1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
4 Contributed by Michael Tiemann (tiemann@cygnus.com)
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2, or (at your option)
13 GCC is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING. If not, write to
20 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
21 Boston, MA 02110-1301, USA. */
24 /* Process declarations and symbol lookup for C++ front end.
25 Also constructs types; the standard scalar types at initialization,
26 and structure, union, array and enum types when they are declared. */
28 /* ??? not all decl nodes are given the most useful possible
29 line numbers. For example, the CONST_DECLs for enum values. */
33 #include "coretypes.h"
40 #include "tree-inline.h"
50 #include "diagnostic.h"
53 #include "tree-flow.h"
55 static tree grokparms (cp_parameter_declarator *, tree *);
56 static const char *redeclaration_error_message (tree, tree);
58 static int decl_jump_unsafe (tree);
59 static void require_complete_types_for_parms (tree);
60 static int ambi_op_p (enum tree_code);
61 static int unary_op_p (enum tree_code);
62 static void push_local_name (tree);
63 static tree grok_reference_init (tree, tree, tree, tree *);
64 static tree grokvardecl (tree, tree, const cp_decl_specifier_seq *,
66 static void record_unknown_type (tree, const char *);
67 static tree builtin_function_1 (const char *, tree, tree,
68 enum built_in_function code,
69 enum built_in_class cl, const char *,
71 static tree build_library_fn_1 (tree, enum tree_code, tree);
72 static int member_function_or_else (tree, tree, enum overload_flags);
73 static void bad_specifiers (tree, const char *, int, int, int, int,
75 static void check_for_uninitialized_const_var (tree);
76 static hashval_t typename_hash (const void *);
77 static int typename_compare (const void *, const void *);
78 static tree local_variable_p_walkfn (tree *, int *, void *);
79 static tree record_builtin_java_type (const char *, int);
80 static const char *tag_name (enum tag_types);
81 static tree lookup_and_check_tag (enum tag_types, tree, tag_scope, bool);
82 static int walk_namespaces_r (tree, walk_namespaces_fn, void *);
83 static tree make_label_decl (tree, int);
84 static void use_label (tree);
85 static void check_previous_goto_1 (tree, struct cp_binding_level *, tree,
87 static void check_previous_goto (struct named_label_use_list *);
88 static void check_switch_goto (struct cp_binding_level *);
89 static void check_previous_gotos (tree);
90 static void pop_label (tree, tree);
91 static void pop_labels (tree);
92 static void maybe_deduce_size_from_array_init (tree, tree);
93 static void layout_var_decl (tree);
94 static void maybe_commonize_var (tree);
95 static tree check_initializer (tree, tree, int, tree *);
96 static void make_rtl_for_nonlocal_decl (tree, tree, const char *);
97 static void save_function_data (tree);
98 static void check_function_type (tree, tree);
99 static void finish_constructor_body (void);
100 static void begin_destructor_body (void);
101 static void finish_destructor_body (void);
102 static tree create_array_type_for_decl (tree, tree, tree);
103 static tree get_atexit_node (void);
104 static tree get_dso_handle_node (void);
105 static tree start_cleanup_fn (void);
106 static void end_cleanup_fn (void);
107 static tree cp_make_fname_decl (tree, int);
108 static void initialize_predefined_identifiers (void);
109 static tree check_special_function_return_type
110 (special_function_kind, tree, tree);
111 static tree push_cp_library_fn (enum tree_code, tree);
112 static tree build_cp_library_fn (tree, enum tree_code, tree);
113 static void store_parm_decls (tree);
114 static void initialize_local_var (tree, tree);
115 static void expand_static_init (tree, tree);
116 static tree next_initializable_field (tree);
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 (warn_unused_label && !TREE_USED (label))
365 warning (0, "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 (0, "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))
1123 warning (0, "shadowing %s function %q#D",
1124 DECL_BUILT_IN (olddecl) ? "built-in" : "library",
1126 /* Discard the old built-in function. */
1129 /* If the built-in is not ansi, then programs can override
1130 it even globally without an error. */
1131 else if (! DECL_BUILT_IN (olddecl))
1132 warning (0, "library function %q#D redeclared as non-function %q#D",
1136 error ("declaration of %q#D", newdecl);
1137 error ("conflicts with built-in declaration %q#D",
1142 else if (!types_match)
1144 /* Avoid warnings redeclaring built-ins which have not been
1145 explicitly declared. */
1146 if (DECL_ANTICIPATED (olddecl))
1148 /* Deal with fileptr_type_node. FILE type is not known
1149 at the time we create the builtins. */
1152 for (t1 = TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1153 t2 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1155 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1158 else if (TREE_VALUE (t2) == fileptr_type_node)
1160 tree t = TREE_VALUE (t1);
1162 if (TREE_CODE (t) == POINTER_TYPE
1163 && TYPE_NAME (TREE_TYPE (t))
1164 && DECL_NAME (TYPE_NAME (TREE_TYPE (t)))
1165 == get_identifier ("FILE")
1166 && compparms (TREE_CHAIN (t1), TREE_CHAIN (t2)))
1168 tree oldargs = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1170 TYPE_ARG_TYPES (TREE_TYPE (olddecl))
1171 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1172 types_match = decls_match (newdecl, olddecl);
1174 return duplicate_decls (newdecl, olddecl,
1176 TYPE_ARG_TYPES (TREE_TYPE (olddecl)) = oldargs;
1179 else if (! same_type_p (TREE_VALUE (t1), TREE_VALUE (t2)))
1182 else if ((DECL_EXTERN_C_P (newdecl)
1183 && DECL_EXTERN_C_P (olddecl))
1184 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1185 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1187 /* A near match; override the builtin. */
1189 if (TREE_PUBLIC (newdecl))
1191 warning (0, "new declaration %q#D", newdecl);
1192 warning (0, "ambiguates built-in declaration %q#D",
1195 else if (warn_shadow)
1196 warning (0, "shadowing %s function %q#D",
1197 DECL_BUILT_IN (olddecl) ? "built-in" : "library",
1201 /* Discard the old built-in function. */
1204 /* Replace the old RTL to avoid problems with inlining. */
1205 COPY_DECL_RTL (newdecl, olddecl);
1207 /* Even if the types match, prefer the new declarations type for
1208 built-ins which have not been explicitly declared, for
1209 exception lists, etc... */
1210 else if (DECL_ANTICIPATED (olddecl))
1212 tree type = TREE_TYPE (newdecl);
1213 tree attribs = (*targetm.merge_type_attributes)
1214 (TREE_TYPE (olddecl), type);
1216 type = cp_build_type_attribute_variant (type, attribs);
1217 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = type;
1220 /* Whether or not the builtin can throw exceptions has no
1221 bearing on this declarator. */
1222 TREE_NOTHROW (olddecl) = 0;
1224 if (DECL_THIS_STATIC (newdecl) && !DECL_THIS_STATIC (olddecl))
1226 /* If a builtin function is redeclared as `static', merge
1227 the declarations, but make the original one static. */
1228 DECL_THIS_STATIC (olddecl) = 1;
1229 TREE_PUBLIC (olddecl) = 0;
1231 /* Make the old declaration consistent with the new one so
1232 that all remnants of the builtin-ness of this function
1233 will be banished. */
1234 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1235 COPY_DECL_RTL (newdecl, olddecl);
1238 else if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1240 if ((TREE_CODE (olddecl) == TYPE_DECL && DECL_ARTIFICIAL (olddecl)
1241 && TREE_CODE (newdecl) != TYPE_DECL
1242 && ! (TREE_CODE (newdecl) == TEMPLATE_DECL
1243 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL))
1244 || (TREE_CODE (newdecl) == TYPE_DECL && DECL_ARTIFICIAL (newdecl)
1245 && TREE_CODE (olddecl) != TYPE_DECL
1246 && ! (TREE_CODE (olddecl) == TEMPLATE_DECL
1247 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
1250 /* We do nothing special here, because C++ does such nasty
1251 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1252 get shadowed, and know that if we need to find a TYPE_DECL
1253 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1254 slot of the identifier. */
1258 if ((TREE_CODE (newdecl) == FUNCTION_DECL
1259 && DECL_FUNCTION_TEMPLATE_P (olddecl))
1260 || (TREE_CODE (olddecl) == FUNCTION_DECL
1261 && DECL_FUNCTION_TEMPLATE_P (newdecl)))
1264 error ("%q#D redeclared as different kind of symbol", newdecl);
1265 if (TREE_CODE (olddecl) == TREE_LIST)
1266 olddecl = TREE_VALUE (olddecl);
1267 error ("previous declaration of %q+#D", olddecl);
1269 return error_mark_node;
1271 else if (!types_match)
1273 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
1274 /* These are certainly not duplicate declarations; they're
1275 from different scopes. */
1278 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1280 /* The name of a class template may not be declared to refer to
1281 any other template, class, function, object, namespace, value,
1282 or type in the same scope. */
1283 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == TYPE_DECL
1284 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1286 error ("declaration of template %q#D", newdecl);
1287 error ("conflicts with previous declaration %q+#D", olddecl);
1289 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == FUNCTION_DECL
1290 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == FUNCTION_DECL
1291 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl))),
1292 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl))))
1293 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1294 DECL_TEMPLATE_PARMS (olddecl))
1295 /* Template functions can be disambiguated by
1297 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl)),
1298 TREE_TYPE (TREE_TYPE (olddecl))))
1300 error ("new declaration %q#D", newdecl);
1301 error ("ambiguates old declaration %q+#D", olddecl);
1305 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1307 if (DECL_EXTERN_C_P (newdecl) && DECL_EXTERN_C_P (olddecl))
1309 error ("declaration of C function %q#D conflicts with",
1311 error ("previous declaration %q+#D here", olddecl);
1313 else if (compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1314 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1316 error ("new declaration %q#D", newdecl);
1317 error ("ambiguates old declaration %q+#D", olddecl);
1324 error ("conflicting declaration %q#D", newdecl);
1325 error ("%q+D has a previous declaration as %q#D", olddecl, olddecl);
1326 return error_mark_node;
1329 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1330 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1331 && (!DECL_TEMPLATE_INFO (newdecl)
1332 || (DECL_TI_TEMPLATE (newdecl)
1333 != DECL_TI_TEMPLATE (olddecl))))
1334 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1335 && (!DECL_TEMPLATE_INFO (olddecl)
1336 || (DECL_TI_TEMPLATE (olddecl)
1337 != DECL_TI_TEMPLATE (newdecl))))))
1338 /* It's OK to have a template specialization and a non-template
1339 with the same type, or to have specializations of two
1340 different templates with the same type. Note that if one is a
1341 specialization, and the other is an instantiation of the same
1342 template, that we do not exit at this point. That situation
1343 can occur if we instantiate a template class, and then
1344 specialize one of its methods. This situation is valid, but
1345 the declarations must be merged in the usual way. */
1347 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1348 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1349 && !DECL_USE_TEMPLATE (newdecl))
1350 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1351 && !DECL_USE_TEMPLATE (olddecl))))
1352 /* One of the declarations is a template instantiation, and the
1353 other is not a template at all. That's OK. */
1355 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1357 /* In [namespace.alias] we have:
1359 In a declarative region, a namespace-alias-definition can be
1360 used to redefine a namespace-alias declared in that declarative
1361 region to refer only to the namespace to which it already
1364 Therefore, if we encounter a second alias directive for the same
1365 alias, we can just ignore the second directive. */
1366 if (DECL_NAMESPACE_ALIAS (newdecl)
1367 && (DECL_NAMESPACE_ALIAS (newdecl)
1368 == DECL_NAMESPACE_ALIAS (olddecl)))
1370 /* [namespace.alias]
1372 A namespace-name or namespace-alias shall not be declared as
1373 the name of any other entity in the same declarative region.
1374 A namespace-name defined at global scope shall not be
1375 declared as the name of any other entity in any global scope
1377 error ("declaration of namespace %qD conflicts with", newdecl);
1378 error ("previous declaration of namespace %q+D here", olddecl);
1379 return error_mark_node;
1383 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1386 error (errmsg, newdecl);
1387 if (DECL_NAME (olddecl) != NULL_TREE)
1388 error ((DECL_INITIAL (olddecl) && namespace_bindings_p ())
1389 ? "%q+#D previously defined here"
1390 : "%q+#D previously declared here", olddecl);
1391 return error_mark_node;
1393 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1394 && DECL_INITIAL (olddecl) != NULL_TREE
1395 && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) == NULL_TREE
1396 && TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != NULL_TREE)
1398 /* Prototype decl follows defn w/o prototype. */
1399 warning (0, "prototype for %q+#D", newdecl);
1400 warning (0, "%Jfollows non-prototype definition here", olddecl);
1402 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1403 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1405 /* extern "C" int foo ();
1406 int foo () { bar (); }
1408 if (current_lang_depth () == 0)
1409 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1412 error ("previous declaration of %q+#D with %qL linkage",
1413 olddecl, DECL_LANGUAGE (olddecl));
1414 error ("conflicts with new declaration with %qL linkage",
1415 DECL_LANGUAGE (newdecl));
1419 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1421 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1423 tree t1 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1424 tree t2 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1427 if (TREE_CODE (TREE_TYPE (newdecl)) == METHOD_TYPE)
1428 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2);
1430 for (; t1 && t1 != void_list_node;
1431 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1432 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1434 if (1 == simple_cst_equal (TREE_PURPOSE (t1),
1437 pedwarn ("default argument given for parameter %d of %q#D",
1439 pedwarn ("after previous specification in %q+#D", olddecl);
1443 error ("default argument given for parameter %d of %q#D",
1445 error ("after previous specification in %q+#D",
1450 if (DECL_DECLARED_INLINE_P (newdecl)
1451 && ! DECL_DECLARED_INLINE_P (olddecl)
1452 && TREE_ADDRESSABLE (olddecl) && warn_inline)
1454 warning (0, "%q#D was used before it was declared inline", newdecl);
1455 warning (0, "%Jprevious non-inline declaration here", olddecl);
1460 /* Do not merge an implicit typedef with an explicit one. In:
1464 typedef class A A __attribute__ ((foo));
1466 the attribute should apply only to the typedef. */
1467 if (TREE_CODE (olddecl) == TYPE_DECL
1468 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1469 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1472 /* If new decl is `static' and an `extern' was seen previously,
1474 warn_extern_redeclared_static (newdecl, olddecl);
1476 /* We have committed to returning 1 at this point. */
1477 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1479 /* Now that functions must hold information normally held
1480 by field decls, there is extra work to do so that
1481 declaration information does not get destroyed during
1483 if (DECL_VINDEX (olddecl))
1484 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1485 if (DECL_CONTEXT (olddecl))
1486 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1487 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1488 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1489 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1490 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1491 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1492 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1493 SET_OVERLOADED_OPERATOR_CODE
1494 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1495 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1497 /* Optionally warn about more than one declaration for the same
1498 name, but don't warn about a function declaration followed by a
1500 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1501 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1502 /* Don't warn about extern decl followed by definition. */
1503 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1504 /* Don't warn about friends, let add_friend take care of it. */
1505 && ! (newdecl_is_friend || DECL_FRIEND_P (olddecl)))
1507 warning (0, "redundant redeclaration of %qD in same scope", newdecl);
1508 warning (0, "previous declaration of %q+D", olddecl);
1512 /* Deal with C++: must preserve virtual function table size. */
1513 if (TREE_CODE (olddecl) == TYPE_DECL)
1515 tree newtype = TREE_TYPE (newdecl);
1516 tree oldtype = TREE_TYPE (olddecl);
1518 if (newtype != error_mark_node && oldtype != error_mark_node
1519 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1520 CLASSTYPE_FRIEND_CLASSES (newtype)
1521 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1523 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1526 /* Copy all the DECL_... slots specified in the new decl
1527 except for any that we copy here from the old type. */
1528 DECL_ATTRIBUTES (newdecl)
1529 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1531 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1535 old_result = DECL_TEMPLATE_RESULT (olddecl);
1536 new_result = DECL_TEMPLATE_RESULT (newdecl);
1537 TREE_TYPE (olddecl) = TREE_TYPE (old_result);
1538 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1539 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1540 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1542 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1544 DECL_INLINE (old_result)
1545 |= DECL_INLINE (new_result);
1546 DECL_DECLARED_INLINE_P (old_result)
1547 |= DECL_DECLARED_INLINE_P (new_result);
1548 check_redeclaration_exception_specification (newdecl, olddecl);
1551 /* If the new declaration is a definition, update the file and
1552 line information on the declaration. */
1553 if (DECL_INITIAL (old_result) == NULL_TREE
1554 && DECL_INITIAL (new_result) != NULL_TREE)
1556 DECL_SOURCE_LOCATION (olddecl)
1557 = DECL_SOURCE_LOCATION (old_result)
1558 = DECL_SOURCE_LOCATION (newdecl);
1559 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1560 DECL_ARGUMENTS (old_result)
1561 = DECL_ARGUMENTS (new_result);
1569 /* Automatically handles default parameters. */
1570 tree oldtype = TREE_TYPE (olddecl);
1573 /* Merge the data types specified in the two decls. */
1574 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1576 /* If merge_types produces a non-typedef type, just use the old type. */
1577 if (TREE_CODE (newdecl) == TYPE_DECL
1578 && newtype == DECL_ORIGINAL_TYPE (newdecl))
1581 if (TREE_CODE (newdecl) == VAR_DECL)
1583 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
1584 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
1585 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl)
1586 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl);
1587 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
1588 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
1591 /* Do this after calling `merge_types' so that default
1592 parameters don't confuse us. */
1593 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1594 check_redeclaration_exception_specification (newdecl, olddecl);
1595 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
1597 /* Lay the type out, unless already done. */
1598 if (! same_type_p (newtype, oldtype)
1599 && TREE_TYPE (newdecl) != error_mark_node
1600 && !(processing_template_decl && uses_template_parms (newdecl)))
1601 layout_type (TREE_TYPE (newdecl));
1603 if ((TREE_CODE (newdecl) == VAR_DECL
1604 || TREE_CODE (newdecl) == PARM_DECL
1605 || TREE_CODE (newdecl) == RESULT_DECL
1606 || TREE_CODE (newdecl) == FIELD_DECL
1607 || TREE_CODE (newdecl) == TYPE_DECL)
1608 && !(processing_template_decl && uses_template_parms (newdecl)))
1609 layout_decl (newdecl, 0);
1611 /* Merge the type qualifiers. */
1612 if (TREE_READONLY (newdecl))
1613 TREE_READONLY (olddecl) = 1;
1614 if (TREE_THIS_VOLATILE (newdecl))
1615 TREE_THIS_VOLATILE (olddecl) = 1;
1616 if (TREE_NOTHROW (newdecl))
1617 TREE_NOTHROW (olddecl) = 1;
1619 /* Merge deprecatedness. */
1620 if (TREE_DEPRECATED (newdecl))
1621 TREE_DEPRECATED (olddecl) = 1;
1623 /* Merge the initialization information. */
1624 if (DECL_INITIAL (newdecl) == NULL_TREE
1625 && DECL_INITIAL (olddecl) != NULL_TREE)
1627 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1628 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1629 if (CAN_HAVE_FULL_LANG_DECL_P (newdecl)
1630 && DECL_LANG_SPECIFIC (newdecl)
1631 && DECL_LANG_SPECIFIC (olddecl))
1633 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1634 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1638 /* Merge the section attribute.
1639 We want to issue an error if the sections conflict but that must be
1640 done later in decl_attributes since we are called before attributes
1642 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1643 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1645 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1647 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1648 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1649 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1650 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1651 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1652 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
1653 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1654 DECL_IS_PURE (newdecl) |= DECL_IS_PURE (olddecl);
1655 /* Keep the old RTL. */
1656 COPY_DECL_RTL (olddecl, newdecl);
1658 else if (TREE_CODE (newdecl) == VAR_DECL
1659 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
1661 /* Keep the old RTL. We cannot keep the old RTL if the old
1662 declaration was for an incomplete object and the new
1663 declaration is not since many attributes of the RTL will
1665 COPY_DECL_RTL (olddecl, newdecl);
1668 /* If cannot merge, then use the new type and qualifiers,
1669 and don't preserve the old rtl. */
1672 /* Clean out any memory we had of the old declaration. */
1673 tree oldstatic = value_member (olddecl, static_aggregates);
1675 TREE_VALUE (oldstatic) = error_mark_node;
1677 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1678 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1679 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1680 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1683 /* Merge the storage class information. */
1684 merge_weak (newdecl, olddecl);
1686 DECL_ONE_ONLY (newdecl) |= DECL_ONE_ONLY (olddecl);
1687 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
1688 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1689 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
1690 if (! DECL_EXTERNAL (olddecl))
1691 DECL_EXTERNAL (newdecl) = 0;
1693 new_template = NULL_TREE;
1694 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
1696 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
1697 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
1698 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
1699 DECL_TEMPLATE_INSTANTIATED (newdecl)
1700 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
1702 /* If the OLDDECL is an instantiation and/or specialization,
1703 then the NEWDECL must be too. But, it may not yet be marked
1704 as such if the caller has created NEWDECL, but has not yet
1705 figured out that it is a redeclaration. */
1706 if (!DECL_USE_TEMPLATE (newdecl))
1707 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
1709 /* Don't really know how much of the language-specific
1710 values we should copy from old to new. */
1711 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
1712 DECL_LANG_SPECIFIC (newdecl)->decl_flags.u2 =
1713 DECL_LANG_SPECIFIC (olddecl)->decl_flags.u2;
1714 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
1715 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
1716 if (DECL_TEMPLATE_INFO (newdecl))
1717 new_template = DECL_TI_TEMPLATE (newdecl);
1718 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
1719 DECL_INITIALIZED_IN_CLASS_P (newdecl)
1720 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
1721 olddecl_friend = DECL_FRIEND_P (olddecl);
1722 hidden_friend = (DECL_ANTICIPATED (olddecl)
1723 && DECL_HIDDEN_FRIEND_P (olddecl)
1724 && newdecl_is_friend);
1726 /* Only functions have DECL_BEFRIENDING_CLASSES. */
1727 if (TREE_CODE (newdecl) == FUNCTION_DECL
1728 || DECL_FUNCTION_TEMPLATE_P (newdecl))
1730 DECL_BEFRIENDING_CLASSES (newdecl)
1731 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
1732 DECL_BEFRIENDING_CLASSES (olddecl));
1733 /* DECL_THUNKS is only valid for virtual functions,
1734 otherwise it is a DECL_FRIEND_CONTEXT. */
1735 if (DECL_VIRTUAL_P (newdecl))
1736 DECL_THUNKS (newdecl) = DECL_THUNKS (olddecl);
1740 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1742 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
1743 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
1745 /* If newdecl is not a specialization, then it is not a
1746 template-related function at all. And that means that we
1747 should have exited above, returning 0. */
1748 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
1750 if (TREE_USED (olddecl))
1751 /* From [temp.expl.spec]:
1753 If a template, a member template or the member of a class
1754 template is explicitly specialized then that
1755 specialization shall be declared before the first use of
1756 that specialization that would cause an implicit
1757 instantiation to take place, in every translation unit in
1758 which such a use occurs. */
1759 error ("explicit specialization of %qD after first use",
1762 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
1764 /* [temp.expl.spec/14] We don't inline explicit specialization
1765 just because the primary template says so. */
1769 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
1770 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
1772 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
1774 /* If either decl says `inline', this fn is inline, unless
1775 its definition was passed already. */
1776 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == NULL_TREE)
1777 DECL_INLINE (olddecl) = 1;
1778 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1780 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1781 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1784 /* Preserve abstractness on cloned [cd]tors. */
1785 DECL_ABSTRACT (newdecl) = DECL_ABSTRACT (olddecl);
1789 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1790 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
1791 COPY_DECL_RTL (newdecl, olddecl);
1793 if (! types_match || new_defines_function)
1795 /* These need to be copied so that the names are available.
1796 Note that if the types do match, we'll preserve inline
1797 info and other bits, but if not, we won't. */
1798 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
1799 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
1801 if (new_defines_function)
1802 /* If defining a function declared with other language
1803 linkage, use the previously declared language linkage. */
1804 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1805 else if (types_match)
1807 /* If redeclaring a builtin function, and not a definition,
1808 it stays built in. */
1809 if (DECL_BUILT_IN (olddecl))
1811 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1812 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1813 /* If we're keeping the built-in definition, keep the rtl,
1814 regardless of declaration matches. */
1815 COPY_DECL_RTL (olddecl, newdecl);
1818 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1819 /* Don't clear out the arguments if we're redefining a function. */
1820 if (DECL_ARGUMENTS (olddecl))
1821 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1824 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1825 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
1827 /* Now preserve various other info from the definition. */
1828 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
1829 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
1830 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
1831 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1833 /* Warn about conflicting visibility specifications. */
1834 if (DECL_VISIBILITY_SPECIFIED (olddecl)
1835 && DECL_VISIBILITY_SPECIFIED (newdecl)
1836 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
1838 warning (OPT_Wattributes, "%q+D: visibility attribute ignored "
1839 "because it", newdecl);
1840 warning (OPT_Wattributes, "%Jconflicts with previous "
1841 "declaration here", olddecl);
1843 /* Choose the declaration which specified visibility. */
1844 if (DECL_VISIBILITY_SPECIFIED (olddecl))
1846 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
1847 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
1849 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
1850 so keep this behavior. */
1851 if (TREE_CODE (newdecl) == VAR_DECL && DECL_HAS_INIT_PRIORITY_P (newdecl))
1853 SET_DECL_INIT_PRIORITY (olddecl, DECL_INIT_PRIORITY (newdecl));
1854 DECL_HAS_INIT_PRIORITY_P (olddecl) = 1;
1857 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
1858 with that from NEWDECL below. */
1859 if (DECL_LANG_SPECIFIC (olddecl))
1861 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
1862 != DECL_LANG_SPECIFIC (newdecl));
1863 ggc_free (DECL_LANG_SPECIFIC (olddecl));
1866 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1870 function_size = sizeof (struct tree_decl_common);
1872 memcpy ((char *) olddecl + sizeof (struct tree_common),
1873 (char *) newdecl + sizeof (struct tree_common),
1874 function_size - sizeof (struct tree_common));
1876 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
1877 (char *) newdecl + sizeof (struct tree_decl_common),
1878 sizeof (struct tree_function_decl) - sizeof (struct tree_decl_common));
1880 /* If newdecl is a template instantiation, it is possible that
1881 the following sequence of events has occurred:
1883 o A friend function was declared in a class template. The
1884 class template was instantiated.
1886 o The instantiation of the friend declaration was
1887 recorded on the instantiation list, and is newdecl.
1889 o Later, however, instantiate_class_template called pushdecl
1890 on the newdecl to perform name injection. But, pushdecl in
1891 turn called duplicate_decls when it discovered that another
1892 declaration of a global function with the same name already
1895 o Here, in duplicate_decls, we decided to clobber newdecl.
1897 If we're going to do that, we'd better make sure that
1898 olddecl, and not newdecl, is on the list of
1899 instantiations so that if we try to do the instantiation
1900 again we won't get the clobbered declaration. */
1901 reregister_specialization (newdecl,
1907 size_t size = tree_code_size (TREE_CODE (olddecl));
1908 memcpy ((char *) olddecl + sizeof (struct tree_common),
1909 (char *) newdecl + sizeof (struct tree_common),
1910 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
1911 switch (TREE_CODE (olddecl))
1921 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
1922 (char *) newdecl + sizeof (struct tree_decl_common),
1923 size - sizeof (struct tree_decl_common)
1924 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
1928 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
1929 (char *) newdecl + sizeof (struct tree_decl_common),
1930 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)
1931 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
1935 DECL_UID (olddecl) = olddecl_uid;
1937 DECL_FRIEND_P (olddecl) = 1;
1940 DECL_ANTICIPATED (olddecl) = 1;
1941 DECL_HIDDEN_FRIEND_P (olddecl) = 1;
1944 /* NEWDECL contains the merged attribute lists.
1945 Update OLDDECL to be the same. */
1946 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
1948 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
1949 so that encode_section_info has a chance to look at the new decl
1950 flags and attributes. */
1951 if (DECL_RTL_SET_P (olddecl)
1952 && (TREE_CODE (olddecl) == FUNCTION_DECL
1953 || (TREE_CODE (olddecl) == VAR_DECL
1954 && TREE_STATIC (olddecl))))
1955 make_decl_rtl (olddecl);
1957 /* The NEWDECL will no longer be needed. Because every out-of-class
1958 declaration of a member results in a call to duplicate_decls,
1959 freeing these nodes represents in a significant savings. */
1965 /* Return zero if the declaration NEWDECL is valid
1966 when the declaration OLDDECL (assumed to be for the same name)
1967 has already been seen.
1968 Otherwise return an error message format string with a %s
1969 where the identifier should go. */
1972 redeclaration_error_message (tree newdecl, tree olddecl)
1974 if (TREE_CODE (newdecl) == TYPE_DECL)
1976 /* Because C++ can put things into name space for free,
1977 constructs like "typedef struct foo { ... } foo"
1978 would look like an erroneous redeclaration. */
1979 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
1982 return "redefinition of %q#D";
1984 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1986 /* If this is a pure function, its olddecl will actually be
1987 the original initialization to `0' (which we force to call
1988 abort()). Don't complain about redefinition in this case. */
1989 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
1990 && DECL_INITIAL (olddecl) == NULL_TREE)
1993 /* If both functions come from different namespaces, this is not
1994 a redeclaration - this is a conflict with a used function. */
1995 if (DECL_NAMESPACE_SCOPE_P (olddecl)
1996 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
1997 && ! decls_match (olddecl, newdecl))
1998 return "%qD conflicts with used function";
2000 /* We'll complain about linkage mismatches in
2001 warn_extern_redeclared_static. */
2003 /* Defining the same name twice is no good. */
2004 if (DECL_INITIAL (olddecl) != NULL_TREE
2005 && DECL_INITIAL (newdecl) != NULL_TREE)
2007 if (DECL_NAME (olddecl) == NULL_TREE)
2008 return "%q#D not declared in class";
2010 return "redefinition of %q#D";
2014 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
2018 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
2020 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
2021 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
2022 return "redefinition of %q#D";
2026 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
2027 || (DECL_TEMPLATE_RESULT (newdecl)
2028 == DECL_TEMPLATE_RESULT (olddecl)))
2031 nt = DECL_TEMPLATE_RESULT (newdecl);
2032 if (DECL_TEMPLATE_INFO (nt))
2033 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
2034 ot = DECL_TEMPLATE_RESULT (olddecl);
2035 if (DECL_TEMPLATE_INFO (ot))
2036 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
2037 if (DECL_INITIAL (nt) && DECL_INITIAL (ot))
2038 return "redefinition of %q#D";
2042 else if (TREE_CODE (newdecl) == VAR_DECL
2043 && DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl))
2045 /* Only variables can be thread-local, and all declarations must
2046 agree on this property. */
2047 if (DECL_THREAD_LOCAL_P (newdecl))
2048 return "thread-local declaration of %q#D follows "
2049 "non-thread-local declaration";
2051 return "non-thread-local declaration of %q#D follows "
2052 "thread-local declaration";
2054 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2056 /* Objects declared at top level: */
2057 /* If at least one is a reference, it's ok. */
2058 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2060 /* Reject two definitions. */
2061 return "redefinition of %q#D";
2065 /* Objects declared with block scope: */
2066 /* Reject two definitions, and reject a definition
2067 together with an external reference. */
2068 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2069 return "redeclaration of %q#D";
2074 /* Create a new label, named ID. */
2077 make_label_decl (tree id, int local_p)
2081 decl = build_decl (LABEL_DECL, id, void_type_node);
2083 DECL_CONTEXT (decl) = current_function_decl;
2084 DECL_MODE (decl) = VOIDmode;
2085 C_DECLARED_LABEL_FLAG (decl) = local_p;
2087 /* Say where one reference is to the label, for the sake of the
2088 error if it is not defined. */
2089 DECL_SOURCE_LOCATION (decl) = input_location;
2091 /* Record the fact that this identifier is bound to this label. */
2092 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2097 /* Record this label on the list of used labels so that we can check
2098 at the end of the function to see whether or not the label was
2099 actually defined, and so we can check when the label is defined whether
2100 this use is valid. */
2103 use_label (tree decl)
2105 if (named_label_uses == NULL
2106 || named_label_uses->names_in_scope != current_binding_level->names
2107 || named_label_uses->label_decl != decl)
2109 struct named_label_use_list *new_ent;
2110 new_ent = GGC_NEW (struct named_label_use_list);
2111 new_ent->label_decl = decl;
2112 new_ent->names_in_scope = current_binding_level->names;
2113 new_ent->binding_level = current_binding_level;
2114 new_ent->o_goto_locus = input_location;
2115 new_ent->next = named_label_uses;
2116 named_label_uses = new_ent;
2120 /* Look for a label named ID in the current function. If one cannot
2121 be found, create one. (We keep track of used, but undefined,
2122 labels, and complain about them at the end of a function.) */
2125 lookup_label (tree id)
2128 struct named_label_list *ent;
2130 timevar_push (TV_NAME_LOOKUP);
2131 /* You can't use labels at global scope. */
2132 if (current_function_decl == NULL_TREE)
2134 error ("label %qE referenced outside of any function", id);
2135 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, NULL_TREE);
2138 /* See if we've already got this label. */
2139 decl = IDENTIFIER_LABEL_VALUE (id);
2140 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2141 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2143 /* Record this label on the list of labels used in this function.
2144 We do this before calling make_label_decl so that we get the
2145 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2146 ent = GGC_CNEW (struct named_label_list);
2147 ent->old_value = IDENTIFIER_LABEL_VALUE (id);
2148 ent->next = named_labels;
2151 /* We need a new label. */
2152 decl = make_label_decl (id, /*local_p=*/0);
2154 /* Now fill in the information we didn't have before. */
2155 ent->label_decl = decl;
2157 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2160 /* Declare a local label named ID. */
2163 declare_local_label (tree id)
2167 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2168 this scope we can restore the old value of
2169 IDENTIFIER_TYPE_VALUE. */
2170 current_binding_level->shadowed_labels
2171 = tree_cons (IDENTIFIER_LABEL_VALUE (id), NULL_TREE,
2172 current_binding_level->shadowed_labels);
2173 /* Look for the label. */
2174 decl = make_label_decl (id, /*local_p=*/1);
2175 /* Now fill in the information we didn't have before. */
2176 TREE_VALUE (current_binding_level->shadowed_labels) = decl;
2181 /* Returns nonzero if it is ill-formed to jump past the declaration of
2182 DECL. Returns 2 if it's also a real problem. */
2185 decl_jump_unsafe (tree decl)
2187 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl)
2188 || TREE_TYPE (decl) == error_mark_node)
2191 if (TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))
2192 || DECL_NONTRIVIALLY_INITIALIZED_P (decl))
2195 if (pod_type_p (TREE_TYPE (decl)))
2198 /* The POD stuff is just pedantry; why should it matter if the class
2199 contains a field of pointer to member type? */
2203 /* Check that a single previously seen jump to a newly defined label
2204 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2205 the jump context; NAMES are the names in scope in LEVEL at the jump
2206 context; FILE and LINE are the source position of the jump or 0. */
2209 check_previous_goto_1 (tree decl,
2210 struct cp_binding_level* level,
2211 tree names, const location_t *locus)
2215 struct cp_binding_level *b = current_binding_level;
2216 for (; b; b = b->level_chain)
2218 tree new_decls = b->names;
2219 tree old_decls = (b == level ? names : NULL_TREE);
2220 for (; new_decls != old_decls;
2221 new_decls = TREE_CHAIN (new_decls))
2223 int problem = decl_jump_unsafe (new_decls);
2230 pedwarn ("jump to label %qD", decl);
2232 pedwarn ("jump to case label");
2235 pedwarn ("%H from here", locus);
2240 error (" crosses initialization of %q+#D", new_decls);
2242 pedwarn (" enters scope of non-POD %q+#D", new_decls);
2247 if ((b->kind == sk_try || b->kind == sk_catch) && ! saw_eh)
2252 pedwarn ("jump to label %qD", decl);
2254 pedwarn ("jump to case label");
2257 pedwarn ("%H from here", locus);
2260 if (b->kind == sk_try)
2261 error (" enters try block");
2263 error (" enters catch block");
2270 check_previous_goto (struct named_label_use_list* use)
2272 check_previous_goto_1 (use->label_decl, use->binding_level,
2273 use->names_in_scope, &use->o_goto_locus);
2277 check_switch_goto (struct cp_binding_level* level)
2279 check_previous_goto_1 (NULL_TREE, level, level->names, NULL);
2282 /* Check that any previously seen jumps to a newly defined label DECL
2283 are OK. Called by define_label. */
2286 check_previous_gotos (tree decl)
2288 struct named_label_use_list **usep;
2290 if (! TREE_USED (decl))
2293 for (usep = &named_label_uses; *usep; )
2295 struct named_label_use_list *use = *usep;
2296 if (use->label_decl == decl)
2298 check_previous_goto (use);
2302 usep = &(use->next);
2306 /* Check that a new jump to a label DECL is OK. Called by
2307 finish_goto_stmt. */
2310 check_goto (tree decl)
2314 struct named_label_list *lab;
2316 /* We can't know where a computed goto is jumping. So we assume
2318 if (! DECL_P (decl))
2321 /* If the label hasn't been defined yet, defer checking. */
2322 if (! DECL_INITIAL (decl))
2328 for (lab = named_labels; lab; lab = lab->next)
2329 if (decl == lab->label_decl)
2332 /* If the label is not on named_labels it's a gcc local label, so
2333 it must be in an outer scope, so jumping to it is always OK. */
2337 if ((lab->in_try_scope || lab->in_catch_scope || lab->bad_decls)
2340 pedwarn ("jump to label %q+D", decl);
2341 pedwarn (" from here");
2345 for (bad = lab->bad_decls; bad; bad = TREE_CHAIN (bad))
2347 tree b = TREE_VALUE (bad);
2348 int u = decl_jump_unsafe (b);
2350 if (u > 1 && DECL_ARTIFICIAL (b))
2351 /* Can't skip init of __exception_info. */
2352 error ("%J enters catch block", b);
2354 error (" skips initialization of %q+#D", b);
2356 pedwarn (" enters scope of non-POD %q+#D", b);
2359 if (lab->in_try_scope)
2360 error (" enters try block");
2361 else if (lab->in_catch_scope)
2362 error (" enters catch block");
2365 /* Define a label, specifying the location in the source file.
2366 Return the LABEL_DECL node for the label. */
2369 define_label (location_t location, tree name)
2371 tree decl = lookup_label (name);
2372 struct named_label_list *ent;
2373 struct cp_binding_level *p;
2375 timevar_push (TV_NAME_LOOKUP);
2376 for (ent = named_labels; ent; ent = ent->next)
2377 if (ent->label_decl == decl)
2380 /* After labels, make any new cleanups in the function go into their
2381 own new (temporary) binding contour. */
2382 for (p = current_binding_level;
2383 p->kind != sk_function_parms;
2385 p->more_cleanups_ok = 0;
2387 if (name == get_identifier ("wchar_t"))
2388 pedwarn ("label named wchar_t");
2390 if (DECL_INITIAL (decl) != NULL_TREE)
2391 error ("duplicate label %qD", decl);
2394 /* Mark label as having been defined. */
2395 DECL_INITIAL (decl) = error_mark_node;
2396 /* Say where in the source. */
2397 DECL_SOURCE_LOCATION (decl) = location;
2400 ent->names_in_scope = current_binding_level->names;
2401 ent->binding_level = current_binding_level;
2403 check_previous_gotos (decl);
2406 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2411 struct cp_binding_level *level;
2412 struct cp_switch *next;
2413 /* The SWITCH_STMT being built. */
2415 /* A splay-tree mapping the low element of a case range to the high
2416 element, or NULL_TREE if there is no high element. Used to
2417 determine whether or not a new case label duplicates an old case
2418 label. We need a tree, rather than simply a hash table, because
2419 of the GNU case range extension. */
2423 /* A stack of the currently active switch statements. The innermost
2424 switch statement is on the top of the stack. There is no need to
2425 mark the stack for garbage collection because it is only active
2426 during the processing of the body of a function, and we never
2427 collect at that point. */
2429 static struct cp_switch *switch_stack;
2431 /* Called right after a switch-statement condition is parsed.
2432 SWITCH_STMT is the switch statement being parsed. */
2435 push_switch (tree switch_stmt)
2437 struct cp_switch *p = XNEW (struct cp_switch);
2438 p->level = current_binding_level;
2439 p->next = switch_stack;
2440 p->switch_stmt = switch_stmt;
2441 p->cases = splay_tree_new (case_compare, NULL, NULL);
2448 struct cp_switch *cs = switch_stack;
2449 location_t switch_location;
2451 /* Emit warnings as needed. */
2452 if (EXPR_HAS_LOCATION (cs->switch_stmt))
2453 switch_location = EXPR_LOCATION (cs->switch_stmt);
2455 switch_location = input_location;
2456 if (!processing_template_decl)
2457 c_do_switch_warnings (cs->cases, switch_location,
2458 SWITCH_STMT_TYPE (cs->switch_stmt),
2459 SWITCH_STMT_COND (cs->switch_stmt));
2461 splay_tree_delete (cs->cases);
2462 switch_stack = switch_stack->next;
2466 /* Note that we've seen a definition of a case label, and complain if this
2467 is a bad place for one. */
2470 finish_case_label (tree low_value, tree high_value)
2473 struct cp_binding_level *p;
2475 if (processing_template_decl)
2479 /* For templates, just add the case label; we'll do semantic
2480 analysis at instantiation-time. */
2481 label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
2482 return add_stmt (build_case_label (low_value, high_value, label));
2485 /* Find the condition on which this switch statement depends. */
2486 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
2487 if (cond && TREE_CODE (cond) == TREE_LIST)
2488 cond = TREE_VALUE (cond);
2490 r = c_add_case_label (switch_stack->cases, cond, TREE_TYPE (cond),
2491 low_value, high_value);
2493 check_switch_goto (switch_stack->level);
2495 /* After labels, make any new cleanups in the function go into their
2496 own new (temporary) binding contour. */
2497 for (p = current_binding_level;
2498 p->kind != sk_function_parms;
2500 p->more_cleanups_ok = 0;
2505 /* Hash a TYPENAME_TYPE. K is really of type `tree'. */
2508 typename_hash (const void* k)
2513 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
2514 ^ htab_hash_pointer (DECL_NAME (TYPE_NAME (t))));
2519 typedef struct typename_info {
2527 /* Compare two TYPENAME_TYPEs. K1 and K2 are really of type `tree'. */
2530 typename_compare (const void * k1, const void * k2)
2533 const typename_info *t2;
2536 t2 = (const typename_info *) k2;
2538 return (DECL_NAME (TYPE_NAME (t1)) == t2->name
2539 && TYPE_CONTEXT (t1) == t2->scope
2540 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
2541 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
2542 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
2545 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
2546 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
2548 Returns the new TYPENAME_TYPE. */
2550 static GTY ((param_is (union tree_node))) htab_t typename_htab;
2553 build_typename_type (tree context, tree name, tree fullname,
2554 enum tag_types tag_type)
2562 if (typename_htab == NULL)
2563 typename_htab = htab_create_ggc (61, &typename_hash,
2564 &typename_compare, NULL);
2566 ti.scope = FROB_CONTEXT (context);
2568 ti.template_id = fullname;
2569 ti.enum_p = tag_type == enum_type;
2570 ti.class_p = (tag_type == class_type
2571 || tag_type == record_type
2572 || tag_type == union_type);
2573 hash = (htab_hash_pointer (ti.scope)
2574 ^ htab_hash_pointer (ti.name));
2576 /* See if we already have this type. */
2577 e = htab_find_slot_with_hash (typename_htab, &ti, hash, INSERT);
2582 /* Build the TYPENAME_TYPE. */
2583 t = make_aggr_type (TYPENAME_TYPE);
2584 TYPE_CONTEXT (t) = ti.scope;
2585 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
2586 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
2587 TYPENAME_IS_CLASS_P (t) = ti.class_p;
2589 /* Build the corresponding TYPE_DECL. */
2590 d = build_decl (TYPE_DECL, name, t);
2591 TYPE_NAME (TREE_TYPE (d)) = d;
2592 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
2593 DECL_CONTEXT (d) = FROB_CONTEXT (context);
2594 DECL_ARTIFICIAL (d) = 1;
2596 /* Store it in the hash table. */
2603 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
2604 provided to name the type. Returns an appropriate type, unless an
2605 error occurs, in which case error_mark_node is returned. If we
2606 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
2607 return that, rather than the _TYPE it corresponds to, in other
2608 cases we look through the type decl. If TF_ERROR is set, complain
2609 about errors, otherwise be quiet. */
2612 make_typename_type (tree context, tree name, enum tag_types tag_type,
2613 tsubst_flags_t complain)
2617 if (name == error_mark_node
2618 || context == NULL_TREE
2619 || context == error_mark_node)
2620 return error_mark_node;
2624 if (!(TYPE_LANG_SPECIFIC (name)
2625 && (CLASSTYPE_IS_TEMPLATE (name)
2626 || CLASSTYPE_USE_TEMPLATE (name))))
2627 name = TYPE_IDENTIFIER (name);
2629 /* Create a TEMPLATE_ID_EXPR for the type. */
2630 name = build_nt (TEMPLATE_ID_EXPR,
2631 CLASSTYPE_TI_TEMPLATE (name),
2632 CLASSTYPE_TI_ARGS (name));
2634 else if (TREE_CODE (name) == TYPE_DECL)
2635 name = DECL_NAME (name);
2639 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
2641 name = TREE_OPERAND (name, 0);
2642 if (TREE_CODE (name) == TEMPLATE_DECL)
2643 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
2645 if (TREE_CODE (name) == TEMPLATE_DECL)
2647 error ("%qD used without template parameters", name);
2648 return error_mark_node;
2650 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
2651 gcc_assert (TYPE_P (context));
2653 if (!dependent_type_p (context)
2654 || currently_open_class (context))
2656 if (TREE_CODE (fullname) == TEMPLATE_ID_EXPR)
2658 tree tmpl = NULL_TREE;
2659 if (IS_AGGR_TYPE (context))
2660 tmpl = lookup_field (context, name, 0, false);
2661 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
2663 if (complain & tf_error)
2664 error ("no class template named %q#T in %q#T",
2666 return error_mark_node;
2669 if (complain & tf_error)
2670 perform_or_defer_access_check (TYPE_BINFO (context), tmpl);
2672 return lookup_template_class (tmpl,
2673 TREE_OPERAND (fullname, 1),
2675 /*entering_scope=*/0,
2676 tf_error | tf_warning | tf_user);
2682 if (!IS_AGGR_TYPE (context))
2684 if (complain & tf_error)
2685 error ("no type named %q#T in %q#T", name, context);
2686 return error_mark_node;
2689 t = lookup_field (context, name, 0, true);
2692 if (TREE_CODE (t) != TYPE_DECL)
2694 if (complain & tf_error)
2695 error ("no type named %q#T in %q#T", name, context);
2696 return error_mark_node;
2699 if (complain & tf_error)
2700 perform_or_defer_access_check (TYPE_BINFO (context), t);
2702 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
2710 /* If the CONTEXT is not a template type, then either the field is
2711 there now or its never going to be. */
2712 if (!dependent_type_p (context))
2714 if (complain & tf_error)
2715 error ("no type named %q#T in %q#T", name, context);
2716 return error_mark_node;
2719 return build_typename_type (context, name, fullname, tag_type);
2722 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
2723 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
2724 in which case error_mark_node is returned.
2726 If PARM_LIST is non-NULL, also make sure that the template parameter
2727 list of TEMPLATE_DECL matches.
2729 If COMPLAIN zero, don't complain about any errors that occur. */
2732 make_unbound_class_template (tree context, tree name, tree parm_list,
2733 tsubst_flags_t complain)
2739 name = TYPE_IDENTIFIER (name);
2740 else if (DECL_P (name))
2741 name = DECL_NAME (name);
2742 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
2744 if (!dependent_type_p (context)
2745 || currently_open_class (context))
2747 tree tmpl = NULL_TREE;
2749 if (IS_AGGR_TYPE (context))
2750 tmpl = lookup_field (context, name, 0, false);
2752 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
2754 if (complain & tf_error)
2755 error ("no class template named %q#T in %q#T", name, context);
2756 return error_mark_node;
2760 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
2762 if (complain & tf_error)
2764 error ("template parameters do not match template");
2765 error ("%q+D declared here", tmpl);
2767 return error_mark_node;
2770 if (complain & tf_error)
2771 perform_or_defer_access_check (TYPE_BINFO (context), tmpl);
2776 /* Build the UNBOUND_CLASS_TEMPLATE. */
2777 t = make_aggr_type (UNBOUND_CLASS_TEMPLATE);
2778 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
2779 TREE_TYPE (t) = NULL_TREE;
2781 /* Build the corresponding TEMPLATE_DECL. */
2782 d = build_decl (TEMPLATE_DECL, name, t);
2783 TYPE_NAME (TREE_TYPE (d)) = d;
2784 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
2785 DECL_CONTEXT (d) = FROB_CONTEXT (context);
2786 DECL_ARTIFICIAL (d) = 1;
2787 DECL_TEMPLATE_PARMS (d) = parm_list;
2794 /* Push the declarations of builtin types into the namespace.
2795 RID_INDEX is the index of the builtin type in the array
2796 RID_POINTERS. NAME is the name used when looking up the builtin
2797 type. TYPE is the _TYPE node for the builtin type. */
2800 record_builtin_type (enum rid rid_index,
2804 tree rname = NULL_TREE, tname = NULL_TREE;
2805 tree tdecl = NULL_TREE;
2807 if ((int) rid_index < (int) RID_MAX)
2808 rname = ridpointers[(int) rid_index];
2810 tname = get_identifier (name);
2812 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
2813 eliminated. Built-in types should not be looked up name; their
2814 names are keywords that the parser can recognize. However, there
2815 is code in c-common.c that uses identifier_global_value to look
2816 up built-in types by name. */
2819 tdecl = build_decl (TYPE_DECL, tname, type);
2820 DECL_ARTIFICIAL (tdecl) = 1;
2821 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
2827 tdecl = build_decl (TYPE_DECL, rname, type);
2828 DECL_ARTIFICIAL (tdecl) = 1;
2830 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
2833 if (!TYPE_NAME (type))
2834 TYPE_NAME (type) = tdecl;
2837 debug_hooks->type_decl (tdecl, 0);
2840 /* Record one of the standard Java types.
2841 * Declare it as having the given NAME.
2842 * If SIZE > 0, it is the size of one of the integral types;
2843 * otherwise it is the negative of the size of one of the other types. */
2846 record_builtin_java_type (const char* name, int size)
2850 type = make_signed_type (size);
2851 else if (size > -32)
2852 { /* "__java_char" or ""__java_boolean". */
2853 type = make_unsigned_type (-size);
2854 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
2857 { /* "__java_float" or ""__java_double". */
2858 type = make_node (REAL_TYPE);
2859 TYPE_PRECISION (type) = - size;
2862 record_builtin_type (RID_MAX, name, type);
2863 decl = TYPE_NAME (type);
2865 /* Suppress generate debug symbol entries for these types,
2866 since for normal C++ they are just clutter.
2867 However, push_lang_context undoes this if extern "Java" is seen. */
2868 DECL_IGNORED_P (decl) = 1;
2870 TYPE_FOR_JAVA (type) = 1;
2874 /* Push a type into the namespace so that the back-ends ignore it. */
2877 record_unknown_type (tree type, const char* name)
2879 tree decl = pushdecl (build_decl (TYPE_DECL, get_identifier (name), type));
2880 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
2881 DECL_IGNORED_P (decl) = 1;
2882 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
2883 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
2884 TYPE_ALIGN (type) = 1;
2885 TYPE_USER_ALIGN (type) = 0;
2886 TYPE_MODE (type) = TYPE_MODE (void_type_node);
2889 /* A string for which we should create an IDENTIFIER_NODE at
2892 typedef struct predefined_identifier
2894 /* The name of the identifier. */
2895 const char *const name;
2896 /* The place where the IDENTIFIER_NODE should be stored. */
2898 /* Nonzero if this is the name of a constructor or destructor. */
2899 const int ctor_or_dtor_p;
2900 } predefined_identifier;
2902 /* Create all the predefined identifiers. */
2905 initialize_predefined_identifiers (void)
2907 const predefined_identifier *pid;
2909 /* A table of identifiers to create at startup. */
2910 static const predefined_identifier predefined_identifiers[] = {
2911 { "C++", &lang_name_cplusplus, 0 },
2912 { "C", &lang_name_c, 0 },
2913 { "Java", &lang_name_java, 0 },
2914 /* Some of these names have a trailing space so that it is
2915 impossible for them to conflict with names written by users. */
2916 { "__ct ", &ctor_identifier, 1 },
2917 { "__base_ctor ", &base_ctor_identifier, 1 },
2918 { "__comp_ctor ", &complete_ctor_identifier, 1 },
2919 { "__dt ", &dtor_identifier, 1 },
2920 { "__comp_dtor ", &complete_dtor_identifier, 1 },
2921 { "__base_dtor ", &base_dtor_identifier, 1 },
2922 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
2923 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
2924 { "nelts", &nelts_identifier, 0 },
2925 { THIS_NAME, &this_identifier, 0 },
2926 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
2927 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
2928 { "_vptr", &vptr_identifier, 0 },
2929 { "__vtt_parm", &vtt_parm_identifier, 0 },
2930 { "::", &global_scope_name, 0 },
2931 { "std", &std_identifier, 0 },
2935 for (pid = predefined_identifiers; pid->name; ++pid)
2937 *pid->node = get_identifier (pid->name);
2938 if (pid->ctor_or_dtor_p)
2939 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
2943 /* Create the predefined scalar types of C,
2944 and some nodes representing standard constants (0, 1, (void *)0).
2945 Initialize the global binding level.
2946 Make definitions for built-in primitive functions. */
2949 cxx_init_decl_processing (void)
2952 tree void_ftype_ptr;
2954 build_common_tree_nodes (flag_signed_char, false);
2956 /* Create all the identifiers we need. */
2957 initialize_predefined_identifiers ();
2959 /* Create the global variables. */
2960 push_to_top_level ();
2962 current_function_decl = NULL_TREE;
2963 current_binding_level = NULL;
2964 /* Enter the global namespace. */
2965 gcc_assert (global_namespace == NULL_TREE);
2966 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
2968 begin_scope (sk_namespace, global_namespace);
2970 current_lang_name = NULL_TREE;
2972 /* Adjust various flags based on command-line settings. */
2973 if (!flag_permissive)
2974 flag_pedantic_errors = 1;
2975 if (!flag_no_inline)
2977 flag_inline_trees = 1;
2980 if (flag_inline_functions)
2981 flag_inline_trees = 2;
2983 /* Force minimum function alignment if using the least significant
2984 bit of function pointers to store the virtual bit. */
2985 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
2986 && force_align_functions_log < 1)
2987 force_align_functions_log = 1;
2990 current_lang_name = lang_name_c;
2992 error_mark_list = build_tree_list (error_mark_node, error_mark_node);
2993 TREE_TYPE (error_mark_list) = error_mark_node;
2995 /* Create the `std' namespace. */
2996 push_namespace (std_identifier);
2997 std_node = current_namespace;
3000 c_common_nodes_and_builtins ();
3002 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
3003 java_short_type_node = record_builtin_java_type ("__java_short", 16);
3004 java_int_type_node = record_builtin_java_type ("__java_int", 32);
3005 java_long_type_node = record_builtin_java_type ("__java_long", 64);
3006 java_float_type_node = record_builtin_java_type ("__java_float", -32);
3007 java_double_type_node = record_builtin_java_type ("__java_double", -64);
3008 java_char_type_node = record_builtin_java_type ("__java_char", -16);
3009 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
3011 integer_two_node = build_int_cst (NULL_TREE, 2);
3012 integer_three_node = build_int_cst (NULL_TREE, 3);
3014 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
3015 truthvalue_type_node = boolean_type_node;
3016 truthvalue_false_node = boolean_false_node;
3017 truthvalue_true_node = boolean_true_node;
3019 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
3022 record_builtin_type (RID_MAX, NULL, string_type_node);
3025 delta_type_node = ptrdiff_type_node;
3026 vtable_index_type = ptrdiff_type_node;
3028 vtt_parm_type = build_pointer_type (const_ptr_type_node);
3029 void_ftype = build_function_type (void_type_node, void_list_node);
3030 void_ftype_ptr = build_function_type (void_type_node,
3031 tree_cons (NULL_TREE,
3035 = build_exception_variant (void_ftype_ptr, empty_except_spec);
3037 /* C++ extensions */
3039 unknown_type_node = make_node (UNKNOWN_TYPE);
3040 record_unknown_type (unknown_type_node, "unknown type");
3042 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3043 TREE_TYPE (unknown_type_node) = unknown_type_node;
3045 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3047 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
3048 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
3051 /* Make sure we get a unique function type, so we can give
3052 its pointer type a name. (This wins for gdb.) */
3053 tree vfunc_type = make_node (FUNCTION_TYPE);
3054 TREE_TYPE (vfunc_type) = integer_type_node;
3055 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
3056 layout_type (vfunc_type);
3058 vtable_entry_type = build_pointer_type (vfunc_type);
3060 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
3063 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
3064 layout_type (vtbl_type_node);
3065 vtbl_type_node = build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
3066 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
3067 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
3068 layout_type (vtbl_ptr_type_node);
3069 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
3071 push_namespace (get_identifier ("__cxxabiv1"));
3072 abi_node = current_namespace;
3075 global_type_node = make_node (LANG_TYPE);
3076 record_unknown_type (global_type_node, "global type");
3079 current_lang_name = lang_name_cplusplus;
3083 tree bad_alloc_type_node;
3084 tree bad_alloc_decl;
3085 tree newtype, deltype;
3086 tree ptr_ftype_sizetype;
3088 push_namespace (std_identifier);
3089 bad_alloc_id = get_identifier ("bad_alloc");
3090 bad_alloc_type_node = make_aggr_type (RECORD_TYPE);
3091 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3093 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3094 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3095 TYPE_STUB_DECL (bad_alloc_type_node) = bad_alloc_decl;
3099 = build_function_type (ptr_type_node,
3100 tree_cons (NULL_TREE,
3103 newtype = build_exception_variant
3104 (ptr_ftype_sizetype, add_exception_specifier
3105 (NULL_TREE, bad_alloc_type_node, -1));
3106 deltype = build_exception_variant (void_ftype_ptr, empty_except_spec);
3107 push_cp_library_fn (NEW_EXPR, newtype);
3108 push_cp_library_fn (VEC_NEW_EXPR, newtype);
3109 global_delete_fndecl = push_cp_library_fn (DELETE_EXPR, deltype);
3110 push_cp_library_fn (VEC_DELETE_EXPR, deltype);
3114 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype);
3116 /* Perform other language dependent initializations. */
3117 init_class_processing ();
3118 init_rtti_processing ();
3120 if (flag_exceptions)
3121 init_exception_processing ();
3123 if (! supports_one_only ())
3126 make_fname_decl = cp_make_fname_decl;
3127 start_fname_decls ();
3129 /* Show we use EH for cleanups. */
3130 if (flag_exceptions)
3131 using_eh_for_cleanups ();
3134 /* Generate an initializer for a function naming variable from
3135 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
3136 filled in with the type of the init. */
3139 cp_fname_init (const char* name, tree *type_p)
3141 tree domain = NULL_TREE;
3143 tree init = NULL_TREE;
3148 length = strlen (name);
3149 domain = build_index_type (size_int (length));
3150 init = build_string (length + 1, name);
3153 type = build_qualified_type (char_type_node, TYPE_QUAL_CONST);
3154 type = build_cplus_array_type (type, domain);
3159 TREE_TYPE (init) = type;
3161 init = error_mark_node;
3166 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
3167 decl, NAME is the initialization string and TYPE_DEP indicates whether
3168 NAME depended on the type of the function. We make use of that to detect
3169 __PRETTY_FUNCTION__ inside a template fn. This is being done
3170 lazily at the point of first use, so we mustn't push the decl now. */
3173 cp_make_fname_decl (tree id, int type_dep)
3175 const char *const name = (type_dep && processing_template_decl
3176 ? NULL : fname_as_string (type_dep));
3178 tree init = cp_fname_init (name, &type);
3179 tree decl = build_decl (VAR_DECL, id, type);
3182 free ((char *) name);
3184 /* As we're using pushdecl_with_scope, we must set the context. */
3185 DECL_CONTEXT (decl) = current_function_decl;
3186 DECL_PRETTY_FUNCTION_P (decl) = type_dep;
3188 TREE_STATIC (decl) = 1;
3189 TREE_READONLY (decl) = 1;
3190 DECL_ARTIFICIAL (decl) = 1;
3191 DECL_INITIAL (decl) = init;
3193 TREE_USED (decl) = 1;
3195 if (current_function_decl)
3197 struct cp_binding_level *b = current_binding_level;
3198 while (b->level_chain->kind != sk_function_parms)
3200 pushdecl_with_scope (decl, b, /*is_friend=*/false);
3201 cp_finish_decl (decl, init, NULL_TREE, LOOKUP_ONLYCONVERTING);
3204 pushdecl_top_level_and_finish (decl, init);
3209 /* Make a definition for a builtin function named NAME in the current
3210 namespace, whose data type is TYPE and whose context is CONTEXT.
3211 TYPE should be a function type with argument types.
3213 CLASS and CODE tell later passes how to compile calls to this function.
3214 See tree.h for possible values.
3216 If LIBNAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3217 the name to be called if we can't opencode the function.
3218 If ATTRS is nonzero, use that for the function's attribute
3222 builtin_function_1 (const char* name,
3225 enum built_in_function code,
3226 enum built_in_class class,
3227 const char* libname,
3230 tree decl = build_library_fn_1 (get_identifier (name), ERROR_MARK, type);
3231 DECL_BUILT_IN_CLASS (decl) = class;
3232 DECL_FUNCTION_CODE (decl) = code;
3233 DECL_CONTEXT (decl) = context;
3237 /* Since `pushdecl' relies on DECL_ASSEMBLER_NAME instead of DECL_NAME,
3238 we cannot change DECL_ASSEMBLER_NAME until we have installed this
3239 function in the namespace. */
3241 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (libname));
3243 /* A function in the user's namespace should have an explicit
3244 declaration before it is used. Mark the built-in function as
3245 anticipated but not actually declared. */
3246 if (name[0] != '_' || name[1] != '_')
3247 DECL_ANTICIPATED (decl) = 1;
3249 /* Possibly apply some default attributes to this built-in function. */
3251 decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
3253 decl_attributes (&decl, NULL_TREE, 0);
3258 /* Entry point for the benefit of c_common_nodes_and_builtins.
3260 Make a definition for a builtin function named NAME and whose data type
3261 is TYPE. TYPE should be a function type with argument types. This
3262 function places the anticipated declaration in the global namespace
3263 and additionally in the std namespace if appropriate.
3265 CLASS and CODE tell later passes how to compile calls to this function.
3266 See tree.h for possible values.
3268 If LIBNAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3269 the name to be called if we can't opencode the function.
3271 If ATTRS is nonzero, use that for the function's attribute
3275 builtin_function (const char* name,
3278 enum built_in_class cl,
3279 const char* libname,
3282 /* All builtins that don't begin with an '_' should additionally
3283 go in the 'std' namespace. */
3286 push_namespace (std_identifier);
3287 builtin_function_1 (name, type, std_node, code, cl, libname, attrs);
3291 return builtin_function_1 (name, type, NULL_TREE, code,
3292 cl, libname, attrs);
3295 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
3296 function. Not called directly. */
3299 build_library_fn_1 (tree name, enum tree_code operator_code, tree type)
3301 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
3302 DECL_EXTERNAL (fn) = 1;
3303 TREE_PUBLIC (fn) = 1;
3304 DECL_ARTIFICIAL (fn) = 1;
3305 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
3306 SET_DECL_LANGUAGE (fn, lang_c);
3307 /* Runtime library routines are, by definition, available in an
3308 external shared object. */
3309 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
3310 DECL_VISIBILITY_SPECIFIED (fn) = 1;
3314 /* Returns the _DECL for a library function with C linkage.
3315 We assume that such functions never throw; if this is incorrect,
3316 callers should unset TREE_NOTHROW. */
3319 build_library_fn (tree name, tree type)
3321 tree fn = build_library_fn_1 (name, ERROR_MARK, type);
3322 TREE_NOTHROW (fn) = 1;
3326 /* Returns the _DECL for a library function with C++ linkage. */
3329 build_cp_library_fn (tree name, enum tree_code operator_code, tree type)
3331 tree fn = build_library_fn_1 (name, operator_code, type);
3332 TREE_NOTHROW (fn) = TYPE_NOTHROW_P (type);
3333 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
3334 SET_DECL_LANGUAGE (fn, lang_cplusplus);
3338 /* Like build_library_fn, but takes a C string instead of an
3342 build_library_fn_ptr (const char* name, tree type)
3344 return build_library_fn (get_identifier (name), type);
3347 /* Like build_cp_library_fn, but takes a C string instead of an
3351 build_cp_library_fn_ptr (const char* name, tree type)
3353 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type);
3356 /* Like build_library_fn, but also pushes the function so that we will
3357 be able to find it via IDENTIFIER_GLOBAL_VALUE. */
3360 push_library_fn (tree name, tree type)
3362 tree fn = build_library_fn (name, type);
3363 pushdecl_top_level (fn);
3367 /* Like build_cp_library_fn, but also pushes the function so that it
3368 will be found by normal lookup. */
3371 push_cp_library_fn (enum tree_code operator_code, tree type)
3373 tree fn = build_cp_library_fn (ansi_opname (operator_code),
3380 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
3384 push_void_library_fn (tree name, tree parmtypes)
3386 tree type = build_function_type (void_type_node, parmtypes);
3387 return push_library_fn (name, type);
3390 /* Like push_library_fn, but also note that this function throws
3391 and does not return. Used for __throw_foo and the like. */
3394 push_throw_library_fn (tree name, tree type)
3396 tree fn = push_library_fn (name, type);
3397 TREE_THIS_VOLATILE (fn) = 1;
3398 TREE_NOTHROW (fn) = 0;
3402 /* When we call finish_struct for an anonymous union, we create
3403 default copy constructors and such. But, an anonymous union
3404 shouldn't have such things; this function undoes the damage to the
3405 anonymous union type T.
3407 (The reason that we create the synthesized methods is that we don't
3408 distinguish `union { int i; }' from `typedef union { int i; } U'.
3409 The first is an anonymous union; the second is just an ordinary
3413 fixup_anonymous_aggr (tree t)
3417 /* Wipe out memory of synthesized methods. */
3418 TYPE_HAS_CONSTRUCTOR (t) = 0;
3419 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
3420 TYPE_HAS_INIT_REF (t) = 0;
3421 TYPE_HAS_CONST_INIT_REF (t) = 0;
3422 TYPE_HAS_ASSIGN_REF (t) = 0;
3423 TYPE_HAS_CONST_ASSIGN_REF (t) = 0;
3425 /* Splice the implicitly generated functions out of the TYPE_METHODS
3427 q = &TYPE_METHODS (t);
3430 if (DECL_ARTIFICIAL (*q))
3431 *q = TREE_CHAIN (*q);
3433 q = &TREE_CHAIN (*q);
3436 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
3437 if (TYPE_METHODS (t))
3438 error ("%Jan anonymous union cannot have function members",
3439 TYPE_MAIN_DECL (t));
3441 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
3442 assignment operators (because they cannot have these methods themselves).
3443 For anonymous unions this is already checked because they are not allowed
3444 in any union, otherwise we have to check it. */
3445 if (TREE_CODE (t) != UNION_TYPE)
3449 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
3450 if (TREE_CODE (field) == FIELD_DECL)
3452 type = TREE_TYPE (field);
3453 if (CLASS_TYPE_P (type))
3455 if (TYPE_NEEDS_CONSTRUCTING (type))
3456 error ("member %q+#D with constructor not allowed "
3457 "in anonymous aggregate", field);
3458 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
3459 error ("member %q+#D with destructor not allowed "
3460 "in anonymous aggregate", field);
3461 if (TYPE_HAS_COMPLEX_ASSIGN_REF (type))
3462 error ("member %q+#D with copy assignment operator "
3463 "not allowed in anonymous aggregate", field);
3469 /* Make sure that a declaration with no declarator is well-formed, i.e.
3470 just declares a tagged type or anonymous union.
3472 Returns the type declared; or NULL_TREE if none. */
3475 check_tag_decl (cp_decl_specifier_seq *declspecs)
3477 int saw_friend = declspecs->specs[(int)ds_friend] != 0;
3478 int saw_typedef = declspecs->specs[(int)ds_typedef] != 0;
3479 /* If a class, struct, or enum type is declared by the DECLSPECS
3480 (i.e, if a class-specifier, enum-specifier, or non-typename
3481 elaborated-type-specifier appears in the DECLSPECS),
3482 DECLARED_TYPE is set to the corresponding type. */
3483 tree declared_type = NULL_TREE;
3484 bool error_p = false;
3486 if (declspecs->multiple_types_p)
3487 error ("multiple types in one declaration");
3488 else if (declspecs->redefined_builtin_type)
3490 if (!in_system_header)
3491 pedwarn ("redeclaration of C++ built-in type %qT",
3492 declspecs->redefined_builtin_type);
3497 && TYPE_P (declspecs->type)
3498 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
3499 && IS_AGGR_TYPE (declspecs->type))
3500 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
3501 declared_type = declspecs->type;
3502 else if (declspecs->type == error_mark_node)
3504 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
3505 pedwarn ("declaration does not declare anything");
3506 /* Check for an anonymous union. */
3507 else if (declared_type && IS_AGGR_TYPE_CODE (TREE_CODE (declared_type))
3508 && TYPE_ANONYMOUS_P (declared_type))
3510 /* 7/3 In a simple-declaration, the optional init-declarator-list
3511 can be omitted only when declaring a class (clause 9) or
3512 enumeration (7.2), that is, when the decl-specifier-seq contains
3513 either a class-specifier, an elaborated-type-specifier with
3514 a class-key (9.1), or an enum-specifier. In these cases and
3515 whenever a class-specifier or enum-specifier is present in the
3516 decl-specifier-seq, the identifiers in these specifiers are among
3517 the names being declared by the declaration (as class-name,
3518 enum-names, or enumerators, depending on the syntax). In such
3519 cases, and except for the declaration of an unnamed bit-field (9.6),
3520 the decl-specifier-seq shall introduce one or more names into the
3521 program, or shall redeclare a name introduced by a previous
3522 declaration. [Example:
3523 enum { }; // ill-formed
3524 typedef class { }; // ill-formed
3528 error ("missing type-name in typedef-declaration");
3531 /* Anonymous unions are objects, so they can have specifiers. */;
3532 SET_ANON_AGGR_TYPE_P (declared_type);
3534 if (TREE_CODE (declared_type) != UNION_TYPE && pedantic
3535 && !in_system_header)
3536 pedwarn ("ISO C++ prohibits anonymous structs");
3541 if (declspecs->specs[(int)ds_inline]
3542 || declspecs->specs[(int)ds_virtual])
3543 error ("%qs can only be specified for functions",
3544 declspecs->specs[(int)ds_inline]
3545 ? "inline" : "virtual");
3547 && (!current_class_type
3548 || current_scope () != current_class_type))
3549 error ("%<friend%> can only be specified inside a class");
3550 else if (declspecs->specs[(int)ds_explicit])
3551 error ("%<explicit%> can only be specified for constructors");
3552 else if (declspecs->storage_class)
3553 error ("a storage class can only be specified for objects "
3555 else if (declspecs->specs[(int)ds_const]
3556 || declspecs->specs[(int)ds_volatile]
3557 || declspecs->specs[(int)ds_restrict]
3558 || declspecs->specs[(int)ds_thread])
3559 error ("qualifiers can only be specified for objects "
3563 return declared_type;
3566 /* Called when a declaration is seen that contains no names to declare.
3567 If its type is a reference to a structure, union or enum inherited
3568 from a containing scope, shadow that tag name for the current scope
3569 with a forward reference.
3570 If its type defines a new named structure or union
3571 or defines an enum, it is valid but we need not do anything here.
3572 Otherwise, it is an error.
3574 C++: may have to grok the declspecs to learn about static,
3575 complain for anonymous unions.
3577 Returns the TYPE declared -- or NULL_TREE if none. */
3580 shadow_tag (cp_decl_specifier_seq *declspecs)
3582 tree t = check_tag_decl (declspecs);
3587 if (declspecs->attributes)
3589 warning (0, "attribute ignored in declaration of %q+#T", t);
3590 warning (0, "attribute for %q+#T must follow the %qs keyword",
3591 t, class_key_or_enum_as_string (t));
3595 maybe_process_partial_specialization (t);
3597 /* This is where the variables in an anonymous union are
3598 declared. An anonymous union declaration looks like:
3600 because there is no declarator after the union, the parser
3601 sends that declaration here. */
3602 if (ANON_AGGR_TYPE_P (t))
3604 fixup_anonymous_aggr (t);
3606 if (TYPE_FIELDS (t))
3608 tree decl = grokdeclarator (/*declarator=*/NULL,
3609 declspecs, NORMAL, 0, NULL);
3610 finish_anon_union (decl);
3617 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3620 groktypename (cp_decl_specifier_seq *type_specifiers,
3621 const cp_declarator *declarator)
3625 attrs = type_specifiers->attributes;
3626 type_specifiers->attributes = NULL_TREE;
3627 type = grokdeclarator (declarator, type_specifiers, TYPENAME, 0, &attrs);
3629 cplus_decl_attributes (&type, attrs, 0);
3633 /* Decode a declarator in an ordinary declaration or data definition.
3634 This is called as soon as the type information and variable name
3635 have been parsed, before parsing the initializer if any.
3636 Here we create the ..._DECL node, fill in its type,
3637 and put it on the list of decls for the current context.
3638 The ..._DECL node is returned as the value.
3640 Exception: for arrays where the length is not specified,
3641 the type is left null, to be filled in by `cp_finish_decl'.
3643 Function definitions do not come here; they go to start_function
3644 instead. However, external and forward declarations of functions
3645 do go through here. Structure field declarations are done by
3646 grokfield and not through here. */
3649 start_decl (const cp_declarator *declarator,
3650 cp_decl_specifier_seq *declspecs,
3653 tree prefix_attributes,
3654 tree *pushed_scope_p)
3660 *pushed_scope_p = NULL_TREE;
3662 /* This should only be done once on the top most decl. */
3663 if (have_extern_spec)
3665 declspecs->storage_class = sc_extern;
3666 have_extern_spec = false;
3669 /* An object declared as __attribute__((deprecated)) suppresses
3670 warnings of uses of other deprecated items. */
3671 if (lookup_attribute ("deprecated", attributes))
3672 deprecated_state = DEPRECATED_SUPPRESS;
3674 attributes = chainon (attributes, prefix_attributes);
3676 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
3679 deprecated_state = DEPRECATED_NORMAL;
3681 if (decl == NULL_TREE || TREE_CODE (decl) == VOID_TYPE
3682 || decl == error_mark_node)
3683 return error_mark_node;
3685 type = TREE_TYPE (decl);
3687 context = DECL_CONTEXT (decl);
3691 *pushed_scope_p = push_scope (context);
3693 /* We are only interested in class contexts, later. */
3694 if (TREE_CODE (context) == NAMESPACE_DECL)
3695 context = NULL_TREE;
3699 /* Is it valid for this decl to have an initializer at all?
3700 If not, set INITIALIZED to zero, which will indirectly
3701 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
3702 switch (TREE_CODE (decl))
3705 error ("typedef %qD is initialized (use __typeof__ instead)", decl);
3710 error ("function %q#D is initialized like a variable", decl);
3720 if (! toplevel_bindings_p ()
3721 && DECL_EXTERNAL (decl))
3722 warning (0, "declaration of %q#D has %<extern%> and is initialized",
3724 DECL_EXTERNAL (decl) = 0;
3725 if (toplevel_bindings_p ())
3726 TREE_STATIC (decl) = 1;
3728 /* Tell `pushdecl' this is an initialized decl
3729 even though we don't yet have the initializer expression.
3730 Also tell `cp_finish_decl' it may store the real initializer. */
3731 DECL_INITIAL (decl) = error_mark_node;
3734 /* Set attributes here so if duplicate decl, will have proper attributes. */
3735 cplus_decl_attributes (&decl, attributes, 0);
3737 /* If #pragma weak was used, mark the decl weak now. */
3738 maybe_apply_pragma_weak (decl);
3740 if (TREE_CODE (decl) == FUNCTION_DECL
3741 && DECL_DECLARED_INLINE_P (decl)
3742 && DECL_UNINLINABLE (decl)
3743 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
3744 warning (0, "inline function %q+D given attribute noinline", decl);
3746 if (context && COMPLETE_TYPE_P (complete_type (context)))
3748 if (TREE_CODE (decl) == VAR_DECL)
3750 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
3751 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
3752 error ("%q#D is not a static member of %q#T", decl, context);
3755 if (DECL_CONTEXT (field) != context)
3757 if (!same_type_p (DECL_CONTEXT (field), context))
3758 pedwarn ("ISO C++ does not permit %<%T::%D%> "
3759 "to be defined as %<%T::%D%>",
3760 DECL_CONTEXT (field), DECL_NAME (decl),
3761 context, DECL_NAME (decl));
3762 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
3764 if (processing_specialization
3765 && template_class_depth (context) == 0
3766 && CLASSTYPE_TEMPLATE_SPECIALIZATION (context))
3767 error ("template header not allowed in member definition "
3768 "of explicitly specialized class");
3769 /* Static data member are tricky; an in-class initialization
3770 still doesn't provide a definition, so the in-class
3771 declaration will have DECL_EXTERNAL set, but will have an
3772 initialization. Thus, duplicate_decls won't warn
3773 about this situation, and so we check here. */
3774 if (DECL_INITIAL (decl)
3775 && DECL_INITIALIZED_IN_CLASS_P (field))
3776 error ("duplicate initialization of %qD", decl);
3777 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
3783 tree field = check_classfn (context, decl,
3784 (processing_template_decl
3785 > template_class_depth (context))
3786 ? current_template_parms
3788 if (field && duplicate_decls (decl, field,
3789 /*newdecl_is_friend=*/false))
3793 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
3794 DECL_IN_AGGR_P (decl) = 0;
3795 /* Do not mark DECL as an explicit specialization if it was not
3796 already marked as an instantiation; a declaration should
3797 never be marked as a specialization unless we know what
3798 template is being specialized. */
3799 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
3801 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
3803 /* [temp.expl.spec] An explicit specialization of a static data
3804 member of a template is a definition if the declaration
3805 includes an initializer; otherwise, it is a declaration.
3807 We check for processing_specialization so this only applies
3808 to the new specialization syntax. */
3809 if (!DECL_INITIAL (decl)
3810 && processing_specialization)
3811 DECL_EXTERNAL (decl) = 1;
3814 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl))
3815 pedwarn ("declaration of %q#D outside of class is not definition",
3819 /* Enter this declaration into the symbol table. */
3820 tem = maybe_push_decl (decl);
3822 if (processing_template_decl)
3823 tem = push_template_decl (tem);
3824 if (tem == error_mark_node)
3825 return error_mark_node;
3827 #if ! defined (ASM_OUTPUT_BSS) && ! defined (ASM_OUTPUT_ALIGNED_BSS)
3828 /* Tell the back-end to use or not use .common as appropriate. If we say
3829 -fconserve-space, we want this to save .data space, at the expense of
3830 wrong semantics. If we say -fno-conserve-space, we want this to
3831 produce errors about redefs; to do this we force variables into the
3833 DECL_COMMON (tem) = ((TREE_CODE (tem) != VAR_DECL
3834 || !DECL_THREAD_LOCAL_P (tem))
3835 && (flag_conserve_space || ! TREE_PUBLIC (tem)));
3838 if (! processing_template_decl)
3845 start_decl_1 (tree decl)
3847 tree type = TREE_TYPE (decl);
3848 int initialized = (DECL_INITIAL (decl) != NULL_TREE);
3850 if (type == error_mark_node)
3854 /* Is it valid for this decl to have an initializer at all?
3855 If not, set INITIALIZED to zero, which will indirectly
3856 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
3858 /* Don't allow initializations for incomplete types except for
3859 arrays which might be completed by the initialization. */
3860 if (COMPLETE_TYPE_P (complete_type (type)))
3861 ; /* A complete type is ok. */
3862 else if (TREE_CODE (type) != ARRAY_TYPE)
3864 error ("variable %q#D has initializer but incomplete type", decl);
3866 type = TREE_TYPE (decl) = error_mark_node;
3868 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
3870 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
3871 error ("elements of array %q#D have incomplete type", decl);
3872 /* else we already gave an error in start_decl. */
3878 && TREE_CODE (decl) != TYPE_DECL
3879 && TREE_CODE (decl) != TEMPLATE_DECL
3880 && type != error_mark_node
3881 && IS_AGGR_TYPE (type)
3882 && ! DECL_EXTERNAL (decl))
3884 if ((! processing_template_decl || ! uses_template_parms (type))
3885 && !COMPLETE_TYPE_P (complete_type (type)))
3887 error ("aggregate %q#D has incomplete type and cannot be defined",
3889 /* Change the type so that assemble_variable will give
3890 DECL an rtl we can live with: (mem (const_int 0)). */
3891 type = TREE_TYPE (decl) = error_mark_node;
3895 /* If any base type in the hierarchy of TYPE needs a constructor,
3896 then we set initialized to 1. This way any nodes which are
3897 created for the purposes of initializing this aggregate
3898 will live as long as it does. This is necessary for global
3899 aggregates which do not have their initializers processed until
3900 the end of the file. */
3901 initialized = TYPE_NEEDS_CONSTRUCTING (type);
3906 DECL_INITIAL (decl) = NULL_TREE;
3908 /* Create a new scope to hold this declaration if necessary.
3909 Whether or not a new scope is necessary cannot be determined
3910 until after the type has been completed; if the type is a
3911 specialization of a class template it is not until after
3912 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
3913 will be set correctly. */
3914 maybe_push_cleanup_level (type);
3917 /* Handle initialization of references. DECL, TYPE, and INIT have the
3918 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
3919 but will be set to a new CLEANUP_STMT if a temporary is created
3920 that must be destroyed subsequently.
3922 Returns an initializer expression to use to initialize DECL, or
3923 NULL if the initialization can be performed statically.
3925 Quotes on semantics can be found in ARM 8.4.3. */
3928 grok_reference_init (tree decl, tree type, tree init, tree *cleanup)
3932 if (init == NULL_TREE)
3934 if ((DECL_LANG_SPECIFIC (decl) == 0
3935 || DECL_IN_AGGR_P (decl) == 0)
3936 && ! DECL_THIS_EXTERN (decl))
3937 error ("%qD declared as reference but not initialized", decl);
3941 if (TREE_CODE (init) == CONSTRUCTOR)
3943 error ("ISO C++ forbids use of initializer list to "
3944 "initialize reference %qD", decl);
3948 if (TREE_CODE (init) == TREE_LIST)
3949 init = build_x_compound_expr_from_list (init, "initializer");
3951 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
3952 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
3953 /* Note: default conversion is only called in very special cases. */
3954 init = decay_conversion (init);
3956 /* Convert INIT to the reference type TYPE. This may involve the
3957 creation of a temporary, whose lifetime must be the same as that
3958 of the reference. If so, a DECL_EXPR for the temporary will be
3959 added just after the DECL_EXPR for DECL. That's why we don't set
3960 DECL_INITIAL for local references (instead assigning to them
3961 explicitly); we need to allow the temporary to be initialized
3963 tmp = initialize_reference (type, init, decl, cleanup);
3965 if (tmp == error_mark_node)
3967 else if (tmp == NULL_TREE)
3969 error ("cannot initialize %qT from %qT", type, TREE_TYPE (init));
3973 if (TREE_STATIC (decl) && !TREE_CONSTANT (tmp))
3976 DECL_INITIAL (decl) = tmp;
3981 /* When parsing `int a[] = {1, 2};' we don't know the size of the
3982 array until we finish parsing the initializer. If that's the
3983 situation we're in, update DECL accordingly. */
3986 maybe_deduce_size_from_array_init (tree decl, tree init)
3988 tree type = TREE_TYPE (decl);
3990 if (TREE_CODE (type) == ARRAY_TYPE
3991 && TYPE_DOMAIN (type) == NULL_TREE
3992 && TREE_CODE (decl) != TYPE_DECL)
3994 /* do_default is really a C-ism to deal with tentative definitions.
3995 But let's leave it here to ease the eventual merge. */
3996 int do_default = !DECL_EXTERNAL (decl);
3997 tree initializer = init ? init : DECL_INITIAL (decl);
3998 int failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
4002 error ("initializer fails to determine size of %qD", decl);
4007 error ("array size missing in %qD", decl);
4008 /* If a `static' var's size isn't known, make it extern as
4009 well as static, so it does not get allocated. If it's not
4010 `static', then don't mark it extern; finish_incomplete_decl
4011 will give it a default size and it will get allocated. */
4012 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4013 DECL_EXTERNAL (decl) = 1;
4017 error ("zero-size array %qD", decl);
4019 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
4021 layout_decl (decl, 0);
4025 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
4026 any appropriate error messages regarding the layout. */
4029 layout_var_decl (tree decl)
4031 tree type = TREE_TYPE (decl);
4033 /* If we haven't already layed out this declaration, do so now.
4034 Note that we must not call complete type for an external object
4035 because it's type might involve templates that we are not
4036 supposed to instantiate yet. (And it's perfectly valid to say
4037 `extern X x' for some incomplete type `X'.) */
4038 if (!DECL_EXTERNAL (decl))
4039 complete_type (type);
4040 if (!DECL_SIZE (decl)
4041 && TREE_TYPE (decl) != error_mark_node
4042 && (COMPLETE_TYPE_P (type)
4043 || (TREE_CODE (type) == ARRAY_TYPE
4044 && !TYPE_DOMAIN (type)
4045 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
4046 layout_decl (decl, 0);
4048 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
4050 /* An automatic variable with an incomplete type: that is an error.
4051 Don't talk about array types here, since we took care of that
4052 message in grokdeclarator. */
4053 error ("storage size of %qD isn't known", decl);
4054 TREE_TYPE (decl) = error_mark_node;
4057 /* Keep this code around in case we later want to control debug info
4058 based on whether a type is "used". (jason 1999-11-11) */
4060 else if (!DECL_EXTERNAL (decl) && IS_AGGR_TYPE (ttype))
4061 /* Let debugger know it should output info for this type. */
4062 note_debug_info_needed (ttype);
4064 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4065 note_debug_info_needed (DECL_CONTEXT (decl));
4068 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4069 && DECL_SIZE (decl) != NULL_TREE
4070 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4072 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4073 constant_expression_warning (DECL_SIZE (decl));
4075 error ("storage size of %qD isn't constant", decl);
4078 if (TREE_STATIC (decl)
4079 && !DECL_ARTIFICIAL (decl)
4080 && current_function_decl
4081 && DECL_CONTEXT (decl) == current_function_decl)
4082 push_local_name (decl);
4085 /* If a local static variable is declared in an inline function, or if
4086 we have a weak definition, we must endeavor to create only one
4087 instance of the variable at link-time. */
4090 maybe_commonize_var (tree decl)
4092 /* Static data in a function with comdat linkage also has comdat
4094 if (TREE_STATIC (decl)
4095 /* Don't mess with __FUNCTION__. */
4096 && ! DECL_ARTIFICIAL (decl)
4097 && DECL_FUNCTION_SCOPE_P (decl)
4098 /* Unfortunately, import_export_decl has not always been called
4099 before the function is processed, so we cannot simply check
4101 && (DECL_COMDAT (DECL_CONTEXT (decl))
4102 || ((DECL_DECLARED_INLINE_P (DECL_CONTEXT (decl))
4103 || DECL_TEMPLATE_INSTANTIATION (DECL_CONTEXT (decl)))
4104 && TREE_PUBLIC (DECL_CONTEXT (decl)))))
4108 /* With weak symbols, we simply make the variable COMDAT;
4109 that will cause copies in multiple translations units to
4111 comdat_linkage (decl);
4115 if (DECL_INITIAL (decl) == NULL_TREE
4116 || DECL_INITIAL (decl) == error_mark_node)
4118 /* Without weak symbols, we can use COMMON to merge
4119 uninitialized variables. */
4120 TREE_PUBLIC (decl) = 1;
4121 DECL_COMMON (decl) = 1;
4125 /* While for initialized variables, we must use internal
4126 linkage -- which means that multiple copies will not
4128 TREE_PUBLIC (decl) = 0;
4129 DECL_COMMON (decl) = 0;
4130 warning (0, "sorry: semantics of inline function static "
4131 "data %q+#D are wrong (you'll wind up "
4132 "with multiple copies)", decl);
4133 warning (0, "%J you can work around this by removing "
4139 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4140 /* Set it up again; we might have set DECL_INITIAL since the last
4142 comdat_linkage (decl);
4145 /* Issue an error message if DECL is an uninitialized const variable. */
4148 check_for_uninitialized_const_var (tree decl)
4150 tree type = TREE_TYPE (decl);
4152 /* ``Unless explicitly declared extern, a const object does not have
4153 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4155 if (TREE_CODE (decl) == VAR_DECL
4156 && TREE_CODE (type) != REFERENCE_TYPE
4157 && CP_TYPE_CONST_P (type)
4158 && !TYPE_NEEDS_CONSTRUCTING (type)
4159 && !DECL_INITIAL (decl))
4160 error ("uninitialized const %qD", decl);
4164 /* Structure holding the current initializer being processed by reshape_init.
4165 CUR is a pointer to the current element being processed, END is a pointer
4166 after the last element present in the initializer. */
4167 typedef struct reshape_iterator_t
4169 constructor_elt *cur;
4170 constructor_elt *end;
4173 static tree reshape_init_r (tree, reshape_iter *, bool);
4175 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4176 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4177 initialized. If there are no more such fields, the return value
4181 next_initializable_field (tree field)
4184 && (TREE_CODE (field) != FIELD_DECL
4185 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4186 || DECL_ARTIFICIAL (field)))
4187 field = TREE_CHAIN (field);
4192 /* Subroutine of reshape_init_array and reshape_init_vector, which does
4193 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
4194 INTEGER_CST representing the size of the array minus one (the maximum index),
4195 or NULL_TREE if the array was declared without specifying the size. D is
4196 the iterator within the constructor. */
4199 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d)
4202 bool sized_array_p = (max_index != NULL_TREE);
4203 unsigned HOST_WIDE_INT max_index_cst = 0;
4204 unsigned HOST_WIDE_INT index;
4206 /* The initializer for an array is always a CONSTRUCTOR. */
4207 new_init = build_constructor (NULL_TREE, NULL);
4211 /* Minus 1 is used for zero sized arrays. */
4212 if (integer_all_onesp (max_index))
4215 if (host_integerp (max_index, 1))
4216 max_index_cst = tree_low_cst (max_index, 1);
4217 /* sizetype is sign extended, not zero extended. */
4219 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
4223 /* Loop until there are no more initializers. */
4225 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
4232 /* Handle array designated initializers (GNU extension). */
4233 if (TREE_CODE (d->cur->index) == IDENTIFIER_NODE)
4235 error ("name %qD used in a GNU-style designated "
4236 "initializer for an array", d->cur->index);
4242 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false);
4243 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), NULL_TREE, elt_init);
4249 /* Subroutine of reshape_init_r, processes the initializers for arrays.
4250 Parameters are the same of reshape_init_r. */
4253 reshape_init_array (tree type, reshape_iter *d)
4255 tree max_index = NULL_TREE;
4257 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
4259 if (TYPE_DOMAIN (type))
4260 max_index = array_type_nelts (type);
4262 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4265 /* Subroutine of reshape_init_r, processes the initializers for vectors.
4266 Parameters are the same of reshape_init_r. */
4269 reshape_init_vector (tree type, reshape_iter *d)
4271 tree max_index = NULL_TREE;
4274 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
4276 if (COMPOUND_LITERAL_P (d->cur->value))
4278 tree value = d->cur->value;
4279 if (!same_type_p (TREE_TYPE (value), type))
4281 error ("invalid type %qT as initializer for a vector of type %qT",
4282 TREE_TYPE (d->cur->value), type);
4283 value = error_mark_node;
4289 /* For a vector, the representation type is a struct
4290 containing a single member which is an array of the
4291 appropriate size. */
4292 rtype = TYPE_DEBUG_REPRESENTATION_TYPE (type);
4293 if (rtype && TYPE_DOMAIN (TREE_TYPE (TYPE_FIELDS (rtype))))
4294 max_index = array_type_nelts (TREE_TYPE (TYPE_FIELDS (rtype)));
4296 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4299 /* Subroutine of reshape_init_r, processes the initializers for classes
4300 or union. Parameters are the same of reshape_init_r. */
4303 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p)
4308 gcc_assert (CLASS_TYPE_P (type));
4310 /* The initializer for a class is always a CONSTRUCTOR. */
4311 new_init = build_constructor (NULL_TREE, NULL);
4312 field = next_initializable_field (TYPE_FIELDS (type));
4318 An initializer for an aggregate member that is an
4319 empty class shall have the form of an empty
4320 initializer-list {}. */
4321 if (!first_initializer_p)
4323 error ("initializer for %qT must be brace-enclosed", type);
4324 return error_mark_node;
4329 /* Loop through the initializable fields, gathering initializers. */
4330 while (d->cur != d->end)
4334 /* Handle designated initializers, as an extension. */
4338 pedwarn ("ISO C++ does not allow designated initializers");
4340 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
4342 if (!field || TREE_CODE (field) != FIELD_DECL)
4343 error ("%qT has no non-static data member named %qD", type,
4347 /* If we processed all the member of the class, we are done. */
4351 field_init = reshape_init_r (TREE_TYPE (field), d,
4352 /*first_initializer_p=*/false);
4353 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
4357 When a union is initialized with a brace-enclosed
4358 initializer, the braces shall only contain an
4359 initializer for the first member of the union. */
4360 if (TREE_CODE (type) == UNION_TYPE)
4363 field = next_initializable_field (TREE_CHAIN (field));
4369 /* Subroutine of reshape_init, which processes a single initializer (part of
4370 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
4371 iterator within the CONSTRUCTOR which points to the initializer to process.
4372 FIRST_INITIALIZER_P is true if this is the first initializer of the
4373 CONSTRUCTOR node. */
4376 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p)
4378 tree init = d->cur->value;
4380 /* A non-aggregate type is always initialized with a single
4382 if (!CP_AGGREGATE_TYPE_P (type))
4384 /* It is invalid to initialize a non-aggregate type with a
4385 brace-enclosed initializer.
4386 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
4387 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
4388 a CONSTRUCTOR (with a record type). */
4389 if (TREE_CODE (init) == CONSTRUCTOR
4390 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
4392 error ("braces around scalar initializer for type %qT", type);
4393 init = error_mark_node;
4402 All implicit type conversions (clause _conv_) are considered when
4403 initializing the aggregate member with an initializer from an
4404 initializer-list. If the initializer can initialize a member,
4405 the member is initialized. Otherwise, if the member is itself a
4406 non-empty subaggregate, brace elision is assumed and the
4407 initializer is considered for the initialization of the first
4408 member of the subaggregate. */
4409 if (TREE_CODE (init) != CONSTRUCTOR
4410 && can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL))
4416 /* [dcl.init.string]
4418 A char array (whether plain char, signed char, or unsigned char)
4419 can be initialized by a string-literal (optionally enclosed in
4420 braces); a wchar_t array can be initialized by a wide
4421 string-literal (optionally enclosed in braces). */
4422 if (TREE_CODE (type) == ARRAY_TYPE
4423 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
4425 tree str_init = init;
4427 /* Strip one level of braces if and only if they enclose a single
4428 element (as allowed by [dcl.init.string]). */
4429 if (!first_initializer_p
4430 && TREE_CODE (str_init) == CONSTRUCTOR
4431 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (str_init)) == 1)
4433 str_init = VEC_index (constructor_elt,
4434 CONSTRUCTOR_ELTS (str_init), 0)->value;
4437 /* If it's a string literal, then it's the initializer for the array
4438 as a whole. Otherwise, continue with normal initialization for
4439 array types (one value per array element). */
4440 if (TREE_CODE (str_init) == STRING_CST)
4447 /* The following cases are about aggregates. If we are not within a full
4448 initializer already, and there is not a CONSTRUCTOR, it means that there
4449 is a missing set of braces (that is, we are processing the case for
4450 which reshape_init exists). */
4451 if (!first_initializer_p)
4453 if (TREE_CODE (init) == CONSTRUCTOR)
4455 /* For a nested compound literal, there is no need to reshape since
4456 brace elision is not allowed. Even if we decided to allow it,
4457 we should add a call to reshape_init in finish_compound_literal,
4458 before calling digest_init, so changing this code would still
4459 not be necessary. */
4460 if (!COMPOUND_LITERAL_P (init))
4463 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
4464 return reshape_init (type, init);
4467 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
4470 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
4474 /* Dispatch to specialized routines. */
4475 if (CLASS_TYPE_P (type))
4476 return reshape_init_class (type, d, first_initializer_p);
4477 else if (TREE_CODE (type) == ARRAY_TYPE)
4478 return reshape_init_array (type, d);
4479 else if (TREE_CODE (type) == VECTOR_TYPE)
4480 return reshape_init_vector (type, d);
4485 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
4486 brace-enclosed aggregate initializer.
4488 INIT is the CONSTRUCTOR containing the list of initializers describing
4489 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
4490 It may not presently match the shape of the TYPE; for example:
4492 struct S { int a; int b; };
4493 struct S a[] = { 1, 2, 3, 4 };
4495 Here INIT will hold a VEC of four elements, rather than a
4496 VEC of two elements, each itself a VEC of two elements. This
4497 routine transforms INIT from the former form into the latter. The
4498 revised CONSTRUCTOR node is returned. */
4501 reshape_init (tree type, tree init)
4503 VEC(constructor_elt, gc) *v;
4507 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
4509 v = CONSTRUCTOR_ELTS (init);
4511 /* An empty constructor does not need reshaping, and it is always a valid
4513 if (VEC_empty (constructor_elt, v))
4516 /* Recurse on this CONSTRUCTOR. */
4517 d.cur = VEC_index (constructor_elt, v, 0);
4518 d.end = d.cur + VEC_length (constructor_elt, v);
4520 new_init = reshape_init_r (type, &d, true);
4522 /* Make sure all the element of the constructor were used. Otherwise,
4523 issue an error about exceeding initializers. */
4525 error ("too many initializers for %qT", type);
4530 /* Verify INIT (the initializer for DECL), and record the
4531 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
4532 grok_reference_init.
4534 If the return value is non-NULL, it is an expression that must be
4535 evaluated dynamically to initialize DECL. */
4538 check_initializer (tree decl, tree init, int flags, tree *cleanup)
4540 tree type = TREE_TYPE (decl);
4541 tree init_code = NULL;
4543 /* If `start_decl' didn't like having an initialization, ignore it now. */
4544 if (init != NULL_TREE && DECL_INITIAL (decl) == NULL_TREE)
4547 /* If an initializer is present, DECL_INITIAL has been
4548 error_mark_node, to indicate that an as-of-yet unevaluated
4549 initialization will occur. From now on, DECL_INITIAL reflects
4550 the static initialization -- if any -- of DECL. */
4551 DECL_INITIAL (decl) = NULL_TREE;
4553 /* Things that are going to be initialized need to have complete
4555 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
4557 if (type == error_mark_node)
4558 /* We will have already complained. */
4560 else if (init && COMPLETE_TYPE_P (type)
4561 && !TREE_CONSTANT (TYPE_SIZE (type)))
4563 error ("variable-sized object %qD may not be initialized", decl);
4566 else if (TREE_CODE (type) == ARRAY_TYPE
4567 && !COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4569 error ("elements of array %q#D have incomplete type", decl);
4572 else if (TREE_CODE (type) != ARRAY_TYPE && !COMPLETE_TYPE_P (type))
4574 error ("%qD has incomplete type", decl);
4575 TREE_TYPE (decl) = error_mark_node;
4579 if (TREE_CODE (decl) == CONST_DECL)
4581 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
4583 DECL_INITIAL (decl) = init;
4585 gcc_assert (init != NULL_TREE);
4588 else if (!DECL_EXTERNAL (decl) && TREE_CODE (type) == REFERENCE_TYPE)
4589 init = grok_reference_init (decl, type, init, cleanup);
4592 /* Do not reshape constructors of vectors (they don't need to be
4594 if (TREE_CODE (init) == CONSTRUCTOR
4595 && !COMPOUND_LITERAL_P (init)
4596 && !TREE_TYPE (init)) /* ptrmemfunc */
4598 init = reshape_init (type, init);
4600 if ((*targetm.vector_opaque_p) (type))
4602 error ("opaque vector types cannot be initialized");
4603 init = error_mark_node;
4607 /* If DECL has an array type without a specific bound, deduce the
4608 array size from the initializer. */
4609 maybe_deduce_size_from_array_init (decl, init);
4610 type = TREE_TYPE (decl);
4612 if (TYPE_HAS_CONSTRUCTOR (type) || TYPE_NEEDS_CONSTRUCTING (type))
4614 if (TREE_CODE (type) == ARRAY_TYPE)
4615 goto initialize_aggr;
4616 else if (TREE_CODE (init) == CONSTRUCTOR)
4618 if (TYPE_NON_AGGREGATE_CLASS (type))
4620 error ("%qD must be initialized by constructor, "
4623 init = error_mark_node;
4626 goto dont_use_constructor;
4630 int saved_stmts_are_full_exprs_p;
4633 saved_stmts_are_full_exprs_p = 0;
4634 if (building_stmt_tree ())
4636 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
4637 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
4639 init = build_aggr_init (decl, init, flags);
4640 if (building_stmt_tree ())
4641 current_stmt_tree ()->stmts_are_full_exprs_p =
4642 saved_stmts_are_full_exprs_p;
4648 dont_use_constructor:
4649 if (TREE_CODE (init) != TREE_VEC)
4651 init_code = store_init_value (decl, init);
4652 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
4653 && DECL_INITIAL (decl)
4654 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
4655 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
4656 warning (0, "array %qD initialized by parenthesized string literal %qE",
4657 decl, DECL_INITIAL (decl));
4662 else if (DECL_EXTERNAL (decl))
4664 else if (TYPE_P (type) && TYPE_NEEDS_CONSTRUCTING (type))
4665 goto initialize_aggr;
4666 else if (IS_AGGR_TYPE (type))
4668 tree core_type = strip_array_types (type);
4670 if (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type))
4671 error ("structure %qD with uninitialized const members", decl);
4672 if (CLASSTYPE_REF_FIELDS_NEED_INIT (core_type))
4673 error ("structure %qD with uninitialized reference members", decl);
4675 check_for_uninitialized_const_var (decl);
4678 check_for_uninitialized_const_var (decl);
4680 if (init && init != error_mark_node)
4681 init_code = build2 (INIT_EXPR, type, decl, init);
4686 /* If DECL is not a local variable, give it RTL. */
4689 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
4691 int toplev = toplevel_bindings_p ();
4693 const char *filename;
4695 /* Set the DECL_ASSEMBLER_NAME for the object. */
4698 /* The `register' keyword, when used together with an
4699 asm-specification, indicates that the variable should be
4700 placed in a particular register. */
4701 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
4703 set_user_assembler_name (decl, asmspec);
4704 DECL_HARD_REGISTER (decl) = 1;
4708 if (TREE_CODE (decl) == FUNCTION_DECL
4709 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
4710 set_builtin_user_assembler_name (decl, asmspec);
4711 set_user_assembler_name (decl, asmspec);
4715 /* Handle non-variables up front. */
4716 if (TREE_CODE (decl) != VAR_DECL)
4718 rest_of_decl_compilation (decl, toplev, at_eof);
4722 /* If we see a class member here, it should be a static data
4724 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
4726 gcc_assert (TREE_STATIC (decl));
4727 /* An in-class declaration of a static data member should be
4728 external; it is only a declaration, and not a definition. */
4729 if (init == NULL_TREE)
4730 gcc_assert (DECL_EXTERNAL (decl));
4733 /* We don't create any RTL for local variables. */
4734 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
4737 /* We defer emission of local statics until the corresponding
4738 DECL_EXPR is expanded. */
4739 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
4741 /* We try to defer namespace-scope static constants so that they are
4742 not emitted into the object file unnecessarily. */
4743 filename = input_filename;
4744 if (!DECL_VIRTUAL_P (decl)
4745 && TREE_READONLY (decl)
4746 && DECL_INITIAL (decl) != NULL_TREE
4747 && DECL_INITIAL (decl) != error_mark_node
4749 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
4751 && !TREE_PUBLIC (decl))
4753 /* Fool with the linkage of static consts according to #pragma
4755 struct c_fileinfo *finfo = get_fileinfo (lbasename (filename));
4756 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
4758 TREE_PUBLIC (decl) = 1;
4759 DECL_EXTERNAL (decl) = finfo->interface_only;
4764 /* Likewise for template instantiations. */
4765 else if (DECL_LANG_SPECIFIC (decl)
4766 && DECL_IMPLICIT_INSTANTIATION (decl))
4769 /* If we're not deferring, go ahead and assemble the variable. */
4771 rest_of_decl_compilation (decl, toplev, at_eof);
4774 /* Generate code to initialize DECL (a local variable). */
4777 initialize_local_var (tree decl, tree init)
4779 tree type = TREE_TYPE (decl);
4782 gcc_assert (TREE_CODE (decl) == VAR_DECL
4783 || TREE_CODE (decl) == RESULT_DECL);
4784 gcc_assert (!TREE_STATIC (decl));
4786 if (DECL_SIZE (decl) == NULL_TREE)
4788 /* If we used it already as memory, it must stay in memory. */
4789 DECL_INITIAL (decl) = NULL_TREE;
4790 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
4793 if (DECL_SIZE (decl) && type != error_mark_node)
4797 /* Compute and store the initial value. */
4798 already_used = TREE_USED (decl) || TREE_USED (type);
4800 /* Perform the initialization. */
4803 int saved_stmts_are_full_exprs_p;
4805 gcc_assert (building_stmt_tree ());
4806 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
4807 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
4808 finish_expr_stmt (init);
4809 current_stmt_tree ()->stmts_are_full_exprs_p =
4810 saved_stmts_are_full_exprs_p;
4813 /* Set this to 0 so we can tell whether an aggregate which was
4814 initialized was ever used. Don't do this if it has a
4815 destructor, so we don't complain about the 'resource
4816 allocation is initialization' idiom. Now set
4817 attribute((unused)) on types so decls of that type will be
4818 marked used. (see TREE_USED, above.) */
4819 if (TYPE_NEEDS_CONSTRUCTING (type)
4821 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
4822 && DECL_NAME (decl))
4823 TREE_USED (decl) = 0;
4824 else if (already_used)
4825 TREE_USED (decl) = 1;
4828 /* Generate a cleanup, if necessary. */
4829 cleanup = cxx_maybe_build_cleanup (decl);
4830 if (DECL_SIZE (decl) && cleanup)
4831 finish_decl_cleanup (decl, cleanup);
4834 /* DECL is a VAR_DECL for a compiler-generated variable with static
4835 storage duration (like a virtual table) whose initializer is a
4836 compile-time constant. INIT must be either a TREE_LIST of values,
4837 or a CONSTRUCTOR. Initialize the variable and provide it to the
4841 initialize_artificial_var (tree decl, tree init)
4843 if (TREE_CODE (init) == TREE_LIST)
4844 init = build_constructor_from_list (NULL_TREE, init);
4845 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
4846 DECL_INITIAL (decl) = init;
4847 DECL_INITIALIZED_P (decl) = 1;
4848 determine_visibility (decl);
4849 layout_var_decl (decl);
4850 maybe_commonize_var (decl);
4851 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
4854 /* Finish processing of a declaration;
4855 install its line number and initial value.
4856 If the length of an array type is not known before,
4857 it must be determined now, from the initial value, or it is an error.
4859 INIT holds the value of an initializer that should be allowed to escape
4862 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
4863 if the (init) syntax was used. */
4866 cp_finish_decl (tree decl, tree init, tree asmspec_tree, int flags)
4870 const char *asmspec = NULL;
4871 int was_readonly = 0;
4872 bool var_definition_p = false;
4874 if (decl == error_mark_node)
4879 error ("assignment (not initialization) in declaration");
4883 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
4885 /* Assume no cleanup is required. */
4886 cleanup = NULL_TREE;
4888 /* If a name was specified, get the string. */
4889 if (global_scope_p (current_binding_level))
4890 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
4892 asmspec = TREE_STRING_POINTER (asmspec_tree);
4894 if (init && TREE_CODE (init) == NAMESPACE_DECL)
4896 error ("cannot initialize %qD to namespace %qD", decl, init);
4900 if (current_class_type
4901 && CP_DECL_CONTEXT (decl) == current_class_type
4902 && TYPE_BEING_DEFINED (current_class_type)
4903 && (DECL_INITIAL (decl) || init))
4904 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
4906 type = TREE_TYPE (decl);
4908 if (type == error_mark_node)
4911 if (processing_template_decl)
4913 /* Add this declaration to the statement-tree. */
4914 if (at_function_scope_p ())
4915 add_decl_expr (decl);
4917 if (init && DECL_INITIAL (decl))
4918 DECL_INITIAL (decl) = init;
4919 if (TREE_CODE (decl) == VAR_DECL
4920 && !DECL_PRETTY_FUNCTION_P (decl)
4921 && !dependent_type_p (TREE_TYPE (decl)))
4922 maybe_deduce_size_from_array_init (decl, init);
4927 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
4928 gcc_assert (TREE_CODE (decl) != PARM_DECL);
4930 /* Take care of TYPE_DECLs up front. */
4931 if (TREE_CODE (decl) == TYPE_DECL)
4933 if (type != error_mark_node
4934 && IS_AGGR_TYPE (type) && DECL_NAME (decl))
4936 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
4937 warning (0, "shadowing previous type declaration of %q#D", decl);
4938 set_identifier_type_value (DECL_NAME (decl), decl);
4941 /* If we have installed this as the canonical typedef for this
4942 type, and that type has not been defined yet, delay emitting
4943 the debug information for it, as we will emit it later. */
4944 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
4945 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
4946 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
4948 rest_of_decl_compilation (decl, DECL_CONTEXT (decl) == NULL_TREE,
4953 /* A reference will be modified here, as it is initialized. */
4954 if (! DECL_EXTERNAL (decl)
4955 && TREE_READONLY (decl)
4956 && TREE_CODE (type) == REFERENCE_TYPE)
4959 TREE_READONLY (decl) = 0;
4962 if (TREE_CODE (decl) == VAR_DECL)
4964 /* Only PODs can have thread-local storage. Other types may require
4965 various kinds of non-trivial initialization. */
4966 if (DECL_THREAD_LOCAL_P (decl) && !pod_type_p (TREE_TYPE (decl)))
4967 error ("%qD cannot be thread-local because it has non-POD type %qT",
4968 decl, TREE_TYPE (decl));
4969 /* Convert the initializer to the type of DECL, if we have not
4970 already initialized DECL. */
4971 if (!DECL_INITIALIZED_P (decl)
4972 /* If !DECL_EXTERNAL then DECL is being defined. In the
4973 case of a static data member initialized inside the
4974 class-specifier, there can be an initializer even if DECL
4975 is *not* defined. */
4976 && (!DECL_EXTERNAL (decl) || init))
4979 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
4980 init = check_initializer (decl, init, flags, &cleanup);
4981 /* Thread-local storage cannot be dynamically initialized. */
4982 if (DECL_THREAD_LOCAL_P (decl) && init)
4984 error ("%qD is thread-local and so cannot be dynamically "
4985 "initialized", decl);
4989 /* Check that the initializer for a static data member was a
4990 constant. Although we check in the parser that the
4991 initializer is an integral constant expression, we do not
4992 simplify division-by-zero at the point at which it
4993 occurs. Therefore, in:
4995 struct S { static const int i = 7 / 0; };
4997 we issue an error at this point. It would
4998 probably be better to forbid division by zero in
4999 integral constant expressions. */
5000 if (DECL_EXTERNAL (decl) && init)
5002 error ("%qD cannot be initialized by a non-constant expression"
5003 " when being declared", decl);
5004 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
5012 The memory occupied by any object of static storage
5013 duration is zero-initialized at program startup before
5014 any other initialization takes place.
5016 We cannot create an appropriate initializer until after
5017 the type of DECL is finalized. If DECL_INITIAL is set,
5018 then the DECL is statically initialized, and any
5019 necessary zero-initialization has already been performed. */
5020 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
5021 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
5022 /*nelts=*/NULL_TREE,
5023 /*static_storage_p=*/true);
5024 /* Remember that the initialization for this variable has
5026 DECL_INITIALIZED_P (decl) = 1;
5027 /* This declaration is the definition of this variable,
5028 unless we are initializing a static data member within
5029 the class specifier. */
5030 if (!DECL_EXTERNAL (decl))
5031 var_definition_p = true;
5032 /* The variable is being defined, so determine its
5034 determine_visibility (decl);
5036 /* If the variable has an array type, lay out the type, even if
5037 there is no initializer. It is valid to index through the
5038 array, and we must get TYPE_ALIGN set correctly on the array
5040 else if (TREE_CODE (type) == ARRAY_TYPE)
5044 /* Add this declaration to the statement-tree. This needs to happen
5045 after the call to check_initializer so that the DECL_EXPR for a
5046 reference temp is added before the DECL_EXPR for the reference itself. */
5047 if (at_function_scope_p ())
5048 add_decl_expr (decl);
5050 if (TREE_CODE (decl) == VAR_DECL)
5051 layout_var_decl (decl);
5053 /* Output the assembler code and/or RTL code for variables and functions,
5054 unless the type is an undefined structure or union.
5055 If not, it will get done when the type is completed. */
5056 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
5058 if (TREE_CODE (decl) == VAR_DECL)
5059 maybe_commonize_var (decl);
5061 make_rtl_for_nonlocal_decl (decl, init, asmspec);
5063 /* Check for abstractness of the type. Notice that there is no
5064 need to strip array types here since the check for those types
5065 is already done within create_array_type_for_decl. */
5066 if (TREE_CODE (type) == FUNCTION_TYPE
5067 || TREE_CODE (type) == METHOD_TYPE)
5068 abstract_virtuals_error (decl, TREE_TYPE (type));
5070 abstract_virtuals_error (decl, type);
5072 if (TREE_CODE (decl) == FUNCTION_DECL
5073 || TREE_TYPE (decl) == error_mark_node)
5074 /* No initialization required. */
5076 else if (DECL_EXTERNAL (decl)
5077 && ! (DECL_LANG_SPECIFIC (decl)
5078 && DECL_NOT_REALLY_EXTERN (decl)))
5081 DECL_INITIAL (decl) = init;
5085 /* A variable definition. */
5086 if (DECL_FUNCTION_SCOPE_P (decl))
5088 /* Initialize the local variable. */
5089 if (processing_template_decl)
5091 if (init || DECL_INITIAL (decl) == error_mark_node)
5092 DECL_INITIAL (decl) = init;
5094 else if (!TREE_STATIC (decl))
5095 initialize_local_var (decl, init);
5098 /* If a variable is defined, and then a subsequent
5099 definition with external linkage is encountered, we will
5100 get here twice for the same variable. We want to avoid
5101 calling expand_static_init more than once. For variables
5102 that are not static data members, we can call
5103 expand_static_init only when we actually process the
5104 initializer. It is not legal to redeclare a static data
5105 member, so this issue does not arise in that case. */
5106 if (var_definition_p && TREE_STATIC (decl))
5107 expand_static_init (decl, init);
5111 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
5112 reference, insert it in the statement-tree now. */
5114 push_cleanup (decl, cleanup, false);
5119 TREE_READONLY (decl) = 1;
5121 /* If this was marked 'used', be sure it will be output. */
5122 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
5123 mark_decl_referenced (decl);
5126 /* This is here for a midend callback from c-common.c. */
5129 finish_decl (tree decl, tree init, tree asmspec_tree)
5131 cp_finish_decl (decl, init, asmspec_tree, 0);
5134 /* Returns a declaration for a VAR_DECL as if:
5136 extern "C" TYPE NAME;
5138 had been seen. Used to create compiler-generated global
5142 declare_global_var (tree name, tree type)
5146 push_to_top_level ();
5147 decl = build_decl (VAR_DECL, name, type);
5148 TREE_PUBLIC (decl) = 1;
5149 DECL_EXTERNAL (decl) = 1;
5150 DECL_ARTIFICIAL (decl) = 1;
5151 /* If the user has explicitly declared this variable (perhaps
5152 because the code we are compiling is part of a low-level runtime
5153 library), then it is possible that our declaration will be merged
5154 with theirs by pushdecl. */
5155 decl = pushdecl (decl);
5156 cp_finish_decl (decl, NULL_TREE, NULL_TREE, 0);
5157 pop_from_top_level ();
5162 /* Returns a pointer to the `atexit' function. Note that if
5163 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
5164 `__cxa_atexit' function specified in the IA64 C++ ABI. */
5167 get_atexit_node (void)
5174 bool use_aeabi_atexit;
5179 if (flag_use_cxa_atexit)
5181 /* The declaration for `__cxa_atexit' is:
5183 int __cxa_atexit (void (*)(void *), void *, void *)
5185 We build up the argument types and then then function type
5188 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
5189 /* First, build the pointer-to-function type for the first
5191 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
5192 fn_type = build_function_type (void_type_node, arg_types);
5193 fn_ptr_type = build_pointer_type (fn_type);
5194 /* Then, build the rest of the argument types. */
5195 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
5196 if (use_aeabi_atexit)
5198 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
5199 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
5203 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
5204 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
5206 /* And the final __cxa_atexit type. */
5207 fn_type = build_function_type (integer_type_node, arg_types);
5208 fn_ptr_type = build_pointer_type (fn_type);
5209 if (use_aeabi_atexit)
5210 name = "__aeabi_atexit";
5212 name = "__cxa_atexit";
5216 /* The declaration for `atexit' is:
5218 int atexit (void (*)());
5220 We build up the argument types and then then function type
5222 fn_type = build_function_type (void_type_node, void_list_node);
5223 fn_ptr_type = build_pointer_type (fn_type);
5224 arg_types = tree_cons (NULL_TREE, fn_ptr_type, void_list_node);
5225 /* Build the final atexit type. */
5226 fn_type = build_function_type (integer_type_node, arg_types);
5230 /* Now, build the function declaration. */
5231 push_lang_context (lang_name_c);
5232 atexit_fndecl = build_library_fn_ptr (name, fn_type);
5233 mark_used (atexit_fndecl);
5234 pop_lang_context ();
5235 atexit_node = decay_conversion (atexit_fndecl);
5240 /* Returns the __dso_handle VAR_DECL. */
5243 get_dso_handle_node (void)
5245 if (dso_handle_node)
5246 return dso_handle_node;
5248 /* Declare the variable. */
5249 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
5252 return dso_handle_node;
5255 /* Begin a new function with internal linkage whose job will be simply
5256 to destroy some particular variable. */
5258 static GTY(()) int start_cleanup_cnt;
5261 start_cleanup_fn (void)
5268 push_to_top_level ();
5270 /* No need to mangle this. */
5271 push_lang_context (lang_name_c);
5273 /* Build the parameter-types. */
5274 parmtypes = void_list_node;
5275 /* Functions passed to __cxa_atexit take an additional parameter.
5276 We'll just ignore it. After we implement the new calling
5277 convention for destructors, we can eliminate the use of
5278 additional cleanup functions entirely in the -fnew-abi case. */
5279 if (flag_use_cxa_atexit)
5280 parmtypes = tree_cons (NULL_TREE, ptr_type_node, parmtypes);
5281 /* Build the function type itself. */
5282 fntype = build_function_type (void_type_node, parmtypes);
5283 /* Build the name of the function. */
5284 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
5285 /* Build the function declaration. */
5286 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
5287 /* It's a function with internal linkage, generated by the
5289 TREE_PUBLIC (fndecl) = 0;
5290 DECL_ARTIFICIAL (fndecl) = 1;
5291 /* Make the function `inline' so that it is only emitted if it is
5292 actually needed. It is unlikely that it will be inlined, since
5293 it is only called via a function pointer, but we avoid unnecessary
5294 emissions this way. */
5295 DECL_INLINE (fndecl) = 1;
5296 DECL_DECLARED_INLINE_P (fndecl) = 1;
5297 DECL_INTERFACE_KNOWN (fndecl) = 1;
5298 /* Build the parameter. */
5299 if (flag_use_cxa_atexit)
5303 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
5304 DECL_CONTEXT (parmdecl) = fndecl;
5305 TREE_USED (parmdecl) = 1;
5306 DECL_ARGUMENTS (fndecl) = parmdecl;
5310 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
5312 pop_lang_context ();
5314 return current_function_decl;
5317 /* Finish the cleanup function begun by start_cleanup_fn. */
5320 end_cleanup_fn (void)
5322 expand_or_defer_fn (finish_function (0));
5324 pop_from_top_level ();
5327 /* Generate code to handle the destruction of DECL, an object with
5328 static storage duration. */
5331 register_dtor_fn (tree decl)
5338 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
5339 return void_zero_node;
5341 /* Call build_cleanup before we enter the anonymous function so that
5342 any access checks will be done relative to the current scope,
5343 rather than the scope of the anonymous function. */
5344 build_cleanup (decl);
5346 /* Now start the function. */
5347 cleanup = start_cleanup_fn ();
5349 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
5350 to the original function, rather than the anonymous one. That
5351 will make the back-end think that nested functions are in use,
5352 which causes confusion. */
5354 push_deferring_access_checks (dk_no_check);
5355 fcall = build_cleanup (decl);
5356 pop_deferring_access_checks ();
5358 /* Create the body of the anonymous function. */
5359 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
5360 finish_expr_stmt (fcall);
5361 finish_compound_stmt (compound_stmt);
5364 /* Call atexit with the cleanup function. */
5365 cxx_mark_addressable (cleanup);
5366 mark_used (cleanup);
5367 cleanup = build_unary_op (ADDR_EXPR, cleanup, 0);
5368 if (flag_use_cxa_atexit)
5370 args = tree_cons (NULL_TREE,
5371 build_unary_op (ADDR_EXPR, get_dso_handle_node (), 0),
5373 if (targetm.cxx.use_aeabi_atexit ())
5375 args = tree_cons (NULL_TREE, cleanup, args);
5376 args = tree_cons (NULL_TREE, null_pointer_node, args);
5380 args = tree_cons (NULL_TREE, null_pointer_node, args);
5381 args = tree_cons (NULL_TREE, cleanup, args);
5385 args = tree_cons (NULL_TREE, cleanup, NULL_TREE);
5386 return build_function_call (get_atexit_node (), args);
5389 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
5390 is its initializer. Generate code to handle the construction
5391 and destruction of DECL. */
5394 expand_static_init (tree decl, tree init)
5396 gcc_assert (TREE_CODE (decl) == VAR_DECL);
5397 gcc_assert (TREE_STATIC (decl));
5399 /* Some variables require no initialization. */
5401 && !TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))
5402 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
5405 if (DECL_FUNCTION_SCOPE_P (decl))
5407 /* Emit code to perform this initialization but once. */
5408 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
5409 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
5410 tree guard, guard_addr, guard_addr_list;
5411 tree acquire_fn, release_fn, abort_fn;
5414 /* Emit code to perform this initialization but once. This code
5417 static <type> guard;
5418 if (!guard.first_byte) {
5419 if (__cxa_guard_acquire (&guard)) {
5422 // Do initialization.
5423 flag = true; __cxa_guard_release (&guard);
5424 // Register variable for destruction at end of program.
5426 if (!flag) __cxa_guard_abort (&guard);
5430 Note that the `flag' variable is only set to 1 *after* the
5431 initialization is complete. This ensures that an exception,
5432 thrown during the construction, will cause the variable to
5433 reinitialized when we pass through this code again, as per:
5437 If the initialization exits by throwing an exception, the
5438 initialization is not complete, so it will be tried again
5439 the next time control enters the declaration.
5441 This process should be thread-safe, too; multiple threads
5442 should not be able to initialize the variable more than
5445 /* Create the guard variable. */
5446 guard = get_guard (decl);
5448 /* This optimization isn't safe on targets with relaxed memory
5449 consistency. On such targets we force synchronization in
5450 __cxa_guard_acquire. */
5451 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
5453 /* Begin the conditional initialization. */
5454 if_stmt = begin_if_stmt ();
5455 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
5456 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
5459 if (flag_threadsafe_statics)
5461 guard_addr = build_address (guard);
5462 guard_addr_list = build_tree_list (NULL_TREE, guard_addr);
5464 acquire_fn = get_identifier ("__cxa_guard_acquire");
5465 release_fn = get_identifier ("__cxa_guard_release");
5466 abort_fn = get_identifier ("__cxa_guard_abort");
5467 if (!get_global_value_if_present (acquire_fn, &acquire_fn))
5469 tree argtypes = tree_cons (NULL_TREE, TREE_TYPE (guard_addr),
5471 tree vfntype = build_function_type (void_type_node, argtypes);
5472 acquire_fn = push_library_fn
5473 (acquire_fn, build_function_type (integer_type_node, argtypes));
5474 release_fn = push_library_fn (release_fn, vfntype);
5475 abort_fn = push_library_fn (abort_fn, vfntype);
5479 release_fn = identifier_global_value (release_fn);
5480 abort_fn = identifier_global_value (abort_fn);
5483 inner_if_stmt = begin_if_stmt ();
5484 finish_if_stmt_cond (build_call (acquire_fn, guard_addr_list),
5487 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
5488 begin = get_target_expr (boolean_false_node);
5489 flag = TARGET_EXPR_SLOT (begin);
5491 TARGET_EXPR_CLEANUP (begin)
5492 = build3 (COND_EXPR, void_type_node, flag,
5494 build_call (abort_fn, guard_addr_list));
5495 CLEANUP_EH_ONLY (begin) = 1;
5497 /* Do the initialization itself. */
5498 init = add_stmt_to_compound (begin, init);
5499 init = add_stmt_to_compound
5500 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
5501 init = add_stmt_to_compound
5502 (init, build_call (release_fn, guard_addr_list));
5505 init = add_stmt_to_compound (init, set_guard (guard));
5507 /* Use atexit to register a function for destroying this static
5509 init = add_stmt_to_compound (init, register_dtor_fn (decl));
5511 finish_expr_stmt (init);
5513 if (flag_threadsafe_statics)
5515 finish_compound_stmt (inner_then_clause);
5516 finish_then_clause (inner_if_stmt);
5517 finish_if_stmt (inner_if_stmt);
5520 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
5522 finish_compound_stmt (then_clause);
5523 finish_then_clause (if_stmt);
5524 finish_if_stmt (if_stmt);
5528 static_aggregates = tree_cons (init, decl, static_aggregates);
5532 /* Make TYPE a complete type based on INITIAL_VALUE.
5533 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
5534 2 if there was no information (in which case assume 0 if DO_DEFAULT),
5535 3 if the initializer list is empty (in pedantic mode). */
5538 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
5541 tree type, elt_type;
5545 /* An array of character type can be initialized from a
5546 brace-enclosed string constant.
5548 FIXME: this code is duplicated from reshape_init. Probably
5549 we should just call reshape_init here? */
5550 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
5551 && TREE_CODE (initial_value) == CONSTRUCTOR
5552 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
5554 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
5555 tree value = VEC_index (constructor_elt, v, 0)->value;
5557 if (TREE_CODE (value) == STRING_CST
5558 && VEC_length (constructor_elt, v) == 1)
5559 initial_value = value;
5563 failure = complete_array_type (ptype, initial_value, do_default);
5565 /* We can create the array before the element type is complete, which
5566 means that we didn't have these two bits set in the original type
5567 either. In completing the type, we are expected to propagate these
5568 bits. See also complete_type which does the same thing for arrays
5571 if (TYPE_DOMAIN (type))
5573 elt_type = TREE_TYPE (type);
5574 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
5575 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
5576 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
5582 /* Return zero if something is declared to be a member of type
5583 CTYPE when in the context of CUR_TYPE. STRING is the error
5584 message to print in that case. Otherwise, quietly return 1. */
5587 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
5589 if (ctype && ctype != cur_type)
5591 if (flags == DTOR_FLAG)
5592 error ("destructor for alien class %qT cannot be a member", ctype);
5594 error ("constructor for alien class %qT cannot be a member", ctype);
5600 /* Subroutine of `grokdeclarator'. */
5602 /* Generate errors possibly applicable for a given set of specifiers.
5603 This is for ARM $7.1.2. */
5606 bad_specifiers (tree object,
5615 error ("%qD declared as a %<virtual%> %s", object, type);
5617 error ("%qD declared as an %<inline%> %s", object, type);
5619 error ("%<const%> and %<volatile%> function specifiers on "
5620 "%qD invalid in %s declaration",
5623 error ("%q+D declared as a friend", object);
5625 && (TREE_CODE (object) == TYPE_DECL
5626 || (!TYPE_PTRFN_P (TREE_TYPE (object))
5627 && !TYPE_REFFN_P (TREE_TYPE (object))
5628 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
5629 error ("%q+D declared with an exception specification", object);
5632 /* DECL is a member function or static data member and is presently
5633 being defined. Check that the definition is taking place in a
5637 check_class_member_definition_namespace (tree decl)
5639 /* These checks only apply to member functions and static data
5641 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
5642 || TREE_CODE (decl) == VAR_DECL);
5643 /* We check for problems with specializations in pt.c in
5644 check_specialization_namespace, where we can issue better
5646 if (processing_specialization)
5648 /* There are no restrictions on the placement of
5649 explicit instantiations. */
5650 if (processing_explicit_instantiation)
5654 A member function definition that appears outside of the
5655 class definition shall appear in a namespace scope enclosing
5656 the class definition.
5660 The definition for a static data member shall appear in a
5661 namespace scope enclosing the member's class definition. */
5662 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
5663 pedwarn ("definition of %qD is not in namespace enclosing %qT",
5664 decl, DECL_CONTEXT (decl));
5667 /* CTYPE is class type, or null if non-class.
5668 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
5670 DECLARATOR is the function's name.
5671 PARMS is a chain of PARM_DECLs for the function.
5672 VIRTUALP is truthvalue of whether the function is virtual or not.
5673 FLAGS are to be passed through to `grokclassfn'.
5674 QUALS are qualifiers indicating whether the function is `const'
5676 RAISES is a list of exceptions that this function can raise.
5677 CHECK is 1 if we must find this method in CTYPE, 0 if we should
5678 not look, and -1 if we should not call `grokclassfn' at all.
5680 SFK is the kind of special function (if any) for the new function.
5682 Returns `NULL_TREE' if something goes wrong, after issuing
5683 applicable error messages. */
5686 grokfndecl (tree ctype,
5690 tree orig_declarator,
5692 enum overload_flags flags,
5699 special_function_kind sfk,
5706 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
5710 type = build_exception_variant (type, raises);
5712 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
5713 DECL_ARGUMENTS (decl) = parms;
5714 /* Propagate volatile out from type to decl. */
5715 if (TYPE_VOLATILE (type))
5716 TREE_THIS_VOLATILE (decl) = 1;
5719 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
5723 ("defining explicit specialization %qD in friend declaration",
5727 tree fns = TREE_OPERAND (orig_declarator, 0);
5728 tree args = TREE_OPERAND (orig_declarator, 1);
5730 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
5732 /* Something like `template <class T> friend void f<T>()'. */
5733 error ("invalid use of template-id %qD in declaration "
5734 "of primary template",
5740 /* A friend declaration of the form friend void f<>(). Record
5741 the information in the TEMPLATE_ID_EXPR. */
5742 SET_DECL_IMPLICIT_INSTANTIATION (decl);
5744 if (TREE_CODE (fns) == COMPONENT_REF)
5746 /* Due to bison parser ickiness, we will have already looked
5747 up an operator_name or PFUNCNAME within the current class
5748 (see template_id in parse.y). If the current class contains
5749 such a name, we'll get a COMPONENT_REF here. Undo that. */
5751 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
5752 == current_class_type);
5753 fns = TREE_OPERAND (fns, 1);
5755 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
5756 || TREE_CODE (fns) == OVERLOAD);
5757 DECL_TEMPLATE_INFO (decl) = tree_cons (fns, args, NULL_TREE);
5759 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
5760 if (TREE_PURPOSE (t)
5761 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
5763 error ("default arguments are not allowed in declaration "
5764 "of friend template specialization %qD",
5771 error ("%<inline%> is not allowed in declaration of friend "
5772 "template specialization %qD",
5779 /* If this decl has namespace scope, set that up. */
5781 set_decl_namespace (decl, in_namespace, friendp);
5783 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
5785 /* `main' and builtins have implicit 'C' linkage. */
5786 if ((MAIN_NAME_P (declarator)
5787 || (IDENTIFIER_LENGTH (declarator) > 10
5788 && IDENTIFIER_POINTER (declarator)[0] == '_'
5789 && IDENTIFIER_POINTER (declarator)[1] == '_'
5790 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
5791 && current_lang_name == lang_name_cplusplus
5792 && ctype == NULL_TREE
5793 /* NULL_TREE means global namespace. */
5794 && DECL_CONTEXT (decl) == NULL_TREE)
5795 SET_DECL_LANGUAGE (decl, lang_c);
5797 /* Should probably propagate const out from type to decl I bet (mrs). */
5800 DECL_STATIC_FUNCTION_P (decl) = 1;
5801 DECL_CONTEXT (decl) = ctype;
5806 DECL_CONTEXT (decl) = ctype;
5808 check_class_member_definition_namespace (decl);
5811 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
5813 if (processing_template_decl)
5814 error ("cannot declare %<::main%> to be a template");
5816 error ("cannot declare %<::main%> to be inline");
5818 error ("cannot declare %<::main%> to be static");
5819 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
5822 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
5824 error ("%<::main%> must return %<int%>");
5825 newtype = build_function_type (integer_type_node,
5827 TREE_TYPE (decl) = newtype;
5833 /* Members of anonymous types and local classes have no linkage; make
5834 them internal. If a typedef is made later, this will be changed. */
5835 if (ctype && (TYPE_ANONYMOUS_P (ctype)
5836 || decl_function_context (TYPE_MAIN_DECL (ctype))))
5841 /* [basic.link]: A name with no linkage (notably, the name of a class
5842 or enumeration declared in a local scope) shall not be used to
5843 declare an entity with linkage.
5845 Only check this for public decls for now. See core 319, 389. */
5846 t = no_linkage_check (TREE_TYPE (decl),
5847 /*relaxed_p=*/false);
5850 if (TYPE_ANONYMOUS_P (t))
5852 if (DECL_EXTERN_C_P (decl))
5853 /* Allow this; it's pretty common in C. */;
5856 pedwarn ("non-local function %q#D uses anonymous type",
5858 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
5859 pedwarn ("%q+#D does not refer to the unqualified "
5860 "type, so it is not used for linkage",
5865 pedwarn ("non-local function %q#D uses local type %qT", decl, t);
5869 TREE_PUBLIC (decl) = publicp;
5872 DECL_INTERFACE_KNOWN (decl) = 1;
5873 DECL_NOT_REALLY_EXTERN (decl) = 1;
5876 /* If the declaration was declared inline, mark it as such. */
5878 DECL_DECLARED_INLINE_P (decl) = 1;
5879 /* We inline functions that are explicitly declared inline, or, when
5880 the user explicitly asks us to, all functions. */
5881 if (DECL_DECLARED_INLINE_P (decl)
5882 || (flag_inline_trees == 2 && !DECL_INLINE (decl) && funcdef_flag))
5883 DECL_INLINE (decl) = 1;
5885 DECL_EXTERNAL (decl) = 1;
5886 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
5888 error ("%smember function %qD cannot have cv-qualifier",
5889 (ctype ? "static " : "non-"), decl);
5890 quals = TYPE_UNQUALIFIED;
5893 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl)))
5894 grok_op_properties (decl, /*complain=*/true);
5896 if (ctype && decl_function_context (decl))
5897 DECL_NO_STATIC_CHAIN (decl) = 1;
5900 /* Make the init_value nonzero so pushdecl knows this is not
5901 tentative. error_mark_node is replaced later with the BLOCK. */
5902 DECL_INITIAL (decl) = error_mark_node;
5904 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
5905 TREE_NOTHROW (decl) = 1;
5907 /* Caller will do the rest of this. */
5911 if (ctype != NULL_TREE)
5913 if (sfk == sfk_constructor)
5914 DECL_CONSTRUCTOR_P (decl) = 1;
5916 grokclassfn (ctype, decl, flags, quals);
5919 decl = check_explicit_specialization (orig_declarator, decl,
5922 4 * (friendp != 0));
5923 if (decl == error_mark_node)
5928 cplus_decl_attributes (&decl, *attrlist, 0);
5929 *attrlist = NULL_TREE;
5932 if (ctype != NULL_TREE
5933 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
5938 old_decl = check_classfn (ctype, decl,
5939 (processing_template_decl
5940 > template_class_depth (ctype))
5941 ? current_template_parms
5948 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
5949 /* Because grokfndecl is always supposed to return a
5950 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
5951 here. We depend on our callers to figure out that its
5952 really a template that's being returned. */
5953 old_decl = DECL_TEMPLATE_RESULT (old_decl);
5955 if (DECL_STATIC_FUNCTION_P (old_decl)
5956 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
5957 /* Remove the `this' parm added by grokclassfn.
5958 XXX Isn't this done in start_function, too? */
5959 revert_static_member_fn (decl);
5960 if (DECL_ARTIFICIAL (old_decl))
5961 error ("definition of implicitly-declared %qD", old_decl);
5963 /* Since we've smashed OLD_DECL to its
5964 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
5965 if (TREE_CODE (decl) == TEMPLATE_DECL)
5966 decl = DECL_TEMPLATE_RESULT (decl);
5968 /* Attempt to merge the declarations. This can fail, in
5969 the case of some invalid specialization declarations. */
5970 pushed_scope = push_scope (ctype);
5971 ok = duplicate_decls (decl, old_decl, friendp);
5973 pop_scope (pushed_scope);
5976 error ("no %q#D member function declared in class %qT",
5984 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
5987 if (ctype == NULL_TREE || check)
5991 DECL_VIRTUAL_P (decl) = 1;
5996 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
5997 the linkage that DECL will receive in the object file. */
6000 set_linkage_for_static_data_member (tree decl)
6002 /* A static data member always has static storage duration and
6003 external linkage. Note that static data members are forbidden in
6004 local classes -- the only situation in which a class has
6005 non-external linkage. */
6006 TREE_PUBLIC (decl) = 1;
6007 TREE_STATIC (decl) = 1;
6008 /* For non-template classes, static data members are always put
6009 out in exactly those files where they are defined, just as
6010 with ordinary namespace-scope variables. */
6011 if (!processing_template_decl)
6012 DECL_INTERFACE_KNOWN (decl) = 1;
6015 /* Create a VAR_DECL named NAME with the indicated TYPE.
6017 If SCOPE is non-NULL, it is the class type or namespace containing
6018 the variable. If SCOPE is NULL, the variable should is created in
6019 the innermost enclosings scope. */
6022 grokvardecl (tree type,
6024 const cp_decl_specifier_seq *declspecs,
6030 tree explicit_scope;
6032 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
6034 /* Compute the scope in which to place the variable, but remember
6035 whether or not that scope was explicitly specified by the user. */
6036 explicit_scope = scope;
6039 /* An explicit "extern" specifier indicates a namespace-scope
6041 if (declspecs->storage_class == sc_extern)
6042 scope = current_namespace;
6043 else if (!at_function_scope_p ())
6044 scope = current_scope ();
6048 && (/* If the variable is a namespace-scope variable declared in a
6049 template, we need DECL_LANG_SPECIFIC. */
6050 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
6051 /* Similarly for namespace-scope variables with language linkage
6053 || (TREE_CODE (scope) == NAMESPACE_DECL
6054 && current_lang_name != lang_name_cplusplus)
6055 /* Similarly for static data members. */
6057 decl = build_lang_decl (VAR_DECL, name, type);
6059 decl = build_decl (VAR_DECL, name, type);
6061 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
6062 set_decl_namespace (decl, explicit_scope, 0);
6064 DECL_CONTEXT (decl) = scope;
6066 if (declspecs->storage_class == sc_extern)
6068 DECL_THIS_EXTERN (decl) = 1;
6069 DECL_EXTERNAL (decl) = !initialized;
6072 if (DECL_CLASS_SCOPE_P (decl))
6074 set_linkage_for_static_data_member (decl);
6075 /* This function is only called with out-of-class definitions. */
6076 DECL_EXTERNAL (decl) = 0;
6077 check_class_member_definition_namespace (decl);
6079 /* At top level, either `static' or no s.c. makes a definition
6080 (perhaps tentative), and absence of `static' makes it public. */
6081 else if (toplevel_bindings_p ())
6083 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
6084 && (DECL_THIS_EXTERN (decl) || ! constp));
6085 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
6087 /* Not at top level, only `static' makes a static definition. */
6090 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
6091 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
6094 if (declspecs->specs[(int)ds_thread])
6096 if (targetm.have_tls)
6097 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
6099 /* A mere warning is sure to result in improper semantics
6100 at runtime. Don't bother to allow this to compile. */
6101 error ("thread-local storage not supported for this target");
6104 if (TREE_PUBLIC (decl))
6106 /* [basic.link]: A name with no linkage (notably, the name of a class
6107 or enumeration declared in a local scope) shall not be used to
6108 declare an entity with linkage.
6110 Only check this for public decls for now. */
6111 tree t = no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false);
6114 if (TYPE_ANONYMOUS_P (t))
6116 if (DECL_EXTERN_C_P (decl))
6117 /* Allow this; it's pretty common in C. */
6121 /* DRs 132, 319 and 389 seem to indicate types with
6122 no linkage can only be used to declare extern "C"
6123 entities. Since it's not always an error in the
6124 ISO C++ 90 Standard, we only issue a warning. */
6125 warning (0, "non-local variable %q#D uses anonymous type",
6127 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
6128 warning (0, "%q+#D does not refer to the unqualified "
6129 "type, so it is not used for linkage",
6134 warning (0, "non-local variable %q#D uses local type %qT", decl, t);
6138 DECL_INTERFACE_KNOWN (decl) = 1;
6143 /* Create and return a canonical pointer to member function type, for
6144 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
6147 build_ptrmemfunc_type (tree type)
6151 tree unqualified_variant = NULL_TREE;
6153 if (type == error_mark_node)
6156 /* If a canonical type already exists for this type, use it. We use
6157 this method instead of type_hash_canon, because it only does a
6158 simple equality check on the list of field members. */
6160 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
6163 /* Make sure that we always have the unqualified pointer-to-member
6165 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
6167 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
6169 t = make_aggr_type (RECORD_TYPE);
6170 xref_basetypes (t, NULL_TREE);
6172 /* Let the front-end know this is a pointer to member function... */
6173 TYPE_PTRMEMFUNC_FLAG (t) = 1;
6174 /* ... and not really an aggregate. */
6175 SET_IS_AGGR_TYPE (t, 0);
6177 field = build_decl (FIELD_DECL, pfn_identifier, type);
6180 field = build_decl (FIELD_DECL, delta_identifier, delta_type_node);
6181 TREE_CHAIN (field) = fields;
6184 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
6186 /* Zap out the name so that the back-end will give us the debugging
6187 information for this anonymous RECORD_TYPE. */
6188 TYPE_NAME (t) = NULL_TREE;
6190 /* If this is not the unqualified form of this pointer-to-member
6191 type, set the TYPE_MAIN_VARIANT for this type to be the
6192 unqualified type. Since they are actually RECORD_TYPEs that are
6193 not variants of each other, we must do this manually. */
6194 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
6196 t = build_qualified_type (t, cp_type_quals (type));
6197 TYPE_MAIN_VARIANT (t) = unqualified_variant;
6198 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
6199 TYPE_NEXT_VARIANT (unqualified_variant) = t;
6202 /* Cache this pointer-to-member type so that we can find it again
6204 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
6209 /* Create and return a pointer to data member type. */
6212 build_ptrmem_type (tree class_type, tree member_type)
6214 if (TREE_CODE (member_type) == METHOD_TYPE)
6218 arg_types = TYPE_ARG_TYPES (member_type);
6219 class_type = (cp_build_qualified_type
6221 cp_type_quals (TREE_TYPE (TREE_VALUE (arg_types)))));
6223 = build_method_type_directly (class_type,
6224 TREE_TYPE (member_type),
6225 TREE_CHAIN (arg_types));
6226 return build_ptrmemfunc_type (build_pointer_type (member_type));
6230 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
6231 return build_offset_type (class_type, member_type);
6235 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
6236 Check to see that the definition is valid. Issue appropriate error
6237 messages. Return 1 if the definition is particularly bad, or 0
6241 check_static_variable_definition (tree decl, tree type)
6243 /* Motion 10 at San Diego: If a static const integral data member is
6244 initialized with an integral constant expression, the initializer
6245 may appear either in the declaration (within the class), or in
6246 the definition, but not both. If it appears in the class, the
6247 member is a member constant. The file-scope definition is always
6249 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
6251 error ("invalid in-class initialization of static data member "
6252 "of non-integral type %qT",
6254 /* If we just return the declaration, crashes will sometimes
6255 occur. We therefore return void_type_node, as if this were a
6256 friend declaration, to cause callers to completely ignore
6257 this declaration. */
6260 else if (!CP_TYPE_CONST_P (type))
6261 error ("ISO C++ forbids in-class initialization of non-const "
6262 "static member %qD",
6264 else if (pedantic && !INTEGRAL_TYPE_P (type))
6265 pedwarn ("ISO C++ forbids initialization of member constant "
6266 "%qD of non-integral type %qT", decl, type);
6271 /* Given the SIZE (i.e., number of elements) in an array, compute an
6272 appropriate index type for the array. If non-NULL, NAME is the
6273 name of the thing being declared. */
6276 compute_array_index_type (tree name, tree size)
6278 tree type = TREE_TYPE (size);
6281 /* The array bound must be an integer type. */
6282 if (!dependent_type_p (type) && !INTEGRAL_TYPE_P (type))
6285 error ("size of array %qD has non-integral type %qT", name, type);
6287 error ("size of array has non-integral type %qT", type);
6288 size = integer_one_node;
6289 type = TREE_TYPE (size);
6292 if (abi_version_at_least (2)
6293 /* We should only handle value dependent expressions specially. */
6294 ? value_dependent_expression_p (size)
6295 /* But for abi-1, we handled all instances in templates. This
6296 effects the manglings produced. */
6297 : processing_template_decl)
6298 return build_index_type (build_min (MINUS_EXPR, sizetype,
6299 size, integer_one_node));
6301 /* The size might be the result of a cast. */
6302 STRIP_TYPE_NOPS (size);
6304 /* It might be a const variable or enumeration constant. */
6305 size = integral_constant_value (size);
6307 /* Normally, the array-bound will be a constant. */
6308 if (TREE_CODE (size) == INTEGER_CST)
6310 /* Check to see if the array bound overflowed. Make that an
6311 error, no matter how generous we're being. */
6312 int old_flag_pedantic_errors = flag_pedantic_errors;
6313 int old_pedantic = pedantic;
6314 pedantic = flag_pedantic_errors = 1;
6315 constant_expression_warning (size);
6316 pedantic = old_pedantic;
6317 flag_pedantic_errors = old_flag_pedantic_errors;
6319 /* An array must have a positive number of elements. */
6320 if (INT_CST_LT (size, integer_zero_node))
6323 error ("size of array %qD is negative", name);
6325 error ("size of array is negative");
6326 size = integer_one_node;
6328 /* As an extension we allow zero-sized arrays. We always allow
6329 them in system headers because glibc uses them. */
6330 else if (integer_zerop (size) && pedantic && !in_system_header)
6333 pedwarn ("ISO C++ forbids zero-size array %qD", name);
6335 pedwarn ("ISO C++ forbids zero-size array");
6338 else if (TREE_CONSTANT (size))
6340 /* `(int) &fn' is not a valid array bound. */
6342 error ("size of array %qD is not an integral constant-expression",
6345 error ("size of array is not an integral constant-expression");
6346 size = integer_one_node;
6351 pedwarn ("ISO C++ forbids variable-size array %qD", name);
6353 pedwarn ("ISO C++ forbids variable-size array");
6356 if (processing_template_decl && !TREE_CONSTANT (size))
6357 /* A variable sized array. */
6358 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
6361 HOST_WIDE_INT saved_processing_template_decl;
6363 /* Compute the index of the largest element in the array. It is
6364 one less than the number of elements in the array. We save
6365 and restore PROCESSING_TEMPLATE_DECL so that computations in
6366 cp_build_binary_op will be appropriately folded. */
6367 saved_processing_template_decl = processing_template_decl;
6368 processing_template_decl = 0;
6369 itype = cp_build_binary_op (MINUS_EXPR,
6370 cp_convert (ssizetype, size),
6371 cp_convert (ssizetype, integer_one_node));
6372 itype = fold (itype);
6373 processing_template_decl = saved_processing_template_decl;
6375 if (!TREE_CONSTANT (itype))
6376 /* A variable sized array. */
6377 itype = variable_size (itype);
6378 /* Make sure that there was no overflow when creating to a signed
6379 index type. (For example, on a 32-bit machine, an array with
6380 size 2^32 - 1 is too big.) */
6381 else if (TREE_CODE (itype) == INTEGER_CST
6382 && TREE_OVERFLOW (itype))
6384 error ("overflow in array dimension");
6385 TREE_OVERFLOW (itype) = 0;
6389 /* Create and return the appropriate index type. */
6390 return build_index_type (itype);
6393 /* Returns the scope (if any) in which the entity declared by
6394 DECLARATOR will be located. If the entity was declared with an
6395 unqualified name, NULL_TREE is returned. */
6398 get_scope_of_declarator (const cp_declarator *declarator)
6400 while (declarator && declarator->kind != cdk_id)
6401 declarator = declarator->declarator;
6403 /* If the declarator-id is a SCOPE_REF, the scope in which the
6404 declaration occurs is the first operand. */
6406 && declarator->u.id.qualifying_scope)
6407 return declarator->u.id.qualifying_scope;
6409 /* Otherwise, the declarator is not a qualified name; the entity will
6410 be declared in the current scope. */
6414 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
6415 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
6419 create_array_type_for_decl (tree name, tree type, tree size)
6421 tree itype = NULL_TREE;
6422 const char* error_msg;
6424 /* If things have already gone awry, bail now. */
6425 if (type == error_mark_node || size == error_mark_node)
6426 return error_mark_node;
6428 /* Assume that everything will go OK. */
6431 /* There are some types which cannot be array elements. */
6432 switch (TREE_CODE (type))
6435 error_msg = "array of void";
6439 error_msg = "array of functions";
6442 case REFERENCE_TYPE:
6443 error_msg = "array of references";
6447 error_msg = "array of function members";
6454 /* If something went wrong, issue an error-message and return. */
6458 error ("declaration of %qD as %s", name, error_msg);
6460 error ("creating %s", error_msg);
6462 return error_mark_node;
6467 The constant expressions that specify the bounds of the arrays
6468 can be omitted only for the first member of the sequence. */
6469 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
6472 error ("declaration of %qD as multidimensional array must "
6473 "have bounds for all dimensions except the first",
6476 error ("multidimensional array must have bounds for all "
6477 "dimensions except the first");
6479 return error_mark_node;
6482 /* Figure out the index type for the array. */
6484 itype = compute_array_index_type (name, size);
6487 T is called the array element type; this type shall not be [...] an
6488 abstract class type. */
6489 abstract_virtuals_error (name, type);
6491 return build_cplus_array_type (type, itype);
6494 /* Check that it's OK to declare a function with the indicated TYPE.
6495 SFK indicates the kind of special function (if any) that this
6496 function is. OPTYPE is the type given in a conversion operator
6497 declaration, or the class type for a constructor/destructor.
6498 Returns the actual return type of the function; that
6499 may be different than TYPE if an error occurs, or for certain
6500 special functions. */
6503 check_special_function_return_type (special_function_kind sfk,
6509 case sfk_constructor:
6511 error ("return type specification for constructor invalid");
6513 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
6514 type = build_pointer_type (optype);
6516 type = void_type_node;
6519 case sfk_destructor:
6521 error ("return type specification for destructor invalid");
6522 /* We can't use the proper return type here because we run into
6523 problems with ambiguous bases and covariant returns.
6524 Java classes are left unchanged because (void *) isn't a valid
6525 Java type, and we don't want to change the Java ABI. */
6526 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
6527 type = build_pointer_type (void_type_node);
6529 type = void_type_node;
6532 case sfk_conversion:
6533 if (type && !same_type_p (type, optype))
6534 error ("operator %qT declared to return %qT", optype, type);
6536 pedwarn ("return type specified for %<operator %T%>", optype);
6547 /* A variable or data member (whose unqualified name is IDENTIFIER)
6548 has been declared with the indicated TYPE. If the TYPE is not
6549 acceptable, issue an error message and return a type to use for
6550 error-recovery purposes. */
6553 check_var_type (tree identifier, tree type)
6555 if (VOID_TYPE_P (type))
6558 error ("unnamed variable or field declared void");
6559 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
6561 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
6562 error ("variable or field %qE declared void", identifier);
6565 error ("variable or field declared void");
6566 type = integer_type_node;
6572 /* Given declspecs and a declarator (abstract or otherwise), determine
6573 the name and type of the object declared and construct a DECL node
6576 DECLSPECS is a chain of tree_list nodes whose value fields
6577 are the storage classes and type specifiers.
6579 DECL_CONTEXT says which syntactic context this declaration is in:
6580 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
6581 FUNCDEF for a function definition. Like NORMAL but a few different
6582 error messages in each case. Return value may be zero meaning
6583 this definition is too screwy to try to parse.
6584 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
6585 handle member functions (which have FIELD context).
6586 Return value may be zero meaning this definition is too screwy to
6588 PARM for a parameter declaration (either within a function prototype
6589 or before a function body). Make a PARM_DECL, or return void_type_node.
6590 CATCHPARM for a parameter declaration before a catch clause.
6591 TYPENAME if for a typename (in a cast or sizeof).
6592 Don't make a DECL node; just return the ..._TYPE node.
6593 FIELD for a struct or union field; make a FIELD_DECL.
6594 BITFIELD for a field with specified width.
6595 INITIALIZED is 1 if the decl has an initializer.
6597 ATTRLIST is a pointer to the list of attributes, which may be NULL
6598 if there are none; *ATTRLIST may be modified if attributes from inside
6599 the declarator should be applied to the declaration.
6601 When this function is called, scoping variables (such as
6602 CURRENT_CLASS_TYPE) should reflect the scope in which the
6603 declaration occurs, not the scope in which the new declaration will
6604 be placed. For example, on:
6608 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
6609 should not be `S'. */
6612 grokdeclarator (const cp_declarator *declarator,
6613 const cp_decl_specifier_seq *declspecs,
6614 enum decl_context decl_context,
6618 tree type = NULL_TREE;
6621 int virtualp, explicitp, friendp, inlinep, staticp;
6622 int explicit_int = 0;
6623 int explicit_char = 0;
6624 int defaulted_int = 0;
6625 tree dependant_name = NULL_TREE;
6627 tree typedef_decl = NULL_TREE;
6628 const char *name = NULL;
6629 tree typedef_type = NULL_TREE;
6630 /* True if this declarator is a function definition. */
6631 bool funcdef_flag = false;
6632 cp_declarator_kind innermost_code = cdk_error;
6635 /* See the code below that used this. */
6636 tree decl_attr = NULL_TREE;
6639 /* Keep track of what sort of function is being processed
6640 so that we can warn about default return values, or explicit
6641 return values which do not match prescribed defaults. */
6642 special_function_kind sfk = sfk_none;
6644 tree dname = NULL_TREE;
6645 tree ctor_return_type = NULL_TREE;
6646 enum overload_flags flags = NO_SPECIAL;
6647 cp_cv_quals quals = TYPE_UNQUALIFIED;
6648 tree raises = NULL_TREE;
6649 int template_count = 0;
6650 tree returned_attrs = NULL_TREE;
6651 tree parms = NULL_TREE;
6652 const cp_declarator *id_declarator;
6653 /* The unqualified name of the declarator; either an
6654 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
6655 tree unqualified_id;
6656 /* The class type, if any, in which this entity is located,
6657 or NULL_TREE if none. Note that this value may be different from
6658 the current class type; for example if an attempt is made to declare
6659 "A::f" inside "B", this value will be "A". */
6660 tree ctype = current_class_type;
6661 /* The NAMESPACE_DECL for the namespace in which this entity is
6662 located. If an unqualified name is used to declare the entity,
6663 this value will be NULL_TREE, even if the entity is located at
6665 tree in_namespace = NULL_TREE;
6667 cp_storage_class storage_class;
6668 bool unsigned_p, signed_p, short_p, long_p, thread_p;
6669 bool type_was_error_mark_node = false;
6671 signed_p = declspecs->specs[(int)ds_signed];
6672 unsigned_p = declspecs->specs[(int)ds_unsigned];
6673 short_p = declspecs->specs[(int)ds_short];
6674 long_p = declspecs->specs[(int)ds_long];
6675 thread_p = declspecs->specs[(int)ds_thread];
6677 if (decl_context == FUNCDEF)
6678 funcdef_flag = true, decl_context = NORMAL;
6679 else if (decl_context == MEMFUNCDEF)
6680 funcdef_flag = true, decl_context = FIELD;
6681 else if (decl_context == BITFIELD)
6682 bitfield = 1, decl_context = FIELD;
6684 /* Look inside a declarator for the name being declared
6685 and get it as a string, for an error message. */
6686 for (id_declarator = declarator;
6688 id_declarator = id_declarator->declarator)
6690 if (id_declarator->kind != cdk_id)
6691 innermost_code = id_declarator->kind;
6693 switch (id_declarator->kind)
6696 if (id_declarator->declarator
6697 && id_declarator->declarator->kind == cdk_id)
6699 sfk = id_declarator->declarator->u.id.sfk;
6700 if (sfk == sfk_destructor)
6707 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
6708 tree decl = id_declarator->u.id.unqualified_name;
6711 if (qualifying_scope)
6713 if (TYPE_P (qualifying_scope))
6715 ctype = qualifying_scope;
6716 if (innermost_code != cdk_function
6717 && current_class_type
6718 && !UNIQUELY_DERIVED_FROM_P (ctype,
6719 current_class_type))
6721 error ("type %qT is not derived from type %qT",
6722 ctype, current_class_type);
6723 return error_mark_node;
6726 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
6727 in_namespace = qualifying_scope;
6729 switch (TREE_CODE (decl))
6735 if (innermost_code != cdk_function)
6737 error ("declaration of %qD as non-function", decl);
6738 return error_mark_node;
6740 else if (!qualifying_scope
6741 && !(current_class_type && at_class_scope_p ()))
6743 error ("declaration of %qD as non-member", decl);
6744 return error_mark_node;
6747 type = TREE_OPERAND (decl, 0);
6748 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;
6887 /* Check for repeated decl-specifiers. */
6888 for (ds = ds_first; ds != ds_last; ++ds)
6890 unsigned count = declspecs->specs[(int)ds];
6893 /* The "long" specifier is a special case because of
6898 error ("%<long long long%> is too long for GCC");
6899 else if (pedantic && !in_system_header && warn_long_long)
6900 pedwarn ("ISO C++ does not support %<long long%>");
6904 else if (declspecs->specs[(int)ds] > 1)
6906 static const char *const decl_spec_names[] = {
6922 error ("duplicate %qs", decl_spec_names[(int)ds]);
6927 /* See the code below that used this. */
6929 decl_attr = DECL_ATTRIBUTES (typedef_decl);
6931 typedef_type = type;
6934 if (sfk != sfk_conversion)
6935 ctor_return_type = ctype;
6937 if (sfk != sfk_none)
6938 type = check_special_function_return_type (sfk, type,
6940 else if (type == NULL_TREE)
6946 /* We handle `main' specially here, because 'main () { }' is so
6947 common. With no options, it is allowed. With -Wreturn-type,
6948 it is a warning. It is only an error with -pedantic-errors. */
6949 is_main = (funcdef_flag
6950 && dname && MAIN_NAME_P (dname)
6951 && ctype == NULL_TREE
6952 && in_namespace == NULL_TREE
6953 && current_namespace == global_namespace);
6955 if (type_was_error_mark_node)
6956 /* We've already issued an error, don't complain more. */;
6957 else if (in_system_header || flag_ms_extensions)
6958 /* Allow it, sigh. */;
6959 else if (pedantic || ! is_main)
6960 pedwarn ("ISO C++ forbids declaration of %qs with no type", name);
6961 else if (warn_return_type)
6962 warning (0, "ISO C++ forbids declaration of %qs with no type", name);
6964 type = integer_type_node;
6969 /* Now process the modifiers that were specified
6970 and check for invalid combinations. */
6972 /* Long double is a special combination. */
6973 if (long_p && TYPE_MAIN_VARIANT (type) == double_type_node)
6976 type = build_qualified_type (long_double_type_node,
6977 cp_type_quals (type));
6980 /* Check all other uses of type modifiers. */
6982 if (unsigned_p || signed_p || long_p || short_p)
6986 if (TREE_CODE (type) == REAL_TYPE)
6987 error ("short, signed or unsigned invalid for %qs", name);
6988 else if (TREE_CODE (type) != INTEGER_TYPE)
6989 error ("long, short, signed or unsigned invalid for %qs", name);
6990 else if (long_p && short_p)
6991 error ("long and short specified together for %qs", name);
6992 else if ((long_p || short_p) && explicit_char)
6993 error ("long or short specified with char for %qs", name);
6994 else if ((long_p|| short_p) && TREE_CODE (type) == REAL_TYPE)
6995 error ("long or short specified with floating type for %qs", name);
6996 else if (signed_p && unsigned_p)
6997 error ("signed and unsigned given together for %qs", name);
7001 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
7003 pedwarn ("long, short, signed or unsigned used invalidly for %qs",
7005 if (flag_pedantic_errors)
7010 /* Discard the type modifiers if they are invalid. */
7021 /* Decide whether an integer type is signed or not.
7022 Optionally treat bitfields as signed by default. */
7026 It is implementation-defined whether a plain (neither
7027 explicitly signed or unsigned) char, short, int, or long
7028 bit-field is signed or unsigned.
7030 Naturally, we extend this to long long as well. Note that
7031 this does not include wchar_t. */
7032 || (bitfield && !flag_signed_bitfields
7034 /* A typedef for plain `int' without `signed' can be
7035 controlled just like plain `int', but a typedef for
7036 `signed int' cannot be so controlled. */
7038 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
7039 && (TREE_CODE (type) == INTEGER_TYPE
7040 || TREE_CODE (type) == CHAR_TYPE)
7041 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
7044 type = long_long_unsigned_type_node;
7046 type = long_unsigned_type_node;
7048 type = short_unsigned_type_node;
7049 else if (type == char_type_node)
7050 type = unsigned_char_type_node;
7051 else if (typedef_decl)
7052 type = c_common_unsigned_type (type);
7054 type = unsigned_type_node;
7056 else if (signed_p && type == char_type_node)
7057 type = signed_char_type_node;
7059 type = long_long_integer_type_node;
7061 type = long_integer_type_node;
7063 type = short_integer_type_node;
7065 if (declspecs->specs[(int)ds_complex])
7067 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
7068 error ("complex invalid for %qs", name);
7069 /* If we just have "complex", it is equivalent to
7070 "complex double", but if any modifiers at all are specified it is
7071 the complex form of TYPE. E.g, "complex short" is
7072 "complex short int". */
7074 else if (defaulted_int && ! longlong
7075 && ! (long_p || short_p || signed_p || unsigned_p))
7076 type = complex_double_type_node;
7077 else if (type == integer_type_node)
7078 type = complex_integer_type_node;
7079 else if (type == float_type_node)
7080 type = complex_float_type_node;
7081 else if (type == double_type_node)
7082 type = complex_double_type_node;
7083 else if (type == long_double_type_node)
7084 type = complex_long_double_type_node;
7086 type = build_complex_type (type);
7089 type_quals = TYPE_UNQUALIFIED;
7090 if (declspecs->specs[(int)ds_const])
7091 type_quals |= TYPE_QUAL_CONST;
7092 if (declspecs->specs[(int)ds_volatile])
7093 type_quals |= TYPE_QUAL_VOLATILE;
7094 if (declspecs->specs[(int)ds_restrict])
7095 type_quals |= TYPE_QUAL_RESTRICT;
7096 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
7097 error ("qualifiers are not allowed on declaration of %<operator %T%>",
7100 if (TREE_CODE (type) == FUNCTION_TYPE
7101 && type_quals != TYPE_UNQUALIFIED)
7103 /* This was an error in C++98 (cv-qualifiers cannot be added to
7104 a function type), but DR 295 makes the code well-formed by
7105 dropping the extra qualifiers. */
7108 tree bad_type = build_qualified_type (type, type_quals);
7109 pedwarn ("ignoring %qV qualifiers added to function type %qT",
7112 type_quals = TYPE_UNQUALIFIED;
7114 type_quals |= cp_type_quals (type);
7115 type = cp_build_qualified_type_real
7116 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
7117 ? tf_ignore_bad_quals : 0) | tf_error | tf_warning));
7118 /* We might have ignored or rejected some of the qualifiers. */
7119 type_quals = cp_type_quals (type);
7122 inlinep = !! declspecs->specs[(int)ds_inline];
7123 virtualp = !! declspecs->specs[(int)ds_virtual];
7124 explicitp = !! declspecs->specs[(int)ds_explicit];
7126 storage_class = declspecs->storage_class;
7127 if (storage_class == sc_static)
7128 staticp = 1 + (decl_context == FIELD);
7130 if (virtualp && staticp == 2)
7132 error ("member %qD cannot be declared both virtual and static", dname);
7135 friendp = !! declspecs->specs[(int)ds_friend];
7137 if (dependant_name && !friendp)
7139 error ("%<%T::%D%> is not a valid declarator", ctype, dependant_name);
7140 return void_type_node;
7143 /* Issue errors about use of storage classes for parameters. */
7144 if (decl_context == PARM)
7146 if (declspecs->specs[(int)ds_typedef])
7147 error ("typedef declaration invalid in parameter declaration");
7148 else if (storage_class == sc_static
7149 || storage_class == sc_extern
7151 error ("storage class specifiers invalid in parameter declarations");
7154 /* Give error if `virtual' is used outside of class declaration. */
7156 && (current_class_name == NULL_TREE || decl_context != FIELD))
7158 error ("virtual outside class declaration");
7162 /* Static anonymous unions are dealt with here. */
7163 if (staticp && decl_context == TYPENAME
7165 && ANON_AGGR_TYPE_P (declspecs->type))
7166 decl_context = FIELD;
7168 /* Warn about storage classes that are invalid for certain
7169 kinds of declarations (parameters, typenames, etc.). */
7170 if (declspecs->multiple_storage_classes_p)
7172 error ("multiple storage classes in declaration of %qs", name);
7173 storage_class = sc_none;
7177 && storage_class != sc_extern
7178 && storage_class != sc_static)
7179 || declspecs->specs[(int)ds_typedef]))
7181 error ("multiple storage classes in declaration of %qs", name);
7184 else if (decl_context != NORMAL
7185 && ((storage_class != sc_none
7186 && storage_class != sc_mutable)
7189 if ((decl_context == PARM || decl_context == CATCHPARM)
7190 && (storage_class == sc_register
7191 || storage_class == sc_auto))
7193 else if (declspecs->specs[(int)ds_typedef])
7195 else if (decl_context == FIELD
7196 /* C++ allows static class elements. */
7197 && storage_class == sc_static)
7198 /* C++ also allows inlines and signed and unsigned elements,
7199 but in those cases we don't come in here. */
7203 if (decl_context == FIELD)
7204 error ("storage class specified for %qs", name);
7207 if (decl_context == PARM || decl_context == CATCHPARM)
7208 error ("storage class specified for parameter %qs", name);
7210 error ("storage class specified for typename");
7212 if (storage_class == sc_register
7213 || storage_class == sc_auto
7214 || storage_class == sc_extern
7216 storage_class = sc_none;
7219 else if (storage_class == sc_extern && initialized
7222 if (toplevel_bindings_p ())
7224 /* It's common practice (and completely valid) to have a const
7225 be initialized and declared extern. */
7226 if (!(type_quals & TYPE_QUAL_CONST))
7227 warning (0, "%qs initialized and declared %<extern%>", name);
7230 error ("%qs has both %<extern%> and initializer", name);
7232 else if (storage_class == sc_extern && funcdef_flag
7233 && ! toplevel_bindings_p ())
7234 error ("nested function %qs declared %<extern%>", name);
7235 else if (toplevel_bindings_p ())
7237 if (storage_class == sc_auto)
7238 error ("top-level declaration of %qs specifies %<auto%>", name);
7241 && storage_class != sc_extern
7242 && storage_class != sc_static)
7244 error ("function-scope %qs implicitly auto and declared %<__thread%>",
7249 if (storage_class && friendp)
7250 error ("storage class specifiers invalid in friend function declarations");
7253 unqualified_id = NULL_TREE;
7256 unqualified_id = id_declarator->u.id.unqualified_name;
7257 switch (TREE_CODE (unqualified_id))
7261 = constructor_name (TREE_OPERAND (unqualified_id, 0));
7264 case IDENTIFIER_NODE:
7265 case TEMPLATE_ID_EXPR:
7273 /* Determine the type of the entity declared by recurring on the
7275 for (; declarator; declarator = declarator->declarator)
7277 const cp_declarator *inner_declarator;
7280 if (type == error_mark_node)
7281 return error_mark_node;
7283 attrs = declarator->attributes;
7289 if (declarator == NULL || declarator->kind == cdk_id)
7290 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
7291 if (declarator->kind == cdk_function)
7292 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
7293 if (declarator->kind == cdk_array)
7294 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
7295 returned_attrs = decl_attributes (&type,
7296 chainon (returned_attrs, attrs),
7300 if (declarator->kind == cdk_id)
7303 inner_declarator = declarator->declarator;
7305 switch (declarator->kind)
7308 type = create_array_type_for_decl (dname, type,
7309 declarator->u.array.bounds);
7317 /* Declaring a function type.
7318 Make sure we have a valid type for the function to return. */
7320 /* We now know that the TYPE_QUALS don't apply to the
7321 decl, but to its return type. */
7322 type_quals = TYPE_UNQUALIFIED;
7324 /* Warn about some types functions can't return. */
7326 if (TREE_CODE (type) == FUNCTION_TYPE)
7328 error ("%qs declared as function returning a function", name);
7329 type = integer_type_node;
7331 if (TREE_CODE (type) == ARRAY_TYPE)
7333 error ("%qs declared as function returning an array", name);
7334 type = integer_type_node;
7337 /* Pick up type qualifiers which should be applied to `this'. */
7338 quals = declarator->u.function.qualifiers;
7340 /* Pick up the exception specifications. */
7341 raises = declarator->u.function.exception_specification;
7343 /* Say it's a definition only for the CALL_EXPR
7344 closest to the identifier. */
7345 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
7347 if (ctype == NULL_TREE
7348 && decl_context == FIELD
7350 && (friendp == 0 || dname == current_class_name))
7351 ctype = current_class_type;
7353 if (ctype && (sfk == sfk_constructor
7354 || sfk == sfk_destructor))
7356 /* We are within a class's scope. If our declarator name
7357 is the same as the class name, and we are defining
7358 a function, then it is a constructor/destructor, and
7359 therefore returns a void type. */
7361 if (flags == DTOR_FLAG)
7363 /* ISO C++ 12.4/2. A destructor may not be
7364 declared const or volatile. A destructor may
7367 error ("destructor cannot be static member function");
7370 error ("destructors may not be cv-qualified");
7371 quals = TYPE_UNQUALIFIED;
7373 if (decl_context == FIELD)
7375 if (! member_function_or_else (ctype,
7378 return void_type_node;
7381 else /* It's a constructor. */
7385 /* ISO C++ 12.1. A constructor may not be
7386 declared const or volatile. A constructor may
7387 not be virtual. A constructor may not be
7390 error ("constructor cannot be static member function");
7393 pedwarn ("constructors cannot be declared virtual");
7398 error ("constructors may not be cv-qualified");
7399 quals = TYPE_UNQUALIFIED;
7401 if (decl_context == FIELD)
7403 if (! member_function_or_else (ctype,
7406 return void_type_node;
7407 TYPE_HAS_CONSTRUCTOR (ctype) = 1;
7408 if (sfk != sfk_constructor)
7412 if (decl_context == FIELD)
7418 error ("can't initialize friend function %qs", name);
7421 /* Cannot be both friend and virtual. */
7422 error ("virtual functions cannot be friends");
7425 if (decl_context == NORMAL)
7426 error ("friend declaration not in class definition");
7427 if (current_function_decl && funcdef_flag)
7428 error ("can't define friend function %qs in a local "
7433 arg_types = grokparms (declarator->u.function.parameters,
7436 if (inner_declarator
7437 && inner_declarator->kind == cdk_id
7438 && inner_declarator->u.id.sfk == sfk_destructor
7439 && arg_types != void_list_node)
7441 error ("destructors may not have parameters");
7442 arg_types = void_list_node;
7446 type = build_function_type (type, arg_types);
7447 type = cp_build_qualified_type (type, quals);
7454 /* Filter out pointers-to-references and references-to-references.
7455 We can get these if a TYPE_DECL is used. */
7457 if (TREE_CODE (type) == REFERENCE_TYPE)
7459 error (declarator->kind == cdk_reference
7460 ? "cannot declare reference to %q#T"
7461 : "cannot declare pointer to %q#T", type);
7462 type = TREE_TYPE (type);
7464 else if (VOID_TYPE_P (type))
7466 if (declarator->kind == cdk_reference)
7467 error ("cannot declare reference to %q#T", type);
7468 else if (declarator->kind == cdk_ptrmem)
7469 error ("cannot declare pointer to %q#T member", type);
7472 /* We now know that the TYPE_QUALS don't apply to the decl,
7473 but to the target of the pointer. */
7474 type_quals = TYPE_UNQUALIFIED;
7476 if (declarator->kind == cdk_ptrmem
7477 && (TREE_CODE (type) == FUNCTION_TYPE
7478 || (quals && TREE_CODE (type) == METHOD_TYPE)))
7482 /* If the type is a FUNCTION_TYPE, pick up the
7483 qualifiers from that function type. No other
7484 qualifiers may be supplied. */
7485 if (TREE_CODE (type) == FUNCTION_TYPE)
7486 quals = cp_type_quals (type);
7488 dummy = build_decl (TYPE_DECL, NULL_TREE, type);
7489 grok_method_quals (declarator->u.pointer.class_type,
7491 type = TREE_TYPE (dummy);
7492 quals = TYPE_UNQUALIFIED;
7495 if (declarator->kind == cdk_reference)
7497 if (!VOID_TYPE_P (type))
7498 type = build_reference_type (type);
7500 else if (TREE_CODE (type) == METHOD_TYPE)
7501 type = build_ptrmemfunc_type (build_pointer_type (type));
7502 else if (declarator->kind == cdk_ptrmem)
7504 /* We might have parsed a namespace as the class type. */
7505 if (TREE_CODE (declarator->u.pointer.class_type)
7508 error ("%qD is a namespace",
7509 declarator->u.pointer.class_type);
7510 type = build_pointer_type (type);
7512 else if (declarator->u.pointer.class_type == error_mark_node)
7513 /* We will already have complained. */
7514 type = error_mark_node;
7516 type = build_ptrmem_type (declarator->u.pointer.class_type,
7520 type = build_pointer_type (type);
7522 /* Process a list of type modifier keywords (such as
7523 const or volatile) that were given inside the `*' or `&'. */
7525 if (declarator->u.pointer.qualifiers)
7528 = cp_build_qualified_type (type,
7529 declarator->u.pointer.qualifiers);
7530 type_quals = cp_type_quals (type);
7543 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
7544 && TREE_CODE (type) != FUNCTION_TYPE
7545 && TREE_CODE (type) != METHOD_TYPE)
7547 error ("template-id %qD used as a declarator",
7549 unqualified_id = dname;
7552 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
7553 qualified with a class-name, turn it into a METHOD_TYPE, unless
7554 we know that the function is static. We take advantage of this
7555 opportunity to do other processing that pertains to entities
7556 explicitly declared to be class members. Note that if DECLARATOR
7557 is non-NULL, we know it is a cdk_id declarator; otherwise, we
7558 would not have exited the loop above. */
7560 && declarator->u.id.qualifying_scope
7561 && TYPE_P (declarator->u.id.qualifying_scope))
7565 ctype = declarator->u.id.qualifying_scope;
7566 ctype = TYPE_MAIN_VARIANT (ctype);
7568 while (t != NULL_TREE && CLASS_TYPE_P (t))
7570 /* You're supposed to have one `template <...>' for every
7571 template class, but you don't need one for a full
7572 specialization. For example:
7574 template <class T> struct S{};
7575 template <> struct S<int> { void f(); };
7576 void S<int>::f () {}
7578 is correct; there shouldn't be a `template <>' for the
7579 definition of `S<int>::f'. */
7580 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
7581 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
7582 /* T is an explicit (not partial) specialization. All
7583 containing classes must therefore also be explicitly
7586 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
7587 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
7588 template_count += 1;
7590 t = TYPE_MAIN_DECL (t);
7591 t = DECL_CONTEXT (t);
7594 if (ctype == current_class_type)
7597 pedwarn ("member functions are implicitly friends of their class");
7599 pedwarn ("extra qualification %<%T::%> on member %qs",
7602 else if (TREE_CODE (type) == FUNCTION_TYPE)
7604 tree sname = declarator->u.id.unqualified_name;
7606 if (current_class_type
7607 && (!friendp || funcdef_flag))
7610 ? "cannot define member function %<%T::%s%> within %<%T%>"
7611 : "cannot declare member function %<%T::%s%> within %<%T%>",
7612 ctype, name, current_class_type);
7613 return error_mark_node;
7616 if (TREE_CODE (sname) == IDENTIFIER_NODE
7617 && NEW_DELETE_OPNAME_P (sname))
7618 /* Overloaded operator new and operator delete
7619 are always static functions. */
7622 type = build_method_type_directly (ctype,
7624 TYPE_ARG_TYPES (type));
7626 else if (declspecs->specs[(int)ds_typedef]
7627 || COMPLETE_TYPE_P (complete_type (ctype)))
7629 /* Have to move this code elsewhere in this function.
7630 this code is used for i.e., typedef int A::M; M *pm;
7632 It is? How? jason 10/2/94 */
7634 if (current_class_type)
7636 error ("cannot declare member %<%T::%s%> within %qT",
7637 ctype, name, current_class_type);
7638 return void_type_node;
7643 cxx_incomplete_type_error (NULL_TREE, ctype);
7644 return error_mark_node;
7648 /* Now TYPE has the actual type. */
7653 *attrlist = chainon (returned_attrs, *attrlist);
7655 attrlist = &returned_attrs;
7658 /* Did array size calculations overflow? */
7660 if (TREE_CODE (type) == ARRAY_TYPE
7661 && COMPLETE_TYPE_P (type)
7662 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
7663 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
7665 error ("size of array %qs is too large", name);
7666 /* If we proceed with the array type as it is, we'll eventually
7667 crash in tree_low_cst(). */
7668 type = error_mark_node;
7671 if ((decl_context == FIELD || decl_context == PARM)
7672 && !processing_template_decl
7673 && variably_modified_type_p (type, NULL_TREE))
7675 if (decl_context == FIELD)
7676 error ("data member may not have variably modified type %qT", type);
7678 error ("parameter may not have variably modified type %qT", type);
7679 type = error_mark_node;
7682 if (explicitp == 1 || (explicitp && friendp))
7684 /* [dcl.fct.spec] The explicit specifier shall only be used in
7685 declarations of constructors within a class definition. */
7686 error ("only declarations of constructors can be %<explicit%>");
7690 if (storage_class == sc_mutable)
7692 if (decl_context != FIELD || friendp)
7694 error ("non-member %qs cannot be declared %<mutable%>", name);
7695 storage_class = sc_none;
7697 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
7699 error ("non-object member %qs cannot be declared %<mutable%>", name);
7700 storage_class = sc_none;
7702 else if (TREE_CODE (type) == FUNCTION_TYPE
7703 || TREE_CODE (type) == METHOD_TYPE)
7705 error ("function %qs cannot be declared %<mutable%>", name);
7706 storage_class = sc_none;
7710 error ("static %qs cannot be declared %<mutable%>", name);
7711 storage_class = sc_none;
7713 else if (type_quals & TYPE_QUAL_CONST)
7715 error ("const %qs cannot be declared %<mutable%>", name);
7716 storage_class = sc_none;
7720 /* If this is declaring a typedef name, return a TYPE_DECL. */
7721 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
7725 /* Note that the grammar rejects storage classes
7726 in typenames, fields or parameters. */
7727 if (current_lang_name == lang_name_java)
7728 TYPE_FOR_JAVA (type) = 1;
7730 if (decl_context == FIELD)
7731 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
7733 decl = build_decl (TYPE_DECL, unqualified_id, type);
7734 if (id_declarator && declarator->u.id.qualifying_scope)
7735 error ("%Jtypedef name may not be a nested-name-specifier", decl);
7737 if (decl_context != FIELD)
7739 if (!current_function_decl)
7740 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
7741 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
7742 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
7743 (current_function_decl)))
7744 /* The TYPE_DECL is "abstract" because there will be
7745 clones of this constructor/destructor, and there will
7746 be copies of this TYPE_DECL generated in those
7748 DECL_ABSTRACT (decl) = 1;
7750 else if (constructor_name_p (unqualified_id, current_class_type))
7751 pedwarn ("ISO C++ forbids nested type %qD with same name "
7752 "as enclosing class",
7755 /* If the user declares "typedef struct {...} foo" then the
7756 struct will have an anonymous name. Fill that name in now.
7757 Nothing can refer to it, so nothing needs know about the name
7759 if (type != error_mark_node
7762 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
7763 && TYPE_ANONYMOUS_P (type)
7764 /* Don't do this if there are attributes. */
7765 && (!attrlist || !*attrlist)
7766 && cp_type_quals (type) == TYPE_UNQUALIFIED)
7768 tree oldname = TYPE_NAME (type);
7771 /* Replace the anonymous name with the real name everywhere. */
7772 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
7773 if (TYPE_NAME (t) == oldname)
7774 TYPE_NAME (t) = decl;
7776 if (TYPE_LANG_SPECIFIC (type))
7777 TYPE_WAS_ANONYMOUS (type) = 1;
7779 /* If this is a typedef within a template class, the nested
7780 type is a (non-primary) template. The name for the
7781 template needs updating as well. */
7782 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
7783 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
7784 = TYPE_IDENTIFIER (type);
7786 /* FIXME remangle member functions; member functions of a
7787 type with external linkage have external linkage. */
7792 if (ctype == NULL_TREE)
7794 if (TREE_CODE (type) == METHOD_TYPE)
7795 ctype = TYPE_METHOD_BASETYPE (type);
7796 /* Any qualifiers on a function type typedef have
7797 already been dealt with. */
7798 else if (TREE_CODE (type) == FUNCTION_TYPE)
7799 quals = TYPE_UNQUALIFIED;
7801 if (ctype != NULL_TREE)
7802 grok_method_quals (ctype, decl, quals);
7806 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
7807 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
7809 bad_specifiers (decl, "type", virtualp, quals != TYPE_UNQUALIFIED,
7810 inlinep, friendp, raises != NULL_TREE);
7815 /* Detect the case of an array type of unspecified size
7816 which came, as such, direct from a typedef name.
7817 We must copy the type, so that the array's domain can be
7818 individually set by the object's initializer. */
7820 if (type && typedef_type
7821 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
7822 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
7823 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
7825 /* Detect where we're using a typedef of function type to declare a
7826 function. PARMS will not be set, so we must create it now. */
7828 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
7830 tree decls = NULL_TREE;
7833 for (args = TYPE_ARG_TYPES (type); args; args = TREE_CHAIN (args))
7835 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
7837 TREE_CHAIN (decl) = decls;
7841 parms = nreverse (decls);
7843 if (decl_context != TYPENAME)
7845 /* A cv-qualifier-seq shall only be part of the function type
7846 for a non-static member function. [8.3.5/4 dcl.fct] */
7847 if (cp_type_quals (type) != TYPE_UNQUALIFIED
7848 && (current_class_type == NULL_TREE || staticp) )
7850 error ("qualified function types cannot be used to declare %s functions",
7851 (staticp? "static member" : "free"));
7852 type = TYPE_MAIN_VARIANT (type);
7855 /* The qualifiers on the function type become the qualifiers on
7856 the non-static member function. */
7857 quals |= cp_type_quals (type);
7861 /* If this is a type name (such as, in a cast or sizeof),
7862 compute the type and return it now. */
7864 if (decl_context == TYPENAME)
7866 /* Note that the grammar rejects storage classes
7867 in typenames, fields or parameters. */
7868 if (type_quals != TYPE_UNQUALIFIED)
7869 type_quals = TYPE_UNQUALIFIED;
7871 /* Special case: "friend class foo" looks like a TYPENAME context. */
7874 if (type_quals != TYPE_UNQUALIFIED)
7876 error ("type qualifiers specified for friend class declaration");
7877 type_quals = TYPE_UNQUALIFIED;
7881 error ("%<inline%> specified for friend class declaration");
7887 /* Don't allow friend declaration without a class-key. */
7888 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
7889 pedwarn ("template parameters cannot be friends");
7890 else if (TREE_CODE (type) == TYPENAME_TYPE)
7891 pedwarn ("friend declaration requires class-key, "
7892 "i.e. %<friend class %T::%D%>",
7893 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
7895 pedwarn ("friend declaration requires class-key, "
7896 "i.e. %<friend %#T%>",
7900 /* Only try to do this stuff if we didn't already give up. */
7901 if (type != integer_type_node)
7903 /* A friendly class? */
7904 if (current_class_type)
7905 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
7908 error ("trying to make class %qT a friend of global scope",
7911 type = void_type_node;
7916 if (ctype == NULL_TREE)
7918 if (TREE_CODE (type) != METHOD_TYPE)
7919 error ("invalid qualifiers on non-member function type");
7921 ctype = TYPE_METHOD_BASETYPE (type);
7925 tree dummy = build_decl (TYPE_DECL, unqualified_id, type);
7926 grok_method_quals (ctype, dummy, quals);
7927 type = TREE_TYPE (dummy);
7933 else if (unqualified_id == NULL_TREE && decl_context != PARM
7934 && decl_context != CATCHPARM
7935 && TREE_CODE (type) != UNION_TYPE
7938 error ("abstract declarator %qT used as declaration", type);
7939 return error_mark_node;
7942 /* Only functions may be declared using an operator-function-id. */
7944 && IDENTIFIER_OPNAME_P (unqualified_id)
7945 && TREE_CODE (type) != FUNCTION_TYPE
7946 && TREE_CODE (type) != METHOD_TYPE)
7948 error ("declaration of %qD as non-function", unqualified_id);
7949 return error_mark_node;
7952 /* We don't check parameter types here because we can emit a better
7953 error message later. */
7954 if (decl_context != PARM)
7955 type = check_var_type (unqualified_id, type);
7957 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
7958 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
7960 if (decl_context == PARM || decl_context == CATCHPARM)
7962 if (ctype || in_namespace)
7963 error ("cannot use %<::%> in parameter declaration");
7965 /* A parameter declared as an array of T is really a pointer to T.
7966 One declared as a function is really a pointer to a function.
7967 One declared as a member is really a pointer to member. */
7969 if (TREE_CODE (type) == ARRAY_TYPE)
7971 /* Transfer const-ness of array into that of type pointed to. */
7972 type = build_pointer_type (TREE_TYPE (type));
7973 type_quals = TYPE_UNQUALIFIED;
7975 else if (TREE_CODE (type) == FUNCTION_TYPE)
7976 type = build_pointer_type (type);
7982 if (decl_context == PARM)
7984 decl = cp_build_parm_decl (unqualified_id, type);
7986 bad_specifiers (decl, "parameter", virtualp, quals != TYPE_UNQUALIFIED,
7987 inlinep, friendp, raises != NULL_TREE);
7989 else if (decl_context == FIELD)
7991 /* The C99 flexible array extension. */
7992 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
7993 && TYPE_DOMAIN (type) == NULL_TREE)
7995 tree itype = compute_array_index_type (dname, integer_zero_node);
7996 type = build_cplus_array_type (TREE_TYPE (type), itype);
7999 if (type == error_mark_node)
8001 /* Happens when declaring arrays of sizes which
8002 are error_mark_node, for example. */
8005 else if (in_namespace && !friendp)
8007 /* Something like struct S { int N::j; }; */
8008 error ("invalid use of %<::%>");
8011 else if (TREE_CODE (type) == FUNCTION_TYPE)
8014 tree function_context;
8018 if (ctype == NULL_TREE)
8019 ctype = current_class_type;
8021 if (ctype == NULL_TREE)
8023 error ("can't make %qD into a method -- not in a class",
8025 return void_type_node;
8028 /* ``A union may [ ... ] not [ have ] virtual functions.''
8030 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
8032 error ("function %qD declared virtual inside a union",
8034 return void_type_node;
8037 if (NEW_DELETE_OPNAME_P (unqualified_id))
8041 error ("%qD cannot be declared virtual, since it "
8047 else if (staticp < 2)
8048 type = build_method_type_directly (ctype,
8050 TYPE_ARG_TYPES (type));
8053 /* Check that the name used for a destructor makes sense. */
8054 if (sfk == sfk_destructor)
8058 gcc_assert (friendp);
8059 error ("expected qualified name in friend declaration "
8060 "for destructor %qD",
8061 id_declarator->u.id.unqualified_name);
8062 return error_mark_node;
8065 if (!same_type_p (TREE_OPERAND
8066 (id_declarator->u.id.unqualified_name, 0),
8069 error ("declaration of %qD as member of %qT",
8070 id_declarator->u.id.unqualified_name, ctype);
8071 return error_mark_node;
8075 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
8076 function_context = (ctype != NULL_TREE) ?
8077 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
8078 publicp = (! friendp || ! staticp)
8079 && function_context == NULL_TREE;
8080 decl = grokfndecl (ctype, type,
8081 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
8082 ? unqualified_id : dname,
8085 virtualp, flags, quals, raises,
8086 friendp ? -1 : 0, friendp, publicp, inlinep,
8088 funcdef_flag, template_count, in_namespace, attrlist);
8089 if (decl == NULL_TREE)
8092 /* This clobbers the attrs stored in `decl' from `attrlist'. */
8093 /* The decl and setting of decl_attr is also turned off. */
8094 decl = build_decl_attribute_variant (decl, decl_attr);
8097 /* [class.conv.ctor]
8099 A constructor declared without the function-specifier
8100 explicit that can be called with a single parameter
8101 specifies a conversion from the type of its first
8102 parameter to the type of its class. Such a constructor
8103 is called a converting constructor. */
8105 DECL_NONCONVERTING_P (decl) = 1;
8106 else if (DECL_CONSTRUCTOR_P (decl))
8108 /* The constructor can be called with exactly one
8109 parameter if there is at least one parameter, and
8110 any subsequent parameters have default arguments.
8111 Ignore any compiler-added parms. */
8112 tree arg_types = FUNCTION_FIRST_USER_PARMTYPE (decl);
8114 if (arg_types == void_list_node
8116 && TREE_CHAIN (arg_types)
8117 && TREE_CHAIN (arg_types) != void_list_node
8118 && !TREE_PURPOSE (TREE_CHAIN (arg_types))))
8119 DECL_NONCONVERTING_P (decl) = 1;
8122 else if (TREE_CODE (type) == METHOD_TYPE)
8124 /* We only get here for friend declarations of
8125 members of other classes. */
8126 /* All method decls are public, so tell grokfndecl to set
8127 TREE_PUBLIC, also. */
8128 decl = grokfndecl (ctype, type,
8129 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
8130 ? unqualified_id : dname,
8133 virtualp, flags, quals, raises,
8134 friendp ? -1 : 0, friendp, 1, 0, sfk,
8135 funcdef_flag, template_count, in_namespace,
8137 if (decl == NULL_TREE)
8140 else if (!staticp && !dependent_type_p (type)
8141 && !COMPLETE_TYPE_P (complete_type (type))
8142 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
8145 error ("field %qD has incomplete type", unqualified_id);
8147 error ("name %qT has incomplete type", type);
8149 /* If we're instantiating a template, tell them which
8150 instantiation made the field's type be incomplete. */
8151 if (current_class_type
8152 && TYPE_NAME (current_class_type)
8153 && IDENTIFIER_TEMPLATE (TYPE_IDENTIFIER (current_class_type))
8155 && declspecs->type == type)
8156 error (" in instantiation of template %qT",
8157 current_class_type);
8159 type = error_mark_node;
8166 error ("%qE is neither function nor member function; "
8167 "cannot be declared friend", unqualified_id);
8175 /* Friends are treated specially. */
8176 if (ctype == current_class_type)
8177 ; /* We already issued a pedwarn. */
8178 else if (decl && DECL_NAME (decl))
8180 if (template_class_depth (current_class_type) == 0)
8182 decl = check_explicit_specialization
8183 (unqualified_id, decl, template_count,
8184 2 * funcdef_flag + 4);
8185 if (decl == error_mark_node)
8186 return error_mark_node;
8189 decl = do_friend (ctype, unqualified_id, decl,
8190 *attrlist, flags, quals, funcdef_flag);
8194 return void_type_node;
8197 /* Structure field. It may not be a function, except for C++. */
8199 if (decl == NULL_TREE)
8205 /* An attempt is being made to initialize a non-static
8206 member. But, from [class.mem]:
8208 4 A member-declarator can contain a
8209 constant-initializer only if it declares a static
8210 member (_class.static_) of integral or enumeration
8211 type, see _class.static.data_.
8213 This used to be relatively common practice, but
8214 the rest of the compiler does not correctly
8215 handle the initialization unless the member is
8216 static so we make it static below. */
8217 pedwarn ("ISO C++ forbids initialization of member %qD",
8219 pedwarn ("making %qD static", unqualified_id);
8223 if (uses_template_parms (type))
8224 /* We'll check at instantiation time. */
8226 else if (check_static_variable_definition (unqualified_id,
8228 /* If we just return the declaration, crashes
8229 will sometimes occur. We therefore return
8230 void_type_node, as if this was a friend
8231 declaration, to cause callers to completely
8232 ignore this declaration. */
8233 return void_type_node;
8238 /* C++ allows static class members. All other work
8239 for this is done by grokfield. */
8240 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
8241 set_linkage_for_static_data_member (decl);
8242 /* Even if there is an in-class initialization, DECL
8243 is considered undefined until an out-of-class
8244 definition is provided. */
8245 DECL_EXTERNAL (decl) = 1;
8249 if (targetm.have_tls)
8250 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
8252 /* A mere warning is sure to result in improper
8253 semantics at runtime. Don't bother to allow this to
8255 error ("thread-local storage not supported for this target");
8260 decl = build_decl (FIELD_DECL, unqualified_id, type);
8261 DECL_NONADDRESSABLE_P (decl) = bitfield;
8262 if (storage_class == sc_mutable)
8264 DECL_MUTABLE_P (decl) = 1;
8265 storage_class = sc_none;
8269 bad_specifiers (decl, "field", virtualp, quals != TYPE_UNQUALIFIED,
8270 inlinep, friendp, raises != NULL_TREE);
8273 else if (TREE_CODE (type) == FUNCTION_TYPE
8274 || TREE_CODE (type) == METHOD_TYPE)
8279 if (!unqualified_id)
8282 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
8283 original_name = dname;
8285 original_name = unqualified_id;
8287 if (storage_class == sc_auto)
8288 error ("storage class %<auto%> invalid for function %qs", name);
8289 else if (storage_class == sc_register)
8290 error ("storage class %<register%> invalid for function %qs", name);
8292 error ("storage class %<__thread%> invalid for function %qs", name);
8294 /* Function declaration not at top level.
8295 Storage classes other than `extern' are not allowed
8296 and `extern' makes no difference. */
8297 if (! toplevel_bindings_p ()
8298 && (storage_class == sc_static
8299 || declspecs->specs[(int)ds_inline])
8302 if (storage_class == sc_static)
8303 pedwarn ("%<static%> specified invalid for function %qs "
8304 "declared out of global scope", name);
8306 pedwarn ("%<inline%> specifier invalid for function %qs "
8307 "declared out of global scope", name);
8310 if (ctype == NULL_TREE)
8314 error ("virtual non-class function %qs", name);
8318 else if (TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
8319 && !NEW_DELETE_OPNAME_P (original_name))
8320 type = build_method_type_directly (ctype,
8322 TYPE_ARG_TYPES (type));
8324 /* Record presence of `static'. */
8325 publicp = (ctype != NULL_TREE
8326 || storage_class == sc_extern
8327 || storage_class != sc_static);
8329 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
8330 virtualp, flags, quals, raises,
8332 publicp, inlinep, sfk, funcdef_flag,
8333 template_count, in_namespace, attrlist);
8334 if (decl == NULL_TREE)
8339 int invalid_static = 0;
8341 /* Don't allow a static member function in a class, and forbid
8342 declaring main to be static. */
8343 if (TREE_CODE (type) == METHOD_TYPE)
8345 pedwarn ("cannot declare member function %qD to have "
8346 "static linkage", decl);
8349 else if (current_function_decl)
8351 /* FIXME need arm citation */
8352 error ("cannot declare static function inside another function");
8359 storage_class = sc_none;
8365 /* It's a variable. */
8367 /* An uninitialized decl with `extern' is a reference. */
8368 decl = grokvardecl (type, unqualified_id,
8371 (type_quals & TYPE_QUAL_CONST) != 0,
8372 ctype ? ctype : in_namespace);
8373 bad_specifiers (decl, "variable", virtualp, quals != TYPE_UNQUALIFIED,
8374 inlinep, friendp, raises != NULL_TREE);
8378 DECL_CONTEXT (decl) = ctype;
8381 pedwarn ("%<static%> may not be used when defining "
8382 "(as opposed to declaring) a static data member");
8384 storage_class = sc_none;
8386 if (storage_class == sc_register && TREE_STATIC (decl))
8388 error ("static member %qD declared %<register%>", decl);
8389 storage_class = sc_none;
8391 if (storage_class == sc_extern && pedantic)
8393 pedwarn ("cannot explicitly declare member %q#D to have "
8396 storage_class = sc_none;
8401 /* Record `register' declaration for warnings on &
8402 and in case doing stupid register allocation. */
8404 if (storage_class == sc_register)
8405 DECL_REGISTER (decl) = 1;
8406 else if (storage_class == sc_extern)
8407 DECL_THIS_EXTERN (decl) = 1;
8408 else if (storage_class == sc_static)
8409 DECL_THIS_STATIC (decl) = 1;
8411 /* Record constancy and volatility. There's no need to do this
8412 when processing a template; we'll do this for the instantiated
8413 declaration based on the type of DECL. */
8414 if (!processing_template_decl)
8415 cp_apply_type_quals_to_decl (type_quals, decl);
8421 /* Subroutine of start_function. Ensure that each of the parameter
8422 types (as listed in PARMS) is complete, as is required for a
8423 function definition. */
8426 require_complete_types_for_parms (tree parms)
8428 for (; parms; parms = TREE_CHAIN (parms))
8430 if (dependent_type_p (TREE_TYPE (parms)))
8432 if (!VOID_TYPE_P (TREE_TYPE (parms))
8433 && complete_type_or_else (TREE_TYPE (parms), parms))
8435 relayout_decl (parms);
8436 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
8439 /* grokparms or complete_type_or_else will have already issued
8441 TREE_TYPE (parms) = error_mark_node;
8445 /* Returns nonzero if T is a local variable. */
8448 local_variable_p (tree t)
8450 if ((TREE_CODE (t) == VAR_DECL
8451 /* A VAR_DECL with a context that is a _TYPE is a static data
8453 && !TYPE_P (CP_DECL_CONTEXT (t))
8454 /* Any other non-local variable must be at namespace scope. */
8455 && !DECL_NAMESPACE_SCOPE_P (t))
8456 || (TREE_CODE (t) == PARM_DECL))
8462 /* Returns nonzero if T is an automatic local variable or a label.
8463 (These are the declarations that need to be remapped when the code
8464 containing them is duplicated.) */
8467 nonstatic_local_decl_p (tree t)
8469 return ((local_variable_p (t) && !TREE_STATIC (t))
8470 || TREE_CODE (t) == LABEL_DECL
8471 || TREE_CODE (t) == RESULT_DECL);
8474 /* Like local_variable_p, but suitable for use as a tree-walking
8478 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
8479 void *data ATTRIBUTE_UNUSED)
8481 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
8483 else if (TYPE_P (*tp))
8490 /* Check that ARG, which is a default-argument expression for a
8491 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
8492 something goes wrong. DECL may also be a _TYPE node, rather than a
8493 DECL, if there is no DECL available. */
8496 check_default_argument (tree decl, tree arg)
8501 if (TREE_CODE (arg) == DEFAULT_ARG)
8502 /* We get a DEFAULT_ARG when looking at an in-class declaration
8503 with a default argument. Ignore the argument for now; we'll
8504 deal with it after the class is complete. */
8513 decl_type = TREE_TYPE (decl);
8515 if (arg == error_mark_node
8516 || decl == error_mark_node
8517 || TREE_TYPE (arg) == error_mark_node
8518 || decl_type == error_mark_node)
8519 /* Something already went wrong. There's no need to check
8521 return error_mark_node;
8523 /* [dcl.fct.default]
8525 A default argument expression is implicitly converted to the
8527 if (!TREE_TYPE (arg)
8528 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
8531 error ("default argument for %q#D has type %qT",
8532 decl, TREE_TYPE (arg));
8534 error ("default argument for parameter of type %qT has type %qT",
8535 decl_type, TREE_TYPE (arg));
8537 return error_mark_node;
8540 /* [dcl.fct.default]
8542 Local variables shall not be used in default argument
8545 The keyword `this' shall not be used in a default argument of a
8547 var = walk_tree_without_duplicates (&arg, local_variable_p_walkfn,
8551 error ("default argument %qE uses local variable %qD", arg, var);
8552 return error_mark_node;
8559 /* Decode the list of parameter types for a function type.
8560 Given the list of things declared inside the parens,
8561 return a list of types.
8563 If this parameter does not end with an ellipsis, we append
8566 *PARMS is set to the chain of PARM_DECLs created. */
8569 grokparms (cp_parameter_declarator *first_parm, tree *parms)
8571 tree result = NULL_TREE;
8572 tree decls = NULL_TREE;
8573 int ellipsis = !first_parm || first_parm->ellipsis_p;
8574 cp_parameter_declarator *parm;
8577 for (parm = first_parm; parm != NULL; parm = parm->next)
8579 tree type = NULL_TREE;
8580 tree init = parm->default_argument;
8584 if (parm == no_parameters)
8587 attrs = parm->decl_specifiers.attributes;
8588 parm->decl_specifiers.attributes = NULL_TREE;
8589 decl = grokdeclarator (parm->declarator, &parm->decl_specifiers,
8590 PARM, init != NULL_TREE, &attrs);
8591 if (! decl || TREE_TYPE (decl) == error_mark_node)
8595 cplus_decl_attributes (&decl, attrs, 0);
8597 type = TREE_TYPE (decl);
8598 if (VOID_TYPE_P (type))
8600 if (same_type_p (type, void_type_node)
8601 && DECL_SELF_REFERENCE_P (type)
8602 && !DECL_NAME (decl) && !result && !parm->next && !ellipsis)
8603 /* this is a parmlist of `(void)', which is ok. */
8605 cxx_incomplete_type_error (decl, type);
8606 /* It's not a good idea to actually create parameters of
8607 type `void'; other parts of the compiler assume that a
8608 void type terminates the parameter list. */
8609 type = error_mark_node;
8610 TREE_TYPE (decl) = error_mark_node;
8613 if (type != error_mark_node)
8615 /* Top-level qualifiers on the parameters are
8616 ignored for function types. */
8617 type = cp_build_qualified_type (type, 0);
8618 if (TREE_CODE (type) == METHOD_TYPE)
8620 error ("parameter %qD invalidly declared method type", decl);
8621 type = build_pointer_type (type);
8622 TREE_TYPE (decl) = type;
8624 else if (abstract_virtuals_error (decl, type))
8625 any_error = 1; /* Seems like a good idea. */
8626 else if (POINTER_TYPE_P (type))
8628 /* [dcl.fct]/6, parameter types cannot contain pointers
8629 (references) to arrays of unknown bound. */
8630 tree t = TREE_TYPE (type);
8631 int ptr = TYPE_PTR_P (type);
8637 else if (TREE_CODE (t) != ARRAY_TYPE)
8639 else if (!TYPE_DOMAIN (t))
8643 if (TREE_CODE (t) == ARRAY_TYPE)
8644 error ("parameter %qD includes %s to array of unknown "
8646 decl, ptr ? "pointer" : "reference", t);
8651 else if (init && !processing_template_decl)
8652 init = check_default_argument (decl, init);
8655 TREE_CHAIN (decl) = decls;
8657 result = tree_cons (init, type, result);
8659 decls = nreverse (decls);
8660 result = nreverse (result);
8662 result = chainon (result, void_list_node);
8669 /* D is a constructor or overloaded `operator='.
8671 Let T be the class in which D is declared. Then, this function
8674 -1 if D's is an ill-formed constructor or copy assignment operator
8675 whose first parameter is of type `T'.
8676 0 if D is not a copy constructor or copy assignment
8678 1 if D is a copy constructor or copy assignment operator whose
8679 first parameter is a reference to const qualified T.
8680 2 if D is a copy constructor or copy assignment operator whose
8681 first parameter is a reference to non-const qualified T.
8683 This function can be used as a predicate. Positive values indicate
8684 a copy constructor and nonzero values indicate a copy assignment
8694 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
8696 if (DECL_TEMPLATE_INFO (d)
8697 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d)))
8698 /* Instantiations of template member functions are never copy
8699 functions. Note that member functions of templated classes are
8700 represented as template functions internally, and we must
8701 accept those as copy functions. */
8704 args = FUNCTION_FIRST_USER_PARMTYPE (d);
8708 arg_type = TREE_VALUE (args);
8710 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
8712 /* Pass by value copy assignment operator. */
8715 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
8716 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
8718 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
8724 args = TREE_CHAIN (args);
8726 if (args && args != void_list_node && !TREE_PURPOSE (args))
8727 /* There are more non-optional args. */
8733 /* Remember any special properties of member function DECL. */
8735 void grok_special_member_properties (tree decl)
8737 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P(decl))
8738 ; /* Not special. */
8739 else if (DECL_CONSTRUCTOR_P (decl))
8741 int ctor = copy_fn_p (decl);
8747 A non-template constructor for class X is a copy
8748 constructor if its first parameter is of type X&, const
8749 X&, volatile X& or const volatile X&, and either there
8750 are no other parameters or else all other parameters have
8751 default arguments. */
8752 TYPE_HAS_INIT_REF (DECL_CONTEXT (decl)) = 1;
8754 TYPE_HAS_CONST_INIT_REF (DECL_CONTEXT (decl)) = 1;
8756 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
8757 TYPE_HAS_DEFAULT_CONSTRUCTOR (DECL_CONTEXT (decl)) = 1;
8759 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
8763 A non-template assignment operator for class X is a copy
8764 assignment operator if its parameter is of type X, X&, const
8765 X&, volatile X& or const volatile X&. */
8767 int assop = copy_fn_p (decl);
8771 TYPE_HAS_ASSIGN_REF (DECL_CONTEXT (decl)) = 1;
8773 TYPE_HAS_CONST_ASSIGN_REF (DECL_CONTEXT (decl)) = 1;
8778 /* Check a constructor DECL has the correct form. Complains
8779 if the class has a constructor of the form X(X). */
8782 grok_ctor_properties (tree ctype, tree decl)
8784 int ctor_parm = copy_fn_p (decl);
8790 A declaration of a constructor for a class X is ill-formed if
8791 its first parameter is of type (optionally cv-qualified) X
8792 and either there are no other parameters or else all other
8793 parameters have default arguments.
8795 We *don't* complain about member template instantiations that
8796 have this form, though; they can occur as we try to decide
8797 what constructor to use during overload resolution. Since
8798 overload resolution will never prefer such a constructor to
8799 the non-template copy constructor (which is either explicitly
8800 or implicitly defined), there's no need to worry about their
8801 existence. Theoretically, they should never even be
8802 instantiated, but that's hard to forestall. */
8803 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
8811 /* An operator with this code is unary, but can also be binary. */
8814 ambi_op_p (enum tree_code code)
8816 return (code == INDIRECT_REF
8817 || code == ADDR_EXPR
8818 || code == UNARY_PLUS_EXPR
8819 || code == NEGATE_EXPR
8820 || code == PREINCREMENT_EXPR
8821 || code == PREDECREMENT_EXPR);
8824 /* An operator with this name can only be unary. */
8827 unary_op_p (enum tree_code code)
8829 return (code == TRUTH_NOT_EXPR
8830 || code == BIT_NOT_EXPR
8831 || code == COMPONENT_REF
8832 || code == TYPE_EXPR);
8835 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
8836 errors are issued for invalid declarations. */
8839 grok_op_properties (tree decl, bool complain)
8841 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
8843 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
8844 tree name = DECL_NAME (decl);
8845 enum tree_code operator_code;
8849 /* Count the number of arguments. */
8850 for (argtype = argtypes, arity = 0;
8851 argtype && argtype != void_list_node;
8852 argtype = TREE_CHAIN (argtype))
8855 class_type = DECL_CONTEXT (decl);
8856 if (class_type && !CLASS_TYPE_P (class_type))
8857 class_type = NULL_TREE;
8859 if (DECL_CONV_FN_P (decl))
8860 operator_code = TYPE_EXPR;
8864 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
8865 if (ansi_opname (CODE) == name) \
8867 operator_code = (CODE); \
8870 else if (ansi_assopname (CODE) == name) \
8872 operator_code = (CODE); \
8873 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
8877 #include "operators.def"
8883 gcc_assert (operator_code != LAST_CPLUS_TREE_CODE);
8884 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
8887 switch (operator_code)
8890 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
8894 TYPE_GETS_DELETE (class_type) |= 1;
8898 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
8901 case VEC_DELETE_EXPR:
8902 TYPE_GETS_DELETE (class_type) |= 2;
8909 /* [basic.std.dynamic.allocation]/1:
8911 A program is ill-formed if an allocation function is declared
8912 in a namespace scope other than global scope or declared static
8915 The same also holds true for deallocation functions. */
8916 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
8917 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
8919 if (DECL_NAMESPACE_SCOPE_P (decl))
8921 if (CP_DECL_CONTEXT (decl) != global_namespace)
8922 error ("%qD may not be declared within a namespace", decl);
8923 else if (!TREE_PUBLIC (decl))
8924 error ("%qD may not be declared as static", decl);
8928 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
8929 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
8930 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
8931 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
8934 /* An operator function must either be a non-static member function
8935 or have at least one parameter of a class, a reference to a class,
8936 an enumeration, or a reference to an enumeration. 13.4.0.6 */
8937 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
8939 if (operator_code == TYPE_EXPR
8940 || operator_code == CALL_EXPR
8941 || operator_code == COMPONENT_REF
8942 || operator_code == ARRAY_REF
8943 || operator_code == NOP_EXPR)
8945 error ("%qD must be a nonstatic member function", decl);
8952 if (DECL_STATIC_FUNCTION_P (decl))
8954 error ("%qD must be either a non-static member "
8955 "function or a non-member function", decl);
8959 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
8961 tree arg = non_reference (TREE_VALUE (p));
8962 /* IS_AGGR_TYPE, rather than CLASS_TYPE_P, is used
8963 because these checks are performed even on
8964 template functions. */
8965 if (IS_AGGR_TYPE (arg) || TREE_CODE (arg) == ENUMERAL_TYPE)
8969 if (!p || p == void_list_node)
8974 error ("%qD must have an argument of class or "
8981 /* There are no restrictions on the arguments to an overloaded
8983 if (operator_code == CALL_EXPR)
8986 /* Warn about conversion operators that will never be used. */
8987 if (IDENTIFIER_TYPENAME_P (name)
8988 && ! DECL_TEMPLATE_INFO (decl)
8990 /* Warn only declaring the function; there is no need to
8991 warn again about out-of-class definitions. */
8992 && class_type == current_class_type)
8994 tree t = TREE_TYPE (name);
8995 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
8996 const char *what = 0;
8999 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
9001 if (TREE_CODE (t) == VOID_TYPE)
9003 else if (class_type)
9005 if (t == class_type)
9006 what = "the same type";
9007 /* Don't force t to be complete here. */
9008 else if (IS_AGGR_TYPE (t)
9009 && COMPLETE_TYPE_P (t)
9010 && DERIVED_FROM_P (t, class_type))
9011 what = "a base class";
9015 warning (0, "conversion to %s%s will never use a type "
9016 "conversion operator",
9017 ref ? "a reference to " : "", what);
9019 if (operator_code == COND_EXPR)
9022 error ("ISO C++ prohibits overloading operator ?:");
9024 else if (ambi_op_p (operator_code))
9027 /* We pick the one-argument operator codes by default, so
9028 we don't have to change anything. */
9030 else if (arity == 2)
9032 /* If we thought this was a unary operator, we now know
9033 it to be a binary operator. */
9034 switch (operator_code)
9037 operator_code = MULT_EXPR;
9041 operator_code = BIT_AND_EXPR;
9044 case UNARY_PLUS_EXPR:
9045 operator_code = PLUS_EXPR;
9049 operator_code = MINUS_EXPR;
9052 case PREINCREMENT_EXPR:
9053 operator_code = POSTINCREMENT_EXPR;
9056 case PREDECREMENT_EXPR:
9057 operator_code = POSTDECREMENT_EXPR;
9064 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
9066 if ((operator_code == POSTINCREMENT_EXPR
9067 || operator_code == POSTDECREMENT_EXPR)
9068 && ! processing_template_decl
9069 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
9072 error ("postfix %qD must take %<int%> as its argument",
9076 ("postfix %qD must take %<int%> as its second argument",
9083 error ("%qD must take either zero or one argument", decl);
9085 error ("%qD must take either one or two arguments", decl);
9088 /* More Effective C++ rule 6. */
9090 && (operator_code == POSTINCREMENT_EXPR
9091 || operator_code == POSTDECREMENT_EXPR
9092 || operator_code == PREINCREMENT_EXPR
9093 || operator_code == PREDECREMENT_EXPR))
9095 tree arg = TREE_VALUE (argtypes);
9096 tree ret = TREE_TYPE (TREE_TYPE (decl));
9097 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
9098 arg = TREE_TYPE (arg);
9099 arg = TYPE_MAIN_VARIANT (arg);
9100 if (operator_code == PREINCREMENT_EXPR
9101 || operator_code == PREDECREMENT_EXPR)
9103 if (TREE_CODE (ret) != REFERENCE_TYPE
9104 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
9106 warning (0, "prefix %qD should return %qT", decl,
9107 build_reference_type (arg));
9111 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
9112 warning (0, "postfix %qD should return %qT", decl, arg);
9116 else if (unary_op_p (operator_code))
9121 error ("%qD must take %<void%>", decl);
9123 error ("%qD must take exactly one argument", decl);
9126 else /* if (binary_op_p (operator_code)) */
9131 error ("%qD must take exactly one argument", decl);
9133 error ("%qD must take exactly two arguments", decl);
9136 /* More Effective C++ rule 7. */
9138 && (operator_code == TRUTH_ANDIF_EXPR
9139 || operator_code == TRUTH_ORIF_EXPR
9140 || operator_code == COMPOUND_EXPR))
9141 warning (0, "user-defined %qD always evaluates both arguments",
9145 /* Effective C++ rule 23. */
9148 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
9149 && (operator_code == PLUS_EXPR
9150 || operator_code == MINUS_EXPR
9151 || operator_code == TRUNC_DIV_EXPR
9152 || operator_code == MULT_EXPR
9153 || operator_code == TRUNC_MOD_EXPR)
9154 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
9155 warning (0, "%qD should return by value", decl);
9158 for (; argtypes && argtypes != void_list_node;
9159 argtypes = TREE_CHAIN (argtypes))
9160 if (TREE_PURPOSE (argtypes))
9162 TREE_PURPOSE (argtypes) = NULL_TREE;
9163 if (operator_code == POSTINCREMENT_EXPR
9164 || operator_code == POSTDECREMENT_EXPR)
9167 pedwarn ("%qD cannot have default arguments", decl);
9170 error ("%qD cannot have default arguments", decl);
9177 /* Return a string giving the keyword associate with CODE. */
9180 tag_name (enum tag_types code)
9199 /* Name lookup in an elaborated-type-specifier (after the keyword
9200 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
9201 elaborated-type-specifier is invalid, issue a diagnostic and return
9202 error_mark_node; otherwise, return the *_TYPE to which it referred.
9203 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
9206 check_elaborated_type_specifier (enum tag_types tag_code,
9208 bool allow_template_p)
9214 struct S { struct S *p; };
9216 name lookup will find the TYPE_DECL for the implicit "S::S"
9217 typedef. Adjust for that here. */
9218 if (DECL_SELF_REFERENCE_P (decl))
9219 decl = TYPE_NAME (TREE_TYPE (decl));
9221 type = TREE_TYPE (decl);
9223 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
9224 is false for this case as well. */
9225 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
9227 error ("using template type parameter %qT after %qs",
9228 type, tag_name (tag_code));
9229 return error_mark_node;
9233 If the identifier resolves to a typedef-name or a template
9234 type-parameter, the elaborated-type-specifier is ill-formed.
9236 In other words, the only legitimate declaration to use in the
9237 elaborated type specifier is the implicit typedef created when
9238 the type is declared. */
9239 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
9240 && tag_code != typename_type)
9242 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
9243 error ("%q+D has a previous declaration here", decl);
9244 return error_mark_node;
9246 else if (TREE_CODE (type) != RECORD_TYPE
9247 && TREE_CODE (type) != UNION_TYPE
9248 && tag_code != enum_type
9249 && tag_code != typename_type)
9251 error ("%qT referred to as %qs", type, tag_name (tag_code));
9252 error ("%q+T has a previous declaration here", type);
9253 return error_mark_node;
9255 else if (TREE_CODE (type) != ENUMERAL_TYPE
9256 && tag_code == enum_type)
9258 error ("%qT referred to as enum", type);
9259 error ("%q+T has a previous declaration here", type);
9260 return error_mark_node;
9262 else if (!allow_template_p
9263 && TREE_CODE (type) == RECORD_TYPE
9264 && CLASSTYPE_IS_TEMPLATE (type))
9266 /* If a class template appears as elaborated type specifier
9267 without a template header such as:
9269 template <class T> class C {};
9270 void f(class C); // No template header here
9272 then the required template argument is missing. */
9273 error ("template argument required for %<%s %T%>",
9274 tag_name (tag_code),
9275 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
9276 return error_mark_node;
9282 /* Lookup NAME in elaborate type specifier in scope according to
9283 SCOPE and issue diagnostics if necessary.
9284 Return *_TYPE node upon success, NULL_TREE when the NAME is not
9285 found, and ERROR_MARK_NODE for type error. */
9288 lookup_and_check_tag (enum tag_types tag_code, tree name,
9289 tag_scope scope, bool template_header_p)
9293 if (scope == ts_global)
9295 /* First try ordinary name lookup, ignoring hidden class name
9296 injected via friend declaration. */
9297 decl = lookup_name_prefer_type (name, 2);
9298 /* If that fails, the name will be placed in the smallest
9299 non-class, non-function-prototype scope according to 3.3.1/5.
9300 We may already have a hidden name declared as friend in this
9301 scope. So lookup again but not ignoring hidden name.
9302 If we find one, that name will be made visible rather than
9303 creating a new tag. */
9305 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
9308 decl = lookup_type_scope (name, scope);
9310 if (decl && DECL_CLASS_TEMPLATE_P (decl))
9311 decl = DECL_TEMPLATE_RESULT (decl);
9313 if (decl && TREE_CODE (decl) == TYPE_DECL)
9315 /* Look for invalid nested type:
9319 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
9321 error ("%qD has the same name as the class in which it is "
9324 return error_mark_node;
9327 /* Two cases we need to consider when deciding if a class
9328 template is allowed as an elaborated type specifier:
9329 1. It is a self reference to its own class.
9330 2. It comes with a template header.
9334 template <class T> class C {
9335 class C *c1; // DECL_SELF_REFERENCE_P is true
9338 template <class U> class C; // template_header_p is true
9339 template <class T> class C<T>::D {
9340 class C *c2; // DECL_SELF_REFERENCE_P is true
9343 t = check_elaborated_type_specifier (tag_code,
9346 | DECL_SELF_REFERENCE_P (decl));
9353 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
9354 Define the tag as a forward-reference if it is not defined.
9356 If a declaration is given, process it here, and report an error if
9357 multiple declarations are not identical.
9359 SCOPE is TS_CURRENT when this is also a definition. Only look in
9360 the current frame for the name (since C++ allows new names in any
9361 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
9362 declaration. Only look beginning from the current scope outward up
9363 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
9365 TEMPLATE_HEADER_P is true when this declaration is preceded by
9366 a set of template parameters. */
9369 xref_tag (enum tag_types tag_code, tree name,
9370 tag_scope scope, bool template_header_p)
9372 enum tree_code code;
9374 tree context = NULL_TREE;
9376 timevar_push (TV_NAME_LOOKUP);
9378 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
9390 code = ENUMERAL_TYPE;
9396 /* In case of anonymous name, xref_tag is only called to
9397 make type node and push name. Name lookup is not required. */
9398 if (ANON_AGGRNAME_P (name))
9401 t = lookup_and_check_tag (tag_code, name,
9402 scope, template_header_p);
9404 if (t == error_mark_node)
9405 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
9407 if (scope != ts_current && t && current_class_type
9408 && template_class_depth (current_class_type)
9409 && template_header_p)
9411 /* Since SCOPE is not TS_CURRENT, we are not looking at a
9412 definition of this tag. Since, in addition, we are currently
9413 processing a (member) template declaration of a template
9414 class, we must be very careful; consider:
9421 { template <class V>
9422 friend struct S1; };
9424 Here, the S2::S1 declaration should not be confused with the
9425 outer declaration. In particular, the inner version should
9426 have a template parameter of level 2, not level 1. This
9427 would be particularly important if the member declaration
9430 template <class V = U> friend struct S1;
9432 say, when we should tsubst into `U' when instantiating
9433 S2. On the other hand, when presented with:
9443 we must find the inner binding eventually. We
9444 accomplish this by making sure that the new type we
9445 create to represent this declaration has the right
9447 context = TYPE_CONTEXT (t);
9453 /* If no such tag is yet defined, create a forward-reference node
9454 and record it as the "definition".
9455 When a real declaration of this type is found,
9456 the forward-reference will be altered into a real type. */
9457 if (code == ENUMERAL_TYPE)
9459 error ("use of enum %q#D without previous declaration", name);
9460 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
9464 t = make_aggr_type (code);
9465 TYPE_CONTEXT (t) = context;
9466 t = pushtag (name, t, scope);
9471 if (template_header_p && IS_AGGR_TYPE (t))
9472 redeclare_class_template (t, current_template_parms);
9473 else if (!processing_template_decl
9475 && CLASSTYPE_IS_TEMPLATE (t))
9477 error ("redeclaration of %qT as a non-template", t);
9478 t = error_mark_node;
9481 /* Make injected friend class visible. */
9482 if (scope != ts_within_enclosing_non_class
9483 && hidden_name_p (TYPE_NAME (t)))
9485 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
9486 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
9488 if (TYPE_TEMPLATE_INFO (t))
9490 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
9491 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
9496 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t);
9500 xref_tag_from_type (tree old, tree id, tag_scope scope)
9502 enum tag_types tag_kind;
9504 if (TREE_CODE (old) == RECORD_TYPE)
9505 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
9507 tag_kind = union_type;
9509 if (id == NULL_TREE)
9510 id = TYPE_IDENTIFIER (old);
9512 return xref_tag (tag_kind, id, scope, false);
9515 /* Create the binfo hierarchy for REF with (possibly NULL) base list
9516 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
9517 access_* node, and the TREE_VALUE is the type of the base-class.
9518 Non-NULL TREE_TYPE indicates virtual inheritance. */
9521 xref_basetypes (tree ref, tree base_list)
9524 tree binfo, base_binfo;
9525 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
9526 unsigned max_bases = 0; /* Maximum direct bases. */
9528 tree default_access;
9529 tree igo_prev; /* Track Inheritance Graph Order. */
9531 if (ref == error_mark_node)
9534 /* The base of a derived class is private by default, all others are
9536 default_access = (TREE_CODE (ref) == RECORD_TYPE
9537 && CLASSTYPE_DECLARED_CLASS (ref)
9538 ? access_private_node : access_public_node);
9540 /* First, make sure that any templates in base-classes are
9541 instantiated. This ensures that if we call ourselves recursively
9542 we do not get confused about which classes are marked and which
9547 tree basetype = TREE_VALUE (*basep);
9549 if (!(processing_template_decl && uses_template_parms (basetype))
9550 && !complete_type_or_else (basetype, NULL))
9551 /* An incomplete type. Remove it from the list. */
9552 *basep = TREE_CHAIN (*basep);
9556 if (TREE_TYPE (*basep))
9558 if (CLASS_TYPE_P (basetype))
9559 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
9560 basep = &TREE_CHAIN (*basep);
9564 TYPE_MARKED_P (ref) = 1;
9566 /* The binfo slot should be empty, unless this is an (ill-formed)
9568 gcc_assert (!TYPE_BINFO (ref) || TYPE_SIZE (ref));
9569 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
9571 binfo = make_tree_binfo (max_bases);
9573 TYPE_BINFO (ref) = binfo;
9574 BINFO_OFFSET (binfo) = size_zero_node;
9575 BINFO_TYPE (binfo) = ref;
9579 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
9580 /* An aggregate cannot have baseclasses. */
9581 CLASSTYPE_NON_AGGREGATE (ref) = 1;
9583 if (TREE_CODE (ref) == UNION_TYPE)
9584 error ("derived union %qT invalid", ref);
9589 if (TYPE_FOR_JAVA (ref))
9590 error ("Java class %qT cannot have multiple bases", ref);
9595 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
9597 if (TYPE_FOR_JAVA (ref))
9598 error ("Java class %qT cannot have virtual bases", ref);
9601 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
9603 tree access = TREE_PURPOSE (base_list);
9604 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
9605 tree basetype = TREE_VALUE (base_list);
9607 if (access == access_default_node)
9608 access = default_access;
9610 if (TREE_CODE (basetype) == TYPE_DECL)
9611 basetype = TREE_TYPE (basetype);
9612 if (TREE_CODE (basetype) != RECORD_TYPE
9613 && TREE_CODE (basetype) != TYPENAME_TYPE
9614 && TREE_CODE (basetype) != TEMPLATE_TYPE_PARM
9615 && TREE_CODE (basetype) != BOUND_TEMPLATE_TEMPLATE_PARM)
9617 error ("base type %qT fails to be a struct or class type",
9622 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
9623 TYPE_FOR_JAVA (ref) = 1;
9625 base_binfo = NULL_TREE;
9626 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
9628 base_binfo = TYPE_BINFO (basetype);
9629 /* The original basetype could have been a typedef'd type. */
9630 basetype = BINFO_TYPE (base_binfo);
9632 /* Inherit flags from the base. */
9633 TYPE_HAS_NEW_OPERATOR (ref)
9634 |= TYPE_HAS_NEW_OPERATOR (basetype);
9635 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
9636 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
9637 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
9638 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
9639 CLASSTYPE_DIAMOND_SHAPED_P (ref)
9640 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
9641 CLASSTYPE_REPEATED_BASE_P (ref)
9642 |= CLASSTYPE_REPEATED_BASE_P (basetype);
9645 /* We must do this test after we've seen through a typedef
9647 if (TYPE_MARKED_P (basetype))
9649 if (basetype == ref)
9650 error ("recursive type %qT undefined", basetype);
9652 error ("duplicate base type %qT invalid", basetype);
9655 TYPE_MARKED_P (basetype) = 1;
9657 base_binfo = copy_binfo (base_binfo, basetype, ref,
9658 &igo_prev, via_virtual);
9659 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
9660 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
9662 BINFO_BASE_APPEND (binfo, base_binfo);
9663 BINFO_BASE_ACCESS_APPEND (binfo, access);
9666 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
9667 /* If we have space in the vbase vector, we must have shared at
9668 least one of them, and are therefore diamond shaped. */
9669 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
9671 /* Unmark all the types. */
9672 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
9673 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
9674 TYPE_MARKED_P (ref) = 0;
9676 /* Now see if we have a repeated base type. */
9677 if (!CLASSTYPE_REPEATED_BASE_P (ref))
9679 for (base_binfo = binfo; base_binfo;
9680 base_binfo = TREE_CHAIN (base_binfo))
9682 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
9684 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
9687 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
9689 for (base_binfo = binfo; base_binfo;
9690 base_binfo = TREE_CHAIN (base_binfo))
9691 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
9692 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
9699 /* Begin compiling the definition of an enumeration type.
9701 Returns the type object, as yet incomplete.
9702 Also records info about it so that build_enumerator
9703 may be used to declare the individual values as they are read. */
9706 start_enum (tree name)
9710 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
9712 /* If this is the real definition for a previous forward reference,
9713 fill in the contents in the same object that used to be the
9714 forward reference. */
9716 enumtype = lookup_and_check_tag (enum_type, name,
9717 /*tag_scope=*/ts_current,
9718 /*template_header_p=*/false);
9720 if (enumtype != NULL_TREE && TREE_CODE (enumtype) == ENUMERAL_TYPE)
9722 error ("multiple definition of %q#T", enumtype);
9723 error ("%Jprevious definition here", TYPE_MAIN_DECL (enumtype));
9724 /* Clear out TYPE_VALUES, and start again. */
9725 TYPE_VALUES (enumtype) = NULL_TREE;
9729 /* In case of error, make a dummy enum to allow parsing to
9731 if (enumtype == error_mark_node)
9732 name = make_anon_name ();
9734 enumtype = make_node (ENUMERAL_TYPE);
9735 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
9741 /* After processing and defining all the values of an enumeration type,
9742 install their decls in the enumeration type and finish it off.
9743 ENUMTYPE is the type object and VALUES a list of name-value pairs. */
9746 finish_enum (tree enumtype)
9755 bool use_short_enum;
9759 integer_type_kind itk;
9760 tree underlying_type = NULL_TREE;
9762 /* We built up the VALUES in reverse order. */
9763 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
9765 /* For an enum defined in a template, just set the type of the values;
9766 all further processing is postponed until the template is
9767 instantiated. We need to set the type so that tsubst of a CONST_DECL
9769 if (processing_template_decl)
9771 for (values = TYPE_VALUES (enumtype);
9773 values = TREE_CHAIN (values))
9774 TREE_TYPE (TREE_VALUE (values)) = enumtype;
9775 if (at_function_scope_p ())
9776 add_stmt (build_min (TAG_DEFN, enumtype));
9780 /* Determine the minimum and maximum values of the enumerators. */
9781 if (TYPE_VALUES (enumtype))
9783 minnode = maxnode = NULL_TREE;
9785 for (values = TYPE_VALUES (enumtype);
9787 values = TREE_CHAIN (values))
9789 decl = TREE_VALUE (values);
9791 /* [dcl.enum]: Following the closing brace of an enum-specifier,
9792 each enumerator has the type of its enumeration. Prior to the
9793 closing brace, the type of each enumerator is the type of its
9794 initializing value. */
9795 TREE_TYPE (decl) = enumtype;
9797 /* Update the minimum and maximum values, if appropriate. */
9798 value = DECL_INITIAL (decl);
9799 if (value == error_mark_node)
9800 value = integer_zero_node;
9801 /* Figure out what the minimum and maximum values of the
9804 minnode = maxnode = value;
9805 else if (tree_int_cst_lt (maxnode, value))
9807 else if (tree_int_cst_lt (value, minnode))
9814 If the enumerator-list is empty, the underlying type is as if
9815 the enumeration had a single enumerator with value 0. */
9816 minnode = maxnode = integer_zero_node;
9818 /* Compute the number of bits require to represent all values of the
9819 enumeration. We must do this before the type of MINNODE and
9820 MAXNODE are transformed, since min_precision relies on the
9821 TREE_TYPE of the value it is passed. */
9822 unsignedp = tree_int_cst_sgn (minnode) >= 0;
9823 lowprec = min_precision (minnode, unsignedp);
9824 highprec = min_precision (maxnode, unsignedp);
9825 precision = MAX (lowprec, highprec);
9827 /* Determine the underlying type of the enumeration.
9831 The underlying type of an enumeration is an integral type that
9832 can represent all the enumerator values defined in the
9833 enumeration. It is implementation-defined which integral type is
9834 used as the underlying type for an enumeration except that the
9835 underlying type shall not be larger than int unless the value of
9836 an enumerator cannot fit in an int or unsigned int.
9838 We use "int" or an "unsigned int" as the underlying type, even if
9839 a smaller integral type would work, unless the user has
9840 explicitly requested that we use the smallest possible type. The
9841 user can request that for all enumerations with a command line
9842 flag, or for just one enumeration with an attribute. */
9844 use_short_enum = flag_short_enums
9845 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
9847 for (itk = (use_short_enum ? itk_char : itk_int);
9851 underlying_type = integer_types[itk];
9852 if (TYPE_PRECISION (underlying_type) >= precision
9853 && TYPE_UNSIGNED (underlying_type) == unsignedp)
9856 if (itk == itk_none)
9860 IF no integral type can represent all the enumerator values, the
9861 enumeration is ill-formed. */
9862 error ("no integral type can represent all of the enumerator values "
9863 "for %qT", enumtype);
9864 precision = TYPE_PRECISION (long_long_integer_type_node);
9865 underlying_type = integer_types[itk_unsigned_long_long];
9868 /* Compute the minium and maximum values for the type.
9872 For an enumeration where emin is the smallest enumerator and emax
9873 is the largest, the values of the enumeration are the values of the
9874 underlying type in the range bmin to bmax, where bmin and bmax are,
9875 respectively, the smallest and largest values of the smallest bit-
9876 field that can store emin and emax. */
9878 /* The middle-end currently assumes that types with TYPE_PRECISION
9879 narrower than their underlying type are suitably zero or sign
9880 extended to fill their mode. g++ doesn't make these guarantees.
9881 Until the middle-end can represent such paradoxical types, we
9882 set the TYPE_PRECISION to the width of the underlying type. */
9883 TYPE_PRECISION (enumtype) = TYPE_PRECISION (underlying_type);
9885 set_min_and_max_values_for_integral_type (enumtype, precision, unsignedp);
9889 The value of sizeof() applied to an enumeration type, an object
9890 of an enumeration type, or an enumerator, is the value of sizeof()
9891 applied to the underlying type. */
9892 TYPE_SIZE (enumtype) = TYPE_SIZE (underlying_type);
9893 TYPE_SIZE_UNIT (enumtype) = TYPE_SIZE_UNIT (underlying_type);
9894 TYPE_MODE (enumtype) = TYPE_MODE (underlying_type);
9895 TYPE_ALIGN (enumtype) = TYPE_ALIGN (underlying_type);
9896 TYPE_USER_ALIGN (enumtype) = TYPE_USER_ALIGN (underlying_type);
9897 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (underlying_type);
9899 /* Convert each of the enumerators to the type of the underlying
9900 type of the enumeration. */
9901 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
9903 location_t saved_location;
9905 decl = TREE_VALUE (values);
9906 saved_location = input_location;
9907 input_location = DECL_SOURCE_LOCATION (decl);
9908 value = perform_implicit_conversion (underlying_type,
9909 DECL_INITIAL (decl));
9910 input_location = saved_location;
9912 /* Do not clobber shared ints. */
9913 value = copy_node (value);
9915 TREE_TYPE (value) = enumtype;
9916 DECL_INITIAL (decl) = value;
9917 TREE_VALUE (values) = value;
9920 /* Fix up all variant types of this enum type. */
9921 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
9923 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
9924 TYPE_MIN_VALUE (t) = TYPE_MIN_VALUE (enumtype);
9925 TYPE_MAX_VALUE (t) = TYPE_MAX_VALUE (enumtype);
9926 TYPE_SIZE (t) = TYPE_SIZE (enumtype);
9927 TYPE_SIZE_UNIT (t) = TYPE_SIZE_UNIT (enumtype);
9928 TYPE_MODE (t) = TYPE_MODE (enumtype);
9929 TYPE_PRECISION (t) = TYPE_PRECISION (enumtype);
9930 TYPE_ALIGN (t) = TYPE_ALIGN (enumtype);
9931 TYPE_USER_ALIGN (t) = TYPE_USER_ALIGN (enumtype);
9932 TYPE_UNSIGNED (t) = TYPE_UNSIGNED (enumtype);
9935 /* Finish debugging output for this type. */
9936 rest_of_type_compilation (enumtype, namespace_bindings_p ());
9939 /* Build and install a CONST_DECL for an enumeration constant of the
9940 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
9941 Assignment of sequential values by default is handled here. */
9944 build_enumerator (tree name, tree value, tree enumtype)
9950 /* If the VALUE was erroneous, pretend it wasn't there; that will
9951 result in the enum being assigned the next value in sequence. */
9952 if (value == error_mark_node)
9955 /* Remove no-op casts from the value. */
9957 STRIP_TYPE_NOPS (value);
9959 if (! processing_template_decl)
9961 /* Validate and default VALUE. */
9962 if (value != NULL_TREE)
9964 value = integral_constant_value (value);
9966 if (TREE_CODE (value) == INTEGER_CST)
9968 value = perform_integral_promotions (value);
9969 constant_expression_warning (value);
9973 error ("enumerator value for %qD not integer constant", name);
9978 /* Default based on previous value. */
9979 if (value == NULL_TREE)
9981 if (TYPE_VALUES (enumtype))
9984 unsigned HOST_WIDE_INT lo;
9988 /* The next value is the previous value plus one. We can
9989 safely assume that the previous value is an INTEGER_CST.
9990 add_double doesn't know the type of the target expression,
9991 so we must check with int_fits_type_p as well. */
9992 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
9993 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
9994 TREE_INT_CST_HIGH (prev_value),
9996 value = build_int_cst_wide (TREE_TYPE (prev_value), lo, hi);
9997 overflowed |= !int_fits_type_p (value, TREE_TYPE (prev_value));
10001 error ("overflow in enumeration values at %qD", name);
10002 value = error_mark_node;
10006 value = integer_zero_node;
10009 /* Remove no-op casts from the value. */
10010 STRIP_TYPE_NOPS (value);
10013 /* C++ associates enums with global, function, or class declarations. */
10014 context = current_scope ();
10016 /* Build the actual enumeration constant. Note that the enumeration
10017 constants have the type of their initializers until the
10018 enumeration is complete:
10022 Following the closing brace of an enum-specifier, each enumer-
10023 ator has the type of its enumeration. Prior to the closing
10024 brace, the type of each enumerator is the type of its
10025 initializing value.
10027 In finish_enum we will reset the type. Of course, if we're
10028 processing a template, there may be no value. */
10029 type = value ? TREE_TYPE (value) : NULL_TREE;
10031 if (context && context == current_class_type)
10032 /* This enum declaration is local to the class. We need the full
10033 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
10034 decl = build_lang_decl (CONST_DECL, name, type);
10036 /* It's a global enum, or it's local to a function. (Note local to
10037 a function could mean local to a class method. */
10038 decl = build_decl (CONST_DECL, name, type);
10040 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
10041 TREE_CONSTANT (decl) = 1;
10042 TREE_INVARIANT (decl) = 1;
10043 TREE_READONLY (decl) = 1;
10044 DECL_INITIAL (decl) = value;
10046 if (context && context == current_class_type)
10047 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
10048 on the TYPE_FIELDS list for `S'. (That's so that you can say
10049 things like `S::i' later.) */
10050 finish_member_declaration (decl);
10054 /* Add this enumeration constant to the list for this type. */
10055 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
10059 /* We're defining DECL. Make sure that it's type is OK. */
10062 check_function_type (tree decl, tree current_function_parms)
10064 tree fntype = TREE_TYPE (decl);
10065 tree return_type = complete_type (TREE_TYPE (fntype));
10067 /* In a function definition, arg types must be complete. */
10068 require_complete_types_for_parms (current_function_parms);
10070 if (dependent_type_p (return_type))
10072 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
10074 tree args = TYPE_ARG_TYPES (fntype);
10076 error ("return type %q#T is incomplete", return_type);
10078 /* Make it return void instead. */
10079 if (TREE_CODE (fntype) == METHOD_TYPE)
10080 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
10082 TREE_CHAIN (args));
10084 fntype = build_function_type (void_type_node, args);
10086 = build_exception_variant (fntype,
10087 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
10090 abstract_virtuals_error (decl, TREE_TYPE (fntype));
10093 /* Create the FUNCTION_DECL for a function definition.
10094 DECLSPECS and DECLARATOR are the parts of the declaration;
10095 they describe the function's name and the type it returns,
10096 but twisted together in a fashion that parallels the syntax of C.
10098 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
10099 DECLARATOR is really the DECL for the function we are about to
10100 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
10101 indicating that the function is an inline defined in-class.
10103 This function creates a binding context for the function body
10104 as well as setting up the FUNCTION_DECL in current_function_decl.
10106 For C++, we must first check whether that datum makes any sense.
10107 For example, "class A local_a(1,2);" means that variable local_a
10108 is an aggregate of type A, which should have a constructor
10109 applied to it with the argument list [1, 2]. */
10112 start_preparsed_function (tree decl1, tree attrs, int flags)
10114 tree ctype = NULL_TREE;
10117 int doing_friend = 0;
10118 struct cp_binding_level *bl;
10119 tree current_function_parms;
10120 struct c_fileinfo *finfo
10121 = get_fileinfo (lbasename (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1))));
10122 bool honor_interface;
10124 /* Sanity check. */
10125 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
10126 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
10128 fntype = TREE_TYPE (decl1);
10129 if (TREE_CODE (fntype) == METHOD_TYPE)
10130 ctype = TYPE_METHOD_BASETYPE (fntype);
10132 /* ISO C++ 11.4/5. A friend function defined in a class is in
10133 the (lexical) scope of the class in which it is defined. */
10134 if (!ctype && DECL_FRIEND_P (decl1))
10136 ctype = DECL_FRIEND_CONTEXT (decl1);
10138 /* CTYPE could be null here if we're dealing with a template;
10139 for example, `inline friend float foo()' inside a template
10140 will have no CTYPE set. */
10141 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
10147 if (DECL_DECLARED_INLINE_P (decl1)
10148 && lookup_attribute ("noinline", attrs))
10149 warning (0, "inline function %q+D given attribute noinline", decl1);
10151 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
10152 /* This is a constructor, we must ensure that any default args
10153 introduced by this definition are propagated to the clones
10154 now. The clones are used directly in overload resolution. */
10155 adjust_clone_args (decl1);
10157 /* Sometimes we don't notice that a function is a static member, and
10158 build a METHOD_TYPE for it. Fix that up now. */
10159 if (ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
10160 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE)
10162 revert_static_member_fn (decl1);
10166 /* Set up current_class_type, and enter the scope of the class, if
10169 push_nested_class (ctype);
10170 else if (DECL_STATIC_FUNCTION_P (decl1))
10171 push_nested_class (DECL_CONTEXT (decl1));
10173 /* Now that we have entered the scope of the class, we must restore
10174 the bindings for any template parameters surrounding DECL1, if it
10175 is an inline member template. (Order is important; consider the
10176 case where a template parameter has the same name as a field of
10177 the class.) It is not until after this point that
10178 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
10179 if (flags & SF_INCLASS_INLINE)
10180 maybe_begin_member_template_processing (decl1);
10182 /* Effective C++ rule 15. */
10184 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
10185 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
10186 warning (0, "%<operator=%> should return a reference to %<*this%>");
10188 /* Make the init_value nonzero so pushdecl knows this is not tentative.
10189 error_mark_node is replaced below (in poplevel) with the BLOCK. */
10190 if (!DECL_INITIAL (decl1))
10191 DECL_INITIAL (decl1) = error_mark_node;
10193 /* This function exists in static storage.
10194 (This does not mean `static' in the C sense!) */
10195 TREE_STATIC (decl1) = 1;
10197 /* We must call push_template_decl after current_class_type is set
10198 up. (If we are processing inline definitions after exiting a
10199 class scope, current_class_type will be NULL_TREE until set above
10200 by push_nested_class.) */
10201 if (processing_template_decl)
10203 /* FIXME: Handle error_mark_node more gracefully. */
10204 tree newdecl1 = push_template_decl (decl1);
10205 if (newdecl1 != error_mark_node)
10209 /* We are now in the scope of the function being defined. */
10210 current_function_decl = decl1;
10212 /* Save the parm names or decls from this function's declarator
10213 where store_parm_decls will find them. */
10214 current_function_parms = DECL_ARGUMENTS (decl1);
10216 /* Make sure the parameter and return types are reasonable. When
10217 you declare a function, these types can be incomplete, but they
10218 must be complete when you define the function. */
10219 check_function_type (decl1, current_function_parms);
10221 /* Build the return declaration for the function. */
10222 restype = TREE_TYPE (fntype);
10223 /* Promote the value to int before returning it. */
10224 if (c_promoting_integer_type_p (restype))
10225 restype = type_promotes_to (restype);
10226 if (DECL_RESULT (decl1) == NULL_TREE)
10230 resdecl = build_decl (RESULT_DECL, 0, TYPE_MAIN_VARIANT (restype));
10231 DECL_ARTIFICIAL (resdecl) = 1;
10232 DECL_IGNORED_P (resdecl) = 1;
10233 DECL_RESULT (decl1) = resdecl;
10235 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
10238 /* Initialize RTL machinery. We cannot do this until
10239 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
10240 even when processing a template; this is how we get
10241 CFUN set up, and our per-function variables initialized.
10242 FIXME factor out the non-RTL stuff. */
10243 bl = current_binding_level;
10244 allocate_struct_function (decl1);
10245 current_binding_level = bl;
10247 /* Even though we're inside a function body, we still don't want to
10248 call expand_expr to calculate the size of a variable-sized array.
10249 We haven't necessarily assigned RTL to all variables yet, so it's
10250 not safe to try to expand expressions involving them. */
10251 cfun->x_dont_save_pending_sizes_p = 1;
10253 /* Start the statement-tree, start the tree now. */
10254 DECL_SAVED_TREE (decl1) = push_stmt_list ();
10256 /* Let the user know we're compiling this function. */
10257 announce_function (decl1);
10259 /* Record the decl so that the function name is defined.
10260 If we already have a decl for this name, and it is a FUNCTION_DECL,
10261 use the old decl. */
10262 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
10264 /* A specialization is not used to guide overload resolution. */
10265 if (!DECL_FUNCTION_MEMBER_P (decl1)
10266 && !(DECL_USE_TEMPLATE (decl1) &&
10267 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
10269 tree olddecl = pushdecl (decl1);
10271 if (olddecl == error_mark_node)
10272 /* If something went wrong when registering the declaration,
10273 use DECL1; we have to have a FUNCTION_DECL to use when
10274 parsing the body of the function. */
10277 /* Otherwise, OLDDECL is either a previous declaration of
10278 the same function or DECL1 itself. */
10283 /* We need to set the DECL_CONTEXT. */
10284 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
10285 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
10286 /* And make sure we have enough default args. */
10287 check_default_args (decl1);
10289 fntype = TREE_TYPE (decl1);
10292 /* Determine the ELF visibility attribute for the function. We must
10293 not do this before calling "pushdecl", as we must allow
10294 "duplicate_decls" to merge any attributes appropriately. */
10295 if (!DECL_CLONED_FUNCTION_P (decl1))
10296 determine_visibility (decl1);
10298 /* Reset these in case the call to pushdecl changed them. */
10299 current_function_decl = decl1;
10300 cfun->decl = decl1;
10302 /* If we are (erroneously) defining a function that we have already
10303 defined before, wipe out what we knew before. */
10304 if (!DECL_PENDING_INLINE_P (decl1))
10305 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
10307 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
10309 /* We know that this was set up by `grokclassfn'. We do not
10310 wait until `store_parm_decls', since evil parse errors may
10311 never get us to that point. Here we keep the consistency
10312 between `current_class_type' and `current_class_ptr'. */
10313 tree t = DECL_ARGUMENTS (decl1);
10315 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
10316 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
10318 cp_function_chain->x_current_class_ref
10319 = build_indirect_ref (t, NULL);
10320 cp_function_chain->x_current_class_ptr = t;
10322 /* Constructors and destructors need to know whether they're "in
10323 charge" of initializing virtual base classes. */
10324 t = TREE_CHAIN (t);
10325 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
10327 current_in_charge_parm = t;
10328 t = TREE_CHAIN (t);
10330 if (DECL_HAS_VTT_PARM_P (decl1))
10332 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
10333 current_vtt_parm = t;
10337 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
10338 /* Implicitly-defined methods (like the
10339 destructor for a class in which no destructor
10340 is explicitly declared) must not be defined
10341 until their definition is needed. So, we
10342 ignore interface specifications for
10343 compiler-generated functions. */
10344 && !DECL_ARTIFICIAL (decl1));
10346 if (DECL_INTERFACE_KNOWN (decl1))
10348 tree ctx = decl_function_context (decl1);
10350 if (DECL_NOT_REALLY_EXTERN (decl1))
10351 DECL_EXTERNAL (decl1) = 0;
10353 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
10354 && TREE_PUBLIC (ctx))
10355 /* This is a function in a local class in an extern inline
10357 comdat_linkage (decl1);
10359 /* If this function belongs to an interface, it is public.
10360 If it belongs to someone else's interface, it is also external.
10361 This only affects inlines and template instantiations. */
10362 else if (!finfo->interface_unknown && honor_interface)
10364 if (DECL_DECLARED_INLINE_P (decl1)
10365 || DECL_TEMPLATE_INSTANTIATION (decl1)
10366 || processing_template_decl)
10368 DECL_EXTERNAL (decl1)
10369 = (finfo->interface_only
10370 || (DECL_DECLARED_INLINE_P (decl1)
10371 && ! flag_implement_inlines
10372 && !DECL_VINDEX (decl1)));
10374 /* For WIN32 we also want to put these in linkonce sections. */
10375 maybe_make_one_only (decl1);
10378 DECL_EXTERNAL (decl1) = 0;
10379 DECL_INTERFACE_KNOWN (decl1) = 1;
10380 /* If this function is in an interface implemented in this file,
10381 make sure that the backend knows to emit this function
10383 if (!DECL_EXTERNAL (decl1))
10384 mark_needed (decl1);
10386 else if (finfo->interface_unknown && finfo->interface_only
10387 && honor_interface)
10389 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
10390 interface, we will have both finfo->interface_unknown and
10391 finfo->interface_only set. In that case, we don't want to
10392 use the normal heuristics because someone will supply a
10393 #pragma implementation elsewhere, and deducing it here would
10394 produce a conflict. */
10395 comdat_linkage (decl1);
10396 DECL_EXTERNAL (decl1) = 0;
10397 DECL_INTERFACE_KNOWN (decl1) = 1;
10398 DECL_DEFER_OUTPUT (decl1) = 1;
10402 /* This is a definition, not a reference.
10403 So clear DECL_EXTERNAL. */
10404 DECL_EXTERNAL (decl1) = 0;
10406 if ((DECL_DECLARED_INLINE_P (decl1)
10407 || DECL_TEMPLATE_INSTANTIATION (decl1))
10408 && ! DECL_INTERFACE_KNOWN (decl1)
10409 /* Don't try to defer nested functions for now. */
10410 && ! decl_function_context (decl1))
10411 DECL_DEFER_OUTPUT (decl1) = 1;
10413 DECL_INTERFACE_KNOWN (decl1) = 1;
10416 begin_scope (sk_function_parms, decl1);
10420 if (DECL_DESTRUCTOR_P (decl1)
10421 || (DECL_CONSTRUCTOR_P (decl1)
10422 && targetm.cxx.cdtor_returns_this ()))
10424 cdtor_label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
10425 DECL_CONTEXT (cdtor_label) = current_function_decl;
10428 start_fname_decls ();
10430 store_parm_decls (current_function_parms);
10434 /* Like start_preparsed_function, except that instead of a
10435 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
10437 Returns 1 on success. If the DECLARATOR is not suitable for a function
10438 (it defines a datum instead), we return 0, which tells
10439 yyparse to report a parse error. */
10442 start_function (cp_decl_specifier_seq *declspecs,
10443 const cp_declarator *declarator,
10448 if (have_extern_spec)
10450 declspecs->storage_class = sc_extern;
10451 /* This should only be done once on the outermost decl. */
10452 have_extern_spec = false;
10455 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
10456 /* If the declarator is not suitable for a function definition,
10457 cause a syntax error. */
10458 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
10461 /* If #pragma weak was used, mark the decl weak now. */
10462 if (global_scope_p (current_binding_level))
10463 maybe_apply_pragma_weak (decl1);
10465 if (DECL_MAIN_P (decl1))
10466 /* main must return int. grokfndecl should have corrected it
10467 (and issued a diagnostic) if the user got it wrong. */
10468 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
10469 integer_type_node));
10471 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
10476 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
10480 use_eh_spec_block (tree fn)
10482 return (flag_exceptions && flag_enforce_eh_specs
10483 && !processing_template_decl
10484 && TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn))
10485 /* We insert the EH_SPEC_BLOCK only in the original
10486 function; then, it is copied automatically to the
10488 && !DECL_CLONED_FUNCTION_P (fn)
10489 /* Implicitly-generated constructors and destructors have
10490 exception specifications. However, those specifications
10491 are the union of the possible exceptions specified by the
10492 constructors/destructors for bases and members, so no
10493 unallowed exception will ever reach this function. By
10494 not creating the EH_SPEC_BLOCK we save a little memory,
10495 and we avoid spurious warnings about unreachable
10497 && !DECL_ARTIFICIAL (fn));
10500 /* Store the parameter declarations into the current function declaration.
10501 This is called after parsing the parameter declarations, before
10502 digesting the body of the function.
10504 Also install to binding contour return value identifier, if any. */
10507 store_parm_decls (tree current_function_parms)
10509 tree fndecl = current_function_decl;
10512 /* This is a chain of any other decls that came in among the parm
10513 declarations. If a parm is declared with enum {foo, bar} x;
10514 then CONST_DECLs for foo and bar are put here. */
10515 tree nonparms = NULL_TREE;
10517 if (current_function_parms)
10519 /* This case is when the function was defined with an ANSI prototype.
10520 The parms already have decls, so we need not do anything here
10521 except record them as in effect
10522 and complain if any redundant old-style parm decls were written. */
10524 tree specparms = current_function_parms;
10527 /* Must clear this because it might contain TYPE_DECLs declared
10529 current_binding_level->names = NULL;
10531 /* If we're doing semantic analysis, then we'll call pushdecl
10532 for each of these. We must do them in reverse order so that
10533 they end in the correct forward order. */
10534 specparms = nreverse (specparms);
10536 for (parm = specparms; parm; parm = next)
10538 next = TREE_CHAIN (parm);
10539 if (TREE_CODE (parm) == PARM_DECL)
10541 if (DECL_NAME (parm) == NULL_TREE
10542 || TREE_CODE (parm) != VOID_TYPE)
10545 error ("parameter %qD declared void", parm);
10549 /* If we find an enum constant or a type tag,
10550 put it aside for the moment. */
10551 TREE_CHAIN (parm) = NULL_TREE;
10552 nonparms = chainon (nonparms, parm);
10556 /* Get the decls in their original chain order and record in the
10557 function. This is all and only the PARM_DECLs that were
10558 pushed into scope by the loop above. */
10559 DECL_ARGUMENTS (fndecl) = getdecls ();
10562 DECL_ARGUMENTS (fndecl) = NULL_TREE;
10564 /* Now store the final chain of decls for the arguments
10565 as the decl-chain of the current lexical scope.
10566 Put the enumerators in as well, at the front so that
10567 DECL_ARGUMENTS is not modified. */
10568 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
10570 if (use_eh_spec_block (current_function_decl))
10571 current_eh_spec_block = begin_eh_spec_block ();
10575 /* We have finished doing semantic analysis on DECL, but have not yet
10576 generated RTL for its body. Save away our current state, so that
10577 when we want to generate RTL later we know what to do. */
10580 save_function_data (tree decl)
10582 struct language_function *f;
10584 /* Save the language-specific per-function data so that we can
10585 get it back when we really expand this function. */
10586 gcc_assert (!DECL_PENDING_INLINE_P (decl));
10589 f = GGC_NEW (struct language_function);
10590 memcpy (f, cp_function_chain, sizeof (struct language_function));
10591 DECL_SAVED_FUNCTION_DATA (decl) = f;
10593 /* Clear out the bits we don't need. */
10594 f->base.x_stmt_tree.x_cur_stmt_list = NULL_TREE;
10595 f->x_named_label_uses = NULL;
10596 f->bindings = NULL;
10597 f->x_local_names = NULL;
10601 /* Set the return value of the constructor (if present). */
10604 finish_constructor_body (void)
10609 if (targetm.cxx.cdtor_returns_this ())
10611 /* Any return from a constructor will end up here. */
10612 add_stmt (build_stmt (LABEL_EXPR, cdtor_label));
10614 val = DECL_ARGUMENTS (current_function_decl);
10615 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
10616 DECL_RESULT (current_function_decl), val);
10617 /* Return the address of the object. */
10618 exprstmt = build_stmt (RETURN_EXPR, val);
10619 add_stmt (exprstmt);
10623 /* Do all the processing for the beginning of a destructor; set up the
10624 vtable pointers and cleanups for bases and members. */
10627 begin_destructor_body (void)
10629 tree compound_stmt;
10631 compound_stmt = begin_compound_stmt (0);
10633 /* Make all virtual function table pointers in non-virtual base
10634 classes point to CURRENT_CLASS_TYPE's virtual function
10636 initialize_vtbl_ptrs (current_class_ptr);
10638 finish_compound_stmt (compound_stmt);
10640 /* And insert cleanups for our bases and members so that they
10641 will be properly destroyed if we throw. */
10642 push_base_cleanups ();
10645 /* At the end of every destructor we generate code to delete the object if
10646 necessary. Do that now. */
10649 finish_destructor_body (void)
10653 /* Any return from a destructor will end up here; that way all base
10654 and member cleanups will be run when the function returns. */
10655 add_stmt (build_stmt (LABEL_EXPR, cdtor_label));
10657 /* In a virtual destructor, we must call delete. */
10658 if (DECL_VIRTUAL_P (current_function_decl))
10661 tree virtual_size = cxx_sizeof (current_class_type);
10665 At the point of definition of a virtual destructor (including
10666 an implicit definition), non-placement operator delete shall
10667 be looked up in the scope of the destructor's class and if
10668 found shall be accessible and unambiguous. */
10669 exprstmt = build_op_delete_call
10670 (DELETE_EXPR, current_class_ptr, virtual_size,
10671 /*global_p=*/false, NULL_TREE);
10673 if_stmt = begin_if_stmt ();
10674 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
10675 current_in_charge_parm,
10678 finish_expr_stmt (exprstmt);
10679 finish_then_clause (if_stmt);
10680 finish_if_stmt (if_stmt);
10683 if (targetm.cxx.cdtor_returns_this ())
10687 val = DECL_ARGUMENTS (current_function_decl);
10688 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
10689 DECL_RESULT (current_function_decl), val);
10690 /* Return the address of the object. */
10691 exprstmt = build_stmt (RETURN_EXPR, val);
10692 add_stmt (exprstmt);
10696 /* Do the necessary processing for the beginning of a function body, which
10697 in this case includes member-initializers, but not the catch clauses of
10698 a function-try-block. Currently, this means opening a binding level
10699 for the member-initializers (in a ctor) and member cleanups (in a dtor). */
10702 begin_function_body (void)
10706 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
10709 if (processing_template_decl)
10710 /* Do nothing now. */;
10712 /* Always keep the BLOCK node associated with the outermost pair of
10713 curly braces of a function. These are needed for correct
10714 operation of dwarfout.c. */
10715 keep_next_level (true);
10717 stmt = begin_compound_stmt (BCS_FN_BODY);
10719 if (processing_template_decl)
10720 /* Do nothing now. */;
10721 else if (DECL_DESTRUCTOR_P (current_function_decl))
10722 begin_destructor_body ();
10727 /* Do the processing for the end of a function body. Currently, this means
10728 closing out the cleanups for fully-constructed bases and members, and in
10729 the case of the destructor, deleting the object if desired. Again, this
10730 is only meaningful for [cd]tors, since they are the only functions where
10731 there is a significant distinction between the main body and any
10732 function catch clauses. Handling, say, main() return semantics here
10733 would be wrong, as flowing off the end of a function catch clause for
10734 main() would also need to return 0. */
10737 finish_function_body (tree compstmt)
10739 if (compstmt == NULL_TREE)
10742 /* Close the block. */
10743 finish_compound_stmt (compstmt);
10745 if (processing_template_decl)
10746 /* Do nothing now. */;
10747 else if (DECL_CONSTRUCTOR_P (current_function_decl))
10748 finish_constructor_body ();
10749 else if (DECL_DESTRUCTOR_P (current_function_decl))
10750 finish_destructor_body ();
10753 /* Given a function, returns the BLOCK corresponding to the outermost level
10754 of curly braces, skipping the artificial block created for constructor
10758 outer_curly_brace_block (tree fndecl)
10760 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
10761 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
10762 /* Skip the artificial function body block. */
10763 block = BLOCK_SUBBLOCKS (block);
10767 /* Finish up a function declaration and compile that function
10768 all the way to assembler language output. The free the storage
10769 for the function definition.
10771 FLAGS is a bitwise or of the following values:
10773 We just finished processing the body of an in-class inline
10774 function definition. (This processing will have taken place
10775 after the class definition is complete.) */
10778 finish_function (int flags)
10780 tree fndecl = current_function_decl;
10781 tree fntype, ctype = NULL_TREE;
10782 int inclass_inline = (flags & 2) != 0;
10785 /* When we get some parse errors, we can end up without a
10786 current_function_decl, so cope. */
10787 if (fndecl == NULL_TREE)
10788 return error_mark_node;
10790 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
10791 && DECL_VIRTUAL_P (fndecl)
10792 && !processing_template_decl)
10794 tree fnclass = DECL_CONTEXT (fndecl);
10795 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
10796 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
10799 nested = function_depth > 1;
10800 fntype = TREE_TYPE (fndecl);
10802 /* TREE_READONLY (fndecl) = 1;
10803 This caused &foo to be of type ptr-to-const-function
10804 which then got a warning when stored in a ptr-to-function variable. */
10806 gcc_assert (building_stmt_tree ());
10808 /* For a cloned function, we've already got all the code we need;
10809 there's no need to add any extra bits. */
10810 if (!DECL_CLONED_FUNCTION_P (fndecl))
10812 if (DECL_MAIN_P (current_function_decl))
10816 /* Make it so that `main' always returns 0 by default (or
10819 stmt = finish_return_stmt (integer_one_node);
10821 stmt = finish_return_stmt (integer_zero_node);
10823 /* Hack. We don't want the middle-end to warn that this
10824 return is unreachable, so put the statement on the
10826 #ifdef USE_MAPPED_LOCATION
10827 SET_EXPR_LOCATION (stmt, UNKNOWN_LOCATION);
10829 annotate_with_file_line (stmt, input_filename, 0);
10833 if (use_eh_spec_block (current_function_decl))
10834 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
10835 (TREE_TYPE (current_function_decl)),
10836 current_eh_spec_block);
10839 /* If we're saving up tree structure, tie off the function now. */
10840 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
10842 finish_fname_decls ();
10844 /* If this function can't throw any exceptions, remember that. */
10845 if (!processing_template_decl
10846 && !cp_function_chain->can_throw
10847 && !flag_non_call_exceptions)
10848 TREE_NOTHROW (fndecl) = 1;
10850 /* This must come after expand_function_end because cleanups might
10851 have declarations (from inline functions) that need to go into
10852 this function's blocks. */
10854 /* If the current binding level isn't the outermost binding level
10855 for this function, either there is a bug, or we have experienced
10856 syntax errors and the statement tree is malformed. */
10857 if (current_binding_level->kind != sk_function_parms)
10859 /* Make sure we have already experienced errors. */
10860 gcc_assert (errorcount);
10862 /* Throw away the broken statement tree and extra binding
10864 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
10866 while (current_binding_level->kind != sk_function_parms)
10868 if (current_binding_level->kind == sk_class)
10869 pop_nested_class ();
10871 poplevel (0, 0, 0);
10874 poplevel (1, 0, 1);
10876 /* Statements should always be full-expressions at the outermost set
10877 of curly braces for a function. */
10878 gcc_assert (stmts_are_full_exprs_p ());
10880 /* Set up the named return value optimization, if we can. Candidate
10881 variables are selected in check_return_value. */
10882 if (current_function_return_value)
10884 tree r = current_function_return_value;
10887 if (r != error_mark_node
10888 /* This is only worth doing for fns that return in memory--and
10889 simpler, since we don't have to worry about promoted modes. */
10890 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
10891 /* Only allow this for variables declared in the outer scope of
10892 the function so we know that their lifetime always ends with a
10893 return; see g++.dg/opt/nrv6.C. We could be more flexible if
10894 we were to do this optimization in tree-ssa. */
10895 && (outer = outer_curly_brace_block (fndecl))
10896 && chain_member (r, BLOCK_VARS (outer)))
10897 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
10899 current_function_return_value = NULL_TREE;
10902 /* Remember that we were in class scope. */
10903 if (current_class_name)
10904 ctype = current_class_type;
10906 /* Must mark the RESULT_DECL as being in this function. */
10907 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
10909 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
10910 to the FUNCTION_DECL node itself. */
10911 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
10913 /* Save away current state, if appropriate. */
10914 if (!processing_template_decl)
10915 save_function_data (fndecl);
10917 /* Complain if there's just no return statement. */
10918 if (warn_return_type
10919 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
10920 && !dependent_type_p (TREE_TYPE (fntype))
10921 && !current_function_returns_value && !current_function_returns_null
10922 /* Don't complain if we abort or throw. */
10923 && !current_function_returns_abnormally
10924 && !DECL_NAME (DECL_RESULT (fndecl))
10925 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
10926 inline function, as we might never be compiled separately. */
10927 && (DECL_INLINE (fndecl) || processing_template_decl)
10928 /* Structor return values (if any) are set by the compiler. */
10929 && !DECL_CONSTRUCTOR_P (fndecl)
10930 && !DECL_DESTRUCTOR_P (fndecl))
10931 warning (0, "no return statement in function returning non-void");
10933 /* Store the end of the function, so that we get good line number
10934 info for the epilogue. */
10935 cfun->function_end_locus = input_location;
10937 /* Genericize before inlining. */
10938 if (!processing_template_decl)
10940 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
10941 cp_genericize (fndecl);
10942 /* Clear out the bits we don't need. */
10943 f->x_current_class_ptr = NULL;
10944 f->x_current_class_ref = NULL;
10945 f->x_eh_spec_block = NULL;
10946 f->x_in_charge_parm = NULL;
10947 f->x_vtt_parm = NULL;
10948 f->x_return_value = NULL;
10949 f->bindings = NULL;
10951 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
10952 c_warn_unused_result (&DECL_SAVED_TREE (fndecl));
10954 /* Clear out the bits we don't need. */
10955 local_names = NULL;
10956 named_label_uses = NULL;
10958 /* We're leaving the context of this function, so zap cfun. It's still in
10959 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
10961 current_function_decl = NULL;
10963 /* If this is an in-class inline definition, we may have to pop the
10964 bindings for the template parameters that we added in
10965 maybe_begin_member_template_processing when start_function was
10967 if (inclass_inline)
10968 maybe_end_member_template_processing ();
10970 /* Leave the scope of the class. */
10972 pop_nested_class ();
10978 /* Let the error reporting routines know that we're outside a
10979 function. For a nested function, this value is used in
10980 cxx_pop_function_context and then reset via pop_function_context. */
10981 current_function_decl = NULL_TREE;
10986 /* Create the FUNCTION_DECL for a function definition.
10987 DECLSPECS and DECLARATOR are the parts of the declaration;
10988 they describe the return type and the name of the function,
10989 but twisted together in a fashion that parallels the syntax of C.
10991 This function creates a binding context for the function body
10992 as well as setting up the FUNCTION_DECL in current_function_decl.
10994 Returns a FUNCTION_DECL on success.
10996 If the DECLARATOR is not suitable for a function (it defines a datum
10997 instead), we return 0, which tells yyparse to report a parse error.
10999 May return void_type_node indicating that this method is actually
11000 a friend. See grokfield for more details.
11002 Came here with a `.pushlevel' .
11004 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
11005 CHANGES TO CODE IN `grokfield'. */
11008 start_method (cp_decl_specifier_seq *declspecs,
11009 const cp_declarator *declarator, tree attrlist)
11011 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
11014 if (fndecl == error_mark_node)
11015 return error_mark_node;
11017 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
11019 error ("invalid member function declaration");
11020 return error_mark_node;
11024 cplus_decl_attributes (&fndecl, attrlist, 0);
11026 /* Pass friends other than inline friend functions back. */
11027 if (fndecl == void_type_node)
11030 if (DECL_IN_AGGR_P (fndecl))
11032 if (DECL_CONTEXT (fndecl)
11033 && TREE_CODE( DECL_CONTEXT (fndecl)) != NAMESPACE_DECL)
11034 error ("%qD is already defined in class %qT", fndecl,
11035 DECL_CONTEXT (fndecl));
11036 return error_mark_node;
11039 check_template_shadow (fndecl);
11041 DECL_DECLARED_INLINE_P (fndecl) = 1;
11042 if (flag_default_inline)
11043 DECL_INLINE (fndecl) = 1;
11045 /* We process method specializations in finish_struct_1. */
11046 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
11048 fndecl = push_template_decl (fndecl);
11049 if (fndecl == error_mark_node)
11053 if (! DECL_FRIEND_P (fndecl))
11055 if (TREE_CHAIN (fndecl))
11057 fndecl = copy_node (fndecl);
11058 TREE_CHAIN (fndecl) = NULL_TREE;
11060 grok_special_member_properties (fndecl);
11063 cp_finish_decl (fndecl, NULL_TREE, NULL_TREE, 0);
11065 /* Make a place for the parms. */
11066 begin_scope (sk_function_parms, fndecl);
11068 DECL_IN_AGGR_P (fndecl) = 1;
11072 /* Go through the motions of finishing a function definition.
11073 We don't compile this method until after the whole class has
11076 FINISH_METHOD must return something that looks as though it
11077 came from GROKFIELD (since we are defining a method, after all).
11079 This is called after parsing the body of the function definition.
11080 STMTS is the chain of statements that makes up the function body.
11082 DECL is the ..._DECL that `start_method' provided. */
11085 finish_method (tree decl)
11087 tree fndecl = decl;
11092 if (decl == void_type_node)
11095 old_initial = DECL_INITIAL (fndecl);
11097 /* Undo the level for the parms (from start_method).
11098 This is like poplevel, but it causes nothing to be
11099 saved. Saving information here confuses symbol-table
11100 output routines. Besides, this information will
11101 be correctly output when this method is actually
11104 /* Clear out the meanings of the local variables of this level;
11105 also record in each decl which block it belongs to. */
11107 for (link = current_binding_level->names; link; link = TREE_CHAIN (link))
11109 if (DECL_NAME (link) != NULL_TREE)
11110 pop_binding (DECL_NAME (link), link);
11111 gcc_assert (TREE_CODE (link) != FUNCTION_DECL);
11112 DECL_CONTEXT (link) = NULL_TREE;
11115 poplevel (0, 0, 0);
11117 DECL_INITIAL (fndecl) = old_initial;
11119 /* We used to check if the context of FNDECL was different from
11120 current_class_type as another way to get inside here. This didn't work
11121 for String.cc in libg++. */
11122 if (DECL_FRIEND_P (fndecl))
11124 VEC_safe_push (tree, gc, CLASSTYPE_INLINE_FRIENDS (current_class_type),
11126 decl = void_type_node;
11133 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
11134 we can lay it out later, when and if its type becomes complete. */
11137 maybe_register_incomplete_var (tree var)
11139 gcc_assert (TREE_CODE (var) == VAR_DECL);
11141 /* Keep track of variables with incomplete types. */
11142 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
11143 && DECL_EXTERNAL (var))
11145 tree inner_type = TREE_TYPE (var);
11147 while (TREE_CODE (inner_type) == ARRAY_TYPE)
11148 inner_type = TREE_TYPE (inner_type);
11149 inner_type = TYPE_MAIN_VARIANT (inner_type);
11151 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
11152 /* RTTI TD entries are created while defining the type_info. */
11153 || (TYPE_LANG_SPECIFIC (inner_type)
11154 && TYPE_BEING_DEFINED (inner_type)))
11155 incomplete_vars = tree_cons (inner_type, var, incomplete_vars);
11159 /* Called when a class type (given by TYPE) is defined. If there are
11160 any existing VAR_DECLs whose type hsa been completed by this
11161 declaration, update them now. */
11164 complete_vars (tree type)
11166 tree *list = &incomplete_vars;
11168 gcc_assert (CLASS_TYPE_P (type));
11171 if (same_type_p (type, TREE_PURPOSE (*list)))
11173 tree var = TREE_VALUE (*list);
11174 tree type = TREE_TYPE (var);
11175 /* Complete the type of the variable. The VAR_DECL itself
11176 will be laid out in expand_expr. */
11177 complete_type (type);
11178 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
11179 /* Remove this entry from the list. */
11180 *list = TREE_CHAIN (*list);
11183 list = &TREE_CHAIN (*list);
11186 /* Check for pending declarations which may have abstract type. */
11187 complete_type_check_abstract (type);
11190 /* If DECL is of a type which needs a cleanup, build that cleanup
11194 cxx_maybe_build_cleanup (tree decl)
11196 tree type = TREE_TYPE (decl);
11198 if (type != error_mark_node && TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
11200 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
11202 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
11203 && CLASSTYPE_VBASECLASSES (type));
11205 if (TREE_CODE (type) == ARRAY_TYPE)
11209 cxx_mark_addressable (decl);
11210 rval = build_unary_op (ADDR_EXPR, decl, 0);
11213 /* Optimize for space over speed here. */
11214 if (!has_vbases || flag_expensive_optimizations)
11215 flags |= LOOKUP_NONVIRTUAL;
11217 rval = build_delete (TREE_TYPE (rval), rval,
11218 sfk_complete_destructor, flags, 0);
11225 /* When a stmt has been parsed, this function is called. */
11232 /* DECL was originally constructed as a non-static member function,
11233 but turned out to be static. Update it accordingly. */
11236 revert_static_member_fn (tree decl)
11239 tree function = TREE_TYPE (decl);
11240 tree args = TYPE_ARG_TYPES (function);
11242 if (cp_type_quals (TREE_TYPE (TREE_VALUE (args)))
11243 != TYPE_UNQUALIFIED)
11244 error ("static member function %q#D declared with type qualifiers", decl);
11246 args = TREE_CHAIN (args);
11247 tmp = build_function_type (TREE_TYPE (function), args);
11248 tmp = build_qualified_type (tmp, cp_type_quals (function));
11249 tmp = build_exception_variant (tmp,
11250 TYPE_RAISES_EXCEPTIONS (function));
11251 TREE_TYPE (decl) = tmp;
11252 if (DECL_ARGUMENTS (decl))
11253 DECL_ARGUMENTS (decl) = TREE_CHAIN (DECL_ARGUMENTS (decl));
11254 DECL_STATIC_FUNCTION_P (decl) = 1;
11257 /* Initialize the variables used during compilation of a C++
11261 cxx_push_function_context (struct function * f)
11263 struct language_function *p = GGC_CNEW (struct language_function);
11266 /* Whenever we start a new function, we destroy temporaries in the
11268 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
11274 if (DECL_SAVED_FUNCTION_DATA (fn))
11276 /* If we already parsed this function, and we're just expanding it
11277 now, restore saved state. */
11278 *cp_function_chain = *DECL_SAVED_FUNCTION_DATA (fn);
11280 /* We don't need the saved data anymore. Unless this is an inline
11281 function; we need the named return value info for
11282 declare_return_variable. */
11283 if (! DECL_INLINE (fn))
11284 DECL_SAVED_FUNCTION_DATA (fn) = NULL;
11289 /* Free the language-specific parts of F, now that we've finished
11290 compiling the function. */
11293 cxx_pop_function_context (struct function * f)
11298 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
11299 one of the language-independent trees. */
11301 enum cp_tree_node_structure_enum
11302 cp_tree_node_structure (union lang_tree_node * t)
11304 switch (TREE_CODE (&t->generic))
11306 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
11307 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
11308 case OVERLOAD: return TS_CP_OVERLOAD;
11309 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
11310 case TINST_LEVEL: return TS_CP_TINST_LEVEL;
11311 case PTRMEM_CST: return TS_CP_PTRMEM;
11312 case BASELINK: return TS_CP_BASELINK;
11313 default: return TS_CP_GENERIC;
11317 /* Build the void_list_node (void_type_node having been created). */
11319 build_void_list_node (void)
11321 tree t = build_tree_list (NULL_TREE, void_type_node);
11326 cp_missing_noreturn_ok_p (tree decl)
11328 /* A missing noreturn is ok for the `main' function. */
11329 return DECL_MAIN_P (decl);
11332 /* Return the COMDAT group into which DECL should be placed. */
11335 cxx_comdat_group (tree decl)
11339 /* Virtual tables, construction virtual tables, and virtual table
11340 tables all go in a single COMDAT group, named after the primary
11342 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
11343 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
11344 /* For all other DECLs, the COMDAT group is the mangled name of the
11345 declaration itself. */
11348 while (DECL_THUNK_P (decl))
11350 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
11351 into the same section as the target function. In that case
11352 we must return target's name. */
11353 tree target = THUNK_TARGET (decl);
11354 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
11355 && DECL_SECTION_NAME (target) != NULL
11356 && DECL_ONE_ONLY (target))
11361 name = DECL_ASSEMBLER_NAME (decl);
11364 return IDENTIFIER_POINTER (name);
11367 #include "gt-cp-decl.h"