1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002, 2003, 2004, 2005, 2006 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);
118 /* Erroneous argument lists can use this *IFF* they do not modify it. */
119 tree error_mark_list;
121 /* The following symbols are subsumed in the cp_global_trees array, and
122 listed here individually for documentation purposes.
125 tree wchar_decl_node;
127 tree vtable_entry_type;
128 tree delta_type_node;
129 tree __t_desc_type_node;
131 tree class_type_node;
132 tree unknown_type_node;
134 Array type `vtable_entry_type[]'
137 tree vtbl_ptr_type_node;
144 A FUNCTION_DECL which can call `abort'. Not necessarily the
145 one that the user will declare, but sufficient to be called
146 by routines that want to abort the program.
150 The FUNCTION_DECL for the default `::operator delete'.
152 tree global_delete_fndecl;
155 tree type_info_type_node, tinfo_decl_id, tinfo_decl_type;
160 tree cp_global_trees[CPTI_MAX];
162 /* Indicates that there is a type value in some namespace, although
163 that is not necessarily in scope at the moment. */
165 tree global_type_node;
167 /* The node that holds the "name" of the global scope. */
168 tree global_scope_name;
170 /* Used only for jumps to as-yet undefined labels, since jumps to
171 defined labels can have their validity checked immediately. */
173 struct named_label_use_list GTY(())
175 struct cp_binding_level *binding_level;
178 location_t o_goto_locus;
179 struct named_label_use_list *next;
182 #define named_label_uses cp_function_chain->x_named_label_uses
184 #define local_names cp_function_chain->x_local_names
186 /* A list of objects which have constructors or destructors
187 which reside in the global scope. The decl is stored in
188 the TREE_VALUE slot and the initializer is stored
189 in the TREE_PURPOSE slot. */
190 tree static_aggregates;
194 /* A node for the integer constants 2, and 3. */
196 tree integer_two_node, integer_three_node;
198 /* A list of all LABEL_DECLs in the function that have names. Here so
199 we can clear out their names' definitions at the end of the
200 function, and so we can check the validity of jumps to these labels. */
202 struct named_label_list GTY(())
204 struct cp_binding_level *binding_level;
209 struct named_label_list *next;
210 unsigned int in_try_scope : 1;
211 unsigned int in_catch_scope : 1;
214 #define named_labels cp_function_chain->x_named_labels
216 /* The number of function bodies which we are currently processing.
217 (Zero if we are at namespace scope, one inside the body of a
218 function, two inside the body of a function in a local class, etc.) */
221 /* States indicating how grokdeclarator() should handle declspecs marked
222 with __attribute__((deprecated)). An object declared as
223 __attribute__((deprecated)) suppresses warnings of uses of other
226 enum deprecated_states {
231 static enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
233 /* True if a declaration with an `extern' linkage specifier is being
235 bool have_extern_spec;
238 /* A TREE_LIST of VAR_DECLs. The TREE_PURPOSE is a RECORD_TYPE or
239 UNION_TYPE; the TREE_VALUE is a VAR_DECL with that type. At the
240 time the VAR_DECL was declared, the type was incomplete. */
242 static GTY(()) tree incomplete_vars;
244 /* Returns the kind of template specialization we are currently
245 processing, given that it's declaration contained N_CLASS_SCOPES
246 explicit scope qualifications. */
249 current_tmpl_spec_kind (int n_class_scopes)
251 int n_template_parm_scopes = 0;
252 int seen_specialization_p = 0;
253 int innermost_specialization_p = 0;
254 struct cp_binding_level *b;
256 /* Scan through the template parameter scopes. */
257 for (b = current_binding_level;
258 b->kind == sk_template_parms;
261 /* If we see a specialization scope inside a parameter scope,
262 then something is wrong. That corresponds to a declaration
265 template <class T> template <> ...
267 which is always invalid since [temp.expl.spec] forbids the
268 specialization of a class member template if the enclosing
269 class templates are not explicitly specialized as well. */
270 if (b->explicit_spec_p)
272 if (n_template_parm_scopes == 0)
273 innermost_specialization_p = 1;
275 seen_specialization_p = 1;
277 else if (seen_specialization_p == 1)
278 return tsk_invalid_member_spec;
280 ++n_template_parm_scopes;
283 /* Handle explicit instantiations. */
284 if (processing_explicit_instantiation)
286 if (n_template_parm_scopes != 0)
287 /* We've seen a template parameter list during an explicit
288 instantiation. For example:
290 template <class T> template void f(int);
292 This is erroneous. */
293 return tsk_invalid_expl_inst;
295 return tsk_expl_inst;
298 if (n_template_parm_scopes < n_class_scopes)
299 /* We've not seen enough template headers to match all the
300 specialized classes present. For example:
302 template <class T> void R<T>::S<T>::f(int);
304 This is invalid; there needs to be one set of template
305 parameters for each class. */
306 return tsk_insufficient_parms;
307 else if (n_template_parm_scopes == n_class_scopes)
308 /* We're processing a non-template declaration (even though it may
309 be a member of a template class.) For example:
311 template <class T> void S<T>::f(int);
313 The `class T' maches the `S<T>', leaving no template headers
314 corresponding to the `f'. */
316 else if (n_template_parm_scopes > n_class_scopes + 1)
317 /* We've got too many template headers. For example:
319 template <> template <class T> void f (T);
321 There need to be more enclosing classes. */
322 return tsk_excessive_parms;
324 /* This must be a template. It's of the form:
326 template <class T> template <class U> void S<T>::f(U);
328 This is a specialization if the innermost level was a
329 specialization; otherwise it's just a definition of the
331 return innermost_specialization_p ? tsk_expl_spec : tsk_template;
334 /* Exit the current scope. */
342 /* When a label goes out of scope, check to see if that label was used
343 in a valid manner, and issue any appropriate warnings or errors. */
346 pop_label (tree label, tree old_value)
348 if (!processing_template_decl)
350 if (DECL_INITIAL (label) == NULL_TREE)
354 error ("label %q+D used but not defined", label);
355 #ifdef USE_MAPPED_LOCATION
356 location = input_location; /* FIXME want (input_filename, (line)0) */
358 location.file = input_filename;
361 /* Avoid crashing later. */
362 define_label (location, DECL_NAME (label));
364 else if (!TREE_USED (label))
365 warning (OPT_Wunused_label, "label %q+D defined but not used", label);
368 SET_IDENTIFIER_LABEL_VALUE (DECL_NAME (label), old_value);
371 /* At the end of a function, all labels declared within the function
372 go out of scope. BLOCK is the top-level block for the
376 pop_labels (tree block)
378 struct named_label_list *link;
380 /* Clear out the definitions of all label names, since their scopes
382 for (link = named_labels; link; link = link->next)
384 pop_label (link->label_decl, link->old_value);
385 /* Put the labels into the "variables" of the top-level block,
386 so debugger can see them. */
387 TREE_CHAIN (link->label_decl) = BLOCK_VARS (block);
388 BLOCK_VARS (block) = link->label_decl;
394 /* The following two routines are used to interface to Objective-C++.
395 The binding level is purposely treated as an opaque type. */
398 objc_get_current_scope (void)
400 return current_binding_level;
403 /* The following routine is used by the NeXT-style SJLJ exceptions;
404 variables get marked 'volatile' so as to not be clobbered by
405 _setjmp()/_longjmp() calls. All variables in the current scope,
406 as well as parent scopes up to (but not including) ENCLOSING_BLK
407 shall be thusly marked. */
410 objc_mark_locals_volatile (void *enclosing_blk)
412 struct cp_binding_level *scope;
414 for (scope = current_binding_level;
415 scope && scope != enclosing_blk;
416 scope = scope->level_chain)
420 for (decl = scope->names; decl; decl = TREE_CHAIN (decl))
421 objc_volatilize_decl (decl);
423 /* Do not climb up past the current function. */
424 if (scope->kind == sk_function_parms)
429 /* Exit a binding level.
430 Pop the level off, and restore the state of the identifier-decl mappings
431 that were in effect when this level was entered.
433 If KEEP == 1, this level had explicit declarations, so
434 and create a "block" (a BLOCK node) for the level
435 to record its declarations and subblocks for symbol table output.
437 If FUNCTIONBODY is nonzero, this level is the body of a function,
438 so create a block as if KEEP were set and also clear out all
441 If REVERSE is nonzero, reverse the order of decls before putting
442 them into the BLOCK. */
445 poplevel (int keep, int reverse, int functionbody)
448 /* The chain of decls was accumulated in reverse order.
449 Put it into forward order, just for cleanliness. */
451 int tmp = functionbody;
452 int real_functionbody;
456 int leaving_for_scope;
459 timevar_push (TV_NAME_LOOKUP);
464 gcc_assert (current_binding_level->kind != sk_class);
466 real_functionbody = (current_binding_level->kind == sk_cleanup
467 ? ((functionbody = 0), tmp) : functionbody);
468 subblocks = functionbody >= 0 ? current_binding_level->blocks : 0;
470 gcc_assert (!VEC_length(cp_class_binding,
471 current_binding_level->class_shadowed));
473 /* We used to use KEEP == 2 to indicate that the new block should go
474 at the beginning of the list of blocks at this binding level,
475 rather than the end. This hack is no longer used. */
476 gcc_assert (keep == 0 || keep == 1);
478 if (current_binding_level->keep)
481 /* Any uses of undefined labels, and any defined labels, now operate
482 under constraints of next binding contour. */
483 if (cfun && !functionbody)
485 struct cp_binding_level *level_chain;
486 level_chain = current_binding_level->level_chain;
489 struct named_label_use_list *uses;
490 struct named_label_list *labels;
491 for (labels = named_labels; labels; labels = labels->next)
492 if (labels->binding_level == current_binding_level)
495 if (current_binding_level->kind == sk_try)
496 labels->in_try_scope = 1;
497 if (current_binding_level->kind == sk_catch)
498 labels->in_catch_scope = 1;
499 for (decl = labels->names_in_scope; decl;
500 decl = TREE_CHAIN (decl))
501 if (decl_jump_unsafe (decl))
502 labels->bad_decls = tree_cons (NULL_TREE, decl,
504 labels->binding_level = level_chain;
505 labels->names_in_scope = level_chain->names;
508 for (uses = named_label_uses; uses; uses = uses->next)
509 if (uses->binding_level == current_binding_level)
511 uses->binding_level = level_chain;
512 uses->names_in_scope = level_chain->names;
517 /* Get the decls in the order they were written.
518 Usually current_binding_level->names is in reverse order.
519 But parameter decls were previously put in forward order. */
522 current_binding_level->names
523 = decls = nreverse (current_binding_level->names);
525 decls = current_binding_level->names;
527 /* If there were any declarations or structure tags in that level,
528 or if this level is a function body,
529 create a BLOCK to record them for the life of this function. */
531 if (keep == 1 || functionbody)
532 block = make_node (BLOCK);
533 if (block != NULL_TREE)
535 BLOCK_VARS (block) = decls;
536 BLOCK_SUBBLOCKS (block) = subblocks;
539 /* In each subblock, record that this is its superior. */
541 for (link = subblocks; link; link = TREE_CHAIN (link))
542 BLOCK_SUPERCONTEXT (link) = block;
544 /* We still support the old for-scope rules, whereby the variables
545 in a for-init statement were in scope after the for-statement
546 ended. We only use the new rules if flag_new_for_scope is
549 = current_binding_level->kind == sk_for && flag_new_for_scope == 1;
551 /* Before we remove the declarations first check for unused variables. */
552 if (warn_unused_variable
553 && !processing_template_decl)
554 for (decl = getdecls (); decl; decl = TREE_CHAIN (decl))
555 if (TREE_CODE (decl) == VAR_DECL
556 && ! TREE_USED (decl)
557 && ! DECL_IN_SYSTEM_HEADER (decl)
558 && DECL_NAME (decl) && ! DECL_ARTIFICIAL (decl))
559 warning (OPT_Wunused_variable, "unused variable %q+D", decl);
561 /* Remove declarations for all the DECLs in this level. */
562 for (link = decls; link; link = TREE_CHAIN (link))
564 if (leaving_for_scope && TREE_CODE (link) == VAR_DECL
567 tree name = DECL_NAME (link);
571 ob = outer_binding (name,
572 IDENTIFIER_BINDING (name),
575 ns_binding = IDENTIFIER_NAMESPACE_VALUE (name);
577 ns_binding = NULL_TREE;
579 if (ob && ob->scope == current_binding_level->level_chain)
580 /* We have something like:
585 and we are leaving the `for' scope. There's no reason to
586 keep the binding of the inner `i' in this case. */
587 pop_binding (name, link);
588 else if ((ob && (TREE_CODE (ob->value) == TYPE_DECL))
589 || (ns_binding && TREE_CODE (ns_binding) == TYPE_DECL))
590 /* Here, we have something like:
598 We must pop the for-scope binding so we know what's a
599 type and what isn't. */
600 pop_binding (name, link);
603 /* Mark this VAR_DECL as dead so that we can tell we left it
604 there only for backward compatibility. */
605 DECL_DEAD_FOR_LOCAL (link) = 1;
607 /* Keep track of what should have happened when we
608 popped the binding. */
611 SET_DECL_SHADOWED_FOR_VAR (link, ob->value);
612 DECL_HAS_SHADOWED_FOR_VAR_P (link) = 1;
615 /* Add it to the list of dead variables in the next
616 outermost binding to that we can remove these when we
617 leave that binding. */
618 current_binding_level->level_chain->dead_vars_from_for
619 = tree_cons (NULL_TREE, link,
620 current_binding_level->level_chain->
623 /* Although we don't pop the cxx_binding, we do clear
624 its SCOPE since the scope is going away now. */
625 IDENTIFIER_BINDING (name)->scope
626 = current_binding_level->level_chain;
633 /* Remove the binding. */
636 if (TREE_CODE (decl) == TREE_LIST)
637 decl = TREE_VALUE (decl);
640 if (TREE_CODE (name) == OVERLOAD)
641 name = OVL_FUNCTION (name);
643 gcc_assert (DECL_P (name));
644 pop_binding (DECL_NAME (name), decl);
648 /* Remove declarations for any `for' variables from inner scopes
649 that we kept around. */
650 for (link = current_binding_level->dead_vars_from_for;
651 link; link = TREE_CHAIN (link))
652 pop_binding (DECL_NAME (TREE_VALUE (link)), TREE_VALUE (link));
654 /* Restore the IDENTIFIER_TYPE_VALUEs. */
655 for (link = current_binding_level->type_shadowed;
656 link; link = TREE_CHAIN (link))
657 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (link), TREE_VALUE (link));
659 /* Restore the IDENTIFIER_LABEL_VALUEs for local labels. */
660 for (link = current_binding_level->shadowed_labels;
662 link = TREE_CHAIN (link))
663 pop_label (TREE_VALUE (link), TREE_PURPOSE (link));
665 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
666 list if a `using' declaration put them there. The debugging
667 back-ends won't understand OVERLOAD, so we remove them here.
668 Because the BLOCK_VARS are (temporarily) shared with
669 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
670 popped all the bindings. */
675 for (d = &BLOCK_VARS (block); *d; )
677 if (TREE_CODE (*d) == TREE_LIST)
678 *d = TREE_CHAIN (*d);
680 d = &TREE_CHAIN (*d);
684 /* If the level being exited is the top level of a function,
685 check over all the labels. */
688 /* Since this is the top level block of a function, the vars are
689 the function's parameters. Don't leave them in the BLOCK
690 because they are found in the FUNCTION_DECL instead. */
691 BLOCK_VARS (block) = 0;
695 kind = current_binding_level->kind;
696 if (kind == sk_cleanup)
700 /* If this is a temporary binding created for a cleanup, then we'll
701 have pushed a statement list level. Pop that, create a new
702 BIND_EXPR for the block, and insert it into the stream. */
703 stmt = pop_stmt_list (current_binding_level->statement_list);
704 stmt = c_build_bind_expr (block, stmt);
710 DECL_INITIAL (current_function_decl) = block;
712 current_binding_level->blocks
713 = chainon (current_binding_level->blocks, block);
715 /* If we did not make a block for the level just exited,
716 any blocks made for inner levels
717 (since they cannot be recorded as subblocks in that level)
718 must be carried forward so they will later become subblocks
719 of something else. */
721 current_binding_level->blocks
722 = chainon (current_binding_level->blocks, subblocks);
724 /* Each and every BLOCK node created here in `poplevel' is important
725 (e.g. for proper debugging information) so if we created one
726 earlier, mark it as "used". */
728 TREE_USED (block) = 1;
730 /* All temporary bindings created for cleanups are popped silently. */
731 if (kind == sk_cleanup)
734 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, block);
737 /* Insert BLOCK at the end of the list of subblocks of the
738 current binding level. This is used when a BIND_EXPR is expanded,
739 to handle the BLOCK node inside the BIND_EXPR. */
742 insert_block (tree block)
744 TREE_USED (block) = 1;
745 current_binding_level->blocks
746 = chainon (current_binding_level->blocks, block);
749 /* Walk all the namespaces contained NAMESPACE, including NAMESPACE
750 itself, calling F for each. The DATA is passed to F as well. */
753 walk_namespaces_r (tree namespace, walk_namespaces_fn f, void* data)
756 tree current = NAMESPACE_LEVEL (namespace)->namespaces;
758 result |= (*f) (namespace, data);
760 for (; current; current = TREE_CHAIN (current))
761 result |= walk_namespaces_r (current, f, data);
766 /* Walk all the namespaces, calling F for each. The DATA is passed to
770 walk_namespaces (walk_namespaces_fn f, void* data)
772 return walk_namespaces_r (global_namespace, f, data);
775 /* Call wrapup_globals_declarations for the globals in NAMESPACE. If
776 DATA is non-NULL, this is the last time we will call
777 wrapup_global_declarations for this NAMESPACE. */
780 wrapup_globals_for_namespace (tree namespace, void* data)
782 struct cp_binding_level *level = NAMESPACE_LEVEL (namespace);
783 VEC(tree,gc) *statics = level->static_decls;
784 tree *vec = VEC_address (tree, statics);
785 int len = VEC_length (tree, statics);
786 int last_time = (data != 0);
790 check_global_declarations (vec, len);
791 emit_debug_global_declarations (vec, len);
795 /* Write out any globals that need to be output. */
796 return wrapup_global_declarations (vec, len);
800 /* In C++, you don't have to write `struct S' to refer to `S'; you
801 can just use `S'. We accomplish this by creating a TYPE_DECL as
802 if the user had written `typedef struct S S'. Create and return
803 the TYPE_DECL for TYPE. */
806 create_implicit_typedef (tree name, tree type)
810 decl = build_decl (TYPE_DECL, name, type);
811 DECL_ARTIFICIAL (decl) = 1;
812 /* There are other implicit type declarations, like the one *within*
813 a class that allows you to write `S::S'. We must distinguish
815 SET_DECL_IMPLICIT_TYPEDEF_P (decl);
816 TYPE_NAME (type) = decl;
821 /* Remember a local name for name-mangling purposes. */
824 push_local_name (tree decl)
829 timevar_push (TV_NAME_LOOKUP);
831 name = DECL_NAME (decl);
833 nelts = VEC_length (tree, local_names);
834 for (i = 0; i < nelts; i++)
836 t = VEC_index (tree, local_names, i);
837 if (DECL_NAME (t) == name)
839 if (!DECL_LANG_SPECIFIC (decl))
840 retrofit_lang_decl (decl);
841 DECL_LANG_SPECIFIC (decl)->decl_flags.u2sel = 1;
842 if (DECL_LANG_SPECIFIC (t))
843 DECL_DISCRIMINATOR (decl) = DECL_DISCRIMINATOR (t) + 1;
845 DECL_DISCRIMINATOR (decl) = 1;
847 VEC_replace (tree, local_names, i, decl);
848 timevar_pop (TV_NAME_LOOKUP);
853 VEC_safe_push (tree, gc, local_names, decl);
854 timevar_pop (TV_NAME_LOOKUP);
857 /* Subroutine of duplicate_decls: return truthvalue of whether
858 or not types of these decls match.
860 For C++, we must compare the parameter list so that `int' can match
861 `int&' in a parameter position, but `int&' is not confused with
865 decls_match (tree newdecl, tree olddecl)
869 if (newdecl == olddecl)
872 if (TREE_CODE (newdecl) != TREE_CODE (olddecl))
873 /* If the two DECLs are not even the same kind of thing, we're not
874 interested in their types. */
877 if (TREE_CODE (newdecl) == FUNCTION_DECL)
879 tree f1 = TREE_TYPE (newdecl);
880 tree f2 = TREE_TYPE (olddecl);
881 tree p1 = TYPE_ARG_TYPES (f1);
882 tree p2 = TYPE_ARG_TYPES (f2);
884 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
885 && ! (DECL_EXTERN_C_P (newdecl)
886 && DECL_EXTERN_C_P (olddecl)))
889 if (TREE_CODE (f1) != TREE_CODE (f2))
892 if (same_type_p (TREE_TYPE (f1), TREE_TYPE (f2)))
894 if (p2 == NULL_TREE && DECL_EXTERN_C_P (olddecl)
895 && (DECL_BUILT_IN (olddecl)
896 #ifndef NO_IMPLICIT_EXTERN_C
897 || (DECL_IN_SYSTEM_HEADER (newdecl) && !DECL_CLASS_SCOPE_P (newdecl))
898 || (DECL_IN_SYSTEM_HEADER (olddecl) && !DECL_CLASS_SCOPE_P (olddecl))
902 types_match = self_promoting_args_p (p1);
903 if (p1 == void_list_node)
904 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
906 #ifndef NO_IMPLICIT_EXTERN_C
907 else if (p1 == NULL_TREE
908 && (DECL_EXTERN_C_P (olddecl)
909 && DECL_IN_SYSTEM_HEADER (olddecl)
910 && !DECL_CLASS_SCOPE_P (olddecl))
911 && (DECL_EXTERN_C_P (newdecl)
912 && DECL_IN_SYSTEM_HEADER (newdecl)
913 && !DECL_CLASS_SCOPE_P (newdecl)))
915 types_match = self_promoting_args_p (p2);
916 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
920 types_match = compparms (p1, p2);
925 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
927 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl))
928 != TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)))
931 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
932 DECL_TEMPLATE_PARMS (olddecl)))
935 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
936 types_match = same_type_p (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl)),
937 TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl)));
939 types_match = decls_match (DECL_TEMPLATE_RESULT (olddecl),
940 DECL_TEMPLATE_RESULT (newdecl));
944 /* Need to check scope for variable declaration (VAR_DECL).
945 For typedef (TYPE_DECL), scope is ignored. */
946 if (TREE_CODE (newdecl) == VAR_DECL
947 && CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
950 if (TREE_TYPE (newdecl) == error_mark_node)
951 types_match = TREE_TYPE (olddecl) == error_mark_node;
952 else if (TREE_TYPE (olddecl) == NULL_TREE)
953 types_match = TREE_TYPE (newdecl) == NULL_TREE;
954 else if (TREE_TYPE (newdecl) == NULL_TREE)
957 types_match = comptypes (TREE_TYPE (newdecl),
959 COMPARE_REDECLARATION);
965 /* If NEWDECL is `static' and an `extern' was seen previously,
966 warn about it. OLDDECL is the previous declaration.
968 Note that this does not apply to the C++ case of declaring
969 a variable `extern const' and then later `const'.
971 Don't complain about built-in functions, since they are beyond
972 the user's control. */
975 warn_extern_redeclared_static (tree newdecl, tree olddecl)
979 if (TREE_CODE (newdecl) == TYPE_DECL
980 || TREE_CODE (newdecl) == TEMPLATE_DECL
981 || TREE_CODE (newdecl) == CONST_DECL
982 || TREE_CODE (newdecl) == NAMESPACE_DECL)
985 /* Don't get confused by static member functions; that's a different
987 if (TREE_CODE (newdecl) == FUNCTION_DECL
988 && DECL_STATIC_FUNCTION_P (newdecl))
991 /* If the old declaration was `static', or the new one isn't, then
992 then everything is OK. */
993 if (DECL_THIS_STATIC (olddecl) || !DECL_THIS_STATIC (newdecl))
996 /* It's OK to declare a builtin function as `static'. */
997 if (TREE_CODE (olddecl) == FUNCTION_DECL
998 && DECL_ARTIFICIAL (olddecl))
1001 name = DECL_ASSEMBLER_NAME (newdecl);
1002 pedwarn ("%qD was declared %<extern%> and later %<static%>", newdecl);
1003 pedwarn ("previous declaration of %q+D", olddecl);
1006 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1007 function templates. If their exception specifications do not
1008 match, issue an a diagnostic. */
1011 check_redeclaration_exception_specification (tree new_decl,
1016 tree new_exceptions;
1017 tree old_exceptions;
1019 new_type = TREE_TYPE (new_decl);
1020 new_exceptions = TYPE_RAISES_EXCEPTIONS (new_type);
1021 old_type = TREE_TYPE (old_decl);
1022 old_exceptions = TYPE_RAISES_EXCEPTIONS (old_type);
1026 If any declaration of a function has an exception-specification,
1027 all declarations, including the definition and an explicit
1028 specialization, of that function shall have an
1029 exception-specification with the same set of type-ids. */
1030 if ((pedantic || ! DECL_IN_SYSTEM_HEADER (old_decl))
1031 && ! DECL_IS_BUILTIN (old_decl)
1033 && !comp_except_specs (new_exceptions, old_exceptions,
1036 error ("declaration of %qF throws different exceptions", new_decl);
1037 error ("from previous declaration %q+F", old_decl);
1041 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1042 If the redeclaration is invalid, a diagnostic is issued, and the
1043 error_mark_node is returned. Otherwise, OLDDECL is returned.
1045 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1048 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1051 duplicate_decls (tree newdecl, tree olddecl, bool newdecl_is_friend)
1053 unsigned olddecl_uid = DECL_UID (olddecl);
1054 int olddecl_friend = 0, types_match = 0, hidden_friend = 0;
1055 int new_defines_function = 0;
1058 if (newdecl == olddecl)
1061 types_match = decls_match (newdecl, olddecl);
1063 /* If either the type of the new decl or the type of the old decl is an
1064 error_mark_node, then that implies that we have already issued an
1065 error (earlier) for some bogus type specification, and in that case,
1066 it is rather pointless to harass the user with yet more error message
1067 about the same declaration, so just pretend the types match here. */
1068 if (TREE_TYPE (newdecl) == error_mark_node
1069 || TREE_TYPE (olddecl) == error_mark_node)
1072 if (DECL_P (olddecl)
1073 && TREE_CODE (newdecl) == FUNCTION_DECL
1074 && TREE_CODE (olddecl) == FUNCTION_DECL
1075 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1077 if (DECL_DECLARED_INLINE_P (newdecl)
1078 && DECL_UNINLINABLE (newdecl)
1079 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1080 /* Already warned elsewhere. */;
1081 else if (DECL_DECLARED_INLINE_P (olddecl)
1082 && DECL_UNINLINABLE (olddecl)
1083 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1084 /* Already warned. */;
1085 else if (DECL_DECLARED_INLINE_P (newdecl)
1086 && DECL_UNINLINABLE (olddecl)
1087 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1089 warning (OPT_Wattributes, "function %q+D redeclared as inline",
1091 warning (OPT_Wattributes, "previous declaration of %q+D "
1092 "with attribute noinline", olddecl);
1094 else if (DECL_DECLARED_INLINE_P (olddecl)
1095 && DECL_UNINLINABLE (newdecl)
1096 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1098 warning (OPT_Wattributes, "function %q+D redeclared with "
1099 "attribute noinline", newdecl);
1100 warning (OPT_Wattributes, "previous declaration of %q+D was inline",
1105 /* Check for redeclaration and other discrepancies. */
1106 if (TREE_CODE (olddecl) == FUNCTION_DECL
1107 && DECL_ARTIFICIAL (olddecl))
1109 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl));
1110 if (TREE_CODE (newdecl) != FUNCTION_DECL)
1112 /* Avoid warnings redeclaring built-ins which have not been
1113 explicitly declared. */
1114 if (DECL_ANTICIPATED (olddecl))
1117 /* If you declare a built-in or predefined function name as static,
1118 the old definition is overridden, but optionally warn this was a
1119 bad choice of name. */
1120 if (! TREE_PUBLIC (newdecl))
1122 warning (OPT_Wshadow, "shadowing %s function %q#D",
1123 DECL_BUILT_IN (olddecl) ? "built-in" : "library",
1125 /* Discard the old built-in function. */
1128 /* If the built-in is not ansi, then programs can override
1129 it even globally without an error. */
1130 else if (! DECL_BUILT_IN (olddecl))
1131 warning (0, "library function %q#D redeclared as non-function %q#D",
1135 error ("declaration of %q#D", newdecl);
1136 error ("conflicts with built-in declaration %q#D",
1141 else if (!types_match)
1143 /* Avoid warnings redeclaring built-ins which have not been
1144 explicitly declared. */
1145 if (DECL_ANTICIPATED (olddecl))
1147 /* Deal with fileptr_type_node. FILE type is not known
1148 at the time we create the builtins. */
1151 for (t1 = TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1152 t2 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1154 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1157 else if (TREE_VALUE (t2) == fileptr_type_node)
1159 tree t = TREE_VALUE (t1);
1161 if (TREE_CODE (t) == POINTER_TYPE
1162 && TYPE_NAME (TREE_TYPE (t))
1163 && DECL_NAME (TYPE_NAME (TREE_TYPE (t)))
1164 == get_identifier ("FILE")
1165 && compparms (TREE_CHAIN (t1), TREE_CHAIN (t2)))
1167 tree oldargs = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1169 TYPE_ARG_TYPES (TREE_TYPE (olddecl))
1170 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1171 types_match = decls_match (newdecl, olddecl);
1173 return duplicate_decls (newdecl, olddecl,
1175 TYPE_ARG_TYPES (TREE_TYPE (olddecl)) = oldargs;
1178 else if (! same_type_p (TREE_VALUE (t1), TREE_VALUE (t2)))
1181 else if ((DECL_EXTERN_C_P (newdecl)
1182 && DECL_EXTERN_C_P (olddecl))
1183 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1184 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1186 /* A near match; override the builtin. */
1188 if (TREE_PUBLIC (newdecl))
1190 warning (0, "new declaration %q#D", newdecl);
1191 warning (0, "ambiguates built-in declaration %q#D",
1195 warning (OPT_Wshadow, "shadowing %s function %q#D",
1196 DECL_BUILT_IN (olddecl) ? "built-in" : "library",
1200 /* Discard the old built-in function. */
1203 /* Replace the old RTL to avoid problems with inlining. */
1204 COPY_DECL_RTL (newdecl, olddecl);
1206 /* Even if the types match, prefer the new declarations type for
1207 built-ins which have not been explicitly declared, for
1208 exception lists, etc... */
1209 else if (DECL_ANTICIPATED (olddecl))
1211 tree type = TREE_TYPE (newdecl);
1212 tree attribs = (*targetm.merge_type_attributes)
1213 (TREE_TYPE (olddecl), type);
1215 type = cp_build_type_attribute_variant (type, attribs);
1216 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = type;
1219 /* Whether or not the builtin can throw exceptions has no
1220 bearing on this declarator. */
1221 TREE_NOTHROW (olddecl) = 0;
1223 if (DECL_THIS_STATIC (newdecl) && !DECL_THIS_STATIC (olddecl))
1225 /* If a builtin function is redeclared as `static', merge
1226 the declarations, but make the original one static. */
1227 DECL_THIS_STATIC (olddecl) = 1;
1228 TREE_PUBLIC (olddecl) = 0;
1230 /* Make the old declaration consistent with the new one so
1231 that all remnants of the builtin-ness of this function
1232 will be banished. */
1233 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1234 COPY_DECL_RTL (newdecl, olddecl);
1237 else if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1239 if ((TREE_CODE (olddecl) == TYPE_DECL && DECL_ARTIFICIAL (olddecl)
1240 && TREE_CODE (newdecl) != TYPE_DECL
1241 && ! (TREE_CODE (newdecl) == TEMPLATE_DECL
1242 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL))
1243 || (TREE_CODE (newdecl) == TYPE_DECL && DECL_ARTIFICIAL (newdecl)
1244 && TREE_CODE (olddecl) != TYPE_DECL
1245 && ! (TREE_CODE (olddecl) == TEMPLATE_DECL
1246 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
1249 /* We do nothing special here, because C++ does such nasty
1250 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1251 get shadowed, and know that if we need to find a TYPE_DECL
1252 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1253 slot of the identifier. */
1257 if ((TREE_CODE (newdecl) == FUNCTION_DECL
1258 && DECL_FUNCTION_TEMPLATE_P (olddecl))
1259 || (TREE_CODE (olddecl) == FUNCTION_DECL
1260 && DECL_FUNCTION_TEMPLATE_P (newdecl)))
1263 error ("%q#D redeclared as different kind of symbol", newdecl);
1264 if (TREE_CODE (olddecl) == TREE_LIST)
1265 olddecl = TREE_VALUE (olddecl);
1266 error ("previous declaration of %q+#D", olddecl);
1268 return error_mark_node;
1270 else if (!types_match)
1272 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
1273 /* These are certainly not duplicate declarations; they're
1274 from different scopes. */
1277 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1279 /* The name of a class template may not be declared to refer to
1280 any other template, class, function, object, namespace, value,
1281 or type in the same scope. */
1282 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == TYPE_DECL
1283 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1285 error ("declaration of template %q#D", newdecl);
1286 error ("conflicts with previous declaration %q+#D", olddecl);
1288 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == FUNCTION_DECL
1289 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == FUNCTION_DECL
1290 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl))),
1291 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl))))
1292 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1293 DECL_TEMPLATE_PARMS (olddecl))
1294 /* Template functions can be disambiguated by
1296 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl)),
1297 TREE_TYPE (TREE_TYPE (olddecl))))
1299 error ("new declaration %q#D", newdecl);
1300 error ("ambiguates old declaration %q+#D", olddecl);
1304 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1306 if (DECL_EXTERN_C_P (newdecl) && DECL_EXTERN_C_P (olddecl))
1308 error ("declaration of C function %q#D conflicts with",
1310 error ("previous declaration %q+#D here", olddecl);
1312 else if (compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1313 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1315 error ("new declaration %q#D", newdecl);
1316 error ("ambiguates old declaration %q+#D", olddecl);
1323 error ("conflicting declaration %q#D", newdecl);
1324 error ("%q+D has a previous declaration as %q#D", olddecl, olddecl);
1325 return error_mark_node;
1328 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1329 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1330 && (!DECL_TEMPLATE_INFO (newdecl)
1331 || (DECL_TI_TEMPLATE (newdecl)
1332 != DECL_TI_TEMPLATE (olddecl))))
1333 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1334 && (!DECL_TEMPLATE_INFO (olddecl)
1335 || (DECL_TI_TEMPLATE (olddecl)
1336 != DECL_TI_TEMPLATE (newdecl))))))
1337 /* It's OK to have a template specialization and a non-template
1338 with the same type, or to have specializations of two
1339 different templates with the same type. Note that if one is a
1340 specialization, and the other is an instantiation of the same
1341 template, that we do not exit at this point. That situation
1342 can occur if we instantiate a template class, and then
1343 specialize one of its methods. This situation is valid, but
1344 the declarations must be merged in the usual way. */
1346 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1347 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1348 && !DECL_USE_TEMPLATE (newdecl))
1349 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1350 && !DECL_USE_TEMPLATE (olddecl))))
1351 /* One of the declarations is a template instantiation, and the
1352 other is not a template at all. That's OK. */
1354 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1356 /* In [namespace.alias] we have:
1358 In a declarative region, a namespace-alias-definition can be
1359 used to redefine a namespace-alias declared in that declarative
1360 region to refer only to the namespace to which it already
1363 Therefore, if we encounter a second alias directive for the same
1364 alias, we can just ignore the second directive. */
1365 if (DECL_NAMESPACE_ALIAS (newdecl)
1366 && (DECL_NAMESPACE_ALIAS (newdecl)
1367 == DECL_NAMESPACE_ALIAS (olddecl)))
1369 /* [namespace.alias]
1371 A namespace-name or namespace-alias shall not be declared as
1372 the name of any other entity in the same declarative region.
1373 A namespace-name defined at global scope shall not be
1374 declared as the name of any other entity in any global scope
1376 error ("declaration of namespace %qD conflicts with", newdecl);
1377 error ("previous declaration of namespace %q+D here", olddecl);
1378 return error_mark_node;
1382 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1385 error (errmsg, newdecl);
1386 if (DECL_NAME (olddecl) != NULL_TREE)
1387 error ((DECL_INITIAL (olddecl) && namespace_bindings_p ())
1388 ? "%q+#D previously defined here"
1389 : "%q+#D previously declared here", olddecl);
1390 return error_mark_node;
1392 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1393 && DECL_INITIAL (olddecl) != NULL_TREE
1394 && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) == NULL_TREE
1395 && TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != NULL_TREE)
1397 /* Prototype decl follows defn w/o prototype. */
1398 warning (0, "prototype for %q+#D", newdecl);
1399 warning (0, "%Jfollows non-prototype definition here", olddecl);
1401 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1402 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1404 /* extern "C" int foo ();
1405 int foo () { bar (); }
1407 if (current_lang_depth () == 0)
1408 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1411 error ("previous declaration of %q+#D with %qL linkage",
1412 olddecl, DECL_LANGUAGE (olddecl));
1413 error ("conflicts with new declaration with %qL linkage",
1414 DECL_LANGUAGE (newdecl));
1418 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1420 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1422 tree t1 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1423 tree t2 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1426 if (TREE_CODE (TREE_TYPE (newdecl)) == METHOD_TYPE)
1427 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2);
1429 for (; t1 && t1 != void_list_node;
1430 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1431 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1433 if (1 == simple_cst_equal (TREE_PURPOSE (t1),
1436 pedwarn ("default argument given for parameter %d of %q#D",
1438 pedwarn ("after previous specification in %q+#D", olddecl);
1442 error ("default argument given for parameter %d of %q#D",
1444 error ("after previous specification in %q+#D",
1449 if (DECL_DECLARED_INLINE_P (newdecl)
1450 && ! DECL_DECLARED_INLINE_P (olddecl)
1451 && TREE_ADDRESSABLE (olddecl) && warn_inline)
1453 warning (0, "%q#D was used before it was declared inline", newdecl);
1454 warning (0, "%Jprevious non-inline declaration here", olddecl);
1459 /* Do not merge an implicit typedef with an explicit one. In:
1463 typedef class A A __attribute__ ((foo));
1465 the attribute should apply only to the typedef. */
1466 if (TREE_CODE (olddecl) == TYPE_DECL
1467 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1468 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1471 /* If new decl is `static' and an `extern' was seen previously,
1473 warn_extern_redeclared_static (newdecl, olddecl);
1475 /* We have committed to returning 1 at this point. */
1476 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1478 /* Now that functions must hold information normally held
1479 by field decls, there is extra work to do so that
1480 declaration information does not get destroyed during
1482 if (DECL_VINDEX (olddecl))
1483 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1484 if (DECL_CONTEXT (olddecl))
1485 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1486 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1487 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1488 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1489 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1490 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1491 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1492 SET_OVERLOADED_OPERATOR_CODE
1493 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1494 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1496 /* Optionally warn about more than one declaration for the same
1497 name, but don't warn about a function declaration followed by a
1499 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1500 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1501 /* Don't warn about extern decl followed by definition. */
1502 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1503 /* Don't warn about friends, let add_friend take care of it. */
1504 && ! (newdecl_is_friend || DECL_FRIEND_P (olddecl)))
1506 warning (OPT_Wredundant_decls, "redundant redeclaration of %qD in same scope", newdecl);
1507 warning (OPT_Wredundant_decls, "previous declaration of %q+D", olddecl);
1511 /* Deal with C++: must preserve virtual function table size. */
1512 if (TREE_CODE (olddecl) == TYPE_DECL)
1514 tree newtype = TREE_TYPE (newdecl);
1515 tree oldtype = TREE_TYPE (olddecl);
1517 if (newtype != error_mark_node && oldtype != error_mark_node
1518 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1519 CLASSTYPE_FRIEND_CLASSES (newtype)
1520 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1522 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1525 /* Copy all the DECL_... slots specified in the new decl
1526 except for any that we copy here from the old type. */
1527 DECL_ATTRIBUTES (newdecl)
1528 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1530 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1534 old_result = DECL_TEMPLATE_RESULT (olddecl);
1535 new_result = DECL_TEMPLATE_RESULT (newdecl);
1536 TREE_TYPE (olddecl) = TREE_TYPE (old_result);
1537 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1538 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1539 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1541 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1543 DECL_INLINE (old_result)
1544 |= DECL_INLINE (new_result);
1545 DECL_DECLARED_INLINE_P (old_result)
1546 |= DECL_DECLARED_INLINE_P (new_result);
1547 check_redeclaration_exception_specification (newdecl, olddecl);
1550 /* If the new declaration is a definition, update the file and
1551 line information on the declaration. */
1552 if (DECL_INITIAL (old_result) == NULL_TREE
1553 && DECL_INITIAL (new_result) != NULL_TREE)
1555 DECL_SOURCE_LOCATION (olddecl)
1556 = DECL_SOURCE_LOCATION (old_result)
1557 = DECL_SOURCE_LOCATION (newdecl);
1558 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1559 DECL_ARGUMENTS (old_result)
1560 = DECL_ARGUMENTS (new_result);
1568 /* Automatically handles default parameters. */
1569 tree oldtype = TREE_TYPE (olddecl);
1572 /* Merge the data types specified in the two decls. */
1573 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1575 /* If merge_types produces a non-typedef type, just use the old type. */
1576 if (TREE_CODE (newdecl) == TYPE_DECL
1577 && newtype == DECL_ORIGINAL_TYPE (newdecl))
1580 if (TREE_CODE (newdecl) == VAR_DECL)
1582 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
1583 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
1584 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl)
1585 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl);
1586 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
1587 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
1590 /* Do this after calling `merge_types' so that default
1591 parameters don't confuse us. */
1592 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1593 check_redeclaration_exception_specification (newdecl, olddecl);
1594 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
1596 /* Lay the type out, unless already done. */
1597 if (! same_type_p (newtype, oldtype)
1598 && TREE_TYPE (newdecl) != error_mark_node
1599 && !(processing_template_decl && uses_template_parms (newdecl)))
1600 layout_type (TREE_TYPE (newdecl));
1602 if ((TREE_CODE (newdecl) == VAR_DECL
1603 || TREE_CODE (newdecl) == PARM_DECL
1604 || TREE_CODE (newdecl) == RESULT_DECL
1605 || TREE_CODE (newdecl) == FIELD_DECL
1606 || TREE_CODE (newdecl) == TYPE_DECL)
1607 && !(processing_template_decl && uses_template_parms (newdecl)))
1608 layout_decl (newdecl, 0);
1610 /* Merge the type qualifiers. */
1611 if (TREE_READONLY (newdecl))
1612 TREE_READONLY (olddecl) = 1;
1613 if (TREE_THIS_VOLATILE (newdecl))
1614 TREE_THIS_VOLATILE (olddecl) = 1;
1615 if (TREE_NOTHROW (newdecl))
1616 TREE_NOTHROW (olddecl) = 1;
1618 /* Merge deprecatedness. */
1619 if (TREE_DEPRECATED (newdecl))
1620 TREE_DEPRECATED (olddecl) = 1;
1622 /* Merge the initialization information. */
1623 if (DECL_INITIAL (newdecl) == NULL_TREE
1624 && DECL_INITIAL (olddecl) != NULL_TREE)
1626 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1627 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1628 if (CAN_HAVE_FULL_LANG_DECL_P (newdecl)
1629 && DECL_LANG_SPECIFIC (newdecl)
1630 && DECL_LANG_SPECIFIC (olddecl))
1632 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1633 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1637 /* Merge the section attribute.
1638 We want to issue an error if the sections conflict but that must be
1639 done later in decl_attributes since we are called before attributes
1641 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1642 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1644 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1646 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1647 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1648 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1649 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1650 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1651 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
1652 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1653 DECL_IS_PURE (newdecl) |= DECL_IS_PURE (olddecl);
1654 /* Keep the old RTL. */
1655 COPY_DECL_RTL (olddecl, newdecl);
1657 else if (TREE_CODE (newdecl) == VAR_DECL
1658 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
1660 /* Keep the old RTL. We cannot keep the old RTL if the old
1661 declaration was for an incomplete object and the new
1662 declaration is not since many attributes of the RTL will
1664 COPY_DECL_RTL (olddecl, newdecl);
1667 /* If cannot merge, then use the new type and qualifiers,
1668 and don't preserve the old rtl. */
1671 /* Clean out any memory we had of the old declaration. */
1672 tree oldstatic = value_member (olddecl, static_aggregates);
1674 TREE_VALUE (oldstatic) = error_mark_node;
1676 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1677 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1678 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1679 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1682 /* Merge the storage class information. */
1683 merge_weak (newdecl, olddecl);
1685 DECL_ONE_ONLY (newdecl) |= DECL_ONE_ONLY (olddecl);
1686 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
1687 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1688 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
1689 if (! DECL_EXTERNAL (olddecl))
1690 DECL_EXTERNAL (newdecl) = 0;
1692 new_template = NULL_TREE;
1693 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
1695 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
1696 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
1697 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
1698 DECL_TEMPLATE_INSTANTIATED (newdecl)
1699 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
1701 /* If the OLDDECL is an instantiation and/or specialization,
1702 then the NEWDECL must be too. But, it may not yet be marked
1703 as such if the caller has created NEWDECL, but has not yet
1704 figured out that it is a redeclaration. */
1705 if (!DECL_USE_TEMPLATE (newdecl))
1706 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
1708 /* Don't really know how much of the language-specific
1709 values we should copy from old to new. */
1710 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
1711 DECL_LANG_SPECIFIC (newdecl)->decl_flags.u2 =
1712 DECL_LANG_SPECIFIC (olddecl)->decl_flags.u2;
1713 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
1714 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
1715 if (DECL_TEMPLATE_INFO (newdecl))
1716 new_template = DECL_TI_TEMPLATE (newdecl);
1717 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
1718 DECL_INITIALIZED_IN_CLASS_P (newdecl)
1719 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
1720 olddecl_friend = DECL_FRIEND_P (olddecl);
1721 hidden_friend = (DECL_ANTICIPATED (olddecl)
1722 && DECL_HIDDEN_FRIEND_P (olddecl)
1723 && newdecl_is_friend);
1725 /* Only functions have DECL_BEFRIENDING_CLASSES. */
1726 if (TREE_CODE (newdecl) == FUNCTION_DECL
1727 || DECL_FUNCTION_TEMPLATE_P (newdecl))
1729 DECL_BEFRIENDING_CLASSES (newdecl)
1730 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
1731 DECL_BEFRIENDING_CLASSES (olddecl));
1732 /* DECL_THUNKS is only valid for virtual functions,
1733 otherwise it is a DECL_FRIEND_CONTEXT. */
1734 if (DECL_VIRTUAL_P (newdecl))
1735 DECL_THUNKS (newdecl) = DECL_THUNKS (olddecl);
1739 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1741 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
1742 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
1744 /* If newdecl is not a specialization, then it is not a
1745 template-related function at all. And that means that we
1746 should have exited above, returning 0. */
1747 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
1749 if (TREE_USED (olddecl))
1750 /* From [temp.expl.spec]:
1752 If a template, a member template or the member of a class
1753 template is explicitly specialized then that
1754 specialization shall be declared before the first use of
1755 that specialization that would cause an implicit
1756 instantiation to take place, in every translation unit in
1757 which such a use occurs. */
1758 error ("explicit specialization of %qD after first use",
1761 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
1763 /* [temp.expl.spec/14] We don't inline explicit specialization
1764 just because the primary template says so. */
1768 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
1769 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
1771 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
1773 /* If either decl says `inline', this fn is inline, unless
1774 its definition was passed already. */
1775 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == NULL_TREE)
1776 DECL_INLINE (olddecl) = 1;
1777 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1779 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1780 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1783 /* Preserve abstractness on cloned [cd]tors. */
1784 DECL_ABSTRACT (newdecl) = DECL_ABSTRACT (olddecl);
1788 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1789 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
1790 COPY_DECL_RTL (newdecl, olddecl);
1792 if (! types_match || new_defines_function)
1794 /* These need to be copied so that the names are available.
1795 Note that if the types do match, we'll preserve inline
1796 info and other bits, but if not, we won't. */
1797 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
1798 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
1800 if (new_defines_function)
1801 /* If defining a function declared with other language
1802 linkage, use the previously declared language linkage. */
1803 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1804 else if (types_match)
1806 /* If redeclaring a builtin function, and not a definition,
1807 it stays built in. */
1808 if (DECL_BUILT_IN (olddecl))
1810 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1811 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1812 /* If we're keeping the built-in definition, keep the rtl,
1813 regardless of declaration matches. */
1814 COPY_DECL_RTL (olddecl, newdecl);
1817 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1818 /* Don't clear out the arguments if we're redefining a function. */
1819 if (DECL_ARGUMENTS (olddecl))
1820 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1823 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1824 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
1826 /* Now preserve various other info from the definition. */
1827 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
1828 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
1829 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
1830 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1832 /* Warn about conflicting visibility specifications. */
1833 if (DECL_VISIBILITY_SPECIFIED (olddecl)
1834 && DECL_VISIBILITY_SPECIFIED (newdecl)
1835 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
1837 warning (OPT_Wattributes, "%q+D: visibility attribute ignored "
1838 "because it", newdecl);
1839 warning (OPT_Wattributes, "%Jconflicts with previous "
1840 "declaration here", olddecl);
1842 /* Choose the declaration which specified visibility. */
1843 if (DECL_VISIBILITY_SPECIFIED (olddecl))
1845 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
1846 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
1848 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
1849 so keep this behavior. */
1850 if (TREE_CODE (newdecl) == VAR_DECL && DECL_HAS_INIT_PRIORITY_P (newdecl))
1852 SET_DECL_INIT_PRIORITY (olddecl, DECL_INIT_PRIORITY (newdecl));
1853 DECL_HAS_INIT_PRIORITY_P (olddecl) = 1;
1856 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
1857 with that from NEWDECL below. */
1858 if (DECL_LANG_SPECIFIC (olddecl))
1860 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
1861 != DECL_LANG_SPECIFIC (newdecl));
1862 ggc_free (DECL_LANG_SPECIFIC (olddecl));
1865 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1869 function_size = sizeof (struct tree_decl_common);
1871 memcpy ((char *) olddecl + sizeof (struct tree_common),
1872 (char *) newdecl + sizeof (struct tree_common),
1873 function_size - sizeof (struct tree_common));
1875 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
1876 (char *) newdecl + sizeof (struct tree_decl_common),
1877 sizeof (struct tree_function_decl) - sizeof (struct tree_decl_common));
1879 /* If newdecl is a template instantiation, it is possible that
1880 the following sequence of events has occurred:
1882 o A friend function was declared in a class template. The
1883 class template was instantiated.
1885 o The instantiation of the friend declaration was
1886 recorded on the instantiation list, and is newdecl.
1888 o Later, however, instantiate_class_template called pushdecl
1889 on the newdecl to perform name injection. But, pushdecl in
1890 turn called duplicate_decls when it discovered that another
1891 declaration of a global function with the same name already
1894 o Here, in duplicate_decls, we decided to clobber newdecl.
1896 If we're going to do that, we'd better make sure that
1897 olddecl, and not newdecl, is on the list of
1898 instantiations so that if we try to do the instantiation
1899 again we won't get the clobbered declaration. */
1900 reregister_specialization (newdecl,
1906 size_t size = tree_code_size (TREE_CODE (olddecl));
1907 memcpy ((char *) olddecl + sizeof (struct tree_common),
1908 (char *) newdecl + sizeof (struct tree_common),
1909 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
1910 switch (TREE_CODE (olddecl))
1920 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
1921 (char *) newdecl + sizeof (struct tree_decl_common),
1922 size - sizeof (struct tree_decl_common)
1923 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
1927 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
1928 (char *) newdecl + sizeof (struct tree_decl_common),
1929 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)
1930 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
1934 DECL_UID (olddecl) = olddecl_uid;
1936 DECL_FRIEND_P (olddecl) = 1;
1939 DECL_ANTICIPATED (olddecl) = 1;
1940 DECL_HIDDEN_FRIEND_P (olddecl) = 1;
1943 /* NEWDECL contains the merged attribute lists.
1944 Update OLDDECL to be the same. */
1945 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
1947 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
1948 so that encode_section_info has a chance to look at the new decl
1949 flags and attributes. */
1950 if (DECL_RTL_SET_P (olddecl)
1951 && (TREE_CODE (olddecl) == FUNCTION_DECL
1952 || (TREE_CODE (olddecl) == VAR_DECL
1953 && TREE_STATIC (olddecl))))
1954 make_decl_rtl (olddecl);
1956 /* The NEWDECL will no longer be needed. Because every out-of-class
1957 declaration of a member results in a call to duplicate_decls,
1958 freeing these nodes represents in a significant savings. */
1964 /* Return zero if the declaration NEWDECL is valid
1965 when the declaration OLDDECL (assumed to be for the same name)
1966 has already been seen.
1967 Otherwise return an error message format string with a %s
1968 where the identifier should go. */
1971 redeclaration_error_message (tree newdecl, tree olddecl)
1973 if (TREE_CODE (newdecl) == TYPE_DECL)
1975 /* Because C++ can put things into name space for free,
1976 constructs like "typedef struct foo { ... } foo"
1977 would look like an erroneous redeclaration. */
1978 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
1981 return "redefinition of %q#D";
1983 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1985 /* If this is a pure function, its olddecl will actually be
1986 the original initialization to `0' (which we force to call
1987 abort()). Don't complain about redefinition in this case. */
1988 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
1989 && DECL_INITIAL (olddecl) == NULL_TREE)
1992 /* If both functions come from different namespaces, this is not
1993 a redeclaration - this is a conflict with a used function. */
1994 if (DECL_NAMESPACE_SCOPE_P (olddecl)
1995 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
1996 && ! decls_match (olddecl, newdecl))
1997 return "%qD conflicts with used function";
1999 /* We'll complain about linkage mismatches in
2000 warn_extern_redeclared_static. */
2002 /* Defining the same name twice is no good. */
2003 if (DECL_INITIAL (olddecl) != NULL_TREE
2004 && DECL_INITIAL (newdecl) != NULL_TREE)
2006 if (DECL_NAME (olddecl) == NULL_TREE)
2007 return "%q#D not declared in class";
2009 return "redefinition of %q#D";
2013 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
2017 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
2019 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
2020 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
2021 return "redefinition of %q#D";
2025 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
2026 || (DECL_TEMPLATE_RESULT (newdecl)
2027 == DECL_TEMPLATE_RESULT (olddecl)))
2030 nt = DECL_TEMPLATE_RESULT (newdecl);
2031 if (DECL_TEMPLATE_INFO (nt))
2032 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
2033 ot = DECL_TEMPLATE_RESULT (olddecl);
2034 if (DECL_TEMPLATE_INFO (ot))
2035 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
2036 if (DECL_INITIAL (nt) && DECL_INITIAL (ot))
2037 return "redefinition of %q#D";
2041 else if (TREE_CODE (newdecl) == VAR_DECL
2042 && DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl))
2044 /* Only variables can be thread-local, and all declarations must
2045 agree on this property. */
2046 if (DECL_THREAD_LOCAL_P (newdecl))
2047 return "thread-local declaration of %q#D follows "
2048 "non-thread-local declaration";
2050 return "non-thread-local declaration of %q#D follows "
2051 "thread-local declaration";
2053 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2055 /* Objects declared at top level: */
2056 /* If at least one is a reference, it's ok. */
2057 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2059 /* Reject two definitions. */
2060 return "redefinition of %q#D";
2064 /* Objects declared with block scope: */
2065 /* Reject two definitions, and reject a definition
2066 together with an external reference. */
2067 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2068 return "redeclaration of %q#D";
2073 /* Create a new label, named ID. */
2076 make_label_decl (tree id, int local_p)
2080 decl = build_decl (LABEL_DECL, id, void_type_node);
2082 DECL_CONTEXT (decl) = current_function_decl;
2083 DECL_MODE (decl) = VOIDmode;
2084 C_DECLARED_LABEL_FLAG (decl) = local_p;
2086 /* Say where one reference is to the label, for the sake of the
2087 error if it is not defined. */
2088 DECL_SOURCE_LOCATION (decl) = input_location;
2090 /* Record the fact that this identifier is bound to this label. */
2091 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2096 /* Record this label on the list of used labels so that we can check
2097 at the end of the function to see whether or not the label was
2098 actually defined, and so we can check when the label is defined whether
2099 this use is valid. */
2102 use_label (tree decl)
2104 if (named_label_uses == NULL
2105 || named_label_uses->names_in_scope != current_binding_level->names
2106 || named_label_uses->label_decl != decl)
2108 struct named_label_use_list *new_ent;
2109 new_ent = GGC_NEW (struct named_label_use_list);
2110 new_ent->label_decl = decl;
2111 new_ent->names_in_scope = current_binding_level->names;
2112 new_ent->binding_level = current_binding_level;
2113 new_ent->o_goto_locus = input_location;
2114 new_ent->next = named_label_uses;
2115 named_label_uses = new_ent;
2119 /* Look for a label named ID in the current function. If one cannot
2120 be found, create one. (We keep track of used, but undefined,
2121 labels, and complain about them at the end of a function.) */
2124 lookup_label (tree id)
2127 struct named_label_list *ent;
2129 timevar_push (TV_NAME_LOOKUP);
2130 /* You can't use labels at global scope. */
2131 if (current_function_decl == NULL_TREE)
2133 error ("label %qE referenced outside of any function", id);
2134 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, NULL_TREE);
2137 /* See if we've already got this label. */
2138 decl = IDENTIFIER_LABEL_VALUE (id);
2139 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2140 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2142 /* Record this label on the list of labels used in this function.
2143 We do this before calling make_label_decl so that we get the
2144 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2145 ent = GGC_CNEW (struct named_label_list);
2146 ent->old_value = IDENTIFIER_LABEL_VALUE (id);
2147 ent->next = named_labels;
2150 /* We need a new label. */
2151 decl = make_label_decl (id, /*local_p=*/0);
2153 /* Now fill in the information we didn't have before. */
2154 ent->label_decl = decl;
2156 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2159 /* Declare a local label named ID. */
2162 declare_local_label (tree id)
2166 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2167 this scope we can restore the old value of
2168 IDENTIFIER_TYPE_VALUE. */
2169 current_binding_level->shadowed_labels
2170 = tree_cons (IDENTIFIER_LABEL_VALUE (id), NULL_TREE,
2171 current_binding_level->shadowed_labels);
2172 /* Look for the label. */
2173 decl = make_label_decl (id, /*local_p=*/1);
2174 /* Now fill in the information we didn't have before. */
2175 TREE_VALUE (current_binding_level->shadowed_labels) = decl;
2180 /* Returns nonzero if it is ill-formed to jump past the declaration of
2181 DECL. Returns 2 if it's also a real problem. */
2184 decl_jump_unsafe (tree decl)
2186 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl)
2187 || TREE_TYPE (decl) == error_mark_node)
2190 if (TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))
2191 || DECL_NONTRIVIALLY_INITIALIZED_P (decl))
2194 if (pod_type_p (TREE_TYPE (decl)))
2197 /* The POD stuff is just pedantry; why should it matter if the class
2198 contains a field of pointer to member type? */
2202 /* Check that a single previously seen jump to a newly defined label
2203 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2204 the jump context; NAMES are the names in scope in LEVEL at the jump
2205 context; FILE and LINE are the source position of the jump or 0. */
2208 check_previous_goto_1 (tree decl,
2209 struct cp_binding_level* level,
2210 tree names, const location_t *locus)
2214 struct cp_binding_level *b = current_binding_level;
2215 for (; b; b = b->level_chain)
2217 tree new_decls = b->names;
2218 tree old_decls = (b == level ? names : NULL_TREE);
2219 for (; new_decls != old_decls;
2220 new_decls = TREE_CHAIN (new_decls))
2222 int problem = decl_jump_unsafe (new_decls);
2229 pedwarn ("jump to label %qD", decl);
2231 pedwarn ("jump to case label");
2234 pedwarn ("%H from here", locus);
2239 error (" crosses initialization of %q+#D", new_decls);
2241 pedwarn (" enters scope of non-POD %q+#D", new_decls);
2246 if ((b->kind == sk_try || b->kind == sk_catch) && ! saw_eh)
2251 pedwarn ("jump to label %qD", decl);
2253 pedwarn ("jump to case label");
2256 pedwarn ("%H from here", locus);
2259 if (b->kind == sk_try)
2260 error (" enters try block");
2262 error (" enters catch block");
2269 check_previous_goto (struct named_label_use_list* use)
2271 check_previous_goto_1 (use->label_decl, use->binding_level,
2272 use->names_in_scope, &use->o_goto_locus);
2276 check_switch_goto (struct cp_binding_level* level)
2278 check_previous_goto_1 (NULL_TREE, level, level->names, NULL);
2281 /* Check that any previously seen jumps to a newly defined label DECL
2282 are OK. Called by define_label. */
2285 check_previous_gotos (tree decl)
2287 struct named_label_use_list **usep;
2289 if (! TREE_USED (decl))
2292 for (usep = &named_label_uses; *usep; )
2294 struct named_label_use_list *use = *usep;
2295 if (use->label_decl == decl)
2297 check_previous_goto (use);
2301 usep = &(use->next);
2305 /* Check that a new jump to a label DECL is OK. Called by
2306 finish_goto_stmt. */
2309 check_goto (tree decl)
2313 struct named_label_list *lab;
2315 /* We can't know where a computed goto is jumping. So we assume
2317 if (! DECL_P (decl))
2320 /* If the label hasn't been defined yet, defer checking. */
2321 if (! DECL_INITIAL (decl))
2327 for (lab = named_labels; lab; lab = lab->next)
2328 if (decl == lab->label_decl)
2331 /* If the label is not on named_labels it's a gcc local label, so
2332 it must be in an outer scope, so jumping to it is always OK. */
2336 if ((lab->in_try_scope || lab->in_catch_scope || lab->bad_decls)
2339 pedwarn ("jump to label %q+D", decl);
2340 pedwarn (" from here");
2344 for (bad = lab->bad_decls; bad; bad = TREE_CHAIN (bad))
2346 tree b = TREE_VALUE (bad);
2347 int u = decl_jump_unsafe (b);
2349 if (u > 1 && DECL_ARTIFICIAL (b))
2350 /* Can't skip init of __exception_info. */
2351 error ("%J enters catch block", b);
2353 error (" skips initialization of %q+#D", b);
2355 pedwarn (" enters scope of non-POD %q+#D", b);
2358 if (lab->in_try_scope)
2359 error (" enters try block");
2360 else if (lab->in_catch_scope)
2361 error (" enters catch block");
2364 /* Define a label, specifying the location in the source file.
2365 Return the LABEL_DECL node for the label. */
2368 define_label (location_t location, tree name)
2370 tree decl = lookup_label (name);
2371 struct named_label_list *ent;
2372 struct cp_binding_level *p;
2374 timevar_push (TV_NAME_LOOKUP);
2375 for (ent = named_labels; ent; ent = ent->next)
2376 if (ent->label_decl == decl)
2379 /* After labels, make any new cleanups in the function go into their
2380 own new (temporary) binding contour. */
2381 for (p = current_binding_level;
2382 p->kind != sk_function_parms;
2384 p->more_cleanups_ok = 0;
2386 if (name == get_identifier ("wchar_t"))
2387 pedwarn ("label named wchar_t");
2389 if (DECL_INITIAL (decl) != NULL_TREE)
2390 error ("duplicate label %qD", decl);
2393 /* Mark label as having been defined. */
2394 DECL_INITIAL (decl) = error_mark_node;
2395 /* Say where in the source. */
2396 DECL_SOURCE_LOCATION (decl) = location;
2399 ent->names_in_scope = current_binding_level->names;
2400 ent->binding_level = current_binding_level;
2402 check_previous_gotos (decl);
2405 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2410 struct cp_binding_level *level;
2411 struct cp_switch *next;
2412 /* The SWITCH_STMT being built. */
2414 /* A splay-tree mapping the low element of a case range to the high
2415 element, or NULL_TREE if there is no high element. Used to
2416 determine whether or not a new case label duplicates an old case
2417 label. We need a tree, rather than simply a hash table, because
2418 of the GNU case range extension. */
2422 /* A stack of the currently active switch statements. The innermost
2423 switch statement is on the top of the stack. There is no need to
2424 mark the stack for garbage collection because it is only active
2425 during the processing of the body of a function, and we never
2426 collect at that point. */
2428 static struct cp_switch *switch_stack;
2430 /* Called right after a switch-statement condition is parsed.
2431 SWITCH_STMT is the switch statement being parsed. */
2434 push_switch (tree switch_stmt)
2436 struct cp_switch *p = XNEW (struct cp_switch);
2437 p->level = current_binding_level;
2438 p->next = switch_stack;
2439 p->switch_stmt = switch_stmt;
2440 p->cases = splay_tree_new (case_compare, NULL, NULL);
2447 struct cp_switch *cs = switch_stack;
2448 location_t switch_location;
2450 /* Emit warnings as needed. */
2451 if (EXPR_HAS_LOCATION (cs->switch_stmt))
2452 switch_location = EXPR_LOCATION (cs->switch_stmt);
2454 switch_location = input_location;
2455 if (!processing_template_decl)
2456 c_do_switch_warnings (cs->cases, switch_location,
2457 SWITCH_STMT_TYPE (cs->switch_stmt),
2458 SWITCH_STMT_COND (cs->switch_stmt));
2460 splay_tree_delete (cs->cases);
2461 switch_stack = switch_stack->next;
2465 /* Note that we've seen a definition of a case label, and complain if this
2466 is a bad place for one. */
2469 finish_case_label (tree low_value, tree high_value)
2472 struct cp_binding_level *p;
2474 if (processing_template_decl)
2478 /* For templates, just add the case label; we'll do semantic
2479 analysis at instantiation-time. */
2480 label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
2481 return add_stmt (build_case_label (low_value, high_value, label));
2484 /* Find the condition on which this switch statement depends. */
2485 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
2486 if (cond && TREE_CODE (cond) == TREE_LIST)
2487 cond = TREE_VALUE (cond);
2489 r = c_add_case_label (switch_stack->cases, cond, TREE_TYPE (cond),
2490 low_value, high_value);
2492 check_switch_goto (switch_stack->level);
2494 /* After labels, make any new cleanups in the function go into their
2495 own new (temporary) binding contour. */
2496 for (p = current_binding_level;
2497 p->kind != sk_function_parms;
2499 p->more_cleanups_ok = 0;
2504 /* Hash a TYPENAME_TYPE. K is really of type `tree'. */
2507 typename_hash (const void* k)
2512 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
2513 ^ htab_hash_pointer (DECL_NAME (TYPE_NAME (t))));
2518 typedef struct typename_info {
2526 /* Compare two TYPENAME_TYPEs. K1 and K2 are really of type `tree'. */
2529 typename_compare (const void * k1, const void * k2)
2532 const typename_info *t2;
2535 t2 = (const typename_info *) k2;
2537 return (DECL_NAME (TYPE_NAME (t1)) == t2->name
2538 && TYPE_CONTEXT (t1) == t2->scope
2539 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
2540 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
2541 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
2544 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
2545 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
2547 Returns the new TYPENAME_TYPE. */
2549 static GTY ((param_is (union tree_node))) htab_t typename_htab;
2552 build_typename_type (tree context, tree name, tree fullname,
2553 enum tag_types tag_type)
2561 if (typename_htab == NULL)
2562 typename_htab = htab_create_ggc (61, &typename_hash,
2563 &typename_compare, NULL);
2565 ti.scope = FROB_CONTEXT (context);
2567 ti.template_id = fullname;
2568 ti.enum_p = tag_type == enum_type;
2569 ti.class_p = (tag_type == class_type
2570 || tag_type == record_type
2571 || tag_type == union_type);
2572 hash = (htab_hash_pointer (ti.scope)
2573 ^ htab_hash_pointer (ti.name));
2575 /* See if we already have this type. */
2576 e = htab_find_slot_with_hash (typename_htab, &ti, hash, INSERT);
2581 /* Build the TYPENAME_TYPE. */
2582 t = make_aggr_type (TYPENAME_TYPE);
2583 TYPE_CONTEXT (t) = ti.scope;
2584 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
2585 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
2586 TYPENAME_IS_CLASS_P (t) = ti.class_p;
2588 /* Build the corresponding TYPE_DECL. */
2589 d = build_decl (TYPE_DECL, name, t);
2590 TYPE_NAME (TREE_TYPE (d)) = d;
2591 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
2592 DECL_CONTEXT (d) = FROB_CONTEXT (context);
2593 DECL_ARTIFICIAL (d) = 1;
2595 /* Store it in the hash table. */
2602 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
2603 provided to name the type. Returns an appropriate type, unless an
2604 error occurs, in which case error_mark_node is returned. If we
2605 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
2606 return that, rather than the _TYPE it corresponds to, in other
2607 cases we look through the type decl. If TF_ERROR is set, complain
2608 about errors, otherwise be quiet. */
2611 make_typename_type (tree context, tree name, enum tag_types tag_type,
2612 tsubst_flags_t complain)
2616 if (name == error_mark_node
2617 || context == NULL_TREE
2618 || context == error_mark_node)
2619 return error_mark_node;
2623 if (!(TYPE_LANG_SPECIFIC (name)
2624 && (CLASSTYPE_IS_TEMPLATE (name)
2625 || CLASSTYPE_USE_TEMPLATE (name))))
2626 name = TYPE_IDENTIFIER (name);
2628 /* Create a TEMPLATE_ID_EXPR for the type. */
2629 name = build_nt (TEMPLATE_ID_EXPR,
2630 CLASSTYPE_TI_TEMPLATE (name),
2631 CLASSTYPE_TI_ARGS (name));
2633 else if (TREE_CODE (name) == TYPE_DECL)
2634 name = DECL_NAME (name);
2638 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
2640 name = TREE_OPERAND (name, 0);
2641 if (TREE_CODE (name) == TEMPLATE_DECL)
2642 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
2644 if (TREE_CODE (name) == TEMPLATE_DECL)
2646 error ("%qD used without template parameters", name);
2647 return error_mark_node;
2649 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
2650 gcc_assert (TYPE_P (context));
2652 if (!dependent_type_p (context)
2653 || currently_open_class (context))
2655 if (TREE_CODE (fullname) == TEMPLATE_ID_EXPR)
2657 tree tmpl = NULL_TREE;
2658 if (IS_AGGR_TYPE (context))
2659 tmpl = lookup_field (context, name, 0, false);
2660 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
2662 if (complain & tf_error)
2663 error ("no class template named %q#T in %q#T",
2665 return error_mark_node;
2668 if (complain & tf_error)
2669 perform_or_defer_access_check (TYPE_BINFO (context), tmpl);
2671 return lookup_template_class (tmpl,
2672 TREE_OPERAND (fullname, 1),
2674 /*entering_scope=*/0,
2675 tf_warning_or_error | tf_user);
2681 if (!IS_AGGR_TYPE (context))
2683 if (complain & tf_error)
2684 error ("no type named %q#T in %q#T", name, context);
2685 return error_mark_node;
2688 t = lookup_field (context, name, 0, true);
2691 if (TREE_CODE (t) != TYPE_DECL)
2693 if (complain & tf_error)
2694 error ("no type named %q#T in %q#T", name, context);
2695 return error_mark_node;
2698 if (complain & tf_error)
2699 perform_or_defer_access_check (TYPE_BINFO (context), t);
2701 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
2709 /* If the CONTEXT is not a template type, then either the field is
2710 there now or its never going to be. */
2711 if (!dependent_type_p (context))
2713 if (complain & tf_error)
2714 error ("no type named %q#T in %q#T", name, context);
2715 return error_mark_node;
2718 return build_typename_type (context, name, fullname, tag_type);
2721 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
2722 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
2723 in which case error_mark_node is returned.
2725 If PARM_LIST is non-NULL, also make sure that the template parameter
2726 list of TEMPLATE_DECL matches.
2728 If COMPLAIN zero, don't complain about any errors that occur. */
2731 make_unbound_class_template (tree context, tree name, tree parm_list,
2732 tsubst_flags_t complain)
2738 name = TYPE_IDENTIFIER (name);
2739 else if (DECL_P (name))
2740 name = DECL_NAME (name);
2741 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
2743 if (!dependent_type_p (context)
2744 || currently_open_class (context))
2746 tree tmpl = NULL_TREE;
2748 if (IS_AGGR_TYPE (context))
2749 tmpl = lookup_field (context, name, 0, false);
2751 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
2753 if (complain & tf_error)
2754 error ("no class template named %q#T in %q#T", name, context);
2755 return error_mark_node;
2759 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
2761 if (complain & tf_error)
2763 error ("template parameters do not match template");
2764 error ("%q+D declared here", tmpl);
2766 return error_mark_node;
2769 if (complain & tf_error)
2770 perform_or_defer_access_check (TYPE_BINFO (context), tmpl);
2775 /* Build the UNBOUND_CLASS_TEMPLATE. */
2776 t = make_aggr_type (UNBOUND_CLASS_TEMPLATE);
2777 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
2778 TREE_TYPE (t) = NULL_TREE;
2780 /* Build the corresponding TEMPLATE_DECL. */
2781 d = build_decl (TEMPLATE_DECL, name, t);
2782 TYPE_NAME (TREE_TYPE (d)) = d;
2783 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
2784 DECL_CONTEXT (d) = FROB_CONTEXT (context);
2785 DECL_ARTIFICIAL (d) = 1;
2786 DECL_TEMPLATE_PARMS (d) = parm_list;
2793 /* Push the declarations of builtin types into the namespace.
2794 RID_INDEX is the index of the builtin type in the array
2795 RID_POINTERS. NAME is the name used when looking up the builtin
2796 type. TYPE is the _TYPE node for the builtin type. */
2799 record_builtin_type (enum rid rid_index,
2803 tree rname = NULL_TREE, tname = NULL_TREE;
2804 tree tdecl = NULL_TREE;
2806 if ((int) rid_index < (int) RID_MAX)
2807 rname = ridpointers[(int) rid_index];
2809 tname = get_identifier (name);
2811 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
2812 eliminated. Built-in types should not be looked up name; their
2813 names are keywords that the parser can recognize. However, there
2814 is code in c-common.c that uses identifier_global_value to look
2815 up built-in types by name. */
2818 tdecl = build_decl (TYPE_DECL, tname, type);
2819 DECL_ARTIFICIAL (tdecl) = 1;
2820 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
2826 tdecl = build_decl (TYPE_DECL, rname, type);
2827 DECL_ARTIFICIAL (tdecl) = 1;
2829 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
2832 if (!TYPE_NAME (type))
2833 TYPE_NAME (type) = tdecl;
2836 debug_hooks->type_decl (tdecl, 0);
2839 /* Record one of the standard Java types.
2840 * Declare it as having the given NAME.
2841 * If SIZE > 0, it is the size of one of the integral types;
2842 * otherwise it is the negative of the size of one of the other types. */
2845 record_builtin_java_type (const char* name, int size)
2849 type = make_signed_type (size);
2850 else if (size > -32)
2851 { /* "__java_char" or ""__java_boolean". */
2852 type = make_unsigned_type (-size);
2853 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
2856 { /* "__java_float" or ""__java_double". */
2857 type = make_node (REAL_TYPE);
2858 TYPE_PRECISION (type) = - size;
2861 record_builtin_type (RID_MAX, name, type);
2862 decl = TYPE_NAME (type);
2864 /* Suppress generate debug symbol entries for these types,
2865 since for normal C++ they are just clutter.
2866 However, push_lang_context undoes this if extern "Java" is seen. */
2867 DECL_IGNORED_P (decl) = 1;
2869 TYPE_FOR_JAVA (type) = 1;
2873 /* Push a type into the namespace so that the back-ends ignore it. */
2876 record_unknown_type (tree type, const char* name)
2878 tree decl = pushdecl (build_decl (TYPE_DECL, get_identifier (name), type));
2879 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
2880 DECL_IGNORED_P (decl) = 1;
2881 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
2882 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
2883 TYPE_ALIGN (type) = 1;
2884 TYPE_USER_ALIGN (type) = 0;
2885 TYPE_MODE (type) = TYPE_MODE (void_type_node);
2888 /* A string for which we should create an IDENTIFIER_NODE at
2891 typedef struct predefined_identifier
2893 /* The name of the identifier. */
2894 const char *const name;
2895 /* The place where the IDENTIFIER_NODE should be stored. */
2897 /* Nonzero if this is the name of a constructor or destructor. */
2898 const int ctor_or_dtor_p;
2899 } predefined_identifier;
2901 /* Create all the predefined identifiers. */
2904 initialize_predefined_identifiers (void)
2906 const predefined_identifier *pid;
2908 /* A table of identifiers to create at startup. */
2909 static const predefined_identifier predefined_identifiers[] = {
2910 { "C++", &lang_name_cplusplus, 0 },
2911 { "C", &lang_name_c, 0 },
2912 { "Java", &lang_name_java, 0 },
2913 /* Some of these names have a trailing space so that it is
2914 impossible for them to conflict with names written by users. */
2915 { "__ct ", &ctor_identifier, 1 },
2916 { "__base_ctor ", &base_ctor_identifier, 1 },
2917 { "__comp_ctor ", &complete_ctor_identifier, 1 },
2918 { "__dt ", &dtor_identifier, 1 },
2919 { "__comp_dtor ", &complete_dtor_identifier, 1 },
2920 { "__base_dtor ", &base_dtor_identifier, 1 },
2921 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
2922 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
2923 { "nelts", &nelts_identifier, 0 },
2924 { THIS_NAME, &this_identifier, 0 },
2925 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
2926 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
2927 { "_vptr", &vptr_identifier, 0 },
2928 { "__vtt_parm", &vtt_parm_identifier, 0 },
2929 { "::", &global_scope_name, 0 },
2930 { "std", &std_identifier, 0 },
2934 for (pid = predefined_identifiers; pid->name; ++pid)
2936 *pid->node = get_identifier (pid->name);
2937 if (pid->ctor_or_dtor_p)
2938 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
2942 /* Create the predefined scalar types of C,
2943 and some nodes representing standard constants (0, 1, (void *)0).
2944 Initialize the global binding level.
2945 Make definitions for built-in primitive functions. */
2948 cxx_init_decl_processing (void)
2951 tree void_ftype_ptr;
2953 build_common_tree_nodes (flag_signed_char, false);
2955 /* Create all the identifiers we need. */
2956 initialize_predefined_identifiers ();
2958 /* Create the global variables. */
2959 push_to_top_level ();
2961 current_function_decl = NULL_TREE;
2962 current_binding_level = NULL;
2963 /* Enter the global namespace. */
2964 gcc_assert (global_namespace == NULL_TREE);
2965 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
2967 begin_scope (sk_namespace, global_namespace);
2969 current_lang_name = NULL_TREE;
2971 /* Adjust various flags based on command-line settings. */
2972 if (!flag_permissive)
2973 flag_pedantic_errors = 1;
2974 if (!flag_no_inline)
2976 flag_inline_trees = 1;
2979 if (flag_inline_functions)
2980 flag_inline_trees = 2;
2982 /* Force minimum function alignment if using the least significant
2983 bit of function pointers to store the virtual bit. */
2984 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
2985 && force_align_functions_log < 1)
2986 force_align_functions_log = 1;
2989 current_lang_name = lang_name_c;
2991 error_mark_list = build_tree_list (error_mark_node, error_mark_node);
2992 TREE_TYPE (error_mark_list) = error_mark_node;
2994 /* Create the `std' namespace. */
2995 push_namespace (std_identifier);
2996 std_node = current_namespace;
2999 c_common_nodes_and_builtins ();
3001 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
3002 java_short_type_node = record_builtin_java_type ("__java_short", 16);
3003 java_int_type_node = record_builtin_java_type ("__java_int", 32);
3004 java_long_type_node = record_builtin_java_type ("__java_long", 64);
3005 java_float_type_node = record_builtin_java_type ("__java_float", -32);
3006 java_double_type_node = record_builtin_java_type ("__java_double", -64);
3007 java_char_type_node = record_builtin_java_type ("__java_char", -16);
3008 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
3010 integer_two_node = build_int_cst (NULL_TREE, 2);
3011 integer_three_node = build_int_cst (NULL_TREE, 3);
3013 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
3014 truthvalue_type_node = boolean_type_node;
3015 truthvalue_false_node = boolean_false_node;
3016 truthvalue_true_node = boolean_true_node;
3018 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
3021 record_builtin_type (RID_MAX, NULL, string_type_node);
3024 delta_type_node = ptrdiff_type_node;
3025 vtable_index_type = ptrdiff_type_node;
3027 vtt_parm_type = build_pointer_type (const_ptr_type_node);
3028 void_ftype = build_function_type (void_type_node, void_list_node);
3029 void_ftype_ptr = build_function_type (void_type_node,
3030 tree_cons (NULL_TREE,
3034 = build_exception_variant (void_ftype_ptr, empty_except_spec);
3036 /* C++ extensions */
3038 unknown_type_node = make_node (UNKNOWN_TYPE);
3039 record_unknown_type (unknown_type_node, "unknown type");
3041 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3042 TREE_TYPE (unknown_type_node) = unknown_type_node;
3044 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3046 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
3047 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
3050 /* Make sure we get a unique function type, so we can give
3051 its pointer type a name. (This wins for gdb.) */
3052 tree vfunc_type = make_node (FUNCTION_TYPE);
3053 TREE_TYPE (vfunc_type) = integer_type_node;
3054 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
3055 layout_type (vfunc_type);
3057 vtable_entry_type = build_pointer_type (vfunc_type);
3059 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
3062 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
3063 layout_type (vtbl_type_node);
3064 vtbl_type_node = build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
3065 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
3066 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
3067 layout_type (vtbl_ptr_type_node);
3068 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
3070 push_namespace (get_identifier ("__cxxabiv1"));
3071 abi_node = current_namespace;
3074 global_type_node = make_node (LANG_TYPE);
3075 record_unknown_type (global_type_node, "global type");
3078 current_lang_name = lang_name_cplusplus;
3082 tree bad_alloc_type_node;
3083 tree bad_alloc_decl;
3084 tree newtype, deltype;
3085 tree ptr_ftype_sizetype;
3087 push_namespace (std_identifier);
3088 bad_alloc_id = get_identifier ("bad_alloc");
3089 bad_alloc_type_node = make_aggr_type (RECORD_TYPE);
3090 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3092 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3093 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3094 TYPE_STUB_DECL (bad_alloc_type_node) = bad_alloc_decl;
3098 = build_function_type (ptr_type_node,
3099 tree_cons (NULL_TREE,
3102 newtype = build_exception_variant
3103 (ptr_ftype_sizetype, add_exception_specifier
3104 (NULL_TREE, bad_alloc_type_node, -1));
3105 deltype = build_exception_variant (void_ftype_ptr, empty_except_spec);
3106 push_cp_library_fn (NEW_EXPR, newtype);
3107 push_cp_library_fn (VEC_NEW_EXPR, newtype);
3108 global_delete_fndecl = push_cp_library_fn (DELETE_EXPR, deltype);
3109 push_cp_library_fn (VEC_DELETE_EXPR, deltype);
3113 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype);
3115 /* Perform other language dependent initializations. */
3116 init_class_processing ();
3117 init_rtti_processing ();
3119 if (flag_exceptions)
3120 init_exception_processing ();
3122 if (! supports_one_only ())
3125 make_fname_decl = cp_make_fname_decl;
3126 start_fname_decls ();
3128 /* Show we use EH for cleanups. */
3129 if (flag_exceptions)
3130 using_eh_for_cleanups ();
3133 /* Generate an initializer for a function naming variable from
3134 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
3135 filled in with the type of the init. */
3138 cp_fname_init (const char* name, tree *type_p)
3140 tree domain = NULL_TREE;
3142 tree init = NULL_TREE;
3147 length = strlen (name);
3148 domain = build_index_type (size_int (length));
3149 init = build_string (length + 1, name);
3152 type = build_qualified_type (char_type_node, TYPE_QUAL_CONST);
3153 type = build_cplus_array_type (type, domain);
3158 TREE_TYPE (init) = type;
3160 init = error_mark_node;
3165 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
3166 decl, NAME is the initialization string and TYPE_DEP indicates whether
3167 NAME depended on the type of the function. We make use of that to detect
3168 __PRETTY_FUNCTION__ inside a template fn. This is being done
3169 lazily at the point of first use, so we mustn't push the decl now. */
3172 cp_make_fname_decl (tree id, int type_dep)
3174 const char *const name = (type_dep && processing_template_decl
3175 ? NULL : fname_as_string (type_dep));
3177 tree init = cp_fname_init (name, &type);
3178 tree decl = build_decl (VAR_DECL, id, type);
3181 free ((char *) name);
3183 /* As we're using pushdecl_with_scope, we must set the context. */
3184 DECL_CONTEXT (decl) = current_function_decl;
3185 DECL_PRETTY_FUNCTION_P (decl) = type_dep;
3187 TREE_STATIC (decl) = 1;
3188 TREE_READONLY (decl) = 1;
3189 DECL_ARTIFICIAL (decl) = 1;
3190 DECL_INITIAL (decl) = init;
3192 TREE_USED (decl) = 1;
3194 if (current_function_decl)
3196 struct cp_binding_level *b = current_binding_level;
3197 while (b->level_chain->kind != sk_function_parms)
3199 pushdecl_with_scope (decl, b, /*is_friend=*/false);
3200 cp_finish_decl (decl, init, NULL_TREE, LOOKUP_ONLYCONVERTING);
3203 pushdecl_top_level_and_finish (decl, init);
3208 /* Make a definition for a builtin function named NAME in the current
3209 namespace, whose data type is TYPE and whose context is CONTEXT.
3210 TYPE should be a function type with argument types.
3212 CLASS and CODE tell later passes how to compile calls to this function.
3213 See tree.h for possible values.
3215 If LIBNAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3216 the name to be called if we can't opencode the function.
3217 If ATTRS is nonzero, use that for the function's attribute
3221 builtin_function_1 (const char* name,
3224 enum built_in_function code,
3225 enum built_in_class class,
3226 const char* libname,
3229 tree decl = build_library_fn_1 (get_identifier (name), ERROR_MARK, type);
3230 DECL_BUILT_IN_CLASS (decl) = class;
3231 DECL_FUNCTION_CODE (decl) = code;
3232 DECL_CONTEXT (decl) = context;
3236 /* Since `pushdecl' relies on DECL_ASSEMBLER_NAME instead of DECL_NAME,
3237 we cannot change DECL_ASSEMBLER_NAME until we have installed this
3238 function in the namespace. */
3240 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (libname));
3242 /* A function in the user's namespace should have an explicit
3243 declaration before it is used. Mark the built-in function as
3244 anticipated but not actually declared. */
3245 if (name[0] != '_' || name[1] != '_')
3246 DECL_ANTICIPATED (decl) = 1;
3248 /* Possibly apply some default attributes to this built-in function. */
3250 decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
3252 decl_attributes (&decl, NULL_TREE, 0);
3257 /* Entry point for the benefit of c_common_nodes_and_builtins.
3259 Make a definition for a builtin function named NAME and whose data type
3260 is TYPE. TYPE should be a function type with argument types. This
3261 function places the anticipated declaration in the global namespace
3262 and additionally in the std namespace if appropriate.
3264 CLASS and CODE tell later passes how to compile calls to this function.
3265 See tree.h for possible values.
3267 If LIBNAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3268 the name to be called if we can't opencode the function.
3270 If ATTRS is nonzero, use that for the function's attribute
3274 builtin_function (const char* name,
3277 enum built_in_class cl,
3278 const char* libname,
3281 /* All builtins that don't begin with an '_' should additionally
3282 go in the 'std' namespace. */
3285 push_namespace (std_identifier);
3286 builtin_function_1 (name, type, std_node, code, cl, libname, attrs);
3290 return builtin_function_1 (name, type, NULL_TREE, code,
3291 cl, libname, attrs);
3294 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
3295 function. Not called directly. */
3298 build_library_fn_1 (tree name, enum tree_code operator_code, tree type)
3300 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
3301 DECL_EXTERNAL (fn) = 1;
3302 TREE_PUBLIC (fn) = 1;
3303 DECL_ARTIFICIAL (fn) = 1;
3304 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
3305 SET_DECL_LANGUAGE (fn, lang_c);
3306 /* Runtime library routines are, by definition, available in an
3307 external shared object. */
3308 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
3309 DECL_VISIBILITY_SPECIFIED (fn) = 1;
3313 /* Returns the _DECL for a library function with C linkage.
3314 We assume that such functions never throw; if this is incorrect,
3315 callers should unset TREE_NOTHROW. */
3318 build_library_fn (tree name, tree type)
3320 tree fn = build_library_fn_1 (name, ERROR_MARK, type);
3321 TREE_NOTHROW (fn) = 1;
3325 /* Returns the _DECL for a library function with C++ linkage. */
3328 build_cp_library_fn (tree name, enum tree_code operator_code, tree type)
3330 tree fn = build_library_fn_1 (name, operator_code, type);
3331 TREE_NOTHROW (fn) = TYPE_NOTHROW_P (type);
3332 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
3333 SET_DECL_LANGUAGE (fn, lang_cplusplus);
3337 /* Like build_library_fn, but takes a C string instead of an
3341 build_library_fn_ptr (const char* name, tree type)
3343 return build_library_fn (get_identifier (name), type);
3346 /* Like build_cp_library_fn, but takes a C string instead of an
3350 build_cp_library_fn_ptr (const char* name, tree type)
3352 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type);
3355 /* Like build_library_fn, but also pushes the function so that we will
3356 be able to find it via IDENTIFIER_GLOBAL_VALUE. */
3359 push_library_fn (tree name, tree type)
3361 tree fn = build_library_fn (name, type);
3362 pushdecl_top_level (fn);
3366 /* Like build_cp_library_fn, but also pushes the function so that it
3367 will be found by normal lookup. */
3370 push_cp_library_fn (enum tree_code operator_code, tree type)
3372 tree fn = build_cp_library_fn (ansi_opname (operator_code),
3379 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
3383 push_void_library_fn (tree name, tree parmtypes)
3385 tree type = build_function_type (void_type_node, parmtypes);
3386 return push_library_fn (name, type);
3389 /* Like push_library_fn, but also note that this function throws
3390 and does not return. Used for __throw_foo and the like. */
3393 push_throw_library_fn (tree name, tree type)
3395 tree fn = push_library_fn (name, type);
3396 TREE_THIS_VOLATILE (fn) = 1;
3397 TREE_NOTHROW (fn) = 0;
3401 /* When we call finish_struct for an anonymous union, we create
3402 default copy constructors and such. But, an anonymous union
3403 shouldn't have such things; this function undoes the damage to the
3404 anonymous union type T.
3406 (The reason that we create the synthesized methods is that we don't
3407 distinguish `union { int i; }' from `typedef union { int i; } U'.
3408 The first is an anonymous union; the second is just an ordinary
3412 fixup_anonymous_aggr (tree t)
3416 /* Wipe out memory of synthesized methods. */
3417 TYPE_HAS_CONSTRUCTOR (t) = 0;
3418 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
3419 TYPE_HAS_INIT_REF (t) = 0;
3420 TYPE_HAS_CONST_INIT_REF (t) = 0;
3421 TYPE_HAS_ASSIGN_REF (t) = 0;
3422 TYPE_HAS_CONST_ASSIGN_REF (t) = 0;
3424 /* Splice the implicitly generated functions out of the TYPE_METHODS
3426 q = &TYPE_METHODS (t);
3429 if (DECL_ARTIFICIAL (*q))
3430 *q = TREE_CHAIN (*q);
3432 q = &TREE_CHAIN (*q);
3435 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
3436 if (TYPE_METHODS (t))
3437 error ("%Jan anonymous union cannot have function members",
3438 TYPE_MAIN_DECL (t));
3440 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
3441 assignment operators (because they cannot have these methods themselves).
3442 For anonymous unions this is already checked because they are not allowed
3443 in any union, otherwise we have to check it. */
3444 if (TREE_CODE (t) != UNION_TYPE)
3448 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
3449 if (TREE_CODE (field) == FIELD_DECL)
3451 type = TREE_TYPE (field);
3452 if (CLASS_TYPE_P (type))
3454 if (TYPE_NEEDS_CONSTRUCTING (type))
3455 error ("member %q+#D with constructor not allowed "
3456 "in anonymous aggregate", field);
3457 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
3458 error ("member %q+#D with destructor not allowed "
3459 "in anonymous aggregate", field);
3460 if (TYPE_HAS_COMPLEX_ASSIGN_REF (type))
3461 error ("member %q+#D with copy assignment operator "
3462 "not allowed in anonymous aggregate", field);
3468 /* Make sure that a declaration with no declarator is well-formed, i.e.
3469 just declares a tagged type or anonymous union.
3471 Returns the type declared; or NULL_TREE if none. */
3474 check_tag_decl (cp_decl_specifier_seq *declspecs)
3476 int saw_friend = declspecs->specs[(int)ds_friend] != 0;
3477 int saw_typedef = declspecs->specs[(int)ds_typedef] != 0;
3478 /* If a class, struct, or enum type is declared by the DECLSPECS
3479 (i.e, if a class-specifier, enum-specifier, or non-typename
3480 elaborated-type-specifier appears in the DECLSPECS),
3481 DECLARED_TYPE is set to the corresponding type. */
3482 tree declared_type = NULL_TREE;
3483 bool error_p = false;
3485 if (declspecs->multiple_types_p)
3486 error ("multiple types in one declaration");
3487 else if (declspecs->redefined_builtin_type)
3489 if (!in_system_header)
3490 pedwarn ("redeclaration of C++ built-in type %qT",
3491 declspecs->redefined_builtin_type);
3496 && TYPE_P (declspecs->type)
3497 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
3498 && IS_AGGR_TYPE (declspecs->type))
3499 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
3500 declared_type = declspecs->type;
3501 else if (declspecs->type == error_mark_node)
3503 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
3504 pedwarn ("declaration does not declare anything");
3505 /* Check for an anonymous union. */
3506 else if (declared_type && IS_AGGR_TYPE_CODE (TREE_CODE (declared_type))
3507 && TYPE_ANONYMOUS_P (declared_type))
3509 /* 7/3 In a simple-declaration, the optional init-declarator-list
3510 can be omitted only when declaring a class (clause 9) or
3511 enumeration (7.2), that is, when the decl-specifier-seq contains
3512 either a class-specifier, an elaborated-type-specifier with
3513 a class-key (9.1), or an enum-specifier. In these cases and
3514 whenever a class-specifier or enum-specifier is present in the
3515 decl-specifier-seq, the identifiers in these specifiers are among
3516 the names being declared by the declaration (as class-name,
3517 enum-names, or enumerators, depending on the syntax). In such
3518 cases, and except for the declaration of an unnamed bit-field (9.6),
3519 the decl-specifier-seq shall introduce one or more names into the
3520 program, or shall redeclare a name introduced by a previous
3521 declaration. [Example:
3522 enum { }; // ill-formed
3523 typedef class { }; // ill-formed
3527 error ("missing type-name in typedef-declaration");
3530 /* Anonymous unions are objects, so they can have specifiers. */;
3531 SET_ANON_AGGR_TYPE_P (declared_type);
3533 if (TREE_CODE (declared_type) != UNION_TYPE && pedantic
3534 && !in_system_header)
3535 pedwarn ("ISO C++ prohibits anonymous structs");
3540 if (declspecs->specs[(int)ds_inline]
3541 || declspecs->specs[(int)ds_virtual])
3542 error ("%qs can only be specified for functions",
3543 declspecs->specs[(int)ds_inline]
3544 ? "inline" : "virtual");
3546 && (!current_class_type
3547 || current_scope () != current_class_type))
3548 error ("%<friend%> can only be specified inside a class");
3549 else if (declspecs->specs[(int)ds_explicit])
3550 error ("%<explicit%> can only be specified for constructors");
3551 else if (declspecs->storage_class)
3552 error ("a storage class can only be specified for objects "
3554 else if (declspecs->specs[(int)ds_const]
3555 || declspecs->specs[(int)ds_volatile]
3556 || declspecs->specs[(int)ds_restrict]
3557 || declspecs->specs[(int)ds_thread])
3558 error ("qualifiers can only be specified for objects "
3562 return declared_type;
3565 /* Called when a declaration is seen that contains no names to declare.
3566 If its type is a reference to a structure, union or enum inherited
3567 from a containing scope, shadow that tag name for the current scope
3568 with a forward reference.
3569 If its type defines a new named structure or union
3570 or defines an enum, it is valid but we need not do anything here.
3571 Otherwise, it is an error.
3573 C++: may have to grok the declspecs to learn about static,
3574 complain for anonymous unions.
3576 Returns the TYPE declared -- or NULL_TREE if none. */
3579 shadow_tag (cp_decl_specifier_seq *declspecs)
3581 tree t = check_tag_decl (declspecs);
3586 if (declspecs->attributes)
3588 warning (0, "attribute ignored in declaration of %q+#T", t);
3589 warning (0, "attribute for %q+#T must follow the %qs keyword",
3590 t, class_key_or_enum_as_string (t));
3594 maybe_process_partial_specialization (t);
3596 /* This is where the variables in an anonymous union are
3597 declared. An anonymous union declaration looks like:
3599 because there is no declarator after the union, the parser
3600 sends that declaration here. */
3601 if (ANON_AGGR_TYPE_P (t))
3603 fixup_anonymous_aggr (t);
3605 if (TYPE_FIELDS (t))
3607 tree decl = grokdeclarator (/*declarator=*/NULL,
3608 declspecs, NORMAL, 0, NULL);
3609 finish_anon_union (decl);
3616 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3619 groktypename (cp_decl_specifier_seq *type_specifiers,
3620 const cp_declarator *declarator)
3624 attrs = type_specifiers->attributes;
3625 type_specifiers->attributes = NULL_TREE;
3626 type = grokdeclarator (declarator, type_specifiers, TYPENAME, 0, &attrs);
3628 cplus_decl_attributes (&type, attrs, 0);
3632 /* Decode a declarator in an ordinary declaration or data definition.
3633 This is called as soon as the type information and variable name
3634 have been parsed, before parsing the initializer if any.
3635 Here we create the ..._DECL node, fill in its type,
3636 and put it on the list of decls for the current context.
3637 The ..._DECL node is returned as the value.
3639 Exception: for arrays where the length is not specified,
3640 the type is left null, to be filled in by `cp_finish_decl'.
3642 Function definitions do not come here; they go to start_function
3643 instead. However, external and forward declarations of functions
3644 do go through here. Structure field declarations are done by
3645 grokfield and not through here. */
3648 start_decl (const cp_declarator *declarator,
3649 cp_decl_specifier_seq *declspecs,
3652 tree prefix_attributes,
3653 tree *pushed_scope_p)
3659 *pushed_scope_p = NULL_TREE;
3661 /* This should only be done once on the top most decl. */
3662 if (have_extern_spec)
3664 declspecs->storage_class = sc_extern;
3665 have_extern_spec = false;
3668 /* An object declared as __attribute__((deprecated)) suppresses
3669 warnings of uses of other deprecated items. */
3670 if (lookup_attribute ("deprecated", attributes))
3671 deprecated_state = DEPRECATED_SUPPRESS;
3673 attributes = chainon (attributes, prefix_attributes);
3675 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
3678 deprecated_state = DEPRECATED_NORMAL;
3680 if (decl == NULL_TREE || TREE_CODE (decl) == VOID_TYPE
3681 || decl == error_mark_node)
3682 return error_mark_node;
3684 type = TREE_TYPE (decl);
3686 context = DECL_CONTEXT (decl);
3690 *pushed_scope_p = push_scope (context);
3692 /* We are only interested in class contexts, later. */
3693 if (TREE_CODE (context) == NAMESPACE_DECL)
3694 context = NULL_TREE;
3698 /* Is it valid for this decl to have an initializer at all?
3699 If not, set INITIALIZED to zero, which will indirectly
3700 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
3701 switch (TREE_CODE (decl))
3704 error ("typedef %qD is initialized (use __typeof__ instead)", decl);
3709 error ("function %q#D is initialized like a variable", decl);
3719 if (! toplevel_bindings_p ()
3720 && DECL_EXTERNAL (decl))
3721 warning (0, "declaration of %q#D has %<extern%> and is initialized",
3723 DECL_EXTERNAL (decl) = 0;
3724 if (toplevel_bindings_p ())
3725 TREE_STATIC (decl) = 1;
3727 /* Tell `pushdecl' this is an initialized decl
3728 even though we don't yet have the initializer expression.
3729 Also tell `cp_finish_decl' it may store the real initializer. */
3730 DECL_INITIAL (decl) = error_mark_node;
3733 /* Set attributes here so if duplicate decl, will have proper attributes. */
3734 cplus_decl_attributes (&decl, attributes, 0);
3736 /* If #pragma weak was used, mark the decl weak now. */
3737 maybe_apply_pragma_weak (decl);
3739 if (TREE_CODE (decl) == FUNCTION_DECL
3740 && DECL_DECLARED_INLINE_P (decl)
3741 && DECL_UNINLINABLE (decl)
3742 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
3743 warning (0, "inline function %q+D given attribute noinline", decl);
3745 if (context && COMPLETE_TYPE_P (complete_type (context)))
3747 if (TREE_CODE (decl) == VAR_DECL)
3749 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
3750 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
3751 error ("%q#D is not a static member of %q#T", decl, context);
3754 if (DECL_CONTEXT (field) != context)
3756 if (!same_type_p (DECL_CONTEXT (field), context))
3757 pedwarn ("ISO C++ does not permit %<%T::%D%> "
3758 "to be defined as %<%T::%D%>",
3759 DECL_CONTEXT (field), DECL_NAME (decl),
3760 context, DECL_NAME (decl));
3761 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
3763 if (processing_specialization
3764 && template_class_depth (context) == 0
3765 && CLASSTYPE_TEMPLATE_SPECIALIZATION (context))
3766 error ("template header not allowed in member definition "
3767 "of explicitly specialized class");
3768 /* Static data member are tricky; an in-class initialization
3769 still doesn't provide a definition, so the in-class
3770 declaration will have DECL_EXTERNAL set, but will have an
3771 initialization. Thus, duplicate_decls won't warn
3772 about this situation, and so we check here. */
3773 if (DECL_INITIAL (decl)
3774 && DECL_INITIALIZED_IN_CLASS_P (field))
3775 error ("duplicate initialization of %qD", decl);
3776 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
3782 tree field = check_classfn (context, decl,
3783 (processing_template_decl
3784 > template_class_depth (context))
3785 ? current_template_parms
3787 if (field && duplicate_decls (decl, field,
3788 /*newdecl_is_friend=*/false))
3792 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
3793 DECL_IN_AGGR_P (decl) = 0;
3794 /* Do not mark DECL as an explicit specialization if it was not
3795 already marked as an instantiation; a declaration should
3796 never be marked as a specialization unless we know what
3797 template is being specialized. */
3798 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
3800 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
3802 /* [temp.expl.spec] An explicit specialization of a static data
3803 member of a template is a definition if the declaration
3804 includes an initializer; otherwise, it is a declaration.
3806 We check for processing_specialization so this only applies
3807 to the new specialization syntax. */
3808 if (!DECL_INITIAL (decl)
3809 && processing_specialization)
3810 DECL_EXTERNAL (decl) = 1;
3813 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl))
3814 pedwarn ("declaration of %q#D outside of class is not definition",
3818 /* Enter this declaration into the symbol table. */
3819 tem = maybe_push_decl (decl);
3821 if (processing_template_decl)
3822 tem = push_template_decl (tem);
3823 if (tem == error_mark_node)
3824 return error_mark_node;
3826 #if ! defined (ASM_OUTPUT_BSS) && ! defined (ASM_OUTPUT_ALIGNED_BSS)
3827 /* Tell the back-end to use or not use .common as appropriate. If we say
3828 -fconserve-space, we want this to save .data space, at the expense of
3829 wrong semantics. If we say -fno-conserve-space, we want this to
3830 produce errors about redefs; to do this we force variables into the
3832 DECL_COMMON (tem) = ((TREE_CODE (tem) != VAR_DECL
3833 || !DECL_THREAD_LOCAL_P (tem))
3834 && (flag_conserve_space || ! TREE_PUBLIC (tem)));
3837 if (! processing_template_decl)
3844 start_decl_1 (tree decl)
3846 tree type = TREE_TYPE (decl);
3847 int initialized = (DECL_INITIAL (decl) != NULL_TREE);
3849 if (type == error_mark_node)
3853 /* Is it valid for this decl to have an initializer at all?
3854 If not, set INITIALIZED to zero, which will indirectly
3855 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
3857 /* Don't allow initializations for incomplete types except for
3858 arrays which might be completed by the initialization. */
3859 if (COMPLETE_TYPE_P (complete_type (type)))
3860 ; /* A complete type is ok. */
3861 else if (TREE_CODE (type) != ARRAY_TYPE)
3863 error ("variable %q#D has initializer but incomplete type", decl);
3865 type = TREE_TYPE (decl) = error_mark_node;
3867 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
3869 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
3870 error ("elements of array %q#D have incomplete type", decl);
3871 /* else we already gave an error in start_decl. */
3877 && TREE_CODE (decl) != TYPE_DECL
3878 && TREE_CODE (decl) != TEMPLATE_DECL
3879 && type != error_mark_node
3880 && IS_AGGR_TYPE (type)
3881 && ! DECL_EXTERNAL (decl))
3883 if ((! processing_template_decl || ! uses_template_parms (type))
3884 && !COMPLETE_TYPE_P (complete_type (type)))
3886 error ("aggregate %q#D has incomplete type and cannot be defined",
3888 /* Change the type so that assemble_variable will give
3889 DECL an rtl we can live with: (mem (const_int 0)). */
3890 type = TREE_TYPE (decl) = error_mark_node;
3894 /* If any base type in the hierarchy of TYPE needs a constructor,
3895 then we set initialized to 1. This way any nodes which are
3896 created for the purposes of initializing this aggregate
3897 will live as long as it does. This is necessary for global
3898 aggregates which do not have their initializers processed until
3899 the end of the file. */
3900 initialized = TYPE_NEEDS_CONSTRUCTING (type);
3905 DECL_INITIAL (decl) = NULL_TREE;
3907 /* Create a new scope to hold this declaration if necessary.
3908 Whether or not a new scope is necessary cannot be determined
3909 until after the type has been completed; if the type is a
3910 specialization of a class template it is not until after
3911 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
3912 will be set correctly. */
3913 maybe_push_cleanup_level (type);
3916 /* Handle initialization of references. DECL, TYPE, and INIT have the
3917 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
3918 but will be set to a new CLEANUP_STMT if a temporary is created
3919 that must be destroyed subsequently.
3921 Returns an initializer expression to use to initialize DECL, or
3922 NULL if the initialization can be performed statically.
3924 Quotes on semantics can be found in ARM 8.4.3. */
3927 grok_reference_init (tree decl, tree type, tree init, tree *cleanup)
3931 if (init == NULL_TREE)
3933 if ((DECL_LANG_SPECIFIC (decl) == 0
3934 || DECL_IN_AGGR_P (decl) == 0)
3935 && ! DECL_THIS_EXTERN (decl))
3936 error ("%qD declared as reference but not initialized", decl);
3940 if (TREE_CODE (init) == CONSTRUCTOR)
3942 error ("ISO C++ forbids use of initializer list to "
3943 "initialize reference %qD", decl);
3947 if (TREE_CODE (init) == TREE_LIST)
3948 init = build_x_compound_expr_from_list (init, "initializer");
3950 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
3951 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
3952 /* Note: default conversion is only called in very special cases. */
3953 init = decay_conversion (init);
3955 /* Convert INIT to the reference type TYPE. This may involve the
3956 creation of a temporary, whose lifetime must be the same as that
3957 of the reference. If so, a DECL_EXPR for the temporary will be
3958 added just after the DECL_EXPR for DECL. That's why we don't set
3959 DECL_INITIAL for local references (instead assigning to them
3960 explicitly); we need to allow the temporary to be initialized
3962 tmp = initialize_reference (type, init, decl, cleanup);
3964 if (tmp == error_mark_node)
3966 else if (tmp == NULL_TREE)
3968 error ("cannot initialize %qT from %qT", type, TREE_TYPE (init));
3972 if (TREE_STATIC (decl) && !TREE_CONSTANT (tmp))
3975 DECL_INITIAL (decl) = tmp;
3980 /* When parsing `int a[] = {1, 2};' we don't know the size of the
3981 array until we finish parsing the initializer. If that's the
3982 situation we're in, update DECL accordingly. */
3985 maybe_deduce_size_from_array_init (tree decl, tree init)
3987 tree type = TREE_TYPE (decl);
3989 if (TREE_CODE (type) == ARRAY_TYPE
3990 && TYPE_DOMAIN (type) == NULL_TREE
3991 && TREE_CODE (decl) != TYPE_DECL)
3993 /* do_default is really a C-ism to deal with tentative definitions.
3994 But let's leave it here to ease the eventual merge. */
3995 int do_default = !DECL_EXTERNAL (decl);
3996 tree initializer = init ? init : DECL_INITIAL (decl);
3997 int failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
4001 error ("initializer fails to determine size of %qD", decl);
4006 error ("array size missing in %qD", decl);
4007 /* If a `static' var's size isn't known, make it extern as
4008 well as static, so it does not get allocated. If it's not
4009 `static', then don't mark it extern; finish_incomplete_decl
4010 will give it a default size and it will get allocated. */
4011 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4012 DECL_EXTERNAL (decl) = 1;
4016 error ("zero-size array %qD", decl);
4018 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
4020 layout_decl (decl, 0);
4024 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
4025 any appropriate error messages regarding the layout. */
4028 layout_var_decl (tree decl)
4030 tree type = TREE_TYPE (decl);
4032 /* If we haven't already layed out this declaration, do so now.
4033 Note that we must not call complete type for an external object
4034 because it's type might involve templates that we are not
4035 supposed to instantiate yet. (And it's perfectly valid to say
4036 `extern X x' for some incomplete type `X'.) */
4037 if (!DECL_EXTERNAL (decl))
4038 complete_type (type);
4039 if (!DECL_SIZE (decl)
4040 && TREE_TYPE (decl) != error_mark_node
4041 && (COMPLETE_TYPE_P (type)
4042 || (TREE_CODE (type) == ARRAY_TYPE
4043 && !TYPE_DOMAIN (type)
4044 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
4045 layout_decl (decl, 0);
4047 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
4049 /* An automatic variable with an incomplete type: that is an error.
4050 Don't talk about array types here, since we took care of that
4051 message in grokdeclarator. */
4052 error ("storage size of %qD isn't known", decl);
4053 TREE_TYPE (decl) = error_mark_node;
4056 /* Keep this code around in case we later want to control debug info
4057 based on whether a type is "used". (jason 1999-11-11) */
4059 else if (!DECL_EXTERNAL (decl) && IS_AGGR_TYPE (ttype))
4060 /* Let debugger know it should output info for this type. */
4061 note_debug_info_needed (ttype);
4063 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4064 note_debug_info_needed (DECL_CONTEXT (decl));
4067 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4068 && DECL_SIZE (decl) != NULL_TREE
4069 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4071 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4072 constant_expression_warning (DECL_SIZE (decl));
4074 error ("storage size of %qD isn't constant", decl);
4077 if (TREE_STATIC (decl)
4078 && !DECL_ARTIFICIAL (decl)
4079 && current_function_decl
4080 && DECL_CONTEXT (decl) == current_function_decl)
4081 push_local_name (decl);
4084 /* If a local static variable is declared in an inline function, or if
4085 we have a weak definition, we must endeavor to create only one
4086 instance of the variable at link-time. */
4089 maybe_commonize_var (tree decl)
4091 /* Static data in a function with comdat linkage also has comdat
4093 if (TREE_STATIC (decl)
4094 /* Don't mess with __FUNCTION__. */
4095 && ! DECL_ARTIFICIAL (decl)
4096 && DECL_FUNCTION_SCOPE_P (decl)
4097 /* Unfortunately, import_export_decl has not always been called
4098 before the function is processed, so we cannot simply check
4100 && (DECL_COMDAT (DECL_CONTEXT (decl))
4101 || ((DECL_DECLARED_INLINE_P (DECL_CONTEXT (decl))
4102 || DECL_TEMPLATE_INSTANTIATION (DECL_CONTEXT (decl)))
4103 && TREE_PUBLIC (DECL_CONTEXT (decl)))))
4107 /* With weak symbols, we simply make the variable COMDAT;
4108 that will cause copies in multiple translations units to
4110 comdat_linkage (decl);
4114 if (DECL_INITIAL (decl) == NULL_TREE
4115 || DECL_INITIAL (decl) == error_mark_node)
4117 /* Without weak symbols, we can use COMMON to merge
4118 uninitialized variables. */
4119 TREE_PUBLIC (decl) = 1;
4120 DECL_COMMON (decl) = 1;
4124 /* While for initialized variables, we must use internal
4125 linkage -- which means that multiple copies will not
4127 TREE_PUBLIC (decl) = 0;
4128 DECL_COMMON (decl) = 0;
4129 warning (0, "sorry: semantics of inline function static "
4130 "data %q+#D are wrong (you'll wind up "
4131 "with multiple copies)", decl);
4132 warning (0, "%J you can work around this by removing "
4138 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4139 /* Set it up again; we might have set DECL_INITIAL since the last
4141 comdat_linkage (decl);
4144 /* Issue an error message if DECL is an uninitialized const variable. */
4147 check_for_uninitialized_const_var (tree decl)
4149 tree type = TREE_TYPE (decl);
4151 /* ``Unless explicitly declared extern, a const object does not have
4152 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4154 if (TREE_CODE (decl) == VAR_DECL
4155 && TREE_CODE (type) != REFERENCE_TYPE
4156 && CP_TYPE_CONST_P (type)
4157 && !TYPE_NEEDS_CONSTRUCTING (type)
4158 && !DECL_INITIAL (decl))
4159 error ("uninitialized const %qD", decl);
4163 /* Structure holding the current initializer being processed by reshape_init.
4164 CUR is a pointer to the current element being processed, END is a pointer
4165 after the last element present in the initializer. */
4166 typedef struct reshape_iterator_t
4168 constructor_elt *cur;
4169 constructor_elt *end;
4172 static tree reshape_init_r (tree, reshape_iter *, bool);
4174 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4175 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4176 initialized. If there are no more such fields, the return value
4180 next_initializable_field (tree field)
4183 && (TREE_CODE (field) != FIELD_DECL
4184 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4185 || DECL_ARTIFICIAL (field)))
4186 field = TREE_CHAIN (field);
4191 /* Subroutine of reshape_init_array and reshape_init_vector, which does
4192 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
4193 INTEGER_CST representing the size of the array minus one (the maximum index),
4194 or NULL_TREE if the array was declared without specifying the size. D is
4195 the iterator within the constructor. */
4198 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d)
4201 bool sized_array_p = (max_index != NULL_TREE);
4202 unsigned HOST_WIDE_INT max_index_cst = 0;
4203 unsigned HOST_WIDE_INT index;
4205 /* The initializer for an array is always a CONSTRUCTOR. */
4206 new_init = build_constructor (NULL_TREE, NULL);
4210 /* Minus 1 is used for zero sized arrays. */
4211 if (integer_all_onesp (max_index))
4214 if (host_integerp (max_index, 1))
4215 max_index_cst = tree_low_cst (max_index, 1);
4216 /* sizetype is sign extended, not zero extended. */
4218 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
4222 /* Loop until there are no more initializers. */
4224 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
4231 /* Handle array designated initializers (GNU extension). */
4232 if (TREE_CODE (d->cur->index) == IDENTIFIER_NODE)
4234 error ("name %qD used in a GNU-style designated "
4235 "initializer for an array", d->cur->index);
4241 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false);
4242 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), NULL_TREE, elt_init);
4248 /* Subroutine of reshape_init_r, processes the initializers for arrays.
4249 Parameters are the same of reshape_init_r. */
4252 reshape_init_array (tree type, reshape_iter *d)
4254 tree max_index = NULL_TREE;
4256 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
4258 if (TYPE_DOMAIN (type))
4259 max_index = array_type_nelts (type);
4261 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4264 /* Subroutine of reshape_init_r, processes the initializers for vectors.
4265 Parameters are the same of reshape_init_r. */
4268 reshape_init_vector (tree type, reshape_iter *d)
4270 tree max_index = NULL_TREE;
4273 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
4275 if (COMPOUND_LITERAL_P (d->cur->value))
4277 tree value = d->cur->value;
4278 if (!same_type_p (TREE_TYPE (value), type))
4280 error ("invalid type %qT as initializer for a vector of type %qT",
4281 TREE_TYPE (d->cur->value), type);
4282 value = error_mark_node;
4288 /* For a vector, the representation type is a struct
4289 containing a single member which is an array of the
4290 appropriate size. */
4291 rtype = TYPE_DEBUG_REPRESENTATION_TYPE (type);
4292 if (rtype && TYPE_DOMAIN (TREE_TYPE (TYPE_FIELDS (rtype))))
4293 max_index = array_type_nelts (TREE_TYPE (TYPE_FIELDS (rtype)));
4295 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4298 /* Subroutine of reshape_init_r, processes the initializers for classes
4299 or union. Parameters are the same of reshape_init_r. */
4302 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p)
4307 gcc_assert (CLASS_TYPE_P (type));
4309 /* The initializer for a class is always a CONSTRUCTOR. */
4310 new_init = build_constructor (NULL_TREE, NULL);
4311 field = next_initializable_field (TYPE_FIELDS (type));
4317 An initializer for an aggregate member that is an
4318 empty class shall have the form of an empty
4319 initializer-list {}. */
4320 if (!first_initializer_p)
4322 error ("initializer for %qT must be brace-enclosed", type);
4323 return error_mark_node;
4328 /* Loop through the initializable fields, gathering initializers. */
4329 while (d->cur != d->end)
4333 /* Handle designated initializers, as an extension. */
4337 pedwarn ("ISO C++ does not allow designated initializers");
4339 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
4341 if (!field || TREE_CODE (field) != FIELD_DECL)
4342 error ("%qT has no non-static data member named %qD", type,
4346 /* If we processed all the member of the class, we are done. */
4350 field_init = reshape_init_r (TREE_TYPE (field), d,
4351 /*first_initializer_p=*/false);
4352 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
4356 When a union is initialized with a brace-enclosed
4357 initializer, the braces shall only contain an
4358 initializer for the first member of the union. */
4359 if (TREE_CODE (type) == UNION_TYPE)
4362 field = next_initializable_field (TREE_CHAIN (field));
4368 /* Subroutine of reshape_init, which processes a single initializer (part of
4369 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
4370 iterator within the CONSTRUCTOR which points to the initializer to process.
4371 FIRST_INITIALIZER_P is true if this is the first initializer of the
4372 CONSTRUCTOR node. */
4375 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p)
4377 tree init = d->cur->value;
4379 /* A non-aggregate type is always initialized with a single
4381 if (!CP_AGGREGATE_TYPE_P (type))
4383 /* It is invalid to initialize a non-aggregate type with a
4384 brace-enclosed initializer.
4385 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
4386 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
4387 a CONSTRUCTOR (with a record type). */
4388 if (TREE_CODE (init) == CONSTRUCTOR
4389 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
4391 error ("braces around scalar initializer for type %qT", type);
4392 init = error_mark_node;
4401 All implicit type conversions (clause _conv_) are considered when
4402 initializing the aggregate member with an initializer from an
4403 initializer-list. If the initializer can initialize a member,
4404 the member is initialized. Otherwise, if the member is itself a
4405 non-empty subaggregate, brace elision is assumed and the
4406 initializer is considered for the initialization of the first
4407 member of the subaggregate. */
4408 if (TREE_CODE (init) != CONSTRUCTOR
4409 && can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL))
4415 /* [dcl.init.string]
4417 A char array (whether plain char, signed char, or unsigned char)
4418 can be initialized by a string-literal (optionally enclosed in
4419 braces); a wchar_t array can be initialized by a wide
4420 string-literal (optionally enclosed in braces). */
4421 if (TREE_CODE (type) == ARRAY_TYPE
4422 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
4424 tree str_init = init;
4426 /* Strip one level of braces if and only if they enclose a single
4427 element (as allowed by [dcl.init.string]). */
4428 if (!first_initializer_p
4429 && TREE_CODE (str_init) == CONSTRUCTOR
4430 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (str_init)) == 1)
4432 str_init = VEC_index (constructor_elt,
4433 CONSTRUCTOR_ELTS (str_init), 0)->value;
4436 /* If it's a string literal, then it's the initializer for the array
4437 as a whole. Otherwise, continue with normal initialization for
4438 array types (one value per array element). */
4439 if (TREE_CODE (str_init) == STRING_CST)
4446 /* The following cases are about aggregates. If we are not within a full
4447 initializer already, and there is not a CONSTRUCTOR, it means that there
4448 is a missing set of braces (that is, we are processing the case for
4449 which reshape_init exists). */
4450 if (!first_initializer_p)
4452 if (TREE_CODE (init) == CONSTRUCTOR)
4454 /* For a nested compound literal, there is no need to reshape since
4455 brace elision is not allowed. Even if we decided to allow it,
4456 we should add a call to reshape_init in finish_compound_literal,
4457 before calling digest_init, so changing this code would still
4458 not be necessary. */
4459 if (!COMPOUND_LITERAL_P (init))
4462 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
4463 return reshape_init (type, init);
4466 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
4469 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
4473 /* Dispatch to specialized routines. */
4474 if (CLASS_TYPE_P (type))
4475 return reshape_init_class (type, d, first_initializer_p);
4476 else if (TREE_CODE (type) == ARRAY_TYPE)
4477 return reshape_init_array (type, d);
4478 else if (TREE_CODE (type) == VECTOR_TYPE)
4479 return reshape_init_vector (type, d);
4484 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
4485 brace-enclosed aggregate initializer.
4487 INIT is the CONSTRUCTOR containing the list of initializers describing
4488 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
4489 It may not presently match the shape of the TYPE; for example:
4491 struct S { int a; int b; };
4492 struct S a[] = { 1, 2, 3, 4 };
4494 Here INIT will hold a VEC of four elements, rather than a
4495 VEC of two elements, each itself a VEC of two elements. This
4496 routine transforms INIT from the former form into the latter. The
4497 revised CONSTRUCTOR node is returned. */
4500 reshape_init (tree type, tree init)
4502 VEC(constructor_elt, gc) *v;
4506 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
4508 v = CONSTRUCTOR_ELTS (init);
4510 /* An empty constructor does not need reshaping, and it is always a valid
4512 if (VEC_empty (constructor_elt, v))
4515 /* Recurse on this CONSTRUCTOR. */
4516 d.cur = VEC_index (constructor_elt, v, 0);
4517 d.end = d.cur + VEC_length (constructor_elt, v);
4519 new_init = reshape_init_r (type, &d, true);
4521 /* Make sure all the element of the constructor were used. Otherwise,
4522 issue an error about exceeding initializers. */
4524 error ("too many initializers for %qT", type);
4529 /* Verify INIT (the initializer for DECL), and record the
4530 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
4531 grok_reference_init.
4533 If the return value is non-NULL, it is an expression that must be
4534 evaluated dynamically to initialize DECL. */
4537 check_initializer (tree decl, tree init, int flags, tree *cleanup)
4539 tree type = TREE_TYPE (decl);
4540 tree init_code = NULL;
4542 /* If `start_decl' didn't like having an initialization, ignore it now. */
4543 if (init != NULL_TREE && DECL_INITIAL (decl) == NULL_TREE)
4546 /* If an initializer is present, DECL_INITIAL has been
4547 error_mark_node, to indicate that an as-of-yet unevaluated
4548 initialization will occur. From now on, DECL_INITIAL reflects
4549 the static initialization -- if any -- of DECL. */
4550 DECL_INITIAL (decl) = NULL_TREE;
4552 /* Things that are going to be initialized need to have complete
4554 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
4556 if (type == error_mark_node)
4557 /* We will have already complained. */
4559 else if (init && COMPLETE_TYPE_P (type)
4560 && !TREE_CONSTANT (TYPE_SIZE (type)))
4562 error ("variable-sized object %qD may not be initialized", decl);
4565 else if (TREE_CODE (type) == ARRAY_TYPE
4566 && !COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4568 error ("elements of array %q#D have incomplete type", decl);
4571 else if (TREE_CODE (type) != ARRAY_TYPE && !COMPLETE_TYPE_P (type))
4573 error ("%qD has incomplete type", decl);
4574 TREE_TYPE (decl) = error_mark_node;
4578 if (TREE_CODE (decl) == CONST_DECL)
4580 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
4582 DECL_INITIAL (decl) = init;
4584 gcc_assert (init != NULL_TREE);
4587 else if (!DECL_EXTERNAL (decl) && TREE_CODE (type) == REFERENCE_TYPE)
4588 init = grok_reference_init (decl, type, init, cleanup);
4591 /* Do not reshape constructors of vectors (they don't need to be
4593 if (TREE_CODE (init) == CONSTRUCTOR
4594 && !COMPOUND_LITERAL_P (init)
4595 && !TREE_TYPE (init)) /* ptrmemfunc */
4597 init = reshape_init (type, init);
4599 if ((*targetm.vector_opaque_p) (type))
4601 error ("opaque vector types cannot be initialized");
4602 init = error_mark_node;
4606 /* If DECL has an array type without a specific bound, deduce the
4607 array size from the initializer. */
4608 maybe_deduce_size_from_array_init (decl, init);
4609 type = TREE_TYPE (decl);
4611 if (TYPE_HAS_CONSTRUCTOR (type) || TYPE_NEEDS_CONSTRUCTING (type))
4613 if (TREE_CODE (type) == ARRAY_TYPE)
4614 goto initialize_aggr;
4615 else if (TREE_CODE (init) == CONSTRUCTOR)
4617 if (TYPE_NON_AGGREGATE_CLASS (type))
4619 error ("%qD must be initialized by constructor, "
4622 init = error_mark_node;
4625 goto dont_use_constructor;
4629 int saved_stmts_are_full_exprs_p;
4632 saved_stmts_are_full_exprs_p = 0;
4633 if (building_stmt_tree ())
4635 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
4636 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
4638 init = build_aggr_init (decl, init, flags);
4639 if (building_stmt_tree ())
4640 current_stmt_tree ()->stmts_are_full_exprs_p =
4641 saved_stmts_are_full_exprs_p;
4647 dont_use_constructor:
4648 if (TREE_CODE (init) != TREE_VEC)
4650 init_code = store_init_value (decl, init);
4651 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
4652 && DECL_INITIAL (decl)
4653 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
4654 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
4655 warning (0, "array %qD initialized by parenthesized string literal %qE",
4656 decl, DECL_INITIAL (decl));
4661 else if (DECL_EXTERNAL (decl))
4663 else if (TYPE_P (type) && TYPE_NEEDS_CONSTRUCTING (type))
4664 goto initialize_aggr;
4665 else if (IS_AGGR_TYPE (type))
4667 tree core_type = strip_array_types (type);
4669 if (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type))
4670 error ("structure %qD with uninitialized const members", decl);
4671 if (CLASSTYPE_REF_FIELDS_NEED_INIT (core_type))
4672 error ("structure %qD with uninitialized reference members", decl);
4674 check_for_uninitialized_const_var (decl);
4677 check_for_uninitialized_const_var (decl);
4679 if (init && init != error_mark_node)
4680 init_code = build2 (INIT_EXPR, type, decl, init);
4685 /* If DECL is not a local variable, give it RTL. */
4688 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
4690 int toplev = toplevel_bindings_p ();
4692 const char *filename;
4694 /* Set the DECL_ASSEMBLER_NAME for the object. */
4697 /* The `register' keyword, when used together with an
4698 asm-specification, indicates that the variable should be
4699 placed in a particular register. */
4700 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
4702 set_user_assembler_name (decl, asmspec);
4703 DECL_HARD_REGISTER (decl) = 1;
4707 if (TREE_CODE (decl) == FUNCTION_DECL
4708 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
4709 set_builtin_user_assembler_name (decl, asmspec);
4710 set_user_assembler_name (decl, asmspec);
4714 /* Handle non-variables up front. */
4715 if (TREE_CODE (decl) != VAR_DECL)
4717 rest_of_decl_compilation (decl, toplev, at_eof);
4721 /* If we see a class member here, it should be a static data
4723 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
4725 gcc_assert (TREE_STATIC (decl));
4726 /* An in-class declaration of a static data member should be
4727 external; it is only a declaration, and not a definition. */
4728 if (init == NULL_TREE)
4729 gcc_assert (DECL_EXTERNAL (decl));
4732 /* We don't create any RTL for local variables. */
4733 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
4736 /* We defer emission of local statics until the corresponding
4737 DECL_EXPR is expanded. */
4738 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
4740 /* We try to defer namespace-scope static constants so that they are
4741 not emitted into the object file unnecessarily. */
4742 filename = input_filename;
4743 if (!DECL_VIRTUAL_P (decl)
4744 && TREE_READONLY (decl)
4745 && DECL_INITIAL (decl) != NULL_TREE
4746 && DECL_INITIAL (decl) != error_mark_node
4748 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
4750 && !TREE_PUBLIC (decl))
4752 /* Fool with the linkage of static consts according to #pragma
4754 struct c_fileinfo *finfo = get_fileinfo (lbasename (filename));
4755 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
4757 TREE_PUBLIC (decl) = 1;
4758 DECL_EXTERNAL (decl) = finfo->interface_only;
4763 /* Likewise for template instantiations. */
4764 else if (DECL_LANG_SPECIFIC (decl)
4765 && DECL_IMPLICIT_INSTANTIATION (decl))
4768 /* If we're not deferring, go ahead and assemble the variable. */
4770 rest_of_decl_compilation (decl, toplev, at_eof);
4773 /* Generate code to initialize DECL (a local variable). */
4776 initialize_local_var (tree decl, tree init)
4778 tree type = TREE_TYPE (decl);
4781 gcc_assert (TREE_CODE (decl) == VAR_DECL
4782 || TREE_CODE (decl) == RESULT_DECL);
4783 gcc_assert (!TREE_STATIC (decl));
4785 if (DECL_SIZE (decl) == NULL_TREE)
4787 /* If we used it already as memory, it must stay in memory. */
4788 DECL_INITIAL (decl) = NULL_TREE;
4789 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
4792 if (DECL_SIZE (decl) && type != error_mark_node)
4796 /* Compute and store the initial value. */
4797 already_used = TREE_USED (decl) || TREE_USED (type);
4799 /* Perform the initialization. */
4802 int saved_stmts_are_full_exprs_p;
4804 gcc_assert (building_stmt_tree ());
4805 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
4806 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
4807 finish_expr_stmt (init);
4808 current_stmt_tree ()->stmts_are_full_exprs_p =
4809 saved_stmts_are_full_exprs_p;
4812 /* Set this to 0 so we can tell whether an aggregate which was
4813 initialized was ever used. Don't do this if it has a
4814 destructor, so we don't complain about the 'resource
4815 allocation is initialization' idiom. Now set
4816 attribute((unused)) on types so decls of that type will be
4817 marked used. (see TREE_USED, above.) */
4818 if (TYPE_NEEDS_CONSTRUCTING (type)
4820 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
4821 && DECL_NAME (decl))
4822 TREE_USED (decl) = 0;
4823 else if (already_used)
4824 TREE_USED (decl) = 1;
4827 /* Generate a cleanup, if necessary. */
4828 cleanup = cxx_maybe_build_cleanup (decl);
4829 if (DECL_SIZE (decl) && cleanup)
4830 finish_decl_cleanup (decl, cleanup);
4833 /* DECL is a VAR_DECL for a compiler-generated variable with static
4834 storage duration (like a virtual table) whose initializer is a
4835 compile-time constant. INIT must be either a TREE_LIST of values,
4836 or a CONSTRUCTOR. Initialize the variable and provide it to the
4840 initialize_artificial_var (tree decl, tree init)
4842 if (TREE_CODE (init) == TREE_LIST)
4843 init = build_constructor_from_list (NULL_TREE, init);
4844 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
4845 DECL_INITIAL (decl) = init;
4846 DECL_INITIALIZED_P (decl) = 1;
4847 determine_visibility (decl);
4848 layout_var_decl (decl);
4849 maybe_commonize_var (decl);
4850 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
4853 /* Finish processing of a declaration;
4854 install its line number and initial value.
4855 If the length of an array type is not known before,
4856 it must be determined now, from the initial value, or it is an error.
4858 INIT holds the value of an initializer that should be allowed to escape
4861 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
4862 if the (init) syntax was used. */
4865 cp_finish_decl (tree decl, tree init, tree asmspec_tree, int flags)
4869 const char *asmspec = NULL;
4870 int was_readonly = 0;
4871 bool var_definition_p = false;
4873 if (decl == error_mark_node)
4878 error ("assignment (not initialization) in declaration");
4882 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
4884 /* Assume no cleanup is required. */
4885 cleanup = NULL_TREE;
4887 /* If a name was specified, get the string. */
4888 if (global_scope_p (current_binding_level))
4889 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
4891 asmspec = TREE_STRING_POINTER (asmspec_tree);
4893 if (init && TREE_CODE (init) == NAMESPACE_DECL)
4895 error ("cannot initialize %qD to namespace %qD", decl, init);
4899 if (current_class_type
4900 && CP_DECL_CONTEXT (decl) == current_class_type
4901 && TYPE_BEING_DEFINED (current_class_type)
4902 && (DECL_INITIAL (decl) || init))
4903 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
4905 type = TREE_TYPE (decl);
4907 if (type == error_mark_node)
4910 if (processing_template_decl)
4912 /* Add this declaration to the statement-tree. */
4913 if (at_function_scope_p ())
4914 add_decl_expr (decl);
4916 if (init && DECL_INITIAL (decl))
4917 DECL_INITIAL (decl) = init;
4918 if (TREE_CODE (decl) == VAR_DECL
4919 && !DECL_PRETTY_FUNCTION_P (decl)
4920 && !dependent_type_p (TREE_TYPE (decl)))
4921 maybe_deduce_size_from_array_init (decl, init);
4926 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
4927 gcc_assert (TREE_CODE (decl) != PARM_DECL);
4929 /* Take care of TYPE_DECLs up front. */
4930 if (TREE_CODE (decl) == TYPE_DECL)
4932 if (type != error_mark_node
4933 && IS_AGGR_TYPE (type) && DECL_NAME (decl))
4935 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
4936 warning (0, "shadowing previous type declaration of %q#D", decl);
4937 set_identifier_type_value (DECL_NAME (decl), decl);
4940 /* If we have installed this as the canonical typedef for this
4941 type, and that type has not been defined yet, delay emitting
4942 the debug information for it, as we will emit it later. */
4943 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
4944 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
4945 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
4947 rest_of_decl_compilation (decl, DECL_CONTEXT (decl) == NULL_TREE,
4952 /* A reference will be modified here, as it is initialized. */
4953 if (! DECL_EXTERNAL (decl)
4954 && TREE_READONLY (decl)
4955 && TREE_CODE (type) == REFERENCE_TYPE)
4958 TREE_READONLY (decl) = 0;
4961 if (TREE_CODE (decl) == VAR_DECL)
4963 /* Only PODs can have thread-local storage. Other types may require
4964 various kinds of non-trivial initialization. */
4965 if (DECL_THREAD_LOCAL_P (decl) && !pod_type_p (TREE_TYPE (decl)))
4966 error ("%qD cannot be thread-local because it has non-POD type %qT",
4967 decl, TREE_TYPE (decl));
4968 /* Convert the initializer to the type of DECL, if we have not
4969 already initialized DECL. */
4970 if (!DECL_INITIALIZED_P (decl)
4971 /* If !DECL_EXTERNAL then DECL is being defined. In the
4972 case of a static data member initialized inside the
4973 class-specifier, there can be an initializer even if DECL
4974 is *not* defined. */
4975 && (!DECL_EXTERNAL (decl) || init))
4978 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
4979 init = check_initializer (decl, init, flags, &cleanup);
4980 /* Thread-local storage cannot be dynamically initialized. */
4981 if (DECL_THREAD_LOCAL_P (decl) && init)
4983 error ("%qD is thread-local and so cannot be dynamically "
4984 "initialized", decl);
4988 /* Check that the initializer for a static data member was a
4989 constant. Although we check in the parser that the
4990 initializer is an integral constant expression, we do not
4991 simplify division-by-zero at the point at which it
4992 occurs. Therefore, in:
4994 struct S { static const int i = 7 / 0; };
4996 we issue an error at this point. It would
4997 probably be better to forbid division by zero in
4998 integral constant expressions. */
4999 if (DECL_EXTERNAL (decl) && init)
5001 error ("%qD cannot be initialized by a non-constant expression"
5002 " when being declared", decl);
5003 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
5011 The memory occupied by any object of static storage
5012 duration is zero-initialized at program startup before
5013 any other initialization takes place.
5015 We cannot create an appropriate initializer until after
5016 the type of DECL is finalized. If DECL_INITIAL is set,
5017 then the DECL is statically initialized, and any
5018 necessary zero-initialization has already been performed. */
5019 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
5020 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
5021 /*nelts=*/NULL_TREE,
5022 /*static_storage_p=*/true);
5023 /* Remember that the initialization for this variable has
5025 DECL_INITIALIZED_P (decl) = 1;
5026 /* This declaration is the definition of this variable,
5027 unless we are initializing a static data member within
5028 the class specifier. */
5029 if (!DECL_EXTERNAL (decl))
5030 var_definition_p = true;
5031 /* The variable is being defined, so determine its
5033 determine_visibility (decl);
5035 /* If the variable has an array type, lay out the type, even if
5036 there is no initializer. It is valid to index through the
5037 array, and we must get TYPE_ALIGN set correctly on the array
5039 else if (TREE_CODE (type) == ARRAY_TYPE)
5043 /* Add this declaration to the statement-tree. This needs to happen
5044 after the call to check_initializer so that the DECL_EXPR for a
5045 reference temp is added before the DECL_EXPR for the reference itself. */
5046 if (at_function_scope_p ())
5047 add_decl_expr (decl);
5049 if (TREE_CODE (decl) == VAR_DECL)
5050 layout_var_decl (decl);
5052 /* Output the assembler code and/or RTL code for variables and functions,
5053 unless the type is an undefined structure or union.
5054 If not, it will get done when the type is completed. */
5055 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
5057 if (TREE_CODE (decl) == VAR_DECL)
5058 maybe_commonize_var (decl);
5060 make_rtl_for_nonlocal_decl (decl, init, asmspec);
5062 /* Check for abstractness of the type. Notice that there is no
5063 need to strip array types here since the check for those types
5064 is already done within create_array_type_for_decl. */
5065 if (TREE_CODE (type) == FUNCTION_TYPE
5066 || TREE_CODE (type) == METHOD_TYPE)
5067 abstract_virtuals_error (decl, TREE_TYPE (type));
5069 abstract_virtuals_error (decl, type);
5071 if (TREE_CODE (decl) == FUNCTION_DECL
5072 || TREE_TYPE (decl) == error_mark_node)
5073 /* No initialization required. */
5075 else if (DECL_EXTERNAL (decl)
5076 && ! (DECL_LANG_SPECIFIC (decl)
5077 && DECL_NOT_REALLY_EXTERN (decl)))
5080 DECL_INITIAL (decl) = init;
5084 /* A variable definition. */
5085 if (DECL_FUNCTION_SCOPE_P (decl))
5087 /* Initialize the local variable. */
5088 if (processing_template_decl)
5090 if (init || DECL_INITIAL (decl) == error_mark_node)
5091 DECL_INITIAL (decl) = init;
5093 else if (!TREE_STATIC (decl))
5094 initialize_local_var (decl, init);
5097 /* If a variable is defined, and then a subsequent
5098 definition with external linkage is encountered, we will
5099 get here twice for the same variable. We want to avoid
5100 calling expand_static_init more than once. For variables
5101 that are not static data members, we can call
5102 expand_static_init only when we actually process the
5103 initializer. It is not legal to redeclare a static data
5104 member, so this issue does not arise in that case. */
5105 if (var_definition_p && TREE_STATIC (decl))
5106 expand_static_init (decl, init);
5110 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
5111 reference, insert it in the statement-tree now. */
5113 push_cleanup (decl, cleanup, false);
5118 TREE_READONLY (decl) = 1;
5120 /* If this was marked 'used', be sure it will be output. */
5121 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
5122 mark_decl_referenced (decl);
5125 /* This is here for a midend callback from c-common.c. */
5128 finish_decl (tree decl, tree init, tree asmspec_tree)
5130 cp_finish_decl (decl, init, asmspec_tree, 0);
5133 /* Returns a declaration for a VAR_DECL as if:
5135 extern "C" TYPE NAME;
5137 had been seen. Used to create compiler-generated global
5141 declare_global_var (tree name, tree type)
5145 push_to_top_level ();
5146 decl = build_decl (VAR_DECL, name, type);
5147 TREE_PUBLIC (decl) = 1;
5148 DECL_EXTERNAL (decl) = 1;
5149 DECL_ARTIFICIAL (decl) = 1;
5150 /* If the user has explicitly declared this variable (perhaps
5151 because the code we are compiling is part of a low-level runtime
5152 library), then it is possible that our declaration will be merged
5153 with theirs by pushdecl. */
5154 decl = pushdecl (decl);
5155 cp_finish_decl (decl, NULL_TREE, NULL_TREE, 0);
5156 pop_from_top_level ();
5161 /* Returns a pointer to the `atexit' function. Note that if
5162 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
5163 `__cxa_atexit' function specified in the IA64 C++ ABI. */
5166 get_atexit_node (void)
5173 bool use_aeabi_atexit;
5178 if (flag_use_cxa_atexit)
5180 /* The declaration for `__cxa_atexit' is:
5182 int __cxa_atexit (void (*)(void *), void *, void *)
5184 We build up the argument types and then then function type
5187 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
5188 /* First, build the pointer-to-function type for the first
5190 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
5191 fn_type = build_function_type (void_type_node, arg_types);
5192 fn_ptr_type = build_pointer_type (fn_type);
5193 /* Then, build the rest of the argument types. */
5194 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
5195 if (use_aeabi_atexit)
5197 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
5198 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
5202 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
5203 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
5205 /* And the final __cxa_atexit type. */
5206 fn_type = build_function_type (integer_type_node, arg_types);
5207 fn_ptr_type = build_pointer_type (fn_type);
5208 if (use_aeabi_atexit)
5209 name = "__aeabi_atexit";
5211 name = "__cxa_atexit";
5215 /* The declaration for `atexit' is:
5217 int atexit (void (*)());
5219 We build up the argument types and then then function type
5221 fn_type = build_function_type (void_type_node, void_list_node);
5222 fn_ptr_type = build_pointer_type (fn_type);
5223 arg_types = tree_cons (NULL_TREE, fn_ptr_type, void_list_node);
5224 /* Build the final atexit type. */
5225 fn_type = build_function_type (integer_type_node, arg_types);
5229 /* Now, build the function declaration. */
5230 push_lang_context (lang_name_c);
5231 atexit_fndecl = build_library_fn_ptr (name, fn_type);
5232 mark_used (atexit_fndecl);
5233 pop_lang_context ();
5234 atexit_node = decay_conversion (atexit_fndecl);
5239 /* Returns the __dso_handle VAR_DECL. */
5242 get_dso_handle_node (void)
5244 if (dso_handle_node)
5245 return dso_handle_node;
5247 /* Declare the variable. */
5248 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
5251 return dso_handle_node;
5254 /* Begin a new function with internal linkage whose job will be simply
5255 to destroy some particular variable. */
5257 static GTY(()) int start_cleanup_cnt;
5260 start_cleanup_fn (void)
5267 push_to_top_level ();
5269 /* No need to mangle this. */
5270 push_lang_context (lang_name_c);
5272 /* Build the parameter-types. */
5273 parmtypes = void_list_node;
5274 /* Functions passed to __cxa_atexit take an additional parameter.
5275 We'll just ignore it. After we implement the new calling
5276 convention for destructors, we can eliminate the use of
5277 additional cleanup functions entirely in the -fnew-abi case. */
5278 if (flag_use_cxa_atexit)
5279 parmtypes = tree_cons (NULL_TREE, ptr_type_node, parmtypes);
5280 /* Build the function type itself. */
5281 fntype = build_function_type (void_type_node, parmtypes);
5282 /* Build the name of the function. */
5283 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
5284 /* Build the function declaration. */
5285 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
5286 /* It's a function with internal linkage, generated by the
5288 TREE_PUBLIC (fndecl) = 0;
5289 DECL_ARTIFICIAL (fndecl) = 1;
5290 /* Make the function `inline' so that it is only emitted if it is
5291 actually needed. It is unlikely that it will be inlined, since
5292 it is only called via a function pointer, but we avoid unnecessary
5293 emissions this way. */
5294 DECL_INLINE (fndecl) = 1;
5295 DECL_DECLARED_INLINE_P (fndecl) = 1;
5296 DECL_INTERFACE_KNOWN (fndecl) = 1;
5297 /* Build the parameter. */
5298 if (flag_use_cxa_atexit)
5302 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
5303 DECL_CONTEXT (parmdecl) = fndecl;
5304 TREE_USED (parmdecl) = 1;
5305 DECL_ARGUMENTS (fndecl) = parmdecl;
5309 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
5311 pop_lang_context ();
5313 return current_function_decl;
5316 /* Finish the cleanup function begun by start_cleanup_fn. */
5319 end_cleanup_fn (void)
5321 expand_or_defer_fn (finish_function (0));
5323 pop_from_top_level ();
5326 /* Generate code to handle the destruction of DECL, an object with
5327 static storage duration. */
5330 register_dtor_fn (tree decl)
5337 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
5338 return void_zero_node;
5340 /* Call build_cleanup before we enter the anonymous function so that
5341 any access checks will be done relative to the current scope,
5342 rather than the scope of the anonymous function. */
5343 build_cleanup (decl);
5345 /* Now start the function. */
5346 cleanup = start_cleanup_fn ();
5348 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
5349 to the original function, rather than the anonymous one. That
5350 will make the back-end think that nested functions are in use,
5351 which causes confusion. */
5353 push_deferring_access_checks (dk_no_check);
5354 fcall = build_cleanup (decl);
5355 pop_deferring_access_checks ();
5357 /* Create the body of the anonymous function. */
5358 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
5359 finish_expr_stmt (fcall);
5360 finish_compound_stmt (compound_stmt);
5363 /* Call atexit with the cleanup function. */
5364 cxx_mark_addressable (cleanup);
5365 mark_used (cleanup);
5366 cleanup = build_unary_op (ADDR_EXPR, cleanup, 0);
5367 if (flag_use_cxa_atexit)
5369 args = tree_cons (NULL_TREE,
5370 build_unary_op (ADDR_EXPR, get_dso_handle_node (), 0),
5372 if (targetm.cxx.use_aeabi_atexit ())
5374 args = tree_cons (NULL_TREE, cleanup, args);
5375 args = tree_cons (NULL_TREE, null_pointer_node, args);
5379 args = tree_cons (NULL_TREE, null_pointer_node, args);
5380 args = tree_cons (NULL_TREE, cleanup, args);
5384 args = tree_cons (NULL_TREE, cleanup, NULL_TREE);
5385 return build_function_call (get_atexit_node (), args);
5388 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
5389 is its initializer. Generate code to handle the construction
5390 and destruction of DECL. */
5393 expand_static_init (tree decl, tree init)
5395 gcc_assert (TREE_CODE (decl) == VAR_DECL);
5396 gcc_assert (TREE_STATIC (decl));
5398 /* Some variables require no initialization. */
5400 && !TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))
5401 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
5404 if (DECL_FUNCTION_SCOPE_P (decl))
5406 /* Emit code to perform this initialization but once. */
5407 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
5408 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
5409 tree guard, guard_addr, guard_addr_list;
5410 tree acquire_fn, release_fn, abort_fn;
5413 /* Emit code to perform this initialization but once. This code
5416 static <type> guard;
5417 if (!guard.first_byte) {
5418 if (__cxa_guard_acquire (&guard)) {
5421 // Do initialization.
5422 flag = true; __cxa_guard_release (&guard);
5423 // Register variable for destruction at end of program.
5425 if (!flag) __cxa_guard_abort (&guard);
5429 Note that the `flag' variable is only set to 1 *after* the
5430 initialization is complete. This ensures that an exception,
5431 thrown during the construction, will cause the variable to
5432 reinitialized when we pass through this code again, as per:
5436 If the initialization exits by throwing an exception, the
5437 initialization is not complete, so it will be tried again
5438 the next time control enters the declaration.
5440 This process should be thread-safe, too; multiple threads
5441 should not be able to initialize the variable more than
5444 /* Create the guard variable. */
5445 guard = get_guard (decl);
5447 /* This optimization isn't safe on targets with relaxed memory
5448 consistency. On such targets we force synchronization in
5449 __cxa_guard_acquire. */
5450 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
5452 /* Begin the conditional initialization. */
5453 if_stmt = begin_if_stmt ();
5454 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
5455 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
5458 if (flag_threadsafe_statics)
5460 guard_addr = build_address (guard);
5461 guard_addr_list = build_tree_list (NULL_TREE, guard_addr);
5463 acquire_fn = get_identifier ("__cxa_guard_acquire");
5464 release_fn = get_identifier ("__cxa_guard_release");
5465 abort_fn = get_identifier ("__cxa_guard_abort");
5466 if (!get_global_value_if_present (acquire_fn, &acquire_fn))
5468 tree argtypes = tree_cons (NULL_TREE, TREE_TYPE (guard_addr),
5470 tree vfntype = build_function_type (void_type_node, argtypes);
5471 acquire_fn = push_library_fn
5472 (acquire_fn, build_function_type (integer_type_node, argtypes));
5473 release_fn = push_library_fn (release_fn, vfntype);
5474 abort_fn = push_library_fn (abort_fn, vfntype);
5478 release_fn = identifier_global_value (release_fn);
5479 abort_fn = identifier_global_value (abort_fn);
5482 inner_if_stmt = begin_if_stmt ();
5483 finish_if_stmt_cond (build_call (acquire_fn, guard_addr_list),
5486 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
5487 begin = get_target_expr (boolean_false_node);
5488 flag = TARGET_EXPR_SLOT (begin);
5490 TARGET_EXPR_CLEANUP (begin)
5491 = build3 (COND_EXPR, void_type_node, flag,
5493 build_call (abort_fn, guard_addr_list));
5494 CLEANUP_EH_ONLY (begin) = 1;
5496 /* Do the initialization itself. */
5497 init = add_stmt_to_compound (begin, init);
5498 init = add_stmt_to_compound
5499 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
5500 init = add_stmt_to_compound
5501 (init, build_call (release_fn, guard_addr_list));
5504 init = add_stmt_to_compound (init, set_guard (guard));
5506 /* Use atexit to register a function for destroying this static
5508 init = add_stmt_to_compound (init, register_dtor_fn (decl));
5510 finish_expr_stmt (init);
5512 if (flag_threadsafe_statics)
5514 finish_compound_stmt (inner_then_clause);
5515 finish_then_clause (inner_if_stmt);
5516 finish_if_stmt (inner_if_stmt);
5519 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
5521 finish_compound_stmt (then_clause);
5522 finish_then_clause (if_stmt);
5523 finish_if_stmt (if_stmt);
5527 static_aggregates = tree_cons (init, decl, static_aggregates);
5531 /* Make TYPE a complete type based on INITIAL_VALUE.
5532 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
5533 2 if there was no information (in which case assume 0 if DO_DEFAULT),
5534 3 if the initializer list is empty (in pedantic mode). */
5537 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
5540 tree type, elt_type;
5544 /* An array of character type can be initialized from a
5545 brace-enclosed string constant.
5547 FIXME: this code is duplicated from reshape_init. Probably
5548 we should just call reshape_init here? */
5549 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
5550 && TREE_CODE (initial_value) == CONSTRUCTOR
5551 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
5553 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
5554 tree value = VEC_index (constructor_elt, v, 0)->value;
5556 if (TREE_CODE (value) == STRING_CST
5557 && VEC_length (constructor_elt, v) == 1)
5558 initial_value = value;
5562 failure = complete_array_type (ptype, initial_value, do_default);
5564 /* We can create the array before the element type is complete, which
5565 means that we didn't have these two bits set in the original type
5566 either. In completing the type, we are expected to propagate these
5567 bits. See also complete_type which does the same thing for arrays
5570 if (TYPE_DOMAIN (type))
5572 elt_type = TREE_TYPE (type);
5573 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
5574 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
5575 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
5581 /* Return zero if something is declared to be a member of type
5582 CTYPE when in the context of CUR_TYPE. STRING is the error
5583 message to print in that case. Otherwise, quietly return 1. */
5586 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
5588 if (ctype && ctype != cur_type)
5590 if (flags == DTOR_FLAG)
5591 error ("destructor for alien class %qT cannot be a member", ctype);
5593 error ("constructor for alien class %qT cannot be a member", ctype);
5599 /* Subroutine of `grokdeclarator'. */
5601 /* Generate errors possibly applicable for a given set of specifiers.
5602 This is for ARM $7.1.2. */
5605 bad_specifiers (tree object,
5614 error ("%qD declared as a %<virtual%> %s", object, type);
5616 error ("%qD declared as an %<inline%> %s", object, type);
5618 error ("%<const%> and %<volatile%> function specifiers on "
5619 "%qD invalid in %s declaration",
5622 error ("%q+D declared as a friend", object);
5624 && (TREE_CODE (object) == TYPE_DECL
5625 || (!TYPE_PTRFN_P (TREE_TYPE (object))
5626 && !TYPE_REFFN_P (TREE_TYPE (object))
5627 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
5628 error ("%q+D declared with an exception specification", object);
5631 /* DECL is a member function or static data member and is presently
5632 being defined. Check that the definition is taking place in a
5636 check_class_member_definition_namespace (tree decl)
5638 /* These checks only apply to member functions and static data
5640 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
5641 || TREE_CODE (decl) == VAR_DECL);
5642 /* We check for problems with specializations in pt.c in
5643 check_specialization_namespace, where we can issue better
5645 if (processing_specialization)
5647 /* There are no restrictions on the placement of
5648 explicit instantiations. */
5649 if (processing_explicit_instantiation)
5653 A member function definition that appears outside of the
5654 class definition shall appear in a namespace scope enclosing
5655 the class definition.
5659 The definition for a static data member shall appear in a
5660 namespace scope enclosing the member's class definition. */
5661 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
5662 pedwarn ("definition of %qD is not in namespace enclosing %qT",
5663 decl, DECL_CONTEXT (decl));
5666 /* CTYPE is class type, or null if non-class.
5667 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
5669 DECLARATOR is the function's name.
5670 PARMS is a chain of PARM_DECLs for the function.
5671 VIRTUALP is truthvalue of whether the function is virtual or not.
5672 FLAGS are to be passed through to `grokclassfn'.
5673 QUALS are qualifiers indicating whether the function is `const'
5675 RAISES is a list of exceptions that this function can raise.
5676 CHECK is 1 if we must find this method in CTYPE, 0 if we should
5677 not look, and -1 if we should not call `grokclassfn' at all.
5679 SFK is the kind of special function (if any) for the new function.
5681 Returns `NULL_TREE' if something goes wrong, after issuing
5682 applicable error messages. */
5685 grokfndecl (tree ctype,
5689 tree orig_declarator,
5691 enum overload_flags flags,
5698 special_function_kind sfk,
5705 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
5709 type = build_exception_variant (type, raises);
5711 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
5712 DECL_ARGUMENTS (decl) = parms;
5713 /* Propagate volatile out from type to decl. */
5714 if (TYPE_VOLATILE (type))
5715 TREE_THIS_VOLATILE (decl) = 1;
5718 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
5722 ("defining explicit specialization %qD in friend declaration",
5726 tree fns = TREE_OPERAND (orig_declarator, 0);
5727 tree args = TREE_OPERAND (orig_declarator, 1);
5729 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
5731 /* Something like `template <class T> friend void f<T>()'. */
5732 error ("invalid use of template-id %qD in declaration "
5733 "of primary template",
5739 /* A friend declaration of the form friend void f<>(). Record
5740 the information in the TEMPLATE_ID_EXPR. */
5741 SET_DECL_IMPLICIT_INSTANTIATION (decl);
5743 if (TREE_CODE (fns) == COMPONENT_REF)
5745 /* Due to bison parser ickiness, we will have already looked
5746 up an operator_name or PFUNCNAME within the current class
5747 (see template_id in parse.y). If the current class contains
5748 such a name, we'll get a COMPONENT_REF here. Undo that. */
5750 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
5751 == current_class_type);
5752 fns = TREE_OPERAND (fns, 1);
5754 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
5755 || TREE_CODE (fns) == OVERLOAD);
5756 DECL_TEMPLATE_INFO (decl) = tree_cons (fns, args, NULL_TREE);
5758 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
5759 if (TREE_PURPOSE (t)
5760 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
5762 error ("default arguments are not allowed in declaration "
5763 "of friend template specialization %qD",
5770 error ("%<inline%> is not allowed in declaration of friend "
5771 "template specialization %qD",
5778 /* If this decl has namespace scope, set that up. */
5780 set_decl_namespace (decl, in_namespace, friendp);
5782 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
5784 /* `main' and builtins have implicit 'C' linkage. */
5785 if ((MAIN_NAME_P (declarator)
5786 || (IDENTIFIER_LENGTH (declarator) > 10
5787 && IDENTIFIER_POINTER (declarator)[0] == '_'
5788 && IDENTIFIER_POINTER (declarator)[1] == '_'
5789 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
5790 && current_lang_name == lang_name_cplusplus
5791 && ctype == NULL_TREE
5792 /* NULL_TREE means global namespace. */
5793 && DECL_CONTEXT (decl) == NULL_TREE)
5794 SET_DECL_LANGUAGE (decl, lang_c);
5796 /* Should probably propagate const out from type to decl I bet (mrs). */
5799 DECL_STATIC_FUNCTION_P (decl) = 1;
5800 DECL_CONTEXT (decl) = ctype;
5805 DECL_CONTEXT (decl) = ctype;
5807 check_class_member_definition_namespace (decl);
5810 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
5812 if (processing_template_decl)
5813 error ("cannot declare %<::main%> to be a template");
5815 error ("cannot declare %<::main%> to be inline");
5817 error ("cannot declare %<::main%> to be static");
5818 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
5821 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
5823 error ("%<::main%> must return %<int%>");
5824 newtype = build_function_type (integer_type_node,
5826 TREE_TYPE (decl) = newtype;
5832 /* Members of anonymous types and local classes have no linkage; make
5833 them internal. If a typedef is made later, this will be changed. */
5834 if (ctype && (TYPE_ANONYMOUS_P (ctype)
5835 || decl_function_context (TYPE_MAIN_DECL (ctype))))
5840 /* [basic.link]: A name with no linkage (notably, the name of a class
5841 or enumeration declared in a local scope) shall not be used to
5842 declare an entity with linkage.
5844 Only check this for public decls for now. See core 319, 389. */
5845 t = no_linkage_check (TREE_TYPE (decl),
5846 /*relaxed_p=*/false);
5849 if (TYPE_ANONYMOUS_P (t))
5851 if (DECL_EXTERN_C_P (decl))
5852 /* Allow this; it's pretty common in C. */;
5855 pedwarn ("non-local function %q#D uses anonymous type",
5857 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
5858 pedwarn ("%q+#D does not refer to the unqualified "
5859 "type, so it is not used for linkage",
5864 pedwarn ("non-local function %q#D uses local type %qT", decl, t);
5868 TREE_PUBLIC (decl) = publicp;
5871 DECL_INTERFACE_KNOWN (decl) = 1;
5872 DECL_NOT_REALLY_EXTERN (decl) = 1;
5875 /* If the declaration was declared inline, mark it as such. */
5877 DECL_DECLARED_INLINE_P (decl) = 1;
5878 /* We inline functions that are explicitly declared inline, or, when
5879 the user explicitly asks us to, all functions. */
5880 if (DECL_DECLARED_INLINE_P (decl)
5881 || (flag_inline_trees == 2 && !DECL_INLINE (decl) && funcdef_flag))
5882 DECL_INLINE (decl) = 1;
5884 DECL_EXTERNAL (decl) = 1;
5885 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
5887 error ("%smember function %qD cannot have cv-qualifier",
5888 (ctype ? "static " : "non-"), decl);
5889 quals = TYPE_UNQUALIFIED;
5892 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl)))
5893 grok_op_properties (decl, /*complain=*/true);
5895 if (ctype && decl_function_context (decl))
5896 DECL_NO_STATIC_CHAIN (decl) = 1;
5899 /* Make the init_value nonzero so pushdecl knows this is not
5900 tentative. error_mark_node is replaced later with the BLOCK. */
5901 DECL_INITIAL (decl) = error_mark_node;
5903 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
5904 TREE_NOTHROW (decl) = 1;
5906 /* Caller will do the rest of this. */
5910 if (ctype != NULL_TREE)
5912 if (sfk == sfk_constructor)
5913 DECL_CONSTRUCTOR_P (decl) = 1;
5915 grokclassfn (ctype, decl, flags, quals);
5918 decl = check_explicit_specialization (orig_declarator, decl,
5921 4 * (friendp != 0));
5922 if (decl == error_mark_node)
5927 cplus_decl_attributes (&decl, *attrlist, 0);
5928 *attrlist = NULL_TREE;
5931 if (ctype != NULL_TREE
5932 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
5937 old_decl = check_classfn (ctype, decl,
5938 (processing_template_decl
5939 > template_class_depth (ctype))
5940 ? current_template_parms
5947 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
5948 /* Because grokfndecl is always supposed to return a
5949 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
5950 here. We depend on our callers to figure out that its
5951 really a template that's being returned. */
5952 old_decl = DECL_TEMPLATE_RESULT (old_decl);
5954 if (DECL_STATIC_FUNCTION_P (old_decl)
5955 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
5956 /* Remove the `this' parm added by grokclassfn.
5957 XXX Isn't this done in start_function, too? */
5958 revert_static_member_fn (decl);
5959 if (DECL_ARTIFICIAL (old_decl))
5960 error ("definition of implicitly-declared %qD", old_decl);
5962 /* Since we've smashed OLD_DECL to its
5963 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
5964 if (TREE_CODE (decl) == TEMPLATE_DECL)
5965 decl = DECL_TEMPLATE_RESULT (decl);
5967 /* Attempt to merge the declarations. This can fail, in
5968 the case of some invalid specialization declarations. */
5969 pushed_scope = push_scope (ctype);
5970 ok = duplicate_decls (decl, old_decl, friendp);
5972 pop_scope (pushed_scope);
5975 error ("no %q#D member function declared in class %qT",
5983 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
5986 if (ctype == NULL_TREE || check)
5990 DECL_VIRTUAL_P (decl) = 1;
5995 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
5996 the linkage that DECL will receive in the object file. */
5999 set_linkage_for_static_data_member (tree decl)
6001 /* A static data member always has static storage duration and
6002 external linkage. Note that static data members are forbidden in
6003 local classes -- the only situation in which a class has
6004 non-external linkage. */
6005 TREE_PUBLIC (decl) = 1;
6006 TREE_STATIC (decl) = 1;
6007 /* For non-template classes, static data members are always put
6008 out in exactly those files where they are defined, just as
6009 with ordinary namespace-scope variables. */
6010 if (!processing_template_decl)
6011 DECL_INTERFACE_KNOWN (decl) = 1;
6014 /* Create a VAR_DECL named NAME with the indicated TYPE.
6016 If SCOPE is non-NULL, it is the class type or namespace containing
6017 the variable. If SCOPE is NULL, the variable should is created in
6018 the innermost enclosings scope. */
6021 grokvardecl (tree type,
6023 const cp_decl_specifier_seq *declspecs,
6029 tree explicit_scope;
6031 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
6033 /* Compute the scope in which to place the variable, but remember
6034 whether or not that scope was explicitly specified by the user. */
6035 explicit_scope = scope;
6038 /* An explicit "extern" specifier indicates a namespace-scope
6040 if (declspecs->storage_class == sc_extern)
6041 scope = current_namespace;
6042 else if (!at_function_scope_p ())
6043 scope = current_scope ();
6047 && (/* If the variable is a namespace-scope variable declared in a
6048 template, we need DECL_LANG_SPECIFIC. */
6049 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
6050 /* Similarly for namespace-scope variables with language linkage
6052 || (TREE_CODE (scope) == NAMESPACE_DECL
6053 && current_lang_name != lang_name_cplusplus)
6054 /* Similarly for static data members. */
6056 decl = build_lang_decl (VAR_DECL, name, type);
6058 decl = build_decl (VAR_DECL, name, type);
6060 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
6061 set_decl_namespace (decl, explicit_scope, 0);
6063 DECL_CONTEXT (decl) = scope;
6065 if (declspecs->storage_class == sc_extern)
6067 DECL_THIS_EXTERN (decl) = 1;
6068 DECL_EXTERNAL (decl) = !initialized;
6071 if (DECL_CLASS_SCOPE_P (decl))
6073 set_linkage_for_static_data_member (decl);
6074 /* This function is only called with out-of-class definitions. */
6075 DECL_EXTERNAL (decl) = 0;
6076 check_class_member_definition_namespace (decl);
6078 /* At top level, either `static' or no s.c. makes a definition
6079 (perhaps tentative), and absence of `static' makes it public. */
6080 else if (toplevel_bindings_p ())
6082 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
6083 && (DECL_THIS_EXTERN (decl) || ! constp));
6084 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
6086 /* Not at top level, only `static' makes a static definition. */
6089 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
6090 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
6093 if (declspecs->specs[(int)ds_thread])
6095 if (targetm.have_tls)
6096 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
6098 /* A mere warning is sure to result in improper semantics
6099 at runtime. Don't bother to allow this to compile. */
6100 error ("thread-local storage not supported for this target");
6103 if (TREE_PUBLIC (decl))
6105 /* [basic.link]: A name with no linkage (notably, the name of a class
6106 or enumeration declared in a local scope) shall not be used to
6107 declare an entity with linkage.
6109 Only check this for public decls for now. */
6110 tree t = no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false);
6113 if (TYPE_ANONYMOUS_P (t))
6115 if (DECL_EXTERN_C_P (decl))
6116 /* Allow this; it's pretty common in C. */
6120 /* DRs 132, 319 and 389 seem to indicate types with
6121 no linkage can only be used to declare extern "C"
6122 entities. Since it's not always an error in the
6123 ISO C++ 90 Standard, we only issue a warning. */
6124 warning (0, "non-local variable %q#D uses anonymous type",
6126 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
6127 warning (0, "%q+#D does not refer to the unqualified "
6128 "type, so it is not used for linkage",
6133 warning (0, "non-local variable %q#D uses local type %qT", decl, t);
6137 DECL_INTERFACE_KNOWN (decl) = 1;
6142 /* Create and return a canonical pointer to member function type, for
6143 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
6146 build_ptrmemfunc_type (tree type)
6150 tree unqualified_variant = NULL_TREE;
6152 if (type == error_mark_node)
6155 /* If a canonical type already exists for this type, use it. We use
6156 this method instead of type_hash_canon, because it only does a
6157 simple equality check on the list of field members. */
6159 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
6162 /* Make sure that we always have the unqualified pointer-to-member
6164 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
6166 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
6168 t = make_aggr_type (RECORD_TYPE);
6169 xref_basetypes (t, NULL_TREE);
6171 /* Let the front-end know this is a pointer to member function... */
6172 TYPE_PTRMEMFUNC_FLAG (t) = 1;
6173 /* ... and not really an aggregate. */
6174 SET_IS_AGGR_TYPE (t, 0);
6176 field = build_decl (FIELD_DECL, pfn_identifier, type);
6179 field = build_decl (FIELD_DECL, delta_identifier, delta_type_node);
6180 TREE_CHAIN (field) = fields;
6183 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
6185 /* Zap out the name so that the back-end will give us the debugging
6186 information for this anonymous RECORD_TYPE. */
6187 TYPE_NAME (t) = NULL_TREE;
6189 /* If this is not the unqualified form of this pointer-to-member
6190 type, set the TYPE_MAIN_VARIANT for this type to be the
6191 unqualified type. Since they are actually RECORD_TYPEs that are
6192 not variants of each other, we must do this manually. */
6193 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
6195 t = build_qualified_type (t, cp_type_quals (type));
6196 TYPE_MAIN_VARIANT (t) = unqualified_variant;
6197 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
6198 TYPE_NEXT_VARIANT (unqualified_variant) = t;
6201 /* Cache this pointer-to-member type so that we can find it again
6203 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
6208 /* Create and return a pointer to data member type. */
6211 build_ptrmem_type (tree class_type, tree member_type)
6213 if (TREE_CODE (member_type) == METHOD_TYPE)
6217 arg_types = TYPE_ARG_TYPES (member_type);
6218 class_type = (cp_build_qualified_type
6220 cp_type_quals (TREE_TYPE (TREE_VALUE (arg_types)))));
6222 = build_method_type_directly (class_type,
6223 TREE_TYPE (member_type),
6224 TREE_CHAIN (arg_types));
6225 return build_ptrmemfunc_type (build_pointer_type (member_type));
6229 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
6230 return build_offset_type (class_type, member_type);
6234 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
6235 Check to see that the definition is valid. Issue appropriate error
6236 messages. Return 1 if the definition is particularly bad, or 0
6240 check_static_variable_definition (tree decl, tree type)
6242 /* Motion 10 at San Diego: If a static const integral data member is
6243 initialized with an integral constant expression, the initializer
6244 may appear either in the declaration (within the class), or in
6245 the definition, but not both. If it appears in the class, the
6246 member is a member constant. The file-scope definition is always
6248 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
6250 error ("invalid in-class initialization of static data member "
6251 "of non-integral type %qT",
6253 /* If we just return the declaration, crashes will sometimes
6254 occur. We therefore return void_type_node, as if this were a
6255 friend declaration, to cause callers to completely ignore
6256 this declaration. */
6259 else if (!CP_TYPE_CONST_P (type))
6260 error ("ISO C++ forbids in-class initialization of non-const "
6261 "static member %qD",
6263 else if (pedantic && !INTEGRAL_TYPE_P (type))
6264 pedwarn ("ISO C++ forbids initialization of member constant "
6265 "%qD of non-integral type %qT", decl, type);
6270 /* Given the SIZE (i.e., number of elements) in an array, compute an
6271 appropriate index type for the array. If non-NULL, NAME is the
6272 name of the thing being declared. */
6275 compute_array_index_type (tree name, tree size)
6277 tree type = TREE_TYPE (size);
6280 /* The array bound must be an integer type. */
6281 if (!dependent_type_p (type) && !INTEGRAL_TYPE_P (type))
6284 error ("size of array %qD has non-integral type %qT", name, type);
6286 error ("size of array has non-integral type %qT", type);
6287 size = integer_one_node;
6288 type = TREE_TYPE (size);
6291 if (abi_version_at_least (2)
6292 /* We should only handle value dependent expressions specially. */
6293 ? value_dependent_expression_p (size)
6294 /* But for abi-1, we handled all instances in templates. This
6295 effects the manglings produced. */
6296 : processing_template_decl)
6297 return build_index_type (build_min (MINUS_EXPR, sizetype,
6298 size, integer_one_node));
6300 /* The size might be the result of a cast. */
6301 STRIP_TYPE_NOPS (size);
6303 /* It might be a const variable or enumeration constant. */
6304 size = integral_constant_value (size);
6306 /* Normally, the array-bound will be a constant. */
6307 if (TREE_CODE (size) == INTEGER_CST)
6309 /* Check to see if the array bound overflowed. Make that an
6310 error, no matter how generous we're being. */
6311 int old_flag_pedantic_errors = flag_pedantic_errors;
6312 int old_pedantic = pedantic;
6313 pedantic = flag_pedantic_errors = 1;
6314 constant_expression_warning (size);
6315 pedantic = old_pedantic;
6316 flag_pedantic_errors = old_flag_pedantic_errors;
6318 /* An array must have a positive number of elements. */
6319 if (INT_CST_LT (size, integer_zero_node))
6322 error ("size of array %qD is negative", name);
6324 error ("size of array is negative");
6325 size = integer_one_node;
6327 /* As an extension we allow zero-sized arrays. We always allow
6328 them in system headers because glibc uses them. */
6329 else if (integer_zerop (size) && pedantic && !in_system_header)
6332 pedwarn ("ISO C++ forbids zero-size array %qD", name);
6334 pedwarn ("ISO C++ forbids zero-size array");
6337 else if (TREE_CONSTANT (size))
6339 /* `(int) &fn' is not a valid array bound. */
6341 error ("size of array %qD is not an integral constant-expression",
6344 error ("size of array is not an integral constant-expression");
6345 size = integer_one_node;
6350 pedwarn ("ISO C++ forbids variable-size array %qD", name);
6352 pedwarn ("ISO C++ forbids variable-size array");
6355 if (processing_template_decl && !TREE_CONSTANT (size))
6356 /* A variable sized array. */
6357 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
6360 HOST_WIDE_INT saved_processing_template_decl;
6362 /* Compute the index of the largest element in the array. It is
6363 one less than the number of elements in the array. We save
6364 and restore PROCESSING_TEMPLATE_DECL so that computations in
6365 cp_build_binary_op will be appropriately folded. */
6366 saved_processing_template_decl = processing_template_decl;
6367 processing_template_decl = 0;
6368 itype = cp_build_binary_op (MINUS_EXPR,
6369 cp_convert (ssizetype, size),
6370 cp_convert (ssizetype, integer_one_node));
6371 itype = fold (itype);
6372 processing_template_decl = saved_processing_template_decl;
6374 if (!TREE_CONSTANT (itype))
6375 /* A variable sized array. */
6376 itype = variable_size (itype);
6377 /* Make sure that there was no overflow when creating to a signed
6378 index type. (For example, on a 32-bit machine, an array with
6379 size 2^32 - 1 is too big.) */
6380 else if (TREE_CODE (itype) == INTEGER_CST
6381 && TREE_OVERFLOW (itype))
6383 error ("overflow in array dimension");
6384 TREE_OVERFLOW (itype) = 0;
6388 /* Create and return the appropriate index type. */
6389 return build_index_type (itype);
6392 /* Returns the scope (if any) in which the entity declared by
6393 DECLARATOR will be located. If the entity was declared with an
6394 unqualified name, NULL_TREE is returned. */
6397 get_scope_of_declarator (const cp_declarator *declarator)
6399 while (declarator && declarator->kind != cdk_id)
6400 declarator = declarator->declarator;
6402 /* If the declarator-id is a SCOPE_REF, the scope in which the
6403 declaration occurs is the first operand. */
6405 && declarator->u.id.qualifying_scope)
6406 return declarator->u.id.qualifying_scope;
6408 /* Otherwise, the declarator is not a qualified name; the entity will
6409 be declared in the current scope. */
6413 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
6414 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
6418 create_array_type_for_decl (tree name, tree type, tree size)
6420 tree itype = NULL_TREE;
6421 const char* error_msg;
6423 /* If things have already gone awry, bail now. */
6424 if (type == error_mark_node || size == error_mark_node)
6425 return error_mark_node;
6427 /* Assume that everything will go OK. */
6430 /* There are some types which cannot be array elements. */
6431 switch (TREE_CODE (type))
6434 error_msg = "array of void";
6438 error_msg = "array of functions";
6441 case REFERENCE_TYPE:
6442 error_msg = "array of references";
6446 error_msg = "array of function members";
6453 /* If something went wrong, issue an error-message and return. */
6457 error ("declaration of %qD as %s", name, error_msg);
6459 error ("creating %s", error_msg);
6461 return error_mark_node;
6466 The constant expressions that specify the bounds of the arrays
6467 can be omitted only for the first member of the sequence. */
6468 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
6471 error ("declaration of %qD as multidimensional array must "
6472 "have bounds for all dimensions except the first",
6475 error ("multidimensional array must have bounds for all "
6476 "dimensions except the first");
6478 return error_mark_node;
6481 /* Figure out the index type for the array. */
6483 itype = compute_array_index_type (name, size);
6486 T is called the array element type; this type shall not be [...] an
6487 abstract class type. */
6488 abstract_virtuals_error (name, type);
6490 return build_cplus_array_type (type, itype);
6493 /* Check that it's OK to declare a function with the indicated TYPE.
6494 SFK indicates the kind of special function (if any) that this
6495 function is. OPTYPE is the type given in a conversion operator
6496 declaration, or the class type for a constructor/destructor.
6497 Returns the actual return type of the function; that
6498 may be different than TYPE if an error occurs, or for certain
6499 special functions. */
6502 check_special_function_return_type (special_function_kind sfk,
6508 case sfk_constructor:
6510 error ("return type specification for constructor invalid");
6512 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
6513 type = build_pointer_type (optype);
6515 type = void_type_node;
6518 case sfk_destructor:
6520 error ("return type specification for destructor invalid");
6521 /* We can't use the proper return type here because we run into
6522 problems with ambiguous bases and covariant returns.
6523 Java classes are left unchanged because (void *) isn't a valid
6524 Java type, and we don't want to change the Java ABI. */
6525 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
6526 type = build_pointer_type (void_type_node);
6528 type = void_type_node;
6531 case sfk_conversion:
6532 if (type && !same_type_p (type, optype))
6533 error ("operator %qT declared to return %qT", optype, type);
6535 pedwarn ("return type specified for %<operator %T%>", optype);
6546 /* A variable or data member (whose unqualified name is IDENTIFIER)
6547 has been declared with the indicated TYPE. If the TYPE is not
6548 acceptable, issue an error message and return a type to use for
6549 error-recovery purposes. */
6552 check_var_type (tree identifier, tree type)
6554 if (VOID_TYPE_P (type))
6557 error ("unnamed variable or field declared void");
6558 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
6560 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
6561 error ("variable or field %qE declared void", identifier);
6564 error ("variable or field declared void");
6565 type = integer_type_node;
6571 /* Given declspecs and a declarator (abstract or otherwise), determine
6572 the name and type of the object declared and construct a DECL node
6575 DECLSPECS is a chain of tree_list nodes whose value fields
6576 are the storage classes and type specifiers.
6578 DECL_CONTEXT says which syntactic context this declaration is in:
6579 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
6580 FUNCDEF for a function definition. Like NORMAL but a few different
6581 error messages in each case. Return value may be zero meaning
6582 this definition is too screwy to try to parse.
6583 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
6584 handle member functions (which have FIELD context).
6585 Return value may be zero meaning this definition is too screwy to
6587 PARM for a parameter declaration (either within a function prototype
6588 or before a function body). Make a PARM_DECL, or return void_type_node.
6589 CATCHPARM for a parameter declaration before a catch clause.
6590 TYPENAME if for a typename (in a cast or sizeof).
6591 Don't make a DECL node; just return the ..._TYPE node.
6592 FIELD for a struct or union field; make a FIELD_DECL.
6593 BITFIELD for a field with specified width.
6594 INITIALIZED is 1 if the decl has an initializer.
6596 ATTRLIST is a pointer to the list of attributes, which may be NULL
6597 if there are none; *ATTRLIST may be modified if attributes from inside
6598 the declarator should be applied to the declaration.
6600 When this function is called, scoping variables (such as
6601 CURRENT_CLASS_TYPE) should reflect the scope in which the
6602 declaration occurs, not the scope in which the new declaration will
6603 be placed. For example, on:
6607 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
6608 should not be `S'. */
6611 grokdeclarator (const cp_declarator *declarator,
6612 const cp_decl_specifier_seq *declspecs,
6613 enum decl_context decl_context,
6617 tree type = NULL_TREE;
6620 int virtualp, explicitp, friendp, inlinep, staticp;
6621 int explicit_int = 0;
6622 int explicit_char = 0;
6623 int defaulted_int = 0;
6624 tree dependant_name = NULL_TREE;
6626 tree typedef_decl = NULL_TREE;
6627 const char *name = NULL;
6628 tree typedef_type = NULL_TREE;
6629 /* True if this declarator is a function definition. */
6630 bool funcdef_flag = false;
6631 cp_declarator_kind innermost_code = cdk_error;
6634 /* See the code below that used this. */
6635 tree decl_attr = NULL_TREE;
6638 /* Keep track of what sort of function is being processed
6639 so that we can warn about default return values, or explicit
6640 return values which do not match prescribed defaults. */
6641 special_function_kind sfk = sfk_none;
6643 tree dname = NULL_TREE;
6644 tree ctor_return_type = NULL_TREE;
6645 enum overload_flags flags = NO_SPECIAL;
6646 cp_cv_quals quals = TYPE_UNQUALIFIED;
6647 tree raises = NULL_TREE;
6648 int template_count = 0;
6649 tree returned_attrs = NULL_TREE;
6650 tree parms = NULL_TREE;
6651 const cp_declarator *id_declarator;
6652 /* The unqualified name of the declarator; either an
6653 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
6654 tree unqualified_id;
6655 /* The class type, if any, in which this entity is located,
6656 or NULL_TREE if none. Note that this value may be different from
6657 the current class type; for example if an attempt is made to declare
6658 "A::f" inside "B", this value will be "A". */
6659 tree ctype = current_class_type;
6660 /* The NAMESPACE_DECL for the namespace in which this entity is
6661 located. If an unqualified name is used to declare the entity,
6662 this value will be NULL_TREE, even if the entity is located at
6664 tree in_namespace = NULL_TREE;
6665 cp_storage_class storage_class;
6666 bool unsigned_p, signed_p, short_p, long_p, thread_p;
6667 bool type_was_error_mark_node = false;
6669 signed_p = declspecs->specs[(int)ds_signed];
6670 unsigned_p = declspecs->specs[(int)ds_unsigned];
6671 short_p = declspecs->specs[(int)ds_short];
6672 long_p = declspecs->specs[(int)ds_long];
6673 longlong = declspecs->specs[(int)ds_long] >= 2;
6674 thread_p = declspecs->specs[(int)ds_thread];
6676 if (decl_context == FUNCDEF)
6677 funcdef_flag = true, decl_context = NORMAL;
6678 else if (decl_context == MEMFUNCDEF)
6679 funcdef_flag = true, decl_context = FIELD;
6680 else if (decl_context == BITFIELD)
6681 bitfield = 1, decl_context = FIELD;
6683 /* Look inside a declarator for the name being declared
6684 and get it as a string, for an error message. */
6685 for (id_declarator = declarator;
6687 id_declarator = id_declarator->declarator)
6689 if (id_declarator->kind != cdk_id)
6690 innermost_code = id_declarator->kind;
6692 switch (id_declarator->kind)
6695 if (id_declarator->declarator
6696 && id_declarator->declarator->kind == cdk_id)
6698 sfk = id_declarator->declarator->u.id.sfk;
6699 if (sfk == sfk_destructor)
6706 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
6707 tree decl = id_declarator->u.id.unqualified_name;
6710 if (qualifying_scope)
6712 if (TYPE_P (qualifying_scope))
6714 ctype = qualifying_scope;
6715 if (innermost_code != cdk_function
6716 && current_class_type
6717 && !UNIQUELY_DERIVED_FROM_P (ctype,
6718 current_class_type))
6720 error ("type %qT is not derived from type %qT",
6721 ctype, current_class_type);
6722 return error_mark_node;
6725 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
6726 in_namespace = qualifying_scope;
6728 switch (TREE_CODE (decl))
6734 if (innermost_code != cdk_function)
6736 error ("declaration of %qD as non-function", decl);
6737 return error_mark_node;
6739 else if (!qualifying_scope
6740 && !(current_class_type && at_class_scope_p ()))
6742 error ("declaration of %qD as non-member", decl);
6743 return error_mark_node;
6746 type = TREE_OPERAND (decl, 0);
6747 name = IDENTIFIER_POINTER (constructor_name (type));
6752 case TEMPLATE_ID_EXPR:
6754 tree fns = TREE_OPERAND (decl, 0);
6757 if (TREE_CODE (dname) == COMPONENT_REF)
6758 dname = TREE_OPERAND (dname, 1);
6759 if (TREE_CODE (dname) != IDENTIFIER_NODE)
6761 gcc_assert (is_overloaded_fn (dname));
6762 dname = DECL_NAME (get_first_fn (dname));
6767 case IDENTIFIER_NODE:
6768 if (TREE_CODE (decl) == IDENTIFIER_NODE)
6771 if (C_IS_RESERVED_WORD (dname))
6773 error ("declarator-id missing; using reserved word %qD",
6775 name = IDENTIFIER_POINTER (dname);
6777 else if (!IDENTIFIER_TYPENAME_P (dname))
6778 name = IDENTIFIER_POINTER (dname);
6781 gcc_assert (flags == NO_SPECIAL);
6782 flags = TYPENAME_FLAG;
6783 ctor_return_type = TREE_TYPE (dname);
6784 sfk = sfk_conversion;
6785 if (is_typename_at_global_scope (dname))
6786 name = IDENTIFIER_POINTER (dname);
6788 name = "<invalid operator>";
6810 if (id_declarator->kind == cdk_id)
6814 /* A function definition's declarator must have the form of
6815 a function declarator. */
6817 if (funcdef_flag && innermost_code != cdk_function)
6820 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
6821 && innermost_code != cdk_function
6822 && ! (ctype && !declspecs->any_specifiers_p))
6824 error ("declaration of %qD as non-function", dname);
6825 return error_mark_node;
6828 /* Anything declared one level down from the top level
6829 must be one of the parameters of a function
6830 (because the body is at least two levels down). */
6832 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
6833 by not allowing C++ class definitions to specify their parameters
6834 with xdecls (must be spec.d in the parmlist).
6836 Since we now wait to push a class scope until we are sure that
6837 we are in a legitimate method context, we must set oldcname
6838 explicitly (since current_class_name is not yet alive).
6840 We also want to avoid calling this a PARM if it is in a namespace. */
6842 if (decl_context == NORMAL && !toplevel_bindings_p ())
6844 struct cp_binding_level *b = current_binding_level;
6845 current_binding_level = b->level_chain;
6846 if (current_binding_level != 0 && toplevel_bindings_p ())
6847 decl_context = PARM;
6848 current_binding_level = b;
6852 name = decl_context == PARM ? "parameter" : "type name";
6854 /* If there were multiple types specified in the decl-specifier-seq,
6855 issue an error message. */
6856 if (declspecs->multiple_types_p)
6857 error ("two or more data types in declaration of %qs", name);
6858 /* Extract the basic type from the decl-specifier-seq. */
6859 type = declspecs->type;
6860 if (type == error_mark_node)
6863 type_was_error_mark_node = true;
6865 /* If the entire declaration is itself tagged as deprecated then
6866 suppress reports of deprecated items. */
6867 if (type && TREE_DEPRECATED (type)
6868 && deprecated_state != DEPRECATED_SUPPRESS)
6869 warn_deprecated_use (type);
6870 if (type && TREE_CODE (type) == TYPE_DECL)
6872 typedef_decl = type;
6873 type = TREE_TYPE (typedef_decl);
6875 /* No type at all: default to `int', and set DEFAULTED_INT
6876 because it was not a user-defined typedef. */
6877 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
6879 /* These imply 'int'. */
6880 type = integer_type_node;
6884 explicit_int = declspecs->explicit_int_p;
6885 explicit_char = declspecs->explicit_char_p;
6888 /* See the code below that used this. */
6890 decl_attr = DECL_ATTRIBUTES (typedef_decl);
6892 typedef_type = type;
6895 if (sfk != sfk_conversion)
6896 ctor_return_type = ctype;
6898 if (sfk != sfk_none)
6899 type = check_special_function_return_type (sfk, type,
6901 else if (type == NULL_TREE)
6907 /* We handle `main' specially here, because 'main () { }' is so
6908 common. With no options, it is allowed. With -Wreturn-type,
6909 it is a warning. It is only an error with -pedantic-errors. */
6910 is_main = (funcdef_flag
6911 && dname && MAIN_NAME_P (dname)
6912 && ctype == NULL_TREE
6913 && in_namespace == NULL_TREE
6914 && current_namespace == global_namespace);
6916 if (type_was_error_mark_node)
6917 /* We've already issued an error, don't complain more. */;
6918 else if (in_system_header || flag_ms_extensions)
6919 /* Allow it, sigh. */;
6920 else if (pedantic || ! is_main)
6921 pedwarn ("ISO C++ forbids declaration of %qs with no type", name);
6922 else if (warn_return_type)
6923 warning (0, "ISO C++ forbids declaration of %qs with no type", name);
6925 type = integer_type_node;
6930 /* Now process the modifiers that were specified
6931 and check for invalid combinations. */
6933 /* Long double is a special combination. */
6934 if (long_p && TYPE_MAIN_VARIANT (type) == double_type_node)
6937 type = build_qualified_type (long_double_type_node,
6938 cp_type_quals (type));
6941 /* Check all other uses of type modifiers. */
6943 if (unsigned_p || signed_p || long_p || short_p)
6947 if (TREE_CODE (type) == REAL_TYPE)
6948 error ("short, signed or unsigned invalid for %qs", name);
6949 else if (TREE_CODE (type) != INTEGER_TYPE)
6950 error ("long, short, signed or unsigned invalid for %qs", name);
6951 else if (long_p && short_p)
6952 error ("long and short specified together for %qs", name);
6953 else if ((long_p || short_p) && explicit_char)
6954 error ("long or short specified with char for %qs", name);
6955 else if ((long_p|| short_p) && TREE_CODE (type) == REAL_TYPE)
6956 error ("long or short specified with floating type for %qs", name);
6957 else if (signed_p && unsigned_p)
6958 error ("signed and unsigned given together for %qs", name);
6962 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
6964 pedwarn ("long, short, signed or unsigned used invalidly for %qs",
6966 if (flag_pedantic_errors)
6971 /* Discard the type modifiers if they are invalid. */
6982 /* Decide whether an integer type is signed or not.
6983 Optionally treat bitfields as signed by default. */
6987 It is implementation-defined whether a plain (neither
6988 explicitly signed or unsigned) char, short, int, or long
6989 bit-field is signed or unsigned.
6991 Naturally, we extend this to long long as well. Note that
6992 this does not include wchar_t. */
6993 || (bitfield && !flag_signed_bitfields
6995 /* A typedef for plain `int' without `signed' can be
6996 controlled just like plain `int', but a typedef for
6997 `signed int' cannot be so controlled. */
6999 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
7000 && TREE_CODE (type) == INTEGER_TYPE
7001 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
7004 type = long_long_unsigned_type_node;
7006 type = long_unsigned_type_node;
7008 type = short_unsigned_type_node;
7009 else if (type == char_type_node)
7010 type = unsigned_char_type_node;
7011 else if (typedef_decl)
7012 type = c_common_unsigned_type (type);
7014 type = unsigned_type_node;
7016 else if (signed_p && type == char_type_node)
7017 type = signed_char_type_node;
7019 type = long_long_integer_type_node;
7021 type = long_integer_type_node;
7023 type = short_integer_type_node;
7025 if (declspecs->specs[(int)ds_complex])
7027 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
7028 error ("complex invalid for %qs", name);
7029 /* If we just have "complex", it is equivalent to
7030 "complex double", but if any modifiers at all are specified it is
7031 the complex form of TYPE. E.g, "complex short" is
7032 "complex short int". */
7034 else if (defaulted_int && ! longlong
7035 && ! (long_p || short_p || signed_p || unsigned_p))
7036 type = complex_double_type_node;
7037 else if (type == integer_type_node)
7038 type = complex_integer_type_node;
7039 else if (type == float_type_node)
7040 type = complex_float_type_node;
7041 else if (type == double_type_node)
7042 type = complex_double_type_node;
7043 else if (type == long_double_type_node)
7044 type = complex_long_double_type_node;
7046 type = build_complex_type (type);
7049 type_quals = TYPE_UNQUALIFIED;
7050 if (declspecs->specs[(int)ds_const])
7051 type_quals |= TYPE_QUAL_CONST;
7052 if (declspecs->specs[(int)ds_volatile])
7053 type_quals |= TYPE_QUAL_VOLATILE;
7054 if (declspecs->specs[(int)ds_restrict])
7055 type_quals |= TYPE_QUAL_RESTRICT;
7056 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
7057 error ("qualifiers are not allowed on declaration of %<operator %T%>",
7060 if (TREE_CODE (type) == FUNCTION_TYPE
7061 && type_quals != TYPE_UNQUALIFIED)
7063 /* This was an error in C++98 (cv-qualifiers cannot be added to
7064 a function type), but DR 295 makes the code well-formed by
7065 dropping the extra qualifiers. */
7068 tree bad_type = build_qualified_type (type, type_quals);
7069 pedwarn ("ignoring %qV qualifiers added to function type %qT",
7072 type_quals = TYPE_UNQUALIFIED;
7074 type_quals |= cp_type_quals (type);
7075 type = cp_build_qualified_type_real
7076 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
7077 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
7078 /* We might have ignored or rejected some of the qualifiers. */
7079 type_quals = cp_type_quals (type);
7082 inlinep = !! declspecs->specs[(int)ds_inline];
7083 virtualp = !! declspecs->specs[(int)ds_virtual];
7084 explicitp = !! declspecs->specs[(int)ds_explicit];
7086 storage_class = declspecs->storage_class;
7087 if (storage_class == sc_static)
7088 staticp = 1 + (decl_context == FIELD);
7090 if (virtualp && staticp == 2)
7092 error ("member %qD cannot be declared both virtual and static", dname);
7093 storage_class = sc_none;
7096 friendp = !! declspecs->specs[(int)ds_friend];
7098 if (dependant_name && !friendp)
7100 error ("%<%T::%D%> is not a valid declarator", ctype, dependant_name);
7101 return void_type_node;
7104 /* Issue errors about use of storage classes for parameters. */
7105 if (decl_context == PARM)
7107 if (declspecs->specs[(int)ds_typedef])
7108 error ("typedef declaration invalid in parameter declaration");
7109 else if (storage_class == sc_static
7110 || storage_class == sc_extern
7112 error ("storage class specifiers invalid in parameter declarations");
7115 /* Give error if `virtual' is used outside of class declaration. */
7117 && (current_class_name == NULL_TREE || decl_context != FIELD))
7119 error ("virtual outside class declaration");
7123 /* Static anonymous unions are dealt with here. */
7124 if (staticp && decl_context == TYPENAME
7126 && ANON_AGGR_TYPE_P (declspecs->type))
7127 decl_context = FIELD;
7129 /* Warn about storage classes that are invalid for certain
7130 kinds of declarations (parameters, typenames, etc.). */
7131 if (declspecs->multiple_storage_classes_p)
7133 error ("multiple storage classes in declaration of %qs", name);
7134 storage_class = sc_none;
7138 && storage_class != sc_extern
7139 && storage_class != sc_static)
7140 || declspecs->specs[(int)ds_typedef]))
7142 error ("multiple storage classes in declaration of %qs", name);
7145 else if (decl_context != NORMAL
7146 && ((storage_class != sc_none
7147 && storage_class != sc_mutable)
7150 if ((decl_context == PARM || decl_context == CATCHPARM)
7151 && (storage_class == sc_register
7152 || storage_class == sc_auto))
7154 else if (declspecs->specs[(int)ds_typedef])
7156 else if (decl_context == FIELD
7157 /* C++ allows static class elements. */
7158 && storage_class == sc_static)
7159 /* C++ also allows inlines and signed and unsigned elements,
7160 but in those cases we don't come in here. */
7164 if (decl_context == FIELD)
7165 error ("storage class specified for %qs", name);
7168 if (decl_context == PARM || decl_context == CATCHPARM)
7169 error ("storage class specified for parameter %qs", name);
7171 error ("storage class specified for typename");
7173 if (storage_class == sc_register
7174 || storage_class == sc_auto
7175 || storage_class == sc_extern
7177 storage_class = sc_none;
7180 else if (storage_class == sc_extern && initialized
7183 if (toplevel_bindings_p ())
7185 /* It's common practice (and completely valid) to have a const
7186 be initialized and declared extern. */
7187 if (!(type_quals & TYPE_QUAL_CONST))
7188 warning (0, "%qs initialized and declared %<extern%>", name);
7191 error ("%qs has both %<extern%> and initializer", name);
7193 else if (storage_class == sc_extern && funcdef_flag
7194 && ! toplevel_bindings_p ())
7195 error ("nested function %qs declared %<extern%>", name);
7196 else if (toplevel_bindings_p ())
7198 if (storage_class == sc_auto)
7199 error ("top-level declaration of %qs specifies %<auto%>", name);
7202 && storage_class != sc_extern
7203 && storage_class != sc_static)
7205 error ("function-scope %qs implicitly auto and declared %<__thread%>",
7210 if (storage_class && friendp)
7211 error ("storage class specifiers invalid in friend function declarations");
7214 unqualified_id = NULL_TREE;
7217 unqualified_id = id_declarator->u.id.unqualified_name;
7218 switch (TREE_CODE (unqualified_id))
7222 = constructor_name (TREE_OPERAND (unqualified_id, 0));
7225 case IDENTIFIER_NODE:
7226 case TEMPLATE_ID_EXPR:
7234 /* Determine the type of the entity declared by recurring on the
7236 for (; declarator; declarator = declarator->declarator)
7238 const cp_declarator *inner_declarator;
7241 if (type == error_mark_node)
7242 return error_mark_node;
7244 attrs = declarator->attributes;
7250 if (declarator == NULL || declarator->kind == cdk_id)
7251 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
7252 if (declarator->kind == cdk_function)
7253 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
7254 if (declarator->kind == cdk_array)
7255 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
7256 returned_attrs = decl_attributes (&type,
7257 chainon (returned_attrs, attrs),
7261 if (declarator->kind == cdk_id)
7264 inner_declarator = declarator->declarator;
7266 switch (declarator->kind)
7269 type = create_array_type_for_decl (dname, type,
7270 declarator->u.array.bounds);
7278 /* Declaring a function type.
7279 Make sure we have a valid type for the function to return. */
7281 /* We now know that the TYPE_QUALS don't apply to the
7282 decl, but to its return type. */
7283 type_quals = TYPE_UNQUALIFIED;
7285 /* Warn about some types functions can't return. */
7287 if (TREE_CODE (type) == FUNCTION_TYPE)
7289 error ("%qs declared as function returning a function", name);
7290 type = integer_type_node;
7292 if (TREE_CODE (type) == ARRAY_TYPE)
7294 error ("%qs declared as function returning an array", name);
7295 type = integer_type_node;
7298 /* Pick up type qualifiers which should be applied to `this'. */
7299 quals = declarator->u.function.qualifiers;
7301 /* Pick up the exception specifications. */
7302 raises = declarator->u.function.exception_specification;
7304 /* Say it's a definition only for the CALL_EXPR
7305 closest to the identifier. */
7306 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
7308 if (ctype == NULL_TREE
7309 && decl_context == FIELD
7311 && (friendp == 0 || dname == current_class_name))
7312 ctype = current_class_type;
7314 if (ctype && (sfk == sfk_constructor
7315 || sfk == sfk_destructor))
7317 /* We are within a class's scope. If our declarator name
7318 is the same as the class name, and we are defining
7319 a function, then it is a constructor/destructor, and
7320 therefore returns a void type. */
7322 if (flags == DTOR_FLAG)
7324 /* ISO C++ 12.4/2. A destructor may not be
7325 declared const or volatile. A destructor may
7328 error ("destructor cannot be static member function");
7331 error ("destructors may not be cv-qualified");
7332 quals = TYPE_UNQUALIFIED;
7334 if (decl_context == FIELD)
7336 if (! member_function_or_else (ctype,
7339 return void_type_node;
7342 else /* It's a constructor. */
7346 /* ISO C++ 12.1. A constructor may not be
7347 declared const or volatile. A constructor may
7348 not be virtual. A constructor may not be
7351 error ("constructor cannot be static member function");
7354 pedwarn ("constructors cannot be declared virtual");
7359 error ("constructors may not be cv-qualified");
7360 quals = TYPE_UNQUALIFIED;
7362 if (decl_context == FIELD)
7364 if (! member_function_or_else (ctype,
7367 return void_type_node;
7368 TYPE_HAS_CONSTRUCTOR (ctype) = 1;
7369 if (sfk != sfk_constructor)
7373 if (decl_context == FIELD)
7379 error ("can't initialize friend function %qs", name);
7382 /* Cannot be both friend and virtual. */
7383 error ("virtual functions cannot be friends");
7386 if (decl_context == NORMAL)
7387 error ("friend declaration not in class definition");
7388 if (current_function_decl && funcdef_flag)
7389 error ("can't define friend function %qs in a local "
7394 arg_types = grokparms (declarator->u.function.parameters,
7397 if (inner_declarator
7398 && inner_declarator->kind == cdk_id
7399 && inner_declarator->u.id.sfk == sfk_destructor
7400 && arg_types != void_list_node)
7402 error ("destructors may not have parameters");
7403 arg_types = void_list_node;
7407 type = build_function_type (type, arg_types);
7408 type = cp_build_qualified_type (type, quals);
7415 /* Filter out pointers-to-references and references-to-references.
7416 We can get these if a TYPE_DECL is used. */
7418 if (TREE_CODE (type) == REFERENCE_TYPE)
7420 error (declarator->kind == cdk_reference
7421 ? "cannot declare reference to %q#T"
7422 : "cannot declare pointer to %q#T", type);
7423 type = TREE_TYPE (type);
7425 else if (VOID_TYPE_P (type))
7427 if (declarator->kind == cdk_reference)
7428 error ("cannot declare reference to %q#T", type);
7429 else if (declarator->kind == cdk_ptrmem)
7430 error ("cannot declare pointer to %q#T member", type);
7433 /* We now know that the TYPE_QUALS don't apply to the decl,
7434 but to the target of the pointer. */
7435 type_quals = TYPE_UNQUALIFIED;
7437 if (declarator->kind == cdk_ptrmem
7438 && (TREE_CODE (type) == FUNCTION_TYPE
7439 || (quals && TREE_CODE (type) == METHOD_TYPE)))
7443 /* If the type is a FUNCTION_TYPE, pick up the
7444 qualifiers from that function type. No other
7445 qualifiers may be supplied. */
7446 if (TREE_CODE (type) == FUNCTION_TYPE)
7447 quals = cp_type_quals (type);
7449 dummy = build_decl (TYPE_DECL, NULL_TREE, type);
7450 grok_method_quals (declarator->u.pointer.class_type,
7452 type = TREE_TYPE (dummy);
7453 quals = TYPE_UNQUALIFIED;
7456 if (declarator->kind == cdk_reference)
7458 if (!VOID_TYPE_P (type))
7459 type = build_reference_type (type);
7461 else if (TREE_CODE (type) == METHOD_TYPE)
7462 type = build_ptrmemfunc_type (build_pointer_type (type));
7463 else if (declarator->kind == cdk_ptrmem)
7465 /* We might have parsed a namespace as the class type. */
7466 if (TREE_CODE (declarator->u.pointer.class_type)
7469 error ("%qD is a namespace",
7470 declarator->u.pointer.class_type);
7471 type = build_pointer_type (type);
7473 else if (declarator->u.pointer.class_type == error_mark_node)
7474 /* We will already have complained. */
7475 type = error_mark_node;
7477 type = build_ptrmem_type (declarator->u.pointer.class_type,
7481 type = build_pointer_type (type);
7483 /* Process a list of type modifier keywords (such as
7484 const or volatile) that were given inside the `*' or `&'. */
7486 if (declarator->u.pointer.qualifiers)
7489 = cp_build_qualified_type (type,
7490 declarator->u.pointer.qualifiers);
7491 type_quals = cp_type_quals (type);
7504 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
7505 && TREE_CODE (type) != FUNCTION_TYPE
7506 && TREE_CODE (type) != METHOD_TYPE)
7508 error ("template-id %qD used as a declarator",
7510 unqualified_id = dname;
7513 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
7514 qualified with a class-name, turn it into a METHOD_TYPE, unless
7515 we know that the function is static. We take advantage of this
7516 opportunity to do other processing that pertains to entities
7517 explicitly declared to be class members. Note that if DECLARATOR
7518 is non-NULL, we know it is a cdk_id declarator; otherwise, we
7519 would not have exited the loop above. */
7521 && declarator->u.id.qualifying_scope
7522 && TYPE_P (declarator->u.id.qualifying_scope))
7526 ctype = declarator->u.id.qualifying_scope;
7527 ctype = TYPE_MAIN_VARIANT (ctype);
7529 while (t != NULL_TREE && CLASS_TYPE_P (t))
7531 /* You're supposed to have one `template <...>' for every
7532 template class, but you don't need one for a full
7533 specialization. For example:
7535 template <class T> struct S{};
7536 template <> struct S<int> { void f(); };
7537 void S<int>::f () {}
7539 is correct; there shouldn't be a `template <>' for the
7540 definition of `S<int>::f'. */
7541 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
7542 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
7543 /* T is an explicit (not partial) specialization. All
7544 containing classes must therefore also be explicitly
7547 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
7548 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
7549 template_count += 1;
7551 t = TYPE_MAIN_DECL (t);
7552 t = DECL_CONTEXT (t);
7555 if (ctype == current_class_type)
7558 pedwarn ("member functions are implicitly friends of their class");
7560 pedwarn ("extra qualification %<%T::%> on member %qs",
7563 else if (TREE_CODE (type) == FUNCTION_TYPE)
7565 tree sname = declarator->u.id.unqualified_name;
7567 if (current_class_type
7568 && (!friendp || funcdef_flag))
7571 ? "cannot define member function %<%T::%s%> within %<%T%>"
7572 : "cannot declare member function %<%T::%s%> within %<%T%>",
7573 ctype, name, current_class_type);
7574 return error_mark_node;
7577 if (TREE_CODE (sname) == IDENTIFIER_NODE
7578 && NEW_DELETE_OPNAME_P (sname))
7579 /* Overloaded operator new and operator delete
7580 are always static functions. */
7583 type = build_method_type_directly (ctype,
7585 TYPE_ARG_TYPES (type));
7587 else if (declspecs->specs[(int)ds_typedef]
7588 || COMPLETE_TYPE_P (complete_type (ctype)))
7590 /* Have to move this code elsewhere in this function.
7591 this code is used for i.e., typedef int A::M; M *pm;
7593 It is? How? jason 10/2/94 */
7595 if (current_class_type)
7597 error ("cannot declare member %<%T::%s%> within %qT",
7598 ctype, name, current_class_type);
7599 return void_type_node;
7604 cxx_incomplete_type_error (NULL_TREE, ctype);
7605 return error_mark_node;
7609 /* Now TYPE has the actual type. */
7614 *attrlist = chainon (returned_attrs, *attrlist);
7616 attrlist = &returned_attrs;
7619 /* Did array size calculations overflow? */
7621 if (TREE_CODE (type) == ARRAY_TYPE
7622 && COMPLETE_TYPE_P (type)
7623 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
7624 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
7626 error ("size of array %qs is too large", name);
7627 /* If we proceed with the array type as it is, we'll eventually
7628 crash in tree_low_cst(). */
7629 type = error_mark_node;
7632 if ((decl_context == FIELD || decl_context == PARM)
7633 && !processing_template_decl
7634 && variably_modified_type_p (type, NULL_TREE))
7636 if (decl_context == FIELD)
7637 error ("data member may not have variably modified type %qT", type);
7639 error ("parameter may not have variably modified type %qT", type);
7640 type = error_mark_node;
7643 if (explicitp == 1 || (explicitp && friendp))
7645 /* [dcl.fct.spec] The explicit specifier shall only be used in
7646 declarations of constructors within a class definition. */
7647 error ("only declarations of constructors can be %<explicit%>");
7651 if (storage_class == sc_mutable)
7653 if (decl_context != FIELD || friendp)
7655 error ("non-member %qs cannot be declared %<mutable%>", name);
7656 storage_class = sc_none;
7658 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
7660 error ("non-object member %qs cannot be declared %<mutable%>", name);
7661 storage_class = sc_none;
7663 else if (TREE_CODE (type) == FUNCTION_TYPE
7664 || TREE_CODE (type) == METHOD_TYPE)
7666 error ("function %qs cannot be declared %<mutable%>", name);
7667 storage_class = sc_none;
7671 error ("static %qs cannot be declared %<mutable%>", name);
7672 storage_class = sc_none;
7674 else if (type_quals & TYPE_QUAL_CONST)
7676 error ("const %qs cannot be declared %<mutable%>", name);
7677 storage_class = sc_none;
7681 /* If this is declaring a typedef name, return a TYPE_DECL. */
7682 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
7686 /* Note that the grammar rejects storage classes
7687 in typenames, fields or parameters. */
7688 if (current_lang_name == lang_name_java)
7689 TYPE_FOR_JAVA (type) = 1;
7691 if (decl_context == FIELD)
7692 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
7694 decl = build_decl (TYPE_DECL, unqualified_id, type);
7695 if (id_declarator && declarator->u.id.qualifying_scope)
7696 error ("%Jtypedef name may not be a nested-name-specifier", decl);
7698 if (decl_context != FIELD)
7700 if (!current_function_decl)
7701 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
7702 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
7703 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
7704 (current_function_decl)))
7705 /* The TYPE_DECL is "abstract" because there will be
7706 clones of this constructor/destructor, and there will
7707 be copies of this TYPE_DECL generated in those
7709 DECL_ABSTRACT (decl) = 1;
7711 else if (constructor_name_p (unqualified_id, current_class_type))
7712 pedwarn ("ISO C++ forbids nested type %qD with same name "
7713 "as enclosing class",
7716 /* If the user declares "typedef struct {...} foo" then the
7717 struct will have an anonymous name. Fill that name in now.
7718 Nothing can refer to it, so nothing needs know about the name
7720 if (type != error_mark_node
7723 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
7724 && TYPE_ANONYMOUS_P (type)
7725 /* Don't do this if there are attributes. */
7726 && (!attrlist || !*attrlist)
7727 && cp_type_quals (type) == TYPE_UNQUALIFIED)
7729 tree oldname = TYPE_NAME (type);
7732 /* Replace the anonymous name with the real name everywhere. */
7733 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
7734 if (TYPE_NAME (t) == oldname)
7735 TYPE_NAME (t) = decl;
7737 if (TYPE_LANG_SPECIFIC (type))
7738 TYPE_WAS_ANONYMOUS (type) = 1;
7740 /* If this is a typedef within a template class, the nested
7741 type is a (non-primary) template. The name for the
7742 template needs updating as well. */
7743 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
7744 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
7745 = TYPE_IDENTIFIER (type);
7747 /* FIXME remangle member functions; member functions of a
7748 type with external linkage have external linkage. */
7753 if (ctype == NULL_TREE)
7755 if (TREE_CODE (type) == METHOD_TYPE)
7756 ctype = TYPE_METHOD_BASETYPE (type);
7757 /* Any qualifiers on a function type typedef have
7758 already been dealt with. */
7759 else if (TREE_CODE (type) == FUNCTION_TYPE)
7760 quals = TYPE_UNQUALIFIED;
7762 if (ctype != NULL_TREE)
7763 grok_method_quals (ctype, decl, quals);
7767 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
7768 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
7770 bad_specifiers (decl, "type", virtualp, quals != TYPE_UNQUALIFIED,
7771 inlinep, friendp, raises != NULL_TREE);
7776 /* Detect the case of an array type of unspecified size
7777 which came, as such, direct from a typedef name.
7778 We must copy the type, so that the array's domain can be
7779 individually set by the object's initializer. */
7781 if (type && typedef_type
7782 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
7783 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
7784 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
7786 /* Detect where we're using a typedef of function type to declare a
7787 function. PARMS will not be set, so we must create it now. */
7789 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
7791 tree decls = NULL_TREE;
7794 for (args = TYPE_ARG_TYPES (type); args; args = TREE_CHAIN (args))
7796 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
7798 TREE_CHAIN (decl) = decls;
7802 parms = nreverse (decls);
7804 if (decl_context != TYPENAME)
7806 /* A cv-qualifier-seq shall only be part of the function type
7807 for a non-static member function. [8.3.5/4 dcl.fct] */
7808 if (cp_type_quals (type) != TYPE_UNQUALIFIED
7809 && (current_class_type == NULL_TREE || staticp) )
7811 error ("qualified function types cannot be used to declare %s functions",
7812 (staticp? "static member" : "free"));
7813 type = TYPE_MAIN_VARIANT (type);
7816 /* The qualifiers on the function type become the qualifiers on
7817 the non-static member function. */
7818 quals |= cp_type_quals (type);
7822 /* If this is a type name (such as, in a cast or sizeof),
7823 compute the type and return it now. */
7825 if (decl_context == TYPENAME)
7827 /* Note that the grammar rejects storage classes
7828 in typenames, fields or parameters. */
7829 if (type_quals != TYPE_UNQUALIFIED)
7830 type_quals = TYPE_UNQUALIFIED;
7832 /* Special case: "friend class foo" looks like a TYPENAME context. */
7835 if (type_quals != TYPE_UNQUALIFIED)
7837 error ("type qualifiers specified for friend class declaration");
7838 type_quals = TYPE_UNQUALIFIED;
7842 error ("%<inline%> specified for friend class declaration");
7848 /* Don't allow friend declaration without a class-key. */
7849 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
7850 pedwarn ("template parameters cannot be friends");
7851 else if (TREE_CODE (type) == TYPENAME_TYPE)
7852 pedwarn ("friend declaration requires class-key, "
7853 "i.e. %<friend class %T::%D%>",
7854 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
7856 pedwarn ("friend declaration requires class-key, "
7857 "i.e. %<friend %#T%>",
7861 /* Only try to do this stuff if we didn't already give up. */
7862 if (type != integer_type_node)
7864 /* A friendly class? */
7865 if (current_class_type)
7866 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
7869 error ("trying to make class %qT a friend of global scope",
7872 type = void_type_node;
7877 if (ctype == NULL_TREE)
7879 if (TREE_CODE (type) != METHOD_TYPE)
7880 error ("invalid qualifiers on non-member function type");
7882 ctype = TYPE_METHOD_BASETYPE (type);
7886 tree dummy = build_decl (TYPE_DECL, unqualified_id, type);
7887 grok_method_quals (ctype, dummy, quals);
7888 type = TREE_TYPE (dummy);
7894 else if (unqualified_id == NULL_TREE && decl_context != PARM
7895 && decl_context != CATCHPARM
7896 && TREE_CODE (type) != UNION_TYPE
7899 error ("abstract declarator %qT used as declaration", type);
7900 return error_mark_node;
7903 /* Only functions may be declared using an operator-function-id. */
7905 && IDENTIFIER_OPNAME_P (unqualified_id)
7906 && TREE_CODE (type) != FUNCTION_TYPE
7907 && TREE_CODE (type) != METHOD_TYPE)
7909 error ("declaration of %qD as non-function", unqualified_id);
7910 return error_mark_node;
7913 /* We don't check parameter types here because we can emit a better
7914 error message later. */
7915 if (decl_context != PARM)
7916 type = check_var_type (unqualified_id, type);
7918 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
7919 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
7921 if (decl_context == PARM || decl_context == CATCHPARM)
7923 if (ctype || in_namespace)
7924 error ("cannot use %<::%> in parameter declaration");
7926 /* A parameter declared as an array of T is really a pointer to T.
7927 One declared as a function is really a pointer to a function.
7928 One declared as a member is really a pointer to member. */
7930 if (TREE_CODE (type) == ARRAY_TYPE)
7932 /* Transfer const-ness of array into that of type pointed to. */
7933 type = build_pointer_type (TREE_TYPE (type));
7934 type_quals = TYPE_UNQUALIFIED;
7936 else if (TREE_CODE (type) == FUNCTION_TYPE)
7937 type = build_pointer_type (type);
7943 if (decl_context == PARM)
7945 decl = cp_build_parm_decl (unqualified_id, type);
7947 bad_specifiers (decl, "parameter", virtualp, quals != TYPE_UNQUALIFIED,
7948 inlinep, friendp, raises != NULL_TREE);
7950 else if (decl_context == FIELD)
7952 /* The C99 flexible array extension. */
7953 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
7954 && TYPE_DOMAIN (type) == NULL_TREE)
7956 tree itype = compute_array_index_type (dname, integer_zero_node);
7957 type = build_cplus_array_type (TREE_TYPE (type), itype);
7960 if (type == error_mark_node)
7962 /* Happens when declaring arrays of sizes which
7963 are error_mark_node, for example. */
7966 else if (in_namespace && !friendp)
7968 /* Something like struct S { int N::j; }; */
7969 error ("invalid use of %<::%>");
7972 else if (TREE_CODE (type) == FUNCTION_TYPE)
7975 tree function_context;
7979 if (ctype == NULL_TREE)
7980 ctype = current_class_type;
7982 if (ctype == NULL_TREE)
7984 error ("can't make %qD into a method -- not in a class",
7986 return void_type_node;
7989 /* ``A union may [ ... ] not [ have ] virtual functions.''
7991 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
7993 error ("function %qD declared virtual inside a union",
7995 return void_type_node;
7998 if (NEW_DELETE_OPNAME_P (unqualified_id))
8002 error ("%qD cannot be declared virtual, since it "
8008 else if (staticp < 2)
8009 type = build_method_type_directly (ctype,
8011 TYPE_ARG_TYPES (type));
8014 /* Check that the name used for a destructor makes sense. */
8015 if (sfk == sfk_destructor)
8019 gcc_assert (friendp);
8020 error ("expected qualified name in friend declaration "
8021 "for destructor %qD",
8022 id_declarator->u.id.unqualified_name);
8023 return error_mark_node;
8026 if (!same_type_p (TREE_OPERAND
8027 (id_declarator->u.id.unqualified_name, 0),
8030 error ("declaration of %qD as member of %qT",
8031 id_declarator->u.id.unqualified_name, ctype);
8032 return error_mark_node;
8036 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
8037 function_context = (ctype != NULL_TREE) ?
8038 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
8039 publicp = (! friendp || ! staticp)
8040 && function_context == NULL_TREE;
8041 decl = grokfndecl (ctype, type,
8042 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
8043 ? unqualified_id : dname,
8046 virtualp, flags, quals, raises,
8047 friendp ? -1 : 0, friendp, publicp, inlinep,
8049 funcdef_flag, template_count, in_namespace, attrlist);
8050 if (decl == NULL_TREE)
8053 /* This clobbers the attrs stored in `decl' from `attrlist'. */
8054 /* The decl and setting of decl_attr is also turned off. */
8055 decl = build_decl_attribute_variant (decl, decl_attr);
8058 /* [class.conv.ctor]
8060 A constructor declared without the function-specifier
8061 explicit that can be called with a single parameter
8062 specifies a conversion from the type of its first
8063 parameter to the type of its class. Such a constructor
8064 is called a converting constructor. */
8066 DECL_NONCONVERTING_P (decl) = 1;
8067 else if (DECL_CONSTRUCTOR_P (decl))
8069 /* The constructor can be called with exactly one
8070 parameter if there is at least one parameter, and
8071 any subsequent parameters have default arguments.
8072 Ignore any compiler-added parms. */
8073 tree arg_types = FUNCTION_FIRST_USER_PARMTYPE (decl);
8075 if (arg_types == void_list_node
8077 && TREE_CHAIN (arg_types)
8078 && TREE_CHAIN (arg_types) != void_list_node
8079 && !TREE_PURPOSE (TREE_CHAIN (arg_types))))
8080 DECL_NONCONVERTING_P (decl) = 1;
8083 else if (TREE_CODE (type) == METHOD_TYPE)
8085 /* We only get here for friend declarations of
8086 members of other classes. */
8087 /* All method decls are public, so tell grokfndecl to set
8088 TREE_PUBLIC, also. */
8089 decl = grokfndecl (ctype, type,
8090 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
8091 ? unqualified_id : dname,
8094 virtualp, flags, quals, raises,
8095 friendp ? -1 : 0, friendp, 1, 0, sfk,
8096 funcdef_flag, template_count, in_namespace,
8098 if (decl == NULL_TREE)
8101 else if (!staticp && !dependent_type_p (type)
8102 && !COMPLETE_TYPE_P (complete_type (type))
8103 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
8106 error ("field %qD has incomplete type", unqualified_id);
8108 error ("name %qT has incomplete type", type);
8110 /* If we're instantiating a template, tell them which
8111 instantiation made the field's type be incomplete. */
8112 if (current_class_type
8113 && TYPE_NAME (current_class_type)
8114 && IDENTIFIER_TEMPLATE (TYPE_IDENTIFIER (current_class_type))
8116 && declspecs->type == type)
8117 error (" in instantiation of template %qT",
8118 current_class_type);
8120 type = error_mark_node;
8127 error ("%qE is neither function nor member function; "
8128 "cannot be declared friend", unqualified_id);
8136 /* Friends are treated specially. */
8137 if (ctype == current_class_type)
8138 ; /* We already issued a pedwarn. */
8139 else if (decl && DECL_NAME (decl))
8141 if (template_class_depth (current_class_type) == 0)
8143 decl = check_explicit_specialization
8144 (unqualified_id, decl, template_count,
8145 2 * funcdef_flag + 4);
8146 if (decl == error_mark_node)
8147 return error_mark_node;
8150 decl = do_friend (ctype, unqualified_id, decl,
8151 *attrlist, flags, quals, funcdef_flag);
8155 return void_type_node;
8158 /* Structure field. It may not be a function, except for C++. */
8160 if (decl == NULL_TREE)
8166 /* An attempt is being made to initialize a non-static
8167 member. But, from [class.mem]:
8169 4 A member-declarator can contain a
8170 constant-initializer only if it declares a static
8171 member (_class.static_) of integral or enumeration
8172 type, see _class.static.data_.
8174 This used to be relatively common practice, but
8175 the rest of the compiler does not correctly
8176 handle the initialization unless the member is
8177 static so we make it static below. */
8178 pedwarn ("ISO C++ forbids initialization of member %qD",
8180 pedwarn ("making %qD static", unqualified_id);
8184 if (uses_template_parms (type))
8185 /* We'll check at instantiation time. */
8187 else if (check_static_variable_definition (unqualified_id,
8189 /* If we just return the declaration, crashes
8190 will sometimes occur. We therefore return
8191 void_type_node, as if this was a friend
8192 declaration, to cause callers to completely
8193 ignore this declaration. */
8194 return void_type_node;
8199 /* C++ allows static class members. All other work
8200 for this is done by grokfield. */
8201 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
8202 set_linkage_for_static_data_member (decl);
8203 /* Even if there is an in-class initialization, DECL
8204 is considered undefined until an out-of-class
8205 definition is provided. */
8206 DECL_EXTERNAL (decl) = 1;
8210 if (targetm.have_tls)
8211 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
8213 /* A mere warning is sure to result in improper
8214 semantics at runtime. Don't bother to allow this to
8216 error ("thread-local storage not supported for this target");
8221 decl = build_decl (FIELD_DECL, unqualified_id, type);
8222 DECL_NONADDRESSABLE_P (decl) = bitfield;
8223 if (storage_class == sc_mutable)
8225 DECL_MUTABLE_P (decl) = 1;
8226 storage_class = sc_none;
8230 bad_specifiers (decl, "field", virtualp, quals != TYPE_UNQUALIFIED,
8231 inlinep, friendp, raises != NULL_TREE);
8234 else if (TREE_CODE (type) == FUNCTION_TYPE
8235 || TREE_CODE (type) == METHOD_TYPE)
8240 if (!unqualified_id)
8243 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
8244 original_name = dname;
8246 original_name = unqualified_id;
8248 if (storage_class == sc_auto)
8249 error ("storage class %<auto%> invalid for function %qs", name);
8250 else if (storage_class == sc_register)
8251 error ("storage class %<register%> invalid for function %qs", name);
8253 error ("storage class %<__thread%> invalid for function %qs", name);
8255 /* Function declaration not at top level.
8256 Storage classes other than `extern' are not allowed
8257 and `extern' makes no difference. */
8258 if (! toplevel_bindings_p ()
8259 && (storage_class == sc_static
8260 || declspecs->specs[(int)ds_inline])
8263 if (storage_class == sc_static)
8264 pedwarn ("%<static%> specified invalid for function %qs "
8265 "declared out of global scope", name);
8267 pedwarn ("%<inline%> specifier invalid for function %qs "
8268 "declared out of global scope", name);
8271 if (ctype == NULL_TREE)
8275 error ("virtual non-class function %qs", name);
8279 else if (TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
8280 && !NEW_DELETE_OPNAME_P (original_name))
8281 type = build_method_type_directly (ctype,
8283 TYPE_ARG_TYPES (type));
8285 /* Record presence of `static'. */
8286 publicp = (ctype != NULL_TREE
8287 || storage_class == sc_extern
8288 || storage_class != sc_static);
8290 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
8291 virtualp, flags, quals, raises,
8293 publicp, inlinep, sfk, funcdef_flag,
8294 template_count, in_namespace, attrlist);
8295 if (decl == NULL_TREE)
8300 int invalid_static = 0;
8302 /* Don't allow a static member function in a class, and forbid
8303 declaring main to be static. */
8304 if (TREE_CODE (type) == METHOD_TYPE)
8306 pedwarn ("cannot declare member function %qD to have "
8307 "static linkage", decl);
8310 else if (current_function_decl)
8312 /* FIXME need arm citation */
8313 error ("cannot declare static function inside another function");
8320 storage_class = sc_none;
8326 /* It's a variable. */
8328 /* An uninitialized decl with `extern' is a reference. */
8329 decl = grokvardecl (type, unqualified_id,
8332 (type_quals & TYPE_QUAL_CONST) != 0,
8333 ctype ? ctype : in_namespace);
8334 bad_specifiers (decl, "variable", virtualp, quals != TYPE_UNQUALIFIED,
8335 inlinep, friendp, raises != NULL_TREE);
8339 DECL_CONTEXT (decl) = ctype;
8342 pedwarn ("%<static%> may not be used when defining "
8343 "(as opposed to declaring) a static data member");
8345 storage_class = sc_none;
8347 if (storage_class == sc_register && TREE_STATIC (decl))
8349 error ("static member %qD declared %<register%>", decl);
8350 storage_class = sc_none;
8352 if (storage_class == sc_extern && pedantic)
8354 pedwarn ("cannot explicitly declare member %q#D to have "
8357 storage_class = sc_none;
8362 /* Record `register' declaration for warnings on &
8363 and in case doing stupid register allocation. */
8365 if (storage_class == sc_register)
8366 DECL_REGISTER (decl) = 1;
8367 else if (storage_class == sc_extern)
8368 DECL_THIS_EXTERN (decl) = 1;
8369 else if (storage_class == sc_static)
8370 DECL_THIS_STATIC (decl) = 1;
8372 /* Record constancy and volatility. There's no need to do this
8373 when processing a template; we'll do this for the instantiated
8374 declaration based on the type of DECL. */
8375 if (!processing_template_decl)
8376 cp_apply_type_quals_to_decl (type_quals, decl);
8382 /* Subroutine of start_function. Ensure that each of the parameter
8383 types (as listed in PARMS) is complete, as is required for a
8384 function definition. */
8387 require_complete_types_for_parms (tree parms)
8389 for (; parms; parms = TREE_CHAIN (parms))
8391 if (dependent_type_p (TREE_TYPE (parms)))
8393 if (!VOID_TYPE_P (TREE_TYPE (parms))
8394 && complete_type_or_else (TREE_TYPE (parms), parms))
8396 relayout_decl (parms);
8397 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
8400 /* grokparms or complete_type_or_else will have already issued
8402 TREE_TYPE (parms) = error_mark_node;
8406 /* Returns nonzero if T is a local variable. */
8409 local_variable_p (tree t)
8411 if ((TREE_CODE (t) == VAR_DECL
8412 /* A VAR_DECL with a context that is a _TYPE is a static data
8414 && !TYPE_P (CP_DECL_CONTEXT (t))
8415 /* Any other non-local variable must be at namespace scope. */
8416 && !DECL_NAMESPACE_SCOPE_P (t))
8417 || (TREE_CODE (t) == PARM_DECL))
8423 /* Returns nonzero if T is an automatic local variable or a label.
8424 (These are the declarations that need to be remapped when the code
8425 containing them is duplicated.) */
8428 nonstatic_local_decl_p (tree t)
8430 return ((local_variable_p (t) && !TREE_STATIC (t))
8431 || TREE_CODE (t) == LABEL_DECL
8432 || TREE_CODE (t) == RESULT_DECL);
8435 /* Like local_variable_p, but suitable for use as a tree-walking
8439 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
8440 void *data ATTRIBUTE_UNUSED)
8442 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
8444 else if (TYPE_P (*tp))
8451 /* Check that ARG, which is a default-argument expression for a
8452 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
8453 something goes wrong. DECL may also be a _TYPE node, rather than a
8454 DECL, if there is no DECL available. */
8457 check_default_argument (tree decl, tree arg)
8462 if (TREE_CODE (arg) == DEFAULT_ARG)
8463 /* We get a DEFAULT_ARG when looking at an in-class declaration
8464 with a default argument. Ignore the argument for now; we'll
8465 deal with it after the class is complete. */
8474 decl_type = TREE_TYPE (decl);
8476 if (arg == error_mark_node
8477 || decl == error_mark_node
8478 || TREE_TYPE (arg) == error_mark_node
8479 || decl_type == error_mark_node)
8480 /* Something already went wrong. There's no need to check
8482 return error_mark_node;
8484 /* [dcl.fct.default]
8486 A default argument expression is implicitly converted to the
8488 if (!TREE_TYPE (arg)
8489 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
8492 error ("default argument for %q#D has type %qT",
8493 decl, TREE_TYPE (arg));
8495 error ("default argument for parameter of type %qT has type %qT",
8496 decl_type, TREE_TYPE (arg));
8498 return error_mark_node;
8501 /* [dcl.fct.default]
8503 Local variables shall not be used in default argument
8506 The keyword `this' shall not be used in a default argument of a
8508 var = walk_tree_without_duplicates (&arg, local_variable_p_walkfn,
8512 error ("default argument %qE uses local variable %qD", arg, var);
8513 return error_mark_node;
8520 /* Decode the list of parameter types for a function type.
8521 Given the list of things declared inside the parens,
8522 return a list of types.
8524 If this parameter does not end with an ellipsis, we append
8527 *PARMS is set to the chain of PARM_DECLs created. */
8530 grokparms (cp_parameter_declarator *first_parm, tree *parms)
8532 tree result = NULL_TREE;
8533 tree decls = NULL_TREE;
8534 int ellipsis = !first_parm || first_parm->ellipsis_p;
8535 cp_parameter_declarator *parm;
8538 for (parm = first_parm; parm != NULL; parm = parm->next)
8540 tree type = NULL_TREE;
8541 tree init = parm->default_argument;
8545 if (parm == no_parameters)
8548 attrs = parm->decl_specifiers.attributes;
8549 parm->decl_specifiers.attributes = NULL_TREE;
8550 decl = grokdeclarator (parm->declarator, &parm->decl_specifiers,
8551 PARM, init != NULL_TREE, &attrs);
8552 if (! decl || TREE_TYPE (decl) == error_mark_node)
8556 cplus_decl_attributes (&decl, attrs, 0);
8558 type = TREE_TYPE (decl);
8559 if (VOID_TYPE_P (type))
8561 if (same_type_p (type, void_type_node)
8562 && DECL_SELF_REFERENCE_P (type)
8563 && !DECL_NAME (decl) && !result && !parm->next && !ellipsis)
8564 /* this is a parmlist of `(void)', which is ok. */
8566 cxx_incomplete_type_error (decl, type);
8567 /* It's not a good idea to actually create parameters of
8568 type `void'; other parts of the compiler assume that a
8569 void type terminates the parameter list. */
8570 type = error_mark_node;
8571 TREE_TYPE (decl) = error_mark_node;
8574 if (type != error_mark_node)
8576 /* Top-level qualifiers on the parameters are
8577 ignored for function types. */
8578 type = cp_build_qualified_type (type, 0);
8579 if (TREE_CODE (type) == METHOD_TYPE)
8581 error ("parameter %qD invalidly declared method type", decl);
8582 type = build_pointer_type (type);
8583 TREE_TYPE (decl) = type;
8585 else if (abstract_virtuals_error (decl, type))
8586 any_error = 1; /* Seems like a good idea. */
8587 else if (POINTER_TYPE_P (type))
8589 /* [dcl.fct]/6, parameter types cannot contain pointers
8590 (references) to arrays of unknown bound. */
8591 tree t = TREE_TYPE (type);
8592 int ptr = TYPE_PTR_P (type);
8598 else if (TREE_CODE (t) != ARRAY_TYPE)
8600 else if (!TYPE_DOMAIN (t))
8604 if (TREE_CODE (t) == ARRAY_TYPE)
8605 error ("parameter %qD includes %s to array of unknown "
8607 decl, ptr ? "pointer" : "reference", t);
8612 else if (init && !processing_template_decl)
8613 init = check_default_argument (decl, init);
8616 TREE_CHAIN (decl) = decls;
8618 result = tree_cons (init, type, result);
8620 decls = nreverse (decls);
8621 result = nreverse (result);
8623 result = chainon (result, void_list_node);
8630 /* D is a constructor or overloaded `operator='.
8632 Let T be the class in which D is declared. Then, this function
8635 -1 if D's is an ill-formed constructor or copy assignment operator
8636 whose first parameter is of type `T'.
8637 0 if D is not a copy constructor or copy assignment
8639 1 if D is a copy constructor or copy assignment operator whose
8640 first parameter is a reference to const qualified T.
8641 2 if D is a copy constructor or copy assignment operator whose
8642 first parameter is a reference to non-const qualified T.
8644 This function can be used as a predicate. Positive values indicate
8645 a copy constructor and nonzero values indicate a copy assignment
8655 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
8657 if (DECL_TEMPLATE_INFO (d)
8658 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d)))
8659 /* Instantiations of template member functions are never copy
8660 functions. Note that member functions of templated classes are
8661 represented as template functions internally, and we must
8662 accept those as copy functions. */
8665 args = FUNCTION_FIRST_USER_PARMTYPE (d);
8669 arg_type = TREE_VALUE (args);
8671 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
8673 /* Pass by value copy assignment operator. */
8676 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
8677 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
8679 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
8685 args = TREE_CHAIN (args);
8687 if (args && args != void_list_node && !TREE_PURPOSE (args))
8688 /* There are more non-optional args. */
8694 /* Remember any special properties of member function DECL. */
8696 void grok_special_member_properties (tree decl)
8698 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P(decl))
8699 ; /* Not special. */
8700 else if (DECL_CONSTRUCTOR_P (decl))
8702 int ctor = copy_fn_p (decl);
8708 A non-template constructor for class X is a copy
8709 constructor if its first parameter is of type X&, const
8710 X&, volatile X& or const volatile X&, and either there
8711 are no other parameters or else all other parameters have
8712 default arguments. */
8713 TYPE_HAS_INIT_REF (DECL_CONTEXT (decl)) = 1;
8715 TYPE_HAS_CONST_INIT_REF (DECL_CONTEXT (decl)) = 1;
8717 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
8718 TYPE_HAS_DEFAULT_CONSTRUCTOR (DECL_CONTEXT (decl)) = 1;
8720 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
8724 A non-template assignment operator for class X is a copy
8725 assignment operator if its parameter is of type X, X&, const
8726 X&, volatile X& or const volatile X&. */
8728 int assop = copy_fn_p (decl);
8732 TYPE_HAS_ASSIGN_REF (DECL_CONTEXT (decl)) = 1;
8734 TYPE_HAS_CONST_ASSIGN_REF (DECL_CONTEXT (decl)) = 1;
8739 /* Check a constructor DECL has the correct form. Complains
8740 if the class has a constructor of the form X(X). */
8743 grok_ctor_properties (tree ctype, tree decl)
8745 int ctor_parm = copy_fn_p (decl);
8751 A declaration of a constructor for a class X is ill-formed if
8752 its first parameter is of type (optionally cv-qualified) X
8753 and either there are no other parameters or else all other
8754 parameters have default arguments.
8756 We *don't* complain about member template instantiations that
8757 have this form, though; they can occur as we try to decide
8758 what constructor to use during overload resolution. Since
8759 overload resolution will never prefer such a constructor to
8760 the non-template copy constructor (which is either explicitly
8761 or implicitly defined), there's no need to worry about their
8762 existence. Theoretically, they should never even be
8763 instantiated, but that's hard to forestall. */
8764 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
8772 /* An operator with this code is unary, but can also be binary. */
8775 ambi_op_p (enum tree_code code)
8777 return (code == INDIRECT_REF
8778 || code == ADDR_EXPR
8779 || code == UNARY_PLUS_EXPR
8780 || code == NEGATE_EXPR
8781 || code == PREINCREMENT_EXPR
8782 || code == PREDECREMENT_EXPR);
8785 /* An operator with this name can only be unary. */
8788 unary_op_p (enum tree_code code)
8790 return (code == TRUTH_NOT_EXPR
8791 || code == BIT_NOT_EXPR
8792 || code == COMPONENT_REF
8793 || code == TYPE_EXPR);
8796 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
8797 errors are issued for invalid declarations. */
8800 grok_op_properties (tree decl, bool complain)
8802 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
8804 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
8805 tree name = DECL_NAME (decl);
8806 enum tree_code operator_code;
8810 /* Count the number of arguments. */
8811 for (argtype = argtypes, arity = 0;
8812 argtype && argtype != void_list_node;
8813 argtype = TREE_CHAIN (argtype))
8816 class_type = DECL_CONTEXT (decl);
8817 if (class_type && !CLASS_TYPE_P (class_type))
8818 class_type = NULL_TREE;
8820 if (DECL_CONV_FN_P (decl))
8821 operator_code = TYPE_EXPR;
8825 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
8826 if (ansi_opname (CODE) == name) \
8828 operator_code = (CODE); \
8831 else if (ansi_assopname (CODE) == name) \
8833 operator_code = (CODE); \
8834 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
8838 #include "operators.def"
8844 gcc_assert (operator_code != LAST_CPLUS_TREE_CODE);
8845 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
8848 switch (operator_code)
8851 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
8855 TYPE_GETS_DELETE (class_type) |= 1;
8859 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
8862 case VEC_DELETE_EXPR:
8863 TYPE_GETS_DELETE (class_type) |= 2;
8870 /* [basic.std.dynamic.allocation]/1:
8872 A program is ill-formed if an allocation function is declared
8873 in a namespace scope other than global scope or declared static
8876 The same also holds true for deallocation functions. */
8877 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
8878 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
8880 if (DECL_NAMESPACE_SCOPE_P (decl))
8882 if (CP_DECL_CONTEXT (decl) != global_namespace)
8883 error ("%qD may not be declared within a namespace", decl);
8884 else if (!TREE_PUBLIC (decl))
8885 error ("%qD may not be declared as static", decl);
8889 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
8890 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
8891 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
8892 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
8895 /* An operator function must either be a non-static member function
8896 or have at least one parameter of a class, a reference to a class,
8897 an enumeration, or a reference to an enumeration. 13.4.0.6 */
8898 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
8900 if (operator_code == TYPE_EXPR
8901 || operator_code == CALL_EXPR
8902 || operator_code == COMPONENT_REF
8903 || operator_code == ARRAY_REF
8904 || operator_code == NOP_EXPR)
8906 error ("%qD must be a nonstatic member function", decl);
8913 if (DECL_STATIC_FUNCTION_P (decl))
8915 error ("%qD must be either a non-static member "
8916 "function or a non-member function", decl);
8920 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
8922 tree arg = non_reference (TREE_VALUE (p));
8923 /* IS_AGGR_TYPE, rather than CLASS_TYPE_P, is used
8924 because these checks are performed even on
8925 template functions. */
8926 if (IS_AGGR_TYPE (arg) || TREE_CODE (arg) == ENUMERAL_TYPE)
8930 if (!p || p == void_list_node)
8935 error ("%qD must have an argument of class or "
8942 /* There are no restrictions on the arguments to an overloaded
8944 if (operator_code == CALL_EXPR)
8947 /* Warn about conversion operators that will never be used. */
8948 if (IDENTIFIER_TYPENAME_P (name)
8949 && ! DECL_TEMPLATE_INFO (decl)
8951 /* Warn only declaring the function; there is no need to
8952 warn again about out-of-class definitions. */
8953 && class_type == current_class_type)
8955 tree t = TREE_TYPE (name);
8956 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
8957 const char *what = 0;
8960 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
8962 if (TREE_CODE (t) == VOID_TYPE)
8964 else if (class_type)
8966 if (t == class_type)
8967 what = "the same type";
8968 /* Don't force t to be complete here. */
8969 else if (IS_AGGR_TYPE (t)
8970 && COMPLETE_TYPE_P (t)
8971 && DERIVED_FROM_P (t, class_type))
8972 what = "a base class";
8976 warning (OPT_Wconversion, "conversion to %s%s will never use a type "
8977 "conversion operator",
8978 ref ? "a reference to " : "", what);
8980 if (operator_code == COND_EXPR)
8983 error ("ISO C++ prohibits overloading operator ?:");
8985 else if (ambi_op_p (operator_code))
8988 /* We pick the one-argument operator codes by default, so
8989 we don't have to change anything. */
8991 else if (arity == 2)
8993 /* If we thought this was a unary operator, we now know
8994 it to be a binary operator. */
8995 switch (operator_code)
8998 operator_code = MULT_EXPR;
9002 operator_code = BIT_AND_EXPR;
9005 case UNARY_PLUS_EXPR:
9006 operator_code = PLUS_EXPR;
9010 operator_code = MINUS_EXPR;
9013 case PREINCREMENT_EXPR:
9014 operator_code = POSTINCREMENT_EXPR;
9017 case PREDECREMENT_EXPR:
9018 operator_code = POSTDECREMENT_EXPR;
9025 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
9027 if ((operator_code == POSTINCREMENT_EXPR
9028 || operator_code == POSTDECREMENT_EXPR)
9029 && ! processing_template_decl
9030 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
9033 error ("postfix %qD must take %<int%> as its argument",
9037 ("postfix %qD must take %<int%> as its second argument",
9044 error ("%qD must take either zero or one argument", decl);
9046 error ("%qD must take either one or two arguments", decl);
9049 /* More Effective C++ rule 6. */
9051 && (operator_code == POSTINCREMENT_EXPR
9052 || operator_code == POSTDECREMENT_EXPR
9053 || operator_code == PREINCREMENT_EXPR
9054 || operator_code == PREDECREMENT_EXPR))
9056 tree arg = TREE_VALUE (argtypes);
9057 tree ret = TREE_TYPE (TREE_TYPE (decl));
9058 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
9059 arg = TREE_TYPE (arg);
9060 arg = TYPE_MAIN_VARIANT (arg);
9061 if (operator_code == PREINCREMENT_EXPR
9062 || operator_code == PREDECREMENT_EXPR)
9064 if (TREE_CODE (ret) != REFERENCE_TYPE
9065 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
9067 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
9068 build_reference_type (arg));
9072 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
9073 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
9077 else if (unary_op_p (operator_code))
9082 error ("%qD must take %<void%>", decl);
9084 error ("%qD must take exactly one argument", decl);
9087 else /* if (binary_op_p (operator_code)) */
9092 error ("%qD must take exactly one argument", decl);
9094 error ("%qD must take exactly two arguments", decl);
9097 /* More Effective C++ rule 7. */
9099 && (operator_code == TRUTH_ANDIF_EXPR
9100 || operator_code == TRUTH_ORIF_EXPR
9101 || operator_code == COMPOUND_EXPR))
9102 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
9106 /* Effective C++ rule 23. */
9109 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
9110 && (operator_code == PLUS_EXPR
9111 || operator_code == MINUS_EXPR
9112 || operator_code == TRUNC_DIV_EXPR
9113 || operator_code == MULT_EXPR
9114 || operator_code == TRUNC_MOD_EXPR)
9115 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
9116 warning (OPT_Weffc__, "%qD should return by value", decl);
9119 for (; argtypes && argtypes != void_list_node;
9120 argtypes = TREE_CHAIN (argtypes))
9121 if (TREE_PURPOSE (argtypes))
9123 TREE_PURPOSE (argtypes) = NULL_TREE;
9124 if (operator_code == POSTINCREMENT_EXPR
9125 || operator_code == POSTDECREMENT_EXPR)
9128 pedwarn ("%qD cannot have default arguments", decl);
9131 error ("%qD cannot have default arguments", decl);
9138 /* Return a string giving the keyword associate with CODE. */
9141 tag_name (enum tag_types code)
9160 /* Name lookup in an elaborated-type-specifier (after the keyword
9161 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
9162 elaborated-type-specifier is invalid, issue a diagnostic and return
9163 error_mark_node; otherwise, return the *_TYPE to which it referred.
9164 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
9167 check_elaborated_type_specifier (enum tag_types tag_code,
9169 bool allow_template_p)
9175 struct S { struct S *p; };
9177 name lookup will find the TYPE_DECL for the implicit "S::S"
9178 typedef. Adjust for that here. */
9179 if (DECL_SELF_REFERENCE_P (decl))
9180 decl = TYPE_NAME (TREE_TYPE (decl));
9182 type = TREE_TYPE (decl);
9184 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
9185 is false for this case as well. */
9186 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
9188 error ("using template type parameter %qT after %qs",
9189 type, tag_name (tag_code));
9190 return error_mark_node;
9194 If the identifier resolves to a typedef-name or a template
9195 type-parameter, the elaborated-type-specifier is ill-formed.
9197 In other words, the only legitimate declaration to use in the
9198 elaborated type specifier is the implicit typedef created when
9199 the type is declared. */
9200 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
9201 && tag_code != typename_type)
9203 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
9204 error ("%q+D has a previous declaration here", decl);
9205 return error_mark_node;
9207 else if (TREE_CODE (type) != RECORD_TYPE
9208 && TREE_CODE (type) != UNION_TYPE
9209 && tag_code != enum_type
9210 && tag_code != typename_type)
9212 error ("%qT referred to as %qs", type, tag_name (tag_code));
9213 error ("%q+T has a previous declaration here", type);
9214 return error_mark_node;
9216 else if (TREE_CODE (type) != ENUMERAL_TYPE
9217 && tag_code == enum_type)
9219 error ("%qT referred to as enum", type);
9220 error ("%q+T has a previous declaration here", type);
9221 return error_mark_node;
9223 else if (!allow_template_p
9224 && TREE_CODE (type) == RECORD_TYPE
9225 && CLASSTYPE_IS_TEMPLATE (type))
9227 /* If a class template appears as elaborated type specifier
9228 without a template header such as:
9230 template <class T> class C {};
9231 void f(class C); // No template header here
9233 then the required template argument is missing. */
9234 error ("template argument required for %<%s %T%>",
9235 tag_name (tag_code),
9236 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
9237 return error_mark_node;
9243 /* Lookup NAME in elaborate type specifier in scope according to
9244 SCOPE and issue diagnostics if necessary.
9245 Return *_TYPE node upon success, NULL_TREE when the NAME is not
9246 found, and ERROR_MARK_NODE for type error. */
9249 lookup_and_check_tag (enum tag_types tag_code, tree name,
9250 tag_scope scope, bool template_header_p)
9254 if (scope == ts_global)
9256 /* First try ordinary name lookup, ignoring hidden class name
9257 injected via friend declaration. */
9258 decl = lookup_name_prefer_type (name, 2);
9259 /* If that fails, the name will be placed in the smallest
9260 non-class, non-function-prototype scope according to 3.3.1/5.
9261 We may already have a hidden name declared as friend in this
9262 scope. So lookup again but not ignoring hidden name.
9263 If we find one, that name will be made visible rather than
9264 creating a new tag. */
9266 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
9269 decl = lookup_type_scope (name, scope);
9271 if (decl && DECL_CLASS_TEMPLATE_P (decl))
9272 decl = DECL_TEMPLATE_RESULT (decl);
9274 if (decl && TREE_CODE (decl) == TYPE_DECL)
9276 /* Look for invalid nested type:
9280 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
9282 error ("%qD has the same name as the class in which it is "
9285 return error_mark_node;
9288 /* Two cases we need to consider when deciding if a class
9289 template is allowed as an elaborated type specifier:
9290 1. It is a self reference to its own class.
9291 2. It comes with a template header.
9295 template <class T> class C {
9296 class C *c1; // DECL_SELF_REFERENCE_P is true
9299 template <class U> class C; // template_header_p is true
9300 template <class T> class C<T>::D {
9301 class C *c2; // DECL_SELF_REFERENCE_P is true
9304 t = check_elaborated_type_specifier (tag_code,
9307 | DECL_SELF_REFERENCE_P (decl));
9314 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
9315 Define the tag as a forward-reference if it is not defined.
9317 If a declaration is given, process it here, and report an error if
9318 multiple declarations are not identical.
9320 SCOPE is TS_CURRENT when this is also a definition. Only look in
9321 the current frame for the name (since C++ allows new names in any
9322 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
9323 declaration. Only look beginning from the current scope outward up
9324 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
9326 TEMPLATE_HEADER_P is true when this declaration is preceded by
9327 a set of template parameters. */
9330 xref_tag (enum tag_types tag_code, tree name,
9331 tag_scope scope, bool template_header_p)
9333 enum tree_code code;
9335 tree context = NULL_TREE;
9337 timevar_push (TV_NAME_LOOKUP);
9339 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
9351 code = ENUMERAL_TYPE;
9357 /* In case of anonymous name, xref_tag is only called to
9358 make type node and push name. Name lookup is not required. */
9359 if (ANON_AGGRNAME_P (name))
9362 t = lookup_and_check_tag (tag_code, name,
9363 scope, template_header_p);
9365 if (t == error_mark_node)
9366 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
9368 if (scope != ts_current && t && current_class_type
9369 && template_class_depth (current_class_type)
9370 && template_header_p)
9372 /* Since SCOPE is not TS_CURRENT, we are not looking at a
9373 definition of this tag. Since, in addition, we are currently
9374 processing a (member) template declaration of a template
9375 class, we must be very careful; consider:
9382 { template <class V>
9383 friend struct S1; };
9385 Here, the S2::S1 declaration should not be confused with the
9386 outer declaration. In particular, the inner version should
9387 have a template parameter of level 2, not level 1. This
9388 would be particularly important if the member declaration
9391 template <class V = U> friend struct S1;
9393 say, when we should tsubst into `U' when instantiating
9394 S2. On the other hand, when presented with:
9404 we must find the inner binding eventually. We
9405 accomplish this by making sure that the new type we
9406 create to represent this declaration has the right
9408 context = TYPE_CONTEXT (t);
9414 /* If no such tag is yet defined, create a forward-reference node
9415 and record it as the "definition".
9416 When a real declaration of this type is found,
9417 the forward-reference will be altered into a real type. */
9418 if (code == ENUMERAL_TYPE)
9420 error ("use of enum %q#D without previous declaration", name);
9421 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
9425 t = make_aggr_type (code);
9426 TYPE_CONTEXT (t) = context;
9427 t = pushtag (name, t, scope);
9432 if (template_header_p && IS_AGGR_TYPE (t))
9433 redeclare_class_template (t, current_template_parms);
9434 else if (!processing_template_decl
9436 && CLASSTYPE_IS_TEMPLATE (t))
9438 error ("redeclaration of %qT as a non-template", t);
9439 t = error_mark_node;
9442 /* Make injected friend class visible. */
9443 if (scope != ts_within_enclosing_non_class
9444 && hidden_name_p (TYPE_NAME (t)))
9446 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
9447 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
9449 if (TYPE_TEMPLATE_INFO (t))
9451 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
9452 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
9457 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t);
9461 xref_tag_from_type (tree old, tree id, tag_scope scope)
9463 enum tag_types tag_kind;
9465 if (TREE_CODE (old) == RECORD_TYPE)
9466 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
9468 tag_kind = union_type;
9470 if (id == NULL_TREE)
9471 id = TYPE_IDENTIFIER (old);
9473 return xref_tag (tag_kind, id, scope, false);
9476 /* Create the binfo hierarchy for REF with (possibly NULL) base list
9477 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
9478 access_* node, and the TREE_VALUE is the type of the base-class.
9479 Non-NULL TREE_TYPE indicates virtual inheritance. */
9482 xref_basetypes (tree ref, tree base_list)
9485 tree binfo, base_binfo;
9486 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
9487 unsigned max_bases = 0; /* Maximum direct bases. */
9489 tree default_access;
9490 tree igo_prev; /* Track Inheritance Graph Order. */
9492 if (ref == error_mark_node)
9495 /* The base of a derived class is private by default, all others are
9497 default_access = (TREE_CODE (ref) == RECORD_TYPE
9498 && CLASSTYPE_DECLARED_CLASS (ref)
9499 ? access_private_node : access_public_node);
9501 /* First, make sure that any templates in base-classes are
9502 instantiated. This ensures that if we call ourselves recursively
9503 we do not get confused about which classes are marked and which
9508 tree basetype = TREE_VALUE (*basep);
9510 if (!(processing_template_decl && uses_template_parms (basetype))
9511 && !complete_type_or_else (basetype, NULL))
9512 /* An incomplete type. Remove it from the list. */
9513 *basep = TREE_CHAIN (*basep);
9517 if (TREE_TYPE (*basep))
9519 if (CLASS_TYPE_P (basetype))
9520 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
9521 basep = &TREE_CHAIN (*basep);
9525 TYPE_MARKED_P (ref) = 1;
9527 /* The binfo slot should be empty, unless this is an (ill-formed)
9529 gcc_assert (!TYPE_BINFO (ref) || TYPE_SIZE (ref));
9530 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
9532 binfo = make_tree_binfo (max_bases);
9534 TYPE_BINFO (ref) = binfo;
9535 BINFO_OFFSET (binfo) = size_zero_node;
9536 BINFO_TYPE (binfo) = ref;
9540 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
9541 /* An aggregate cannot have baseclasses. */
9542 CLASSTYPE_NON_AGGREGATE (ref) = 1;
9544 if (TREE_CODE (ref) == UNION_TYPE)
9545 error ("derived union %qT invalid", ref);
9550 if (TYPE_FOR_JAVA (ref))
9551 error ("Java class %qT cannot have multiple bases", ref);
9556 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
9558 if (TYPE_FOR_JAVA (ref))
9559 error ("Java class %qT cannot have virtual bases", ref);
9562 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
9564 tree access = TREE_PURPOSE (base_list);
9565 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
9566 tree basetype = TREE_VALUE (base_list);
9568 if (access == access_default_node)
9569 access = default_access;
9571 if (TREE_CODE (basetype) == TYPE_DECL)
9572 basetype = TREE_TYPE (basetype);
9573 if (TREE_CODE (basetype) != RECORD_TYPE
9574 && TREE_CODE (basetype) != TYPENAME_TYPE
9575 && TREE_CODE (basetype) != TEMPLATE_TYPE_PARM
9576 && TREE_CODE (basetype) != BOUND_TEMPLATE_TEMPLATE_PARM)
9578 error ("base type %qT fails to be a struct or class type",
9583 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
9584 TYPE_FOR_JAVA (ref) = 1;
9586 base_binfo = NULL_TREE;
9587 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
9589 base_binfo = TYPE_BINFO (basetype);
9590 /* The original basetype could have been a typedef'd type. */
9591 basetype = BINFO_TYPE (base_binfo);
9593 /* Inherit flags from the base. */
9594 TYPE_HAS_NEW_OPERATOR (ref)
9595 |= TYPE_HAS_NEW_OPERATOR (basetype);
9596 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
9597 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
9598 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
9599 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
9600 CLASSTYPE_DIAMOND_SHAPED_P (ref)
9601 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
9602 CLASSTYPE_REPEATED_BASE_P (ref)
9603 |= CLASSTYPE_REPEATED_BASE_P (basetype);
9606 /* We must do this test after we've seen through a typedef
9608 if (TYPE_MARKED_P (basetype))
9610 if (basetype == ref)
9611 error ("recursive type %qT undefined", basetype);
9613 error ("duplicate base type %qT invalid", basetype);
9616 TYPE_MARKED_P (basetype) = 1;
9618 base_binfo = copy_binfo (base_binfo, basetype, ref,
9619 &igo_prev, via_virtual);
9620 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
9621 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
9623 BINFO_BASE_APPEND (binfo, base_binfo);
9624 BINFO_BASE_ACCESS_APPEND (binfo, access);
9627 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
9628 /* If we have space in the vbase vector, we must have shared at
9629 least one of them, and are therefore diamond shaped. */
9630 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
9632 /* Unmark all the types. */
9633 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
9634 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
9635 TYPE_MARKED_P (ref) = 0;
9637 /* Now see if we have a repeated base type. */
9638 if (!CLASSTYPE_REPEATED_BASE_P (ref))
9640 for (base_binfo = binfo; base_binfo;
9641 base_binfo = TREE_CHAIN (base_binfo))
9643 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
9645 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
9648 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
9650 for (base_binfo = binfo; base_binfo;
9651 base_binfo = TREE_CHAIN (base_binfo))
9652 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
9653 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
9660 /* Begin compiling the definition of an enumeration type.
9662 Returns the type object, as yet incomplete.
9663 Also records info about it so that build_enumerator
9664 may be used to declare the individual values as they are read. */
9667 start_enum (tree name)
9671 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
9673 /* If this is the real definition for a previous forward reference,
9674 fill in the contents in the same object that used to be the
9675 forward reference. */
9677 enumtype = lookup_and_check_tag (enum_type, name,
9678 /*tag_scope=*/ts_current,
9679 /*template_header_p=*/false);
9681 if (enumtype != NULL_TREE && TREE_CODE (enumtype) == ENUMERAL_TYPE)
9683 error ("multiple definition of %q#T", enumtype);
9684 error ("%Jprevious definition here", TYPE_MAIN_DECL (enumtype));
9685 /* Clear out TYPE_VALUES, and start again. */
9686 TYPE_VALUES (enumtype) = NULL_TREE;
9690 /* In case of error, make a dummy enum to allow parsing to
9692 if (enumtype == error_mark_node)
9693 name = make_anon_name ();
9695 enumtype = make_node (ENUMERAL_TYPE);
9696 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
9702 /* After processing and defining all the values of an enumeration type,
9703 install their decls in the enumeration type and finish it off.
9704 ENUMTYPE is the type object and VALUES a list of name-value pairs. */
9707 finish_enum (tree enumtype)
9716 bool use_short_enum;
9720 integer_type_kind itk;
9721 tree underlying_type = NULL_TREE;
9723 /* We built up the VALUES in reverse order. */
9724 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
9726 /* For an enum defined in a template, just set the type of the values;
9727 all further processing is postponed until the template is
9728 instantiated. We need to set the type so that tsubst of a CONST_DECL
9730 if (processing_template_decl)
9732 for (values = TYPE_VALUES (enumtype);
9734 values = TREE_CHAIN (values))
9735 TREE_TYPE (TREE_VALUE (values)) = enumtype;
9736 if (at_function_scope_p ())
9737 add_stmt (build_min (TAG_DEFN, enumtype));
9741 /* Determine the minimum and maximum values of the enumerators. */
9742 if (TYPE_VALUES (enumtype))
9744 minnode = maxnode = NULL_TREE;
9746 for (values = TYPE_VALUES (enumtype);
9748 values = TREE_CHAIN (values))
9750 decl = TREE_VALUE (values);
9752 /* [dcl.enum]: Following the closing brace of an enum-specifier,
9753 each enumerator has the type of its enumeration. Prior to the
9754 closing brace, the type of each enumerator is the type of its
9755 initializing value. */
9756 TREE_TYPE (decl) = enumtype;
9758 /* Update the minimum and maximum values, if appropriate. */
9759 value = DECL_INITIAL (decl);
9760 if (value == error_mark_node)
9761 value = integer_zero_node;
9762 /* Figure out what the minimum and maximum values of the
9765 minnode = maxnode = value;
9766 else if (tree_int_cst_lt (maxnode, value))
9768 else if (tree_int_cst_lt (value, minnode))
9775 If the enumerator-list is empty, the underlying type is as if
9776 the enumeration had a single enumerator with value 0. */
9777 minnode = maxnode = integer_zero_node;
9779 /* Compute the number of bits require to represent all values of the
9780 enumeration. We must do this before the type of MINNODE and
9781 MAXNODE are transformed, since min_precision relies on the
9782 TREE_TYPE of the value it is passed. */
9783 unsignedp = tree_int_cst_sgn (minnode) >= 0;
9784 lowprec = min_precision (minnode, unsignedp);
9785 highprec = min_precision (maxnode, unsignedp);
9786 precision = MAX (lowprec, highprec);
9788 /* Determine the underlying type of the enumeration.
9792 The underlying type of an enumeration is an integral type that
9793 can represent all the enumerator values defined in the
9794 enumeration. It is implementation-defined which integral type is
9795 used as the underlying type for an enumeration except that the
9796 underlying type shall not be larger than int unless the value of
9797 an enumerator cannot fit in an int or unsigned int.
9799 We use "int" or an "unsigned int" as the underlying type, even if
9800 a smaller integral type would work, unless the user has
9801 explicitly requested that we use the smallest possible type. The
9802 user can request that for all enumerations with a command line
9803 flag, or for just one enumeration with an attribute. */
9805 use_short_enum = flag_short_enums
9806 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
9808 for (itk = (use_short_enum ? itk_char : itk_int);
9812 underlying_type = integer_types[itk];
9813 if (TYPE_PRECISION (underlying_type) >= precision
9814 && TYPE_UNSIGNED (underlying_type) == unsignedp)
9817 if (itk == itk_none)
9821 IF no integral type can represent all the enumerator values, the
9822 enumeration is ill-formed. */
9823 error ("no integral type can represent all of the enumerator values "
9824 "for %qT", enumtype);
9825 precision = TYPE_PRECISION (long_long_integer_type_node);
9826 underlying_type = integer_types[itk_unsigned_long_long];
9829 /* Compute the minium and maximum values for the type.
9833 For an enumeration where emin is the smallest enumerator and emax
9834 is the largest, the values of the enumeration are the values of the
9835 underlying type in the range bmin to bmax, where bmin and bmax are,
9836 respectively, the smallest and largest values of the smallest bit-
9837 field that can store emin and emax. */
9839 /* The middle-end currently assumes that types with TYPE_PRECISION
9840 narrower than their underlying type are suitably zero or sign
9841 extended to fill their mode. g++ doesn't make these guarantees.
9842 Until the middle-end can represent such paradoxical types, we
9843 set the TYPE_PRECISION to the width of the underlying type. */
9844 TYPE_PRECISION (enumtype) = TYPE_PRECISION (underlying_type);
9846 set_min_and_max_values_for_integral_type (enumtype, precision, unsignedp);
9850 The value of sizeof() applied to an enumeration type, an object
9851 of an enumeration type, or an enumerator, is the value of sizeof()
9852 applied to the underlying type. */
9853 TYPE_SIZE (enumtype) = TYPE_SIZE (underlying_type);
9854 TYPE_SIZE_UNIT (enumtype) = TYPE_SIZE_UNIT (underlying_type);
9855 TYPE_MODE (enumtype) = TYPE_MODE (underlying_type);
9856 TYPE_ALIGN (enumtype) = TYPE_ALIGN (underlying_type);
9857 TYPE_USER_ALIGN (enumtype) = TYPE_USER_ALIGN (underlying_type);
9858 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (underlying_type);
9860 /* Convert each of the enumerators to the type of the underlying
9861 type of the enumeration. */
9862 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
9864 location_t saved_location;
9866 decl = TREE_VALUE (values);
9867 saved_location = input_location;
9868 input_location = DECL_SOURCE_LOCATION (decl);
9869 value = perform_implicit_conversion (underlying_type,
9870 DECL_INITIAL (decl));
9871 input_location = saved_location;
9873 /* Do not clobber shared ints. */
9874 value = copy_node (value);
9876 TREE_TYPE (value) = enumtype;
9877 DECL_INITIAL (decl) = value;
9878 TREE_VALUE (values) = value;
9881 /* Fix up all variant types of this enum type. */
9882 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
9884 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
9885 TYPE_MIN_VALUE (t) = TYPE_MIN_VALUE (enumtype);
9886 TYPE_MAX_VALUE (t) = TYPE_MAX_VALUE (enumtype);
9887 TYPE_SIZE (t) = TYPE_SIZE (enumtype);
9888 TYPE_SIZE_UNIT (t) = TYPE_SIZE_UNIT (enumtype);
9889 TYPE_MODE (t) = TYPE_MODE (enumtype);
9890 TYPE_PRECISION (t) = TYPE_PRECISION (enumtype);
9891 TYPE_ALIGN (t) = TYPE_ALIGN (enumtype);
9892 TYPE_USER_ALIGN (t) = TYPE_USER_ALIGN (enumtype);
9893 TYPE_UNSIGNED (t) = TYPE_UNSIGNED (enumtype);
9896 /* Finish debugging output for this type. */
9897 rest_of_type_compilation (enumtype, namespace_bindings_p ());
9900 /* Build and install a CONST_DECL for an enumeration constant of the
9901 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
9902 Assignment of sequential values by default is handled here. */
9905 build_enumerator (tree name, tree value, tree enumtype)
9911 /* If the VALUE was erroneous, pretend it wasn't there; that will
9912 result in the enum being assigned the next value in sequence. */
9913 if (value == error_mark_node)
9916 /* Remove no-op casts from the value. */
9918 STRIP_TYPE_NOPS (value);
9920 if (! processing_template_decl)
9922 /* Validate and default VALUE. */
9923 if (value != NULL_TREE)
9925 value = integral_constant_value (value);
9927 if (TREE_CODE (value) == INTEGER_CST)
9929 value = perform_integral_promotions (value);
9930 constant_expression_warning (value);
9934 error ("enumerator value for %qD not integer constant", name);
9939 /* Default based on previous value. */
9940 if (value == NULL_TREE)
9942 if (TYPE_VALUES (enumtype))
9945 unsigned HOST_WIDE_INT lo;
9949 /* The next value is the previous value plus one. We can
9950 safely assume that the previous value is an INTEGER_CST.
9951 add_double doesn't know the type of the target expression,
9952 so we must check with int_fits_type_p as well. */
9953 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
9954 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
9955 TREE_INT_CST_HIGH (prev_value),
9957 value = build_int_cst_wide (TREE_TYPE (prev_value), lo, hi);
9958 overflowed |= !int_fits_type_p (value, TREE_TYPE (prev_value));
9962 error ("overflow in enumeration values at %qD", name);
9963 value = error_mark_node;
9967 value = integer_zero_node;
9970 /* Remove no-op casts from the value. */
9971 STRIP_TYPE_NOPS (value);
9974 /* C++ associates enums with global, function, or class declarations. */
9975 context = current_scope ();
9977 /* Build the actual enumeration constant. Note that the enumeration
9978 constants have the type of their initializers until the
9979 enumeration is complete:
9983 Following the closing brace of an enum-specifier, each enumer-
9984 ator has the type of its enumeration. Prior to the closing
9985 brace, the type of each enumerator is the type of its
9988 In finish_enum we will reset the type. Of course, if we're
9989 processing a template, there may be no value. */
9990 type = value ? TREE_TYPE (value) : NULL_TREE;
9992 if (context && context == current_class_type)
9993 /* This enum declaration is local to the class. We need the full
9994 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
9995 decl = build_lang_decl (CONST_DECL, name, type);
9997 /* It's a global enum, or it's local to a function. (Note local to
9998 a function could mean local to a class method. */
9999 decl = build_decl (CONST_DECL, name, type);
10001 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
10002 TREE_CONSTANT (decl) = 1;
10003 TREE_INVARIANT (decl) = 1;
10004 TREE_READONLY (decl) = 1;
10005 DECL_INITIAL (decl) = value;
10007 if (context && context == current_class_type)
10008 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
10009 on the TYPE_FIELDS list for `S'. (That's so that you can say
10010 things like `S::i' later.) */
10011 finish_member_declaration (decl);
10015 /* Add this enumeration constant to the list for this type. */
10016 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
10020 /* We're defining DECL. Make sure that it's type is OK. */
10023 check_function_type (tree decl, tree current_function_parms)
10025 tree fntype = TREE_TYPE (decl);
10026 tree return_type = complete_type (TREE_TYPE (fntype));
10028 /* In a function definition, arg types must be complete. */
10029 require_complete_types_for_parms (current_function_parms);
10031 if (dependent_type_p (return_type))
10033 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
10035 tree args = TYPE_ARG_TYPES (fntype);
10037 error ("return type %q#T is incomplete", return_type);
10039 /* Make it return void instead. */
10040 if (TREE_CODE (fntype) == METHOD_TYPE)
10041 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
10043 TREE_CHAIN (args));
10045 fntype = build_function_type (void_type_node, args);
10047 = build_exception_variant (fntype,
10048 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
10051 abstract_virtuals_error (decl, TREE_TYPE (fntype));
10054 /* Create the FUNCTION_DECL for a function definition.
10055 DECLSPECS and DECLARATOR are the parts of the declaration;
10056 they describe the function's name and the type it returns,
10057 but twisted together in a fashion that parallels the syntax of C.
10059 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
10060 DECLARATOR is really the DECL for the function we are about to
10061 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
10062 indicating that the function is an inline defined in-class.
10064 This function creates a binding context for the function body
10065 as well as setting up the FUNCTION_DECL in current_function_decl.
10067 For C++, we must first check whether that datum makes any sense.
10068 For example, "class A local_a(1,2);" means that variable local_a
10069 is an aggregate of type A, which should have a constructor
10070 applied to it with the argument list [1, 2]. */
10073 start_preparsed_function (tree decl1, tree attrs, int flags)
10075 tree ctype = NULL_TREE;
10078 int doing_friend = 0;
10079 struct cp_binding_level *bl;
10080 tree current_function_parms;
10081 struct c_fileinfo *finfo
10082 = get_fileinfo (lbasename (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1))));
10083 bool honor_interface;
10085 /* Sanity check. */
10086 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
10087 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
10089 fntype = TREE_TYPE (decl1);
10090 if (TREE_CODE (fntype) == METHOD_TYPE)
10091 ctype = TYPE_METHOD_BASETYPE (fntype);
10093 /* ISO C++ 11.4/5. A friend function defined in a class is in
10094 the (lexical) scope of the class in which it is defined. */
10095 if (!ctype && DECL_FRIEND_P (decl1))
10097 ctype = DECL_FRIEND_CONTEXT (decl1);
10099 /* CTYPE could be null here if we're dealing with a template;
10100 for example, `inline friend float foo()' inside a template
10101 will have no CTYPE set. */
10102 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
10108 if (DECL_DECLARED_INLINE_P (decl1)
10109 && lookup_attribute ("noinline", attrs))
10110 warning (0, "inline function %q+D given attribute noinline", decl1);
10112 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
10113 /* This is a constructor, we must ensure that any default args
10114 introduced by this definition are propagated to the clones
10115 now. The clones are used directly in overload resolution. */
10116 adjust_clone_args (decl1);
10118 /* Sometimes we don't notice that a function is a static member, and
10119 build a METHOD_TYPE for it. Fix that up now. */
10120 if (ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
10121 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE)
10123 revert_static_member_fn (decl1);
10127 /* Set up current_class_type, and enter the scope of the class, if
10130 push_nested_class (ctype);
10131 else if (DECL_STATIC_FUNCTION_P (decl1))
10132 push_nested_class (DECL_CONTEXT (decl1));
10134 /* Now that we have entered the scope of the class, we must restore
10135 the bindings for any template parameters surrounding DECL1, if it
10136 is an inline member template. (Order is important; consider the
10137 case where a template parameter has the same name as a field of
10138 the class.) It is not until after this point that
10139 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
10140 if (flags & SF_INCLASS_INLINE)
10141 maybe_begin_member_template_processing (decl1);
10143 /* Effective C++ rule 15. */
10145 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
10146 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
10147 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
10149 /* Make the init_value nonzero so pushdecl knows this is not tentative.
10150 error_mark_node is replaced below (in poplevel) with the BLOCK. */
10151 if (!DECL_INITIAL (decl1))
10152 DECL_INITIAL (decl1) = error_mark_node;
10154 /* This function exists in static storage.
10155 (This does not mean `static' in the C sense!) */
10156 TREE_STATIC (decl1) = 1;
10158 /* We must call push_template_decl after current_class_type is set
10159 up. (If we are processing inline definitions after exiting a
10160 class scope, current_class_type will be NULL_TREE until set above
10161 by push_nested_class.) */
10162 if (processing_template_decl)
10164 /* FIXME: Handle error_mark_node more gracefully. */
10165 tree newdecl1 = push_template_decl (decl1);
10166 if (newdecl1 != error_mark_node)
10170 /* We are now in the scope of the function being defined. */
10171 current_function_decl = decl1;
10173 /* Save the parm names or decls from this function's declarator
10174 where store_parm_decls will find them. */
10175 current_function_parms = DECL_ARGUMENTS (decl1);
10177 /* Make sure the parameter and return types are reasonable. When
10178 you declare a function, these types can be incomplete, but they
10179 must be complete when you define the function. */
10180 check_function_type (decl1, current_function_parms);
10181 /* Make sure no default arg is missing. */
10182 check_default_args (decl1);
10184 /* Build the return declaration for the function. */
10185 restype = TREE_TYPE (fntype);
10186 /* Promote the value to int before returning it. */
10187 if (c_promoting_integer_type_p (restype))
10188 restype = type_promotes_to (restype);
10189 if (DECL_RESULT (decl1) == NULL_TREE)
10193 resdecl = build_decl (RESULT_DECL, 0, TYPE_MAIN_VARIANT (restype));
10194 DECL_ARTIFICIAL (resdecl) = 1;
10195 DECL_IGNORED_P (resdecl) = 1;
10196 DECL_RESULT (decl1) = resdecl;
10198 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
10201 /* Initialize RTL machinery. We cannot do this until
10202 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
10203 even when processing a template; this is how we get
10204 CFUN set up, and our per-function variables initialized.
10205 FIXME factor out the non-RTL stuff. */
10206 bl = current_binding_level;
10207 allocate_struct_function (decl1);
10208 current_binding_level = bl;
10210 /* Even though we're inside a function body, we still don't want to
10211 call expand_expr to calculate the size of a variable-sized array.
10212 We haven't necessarily assigned RTL to all variables yet, so it's
10213 not safe to try to expand expressions involving them. */
10214 cfun->x_dont_save_pending_sizes_p = 1;
10216 /* Start the statement-tree, start the tree now. */
10217 DECL_SAVED_TREE (decl1) = push_stmt_list ();
10219 /* Let the user know we're compiling this function. */
10220 announce_function (decl1);
10222 /* Record the decl so that the function name is defined.
10223 If we already have a decl for this name, and it is a FUNCTION_DECL,
10224 use the old decl. */
10225 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
10227 /* A specialization is not used to guide overload resolution. */
10228 if (!DECL_FUNCTION_MEMBER_P (decl1)
10229 && !(DECL_USE_TEMPLATE (decl1) &&
10230 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
10232 tree olddecl = pushdecl (decl1);
10234 if (olddecl == error_mark_node)
10235 /* If something went wrong when registering the declaration,
10236 use DECL1; we have to have a FUNCTION_DECL to use when
10237 parsing the body of the function. */
10240 /* Otherwise, OLDDECL is either a previous declaration of
10241 the same function or DECL1 itself. */
10246 /* We need to set the DECL_CONTEXT. */
10247 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
10248 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
10250 fntype = TREE_TYPE (decl1);
10252 /* If #pragma weak applies, mark the decl appropriately now.
10253 The pragma only applies to global functions. Because
10254 determining whether or not the #pragma applies involves
10255 computing the mangled name for the declaration, we cannot
10256 apply the pragma until after we have merged this declaration
10257 with any previous declarations; if the original declaration
10258 has a linkage specification, that specification applies to
10259 the definition as well, and may affect the mangled name. */
10260 if (!DECL_CONTEXT (decl1))
10261 maybe_apply_pragma_weak (decl1);
10264 /* Determine the ELF visibility attribute for the function. We must
10265 not do this before calling "pushdecl", as we must allow
10266 "duplicate_decls" to merge any attributes appropriately. */
10267 if (!DECL_CLONED_FUNCTION_P (decl1))
10268 determine_visibility (decl1);
10270 /* Reset these in case the call to pushdecl changed them. */
10271 current_function_decl = decl1;
10272 cfun->decl = decl1;
10274 /* If we are (erroneously) defining a function that we have already
10275 defined before, wipe out what we knew before. */
10276 if (!DECL_PENDING_INLINE_P (decl1))
10277 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
10279 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
10281 /* We know that this was set up by `grokclassfn'. We do not
10282 wait until `store_parm_decls', since evil parse errors may
10283 never get us to that point. Here we keep the consistency
10284 between `current_class_type' and `current_class_ptr'. */
10285 tree t = DECL_ARGUMENTS (decl1);
10287 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
10288 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
10290 cp_function_chain->x_current_class_ref
10291 = build_indirect_ref (t, NULL);
10292 cp_function_chain->x_current_class_ptr = t;
10294 /* Constructors and destructors need to know whether they're "in
10295 charge" of initializing virtual base classes. */
10296 t = TREE_CHAIN (t);
10297 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
10299 current_in_charge_parm = t;
10300 t = TREE_CHAIN (t);
10302 if (DECL_HAS_VTT_PARM_P (decl1))
10304 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
10305 current_vtt_parm = t;
10309 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
10310 /* Implicitly-defined methods (like the
10311 destructor for a class in which no destructor
10312 is explicitly declared) must not be defined
10313 until their definition is needed. So, we
10314 ignore interface specifications for
10315 compiler-generated functions. */
10316 && !DECL_ARTIFICIAL (decl1));
10318 if (DECL_INTERFACE_KNOWN (decl1))
10320 tree ctx = decl_function_context (decl1);
10322 if (DECL_NOT_REALLY_EXTERN (decl1))
10323 DECL_EXTERNAL (decl1) = 0;
10325 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
10326 && TREE_PUBLIC (ctx))
10327 /* This is a function in a local class in an extern inline
10329 comdat_linkage (decl1);
10331 /* If this function belongs to an interface, it is public.
10332 If it belongs to someone else's interface, it is also external.
10333 This only affects inlines and template instantiations. */
10334 else if (!finfo->interface_unknown && honor_interface)
10336 if (DECL_DECLARED_INLINE_P (decl1)
10337 || DECL_TEMPLATE_INSTANTIATION (decl1)
10338 || processing_template_decl)
10340 DECL_EXTERNAL (decl1)
10341 = (finfo->interface_only
10342 || (DECL_DECLARED_INLINE_P (decl1)
10343 && ! flag_implement_inlines
10344 && !DECL_VINDEX (decl1)));
10346 /* For WIN32 we also want to put these in linkonce sections. */
10347 maybe_make_one_only (decl1);
10350 DECL_EXTERNAL (decl1) = 0;
10351 DECL_INTERFACE_KNOWN (decl1) = 1;
10352 /* If this function is in an interface implemented in this file,
10353 make sure that the backend knows to emit this function
10355 if (!DECL_EXTERNAL (decl1))
10356 mark_needed (decl1);
10358 else if (finfo->interface_unknown && finfo->interface_only
10359 && honor_interface)
10361 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
10362 interface, we will have both finfo->interface_unknown and
10363 finfo->interface_only set. In that case, we don't want to
10364 use the normal heuristics because someone will supply a
10365 #pragma implementation elsewhere, and deducing it here would
10366 produce a conflict. */
10367 comdat_linkage (decl1);
10368 DECL_EXTERNAL (decl1) = 0;
10369 DECL_INTERFACE_KNOWN (decl1) = 1;
10370 DECL_DEFER_OUTPUT (decl1) = 1;
10374 /* This is a definition, not a reference.
10375 So clear DECL_EXTERNAL. */
10376 DECL_EXTERNAL (decl1) = 0;
10378 if ((DECL_DECLARED_INLINE_P (decl1)
10379 || DECL_TEMPLATE_INSTANTIATION (decl1))
10380 && ! DECL_INTERFACE_KNOWN (decl1)
10381 /* Don't try to defer nested functions for now. */
10382 && ! decl_function_context (decl1))
10383 DECL_DEFER_OUTPUT (decl1) = 1;
10385 DECL_INTERFACE_KNOWN (decl1) = 1;
10388 begin_scope (sk_function_parms, decl1);
10392 if (DECL_DESTRUCTOR_P (decl1)
10393 || (DECL_CONSTRUCTOR_P (decl1)
10394 && targetm.cxx.cdtor_returns_this ()))
10396 cdtor_label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
10397 DECL_CONTEXT (cdtor_label) = current_function_decl;
10400 start_fname_decls ();
10402 store_parm_decls (current_function_parms);
10406 /* Like start_preparsed_function, except that instead of a
10407 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
10409 Returns 1 on success. If the DECLARATOR is not suitable for a function
10410 (it defines a datum instead), we return 0, which tells
10411 yyparse to report a parse error. */
10414 start_function (cp_decl_specifier_seq *declspecs,
10415 const cp_declarator *declarator,
10420 if (have_extern_spec)
10422 declspecs->storage_class = sc_extern;
10423 /* This should only be done once on the outermost decl. */
10424 have_extern_spec = false;
10427 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
10428 /* If the declarator is not suitable for a function definition,
10429 cause a syntax error. */
10430 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
10433 if (DECL_MAIN_P (decl1))
10434 /* main must return int. grokfndecl should have corrected it
10435 (and issued a diagnostic) if the user got it wrong. */
10436 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
10437 integer_type_node));
10439 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
10444 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
10448 use_eh_spec_block (tree fn)
10450 return (flag_exceptions && flag_enforce_eh_specs
10451 && !processing_template_decl
10452 && TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn))
10453 /* We insert the EH_SPEC_BLOCK only in the original
10454 function; then, it is copied automatically to the
10456 && !DECL_CLONED_FUNCTION_P (fn)
10457 /* Implicitly-generated constructors and destructors have
10458 exception specifications. However, those specifications
10459 are the union of the possible exceptions specified by the
10460 constructors/destructors for bases and members, so no
10461 unallowed exception will ever reach this function. By
10462 not creating the EH_SPEC_BLOCK we save a little memory,
10463 and we avoid spurious warnings about unreachable
10465 && !DECL_ARTIFICIAL (fn));
10468 /* Store the parameter declarations into the current function declaration.
10469 This is called after parsing the parameter declarations, before
10470 digesting the body of the function.
10472 Also install to binding contour return value identifier, if any. */
10475 store_parm_decls (tree current_function_parms)
10477 tree fndecl = current_function_decl;
10480 /* This is a chain of any other decls that came in among the parm
10481 declarations. If a parm is declared with enum {foo, bar} x;
10482 then CONST_DECLs for foo and bar are put here. */
10483 tree nonparms = NULL_TREE;
10485 if (current_function_parms)
10487 /* This case is when the function was defined with an ANSI prototype.
10488 The parms already have decls, so we need not do anything here
10489 except record them as in effect
10490 and complain if any redundant old-style parm decls were written. */
10492 tree specparms = current_function_parms;
10495 /* Must clear this because it might contain TYPE_DECLs declared
10497 current_binding_level->names = NULL;
10499 /* If we're doing semantic analysis, then we'll call pushdecl
10500 for each of these. We must do them in reverse order so that
10501 they end in the correct forward order. */
10502 specparms = nreverse (specparms);
10504 for (parm = specparms; parm; parm = next)
10506 next = TREE_CHAIN (parm);
10507 if (TREE_CODE (parm) == PARM_DECL)
10509 if (DECL_NAME (parm) == NULL_TREE
10510 || TREE_CODE (parm) != VOID_TYPE)
10513 error ("parameter %qD declared void", parm);
10517 /* If we find an enum constant or a type tag,
10518 put it aside for the moment. */
10519 TREE_CHAIN (parm) = NULL_TREE;
10520 nonparms = chainon (nonparms, parm);
10524 /* Get the decls in their original chain order and record in the
10525 function. This is all and only the PARM_DECLs that were
10526 pushed into scope by the loop above. */
10527 DECL_ARGUMENTS (fndecl) = getdecls ();
10530 DECL_ARGUMENTS (fndecl) = NULL_TREE;
10532 /* Now store the final chain of decls for the arguments
10533 as the decl-chain of the current lexical scope.
10534 Put the enumerators in as well, at the front so that
10535 DECL_ARGUMENTS is not modified. */
10536 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
10538 if (use_eh_spec_block (current_function_decl))
10539 current_eh_spec_block = begin_eh_spec_block ();
10543 /* We have finished doing semantic analysis on DECL, but have not yet
10544 generated RTL for its body. Save away our current state, so that
10545 when we want to generate RTL later we know what to do. */
10548 save_function_data (tree decl)
10550 struct language_function *f;
10552 /* Save the language-specific per-function data so that we can
10553 get it back when we really expand this function. */
10554 gcc_assert (!DECL_PENDING_INLINE_P (decl));
10557 f = GGC_NEW (struct language_function);
10558 memcpy (f, cp_function_chain, sizeof (struct language_function));
10559 DECL_SAVED_FUNCTION_DATA (decl) = f;
10561 /* Clear out the bits we don't need. */
10562 f->base.x_stmt_tree.x_cur_stmt_list = NULL_TREE;
10563 f->x_named_label_uses = NULL;
10564 f->bindings = NULL;
10565 f->x_local_names = NULL;
10569 /* Set the return value of the constructor (if present). */
10572 finish_constructor_body (void)
10577 if (targetm.cxx.cdtor_returns_this ())
10579 /* Any return from a constructor will end up here. */
10580 add_stmt (build_stmt (LABEL_EXPR, cdtor_label));
10582 val = DECL_ARGUMENTS (current_function_decl);
10583 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
10584 DECL_RESULT (current_function_decl), val);
10585 /* Return the address of the object. */
10586 exprstmt = build_stmt (RETURN_EXPR, val);
10587 add_stmt (exprstmt);
10591 /* Do all the processing for the beginning of a destructor; set up the
10592 vtable pointers and cleanups for bases and members. */
10595 begin_destructor_body (void)
10597 tree compound_stmt;
10599 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
10600 issued an error message. We still want to try to process the
10601 body of the function, but initialize_vtbl_ptrs will crash if
10602 TYPE_BINFO is NULL. */
10603 if (COMPLETE_TYPE_P (current_class_type))
10605 compound_stmt = begin_compound_stmt (0);
10606 /* Make all virtual function table pointers in non-virtual base
10607 classes point to CURRENT_CLASS_TYPE's virtual function
10609 initialize_vtbl_ptrs (current_class_ptr);
10610 finish_compound_stmt (compound_stmt);
10612 /* And insert cleanups for our bases and members so that they
10613 will be properly destroyed if we throw. */
10614 push_base_cleanups ();
10618 /* At the end of every destructor we generate code to delete the object if
10619 necessary. Do that now. */
10622 finish_destructor_body (void)
10626 /* Any return from a destructor will end up here; that way all base
10627 and member cleanups will be run when the function returns. */
10628 add_stmt (build_stmt (LABEL_EXPR, cdtor_label));
10630 /* In a virtual destructor, we must call delete. */
10631 if (DECL_VIRTUAL_P (current_function_decl))
10634 tree virtual_size = cxx_sizeof (current_class_type);
10638 At the point of definition of a virtual destructor (including
10639 an implicit definition), non-placement operator delete shall
10640 be looked up in the scope of the destructor's class and if
10641 found shall be accessible and unambiguous. */
10642 exprstmt = build_op_delete_call
10643 (DELETE_EXPR, current_class_ptr, virtual_size,
10644 /*global_p=*/false, NULL_TREE);
10646 if_stmt = begin_if_stmt ();
10647 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
10648 current_in_charge_parm,
10651 finish_expr_stmt (exprstmt);
10652 finish_then_clause (if_stmt);
10653 finish_if_stmt (if_stmt);
10656 if (targetm.cxx.cdtor_returns_this ())
10660 val = DECL_ARGUMENTS (current_function_decl);
10661 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
10662 DECL_RESULT (current_function_decl), val);
10663 /* Return the address of the object. */
10664 exprstmt = build_stmt (RETURN_EXPR, val);
10665 add_stmt (exprstmt);
10669 /* Do the necessary processing for the beginning of a function body, which
10670 in this case includes member-initializers, but not the catch clauses of
10671 a function-try-block. Currently, this means opening a binding level
10672 for the member-initializers (in a ctor) and member cleanups (in a dtor). */
10675 begin_function_body (void)
10679 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
10682 if (processing_template_decl)
10683 /* Do nothing now. */;
10685 /* Always keep the BLOCK node associated with the outermost pair of
10686 curly braces of a function. These are needed for correct
10687 operation of dwarfout.c. */
10688 keep_next_level (true);
10690 stmt = begin_compound_stmt (BCS_FN_BODY);
10692 if (processing_template_decl)
10693 /* Do nothing now. */;
10694 else if (DECL_DESTRUCTOR_P (current_function_decl))
10695 begin_destructor_body ();
10700 /* Do the processing for the end of a function body. Currently, this means
10701 closing out the cleanups for fully-constructed bases and members, and in
10702 the case of the destructor, deleting the object if desired. Again, this
10703 is only meaningful for [cd]tors, since they are the only functions where
10704 there is a significant distinction between the main body and any
10705 function catch clauses. Handling, say, main() return semantics here
10706 would be wrong, as flowing off the end of a function catch clause for
10707 main() would also need to return 0. */
10710 finish_function_body (tree compstmt)
10712 if (compstmt == NULL_TREE)
10715 /* Close the block. */
10716 finish_compound_stmt (compstmt);
10718 if (processing_template_decl)
10719 /* Do nothing now. */;
10720 else if (DECL_CONSTRUCTOR_P (current_function_decl))
10721 finish_constructor_body ();
10722 else if (DECL_DESTRUCTOR_P (current_function_decl))
10723 finish_destructor_body ();
10726 /* Given a function, returns the BLOCK corresponding to the outermost level
10727 of curly braces, skipping the artificial block created for constructor
10731 outer_curly_brace_block (tree fndecl)
10733 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
10734 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
10735 /* Skip the artificial function body block. */
10736 block = BLOCK_SUBBLOCKS (block);
10740 /* Finish up a function declaration and compile that function
10741 all the way to assembler language output. The free the storage
10742 for the function definition.
10744 FLAGS is a bitwise or of the following values:
10746 We just finished processing the body of an in-class inline
10747 function definition. (This processing will have taken place
10748 after the class definition is complete.) */
10751 finish_function (int flags)
10753 tree fndecl = current_function_decl;
10754 tree fntype, ctype = NULL_TREE;
10755 int inclass_inline = (flags & 2) != 0;
10758 /* When we get some parse errors, we can end up without a
10759 current_function_decl, so cope. */
10760 if (fndecl == NULL_TREE)
10761 return error_mark_node;
10763 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
10764 && DECL_VIRTUAL_P (fndecl)
10765 && !processing_template_decl)
10767 tree fnclass = DECL_CONTEXT (fndecl);
10768 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
10769 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
10772 nested = function_depth > 1;
10773 fntype = TREE_TYPE (fndecl);
10775 /* TREE_READONLY (fndecl) = 1;
10776 This caused &foo to be of type ptr-to-const-function
10777 which then got a warning when stored in a ptr-to-function variable. */
10779 gcc_assert (building_stmt_tree ());
10781 /* For a cloned function, we've already got all the code we need;
10782 there's no need to add any extra bits. */
10783 if (!DECL_CLONED_FUNCTION_P (fndecl))
10785 if (DECL_MAIN_P (current_function_decl))
10789 /* Make it so that `main' always returns 0 by default (or
10792 stmt = finish_return_stmt (integer_one_node);
10794 stmt = finish_return_stmt (integer_zero_node);
10796 /* Hack. We don't want the middle-end to warn that this
10797 return is unreachable, so put the statement on the
10799 #ifdef USE_MAPPED_LOCATION
10800 SET_EXPR_LOCATION (stmt, UNKNOWN_LOCATION);
10802 annotate_with_file_line (stmt, input_filename, 0);
10806 if (use_eh_spec_block (current_function_decl))
10807 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
10808 (TREE_TYPE (current_function_decl)),
10809 current_eh_spec_block);
10812 /* If we're saving up tree structure, tie off the function now. */
10813 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
10815 finish_fname_decls ();
10817 /* If this function can't throw any exceptions, remember that. */
10818 if (!processing_template_decl
10819 && !cp_function_chain->can_throw
10820 && !flag_non_call_exceptions)
10821 TREE_NOTHROW (fndecl) = 1;
10823 /* This must come after expand_function_end because cleanups might
10824 have declarations (from inline functions) that need to go into
10825 this function's blocks. */
10827 /* If the current binding level isn't the outermost binding level
10828 for this function, either there is a bug, or we have experienced
10829 syntax errors and the statement tree is malformed. */
10830 if (current_binding_level->kind != sk_function_parms)
10832 /* Make sure we have already experienced errors. */
10833 gcc_assert (errorcount);
10835 /* Throw away the broken statement tree and extra binding
10837 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
10839 while (current_binding_level->kind != sk_function_parms)
10841 if (current_binding_level->kind == sk_class)
10842 pop_nested_class ();
10844 poplevel (0, 0, 0);
10847 poplevel (1, 0, 1);
10849 /* Statements should always be full-expressions at the outermost set
10850 of curly braces for a function. */
10851 gcc_assert (stmts_are_full_exprs_p ());
10853 /* Set up the named return value optimization, if we can. Candidate
10854 variables are selected in check_return_value. */
10855 if (current_function_return_value)
10857 tree r = current_function_return_value;
10860 if (r != error_mark_node
10861 /* This is only worth doing for fns that return in memory--and
10862 simpler, since we don't have to worry about promoted modes. */
10863 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
10864 /* Only allow this for variables declared in the outer scope of
10865 the function so we know that their lifetime always ends with a
10866 return; see g++.dg/opt/nrv6.C. We could be more flexible if
10867 we were to do this optimization in tree-ssa. */
10868 && (outer = outer_curly_brace_block (fndecl))
10869 && chain_member (r, BLOCK_VARS (outer)))
10870 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
10872 current_function_return_value = NULL_TREE;
10875 /* Remember that we were in class scope. */
10876 if (current_class_name)
10877 ctype = current_class_type;
10879 /* Must mark the RESULT_DECL as being in this function. */
10880 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
10882 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
10883 to the FUNCTION_DECL node itself. */
10884 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
10886 /* Save away current state, if appropriate. */
10887 if (!processing_template_decl)
10888 save_function_data (fndecl);
10890 /* Complain if there's just no return statement. */
10891 if (warn_return_type
10892 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
10893 && !dependent_type_p (TREE_TYPE (fntype))
10894 && !current_function_returns_value && !current_function_returns_null
10895 /* Don't complain if we abort or throw. */
10896 && !current_function_returns_abnormally
10897 && !DECL_NAME (DECL_RESULT (fndecl))
10898 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
10899 inline function, as we might never be compiled separately. */
10900 && (DECL_INLINE (fndecl) || processing_template_decl)
10901 /* Structor return values (if any) are set by the compiler. */
10902 && !DECL_CONSTRUCTOR_P (fndecl)
10903 && !DECL_DESTRUCTOR_P (fndecl))
10904 warning (OPT_Wreturn_type, "no return statement in function returning non-void");
10906 /* Store the end of the function, so that we get good line number
10907 info for the epilogue. */
10908 cfun->function_end_locus = input_location;
10910 /* Genericize before inlining. */
10911 if (!processing_template_decl)
10913 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
10914 cp_genericize (fndecl);
10915 /* Clear out the bits we don't need. */
10916 f->x_current_class_ptr = NULL;
10917 f->x_current_class_ref = NULL;
10918 f->x_eh_spec_block = NULL;
10919 f->x_in_charge_parm = NULL;
10920 f->x_vtt_parm = NULL;
10921 f->x_return_value = NULL;
10922 f->bindings = NULL;
10924 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
10925 c_warn_unused_result (&DECL_SAVED_TREE (fndecl));
10927 /* Clear out the bits we don't need. */
10928 local_names = NULL;
10929 named_label_uses = NULL;
10931 /* We're leaving the context of this function, so zap cfun. It's still in
10932 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
10934 current_function_decl = NULL;
10936 /* If this is an in-class inline definition, we may have to pop the
10937 bindings for the template parameters that we added in
10938 maybe_begin_member_template_processing when start_function was
10940 if (inclass_inline)
10941 maybe_end_member_template_processing ();
10943 /* Leave the scope of the class. */
10945 pop_nested_class ();
10951 /* Let the error reporting routines know that we're outside a
10952 function. For a nested function, this value is used in
10953 cxx_pop_function_context and then reset via pop_function_context. */
10954 current_function_decl = NULL_TREE;
10959 /* Create the FUNCTION_DECL for a function definition.
10960 DECLSPECS and DECLARATOR are the parts of the declaration;
10961 they describe the return type and the name of the function,
10962 but twisted together in a fashion that parallels the syntax of C.
10964 This function creates a binding context for the function body
10965 as well as setting up the FUNCTION_DECL in current_function_decl.
10967 Returns a FUNCTION_DECL on success.
10969 If the DECLARATOR is not suitable for a function (it defines a datum
10970 instead), we return 0, which tells yyparse to report a parse error.
10972 May return void_type_node indicating that this method is actually
10973 a friend. See grokfield for more details.
10975 Came here with a `.pushlevel' .
10977 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
10978 CHANGES TO CODE IN `grokfield'. */
10981 start_method (cp_decl_specifier_seq *declspecs,
10982 const cp_declarator *declarator, tree attrlist)
10984 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
10987 if (fndecl == error_mark_node)
10988 return error_mark_node;
10990 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
10992 error ("invalid member function declaration");
10993 return error_mark_node;
10997 cplus_decl_attributes (&fndecl, attrlist, 0);
10999 /* Pass friends other than inline friend functions back. */
11000 if (fndecl == void_type_node)
11003 if (DECL_IN_AGGR_P (fndecl))
11005 if (DECL_CONTEXT (fndecl)
11006 && TREE_CODE( DECL_CONTEXT (fndecl)) != NAMESPACE_DECL)
11007 error ("%qD is already defined in class %qT", fndecl,
11008 DECL_CONTEXT (fndecl));
11009 return error_mark_node;
11012 check_template_shadow (fndecl);
11014 DECL_DECLARED_INLINE_P (fndecl) = 1;
11015 if (flag_default_inline)
11016 DECL_INLINE (fndecl) = 1;
11018 /* We process method specializations in finish_struct_1. */
11019 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
11021 fndecl = push_template_decl (fndecl);
11022 if (fndecl == error_mark_node)
11026 if (! DECL_FRIEND_P (fndecl))
11028 if (TREE_CHAIN (fndecl))
11030 fndecl = copy_node (fndecl);
11031 TREE_CHAIN (fndecl) = NULL_TREE;
11033 grok_special_member_properties (fndecl);
11036 cp_finish_decl (fndecl, NULL_TREE, NULL_TREE, 0);
11038 /* Make a place for the parms. */
11039 begin_scope (sk_function_parms, fndecl);
11041 DECL_IN_AGGR_P (fndecl) = 1;
11045 /* Go through the motions of finishing a function definition.
11046 We don't compile this method until after the whole class has
11049 FINISH_METHOD must return something that looks as though it
11050 came from GROKFIELD (since we are defining a method, after all).
11052 This is called after parsing the body of the function definition.
11053 STMTS is the chain of statements that makes up the function body.
11055 DECL is the ..._DECL that `start_method' provided. */
11058 finish_method (tree decl)
11060 tree fndecl = decl;
11065 if (decl == void_type_node)
11068 old_initial = DECL_INITIAL (fndecl);
11070 /* Undo the level for the parms (from start_method).
11071 This is like poplevel, but it causes nothing to be
11072 saved. Saving information here confuses symbol-table
11073 output routines. Besides, this information will
11074 be correctly output when this method is actually
11077 /* Clear out the meanings of the local variables of this level;
11078 also record in each decl which block it belongs to. */
11080 for (link = current_binding_level->names; link; link = TREE_CHAIN (link))
11082 if (DECL_NAME (link) != NULL_TREE)
11083 pop_binding (DECL_NAME (link), link);
11084 gcc_assert (TREE_CODE (link) != FUNCTION_DECL);
11085 DECL_CONTEXT (link) = NULL_TREE;
11088 poplevel (0, 0, 0);
11090 DECL_INITIAL (fndecl) = old_initial;
11092 /* We used to check if the context of FNDECL was different from
11093 current_class_type as another way to get inside here. This didn't work
11094 for String.cc in libg++. */
11095 if (DECL_FRIEND_P (fndecl))
11097 VEC_safe_push (tree, gc, CLASSTYPE_INLINE_FRIENDS (current_class_type),
11099 decl = void_type_node;
11106 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
11107 we can lay it out later, when and if its type becomes complete. */
11110 maybe_register_incomplete_var (tree var)
11112 gcc_assert (TREE_CODE (var) == VAR_DECL);
11114 /* Keep track of variables with incomplete types. */
11115 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
11116 && DECL_EXTERNAL (var))
11118 tree inner_type = TREE_TYPE (var);
11120 while (TREE_CODE (inner_type) == ARRAY_TYPE)
11121 inner_type = TREE_TYPE (inner_type);
11122 inner_type = TYPE_MAIN_VARIANT (inner_type);
11124 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
11125 /* RTTI TD entries are created while defining the type_info. */
11126 || (TYPE_LANG_SPECIFIC (inner_type)
11127 && TYPE_BEING_DEFINED (inner_type)))
11128 incomplete_vars = tree_cons (inner_type, var, incomplete_vars);
11132 /* Called when a class type (given by TYPE) is defined. If there are
11133 any existing VAR_DECLs whose type hsa been completed by this
11134 declaration, update them now. */
11137 complete_vars (tree type)
11139 tree *list = &incomplete_vars;
11141 gcc_assert (CLASS_TYPE_P (type));
11144 if (same_type_p (type, TREE_PURPOSE (*list)))
11146 tree var = TREE_VALUE (*list);
11147 tree type = TREE_TYPE (var);
11148 /* Complete the type of the variable. The VAR_DECL itself
11149 will be laid out in expand_expr. */
11150 complete_type (type);
11151 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
11152 /* Remove this entry from the list. */
11153 *list = TREE_CHAIN (*list);
11156 list = &TREE_CHAIN (*list);
11159 /* Check for pending declarations which may have abstract type. */
11160 complete_type_check_abstract (type);
11163 /* If DECL is of a type which needs a cleanup, build that cleanup
11167 cxx_maybe_build_cleanup (tree decl)
11169 tree type = TREE_TYPE (decl);
11171 if (type != error_mark_node && TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
11173 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
11175 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
11176 && CLASSTYPE_VBASECLASSES (type));
11178 if (TREE_CODE (type) == ARRAY_TYPE)
11182 cxx_mark_addressable (decl);
11183 rval = build_unary_op (ADDR_EXPR, decl, 0);
11186 /* Optimize for space over speed here. */
11187 if (!has_vbases || flag_expensive_optimizations)
11188 flags |= LOOKUP_NONVIRTUAL;
11190 rval = build_delete (TREE_TYPE (rval), rval,
11191 sfk_complete_destructor, flags, 0);
11198 /* When a stmt has been parsed, this function is called. */
11205 /* DECL was originally constructed as a non-static member function,
11206 but turned out to be static. Update it accordingly. */
11209 revert_static_member_fn (tree decl)
11212 tree function = TREE_TYPE (decl);
11213 tree args = TYPE_ARG_TYPES (function);
11215 if (cp_type_quals (TREE_TYPE (TREE_VALUE (args)))
11216 != TYPE_UNQUALIFIED)
11217 error ("static member function %q#D declared with type qualifiers", decl);
11219 args = TREE_CHAIN (args);
11220 tmp = build_function_type (TREE_TYPE (function), args);
11221 tmp = build_qualified_type (tmp, cp_type_quals (function));
11222 tmp = build_exception_variant (tmp,
11223 TYPE_RAISES_EXCEPTIONS (function));
11224 TREE_TYPE (decl) = tmp;
11225 if (DECL_ARGUMENTS (decl))
11226 DECL_ARGUMENTS (decl) = TREE_CHAIN (DECL_ARGUMENTS (decl));
11227 DECL_STATIC_FUNCTION_P (decl) = 1;
11230 /* Initialize the variables used during compilation of a C++
11234 cxx_push_function_context (struct function * f)
11236 struct language_function *p = GGC_CNEW (struct language_function);
11239 /* Whenever we start a new function, we destroy temporaries in the
11241 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
11247 if (DECL_SAVED_FUNCTION_DATA (fn))
11249 /* If we already parsed this function, and we're just expanding it
11250 now, restore saved state. */
11251 *cp_function_chain = *DECL_SAVED_FUNCTION_DATA (fn);
11253 /* We don't need the saved data anymore. Unless this is an inline
11254 function; we need the named return value info for
11255 declare_return_variable. */
11256 if (! DECL_INLINE (fn))
11257 DECL_SAVED_FUNCTION_DATA (fn) = NULL;
11262 /* Free the language-specific parts of F, now that we've finished
11263 compiling the function. */
11266 cxx_pop_function_context (struct function * f)
11271 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
11272 one of the language-independent trees. */
11274 enum cp_tree_node_structure_enum
11275 cp_tree_node_structure (union lang_tree_node * t)
11277 switch (TREE_CODE (&t->generic))
11279 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
11280 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
11281 case OVERLOAD: return TS_CP_OVERLOAD;
11282 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
11283 case TINST_LEVEL: return TS_CP_TINST_LEVEL;
11284 case PTRMEM_CST: return TS_CP_PTRMEM;
11285 case BASELINK: return TS_CP_BASELINK;
11286 default: return TS_CP_GENERIC;
11290 /* Build the void_list_node (void_type_node having been created). */
11292 build_void_list_node (void)
11294 tree t = build_tree_list (NULL_TREE, void_type_node);
11299 cp_missing_noreturn_ok_p (tree decl)
11301 /* A missing noreturn is ok for the `main' function. */
11302 return DECL_MAIN_P (decl);
11305 /* Return the COMDAT group into which DECL should be placed. */
11308 cxx_comdat_group (tree decl)
11312 /* Virtual tables, construction virtual tables, and virtual table
11313 tables all go in a single COMDAT group, named after the primary
11315 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
11316 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
11317 /* For all other DECLs, the COMDAT group is the mangled name of the
11318 declaration itself. */
11321 while (DECL_THUNK_P (decl))
11323 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
11324 into the same section as the target function. In that case
11325 we must return target's name. */
11326 tree target = THUNK_TARGET (decl);
11327 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
11328 && DECL_SECTION_NAME (target) != NULL
11329 && DECL_ONE_ONLY (target))
11334 name = DECL_ASSEMBLER_NAME (decl);
11337 return IDENTIFIER_POINTER (name);
11340 #include "gt-cp-decl.h"