
8617 /* D is a constructor or overloaded `operator='.
8619 Let T be the class in which D is declared. Then, this function
8622 -1 if D's is an ill-formed constructor or copy assignment operator
8623 whose first parameter is of type `T'.
8624 0 if D is not a copy constructor or copy assignment
8626 1 if D is a copy constructor or copy assignment operator whose
8627 first parameter is a reference to const qualified T.
8628 2 if D is a copy constructor or copy assignment operator whose
8629 first parameter is a reference to non-const qualified T.
8631 This function can be used as a predicate. Positive values indicate
8632 a copy constructor and nonzero values indicate a copy assignment
8642 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
8644 if (DECL_TEMPLATE_INFO (d)
8645 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d)))
8646 /* Instantiations of template member functions are never copy
8647 functions. Note that member functions of templated classes are
8648 represented as template functions internally, and we must
8649 accept those as copy functions. */
8652 args = FUNCTION_FIRST_USER_PARMTYPE (d);
8656 arg_type = TREE_VALUE (args);
8658 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
8660 /* Pass by value copy assignment operator. */
8663 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
8664 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
8666 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
8672 args = TREE_CHAIN (args);
8674 if (args && args != void_list_node && !TREE_PURPOSE (args))
8675 /* There are more non-optional args. */
8681 /* Remember any special properties of member function DECL. */
8683 void grok_special_member_properties (tree decl)
8685 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P(decl))
8686 ; /* Not special. */
8687 else if (DECL_CONSTRUCTOR_P (decl))
8689 int ctor = copy_fn_p (decl);
8695 A non-template constructor for class X is a copy
8696 constructor if its first parameter is of type X&, const
8697 X&, volatile X& or const volatile X&, and either there
8698 are no other parameters or else all other parameters have
8699 default arguments. */
8700 TYPE_HAS_INIT_REF (DECL_CONTEXT (decl)) = 1;
8702 TYPE_HAS_CONST_INIT_REF (DECL_CONTEXT (decl)) = 1;
8704 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
8705 TYPE_HAS_DEFAULT_CONSTRUCTOR (DECL_CONTEXT (decl)) = 1;
8707 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
8711 A non-template assignment operator for class X is a copy
8712 assignment operator if its parameter is of type X, X&, const
8713 X&, volatile X& or const volatile X&. */
8715 int assop = copy_fn_p (decl);
8719 TYPE_HAS_ASSIGN_REF (DECL_CONTEXT (decl)) = 1;
8721 TYPE_HAS_CONST_ASSIGN_REF (DECL_CONTEXT (decl)) = 1;
8726 /* Check a constructor DECL has the correct form. Complains
8727 if the class has a constructor of the form X(X). */
8730 grok_ctor_properties (tree ctype, tree decl)
8732 int ctor_parm = copy_fn_p (decl);
8738 A declaration of a constructor for a class X is ill-formed if
8739 its first parameter is of type (optionally cv-qualified) X
8740 and either there are no other parameters or else all other
8741 parameters have default arguments.
8743 We *don't* complain about member template instantiations that
8744 have this form, though; they can occur as we try to decide
8745 what constructor to use during overload resolution. Since
8746 overload resolution will never prefer such a constructor to
8747 the non-template copy constructor (which is either explicitly
8748 or implicitly defined), there's no need to worry about their
8749 existence. Theoretically, they should never even be
8750 instantiated, but that's hard to forestall. */
8751 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
8759 /* An operator with this code is unary, but can also be binary. */
8762 ambi_op_p (enum tree_code code)
8764 return (code == INDIRECT_REF
8765 || code == ADDR_EXPR
8766 || code == UNARY_PLUS_EXPR
8767 || code == NEGATE_EXPR
8768 || code == PREINCREMENT_EXPR
8769 || code == PREDECREMENT_EXPR);
8772 /* An operator with this name can only be unary. */
8775 unary_op_p (enum tree_code code)
8777 return (code == TRUTH_NOT_EXPR
8778 || code == BIT_NOT_EXPR
8779 || code == COMPONENT_REF
8780 || code == TYPE_EXPR);
8783 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
8784 errors are issued for invalid declarations. */
8787 grok_op_properties (tree decl, bool complain)
8789 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
8791 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
8792 tree name = DECL_NAME (decl);
8793 enum tree_code operator_code;
8797 /* Count the number of arguments. */
8798 for (argtype = argtypes, arity = 0;
8799 argtype && argtype != void_list_node;
8800 argtype = TREE_CHAIN (argtype))
8803 class_type = DECL_CONTEXT (decl);
8804 if (class_type && !CLASS_TYPE_P (class_type))
8805 class_type = NULL_TREE;
8807 if (DECL_CONV_FN_P (decl))
8808 operator_code = TYPE_EXPR;
8812 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
8813 if (ansi_opname (CODE) == name) \
8815 operator_code = (CODE); \
8818 else if (ansi_assopname (CODE) == name) \
8820 operator_code = (CODE); \
8821 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
8825 #include "operators.def"
8831 gcc_assert (operator_code != LAST_CPLUS_TREE_CODE);
8832 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
8835 switch (operator_code)
8838 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
8842 TYPE_GETS_DELETE (class_type) |= 1;
8846 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
8849 case VEC_DELETE_EXPR:
8850 TYPE_GETS_DELETE (class_type) |= 2;
8857 /* [basic.std.dynamic.allocation]/1:
8859 A program is ill-formed if an allocation function is declared
8860 in a namespace scope other than global scope or declared static
8863 The same also holds true for deallocation functions. */
8864 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
8865 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
8867 if (DECL_NAMESPACE_SCOPE_P (decl))
8869 if (CP_DECL_CONTEXT (decl) != global_namespace)
8870 error ("%qD may not be declared within a namespace", decl);
8871 else if (!TREE_PUBLIC (decl))
8872 error ("%qD may not be declared as static", decl);
8876 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
8877 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
8878 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
8879 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
8882 /* An operator function must either be a non-static member function
8883 or have at least one parameter of a class, a reference to a class,
8884 an enumeration, or a reference to an enumeration. 13.4.0.6 */
8885 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
8887 if (operator_code == TYPE_EXPR
8888 || operator_code == CALL_EXPR
8889 || operator_code == COMPONENT_REF
8890 || operator_code == ARRAY_REF
8891 || operator_code == NOP_EXPR)
8893 error ("%qD must be a nonstatic member function", decl);
8900 if (DECL_STATIC_FUNCTION_P (decl))
8902 error ("%qD must be either a non-static member "
8903 "function or a non-member function", decl);
8907 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
8909 tree arg = non_reference (TREE_VALUE (p));
8910 /* IS_AGGR_TYPE, rather than CLASS_TYPE_P, is used
8911 because these checks are performed even on
8912 template functions. */
8913 if (IS_AGGR_TYPE (arg) || TREE_CODE (arg) == ENUMERAL_TYPE)
8917 if (!p || p == void_list_node)
8922 error ("%qD must have an argument of class or "
8929 /* There are no restrictions on the arguments to an overloaded
8931 if (operator_code == CALL_EXPR)
8934 /* Warn about conversion operators that will never be used. */
8935 if (IDENTIFIER_TYPENAME_P (name)
8936 && ! DECL_TEMPLATE_INFO (decl)
8938 /* Warn only declaring the function; there is no need to
8939 warn again about out-of-class definitions. */
8940 && class_type == current_class_type)
8942 tree t = TREE_TYPE (name);
8943 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
8944 const char *what = 0;
8947 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
8949 if (TREE_CODE (t) == VOID_TYPE)
8951 else if (class_type)
8953 if (t == class_type)
8954 what = "the same type";
8955 /* Don't force t to be complete here. */
8956 else if (IS_AGGR_TYPE (t)
8957 && COMPLETE_TYPE_P (t)
8958 && DERIVED_FROM_P (t, class_type))
8959 what = "a base class";
8963 warning (0, "conversion to %s%s will never use a type "
8964 "conversion operator",
8965 ref ? "a reference to " : "", what);
8967 if (operator_code == COND_EXPR)
8970 error ("ISO C++ prohibits overloading operator ?:");
8972 else if (ambi_op_p (operator_code))
8975 /* We pick the one-argument operator codes by default, so
8976 we don't have to change anything. */
8978 else if (arity == 2)
8980 /* If we thought this was a unary operator, we now know
8981 it to be a binary operator. */
8982 switch (operator_code)
8985 operator_code = MULT_EXPR;
8989 operator_code = BIT_AND_EXPR;
8992 case UNARY_PLUS_EXPR:
8993 operator_code = PLUS_EXPR;
8997 operator_code = MINUS_EXPR;
9000 case PREINCREMENT_EXPR:
9001 operator_code = POSTINCREMENT_EXPR;
9004 case PREDECREMENT_EXPR:
9005 operator_code = POSTDECREMENT_EXPR;
9012 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
9014 if ((operator_code == POSTINCREMENT_EXPR
9015 || operator_code == POSTDECREMENT_EXPR)
9016 && ! processing_template_decl
9017 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
9020 error ("postfix %qD must take %<int%> as its argument",
9024 ("postfix %qD must take %<int%> as its second argument",
9031 error ("%qD must take either zero or one argument", decl);
9033 error ("%qD must take either one or two arguments", decl);
9036 /* More Effective C++ rule 6. */
9038 && (operator_code == POSTINCREMENT_EXPR
9039 || operator_code == POSTDECREMENT_EXPR
9040 || operator_code == PREINCREMENT_EXPR
9041 || operator_code == PREDECREMENT_EXPR))
9043 tree arg = TREE_VALUE (argtypes);
9044 tree ret = TREE_TYPE (TREE_TYPE (decl));
9045 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
9046 arg = TREE_TYPE (arg);
9047 arg = TYPE_MAIN_VARIANT (arg);
9048 if (operator_code == PREINCREMENT_EXPR
9049 || operator_code == PREDECREMENT_EXPR)
9051 if (TREE_CODE (ret) != REFERENCE_TYPE
9052 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
9054 warning (0, "prefix %qD should return %qT", decl,
9055 build_reference_type (arg));
9059 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
9060 warning (0, "postfix %qD should return %qT", decl, arg);
9064 else if (unary_op_p (operator_code))
9069 error ("%qD must take %<void%>", decl);
9071 error ("%qD must take exactly one argument", decl);
9074 else /* if (binary_op_p (operator_code)) */
9079 error ("%qD must take exactly one argument", decl);
9081 error ("%qD must take exactly two arguments", decl);
9084 /* More Effective C++ rule 7. */
9086 && (operator_code == TRUTH_ANDIF_EXPR
9087 || operator_code == TRUTH_ORIF_EXPR
9088 || operator_code == COMPOUND_EXPR))
9089 warning (0, "user-defined %qD always evaluates both arguments",
9093 /* Effective C++ rule 23. */
9096 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
9097 && (operator_code == PLUS_EXPR
9098 || operator_code == MINUS_EXPR
9099 || operator_code == TRUNC_DIV_EXPR
9100 || operator_code == MULT_EXPR
9101 || operator_code == TRUNC_MOD_EXPR)
9102 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
9103 warning (0, "%qD should return by value", decl);
9106 for (; argtypes && argtypes != void_list_node;
9107 argtypes = TREE_CHAIN (argtypes))
9108 if (TREE_PURPOSE (argtypes))
9110 TREE_PURPOSE (argtypes) = NULL_TREE;
9111 if (operator_code == POSTINCREMENT_EXPR
9112 || operator_code == POSTDECREMENT_EXPR)
9115 pedwarn ("%qD cannot have default arguments", decl);
9118 error ("%qD cannot have default arguments", decl);
9125 /* Return a string giving the keyword associate with CODE. */
9128 tag_name (enum tag_types code)
9147 /* Name lookup in an elaborated-type-specifier (after the keyword
9148 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
9149 elaborated-type-specifier is invalid, issue a diagnostic and return
9150 error_mark_node; otherwise, return the *_TYPE to which it referred.
9151 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
9154 check_elaborated_type_specifier (enum tag_types tag_code,
9156 bool allow_template_p)
9162 struct S { struct S *p; };
9164 name lookup will find the TYPE_DECL for the implicit "S::S"
9165 typedef. Adjust for that here. */
9166 if (DECL_SELF_REFERENCE_P (decl))
9167 decl = TYPE_NAME (TREE_TYPE (decl));
9169 type = TREE_TYPE (decl);
9171 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
9172 is false for this case as well. */
9173 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
9175 error ("using template type parameter %qT after %qs",
9176 type, tag_name (tag_code));
9177 return error_mark_node;
9181 If the identifier resolves to a typedef-name or a template
9182 type-parameter, the elaborated-type-specifier is ill-formed.
9184 In other words, the only legitimate declaration to use in the
9185 elaborated type specifier is the implicit typedef created when
9186 the type is declared. */
9187 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
9188 && tag_code != typename_type)
9190 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
9191 error ("%q+D has a previous declaration here", decl);
9192 return error_mark_node;
9194 else if (TREE_CODE (type) != RECORD_TYPE
9195 && TREE_CODE (type) != UNION_TYPE
9196 && tag_code != enum_type
9197 && tag_code != typename_type)
9199 error ("%qT referred to as %qs", type, tag_name (tag_code));
9200 error ("%q+T has a previous declaration here", type);
9201 return error_mark_node;
9203 else if (TREE_CODE (type) != ENUMERAL_TYPE
9204 && tag_code == enum_type)
9206 error ("%qT referred to as enum", type);
9207 error ("%q+T has a previous declaration here", type);
9208 return error_mark_node;
9210 else if (!allow_template_p
9211 && TREE_CODE (type) == RECORD_TYPE
9212 && CLASSTYPE_IS_TEMPLATE (type))
9214 /* If a class template appears as elaborated type specifier
9215 without a template header such as:
9217 template <class T> class C {};
9218 void f(class C); // No template header here
9220 then the required template argument is missing. */
9221 error ("template argument required for %<%s %T%>",
9222 tag_name (tag_code),
9223 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
9224 return error_mark_node;
9230 /* Lookup NAME in elaborate type specifier in scope according to
9231 SCOPE and issue diagnostics if necessary.
9232 Return *_TYPE node upon success, NULL_TREE when the NAME is not
9233 found, and ERROR_MARK_NODE for type error. */
9236 lookup_and_check_tag (enum tag_types tag_code, tree name,
9237 tag_scope scope, bool template_header_p)
9241 if (scope == ts_global)
9243 /* First try ordinary name lookup, ignoring hidden class name
9244 injected via friend declaration. */
9245 decl = lookup_name (name, 2);
9246 /* If that fails, the name will be placed in the smallest
9247 non-class, non-function-prototype scope according to 3.3.1/5.
9248 We may already have a hidden name declared as friend in this
9249 scope. So lookup again but not ignoring hidden name.
9250 If we find one, that name will be made visible rather than
9251 creating a new tag. */
9253 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
9256 decl = lookup_type_scope (name, scope);
9258 if (decl && DECL_CLASS_TEMPLATE_P (decl))
9259 decl = DECL_TEMPLATE_RESULT (decl);
9261 if (decl && TREE_CODE (decl) == TYPE_DECL)
9263 /* Look for invalid nested type:
9267 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
9269 error ("%qD has the same name as the class in which it is "
9272 return error_mark_node;
9275 /* Two cases we need to consider when deciding if a class
9276 template is allowed as an elaborated type specifier:
9277 1. It is a self reference to its own class.
9278 2. It comes with a template header.
9282 template <class T> class C {
9283 class C *c1; // DECL_SELF_REFERENCE_P is true
9286 template <class U> class C; // template_header_p is true
9287 template <class T> class C<T>::D {
9288 class C *c2; // DECL_SELF_REFERENCE_P is true
9291 t = check_elaborated_type_specifier (tag_code,
9294 | DECL_SELF_REFERENCE_P (decl));
9301 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
9302 Define the tag as a forward-reference if it is not defined.
9304 If a declaration is given, process it here, and report an error if
9305 multiple declarations are not identical.
9307 SCOPE is TS_CURRENT when this is also a definition. Only look in
9308 the current frame for the name (since C++ allows new names in any
9309 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
9310 declaration. Only look beginning from the current scope outward up
9311 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
9313 TEMPLATE_HEADER_P is true when this declaration is preceded by
9314 a set of template parameters. */
9317 xref_tag (enum tag_types tag_code, tree name,
9318 tag_scope scope, bool template_header_p)
9320 enum tree_code code;
9322 tree context = NULL_TREE;
9324 timevar_push (TV_NAME_LOOKUP);
9326 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
9338 code = ENUMERAL_TYPE;
9344 /* In case of anonymous name, xref_tag is only called to
9345 make type node and push name. Name lookup is not required. */
9346 if (ANON_AGGRNAME_P (name))
9349 t = lookup_and_check_tag (tag_code, name,
9350 scope, template_header_p);
9352 if (t == error_mark_node)
9353 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
9355 if (scope != ts_current && t && current_class_type
9356 && template_class_depth (current_class_type)
9357 && template_header_p)
9359 /* Since SCOPE is not TS_CURRENT, we are not looking at a
9360 definition of this tag. Since, in addition, we are currently
9361 processing a (member) template declaration of a template
9362 class, we must be very careful; consider:
9369 { template <class V>
9370 friend struct S1; };
9372 Here, the S2::S1 declaration should not be confused with the
9373 outer declaration. In particular, the inner version should
9374 have a template parameter of level 2, not level 1. This
9375 would be particularly important if the member declaration
9378 template <class V = U> friend struct S1;
9380 say, when we should tsubst into `U' when instantiating
9381 S2. On the other hand, when presented with:
9391 we must find the inner binding eventually. We
9392 accomplish this by making sure that the new type we
9393 create to represent this declaration has the right
9395 context = TYPE_CONTEXT (t);
9401 /* If no such tag is yet defined, create a forward-reference node
9402 and record it as the "definition".
9403 When a real declaration of this type is found,
9404 the forward-reference will be altered into a real type. */
9405 if (code == ENUMERAL_TYPE)
9407 error ("use of enum %q#D without previous declaration", name);
9408 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
9412 t = make_aggr_type (code);
9413 TYPE_CONTEXT (t) = context;
9414 t = pushtag (name, t, scope);
9419 if (template_header_p && IS_AGGR_TYPE (t))
9420 redeclare_class_template (t, current_template_parms);
9421 else if (!processing_template_decl
9423 && CLASSTYPE_IS_TEMPLATE (t))
9425 error ("redeclaration of %qT as a non-template", t);
9426 t = error_mark_node;
9429 /* Make injected friend class visible. */
9430 if (scope != ts_within_enclosing_non_class
9431 && hidden_name_p (TYPE_NAME (t)))
9433 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
9434 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
9436 if (TYPE_TEMPLATE_INFO (t))
9438 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
9439 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
9444 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t);
9448 xref_tag_from_type (tree old, tree id, tag_scope scope)
9450 enum tag_types tag_kind;
9452 if (TREE_CODE (old) == RECORD_TYPE)
9453 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
9455 tag_kind = union_type;
9457 if (id == NULL_TREE)
9458 id = TYPE_IDENTIFIER (old);
9460 return xref_tag (tag_kind, id, scope, false);
9463 /* Create the binfo hierarchy for REF with (possibly NULL) base list
9464 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
9465 access_* node, and the TREE_VALUE is the type of the base-class.
9466 Non-NULL TREE_TYPE indicates virtual inheritance. */
9469 xref_basetypes (tree ref, tree base_list)
9472 tree binfo, base_binfo;
9473 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
9474 unsigned max_bases = 0; /* Maximum direct bases. */
9476 tree default_access;
9477 tree igo_prev; /* Track Inheritance Graph Order. */
9479 if (ref == error_mark_node)
9482 /* The base of a derived class is private by default, all others are
9484 default_access = (TREE_CODE (ref) == RECORD_TYPE
9485 && CLASSTYPE_DECLARED_CLASS (ref)
9486 ? access_private_node : access_public_node);
9488 /* First, make sure that any templates in base-classes are
9489 instantiated. This ensures that if we call ourselves recursively
9490 we do not get confused about which classes are marked and which
9495 tree basetype = TREE_VALUE (*basep);
9497 if (!(processing_template_decl && uses_template_parms (basetype))
9498 && !complete_type_or_else (basetype, NULL))
9499 /* An incomplete type. Remove it from the list. */
9500 *basep = TREE_CHAIN (*basep);
9504 if (TREE_TYPE (*basep))
9506 if (CLASS_TYPE_P (basetype))
9507 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
9508 basep = &TREE_CHAIN (*basep);
9512 TYPE_MARKED_P (ref) = 1;
9514 /* The binfo slot should be empty, unless this is an (ill-formed)
9516 gcc_assert (!TYPE_BINFO (ref) || TYPE_SIZE (ref));
9517 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
9519 binfo = make_tree_binfo (max_bases);
9521 TYPE_BINFO (ref) = binfo;
9522 BINFO_OFFSET (binfo) = size_zero_node;
9523 BINFO_TYPE (binfo) = ref;
9527 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
9528 /* An aggregate cannot have baseclasses. */
9529 CLASSTYPE_NON_AGGREGATE (ref) = 1;
9531 if (TREE_CODE (ref) == UNION_TYPE)
9532 error ("derived union %qT invalid", ref);
9537 if (TYPE_FOR_JAVA (ref))
9538 error ("Java class %qT cannot have multiple bases", ref);
9543 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
9545 if (TYPE_FOR_JAVA (ref))
9546 error ("Java class %qT cannot have virtual bases", ref);
9549 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
9551 tree access = TREE_PURPOSE (base_list);
9552 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
9553 tree basetype = TREE_VALUE (base_list);
9555 if (access == access_default_node)
9556 access = default_access;
9558 if (TREE_CODE (basetype) == TYPE_DECL)
9559 basetype = TREE_TYPE (basetype);
9560 if (TREE_CODE (basetype) != RECORD_TYPE
9561 && TREE_CODE (basetype) != TYPENAME_TYPE
9562 && TREE_CODE (basetype) != TEMPLATE_TYPE_PARM
9563 && TREE_CODE (basetype) != BOUND_TEMPLATE_TEMPLATE_PARM)
9565 error ("base type %qT fails to be a struct or class type",
9570 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
9571 TYPE_FOR_JAVA (ref) = 1;
9573 base_binfo = NULL_TREE;
9574 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
9576 base_binfo = TYPE_BINFO (basetype);
9577 /* The original basetype could have been a typedef'd type. */
9578 basetype = BINFO_TYPE (base_binfo);
9580 /* Inherit flags from the base. */
9581 TYPE_HAS_NEW_OPERATOR (ref)
9582 |= TYPE_HAS_NEW_OPERATOR (basetype);
9583 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
9584 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
9585 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
9586 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
9587 CLASSTYPE_DIAMOND_SHAPED_P (ref)
9588 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
9589 CLASSTYPE_REPEATED_BASE_P (ref)
9590 |= CLASSTYPE_REPEATED_BASE_P (basetype);
9593 /* We must do this test after we've seen through a typedef
9595 if (TYPE_MARKED_P (basetype))
9597 if (basetype == ref)
9598 error ("recursive type %qT undefined", basetype);
9600 error ("duplicate base type %qT invalid", basetype);
9603 TYPE_MARKED_P (basetype) = 1;
9605 base_binfo = copy_binfo (base_binfo, basetype, ref,
9606 &igo_prev, via_virtual);
9607 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
9608 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
9610 BINFO_BASE_APPEND (binfo, base_binfo);
9611 BINFO_BASE_ACCESS_APPEND (binfo, access);
9614 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
9615 /* If we have space in the vbase vector, we must have shared at
9616 least one of them, and are therefore diamond shaped. */
9617 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
9619 /* Unmark all the types. */
9620 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
9621 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
9622 TYPE_MARKED_P (ref) = 0;
9624 /* Now see if we have a repeated base type. */
9625 if (!CLASSTYPE_REPEATED_BASE_P (ref))
9627 for (base_binfo = binfo; base_binfo;
9628 base_binfo = TREE_CHAIN (base_binfo))
9630 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
9632 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
9635 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
9637 for (base_binfo = binfo; base_binfo;
9638 base_binfo = TREE_CHAIN (base_binfo))
9639 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
9640 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
9647 /* Begin compiling the definition of an enumeration type.
9649 Returns the type object, as yet incomplete.
9650 Also records info about it so that build_enumerator
9651 may be used to declare the individual values as they are read. */
9654 start_enum (tree name)
9658 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
9660 /* If this is the real definition for a previous forward reference,
9661 fill in the contents in the same object that used to be the
9662 forward reference. */
9664 enumtype = lookup_and_check_tag (enum_type, name,
9665 /*tag_scope=*/ts_current,
9666 /*template_header_p=*/false);
9668 if (enumtype != NULL_TREE && TREE_CODE (enumtype) == ENUMERAL_TYPE)
9670 error ("multiple definition of %q#T", enumtype);
9671 error ("%Jprevious definition here", TYPE_MAIN_DECL (enumtype));
9672 /* Clear out TYPE_VALUES, and start again. */
9673 TYPE_VALUES (enumtype) = NULL_TREE;
9677 /* In case of error, make a dummy enum to allow parsing to
9679 if (enumtype == error_mark_node)
9680 name = make_anon_name ();
9682 enumtype = make_node (ENUMERAL_TYPE);
9683 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
9689 /* After processing and defining all the values of an enumeration type,
9690 install their decls in the enumeration type and finish it off.
9691 ENUMTYPE is the type object and VALUES a list of name-value pairs. */
9694 finish_enum (tree enumtype)
9703 bool use_short_enum;
9707 integer_type_kind itk;
9708 tree underlying_type = NULL_TREE;
9710 /* We built up the VALUES in reverse order. */
9711 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
9713 /* For an enum defined in a template, just set the type of the values;
9714 all further processing is postponed until the template is
9715 instantiated. We need to set the type so that tsubst of a CONST_DECL
9717 if (processing_template_decl)
9719 for (values = TYPE_VALUES (enumtype);
9721 values = TREE_CHAIN (values))
9722 TREE_TYPE (TREE_VALUE (values)) = enumtype;
9723 if (at_function_scope_p ())
9724 add_stmt (build_min (TAG_DEFN, enumtype));
9728 /* Determine the minimum and maximum values of the enumerators. */
9729 if (TYPE_VALUES (enumtype))
9731 minnode = maxnode = NULL_TREE;
9733 for (values = TYPE_VALUES (enumtype);
9735 values = TREE_CHAIN (values))
9737 decl = TREE_VALUE (values);
9739 /* [dcl.enum]: Following the closing brace of an enum-specifier,
9740 each enumerator has the type of its enumeration. Prior to the
9741 closing brace, the type of each enumerator is the type of its
9742 initializing value. */
9743 TREE_TYPE (decl) = enumtype;
9745 /* Update the minimum and maximum values, if appropriate. */
9746 value = DECL_INITIAL (decl);
9747 if (value == error_mark_node)
9748 value = integer_zero_node;
9749 /* Figure out what the minimum and maximum values of the
9752 minnode = maxnode = value;
9753 else if (tree_int_cst_lt (maxnode, value))
9755 else if (tree_int_cst_lt (value, minnode))
9762 If the enumerator-list is empty, the underlying type is as if
9763 the enumeration had a single enumerator with value 0. */
9764 minnode = maxnode = integer_zero_node;
9766 /* Compute the number of bits require to represent all values of the
9767 enumeration. We must do this before the type of MINNODE and
9768 MAXNODE are transformed, since min_precision relies on the
9769 TREE_TYPE of the value it is passed. */
9770 unsignedp = tree_int_cst_sgn (minnode) >= 0;
9771 lowprec = min_precision (minnode, unsignedp);
9772 highprec = min_precision (maxnode, unsignedp);
9773 precision = MAX (lowprec, highprec);
9775 /* Determine the underlying type of the enumeration.
9779 The underlying type of an enumeration is an integral type that
9780 can represent all the enumerator values defined in the
9781 enumeration. It is implementation-defined which integral type is
9782 used as the underlying type for an enumeration except that the
9783 underlying type shall not be larger than int unless the value of
9784 an enumerator cannot fit in an int or unsigned int.
9786 We use "int" or an "unsigned int" as the underlying type, even if
9787 a smaller integral type would work, unless the user has
9788 explicitly requested that we use the smallest possible type. The
9789 user can request that for all enumerations with a command line
9790 flag, or for just one enumeration with an attribute. */
9792 use_short_enum = flag_short_enums
9793 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
9795 for (itk = (use_short_enum ? itk_char : itk_int);
9799 underlying_type = integer_types[itk];
9800 if (TYPE_PRECISION (underlying_type) >= precision
9801 && TYPE_UNSIGNED (underlying_type) == unsignedp)
9804 if (itk == itk_none)
9808 IF no integral type can represent all the enumerator values, the
9809 enumeration is ill-formed. */
9810 error ("no integral type can represent all of the enumerator values "
9811 "for %qT", enumtype);
9812 precision = TYPE_PRECISION (long_long_integer_type_node);
9813 underlying_type = integer_types[itk_unsigned_long_long];
9816 /* Compute the minium and maximum values for the type.
9820 For an enumeration where emin is the smallest enumerator and emax
9821 is the largest, the values of the enumeration are the values of the
9822 underlying type in the range bmin to bmax, where bmin and bmax are,
9823 respectively, the smallest and largest values of the smallest bit-
9824 field that can store emin and emax. */
9826 /* The middle-end currently assumes that types with TYPE_PRECISION
9827 narrower than their underlying type are suitably zero or sign
9828 extended to fill their mode. g++ doesn't make these guarantees.
9829 Until the middle-end can represent such paradoxical types, we
9830 set the TYPE_PRECISION to the width of the underlying type. */
9831 TYPE_PRECISION (enumtype) = TYPE_PRECISION (underlying_type);
9833 set_min_and_max_values_for_integral_type (enumtype, precision, unsignedp);
9837 The value of sizeof() applied to an enumeration type, an object
9838 of an enumeration type, or an enumerator, is the value of sizeof()
9839 applied to the underlying type. */
9840 TYPE_SIZE (enumtype) = TYPE_SIZE (underlying_type);
9841 TYPE_SIZE_UNIT (enumtype) = TYPE_SIZE_UNIT (underlying_type);
9842 TYPE_MODE (enumtype) = TYPE_MODE (underlying_type);
9843 TYPE_ALIGN (enumtype) = TYPE_ALIGN (underlying_type);
9844 TYPE_USER_ALIGN (enumtype) = TYPE_USER_ALIGN (underlying_type);
9845 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (underlying_type);
9847 /* Convert each of the enumerators to the type of the underlying
9848 type of the enumeration. */
9849 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
9851 location_t saved_location;
9853 decl = TREE_VALUE (values);
9854 saved_location = input_location;
9855 input_location = DECL_SOURCE_LOCATION (decl);
9856 value = perform_implicit_conversion (underlying_type,
9857 DECL_INITIAL (decl));
9858 input_location = saved_location;
9860 /* Do not clobber shared ints. */
9861 value = copy_node (value);
9863 TREE_TYPE (value) = enumtype;
9864 DECL_INITIAL (decl) = value;
9865 TREE_VALUE (values) = value;
9868 /* Fix up all variant types of this enum type. */
9869 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
9871 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
9872 TYPE_MIN_VALUE (t) = TYPE_MIN_VALUE (enumtype);
9873 TYPE_MAX_VALUE (t) = TYPE_MAX_VALUE (enumtype);
9874 TYPE_SIZE (t) = TYPE_SIZE (enumtype);
9875 TYPE_SIZE_UNIT (t) = TYPE_SIZE_UNIT (enumtype);
9876 TYPE_MODE (t) = TYPE_MODE (enumtype);
9877 TYPE_PRECISION (t) = TYPE_PRECISION (enumtype);
9878 TYPE_ALIGN (t) = TYPE_ALIGN (enumtype);
9879 TYPE_USER_ALIGN (t) = TYPE_USER_ALIGN (enumtype);
9880 TYPE_UNSIGNED (t) = TYPE_UNSIGNED (enumtype);
9883 /* Finish debugging output for this type. */
9884 rest_of_type_compilation (enumtype, namespace_bindings_p ());
9887 /* Build and install a CONST_DECL for an enumeration constant of the
9888 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
9889 Assignment of sequential values by default is handled here. */
9892 build_enumerator (tree name, tree value, tree enumtype)
9898 /* If the VALUE was erroneous, pretend it wasn't there; that will
9899 result in the enum being assigned the next value in sequence. */
9900 if (value == error_mark_node)
9903 /* Remove no-op casts from the value. */
9905 STRIP_TYPE_NOPS (value);
9907 if (! processing_template_decl)
9909 /* Validate and default VALUE. */
9910 if (value != NULL_TREE)
9912 value = integral_constant_value (value);
9914 if (TREE_CODE (value) == INTEGER_CST)
9916 value = perform_integral_promotions (value);
9917 constant_expression_warning (value);
9921 error ("enumerator value for %qD not integer constant", name);
9926 /* Default based on previous value. */
9927 if (value == NULL_TREE)
9929 if (TYPE_VALUES (enumtype))
9932 unsigned HOST_WIDE_INT lo;
9936 /* The next value is the previous value plus one. We can
9937 safely assume that the previous value is an INTEGER_CST.
9938 add_double doesn't know the type of the target expression,
9939 so we must check with int_fits_type_p as well. */
9940 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
9941 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
9942 TREE_INT_CST_HIGH (prev_value),
9944 value = build_int_cst_wide (TREE_TYPE (prev_value), lo, hi);
9945 overflowed |= !int_fits_type_p (value, TREE_TYPE (prev_value));
9949 error ("overflow in enumeration values at %qD", name);
9950 value = error_mark_node;
9954 value = integer_zero_node;
9957 /* Remove no-op casts from the value. */
9958 STRIP_TYPE_NOPS (value);
9961 /* C++ associates enums with global, function, or class declarations. */
9962 context = current_scope ();
9964 /* Build the actual enumeration constant. Note that the enumeration
9965 constants have the type of their initializers until the
9966 enumeration is complete:
9970 Following the closing brace of an enum-specifier, each enumer-
9971 ator has the type of its enumeration. Prior to the closing
9972 brace, the type of each enumerator is the type of its
9975 In finish_enum we will reset the type. Of course, if we're
9976 processing a template, there may be no value. */
9977 type = value ? TREE_TYPE (value) : NULL_TREE;
9979 if (context && context == current_class_type)
9980 /* This enum declaration is local to the class. We need the full
9981 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
9982 decl = build_lang_decl (CONST_DECL, name, type);
9984 /* It's a global enum, or it's local to a function. (Note local to
9985 a function could mean local to a class method. */
9986 decl = build_decl (CONST_DECL, name, type);
9988 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
9989 TREE_CONSTANT (decl) = 1;
9990 TREE_INVARIANT (decl) = 1;
9991 TREE_READONLY (decl) = 1;
9992 DECL_INITIAL (decl) = value;
9994 if (context && context == current_class_type)
9995 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
9996 on the TYPE_FIELDS list for `S'. (That's so that you can say
9997 things like `S::i' later.) */
9998 finish_member_declaration (decl);
10002 /* Add this enumeration constant to the list for this type. */
10003 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
10007 /* We're defining DECL. Make sure that it's type is OK. */
10010 check_function_type (tree decl, tree current_function_parms)
10012 tree fntype = TREE_TYPE (decl);
10013 tree return_type = complete_type (TREE_TYPE (fntype));
10015 /* In a function definition, arg types must be complete. */
10016 require_complete_types_for_parms (current_function_parms);
10018 if (dependent_type_p (return_type))
10020 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
10022 tree args = TYPE_ARG_TYPES (fntype);
10024 error ("return type %q#T is incomplete", return_type);
10026 /* Make it return void instead. */
10027 if (TREE_CODE (fntype) == METHOD_TYPE)
10028 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
10030 TREE_CHAIN (args));
10032 fntype = build_function_type (void_type_node, args);
10034 = build_exception_variant (fntype,
10035 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
10038 abstract_virtuals_error (decl, TREE_TYPE (fntype));
10041 /* Create the FUNCTION_DECL for a function definition.
10042 DECLSPECS and DECLARATOR are the parts of the declaration;
10043 they describe the function's name and the type it returns,
10044 but twisted together in a fashion that parallels the syntax of C.
10046 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
10047 DECLARATOR is really the DECL for the function we are about to
10048 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
10049 indicating that the function is an inline defined in-class.
10051 This function creates a binding context for the function body
10052 as well as setting up the FUNCTION_DECL in current_function_decl.
10054 For C++, we must first check whether that datum makes any sense.
10055 For example, "class A local_a(1,2);" means that variable local_a
10056 is an aggregate of type A, which should have a constructor
10057 applied to it with the argument list [1, 2]. */
10060 start_preparsed_function (tree decl1, tree attrs, int flags)
10062 tree ctype = NULL_TREE;
10065 int doing_friend = 0;
10066 struct cp_binding_level *bl;
10067 tree current_function_parms;
10068 struct c_fileinfo *finfo
10069 = get_fileinfo (lbasename (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1))));
10070 bool honor_interface;
10072 /* Sanity check. */
10073 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
10074 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
10076 fntype = TREE_TYPE (decl1);
10077 if (TREE_CODE (fntype) == METHOD_TYPE)
10078 ctype = TYPE_METHOD_BASETYPE (fntype);
10080 /* ISO C++ 11.4/5. A friend function defined in a class is in
10081 the (lexical) scope of the class in which it is defined. */
10082 if (!ctype && DECL_FRIEND_P (decl1))
10084 ctype = DECL_FRIEND_CONTEXT (decl1);
10086 /* CTYPE could be null here if we're dealing with a template;
10087 for example, `inline friend float foo()' inside a template
10088 will have no CTYPE set. */
10089 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
10095 if (DECL_DECLARED_INLINE_P (decl1)
10096 && lookup_attribute ("noinline", attrs))
10097 warning (0, "inline function %q+D given attribute noinline", decl1);
10099 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
10100 /* This is a constructor, we must ensure that any default args
10101 introduced by this definition are propagated to the clones
10102 now. The clones are used directly in overload resolution. */
10103 adjust_clone_args (decl1);
10105 /* Sometimes we don't notice that a function is a static member, and
10106 build a METHOD_TYPE for it. Fix that up now. */
10107 if (ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
10108 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE)
10110 revert_static_member_fn (decl1);
10114 /* Set up current_class_type, and enter the scope of the class, if
10117 push_nested_class (ctype);
10118 else if (DECL_STATIC_FUNCTION_P (decl1))
10119 push_nested_class (DECL_CONTEXT (decl1));
10121 /* Now that we have entered the scope of the class, we must restore
10122 the bindings for any template parameters surrounding DECL1, if it
10123 is an inline member template. (Order is important; consider the
10124 case where a template parameter has the same name as a field of
10125 the class.) It is not until after this point that
10126 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
10127 if (flags & SF_INCLASS_INLINE)
10128 maybe_begin_member_template_processing (decl1);
10130 /* Effective C++ rule 15. */
10132 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
10133 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
10134 warning (0, "%<operator=%> should return a reference to %<*this%>");
10136 /* Make the init_value nonzero so pushdecl knows this is not tentative.
10137 error_mark_node is replaced below (in poplevel) with the BLOCK. */
10138 if (!DECL_INITIAL (decl1))
10139 DECL_INITIAL (decl1) = error_mark_node;
10141 /* This function exists in static storage.
10142 (This does not mean `static' in the C sense!) */
10143 TREE_STATIC (decl1) = 1;
10145 /* We must call push_template_decl after current_class_type is set
10146 up. (If we are processing inline definitions after exiting a
10147 class scope, current_class_type will be NULL_TREE until set above
10148 by push_nested_class.) */
10149 if (processing_template_decl)
10151 /* FIXME: Handle error_mark_node more gracefully. */
10152 tree newdecl1 = push_template_decl (decl1);
10153 if (newdecl1 != error_mark_node)
10157 /* We are now in the scope of the function being defined. */
10158 current_function_decl = decl1;
10160 /* Save the parm names or decls from this function's declarator
10161 where store_parm_decls will find them. */
10162 current_function_parms = DECL_ARGUMENTS (decl1);
10164 /* Make sure the parameter and return types are reasonable. When
10165 you declare a function, these types can be incomplete, but they
10166 must be complete when you define the function. */
10167 check_function_type (decl1, current_function_parms);
10169 /* Build the return declaration for the function. */
10170 restype = TREE_TYPE (fntype);
10171 /* Promote the value to int before returning it. */
10172 if (c_promoting_integer_type_p (restype))
10173 restype = type_promotes_to (restype);
10174 if (DECL_RESULT (decl1) == NULL_TREE)
10178 resdecl = build_decl (RESULT_DECL, 0, TYPE_MAIN_VARIANT (restype));
10179 DECL_ARTIFICIAL (resdecl) = 1;
10180 DECL_IGNORED_P (resdecl) = 1;
10181 DECL_RESULT (decl1) = resdecl;
10183 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
10186 /* Initialize RTL machinery. We cannot do this until
10187 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
10188 even when processing a template; this is how we get
10189 CFUN set up, and our per-function variables initialized.
10190 FIXME factor out the non-RTL stuff. */
10191 bl = current_binding_level;
10192 allocate_struct_function (decl1);
10193 current_binding_level = bl;
10195 /* Even though we're inside a function body, we still don't want to
10196 call expand_expr to calculate the size of a variable-sized array.
10197 We haven't necessarily assigned RTL to all variables yet, so it's
10198 not safe to try to expand expressions involving them. */
10199 cfun->x_dont_save_pending_sizes_p = 1;
10201 /* Start the statement-tree, start the tree now. */
10202 DECL_SAVED_TREE (decl1) = push_stmt_list ();
10204 /* Let the user know we're compiling this function. */
10205 announce_function (decl1);
10207 /* Record the decl so that the function name is defined.
10208 If we already have a decl for this name, and it is a FUNCTION_DECL,
10209 use the old decl. */
10210 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
10212 /* A specialization is not used to guide overload resolution. */
10213 if (!DECL_FUNCTION_MEMBER_P (decl1)
10214 && !(DECL_USE_TEMPLATE (decl1) &&
10215 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
10217 tree olddecl = pushdecl (decl1);
10219 if (olddecl == error_mark_node)
10220 /* If something went wrong when registering the declaration,
10221 use DECL1; we have to have a FUNCTION_DECL to use when
10222 parsing the body of the function. */
10225 /* Otherwise, OLDDECL is either a previous declaration of
10226 the same function or DECL1 itself. */
10231 /* We need to set the DECL_CONTEXT. */
10232 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
10233 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
10234 /* And make sure we have enough default args. */
10235 check_default_args (decl1);
10237 fntype = TREE_TYPE (decl1);
10240 /* Determine the ELF visibility attribute for the function. We must
10241 not do this before calling "pushdecl", as we must allow
10242 "duplicate_decls" to merge any attributes appropriately. */
10243 if (!DECL_CLONED_FUNCTION_P (decl1))
10244 determine_visibility (decl1);
10246 /* Reset these in case the call to pushdecl changed them. */
10247 current_function_decl = decl1;
10248 cfun->decl = decl1;
10250 /* If we are (erroneously) defining a function that we have already
10251 defined before, wipe out what we knew before. */
10252 if (!DECL_PENDING_INLINE_P (decl1))
10253 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
10255 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
10257 /* We know that this was set up by `grokclassfn'. We do not
10258 wait until `store_parm_decls', since evil parse errors may
10259 never get us to that point. Here we keep the consistency
10260 between `current_class_type' and `current_class_ptr'. */
10261 tree t = DECL_ARGUMENTS (decl1);
10263 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
10264 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
10266 cp_function_chain->x_current_class_ref
10267 = build_indirect_ref (t, NULL);
10268 cp_function_chain->x_current_class_ptr = t;
10270 /* Constructors and destructors need to know whether they're "in
10271 charge" of initializing virtual base classes. */
10272 t = TREE_CHAIN (t);
10273 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
10275 current_in_charge_parm = t;
10276 t = TREE_CHAIN (t);
10278 if (DECL_HAS_VTT_PARM_P (decl1))
10280 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
10281 current_vtt_parm = t;
10285 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
10286 /* Implicitly-defined methods (like the
10287 destructor for a class in which no destructor
10288 is explicitly declared) must not be defined
10289 until their definition is needed. So, we
10290 ignore interface specifications for
10291 compiler-generated functions. */
10292 && !DECL_ARTIFICIAL (decl1));
10294 if (DECL_INTERFACE_KNOWN (decl1))
10296 tree ctx = decl_function_context (decl1);
10298 if (DECL_NOT_REALLY_EXTERN (decl1))
10299 DECL_EXTERNAL (decl1) = 0;
10301 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
10302 && TREE_PUBLIC (ctx))
10303 /* This is a function in a local class in an extern inline
10305 comdat_linkage (decl1);
10307 /* If this function belongs to an interface, it is public.
10308 If it belongs to someone else's interface, it is also external.
10309 This only affects inlines and template instantiations. */
10310 else if (!finfo->interface_unknown && honor_interface)
10312 if (DECL_DECLARED_INLINE_P (decl1)
10313 || DECL_TEMPLATE_INSTANTIATION (decl1)
10314 || processing_template_decl)
10316 DECL_EXTERNAL (decl1)
10317 = (finfo->interface_only
10318 || (DECL_DECLARED_INLINE_P (decl1)
10319 && ! flag_implement_inlines
10320 && !DECL_VINDEX (decl1)));
10322 /* For WIN32 we also want to put these in linkonce sections. */
10323 maybe_make_one_only (decl1);
10326 DECL_EXTERNAL (decl1) = 0;
10327 DECL_INTERFACE_KNOWN (decl1) = 1;
10328 /* If this function is in an interface implemented in this file,
10329 make sure that the backend knows to emit this function
10331 if (!DECL_EXTERNAL (decl1))
10332 mark_needed (decl1);
10334 else if (finfo->interface_unknown && finfo->interface_only
10335 && honor_interface)
10337 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
10338 interface, we will have both finfo->interface_unknown and
10339 finfo->interface_only set. In that case, we don't want to
10340 use the normal heuristics because someone will supply a
10341 #pragma implementation elsewhere, and deducing it here would
10342 produce a conflict. */
10343 comdat_linkage (decl1);
10344 DECL_EXTERNAL (decl1) = 0;
10345 DECL_INTERFACE_KNOWN (decl1) = 1;
10346 DECL_DEFER_OUTPUT (decl1) = 1;
10350 /* This is a definition, not a reference.
10351 So clear DECL_EXTERNAL. */
10352 DECL_EXTERNAL (decl1) = 0;
10354 if ((DECL_DECLARED_INLINE_P (decl1)
10355 || DECL_TEMPLATE_INSTANTIATION (decl1))
10356 && ! DECL_INTERFACE_KNOWN (decl1)
10357 /* Don't try to defer nested functions for now. */
10358 && ! decl_function_context (decl1))
10359 DECL_DEFER_OUTPUT (decl1) = 1;
10361 DECL_INTERFACE_KNOWN (decl1) = 1;
10364 begin_scope (sk_function_parms, decl1);
10368 if (DECL_DESTRUCTOR_P (decl1)
10369 || (DECL_CONSTRUCTOR_P (decl1)
10370 && targetm.cxx.cdtor_returns_this ()))
10372 cdtor_label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
10373 DECL_CONTEXT (cdtor_label) = current_function_decl;
10376 start_fname_decls ();
10378 store_parm_decls (current_function_parms);
10382 /* Like start_preparsed_function, except that instead of a
10383 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
10385 Returns 1 on success. If the DECLARATOR is not suitable for a function
10386 (it defines a datum instead), we return 0, which tells
10387 yyparse to report a parse error. */
10390 start_function (cp_decl_specifier_seq *declspecs,
10391 const cp_declarator *declarator,
10396 if (have_extern_spec)
10398 declspecs->storage_class = sc_extern;
10399 /* This should only be done once on the outermost decl. */
10400 have_extern_spec = false;
10403 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
10404 /* If the declarator is not suitable for a function definition,
10405 cause a syntax error. */
10406 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
10409 /* If #pragma weak was used, mark the decl weak now. */
10410 if (global_scope_p (current_binding_level))
10411 maybe_apply_pragma_weak (decl1);
10413 if (DECL_MAIN_P (decl1))
10414 /* main must return int. grokfndecl should have corrected it
10415 (and issued a diagnostic) if the user got it wrong. */
10416 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
10417 integer_type_node));
10419 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
10424 /* Store the parameter declarations into the current function declaration.
10425 This is called after parsing the parameter declarations, before
10426 digesting the body of the function.
10428 Also install to binding contour return value identifier, if any. */
10431 store_parm_decls (tree current_function_parms)
10433 tree fndecl = current_function_decl;
10436 /* This is a chain of any other decls that came in among the parm
10437 declarations. If a parm is declared with enum {foo, bar} x;
10438 then CONST_DECLs for foo and bar are put here. */
10439 tree nonparms = NULL_TREE;
10441 if (current_function_parms)
10443 /* This case is when the function was defined with an ANSI prototype.
10444 The parms already have decls, so we need not do anything here
10445 except record them as in effect
10446 and complain if any redundant old-style parm decls were written. */
10448 tree specparms = current_function_parms;
10451 /* Must clear this because it might contain TYPE_DECLs declared
10453 current_binding_level->names = NULL;
10455 /* If we're doing semantic analysis, then we'll call pushdecl
10456 for each of these. We must do them in reverse order so that
10457 they end in the correct forward order. */
10458 specparms = nreverse (specparms);
10460 for (parm = specparms; parm; parm = next)
10462 next = TREE_CHAIN (parm);
10463 if (TREE_CODE (parm) == PARM_DECL)
10465 if (DECL_NAME (parm) == NULL_TREE
10466 || TREE_CODE (parm) != VOID_TYPE)
10469 error ("parameter %qD declared void", parm);
10473 /* If we find an enum constant or a type tag,
10474 put it aside for the moment. */
10475 TREE_CHAIN (parm) = NULL_TREE;
10476 nonparms = chainon (nonparms, parm);
10480 /* Get the decls in their original chain order and record in the
10481 function. This is all and only the PARM_DECLs that were
10482 pushed into scope by the loop above. */
10483 DECL_ARGUMENTS (fndecl) = getdecls ();
10486 DECL_ARGUMENTS (fndecl) = NULL_TREE;
10488 /* Now store the final chain of decls for the arguments
10489 as the decl-chain of the current lexical scope.
10490 Put the enumerators in as well, at the front so that
10491 DECL_ARGUMENTS is not modified. */
10492 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
10494 /* For a cloned function, we've already got all the code we need;
10495 there's no need to add any extra bits. */
10496 if (!DECL_CLONED_FUNCTION_P (fndecl))
10498 /* Do the starting of the exception specifications, if we have any. */
10499 if (flag_exceptions && !processing_template_decl
10500 && flag_enforce_eh_specs
10501 && TYPE_RAISES_EXCEPTIONS (TREE_TYPE (current_function_decl)))
10502 current_eh_spec_block = begin_eh_spec_block ();
10507 /* We have finished doing semantic analysis on DECL, but have not yet
10508 generated RTL for its body. Save away our current state, so that
10509 when we want to generate RTL later we know what to do. */
10512 save_function_data (tree decl)
10514 struct language_function *f;
10516 /* Save the language-specific per-function data so that we can
10517 get it back when we really expand this function. */
10518 gcc_assert (!DECL_PENDING_INLINE_P (decl));
10521 f = GGC_NEW (struct language_function);
10522 memcpy (f, cp_function_chain, sizeof (struct language_function));
10523 DECL_SAVED_FUNCTION_DATA (decl) = f;
10525 /* Clear out the bits we don't need. */
10526 f->base.x_stmt_tree.x_cur_stmt_list = NULL_TREE;
10527 f->x_named_label_uses = NULL;
10528 f->bindings = NULL;
10529 f->x_local_names = NULL;
10533 /* Set the return value of the constructor (if present). */
10536 finish_constructor_body (void)
10541 if (targetm.cxx.cdtor_returns_this ())
10543 /* Any return from a constructor will end up here. */
10544 add_stmt (build_stmt (LABEL_EXPR, cdtor_label));
10546 val = DECL_ARGUMENTS (current_function_decl);
10547 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
10548 DECL_RESULT (current_function_decl), val);
10549 /* Return the address of the object. */
10550 exprstmt = build_stmt (RETURN_EXPR, val);
10551 add_stmt (exprstmt);
10555 /* Do all the processing for the beginning of a destructor; set up the
10556 vtable pointers and cleanups for bases and members. */
10559 begin_destructor_body (void)
10562 tree compound_stmt;
10564 /* If the dtor is empty, and we know there is not any possible
10565 way we could use any vtable entries, before they are possibly
10566 set by a base class dtor, we don't have to setup the vtables,
10567 as we know that any base class dtor will set up any vtables
10568 it needs. We avoid MI, because one base class dtor can do a
10569 virtual dispatch to an overridden function that would need to
10570 have a non-related vtable set up, we cannot avoid setting up
10571 vtables in that case. We could change this to see if there
10572 is just one vtable.
10574 ??? In the destructor for a class, the vtables are set
10575 appropriately for that class. There will be no non-related
10576 vtables. jason 2001-12-11. */
10577 if_stmt = begin_if_stmt ();
10579 /* If it is not safe to avoid setting up the vtables, then
10580 someone will change the condition to be boolean_true_node.
10581 (Actually, for now, we do not have code to set the condition
10582 appropriately, so we just assume that we always need to
10583 initialize the vtables.) */
10584 finish_if_stmt_cond (boolean_true_node, if_stmt);
10586 compound_stmt = begin_compound_stmt (0);
10588 /* Make all virtual function table pointers in non-virtual base
10589 classes point to CURRENT_CLASS_TYPE's virtual function
10591 initialize_vtbl_ptrs (current_class_ptr);
10593 finish_compound_stmt (compound_stmt);
10594 finish_then_clause (if_stmt);
10595 finish_if_stmt (if_stmt);
10597 /* And insert cleanups for our bases and members so that they
10598 will be properly destroyed if we throw. */
10599 push_base_cleanups ();
10602 /* At the end of every destructor we generate code to delete the object if
10603 necessary. Do that now. */
10606 finish_destructor_body (void)
10610 /* Any return from a destructor will end up here; that way all base
10611 and member cleanups will be run when the function returns. */
10612 add_stmt (build_stmt (LABEL_EXPR, cdtor_label));
10614 /* In a virtual destructor, we must call delete. */
10615 if (DECL_VIRTUAL_P (current_function_decl))
10618 tree virtual_size = cxx_sizeof (current_class_type);
10622 At the point of definition of a virtual destructor (including
10623 an implicit definition), non-placement operator delete shall
10624 be looked up in the scope of the destructor's class and if
10625 found shall be accessible and unambiguous. */
10626 exprstmt = build_op_delete_call
10627 (DELETE_EXPR, current_class_ptr, virtual_size,
10628 /*global_p=*/false, NULL_TREE);
10630 if_stmt = begin_if_stmt ();
10631 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
10632 current_in_charge_parm,
10635 finish_expr_stmt (exprstmt);
10636 finish_then_clause (if_stmt);
10637 finish_if_stmt (if_stmt);
10640 if (targetm.cxx.cdtor_returns_this ())
10644 val = DECL_ARGUMENTS (current_function_decl);
10645 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
10646 DECL_RESULT (current_function_decl), val);
10647 /* Return the address of the object. */
10648 exprstmt = build_stmt (RETURN_EXPR, val);
10649 add_stmt (exprstmt);
10653 /* Do the necessary processing for the beginning of a function body, which
10654 in this case includes member-initializers, but not the catch clauses of
10655 a function-try-block. Currently, this means opening a binding level
10656 for the member-initializers (in a ctor) and member cleanups (in a dtor). */
10659 begin_function_body (void)
10663 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
10666 if (processing_template_decl)
10667 /* Do nothing now. */;
10669 /* Always keep the BLOCK node associated with the outermost pair of
10670 curly braces of a function. These are needed for correct
10671 operation of dwarfout.c. */
10672 keep_next_level (true);
10674 stmt = begin_compound_stmt (BCS_FN_BODY);
10676 if (processing_template_decl)
10677 /* Do nothing now. */;
10678 else if (DECL_DESTRUCTOR_P (current_function_decl))
10679 begin_destructor_body ();
10684 /* Do the processing for the end of a function body. Currently, this means
10685 closing out the cleanups for fully-constructed bases and members, and in
10686 the case of the destructor, deleting the object if desired. Again, this
10687 is only meaningful for [cd]tors, since they are the only functions where
10688 there is a significant distinction between the main body and any
10689 function catch clauses. Handling, say, main() return semantics here
10690 would be wrong, as flowing off the end of a function catch clause for
10691 main() would also need to return 0. */
10694 finish_function_body (tree compstmt)
10696 if (compstmt == NULL_TREE)
10699 /* Close the block. */
10700 finish_compound_stmt (compstmt);
10702 if (processing_template_decl)
10703 /* Do nothing now. */;
10704 else if (DECL_CONSTRUCTOR_P (current_function_decl))
10705 finish_constructor_body ();
10706 else if (DECL_DESTRUCTOR_P (current_function_decl))
10707 finish_destructor_body ();
10710 /* Given a function, returns the BLOCK corresponding to the outermost level
10711 of curly braces, skipping the artificial block created for constructor
10715 outer_curly_brace_block (tree fndecl)
10717 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
10718 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
10719 /* Skip the artificial function body block. */
10720 block = BLOCK_SUBBLOCKS (block);
10724 /* Finish up a function declaration and compile that function
10725 all the way to assembler language output. The free the storage
10726 for the function definition.
10728 FLAGS is a bitwise or of the following values:
10730 We just finished processing the body of an in-class inline
10731 function definition. (This processing will have taken place
10732 after the class definition is complete.) */
10735 finish_function (int flags)
10737 tree fndecl = current_function_decl;
10738 tree fntype, ctype = NULL_TREE;
10739 int inclass_inline = (flags & 2) != 0;
10742 /* When we get some parse errors, we can end up without a
10743 current_function_decl, so cope. */
10744 if (fndecl == NULL_TREE)
10745 return error_mark_node;
10747 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
10748 && DECL_VIRTUAL_P (fndecl)
10749 && !processing_template_decl)
10751 tree fnclass = DECL_CONTEXT (fndecl);
10752 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
10753 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
10756 nested = function_depth > 1;
10757 fntype = TREE_TYPE (fndecl);
10759 /* TREE_READONLY (fndecl) = 1;
10760 This caused &foo to be of type ptr-to-const-function
10761 which then got a warning when stored in a ptr-to-function variable. */
10763 gcc_assert (building_stmt_tree ());
10765 /* For a cloned function, we've already got all the code we need;
10766 there's no need to add any extra bits. */
10767 if (!DECL_CLONED_FUNCTION_P (fndecl))
10769 if (DECL_MAIN_P (current_function_decl))
10773 /* Make it so that `main' always returns 0 by default (or
10776 stmt = finish_return_stmt (integer_one_node);
10778 stmt = finish_return_stmt (integer_zero_node);
10780 /* Hack. We don't want the middle-end to warn that this
10781 return is unreachable, so put the statement on the
10783 #ifdef USE_MAPPED_LOCATION
10784 SET_EXPR_LOCATION (stmt, UNKNOWN_LOCATION);
10786 annotate_with_file_line (stmt, input_filename, 0);
10790 /* Finish dealing with exception specifiers. */
10791 if (flag_exceptions && !processing_template_decl
10792 && flag_enforce_eh_specs
10793 && TYPE_RAISES_EXCEPTIONS (TREE_TYPE (current_function_decl)))
10794 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
10795 (TREE_TYPE (current_function_decl)),
10796 current_eh_spec_block);
10799 /* If we're saving up tree structure, tie off the function now. */
10800 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
10802 finish_fname_decls ();
10804 /* If this function can't throw any exceptions, remember that. */
10805 if (!processing_template_decl
10806 && !cp_function_chain->can_throw
10807 && !flag_non_call_exceptions)
10808 TREE_NOTHROW (fndecl) = 1;
10810 /* This must come after expand_function_end because cleanups might
10811 have declarations (from inline functions) that need to go into
10812 this function's blocks. */
10814 /* If the current binding level isn't the outermost binding level
10815 for this function, either there is a bug, or we have experienced
10816 syntax errors and the statement tree is malformed. */
10817 if (current_binding_level->kind != sk_function_parms)
10819 /* Make sure we have already experienced errors. */
10820 gcc_assert (errorcount);
10822 /* Throw away the broken statement tree and extra binding
10824 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
10826 while (current_binding_level->kind != sk_function_parms)
10828 if (current_binding_level->kind == sk_class)
10829 pop_nested_class ();
10831 poplevel (0, 0, 0);
10834 poplevel (1, 0, 1);
10836 /* Statements should always be full-expressions at the outermost set
10837 of curly braces for a function. */
10838 gcc_assert (stmts_are_full_exprs_p ());
10840 /* Set up the named return value optimization, if we can. Candidate
10841 variables are selected in check_return_value. */
10842 if (current_function_return_value)
10844 tree r = current_function_return_value;
10847 if (r != error_mark_node
10848 /* This is only worth doing for fns that return in memory--and
10849 simpler, since we don't have to worry about promoted modes. */
10850 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
10851 /* Only allow this for variables declared in the outer scope of
10852 the function so we know that their lifetime always ends with a
10853 return; see g++.dg/opt/nrv6.C. We could be more flexible if
10854 we were to do this optimization in tree-ssa. */
10855 && (outer = outer_curly_brace_block (fndecl))
10856 && chain_member (r, BLOCK_VARS (outer)))
10857 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
10859 current_function_return_value = NULL_TREE;
10862 /* Remember that we were in class scope. */
10863 if (current_class_name)
10864 ctype = current_class_type;
10866 /* Must mark the RESULT_DECL as being in this function. */
10867 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
10869 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
10870 to the FUNCTION_DECL node itself. */
10871 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
10873 /* Save away current state, if appropriate. */
10874 if (!processing_template_decl)
10875 save_function_data (fndecl);
10877 /* Complain if there's just no return statement. */
10878 if (warn_return_type
10879 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
10880 && !dependent_type_p (TREE_TYPE (fntype))
10881 && !current_function_returns_value && !current_function_returns_null
10882 /* Don't complain if we abort or throw. */
10883 && !current_function_returns_abnormally
10884 && !DECL_NAME (DECL_RESULT (fndecl))
10885 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
10886 inline function, as we might never be compiled separately. */
10887 && (DECL_INLINE (fndecl) || processing_template_decl)
10888 /* Structor return values (if any) are set by the compiler. */
10889 && !DECL_CONSTRUCTOR_P (fndecl)
10890 && !DECL_DESTRUCTOR_P (fndecl))
10891 warning (0, "no return statement in function returning non-void");
10893 /* Store the end of the function, so that we get good line number
10894 info for the epilogue. */
10895 cfun->function_end_locus = input_location;
10897 /* Genericize before inlining. */
10898 if (!processing_template_decl)
10900 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
10901 cp_genericize (fndecl);
10902 /* Clear out the bits we don't need. */
10903 f->x_current_class_ptr = NULL;
10904 f->x_current_class_ref = NULL;
10905 f->x_eh_spec_block = NULL;
10906 f->x_in_charge_parm = NULL;
10907 f->x_vtt_parm = NULL;
10908 f->x_return_value = NULL;
10909 f->bindings = NULL;
10911 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
10912 c_warn_unused_result (&DECL_SAVED_TREE (fndecl));
10914 /* Clear out the bits we don't need. */
10915 local_names = NULL;
10916 named_label_uses = NULL;
10918 /* We're leaving the context of this function, so zap cfun. It's still in
10919 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
10921 current_function_decl = NULL;
10923 /* If this is an in-class inline definition, we may have to pop the
10924 bindings for the template parameters that we added in
10925 maybe_begin_member_template_processing when start_function was
10927 if (inclass_inline)
10928 maybe_end_member_template_processing ();
10930 /* Leave the scope of the class. */
10932 pop_nested_class ();
10938 /* Let the error reporting routines know that we're outside a
10939 function. For a nested function, this value is used in
10940 cxx_pop_function_context and then reset via pop_function_context. */
10941 current_function_decl = NULL_TREE;
10946 /* Create the FUNCTION_DECL for a function definition.
10947 DECLSPECS and DECLARATOR are the parts of the declaration;
10948 they describe the return type and the name of the function,
10949 but twisted together in a fashion that parallels the syntax of C.
10951 This function creates a binding context for the function body
10952 as well as setting up the FUNCTION_DECL in current_function_decl.
10954 Returns a FUNCTION_DECL on success.
10956 If the DECLARATOR is not suitable for a function (it defines a datum
10957 instead), we return 0, which tells yyparse to report a parse error.
10959 May return void_type_node indicating that this method is actually
10960 a friend. See grokfield for more details.
10962 Came here with a `.pushlevel' .
10964 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
10965 CHANGES TO CODE IN `grokfield'. */
10968 start_method (cp_decl_specifier_seq *declspecs,
10969 const cp_declarator *declarator, tree attrlist)
10971 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
10974 if (fndecl == error_mark_node)
10975 return error_mark_node;
10977 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
10979 error ("invalid member function declaration");
10980 return error_mark_node;
10984 cplus_decl_attributes (&fndecl, attrlist, 0);
10986 /* Pass friends other than inline friend functions back. */
10987 if (fndecl == void_type_node)
10990 if (DECL_IN_AGGR_P (fndecl))
10992 if (DECL_CONTEXT (fndecl)
10993 && TREE_CODE( DECL_CONTEXT (fndecl)) != NAMESPACE_DECL)
10994 error ("%qD is already defined in class %qT", fndecl,
10995 DECL_CONTEXT (fndecl));
10996 return error_mark_node;
10999 check_template_shadow (fndecl);
11001 DECL_DECLARED_INLINE_P (fndecl) = 1;
11002 if (flag_default_inline)
11003 DECL_INLINE (fndecl) = 1;
11005 /* We process method specializations in finish_struct_1. */
11006 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
11008 fndecl = push_template_decl (fndecl);
11009 if (fndecl == error_mark_node)
11013 if (! DECL_FRIEND_P (fndecl))
11015 if (TREE_CHAIN (fndecl))
11017 fndecl = copy_node (fndecl);
11018 TREE_CHAIN (fndecl) = NULL_TREE;
11020 grok_special_member_properties (fndecl);
11023 cp_finish_decl (fndecl, NULL_TREE, NULL_TREE, 0);
11025 /* Make a place for the parms. */
11026 begin_scope (sk_function_parms, fndecl);
11028 DECL_IN_AGGR_P (fndecl) = 1;
11032 /* Go through the motions of finishing a function definition.
11033 We don't compile this method until after the whole class has
11036 FINISH_METHOD must return something that looks as though it
11037 came from GROKFIELD (since we are defining a method, after all).
11039 This is called after parsing the body of the function definition.
11040 STMTS is the chain of statements that makes up the function body.
11042 DECL is the ..._DECL that `start_method' provided. */
11045 finish_method (tree decl)
11047 tree fndecl = decl;
11052 if (decl == void_type_node)
11055 old_initial = DECL_INITIAL (fndecl);
11057 /* Undo the level for the parms (from start_method).
11058 This is like poplevel, but it causes nothing to be
11059 saved. Saving information here confuses symbol-table
11060 output routines. Besides, this information will
11061 be correctly output when this method is actually
11064 /* Clear out the meanings of the local variables of this level;
11065 also record in each decl which block it belongs to. */
11067 for (link = current_binding_level->names; link; link = TREE_CHAIN (link))
11069 if (DECL_NAME (link) != NULL_TREE)
11070 pop_binding (DECL_NAME (link), link);
11071 gcc_assert (TREE_CODE (link) != FUNCTION_DECL);
11072 DECL_CONTEXT (link) = NULL_TREE;
11075 poplevel (0, 0, 0);
11077 DECL_INITIAL (fndecl) = old_initial;
11079 /* We used to check if the context of FNDECL was different from
11080 current_class_type as another way to get inside here. This didn't work
11081 for String.cc in libg++. */
11082 if (DECL_FRIEND_P (fndecl))
11084 VEC_safe_push (tree, gc, CLASSTYPE_INLINE_FRIENDS (current_class_type),
11086 decl = void_type_node;
11093 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
11094 we can lay it out later, when and if its type becomes complete. */
11097 maybe_register_incomplete_var (tree var)
11099 gcc_assert (TREE_CODE (var) == VAR_DECL);
11101 /* Keep track of variables with incomplete types. */
11102 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
11103 && DECL_EXTERNAL (var))
11105 tree inner_type = TREE_TYPE (var);
11107 while (TREE_CODE (inner_type) == ARRAY_TYPE)
11108 inner_type = TREE_TYPE (inner_type);
11109 inner_type = TYPE_MAIN_VARIANT (inner_type);
11111 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
11112 /* RTTI TD entries are created while defining the type_info. */
11113 || (TYPE_LANG_SPECIFIC (inner_type)
11114 && TYPE_BEING_DEFINED (inner_type)))
11115 incomplete_vars = tree_cons (inner_type, var, incomplete_vars);
11119 /* Called when a class type (given by TYPE) is defined. If there are
11120 any existing VAR_DECLs whose type hsa been completed by this
11121 declaration, update them now. */
11124 complete_vars (tree type)
11126 tree *list = &incomplete_vars;
11128 gcc_assert (CLASS_TYPE_P (type));
11131 if (same_type_p (type, TREE_PURPOSE (*list)))
11133 tree var = TREE_VALUE (*list);
11134 tree type = TREE_TYPE (var);
11135 /* Complete the type of the variable. The VAR_DECL itself
11136 will be laid out in expand_expr. */
11137 complete_type (type);
11138 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
11139 /* Remove this entry from the list. */
11140 *list = TREE_CHAIN (*list);
11143 list = &TREE_CHAIN (*list);
11146 /* Check for pending declarations which may have abstract type. */
11147 complete_type_check_abstract (type);
11150 /* If DECL is of a type which needs a cleanup, build that cleanup
11154 cxx_maybe_build_cleanup (tree decl)
11156 tree type = TREE_TYPE (decl);
11158 if (type != error_mark_node && TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
11160 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
11162 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
11163 && CLASSTYPE_VBASECLASSES (type));
11165 if (TREE_CODE (type) == ARRAY_TYPE)
11169 cxx_mark_addressable (decl);
11170 rval = build_unary_op (ADDR_EXPR, decl, 0);
11173 /* Optimize for space over speed here. */
11174 if (!has_vbases || flag_expensive_optimizations)
11175 flags |= LOOKUP_NONVIRTUAL;
11177 rval = build_delete (TREE_TYPE (rval), rval,
11178 sfk_complete_destructor, flags, 0);
11185 /* When a stmt has been parsed, this function is called. */
11192 /* DECL was originally constructed as a non-static member function,
11193 but turned out to be static. Update it accordingly. */
11196 revert_static_member_fn (tree decl)
11199 tree function = TREE_TYPE (decl);
11200 tree args = TYPE_ARG_TYPES (function);
11202 if (cp_type_quals (TREE_TYPE (TREE_VALUE (args)))
11203 != TYPE_UNQUALIFIED)
11204 error ("static member function %q#D declared with type qualifiers", decl);
11206 args = TREE_CHAIN (args);
11207 tmp = build_function_type (TREE_TYPE (function), args);
11208 tmp = build_qualified_type (tmp, cp_type_quals (function));
11209 tmp = build_exception_variant (tmp,
11210 TYPE_RAISES_EXCEPTIONS (function));
11211 TREE_TYPE (decl) = tmp;
11212 if (DECL_ARGUMENTS (decl))
11213 DECL_ARGUMENTS (decl) = TREE_CHAIN (DECL_ARGUMENTS (decl));
11214 DECL_STATIC_FUNCTION_P (decl) = 1;
11217 /* Initialize the variables used during compilation of a C++
11221 cxx_push_function_context (struct function * f)
11223 struct language_function *p = GGC_CNEW (struct language_function);
11226 /* Whenever we start a new function, we destroy temporaries in the
11228 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
11234 if (DECL_SAVED_FUNCTION_DATA (fn))
11236 /* If we already parsed this function, and we're just expanding it
11237 now, restore saved state. */
11238 *cp_function_chain = *DECL_SAVED_FUNCTION_DATA (fn);
11240 /* We don't need the saved data anymore. Unless this is an inline
11241 function; we need the named return value info for
11242 declare_return_variable. */
11243 if (! DECL_INLINE (fn))
11244 DECL_SAVED_FUNCTION_DATA (fn) = NULL;
11249 /* Free the language-specific parts of F, now that we've finished
11250 compiling the function. */
11253 cxx_pop_function_context (struct function * f)
11258 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
11259 one of the language-independent trees. */
11261 enum cp_tree_node_structure_enum
11262 cp_tree_node_structure (union lang_tree_node * t)
11264 switch (TREE_CODE (&t->generic))
11266 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
11267 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
11268 case OVERLOAD: return TS_CP_OVERLOAD;
11269 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
11270 case TINST_LEVEL: return TS_CP_TINST_LEVEL;
11271 case PTRMEM_CST: return TS_CP_PTRMEM;
11272 case BASELINK: return TS_CP_BASELINK;
11273 default: return TS_CP_GENERIC;
11277 /* Build the void_list_node (void_type_node having been created). */
11279 build_void_list_node (void)
11281 tree t = build_tree_list (NULL_TREE, void_type_node);
11286 cp_missing_noreturn_ok_p (tree decl)
11288 /* A missing noreturn is ok for the `main' function. */
11289 return DECL_MAIN_P (decl);
11292 /* Return the COMDAT group into which DECL should be placed. */
11295 cxx_comdat_group (tree decl)
11299 /* Virtual tables, construction virtual tables, and virtual table
11300 tables all go in a single COMDAT group, named after the primary
11302 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
11303 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
11304 /* For all other DECLs, the COMDAT group is the mangled name of the
11305 declaration itself. */
11308 while (DECL_THUNK_P (decl))
11310 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
11311 into the same section as the target function. In that case
11312 we must return target's name. */
11313 tree target = THUNK_TARGET (decl);
11314 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
11315 && DECL_SECTION_NAME (target) != NULL
11316 && DECL_ONE_ONLY (target))
11321 name = DECL_ASSEMBLER_NAME (decl);
11324 return IDENTIFIER_POINTER (name);
11327 #include "gt-cp-decl.h"